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// SPDX-License-Identifier: GPL-2.0-only
/*
* ISHTP bus layer messages handling
*
* Copyright (c) 2003-2016, Intel Corporation.
*/
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include "ishtp-dev.h"
#include "hbm.h"
#include "client.h"
/**
* ishtp_hbm_fw_cl_allocate() - Allocate FW clients
* @dev: ISHTP device instance
*
* Allocates storage for fw clients
*/
static void ishtp_hbm_fw_cl_allocate(struct ishtp_device *dev)
{
struct ishtp_fw_client *clients;
int b;
/* count how many ISH clients we have */
for_each_set_bit(b, dev->fw_clients_map, ISHTP_CLIENTS_MAX)
dev->fw_clients_num++;
if (dev->fw_clients_num <= 0)
return;
/* allocate storage for fw clients representation */
clients = kcalloc(dev->fw_clients_num, sizeof(struct ishtp_fw_client),
GFP_KERNEL);
if (!clients) {
dev->dev_state = ISHTP_DEV_RESETTING;
ish_hw_reset(dev);
return;
}
dev->fw_clients = clients;
}
/**
* ishtp_hbm_cl_hdr() - construct client hbm header
* @cl: client
* @hbm_cmd: host bus message command
* @buf: buffer for cl header
* @len: buffer length
*
* Initialize HBM buffer
*/
static inline void ishtp_hbm_cl_hdr(struct ishtp_cl *cl, uint8_t hbm_cmd,
void *buf, size_t len)
{
struct ishtp_hbm_cl_cmd *cmd = buf;
memset(cmd, 0, len);
cmd->hbm_cmd = hbm_cmd;
cmd->host_addr = cl->host_client_id;
cmd->fw_addr = cl->fw_client_id;
}
/**
* ishtp_hbm_cl_addr_equal() - Compare client address
* @cl: client
* @buf: Client command buffer
*
* Compare client address with the address in command buffer
*
* Return: True if they have the same address
*/
static inline bool ishtp_hbm_cl_addr_equal(struct ishtp_cl *cl, void *buf)
{
struct ishtp_hbm_cl_cmd *cmd = buf;
return cl->host_client_id == cmd->host_addr &&
cl->fw_client_id == cmd->fw_addr;
}
/**
* ishtp_hbm_start_wait() - Wait for HBM start message
* @dev: ISHTP device instance
*
* Wait for HBM start message from firmware
*
* Return: 0 if HBM start is/was received else timeout error
*/
int ishtp_hbm_start_wait(struct ishtp_device *dev)
{
int ret;
if (dev->hbm_state > ISHTP_HBM_START)
return 0;
dev_dbg(dev->devc, "Going to wait for ishtp start. hbm_state=%08X\n",
dev->hbm_state);
ret = wait_event_interruptible_timeout(dev->wait_hbm_recvd_msg,
dev->hbm_state >= ISHTP_HBM_STARTED,
(ISHTP_INTEROP_TIMEOUT * HZ));
dev_dbg(dev->devc,
"Woke up from waiting for ishtp start. hbm_state=%08X\n",
dev->hbm_state);
if (ret <= 0 && (dev->hbm_state <= ISHTP_HBM_START)) {
dev->hbm_state = ISHTP_HBM_IDLE;
dev_err(dev->devc,
"waiting for ishtp start failed. ret=%d hbm_state=%08X\n",
ret, dev->hbm_state);
return -ETIMEDOUT;
}
return 0;
}
/**
* ishtp_hbm_start_req() - Send HBM start message
* @dev: ISHTP device instance
*
* Send HBM start message to firmware
*
* Return: 0 if success else error code
*/
int ishtp_hbm_start_req(struct ishtp_device *dev)
{
struct ishtp_msg_hdr hdr;
struct hbm_host_version_request start_req = { 0 };
ishtp_hbm_hdr(&hdr, sizeof(start_req));
/* host start message */
start_req.hbm_cmd = HOST_START_REQ_CMD;
start_req.host_version.major_version = HBM_MAJOR_VERSION;
start_req.host_version.minor_version = HBM_MINOR_VERSION;
/*
* (!) Response to HBM start may be so quick that this thread would get
* preempted BEFORE managing to set hbm_state = ISHTP_HBM_START.
* So set it at first, change back to ISHTP_HBM_IDLE upon failure
*/
dev->hbm_state = ISHTP_HBM_START;
if (ishtp_write_message(dev, &hdr, &start_req)) {
dev_err(dev->devc, "version message send failed\n");
dev->dev_state = ISHTP_DEV_RESETTING;
dev->hbm_state = ISHTP_HBM_IDLE;
ish_hw_reset(dev);
return -ENODEV;
}
return 0;
}
/**
* ishtp_hbm_enum_clients_req() - Send client enum req
* @dev: ISHTP device instance
*
* Send enumeration client request message
*
* Return: 0 if success else error code
*/
void ishtp_hbm_enum_clients_req(struct ishtp_device *dev)
{
struct ishtp_msg_hdr hdr;
struct hbm_host_enum_request enum_req = { 0 };
/* enumerate clients */
ishtp_hbm_hdr(&hdr, sizeof(enum_req));
enum_req.hbm_cmd = HOST_ENUM_REQ_CMD;
if (ishtp_write_message(dev, &hdr, &enum_req)) {
dev->dev_state = ISHTP_DEV_RESETTING;
dev_err(dev->devc, "enumeration request send failed\n");
ish_hw_reset(dev);
}
dev->hbm_state = ISHTP_HBM_ENUM_CLIENTS;
}
/**
* ishtp_hbm_prop_req() - Request property
* @dev: ISHTP device instance
*
* Request property for a single client
*
* Return: 0 if success else error code
*/
static int ishtp_hbm_prop_req(struct ishtp_device *dev)
{
struct ishtp_msg_hdr hdr;
struct hbm_props_request prop_req = { 0 };
unsigned long next_client_index;
uint8_t client_num;
client_num = dev->fw_client_presentation_num;
next_client_index = find_next_bit(dev->fw_clients_map,
ISHTP_CLIENTS_MAX, dev->fw_client_index);
/* We got all client properties */
if (next_client_index == ISHTP_CLIENTS_MAX) {
dev->hbm_state = ISHTP_HBM_WORKING;
dev->dev_state = ISHTP_DEV_ENABLED;
for (dev->fw_client_presentation_num = 1;
dev->fw_client_presentation_num < client_num + 1;
++dev->fw_client_presentation_num)
/* Add new client device */
ishtp_bus_new_client(dev);
return 0;
}
dev->fw_clients[client_num].client_id = next_client_index;
ishtp_hbm_hdr(&hdr, sizeof(prop_req));
prop_req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
prop_req.address = next_client_index;
if (ishtp_write_message(dev, &hdr, &prop_req)) {
dev->dev_state = ISHTP_DEV_RESETTING;
dev_err(dev->devc, "properties request send failed\n");
ish_hw_reset(dev);
return -EIO;
}
dev->fw_client_index = next_client_index;
return 0;
}
/**
* ishtp_hbm_stop_req() - Send HBM stop
* @dev: ISHTP device instance
*
* Send stop request message
*/
static void ishtp_hbm_stop_req(struct ishtp_device *dev)
{
struct ishtp_msg_hdr hdr;
struct hbm_host_stop_request stop_req = { 0 } ;
ishtp_hbm_hdr(&hdr, sizeof(stop_req));
stop_req.hbm_cmd = HOST_STOP_REQ_CMD;
stop_req.reason = DRIVER_STOP_REQUEST;
ishtp_write_message(dev, &hdr, &stop_req);
}
/**
* ishtp_hbm_cl_flow_control_req() - Send flow control request
* @dev: ISHTP device instance
* @cl: ISHTP client instance
*
* Send flow control request
*
* Return: 0 if success else error code
*/
int ishtp_hbm_cl_flow_control_req(struct ishtp_device *dev,
struct ishtp_cl *cl)
{
struct ishtp_msg_hdr hdr;
struct hbm_flow_control flow_ctrl;
const size_t len = sizeof(flow_ctrl);
int rv;
unsigned long flags;
spin_lock_irqsave(&cl->fc_spinlock, flags);
ishtp_hbm_hdr(&hdr, len);
ishtp_hbm_cl_hdr(cl, ISHTP_FLOW_CONTROL_CMD, &flow_ctrl, len);
/*
* Sync possible race when RB recycle and packet receive paths
* both try to send an out FC
*/
if (cl->out_flow_ctrl_creds) {
spin_unlock_irqrestore(&cl->fc_spinlock, flags);
return 0;
}
cl->recv_msg_num_frags = 0;
rv = ishtp_write_message(dev, &hdr, &flow_ctrl);
if (!rv) {
++cl->out_flow_ctrl_creds;
++cl->out_flow_ctrl_cnt;
cl->ts_out_fc = ktime_get();
if (cl->ts_rx) {
ktime_t ts_diff = ktime_sub(cl->ts_out_fc, cl->ts_rx);
if (ktime_after(ts_diff, cl->ts_max_fc_delay))
cl->ts_max_fc_delay = ts_diff;
}
} else {
++cl->err_send_fc;
}
spin_unlock_irqrestore(&cl->fc_spinlock, flags);
return rv;
}
/**
* ishtp_hbm_cl_disconnect_req() - Send disconnect request
* @dev: ISHTP device instance
* @cl: ISHTP client instance
*
* Send disconnect message to fw
*
* Return: 0 if success else error code
*/
int ishtp_hbm_cl_disconnect_req(struct ishtp_device *dev, struct ishtp_cl *cl)
{
struct ishtp_msg_hdr hdr;
struct hbm_client_connect_request disconn_req;
const size_t len = sizeof(disconn_req);
ishtp_hbm_hdr(&hdr, len);
ishtp_hbm_cl_hdr(cl, CLIENT_DISCONNECT_REQ_CMD, &disconn_req, len);
return ishtp_write_message(dev, &hdr, &disconn_req);
}
/**
* ishtp_hbm_cl_disconnect_res() - Get disconnect response
* @dev: ISHTP device instance
* @rs: Response message
*
* Received disconnect response from fw
*/
static void ishtp_hbm_cl_disconnect_res(struct ishtp_device *dev,
struct hbm_client_connect_response *rs)
{
struct ishtp_cl *cl = NULL;
unsigned long flags;
spin_lock_irqsave(&dev->cl_list_lock, flags);
list_for_each_entry(cl, &dev->cl_list, link) {
if (!rs->status && ishtp_hbm_cl_addr_equal(cl, rs)) {
cl->state = ISHTP_CL_DISCONNECTED;
wake_up_interruptible(&cl->wait_ctrl_res);
break;
}
}
spin_unlock_irqrestore(&dev->cl_list_lock, flags);
}
/**
* ishtp_hbm_cl_connect_req() - Send connect request
* @dev: ISHTP device instance
* @cl: client device instance
*
* Send connection request to specific fw client
*
* Return: 0 if success else error code
*/
int ishtp_hbm_cl_connect_req(struct ishtp_device *dev, struct ishtp_cl *cl)
{
struct ishtp_msg_hdr hdr;
struct hbm_client_connect_request conn_req;
const size_t len = sizeof(conn_req);
ishtp_hbm_hdr(&hdr, len);
ishtp_hbm_cl_hdr(cl, CLIENT_CONNECT_REQ_CMD, &conn_req, len);
return ishtp_write_message(dev, &hdr, &conn_req);
}
/**
* ishtp_hbm_cl_connect_res() - Get connect response
* @dev: ISHTP device instance
* @rs: Response message
*
* Received connect response from fw
*/
static void ishtp_hbm_cl_connect_res(struct ishtp_device *dev,
struct hbm_client_connect_response *rs)
{
struct ishtp_cl *cl = NULL;
unsigned long flags;
spin_lock_irqsave(&dev->cl_list_lock, flags);
list_for_each_entry(cl, &dev->cl_list, link) {
if (ishtp_hbm_cl_addr_equal(cl, rs)) {
if (!rs->status) {
cl->state = ISHTP_CL_CONNECTED;
cl->status = 0;
} else {
cl->state = ISHTP_CL_DISCONNECTED;
cl->status = -ENODEV;
}
wake_up_interruptible(&cl->wait_ctrl_res);
break;
}
}
spin_unlock_irqrestore(&dev->cl_list_lock, flags);
}
/**
* ishtp_hbm_fw_disconnect_req() - Receive disconnect request
* @dev: ISHTP device instance
* @disconnect_req: disconnect request structure
*
* Disconnect request bus message from the fw. Send disconnect response.
*/
static void ishtp_hbm_fw_disconnect_req(struct ishtp_device *dev,
struct hbm_client_connect_request *disconnect_req)
{
struct ishtp_cl *cl;
const size_t len = sizeof(struct hbm_client_connect_response);
unsigned long flags;
struct ishtp_msg_hdr hdr;
unsigned char data[4]; /* All HBM messages are 4 bytes */
spin_lock_irqsave(&dev->cl_list_lock, flags);
list_for_each_entry(cl, &dev->cl_list, link) {
if (ishtp_hbm_cl_addr_equal(cl, disconnect_req)) {
cl->state = ISHTP_CL_DISCONNECTED;
/* send disconnect response */
ishtp_hbm_hdr(&hdr, len);
ishtp_hbm_cl_hdr(cl, CLIENT_DISCONNECT_RES_CMD, data,
len);
ishtp_write_message(dev, &hdr, data);
break;
}
}
spin_unlock_irqrestore(&dev->cl_list_lock, flags);
}
/**
* ishtp_hbm_dma_xfer_ack() - Receive transfer ACK
* @dev: ISHTP device instance
* @dma_xfer: HBM transfer message
*
* Receive ack for ISHTP-over-DMA client message
*/
static void ishtp_hbm_dma_xfer_ack(struct ishtp_device *dev,
struct dma_xfer_hbm *dma_xfer)
{
void *msg;
uint64_t offs;
struct ishtp_msg_hdr *ishtp_hdr =
(struct ishtp_msg_hdr *)&dev->ishtp_msg_hdr;
unsigned int msg_offs;
struct ishtp_cl *cl;
for (msg_offs = 0; msg_offs < ishtp_hdr->length;
msg_offs += sizeof(struct dma_xfer_hbm)) {
offs = dma_xfer->msg_addr - dev->ishtp_host_dma_tx_buf_phys;
if (offs > dev->ishtp_host_dma_tx_buf_size) {
dev_err(dev->devc, "Bad DMA Tx ack message address\n");
return;
}
if (dma_xfer->msg_length >
dev->ishtp_host_dma_tx_buf_size - offs) {
dev_err(dev->devc, "Bad DMA Tx ack message size\n");
return;
}
/* logical address of the acked mem */
msg = (unsigned char *)dev->ishtp_host_dma_tx_buf + offs;
ishtp_cl_release_dma_acked_mem(dev, msg, dma_xfer->msg_length);
list_for_each_entry(cl, &dev->cl_list, link) {
if (cl->fw_client_id == dma_xfer->fw_client_id &&
cl->host_client_id == dma_xfer->host_client_id)
/*
* in case that a single ack may be sent
* over several dma transfers, and the last msg
* addr was inside the acked memory, but not in
* its start
*/
if (cl->last_dma_addr >=
(unsigned char *)msg &&
cl->last_dma_addr <
(unsigned char *)msg +
dma_xfer->msg_length) {
cl->last_dma_acked = 1;
if (!list_empty(&cl->tx_list.list) &&
cl->ishtp_flow_ctrl_creds) {
/*
* start sending the first msg
*/
ishtp_cl_send_msg(dev, cl);
}
}
}
++dma_xfer;
}
}
/**
* ishtp_hbm_dma_xfer() - Receive DMA transfer message
* @dev: ISHTP device instance
* @dma_xfer: HBM transfer message
*
* Receive ISHTP-over-DMA client message
*/
static void ishtp_hbm_dma_xfer(struct ishtp_device *dev,
struct dma_xfer_hbm *dma_xfer)
{
void *msg;
uint64_t offs;
struct ishtp_msg_hdr hdr;
struct ishtp_msg_hdr *ishtp_hdr =
(struct ishtp_msg_hdr *) &dev->ishtp_msg_hdr;
struct dma_xfer_hbm *prm = dma_xfer;
unsigned int msg_offs;
for (msg_offs = 0; msg_offs < ishtp_hdr->length;
msg_offs += sizeof(struct dma_xfer_hbm)) {
offs = dma_xfer->msg_addr - dev->ishtp_host_dma_rx_buf_phys;
if (offs > dev->ishtp_host_dma_rx_buf_size) {
dev_err(dev->devc, "Bad DMA Rx message address\n");
return;
}
if (dma_xfer->msg_length >
dev->ishtp_host_dma_rx_buf_size - offs) {
dev_err(dev->devc, "Bad DMA Rx message size\n");
return;
}
msg = dev->ishtp_host_dma_rx_buf + offs;
recv_ishtp_cl_msg_dma(dev, msg, dma_xfer);
dma_xfer->hbm = DMA_XFER_ACK; /* Prepare for response */
++dma_xfer;
}
/* Send DMA_XFER_ACK [...] */
ishtp_hbm_hdr(&hdr, ishtp_hdr->length);
ishtp_write_message(dev, &hdr, (unsigned char *)prm);
}
/**
* ishtp_hbm_dispatch() - HBM dispatch function
* @dev: ISHTP device instance
* @hdr: bus message
*
* Bottom half read routine after ISR to handle the read bus message cmd
* processing
*/
void ishtp_hbm_dispatch(struct ishtp_device *dev,
struct ishtp_bus_message *hdr)
{
struct ishtp_bus_message *ishtp_msg;
struct ishtp_fw_client *fw_client;
struct hbm_host_version_response *version_res;
struct hbm_client_connect_response *connect_res;
struct hbm_client_connect_response *disconnect_res;
struct hbm_client_connect_request *disconnect_req;
struct hbm_props_response *props_res;
struct hbm_host_enum_response *enum_res;
struct ishtp_msg_hdr ishtp_hdr;
struct dma_alloc_notify dma_alloc_notify;
struct dma_xfer_hbm *dma_xfer;
ishtp_msg = hdr;
switch (ishtp_msg->hbm_cmd) {
case HOST_START_RES_CMD:
version_res = (struct hbm_host_version_response *)ishtp_msg;
if (!version_res->host_version_supported) {
dev->version = version_res->fw_max_version;
dev->hbm_state = ISHTP_HBM_STOPPED;
ishtp_hbm_stop_req(dev);
return;
}
dev->version.major_version = HBM_MAJOR_VERSION;
dev->version.minor_version = HBM_MINOR_VERSION;
if (dev->dev_state == ISHTP_DEV_INIT_CLIENTS &&
dev->hbm_state == ISHTP_HBM_START) {
dev->hbm_state = ISHTP_HBM_STARTED;
ishtp_hbm_enum_clients_req(dev);
} else {
dev_err(dev->devc,
"reset: wrong host start response\n");
/* BUG: why do we arrive here? */
ish_hw_reset(dev);
return;
}
wake_up_interruptible(&dev->wait_hbm_recvd_msg);
break;
case CLIENT_CONNECT_RES_CMD:
connect_res = (struct hbm_client_connect_response *)ishtp_msg;
ishtp_hbm_cl_connect_res(dev, connect_res);
break;
case CLIENT_DISCONNECT_RES_CMD:
disconnect_res =
(struct hbm_client_connect_response *)ishtp_msg;
ishtp_hbm_cl_disconnect_res(dev, disconnect_res);
break;
case HOST_CLIENT_PROPERTIES_RES_CMD:
props_res = (struct hbm_props_response *)ishtp_msg;
fw_client = &dev->fw_clients[dev->fw_client_presentation_num];
if (props_res->status || !dev->fw_clients) {
dev_err(dev->devc,
"reset: properties response hbm wrong status\n");
ish_hw_reset(dev);
return;
}
if (fw_client->client_id != props_res->address) {
dev_err(dev->devc,
"reset: host properties response address mismatch [%02X %02X]\n",
fw_client->client_id, props_res->address);
ish_hw_reset(dev);
return;
}
if (dev->dev_state != ISHTP_DEV_INIT_CLIENTS ||
dev->hbm_state != ISHTP_HBM_CLIENT_PROPERTIES) {
dev_err(dev->devc,
"reset: unexpected properties response\n");
ish_hw_reset(dev);
return;
}
fw_client->props = props_res->client_properties;
dev->fw_client_index++;
dev->fw_client_presentation_num++;
/* request property for the next client */
ishtp_hbm_prop_req(dev);
if (dev->dev_state != ISHTP_DEV_ENABLED)
break;
if (!ishtp_use_dma_transfer())
break;
dev_dbg(dev->devc, "Requesting to use DMA\n");
ishtp_cl_alloc_dma_buf(dev);
if (dev->ishtp_host_dma_rx_buf) {
const size_t len = sizeof(dma_alloc_notify);
memset(&dma_alloc_notify, 0, sizeof(dma_alloc_notify));
dma_alloc_notify.hbm = DMA_BUFFER_ALLOC_NOTIFY;
dma_alloc_notify.buf_size =
dev->ishtp_host_dma_rx_buf_size;
dma_alloc_notify.buf_address =
dev->ishtp_host_dma_rx_buf_phys;
ishtp_hbm_hdr(&ishtp_hdr, len);
ishtp_write_message(dev, &ishtp_hdr,
(unsigned char *)&dma_alloc_notify);
}
break;
case HOST_ENUM_RES_CMD:
enum_res = (struct hbm_host_enum_response *) ishtp_msg;
memcpy(dev->fw_clients_map, enum_res->valid_addresses, 32);
if (dev->dev_state == ISHTP_DEV_INIT_CLIENTS &&
dev->hbm_state == ISHTP_HBM_ENUM_CLIENTS) {
dev->fw_client_presentation_num = 0;
dev->fw_client_index = 0;
ishtp_hbm_fw_cl_allocate(dev);
dev->hbm_state = ISHTP_HBM_CLIENT_PROPERTIES;
/* first property request */
ishtp_hbm_prop_req(dev);
} else {
dev_err(dev->devc,
"reset: unexpected enumeration response hbm\n");
ish_hw_reset(dev);
return;
}
break;
case HOST_STOP_RES_CMD:
if (dev->hbm_state != ISHTP_HBM_STOPPED)
dev_err(dev->devc, "unexpected stop response\n");
dev->dev_state = ISHTP_DEV_DISABLED;
dev_info(dev->devc, "reset: FW stop response\n");
ish_hw_reset(dev);
break;
case CLIENT_DISCONNECT_REQ_CMD:
/* search for client */
disconnect_req =
(struct hbm_client_connect_request *)ishtp_msg;
ishtp_hbm_fw_disconnect_req(dev, disconnect_req);
break;
case FW_STOP_REQ_CMD:
dev->hbm_state = ISHTP_HBM_STOPPED;
break;
case DMA_BUFFER_ALLOC_RESPONSE:
dev->ishtp_host_dma_enabled = 1;
break;
case DMA_XFER:
dma_xfer = (struct dma_xfer_hbm *)ishtp_msg;
if (!dev->ishtp_host_dma_enabled) {
dev_err(dev->devc,
"DMA XFER requested but DMA is not enabled\n");
break;
}
ishtp_hbm_dma_xfer(dev, dma_xfer);
break;
case DMA_XFER_ACK:
dma_xfer = (struct dma_xfer_hbm *)ishtp_msg;
if (!dev->ishtp_host_dma_enabled ||
!dev->ishtp_host_dma_tx_buf) {
dev_err(dev->devc,
"DMA XFER acked but DMA Tx is not enabled\n");
break;
}
ishtp_hbm_dma_xfer_ack(dev, dma_xfer);
break;
default:
dev_err(dev->devc, "unknown HBM: %u\n",
(unsigned int)ishtp_msg->hbm_cmd);
break;
}
}
/**
* bh_hbm_work_fn() - HBM work function
* @work: work struct
*
* Bottom half processing work function (instead of thread handler)
* for processing hbm messages
*/
void bh_hbm_work_fn(struct work_struct *work)
{
unsigned long flags;
struct ishtp_device *dev;
unsigned char hbm[IPC_PAYLOAD_SIZE];
dev = container_of(work, struct ishtp_device, bh_hbm_work);
spin_lock_irqsave(&dev->rd_msg_spinlock, flags);
if (dev->rd_msg_fifo_head != dev->rd_msg_fifo_tail) {
memcpy(hbm, dev->rd_msg_fifo + dev->rd_msg_fifo_head,
IPC_PAYLOAD_SIZE);
dev->rd_msg_fifo_head =
(dev->rd_msg_fifo_head + IPC_PAYLOAD_SIZE) %
(RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE);
spin_unlock_irqrestore(&dev->rd_msg_spinlock, flags);
ishtp_hbm_dispatch(dev, (struct ishtp_bus_message *)hbm);
} else {
spin_unlock_irqrestore(&dev->rd_msg_spinlock, flags);
}
}
/**
* recv_hbm() - Receive HBM message
* @dev: ISHTP device instance
* @ishtp_hdr: received bus message
*
* Receive and process ISHTP bus messages in ISR context. This will schedule
* work function to process message
*/
void recv_hbm(struct ishtp_device *dev, struct ishtp_msg_hdr *ishtp_hdr)
{
uint8_t rd_msg_buf[ISHTP_RD_MSG_BUF_SIZE];
struct ishtp_bus_message *ishtp_msg =
(struct ishtp_bus_message *)rd_msg_buf;
unsigned long flags;
dev->ops->ishtp_read(dev, rd_msg_buf, ishtp_hdr->length);
/* Flow control - handle in place */
if (ishtp_msg->hbm_cmd == ISHTP_FLOW_CONTROL_CMD) {
struct hbm_flow_control *flow_control =
(struct hbm_flow_control *)ishtp_msg;
struct ishtp_cl *cl = NULL;
unsigned long flags, tx_flags;
spin_lock_irqsave(&dev->cl_list_lock, flags);
list_for_each_entry(cl, &dev->cl_list, link) {
if (cl->host_client_id == flow_control->host_addr &&
cl->fw_client_id ==
flow_control->fw_addr) {
/*
* NOTE: It's valid only for counting
* flow-control implementation to receive a
* FC in the middle of sending. Meanwhile not
* supported
*/
if (cl->ishtp_flow_ctrl_creds)
dev_err(dev->devc,
"recv extra FC from FW client %u (host client %u) (FC count was %d)\n",
(unsigned int)cl->fw_client_id,
(unsigned int)cl->host_client_id,
cl->ishtp_flow_ctrl_creds);
else {
++cl->ishtp_flow_ctrl_creds;
++cl->ishtp_flow_ctrl_cnt;
cl->last_ipc_acked = 1;
spin_lock_irqsave(
&cl->tx_list_spinlock,
tx_flags);
if (!list_empty(&cl->tx_list.list)) {
/*
* start sending the first msg
* = the callback function
*/
spin_unlock_irqrestore(
&cl->tx_list_spinlock,
tx_flags);
ishtp_cl_send_msg(dev, cl);
} else {
spin_unlock_irqrestore(
&cl->tx_list_spinlock,
tx_flags);
}
}
break;
}
}
spin_unlock_irqrestore(&dev->cl_list_lock, flags);
goto eoi;
}
/*
* Some messages that are safe for ISR processing and important
* to be done "quickly" and in-order, go here
*/
if (ishtp_msg->hbm_cmd == CLIENT_CONNECT_RES_CMD ||
ishtp_msg->hbm_cmd == CLIENT_DISCONNECT_RES_CMD ||
ishtp_msg->hbm_cmd == CLIENT_DISCONNECT_REQ_CMD ||
ishtp_msg->hbm_cmd == DMA_XFER) {
ishtp_hbm_dispatch(dev, ishtp_msg);
goto eoi;
}
/*
* All other HBMs go here.
* We schedule HBMs for processing serially by using system wq,
* possibly there will be multiple HBMs scheduled at the same time.
*/
spin_lock_irqsave(&dev->rd_msg_spinlock, flags);
if ((dev->rd_msg_fifo_tail + IPC_PAYLOAD_SIZE) %
(RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE) ==
dev->rd_msg_fifo_head) {
spin_unlock_irqrestore(&dev->rd_msg_spinlock, flags);
dev_err(dev->devc, "BH buffer overflow, dropping HBM %u\n",
(unsigned int)ishtp_msg->hbm_cmd);
goto eoi;
}
memcpy(dev->rd_msg_fifo + dev->rd_msg_fifo_tail, ishtp_msg,
ishtp_hdr->length);
dev->rd_msg_fifo_tail = (dev->rd_msg_fifo_tail + IPC_PAYLOAD_SIZE) %
(RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE);
spin_unlock_irqrestore(&dev->rd_msg_spinlock, flags);
schedule_work(&dev->bh_hbm_work);
eoi:
return;
}
/**
* recv_fixed_cl_msg() - Receive fixed client message
* @dev: ISHTP device instance
* @ishtp_hdr: received bus message
*
* Receive and process ISHTP fixed client messages (address == 0)
* in ISR context
*/
void recv_fixed_cl_msg(struct ishtp_device *dev,
struct ishtp_msg_hdr *ishtp_hdr)
{
uint8_t rd_msg_buf[ISHTP_RD_MSG_BUF_SIZE];
dev->print_log(dev,
"%s() got fixed client msg from client #%d\n",
__func__, ishtp_hdr->fw_addr);
dev->ops->ishtp_read(dev, rd_msg_buf, ishtp_hdr->length);
if (ishtp_hdr->fw_addr == ISHTP_SYSTEM_STATE_CLIENT_ADDR) {
struct ish_system_states_header *msg_hdr =
(struct ish_system_states_header *)rd_msg_buf;
if (msg_hdr->cmd == SYSTEM_STATE_SUBSCRIBE)
ishtp_send_resume(dev);
/* if FW request arrived here, the system is not suspended */
else
dev_err(dev->devc, "unknown fixed client msg [%02X]\n",
msg_hdr->cmd);
}
}
/**
* fix_cl_hdr() - Initialize fixed client header
* @hdr: message header
* @length: length of message
* @cl_addr: Client address
*
* Initialize message header for fixed client
*/
static inline void fix_cl_hdr(struct ishtp_msg_hdr *hdr, size_t length,
uint8_t cl_addr)
{
hdr->host_addr = 0;
hdr->fw_addr = cl_addr;
hdr->length = length;
hdr->msg_complete = 1;
hdr->reserved = 0;
}
/*** Suspend and resume notification ***/
static uint32_t current_state;
static uint32_t supported_states = SUSPEND_STATE_BIT | CONNECTED_STANDBY_STATE_BIT;
/**
* ishtp_send_suspend() - Send suspend message to FW
* @dev: ISHTP device instance
*
* Send suspend message to FW. This is useful for system freeze (non S3) case
*/
void ishtp_send_suspend(struct ishtp_device *dev)
{
struct ishtp_msg_hdr ishtp_hdr;
struct ish_system_states_status state_status_msg;
const size_t len = sizeof(struct ish_system_states_status);
fix_cl_hdr(&ishtp_hdr, len, ISHTP_SYSTEM_STATE_CLIENT_ADDR);
memset(&state_status_msg, 0, len);
state_status_msg.hdr.cmd = SYSTEM_STATE_STATUS;
state_status_msg.supported_states = supported_states;
current_state |= (SUSPEND_STATE_BIT | CONNECTED_STANDBY_STATE_BIT);
dev->print_log(dev, "%s() sends SUSPEND notification\n", __func__);
state_status_msg.states_status = current_state;
ishtp_write_message(dev, &ishtp_hdr,
(unsigned char *)&state_status_msg);
}
EXPORT_SYMBOL(ishtp_send_suspend);
/**
* ishtp_send_resume() - Send resume message to FW
* @dev: ISHTP device instance
*
* Send resume message to FW. This is useful for system freeze (non S3) case
*/
void ishtp_send_resume(struct ishtp_device *dev)
{
struct ishtp_msg_hdr ishtp_hdr;
struct ish_system_states_status state_status_msg;
const size_t len = sizeof(struct ish_system_states_status);
fix_cl_hdr(&ishtp_hdr, len, ISHTP_SYSTEM_STATE_CLIENT_ADDR);
memset(&state_status_msg, 0, len);
state_status_msg.hdr.cmd = SYSTEM_STATE_STATUS;
state_status_msg.supported_states = supported_states;
current_state &= ~(CONNECTED_STANDBY_STATE_BIT | SUSPEND_STATE_BIT);
dev->print_log(dev, "%s() sends RESUME notification\n", __func__);
state_status_msg.states_status = current_state;
ishtp_write_message(dev, &ishtp_hdr,
(unsigned char *)&state_status_msg);
}
EXPORT_SYMBOL(ishtp_send_resume);
/**
* ishtp_query_subscribers() - Send query subscribers message
* @dev: ISHTP device instance
*
* Send message to query subscribers
*/
void ishtp_query_subscribers(struct ishtp_device *dev)
{
struct ishtp_msg_hdr ishtp_hdr;
struct ish_system_states_query_subscribers query_subscribers_msg;
const size_t len = sizeof(struct ish_system_states_query_subscribers);
fix_cl_hdr(&ishtp_hdr, len, ISHTP_SYSTEM_STATE_CLIENT_ADDR);
memset(&query_subscribers_msg, 0, len);
query_subscribers_msg.hdr.cmd = SYSTEM_STATE_QUERY_SUBSCRIBERS;
ishtp_write_message(dev, &ishtp_hdr,
(unsigned char *)&query_subscribers_msg);
}
| linux-master | drivers/hid/intel-ish-hid/ishtp/hbm.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* ISHTP bus driver
*
* Copyright (c) 2012-2016, Intel Corporation.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include "bus.h"
#include "ishtp-dev.h"
#include "client.h"
#include "hbm.h"
static int ishtp_use_dma;
module_param_named(ishtp_use_dma, ishtp_use_dma, int, 0600);
MODULE_PARM_DESC(ishtp_use_dma, "Use DMA to send messages");
#define to_ishtp_cl_driver(d) container_of(d, struct ishtp_cl_driver, driver)
#define to_ishtp_cl_device(d) container_of(d, struct ishtp_cl_device, dev)
static bool ishtp_device_ready;
/**
* ishtp_recv() - process ishtp message
* @dev: ishtp device
*
* If a message with valid header and size is received, then
* this function calls appropriate handler. The host or firmware
* address is zero, then they are host bus management message,
* otherwise they are message fo clients.
*/
void ishtp_recv(struct ishtp_device *dev)
{
uint32_t msg_hdr;
struct ishtp_msg_hdr *ishtp_hdr;
/* Read ISHTP header dword */
msg_hdr = dev->ops->ishtp_read_hdr(dev);
if (!msg_hdr)
return;
dev->ops->sync_fw_clock(dev);
ishtp_hdr = (struct ishtp_msg_hdr *)&msg_hdr;
dev->ishtp_msg_hdr = msg_hdr;
/* Sanity check: ISHTP frag. length in header */
if (ishtp_hdr->length > dev->mtu) {
dev_err(dev->devc,
"ISHTP hdr - bad length: %u; dropped [%08X]\n",
(unsigned int)ishtp_hdr->length, msg_hdr);
return;
}
/* ISHTP bus message */
if (!ishtp_hdr->host_addr && !ishtp_hdr->fw_addr)
recv_hbm(dev, ishtp_hdr);
/* ISHTP fixed-client message */
else if (!ishtp_hdr->host_addr)
recv_fixed_cl_msg(dev, ishtp_hdr);
else
/* ISHTP client message */
recv_ishtp_cl_msg(dev, ishtp_hdr);
}
EXPORT_SYMBOL(ishtp_recv);
/**
* ishtp_send_msg() - Send ishtp message
* @dev: ishtp device
* @hdr: Message header
* @msg: Message contents
* @ipc_send_compl: completion callback
* @ipc_send_compl_prm: completion callback parameter
*
* Send a multi fragment message via IPC. After sending the first fragment
* the completion callback is called to schedule transmit of next fragment.
*
* Return: This returns IPC send message status.
*/
int ishtp_send_msg(struct ishtp_device *dev, struct ishtp_msg_hdr *hdr,
void *msg, void(*ipc_send_compl)(void *),
void *ipc_send_compl_prm)
{
unsigned char ipc_msg[IPC_FULL_MSG_SIZE];
uint32_t drbl_val;
drbl_val = dev->ops->ipc_get_header(dev, hdr->length +
sizeof(struct ishtp_msg_hdr),
1);
memcpy(ipc_msg, &drbl_val, sizeof(uint32_t));
memcpy(ipc_msg + sizeof(uint32_t), hdr, sizeof(uint32_t));
memcpy(ipc_msg + 2 * sizeof(uint32_t), msg, hdr->length);
return dev->ops->write(dev, ipc_send_compl, ipc_send_compl_prm,
ipc_msg, 2 * sizeof(uint32_t) + hdr->length);
}
/**
* ishtp_write_message() - Send ishtp single fragment message
* @dev: ishtp device
* @hdr: Message header
* @buf: message data
*
* Send a single fragment message via IPC. This returns IPC send message
* status.
*
* Return: This returns IPC send message status.
*/
int ishtp_write_message(struct ishtp_device *dev, struct ishtp_msg_hdr *hdr,
void *buf)
{
return ishtp_send_msg(dev, hdr, buf, NULL, NULL);
}
/**
* ishtp_fw_cl_by_uuid() - locate index of fw client
* @dev: ishtp device
* @uuid: uuid of the client to search
*
* Search firmware client using UUID.
*
* Return: fw client index or -ENOENT if not found
*/
int ishtp_fw_cl_by_uuid(struct ishtp_device *dev, const guid_t *uuid)
{
unsigned int i;
for (i = 0; i < dev->fw_clients_num; ++i) {
if (guid_equal(uuid, &dev->fw_clients[i].props.protocol_name))
return i;
}
return -ENOENT;
}
EXPORT_SYMBOL(ishtp_fw_cl_by_uuid);
/**
* ishtp_fw_cl_get_client() - return client information to client
* @dev: the ishtp device structure
* @uuid: uuid of the client to search
*
* Search firmware client using UUID and reture related client information.
*
* Return: pointer of client information on success, NULL on failure.
*/
struct ishtp_fw_client *ishtp_fw_cl_get_client(struct ishtp_device *dev,
const guid_t *uuid)
{
int i;
unsigned long flags;
spin_lock_irqsave(&dev->fw_clients_lock, flags);
i = ishtp_fw_cl_by_uuid(dev, uuid);
spin_unlock_irqrestore(&dev->fw_clients_lock, flags);
if (i < 0 || dev->fw_clients[i].props.fixed_address)
return NULL;
return &dev->fw_clients[i];
}
EXPORT_SYMBOL(ishtp_fw_cl_get_client);
/**
* ishtp_get_fw_client_id() - Get fw client id
* @fw_client: firmware client used to fetch the ID
*
* This interface is used to reset HW get FW client id.
*
* Return: firmware client id.
*/
int ishtp_get_fw_client_id(struct ishtp_fw_client *fw_client)
{
return fw_client->client_id;
}
EXPORT_SYMBOL(ishtp_get_fw_client_id);
/**
* ishtp_fw_cl_by_id() - return index to fw_clients for client_id
* @dev: the ishtp device structure
* @client_id: fw client id to search
*
* Search firmware client using client id.
*
* Return: index on success, -ENOENT on failure.
*/
int ishtp_fw_cl_by_id(struct ishtp_device *dev, uint8_t client_id)
{
int i, res = -ENOENT;
unsigned long flags;
spin_lock_irqsave(&dev->fw_clients_lock, flags);
for (i = 0; i < dev->fw_clients_num; i++) {
if (dev->fw_clients[i].client_id == client_id) {
res = i;
break;
}
}
spin_unlock_irqrestore(&dev->fw_clients_lock, flags);
return res;
}
/**
* ishtp_cl_device_probe() - Bus probe() callback
* @dev: the device structure
*
* This is a bus probe callback and calls the drive probe function.
*
* Return: Return value from driver probe() call.
*/
static int ishtp_cl_device_probe(struct device *dev)
{
struct ishtp_cl_device *device = to_ishtp_cl_device(dev);
struct ishtp_cl_driver *driver;
if (!device)
return 0;
driver = to_ishtp_cl_driver(dev->driver);
if (!driver || !driver->probe)
return -ENODEV;
return driver->probe(device);
}
/**
* ishtp_cl_bus_match() - Bus match() callback
* @dev: the device structure
* @drv: the driver structure
*
* This is a bus match callback, called when a new ishtp_cl_device is
* registered during ishtp bus client enumeration. Use the guid_t in
* drv and dev to decide whether they match or not.
*
* Return: 1 if dev & drv matches, 0 otherwise.
*/
static int ishtp_cl_bus_match(struct device *dev, struct device_driver *drv)
{
struct ishtp_cl_device *device = to_ishtp_cl_device(dev);
struct ishtp_cl_driver *driver = to_ishtp_cl_driver(drv);
return(device->fw_client ? guid_equal(&driver->id[0].guid,
&device->fw_client->props.protocol_name) : 0);
}
/**
* ishtp_cl_device_remove() - Bus remove() callback
* @dev: the device structure
*
* This is a bus remove callback and calls the drive remove function.
* Since the ISH driver model supports only built in, this is
* primarily can be called during pci driver init failure.
*
* Return: Return value from driver remove() call.
*/
static void ishtp_cl_device_remove(struct device *dev)
{
struct ishtp_cl_device *device = to_ishtp_cl_device(dev);
struct ishtp_cl_driver *driver = to_ishtp_cl_driver(dev->driver);
if (device->event_cb) {
device->event_cb = NULL;
cancel_work_sync(&device->event_work);
}
if (driver->remove)
driver->remove(device);
}
/**
* ishtp_cl_device_suspend() - Bus suspend callback
* @dev: device
*
* Called during device suspend process.
*
* Return: Return value from driver suspend() call.
*/
static int ishtp_cl_device_suspend(struct device *dev)
{
struct ishtp_cl_device *device = to_ishtp_cl_device(dev);
struct ishtp_cl_driver *driver;
int ret = 0;
if (!device)
return 0;
driver = to_ishtp_cl_driver(dev->driver);
if (driver && driver->driver.pm) {
if (driver->driver.pm->suspend)
ret = driver->driver.pm->suspend(dev);
}
return ret;
}
/**
* ishtp_cl_device_resume() - Bus resume callback
* @dev: device
*
* Called during device resume process.
*
* Return: Return value from driver resume() call.
*/
static int ishtp_cl_device_resume(struct device *dev)
{
struct ishtp_cl_device *device = to_ishtp_cl_device(dev);
struct ishtp_cl_driver *driver;
int ret = 0;
if (!device)
return 0;
driver = to_ishtp_cl_driver(dev->driver);
if (driver && driver->driver.pm) {
if (driver->driver.pm->resume)
ret = driver->driver.pm->resume(dev);
}
return ret;
}
/**
* ishtp_cl_device_reset() - Reset callback
* @device: ishtp client device instance
*
* This is a callback when HW reset is done and the device need
* reinit.
*
* Return: Return value from driver reset() call.
*/
static int ishtp_cl_device_reset(struct ishtp_cl_device *device)
{
struct ishtp_cl_driver *driver;
int ret = 0;
device->event_cb = NULL;
cancel_work_sync(&device->event_work);
driver = to_ishtp_cl_driver(device->dev.driver);
if (driver && driver->reset)
ret = driver->reset(device);
return ret;
}
static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
char *buf)
{
int len;
len = snprintf(buf, PAGE_SIZE, ISHTP_MODULE_PREFIX "%s\n", dev_name(dev));
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
}
static DEVICE_ATTR_RO(modalias);
static struct attribute *ishtp_cl_dev_attrs[] = {
&dev_attr_modalias.attr,
NULL,
};
ATTRIBUTE_GROUPS(ishtp_cl_dev);
static int ishtp_cl_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
if (add_uevent_var(env, "MODALIAS=" ISHTP_MODULE_PREFIX "%s", dev_name(dev)))
return -ENOMEM;
return 0;
}
static const struct dev_pm_ops ishtp_cl_bus_dev_pm_ops = {
/* Suspend callbacks */
.suspend = ishtp_cl_device_suspend,
.resume = ishtp_cl_device_resume,
/* Hibernate callbacks */
.freeze = ishtp_cl_device_suspend,
.thaw = ishtp_cl_device_resume,
.restore = ishtp_cl_device_resume,
};
static struct bus_type ishtp_cl_bus_type = {
.name = "ishtp",
.dev_groups = ishtp_cl_dev_groups,
.probe = ishtp_cl_device_probe,
.match = ishtp_cl_bus_match,
.remove = ishtp_cl_device_remove,
.pm = &ishtp_cl_bus_dev_pm_ops,
.uevent = ishtp_cl_uevent,
};
static void ishtp_cl_dev_release(struct device *dev)
{
kfree(to_ishtp_cl_device(dev));
}
static const struct device_type ishtp_cl_device_type = {
.release = ishtp_cl_dev_release,
};
/**
* ishtp_bus_add_device() - Function to create device on bus
* @dev: ishtp device
* @uuid: uuid of the client
* @name: Name of the client
*
* Allocate ISHTP bus client device, attach it to uuid
* and register with ISHTP bus.
*
* Return: ishtp_cl_device pointer or NULL on failure
*/
static struct ishtp_cl_device *ishtp_bus_add_device(struct ishtp_device *dev,
guid_t uuid, char *name)
{
struct ishtp_cl_device *device;
int status;
unsigned long flags;
spin_lock_irqsave(&dev->device_list_lock, flags);
list_for_each_entry(device, &dev->device_list, device_link) {
if (!strcmp(name, dev_name(&device->dev))) {
device->fw_client = &dev->fw_clients[
dev->fw_client_presentation_num - 1];
spin_unlock_irqrestore(&dev->device_list_lock, flags);
ishtp_cl_device_reset(device);
return device;
}
}
spin_unlock_irqrestore(&dev->device_list_lock, flags);
device = kzalloc(sizeof(struct ishtp_cl_device), GFP_KERNEL);
if (!device)
return NULL;
device->dev.parent = dev->devc;
device->dev.bus = &ishtp_cl_bus_type;
device->dev.type = &ishtp_cl_device_type;
device->ishtp_dev = dev;
device->fw_client =
&dev->fw_clients[dev->fw_client_presentation_num - 1];
dev_set_name(&device->dev, "%s", name);
spin_lock_irqsave(&dev->device_list_lock, flags);
list_add_tail(&device->device_link, &dev->device_list);
spin_unlock_irqrestore(&dev->device_list_lock, flags);
status = device_register(&device->dev);
if (status) {
spin_lock_irqsave(&dev->device_list_lock, flags);
list_del(&device->device_link);
spin_unlock_irqrestore(&dev->device_list_lock, flags);
dev_err(dev->devc, "Failed to register ISHTP client device\n");
put_device(&device->dev);
return NULL;
}
ishtp_device_ready = true;
return device;
}
/**
* ishtp_bus_remove_device() - Function to relase device on bus
* @device: client device instance
*
* This is a counterpart of ishtp_bus_add_device.
* Device is unregistered.
* the device structure is freed in 'ishtp_cl_dev_release' function
* Called only during error in pci driver init path.
*/
static void ishtp_bus_remove_device(struct ishtp_cl_device *device)
{
device_unregister(&device->dev);
}
/**
* ishtp_cl_driver_register() - Client driver register
* @driver: the client driver instance
* @owner: Owner of this driver module
*
* Once a client driver is probed, it created a client
* instance and registers with the bus.
*
* Return: Return value of driver_register or -ENODEV if not ready
*/
int ishtp_cl_driver_register(struct ishtp_cl_driver *driver,
struct module *owner)
{
if (!ishtp_device_ready)
return -ENODEV;
driver->driver.name = driver->name;
driver->driver.owner = owner;
driver->driver.bus = &ishtp_cl_bus_type;
return driver_register(&driver->driver);
}
EXPORT_SYMBOL(ishtp_cl_driver_register);
/**
* ishtp_cl_driver_unregister() - Client driver unregister
* @driver: the client driver instance
*
* Unregister client during device removal process.
*/
void ishtp_cl_driver_unregister(struct ishtp_cl_driver *driver)
{
driver_unregister(&driver->driver);
}
EXPORT_SYMBOL(ishtp_cl_driver_unregister);
/**
* ishtp_bus_event_work() - event work function
* @work: work struct pointer
*
* Once an event is received for a client this work
* function is called. If the device has registered a
* callback then the callback is called.
*/
static void ishtp_bus_event_work(struct work_struct *work)
{
struct ishtp_cl_device *device;
device = container_of(work, struct ishtp_cl_device, event_work);
if (device->event_cb)
device->event_cb(device);
}
/**
* ishtp_cl_bus_rx_event() - schedule event work
* @device: client device instance
*
* Once an event is received for a client this schedules
* a work function to process.
*/
void ishtp_cl_bus_rx_event(struct ishtp_cl_device *device)
{
if (!device || !device->event_cb)
return;
if (device->event_cb)
schedule_work(&device->event_work);
}
/**
* ishtp_register_event_cb() - Register callback
* @device: client device instance
* @event_cb: Event processor for an client
*
* Register a callback for events, called from client driver
*
* Return: Return 0 or -EALREADY if already registered
*/
int ishtp_register_event_cb(struct ishtp_cl_device *device,
void (*event_cb)(struct ishtp_cl_device *))
{
if (device->event_cb)
return -EALREADY;
device->event_cb = event_cb;
INIT_WORK(&device->event_work, ishtp_bus_event_work);
return 0;
}
EXPORT_SYMBOL(ishtp_register_event_cb);
/**
* ishtp_get_device() - update usage count for the device
* @cl_device: client device instance
*
* Increment the usage count. The device can't be deleted
*/
void ishtp_get_device(struct ishtp_cl_device *cl_device)
{
cl_device->reference_count++;
}
EXPORT_SYMBOL(ishtp_get_device);
/**
* ishtp_put_device() - decrement usage count for the device
* @cl_device: client device instance
*
* Decrement the usage count. The device can be deleted is count = 0
*/
void ishtp_put_device(struct ishtp_cl_device *cl_device)
{
cl_device->reference_count--;
}
EXPORT_SYMBOL(ishtp_put_device);
/**
* ishtp_set_drvdata() - set client driver data
* @cl_device: client device instance
* @data: driver data need to be set
*
* Set client driver data to cl_device->driver_data.
*/
void ishtp_set_drvdata(struct ishtp_cl_device *cl_device, void *data)
{
cl_device->driver_data = data;
}
EXPORT_SYMBOL(ishtp_set_drvdata);
/**
* ishtp_get_drvdata() - get client driver data
* @cl_device: client device instance
*
* Get client driver data from cl_device->driver_data.
*
* Return: pointer of driver data
*/
void *ishtp_get_drvdata(struct ishtp_cl_device *cl_device)
{
return cl_device->driver_data;
}
EXPORT_SYMBOL(ishtp_get_drvdata);
/**
* ishtp_dev_to_cl_device() - get ishtp_cl_device instance from device instance
* @device: device instance
*
* Get ish_cl_device instance which embeds device instance in it.
*
* Return: pointer to ishtp_cl_device instance
*/
struct ishtp_cl_device *ishtp_dev_to_cl_device(struct device *device)
{
return to_ishtp_cl_device(device);
}
EXPORT_SYMBOL(ishtp_dev_to_cl_device);
/**
* ishtp_bus_new_client() - Create a new client
* @dev: ISHTP device instance
*
* Once bus protocol enumerates a client, this is called
* to add a device for the client.
*
* Return: 0 on success or error code on failure
*/
int ishtp_bus_new_client(struct ishtp_device *dev)
{
int i;
char *dev_name;
struct ishtp_cl_device *cl_device;
guid_t device_uuid;
/*
* For all reported clients, create an unconnected client and add its
* device to ISHTP bus.
* If appropriate driver has loaded, this will trigger its probe().
* Otherwise, probe() will be called when driver is loaded
*/
i = dev->fw_client_presentation_num - 1;
device_uuid = dev->fw_clients[i].props.protocol_name;
dev_name = kasprintf(GFP_KERNEL, "{%pUL}", &device_uuid);
if (!dev_name)
return -ENOMEM;
cl_device = ishtp_bus_add_device(dev, device_uuid, dev_name);
if (!cl_device) {
kfree(dev_name);
return -ENOENT;
}
kfree(dev_name);
return 0;
}
/**
* ishtp_cl_device_bind() - bind a device
* @cl: ishtp client device
*
* Binds connected ishtp_cl to ISHTP bus device
*
* Return: 0 on success or fault code
*/
int ishtp_cl_device_bind(struct ishtp_cl *cl)
{
struct ishtp_cl_device *cl_device;
unsigned long flags;
int rv;
if (!cl->fw_client_id || cl->state != ISHTP_CL_CONNECTED)
return -EFAULT;
rv = -ENOENT;
spin_lock_irqsave(&cl->dev->device_list_lock, flags);
list_for_each_entry(cl_device, &cl->dev->device_list,
device_link) {
if (cl_device->fw_client &&
cl_device->fw_client->client_id == cl->fw_client_id) {
cl->device = cl_device;
rv = 0;
break;
}
}
spin_unlock_irqrestore(&cl->dev->device_list_lock, flags);
return rv;
}
/**
* ishtp_bus_remove_all_clients() - Remove all clients
* @ishtp_dev: ishtp device
* @warm_reset: Reset due to FW reset dure to errors or S3 suspend
*
* This is part of reset/remove flow. This function the main processing
* only targets error processing, if the FW has forced reset or
* error to remove connected clients. When warm reset the client devices are
* not removed.
*/
void ishtp_bus_remove_all_clients(struct ishtp_device *ishtp_dev,
bool warm_reset)
{
struct ishtp_cl_device *cl_device, *n;
struct ishtp_cl *cl;
unsigned long flags;
spin_lock_irqsave(&ishtp_dev->cl_list_lock, flags);
list_for_each_entry(cl, &ishtp_dev->cl_list, link) {
cl->state = ISHTP_CL_DISCONNECTED;
/*
* Wake any pending process. The waiter would check dev->state
* and determine that it's not enabled already,
* and will return error to its caller
*/
wake_up_interruptible(&cl->wait_ctrl_res);
/* Disband any pending read/write requests and free rb */
ishtp_cl_flush_queues(cl);
/* Remove all free and in_process rings, both Rx and Tx */
ishtp_cl_free_rx_ring(cl);
ishtp_cl_free_tx_ring(cl);
/*
* Free client and ISHTP bus client device structures
* don't free host client because it is part of the OS fd
* structure
*/
}
spin_unlock_irqrestore(&ishtp_dev->cl_list_lock, flags);
/* Release DMA buffers for client messages */
ishtp_cl_free_dma_buf(ishtp_dev);
/* remove bus clients */
spin_lock_irqsave(&ishtp_dev->device_list_lock, flags);
list_for_each_entry_safe(cl_device, n, &ishtp_dev->device_list,
device_link) {
cl_device->fw_client = NULL;
if (warm_reset && cl_device->reference_count)
continue;
list_del(&cl_device->device_link);
spin_unlock_irqrestore(&ishtp_dev->device_list_lock, flags);
ishtp_bus_remove_device(cl_device);
spin_lock_irqsave(&ishtp_dev->device_list_lock, flags);
}
spin_unlock_irqrestore(&ishtp_dev->device_list_lock, flags);
/* Free all client structures */
spin_lock_irqsave(&ishtp_dev->fw_clients_lock, flags);
kfree(ishtp_dev->fw_clients);
ishtp_dev->fw_clients = NULL;
ishtp_dev->fw_clients_num = 0;
ishtp_dev->fw_client_presentation_num = 0;
ishtp_dev->fw_client_index = 0;
bitmap_zero(ishtp_dev->fw_clients_map, ISHTP_CLIENTS_MAX);
spin_unlock_irqrestore(&ishtp_dev->fw_clients_lock, flags);
}
EXPORT_SYMBOL(ishtp_bus_remove_all_clients);
/**
* ishtp_reset_handler() - IPC reset handler
* @dev: ishtp device
*
* ISHTP Handler for IPC_RESET notification
*/
void ishtp_reset_handler(struct ishtp_device *dev)
{
unsigned long flags;
/* Handle FW-initiated reset */
dev->dev_state = ISHTP_DEV_RESETTING;
/* Clear BH processing queue - no further HBMs */
spin_lock_irqsave(&dev->rd_msg_spinlock, flags);
dev->rd_msg_fifo_head = dev->rd_msg_fifo_tail = 0;
spin_unlock_irqrestore(&dev->rd_msg_spinlock, flags);
/* Handle ISH FW reset against upper layers */
ishtp_bus_remove_all_clients(dev, true);
}
EXPORT_SYMBOL(ishtp_reset_handler);
/**
* ishtp_reset_compl_handler() - Reset completion handler
* @dev: ishtp device
*
* ISHTP handler for IPC_RESET sequence completion to start
* host message bus start protocol sequence.
*/
void ishtp_reset_compl_handler(struct ishtp_device *dev)
{
dev->dev_state = ISHTP_DEV_INIT_CLIENTS;
dev->hbm_state = ISHTP_HBM_START;
ishtp_hbm_start_req(dev);
}
EXPORT_SYMBOL(ishtp_reset_compl_handler);
/**
* ishtp_use_dma_transfer() - Function to use DMA
*
* This interface is used to enable usage of DMA
*
* Return non zero if DMA can be enabled
*/
int ishtp_use_dma_transfer(void)
{
return ishtp_use_dma;
}
/**
* ishtp_device() - Return device pointer
* @device: ISH-TP client device instance
*
* This interface is used to return device pointer from ishtp_cl_device
* instance.
*
* Return: device *.
*/
struct device *ishtp_device(struct ishtp_cl_device *device)
{
return &device->dev;
}
EXPORT_SYMBOL(ishtp_device);
/**
* ishtp_wait_resume() - Wait for IPC resume
*
* Wait for IPC resume
*
* Return: resume complete or not
*/
bool ishtp_wait_resume(struct ishtp_device *dev)
{
/* 50ms to get resume response */
#define WAIT_FOR_RESUME_ACK_MS 50
/* Waiting to get resume response */
if (dev->resume_flag)
wait_event_interruptible_timeout(dev->resume_wait,
!dev->resume_flag,
msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
return (!dev->resume_flag);
}
EXPORT_SYMBOL_GPL(ishtp_wait_resume);
/**
* ishtp_get_pci_device() - Return PCI device dev pointer
* This interface is used to return PCI device pointer
* from ishtp_cl_device instance.
* @device: ISH-TP client device instance
*
* Return: device *.
*/
struct device *ishtp_get_pci_device(struct ishtp_cl_device *device)
{
return device->ishtp_dev->devc;
}
EXPORT_SYMBOL(ishtp_get_pci_device);
/**
* ishtp_trace_callback() - Return trace callback
* @cl_device: ISH-TP client device instance
*
* This interface is used to return trace callback function pointer.
*
* Return: *ishtp_print_log()
*/
ishtp_print_log ishtp_trace_callback(struct ishtp_cl_device *cl_device)
{
return cl_device->ishtp_dev->print_log;
}
EXPORT_SYMBOL(ishtp_trace_callback);
/**
* ish_hw_reset() - Call HW reset IPC callback
* @dev: ISHTP device instance
*
* This interface is used to reset HW in case of error.
*
* Return: value from IPC hw_reset callback
*/
int ish_hw_reset(struct ishtp_device *dev)
{
return dev->ops->hw_reset(dev);
}
EXPORT_SYMBOL(ish_hw_reset);
/**
* ishtp_bus_register() - Function to register bus
*
* This register ishtp bus
*
* Return: Return output of bus_register
*/
static int __init ishtp_bus_register(void)
{
return bus_register(&ishtp_cl_bus_type);
}
/**
* ishtp_bus_unregister() - Function to unregister bus
*
* This unregister ishtp bus
*/
static void __exit ishtp_bus_unregister(void)
{
bus_unregister(&ishtp_cl_bus_type);
}
module_init(ishtp_bus_register);
module_exit(ishtp_bus_unregister);
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/intel-ish-hid/ishtp/bus.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* ISHTP Ring Buffers
*
* Copyright (c) 2003-2016, Intel Corporation.
*/
#include <linux/slab.h>
#include "client.h"
/**
* ishtp_cl_alloc_rx_ring() - Allocate RX ring buffers
* @cl: client device instance
*
* Allocate and initialize RX ring buffers
*
* Return: 0 on success else -ENOMEM
*/
int ishtp_cl_alloc_rx_ring(struct ishtp_cl *cl)
{
size_t len = cl->device->fw_client->props.max_msg_length;
int j;
struct ishtp_cl_rb *rb;
int ret = 0;
unsigned long flags;
for (j = 0; j < cl->rx_ring_size; ++j) {
rb = ishtp_io_rb_init(cl);
if (!rb) {
ret = -ENOMEM;
goto out;
}
ret = ishtp_io_rb_alloc_buf(rb, len);
if (ret)
goto out;
spin_lock_irqsave(&cl->free_list_spinlock, flags);
list_add_tail(&rb->list, &cl->free_rb_list.list);
spin_unlock_irqrestore(&cl->free_list_spinlock, flags);
}
return 0;
out:
dev_err(&cl->device->dev, "error in allocating Rx buffers\n");
ishtp_cl_free_rx_ring(cl);
return ret;
}
/**
* ishtp_cl_alloc_tx_ring() - Allocate TX ring buffers
* @cl: client device instance
*
* Allocate and initialize TX ring buffers
*
* Return: 0 on success else -ENOMEM
*/
int ishtp_cl_alloc_tx_ring(struct ishtp_cl *cl)
{
size_t len = cl->device->fw_client->props.max_msg_length;
int j;
unsigned long flags;
cl->tx_ring_free_size = 0;
/* Allocate pool to free Tx bufs */
for (j = 0; j < cl->tx_ring_size; ++j) {
struct ishtp_cl_tx_ring *tx_buf;
tx_buf = kzalloc(sizeof(struct ishtp_cl_tx_ring), GFP_KERNEL);
if (!tx_buf)
goto out;
tx_buf->send_buf.data = kmalloc(len, GFP_KERNEL);
if (!tx_buf->send_buf.data) {
kfree(tx_buf);
goto out;
}
spin_lock_irqsave(&cl->tx_free_list_spinlock, flags);
list_add_tail(&tx_buf->list, &cl->tx_free_list.list);
++cl->tx_ring_free_size;
spin_unlock_irqrestore(&cl->tx_free_list_spinlock, flags);
}
return 0;
out:
dev_err(&cl->device->dev, "error in allocating Tx pool\n");
ishtp_cl_free_tx_ring(cl);
return -ENOMEM;
}
/**
* ishtp_cl_free_rx_ring() - Free RX ring buffers
* @cl: client device instance
*
* Free RX ring buffers
*/
void ishtp_cl_free_rx_ring(struct ishtp_cl *cl)
{
struct ishtp_cl_rb *rb;
unsigned long flags;
/* release allocated memory - pass over free_rb_list */
spin_lock_irqsave(&cl->free_list_spinlock, flags);
while (!list_empty(&cl->free_rb_list.list)) {
rb = list_entry(cl->free_rb_list.list.next, struct ishtp_cl_rb,
list);
list_del(&rb->list);
kfree(rb->buffer.data);
kfree(rb);
}
spin_unlock_irqrestore(&cl->free_list_spinlock, flags);
/* release allocated memory - pass over in_process_list */
spin_lock_irqsave(&cl->in_process_spinlock, flags);
while (!list_empty(&cl->in_process_list.list)) {
rb = list_entry(cl->in_process_list.list.next,
struct ishtp_cl_rb, list);
list_del(&rb->list);
kfree(rb->buffer.data);
kfree(rb);
}
spin_unlock_irqrestore(&cl->in_process_spinlock, flags);
}
/**
* ishtp_cl_free_tx_ring() - Free TX ring buffers
* @cl: client device instance
*
* Free TX ring buffers
*/
void ishtp_cl_free_tx_ring(struct ishtp_cl *cl)
{
struct ishtp_cl_tx_ring *tx_buf;
unsigned long flags;
spin_lock_irqsave(&cl->tx_free_list_spinlock, flags);
/* release allocated memory - pass over tx_free_list */
while (!list_empty(&cl->tx_free_list.list)) {
tx_buf = list_entry(cl->tx_free_list.list.next,
struct ishtp_cl_tx_ring, list);
list_del(&tx_buf->list);
--cl->tx_ring_free_size;
kfree(tx_buf->send_buf.data);
kfree(tx_buf);
}
spin_unlock_irqrestore(&cl->tx_free_list_spinlock, flags);
spin_lock_irqsave(&cl->tx_list_spinlock, flags);
/* release allocated memory - pass over tx_list */
while (!list_empty(&cl->tx_list.list)) {
tx_buf = list_entry(cl->tx_list.list.next,
struct ishtp_cl_tx_ring, list);
list_del(&tx_buf->list);
kfree(tx_buf->send_buf.data);
kfree(tx_buf);
}
spin_unlock_irqrestore(&cl->tx_list_spinlock, flags);
}
/**
* ishtp_io_rb_free() - Free IO request block
* @rb: IO request block
*
* Free io request block memory
*/
void ishtp_io_rb_free(struct ishtp_cl_rb *rb)
{
if (rb == NULL)
return;
kfree(rb->buffer.data);
kfree(rb);
}
/**
* ishtp_io_rb_init() - Allocate and init IO request block
* @cl: client device instance
*
* Allocate and initialize request block
*
* Return: Allocted IO request block pointer
*/
struct ishtp_cl_rb *ishtp_io_rb_init(struct ishtp_cl *cl)
{
struct ishtp_cl_rb *rb;
rb = kzalloc(sizeof(struct ishtp_cl_rb), GFP_KERNEL);
if (!rb)
return NULL;
INIT_LIST_HEAD(&rb->list);
rb->cl = cl;
rb->buf_idx = 0;
return rb;
}
/**
* ishtp_io_rb_alloc_buf() - Allocate and init response buffer
* @rb: IO request block
* @length: length of response buffer
*
* Allocate respose buffer
*
* Return: 0 on success else -ENOMEM
*/
int ishtp_io_rb_alloc_buf(struct ishtp_cl_rb *rb, size_t length)
{
if (!rb)
return -EINVAL;
if (length == 0)
return 0;
rb->buffer.data = kmalloc(length, GFP_KERNEL);
if (!rb->buffer.data)
return -ENOMEM;
rb->buffer.size = length;
return 0;
}
/**
* ishtp_cl_io_rb_recycle() - Recycle IO request blocks
* @rb: IO request block
*
* Re-append rb to its client's free list and send flow control if needed
*
* Return: 0 on success else -EFAULT
*/
int ishtp_cl_io_rb_recycle(struct ishtp_cl_rb *rb)
{
struct ishtp_cl *cl;
int rets = 0;
unsigned long flags;
if (!rb || !rb->cl)
return -EFAULT;
cl = rb->cl;
spin_lock_irqsave(&cl->free_list_spinlock, flags);
list_add_tail(&rb->list, &cl->free_rb_list.list);
spin_unlock_irqrestore(&cl->free_list_spinlock, flags);
/*
* If we returned the first buffer to empty 'free' list,
* send flow control
*/
if (!cl->out_flow_ctrl_creds)
rets = ishtp_cl_read_start(cl);
return rets;
}
EXPORT_SYMBOL(ishtp_cl_io_rb_recycle);
/**
* ishtp_cl_tx_empty() -test whether client device tx buffer is empty
* @cl: Pointer to client device instance
*
* Look client device tx buffer list, and check whether this list is empty
*
* Return: true if client tx buffer list is empty else false
*/
bool ishtp_cl_tx_empty(struct ishtp_cl *cl)
{
int tx_list_empty;
unsigned long tx_flags;
spin_lock_irqsave(&cl->tx_list_spinlock, tx_flags);
tx_list_empty = list_empty(&cl->tx_list.list);
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
return !!tx_list_empty;
}
EXPORT_SYMBOL(ishtp_cl_tx_empty);
/**
* ishtp_cl_rx_get_rb() -Get a rb from client device rx buffer list
* @cl: Pointer to client device instance
*
* Check client device in-processing buffer list and get a rb from it.
*
* Return: rb pointer if buffer list isn't empty else NULL
*/
struct ishtp_cl_rb *ishtp_cl_rx_get_rb(struct ishtp_cl *cl)
{
unsigned long rx_flags;
struct ishtp_cl_rb *rb;
spin_lock_irqsave(&cl->in_process_spinlock, rx_flags);
rb = list_first_entry_or_null(&cl->in_process_list.list,
struct ishtp_cl_rb, list);
if (rb)
list_del_init(&rb->list);
spin_unlock_irqrestore(&cl->in_process_spinlock, rx_flags);
return rb;
}
EXPORT_SYMBOL(ishtp_cl_rx_get_rb);
| linux-master | drivers/hid/intel-ish-hid/ishtp/client-buffers.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* PCI glue for ISHTP provider device (ISH) driver
*
* Copyright (c) 2014-2016, Intel Corporation.
*/
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/suspend.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#define CREATE_TRACE_POINTS
#include <trace/events/intel_ish.h>
#include "ishtp-dev.h"
#include "hw-ish.h"
static const struct pci_device_id ish_pci_tbl[] = {
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CHV_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Ax_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Bx_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, APL_Ax_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_Ax_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_Ax_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, GLK_Ax_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_H_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ICL_MOBILE_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_H_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CML_LP_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, CMP_H_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, EHL_Ax_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, TGL_LP_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, TGL_H_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_S_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_P_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_N_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, RPL_S_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MTL_P_DEVICE_ID)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, ARL_H_DEVICE_ID)},
{0, }
};
MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
/**
* ish_event_tracer() - Callback function to dump trace messages
* @dev: ishtp device
* @format: printf style format
*
* Callback to direct log messages to Linux trace buffers
*/
static __printf(2, 3)
void ish_event_tracer(struct ishtp_device *dev, const char *format, ...)
{
if (trace_ishtp_dump_enabled()) {
va_list args;
char tmp_buf[100];
va_start(args, format);
vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
va_end(args);
trace_ishtp_dump(tmp_buf);
}
}
/**
* ish_init() - Init function
* @dev: ishtp device
*
* This function initialize wait queues for suspend/resume and call
* calls hadware initialization function. This will initiate
* startup sequence
*
* Return: 0 for success or error code for failure
*/
static int ish_init(struct ishtp_device *dev)
{
int ret;
/* Set the state of ISH HW to start */
ret = ish_hw_start(dev);
if (ret) {
dev_err(dev->devc, "ISH: hw start failed.\n");
return ret;
}
/* Start the inter process communication to ISH processor */
ret = ishtp_start(dev);
if (ret) {
dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
return ret;
}
return 0;
}
static const struct pci_device_id ish_invalid_pci_ids[] = {
/* Mehlow platform special pci ids */
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA309)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA30A)},
{}
};
static inline bool ish_should_enter_d0i3(struct pci_dev *pdev)
{
return !pm_suspend_via_firmware() || pdev->device == CHV_DEVICE_ID;
}
static inline bool ish_should_leave_d0i3(struct pci_dev *pdev)
{
return !pm_resume_via_firmware() || pdev->device == CHV_DEVICE_ID;
}
static int enable_gpe(struct device *dev)
{
#ifdef CONFIG_ACPI
acpi_status acpi_sts;
struct acpi_device *adev;
struct acpi_device_wakeup *wakeup;
adev = ACPI_COMPANION(dev);
if (!adev) {
dev_err(dev, "get acpi handle failed\n");
return -ENODEV;
}
wakeup = &adev->wakeup;
acpi_sts = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
if (ACPI_FAILURE(acpi_sts)) {
dev_err(dev, "enable ose_gpe failed\n");
return -EIO;
}
return 0;
#else
return -ENODEV;
#endif
}
static void enable_pme_wake(struct pci_dev *pdev)
{
if ((pci_pme_capable(pdev, PCI_D0) ||
pci_pme_capable(pdev, PCI_D3hot) ||
pci_pme_capable(pdev, PCI_D3cold)) && !enable_gpe(&pdev->dev)) {
pci_pme_active(pdev, true);
dev_dbg(&pdev->dev, "ish ipc driver pme wake enabled\n");
}
}
/**
* ish_probe() - PCI driver probe callback
* @pdev: pci device
* @ent: pci device id
*
* Initialize PCI function, setup interrupt and call for ISH initialization
*
* Return: 0 for success or error code for failure
*/
static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int ret;
struct ish_hw *hw;
unsigned long irq_flag = 0;
struct ishtp_device *ishtp;
struct device *dev = &pdev->dev;
/* Check for invalid platforms for ISH support */
if (pci_dev_present(ish_invalid_pci_ids))
return -ENODEV;
/* enable pci dev */
ret = pcim_enable_device(pdev);
if (ret) {
dev_err(dev, "ISH: Failed to enable PCI device\n");
return ret;
}
/* set PCI host mastering */
pci_set_master(pdev);
/* pci request regions for ISH driver */
ret = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
if (ret) {
dev_err(dev, "ISH: Failed to get PCI regions\n");
return ret;
}
/* allocates and initializes the ISH dev structure */
ishtp = ish_dev_init(pdev);
if (!ishtp) {
ret = -ENOMEM;
return ret;
}
hw = to_ish_hw(ishtp);
ishtp->print_log = ish_event_tracer;
/* mapping IO device memory */
hw->mem_addr = pcim_iomap_table(pdev)[0];
ishtp->pdev = pdev;
/* request and enable interrupt */
ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
if (!pdev->msi_enabled && !pdev->msix_enabled)
irq_flag = IRQF_SHARED;
ret = devm_request_irq(dev, pdev->irq, ish_irq_handler,
irq_flag, KBUILD_MODNAME, ishtp);
if (ret) {
dev_err(dev, "ISH: request IRQ %d failed\n", pdev->irq);
return ret;
}
dev_set_drvdata(ishtp->devc, ishtp);
init_waitqueue_head(&ishtp->suspend_wait);
init_waitqueue_head(&ishtp->resume_wait);
/* Enable PME for EHL */
if (pdev->device == EHL_Ax_DEVICE_ID)
enable_pme_wake(pdev);
ret = ish_init(ishtp);
if (ret)
return ret;
return 0;
}
/**
* ish_remove() - PCI driver remove callback
* @pdev: pci device
*
* This function does cleanup of ISH on pci remove callback
*/
static void ish_remove(struct pci_dev *pdev)
{
struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
ishtp_bus_remove_all_clients(ishtp_dev, false);
ish_device_disable(ishtp_dev);
}
static struct device __maybe_unused *ish_resume_device;
/* 50ms to get resume response */
#define WAIT_FOR_RESUME_ACK_MS 50
/**
* ish_resume_handler() - Work function to complete resume
* @work: work struct
*
* The resume work function to complete resume function asynchronously.
* There are two resume paths, one where ISH is not powered off,
* in that case a simple resume message is enough, others we need
* a reset sequence.
*/
static void __maybe_unused ish_resume_handler(struct work_struct *work)
{
struct pci_dev *pdev = to_pci_dev(ish_resume_device);
struct ishtp_device *dev = pci_get_drvdata(pdev);
uint32_t fwsts = dev->ops->get_fw_status(dev);
if (ish_should_leave_d0i3(pdev) && !dev->suspend_flag
&& IPC_IS_ISH_ILUP(fwsts)) {
if (device_may_wakeup(&pdev->dev))
disable_irq_wake(pdev->irq);
ish_set_host_ready(dev);
ishtp_send_resume(dev);
/* Waiting to get resume response */
if (dev->resume_flag)
wait_event_interruptible_timeout(dev->resume_wait,
!dev->resume_flag,
msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
/*
* If the flag is not cleared, something is wrong with ISH FW.
* So on resume, need to go through init sequence again.
*/
if (dev->resume_flag)
ish_init(dev);
} else {
/*
* Resume from the D3, full reboot of ISH processor will happen,
* so need to go through init sequence again.
*/
ish_init(dev);
}
}
/**
* ish_suspend() - ISH suspend callback
* @device: device pointer
*
* ISH suspend callback
*
* Return: 0 to the pm core
*/
static int __maybe_unused ish_suspend(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct ishtp_device *dev = pci_get_drvdata(pdev);
if (ish_should_enter_d0i3(pdev)) {
/*
* If previous suspend hasn't been asnwered then ISH is likely
* dead, don't attempt nested notification
*/
if (dev->suspend_flag)
return 0;
dev->resume_flag = 0;
dev->suspend_flag = 1;
ishtp_send_suspend(dev);
/* 25 ms should be enough for live ISH to flush all IPC buf */
if (dev->suspend_flag)
wait_event_interruptible_timeout(dev->suspend_wait,
!dev->suspend_flag,
msecs_to_jiffies(25));
if (dev->suspend_flag) {
/*
* It looks like FW halt, clear the DMA bit, and put
* ISH into D3, and FW would reset on resume.
*/
ish_disable_dma(dev);
} else {
/*
* Save state so PCI core will keep the device at D0,
* the ISH would enter D0i3
*/
pci_save_state(pdev);
if (device_may_wakeup(&pdev->dev))
enable_irq_wake(pdev->irq);
}
} else {
/*
* Clear the DMA bit before putting ISH into D3,
* or ISH FW would reset automatically.
*/
ish_disable_dma(dev);
}
return 0;
}
static __maybe_unused DECLARE_WORK(resume_work, ish_resume_handler);
/**
* ish_resume() - ISH resume callback
* @device: device pointer
*
* ISH resume callback
*
* Return: 0 to the pm core
*/
static int __maybe_unused ish_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct ishtp_device *dev = pci_get_drvdata(pdev);
/* add this to finish power flow for EHL */
if (dev->pdev->device == EHL_Ax_DEVICE_ID) {
pci_set_power_state(pdev, PCI_D0);
enable_pme_wake(pdev);
dev_dbg(dev->devc, "set power state to D0 for ehl\n");
}
ish_resume_device = device;
dev->resume_flag = 1;
schedule_work(&resume_work);
return 0;
}
static SIMPLE_DEV_PM_OPS(ish_pm_ops, ish_suspend, ish_resume);
static struct pci_driver ish_driver = {
.name = KBUILD_MODNAME,
.id_table = ish_pci_tbl,
.probe = ish_probe,
.remove = ish_remove,
.driver.pm = &ish_pm_ops,
};
module_pci_driver(ish_driver);
/* Original author */
MODULE_AUTHOR("Daniel Drubin <[email protected]>");
/* Adoption to upstream Linux kernel */
MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>");
MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/intel-ish-hid/ipc/pci-ish.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* H/W layer of ISHTP provider device (ISH)
*
* Copyright (c) 2014-2016, Intel Corporation.
*/
#include <linux/devm-helpers.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include "client.h"
#include "hw-ish.h"
#include "hbm.h"
/* For FW reset flow */
static struct work_struct fw_reset_work;
static struct ishtp_device *ishtp_dev;
/**
* ish_reg_read() - Read register
* @dev: ISHTP device pointer
* @offset: Register offset
*
* Read 32 bit register at a given offset
*
* Return: Read register value
*/
static inline uint32_t ish_reg_read(const struct ishtp_device *dev,
unsigned long offset)
{
struct ish_hw *hw = to_ish_hw(dev);
return readl(hw->mem_addr + offset);
}
/**
* ish_reg_write() - Write register
* @dev: ISHTP device pointer
* @offset: Register offset
* @value: Value to write
*
* Writes 32 bit register at a give offset
*/
static inline void ish_reg_write(struct ishtp_device *dev,
unsigned long offset,
uint32_t value)
{
struct ish_hw *hw = to_ish_hw(dev);
writel(value, hw->mem_addr + offset);
}
/**
* _ish_read_fw_sts_reg() - Read FW status register
* @dev: ISHTP device pointer
*
* Read FW status register
*
* Return: Read register value
*/
static inline uint32_t _ish_read_fw_sts_reg(struct ishtp_device *dev)
{
return ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
}
/**
* check_generated_interrupt() - Check if ISH interrupt
* @dev: ISHTP device pointer
*
* Check if an interrupt was generated for ISH
*
* Return: Read true or false
*/
static bool check_generated_interrupt(struct ishtp_device *dev)
{
bool interrupt_generated = true;
uint32_t pisr_val = 0;
if (dev->pdev->device == CHV_DEVICE_ID) {
pisr_val = ish_reg_read(dev, IPC_REG_PISR_CHV_AB);
interrupt_generated =
IPC_INT_FROM_ISH_TO_HOST_CHV_AB(pisr_val);
} else {
pisr_val = ish_reg_read(dev, IPC_REG_PISR_BXT);
interrupt_generated = !!pisr_val;
/* only busy-clear bit is RW, others are RO */
if (pisr_val)
ish_reg_write(dev, IPC_REG_PISR_BXT, pisr_val);
}
return interrupt_generated;
}
/**
* ish_is_input_ready() - Check if FW ready for RX
* @dev: ISHTP device pointer
*
* Check if ISH FW is ready for receiving data
*
* Return: Read true or false
*/
static bool ish_is_input_ready(struct ishtp_device *dev)
{
uint32_t doorbell_val;
doorbell_val = ish_reg_read(dev, IPC_REG_HOST2ISH_DRBL);
return !IPC_IS_BUSY(doorbell_val);
}
/**
* set_host_ready() - Indicate host ready
* @dev: ISHTP device pointer
*
* Set host ready indication to FW
*/
static void set_host_ready(struct ishtp_device *dev)
{
if (dev->pdev->device == CHV_DEVICE_ID) {
if (dev->pdev->revision == REVISION_ID_CHT_A0 ||
(dev->pdev->revision & REVISION_ID_SI_MASK) ==
REVISION_ID_CHT_Ax_SI)
ish_reg_write(dev, IPC_REG_HOST_COMM, 0x81);
else if (dev->pdev->revision == REVISION_ID_CHT_B0 ||
(dev->pdev->revision & REVISION_ID_SI_MASK) ==
REVISION_ID_CHT_Bx_SI ||
(dev->pdev->revision & REVISION_ID_SI_MASK) ==
REVISION_ID_CHT_Kx_SI ||
(dev->pdev->revision & REVISION_ID_SI_MASK) ==
REVISION_ID_CHT_Dx_SI) {
uint32_t host_comm_val;
host_comm_val = ish_reg_read(dev, IPC_REG_HOST_COMM);
host_comm_val |= IPC_HOSTCOMM_INT_EN_BIT_CHV_AB | 0x81;
ish_reg_write(dev, IPC_REG_HOST_COMM, host_comm_val);
}
} else {
uint32_t host_pimr_val;
host_pimr_val = ish_reg_read(dev, IPC_REG_PIMR_BXT);
host_pimr_val |= IPC_PIMR_INT_EN_BIT_BXT;
/*
* disable interrupt generated instead of
* RX_complete_msg
*/
host_pimr_val &= ~IPC_HOST2ISH_BUSYCLEAR_MASK_BIT;
ish_reg_write(dev, IPC_REG_PIMR_BXT, host_pimr_val);
}
}
/**
* ishtp_fw_is_ready() - Check if FW ready
* @dev: ISHTP device pointer
*
* Check if ISH FW is ready
*
* Return: Read true or false
*/
static bool ishtp_fw_is_ready(struct ishtp_device *dev)
{
uint32_t ish_status = _ish_read_fw_sts_reg(dev);
return IPC_IS_ISH_ILUP(ish_status) &&
IPC_IS_ISH_ISHTP_READY(ish_status);
}
/**
* ish_set_host_rdy() - Indicate host ready
* @dev: ISHTP device pointer
*
* Set host ready indication to FW
*/
static void ish_set_host_rdy(struct ishtp_device *dev)
{
uint32_t host_status = ish_reg_read(dev, IPC_REG_HOST_COMM);
IPC_SET_HOST_READY(host_status);
ish_reg_write(dev, IPC_REG_HOST_COMM, host_status);
}
/**
* ish_clr_host_rdy() - Indicate host not ready
* @dev: ISHTP device pointer
*
* Send host not ready indication to FW
*/
static void ish_clr_host_rdy(struct ishtp_device *dev)
{
uint32_t host_status = ish_reg_read(dev, IPC_REG_HOST_COMM);
IPC_CLEAR_HOST_READY(host_status);
ish_reg_write(dev, IPC_REG_HOST_COMM, host_status);
}
static bool ish_chk_host_rdy(struct ishtp_device *dev)
{
uint32_t host_status = ish_reg_read(dev, IPC_REG_HOST_COMM);
return (host_status & IPC_HOSTCOMM_READY_BIT);
}
/**
* ish_set_host_ready() - reconfig ipc host registers
* @dev: ishtp device pointer
*
* Set host to ready state
* This API is called in some case:
* fw is still on, but ipc is powered down.
* such as OOB case.
*
* Return: 0 for success else error fault code
*/
void ish_set_host_ready(struct ishtp_device *dev)
{
if (ish_chk_host_rdy(dev))
return;
ish_set_host_rdy(dev);
set_host_ready(dev);
}
/**
* _ishtp_read_hdr() - Read message header
* @dev: ISHTP device pointer
*
* Read header of 32bit length
*
* Return: Read register value
*/
static uint32_t _ishtp_read_hdr(const struct ishtp_device *dev)
{
return ish_reg_read(dev, IPC_REG_ISH2HOST_MSG);
}
/**
* _ishtp_read - Read message
* @dev: ISHTP device pointer
* @buffer: message buffer
* @buffer_length: length of message buffer
*
* Read message from FW
*
* Return: Always 0
*/
static int _ishtp_read(struct ishtp_device *dev, unsigned char *buffer,
unsigned long buffer_length)
{
uint32_t i;
uint32_t *r_buf = (uint32_t *)buffer;
uint32_t msg_offs;
msg_offs = IPC_REG_ISH2HOST_MSG + sizeof(struct ishtp_msg_hdr);
for (i = 0; i < buffer_length; i += sizeof(uint32_t))
*r_buf++ = ish_reg_read(dev, msg_offs + i);
return 0;
}
/**
* write_ipc_from_queue() - try to write ipc msg from Tx queue to device
* @dev: ishtp device pointer
*
* Check if DRBL is cleared. if it is - write the first IPC msg, then call
* the callback function (unless it's NULL)
*
* Return: 0 for success else failure code
*/
static int write_ipc_from_queue(struct ishtp_device *dev)
{
struct wr_msg_ctl_info *ipc_link;
unsigned long length;
unsigned long rem;
unsigned long flags;
uint32_t doorbell_val;
uint32_t *r_buf;
uint32_t reg_addr;
int i;
void (*ipc_send_compl)(void *);
void *ipc_send_compl_prm;
if (dev->dev_state == ISHTP_DEV_DISABLED)
return -EINVAL;
spin_lock_irqsave(&dev->wr_processing_spinlock, flags);
if (!ish_is_input_ready(dev)) {
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
return -EBUSY;
}
/*
* if tx send list is empty - return 0;
* may happen, as RX_COMPLETE handler doesn't check list emptiness.
*/
if (list_empty(&dev->wr_processing_list)) {
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
return 0;
}
ipc_link = list_first_entry(&dev->wr_processing_list,
struct wr_msg_ctl_info, link);
/* first 4 bytes of the data is the doorbell value (IPC header) */
length = ipc_link->length - sizeof(uint32_t);
doorbell_val = *(uint32_t *)ipc_link->inline_data;
r_buf = (uint32_t *)(ipc_link->inline_data + sizeof(uint32_t));
/* If sending MNG_SYNC_FW_CLOCK, update clock again */
if (IPC_HEADER_GET_PROTOCOL(doorbell_val) == IPC_PROTOCOL_MNG &&
IPC_HEADER_GET_MNG_CMD(doorbell_val) == MNG_SYNC_FW_CLOCK) {
uint64_t usec_system, usec_utc;
struct ipc_time_update_msg time_update;
struct time_sync_format ts_format;
usec_system = ktime_to_us(ktime_get_boottime());
usec_utc = ktime_to_us(ktime_get_real());
ts_format.ts1_source = HOST_SYSTEM_TIME_USEC;
ts_format.ts2_source = HOST_UTC_TIME_USEC;
ts_format.reserved = 0;
time_update.primary_host_time = usec_system;
time_update.secondary_host_time = usec_utc;
time_update.sync_info = ts_format;
memcpy(r_buf, &time_update,
sizeof(struct ipc_time_update_msg));
}
for (i = 0, reg_addr = IPC_REG_HOST2ISH_MSG; i < length >> 2; i++,
reg_addr += 4)
ish_reg_write(dev, reg_addr, r_buf[i]);
rem = length & 0x3;
if (rem > 0) {
uint32_t reg = 0;
memcpy(®, &r_buf[length >> 2], rem);
ish_reg_write(dev, reg_addr, reg);
}
ish_reg_write(dev, IPC_REG_HOST2ISH_DRBL, doorbell_val);
/* Flush writes to msg registers and doorbell */
ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
/* Update IPC counters */
++dev->ipc_tx_cnt;
dev->ipc_tx_bytes_cnt += IPC_HEADER_GET_LENGTH(doorbell_val);
ipc_send_compl = ipc_link->ipc_send_compl;
ipc_send_compl_prm = ipc_link->ipc_send_compl_prm;
list_del_init(&ipc_link->link);
list_add(&ipc_link->link, &dev->wr_free_list);
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
/*
* callback will be called out of spinlock,
* after ipc_link returned to free list
*/
if (ipc_send_compl)
ipc_send_compl(ipc_send_compl_prm);
return 0;
}
/**
* write_ipc_to_queue() - write ipc msg to Tx queue
* @dev: ishtp device instance
* @ipc_send_compl: Send complete callback
* @ipc_send_compl_prm: Parameter to send in complete callback
* @msg: Pointer to message
* @length: Length of message
*
* Recived msg with IPC (and upper protocol) header and add it to the device
* Tx-to-write list then try to send the first IPC waiting msg
* (if DRBL is cleared)
* This function returns negative value for failure (means free list
* is empty, or msg too long) and 0 for success.
*
* Return: 0 for success else failure code
*/
static int write_ipc_to_queue(struct ishtp_device *dev,
void (*ipc_send_compl)(void *), void *ipc_send_compl_prm,
unsigned char *msg, int length)
{
struct wr_msg_ctl_info *ipc_link;
unsigned long flags;
if (length > IPC_FULL_MSG_SIZE)
return -EMSGSIZE;
spin_lock_irqsave(&dev->wr_processing_spinlock, flags);
if (list_empty(&dev->wr_free_list)) {
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
return -ENOMEM;
}
ipc_link = list_first_entry(&dev->wr_free_list,
struct wr_msg_ctl_info, link);
list_del_init(&ipc_link->link);
ipc_link->ipc_send_compl = ipc_send_compl;
ipc_link->ipc_send_compl_prm = ipc_send_compl_prm;
ipc_link->length = length;
memcpy(ipc_link->inline_data, msg, length);
list_add_tail(&ipc_link->link, &dev->wr_processing_list);
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
write_ipc_from_queue(dev);
return 0;
}
/**
* ipc_send_mng_msg() - Send management message
* @dev: ishtp device instance
* @msg_code: Message code
* @msg: Pointer to message
* @size: Length of message
*
* Send management message to FW
*
* Return: 0 for success else failure code
*/
static int ipc_send_mng_msg(struct ishtp_device *dev, uint32_t msg_code,
void *msg, size_t size)
{
unsigned char ipc_msg[IPC_FULL_MSG_SIZE];
uint32_t drbl_val = IPC_BUILD_MNG_MSG(msg_code, size);
memcpy(ipc_msg, &drbl_val, sizeof(uint32_t));
memcpy(ipc_msg + sizeof(uint32_t), msg, size);
return write_ipc_to_queue(dev, NULL, NULL, ipc_msg,
sizeof(uint32_t) + size);
}
#define WAIT_FOR_FW_RDY 0x1
#define WAIT_FOR_INPUT_RDY 0x2
/**
* timed_wait_for_timeout() - wait special event with timeout
* @dev: ISHTP device pointer
* @condition: indicate the condition for waiting
* @timeinc: time slice for every wait cycle, in ms
* @timeout: time in ms for timeout
*
* This function will check special event to be ready in a loop, the loop
* period is specificd in timeinc. Wait timeout will causes failure.
*
* Return: 0 for success else failure code
*/
static int timed_wait_for_timeout(struct ishtp_device *dev, int condition,
unsigned int timeinc, unsigned int timeout)
{
bool complete = false;
int ret;
do {
if (condition == WAIT_FOR_FW_RDY) {
complete = ishtp_fw_is_ready(dev);
} else if (condition == WAIT_FOR_INPUT_RDY) {
complete = ish_is_input_ready(dev);
} else {
ret = -EINVAL;
goto out;
}
if (!complete) {
unsigned long left_time;
left_time = msleep_interruptible(timeinc);
timeout -= (timeinc - left_time);
}
} while (!complete && timeout > 0);
if (complete)
ret = 0;
else
ret = -EBUSY;
out:
return ret;
}
#define TIME_SLICE_FOR_FW_RDY_MS 100
#define TIME_SLICE_FOR_INPUT_RDY_MS 100
#define TIMEOUT_FOR_FW_RDY_MS 2000
#define TIMEOUT_FOR_INPUT_RDY_MS 2000
/**
* ish_fw_reset_handler() - FW reset handler
* @dev: ishtp device pointer
*
* Handle FW reset
*
* Return: 0 for success else failure code
*/
static int ish_fw_reset_handler(struct ishtp_device *dev)
{
uint32_t reset_id;
unsigned long flags;
/* Read reset ID */
reset_id = ish_reg_read(dev, IPC_REG_ISH2HOST_MSG) & 0xFFFF;
/* Clear IPC output queue */
spin_lock_irqsave(&dev->wr_processing_spinlock, flags);
list_splice_init(&dev->wr_processing_list, &dev->wr_free_list);
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
/* ISHTP notification in IPC_RESET */
ishtp_reset_handler(dev);
if (!ish_is_input_ready(dev))
timed_wait_for_timeout(dev, WAIT_FOR_INPUT_RDY,
TIME_SLICE_FOR_INPUT_RDY_MS, TIMEOUT_FOR_INPUT_RDY_MS);
/* ISH FW is dead */
if (!ish_is_input_ready(dev))
return -EPIPE;
/*
* Set HOST2ISH.ILUP. Apparently we need this BEFORE sending
* RESET_NOTIFY_ACK - FW will be checking for it
*/
ish_set_host_rdy(dev);
/* Send RESET_NOTIFY_ACK (with reset_id) */
ipc_send_mng_msg(dev, MNG_RESET_NOTIFY_ACK, &reset_id,
sizeof(uint32_t));
/* Wait for ISH FW'es ILUP and ISHTP_READY */
timed_wait_for_timeout(dev, WAIT_FOR_FW_RDY,
TIME_SLICE_FOR_FW_RDY_MS, TIMEOUT_FOR_FW_RDY_MS);
if (!ishtp_fw_is_ready(dev)) {
/* ISH FW is dead */
uint32_t ish_status;
ish_status = _ish_read_fw_sts_reg(dev);
dev_err(dev->devc,
"[ishtp-ish]: completed reset, ISH is dead (FWSTS = %08X)\n",
ish_status);
return -ENODEV;
}
return 0;
}
#define TIMEOUT_FOR_HW_RDY_MS 300
/**
* fw_reset_work_fn() - FW reset worker function
* @unused: not used
*
* Call ish_fw_reset_handler to complete FW reset
*/
static void fw_reset_work_fn(struct work_struct *unused)
{
int rv;
rv = ish_fw_reset_handler(ishtp_dev);
if (!rv) {
/* ISH is ILUP & ISHTP-ready. Restart ISHTP */
msleep_interruptible(TIMEOUT_FOR_HW_RDY_MS);
ishtp_dev->recvd_hw_ready = 1;
wake_up_interruptible(&ishtp_dev->wait_hw_ready);
/* ISHTP notification in IPC_RESET sequence completion */
ishtp_reset_compl_handler(ishtp_dev);
} else
dev_err(ishtp_dev->devc, "[ishtp-ish]: FW reset failed (%d)\n",
rv);
}
/**
* _ish_sync_fw_clock() -Sync FW clock with the OS clock
* @dev: ishtp device pointer
*
* Sync FW and OS time
*/
static void _ish_sync_fw_clock(struct ishtp_device *dev)
{
static unsigned long prev_sync;
uint64_t usec;
if (prev_sync && time_before(jiffies, prev_sync + 20 * HZ))
return;
prev_sync = jiffies;
usec = ktime_to_us(ktime_get_boottime());
ipc_send_mng_msg(dev, MNG_SYNC_FW_CLOCK, &usec, sizeof(uint64_t));
}
/**
* recv_ipc() - Receive and process IPC management messages
* @dev: ishtp device instance
* @doorbell_val: doorbell value
*
* This function runs in ISR context.
* NOTE: Any other mng command than reset_notify and reset_notify_ack
* won't wake BH handler
*/
static void recv_ipc(struct ishtp_device *dev, uint32_t doorbell_val)
{
uint32_t mng_cmd;
mng_cmd = IPC_HEADER_GET_MNG_CMD(doorbell_val);
switch (mng_cmd) {
default:
break;
case MNG_RX_CMPL_INDICATION:
if (dev->suspend_flag) {
dev->suspend_flag = 0;
wake_up_interruptible(&dev->suspend_wait);
}
if (dev->resume_flag) {
dev->resume_flag = 0;
wake_up_interruptible(&dev->resume_wait);
}
write_ipc_from_queue(dev);
break;
case MNG_RESET_NOTIFY:
if (!ishtp_dev) {
ishtp_dev = dev;
}
schedule_work(&fw_reset_work);
break;
case MNG_RESET_NOTIFY_ACK:
dev->recvd_hw_ready = 1;
wake_up_interruptible(&dev->wait_hw_ready);
break;
}
}
/**
* ish_irq_handler() - ISH IRQ handler
* @irq: irq number
* @dev_id: ishtp device pointer
*
* ISH IRQ handler. If interrupt is generated and is for ISH it will process
* the interrupt.
*/
irqreturn_t ish_irq_handler(int irq, void *dev_id)
{
struct ishtp_device *dev = dev_id;
uint32_t doorbell_val;
bool interrupt_generated;
/* Check that it's interrupt from ISH (may be shared) */
interrupt_generated = check_generated_interrupt(dev);
if (!interrupt_generated)
return IRQ_NONE;
doorbell_val = ish_reg_read(dev, IPC_REG_ISH2HOST_DRBL);
if (!IPC_IS_BUSY(doorbell_val))
return IRQ_HANDLED;
if (dev->dev_state == ISHTP_DEV_DISABLED)
return IRQ_HANDLED;
/* Sanity check: IPC dgram length in header */
if (IPC_HEADER_GET_LENGTH(doorbell_val) > IPC_PAYLOAD_SIZE) {
dev_err(dev->devc,
"IPC hdr - bad length: %u; dropped\n",
(unsigned int)IPC_HEADER_GET_LENGTH(doorbell_val));
goto eoi;
}
switch (IPC_HEADER_GET_PROTOCOL(doorbell_val)) {
default:
break;
case IPC_PROTOCOL_MNG:
recv_ipc(dev, doorbell_val);
break;
case IPC_PROTOCOL_ISHTP:
ishtp_recv(dev);
break;
}
eoi:
/* Update IPC counters */
++dev->ipc_rx_cnt;
dev->ipc_rx_bytes_cnt += IPC_HEADER_GET_LENGTH(doorbell_val);
ish_reg_write(dev, IPC_REG_ISH2HOST_DRBL, 0);
/* Flush write to doorbell */
ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
return IRQ_HANDLED;
}
/**
* ish_disable_dma() - disable dma communication between host and ISHFW
* @dev: ishtp device pointer
*
* Clear the dma enable bit and wait for dma inactive.
*
* Return: 0 for success else error code.
*/
int ish_disable_dma(struct ishtp_device *dev)
{
unsigned int dma_delay;
/* Clear the dma enable bit */
ish_reg_write(dev, IPC_REG_ISH_RMP2, 0);
/* wait for dma inactive */
for (dma_delay = 0; dma_delay < MAX_DMA_DELAY &&
_ish_read_fw_sts_reg(dev) & (IPC_ISH_IN_DMA);
dma_delay += 5)
mdelay(5);
if (dma_delay >= MAX_DMA_DELAY) {
dev_err(dev->devc,
"Wait for DMA inactive timeout\n");
return -EBUSY;
}
return 0;
}
/**
* ish_wakeup() - wakeup ishfw from waiting-for-host state
* @dev: ishtp device pointer
*
* Set the dma enable bit and send a void message to FW,
* it wil wakeup FW from waiting-for-host state.
*/
static void ish_wakeup(struct ishtp_device *dev)
{
/* Set dma enable bit */
ish_reg_write(dev, IPC_REG_ISH_RMP2, IPC_RMP2_DMA_ENABLED);
/*
* Send 0 IPC message so that ISH FW wakes up if it was already
* asleep.
*/
ish_reg_write(dev, IPC_REG_HOST2ISH_DRBL, IPC_DRBL_BUSY_BIT);
/* Flush writes to doorbell and REMAP2 */
ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
}
/**
* _ish_hw_reset() - HW reset
* @dev: ishtp device pointer
*
* Reset ISH HW to recover if any error
*
* Return: 0 for success else error fault code
*/
static int _ish_hw_reset(struct ishtp_device *dev)
{
struct pci_dev *pdev = dev->pdev;
int rv;
uint16_t csr;
if (!pdev)
return -ENODEV;
rv = pci_reset_function(pdev);
if (!rv)
dev->dev_state = ISHTP_DEV_RESETTING;
if (!pdev->pm_cap) {
dev_err(&pdev->dev, "Can't reset - no PM caps\n");
return -EINVAL;
}
/* Disable dma communication between FW and host */
if (ish_disable_dma(dev)) {
dev_err(&pdev->dev,
"Can't reset - stuck with DMA in-progress\n");
return -EBUSY;
}
pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &csr);
csr &= ~PCI_PM_CTRL_STATE_MASK;
csr |= PCI_D3hot;
pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, csr);
mdelay(pdev->d3hot_delay);
csr &= ~PCI_PM_CTRL_STATE_MASK;
csr |= PCI_D0;
pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, csr);
/* Now we can enable ISH DMA operation and wakeup ISHFW */
ish_wakeup(dev);
return 0;
}
/**
* _ish_ipc_reset() - IPC reset
* @dev: ishtp device pointer
*
* Resets host and fw IPC and upper layers
*
* Return: 0 for success else error fault code
*/
static int _ish_ipc_reset(struct ishtp_device *dev)
{
struct ipc_rst_payload_type ipc_mng_msg;
int rv = 0;
ipc_mng_msg.reset_id = 1;
ipc_mng_msg.reserved = 0;
set_host_ready(dev);
/* Clear the incoming doorbell */
ish_reg_write(dev, IPC_REG_ISH2HOST_DRBL, 0);
/* Flush write to doorbell */
ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
dev->recvd_hw_ready = 0;
/* send message */
rv = ipc_send_mng_msg(dev, MNG_RESET_NOTIFY, &ipc_mng_msg,
sizeof(struct ipc_rst_payload_type));
if (rv) {
dev_err(dev->devc, "Failed to send IPC MNG_RESET_NOTIFY\n");
return rv;
}
wait_event_interruptible_timeout(dev->wait_hw_ready,
dev->recvd_hw_ready, 2 * HZ);
if (!dev->recvd_hw_ready) {
dev_err(dev->devc, "Timed out waiting for HW ready\n");
rv = -ENODEV;
}
return rv;
}
/**
* ish_hw_start() -Start ISH HW
* @dev: ishtp device pointer
*
* Set host to ready state and wait for FW reset
*
* Return: 0 for success else error fault code
*/
int ish_hw_start(struct ishtp_device *dev)
{
ish_set_host_rdy(dev);
set_host_ready(dev);
/* After that we can enable ISH DMA operation and wakeup ISHFW */
ish_wakeup(dev);
/* wait for FW-initiated reset flow */
if (!dev->recvd_hw_ready)
wait_event_interruptible_timeout(dev->wait_hw_ready,
dev->recvd_hw_ready,
10 * HZ);
if (!dev->recvd_hw_ready) {
dev_err(dev->devc,
"[ishtp-ish]: Timed out waiting for FW-initiated reset\n");
return -ENODEV;
}
return 0;
}
/**
* ish_ipc_get_header() -Get doorbell value
* @dev: ishtp device pointer
* @length: length of message
* @busy: busy status
*
* Get door bell value from message header
*
* Return: door bell value
*/
static uint32_t ish_ipc_get_header(struct ishtp_device *dev, int length,
int busy)
{
uint32_t drbl_val;
drbl_val = IPC_BUILD_HEADER(length, IPC_PROTOCOL_ISHTP, busy);
return drbl_val;
}
/**
* _dma_no_cache_snooping()
*
* Check on current platform, DMA supports cache snooping or not.
* This callback is used to notify uplayer driver if manully cache
* flush is needed when do DMA operation.
*
* Please pay attention to this callback implementation, if declare
* having cache snooping on a cache snooping not supported platform
* will cause uplayer driver receiving mismatched data; and if
* declare no cache snooping on a cache snooping supported platform
* will cause cache be flushed twice and performance hit.
*
* @dev: ishtp device pointer
*
* Return: false - has cache snooping capability
* true - no cache snooping, need manually cache flush
*/
static bool _dma_no_cache_snooping(struct ishtp_device *dev)
{
return (dev->pdev->device == EHL_Ax_DEVICE_ID ||
dev->pdev->device == TGL_LP_DEVICE_ID ||
dev->pdev->device == TGL_H_DEVICE_ID ||
dev->pdev->device == ADL_S_DEVICE_ID ||
dev->pdev->device == ADL_P_DEVICE_ID);
}
static const struct ishtp_hw_ops ish_hw_ops = {
.hw_reset = _ish_hw_reset,
.ipc_reset = _ish_ipc_reset,
.ipc_get_header = ish_ipc_get_header,
.ishtp_read = _ishtp_read,
.write = write_ipc_to_queue,
.get_fw_status = _ish_read_fw_sts_reg,
.sync_fw_clock = _ish_sync_fw_clock,
.ishtp_read_hdr = _ishtp_read_hdr,
.dma_no_cache_snooping = _dma_no_cache_snooping
};
/**
* ish_dev_init() -Initialize ISH devoce
* @pdev: PCI device
*
* Allocate ISHTP device and initialize IPC processing
*
* Return: ISHTP device instance on success else NULL
*/
struct ishtp_device *ish_dev_init(struct pci_dev *pdev)
{
struct ishtp_device *dev;
int i;
int ret;
dev = devm_kzalloc(&pdev->dev,
sizeof(struct ishtp_device) + sizeof(struct ish_hw),
GFP_KERNEL);
if (!dev)
return NULL;
ishtp_device_init(dev);
init_waitqueue_head(&dev->wait_hw_ready);
spin_lock_init(&dev->wr_processing_spinlock);
/* Init IPC processing and free lists */
INIT_LIST_HEAD(&dev->wr_processing_list);
INIT_LIST_HEAD(&dev->wr_free_list);
for (i = 0; i < IPC_TX_FIFO_SIZE; i++) {
struct wr_msg_ctl_info *tx_buf;
tx_buf = devm_kzalloc(&pdev->dev,
sizeof(struct wr_msg_ctl_info),
GFP_KERNEL);
if (!tx_buf) {
/*
* IPC buffers may be limited or not available
* at all - although this shouldn't happen
*/
dev_err(dev->devc,
"[ishtp-ish]: failure in Tx FIFO allocations (%d)\n",
i);
break;
}
list_add_tail(&tx_buf->link, &dev->wr_free_list);
}
ret = devm_work_autocancel(&pdev->dev, &fw_reset_work, fw_reset_work_fn);
if (ret) {
dev_err(dev->devc, "Failed to initialise FW reset work\n");
return NULL;
}
dev->ops = &ish_hw_ops;
dev->devc = &pdev->dev;
dev->mtu = IPC_PAYLOAD_SIZE - sizeof(struct ishtp_msg_hdr);
return dev;
}
/**
* ish_device_disable() - Disable ISH device
* @dev: ISHTP device pointer
*
* Disable ISH by clearing host ready to inform firmware.
*/
void ish_device_disable(struct ishtp_device *dev)
{
struct pci_dev *pdev = dev->pdev;
if (!pdev)
return;
/* Disable dma communication between FW and host */
if (ish_disable_dma(dev)) {
dev_err(&pdev->dev,
"Can't reset - stuck with DMA in-progress\n");
return;
}
/* Put ISH to D3hot state for power saving */
pci_set_power_state(pdev, PCI_D3hot);
dev->dev_state = ISHTP_DEV_DISABLED;
ish_clr_host_rdy(dev);
}
| linux-master | drivers/hid/intel-ish-hid/ipc/ipc.c |
// SPDX-License-Identifier: GPL-2.0+
/*
* Surface System Aggregator Module (SSAM) HID transport driver for the
* generic HID interface (HID/TC=0x15 subsystem). Provides support for
* integrated HID devices on Surface Laptop 3, Book 3, and later.
*
* Copyright (C) 2019-2021 Blaž Hrastnik <[email protected]>,
* Maximilian Luz <[email protected]>
*/
#include <asm/unaligned.h>
#include <linux/hid.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/surface_aggregator/controller.h>
#include <linux/surface_aggregator/device.h>
#include "surface_hid_core.h"
/* -- SAM interface. -------------------------------------------------------- */
struct surface_hid_buffer_slice {
__u8 entry;
__le32 offset;
__le32 length;
__u8 end;
__u8 data[];
} __packed;
static_assert(sizeof(struct surface_hid_buffer_slice) == 10);
enum surface_hid_cid {
SURFACE_HID_CID_OUTPUT_REPORT = 0x01,
SURFACE_HID_CID_GET_FEATURE_REPORT = 0x02,
SURFACE_HID_CID_SET_FEATURE_REPORT = 0x03,
SURFACE_HID_CID_GET_DESCRIPTOR = 0x04,
};
static int ssam_hid_get_descriptor(struct surface_hid_device *shid, u8 entry, u8 *buf, size_t len)
{
u8 buffer[sizeof(struct surface_hid_buffer_slice) + 0x76];
struct surface_hid_buffer_slice *slice;
struct ssam_request rqst;
struct ssam_response rsp;
u32 buffer_len, offset, length;
int status;
/*
* Note: The 0x76 above has been chosen because that's what's used by
* the Windows driver. Together with the header, this leads to a 128
* byte payload in total.
*/
buffer_len = ARRAY_SIZE(buffer) - sizeof(struct surface_hid_buffer_slice);
rqst.target_category = shid->uid.category;
rqst.target_id = shid->uid.target;
rqst.command_id = SURFACE_HID_CID_GET_DESCRIPTOR;
rqst.instance_id = shid->uid.instance;
rqst.flags = SSAM_REQUEST_HAS_RESPONSE;
rqst.length = sizeof(struct surface_hid_buffer_slice);
rqst.payload = buffer;
rsp.capacity = ARRAY_SIZE(buffer);
rsp.pointer = buffer;
slice = (struct surface_hid_buffer_slice *)buffer;
slice->entry = entry;
slice->end = 0;
offset = 0;
length = buffer_len;
while (!slice->end && offset < len) {
put_unaligned_le32(offset, &slice->offset);
put_unaligned_le32(length, &slice->length);
rsp.length = 0;
status = ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, &rsp,
sizeof(*slice));
if (status)
return status;
offset = get_unaligned_le32(&slice->offset);
length = get_unaligned_le32(&slice->length);
/* Don't mess stuff up in case we receive garbage. */
if (length > buffer_len || offset > len)
return -EPROTO;
if (offset + length > len)
length = len - offset;
memcpy(buf + offset, &slice->data[0], length);
offset += length;
length = buffer_len;
}
if (offset != len) {
dev_err(shid->dev, "unexpected descriptor length: got %u, expected %zu\n",
offset, len);
return -EPROTO;
}
return 0;
}
static int ssam_hid_set_raw_report(struct surface_hid_device *shid, u8 rprt_id, bool feature,
u8 *buf, size_t len)
{
struct ssam_request rqst;
u8 cid;
if (feature)
cid = SURFACE_HID_CID_SET_FEATURE_REPORT;
else
cid = SURFACE_HID_CID_OUTPUT_REPORT;
rqst.target_category = shid->uid.category;
rqst.target_id = shid->uid.target;
rqst.instance_id = shid->uid.instance;
rqst.command_id = cid;
rqst.flags = 0;
rqst.length = len;
rqst.payload = buf;
buf[0] = rprt_id;
return ssam_retry(ssam_request_do_sync, shid->ctrl, &rqst, NULL);
}
static int ssam_hid_get_raw_report(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len)
{
struct ssam_request rqst;
struct ssam_response rsp;
rqst.target_category = shid->uid.category;
rqst.target_id = shid->uid.target;
rqst.instance_id = shid->uid.instance;
rqst.command_id = SURFACE_HID_CID_GET_FEATURE_REPORT;
rqst.flags = SSAM_REQUEST_HAS_RESPONSE;
rqst.length = sizeof(rprt_id);
rqst.payload = &rprt_id;
rsp.capacity = len;
rsp.length = 0;
rsp.pointer = buf;
return ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, &rsp, sizeof(rprt_id));
}
static u32 ssam_hid_event_fn(struct ssam_event_notifier *nf, const struct ssam_event *event)
{
struct surface_hid_device *shid = container_of(nf, struct surface_hid_device, notif);
if (event->command_id != 0x00)
return 0;
hid_input_report(shid->hid, HID_INPUT_REPORT, (u8 *)&event->data[0], event->length, 0);
return SSAM_NOTIF_HANDLED;
}
/* -- Transport driver. ----------------------------------------------------- */
static int shid_output_report(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len)
{
int status;
status = ssam_hid_set_raw_report(shid, rprt_id, false, buf, len);
return status >= 0 ? len : status;
}
static int shid_get_feature_report(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len)
{
int status;
status = ssam_hid_get_raw_report(shid, rprt_id, buf, len);
return status >= 0 ? len : status;
}
static int shid_set_feature_report(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len)
{
int status;
status = ssam_hid_set_raw_report(shid, rprt_id, true, buf, len);
return status >= 0 ? len : status;
}
/* -- Driver setup. --------------------------------------------------------- */
static int surface_hid_probe(struct ssam_device *sdev)
{
struct surface_hid_device *shid;
shid = devm_kzalloc(&sdev->dev, sizeof(*shid), GFP_KERNEL);
if (!shid)
return -ENOMEM;
shid->dev = &sdev->dev;
shid->ctrl = sdev->ctrl;
shid->uid = sdev->uid;
shid->notif.base.priority = 1;
shid->notif.base.fn = ssam_hid_event_fn;
shid->notif.event.reg = SSAM_EVENT_REGISTRY_REG(sdev->uid.target);
shid->notif.event.id.target_category = sdev->uid.category;
shid->notif.event.id.instance = sdev->uid.instance;
shid->notif.event.mask = SSAM_EVENT_MASK_STRICT;
shid->notif.event.flags = 0;
shid->ops.get_descriptor = ssam_hid_get_descriptor;
shid->ops.output_report = shid_output_report;
shid->ops.get_feature_report = shid_get_feature_report;
shid->ops.set_feature_report = shid_set_feature_report;
ssam_device_set_drvdata(sdev, shid);
return surface_hid_device_add(shid);
}
static void surface_hid_remove(struct ssam_device *sdev)
{
surface_hid_device_destroy(ssam_device_get_drvdata(sdev));
}
static const struct ssam_device_id surface_hid_match[] = {
{ SSAM_SDEV(HID, ANY, SSAM_SSH_IID_ANY, 0x00) },
{ },
};
MODULE_DEVICE_TABLE(ssam, surface_hid_match);
static struct ssam_device_driver surface_hid_driver = {
.probe = surface_hid_probe,
.remove = surface_hid_remove,
.match_table = surface_hid_match,
.driver = {
.name = "surface_hid",
.pm = &surface_hid_pm_ops,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
module_ssam_device_driver(surface_hid_driver);
MODULE_AUTHOR("Blaž Hrastnik <[email protected]>");
MODULE_AUTHOR("Maximilian Luz <[email protected]>");
MODULE_DESCRIPTION("HID transport driver for Surface System Aggregator Module");
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/surface-hid/surface_hid.c |
// SPDX-License-Identifier: GPL-2.0+
/*
* Common/core components for the Surface System Aggregator Module (SSAM) HID
* transport driver. Provides support for integrated HID devices on Microsoft
* Surface models.
*
* Copyright (C) 2019-2021 Maximilian Luz <[email protected]>
*/
#include <asm/unaligned.h>
#include <linux/hid.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/usb/ch9.h>
#include <linux/surface_aggregator/controller.h>
#include "surface_hid_core.h"
/* -- Utility functions. ---------------------------------------------------- */
static bool surface_hid_is_hot_removed(struct surface_hid_device *shid)
{
/*
* Non-ssam client devices, i.e. platform client devices, cannot be
* hot-removed.
*/
if (!is_ssam_device(shid->dev))
return false;
return ssam_device_is_hot_removed(to_ssam_device(shid->dev));
}
/* -- Device descriptor access. --------------------------------------------- */
static int surface_hid_load_hid_descriptor(struct surface_hid_device *shid)
{
int status;
if (surface_hid_is_hot_removed(shid))
return -ENODEV;
status = shid->ops.get_descriptor(shid, SURFACE_HID_DESC_HID,
(u8 *)&shid->hid_desc, sizeof(shid->hid_desc));
if (status)
return status;
if (shid->hid_desc.desc_len != sizeof(shid->hid_desc)) {
dev_err(shid->dev, "unexpected HID descriptor length: got %u, expected %zu\n",
shid->hid_desc.desc_len, sizeof(shid->hid_desc));
return -EPROTO;
}
if (shid->hid_desc.desc_type != HID_DT_HID) {
dev_err(shid->dev, "unexpected HID descriptor type: got %#04x, expected %#04x\n",
shid->hid_desc.desc_type, HID_DT_HID);
return -EPROTO;
}
if (shid->hid_desc.num_descriptors != 1) {
dev_err(shid->dev, "unexpected number of descriptors: got %u, expected 1\n",
shid->hid_desc.num_descriptors);
return -EPROTO;
}
if (shid->hid_desc.report_desc_type != HID_DT_REPORT) {
dev_err(shid->dev, "unexpected report descriptor type: got %#04x, expected %#04x\n",
shid->hid_desc.report_desc_type, HID_DT_REPORT);
return -EPROTO;
}
return 0;
}
static int surface_hid_load_device_attributes(struct surface_hid_device *shid)
{
int status;
if (surface_hid_is_hot_removed(shid))
return -ENODEV;
status = shid->ops.get_descriptor(shid, SURFACE_HID_DESC_ATTRS,
(u8 *)&shid->attrs, sizeof(shid->attrs));
if (status)
return status;
if (get_unaligned_le32(&shid->attrs.length) != sizeof(shid->attrs)) {
dev_err(shid->dev, "unexpected attribute length: got %u, expected %zu\n",
get_unaligned_le32(&shid->attrs.length), sizeof(shid->attrs));
return -EPROTO;
}
return 0;
}
/* -- Transport driver (common). -------------------------------------------- */
static int surface_hid_start(struct hid_device *hid)
{
struct surface_hid_device *shid = hid->driver_data;
return ssam_notifier_register(shid->ctrl, &shid->notif);
}
static void surface_hid_stop(struct hid_device *hid)
{
struct surface_hid_device *shid = hid->driver_data;
bool hot_removed;
/*
* Communication may fail for devices that have been hot-removed. This
* also includes unregistration of HID events, so we need to check this
* here. Only if the device has not been marked as hot-removed, we can
* safely disable events.
*/
hot_removed = surface_hid_is_hot_removed(shid);
/* Note: This call will log errors for us, so ignore them here. */
__ssam_notifier_unregister(shid->ctrl, &shid->notif, !hot_removed);
}
static int surface_hid_open(struct hid_device *hid)
{
return 0;
}
static void surface_hid_close(struct hid_device *hid)
{
}
static int surface_hid_parse(struct hid_device *hid)
{
struct surface_hid_device *shid = hid->driver_data;
size_t len = get_unaligned_le16(&shid->hid_desc.report_desc_len);
u8 *buf;
int status;
if (surface_hid_is_hot_removed(shid))
return -ENODEV;
buf = kzalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
status = shid->ops.get_descriptor(shid, SURFACE_HID_DESC_REPORT, buf, len);
if (!status)
status = hid_parse_report(hid, buf, len);
kfree(buf);
return status;
}
static int surface_hid_raw_request(struct hid_device *hid, unsigned char reportnum, u8 *buf,
size_t len, unsigned char rtype, int reqtype)
{
struct surface_hid_device *shid = hid->driver_data;
if (surface_hid_is_hot_removed(shid))
return -ENODEV;
if (rtype == HID_OUTPUT_REPORT && reqtype == HID_REQ_SET_REPORT)
return shid->ops.output_report(shid, reportnum, buf, len);
else if (rtype == HID_FEATURE_REPORT && reqtype == HID_REQ_GET_REPORT)
return shid->ops.get_feature_report(shid, reportnum, buf, len);
else if (rtype == HID_FEATURE_REPORT && reqtype == HID_REQ_SET_REPORT)
return shid->ops.set_feature_report(shid, reportnum, buf, len);
return -EIO;
}
static const struct hid_ll_driver surface_hid_ll_driver = {
.start = surface_hid_start,
.stop = surface_hid_stop,
.open = surface_hid_open,
.close = surface_hid_close,
.parse = surface_hid_parse,
.raw_request = surface_hid_raw_request,
};
/* -- Common device setup. -------------------------------------------------- */
int surface_hid_device_add(struct surface_hid_device *shid)
{
int status;
status = surface_hid_load_hid_descriptor(shid);
if (status)
return status;
status = surface_hid_load_device_attributes(shid);
if (status)
return status;
shid->hid = hid_allocate_device();
if (IS_ERR(shid->hid))
return PTR_ERR(shid->hid);
shid->hid->dev.parent = shid->dev;
shid->hid->bus = BUS_HOST;
shid->hid->vendor = get_unaligned_le16(&shid->attrs.vendor);
shid->hid->product = get_unaligned_le16(&shid->attrs.product);
shid->hid->version = get_unaligned_le16(&shid->hid_desc.hid_version);
shid->hid->country = shid->hid_desc.country_code;
snprintf(shid->hid->name, sizeof(shid->hid->name), "Microsoft Surface %04X:%04X",
shid->hid->vendor, shid->hid->product);
strscpy(shid->hid->phys, dev_name(shid->dev), sizeof(shid->hid->phys));
shid->hid->driver_data = shid;
shid->hid->ll_driver = &surface_hid_ll_driver;
status = hid_add_device(shid->hid);
if (status)
hid_destroy_device(shid->hid);
return status;
}
EXPORT_SYMBOL_GPL(surface_hid_device_add);
void surface_hid_device_destroy(struct surface_hid_device *shid)
{
hid_destroy_device(shid->hid);
}
EXPORT_SYMBOL_GPL(surface_hid_device_destroy);
/* -- PM ops. --------------------------------------------------------------- */
#ifdef CONFIG_PM_SLEEP
static int surface_hid_suspend(struct device *dev)
{
struct surface_hid_device *d = dev_get_drvdata(dev);
return hid_driver_suspend(d->hid, PMSG_SUSPEND);
}
static int surface_hid_resume(struct device *dev)
{
struct surface_hid_device *d = dev_get_drvdata(dev);
return hid_driver_resume(d->hid);
}
static int surface_hid_freeze(struct device *dev)
{
struct surface_hid_device *d = dev_get_drvdata(dev);
return hid_driver_suspend(d->hid, PMSG_FREEZE);
}
static int surface_hid_poweroff(struct device *dev)
{
struct surface_hid_device *d = dev_get_drvdata(dev);
return hid_driver_suspend(d->hid, PMSG_HIBERNATE);
}
static int surface_hid_restore(struct device *dev)
{
struct surface_hid_device *d = dev_get_drvdata(dev);
return hid_driver_reset_resume(d->hid);
}
const struct dev_pm_ops surface_hid_pm_ops = {
.freeze = surface_hid_freeze,
.thaw = surface_hid_resume,
.suspend = surface_hid_suspend,
.resume = surface_hid_resume,
.poweroff = surface_hid_poweroff,
.restore = surface_hid_restore,
};
EXPORT_SYMBOL_GPL(surface_hid_pm_ops);
#else /* CONFIG_PM_SLEEP */
const struct dev_pm_ops surface_hid_pm_ops = { };
EXPORT_SYMBOL_GPL(surface_hid_pm_ops);
#endif /* CONFIG_PM_SLEEP */
MODULE_AUTHOR("Maximilian Luz <[email protected]>");
MODULE_DESCRIPTION("HID transport driver core for Surface System Aggregator Module");
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/surface-hid/surface_hid_core.c |
// SPDX-License-Identifier: GPL-2.0+
/*
* Surface System Aggregator Module (SSAM) HID transport driver for the legacy
* keyboard interface (KBD/TC=0x08 subsystem). Provides support for the
* integrated HID keyboard on Surface Laptops 1 and 2.
*
* Copyright (C) 2019-2021 Maximilian Luz <[email protected]>
*/
#include <asm/unaligned.h>
#include <linux/hid.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/surface_aggregator/controller.h>
#include "surface_hid_core.h"
/* -- SAM interface (KBD). -------------------------------------------------- */
#define KBD_FEATURE_REPORT_SIZE 7 /* 6 + report ID */
enum surface_kbd_cid {
SURFACE_KBD_CID_GET_DESCRIPTOR = 0x00,
SURFACE_KBD_CID_SET_CAPSLOCK_LED = 0x01,
SURFACE_KBD_CID_EVT_INPUT_GENERIC = 0x03,
SURFACE_KBD_CID_EVT_INPUT_HOTKEYS = 0x04,
SURFACE_KBD_CID_GET_FEATURE_REPORT = 0x0b,
};
static int ssam_kbd_get_descriptor(struct surface_hid_device *shid, u8 entry, u8 *buf, size_t len)
{
struct ssam_request rqst;
struct ssam_response rsp;
int status;
rqst.target_category = shid->uid.category;
rqst.target_id = shid->uid.target;
rqst.command_id = SURFACE_KBD_CID_GET_DESCRIPTOR;
rqst.instance_id = shid->uid.instance;
rqst.flags = SSAM_REQUEST_HAS_RESPONSE;
rqst.length = sizeof(entry);
rqst.payload = &entry;
rsp.capacity = len;
rsp.length = 0;
rsp.pointer = buf;
status = ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, &rsp, sizeof(entry));
if (status)
return status;
if (rsp.length != len) {
dev_err(shid->dev, "invalid descriptor length: got %zu, expected, %zu\n",
rsp.length, len);
return -EPROTO;
}
return 0;
}
static int ssam_kbd_set_caps_led(struct surface_hid_device *shid, bool value)
{
struct ssam_request rqst;
u8 value_u8 = value;
rqst.target_category = shid->uid.category;
rqst.target_id = shid->uid.target;
rqst.command_id = SURFACE_KBD_CID_SET_CAPSLOCK_LED;
rqst.instance_id = shid->uid.instance;
rqst.flags = 0;
rqst.length = sizeof(value_u8);
rqst.payload = &value_u8;
return ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, NULL, sizeof(value_u8));
}
static int ssam_kbd_get_feature_report(struct surface_hid_device *shid, u8 *buf, size_t len)
{
struct ssam_request rqst;
struct ssam_response rsp;
u8 payload = 0;
int status;
rqst.target_category = shid->uid.category;
rqst.target_id = shid->uid.target;
rqst.command_id = SURFACE_KBD_CID_GET_FEATURE_REPORT;
rqst.instance_id = shid->uid.instance;
rqst.flags = SSAM_REQUEST_HAS_RESPONSE;
rqst.length = sizeof(payload);
rqst.payload = &payload;
rsp.capacity = len;
rsp.length = 0;
rsp.pointer = buf;
status = ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, &rsp, sizeof(payload));
if (status)
return status;
if (rsp.length != len) {
dev_err(shid->dev, "invalid feature report length: got %zu, expected, %zu\n",
rsp.length, len);
return -EPROTO;
}
return 0;
}
static bool ssam_kbd_is_input_event(const struct ssam_event *event)
{
if (event->command_id == SURFACE_KBD_CID_EVT_INPUT_GENERIC)
return true;
if (event->command_id == SURFACE_KBD_CID_EVT_INPUT_HOTKEYS)
return true;
return false;
}
static u32 ssam_kbd_event_fn(struct ssam_event_notifier *nf, const struct ssam_event *event)
{
struct surface_hid_device *shid = container_of(nf, struct surface_hid_device, notif);
/*
* Check against device UID manually, as registry and device target
* category doesn't line up.
*/
if (shid->uid.category != event->target_category)
return 0;
if (shid->uid.target != event->target_id)
return 0;
if (shid->uid.instance != event->instance_id)
return 0;
if (!ssam_kbd_is_input_event(event))
return 0;
hid_input_report(shid->hid, HID_INPUT_REPORT, (u8 *)&event->data[0], event->length, 0);
return SSAM_NOTIF_HANDLED;
}
/* -- Transport driver (KBD). ----------------------------------------------- */
static int skbd_get_caps_led_value(struct hid_device *hid, u8 rprt_id, u8 *buf, size_t len)
{
struct hid_field *field;
unsigned int offset, size;
int i;
/* Get LED field. */
field = hidinput_get_led_field(hid);
if (!field)
return -ENOENT;
/* Check if we got the correct report. */
if (len != hid_report_len(field->report))
return -ENOENT;
if (rprt_id != field->report->id)
return -ENOENT;
/* Get caps lock LED index. */
for (i = 0; i < field->report_count; i++)
if ((field->usage[i].hid & 0xffff) == 0x02)
break;
if (i == field->report_count)
return -ENOENT;
/* Extract value. */
size = field->report_size;
offset = field->report_offset + i * size;
return !!hid_field_extract(hid, buf + 1, size, offset);
}
static int skbd_output_report(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len)
{
int caps_led;
int status;
caps_led = skbd_get_caps_led_value(shid->hid, rprt_id, buf, len);
if (caps_led < 0)
return -EIO; /* Only caps LED output reports are supported. */
status = ssam_kbd_set_caps_led(shid, caps_led);
if (status < 0)
return status;
return len;
}
static int skbd_get_feature_report(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len)
{
u8 report[KBD_FEATURE_REPORT_SIZE];
int status;
/*
* The keyboard only has a single hard-coded read-only feature report
* of size KBD_FEATURE_REPORT_SIZE. Try to load it and compare its
* report ID against the requested one.
*/
if (len < ARRAY_SIZE(report))
return -ENOSPC;
status = ssam_kbd_get_feature_report(shid, report, ARRAY_SIZE(report));
if (status < 0)
return status;
if (rprt_id != report[0])
return -ENOENT;
memcpy(buf, report, ARRAY_SIZE(report));
return len;
}
static int skbd_set_feature_report(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len)
{
/* Not supported. See skbd_get_feature_report() for details. */
return -EIO;
}
/* -- Driver setup. --------------------------------------------------------- */
static int surface_kbd_probe(struct platform_device *pdev)
{
struct ssam_controller *ctrl;
struct surface_hid_device *shid;
/* Add device link to EC. */
ctrl = ssam_client_bind(&pdev->dev);
if (IS_ERR(ctrl))
return PTR_ERR(ctrl) == -ENODEV ? -EPROBE_DEFER : PTR_ERR(ctrl);
shid = devm_kzalloc(&pdev->dev, sizeof(*shid), GFP_KERNEL);
if (!shid)
return -ENOMEM;
shid->dev = &pdev->dev;
shid->ctrl = ctrl;
shid->uid.domain = SSAM_DOMAIN_SERIALHUB;
shid->uid.category = SSAM_SSH_TC_KBD;
shid->uid.target = SSAM_SSH_TID_KIP;
shid->uid.instance = 0;
shid->uid.function = 0;
shid->notif.base.priority = 1;
shid->notif.base.fn = ssam_kbd_event_fn;
shid->notif.event.reg = SSAM_EVENT_REGISTRY_SAM;
shid->notif.event.id.target_category = shid->uid.category;
shid->notif.event.id.instance = shid->uid.instance;
shid->notif.event.mask = SSAM_EVENT_MASK_NONE;
shid->notif.event.flags = 0;
shid->ops.get_descriptor = ssam_kbd_get_descriptor;
shid->ops.output_report = skbd_output_report;
shid->ops.get_feature_report = skbd_get_feature_report;
shid->ops.set_feature_report = skbd_set_feature_report;
platform_set_drvdata(pdev, shid);
return surface_hid_device_add(shid);
}
static int surface_kbd_remove(struct platform_device *pdev)
{
surface_hid_device_destroy(platform_get_drvdata(pdev));
return 0;
}
static const struct acpi_device_id surface_kbd_match[] = {
{ "MSHW0096" },
{ },
};
MODULE_DEVICE_TABLE(acpi, surface_kbd_match);
static struct platform_driver surface_kbd_driver = {
.probe = surface_kbd_probe,
.remove = surface_kbd_remove,
.driver = {
.name = "surface_keyboard",
.acpi_match_table = surface_kbd_match,
.pm = &surface_hid_pm_ops,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
module_platform_driver(surface_kbd_driver);
MODULE_AUTHOR("Maximilian Luz <[email protected]>");
MODULE_DESCRIPTION("HID legacy transport driver for Surface System Aggregator Module");
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/surface-hid/surface_kbd.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* HID-BPF support for Linux
*
* Copyright (c) 2022 Benjamin Tissoires
*/
#include <linux/bitops.h>
#include <linux/btf.h>
#include <linux/btf_ids.h>
#include <linux/circ_buf.h>
#include <linux/filter.h>
#include <linux/hid.h>
#include <linux/hid_bpf.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/workqueue.h>
#include "hid_bpf_dispatch.h"
#include "entrypoints/entrypoints.lskel.h"
#define HID_BPF_MAX_PROGS 1024 /* keep this in sync with preloaded bpf,
* needs to be a power of 2 as we use it as
* a circular buffer
*/
#define NEXT(idx) (((idx) + 1) & (HID_BPF_MAX_PROGS - 1))
#define PREV(idx) (((idx) - 1) & (HID_BPF_MAX_PROGS - 1))
/*
* represents one attached program stored in the hid jump table
*/
struct hid_bpf_prog_entry {
struct bpf_prog *prog;
struct hid_device *hdev;
enum hid_bpf_prog_type type;
u16 idx;
};
struct hid_bpf_jmp_table {
struct bpf_map *map;
struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */
int tail, head;
struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */
unsigned long enabled[BITS_TO_LONGS(HID_BPF_MAX_PROGS)];
};
#define FOR_ENTRIES(__i, __start, __end) \
for (__i = __start; CIRC_CNT(__end, __i, HID_BPF_MAX_PROGS); __i = NEXT(__i))
static struct hid_bpf_jmp_table jmp_table;
static DEFINE_MUTEX(hid_bpf_attach_lock); /* held when attaching/detaching programs */
static void hid_bpf_release_progs(struct work_struct *work);
static DECLARE_WORK(release_work, hid_bpf_release_progs);
BTF_ID_LIST(hid_bpf_btf_ids)
BTF_ID(func, hid_bpf_device_event) /* HID_BPF_PROG_TYPE_DEVICE_EVENT */
BTF_ID(func, hid_bpf_rdesc_fixup) /* HID_BPF_PROG_TYPE_RDESC_FIXUP */
static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
{
switch (type) {
case HID_BPF_PROG_TYPE_DEVICE_EVENT:
return HID_BPF_MAX_PROGS_PER_DEV;
case HID_BPF_PROG_TYPE_RDESC_FIXUP:
return 1;
default:
return -EINVAL;
}
}
static int hid_bpf_program_count(struct hid_device *hdev,
struct bpf_prog *prog,
enum hid_bpf_prog_type type)
{
int i, n = 0;
if (type >= HID_BPF_PROG_TYPE_MAX)
return -EINVAL;
FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
if (type != HID_BPF_PROG_TYPE_UNDEF && entry->type != type)
continue;
if (hdev && entry->hdev != hdev)
continue;
if (prog && entry->prog != prog)
continue;
n++;
}
return n;
}
__weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx)
{
return 0;
}
int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
struct hid_bpf_ctx_kern *ctx_kern)
{
struct hid_bpf_prog_list *prog_list;
int i, idx, err = 0;
rcu_read_lock();
prog_list = rcu_dereference(hdev->bpf.progs[type]);
if (!prog_list)
goto out_unlock;
for (i = 0; i < prog_list->prog_cnt; i++) {
idx = prog_list->prog_idx[i];
if (!test_bit(idx, jmp_table.enabled))
continue;
ctx_kern->ctx.index = idx;
err = __hid_bpf_tail_call(&ctx_kern->ctx);
if (err < 0)
break;
if (err)
ctx_kern->ctx.retval = err;
}
out_unlock:
rcu_read_unlock();
return err;
}
/*
* assign the list of programs attached to a given hid device.
*/
static void __hid_bpf_set_hdev_progs(struct hid_device *hdev, struct hid_bpf_prog_list *new_list,
enum hid_bpf_prog_type type)
{
struct hid_bpf_prog_list *old_list;
spin_lock(&hdev->bpf.progs_lock);
old_list = rcu_dereference_protected(hdev->bpf.progs[type],
lockdep_is_held(&hdev->bpf.progs_lock));
rcu_assign_pointer(hdev->bpf.progs[type], new_list);
spin_unlock(&hdev->bpf.progs_lock);
synchronize_rcu();
kfree(old_list);
}
/*
* allocate and populate the list of programs attached to a given hid device.
*
* Must be called under lock.
*/
static int hid_bpf_populate_hdev(struct hid_device *hdev, enum hid_bpf_prog_type type)
{
struct hid_bpf_prog_list *new_list;
int i;
if (type >= HID_BPF_PROG_TYPE_MAX || !hdev)
return -EINVAL;
if (hdev->bpf.destroyed)
return 0;
new_list = kzalloc(sizeof(*new_list), GFP_KERNEL);
if (!new_list)
return -ENOMEM;
FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
if (entry->type == type && entry->hdev == hdev &&
test_bit(entry->idx, jmp_table.enabled))
new_list->prog_idx[new_list->prog_cnt++] = entry->idx;
}
__hid_bpf_set_hdev_progs(hdev, new_list, type);
return 0;
}
static void __hid_bpf_do_release_prog(int map_fd, unsigned int idx)
{
skel_map_delete_elem(map_fd, &idx);
jmp_table.progs[idx] = NULL;
}
static void hid_bpf_release_progs(struct work_struct *work)
{
int i, j, n, map_fd = -1;
if (!jmp_table.map)
return;
/* retrieve a fd of our prog_array map in BPF */
map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
if (map_fd < 0)
return;
mutex_lock(&hid_bpf_attach_lock); /* protects against attaching new programs */
/* detach unused progs from HID devices */
FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
enum hid_bpf_prog_type type;
struct hid_device *hdev;
if (test_bit(entry->idx, jmp_table.enabled))
continue;
/* we have an attached prog */
if (entry->hdev) {
hdev = entry->hdev;
type = entry->type;
hid_bpf_populate_hdev(hdev, type);
/* mark all other disabled progs from hdev of the given type as detached */
FOR_ENTRIES(j, i, jmp_table.head) {
struct hid_bpf_prog_entry *next;
next = &jmp_table.entries[j];
if (test_bit(next->idx, jmp_table.enabled))
continue;
if (next->hdev == hdev && next->type == type)
next->hdev = NULL;
}
/* if type was rdesc fixup, reconnect device */
if (type == HID_BPF_PROG_TYPE_RDESC_FIXUP)
hid_bpf_reconnect(hdev);
}
}
/* remove all unused progs from the jump table */
FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
if (test_bit(entry->idx, jmp_table.enabled))
continue;
if (entry->prog)
__hid_bpf_do_release_prog(map_fd, entry->idx);
}
/* compact the entry list */
n = jmp_table.tail;
FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
if (!test_bit(entry->idx, jmp_table.enabled))
continue;
jmp_table.entries[n] = jmp_table.entries[i];
n = NEXT(n);
}
jmp_table.head = n;
mutex_unlock(&hid_bpf_attach_lock);
if (map_fd >= 0)
close_fd(map_fd);
}
static void hid_bpf_release_prog_at(int idx)
{
int map_fd = -1;
/* retrieve a fd of our prog_array map in BPF */
map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
if (map_fd < 0)
return;
__hid_bpf_do_release_prog(map_fd, idx);
close(map_fd);
}
/*
* Insert the given BPF program represented by its fd in the jmp table.
* Returns the index in the jump table or a negative error.
*/
static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
{
int i, index = -1, map_fd = -1, err = -EINVAL;
/* retrieve a fd of our prog_array map in BPF */
map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
if (map_fd < 0) {
err = -EINVAL;
goto out;
}
/* find the first available index in the jmp_table */
for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
if (!jmp_table.progs[i] && index < 0) {
/* mark the index as used */
jmp_table.progs[i] = prog;
index = i;
__set_bit(i, jmp_table.enabled);
}
}
if (index < 0) {
err = -ENOMEM;
goto out;
}
/* insert the program in the jump table */
err = skel_map_update_elem(map_fd, &index, &prog_fd, 0);
if (err)
goto out;
/* return the index */
err = index;
out:
if (err < 0)
__hid_bpf_do_release_prog(map_fd, index);
if (map_fd >= 0)
close_fd(map_fd);
return err;
}
int hid_bpf_get_prog_attach_type(int prog_fd)
{
struct bpf_prog *prog = NULL;
int i;
int prog_type = HID_BPF_PROG_TYPE_UNDEF;
prog = bpf_prog_get(prog_fd);
if (IS_ERR(prog))
return PTR_ERR(prog);
for (i = 0; i < HID_BPF_PROG_TYPE_MAX; i++) {
if (hid_bpf_btf_ids[i] == prog->aux->attach_btf_id) {
prog_type = i;
break;
}
}
bpf_prog_put(prog);
return prog_type;
}
static void hid_bpf_link_release(struct bpf_link *link)
{
struct hid_bpf_link *hid_link =
container_of(link, struct hid_bpf_link, link);
__clear_bit(hid_link->hid_table_index, jmp_table.enabled);
schedule_work(&release_work);
}
static void hid_bpf_link_dealloc(struct bpf_link *link)
{
struct hid_bpf_link *hid_link =
container_of(link, struct hid_bpf_link, link);
kfree(hid_link);
}
static void hid_bpf_link_show_fdinfo(const struct bpf_link *link,
struct seq_file *seq)
{
seq_printf(seq,
"attach_type:\tHID-BPF\n");
}
static const struct bpf_link_ops hid_bpf_link_lops = {
.release = hid_bpf_link_release,
.dealloc = hid_bpf_link_dealloc,
.show_fdinfo = hid_bpf_link_show_fdinfo,
};
/* called from syscall */
noinline int
__hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
int prog_fd, __u32 flags)
{
struct bpf_link_primer link_primer;
struct hid_bpf_link *link;
struct bpf_prog *prog = NULL;
struct hid_bpf_prog_entry *prog_entry;
int cnt, err = -EINVAL, prog_table_idx = -1;
/* take a ref on the prog itself */
prog = bpf_prog_get(prog_fd);
if (IS_ERR(prog))
return PTR_ERR(prog);
mutex_lock(&hid_bpf_attach_lock);
link = kzalloc(sizeof(*link), GFP_USER);
if (!link) {
err = -ENOMEM;
goto err_unlock;
}
bpf_link_init(&link->link, BPF_LINK_TYPE_UNSPEC,
&hid_bpf_link_lops, prog);
/* do not attach too many programs to a given HID device */
cnt = hid_bpf_program_count(hdev, NULL, prog_type);
if (cnt < 0) {
err = cnt;
goto err_unlock;
}
if (cnt >= hid_bpf_max_programs(prog_type)) {
err = -E2BIG;
goto err_unlock;
}
prog_table_idx = hid_bpf_insert_prog(prog_fd, prog);
/* if the jmp table is full, abort */
if (prog_table_idx < 0) {
err = prog_table_idx;
goto err_unlock;
}
if (flags & HID_BPF_FLAG_INSERT_HEAD) {
/* take the previous prog_entry slot */
jmp_table.tail = PREV(jmp_table.tail);
prog_entry = &jmp_table.entries[jmp_table.tail];
} else {
/* take the next prog_entry slot */
prog_entry = &jmp_table.entries[jmp_table.head];
jmp_table.head = NEXT(jmp_table.head);
}
/* we steal the ref here */
prog_entry->prog = prog;
prog_entry->idx = prog_table_idx;
prog_entry->hdev = hdev;
prog_entry->type = prog_type;
/* finally store the index in the device list */
err = hid_bpf_populate_hdev(hdev, prog_type);
if (err) {
hid_bpf_release_prog_at(prog_table_idx);
goto err_unlock;
}
link->hid_table_index = prog_table_idx;
err = bpf_link_prime(&link->link, &link_primer);
if (err)
goto err_unlock;
mutex_unlock(&hid_bpf_attach_lock);
return bpf_link_settle(&link_primer);
err_unlock:
mutex_unlock(&hid_bpf_attach_lock);
bpf_prog_put(prog);
kfree(link);
return err;
}
void __hid_bpf_destroy_device(struct hid_device *hdev)
{
int type, i;
struct hid_bpf_prog_list *prog_list;
rcu_read_lock();
for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++) {
prog_list = rcu_dereference(hdev->bpf.progs[type]);
if (!prog_list)
continue;
for (i = 0; i < prog_list->prog_cnt; i++)
__clear_bit(prog_list->prog_idx[i], jmp_table.enabled);
}
rcu_read_unlock();
for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++)
__hid_bpf_set_hdev_progs(hdev, NULL, type);
/* schedule release of all detached progs */
schedule_work(&release_work);
}
#define HID_BPF_PROGS_COUNT 1
static struct bpf_link *links[HID_BPF_PROGS_COUNT];
static struct entrypoints_bpf *skel;
void hid_bpf_free_links_and_skel(void)
{
int i;
/* the following is enough to release all programs attached to hid */
if (jmp_table.map)
bpf_map_put_with_uref(jmp_table.map);
for (i = 0; i < ARRAY_SIZE(links); i++) {
if (!IS_ERR_OR_NULL(links[i]))
bpf_link_put(links[i]);
}
entrypoints_bpf__destroy(skel);
}
#define ATTACH_AND_STORE_LINK(__name) do { \
err = entrypoints_bpf__##__name##__attach(skel); \
if (err) \
goto out; \
\
links[idx] = bpf_link_get_from_fd(skel->links.__name##_fd); \
if (IS_ERR(links[idx])) { \
err = PTR_ERR(links[idx]); \
goto out; \
} \
\
/* Avoid taking over stdin/stdout/stderr of init process. Zeroing out \
* makes skel_closenz() a no-op later in iterators_bpf__destroy(). \
*/ \
close_fd(skel->links.__name##_fd); \
skel->links.__name##_fd = 0; \
idx++; \
} while (0)
int hid_bpf_preload_skel(void)
{
int err, idx = 0;
skel = entrypoints_bpf__open();
if (!skel)
return -ENOMEM;
err = entrypoints_bpf__load(skel);
if (err)
goto out;
jmp_table.map = bpf_map_get_with_uref(skel->maps.hid_jmp_table.map_fd);
if (IS_ERR(jmp_table.map)) {
err = PTR_ERR(jmp_table.map);
goto out;
}
ATTACH_AND_STORE_LINK(hid_tail_call);
return 0;
out:
hid_bpf_free_links_and_skel();
return err;
}
| linux-master | drivers/hid/bpf/hid_bpf_jmp_table.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* HID-BPF support for Linux
*
* Copyright (c) 2022 Benjamin Tissoires
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bitops.h>
#include <linux/btf.h>
#include <linux/btf_ids.h>
#include <linux/filter.h>
#include <linux/hid.h>
#include <linux/hid_bpf.h>
#include <linux/init.h>
#include <linux/kfifo.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/workqueue.h>
#include "hid_bpf_dispatch.h"
#include "entrypoints/entrypoints.lskel.h"
struct hid_bpf_ops *hid_bpf_ops;
EXPORT_SYMBOL(hid_bpf_ops);
/**
* hid_bpf_device_event - Called whenever an event is coming in from the device
*
* @ctx: The HID-BPF context
*
* @return %0 on success and keep processing; a positive value to change the
* incoming size buffer; a negative error code to interrupt the processing
* of this event
*
* Declare an %fmod_ret tracing bpf program to this function and attach this
* program through hid_bpf_attach_prog() to have this helper called for
* any incoming event from the device itself.
*
* The function is called while on IRQ context, so we can not sleep.
*/
/* never used by the kernel but declared so we can load and attach a tracepoint */
__weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
{
return 0;
}
u8 *
dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
u32 *size, int interrupt)
{
struct hid_bpf_ctx_kern ctx_kern = {
.ctx = {
.hid = hdev,
.report_type = type,
.allocated_size = hdev->bpf.allocated_data,
.size = *size,
},
.data = hdev->bpf.device_data,
};
int ret;
if (type >= HID_REPORT_TYPES)
return ERR_PTR(-EINVAL);
/* no program has been attached yet */
if (!hdev->bpf.device_data)
return data;
memset(ctx_kern.data, 0, hdev->bpf.allocated_data);
memcpy(ctx_kern.data, data, *size);
ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
if (ret < 0)
return ERR_PTR(ret);
if (ret) {
if (ret > ctx_kern.ctx.allocated_size)
return ERR_PTR(-EINVAL);
*size = ret;
}
return ctx_kern.data;
}
EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
/**
* hid_bpf_rdesc_fixup - Called when the probe function parses the report
* descriptor of the HID device
*
* @ctx: The HID-BPF context
*
* @return 0 on success and keep processing; a positive value to change the
* incoming size buffer; a negative error code to interrupt the processing
* of this event
*
* Declare an %fmod_ret tracing bpf program to this function and attach this
* program through hid_bpf_attach_prog() to have this helper called before any
* parsing of the report descriptor by HID.
*/
/* never used by the kernel but declared so we can load and attach a tracepoint */
__weak noinline int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx)
{
return 0;
}
u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size)
{
int ret;
struct hid_bpf_ctx_kern ctx_kern = {
.ctx = {
.hid = hdev,
.size = *size,
.allocated_size = HID_MAX_DESCRIPTOR_SIZE,
},
};
ctx_kern.data = kzalloc(ctx_kern.ctx.allocated_size, GFP_KERNEL);
if (!ctx_kern.data)
goto ignore_bpf;
memcpy(ctx_kern.data, rdesc, min_t(unsigned int, *size, HID_MAX_DESCRIPTOR_SIZE));
ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_RDESC_FIXUP, &ctx_kern);
if (ret < 0)
goto ignore_bpf;
if (ret) {
if (ret > ctx_kern.ctx.allocated_size)
goto ignore_bpf;
*size = ret;
}
rdesc = krealloc(ctx_kern.data, *size, GFP_KERNEL);
return rdesc;
ignore_bpf:
kfree(ctx_kern.data);
return kmemdup(rdesc, *size, GFP_KERNEL);
}
EXPORT_SYMBOL_GPL(call_hid_bpf_rdesc_fixup);
/**
* hid_bpf_get_data - Get the kernel memory pointer associated with the context @ctx
*
* @ctx: The HID-BPF context
* @offset: The offset within the memory
* @rdwr_buf_size: the const size of the buffer
*
* @returns %NULL on error, an %__u8 memory pointer on success
*/
noinline __u8 *
hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr_buf_size)
{
struct hid_bpf_ctx_kern *ctx_kern;
if (!ctx)
return NULL;
ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
if (rdwr_buf_size + offset > ctx->allocated_size)
return NULL;
return ctx_kern->data + offset;
}
/*
* The following set contains all functions we agree BPF programs
* can use.
*/
BTF_SET8_START(hid_bpf_kfunc_ids)
BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL)
BTF_SET8_END(hid_bpf_kfunc_ids)
static const struct btf_kfunc_id_set hid_bpf_kfunc_set = {
.owner = THIS_MODULE,
.set = &hid_bpf_kfunc_ids,
};
static int device_match_id(struct device *dev, const void *id)
{
struct hid_device *hdev = to_hid_device(dev);
return hdev->id == *(int *)id;
}
static int __hid_bpf_allocate_data(struct hid_device *hdev, u8 **data, u32 *size)
{
u8 *alloc_data;
unsigned int i, j, max_report_len = 0;
size_t alloc_size = 0;
/* compute the maximum report length for this device */
for (i = 0; i < HID_REPORT_TYPES; i++) {
struct hid_report_enum *report_enum = hdev->report_enum + i;
for (j = 0; j < HID_MAX_IDS; j++) {
struct hid_report *report = report_enum->report_id_hash[j];
if (report)
max_report_len = max(max_report_len, hid_report_len(report));
}
}
/*
* Give us a little bit of extra space and some predictability in the
* buffer length we create. This way, we can tell users that they can
* work on chunks of 64 bytes of memory without having the bpf verifier
* scream at them.
*/
alloc_size = DIV_ROUND_UP(max_report_len, 64) * 64;
alloc_data = kzalloc(alloc_size, GFP_KERNEL);
if (!alloc_data)
return -ENOMEM;
*data = alloc_data;
*size = alloc_size;
return 0;
}
static int hid_bpf_allocate_event_data(struct hid_device *hdev)
{
/* hdev->bpf.device_data is already allocated, abort */
if (hdev->bpf.device_data)
return 0;
return __hid_bpf_allocate_data(hdev, &hdev->bpf.device_data, &hdev->bpf.allocated_data);
}
int hid_bpf_reconnect(struct hid_device *hdev)
{
if (!test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status))
return device_reprobe(&hdev->dev);
return 0;
}
/**
* hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
*
* @hid_id: the system unique identifier of the HID device
* @prog_fd: an fd in the user process representing the program to attach
* @flags: any logical OR combination of &enum hid_bpf_attach_flags
*
* @returns an fd of a bpf_link object on success (> %0), an error code otherwise.
* Closing this fd will detach the program from the HID device (unless the bpf_link
* is pinned to the BPF file system).
*/
/* called from syscall */
noinline int
hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
{
struct hid_device *hdev;
struct device *dev;
int fd, err, prog_type = hid_bpf_get_prog_attach_type(prog_fd);
if (!hid_bpf_ops)
return -EINVAL;
if (prog_type < 0)
return prog_type;
if (prog_type >= HID_BPF_PROG_TYPE_MAX)
return -EINVAL;
if ((flags & ~HID_BPF_FLAG_MASK))
return -EINVAL;
dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id);
if (!dev)
return -EINVAL;
hdev = to_hid_device(dev);
if (prog_type == HID_BPF_PROG_TYPE_DEVICE_EVENT) {
err = hid_bpf_allocate_event_data(hdev);
if (err)
return err;
}
fd = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
if (fd < 0)
return fd;
if (prog_type == HID_BPF_PROG_TYPE_RDESC_FIXUP) {
err = hid_bpf_reconnect(hdev);
if (err) {
close_fd(fd);
return err;
}
}
return fd;
}
/**
* hid_bpf_allocate_context - Allocate a context to the given HID device
*
* @hid_id: the system unique identifier of the HID device
*
* @returns A pointer to &struct hid_bpf_ctx on success, %NULL on error.
*/
noinline struct hid_bpf_ctx *
hid_bpf_allocate_context(unsigned int hid_id)
{
struct hid_device *hdev;
struct hid_bpf_ctx_kern *ctx_kern = NULL;
struct device *dev;
if (!hid_bpf_ops)
return NULL;
dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id);
if (!dev)
return NULL;
hdev = to_hid_device(dev);
ctx_kern = kzalloc(sizeof(*ctx_kern), GFP_KERNEL);
if (!ctx_kern)
return NULL;
ctx_kern->ctx.hid = hdev;
return &ctx_kern->ctx;
}
/**
* hid_bpf_release_context - Release the previously allocated context @ctx
*
* @ctx: the HID-BPF context to release
*
*/
noinline void
hid_bpf_release_context(struct hid_bpf_ctx *ctx)
{
struct hid_bpf_ctx_kern *ctx_kern;
ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
kfree(ctx_kern);
}
/**
* hid_bpf_hw_request - Communicate with a HID device
*
* @ctx: the HID-BPF context previously allocated in hid_bpf_allocate_context()
* @buf: a %PTR_TO_MEM buffer
* @buf__sz: the size of the data to transfer
* @rtype: the type of the report (%HID_INPUT_REPORT, %HID_FEATURE_REPORT, %HID_OUTPUT_REPORT)
* @reqtype: the type of the request (%HID_REQ_GET_REPORT, %HID_REQ_SET_REPORT, ...)
*
* @returns %0 on success, a negative error code otherwise.
*/
noinline int
hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
enum hid_report_type rtype, enum hid_class_request reqtype)
{
struct hid_device *hdev;
struct hid_report *report;
struct hid_report_enum *report_enum;
u8 *dma_data;
u32 report_len;
int ret;
/* check arguments */
if (!ctx || !hid_bpf_ops || !buf)
return -EINVAL;
switch (rtype) {
case HID_INPUT_REPORT:
case HID_OUTPUT_REPORT:
case HID_FEATURE_REPORT:
break;
default:
return -EINVAL;
}
switch (reqtype) {
case HID_REQ_GET_REPORT:
case HID_REQ_GET_IDLE:
case HID_REQ_GET_PROTOCOL:
case HID_REQ_SET_REPORT:
case HID_REQ_SET_IDLE:
case HID_REQ_SET_PROTOCOL:
break;
default:
return -EINVAL;
}
if (buf__sz < 1)
return -EINVAL;
hdev = (struct hid_device *)ctx->hid; /* discard const */
report_enum = hdev->report_enum + rtype;
report = hid_bpf_ops->hid_get_report(report_enum, buf);
if (!report)
return -EINVAL;
report_len = hid_report_len(report);
if (buf__sz > report_len)
buf__sz = report_len;
dma_data = kmemdup(buf, buf__sz, GFP_KERNEL);
if (!dma_data)
return -ENOMEM;
ret = hid_bpf_ops->hid_hw_raw_request(hdev,
dma_data[0],
dma_data,
buf__sz,
rtype,
reqtype);
if (ret > 0)
memcpy(buf, dma_data, ret);
kfree(dma_data);
return ret;
}
/* our HID-BPF entrypoints */
BTF_SET8_START(hid_bpf_fmodret_ids)
BTF_ID_FLAGS(func, hid_bpf_device_event)
BTF_ID_FLAGS(func, hid_bpf_rdesc_fixup)
BTF_ID_FLAGS(func, __hid_bpf_tail_call)
BTF_SET8_END(hid_bpf_fmodret_ids)
static const struct btf_kfunc_id_set hid_bpf_fmodret_set = {
.owner = THIS_MODULE,
.set = &hid_bpf_fmodret_ids,
};
/* for syscall HID-BPF */
BTF_SET8_START(hid_bpf_syscall_kfunc_ids)
BTF_ID_FLAGS(func, hid_bpf_attach_prog)
BTF_ID_FLAGS(func, hid_bpf_allocate_context, KF_ACQUIRE | KF_RET_NULL)
BTF_ID_FLAGS(func, hid_bpf_release_context, KF_RELEASE)
BTF_ID_FLAGS(func, hid_bpf_hw_request)
BTF_SET8_END(hid_bpf_syscall_kfunc_ids)
static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
.owner = THIS_MODULE,
.set = &hid_bpf_syscall_kfunc_ids,
};
int hid_bpf_connect_device(struct hid_device *hdev)
{
struct hid_bpf_prog_list *prog_list;
rcu_read_lock();
prog_list = rcu_dereference(hdev->bpf.progs[HID_BPF_PROG_TYPE_DEVICE_EVENT]);
rcu_read_unlock();
/* only allocate BPF data if there are programs attached */
if (!prog_list)
return 0;
return hid_bpf_allocate_event_data(hdev);
}
EXPORT_SYMBOL_GPL(hid_bpf_connect_device);
void hid_bpf_disconnect_device(struct hid_device *hdev)
{
kfree(hdev->bpf.device_data);
hdev->bpf.device_data = NULL;
hdev->bpf.allocated_data = 0;
}
EXPORT_SYMBOL_GPL(hid_bpf_disconnect_device);
void hid_bpf_destroy_device(struct hid_device *hdev)
{
if (!hdev)
return;
/* mark the device as destroyed in bpf so we don't reattach it */
hdev->bpf.destroyed = true;
__hid_bpf_destroy_device(hdev);
}
EXPORT_SYMBOL_GPL(hid_bpf_destroy_device);
void hid_bpf_device_init(struct hid_device *hdev)
{
spin_lock_init(&hdev->bpf.progs_lock);
}
EXPORT_SYMBOL_GPL(hid_bpf_device_init);
static int __init hid_bpf_init(void)
{
int err;
/* Note: if we exit with an error any time here, we would entirely break HID, which
* is probably not something we want. So we log an error and return success.
*
* This is not a big deal: the syscall allowing to attach a BPF program to a HID device
* will not be available, so nobody will be able to use the functionality.
*/
err = register_btf_fmodret_id_set(&hid_bpf_fmodret_set);
if (err) {
pr_warn("error while registering fmodret entrypoints: %d", err);
return 0;
}
err = hid_bpf_preload_skel();
if (err) {
pr_warn("error while preloading HID BPF dispatcher: %d", err);
return 0;
}
/* register tracing kfuncs after we are sure we can load our preloaded bpf program */
err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
if (err) {
pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
return 0;
}
/* register syscalls after we are sure we can load our preloaded bpf program */
err = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &hid_bpf_syscall_kfunc_set);
if (err) {
pr_warn("error while setting HID BPF syscall kfuncs: %d", err);
return 0;
}
return 0;
}
static void __exit hid_bpf_exit(void)
{
/* HID depends on us, so if we hit that code, we are guaranteed that hid
* has been removed and thus we do not need to clear the HID devices
*/
hid_bpf_free_links_and_skel();
}
late_initcall(hid_bpf_init);
module_exit(hid_bpf_exit);
MODULE_AUTHOR("Benjamin Tissoires");
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/bpf/hid_bpf_dispatch.c |
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Benjamin Tissoires */
#include ".output/vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#define HID_BPF_MAX_PROGS 1024
struct {
__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
__uint(max_entries, HID_BPF_MAX_PROGS);
__uint(key_size, sizeof(__u32));
__uint(value_size, sizeof(__u32));
} hid_jmp_table SEC(".maps");
SEC("fmod_ret/__hid_bpf_tail_call")
int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
{
bpf_tail_call(ctx, &hid_jmp_table, hctx->index);
return 0;
}
char LICENSE[] SEC("license") = "GPL";
| linux-master | drivers/hid/bpf/entrypoints/entrypoints.bpf.c |
/*
* HID over I2C Open Firmware Subclass
*
* Copyright (c) 2012 Benjamin Tissoires <[email protected]>
* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
* Copyright (c) 2012 Red Hat, Inc
*
* This code was forked out of the core code, which was partly based on
* "USB HID support for Linux":
*
* Copyright (c) 1999 Andreas Gal
* Copyright (c) 2000-2005 Vojtech Pavlik <[email protected]>
* Copyright (c) 2005 Michael Haboustak <[email protected]> for Concept2, Inc
* Copyright (c) 2007-2008 Oliver Neukum
* Copyright (c) 2006-2010 Jiri Kosina
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/hid.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/regulator/consumer.h>
#include "i2c-hid.h"
struct i2c_hid_of {
struct i2chid_ops ops;
struct i2c_client *client;
struct gpio_desc *reset_gpio;
struct regulator_bulk_data supplies[2];
int post_power_delay_ms;
int post_reset_delay_ms;
};
static int i2c_hid_of_power_up(struct i2chid_ops *ops)
{
struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
struct device *dev = &ihid_of->client->dev;
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ihid_of->supplies),
ihid_of->supplies);
if (ret) {
dev_warn(dev, "Failed to enable supplies: %d\n", ret);
return ret;
}
if (ihid_of->post_power_delay_ms)
msleep(ihid_of->post_power_delay_ms);
gpiod_set_value_cansleep(ihid_of->reset_gpio, 0);
if (ihid_of->post_reset_delay_ms)
msleep(ihid_of->post_reset_delay_ms);
return 0;
}
static void i2c_hid_of_power_down(struct i2chid_ops *ops)
{
struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
gpiod_set_value_cansleep(ihid_of->reset_gpio, 1);
regulator_bulk_disable(ARRAY_SIZE(ihid_of->supplies),
ihid_of->supplies);
}
static int i2c_hid_of_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct i2c_hid_of *ihid_of;
u16 hid_descriptor_address;
u32 quirks = 0;
int ret;
u32 val;
ihid_of = devm_kzalloc(dev, sizeof(*ihid_of), GFP_KERNEL);
if (!ihid_of)
return -ENOMEM;
ihid_of->ops.power_up = i2c_hid_of_power_up;
ihid_of->ops.power_down = i2c_hid_of_power_down;
ret = device_property_read_u32(dev, "hid-descr-addr", &val);
if (ret) {
dev_err(dev, "HID register address not provided\n");
return -ENODEV;
}
if (val >> 16) {
dev_err(dev, "Bad HID register address: 0x%08x\n", val);
return -EINVAL;
}
hid_descriptor_address = val;
if (!device_property_read_u32(dev, "post-power-on-delay-ms", &val))
ihid_of->post_power_delay_ms = val;
/*
* Note this is a kernel internal device-property set by x86 platform code,
* this MUST not be used in devicetree files without first adding it to
* the DT bindings.
*/
if (!device_property_read_u32(dev, "post-reset-deassert-delay-ms", &val))
ihid_of->post_reset_delay_ms = val;
/* Start out with reset asserted */
ihid_of->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ihid_of->reset_gpio))
return PTR_ERR(ihid_of->reset_gpio);
ihid_of->supplies[0].supply = "vdd";
ihid_of->supplies[1].supply = "vddl";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ihid_of->supplies),
ihid_of->supplies);
if (ret)
return ret;
if (device_property_read_bool(dev, "touchscreen-inverted-x"))
quirks |= HID_QUIRK_X_INVERT;
if (device_property_read_bool(dev, "touchscreen-inverted-y"))
quirks |= HID_QUIRK_Y_INVERT;
return i2c_hid_core_probe(client, &ihid_of->ops,
hid_descriptor_address, quirks);
}
#ifdef CONFIG_OF
static const struct of_device_id i2c_hid_of_match[] = {
{ .compatible = "hid-over-i2c" },
{},
};
MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
#endif
static const struct i2c_device_id i2c_hid_of_id_table[] = {
{ "hid", 0 },
{ "hid-over-i2c", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, i2c_hid_of_id_table);
static struct i2c_driver i2c_hid_of_driver = {
.driver = {
.name = "i2c_hid_of",
.pm = &i2c_hid_core_pm,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(i2c_hid_of_match),
},
.probe = i2c_hid_of_probe,
.remove = i2c_hid_core_remove,
.shutdown = i2c_hid_core_shutdown,
.id_table = i2c_hid_of_id_table,
};
module_i2c_driver(i2c_hid_of_driver);
MODULE_DESCRIPTION("HID over I2C OF driver");
MODULE_AUTHOR("Benjamin Tissoires <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/i2c-hid/i2c-hid-of.c |
// SPDX-License-Identifier: GPL-2.0+
/*
* Quirks for I2C-HID devices that do not supply proper descriptors
*
* Copyright (c) 2018 Julian Sax <[email protected]>
*
*/
#include <linux/types.h>
#include <linux/dmi.h>
#include <linux/mod_devicetable.h>
#include <linux/hid.h>
#include "i2c-hid.h"
#include "../hid-ids.h"
struct i2c_hid_desc_override {
union {
struct i2c_hid_desc *i2c_hid_desc;
uint8_t *i2c_hid_desc_buffer;
};
uint8_t *hid_report_desc;
unsigned int hid_report_desc_size;
uint8_t *i2c_name;
};
/*
* descriptors for the SIPODEV SP1064 touchpad
*
* This device does not supply any descriptors and on windows a filter
* driver operates between the i2c-hid layer and the device and injects
* these descriptors when the device is prompted. The descriptors were
* extracted by listening to the i2c-hid traffic that occurs between the
* windows filter driver and the windows i2c-hid driver.
*/
static const struct i2c_hid_desc_override sipodev_desc = {
.i2c_hid_desc_buffer = (uint8_t [])
{0x1e, 0x00, /* Length of descriptor */
0x00, 0x01, /* Version of descriptor */
0xdb, 0x01, /* Length of report descriptor */
0x21, 0x00, /* Location of report descriptor */
0x24, 0x00, /* Location of input report */
0x1b, 0x00, /* Max input report length */
0x25, 0x00, /* Location of output report */
0x11, 0x00, /* Max output report length */
0x22, 0x00, /* Location of command register */
0x23, 0x00, /* Location of data register */
0x11, 0x09, /* Vendor ID */
0x88, 0x52, /* Product ID */
0x06, 0x00, /* Version ID */
0x00, 0x00, 0x00, 0x00 /* Reserved */
},
.hid_report_desc = (uint8_t [])
{0x05, 0x01, /* Usage Page (Desktop), */
0x09, 0x02, /* Usage (Mouse), */
0xA1, 0x01, /* Collection (Application), */
0x85, 0x01, /* Report ID (1), */
0x09, 0x01, /* Usage (Pointer), */
0xA1, 0x00, /* Collection (Physical), */
0x05, 0x09, /* Usage Page (Button), */
0x19, 0x01, /* Usage Minimum (01h), */
0x29, 0x02, /* Usage Maximum (02h), */
0x25, 0x01, /* Logical Maximum (1), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x02, /* Report Count (2), */
0x81, 0x02, /* Input (Variable), */
0x95, 0x06, /* Report Count (6), */
0x81, 0x01, /* Input (Constant), */
0x05, 0x01, /* Usage Page (Desktop), */
0x09, 0x30, /* Usage (X), */
0x09, 0x31, /* Usage (Y), */
0x15, 0x81, /* Logical Minimum (-127), */
0x25, 0x7F, /* Logical Maximum (127), */
0x75, 0x08, /* Report Size (8), */
0x95, 0x02, /* Report Count (2), */
0x81, 0x06, /* Input (Variable, Relative), */
0xC0, /* End Collection, */
0xC0, /* End Collection, */
0x05, 0x0D, /* Usage Page (Digitizer), */
0x09, 0x05, /* Usage (Touchpad), */
0xA1, 0x01, /* Collection (Application), */
0x85, 0x04, /* Report ID (4), */
0x05, 0x0D, /* Usage Page (Digitizer), */
0x09, 0x22, /* Usage (Finger), */
0xA1, 0x02, /* Collection (Logical), */
0x15, 0x00, /* Logical Minimum (0), */
0x25, 0x01, /* Logical Maximum (1), */
0x09, 0x47, /* Usage (Touch Valid), */
0x09, 0x42, /* Usage (Tip Switch), */
0x95, 0x02, /* Report Count (2), */
0x75, 0x01, /* Report Size (1), */
0x81, 0x02, /* Input (Variable), */
0x95, 0x01, /* Report Count (1), */
0x75, 0x03, /* Report Size (3), */
0x25, 0x05, /* Logical Maximum (5), */
0x09, 0x51, /* Usage (Contact Identifier), */
0x81, 0x02, /* Input (Variable), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x03, /* Input (Constant, Variable), */
0x05, 0x01, /* Usage Page (Desktop), */
0x26, 0x44, 0x0A, /* Logical Maximum (2628), */
0x75, 0x10, /* Report Size (16), */
0x55, 0x0E, /* Unit Exponent (14), */
0x65, 0x11, /* Unit (Centimeter), */
0x09, 0x30, /* Usage (X), */
0x46, 0x1A, 0x04, /* Physical Maximum (1050), */
0x95, 0x01, /* Report Count (1), */
0x81, 0x02, /* Input (Variable), */
0x46, 0xBC, 0x02, /* Physical Maximum (700), */
0x26, 0x34, 0x05, /* Logical Maximum (1332), */
0x09, 0x31, /* Usage (Y), */
0x81, 0x02, /* Input (Variable), */
0xC0, /* End Collection, */
0x05, 0x0D, /* Usage Page (Digitizer), */
0x09, 0x22, /* Usage (Finger), */
0xA1, 0x02, /* Collection (Logical), */
0x25, 0x01, /* Logical Maximum (1), */
0x09, 0x47, /* Usage (Touch Valid), */
0x09, 0x42, /* Usage (Tip Switch), */
0x95, 0x02, /* Report Count (2), */
0x75, 0x01, /* Report Size (1), */
0x81, 0x02, /* Input (Variable), */
0x95, 0x01, /* Report Count (1), */
0x75, 0x03, /* Report Size (3), */
0x25, 0x05, /* Logical Maximum (5), */
0x09, 0x51, /* Usage (Contact Identifier), */
0x81, 0x02, /* Input (Variable), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x03, /* Input (Constant, Variable), */
0x05, 0x01, /* Usage Page (Desktop), */
0x26, 0x44, 0x0A, /* Logical Maximum (2628), */
0x75, 0x10, /* Report Size (16), */
0x09, 0x30, /* Usage (X), */
0x46, 0x1A, 0x04, /* Physical Maximum (1050), */
0x95, 0x01, /* Report Count (1), */
0x81, 0x02, /* Input (Variable), */
0x46, 0xBC, 0x02, /* Physical Maximum (700), */
0x26, 0x34, 0x05, /* Logical Maximum (1332), */
0x09, 0x31, /* Usage (Y), */
0x81, 0x02, /* Input (Variable), */
0xC0, /* End Collection, */
0x05, 0x0D, /* Usage Page (Digitizer), */
0x09, 0x22, /* Usage (Finger), */
0xA1, 0x02, /* Collection (Logical), */
0x25, 0x01, /* Logical Maximum (1), */
0x09, 0x47, /* Usage (Touch Valid), */
0x09, 0x42, /* Usage (Tip Switch), */
0x95, 0x02, /* Report Count (2), */
0x75, 0x01, /* Report Size (1), */
0x81, 0x02, /* Input (Variable), */
0x95, 0x01, /* Report Count (1), */
0x75, 0x03, /* Report Size (3), */
0x25, 0x05, /* Logical Maximum (5), */
0x09, 0x51, /* Usage (Contact Identifier), */
0x81, 0x02, /* Input (Variable), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x03, /* Input (Constant, Variable), */
0x05, 0x01, /* Usage Page (Desktop), */
0x26, 0x44, 0x0A, /* Logical Maximum (2628), */
0x75, 0x10, /* Report Size (16), */
0x09, 0x30, /* Usage (X), */
0x46, 0x1A, 0x04, /* Physical Maximum (1050), */
0x95, 0x01, /* Report Count (1), */
0x81, 0x02, /* Input (Variable), */
0x46, 0xBC, 0x02, /* Physical Maximum (700), */
0x26, 0x34, 0x05, /* Logical Maximum (1332), */
0x09, 0x31, /* Usage (Y), */
0x81, 0x02, /* Input (Variable), */
0xC0, /* End Collection, */
0x05, 0x0D, /* Usage Page (Digitizer), */
0x09, 0x22, /* Usage (Finger), */
0xA1, 0x02, /* Collection (Logical), */
0x25, 0x01, /* Logical Maximum (1), */
0x09, 0x47, /* Usage (Touch Valid), */
0x09, 0x42, /* Usage (Tip Switch), */
0x95, 0x02, /* Report Count (2), */
0x75, 0x01, /* Report Size (1), */
0x81, 0x02, /* Input (Variable), */
0x95, 0x01, /* Report Count (1), */
0x75, 0x03, /* Report Size (3), */
0x25, 0x05, /* Logical Maximum (5), */
0x09, 0x51, /* Usage (Contact Identifier), */
0x81, 0x02, /* Input (Variable), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x03, /* Input (Constant, Variable), */
0x05, 0x01, /* Usage Page (Desktop), */
0x26, 0x44, 0x0A, /* Logical Maximum (2628), */
0x75, 0x10, /* Report Size (16), */
0x09, 0x30, /* Usage (X), */
0x46, 0x1A, 0x04, /* Physical Maximum (1050), */
0x95, 0x01, /* Report Count (1), */
0x81, 0x02, /* Input (Variable), */
0x46, 0xBC, 0x02, /* Physical Maximum (700), */
0x26, 0x34, 0x05, /* Logical Maximum (1332), */
0x09, 0x31, /* Usage (Y), */
0x81, 0x02, /* Input (Variable), */
0xC0, /* End Collection, */
0x05, 0x0D, /* Usage Page (Digitizer), */
0x55, 0x0C, /* Unit Exponent (12), */
0x66, 0x01, 0x10, /* Unit (Seconds), */
0x47, 0xFF, 0xFF, 0x00, 0x00,/* Physical Maximum (65535), */
0x27, 0xFF, 0xFF, 0x00, 0x00,/* Logical Maximum (65535), */
0x75, 0x10, /* Report Size (16), */
0x95, 0x01, /* Report Count (1), */
0x09, 0x56, /* Usage (Scan Time), */
0x81, 0x02, /* Input (Variable), */
0x09, 0x54, /* Usage (Contact Count), */
0x25, 0x7F, /* Logical Maximum (127), */
0x75, 0x08, /* Report Size (8), */
0x81, 0x02, /* Input (Variable), */
0x05, 0x09, /* Usage Page (Button), */
0x09, 0x01, /* Usage (01h), */
0x25, 0x01, /* Logical Maximum (1), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x01, /* Report Count (1), */
0x81, 0x02, /* Input (Variable), */
0x95, 0x07, /* Report Count (7), */
0x81, 0x03, /* Input (Constant, Variable), */
0x05, 0x0D, /* Usage Page (Digitizer), */
0x85, 0x02, /* Report ID (2), */
0x09, 0x55, /* Usage (Contact Count Maximum), */
0x09, 0x59, /* Usage (59h), */
0x75, 0x04, /* Report Size (4), */
0x95, 0x02, /* Report Count (2), */
0x25, 0x0F, /* Logical Maximum (15), */
0xB1, 0x02, /* Feature (Variable), */
0x05, 0x0D, /* Usage Page (Digitizer), */
0x85, 0x07, /* Report ID (7), */
0x09, 0x60, /* Usage (60h), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x01, /* Report Count (1), */
0x25, 0x01, /* Logical Maximum (1), */
0xB1, 0x02, /* Feature (Variable), */
0x95, 0x07, /* Report Count (7), */
0xB1, 0x03, /* Feature (Constant, Variable), */
0x85, 0x06, /* Report ID (6), */
0x06, 0x00, 0xFF, /* Usage Page (FF00h), */
0x09, 0xC5, /* Usage (C5h), */
0x26, 0xFF, 0x00, /* Logical Maximum (255), */
0x75, 0x08, /* Report Size (8), */
0x96, 0x00, 0x01, /* Report Count (256), */
0xB1, 0x02, /* Feature (Variable), */
0xC0, /* End Collection, */
0x06, 0x00, 0xFF, /* Usage Page (FF00h), */
0x09, 0x01, /* Usage (01h), */
0xA1, 0x01, /* Collection (Application), */
0x85, 0x0D, /* Report ID (13), */
0x26, 0xFF, 0x00, /* Logical Maximum (255), */
0x19, 0x01, /* Usage Minimum (01h), */
0x29, 0x02, /* Usage Maximum (02h), */
0x75, 0x08, /* Report Size (8), */
0x95, 0x02, /* Report Count (2), */
0xB1, 0x02, /* Feature (Variable), */
0xC0, /* End Collection, */
0x05, 0x0D, /* Usage Page (Digitizer), */
0x09, 0x0E, /* Usage (Configuration), */
0xA1, 0x01, /* Collection (Application), */
0x85, 0x03, /* Report ID (3), */
0x09, 0x22, /* Usage (Finger), */
0xA1, 0x02, /* Collection (Logical), */
0x09, 0x52, /* Usage (Device Mode), */
0x25, 0x0A, /* Logical Maximum (10), */
0x95, 0x01, /* Report Count (1), */
0xB1, 0x02, /* Feature (Variable), */
0xC0, /* End Collection, */
0x09, 0x22, /* Usage (Finger), */
0xA1, 0x00, /* Collection (Physical), */
0x85, 0x05, /* Report ID (5), */
0x09, 0x57, /* Usage (57h), */
0x09, 0x58, /* Usage (58h), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x02, /* Report Count (2), */
0x25, 0x01, /* Logical Maximum (1), */
0xB1, 0x02, /* Feature (Variable), */
0x95, 0x06, /* Report Count (6), */
0xB1, 0x03, /* Feature (Constant, Variable),*/
0xC0, /* End Collection, */
0xC0 /* End Collection */
},
.hid_report_desc_size = 475,
.i2c_name = "SYNA3602:00"
};
static const struct dmi_system_id i2c_hid_dmi_desc_override_table[] = {
{
.ident = "Teclast F6 Pro",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TECLAST"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "F6 Pro"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Teclast F7",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TECLAST"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "F7"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Trekstor Primebook C13",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C13"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Trekstor Primebook C11",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C11"),
},
.driver_data = (void *)&sipodev_desc
},
{
/*
* There are at least 2 Primebook C11B versions, the older
* version has a product-name of "Primebook C11B", and a
* bios version / release / firmware revision of:
* V2.1.2 / 05/03/2018 / 18.2
* The new version has "PRIMEBOOK C11B" as product-name and a
* bios version / release / firmware revision of:
* CFALKSW05_BIOS_V1.1.2 / 11/19/2018 / 19.2
* Only the older version needs this quirk, note the newer
* version will not match as it has a different product-name.
*/
.ident = "Trekstor Primebook C11B",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C11B"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Trekstor SURFBOOK E11B",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "SURFBOOK E11B"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Direkt-Tek DTLAPY116-2",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Direkt-Tek"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "DTLAPY116-2"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Direkt-Tek DTLAPY133-1",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Direkt-Tek"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "DTLAPY133-1"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Mediacom Flexbook Edge 11",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "MEDIACOM"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "FlexBook edge11 - M-FBE11"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Mediacom FlexBook edge 13",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "MEDIACOM"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "FlexBook_edge13-M-FBE13"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Odys Winbook 13",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "AXDIA International GmbH"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "WINBOOK 13"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "iBall Aer3",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "iBall"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Aer3"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Schneider SCL142ALM",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "SCHNEIDER"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "SCL142ALM"),
},
.driver_data = (void *)&sipodev_desc
},
{
.ident = "Vero K147",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "VERO"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "K147"),
},
.driver_data = (void *)&sipodev_desc
},
{ } /* Terminate list */
};
static const struct hid_device_id i2c_hid_elan_flipped_quirks = {
HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8, USB_VENDOR_ID_ELAN, 0x2dcd),
HID_QUIRK_X_INVERT | HID_QUIRK_Y_INVERT
};
/*
* This list contains devices which have specific issues based on the system
* they're on and not just the device itself. The driver_data will have a
* specific hid device to match against.
*/
static const struct dmi_system_id i2c_hid_dmi_quirk_table[] = {
{
.ident = "DynaBook K50/FR",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dynabook Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "dynabook K50/FR"),
},
.driver_data = (void *)&i2c_hid_elan_flipped_quirks,
},
{ } /* Terminate list */
};
struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
{
struct i2c_hid_desc_override *override;
const struct dmi_system_id *system_id;
system_id = dmi_first_match(i2c_hid_dmi_desc_override_table);
if (!system_id)
return NULL;
override = system_id->driver_data;
if (strcmp(override->i2c_name, i2c_name))
return NULL;
return override->i2c_hid_desc;
}
char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
unsigned int *size)
{
struct i2c_hid_desc_override *override;
const struct dmi_system_id *system_id;
system_id = dmi_first_match(i2c_hid_dmi_desc_override_table);
if (!system_id)
return NULL;
override = system_id->driver_data;
if (strcmp(override->i2c_name, i2c_name))
return NULL;
*size = override->hid_report_desc_size;
return override->hid_report_desc;
}
u32 i2c_hid_get_dmi_quirks(const u16 vendor, const u16 product)
{
u32 quirks = 0;
const struct dmi_system_id *system_id =
dmi_first_match(i2c_hid_dmi_quirk_table);
if (system_id) {
const struct hid_device_id *device_id =
(struct hid_device_id *)(system_id->driver_data);
if (device_id && device_id->vendor == vendor &&
device_id->product == product)
quirks = device_id->driver_data;
}
return quirks;
}
| linux-master | drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Goodix touchscreens that use the i2c-hid protocol.
*
* Copyright 2020 Google LLC
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/regulator/consumer.h>
#include "i2c-hid.h"
struct goodix_i2c_hid_timing_data {
unsigned int post_gpio_reset_delay_ms;
unsigned int post_power_delay_ms;
};
struct i2c_hid_of_goodix {
struct i2chid_ops ops;
struct regulator *vdd;
struct regulator *vddio;
struct gpio_desc *reset_gpio;
bool no_reset_during_suspend;
const struct goodix_i2c_hid_timing_data *timings;
};
static int goodix_i2c_hid_power_up(struct i2chid_ops *ops)
{
struct i2c_hid_of_goodix *ihid_goodix =
container_of(ops, struct i2c_hid_of_goodix, ops);
int ret;
/*
* We assert reset GPIO here (instead of during power-down) to ensure
* the device will have a clean state after powering up, just like the
* normal scenarios will have.
*/
if (ihid_goodix->no_reset_during_suspend)
gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);
ret = regulator_enable(ihid_goodix->vdd);
if (ret)
return ret;
ret = regulator_enable(ihid_goodix->vddio);
if (ret)
return ret;
if (ihid_goodix->timings->post_power_delay_ms)
msleep(ihid_goodix->timings->post_power_delay_ms);
gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 0);
if (ihid_goodix->timings->post_gpio_reset_delay_ms)
msleep(ihid_goodix->timings->post_gpio_reset_delay_ms);
return 0;
}
static void goodix_i2c_hid_power_down(struct i2chid_ops *ops)
{
struct i2c_hid_of_goodix *ihid_goodix =
container_of(ops, struct i2c_hid_of_goodix, ops);
if (!ihid_goodix->no_reset_during_suspend)
gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);
regulator_disable(ihid_goodix->vddio);
regulator_disable(ihid_goodix->vdd);
}
static int i2c_hid_of_goodix_probe(struct i2c_client *client)
{
struct i2c_hid_of_goodix *ihid_goodix;
ihid_goodix = devm_kzalloc(&client->dev, sizeof(*ihid_goodix),
GFP_KERNEL);
if (!ihid_goodix)
return -ENOMEM;
ihid_goodix->ops.power_up = goodix_i2c_hid_power_up;
ihid_goodix->ops.power_down = goodix_i2c_hid_power_down;
/* Start out with reset asserted */
ihid_goodix->reset_gpio =
devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ihid_goodix->reset_gpio))
return PTR_ERR(ihid_goodix->reset_gpio);
ihid_goodix->vdd = devm_regulator_get(&client->dev, "vdd");
if (IS_ERR(ihid_goodix->vdd))
return PTR_ERR(ihid_goodix->vdd);
ihid_goodix->vddio = devm_regulator_get(&client->dev, "mainboard-vddio");
if (IS_ERR(ihid_goodix->vddio))
return PTR_ERR(ihid_goodix->vddio);
ihid_goodix->no_reset_during_suspend =
of_property_read_bool(client->dev.of_node, "goodix,no-reset-during-suspend");
ihid_goodix->timings = device_get_match_data(&client->dev);
return i2c_hid_core_probe(client, &ihid_goodix->ops, 0x0001, 0);
}
static const struct goodix_i2c_hid_timing_data goodix_gt7375p_timing_data = {
.post_power_delay_ms = 10,
.post_gpio_reset_delay_ms = 180,
};
static const struct of_device_id goodix_i2c_hid_of_match[] = {
{ .compatible = "goodix,gt7375p", .data = &goodix_gt7375p_timing_data },
{ }
};
MODULE_DEVICE_TABLE(of, goodix_i2c_hid_of_match);
static struct i2c_driver goodix_i2c_hid_ts_driver = {
.driver = {
.name = "i2c_hid_of_goodix",
.pm = &i2c_hid_core_pm,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(goodix_i2c_hid_of_match),
},
.probe = i2c_hid_of_goodix_probe,
.remove = i2c_hid_core_remove,
.shutdown = i2c_hid_core_shutdown,
};
module_i2c_driver(goodix_i2c_hid_ts_driver);
MODULE_AUTHOR("Douglas Anderson <[email protected]>");
MODULE_DESCRIPTION("Goodix i2c-hid touchscreen driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/hid/i2c-hid/i2c-hid-of-goodix.c |
/*
* HID over I2C ACPI Subclass
*
* Copyright (c) 2012 Benjamin Tissoires <[email protected]>
* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
* Copyright (c) 2012 Red Hat, Inc
*
* This code was forked out of the core code, which was partly based on
* "USB HID support for Linux":
*
* Copyright (c) 1999 Andreas Gal
* Copyright (c) 2000-2005 Vojtech Pavlik <[email protected]>
* Copyright (c) 2005 Michael Haboustak <[email protected]> for Concept2, Inc
* Copyright (c) 2007-2008 Oliver Neukum
* Copyright (c) 2006-2010 Jiri Kosina
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/uuid.h>
#include "i2c-hid.h"
struct i2c_hid_acpi {
struct i2chid_ops ops;
struct acpi_device *adev;
};
static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
/*
* The CHPN0001 ACPI device, which is used to describe the Chipone
* ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
*/
{ "CHPN0001" },
{ }
};
/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
static guid_t i2c_hid_guid =
GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
static int i2c_hid_acpi_get_descriptor(struct i2c_hid_acpi *ihid_acpi)
{
struct acpi_device *adev = ihid_acpi->adev;
acpi_handle handle = acpi_device_handle(adev);
union acpi_object *obj;
u16 hid_descriptor_address;
if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
return -ENODEV;
obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
ACPI_TYPE_INTEGER);
if (!obj) {
acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n");
return -ENODEV;
}
hid_descriptor_address = obj->integer.value;
ACPI_FREE(obj);
return hid_descriptor_address;
}
static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
{
struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops);
acpi_device_set_power(ihid_acpi->adev, ACPI_STATE_D3_COLD);
}
static int i2c_hid_acpi_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct i2c_hid_acpi *ihid_acpi;
u16 hid_descriptor_address;
int ret;
ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL);
if (!ihid_acpi)
return -ENOMEM;
ihid_acpi->adev = ACPI_COMPANION(dev);
ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail;
ret = i2c_hid_acpi_get_descriptor(ihid_acpi);
if (ret < 0)
return ret;
hid_descriptor_address = ret;
acpi_device_fix_up_power(ihid_acpi->adev);
return i2c_hid_core_probe(client, &ihid_acpi->ops,
hid_descriptor_address, 0);
}
static const struct acpi_device_id i2c_hid_acpi_match[] = {
{ "ACPI0C50" },
{ "PNP0C50" },
{ }
};
MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
static struct i2c_driver i2c_hid_acpi_driver = {
.driver = {
.name = "i2c_hid_acpi",
.pm = &i2c_hid_core_pm,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.acpi_match_table = i2c_hid_acpi_match,
},
.probe = i2c_hid_acpi_probe,
.remove = i2c_hid_core_remove,
.shutdown = i2c_hid_core_shutdown,
};
module_i2c_driver(i2c_hid_acpi_driver);
MODULE_DESCRIPTION("HID over I2C ACPI driver");
MODULE_AUTHOR("Benjamin Tissoires <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/i2c-hid/i2c-hid-acpi.c |
/*
* HID over I2C protocol implementation
*
* Copyright (c) 2012 Benjamin Tissoires <[email protected]>
* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
* Copyright (c) 2012 Red Hat, Inc
*
* This code is partly based on "USB HID support for Linux":
*
* Copyright (c) 1999 Andreas Gal
* Copyright (c) 2000-2005 Vojtech Pavlik <[email protected]>
* Copyright (c) 2005 Michael Haboustak <[email protected]> for Concept2, Inc
* Copyright (c) 2007-2008 Oliver Neukum
* Copyright (c) 2006-2010 Jiri Kosina
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/pm.h>
#include <linux/pm_wakeirq.h>
#include <linux/device.h>
#include <linux/wait.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/hid.h>
#include <linux/mutex.h>
#include <asm/unaligned.h>
#include <drm/drm_panel.h>
#include "../hid-ids.h"
#include "i2c-hid.h"
/* quirks to control the device */
#define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV BIT(0)
#define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET BIT(1)
#define I2C_HID_QUIRK_BOGUS_IRQ BIT(4)
#define I2C_HID_QUIRK_RESET_ON_RESUME BIT(5)
#define I2C_HID_QUIRK_BAD_INPUT_SIZE BIT(6)
#define I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET BIT(7)
/* Command opcodes */
#define I2C_HID_OPCODE_RESET 0x01
#define I2C_HID_OPCODE_GET_REPORT 0x02
#define I2C_HID_OPCODE_SET_REPORT 0x03
#define I2C_HID_OPCODE_GET_IDLE 0x04
#define I2C_HID_OPCODE_SET_IDLE 0x05
#define I2C_HID_OPCODE_GET_PROTOCOL 0x06
#define I2C_HID_OPCODE_SET_PROTOCOL 0x07
#define I2C_HID_OPCODE_SET_POWER 0x08
/* flags */
#define I2C_HID_STARTED 0
#define I2C_HID_RESET_PENDING 1
#define I2C_HID_READ_PENDING 2
#define I2C_HID_PWR_ON 0x00
#define I2C_HID_PWR_SLEEP 0x01
#define i2c_hid_dbg(ihid, ...) dev_dbg(&(ihid)->client->dev, __VA_ARGS__)
struct i2c_hid_desc {
__le16 wHIDDescLength;
__le16 bcdVersion;
__le16 wReportDescLength;
__le16 wReportDescRegister;
__le16 wInputRegister;
__le16 wMaxInputLength;
__le16 wOutputRegister;
__le16 wMaxOutputLength;
__le16 wCommandRegister;
__le16 wDataRegister;
__le16 wVendorID;
__le16 wProductID;
__le16 wVersionID;
__le32 reserved;
} __packed;
/* The main device structure */
struct i2c_hid {
struct i2c_client *client; /* i2c client */
struct hid_device *hid; /* pointer to corresponding HID dev */
struct i2c_hid_desc hdesc; /* the HID Descriptor */
__le16 wHIDDescRegister; /* location of the i2c
* register of the HID
* descriptor. */
unsigned int bufsize; /* i2c buffer size */
u8 *inbuf; /* Input buffer */
u8 *rawbuf; /* Raw Input buffer */
u8 *cmdbuf; /* Command buffer */
unsigned long flags; /* device flags */
unsigned long quirks; /* Various quirks */
wait_queue_head_t wait; /* For waiting the interrupt */
struct mutex reset_lock;
struct i2chid_ops *ops;
struct drm_panel_follower panel_follower;
struct work_struct panel_follower_prepare_work;
bool is_panel_follower;
bool prepare_work_finished;
};
static const struct i2c_hid_quirks {
__u16 idVendor;
__u16 idProduct;
__u32 quirks;
} i2c_hid_quirks[] = {
{ USB_VENDOR_ID_WEIDA, HID_ANY_ID,
I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
{ I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
{ I2C_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_VOYO_WINPAD_A15,
I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
{ I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_3118,
I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
{ USB_VENDOR_ID_ALPS_JP, HID_ANY_ID,
I2C_HID_QUIRK_RESET_ON_RESUME },
{ I2C_VENDOR_ID_SYNAPTICS, I2C_PRODUCT_ID_SYNAPTICS_SYNA2393,
I2C_HID_QUIRK_RESET_ON_RESUME },
{ USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720,
I2C_HID_QUIRK_BAD_INPUT_SIZE },
/*
* Sending the wakeup after reset actually break ELAN touchscreen controller
*/
{ USB_VENDOR_ID_ELAN, HID_ANY_ID,
I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET |
I2C_HID_QUIRK_BOGUS_IRQ },
{ 0, 0 }
};
/*
* i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
* @idVendor: the 16-bit vendor ID
* @idProduct: the 16-bit product ID
*
* Returns: a u32 quirks value.
*/
static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
{
u32 quirks = 0;
int n;
for (n = 0; i2c_hid_quirks[n].idVendor; n++)
if (i2c_hid_quirks[n].idVendor == idVendor &&
(i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
i2c_hid_quirks[n].idProduct == idProduct))
quirks = i2c_hid_quirks[n].quirks;
return quirks;
}
static int i2c_hid_xfer(struct i2c_hid *ihid,
u8 *send_buf, int send_len, u8 *recv_buf, int recv_len)
{
struct i2c_client *client = ihid->client;
struct i2c_msg msgs[2] = { 0 };
int n = 0;
int ret;
if (send_len) {
i2c_hid_dbg(ihid, "%s: cmd=%*ph\n",
__func__, send_len, send_buf);
msgs[n].addr = client->addr;
msgs[n].flags = (client->flags & I2C_M_TEN) | I2C_M_DMA_SAFE;
msgs[n].len = send_len;
msgs[n].buf = send_buf;
n++;
}
if (recv_len) {
msgs[n].addr = client->addr;
msgs[n].flags = (client->flags & I2C_M_TEN) |
I2C_M_RD | I2C_M_DMA_SAFE;
msgs[n].len = recv_len;
msgs[n].buf = recv_buf;
n++;
set_bit(I2C_HID_READ_PENDING, &ihid->flags);
}
ret = i2c_transfer(client->adapter, msgs, n);
if (recv_len)
clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
if (ret != n)
return ret < 0 ? ret : -EIO;
return 0;
}
static int i2c_hid_read_register(struct i2c_hid *ihid, __le16 reg,
void *buf, size_t len)
{
*(__le16 *)ihid->cmdbuf = reg;
return i2c_hid_xfer(ihid, ihid->cmdbuf, sizeof(__le16), buf, len);
}
static size_t i2c_hid_encode_command(u8 *buf, u8 opcode,
int report_type, int report_id)
{
size_t length = 0;
if (report_id < 0x0F) {
buf[length++] = report_type << 4 | report_id;
buf[length++] = opcode;
} else {
buf[length++] = report_type << 4 | 0x0F;
buf[length++] = opcode;
buf[length++] = report_id;
}
return length;
}
static int i2c_hid_get_report(struct i2c_hid *ihid,
u8 report_type, u8 report_id,
u8 *recv_buf, size_t recv_len)
{
size_t length = 0;
size_t ret_count;
int error;
i2c_hid_dbg(ihid, "%s\n", __func__);
/* Command register goes first */
*(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
length += sizeof(__le16);
/* Next is GET_REPORT command */
length += i2c_hid_encode_command(ihid->cmdbuf + length,
I2C_HID_OPCODE_GET_REPORT,
report_type, report_id);
/*
* Device will send report data through data register. Because
* command can be either 2 or 3 bytes destination for the data
* register may be not aligned.
*/
put_unaligned_le16(le16_to_cpu(ihid->hdesc.wDataRegister),
ihid->cmdbuf + length);
length += sizeof(__le16);
/*
* In addition to report data device will supply data length
* in the first 2 bytes of the response, so adjust .
*/
error = i2c_hid_xfer(ihid, ihid->cmdbuf, length,
ihid->rawbuf, recv_len + sizeof(__le16));
if (error) {
dev_err(&ihid->client->dev,
"failed to set a report to device: %d\n", error);
return error;
}
/* The buffer is sufficiently aligned */
ret_count = le16_to_cpup((__le16 *)ihid->rawbuf);
/* Check for empty report response */
if (ret_count <= sizeof(__le16))
return 0;
recv_len = min(recv_len, ret_count - sizeof(__le16));
memcpy(recv_buf, ihid->rawbuf + sizeof(__le16), recv_len);
if (report_id && recv_len != 0 && recv_buf[0] != report_id) {
dev_err(&ihid->client->dev,
"device returned incorrect report (%d vs %d expected)\n",
recv_buf[0], report_id);
return -EINVAL;
}
return recv_len;
}
static size_t i2c_hid_format_report(u8 *buf, int report_id,
const u8 *data, size_t size)
{
size_t length = sizeof(__le16); /* reserve space to store size */
if (report_id)
buf[length++] = report_id;
memcpy(buf + length, data, size);
length += size;
/* Store overall size in the beginning of the buffer */
put_unaligned_le16(length, buf);
return length;
}
/**
* i2c_hid_set_or_send_report: forward an incoming report to the device
* @ihid: the i2c hid device
* @report_type: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
* @report_id: the report ID
* @buf: the actual data to transfer, without the report ID
* @data_len: size of buf
* @do_set: true: use SET_REPORT HID command, false: send plain OUTPUT report
*/
static int i2c_hid_set_or_send_report(struct i2c_hid *ihid,
u8 report_type, u8 report_id,
const u8 *buf, size_t data_len,
bool do_set)
{
size_t length = 0;
int error;
i2c_hid_dbg(ihid, "%s\n", __func__);
if (data_len > ihid->bufsize)
return -EINVAL;
if (!do_set && le16_to_cpu(ihid->hdesc.wMaxOutputLength) == 0)
return -ENOSYS;
if (do_set) {
/* Command register goes first */
*(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
length += sizeof(__le16);
/* Next is SET_REPORT command */
length += i2c_hid_encode_command(ihid->cmdbuf + length,
I2C_HID_OPCODE_SET_REPORT,
report_type, report_id);
/*
* Report data will go into the data register. Because
* command can be either 2 or 3 bytes destination for
* the data register may be not aligned.
*/
put_unaligned_le16(le16_to_cpu(ihid->hdesc.wDataRegister),
ihid->cmdbuf + length);
length += sizeof(__le16);
} else {
/*
* With simple "send report" all data goes into the output
* register.
*/
*(__le16 *)ihid->cmdbuf = ihid->hdesc.wOutputRegister;
length += sizeof(__le16);
}
length += i2c_hid_format_report(ihid->cmdbuf + length,
report_id, buf, data_len);
error = i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
if (error) {
dev_err(&ihid->client->dev,
"failed to set a report to device: %d\n", error);
return error;
}
return data_len;
}
static int i2c_hid_set_power_command(struct i2c_hid *ihid, int power_state)
{
size_t length;
/* SET_POWER uses command register */
*(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
length = sizeof(__le16);
/* Now the command itself */
length += i2c_hid_encode_command(ihid->cmdbuf + length,
I2C_HID_OPCODE_SET_POWER,
0, power_state);
return i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
}
static int i2c_hid_set_power(struct i2c_hid *ihid, int power_state)
{
int ret;
i2c_hid_dbg(ihid, "%s\n", __func__);
/*
* Some devices require to send a command to wakeup before power on.
* The call will get a return value (EREMOTEIO) but device will be
* triggered and activated. After that, it goes like a normal device.
*/
if (power_state == I2C_HID_PWR_ON &&
ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
ret = i2c_hid_set_power_command(ihid, I2C_HID_PWR_ON);
/* Device was already activated */
if (!ret)
goto set_pwr_exit;
}
ret = i2c_hid_set_power_command(ihid, power_state);
if (ret)
dev_err(&ihid->client->dev,
"failed to change power setting.\n");
set_pwr_exit:
/*
* The HID over I2C specification states that if a DEVICE needs time
* after the PWR_ON request, it should utilise CLOCK stretching.
* However, it has been observered that the Windows driver provides a
* 1ms sleep between the PWR_ON and RESET requests.
* According to Goodix Windows even waits 60 ms after (other?)
* PWR_ON requests. Testing has confirmed that several devices
* will not work properly without a delay after a PWR_ON request.
*/
if (!ret && power_state == I2C_HID_PWR_ON)
msleep(60);
return ret;
}
static int i2c_hid_execute_reset(struct i2c_hid *ihid)
{
size_t length = 0;
int ret;
i2c_hid_dbg(ihid, "resetting...\n");
/* Prepare reset command. Command register goes first. */
*(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
length += sizeof(__le16);
/* Next is RESET command itself */
length += i2c_hid_encode_command(ihid->cmdbuf + length,
I2C_HID_OPCODE_RESET, 0, 0);
set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
ret = i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
if (ret) {
dev_err(&ihid->client->dev, "failed to reset device.\n");
goto out;
}
if (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET) {
msleep(100);
goto out;
}
i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
if (!wait_event_timeout(ihid->wait,
!test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
msecs_to_jiffies(5000))) {
ret = -ENODATA;
goto out;
}
i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
out:
clear_bit(I2C_HID_RESET_PENDING, &ihid->flags);
return ret;
}
static int i2c_hid_hwreset(struct i2c_hid *ihid)
{
int ret;
i2c_hid_dbg(ihid, "%s\n", __func__);
/*
* This prevents sending feature reports while the device is
* being reset. Otherwise we may lose the reset complete
* interrupt.
*/
mutex_lock(&ihid->reset_lock);
ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
if (ret)
goto out_unlock;
ret = i2c_hid_execute_reset(ihid);
if (ret) {
dev_err(&ihid->client->dev,
"failed to reset device: %d\n", ret);
i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
goto out_unlock;
}
/* At least some SIS devices need this after reset */
if (!(ihid->quirks & I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET))
ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
out_unlock:
mutex_unlock(&ihid->reset_lock);
return ret;
}
static void i2c_hid_get_input(struct i2c_hid *ihid)
{
u16 size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
u16 ret_size;
int ret;
if (size > ihid->bufsize)
size = ihid->bufsize;
ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
if (ret != size) {
if (ret < 0)
return;
dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
__func__, ret, size);
return;
}
/* Receiving buffer is properly aligned */
ret_size = le16_to_cpup((__le16 *)ihid->inbuf);
if (!ret_size) {
/* host or device initiated RESET completed */
if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
wake_up(&ihid->wait);
return;
}
if ((ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ) && ret_size == 0xffff) {
dev_warn_once(&ihid->client->dev,
"%s: IRQ triggered but there's no data\n",
__func__);
return;
}
if (ret_size > size || ret_size < sizeof(__le16)) {
if (ihid->quirks & I2C_HID_QUIRK_BAD_INPUT_SIZE) {
*(__le16 *)ihid->inbuf = cpu_to_le16(size);
ret_size = size;
} else {
dev_err(&ihid->client->dev,
"%s: incomplete report (%d/%d)\n",
__func__, size, ret_size);
return;
}
}
i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
if (test_bit(I2C_HID_STARTED, &ihid->flags)) {
if (ihid->hid->group != HID_GROUP_RMI)
pm_wakeup_event(&ihid->client->dev, 0);
hid_input_report(ihid->hid, HID_INPUT_REPORT,
ihid->inbuf + sizeof(__le16),
ret_size - sizeof(__le16), 1);
}
return;
}
static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
{
struct i2c_hid *ihid = dev_id;
if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
return IRQ_HANDLED;
i2c_hid_get_input(ihid);
return IRQ_HANDLED;
}
static int i2c_hid_get_report_length(struct hid_report *report)
{
return ((report->size - 1) >> 3) + 1 +
report->device->report_enum[report->type].numbered + 2;
}
/*
* Traverse the supplied list of reports and find the longest
*/
static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
unsigned int *max)
{
struct hid_report *report;
unsigned int size;
/* We should not rely on wMaxInputLength, as some devices may set it to
* a wrong length. */
list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
size = i2c_hid_get_report_length(report);
if (*max < size)
*max = size;
}
}
static void i2c_hid_free_buffers(struct i2c_hid *ihid)
{
kfree(ihid->inbuf);
kfree(ihid->rawbuf);
kfree(ihid->cmdbuf);
ihid->inbuf = NULL;
ihid->rawbuf = NULL;
ihid->cmdbuf = NULL;
ihid->bufsize = 0;
}
static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
{
/*
* The worst case is computed from the set_report command with a
* reportID > 15 and the maximum report length.
*/
int cmd_len = sizeof(__le16) + /* command register */
sizeof(u8) + /* encoded report type/ID */
sizeof(u8) + /* opcode */
sizeof(u8) + /* optional 3rd byte report ID */
sizeof(__le16) + /* data register */
sizeof(__le16) + /* report data size */
sizeof(u8) + /* report ID if numbered report */
report_size;
ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
ihid->cmdbuf = kzalloc(cmd_len, GFP_KERNEL);
if (!ihid->inbuf || !ihid->rawbuf || !ihid->cmdbuf) {
i2c_hid_free_buffers(ihid);
return -ENOMEM;
}
ihid->bufsize = report_size;
return 0;
}
static int i2c_hid_get_raw_report(struct hid_device *hid,
u8 report_type, u8 report_id,
u8 *buf, size_t count)
{
struct i2c_client *client = hid->driver_data;
struct i2c_hid *ihid = i2c_get_clientdata(client);
int ret_count;
if (report_type == HID_OUTPUT_REPORT)
return -EINVAL;
/*
* In case of unnumbered reports the response from the device will
* not have the report ID that the upper layers expect, so we need
* to stash it the buffer ourselves and adjust the data size.
*/
if (!report_id) {
buf[0] = 0;
buf++;
count--;
}
ret_count = i2c_hid_get_report(ihid,
report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
report_id, buf, count);
if (ret_count > 0 && !report_id)
ret_count++;
return ret_count;
}
static int i2c_hid_output_raw_report(struct hid_device *hid, u8 report_type,
const u8 *buf, size_t count, bool do_set)
{
struct i2c_client *client = hid->driver_data;
struct i2c_hid *ihid = i2c_get_clientdata(client);
int report_id = buf[0];
int ret;
if (report_type == HID_INPUT_REPORT)
return -EINVAL;
mutex_lock(&ihid->reset_lock);
/*
* Note that both numbered and unnumbered reports passed here
* are supposed to have report ID stored in the 1st byte of the
* buffer, so we strip it off unconditionally before passing payload
* to i2c_hid_set_or_send_report which takes care of encoding
* everything properly.
*/
ret = i2c_hid_set_or_send_report(ihid,
report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
report_id, buf + 1, count - 1, do_set);
if (ret >= 0)
ret++; /* add report_id to the number of transferred bytes */
mutex_unlock(&ihid->reset_lock);
return ret;
}
static int i2c_hid_output_report(struct hid_device *hid, u8 *buf, size_t count)
{
return i2c_hid_output_raw_report(hid, HID_OUTPUT_REPORT, buf, count,
false);
}
static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
__u8 *buf, size_t len, unsigned char rtype,
int reqtype)
{
switch (reqtype) {
case HID_REQ_GET_REPORT:
return i2c_hid_get_raw_report(hid, rtype, reportnum, buf, len);
case HID_REQ_SET_REPORT:
if (buf[0] != reportnum)
return -EINVAL;
return i2c_hid_output_raw_report(hid, rtype, buf, len, true);
default:
return -EIO;
}
}
static int i2c_hid_parse(struct hid_device *hid)
{
struct i2c_client *client = hid->driver_data;
struct i2c_hid *ihid = i2c_get_clientdata(client);
struct i2c_hid_desc *hdesc = &ihid->hdesc;
unsigned int rsize;
char *rdesc;
int ret;
int tries = 3;
char *use_override;
i2c_hid_dbg(ihid, "entering %s\n", __func__);
rsize = le16_to_cpu(hdesc->wReportDescLength);
if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
dbg_hid("weird size of report descriptor (%u)\n", rsize);
return -EINVAL;
}
do {
ret = i2c_hid_hwreset(ihid);
if (ret)
msleep(1000);
} while (tries-- > 0 && ret);
if (ret)
return ret;
use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
&rsize);
if (use_override) {
rdesc = use_override;
i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
} else {
rdesc = kzalloc(rsize, GFP_KERNEL);
if (!rdesc) {
dbg_hid("couldn't allocate rdesc memory\n");
return -ENOMEM;
}
i2c_hid_dbg(ihid, "asking HID report descriptor\n");
ret = i2c_hid_read_register(ihid,
ihid->hdesc.wReportDescRegister,
rdesc, rsize);
if (ret) {
hid_err(hid, "reading report descriptor failed\n");
kfree(rdesc);
return -EIO;
}
}
i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
ret = hid_parse_report(hid, rdesc, rsize);
if (!use_override)
kfree(rdesc);
if (ret) {
dbg_hid("parsing report descriptor failed\n");
return ret;
}
return 0;
}
static int i2c_hid_start(struct hid_device *hid)
{
struct i2c_client *client = hid->driver_data;
struct i2c_hid *ihid = i2c_get_clientdata(client);
int ret;
unsigned int bufsize = HID_MIN_BUFFER_SIZE;
i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
if (bufsize > ihid->bufsize) {
disable_irq(client->irq);
i2c_hid_free_buffers(ihid);
ret = i2c_hid_alloc_buffers(ihid, bufsize);
enable_irq(client->irq);
if (ret)
return ret;
}
return 0;
}
static void i2c_hid_stop(struct hid_device *hid)
{
hid->claimed = 0;
}
static int i2c_hid_open(struct hid_device *hid)
{
struct i2c_client *client = hid->driver_data;
struct i2c_hid *ihid = i2c_get_clientdata(client);
set_bit(I2C_HID_STARTED, &ihid->flags);
return 0;
}
static void i2c_hid_close(struct hid_device *hid)
{
struct i2c_client *client = hid->driver_data;
struct i2c_hid *ihid = i2c_get_clientdata(client);
clear_bit(I2C_HID_STARTED, &ihid->flags);
}
static const struct hid_ll_driver i2c_hid_ll_driver = {
.parse = i2c_hid_parse,
.start = i2c_hid_start,
.stop = i2c_hid_stop,
.open = i2c_hid_open,
.close = i2c_hid_close,
.output_report = i2c_hid_output_report,
.raw_request = i2c_hid_raw_request,
};
static int i2c_hid_init_irq(struct i2c_client *client)
{
struct i2c_hid *ihid = i2c_get_clientdata(client);
unsigned long irqflags = 0;
int ret;
i2c_hid_dbg(ihid, "Requesting IRQ: %d\n", client->irq);
if (!irq_get_trigger_type(client->irq))
irqflags = IRQF_TRIGGER_LOW;
ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
irqflags | IRQF_ONESHOT | IRQF_NO_AUTOEN,
client->name, ihid);
if (ret < 0) {
dev_warn(&client->dev,
"Could not register for %s interrupt, irq = %d,"
" ret = %d\n",
client->name, client->irq, ret);
return ret;
}
return 0;
}
static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
{
struct i2c_client *client = ihid->client;
struct i2c_hid_desc *hdesc = &ihid->hdesc;
unsigned int dsize;
int error;
/* i2c hid fetch using a fixed descriptor size (30 bytes) */
if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
ihid->hdesc =
*i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
} else {
i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
error = i2c_hid_read_register(ihid,
ihid->wHIDDescRegister,
&ihid->hdesc,
sizeof(ihid->hdesc));
if (error) {
dev_err(&ihid->client->dev,
"failed to fetch HID descriptor: %d\n",
error);
return -ENODEV;
}
}
/* Validate the length of HID descriptor, the 4 first bytes:
* bytes 0-1 -> length
* bytes 2-3 -> bcdVersion (has to be 1.00) */
/* check bcdVersion == 1.0 */
if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
dev_err(&ihid->client->dev,
"unexpected HID descriptor bcdVersion (0x%04hx)\n",
le16_to_cpu(hdesc->bcdVersion));
return -ENODEV;
}
/* Descriptor length should be 30 bytes as per the specification */
dsize = le16_to_cpu(hdesc->wHIDDescLength);
if (dsize != sizeof(struct i2c_hid_desc)) {
dev_err(&ihid->client->dev,
"weird size of HID descriptor (%u)\n", dsize);
return -ENODEV;
}
i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, &ihid->hdesc);
return 0;
}
static int i2c_hid_core_power_up(struct i2c_hid *ihid)
{
if (!ihid->ops->power_up)
return 0;
return ihid->ops->power_up(ihid->ops);
}
static void i2c_hid_core_power_down(struct i2c_hid *ihid)
{
if (!ihid->ops->power_down)
return;
ihid->ops->power_down(ihid->ops);
}
static void i2c_hid_core_shutdown_tail(struct i2c_hid *ihid)
{
if (!ihid->ops->shutdown_tail)
return;
ihid->ops->shutdown_tail(ihid->ops);
}
static int i2c_hid_core_suspend(struct i2c_hid *ihid, bool force_poweroff)
{
struct i2c_client *client = ihid->client;
struct hid_device *hid = ihid->hid;
int ret;
ret = hid_driver_suspend(hid, PMSG_SUSPEND);
if (ret < 0)
return ret;
/* Save some power */
i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
disable_irq(client->irq);
if (force_poweroff || !device_may_wakeup(&client->dev))
i2c_hid_core_power_down(ihid);
return 0;
}
static int i2c_hid_core_resume(struct i2c_hid *ihid)
{
struct i2c_client *client = ihid->client;
struct hid_device *hid = ihid->hid;
int ret;
if (!device_may_wakeup(&client->dev))
i2c_hid_core_power_up(ihid);
enable_irq(client->irq);
/* Instead of resetting device, simply powers the device on. This
* solves "incomplete reports" on Raydium devices 2386:3118 and
* 2386:4B33 and fixes various SIS touchscreens no longer sending
* data after a suspend/resume.
*
* However some ALPS touchpads generate IRQ storm without reset, so
* let's still reset them here.
*/
if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME)
ret = i2c_hid_hwreset(ihid);
else
ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
if (ret)
return ret;
return hid_driver_reset_resume(hid);
}
/**
* __do_i2c_hid_core_initial_power_up() - First time power up of the i2c-hid device.
* @ihid: The ihid object created during probe.
*
* This function is called at probe time.
*
* The initial power on is where we do some basic validation that the device
* exists, where we fetch the HID descriptor, and where we create the actual
* HID devices.
*
* Return: 0 or error code.
*/
static int __do_i2c_hid_core_initial_power_up(struct i2c_hid *ihid)
{
struct i2c_client *client = ihid->client;
struct hid_device *hid = ihid->hid;
int ret;
ret = i2c_hid_core_power_up(ihid);
if (ret)
return ret;
/* Make sure there is something at this address */
ret = i2c_smbus_read_byte(client);
if (ret < 0) {
i2c_hid_dbg(ihid, "nothing at this address: %d\n", ret);
ret = -ENXIO;
goto err;
}
ret = i2c_hid_fetch_hid_descriptor(ihid);
if (ret < 0) {
dev_err(&client->dev,
"Failed to fetch the HID Descriptor\n");
goto err;
}
enable_irq(client->irq);
hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
hid->product = le16_to_cpu(ihid->hdesc.wProductID);
hid->initial_quirks |= i2c_hid_get_dmi_quirks(hid->vendor,
hid->product);
snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
client->name, (u16)hid->vendor, (u16)hid->product);
strscpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
ret = hid_add_device(hid);
if (ret) {
if (ret != -ENODEV)
hid_err(client, "can't add hid device: %d\n", ret);
goto err;
}
return 0;
err:
i2c_hid_core_power_down(ihid);
return ret;
}
static void ihid_core_panel_prepare_work(struct work_struct *work)
{
struct i2c_hid *ihid = container_of(work, struct i2c_hid,
panel_follower_prepare_work);
struct hid_device *hid = ihid->hid;
int ret;
/*
* hid->version is set on the first power up. If it's still zero then
* this is the first power on so we should perform initial power up
* steps.
*/
if (!hid->version)
ret = __do_i2c_hid_core_initial_power_up(ihid);
else
ret = i2c_hid_core_resume(ihid);
if (ret)
dev_warn(&ihid->client->dev, "Power on failed: %d\n", ret);
else
WRITE_ONCE(ihid->prepare_work_finished, true);
/*
* The work APIs provide a number of memory ordering guarantees
* including one that says that memory writes before schedule_work()
* are always visible to the work function, but they don't appear to
* guarantee that a write that happened in the work is visible after
* cancel_work_sync(). We'll add a write memory barrier here to match
* with i2c_hid_core_panel_unpreparing() to ensure that our write to
* prepare_work_finished is visible there.
*/
smp_wmb();
}
static int i2c_hid_core_panel_prepared(struct drm_panel_follower *follower)
{
struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower);
/*
* Powering on a touchscreen can be a slow process. Queue the work to
* the system workqueue so we don't block the panel's power up.
*/
WRITE_ONCE(ihid->prepare_work_finished, false);
schedule_work(&ihid->panel_follower_prepare_work);
return 0;
}
static int i2c_hid_core_panel_unpreparing(struct drm_panel_follower *follower)
{
struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower);
cancel_work_sync(&ihid->panel_follower_prepare_work);
/* Match with ihid_core_panel_prepare_work() */
smp_rmb();
if (!READ_ONCE(ihid->prepare_work_finished))
return 0;
return i2c_hid_core_suspend(ihid, true);
}
static const struct drm_panel_follower_funcs i2c_hid_core_panel_follower_funcs = {
.panel_prepared = i2c_hid_core_panel_prepared,
.panel_unpreparing = i2c_hid_core_panel_unpreparing,
};
static int i2c_hid_core_register_panel_follower(struct i2c_hid *ihid)
{
struct device *dev = &ihid->client->dev;
int ret;
ihid->is_panel_follower = true;
ihid->panel_follower.funcs = &i2c_hid_core_panel_follower_funcs;
/*
* If we're not in control of our own power up/power down then we can't
* do the logic to manage wakeups. Give a warning if a user thought
* that was possible then force the capability off.
*/
if (device_can_wakeup(dev)) {
dev_warn(dev, "Can't wakeup if following panel\n");
device_set_wakeup_capable(dev, false);
}
ret = drm_panel_add_follower(dev, &ihid->panel_follower);
if (ret)
return ret;
return 0;
}
static int i2c_hid_core_initial_power_up(struct i2c_hid *ihid)
{
/*
* If we're a panel follower, we'll register and do our initial power
* up when the panel turns on; otherwise we do it right away.
*/
if (drm_is_panel_follower(&ihid->client->dev))
return i2c_hid_core_register_panel_follower(ihid);
else
return __do_i2c_hid_core_initial_power_up(ihid);
}
static void i2c_hid_core_final_power_down(struct i2c_hid *ihid)
{
/*
* If we're a follower, the act of unfollowing will cause us to be
* powered down. Otherwise we need to manually do it.
*/
if (ihid->is_panel_follower)
drm_panel_remove_follower(&ihid->panel_follower);
else
i2c_hid_core_suspend(ihid, true);
}
int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
u16 hid_descriptor_address, u32 quirks)
{
int ret;
struct i2c_hid *ihid;
struct hid_device *hid;
dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
if (!client->irq) {
dev_err(&client->dev,
"HID over i2c has not been provided an Int IRQ\n");
return -EINVAL;
}
if (client->irq < 0) {
if (client->irq != -EPROBE_DEFER)
dev_err(&client->dev,
"HID over i2c doesn't have a valid IRQ\n");
return client->irq;
}
ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
if (!ihid)
return -ENOMEM;
i2c_set_clientdata(client, ihid);
ihid->ops = ops;
ihid->client = client;
ihid->wHIDDescRegister = cpu_to_le16(hid_descriptor_address);
init_waitqueue_head(&ihid->wait);
mutex_init(&ihid->reset_lock);
INIT_WORK(&ihid->panel_follower_prepare_work, ihid_core_panel_prepare_work);
/* we need to allocate the command buffer without knowing the maximum
* size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
* real computation later. */
ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
if (ret < 0)
return ret;
device_enable_async_suspend(&client->dev);
ret = i2c_hid_init_irq(client);
if (ret < 0)
goto err_buffers_allocated;
hid = hid_allocate_device();
if (IS_ERR(hid)) {
ret = PTR_ERR(hid);
goto err_irq;
}
ihid->hid = hid;
hid->driver_data = client;
hid->ll_driver = &i2c_hid_ll_driver;
hid->dev.parent = &client->dev;
hid->bus = BUS_I2C;
hid->initial_quirks = quirks;
ret = i2c_hid_core_initial_power_up(ihid);
if (ret)
goto err_mem_free;
return 0;
err_mem_free:
hid_destroy_device(hid);
err_irq:
free_irq(client->irq, ihid);
err_buffers_allocated:
i2c_hid_free_buffers(ihid);
return ret;
}
EXPORT_SYMBOL_GPL(i2c_hid_core_probe);
void i2c_hid_core_remove(struct i2c_client *client)
{
struct i2c_hid *ihid = i2c_get_clientdata(client);
struct hid_device *hid;
i2c_hid_core_final_power_down(ihid);
hid = ihid->hid;
hid_destroy_device(hid);
free_irq(client->irq, ihid);
if (ihid->bufsize)
i2c_hid_free_buffers(ihid);
}
EXPORT_SYMBOL_GPL(i2c_hid_core_remove);
void i2c_hid_core_shutdown(struct i2c_client *client)
{
struct i2c_hid *ihid = i2c_get_clientdata(client);
i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
free_irq(client->irq, ihid);
i2c_hid_core_shutdown_tail(ihid);
}
EXPORT_SYMBOL_GPL(i2c_hid_core_shutdown);
static int i2c_hid_core_pm_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct i2c_hid *ihid = i2c_get_clientdata(client);
if (ihid->is_panel_follower)
return 0;
return i2c_hid_core_suspend(ihid, false);
}
static int i2c_hid_core_pm_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct i2c_hid *ihid = i2c_get_clientdata(client);
if (ihid->is_panel_follower)
return 0;
return i2c_hid_core_resume(ihid);
}
const struct dev_pm_ops i2c_hid_core_pm = {
SYSTEM_SLEEP_PM_OPS(i2c_hid_core_pm_suspend, i2c_hid_core_pm_resume)
};
EXPORT_SYMBOL_GPL(i2c_hid_core_pm);
MODULE_DESCRIPTION("HID over I2C core driver");
MODULE_AUTHOR("Benjamin Tissoires <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/i2c-hid/i2c-hid-core.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Elan touchscreens that use the i2c-hid protocol.
*
* Copyright 2020 Google LLC
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/regulator/consumer.h>
#include "i2c-hid.h"
struct elan_i2c_hid_chip_data {
unsigned int post_gpio_reset_on_delay_ms;
unsigned int post_gpio_reset_off_delay_ms;
unsigned int post_power_delay_ms;
u16 hid_descriptor_address;
const char *main_supply_name;
};
struct i2c_hid_of_elan {
struct i2chid_ops ops;
struct regulator *vcc33;
struct regulator *vccio;
struct gpio_desc *reset_gpio;
const struct elan_i2c_hid_chip_data *chip_data;
};
static int elan_i2c_hid_power_up(struct i2chid_ops *ops)
{
struct i2c_hid_of_elan *ihid_elan =
container_of(ops, struct i2c_hid_of_elan, ops);
int ret;
if (ihid_elan->vcc33) {
ret = regulator_enable(ihid_elan->vcc33);
if (ret)
return ret;
}
ret = regulator_enable(ihid_elan->vccio);
if (ret) {
regulator_disable(ihid_elan->vcc33);
return ret;
}
if (ihid_elan->chip_data->post_power_delay_ms)
msleep(ihid_elan->chip_data->post_power_delay_ms);
gpiod_set_value_cansleep(ihid_elan->reset_gpio, 0);
if (ihid_elan->chip_data->post_gpio_reset_on_delay_ms)
msleep(ihid_elan->chip_data->post_gpio_reset_on_delay_ms);
return 0;
}
static void elan_i2c_hid_power_down(struct i2chid_ops *ops)
{
struct i2c_hid_of_elan *ihid_elan =
container_of(ops, struct i2c_hid_of_elan, ops);
gpiod_set_value_cansleep(ihid_elan->reset_gpio, 1);
if (ihid_elan->chip_data->post_gpio_reset_off_delay_ms)
msleep(ihid_elan->chip_data->post_gpio_reset_off_delay_ms);
regulator_disable(ihid_elan->vccio);
if (ihid_elan->vcc33)
regulator_disable(ihid_elan->vcc33);
}
static int i2c_hid_of_elan_probe(struct i2c_client *client)
{
struct i2c_hid_of_elan *ihid_elan;
ihid_elan = devm_kzalloc(&client->dev, sizeof(*ihid_elan), GFP_KERNEL);
if (!ihid_elan)
return -ENOMEM;
ihid_elan->ops.power_up = elan_i2c_hid_power_up;
ihid_elan->ops.power_down = elan_i2c_hid_power_down;
/* Start out with reset asserted */
ihid_elan->reset_gpio =
devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ihid_elan->reset_gpio))
return PTR_ERR(ihid_elan->reset_gpio);
ihid_elan->vccio = devm_regulator_get(&client->dev, "vccio");
if (IS_ERR(ihid_elan->vccio))
return PTR_ERR(ihid_elan->vccio);
ihid_elan->chip_data = device_get_match_data(&client->dev);
if (ihid_elan->chip_data->main_supply_name) {
ihid_elan->vcc33 = devm_regulator_get(&client->dev,
ihid_elan->chip_data->main_supply_name);
if (IS_ERR(ihid_elan->vcc33))
return PTR_ERR(ihid_elan->vcc33);
}
return i2c_hid_core_probe(client, &ihid_elan->ops,
ihid_elan->chip_data->hid_descriptor_address, 0);
}
static const struct elan_i2c_hid_chip_data elan_ekth6915_chip_data = {
.post_power_delay_ms = 1,
.post_gpio_reset_on_delay_ms = 300,
.hid_descriptor_address = 0x0001,
.main_supply_name = "vcc33",
};
static const struct elan_i2c_hid_chip_data ilitek_ili9882t_chip_data = {
.post_power_delay_ms = 1,
.post_gpio_reset_on_delay_ms = 200,
.post_gpio_reset_off_delay_ms = 65,
.hid_descriptor_address = 0x0001,
/*
* this touchscreen is tightly integrated with the panel and assumes
* that the relevant power rails (other than the IO rail) have already
* been turned on by the panel driver because we're a panel follower.
*/
.main_supply_name = NULL,
};
static const struct of_device_id elan_i2c_hid_of_match[] = {
{ .compatible = "elan,ekth6915", .data = &elan_ekth6915_chip_data },
{ .compatible = "ilitek,ili9882t", .data = &ilitek_ili9882t_chip_data },
{ }
};
MODULE_DEVICE_TABLE(of, elan_i2c_hid_of_match);
static struct i2c_driver elan_i2c_hid_ts_driver = {
.driver = {
.name = "i2c_hid_of_elan",
.pm = &i2c_hid_core_pm,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(elan_i2c_hid_of_match),
},
.probe = i2c_hid_of_elan_probe,
.remove = i2c_hid_core_remove,
.shutdown = i2c_hid_core_shutdown,
};
module_i2c_driver(elan_i2c_hid_ts_driver);
MODULE_AUTHOR("Douglas Anderson <[email protected]>");
MODULE_DESCRIPTION("Elan i2c-hid touchscreen driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/hid/i2c-hid/i2c-hid-of-elan.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Copyright (C) STMicroelectronics SA 2017
* Author(s): M'boumba Cedric Madianga <[email protected]>
* Pierre-Yves Mordret <[email protected]>
*
* Driver for STM32 MDMA controller
*
* Inspired by stm32-dma.c and dma-jz4780.c
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/jiffies.h>
#include <linux/list.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include "virt-dma.h"
#define STM32_MDMA_GISR0 0x0000 /* MDMA Int Status Reg 1 */
/* MDMA Channel x interrupt/status register */
#define STM32_MDMA_CISR(x) (0x40 + 0x40 * (x)) /* x = 0..62 */
#define STM32_MDMA_CISR_CRQA BIT(16)
#define STM32_MDMA_CISR_TCIF BIT(4)
#define STM32_MDMA_CISR_BTIF BIT(3)
#define STM32_MDMA_CISR_BRTIF BIT(2)
#define STM32_MDMA_CISR_CTCIF BIT(1)
#define STM32_MDMA_CISR_TEIF BIT(0)
/* MDMA Channel x interrupt flag clear register */
#define STM32_MDMA_CIFCR(x) (0x44 + 0x40 * (x))
#define STM32_MDMA_CIFCR_CLTCIF BIT(4)
#define STM32_MDMA_CIFCR_CBTIF BIT(3)
#define STM32_MDMA_CIFCR_CBRTIF BIT(2)
#define STM32_MDMA_CIFCR_CCTCIF BIT(1)
#define STM32_MDMA_CIFCR_CTEIF BIT(0)
#define STM32_MDMA_CIFCR_CLEAR_ALL (STM32_MDMA_CIFCR_CLTCIF \
| STM32_MDMA_CIFCR_CBTIF \
| STM32_MDMA_CIFCR_CBRTIF \
| STM32_MDMA_CIFCR_CCTCIF \
| STM32_MDMA_CIFCR_CTEIF)
/* MDMA Channel x error status register */
#define STM32_MDMA_CESR(x) (0x48 + 0x40 * (x))
#define STM32_MDMA_CESR_BSE BIT(11)
#define STM32_MDMA_CESR_ASR BIT(10)
#define STM32_MDMA_CESR_TEMD BIT(9)
#define STM32_MDMA_CESR_TELD BIT(8)
#define STM32_MDMA_CESR_TED BIT(7)
#define STM32_MDMA_CESR_TEA_MASK GENMASK(6, 0)
/* MDMA Channel x control register */
#define STM32_MDMA_CCR(x) (0x4C + 0x40 * (x))
#define STM32_MDMA_CCR_SWRQ BIT(16)
#define STM32_MDMA_CCR_WEX BIT(14)
#define STM32_MDMA_CCR_HEX BIT(13)
#define STM32_MDMA_CCR_BEX BIT(12)
#define STM32_MDMA_CCR_SM BIT(8)
#define STM32_MDMA_CCR_PL_MASK GENMASK(7, 6)
#define STM32_MDMA_CCR_PL(n) FIELD_PREP(STM32_MDMA_CCR_PL_MASK, (n))
#define STM32_MDMA_CCR_TCIE BIT(5)
#define STM32_MDMA_CCR_BTIE BIT(4)
#define STM32_MDMA_CCR_BRTIE BIT(3)
#define STM32_MDMA_CCR_CTCIE BIT(2)
#define STM32_MDMA_CCR_TEIE BIT(1)
#define STM32_MDMA_CCR_EN BIT(0)
#define STM32_MDMA_CCR_IRQ_MASK (STM32_MDMA_CCR_TCIE \
| STM32_MDMA_CCR_BTIE \
| STM32_MDMA_CCR_BRTIE \
| STM32_MDMA_CCR_CTCIE \
| STM32_MDMA_CCR_TEIE)
/* MDMA Channel x transfer configuration register */
#define STM32_MDMA_CTCR(x) (0x50 + 0x40 * (x))
#define STM32_MDMA_CTCR_BWM BIT(31)
#define STM32_MDMA_CTCR_SWRM BIT(30)
#define STM32_MDMA_CTCR_TRGM_MSK GENMASK(29, 28)
#define STM32_MDMA_CTCR_TRGM(n) FIELD_PREP(STM32_MDMA_CTCR_TRGM_MSK, (n))
#define STM32_MDMA_CTCR_TRGM_GET(n) FIELD_GET(STM32_MDMA_CTCR_TRGM_MSK, (n))
#define STM32_MDMA_CTCR_PAM_MASK GENMASK(27, 26)
#define STM32_MDMA_CTCR_PAM(n) FIELD_PREP(STM32_MDMA_CTCR_PAM_MASK, (n))
#define STM32_MDMA_CTCR_PKE BIT(25)
#define STM32_MDMA_CTCR_TLEN_MSK GENMASK(24, 18)
#define STM32_MDMA_CTCR_TLEN(n) FIELD_PREP(STM32_MDMA_CTCR_TLEN_MSK, (n))
#define STM32_MDMA_CTCR_TLEN_GET(n) FIELD_GET(STM32_MDMA_CTCR_TLEN_MSK, (n))
#define STM32_MDMA_CTCR_LEN2_MSK GENMASK(25, 18)
#define STM32_MDMA_CTCR_LEN2(n) FIELD_PREP(STM32_MDMA_CTCR_LEN2_MSK, (n))
#define STM32_MDMA_CTCR_LEN2_GET(n) FIELD_GET(STM32_MDMA_CTCR_LEN2_MSK, (n))
#define STM32_MDMA_CTCR_DBURST_MASK GENMASK(17, 15)
#define STM32_MDMA_CTCR_DBURST(n) FIELD_PREP(STM32_MDMA_CTCR_DBURST_MASK, (n))
#define STM32_MDMA_CTCR_SBURST_MASK GENMASK(14, 12)
#define STM32_MDMA_CTCR_SBURST(n) FIELD_PREP(STM32_MDMA_CTCR_SBURST_MASK, (n))
#define STM32_MDMA_CTCR_DINCOS_MASK GENMASK(11, 10)
#define STM32_MDMA_CTCR_DINCOS(n) FIELD_PREP(STM32_MDMA_CTCR_DINCOS_MASK, (n))
#define STM32_MDMA_CTCR_SINCOS_MASK GENMASK(9, 8)
#define STM32_MDMA_CTCR_SINCOS(n) FIELD_PREP(STM32_MDMA_CTCR_SINCOS_MASK, (n))
#define STM32_MDMA_CTCR_DSIZE_MASK GENMASK(7, 6)
#define STM32_MDMA_CTCR_DSIZE(n) FIELD_PREP(STM32_MDMA_CTCR_DSIZE_MASK, (n))
#define STM32_MDMA_CTCR_SSIZE_MASK GENMASK(5, 4)
#define STM32_MDMA_CTCR_SSIZE(n) FIELD_PREP(STM32_MDMA_CTCR_SSIZE_MASK, (n))
#define STM32_MDMA_CTCR_DINC_MASK GENMASK(3, 2)
#define STM32_MDMA_CTCR_DINC(n) FIELD_PREP(STM32_MDMA_CTCR_DINC_MASK, (n))
#define STM32_MDMA_CTCR_SINC_MASK GENMASK(1, 0)
#define STM32_MDMA_CTCR_SINC(n) FIELD_PREP(STM32_MDMA_CTCR_SINC_MASK, (n))
#define STM32_MDMA_CTCR_CFG_MASK (STM32_MDMA_CTCR_SINC_MASK \
| STM32_MDMA_CTCR_DINC_MASK \
| STM32_MDMA_CTCR_SINCOS_MASK \
| STM32_MDMA_CTCR_DINCOS_MASK \
| STM32_MDMA_CTCR_LEN2_MSK \
| STM32_MDMA_CTCR_TRGM_MSK)
/* MDMA Channel x block number of data register */
#define STM32_MDMA_CBNDTR(x) (0x54 + 0x40 * (x))
#define STM32_MDMA_CBNDTR_BRC_MK GENMASK(31, 20)
#define STM32_MDMA_CBNDTR_BRC(n) FIELD_PREP(STM32_MDMA_CBNDTR_BRC_MK, (n))
#define STM32_MDMA_CBNDTR_BRC_GET(n) FIELD_GET(STM32_MDMA_CBNDTR_BRC_MK, (n))
#define STM32_MDMA_CBNDTR_BRDUM BIT(19)
#define STM32_MDMA_CBNDTR_BRSUM BIT(18)
#define STM32_MDMA_CBNDTR_BNDT_MASK GENMASK(16, 0)
#define STM32_MDMA_CBNDTR_BNDT(n) FIELD_PREP(STM32_MDMA_CBNDTR_BNDT_MASK, (n))
/* MDMA Channel x source address register */
#define STM32_MDMA_CSAR(x) (0x58 + 0x40 * (x))
/* MDMA Channel x destination address register */
#define STM32_MDMA_CDAR(x) (0x5C + 0x40 * (x))
/* MDMA Channel x block repeat address update register */
#define STM32_MDMA_CBRUR(x) (0x60 + 0x40 * (x))
#define STM32_MDMA_CBRUR_DUV_MASK GENMASK(31, 16)
#define STM32_MDMA_CBRUR_DUV(n) FIELD_PREP(STM32_MDMA_CBRUR_DUV_MASK, (n))
#define STM32_MDMA_CBRUR_SUV_MASK GENMASK(15, 0)
#define STM32_MDMA_CBRUR_SUV(n) FIELD_PREP(STM32_MDMA_CBRUR_SUV_MASK, (n))
/* MDMA Channel x link address register */
#define STM32_MDMA_CLAR(x) (0x64 + 0x40 * (x))
/* MDMA Channel x trigger and bus selection register */
#define STM32_MDMA_CTBR(x) (0x68 + 0x40 * (x))
#define STM32_MDMA_CTBR_DBUS BIT(17)
#define STM32_MDMA_CTBR_SBUS BIT(16)
#define STM32_MDMA_CTBR_TSEL_MASK GENMASK(5, 0)
#define STM32_MDMA_CTBR_TSEL(n) FIELD_PREP(STM32_MDMA_CTBR_TSEL_MASK, (n))
/* MDMA Channel x mask address register */
#define STM32_MDMA_CMAR(x) (0x70 + 0x40 * (x))
/* MDMA Channel x mask data register */
#define STM32_MDMA_CMDR(x) (0x74 + 0x40 * (x))
#define STM32_MDMA_MAX_BUF_LEN 128
#define STM32_MDMA_MAX_BLOCK_LEN 65536
#define STM32_MDMA_MAX_CHANNELS 32
#define STM32_MDMA_MAX_REQUESTS 256
#define STM32_MDMA_MAX_BURST 128
#define STM32_MDMA_VERY_HIGH_PRIORITY 0x3
enum stm32_mdma_trigger_mode {
STM32_MDMA_BUFFER,
STM32_MDMA_BLOCK,
STM32_MDMA_BLOCK_REP,
STM32_MDMA_LINKED_LIST,
};
enum stm32_mdma_width {
STM32_MDMA_BYTE,
STM32_MDMA_HALF_WORD,
STM32_MDMA_WORD,
STM32_MDMA_DOUBLE_WORD,
};
enum stm32_mdma_inc_mode {
STM32_MDMA_FIXED = 0,
STM32_MDMA_INC = 2,
STM32_MDMA_DEC = 3,
};
struct stm32_mdma_chan_config {
u32 request;
u32 priority_level;
u32 transfer_config;
u32 mask_addr;
u32 mask_data;
bool m2m_hw; /* True when MDMA is triggered by STM32 DMA */
};
struct stm32_mdma_hwdesc {
u32 ctcr;
u32 cbndtr;
u32 csar;
u32 cdar;
u32 cbrur;
u32 clar;
u32 ctbr;
u32 dummy;
u32 cmar;
u32 cmdr;
} __aligned(64);
struct stm32_mdma_desc_node {
struct stm32_mdma_hwdesc *hwdesc;
dma_addr_t hwdesc_phys;
};
struct stm32_mdma_desc {
struct virt_dma_desc vdesc;
u32 ccr;
bool cyclic;
u32 count;
struct stm32_mdma_desc_node node[];
};
struct stm32_mdma_dma_config {
u32 request; /* STM32 DMA channel stream id, triggering MDMA */
u32 cmar; /* STM32 DMA interrupt flag clear register address */
u32 cmdr; /* STM32 DMA Transfer Complete flag */
};
struct stm32_mdma_chan {
struct virt_dma_chan vchan;
struct dma_pool *desc_pool;
u32 id;
struct stm32_mdma_desc *desc;
u32 curr_hwdesc;
struct dma_slave_config dma_config;
struct stm32_mdma_chan_config chan_config;
bool busy;
u32 mem_burst;
u32 mem_width;
};
struct stm32_mdma_device {
struct dma_device ddev;
void __iomem *base;
struct clk *clk;
int irq;
u32 nr_channels;
u32 nr_requests;
u32 nr_ahb_addr_masks;
u32 chan_reserved;
struct stm32_mdma_chan chan[STM32_MDMA_MAX_CHANNELS];
u32 ahb_addr_masks[];
};
static struct stm32_mdma_device *stm32_mdma_get_dev(
struct stm32_mdma_chan *chan)
{
return container_of(chan->vchan.chan.device, struct stm32_mdma_device,
ddev);
}
static struct stm32_mdma_chan *to_stm32_mdma_chan(struct dma_chan *c)
{
return container_of(c, struct stm32_mdma_chan, vchan.chan);
}
static struct stm32_mdma_desc *to_stm32_mdma_desc(struct virt_dma_desc *vdesc)
{
return container_of(vdesc, struct stm32_mdma_desc, vdesc);
}
static struct device *chan2dev(struct stm32_mdma_chan *chan)
{
return &chan->vchan.chan.dev->device;
}
static struct device *mdma2dev(struct stm32_mdma_device *mdma_dev)
{
return mdma_dev->ddev.dev;
}
static u32 stm32_mdma_read(struct stm32_mdma_device *dmadev, u32 reg)
{
return readl_relaxed(dmadev->base + reg);
}
static void stm32_mdma_write(struct stm32_mdma_device *dmadev, u32 reg, u32 val)
{
writel_relaxed(val, dmadev->base + reg);
}
static void stm32_mdma_set_bits(struct stm32_mdma_device *dmadev, u32 reg,
u32 mask)
{
void __iomem *addr = dmadev->base + reg;
writel_relaxed(readl_relaxed(addr) | mask, addr);
}
static void stm32_mdma_clr_bits(struct stm32_mdma_device *dmadev, u32 reg,
u32 mask)
{
void __iomem *addr = dmadev->base + reg;
writel_relaxed(readl_relaxed(addr) & ~mask, addr);
}
static struct stm32_mdma_desc *stm32_mdma_alloc_desc(
struct stm32_mdma_chan *chan, u32 count)
{
struct stm32_mdma_desc *desc;
int i;
desc = kzalloc(struct_size(desc, node, count), GFP_NOWAIT);
if (!desc)
return NULL;
for (i = 0; i < count; i++) {
desc->node[i].hwdesc =
dma_pool_alloc(chan->desc_pool, GFP_NOWAIT,
&desc->node[i].hwdesc_phys);
if (!desc->node[i].hwdesc)
goto err;
}
desc->count = count;
return desc;
err:
dev_err(chan2dev(chan), "Failed to allocate descriptor\n");
while (--i >= 0)
dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
desc->node[i].hwdesc_phys);
kfree(desc);
return NULL;
}
static void stm32_mdma_desc_free(struct virt_dma_desc *vdesc)
{
struct stm32_mdma_desc *desc = to_stm32_mdma_desc(vdesc);
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(vdesc->tx.chan);
int i;
for (i = 0; i < desc->count; i++)
dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
desc->node[i].hwdesc_phys);
kfree(desc);
}
static int stm32_mdma_get_width(struct stm32_mdma_chan *chan,
enum dma_slave_buswidth width)
{
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
case DMA_SLAVE_BUSWIDTH_2_BYTES:
case DMA_SLAVE_BUSWIDTH_4_BYTES:
case DMA_SLAVE_BUSWIDTH_8_BYTES:
return ffs(width) - 1;
default:
dev_err(chan2dev(chan), "Dma bus width %i not supported\n",
width);
return -EINVAL;
}
}
static enum dma_slave_buswidth stm32_mdma_get_max_width(dma_addr_t addr,
u32 buf_len, u32 tlen)
{
enum dma_slave_buswidth max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
for (max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
max_width > DMA_SLAVE_BUSWIDTH_1_BYTE;
max_width >>= 1) {
/*
* Address and buffer length both have to be aligned on
* bus width
*/
if ((((buf_len | addr) & (max_width - 1)) == 0) &&
tlen >= max_width)
break;
}
return max_width;
}
static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst,
enum dma_slave_buswidth width)
{
u32 best_burst;
best_burst = min((u32)1 << __ffs(tlen | buf_len),
max_burst * width) / width;
return (best_burst > 0) ? best_burst : 1;
}
static int stm32_mdma_disable_chan(struct stm32_mdma_chan *chan)
{
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
u32 ccr, cisr, id, reg;
int ret;
id = chan->id;
reg = STM32_MDMA_CCR(id);
/* Disable interrupts */
stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_IRQ_MASK);
ccr = stm32_mdma_read(dmadev, reg);
if (ccr & STM32_MDMA_CCR_EN) {
stm32_mdma_clr_bits(dmadev, reg, STM32_MDMA_CCR_EN);
/* Ensure that any ongoing transfer has been completed */
ret = readl_relaxed_poll_timeout_atomic(
dmadev->base + STM32_MDMA_CISR(id), cisr,
(cisr & STM32_MDMA_CISR_CTCIF), 10, 1000);
if (ret) {
dev_err(chan2dev(chan), "%s: timeout!\n", __func__);
return -EBUSY;
}
}
return 0;
}
static void stm32_mdma_stop(struct stm32_mdma_chan *chan)
{
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
u32 status;
int ret;
/* Disable DMA */
ret = stm32_mdma_disable_chan(chan);
if (ret < 0)
return;
/* Clear interrupt status if it is there */
status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
if (status) {
dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n",
__func__, status);
stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
}
chan->busy = false;
}
static void stm32_mdma_set_bus(struct stm32_mdma_device *dmadev, u32 *ctbr,
u32 ctbr_mask, u32 src_addr)
{
u32 mask;
int i;
/* Check if memory device is on AHB or AXI */
*ctbr &= ~ctbr_mask;
mask = src_addr & 0xF0000000;
for (i = 0; i < dmadev->nr_ahb_addr_masks; i++) {
if (mask == dmadev->ahb_addr_masks[i]) {
*ctbr |= ctbr_mask;
break;
}
}
}
static int stm32_mdma_set_xfer_param(struct stm32_mdma_chan *chan,
enum dma_transfer_direction direction,
u32 *mdma_ccr, u32 *mdma_ctcr,
u32 *mdma_ctbr, dma_addr_t addr,
u32 buf_len)
{
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
enum dma_slave_buswidth src_addr_width, dst_addr_width;
phys_addr_t src_addr, dst_addr;
int src_bus_width, dst_bus_width;
u32 src_maxburst, dst_maxburst, src_best_burst, dst_best_burst;
u32 ccr, ctcr, ctbr, tlen;
src_addr_width = chan->dma_config.src_addr_width;
dst_addr_width = chan->dma_config.dst_addr_width;
src_maxburst = chan->dma_config.src_maxburst;
dst_maxburst = chan->dma_config.dst_maxburst;
ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id));
ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
/* Enable HW request mode */
ctcr &= ~STM32_MDMA_CTCR_SWRM;
/* Set DINC, SINC, DINCOS, SINCOS, TRGM and TLEN retrieve from DT */
ctcr &= ~STM32_MDMA_CTCR_CFG_MASK;
ctcr |= chan_config->transfer_config & STM32_MDMA_CTCR_CFG_MASK;
/*
* For buffer transfer length (TLEN) we have to set
* the number of bytes - 1 in CTCR register
*/
tlen = STM32_MDMA_CTCR_LEN2_GET(ctcr);
ctcr &= ~STM32_MDMA_CTCR_LEN2_MSK;
ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
/* Disable Pack Enable */
ctcr &= ~STM32_MDMA_CTCR_PKE;
/* Check burst size constraints */
if (src_maxburst * src_addr_width > STM32_MDMA_MAX_BURST ||
dst_maxburst * dst_addr_width > STM32_MDMA_MAX_BURST) {
dev_err(chan2dev(chan),
"burst size * bus width higher than %d bytes\n",
STM32_MDMA_MAX_BURST);
return -EINVAL;
}
if ((!is_power_of_2(src_maxburst) && src_maxburst > 0) ||
(!is_power_of_2(dst_maxburst) && dst_maxburst > 0)) {
dev_err(chan2dev(chan), "burst size must be a power of 2\n");
return -EINVAL;
}
/*
* Configure channel control:
* - Clear SW request as in this case this is a HW one
* - Clear WEX, HEX and BEX bits
* - Set priority level
*/
ccr &= ~(STM32_MDMA_CCR_SWRQ | STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK);
ccr |= STM32_MDMA_CCR_PL(chan_config->priority_level);
/* Configure Trigger selection */
ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
ctbr |= STM32_MDMA_CTBR_TSEL(chan_config->request);
switch (direction) {
case DMA_MEM_TO_DEV:
dst_addr = chan->dma_config.dst_addr;
/* Set device data size */
if (chan_config->m2m_hw)
dst_addr_width = stm32_mdma_get_max_width(dst_addr, buf_len,
STM32_MDMA_MAX_BUF_LEN);
dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
if (dst_bus_width < 0)
return dst_bus_width;
ctcr &= ~STM32_MDMA_CTCR_DSIZE_MASK;
ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width);
if (chan_config->m2m_hw) {
ctcr &= ~STM32_MDMA_CTCR_DINCOS_MASK;
ctcr |= STM32_MDMA_CTCR_DINCOS(dst_bus_width);
}
/* Set device burst value */
if (chan_config->m2m_hw)
dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
dst_maxburst,
dst_addr_width);
chan->mem_burst = dst_best_burst;
ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
/* Set memory data size */
src_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
chan->mem_width = src_addr_width;
src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
if (src_bus_width < 0)
return src_bus_width;
ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK |
STM32_MDMA_CTCR_SINCOS_MASK;
ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width) |
STM32_MDMA_CTCR_SINCOS(src_bus_width);
/* Set memory burst value */
src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
src_maxburst,
src_addr_width);
chan->mem_burst = src_best_burst;
ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
/* Select bus */
stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
dst_addr);
if (dst_bus_width != src_bus_width)
ctcr |= STM32_MDMA_CTCR_PKE;
/* Set destination address */
stm32_mdma_write(dmadev, STM32_MDMA_CDAR(chan->id), dst_addr);
break;
case DMA_DEV_TO_MEM:
src_addr = chan->dma_config.src_addr;
/* Set device data size */
if (chan_config->m2m_hw)
src_addr_width = stm32_mdma_get_max_width(src_addr, buf_len,
STM32_MDMA_MAX_BUF_LEN);
src_bus_width = stm32_mdma_get_width(chan, src_addr_width);
if (src_bus_width < 0)
return src_bus_width;
ctcr &= ~STM32_MDMA_CTCR_SSIZE_MASK;
ctcr |= STM32_MDMA_CTCR_SSIZE(src_bus_width);
if (chan_config->m2m_hw) {
ctcr &= ~STM32_MDMA_CTCR_SINCOS_MASK;
ctcr |= STM32_MDMA_CTCR_SINCOS(src_bus_width);
}
/* Set device burst value */
if (chan_config->m2m_hw)
src_maxburst = STM32_MDMA_MAX_BUF_LEN / src_addr_width;
src_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
src_maxburst,
src_addr_width);
ctcr &= ~STM32_MDMA_CTCR_SBURST_MASK;
ctcr |= STM32_MDMA_CTCR_SBURST((ilog2(src_best_burst)));
/* Set memory data size */
dst_addr_width = stm32_mdma_get_max_width(addr, buf_len, tlen);
chan->mem_width = dst_addr_width;
dst_bus_width = stm32_mdma_get_width(chan, dst_addr_width);
if (dst_bus_width < 0)
return dst_bus_width;
ctcr &= ~(STM32_MDMA_CTCR_DSIZE_MASK |
STM32_MDMA_CTCR_DINCOS_MASK);
ctcr |= STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
STM32_MDMA_CTCR_DINCOS(dst_bus_width);
/* Set memory burst value */
dst_maxburst = STM32_MDMA_MAX_BUF_LEN / dst_addr_width;
dst_best_burst = stm32_mdma_get_best_burst(buf_len, tlen,
dst_maxburst,
dst_addr_width);
ctcr &= ~STM32_MDMA_CTCR_DBURST_MASK;
ctcr |= STM32_MDMA_CTCR_DBURST((ilog2(dst_best_burst)));
/* Select bus */
stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
src_addr);
if (dst_bus_width != src_bus_width)
ctcr |= STM32_MDMA_CTCR_PKE;
/* Set source address */
stm32_mdma_write(dmadev, STM32_MDMA_CSAR(chan->id), src_addr);
break;
default:
dev_err(chan2dev(chan), "Dma direction is not supported\n");
return -EINVAL;
}
*mdma_ccr = ccr;
*mdma_ctcr = ctcr;
*mdma_ctbr = ctbr;
return 0;
}
static void stm32_mdma_dump_hwdesc(struct stm32_mdma_chan *chan,
struct stm32_mdma_desc_node *node)
{
dev_dbg(chan2dev(chan), "hwdesc: %pad\n", &node->hwdesc_phys);
dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n", node->hwdesc->ctcr);
dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n", node->hwdesc->cbndtr);
dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n", node->hwdesc->csar);
dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n", node->hwdesc->cdar);
dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n", node->hwdesc->cbrur);
dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n", node->hwdesc->clar);
dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n", node->hwdesc->ctbr);
dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n", node->hwdesc->cmar);
dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n\n", node->hwdesc->cmdr);
}
static void stm32_mdma_setup_hwdesc(struct stm32_mdma_chan *chan,
struct stm32_mdma_desc *desc,
enum dma_transfer_direction dir, u32 count,
dma_addr_t src_addr, dma_addr_t dst_addr,
u32 len, u32 ctcr, u32 ctbr, bool is_last,
bool is_first, bool is_cyclic)
{
struct stm32_mdma_chan_config *config = &chan->chan_config;
struct stm32_mdma_hwdesc *hwdesc;
u32 next = count + 1;
hwdesc = desc->node[count].hwdesc;
hwdesc->ctcr = ctcr;
hwdesc->cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK |
STM32_MDMA_CBNDTR_BRDUM |
STM32_MDMA_CBNDTR_BRSUM |
STM32_MDMA_CBNDTR_BNDT_MASK);
hwdesc->cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
hwdesc->csar = src_addr;
hwdesc->cdar = dst_addr;
hwdesc->cbrur = 0;
hwdesc->ctbr = ctbr;
hwdesc->cmar = config->mask_addr;
hwdesc->cmdr = config->mask_data;
if (is_last) {
if (is_cyclic)
hwdesc->clar = desc->node[0].hwdesc_phys;
else
hwdesc->clar = 0;
} else {
hwdesc->clar = desc->node[next].hwdesc_phys;
}
stm32_mdma_dump_hwdesc(chan, &desc->node[count]);
}
static int stm32_mdma_setup_xfer(struct stm32_mdma_chan *chan,
struct stm32_mdma_desc *desc,
struct scatterlist *sgl, u32 sg_len,
enum dma_transfer_direction direction)
{
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
struct dma_slave_config *dma_config = &chan->dma_config;
struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
struct scatterlist *sg;
dma_addr_t src_addr, dst_addr;
u32 m2m_hw_period, ccr, ctcr, ctbr;
int i, ret = 0;
if (chan_config->m2m_hw)
m2m_hw_period = sg_dma_len(sgl);
for_each_sg(sgl, sg, sg_len, i) {
if (sg_dma_len(sg) > STM32_MDMA_MAX_BLOCK_LEN) {
dev_err(chan2dev(chan), "Invalid block len\n");
return -EINVAL;
}
if (direction == DMA_MEM_TO_DEV) {
src_addr = sg_dma_address(sg);
dst_addr = dma_config->dst_addr;
if (chan_config->m2m_hw && (i & 1))
dst_addr += m2m_hw_period;
ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
&ctcr, &ctbr, src_addr,
sg_dma_len(sg));
stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
src_addr);
} else {
src_addr = dma_config->src_addr;
if (chan_config->m2m_hw && (i & 1))
src_addr += m2m_hw_period;
dst_addr = sg_dma_address(sg);
ret = stm32_mdma_set_xfer_param(chan, direction, &ccr,
&ctcr, &ctbr, dst_addr,
sg_dma_len(sg));
stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
dst_addr);
}
if (ret < 0)
return ret;
stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
dst_addr, sg_dma_len(sg), ctcr, ctbr,
i == sg_len - 1, i == 0, false);
}
/* Enable interrupts */
ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE;
if (sg_len > 1)
ccr |= STM32_MDMA_CCR_BTIE;
desc->ccr = ccr;
return 0;
}
static struct dma_async_tx_descriptor *
stm32_mdma_prep_slave_sg(struct dma_chan *c, struct scatterlist *sgl,
u32 sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
struct stm32_mdma_desc *desc;
int i, ret;
/*
* Once DMA is in setup cyclic mode the channel we cannot assign this
* channel anymore. The DMA channel needs to be aborted or terminated
* for allowing another request.
*/
if (chan->desc && chan->desc->cyclic) {
dev_err(chan2dev(chan),
"Request not allowed when dma in cyclic mode\n");
return NULL;
}
desc = stm32_mdma_alloc_desc(chan, sg_len);
if (!desc)
return NULL;
ret = stm32_mdma_setup_xfer(chan, desc, sgl, sg_len, direction);
if (ret < 0)
goto xfer_setup_err;
/*
* In case of M2M HW transfer triggered by STM32 DMA, we do not have to clear the
* transfer complete flag by hardware in order to let the CPU rearm the STM32 DMA
* with the next sg element and update some data in dmaengine framework.
*/
if (chan_config->m2m_hw && direction == DMA_MEM_TO_DEV) {
struct stm32_mdma_hwdesc *hwdesc;
for (i = 0; i < sg_len; i++) {
hwdesc = desc->node[i].hwdesc;
hwdesc->cmar = 0;
hwdesc->cmdr = 0;
}
}
desc->cyclic = false;
return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
xfer_setup_err:
for (i = 0; i < desc->count; i++)
dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
desc->node[i].hwdesc_phys);
kfree(desc);
return NULL;
}
static struct dma_async_tx_descriptor *
stm32_mdma_prep_dma_cyclic(struct dma_chan *c, dma_addr_t buf_addr,
size_t buf_len, size_t period_len,
enum dma_transfer_direction direction,
unsigned long flags)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
struct dma_slave_config *dma_config = &chan->dma_config;
struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
struct stm32_mdma_desc *desc;
dma_addr_t src_addr, dst_addr;
u32 ccr, ctcr, ctbr, count;
int i, ret;
/*
* Once DMA is in setup cyclic mode the channel we cannot assign this
* channel anymore. The DMA channel needs to be aborted or terminated
* for allowing another request.
*/
if (chan->desc && chan->desc->cyclic) {
dev_err(chan2dev(chan),
"Request not allowed when dma in cyclic mode\n");
return NULL;
}
if (!buf_len || !period_len || period_len > STM32_MDMA_MAX_BLOCK_LEN) {
dev_err(chan2dev(chan), "Invalid buffer/period len\n");
return NULL;
}
if (buf_len % period_len) {
dev_err(chan2dev(chan), "buf_len not multiple of period_len\n");
return NULL;
}
count = buf_len / period_len;
desc = stm32_mdma_alloc_desc(chan, count);
if (!desc)
return NULL;
/* Select bus */
if (direction == DMA_MEM_TO_DEV) {
src_addr = buf_addr;
ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
&ctbr, src_addr, period_len);
stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS,
src_addr);
} else {
dst_addr = buf_addr;
ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
&ctbr, dst_addr, period_len);
stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS,
dst_addr);
}
if (ret < 0)
goto xfer_setup_err;
/* Enable interrupts */
ccr &= ~STM32_MDMA_CCR_IRQ_MASK;
ccr |= STM32_MDMA_CCR_TEIE | STM32_MDMA_CCR_CTCIE | STM32_MDMA_CCR_BTIE;
desc->ccr = ccr;
/* Configure hwdesc list */
for (i = 0; i < count; i++) {
if (direction == DMA_MEM_TO_DEV) {
src_addr = buf_addr + i * period_len;
dst_addr = dma_config->dst_addr;
if (chan_config->m2m_hw && (i & 1))
dst_addr += period_len;
} else {
src_addr = dma_config->src_addr;
if (chan_config->m2m_hw && (i & 1))
src_addr += period_len;
dst_addr = buf_addr + i * period_len;
}
stm32_mdma_setup_hwdesc(chan, desc, direction, i, src_addr,
dst_addr, period_len, ctcr, ctbr,
i == count - 1, i == 0, true);
}
desc->cyclic = true;
return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
xfer_setup_err:
for (i = 0; i < desc->count; i++)
dma_pool_free(chan->desc_pool, desc->node[i].hwdesc,
desc->node[i].hwdesc_phys);
kfree(desc);
return NULL;
}
static struct dma_async_tx_descriptor *
stm32_mdma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
enum dma_slave_buswidth max_width;
struct stm32_mdma_desc *desc;
struct stm32_mdma_hwdesc *hwdesc;
u32 ccr, ctcr, ctbr, cbndtr, count, max_burst, mdma_burst;
u32 best_burst, tlen;
size_t xfer_count, offset;
int src_bus_width, dst_bus_width;
int i;
/*
* Once DMA is in setup cyclic mode the channel we cannot assign this
* channel anymore. The DMA channel needs to be aborted or terminated
* to allow another request
*/
if (chan->desc && chan->desc->cyclic) {
dev_err(chan2dev(chan),
"Request not allowed when dma in cyclic mode\n");
return NULL;
}
count = DIV_ROUND_UP(len, STM32_MDMA_MAX_BLOCK_LEN);
desc = stm32_mdma_alloc_desc(chan, count);
if (!desc)
return NULL;
ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id));
ctcr = stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id));
ctbr = stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id));
cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
/* Enable sw req, some interrupts and clear other bits */
ccr &= ~(STM32_MDMA_CCR_WEX | STM32_MDMA_CCR_HEX |
STM32_MDMA_CCR_BEX | STM32_MDMA_CCR_PL_MASK |
STM32_MDMA_CCR_IRQ_MASK);
ccr |= STM32_MDMA_CCR_TEIE;
/* Enable SW request mode, dest/src inc and clear other bits */
ctcr &= ~(STM32_MDMA_CTCR_BWM | STM32_MDMA_CTCR_TRGM_MSK |
STM32_MDMA_CTCR_PAM_MASK | STM32_MDMA_CTCR_PKE |
STM32_MDMA_CTCR_TLEN_MSK | STM32_MDMA_CTCR_DBURST_MASK |
STM32_MDMA_CTCR_SBURST_MASK | STM32_MDMA_CTCR_DINCOS_MASK |
STM32_MDMA_CTCR_SINCOS_MASK | STM32_MDMA_CTCR_DSIZE_MASK |
STM32_MDMA_CTCR_SSIZE_MASK | STM32_MDMA_CTCR_DINC_MASK |
STM32_MDMA_CTCR_SINC_MASK);
ctcr |= STM32_MDMA_CTCR_SWRM | STM32_MDMA_CTCR_SINC(STM32_MDMA_INC) |
STM32_MDMA_CTCR_DINC(STM32_MDMA_INC);
/* Reset HW request */
ctbr &= ~STM32_MDMA_CTBR_TSEL_MASK;
/* Select bus */
stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_SBUS, src);
stm32_mdma_set_bus(dmadev, &ctbr, STM32_MDMA_CTBR_DBUS, dest);
/* Clear CBNDTR registers */
cbndtr &= ~(STM32_MDMA_CBNDTR_BRC_MK | STM32_MDMA_CBNDTR_BRDUM |
STM32_MDMA_CBNDTR_BRSUM | STM32_MDMA_CBNDTR_BNDT_MASK);
if (len <= STM32_MDMA_MAX_BLOCK_LEN) {
cbndtr |= STM32_MDMA_CBNDTR_BNDT(len);
if (len <= STM32_MDMA_MAX_BUF_LEN) {
/* Setup a buffer transfer */
ccr |= STM32_MDMA_CCR_TCIE | STM32_MDMA_CCR_CTCIE;
ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BUFFER);
} else {
/* Setup a block transfer */
ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_BLOCK);
}
tlen = STM32_MDMA_MAX_BUF_LEN;
ctcr |= STM32_MDMA_CTCR_TLEN((tlen - 1));
/* Set source best burst size */
max_width = stm32_mdma_get_max_width(src, len, tlen);
src_bus_width = stm32_mdma_get_width(chan, max_width);
max_burst = tlen / max_width;
best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
max_width);
mdma_burst = ilog2(best_burst);
ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
STM32_MDMA_CTCR_SSIZE(src_bus_width) |
STM32_MDMA_CTCR_SINCOS(src_bus_width);
/* Set destination best burst size */
max_width = stm32_mdma_get_max_width(dest, len, tlen);
dst_bus_width = stm32_mdma_get_width(chan, max_width);
max_burst = tlen / max_width;
best_burst = stm32_mdma_get_best_burst(len, tlen, max_burst,
max_width);
mdma_burst = ilog2(best_burst);
ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
STM32_MDMA_CTCR_DINCOS(dst_bus_width);
if (dst_bus_width != src_bus_width)
ctcr |= STM32_MDMA_CTCR_PKE;
/* Prepare hardware descriptor */
hwdesc = desc->node[0].hwdesc;
hwdesc->ctcr = ctcr;
hwdesc->cbndtr = cbndtr;
hwdesc->csar = src;
hwdesc->cdar = dest;
hwdesc->cbrur = 0;
hwdesc->clar = 0;
hwdesc->ctbr = ctbr;
hwdesc->cmar = 0;
hwdesc->cmdr = 0;
stm32_mdma_dump_hwdesc(chan, &desc->node[0]);
} else {
/* Setup a LLI transfer */
ctcr |= STM32_MDMA_CTCR_TRGM(STM32_MDMA_LINKED_LIST) |
STM32_MDMA_CTCR_TLEN((STM32_MDMA_MAX_BUF_LEN - 1));
ccr |= STM32_MDMA_CCR_BTIE | STM32_MDMA_CCR_CTCIE;
tlen = STM32_MDMA_MAX_BUF_LEN;
for (i = 0, offset = 0; offset < len;
i++, offset += xfer_count) {
xfer_count = min_t(size_t, len - offset,
STM32_MDMA_MAX_BLOCK_LEN);
/* Set source best burst size */
max_width = stm32_mdma_get_max_width(src, len, tlen);
src_bus_width = stm32_mdma_get_width(chan, max_width);
max_burst = tlen / max_width;
best_burst = stm32_mdma_get_best_burst(len, tlen,
max_burst,
max_width);
mdma_burst = ilog2(best_burst);
ctcr |= STM32_MDMA_CTCR_SBURST(mdma_burst) |
STM32_MDMA_CTCR_SSIZE(src_bus_width) |
STM32_MDMA_CTCR_SINCOS(src_bus_width);
/* Set destination best burst size */
max_width = stm32_mdma_get_max_width(dest, len, tlen);
dst_bus_width = stm32_mdma_get_width(chan, max_width);
max_burst = tlen / max_width;
best_burst = stm32_mdma_get_best_burst(len, tlen,
max_burst,
max_width);
mdma_burst = ilog2(best_burst);
ctcr |= STM32_MDMA_CTCR_DBURST(mdma_burst) |
STM32_MDMA_CTCR_DSIZE(dst_bus_width) |
STM32_MDMA_CTCR_DINCOS(dst_bus_width);
if (dst_bus_width != src_bus_width)
ctcr |= STM32_MDMA_CTCR_PKE;
/* Prepare hardware descriptor */
stm32_mdma_setup_hwdesc(chan, desc, DMA_MEM_TO_MEM, i,
src + offset, dest + offset,
xfer_count, ctcr, ctbr,
i == count - 1, i == 0, false);
}
}
desc->ccr = ccr;
desc->cyclic = false;
return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
}
static void stm32_mdma_dump_reg(struct stm32_mdma_chan *chan)
{
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
dev_dbg(chan2dev(chan), "CCR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)));
dev_dbg(chan2dev(chan), "CTCR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CTCR(chan->id)));
dev_dbg(chan2dev(chan), "CBNDTR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id)));
dev_dbg(chan2dev(chan), "CSAR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CSAR(chan->id)));
dev_dbg(chan2dev(chan), "CDAR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CDAR(chan->id)));
dev_dbg(chan2dev(chan), "CBRUR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CBRUR(chan->id)));
dev_dbg(chan2dev(chan), "CLAR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CLAR(chan->id)));
dev_dbg(chan2dev(chan), "CTBR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CTBR(chan->id)));
dev_dbg(chan2dev(chan), "CMAR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CMAR(chan->id)));
dev_dbg(chan2dev(chan), "CMDR: 0x%08x\n",
stm32_mdma_read(dmadev, STM32_MDMA_CMDR(chan->id)));
}
static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan)
{
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
struct virt_dma_desc *vdesc;
struct stm32_mdma_hwdesc *hwdesc;
u32 id = chan->id;
u32 status, reg;
vdesc = vchan_next_desc(&chan->vchan);
if (!vdesc) {
chan->desc = NULL;
return;
}
list_del(&vdesc->node);
chan->desc = to_stm32_mdma_desc(vdesc);
hwdesc = chan->desc->node[0].hwdesc;
chan->curr_hwdesc = 0;
stm32_mdma_write(dmadev, STM32_MDMA_CCR(id), chan->desc->ccr);
stm32_mdma_write(dmadev, STM32_MDMA_CTCR(id), hwdesc->ctcr);
stm32_mdma_write(dmadev, STM32_MDMA_CBNDTR(id), hwdesc->cbndtr);
stm32_mdma_write(dmadev, STM32_MDMA_CSAR(id), hwdesc->csar);
stm32_mdma_write(dmadev, STM32_MDMA_CDAR(id), hwdesc->cdar);
stm32_mdma_write(dmadev, STM32_MDMA_CBRUR(id), hwdesc->cbrur);
stm32_mdma_write(dmadev, STM32_MDMA_CLAR(id), hwdesc->clar);
stm32_mdma_write(dmadev, STM32_MDMA_CTBR(id), hwdesc->ctbr);
stm32_mdma_write(dmadev, STM32_MDMA_CMAR(id), hwdesc->cmar);
stm32_mdma_write(dmadev, STM32_MDMA_CMDR(id), hwdesc->cmdr);
/* Clear interrupt status if it is there */
status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id));
if (status)
stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(id), status);
stm32_mdma_dump_reg(chan);
/* Start DMA */
stm32_mdma_set_bits(dmadev, STM32_MDMA_CCR(id), STM32_MDMA_CCR_EN);
/* Set SW request in case of MEM2MEM transfer */
if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM) {
reg = STM32_MDMA_CCR(id);
stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
}
chan->busy = true;
dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan);
}
static void stm32_mdma_issue_pending(struct dma_chan *c)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
unsigned long flags;
spin_lock_irqsave(&chan->vchan.lock, flags);
if (!vchan_issue_pending(&chan->vchan))
goto end;
dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan);
if (!chan->desc && !chan->busy)
stm32_mdma_start_transfer(chan);
end:
spin_unlock_irqrestore(&chan->vchan.lock, flags);
}
static int stm32_mdma_pause(struct dma_chan *c)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
unsigned long flags;
int ret;
spin_lock_irqsave(&chan->vchan.lock, flags);
ret = stm32_mdma_disable_chan(chan);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
if (!ret)
dev_dbg(chan2dev(chan), "vchan %pK: pause\n", &chan->vchan);
return ret;
}
static int stm32_mdma_resume(struct dma_chan *c)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
struct stm32_mdma_hwdesc *hwdesc;
unsigned long flags;
u32 status, reg;
hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc;
spin_lock_irqsave(&chan->vchan.lock, flags);
/* Re-configure control register */
stm32_mdma_write(dmadev, STM32_MDMA_CCR(chan->id), chan->desc->ccr);
/* Clear interrupt status if it is there */
status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(chan->id));
if (status)
stm32_mdma_set_bits(dmadev, STM32_MDMA_CIFCR(chan->id), status);
stm32_mdma_dump_reg(chan);
/* Re-start DMA */
reg = STM32_MDMA_CCR(chan->id);
stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_EN);
/* Set SW request in case of MEM2MEM transfer */
if (hwdesc->ctcr & STM32_MDMA_CTCR_SWRM)
stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CCR_SWRQ);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
dev_dbg(chan2dev(chan), "vchan %pK: resume\n", &chan->vchan);
return 0;
}
static int stm32_mdma_terminate_all(struct dma_chan *c)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&chan->vchan.lock, flags);
if (chan->desc) {
vchan_terminate_vdesc(&chan->desc->vdesc);
if (chan->busy)
stm32_mdma_stop(chan);
chan->desc = NULL;
}
vchan_get_all_descriptors(&chan->vchan, &head);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
vchan_dma_desc_free_list(&chan->vchan, &head);
return 0;
}
static void stm32_mdma_synchronize(struct dma_chan *c)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
vchan_synchronize(&chan->vchan);
}
static int stm32_mdma_slave_config(struct dma_chan *c,
struct dma_slave_config *config)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
memcpy(&chan->dma_config, config, sizeof(*config));
/* Check if user is requesting STM32 DMA to trigger MDMA */
if (config->peripheral_size) {
struct stm32_mdma_dma_config *mdma_config;
mdma_config = (struct stm32_mdma_dma_config *)chan->dma_config.peripheral_config;
chan->chan_config.request = mdma_config->request;
chan->chan_config.mask_addr = mdma_config->cmar;
chan->chan_config.mask_data = mdma_config->cmdr;
chan->chan_config.m2m_hw = true;
}
return 0;
}
static size_t stm32_mdma_desc_residue(struct stm32_mdma_chan *chan,
struct stm32_mdma_desc *desc,
u32 curr_hwdesc)
{
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
struct stm32_mdma_hwdesc *hwdesc;
u32 cbndtr, residue, modulo, burst_size;
int i;
residue = 0;
for (i = curr_hwdesc + 1; i < desc->count; i++) {
hwdesc = desc->node[i].hwdesc;
residue += STM32_MDMA_CBNDTR_BNDT(hwdesc->cbndtr);
}
cbndtr = stm32_mdma_read(dmadev, STM32_MDMA_CBNDTR(chan->id));
residue += cbndtr & STM32_MDMA_CBNDTR_BNDT_MASK;
if (!chan->mem_burst)
return residue;
burst_size = chan->mem_burst * chan->mem_width;
modulo = residue % burst_size;
if (modulo)
residue = residue - modulo + burst_size;
return residue;
}
static enum dma_status stm32_mdma_tx_status(struct dma_chan *c,
dma_cookie_t cookie,
struct dma_tx_state *state)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
struct virt_dma_desc *vdesc;
enum dma_status status;
unsigned long flags;
u32 residue = 0;
status = dma_cookie_status(c, cookie, state);
if ((status == DMA_COMPLETE) || (!state))
return status;
spin_lock_irqsave(&chan->vchan.lock, flags);
vdesc = vchan_find_desc(&chan->vchan, cookie);
if (chan->desc && cookie == chan->desc->vdesc.tx.cookie)
residue = stm32_mdma_desc_residue(chan, chan->desc,
chan->curr_hwdesc);
else if (vdesc)
residue = stm32_mdma_desc_residue(chan,
to_stm32_mdma_desc(vdesc), 0);
dma_set_residue(state, residue);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
return status;
}
static void stm32_mdma_xfer_end(struct stm32_mdma_chan *chan)
{
vchan_cookie_complete(&chan->desc->vdesc);
chan->desc = NULL;
chan->busy = false;
/* Start the next transfer if this driver has a next desc */
stm32_mdma_start_transfer(chan);
}
static irqreturn_t stm32_mdma_irq_handler(int irq, void *devid)
{
struct stm32_mdma_device *dmadev = devid;
struct stm32_mdma_chan *chan;
u32 reg, id, ccr, ien, status;
/* Find out which channel generates the interrupt */
status = readl_relaxed(dmadev->base + STM32_MDMA_GISR0);
if (!status) {
dev_dbg(mdma2dev(dmadev), "spurious it\n");
return IRQ_NONE;
}
id = __ffs(status);
chan = &dmadev->chan[id];
/* Handle interrupt for the channel */
spin_lock(&chan->vchan.lock);
status = stm32_mdma_read(dmadev, STM32_MDMA_CISR(id));
/* Mask Channel ReQuest Active bit which can be set in case of MEM2MEM */
status &= ~STM32_MDMA_CISR_CRQA;
ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
ien = (ccr & STM32_MDMA_CCR_IRQ_MASK) >> 1;
if (!(status & ien)) {
spin_unlock(&chan->vchan.lock);
if (chan->busy)
dev_warn(chan2dev(chan),
"spurious it (status=0x%04x, ien=0x%04x)\n", status, ien);
else
dev_dbg(chan2dev(chan),
"spurious it (status=0x%04x, ien=0x%04x)\n", status, ien);
return IRQ_NONE;
}
reg = STM32_MDMA_CIFCR(id);
if (status & STM32_MDMA_CISR_TEIF) {
dev_err(chan2dev(chan), "Transfer Err: stat=0x%08x\n",
readl_relaxed(dmadev->base + STM32_MDMA_CESR(id)));
stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CTEIF);
status &= ~STM32_MDMA_CISR_TEIF;
}
if (status & STM32_MDMA_CISR_CTCIF) {
stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CCTCIF);
status &= ~STM32_MDMA_CISR_CTCIF;
stm32_mdma_xfer_end(chan);
}
if (status & STM32_MDMA_CISR_BRTIF) {
stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBRTIF);
status &= ~STM32_MDMA_CISR_BRTIF;
}
if (status & STM32_MDMA_CISR_BTIF) {
stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CBTIF);
status &= ~STM32_MDMA_CISR_BTIF;
chan->curr_hwdesc++;
if (chan->desc && chan->desc->cyclic) {
if (chan->curr_hwdesc == chan->desc->count)
chan->curr_hwdesc = 0;
vchan_cyclic_callback(&chan->desc->vdesc);
}
}
if (status & STM32_MDMA_CISR_TCIF) {
stm32_mdma_set_bits(dmadev, reg, STM32_MDMA_CIFCR_CLTCIF);
status &= ~STM32_MDMA_CISR_TCIF;
}
if (status) {
stm32_mdma_set_bits(dmadev, reg, status);
dev_err(chan2dev(chan), "DMA error: status=0x%08x\n", status);
if (!(ccr & STM32_MDMA_CCR_EN))
dev_err(chan2dev(chan), "chan disabled by HW\n");
}
spin_unlock(&chan->vchan.lock);
return IRQ_HANDLED;
}
static int stm32_mdma_alloc_chan_resources(struct dma_chan *c)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
int ret;
chan->desc_pool = dmam_pool_create(dev_name(&c->dev->device),
c->device->dev,
sizeof(struct stm32_mdma_hwdesc),
__alignof__(struct stm32_mdma_hwdesc),
0);
if (!chan->desc_pool) {
dev_err(chan2dev(chan), "failed to allocate descriptor pool\n");
return -ENOMEM;
}
ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
if (ret < 0)
return ret;
ret = stm32_mdma_disable_chan(chan);
if (ret < 0)
pm_runtime_put(dmadev->ddev.dev);
return ret;
}
static void stm32_mdma_free_chan_resources(struct dma_chan *c)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
unsigned long flags;
dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id);
if (chan->busy) {
spin_lock_irqsave(&chan->vchan.lock, flags);
stm32_mdma_stop(chan);
chan->desc = NULL;
spin_unlock_irqrestore(&chan->vchan.lock, flags);
}
pm_runtime_put(dmadev->ddev.dev);
vchan_free_chan_resources(to_virt_chan(c));
dmam_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
}
static bool stm32_mdma_filter_fn(struct dma_chan *c, void *fn_param)
{
struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
/* Check if chan is marked Secure */
if (dmadev->chan_reserved & BIT(chan->id))
return false;
return true;
}
static struct dma_chan *stm32_mdma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct stm32_mdma_device *dmadev = ofdma->of_dma_data;
dma_cap_mask_t mask = dmadev->ddev.cap_mask;
struct stm32_mdma_chan *chan;
struct dma_chan *c;
struct stm32_mdma_chan_config config;
if (dma_spec->args_count < 5) {
dev_err(mdma2dev(dmadev), "Bad number of args\n");
return NULL;
}
memset(&config, 0, sizeof(config));
config.request = dma_spec->args[0];
config.priority_level = dma_spec->args[1];
config.transfer_config = dma_spec->args[2];
config.mask_addr = dma_spec->args[3];
config.mask_data = dma_spec->args[4];
if (config.request >= dmadev->nr_requests) {
dev_err(mdma2dev(dmadev), "Bad request line\n");
return NULL;
}
if (config.priority_level > STM32_MDMA_VERY_HIGH_PRIORITY) {
dev_err(mdma2dev(dmadev), "Priority level not supported\n");
return NULL;
}
c = __dma_request_channel(&mask, stm32_mdma_filter_fn, &config, ofdma->of_node);
if (!c) {
dev_err(mdma2dev(dmadev), "No more channels available\n");
return NULL;
}
chan = to_stm32_mdma_chan(c);
chan->chan_config = config;
return c;
}
static const struct of_device_id stm32_mdma_of_match[] = {
{ .compatible = "st,stm32h7-mdma", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, stm32_mdma_of_match);
static int stm32_mdma_probe(struct platform_device *pdev)
{
struct stm32_mdma_chan *chan;
struct stm32_mdma_device *dmadev;
struct dma_device *dd;
struct device_node *of_node;
struct reset_control *rst;
u32 nr_channels, nr_requests;
int i, count, ret;
of_node = pdev->dev.of_node;
if (!of_node)
return -ENODEV;
ret = device_property_read_u32(&pdev->dev, "dma-channels",
&nr_channels);
if (ret) {
nr_channels = STM32_MDMA_MAX_CHANNELS;
dev_warn(&pdev->dev, "MDMA defaulting on %i channels\n",
nr_channels);
}
ret = device_property_read_u32(&pdev->dev, "dma-requests",
&nr_requests);
if (ret) {
nr_requests = STM32_MDMA_MAX_REQUESTS;
dev_warn(&pdev->dev, "MDMA defaulting on %i request lines\n",
nr_requests);
}
count = device_property_count_u32(&pdev->dev, "st,ahb-addr-masks");
if (count < 0)
count = 0;
dmadev = devm_kzalloc(&pdev->dev,
struct_size(dmadev, ahb_addr_masks, count),
GFP_KERNEL);
if (!dmadev)
return -ENOMEM;
dmadev->nr_channels = nr_channels;
dmadev->nr_requests = nr_requests;
device_property_read_u32_array(&pdev->dev, "st,ahb-addr-masks",
dmadev->ahb_addr_masks,
count);
dmadev->nr_ahb_addr_masks = count;
dmadev->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(dmadev->base))
return PTR_ERR(dmadev->base);
dmadev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(dmadev->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(dmadev->clk),
"Missing clock controller\n");
ret = clk_prepare_enable(dmadev->clk);
if (ret < 0) {
dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret);
return ret;
}
rst = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(rst)) {
ret = PTR_ERR(rst);
if (ret == -EPROBE_DEFER)
goto err_clk;
} else {
reset_control_assert(rst);
udelay(2);
reset_control_deassert(rst);
}
dd = &dmadev->ddev;
dma_cap_set(DMA_SLAVE, dd->cap_mask);
dma_cap_set(DMA_PRIVATE, dd->cap_mask);
dma_cap_set(DMA_CYCLIC, dd->cap_mask);
dma_cap_set(DMA_MEMCPY, dd->cap_mask);
dd->device_alloc_chan_resources = stm32_mdma_alloc_chan_resources;
dd->device_free_chan_resources = stm32_mdma_free_chan_resources;
dd->device_tx_status = stm32_mdma_tx_status;
dd->device_issue_pending = stm32_mdma_issue_pending;
dd->device_prep_slave_sg = stm32_mdma_prep_slave_sg;
dd->device_prep_dma_cyclic = stm32_mdma_prep_dma_cyclic;
dd->device_prep_dma_memcpy = stm32_mdma_prep_dma_memcpy;
dd->device_config = stm32_mdma_slave_config;
dd->device_pause = stm32_mdma_pause;
dd->device_resume = stm32_mdma_resume;
dd->device_terminate_all = stm32_mdma_terminate_all;
dd->device_synchronize = stm32_mdma_synchronize;
dd->descriptor_reuse = true;
dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
BIT(DMA_MEM_TO_MEM);
dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
dd->max_burst = STM32_MDMA_MAX_BURST;
dd->dev = &pdev->dev;
INIT_LIST_HEAD(&dd->channels);
for (i = 0; i < dmadev->nr_channels; i++) {
chan = &dmadev->chan[i];
chan->id = i;
if (stm32_mdma_read(dmadev, STM32_MDMA_CCR(i)) & STM32_MDMA_CCR_SM)
dmadev->chan_reserved |= BIT(i);
chan->vchan.desc_free = stm32_mdma_desc_free;
vchan_init(&chan->vchan, dd);
}
dmadev->irq = platform_get_irq(pdev, 0);
if (dmadev->irq < 0) {
ret = dmadev->irq;
goto err_clk;
}
ret = devm_request_irq(&pdev->dev, dmadev->irq, stm32_mdma_irq_handler,
0, dev_name(&pdev->dev), dmadev);
if (ret) {
dev_err(&pdev->dev, "failed to request IRQ\n");
goto err_clk;
}
ret = dmaenginem_async_device_register(dd);
if (ret)
goto err_clk;
ret = of_dma_controller_register(of_node, stm32_mdma_of_xlate, dmadev);
if (ret < 0) {
dev_err(&pdev->dev,
"STM32 MDMA DMA OF registration failed %d\n", ret);
goto err_clk;
}
platform_set_drvdata(pdev, dmadev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_put(&pdev->dev);
dev_info(&pdev->dev, "STM32 MDMA driver registered\n");
return 0;
err_clk:
clk_disable_unprepare(dmadev->clk);
return ret;
}
#ifdef CONFIG_PM
static int stm32_mdma_runtime_suspend(struct device *dev)
{
struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
clk_disable_unprepare(dmadev->clk);
return 0;
}
static int stm32_mdma_runtime_resume(struct device *dev)
{
struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(dmadev->clk);
if (ret) {
dev_err(dev, "failed to prepare_enable clock\n");
return ret;
}
return 0;
}
#endif
#ifdef CONFIG_PM_SLEEP
static int stm32_mdma_pm_suspend(struct device *dev)
{
struct stm32_mdma_device *dmadev = dev_get_drvdata(dev);
u32 ccr, id;
int ret;
ret = pm_runtime_resume_and_get(dev);
if (ret < 0)
return ret;
for (id = 0; id < dmadev->nr_channels; id++) {
ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
if (ccr & STM32_MDMA_CCR_EN) {
dev_warn(dev, "Suspend is prevented by Chan %i\n", id);
return -EBUSY;
}
}
pm_runtime_put_sync(dev);
pm_runtime_force_suspend(dev);
return 0;
}
static int stm32_mdma_pm_resume(struct device *dev)
{
return pm_runtime_force_resume(dev);
}
#endif
static const struct dev_pm_ops stm32_mdma_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(stm32_mdma_pm_suspend, stm32_mdma_pm_resume)
SET_RUNTIME_PM_OPS(stm32_mdma_runtime_suspend,
stm32_mdma_runtime_resume, NULL)
};
static struct platform_driver stm32_mdma_driver = {
.probe = stm32_mdma_probe,
.driver = {
.name = "stm32-mdma",
.of_match_table = stm32_mdma_of_match,
.pm = &stm32_mdma_pm_ops,
},
};
static int __init stm32_mdma_init(void)
{
return platform_driver_register(&stm32_mdma_driver);
}
subsys_initcall(stm32_mdma_init);
MODULE_DESCRIPTION("Driver for STM32 MDMA controller");
MODULE_AUTHOR("M'boumba Cedric Madianga <[email protected]>");
MODULE_AUTHOR("Pierre-Yves Mordret <[email protected]>");
| linux-master | drivers/dma/stm32-mdma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Topcliff PCH DMA controller driver
* Copyright (c) 2010 Intel Corporation
* Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
*/
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pch_dma.h>
#include "dmaengine.h"
#define DRV_NAME "pch-dma"
#define DMA_CTL0_DISABLE 0x0
#define DMA_CTL0_SG 0x1
#define DMA_CTL0_ONESHOT 0x2
#define DMA_CTL0_MODE_MASK_BITS 0x3
#define DMA_CTL0_DIR_SHIFT_BITS 2
#define DMA_CTL0_BITS_PER_CH 4
#define DMA_CTL2_START_SHIFT_BITS 8
#define DMA_CTL2_IRQ_ENABLE_MASK ((1UL << DMA_CTL2_START_SHIFT_BITS) - 1)
#define DMA_STATUS_IDLE 0x0
#define DMA_STATUS_DESC_READ 0x1
#define DMA_STATUS_WAIT 0x2
#define DMA_STATUS_ACCESS 0x3
#define DMA_STATUS_BITS_PER_CH 2
#define DMA_STATUS_MASK_BITS 0x3
#define DMA_STATUS_SHIFT_BITS 16
#define DMA_STATUS_IRQ(x) (0x1 << (x))
#define DMA_STATUS0_ERR(x) (0x1 << ((x) + 8))
#define DMA_STATUS2_ERR(x) (0x1 << (x))
#define DMA_DESC_WIDTH_SHIFT_BITS 12
#define DMA_DESC_WIDTH_1_BYTE (0x3 << DMA_DESC_WIDTH_SHIFT_BITS)
#define DMA_DESC_WIDTH_2_BYTES (0x2 << DMA_DESC_WIDTH_SHIFT_BITS)
#define DMA_DESC_WIDTH_4_BYTES (0x0 << DMA_DESC_WIDTH_SHIFT_BITS)
#define DMA_DESC_MAX_COUNT_1_BYTE 0x3FF
#define DMA_DESC_MAX_COUNT_2_BYTES 0x3FF
#define DMA_DESC_MAX_COUNT_4_BYTES 0x7FF
#define DMA_DESC_END_WITHOUT_IRQ 0x0
#define DMA_DESC_END_WITH_IRQ 0x1
#define DMA_DESC_FOLLOW_WITHOUT_IRQ 0x2
#define DMA_DESC_FOLLOW_WITH_IRQ 0x3
#define MAX_CHAN_NR 12
#define DMA_MASK_CTL0_MODE 0x33333333
#define DMA_MASK_CTL2_MODE 0x00003333
static unsigned int init_nr_desc_per_channel = 64;
module_param(init_nr_desc_per_channel, uint, 0644);
MODULE_PARM_DESC(init_nr_desc_per_channel,
"initial descriptors per channel (default: 64)");
struct pch_dma_desc_regs {
u32 dev_addr;
u32 mem_addr;
u32 size;
u32 next;
};
struct pch_dma_regs {
u32 dma_ctl0;
u32 dma_ctl1;
u32 dma_ctl2;
u32 dma_ctl3;
u32 dma_sts0;
u32 dma_sts1;
u32 dma_sts2;
u32 reserved3;
struct pch_dma_desc_regs desc[MAX_CHAN_NR];
};
struct pch_dma_desc {
struct pch_dma_desc_regs regs;
struct dma_async_tx_descriptor txd;
struct list_head desc_node;
struct list_head tx_list;
};
struct pch_dma_chan {
struct dma_chan chan;
void __iomem *membase;
enum dma_transfer_direction dir;
struct tasklet_struct tasklet;
unsigned long err_status;
spinlock_t lock;
struct list_head active_list;
struct list_head queue;
struct list_head free_list;
unsigned int descs_allocated;
};
#define PDC_DEV_ADDR 0x00
#define PDC_MEM_ADDR 0x04
#define PDC_SIZE 0x08
#define PDC_NEXT 0x0C
#define channel_readl(pdc, name) \
readl((pdc)->membase + PDC_##name)
#define channel_writel(pdc, name, val) \
writel((val), (pdc)->membase + PDC_##name)
struct pch_dma {
struct dma_device dma;
void __iomem *membase;
struct dma_pool *pool;
struct pch_dma_regs regs;
struct pch_dma_desc_regs ch_regs[MAX_CHAN_NR];
struct pch_dma_chan channels[MAX_CHAN_NR];
};
#define PCH_DMA_CTL0 0x00
#define PCH_DMA_CTL1 0x04
#define PCH_DMA_CTL2 0x08
#define PCH_DMA_CTL3 0x0C
#define PCH_DMA_STS0 0x10
#define PCH_DMA_STS1 0x14
#define PCH_DMA_STS2 0x18
#define dma_readl(pd, name) \
readl((pd)->membase + PCH_DMA_##name)
#define dma_writel(pd, name, val) \
writel((val), (pd)->membase + PCH_DMA_##name)
static inline
struct pch_dma_desc *to_pd_desc(struct dma_async_tx_descriptor *txd)
{
return container_of(txd, struct pch_dma_desc, txd);
}
static inline struct pch_dma_chan *to_pd_chan(struct dma_chan *chan)
{
return container_of(chan, struct pch_dma_chan, chan);
}
static inline struct pch_dma *to_pd(struct dma_device *ddev)
{
return container_of(ddev, struct pch_dma, dma);
}
static inline struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static inline struct device *chan2parent(struct dma_chan *chan)
{
return chan->dev->device.parent;
}
static inline
struct pch_dma_desc *pdc_first_active(struct pch_dma_chan *pd_chan)
{
return list_first_entry(&pd_chan->active_list,
struct pch_dma_desc, desc_node);
}
static inline
struct pch_dma_desc *pdc_first_queued(struct pch_dma_chan *pd_chan)
{
return list_first_entry(&pd_chan->queue,
struct pch_dma_desc, desc_node);
}
static void pdc_enable_irq(struct dma_chan *chan, int enable)
{
struct pch_dma *pd = to_pd(chan->device);
u32 val;
int pos;
if (chan->chan_id < 8)
pos = chan->chan_id;
else
pos = chan->chan_id + 8;
val = dma_readl(pd, CTL2);
if (enable)
val |= 0x1 << pos;
else
val &= ~(0x1 << pos);
dma_writel(pd, CTL2, val);
dev_dbg(chan2dev(chan), "pdc_enable_irq: chan %d -> %x\n",
chan->chan_id, val);
}
static void pdc_set_dir(struct dma_chan *chan)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma *pd = to_pd(chan->device);
u32 val;
u32 mask_mode;
u32 mask_ctl;
if (chan->chan_id < 8) {
val = dma_readl(pd, CTL0);
mask_mode = DMA_CTL0_MODE_MASK_BITS <<
(DMA_CTL0_BITS_PER_CH * chan->chan_id);
mask_ctl = DMA_MASK_CTL0_MODE & ~(DMA_CTL0_MODE_MASK_BITS <<
(DMA_CTL0_BITS_PER_CH * chan->chan_id));
val &= mask_mode;
if (pd_chan->dir == DMA_MEM_TO_DEV)
val |= 0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +
DMA_CTL0_DIR_SHIFT_BITS);
else
val &= ~(0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +
DMA_CTL0_DIR_SHIFT_BITS));
val |= mask_ctl;
dma_writel(pd, CTL0, val);
} else {
int ch = chan->chan_id - 8; /* ch8-->0 ch9-->1 ... ch11->3 */
val = dma_readl(pd, CTL3);
mask_mode = DMA_CTL0_MODE_MASK_BITS <<
(DMA_CTL0_BITS_PER_CH * ch);
mask_ctl = DMA_MASK_CTL2_MODE & ~(DMA_CTL0_MODE_MASK_BITS <<
(DMA_CTL0_BITS_PER_CH * ch));
val &= mask_mode;
if (pd_chan->dir == DMA_MEM_TO_DEV)
val |= 0x1 << (DMA_CTL0_BITS_PER_CH * ch +
DMA_CTL0_DIR_SHIFT_BITS);
else
val &= ~(0x1 << (DMA_CTL0_BITS_PER_CH * ch +
DMA_CTL0_DIR_SHIFT_BITS));
val |= mask_ctl;
dma_writel(pd, CTL3, val);
}
dev_dbg(chan2dev(chan), "pdc_set_dir: chan %d -> %x\n",
chan->chan_id, val);
}
static void pdc_set_mode(struct dma_chan *chan, u32 mode)
{
struct pch_dma *pd = to_pd(chan->device);
u32 val;
u32 mask_ctl;
u32 mask_dir;
if (chan->chan_id < 8) {
mask_ctl = DMA_MASK_CTL0_MODE & ~(DMA_CTL0_MODE_MASK_BITS <<
(DMA_CTL0_BITS_PER_CH * chan->chan_id));
mask_dir = 1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +\
DMA_CTL0_DIR_SHIFT_BITS);
val = dma_readl(pd, CTL0);
val &= mask_dir;
val |= mode << (DMA_CTL0_BITS_PER_CH * chan->chan_id);
val |= mask_ctl;
dma_writel(pd, CTL0, val);
} else {
int ch = chan->chan_id - 8; /* ch8-->0 ch9-->1 ... ch11->3 */
mask_ctl = DMA_MASK_CTL2_MODE & ~(DMA_CTL0_MODE_MASK_BITS <<
(DMA_CTL0_BITS_PER_CH * ch));
mask_dir = 1 << (DMA_CTL0_BITS_PER_CH * ch +\
DMA_CTL0_DIR_SHIFT_BITS);
val = dma_readl(pd, CTL3);
val &= mask_dir;
val |= mode << (DMA_CTL0_BITS_PER_CH * ch);
val |= mask_ctl;
dma_writel(pd, CTL3, val);
}
dev_dbg(chan2dev(chan), "pdc_set_mode: chan %d -> %x\n",
chan->chan_id, val);
}
static u32 pdc_get_status0(struct pch_dma_chan *pd_chan)
{
struct pch_dma *pd = to_pd(pd_chan->chan.device);
u32 val;
val = dma_readl(pd, STS0);
return DMA_STATUS_MASK_BITS & (val >> (DMA_STATUS_SHIFT_BITS +
DMA_STATUS_BITS_PER_CH * pd_chan->chan.chan_id));
}
static u32 pdc_get_status2(struct pch_dma_chan *pd_chan)
{
struct pch_dma *pd = to_pd(pd_chan->chan.device);
u32 val;
val = dma_readl(pd, STS2);
return DMA_STATUS_MASK_BITS & (val >> (DMA_STATUS_SHIFT_BITS +
DMA_STATUS_BITS_PER_CH * (pd_chan->chan.chan_id - 8)));
}
static bool pdc_is_idle(struct pch_dma_chan *pd_chan)
{
u32 sts;
if (pd_chan->chan.chan_id < 8)
sts = pdc_get_status0(pd_chan);
else
sts = pdc_get_status2(pd_chan);
if (sts == DMA_STATUS_IDLE)
return true;
else
return false;
}
static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc)
{
if (!pdc_is_idle(pd_chan)) {
dev_err(chan2dev(&pd_chan->chan),
"BUG: Attempt to start non-idle channel\n");
return;
}
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> dev_addr: %x\n",
pd_chan->chan.chan_id, desc->regs.dev_addr);
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> mem_addr: %x\n",
pd_chan->chan.chan_id, desc->regs.mem_addr);
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> size: %x\n",
pd_chan->chan.chan_id, desc->regs.size);
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> next: %x\n",
pd_chan->chan.chan_id, desc->regs.next);
if (list_empty(&desc->tx_list)) {
channel_writel(pd_chan, DEV_ADDR, desc->regs.dev_addr);
channel_writel(pd_chan, MEM_ADDR, desc->regs.mem_addr);
channel_writel(pd_chan, SIZE, desc->regs.size);
channel_writel(pd_chan, NEXT, desc->regs.next);
pdc_set_mode(&pd_chan->chan, DMA_CTL0_ONESHOT);
} else {
channel_writel(pd_chan, NEXT, desc->txd.phys);
pdc_set_mode(&pd_chan->chan, DMA_CTL0_SG);
}
}
static void pdc_chain_complete(struct pch_dma_chan *pd_chan,
struct pch_dma_desc *desc)
{
struct dma_async_tx_descriptor *txd = &desc->txd;
struct dmaengine_desc_callback cb;
dmaengine_desc_get_callback(txd, &cb);
list_splice_init(&desc->tx_list, &pd_chan->free_list);
list_move(&desc->desc_node, &pd_chan->free_list);
dmaengine_desc_callback_invoke(&cb, NULL);
}
static void pdc_complete_all(struct pch_dma_chan *pd_chan)
{
struct pch_dma_desc *desc, *_d;
LIST_HEAD(list);
BUG_ON(!pdc_is_idle(pd_chan));
if (!list_empty(&pd_chan->queue))
pdc_dostart(pd_chan, pdc_first_queued(pd_chan));
list_splice_init(&pd_chan->active_list, &list);
list_splice_init(&pd_chan->queue, &pd_chan->active_list);
list_for_each_entry_safe(desc, _d, &list, desc_node)
pdc_chain_complete(pd_chan, desc);
}
static void pdc_handle_error(struct pch_dma_chan *pd_chan)
{
struct pch_dma_desc *bad_desc;
bad_desc = pdc_first_active(pd_chan);
list_del(&bad_desc->desc_node);
list_splice_init(&pd_chan->queue, pd_chan->active_list.prev);
if (!list_empty(&pd_chan->active_list))
pdc_dostart(pd_chan, pdc_first_active(pd_chan));
dev_crit(chan2dev(&pd_chan->chan), "Bad descriptor submitted\n");
dev_crit(chan2dev(&pd_chan->chan), "descriptor cookie: %d\n",
bad_desc->txd.cookie);
pdc_chain_complete(pd_chan, bad_desc);
}
static void pdc_advance_work(struct pch_dma_chan *pd_chan)
{
if (list_empty(&pd_chan->active_list) ||
list_is_singular(&pd_chan->active_list)) {
pdc_complete_all(pd_chan);
} else {
pdc_chain_complete(pd_chan, pdc_first_active(pd_chan));
pdc_dostart(pd_chan, pdc_first_active(pd_chan));
}
}
static dma_cookie_t pd_tx_submit(struct dma_async_tx_descriptor *txd)
{
struct pch_dma_desc *desc = to_pd_desc(txd);
struct pch_dma_chan *pd_chan = to_pd_chan(txd->chan);
spin_lock(&pd_chan->lock);
if (list_empty(&pd_chan->active_list)) {
list_add_tail(&desc->desc_node, &pd_chan->active_list);
pdc_dostart(pd_chan, desc);
} else {
list_add_tail(&desc->desc_node, &pd_chan->queue);
}
spin_unlock(&pd_chan->lock);
return 0;
}
static struct pch_dma_desc *pdc_alloc_desc(struct dma_chan *chan, gfp_t flags)
{
struct pch_dma_desc *desc = NULL;
struct pch_dma *pd = to_pd(chan->device);
dma_addr_t addr;
desc = dma_pool_zalloc(pd->pool, flags, &addr);
if (desc) {
INIT_LIST_HEAD(&desc->tx_list);
dma_async_tx_descriptor_init(&desc->txd, chan);
desc->txd.tx_submit = pd_tx_submit;
desc->txd.flags = DMA_CTRL_ACK;
desc->txd.phys = addr;
}
return desc;
}
static struct pch_dma_desc *pdc_desc_get(struct pch_dma_chan *pd_chan)
{
struct pch_dma_desc *desc, *_d;
struct pch_dma_desc *ret = NULL;
int i = 0;
spin_lock(&pd_chan->lock);
list_for_each_entry_safe(desc, _d, &pd_chan->free_list, desc_node) {
i++;
if (async_tx_test_ack(&desc->txd)) {
list_del(&desc->desc_node);
ret = desc;
break;
}
dev_dbg(chan2dev(&pd_chan->chan), "desc %p not ACKed\n", desc);
}
spin_unlock(&pd_chan->lock);
dev_dbg(chan2dev(&pd_chan->chan), "scanned %d descriptors\n", i);
if (!ret) {
ret = pdc_alloc_desc(&pd_chan->chan, GFP_ATOMIC);
if (ret) {
spin_lock(&pd_chan->lock);
pd_chan->descs_allocated++;
spin_unlock(&pd_chan->lock);
} else {
dev_err(chan2dev(&pd_chan->chan),
"failed to alloc desc\n");
}
}
return ret;
}
static void pdc_desc_put(struct pch_dma_chan *pd_chan,
struct pch_dma_desc *desc)
{
if (desc) {
spin_lock(&pd_chan->lock);
list_splice_init(&desc->tx_list, &pd_chan->free_list);
list_add(&desc->desc_node, &pd_chan->free_list);
spin_unlock(&pd_chan->lock);
}
}
static int pd_alloc_chan_resources(struct dma_chan *chan)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma_desc *desc;
LIST_HEAD(tmp_list);
int i;
if (!pdc_is_idle(pd_chan)) {
dev_dbg(chan2dev(chan), "DMA channel not idle ?\n");
return -EIO;
}
if (!list_empty(&pd_chan->free_list))
return pd_chan->descs_allocated;
for (i = 0; i < init_nr_desc_per_channel; i++) {
desc = pdc_alloc_desc(chan, GFP_KERNEL);
if (!desc) {
dev_warn(chan2dev(chan),
"Only allocated %d initial descriptors\n", i);
break;
}
list_add_tail(&desc->desc_node, &tmp_list);
}
spin_lock_irq(&pd_chan->lock);
list_splice(&tmp_list, &pd_chan->free_list);
pd_chan->descs_allocated = i;
dma_cookie_init(chan);
spin_unlock_irq(&pd_chan->lock);
pdc_enable_irq(chan, 1);
return pd_chan->descs_allocated;
}
static void pd_free_chan_resources(struct dma_chan *chan)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma *pd = to_pd(chan->device);
struct pch_dma_desc *desc, *_d;
LIST_HEAD(tmp_list);
BUG_ON(!pdc_is_idle(pd_chan));
BUG_ON(!list_empty(&pd_chan->active_list));
BUG_ON(!list_empty(&pd_chan->queue));
spin_lock_irq(&pd_chan->lock);
list_splice_init(&pd_chan->free_list, &tmp_list);
pd_chan->descs_allocated = 0;
spin_unlock_irq(&pd_chan->lock);
list_for_each_entry_safe(desc, _d, &tmp_list, desc_node)
dma_pool_free(pd->pool, desc, desc->txd.phys);
pdc_enable_irq(chan, 0);
}
static enum dma_status pd_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(chan, cookie, txstate);
}
static void pd_issue_pending(struct dma_chan *chan)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
if (pdc_is_idle(pd_chan)) {
spin_lock(&pd_chan->lock);
pdc_advance_work(pd_chan);
spin_unlock(&pd_chan->lock);
}
}
static struct dma_async_tx_descriptor *pd_prep_slave_sg(struct dma_chan *chan,
struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long flags,
void *context)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma_slave *pd_slave = chan->private;
struct pch_dma_desc *first = NULL;
struct pch_dma_desc *prev = NULL;
struct pch_dma_desc *desc = NULL;
struct scatterlist *sg;
dma_addr_t reg;
int i;
if (unlikely(!sg_len)) {
dev_info(chan2dev(chan), "prep_slave_sg: length is zero!\n");
return NULL;
}
if (direction == DMA_DEV_TO_MEM)
reg = pd_slave->rx_reg;
else if (direction == DMA_MEM_TO_DEV)
reg = pd_slave->tx_reg;
else
return NULL;
pd_chan->dir = direction;
pdc_set_dir(chan);
for_each_sg(sgl, sg, sg_len, i) {
desc = pdc_desc_get(pd_chan);
if (!desc)
goto err_desc_get;
desc->regs.dev_addr = reg;
desc->regs.mem_addr = sg_dma_address(sg);
desc->regs.size = sg_dma_len(sg);
desc->regs.next = DMA_DESC_FOLLOW_WITHOUT_IRQ;
switch (pd_slave->width) {
case PCH_DMA_WIDTH_1_BYTE:
if (desc->regs.size > DMA_DESC_MAX_COUNT_1_BYTE)
goto err_desc_get;
desc->regs.size |= DMA_DESC_WIDTH_1_BYTE;
break;
case PCH_DMA_WIDTH_2_BYTES:
if (desc->regs.size > DMA_DESC_MAX_COUNT_2_BYTES)
goto err_desc_get;
desc->regs.size |= DMA_DESC_WIDTH_2_BYTES;
break;
case PCH_DMA_WIDTH_4_BYTES:
if (desc->regs.size > DMA_DESC_MAX_COUNT_4_BYTES)
goto err_desc_get;
desc->regs.size |= DMA_DESC_WIDTH_4_BYTES;
break;
default:
goto err_desc_get;
}
if (!first) {
first = desc;
} else {
prev->regs.next |= desc->txd.phys;
list_add_tail(&desc->desc_node, &first->tx_list);
}
prev = desc;
}
if (flags & DMA_PREP_INTERRUPT)
desc->regs.next = DMA_DESC_END_WITH_IRQ;
else
desc->regs.next = DMA_DESC_END_WITHOUT_IRQ;
first->txd.cookie = -EBUSY;
desc->txd.flags = flags;
return &first->txd;
err_desc_get:
dev_err(chan2dev(chan), "failed to get desc or wrong parameters\n");
pdc_desc_put(pd_chan, first);
return NULL;
}
static int pd_device_terminate_all(struct dma_chan *chan)
{
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
struct pch_dma_desc *desc, *_d;
LIST_HEAD(list);
spin_lock_irq(&pd_chan->lock);
pdc_set_mode(&pd_chan->chan, DMA_CTL0_DISABLE);
list_splice_init(&pd_chan->active_list, &list);
list_splice_init(&pd_chan->queue, &list);
list_for_each_entry_safe(desc, _d, &list, desc_node)
pdc_chain_complete(pd_chan, desc);
spin_unlock_irq(&pd_chan->lock);
return 0;
}
static void pdc_tasklet(struct tasklet_struct *t)
{
struct pch_dma_chan *pd_chan = from_tasklet(pd_chan, t, tasklet);
unsigned long flags;
if (!pdc_is_idle(pd_chan)) {
dev_err(chan2dev(&pd_chan->chan),
"BUG: handle non-idle channel in tasklet\n");
return;
}
spin_lock_irqsave(&pd_chan->lock, flags);
if (test_and_clear_bit(0, &pd_chan->err_status))
pdc_handle_error(pd_chan);
else
pdc_advance_work(pd_chan);
spin_unlock_irqrestore(&pd_chan->lock, flags);
}
static irqreturn_t pd_irq(int irq, void *devid)
{
struct pch_dma *pd = (struct pch_dma *)devid;
struct pch_dma_chan *pd_chan;
u32 sts0;
u32 sts2;
int i;
int ret0 = IRQ_NONE;
int ret2 = IRQ_NONE;
sts0 = dma_readl(pd, STS0);
sts2 = dma_readl(pd, STS2);
dev_dbg(pd->dma.dev, "pd_irq sts0: %x\n", sts0);
for (i = 0; i < pd->dma.chancnt; i++) {
pd_chan = &pd->channels[i];
if (i < 8) {
if (sts0 & DMA_STATUS_IRQ(i)) {
if (sts0 & DMA_STATUS0_ERR(i))
set_bit(0, &pd_chan->err_status);
tasklet_schedule(&pd_chan->tasklet);
ret0 = IRQ_HANDLED;
}
} else {
if (sts2 & DMA_STATUS_IRQ(i - 8)) {
if (sts2 & DMA_STATUS2_ERR(i))
set_bit(0, &pd_chan->err_status);
tasklet_schedule(&pd_chan->tasklet);
ret2 = IRQ_HANDLED;
}
}
}
/* clear interrupt bits in status register */
if (ret0)
dma_writel(pd, STS0, sts0);
if (ret2)
dma_writel(pd, STS2, sts2);
return ret0 | ret2;
}
static void __maybe_unused pch_dma_save_regs(struct pch_dma *pd)
{
struct pch_dma_chan *pd_chan;
struct dma_chan *chan, *_c;
int i = 0;
pd->regs.dma_ctl0 = dma_readl(pd, CTL0);
pd->regs.dma_ctl1 = dma_readl(pd, CTL1);
pd->regs.dma_ctl2 = dma_readl(pd, CTL2);
pd->regs.dma_ctl3 = dma_readl(pd, CTL3);
list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
pd_chan = to_pd_chan(chan);
pd->ch_regs[i].dev_addr = channel_readl(pd_chan, DEV_ADDR);
pd->ch_regs[i].mem_addr = channel_readl(pd_chan, MEM_ADDR);
pd->ch_regs[i].size = channel_readl(pd_chan, SIZE);
pd->ch_regs[i].next = channel_readl(pd_chan, NEXT);
i++;
}
}
static void __maybe_unused pch_dma_restore_regs(struct pch_dma *pd)
{
struct pch_dma_chan *pd_chan;
struct dma_chan *chan, *_c;
int i = 0;
dma_writel(pd, CTL0, pd->regs.dma_ctl0);
dma_writel(pd, CTL1, pd->regs.dma_ctl1);
dma_writel(pd, CTL2, pd->regs.dma_ctl2);
dma_writel(pd, CTL3, pd->regs.dma_ctl3);
list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
pd_chan = to_pd_chan(chan);
channel_writel(pd_chan, DEV_ADDR, pd->ch_regs[i].dev_addr);
channel_writel(pd_chan, MEM_ADDR, pd->ch_regs[i].mem_addr);
channel_writel(pd_chan, SIZE, pd->ch_regs[i].size);
channel_writel(pd_chan, NEXT, pd->ch_regs[i].next);
i++;
}
}
static int __maybe_unused pch_dma_suspend(struct device *dev)
{
struct pch_dma *pd = dev_get_drvdata(dev);
if (pd)
pch_dma_save_regs(pd);
return 0;
}
static int __maybe_unused pch_dma_resume(struct device *dev)
{
struct pch_dma *pd = dev_get_drvdata(dev);
if (pd)
pch_dma_restore_regs(pd);
return 0;
}
static int pch_dma_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct pch_dma *pd;
struct pch_dma_regs *regs;
unsigned int nr_channels;
int err;
int i;
nr_channels = id->driver_data;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (!pd)
return -ENOMEM;
pci_set_drvdata(pdev, pd);
err = pci_enable_device(pdev);
if (err) {
dev_err(&pdev->dev, "Cannot enable PCI device\n");
goto err_free_mem;
}
if (!(pci_resource_flags(pdev, 1) & IORESOURCE_MEM)) {
dev_err(&pdev->dev, "Cannot find proper base address\n");
err = -ENODEV;
goto err_disable_pdev;
}
err = pci_request_regions(pdev, DRV_NAME);
if (err) {
dev_err(&pdev->dev, "Cannot obtain PCI resources\n");
goto err_disable_pdev;
}
err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
if (err) {
dev_err(&pdev->dev, "Cannot set proper DMA config\n");
goto err_free_res;
}
regs = pd->membase = pci_iomap(pdev, 1, 0);
if (!pd->membase) {
dev_err(&pdev->dev, "Cannot map MMIO registers\n");
err = -ENOMEM;
goto err_free_res;
}
pci_set_master(pdev);
pd->dma.dev = &pdev->dev;
err = request_irq(pdev->irq, pd_irq, IRQF_SHARED, DRV_NAME, pd);
if (err) {
dev_err(&pdev->dev, "Failed to request IRQ\n");
goto err_iounmap;
}
pd->pool = dma_pool_create("pch_dma_desc_pool", &pdev->dev,
sizeof(struct pch_dma_desc), 4, 0);
if (!pd->pool) {
dev_err(&pdev->dev, "Failed to alloc DMA descriptors\n");
err = -ENOMEM;
goto err_free_irq;
}
INIT_LIST_HEAD(&pd->dma.channels);
for (i = 0; i < nr_channels; i++) {
struct pch_dma_chan *pd_chan = &pd->channels[i];
pd_chan->chan.device = &pd->dma;
dma_cookie_init(&pd_chan->chan);
pd_chan->membase = ®s->desc[i];
spin_lock_init(&pd_chan->lock);
INIT_LIST_HEAD(&pd_chan->active_list);
INIT_LIST_HEAD(&pd_chan->queue);
INIT_LIST_HEAD(&pd_chan->free_list);
tasklet_setup(&pd_chan->tasklet, pdc_tasklet);
list_add_tail(&pd_chan->chan.device_node, &pd->dma.channels);
}
dma_cap_zero(pd->dma.cap_mask);
dma_cap_set(DMA_PRIVATE, pd->dma.cap_mask);
dma_cap_set(DMA_SLAVE, pd->dma.cap_mask);
pd->dma.device_alloc_chan_resources = pd_alloc_chan_resources;
pd->dma.device_free_chan_resources = pd_free_chan_resources;
pd->dma.device_tx_status = pd_tx_status;
pd->dma.device_issue_pending = pd_issue_pending;
pd->dma.device_prep_slave_sg = pd_prep_slave_sg;
pd->dma.device_terminate_all = pd_device_terminate_all;
err = dma_async_device_register(&pd->dma);
if (err) {
dev_err(&pdev->dev, "Failed to register DMA device\n");
goto err_free_pool;
}
return 0;
err_free_pool:
dma_pool_destroy(pd->pool);
err_free_irq:
free_irq(pdev->irq, pd);
err_iounmap:
pci_iounmap(pdev, pd->membase);
err_free_res:
pci_release_regions(pdev);
err_disable_pdev:
pci_disable_device(pdev);
err_free_mem:
kfree(pd);
return err;
}
static void pch_dma_remove(struct pci_dev *pdev)
{
struct pch_dma *pd = pci_get_drvdata(pdev);
struct pch_dma_chan *pd_chan;
struct dma_chan *chan, *_c;
if (pd) {
dma_async_device_unregister(&pd->dma);
free_irq(pdev->irq, pd);
list_for_each_entry_safe(chan, _c, &pd->dma.channels,
device_node) {
pd_chan = to_pd_chan(chan);
tasklet_kill(&pd_chan->tasklet);
}
dma_pool_destroy(pd->pool);
pci_iounmap(pdev, pd->membase);
pci_release_regions(pdev);
pci_disable_device(pdev);
kfree(pd);
}
}
/* PCI Device ID of DMA device */
#define PCI_DEVICE_ID_EG20T_PCH_DMA_8CH 0x8810
#define PCI_DEVICE_ID_EG20T_PCH_DMA_4CH 0x8815
#define PCI_DEVICE_ID_ML7213_DMA1_8CH 0x8026
#define PCI_DEVICE_ID_ML7213_DMA2_8CH 0x802B
#define PCI_DEVICE_ID_ML7213_DMA3_4CH 0x8034
#define PCI_DEVICE_ID_ML7213_DMA4_12CH 0x8032
#define PCI_DEVICE_ID_ML7223_DMA1_4CH 0x800B
#define PCI_DEVICE_ID_ML7223_DMA2_4CH 0x800E
#define PCI_DEVICE_ID_ML7223_DMA3_4CH 0x8017
#define PCI_DEVICE_ID_ML7223_DMA4_4CH 0x803B
#define PCI_DEVICE_ID_ML7831_DMA1_8CH 0x8810
#define PCI_DEVICE_ID_ML7831_DMA2_4CH 0x8815
static const struct pci_device_id pch_dma_id_table[] = {
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_8CH), 8 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_4CH), 4 },
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA1_8CH), 8}, /* UART Video */
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA2_8CH), 8}, /* PCMIF SPI */
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA3_4CH), 4}, /* FPGA */
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA4_12CH), 12}, /* I2S */
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA1_4CH), 4}, /* UART */
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA2_4CH), 4}, /* Video SPI */
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA3_4CH), 4}, /* Security */
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA4_4CH), 4}, /* FPGA */
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA1_8CH), 8}, /* UART */
{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA2_4CH), 4}, /* SPI */
{ 0, },
};
static SIMPLE_DEV_PM_OPS(pch_dma_pm_ops, pch_dma_suspend, pch_dma_resume);
static struct pci_driver pch_dma_driver = {
.name = DRV_NAME,
.id_table = pch_dma_id_table,
.probe = pch_dma_probe,
.remove = pch_dma_remove,
.driver.pm = &pch_dma_pm_ops,
};
module_pci_driver(pch_dma_driver);
MODULE_DESCRIPTION("Intel EG20T PCH / LAPIS Semicon ML7213/ML7223/ML7831 IOH "
"DMA controller driver");
MODULE_AUTHOR("Yong Wang <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(pci, pch_dma_id_table);
| linux-master | drivers/dma/pch_dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for STM32 DMA controller
*
* Inspired by dma-jz4740.c and tegra20-apb-dma.c
*
* Copyright (C) M'boumba Cedric Madianga 2015
* Author: M'boumba Cedric Madianga <[email protected]>
* Pierre-Yves Mordret <[email protected]>
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/jiffies.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include "virt-dma.h"
#define STM32_DMA_LISR 0x0000 /* DMA Low Int Status Reg */
#define STM32_DMA_HISR 0x0004 /* DMA High Int Status Reg */
#define STM32_DMA_ISR(n) (((n) & 4) ? STM32_DMA_HISR : STM32_DMA_LISR)
#define STM32_DMA_LIFCR 0x0008 /* DMA Low Int Flag Clear Reg */
#define STM32_DMA_HIFCR 0x000c /* DMA High Int Flag Clear Reg */
#define STM32_DMA_IFCR(n) (((n) & 4) ? STM32_DMA_HIFCR : STM32_DMA_LIFCR)
#define STM32_DMA_TCI BIT(5) /* Transfer Complete Interrupt */
#define STM32_DMA_HTI BIT(4) /* Half Transfer Interrupt */
#define STM32_DMA_TEI BIT(3) /* Transfer Error Interrupt */
#define STM32_DMA_DMEI BIT(2) /* Direct Mode Error Interrupt */
#define STM32_DMA_FEI BIT(0) /* FIFO Error Interrupt */
#define STM32_DMA_MASKI (STM32_DMA_TCI \
| STM32_DMA_TEI \
| STM32_DMA_DMEI \
| STM32_DMA_FEI)
/*
* If (chan->id % 4) is 2 or 3, left shift the mask by 16 bits;
* if (ch % 4) is 1 or 3, additionally left shift the mask by 6 bits.
*/
#define STM32_DMA_FLAGS_SHIFT(n) ({ typeof(n) (_n) = (n); \
(((_n) & 2) << 3) | (((_n) & 1) * 6); })
/* DMA Stream x Configuration Register */
#define STM32_DMA_SCR(x) (0x0010 + 0x18 * (x)) /* x = 0..7 */
#define STM32_DMA_SCR_REQ_MASK GENMASK(27, 25)
#define STM32_DMA_SCR_MBURST_MASK GENMASK(24, 23)
#define STM32_DMA_SCR_PBURST_MASK GENMASK(22, 21)
#define STM32_DMA_SCR_PL_MASK GENMASK(17, 16)
#define STM32_DMA_SCR_MSIZE_MASK GENMASK(14, 13)
#define STM32_DMA_SCR_PSIZE_MASK GENMASK(12, 11)
#define STM32_DMA_SCR_DIR_MASK GENMASK(7, 6)
#define STM32_DMA_SCR_TRBUFF BIT(20) /* Bufferable transfer for USART/UART */
#define STM32_DMA_SCR_CT BIT(19) /* Target in double buffer */
#define STM32_DMA_SCR_DBM BIT(18) /* Double Buffer Mode */
#define STM32_DMA_SCR_PINCOS BIT(15) /* Peripheral inc offset size */
#define STM32_DMA_SCR_MINC BIT(10) /* Memory increment mode */
#define STM32_DMA_SCR_PINC BIT(9) /* Peripheral increment mode */
#define STM32_DMA_SCR_CIRC BIT(8) /* Circular mode */
#define STM32_DMA_SCR_PFCTRL BIT(5) /* Peripheral Flow Controller */
#define STM32_DMA_SCR_TCIE BIT(4) /* Transfer Complete Int Enable
*/
#define STM32_DMA_SCR_TEIE BIT(2) /* Transfer Error Int Enable */
#define STM32_DMA_SCR_DMEIE BIT(1) /* Direct Mode Err Int Enable */
#define STM32_DMA_SCR_EN BIT(0) /* Stream Enable */
#define STM32_DMA_SCR_CFG_MASK (STM32_DMA_SCR_PINC \
| STM32_DMA_SCR_MINC \
| STM32_DMA_SCR_PINCOS \
| STM32_DMA_SCR_PL_MASK)
#define STM32_DMA_SCR_IRQ_MASK (STM32_DMA_SCR_TCIE \
| STM32_DMA_SCR_TEIE \
| STM32_DMA_SCR_DMEIE)
/* DMA Stream x number of data register */
#define STM32_DMA_SNDTR(x) (0x0014 + 0x18 * (x))
/* DMA stream peripheral address register */
#define STM32_DMA_SPAR(x) (0x0018 + 0x18 * (x))
/* DMA stream x memory 0 address register */
#define STM32_DMA_SM0AR(x) (0x001c + 0x18 * (x))
/* DMA stream x memory 1 address register */
#define STM32_DMA_SM1AR(x) (0x0020 + 0x18 * (x))
/* DMA stream x FIFO control register */
#define STM32_DMA_SFCR(x) (0x0024 + 0x18 * (x))
#define STM32_DMA_SFCR_FTH_MASK GENMASK(1, 0)
#define STM32_DMA_SFCR_FEIE BIT(7) /* FIFO error interrupt enable */
#define STM32_DMA_SFCR_DMDIS BIT(2) /* Direct mode disable */
#define STM32_DMA_SFCR_MASK (STM32_DMA_SFCR_FEIE \
| STM32_DMA_SFCR_DMDIS)
/* DMA direction */
#define STM32_DMA_DEV_TO_MEM 0x00
#define STM32_DMA_MEM_TO_DEV 0x01
#define STM32_DMA_MEM_TO_MEM 0x02
/* DMA priority level */
#define STM32_DMA_PRIORITY_LOW 0x00
#define STM32_DMA_PRIORITY_MEDIUM 0x01
#define STM32_DMA_PRIORITY_HIGH 0x02
#define STM32_DMA_PRIORITY_VERY_HIGH 0x03
/* DMA FIFO threshold selection */
#define STM32_DMA_FIFO_THRESHOLD_1QUARTERFULL 0x00
#define STM32_DMA_FIFO_THRESHOLD_HALFFULL 0x01
#define STM32_DMA_FIFO_THRESHOLD_3QUARTERSFULL 0x02
#define STM32_DMA_FIFO_THRESHOLD_FULL 0x03
#define STM32_DMA_FIFO_THRESHOLD_NONE 0x04
#define STM32_DMA_MAX_DATA_ITEMS 0xffff
/*
* Valid transfer starts from @0 to @0xFFFE leading to unaligned scatter
* gather at boundary. Thus it's safer to round down this value on FIFO
* size (16 Bytes)
*/
#define STM32_DMA_ALIGNED_MAX_DATA_ITEMS \
ALIGN_DOWN(STM32_DMA_MAX_DATA_ITEMS, 16)
#define STM32_DMA_MAX_CHANNELS 0x08
#define STM32_DMA_MAX_REQUEST_ID 0x08
#define STM32_DMA_MAX_DATA_PARAM 0x03
#define STM32_DMA_FIFO_SIZE 16 /* FIFO is 16 bytes */
#define STM32_DMA_MIN_BURST 4
#define STM32_DMA_MAX_BURST 16
/* DMA Features */
#define STM32_DMA_THRESHOLD_FTR_MASK GENMASK(1, 0)
#define STM32_DMA_DIRECT_MODE_MASK BIT(2)
#define STM32_DMA_ALT_ACK_MODE_MASK BIT(4)
#define STM32_DMA_MDMA_STREAM_ID_MASK GENMASK(19, 16)
enum stm32_dma_width {
STM32_DMA_BYTE,
STM32_DMA_HALF_WORD,
STM32_DMA_WORD,
};
enum stm32_dma_burst_size {
STM32_DMA_BURST_SINGLE,
STM32_DMA_BURST_INCR4,
STM32_DMA_BURST_INCR8,
STM32_DMA_BURST_INCR16,
};
/**
* struct stm32_dma_cfg - STM32 DMA custom configuration
* @channel_id: channel ID
* @request_line: DMA request
* @stream_config: 32bit mask specifying the DMA channel configuration
* @features: 32bit mask specifying the DMA Feature list
*/
struct stm32_dma_cfg {
u32 channel_id;
u32 request_line;
u32 stream_config;
u32 features;
};
struct stm32_dma_chan_reg {
u32 dma_lisr;
u32 dma_hisr;
u32 dma_lifcr;
u32 dma_hifcr;
u32 dma_scr;
u32 dma_sndtr;
u32 dma_spar;
u32 dma_sm0ar;
u32 dma_sm1ar;
u32 dma_sfcr;
};
struct stm32_dma_sg_req {
u32 len;
struct stm32_dma_chan_reg chan_reg;
};
struct stm32_dma_desc {
struct virt_dma_desc vdesc;
bool cyclic;
u32 num_sgs;
struct stm32_dma_sg_req sg_req[];
};
/**
* struct stm32_dma_mdma_config - STM32 DMA MDMA configuration
* @stream_id: DMA request to trigger STM32 MDMA transfer
* @ifcr: DMA interrupt flag clear register address,
* used by STM32 MDMA to clear DMA Transfer Complete flag
* @tcf: DMA Transfer Complete flag
*/
struct stm32_dma_mdma_config {
u32 stream_id;
u32 ifcr;
u32 tcf;
};
struct stm32_dma_chan {
struct virt_dma_chan vchan;
bool config_init;
bool busy;
u32 id;
u32 irq;
struct stm32_dma_desc *desc;
u32 next_sg;
struct dma_slave_config dma_sconfig;
struct stm32_dma_chan_reg chan_reg;
u32 threshold;
u32 mem_burst;
u32 mem_width;
enum dma_status status;
bool trig_mdma;
struct stm32_dma_mdma_config mdma_config;
};
struct stm32_dma_device {
struct dma_device ddev;
void __iomem *base;
struct clk *clk;
bool mem2mem;
struct stm32_dma_chan chan[STM32_DMA_MAX_CHANNELS];
};
static struct stm32_dma_device *stm32_dma_get_dev(struct stm32_dma_chan *chan)
{
return container_of(chan->vchan.chan.device, struct stm32_dma_device,
ddev);
}
static struct stm32_dma_chan *to_stm32_dma_chan(struct dma_chan *c)
{
return container_of(c, struct stm32_dma_chan, vchan.chan);
}
static struct stm32_dma_desc *to_stm32_dma_desc(struct virt_dma_desc *vdesc)
{
return container_of(vdesc, struct stm32_dma_desc, vdesc);
}
static struct device *chan2dev(struct stm32_dma_chan *chan)
{
return &chan->vchan.chan.dev->device;
}
static u32 stm32_dma_read(struct stm32_dma_device *dmadev, u32 reg)
{
return readl_relaxed(dmadev->base + reg);
}
static void stm32_dma_write(struct stm32_dma_device *dmadev, u32 reg, u32 val)
{
writel_relaxed(val, dmadev->base + reg);
}
static int stm32_dma_get_width(struct stm32_dma_chan *chan,
enum dma_slave_buswidth width)
{
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
return STM32_DMA_BYTE;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
return STM32_DMA_HALF_WORD;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
return STM32_DMA_WORD;
default:
dev_err(chan2dev(chan), "Dma bus width not supported\n");
return -EINVAL;
}
}
static enum dma_slave_buswidth stm32_dma_get_max_width(u32 buf_len,
dma_addr_t buf_addr,
u32 threshold)
{
enum dma_slave_buswidth max_width;
if (threshold == STM32_DMA_FIFO_THRESHOLD_FULL)
max_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
else
max_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
while ((buf_len < max_width || buf_len % max_width) &&
max_width > DMA_SLAVE_BUSWIDTH_1_BYTE)
max_width = max_width >> 1;
if (buf_addr & (max_width - 1))
max_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
return max_width;
}
static bool stm32_dma_fifo_threshold_is_allowed(u32 burst, u32 threshold,
enum dma_slave_buswidth width)
{
u32 remaining;
if (threshold == STM32_DMA_FIFO_THRESHOLD_NONE)
return false;
if (width != DMA_SLAVE_BUSWIDTH_UNDEFINED) {
if (burst != 0) {
/*
* If number of beats fit in several whole bursts
* this configuration is allowed.
*/
remaining = ((STM32_DMA_FIFO_SIZE / width) *
(threshold + 1) / 4) % burst;
if (remaining == 0)
return true;
} else {
return true;
}
}
return false;
}
static bool stm32_dma_is_burst_possible(u32 buf_len, u32 threshold)
{
/* If FIFO direct mode, burst is not possible */
if (threshold == STM32_DMA_FIFO_THRESHOLD_NONE)
return false;
/*
* Buffer or period length has to be aligned on FIFO depth.
* Otherwise bytes may be stuck within FIFO at buffer or period
* length.
*/
return ((buf_len % ((threshold + 1) * 4)) == 0);
}
static u32 stm32_dma_get_best_burst(u32 buf_len, u32 max_burst, u32 threshold,
enum dma_slave_buswidth width)
{
u32 best_burst = max_burst;
if (best_burst == 1 || !stm32_dma_is_burst_possible(buf_len, threshold))
return 0;
while ((buf_len < best_burst * width && best_burst > 1) ||
!stm32_dma_fifo_threshold_is_allowed(best_burst, threshold,
width)) {
if (best_burst > STM32_DMA_MIN_BURST)
best_burst = best_burst >> 1;
else
best_burst = 0;
}
return best_burst;
}
static int stm32_dma_get_burst(struct stm32_dma_chan *chan, u32 maxburst)
{
switch (maxburst) {
case 0:
case 1:
return STM32_DMA_BURST_SINGLE;
case 4:
return STM32_DMA_BURST_INCR4;
case 8:
return STM32_DMA_BURST_INCR8;
case 16:
return STM32_DMA_BURST_INCR16;
default:
dev_err(chan2dev(chan), "Dma burst size not supported\n");
return -EINVAL;
}
}
static void stm32_dma_set_fifo_config(struct stm32_dma_chan *chan,
u32 src_burst, u32 dst_burst)
{
chan->chan_reg.dma_sfcr &= ~STM32_DMA_SFCR_MASK;
chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_DMEIE;
if (!src_burst && !dst_burst) {
/* Using direct mode */
chan->chan_reg.dma_scr |= STM32_DMA_SCR_DMEIE;
} else {
/* Using FIFO mode */
chan->chan_reg.dma_sfcr |= STM32_DMA_SFCR_MASK;
}
}
static int stm32_dma_slave_config(struct dma_chan *c,
struct dma_slave_config *config)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
memcpy(&chan->dma_sconfig, config, sizeof(*config));
/* Check if user is requesting DMA to trigger STM32 MDMA */
if (config->peripheral_size) {
config->peripheral_config = &chan->mdma_config;
config->peripheral_size = sizeof(chan->mdma_config);
chan->trig_mdma = true;
}
chan->config_init = true;
return 0;
}
static u32 stm32_dma_irq_status(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
u32 flags, dma_isr;
/*
* Read "flags" from DMA_xISR register corresponding to the selected
* DMA channel at the correct bit offset inside that register.
*/
dma_isr = stm32_dma_read(dmadev, STM32_DMA_ISR(chan->id));
flags = dma_isr >> STM32_DMA_FLAGS_SHIFT(chan->id);
return flags & STM32_DMA_MASKI;
}
static void stm32_dma_irq_clear(struct stm32_dma_chan *chan, u32 flags)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
u32 dma_ifcr;
/*
* Write "flags" to the DMA_xIFCR register corresponding to the selected
* DMA channel at the correct bit offset inside that register.
*/
flags &= STM32_DMA_MASKI;
dma_ifcr = flags << STM32_DMA_FLAGS_SHIFT(chan->id);
stm32_dma_write(dmadev, STM32_DMA_IFCR(chan->id), dma_ifcr);
}
static int stm32_dma_disable_chan(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
u32 dma_scr, id, reg;
id = chan->id;
reg = STM32_DMA_SCR(id);
dma_scr = stm32_dma_read(dmadev, reg);
if (dma_scr & STM32_DMA_SCR_EN) {
dma_scr &= ~STM32_DMA_SCR_EN;
stm32_dma_write(dmadev, reg, dma_scr);
return readl_relaxed_poll_timeout_atomic(dmadev->base + reg,
dma_scr, !(dma_scr & STM32_DMA_SCR_EN),
10, 1000000);
}
return 0;
}
static void stm32_dma_stop(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
u32 dma_scr, dma_sfcr, status;
int ret;
/* Disable interrupts */
dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
dma_scr &= ~STM32_DMA_SCR_IRQ_MASK;
stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), dma_scr);
dma_sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
dma_sfcr &= ~STM32_DMA_SFCR_FEIE;
stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), dma_sfcr);
/* Disable DMA */
ret = stm32_dma_disable_chan(chan);
if (ret < 0)
return;
/* Clear interrupt status if it is there */
status = stm32_dma_irq_status(chan);
if (status) {
dev_dbg(chan2dev(chan), "%s(): clearing interrupt: 0x%08x\n",
__func__, status);
stm32_dma_irq_clear(chan, status);
}
chan->busy = false;
chan->status = DMA_COMPLETE;
}
static int stm32_dma_terminate_all(struct dma_chan *c)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&chan->vchan.lock, flags);
if (chan->desc) {
dma_cookie_complete(&chan->desc->vdesc.tx);
vchan_terminate_vdesc(&chan->desc->vdesc);
if (chan->busy)
stm32_dma_stop(chan);
chan->desc = NULL;
}
vchan_get_all_descriptors(&chan->vchan, &head);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
vchan_dma_desc_free_list(&chan->vchan, &head);
return 0;
}
static void stm32_dma_synchronize(struct dma_chan *c)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
vchan_synchronize(&chan->vchan);
}
static void stm32_dma_dump_reg(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
u32 scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
u32 ndtr = stm32_dma_read(dmadev, STM32_DMA_SNDTR(chan->id));
u32 spar = stm32_dma_read(dmadev, STM32_DMA_SPAR(chan->id));
u32 sm0ar = stm32_dma_read(dmadev, STM32_DMA_SM0AR(chan->id));
u32 sm1ar = stm32_dma_read(dmadev, STM32_DMA_SM1AR(chan->id));
u32 sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
dev_dbg(chan2dev(chan), "SCR: 0x%08x\n", scr);
dev_dbg(chan2dev(chan), "NDTR: 0x%08x\n", ndtr);
dev_dbg(chan2dev(chan), "SPAR: 0x%08x\n", spar);
dev_dbg(chan2dev(chan), "SM0AR: 0x%08x\n", sm0ar);
dev_dbg(chan2dev(chan), "SM1AR: 0x%08x\n", sm1ar);
dev_dbg(chan2dev(chan), "SFCR: 0x%08x\n", sfcr);
}
static void stm32_dma_sg_inc(struct stm32_dma_chan *chan)
{
chan->next_sg++;
if (chan->desc->cyclic && (chan->next_sg == chan->desc->num_sgs))
chan->next_sg = 0;
}
static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan);
static void stm32_dma_start_transfer(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
struct virt_dma_desc *vdesc;
struct stm32_dma_sg_req *sg_req;
struct stm32_dma_chan_reg *reg;
u32 status;
int ret;
ret = stm32_dma_disable_chan(chan);
if (ret < 0)
return;
if (!chan->desc) {
vdesc = vchan_next_desc(&chan->vchan);
if (!vdesc)
return;
list_del(&vdesc->node);
chan->desc = to_stm32_dma_desc(vdesc);
chan->next_sg = 0;
}
if (chan->next_sg == chan->desc->num_sgs)
chan->next_sg = 0;
sg_req = &chan->desc->sg_req[chan->next_sg];
reg = &sg_req->chan_reg;
/* When DMA triggers STM32 MDMA, DMA Transfer Complete is managed by STM32 MDMA */
if (chan->trig_mdma && chan->dma_sconfig.direction != DMA_MEM_TO_DEV)
reg->dma_scr &= ~STM32_DMA_SCR_TCIE;
reg->dma_scr &= ~STM32_DMA_SCR_EN;
stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr);
stm32_dma_write(dmadev, STM32_DMA_SPAR(chan->id), reg->dma_spar);
stm32_dma_write(dmadev, STM32_DMA_SM0AR(chan->id), reg->dma_sm0ar);
stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), reg->dma_sfcr);
stm32_dma_write(dmadev, STM32_DMA_SM1AR(chan->id), reg->dma_sm1ar);
stm32_dma_write(dmadev, STM32_DMA_SNDTR(chan->id), reg->dma_sndtr);
stm32_dma_sg_inc(chan);
/* Clear interrupt status if it is there */
status = stm32_dma_irq_status(chan);
if (status)
stm32_dma_irq_clear(chan, status);
if (chan->desc->cyclic)
stm32_dma_configure_next_sg(chan);
stm32_dma_dump_reg(chan);
/* Start DMA */
chan->busy = true;
chan->status = DMA_IN_PROGRESS;
reg->dma_scr |= STM32_DMA_SCR_EN;
stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr);
dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan);
}
static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
struct stm32_dma_sg_req *sg_req;
u32 dma_scr, dma_sm0ar, dma_sm1ar, id;
id = chan->id;
dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
sg_req = &chan->desc->sg_req[chan->next_sg];
if (dma_scr & STM32_DMA_SCR_CT) {
dma_sm0ar = sg_req->chan_reg.dma_sm0ar;
stm32_dma_write(dmadev, STM32_DMA_SM0AR(id), dma_sm0ar);
dev_dbg(chan2dev(chan), "CT=1 <=> SM0AR: 0x%08x\n",
stm32_dma_read(dmadev, STM32_DMA_SM0AR(id)));
} else {
dma_sm1ar = sg_req->chan_reg.dma_sm1ar;
stm32_dma_write(dmadev, STM32_DMA_SM1AR(id), dma_sm1ar);
dev_dbg(chan2dev(chan), "CT=0 <=> SM1AR: 0x%08x\n",
stm32_dma_read(dmadev, STM32_DMA_SM1AR(id)));
}
}
static void stm32_dma_handle_chan_paused(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
u32 dma_scr;
/*
* Read and store current remaining data items and peripheral/memory addresses to be
* updated on resume
*/
dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
/*
* Transfer can be paused while between a previous resume and reconfiguration on transfer
* complete. If transfer is cyclic and CIRC and DBM have been deactivated for resume, need
* to set it here in SCR backup to ensure a good reconfiguration on transfer complete.
*/
if (chan->desc && chan->desc->cyclic) {
if (chan->desc->num_sgs == 1)
dma_scr |= STM32_DMA_SCR_CIRC;
else
dma_scr |= STM32_DMA_SCR_DBM;
}
chan->chan_reg.dma_scr = dma_scr;
/*
* Need to temporarily deactivate CIRC/DBM until next Transfer Complete interrupt, otherwise
* on resume NDTR autoreload value will be wrong (lower than the initial period length)
*/
if (chan->desc && chan->desc->cyclic) {
dma_scr &= ~(STM32_DMA_SCR_DBM | STM32_DMA_SCR_CIRC);
stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), dma_scr);
}
chan->chan_reg.dma_sndtr = stm32_dma_read(dmadev, STM32_DMA_SNDTR(chan->id));
chan->status = DMA_PAUSED;
dev_dbg(chan2dev(chan), "vchan %pK: paused\n", &chan->vchan);
}
static void stm32_dma_post_resume_reconfigure(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
struct stm32_dma_sg_req *sg_req;
u32 dma_scr, status, id;
id = chan->id;
dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
/* Clear interrupt status if it is there */
status = stm32_dma_irq_status(chan);
if (status)
stm32_dma_irq_clear(chan, status);
if (!chan->next_sg)
sg_req = &chan->desc->sg_req[chan->desc->num_sgs - 1];
else
sg_req = &chan->desc->sg_req[chan->next_sg - 1];
/* Reconfigure NDTR with the initial value */
stm32_dma_write(dmadev, STM32_DMA_SNDTR(chan->id), sg_req->chan_reg.dma_sndtr);
/* Restore SPAR */
stm32_dma_write(dmadev, STM32_DMA_SPAR(id), sg_req->chan_reg.dma_spar);
/* Restore SM0AR/SM1AR whatever DBM/CT as they may have been modified */
stm32_dma_write(dmadev, STM32_DMA_SM0AR(id), sg_req->chan_reg.dma_sm0ar);
stm32_dma_write(dmadev, STM32_DMA_SM1AR(id), sg_req->chan_reg.dma_sm1ar);
/* Reactivate CIRC/DBM if needed */
if (chan->chan_reg.dma_scr & STM32_DMA_SCR_DBM) {
dma_scr |= STM32_DMA_SCR_DBM;
/* Restore CT */
if (chan->chan_reg.dma_scr & STM32_DMA_SCR_CT)
dma_scr &= ~STM32_DMA_SCR_CT;
else
dma_scr |= STM32_DMA_SCR_CT;
} else if (chan->chan_reg.dma_scr & STM32_DMA_SCR_CIRC) {
dma_scr |= STM32_DMA_SCR_CIRC;
}
stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), dma_scr);
stm32_dma_configure_next_sg(chan);
stm32_dma_dump_reg(chan);
dma_scr |= STM32_DMA_SCR_EN;
stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), dma_scr);
dev_dbg(chan2dev(chan), "vchan %pK: reconfigured after pause/resume\n", &chan->vchan);
}
static void stm32_dma_handle_chan_done(struct stm32_dma_chan *chan, u32 scr)
{
if (!chan->desc)
return;
if (chan->desc->cyclic) {
vchan_cyclic_callback(&chan->desc->vdesc);
if (chan->trig_mdma)
return;
stm32_dma_sg_inc(chan);
/* cyclic while CIRC/DBM disable => post resume reconfiguration needed */
if (!(scr & (STM32_DMA_SCR_CIRC | STM32_DMA_SCR_DBM)))
stm32_dma_post_resume_reconfigure(chan);
else if (scr & STM32_DMA_SCR_DBM)
stm32_dma_configure_next_sg(chan);
} else {
chan->busy = false;
chan->status = DMA_COMPLETE;
if (chan->next_sg == chan->desc->num_sgs) {
vchan_cookie_complete(&chan->desc->vdesc);
chan->desc = NULL;
}
stm32_dma_start_transfer(chan);
}
}
static irqreturn_t stm32_dma_chan_irq(int irq, void *devid)
{
struct stm32_dma_chan *chan = devid;
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
u32 status, scr, sfcr;
spin_lock(&chan->vchan.lock);
status = stm32_dma_irq_status(chan);
scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
if (status & STM32_DMA_FEI) {
stm32_dma_irq_clear(chan, STM32_DMA_FEI);
status &= ~STM32_DMA_FEI;
if (sfcr & STM32_DMA_SFCR_FEIE) {
if (!(scr & STM32_DMA_SCR_EN) &&
!(status & STM32_DMA_TCI))
dev_err(chan2dev(chan), "FIFO Error\n");
else
dev_dbg(chan2dev(chan), "FIFO over/underrun\n");
}
}
if (status & STM32_DMA_DMEI) {
stm32_dma_irq_clear(chan, STM32_DMA_DMEI);
status &= ~STM32_DMA_DMEI;
if (sfcr & STM32_DMA_SCR_DMEIE)
dev_dbg(chan2dev(chan), "Direct mode overrun\n");
}
if (status & STM32_DMA_TCI) {
stm32_dma_irq_clear(chan, STM32_DMA_TCI);
if (scr & STM32_DMA_SCR_TCIE) {
if (chan->status != DMA_PAUSED)
stm32_dma_handle_chan_done(chan, scr);
}
status &= ~STM32_DMA_TCI;
}
if (status & STM32_DMA_HTI) {
stm32_dma_irq_clear(chan, STM32_DMA_HTI);
status &= ~STM32_DMA_HTI;
}
if (status) {
stm32_dma_irq_clear(chan, status);
dev_err(chan2dev(chan), "DMA error: status=0x%08x\n", status);
if (!(scr & STM32_DMA_SCR_EN))
dev_err(chan2dev(chan), "chan disabled by HW\n");
}
spin_unlock(&chan->vchan.lock);
return IRQ_HANDLED;
}
static void stm32_dma_issue_pending(struct dma_chan *c)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
unsigned long flags;
spin_lock_irqsave(&chan->vchan.lock, flags);
if (vchan_issue_pending(&chan->vchan) && !chan->desc && !chan->busy) {
dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan);
stm32_dma_start_transfer(chan);
}
spin_unlock_irqrestore(&chan->vchan.lock, flags);
}
static int stm32_dma_pause(struct dma_chan *c)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
unsigned long flags;
int ret;
if (chan->status != DMA_IN_PROGRESS)
return -EPERM;
spin_lock_irqsave(&chan->vchan.lock, flags);
ret = stm32_dma_disable_chan(chan);
if (!ret)
stm32_dma_handle_chan_paused(chan);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
return ret;
}
static int stm32_dma_resume(struct dma_chan *c)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
struct stm32_dma_chan_reg chan_reg = chan->chan_reg;
u32 id = chan->id, scr, ndtr, offset, spar, sm0ar, sm1ar;
struct stm32_dma_sg_req *sg_req;
unsigned long flags;
if (chan->status != DMA_PAUSED)
return -EPERM;
scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
if (WARN_ON(scr & STM32_DMA_SCR_EN))
return -EPERM;
spin_lock_irqsave(&chan->vchan.lock, flags);
/* sg_reg[prev_sg] contains original ndtr, sm0ar and sm1ar before pausing the transfer */
if (!chan->next_sg)
sg_req = &chan->desc->sg_req[chan->desc->num_sgs - 1];
else
sg_req = &chan->desc->sg_req[chan->next_sg - 1];
ndtr = sg_req->chan_reg.dma_sndtr;
offset = (ndtr - chan_reg.dma_sndtr);
offset <<= FIELD_GET(STM32_DMA_SCR_PSIZE_MASK, chan_reg.dma_scr);
spar = sg_req->chan_reg.dma_spar;
sm0ar = sg_req->chan_reg.dma_sm0ar;
sm1ar = sg_req->chan_reg.dma_sm1ar;
/*
* The peripheral and/or memory addresses have to be updated in order to adjust the
* address pointers. Need to check increment.
*/
if (chan_reg.dma_scr & STM32_DMA_SCR_PINC)
stm32_dma_write(dmadev, STM32_DMA_SPAR(id), spar + offset);
else
stm32_dma_write(dmadev, STM32_DMA_SPAR(id), spar);
if (!(chan_reg.dma_scr & STM32_DMA_SCR_MINC))
offset = 0;
/*
* In case of DBM, the current target could be SM1AR.
* Need to temporarily deactivate CIRC/DBM to finish the current transfer, so
* SM0AR becomes the current target and must be updated with SM1AR + offset if CT=1.
*/
if ((chan_reg.dma_scr & STM32_DMA_SCR_DBM) && (chan_reg.dma_scr & STM32_DMA_SCR_CT))
stm32_dma_write(dmadev, STM32_DMA_SM1AR(id), sm1ar + offset);
else
stm32_dma_write(dmadev, STM32_DMA_SM0AR(id), sm0ar + offset);
/* NDTR must be restored otherwise internal HW counter won't be correctly reset */
stm32_dma_write(dmadev, STM32_DMA_SNDTR(id), chan_reg.dma_sndtr);
/*
* Need to temporarily deactivate CIRC/DBM until next Transfer Complete interrupt,
* otherwise NDTR autoreload value will be wrong (lower than the initial period length)
*/
if (chan_reg.dma_scr & (STM32_DMA_SCR_CIRC | STM32_DMA_SCR_DBM))
chan_reg.dma_scr &= ~(STM32_DMA_SCR_CIRC | STM32_DMA_SCR_DBM);
if (chan_reg.dma_scr & STM32_DMA_SCR_DBM)
stm32_dma_configure_next_sg(chan);
stm32_dma_dump_reg(chan);
/* The stream may then be re-enabled to restart transfer from the point it was stopped */
chan->status = DMA_IN_PROGRESS;
chan_reg.dma_scr |= STM32_DMA_SCR_EN;
stm32_dma_write(dmadev, STM32_DMA_SCR(id), chan_reg.dma_scr);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
dev_dbg(chan2dev(chan), "vchan %pK: resumed\n", &chan->vchan);
return 0;
}
static int stm32_dma_set_xfer_param(struct stm32_dma_chan *chan,
enum dma_transfer_direction direction,
enum dma_slave_buswidth *buswidth,
u32 buf_len, dma_addr_t buf_addr)
{
enum dma_slave_buswidth src_addr_width, dst_addr_width;
int src_bus_width, dst_bus_width;
int src_burst_size, dst_burst_size;
u32 src_maxburst, dst_maxburst, src_best_burst, dst_best_burst;
u32 dma_scr, fifoth;
src_addr_width = chan->dma_sconfig.src_addr_width;
dst_addr_width = chan->dma_sconfig.dst_addr_width;
src_maxburst = chan->dma_sconfig.src_maxburst;
dst_maxburst = chan->dma_sconfig.dst_maxburst;
fifoth = chan->threshold;
switch (direction) {
case DMA_MEM_TO_DEV:
/* Set device data size */
dst_bus_width = stm32_dma_get_width(chan, dst_addr_width);
if (dst_bus_width < 0)
return dst_bus_width;
/* Set device burst size */
dst_best_burst = stm32_dma_get_best_burst(buf_len,
dst_maxburst,
fifoth,
dst_addr_width);
dst_burst_size = stm32_dma_get_burst(chan, dst_best_burst);
if (dst_burst_size < 0)
return dst_burst_size;
/* Set memory data size */
src_addr_width = stm32_dma_get_max_width(buf_len, buf_addr,
fifoth);
chan->mem_width = src_addr_width;
src_bus_width = stm32_dma_get_width(chan, src_addr_width);
if (src_bus_width < 0)
return src_bus_width;
/*
* Set memory burst size - burst not possible if address is not aligned on
* the address boundary equal to the size of the transfer
*/
if (buf_addr & (buf_len - 1))
src_maxburst = 1;
else
src_maxburst = STM32_DMA_MAX_BURST;
src_best_burst = stm32_dma_get_best_burst(buf_len,
src_maxburst,
fifoth,
src_addr_width);
src_burst_size = stm32_dma_get_burst(chan, src_best_burst);
if (src_burst_size < 0)
return src_burst_size;
dma_scr = FIELD_PREP(STM32_DMA_SCR_DIR_MASK, STM32_DMA_MEM_TO_DEV) |
FIELD_PREP(STM32_DMA_SCR_PSIZE_MASK, dst_bus_width) |
FIELD_PREP(STM32_DMA_SCR_MSIZE_MASK, src_bus_width) |
FIELD_PREP(STM32_DMA_SCR_PBURST_MASK, dst_burst_size) |
FIELD_PREP(STM32_DMA_SCR_MBURST_MASK, src_burst_size);
/* Set FIFO threshold */
chan->chan_reg.dma_sfcr &= ~STM32_DMA_SFCR_FTH_MASK;
if (fifoth != STM32_DMA_FIFO_THRESHOLD_NONE)
chan->chan_reg.dma_sfcr |= FIELD_PREP(STM32_DMA_SFCR_FTH_MASK, fifoth);
/* Set peripheral address */
chan->chan_reg.dma_spar = chan->dma_sconfig.dst_addr;
*buswidth = dst_addr_width;
break;
case DMA_DEV_TO_MEM:
/* Set device data size */
src_bus_width = stm32_dma_get_width(chan, src_addr_width);
if (src_bus_width < 0)
return src_bus_width;
/* Set device burst size */
src_best_burst = stm32_dma_get_best_burst(buf_len,
src_maxburst,
fifoth,
src_addr_width);
chan->mem_burst = src_best_burst;
src_burst_size = stm32_dma_get_burst(chan, src_best_burst);
if (src_burst_size < 0)
return src_burst_size;
/* Set memory data size */
dst_addr_width = stm32_dma_get_max_width(buf_len, buf_addr,
fifoth);
chan->mem_width = dst_addr_width;
dst_bus_width = stm32_dma_get_width(chan, dst_addr_width);
if (dst_bus_width < 0)
return dst_bus_width;
/*
* Set memory burst size - burst not possible if address is not aligned on
* the address boundary equal to the size of the transfer
*/
if (buf_addr & (buf_len - 1))
dst_maxburst = 1;
else
dst_maxburst = STM32_DMA_MAX_BURST;
dst_best_burst = stm32_dma_get_best_burst(buf_len,
dst_maxburst,
fifoth,
dst_addr_width);
chan->mem_burst = dst_best_burst;
dst_burst_size = stm32_dma_get_burst(chan, dst_best_burst);
if (dst_burst_size < 0)
return dst_burst_size;
dma_scr = FIELD_PREP(STM32_DMA_SCR_DIR_MASK, STM32_DMA_DEV_TO_MEM) |
FIELD_PREP(STM32_DMA_SCR_PSIZE_MASK, src_bus_width) |
FIELD_PREP(STM32_DMA_SCR_MSIZE_MASK, dst_bus_width) |
FIELD_PREP(STM32_DMA_SCR_PBURST_MASK, src_burst_size) |
FIELD_PREP(STM32_DMA_SCR_MBURST_MASK, dst_burst_size);
/* Set FIFO threshold */
chan->chan_reg.dma_sfcr &= ~STM32_DMA_SFCR_FTH_MASK;
if (fifoth != STM32_DMA_FIFO_THRESHOLD_NONE)
chan->chan_reg.dma_sfcr |= FIELD_PREP(STM32_DMA_SFCR_FTH_MASK, fifoth);
/* Set peripheral address */
chan->chan_reg.dma_spar = chan->dma_sconfig.src_addr;
*buswidth = chan->dma_sconfig.src_addr_width;
break;
default:
dev_err(chan2dev(chan), "Dma direction is not supported\n");
return -EINVAL;
}
stm32_dma_set_fifo_config(chan, src_best_burst, dst_best_burst);
/* Set DMA control register */
chan->chan_reg.dma_scr &= ~(STM32_DMA_SCR_DIR_MASK |
STM32_DMA_SCR_PSIZE_MASK | STM32_DMA_SCR_MSIZE_MASK |
STM32_DMA_SCR_PBURST_MASK | STM32_DMA_SCR_MBURST_MASK);
chan->chan_reg.dma_scr |= dma_scr;
return 0;
}
static void stm32_dma_clear_reg(struct stm32_dma_chan_reg *regs)
{
memset(regs, 0, sizeof(struct stm32_dma_chan_reg));
}
static struct dma_async_tx_descriptor *stm32_dma_prep_slave_sg(
struct dma_chan *c, struct scatterlist *sgl,
u32 sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
struct stm32_dma_desc *desc;
struct scatterlist *sg;
enum dma_slave_buswidth buswidth;
u32 nb_data_items;
int i, ret;
if (!chan->config_init) {
dev_err(chan2dev(chan), "dma channel is not configured\n");
return NULL;
}
if (sg_len < 1) {
dev_err(chan2dev(chan), "Invalid segment length %d\n", sg_len);
return NULL;
}
desc = kzalloc(struct_size(desc, sg_req, sg_len), GFP_NOWAIT);
if (!desc)
return NULL;
/* Set peripheral flow controller */
if (chan->dma_sconfig.device_fc)
chan->chan_reg.dma_scr |= STM32_DMA_SCR_PFCTRL;
else
chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL;
/* Activate Double Buffer Mode if DMA triggers STM32 MDMA and more than 1 sg */
if (chan->trig_mdma && sg_len > 1)
chan->chan_reg.dma_scr |= STM32_DMA_SCR_DBM;
for_each_sg(sgl, sg, sg_len, i) {
ret = stm32_dma_set_xfer_param(chan, direction, &buswidth,
sg_dma_len(sg),
sg_dma_address(sg));
if (ret < 0)
goto err;
desc->sg_req[i].len = sg_dma_len(sg);
nb_data_items = desc->sg_req[i].len / buswidth;
if (nb_data_items > STM32_DMA_ALIGNED_MAX_DATA_ITEMS) {
dev_err(chan2dev(chan), "nb items not supported\n");
goto err;
}
stm32_dma_clear_reg(&desc->sg_req[i].chan_reg);
desc->sg_req[i].chan_reg.dma_scr = chan->chan_reg.dma_scr;
desc->sg_req[i].chan_reg.dma_sfcr = chan->chan_reg.dma_sfcr;
desc->sg_req[i].chan_reg.dma_spar = chan->chan_reg.dma_spar;
desc->sg_req[i].chan_reg.dma_sm0ar = sg_dma_address(sg);
desc->sg_req[i].chan_reg.dma_sm1ar = sg_dma_address(sg);
if (chan->trig_mdma)
desc->sg_req[i].chan_reg.dma_sm1ar += sg_dma_len(sg);
desc->sg_req[i].chan_reg.dma_sndtr = nb_data_items;
}
desc->num_sgs = sg_len;
desc->cyclic = false;
return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
err:
kfree(desc);
return NULL;
}
static struct dma_async_tx_descriptor *stm32_dma_prep_dma_cyclic(
struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
struct stm32_dma_desc *desc;
enum dma_slave_buswidth buswidth;
u32 num_periods, nb_data_items;
int i, ret;
if (!buf_len || !period_len) {
dev_err(chan2dev(chan), "Invalid buffer/period len\n");
return NULL;
}
if (!chan->config_init) {
dev_err(chan2dev(chan), "dma channel is not configured\n");
return NULL;
}
if (buf_len % period_len) {
dev_err(chan2dev(chan), "buf_len not multiple of period_len\n");
return NULL;
}
/*
* We allow to take more number of requests till DMA is
* not started. The driver will loop over all requests.
* Once DMA is started then new requests can be queued only after
* terminating the DMA.
*/
if (chan->busy) {
dev_err(chan2dev(chan), "Request not allowed when dma busy\n");
return NULL;
}
ret = stm32_dma_set_xfer_param(chan, direction, &buswidth, period_len,
buf_addr);
if (ret < 0)
return NULL;
nb_data_items = period_len / buswidth;
if (nb_data_items > STM32_DMA_ALIGNED_MAX_DATA_ITEMS) {
dev_err(chan2dev(chan), "number of items not supported\n");
return NULL;
}
/* Enable Circular mode or double buffer mode */
if (buf_len == period_len) {
chan->chan_reg.dma_scr |= STM32_DMA_SCR_CIRC;
} else {
chan->chan_reg.dma_scr |= STM32_DMA_SCR_DBM;
chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_CT;
}
/* Clear periph ctrl if client set it */
chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL;
num_periods = buf_len / period_len;
desc = kzalloc(struct_size(desc, sg_req, num_periods), GFP_NOWAIT);
if (!desc)
return NULL;
for (i = 0; i < num_periods; i++) {
desc->sg_req[i].len = period_len;
stm32_dma_clear_reg(&desc->sg_req[i].chan_reg);
desc->sg_req[i].chan_reg.dma_scr = chan->chan_reg.dma_scr;
desc->sg_req[i].chan_reg.dma_sfcr = chan->chan_reg.dma_sfcr;
desc->sg_req[i].chan_reg.dma_spar = chan->chan_reg.dma_spar;
desc->sg_req[i].chan_reg.dma_sm0ar = buf_addr;
desc->sg_req[i].chan_reg.dma_sm1ar = buf_addr;
if (chan->trig_mdma)
desc->sg_req[i].chan_reg.dma_sm1ar += period_len;
desc->sg_req[i].chan_reg.dma_sndtr = nb_data_items;
if (!chan->trig_mdma)
buf_addr += period_len;
}
desc->num_sgs = num_periods;
desc->cyclic = true;
return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
}
static struct dma_async_tx_descriptor *stm32_dma_prep_dma_memcpy(
struct dma_chan *c, dma_addr_t dest,
dma_addr_t src, size_t len, unsigned long flags)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
enum dma_slave_buswidth max_width;
struct stm32_dma_desc *desc;
size_t xfer_count, offset;
u32 num_sgs, best_burst, dma_burst, threshold;
int i;
num_sgs = DIV_ROUND_UP(len, STM32_DMA_ALIGNED_MAX_DATA_ITEMS);
desc = kzalloc(struct_size(desc, sg_req, num_sgs), GFP_NOWAIT);
if (!desc)
return NULL;
threshold = chan->threshold;
for (offset = 0, i = 0; offset < len; offset += xfer_count, i++) {
xfer_count = min_t(size_t, len - offset,
STM32_DMA_ALIGNED_MAX_DATA_ITEMS);
/* Compute best burst size */
max_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
best_burst = stm32_dma_get_best_burst(len, STM32_DMA_MAX_BURST,
threshold, max_width);
dma_burst = stm32_dma_get_burst(chan, best_burst);
stm32_dma_clear_reg(&desc->sg_req[i].chan_reg);
desc->sg_req[i].chan_reg.dma_scr =
FIELD_PREP(STM32_DMA_SCR_DIR_MASK, STM32_DMA_MEM_TO_MEM) |
FIELD_PREP(STM32_DMA_SCR_PBURST_MASK, dma_burst) |
FIELD_PREP(STM32_DMA_SCR_MBURST_MASK, dma_burst) |
STM32_DMA_SCR_MINC |
STM32_DMA_SCR_PINC |
STM32_DMA_SCR_TCIE |
STM32_DMA_SCR_TEIE;
desc->sg_req[i].chan_reg.dma_sfcr |= STM32_DMA_SFCR_MASK;
desc->sg_req[i].chan_reg.dma_sfcr |= FIELD_PREP(STM32_DMA_SFCR_FTH_MASK, threshold);
desc->sg_req[i].chan_reg.dma_spar = src + offset;
desc->sg_req[i].chan_reg.dma_sm0ar = dest + offset;
desc->sg_req[i].chan_reg.dma_sndtr = xfer_count;
desc->sg_req[i].len = xfer_count;
}
desc->num_sgs = num_sgs;
desc->cyclic = false;
return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
}
static u32 stm32_dma_get_remaining_bytes(struct stm32_dma_chan *chan)
{
u32 dma_scr, width, ndtr;
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
width = FIELD_GET(STM32_DMA_SCR_PSIZE_MASK, dma_scr);
ndtr = stm32_dma_read(dmadev, STM32_DMA_SNDTR(chan->id));
return ndtr << width;
}
/**
* stm32_dma_is_current_sg - check that expected sg_req is currently transferred
* @chan: dma channel
*
* This function called when IRQ are disable, checks that the hardware has not
* switched on the next transfer in double buffer mode. The test is done by
* comparing the next_sg memory address with the hardware related register
* (based on CT bit value).
*
* Returns true if expected current transfer is still running or double
* buffer mode is not activated.
*/
static bool stm32_dma_is_current_sg(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
struct stm32_dma_sg_req *sg_req;
u32 dma_scr, dma_smar, id, period_len;
id = chan->id;
dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
/* In cyclic CIRC but not DBM, CT is not used */
if (!(dma_scr & STM32_DMA_SCR_DBM))
return true;
sg_req = &chan->desc->sg_req[chan->next_sg];
period_len = sg_req->len;
/* DBM - take care of a previous pause/resume not yet post reconfigured */
if (dma_scr & STM32_DMA_SCR_CT) {
dma_smar = stm32_dma_read(dmadev, STM32_DMA_SM0AR(id));
/*
* If transfer has been pause/resumed,
* SM0AR is in the range of [SM0AR:SM0AR+period_len]
*/
return (dma_smar >= sg_req->chan_reg.dma_sm0ar &&
dma_smar < sg_req->chan_reg.dma_sm0ar + period_len);
}
dma_smar = stm32_dma_read(dmadev, STM32_DMA_SM1AR(id));
/*
* If transfer has been pause/resumed,
* SM1AR is in the range of [SM1AR:SM1AR+period_len]
*/
return (dma_smar >= sg_req->chan_reg.dma_sm1ar &&
dma_smar < sg_req->chan_reg.dma_sm1ar + period_len);
}
static size_t stm32_dma_desc_residue(struct stm32_dma_chan *chan,
struct stm32_dma_desc *desc,
u32 next_sg)
{
u32 modulo, burst_size;
u32 residue;
u32 n_sg = next_sg;
struct stm32_dma_sg_req *sg_req = &chan->desc->sg_req[chan->next_sg];
int i;
/*
* Calculate the residue means compute the descriptors
* information:
* - the sg_req currently transferred
* - the Hardware remaining position in this sg (NDTR bits field).
*
* A race condition may occur if DMA is running in cyclic or double
* buffer mode, since the DMA register are automatically reloaded at end
* of period transfer. The hardware may have switched to the next
* transfer (CT bit updated) just before the position (SxNDTR reg) is
* read.
* In this case the SxNDTR reg could (or not) correspond to the new
* transfer position, and not the expected one.
* The strategy implemented in the stm32 driver is to:
* - read the SxNDTR register
* - crosscheck that hardware is still in current transfer.
* In case of switch, we can assume that the DMA is at the beginning of
* the next transfer. So we approximate the residue in consequence, by
* pointing on the beginning of next transfer.
*
* This race condition doesn't apply for none cyclic mode, as double
* buffer is not used. In such situation registers are updated by the
* software.
*/
residue = stm32_dma_get_remaining_bytes(chan);
if (chan->desc->cyclic && !stm32_dma_is_current_sg(chan)) {
n_sg++;
if (n_sg == chan->desc->num_sgs)
n_sg = 0;
residue = sg_req->len;
}
/*
* In cyclic mode, for the last period, residue = remaining bytes
* from NDTR,
* else for all other periods in cyclic mode, and in sg mode,
* residue = remaining bytes from NDTR + remaining
* periods/sg to be transferred
*/
if (!chan->desc->cyclic || n_sg != 0)
for (i = n_sg; i < desc->num_sgs; i++)
residue += desc->sg_req[i].len;
if (!chan->mem_burst)
return residue;
burst_size = chan->mem_burst * chan->mem_width;
modulo = residue % burst_size;
if (modulo)
residue = residue - modulo + burst_size;
return residue;
}
static enum dma_status stm32_dma_tx_status(struct dma_chan *c,
dma_cookie_t cookie,
struct dma_tx_state *state)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
struct virt_dma_desc *vdesc;
enum dma_status status;
unsigned long flags;
u32 residue = 0;
status = dma_cookie_status(c, cookie, state);
if (status == DMA_COMPLETE)
return status;
status = chan->status;
if (!state)
return status;
spin_lock_irqsave(&chan->vchan.lock, flags);
vdesc = vchan_find_desc(&chan->vchan, cookie);
if (chan->desc && cookie == chan->desc->vdesc.tx.cookie)
residue = stm32_dma_desc_residue(chan, chan->desc,
chan->next_sg);
else if (vdesc)
residue = stm32_dma_desc_residue(chan,
to_stm32_dma_desc(vdesc), 0);
dma_set_residue(state, residue);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
return status;
}
static int stm32_dma_alloc_chan_resources(struct dma_chan *c)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
int ret;
chan->config_init = false;
ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
if (ret < 0)
return ret;
ret = stm32_dma_disable_chan(chan);
if (ret < 0)
pm_runtime_put(dmadev->ddev.dev);
return ret;
}
static void stm32_dma_free_chan_resources(struct dma_chan *c)
{
struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
unsigned long flags;
dev_dbg(chan2dev(chan), "Freeing channel %d\n", chan->id);
if (chan->busy) {
spin_lock_irqsave(&chan->vchan.lock, flags);
stm32_dma_stop(chan);
chan->desc = NULL;
spin_unlock_irqrestore(&chan->vchan.lock, flags);
}
pm_runtime_put(dmadev->ddev.dev);
vchan_free_chan_resources(to_virt_chan(c));
stm32_dma_clear_reg(&chan->chan_reg);
chan->threshold = 0;
}
static void stm32_dma_desc_free(struct virt_dma_desc *vdesc)
{
kfree(container_of(vdesc, struct stm32_dma_desc, vdesc));
}
static void stm32_dma_set_config(struct stm32_dma_chan *chan,
struct stm32_dma_cfg *cfg)
{
stm32_dma_clear_reg(&chan->chan_reg);
chan->chan_reg.dma_scr = cfg->stream_config & STM32_DMA_SCR_CFG_MASK;
chan->chan_reg.dma_scr |= FIELD_PREP(STM32_DMA_SCR_REQ_MASK, cfg->request_line);
/* Enable Interrupts */
chan->chan_reg.dma_scr |= STM32_DMA_SCR_TEIE | STM32_DMA_SCR_TCIE;
chan->threshold = FIELD_GET(STM32_DMA_THRESHOLD_FTR_MASK, cfg->features);
if (FIELD_GET(STM32_DMA_DIRECT_MODE_MASK, cfg->features))
chan->threshold = STM32_DMA_FIFO_THRESHOLD_NONE;
if (FIELD_GET(STM32_DMA_ALT_ACK_MODE_MASK, cfg->features))
chan->chan_reg.dma_scr |= STM32_DMA_SCR_TRBUFF;
chan->mdma_config.stream_id = FIELD_GET(STM32_DMA_MDMA_STREAM_ID_MASK, cfg->features);
}
static struct dma_chan *stm32_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct stm32_dma_device *dmadev = ofdma->of_dma_data;
struct device *dev = dmadev->ddev.dev;
struct stm32_dma_cfg cfg;
struct stm32_dma_chan *chan;
struct dma_chan *c;
if (dma_spec->args_count < 4) {
dev_err(dev, "Bad number of cells\n");
return NULL;
}
cfg.channel_id = dma_spec->args[0];
cfg.request_line = dma_spec->args[1];
cfg.stream_config = dma_spec->args[2];
cfg.features = dma_spec->args[3];
if (cfg.channel_id >= STM32_DMA_MAX_CHANNELS ||
cfg.request_line >= STM32_DMA_MAX_REQUEST_ID) {
dev_err(dev, "Bad channel and/or request id\n");
return NULL;
}
chan = &dmadev->chan[cfg.channel_id];
c = dma_get_slave_channel(&chan->vchan.chan);
if (!c) {
dev_err(dev, "No more channels available\n");
return NULL;
}
stm32_dma_set_config(chan, &cfg);
return c;
}
static const struct of_device_id stm32_dma_of_match[] = {
{ .compatible = "st,stm32-dma", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, stm32_dma_of_match);
static int stm32_dma_probe(struct platform_device *pdev)
{
struct stm32_dma_chan *chan;
struct stm32_dma_device *dmadev;
struct dma_device *dd;
const struct of_device_id *match;
struct resource *res;
struct reset_control *rst;
int i, ret;
match = of_match_device(stm32_dma_of_match, &pdev->dev);
if (!match) {
dev_err(&pdev->dev, "Error: No device match found\n");
return -ENODEV;
}
dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
if (!dmadev)
return -ENOMEM;
dd = &dmadev->ddev;
dmadev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(dmadev->base))
return PTR_ERR(dmadev->base);
dmadev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(dmadev->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(dmadev->clk), "Can't get clock\n");
ret = clk_prepare_enable(dmadev->clk);
if (ret < 0) {
dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret);
return ret;
}
dmadev->mem2mem = of_property_read_bool(pdev->dev.of_node,
"st,mem2mem");
rst = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(rst)) {
ret = PTR_ERR(rst);
if (ret == -EPROBE_DEFER)
goto clk_free;
} else {
reset_control_assert(rst);
udelay(2);
reset_control_deassert(rst);
}
dma_set_max_seg_size(&pdev->dev, STM32_DMA_ALIGNED_MAX_DATA_ITEMS);
dma_cap_set(DMA_SLAVE, dd->cap_mask);
dma_cap_set(DMA_PRIVATE, dd->cap_mask);
dma_cap_set(DMA_CYCLIC, dd->cap_mask);
dd->device_alloc_chan_resources = stm32_dma_alloc_chan_resources;
dd->device_free_chan_resources = stm32_dma_free_chan_resources;
dd->device_tx_status = stm32_dma_tx_status;
dd->device_issue_pending = stm32_dma_issue_pending;
dd->device_prep_slave_sg = stm32_dma_prep_slave_sg;
dd->device_prep_dma_cyclic = stm32_dma_prep_dma_cyclic;
dd->device_config = stm32_dma_slave_config;
dd->device_pause = stm32_dma_pause;
dd->device_resume = stm32_dma_resume;
dd->device_terminate_all = stm32_dma_terminate_all;
dd->device_synchronize = stm32_dma_synchronize;
dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
dd->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
dd->copy_align = DMAENGINE_ALIGN_32_BYTES;
dd->max_burst = STM32_DMA_MAX_BURST;
dd->max_sg_burst = STM32_DMA_ALIGNED_MAX_DATA_ITEMS;
dd->descriptor_reuse = true;
dd->dev = &pdev->dev;
INIT_LIST_HEAD(&dd->channels);
if (dmadev->mem2mem) {
dma_cap_set(DMA_MEMCPY, dd->cap_mask);
dd->device_prep_dma_memcpy = stm32_dma_prep_dma_memcpy;
dd->directions |= BIT(DMA_MEM_TO_MEM);
}
for (i = 0; i < STM32_DMA_MAX_CHANNELS; i++) {
chan = &dmadev->chan[i];
chan->id = i;
chan->vchan.desc_free = stm32_dma_desc_free;
vchan_init(&chan->vchan, dd);
chan->mdma_config.ifcr = res->start;
chan->mdma_config.ifcr += STM32_DMA_IFCR(chan->id);
chan->mdma_config.tcf = STM32_DMA_TCI;
chan->mdma_config.tcf <<= STM32_DMA_FLAGS_SHIFT(chan->id);
}
ret = dma_async_device_register(dd);
if (ret)
goto clk_free;
for (i = 0; i < STM32_DMA_MAX_CHANNELS; i++) {
chan = &dmadev->chan[i];
ret = platform_get_irq(pdev, i);
if (ret < 0)
goto err_unregister;
chan->irq = ret;
ret = devm_request_irq(&pdev->dev, chan->irq,
stm32_dma_chan_irq, 0,
dev_name(chan2dev(chan)), chan);
if (ret) {
dev_err(&pdev->dev,
"request_irq failed with err %d channel %d\n",
ret, i);
goto err_unregister;
}
}
ret = of_dma_controller_register(pdev->dev.of_node,
stm32_dma_of_xlate, dmadev);
if (ret < 0) {
dev_err(&pdev->dev,
"STM32 DMA DMA OF registration failed %d\n", ret);
goto err_unregister;
}
platform_set_drvdata(pdev, dmadev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_put(&pdev->dev);
dev_info(&pdev->dev, "STM32 DMA driver registered\n");
return 0;
err_unregister:
dma_async_device_unregister(dd);
clk_free:
clk_disable_unprepare(dmadev->clk);
return ret;
}
#ifdef CONFIG_PM
static int stm32_dma_runtime_suspend(struct device *dev)
{
struct stm32_dma_device *dmadev = dev_get_drvdata(dev);
clk_disable_unprepare(dmadev->clk);
return 0;
}
static int stm32_dma_runtime_resume(struct device *dev)
{
struct stm32_dma_device *dmadev = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(dmadev->clk);
if (ret) {
dev_err(dev, "failed to prepare_enable clock\n");
return ret;
}
return 0;
}
#endif
#ifdef CONFIG_PM_SLEEP
static int stm32_dma_pm_suspend(struct device *dev)
{
struct stm32_dma_device *dmadev = dev_get_drvdata(dev);
int id, ret, scr;
ret = pm_runtime_resume_and_get(dev);
if (ret < 0)
return ret;
for (id = 0; id < STM32_DMA_MAX_CHANNELS; id++) {
scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id));
if (scr & STM32_DMA_SCR_EN) {
dev_warn(dev, "Suspend is prevented by Chan %i\n", id);
return -EBUSY;
}
}
pm_runtime_put_sync(dev);
pm_runtime_force_suspend(dev);
return 0;
}
static int stm32_dma_pm_resume(struct device *dev)
{
return pm_runtime_force_resume(dev);
}
#endif
static const struct dev_pm_ops stm32_dma_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(stm32_dma_pm_suspend, stm32_dma_pm_resume)
SET_RUNTIME_PM_OPS(stm32_dma_runtime_suspend,
stm32_dma_runtime_resume, NULL)
};
static struct platform_driver stm32_dma_driver = {
.driver = {
.name = "stm32-dma",
.of_match_table = stm32_dma_of_match,
.pm = &stm32_dma_pm_ops,
},
.probe = stm32_dma_probe,
};
static int __init stm32_dma_init(void)
{
return platform_driver_register(&stm32_dma_driver);
}
subsys_initcall(stm32_dma_init);
| linux-master | drivers/dma/stm32-dma.c |
// SPDX-License-Identifier: GPL-2.0+
//
// drivers/dma/imx-sdma.c
//
// This file contains a driver for the Freescale Smart DMA engine
//
// Copyright 2010 Sascha Hauer, Pengutronix <[email protected]>
//
// Based on code from Freescale:
//
// Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/semaphore.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_dma.h>
#include <linux/workqueue.h>
#include <asm/irq.h>
#include <linux/dma/imx-dma.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include "dmaengine.h"
#include "virt-dma.h"
/* SDMA registers */
#define SDMA_H_C0PTR 0x000
#define SDMA_H_INTR 0x004
#define SDMA_H_STATSTOP 0x008
#define SDMA_H_START 0x00c
#define SDMA_H_EVTOVR 0x010
#define SDMA_H_DSPOVR 0x014
#define SDMA_H_HOSTOVR 0x018
#define SDMA_H_EVTPEND 0x01c
#define SDMA_H_DSPENBL 0x020
#define SDMA_H_RESET 0x024
#define SDMA_H_EVTERR 0x028
#define SDMA_H_INTRMSK 0x02c
#define SDMA_H_PSW 0x030
#define SDMA_H_EVTERRDBG 0x034
#define SDMA_H_CONFIG 0x038
#define SDMA_ONCE_ENB 0x040
#define SDMA_ONCE_DATA 0x044
#define SDMA_ONCE_INSTR 0x048
#define SDMA_ONCE_STAT 0x04c
#define SDMA_ONCE_CMD 0x050
#define SDMA_EVT_MIRROR 0x054
#define SDMA_ILLINSTADDR 0x058
#define SDMA_CHN0ADDR 0x05c
#define SDMA_ONCE_RTB 0x060
#define SDMA_XTRIG_CONF1 0x070
#define SDMA_XTRIG_CONF2 0x074
#define SDMA_CHNENBL0_IMX35 0x200
#define SDMA_CHNENBL0_IMX31 0x080
#define SDMA_CHNPRI_0 0x100
#define SDMA_DONE0_CONFIG 0x1000
/*
* Buffer descriptor status values.
*/
#define BD_DONE 0x01
#define BD_WRAP 0x02
#define BD_CONT 0x04
#define BD_INTR 0x08
#define BD_RROR 0x10
#define BD_LAST 0x20
#define BD_EXTD 0x80
/*
* Data Node descriptor status values.
*/
#define DND_END_OF_FRAME 0x80
#define DND_END_OF_XFER 0x40
#define DND_DONE 0x20
#define DND_UNUSED 0x01
/*
* IPCV2 descriptor status values.
*/
#define BD_IPCV2_END_OF_FRAME 0x40
#define IPCV2_MAX_NODES 50
/*
* Error bit set in the CCB status field by the SDMA,
* in setbd routine, in case of a transfer error
*/
#define DATA_ERROR 0x10000000
/*
* Buffer descriptor commands.
*/
#define C0_ADDR 0x01
#define C0_LOAD 0x02
#define C0_DUMP 0x03
#define C0_SETCTX 0x07
#define C0_GETCTX 0x03
#define C0_SETDM 0x01
#define C0_SETPM 0x04
#define C0_GETDM 0x02
#define C0_GETPM 0x08
/*
* Change endianness indicator in the BD command field
*/
#define CHANGE_ENDIANNESS 0x80
/*
* p_2_p watermark_level description
* Bits Name Description
* 0-7 Lower WML Lower watermark level
* 8 PS 1: Pad Swallowing
* 0: No Pad Swallowing
* 9 PA 1: Pad Adding
* 0: No Pad Adding
* 10 SPDIF If this bit is set both source
* and destination are on SPBA
* 11 Source Bit(SP) 1: Source on SPBA
* 0: Source on AIPS
* 12 Destination Bit(DP) 1: Destination on SPBA
* 0: Destination on AIPS
* 13-15 --------- MUST BE 0
* 16-23 Higher WML HWML
* 24-27 N Total number of samples after
* which Pad adding/Swallowing
* must be done. It must be odd.
* 28 Lower WML Event(LWE) SDMA events reg to check for
* LWML event mask
* 0: LWE in EVENTS register
* 1: LWE in EVENTS2 register
* 29 Higher WML Event(HWE) SDMA events reg to check for
* HWML event mask
* 0: HWE in EVENTS register
* 1: HWE in EVENTS2 register
* 30 --------- MUST BE 0
* 31 CONT 1: Amount of samples to be
* transferred is unknown and
* script will keep on
* transferring samples as long as
* both events are detected and
* script must be manually stopped
* by the application
* 0: The amount of samples to be
* transferred is equal to the
* count field of mode word
*/
#define SDMA_WATERMARK_LEVEL_LWML 0xFF
#define SDMA_WATERMARK_LEVEL_PS BIT(8)
#define SDMA_WATERMARK_LEVEL_PA BIT(9)
#define SDMA_WATERMARK_LEVEL_SPDIF BIT(10)
#define SDMA_WATERMARK_LEVEL_SP BIT(11)
#define SDMA_WATERMARK_LEVEL_DP BIT(12)
#define SDMA_WATERMARK_LEVEL_HWML (0xFF << 16)
#define SDMA_WATERMARK_LEVEL_LWE BIT(28)
#define SDMA_WATERMARK_LEVEL_HWE BIT(29)
#define SDMA_WATERMARK_LEVEL_CONT BIT(31)
#define SDMA_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
#define SDMA_DMA_DIRECTIONS (BIT(DMA_DEV_TO_MEM) | \
BIT(DMA_MEM_TO_DEV) | \
BIT(DMA_DEV_TO_DEV))
#define SDMA_WATERMARK_LEVEL_N_FIFOS GENMASK(15, 12)
#define SDMA_WATERMARK_LEVEL_OFF_FIFOS GENMASK(19, 16)
#define SDMA_WATERMARK_LEVEL_WORDS_PER_FIFO GENMASK(31, 28)
#define SDMA_WATERMARK_LEVEL_SW_DONE BIT(23)
#define SDMA_DONE0_CONFIG_DONE_SEL BIT(7)
#define SDMA_DONE0_CONFIG_DONE_DIS BIT(6)
/*
* struct sdma_script_start_addrs - SDMA script start pointers
*
* start addresses of the different functions in the physical
* address space of the SDMA engine.
*/
struct sdma_script_start_addrs {
s32 ap_2_ap_addr;
s32 ap_2_bp_addr;
s32 ap_2_ap_fixed_addr;
s32 bp_2_ap_addr;
s32 loopback_on_dsp_side_addr;
s32 mcu_interrupt_only_addr;
s32 firi_2_per_addr;
s32 firi_2_mcu_addr;
s32 per_2_firi_addr;
s32 mcu_2_firi_addr;
s32 uart_2_per_addr;
s32 uart_2_mcu_addr;
s32 per_2_app_addr;
s32 mcu_2_app_addr;
s32 per_2_per_addr;
s32 uartsh_2_per_addr;
s32 uartsh_2_mcu_addr;
s32 per_2_shp_addr;
s32 mcu_2_shp_addr;
s32 ata_2_mcu_addr;
s32 mcu_2_ata_addr;
s32 app_2_per_addr;
s32 app_2_mcu_addr;
s32 shp_2_per_addr;
s32 shp_2_mcu_addr;
s32 mshc_2_mcu_addr;
s32 mcu_2_mshc_addr;
s32 spdif_2_mcu_addr;
s32 mcu_2_spdif_addr;
s32 asrc_2_mcu_addr;
s32 ext_mem_2_ipu_addr;
s32 descrambler_addr;
s32 dptc_dvfs_addr;
s32 utra_addr;
s32 ram_code_start_addr;
/* End of v1 array */
s32 mcu_2_ssish_addr;
s32 ssish_2_mcu_addr;
s32 hdmi_dma_addr;
/* End of v2 array */
s32 zcanfd_2_mcu_addr;
s32 zqspi_2_mcu_addr;
s32 mcu_2_ecspi_addr;
s32 mcu_2_sai_addr;
s32 sai_2_mcu_addr;
s32 uart_2_mcu_rom_addr;
s32 uartsh_2_mcu_rom_addr;
/* End of v3 array */
s32 mcu_2_zqspi_addr;
/* End of v4 array */
};
/*
* Mode/Count of data node descriptors - IPCv2
*/
struct sdma_mode_count {
#define SDMA_BD_MAX_CNT 0xffff
u32 count : 16; /* size of the buffer pointed by this BD */
u32 status : 8; /* E,R,I,C,W,D status bits stored here */
u32 command : 8; /* command mostly used for channel 0 */
};
/*
* Buffer descriptor
*/
struct sdma_buffer_descriptor {
struct sdma_mode_count mode;
u32 buffer_addr; /* address of the buffer described */
u32 ext_buffer_addr; /* extended buffer address */
} __attribute__ ((packed));
/**
* struct sdma_channel_control - Channel control Block
*
* @current_bd_ptr: current buffer descriptor processed
* @base_bd_ptr: first element of buffer descriptor array
* @unused: padding. The SDMA engine expects an array of 128 byte
* control blocks
*/
struct sdma_channel_control {
u32 current_bd_ptr;
u32 base_bd_ptr;
u32 unused[2];
} __attribute__ ((packed));
/**
* struct sdma_state_registers - SDMA context for a channel
*
* @pc: program counter
* @unused1: unused
* @t: test bit: status of arithmetic & test instruction
* @rpc: return program counter
* @unused0: unused
* @sf: source fault while loading data
* @spc: loop start program counter
* @unused2: unused
* @df: destination fault while storing data
* @epc: loop end program counter
* @lm: loop mode
*/
struct sdma_state_registers {
u32 pc :14;
u32 unused1: 1;
u32 t : 1;
u32 rpc :14;
u32 unused0: 1;
u32 sf : 1;
u32 spc :14;
u32 unused2: 1;
u32 df : 1;
u32 epc :14;
u32 lm : 2;
} __attribute__ ((packed));
/**
* struct sdma_context_data - sdma context specific to a channel
*
* @channel_state: channel state bits
* @gReg: general registers
* @mda: burst dma destination address register
* @msa: burst dma source address register
* @ms: burst dma status register
* @md: burst dma data register
* @pda: peripheral dma destination address register
* @psa: peripheral dma source address register
* @ps: peripheral dma status register
* @pd: peripheral dma data register
* @ca: CRC polynomial register
* @cs: CRC accumulator register
* @dda: dedicated core destination address register
* @dsa: dedicated core source address register
* @ds: dedicated core status register
* @dd: dedicated core data register
* @scratch0: 1st word of dedicated ram for context switch
* @scratch1: 2nd word of dedicated ram for context switch
* @scratch2: 3rd word of dedicated ram for context switch
* @scratch3: 4th word of dedicated ram for context switch
* @scratch4: 5th word of dedicated ram for context switch
* @scratch5: 6th word of dedicated ram for context switch
* @scratch6: 7th word of dedicated ram for context switch
* @scratch7: 8th word of dedicated ram for context switch
*/
struct sdma_context_data {
struct sdma_state_registers channel_state;
u32 gReg[8];
u32 mda;
u32 msa;
u32 ms;
u32 md;
u32 pda;
u32 psa;
u32 ps;
u32 pd;
u32 ca;
u32 cs;
u32 dda;
u32 dsa;
u32 ds;
u32 dd;
u32 scratch0;
u32 scratch1;
u32 scratch2;
u32 scratch3;
u32 scratch4;
u32 scratch5;
u32 scratch6;
u32 scratch7;
} __attribute__ ((packed));
struct sdma_engine;
/**
* struct sdma_desc - descriptor structor for one transfer
* @vd: descriptor for virt dma
* @num_bd: number of descriptors currently handling
* @bd_phys: physical address of bd
* @buf_tail: ID of the buffer that was processed
* @buf_ptail: ID of the previous buffer that was processed
* @period_len: period length, used in cyclic.
* @chn_real_count: the real count updated from bd->mode.count
* @chn_count: the transfer count set
* @sdmac: sdma_channel pointer
* @bd: pointer of allocate bd
*/
struct sdma_desc {
struct virt_dma_desc vd;
unsigned int num_bd;
dma_addr_t bd_phys;
unsigned int buf_tail;
unsigned int buf_ptail;
unsigned int period_len;
unsigned int chn_real_count;
unsigned int chn_count;
struct sdma_channel *sdmac;
struct sdma_buffer_descriptor *bd;
};
/**
* struct sdma_channel - housekeeping for a SDMA channel
*
* @vc: virt_dma base structure
* @desc: sdma description including vd and other special member
* @sdma: pointer to the SDMA engine for this channel
* @channel: the channel number, matches dmaengine chan_id + 1
* @direction: transfer type. Needed for setting SDMA script
* @slave_config: Slave configuration
* @peripheral_type: Peripheral type. Needed for setting SDMA script
* @event_id0: aka dma request line
* @event_id1: for channels that use 2 events
* @word_size: peripheral access size
* @pc_from_device: script address for those device_2_memory
* @pc_to_device: script address for those memory_2_device
* @device_to_device: script address for those device_2_device
* @pc_to_pc: script address for those memory_2_memory
* @flags: loop mode or not
* @per_address: peripheral source or destination address in common case
* destination address in p_2_p case
* @per_address2: peripheral source address in p_2_p case
* @event_mask: event mask used in p_2_p script
* @watermark_level: value for gReg[7], some script will extend it from
* basic watermark such as p_2_p
* @shp_addr: value for gReg[6]
* @per_addr: value for gReg[2]
* @status: status of dma channel
* @context_loaded: ensure context is only loaded once
* @data: specific sdma interface structure
* @bd_pool: dma_pool for bd
* @terminate_worker: used to call back into terminate work function
* @terminated: terminated list
* @is_ram_script: flag for script in ram
* @n_fifos_src: number of source device fifos
* @n_fifos_dst: number of destination device fifos
* @sw_done: software done flag
* @stride_fifos_src: stride for source device FIFOs
* @stride_fifos_dst: stride for destination device FIFOs
* @words_per_fifo: copy number of words one time for one FIFO
*/
struct sdma_channel {
struct virt_dma_chan vc;
struct sdma_desc *desc;
struct sdma_engine *sdma;
unsigned int channel;
enum dma_transfer_direction direction;
struct dma_slave_config slave_config;
enum sdma_peripheral_type peripheral_type;
unsigned int event_id0;
unsigned int event_id1;
enum dma_slave_buswidth word_size;
unsigned int pc_from_device, pc_to_device;
unsigned int device_to_device;
unsigned int pc_to_pc;
unsigned long flags;
dma_addr_t per_address, per_address2;
unsigned long event_mask[2];
unsigned long watermark_level;
u32 shp_addr, per_addr;
enum dma_status status;
struct imx_dma_data data;
struct work_struct terminate_worker;
struct list_head terminated;
bool is_ram_script;
unsigned int n_fifos_src;
unsigned int n_fifos_dst;
unsigned int stride_fifos_src;
unsigned int stride_fifos_dst;
unsigned int words_per_fifo;
bool sw_done;
};
#define IMX_DMA_SG_LOOP BIT(0)
#define MAX_DMA_CHANNELS 32
#define MXC_SDMA_DEFAULT_PRIORITY 1
#define MXC_SDMA_MIN_PRIORITY 1
#define MXC_SDMA_MAX_PRIORITY 7
#define SDMA_FIRMWARE_MAGIC 0x414d4453
/**
* struct sdma_firmware_header - Layout of the firmware image
*
* @magic: "SDMA"
* @version_major: increased whenever layout of struct
* sdma_script_start_addrs changes.
* @version_minor: firmware minor version (for binary compatible changes)
* @script_addrs_start: offset of struct sdma_script_start_addrs in this image
* @num_script_addrs: Number of script addresses in this image
* @ram_code_start: offset of SDMA ram image in this firmware image
* @ram_code_size: size of SDMA ram image
* @script_addrs: Stores the start address of the SDMA scripts
* (in SDMA memory space)
*/
struct sdma_firmware_header {
u32 magic;
u32 version_major;
u32 version_minor;
u32 script_addrs_start;
u32 num_script_addrs;
u32 ram_code_start;
u32 ram_code_size;
};
struct sdma_driver_data {
int chnenbl0;
int num_events;
struct sdma_script_start_addrs *script_addrs;
bool check_ratio;
/*
* ecspi ERR009165 fixed should be done in sdma script
* and it has been fixed in soc from i.mx6ul.
* please get more information from the below link:
* https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf
*/
bool ecspi_fixed;
};
struct sdma_engine {
struct device *dev;
struct sdma_channel channel[MAX_DMA_CHANNELS];
struct sdma_channel_control *channel_control;
void __iomem *regs;
struct sdma_context_data *context;
dma_addr_t context_phys;
struct dma_device dma_device;
struct clk *clk_ipg;
struct clk *clk_ahb;
spinlock_t channel_0_lock;
u32 script_number;
struct sdma_script_start_addrs *script_addrs;
const struct sdma_driver_data *drvdata;
u32 spba_start_addr;
u32 spba_end_addr;
unsigned int irq;
dma_addr_t bd0_phys;
struct sdma_buffer_descriptor *bd0;
/* clock ratio for AHB:SDMA core. 1:1 is 1, 2:1 is 0*/
bool clk_ratio;
bool fw_loaded;
};
static int sdma_config_write(struct dma_chan *chan,
struct dma_slave_config *dmaengine_cfg,
enum dma_transfer_direction direction);
static struct sdma_driver_data sdma_imx31 = {
.chnenbl0 = SDMA_CHNENBL0_IMX31,
.num_events = 32,
};
static struct sdma_script_start_addrs sdma_script_imx25 = {
.ap_2_ap_addr = 729,
.uart_2_mcu_addr = 904,
.per_2_app_addr = 1255,
.mcu_2_app_addr = 834,
.uartsh_2_mcu_addr = 1120,
.per_2_shp_addr = 1329,
.mcu_2_shp_addr = 1048,
.ata_2_mcu_addr = 1560,
.mcu_2_ata_addr = 1479,
.app_2_per_addr = 1189,
.app_2_mcu_addr = 770,
.shp_2_per_addr = 1407,
.shp_2_mcu_addr = 979,
};
static struct sdma_driver_data sdma_imx25 = {
.chnenbl0 = SDMA_CHNENBL0_IMX35,
.num_events = 48,
.script_addrs = &sdma_script_imx25,
};
static struct sdma_driver_data sdma_imx35 = {
.chnenbl0 = SDMA_CHNENBL0_IMX35,
.num_events = 48,
};
static struct sdma_script_start_addrs sdma_script_imx51 = {
.ap_2_ap_addr = 642,
.uart_2_mcu_addr = 817,
.mcu_2_app_addr = 747,
.mcu_2_shp_addr = 961,
.ata_2_mcu_addr = 1473,
.mcu_2_ata_addr = 1392,
.app_2_per_addr = 1033,
.app_2_mcu_addr = 683,
.shp_2_per_addr = 1251,
.shp_2_mcu_addr = 892,
};
static struct sdma_driver_data sdma_imx51 = {
.chnenbl0 = SDMA_CHNENBL0_IMX35,
.num_events = 48,
.script_addrs = &sdma_script_imx51,
};
static struct sdma_script_start_addrs sdma_script_imx53 = {
.ap_2_ap_addr = 642,
.app_2_mcu_addr = 683,
.mcu_2_app_addr = 747,
.uart_2_mcu_addr = 817,
.shp_2_mcu_addr = 891,
.mcu_2_shp_addr = 960,
.uartsh_2_mcu_addr = 1032,
.spdif_2_mcu_addr = 1100,
.mcu_2_spdif_addr = 1134,
.firi_2_mcu_addr = 1193,
.mcu_2_firi_addr = 1290,
};
static struct sdma_driver_data sdma_imx53 = {
.chnenbl0 = SDMA_CHNENBL0_IMX35,
.num_events = 48,
.script_addrs = &sdma_script_imx53,
};
static struct sdma_script_start_addrs sdma_script_imx6q = {
.ap_2_ap_addr = 642,
.uart_2_mcu_addr = 817,
.mcu_2_app_addr = 747,
.per_2_per_addr = 6331,
.uartsh_2_mcu_addr = 1032,
.mcu_2_shp_addr = 960,
.app_2_mcu_addr = 683,
.shp_2_mcu_addr = 891,
.spdif_2_mcu_addr = 1100,
.mcu_2_spdif_addr = 1134,
};
static struct sdma_driver_data sdma_imx6q = {
.chnenbl0 = SDMA_CHNENBL0_IMX35,
.num_events = 48,
.script_addrs = &sdma_script_imx6q,
};
static struct sdma_driver_data sdma_imx6ul = {
.chnenbl0 = SDMA_CHNENBL0_IMX35,
.num_events = 48,
.script_addrs = &sdma_script_imx6q,
.ecspi_fixed = true,
};
static struct sdma_script_start_addrs sdma_script_imx7d = {
.ap_2_ap_addr = 644,
.uart_2_mcu_addr = 819,
.mcu_2_app_addr = 749,
.uartsh_2_mcu_addr = 1034,
.mcu_2_shp_addr = 962,
.app_2_mcu_addr = 685,
.shp_2_mcu_addr = 893,
.spdif_2_mcu_addr = 1102,
.mcu_2_spdif_addr = 1136,
};
static struct sdma_driver_data sdma_imx7d = {
.chnenbl0 = SDMA_CHNENBL0_IMX35,
.num_events = 48,
.script_addrs = &sdma_script_imx7d,
};
static struct sdma_driver_data sdma_imx8mq = {
.chnenbl0 = SDMA_CHNENBL0_IMX35,
.num_events = 48,
.script_addrs = &sdma_script_imx7d,
.check_ratio = 1,
};
static const struct of_device_id sdma_dt_ids[] = {
{ .compatible = "fsl,imx6q-sdma", .data = &sdma_imx6q, },
{ .compatible = "fsl,imx53-sdma", .data = &sdma_imx53, },
{ .compatible = "fsl,imx51-sdma", .data = &sdma_imx51, },
{ .compatible = "fsl,imx35-sdma", .data = &sdma_imx35, },
{ .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, },
{ .compatible = "fsl,imx25-sdma", .data = &sdma_imx25, },
{ .compatible = "fsl,imx7d-sdma", .data = &sdma_imx7d, },
{ .compatible = "fsl,imx6ul-sdma", .data = &sdma_imx6ul, },
{ .compatible = "fsl,imx8mq-sdma", .data = &sdma_imx8mq, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sdma_dt_ids);
#define SDMA_H_CONFIG_DSPDMA BIT(12) /* indicates if the DSPDMA is used */
#define SDMA_H_CONFIG_RTD_PINS BIT(11) /* indicates if Real-Time Debug pins are enabled */
#define SDMA_H_CONFIG_ACR BIT(4) /* indicates if AHB freq /core freq = 2 or 1 */
#define SDMA_H_CONFIG_CSM (3) /* indicates which context switch mode is selected*/
static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event)
{
u32 chnenbl0 = sdma->drvdata->chnenbl0;
return chnenbl0 + event * 4;
}
static int sdma_config_ownership(struct sdma_channel *sdmac,
bool event_override, bool mcu_override, bool dsp_override)
{
struct sdma_engine *sdma = sdmac->sdma;
int channel = sdmac->channel;
unsigned long evt, mcu, dsp;
if (event_override && mcu_override && dsp_override)
return -EINVAL;
evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR);
mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR);
dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR);
if (dsp_override)
__clear_bit(channel, &dsp);
else
__set_bit(channel, &dsp);
if (event_override)
__clear_bit(channel, &evt);
else
__set_bit(channel, &evt);
if (mcu_override)
__clear_bit(channel, &mcu);
else
__set_bit(channel, &mcu);
writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR);
writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR);
writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR);
return 0;
}
static int is_sdma_channel_enabled(struct sdma_engine *sdma, int channel)
{
return !!(readl(sdma->regs + SDMA_H_STATSTOP) & BIT(channel));
}
static void sdma_enable_channel(struct sdma_engine *sdma, int channel)
{
writel(BIT(channel), sdma->regs + SDMA_H_START);
}
/*
* sdma_run_channel0 - run a channel and wait till it's done
*/
static int sdma_run_channel0(struct sdma_engine *sdma)
{
int ret;
u32 reg;
sdma_enable_channel(sdma, 0);
ret = readl_relaxed_poll_timeout_atomic(sdma->regs + SDMA_H_STATSTOP,
reg, !(reg & 1), 1, 500);
if (ret)
dev_err(sdma->dev, "Timeout waiting for CH0 ready\n");
/* Set bits of CONFIG register with dynamic context switching */
reg = readl(sdma->regs + SDMA_H_CONFIG);
if ((reg & SDMA_H_CONFIG_CSM) == 0) {
reg |= SDMA_H_CONFIG_CSM;
writel_relaxed(reg, sdma->regs + SDMA_H_CONFIG);
}
return ret;
}
static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
u32 address)
{
struct sdma_buffer_descriptor *bd0 = sdma->bd0;
void *buf_virt;
dma_addr_t buf_phys;
int ret;
unsigned long flags;
buf_virt = dma_alloc_coherent(sdma->dev, size, &buf_phys, GFP_KERNEL);
if (!buf_virt)
return -ENOMEM;
spin_lock_irqsave(&sdma->channel_0_lock, flags);
bd0->mode.command = C0_SETPM;
bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD;
bd0->mode.count = size / 2;
bd0->buffer_addr = buf_phys;
bd0->ext_buffer_addr = address;
memcpy(buf_virt, buf, size);
ret = sdma_run_channel0(sdma);
spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
dma_free_coherent(sdma->dev, size, buf_virt, buf_phys);
return ret;
}
static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event)
{
struct sdma_engine *sdma = sdmac->sdma;
int channel = sdmac->channel;
unsigned long val;
u32 chnenbl = chnenbl_ofs(sdma, event);
val = readl_relaxed(sdma->regs + chnenbl);
__set_bit(channel, &val);
writel_relaxed(val, sdma->regs + chnenbl);
/* Set SDMA_DONEx_CONFIG is sw_done enabled */
if (sdmac->sw_done) {
val = readl_relaxed(sdma->regs + SDMA_DONE0_CONFIG);
val |= SDMA_DONE0_CONFIG_DONE_SEL;
val &= ~SDMA_DONE0_CONFIG_DONE_DIS;
writel_relaxed(val, sdma->regs + SDMA_DONE0_CONFIG);
}
}
static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event)
{
struct sdma_engine *sdma = sdmac->sdma;
int channel = sdmac->channel;
u32 chnenbl = chnenbl_ofs(sdma, event);
unsigned long val;
val = readl_relaxed(sdma->regs + chnenbl);
__clear_bit(channel, &val);
writel_relaxed(val, sdma->regs + chnenbl);
}
static struct sdma_desc *to_sdma_desc(struct dma_async_tx_descriptor *t)
{
return container_of(t, struct sdma_desc, vd.tx);
}
static void sdma_start_desc(struct sdma_channel *sdmac)
{
struct virt_dma_desc *vd = vchan_next_desc(&sdmac->vc);
struct sdma_desc *desc;
struct sdma_engine *sdma = sdmac->sdma;
int channel = sdmac->channel;
if (!vd) {
sdmac->desc = NULL;
return;
}
sdmac->desc = desc = to_sdma_desc(&vd->tx);
list_del(&vd->node);
sdma->channel_control[channel].base_bd_ptr = desc->bd_phys;
sdma->channel_control[channel].current_bd_ptr = desc->bd_phys;
sdma_enable_channel(sdma, sdmac->channel);
}
static void sdma_update_channel_loop(struct sdma_channel *sdmac)
{
struct sdma_buffer_descriptor *bd;
int error = 0;
enum dma_status old_status = sdmac->status;
/*
* loop mode. Iterate over descriptors, re-setup them and
* call callback function.
*/
while (sdmac->desc) {
struct sdma_desc *desc = sdmac->desc;
bd = &desc->bd[desc->buf_tail];
if (bd->mode.status & BD_DONE)
break;
if (bd->mode.status & BD_RROR) {
bd->mode.status &= ~BD_RROR;
sdmac->status = DMA_ERROR;
error = -EIO;
}
/*
* We use bd->mode.count to calculate the residue, since contains
* the number of bytes present in the current buffer descriptor.
*/
desc->chn_real_count = bd->mode.count;
bd->mode.count = desc->period_len;
desc->buf_ptail = desc->buf_tail;
desc->buf_tail = (desc->buf_tail + 1) % desc->num_bd;
/*
* The callback is called from the interrupt context in order
* to reduce latency and to avoid the risk of altering the
* SDMA transaction status by the time the client tasklet is
* executed.
*/
spin_unlock(&sdmac->vc.lock);
dmaengine_desc_get_callback_invoke(&desc->vd.tx, NULL);
spin_lock(&sdmac->vc.lock);
/* Assign buffer ownership to SDMA */
bd->mode.status |= BD_DONE;
if (error)
sdmac->status = old_status;
}
/*
* SDMA stops cyclic channel when DMA request triggers a channel and no SDMA
* owned buffer is available (i.e. BD_DONE was set too late).
*/
if (sdmac->desc && !is_sdma_channel_enabled(sdmac->sdma, sdmac->channel)) {
dev_warn(sdmac->sdma->dev, "restart cyclic channel %d\n", sdmac->channel);
sdma_enable_channel(sdmac->sdma, sdmac->channel);
}
}
static void mxc_sdma_handle_channel_normal(struct sdma_channel *data)
{
struct sdma_channel *sdmac = (struct sdma_channel *) data;
struct sdma_buffer_descriptor *bd;
int i, error = 0;
sdmac->desc->chn_real_count = 0;
/*
* non loop mode. Iterate over all descriptors, collect
* errors and call callback function
*/
for (i = 0; i < sdmac->desc->num_bd; i++) {
bd = &sdmac->desc->bd[i];
if (bd->mode.status & (BD_DONE | BD_RROR))
error = -EIO;
sdmac->desc->chn_real_count += bd->mode.count;
}
if (error)
sdmac->status = DMA_ERROR;
else
sdmac->status = DMA_COMPLETE;
}
static irqreturn_t sdma_int_handler(int irq, void *dev_id)
{
struct sdma_engine *sdma = dev_id;
unsigned long stat;
stat = readl_relaxed(sdma->regs + SDMA_H_INTR);
writel_relaxed(stat, sdma->regs + SDMA_H_INTR);
/* channel 0 is special and not handled here, see run_channel0() */
stat &= ~1;
while (stat) {
int channel = fls(stat) - 1;
struct sdma_channel *sdmac = &sdma->channel[channel];
struct sdma_desc *desc;
spin_lock(&sdmac->vc.lock);
desc = sdmac->desc;
if (desc) {
if (sdmac->flags & IMX_DMA_SG_LOOP) {
if (sdmac->peripheral_type != IMX_DMATYPE_HDMI)
sdma_update_channel_loop(sdmac);
else
vchan_cyclic_callback(&desc->vd);
} else {
mxc_sdma_handle_channel_normal(sdmac);
vchan_cookie_complete(&desc->vd);
sdma_start_desc(sdmac);
}
}
spin_unlock(&sdmac->vc.lock);
__clear_bit(channel, &stat);
}
return IRQ_HANDLED;
}
/*
* sets the pc of SDMA script according to the peripheral type
*/
static int sdma_get_pc(struct sdma_channel *sdmac,
enum sdma_peripheral_type peripheral_type)
{
struct sdma_engine *sdma = sdmac->sdma;
int per_2_emi = 0, emi_2_per = 0;
/*
* These are needed once we start to support transfers between
* two peripherals or memory-to-memory transfers
*/
int per_2_per = 0, emi_2_emi = 0;
sdmac->pc_from_device = 0;
sdmac->pc_to_device = 0;
sdmac->device_to_device = 0;
sdmac->pc_to_pc = 0;
sdmac->is_ram_script = false;
switch (peripheral_type) {
case IMX_DMATYPE_MEMORY:
emi_2_emi = sdma->script_addrs->ap_2_ap_addr;
break;
case IMX_DMATYPE_DSP:
emi_2_per = sdma->script_addrs->bp_2_ap_addr;
per_2_emi = sdma->script_addrs->ap_2_bp_addr;
break;
case IMX_DMATYPE_FIRI:
per_2_emi = sdma->script_addrs->firi_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_firi_addr;
break;
case IMX_DMATYPE_UART:
per_2_emi = sdma->script_addrs->uart_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_app_addr;
break;
case IMX_DMATYPE_UART_SP:
per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
break;
case IMX_DMATYPE_ATA:
per_2_emi = sdma->script_addrs->ata_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_ata_addr;
break;
case IMX_DMATYPE_CSPI:
per_2_emi = sdma->script_addrs->app_2_mcu_addr;
/* Use rom script mcu_2_app if ERR009165 fixed */
if (sdmac->sdma->drvdata->ecspi_fixed) {
emi_2_per = sdma->script_addrs->mcu_2_app_addr;
} else {
emi_2_per = sdma->script_addrs->mcu_2_ecspi_addr;
sdmac->is_ram_script = true;
}
break;
case IMX_DMATYPE_EXT:
case IMX_DMATYPE_SSI:
case IMX_DMATYPE_SAI:
per_2_emi = sdma->script_addrs->app_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_app_addr;
break;
case IMX_DMATYPE_SSI_DUAL:
per_2_emi = sdma->script_addrs->ssish_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_ssish_addr;
sdmac->is_ram_script = true;
break;
case IMX_DMATYPE_SSI_SP:
case IMX_DMATYPE_MMC:
case IMX_DMATYPE_SDHC:
case IMX_DMATYPE_CSPI_SP:
case IMX_DMATYPE_ESAI:
case IMX_DMATYPE_MSHC_SP:
per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
break;
case IMX_DMATYPE_ASRC:
per_2_emi = sdma->script_addrs->asrc_2_mcu_addr;
emi_2_per = sdma->script_addrs->asrc_2_mcu_addr;
per_2_per = sdma->script_addrs->per_2_per_addr;
sdmac->is_ram_script = true;
break;
case IMX_DMATYPE_ASRC_SP:
per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
per_2_per = sdma->script_addrs->per_2_per_addr;
break;
case IMX_DMATYPE_MSHC:
per_2_emi = sdma->script_addrs->mshc_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_mshc_addr;
break;
case IMX_DMATYPE_CCM:
per_2_emi = sdma->script_addrs->dptc_dvfs_addr;
break;
case IMX_DMATYPE_SPDIF:
per_2_emi = sdma->script_addrs->spdif_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_spdif_addr;
break;
case IMX_DMATYPE_IPU_MEMORY:
emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr;
break;
case IMX_DMATYPE_MULTI_SAI:
per_2_emi = sdma->script_addrs->sai_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_sai_addr;
break;
case IMX_DMATYPE_HDMI:
emi_2_per = sdma->script_addrs->hdmi_dma_addr;
sdmac->is_ram_script = true;
break;
default:
dev_err(sdma->dev, "Unsupported transfer type %d\n",
peripheral_type);
return -EINVAL;
}
sdmac->pc_from_device = per_2_emi;
sdmac->pc_to_device = emi_2_per;
sdmac->device_to_device = per_2_per;
sdmac->pc_to_pc = emi_2_emi;
return 0;
}
static int sdma_load_context(struct sdma_channel *sdmac)
{
struct sdma_engine *sdma = sdmac->sdma;
int channel = sdmac->channel;
int load_address;
struct sdma_context_data *context = sdma->context;
struct sdma_buffer_descriptor *bd0 = sdma->bd0;
int ret;
unsigned long flags;
if (sdmac->direction == DMA_DEV_TO_MEM)
load_address = sdmac->pc_from_device;
else if (sdmac->direction == DMA_DEV_TO_DEV)
load_address = sdmac->device_to_device;
else if (sdmac->direction == DMA_MEM_TO_MEM)
load_address = sdmac->pc_to_pc;
else
load_address = sdmac->pc_to_device;
if (load_address < 0)
return load_address;
dev_dbg(sdma->dev, "load_address = %d\n", load_address);
dev_dbg(sdma->dev, "wml = 0x%08x\n", (u32)sdmac->watermark_level);
dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr);
dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr);
dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]);
dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]);
spin_lock_irqsave(&sdma->channel_0_lock, flags);
memset(context, 0, sizeof(*context));
context->channel_state.pc = load_address;
/* Send by context the event mask,base address for peripheral
* and watermark level
*/
if (sdmac->peripheral_type == IMX_DMATYPE_HDMI) {
context->gReg[4] = sdmac->per_addr;
context->gReg[6] = sdmac->shp_addr;
} else {
context->gReg[0] = sdmac->event_mask[1];
context->gReg[1] = sdmac->event_mask[0];
context->gReg[2] = sdmac->per_addr;
context->gReg[6] = sdmac->shp_addr;
context->gReg[7] = sdmac->watermark_level;
}
bd0->mode.command = C0_SETDM;
bd0->mode.status = BD_DONE | BD_WRAP | BD_EXTD;
bd0->mode.count = sizeof(*context) / 4;
bd0->buffer_addr = sdma->context_phys;
bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel;
ret = sdma_run_channel0(sdma);
spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
return ret;
}
static struct sdma_channel *to_sdma_chan(struct dma_chan *chan)
{
return container_of(chan, struct sdma_channel, vc.chan);
}
static int sdma_disable_channel(struct dma_chan *chan)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct sdma_engine *sdma = sdmac->sdma;
int channel = sdmac->channel;
writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP);
sdmac->status = DMA_ERROR;
return 0;
}
static void sdma_channel_terminate_work(struct work_struct *work)
{
struct sdma_channel *sdmac = container_of(work, struct sdma_channel,
terminate_worker);
/*
* According to NXP R&D team a delay of one BD SDMA cost time
* (maximum is 1ms) should be added after disable of the channel
* bit, to ensure SDMA core has really been stopped after SDMA
* clients call .device_terminate_all.
*/
usleep_range(1000, 2000);
vchan_dma_desc_free_list(&sdmac->vc, &sdmac->terminated);
}
static int sdma_terminate_all(struct dma_chan *chan)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&sdmac->vc.lock, flags);
sdma_disable_channel(chan);
if (sdmac->desc) {
vchan_terminate_vdesc(&sdmac->desc->vd);
/*
* move out current descriptor into terminated list so that
* it could be free in sdma_channel_terminate_work alone
* later without potential involving next descriptor raised
* up before the last descriptor terminated.
*/
vchan_get_all_descriptors(&sdmac->vc, &sdmac->terminated);
sdmac->desc = NULL;
schedule_work(&sdmac->terminate_worker);
}
spin_unlock_irqrestore(&sdmac->vc.lock, flags);
return 0;
}
static void sdma_channel_synchronize(struct dma_chan *chan)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
vchan_synchronize(&sdmac->vc);
flush_work(&sdmac->terminate_worker);
}
static void sdma_set_watermarklevel_for_p2p(struct sdma_channel *sdmac)
{
struct sdma_engine *sdma = sdmac->sdma;
int lwml = sdmac->watermark_level & SDMA_WATERMARK_LEVEL_LWML;
int hwml = (sdmac->watermark_level & SDMA_WATERMARK_LEVEL_HWML) >> 16;
set_bit(sdmac->event_id0 % 32, &sdmac->event_mask[1]);
set_bit(sdmac->event_id1 % 32, &sdmac->event_mask[0]);
if (sdmac->event_id0 > 31)
sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_LWE;
if (sdmac->event_id1 > 31)
sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_HWE;
/*
* If LWML(src_maxburst) > HWML(dst_maxburst), we need
* swap LWML and HWML of INFO(A.3.2.5.1), also need swap
* r0(event_mask[1]) and r1(event_mask[0]).
*/
if (lwml > hwml) {
sdmac->watermark_level &= ~(SDMA_WATERMARK_LEVEL_LWML |
SDMA_WATERMARK_LEVEL_HWML);
sdmac->watermark_level |= hwml;
sdmac->watermark_level |= lwml << 16;
swap(sdmac->event_mask[0], sdmac->event_mask[1]);
}
if (sdmac->per_address2 >= sdma->spba_start_addr &&
sdmac->per_address2 <= sdma->spba_end_addr)
sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_SP;
if (sdmac->per_address >= sdma->spba_start_addr &&
sdmac->per_address <= sdma->spba_end_addr)
sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_DP;
sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_CONT;
}
static void sdma_set_watermarklevel_for_sais(struct sdma_channel *sdmac)
{
unsigned int n_fifos;
unsigned int stride_fifos;
unsigned int words_per_fifo;
if (sdmac->sw_done)
sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_SW_DONE;
if (sdmac->direction == DMA_DEV_TO_MEM) {
n_fifos = sdmac->n_fifos_src;
stride_fifos = sdmac->stride_fifos_src;
} else {
n_fifos = sdmac->n_fifos_dst;
stride_fifos = sdmac->stride_fifos_dst;
}
words_per_fifo = sdmac->words_per_fifo;
sdmac->watermark_level |=
FIELD_PREP(SDMA_WATERMARK_LEVEL_N_FIFOS, n_fifos);
sdmac->watermark_level |=
FIELD_PREP(SDMA_WATERMARK_LEVEL_OFF_FIFOS, stride_fifos);
if (words_per_fifo)
sdmac->watermark_level |=
FIELD_PREP(SDMA_WATERMARK_LEVEL_WORDS_PER_FIFO, (words_per_fifo - 1));
}
static int sdma_config_channel(struct dma_chan *chan)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
int ret;
sdma_disable_channel(chan);
sdmac->event_mask[0] = 0;
sdmac->event_mask[1] = 0;
sdmac->shp_addr = 0;
sdmac->per_addr = 0;
switch (sdmac->peripheral_type) {
case IMX_DMATYPE_DSP:
sdma_config_ownership(sdmac, false, true, true);
break;
case IMX_DMATYPE_MEMORY:
sdma_config_ownership(sdmac, false, true, false);
break;
default:
sdma_config_ownership(sdmac, true, true, false);
break;
}
ret = sdma_get_pc(sdmac, sdmac->peripheral_type);
if (ret)
return ret;
if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) &&
(sdmac->peripheral_type != IMX_DMATYPE_DSP)) {
/* Handle multiple event channels differently */
if (sdmac->event_id1) {
if (sdmac->peripheral_type == IMX_DMATYPE_ASRC_SP ||
sdmac->peripheral_type == IMX_DMATYPE_ASRC)
sdma_set_watermarklevel_for_p2p(sdmac);
} else {
if (sdmac->peripheral_type ==
IMX_DMATYPE_MULTI_SAI)
sdma_set_watermarklevel_for_sais(sdmac);
__set_bit(sdmac->event_id0, sdmac->event_mask);
}
/* Address */
sdmac->shp_addr = sdmac->per_address;
sdmac->per_addr = sdmac->per_address2;
} else {
sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */
}
return 0;
}
static int sdma_set_channel_priority(struct sdma_channel *sdmac,
unsigned int priority)
{
struct sdma_engine *sdma = sdmac->sdma;
int channel = sdmac->channel;
if (priority < MXC_SDMA_MIN_PRIORITY
|| priority > MXC_SDMA_MAX_PRIORITY) {
return -EINVAL;
}
writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel);
return 0;
}
static int sdma_request_channel0(struct sdma_engine *sdma)
{
int ret = -EBUSY;
sdma->bd0 = dma_alloc_coherent(sdma->dev, PAGE_SIZE, &sdma->bd0_phys,
GFP_NOWAIT);
if (!sdma->bd0) {
ret = -ENOMEM;
goto out;
}
sdma->channel_control[0].base_bd_ptr = sdma->bd0_phys;
sdma->channel_control[0].current_bd_ptr = sdma->bd0_phys;
sdma_set_channel_priority(&sdma->channel[0], MXC_SDMA_DEFAULT_PRIORITY);
return 0;
out:
return ret;
}
static int sdma_alloc_bd(struct sdma_desc *desc)
{
u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
int ret = 0;
desc->bd = dma_alloc_coherent(desc->sdmac->sdma->dev, bd_size,
&desc->bd_phys, GFP_NOWAIT);
if (!desc->bd) {
ret = -ENOMEM;
goto out;
}
out:
return ret;
}
static void sdma_free_bd(struct sdma_desc *desc)
{
u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
dma_free_coherent(desc->sdmac->sdma->dev, bd_size, desc->bd,
desc->bd_phys);
}
static void sdma_desc_free(struct virt_dma_desc *vd)
{
struct sdma_desc *desc = container_of(vd, struct sdma_desc, vd);
sdma_free_bd(desc);
kfree(desc);
}
static int sdma_alloc_chan_resources(struct dma_chan *chan)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct imx_dma_data *data = chan->private;
struct imx_dma_data mem_data;
int prio, ret;
/*
* MEMCPY may never setup chan->private by filter function such as
* dmatest, thus create 'struct imx_dma_data mem_data' for this case.
* Please note in any other slave case, you have to setup chan->private
* with 'struct imx_dma_data' in your own filter function if you want to
* request dma channel by dma_request_channel() rather than
* dma_request_slave_channel(). Othwise, 'MEMCPY in case?' will appear
* to warn you to correct your filter function.
*/
if (!data) {
dev_dbg(sdmac->sdma->dev, "MEMCPY in case?\n");
mem_data.priority = 2;
mem_data.peripheral_type = IMX_DMATYPE_MEMORY;
mem_data.dma_request = 0;
mem_data.dma_request2 = 0;
data = &mem_data;
ret = sdma_get_pc(sdmac, IMX_DMATYPE_MEMORY);
if (ret)
return ret;
}
switch (data->priority) {
case DMA_PRIO_HIGH:
prio = 3;
break;
case DMA_PRIO_MEDIUM:
prio = 2;
break;
case DMA_PRIO_LOW:
default:
prio = 1;
break;
}
sdmac->peripheral_type = data->peripheral_type;
sdmac->event_id0 = data->dma_request;
sdmac->event_id1 = data->dma_request2;
ret = clk_enable(sdmac->sdma->clk_ipg);
if (ret)
return ret;
ret = clk_enable(sdmac->sdma->clk_ahb);
if (ret)
goto disable_clk_ipg;
ret = sdma_set_channel_priority(sdmac, prio);
if (ret)
goto disable_clk_ahb;
return 0;
disable_clk_ahb:
clk_disable(sdmac->sdma->clk_ahb);
disable_clk_ipg:
clk_disable(sdmac->sdma->clk_ipg);
return ret;
}
static void sdma_free_chan_resources(struct dma_chan *chan)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct sdma_engine *sdma = sdmac->sdma;
sdma_terminate_all(chan);
sdma_channel_synchronize(chan);
sdma_event_disable(sdmac, sdmac->event_id0);
if (sdmac->event_id1)
sdma_event_disable(sdmac, sdmac->event_id1);
sdmac->event_id0 = 0;
sdmac->event_id1 = 0;
sdma_set_channel_priority(sdmac, 0);
clk_disable(sdma->clk_ipg);
clk_disable(sdma->clk_ahb);
}
static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,
enum dma_transfer_direction direction, u32 bds)
{
struct sdma_desc *desc;
if (!sdmac->sdma->fw_loaded && sdmac->is_ram_script) {
dev_warn_once(sdmac->sdma->dev, "sdma firmware not ready!\n");
goto err_out;
}
desc = kzalloc((sizeof(*desc)), GFP_NOWAIT);
if (!desc)
goto err_out;
sdmac->status = DMA_IN_PROGRESS;
sdmac->direction = direction;
sdmac->flags = 0;
desc->chn_count = 0;
desc->chn_real_count = 0;
desc->buf_tail = 0;
desc->buf_ptail = 0;
desc->sdmac = sdmac;
desc->num_bd = bds;
if (bds && sdma_alloc_bd(desc))
goto err_desc_out;
/* No slave_config called in MEMCPY case, so do here */
if (direction == DMA_MEM_TO_MEM)
sdma_config_ownership(sdmac, false, true, false);
if (sdma_load_context(sdmac))
goto err_bd_out;
return desc;
err_bd_out:
sdma_free_bd(desc);
err_desc_out:
kfree(desc);
err_out:
return NULL;
}
static struct dma_async_tx_descriptor *sdma_prep_memcpy(
struct dma_chan *chan, dma_addr_t dma_dst,
dma_addr_t dma_src, size_t len, unsigned long flags)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct sdma_engine *sdma = sdmac->sdma;
int channel = sdmac->channel;
size_t count;
int i = 0, param;
struct sdma_buffer_descriptor *bd;
struct sdma_desc *desc;
if (!chan || !len)
return NULL;
dev_dbg(sdma->dev, "memcpy: %pad->%pad, len=%zu, channel=%d.\n",
&dma_src, &dma_dst, len, channel);
desc = sdma_transfer_init(sdmac, DMA_MEM_TO_MEM,
len / SDMA_BD_MAX_CNT + 1);
if (!desc)
return NULL;
do {
count = min_t(size_t, len, SDMA_BD_MAX_CNT);
bd = &desc->bd[i];
bd->buffer_addr = dma_src;
bd->ext_buffer_addr = dma_dst;
bd->mode.count = count;
desc->chn_count += count;
bd->mode.command = 0;
dma_src += count;
dma_dst += count;
len -= count;
i++;
param = BD_DONE | BD_EXTD | BD_CONT;
/* last bd */
if (!len) {
param |= BD_INTR;
param |= BD_LAST;
param &= ~BD_CONT;
}
dev_dbg(sdma->dev, "entry %d: count: %zd dma: 0x%x %s%s\n",
i, count, bd->buffer_addr,
param & BD_WRAP ? "wrap" : "",
param & BD_INTR ? " intr" : "");
bd->mode.status = param;
} while (len);
return vchan_tx_prep(&sdmac->vc, &desc->vd, flags);
}
static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct sdma_engine *sdma = sdmac->sdma;
int i, count;
int channel = sdmac->channel;
struct scatterlist *sg;
struct sdma_desc *desc;
sdma_config_write(chan, &sdmac->slave_config, direction);
desc = sdma_transfer_init(sdmac, direction, sg_len);
if (!desc)
goto err_out;
dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n",
sg_len, channel);
for_each_sg(sgl, sg, sg_len, i) {
struct sdma_buffer_descriptor *bd = &desc->bd[i];
int param;
bd->buffer_addr = sg->dma_address;
count = sg_dma_len(sg);
if (count > SDMA_BD_MAX_CNT) {
dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n",
channel, count, SDMA_BD_MAX_CNT);
goto err_bd_out;
}
bd->mode.count = count;
desc->chn_count += count;
if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES)
goto err_bd_out;
switch (sdmac->word_size) {
case DMA_SLAVE_BUSWIDTH_4_BYTES:
bd->mode.command = 0;
if (count & 3 || sg->dma_address & 3)
goto err_bd_out;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
bd->mode.command = 2;
if (count & 1 || sg->dma_address & 1)
goto err_bd_out;
break;
case DMA_SLAVE_BUSWIDTH_1_BYTE:
bd->mode.command = 1;
break;
default:
goto err_bd_out;
}
param = BD_DONE | BD_EXTD | BD_CONT;
if (i + 1 == sg_len) {
param |= BD_INTR;
param |= BD_LAST;
param &= ~BD_CONT;
}
dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n",
i, count, (u64)sg->dma_address,
param & BD_WRAP ? "wrap" : "",
param & BD_INTR ? " intr" : "");
bd->mode.status = param;
}
return vchan_tx_prep(&sdmac->vc, &desc->vd, flags);
err_bd_out:
sdma_free_bd(desc);
kfree(desc);
err_out:
sdmac->status = DMA_ERROR;
return NULL;
}
static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct sdma_engine *sdma = sdmac->sdma;
int num_periods = 0;
int channel = sdmac->channel;
int i = 0, buf = 0;
struct sdma_desc *desc;
dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel);
if (sdmac->peripheral_type != IMX_DMATYPE_HDMI)
num_periods = buf_len / period_len;
sdma_config_write(chan, &sdmac->slave_config, direction);
desc = sdma_transfer_init(sdmac, direction, num_periods);
if (!desc)
goto err_out;
desc->period_len = period_len;
sdmac->flags |= IMX_DMA_SG_LOOP;
if (period_len > SDMA_BD_MAX_CNT) {
dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %zu > %d\n",
channel, period_len, SDMA_BD_MAX_CNT);
goto err_bd_out;
}
if (sdmac->peripheral_type == IMX_DMATYPE_HDMI)
return vchan_tx_prep(&sdmac->vc, &desc->vd, flags);
while (buf < buf_len) {
struct sdma_buffer_descriptor *bd = &desc->bd[i];
int param;
bd->buffer_addr = dma_addr;
bd->mode.count = period_len;
if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES)
goto err_bd_out;
if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES)
bd->mode.command = 0;
else
bd->mode.command = sdmac->word_size;
param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR;
if (i + 1 == num_periods)
param |= BD_WRAP;
dev_dbg(sdma->dev, "entry %d: count: %zu dma: %#llx %s%s\n",
i, period_len, (u64)dma_addr,
param & BD_WRAP ? "wrap" : "",
param & BD_INTR ? " intr" : "");
bd->mode.status = param;
dma_addr += period_len;
buf += period_len;
i++;
}
return vchan_tx_prep(&sdmac->vc, &desc->vd, flags);
err_bd_out:
sdma_free_bd(desc);
kfree(desc);
err_out:
sdmac->status = DMA_ERROR;
return NULL;
}
static int sdma_config_write(struct dma_chan *chan,
struct dma_slave_config *dmaengine_cfg,
enum dma_transfer_direction direction)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
if (direction == DMA_DEV_TO_MEM) {
sdmac->per_address = dmaengine_cfg->src_addr;
sdmac->watermark_level = dmaengine_cfg->src_maxburst *
dmaengine_cfg->src_addr_width;
sdmac->word_size = dmaengine_cfg->src_addr_width;
} else if (direction == DMA_DEV_TO_DEV) {
sdmac->per_address2 = dmaengine_cfg->src_addr;
sdmac->per_address = dmaengine_cfg->dst_addr;
sdmac->watermark_level = dmaengine_cfg->src_maxburst &
SDMA_WATERMARK_LEVEL_LWML;
sdmac->watermark_level |= (dmaengine_cfg->dst_maxburst << 16) &
SDMA_WATERMARK_LEVEL_HWML;
sdmac->word_size = dmaengine_cfg->dst_addr_width;
} else if (sdmac->peripheral_type == IMX_DMATYPE_HDMI) {
sdmac->per_address = dmaengine_cfg->dst_addr;
sdmac->per_address2 = dmaengine_cfg->src_addr;
sdmac->watermark_level = 0;
} else {
sdmac->per_address = dmaengine_cfg->dst_addr;
sdmac->watermark_level = dmaengine_cfg->dst_maxburst *
dmaengine_cfg->dst_addr_width;
sdmac->word_size = dmaengine_cfg->dst_addr_width;
}
sdmac->direction = direction;
return sdma_config_channel(chan);
}
static int sdma_config(struct dma_chan *chan,
struct dma_slave_config *dmaengine_cfg)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct sdma_engine *sdma = sdmac->sdma;
memcpy(&sdmac->slave_config, dmaengine_cfg, sizeof(*dmaengine_cfg));
if (dmaengine_cfg->peripheral_config) {
struct sdma_peripheral_config *sdmacfg = dmaengine_cfg->peripheral_config;
if (dmaengine_cfg->peripheral_size != sizeof(struct sdma_peripheral_config)) {
dev_err(sdma->dev, "Invalid peripheral size %zu, expected %zu\n",
dmaengine_cfg->peripheral_size,
sizeof(struct sdma_peripheral_config));
return -EINVAL;
}
sdmac->n_fifos_src = sdmacfg->n_fifos_src;
sdmac->n_fifos_dst = sdmacfg->n_fifos_dst;
sdmac->stride_fifos_src = sdmacfg->stride_fifos_src;
sdmac->stride_fifos_dst = sdmacfg->stride_fifos_dst;
sdmac->words_per_fifo = sdmacfg->words_per_fifo;
sdmac->sw_done = sdmacfg->sw_done;
}
/* Set ENBLn earlier to make sure dma request triggered after that */
if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events)
return -EINVAL;
sdma_event_enable(sdmac, sdmac->event_id0);
if (sdmac->event_id1) {
if (sdmac->event_id1 >= sdmac->sdma->drvdata->num_events)
return -EINVAL;
sdma_event_enable(sdmac, sdmac->event_id1);
}
return 0;
}
static enum dma_status sdma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct sdma_desc *desc = NULL;
u32 residue;
struct virt_dma_desc *vd;
enum dma_status ret;
unsigned long flags;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&sdmac->vc.lock, flags);
vd = vchan_find_desc(&sdmac->vc, cookie);
if (vd)
desc = to_sdma_desc(&vd->tx);
else if (sdmac->desc && sdmac->desc->vd.tx.cookie == cookie)
desc = sdmac->desc;
if (desc) {
if (sdmac->flags & IMX_DMA_SG_LOOP)
residue = (desc->num_bd - desc->buf_ptail) *
desc->period_len - desc->chn_real_count;
else
residue = desc->chn_count - desc->chn_real_count;
} else {
residue = 0;
}
spin_unlock_irqrestore(&sdmac->vc.lock, flags);
dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie,
residue);
return sdmac->status;
}
static void sdma_issue_pending(struct dma_chan *chan)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&sdmac->vc.lock, flags);
if (vchan_issue_pending(&sdmac->vc) && !sdmac->desc)
sdma_start_desc(sdmac);
spin_unlock_irqrestore(&sdmac->vc.lock, flags);
}
#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34
#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2 38
#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 45
#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V4 46
static void sdma_add_scripts(struct sdma_engine *sdma,
const struct sdma_script_start_addrs *addr)
{
s32 *addr_arr = (u32 *)addr;
s32 *saddr_arr = (u32 *)sdma->script_addrs;
int i;
/* use the default firmware in ROM if missing external firmware */
if (!sdma->script_number)
sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1;
if (sdma->script_number > sizeof(struct sdma_script_start_addrs)
/ sizeof(s32)) {
dev_err(sdma->dev,
"SDMA script number %d not match with firmware.\n",
sdma->script_number);
return;
}
for (i = 0; i < sdma->script_number; i++)
if (addr_arr[i] > 0)
saddr_arr[i] = addr_arr[i];
/*
* For compatibility with NXP internal legacy kernel before 4.19 which
* is based on uart ram script and mainline kernel based on uart rom
* script, both uart ram/rom scripts are present in newer sdma
* firmware. Use the rom versions if they are present (V3 or newer).
*/
if (sdma->script_number >= SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3) {
if (addr->uart_2_mcu_rom_addr)
sdma->script_addrs->uart_2_mcu_addr = addr->uart_2_mcu_rom_addr;
if (addr->uartsh_2_mcu_rom_addr)
sdma->script_addrs->uartsh_2_mcu_addr = addr->uartsh_2_mcu_rom_addr;
}
}
static void sdma_load_firmware(const struct firmware *fw, void *context)
{
struct sdma_engine *sdma = context;
const struct sdma_firmware_header *header;
const struct sdma_script_start_addrs *addr;
unsigned short *ram_code;
if (!fw) {
dev_info(sdma->dev, "external firmware not found, using ROM firmware\n");
/* In this case we just use the ROM firmware. */
return;
}
if (fw->size < sizeof(*header))
goto err_firmware;
header = (struct sdma_firmware_header *)fw->data;
if (header->magic != SDMA_FIRMWARE_MAGIC)
goto err_firmware;
if (header->ram_code_start + header->ram_code_size > fw->size)
goto err_firmware;
switch (header->version_major) {
case 1:
sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1;
break;
case 2:
sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2;
break;
case 3:
sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3;
break;
case 4:
sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V4;
break;
default:
dev_err(sdma->dev, "unknown firmware version\n");
goto err_firmware;
}
addr = (void *)header + header->script_addrs_start;
ram_code = (void *)header + header->ram_code_start;
clk_enable(sdma->clk_ipg);
clk_enable(sdma->clk_ahb);
/* download the RAM image for SDMA */
sdma_load_script(sdma, ram_code,
header->ram_code_size,
addr->ram_code_start_addr);
clk_disable(sdma->clk_ipg);
clk_disable(sdma->clk_ahb);
sdma_add_scripts(sdma, addr);
sdma->fw_loaded = true;
dev_info(sdma->dev, "loaded firmware %d.%d\n",
header->version_major,
header->version_minor);
err_firmware:
release_firmware(fw);
}
#define EVENT_REMAP_CELLS 3
static int sdma_event_remap(struct sdma_engine *sdma)
{
struct device_node *np = sdma->dev->of_node;
struct device_node *gpr_np = of_parse_phandle(np, "gpr", 0);
struct property *event_remap;
struct regmap *gpr;
char propname[] = "fsl,sdma-event-remap";
u32 reg, val, shift, num_map, i;
int ret = 0;
if (IS_ERR(np) || !gpr_np)
goto out;
event_remap = of_find_property(np, propname, NULL);
num_map = event_remap ? (event_remap->length / sizeof(u32)) : 0;
if (!num_map) {
dev_dbg(sdma->dev, "no event needs to be remapped\n");
goto out;
} else if (num_map % EVENT_REMAP_CELLS) {
dev_err(sdma->dev, "the property %s must modulo %d\n",
propname, EVENT_REMAP_CELLS);
ret = -EINVAL;
goto out;
}
gpr = syscon_node_to_regmap(gpr_np);
if (IS_ERR(gpr)) {
dev_err(sdma->dev, "failed to get gpr regmap\n");
ret = PTR_ERR(gpr);
goto out;
}
for (i = 0; i < num_map; i += EVENT_REMAP_CELLS) {
ret = of_property_read_u32_index(np, propname, i, ®);
if (ret) {
dev_err(sdma->dev, "failed to read property %s index %d\n",
propname, i);
goto out;
}
ret = of_property_read_u32_index(np, propname, i + 1, &shift);
if (ret) {
dev_err(sdma->dev, "failed to read property %s index %d\n",
propname, i + 1);
goto out;
}
ret = of_property_read_u32_index(np, propname, i + 2, &val);
if (ret) {
dev_err(sdma->dev, "failed to read property %s index %d\n",
propname, i + 2);
goto out;
}
regmap_update_bits(gpr, reg, BIT(shift), val << shift);
}
out:
if (gpr_np)
of_node_put(gpr_np);
return ret;
}
static int sdma_get_firmware(struct sdma_engine *sdma,
const char *fw_name)
{
int ret;
ret = request_firmware_nowait(THIS_MODULE,
FW_ACTION_UEVENT, fw_name, sdma->dev,
GFP_KERNEL, sdma, sdma_load_firmware);
return ret;
}
static int sdma_init(struct sdma_engine *sdma)
{
int i, ret;
dma_addr_t ccb_phys;
ret = clk_enable(sdma->clk_ipg);
if (ret)
return ret;
ret = clk_enable(sdma->clk_ahb);
if (ret)
goto disable_clk_ipg;
if (sdma->drvdata->check_ratio &&
(clk_get_rate(sdma->clk_ahb) == clk_get_rate(sdma->clk_ipg)))
sdma->clk_ratio = 1;
/* Be sure SDMA has not started yet */
writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
sdma->channel_control = dma_alloc_coherent(sdma->dev,
MAX_DMA_CHANNELS * sizeof(struct sdma_channel_control) +
sizeof(struct sdma_context_data),
&ccb_phys, GFP_KERNEL);
if (!sdma->channel_control) {
ret = -ENOMEM;
goto err_dma_alloc;
}
sdma->context = (void *)sdma->channel_control +
MAX_DMA_CHANNELS * sizeof(struct sdma_channel_control);
sdma->context_phys = ccb_phys +
MAX_DMA_CHANNELS * sizeof(struct sdma_channel_control);
/* disable all channels */
for (i = 0; i < sdma->drvdata->num_events; i++)
writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i));
/* All channels have priority 0 */
for (i = 0; i < MAX_DMA_CHANNELS; i++)
writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4);
ret = sdma_request_channel0(sdma);
if (ret)
goto err_dma_alloc;
sdma_config_ownership(&sdma->channel[0], false, true, false);
/* Set Command Channel (Channel Zero) */
writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR);
/* Set bits of CONFIG register but with static context switching */
if (sdma->clk_ratio)
writel_relaxed(SDMA_H_CONFIG_ACR, sdma->regs + SDMA_H_CONFIG);
else
writel_relaxed(0, sdma->regs + SDMA_H_CONFIG);
writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR);
/* Initializes channel's priorities */
sdma_set_channel_priority(&sdma->channel[0], 7);
clk_disable(sdma->clk_ipg);
clk_disable(sdma->clk_ahb);
return 0;
err_dma_alloc:
clk_disable(sdma->clk_ahb);
disable_clk_ipg:
clk_disable(sdma->clk_ipg);
dev_err(sdma->dev, "initialisation failed with %d\n", ret);
return ret;
}
static bool sdma_filter_fn(struct dma_chan *chan, void *fn_param)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct imx_dma_data *data = fn_param;
if (!imx_dma_is_general_purpose(chan))
return false;
sdmac->data = *data;
chan->private = &sdmac->data;
return true;
}
static struct dma_chan *sdma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct sdma_engine *sdma = ofdma->of_dma_data;
dma_cap_mask_t mask = sdma->dma_device.cap_mask;
struct imx_dma_data data;
if (dma_spec->args_count != 3)
return NULL;
data.dma_request = dma_spec->args[0];
data.peripheral_type = dma_spec->args[1];
data.priority = dma_spec->args[2];
/*
* init dma_request2 to zero, which is not used by the dts.
* For P2P, dma_request2 is init from dma_request_channel(),
* chan->private will point to the imx_dma_data, and in
* device_alloc_chan_resources(), imx_dma_data.dma_request2 will
* be set to sdmac->event_id1.
*/
data.dma_request2 = 0;
return __dma_request_channel(&mask, sdma_filter_fn, &data,
ofdma->of_node);
}
static int sdma_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *spba_bus;
const char *fw_name;
int ret;
int irq;
struct resource spba_res;
int i;
struct sdma_engine *sdma;
s32 *saddr_arr;
ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
sdma = devm_kzalloc(&pdev->dev, sizeof(*sdma), GFP_KERNEL);
if (!sdma)
return -ENOMEM;
spin_lock_init(&sdma->channel_0_lock);
sdma->dev = &pdev->dev;
sdma->drvdata = of_device_get_match_data(sdma->dev);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
sdma->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(sdma->regs))
return PTR_ERR(sdma->regs);
sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(sdma->clk_ipg))
return PTR_ERR(sdma->clk_ipg);
sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(sdma->clk_ahb))
return PTR_ERR(sdma->clk_ahb);
ret = clk_prepare(sdma->clk_ipg);
if (ret)
return ret;
ret = clk_prepare(sdma->clk_ahb);
if (ret)
goto err_clk;
ret = devm_request_irq(&pdev->dev, irq, sdma_int_handler, 0,
dev_name(&pdev->dev), sdma);
if (ret)
goto err_irq;
sdma->irq = irq;
sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL);
if (!sdma->script_addrs) {
ret = -ENOMEM;
goto err_irq;
}
/* initially no scripts available */
saddr_arr = (s32 *)sdma->script_addrs;
for (i = 0; i < sizeof(*sdma->script_addrs) / sizeof(s32); i++)
saddr_arr[i] = -EINVAL;
dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);
dma_cap_set(DMA_MEMCPY, sdma->dma_device.cap_mask);
dma_cap_set(DMA_PRIVATE, sdma->dma_device.cap_mask);
INIT_LIST_HEAD(&sdma->dma_device.channels);
/* Initialize channel parameters */
for (i = 0; i < MAX_DMA_CHANNELS; i++) {
struct sdma_channel *sdmac = &sdma->channel[i];
sdmac->sdma = sdma;
sdmac->channel = i;
sdmac->vc.desc_free = sdma_desc_free;
INIT_LIST_HEAD(&sdmac->terminated);
INIT_WORK(&sdmac->terminate_worker,
sdma_channel_terminate_work);
/*
* Add the channel to the DMAC list. Do not add channel 0 though
* because we need it internally in the SDMA driver. This also means
* that channel 0 in dmaengine counting matches sdma channel 1.
*/
if (i)
vchan_init(&sdmac->vc, &sdma->dma_device);
}
ret = sdma_init(sdma);
if (ret)
goto err_init;
ret = sdma_event_remap(sdma);
if (ret)
goto err_init;
if (sdma->drvdata->script_addrs)
sdma_add_scripts(sdma, sdma->drvdata->script_addrs);
sdma->dma_device.dev = &pdev->dev;
sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources;
sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources;
sdma->dma_device.device_tx_status = sdma_tx_status;
sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg;
sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic;
sdma->dma_device.device_config = sdma_config;
sdma->dma_device.device_terminate_all = sdma_terminate_all;
sdma->dma_device.device_synchronize = sdma_channel_synchronize;
sdma->dma_device.src_addr_widths = SDMA_DMA_BUSWIDTHS;
sdma->dma_device.dst_addr_widths = SDMA_DMA_BUSWIDTHS;
sdma->dma_device.directions = SDMA_DMA_DIRECTIONS;
sdma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
sdma->dma_device.device_prep_dma_memcpy = sdma_prep_memcpy;
sdma->dma_device.device_issue_pending = sdma_issue_pending;
sdma->dma_device.copy_align = 2;
dma_set_max_seg_size(sdma->dma_device.dev, SDMA_BD_MAX_CNT);
platform_set_drvdata(pdev, sdma);
ret = dma_async_device_register(&sdma->dma_device);
if (ret) {
dev_err(&pdev->dev, "unable to register\n");
goto err_init;
}
if (np) {
ret = of_dma_controller_register(np, sdma_xlate, sdma);
if (ret) {
dev_err(&pdev->dev, "failed to register controller\n");
goto err_register;
}
spba_bus = of_find_compatible_node(NULL, NULL, "fsl,spba-bus");
ret = of_address_to_resource(spba_bus, 0, &spba_res);
if (!ret) {
sdma->spba_start_addr = spba_res.start;
sdma->spba_end_addr = spba_res.end;
}
of_node_put(spba_bus);
}
/*
* Because that device tree does not encode ROM script address,
* the RAM script in firmware is mandatory for device tree
* probe, otherwise it fails.
*/
ret = of_property_read_string(np, "fsl,sdma-ram-script-name",
&fw_name);
if (ret) {
dev_warn(&pdev->dev, "failed to get firmware name\n");
} else {
ret = sdma_get_firmware(sdma, fw_name);
if (ret)
dev_warn(&pdev->dev, "failed to get firmware from device tree\n");
}
return 0;
err_register:
dma_async_device_unregister(&sdma->dma_device);
err_init:
kfree(sdma->script_addrs);
err_irq:
clk_unprepare(sdma->clk_ahb);
err_clk:
clk_unprepare(sdma->clk_ipg);
return ret;
}
static int sdma_remove(struct platform_device *pdev)
{
struct sdma_engine *sdma = platform_get_drvdata(pdev);
int i;
devm_free_irq(&pdev->dev, sdma->irq, sdma);
dma_async_device_unregister(&sdma->dma_device);
kfree(sdma->script_addrs);
clk_unprepare(sdma->clk_ahb);
clk_unprepare(sdma->clk_ipg);
/* Kill the tasklet */
for (i = 0; i < MAX_DMA_CHANNELS; i++) {
struct sdma_channel *sdmac = &sdma->channel[i];
tasklet_kill(&sdmac->vc.task);
sdma_free_chan_resources(&sdmac->vc.chan);
}
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver sdma_driver = {
.driver = {
.name = "imx-sdma",
.of_match_table = sdma_dt_ids,
},
.remove = sdma_remove,
.probe = sdma_probe,
};
module_platform_driver(sdma_driver);
MODULE_AUTHOR("Sascha Hauer, Pengutronix <[email protected]>");
MODULE_DESCRIPTION("i.MX SDMA driver");
#if IS_ENABLED(CONFIG_SOC_IMX6Q)
MODULE_FIRMWARE("imx/sdma/sdma-imx6q.bin");
#endif
#if IS_ENABLED(CONFIG_SOC_IMX7D) || IS_ENABLED(CONFIG_SOC_IMX8M)
MODULE_FIRMWARE("imx/sdma/sdma-imx7d.bin");
#endif
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/imx-sdma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* IMG Multi-threaded DMA Controller (MDC)
*
* Copyright (C) 2009,2012,2013 Imagination Technologies Ltd.
* Copyright (C) 2014 Google, Inc.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include "dmaengine.h"
#include "virt-dma.h"
#define MDC_MAX_DMA_CHANNELS 32
#define MDC_GENERAL_CONFIG 0x000
#define MDC_GENERAL_CONFIG_LIST_IEN BIT(31)
#define MDC_GENERAL_CONFIG_IEN BIT(29)
#define MDC_GENERAL_CONFIG_LEVEL_INT BIT(28)
#define MDC_GENERAL_CONFIG_INC_W BIT(12)
#define MDC_GENERAL_CONFIG_INC_R BIT(8)
#define MDC_GENERAL_CONFIG_PHYSICAL_W BIT(7)
#define MDC_GENERAL_CONFIG_WIDTH_W_SHIFT 4
#define MDC_GENERAL_CONFIG_WIDTH_W_MASK 0x7
#define MDC_GENERAL_CONFIG_PHYSICAL_R BIT(3)
#define MDC_GENERAL_CONFIG_WIDTH_R_SHIFT 0
#define MDC_GENERAL_CONFIG_WIDTH_R_MASK 0x7
#define MDC_READ_PORT_CONFIG 0x004
#define MDC_READ_PORT_CONFIG_STHREAD_SHIFT 28
#define MDC_READ_PORT_CONFIG_STHREAD_MASK 0xf
#define MDC_READ_PORT_CONFIG_RTHREAD_SHIFT 24
#define MDC_READ_PORT_CONFIG_RTHREAD_MASK 0xf
#define MDC_READ_PORT_CONFIG_WTHREAD_SHIFT 16
#define MDC_READ_PORT_CONFIG_WTHREAD_MASK 0xf
#define MDC_READ_PORT_CONFIG_BURST_SIZE_SHIFT 4
#define MDC_READ_PORT_CONFIG_BURST_SIZE_MASK 0xff
#define MDC_READ_PORT_CONFIG_DREQ_ENABLE BIT(1)
#define MDC_READ_ADDRESS 0x008
#define MDC_WRITE_ADDRESS 0x00c
#define MDC_TRANSFER_SIZE 0x010
#define MDC_TRANSFER_SIZE_MASK 0xffffff
#define MDC_LIST_NODE_ADDRESS 0x014
#define MDC_CMDS_PROCESSED 0x018
#define MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT 16
#define MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK 0x3f
#define MDC_CMDS_PROCESSED_INT_ACTIVE BIT(8)
#define MDC_CMDS_PROCESSED_CMDS_DONE_SHIFT 0
#define MDC_CMDS_PROCESSED_CMDS_DONE_MASK 0x3f
#define MDC_CONTROL_AND_STATUS 0x01c
#define MDC_CONTROL_AND_STATUS_CANCEL BIT(20)
#define MDC_CONTROL_AND_STATUS_LIST_EN BIT(4)
#define MDC_CONTROL_AND_STATUS_EN BIT(0)
#define MDC_ACTIVE_TRANSFER_SIZE 0x030
#define MDC_GLOBAL_CONFIG_A 0x900
#define MDC_GLOBAL_CONFIG_A_THREAD_ID_WIDTH_SHIFT 16
#define MDC_GLOBAL_CONFIG_A_THREAD_ID_WIDTH_MASK 0xff
#define MDC_GLOBAL_CONFIG_A_DMA_CONTEXTS_SHIFT 8
#define MDC_GLOBAL_CONFIG_A_DMA_CONTEXTS_MASK 0xff
#define MDC_GLOBAL_CONFIG_A_SYS_DAT_WIDTH_SHIFT 0
#define MDC_GLOBAL_CONFIG_A_SYS_DAT_WIDTH_MASK 0xff
struct mdc_hw_list_desc {
u32 gen_conf;
u32 readport_conf;
u32 read_addr;
u32 write_addr;
u32 xfer_size;
u32 node_addr;
u32 cmds_done;
u32 ctrl_status;
/*
* Not part of the list descriptor, but instead used by the CPU to
* traverse the list.
*/
struct mdc_hw_list_desc *next_desc;
};
struct mdc_tx_desc {
struct mdc_chan *chan;
struct virt_dma_desc vd;
dma_addr_t list_phys;
struct mdc_hw_list_desc *list;
bool cyclic;
bool cmd_loaded;
unsigned int list_len;
unsigned int list_period_len;
size_t list_xfer_size;
unsigned int list_cmds_done;
};
struct mdc_chan {
struct mdc_dma *mdma;
struct virt_dma_chan vc;
struct dma_slave_config config;
struct mdc_tx_desc *desc;
int irq;
unsigned int periph;
unsigned int thread;
unsigned int chan_nr;
};
struct mdc_dma_soc_data {
void (*enable_chan)(struct mdc_chan *mchan);
void (*disable_chan)(struct mdc_chan *mchan);
};
struct mdc_dma {
struct dma_device dma_dev;
void __iomem *regs;
struct clk *clk;
struct dma_pool *desc_pool;
struct regmap *periph_regs;
spinlock_t lock;
unsigned int nr_threads;
unsigned int nr_channels;
unsigned int bus_width;
unsigned int max_burst_mult;
unsigned int max_xfer_size;
const struct mdc_dma_soc_data *soc;
struct mdc_chan channels[MDC_MAX_DMA_CHANNELS];
};
static inline u32 mdc_readl(struct mdc_dma *mdma, u32 reg)
{
return readl(mdma->regs + reg);
}
static inline void mdc_writel(struct mdc_dma *mdma, u32 val, u32 reg)
{
writel(val, mdma->regs + reg);
}
static inline u32 mdc_chan_readl(struct mdc_chan *mchan, u32 reg)
{
return mdc_readl(mchan->mdma, mchan->chan_nr * 0x040 + reg);
}
static inline void mdc_chan_writel(struct mdc_chan *mchan, u32 val, u32 reg)
{
mdc_writel(mchan->mdma, val, mchan->chan_nr * 0x040 + reg);
}
static inline struct mdc_chan *to_mdc_chan(struct dma_chan *c)
{
return container_of(to_virt_chan(c), struct mdc_chan, vc);
}
static inline struct mdc_tx_desc *to_mdc_desc(struct dma_async_tx_descriptor *t)
{
struct virt_dma_desc *vdesc = container_of(t, struct virt_dma_desc, tx);
return container_of(vdesc, struct mdc_tx_desc, vd);
}
static inline struct device *mdma2dev(struct mdc_dma *mdma)
{
return mdma->dma_dev.dev;
}
static inline unsigned int to_mdc_width(unsigned int bytes)
{
return ffs(bytes) - 1;
}
static inline void mdc_set_read_width(struct mdc_hw_list_desc *ldesc,
unsigned int bytes)
{
ldesc->gen_conf |= to_mdc_width(bytes) <<
MDC_GENERAL_CONFIG_WIDTH_R_SHIFT;
}
static inline void mdc_set_write_width(struct mdc_hw_list_desc *ldesc,
unsigned int bytes)
{
ldesc->gen_conf |= to_mdc_width(bytes) <<
MDC_GENERAL_CONFIG_WIDTH_W_SHIFT;
}
static void mdc_list_desc_config(struct mdc_chan *mchan,
struct mdc_hw_list_desc *ldesc,
enum dma_transfer_direction dir,
dma_addr_t src, dma_addr_t dst, size_t len)
{
struct mdc_dma *mdma = mchan->mdma;
unsigned int max_burst, burst_size;
ldesc->gen_conf = MDC_GENERAL_CONFIG_IEN | MDC_GENERAL_CONFIG_LIST_IEN |
MDC_GENERAL_CONFIG_LEVEL_INT | MDC_GENERAL_CONFIG_PHYSICAL_W |
MDC_GENERAL_CONFIG_PHYSICAL_R;
ldesc->readport_conf =
(mchan->thread << MDC_READ_PORT_CONFIG_STHREAD_SHIFT) |
(mchan->thread << MDC_READ_PORT_CONFIG_RTHREAD_SHIFT) |
(mchan->thread << MDC_READ_PORT_CONFIG_WTHREAD_SHIFT);
ldesc->read_addr = src;
ldesc->write_addr = dst;
ldesc->xfer_size = len - 1;
ldesc->node_addr = 0;
ldesc->cmds_done = 0;
ldesc->ctrl_status = MDC_CONTROL_AND_STATUS_LIST_EN |
MDC_CONTROL_AND_STATUS_EN;
ldesc->next_desc = NULL;
if (IS_ALIGNED(dst, mdma->bus_width) &&
IS_ALIGNED(src, mdma->bus_width))
max_burst = mdma->bus_width * mdma->max_burst_mult;
else
max_burst = mdma->bus_width * (mdma->max_burst_mult - 1);
if (dir == DMA_MEM_TO_DEV) {
ldesc->gen_conf |= MDC_GENERAL_CONFIG_INC_R;
ldesc->readport_conf |= MDC_READ_PORT_CONFIG_DREQ_ENABLE;
mdc_set_read_width(ldesc, mdma->bus_width);
mdc_set_write_width(ldesc, mchan->config.dst_addr_width);
burst_size = min(max_burst, mchan->config.dst_maxburst *
mchan->config.dst_addr_width);
} else if (dir == DMA_DEV_TO_MEM) {
ldesc->gen_conf |= MDC_GENERAL_CONFIG_INC_W;
ldesc->readport_conf |= MDC_READ_PORT_CONFIG_DREQ_ENABLE;
mdc_set_read_width(ldesc, mchan->config.src_addr_width);
mdc_set_write_width(ldesc, mdma->bus_width);
burst_size = min(max_burst, mchan->config.src_maxburst *
mchan->config.src_addr_width);
} else {
ldesc->gen_conf |= MDC_GENERAL_CONFIG_INC_R |
MDC_GENERAL_CONFIG_INC_W;
mdc_set_read_width(ldesc, mdma->bus_width);
mdc_set_write_width(ldesc, mdma->bus_width);
burst_size = max_burst;
}
ldesc->readport_conf |= (burst_size - 1) <<
MDC_READ_PORT_CONFIG_BURST_SIZE_SHIFT;
}
static void mdc_list_desc_free(struct mdc_tx_desc *mdesc)
{
struct mdc_dma *mdma = mdesc->chan->mdma;
struct mdc_hw_list_desc *curr, *next;
dma_addr_t curr_phys, next_phys;
curr = mdesc->list;
curr_phys = mdesc->list_phys;
while (curr) {
next = curr->next_desc;
next_phys = curr->node_addr;
dma_pool_free(mdma->desc_pool, curr, curr_phys);
curr = next;
curr_phys = next_phys;
}
}
static void mdc_desc_free(struct virt_dma_desc *vd)
{
struct mdc_tx_desc *mdesc = to_mdc_desc(&vd->tx);
mdc_list_desc_free(mdesc);
kfree(mdesc);
}
static struct dma_async_tx_descriptor *mdc_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, size_t len,
unsigned long flags)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
struct mdc_dma *mdma = mchan->mdma;
struct mdc_tx_desc *mdesc;
struct mdc_hw_list_desc *curr, *prev = NULL;
dma_addr_t curr_phys;
if (!len)
return NULL;
mdesc = kzalloc(sizeof(*mdesc), GFP_NOWAIT);
if (!mdesc)
return NULL;
mdesc->chan = mchan;
mdesc->list_xfer_size = len;
while (len > 0) {
size_t xfer_size;
curr = dma_pool_alloc(mdma->desc_pool, GFP_NOWAIT, &curr_phys);
if (!curr)
goto free_desc;
if (prev) {
prev->node_addr = curr_phys;
prev->next_desc = curr;
} else {
mdesc->list_phys = curr_phys;
mdesc->list = curr;
}
xfer_size = min_t(size_t, mdma->max_xfer_size, len);
mdc_list_desc_config(mchan, curr, DMA_MEM_TO_MEM, src, dest,
xfer_size);
prev = curr;
mdesc->list_len++;
src += xfer_size;
dest += xfer_size;
len -= xfer_size;
}
return vchan_tx_prep(&mchan->vc, &mdesc->vd, flags);
free_desc:
mdc_desc_free(&mdesc->vd);
return NULL;
}
static int mdc_check_slave_width(struct mdc_chan *mchan,
enum dma_transfer_direction dir)
{
enum dma_slave_buswidth width;
if (dir == DMA_MEM_TO_DEV)
width = mchan->config.dst_addr_width;
else
width = mchan->config.src_addr_width;
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
case DMA_SLAVE_BUSWIDTH_2_BYTES:
case DMA_SLAVE_BUSWIDTH_4_BYTES:
case DMA_SLAVE_BUSWIDTH_8_BYTES:
break;
default:
return -EINVAL;
}
if (width > mchan->mdma->bus_width)
return -EINVAL;
return 0;
}
static struct dma_async_tx_descriptor *mdc_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction dir,
unsigned long flags)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
struct mdc_dma *mdma = mchan->mdma;
struct mdc_tx_desc *mdesc;
struct mdc_hw_list_desc *curr, *prev = NULL;
dma_addr_t curr_phys;
if (!buf_len && !period_len)
return NULL;
if (!is_slave_direction(dir))
return NULL;
if (mdc_check_slave_width(mchan, dir) < 0)
return NULL;
mdesc = kzalloc(sizeof(*mdesc), GFP_NOWAIT);
if (!mdesc)
return NULL;
mdesc->chan = mchan;
mdesc->cyclic = true;
mdesc->list_xfer_size = buf_len;
mdesc->list_period_len = DIV_ROUND_UP(period_len,
mdma->max_xfer_size);
while (buf_len > 0) {
size_t remainder = min(period_len, buf_len);
while (remainder > 0) {
size_t xfer_size;
curr = dma_pool_alloc(mdma->desc_pool, GFP_NOWAIT,
&curr_phys);
if (!curr)
goto free_desc;
if (!prev) {
mdesc->list_phys = curr_phys;
mdesc->list = curr;
} else {
prev->node_addr = curr_phys;
prev->next_desc = curr;
}
xfer_size = min_t(size_t, mdma->max_xfer_size,
remainder);
if (dir == DMA_MEM_TO_DEV) {
mdc_list_desc_config(mchan, curr, dir,
buf_addr,
mchan->config.dst_addr,
xfer_size);
} else {
mdc_list_desc_config(mchan, curr, dir,
mchan->config.src_addr,
buf_addr,
xfer_size);
}
prev = curr;
mdesc->list_len++;
buf_addr += xfer_size;
buf_len -= xfer_size;
remainder -= xfer_size;
}
}
prev->node_addr = mdesc->list_phys;
return vchan_tx_prep(&mchan->vc, &mdesc->vd, flags);
free_desc:
mdc_desc_free(&mdesc->vd);
return NULL;
}
static struct dma_async_tx_descriptor *mdc_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
struct mdc_dma *mdma = mchan->mdma;
struct mdc_tx_desc *mdesc;
struct scatterlist *sg;
struct mdc_hw_list_desc *curr, *prev = NULL;
dma_addr_t curr_phys;
unsigned int i;
if (!sgl)
return NULL;
if (!is_slave_direction(dir))
return NULL;
if (mdc_check_slave_width(mchan, dir) < 0)
return NULL;
mdesc = kzalloc(sizeof(*mdesc), GFP_NOWAIT);
if (!mdesc)
return NULL;
mdesc->chan = mchan;
for_each_sg(sgl, sg, sg_len, i) {
dma_addr_t buf = sg_dma_address(sg);
size_t buf_len = sg_dma_len(sg);
while (buf_len > 0) {
size_t xfer_size;
curr = dma_pool_alloc(mdma->desc_pool, GFP_NOWAIT,
&curr_phys);
if (!curr)
goto free_desc;
if (!prev) {
mdesc->list_phys = curr_phys;
mdesc->list = curr;
} else {
prev->node_addr = curr_phys;
prev->next_desc = curr;
}
xfer_size = min_t(size_t, mdma->max_xfer_size,
buf_len);
if (dir == DMA_MEM_TO_DEV) {
mdc_list_desc_config(mchan, curr, dir, buf,
mchan->config.dst_addr,
xfer_size);
} else {
mdc_list_desc_config(mchan, curr, dir,
mchan->config.src_addr,
buf, xfer_size);
}
prev = curr;
mdesc->list_len++;
mdesc->list_xfer_size += xfer_size;
buf += xfer_size;
buf_len -= xfer_size;
}
}
return vchan_tx_prep(&mchan->vc, &mdesc->vd, flags);
free_desc:
mdc_desc_free(&mdesc->vd);
return NULL;
}
static void mdc_issue_desc(struct mdc_chan *mchan)
{
struct mdc_dma *mdma = mchan->mdma;
struct virt_dma_desc *vd;
struct mdc_tx_desc *mdesc;
u32 val;
vd = vchan_next_desc(&mchan->vc);
if (!vd)
return;
list_del(&vd->node);
mdesc = to_mdc_desc(&vd->tx);
mchan->desc = mdesc;
dev_dbg(mdma2dev(mdma), "Issuing descriptor on channel %d\n",
mchan->chan_nr);
mdma->soc->enable_chan(mchan);
val = mdc_chan_readl(mchan, MDC_GENERAL_CONFIG);
val |= MDC_GENERAL_CONFIG_LIST_IEN | MDC_GENERAL_CONFIG_IEN |
MDC_GENERAL_CONFIG_LEVEL_INT | MDC_GENERAL_CONFIG_PHYSICAL_W |
MDC_GENERAL_CONFIG_PHYSICAL_R;
mdc_chan_writel(mchan, val, MDC_GENERAL_CONFIG);
val = (mchan->thread << MDC_READ_PORT_CONFIG_STHREAD_SHIFT) |
(mchan->thread << MDC_READ_PORT_CONFIG_RTHREAD_SHIFT) |
(mchan->thread << MDC_READ_PORT_CONFIG_WTHREAD_SHIFT);
mdc_chan_writel(mchan, val, MDC_READ_PORT_CONFIG);
mdc_chan_writel(mchan, mdesc->list_phys, MDC_LIST_NODE_ADDRESS);
val = mdc_chan_readl(mchan, MDC_CONTROL_AND_STATUS);
val |= MDC_CONTROL_AND_STATUS_LIST_EN;
mdc_chan_writel(mchan, val, MDC_CONTROL_AND_STATUS);
}
static void mdc_issue_pending(struct dma_chan *chan)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
unsigned long flags;
spin_lock_irqsave(&mchan->vc.lock, flags);
if (vchan_issue_pending(&mchan->vc) && !mchan->desc)
mdc_issue_desc(mchan);
spin_unlock_irqrestore(&mchan->vc.lock, flags);
}
static enum dma_status mdc_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
struct mdc_tx_desc *mdesc;
struct virt_dma_desc *vd;
unsigned long flags;
size_t bytes = 0;
int ret;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
if (!txstate)
return ret;
spin_lock_irqsave(&mchan->vc.lock, flags);
vd = vchan_find_desc(&mchan->vc, cookie);
if (vd) {
mdesc = to_mdc_desc(&vd->tx);
bytes = mdesc->list_xfer_size;
} else if (mchan->desc && mchan->desc->vd.tx.cookie == cookie) {
struct mdc_hw_list_desc *ldesc;
u32 val1, val2, done, processed, residue;
int i, cmds;
mdesc = mchan->desc;
/*
* Determine the number of commands that haven't been
* processed (handled by the IRQ handler) yet.
*/
do {
val1 = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED) &
~MDC_CMDS_PROCESSED_INT_ACTIVE;
residue = mdc_chan_readl(mchan,
MDC_ACTIVE_TRANSFER_SIZE);
val2 = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED) &
~MDC_CMDS_PROCESSED_INT_ACTIVE;
} while (val1 != val2);
done = (val1 >> MDC_CMDS_PROCESSED_CMDS_DONE_SHIFT) &
MDC_CMDS_PROCESSED_CMDS_DONE_MASK;
processed = (val1 >> MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT) &
MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK;
cmds = (done - processed) %
(MDC_CMDS_PROCESSED_CMDS_DONE_MASK + 1);
/*
* If the command loaded event hasn't been processed yet, then
* the difference above includes an extra command.
*/
if (!mdesc->cmd_loaded)
cmds--;
else
cmds += mdesc->list_cmds_done;
bytes = mdesc->list_xfer_size;
ldesc = mdesc->list;
for (i = 0; i < cmds; i++) {
bytes -= ldesc->xfer_size + 1;
ldesc = ldesc->next_desc;
}
if (ldesc) {
if (residue != MDC_TRANSFER_SIZE_MASK)
bytes -= ldesc->xfer_size - residue;
else
bytes -= ldesc->xfer_size + 1;
}
}
spin_unlock_irqrestore(&mchan->vc.lock, flags);
dma_set_residue(txstate, bytes);
return ret;
}
static unsigned int mdc_get_new_events(struct mdc_chan *mchan)
{
u32 val, processed, done1, done2;
unsigned int ret;
val = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED);
processed = (val >> MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT) &
MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK;
/*
* CMDS_DONE may have incremented between reading CMDS_PROCESSED
* and clearing INT_ACTIVE. Re-read CMDS_PROCESSED to ensure we
* didn't miss a command completion.
*/
do {
val = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED);
done1 = (val >> MDC_CMDS_PROCESSED_CMDS_DONE_SHIFT) &
MDC_CMDS_PROCESSED_CMDS_DONE_MASK;
val &= ~((MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK <<
MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT) |
MDC_CMDS_PROCESSED_INT_ACTIVE);
val |= done1 << MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT;
mdc_chan_writel(mchan, val, MDC_CMDS_PROCESSED);
val = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED);
done2 = (val >> MDC_CMDS_PROCESSED_CMDS_DONE_SHIFT) &
MDC_CMDS_PROCESSED_CMDS_DONE_MASK;
} while (done1 != done2);
if (done1 >= processed)
ret = done1 - processed;
else
ret = ((MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK + 1) -
processed) + done1;
return ret;
}
static int mdc_terminate_all(struct dma_chan *chan)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&mchan->vc.lock, flags);
mdc_chan_writel(mchan, MDC_CONTROL_AND_STATUS_CANCEL,
MDC_CONTROL_AND_STATUS);
if (mchan->desc) {
vchan_terminate_vdesc(&mchan->desc->vd);
mchan->desc = NULL;
}
vchan_get_all_descriptors(&mchan->vc, &head);
mdc_get_new_events(mchan);
spin_unlock_irqrestore(&mchan->vc.lock, flags);
vchan_dma_desc_free_list(&mchan->vc, &head);
return 0;
}
static void mdc_synchronize(struct dma_chan *chan)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
vchan_synchronize(&mchan->vc);
}
static int mdc_slave_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
unsigned long flags;
spin_lock_irqsave(&mchan->vc.lock, flags);
mchan->config = *config;
spin_unlock_irqrestore(&mchan->vc.lock, flags);
return 0;
}
static int mdc_alloc_chan_resources(struct dma_chan *chan)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
struct device *dev = mdma2dev(mchan->mdma);
return pm_runtime_get_sync(dev);
}
static void mdc_free_chan_resources(struct dma_chan *chan)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
struct mdc_dma *mdma = mchan->mdma;
struct device *dev = mdma2dev(mdma);
mdc_terminate_all(chan);
mdma->soc->disable_chan(mchan);
pm_runtime_put(dev);
}
static irqreturn_t mdc_chan_irq(int irq, void *dev_id)
{
struct mdc_chan *mchan = (struct mdc_chan *)dev_id;
struct mdc_tx_desc *mdesc;
unsigned int i, new_events;
spin_lock(&mchan->vc.lock);
dev_dbg(mdma2dev(mchan->mdma), "IRQ on channel %d\n", mchan->chan_nr);
new_events = mdc_get_new_events(mchan);
if (!new_events)
goto out;
mdesc = mchan->desc;
if (!mdesc) {
dev_warn(mdma2dev(mchan->mdma),
"IRQ with no active descriptor on channel %d\n",
mchan->chan_nr);
goto out;
}
for (i = 0; i < new_events; i++) {
/*
* The first interrupt in a transfer indicates that the
* command list has been loaded, not that a command has
* been completed.
*/
if (!mdesc->cmd_loaded) {
mdesc->cmd_loaded = true;
continue;
}
mdesc->list_cmds_done++;
if (mdesc->cyclic) {
mdesc->list_cmds_done %= mdesc->list_len;
if (mdesc->list_cmds_done % mdesc->list_period_len == 0)
vchan_cyclic_callback(&mdesc->vd);
} else if (mdesc->list_cmds_done == mdesc->list_len) {
mchan->desc = NULL;
vchan_cookie_complete(&mdesc->vd);
mdc_issue_desc(mchan);
break;
}
}
out:
spin_unlock(&mchan->vc.lock);
return IRQ_HANDLED;
}
static struct dma_chan *mdc_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct mdc_dma *mdma = ofdma->of_dma_data;
struct dma_chan *chan;
if (dma_spec->args_count != 3)
return NULL;
list_for_each_entry(chan, &mdma->dma_dev.channels, device_node) {
struct mdc_chan *mchan = to_mdc_chan(chan);
if (!(dma_spec->args[1] & BIT(mchan->chan_nr)))
continue;
if (dma_get_slave_channel(chan)) {
mchan->periph = dma_spec->args[0];
mchan->thread = dma_spec->args[2];
return chan;
}
}
return NULL;
}
#define PISTACHIO_CR_PERIPH_DMA_ROUTE(ch) (0x120 + 0x4 * ((ch) / 4))
#define PISTACHIO_CR_PERIPH_DMA_ROUTE_SHIFT(ch) (8 * ((ch) % 4))
#define PISTACHIO_CR_PERIPH_DMA_ROUTE_MASK 0x3f
static void pistachio_mdc_enable_chan(struct mdc_chan *mchan)
{
struct mdc_dma *mdma = mchan->mdma;
regmap_update_bits(mdma->periph_regs,
PISTACHIO_CR_PERIPH_DMA_ROUTE(mchan->chan_nr),
PISTACHIO_CR_PERIPH_DMA_ROUTE_MASK <<
PISTACHIO_CR_PERIPH_DMA_ROUTE_SHIFT(mchan->chan_nr),
mchan->periph <<
PISTACHIO_CR_PERIPH_DMA_ROUTE_SHIFT(mchan->chan_nr));
}
static void pistachio_mdc_disable_chan(struct mdc_chan *mchan)
{
struct mdc_dma *mdma = mchan->mdma;
regmap_update_bits(mdma->periph_regs,
PISTACHIO_CR_PERIPH_DMA_ROUTE(mchan->chan_nr),
PISTACHIO_CR_PERIPH_DMA_ROUTE_MASK <<
PISTACHIO_CR_PERIPH_DMA_ROUTE_SHIFT(mchan->chan_nr),
0);
}
static const struct mdc_dma_soc_data pistachio_mdc_data = {
.enable_chan = pistachio_mdc_enable_chan,
.disable_chan = pistachio_mdc_disable_chan,
};
static const struct of_device_id mdc_dma_of_match[] = {
{ .compatible = "img,pistachio-mdc-dma", .data = &pistachio_mdc_data, },
{ },
};
MODULE_DEVICE_TABLE(of, mdc_dma_of_match);
static int img_mdc_runtime_suspend(struct device *dev)
{
struct mdc_dma *mdma = dev_get_drvdata(dev);
clk_disable_unprepare(mdma->clk);
return 0;
}
static int img_mdc_runtime_resume(struct device *dev)
{
struct mdc_dma *mdma = dev_get_drvdata(dev);
return clk_prepare_enable(mdma->clk);
}
static int mdc_dma_probe(struct platform_device *pdev)
{
struct mdc_dma *mdma;
unsigned int i;
u32 val;
int ret;
mdma = devm_kzalloc(&pdev->dev, sizeof(*mdma), GFP_KERNEL);
if (!mdma)
return -ENOMEM;
platform_set_drvdata(pdev, mdma);
mdma->soc = of_device_get_match_data(&pdev->dev);
mdma->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mdma->regs))
return PTR_ERR(mdma->regs);
mdma->periph_regs = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
"img,cr-periph");
if (IS_ERR(mdma->periph_regs))
return PTR_ERR(mdma->periph_regs);
mdma->clk = devm_clk_get(&pdev->dev, "sys");
if (IS_ERR(mdma->clk))
return PTR_ERR(mdma->clk);
dma_cap_zero(mdma->dma_dev.cap_mask);
dma_cap_set(DMA_SLAVE, mdma->dma_dev.cap_mask);
dma_cap_set(DMA_PRIVATE, mdma->dma_dev.cap_mask);
dma_cap_set(DMA_CYCLIC, mdma->dma_dev.cap_mask);
dma_cap_set(DMA_MEMCPY, mdma->dma_dev.cap_mask);
val = mdc_readl(mdma, MDC_GLOBAL_CONFIG_A);
mdma->nr_channels = (val >> MDC_GLOBAL_CONFIG_A_DMA_CONTEXTS_SHIFT) &
MDC_GLOBAL_CONFIG_A_DMA_CONTEXTS_MASK;
mdma->nr_threads =
1 << ((val >> MDC_GLOBAL_CONFIG_A_THREAD_ID_WIDTH_SHIFT) &
MDC_GLOBAL_CONFIG_A_THREAD_ID_WIDTH_MASK);
mdma->bus_width =
(1 << ((val >> MDC_GLOBAL_CONFIG_A_SYS_DAT_WIDTH_SHIFT) &
MDC_GLOBAL_CONFIG_A_SYS_DAT_WIDTH_MASK)) / 8;
/*
* Although transfer sizes of up to MDC_TRANSFER_SIZE_MASK + 1 bytes
* are supported, this makes it possible for the value reported in
* MDC_ACTIVE_TRANSFER_SIZE to be ambiguous - an active transfer size
* of MDC_TRANSFER_SIZE_MASK may indicate either that 0 bytes or
* MDC_TRANSFER_SIZE_MASK + 1 bytes are remaining. To eliminate this
* ambiguity, restrict transfer sizes to one bus-width less than the
* actual maximum.
*/
mdma->max_xfer_size = MDC_TRANSFER_SIZE_MASK + 1 - mdma->bus_width;
of_property_read_u32(pdev->dev.of_node, "dma-channels",
&mdma->nr_channels);
ret = of_property_read_u32(pdev->dev.of_node,
"img,max-burst-multiplier",
&mdma->max_burst_mult);
if (ret)
return ret;
mdma->dma_dev.dev = &pdev->dev;
mdma->dma_dev.device_prep_slave_sg = mdc_prep_slave_sg;
mdma->dma_dev.device_prep_dma_cyclic = mdc_prep_dma_cyclic;
mdma->dma_dev.device_prep_dma_memcpy = mdc_prep_dma_memcpy;
mdma->dma_dev.device_alloc_chan_resources = mdc_alloc_chan_resources;
mdma->dma_dev.device_free_chan_resources = mdc_free_chan_resources;
mdma->dma_dev.device_tx_status = mdc_tx_status;
mdma->dma_dev.device_issue_pending = mdc_issue_pending;
mdma->dma_dev.device_terminate_all = mdc_terminate_all;
mdma->dma_dev.device_synchronize = mdc_synchronize;
mdma->dma_dev.device_config = mdc_slave_config;
mdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
mdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
for (i = 1; i <= mdma->bus_width; i <<= 1) {
mdma->dma_dev.src_addr_widths |= BIT(i);
mdma->dma_dev.dst_addr_widths |= BIT(i);
}
INIT_LIST_HEAD(&mdma->dma_dev.channels);
for (i = 0; i < mdma->nr_channels; i++) {
struct mdc_chan *mchan = &mdma->channels[i];
mchan->mdma = mdma;
mchan->chan_nr = i;
mchan->irq = platform_get_irq(pdev, i);
if (mchan->irq < 0)
return mchan->irq;
ret = devm_request_irq(&pdev->dev, mchan->irq, mdc_chan_irq,
IRQ_TYPE_LEVEL_HIGH,
dev_name(&pdev->dev), mchan);
if (ret < 0)
return ret;
mchan->vc.desc_free = mdc_desc_free;
vchan_init(&mchan->vc, &mdma->dma_dev);
}
mdma->desc_pool = dmam_pool_create(dev_name(&pdev->dev), &pdev->dev,
sizeof(struct mdc_hw_list_desc),
4, 0);
if (!mdma->desc_pool)
return -ENOMEM;
pm_runtime_enable(&pdev->dev);
if (!pm_runtime_enabled(&pdev->dev)) {
ret = img_mdc_runtime_resume(&pdev->dev);
if (ret)
return ret;
}
ret = dma_async_device_register(&mdma->dma_dev);
if (ret)
goto suspend;
ret = of_dma_controller_register(pdev->dev.of_node, mdc_of_xlate, mdma);
if (ret)
goto unregister;
dev_info(&pdev->dev, "MDC with %u channels and %u threads\n",
mdma->nr_channels, mdma->nr_threads);
return 0;
unregister:
dma_async_device_unregister(&mdma->dma_dev);
suspend:
if (!pm_runtime_enabled(&pdev->dev))
img_mdc_runtime_suspend(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return ret;
}
static int mdc_dma_remove(struct platform_device *pdev)
{
struct mdc_dma *mdma = platform_get_drvdata(pdev);
struct mdc_chan *mchan, *next;
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&mdma->dma_dev);
list_for_each_entry_safe(mchan, next, &mdma->dma_dev.channels,
vc.chan.device_node) {
list_del(&mchan->vc.chan.device_node);
devm_free_irq(&pdev->dev, mchan->irq, mchan);
tasklet_kill(&mchan->vc.task);
}
pm_runtime_disable(&pdev->dev);
if (!pm_runtime_status_suspended(&pdev->dev))
img_mdc_runtime_suspend(&pdev->dev);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int img_mdc_suspend_late(struct device *dev)
{
struct mdc_dma *mdma = dev_get_drvdata(dev);
int i;
/* Check that all channels are idle */
for (i = 0; i < mdma->nr_channels; i++) {
struct mdc_chan *mchan = &mdma->channels[i];
if (unlikely(mchan->desc))
return -EBUSY;
}
return pm_runtime_force_suspend(dev);
}
static int img_mdc_resume_early(struct device *dev)
{
return pm_runtime_force_resume(dev);
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops img_mdc_pm_ops = {
SET_RUNTIME_PM_OPS(img_mdc_runtime_suspend,
img_mdc_runtime_resume, NULL)
SET_LATE_SYSTEM_SLEEP_PM_OPS(img_mdc_suspend_late,
img_mdc_resume_early)
};
static struct platform_driver mdc_dma_driver = {
.driver = {
.name = "img-mdc-dma",
.pm = &img_mdc_pm_ops,
.of_match_table = of_match_ptr(mdc_dma_of_match),
},
.probe = mdc_dma_probe,
.remove = mdc_dma_remove,
};
module_platform_driver(mdc_dma_driver);
MODULE_DESCRIPTION("IMG Multi-threaded DMA Controller (MDC) driver");
MODULE_AUTHOR("Andrew Bresticker <[email protected]>");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/img-mdc-dma.c |
// SPDX-License-Identifier: GPL-2.0+
//
// drivers/dma/imx-dma.c
//
// This file contains a driver for the Freescale i.MX DMA engine
// found on i.MX1/21/27
//
// Copyright 2010 Sascha Hauer, Pengutronix <[email protected]>
// Copyright 2012 Javier Martin, Vista Silicon <[email protected]>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <asm/irq.h>
#include <linux/dma/imx-dma.h>
#include "dmaengine.h"
#define IMXDMA_MAX_CHAN_DESCRIPTORS 16
#define IMX_DMA_CHANNELS 16
#define IMX_DMA_2D_SLOTS 2
#define IMX_DMA_2D_SLOT_A 0
#define IMX_DMA_2D_SLOT_B 1
#define IMX_DMA_LENGTH_LOOP ((unsigned int)-1)
#define IMX_DMA_MEMSIZE_32 (0 << 4)
#define IMX_DMA_MEMSIZE_8 (1 << 4)
#define IMX_DMA_MEMSIZE_16 (2 << 4)
#define IMX_DMA_TYPE_LINEAR (0 << 10)
#define IMX_DMA_TYPE_2D (1 << 10)
#define IMX_DMA_TYPE_FIFO (2 << 10)
#define IMX_DMA_ERR_BURST (1 << 0)
#define IMX_DMA_ERR_REQUEST (1 << 1)
#define IMX_DMA_ERR_TRANSFER (1 << 2)
#define IMX_DMA_ERR_BUFFER (1 << 3)
#define IMX_DMA_ERR_TIMEOUT (1 << 4)
#define DMA_DCR 0x00 /* Control Register */
#define DMA_DISR 0x04 /* Interrupt status Register */
#define DMA_DIMR 0x08 /* Interrupt mask Register */
#define DMA_DBTOSR 0x0c /* Burst timeout status Register */
#define DMA_DRTOSR 0x10 /* Request timeout Register */
#define DMA_DSESR 0x14 /* Transfer Error Status Register */
#define DMA_DBOSR 0x18 /* Buffer overflow status Register */
#define DMA_DBTOCR 0x1c /* Burst timeout control Register */
#define DMA_WSRA 0x40 /* W-Size Register A */
#define DMA_XSRA 0x44 /* X-Size Register A */
#define DMA_YSRA 0x48 /* Y-Size Register A */
#define DMA_WSRB 0x4c /* W-Size Register B */
#define DMA_XSRB 0x50 /* X-Size Register B */
#define DMA_YSRB 0x54 /* Y-Size Register B */
#define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */
#define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */
#define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */
#define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */
#define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */
#define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */
#define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */
#define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */
#define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */
#define DCR_DRST (1<<1)
#define DCR_DEN (1<<0)
#define DBTOCR_EN (1<<15)
#define DBTOCR_CNT(x) ((x) & 0x7fff)
#define CNTR_CNT(x) ((x) & 0xffffff)
#define CCR_ACRPT (1<<14)
#define CCR_DMOD_LINEAR (0x0 << 12)
#define CCR_DMOD_2D (0x1 << 12)
#define CCR_DMOD_FIFO (0x2 << 12)
#define CCR_DMOD_EOBFIFO (0x3 << 12)
#define CCR_SMOD_LINEAR (0x0 << 10)
#define CCR_SMOD_2D (0x1 << 10)
#define CCR_SMOD_FIFO (0x2 << 10)
#define CCR_SMOD_EOBFIFO (0x3 << 10)
#define CCR_MDIR_DEC (1<<9)
#define CCR_MSEL_B (1<<8)
#define CCR_DSIZ_32 (0x0 << 6)
#define CCR_DSIZ_8 (0x1 << 6)
#define CCR_DSIZ_16 (0x2 << 6)
#define CCR_SSIZ_32 (0x0 << 4)
#define CCR_SSIZ_8 (0x1 << 4)
#define CCR_SSIZ_16 (0x2 << 4)
#define CCR_REN (1<<3)
#define CCR_RPT (1<<2)
#define CCR_FRC (1<<1)
#define CCR_CEN (1<<0)
#define RTOR_EN (1<<15)
#define RTOR_CLK (1<<14)
#define RTOR_PSC (1<<13)
enum imxdma_prep_type {
IMXDMA_DESC_MEMCPY,
IMXDMA_DESC_INTERLEAVED,
IMXDMA_DESC_SLAVE_SG,
IMXDMA_DESC_CYCLIC,
};
struct imx_dma_2d_config {
u16 xsr;
u16 ysr;
u16 wsr;
int count;
};
struct imxdma_desc {
struct list_head node;
struct dma_async_tx_descriptor desc;
enum dma_status status;
dma_addr_t src;
dma_addr_t dest;
size_t len;
enum dma_transfer_direction direction;
enum imxdma_prep_type type;
/* For memcpy and interleaved */
unsigned int config_port;
unsigned int config_mem;
/* For interleaved transfers */
unsigned int x;
unsigned int y;
unsigned int w;
/* For slave sg and cyclic */
struct scatterlist *sg;
unsigned int sgcount;
};
struct imxdma_channel {
int hw_chaining;
struct timer_list watchdog;
struct imxdma_engine *imxdma;
unsigned int channel;
struct tasklet_struct dma_tasklet;
struct list_head ld_free;
struct list_head ld_queue;
struct list_head ld_active;
int descs_allocated;
enum dma_slave_buswidth word_size;
dma_addr_t per_address;
u32 watermark_level;
struct dma_chan chan;
struct dma_async_tx_descriptor desc;
enum dma_status status;
int dma_request;
struct scatterlist *sg_list;
u32 ccr_from_device;
u32 ccr_to_device;
bool enabled_2d;
int slot_2d;
unsigned int irq;
struct dma_slave_config config;
};
enum imx_dma_type {
IMX1_DMA,
IMX21_DMA,
IMX27_DMA,
};
struct imxdma_engine {
struct device *dev;
struct dma_device dma_device;
void __iomem *base;
struct clk *dma_ahb;
struct clk *dma_ipg;
spinlock_t lock;
struct imx_dma_2d_config slots_2d[IMX_DMA_2D_SLOTS];
struct imxdma_channel channel[IMX_DMA_CHANNELS];
enum imx_dma_type devtype;
unsigned int irq;
unsigned int irq_err;
};
struct imxdma_filter_data {
struct imxdma_engine *imxdma;
int request;
};
static const struct of_device_id imx_dma_of_dev_id[] = {
{
.compatible = "fsl,imx1-dma", .data = (const void *)IMX1_DMA,
}, {
.compatible = "fsl,imx21-dma", .data = (const void *)IMX21_DMA,
}, {
.compatible = "fsl,imx27-dma", .data = (const void *)IMX27_DMA,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id);
static inline int is_imx1_dma(struct imxdma_engine *imxdma)
{
return imxdma->devtype == IMX1_DMA;
}
static inline int is_imx27_dma(struct imxdma_engine *imxdma)
{
return imxdma->devtype == IMX27_DMA;
}
static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
{
return container_of(chan, struct imxdma_channel, chan);
}
static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac)
{
struct imxdma_desc *desc;
if (!list_empty(&imxdmac->ld_active)) {
desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc,
node);
if (desc->type == IMXDMA_DESC_CYCLIC)
return true;
}
return false;
}
static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val,
unsigned offset)
{
__raw_writel(val, imxdma->base + offset);
}
static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset)
{
return __raw_readl(imxdma->base + offset);
}
static int imxdma_hw_chain(struct imxdma_channel *imxdmac)
{
struct imxdma_engine *imxdma = imxdmac->imxdma;
if (is_imx27_dma(imxdma))
return imxdmac->hw_chaining;
else
return 0;
}
/*
* imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
*/
static inline void imxdma_sg_next(struct imxdma_desc *d)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct scatterlist *sg = d->sg;
size_t now;
now = min_t(size_t, d->len, sg_dma_len(sg));
if (d->len != IMX_DMA_LENGTH_LOOP)
d->len -= now;
if (d->direction == DMA_DEV_TO_MEM)
imx_dmav1_writel(imxdma, sg->dma_address,
DMA_DAR(imxdmac->channel));
else
imx_dmav1_writel(imxdma, sg->dma_address,
DMA_SAR(imxdmac->channel));
imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel));
dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, "
"size 0x%08x\n", __func__, imxdmac->channel,
imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)),
imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)),
imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel)));
}
static void imxdma_enable_hw(struct imxdma_desc *d)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
int channel = imxdmac->channel;
unsigned long flags;
dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
local_irq_save(flags);
imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) &
~(1 << channel), DMA_DIMR);
imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) |
CCR_CEN | CCR_ACRPT, DMA_CCR(channel));
if (!is_imx1_dma(imxdma) &&
d->sg && imxdma_hw_chain(imxdmac)) {
d->sg = sg_next(d->sg);
if (d->sg) {
u32 tmp;
imxdma_sg_next(d);
tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel));
imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT,
DMA_CCR(channel));
}
}
local_irq_restore(flags);
}
static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
{
struct imxdma_engine *imxdma = imxdmac->imxdma;
int channel = imxdmac->channel;
unsigned long flags;
dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
if (imxdma_hw_chain(imxdmac))
del_timer(&imxdmac->watchdog);
local_irq_save(flags);
imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) |
(1 << channel), DMA_DIMR);
imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) &
~CCR_CEN, DMA_CCR(channel));
imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
local_irq_restore(flags);
}
static void imxdma_watchdog(struct timer_list *t)
{
struct imxdma_channel *imxdmac = from_timer(imxdmac, t, watchdog);
struct imxdma_engine *imxdma = imxdmac->imxdma;
int channel = imxdmac->channel;
imx_dmav1_writel(imxdma, 0, DMA_CCR(channel));
/* Tasklet watchdog error handler */
tasklet_schedule(&imxdmac->dma_tasklet);
dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n",
imxdmac->channel);
}
static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
{
struct imxdma_engine *imxdma = dev_id;
unsigned int err_mask;
int i, disr;
int errcode;
disr = imx_dmav1_readl(imxdma, DMA_DISR);
err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) |
imx_dmav1_readl(imxdma, DMA_DRTOSR) |
imx_dmav1_readl(imxdma, DMA_DSESR) |
imx_dmav1_readl(imxdma, DMA_DBOSR);
if (!err_mask)
return IRQ_HANDLED;
imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR);
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
if (!(err_mask & (1 << i)))
continue;
errcode = 0;
if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) {
imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR);
errcode |= IMX_DMA_ERR_BURST;
}
if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) {
imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR);
errcode |= IMX_DMA_ERR_REQUEST;
}
if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) {
imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR);
errcode |= IMX_DMA_ERR_TRANSFER;
}
if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) {
imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR);
errcode |= IMX_DMA_ERR_BUFFER;
}
/* Tasklet error handler */
tasklet_schedule(&imxdma->channel[i].dma_tasklet);
dev_warn(imxdma->dev,
"DMA timeout on channel %d -%s%s%s%s\n", i,
errcode & IMX_DMA_ERR_BURST ? " burst" : "",
errcode & IMX_DMA_ERR_REQUEST ? " request" : "",
errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
errcode & IMX_DMA_ERR_BUFFER ? " buffer" : "");
}
return IRQ_HANDLED;
}
static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
{
struct imxdma_engine *imxdma = imxdmac->imxdma;
int chno = imxdmac->channel;
struct imxdma_desc *desc;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
if (list_empty(&imxdmac->ld_active)) {
spin_unlock_irqrestore(&imxdma->lock, flags);
goto out;
}
desc = list_first_entry(&imxdmac->ld_active,
struct imxdma_desc,
node);
spin_unlock_irqrestore(&imxdma->lock, flags);
if (desc->sg) {
u32 tmp;
desc->sg = sg_next(desc->sg);
if (desc->sg) {
imxdma_sg_next(desc);
tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno));
if (imxdma_hw_chain(imxdmac)) {
/* FIXME: The timeout should probably be
* configurable
*/
mod_timer(&imxdmac->watchdog,
jiffies + msecs_to_jiffies(500));
tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
} else {
imx_dmav1_writel(imxdma, tmp & ~CCR_CEN,
DMA_CCR(chno));
tmp |= CCR_CEN;
}
imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
if (imxdma_chan_is_doing_cyclic(imxdmac))
/* Tasklet progression */
tasklet_schedule(&imxdmac->dma_tasklet);
return;
}
if (imxdma_hw_chain(imxdmac)) {
del_timer(&imxdmac->watchdog);
return;
}
}
out:
imx_dmav1_writel(imxdma, 0, DMA_CCR(chno));
/* Tasklet irq */
tasklet_schedule(&imxdmac->dma_tasklet);
}
static irqreturn_t dma_irq_handler(int irq, void *dev_id)
{
struct imxdma_engine *imxdma = dev_id;
int i, disr;
if (!is_imx1_dma(imxdma))
imxdma_err_handler(irq, dev_id);
disr = imx_dmav1_readl(imxdma, DMA_DISR);
dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr);
imx_dmav1_writel(imxdma, disr, DMA_DISR);
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
if (disr & (1 << i))
dma_irq_handle_channel(&imxdma->channel[i]);
}
return IRQ_HANDLED;
}
static int imxdma_xfer_desc(struct imxdma_desc *d)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
int slot = -1;
int i;
/* Configure and enable */
switch (d->type) {
case IMXDMA_DESC_INTERLEAVED:
/* Try to get a free 2D slot */
for (i = 0; i < IMX_DMA_2D_SLOTS; i++) {
if ((imxdma->slots_2d[i].count > 0) &&
((imxdma->slots_2d[i].xsr != d->x) ||
(imxdma->slots_2d[i].ysr != d->y) ||
(imxdma->slots_2d[i].wsr != d->w)))
continue;
slot = i;
break;
}
if (slot < 0)
return -EBUSY;
imxdma->slots_2d[slot].xsr = d->x;
imxdma->slots_2d[slot].ysr = d->y;
imxdma->slots_2d[slot].wsr = d->w;
imxdma->slots_2d[slot].count++;
imxdmac->slot_2d = slot;
imxdmac->enabled_2d = true;
if (slot == IMX_DMA_2D_SLOT_A) {
d->config_mem &= ~CCR_MSEL_B;
d->config_port &= ~CCR_MSEL_B;
imx_dmav1_writel(imxdma, d->x, DMA_XSRA);
imx_dmav1_writel(imxdma, d->y, DMA_YSRA);
imx_dmav1_writel(imxdma, d->w, DMA_WSRA);
} else {
d->config_mem |= CCR_MSEL_B;
d->config_port |= CCR_MSEL_B;
imx_dmav1_writel(imxdma, d->x, DMA_XSRB);
imx_dmav1_writel(imxdma, d->y, DMA_YSRB);
imx_dmav1_writel(imxdma, d->w, DMA_WSRB);
}
/*
* We fall-through here intentionally, since a 2D transfer is
* similar to MEMCPY just adding the 2D slot configuration.
*/
fallthrough;
case IMXDMA_DESC_MEMCPY:
imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel));
imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel));
imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2),
DMA_CCR(imxdmac->channel));
imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel));
dev_dbg(imxdma->dev,
"%s channel: %d dest=0x%08llx src=0x%08llx dma_length=%zu\n",
__func__, imxdmac->channel,
(unsigned long long)d->dest,
(unsigned long long)d->src, d->len);
break;
/* Cyclic transfer is the same as slave_sg with special sg configuration. */
case IMXDMA_DESC_CYCLIC:
case IMXDMA_DESC_SLAVE_SG:
if (d->direction == DMA_DEV_TO_MEM) {
imx_dmav1_writel(imxdma, imxdmac->per_address,
DMA_SAR(imxdmac->channel));
imx_dmav1_writel(imxdma, imxdmac->ccr_from_device,
DMA_CCR(imxdmac->channel));
dev_dbg(imxdma->dev,
"%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (dev2mem)\n",
__func__, imxdmac->channel,
d->sg, d->sgcount, d->len,
(unsigned long long)imxdmac->per_address);
} else if (d->direction == DMA_MEM_TO_DEV) {
imx_dmav1_writel(imxdma, imxdmac->per_address,
DMA_DAR(imxdmac->channel));
imx_dmav1_writel(imxdma, imxdmac->ccr_to_device,
DMA_CCR(imxdmac->channel));
dev_dbg(imxdma->dev,
"%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (mem2dev)\n",
__func__, imxdmac->channel,
d->sg, d->sgcount, d->len,
(unsigned long long)imxdmac->per_address);
} else {
dev_err(imxdma->dev, "%s channel: %d bad dma mode\n",
__func__, imxdmac->channel);
return -EINVAL;
}
imxdma_sg_next(d);
break;
default:
return -EINVAL;
}
imxdma_enable_hw(d);
return 0;
}
static void imxdma_tasklet(struct tasklet_struct *t)
{
struct imxdma_channel *imxdmac = from_tasklet(imxdmac, t, dma_tasklet);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc, *next_desc;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
if (list_empty(&imxdmac->ld_active)) {
/* Someone might have called terminate all */
spin_unlock_irqrestore(&imxdma->lock, flags);
return;
}
desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
/* If we are dealing with a cyclic descriptor, keep it on ld_active
* and dont mark the descriptor as complete.
* Only in non-cyclic cases it would be marked as complete
*/
if (imxdma_chan_is_doing_cyclic(imxdmac))
goto out;
else
dma_cookie_complete(&desc->desc);
/* Free 2D slot if it was an interleaved transfer */
if (imxdmac->enabled_2d) {
imxdma->slots_2d[imxdmac->slot_2d].count--;
imxdmac->enabled_2d = false;
}
list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free);
if (!list_empty(&imxdmac->ld_queue)) {
next_desc = list_first_entry(&imxdmac->ld_queue,
struct imxdma_desc, node);
list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active);
if (imxdma_xfer_desc(next_desc) < 0)
dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n",
__func__, imxdmac->channel);
}
out:
spin_unlock_irqrestore(&imxdma->lock, flags);
dmaengine_desc_get_callback_invoke(&desc->desc, NULL);
}
static int imxdma_terminate_all(struct dma_chan *chan)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
unsigned long flags;
imxdma_disable_hw(imxdmac);
spin_lock_irqsave(&imxdma->lock, flags);
list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
spin_unlock_irqrestore(&imxdma->lock, flags);
return 0;
}
static int imxdma_config_write(struct dma_chan *chan,
struct dma_slave_config *dmaengine_cfg,
enum dma_transfer_direction direction)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
unsigned int mode = 0;
if (direction == DMA_DEV_TO_MEM) {
imxdmac->per_address = dmaengine_cfg->src_addr;
imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
imxdmac->word_size = dmaengine_cfg->src_addr_width;
} else {
imxdmac->per_address = dmaengine_cfg->dst_addr;
imxdmac->watermark_level = dmaengine_cfg->dst_maxburst;
imxdmac->word_size = dmaengine_cfg->dst_addr_width;
}
switch (imxdmac->word_size) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
mode = IMX_DMA_MEMSIZE_8;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
mode = IMX_DMA_MEMSIZE_16;
break;
default:
case DMA_SLAVE_BUSWIDTH_4_BYTES:
mode = IMX_DMA_MEMSIZE_32;
break;
}
imxdmac->hw_chaining = 0;
imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) |
((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) |
CCR_REN;
imxdmac->ccr_to_device =
(IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) |
((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN;
imx_dmav1_writel(imxdma, imxdmac->dma_request,
DMA_RSSR(imxdmac->channel));
/* Set burst length */
imx_dmav1_writel(imxdma, imxdmac->watermark_level *
imxdmac->word_size, DMA_BLR(imxdmac->channel));
return 0;
}
static int imxdma_config(struct dma_chan *chan,
struct dma_slave_config *dmaengine_cfg)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
memcpy(&imxdmac->config, dmaengine_cfg, sizeof(*dmaengine_cfg));
return 0;
}
static enum dma_status imxdma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(chan, cookie, txstate);
}
static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
dma_cookie_t cookie;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue);
cookie = dma_cookie_assign(tx);
spin_unlock_irqrestore(&imxdma->lock, flags);
return cookie;
}
static int imxdma_alloc_chan_resources(struct dma_chan *chan)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imx_dma_data *data = chan->private;
if (data != NULL)
imxdmac->dma_request = data->dma_request;
while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) {
struct imxdma_desc *desc;
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
break;
dma_async_tx_descriptor_init(&desc->desc, chan);
desc->desc.tx_submit = imxdma_tx_submit;
/* txd.flags will be overwritten in prep funcs */
desc->desc.flags = DMA_CTRL_ACK;
desc->status = DMA_COMPLETE;
list_add_tail(&desc->node, &imxdmac->ld_free);
imxdmac->descs_allocated++;
}
if (!imxdmac->descs_allocated)
return -ENOMEM;
return imxdmac->descs_allocated;
}
static void imxdma_free_chan_resources(struct dma_chan *chan)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc, *_desc;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
imxdma_disable_hw(imxdmac);
list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
spin_unlock_irqrestore(&imxdma->lock, flags);
list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) {
kfree(desc);
imxdmac->descs_allocated--;
}
INIT_LIST_HEAD(&imxdmac->ld_free);
kfree(imxdmac->sg_list);
imxdmac->sg_list = NULL;
}
static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct scatterlist *sg;
int i, dma_length = 0;
struct imxdma_desc *desc;
if (list_empty(&imxdmac->ld_free) ||
imxdma_chan_is_doing_cyclic(imxdmac))
return NULL;
desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
for_each_sg(sgl, sg, sg_len, i) {
dma_length += sg_dma_len(sg);
}
imxdma_config_write(chan, &imxdmac->config, direction);
switch (imxdmac->word_size) {
case DMA_SLAVE_BUSWIDTH_4_BYTES:
if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_1_BYTE:
break;
default:
return NULL;
}
desc->type = IMXDMA_DESC_SLAVE_SG;
desc->sg = sgl;
desc->sgcount = sg_len;
desc->len = dma_length;
desc->direction = direction;
if (direction == DMA_DEV_TO_MEM) {
desc->src = imxdmac->per_address;
} else {
desc->dest = imxdmac->per_address;
}
desc->desc.callback = NULL;
desc->desc.callback_param = NULL;
return &desc->desc;
}
static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc;
int i;
unsigned int periods = buf_len / period_len;
dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n",
__func__, imxdmac->channel, buf_len, period_len);
if (list_empty(&imxdmac->ld_free) ||
imxdma_chan_is_doing_cyclic(imxdmac))
return NULL;
desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
kfree(imxdmac->sg_list);
imxdmac->sg_list = kcalloc(periods + 1,
sizeof(struct scatterlist), GFP_ATOMIC);
if (!imxdmac->sg_list)
return NULL;
sg_init_table(imxdmac->sg_list, periods);
for (i = 0; i < periods; i++) {
sg_assign_page(&imxdmac->sg_list[i], NULL);
imxdmac->sg_list[i].offset = 0;
imxdmac->sg_list[i].dma_address = dma_addr;
sg_dma_len(&imxdmac->sg_list[i]) = period_len;
dma_addr += period_len;
}
/* close the loop */
sg_chain(imxdmac->sg_list, periods + 1, imxdmac->sg_list);
desc->type = IMXDMA_DESC_CYCLIC;
desc->sg = imxdmac->sg_list;
desc->sgcount = periods;
desc->len = IMX_DMA_LENGTH_LOOP;
desc->direction = direction;
if (direction == DMA_DEV_TO_MEM) {
desc->src = imxdmac->per_address;
} else {
desc->dest = imxdmac->per_address;
}
desc->desc.callback = NULL;
desc->desc.callback_param = NULL;
imxdma_config_write(chan, &imxdmac->config, direction);
return &desc->desc;
}
static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest,
dma_addr_t src, size_t len, unsigned long flags)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc;
dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n",
__func__, imxdmac->channel, (unsigned long long)src,
(unsigned long long)dest, len);
if (list_empty(&imxdmac->ld_free) ||
imxdma_chan_is_doing_cyclic(imxdmac))
return NULL;
desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
desc->type = IMXDMA_DESC_MEMCPY;
desc->src = src;
desc->dest = dest;
desc->len = len;
desc->direction = DMA_MEM_TO_MEM;
desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
desc->desc.callback = NULL;
desc->desc.callback_param = NULL;
return &desc->desc;
}
static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved(
struct dma_chan *chan, struct dma_interleaved_template *xt,
unsigned long flags)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc;
dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n"
" src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__,
imxdmac->channel, (unsigned long long)xt->src_start,
(unsigned long long) xt->dst_start,
xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false",
xt->numf, xt->frame_size);
if (list_empty(&imxdmac->ld_free) ||
imxdma_chan_is_doing_cyclic(imxdmac))
return NULL;
if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM)
return NULL;
desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
desc->type = IMXDMA_DESC_INTERLEAVED;
desc->src = xt->src_start;
desc->dest = xt->dst_start;
desc->x = xt->sgl[0].size;
desc->y = xt->numf;
desc->w = xt->sgl[0].icg + desc->x;
desc->len = desc->x * desc->y;
desc->direction = DMA_MEM_TO_MEM;
desc->config_port = IMX_DMA_MEMSIZE_32;
desc->config_mem = IMX_DMA_MEMSIZE_32;
if (xt->src_sgl)
desc->config_mem |= IMX_DMA_TYPE_2D;
if (xt->dst_sgl)
desc->config_port |= IMX_DMA_TYPE_2D;
desc->desc.callback = NULL;
desc->desc.callback_param = NULL;
return &desc->desc;
}
static void imxdma_issue_pending(struct dma_chan *chan)
{
struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
struct imxdma_engine *imxdma = imxdmac->imxdma;
struct imxdma_desc *desc;
unsigned long flags;
spin_lock_irqsave(&imxdma->lock, flags);
if (list_empty(&imxdmac->ld_active) &&
!list_empty(&imxdmac->ld_queue)) {
desc = list_first_entry(&imxdmac->ld_queue,
struct imxdma_desc, node);
if (imxdma_xfer_desc(desc) < 0) {
dev_warn(imxdma->dev,
"%s: channel: %d couldn't issue DMA xfer\n",
__func__, imxdmac->channel);
} else {
list_move_tail(imxdmac->ld_queue.next,
&imxdmac->ld_active);
}
}
spin_unlock_irqrestore(&imxdma->lock, flags);
}
static bool imxdma_filter_fn(struct dma_chan *chan, void *param)
{
struct imxdma_filter_data *fdata = param;
struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan);
if (chan->device->dev != fdata->imxdma->dev)
return false;
imxdma_chan->dma_request = fdata->request;
chan->private = NULL;
return true;
}
static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
int count = dma_spec->args_count;
struct imxdma_engine *imxdma = ofdma->of_dma_data;
struct imxdma_filter_data fdata = {
.imxdma = imxdma,
};
if (count != 1)
return NULL;
fdata.request = dma_spec->args[0];
return dma_request_channel(imxdma->dma_device.cap_mask,
imxdma_filter_fn, &fdata);
}
static int __init imxdma_probe(struct platform_device *pdev)
{
struct imxdma_engine *imxdma;
int ret, i;
int irq, irq_err;
imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL);
if (!imxdma)
return -ENOMEM;
imxdma->dev = &pdev->dev;
imxdma->devtype = (uintptr_t)of_device_get_match_data(&pdev->dev);
imxdma->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(imxdma->base))
return PTR_ERR(imxdma->base);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(imxdma->dma_ipg))
return PTR_ERR(imxdma->dma_ipg);
imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(imxdma->dma_ahb))
return PTR_ERR(imxdma->dma_ahb);
ret = clk_prepare_enable(imxdma->dma_ipg);
if (ret)
return ret;
ret = clk_prepare_enable(imxdma->dma_ahb);
if (ret)
goto disable_dma_ipg_clk;
/* reset DMA module */
imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR);
if (is_imx1_dma(imxdma)) {
ret = devm_request_irq(&pdev->dev, irq,
dma_irq_handler, 0, "DMA", imxdma);
if (ret) {
dev_warn(imxdma->dev, "Can't register IRQ for DMA\n");
goto disable_dma_ahb_clk;
}
imxdma->irq = irq;
irq_err = platform_get_irq(pdev, 1);
if (irq_err < 0) {
ret = irq_err;
goto disable_dma_ahb_clk;
}
ret = devm_request_irq(&pdev->dev, irq_err,
imxdma_err_handler, 0, "DMA", imxdma);
if (ret) {
dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n");
goto disable_dma_ahb_clk;
}
imxdma->irq_err = irq_err;
}
/* enable DMA module */
imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR);
/* clear all interrupts */
imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
/* disable interrupts */
imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
INIT_LIST_HEAD(&imxdma->dma_device.channels);
dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask);
/* Initialize 2D global parameters */
for (i = 0; i < IMX_DMA_2D_SLOTS; i++)
imxdma->slots_2d[i].count = 0;
spin_lock_init(&imxdma->lock);
/* Initialize channel parameters */
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
struct imxdma_channel *imxdmac = &imxdma->channel[i];
if (!is_imx1_dma(imxdma)) {
ret = devm_request_irq(&pdev->dev, irq + i,
dma_irq_handler, 0, "DMA", imxdma);
if (ret) {
dev_warn(imxdma->dev, "Can't register IRQ %d "
"for DMA channel %d\n",
irq + i, i);
goto disable_dma_ahb_clk;
}
imxdmac->irq = irq + i;
timer_setup(&imxdmac->watchdog, imxdma_watchdog, 0);
}
imxdmac->imxdma = imxdma;
INIT_LIST_HEAD(&imxdmac->ld_queue);
INIT_LIST_HEAD(&imxdmac->ld_free);
INIT_LIST_HEAD(&imxdmac->ld_active);
tasklet_setup(&imxdmac->dma_tasklet, imxdma_tasklet);
imxdmac->chan.device = &imxdma->dma_device;
dma_cookie_init(&imxdmac->chan);
imxdmac->channel = i;
/* Add the channel to the DMAC list */
list_add_tail(&imxdmac->chan.device_node,
&imxdma->dma_device.channels);
}
imxdma->dma_device.dev = &pdev->dev;
imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
imxdma->dma_device.device_tx_status = imxdma_tx_status;
imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved;
imxdma->dma_device.device_config = imxdma_config;
imxdma->dma_device.device_terminate_all = imxdma_terminate_all;
imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
platform_set_drvdata(pdev, imxdma);
imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES;
dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
ret = dma_async_device_register(&imxdma->dma_device);
if (ret) {
dev_err(&pdev->dev, "unable to register\n");
goto disable_dma_ahb_clk;
}
if (pdev->dev.of_node) {
ret = of_dma_controller_register(pdev->dev.of_node,
imxdma_xlate, imxdma);
if (ret) {
dev_err(&pdev->dev, "unable to register of_dma_controller\n");
goto err_of_dma_controller;
}
}
return 0;
err_of_dma_controller:
dma_async_device_unregister(&imxdma->dma_device);
disable_dma_ahb_clk:
clk_disable_unprepare(imxdma->dma_ahb);
disable_dma_ipg_clk:
clk_disable_unprepare(imxdma->dma_ipg);
return ret;
}
static void imxdma_free_irq(struct platform_device *pdev, struct imxdma_engine *imxdma)
{
int i;
if (is_imx1_dma(imxdma)) {
disable_irq(imxdma->irq);
disable_irq(imxdma->irq_err);
}
for (i = 0; i < IMX_DMA_CHANNELS; i++) {
struct imxdma_channel *imxdmac = &imxdma->channel[i];
if (!is_imx1_dma(imxdma))
disable_irq(imxdmac->irq);
tasklet_kill(&imxdmac->dma_tasklet);
}
}
static int imxdma_remove(struct platform_device *pdev)
{
struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
imxdma_free_irq(pdev, imxdma);
dma_async_device_unregister(&imxdma->dma_device);
if (pdev->dev.of_node)
of_dma_controller_free(pdev->dev.of_node);
clk_disable_unprepare(imxdma->dma_ipg);
clk_disable_unprepare(imxdma->dma_ahb);
return 0;
}
static struct platform_driver imxdma_driver = {
.driver = {
.name = "imx-dma",
.of_match_table = imx_dma_of_dev_id,
},
.remove = imxdma_remove,
};
static int __init imxdma_module_init(void)
{
return platform_driver_probe(&imxdma_driver, imxdma_probe);
}
subsys_initcall(imxdma_module_init);
MODULE_AUTHOR("Sascha Hauer, Pengutronix <[email protected]>");
MODULE_DESCRIPTION("i.MX dma driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/imx-dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* MOXA ART SoCs DMA Engine support.
*
* Copyright (C) 2013 Jonas Jensen
*
* Jonas Jensen <[email protected]>
*/
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_dma.h>
#include <linux/bitops.h>
#include <asm/cacheflush.h>
#include "dmaengine.h"
#include "virt-dma.h"
#define APB_DMA_MAX_CHANNEL 4
#define REG_OFF_ADDRESS_SOURCE 0
#define REG_OFF_ADDRESS_DEST 4
#define REG_OFF_CYCLES 8
#define REG_OFF_CTRL 12
#define REG_OFF_CHAN_SIZE 16
#define APB_DMA_ENABLE BIT(0)
#define APB_DMA_FIN_INT_STS BIT(1)
#define APB_DMA_FIN_INT_EN BIT(2)
#define APB_DMA_BURST_MODE BIT(3)
#define APB_DMA_ERR_INT_STS BIT(4)
#define APB_DMA_ERR_INT_EN BIT(5)
/*
* Unset: APB
* Set: AHB
*/
#define APB_DMA_SOURCE_SELECT 0x40
#define APB_DMA_DEST_SELECT 0x80
#define APB_DMA_SOURCE 0x100
#define APB_DMA_DEST 0x1000
#define APB_DMA_SOURCE_MASK 0x700
#define APB_DMA_DEST_MASK 0x7000
/*
* 000: No increment
* 001: +1 (Burst=0), +4 (Burst=1)
* 010: +2 (Burst=0), +8 (Burst=1)
* 011: +4 (Burst=0), +16 (Burst=1)
* 101: -1 (Burst=0), -4 (Burst=1)
* 110: -2 (Burst=0), -8 (Burst=1)
* 111: -4 (Burst=0), -16 (Burst=1)
*/
#define APB_DMA_SOURCE_INC_0 0
#define APB_DMA_SOURCE_INC_1_4 0x100
#define APB_DMA_SOURCE_INC_2_8 0x200
#define APB_DMA_SOURCE_INC_4_16 0x300
#define APB_DMA_SOURCE_DEC_1_4 0x500
#define APB_DMA_SOURCE_DEC_2_8 0x600
#define APB_DMA_SOURCE_DEC_4_16 0x700
#define APB_DMA_DEST_INC_0 0
#define APB_DMA_DEST_INC_1_4 0x1000
#define APB_DMA_DEST_INC_2_8 0x2000
#define APB_DMA_DEST_INC_4_16 0x3000
#define APB_DMA_DEST_DEC_1_4 0x5000
#define APB_DMA_DEST_DEC_2_8 0x6000
#define APB_DMA_DEST_DEC_4_16 0x7000
/*
* Request signal select source/destination address for DMA hardware handshake.
*
* The request line number is a property of the DMA controller itself,
* e.g. MMC must always request channels where dma_slave_config->slave_id is 5.
*
* 0: No request / Grant signal
* 1-15: Request / Grant signal
*/
#define APB_DMA_SOURCE_REQ_NO 0x1000000
#define APB_DMA_SOURCE_REQ_NO_MASK 0xf000000
#define APB_DMA_DEST_REQ_NO 0x10000
#define APB_DMA_DEST_REQ_NO_MASK 0xf0000
#define APB_DMA_DATA_WIDTH 0x100000
#define APB_DMA_DATA_WIDTH_MASK 0x300000
/*
* Data width of transfer:
*
* 00: Word
* 01: Half
* 10: Byte
*/
#define APB_DMA_DATA_WIDTH_4 0
#define APB_DMA_DATA_WIDTH_2 0x100000
#define APB_DMA_DATA_WIDTH_1 0x200000
#define APB_DMA_CYCLES_MASK 0x00ffffff
#define MOXART_DMA_DATA_TYPE_S8 0x00
#define MOXART_DMA_DATA_TYPE_S16 0x01
#define MOXART_DMA_DATA_TYPE_S32 0x02
struct moxart_sg {
dma_addr_t addr;
uint32_t len;
};
struct moxart_desc {
enum dma_transfer_direction dma_dir;
dma_addr_t dev_addr;
unsigned int sglen;
unsigned int dma_cycles;
struct virt_dma_desc vd;
uint8_t es;
struct moxart_sg sg[];
};
struct moxart_chan {
struct virt_dma_chan vc;
void __iomem *base;
struct moxart_desc *desc;
struct dma_slave_config cfg;
bool allocated;
bool error;
int ch_num;
unsigned int line_reqno;
unsigned int sgidx;
};
struct moxart_dmadev {
struct dma_device dma_slave;
struct moxart_chan slave_chans[APB_DMA_MAX_CHANNEL];
unsigned int irq;
};
struct moxart_filter_data {
struct moxart_dmadev *mdc;
struct of_phandle_args *dma_spec;
};
static const unsigned int es_bytes[] = {
[MOXART_DMA_DATA_TYPE_S8] = 1,
[MOXART_DMA_DATA_TYPE_S16] = 2,
[MOXART_DMA_DATA_TYPE_S32] = 4,
};
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static inline struct moxart_chan *to_moxart_dma_chan(struct dma_chan *c)
{
return container_of(c, struct moxart_chan, vc.chan);
}
static inline struct moxart_desc *to_moxart_dma_desc(
struct dma_async_tx_descriptor *t)
{
return container_of(t, struct moxart_desc, vd.tx);
}
static void moxart_dma_desc_free(struct virt_dma_desc *vd)
{
kfree(container_of(vd, struct moxart_desc, vd));
}
static int moxart_terminate_all(struct dma_chan *chan)
{
struct moxart_chan *ch = to_moxart_dma_chan(chan);
unsigned long flags;
LIST_HEAD(head);
u32 ctrl;
dev_dbg(chan2dev(chan), "%s: ch=%p\n", __func__, ch);
spin_lock_irqsave(&ch->vc.lock, flags);
if (ch->desc) {
moxart_dma_desc_free(&ch->desc->vd);
ch->desc = NULL;
}
ctrl = readl(ch->base + REG_OFF_CTRL);
ctrl &= ~(APB_DMA_ENABLE | APB_DMA_FIN_INT_EN | APB_DMA_ERR_INT_EN);
writel(ctrl, ch->base + REG_OFF_CTRL);
vchan_get_all_descriptors(&ch->vc, &head);
spin_unlock_irqrestore(&ch->vc.lock, flags);
vchan_dma_desc_free_list(&ch->vc, &head);
return 0;
}
static int moxart_slave_config(struct dma_chan *chan,
struct dma_slave_config *cfg)
{
struct moxart_chan *ch = to_moxart_dma_chan(chan);
u32 ctrl;
ch->cfg = *cfg;
ctrl = readl(ch->base + REG_OFF_CTRL);
ctrl |= APB_DMA_BURST_MODE;
ctrl &= ~(APB_DMA_DEST_MASK | APB_DMA_SOURCE_MASK);
ctrl &= ~(APB_DMA_DEST_REQ_NO_MASK | APB_DMA_SOURCE_REQ_NO_MASK);
switch (ch->cfg.src_addr_width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
ctrl |= APB_DMA_DATA_WIDTH_1;
if (ch->cfg.direction != DMA_MEM_TO_DEV)
ctrl |= APB_DMA_DEST_INC_1_4;
else
ctrl |= APB_DMA_SOURCE_INC_1_4;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
ctrl |= APB_DMA_DATA_WIDTH_2;
if (ch->cfg.direction != DMA_MEM_TO_DEV)
ctrl |= APB_DMA_DEST_INC_2_8;
else
ctrl |= APB_DMA_SOURCE_INC_2_8;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
ctrl &= ~APB_DMA_DATA_WIDTH;
if (ch->cfg.direction != DMA_MEM_TO_DEV)
ctrl |= APB_DMA_DEST_INC_4_16;
else
ctrl |= APB_DMA_SOURCE_INC_4_16;
break;
default:
return -EINVAL;
}
if (ch->cfg.direction == DMA_MEM_TO_DEV) {
ctrl &= ~APB_DMA_DEST_SELECT;
ctrl |= APB_DMA_SOURCE_SELECT;
ctrl |= (ch->line_reqno << 16 &
APB_DMA_DEST_REQ_NO_MASK);
} else {
ctrl |= APB_DMA_DEST_SELECT;
ctrl &= ~APB_DMA_SOURCE_SELECT;
ctrl |= (ch->line_reqno << 24 &
APB_DMA_SOURCE_REQ_NO_MASK);
}
writel(ctrl, ch->base + REG_OFF_CTRL);
return 0;
}
static struct dma_async_tx_descriptor *moxart_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long tx_flags, void *context)
{
struct moxart_chan *ch = to_moxart_dma_chan(chan);
struct moxart_desc *d;
enum dma_slave_buswidth dev_width;
dma_addr_t dev_addr;
struct scatterlist *sgent;
unsigned int es;
unsigned int i;
if (!is_slave_direction(dir)) {
dev_err(chan2dev(chan), "%s: invalid DMA direction\n",
__func__);
return NULL;
}
if (dir == DMA_DEV_TO_MEM) {
dev_addr = ch->cfg.src_addr;
dev_width = ch->cfg.src_addr_width;
} else {
dev_addr = ch->cfg.dst_addr;
dev_width = ch->cfg.dst_addr_width;
}
switch (dev_width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
es = MOXART_DMA_DATA_TYPE_S8;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
es = MOXART_DMA_DATA_TYPE_S16;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
es = MOXART_DMA_DATA_TYPE_S32;
break;
default:
dev_err(chan2dev(chan), "%s: unsupported data width (%u)\n",
__func__, dev_width);
return NULL;
}
d = kzalloc(struct_size(d, sg, sg_len), GFP_ATOMIC);
if (!d)
return NULL;
d->dma_dir = dir;
d->dev_addr = dev_addr;
d->es = es;
for_each_sg(sgl, sgent, sg_len, i) {
d->sg[i].addr = sg_dma_address(sgent);
d->sg[i].len = sg_dma_len(sgent);
}
d->sglen = sg_len;
ch->error = 0;
return vchan_tx_prep(&ch->vc, &d->vd, tx_flags);
}
static struct dma_chan *moxart_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct moxart_dmadev *mdc = ofdma->of_dma_data;
struct dma_chan *chan;
struct moxart_chan *ch;
chan = dma_get_any_slave_channel(&mdc->dma_slave);
if (!chan)
return NULL;
ch = to_moxart_dma_chan(chan);
ch->line_reqno = dma_spec->args[0];
return chan;
}
static int moxart_alloc_chan_resources(struct dma_chan *chan)
{
struct moxart_chan *ch = to_moxart_dma_chan(chan);
dev_dbg(chan2dev(chan), "%s: allocating channel #%u\n",
__func__, ch->ch_num);
ch->allocated = 1;
return 0;
}
static void moxart_free_chan_resources(struct dma_chan *chan)
{
struct moxart_chan *ch = to_moxart_dma_chan(chan);
vchan_free_chan_resources(&ch->vc);
dev_dbg(chan2dev(chan), "%s: freeing channel #%u\n",
__func__, ch->ch_num);
ch->allocated = 0;
}
static void moxart_dma_set_params(struct moxart_chan *ch, dma_addr_t src_addr,
dma_addr_t dst_addr)
{
writel(src_addr, ch->base + REG_OFF_ADDRESS_SOURCE);
writel(dst_addr, ch->base + REG_OFF_ADDRESS_DEST);
}
static void moxart_set_transfer_params(struct moxart_chan *ch, unsigned int len)
{
struct moxart_desc *d = ch->desc;
unsigned int sglen_div = es_bytes[d->es];
d->dma_cycles = len >> sglen_div;
/*
* There are 4 cycles on 64 bytes copied, i.e. one cycle copies 16
* bytes ( when width is APB_DMAB_DATA_WIDTH_4 ).
*/
writel(d->dma_cycles, ch->base + REG_OFF_CYCLES);
dev_dbg(chan2dev(&ch->vc.chan), "%s: set %u DMA cycles (len=%u)\n",
__func__, d->dma_cycles, len);
}
static void moxart_start_dma(struct moxart_chan *ch)
{
u32 ctrl;
ctrl = readl(ch->base + REG_OFF_CTRL);
ctrl |= (APB_DMA_ENABLE | APB_DMA_FIN_INT_EN | APB_DMA_ERR_INT_EN);
writel(ctrl, ch->base + REG_OFF_CTRL);
}
static void moxart_dma_start_sg(struct moxart_chan *ch, unsigned int idx)
{
struct moxart_desc *d = ch->desc;
struct moxart_sg *sg = ch->desc->sg + idx;
if (ch->desc->dma_dir == DMA_MEM_TO_DEV)
moxart_dma_set_params(ch, sg->addr, d->dev_addr);
else if (ch->desc->dma_dir == DMA_DEV_TO_MEM)
moxart_dma_set_params(ch, d->dev_addr, sg->addr);
moxart_set_transfer_params(ch, sg->len);
moxart_start_dma(ch);
}
static void moxart_dma_start_desc(struct dma_chan *chan)
{
struct moxart_chan *ch = to_moxart_dma_chan(chan);
struct virt_dma_desc *vd;
vd = vchan_next_desc(&ch->vc);
if (!vd) {
ch->desc = NULL;
return;
}
list_del(&vd->node);
ch->desc = to_moxart_dma_desc(&vd->tx);
ch->sgidx = 0;
moxart_dma_start_sg(ch, 0);
}
static void moxart_issue_pending(struct dma_chan *chan)
{
struct moxart_chan *ch = to_moxart_dma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&ch->vc.lock, flags);
if (vchan_issue_pending(&ch->vc) && !ch->desc)
moxart_dma_start_desc(chan);
spin_unlock_irqrestore(&ch->vc.lock, flags);
}
static size_t moxart_dma_desc_size(struct moxart_desc *d,
unsigned int completed_sgs)
{
unsigned int i;
size_t size;
for (size = i = completed_sgs; i < d->sglen; i++)
size += d->sg[i].len;
return size;
}
static size_t moxart_dma_desc_size_in_flight(struct moxart_chan *ch)
{
size_t size;
unsigned int completed_cycles, cycles;
size = moxart_dma_desc_size(ch->desc, ch->sgidx);
cycles = readl(ch->base + REG_OFF_CYCLES);
completed_cycles = (ch->desc->dma_cycles - cycles);
size -= completed_cycles << es_bytes[ch->desc->es];
dev_dbg(chan2dev(&ch->vc.chan), "%s: size=%zu\n", __func__, size);
return size;
}
static enum dma_status moxart_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct moxart_chan *ch = to_moxart_dma_chan(chan);
struct virt_dma_desc *vd;
struct moxart_desc *d;
enum dma_status ret;
unsigned long flags;
/*
* dma_cookie_status() assigns initial residue value.
*/
ret = dma_cookie_status(chan, cookie, txstate);
spin_lock_irqsave(&ch->vc.lock, flags);
vd = vchan_find_desc(&ch->vc, cookie);
if (vd) {
d = to_moxart_dma_desc(&vd->tx);
txstate->residue = moxart_dma_desc_size(d, 0);
} else if (ch->desc && ch->desc->vd.tx.cookie == cookie) {
txstate->residue = moxart_dma_desc_size_in_flight(ch);
}
spin_unlock_irqrestore(&ch->vc.lock, flags);
if (ch->error)
return DMA_ERROR;
return ret;
}
static void moxart_dma_init(struct dma_device *dma, struct device *dev)
{
dma->device_prep_slave_sg = moxart_prep_slave_sg;
dma->device_alloc_chan_resources = moxart_alloc_chan_resources;
dma->device_free_chan_resources = moxart_free_chan_resources;
dma->device_issue_pending = moxart_issue_pending;
dma->device_tx_status = moxart_tx_status;
dma->device_config = moxart_slave_config;
dma->device_terminate_all = moxart_terminate_all;
dma->dev = dev;
INIT_LIST_HEAD(&dma->channels);
}
static irqreturn_t moxart_dma_interrupt(int irq, void *devid)
{
struct moxart_dmadev *mc = devid;
struct moxart_chan *ch = &mc->slave_chans[0];
unsigned int i;
u32 ctrl;
dev_dbg(chan2dev(&ch->vc.chan), "%s\n", __func__);
for (i = 0; i < APB_DMA_MAX_CHANNEL; i++, ch++) {
if (!ch->allocated)
continue;
ctrl = readl(ch->base + REG_OFF_CTRL);
dev_dbg(chan2dev(&ch->vc.chan), "%s: ch=%p ch->base=%p ctrl=%x\n",
__func__, ch, ch->base, ctrl);
if (ctrl & APB_DMA_FIN_INT_STS) {
ctrl &= ~APB_DMA_FIN_INT_STS;
if (ch->desc) {
spin_lock(&ch->vc.lock);
if (++ch->sgidx < ch->desc->sglen) {
moxart_dma_start_sg(ch, ch->sgidx);
} else {
vchan_cookie_complete(&ch->desc->vd);
moxart_dma_start_desc(&ch->vc.chan);
}
spin_unlock(&ch->vc.lock);
}
}
if (ctrl & APB_DMA_ERR_INT_STS) {
ctrl &= ~APB_DMA_ERR_INT_STS;
ch->error = 1;
}
writel(ctrl, ch->base + REG_OFF_CTRL);
}
return IRQ_HANDLED;
}
static int moxart_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
void __iomem *dma_base_addr;
int ret, i;
unsigned int irq;
struct moxart_chan *ch;
struct moxart_dmadev *mdc;
mdc = devm_kzalloc(dev, sizeof(*mdc), GFP_KERNEL);
if (!mdc)
return -ENOMEM;
irq = irq_of_parse_and_map(node, 0);
if (!irq) {
dev_err(dev, "no IRQ resource\n");
return -EINVAL;
}
dma_base_addr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(dma_base_addr))
return PTR_ERR(dma_base_addr);
dma_cap_zero(mdc->dma_slave.cap_mask);
dma_cap_set(DMA_SLAVE, mdc->dma_slave.cap_mask);
dma_cap_set(DMA_PRIVATE, mdc->dma_slave.cap_mask);
moxart_dma_init(&mdc->dma_slave, dev);
ch = &mdc->slave_chans[0];
for (i = 0; i < APB_DMA_MAX_CHANNEL; i++, ch++) {
ch->ch_num = i;
ch->base = dma_base_addr + i * REG_OFF_CHAN_SIZE;
ch->allocated = 0;
ch->vc.desc_free = moxart_dma_desc_free;
vchan_init(&ch->vc, &mdc->dma_slave);
dev_dbg(dev, "%s: chs[%d]: ch->ch_num=%u ch->base=%p\n",
__func__, i, ch->ch_num, ch->base);
}
platform_set_drvdata(pdev, mdc);
ret = devm_request_irq(dev, irq, moxart_dma_interrupt, 0,
"moxart-dma-engine", mdc);
if (ret) {
dev_err(dev, "devm_request_irq failed\n");
return ret;
}
mdc->irq = irq;
ret = dma_async_device_register(&mdc->dma_slave);
if (ret) {
dev_err(dev, "dma_async_device_register failed\n");
return ret;
}
ret = of_dma_controller_register(node, moxart_of_xlate, mdc);
if (ret) {
dev_err(dev, "of_dma_controller_register failed\n");
dma_async_device_unregister(&mdc->dma_slave);
return ret;
}
dev_dbg(dev, "%s: IRQ=%u\n", __func__, irq);
return 0;
}
static int moxart_remove(struct platform_device *pdev)
{
struct moxart_dmadev *m = platform_get_drvdata(pdev);
devm_free_irq(&pdev->dev, m->irq, m);
dma_async_device_unregister(&m->dma_slave);
if (pdev->dev.of_node)
of_dma_controller_free(pdev->dev.of_node);
return 0;
}
static const struct of_device_id moxart_dma_match[] = {
{ .compatible = "moxa,moxart-dma" },
{ }
};
MODULE_DEVICE_TABLE(of, moxart_dma_match);
static struct platform_driver moxart_driver = {
.probe = moxart_probe,
.remove = moxart_remove,
.driver = {
.name = "moxart-dma-engine",
.of_match_table = moxart_dma_match,
},
};
static int moxart_init(void)
{
return platform_driver_register(&moxart_driver);
}
subsys_initcall(moxart_init);
static void __exit moxart_exit(void)
{
platform_driver_unregister(&moxart_driver);
}
module_exit(moxart_exit);
MODULE_AUTHOR("Jonas Jensen <[email protected]>");
MODULE_DESCRIPTION("MOXART DMA engine driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/moxart-dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2015 Robert Jarzmik <[email protected]>
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/dmaengine.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/platform_data/mmp_dma.h>
#include <linux/dmapool.h>
#include <linux/of_device.h>
#include <linux/of_dma.h>
#include <linux/of.h>
#include <linux/wait.h>
#include <linux/dma/pxa-dma.h>
#include "dmaengine.h"
#include "virt-dma.h"
#define DCSR(n) (0x0000 + ((n) << 2))
#define DALGN(n) 0x00a0
#define DINT 0x00f0
#define DDADR(n) (0x0200 + ((n) << 4))
#define DSADR(n) (0x0204 + ((n) << 4))
#define DTADR(n) (0x0208 + ((n) << 4))
#define DCMD(n) (0x020c + ((n) << 4))
#define PXA_DCSR_RUN BIT(31) /* Run Bit (read / write) */
#define PXA_DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */
#define PXA_DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (R/W) */
#define PXA_DCSR_REQPEND BIT(8) /* Request Pending (read-only) */
#define PXA_DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */
#define PXA_DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */
#define PXA_DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */
#define PXA_DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */
#define PXA_DCSR_EORIRQEN BIT(28) /* End of Receive IRQ Enable (R/W) */
#define PXA_DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */
#define PXA_DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */
#define PXA_DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */
#define PXA_DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */
#define PXA_DCSR_CMPST BIT(10) /* The Descriptor Compare Status */
#define PXA_DCSR_EORINTR BIT(9) /* The end of Receive */
#define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */
#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
#define DDADR_STOP BIT(0) /* Stop (read / write) */
#define PXA_DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */
#define PXA_DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */
#define PXA_DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */
#define PXA_DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */
#define PXA_DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */
#define PXA_DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */
#define PXA_DCMD_ENDIAN BIT(18) /* Device Endian-ness. */
#define PXA_DCMD_BURST8 (1 << 16) /* 8 byte burst */
#define PXA_DCMD_BURST16 (2 << 16) /* 16 byte burst */
#define PXA_DCMD_BURST32 (3 << 16) /* 32 byte burst */
#define PXA_DCMD_WIDTH1 (1 << 14) /* 1 byte width */
#define PXA_DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
#define PXA_DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
#define PXA_DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
#define PDMA_ALIGNMENT 3
#define PDMA_MAX_DESC_BYTES (PXA_DCMD_LENGTH & ~((1 << PDMA_ALIGNMENT) - 1))
struct pxad_desc_hw {
u32 ddadr; /* Points to the next descriptor + flags */
u32 dsadr; /* DSADR value for the current transfer */
u32 dtadr; /* DTADR value for the current transfer */
u32 dcmd; /* DCMD value for the current transfer */
} __aligned(16);
struct pxad_desc_sw {
struct virt_dma_desc vd; /* Virtual descriptor */
int nb_desc; /* Number of hw. descriptors */
size_t len; /* Number of bytes xfered */
dma_addr_t first; /* First descriptor's addr */
/* At least one descriptor has an src/dst address not multiple of 8 */
bool misaligned;
bool cyclic;
struct dma_pool *desc_pool; /* Channel's used allocator */
struct pxad_desc_hw *hw_desc[]; /* DMA coherent descriptors */
};
struct pxad_phy {
int idx;
void __iomem *base;
struct pxad_chan *vchan;
};
struct pxad_chan {
struct virt_dma_chan vc; /* Virtual channel */
u32 drcmr; /* Requestor of the channel */
enum pxad_chan_prio prio; /* Required priority of phy */
/*
* At least one desc_sw in submitted or issued transfers on this channel
* has one address such as: addr % 8 != 0. This implies the DALGN
* setting on the phy.
*/
bool misaligned;
struct dma_slave_config cfg; /* Runtime config */
/* protected by vc->lock */
struct pxad_phy *phy;
struct dma_pool *desc_pool; /* Descriptors pool */
dma_cookie_t bus_error;
wait_queue_head_t wq_state;
};
struct pxad_device {
struct dma_device slave;
int nr_chans;
int nr_requestors;
void __iomem *base;
struct pxad_phy *phys;
spinlock_t phy_lock; /* Phy association */
#ifdef CONFIG_DEBUG_FS
struct dentry *dbgfs_root;
struct dentry **dbgfs_chan;
#endif
};
#define tx_to_pxad_desc(tx) \
container_of(tx, struct pxad_desc_sw, async_tx)
#define to_pxad_chan(dchan) \
container_of(dchan, struct pxad_chan, vc.chan)
#define to_pxad_dev(dmadev) \
container_of(dmadev, struct pxad_device, slave)
#define to_pxad_sw_desc(_vd) \
container_of((_vd), struct pxad_desc_sw, vd)
#define _phy_readl_relaxed(phy, _reg) \
readl_relaxed((phy)->base + _reg((phy)->idx))
#define phy_readl_relaxed(phy, _reg) \
({ \
u32 _v; \
_v = readl_relaxed((phy)->base + _reg((phy)->idx)); \
dev_vdbg(&phy->vchan->vc.chan.dev->device, \
"%s(): readl(%s): 0x%08x\n", __func__, #_reg, \
_v); \
_v; \
})
#define phy_writel(phy, val, _reg) \
do { \
writel((val), (phy)->base + _reg((phy)->idx)); \
dev_vdbg(&phy->vchan->vc.chan.dev->device, \
"%s(): writel(0x%08x, %s)\n", \
__func__, (u32)(val), #_reg); \
} while (0)
#define phy_writel_relaxed(phy, val, _reg) \
do { \
writel_relaxed((val), (phy)->base + _reg((phy)->idx)); \
dev_vdbg(&phy->vchan->vc.chan.dev->device, \
"%s(): writel_relaxed(0x%08x, %s)\n", \
__func__, (u32)(val), #_reg); \
} while (0)
static unsigned int pxad_drcmr(unsigned int line)
{
if (line < 64)
return 0x100 + line * 4;
return 0x1000 + line * 4;
}
static bool pxad_filter_fn(struct dma_chan *chan, void *param);
/*
* Debug fs
*/
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/seq_file.h>
static int requester_chan_show(struct seq_file *s, void *p)
{
struct pxad_phy *phy = s->private;
int i;
u32 drcmr;
seq_printf(s, "DMA channel %d requester :\n", phy->idx);
for (i = 0; i < 70; i++) {
drcmr = readl_relaxed(phy->base + pxad_drcmr(i));
if ((drcmr & DRCMR_CHLNUM) == phy->idx)
seq_printf(s, "\tRequester %d (MAPVLD=%d)\n", i,
!!(drcmr & DRCMR_MAPVLD));
}
return 0;
}
static inline int dbg_burst_from_dcmd(u32 dcmd)
{
int burst = (dcmd >> 16) & 0x3;
return burst ? 4 << burst : 0;
}
static int is_phys_valid(unsigned long addr)
{
return pfn_valid(__phys_to_pfn(addr));
}
#define PXA_DCSR_STR(flag) (dcsr & PXA_DCSR_##flag ? #flag" " : "")
#define PXA_DCMD_STR(flag) (dcmd & PXA_DCMD_##flag ? #flag" " : "")
static int descriptors_show(struct seq_file *s, void *p)
{
struct pxad_phy *phy = s->private;
int i, max_show = 20, burst, width;
u32 dcmd;
unsigned long phys_desc, ddadr;
struct pxad_desc_hw *desc;
phys_desc = ddadr = _phy_readl_relaxed(phy, DDADR);
seq_printf(s, "DMA channel %d descriptors :\n", phy->idx);
seq_printf(s, "[%03d] First descriptor unknown\n", 0);
for (i = 1; i < max_show && is_phys_valid(phys_desc); i++) {
desc = phys_to_virt(phys_desc);
dcmd = desc->dcmd;
burst = dbg_burst_from_dcmd(dcmd);
width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
seq_printf(s, "[%03d] Desc at %08lx(virt %p)\n",
i, phys_desc, desc);
seq_printf(s, "\tDDADR = %08x\n", desc->ddadr);
seq_printf(s, "\tDSADR = %08x\n", desc->dsadr);
seq_printf(s, "\tDTADR = %08x\n", desc->dtadr);
seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n",
dcmd,
PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR),
PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG),
PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN),
PXA_DCMD_STR(ENDIAN), burst, width,
dcmd & PXA_DCMD_LENGTH);
phys_desc = desc->ddadr;
}
if (i == max_show)
seq_printf(s, "[%03d] Desc at %08lx ... max display reached\n",
i, phys_desc);
else
seq_printf(s, "[%03d] Desc at %08lx is %s\n",
i, phys_desc, phys_desc == DDADR_STOP ?
"DDADR_STOP" : "invalid");
return 0;
}
static int chan_state_show(struct seq_file *s, void *p)
{
struct pxad_phy *phy = s->private;
u32 dcsr, dcmd;
int burst, width;
static const char * const str_prio[] = {
"high", "normal", "low", "invalid"
};
dcsr = _phy_readl_relaxed(phy, DCSR);
dcmd = _phy_readl_relaxed(phy, DCMD);
burst = dbg_burst_from_dcmd(dcmd);
width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
seq_printf(s, "DMA channel %d\n", phy->idx);
seq_printf(s, "\tPriority : %s\n",
str_prio[(phy->idx & 0xf) / 4]);
seq_printf(s, "\tUnaligned transfer bit: %s\n",
_phy_readl_relaxed(phy, DALGN) & BIT(phy->idx) ?
"yes" : "no");
seq_printf(s, "\tDCSR = %08x (%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n",
dcsr, PXA_DCSR_STR(RUN), PXA_DCSR_STR(NODESC),
PXA_DCSR_STR(STOPIRQEN), PXA_DCSR_STR(EORIRQEN),
PXA_DCSR_STR(EORJMPEN), PXA_DCSR_STR(EORSTOPEN),
PXA_DCSR_STR(SETCMPST), PXA_DCSR_STR(CLRCMPST),
PXA_DCSR_STR(CMPST), PXA_DCSR_STR(EORINTR),
PXA_DCSR_STR(REQPEND), PXA_DCSR_STR(STOPSTATE),
PXA_DCSR_STR(ENDINTR), PXA_DCSR_STR(STARTINTR),
PXA_DCSR_STR(BUSERR));
seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n",
dcmd,
PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR),
PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG),
PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN),
PXA_DCMD_STR(ENDIAN), burst, width, dcmd & PXA_DCMD_LENGTH);
seq_printf(s, "\tDSADR = %08x\n", _phy_readl_relaxed(phy, DSADR));
seq_printf(s, "\tDTADR = %08x\n", _phy_readl_relaxed(phy, DTADR));
seq_printf(s, "\tDDADR = %08x\n", _phy_readl_relaxed(phy, DDADR));
return 0;
}
static int state_show(struct seq_file *s, void *p)
{
struct pxad_device *pdev = s->private;
/* basic device status */
seq_puts(s, "DMA engine status\n");
seq_printf(s, "\tChannel number: %d\n", pdev->nr_chans);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(state);
DEFINE_SHOW_ATTRIBUTE(chan_state);
DEFINE_SHOW_ATTRIBUTE(descriptors);
DEFINE_SHOW_ATTRIBUTE(requester_chan);
static struct dentry *pxad_dbg_alloc_chan(struct pxad_device *pdev,
int ch, struct dentry *chandir)
{
char chan_name[11];
struct dentry *chan;
void *dt;
scnprintf(chan_name, sizeof(chan_name), "%d", ch);
chan = debugfs_create_dir(chan_name, chandir);
dt = (void *)&pdev->phys[ch];
debugfs_create_file("state", 0400, chan, dt, &chan_state_fops);
debugfs_create_file("descriptors", 0400, chan, dt, &descriptors_fops);
debugfs_create_file("requesters", 0400, chan, dt, &requester_chan_fops);
return chan;
}
static void pxad_init_debugfs(struct pxad_device *pdev)
{
int i;
struct dentry *chandir;
pdev->dbgfs_chan =
kmalloc_array(pdev->nr_chans, sizeof(struct dentry *),
GFP_KERNEL);
if (!pdev->dbgfs_chan)
return;
pdev->dbgfs_root = debugfs_create_dir(dev_name(pdev->slave.dev), NULL);
debugfs_create_file("state", 0400, pdev->dbgfs_root, pdev, &state_fops);
chandir = debugfs_create_dir("channels", pdev->dbgfs_root);
for (i = 0; i < pdev->nr_chans; i++)
pdev->dbgfs_chan[i] = pxad_dbg_alloc_chan(pdev, i, chandir);
}
static void pxad_cleanup_debugfs(struct pxad_device *pdev)
{
debugfs_remove_recursive(pdev->dbgfs_root);
}
#else
static inline void pxad_init_debugfs(struct pxad_device *pdev) {}
static inline void pxad_cleanup_debugfs(struct pxad_device *pdev) {}
#endif
static struct pxad_phy *lookup_phy(struct pxad_chan *pchan)
{
int prio, i;
struct pxad_device *pdev = to_pxad_dev(pchan->vc.chan.device);
struct pxad_phy *phy, *found = NULL;
unsigned long flags;
/*
* dma channel priorities
* ch 0 - 3, 16 - 19 <--> (0)
* ch 4 - 7, 20 - 23 <--> (1)
* ch 8 - 11, 24 - 27 <--> (2)
* ch 12 - 15, 28 - 31 <--> (3)
*/
spin_lock_irqsave(&pdev->phy_lock, flags);
for (prio = pchan->prio; prio >= PXAD_PRIO_HIGHEST; prio--) {
for (i = 0; i < pdev->nr_chans; i++) {
if (prio != (i & 0xf) >> 2)
continue;
phy = &pdev->phys[i];
if (!phy->vchan) {
phy->vchan = pchan;
found = phy;
goto out_unlock;
}
}
}
out_unlock:
spin_unlock_irqrestore(&pdev->phy_lock, flags);
dev_dbg(&pchan->vc.chan.dev->device,
"%s(): phy=%p(%d)\n", __func__, found,
found ? found->idx : -1);
return found;
}
static void pxad_free_phy(struct pxad_chan *chan)
{
struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device);
unsigned long flags;
u32 reg;
dev_dbg(&chan->vc.chan.dev->device,
"%s(): freeing\n", __func__);
if (!chan->phy)
return;
/* clear the channel mapping in DRCMR */
if (chan->drcmr <= pdev->nr_requestors) {
reg = pxad_drcmr(chan->drcmr);
writel_relaxed(0, chan->phy->base + reg);
}
spin_lock_irqsave(&pdev->phy_lock, flags);
chan->phy->vchan = NULL;
chan->phy = NULL;
spin_unlock_irqrestore(&pdev->phy_lock, flags);
}
static bool is_chan_running(struct pxad_chan *chan)
{
u32 dcsr;
struct pxad_phy *phy = chan->phy;
if (!phy)
return false;
dcsr = phy_readl_relaxed(phy, DCSR);
return dcsr & PXA_DCSR_RUN;
}
static bool is_running_chan_misaligned(struct pxad_chan *chan)
{
u32 dalgn;
BUG_ON(!chan->phy);
dalgn = phy_readl_relaxed(chan->phy, DALGN);
return dalgn & (BIT(chan->phy->idx));
}
static void phy_enable(struct pxad_phy *phy, bool misaligned)
{
struct pxad_device *pdev;
u32 reg, dalgn;
if (!phy->vchan)
return;
dev_dbg(&phy->vchan->vc.chan.dev->device,
"%s(); phy=%p(%d) misaligned=%d\n", __func__,
phy, phy->idx, misaligned);
pdev = to_pxad_dev(phy->vchan->vc.chan.device);
if (phy->vchan->drcmr <= pdev->nr_requestors) {
reg = pxad_drcmr(phy->vchan->drcmr);
writel_relaxed(DRCMR_MAPVLD | phy->idx, phy->base + reg);
}
dalgn = phy_readl_relaxed(phy, DALGN);
if (misaligned)
dalgn |= BIT(phy->idx);
else
dalgn &= ~BIT(phy->idx);
phy_writel_relaxed(phy, dalgn, DALGN);
phy_writel(phy, PXA_DCSR_STOPIRQEN | PXA_DCSR_ENDINTR |
PXA_DCSR_BUSERR | PXA_DCSR_RUN, DCSR);
}
static void phy_disable(struct pxad_phy *phy)
{
u32 dcsr;
if (!phy)
return;
dcsr = phy_readl_relaxed(phy, DCSR);
dev_dbg(&phy->vchan->vc.chan.dev->device,
"%s(): phy=%p(%d)\n", __func__, phy, phy->idx);
phy_writel(phy, dcsr & ~PXA_DCSR_RUN & ~PXA_DCSR_STOPIRQEN, DCSR);
}
static void pxad_launch_chan(struct pxad_chan *chan,
struct pxad_desc_sw *desc)
{
dev_dbg(&chan->vc.chan.dev->device,
"%s(): desc=%p\n", __func__, desc);
if (!chan->phy) {
chan->phy = lookup_phy(chan);
if (!chan->phy) {
dev_dbg(&chan->vc.chan.dev->device,
"%s(): no free dma channel\n", __func__);
return;
}
}
chan->bus_error = 0;
/*
* Program the descriptor's address into the DMA controller,
* then start the DMA transaction
*/
phy_writel(chan->phy, desc->first, DDADR);
phy_enable(chan->phy, chan->misaligned);
wake_up(&chan->wq_state);
}
static void set_updater_desc(struct pxad_desc_sw *sw_desc,
unsigned long flags)
{
struct pxad_desc_hw *updater =
sw_desc->hw_desc[sw_desc->nb_desc - 1];
dma_addr_t dma = sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr;
updater->ddadr = DDADR_STOP;
updater->dsadr = dma;
updater->dtadr = dma + 8;
updater->dcmd = PXA_DCMD_WIDTH4 | PXA_DCMD_BURST32 |
(PXA_DCMD_LENGTH & sizeof(u32));
if (flags & DMA_PREP_INTERRUPT)
updater->dcmd |= PXA_DCMD_ENDIRQEN;
if (sw_desc->cyclic)
sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr = sw_desc->first;
}
static bool is_desc_completed(struct virt_dma_desc *vd)
{
struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd);
struct pxad_desc_hw *updater =
sw_desc->hw_desc[sw_desc->nb_desc - 1];
return updater->dtadr != (updater->dsadr + 8);
}
static void pxad_desc_chain(struct virt_dma_desc *vd1,
struct virt_dma_desc *vd2)
{
struct pxad_desc_sw *desc1 = to_pxad_sw_desc(vd1);
struct pxad_desc_sw *desc2 = to_pxad_sw_desc(vd2);
dma_addr_t dma_to_chain;
dma_to_chain = desc2->first;
desc1->hw_desc[desc1->nb_desc - 1]->ddadr = dma_to_chain;
}
static bool pxad_try_hotchain(struct virt_dma_chan *vc,
struct virt_dma_desc *vd)
{
struct virt_dma_desc *vd_last_issued = NULL;
struct pxad_chan *chan = to_pxad_chan(&vc->chan);
/*
* Attempt to hot chain the tx if the phy is still running. This is
* considered successful only if either the channel is still running
* after the chaining, or if the chained transfer is completed after
* having been hot chained.
* A change of alignment is not allowed, and forbids hotchaining.
*/
if (is_chan_running(chan)) {
BUG_ON(list_empty(&vc->desc_issued));
if (!is_running_chan_misaligned(chan) &&
to_pxad_sw_desc(vd)->misaligned)
return false;
vd_last_issued = list_entry(vc->desc_issued.prev,
struct virt_dma_desc, node);
pxad_desc_chain(vd_last_issued, vd);
if (is_chan_running(chan) || is_desc_completed(vd))
return true;
}
return false;
}
static unsigned int clear_chan_irq(struct pxad_phy *phy)
{
u32 dcsr;
u32 dint = readl(phy->base + DINT);
if (!(dint & BIT(phy->idx)))
return PXA_DCSR_RUN;
/* clear irq */
dcsr = phy_readl_relaxed(phy, DCSR);
phy_writel(phy, dcsr, DCSR);
if ((dcsr & PXA_DCSR_BUSERR) && (phy->vchan))
dev_warn(&phy->vchan->vc.chan.dev->device,
"%s(chan=%p): PXA_DCSR_BUSERR\n",
__func__, &phy->vchan);
return dcsr & ~PXA_DCSR_RUN;
}
static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
{
struct pxad_phy *phy = dev_id;
struct pxad_chan *chan = phy->vchan;
struct virt_dma_desc *vd, *tmp;
unsigned int dcsr;
bool vd_completed;
dma_cookie_t last_started = 0;
BUG_ON(!chan);
dcsr = clear_chan_irq(phy);
if (dcsr & PXA_DCSR_RUN)
return IRQ_NONE;
spin_lock(&chan->vc.lock);
list_for_each_entry_safe(vd, tmp, &chan->vc.desc_issued, node) {
vd_completed = is_desc_completed(vd);
dev_dbg(&chan->vc.chan.dev->device,
"%s(): checking txd %p[%x]: completed=%d dcsr=0x%x\n",
__func__, vd, vd->tx.cookie, vd_completed,
dcsr);
last_started = vd->tx.cookie;
if (to_pxad_sw_desc(vd)->cyclic) {
vchan_cyclic_callback(vd);
break;
}
if (vd_completed) {
list_del(&vd->node);
vchan_cookie_complete(vd);
} else {
break;
}
}
if (dcsr & PXA_DCSR_BUSERR) {
chan->bus_error = last_started;
phy_disable(phy);
}
if (!chan->bus_error && dcsr & PXA_DCSR_STOPSTATE) {
dev_dbg(&chan->vc.chan.dev->device,
"%s(): channel stopped, submitted_empty=%d issued_empty=%d",
__func__,
list_empty(&chan->vc.desc_submitted),
list_empty(&chan->vc.desc_issued));
phy_writel_relaxed(phy, dcsr & ~PXA_DCSR_STOPIRQEN, DCSR);
if (list_empty(&chan->vc.desc_issued)) {
chan->misaligned =
!list_empty(&chan->vc.desc_submitted);
} else {
vd = list_first_entry(&chan->vc.desc_issued,
struct virt_dma_desc, node);
pxad_launch_chan(chan, to_pxad_sw_desc(vd));
}
}
spin_unlock(&chan->vc.lock);
wake_up(&chan->wq_state);
return IRQ_HANDLED;
}
static irqreturn_t pxad_int_handler(int irq, void *dev_id)
{
struct pxad_device *pdev = dev_id;
struct pxad_phy *phy;
u32 dint = readl(pdev->base + DINT);
int i, ret = IRQ_NONE;
while (dint) {
i = __ffs(dint);
dint &= (dint - 1);
phy = &pdev->phys[i];
if (pxad_chan_handler(irq, phy) == IRQ_HANDLED)
ret = IRQ_HANDLED;
}
return ret;
}
static int pxad_alloc_chan_resources(struct dma_chan *dchan)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device);
if (chan->desc_pool)
return 1;
chan->desc_pool = dma_pool_create(dma_chan_name(dchan),
pdev->slave.dev,
sizeof(struct pxad_desc_hw),
__alignof__(struct pxad_desc_hw),
0);
if (!chan->desc_pool) {
dev_err(&chan->vc.chan.dev->device,
"%s(): unable to allocate descriptor pool\n",
__func__);
return -ENOMEM;
}
return 1;
}
static void pxad_free_chan_resources(struct dma_chan *dchan)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
vchan_free_chan_resources(&chan->vc);
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
chan->drcmr = U32_MAX;
chan->prio = PXAD_PRIO_LOWEST;
}
static void pxad_free_desc(struct virt_dma_desc *vd)
{
int i;
dma_addr_t dma;
struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd);
BUG_ON(sw_desc->nb_desc == 0);
for (i = sw_desc->nb_desc - 1; i >= 0; i--) {
if (i > 0)
dma = sw_desc->hw_desc[i - 1]->ddadr;
else
dma = sw_desc->first;
dma_pool_free(sw_desc->desc_pool,
sw_desc->hw_desc[i], dma);
}
sw_desc->nb_desc = 0;
kfree(sw_desc);
}
static struct pxad_desc_sw *
pxad_alloc_desc(struct pxad_chan *chan, unsigned int nb_hw_desc)
{
struct pxad_desc_sw *sw_desc;
dma_addr_t dma;
int i;
sw_desc = kzalloc(struct_size(sw_desc, hw_desc, nb_hw_desc),
GFP_NOWAIT);
if (!sw_desc)
return NULL;
sw_desc->desc_pool = chan->desc_pool;
for (i = 0; i < nb_hw_desc; i++) {
sw_desc->hw_desc[i] = dma_pool_alloc(sw_desc->desc_pool,
GFP_NOWAIT, &dma);
if (!sw_desc->hw_desc[i]) {
dev_err(&chan->vc.chan.dev->device,
"%s(): Couldn't allocate the %dth hw_desc from dma_pool %p\n",
__func__, i, sw_desc->desc_pool);
goto err;
}
if (i == 0)
sw_desc->first = dma;
else
sw_desc->hw_desc[i - 1]->ddadr = dma;
sw_desc->nb_desc++;
}
return sw_desc;
err:
pxad_free_desc(&sw_desc->vd);
return NULL;
}
static dma_cookie_t pxad_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct virt_dma_chan *vc = to_virt_chan(tx->chan);
struct pxad_chan *chan = to_pxad_chan(&vc->chan);
struct virt_dma_desc *vd_chained = NULL,
*vd = container_of(tx, struct virt_dma_desc, tx);
dma_cookie_t cookie;
unsigned long flags;
set_updater_desc(to_pxad_sw_desc(vd), tx->flags);
spin_lock_irqsave(&vc->lock, flags);
cookie = dma_cookie_assign(tx);
if (list_empty(&vc->desc_submitted) && pxad_try_hotchain(vc, vd)) {
list_move_tail(&vd->node, &vc->desc_issued);
dev_dbg(&chan->vc.chan.dev->device,
"%s(): txd %p[%x]: submitted (hot linked)\n",
__func__, vd, cookie);
goto out;
}
/*
* Fallback to placing the tx in the submitted queue
*/
if (!list_empty(&vc->desc_submitted)) {
vd_chained = list_entry(vc->desc_submitted.prev,
struct virt_dma_desc, node);
/*
* Only chain the descriptors if no new misalignment is
* introduced. If a new misalignment is chained, let the channel
* stop, and be relaunched in misalign mode from the irq
* handler.
*/
if (chan->misaligned || !to_pxad_sw_desc(vd)->misaligned)
pxad_desc_chain(vd_chained, vd);
else
vd_chained = NULL;
}
dev_dbg(&chan->vc.chan.dev->device,
"%s(): txd %p[%x]: submitted (%s linked)\n",
__func__, vd, cookie, vd_chained ? "cold" : "not");
list_move_tail(&vd->node, &vc->desc_submitted);
chan->misaligned |= to_pxad_sw_desc(vd)->misaligned;
out:
spin_unlock_irqrestore(&vc->lock, flags);
return cookie;
}
static void pxad_issue_pending(struct dma_chan *dchan)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
struct virt_dma_desc *vd_first;
unsigned long flags;
spin_lock_irqsave(&chan->vc.lock, flags);
if (list_empty(&chan->vc.desc_submitted))
goto out;
vd_first = list_first_entry(&chan->vc.desc_submitted,
struct virt_dma_desc, node);
dev_dbg(&chan->vc.chan.dev->device,
"%s(): txd %p[%x]", __func__, vd_first, vd_first->tx.cookie);
vchan_issue_pending(&chan->vc);
if (!pxad_try_hotchain(&chan->vc, vd_first))
pxad_launch_chan(chan, to_pxad_sw_desc(vd_first));
out:
spin_unlock_irqrestore(&chan->vc.lock, flags);
}
static inline struct dma_async_tx_descriptor *
pxad_tx_prep(struct virt_dma_chan *vc, struct virt_dma_desc *vd,
unsigned long tx_flags)
{
struct dma_async_tx_descriptor *tx;
struct pxad_chan *chan = container_of(vc, struct pxad_chan, vc);
INIT_LIST_HEAD(&vd->node);
tx = vchan_tx_prep(vc, vd, tx_flags);
tx->tx_submit = pxad_tx_submit;
dev_dbg(&chan->vc.chan.dev->device,
"%s(): vc=%p txd=%p[%x] flags=0x%lx\n", __func__,
vc, vd, vd->tx.cookie,
tx_flags);
return tx;
}
static void pxad_get_config(struct pxad_chan *chan,
enum dma_transfer_direction dir,
u32 *dcmd, u32 *dev_src, u32 *dev_dst)
{
u32 maxburst = 0, dev_addr = 0;
enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device);
*dcmd = 0;
if (dir == DMA_DEV_TO_MEM) {
maxburst = chan->cfg.src_maxburst;
width = chan->cfg.src_addr_width;
dev_addr = chan->cfg.src_addr;
*dev_src = dev_addr;
*dcmd |= PXA_DCMD_INCTRGADDR;
if (chan->drcmr <= pdev->nr_requestors)
*dcmd |= PXA_DCMD_FLOWSRC;
}
if (dir == DMA_MEM_TO_DEV) {
maxburst = chan->cfg.dst_maxburst;
width = chan->cfg.dst_addr_width;
dev_addr = chan->cfg.dst_addr;
*dev_dst = dev_addr;
*dcmd |= PXA_DCMD_INCSRCADDR;
if (chan->drcmr <= pdev->nr_requestors)
*dcmd |= PXA_DCMD_FLOWTRG;
}
if (dir == DMA_MEM_TO_MEM)
*dcmd |= PXA_DCMD_BURST32 | PXA_DCMD_INCTRGADDR |
PXA_DCMD_INCSRCADDR;
dev_dbg(&chan->vc.chan.dev->device,
"%s(): dev_addr=0x%x maxburst=%d width=%d dir=%d\n",
__func__, dev_addr, maxburst, width, dir);
if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
*dcmd |= PXA_DCMD_WIDTH1;
else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
*dcmd |= PXA_DCMD_WIDTH2;
else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES)
*dcmd |= PXA_DCMD_WIDTH4;
if (maxburst == 8)
*dcmd |= PXA_DCMD_BURST8;
else if (maxburst == 16)
*dcmd |= PXA_DCMD_BURST16;
else if (maxburst == 32)
*dcmd |= PXA_DCMD_BURST32;
}
static struct dma_async_tx_descriptor *
pxad_prep_memcpy(struct dma_chan *dchan,
dma_addr_t dma_dst, dma_addr_t dma_src,
size_t len, unsigned long flags)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
struct pxad_desc_sw *sw_desc;
struct pxad_desc_hw *hw_desc;
u32 dcmd;
unsigned int i, nb_desc = 0;
size_t copy;
if (!dchan || !len)
return NULL;
dev_dbg(&chan->vc.chan.dev->device,
"%s(): dma_dst=0x%lx dma_src=0x%lx len=%zu flags=%lx\n",
__func__, (unsigned long)dma_dst, (unsigned long)dma_src,
len, flags);
pxad_get_config(chan, DMA_MEM_TO_MEM, &dcmd, NULL, NULL);
nb_desc = DIV_ROUND_UP(len, PDMA_MAX_DESC_BYTES);
sw_desc = pxad_alloc_desc(chan, nb_desc + 1);
if (!sw_desc)
return NULL;
sw_desc->len = len;
if (!IS_ALIGNED(dma_src, 1 << PDMA_ALIGNMENT) ||
!IS_ALIGNED(dma_dst, 1 << PDMA_ALIGNMENT))
sw_desc->misaligned = true;
i = 0;
do {
hw_desc = sw_desc->hw_desc[i++];
copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES);
hw_desc->dcmd = dcmd | (PXA_DCMD_LENGTH & copy);
hw_desc->dsadr = dma_src;
hw_desc->dtadr = dma_dst;
len -= copy;
dma_src += copy;
dma_dst += copy;
} while (len);
set_updater_desc(sw_desc, flags);
return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags);
}
static struct dma_async_tx_descriptor *
pxad_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
struct pxad_desc_sw *sw_desc;
size_t len, avail;
struct scatterlist *sg;
dma_addr_t dma;
u32 dcmd, dsadr = 0, dtadr = 0;
unsigned int nb_desc = 0, i, j = 0;
if ((sgl == NULL) || (sg_len == 0))
return NULL;
pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr);
dev_dbg(&chan->vc.chan.dev->device,
"%s(): dir=%d flags=%lx\n", __func__, dir, flags);
for_each_sg(sgl, sg, sg_len, i)
nb_desc += DIV_ROUND_UP(sg_dma_len(sg), PDMA_MAX_DESC_BYTES);
sw_desc = pxad_alloc_desc(chan, nb_desc + 1);
if (!sw_desc)
return NULL;
for_each_sg(sgl, sg, sg_len, i) {
dma = sg_dma_address(sg);
avail = sg_dma_len(sg);
sw_desc->len += avail;
do {
len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES);
if (dma & 0x7)
sw_desc->misaligned = true;
sw_desc->hw_desc[j]->dcmd =
dcmd | (PXA_DCMD_LENGTH & len);
sw_desc->hw_desc[j]->dsadr = dsadr ? dsadr : dma;
sw_desc->hw_desc[j++]->dtadr = dtadr ? dtadr : dma;
dma += len;
avail -= len;
} while (avail);
}
set_updater_desc(sw_desc, flags);
return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags);
}
static struct dma_async_tx_descriptor *
pxad_prep_dma_cyclic(struct dma_chan *dchan,
dma_addr_t buf_addr, size_t len, size_t period_len,
enum dma_transfer_direction dir, unsigned long flags)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
struct pxad_desc_sw *sw_desc;
struct pxad_desc_hw **phw_desc;
dma_addr_t dma;
u32 dcmd, dsadr = 0, dtadr = 0;
unsigned int nb_desc = 0;
if (!dchan || !len || !period_len)
return NULL;
if ((dir != DMA_DEV_TO_MEM) && (dir != DMA_MEM_TO_DEV)) {
dev_err(&chan->vc.chan.dev->device,
"Unsupported direction for cyclic DMA\n");
return NULL;
}
/* the buffer length must be a multiple of period_len */
if (len % period_len != 0 || period_len > PDMA_MAX_DESC_BYTES ||
!IS_ALIGNED(period_len, 1 << PDMA_ALIGNMENT))
return NULL;
pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr);
dcmd |= PXA_DCMD_ENDIRQEN | (PXA_DCMD_LENGTH & period_len);
dev_dbg(&chan->vc.chan.dev->device,
"%s(): buf_addr=0x%lx len=%zu period=%zu dir=%d flags=%lx\n",
__func__, (unsigned long)buf_addr, len, period_len, dir, flags);
nb_desc = DIV_ROUND_UP(period_len, PDMA_MAX_DESC_BYTES);
nb_desc *= DIV_ROUND_UP(len, period_len);
sw_desc = pxad_alloc_desc(chan, nb_desc + 1);
if (!sw_desc)
return NULL;
sw_desc->cyclic = true;
sw_desc->len = len;
phw_desc = sw_desc->hw_desc;
dma = buf_addr;
do {
phw_desc[0]->dsadr = dsadr ? dsadr : dma;
phw_desc[0]->dtadr = dtadr ? dtadr : dma;
phw_desc[0]->dcmd = dcmd;
phw_desc++;
dma += period_len;
len -= period_len;
} while (len);
set_updater_desc(sw_desc, flags);
return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags);
}
static int pxad_config(struct dma_chan *dchan,
struct dma_slave_config *cfg)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
if (!dchan)
return -EINVAL;
chan->cfg = *cfg;
return 0;
}
static int pxad_terminate_all(struct dma_chan *dchan)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device);
struct virt_dma_desc *vd = NULL;
unsigned long flags;
struct pxad_phy *phy;
LIST_HEAD(head);
dev_dbg(&chan->vc.chan.dev->device,
"%s(): vchan %p: terminate all\n", __func__, &chan->vc);
spin_lock_irqsave(&chan->vc.lock, flags);
vchan_get_all_descriptors(&chan->vc, &head);
list_for_each_entry(vd, &head, node) {
dev_dbg(&chan->vc.chan.dev->device,
"%s(): cancelling txd %p[%x] (completed=%d)", __func__,
vd, vd->tx.cookie, is_desc_completed(vd));
}
phy = chan->phy;
if (phy) {
phy_disable(chan->phy);
pxad_free_phy(chan);
chan->phy = NULL;
spin_lock(&pdev->phy_lock);
phy->vchan = NULL;
spin_unlock(&pdev->phy_lock);
}
spin_unlock_irqrestore(&chan->vc.lock, flags);
vchan_dma_desc_free_list(&chan->vc, &head);
return 0;
}
static unsigned int pxad_residue(struct pxad_chan *chan,
dma_cookie_t cookie)
{
struct virt_dma_desc *vd = NULL;
struct pxad_desc_sw *sw_desc = NULL;
struct pxad_desc_hw *hw_desc = NULL;
u32 curr, start, len, end, residue = 0;
unsigned long flags;
bool passed = false;
int i;
/*
* If the channel does not have a phy pointer anymore, it has already
* been completed. Therefore, its residue is 0.
*/
if (!chan->phy)
return 0;
spin_lock_irqsave(&chan->vc.lock, flags);
vd = vchan_find_desc(&chan->vc, cookie);
if (!vd)
goto out;
sw_desc = to_pxad_sw_desc(vd);
if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR)
curr = phy_readl_relaxed(chan->phy, DSADR);
else
curr = phy_readl_relaxed(chan->phy, DTADR);
/*
* curr has to be actually read before checking descriptor
* completion, so that a curr inside a status updater
* descriptor implies the following test returns true, and
* preventing reordering of curr load and the test.
*/
rmb();
if (is_desc_completed(vd))
goto out;
for (i = 0; i < sw_desc->nb_desc - 1; i++) {
hw_desc = sw_desc->hw_desc[i];
if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR)
start = hw_desc->dsadr;
else
start = hw_desc->dtadr;
len = hw_desc->dcmd & PXA_DCMD_LENGTH;
end = start + len;
/*
* 'passed' will be latched once we found the descriptor
* which lies inside the boundaries of the curr
* pointer. All descriptors that occur in the list
* _after_ we found that partially handled descriptor
* are still to be processed and are hence added to the
* residual bytes counter.
*/
if (passed) {
residue += len;
} else if (curr >= start && curr <= end) {
residue += end - curr;
passed = true;
}
}
if (!passed)
residue = sw_desc->len;
out:
spin_unlock_irqrestore(&chan->vc.lock, flags);
dev_dbg(&chan->vc.chan.dev->device,
"%s(): txd %p[%x] sw_desc=%p: %d\n",
__func__, vd, cookie, sw_desc, residue);
return residue;
}
static enum dma_status pxad_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
enum dma_status ret;
if (cookie == chan->bus_error)
return DMA_ERROR;
ret = dma_cookie_status(dchan, cookie, txstate);
if (likely(txstate && (ret != DMA_ERROR)))
dma_set_residue(txstate, pxad_residue(chan, cookie));
return ret;
}
static void pxad_synchronize(struct dma_chan *dchan)
{
struct pxad_chan *chan = to_pxad_chan(dchan);
wait_event(chan->wq_state, !is_chan_running(chan));
vchan_synchronize(&chan->vc);
}
static void pxad_free_channels(struct dma_device *dmadev)
{
struct pxad_chan *c, *cn;
list_for_each_entry_safe(c, cn, &dmadev->channels,
vc.chan.device_node) {
list_del(&c->vc.chan.device_node);
tasklet_kill(&c->vc.task);
}
}
static int pxad_remove(struct platform_device *op)
{
struct pxad_device *pdev = platform_get_drvdata(op);
pxad_cleanup_debugfs(pdev);
pxad_free_channels(&pdev->slave);
return 0;
}
static int pxad_init_phys(struct platform_device *op,
struct pxad_device *pdev,
unsigned int nb_phy_chans)
{
int irq0, irq, nr_irq = 0, i, ret;
struct pxad_phy *phy;
irq0 = platform_get_irq(op, 0);
if (irq0 < 0)
return irq0;
pdev->phys = devm_kcalloc(&op->dev, nb_phy_chans,
sizeof(pdev->phys[0]), GFP_KERNEL);
if (!pdev->phys)
return -ENOMEM;
for (i = 0; i < nb_phy_chans; i++)
if (platform_get_irq_optional(op, i) > 0)
nr_irq++;
for (i = 0; i < nb_phy_chans; i++) {
phy = &pdev->phys[i];
phy->base = pdev->base;
phy->idx = i;
irq = platform_get_irq_optional(op, i);
if ((nr_irq > 1) && (irq > 0))
ret = devm_request_irq(&op->dev, irq,
pxad_chan_handler,
IRQF_SHARED, "pxa-dma", phy);
if ((nr_irq == 1) && (i == 0))
ret = devm_request_irq(&op->dev, irq0,
pxad_int_handler,
IRQF_SHARED, "pxa-dma", pdev);
if (ret) {
dev_err(pdev->slave.dev,
"%s(): can't request irq %d:%d\n", __func__,
irq, ret);
return ret;
}
}
return 0;
}
static const struct of_device_id pxad_dt_ids[] = {
{ .compatible = "marvell,pdma-1.0", },
{}
};
MODULE_DEVICE_TABLE(of, pxad_dt_ids);
static struct dma_chan *pxad_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct pxad_device *d = ofdma->of_dma_data;
struct dma_chan *chan;
chan = dma_get_any_slave_channel(&d->slave);
if (!chan)
return NULL;
to_pxad_chan(chan)->drcmr = dma_spec->args[0];
to_pxad_chan(chan)->prio = dma_spec->args[1];
return chan;
}
static int pxad_init_dmadev(struct platform_device *op,
struct pxad_device *pdev,
unsigned int nr_phy_chans,
unsigned int nr_requestors)
{
int ret;
unsigned int i;
struct pxad_chan *c;
pdev->nr_chans = nr_phy_chans;
pdev->nr_requestors = nr_requestors;
INIT_LIST_HEAD(&pdev->slave.channels);
pdev->slave.device_alloc_chan_resources = pxad_alloc_chan_resources;
pdev->slave.device_free_chan_resources = pxad_free_chan_resources;
pdev->slave.device_tx_status = pxad_tx_status;
pdev->slave.device_issue_pending = pxad_issue_pending;
pdev->slave.device_config = pxad_config;
pdev->slave.device_synchronize = pxad_synchronize;
pdev->slave.device_terminate_all = pxad_terminate_all;
if (op->dev.coherent_dma_mask)
dma_set_mask(&op->dev, op->dev.coherent_dma_mask);
else
dma_set_mask(&op->dev, DMA_BIT_MASK(32));
ret = pxad_init_phys(op, pdev, nr_phy_chans);
if (ret)
return ret;
for (i = 0; i < nr_phy_chans; i++) {
c = devm_kzalloc(&op->dev, sizeof(*c), GFP_KERNEL);
if (!c)
return -ENOMEM;
c->drcmr = U32_MAX;
c->prio = PXAD_PRIO_LOWEST;
c->vc.desc_free = pxad_free_desc;
vchan_init(&c->vc, &pdev->slave);
init_waitqueue_head(&c->wq_state);
}
return dmaenginem_async_device_register(&pdev->slave);
}
static int pxad_probe(struct platform_device *op)
{
struct pxad_device *pdev;
const struct of_device_id *of_id;
const struct dma_slave_map *slave_map = NULL;
struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
int ret, dma_channels = 0, nb_requestors = 0, slave_map_cnt = 0;
const enum dma_slave_buswidth widths =
DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
DMA_SLAVE_BUSWIDTH_4_BYTES;
pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
if (!pdev)
return -ENOMEM;
spin_lock_init(&pdev->phy_lock);
pdev->base = devm_platform_ioremap_resource(op, 0);
if (IS_ERR(pdev->base))
return PTR_ERR(pdev->base);
of_id = of_match_device(pxad_dt_ids, &op->dev);
if (of_id) {
/* Parse new and deprecated dma-channels properties */
if (of_property_read_u32(op->dev.of_node, "dma-channels",
&dma_channels))
of_property_read_u32(op->dev.of_node, "#dma-channels",
&dma_channels);
/* Parse new and deprecated dma-requests properties */
ret = of_property_read_u32(op->dev.of_node, "dma-requests",
&nb_requestors);
if (ret)
ret = of_property_read_u32(op->dev.of_node, "#dma-requests",
&nb_requestors);
if (ret) {
dev_warn(pdev->slave.dev,
"#dma-requests set to default 32 as missing in OF: %d",
ret);
nb_requestors = 32;
}
} else if (pdata && pdata->dma_channels) {
dma_channels = pdata->dma_channels;
nb_requestors = pdata->nb_requestors;
slave_map = pdata->slave_map;
slave_map_cnt = pdata->slave_map_cnt;
} else {
dma_channels = 32; /* default 32 channel */
}
dma_cap_set(DMA_SLAVE, pdev->slave.cap_mask);
dma_cap_set(DMA_MEMCPY, pdev->slave.cap_mask);
dma_cap_set(DMA_CYCLIC, pdev->slave.cap_mask);
dma_cap_set(DMA_PRIVATE, pdev->slave.cap_mask);
pdev->slave.device_prep_dma_memcpy = pxad_prep_memcpy;
pdev->slave.device_prep_slave_sg = pxad_prep_slave_sg;
pdev->slave.device_prep_dma_cyclic = pxad_prep_dma_cyclic;
pdev->slave.filter.map = slave_map;
pdev->slave.filter.mapcnt = slave_map_cnt;
pdev->slave.filter.fn = pxad_filter_fn;
pdev->slave.copy_align = PDMA_ALIGNMENT;
pdev->slave.src_addr_widths = widths;
pdev->slave.dst_addr_widths = widths;
pdev->slave.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
pdev->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
pdev->slave.descriptor_reuse = true;
pdev->slave.dev = &op->dev;
ret = pxad_init_dmadev(op, pdev, dma_channels, nb_requestors);
if (ret) {
dev_err(pdev->slave.dev, "unable to register\n");
return ret;
}
if (op->dev.of_node) {
/* Device-tree DMA controller registration */
ret = of_dma_controller_register(op->dev.of_node,
pxad_dma_xlate, pdev);
if (ret < 0) {
dev_err(pdev->slave.dev,
"of_dma_controller_register failed\n");
return ret;
}
}
platform_set_drvdata(op, pdev);
pxad_init_debugfs(pdev);
dev_info(pdev->slave.dev, "initialized %d channels on %d requestors\n",
dma_channels, nb_requestors);
return 0;
}
static const struct platform_device_id pxad_id_table[] = {
{ "pxa-dma", },
{ },
};
static struct platform_driver pxad_driver = {
.driver = {
.name = "pxa-dma",
.of_match_table = pxad_dt_ids,
},
.id_table = pxad_id_table,
.probe = pxad_probe,
.remove = pxad_remove,
};
static bool pxad_filter_fn(struct dma_chan *chan, void *param)
{
struct pxad_chan *c = to_pxad_chan(chan);
struct pxad_param *p = param;
if (chan->device->dev->driver != &pxad_driver.driver)
return false;
c->drcmr = p->drcmr;
c->prio = p->prio;
return true;
}
module_platform_driver(pxad_driver);
MODULE_DESCRIPTION("Marvell PXA Peripheral DMA Driver");
MODULE_AUTHOR("Robert Jarzmik <[email protected]>");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/pxa_dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for the TXx9 SoC DMA Controller
*
* Copyright (C) 2009 Atsushi Nemoto
*/
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/scatterlist.h>
#include "dmaengine.h"
#include "txx9dmac.h"
static struct txx9dmac_chan *to_txx9dmac_chan(struct dma_chan *chan)
{
return container_of(chan, struct txx9dmac_chan, chan);
}
static struct txx9dmac_cregs __iomem *__dma_regs(const struct txx9dmac_chan *dc)
{
return dc->ch_regs;
}
static struct txx9dmac_cregs32 __iomem *__dma_regs32(
const struct txx9dmac_chan *dc)
{
return dc->ch_regs;
}
#define channel64_readq(dc, name) \
__raw_readq(&(__dma_regs(dc)->name))
#define channel64_writeq(dc, name, val) \
__raw_writeq((val), &(__dma_regs(dc)->name))
#define channel64_readl(dc, name) \
__raw_readl(&(__dma_regs(dc)->name))
#define channel64_writel(dc, name, val) \
__raw_writel((val), &(__dma_regs(dc)->name))
#define channel32_readl(dc, name) \
__raw_readl(&(__dma_regs32(dc)->name))
#define channel32_writel(dc, name, val) \
__raw_writel((val), &(__dma_regs32(dc)->name))
#define channel_readq(dc, name) channel64_readq(dc, name)
#define channel_writeq(dc, name, val) channel64_writeq(dc, name, val)
#define channel_readl(dc, name) \
(is_dmac64(dc) ? \
channel64_readl(dc, name) : channel32_readl(dc, name))
#define channel_writel(dc, name, val) \
(is_dmac64(dc) ? \
channel64_writel(dc, name, val) : channel32_writel(dc, name, val))
static dma_addr_t channel64_read_CHAR(const struct txx9dmac_chan *dc)
{
if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64))
return channel64_readq(dc, CHAR);
else
return channel64_readl(dc, CHAR);
}
static void channel64_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val)
{
if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64))
channel64_writeq(dc, CHAR, val);
else
channel64_writel(dc, CHAR, val);
}
static void channel64_clear_CHAR(const struct txx9dmac_chan *dc)
{
#if defined(CONFIG_32BIT) && !defined(CONFIG_PHYS_ADDR_T_64BIT)
channel64_writel(dc, CHAR, 0);
channel64_writel(dc, __pad_CHAR, 0);
#else
channel64_writeq(dc, CHAR, 0);
#endif
}
static dma_addr_t channel_read_CHAR(const struct txx9dmac_chan *dc)
{
if (is_dmac64(dc))
return channel64_read_CHAR(dc);
else
return channel32_readl(dc, CHAR);
}
static void channel_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val)
{
if (is_dmac64(dc))
channel64_write_CHAR(dc, val);
else
channel32_writel(dc, CHAR, val);
}
static struct txx9dmac_regs __iomem *__txx9dmac_regs(
const struct txx9dmac_dev *ddev)
{
return ddev->regs;
}
static struct txx9dmac_regs32 __iomem *__txx9dmac_regs32(
const struct txx9dmac_dev *ddev)
{
return ddev->regs;
}
#define dma64_readl(ddev, name) \
__raw_readl(&(__txx9dmac_regs(ddev)->name))
#define dma64_writel(ddev, name, val) \
__raw_writel((val), &(__txx9dmac_regs(ddev)->name))
#define dma32_readl(ddev, name) \
__raw_readl(&(__txx9dmac_regs32(ddev)->name))
#define dma32_writel(ddev, name, val) \
__raw_writel((val), &(__txx9dmac_regs32(ddev)->name))
#define dma_readl(ddev, name) \
(__is_dmac64(ddev) ? \
dma64_readl(ddev, name) : dma32_readl(ddev, name))
#define dma_writel(ddev, name, val) \
(__is_dmac64(ddev) ? \
dma64_writel(ddev, name, val) : dma32_writel(ddev, name, val))
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static struct device *chan2parent(struct dma_chan *chan)
{
return chan->dev->device.parent;
}
static struct txx9dmac_desc *
txd_to_txx9dmac_desc(struct dma_async_tx_descriptor *txd)
{
return container_of(txd, struct txx9dmac_desc, txd);
}
static dma_addr_t desc_read_CHAR(const struct txx9dmac_chan *dc,
const struct txx9dmac_desc *desc)
{
return is_dmac64(dc) ? desc->hwdesc.CHAR : desc->hwdesc32.CHAR;
}
static void desc_write_CHAR(const struct txx9dmac_chan *dc,
struct txx9dmac_desc *desc, dma_addr_t val)
{
if (is_dmac64(dc))
desc->hwdesc.CHAR = val;
else
desc->hwdesc32.CHAR = val;
}
#define TXX9_DMA_MAX_COUNT 0x04000000
#define TXX9_DMA_INITIAL_DESC_COUNT 64
static struct txx9dmac_desc *txx9dmac_first_active(struct txx9dmac_chan *dc)
{
return list_entry(dc->active_list.next,
struct txx9dmac_desc, desc_node);
}
static struct txx9dmac_desc *txx9dmac_last_active(struct txx9dmac_chan *dc)
{
return list_entry(dc->active_list.prev,
struct txx9dmac_desc, desc_node);
}
static struct txx9dmac_desc *txx9dmac_first_queued(struct txx9dmac_chan *dc)
{
return list_entry(dc->queue.next, struct txx9dmac_desc, desc_node);
}
static struct txx9dmac_desc *txx9dmac_last_child(struct txx9dmac_desc *desc)
{
if (!list_empty(&desc->tx_list))
desc = list_entry(desc->tx_list.prev, typeof(*desc), desc_node);
return desc;
}
static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx);
static struct txx9dmac_desc *txx9dmac_desc_alloc(struct txx9dmac_chan *dc,
gfp_t flags)
{
struct txx9dmac_dev *ddev = dc->ddev;
struct txx9dmac_desc *desc;
desc = kzalloc(sizeof(*desc), flags);
if (!desc)
return NULL;
INIT_LIST_HEAD(&desc->tx_list);
dma_async_tx_descriptor_init(&desc->txd, &dc->chan);
desc->txd.tx_submit = txx9dmac_tx_submit;
/* txd.flags will be overwritten in prep funcs */
desc->txd.flags = DMA_CTRL_ACK;
desc->txd.phys = dma_map_single(chan2parent(&dc->chan), &desc->hwdesc,
ddev->descsize, DMA_TO_DEVICE);
return desc;
}
static struct txx9dmac_desc *txx9dmac_desc_get(struct txx9dmac_chan *dc)
{
struct txx9dmac_desc *desc, *_desc;
struct txx9dmac_desc *ret = NULL;
unsigned int i = 0;
spin_lock_bh(&dc->lock);
list_for_each_entry_safe(desc, _desc, &dc->free_list, desc_node) {
if (async_tx_test_ack(&desc->txd)) {
list_del(&desc->desc_node);
ret = desc;
break;
}
dev_dbg(chan2dev(&dc->chan), "desc %p not ACKed\n", desc);
i++;
}
spin_unlock_bh(&dc->lock);
dev_vdbg(chan2dev(&dc->chan), "scanned %u descriptors on freelist\n",
i);
if (!ret) {
ret = txx9dmac_desc_alloc(dc, GFP_ATOMIC);
if (ret) {
spin_lock_bh(&dc->lock);
dc->descs_allocated++;
spin_unlock_bh(&dc->lock);
} else
dev_err(chan2dev(&dc->chan),
"not enough descriptors available\n");
}
return ret;
}
static void txx9dmac_sync_desc_for_cpu(struct txx9dmac_chan *dc,
struct txx9dmac_desc *desc)
{
struct txx9dmac_dev *ddev = dc->ddev;
struct txx9dmac_desc *child;
list_for_each_entry(child, &desc->tx_list, desc_node)
dma_sync_single_for_cpu(chan2parent(&dc->chan),
child->txd.phys, ddev->descsize,
DMA_TO_DEVICE);
dma_sync_single_for_cpu(chan2parent(&dc->chan),
desc->txd.phys, ddev->descsize,
DMA_TO_DEVICE);
}
/*
* Move a descriptor, including any children, to the free list.
* `desc' must not be on any lists.
*/
static void txx9dmac_desc_put(struct txx9dmac_chan *dc,
struct txx9dmac_desc *desc)
{
if (desc) {
struct txx9dmac_desc *child;
txx9dmac_sync_desc_for_cpu(dc, desc);
spin_lock_bh(&dc->lock);
list_for_each_entry(child, &desc->tx_list, desc_node)
dev_vdbg(chan2dev(&dc->chan),
"moving child desc %p to freelist\n",
child);
list_splice_init(&desc->tx_list, &dc->free_list);
dev_vdbg(chan2dev(&dc->chan), "moving desc %p to freelist\n",
desc);
list_add(&desc->desc_node, &dc->free_list);
spin_unlock_bh(&dc->lock);
}
}
/*----------------------------------------------------------------------*/
static void txx9dmac_dump_regs(struct txx9dmac_chan *dc)
{
if (is_dmac64(dc))
dev_err(chan2dev(&dc->chan),
" CHAR: %#llx SAR: %#llx DAR: %#llx CNTR: %#x"
" SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n",
(u64)channel64_read_CHAR(dc),
channel64_readq(dc, SAR),
channel64_readq(dc, DAR),
channel64_readl(dc, CNTR),
channel64_readl(dc, SAIR),
channel64_readl(dc, DAIR),
channel64_readl(dc, CCR),
channel64_readl(dc, CSR));
else
dev_err(chan2dev(&dc->chan),
" CHAR: %#x SAR: %#x DAR: %#x CNTR: %#x"
" SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n",
channel32_readl(dc, CHAR),
channel32_readl(dc, SAR),
channel32_readl(dc, DAR),
channel32_readl(dc, CNTR),
channel32_readl(dc, SAIR),
channel32_readl(dc, DAIR),
channel32_readl(dc, CCR),
channel32_readl(dc, CSR));
}
static void txx9dmac_reset_chan(struct txx9dmac_chan *dc)
{
channel_writel(dc, CCR, TXX9_DMA_CCR_CHRST);
if (is_dmac64(dc)) {
channel64_clear_CHAR(dc);
channel_writeq(dc, SAR, 0);
channel_writeq(dc, DAR, 0);
} else {
channel_writel(dc, CHAR, 0);
channel_writel(dc, SAR, 0);
channel_writel(dc, DAR, 0);
}
channel_writel(dc, CNTR, 0);
channel_writel(dc, SAIR, 0);
channel_writel(dc, DAIR, 0);
channel_writel(dc, CCR, 0);
}
/* Called with dc->lock held and bh disabled */
static void txx9dmac_dostart(struct txx9dmac_chan *dc,
struct txx9dmac_desc *first)
{
struct txx9dmac_slave *ds = dc->chan.private;
u32 sai, dai;
dev_vdbg(chan2dev(&dc->chan), "dostart %u %p\n",
first->txd.cookie, first);
/* ASSERT: channel is idle */
if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) {
dev_err(chan2dev(&dc->chan),
"BUG: Attempted to start non-idle channel\n");
txx9dmac_dump_regs(dc);
/* The tasklet will hopefully advance the queue... */
return;
}
if (is_dmac64(dc)) {
channel64_writel(dc, CNTR, 0);
channel64_writel(dc, CSR, 0xffffffff);
if (ds) {
if (ds->tx_reg) {
sai = ds->reg_width;
dai = 0;
} else {
sai = 0;
dai = ds->reg_width;
}
} else {
sai = 8;
dai = 8;
}
channel64_writel(dc, SAIR, sai);
channel64_writel(dc, DAIR, dai);
/* All 64-bit DMAC supports SMPCHN */
channel64_writel(dc, CCR, dc->ccr);
/* Writing a non zero value to CHAR will assert XFACT */
channel64_write_CHAR(dc, first->txd.phys);
} else {
channel32_writel(dc, CNTR, 0);
channel32_writel(dc, CSR, 0xffffffff);
if (ds) {
if (ds->tx_reg) {
sai = ds->reg_width;
dai = 0;
} else {
sai = 0;
dai = ds->reg_width;
}
} else {
sai = 4;
dai = 4;
}
channel32_writel(dc, SAIR, sai);
channel32_writel(dc, DAIR, dai);
if (txx9_dma_have_SMPCHN()) {
channel32_writel(dc, CCR, dc->ccr);
/* Writing a non zero value to CHAR will assert XFACT */
channel32_writel(dc, CHAR, first->txd.phys);
} else {
channel32_writel(dc, CHAR, first->txd.phys);
channel32_writel(dc, CCR, dc->ccr);
}
}
}
/*----------------------------------------------------------------------*/
static void
txx9dmac_descriptor_complete(struct txx9dmac_chan *dc,
struct txx9dmac_desc *desc)
{
struct dmaengine_desc_callback cb;
struct dma_async_tx_descriptor *txd = &desc->txd;
dev_vdbg(chan2dev(&dc->chan), "descriptor %u %p complete\n",
txd->cookie, desc);
dma_cookie_complete(txd);
dmaengine_desc_get_callback(txd, &cb);
txx9dmac_sync_desc_for_cpu(dc, desc);
list_splice_init(&desc->tx_list, &dc->free_list);
list_move(&desc->desc_node, &dc->free_list);
dma_descriptor_unmap(txd);
/*
* The API requires that no submissions are done from a
* callback, so we don't need to drop the lock here
*/
dmaengine_desc_callback_invoke(&cb, NULL);
dma_run_dependencies(txd);
}
static void txx9dmac_dequeue(struct txx9dmac_chan *dc, struct list_head *list)
{
struct txx9dmac_dev *ddev = dc->ddev;
struct txx9dmac_desc *desc;
struct txx9dmac_desc *prev = NULL;
BUG_ON(!list_empty(list));
do {
desc = txx9dmac_first_queued(dc);
if (prev) {
desc_write_CHAR(dc, prev, desc->txd.phys);
dma_sync_single_for_device(chan2parent(&dc->chan),
prev->txd.phys, ddev->descsize,
DMA_TO_DEVICE);
}
prev = txx9dmac_last_child(desc);
list_move_tail(&desc->desc_node, list);
/* Make chain-completion interrupt happen */
if ((desc->txd.flags & DMA_PREP_INTERRUPT) &&
!txx9dmac_chan_INTENT(dc))
break;
} while (!list_empty(&dc->queue));
}
static void txx9dmac_complete_all(struct txx9dmac_chan *dc)
{
struct txx9dmac_desc *desc, *_desc;
LIST_HEAD(list);
/*
* Submit queued descriptors ASAP, i.e. before we go through
* the completed ones.
*/
list_splice_init(&dc->active_list, &list);
if (!list_empty(&dc->queue)) {
txx9dmac_dequeue(dc, &dc->active_list);
txx9dmac_dostart(dc, txx9dmac_first_active(dc));
}
list_for_each_entry_safe(desc, _desc, &list, desc_node)
txx9dmac_descriptor_complete(dc, desc);
}
static void txx9dmac_dump_desc(struct txx9dmac_chan *dc,
struct txx9dmac_hwdesc *desc)
{
if (is_dmac64(dc)) {
#ifdef TXX9_DMA_USE_SIMPLE_CHAIN
dev_crit(chan2dev(&dc->chan),
" desc: ch%#llx s%#llx d%#llx c%#x\n",
(u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR);
#else
dev_crit(chan2dev(&dc->chan),
" desc: ch%#llx s%#llx d%#llx c%#x"
" si%#x di%#x cc%#x cs%#x\n",
(u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR,
desc->SAIR, desc->DAIR, desc->CCR, desc->CSR);
#endif
} else {
struct txx9dmac_hwdesc32 *d = (struct txx9dmac_hwdesc32 *)desc;
#ifdef TXX9_DMA_USE_SIMPLE_CHAIN
dev_crit(chan2dev(&dc->chan),
" desc: ch%#x s%#x d%#x c%#x\n",
d->CHAR, d->SAR, d->DAR, d->CNTR);
#else
dev_crit(chan2dev(&dc->chan),
" desc: ch%#x s%#x d%#x c%#x"
" si%#x di%#x cc%#x cs%#x\n",
d->CHAR, d->SAR, d->DAR, d->CNTR,
d->SAIR, d->DAIR, d->CCR, d->CSR);
#endif
}
}
static void txx9dmac_handle_error(struct txx9dmac_chan *dc, u32 csr)
{
struct txx9dmac_desc *bad_desc;
struct txx9dmac_desc *child;
u32 errors;
/*
* The descriptor currently at the head of the active list is
* borked. Since we don't have any way to report errors, we'll
* just have to scream loudly and try to carry on.
*/
dev_crit(chan2dev(&dc->chan), "Abnormal Chain Completion\n");
txx9dmac_dump_regs(dc);
bad_desc = txx9dmac_first_active(dc);
list_del_init(&bad_desc->desc_node);
/* Clear all error flags and try to restart the controller */
errors = csr & (TXX9_DMA_CSR_ABCHC |
TXX9_DMA_CSR_CFERR | TXX9_DMA_CSR_CHERR |
TXX9_DMA_CSR_DESERR | TXX9_DMA_CSR_SORERR);
channel_writel(dc, CSR, errors);
if (list_empty(&dc->active_list) && !list_empty(&dc->queue))
txx9dmac_dequeue(dc, &dc->active_list);
if (!list_empty(&dc->active_list))
txx9dmac_dostart(dc, txx9dmac_first_active(dc));
dev_crit(chan2dev(&dc->chan),
"Bad descriptor submitted for DMA! (cookie: %d)\n",
bad_desc->txd.cookie);
txx9dmac_dump_desc(dc, &bad_desc->hwdesc);
list_for_each_entry(child, &bad_desc->tx_list, desc_node)
txx9dmac_dump_desc(dc, &child->hwdesc);
/* Pretend the descriptor completed successfully */
txx9dmac_descriptor_complete(dc, bad_desc);
}
static void txx9dmac_scan_descriptors(struct txx9dmac_chan *dc)
{
dma_addr_t chain;
struct txx9dmac_desc *desc, *_desc;
struct txx9dmac_desc *child;
u32 csr;
if (is_dmac64(dc)) {
chain = channel64_read_CHAR(dc);
csr = channel64_readl(dc, CSR);
channel64_writel(dc, CSR, csr);
} else {
chain = channel32_readl(dc, CHAR);
csr = channel32_readl(dc, CSR);
channel32_writel(dc, CSR, csr);
}
/* For dynamic chain, we should look at XFACT instead of NCHNC */
if (!(csr & (TXX9_DMA_CSR_XFACT | TXX9_DMA_CSR_ABCHC))) {
/* Everything we've submitted is done */
txx9dmac_complete_all(dc);
return;
}
if (!(csr & TXX9_DMA_CSR_CHNEN))
chain = 0; /* last descriptor of this chain */
dev_vdbg(chan2dev(&dc->chan), "scan_descriptors: char=%#llx\n",
(u64)chain);
list_for_each_entry_safe(desc, _desc, &dc->active_list, desc_node) {
if (desc_read_CHAR(dc, desc) == chain) {
/* This one is currently in progress */
if (csr & TXX9_DMA_CSR_ABCHC)
goto scan_done;
return;
}
list_for_each_entry(child, &desc->tx_list, desc_node)
if (desc_read_CHAR(dc, child) == chain) {
/* Currently in progress */
if (csr & TXX9_DMA_CSR_ABCHC)
goto scan_done;
return;
}
/*
* No descriptors so far seem to be in progress, i.e.
* this one must be done.
*/
txx9dmac_descriptor_complete(dc, desc);
}
scan_done:
if (csr & TXX9_DMA_CSR_ABCHC) {
txx9dmac_handle_error(dc, csr);
return;
}
dev_err(chan2dev(&dc->chan),
"BUG: All descriptors done, but channel not idle!\n");
/* Try to continue after resetting the channel... */
txx9dmac_reset_chan(dc);
if (!list_empty(&dc->queue)) {
txx9dmac_dequeue(dc, &dc->active_list);
txx9dmac_dostart(dc, txx9dmac_first_active(dc));
}
}
static void txx9dmac_chan_tasklet(struct tasklet_struct *t)
{
int irq;
u32 csr;
struct txx9dmac_chan *dc;
dc = from_tasklet(dc, t, tasklet);
csr = channel_readl(dc, CSR);
dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n", csr);
spin_lock(&dc->lock);
if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC |
TXX9_DMA_CSR_NTRNFC))
txx9dmac_scan_descriptors(dc);
spin_unlock(&dc->lock);
irq = dc->irq;
enable_irq(irq);
}
static irqreturn_t txx9dmac_chan_interrupt(int irq, void *dev_id)
{
struct txx9dmac_chan *dc = dev_id;
dev_vdbg(chan2dev(&dc->chan), "interrupt: status=%#x\n",
channel_readl(dc, CSR));
tasklet_schedule(&dc->tasklet);
/*
* Just disable the interrupts. We'll turn them back on in the
* softirq handler.
*/
disable_irq_nosync(irq);
return IRQ_HANDLED;
}
static void txx9dmac_tasklet(struct tasklet_struct *t)
{
int irq;
u32 csr;
struct txx9dmac_chan *dc;
struct txx9dmac_dev *ddev = from_tasklet(ddev, t, tasklet);
u32 mcr;
int i;
mcr = dma_readl(ddev, MCR);
dev_vdbg(ddev->chan[0]->dma.dev, "tasklet: mcr=%x\n", mcr);
for (i = 0; i < TXX9_DMA_MAX_NR_CHANNELS; i++) {
if ((mcr >> (24 + i)) & 0x11) {
dc = ddev->chan[i];
csr = channel_readl(dc, CSR);
dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n",
csr);
spin_lock(&dc->lock);
if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC |
TXX9_DMA_CSR_NTRNFC))
txx9dmac_scan_descriptors(dc);
spin_unlock(&dc->lock);
}
}
irq = ddev->irq;
enable_irq(irq);
}
static irqreturn_t txx9dmac_interrupt(int irq, void *dev_id)
{
struct txx9dmac_dev *ddev = dev_id;
dev_vdbg(ddev->chan[0]->dma.dev, "interrupt: status=%#x\n",
dma_readl(ddev, MCR));
tasklet_schedule(&ddev->tasklet);
/*
* Just disable the interrupts. We'll turn them back on in the
* softirq handler.
*/
disable_irq_nosync(irq);
return IRQ_HANDLED;
}
/*----------------------------------------------------------------------*/
static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct txx9dmac_desc *desc = txd_to_txx9dmac_desc(tx);
struct txx9dmac_chan *dc = to_txx9dmac_chan(tx->chan);
dma_cookie_t cookie;
spin_lock_bh(&dc->lock);
cookie = dma_cookie_assign(tx);
dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u %p\n",
desc->txd.cookie, desc);
list_add_tail(&desc->desc_node, &dc->queue);
spin_unlock_bh(&dc->lock);
return cookie;
}
static struct dma_async_tx_descriptor *
txx9dmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
struct txx9dmac_dev *ddev = dc->ddev;
struct txx9dmac_desc *desc;
struct txx9dmac_desc *first;
struct txx9dmac_desc *prev;
size_t xfer_count;
size_t offset;
dev_vdbg(chan2dev(chan), "prep_dma_memcpy d%#llx s%#llx l%#zx f%#lx\n",
(u64)dest, (u64)src, len, flags);
if (unlikely(!len)) {
dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n");
return NULL;
}
prev = first = NULL;
for (offset = 0; offset < len; offset += xfer_count) {
xfer_count = min_t(size_t, len - offset, TXX9_DMA_MAX_COUNT);
/*
* Workaround for ERT-TX49H2-033, ERT-TX49H3-020,
* ERT-TX49H4-016 (slightly conservative)
*/
if (__is_dmac64(ddev)) {
if (xfer_count > 0x100 &&
(xfer_count & 0xff) >= 0xfa &&
(xfer_count & 0xff) <= 0xff)
xfer_count -= 0x20;
} else {
if (xfer_count > 0x80 &&
(xfer_count & 0x7f) >= 0x7e &&
(xfer_count & 0x7f) <= 0x7f)
xfer_count -= 0x20;
}
desc = txx9dmac_desc_get(dc);
if (!desc) {
txx9dmac_desc_put(dc, first);
return NULL;
}
if (__is_dmac64(ddev)) {
desc->hwdesc.SAR = src + offset;
desc->hwdesc.DAR = dest + offset;
desc->hwdesc.CNTR = xfer_count;
txx9dmac_desc_set_nosimple(ddev, desc, 8, 8,
dc->ccr | TXX9_DMA_CCR_XFACT);
} else {
desc->hwdesc32.SAR = src + offset;
desc->hwdesc32.DAR = dest + offset;
desc->hwdesc32.CNTR = xfer_count;
txx9dmac_desc_set_nosimple(ddev, desc, 4, 4,
dc->ccr | TXX9_DMA_CCR_XFACT);
}
/*
* The descriptors on tx_list are not reachable from
* the dc->queue list or dc->active_list after a
* submit. If we put all descriptors on active_list,
* calling of callback on the completion will be more
* complex.
*/
if (!first) {
first = desc;
} else {
desc_write_CHAR(dc, prev, desc->txd.phys);
dma_sync_single_for_device(chan2parent(&dc->chan),
prev->txd.phys, ddev->descsize,
DMA_TO_DEVICE);
list_add_tail(&desc->desc_node, &first->tx_list);
}
prev = desc;
}
/* Trigger interrupt after last block */
if (flags & DMA_PREP_INTERRUPT)
txx9dmac_desc_set_INTENT(ddev, prev);
desc_write_CHAR(dc, prev, 0);
dma_sync_single_for_device(chan2parent(&dc->chan),
prev->txd.phys, ddev->descsize,
DMA_TO_DEVICE);
first->txd.flags = flags;
first->len = len;
return &first->txd;
}
static struct dma_async_tx_descriptor *
txx9dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
struct txx9dmac_dev *ddev = dc->ddev;
struct txx9dmac_slave *ds = chan->private;
struct txx9dmac_desc *prev;
struct txx9dmac_desc *first;
unsigned int i;
struct scatterlist *sg;
dev_vdbg(chan2dev(chan), "prep_dma_slave\n");
BUG_ON(!ds || !ds->reg_width);
if (ds->tx_reg)
BUG_ON(direction != DMA_MEM_TO_DEV);
else
BUG_ON(direction != DMA_DEV_TO_MEM);
if (unlikely(!sg_len))
return NULL;
prev = first = NULL;
for_each_sg(sgl, sg, sg_len, i) {
struct txx9dmac_desc *desc;
dma_addr_t mem;
u32 sai, dai;
desc = txx9dmac_desc_get(dc);
if (!desc) {
txx9dmac_desc_put(dc, first);
return NULL;
}
mem = sg_dma_address(sg);
if (__is_dmac64(ddev)) {
if (direction == DMA_MEM_TO_DEV) {
desc->hwdesc.SAR = mem;
desc->hwdesc.DAR = ds->tx_reg;
} else {
desc->hwdesc.SAR = ds->rx_reg;
desc->hwdesc.DAR = mem;
}
desc->hwdesc.CNTR = sg_dma_len(sg);
} else {
if (direction == DMA_MEM_TO_DEV) {
desc->hwdesc32.SAR = mem;
desc->hwdesc32.DAR = ds->tx_reg;
} else {
desc->hwdesc32.SAR = ds->rx_reg;
desc->hwdesc32.DAR = mem;
}
desc->hwdesc32.CNTR = sg_dma_len(sg);
}
if (direction == DMA_MEM_TO_DEV) {
sai = ds->reg_width;
dai = 0;
} else {
sai = 0;
dai = ds->reg_width;
}
txx9dmac_desc_set_nosimple(ddev, desc, sai, dai,
dc->ccr | TXX9_DMA_CCR_XFACT);
if (!first) {
first = desc;
} else {
desc_write_CHAR(dc, prev, desc->txd.phys);
dma_sync_single_for_device(chan2parent(&dc->chan),
prev->txd.phys,
ddev->descsize,
DMA_TO_DEVICE);
list_add_tail(&desc->desc_node, &first->tx_list);
}
prev = desc;
}
/* Trigger interrupt after last block */
if (flags & DMA_PREP_INTERRUPT)
txx9dmac_desc_set_INTENT(ddev, prev);
desc_write_CHAR(dc, prev, 0);
dma_sync_single_for_device(chan2parent(&dc->chan),
prev->txd.phys, ddev->descsize,
DMA_TO_DEVICE);
first->txd.flags = flags;
first->len = 0;
return &first->txd;
}
static int txx9dmac_terminate_all(struct dma_chan *chan)
{
struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
struct txx9dmac_desc *desc, *_desc;
LIST_HEAD(list);
dev_vdbg(chan2dev(chan), "terminate_all\n");
spin_lock_bh(&dc->lock);
txx9dmac_reset_chan(dc);
/* active_list entries will end up before queued entries */
list_splice_init(&dc->queue, &list);
list_splice_init(&dc->active_list, &list);
spin_unlock_bh(&dc->lock);
/* Flush all pending and queued descriptors */
list_for_each_entry_safe(desc, _desc, &list, desc_node)
txx9dmac_descriptor_complete(dc, desc);
return 0;
}
static enum dma_status
txx9dmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
enum dma_status ret;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
return DMA_COMPLETE;
spin_lock_bh(&dc->lock);
txx9dmac_scan_descriptors(dc);
spin_unlock_bh(&dc->lock);
return dma_cookie_status(chan, cookie, txstate);
}
static void txx9dmac_chain_dynamic(struct txx9dmac_chan *dc,
struct txx9dmac_desc *prev)
{
struct txx9dmac_dev *ddev = dc->ddev;
struct txx9dmac_desc *desc;
LIST_HEAD(list);
prev = txx9dmac_last_child(prev);
txx9dmac_dequeue(dc, &list);
desc = list_entry(list.next, struct txx9dmac_desc, desc_node);
desc_write_CHAR(dc, prev, desc->txd.phys);
dma_sync_single_for_device(chan2parent(&dc->chan),
prev->txd.phys, ddev->descsize,
DMA_TO_DEVICE);
if (!(channel_readl(dc, CSR) & TXX9_DMA_CSR_CHNEN) &&
channel_read_CHAR(dc) == prev->txd.phys)
/* Restart chain DMA */
channel_write_CHAR(dc, desc->txd.phys);
list_splice_tail(&list, &dc->active_list);
}
static void txx9dmac_issue_pending(struct dma_chan *chan)
{
struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
spin_lock_bh(&dc->lock);
if (!list_empty(&dc->active_list))
txx9dmac_scan_descriptors(dc);
if (!list_empty(&dc->queue)) {
if (list_empty(&dc->active_list)) {
txx9dmac_dequeue(dc, &dc->active_list);
txx9dmac_dostart(dc, txx9dmac_first_active(dc));
} else if (txx9_dma_have_SMPCHN()) {
struct txx9dmac_desc *prev = txx9dmac_last_active(dc);
if (!(prev->txd.flags & DMA_PREP_INTERRUPT) ||
txx9dmac_chan_INTENT(dc))
txx9dmac_chain_dynamic(dc, prev);
}
}
spin_unlock_bh(&dc->lock);
}
static int txx9dmac_alloc_chan_resources(struct dma_chan *chan)
{
struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
struct txx9dmac_slave *ds = chan->private;
struct txx9dmac_desc *desc;
int i;
dev_vdbg(chan2dev(chan), "alloc_chan_resources\n");
/* ASSERT: channel is idle */
if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) {
dev_dbg(chan2dev(chan), "DMA channel not idle?\n");
return -EIO;
}
dma_cookie_init(chan);
dc->ccr = TXX9_DMA_CCR_IMMCHN | TXX9_DMA_CCR_INTENE | CCR_LE;
txx9dmac_chan_set_SMPCHN(dc);
if (!txx9_dma_have_SMPCHN() || (dc->ccr & TXX9_DMA_CCR_SMPCHN))
dc->ccr |= TXX9_DMA_CCR_INTENC;
if (chan->device->device_prep_dma_memcpy) {
if (ds)
return -EINVAL;
dc->ccr |= TXX9_DMA_CCR_XFSZ_X8;
} else {
if (!ds ||
(ds->tx_reg && ds->rx_reg) || (!ds->tx_reg && !ds->rx_reg))
return -EINVAL;
dc->ccr |= TXX9_DMA_CCR_EXTRQ |
TXX9_DMA_CCR_XFSZ(__ffs(ds->reg_width));
txx9dmac_chan_set_INTENT(dc);
}
spin_lock_bh(&dc->lock);
i = dc->descs_allocated;
while (dc->descs_allocated < TXX9_DMA_INITIAL_DESC_COUNT) {
spin_unlock_bh(&dc->lock);
desc = txx9dmac_desc_alloc(dc, GFP_KERNEL);
if (!desc) {
dev_info(chan2dev(chan),
"only allocated %d descriptors\n", i);
spin_lock_bh(&dc->lock);
break;
}
txx9dmac_desc_put(dc, desc);
spin_lock_bh(&dc->lock);
i = ++dc->descs_allocated;
}
spin_unlock_bh(&dc->lock);
dev_dbg(chan2dev(chan),
"alloc_chan_resources allocated %d descriptors\n", i);
return i;
}
static void txx9dmac_free_chan_resources(struct dma_chan *chan)
{
struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
struct txx9dmac_dev *ddev = dc->ddev;
struct txx9dmac_desc *desc, *_desc;
LIST_HEAD(list);
dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n",
dc->descs_allocated);
/* ASSERT: channel is idle */
BUG_ON(!list_empty(&dc->active_list));
BUG_ON(!list_empty(&dc->queue));
BUG_ON(channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT);
spin_lock_bh(&dc->lock);
list_splice_init(&dc->free_list, &list);
dc->descs_allocated = 0;
spin_unlock_bh(&dc->lock);
list_for_each_entry_safe(desc, _desc, &list, desc_node) {
dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc);
dma_unmap_single(chan2parent(chan), desc->txd.phys,
ddev->descsize, DMA_TO_DEVICE);
kfree(desc);
}
dev_vdbg(chan2dev(chan), "free_chan_resources done\n");
}
/*----------------------------------------------------------------------*/
static void txx9dmac_off(struct txx9dmac_dev *ddev)
{
dma_writel(ddev, MCR, 0);
}
static int __init txx9dmac_chan_probe(struct platform_device *pdev)
{
struct txx9dmac_chan_platform_data *cpdata =
dev_get_platdata(&pdev->dev);
struct platform_device *dmac_dev = cpdata->dmac_dev;
struct txx9dmac_platform_data *pdata = dev_get_platdata(&dmac_dev->dev);
struct txx9dmac_chan *dc;
int err;
int ch = pdev->id % TXX9_DMA_MAX_NR_CHANNELS;
int irq;
dc = devm_kzalloc(&pdev->dev, sizeof(*dc), GFP_KERNEL);
if (!dc)
return -ENOMEM;
dc->dma.dev = &pdev->dev;
dc->dma.device_alloc_chan_resources = txx9dmac_alloc_chan_resources;
dc->dma.device_free_chan_resources = txx9dmac_free_chan_resources;
dc->dma.device_terminate_all = txx9dmac_terminate_all;
dc->dma.device_tx_status = txx9dmac_tx_status;
dc->dma.device_issue_pending = txx9dmac_issue_pending;
if (pdata && pdata->memcpy_chan == ch) {
dc->dma.device_prep_dma_memcpy = txx9dmac_prep_dma_memcpy;
dma_cap_set(DMA_MEMCPY, dc->dma.cap_mask);
} else {
dc->dma.device_prep_slave_sg = txx9dmac_prep_slave_sg;
dma_cap_set(DMA_SLAVE, dc->dma.cap_mask);
dma_cap_set(DMA_PRIVATE, dc->dma.cap_mask);
}
INIT_LIST_HEAD(&dc->dma.channels);
dc->ddev = platform_get_drvdata(dmac_dev);
if (dc->ddev->irq < 0) {
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
tasklet_setup(&dc->tasklet, txx9dmac_chan_tasklet);
dc->irq = irq;
err = devm_request_irq(&pdev->dev, dc->irq,
txx9dmac_chan_interrupt, 0, dev_name(&pdev->dev), dc);
if (err)
return err;
} else
dc->irq = -1;
dc->ddev->chan[ch] = dc;
dc->chan.device = &dc->dma;
list_add_tail(&dc->chan.device_node, &dc->chan.device->channels);
dma_cookie_init(&dc->chan);
if (is_dmac64(dc))
dc->ch_regs = &__txx9dmac_regs(dc->ddev)->CHAN[ch];
else
dc->ch_regs = &__txx9dmac_regs32(dc->ddev)->CHAN[ch];
spin_lock_init(&dc->lock);
INIT_LIST_HEAD(&dc->active_list);
INIT_LIST_HEAD(&dc->queue);
INIT_LIST_HEAD(&dc->free_list);
txx9dmac_reset_chan(dc);
platform_set_drvdata(pdev, dc);
err = dma_async_device_register(&dc->dma);
if (err)
return err;
dev_dbg(&pdev->dev, "TXx9 DMA Channel (dma%d%s%s)\n",
dc->dma.dev_id,
dma_has_cap(DMA_MEMCPY, dc->dma.cap_mask) ? " memcpy" : "",
dma_has_cap(DMA_SLAVE, dc->dma.cap_mask) ? " slave" : "");
return 0;
}
static int txx9dmac_chan_remove(struct platform_device *pdev)
{
struct txx9dmac_chan *dc = platform_get_drvdata(pdev);
dma_async_device_unregister(&dc->dma);
if (dc->irq >= 0) {
devm_free_irq(&pdev->dev, dc->irq, dc);
tasklet_kill(&dc->tasklet);
}
dc->ddev->chan[pdev->id % TXX9_DMA_MAX_NR_CHANNELS] = NULL;
return 0;
}
static int __init txx9dmac_probe(struct platform_device *pdev)
{
struct txx9dmac_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct resource *io;
struct txx9dmac_dev *ddev;
u32 mcr;
int err;
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!io)
return -EINVAL;
ddev = devm_kzalloc(&pdev->dev, sizeof(*ddev), GFP_KERNEL);
if (!ddev)
return -ENOMEM;
if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io),
dev_name(&pdev->dev)))
return -EBUSY;
ddev->regs = devm_ioremap(&pdev->dev, io->start, resource_size(io));
if (!ddev->regs)
return -ENOMEM;
ddev->have_64bit_regs = pdata->have_64bit_regs;
if (__is_dmac64(ddev))
ddev->descsize = sizeof(struct txx9dmac_hwdesc);
else
ddev->descsize = sizeof(struct txx9dmac_hwdesc32);
/* force dma off, just in case */
txx9dmac_off(ddev);
ddev->irq = platform_get_irq(pdev, 0);
if (ddev->irq >= 0) {
tasklet_setup(&ddev->tasklet, txx9dmac_tasklet);
err = devm_request_irq(&pdev->dev, ddev->irq,
txx9dmac_interrupt, 0, dev_name(&pdev->dev), ddev);
if (err)
return err;
}
mcr = TXX9_DMA_MCR_MSTEN | MCR_LE;
if (pdata && pdata->memcpy_chan >= 0)
mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan);
dma_writel(ddev, MCR, mcr);
platform_set_drvdata(pdev, ddev);
return 0;
}
static int txx9dmac_remove(struct platform_device *pdev)
{
struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
txx9dmac_off(ddev);
if (ddev->irq >= 0) {
devm_free_irq(&pdev->dev, ddev->irq, ddev);
tasklet_kill(&ddev->tasklet);
}
return 0;
}
static void txx9dmac_shutdown(struct platform_device *pdev)
{
struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
txx9dmac_off(ddev);
}
static int txx9dmac_suspend_noirq(struct device *dev)
{
struct txx9dmac_dev *ddev = dev_get_drvdata(dev);
txx9dmac_off(ddev);
return 0;
}
static int txx9dmac_resume_noirq(struct device *dev)
{
struct txx9dmac_dev *ddev = dev_get_drvdata(dev);
struct txx9dmac_platform_data *pdata = dev_get_platdata(dev);
u32 mcr;
mcr = TXX9_DMA_MCR_MSTEN | MCR_LE;
if (pdata && pdata->memcpy_chan >= 0)
mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan);
dma_writel(ddev, MCR, mcr);
return 0;
}
static const struct dev_pm_ops txx9dmac_dev_pm_ops = {
.suspend_noirq = txx9dmac_suspend_noirq,
.resume_noirq = txx9dmac_resume_noirq,
};
static struct platform_driver txx9dmac_chan_driver = {
.remove = txx9dmac_chan_remove,
.driver = {
.name = "txx9dmac-chan",
},
};
static struct platform_driver txx9dmac_driver = {
.remove = txx9dmac_remove,
.shutdown = txx9dmac_shutdown,
.driver = {
.name = "txx9dmac",
.pm = &txx9dmac_dev_pm_ops,
},
};
static int __init txx9dmac_init(void)
{
int rc;
rc = platform_driver_probe(&txx9dmac_driver, txx9dmac_probe);
if (!rc) {
rc = platform_driver_probe(&txx9dmac_chan_driver,
txx9dmac_chan_probe);
if (rc)
platform_driver_unregister(&txx9dmac_driver);
}
return rc;
}
module_init(txx9dmac_init);
static void __exit txx9dmac_exit(void)
{
platform_driver_unregister(&txx9dmac_chan_driver);
platform_driver_unregister(&txx9dmac_driver);
}
module_exit(txx9dmac_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("TXx9 DMA Controller driver");
MODULE_AUTHOR("Atsushi Nemoto <[email protected]>");
MODULE_ALIAS("platform:txx9dmac");
MODULE_ALIAS("platform:txx9dmac-chan");
| linux-master | drivers/dma/txx9dmac.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* SA11x0 DMAengine support
*
* Copyright (C) 2012 Russell King
* Derived in part from arch/arm/mach-sa1100/dma.c,
* Copyright (C) 2000, 2001 by Nicolas Pitre
*/
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include "virt-dma.h"
#define NR_PHY_CHAN 6
#define DMA_ALIGN 3
#define DMA_MAX_SIZE 0x1fff
#define DMA_CHUNK_SIZE 0x1000
#define DMA_DDAR 0x00
#define DMA_DCSR_S 0x04
#define DMA_DCSR_C 0x08
#define DMA_DCSR_R 0x0c
#define DMA_DBSA 0x10
#define DMA_DBTA 0x14
#define DMA_DBSB 0x18
#define DMA_DBTB 0x1c
#define DMA_SIZE 0x20
#define DCSR_RUN (1 << 0)
#define DCSR_IE (1 << 1)
#define DCSR_ERROR (1 << 2)
#define DCSR_DONEA (1 << 3)
#define DCSR_STRTA (1 << 4)
#define DCSR_DONEB (1 << 5)
#define DCSR_STRTB (1 << 6)
#define DCSR_BIU (1 << 7)
#define DDAR_RW (1 << 0) /* 0 = W, 1 = R */
#define DDAR_E (1 << 1) /* 0 = LE, 1 = BE */
#define DDAR_BS (1 << 2) /* 0 = BS4, 1 = BS8 */
#define DDAR_DW (1 << 3) /* 0 = 8b, 1 = 16b */
#define DDAR_Ser0UDCTr (0x0 << 4)
#define DDAR_Ser0UDCRc (0x1 << 4)
#define DDAR_Ser1SDLCTr (0x2 << 4)
#define DDAR_Ser1SDLCRc (0x3 << 4)
#define DDAR_Ser1UARTTr (0x4 << 4)
#define DDAR_Ser1UARTRc (0x5 << 4)
#define DDAR_Ser2ICPTr (0x6 << 4)
#define DDAR_Ser2ICPRc (0x7 << 4)
#define DDAR_Ser3UARTTr (0x8 << 4)
#define DDAR_Ser3UARTRc (0x9 << 4)
#define DDAR_Ser4MCP0Tr (0xa << 4)
#define DDAR_Ser4MCP0Rc (0xb << 4)
#define DDAR_Ser4MCP1Tr (0xc << 4)
#define DDAR_Ser4MCP1Rc (0xd << 4)
#define DDAR_Ser4SSPTr (0xe << 4)
#define DDAR_Ser4SSPRc (0xf << 4)
struct sa11x0_dma_sg {
u32 addr;
u32 len;
};
struct sa11x0_dma_desc {
struct virt_dma_desc vd;
u32 ddar;
size_t size;
unsigned period;
bool cyclic;
unsigned sglen;
struct sa11x0_dma_sg sg[];
};
struct sa11x0_dma_phy;
struct sa11x0_dma_chan {
struct virt_dma_chan vc;
/* protected by c->vc.lock */
struct sa11x0_dma_phy *phy;
enum dma_status status;
/* protected by d->lock */
struct list_head node;
u32 ddar;
const char *name;
};
struct sa11x0_dma_phy {
void __iomem *base;
struct sa11x0_dma_dev *dev;
unsigned num;
struct sa11x0_dma_chan *vchan;
/* Protected by c->vc.lock */
unsigned sg_load;
struct sa11x0_dma_desc *txd_load;
unsigned sg_done;
struct sa11x0_dma_desc *txd_done;
u32 dbs[2];
u32 dbt[2];
u32 dcsr;
};
struct sa11x0_dma_dev {
struct dma_device slave;
void __iomem *base;
spinlock_t lock;
struct tasklet_struct task;
struct list_head chan_pending;
struct sa11x0_dma_phy phy[NR_PHY_CHAN];
};
static struct sa11x0_dma_chan *to_sa11x0_dma_chan(struct dma_chan *chan)
{
return container_of(chan, struct sa11x0_dma_chan, vc.chan);
}
static struct sa11x0_dma_dev *to_sa11x0_dma(struct dma_device *dmadev)
{
return container_of(dmadev, struct sa11x0_dma_dev, slave);
}
static struct sa11x0_dma_desc *sa11x0_dma_next_desc(struct sa11x0_dma_chan *c)
{
struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
return vd ? container_of(vd, struct sa11x0_dma_desc, vd) : NULL;
}
static void sa11x0_dma_free_desc(struct virt_dma_desc *vd)
{
kfree(container_of(vd, struct sa11x0_dma_desc, vd));
}
static void sa11x0_dma_start_desc(struct sa11x0_dma_phy *p, struct sa11x0_dma_desc *txd)
{
list_del(&txd->vd.node);
p->txd_load = txd;
p->sg_load = 0;
dev_vdbg(p->dev->slave.dev, "pchan %u: txd %p[%x]: starting: DDAR:%x\n",
p->num, &txd->vd, txd->vd.tx.cookie, txd->ddar);
}
static void noinline sa11x0_dma_start_sg(struct sa11x0_dma_phy *p,
struct sa11x0_dma_chan *c)
{
struct sa11x0_dma_desc *txd = p->txd_load;
struct sa11x0_dma_sg *sg;
void __iomem *base = p->base;
unsigned dbsx, dbtx;
u32 dcsr;
if (!txd)
return;
dcsr = readl_relaxed(base + DMA_DCSR_R);
/* Don't try to load the next transfer if both buffers are started */
if ((dcsr & (DCSR_STRTA | DCSR_STRTB)) == (DCSR_STRTA | DCSR_STRTB))
return;
if (p->sg_load == txd->sglen) {
if (!txd->cyclic) {
struct sa11x0_dma_desc *txn = sa11x0_dma_next_desc(c);
/*
* We have reached the end of the current descriptor.
* Peek at the next descriptor, and if compatible with
* the current, start processing it.
*/
if (txn && txn->ddar == txd->ddar) {
txd = txn;
sa11x0_dma_start_desc(p, txn);
} else {
p->txd_load = NULL;
return;
}
} else {
/* Cyclic: reset back to beginning */
p->sg_load = 0;
}
}
sg = &txd->sg[p->sg_load++];
/* Select buffer to load according to channel status */
if (((dcsr & (DCSR_BIU | DCSR_STRTB)) == (DCSR_BIU | DCSR_STRTB)) ||
((dcsr & (DCSR_BIU | DCSR_STRTA)) == 0)) {
dbsx = DMA_DBSA;
dbtx = DMA_DBTA;
dcsr = DCSR_STRTA | DCSR_IE | DCSR_RUN;
} else {
dbsx = DMA_DBSB;
dbtx = DMA_DBTB;
dcsr = DCSR_STRTB | DCSR_IE | DCSR_RUN;
}
writel_relaxed(sg->addr, base + dbsx);
writel_relaxed(sg->len, base + dbtx);
writel(dcsr, base + DMA_DCSR_S);
dev_dbg(p->dev->slave.dev, "pchan %u: load: DCSR:%02x DBS%c:%08x DBT%c:%08x\n",
p->num, dcsr,
'A' + (dbsx == DMA_DBSB), sg->addr,
'A' + (dbtx == DMA_DBTB), sg->len);
}
static void noinline sa11x0_dma_complete(struct sa11x0_dma_phy *p,
struct sa11x0_dma_chan *c)
{
struct sa11x0_dma_desc *txd = p->txd_done;
if (++p->sg_done == txd->sglen) {
if (!txd->cyclic) {
vchan_cookie_complete(&txd->vd);
p->sg_done = 0;
p->txd_done = p->txd_load;
if (!p->txd_done)
tasklet_schedule(&p->dev->task);
} else {
if ((p->sg_done % txd->period) == 0)
vchan_cyclic_callback(&txd->vd);
/* Cyclic: reset back to beginning */
p->sg_done = 0;
}
}
sa11x0_dma_start_sg(p, c);
}
static irqreturn_t sa11x0_dma_irq(int irq, void *dev_id)
{
struct sa11x0_dma_phy *p = dev_id;
struct sa11x0_dma_dev *d = p->dev;
struct sa11x0_dma_chan *c;
u32 dcsr;
dcsr = readl_relaxed(p->base + DMA_DCSR_R);
if (!(dcsr & (DCSR_ERROR | DCSR_DONEA | DCSR_DONEB)))
return IRQ_NONE;
/* Clear reported status bits */
writel_relaxed(dcsr & (DCSR_ERROR | DCSR_DONEA | DCSR_DONEB),
p->base + DMA_DCSR_C);
dev_dbg(d->slave.dev, "pchan %u: irq: DCSR:%02x\n", p->num, dcsr);
if (dcsr & DCSR_ERROR) {
dev_err(d->slave.dev, "pchan %u: error. DCSR:%02x DDAR:%08x DBSA:%08x DBTA:%08x DBSB:%08x DBTB:%08x\n",
p->num, dcsr,
readl_relaxed(p->base + DMA_DDAR),
readl_relaxed(p->base + DMA_DBSA),
readl_relaxed(p->base + DMA_DBTA),
readl_relaxed(p->base + DMA_DBSB),
readl_relaxed(p->base + DMA_DBTB));
}
c = p->vchan;
if (c) {
unsigned long flags;
spin_lock_irqsave(&c->vc.lock, flags);
/*
* Now that we're holding the lock, check that the vchan
* really is associated with this pchan before touching the
* hardware. This should always succeed, because we won't
* change p->vchan or c->phy while the channel is actively
* transferring.
*/
if (c->phy == p) {
if (dcsr & DCSR_DONEA)
sa11x0_dma_complete(p, c);
if (dcsr & DCSR_DONEB)
sa11x0_dma_complete(p, c);
}
spin_unlock_irqrestore(&c->vc.lock, flags);
}
return IRQ_HANDLED;
}
static void sa11x0_dma_start_txd(struct sa11x0_dma_chan *c)
{
struct sa11x0_dma_desc *txd = sa11x0_dma_next_desc(c);
/* If the issued list is empty, we have no further txds to process */
if (txd) {
struct sa11x0_dma_phy *p = c->phy;
sa11x0_dma_start_desc(p, txd);
p->txd_done = txd;
p->sg_done = 0;
/* The channel should not have any transfers started */
WARN_ON(readl_relaxed(p->base + DMA_DCSR_R) &
(DCSR_STRTA | DCSR_STRTB));
/* Clear the run and start bits before changing DDAR */
writel_relaxed(DCSR_RUN | DCSR_STRTA | DCSR_STRTB,
p->base + DMA_DCSR_C);
writel_relaxed(txd->ddar, p->base + DMA_DDAR);
/* Try to start both buffers */
sa11x0_dma_start_sg(p, c);
sa11x0_dma_start_sg(p, c);
}
}
static void sa11x0_dma_tasklet(struct tasklet_struct *t)
{
struct sa11x0_dma_dev *d = from_tasklet(d, t, task);
struct sa11x0_dma_phy *p;
struct sa11x0_dma_chan *c;
unsigned pch, pch_alloc = 0;
dev_dbg(d->slave.dev, "tasklet enter\n");
list_for_each_entry(c, &d->slave.channels, vc.chan.device_node) {
spin_lock_irq(&c->vc.lock);
p = c->phy;
if (p && !p->txd_done) {
sa11x0_dma_start_txd(c);
if (!p->txd_done) {
/* No current txd associated with this channel */
dev_dbg(d->slave.dev, "pchan %u: free\n", p->num);
/* Mark this channel free */
c->phy = NULL;
p->vchan = NULL;
}
}
spin_unlock_irq(&c->vc.lock);
}
spin_lock_irq(&d->lock);
for (pch = 0; pch < NR_PHY_CHAN; pch++) {
p = &d->phy[pch];
if (p->vchan == NULL && !list_empty(&d->chan_pending)) {
c = list_first_entry(&d->chan_pending,
struct sa11x0_dma_chan, node);
list_del_init(&c->node);
pch_alloc |= 1 << pch;
/* Mark this channel allocated */
p->vchan = c;
dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc);
}
}
spin_unlock_irq(&d->lock);
for (pch = 0; pch < NR_PHY_CHAN; pch++) {
if (pch_alloc & (1 << pch)) {
p = &d->phy[pch];
c = p->vchan;
spin_lock_irq(&c->vc.lock);
c->phy = p;
sa11x0_dma_start_txd(c);
spin_unlock_irq(&c->vc.lock);
}
}
dev_dbg(d->slave.dev, "tasklet exit\n");
}
static void sa11x0_dma_free_chan_resources(struct dma_chan *chan)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
unsigned long flags;
spin_lock_irqsave(&d->lock, flags);
list_del_init(&c->node);
spin_unlock_irqrestore(&d->lock, flags);
vchan_free_chan_resources(&c->vc);
}
static dma_addr_t sa11x0_dma_pos(struct sa11x0_dma_phy *p)
{
unsigned reg;
u32 dcsr;
dcsr = readl_relaxed(p->base + DMA_DCSR_R);
if ((dcsr & (DCSR_BIU | DCSR_STRTA)) == DCSR_STRTA ||
(dcsr & (DCSR_BIU | DCSR_STRTB)) == DCSR_BIU)
reg = DMA_DBSA;
else
reg = DMA_DBSB;
return readl_relaxed(p->base + reg);
}
static enum dma_status sa11x0_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *state)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
struct sa11x0_dma_phy *p;
struct virt_dma_desc *vd;
unsigned long flags;
enum dma_status ret;
ret = dma_cookie_status(&c->vc.chan, cookie, state);
if (ret == DMA_COMPLETE)
return ret;
if (!state)
return c->status;
spin_lock_irqsave(&c->vc.lock, flags);
p = c->phy;
/*
* If the cookie is on our issue queue, then the residue is
* its total size.
*/
vd = vchan_find_desc(&c->vc, cookie);
if (vd) {
state->residue = container_of(vd, struct sa11x0_dma_desc, vd)->size;
} else if (!p) {
state->residue = 0;
} else {
struct sa11x0_dma_desc *txd;
size_t bytes = 0;
if (p->txd_done && p->txd_done->vd.tx.cookie == cookie)
txd = p->txd_done;
else if (p->txd_load && p->txd_load->vd.tx.cookie == cookie)
txd = p->txd_load;
else
txd = NULL;
ret = c->status;
if (txd) {
dma_addr_t addr = sa11x0_dma_pos(p);
unsigned i;
dev_vdbg(d->slave.dev, "tx_status: addr:%pad\n", &addr);
for (i = 0; i < txd->sglen; i++) {
dev_vdbg(d->slave.dev, "tx_status: [%u] %x+%x\n",
i, txd->sg[i].addr, txd->sg[i].len);
if (addr >= txd->sg[i].addr &&
addr < txd->sg[i].addr + txd->sg[i].len) {
unsigned len;
len = txd->sg[i].len -
(addr - txd->sg[i].addr);
dev_vdbg(d->slave.dev, "tx_status: [%u] +%x\n",
i, len);
bytes += len;
i++;
break;
}
}
for (; i < txd->sglen; i++) {
dev_vdbg(d->slave.dev, "tx_status: [%u] %x+%x ++\n",
i, txd->sg[i].addr, txd->sg[i].len);
bytes += txd->sg[i].len;
}
}
state->residue = bytes;
}
spin_unlock_irqrestore(&c->vc.lock, flags);
dev_vdbg(d->slave.dev, "tx_status: bytes 0x%x\n", state->residue);
return ret;
}
/*
* Move pending txds to the issued list, and re-init pending list.
* If not already pending, add this channel to the list of pending
* channels and trigger the tasklet to run.
*/
static void sa11x0_dma_issue_pending(struct dma_chan *chan)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
unsigned long flags;
spin_lock_irqsave(&c->vc.lock, flags);
if (vchan_issue_pending(&c->vc)) {
if (!c->phy) {
spin_lock(&d->lock);
if (list_empty(&c->node)) {
list_add_tail(&c->node, &d->chan_pending);
tasklet_schedule(&d->task);
dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc);
}
spin_unlock(&d->lock);
}
} else
dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc);
spin_unlock_irqrestore(&c->vc.lock, flags);
}
static struct dma_async_tx_descriptor *sa11x0_dma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sg, unsigned int sglen,
enum dma_transfer_direction dir, unsigned long flags, void *context)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
struct sa11x0_dma_desc *txd;
struct scatterlist *sgent;
unsigned i, j = sglen;
size_t size = 0;
/* SA11x0 channels can only operate in their native direction */
if (dir != (c->ddar & DDAR_RW ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV)) {
dev_err(chan->device->dev, "vchan %p: bad DMA direction: DDAR:%08x dir:%u\n",
&c->vc, c->ddar, dir);
return NULL;
}
/* Do not allow zero-sized txds */
if (sglen == 0)
return NULL;
for_each_sg(sg, sgent, sglen, i) {
dma_addr_t addr = sg_dma_address(sgent);
unsigned int len = sg_dma_len(sgent);
if (len > DMA_MAX_SIZE)
j += DIV_ROUND_UP(len, DMA_MAX_SIZE & ~DMA_ALIGN) - 1;
if (addr & DMA_ALIGN) {
dev_dbg(chan->device->dev, "vchan %p: bad buffer alignment: %pad\n",
&c->vc, &addr);
return NULL;
}
}
txd = kzalloc(struct_size(txd, sg, j), GFP_ATOMIC);
if (!txd) {
dev_dbg(chan->device->dev, "vchan %p: kzalloc failed\n", &c->vc);
return NULL;
}
j = 0;
for_each_sg(sg, sgent, sglen, i) {
dma_addr_t addr = sg_dma_address(sgent);
unsigned len = sg_dma_len(sgent);
size += len;
do {
unsigned tlen = len;
/*
* Check whether the transfer will fit. If not, try
* to split the transfer up such that we end up with
* equal chunks - but make sure that we preserve the
* alignment. This avoids small segments.
*/
if (tlen > DMA_MAX_SIZE) {
unsigned mult = DIV_ROUND_UP(tlen,
DMA_MAX_SIZE & ~DMA_ALIGN);
tlen = (tlen / mult) & ~DMA_ALIGN;
}
txd->sg[j].addr = addr;
txd->sg[j].len = tlen;
addr += tlen;
len -= tlen;
j++;
} while (len);
}
txd->ddar = c->ddar;
txd->size = size;
txd->sglen = j;
dev_dbg(chan->device->dev, "vchan %p: txd %p: size %zu nr %u\n",
&c->vc, &txd->vd, txd->size, txd->sglen);
return vchan_tx_prep(&c->vc, &txd->vd, flags);
}
static struct dma_async_tx_descriptor *sa11x0_dma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t addr, size_t size, size_t period,
enum dma_transfer_direction dir, unsigned long flags)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
struct sa11x0_dma_desc *txd;
unsigned i, j, k, sglen, sgperiod;
/* SA11x0 channels can only operate in their native direction */
if (dir != (c->ddar & DDAR_RW ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV)) {
dev_err(chan->device->dev, "vchan %p: bad DMA direction: DDAR:%08x dir:%u\n",
&c->vc, c->ddar, dir);
return NULL;
}
sgperiod = DIV_ROUND_UP(period, DMA_MAX_SIZE & ~DMA_ALIGN);
sglen = size * sgperiod / period;
/* Do not allow zero-sized txds */
if (sglen == 0)
return NULL;
txd = kzalloc(struct_size(txd, sg, sglen), GFP_ATOMIC);
if (!txd) {
dev_dbg(chan->device->dev, "vchan %p: kzalloc failed\n", &c->vc);
return NULL;
}
for (i = k = 0; i < size / period; i++) {
size_t tlen, len = period;
for (j = 0; j < sgperiod; j++, k++) {
tlen = len;
if (tlen > DMA_MAX_SIZE) {
unsigned mult = DIV_ROUND_UP(tlen, DMA_MAX_SIZE & ~DMA_ALIGN);
tlen = (tlen / mult) & ~DMA_ALIGN;
}
txd->sg[k].addr = addr;
txd->sg[k].len = tlen;
addr += tlen;
len -= tlen;
}
WARN_ON(len != 0);
}
WARN_ON(k != sglen);
txd->ddar = c->ddar;
txd->size = size;
txd->sglen = sglen;
txd->cyclic = 1;
txd->period = sgperiod;
return vchan_tx_prep(&c->vc, &txd->vd, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
}
static int sa11x0_dma_device_config(struct dma_chan *chan,
struct dma_slave_config *cfg)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
u32 ddar = c->ddar & ((0xf << 4) | DDAR_RW);
dma_addr_t addr;
enum dma_slave_buswidth width;
u32 maxburst;
if (ddar & DDAR_RW) {
addr = cfg->src_addr;
width = cfg->src_addr_width;
maxburst = cfg->src_maxburst;
} else {
addr = cfg->dst_addr;
width = cfg->dst_addr_width;
maxburst = cfg->dst_maxburst;
}
if ((width != DMA_SLAVE_BUSWIDTH_1_BYTE &&
width != DMA_SLAVE_BUSWIDTH_2_BYTES) ||
(maxburst != 4 && maxburst != 8))
return -EINVAL;
if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
ddar |= DDAR_DW;
if (maxburst == 8)
ddar |= DDAR_BS;
dev_dbg(c->vc.chan.device->dev, "vchan %p: dma_slave_config addr %pad width %u burst %u\n",
&c->vc, &addr, width, maxburst);
c->ddar = ddar | (addr & 0xf0000000) | (addr & 0x003ffffc) << 6;
return 0;
}
static int sa11x0_dma_device_pause(struct dma_chan *chan)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
struct sa11x0_dma_phy *p;
unsigned long flags;
dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc);
spin_lock_irqsave(&c->vc.lock, flags);
if (c->status == DMA_IN_PROGRESS) {
c->status = DMA_PAUSED;
p = c->phy;
if (p) {
writel(DCSR_RUN | DCSR_IE, p->base + DMA_DCSR_C);
} else {
spin_lock(&d->lock);
list_del_init(&c->node);
spin_unlock(&d->lock);
}
}
spin_unlock_irqrestore(&c->vc.lock, flags);
return 0;
}
static int sa11x0_dma_device_resume(struct dma_chan *chan)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
struct sa11x0_dma_phy *p;
unsigned long flags;
dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc);
spin_lock_irqsave(&c->vc.lock, flags);
if (c->status == DMA_PAUSED) {
c->status = DMA_IN_PROGRESS;
p = c->phy;
if (p) {
writel(DCSR_RUN | DCSR_IE, p->base + DMA_DCSR_S);
} else if (!list_empty(&c->vc.desc_issued)) {
spin_lock(&d->lock);
list_add_tail(&c->node, &d->chan_pending);
spin_unlock(&d->lock);
}
}
spin_unlock_irqrestore(&c->vc.lock, flags);
return 0;
}
static int sa11x0_dma_device_terminate_all(struct dma_chan *chan)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
struct sa11x0_dma_phy *p;
LIST_HEAD(head);
unsigned long flags;
dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc);
/* Clear the tx descriptor lists */
spin_lock_irqsave(&c->vc.lock, flags);
vchan_get_all_descriptors(&c->vc, &head);
p = c->phy;
if (p) {
dev_dbg(d->slave.dev, "pchan %u: terminating\n", p->num);
/* vchan is assigned to a pchan - stop the channel */
writel(DCSR_RUN | DCSR_IE |
DCSR_STRTA | DCSR_DONEA |
DCSR_STRTB | DCSR_DONEB,
p->base + DMA_DCSR_C);
if (p->txd_load) {
if (p->txd_load != p->txd_done)
list_add_tail(&p->txd_load->vd.node, &head);
p->txd_load = NULL;
}
if (p->txd_done) {
list_add_tail(&p->txd_done->vd.node, &head);
p->txd_done = NULL;
}
c->phy = NULL;
spin_lock(&d->lock);
p->vchan = NULL;
spin_unlock(&d->lock);
tasklet_schedule(&d->task);
}
spin_unlock_irqrestore(&c->vc.lock, flags);
vchan_dma_desc_free_list(&c->vc, &head);
return 0;
}
struct sa11x0_dma_channel_desc {
u32 ddar;
const char *name;
};
#define CD(d1, d2) { .ddar = DDAR_##d1 | d2, .name = #d1 }
static const struct sa11x0_dma_channel_desc chan_desc[] = {
CD(Ser0UDCTr, 0),
CD(Ser0UDCRc, DDAR_RW),
CD(Ser1SDLCTr, 0),
CD(Ser1SDLCRc, DDAR_RW),
CD(Ser1UARTTr, 0),
CD(Ser1UARTRc, DDAR_RW),
CD(Ser2ICPTr, 0),
CD(Ser2ICPRc, DDAR_RW),
CD(Ser3UARTTr, 0),
CD(Ser3UARTRc, DDAR_RW),
CD(Ser4MCP0Tr, 0),
CD(Ser4MCP0Rc, DDAR_RW),
CD(Ser4MCP1Tr, 0),
CD(Ser4MCP1Rc, DDAR_RW),
CD(Ser4SSPTr, 0),
CD(Ser4SSPRc, DDAR_RW),
};
static const struct dma_slave_map sa11x0_dma_map[] = {
{ "sa11x0-ir", "tx", "Ser2ICPTr" },
{ "sa11x0-ir", "rx", "Ser2ICPRc" },
{ "sa11x0-ssp", "tx", "Ser4SSPTr" },
{ "sa11x0-ssp", "rx", "Ser4SSPRc" },
};
static bool sa11x0_dma_filter_fn(struct dma_chan *chan, void *param)
{
struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
const char *p = param;
return !strcmp(c->name, p);
}
static int sa11x0_dma_init_dmadev(struct dma_device *dmadev,
struct device *dev)
{
unsigned i;
INIT_LIST_HEAD(&dmadev->channels);
dmadev->dev = dev;
dmadev->device_free_chan_resources = sa11x0_dma_free_chan_resources;
dmadev->device_config = sa11x0_dma_device_config;
dmadev->device_pause = sa11x0_dma_device_pause;
dmadev->device_resume = sa11x0_dma_device_resume;
dmadev->device_terminate_all = sa11x0_dma_device_terminate_all;
dmadev->device_tx_status = sa11x0_dma_tx_status;
dmadev->device_issue_pending = sa11x0_dma_issue_pending;
for (i = 0; i < ARRAY_SIZE(chan_desc); i++) {
struct sa11x0_dma_chan *c;
c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c) {
dev_err(dev, "no memory for channel %u\n", i);
return -ENOMEM;
}
c->status = DMA_IN_PROGRESS;
c->ddar = chan_desc[i].ddar;
c->name = chan_desc[i].name;
INIT_LIST_HEAD(&c->node);
c->vc.desc_free = sa11x0_dma_free_desc;
vchan_init(&c->vc, dmadev);
}
return dma_async_device_register(dmadev);
}
static int sa11x0_dma_request_irq(struct platform_device *pdev, int nr,
void *data)
{
int irq = platform_get_irq(pdev, nr);
if (irq <= 0)
return -ENXIO;
return request_irq(irq, sa11x0_dma_irq, 0, dev_name(&pdev->dev), data);
}
static void sa11x0_dma_free_irq(struct platform_device *pdev, int nr,
void *data)
{
int irq = platform_get_irq(pdev, nr);
if (irq > 0)
free_irq(irq, data);
}
static void sa11x0_dma_free_channels(struct dma_device *dmadev)
{
struct sa11x0_dma_chan *c, *cn;
list_for_each_entry_safe(c, cn, &dmadev->channels, vc.chan.device_node) {
list_del(&c->vc.chan.device_node);
tasklet_kill(&c->vc.task);
kfree(c);
}
}
static int sa11x0_dma_probe(struct platform_device *pdev)
{
struct sa11x0_dma_dev *d;
struct resource *res;
unsigned i;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
ret = -ENOMEM;
goto err_alloc;
}
spin_lock_init(&d->lock);
INIT_LIST_HEAD(&d->chan_pending);
d->slave.filter.fn = sa11x0_dma_filter_fn;
d->slave.filter.mapcnt = ARRAY_SIZE(sa11x0_dma_map);
d->slave.filter.map = sa11x0_dma_map;
d->base = ioremap(res->start, resource_size(res));
if (!d->base) {
ret = -ENOMEM;
goto err_ioremap;
}
tasklet_setup(&d->task, sa11x0_dma_tasklet);
for (i = 0; i < NR_PHY_CHAN; i++) {
struct sa11x0_dma_phy *p = &d->phy[i];
p->dev = d;
p->num = i;
p->base = d->base + i * DMA_SIZE;
writel_relaxed(DCSR_RUN | DCSR_IE | DCSR_ERROR |
DCSR_DONEA | DCSR_STRTA | DCSR_DONEB | DCSR_STRTB,
p->base + DMA_DCSR_C);
writel_relaxed(0, p->base + DMA_DDAR);
ret = sa11x0_dma_request_irq(pdev, i, p);
if (ret) {
while (i) {
i--;
sa11x0_dma_free_irq(pdev, i, &d->phy[i]);
}
goto err_irq;
}
}
dma_cap_set(DMA_SLAVE, d->slave.cap_mask);
dma_cap_set(DMA_CYCLIC, d->slave.cap_mask);
d->slave.device_prep_slave_sg = sa11x0_dma_prep_slave_sg;
d->slave.device_prep_dma_cyclic = sa11x0_dma_prep_dma_cyclic;
d->slave.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
d->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
d->slave.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES);
d->slave.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES);
ret = sa11x0_dma_init_dmadev(&d->slave, &pdev->dev);
if (ret) {
dev_warn(d->slave.dev, "failed to register slave async device: %d\n",
ret);
goto err_slave_reg;
}
platform_set_drvdata(pdev, d);
return 0;
err_slave_reg:
sa11x0_dma_free_channels(&d->slave);
for (i = 0; i < NR_PHY_CHAN; i++)
sa11x0_dma_free_irq(pdev, i, &d->phy[i]);
err_irq:
tasklet_kill(&d->task);
iounmap(d->base);
err_ioremap:
kfree(d);
err_alloc:
return ret;
}
static int sa11x0_dma_remove(struct platform_device *pdev)
{
struct sa11x0_dma_dev *d = platform_get_drvdata(pdev);
unsigned pch;
dma_async_device_unregister(&d->slave);
sa11x0_dma_free_channels(&d->slave);
for (pch = 0; pch < NR_PHY_CHAN; pch++)
sa11x0_dma_free_irq(pdev, pch, &d->phy[pch]);
tasklet_kill(&d->task);
iounmap(d->base);
kfree(d);
return 0;
}
static __maybe_unused int sa11x0_dma_suspend(struct device *dev)
{
struct sa11x0_dma_dev *d = dev_get_drvdata(dev);
unsigned pch;
for (pch = 0; pch < NR_PHY_CHAN; pch++) {
struct sa11x0_dma_phy *p = &d->phy[pch];
u32 dcsr, saved_dcsr;
dcsr = saved_dcsr = readl_relaxed(p->base + DMA_DCSR_R);
if (dcsr & DCSR_RUN) {
writel(DCSR_RUN | DCSR_IE, p->base + DMA_DCSR_C);
dcsr = readl_relaxed(p->base + DMA_DCSR_R);
}
saved_dcsr &= DCSR_RUN | DCSR_IE;
if (dcsr & DCSR_BIU) {
p->dbs[0] = readl_relaxed(p->base + DMA_DBSB);
p->dbt[0] = readl_relaxed(p->base + DMA_DBTB);
p->dbs[1] = readl_relaxed(p->base + DMA_DBSA);
p->dbt[1] = readl_relaxed(p->base + DMA_DBTA);
saved_dcsr |= (dcsr & DCSR_STRTA ? DCSR_STRTB : 0) |
(dcsr & DCSR_STRTB ? DCSR_STRTA : 0);
} else {
p->dbs[0] = readl_relaxed(p->base + DMA_DBSA);
p->dbt[0] = readl_relaxed(p->base + DMA_DBTA);
p->dbs[1] = readl_relaxed(p->base + DMA_DBSB);
p->dbt[1] = readl_relaxed(p->base + DMA_DBTB);
saved_dcsr |= dcsr & (DCSR_STRTA | DCSR_STRTB);
}
p->dcsr = saved_dcsr;
writel(DCSR_STRTA | DCSR_STRTB, p->base + DMA_DCSR_C);
}
return 0;
}
static __maybe_unused int sa11x0_dma_resume(struct device *dev)
{
struct sa11x0_dma_dev *d = dev_get_drvdata(dev);
unsigned pch;
for (pch = 0; pch < NR_PHY_CHAN; pch++) {
struct sa11x0_dma_phy *p = &d->phy[pch];
struct sa11x0_dma_desc *txd = NULL;
u32 dcsr = readl_relaxed(p->base + DMA_DCSR_R);
WARN_ON(dcsr & (DCSR_BIU | DCSR_STRTA | DCSR_STRTB | DCSR_RUN));
if (p->txd_done)
txd = p->txd_done;
else if (p->txd_load)
txd = p->txd_load;
if (!txd)
continue;
writel_relaxed(txd->ddar, p->base + DMA_DDAR);
writel_relaxed(p->dbs[0], p->base + DMA_DBSA);
writel_relaxed(p->dbt[0], p->base + DMA_DBTA);
writel_relaxed(p->dbs[1], p->base + DMA_DBSB);
writel_relaxed(p->dbt[1], p->base + DMA_DBTB);
writel_relaxed(p->dcsr, p->base + DMA_DCSR_S);
}
return 0;
}
static const struct dev_pm_ops sa11x0_dma_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sa11x0_dma_suspend, sa11x0_dma_resume)
};
static struct platform_driver sa11x0_dma_driver = {
.driver = {
.name = "sa11x0-dma",
.pm = &sa11x0_dma_pm_ops,
},
.probe = sa11x0_dma_probe,
.remove = sa11x0_dma_remove,
};
static int __init sa11x0_dma_init(void)
{
return platform_driver_register(&sa11x0_dma_driver);
}
subsys_initcall(sa11x0_dma_init);
static void __exit sa11x0_dma_exit(void)
{
platform_driver_unregister(&sa11x0_dma_driver);
}
module_exit(sa11x0_dma_exit);
MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("SA-11x0 DMA driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sa11x0-dma");
| linux-master | drivers/dma/sa11x0-dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for the Atmel Extensible DMA Controller (aka XDMAC on AT91 systems)
*
* Copyright (C) 2014 Atmel Corporation
*
* Author: Ludovic Desroches <[email protected]>
*/
#include <asm/barrier.h>
#include <dt-bindings/dma/at91.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of_dma.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include "dmaengine.h"
/* Global registers */
#define AT_XDMAC_GTYPE 0x00 /* Global Type Register */
#define AT_XDMAC_NB_CH(i) (((i) & 0x1F) + 1) /* Number of Channels Minus One */
#define AT_XDMAC_FIFO_SZ(i) (((i) >> 5) & 0x7FF) /* Number of Bytes */
#define AT_XDMAC_NB_REQ(i) ((((i) >> 16) & 0x3F) + 1) /* Number of Peripheral Requests Minus One */
#define AT_XDMAC_GCFG 0x04 /* Global Configuration Register */
#define AT_XDMAC_WRHP(i) (((i) & 0xF) << 4)
#define AT_XDMAC_WRMP(i) (((i) & 0xF) << 8)
#define AT_XDMAC_WRLP(i) (((i) & 0xF) << 12)
#define AT_XDMAC_RDHP(i) (((i) & 0xF) << 16)
#define AT_XDMAC_RDMP(i) (((i) & 0xF) << 20)
#define AT_XDMAC_RDLP(i) (((i) & 0xF) << 24)
#define AT_XDMAC_RDSG(i) (((i) & 0xF) << 28)
#define AT_XDMAC_GCFG_M2M (AT_XDMAC_RDLP(0xF) | AT_XDMAC_WRLP(0xF))
#define AT_XDMAC_GCFG_P2M (AT_XDMAC_RDSG(0x1) | AT_XDMAC_RDHP(0x3) | \
AT_XDMAC_WRHP(0x5))
#define AT_XDMAC_GWAC 0x08 /* Global Weighted Arbiter Configuration Register */
#define AT_XDMAC_PW0(i) (((i) & 0xF) << 0)
#define AT_XDMAC_PW1(i) (((i) & 0xF) << 4)
#define AT_XDMAC_PW2(i) (((i) & 0xF) << 8)
#define AT_XDMAC_PW3(i) (((i) & 0xF) << 12)
#define AT_XDMAC_GWAC_M2M 0
#define AT_XDMAC_GWAC_P2M (AT_XDMAC_PW0(0xF) | AT_XDMAC_PW2(0xF))
#define AT_XDMAC_GIE 0x0C /* Global Interrupt Enable Register */
#define AT_XDMAC_GID 0x10 /* Global Interrupt Disable Register */
#define AT_XDMAC_GIM 0x14 /* Global Interrupt Mask Register */
#define AT_XDMAC_GIS 0x18 /* Global Interrupt Status Register */
#define AT_XDMAC_GE 0x1C /* Global Channel Enable Register */
#define AT_XDMAC_GD 0x20 /* Global Channel Disable Register */
#define AT_XDMAC_GS 0x24 /* Global Channel Status Register */
#define AT_XDMAC_VERSION 0xFFC /* XDMAC Version Register */
/* Channel relative registers offsets */
#define AT_XDMAC_CIE 0x00 /* Channel Interrupt Enable Register */
#define AT_XDMAC_CIE_BIE BIT(0) /* End of Block Interrupt Enable Bit */
#define AT_XDMAC_CIE_LIE BIT(1) /* End of Linked List Interrupt Enable Bit */
#define AT_XDMAC_CIE_DIE BIT(2) /* End of Disable Interrupt Enable Bit */
#define AT_XDMAC_CIE_FIE BIT(3) /* End of Flush Interrupt Enable Bit */
#define AT_XDMAC_CIE_RBEIE BIT(4) /* Read Bus Error Interrupt Enable Bit */
#define AT_XDMAC_CIE_WBEIE BIT(5) /* Write Bus Error Interrupt Enable Bit */
#define AT_XDMAC_CIE_ROIE BIT(6) /* Request Overflow Interrupt Enable Bit */
#define AT_XDMAC_CID 0x04 /* Channel Interrupt Disable Register */
#define AT_XDMAC_CID_BID BIT(0) /* End of Block Interrupt Disable Bit */
#define AT_XDMAC_CID_LID BIT(1) /* End of Linked List Interrupt Disable Bit */
#define AT_XDMAC_CID_DID BIT(2) /* End of Disable Interrupt Disable Bit */
#define AT_XDMAC_CID_FID BIT(3) /* End of Flush Interrupt Disable Bit */
#define AT_XDMAC_CID_RBEID BIT(4) /* Read Bus Error Interrupt Disable Bit */
#define AT_XDMAC_CID_WBEID BIT(5) /* Write Bus Error Interrupt Disable Bit */
#define AT_XDMAC_CID_ROID BIT(6) /* Request Overflow Interrupt Disable Bit */
#define AT_XDMAC_CIM 0x08 /* Channel Interrupt Mask Register */
#define AT_XDMAC_CIM_BIM BIT(0) /* End of Block Interrupt Mask Bit */
#define AT_XDMAC_CIM_LIM BIT(1) /* End of Linked List Interrupt Mask Bit */
#define AT_XDMAC_CIM_DIM BIT(2) /* End of Disable Interrupt Mask Bit */
#define AT_XDMAC_CIM_FIM BIT(3) /* End of Flush Interrupt Mask Bit */
#define AT_XDMAC_CIM_RBEIM BIT(4) /* Read Bus Error Interrupt Mask Bit */
#define AT_XDMAC_CIM_WBEIM BIT(5) /* Write Bus Error Interrupt Mask Bit */
#define AT_XDMAC_CIM_ROIM BIT(6) /* Request Overflow Interrupt Mask Bit */
#define AT_XDMAC_CIS 0x0C /* Channel Interrupt Status Register */
#define AT_XDMAC_CIS_BIS BIT(0) /* End of Block Interrupt Status Bit */
#define AT_XDMAC_CIS_LIS BIT(1) /* End of Linked List Interrupt Status Bit */
#define AT_XDMAC_CIS_DIS BIT(2) /* End of Disable Interrupt Status Bit */
#define AT_XDMAC_CIS_FIS BIT(3) /* End of Flush Interrupt Status Bit */
#define AT_XDMAC_CIS_RBEIS BIT(4) /* Read Bus Error Interrupt Status Bit */
#define AT_XDMAC_CIS_WBEIS BIT(5) /* Write Bus Error Interrupt Status Bit */
#define AT_XDMAC_CIS_ROIS BIT(6) /* Request Overflow Interrupt Status Bit */
#define AT_XDMAC_CSA 0x10 /* Channel Source Address Register */
#define AT_XDMAC_CDA 0x14 /* Channel Destination Address Register */
#define AT_XDMAC_CNDA 0x18 /* Channel Next Descriptor Address Register */
#define AT_XDMAC_CNDA_NDAIF(i) ((i) & 0x1) /* Channel x Next Descriptor Interface */
#define AT_XDMAC_CNDA_NDA(i) ((i) & 0xfffffffc) /* Channel x Next Descriptor Address */
#define AT_XDMAC_CNDC 0x1C /* Channel Next Descriptor Control Register */
#define AT_XDMAC_CNDC_NDE (0x1 << 0) /* Channel x Next Descriptor Enable */
#define AT_XDMAC_CNDC_NDSUP (0x1 << 1) /* Channel x Next Descriptor Source Update */
#define AT_XDMAC_CNDC_NDDUP (0x1 << 2) /* Channel x Next Descriptor Destination Update */
#define AT_XDMAC_CNDC_NDVIEW_MASK GENMASK(28, 27)
#define AT_XDMAC_CNDC_NDVIEW_NDV0 (0x0 << 3) /* Channel x Next Descriptor View 0 */
#define AT_XDMAC_CNDC_NDVIEW_NDV1 (0x1 << 3) /* Channel x Next Descriptor View 1 */
#define AT_XDMAC_CNDC_NDVIEW_NDV2 (0x2 << 3) /* Channel x Next Descriptor View 2 */
#define AT_XDMAC_CNDC_NDVIEW_NDV3 (0x3 << 3) /* Channel x Next Descriptor View 3 */
#define AT_XDMAC_CUBC 0x20 /* Channel Microblock Control Register */
#define AT_XDMAC_CBC 0x24 /* Channel Block Control Register */
#define AT_XDMAC_CC 0x28 /* Channel Configuration Register */
#define AT_XDMAC_CC_TYPE (0x1 << 0) /* Channel Transfer Type */
#define AT_XDMAC_CC_TYPE_MEM_TRAN (0x0 << 0) /* Memory to Memory Transfer */
#define AT_XDMAC_CC_TYPE_PER_TRAN (0x1 << 0) /* Peripheral to Memory or Memory to Peripheral Transfer */
#define AT_XDMAC_CC_MBSIZE_MASK (0x3 << 1)
#define AT_XDMAC_CC_MBSIZE_SINGLE (0x0 << 1)
#define AT_XDMAC_CC_MBSIZE_FOUR (0x1 << 1)
#define AT_XDMAC_CC_MBSIZE_EIGHT (0x2 << 1)
#define AT_XDMAC_CC_MBSIZE_SIXTEEN (0x3 << 1)
#define AT_XDMAC_CC_DSYNC (0x1 << 4) /* Channel Synchronization */
#define AT_XDMAC_CC_DSYNC_PER2MEM (0x0 << 4)
#define AT_XDMAC_CC_DSYNC_MEM2PER (0x1 << 4)
#define AT_XDMAC_CC_PROT (0x1 << 5) /* Channel Protection */
#define AT_XDMAC_CC_PROT_SEC (0x0 << 5)
#define AT_XDMAC_CC_PROT_UNSEC (0x1 << 5)
#define AT_XDMAC_CC_SWREQ (0x1 << 6) /* Channel Software Request Trigger */
#define AT_XDMAC_CC_SWREQ_HWR_CONNECTED (0x0 << 6)
#define AT_XDMAC_CC_SWREQ_SWR_CONNECTED (0x1 << 6)
#define AT_XDMAC_CC_MEMSET (0x1 << 7) /* Channel Fill Block of memory */
#define AT_XDMAC_CC_MEMSET_NORMAL_MODE (0x0 << 7)
#define AT_XDMAC_CC_MEMSET_HW_MODE (0x1 << 7)
#define AT_XDMAC_CC_CSIZE(i) ((0x7 & (i)) << 8) /* Channel Chunk Size */
#define AT_XDMAC_CC_DWIDTH_OFFSET 11
#define AT_XDMAC_CC_DWIDTH_MASK (0x3 << AT_XDMAC_CC_DWIDTH_OFFSET)
#define AT_XDMAC_CC_DWIDTH(i) ((0x3 & (i)) << AT_XDMAC_CC_DWIDTH_OFFSET) /* Channel Data Width */
#define AT_XDMAC_CC_DWIDTH_BYTE 0x0
#define AT_XDMAC_CC_DWIDTH_HALFWORD 0x1
#define AT_XDMAC_CC_DWIDTH_WORD 0x2
#define AT_XDMAC_CC_DWIDTH_DWORD 0x3
#define AT_XDMAC_CC_SIF(i) ((0x1 & (i)) << 13) /* Channel Source Interface Identifier */
#define AT_XDMAC_CC_DIF(i) ((0x1 & (i)) << 14) /* Channel Destination Interface Identifier */
#define AT_XDMAC_CC_SAM_MASK (0x3 << 16) /* Channel Source Addressing Mode */
#define AT_XDMAC_CC_SAM_FIXED_AM (0x0 << 16)
#define AT_XDMAC_CC_SAM_INCREMENTED_AM (0x1 << 16)
#define AT_XDMAC_CC_SAM_UBS_AM (0x2 << 16)
#define AT_XDMAC_CC_SAM_UBS_DS_AM (0x3 << 16)
#define AT_XDMAC_CC_DAM_MASK (0x3 << 18) /* Channel Source Addressing Mode */
#define AT_XDMAC_CC_DAM_FIXED_AM (0x0 << 18)
#define AT_XDMAC_CC_DAM_INCREMENTED_AM (0x1 << 18)
#define AT_XDMAC_CC_DAM_UBS_AM (0x2 << 18)
#define AT_XDMAC_CC_DAM_UBS_DS_AM (0x3 << 18)
#define AT_XDMAC_CC_INITD (0x1 << 21) /* Channel Initialization Terminated (read only) */
#define AT_XDMAC_CC_INITD_TERMINATED (0x0 << 21)
#define AT_XDMAC_CC_INITD_IN_PROGRESS (0x1 << 21)
#define AT_XDMAC_CC_RDIP (0x1 << 22) /* Read in Progress (read only) */
#define AT_XDMAC_CC_RDIP_DONE (0x0 << 22)
#define AT_XDMAC_CC_RDIP_IN_PROGRESS (0x1 << 22)
#define AT_XDMAC_CC_WRIP (0x1 << 23) /* Write in Progress (read only) */
#define AT_XDMAC_CC_WRIP_DONE (0x0 << 23)
#define AT_XDMAC_CC_WRIP_IN_PROGRESS (0x1 << 23)
#define AT_XDMAC_CC_PERID(i) ((0x7f & (i)) << 24) /* Channel Peripheral Identifier */
#define AT_XDMAC_CDS_MSP 0x2C /* Channel Data Stride Memory Set Pattern */
#define AT_XDMAC_CSUS 0x30 /* Channel Source Microblock Stride */
#define AT_XDMAC_CDUS 0x34 /* Channel Destination Microblock Stride */
/* Microblock control members */
#define AT_XDMAC_MBR_UBC_UBLEN_MAX 0xFFFFFFUL /* Maximum Microblock Length */
#define AT_XDMAC_MBR_UBC_NDE (0x1 << 24) /* Next Descriptor Enable */
#define AT_XDMAC_MBR_UBC_NSEN (0x1 << 25) /* Next Descriptor Source Update */
#define AT_XDMAC_MBR_UBC_NDEN (0x1 << 26) /* Next Descriptor Destination Update */
#define AT_XDMAC_MBR_UBC_NDV0 (0x0 << 27) /* Next Descriptor View 0 */
#define AT_XDMAC_MBR_UBC_NDV1 (0x1 << 27) /* Next Descriptor View 1 */
#define AT_XDMAC_MBR_UBC_NDV2 (0x2 << 27) /* Next Descriptor View 2 */
#define AT_XDMAC_MBR_UBC_NDV3 (0x3 << 27) /* Next Descriptor View 3 */
#define AT_XDMAC_MAX_CHAN 0x20
#define AT_XDMAC_MAX_CSIZE 16 /* 16 data */
#define AT_XDMAC_MAX_DWIDTH 8 /* 64 bits */
#define AT_XDMAC_RESIDUE_MAX_RETRIES 5
#define AT_XDMAC_DMA_BUSWIDTHS\
(BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) |\
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |\
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |\
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |\
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
enum atc_status {
AT_XDMAC_CHAN_IS_CYCLIC = 0,
AT_XDMAC_CHAN_IS_PAUSED,
AT_XDMAC_CHAN_IS_PAUSED_INTERNAL,
};
struct at_xdmac_layout {
/* Global Channel Read Suspend Register */
u8 grs;
/* Global Write Suspend Register */
u8 gws;
/* Global Channel Read Write Suspend Register */
u8 grws;
/* Global Channel Read Write Resume Register */
u8 grwr;
/* Global Channel Software Request Register */
u8 gswr;
/* Global channel Software Request Status Register */
u8 gsws;
/* Global Channel Software Flush Request Register */
u8 gswf;
/* Channel reg base */
u8 chan_cc_reg_base;
/* Source/Destination Interface must be specified or not */
bool sdif;
/* AXI queue priority configuration supported */
bool axi_config;
};
/* ----- Channels ----- */
struct at_xdmac_chan {
struct dma_chan chan;
void __iomem *ch_regs;
u32 mask; /* Channel Mask */
u32 cfg; /* Channel Configuration Register */
u8 perid; /* Peripheral ID */
u8 perif; /* Peripheral Interface */
u8 memif; /* Memory Interface */
u32 save_cc;
u32 save_cim;
u32 save_cnda;
u32 save_cndc;
u32 irq_status;
unsigned long status;
struct tasklet_struct tasklet;
struct dma_slave_config sconfig;
spinlock_t lock;
struct list_head xfers_list;
struct list_head free_descs_list;
};
/* ----- Controller ----- */
struct at_xdmac {
struct dma_device dma;
void __iomem *regs;
struct device *dev;
int irq;
struct clk *clk;
u32 save_gim;
u32 save_gs;
struct dma_pool *at_xdmac_desc_pool;
const struct at_xdmac_layout *layout;
struct at_xdmac_chan chan[];
};
/* ----- Descriptors ----- */
/* Linked List Descriptor */
struct at_xdmac_lld {
u32 mbr_nda; /* Next Descriptor Member */
u32 mbr_ubc; /* Microblock Control Member */
u32 mbr_sa; /* Source Address Member */
u32 mbr_da; /* Destination Address Member */
u32 mbr_cfg; /* Configuration Register */
u32 mbr_bc; /* Block Control Register */
u32 mbr_ds; /* Data Stride Register */
u32 mbr_sus; /* Source Microblock Stride Register */
u32 mbr_dus; /* Destination Microblock Stride Register */
};
/* 64-bit alignment needed to update CNDA and CUBC registers in an atomic way. */
struct at_xdmac_desc {
struct at_xdmac_lld lld;
enum dma_transfer_direction direction;
struct dma_async_tx_descriptor tx_dma_desc;
struct list_head desc_node;
/* Following members are only used by the first descriptor */
bool active_xfer;
unsigned int xfer_size;
struct list_head descs_list;
struct list_head xfer_node;
} __aligned(sizeof(u64));
static const struct at_xdmac_layout at_xdmac_sama5d4_layout = {
.grs = 0x28,
.gws = 0x2C,
.grws = 0x30,
.grwr = 0x34,
.gswr = 0x38,
.gsws = 0x3C,
.gswf = 0x40,
.chan_cc_reg_base = 0x50,
.sdif = true,
.axi_config = false,
};
static const struct at_xdmac_layout at_xdmac_sama7g5_layout = {
.grs = 0x30,
.gws = 0x38,
.grws = 0x40,
.grwr = 0x44,
.gswr = 0x48,
.gsws = 0x4C,
.gswf = 0x50,
.chan_cc_reg_base = 0x60,
.sdif = false,
.axi_config = true,
};
static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb)
{
return atxdmac->regs + (atxdmac->layout->chan_cc_reg_base + chan_nb * 0x40);
}
#define at_xdmac_read(atxdmac, reg) readl_relaxed((atxdmac)->regs + (reg))
#define at_xdmac_write(atxdmac, reg, value) \
writel_relaxed((value), (atxdmac)->regs + (reg))
#define at_xdmac_chan_read(atchan, reg) readl_relaxed((atchan)->ch_regs + (reg))
#define at_xdmac_chan_write(atchan, reg, value) writel_relaxed((value), (atchan)->ch_regs + (reg))
static inline struct at_xdmac_chan *to_at_xdmac_chan(struct dma_chan *dchan)
{
return container_of(dchan, struct at_xdmac_chan, chan);
}
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static inline struct at_xdmac *to_at_xdmac(struct dma_device *ddev)
{
return container_of(ddev, struct at_xdmac, dma);
}
static inline struct at_xdmac_desc *txd_to_at_desc(struct dma_async_tx_descriptor *txd)
{
return container_of(txd, struct at_xdmac_desc, tx_dma_desc);
}
static inline int at_xdmac_chan_is_cyclic(struct at_xdmac_chan *atchan)
{
return test_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
}
static inline int at_xdmac_chan_is_paused(struct at_xdmac_chan *atchan)
{
return test_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
}
static inline int at_xdmac_chan_is_paused_internal(struct at_xdmac_chan *atchan)
{
return test_bit(AT_XDMAC_CHAN_IS_PAUSED_INTERNAL, &atchan->status);
}
static inline bool at_xdmac_chan_is_peripheral_xfer(u32 cfg)
{
return cfg & AT_XDMAC_CC_TYPE_PER_TRAN;
}
static inline u8 at_xdmac_get_dwidth(u32 cfg)
{
return (cfg & AT_XDMAC_CC_DWIDTH_MASK) >> AT_XDMAC_CC_DWIDTH_OFFSET;
};
static unsigned int init_nr_desc_per_channel = 64;
module_param(init_nr_desc_per_channel, uint, 0644);
MODULE_PARM_DESC(init_nr_desc_per_channel,
"initial descriptors per channel (default: 64)");
static void at_xdmac_runtime_suspend_descriptors(struct at_xdmac_chan *atchan)
{
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
struct at_xdmac_desc *desc, *_desc;
list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) {
if (!desc->active_xfer)
continue;
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
}
}
static int at_xdmac_runtime_resume_descriptors(struct at_xdmac_chan *atchan)
{
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
struct at_xdmac_desc *desc, *_desc;
int ret;
list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) {
if (!desc->active_xfer)
continue;
ret = pm_runtime_resume_and_get(atxdmac->dev);
if (ret < 0)
return ret;
}
return 0;
}
static bool at_xdmac_chan_is_enabled(struct at_xdmac_chan *atchan)
{
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
int ret;
ret = pm_runtime_resume_and_get(atxdmac->dev);
if (ret < 0)
return false;
ret = !!(at_xdmac_chan_read(atchan, AT_XDMAC_GS) & atchan->mask);
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
return ret;
}
static void at_xdmac_off(struct at_xdmac *atxdmac, bool suspend_descriptors)
{
struct dma_chan *chan, *_chan;
struct at_xdmac_chan *atchan;
int ret;
ret = pm_runtime_resume_and_get(atxdmac->dev);
if (ret < 0)
return;
at_xdmac_write(atxdmac, AT_XDMAC_GD, -1L);
/* Wait that all chans are disabled. */
while (at_xdmac_read(atxdmac, AT_XDMAC_GS))
cpu_relax();
at_xdmac_write(atxdmac, AT_XDMAC_GID, -1L);
/* Decrement runtime PM ref counter for each active descriptor. */
if (!list_empty(&atxdmac->dma.channels) && suspend_descriptors) {
list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels,
device_node) {
atchan = to_at_xdmac_chan(chan);
at_xdmac_runtime_suspend_descriptors(atchan);
}
}
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
}
/* Call with lock hold. */
static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan,
struct at_xdmac_desc *first)
{
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
u32 reg;
int ret;
ret = pm_runtime_resume_and_get(atxdmac->dev);
if (ret < 0)
return;
dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, first);
/* Set transfer as active to not try to start it again. */
first->active_xfer = true;
/* Tell xdmac where to get the first descriptor. */
reg = AT_XDMAC_CNDA_NDA(first->tx_dma_desc.phys);
if (atxdmac->layout->sdif)
reg |= AT_XDMAC_CNDA_NDAIF(atchan->memif);
at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, reg);
/*
* When doing non cyclic transfer we need to use the next
* descriptor view 2 since some fields of the configuration register
* depend on transfer size and src/dest addresses.
*/
if (at_xdmac_chan_is_cyclic(atchan))
reg = AT_XDMAC_CNDC_NDVIEW_NDV1;
else if ((first->lld.mbr_ubc &
AT_XDMAC_CNDC_NDVIEW_MASK) == AT_XDMAC_MBR_UBC_NDV3)
reg = AT_XDMAC_CNDC_NDVIEW_NDV3;
else
reg = AT_XDMAC_CNDC_NDVIEW_NDV2;
/*
* Even if the register will be updated from the configuration in the
* descriptor when using view 2 or higher, the PROT bit won't be set
* properly. This bit can be modified only by using the channel
* configuration register.
*/
at_xdmac_chan_write(atchan, AT_XDMAC_CC, first->lld.mbr_cfg);
reg |= AT_XDMAC_CNDC_NDDUP
| AT_XDMAC_CNDC_NDSUP
| AT_XDMAC_CNDC_NDE;
at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, reg);
dev_vdbg(chan2dev(&atchan->chan),
"%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n",
__func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC),
at_xdmac_chan_read(atchan, AT_XDMAC_CNDA),
at_xdmac_chan_read(atchan, AT_XDMAC_CNDC),
at_xdmac_chan_read(atchan, AT_XDMAC_CSA),
at_xdmac_chan_read(atchan, AT_XDMAC_CDA),
at_xdmac_chan_read(atchan, AT_XDMAC_CUBC));
at_xdmac_chan_write(atchan, AT_XDMAC_CID, 0xffffffff);
reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE;
/*
* Request Overflow Error is only for peripheral synchronized transfers
*/
if (at_xdmac_chan_is_peripheral_xfer(first->lld.mbr_cfg))
reg |= AT_XDMAC_CIE_ROIE;
/*
* There is no end of list when doing cyclic dma, we need to get
* an interrupt after each periods.
*/
if (at_xdmac_chan_is_cyclic(atchan))
at_xdmac_chan_write(atchan, AT_XDMAC_CIE,
reg | AT_XDMAC_CIE_BIE);
else
at_xdmac_chan_write(atchan, AT_XDMAC_CIE,
reg | AT_XDMAC_CIE_LIE);
at_xdmac_write(atxdmac, AT_XDMAC_GIE, atchan->mask);
dev_vdbg(chan2dev(&atchan->chan),
"%s: enable channel (0x%08x)\n", __func__, atchan->mask);
wmb();
at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask);
dev_vdbg(chan2dev(&atchan->chan),
"%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n",
__func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC),
at_xdmac_chan_read(atchan, AT_XDMAC_CNDA),
at_xdmac_chan_read(atchan, AT_XDMAC_CNDC),
at_xdmac_chan_read(atchan, AT_XDMAC_CSA),
at_xdmac_chan_read(atchan, AT_XDMAC_CDA),
at_xdmac_chan_read(atchan, AT_XDMAC_CUBC));
}
static dma_cookie_t at_xdmac_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct at_xdmac_desc *desc = txd_to_at_desc(tx);
struct at_xdmac_chan *atchan = to_at_xdmac_chan(tx->chan);
dma_cookie_t cookie;
unsigned long irqflags;
spin_lock_irqsave(&atchan->lock, irqflags);
cookie = dma_cookie_assign(tx);
list_add_tail(&desc->xfer_node, &atchan->xfers_list);
spin_unlock_irqrestore(&atchan->lock, irqflags);
dev_vdbg(chan2dev(tx->chan), "%s: atchan 0x%p, add desc 0x%p to xfers_list\n",
__func__, atchan, desc);
return cookie;
}
static struct at_xdmac_desc *at_xdmac_alloc_desc(struct dma_chan *chan,
gfp_t gfp_flags)
{
struct at_xdmac_desc *desc;
struct at_xdmac *atxdmac = to_at_xdmac(chan->device);
dma_addr_t phys;
desc = dma_pool_zalloc(atxdmac->at_xdmac_desc_pool, gfp_flags, &phys);
if (desc) {
INIT_LIST_HEAD(&desc->descs_list);
dma_async_tx_descriptor_init(&desc->tx_dma_desc, chan);
desc->tx_dma_desc.tx_submit = at_xdmac_tx_submit;
desc->tx_dma_desc.phys = phys;
}
return desc;
}
static void at_xdmac_init_used_desc(struct at_xdmac_desc *desc)
{
memset(&desc->lld, 0, sizeof(desc->lld));
INIT_LIST_HEAD(&desc->descs_list);
desc->direction = DMA_TRANS_NONE;
desc->xfer_size = 0;
desc->active_xfer = false;
}
/* Call must be protected by lock. */
static struct at_xdmac_desc *at_xdmac_get_desc(struct at_xdmac_chan *atchan)
{
struct at_xdmac_desc *desc;
if (list_empty(&atchan->free_descs_list)) {
desc = at_xdmac_alloc_desc(&atchan->chan, GFP_NOWAIT);
} else {
desc = list_first_entry(&atchan->free_descs_list,
struct at_xdmac_desc, desc_node);
list_del(&desc->desc_node);
at_xdmac_init_used_desc(desc);
}
return desc;
}
static void at_xdmac_queue_desc(struct dma_chan *chan,
struct at_xdmac_desc *prev,
struct at_xdmac_desc *desc)
{
if (!prev || !desc)
return;
prev->lld.mbr_nda = desc->tx_dma_desc.phys;
prev->lld.mbr_ubc |= AT_XDMAC_MBR_UBC_NDE;
dev_dbg(chan2dev(chan), "%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
__func__, prev, &prev->lld.mbr_nda);
}
static inline void at_xdmac_increment_block_count(struct dma_chan *chan,
struct at_xdmac_desc *desc)
{
if (!desc)
return;
desc->lld.mbr_bc++;
dev_dbg(chan2dev(chan),
"%s: incrementing the block count of the desc 0x%p\n",
__func__, desc);
}
static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec,
struct of_dma *of_dma)
{
struct at_xdmac *atxdmac = of_dma->of_dma_data;
struct at_xdmac_chan *atchan;
struct dma_chan *chan;
struct device *dev = atxdmac->dma.dev;
if (dma_spec->args_count != 1) {
dev_err(dev, "dma phandler args: bad number of args\n");
return NULL;
}
chan = dma_get_any_slave_channel(&atxdmac->dma);
if (!chan) {
dev_err(dev, "can't get a dma channel\n");
return NULL;
}
atchan = to_at_xdmac_chan(chan);
atchan->memif = AT91_XDMAC_DT_GET_MEM_IF(dma_spec->args[0]);
atchan->perif = AT91_XDMAC_DT_GET_PER_IF(dma_spec->args[0]);
atchan->perid = AT91_XDMAC_DT_GET_PERID(dma_spec->args[0]);
dev_dbg(dev, "chan dt cfg: memif=%u perif=%u perid=%u\n",
atchan->memif, atchan->perif, atchan->perid);
return chan;
}
static int at_xdmac_compute_chan_conf(struct dma_chan *chan,
enum dma_transfer_direction direction)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
int csize, dwidth;
if (direction == DMA_DEV_TO_MEM) {
atchan->cfg =
AT91_XDMAC_DT_PERID(atchan->perid)
| AT_XDMAC_CC_DAM_INCREMENTED_AM
| AT_XDMAC_CC_SAM_FIXED_AM
| AT_XDMAC_CC_SWREQ_HWR_CONNECTED
| AT_XDMAC_CC_DSYNC_PER2MEM
| AT_XDMAC_CC_MBSIZE_SIXTEEN
| AT_XDMAC_CC_TYPE_PER_TRAN;
if (atxdmac->layout->sdif)
atchan->cfg |= AT_XDMAC_CC_DIF(atchan->memif) |
AT_XDMAC_CC_SIF(atchan->perif);
csize = ffs(atchan->sconfig.src_maxburst) - 1;
if (csize < 0) {
dev_err(chan2dev(chan), "invalid src maxburst value\n");
return -EINVAL;
}
atchan->cfg |= AT_XDMAC_CC_CSIZE(csize);
dwidth = ffs(atchan->sconfig.src_addr_width) - 1;
if (dwidth < 0) {
dev_err(chan2dev(chan), "invalid src addr width value\n");
return -EINVAL;
}
atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth);
} else if (direction == DMA_MEM_TO_DEV) {
atchan->cfg =
AT91_XDMAC_DT_PERID(atchan->perid)
| AT_XDMAC_CC_DAM_FIXED_AM
| AT_XDMAC_CC_SAM_INCREMENTED_AM
| AT_XDMAC_CC_SWREQ_HWR_CONNECTED
| AT_XDMAC_CC_DSYNC_MEM2PER
| AT_XDMAC_CC_MBSIZE_SIXTEEN
| AT_XDMAC_CC_TYPE_PER_TRAN;
if (atxdmac->layout->sdif)
atchan->cfg |= AT_XDMAC_CC_DIF(atchan->perif) |
AT_XDMAC_CC_SIF(atchan->memif);
csize = ffs(atchan->sconfig.dst_maxburst) - 1;
if (csize < 0) {
dev_err(chan2dev(chan), "invalid src maxburst value\n");
return -EINVAL;
}
atchan->cfg |= AT_XDMAC_CC_CSIZE(csize);
dwidth = ffs(atchan->sconfig.dst_addr_width) - 1;
if (dwidth < 0) {
dev_err(chan2dev(chan), "invalid dst addr width value\n");
return -EINVAL;
}
atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth);
}
dev_dbg(chan2dev(chan), "%s: cfg=0x%08x\n", __func__, atchan->cfg);
return 0;
}
/*
* Only check that maxburst and addr width values are supported by
* the controller but not that the configuration is good to perform the
* transfer since we don't know the direction at this stage.
*/
static int at_xdmac_check_slave_config(struct dma_slave_config *sconfig)
{
if ((sconfig->src_maxburst > AT_XDMAC_MAX_CSIZE)
|| (sconfig->dst_maxburst > AT_XDMAC_MAX_CSIZE))
return -EINVAL;
if ((sconfig->src_addr_width > AT_XDMAC_MAX_DWIDTH)
|| (sconfig->dst_addr_width > AT_XDMAC_MAX_DWIDTH))
return -EINVAL;
return 0;
}
static int at_xdmac_set_slave_config(struct dma_chan *chan,
struct dma_slave_config *sconfig)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
if (at_xdmac_check_slave_config(sconfig)) {
dev_err(chan2dev(chan), "invalid slave configuration\n");
return -EINVAL;
}
memcpy(&atchan->sconfig, sconfig, sizeof(atchan->sconfig));
return 0;
}
static struct dma_async_tx_descriptor *
at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *first = NULL, *prev = NULL;
struct scatterlist *sg;
int i;
unsigned int xfer_size = 0;
unsigned long irqflags;
struct dma_async_tx_descriptor *ret = NULL;
if (!sgl)
return NULL;
if (!is_slave_direction(direction)) {
dev_err(chan2dev(chan), "invalid DMA direction\n");
return NULL;
}
dev_dbg(chan2dev(chan), "%s: sg_len=%d, dir=%s, flags=0x%lx\n",
__func__, sg_len,
direction == DMA_MEM_TO_DEV ? "to device" : "from device",
flags);
/* Protect dma_sconfig field that can be modified by set_slave_conf. */
spin_lock_irqsave(&atchan->lock, irqflags);
if (at_xdmac_compute_chan_conf(chan, direction))
goto spin_unlock;
/* Prepare descriptors. */
for_each_sg(sgl, sg, sg_len, i) {
struct at_xdmac_desc *desc = NULL;
u32 len, mem, dwidth, fixed_dwidth;
len = sg_dma_len(sg);
mem = sg_dma_address(sg);
if (unlikely(!len)) {
dev_err(chan2dev(chan), "sg data length is zero\n");
goto spin_unlock;
}
dev_dbg(chan2dev(chan), "%s: * sg%d len=%u, mem=0x%08x\n",
__func__, i, len, mem);
desc = at_xdmac_get_desc(atchan);
if (!desc) {
dev_err(chan2dev(chan), "can't get descriptor\n");
if (first)
list_splice_tail_init(&first->descs_list,
&atchan->free_descs_list);
goto spin_unlock;
}
/* Linked list descriptor setup. */
if (direction == DMA_DEV_TO_MEM) {
desc->lld.mbr_sa = atchan->sconfig.src_addr;
desc->lld.mbr_da = mem;
} else {
desc->lld.mbr_sa = mem;
desc->lld.mbr_da = atchan->sconfig.dst_addr;
}
dwidth = at_xdmac_get_dwidth(atchan->cfg);
fixed_dwidth = IS_ALIGNED(len, 1 << dwidth)
? dwidth
: AT_XDMAC_CC_DWIDTH_BYTE;
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 /* next descriptor view */
| AT_XDMAC_MBR_UBC_NDEN /* next descriptor dst parameter update */
| AT_XDMAC_MBR_UBC_NSEN /* next descriptor src parameter update */
| (len >> fixed_dwidth); /* microblock length */
desc->lld.mbr_cfg = (atchan->cfg & ~AT_XDMAC_CC_DWIDTH_MASK) |
AT_XDMAC_CC_DWIDTH(fixed_dwidth);
dev_dbg(chan2dev(chan),
"%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n",
__func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc);
/* Chain lld. */
if (prev)
at_xdmac_queue_desc(chan, prev, desc);
prev = desc;
if (!first)
first = desc;
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
__func__, desc, first);
list_add_tail(&desc->desc_node, &first->descs_list);
xfer_size += len;
}
first->tx_dma_desc.flags = flags;
first->xfer_size = xfer_size;
first->direction = direction;
ret = &first->tx_dma_desc;
spin_unlock:
spin_unlock_irqrestore(&atchan->lock, irqflags);
return ret;
}
static struct dma_async_tx_descriptor *
at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
size_t buf_len, size_t period_len,
enum dma_transfer_direction direction,
unsigned long flags)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *first = NULL, *prev = NULL;
unsigned int periods = buf_len / period_len;
int i;
unsigned long irqflags;
dev_dbg(chan2dev(chan), "%s: buf_addr=%pad, buf_len=%zd, period_len=%zd, dir=%s, flags=0x%lx\n",
__func__, &buf_addr, buf_len, period_len,
direction == DMA_MEM_TO_DEV ? "mem2per" : "per2mem", flags);
if (!is_slave_direction(direction)) {
dev_err(chan2dev(chan), "invalid DMA direction\n");
return NULL;
}
if (test_and_set_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status)) {
dev_err(chan2dev(chan), "channel currently used\n");
return NULL;
}
if (at_xdmac_compute_chan_conf(chan, direction))
return NULL;
for (i = 0; i < periods; i++) {
struct at_xdmac_desc *desc = NULL;
spin_lock_irqsave(&atchan->lock, irqflags);
desc = at_xdmac_get_desc(atchan);
if (!desc) {
dev_err(chan2dev(chan), "can't get descriptor\n");
if (first)
list_splice_tail_init(&first->descs_list,
&atchan->free_descs_list);
spin_unlock_irqrestore(&atchan->lock, irqflags);
return NULL;
}
spin_unlock_irqrestore(&atchan->lock, irqflags);
dev_dbg(chan2dev(chan),
"%s: desc=0x%p, tx_dma_desc.phys=%pad\n",
__func__, desc, &desc->tx_dma_desc.phys);
if (direction == DMA_DEV_TO_MEM) {
desc->lld.mbr_sa = atchan->sconfig.src_addr;
desc->lld.mbr_da = buf_addr + i * period_len;
} else {
desc->lld.mbr_sa = buf_addr + i * period_len;
desc->lld.mbr_da = atchan->sconfig.dst_addr;
}
desc->lld.mbr_cfg = atchan->cfg;
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1
| AT_XDMAC_MBR_UBC_NDEN
| AT_XDMAC_MBR_UBC_NSEN
| period_len >> at_xdmac_get_dwidth(desc->lld.mbr_cfg);
dev_dbg(chan2dev(chan),
"%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n",
__func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc);
/* Chain lld. */
if (prev)
at_xdmac_queue_desc(chan, prev, desc);
prev = desc;
if (!first)
first = desc;
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
__func__, desc, first);
list_add_tail(&desc->desc_node, &first->descs_list);
}
at_xdmac_queue_desc(chan, prev, first);
first->tx_dma_desc.flags = flags;
first->xfer_size = buf_len;
first->direction = direction;
return &first->tx_dma_desc;
}
static inline u32 at_xdmac_align_width(struct dma_chan *chan, dma_addr_t addr)
{
u32 width;
/*
* Check address alignment to select the greater data width we
* can use.
*
* Some XDMAC implementations don't provide dword transfer, in
* this case selecting dword has the same behavior as
* selecting word transfers.
*/
if (!(addr & 7)) {
width = AT_XDMAC_CC_DWIDTH_DWORD;
dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__);
} else if (!(addr & 3)) {
width = AT_XDMAC_CC_DWIDTH_WORD;
dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__);
} else if (!(addr & 1)) {
width = AT_XDMAC_CC_DWIDTH_HALFWORD;
dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__);
} else {
width = AT_XDMAC_CC_DWIDTH_BYTE;
dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__);
}
return width;
}
static struct at_xdmac_desc *
at_xdmac_interleaved_queue_desc(struct dma_chan *chan,
struct at_xdmac_chan *atchan,
struct at_xdmac_desc *prev,
dma_addr_t src, dma_addr_t dst,
struct dma_interleaved_template *xt,
struct data_chunk *chunk)
{
struct at_xdmac_desc *desc;
u32 dwidth;
unsigned long flags;
size_t ublen;
/*
* WARNING: The channel configuration is set here since there is no
* dmaengine_slave_config call in this case. Moreover we don't know the
* direction, it involves we can't dynamically set the source and dest
* interface so we have to use the same one. Only interface 0 allows EBI
* access. Hopefully we can access DDR through both ports (at least on
* SAMA5D4x), so we can use the same interface for source and dest,
* that solves the fact we don't know the direction.
* ERRATA: Even if useless for memory transfers, the PERID has to not
* match the one of another channel. If not, it could lead to spurious
* flag status.
* For SAMA7G5x case, the SIF and DIF fields are no longer used.
* Thus, no need to have the SIF/DIF interfaces here.
* For SAMA5D4x and SAMA5D2x the SIF and DIF are already configured as
* zero.
*/
u32 chan_cc = AT_XDMAC_CC_PERID(0x7f)
| AT_XDMAC_CC_MBSIZE_SIXTEEN
| AT_XDMAC_CC_TYPE_MEM_TRAN;
dwidth = at_xdmac_align_width(chan, src | dst | chunk->size);
if (chunk->size >= (AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)) {
dev_dbg(chan2dev(chan),
"%s: chunk too big (%zu, max size %lu)...\n",
__func__, chunk->size,
AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth);
return NULL;
}
if (prev)
dev_dbg(chan2dev(chan),
"Adding items at the end of desc 0x%p\n", prev);
if (xt->src_inc) {
if (xt->src_sgl)
chan_cc |= AT_XDMAC_CC_SAM_UBS_AM;
else
chan_cc |= AT_XDMAC_CC_SAM_INCREMENTED_AM;
}
if (xt->dst_inc) {
if (xt->dst_sgl)
chan_cc |= AT_XDMAC_CC_DAM_UBS_AM;
else
chan_cc |= AT_XDMAC_CC_DAM_INCREMENTED_AM;
}
spin_lock_irqsave(&atchan->lock, flags);
desc = at_xdmac_get_desc(atchan);
spin_unlock_irqrestore(&atchan->lock, flags);
if (!desc) {
dev_err(chan2dev(chan), "can't get descriptor\n");
return NULL;
}
chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
ublen = chunk->size >> dwidth;
desc->lld.mbr_sa = src;
desc->lld.mbr_da = dst;
desc->lld.mbr_sus = dmaengine_get_src_icg(xt, chunk);
desc->lld.mbr_dus = dmaengine_get_dst_icg(xt, chunk);
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV3
| AT_XDMAC_MBR_UBC_NDEN
| AT_XDMAC_MBR_UBC_NSEN
| ublen;
desc->lld.mbr_cfg = chan_cc;
dev_dbg(chan2dev(chan),
"%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
__func__, &desc->lld.mbr_sa, &desc->lld.mbr_da,
desc->lld.mbr_ubc, desc->lld.mbr_cfg);
/* Chain lld. */
if (prev)
at_xdmac_queue_desc(chan, prev, desc);
return desc;
}
static struct dma_async_tx_descriptor *
at_xdmac_prep_interleaved(struct dma_chan *chan,
struct dma_interleaved_template *xt,
unsigned long flags)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *prev = NULL, *first = NULL;
dma_addr_t dst_addr, src_addr;
size_t src_skip = 0, dst_skip = 0, len = 0;
struct data_chunk *chunk;
int i;
if (!xt || !xt->numf || (xt->dir != DMA_MEM_TO_MEM))
return NULL;
/*
* TODO: Handle the case where we have to repeat a chain of
* descriptors...
*/
if ((xt->numf > 1) && (xt->frame_size > 1))
return NULL;
dev_dbg(chan2dev(chan), "%s: src=%pad, dest=%pad, numf=%zu, frame_size=%zu, flags=0x%lx\n",
__func__, &xt->src_start, &xt->dst_start, xt->numf,
xt->frame_size, flags);
src_addr = xt->src_start;
dst_addr = xt->dst_start;
if (xt->numf > 1) {
first = at_xdmac_interleaved_queue_desc(chan, atchan,
NULL,
src_addr, dst_addr,
xt, xt->sgl);
if (!first)
return NULL;
/* Length of the block is (BLEN+1) microblocks. */
for (i = 0; i < xt->numf - 1; i++)
at_xdmac_increment_block_count(chan, first);
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
__func__, first, first);
list_add_tail(&first->desc_node, &first->descs_list);
} else {
for (i = 0; i < xt->frame_size; i++) {
size_t src_icg = 0, dst_icg = 0;
struct at_xdmac_desc *desc;
chunk = xt->sgl + i;
dst_icg = dmaengine_get_dst_icg(xt, chunk);
src_icg = dmaengine_get_src_icg(xt, chunk);
src_skip = chunk->size + src_icg;
dst_skip = chunk->size + dst_icg;
dev_dbg(chan2dev(chan),
"%s: chunk size=%zu, src icg=%zu, dst icg=%zu\n",
__func__, chunk->size, src_icg, dst_icg);
desc = at_xdmac_interleaved_queue_desc(chan, atchan,
prev,
src_addr, dst_addr,
xt, chunk);
if (!desc) {
if (first)
list_splice_tail_init(&first->descs_list,
&atchan->free_descs_list);
return NULL;
}
if (!first)
first = desc;
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
__func__, desc, first);
list_add_tail(&desc->desc_node, &first->descs_list);
if (xt->src_sgl)
src_addr += src_skip;
if (xt->dst_sgl)
dst_addr += dst_skip;
len += chunk->size;
prev = desc;
}
}
first->tx_dma_desc.cookie = -EBUSY;
first->tx_dma_desc.flags = flags;
first->xfer_size = len;
return &first->tx_dma_desc;
}
static struct dma_async_tx_descriptor *
at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *first = NULL, *prev = NULL;
size_t remaining_size = len, xfer_size = 0, ublen;
dma_addr_t src_addr = src, dst_addr = dest;
u32 dwidth;
/*
* WARNING: We don't know the direction, it involves we can't
* dynamically set the source and dest interface so we have to use the
* same one. Only interface 0 allows EBI access. Hopefully we can
* access DDR through both ports (at least on SAMA5D4x), so we can use
* the same interface for source and dest, that solves the fact we
* don't know the direction.
* ERRATA: Even if useless for memory transfers, the PERID has to not
* match the one of another channel. If not, it could lead to spurious
* flag status.
* For SAMA7G5x case, the SIF and DIF fields are no longer used.
* Thus, no need to have the SIF/DIF interfaces here.
* For SAMA5D4x and SAMA5D2x the SIF and DIF are already configured as
* zero.
*/
u32 chan_cc = AT_XDMAC_CC_PERID(0x7f)
| AT_XDMAC_CC_DAM_INCREMENTED_AM
| AT_XDMAC_CC_SAM_INCREMENTED_AM
| AT_XDMAC_CC_MBSIZE_SIXTEEN
| AT_XDMAC_CC_TYPE_MEM_TRAN;
unsigned long irqflags;
dev_dbg(chan2dev(chan), "%s: src=%pad, dest=%pad, len=%zd, flags=0x%lx\n",
__func__, &src, &dest, len, flags);
if (unlikely(!len))
return NULL;
dwidth = at_xdmac_align_width(chan, src_addr | dst_addr);
/* Prepare descriptors. */
while (remaining_size) {
struct at_xdmac_desc *desc = NULL;
dev_dbg(chan2dev(chan), "%s: remaining_size=%zu\n", __func__, remaining_size);
spin_lock_irqsave(&atchan->lock, irqflags);
desc = at_xdmac_get_desc(atchan);
spin_unlock_irqrestore(&atchan->lock, irqflags);
if (!desc) {
dev_err(chan2dev(chan), "can't get descriptor\n");
if (first)
list_splice_tail_init(&first->descs_list,
&atchan->free_descs_list);
return NULL;
}
/* Update src and dest addresses. */
src_addr += xfer_size;
dst_addr += xfer_size;
if (remaining_size >= AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)
xfer_size = AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth;
else
xfer_size = remaining_size;
dev_dbg(chan2dev(chan), "%s: xfer_size=%zu\n", __func__, xfer_size);
/* Check remaining length and change data width if needed. */
dwidth = at_xdmac_align_width(chan,
src_addr | dst_addr | xfer_size);
chan_cc &= ~AT_XDMAC_CC_DWIDTH_MASK;
chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
ublen = xfer_size >> dwidth;
remaining_size -= xfer_size;
desc->lld.mbr_sa = src_addr;
desc->lld.mbr_da = dst_addr;
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2
| AT_XDMAC_MBR_UBC_NDEN
| AT_XDMAC_MBR_UBC_NSEN
| ublen;
desc->lld.mbr_cfg = chan_cc;
dev_dbg(chan2dev(chan),
"%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
__func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc, desc->lld.mbr_cfg);
/* Chain lld. */
if (prev)
at_xdmac_queue_desc(chan, prev, desc);
prev = desc;
if (!first)
first = desc;
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
__func__, desc, first);
list_add_tail(&desc->desc_node, &first->descs_list);
}
first->tx_dma_desc.flags = flags;
first->xfer_size = len;
return &first->tx_dma_desc;
}
static struct at_xdmac_desc *at_xdmac_memset_create_desc(struct dma_chan *chan,
struct at_xdmac_chan *atchan,
dma_addr_t dst_addr,
size_t len,
int value)
{
struct at_xdmac_desc *desc;
unsigned long flags;
size_t ublen;
u32 dwidth;
char pattern;
/*
* WARNING: The channel configuration is set here since there is no
* dmaengine_slave_config call in this case. Moreover we don't know the
* direction, it involves we can't dynamically set the source and dest
* interface so we have to use the same one. Only interface 0 allows EBI
* access. Hopefully we can access DDR through both ports (at least on
* SAMA5D4x), so we can use the same interface for source and dest,
* that solves the fact we don't know the direction.
* ERRATA: Even if useless for memory transfers, the PERID has to not
* match the one of another channel. If not, it could lead to spurious
* flag status.
* For SAMA7G5x case, the SIF and DIF fields are no longer used.
* Thus, no need to have the SIF/DIF interfaces here.
* For SAMA5D4x and SAMA5D2x the SIF and DIF are already configured as
* zero.
*/
u32 chan_cc = AT_XDMAC_CC_PERID(0x7f)
| AT_XDMAC_CC_DAM_UBS_AM
| AT_XDMAC_CC_SAM_INCREMENTED_AM
| AT_XDMAC_CC_MBSIZE_SIXTEEN
| AT_XDMAC_CC_MEMSET_HW_MODE
| AT_XDMAC_CC_TYPE_MEM_TRAN;
dwidth = at_xdmac_align_width(chan, dst_addr);
if (len >= (AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth)) {
dev_err(chan2dev(chan),
"%s: Transfer too large, aborting...\n",
__func__);
return NULL;
}
spin_lock_irqsave(&atchan->lock, flags);
desc = at_xdmac_get_desc(atchan);
spin_unlock_irqrestore(&atchan->lock, flags);
if (!desc) {
dev_err(chan2dev(chan), "can't get descriptor\n");
return NULL;
}
chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
/* Only the first byte of value is to be used according to dmaengine */
pattern = (char)value;
ublen = len >> dwidth;
desc->lld.mbr_da = dst_addr;
desc->lld.mbr_ds = (pattern << 24) |
(pattern << 16) |
(pattern << 8) |
pattern;
desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV3
| AT_XDMAC_MBR_UBC_NDEN
| AT_XDMAC_MBR_UBC_NSEN
| ublen;
desc->lld.mbr_cfg = chan_cc;
dev_dbg(chan2dev(chan),
"%s: lld: mbr_da=%pad, mbr_ds=0x%08x, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n",
__func__, &desc->lld.mbr_da, desc->lld.mbr_ds, desc->lld.mbr_ubc,
desc->lld.mbr_cfg);
return desc;
}
static struct dma_async_tx_descriptor *
at_xdmac_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
size_t len, unsigned long flags)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *desc;
dev_dbg(chan2dev(chan), "%s: dest=%pad, len=%zu, pattern=0x%x, flags=0x%lx\n",
__func__, &dest, len, value, flags);
if (unlikely(!len))
return NULL;
desc = at_xdmac_memset_create_desc(chan, atchan, dest, len, value);
list_add_tail(&desc->desc_node, &desc->descs_list);
desc->tx_dma_desc.cookie = -EBUSY;
desc->tx_dma_desc.flags = flags;
desc->xfer_size = len;
return &desc->tx_dma_desc;
}
static struct dma_async_tx_descriptor *
at_xdmac_prep_dma_memset_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, int value,
unsigned long flags)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *desc, *pdesc = NULL,
*ppdesc = NULL, *first = NULL;
struct scatterlist *sg, *psg = NULL, *ppsg = NULL;
size_t stride = 0, pstride = 0, len = 0;
int i;
if (!sgl)
return NULL;
dev_dbg(chan2dev(chan), "%s: sg_len=%d, value=0x%x, flags=0x%lx\n",
__func__, sg_len, value, flags);
/* Prepare descriptors. */
for_each_sg(sgl, sg, sg_len, i) {
dev_dbg(chan2dev(chan), "%s: dest=%pad, len=%d, pattern=0x%x, flags=0x%lx\n",
__func__, &sg_dma_address(sg), sg_dma_len(sg),
value, flags);
desc = at_xdmac_memset_create_desc(chan, atchan,
sg_dma_address(sg),
sg_dma_len(sg),
value);
if (!desc && first)
list_splice_tail_init(&first->descs_list,
&atchan->free_descs_list);
if (!first)
first = desc;
/* Update our strides */
pstride = stride;
if (psg)
stride = sg_dma_address(sg) -
(sg_dma_address(psg) + sg_dma_len(psg));
/*
* The scatterlist API gives us only the address and
* length of each elements.
*
* Unfortunately, we don't have the stride, which we
* will need to compute.
*
* That make us end up in a situation like this one:
* len stride len stride len
* +-------+ +-------+ +-------+
* | N-2 | | N-1 | | N |
* +-------+ +-------+ +-------+
*
* We need all these three elements (N-2, N-1 and N)
* to actually take the decision on whether we need to
* queue N-1 or reuse N-2.
*
* We will only consider N if it is the last element.
*/
if (ppdesc && pdesc) {
if ((stride == pstride) &&
(sg_dma_len(ppsg) == sg_dma_len(psg))) {
dev_dbg(chan2dev(chan),
"%s: desc 0x%p can be merged with desc 0x%p\n",
__func__, pdesc, ppdesc);
/*
* Increment the block count of the
* N-2 descriptor
*/
at_xdmac_increment_block_count(chan, ppdesc);
ppdesc->lld.mbr_dus = stride;
/*
* Put back the N-1 descriptor in the
* free descriptor list
*/
list_add_tail(&pdesc->desc_node,
&atchan->free_descs_list);
/*
* Make our N-1 descriptor pointer
* point to the N-2 since they were
* actually merged.
*/
pdesc = ppdesc;
/*
* Rule out the case where we don't have
* pstride computed yet (our second sg
* element)
*
* We also want to catch the case where there
* would be a negative stride,
*/
} else if (pstride ||
sg_dma_address(sg) < sg_dma_address(psg)) {
/*
* Queue the N-1 descriptor after the
* N-2
*/
at_xdmac_queue_desc(chan, ppdesc, pdesc);
/*
* Add the N-1 descriptor to the list
* of the descriptors used for this
* transfer
*/
list_add_tail(&desc->desc_node,
&first->descs_list);
dev_dbg(chan2dev(chan),
"%s: add desc 0x%p to descs_list 0x%p\n",
__func__, desc, first);
}
}
/*
* If we are the last element, just see if we have the
* same size than the previous element.
*
* If so, we can merge it with the previous descriptor
* since we don't care about the stride anymore.
*/
if ((i == (sg_len - 1)) &&
sg_dma_len(psg) == sg_dma_len(sg)) {
dev_dbg(chan2dev(chan),
"%s: desc 0x%p can be merged with desc 0x%p\n",
__func__, desc, pdesc);
/*
* Increment the block count of the N-1
* descriptor
*/
at_xdmac_increment_block_count(chan, pdesc);
pdesc->lld.mbr_dus = stride;
/*
* Put back the N descriptor in the free
* descriptor list
*/
list_add_tail(&desc->desc_node,
&atchan->free_descs_list);
}
/* Update our descriptors */
ppdesc = pdesc;
pdesc = desc;
/* Update our scatter pointers */
ppsg = psg;
psg = sg;
len += sg_dma_len(sg);
}
first->tx_dma_desc.cookie = -EBUSY;
first->tx_dma_desc.flags = flags;
first->xfer_size = len;
return &first->tx_dma_desc;
}
static enum dma_status
at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
struct at_xdmac_desc *desc, *_desc, *iter;
struct list_head *descs_list;
enum dma_status ret;
int residue, retry, pm_status;
u32 cur_nda, check_nda, cur_ubc, mask, value;
u8 dwidth = 0;
unsigned long flags;
bool initd;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
pm_status = pm_runtime_resume_and_get(atxdmac->dev);
if (pm_status < 0)
return DMA_ERROR;
spin_lock_irqsave(&atchan->lock, flags);
desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node);
/*
* If the transfer has not been started yet, don't need to compute the
* residue, it's the transfer length.
*/
if (!desc->active_xfer) {
dma_set_residue(txstate, desc->xfer_size);
goto spin_unlock;
}
residue = desc->xfer_size;
/*
* Flush FIFO: only relevant when the transfer is source peripheral
* synchronized. Flush is needed before reading CUBC because data in
* the FIFO are not reported by CUBC. Reporting a residue of the
* transfer length while we have data in FIFO can cause issue.
* Usecase: atmel USART has a timeout which means I have received
* characters but there is no more character received for a while. On
* timeout, it requests the residue. If the data are in the DMA FIFO,
* we will return a residue of the transfer length. It means no data
* received. If an application is waiting for these data, it will hang
* since we won't have another USART timeout without receiving new
* data.
*/
mask = AT_XDMAC_CC_TYPE | AT_XDMAC_CC_DSYNC;
value = AT_XDMAC_CC_TYPE_PER_TRAN | AT_XDMAC_CC_DSYNC_PER2MEM;
if ((desc->lld.mbr_cfg & mask) == value) {
at_xdmac_write(atxdmac, atxdmac->layout->gswf, atchan->mask);
while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS))
cpu_relax();
}
/*
* The easiest way to compute the residue should be to pause the DMA
* but doing this can lead to miss some data as some devices don't
* have FIFO.
* We need to read several registers because:
* - DMA is running therefore a descriptor change is possible while
* reading these registers
* - When the block transfer is done, the value of the CUBC register
* is set to its initial value until the fetch of the next descriptor.
* This value will corrupt the residue calculation so we have to skip
* it.
*
* INITD -------- ------------
* |____________________|
* _______________________ _______________
* NDA @desc2 \/ @desc3
* _______________________/\_______________
* __________ ___________ _______________
* CUBC 0 \/ MAX desc1 \/ MAX desc2
* __________/\___________/\_______________
*
* Since descriptors are aligned on 64 bits, we can assume that
* the update of NDA and CUBC is atomic.
* Memory barriers are used to ensure the read order of the registers.
* A max number of retries is set because unlikely it could never ends.
*/
for (retry = 0; retry < AT_XDMAC_RESIDUE_MAX_RETRIES; retry++) {
check_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc;
rmb();
cur_ubc = at_xdmac_chan_read(atchan, AT_XDMAC_CUBC);
rmb();
initd = !!(at_xdmac_chan_read(atchan, AT_XDMAC_CC) & AT_XDMAC_CC_INITD);
rmb();
cur_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc;
rmb();
if ((check_nda == cur_nda) && initd)
break;
}
if (unlikely(retry >= AT_XDMAC_RESIDUE_MAX_RETRIES)) {
ret = DMA_ERROR;
goto spin_unlock;
}
/*
* Flush FIFO: only relevant when the transfer is source peripheral
* synchronized. Another flush is needed here because CUBC is updated
* when the controller sends the data write command. It can lead to
* report data that are not written in the memory or the device. The
* FIFO flush ensures that data are really written.
*/
if ((desc->lld.mbr_cfg & mask) == value) {
at_xdmac_write(atxdmac, atxdmac->layout->gswf, atchan->mask);
while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS))
cpu_relax();
}
/*
* Remove size of all microblocks already transferred and the current
* one. Then add the remaining size to transfer of the current
* microblock.
*/
descs_list = &desc->descs_list;
list_for_each_entry_safe(iter, _desc, descs_list, desc_node) {
dwidth = at_xdmac_get_dwidth(iter->lld.mbr_cfg);
residue -= (iter->lld.mbr_ubc & 0xffffff) << dwidth;
if ((iter->lld.mbr_nda & 0xfffffffc) == cur_nda) {
desc = iter;
break;
}
}
residue += cur_ubc << dwidth;
dma_set_residue(txstate, residue);
dev_dbg(chan2dev(chan),
"%s: desc=0x%p, tx_dma_desc.phys=%pad, tx_status=%d, cookie=%d, residue=%d\n",
__func__, desc, &desc->tx_dma_desc.phys, ret, cookie, residue);
spin_unlock:
spin_unlock_irqrestore(&atchan->lock, flags);
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
return ret;
}
static void at_xdmac_advance_work(struct at_xdmac_chan *atchan)
{
struct at_xdmac_desc *desc;
/*
* If channel is enabled, do nothing, advance_work will be triggered
* after the interruption.
*/
if (at_xdmac_chan_is_enabled(atchan) || list_empty(&atchan->xfers_list))
return;
desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc,
xfer_node);
dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
if (!desc->active_xfer)
at_xdmac_start_xfer(atchan, desc);
}
static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan)
{
struct at_xdmac_desc *desc;
struct dma_async_tx_descriptor *txd;
spin_lock_irq(&atchan->lock);
dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08x\n",
__func__, atchan->irq_status);
if (list_empty(&atchan->xfers_list)) {
spin_unlock_irq(&atchan->lock);
return;
}
desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc,
xfer_node);
spin_unlock_irq(&atchan->lock);
txd = &desc->tx_dma_desc;
if (txd->flags & DMA_PREP_INTERRUPT)
dmaengine_desc_get_callback_invoke(txd, NULL);
}
/* Called with atchan->lock held. */
static void at_xdmac_handle_error(struct at_xdmac_chan *atchan)
{
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
struct at_xdmac_desc *bad_desc;
int ret;
ret = pm_runtime_resume_and_get(atxdmac->dev);
if (ret < 0)
return;
/*
* The descriptor currently at the head of the active list is
* broken. Since we don't have any way to report errors, we'll
* just have to scream loudly and try to continue with other
* descriptors queued (if any).
*/
if (atchan->irq_status & AT_XDMAC_CIS_RBEIS)
dev_err(chan2dev(&atchan->chan), "read bus error!!!");
if (atchan->irq_status & AT_XDMAC_CIS_WBEIS)
dev_err(chan2dev(&atchan->chan), "write bus error!!!");
if (atchan->irq_status & AT_XDMAC_CIS_ROIS)
dev_err(chan2dev(&atchan->chan), "request overflow error!!!");
/* Channel must be disabled first as it's not done automatically */
at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask);
while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask)
cpu_relax();
bad_desc = list_first_entry(&atchan->xfers_list,
struct at_xdmac_desc,
xfer_node);
/* Print bad descriptor's details if needed */
dev_dbg(chan2dev(&atchan->chan),
"%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n",
__func__, &bad_desc->lld.mbr_sa, &bad_desc->lld.mbr_da,
bad_desc->lld.mbr_ubc);
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
/* Then continue with usual descriptor management */
}
static void at_xdmac_tasklet(struct tasklet_struct *t)
{
struct at_xdmac_chan *atchan = from_tasklet(atchan, t, tasklet);
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
struct at_xdmac_desc *desc;
struct dma_async_tx_descriptor *txd;
u32 error_mask;
if (at_xdmac_chan_is_cyclic(atchan))
return at_xdmac_handle_cyclic(atchan);
error_mask = AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS |
AT_XDMAC_CIS_ROIS;
spin_lock_irq(&atchan->lock);
dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08x\n",
__func__, atchan->irq_status);
if (!(atchan->irq_status & AT_XDMAC_CIS_LIS) &&
!(atchan->irq_status & error_mask)) {
spin_unlock_irq(&atchan->lock);
return;
}
if (atchan->irq_status & error_mask)
at_xdmac_handle_error(atchan);
desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc,
xfer_node);
dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
if (!desc->active_xfer) {
dev_err(chan2dev(&atchan->chan), "Xfer not active: exiting");
spin_unlock_irq(&atchan->lock);
return;
}
txd = &desc->tx_dma_desc;
dma_cookie_complete(txd);
/* Remove the transfer from the transfer list. */
list_del(&desc->xfer_node);
spin_unlock_irq(&atchan->lock);
if (txd->flags & DMA_PREP_INTERRUPT)
dmaengine_desc_get_callback_invoke(txd, NULL);
dma_run_dependencies(txd);
spin_lock_irq(&atchan->lock);
/* Move the xfer descriptors into the free descriptors list. */
list_splice_tail_init(&desc->descs_list, &atchan->free_descs_list);
at_xdmac_advance_work(atchan);
spin_unlock_irq(&atchan->lock);
/*
* Decrement runtime PM ref counter incremented in
* at_xdmac_start_xfer().
*/
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
}
static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id)
{
struct at_xdmac *atxdmac = (struct at_xdmac *)dev_id;
struct at_xdmac_chan *atchan;
u32 imr, status, pending;
u32 chan_imr, chan_status;
int i, ret = IRQ_NONE;
do {
imr = at_xdmac_read(atxdmac, AT_XDMAC_GIM);
status = at_xdmac_read(atxdmac, AT_XDMAC_GIS);
pending = status & imr;
dev_vdbg(atxdmac->dma.dev,
"%s: status=0x%08x, imr=0x%08x, pending=0x%08x\n",
__func__, status, imr, pending);
if (!pending)
break;
/* We have to find which channel has generated the interrupt. */
for (i = 0; i < atxdmac->dma.chancnt; i++) {
if (!((1 << i) & pending))
continue;
atchan = &atxdmac->chan[i];
chan_imr = at_xdmac_chan_read(atchan, AT_XDMAC_CIM);
chan_status = at_xdmac_chan_read(atchan, AT_XDMAC_CIS);
atchan->irq_status = chan_status & chan_imr;
dev_vdbg(atxdmac->dma.dev,
"%s: chan%d: imr=0x%x, status=0x%x\n",
__func__, i, chan_imr, chan_status);
dev_vdbg(chan2dev(&atchan->chan),
"%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n",
__func__,
at_xdmac_chan_read(atchan, AT_XDMAC_CC),
at_xdmac_chan_read(atchan, AT_XDMAC_CNDA),
at_xdmac_chan_read(atchan, AT_XDMAC_CNDC),
at_xdmac_chan_read(atchan, AT_XDMAC_CSA),
at_xdmac_chan_read(atchan, AT_XDMAC_CDA),
at_xdmac_chan_read(atchan, AT_XDMAC_CUBC));
if (atchan->irq_status & (AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS))
at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask);
tasklet_schedule(&atchan->tasklet);
ret = IRQ_HANDLED;
}
} while (pending);
return ret;
}
static void at_xdmac_issue_pending(struct dma_chan *chan)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
unsigned long flags;
dev_dbg(chan2dev(&atchan->chan), "%s\n", __func__);
spin_lock_irqsave(&atchan->lock, flags);
at_xdmac_advance_work(atchan);
spin_unlock_irqrestore(&atchan->lock, flags);
return;
}
static int at_xdmac_device_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
int ret;
unsigned long flags;
dev_dbg(chan2dev(chan), "%s\n", __func__);
spin_lock_irqsave(&atchan->lock, flags);
ret = at_xdmac_set_slave_config(chan, config);
spin_unlock_irqrestore(&atchan->lock, flags);
return ret;
}
static void at_xdmac_device_pause_set(struct at_xdmac *atxdmac,
struct at_xdmac_chan *atchan)
{
at_xdmac_write(atxdmac, atxdmac->layout->grws, atchan->mask);
while (at_xdmac_chan_read(atchan, AT_XDMAC_CC) &
(AT_XDMAC_CC_WRIP | AT_XDMAC_CC_RDIP))
cpu_relax();
}
static void at_xdmac_device_pause_internal(struct at_xdmac_chan *atchan)
{
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
unsigned long flags;
spin_lock_irqsave(&atchan->lock, flags);
set_bit(AT_XDMAC_CHAN_IS_PAUSED_INTERNAL, &atchan->status);
at_xdmac_device_pause_set(atxdmac, atchan);
spin_unlock_irqrestore(&atchan->lock, flags);
}
static int at_xdmac_device_pause(struct dma_chan *chan)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
unsigned long flags;
int ret;
dev_dbg(chan2dev(chan), "%s\n", __func__);
if (test_and_set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status))
return 0;
ret = pm_runtime_resume_and_get(atxdmac->dev);
if (ret < 0)
return ret;
spin_lock_irqsave(&atchan->lock, flags);
at_xdmac_device_pause_set(atxdmac, atchan);
/* Decrement runtime PM ref counter for each active descriptor. */
at_xdmac_runtime_suspend_descriptors(atchan);
spin_unlock_irqrestore(&atchan->lock, flags);
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
return 0;
}
static void at_xdmac_device_resume_internal(struct at_xdmac_chan *atchan)
{
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
unsigned long flags;
spin_lock_irqsave(&atchan->lock, flags);
at_xdmac_write(atxdmac, atxdmac->layout->grwr, atchan->mask);
clear_bit(AT_XDMAC_CHAN_IS_PAUSED_INTERNAL, &atchan->status);
spin_unlock_irqrestore(&atchan->lock, flags);
}
static int at_xdmac_device_resume(struct dma_chan *chan)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
unsigned long flags;
int ret;
dev_dbg(chan2dev(chan), "%s\n", __func__);
ret = pm_runtime_resume_and_get(atxdmac->dev);
if (ret < 0)
return ret;
spin_lock_irqsave(&atchan->lock, flags);
if (!at_xdmac_chan_is_paused(atchan))
goto unlock;
/* Increment runtime PM ref counter for each active descriptor. */
ret = at_xdmac_runtime_resume_descriptors(atchan);
if (ret < 0)
goto unlock;
at_xdmac_write(atxdmac, atxdmac->layout->grwr, atchan->mask);
clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
unlock:
spin_unlock_irqrestore(&atchan->lock, flags);
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
return ret;
}
static int at_xdmac_device_terminate_all(struct dma_chan *chan)
{
struct at_xdmac_desc *desc, *_desc;
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
unsigned long flags;
int ret;
dev_dbg(chan2dev(chan), "%s\n", __func__);
ret = pm_runtime_resume_and_get(atxdmac->dev);
if (ret < 0)
return ret;
spin_lock_irqsave(&atchan->lock, flags);
at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask);
while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask)
cpu_relax();
/* Cancel all pending transfers. */
list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) {
list_del(&desc->xfer_node);
list_splice_tail_init(&desc->descs_list,
&atchan->free_descs_list);
/*
* We incremented the runtime PM reference count on
* at_xdmac_start_xfer() for this descriptor. Now it's time
* to release it.
*/
if (desc->active_xfer) {
pm_runtime_put_autosuspend(atxdmac->dev);
pm_runtime_mark_last_busy(atxdmac->dev);
}
}
clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
spin_unlock_irqrestore(&atchan->lock, flags);
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
return 0;
}
static int at_xdmac_alloc_chan_resources(struct dma_chan *chan)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *desc;
int i;
if (at_xdmac_chan_is_enabled(atchan)) {
dev_err(chan2dev(chan),
"can't allocate channel resources (channel enabled)\n");
return -EIO;
}
if (!list_empty(&atchan->free_descs_list)) {
dev_err(chan2dev(chan),
"can't allocate channel resources (channel not free from a previous use)\n");
return -EIO;
}
for (i = 0; i < init_nr_desc_per_channel; i++) {
desc = at_xdmac_alloc_desc(chan, GFP_KERNEL);
if (!desc) {
if (i == 0) {
dev_warn(chan2dev(chan),
"can't allocate any descriptors\n");
return -EIO;
}
dev_warn(chan2dev(chan),
"only %d descriptors have been allocated\n", i);
break;
}
list_add_tail(&desc->desc_node, &atchan->free_descs_list);
}
dma_cookie_init(chan);
dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
return i;
}
static void at_xdmac_free_chan_resources(struct dma_chan *chan)
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac *atxdmac = to_at_xdmac(chan->device);
struct at_xdmac_desc *desc, *_desc;
list_for_each_entry_safe(desc, _desc, &atchan->free_descs_list, desc_node) {
dev_dbg(chan2dev(chan), "%s: freeing descriptor %p\n", __func__, desc);
list_del(&desc->desc_node);
dma_pool_free(atxdmac->at_xdmac_desc_pool, desc, desc->tx_dma_desc.phys);
}
return;
}
static void at_xdmac_axi_config(struct platform_device *pdev)
{
struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev);
bool dev_m2m = false;
u32 dma_requests;
if (!atxdmac->layout->axi_config)
return; /* Not supported */
if (!of_property_read_u32(pdev->dev.of_node, "dma-requests",
&dma_requests)) {
dev_info(&pdev->dev, "controller in mem2mem mode.\n");
dev_m2m = true;
}
if (dev_m2m) {
at_xdmac_write(atxdmac, AT_XDMAC_GCFG, AT_XDMAC_GCFG_M2M);
at_xdmac_write(atxdmac, AT_XDMAC_GWAC, AT_XDMAC_GWAC_M2M);
} else {
at_xdmac_write(atxdmac, AT_XDMAC_GCFG, AT_XDMAC_GCFG_P2M);
at_xdmac_write(atxdmac, AT_XDMAC_GWAC, AT_XDMAC_GWAC_P2M);
}
}
static int __maybe_unused atmel_xdmac_prepare(struct device *dev)
{
struct at_xdmac *atxdmac = dev_get_drvdata(dev);
struct dma_chan *chan, *_chan;
list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) {
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
/* Wait for transfer completion, except in cyclic case. */
if (at_xdmac_chan_is_enabled(atchan) && !at_xdmac_chan_is_cyclic(atchan))
return -EAGAIN;
}
return 0;
}
static int __maybe_unused atmel_xdmac_suspend(struct device *dev)
{
struct at_xdmac *atxdmac = dev_get_drvdata(dev);
struct dma_chan *chan, *_chan;
int ret;
ret = pm_runtime_resume_and_get(atxdmac->dev);
if (ret < 0)
return ret;
list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) {
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
atchan->save_cc = at_xdmac_chan_read(atchan, AT_XDMAC_CC);
if (at_xdmac_chan_is_cyclic(atchan)) {
if (!at_xdmac_chan_is_paused(atchan)) {
dev_warn(chan2dev(chan), "%s: channel %d not paused\n",
__func__, chan->chan_id);
at_xdmac_device_pause_internal(atchan);
at_xdmac_runtime_suspend_descriptors(atchan);
}
atchan->save_cim = at_xdmac_chan_read(atchan, AT_XDMAC_CIM);
atchan->save_cnda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA);
atchan->save_cndc = at_xdmac_chan_read(atchan, AT_XDMAC_CNDC);
}
}
atxdmac->save_gim = at_xdmac_read(atxdmac, AT_XDMAC_GIM);
atxdmac->save_gs = at_xdmac_read(atxdmac, AT_XDMAC_GS);
at_xdmac_off(atxdmac, false);
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_noidle(atxdmac->dev);
clk_disable_unprepare(atxdmac->clk);
return 0;
}
static int __maybe_unused atmel_xdmac_resume(struct device *dev)
{
struct at_xdmac *atxdmac = dev_get_drvdata(dev);
struct at_xdmac_chan *atchan;
struct dma_chan *chan, *_chan;
struct platform_device *pdev = container_of(dev, struct platform_device, dev);
int i, ret;
ret = clk_prepare_enable(atxdmac->clk);
if (ret)
return ret;
pm_runtime_get_noresume(atxdmac->dev);
at_xdmac_axi_config(pdev);
/* Clear pending interrupts. */
for (i = 0; i < atxdmac->dma.chancnt; i++) {
atchan = &atxdmac->chan[i];
while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS))
cpu_relax();
}
at_xdmac_write(atxdmac, AT_XDMAC_GIE, atxdmac->save_gim);
list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) {
atchan = to_at_xdmac_chan(chan);
at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc);
if (at_xdmac_chan_is_cyclic(atchan)) {
/*
* Resume only channels not explicitly paused by
* consumers.
*/
if (at_xdmac_chan_is_paused_internal(atchan)) {
ret = at_xdmac_runtime_resume_descriptors(atchan);
if (ret < 0)
return ret;
at_xdmac_device_resume_internal(atchan);
}
/*
* We may resume from a deep sleep state where power
* to DMA controller is cut-off. Thus, restore the
* suspend state of channels set though dmaengine API.
*/
else if (at_xdmac_chan_is_paused(atchan))
at_xdmac_device_pause_set(atxdmac, atchan);
at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda);
at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc);
at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim);
wmb();
if (atxdmac->save_gs & atchan->mask)
at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask);
}
}
pm_runtime_mark_last_busy(atxdmac->dev);
pm_runtime_put_autosuspend(atxdmac->dev);
return 0;
}
static int __maybe_unused atmel_xdmac_runtime_suspend(struct device *dev)
{
struct at_xdmac *atxdmac = dev_get_drvdata(dev);
clk_disable(atxdmac->clk);
return 0;
}
static int __maybe_unused atmel_xdmac_runtime_resume(struct device *dev)
{
struct at_xdmac *atxdmac = dev_get_drvdata(dev);
return clk_enable(atxdmac->clk);
}
static int at_xdmac_probe(struct platform_device *pdev)
{
struct at_xdmac *atxdmac;
int irq, nr_channels, i, ret;
void __iomem *base;
u32 reg;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
/*
* Read number of xdmac channels, read helper function can't be used
* since atxdmac is not yet allocated and we need to know the number
* of channels to do the allocation.
*/
reg = readl_relaxed(base + AT_XDMAC_GTYPE);
nr_channels = AT_XDMAC_NB_CH(reg);
if (nr_channels > AT_XDMAC_MAX_CHAN) {
dev_err(&pdev->dev, "invalid number of channels (%u)\n",
nr_channels);
return -EINVAL;
}
atxdmac = devm_kzalloc(&pdev->dev,
struct_size(atxdmac, chan, nr_channels),
GFP_KERNEL);
if (!atxdmac) {
dev_err(&pdev->dev, "can't allocate at_xdmac structure\n");
return -ENOMEM;
}
atxdmac->regs = base;
atxdmac->irq = irq;
atxdmac->dev = &pdev->dev;
atxdmac->layout = of_device_get_match_data(&pdev->dev);
if (!atxdmac->layout)
return -ENODEV;
atxdmac->clk = devm_clk_get(&pdev->dev, "dma_clk");
if (IS_ERR(atxdmac->clk)) {
dev_err(&pdev->dev, "can't get dma_clk\n");
return PTR_ERR(atxdmac->clk);
}
/* Do not use dev res to prevent races with tasklet */
ret = request_irq(atxdmac->irq, at_xdmac_interrupt, 0, "at_xdmac", atxdmac);
if (ret) {
dev_err(&pdev->dev, "can't request irq\n");
return ret;
}
ret = clk_prepare_enable(atxdmac->clk);
if (ret) {
dev_err(&pdev->dev, "can't prepare or enable clock\n");
goto err_free_irq;
}
atxdmac->at_xdmac_desc_pool =
dmam_pool_create(dev_name(&pdev->dev), &pdev->dev,
sizeof(struct at_xdmac_desc), 4, 0);
if (!atxdmac->at_xdmac_desc_pool) {
dev_err(&pdev->dev, "no memory for descriptors dma pool\n");
ret = -ENOMEM;
goto err_clk_disable;
}
dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask);
dma_cap_set(DMA_INTERLEAVE, atxdmac->dma.cap_mask);
dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask);
dma_cap_set(DMA_MEMSET, atxdmac->dma.cap_mask);
dma_cap_set(DMA_MEMSET_SG, atxdmac->dma.cap_mask);
dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask);
/*
* Without DMA_PRIVATE the driver is not able to allocate more than
* one channel, second allocation fails in private_candidate.
*/
dma_cap_set(DMA_PRIVATE, atxdmac->dma.cap_mask);
atxdmac->dma.dev = &pdev->dev;
atxdmac->dma.device_alloc_chan_resources = at_xdmac_alloc_chan_resources;
atxdmac->dma.device_free_chan_resources = at_xdmac_free_chan_resources;
atxdmac->dma.device_tx_status = at_xdmac_tx_status;
atxdmac->dma.device_issue_pending = at_xdmac_issue_pending;
atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic;
atxdmac->dma.device_prep_interleaved_dma = at_xdmac_prep_interleaved;
atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy;
atxdmac->dma.device_prep_dma_memset = at_xdmac_prep_dma_memset;
atxdmac->dma.device_prep_dma_memset_sg = at_xdmac_prep_dma_memset_sg;
atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg;
atxdmac->dma.device_config = at_xdmac_device_config;
atxdmac->dma.device_pause = at_xdmac_device_pause;
atxdmac->dma.device_resume = at_xdmac_device_resume;
atxdmac->dma.device_terminate_all = at_xdmac_device_terminate_all;
atxdmac->dma.src_addr_widths = AT_XDMAC_DMA_BUSWIDTHS;
atxdmac->dma.dst_addr_widths = AT_XDMAC_DMA_BUSWIDTHS;
atxdmac->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
atxdmac->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
platform_set_drvdata(pdev, atxdmac);
pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
/* Init channels. */
INIT_LIST_HEAD(&atxdmac->dma.channels);
/* Disable all chans and interrupts. */
at_xdmac_off(atxdmac, true);
for (i = 0; i < nr_channels; i++) {
struct at_xdmac_chan *atchan = &atxdmac->chan[i];
atchan->chan.device = &atxdmac->dma;
list_add_tail(&atchan->chan.device_node,
&atxdmac->dma.channels);
atchan->ch_regs = at_xdmac_chan_reg_base(atxdmac, i);
atchan->mask = 1 << i;
spin_lock_init(&atchan->lock);
INIT_LIST_HEAD(&atchan->xfers_list);
INIT_LIST_HEAD(&atchan->free_descs_list);
tasklet_setup(&atchan->tasklet, at_xdmac_tasklet);
/* Clear pending interrupts. */
while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS))
cpu_relax();
}
ret = dma_async_device_register(&atxdmac->dma);
if (ret) {
dev_err(&pdev->dev, "fail to register DMA engine device\n");
goto err_pm_disable;
}
ret = of_dma_controller_register(pdev->dev.of_node,
at_xdmac_xlate, atxdmac);
if (ret) {
dev_err(&pdev->dev, "could not register of dma controller\n");
goto err_dma_unregister;
}
dev_info(&pdev->dev, "%d channels, mapped at 0x%p\n",
nr_channels, atxdmac->regs);
at_xdmac_axi_config(pdev);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
return 0;
err_dma_unregister:
dma_async_device_unregister(&atxdmac->dma);
err_pm_disable:
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
err_clk_disable:
clk_disable_unprepare(atxdmac->clk);
err_free_irq:
free_irq(atxdmac->irq, atxdmac);
return ret;
}
static int at_xdmac_remove(struct platform_device *pdev)
{
struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev);
int i;
at_xdmac_off(atxdmac, true);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&atxdmac->dma);
pm_runtime_disable(atxdmac->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
clk_disable_unprepare(atxdmac->clk);
free_irq(atxdmac->irq, atxdmac);
for (i = 0; i < atxdmac->dma.chancnt; i++) {
struct at_xdmac_chan *atchan = &atxdmac->chan[i];
tasklet_kill(&atchan->tasklet);
at_xdmac_free_chan_resources(&atchan->chan);
}
return 0;
}
static const struct dev_pm_ops __maybe_unused atmel_xdmac_dev_pm_ops = {
.prepare = atmel_xdmac_prepare,
SET_LATE_SYSTEM_SLEEP_PM_OPS(atmel_xdmac_suspend, atmel_xdmac_resume)
SET_RUNTIME_PM_OPS(atmel_xdmac_runtime_suspend,
atmel_xdmac_runtime_resume, NULL)
};
static const struct of_device_id atmel_xdmac_dt_ids[] = {
{
.compatible = "atmel,sama5d4-dma",
.data = &at_xdmac_sama5d4_layout,
}, {
.compatible = "microchip,sama7g5-dma",
.data = &at_xdmac_sama7g5_layout,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, atmel_xdmac_dt_ids);
static struct platform_driver at_xdmac_driver = {
.probe = at_xdmac_probe,
.remove = at_xdmac_remove,
.driver = {
.name = "at_xdmac",
.of_match_table = of_match_ptr(atmel_xdmac_dt_ids),
.pm = pm_ptr(&atmel_xdmac_dev_pm_ops),
}
};
static int __init at_xdmac_init(void)
{
return platform_driver_register(&at_xdmac_driver);
}
subsys_initcall(at_xdmac_init);
static void __exit at_xdmac_exit(void)
{
platform_driver_unregister(&at_xdmac_driver);
}
module_exit(at_xdmac_exit);
MODULE_DESCRIPTION("Atmel Extended DMA Controller driver");
MODULE_AUTHOR("Ludovic Desroches <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/at_xdmac.c |
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2019 Linaro Ltd.
// Copyright (C) 2019 Socionext Inc.
#include <linux/bits.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/bitfield.h>
#include "virt-dma.h"
/* global register */
#define M10V_XDACS 0x00
/* channel local register */
#define M10V_XDTBC 0x10
#define M10V_XDSSA 0x14
#define M10V_XDDSA 0x18
#define M10V_XDSAC 0x1C
#define M10V_XDDAC 0x20
#define M10V_XDDCC 0x24
#define M10V_XDDES 0x28
#define M10V_XDDPC 0x2C
#define M10V_XDDSD 0x30
#define M10V_XDACS_XE BIT(28)
#define M10V_DEFBS 0x3
#define M10V_DEFBL 0xf
#define M10V_XDSAC_SBS GENMASK(17, 16)
#define M10V_XDSAC_SBL GENMASK(11, 8)
#define M10V_XDDAC_DBS GENMASK(17, 16)
#define M10V_XDDAC_DBL GENMASK(11, 8)
#define M10V_XDDES_CE BIT(28)
#define M10V_XDDES_SE BIT(24)
#define M10V_XDDES_SA BIT(15)
#define M10V_XDDES_TF GENMASK(23, 20)
#define M10V_XDDES_EI BIT(1)
#define M10V_XDDES_TI BIT(0)
#define M10V_XDDSD_IS_MASK GENMASK(3, 0)
#define M10V_XDDSD_IS_NORMAL 0x8
#define MLB_XDMAC_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
struct milbeaut_xdmac_desc {
struct virt_dma_desc vd;
size_t len;
dma_addr_t src;
dma_addr_t dst;
};
struct milbeaut_xdmac_chan {
struct virt_dma_chan vc;
struct milbeaut_xdmac_desc *md;
void __iomem *reg_ch_base;
};
struct milbeaut_xdmac_device {
struct dma_device ddev;
void __iomem *reg_base;
struct milbeaut_xdmac_chan channels[];
};
static struct milbeaut_xdmac_chan *
to_milbeaut_xdmac_chan(struct virt_dma_chan *vc)
{
return container_of(vc, struct milbeaut_xdmac_chan, vc);
}
static struct milbeaut_xdmac_desc *
to_milbeaut_xdmac_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct milbeaut_xdmac_desc, vd);
}
/* mc->vc.lock must be held by caller */
static struct milbeaut_xdmac_desc *
milbeaut_xdmac_next_desc(struct milbeaut_xdmac_chan *mc)
{
struct virt_dma_desc *vd;
vd = vchan_next_desc(&mc->vc);
if (!vd) {
mc->md = NULL;
return NULL;
}
list_del(&vd->node);
mc->md = to_milbeaut_xdmac_desc(vd);
return mc->md;
}
/* mc->vc.lock must be held by caller */
static void milbeaut_chan_start(struct milbeaut_xdmac_chan *mc,
struct milbeaut_xdmac_desc *md)
{
u32 val;
/* Setup the channel */
val = md->len - 1;
writel_relaxed(val, mc->reg_ch_base + M10V_XDTBC);
val = md->src;
writel_relaxed(val, mc->reg_ch_base + M10V_XDSSA);
val = md->dst;
writel_relaxed(val, mc->reg_ch_base + M10V_XDDSA);
val = readl_relaxed(mc->reg_ch_base + M10V_XDSAC);
val &= ~(M10V_XDSAC_SBS | M10V_XDSAC_SBL);
val |= FIELD_PREP(M10V_XDSAC_SBS, M10V_DEFBS) |
FIELD_PREP(M10V_XDSAC_SBL, M10V_DEFBL);
writel_relaxed(val, mc->reg_ch_base + M10V_XDSAC);
val = readl_relaxed(mc->reg_ch_base + M10V_XDDAC);
val &= ~(M10V_XDDAC_DBS | M10V_XDDAC_DBL);
val |= FIELD_PREP(M10V_XDDAC_DBS, M10V_DEFBS) |
FIELD_PREP(M10V_XDDAC_DBL, M10V_DEFBL);
writel_relaxed(val, mc->reg_ch_base + M10V_XDDAC);
/* Start the channel */
val = readl_relaxed(mc->reg_ch_base + M10V_XDDES);
val &= ~(M10V_XDDES_CE | M10V_XDDES_SE | M10V_XDDES_TF |
M10V_XDDES_EI | M10V_XDDES_TI);
val |= FIELD_PREP(M10V_XDDES_CE, 1) | FIELD_PREP(M10V_XDDES_SE, 1) |
FIELD_PREP(M10V_XDDES_TF, 1) | FIELD_PREP(M10V_XDDES_EI, 1) |
FIELD_PREP(M10V_XDDES_TI, 1);
writel_relaxed(val, mc->reg_ch_base + M10V_XDDES);
}
/* mc->vc.lock must be held by caller */
static void milbeaut_xdmac_start(struct milbeaut_xdmac_chan *mc)
{
struct milbeaut_xdmac_desc *md;
md = milbeaut_xdmac_next_desc(mc);
if (md)
milbeaut_chan_start(mc, md);
}
static irqreturn_t milbeaut_xdmac_interrupt(int irq, void *dev_id)
{
struct milbeaut_xdmac_chan *mc = dev_id;
struct milbeaut_xdmac_desc *md;
u32 val;
spin_lock(&mc->vc.lock);
/* Ack and Stop */
val = FIELD_PREP(M10V_XDDSD_IS_MASK, 0x0);
writel_relaxed(val, mc->reg_ch_base + M10V_XDDSD);
md = mc->md;
if (!md)
goto out;
vchan_cookie_complete(&md->vd);
milbeaut_xdmac_start(mc);
out:
spin_unlock(&mc->vc.lock);
return IRQ_HANDLED;
}
static void milbeaut_xdmac_free_chan_resources(struct dma_chan *chan)
{
vchan_free_chan_resources(to_virt_chan(chan));
}
static struct dma_async_tx_descriptor *
milbeaut_xdmac_prep_memcpy(struct dma_chan *chan, dma_addr_t dst,
dma_addr_t src, size_t len, unsigned long flags)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct milbeaut_xdmac_desc *md;
md = kzalloc(sizeof(*md), GFP_NOWAIT);
if (!md)
return NULL;
md->len = len;
md->src = src;
md->dst = dst;
return vchan_tx_prep(vc, &md->vd, flags);
}
static int milbeaut_xdmac_terminate_all(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct milbeaut_xdmac_chan *mc = to_milbeaut_xdmac_chan(vc);
unsigned long flags;
u32 val;
LIST_HEAD(head);
spin_lock_irqsave(&vc->lock, flags);
/* Halt the channel */
val = readl(mc->reg_ch_base + M10V_XDDES);
val &= ~M10V_XDDES_CE;
val |= FIELD_PREP(M10V_XDDES_CE, 0);
writel(val, mc->reg_ch_base + M10V_XDDES);
if (mc->md) {
vchan_terminate_vdesc(&mc->md->vd);
mc->md = NULL;
}
vchan_get_all_descriptors(vc, &head);
spin_unlock_irqrestore(&vc->lock, flags);
vchan_dma_desc_free_list(vc, &head);
return 0;
}
static void milbeaut_xdmac_synchronize(struct dma_chan *chan)
{
vchan_synchronize(to_virt_chan(chan));
}
static void milbeaut_xdmac_issue_pending(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct milbeaut_xdmac_chan *mc = to_milbeaut_xdmac_chan(vc);
unsigned long flags;
spin_lock_irqsave(&vc->lock, flags);
if (vchan_issue_pending(vc) && !mc->md)
milbeaut_xdmac_start(mc);
spin_unlock_irqrestore(&vc->lock, flags);
}
static void milbeaut_xdmac_desc_free(struct virt_dma_desc *vd)
{
kfree(to_milbeaut_xdmac_desc(vd));
}
static int milbeaut_xdmac_chan_init(struct platform_device *pdev,
struct milbeaut_xdmac_device *mdev,
int chan_id)
{
struct device *dev = &pdev->dev;
struct milbeaut_xdmac_chan *mc = &mdev->channels[chan_id];
char *irq_name;
int irq, ret;
irq = platform_get_irq(pdev, chan_id);
if (irq < 0)
return irq;
irq_name = devm_kasprintf(dev, GFP_KERNEL, "milbeaut-xdmac-%d",
chan_id);
if (!irq_name)
return -ENOMEM;
ret = devm_request_irq(dev, irq, milbeaut_xdmac_interrupt,
IRQF_SHARED, irq_name, mc);
if (ret)
return ret;
mc->reg_ch_base = mdev->reg_base + chan_id * 0x30;
mc->vc.desc_free = milbeaut_xdmac_desc_free;
vchan_init(&mc->vc, &mdev->ddev);
return 0;
}
static void enable_xdmac(struct milbeaut_xdmac_device *mdev)
{
unsigned int val;
val = readl(mdev->reg_base + M10V_XDACS);
val |= M10V_XDACS_XE;
writel(val, mdev->reg_base + M10V_XDACS);
}
static void disable_xdmac(struct milbeaut_xdmac_device *mdev)
{
unsigned int val;
val = readl(mdev->reg_base + M10V_XDACS);
val &= ~M10V_XDACS_XE;
writel(val, mdev->reg_base + M10V_XDACS);
}
static int milbeaut_xdmac_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct milbeaut_xdmac_device *mdev;
struct dma_device *ddev;
int nr_chans, ret, i;
nr_chans = platform_irq_count(pdev);
if (nr_chans < 0)
return nr_chans;
mdev = devm_kzalloc(dev, struct_size(mdev, channels, nr_chans),
GFP_KERNEL);
if (!mdev)
return -ENOMEM;
mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mdev->reg_base))
return PTR_ERR(mdev->reg_base);
ddev = &mdev->ddev;
ddev->dev = dev;
dma_cap_set(DMA_MEMCPY, ddev->cap_mask);
ddev->src_addr_widths = MLB_XDMAC_BUSWIDTHS;
ddev->dst_addr_widths = MLB_XDMAC_BUSWIDTHS;
ddev->device_free_chan_resources = milbeaut_xdmac_free_chan_resources;
ddev->device_prep_dma_memcpy = milbeaut_xdmac_prep_memcpy;
ddev->device_terminate_all = milbeaut_xdmac_terminate_all;
ddev->device_synchronize = milbeaut_xdmac_synchronize;
ddev->device_tx_status = dma_cookie_status;
ddev->device_issue_pending = milbeaut_xdmac_issue_pending;
INIT_LIST_HEAD(&ddev->channels);
for (i = 0; i < nr_chans; i++) {
ret = milbeaut_xdmac_chan_init(pdev, mdev, i);
if (ret)
return ret;
}
enable_xdmac(mdev);
ret = dma_async_device_register(ddev);
if (ret)
goto disable_xdmac;
ret = of_dma_controller_register(dev->of_node,
of_dma_simple_xlate, mdev);
if (ret)
goto unregister_dmac;
platform_set_drvdata(pdev, mdev);
return 0;
unregister_dmac:
dma_async_device_unregister(ddev);
disable_xdmac:
disable_xdmac(mdev);
return ret;
}
static int milbeaut_xdmac_remove(struct platform_device *pdev)
{
struct milbeaut_xdmac_device *mdev = platform_get_drvdata(pdev);
struct dma_chan *chan;
int ret;
/*
* Before reaching here, almost all descriptors have been freed by the
* ->device_free_chan_resources() hook. However, each channel might
* be still holding one descriptor that was on-flight at that moment.
* Terminate it to make sure this hardware is no longer running. Then,
* free the channel resources once again to avoid memory leak.
*/
list_for_each_entry(chan, &mdev->ddev.channels, device_node) {
ret = dmaengine_terminate_sync(chan);
if (ret)
return ret;
milbeaut_xdmac_free_chan_resources(chan);
}
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&mdev->ddev);
disable_xdmac(mdev);
return 0;
}
static const struct of_device_id milbeaut_xdmac_match[] = {
{ .compatible = "socionext,milbeaut-m10v-xdmac" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, milbeaut_xdmac_match);
static struct platform_driver milbeaut_xdmac_driver = {
.probe = milbeaut_xdmac_probe,
.remove = milbeaut_xdmac_remove,
.driver = {
.name = "milbeaut-m10v-xdmac",
.of_match_table = milbeaut_xdmac_match,
},
};
module_platform_driver(milbeaut_xdmac_driver);
MODULE_DESCRIPTION("Milbeaut XDMAC DmaEngine driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/milbeaut-xdmac.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Applied Micro X-Gene SoC DMA engine Driver
*
* Copyright (c) 2015, Applied Micro Circuits Corporation
* Authors: Rameshwar Prasad Sahu <[email protected]>
* Loc Ho <[email protected]>
*
* NOTE: PM support is currently not available.
*/
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include "dmaengine.h"
/* X-Gene DMA ring csr registers and bit definations */
#define XGENE_DMA_RING_CONFIG 0x04
#define XGENE_DMA_RING_ENABLE BIT(31)
#define XGENE_DMA_RING_ID 0x08
#define XGENE_DMA_RING_ID_SETUP(v) ((v) | BIT(31))
#define XGENE_DMA_RING_ID_BUF 0x0C
#define XGENE_DMA_RING_ID_BUF_SETUP(v) (((v) << 9) | BIT(21))
#define XGENE_DMA_RING_THRESLD0_SET1 0x30
#define XGENE_DMA_RING_THRESLD0_SET1_VAL 0X64
#define XGENE_DMA_RING_THRESLD1_SET1 0x34
#define XGENE_DMA_RING_THRESLD1_SET1_VAL 0xC8
#define XGENE_DMA_RING_HYSTERESIS 0x68
#define XGENE_DMA_RING_HYSTERESIS_VAL 0xFFFFFFFF
#define XGENE_DMA_RING_STATE 0x6C
#define XGENE_DMA_RING_STATE_WR_BASE 0x70
#define XGENE_DMA_RING_NE_INT_MODE 0x017C
#define XGENE_DMA_RING_NE_INT_MODE_SET(m, v) \
((m) = ((m) & ~BIT(31 - (v))) | BIT(31 - (v)))
#define XGENE_DMA_RING_NE_INT_MODE_RESET(m, v) \
((m) &= (~BIT(31 - (v))))
#define XGENE_DMA_RING_CLKEN 0xC208
#define XGENE_DMA_RING_SRST 0xC200
#define XGENE_DMA_RING_MEM_RAM_SHUTDOWN 0xD070
#define XGENE_DMA_RING_BLK_MEM_RDY 0xD074
#define XGENE_DMA_RING_BLK_MEM_RDY_VAL 0xFFFFFFFF
#define XGENE_DMA_RING_ID_GET(owner, num) (((owner) << 6) | (num))
#define XGENE_DMA_RING_DST_ID(v) ((1 << 10) | (v))
#define XGENE_DMA_RING_CMD_OFFSET 0x2C
#define XGENE_DMA_RING_CMD_BASE_OFFSET(v) ((v) << 6)
#define XGENE_DMA_RING_COHERENT_SET(m) \
(((u32 *)(m))[2] |= BIT(4))
#define XGENE_DMA_RING_ADDRL_SET(m, v) \
(((u32 *)(m))[2] |= (((v) >> 8) << 5))
#define XGENE_DMA_RING_ADDRH_SET(m, v) \
(((u32 *)(m))[3] |= ((v) >> 35))
#define XGENE_DMA_RING_ACCEPTLERR_SET(m) \
(((u32 *)(m))[3] |= BIT(19))
#define XGENE_DMA_RING_SIZE_SET(m, v) \
(((u32 *)(m))[3] |= ((v) << 23))
#define XGENE_DMA_RING_RECOMBBUF_SET(m) \
(((u32 *)(m))[3] |= BIT(27))
#define XGENE_DMA_RING_RECOMTIMEOUTL_SET(m) \
(((u32 *)(m))[3] |= (0x7 << 28))
#define XGENE_DMA_RING_RECOMTIMEOUTH_SET(m) \
(((u32 *)(m))[4] |= 0x3)
#define XGENE_DMA_RING_SELTHRSH_SET(m) \
(((u32 *)(m))[4] |= BIT(3))
#define XGENE_DMA_RING_TYPE_SET(m, v) \
(((u32 *)(m))[4] |= ((v) << 19))
/* X-Gene DMA device csr registers and bit definitions */
#define XGENE_DMA_IPBRR 0x0
#define XGENE_DMA_DEV_ID_RD(v) ((v) & 0x00000FFF)
#define XGENE_DMA_BUS_ID_RD(v) (((v) >> 12) & 3)
#define XGENE_DMA_REV_NO_RD(v) (((v) >> 14) & 3)
#define XGENE_DMA_GCR 0x10
#define XGENE_DMA_CH_SETUP(v) \
((v) = ((v) & ~0x000FFFFF) | 0x000AAFFF)
#define XGENE_DMA_ENABLE(v) ((v) |= BIT(31))
#define XGENE_DMA_DISABLE(v) ((v) &= ~BIT(31))
#define XGENE_DMA_RAID6_CONT 0x14
#define XGENE_DMA_RAID6_MULTI_CTRL(v) ((v) << 24)
#define XGENE_DMA_INT 0x70
#define XGENE_DMA_INT_MASK 0x74
#define XGENE_DMA_INT_ALL_MASK 0xFFFFFFFF
#define XGENE_DMA_INT_ALL_UNMASK 0x0
#define XGENE_DMA_INT_MASK_SHIFT 0x14
#define XGENE_DMA_RING_INT0_MASK 0x90A0
#define XGENE_DMA_RING_INT1_MASK 0x90A8
#define XGENE_DMA_RING_INT2_MASK 0x90B0
#define XGENE_DMA_RING_INT3_MASK 0x90B8
#define XGENE_DMA_RING_INT4_MASK 0x90C0
#define XGENE_DMA_CFG_RING_WQ_ASSOC 0x90E0
#define XGENE_DMA_ASSOC_RING_MNGR1 0xFFFFFFFF
#define XGENE_DMA_MEM_RAM_SHUTDOWN 0xD070
#define XGENE_DMA_BLK_MEM_RDY 0xD074
#define XGENE_DMA_BLK_MEM_RDY_VAL 0xFFFFFFFF
#define XGENE_DMA_RING_CMD_SM_OFFSET 0x8000
/* X-Gene SoC EFUSE csr register and bit defination */
#define XGENE_SOC_JTAG1_SHADOW 0x18
#define XGENE_DMA_PQ_DISABLE_MASK BIT(13)
/* X-Gene DMA Descriptor format */
#define XGENE_DMA_DESC_NV_BIT BIT_ULL(50)
#define XGENE_DMA_DESC_IN_BIT BIT_ULL(55)
#define XGENE_DMA_DESC_C_BIT BIT_ULL(63)
#define XGENE_DMA_DESC_DR_BIT BIT_ULL(61)
#define XGENE_DMA_DESC_ELERR_POS 46
#define XGENE_DMA_DESC_RTYPE_POS 56
#define XGENE_DMA_DESC_LERR_POS 60
#define XGENE_DMA_DESC_BUFLEN_POS 48
#define XGENE_DMA_DESC_HOENQ_NUM_POS 48
#define XGENE_DMA_DESC_ELERR_RD(m) \
(((m) >> XGENE_DMA_DESC_ELERR_POS) & 0x3)
#define XGENE_DMA_DESC_LERR_RD(m) \
(((m) >> XGENE_DMA_DESC_LERR_POS) & 0x7)
#define XGENE_DMA_DESC_STATUS(elerr, lerr) \
(((elerr) << 4) | (lerr))
/* X-Gene DMA descriptor empty s/w signature */
#define XGENE_DMA_DESC_EMPTY_SIGNATURE ~0ULL
/* X-Gene DMA configurable parameters defines */
#define XGENE_DMA_RING_NUM 512
#define XGENE_DMA_BUFNUM 0x0
#define XGENE_DMA_CPU_BUFNUM 0x18
#define XGENE_DMA_RING_OWNER_DMA 0x03
#define XGENE_DMA_RING_OWNER_CPU 0x0F
#define XGENE_DMA_RING_TYPE_REGULAR 0x01
#define XGENE_DMA_RING_WQ_DESC_SIZE 32 /* 32 Bytes */
#define XGENE_DMA_RING_NUM_CONFIG 5
#define XGENE_DMA_MAX_CHANNEL 4
#define XGENE_DMA_XOR_CHANNEL 0
#define XGENE_DMA_PQ_CHANNEL 1
#define XGENE_DMA_MAX_BYTE_CNT 0x4000 /* 16 KB */
#define XGENE_DMA_MAX_64B_DESC_BYTE_CNT 0x14000 /* 80 KB */
#define XGENE_DMA_MAX_XOR_SRC 5
#define XGENE_DMA_16K_BUFFER_LEN_CODE 0x0
#define XGENE_DMA_INVALID_LEN_CODE 0x7800000000000000ULL
/* X-Gene DMA descriptor error codes */
#define ERR_DESC_AXI 0x01
#define ERR_BAD_DESC 0x02
#define ERR_READ_DATA_AXI 0x03
#define ERR_WRITE_DATA_AXI 0x04
#define ERR_FBP_TIMEOUT 0x05
#define ERR_ECC 0x06
#define ERR_DIFF_SIZE 0x08
#define ERR_SCT_GAT_LEN 0x09
#define ERR_CRC_ERR 0x11
#define ERR_CHKSUM 0x12
#define ERR_DIF 0x13
/* X-Gene DMA error interrupt codes */
#define ERR_DIF_SIZE_INT 0x0
#define ERR_GS_ERR_INT 0x1
#define ERR_FPB_TIMEO_INT 0x2
#define ERR_WFIFO_OVF_INT 0x3
#define ERR_RFIFO_OVF_INT 0x4
#define ERR_WR_TIMEO_INT 0x5
#define ERR_RD_TIMEO_INT 0x6
#define ERR_WR_ERR_INT 0x7
#define ERR_RD_ERR_INT 0x8
#define ERR_BAD_DESC_INT 0x9
#define ERR_DESC_DST_INT 0xA
#define ERR_DESC_SRC_INT 0xB
/* X-Gene DMA flyby operation code */
#define FLYBY_2SRC_XOR 0x80
#define FLYBY_3SRC_XOR 0x90
#define FLYBY_4SRC_XOR 0xA0
#define FLYBY_5SRC_XOR 0xB0
/* X-Gene DMA SW descriptor flags */
#define XGENE_DMA_FLAG_64B_DESC BIT(0)
/* Define to dump X-Gene DMA descriptor */
#define XGENE_DMA_DESC_DUMP(desc, m) \
print_hex_dump(KERN_ERR, (m), \
DUMP_PREFIX_ADDRESS, 16, 8, (desc), 32, 0)
#define to_dma_desc_sw(tx) \
container_of(tx, struct xgene_dma_desc_sw, tx)
#define to_dma_chan(dchan) \
container_of(dchan, struct xgene_dma_chan, dma_chan)
#define chan_dbg(chan, fmt, arg...) \
dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg)
#define chan_err(chan, fmt, arg...) \
dev_err(chan->dev, "%s: " fmt, chan->name, ##arg)
struct xgene_dma_desc_hw {
__le64 m0;
__le64 m1;
__le64 m2;
__le64 m3;
};
enum xgene_dma_ring_cfgsize {
XGENE_DMA_RING_CFG_SIZE_512B,
XGENE_DMA_RING_CFG_SIZE_2KB,
XGENE_DMA_RING_CFG_SIZE_16KB,
XGENE_DMA_RING_CFG_SIZE_64KB,
XGENE_DMA_RING_CFG_SIZE_512KB,
XGENE_DMA_RING_CFG_SIZE_INVALID
};
struct xgene_dma_ring {
struct xgene_dma *pdma;
u8 buf_num;
u16 id;
u16 num;
u16 head;
u16 owner;
u16 slots;
u16 dst_ring_num;
u32 size;
void __iomem *cmd;
void __iomem *cmd_base;
dma_addr_t desc_paddr;
u32 state[XGENE_DMA_RING_NUM_CONFIG];
enum xgene_dma_ring_cfgsize cfgsize;
union {
void *desc_vaddr;
struct xgene_dma_desc_hw *desc_hw;
};
};
struct xgene_dma_desc_sw {
struct xgene_dma_desc_hw desc1;
struct xgene_dma_desc_hw desc2;
u32 flags;
struct list_head node;
struct list_head tx_list;
struct dma_async_tx_descriptor tx;
};
/**
* struct xgene_dma_chan - internal representation of an X-Gene DMA channel
* @dma_chan: dmaengine channel object member
* @pdma: X-Gene DMA device structure reference
* @dev: struct device reference for dma mapping api
* @id: raw id of this channel
* @rx_irq: channel IRQ
* @name: name of X-Gene DMA channel
* @lock: serializes enqueue/dequeue operations to the descriptor pool
* @pending: number of transaction request pushed to DMA controller for
* execution, but still waiting for completion,
* @max_outstanding: max number of outstanding request we can push to channel
* @ld_pending: descriptors which are queued to run, but have not yet been
* submitted to the hardware for execution
* @ld_running: descriptors which are currently being executing by the hardware
* @ld_completed: descriptors which have finished execution by the hardware.
* These descriptors have already had their cleanup actions run. They
* are waiting for the ACK bit to be set by the async tx API.
* @desc_pool: descriptor pool for DMA operations
* @tasklet: bottom half where all completed descriptors cleans
* @tx_ring: transmit ring descriptor that we use to prepare actual
* descriptors for further executions
* @rx_ring: receive ring descriptor that we use to get completed DMA
* descriptors during cleanup time
*/
struct xgene_dma_chan {
struct dma_chan dma_chan;
struct xgene_dma *pdma;
struct device *dev;
int id;
int rx_irq;
char name[10];
spinlock_t lock;
int pending;
int max_outstanding;
struct list_head ld_pending;
struct list_head ld_running;
struct list_head ld_completed;
struct dma_pool *desc_pool;
struct tasklet_struct tasklet;
struct xgene_dma_ring tx_ring;
struct xgene_dma_ring rx_ring;
};
/**
* struct xgene_dma - internal representation of an X-Gene DMA device
* @dev: reference to this device's struct device
* @clk: reference to this device's clock
* @err_irq: DMA error irq number
* @ring_num: start id number for DMA ring
* @csr_dma: base for DMA register access
* @csr_ring: base for DMA ring register access
* @csr_ring_cmd: base for DMA ring command register access
* @csr_efuse: base for efuse register access
* @dma_dev: embedded struct dma_device
* @chan: reference to X-Gene DMA channels
*/
struct xgene_dma {
struct device *dev;
struct clk *clk;
int err_irq;
int ring_num;
void __iomem *csr_dma;
void __iomem *csr_ring;
void __iomem *csr_ring_cmd;
void __iomem *csr_efuse;
struct dma_device dma_dev[XGENE_DMA_MAX_CHANNEL];
struct xgene_dma_chan chan[XGENE_DMA_MAX_CHANNEL];
};
static const char * const xgene_dma_desc_err[] = {
[ERR_DESC_AXI] = "AXI error when reading src/dst link list",
[ERR_BAD_DESC] = "ERR or El_ERR fields not set to zero in desc",
[ERR_READ_DATA_AXI] = "AXI error when reading data",
[ERR_WRITE_DATA_AXI] = "AXI error when writing data",
[ERR_FBP_TIMEOUT] = "Timeout on bufpool fetch",
[ERR_ECC] = "ECC double bit error",
[ERR_DIFF_SIZE] = "Bufpool too small to hold all the DIF result",
[ERR_SCT_GAT_LEN] = "Gather and scatter data length not same",
[ERR_CRC_ERR] = "CRC error",
[ERR_CHKSUM] = "Checksum error",
[ERR_DIF] = "DIF error",
};
static const char * const xgene_dma_err[] = {
[ERR_DIF_SIZE_INT] = "DIF size error",
[ERR_GS_ERR_INT] = "Gather scatter not same size error",
[ERR_FPB_TIMEO_INT] = "Free pool time out error",
[ERR_WFIFO_OVF_INT] = "Write FIFO over flow error",
[ERR_RFIFO_OVF_INT] = "Read FIFO over flow error",
[ERR_WR_TIMEO_INT] = "Write time out error",
[ERR_RD_TIMEO_INT] = "Read time out error",
[ERR_WR_ERR_INT] = "HBF bus write error",
[ERR_RD_ERR_INT] = "HBF bus read error",
[ERR_BAD_DESC_INT] = "Ring descriptor HE0 not set error",
[ERR_DESC_DST_INT] = "HFB reading dst link address error",
[ERR_DESC_SRC_INT] = "HFB reading src link address error",
};
static bool is_pq_enabled(struct xgene_dma *pdma)
{
u32 val;
val = ioread32(pdma->csr_efuse + XGENE_SOC_JTAG1_SHADOW);
return !(val & XGENE_DMA_PQ_DISABLE_MASK);
}
static u64 xgene_dma_encode_len(size_t len)
{
return (len < XGENE_DMA_MAX_BYTE_CNT) ?
((u64)len << XGENE_DMA_DESC_BUFLEN_POS) :
XGENE_DMA_16K_BUFFER_LEN_CODE;
}
static u8 xgene_dma_encode_xor_flyby(u32 src_cnt)
{
static u8 flyby_type[] = {
FLYBY_2SRC_XOR, /* Dummy */
FLYBY_2SRC_XOR, /* Dummy */
FLYBY_2SRC_XOR,
FLYBY_3SRC_XOR,
FLYBY_4SRC_XOR,
FLYBY_5SRC_XOR
};
return flyby_type[src_cnt];
}
static void xgene_dma_set_src_buffer(__le64 *ext8, size_t *len,
dma_addr_t *paddr)
{
size_t nbytes = (*len < XGENE_DMA_MAX_BYTE_CNT) ?
*len : XGENE_DMA_MAX_BYTE_CNT;
*ext8 |= cpu_to_le64(*paddr);
*ext8 |= cpu_to_le64(xgene_dma_encode_len(nbytes));
*len -= nbytes;
*paddr += nbytes;
}
static __le64 *xgene_dma_lookup_ext8(struct xgene_dma_desc_hw *desc, int idx)
{
switch (idx) {
case 0:
return &desc->m1;
case 1:
return &desc->m0;
case 2:
return &desc->m3;
case 3:
return &desc->m2;
default:
pr_err("Invalid dma descriptor index\n");
}
return NULL;
}
static void xgene_dma_init_desc(struct xgene_dma_desc_hw *desc,
u16 dst_ring_num)
{
desc->m0 |= cpu_to_le64(XGENE_DMA_DESC_IN_BIT);
desc->m0 |= cpu_to_le64((u64)XGENE_DMA_RING_OWNER_DMA <<
XGENE_DMA_DESC_RTYPE_POS);
desc->m1 |= cpu_to_le64(XGENE_DMA_DESC_C_BIT);
desc->m3 |= cpu_to_le64((u64)dst_ring_num <<
XGENE_DMA_DESC_HOENQ_NUM_POS);
}
static void xgene_dma_prep_xor_desc(struct xgene_dma_chan *chan,
struct xgene_dma_desc_sw *desc_sw,
dma_addr_t *dst, dma_addr_t *src,
u32 src_cnt, size_t *nbytes,
const u8 *scf)
{
struct xgene_dma_desc_hw *desc1, *desc2;
size_t len = *nbytes;
int i;
desc1 = &desc_sw->desc1;
desc2 = &desc_sw->desc2;
/* Initialize DMA descriptor */
xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num);
/* Set destination address */
desc1->m2 |= cpu_to_le64(XGENE_DMA_DESC_DR_BIT);
desc1->m3 |= cpu_to_le64(*dst);
/* We have multiple source addresses, so need to set NV bit*/
desc1->m0 |= cpu_to_le64(XGENE_DMA_DESC_NV_BIT);
/* Set flyby opcode */
desc1->m2 |= cpu_to_le64(xgene_dma_encode_xor_flyby(src_cnt));
/* Set 1st to 5th source addresses */
for (i = 0; i < src_cnt; i++) {
len = *nbytes;
xgene_dma_set_src_buffer((i == 0) ? &desc1->m1 :
xgene_dma_lookup_ext8(desc2, i - 1),
&len, &src[i]);
desc1->m2 |= cpu_to_le64((scf[i] << ((i + 1) * 8)));
}
/* Update meta data */
*nbytes = len;
*dst += XGENE_DMA_MAX_BYTE_CNT;
/* We need always 64B descriptor to perform xor or pq operations */
desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC;
}
static dma_cookie_t xgene_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct xgene_dma_desc_sw *desc;
struct xgene_dma_chan *chan;
dma_cookie_t cookie;
if (unlikely(!tx))
return -EINVAL;
chan = to_dma_chan(tx->chan);
desc = to_dma_desc_sw(tx);
spin_lock_bh(&chan->lock);
cookie = dma_cookie_assign(tx);
/* Add this transaction list onto the tail of the pending queue */
list_splice_tail_init(&desc->tx_list, &chan->ld_pending);
spin_unlock_bh(&chan->lock);
return cookie;
}
static void xgene_dma_clean_descriptor(struct xgene_dma_chan *chan,
struct xgene_dma_desc_sw *desc)
{
list_del(&desc->node);
chan_dbg(chan, "LD %p free\n", desc);
dma_pool_free(chan->desc_pool, desc, desc->tx.phys);
}
static struct xgene_dma_desc_sw *xgene_dma_alloc_descriptor(
struct xgene_dma_chan *chan)
{
struct xgene_dma_desc_sw *desc;
dma_addr_t phys;
desc = dma_pool_zalloc(chan->desc_pool, GFP_NOWAIT, &phys);
if (!desc) {
chan_err(chan, "Failed to allocate LDs\n");
return NULL;
}
INIT_LIST_HEAD(&desc->tx_list);
desc->tx.phys = phys;
desc->tx.tx_submit = xgene_dma_tx_submit;
dma_async_tx_descriptor_init(&desc->tx, &chan->dma_chan);
chan_dbg(chan, "LD %p allocated\n", desc);
return desc;
}
/**
* xgene_dma_clean_completed_descriptor - free all descriptors which
* has been completed and acked
* @chan: X-Gene DMA channel
*
* This function is used on all completed and acked descriptors.
*/
static void xgene_dma_clean_completed_descriptor(struct xgene_dma_chan *chan)
{
struct xgene_dma_desc_sw *desc, *_desc;
/* Run the callback for each descriptor, in order */
list_for_each_entry_safe(desc, _desc, &chan->ld_completed, node) {
if (async_tx_test_ack(&desc->tx))
xgene_dma_clean_descriptor(chan, desc);
}
}
/**
* xgene_dma_run_tx_complete_actions - cleanup a single link descriptor
* @chan: X-Gene DMA channel
* @desc: descriptor to cleanup and free
*
* This function is used on a descriptor which has been executed by the DMA
* controller. It will run any callbacks, submit any dependencies.
*/
static void xgene_dma_run_tx_complete_actions(struct xgene_dma_chan *chan,
struct xgene_dma_desc_sw *desc)
{
struct dma_async_tx_descriptor *tx = &desc->tx;
/*
* If this is not the last transaction in the group,
* then no need to complete cookie and run any callback as
* this is not the tx_descriptor which had been sent to caller
* of this DMA request
*/
if (tx->cookie == 0)
return;
dma_cookie_complete(tx);
dma_descriptor_unmap(tx);
/* Run the link descriptor callback function */
dmaengine_desc_get_callback_invoke(tx, NULL);
/* Run any dependencies */
dma_run_dependencies(tx);
}
/**
* xgene_dma_clean_running_descriptor - move the completed descriptor from
* ld_running to ld_completed
* @chan: X-Gene DMA channel
* @desc: the descriptor which is completed
*
* Free the descriptor directly if acked by async_tx api,
* else move it to queue ld_completed.
*/
static void xgene_dma_clean_running_descriptor(struct xgene_dma_chan *chan,
struct xgene_dma_desc_sw *desc)
{
/* Remove from the list of running transactions */
list_del(&desc->node);
/*
* the client is allowed to attach dependent operations
* until 'ack' is set
*/
if (!async_tx_test_ack(&desc->tx)) {
/*
* Move this descriptor to the list of descriptors which is
* completed, but still awaiting the 'ack' bit to be set.
*/
list_add_tail(&desc->node, &chan->ld_completed);
return;
}
chan_dbg(chan, "LD %p free\n", desc);
dma_pool_free(chan->desc_pool, desc, desc->tx.phys);
}
static void xgene_chan_xfer_request(struct xgene_dma_chan *chan,
struct xgene_dma_desc_sw *desc_sw)
{
struct xgene_dma_ring *ring = &chan->tx_ring;
struct xgene_dma_desc_hw *desc_hw;
/* Get hw descriptor from DMA tx ring */
desc_hw = &ring->desc_hw[ring->head];
/*
* Increment the head count to point next
* descriptor for next time
*/
if (++ring->head == ring->slots)
ring->head = 0;
/* Copy prepared sw descriptor data to hw descriptor */
memcpy(desc_hw, &desc_sw->desc1, sizeof(*desc_hw));
/*
* Check if we have prepared 64B descriptor,
* in this case we need one more hw descriptor
*/
if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) {
desc_hw = &ring->desc_hw[ring->head];
if (++ring->head == ring->slots)
ring->head = 0;
memcpy(desc_hw, &desc_sw->desc2, sizeof(*desc_hw));
}
/* Increment the pending transaction count */
chan->pending += ((desc_sw->flags &
XGENE_DMA_FLAG_64B_DESC) ? 2 : 1);
/* Notify the hw that we have descriptor ready for execution */
iowrite32((desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) ?
2 : 1, ring->cmd);
}
/**
* xgene_chan_xfer_ld_pending - push any pending transactions to hw
* @chan : X-Gene DMA channel
*
* LOCKING: must hold chan->lock
*/
static void xgene_chan_xfer_ld_pending(struct xgene_dma_chan *chan)
{
struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
/*
* If the list of pending descriptors is empty, then we
* don't need to do any work at all
*/
if (list_empty(&chan->ld_pending)) {
chan_dbg(chan, "No pending LDs\n");
return;
}
/*
* Move elements from the queue of pending transactions onto the list
* of running transactions and push it to hw for further executions
*/
list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_pending, node) {
/*
* Check if have pushed max number of transactions to hw
* as capable, so let's stop here and will push remaining
* elements from pening ld queue after completing some
* descriptors that we have already pushed
*/
if (chan->pending >= chan->max_outstanding)
return;
xgene_chan_xfer_request(chan, desc_sw);
/*
* Delete this element from ld pending queue and append it to
* ld running queue
*/
list_move_tail(&desc_sw->node, &chan->ld_running);
}
}
/**
* xgene_dma_cleanup_descriptors - cleanup link descriptors which are completed
* and move them to ld_completed to free until flag 'ack' is set
* @chan: X-Gene DMA channel
*
* This function is used on descriptors which have been executed by the DMA
* controller. It will run any callbacks, submit any dependencies, then
* free these descriptors if flag 'ack' is set.
*/
static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
{
struct xgene_dma_ring *ring = &chan->rx_ring;
struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
struct xgene_dma_desc_hw *desc_hw;
struct list_head ld_completed;
u8 status;
INIT_LIST_HEAD(&ld_completed);
spin_lock(&chan->lock);
/* Clean already completed and acked descriptors */
xgene_dma_clean_completed_descriptor(chan);
/* Move all completed descriptors to ld completed queue, in order */
list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) {
/* Get subsequent hw descriptor from DMA rx ring */
desc_hw = &ring->desc_hw[ring->head];
/* Check if this descriptor has been completed */
if (unlikely(le64_to_cpu(desc_hw->m0) ==
XGENE_DMA_DESC_EMPTY_SIGNATURE))
break;
if (++ring->head == ring->slots)
ring->head = 0;
/* Check if we have any error with DMA transactions */
status = XGENE_DMA_DESC_STATUS(
XGENE_DMA_DESC_ELERR_RD(le64_to_cpu(
desc_hw->m0)),
XGENE_DMA_DESC_LERR_RD(le64_to_cpu(
desc_hw->m0)));
if (status) {
/* Print the DMA error type */
chan_err(chan, "%s\n", xgene_dma_desc_err[status]);
/*
* We have DMA transactions error here. Dump DMA Tx
* and Rx descriptors for this request */
XGENE_DMA_DESC_DUMP(&desc_sw->desc1,
"X-Gene DMA TX DESC1: ");
if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC)
XGENE_DMA_DESC_DUMP(&desc_sw->desc2,
"X-Gene DMA TX DESC2: ");
XGENE_DMA_DESC_DUMP(desc_hw,
"X-Gene DMA RX ERR DESC: ");
}
/* Notify the hw about this completed descriptor */
iowrite32(-1, ring->cmd);
/* Mark this hw descriptor as processed */
desc_hw->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
/*
* Decrement the pending transaction count
* as we have processed one
*/
chan->pending -= ((desc_sw->flags &
XGENE_DMA_FLAG_64B_DESC) ? 2 : 1);
/*
* Delete this node from ld running queue and append it to
* ld completed queue for further processing
*/
list_move_tail(&desc_sw->node, &ld_completed);
}
/*
* Start any pending transactions automatically
* In the ideal case, we keep the DMA controller busy while we go
* ahead and free the descriptors below.
*/
xgene_chan_xfer_ld_pending(chan);
spin_unlock(&chan->lock);
/* Run the callback for each descriptor, in order */
list_for_each_entry_safe(desc_sw, _desc_sw, &ld_completed, node) {
xgene_dma_run_tx_complete_actions(chan, desc_sw);
xgene_dma_clean_running_descriptor(chan, desc_sw);
}
}
static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan)
{
struct xgene_dma_chan *chan = to_dma_chan(dchan);
/* Has this channel already been allocated? */
if (chan->desc_pool)
return 1;
chan->desc_pool = dma_pool_create(chan->name, chan->dev,
sizeof(struct xgene_dma_desc_sw),
0, 0);
if (!chan->desc_pool) {
chan_err(chan, "Failed to allocate descriptor pool\n");
return -ENOMEM;
}
chan_dbg(chan, "Allocate descriptor pool\n");
return 1;
}
/**
* xgene_dma_free_desc_list - Free all descriptors in a queue
* @chan: X-Gene DMA channel
* @list: the list to free
*
* LOCKING: must hold chan->lock
*/
static void xgene_dma_free_desc_list(struct xgene_dma_chan *chan,
struct list_head *list)
{
struct xgene_dma_desc_sw *desc, *_desc;
list_for_each_entry_safe(desc, _desc, list, node)
xgene_dma_clean_descriptor(chan, desc);
}
static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
{
struct xgene_dma_chan *chan = to_dma_chan(dchan);
chan_dbg(chan, "Free all resources\n");
if (!chan->desc_pool)
return;
/* Process all running descriptor */
xgene_dma_cleanup_descriptors(chan);
spin_lock_bh(&chan->lock);
/* Clean all link descriptor queues */
xgene_dma_free_desc_list(chan, &chan->ld_pending);
xgene_dma_free_desc_list(chan, &chan->ld_running);
xgene_dma_free_desc_list(chan, &chan->ld_completed);
spin_unlock_bh(&chan->lock);
/* Delete this channel DMA pool */
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
}
static struct dma_async_tx_descriptor *xgene_dma_prep_xor(
struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src,
u32 src_cnt, size_t len, unsigned long flags)
{
struct xgene_dma_desc_sw *first = NULL, *new;
struct xgene_dma_chan *chan;
static u8 multi[XGENE_DMA_MAX_XOR_SRC] = {
0x01, 0x01, 0x01, 0x01, 0x01};
if (unlikely(!dchan || !len))
return NULL;
chan = to_dma_chan(dchan);
do {
/* Allocate the link descriptor from DMA pool */
new = xgene_dma_alloc_descriptor(chan);
if (!new)
goto fail;
/* Prepare xor DMA descriptor */
xgene_dma_prep_xor_desc(chan, new, &dst, src,
src_cnt, &len, multi);
if (!first)
first = new;
new->tx.cookie = 0;
async_tx_ack(&new->tx);
/* Insert the link descriptor to the LD ring */
list_add_tail(&new->node, &first->tx_list);
} while (len);
new->tx.flags = flags; /* client is in control of this ack */
new->tx.cookie = -EBUSY;
list_splice(&first->tx_list, &new->tx_list);
return &new->tx;
fail:
if (!first)
return NULL;
xgene_dma_free_desc_list(chan, &first->tx_list);
return NULL;
}
static struct dma_async_tx_descriptor *xgene_dma_prep_pq(
struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src,
u32 src_cnt, const u8 *scf, size_t len, unsigned long flags)
{
struct xgene_dma_desc_sw *first = NULL, *new;
struct xgene_dma_chan *chan;
size_t _len = len;
dma_addr_t _src[XGENE_DMA_MAX_XOR_SRC];
static u8 multi[XGENE_DMA_MAX_XOR_SRC] = {0x01, 0x01, 0x01, 0x01, 0x01};
if (unlikely(!dchan || !len))
return NULL;
chan = to_dma_chan(dchan);
/*
* Save source addresses on local variable, may be we have to
* prepare two descriptor to generate P and Q if both enabled
* in the flags by client
*/
memcpy(_src, src, sizeof(*src) * src_cnt);
if (flags & DMA_PREP_PQ_DISABLE_P)
len = 0;
if (flags & DMA_PREP_PQ_DISABLE_Q)
_len = 0;
do {
/* Allocate the link descriptor from DMA pool */
new = xgene_dma_alloc_descriptor(chan);
if (!new)
goto fail;
if (!first)
first = new;
new->tx.cookie = 0;
async_tx_ack(&new->tx);
/* Insert the link descriptor to the LD ring */
list_add_tail(&new->node, &first->tx_list);
/*
* Prepare DMA descriptor to generate P,
* if DMA_PREP_PQ_DISABLE_P flag is not set
*/
if (len) {
xgene_dma_prep_xor_desc(chan, new, &dst[0], src,
src_cnt, &len, multi);
continue;
}
/*
* Prepare DMA descriptor to generate Q,
* if DMA_PREP_PQ_DISABLE_Q flag is not set
*/
if (_len) {
xgene_dma_prep_xor_desc(chan, new, &dst[1], _src,
src_cnt, &_len, scf);
}
} while (len || _len);
new->tx.flags = flags; /* client is in control of this ack */
new->tx.cookie = -EBUSY;
list_splice(&first->tx_list, &new->tx_list);
return &new->tx;
fail:
if (!first)
return NULL;
xgene_dma_free_desc_list(chan, &first->tx_list);
return NULL;
}
static void xgene_dma_issue_pending(struct dma_chan *dchan)
{
struct xgene_dma_chan *chan = to_dma_chan(dchan);
spin_lock_bh(&chan->lock);
xgene_chan_xfer_ld_pending(chan);
spin_unlock_bh(&chan->lock);
}
static enum dma_status xgene_dma_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(dchan, cookie, txstate);
}
static void xgene_dma_tasklet_cb(struct tasklet_struct *t)
{
struct xgene_dma_chan *chan = from_tasklet(chan, t, tasklet);
/* Run all cleanup for descriptors which have been completed */
xgene_dma_cleanup_descriptors(chan);
/* Re-enable DMA channel IRQ */
enable_irq(chan->rx_irq);
}
static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id)
{
struct xgene_dma_chan *chan = (struct xgene_dma_chan *)id;
BUG_ON(!chan);
/*
* Disable DMA channel IRQ until we process completed
* descriptors
*/
disable_irq_nosync(chan->rx_irq);
/*
* Schedule the tasklet to handle all cleanup of the current
* transaction. It will start a new transaction if there is
* one pending.
*/
tasklet_schedule(&chan->tasklet);
return IRQ_HANDLED;
}
static irqreturn_t xgene_dma_err_isr(int irq, void *id)
{
struct xgene_dma *pdma = (struct xgene_dma *)id;
unsigned long int_mask;
u32 val, i;
val = ioread32(pdma->csr_dma + XGENE_DMA_INT);
/* Clear DMA interrupts */
iowrite32(val, pdma->csr_dma + XGENE_DMA_INT);
/* Print DMA error info */
int_mask = val >> XGENE_DMA_INT_MASK_SHIFT;
for_each_set_bit(i, &int_mask, ARRAY_SIZE(xgene_dma_err))
dev_err(pdma->dev,
"Interrupt status 0x%08X %s\n", val, xgene_dma_err[i]);
return IRQ_HANDLED;
}
static void xgene_dma_wr_ring_state(struct xgene_dma_ring *ring)
{
int i;
iowrite32(ring->num, ring->pdma->csr_ring + XGENE_DMA_RING_STATE);
for (i = 0; i < XGENE_DMA_RING_NUM_CONFIG; i++)
iowrite32(ring->state[i], ring->pdma->csr_ring +
XGENE_DMA_RING_STATE_WR_BASE + (i * 4));
}
static void xgene_dma_clr_ring_state(struct xgene_dma_ring *ring)
{
memset(ring->state, 0, sizeof(u32) * XGENE_DMA_RING_NUM_CONFIG);
xgene_dma_wr_ring_state(ring);
}
static void xgene_dma_setup_ring(struct xgene_dma_ring *ring)
{
void *ring_cfg = ring->state;
u64 addr = ring->desc_paddr;
u32 i, val;
ring->slots = ring->size / XGENE_DMA_RING_WQ_DESC_SIZE;
/* Clear DMA ring state */
xgene_dma_clr_ring_state(ring);
/* Set DMA ring type */
XGENE_DMA_RING_TYPE_SET(ring_cfg, XGENE_DMA_RING_TYPE_REGULAR);
if (ring->owner == XGENE_DMA_RING_OWNER_DMA) {
/* Set recombination buffer and timeout */
XGENE_DMA_RING_RECOMBBUF_SET(ring_cfg);
XGENE_DMA_RING_RECOMTIMEOUTL_SET(ring_cfg);
XGENE_DMA_RING_RECOMTIMEOUTH_SET(ring_cfg);
}
/* Initialize DMA ring state */
XGENE_DMA_RING_SELTHRSH_SET(ring_cfg);
XGENE_DMA_RING_ACCEPTLERR_SET(ring_cfg);
XGENE_DMA_RING_COHERENT_SET(ring_cfg);
XGENE_DMA_RING_ADDRL_SET(ring_cfg, addr);
XGENE_DMA_RING_ADDRH_SET(ring_cfg, addr);
XGENE_DMA_RING_SIZE_SET(ring_cfg, ring->cfgsize);
/* Write DMA ring configurations */
xgene_dma_wr_ring_state(ring);
/* Set DMA ring id */
iowrite32(XGENE_DMA_RING_ID_SETUP(ring->id),
ring->pdma->csr_ring + XGENE_DMA_RING_ID);
/* Set DMA ring buffer */
iowrite32(XGENE_DMA_RING_ID_BUF_SETUP(ring->num),
ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF);
if (ring->owner != XGENE_DMA_RING_OWNER_CPU)
return;
/* Set empty signature to DMA Rx ring descriptors */
for (i = 0; i < ring->slots; i++) {
struct xgene_dma_desc_hw *desc;
desc = &ring->desc_hw[i];
desc->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
}
/* Enable DMA Rx ring interrupt */
val = ioread32(ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE);
XGENE_DMA_RING_NE_INT_MODE_SET(val, ring->buf_num);
iowrite32(val, ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE);
}
static void xgene_dma_clear_ring(struct xgene_dma_ring *ring)
{
u32 ring_id, val;
if (ring->owner == XGENE_DMA_RING_OWNER_CPU) {
/* Disable DMA Rx ring interrupt */
val = ioread32(ring->pdma->csr_ring +
XGENE_DMA_RING_NE_INT_MODE);
XGENE_DMA_RING_NE_INT_MODE_RESET(val, ring->buf_num);
iowrite32(val, ring->pdma->csr_ring +
XGENE_DMA_RING_NE_INT_MODE);
}
/* Clear DMA ring state */
ring_id = XGENE_DMA_RING_ID_SETUP(ring->id);
iowrite32(ring_id, ring->pdma->csr_ring + XGENE_DMA_RING_ID);
iowrite32(0, ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF);
xgene_dma_clr_ring_state(ring);
}
static void xgene_dma_set_ring_cmd(struct xgene_dma_ring *ring)
{
ring->cmd_base = ring->pdma->csr_ring_cmd +
XGENE_DMA_RING_CMD_BASE_OFFSET((ring->num -
XGENE_DMA_RING_NUM));
ring->cmd = ring->cmd_base + XGENE_DMA_RING_CMD_OFFSET;
}
static int xgene_dma_get_ring_size(struct xgene_dma_chan *chan,
enum xgene_dma_ring_cfgsize cfgsize)
{
int size;
switch (cfgsize) {
case XGENE_DMA_RING_CFG_SIZE_512B:
size = 0x200;
break;
case XGENE_DMA_RING_CFG_SIZE_2KB:
size = 0x800;
break;
case XGENE_DMA_RING_CFG_SIZE_16KB:
size = 0x4000;
break;
case XGENE_DMA_RING_CFG_SIZE_64KB:
size = 0x10000;
break;
case XGENE_DMA_RING_CFG_SIZE_512KB:
size = 0x80000;
break;
default:
chan_err(chan, "Unsupported cfg ring size %d\n", cfgsize);
return -EINVAL;
}
return size;
}
static void xgene_dma_delete_ring_one(struct xgene_dma_ring *ring)
{
/* Clear DMA ring configurations */
xgene_dma_clear_ring(ring);
/* De-allocate DMA ring descriptor */
if (ring->desc_vaddr) {
dma_free_coherent(ring->pdma->dev, ring->size,
ring->desc_vaddr, ring->desc_paddr);
ring->desc_vaddr = NULL;
}
}
static void xgene_dma_delete_chan_rings(struct xgene_dma_chan *chan)
{
xgene_dma_delete_ring_one(&chan->rx_ring);
xgene_dma_delete_ring_one(&chan->tx_ring);
}
static int xgene_dma_create_ring_one(struct xgene_dma_chan *chan,
struct xgene_dma_ring *ring,
enum xgene_dma_ring_cfgsize cfgsize)
{
int ret;
/* Setup DMA ring descriptor variables */
ring->pdma = chan->pdma;
ring->cfgsize = cfgsize;
ring->num = chan->pdma->ring_num++;
ring->id = XGENE_DMA_RING_ID_GET(ring->owner, ring->buf_num);
ret = xgene_dma_get_ring_size(chan, cfgsize);
if (ret <= 0)
return ret;
ring->size = ret;
/* Allocate memory for DMA ring descriptor */
ring->desc_vaddr = dma_alloc_coherent(chan->dev, ring->size,
&ring->desc_paddr, GFP_KERNEL);
if (!ring->desc_vaddr) {
chan_err(chan, "Failed to allocate ring desc\n");
return -ENOMEM;
}
/* Configure and enable DMA ring */
xgene_dma_set_ring_cmd(ring);
xgene_dma_setup_ring(ring);
return 0;
}
static int xgene_dma_create_chan_rings(struct xgene_dma_chan *chan)
{
struct xgene_dma_ring *rx_ring = &chan->rx_ring;
struct xgene_dma_ring *tx_ring = &chan->tx_ring;
int ret;
/* Create DMA Rx ring descriptor */
rx_ring->owner = XGENE_DMA_RING_OWNER_CPU;
rx_ring->buf_num = XGENE_DMA_CPU_BUFNUM + chan->id;
ret = xgene_dma_create_ring_one(chan, rx_ring,
XGENE_DMA_RING_CFG_SIZE_64KB);
if (ret)
return ret;
chan_dbg(chan, "Rx ring id 0x%X num %d desc 0x%p\n",
rx_ring->id, rx_ring->num, rx_ring->desc_vaddr);
/* Create DMA Tx ring descriptor */
tx_ring->owner = XGENE_DMA_RING_OWNER_DMA;
tx_ring->buf_num = XGENE_DMA_BUFNUM + chan->id;
ret = xgene_dma_create_ring_one(chan, tx_ring,
XGENE_DMA_RING_CFG_SIZE_64KB);
if (ret) {
xgene_dma_delete_ring_one(rx_ring);
return ret;
}
tx_ring->dst_ring_num = XGENE_DMA_RING_DST_ID(rx_ring->num);
chan_dbg(chan,
"Tx ring id 0x%X num %d desc 0x%p\n",
tx_ring->id, tx_ring->num, tx_ring->desc_vaddr);
/* Set the max outstanding request possible to this channel */
chan->max_outstanding = tx_ring->slots;
return ret;
}
static int xgene_dma_init_rings(struct xgene_dma *pdma)
{
int ret, i, j;
for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
ret = xgene_dma_create_chan_rings(&pdma->chan[i]);
if (ret) {
for (j = 0; j < i; j++)
xgene_dma_delete_chan_rings(&pdma->chan[j]);
return ret;
}
}
return ret;
}
static void xgene_dma_enable(struct xgene_dma *pdma)
{
u32 val;
/* Configure and enable DMA engine */
val = ioread32(pdma->csr_dma + XGENE_DMA_GCR);
XGENE_DMA_CH_SETUP(val);
XGENE_DMA_ENABLE(val);
iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR);
}
static void xgene_dma_disable(struct xgene_dma *pdma)
{
u32 val;
val = ioread32(pdma->csr_dma + XGENE_DMA_GCR);
XGENE_DMA_DISABLE(val);
iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR);
}
static void xgene_dma_mask_interrupts(struct xgene_dma *pdma)
{
/*
* Mask DMA ring overflow, underflow and
* AXI write/read error interrupts
*/
iowrite32(XGENE_DMA_INT_ALL_MASK,
pdma->csr_dma + XGENE_DMA_RING_INT0_MASK);
iowrite32(XGENE_DMA_INT_ALL_MASK,
pdma->csr_dma + XGENE_DMA_RING_INT1_MASK);
iowrite32(XGENE_DMA_INT_ALL_MASK,
pdma->csr_dma + XGENE_DMA_RING_INT2_MASK);
iowrite32(XGENE_DMA_INT_ALL_MASK,
pdma->csr_dma + XGENE_DMA_RING_INT3_MASK);
iowrite32(XGENE_DMA_INT_ALL_MASK,
pdma->csr_dma + XGENE_DMA_RING_INT4_MASK);
/* Mask DMA error interrupts */
iowrite32(XGENE_DMA_INT_ALL_MASK, pdma->csr_dma + XGENE_DMA_INT_MASK);
}
static void xgene_dma_unmask_interrupts(struct xgene_dma *pdma)
{
/*
* Unmask DMA ring overflow, underflow and
* AXI write/read error interrupts
*/
iowrite32(XGENE_DMA_INT_ALL_UNMASK,
pdma->csr_dma + XGENE_DMA_RING_INT0_MASK);
iowrite32(XGENE_DMA_INT_ALL_UNMASK,
pdma->csr_dma + XGENE_DMA_RING_INT1_MASK);
iowrite32(XGENE_DMA_INT_ALL_UNMASK,
pdma->csr_dma + XGENE_DMA_RING_INT2_MASK);
iowrite32(XGENE_DMA_INT_ALL_UNMASK,
pdma->csr_dma + XGENE_DMA_RING_INT3_MASK);
iowrite32(XGENE_DMA_INT_ALL_UNMASK,
pdma->csr_dma + XGENE_DMA_RING_INT4_MASK);
/* Unmask DMA error interrupts */
iowrite32(XGENE_DMA_INT_ALL_UNMASK,
pdma->csr_dma + XGENE_DMA_INT_MASK);
}
static void xgene_dma_init_hw(struct xgene_dma *pdma)
{
u32 val;
/* Associate DMA ring to corresponding ring HW */
iowrite32(XGENE_DMA_ASSOC_RING_MNGR1,
pdma->csr_dma + XGENE_DMA_CFG_RING_WQ_ASSOC);
/* Configure RAID6 polynomial control setting */
if (is_pq_enabled(pdma))
iowrite32(XGENE_DMA_RAID6_MULTI_CTRL(0x1D),
pdma->csr_dma + XGENE_DMA_RAID6_CONT);
else
dev_info(pdma->dev, "PQ is disabled in HW\n");
xgene_dma_enable(pdma);
xgene_dma_unmask_interrupts(pdma);
/* Get DMA id and version info */
val = ioread32(pdma->csr_dma + XGENE_DMA_IPBRR);
/* DMA device info */
dev_info(pdma->dev,
"X-Gene DMA v%d.%02d.%02d driver registered %d channels",
XGENE_DMA_REV_NO_RD(val), XGENE_DMA_BUS_ID_RD(val),
XGENE_DMA_DEV_ID_RD(val), XGENE_DMA_MAX_CHANNEL);
}
static int xgene_dma_init_ring_mngr(struct xgene_dma *pdma)
{
if (ioread32(pdma->csr_ring + XGENE_DMA_RING_CLKEN) &&
(!ioread32(pdma->csr_ring + XGENE_DMA_RING_SRST)))
return 0;
iowrite32(0x3, pdma->csr_ring + XGENE_DMA_RING_CLKEN);
iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_SRST);
/* Bring up memory */
iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN);
/* Force a barrier */
ioread32(pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN);
/* reset may take up to 1ms */
usleep_range(1000, 1100);
if (ioread32(pdma->csr_ring + XGENE_DMA_RING_BLK_MEM_RDY)
!= XGENE_DMA_RING_BLK_MEM_RDY_VAL) {
dev_err(pdma->dev,
"Failed to release ring mngr memory from shutdown\n");
return -ENODEV;
}
/* program threshold set 1 and all hysteresis */
iowrite32(XGENE_DMA_RING_THRESLD0_SET1_VAL,
pdma->csr_ring + XGENE_DMA_RING_THRESLD0_SET1);
iowrite32(XGENE_DMA_RING_THRESLD1_SET1_VAL,
pdma->csr_ring + XGENE_DMA_RING_THRESLD1_SET1);
iowrite32(XGENE_DMA_RING_HYSTERESIS_VAL,
pdma->csr_ring + XGENE_DMA_RING_HYSTERESIS);
/* Enable QPcore and assign error queue */
iowrite32(XGENE_DMA_RING_ENABLE,
pdma->csr_ring + XGENE_DMA_RING_CONFIG);
return 0;
}
static int xgene_dma_init_mem(struct xgene_dma *pdma)
{
int ret;
ret = xgene_dma_init_ring_mngr(pdma);
if (ret)
return ret;
/* Bring up memory */
iowrite32(0x0, pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN);
/* Force a barrier */
ioread32(pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN);
/* reset may take up to 1ms */
usleep_range(1000, 1100);
if (ioread32(pdma->csr_dma + XGENE_DMA_BLK_MEM_RDY)
!= XGENE_DMA_BLK_MEM_RDY_VAL) {
dev_err(pdma->dev,
"Failed to release DMA memory from shutdown\n");
return -ENODEV;
}
return 0;
}
static int xgene_dma_request_irqs(struct xgene_dma *pdma)
{
struct xgene_dma_chan *chan;
int ret, i, j;
/* Register DMA error irq */
ret = devm_request_irq(pdma->dev, pdma->err_irq, xgene_dma_err_isr,
0, "dma_error", pdma);
if (ret) {
dev_err(pdma->dev,
"Failed to register error IRQ %d\n", pdma->err_irq);
return ret;
}
/* Register DMA channel rx irq */
for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
chan = &pdma->chan[i];
irq_set_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);
ret = devm_request_irq(chan->dev, chan->rx_irq,
xgene_dma_chan_ring_isr,
0, chan->name, chan);
if (ret) {
chan_err(chan, "Failed to register Rx IRQ %d\n",
chan->rx_irq);
devm_free_irq(pdma->dev, pdma->err_irq, pdma);
for (j = 0; j < i; j++) {
chan = &pdma->chan[i];
irq_clear_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);
devm_free_irq(chan->dev, chan->rx_irq, chan);
}
return ret;
}
}
return 0;
}
static void xgene_dma_free_irqs(struct xgene_dma *pdma)
{
struct xgene_dma_chan *chan;
int i;
/* Free DMA device error irq */
devm_free_irq(pdma->dev, pdma->err_irq, pdma);
for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
chan = &pdma->chan[i];
irq_clear_status_flags(chan->rx_irq, IRQ_DISABLE_UNLAZY);
devm_free_irq(chan->dev, chan->rx_irq, chan);
}
}
static void xgene_dma_set_caps(struct xgene_dma_chan *chan,
struct dma_device *dma_dev)
{
/* Initialize DMA device capability mask */
dma_cap_zero(dma_dev->cap_mask);
/* Set DMA device capability */
/* Basically here, the X-Gene SoC DMA engine channel 0 supports XOR
* and channel 1 supports XOR, PQ both. First thing here is we have
* mechanism in hw to enable/disable PQ/XOR supports on channel 1,
* we can make sure this by reading SoC Efuse register.
* Second thing, we have hw errata that if we run channel 0 and
* channel 1 simultaneously with executing XOR and PQ request,
* suddenly DMA engine hangs, So here we enable XOR on channel 0 only
* if XOR and PQ supports on channel 1 is disabled.
*/
if ((chan->id == XGENE_DMA_PQ_CHANNEL) &&
is_pq_enabled(chan->pdma)) {
dma_cap_set(DMA_PQ, dma_dev->cap_mask);
dma_cap_set(DMA_XOR, dma_dev->cap_mask);
} else if ((chan->id == XGENE_DMA_XOR_CHANNEL) &&
!is_pq_enabled(chan->pdma)) {
dma_cap_set(DMA_XOR, dma_dev->cap_mask);
}
/* Set base and prep routines */
dma_dev->dev = chan->dev;
dma_dev->device_alloc_chan_resources = xgene_dma_alloc_chan_resources;
dma_dev->device_free_chan_resources = xgene_dma_free_chan_resources;
dma_dev->device_issue_pending = xgene_dma_issue_pending;
dma_dev->device_tx_status = xgene_dma_tx_status;
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
dma_dev->device_prep_dma_xor = xgene_dma_prep_xor;
dma_dev->max_xor = XGENE_DMA_MAX_XOR_SRC;
dma_dev->xor_align = DMAENGINE_ALIGN_64_BYTES;
}
if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
dma_dev->device_prep_dma_pq = xgene_dma_prep_pq;
dma_dev->max_pq = XGENE_DMA_MAX_XOR_SRC;
dma_dev->pq_align = DMAENGINE_ALIGN_64_BYTES;
}
}
static int xgene_dma_async_register(struct xgene_dma *pdma, int id)
{
struct xgene_dma_chan *chan = &pdma->chan[id];
struct dma_device *dma_dev = &pdma->dma_dev[id];
int ret;
chan->dma_chan.device = dma_dev;
spin_lock_init(&chan->lock);
INIT_LIST_HEAD(&chan->ld_pending);
INIT_LIST_HEAD(&chan->ld_running);
INIT_LIST_HEAD(&chan->ld_completed);
tasklet_setup(&chan->tasklet, xgene_dma_tasklet_cb);
chan->pending = 0;
chan->desc_pool = NULL;
dma_cookie_init(&chan->dma_chan);
/* Setup dma device capabilities and prep routines */
xgene_dma_set_caps(chan, dma_dev);
/* Initialize DMA device list head */
INIT_LIST_HEAD(&dma_dev->channels);
list_add_tail(&chan->dma_chan.device_node, &dma_dev->channels);
/* Register with Linux async DMA framework*/
ret = dma_async_device_register(dma_dev);
if (ret) {
chan_err(chan, "Failed to register async device %d", ret);
tasklet_kill(&chan->tasklet);
return ret;
}
/* DMA capability info */
dev_info(pdma->dev,
"%s: CAPABILITY ( %s%s)\n", dma_chan_name(&chan->dma_chan),
dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "XOR " : "",
dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "PQ " : "");
return 0;
}
static int xgene_dma_init_async(struct xgene_dma *pdma)
{
int ret, i, j;
for (i = 0; i < XGENE_DMA_MAX_CHANNEL ; i++) {
ret = xgene_dma_async_register(pdma, i);
if (ret) {
for (j = 0; j < i; j++) {
dma_async_device_unregister(&pdma->dma_dev[j]);
tasklet_kill(&pdma->chan[j].tasklet);
}
return ret;
}
}
return ret;
}
static void xgene_dma_async_unregister(struct xgene_dma *pdma)
{
int i;
for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++)
dma_async_device_unregister(&pdma->dma_dev[i]);
}
static void xgene_dma_init_channels(struct xgene_dma *pdma)
{
struct xgene_dma_chan *chan;
int i;
pdma->ring_num = XGENE_DMA_RING_NUM;
for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
chan = &pdma->chan[i];
chan->dev = pdma->dev;
chan->pdma = pdma;
chan->id = i;
snprintf(chan->name, sizeof(chan->name), "dmachan%d", chan->id);
}
}
static int xgene_dma_get_resources(struct platform_device *pdev,
struct xgene_dma *pdma)
{
struct resource *res;
int irq, i;
/* Get DMA csr region */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Failed to get csr region\n");
return -ENXIO;
}
pdma->csr_dma = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!pdma->csr_dma) {
dev_err(&pdev->dev, "Failed to ioremap csr region");
return -ENOMEM;
}
/* Get DMA ring csr region */
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(&pdev->dev, "Failed to get ring csr region\n");
return -ENXIO;
}
pdma->csr_ring = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!pdma->csr_ring) {
dev_err(&pdev->dev, "Failed to ioremap ring csr region");
return -ENOMEM;
}
/* Get DMA ring cmd csr region */
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
if (!res) {
dev_err(&pdev->dev, "Failed to get ring cmd csr region\n");
return -ENXIO;
}
pdma->csr_ring_cmd = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!pdma->csr_ring_cmd) {
dev_err(&pdev->dev, "Failed to ioremap ring cmd csr region");
return -ENOMEM;
}
pdma->csr_ring_cmd += XGENE_DMA_RING_CMD_SM_OFFSET;
/* Get efuse csr region */
res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
if (!res) {
dev_err(&pdev->dev, "Failed to get efuse csr region\n");
return -ENXIO;
}
pdma->csr_efuse = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!pdma->csr_efuse) {
dev_err(&pdev->dev, "Failed to ioremap efuse csr region");
return -ENOMEM;
}
/* Get DMA error interrupt */
irq = platform_get_irq(pdev, 0);
if (irq <= 0)
return -ENXIO;
pdma->err_irq = irq;
/* Get DMA Rx ring descriptor interrupts for all DMA channels */
for (i = 1; i <= XGENE_DMA_MAX_CHANNEL; i++) {
irq = platform_get_irq(pdev, i);
if (irq <= 0)
return -ENXIO;
pdma->chan[i - 1].rx_irq = irq;
}
return 0;
}
static int xgene_dma_probe(struct platform_device *pdev)
{
struct xgene_dma *pdma;
int ret, i;
pdma = devm_kzalloc(&pdev->dev, sizeof(*pdma), GFP_KERNEL);
if (!pdma)
return -ENOMEM;
pdma->dev = &pdev->dev;
platform_set_drvdata(pdev, pdma);
ret = xgene_dma_get_resources(pdev, pdma);
if (ret)
return ret;
pdma->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(pdma->clk) && !ACPI_COMPANION(&pdev->dev)) {
dev_err(&pdev->dev, "Failed to get clk\n");
return PTR_ERR(pdma->clk);
}
/* Enable clk before accessing registers */
if (!IS_ERR(pdma->clk)) {
ret = clk_prepare_enable(pdma->clk);
if (ret) {
dev_err(&pdev->dev, "Failed to enable clk %d\n", ret);
return ret;
}
}
/* Remove DMA RAM out of shutdown */
ret = xgene_dma_init_mem(pdma);
if (ret)
goto err_clk_enable;
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(42));
if (ret) {
dev_err(&pdev->dev, "No usable DMA configuration\n");
goto err_dma_mask;
}
/* Initialize DMA channels software state */
xgene_dma_init_channels(pdma);
/* Configue DMA rings */
ret = xgene_dma_init_rings(pdma);
if (ret)
goto err_clk_enable;
ret = xgene_dma_request_irqs(pdma);
if (ret)
goto err_request_irq;
/* Configure and enable DMA engine */
xgene_dma_init_hw(pdma);
/* Register DMA device with linux async framework */
ret = xgene_dma_init_async(pdma);
if (ret)
goto err_async_init;
return 0;
err_async_init:
xgene_dma_free_irqs(pdma);
err_request_irq:
for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++)
xgene_dma_delete_chan_rings(&pdma->chan[i]);
err_dma_mask:
err_clk_enable:
if (!IS_ERR(pdma->clk))
clk_disable_unprepare(pdma->clk);
return ret;
}
static int xgene_dma_remove(struct platform_device *pdev)
{
struct xgene_dma *pdma = platform_get_drvdata(pdev);
struct xgene_dma_chan *chan;
int i;
xgene_dma_async_unregister(pdma);
/* Mask interrupts and disable DMA engine */
xgene_dma_mask_interrupts(pdma);
xgene_dma_disable(pdma);
xgene_dma_free_irqs(pdma);
for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
chan = &pdma->chan[i];
tasklet_kill(&chan->tasklet);
xgene_dma_delete_chan_rings(chan);
}
if (!IS_ERR(pdma->clk))
clk_disable_unprepare(pdma->clk);
return 0;
}
#ifdef CONFIG_ACPI
static const struct acpi_device_id xgene_dma_acpi_match_ptr[] = {
{"APMC0D43", 0},
{},
};
MODULE_DEVICE_TABLE(acpi, xgene_dma_acpi_match_ptr);
#endif
static const struct of_device_id xgene_dma_of_match_ptr[] = {
{.compatible = "apm,xgene-storm-dma",},
{},
};
MODULE_DEVICE_TABLE(of, xgene_dma_of_match_ptr);
static struct platform_driver xgene_dma_driver = {
.probe = xgene_dma_probe,
.remove = xgene_dma_remove,
.driver = {
.name = "X-Gene-DMA",
.of_match_table = xgene_dma_of_match_ptr,
.acpi_match_table = ACPI_PTR(xgene_dma_acpi_match_ptr),
},
};
module_platform_driver(xgene_dma_driver);
MODULE_DESCRIPTION("APM X-Gene SoC DMA driver");
MODULE_AUTHOR("Rameshwar Prasad Sahu <[email protected]>");
MODULE_AUTHOR("Loc Ho <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.0");
| linux-master | drivers/dma/xgene-dma.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Microsemi Switchtec(tm) PCIe Management Driver
* Copyright (c) 2019, Logan Gunthorpe <[email protected]>
* Copyright (c) 2019, GigaIO Networks, Inc
*/
#include "dmaengine.h"
#include <linux/circ_buf.h>
#include <linux/dmaengine.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/pci.h>
MODULE_DESCRIPTION("PLX ExpressLane PEX PCI Switch DMA Engine");
MODULE_VERSION("0.1");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Logan Gunthorpe");
#define PLX_REG_DESC_RING_ADDR 0x214
#define PLX_REG_DESC_RING_ADDR_HI 0x218
#define PLX_REG_DESC_RING_NEXT_ADDR 0x21C
#define PLX_REG_DESC_RING_COUNT 0x220
#define PLX_REG_DESC_RING_LAST_ADDR 0x224
#define PLX_REG_DESC_RING_LAST_SIZE 0x228
#define PLX_REG_PREF_LIMIT 0x234
#define PLX_REG_CTRL 0x238
#define PLX_REG_CTRL2 0x23A
#define PLX_REG_INTR_CTRL 0x23C
#define PLX_REG_INTR_STATUS 0x23E
#define PLX_REG_PREF_LIMIT_PREF_FOUR 8
#define PLX_REG_CTRL_GRACEFUL_PAUSE BIT(0)
#define PLX_REG_CTRL_ABORT BIT(1)
#define PLX_REG_CTRL_WRITE_BACK_EN BIT(2)
#define PLX_REG_CTRL_START BIT(3)
#define PLX_REG_CTRL_RING_STOP_MODE BIT(4)
#define PLX_REG_CTRL_DESC_MODE_BLOCK (0 << 5)
#define PLX_REG_CTRL_DESC_MODE_ON_CHIP (1 << 5)
#define PLX_REG_CTRL_DESC_MODE_OFF_CHIP (2 << 5)
#define PLX_REG_CTRL_DESC_INVALID BIT(8)
#define PLX_REG_CTRL_GRACEFUL_PAUSE_DONE BIT(9)
#define PLX_REG_CTRL_ABORT_DONE BIT(10)
#define PLX_REG_CTRL_IMM_PAUSE_DONE BIT(12)
#define PLX_REG_CTRL_IN_PROGRESS BIT(30)
#define PLX_REG_CTRL_RESET_VAL (PLX_REG_CTRL_DESC_INVALID | \
PLX_REG_CTRL_GRACEFUL_PAUSE_DONE | \
PLX_REG_CTRL_ABORT_DONE | \
PLX_REG_CTRL_IMM_PAUSE_DONE)
#define PLX_REG_CTRL_START_VAL (PLX_REG_CTRL_WRITE_BACK_EN | \
PLX_REG_CTRL_DESC_MODE_OFF_CHIP | \
PLX_REG_CTRL_START | \
PLX_REG_CTRL_RESET_VAL)
#define PLX_REG_CTRL2_MAX_TXFR_SIZE_64B 0
#define PLX_REG_CTRL2_MAX_TXFR_SIZE_128B 1
#define PLX_REG_CTRL2_MAX_TXFR_SIZE_256B 2
#define PLX_REG_CTRL2_MAX_TXFR_SIZE_512B 3
#define PLX_REG_CTRL2_MAX_TXFR_SIZE_1KB 4
#define PLX_REG_CTRL2_MAX_TXFR_SIZE_2KB 5
#define PLX_REG_CTRL2_MAX_TXFR_SIZE_4B 7
#define PLX_REG_INTR_CRTL_ERROR_EN BIT(0)
#define PLX_REG_INTR_CRTL_INV_DESC_EN BIT(1)
#define PLX_REG_INTR_CRTL_ABORT_DONE_EN BIT(3)
#define PLX_REG_INTR_CRTL_PAUSE_DONE_EN BIT(4)
#define PLX_REG_INTR_CRTL_IMM_PAUSE_DONE_EN BIT(5)
#define PLX_REG_INTR_STATUS_ERROR BIT(0)
#define PLX_REG_INTR_STATUS_INV_DESC BIT(1)
#define PLX_REG_INTR_STATUS_DESC_DONE BIT(2)
#define PLX_REG_INTR_CRTL_ABORT_DONE BIT(3)
struct plx_dma_hw_std_desc {
__le32 flags_and_size;
__le16 dst_addr_hi;
__le16 src_addr_hi;
__le32 dst_addr_lo;
__le32 src_addr_lo;
};
#define PLX_DESC_SIZE_MASK 0x7ffffff
#define PLX_DESC_FLAG_VALID BIT(31)
#define PLX_DESC_FLAG_INT_WHEN_DONE BIT(30)
#define PLX_DESC_WB_SUCCESS BIT(30)
#define PLX_DESC_WB_RD_FAIL BIT(29)
#define PLX_DESC_WB_WR_FAIL BIT(28)
#define PLX_DMA_RING_COUNT 2048
struct plx_dma_desc {
struct dma_async_tx_descriptor txd;
struct plx_dma_hw_std_desc *hw;
u32 orig_size;
};
struct plx_dma_dev {
struct dma_device dma_dev;
struct dma_chan dma_chan;
struct pci_dev __rcu *pdev;
void __iomem *bar;
struct tasklet_struct desc_task;
spinlock_t ring_lock;
bool ring_active;
int head;
int tail;
struct plx_dma_hw_std_desc *hw_ring;
dma_addr_t hw_ring_dma;
struct plx_dma_desc **desc_ring;
};
static struct plx_dma_dev *chan_to_plx_dma_dev(struct dma_chan *c)
{
return container_of(c, struct plx_dma_dev, dma_chan);
}
static struct plx_dma_desc *to_plx_desc(struct dma_async_tx_descriptor *txd)
{
return container_of(txd, struct plx_dma_desc, txd);
}
static struct plx_dma_desc *plx_dma_get_desc(struct plx_dma_dev *plxdev, int i)
{
return plxdev->desc_ring[i & (PLX_DMA_RING_COUNT - 1)];
}
static void plx_dma_process_desc(struct plx_dma_dev *plxdev)
{
struct dmaengine_result res;
struct plx_dma_desc *desc;
u32 flags;
spin_lock(&plxdev->ring_lock);
while (plxdev->tail != plxdev->head) {
desc = plx_dma_get_desc(plxdev, plxdev->tail);
flags = le32_to_cpu(READ_ONCE(desc->hw->flags_and_size));
if (flags & PLX_DESC_FLAG_VALID)
break;
res.residue = desc->orig_size - (flags & PLX_DESC_SIZE_MASK);
if (flags & PLX_DESC_WB_SUCCESS)
res.result = DMA_TRANS_NOERROR;
else if (flags & PLX_DESC_WB_WR_FAIL)
res.result = DMA_TRANS_WRITE_FAILED;
else
res.result = DMA_TRANS_READ_FAILED;
dma_cookie_complete(&desc->txd);
dma_descriptor_unmap(&desc->txd);
dmaengine_desc_get_callback_invoke(&desc->txd, &res);
desc->txd.callback = NULL;
desc->txd.callback_result = NULL;
plxdev->tail++;
}
spin_unlock(&plxdev->ring_lock);
}
static void plx_dma_abort_desc(struct plx_dma_dev *plxdev)
{
struct dmaengine_result res;
struct plx_dma_desc *desc;
plx_dma_process_desc(plxdev);
spin_lock_bh(&plxdev->ring_lock);
while (plxdev->tail != plxdev->head) {
desc = plx_dma_get_desc(plxdev, plxdev->tail);
res.residue = desc->orig_size;
res.result = DMA_TRANS_ABORTED;
dma_cookie_complete(&desc->txd);
dma_descriptor_unmap(&desc->txd);
dmaengine_desc_get_callback_invoke(&desc->txd, &res);
desc->txd.callback = NULL;
desc->txd.callback_result = NULL;
plxdev->tail++;
}
spin_unlock_bh(&plxdev->ring_lock);
}
static void __plx_dma_stop(struct plx_dma_dev *plxdev)
{
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
u32 val;
val = readl(plxdev->bar + PLX_REG_CTRL);
if (!(val & ~PLX_REG_CTRL_GRACEFUL_PAUSE))
return;
writel(PLX_REG_CTRL_RESET_VAL | PLX_REG_CTRL_GRACEFUL_PAUSE,
plxdev->bar + PLX_REG_CTRL);
while (!time_after(jiffies, timeout)) {
val = readl(plxdev->bar + PLX_REG_CTRL);
if (val & PLX_REG_CTRL_GRACEFUL_PAUSE_DONE)
break;
cpu_relax();
}
if (!(val & PLX_REG_CTRL_GRACEFUL_PAUSE_DONE))
dev_err(plxdev->dma_dev.dev,
"Timeout waiting for graceful pause!\n");
writel(PLX_REG_CTRL_RESET_VAL | PLX_REG_CTRL_GRACEFUL_PAUSE,
plxdev->bar + PLX_REG_CTRL);
writel(0, plxdev->bar + PLX_REG_DESC_RING_COUNT);
writel(0, plxdev->bar + PLX_REG_DESC_RING_ADDR);
writel(0, plxdev->bar + PLX_REG_DESC_RING_ADDR_HI);
writel(0, plxdev->bar + PLX_REG_DESC_RING_NEXT_ADDR);
}
static void plx_dma_stop(struct plx_dma_dev *plxdev)
{
rcu_read_lock();
if (!rcu_dereference(plxdev->pdev)) {
rcu_read_unlock();
return;
}
__plx_dma_stop(plxdev);
rcu_read_unlock();
}
static void plx_dma_desc_task(struct tasklet_struct *t)
{
struct plx_dma_dev *plxdev = from_tasklet(plxdev, t, desc_task);
plx_dma_process_desc(plxdev);
}
static struct dma_async_tx_descriptor *plx_dma_prep_memcpy(struct dma_chan *c,
dma_addr_t dma_dst, dma_addr_t dma_src, size_t len,
unsigned long flags)
__acquires(plxdev->ring_lock)
{
struct plx_dma_dev *plxdev = chan_to_plx_dma_dev(c);
struct plx_dma_desc *plxdesc;
spin_lock_bh(&plxdev->ring_lock);
if (!plxdev->ring_active)
goto err_unlock;
if (!CIRC_SPACE(plxdev->head, plxdev->tail, PLX_DMA_RING_COUNT))
goto err_unlock;
if (len > PLX_DESC_SIZE_MASK)
goto err_unlock;
plxdesc = plx_dma_get_desc(plxdev, plxdev->head);
plxdev->head++;
plxdesc->hw->dst_addr_lo = cpu_to_le32(lower_32_bits(dma_dst));
plxdesc->hw->dst_addr_hi = cpu_to_le16(upper_32_bits(dma_dst));
plxdesc->hw->src_addr_lo = cpu_to_le32(lower_32_bits(dma_src));
plxdesc->hw->src_addr_hi = cpu_to_le16(upper_32_bits(dma_src));
plxdesc->orig_size = len;
if (flags & DMA_PREP_INTERRUPT)
len |= PLX_DESC_FLAG_INT_WHEN_DONE;
plxdesc->hw->flags_and_size = cpu_to_le32(len);
plxdesc->txd.flags = flags;
/* return with the lock held, it will be released in tx_submit */
return &plxdesc->txd;
err_unlock:
/*
* Keep sparse happy by restoring an even lock count on
* this lock.
*/
__acquire(plxdev->ring_lock);
spin_unlock_bh(&plxdev->ring_lock);
return NULL;
}
static dma_cookie_t plx_dma_tx_submit(struct dma_async_tx_descriptor *desc)
__releases(plxdev->ring_lock)
{
struct plx_dma_dev *plxdev = chan_to_plx_dma_dev(desc->chan);
struct plx_dma_desc *plxdesc = to_plx_desc(desc);
dma_cookie_t cookie;
cookie = dma_cookie_assign(desc);
/*
* Ensure the descriptor updates are visible to the dma device
* before setting the valid bit.
*/
wmb();
plxdesc->hw->flags_and_size |= cpu_to_le32(PLX_DESC_FLAG_VALID);
spin_unlock_bh(&plxdev->ring_lock);
return cookie;
}
static enum dma_status plx_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct plx_dma_dev *plxdev = chan_to_plx_dma_dev(chan);
enum dma_status ret;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
plx_dma_process_desc(plxdev);
return dma_cookie_status(chan, cookie, txstate);
}
static void plx_dma_issue_pending(struct dma_chan *chan)
{
struct plx_dma_dev *plxdev = chan_to_plx_dma_dev(chan);
rcu_read_lock();
if (!rcu_dereference(plxdev->pdev)) {
rcu_read_unlock();
return;
}
/*
* Ensure the valid bits are visible before starting the
* DMA engine.
*/
wmb();
writew(PLX_REG_CTRL_START_VAL, plxdev->bar + PLX_REG_CTRL);
rcu_read_unlock();
}
static irqreturn_t plx_dma_isr(int irq, void *devid)
{
struct plx_dma_dev *plxdev = devid;
u32 status;
status = readw(plxdev->bar + PLX_REG_INTR_STATUS);
if (!status)
return IRQ_NONE;
if (status & PLX_REG_INTR_STATUS_DESC_DONE && plxdev->ring_active)
tasklet_schedule(&plxdev->desc_task);
writew(status, plxdev->bar + PLX_REG_INTR_STATUS);
return IRQ_HANDLED;
}
static int plx_dma_alloc_desc(struct plx_dma_dev *plxdev)
{
struct plx_dma_desc *desc;
int i;
plxdev->desc_ring = kcalloc(PLX_DMA_RING_COUNT,
sizeof(*plxdev->desc_ring), GFP_KERNEL);
if (!plxdev->desc_ring)
return -ENOMEM;
for (i = 0; i < PLX_DMA_RING_COUNT; i++) {
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
goto free_and_exit;
dma_async_tx_descriptor_init(&desc->txd, &plxdev->dma_chan);
desc->txd.tx_submit = plx_dma_tx_submit;
desc->hw = &plxdev->hw_ring[i];
plxdev->desc_ring[i] = desc;
}
return 0;
free_and_exit:
for (i = 0; i < PLX_DMA_RING_COUNT; i++)
kfree(plxdev->desc_ring[i]);
kfree(plxdev->desc_ring);
return -ENOMEM;
}
static int plx_dma_alloc_chan_resources(struct dma_chan *chan)
{
struct plx_dma_dev *plxdev = chan_to_plx_dma_dev(chan);
size_t ring_sz = PLX_DMA_RING_COUNT * sizeof(*plxdev->hw_ring);
int rc;
plxdev->head = plxdev->tail = 0;
plxdev->hw_ring = dma_alloc_coherent(plxdev->dma_dev.dev, ring_sz,
&plxdev->hw_ring_dma, GFP_KERNEL);
if (!plxdev->hw_ring)
return -ENOMEM;
rc = plx_dma_alloc_desc(plxdev);
if (rc)
goto out_free_hw_ring;
rcu_read_lock();
if (!rcu_dereference(plxdev->pdev)) {
rcu_read_unlock();
rc = -ENODEV;
goto out_free_hw_ring;
}
writel(PLX_REG_CTRL_RESET_VAL, plxdev->bar + PLX_REG_CTRL);
writel(lower_32_bits(plxdev->hw_ring_dma),
plxdev->bar + PLX_REG_DESC_RING_ADDR);
writel(upper_32_bits(plxdev->hw_ring_dma),
plxdev->bar + PLX_REG_DESC_RING_ADDR_HI);
writel(lower_32_bits(plxdev->hw_ring_dma),
plxdev->bar + PLX_REG_DESC_RING_NEXT_ADDR);
writel(PLX_DMA_RING_COUNT, plxdev->bar + PLX_REG_DESC_RING_COUNT);
writel(PLX_REG_PREF_LIMIT_PREF_FOUR, plxdev->bar + PLX_REG_PREF_LIMIT);
plxdev->ring_active = true;
rcu_read_unlock();
return PLX_DMA_RING_COUNT;
out_free_hw_ring:
dma_free_coherent(plxdev->dma_dev.dev, ring_sz, plxdev->hw_ring,
plxdev->hw_ring_dma);
return rc;
}
static void plx_dma_free_chan_resources(struct dma_chan *chan)
{
struct plx_dma_dev *plxdev = chan_to_plx_dma_dev(chan);
size_t ring_sz = PLX_DMA_RING_COUNT * sizeof(*plxdev->hw_ring);
struct pci_dev *pdev;
int irq = -1;
int i;
spin_lock_bh(&plxdev->ring_lock);
plxdev->ring_active = false;
spin_unlock_bh(&plxdev->ring_lock);
plx_dma_stop(plxdev);
rcu_read_lock();
pdev = rcu_dereference(plxdev->pdev);
if (pdev)
irq = pci_irq_vector(pdev, 0);
rcu_read_unlock();
if (irq > 0)
synchronize_irq(irq);
tasklet_kill(&plxdev->desc_task);
plx_dma_abort_desc(plxdev);
for (i = 0; i < PLX_DMA_RING_COUNT; i++)
kfree(plxdev->desc_ring[i]);
kfree(plxdev->desc_ring);
dma_free_coherent(plxdev->dma_dev.dev, ring_sz, plxdev->hw_ring,
plxdev->hw_ring_dma);
}
static void plx_dma_release(struct dma_device *dma_dev)
{
struct plx_dma_dev *plxdev =
container_of(dma_dev, struct plx_dma_dev, dma_dev);
put_device(dma_dev->dev);
kfree(plxdev);
}
static int plx_dma_create(struct pci_dev *pdev)
{
struct plx_dma_dev *plxdev;
struct dma_device *dma;
struct dma_chan *chan;
int rc;
plxdev = kzalloc(sizeof(*plxdev), GFP_KERNEL);
if (!plxdev)
return -ENOMEM;
rc = request_irq(pci_irq_vector(pdev, 0), plx_dma_isr, 0,
KBUILD_MODNAME, plxdev);
if (rc)
goto free_plx;
spin_lock_init(&plxdev->ring_lock);
tasklet_setup(&plxdev->desc_task, plx_dma_desc_task);
RCU_INIT_POINTER(plxdev->pdev, pdev);
plxdev->bar = pcim_iomap_table(pdev)[0];
dma = &plxdev->dma_dev;
INIT_LIST_HEAD(&dma->channels);
dma_cap_set(DMA_MEMCPY, dma->cap_mask);
dma->copy_align = DMAENGINE_ALIGN_1_BYTE;
dma->dev = get_device(&pdev->dev);
dma->device_alloc_chan_resources = plx_dma_alloc_chan_resources;
dma->device_free_chan_resources = plx_dma_free_chan_resources;
dma->device_prep_dma_memcpy = plx_dma_prep_memcpy;
dma->device_issue_pending = plx_dma_issue_pending;
dma->device_tx_status = plx_dma_tx_status;
dma->device_release = plx_dma_release;
chan = &plxdev->dma_chan;
chan->device = dma;
dma_cookie_init(chan);
list_add_tail(&chan->device_node, &dma->channels);
rc = dma_async_device_register(dma);
if (rc) {
pci_err(pdev, "Failed to register dma device: %d\n", rc);
goto put_device;
}
pci_set_drvdata(pdev, plxdev);
return 0;
put_device:
put_device(&pdev->dev);
free_irq(pci_irq_vector(pdev, 0), plxdev);
free_plx:
kfree(plxdev);
return rc;
}
static int plx_dma_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int rc;
rc = pcim_enable_device(pdev);
if (rc)
return rc;
rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(48));
if (rc)
rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (rc)
return rc;
rc = pcim_iomap_regions(pdev, 1, KBUILD_MODNAME);
if (rc)
return rc;
rc = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
if (rc <= 0)
return rc;
pci_set_master(pdev);
rc = plx_dma_create(pdev);
if (rc)
goto err_free_irq_vectors;
pci_info(pdev, "PLX DMA Channel Registered\n");
return 0;
err_free_irq_vectors:
pci_free_irq_vectors(pdev);
return rc;
}
static void plx_dma_remove(struct pci_dev *pdev)
{
struct plx_dma_dev *plxdev = pci_get_drvdata(pdev);
free_irq(pci_irq_vector(pdev, 0), plxdev);
rcu_assign_pointer(plxdev->pdev, NULL);
synchronize_rcu();
spin_lock_bh(&plxdev->ring_lock);
plxdev->ring_active = false;
spin_unlock_bh(&plxdev->ring_lock);
__plx_dma_stop(plxdev);
plx_dma_abort_desc(plxdev);
plxdev->bar = NULL;
dma_async_device_unregister(&plxdev->dma_dev);
pci_free_irq_vectors(pdev);
}
static const struct pci_device_id plx_dma_pci_tbl[] = {
{
.vendor = PCI_VENDOR_ID_PLX,
.device = 0x87D0,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.class = PCI_CLASS_SYSTEM_OTHER << 8,
.class_mask = 0xFFFFFFFF,
},
{0}
};
MODULE_DEVICE_TABLE(pci, plx_dma_pci_tbl);
static struct pci_driver plx_dma_pci_driver = {
.name = KBUILD_MODNAME,
.id_table = plx_dma_pci_tbl,
.probe = plx_dma_probe,
.remove = plx_dma_remove,
};
module_pci_driver(plx_dma_pci_driver);
| linux-master | drivers/dma/plx_dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* DMA Router driver for LPC18xx/43xx DMA MUX
*
* Copyright (C) 2015 Joachim Eastwood <[email protected]>
*
* Based on TI DMA Crossbar driver by:
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
* Author: Peter Ujfalusi <[email protected]>
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/spinlock.h>
/* CREG register offset and macros for mux manipulation */
#define LPC18XX_CREG_DMAMUX 0x11c
#define LPC18XX_DMAMUX_VAL(v, n) ((v) << (n * 2))
#define LPC18XX_DMAMUX_MASK(n) (0x3 << (n * 2))
#define LPC18XX_DMAMUX_MAX_VAL 0x3
struct lpc18xx_dmamux {
u32 value;
bool busy;
};
struct lpc18xx_dmamux_data {
struct dma_router dmarouter;
struct lpc18xx_dmamux *muxes;
u32 dma_master_requests;
u32 dma_mux_requests;
struct regmap *reg;
spinlock_t lock;
};
static void lpc18xx_dmamux_free(struct device *dev, void *route_data)
{
struct lpc18xx_dmamux_data *dmamux = dev_get_drvdata(dev);
struct lpc18xx_dmamux *mux = route_data;
unsigned long flags;
spin_lock_irqsave(&dmamux->lock, flags);
mux->busy = false;
spin_unlock_irqrestore(&dmamux->lock, flags);
}
static void *lpc18xx_dmamux_reserve(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
struct lpc18xx_dmamux_data *dmamux = platform_get_drvdata(pdev);
unsigned long flags;
unsigned mux;
if (dma_spec->args_count != 3) {
dev_err(&pdev->dev, "invalid number of dma mux args\n");
return ERR_PTR(-EINVAL);
}
mux = dma_spec->args[0];
if (mux >= dmamux->dma_master_requests) {
dev_err(&pdev->dev, "invalid mux number: %d\n",
dma_spec->args[0]);
return ERR_PTR(-EINVAL);
}
if (dma_spec->args[1] > LPC18XX_DMAMUX_MAX_VAL) {
dev_err(&pdev->dev, "invalid dma mux value: %d\n",
dma_spec->args[1]);
return ERR_PTR(-EINVAL);
}
/* The of_node_put() will be done in the core for the node */
dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
if (!dma_spec->np) {
dev_err(&pdev->dev, "can't get dma master\n");
return ERR_PTR(-EINVAL);
}
spin_lock_irqsave(&dmamux->lock, flags);
if (dmamux->muxes[mux].busy) {
spin_unlock_irqrestore(&dmamux->lock, flags);
dev_err(&pdev->dev, "dma request %u busy with %u.%u\n",
mux, mux, dmamux->muxes[mux].value);
of_node_put(dma_spec->np);
return ERR_PTR(-EBUSY);
}
dmamux->muxes[mux].busy = true;
dmamux->muxes[mux].value = dma_spec->args[1];
regmap_update_bits(dmamux->reg, LPC18XX_CREG_DMAMUX,
LPC18XX_DMAMUX_MASK(mux),
LPC18XX_DMAMUX_VAL(dmamux->muxes[mux].value, mux));
spin_unlock_irqrestore(&dmamux->lock, flags);
dma_spec->args[1] = dma_spec->args[2];
dma_spec->args_count = 2;
dev_dbg(&pdev->dev, "mapping dmamux %u.%u to dma request %u\n", mux,
dmamux->muxes[mux].value, mux);
return &dmamux->muxes[mux];
}
static int lpc18xx_dmamux_probe(struct platform_device *pdev)
{
struct device_node *dma_np, *np = pdev->dev.of_node;
struct lpc18xx_dmamux_data *dmamux;
int ret;
dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL);
if (!dmamux)
return -ENOMEM;
dmamux->reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
if (IS_ERR(dmamux->reg)) {
dev_err(&pdev->dev, "syscon lookup failed\n");
return PTR_ERR(dmamux->reg);
}
ret = of_property_read_u32(np, "dma-requests",
&dmamux->dma_mux_requests);
if (ret) {
dev_err(&pdev->dev, "missing dma-requests property\n");
return ret;
}
dma_np = of_parse_phandle(np, "dma-masters", 0);
if (!dma_np) {
dev_err(&pdev->dev, "can't get dma master\n");
return -ENODEV;
}
ret = of_property_read_u32(dma_np, "dma-requests",
&dmamux->dma_master_requests);
of_node_put(dma_np);
if (ret) {
dev_err(&pdev->dev, "missing master dma-requests property\n");
return ret;
}
dmamux->muxes = devm_kcalloc(&pdev->dev, dmamux->dma_master_requests,
sizeof(struct lpc18xx_dmamux),
GFP_KERNEL);
if (!dmamux->muxes)
return -ENOMEM;
spin_lock_init(&dmamux->lock);
platform_set_drvdata(pdev, dmamux);
dmamux->dmarouter.dev = &pdev->dev;
dmamux->dmarouter.route_free = lpc18xx_dmamux_free;
return of_dma_router_register(np, lpc18xx_dmamux_reserve,
&dmamux->dmarouter);
}
static const struct of_device_id lpc18xx_dmamux_match[] = {
{ .compatible = "nxp,lpc1850-dmamux" },
{},
};
static struct platform_driver lpc18xx_dmamux_driver = {
.probe = lpc18xx_dmamux_probe,
.driver = {
.name = "lpc18xx-dmamux",
.of_match_table = lpc18xx_dmamux_match,
},
};
static int __init lpc18xx_dmamux_init(void)
{
return platform_driver_register(&lpc18xx_dmamux_driver);
}
arch_initcall(lpc18xx_dmamux_init);
| linux-master | drivers/dma/lpc18xx-dmamux.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Virtual DMA channel support for DMAengine
*
* Copyright (C) 2012 Russell King
*/
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include "virt-dma.h"
static struct virt_dma_desc *to_virt_desc(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct virt_dma_desc, tx);
}
dma_cookie_t vchan_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct virt_dma_chan *vc = to_virt_chan(tx->chan);
struct virt_dma_desc *vd = to_virt_desc(tx);
unsigned long flags;
dma_cookie_t cookie;
spin_lock_irqsave(&vc->lock, flags);
cookie = dma_cookie_assign(tx);
list_move_tail(&vd->node, &vc->desc_submitted);
spin_unlock_irqrestore(&vc->lock, flags);
dev_dbg(vc->chan.device->dev, "vchan %p: txd %p[%x]: submitted\n",
vc, vd, cookie);
return cookie;
}
EXPORT_SYMBOL_GPL(vchan_tx_submit);
/**
* vchan_tx_desc_free - free a reusable descriptor
* @tx: the transfer
*
* This function frees a previously allocated reusable descriptor. The only
* other way is to clear the DMA_CTRL_REUSE flag and submit one last time the
* transfer.
*
* Returns 0 upon success
*/
int vchan_tx_desc_free(struct dma_async_tx_descriptor *tx)
{
struct virt_dma_chan *vc = to_virt_chan(tx->chan);
struct virt_dma_desc *vd = to_virt_desc(tx);
unsigned long flags;
spin_lock_irqsave(&vc->lock, flags);
list_del(&vd->node);
spin_unlock_irqrestore(&vc->lock, flags);
dev_dbg(vc->chan.device->dev, "vchan %p: txd %p[%x]: freeing\n",
vc, vd, vd->tx.cookie);
vc->desc_free(vd);
return 0;
}
EXPORT_SYMBOL_GPL(vchan_tx_desc_free);
struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *vc,
dma_cookie_t cookie)
{
struct virt_dma_desc *vd;
list_for_each_entry(vd, &vc->desc_issued, node)
if (vd->tx.cookie == cookie)
return vd;
return NULL;
}
EXPORT_SYMBOL_GPL(vchan_find_desc);
/*
* This tasklet handles the completion of a DMA descriptor by
* calling its callback and freeing it.
*/
static void vchan_complete(struct tasklet_struct *t)
{
struct virt_dma_chan *vc = from_tasklet(vc, t, task);
struct virt_dma_desc *vd, *_vd;
struct dmaengine_desc_callback cb;
LIST_HEAD(head);
spin_lock_irq(&vc->lock);
list_splice_tail_init(&vc->desc_completed, &head);
vd = vc->cyclic;
if (vd) {
vc->cyclic = NULL;
dmaengine_desc_get_callback(&vd->tx, &cb);
} else {
memset(&cb, 0, sizeof(cb));
}
spin_unlock_irq(&vc->lock);
dmaengine_desc_callback_invoke(&cb, &vd->tx_result);
list_for_each_entry_safe(vd, _vd, &head, node) {
dmaengine_desc_get_callback(&vd->tx, &cb);
list_del(&vd->node);
dmaengine_desc_callback_invoke(&cb, &vd->tx_result);
vchan_vdesc_fini(vd);
}
}
void vchan_dma_desc_free_list(struct virt_dma_chan *vc, struct list_head *head)
{
struct virt_dma_desc *vd, *_vd;
list_for_each_entry_safe(vd, _vd, head, node) {
list_del(&vd->node);
vchan_vdesc_fini(vd);
}
}
EXPORT_SYMBOL_GPL(vchan_dma_desc_free_list);
void vchan_init(struct virt_dma_chan *vc, struct dma_device *dmadev)
{
dma_cookie_init(&vc->chan);
spin_lock_init(&vc->lock);
INIT_LIST_HEAD(&vc->desc_allocated);
INIT_LIST_HEAD(&vc->desc_submitted);
INIT_LIST_HEAD(&vc->desc_issued);
INIT_LIST_HEAD(&vc->desc_completed);
INIT_LIST_HEAD(&vc->desc_terminated);
tasklet_setup(&vc->task, vchan_complete);
vc->chan.device = dmadev;
list_add_tail(&vc->chan.device_node, &dmadev->channels);
}
EXPORT_SYMBOL_GPL(vchan_init);
MODULE_AUTHOR("Russell King");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/virt-dma.c |
// SPDX-License-Identifier: GPL-2.0+
//
// Actions Semi Owl SoCs DMA driver
//
// Copyright (c) 2014 Actions Semi Inc.
// Author: David Liu <[email protected]>
//
// Copyright (c) 2018 Linaro Ltd.
// Author: Manivannan Sadhasivam <[email protected]>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "virt-dma.h"
#define OWL_DMA_FRAME_MAX_LENGTH 0xfffff
/* Global DMA Controller Registers */
#define OWL_DMA_IRQ_PD0 0x00
#define OWL_DMA_IRQ_PD1 0x04
#define OWL_DMA_IRQ_PD2 0x08
#define OWL_DMA_IRQ_PD3 0x0C
#define OWL_DMA_IRQ_EN0 0x10
#define OWL_DMA_IRQ_EN1 0x14
#define OWL_DMA_IRQ_EN2 0x18
#define OWL_DMA_IRQ_EN3 0x1C
#define OWL_DMA_SECURE_ACCESS_CTL 0x20
#define OWL_DMA_NIC_QOS 0x24
#define OWL_DMA_DBGSEL 0x28
#define OWL_DMA_IDLE_STAT 0x2C
/* Channel Registers */
#define OWL_DMA_CHAN_BASE(i) (0x100 + (i) * 0x100)
#define OWL_DMAX_MODE 0x00
#define OWL_DMAX_SOURCE 0x04
#define OWL_DMAX_DESTINATION 0x08
#define OWL_DMAX_FRAME_LEN 0x0C
#define OWL_DMAX_FRAME_CNT 0x10
#define OWL_DMAX_REMAIN_FRAME_CNT 0x14
#define OWL_DMAX_REMAIN_CNT 0x18
#define OWL_DMAX_SOURCE_STRIDE 0x1C
#define OWL_DMAX_DESTINATION_STRIDE 0x20
#define OWL_DMAX_START 0x24
#define OWL_DMAX_PAUSE 0x28
#define OWL_DMAX_CHAINED_CTL 0x2C
#define OWL_DMAX_CONSTANT 0x30
#define OWL_DMAX_LINKLIST_CTL 0x34
#define OWL_DMAX_NEXT_DESCRIPTOR 0x38
#define OWL_DMAX_CURRENT_DESCRIPTOR_NUM 0x3C
#define OWL_DMAX_INT_CTL 0x40
#define OWL_DMAX_INT_STATUS 0x44
#define OWL_DMAX_CURRENT_SOURCE_POINTER 0x48
#define OWL_DMAX_CURRENT_DESTINATION_POINTER 0x4C
/* OWL_DMAX_MODE Bits */
#define OWL_DMA_MODE_TS(x) (((x) & GENMASK(5, 0)) << 0)
#define OWL_DMA_MODE_ST(x) (((x) & GENMASK(1, 0)) << 8)
#define OWL_DMA_MODE_ST_DEV OWL_DMA_MODE_ST(0)
#define OWL_DMA_MODE_ST_DCU OWL_DMA_MODE_ST(2)
#define OWL_DMA_MODE_ST_SRAM OWL_DMA_MODE_ST(3)
#define OWL_DMA_MODE_DT(x) (((x) & GENMASK(1, 0)) << 10)
#define OWL_DMA_MODE_DT_DEV OWL_DMA_MODE_DT(0)
#define OWL_DMA_MODE_DT_DCU OWL_DMA_MODE_DT(2)
#define OWL_DMA_MODE_DT_SRAM OWL_DMA_MODE_DT(3)
#define OWL_DMA_MODE_SAM(x) (((x) & GENMASK(1, 0)) << 16)
#define OWL_DMA_MODE_SAM_CONST OWL_DMA_MODE_SAM(0)
#define OWL_DMA_MODE_SAM_INC OWL_DMA_MODE_SAM(1)
#define OWL_DMA_MODE_SAM_STRIDE OWL_DMA_MODE_SAM(2)
#define OWL_DMA_MODE_DAM(x) (((x) & GENMASK(1, 0)) << 18)
#define OWL_DMA_MODE_DAM_CONST OWL_DMA_MODE_DAM(0)
#define OWL_DMA_MODE_DAM_INC OWL_DMA_MODE_DAM(1)
#define OWL_DMA_MODE_DAM_STRIDE OWL_DMA_MODE_DAM(2)
#define OWL_DMA_MODE_PW(x) (((x) & GENMASK(2, 0)) << 20)
#define OWL_DMA_MODE_CB BIT(23)
#define OWL_DMA_MODE_NDDBW(x) (((x) & 0x1) << 28)
#define OWL_DMA_MODE_NDDBW_32BIT OWL_DMA_MODE_NDDBW(0)
#define OWL_DMA_MODE_NDDBW_8BIT OWL_DMA_MODE_NDDBW(1)
#define OWL_DMA_MODE_CFE BIT(29)
#define OWL_DMA_MODE_LME BIT(30)
#define OWL_DMA_MODE_CME BIT(31)
/* OWL_DMAX_LINKLIST_CTL Bits */
#define OWL_DMA_LLC_SAV(x) (((x) & GENMASK(1, 0)) << 8)
#define OWL_DMA_LLC_SAV_INC OWL_DMA_LLC_SAV(0)
#define OWL_DMA_LLC_SAV_LOAD_NEXT OWL_DMA_LLC_SAV(1)
#define OWL_DMA_LLC_SAV_LOAD_PREV OWL_DMA_LLC_SAV(2)
#define OWL_DMA_LLC_DAV(x) (((x) & GENMASK(1, 0)) << 10)
#define OWL_DMA_LLC_DAV_INC OWL_DMA_LLC_DAV(0)
#define OWL_DMA_LLC_DAV_LOAD_NEXT OWL_DMA_LLC_DAV(1)
#define OWL_DMA_LLC_DAV_LOAD_PREV OWL_DMA_LLC_DAV(2)
#define OWL_DMA_LLC_SUSPEND BIT(16)
/* OWL_DMAX_INT_CTL Bits */
#define OWL_DMA_INTCTL_BLOCK BIT(0)
#define OWL_DMA_INTCTL_SUPER_BLOCK BIT(1)
#define OWL_DMA_INTCTL_FRAME BIT(2)
#define OWL_DMA_INTCTL_HALF_FRAME BIT(3)
#define OWL_DMA_INTCTL_LAST_FRAME BIT(4)
/* OWL_DMAX_INT_STATUS Bits */
#define OWL_DMA_INTSTAT_BLOCK BIT(0)
#define OWL_DMA_INTSTAT_SUPER_BLOCK BIT(1)
#define OWL_DMA_INTSTAT_FRAME BIT(2)
#define OWL_DMA_INTSTAT_HALF_FRAME BIT(3)
#define OWL_DMA_INTSTAT_LAST_FRAME BIT(4)
/* Pack shift and newshift in a single word */
#define BIT_FIELD(val, width, shift, newshift) \
((((val) >> (shift)) & ((BIT(width)) - 1)) << (newshift))
/* Frame count value is fixed as 1 */
#define FCNT_VAL 0x1
/**
* enum owl_dmadesc_offsets - Describe DMA descriptor, hardware link
* list for dma transfer
* @OWL_DMADESC_NEXT_LLI: physical address of the next link list
* @OWL_DMADESC_SADDR: source physical address
* @OWL_DMADESC_DADDR: destination physical address
* @OWL_DMADESC_FLEN: frame length
* @OWL_DMADESC_SRC_STRIDE: source stride
* @OWL_DMADESC_DST_STRIDE: destination stride
* @OWL_DMADESC_CTRLA: dma_mode and linklist ctrl config
* @OWL_DMADESC_CTRLB: interrupt config
* @OWL_DMADESC_CONST_NUM: data for constant fill
* @OWL_DMADESC_SIZE: max size of this enum
*/
enum owl_dmadesc_offsets {
OWL_DMADESC_NEXT_LLI = 0,
OWL_DMADESC_SADDR,
OWL_DMADESC_DADDR,
OWL_DMADESC_FLEN,
OWL_DMADESC_SRC_STRIDE,
OWL_DMADESC_DST_STRIDE,
OWL_DMADESC_CTRLA,
OWL_DMADESC_CTRLB,
OWL_DMADESC_CONST_NUM,
OWL_DMADESC_SIZE
};
enum owl_dma_id {
S900_DMA,
S700_DMA,
};
/**
* struct owl_dma_lli - Link list for dma transfer
* @hw: hardware link list
* @phys: physical address of hardware link list
* @node: node for txd's lli_list
*/
struct owl_dma_lli {
u32 hw[OWL_DMADESC_SIZE];
dma_addr_t phys;
struct list_head node;
};
/**
* struct owl_dma_txd - Wrapper for struct dma_async_tx_descriptor
* @vd: virtual DMA descriptor
* @lli_list: link list of lli nodes
* @cyclic: flag to indicate cyclic transfers
*/
struct owl_dma_txd {
struct virt_dma_desc vd;
struct list_head lli_list;
bool cyclic;
};
/**
* struct owl_dma_pchan - Holder for the physical channels
* @id: physical index to this channel
* @base: virtual memory base for the dma channel
* @vchan: the virtual channel currently being served by this physical channel
*/
struct owl_dma_pchan {
u32 id;
void __iomem *base;
struct owl_dma_vchan *vchan;
};
/**
* struct owl_dma_vchan - Wrapper for DMA ENGINE channel
* @vc: wrapped virtual channel
* @pchan: the physical channel utilized by this channel
* @txd: active transaction on this channel
* @cfg: slave configuration for this channel
* @drq: physical DMA request ID for this channel
*/
struct owl_dma_vchan {
struct virt_dma_chan vc;
struct owl_dma_pchan *pchan;
struct owl_dma_txd *txd;
struct dma_slave_config cfg;
u8 drq;
};
/**
* struct owl_dma - Holder for the Owl DMA controller
* @dma: dma engine for this instance
* @base: virtual memory base for the DMA controller
* @clk: clock for the DMA controller
* @lock: a lock to use when change DMA controller global register
* @lli_pool: a pool for the LLI descriptors
* @irq: interrupt ID for the DMA controller
* @nr_pchans: the number of physical channels
* @pchans: array of data for the physical channels
* @nr_vchans: the number of physical channels
* @vchans: array of data for the physical channels
* @devid: device id based on OWL SoC
*/
struct owl_dma {
struct dma_device dma;
void __iomem *base;
struct clk *clk;
spinlock_t lock;
struct dma_pool *lli_pool;
int irq;
unsigned int nr_pchans;
struct owl_dma_pchan *pchans;
unsigned int nr_vchans;
struct owl_dma_vchan *vchans;
enum owl_dma_id devid;
};
static void pchan_update(struct owl_dma_pchan *pchan, u32 reg,
u32 val, bool state)
{
u32 regval;
regval = readl(pchan->base + reg);
if (state)
regval |= val;
else
regval &= ~val;
writel(val, pchan->base + reg);
}
static void pchan_writel(struct owl_dma_pchan *pchan, u32 reg, u32 data)
{
writel(data, pchan->base + reg);
}
static u32 pchan_readl(struct owl_dma_pchan *pchan, u32 reg)
{
return readl(pchan->base + reg);
}
static void dma_update(struct owl_dma *od, u32 reg, u32 val, bool state)
{
u32 regval;
regval = readl(od->base + reg);
if (state)
regval |= val;
else
regval &= ~val;
writel(val, od->base + reg);
}
static void dma_writel(struct owl_dma *od, u32 reg, u32 data)
{
writel(data, od->base + reg);
}
static u32 dma_readl(struct owl_dma *od, u32 reg)
{
return readl(od->base + reg);
}
static inline struct owl_dma *to_owl_dma(struct dma_device *dd)
{
return container_of(dd, struct owl_dma, dma);
}
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static inline struct owl_dma_vchan *to_owl_vchan(struct dma_chan *chan)
{
return container_of(chan, struct owl_dma_vchan, vc.chan);
}
static inline struct owl_dma_txd *to_owl_txd(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct owl_dma_txd, vd.tx);
}
static inline u32 llc_hw_ctrla(u32 mode, u32 llc_ctl)
{
u32 ctl;
ctl = BIT_FIELD(mode, 4, 28, 28) |
BIT_FIELD(mode, 8, 16, 20) |
BIT_FIELD(mode, 4, 8, 16) |
BIT_FIELD(mode, 6, 0, 10) |
BIT_FIELD(llc_ctl, 2, 10, 8) |
BIT_FIELD(llc_ctl, 2, 8, 6);
return ctl;
}
static inline u32 llc_hw_ctrlb(u32 int_ctl)
{
u32 ctl;
/*
* Irrespective of the SoC, ctrlb value starts filling from
* bit 18.
*/
ctl = BIT_FIELD(int_ctl, 7, 0, 18);
return ctl;
}
static u32 llc_hw_flen(struct owl_dma_lli *lli)
{
return lli->hw[OWL_DMADESC_FLEN] & GENMASK(19, 0);
}
static void owl_dma_free_lli(struct owl_dma *od,
struct owl_dma_lli *lli)
{
list_del(&lli->node);
dma_pool_free(od->lli_pool, lli, lli->phys);
}
static struct owl_dma_lli *owl_dma_alloc_lli(struct owl_dma *od)
{
struct owl_dma_lli *lli;
dma_addr_t phys;
lli = dma_pool_alloc(od->lli_pool, GFP_NOWAIT, &phys);
if (!lli)
return NULL;
INIT_LIST_HEAD(&lli->node);
lli->phys = phys;
return lli;
}
static struct owl_dma_lli *owl_dma_add_lli(struct owl_dma_txd *txd,
struct owl_dma_lli *prev,
struct owl_dma_lli *next,
bool is_cyclic)
{
if (!is_cyclic)
list_add_tail(&next->node, &txd->lli_list);
if (prev) {
prev->hw[OWL_DMADESC_NEXT_LLI] = next->phys;
prev->hw[OWL_DMADESC_CTRLA] |=
llc_hw_ctrla(OWL_DMA_MODE_LME, 0);
}
return next;
}
static inline int owl_dma_cfg_lli(struct owl_dma_vchan *vchan,
struct owl_dma_lli *lli,
dma_addr_t src, dma_addr_t dst,
u32 len, enum dma_transfer_direction dir,
struct dma_slave_config *sconfig,
bool is_cyclic)
{
struct owl_dma *od = to_owl_dma(vchan->vc.chan.device);
u32 mode, ctrlb;
mode = OWL_DMA_MODE_PW(0);
switch (dir) {
case DMA_MEM_TO_MEM:
mode |= OWL_DMA_MODE_TS(0) | OWL_DMA_MODE_ST_DCU |
OWL_DMA_MODE_DT_DCU | OWL_DMA_MODE_SAM_INC |
OWL_DMA_MODE_DAM_INC;
break;
case DMA_MEM_TO_DEV:
mode |= OWL_DMA_MODE_TS(vchan->drq)
| OWL_DMA_MODE_ST_DCU | OWL_DMA_MODE_DT_DEV
| OWL_DMA_MODE_SAM_INC | OWL_DMA_MODE_DAM_CONST;
/*
* Hardware only supports 32bit and 8bit buswidth. Since the
* default is 32bit, select 8bit only when requested.
*/
if (sconfig->dst_addr_width == DMA_SLAVE_BUSWIDTH_1_BYTE)
mode |= OWL_DMA_MODE_NDDBW_8BIT;
break;
case DMA_DEV_TO_MEM:
mode |= OWL_DMA_MODE_TS(vchan->drq)
| OWL_DMA_MODE_ST_DEV | OWL_DMA_MODE_DT_DCU
| OWL_DMA_MODE_SAM_CONST | OWL_DMA_MODE_DAM_INC;
/*
* Hardware only supports 32bit and 8bit buswidth. Since the
* default is 32bit, select 8bit only when requested.
*/
if (sconfig->src_addr_width == DMA_SLAVE_BUSWIDTH_1_BYTE)
mode |= OWL_DMA_MODE_NDDBW_8BIT;
break;
default:
return -EINVAL;
}
lli->hw[OWL_DMADESC_CTRLA] = llc_hw_ctrla(mode,
OWL_DMA_LLC_SAV_LOAD_NEXT |
OWL_DMA_LLC_DAV_LOAD_NEXT);
if (is_cyclic)
ctrlb = llc_hw_ctrlb(OWL_DMA_INTCTL_BLOCK);
else
ctrlb = llc_hw_ctrlb(OWL_DMA_INTCTL_SUPER_BLOCK);
lli->hw[OWL_DMADESC_NEXT_LLI] = 0; /* One link list by default */
lli->hw[OWL_DMADESC_SADDR] = src;
lli->hw[OWL_DMADESC_DADDR] = dst;
lli->hw[OWL_DMADESC_SRC_STRIDE] = 0;
lli->hw[OWL_DMADESC_DST_STRIDE] = 0;
if (od->devid == S700_DMA) {
/* Max frame length is 1MB */
lli->hw[OWL_DMADESC_FLEN] = len;
/*
* On S700, word starts from offset 0x1C is shared between
* frame count and ctrlb, where first 12 bits are for frame
* count and rest of 20 bits are for ctrlb.
*/
lli->hw[OWL_DMADESC_CTRLB] = FCNT_VAL | ctrlb;
} else {
/*
* On S900, word starts from offset 0xC is shared between
* frame length (max frame length is 1MB) and frame count,
* where first 20 bits are for frame length and rest of
* 12 bits are for frame count.
*/
lli->hw[OWL_DMADESC_FLEN] = len | FCNT_VAL << 20;
lli->hw[OWL_DMADESC_CTRLB] = ctrlb;
}
return 0;
}
static struct owl_dma_pchan *owl_dma_get_pchan(struct owl_dma *od,
struct owl_dma_vchan *vchan)
{
struct owl_dma_pchan *pchan = NULL;
unsigned long flags;
int i;
for (i = 0; i < od->nr_pchans; i++) {
pchan = &od->pchans[i];
spin_lock_irqsave(&od->lock, flags);
if (!pchan->vchan) {
pchan->vchan = vchan;
spin_unlock_irqrestore(&od->lock, flags);
break;
}
spin_unlock_irqrestore(&od->lock, flags);
}
return pchan;
}
static int owl_dma_pchan_busy(struct owl_dma *od, struct owl_dma_pchan *pchan)
{
unsigned int val;
val = dma_readl(od, OWL_DMA_IDLE_STAT);
return !(val & (1 << pchan->id));
}
static void owl_dma_terminate_pchan(struct owl_dma *od,
struct owl_dma_pchan *pchan)
{
unsigned long flags;
u32 irq_pd;
pchan_writel(pchan, OWL_DMAX_START, 0);
pchan_update(pchan, OWL_DMAX_INT_STATUS, 0xff, false);
spin_lock_irqsave(&od->lock, flags);
dma_update(od, OWL_DMA_IRQ_EN0, (1 << pchan->id), false);
irq_pd = dma_readl(od, OWL_DMA_IRQ_PD0);
if (irq_pd & (1 << pchan->id)) {
dev_warn(od->dma.dev,
"terminating pchan %d that still has pending irq\n",
pchan->id);
dma_writel(od, OWL_DMA_IRQ_PD0, (1 << pchan->id));
}
pchan->vchan = NULL;
spin_unlock_irqrestore(&od->lock, flags);
}
static void owl_dma_pause_pchan(struct owl_dma_pchan *pchan)
{
pchan_writel(pchan, 1, OWL_DMAX_PAUSE);
}
static void owl_dma_resume_pchan(struct owl_dma_pchan *pchan)
{
pchan_writel(pchan, 0, OWL_DMAX_PAUSE);
}
static int owl_dma_start_next_txd(struct owl_dma_vchan *vchan)
{
struct owl_dma *od = to_owl_dma(vchan->vc.chan.device);
struct virt_dma_desc *vd = vchan_next_desc(&vchan->vc);
struct owl_dma_pchan *pchan = vchan->pchan;
struct owl_dma_txd *txd = to_owl_txd(&vd->tx);
struct owl_dma_lli *lli;
unsigned long flags;
u32 int_ctl;
list_del(&vd->node);
vchan->txd = txd;
/* Wait for channel inactive */
while (owl_dma_pchan_busy(od, pchan))
cpu_relax();
lli = list_first_entry(&txd->lli_list,
struct owl_dma_lli, node);
if (txd->cyclic)
int_ctl = OWL_DMA_INTCTL_BLOCK;
else
int_ctl = OWL_DMA_INTCTL_SUPER_BLOCK;
pchan_writel(pchan, OWL_DMAX_MODE, OWL_DMA_MODE_LME);
pchan_writel(pchan, OWL_DMAX_LINKLIST_CTL,
OWL_DMA_LLC_SAV_LOAD_NEXT | OWL_DMA_LLC_DAV_LOAD_NEXT);
pchan_writel(pchan, OWL_DMAX_NEXT_DESCRIPTOR, lli->phys);
pchan_writel(pchan, OWL_DMAX_INT_CTL, int_ctl);
/* Clear IRQ status for this pchan */
pchan_update(pchan, OWL_DMAX_INT_STATUS, 0xff, false);
spin_lock_irqsave(&od->lock, flags);
dma_update(od, OWL_DMA_IRQ_EN0, (1 << pchan->id), true);
spin_unlock_irqrestore(&od->lock, flags);
dev_dbg(chan2dev(&vchan->vc.chan), "starting pchan %d\n", pchan->id);
/* Start DMA transfer for this pchan */
pchan_writel(pchan, OWL_DMAX_START, 0x1);
return 0;
}
static void owl_dma_phy_free(struct owl_dma *od, struct owl_dma_vchan *vchan)
{
/* Ensure that the physical channel is stopped */
owl_dma_terminate_pchan(od, vchan->pchan);
vchan->pchan = NULL;
}
static irqreturn_t owl_dma_interrupt(int irq, void *dev_id)
{
struct owl_dma *od = dev_id;
struct owl_dma_vchan *vchan;
struct owl_dma_pchan *pchan;
unsigned long pending;
int i;
unsigned int global_irq_pending, chan_irq_pending;
spin_lock(&od->lock);
pending = dma_readl(od, OWL_DMA_IRQ_PD0);
/* Clear IRQ status for each pchan */
for_each_set_bit(i, &pending, od->nr_pchans) {
pchan = &od->pchans[i];
pchan_update(pchan, OWL_DMAX_INT_STATUS, 0xff, false);
}
/* Clear pending IRQ */
dma_writel(od, OWL_DMA_IRQ_PD0, pending);
/* Check missed pending IRQ */
for (i = 0; i < od->nr_pchans; i++) {
pchan = &od->pchans[i];
chan_irq_pending = pchan_readl(pchan, OWL_DMAX_INT_CTL) &
pchan_readl(pchan, OWL_DMAX_INT_STATUS);
/* Dummy read to ensure OWL_DMA_IRQ_PD0 value is updated */
dma_readl(od, OWL_DMA_IRQ_PD0);
global_irq_pending = dma_readl(od, OWL_DMA_IRQ_PD0);
if (chan_irq_pending && !(global_irq_pending & BIT(i))) {
dev_dbg(od->dma.dev,
"global and channel IRQ pending match err\n");
/* Clear IRQ status for this pchan */
pchan_update(pchan, OWL_DMAX_INT_STATUS,
0xff, false);
/* Update global IRQ pending */
pending |= BIT(i);
}
}
spin_unlock(&od->lock);
for_each_set_bit(i, &pending, od->nr_pchans) {
struct owl_dma_txd *txd;
pchan = &od->pchans[i];
vchan = pchan->vchan;
if (!vchan) {
dev_warn(od->dma.dev, "no vchan attached on pchan %d\n",
pchan->id);
continue;
}
spin_lock(&vchan->vc.lock);
txd = vchan->txd;
if (txd) {
vchan->txd = NULL;
vchan_cookie_complete(&txd->vd);
/*
* Start the next descriptor (if any),
* otherwise free this channel.
*/
if (vchan_next_desc(&vchan->vc))
owl_dma_start_next_txd(vchan);
else
owl_dma_phy_free(od, vchan);
}
spin_unlock(&vchan->vc.lock);
}
return IRQ_HANDLED;
}
static void owl_dma_free_txd(struct owl_dma *od, struct owl_dma_txd *txd)
{
struct owl_dma_lli *lli, *_lli;
if (unlikely(!txd))
return;
list_for_each_entry_safe(lli, _lli, &txd->lli_list, node)
owl_dma_free_lli(od, lli);
kfree(txd);
}
static void owl_dma_desc_free(struct virt_dma_desc *vd)
{
struct owl_dma *od = to_owl_dma(vd->tx.chan->device);
struct owl_dma_txd *txd = to_owl_txd(&vd->tx);
owl_dma_free_txd(od, txd);
}
static int owl_dma_terminate_all(struct dma_chan *chan)
{
struct owl_dma *od = to_owl_dma(chan->device);
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&vchan->vc.lock, flags);
if (vchan->pchan)
owl_dma_phy_free(od, vchan);
if (vchan->txd) {
owl_dma_desc_free(&vchan->txd->vd);
vchan->txd = NULL;
}
vchan_get_all_descriptors(&vchan->vc, &head);
spin_unlock_irqrestore(&vchan->vc.lock, flags);
vchan_dma_desc_free_list(&vchan->vc, &head);
return 0;
}
static int owl_dma_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
/* Reject definitely invalid configurations */
if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
return -EINVAL;
memcpy(&vchan->cfg, config, sizeof(struct dma_slave_config));
return 0;
}
static int owl_dma_pause(struct dma_chan *chan)
{
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
unsigned long flags;
spin_lock_irqsave(&vchan->vc.lock, flags);
owl_dma_pause_pchan(vchan->pchan);
spin_unlock_irqrestore(&vchan->vc.lock, flags);
return 0;
}
static int owl_dma_resume(struct dma_chan *chan)
{
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
unsigned long flags;
if (!vchan->pchan && !vchan->txd)
return 0;
dev_dbg(chan2dev(chan), "vchan %p: resume\n", &vchan->vc);
spin_lock_irqsave(&vchan->vc.lock, flags);
owl_dma_resume_pchan(vchan->pchan);
spin_unlock_irqrestore(&vchan->vc.lock, flags);
return 0;
}
static u32 owl_dma_getbytes_chan(struct owl_dma_vchan *vchan)
{
struct owl_dma_pchan *pchan;
struct owl_dma_txd *txd;
struct owl_dma_lli *lli;
unsigned int next_lli_phy;
size_t bytes;
pchan = vchan->pchan;
txd = vchan->txd;
if (!pchan || !txd)
return 0;
/* Get remain count of current node in link list */
bytes = pchan_readl(pchan, OWL_DMAX_REMAIN_CNT);
/* Loop through the preceding nodes to get total remaining bytes */
if (pchan_readl(pchan, OWL_DMAX_MODE) & OWL_DMA_MODE_LME) {
next_lli_phy = pchan_readl(pchan, OWL_DMAX_NEXT_DESCRIPTOR);
list_for_each_entry(lli, &txd->lli_list, node) {
/* Start from the next active node */
if (lli->phys == next_lli_phy) {
list_for_each_entry(lli, &txd->lli_list, node)
bytes += llc_hw_flen(lli);
break;
}
}
}
return bytes;
}
static enum dma_status owl_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *state)
{
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
struct owl_dma_lli *lli;
struct virt_dma_desc *vd;
struct owl_dma_txd *txd;
enum dma_status ret;
unsigned long flags;
size_t bytes = 0;
ret = dma_cookie_status(chan, cookie, state);
if (ret == DMA_COMPLETE || !state)
return ret;
spin_lock_irqsave(&vchan->vc.lock, flags);
vd = vchan_find_desc(&vchan->vc, cookie);
if (vd) {
txd = to_owl_txd(&vd->tx);
list_for_each_entry(lli, &txd->lli_list, node)
bytes += llc_hw_flen(lli);
} else {
bytes = owl_dma_getbytes_chan(vchan);
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
dma_set_residue(state, bytes);
return ret;
}
static void owl_dma_phy_alloc_and_start(struct owl_dma_vchan *vchan)
{
struct owl_dma *od = to_owl_dma(vchan->vc.chan.device);
struct owl_dma_pchan *pchan;
pchan = owl_dma_get_pchan(od, vchan);
if (!pchan)
return;
dev_dbg(od->dma.dev, "allocated pchan %d\n", pchan->id);
vchan->pchan = pchan;
owl_dma_start_next_txd(vchan);
}
static void owl_dma_issue_pending(struct dma_chan *chan)
{
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
unsigned long flags;
spin_lock_irqsave(&vchan->vc.lock, flags);
if (vchan_issue_pending(&vchan->vc)) {
if (!vchan->pchan)
owl_dma_phy_alloc_and_start(vchan);
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
}
static struct dma_async_tx_descriptor
*owl_dma_prep_memcpy(struct dma_chan *chan,
dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct owl_dma *od = to_owl_dma(chan->device);
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
struct owl_dma_txd *txd;
struct owl_dma_lli *lli, *prev = NULL;
size_t offset, bytes;
int ret;
if (!len)
return NULL;
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (!txd)
return NULL;
INIT_LIST_HEAD(&txd->lli_list);
/* Process the transfer as frame by frame */
for (offset = 0; offset < len; offset += bytes) {
lli = owl_dma_alloc_lli(od);
if (!lli) {
dev_warn(chan2dev(chan), "failed to allocate lli\n");
goto err_txd_free;
}
bytes = min_t(size_t, (len - offset), OWL_DMA_FRAME_MAX_LENGTH);
ret = owl_dma_cfg_lli(vchan, lli, src + offset, dst + offset,
bytes, DMA_MEM_TO_MEM,
&vchan->cfg, txd->cyclic);
if (ret) {
dev_warn(chan2dev(chan), "failed to config lli\n");
goto err_txd_free;
}
prev = owl_dma_add_lli(txd, prev, lli, false);
}
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_txd_free:
owl_dma_free_txd(od, txd);
return NULL;
}
static struct dma_async_tx_descriptor
*owl_dma_prep_slave_sg(struct dma_chan *chan,
struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct owl_dma *od = to_owl_dma(chan->device);
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
struct dma_slave_config *sconfig = &vchan->cfg;
struct owl_dma_txd *txd;
struct owl_dma_lli *lli, *prev = NULL;
struct scatterlist *sg;
dma_addr_t addr, src = 0, dst = 0;
size_t len;
int ret, i;
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (!txd)
return NULL;
INIT_LIST_HEAD(&txd->lli_list);
for_each_sg(sgl, sg, sg_len, i) {
addr = sg_dma_address(sg);
len = sg_dma_len(sg);
if (len > OWL_DMA_FRAME_MAX_LENGTH) {
dev_err(od->dma.dev,
"frame length exceeds max supported length");
goto err_txd_free;
}
lli = owl_dma_alloc_lli(od);
if (!lli) {
dev_err(chan2dev(chan), "failed to allocate lli");
goto err_txd_free;
}
if (dir == DMA_MEM_TO_DEV) {
src = addr;
dst = sconfig->dst_addr;
} else {
src = sconfig->src_addr;
dst = addr;
}
ret = owl_dma_cfg_lli(vchan, lli, src, dst, len, dir, sconfig,
txd->cyclic);
if (ret) {
dev_warn(chan2dev(chan), "failed to config lli");
goto err_txd_free;
}
prev = owl_dma_add_lli(txd, prev, lli, false);
}
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_txd_free:
owl_dma_free_txd(od, txd);
return NULL;
}
static struct dma_async_tx_descriptor
*owl_prep_dma_cyclic(struct dma_chan *chan,
dma_addr_t buf_addr, size_t buf_len,
size_t period_len,
enum dma_transfer_direction dir,
unsigned long flags)
{
struct owl_dma *od = to_owl_dma(chan->device);
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
struct dma_slave_config *sconfig = &vchan->cfg;
struct owl_dma_txd *txd;
struct owl_dma_lli *lli, *prev = NULL, *first = NULL;
dma_addr_t src = 0, dst = 0;
unsigned int periods = buf_len / period_len;
int ret, i;
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (!txd)
return NULL;
INIT_LIST_HEAD(&txd->lli_list);
txd->cyclic = true;
for (i = 0; i < periods; i++) {
lli = owl_dma_alloc_lli(od);
if (!lli) {
dev_warn(chan2dev(chan), "failed to allocate lli");
goto err_txd_free;
}
if (dir == DMA_MEM_TO_DEV) {
src = buf_addr + (period_len * i);
dst = sconfig->dst_addr;
} else if (dir == DMA_DEV_TO_MEM) {
src = sconfig->src_addr;
dst = buf_addr + (period_len * i);
}
ret = owl_dma_cfg_lli(vchan, lli, src, dst, period_len,
dir, sconfig, txd->cyclic);
if (ret) {
dev_warn(chan2dev(chan), "failed to config lli");
goto err_txd_free;
}
if (!first)
first = lli;
prev = owl_dma_add_lli(txd, prev, lli, false);
}
/* close the cyclic list */
owl_dma_add_lli(txd, prev, first, true);
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_txd_free:
owl_dma_free_txd(od, txd);
return NULL;
}
static void owl_dma_free_chan_resources(struct dma_chan *chan)
{
struct owl_dma_vchan *vchan = to_owl_vchan(chan);
/* Ensure all queued descriptors are freed */
vchan_free_chan_resources(&vchan->vc);
}
static inline void owl_dma_free(struct owl_dma *od)
{
struct owl_dma_vchan *vchan = NULL;
struct owl_dma_vchan *next;
list_for_each_entry_safe(vchan,
next, &od->dma.channels, vc.chan.device_node) {
list_del(&vchan->vc.chan.device_node);
tasklet_kill(&vchan->vc.task);
}
}
static struct dma_chan *owl_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct owl_dma *od = ofdma->of_dma_data;
struct owl_dma_vchan *vchan;
struct dma_chan *chan;
u8 drq = dma_spec->args[0];
if (drq > od->nr_vchans)
return NULL;
chan = dma_get_any_slave_channel(&od->dma);
if (!chan)
return NULL;
vchan = to_owl_vchan(chan);
vchan->drq = drq;
return chan;
}
static const struct of_device_id owl_dma_match[] = {
{ .compatible = "actions,s500-dma", .data = (void *)S900_DMA,},
{ .compatible = "actions,s700-dma", .data = (void *)S700_DMA,},
{ .compatible = "actions,s900-dma", .data = (void *)S900_DMA,},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, owl_dma_match);
static int owl_dma_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct owl_dma *od;
int ret, i, nr_channels, nr_requests;
od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
if (!od)
return -ENOMEM;
od->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(od->base))
return PTR_ERR(od->base);
ret = of_property_read_u32(np, "dma-channels", &nr_channels);
if (ret) {
dev_err(&pdev->dev, "can't get dma-channels\n");
return ret;
}
ret = of_property_read_u32(np, "dma-requests", &nr_requests);
if (ret) {
dev_err(&pdev->dev, "can't get dma-requests\n");
return ret;
}
dev_info(&pdev->dev, "dma-channels %d, dma-requests %d\n",
nr_channels, nr_requests);
od->devid = (uintptr_t)of_device_get_match_data(&pdev->dev);
od->nr_pchans = nr_channels;
od->nr_vchans = nr_requests;
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
platform_set_drvdata(pdev, od);
spin_lock_init(&od->lock);
dma_cap_set(DMA_MEMCPY, od->dma.cap_mask);
dma_cap_set(DMA_SLAVE, od->dma.cap_mask);
dma_cap_set(DMA_CYCLIC, od->dma.cap_mask);
od->dma.dev = &pdev->dev;
od->dma.device_free_chan_resources = owl_dma_free_chan_resources;
od->dma.device_tx_status = owl_dma_tx_status;
od->dma.device_issue_pending = owl_dma_issue_pending;
od->dma.device_prep_dma_memcpy = owl_dma_prep_memcpy;
od->dma.device_prep_slave_sg = owl_dma_prep_slave_sg;
od->dma.device_prep_dma_cyclic = owl_prep_dma_cyclic;
od->dma.device_config = owl_dma_config;
od->dma.device_pause = owl_dma_pause;
od->dma.device_resume = owl_dma_resume;
od->dma.device_terminate_all = owl_dma_terminate_all;
od->dma.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
od->dma.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
od->dma.directions = BIT(DMA_MEM_TO_MEM);
od->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
INIT_LIST_HEAD(&od->dma.channels);
od->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(od->clk)) {
dev_err(&pdev->dev, "unable to get clock\n");
return PTR_ERR(od->clk);
}
/*
* Eventhough the DMA controller is capable of generating 4
* IRQ's for DMA priority feature, we only use 1 IRQ for
* simplification.
*/
od->irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(&pdev->dev, od->irq, owl_dma_interrupt, 0,
dev_name(&pdev->dev), od);
if (ret) {
dev_err(&pdev->dev, "unable to request IRQ\n");
return ret;
}
/* Init physical channel */
od->pchans = devm_kcalloc(&pdev->dev, od->nr_pchans,
sizeof(struct owl_dma_pchan), GFP_KERNEL);
if (!od->pchans)
return -ENOMEM;
for (i = 0; i < od->nr_pchans; i++) {
struct owl_dma_pchan *pchan = &od->pchans[i];
pchan->id = i;
pchan->base = od->base + OWL_DMA_CHAN_BASE(i);
}
/* Init virtual channel */
od->vchans = devm_kcalloc(&pdev->dev, od->nr_vchans,
sizeof(struct owl_dma_vchan), GFP_KERNEL);
if (!od->vchans)
return -ENOMEM;
for (i = 0; i < od->nr_vchans; i++) {
struct owl_dma_vchan *vchan = &od->vchans[i];
vchan->vc.desc_free = owl_dma_desc_free;
vchan_init(&vchan->vc, &od->dma);
}
/* Create a pool of consistent memory blocks for hardware descriptors */
od->lli_pool = dma_pool_create(dev_name(od->dma.dev), od->dma.dev,
sizeof(struct owl_dma_lli),
__alignof__(struct owl_dma_lli),
0);
if (!od->lli_pool) {
dev_err(&pdev->dev, "unable to allocate DMA descriptor pool\n");
return -ENOMEM;
}
clk_prepare_enable(od->clk);
ret = dma_async_device_register(&od->dma);
if (ret) {
dev_err(&pdev->dev, "failed to register DMA engine device\n");
goto err_pool_free;
}
/* Device-tree DMA controller registration */
ret = of_dma_controller_register(pdev->dev.of_node,
owl_dma_of_xlate, od);
if (ret) {
dev_err(&pdev->dev, "of_dma_controller_register failed\n");
goto err_dma_unregister;
}
return 0;
err_dma_unregister:
dma_async_device_unregister(&od->dma);
err_pool_free:
clk_disable_unprepare(od->clk);
dma_pool_destroy(od->lli_pool);
return ret;
}
static int owl_dma_remove(struct platform_device *pdev)
{
struct owl_dma *od = platform_get_drvdata(pdev);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&od->dma);
/* Mask all interrupts for this execution environment */
dma_writel(od, OWL_DMA_IRQ_EN0, 0x0);
/* Make sure we won't have any further interrupts */
devm_free_irq(od->dma.dev, od->irq, od);
owl_dma_free(od);
clk_disable_unprepare(od->clk);
dma_pool_destroy(od->lli_pool);
return 0;
}
static struct platform_driver owl_dma_driver = {
.probe = owl_dma_probe,
.remove = owl_dma_remove,
.driver = {
.name = "dma-owl",
.of_match_table = of_match_ptr(owl_dma_match),
},
};
static int owl_dma_init(void)
{
return platform_driver_register(&owl_dma_driver);
}
subsys_initcall(owl_dma_init);
static void __exit owl_dma_exit(void)
{
platform_driver_unregister(&owl_dma_driver);
}
module_exit(owl_dma_exit);
MODULE_AUTHOR("David Liu <[email protected]>");
MODULE_AUTHOR("Manivannan Sadhasivam <[email protected]>");
MODULE_DESCRIPTION("Actions Semi Owl SoCs DMA driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/owl-dma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) Freescale Semicondutor, Inc. 2007, 2008.
* Copyright (C) Semihalf 2009
* Copyright (C) Ilya Yanok, Emcraft Systems 2010
* Copyright (C) Alexander Popov, Promcontroller 2014
* Copyright (C) Mario Six, Guntermann & Drunck GmbH, 2016
*
* Written by Piotr Ziecik <[email protected]>. Hardware description
* (defines, structures and comments) was taken from MPC5121 DMA driver
* written by Hongjun Chen <[email protected]>.
*
* Approved as OSADL project by a majority of OSADL members and funded
* by OSADL membership fees in 2009; for details see www.osadl.org.
*/
/*
* MPC512x and MPC8308 DMA driver. It supports memory to memory data transfers
* (tested using dmatest module) and data transfers between memory and
* peripheral I/O memory by means of slave scatter/gather with these
* limitations:
* - chunked transfers (described by s/g lists with more than one item) are
* refused as long as proper support for scatter/gather is missing
* - transfers on MPC8308 always start from software as this SoC does not have
* external request lines for peripheral flow control
* - memory <-> I/O memory transfer chunks of sizes of 1, 2, 4, 16 (for
* MPC512x), and 32 bytes are supported, and, consequently, source
* addresses and destination addresses must be aligned accordingly;
* furthermore, for MPC512x SoCs, the transfer size must be aligned on
* (chunk size * maxburst)
*/
#include <linux/module.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/random.h>
#include "dmaengine.h"
/* Number of DMA Transfer descriptors allocated per channel */
#define MPC_DMA_DESCRIPTORS 64
/* Macro definitions */
#define MPC_DMA_TCD_OFFSET 0x1000
/*
* Maximum channel counts for individual hardware variants
* and the maximum channel count over all supported controllers,
* used for data structure size
*/
#define MPC8308_DMACHAN_MAX 16
#define MPC512x_DMACHAN_MAX 64
#define MPC_DMA_CHANNELS 64
/* Arbitration mode of group and channel */
#define MPC_DMA_DMACR_EDCG (1 << 31)
#define MPC_DMA_DMACR_ERGA (1 << 3)
#define MPC_DMA_DMACR_ERCA (1 << 2)
/* Error codes */
#define MPC_DMA_DMAES_VLD (1 << 31)
#define MPC_DMA_DMAES_GPE (1 << 15)
#define MPC_DMA_DMAES_CPE (1 << 14)
#define MPC_DMA_DMAES_ERRCHN(err) \
(((err) >> 8) & 0x3f)
#define MPC_DMA_DMAES_SAE (1 << 7)
#define MPC_DMA_DMAES_SOE (1 << 6)
#define MPC_DMA_DMAES_DAE (1 << 5)
#define MPC_DMA_DMAES_DOE (1 << 4)
#define MPC_DMA_DMAES_NCE (1 << 3)
#define MPC_DMA_DMAES_SGE (1 << 2)
#define MPC_DMA_DMAES_SBE (1 << 1)
#define MPC_DMA_DMAES_DBE (1 << 0)
#define MPC_DMA_DMAGPOR_SNOOP_ENABLE (1 << 6)
#define MPC_DMA_TSIZE_1 0x00
#define MPC_DMA_TSIZE_2 0x01
#define MPC_DMA_TSIZE_4 0x02
#define MPC_DMA_TSIZE_16 0x04
#define MPC_DMA_TSIZE_32 0x05
/* MPC5121 DMA engine registers */
struct __attribute__ ((__packed__)) mpc_dma_regs {
/* 0x00 */
u32 dmacr; /* DMA control register */
u32 dmaes; /* DMA error status */
/* 0x08 */
u32 dmaerqh; /* DMA enable request high(channels 63~32) */
u32 dmaerql; /* DMA enable request low(channels 31~0) */
u32 dmaeeih; /* DMA enable error interrupt high(ch63~32) */
u32 dmaeeil; /* DMA enable error interrupt low(ch31~0) */
/* 0x18 */
u8 dmaserq; /* DMA set enable request */
u8 dmacerq; /* DMA clear enable request */
u8 dmaseei; /* DMA set enable error interrupt */
u8 dmaceei; /* DMA clear enable error interrupt */
/* 0x1c */
u8 dmacint; /* DMA clear interrupt request */
u8 dmacerr; /* DMA clear error */
u8 dmassrt; /* DMA set start bit */
u8 dmacdne; /* DMA clear DONE status bit */
/* 0x20 */
u32 dmainth; /* DMA interrupt request high(ch63~32) */
u32 dmaintl; /* DMA interrupt request low(ch31~0) */
u32 dmaerrh; /* DMA error high(ch63~32) */
u32 dmaerrl; /* DMA error low(ch31~0) */
/* 0x30 */
u32 dmahrsh; /* DMA hw request status high(ch63~32) */
u32 dmahrsl; /* DMA hardware request status low(ch31~0) */
union {
u32 dmaihsa; /* DMA interrupt high select AXE(ch63~32) */
u32 dmagpor; /* (General purpose register on MPC8308) */
};
u32 dmailsa; /* DMA interrupt low select AXE(ch31~0) */
/* 0x40 ~ 0xff */
u32 reserve0[48]; /* Reserved */
/* 0x100 */
u8 dchpri[MPC_DMA_CHANNELS];
/* DMA channels(0~63) priority */
};
struct __attribute__ ((__packed__)) mpc_dma_tcd {
/* 0x00 */
u32 saddr; /* Source address */
u32 smod:5; /* Source address modulo */
u32 ssize:3; /* Source data transfer size */
u32 dmod:5; /* Destination address modulo */
u32 dsize:3; /* Destination data transfer size */
u32 soff:16; /* Signed source address offset */
/* 0x08 */
u32 nbytes; /* Inner "minor" byte count */
u32 slast; /* Last source address adjustment */
u32 daddr; /* Destination address */
/* 0x14 */
u32 citer_elink:1; /* Enable channel-to-channel linking on
* minor loop complete
*/
u32 citer_linkch:6; /* Link channel for minor loop complete */
u32 citer:9; /* Current "major" iteration count */
u32 doff:16; /* Signed destination address offset */
/* 0x18 */
u32 dlast_sga; /* Last Destination address adjustment/scatter
* gather address
*/
/* 0x1c */
u32 biter_elink:1; /* Enable channel-to-channel linking on major
* loop complete
*/
u32 biter_linkch:6;
u32 biter:9; /* Beginning "major" iteration count */
u32 bwc:2; /* Bandwidth control */
u32 major_linkch:6; /* Link channel number */
u32 done:1; /* Channel done */
u32 active:1; /* Channel active */
u32 major_elink:1; /* Enable channel-to-channel linking on major
* loop complete
*/
u32 e_sg:1; /* Enable scatter/gather processing */
u32 d_req:1; /* Disable request */
u32 int_half:1; /* Enable an interrupt when major counter is
* half complete
*/
u32 int_maj:1; /* Enable an interrupt when major iteration
* count completes
*/
u32 start:1; /* Channel start */
};
struct mpc_dma_desc {
struct dma_async_tx_descriptor desc;
struct mpc_dma_tcd *tcd;
dma_addr_t tcd_paddr;
int error;
struct list_head node;
int will_access_peripheral;
};
struct mpc_dma_chan {
struct dma_chan chan;
struct list_head free;
struct list_head prepared;
struct list_head queued;
struct list_head active;
struct list_head completed;
struct mpc_dma_tcd *tcd;
dma_addr_t tcd_paddr;
/* Settings for access to peripheral FIFO */
dma_addr_t src_per_paddr;
u32 src_tcd_nunits;
u8 swidth;
dma_addr_t dst_per_paddr;
u32 dst_tcd_nunits;
u8 dwidth;
/* Lock for this structure */
spinlock_t lock;
};
struct mpc_dma {
struct dma_device dma;
struct tasklet_struct tasklet;
struct mpc_dma_chan channels[MPC_DMA_CHANNELS];
struct mpc_dma_regs __iomem *regs;
struct mpc_dma_tcd __iomem *tcd;
int irq;
int irq2;
uint error_status;
int is_mpc8308;
/* Lock for error_status field in this structure */
spinlock_t error_status_lock;
};
#define DRV_NAME "mpc512x_dma"
/* Convert struct dma_chan to struct mpc_dma_chan */
static inline struct mpc_dma_chan *dma_chan_to_mpc_dma_chan(struct dma_chan *c)
{
return container_of(c, struct mpc_dma_chan, chan);
}
/* Convert struct dma_chan to struct mpc_dma */
static inline struct mpc_dma *dma_chan_to_mpc_dma(struct dma_chan *c)
{
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(c);
return container_of(mchan, struct mpc_dma, channels[c->chan_id]);
}
/*
* Execute all queued DMA descriptors.
*
* Following requirements must be met while calling mpc_dma_execute():
* a) mchan->lock is acquired,
* b) mchan->active list is empty,
* c) mchan->queued list contains at least one entry.
*/
static void mpc_dma_execute(struct mpc_dma_chan *mchan)
{
struct mpc_dma *mdma = dma_chan_to_mpc_dma(&mchan->chan);
struct mpc_dma_desc *first = NULL;
struct mpc_dma_desc *prev = NULL;
struct mpc_dma_desc *mdesc;
int cid = mchan->chan.chan_id;
while (!list_empty(&mchan->queued)) {
mdesc = list_first_entry(&mchan->queued,
struct mpc_dma_desc, node);
/*
* Grab either several mem-to-mem transfer descriptors
* or one peripheral transfer descriptor,
* don't mix mem-to-mem and peripheral transfer descriptors
* within the same 'active' list.
*/
if (mdesc->will_access_peripheral) {
if (list_empty(&mchan->active))
list_move_tail(&mdesc->node, &mchan->active);
break;
} else {
list_move_tail(&mdesc->node, &mchan->active);
}
}
/* Chain descriptors into one transaction */
list_for_each_entry(mdesc, &mchan->active, node) {
if (!first)
first = mdesc;
if (!prev) {
prev = mdesc;
continue;
}
prev->tcd->dlast_sga = mdesc->tcd_paddr;
prev->tcd->e_sg = 1;
mdesc->tcd->start = 1;
prev = mdesc;
}
prev->tcd->int_maj = 1;
/* Send first descriptor in chain into hardware */
memcpy_toio(&mdma->tcd[cid], first->tcd, sizeof(struct mpc_dma_tcd));
if (first != prev)
mdma->tcd[cid].e_sg = 1;
if (mdma->is_mpc8308) {
/* MPC8308, no request lines, software initiated start */
out_8(&mdma->regs->dmassrt, cid);
} else if (first->will_access_peripheral) {
/* Peripherals involved, start by external request signal */
out_8(&mdma->regs->dmaserq, cid);
} else {
/* Memory to memory transfer, software initiated start */
out_8(&mdma->regs->dmassrt, cid);
}
}
/* Handle interrupt on one half of DMA controller (32 channels) */
static void mpc_dma_irq_process(struct mpc_dma *mdma, u32 is, u32 es, int off)
{
struct mpc_dma_chan *mchan;
struct mpc_dma_desc *mdesc;
u32 status = is | es;
int ch;
while ((ch = fls(status) - 1) >= 0) {
status &= ~(1 << ch);
mchan = &mdma->channels[ch + off];
spin_lock(&mchan->lock);
out_8(&mdma->regs->dmacint, ch + off);
out_8(&mdma->regs->dmacerr, ch + off);
/* Check error status */
if (es & (1 << ch))
list_for_each_entry(mdesc, &mchan->active, node)
mdesc->error = -EIO;
/* Execute queued descriptors */
list_splice_tail_init(&mchan->active, &mchan->completed);
if (!list_empty(&mchan->queued))
mpc_dma_execute(mchan);
spin_unlock(&mchan->lock);
}
}
/* Interrupt handler */
static irqreturn_t mpc_dma_irq(int irq, void *data)
{
struct mpc_dma *mdma = data;
uint es;
/* Save error status register */
es = in_be32(&mdma->regs->dmaes);
spin_lock(&mdma->error_status_lock);
if ((es & MPC_DMA_DMAES_VLD) && mdma->error_status == 0)
mdma->error_status = es;
spin_unlock(&mdma->error_status_lock);
/* Handle interrupt on each channel */
if (mdma->dma.chancnt > 32) {
mpc_dma_irq_process(mdma, in_be32(&mdma->regs->dmainth),
in_be32(&mdma->regs->dmaerrh), 32);
}
mpc_dma_irq_process(mdma, in_be32(&mdma->regs->dmaintl),
in_be32(&mdma->regs->dmaerrl), 0);
/* Schedule tasklet */
tasklet_schedule(&mdma->tasklet);
return IRQ_HANDLED;
}
/* process completed descriptors */
static void mpc_dma_process_completed(struct mpc_dma *mdma)
{
dma_cookie_t last_cookie = 0;
struct mpc_dma_chan *mchan;
struct mpc_dma_desc *mdesc;
struct dma_async_tx_descriptor *desc;
unsigned long flags;
LIST_HEAD(list);
int i;
for (i = 0; i < mdma->dma.chancnt; i++) {
mchan = &mdma->channels[i];
/* Get all completed descriptors */
spin_lock_irqsave(&mchan->lock, flags);
if (!list_empty(&mchan->completed))
list_splice_tail_init(&mchan->completed, &list);
spin_unlock_irqrestore(&mchan->lock, flags);
if (list_empty(&list))
continue;
/* Execute callbacks and run dependencies */
list_for_each_entry(mdesc, &list, node) {
desc = &mdesc->desc;
dmaengine_desc_get_callback_invoke(desc, NULL);
last_cookie = desc->cookie;
dma_run_dependencies(desc);
}
/* Free descriptors */
spin_lock_irqsave(&mchan->lock, flags);
list_splice_tail_init(&list, &mchan->free);
mchan->chan.completed_cookie = last_cookie;
spin_unlock_irqrestore(&mchan->lock, flags);
}
}
/* DMA Tasklet */
static void mpc_dma_tasklet(struct tasklet_struct *t)
{
struct mpc_dma *mdma = from_tasklet(mdma, t, tasklet);
unsigned long flags;
uint es;
spin_lock_irqsave(&mdma->error_status_lock, flags);
es = mdma->error_status;
mdma->error_status = 0;
spin_unlock_irqrestore(&mdma->error_status_lock, flags);
/* Print nice error report */
if (es) {
dev_err(mdma->dma.dev,
"Hardware reported following error(s) on channel %u:\n",
MPC_DMA_DMAES_ERRCHN(es));
if (es & MPC_DMA_DMAES_GPE)
dev_err(mdma->dma.dev, "- Group Priority Error\n");
if (es & MPC_DMA_DMAES_CPE)
dev_err(mdma->dma.dev, "- Channel Priority Error\n");
if (es & MPC_DMA_DMAES_SAE)
dev_err(mdma->dma.dev, "- Source Address Error\n");
if (es & MPC_DMA_DMAES_SOE)
dev_err(mdma->dma.dev, "- Source Offset Configuration Error\n");
if (es & MPC_DMA_DMAES_DAE)
dev_err(mdma->dma.dev, "- Destination Address Error\n");
if (es & MPC_DMA_DMAES_DOE)
dev_err(mdma->dma.dev, "- Destination Offset Configuration Error\n");
if (es & MPC_DMA_DMAES_NCE)
dev_err(mdma->dma.dev, "- NBytes/Citter Configuration Error\n");
if (es & MPC_DMA_DMAES_SGE)
dev_err(mdma->dma.dev, "- Scatter/Gather Configuration Error\n");
if (es & MPC_DMA_DMAES_SBE)
dev_err(mdma->dma.dev, "- Source Bus Error\n");
if (es & MPC_DMA_DMAES_DBE)
dev_err(mdma->dma.dev, "- Destination Bus Error\n");
}
mpc_dma_process_completed(mdma);
}
/* Submit descriptor to hardware */
static dma_cookie_t mpc_dma_tx_submit(struct dma_async_tx_descriptor *txd)
{
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(txd->chan);
struct mpc_dma_desc *mdesc;
unsigned long flags;
dma_cookie_t cookie;
mdesc = container_of(txd, struct mpc_dma_desc, desc);
spin_lock_irqsave(&mchan->lock, flags);
/* Move descriptor to queue */
list_move_tail(&mdesc->node, &mchan->queued);
/* If channel is idle, execute all queued descriptors */
if (list_empty(&mchan->active))
mpc_dma_execute(mchan);
/* Update cookie */
cookie = dma_cookie_assign(txd);
spin_unlock_irqrestore(&mchan->lock, flags);
return cookie;
}
/* Alloc channel resources */
static int mpc_dma_alloc_chan_resources(struct dma_chan *chan)
{
struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan);
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
struct mpc_dma_desc *mdesc;
struct mpc_dma_tcd *tcd;
dma_addr_t tcd_paddr;
unsigned long flags;
LIST_HEAD(descs);
int i;
/* Alloc DMA memory for Transfer Control Descriptors */
tcd = dma_alloc_coherent(mdma->dma.dev,
MPC_DMA_DESCRIPTORS * sizeof(struct mpc_dma_tcd),
&tcd_paddr, GFP_KERNEL);
if (!tcd)
return -ENOMEM;
/* Alloc descriptors for this channel */
for (i = 0; i < MPC_DMA_DESCRIPTORS; i++) {
mdesc = kzalloc(sizeof(struct mpc_dma_desc), GFP_KERNEL);
if (!mdesc) {
dev_notice(mdma->dma.dev,
"Memory allocation error. Allocated only %u descriptors\n", i);
break;
}
dma_async_tx_descriptor_init(&mdesc->desc, chan);
mdesc->desc.flags = DMA_CTRL_ACK;
mdesc->desc.tx_submit = mpc_dma_tx_submit;
mdesc->tcd = &tcd[i];
mdesc->tcd_paddr = tcd_paddr + (i * sizeof(struct mpc_dma_tcd));
list_add_tail(&mdesc->node, &descs);
}
/* Return error only if no descriptors were allocated */
if (i == 0) {
dma_free_coherent(mdma->dma.dev,
MPC_DMA_DESCRIPTORS * sizeof(struct mpc_dma_tcd),
tcd, tcd_paddr);
return -ENOMEM;
}
spin_lock_irqsave(&mchan->lock, flags);
mchan->tcd = tcd;
mchan->tcd_paddr = tcd_paddr;
list_splice_tail_init(&descs, &mchan->free);
spin_unlock_irqrestore(&mchan->lock, flags);
/* Enable Error Interrupt */
out_8(&mdma->regs->dmaseei, chan->chan_id);
return 0;
}
/* Free channel resources */
static void mpc_dma_free_chan_resources(struct dma_chan *chan)
{
struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan);
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
struct mpc_dma_desc *mdesc, *tmp;
struct mpc_dma_tcd *tcd;
dma_addr_t tcd_paddr;
unsigned long flags;
LIST_HEAD(descs);
spin_lock_irqsave(&mchan->lock, flags);
/* Channel must be idle */
BUG_ON(!list_empty(&mchan->prepared));
BUG_ON(!list_empty(&mchan->queued));
BUG_ON(!list_empty(&mchan->active));
BUG_ON(!list_empty(&mchan->completed));
/* Move data */
list_splice_tail_init(&mchan->free, &descs);
tcd = mchan->tcd;
tcd_paddr = mchan->tcd_paddr;
spin_unlock_irqrestore(&mchan->lock, flags);
/* Free DMA memory used by descriptors */
dma_free_coherent(mdma->dma.dev,
MPC_DMA_DESCRIPTORS * sizeof(struct mpc_dma_tcd),
tcd, tcd_paddr);
/* Free descriptors */
list_for_each_entry_safe(mdesc, tmp, &descs, node)
kfree(mdesc);
/* Disable Error Interrupt */
out_8(&mdma->regs->dmaceei, chan->chan_id);
}
/* Send all pending descriptor to hardware */
static void mpc_dma_issue_pending(struct dma_chan *chan)
{
/*
* We are posting descriptors to the hardware as soon as
* they are ready, so this function does nothing.
*/
}
/* Check request completion status */
static enum dma_status
mpc_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(chan, cookie, txstate);
}
/* Prepare descriptor for memory to memory copy */
static struct dma_async_tx_descriptor *
mpc_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan);
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
struct mpc_dma_desc *mdesc = NULL;
struct mpc_dma_tcd *tcd;
unsigned long iflags;
/* Get free descriptor */
spin_lock_irqsave(&mchan->lock, iflags);
if (!list_empty(&mchan->free)) {
mdesc = list_first_entry(&mchan->free, struct mpc_dma_desc,
node);
list_del(&mdesc->node);
}
spin_unlock_irqrestore(&mchan->lock, iflags);
if (!mdesc) {
/* try to free completed descriptors */
mpc_dma_process_completed(mdma);
return NULL;
}
mdesc->error = 0;
mdesc->will_access_peripheral = 0;
tcd = mdesc->tcd;
/* Prepare Transfer Control Descriptor for this transaction */
memset(tcd, 0, sizeof(struct mpc_dma_tcd));
if (IS_ALIGNED(src | dst | len, 32)) {
tcd->ssize = MPC_DMA_TSIZE_32;
tcd->dsize = MPC_DMA_TSIZE_32;
tcd->soff = 32;
tcd->doff = 32;
} else if (!mdma->is_mpc8308 && IS_ALIGNED(src | dst | len, 16)) {
/* MPC8308 doesn't support 16 byte transfers */
tcd->ssize = MPC_DMA_TSIZE_16;
tcd->dsize = MPC_DMA_TSIZE_16;
tcd->soff = 16;
tcd->doff = 16;
} else if (IS_ALIGNED(src | dst | len, 4)) {
tcd->ssize = MPC_DMA_TSIZE_4;
tcd->dsize = MPC_DMA_TSIZE_4;
tcd->soff = 4;
tcd->doff = 4;
} else if (IS_ALIGNED(src | dst | len, 2)) {
tcd->ssize = MPC_DMA_TSIZE_2;
tcd->dsize = MPC_DMA_TSIZE_2;
tcd->soff = 2;
tcd->doff = 2;
} else {
tcd->ssize = MPC_DMA_TSIZE_1;
tcd->dsize = MPC_DMA_TSIZE_1;
tcd->soff = 1;
tcd->doff = 1;
}
tcd->saddr = src;
tcd->daddr = dst;
tcd->nbytes = len;
tcd->biter = 1;
tcd->citer = 1;
/* Place descriptor in prepared list */
spin_lock_irqsave(&mchan->lock, iflags);
list_add_tail(&mdesc->node, &mchan->prepared);
spin_unlock_irqrestore(&mchan->lock, iflags);
return &mdesc->desc;
}
inline u8 buswidth_to_dmatsize(u8 buswidth)
{
u8 res;
for (res = 0; buswidth > 1; buswidth /= 2)
res++;
return res;
}
static struct dma_async_tx_descriptor *
mpc_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan);
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
struct mpc_dma_desc *mdesc = NULL;
dma_addr_t per_paddr;
u32 tcd_nunits;
struct mpc_dma_tcd *tcd;
unsigned long iflags;
struct scatterlist *sg;
size_t len;
int iter, i;
/* Currently there is no proper support for scatter/gather */
if (sg_len != 1)
return NULL;
if (!is_slave_direction(direction))
return NULL;
for_each_sg(sgl, sg, sg_len, i) {
spin_lock_irqsave(&mchan->lock, iflags);
mdesc = list_first_entry(&mchan->free,
struct mpc_dma_desc, node);
if (!mdesc) {
spin_unlock_irqrestore(&mchan->lock, iflags);
/* Try to free completed descriptors */
mpc_dma_process_completed(mdma);
return NULL;
}
list_del(&mdesc->node);
if (direction == DMA_DEV_TO_MEM) {
per_paddr = mchan->src_per_paddr;
tcd_nunits = mchan->src_tcd_nunits;
} else {
per_paddr = mchan->dst_per_paddr;
tcd_nunits = mchan->dst_tcd_nunits;
}
spin_unlock_irqrestore(&mchan->lock, iflags);
if (per_paddr == 0 || tcd_nunits == 0)
goto err_prep;
mdesc->error = 0;
mdesc->will_access_peripheral = 1;
/* Prepare Transfer Control Descriptor for this transaction */
tcd = mdesc->tcd;
memset(tcd, 0, sizeof(struct mpc_dma_tcd));
if (direction == DMA_DEV_TO_MEM) {
tcd->saddr = per_paddr;
tcd->daddr = sg_dma_address(sg);
if (!IS_ALIGNED(sg_dma_address(sg), mchan->dwidth))
goto err_prep;
tcd->soff = 0;
tcd->doff = mchan->dwidth;
} else {
tcd->saddr = sg_dma_address(sg);
tcd->daddr = per_paddr;
if (!IS_ALIGNED(sg_dma_address(sg), mchan->swidth))
goto err_prep;
tcd->soff = mchan->swidth;
tcd->doff = 0;
}
tcd->ssize = buswidth_to_dmatsize(mchan->swidth);
tcd->dsize = buswidth_to_dmatsize(mchan->dwidth);
if (mdma->is_mpc8308) {
tcd->nbytes = sg_dma_len(sg);
if (!IS_ALIGNED(tcd->nbytes, mchan->swidth))
goto err_prep;
/* No major loops for MPC8303 */
tcd->biter = 1;
tcd->citer = 1;
} else {
len = sg_dma_len(sg);
tcd->nbytes = tcd_nunits * tcd->ssize;
if (!IS_ALIGNED(len, tcd->nbytes))
goto err_prep;
iter = len / tcd->nbytes;
if (iter >= 1 << 15) {
/* len is too big */
goto err_prep;
}
/* citer_linkch contains the high bits of iter */
tcd->biter = iter & 0x1ff;
tcd->biter_linkch = iter >> 9;
tcd->citer = tcd->biter;
tcd->citer_linkch = tcd->biter_linkch;
}
tcd->e_sg = 0;
tcd->d_req = 1;
/* Place descriptor in prepared list */
spin_lock_irqsave(&mchan->lock, iflags);
list_add_tail(&mdesc->node, &mchan->prepared);
spin_unlock_irqrestore(&mchan->lock, iflags);
}
return &mdesc->desc;
err_prep:
/* Put the descriptor back */
spin_lock_irqsave(&mchan->lock, iflags);
list_add_tail(&mdesc->node, &mchan->free);
spin_unlock_irqrestore(&mchan->lock, iflags);
return NULL;
}
inline bool is_buswidth_valid(u8 buswidth, bool is_mpc8308)
{
switch (buswidth) {
case 16:
if (is_mpc8308)
return false;
break;
case 1:
case 2:
case 4:
case 32:
break;
default:
return false;
}
return true;
}
static int mpc_dma_device_config(struct dma_chan *chan,
struct dma_slave_config *cfg)
{
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
struct mpc_dma *mdma = dma_chan_to_mpc_dma(&mchan->chan);
unsigned long flags;
/*
* Software constraints:
* - only transfers between a peripheral device and memory are
* supported
* - transfer chunk sizes of 1, 2, 4, 16 (for MPC512x), and 32 bytes
* are supported, and, consequently, source addresses and
* destination addresses; must be aligned accordingly; furthermore,
* for MPC512x SoCs, the transfer size must be aligned on (chunk
* size * maxburst)
* - during the transfer, the RAM address is incremented by the size
* of transfer chunk
* - the peripheral port's address is constant during the transfer.
*/
if (!IS_ALIGNED(cfg->src_addr, cfg->src_addr_width) ||
!IS_ALIGNED(cfg->dst_addr, cfg->dst_addr_width)) {
return -EINVAL;
}
if (!is_buswidth_valid(cfg->src_addr_width, mdma->is_mpc8308) ||
!is_buswidth_valid(cfg->dst_addr_width, mdma->is_mpc8308))
return -EINVAL;
spin_lock_irqsave(&mchan->lock, flags);
mchan->src_per_paddr = cfg->src_addr;
mchan->src_tcd_nunits = cfg->src_maxburst;
mchan->swidth = cfg->src_addr_width;
mchan->dst_per_paddr = cfg->dst_addr;
mchan->dst_tcd_nunits = cfg->dst_maxburst;
mchan->dwidth = cfg->dst_addr_width;
/* Apply defaults */
if (mchan->src_tcd_nunits == 0)
mchan->src_tcd_nunits = 1;
if (mchan->dst_tcd_nunits == 0)
mchan->dst_tcd_nunits = 1;
spin_unlock_irqrestore(&mchan->lock, flags);
return 0;
}
static int mpc_dma_device_terminate_all(struct dma_chan *chan)
{
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan);
unsigned long flags;
/* Disable channel requests */
spin_lock_irqsave(&mchan->lock, flags);
out_8(&mdma->regs->dmacerq, chan->chan_id);
list_splice_tail_init(&mchan->prepared, &mchan->free);
list_splice_tail_init(&mchan->queued, &mchan->free);
list_splice_tail_init(&mchan->active, &mchan->free);
spin_unlock_irqrestore(&mchan->lock, flags);
return 0;
}
static int mpc_dma_probe(struct platform_device *op)
{
struct device_node *dn = op->dev.of_node;
struct device *dev = &op->dev;
struct dma_device *dma;
struct mpc_dma *mdma;
struct mpc_dma_chan *mchan;
struct resource res;
ulong regs_start, regs_size;
int retval, i;
u8 chancnt;
mdma = devm_kzalloc(dev, sizeof(struct mpc_dma), GFP_KERNEL);
if (!mdma) {
retval = -ENOMEM;
goto err;
}
mdma->irq = irq_of_parse_and_map(dn, 0);
if (!mdma->irq) {
dev_err(dev, "Error mapping IRQ!\n");
retval = -EINVAL;
goto err;
}
if (of_device_is_compatible(dn, "fsl,mpc8308-dma")) {
mdma->is_mpc8308 = 1;
mdma->irq2 = irq_of_parse_and_map(dn, 1);
if (!mdma->irq2) {
dev_err(dev, "Error mapping IRQ!\n");
retval = -EINVAL;
goto err_dispose1;
}
}
retval = of_address_to_resource(dn, 0, &res);
if (retval) {
dev_err(dev, "Error parsing memory region!\n");
goto err_dispose2;
}
regs_start = res.start;
regs_size = resource_size(&res);
if (!devm_request_mem_region(dev, regs_start, regs_size, DRV_NAME)) {
dev_err(dev, "Error requesting memory region!\n");
retval = -EBUSY;
goto err_dispose2;
}
mdma->regs = devm_ioremap(dev, regs_start, regs_size);
if (!mdma->regs) {
dev_err(dev, "Error mapping memory region!\n");
retval = -ENOMEM;
goto err_dispose2;
}
mdma->tcd = (struct mpc_dma_tcd *)((u8 *)(mdma->regs)
+ MPC_DMA_TCD_OFFSET);
retval = request_irq(mdma->irq, &mpc_dma_irq, 0, DRV_NAME, mdma);
if (retval) {
dev_err(dev, "Error requesting IRQ!\n");
retval = -EINVAL;
goto err_dispose2;
}
if (mdma->is_mpc8308) {
retval = request_irq(mdma->irq2, &mpc_dma_irq, 0,
DRV_NAME, mdma);
if (retval) {
dev_err(dev, "Error requesting IRQ2!\n");
retval = -EINVAL;
goto err_free1;
}
}
spin_lock_init(&mdma->error_status_lock);
dma = &mdma->dma;
dma->dev = dev;
dma->device_alloc_chan_resources = mpc_dma_alloc_chan_resources;
dma->device_free_chan_resources = mpc_dma_free_chan_resources;
dma->device_issue_pending = mpc_dma_issue_pending;
dma->device_tx_status = mpc_dma_tx_status;
dma->device_prep_dma_memcpy = mpc_dma_prep_memcpy;
dma->device_prep_slave_sg = mpc_dma_prep_slave_sg;
dma->device_config = mpc_dma_device_config;
dma->device_terminate_all = mpc_dma_device_terminate_all;
INIT_LIST_HEAD(&dma->channels);
dma_cap_set(DMA_MEMCPY, dma->cap_mask);
dma_cap_set(DMA_SLAVE, dma->cap_mask);
if (mdma->is_mpc8308)
chancnt = MPC8308_DMACHAN_MAX;
else
chancnt = MPC512x_DMACHAN_MAX;
for (i = 0; i < chancnt; i++) {
mchan = &mdma->channels[i];
mchan->chan.device = dma;
dma_cookie_init(&mchan->chan);
INIT_LIST_HEAD(&mchan->free);
INIT_LIST_HEAD(&mchan->prepared);
INIT_LIST_HEAD(&mchan->queued);
INIT_LIST_HEAD(&mchan->active);
INIT_LIST_HEAD(&mchan->completed);
spin_lock_init(&mchan->lock);
list_add_tail(&mchan->chan.device_node, &dma->channels);
}
tasklet_setup(&mdma->tasklet, mpc_dma_tasklet);
/*
* Configure DMA Engine:
* - Dynamic clock,
* - Round-robin group arbitration,
* - Round-robin channel arbitration.
*/
if (mdma->is_mpc8308) {
/* MPC8308 has 16 channels and lacks some registers */
out_be32(&mdma->regs->dmacr, MPC_DMA_DMACR_ERCA);
/* enable snooping */
out_be32(&mdma->regs->dmagpor, MPC_DMA_DMAGPOR_SNOOP_ENABLE);
/* Disable error interrupts */
out_be32(&mdma->regs->dmaeeil, 0);
/* Clear interrupts status */
out_be32(&mdma->regs->dmaintl, 0xFFFF);
out_be32(&mdma->regs->dmaerrl, 0xFFFF);
} else {
out_be32(&mdma->regs->dmacr, MPC_DMA_DMACR_EDCG |
MPC_DMA_DMACR_ERGA |
MPC_DMA_DMACR_ERCA);
/* Disable hardware DMA requests */
out_be32(&mdma->regs->dmaerqh, 0);
out_be32(&mdma->regs->dmaerql, 0);
/* Disable error interrupts */
out_be32(&mdma->regs->dmaeeih, 0);
out_be32(&mdma->regs->dmaeeil, 0);
/* Clear interrupts status */
out_be32(&mdma->regs->dmainth, 0xFFFFFFFF);
out_be32(&mdma->regs->dmaintl, 0xFFFFFFFF);
out_be32(&mdma->regs->dmaerrh, 0xFFFFFFFF);
out_be32(&mdma->regs->dmaerrl, 0xFFFFFFFF);
/* Route interrupts to IPIC */
out_be32(&mdma->regs->dmaihsa, 0);
out_be32(&mdma->regs->dmailsa, 0);
}
/* Register DMA engine */
dev_set_drvdata(dev, mdma);
retval = dma_async_device_register(dma);
if (retval)
goto err_free2;
/* Register with OF helpers for DMA lookups (nonfatal) */
if (dev->of_node) {
retval = of_dma_controller_register(dev->of_node,
of_dma_xlate_by_chan_id, mdma);
if (retval)
dev_warn(dev, "Could not register for OF lookup\n");
}
return 0;
err_free2:
if (mdma->is_mpc8308)
free_irq(mdma->irq2, mdma);
err_free1:
free_irq(mdma->irq, mdma);
err_dispose2:
if (mdma->is_mpc8308)
irq_dispose_mapping(mdma->irq2);
err_dispose1:
irq_dispose_mapping(mdma->irq);
err:
return retval;
}
static int mpc_dma_remove(struct platform_device *op)
{
struct device *dev = &op->dev;
struct mpc_dma *mdma = dev_get_drvdata(dev);
if (dev->of_node)
of_dma_controller_free(dev->of_node);
dma_async_device_unregister(&mdma->dma);
if (mdma->is_mpc8308) {
free_irq(mdma->irq2, mdma);
irq_dispose_mapping(mdma->irq2);
}
free_irq(mdma->irq, mdma);
irq_dispose_mapping(mdma->irq);
tasklet_kill(&mdma->tasklet);
return 0;
}
static const struct of_device_id mpc_dma_match[] = {
{ .compatible = "fsl,mpc5121-dma", },
{ .compatible = "fsl,mpc8308-dma", },
{},
};
MODULE_DEVICE_TABLE(of, mpc_dma_match);
static struct platform_driver mpc_dma_driver = {
.probe = mpc_dma_probe,
.remove = mpc_dma_remove,
.driver = {
.name = DRV_NAME,
.of_match_table = mpc_dma_match,
},
};
module_platform_driver(mpc_dma_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Piotr Ziecik <[email protected]>");
| linux-master | drivers/dma/mpc512x_dma.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2013-2014 Renesas Electronics Europe Ltd.
* Author: Guennadi Liakhovetski <[email protected]>
*/
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <dt-bindings/dma/nbpfaxi.h>
#include "dmaengine.h"
#define NBPF_REG_CHAN_OFFSET 0
#define NBPF_REG_CHAN_SIZE 0x40
/* Channel Current Transaction Byte register */
#define NBPF_CHAN_CUR_TR_BYTE 0x20
/* Channel Status register */
#define NBPF_CHAN_STAT 0x24
#define NBPF_CHAN_STAT_EN 1
#define NBPF_CHAN_STAT_TACT 4
#define NBPF_CHAN_STAT_ERR 0x10
#define NBPF_CHAN_STAT_END 0x20
#define NBPF_CHAN_STAT_TC 0x40
#define NBPF_CHAN_STAT_DER 0x400
/* Channel Control register */
#define NBPF_CHAN_CTRL 0x28
#define NBPF_CHAN_CTRL_SETEN 1
#define NBPF_CHAN_CTRL_CLREN 2
#define NBPF_CHAN_CTRL_STG 4
#define NBPF_CHAN_CTRL_SWRST 8
#define NBPF_CHAN_CTRL_CLRRQ 0x10
#define NBPF_CHAN_CTRL_CLREND 0x20
#define NBPF_CHAN_CTRL_CLRTC 0x40
#define NBPF_CHAN_CTRL_SETSUS 0x100
#define NBPF_CHAN_CTRL_CLRSUS 0x200
/* Channel Configuration register */
#define NBPF_CHAN_CFG 0x2c
#define NBPF_CHAN_CFG_SEL 7 /* terminal SELect: 0..7 */
#define NBPF_CHAN_CFG_REQD 8 /* REQuest Direction: DMAREQ is 0: input, 1: output */
#define NBPF_CHAN_CFG_LOEN 0x10 /* LOw ENable: low DMA request line is: 0: inactive, 1: active */
#define NBPF_CHAN_CFG_HIEN 0x20 /* HIgh ENable: high DMA request line is: 0: inactive, 1: active */
#define NBPF_CHAN_CFG_LVL 0x40 /* LeVeL: DMA request line is sensed as 0: edge, 1: level */
#define NBPF_CHAN_CFG_AM 0x700 /* ACK Mode: 0: Pulse mode, 1: Level mode, b'1x: Bus Cycle */
#define NBPF_CHAN_CFG_SDS 0xf000 /* Source Data Size: 0: 8 bits,... , 7: 1024 bits */
#define NBPF_CHAN_CFG_DDS 0xf0000 /* Destination Data Size: as above */
#define NBPF_CHAN_CFG_SAD 0x100000 /* Source ADdress counting: 0: increment, 1: fixed */
#define NBPF_CHAN_CFG_DAD 0x200000 /* Destination ADdress counting: 0: increment, 1: fixed */
#define NBPF_CHAN_CFG_TM 0x400000 /* Transfer Mode: 0: single, 1: block TM */
#define NBPF_CHAN_CFG_DEM 0x1000000 /* DMAEND interrupt Mask */
#define NBPF_CHAN_CFG_TCM 0x2000000 /* DMATCO interrupt Mask */
#define NBPF_CHAN_CFG_SBE 0x8000000 /* Sweep Buffer Enable */
#define NBPF_CHAN_CFG_RSEL 0x10000000 /* RM: Register Set sELect */
#define NBPF_CHAN_CFG_RSW 0x20000000 /* RM: Register Select sWitch */
#define NBPF_CHAN_CFG_REN 0x40000000 /* RM: Register Set Enable */
#define NBPF_CHAN_CFG_DMS 0x80000000 /* 0: register mode (RM), 1: link mode (LM) */
#define NBPF_CHAN_NXLA 0x38
#define NBPF_CHAN_CRLA 0x3c
/* Link Header field */
#define NBPF_HEADER_LV 1
#define NBPF_HEADER_LE 2
#define NBPF_HEADER_WBD 4
#define NBPF_HEADER_DIM 8
#define NBPF_CTRL 0x300
#define NBPF_CTRL_PR 1 /* 0: fixed priority, 1: round robin */
#define NBPF_CTRL_LVINT 2 /* DMAEND and DMAERR signalling: 0: pulse, 1: level */
#define NBPF_DSTAT_ER 0x314
#define NBPF_DSTAT_END 0x318
#define NBPF_DMA_BUSWIDTHS \
(BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
struct nbpf_config {
int num_channels;
int buffer_size;
};
/*
* We've got 3 types of objects, used to describe DMA transfers:
* 1. high-level descriptor, containing a struct dma_async_tx_descriptor object
* in it, used to communicate with the user
* 2. hardware DMA link descriptors, that we pass to DMAC for DMA transfer
* queuing, these must be DMAable, using either the streaming DMA API or
* allocated from coherent memory - one per SG segment
* 3. one per SG segment descriptors, used to manage HW link descriptors from
* (2). They do not have to be DMAable. They can either be (a) allocated
* together with link descriptors as mixed (DMA / CPU) objects, or (b)
* separately. Even if allocated separately it would be best to link them
* to link descriptors once during channel resource allocation and always
* use them as a single object.
* Therefore for both cases (a) and (b) at run-time objects (2) and (3) shall be
* treated as a single SG segment descriptor.
*/
struct nbpf_link_reg {
u32 header;
u32 src_addr;
u32 dst_addr;
u32 transaction_size;
u32 config;
u32 interval;
u32 extension;
u32 next;
} __packed;
struct nbpf_device;
struct nbpf_channel;
struct nbpf_desc;
struct nbpf_link_desc {
struct nbpf_link_reg *hwdesc;
dma_addr_t hwdesc_dma_addr;
struct nbpf_desc *desc;
struct list_head node;
};
/**
* struct nbpf_desc - DMA transfer descriptor
* @async_tx: dmaengine object
* @user_wait: waiting for a user ack
* @length: total transfer length
* @chan: associated DMAC channel
* @sg: list of hardware descriptors, represented by struct nbpf_link_desc
* @node: member in channel descriptor lists
*/
struct nbpf_desc {
struct dma_async_tx_descriptor async_tx;
bool user_wait;
size_t length;
struct nbpf_channel *chan;
struct list_head sg;
struct list_head node;
};
/* Take a wild guess: allocate 4 segments per descriptor */
#define NBPF_SEGMENTS_PER_DESC 4
#define NBPF_DESCS_PER_PAGE ((PAGE_SIZE - sizeof(struct list_head)) / \
(sizeof(struct nbpf_desc) + \
NBPF_SEGMENTS_PER_DESC * \
(sizeof(struct nbpf_link_desc) + sizeof(struct nbpf_link_reg))))
#define NBPF_SEGMENTS_PER_PAGE (NBPF_SEGMENTS_PER_DESC * NBPF_DESCS_PER_PAGE)
struct nbpf_desc_page {
struct list_head node;
struct nbpf_desc desc[NBPF_DESCS_PER_PAGE];
struct nbpf_link_desc ldesc[NBPF_SEGMENTS_PER_PAGE];
struct nbpf_link_reg hwdesc[NBPF_SEGMENTS_PER_PAGE];
};
/**
* struct nbpf_channel - one DMAC channel
* @dma_chan: standard dmaengine channel object
* @tasklet: channel specific tasklet used for callbacks
* @base: register address base
* @nbpf: DMAC
* @name: IRQ name
* @irq: IRQ number
* @slave_src_addr: source address for slave DMA
* @slave_src_width: source slave data size in bytes
* @slave_src_burst: maximum source slave burst size in bytes
* @slave_dst_addr: destination address for slave DMA
* @slave_dst_width: destination slave data size in bytes
* @slave_dst_burst: maximum destination slave burst size in bytes
* @terminal: DMA terminal, assigned to this channel
* @dmarq_cfg: DMA request line configuration - high / low, edge / level for NBPF_CHAN_CFG
* @flags: configuration flags from DT
* @lock: protect descriptor lists
* @free_links: list of free link descriptors
* @free: list of free descriptors
* @queued: list of queued descriptors
* @active: list of descriptors, scheduled for processing
* @done: list of completed descriptors, waiting post-processing
* @desc_page: list of additionally allocated descriptor pages - if any
* @running: linked descriptor of running transaction
* @paused: are translations on this channel paused?
*/
struct nbpf_channel {
struct dma_chan dma_chan;
struct tasklet_struct tasklet;
void __iomem *base;
struct nbpf_device *nbpf;
char name[16];
int irq;
dma_addr_t slave_src_addr;
size_t slave_src_width;
size_t slave_src_burst;
dma_addr_t slave_dst_addr;
size_t slave_dst_width;
size_t slave_dst_burst;
unsigned int terminal;
u32 dmarq_cfg;
unsigned long flags;
spinlock_t lock;
struct list_head free_links;
struct list_head free;
struct list_head queued;
struct list_head active;
struct list_head done;
struct list_head desc_page;
struct nbpf_desc *running;
bool paused;
};
struct nbpf_device {
struct dma_device dma_dev;
void __iomem *base;
u32 max_burst_mem_read;
u32 max_burst_mem_write;
struct clk *clk;
const struct nbpf_config *config;
unsigned int eirq;
struct nbpf_channel chan[];
};
enum nbpf_model {
NBPF1B4,
NBPF1B8,
NBPF1B16,
NBPF4B4,
NBPF4B8,
NBPF4B16,
NBPF8B4,
NBPF8B8,
NBPF8B16,
};
static struct nbpf_config nbpf_cfg[] = {
[NBPF1B4] = {
.num_channels = 1,
.buffer_size = 4,
},
[NBPF1B8] = {
.num_channels = 1,
.buffer_size = 8,
},
[NBPF1B16] = {
.num_channels = 1,
.buffer_size = 16,
},
[NBPF4B4] = {
.num_channels = 4,
.buffer_size = 4,
},
[NBPF4B8] = {
.num_channels = 4,
.buffer_size = 8,
},
[NBPF4B16] = {
.num_channels = 4,
.buffer_size = 16,
},
[NBPF8B4] = {
.num_channels = 8,
.buffer_size = 4,
},
[NBPF8B8] = {
.num_channels = 8,
.buffer_size = 8,
},
[NBPF8B16] = {
.num_channels = 8,
.buffer_size = 16,
},
};
#define nbpf_to_chan(d) container_of(d, struct nbpf_channel, dma_chan)
/*
* dmaengine drivers seem to have a lot in common and instead of sharing more
* code, they reimplement those common algorithms independently. In this driver
* we try to separate the hardware-specific part from the (largely) generic
* part. This improves code readability and makes it possible in the future to
* reuse the generic code in form of a helper library. That generic code should
* be suitable for various DMA controllers, using transfer descriptors in RAM
* and pushing one SG list at a time to the DMA controller.
*/
/* Hardware-specific part */
static inline u32 nbpf_chan_read(struct nbpf_channel *chan,
unsigned int offset)
{
u32 data = ioread32(chan->base + offset);
dev_dbg(chan->dma_chan.device->dev, "%s(0x%p + 0x%x) = 0x%x\n",
__func__, chan->base, offset, data);
return data;
}
static inline void nbpf_chan_write(struct nbpf_channel *chan,
unsigned int offset, u32 data)
{
iowrite32(data, chan->base + offset);
dev_dbg(chan->dma_chan.device->dev, "%s(0x%p + 0x%x) = 0x%x\n",
__func__, chan->base, offset, data);
}
static inline u32 nbpf_read(struct nbpf_device *nbpf,
unsigned int offset)
{
u32 data = ioread32(nbpf->base + offset);
dev_dbg(nbpf->dma_dev.dev, "%s(0x%p + 0x%x) = 0x%x\n",
__func__, nbpf->base, offset, data);
return data;
}
static inline void nbpf_write(struct nbpf_device *nbpf,
unsigned int offset, u32 data)
{
iowrite32(data, nbpf->base + offset);
dev_dbg(nbpf->dma_dev.dev, "%s(0x%p + 0x%x) = 0x%x\n",
__func__, nbpf->base, offset, data);
}
static void nbpf_chan_halt(struct nbpf_channel *chan)
{
nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_CLREN);
}
static bool nbpf_status_get(struct nbpf_channel *chan)
{
u32 status = nbpf_read(chan->nbpf, NBPF_DSTAT_END);
return status & BIT(chan - chan->nbpf->chan);
}
static void nbpf_status_ack(struct nbpf_channel *chan)
{
nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_CLREND);
}
static u32 nbpf_error_get(struct nbpf_device *nbpf)
{
return nbpf_read(nbpf, NBPF_DSTAT_ER);
}
static struct nbpf_channel *nbpf_error_get_channel(struct nbpf_device *nbpf, u32 error)
{
return nbpf->chan + __ffs(error);
}
static void nbpf_error_clear(struct nbpf_channel *chan)
{
u32 status;
int i;
/* Stop the channel, make sure DMA has been aborted */
nbpf_chan_halt(chan);
for (i = 1000; i; i--) {
status = nbpf_chan_read(chan, NBPF_CHAN_STAT);
if (!(status & NBPF_CHAN_STAT_TACT))
break;
cpu_relax();
}
if (!i)
dev_err(chan->dma_chan.device->dev,
"%s(): abort timeout, channel status 0x%x\n", __func__, status);
nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_SWRST);
}
static int nbpf_start(struct nbpf_desc *desc)
{
struct nbpf_channel *chan = desc->chan;
struct nbpf_link_desc *ldesc = list_first_entry(&desc->sg, struct nbpf_link_desc, node);
nbpf_chan_write(chan, NBPF_CHAN_NXLA, (u32)ldesc->hwdesc_dma_addr);
nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_SETEN | NBPF_CHAN_CTRL_CLRSUS);
chan->paused = false;
/* Software trigger MEMCPY - only MEMCPY uses the block mode */
if (ldesc->hwdesc->config & NBPF_CHAN_CFG_TM)
nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_STG);
dev_dbg(chan->nbpf->dma_dev.dev, "%s(): next 0x%x, cur 0x%x\n", __func__,
nbpf_chan_read(chan, NBPF_CHAN_NXLA), nbpf_chan_read(chan, NBPF_CHAN_CRLA));
return 0;
}
static void nbpf_chan_prepare(struct nbpf_channel *chan)
{
chan->dmarq_cfg = (chan->flags & NBPF_SLAVE_RQ_HIGH ? NBPF_CHAN_CFG_HIEN : 0) |
(chan->flags & NBPF_SLAVE_RQ_LOW ? NBPF_CHAN_CFG_LOEN : 0) |
(chan->flags & NBPF_SLAVE_RQ_LEVEL ?
NBPF_CHAN_CFG_LVL | (NBPF_CHAN_CFG_AM & 0x200) : 0) |
chan->terminal;
}
static void nbpf_chan_prepare_default(struct nbpf_channel *chan)
{
/* Don't output DMAACK */
chan->dmarq_cfg = NBPF_CHAN_CFG_AM & 0x400;
chan->terminal = 0;
chan->flags = 0;
}
static void nbpf_chan_configure(struct nbpf_channel *chan)
{
/*
* We assume, that only the link mode and DMA request line configuration
* have to be set in the configuration register manually. Dynamic
* per-transfer configuration will be loaded from transfer descriptors.
*/
nbpf_chan_write(chan, NBPF_CHAN_CFG, NBPF_CHAN_CFG_DMS | chan->dmarq_cfg);
}
static u32 nbpf_xfer_ds(struct nbpf_device *nbpf, size_t size,
enum dma_transfer_direction direction)
{
int max_burst = nbpf->config->buffer_size * 8;
if (nbpf->max_burst_mem_read || nbpf->max_burst_mem_write) {
switch (direction) {
case DMA_MEM_TO_MEM:
max_burst = min_not_zero(nbpf->max_burst_mem_read,
nbpf->max_burst_mem_write);
break;
case DMA_MEM_TO_DEV:
if (nbpf->max_burst_mem_read)
max_burst = nbpf->max_burst_mem_read;
break;
case DMA_DEV_TO_MEM:
if (nbpf->max_burst_mem_write)
max_burst = nbpf->max_burst_mem_write;
break;
case DMA_DEV_TO_DEV:
default:
break;
}
}
/* Maximum supported bursts depend on the buffer size */
return min_t(int, __ffs(size), ilog2(max_burst));
}
static size_t nbpf_xfer_size(struct nbpf_device *nbpf,
enum dma_slave_buswidth width, u32 burst)
{
size_t size;
if (!burst)
burst = 1;
switch (width) {
case DMA_SLAVE_BUSWIDTH_8_BYTES:
size = 8 * burst;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
size = 4 * burst;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
size = 2 * burst;
break;
default:
pr_warn("%s(): invalid bus width %u\n", __func__, width);
fallthrough;
case DMA_SLAVE_BUSWIDTH_1_BYTE:
size = burst;
}
return nbpf_xfer_ds(nbpf, size, DMA_TRANS_NONE);
}
/*
* We need a way to recognise slaves, whose data is sent "raw" over the bus,
* i.e. it isn't known in advance how many bytes will be received. Therefore
* the slave driver has to provide a "large enough" buffer and either read the
* buffer, when it is full, or detect, that some data has arrived, then wait for
* a timeout, if no more data arrives - receive what's already there. We want to
* handle such slaves in a special way to allow an optimised mode for other
* users, for whom the amount of data is known in advance. So far there's no way
* to recognise such slaves. We use a data-width check to distinguish between
* the SD host and the PL011 UART.
*/
static int nbpf_prep_one(struct nbpf_link_desc *ldesc,
enum dma_transfer_direction direction,
dma_addr_t src, dma_addr_t dst, size_t size, bool last)
{
struct nbpf_link_reg *hwdesc = ldesc->hwdesc;
struct nbpf_desc *desc = ldesc->desc;
struct nbpf_channel *chan = desc->chan;
struct device *dev = chan->dma_chan.device->dev;
size_t mem_xfer, slave_xfer;
bool can_burst;
hwdesc->header = NBPF_HEADER_WBD | NBPF_HEADER_LV |
(last ? NBPF_HEADER_LE : 0);
hwdesc->src_addr = src;
hwdesc->dst_addr = dst;
hwdesc->transaction_size = size;
/*
* set config: SAD, DAD, DDS, SDS, etc.
* Note on transfer sizes: the DMAC can perform unaligned DMA transfers,
* but it is important to have transaction size a multiple of both
* receiver and transmitter transfer sizes. It is also possible to use
* different RAM and device transfer sizes, and it does work well with
* some devices, e.g. with V08R07S01E SD host controllers, which can use
* 128 byte transfers. But this doesn't work with other devices,
* especially when the transaction size is unknown. This is the case,
* e.g. with serial drivers like amba-pl011.c. For reception it sets up
* the transaction size of 4K and if fewer bytes are received, it
* pauses DMA and reads out data received via DMA as well as those left
* in the Rx FIFO. For this to work with the RAM side using burst
* transfers we enable the SBE bit and terminate the transfer in our
* .device_pause handler.
*/
mem_xfer = nbpf_xfer_ds(chan->nbpf, size, direction);
switch (direction) {
case DMA_DEV_TO_MEM:
can_burst = chan->slave_src_width >= 3;
slave_xfer = min(mem_xfer, can_burst ?
chan->slave_src_burst : chan->slave_src_width);
/*
* Is the slave narrower than 64 bits, i.e. isn't using the full
* bus width and cannot use bursts?
*/
if (mem_xfer > chan->slave_src_burst && !can_burst)
mem_xfer = chan->slave_src_burst;
/* Device-to-RAM DMA is unreliable without REQD set */
hwdesc->config = NBPF_CHAN_CFG_SAD | (NBPF_CHAN_CFG_DDS & (mem_xfer << 16)) |
(NBPF_CHAN_CFG_SDS & (slave_xfer << 12)) | NBPF_CHAN_CFG_REQD |
NBPF_CHAN_CFG_SBE;
break;
case DMA_MEM_TO_DEV:
slave_xfer = min(mem_xfer, chan->slave_dst_width >= 3 ?
chan->slave_dst_burst : chan->slave_dst_width);
hwdesc->config = NBPF_CHAN_CFG_DAD | (NBPF_CHAN_CFG_SDS & (mem_xfer << 12)) |
(NBPF_CHAN_CFG_DDS & (slave_xfer << 16)) | NBPF_CHAN_CFG_REQD;
break;
case DMA_MEM_TO_MEM:
hwdesc->config = NBPF_CHAN_CFG_TCM | NBPF_CHAN_CFG_TM |
(NBPF_CHAN_CFG_SDS & (mem_xfer << 12)) |
(NBPF_CHAN_CFG_DDS & (mem_xfer << 16));
break;
default:
return -EINVAL;
}
hwdesc->config |= chan->dmarq_cfg | (last ? 0 : NBPF_CHAN_CFG_DEM) |
NBPF_CHAN_CFG_DMS;
dev_dbg(dev, "%s(): desc @ %pad: hdr 0x%x, cfg 0x%x, %zu @ %pad -> %pad\n",
__func__, &ldesc->hwdesc_dma_addr, hwdesc->header,
hwdesc->config, size, &src, &dst);
dma_sync_single_for_device(dev, ldesc->hwdesc_dma_addr, sizeof(*hwdesc),
DMA_TO_DEVICE);
return 0;
}
static size_t nbpf_bytes_left(struct nbpf_channel *chan)
{
return nbpf_chan_read(chan, NBPF_CHAN_CUR_TR_BYTE);
}
static void nbpf_configure(struct nbpf_device *nbpf)
{
nbpf_write(nbpf, NBPF_CTRL, NBPF_CTRL_LVINT);
}
/* Generic part */
/* DMA ENGINE functions */
static void nbpf_issue_pending(struct dma_chan *dchan)
{
struct nbpf_channel *chan = nbpf_to_chan(dchan);
unsigned long flags;
dev_dbg(dchan->device->dev, "Entry %s()\n", __func__);
spin_lock_irqsave(&chan->lock, flags);
if (list_empty(&chan->queued))
goto unlock;
list_splice_tail_init(&chan->queued, &chan->active);
if (!chan->running) {
struct nbpf_desc *desc = list_first_entry(&chan->active,
struct nbpf_desc, node);
if (!nbpf_start(desc))
chan->running = desc;
}
unlock:
spin_unlock_irqrestore(&chan->lock, flags);
}
static enum dma_status nbpf_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie, struct dma_tx_state *state)
{
struct nbpf_channel *chan = nbpf_to_chan(dchan);
enum dma_status status = dma_cookie_status(dchan, cookie, state);
if (state) {
dma_cookie_t running;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
running = chan->running ? chan->running->async_tx.cookie : -EINVAL;
if (cookie == running) {
state->residue = nbpf_bytes_left(chan);
dev_dbg(dchan->device->dev, "%s(): residue %u\n", __func__,
state->residue);
} else if (status == DMA_IN_PROGRESS) {
struct nbpf_desc *desc;
bool found = false;
list_for_each_entry(desc, &chan->active, node)
if (desc->async_tx.cookie == cookie) {
found = true;
break;
}
if (!found)
list_for_each_entry(desc, &chan->queued, node)
if (desc->async_tx.cookie == cookie) {
found = true;
break;
}
state->residue = found ? desc->length : 0;
}
spin_unlock_irqrestore(&chan->lock, flags);
}
if (chan->paused)
status = DMA_PAUSED;
return status;
}
static dma_cookie_t nbpf_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct nbpf_desc *desc = container_of(tx, struct nbpf_desc, async_tx);
struct nbpf_channel *chan = desc->chan;
unsigned long flags;
dma_cookie_t cookie;
spin_lock_irqsave(&chan->lock, flags);
cookie = dma_cookie_assign(tx);
list_add_tail(&desc->node, &chan->queued);
spin_unlock_irqrestore(&chan->lock, flags);
dev_dbg(chan->dma_chan.device->dev, "Entry %s(%d)\n", __func__, cookie);
return cookie;
}
static int nbpf_desc_page_alloc(struct nbpf_channel *chan)
{
struct dma_chan *dchan = &chan->dma_chan;
struct nbpf_desc_page *dpage = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
struct nbpf_link_desc *ldesc;
struct nbpf_link_reg *hwdesc;
struct nbpf_desc *desc;
LIST_HEAD(head);
LIST_HEAD(lhead);
int i;
struct device *dev = dchan->device->dev;
if (!dpage)
return -ENOMEM;
dev_dbg(dev, "%s(): alloc %lu descriptors, %lu segments, total alloc %zu\n",
__func__, NBPF_DESCS_PER_PAGE, NBPF_SEGMENTS_PER_PAGE, sizeof(*dpage));
for (i = 0, ldesc = dpage->ldesc, hwdesc = dpage->hwdesc;
i < ARRAY_SIZE(dpage->ldesc);
i++, ldesc++, hwdesc++) {
ldesc->hwdesc = hwdesc;
list_add_tail(&ldesc->node, &lhead);
ldesc->hwdesc_dma_addr = dma_map_single(dchan->device->dev,
hwdesc, sizeof(*hwdesc), DMA_TO_DEVICE);
dev_dbg(dev, "%s(): mapped 0x%p to %pad\n", __func__,
hwdesc, &ldesc->hwdesc_dma_addr);
}
for (i = 0, desc = dpage->desc;
i < ARRAY_SIZE(dpage->desc);
i++, desc++) {
dma_async_tx_descriptor_init(&desc->async_tx, dchan);
desc->async_tx.tx_submit = nbpf_tx_submit;
desc->chan = chan;
INIT_LIST_HEAD(&desc->sg);
list_add_tail(&desc->node, &head);
}
/*
* This function cannot be called from interrupt context, so, no need to
* save flags
*/
spin_lock_irq(&chan->lock);
list_splice_tail(&lhead, &chan->free_links);
list_splice_tail(&head, &chan->free);
list_add(&dpage->node, &chan->desc_page);
spin_unlock_irq(&chan->lock);
return ARRAY_SIZE(dpage->desc);
}
static void nbpf_desc_put(struct nbpf_desc *desc)
{
struct nbpf_channel *chan = desc->chan;
struct nbpf_link_desc *ldesc, *tmp;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
list_for_each_entry_safe(ldesc, tmp, &desc->sg, node)
list_move(&ldesc->node, &chan->free_links);
list_add(&desc->node, &chan->free);
spin_unlock_irqrestore(&chan->lock, flags);
}
static void nbpf_scan_acked(struct nbpf_channel *chan)
{
struct nbpf_desc *desc, *tmp;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&chan->lock, flags);
list_for_each_entry_safe(desc, tmp, &chan->done, node)
if (async_tx_test_ack(&desc->async_tx) && desc->user_wait) {
list_move(&desc->node, &head);
desc->user_wait = false;
}
spin_unlock_irqrestore(&chan->lock, flags);
list_for_each_entry_safe(desc, tmp, &head, node) {
list_del(&desc->node);
nbpf_desc_put(desc);
}
}
/*
* We have to allocate descriptors with the channel lock dropped. This means,
* before we re-acquire the lock buffers can be taken already, so we have to
* re-check after re-acquiring the lock and possibly retry, if buffers are gone
* again.
*/
static struct nbpf_desc *nbpf_desc_get(struct nbpf_channel *chan, size_t len)
{
struct nbpf_desc *desc = NULL;
struct nbpf_link_desc *ldesc, *prev = NULL;
nbpf_scan_acked(chan);
spin_lock_irq(&chan->lock);
do {
int i = 0, ret;
if (list_empty(&chan->free)) {
/* No more free descriptors */
spin_unlock_irq(&chan->lock);
ret = nbpf_desc_page_alloc(chan);
if (ret < 0)
return NULL;
spin_lock_irq(&chan->lock);
continue;
}
desc = list_first_entry(&chan->free, struct nbpf_desc, node);
list_del(&desc->node);
do {
if (list_empty(&chan->free_links)) {
/* No more free link descriptors */
spin_unlock_irq(&chan->lock);
ret = nbpf_desc_page_alloc(chan);
if (ret < 0) {
nbpf_desc_put(desc);
return NULL;
}
spin_lock_irq(&chan->lock);
continue;
}
ldesc = list_first_entry(&chan->free_links,
struct nbpf_link_desc, node);
ldesc->desc = desc;
if (prev)
prev->hwdesc->next = (u32)ldesc->hwdesc_dma_addr;
prev = ldesc;
list_move_tail(&ldesc->node, &desc->sg);
i++;
} while (i < len);
} while (!desc);
prev->hwdesc->next = 0;
spin_unlock_irq(&chan->lock);
return desc;
}
static void nbpf_chan_idle(struct nbpf_channel *chan)
{
struct nbpf_desc *desc, *tmp;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&chan->lock, flags);
list_splice_init(&chan->done, &head);
list_splice_init(&chan->active, &head);
list_splice_init(&chan->queued, &head);
chan->running = NULL;
spin_unlock_irqrestore(&chan->lock, flags);
list_for_each_entry_safe(desc, tmp, &head, node) {
dev_dbg(chan->nbpf->dma_dev.dev, "%s(): force-free desc %p cookie %d\n",
__func__, desc, desc->async_tx.cookie);
list_del(&desc->node);
nbpf_desc_put(desc);
}
}
static int nbpf_pause(struct dma_chan *dchan)
{
struct nbpf_channel *chan = nbpf_to_chan(dchan);
dev_dbg(dchan->device->dev, "Entry %s\n", __func__);
chan->paused = true;
nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_SETSUS);
/* See comment in nbpf_prep_one() */
nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_CLREN);
return 0;
}
static int nbpf_terminate_all(struct dma_chan *dchan)
{
struct nbpf_channel *chan = nbpf_to_chan(dchan);
dev_dbg(dchan->device->dev, "Entry %s\n", __func__);
dev_dbg(dchan->device->dev, "Terminating\n");
nbpf_chan_halt(chan);
nbpf_chan_idle(chan);
return 0;
}
static int nbpf_config(struct dma_chan *dchan,
struct dma_slave_config *config)
{
struct nbpf_channel *chan = nbpf_to_chan(dchan);
dev_dbg(dchan->device->dev, "Entry %s\n", __func__);
/*
* We could check config->slave_id to match chan->terminal here,
* but with DT they would be coming from the same source, so
* such a check would be superflous
*/
chan->slave_dst_addr = config->dst_addr;
chan->slave_dst_width = nbpf_xfer_size(chan->nbpf,
config->dst_addr_width, 1);
chan->slave_dst_burst = nbpf_xfer_size(chan->nbpf,
config->dst_addr_width,
config->dst_maxburst);
chan->slave_src_addr = config->src_addr;
chan->slave_src_width = nbpf_xfer_size(chan->nbpf,
config->src_addr_width, 1);
chan->slave_src_burst = nbpf_xfer_size(chan->nbpf,
config->src_addr_width,
config->src_maxburst);
return 0;
}
static struct dma_async_tx_descriptor *nbpf_prep_sg(struct nbpf_channel *chan,
struct scatterlist *src_sg, struct scatterlist *dst_sg,
size_t len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct nbpf_link_desc *ldesc;
struct scatterlist *mem_sg;
struct nbpf_desc *desc;
bool inc_src, inc_dst;
size_t data_len = 0;
int i = 0;
switch (direction) {
case DMA_DEV_TO_MEM:
mem_sg = dst_sg;
inc_src = false;
inc_dst = true;
break;
case DMA_MEM_TO_DEV:
mem_sg = src_sg;
inc_src = true;
inc_dst = false;
break;
default:
case DMA_MEM_TO_MEM:
mem_sg = src_sg;
inc_src = true;
inc_dst = true;
}
desc = nbpf_desc_get(chan, len);
if (!desc)
return NULL;
desc->async_tx.flags = flags;
desc->async_tx.cookie = -EBUSY;
desc->user_wait = false;
/*
* This is a private descriptor list, and we own the descriptor. No need
* to lock.
*/
list_for_each_entry(ldesc, &desc->sg, node) {
int ret = nbpf_prep_one(ldesc, direction,
sg_dma_address(src_sg),
sg_dma_address(dst_sg),
sg_dma_len(mem_sg),
i == len - 1);
if (ret < 0) {
nbpf_desc_put(desc);
return NULL;
}
data_len += sg_dma_len(mem_sg);
if (inc_src)
src_sg = sg_next(src_sg);
if (inc_dst)
dst_sg = sg_next(dst_sg);
mem_sg = direction == DMA_DEV_TO_MEM ? dst_sg : src_sg;
i++;
}
desc->length = data_len;
/* The user has to return the descriptor to us ASAP via .tx_submit() */
return &desc->async_tx;
}
static struct dma_async_tx_descriptor *nbpf_prep_memcpy(
struct dma_chan *dchan, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct nbpf_channel *chan = nbpf_to_chan(dchan);
struct scatterlist dst_sg;
struct scatterlist src_sg;
sg_init_table(&dst_sg, 1);
sg_init_table(&src_sg, 1);
sg_dma_address(&dst_sg) = dst;
sg_dma_address(&src_sg) = src;
sg_dma_len(&dst_sg) = len;
sg_dma_len(&src_sg) = len;
dev_dbg(dchan->device->dev, "%s(): %zu @ %pad -> %pad\n",
__func__, len, &src, &dst);
return nbpf_prep_sg(chan, &src_sg, &dst_sg, 1,
DMA_MEM_TO_MEM, flags);
}
static struct dma_async_tx_descriptor *nbpf_prep_slave_sg(
struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long flags, void *context)
{
struct nbpf_channel *chan = nbpf_to_chan(dchan);
struct scatterlist slave_sg;
dev_dbg(dchan->device->dev, "Entry %s()\n", __func__);
sg_init_table(&slave_sg, 1);
switch (direction) {
case DMA_MEM_TO_DEV:
sg_dma_address(&slave_sg) = chan->slave_dst_addr;
return nbpf_prep_sg(chan, sgl, &slave_sg, sg_len,
direction, flags);
case DMA_DEV_TO_MEM:
sg_dma_address(&slave_sg) = chan->slave_src_addr;
return nbpf_prep_sg(chan, &slave_sg, sgl, sg_len,
direction, flags);
default:
return NULL;
}
}
static int nbpf_alloc_chan_resources(struct dma_chan *dchan)
{
struct nbpf_channel *chan = nbpf_to_chan(dchan);
int ret;
INIT_LIST_HEAD(&chan->free);
INIT_LIST_HEAD(&chan->free_links);
INIT_LIST_HEAD(&chan->queued);
INIT_LIST_HEAD(&chan->active);
INIT_LIST_HEAD(&chan->done);
ret = nbpf_desc_page_alloc(chan);
if (ret < 0)
return ret;
dev_dbg(dchan->device->dev, "Entry %s(): terminal %u\n", __func__,
chan->terminal);
nbpf_chan_configure(chan);
return ret;
}
static void nbpf_free_chan_resources(struct dma_chan *dchan)
{
struct nbpf_channel *chan = nbpf_to_chan(dchan);
struct nbpf_desc_page *dpage, *tmp;
dev_dbg(dchan->device->dev, "Entry %s()\n", __func__);
nbpf_chan_halt(chan);
nbpf_chan_idle(chan);
/* Clean up for if a channel is re-used for MEMCPY after slave DMA */
nbpf_chan_prepare_default(chan);
list_for_each_entry_safe(dpage, tmp, &chan->desc_page, node) {
struct nbpf_link_desc *ldesc;
int i;
list_del(&dpage->node);
for (i = 0, ldesc = dpage->ldesc;
i < ARRAY_SIZE(dpage->ldesc);
i++, ldesc++)
dma_unmap_single(dchan->device->dev, ldesc->hwdesc_dma_addr,
sizeof(*ldesc->hwdesc), DMA_TO_DEVICE);
free_page((unsigned long)dpage);
}
}
static struct dma_chan *nbpf_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct nbpf_device *nbpf = ofdma->of_dma_data;
struct dma_chan *dchan;
struct nbpf_channel *chan;
if (dma_spec->args_count != 2)
return NULL;
dchan = dma_get_any_slave_channel(&nbpf->dma_dev);
if (!dchan)
return NULL;
dev_dbg(dchan->device->dev, "Entry %s(%pOFn)\n", __func__,
dma_spec->np);
chan = nbpf_to_chan(dchan);
chan->terminal = dma_spec->args[0];
chan->flags = dma_spec->args[1];
nbpf_chan_prepare(chan);
nbpf_chan_configure(chan);
return dchan;
}
static void nbpf_chan_tasklet(struct tasklet_struct *t)
{
struct nbpf_channel *chan = from_tasklet(chan, t, tasklet);
struct nbpf_desc *desc, *tmp;
struct dmaengine_desc_callback cb;
while (!list_empty(&chan->done)) {
bool found = false, must_put, recycling = false;
spin_lock_irq(&chan->lock);
list_for_each_entry_safe(desc, tmp, &chan->done, node) {
if (!desc->user_wait) {
/* Newly completed descriptor, have to process */
found = true;
break;
} else if (async_tx_test_ack(&desc->async_tx)) {
/*
* This descriptor was waiting for a user ACK,
* it can be recycled now.
*/
list_del(&desc->node);
spin_unlock_irq(&chan->lock);
nbpf_desc_put(desc);
recycling = true;
break;
}
}
if (recycling)
continue;
if (!found) {
/* This can happen if TERMINATE_ALL has been called */
spin_unlock_irq(&chan->lock);
break;
}
dma_cookie_complete(&desc->async_tx);
/*
* With released lock we cannot dereference desc, maybe it's
* still on the "done" list
*/
if (async_tx_test_ack(&desc->async_tx)) {
list_del(&desc->node);
must_put = true;
} else {
desc->user_wait = true;
must_put = false;
}
dmaengine_desc_get_callback(&desc->async_tx, &cb);
/* ack and callback completed descriptor */
spin_unlock_irq(&chan->lock);
dmaengine_desc_callback_invoke(&cb, NULL);
if (must_put)
nbpf_desc_put(desc);
}
}
static irqreturn_t nbpf_chan_irq(int irq, void *dev)
{
struct nbpf_channel *chan = dev;
bool done = nbpf_status_get(chan);
struct nbpf_desc *desc;
irqreturn_t ret;
bool bh = false;
if (!done)
return IRQ_NONE;
nbpf_status_ack(chan);
dev_dbg(&chan->dma_chan.dev->device, "%s()\n", __func__);
spin_lock(&chan->lock);
desc = chan->running;
if (WARN_ON(!desc)) {
ret = IRQ_NONE;
goto unlock;
} else {
ret = IRQ_HANDLED;
bh = true;
}
list_move_tail(&desc->node, &chan->done);
chan->running = NULL;
if (!list_empty(&chan->active)) {
desc = list_first_entry(&chan->active,
struct nbpf_desc, node);
if (!nbpf_start(desc))
chan->running = desc;
}
unlock:
spin_unlock(&chan->lock);
if (bh)
tasklet_schedule(&chan->tasklet);
return ret;
}
static irqreturn_t nbpf_err_irq(int irq, void *dev)
{
struct nbpf_device *nbpf = dev;
u32 error = nbpf_error_get(nbpf);
dev_warn(nbpf->dma_dev.dev, "DMA error IRQ %u\n", irq);
if (!error)
return IRQ_NONE;
do {
struct nbpf_channel *chan = nbpf_error_get_channel(nbpf, error);
/* On error: abort all queued transfers, no callback */
nbpf_error_clear(chan);
nbpf_chan_idle(chan);
error = nbpf_error_get(nbpf);
} while (error);
return IRQ_HANDLED;
}
static int nbpf_chan_probe(struct nbpf_device *nbpf, int n)
{
struct dma_device *dma_dev = &nbpf->dma_dev;
struct nbpf_channel *chan = nbpf->chan + n;
int ret;
chan->nbpf = nbpf;
chan->base = nbpf->base + NBPF_REG_CHAN_OFFSET + NBPF_REG_CHAN_SIZE * n;
INIT_LIST_HEAD(&chan->desc_page);
spin_lock_init(&chan->lock);
chan->dma_chan.device = dma_dev;
dma_cookie_init(&chan->dma_chan);
nbpf_chan_prepare_default(chan);
dev_dbg(dma_dev->dev, "%s(): channel %d: -> %p\n", __func__, n, chan->base);
snprintf(chan->name, sizeof(chan->name), "nbpf %d", n);
tasklet_setup(&chan->tasklet, nbpf_chan_tasklet);
ret = devm_request_irq(dma_dev->dev, chan->irq,
nbpf_chan_irq, IRQF_SHARED,
chan->name, chan);
if (ret < 0)
return ret;
/* Add the channel to DMA device channel list */
list_add_tail(&chan->dma_chan.device_node,
&dma_dev->channels);
return 0;
}
static const struct of_device_id nbpf_match[] = {
{.compatible = "renesas,nbpfaxi64dmac1b4", .data = &nbpf_cfg[NBPF1B4]},
{.compatible = "renesas,nbpfaxi64dmac1b8", .data = &nbpf_cfg[NBPF1B8]},
{.compatible = "renesas,nbpfaxi64dmac1b16", .data = &nbpf_cfg[NBPF1B16]},
{.compatible = "renesas,nbpfaxi64dmac4b4", .data = &nbpf_cfg[NBPF4B4]},
{.compatible = "renesas,nbpfaxi64dmac4b8", .data = &nbpf_cfg[NBPF4B8]},
{.compatible = "renesas,nbpfaxi64dmac4b16", .data = &nbpf_cfg[NBPF4B16]},
{.compatible = "renesas,nbpfaxi64dmac8b4", .data = &nbpf_cfg[NBPF8B4]},
{.compatible = "renesas,nbpfaxi64dmac8b8", .data = &nbpf_cfg[NBPF8B8]},
{.compatible = "renesas,nbpfaxi64dmac8b16", .data = &nbpf_cfg[NBPF8B16]},
{}
};
MODULE_DEVICE_TABLE(of, nbpf_match);
static int nbpf_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct nbpf_device *nbpf;
struct dma_device *dma_dev;
const struct nbpf_config *cfg;
int num_channels;
int ret, irq, eirq, i;
int irqbuf[9] /* maximum 8 channels + error IRQ */;
unsigned int irqs = 0;
BUILD_BUG_ON(sizeof(struct nbpf_desc_page) > PAGE_SIZE);
/* DT only */
if (!np)
return -ENODEV;
cfg = of_device_get_match_data(dev);
num_channels = cfg->num_channels;
nbpf = devm_kzalloc(dev, struct_size(nbpf, chan, num_channels),
GFP_KERNEL);
if (!nbpf)
return -ENOMEM;
dma_dev = &nbpf->dma_dev;
dma_dev->dev = dev;
nbpf->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(nbpf->base))
return PTR_ERR(nbpf->base);
nbpf->clk = devm_clk_get(dev, NULL);
if (IS_ERR(nbpf->clk))
return PTR_ERR(nbpf->clk);
of_property_read_u32(np, "max-burst-mem-read",
&nbpf->max_burst_mem_read);
of_property_read_u32(np, "max-burst-mem-write",
&nbpf->max_burst_mem_write);
nbpf->config = cfg;
for (i = 0; irqs < ARRAY_SIZE(irqbuf); i++) {
irq = platform_get_irq_optional(pdev, i);
if (irq < 0 && irq != -ENXIO)
return irq;
if (irq > 0)
irqbuf[irqs++] = irq;
}
/*
* 3 IRQ resource schemes are supported:
* 1. 1 shared IRQ for error and all channels
* 2. 2 IRQs: one for error and one shared for all channels
* 3. 1 IRQ for error and an own IRQ for each channel
*/
if (irqs != 1 && irqs != 2 && irqs != num_channels + 1)
return -ENXIO;
if (irqs == 1) {
eirq = irqbuf[0];
for (i = 0; i <= num_channels; i++)
nbpf->chan[i].irq = irqbuf[0];
} else {
eirq = platform_get_irq_byname(pdev, "error");
if (eirq < 0)
return eirq;
if (irqs == num_channels + 1) {
struct nbpf_channel *chan;
for (i = 0, chan = nbpf->chan; i <= num_channels;
i++, chan++) {
/* Skip the error IRQ */
if (irqbuf[i] == eirq)
i++;
chan->irq = irqbuf[i];
}
if (chan != nbpf->chan + num_channels)
return -EINVAL;
} else {
/* 2 IRQs and more than one channel */
if (irqbuf[0] == eirq)
irq = irqbuf[1];
else
irq = irqbuf[0];
for (i = 0; i <= num_channels; i++)
nbpf->chan[i].irq = irq;
}
}
ret = devm_request_irq(dev, eirq, nbpf_err_irq,
IRQF_SHARED, "dma error", nbpf);
if (ret < 0)
return ret;
nbpf->eirq = eirq;
INIT_LIST_HEAD(&dma_dev->channels);
/* Create DMA Channel */
for (i = 0; i < num_channels; i++) {
ret = nbpf_chan_probe(nbpf, i);
if (ret < 0)
return ret;
}
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
/* Common and MEMCPY operations */
dma_dev->device_alloc_chan_resources
= nbpf_alloc_chan_resources;
dma_dev->device_free_chan_resources = nbpf_free_chan_resources;
dma_dev->device_prep_dma_memcpy = nbpf_prep_memcpy;
dma_dev->device_tx_status = nbpf_tx_status;
dma_dev->device_issue_pending = nbpf_issue_pending;
/*
* If we drop support for unaligned MEMCPY buffer addresses and / or
* lengths by setting
* dma_dev->copy_align = 4;
* then we can set transfer length to 4 bytes in nbpf_prep_one() for
* DMA_MEM_TO_MEM
*/
/* Compulsory for DMA_SLAVE fields */
dma_dev->device_prep_slave_sg = nbpf_prep_slave_sg;
dma_dev->device_config = nbpf_config;
dma_dev->device_pause = nbpf_pause;
dma_dev->device_terminate_all = nbpf_terminate_all;
dma_dev->src_addr_widths = NBPF_DMA_BUSWIDTHS;
dma_dev->dst_addr_widths = NBPF_DMA_BUSWIDTHS;
dma_dev->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
platform_set_drvdata(pdev, nbpf);
ret = clk_prepare_enable(nbpf->clk);
if (ret < 0)
return ret;
nbpf_configure(nbpf);
ret = dma_async_device_register(dma_dev);
if (ret < 0)
goto e_clk_off;
ret = of_dma_controller_register(np, nbpf_of_xlate, nbpf);
if (ret < 0)
goto e_dma_dev_unreg;
return 0;
e_dma_dev_unreg:
dma_async_device_unregister(dma_dev);
e_clk_off:
clk_disable_unprepare(nbpf->clk);
return ret;
}
static int nbpf_remove(struct platform_device *pdev)
{
struct nbpf_device *nbpf = platform_get_drvdata(pdev);
int i;
devm_free_irq(&pdev->dev, nbpf->eirq, nbpf);
for (i = 0; i < nbpf->config->num_channels; i++) {
struct nbpf_channel *chan = nbpf->chan + i;
devm_free_irq(&pdev->dev, chan->irq, chan);
tasklet_kill(&chan->tasklet);
}
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&nbpf->dma_dev);
clk_disable_unprepare(nbpf->clk);
return 0;
}
static const struct platform_device_id nbpf_ids[] = {
{"nbpfaxi64dmac1b4", (kernel_ulong_t)&nbpf_cfg[NBPF1B4]},
{"nbpfaxi64dmac1b8", (kernel_ulong_t)&nbpf_cfg[NBPF1B8]},
{"nbpfaxi64dmac1b16", (kernel_ulong_t)&nbpf_cfg[NBPF1B16]},
{"nbpfaxi64dmac4b4", (kernel_ulong_t)&nbpf_cfg[NBPF4B4]},
{"nbpfaxi64dmac4b8", (kernel_ulong_t)&nbpf_cfg[NBPF4B8]},
{"nbpfaxi64dmac4b16", (kernel_ulong_t)&nbpf_cfg[NBPF4B16]},
{"nbpfaxi64dmac8b4", (kernel_ulong_t)&nbpf_cfg[NBPF8B4]},
{"nbpfaxi64dmac8b8", (kernel_ulong_t)&nbpf_cfg[NBPF8B8]},
{"nbpfaxi64dmac8b16", (kernel_ulong_t)&nbpf_cfg[NBPF8B16]},
{},
};
MODULE_DEVICE_TABLE(platform, nbpf_ids);
#ifdef CONFIG_PM
static int nbpf_runtime_suspend(struct device *dev)
{
struct nbpf_device *nbpf = dev_get_drvdata(dev);
clk_disable_unprepare(nbpf->clk);
return 0;
}
static int nbpf_runtime_resume(struct device *dev)
{
struct nbpf_device *nbpf = dev_get_drvdata(dev);
return clk_prepare_enable(nbpf->clk);
}
#endif
static const struct dev_pm_ops nbpf_pm_ops = {
SET_RUNTIME_PM_OPS(nbpf_runtime_suspend, nbpf_runtime_resume, NULL)
};
static struct platform_driver nbpf_driver = {
.driver = {
.name = "dma-nbpf",
.of_match_table = nbpf_match,
.pm = &nbpf_pm_ops,
},
.id_table = nbpf_ids,
.probe = nbpf_probe,
.remove = nbpf_remove,
};
module_platform_driver(nbpf_driver);
MODULE_AUTHOR("Guennadi Liakhovetski <[email protected]>");
MODULE_DESCRIPTION("dmaengine driver for NBPFAXI64* DMACs");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/nbpfaxi.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for the Analog Devices AXI-DMAC core
*
* Copyright 2013-2019 Analog Devices Inc.
* Author: Lars-Peter Clausen <[email protected]>
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/fpga/adi-axi-common.h>
#include <dt-bindings/dma/axi-dmac.h>
#include "dmaengine.h"
#include "virt-dma.h"
/*
* The AXI-DMAC is a soft IP core that is used in FPGA designs. The core has
* various instantiation parameters which decided the exact feature set support
* by the core.
*
* Each channel of the core has a source interface and a destination interface.
* The number of channels and the type of the channel interfaces is selected at
* configuration time. A interface can either be a connected to a central memory
* interconnect, which allows access to system memory, or it can be connected to
* a dedicated bus which is directly connected to a data port on a peripheral.
* Given that those are configuration options of the core that are selected when
* it is instantiated this means that they can not be changed by software at
* runtime. By extension this means that each channel is uni-directional. It can
* either be device to memory or memory to device, but not both. Also since the
* device side is a dedicated data bus only connected to a single peripheral
* there is no address than can or needs to be configured for the device side.
*/
#define AXI_DMAC_REG_INTERFACE_DESC 0x10
#define AXI_DMAC_DMA_SRC_TYPE_MSK GENMASK(13, 12)
#define AXI_DMAC_DMA_SRC_TYPE_GET(x) FIELD_GET(AXI_DMAC_DMA_SRC_TYPE_MSK, x)
#define AXI_DMAC_DMA_SRC_WIDTH_MSK GENMASK(11, 8)
#define AXI_DMAC_DMA_SRC_WIDTH_GET(x) FIELD_GET(AXI_DMAC_DMA_SRC_WIDTH_MSK, x)
#define AXI_DMAC_DMA_DST_TYPE_MSK GENMASK(5, 4)
#define AXI_DMAC_DMA_DST_TYPE_GET(x) FIELD_GET(AXI_DMAC_DMA_DST_TYPE_MSK, x)
#define AXI_DMAC_DMA_DST_WIDTH_MSK GENMASK(3, 0)
#define AXI_DMAC_DMA_DST_WIDTH_GET(x) FIELD_GET(AXI_DMAC_DMA_DST_WIDTH_MSK, x)
#define AXI_DMAC_REG_COHERENCY_DESC 0x14
#define AXI_DMAC_DST_COHERENT_MSK BIT(0)
#define AXI_DMAC_DST_COHERENT_GET(x) FIELD_GET(AXI_DMAC_DST_COHERENT_MSK, x)
#define AXI_DMAC_REG_IRQ_MASK 0x80
#define AXI_DMAC_REG_IRQ_PENDING 0x84
#define AXI_DMAC_REG_IRQ_SOURCE 0x88
#define AXI_DMAC_REG_CTRL 0x400
#define AXI_DMAC_REG_TRANSFER_ID 0x404
#define AXI_DMAC_REG_START_TRANSFER 0x408
#define AXI_DMAC_REG_FLAGS 0x40c
#define AXI_DMAC_REG_DEST_ADDRESS 0x410
#define AXI_DMAC_REG_SRC_ADDRESS 0x414
#define AXI_DMAC_REG_X_LENGTH 0x418
#define AXI_DMAC_REG_Y_LENGTH 0x41c
#define AXI_DMAC_REG_DEST_STRIDE 0x420
#define AXI_DMAC_REG_SRC_STRIDE 0x424
#define AXI_DMAC_REG_TRANSFER_DONE 0x428
#define AXI_DMAC_REG_ACTIVE_TRANSFER_ID 0x42c
#define AXI_DMAC_REG_STATUS 0x430
#define AXI_DMAC_REG_CURRENT_SRC_ADDR 0x434
#define AXI_DMAC_REG_CURRENT_DEST_ADDR 0x438
#define AXI_DMAC_REG_PARTIAL_XFER_LEN 0x44c
#define AXI_DMAC_REG_PARTIAL_XFER_ID 0x450
#define AXI_DMAC_CTRL_ENABLE BIT(0)
#define AXI_DMAC_CTRL_PAUSE BIT(1)
#define AXI_DMAC_IRQ_SOT BIT(0)
#define AXI_DMAC_IRQ_EOT BIT(1)
#define AXI_DMAC_FLAG_CYCLIC BIT(0)
#define AXI_DMAC_FLAG_LAST BIT(1)
#define AXI_DMAC_FLAG_PARTIAL_REPORT BIT(2)
#define AXI_DMAC_FLAG_PARTIAL_XFER_DONE BIT(31)
/* The maximum ID allocated by the hardware is 31 */
#define AXI_DMAC_SG_UNUSED 32U
struct axi_dmac_sg {
dma_addr_t src_addr;
dma_addr_t dest_addr;
unsigned int x_len;
unsigned int y_len;
unsigned int dest_stride;
unsigned int src_stride;
unsigned int id;
unsigned int partial_len;
bool schedule_when_free;
};
struct axi_dmac_desc {
struct virt_dma_desc vdesc;
bool cyclic;
bool have_partial_xfer;
unsigned int num_submitted;
unsigned int num_completed;
unsigned int num_sgs;
struct axi_dmac_sg sg[];
};
struct axi_dmac_chan {
struct virt_dma_chan vchan;
struct axi_dmac_desc *next_desc;
struct list_head active_descs;
enum dma_transfer_direction direction;
unsigned int src_width;
unsigned int dest_width;
unsigned int src_type;
unsigned int dest_type;
unsigned int max_length;
unsigned int address_align_mask;
unsigned int length_align_mask;
bool hw_partial_xfer;
bool hw_cyclic;
bool hw_2d;
};
struct axi_dmac {
void __iomem *base;
int irq;
struct clk *clk;
struct dma_device dma_dev;
struct axi_dmac_chan chan;
};
static struct axi_dmac *chan_to_axi_dmac(struct axi_dmac_chan *chan)
{
return container_of(chan->vchan.chan.device, struct axi_dmac,
dma_dev);
}
static struct axi_dmac_chan *to_axi_dmac_chan(struct dma_chan *c)
{
return container_of(c, struct axi_dmac_chan, vchan.chan);
}
static struct axi_dmac_desc *to_axi_dmac_desc(struct virt_dma_desc *vdesc)
{
return container_of(vdesc, struct axi_dmac_desc, vdesc);
}
static void axi_dmac_write(struct axi_dmac *axi_dmac, unsigned int reg,
unsigned int val)
{
writel(val, axi_dmac->base + reg);
}
static int axi_dmac_read(struct axi_dmac *axi_dmac, unsigned int reg)
{
return readl(axi_dmac->base + reg);
}
static int axi_dmac_src_is_mem(struct axi_dmac_chan *chan)
{
return chan->src_type == AXI_DMAC_BUS_TYPE_AXI_MM;
}
static int axi_dmac_dest_is_mem(struct axi_dmac_chan *chan)
{
return chan->dest_type == AXI_DMAC_BUS_TYPE_AXI_MM;
}
static bool axi_dmac_check_len(struct axi_dmac_chan *chan, unsigned int len)
{
if (len == 0)
return false;
if ((len & chan->length_align_mask) != 0) /* Not aligned */
return false;
return true;
}
static bool axi_dmac_check_addr(struct axi_dmac_chan *chan, dma_addr_t addr)
{
if ((addr & chan->address_align_mask) != 0) /* Not aligned */
return false;
return true;
}
static void axi_dmac_start_transfer(struct axi_dmac_chan *chan)
{
struct axi_dmac *dmac = chan_to_axi_dmac(chan);
struct virt_dma_desc *vdesc;
struct axi_dmac_desc *desc;
struct axi_dmac_sg *sg;
unsigned int flags = 0;
unsigned int val;
val = axi_dmac_read(dmac, AXI_DMAC_REG_START_TRANSFER);
if (val) /* Queue is full, wait for the next SOT IRQ */
return;
desc = chan->next_desc;
if (!desc) {
vdesc = vchan_next_desc(&chan->vchan);
if (!vdesc)
return;
list_move_tail(&vdesc->node, &chan->active_descs);
desc = to_axi_dmac_desc(vdesc);
}
sg = &desc->sg[desc->num_submitted];
/* Already queued in cyclic mode. Wait for it to finish */
if (sg->id != AXI_DMAC_SG_UNUSED) {
sg->schedule_when_free = true;
return;
}
desc->num_submitted++;
if (desc->num_submitted == desc->num_sgs ||
desc->have_partial_xfer) {
if (desc->cyclic)
desc->num_submitted = 0; /* Start again */
else
chan->next_desc = NULL;
flags |= AXI_DMAC_FLAG_LAST;
} else {
chan->next_desc = desc;
}
sg->id = axi_dmac_read(dmac, AXI_DMAC_REG_TRANSFER_ID);
if (axi_dmac_dest_is_mem(chan)) {
axi_dmac_write(dmac, AXI_DMAC_REG_DEST_ADDRESS, sg->dest_addr);
axi_dmac_write(dmac, AXI_DMAC_REG_DEST_STRIDE, sg->dest_stride);
}
if (axi_dmac_src_is_mem(chan)) {
axi_dmac_write(dmac, AXI_DMAC_REG_SRC_ADDRESS, sg->src_addr);
axi_dmac_write(dmac, AXI_DMAC_REG_SRC_STRIDE, sg->src_stride);
}
/*
* If the hardware supports cyclic transfers and there is no callback to
* call and only a single segment, enable hw cyclic mode to avoid
* unnecessary interrupts.
*/
if (chan->hw_cyclic && desc->cyclic && !desc->vdesc.tx.callback &&
desc->num_sgs == 1)
flags |= AXI_DMAC_FLAG_CYCLIC;
if (chan->hw_partial_xfer)
flags |= AXI_DMAC_FLAG_PARTIAL_REPORT;
axi_dmac_write(dmac, AXI_DMAC_REG_X_LENGTH, sg->x_len - 1);
axi_dmac_write(dmac, AXI_DMAC_REG_Y_LENGTH, sg->y_len - 1);
axi_dmac_write(dmac, AXI_DMAC_REG_FLAGS, flags);
axi_dmac_write(dmac, AXI_DMAC_REG_START_TRANSFER, 1);
}
static struct axi_dmac_desc *axi_dmac_active_desc(struct axi_dmac_chan *chan)
{
return list_first_entry_or_null(&chan->active_descs,
struct axi_dmac_desc, vdesc.node);
}
static inline unsigned int axi_dmac_total_sg_bytes(struct axi_dmac_chan *chan,
struct axi_dmac_sg *sg)
{
if (chan->hw_2d)
return sg->x_len * sg->y_len;
else
return sg->x_len;
}
static void axi_dmac_dequeue_partial_xfers(struct axi_dmac_chan *chan)
{
struct axi_dmac *dmac = chan_to_axi_dmac(chan);
struct axi_dmac_desc *desc;
struct axi_dmac_sg *sg;
u32 xfer_done, len, id, i;
bool found_sg;
do {
len = axi_dmac_read(dmac, AXI_DMAC_REG_PARTIAL_XFER_LEN);
id = axi_dmac_read(dmac, AXI_DMAC_REG_PARTIAL_XFER_ID);
found_sg = false;
list_for_each_entry(desc, &chan->active_descs, vdesc.node) {
for (i = 0; i < desc->num_sgs; i++) {
sg = &desc->sg[i];
if (sg->id == AXI_DMAC_SG_UNUSED)
continue;
if (sg->id == id) {
desc->have_partial_xfer = true;
sg->partial_len = len;
found_sg = true;
break;
}
}
if (found_sg)
break;
}
if (found_sg) {
dev_dbg(dmac->dma_dev.dev,
"Found partial segment id=%u, len=%u\n",
id, len);
} else {
dev_warn(dmac->dma_dev.dev,
"Not found partial segment id=%u, len=%u\n",
id, len);
}
/* Check if we have any more partial transfers */
xfer_done = axi_dmac_read(dmac, AXI_DMAC_REG_TRANSFER_DONE);
xfer_done = !(xfer_done & AXI_DMAC_FLAG_PARTIAL_XFER_DONE);
} while (!xfer_done);
}
static void axi_dmac_compute_residue(struct axi_dmac_chan *chan,
struct axi_dmac_desc *active)
{
struct dmaengine_result *rslt = &active->vdesc.tx_result;
unsigned int start = active->num_completed - 1;
struct axi_dmac_sg *sg;
unsigned int i, total;
rslt->result = DMA_TRANS_NOERROR;
rslt->residue = 0;
/*
* We get here if the last completed segment is partial, which
* means we can compute the residue from that segment onwards
*/
for (i = start; i < active->num_sgs; i++) {
sg = &active->sg[i];
total = axi_dmac_total_sg_bytes(chan, sg);
rslt->residue += (total - sg->partial_len);
}
}
static bool axi_dmac_transfer_done(struct axi_dmac_chan *chan,
unsigned int completed_transfers)
{
struct axi_dmac_desc *active;
struct axi_dmac_sg *sg;
bool start_next = false;
active = axi_dmac_active_desc(chan);
if (!active)
return false;
if (chan->hw_partial_xfer &&
(completed_transfers & AXI_DMAC_FLAG_PARTIAL_XFER_DONE))
axi_dmac_dequeue_partial_xfers(chan);
do {
sg = &active->sg[active->num_completed];
if (sg->id == AXI_DMAC_SG_UNUSED) /* Not yet submitted */
break;
if (!(BIT(sg->id) & completed_transfers))
break;
active->num_completed++;
sg->id = AXI_DMAC_SG_UNUSED;
if (sg->schedule_when_free) {
sg->schedule_when_free = false;
start_next = true;
}
if (sg->partial_len)
axi_dmac_compute_residue(chan, active);
if (active->cyclic)
vchan_cyclic_callback(&active->vdesc);
if (active->num_completed == active->num_sgs ||
sg->partial_len) {
if (active->cyclic) {
active->num_completed = 0; /* wrap around */
} else {
list_del(&active->vdesc.node);
vchan_cookie_complete(&active->vdesc);
active = axi_dmac_active_desc(chan);
}
}
} while (active);
return start_next;
}
static irqreturn_t axi_dmac_interrupt_handler(int irq, void *devid)
{
struct axi_dmac *dmac = devid;
unsigned int pending;
bool start_next = false;
pending = axi_dmac_read(dmac, AXI_DMAC_REG_IRQ_PENDING);
if (!pending)
return IRQ_NONE;
axi_dmac_write(dmac, AXI_DMAC_REG_IRQ_PENDING, pending);
spin_lock(&dmac->chan.vchan.lock);
/* One or more transfers have finished */
if (pending & AXI_DMAC_IRQ_EOT) {
unsigned int completed;
completed = axi_dmac_read(dmac, AXI_DMAC_REG_TRANSFER_DONE);
start_next = axi_dmac_transfer_done(&dmac->chan, completed);
}
/* Space has become available in the descriptor queue */
if ((pending & AXI_DMAC_IRQ_SOT) || start_next)
axi_dmac_start_transfer(&dmac->chan);
spin_unlock(&dmac->chan.vchan.lock);
return IRQ_HANDLED;
}
static int axi_dmac_terminate_all(struct dma_chan *c)
{
struct axi_dmac_chan *chan = to_axi_dmac_chan(c);
struct axi_dmac *dmac = chan_to_axi_dmac(chan);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&chan->vchan.lock, flags);
axi_dmac_write(dmac, AXI_DMAC_REG_CTRL, 0);
chan->next_desc = NULL;
vchan_get_all_descriptors(&chan->vchan, &head);
list_splice_tail_init(&chan->active_descs, &head);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
vchan_dma_desc_free_list(&chan->vchan, &head);
return 0;
}
static void axi_dmac_synchronize(struct dma_chan *c)
{
struct axi_dmac_chan *chan = to_axi_dmac_chan(c);
vchan_synchronize(&chan->vchan);
}
static void axi_dmac_issue_pending(struct dma_chan *c)
{
struct axi_dmac_chan *chan = to_axi_dmac_chan(c);
struct axi_dmac *dmac = chan_to_axi_dmac(chan);
unsigned long flags;
axi_dmac_write(dmac, AXI_DMAC_REG_CTRL, AXI_DMAC_CTRL_ENABLE);
spin_lock_irqsave(&chan->vchan.lock, flags);
if (vchan_issue_pending(&chan->vchan))
axi_dmac_start_transfer(chan);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
}
static struct axi_dmac_desc *axi_dmac_alloc_desc(unsigned int num_sgs)
{
struct axi_dmac_desc *desc;
unsigned int i;
desc = kzalloc(struct_size(desc, sg, num_sgs), GFP_NOWAIT);
if (!desc)
return NULL;
for (i = 0; i < num_sgs; i++)
desc->sg[i].id = AXI_DMAC_SG_UNUSED;
desc->num_sgs = num_sgs;
return desc;
}
static struct axi_dmac_sg *axi_dmac_fill_linear_sg(struct axi_dmac_chan *chan,
enum dma_transfer_direction direction, dma_addr_t addr,
unsigned int num_periods, unsigned int period_len,
struct axi_dmac_sg *sg)
{
unsigned int num_segments, i;
unsigned int segment_size;
unsigned int len;
/* Split into multiple equally sized segments if necessary */
num_segments = DIV_ROUND_UP(period_len, chan->max_length);
segment_size = DIV_ROUND_UP(period_len, num_segments);
/* Take care of alignment */
segment_size = ((segment_size - 1) | chan->length_align_mask) + 1;
for (i = 0; i < num_periods; i++) {
len = period_len;
while (len > segment_size) {
if (direction == DMA_DEV_TO_MEM)
sg->dest_addr = addr;
else
sg->src_addr = addr;
sg->x_len = segment_size;
sg->y_len = 1;
sg++;
addr += segment_size;
len -= segment_size;
}
if (direction == DMA_DEV_TO_MEM)
sg->dest_addr = addr;
else
sg->src_addr = addr;
sg->x_len = len;
sg->y_len = 1;
sg++;
addr += len;
}
return sg;
}
static struct dma_async_tx_descriptor *axi_dmac_prep_slave_sg(
struct dma_chan *c, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct axi_dmac_chan *chan = to_axi_dmac_chan(c);
struct axi_dmac_desc *desc;
struct axi_dmac_sg *dsg;
struct scatterlist *sg;
unsigned int num_sgs;
unsigned int i;
if (direction != chan->direction)
return NULL;
num_sgs = 0;
for_each_sg(sgl, sg, sg_len, i)
num_sgs += DIV_ROUND_UP(sg_dma_len(sg), chan->max_length);
desc = axi_dmac_alloc_desc(num_sgs);
if (!desc)
return NULL;
dsg = desc->sg;
for_each_sg(sgl, sg, sg_len, i) {
if (!axi_dmac_check_addr(chan, sg_dma_address(sg)) ||
!axi_dmac_check_len(chan, sg_dma_len(sg))) {
kfree(desc);
return NULL;
}
dsg = axi_dmac_fill_linear_sg(chan, direction, sg_dma_address(sg), 1,
sg_dma_len(sg), dsg);
}
desc->cyclic = false;
return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
}
static struct dma_async_tx_descriptor *axi_dmac_prep_dma_cyclic(
struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct axi_dmac_chan *chan = to_axi_dmac_chan(c);
struct axi_dmac_desc *desc;
unsigned int num_periods, num_segments;
if (direction != chan->direction)
return NULL;
if (!axi_dmac_check_len(chan, buf_len) ||
!axi_dmac_check_addr(chan, buf_addr))
return NULL;
if (period_len == 0 || buf_len % period_len)
return NULL;
num_periods = buf_len / period_len;
num_segments = DIV_ROUND_UP(period_len, chan->max_length);
desc = axi_dmac_alloc_desc(num_periods * num_segments);
if (!desc)
return NULL;
axi_dmac_fill_linear_sg(chan, direction, buf_addr, num_periods,
period_len, desc->sg);
desc->cyclic = true;
return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
}
static struct dma_async_tx_descriptor *axi_dmac_prep_interleaved(
struct dma_chan *c, struct dma_interleaved_template *xt,
unsigned long flags)
{
struct axi_dmac_chan *chan = to_axi_dmac_chan(c);
struct axi_dmac_desc *desc;
size_t dst_icg, src_icg;
if (xt->frame_size != 1)
return NULL;
if (xt->dir != chan->direction)
return NULL;
if (axi_dmac_src_is_mem(chan)) {
if (!xt->src_inc || !axi_dmac_check_addr(chan, xt->src_start))
return NULL;
}
if (axi_dmac_dest_is_mem(chan)) {
if (!xt->dst_inc || !axi_dmac_check_addr(chan, xt->dst_start))
return NULL;
}
dst_icg = dmaengine_get_dst_icg(xt, &xt->sgl[0]);
src_icg = dmaengine_get_src_icg(xt, &xt->sgl[0]);
if (chan->hw_2d) {
if (!axi_dmac_check_len(chan, xt->sgl[0].size) ||
xt->numf == 0)
return NULL;
if (xt->sgl[0].size + dst_icg > chan->max_length ||
xt->sgl[0].size + src_icg > chan->max_length)
return NULL;
} else {
if (dst_icg != 0 || src_icg != 0)
return NULL;
if (chan->max_length / xt->sgl[0].size < xt->numf)
return NULL;
if (!axi_dmac_check_len(chan, xt->sgl[0].size * xt->numf))
return NULL;
}
desc = axi_dmac_alloc_desc(1);
if (!desc)
return NULL;
if (axi_dmac_src_is_mem(chan)) {
desc->sg[0].src_addr = xt->src_start;
desc->sg[0].src_stride = xt->sgl[0].size + src_icg;
}
if (axi_dmac_dest_is_mem(chan)) {
desc->sg[0].dest_addr = xt->dst_start;
desc->sg[0].dest_stride = xt->sgl[0].size + dst_icg;
}
if (chan->hw_2d) {
desc->sg[0].x_len = xt->sgl[0].size;
desc->sg[0].y_len = xt->numf;
} else {
desc->sg[0].x_len = xt->sgl[0].size * xt->numf;
desc->sg[0].y_len = 1;
}
if (flags & DMA_CYCLIC)
desc->cyclic = true;
return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
}
static void axi_dmac_free_chan_resources(struct dma_chan *c)
{
vchan_free_chan_resources(to_virt_chan(c));
}
static void axi_dmac_desc_free(struct virt_dma_desc *vdesc)
{
kfree(container_of(vdesc, struct axi_dmac_desc, vdesc));
}
static bool axi_dmac_regmap_rdwr(struct device *dev, unsigned int reg)
{
switch (reg) {
case AXI_DMAC_REG_IRQ_MASK:
case AXI_DMAC_REG_IRQ_SOURCE:
case AXI_DMAC_REG_IRQ_PENDING:
case AXI_DMAC_REG_CTRL:
case AXI_DMAC_REG_TRANSFER_ID:
case AXI_DMAC_REG_START_TRANSFER:
case AXI_DMAC_REG_FLAGS:
case AXI_DMAC_REG_DEST_ADDRESS:
case AXI_DMAC_REG_SRC_ADDRESS:
case AXI_DMAC_REG_X_LENGTH:
case AXI_DMAC_REG_Y_LENGTH:
case AXI_DMAC_REG_DEST_STRIDE:
case AXI_DMAC_REG_SRC_STRIDE:
case AXI_DMAC_REG_TRANSFER_DONE:
case AXI_DMAC_REG_ACTIVE_TRANSFER_ID:
case AXI_DMAC_REG_STATUS:
case AXI_DMAC_REG_CURRENT_SRC_ADDR:
case AXI_DMAC_REG_CURRENT_DEST_ADDR:
case AXI_DMAC_REG_PARTIAL_XFER_LEN:
case AXI_DMAC_REG_PARTIAL_XFER_ID:
return true;
default:
return false;
}
}
static const struct regmap_config axi_dmac_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = AXI_DMAC_REG_PARTIAL_XFER_ID,
.readable_reg = axi_dmac_regmap_rdwr,
.writeable_reg = axi_dmac_regmap_rdwr,
};
static void axi_dmac_adjust_chan_params(struct axi_dmac_chan *chan)
{
chan->address_align_mask = max(chan->dest_width, chan->src_width) - 1;
if (axi_dmac_dest_is_mem(chan) && axi_dmac_src_is_mem(chan))
chan->direction = DMA_MEM_TO_MEM;
else if (!axi_dmac_dest_is_mem(chan) && axi_dmac_src_is_mem(chan))
chan->direction = DMA_MEM_TO_DEV;
else if (axi_dmac_dest_is_mem(chan) && !axi_dmac_src_is_mem(chan))
chan->direction = DMA_DEV_TO_MEM;
else
chan->direction = DMA_DEV_TO_DEV;
}
/*
* The configuration stored in the devicetree matches the configuration
* parameters of the peripheral instance and allows the driver to know which
* features are implemented and how it should behave.
*/
static int axi_dmac_parse_chan_dt(struct device_node *of_chan,
struct axi_dmac_chan *chan)
{
u32 val;
int ret;
ret = of_property_read_u32(of_chan, "reg", &val);
if (ret)
return ret;
/* We only support 1 channel for now */
if (val != 0)
return -EINVAL;
ret = of_property_read_u32(of_chan, "adi,source-bus-type", &val);
if (ret)
return ret;
if (val > AXI_DMAC_BUS_TYPE_FIFO)
return -EINVAL;
chan->src_type = val;
ret = of_property_read_u32(of_chan, "adi,destination-bus-type", &val);
if (ret)
return ret;
if (val > AXI_DMAC_BUS_TYPE_FIFO)
return -EINVAL;
chan->dest_type = val;
ret = of_property_read_u32(of_chan, "adi,source-bus-width", &val);
if (ret)
return ret;
chan->src_width = val / 8;
ret = of_property_read_u32(of_chan, "adi,destination-bus-width", &val);
if (ret)
return ret;
chan->dest_width = val / 8;
axi_dmac_adjust_chan_params(chan);
return 0;
}
static int axi_dmac_parse_dt(struct device *dev, struct axi_dmac *dmac)
{
struct device_node *of_channels, *of_chan;
int ret;
of_channels = of_get_child_by_name(dev->of_node, "adi,channels");
if (of_channels == NULL)
return -ENODEV;
for_each_child_of_node(of_channels, of_chan) {
ret = axi_dmac_parse_chan_dt(of_chan, &dmac->chan);
if (ret) {
of_node_put(of_chan);
of_node_put(of_channels);
return -EINVAL;
}
}
of_node_put(of_channels);
return 0;
}
static int axi_dmac_read_chan_config(struct device *dev, struct axi_dmac *dmac)
{
struct axi_dmac_chan *chan = &dmac->chan;
unsigned int val, desc;
desc = axi_dmac_read(dmac, AXI_DMAC_REG_INTERFACE_DESC);
if (desc == 0) {
dev_err(dev, "DMA interface register reads zero\n");
return -EFAULT;
}
val = AXI_DMAC_DMA_SRC_TYPE_GET(desc);
if (val > AXI_DMAC_BUS_TYPE_FIFO) {
dev_err(dev, "Invalid source bus type read: %d\n", val);
return -EINVAL;
}
chan->src_type = val;
val = AXI_DMAC_DMA_DST_TYPE_GET(desc);
if (val > AXI_DMAC_BUS_TYPE_FIFO) {
dev_err(dev, "Invalid destination bus type read: %d\n", val);
return -EINVAL;
}
chan->dest_type = val;
val = AXI_DMAC_DMA_SRC_WIDTH_GET(desc);
if (val == 0) {
dev_err(dev, "Source bus width is zero\n");
return -EINVAL;
}
/* widths are stored in log2 */
chan->src_width = 1 << val;
val = AXI_DMAC_DMA_DST_WIDTH_GET(desc);
if (val == 0) {
dev_err(dev, "Destination bus width is zero\n");
return -EINVAL;
}
chan->dest_width = 1 << val;
axi_dmac_adjust_chan_params(chan);
return 0;
}
static int axi_dmac_detect_caps(struct axi_dmac *dmac, unsigned int version)
{
struct axi_dmac_chan *chan = &dmac->chan;
axi_dmac_write(dmac, AXI_DMAC_REG_FLAGS, AXI_DMAC_FLAG_CYCLIC);
if (axi_dmac_read(dmac, AXI_DMAC_REG_FLAGS) == AXI_DMAC_FLAG_CYCLIC)
chan->hw_cyclic = true;
axi_dmac_write(dmac, AXI_DMAC_REG_Y_LENGTH, 1);
if (axi_dmac_read(dmac, AXI_DMAC_REG_Y_LENGTH) == 1)
chan->hw_2d = true;
axi_dmac_write(dmac, AXI_DMAC_REG_X_LENGTH, 0xffffffff);
chan->max_length = axi_dmac_read(dmac, AXI_DMAC_REG_X_LENGTH);
if (chan->max_length != UINT_MAX)
chan->max_length++;
axi_dmac_write(dmac, AXI_DMAC_REG_DEST_ADDRESS, 0xffffffff);
if (axi_dmac_read(dmac, AXI_DMAC_REG_DEST_ADDRESS) == 0 &&
chan->dest_type == AXI_DMAC_BUS_TYPE_AXI_MM) {
dev_err(dmac->dma_dev.dev,
"Destination memory-mapped interface not supported.");
return -ENODEV;
}
axi_dmac_write(dmac, AXI_DMAC_REG_SRC_ADDRESS, 0xffffffff);
if (axi_dmac_read(dmac, AXI_DMAC_REG_SRC_ADDRESS) == 0 &&
chan->src_type == AXI_DMAC_BUS_TYPE_AXI_MM) {
dev_err(dmac->dma_dev.dev,
"Source memory-mapped interface not supported.");
return -ENODEV;
}
if (version >= ADI_AXI_PCORE_VER(4, 2, 'a'))
chan->hw_partial_xfer = true;
if (version >= ADI_AXI_PCORE_VER(4, 1, 'a')) {
axi_dmac_write(dmac, AXI_DMAC_REG_X_LENGTH, 0x00);
chan->length_align_mask =
axi_dmac_read(dmac, AXI_DMAC_REG_X_LENGTH);
} else {
chan->length_align_mask = chan->address_align_mask;
}
return 0;
}
static int axi_dmac_probe(struct platform_device *pdev)
{
struct dma_device *dma_dev;
struct axi_dmac *dmac;
struct regmap *regmap;
unsigned int version;
int ret;
dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL);
if (!dmac)
return -ENOMEM;
dmac->irq = platform_get_irq(pdev, 0);
if (dmac->irq < 0)
return dmac->irq;
if (dmac->irq == 0)
return -EINVAL;
dmac->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(dmac->base))
return PTR_ERR(dmac->base);
dmac->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(dmac->clk))
return PTR_ERR(dmac->clk);
ret = clk_prepare_enable(dmac->clk);
if (ret < 0)
return ret;
version = axi_dmac_read(dmac, ADI_AXI_REG_VERSION);
if (version >= ADI_AXI_PCORE_VER(4, 3, 'a'))
ret = axi_dmac_read_chan_config(&pdev->dev, dmac);
else
ret = axi_dmac_parse_dt(&pdev->dev, dmac);
if (ret < 0)
goto err_clk_disable;
INIT_LIST_HEAD(&dmac->chan.active_descs);
dma_set_max_seg_size(&pdev->dev, UINT_MAX);
dma_dev = &dmac->dma_dev;
dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
dma_cap_set(DMA_CYCLIC, dma_dev->cap_mask);
dma_cap_set(DMA_INTERLEAVE, dma_dev->cap_mask);
dma_dev->device_free_chan_resources = axi_dmac_free_chan_resources;
dma_dev->device_tx_status = dma_cookie_status;
dma_dev->device_issue_pending = axi_dmac_issue_pending;
dma_dev->device_prep_slave_sg = axi_dmac_prep_slave_sg;
dma_dev->device_prep_dma_cyclic = axi_dmac_prep_dma_cyclic;
dma_dev->device_prep_interleaved_dma = axi_dmac_prep_interleaved;
dma_dev->device_terminate_all = axi_dmac_terminate_all;
dma_dev->device_synchronize = axi_dmac_synchronize;
dma_dev->dev = &pdev->dev;
dma_dev->src_addr_widths = BIT(dmac->chan.src_width);
dma_dev->dst_addr_widths = BIT(dmac->chan.dest_width);
dma_dev->directions = BIT(dmac->chan.direction);
dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
INIT_LIST_HEAD(&dma_dev->channels);
dmac->chan.vchan.desc_free = axi_dmac_desc_free;
vchan_init(&dmac->chan.vchan, dma_dev);
ret = axi_dmac_detect_caps(dmac, version);
if (ret)
goto err_clk_disable;
dma_dev->copy_align = (dmac->chan.address_align_mask + 1);
axi_dmac_write(dmac, AXI_DMAC_REG_IRQ_MASK, 0x00);
if (of_dma_is_coherent(pdev->dev.of_node)) {
ret = axi_dmac_read(dmac, AXI_DMAC_REG_COHERENCY_DESC);
if (version < ADI_AXI_PCORE_VER(4, 4, 'a') ||
!AXI_DMAC_DST_COHERENT_GET(ret)) {
dev_err(dmac->dma_dev.dev,
"Coherent DMA not supported in hardware");
ret = -EINVAL;
goto err_clk_disable;
}
}
ret = dma_async_device_register(dma_dev);
if (ret)
goto err_clk_disable;
ret = of_dma_controller_register(pdev->dev.of_node,
of_dma_xlate_by_chan_id, dma_dev);
if (ret)
goto err_unregister_device;
ret = request_irq(dmac->irq, axi_dmac_interrupt_handler, IRQF_SHARED,
dev_name(&pdev->dev), dmac);
if (ret)
goto err_unregister_of;
platform_set_drvdata(pdev, dmac);
regmap = devm_regmap_init_mmio(&pdev->dev, dmac->base,
&axi_dmac_regmap_config);
if (IS_ERR(regmap)) {
ret = PTR_ERR(regmap);
goto err_free_irq;
}
return 0;
err_free_irq:
free_irq(dmac->irq, dmac);
err_unregister_of:
of_dma_controller_free(pdev->dev.of_node);
err_unregister_device:
dma_async_device_unregister(&dmac->dma_dev);
err_clk_disable:
clk_disable_unprepare(dmac->clk);
return ret;
}
static int axi_dmac_remove(struct platform_device *pdev)
{
struct axi_dmac *dmac = platform_get_drvdata(pdev);
of_dma_controller_free(pdev->dev.of_node);
free_irq(dmac->irq, dmac);
tasklet_kill(&dmac->chan.vchan.task);
dma_async_device_unregister(&dmac->dma_dev);
clk_disable_unprepare(dmac->clk);
return 0;
}
static const struct of_device_id axi_dmac_of_match_table[] = {
{ .compatible = "adi,axi-dmac-1.00.a" },
{ },
};
MODULE_DEVICE_TABLE(of, axi_dmac_of_match_table);
static struct platform_driver axi_dmac_driver = {
.driver = {
.name = "dma-axi-dmac",
.of_match_table = axi_dmac_of_match_table,
},
.probe = axi_dmac_probe,
.remove = axi_dmac_remove,
};
module_platform_driver(axi_dmac_driver);
MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");
MODULE_DESCRIPTION("DMA controller driver for the AXI-DMAC controller");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/dma-axi-dmac.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Core driver for the Intel integrated DMA 64-bit
*
* Copyright (C) 2015 Intel Corporation
* Author: Andy Shevchenko <[email protected]>
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma/idma64.h>
#include "idma64.h"
/* For now we support only two channels */
#define IDMA64_NR_CHAN 2
/* ---------------------------------------------------------------------- */
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
/* ---------------------------------------------------------------------- */
static void idma64_off(struct idma64 *idma64)
{
unsigned short count = 100;
dma_writel(idma64, CFG, 0);
channel_clear_bit(idma64, MASK(XFER), idma64->all_chan_mask);
channel_clear_bit(idma64, MASK(BLOCK), idma64->all_chan_mask);
channel_clear_bit(idma64, MASK(SRC_TRAN), idma64->all_chan_mask);
channel_clear_bit(idma64, MASK(DST_TRAN), idma64->all_chan_mask);
channel_clear_bit(idma64, MASK(ERROR), idma64->all_chan_mask);
do {
cpu_relax();
} while (dma_readl(idma64, CFG) & IDMA64_CFG_DMA_EN && --count);
}
static void idma64_on(struct idma64 *idma64)
{
dma_writel(idma64, CFG, IDMA64_CFG_DMA_EN);
}
/* ---------------------------------------------------------------------- */
static void idma64_chan_init(struct idma64 *idma64, struct idma64_chan *idma64c)
{
u32 cfghi = IDMA64C_CFGH_SRC_PER(1) | IDMA64C_CFGH_DST_PER(0);
u32 cfglo = 0;
/* Set default burst alignment */
cfglo |= IDMA64C_CFGL_DST_BURST_ALIGN | IDMA64C_CFGL_SRC_BURST_ALIGN;
channel_writel(idma64c, CFG_LO, cfglo);
channel_writel(idma64c, CFG_HI, cfghi);
/* Enable interrupts */
channel_set_bit(idma64, MASK(XFER), idma64c->mask);
channel_set_bit(idma64, MASK(ERROR), idma64c->mask);
/*
* Enforce the controller to be turned on.
*
* The iDMA is turned off in ->probe() and looses context during system
* suspend / resume cycle. That's why we have to enable it each time we
* use it.
*/
idma64_on(idma64);
}
static void idma64_chan_stop(struct idma64 *idma64, struct idma64_chan *idma64c)
{
channel_clear_bit(idma64, CH_EN, idma64c->mask);
}
static void idma64_chan_start(struct idma64 *idma64, struct idma64_chan *idma64c)
{
struct idma64_desc *desc = idma64c->desc;
struct idma64_hw_desc *hw = &desc->hw[0];
channel_writeq(idma64c, SAR, 0);
channel_writeq(idma64c, DAR, 0);
channel_writel(idma64c, CTL_HI, IDMA64C_CTLH_BLOCK_TS(~0UL));
channel_writel(idma64c, CTL_LO, IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN);
channel_writeq(idma64c, LLP, hw->llp);
channel_set_bit(idma64, CH_EN, idma64c->mask);
}
static void idma64_stop_transfer(struct idma64_chan *idma64c)
{
struct idma64 *idma64 = to_idma64(idma64c->vchan.chan.device);
idma64_chan_stop(idma64, idma64c);
}
static void idma64_start_transfer(struct idma64_chan *idma64c)
{
struct idma64 *idma64 = to_idma64(idma64c->vchan.chan.device);
struct virt_dma_desc *vdesc;
/* Get the next descriptor */
vdesc = vchan_next_desc(&idma64c->vchan);
if (!vdesc) {
idma64c->desc = NULL;
return;
}
list_del(&vdesc->node);
idma64c->desc = to_idma64_desc(vdesc);
/* Configure the channel */
idma64_chan_init(idma64, idma64c);
/* Start the channel with a new descriptor */
idma64_chan_start(idma64, idma64c);
}
/* ---------------------------------------------------------------------- */
static void idma64_chan_irq(struct idma64 *idma64, unsigned short c,
u32 status_err, u32 status_xfer)
{
struct idma64_chan *idma64c = &idma64->chan[c];
struct dma_chan_percpu *stat;
struct idma64_desc *desc;
stat = this_cpu_ptr(idma64c->vchan.chan.local);
spin_lock(&idma64c->vchan.lock);
desc = idma64c->desc;
if (desc) {
if (status_err & (1 << c)) {
dma_writel(idma64, CLEAR(ERROR), idma64c->mask);
desc->status = DMA_ERROR;
} else if (status_xfer & (1 << c)) {
dma_writel(idma64, CLEAR(XFER), idma64c->mask);
desc->status = DMA_COMPLETE;
vchan_cookie_complete(&desc->vdesc);
stat->bytes_transferred += desc->length;
idma64_start_transfer(idma64c);
}
/* idma64_start_transfer() updates idma64c->desc */
if (idma64c->desc == NULL || desc->status == DMA_ERROR)
idma64_stop_transfer(idma64c);
}
spin_unlock(&idma64c->vchan.lock);
}
static irqreturn_t idma64_irq(int irq, void *dev)
{
struct idma64 *idma64 = dev;
u32 status = dma_readl(idma64, STATUS_INT);
u32 status_xfer;
u32 status_err;
unsigned short i;
dev_vdbg(idma64->dma.dev, "%s: status=%#x\n", __func__, status);
/* Check if we have any interrupt from the DMA controller */
if (!status)
return IRQ_NONE;
status_xfer = dma_readl(idma64, RAW(XFER));
status_err = dma_readl(idma64, RAW(ERROR));
for (i = 0; i < idma64->dma.chancnt; i++)
idma64_chan_irq(idma64, i, status_err, status_xfer);
return IRQ_HANDLED;
}
/* ---------------------------------------------------------------------- */
static struct idma64_desc *idma64_alloc_desc(unsigned int ndesc)
{
struct idma64_desc *desc;
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
desc->hw = kcalloc(ndesc, sizeof(*desc->hw), GFP_NOWAIT);
if (!desc->hw) {
kfree(desc);
return NULL;
}
return desc;
}
static void idma64_desc_free(struct idma64_chan *idma64c,
struct idma64_desc *desc)
{
struct idma64_hw_desc *hw;
if (desc->ndesc) {
unsigned int i = desc->ndesc;
do {
hw = &desc->hw[--i];
dma_pool_free(idma64c->pool, hw->lli, hw->llp);
} while (i);
}
kfree(desc->hw);
kfree(desc);
}
static void idma64_vdesc_free(struct virt_dma_desc *vdesc)
{
struct idma64_chan *idma64c = to_idma64_chan(vdesc->tx.chan);
idma64_desc_free(idma64c, to_idma64_desc(vdesc));
}
static void idma64_hw_desc_fill(struct idma64_hw_desc *hw,
struct dma_slave_config *config,
enum dma_transfer_direction direction, u64 llp)
{
struct idma64_lli *lli = hw->lli;
u64 sar, dar;
u32 ctlhi = IDMA64C_CTLH_BLOCK_TS(hw->len);
u32 ctllo = IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN;
u32 src_width, dst_width;
if (direction == DMA_MEM_TO_DEV) {
sar = hw->phys;
dar = config->dst_addr;
ctllo |= IDMA64C_CTLL_DST_FIX | IDMA64C_CTLL_SRC_INC |
IDMA64C_CTLL_FC_M2P;
src_width = __ffs(sar | hw->len | 4);
dst_width = __ffs(config->dst_addr_width);
} else { /* DMA_DEV_TO_MEM */
sar = config->src_addr;
dar = hw->phys;
ctllo |= IDMA64C_CTLL_DST_INC | IDMA64C_CTLL_SRC_FIX |
IDMA64C_CTLL_FC_P2M;
src_width = __ffs(config->src_addr_width);
dst_width = __ffs(dar | hw->len | 4);
}
lli->sar = sar;
lli->dar = dar;
lli->ctlhi = ctlhi;
lli->ctllo = ctllo |
IDMA64C_CTLL_SRC_MSIZE(config->src_maxburst) |
IDMA64C_CTLL_DST_MSIZE(config->dst_maxburst) |
IDMA64C_CTLL_DST_WIDTH(dst_width) |
IDMA64C_CTLL_SRC_WIDTH(src_width);
lli->llp = llp;
}
static void idma64_desc_fill(struct idma64_chan *idma64c,
struct idma64_desc *desc)
{
struct dma_slave_config *config = &idma64c->config;
unsigned int i = desc->ndesc;
struct idma64_hw_desc *hw = &desc->hw[i - 1];
struct idma64_lli *lli = hw->lli;
u64 llp = 0;
/* Fill the hardware descriptors and link them to a list */
do {
hw = &desc->hw[--i];
idma64_hw_desc_fill(hw, config, desc->direction, llp);
llp = hw->llp;
desc->length += hw->len;
} while (i);
/* Trigger an interrupt after the last block is transfered */
lli->ctllo |= IDMA64C_CTLL_INT_EN;
/* Disable LLP transfer in the last block */
lli->ctllo &= ~(IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN);
}
static struct dma_async_tx_descriptor *idma64_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
struct idma64_desc *desc;
struct scatterlist *sg;
unsigned int i;
desc = idma64_alloc_desc(sg_len);
if (!desc)
return NULL;
for_each_sg(sgl, sg, sg_len, i) {
struct idma64_hw_desc *hw = &desc->hw[i];
/* Allocate DMA capable memory for hardware descriptor */
hw->lli = dma_pool_alloc(idma64c->pool, GFP_NOWAIT, &hw->llp);
if (!hw->lli) {
desc->ndesc = i;
idma64_desc_free(idma64c, desc);
return NULL;
}
hw->phys = sg_dma_address(sg);
hw->len = sg_dma_len(sg);
}
desc->ndesc = sg_len;
desc->direction = direction;
desc->status = DMA_IN_PROGRESS;
idma64_desc_fill(idma64c, desc);
return vchan_tx_prep(&idma64c->vchan, &desc->vdesc, flags);
}
static void idma64_issue_pending(struct dma_chan *chan)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
unsigned long flags;
spin_lock_irqsave(&idma64c->vchan.lock, flags);
if (vchan_issue_pending(&idma64c->vchan) && !idma64c->desc)
idma64_start_transfer(idma64c);
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
}
static size_t idma64_active_desc_size(struct idma64_chan *idma64c)
{
struct idma64_desc *desc = idma64c->desc;
struct idma64_hw_desc *hw;
size_t bytes = desc->length;
u64 llp = channel_readq(idma64c, LLP);
u32 ctlhi = channel_readl(idma64c, CTL_HI);
unsigned int i = 0;
do {
hw = &desc->hw[i];
if (hw->llp == llp)
break;
bytes -= hw->len;
} while (++i < desc->ndesc);
if (!i)
return bytes;
/* The current chunk is not fully transfered yet */
bytes += desc->hw[--i].len;
return bytes - IDMA64C_CTLH_BLOCK_TS(ctlhi);
}
static enum dma_status idma64_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *state)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
struct virt_dma_desc *vdesc;
enum dma_status status;
size_t bytes;
unsigned long flags;
status = dma_cookie_status(chan, cookie, state);
if (status == DMA_COMPLETE)
return status;
spin_lock_irqsave(&idma64c->vchan.lock, flags);
vdesc = vchan_find_desc(&idma64c->vchan, cookie);
if (idma64c->desc && cookie == idma64c->desc->vdesc.tx.cookie) {
bytes = idma64_active_desc_size(idma64c);
dma_set_residue(state, bytes);
status = idma64c->desc->status;
} else if (vdesc) {
bytes = to_idma64_desc(vdesc)->length;
dma_set_residue(state, bytes);
}
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
return status;
}
static void convert_burst(u32 *maxburst)
{
if (*maxburst)
*maxburst = __fls(*maxburst);
else
*maxburst = 0;
}
static int idma64_slave_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
memcpy(&idma64c->config, config, sizeof(idma64c->config));
convert_burst(&idma64c->config.src_maxburst);
convert_burst(&idma64c->config.dst_maxburst);
return 0;
}
static void idma64_chan_deactivate(struct idma64_chan *idma64c, bool drain)
{
unsigned short count = 100;
u32 cfglo;
cfglo = channel_readl(idma64c, CFG_LO);
if (drain)
cfglo |= IDMA64C_CFGL_CH_DRAIN;
else
cfglo &= ~IDMA64C_CFGL_CH_DRAIN;
channel_writel(idma64c, CFG_LO, cfglo | IDMA64C_CFGL_CH_SUSP);
do {
udelay(1);
cfglo = channel_readl(idma64c, CFG_LO);
} while (!(cfglo & IDMA64C_CFGL_FIFO_EMPTY) && --count);
}
static void idma64_chan_activate(struct idma64_chan *idma64c)
{
u32 cfglo;
cfglo = channel_readl(idma64c, CFG_LO);
channel_writel(idma64c, CFG_LO, cfglo & ~IDMA64C_CFGL_CH_SUSP);
}
static int idma64_pause(struct dma_chan *chan)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
unsigned long flags;
spin_lock_irqsave(&idma64c->vchan.lock, flags);
if (idma64c->desc && idma64c->desc->status == DMA_IN_PROGRESS) {
idma64_chan_deactivate(idma64c, false);
idma64c->desc->status = DMA_PAUSED;
}
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
return 0;
}
static int idma64_resume(struct dma_chan *chan)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
unsigned long flags;
spin_lock_irqsave(&idma64c->vchan.lock, flags);
if (idma64c->desc && idma64c->desc->status == DMA_PAUSED) {
idma64c->desc->status = DMA_IN_PROGRESS;
idma64_chan_activate(idma64c);
}
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
return 0;
}
static int idma64_terminate_all(struct dma_chan *chan)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&idma64c->vchan.lock, flags);
idma64_chan_deactivate(idma64c, true);
idma64_stop_transfer(idma64c);
if (idma64c->desc) {
idma64_vdesc_free(&idma64c->desc->vdesc);
idma64c->desc = NULL;
}
vchan_get_all_descriptors(&idma64c->vchan, &head);
spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
vchan_dma_desc_free_list(&idma64c->vchan, &head);
return 0;
}
static void idma64_synchronize(struct dma_chan *chan)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
vchan_synchronize(&idma64c->vchan);
}
static int idma64_alloc_chan_resources(struct dma_chan *chan)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
/* Create a pool of consistent memory blocks for hardware descriptors */
idma64c->pool = dma_pool_create(dev_name(chan2dev(chan)),
chan->device->dev,
sizeof(struct idma64_lli), 8, 0);
if (!idma64c->pool) {
dev_err(chan2dev(chan), "No memory for descriptors\n");
return -ENOMEM;
}
return 0;
}
static void idma64_free_chan_resources(struct dma_chan *chan)
{
struct idma64_chan *idma64c = to_idma64_chan(chan);
vchan_free_chan_resources(to_virt_chan(chan));
dma_pool_destroy(idma64c->pool);
idma64c->pool = NULL;
}
/* ---------------------------------------------------------------------- */
#define IDMA64_BUSWIDTHS \
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)
static int idma64_probe(struct idma64_chip *chip)
{
struct idma64 *idma64;
unsigned short nr_chan = IDMA64_NR_CHAN;
unsigned short i;
int ret;
idma64 = devm_kzalloc(chip->dev, sizeof(*idma64), GFP_KERNEL);
if (!idma64)
return -ENOMEM;
idma64->regs = chip->regs;
chip->idma64 = idma64;
idma64->chan = devm_kcalloc(chip->dev, nr_chan, sizeof(*idma64->chan),
GFP_KERNEL);
if (!idma64->chan)
return -ENOMEM;
idma64->all_chan_mask = (1 << nr_chan) - 1;
/* Turn off iDMA controller */
idma64_off(idma64);
ret = devm_request_irq(chip->dev, chip->irq, idma64_irq, IRQF_SHARED,
dev_name(chip->dev), idma64);
if (ret)
return ret;
INIT_LIST_HEAD(&idma64->dma.channels);
for (i = 0; i < nr_chan; i++) {
struct idma64_chan *idma64c = &idma64->chan[i];
idma64c->vchan.desc_free = idma64_vdesc_free;
vchan_init(&idma64c->vchan, &idma64->dma);
idma64c->regs = idma64->regs + i * IDMA64_CH_LENGTH;
idma64c->mask = BIT(i);
}
dma_cap_set(DMA_SLAVE, idma64->dma.cap_mask);
dma_cap_set(DMA_PRIVATE, idma64->dma.cap_mask);
idma64->dma.device_alloc_chan_resources = idma64_alloc_chan_resources;
idma64->dma.device_free_chan_resources = idma64_free_chan_resources;
idma64->dma.device_prep_slave_sg = idma64_prep_slave_sg;
idma64->dma.device_issue_pending = idma64_issue_pending;
idma64->dma.device_tx_status = idma64_tx_status;
idma64->dma.device_config = idma64_slave_config;
idma64->dma.device_pause = idma64_pause;
idma64->dma.device_resume = idma64_resume;
idma64->dma.device_terminate_all = idma64_terminate_all;
idma64->dma.device_synchronize = idma64_synchronize;
idma64->dma.src_addr_widths = IDMA64_BUSWIDTHS;
idma64->dma.dst_addr_widths = IDMA64_BUSWIDTHS;
idma64->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
idma64->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
idma64->dma.dev = chip->sysdev;
dma_set_max_seg_size(idma64->dma.dev, IDMA64C_CTLH_BLOCK_TS_MASK);
ret = dma_async_device_register(&idma64->dma);
if (ret)
return ret;
dev_info(chip->dev, "Found Intel integrated DMA 64-bit\n");
return 0;
}
static void idma64_remove(struct idma64_chip *chip)
{
struct idma64 *idma64 = chip->idma64;
unsigned short i;
dma_async_device_unregister(&idma64->dma);
/*
* Explicitly call devm_request_irq() to avoid the side effects with
* the scheduled tasklets.
*/
devm_free_irq(chip->dev, chip->irq, idma64);
for (i = 0; i < idma64->dma.chancnt; i++) {
struct idma64_chan *idma64c = &idma64->chan[i];
tasklet_kill(&idma64c->vchan.task);
}
}
/* ---------------------------------------------------------------------- */
static int idma64_platform_probe(struct platform_device *pdev)
{
struct idma64_chip *chip;
struct device *dev = &pdev->dev;
struct device *sysdev = dev->parent;
int ret;
chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->irq = platform_get_irq(pdev, 0);
if (chip->irq < 0)
return chip->irq;
chip->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(chip->regs))
return PTR_ERR(chip->regs);
ret = dma_coerce_mask_and_coherent(sysdev, DMA_BIT_MASK(64));
if (ret)
return ret;
chip->dev = dev;
chip->sysdev = sysdev;
ret = idma64_probe(chip);
if (ret)
return ret;
platform_set_drvdata(pdev, chip);
return 0;
}
static int idma64_platform_remove(struct platform_device *pdev)
{
struct idma64_chip *chip = platform_get_drvdata(pdev);
idma64_remove(chip);
return 0;
}
static int __maybe_unused idma64_pm_suspend(struct device *dev)
{
struct idma64_chip *chip = dev_get_drvdata(dev);
idma64_off(chip->idma64);
return 0;
}
static int __maybe_unused idma64_pm_resume(struct device *dev)
{
struct idma64_chip *chip = dev_get_drvdata(dev);
idma64_on(chip->idma64);
return 0;
}
static const struct dev_pm_ops idma64_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(idma64_pm_suspend, idma64_pm_resume)
};
static struct platform_driver idma64_platform_driver = {
.probe = idma64_platform_probe,
.remove = idma64_platform_remove,
.driver = {
.name = LPSS_IDMA64_DRIVER_NAME,
.pm = &idma64_dev_pm_ops,
},
};
module_platform_driver(idma64_platform_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("iDMA64 core driver");
MODULE_AUTHOR("Andy Shevchenko <[email protected]>");
MODULE_ALIAS("platform:" LPSS_IDMA64_DRIVER_NAME);
| linux-master | drivers/dma/idma64.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DMA driver for Altera mSGDMA IP core
*
* Copyright (C) 2017 Stefan Roese <[email protected]>
*
* Based on drivers/dma/xilinx/zynqmp_dma.c, which is:
* Copyright (C) 2016 Xilinx, Inc. All rights reserved.
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of_dma.h>
#include "dmaengine.h"
#define MSGDMA_MAX_TRANS_LEN U32_MAX
#define MSGDMA_DESC_NUM 1024
/**
* struct msgdma_extended_desc - implements an extended descriptor
* @read_addr_lo: data buffer source address low bits
* @write_addr_lo: data buffer destination address low bits
* @len: the number of bytes to transfer per descriptor
* @burst_seq_num: bit 31:24 write burst
* bit 23:16 read burst
* bit 15:00 sequence number
* @stride: bit 31:16 write stride
* bit 15:00 read stride
* @read_addr_hi: data buffer source address high bits
* @write_addr_hi: data buffer destination address high bits
* @control: characteristics of the transfer
*/
struct msgdma_extended_desc {
u32 read_addr_lo;
u32 write_addr_lo;
u32 len;
u32 burst_seq_num;
u32 stride;
u32 read_addr_hi;
u32 write_addr_hi;
u32 control;
};
/* mSGDMA descriptor control field bit definitions */
#define MSGDMA_DESC_CTL_SET_CH(x) ((x) & 0xff)
#define MSGDMA_DESC_CTL_GEN_SOP BIT(8)
#define MSGDMA_DESC_CTL_GEN_EOP BIT(9)
#define MSGDMA_DESC_CTL_PARK_READS BIT(10)
#define MSGDMA_DESC_CTL_PARK_WRITES BIT(11)
#define MSGDMA_DESC_CTL_END_ON_EOP BIT(12)
#define MSGDMA_DESC_CTL_END_ON_LEN BIT(13)
#define MSGDMA_DESC_CTL_TR_COMP_IRQ BIT(14)
#define MSGDMA_DESC_CTL_EARLY_IRQ BIT(15)
#define MSGDMA_DESC_CTL_TR_ERR_IRQ GENMASK(23, 16)
#define MSGDMA_DESC_CTL_EARLY_DONE BIT(24)
/*
* Writing "1" the "go" bit commits the entire descriptor into the
* descriptor FIFO(s)
*/
#define MSGDMA_DESC_CTL_GO BIT(31)
/* Tx buffer control flags */
#define MSGDMA_DESC_CTL_TX_FIRST (MSGDMA_DESC_CTL_GEN_SOP | \
MSGDMA_DESC_CTL_TR_ERR_IRQ | \
MSGDMA_DESC_CTL_GO)
#define MSGDMA_DESC_CTL_TX_MIDDLE (MSGDMA_DESC_CTL_TR_ERR_IRQ | \
MSGDMA_DESC_CTL_GO)
#define MSGDMA_DESC_CTL_TX_LAST (MSGDMA_DESC_CTL_GEN_EOP | \
MSGDMA_DESC_CTL_TR_COMP_IRQ | \
MSGDMA_DESC_CTL_TR_ERR_IRQ | \
MSGDMA_DESC_CTL_GO)
#define MSGDMA_DESC_CTL_TX_SINGLE (MSGDMA_DESC_CTL_GEN_SOP | \
MSGDMA_DESC_CTL_GEN_EOP | \
MSGDMA_DESC_CTL_TR_COMP_IRQ | \
MSGDMA_DESC_CTL_TR_ERR_IRQ | \
MSGDMA_DESC_CTL_GO)
#define MSGDMA_DESC_CTL_RX_SINGLE (MSGDMA_DESC_CTL_END_ON_EOP | \
MSGDMA_DESC_CTL_END_ON_LEN | \
MSGDMA_DESC_CTL_TR_COMP_IRQ | \
MSGDMA_DESC_CTL_EARLY_IRQ | \
MSGDMA_DESC_CTL_TR_ERR_IRQ | \
MSGDMA_DESC_CTL_GO)
/* mSGDMA extended descriptor stride definitions */
#define MSGDMA_DESC_STRIDE_RD 0x00000001
#define MSGDMA_DESC_STRIDE_WR 0x00010000
#define MSGDMA_DESC_STRIDE_RW 0x00010001
/* mSGDMA dispatcher control and status register map */
#define MSGDMA_CSR_STATUS 0x00 /* Read / Clear */
#define MSGDMA_CSR_CONTROL 0x04 /* Read / Write */
#define MSGDMA_CSR_RW_FILL_LEVEL 0x08 /* 31:16 - write fill level */
/* 15:00 - read fill level */
#define MSGDMA_CSR_RESP_FILL_LEVEL 0x0c /* response FIFO fill level */
#define MSGDMA_CSR_RW_SEQ_NUM 0x10 /* 31:16 - write seq number */
/* 15:00 - read seq number */
/* mSGDMA CSR status register bit definitions */
#define MSGDMA_CSR_STAT_BUSY BIT(0)
#define MSGDMA_CSR_STAT_DESC_BUF_EMPTY BIT(1)
#define MSGDMA_CSR_STAT_DESC_BUF_FULL BIT(2)
#define MSGDMA_CSR_STAT_RESP_BUF_EMPTY BIT(3)
#define MSGDMA_CSR_STAT_RESP_BUF_FULL BIT(4)
#define MSGDMA_CSR_STAT_STOPPED BIT(5)
#define MSGDMA_CSR_STAT_RESETTING BIT(6)
#define MSGDMA_CSR_STAT_STOPPED_ON_ERR BIT(7)
#define MSGDMA_CSR_STAT_STOPPED_ON_EARLY BIT(8)
#define MSGDMA_CSR_STAT_IRQ BIT(9)
#define MSGDMA_CSR_STAT_MASK GENMASK(9, 0)
#define MSGDMA_CSR_STAT_MASK_WITHOUT_IRQ GENMASK(8, 0)
#define DESC_EMPTY (MSGDMA_CSR_STAT_DESC_BUF_EMPTY | \
MSGDMA_CSR_STAT_RESP_BUF_EMPTY)
/* mSGDMA CSR control register bit definitions */
#define MSGDMA_CSR_CTL_STOP BIT(0)
#define MSGDMA_CSR_CTL_RESET BIT(1)
#define MSGDMA_CSR_CTL_STOP_ON_ERR BIT(2)
#define MSGDMA_CSR_CTL_STOP_ON_EARLY BIT(3)
#define MSGDMA_CSR_CTL_GLOBAL_INTR BIT(4)
#define MSGDMA_CSR_CTL_STOP_DESCS BIT(5)
/* mSGDMA CSR fill level bits */
#define MSGDMA_CSR_WR_FILL_LEVEL_GET(v) (((v) & 0xffff0000) >> 16)
#define MSGDMA_CSR_RD_FILL_LEVEL_GET(v) ((v) & 0x0000ffff)
#define MSGDMA_CSR_RESP_FILL_LEVEL_GET(v) ((v) & 0x0000ffff)
#define MSGDMA_CSR_SEQ_NUM_GET(v) (((v) & 0xffff0000) >> 16)
/* mSGDMA response register map */
#define MSGDMA_RESP_BYTES_TRANSFERRED 0x00
#define MSGDMA_RESP_STATUS 0x04
/* mSGDMA response register bit definitions */
#define MSGDMA_RESP_EARLY_TERM BIT(8)
#define MSGDMA_RESP_ERR_MASK 0xff
/**
* struct msgdma_sw_desc - implements a sw descriptor
* @async_tx: support for the async_tx api
* @hw_desc: assosiated HW descriptor
* @node: node to move from the free list to the tx list
* @tx_list: transmit list node
*/
struct msgdma_sw_desc {
struct dma_async_tx_descriptor async_tx;
struct msgdma_extended_desc hw_desc;
struct list_head node;
struct list_head tx_list;
};
/*
* struct msgdma_device - DMA device structure
*/
struct msgdma_device {
spinlock_t lock;
struct device *dev;
struct tasklet_struct irq_tasklet;
struct list_head pending_list;
struct list_head free_list;
struct list_head active_list;
struct list_head done_list;
u32 desc_free_cnt;
bool idle;
struct dma_device dmadev;
struct dma_chan dmachan;
dma_addr_t hw_desq;
struct msgdma_sw_desc *sw_desq;
unsigned int npendings;
struct dma_slave_config slave_cfg;
int irq;
/* mSGDMA controller */
void __iomem *csr;
/* mSGDMA descriptors */
void __iomem *desc;
/* mSGDMA response */
void __iomem *resp;
};
#define to_mdev(chan) container_of(chan, struct msgdma_device, dmachan)
#define tx_to_desc(tx) container_of(tx, struct msgdma_sw_desc, async_tx)
/**
* msgdma_get_descriptor - Get the sw descriptor from the pool
* @mdev: Pointer to the Altera mSGDMA device structure
*
* Return: The sw descriptor
*/
static struct msgdma_sw_desc *msgdma_get_descriptor(struct msgdma_device *mdev)
{
struct msgdma_sw_desc *desc;
unsigned long flags;
spin_lock_irqsave(&mdev->lock, flags);
desc = list_first_entry(&mdev->free_list, struct msgdma_sw_desc, node);
list_del(&desc->node);
spin_unlock_irqrestore(&mdev->lock, flags);
INIT_LIST_HEAD(&desc->tx_list);
return desc;
}
/**
* msgdma_free_descriptor - Issue pending transactions
* @mdev: Pointer to the Altera mSGDMA device structure
* @desc: Transaction descriptor pointer
*/
static void msgdma_free_descriptor(struct msgdma_device *mdev,
struct msgdma_sw_desc *desc)
{
struct msgdma_sw_desc *child, *next;
mdev->desc_free_cnt++;
list_add_tail(&desc->node, &mdev->free_list);
list_for_each_entry_safe(child, next, &desc->tx_list, node) {
mdev->desc_free_cnt++;
list_move_tail(&child->node, &mdev->free_list);
}
}
/**
* msgdma_free_desc_list - Free descriptors list
* @mdev: Pointer to the Altera mSGDMA device structure
* @list: List to parse and delete the descriptor
*/
static void msgdma_free_desc_list(struct msgdma_device *mdev,
struct list_head *list)
{
struct msgdma_sw_desc *desc, *next;
list_for_each_entry_safe(desc, next, list, node)
msgdma_free_descriptor(mdev, desc);
}
/**
* msgdma_desc_config - Configure the descriptor
* @desc: Hw descriptor pointer
* @dst: Destination buffer address
* @src: Source buffer address
* @len: Transfer length
* @stride: Read/write stride value to set
*/
static void msgdma_desc_config(struct msgdma_extended_desc *desc,
dma_addr_t dst, dma_addr_t src, size_t len,
u32 stride)
{
/* Set lower 32bits of src & dst addresses in the descriptor */
desc->read_addr_lo = lower_32_bits(src);
desc->write_addr_lo = lower_32_bits(dst);
/* Set upper 32bits of src & dst addresses in the descriptor */
desc->read_addr_hi = upper_32_bits(src);
desc->write_addr_hi = upper_32_bits(dst);
desc->len = len;
desc->stride = stride;
desc->burst_seq_num = 0; /* 0 will result in max burst length */
/*
* Don't set interrupt on xfer end yet, this will be done later
* for the "last" descriptor
*/
desc->control = MSGDMA_DESC_CTL_TR_ERR_IRQ | MSGDMA_DESC_CTL_GO |
MSGDMA_DESC_CTL_END_ON_LEN;
}
/**
* msgdma_desc_config_eod - Mark the descriptor as end descriptor
* @desc: Hw descriptor pointer
*/
static void msgdma_desc_config_eod(struct msgdma_extended_desc *desc)
{
desc->control |= MSGDMA_DESC_CTL_TR_COMP_IRQ;
}
/**
* msgdma_tx_submit - Submit DMA transaction
* @tx: Async transaction descriptor pointer
*
* Return: cookie value
*/
static dma_cookie_t msgdma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct msgdma_device *mdev = to_mdev(tx->chan);
struct msgdma_sw_desc *new;
dma_cookie_t cookie;
unsigned long flags;
new = tx_to_desc(tx);
spin_lock_irqsave(&mdev->lock, flags);
cookie = dma_cookie_assign(tx);
list_add_tail(&new->node, &mdev->pending_list);
spin_unlock_irqrestore(&mdev->lock, flags);
return cookie;
}
/**
* msgdma_prep_memcpy - prepare descriptors for memcpy transaction
* @dchan: DMA channel
* @dma_dst: Destination buffer address
* @dma_src: Source buffer address
* @len: Transfer length
* @flags: transfer ack flags
*
* Return: Async transaction descriptor on success and NULL on failure
*/
static struct dma_async_tx_descriptor *
msgdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst,
dma_addr_t dma_src, size_t len, ulong flags)
{
struct msgdma_device *mdev = to_mdev(dchan);
struct msgdma_sw_desc *new, *first = NULL;
struct msgdma_extended_desc *desc;
size_t copy;
u32 desc_cnt;
unsigned long irqflags;
desc_cnt = DIV_ROUND_UP(len, MSGDMA_MAX_TRANS_LEN);
spin_lock_irqsave(&mdev->lock, irqflags);
if (desc_cnt > mdev->desc_free_cnt) {
spin_unlock_irqrestore(&mdev->lock, irqflags);
dev_dbg(mdev->dev, "mdev %p descs are not available\n", mdev);
return NULL;
}
mdev->desc_free_cnt -= desc_cnt;
spin_unlock_irqrestore(&mdev->lock, irqflags);
do {
/* Allocate and populate the descriptor */
new = msgdma_get_descriptor(mdev);
copy = min_t(size_t, len, MSGDMA_MAX_TRANS_LEN);
desc = &new->hw_desc;
msgdma_desc_config(desc, dma_dst, dma_src, copy,
MSGDMA_DESC_STRIDE_RW);
len -= copy;
dma_src += copy;
dma_dst += copy;
if (!first)
first = new;
else
list_add_tail(&new->node, &first->tx_list);
} while (len);
msgdma_desc_config_eod(desc);
async_tx_ack(&first->async_tx);
first->async_tx.flags = flags;
return &first->async_tx;
}
/**
* msgdma_prep_slave_sg - prepare descriptors for a slave sg transaction
*
* @dchan: DMA channel
* @sgl: Destination scatter list
* @sg_len: Number of entries in destination scatter list
* @dir: DMA transfer direction
* @flags: transfer ack flags
* @context: transfer context (unused)
*/
static struct dma_async_tx_descriptor *
msgdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct msgdma_device *mdev = to_mdev(dchan);
struct dma_slave_config *cfg = &mdev->slave_cfg;
struct msgdma_sw_desc *new, *first = NULL;
void *desc = NULL;
size_t len, avail;
dma_addr_t dma_dst, dma_src;
u32 desc_cnt = 0, i;
struct scatterlist *sg;
u32 stride;
unsigned long irqflags;
for_each_sg(sgl, sg, sg_len, i)
desc_cnt += DIV_ROUND_UP(sg_dma_len(sg), MSGDMA_MAX_TRANS_LEN);
spin_lock_irqsave(&mdev->lock, irqflags);
if (desc_cnt > mdev->desc_free_cnt) {
spin_unlock_irqrestore(&mdev->lock, irqflags);
dev_dbg(mdev->dev, "mdev %p descs are not available\n", mdev);
return NULL;
}
mdev->desc_free_cnt -= desc_cnt;
spin_unlock_irqrestore(&mdev->lock, irqflags);
avail = sg_dma_len(sgl);
/* Run until we are out of scatterlist entries */
while (true) {
/* Allocate and populate the descriptor */
new = msgdma_get_descriptor(mdev);
desc = &new->hw_desc;
len = min_t(size_t, avail, MSGDMA_MAX_TRANS_LEN);
if (dir == DMA_MEM_TO_DEV) {
dma_src = sg_dma_address(sgl) + sg_dma_len(sgl) - avail;
dma_dst = cfg->dst_addr;
stride = MSGDMA_DESC_STRIDE_RD;
} else {
dma_src = cfg->src_addr;
dma_dst = sg_dma_address(sgl) + sg_dma_len(sgl) - avail;
stride = MSGDMA_DESC_STRIDE_WR;
}
msgdma_desc_config(desc, dma_dst, dma_src, len, stride);
avail -= len;
if (!first)
first = new;
else
list_add_tail(&new->node, &first->tx_list);
/* Fetch the next scatterlist entry */
if (avail == 0) {
if (sg_len == 0)
break;
sgl = sg_next(sgl);
if (sgl == NULL)
break;
sg_len--;
avail = sg_dma_len(sgl);
}
}
msgdma_desc_config_eod(desc);
first->async_tx.flags = flags;
return &first->async_tx;
}
static int msgdma_dma_config(struct dma_chan *dchan,
struct dma_slave_config *config)
{
struct msgdma_device *mdev = to_mdev(dchan);
memcpy(&mdev->slave_cfg, config, sizeof(*config));
return 0;
}
static void msgdma_reset(struct msgdma_device *mdev)
{
u32 val;
int ret;
/* Reset mSGDMA */
iowrite32(MSGDMA_CSR_STAT_MASK, mdev->csr + MSGDMA_CSR_STATUS);
iowrite32(MSGDMA_CSR_CTL_RESET, mdev->csr + MSGDMA_CSR_CONTROL);
ret = readl_poll_timeout(mdev->csr + MSGDMA_CSR_STATUS, val,
(val & MSGDMA_CSR_STAT_RESETTING) == 0,
1, 10000);
if (ret)
dev_err(mdev->dev, "DMA channel did not reset\n");
/* Clear all status bits */
iowrite32(MSGDMA_CSR_STAT_MASK, mdev->csr + MSGDMA_CSR_STATUS);
/* Enable the DMA controller including interrupts */
iowrite32(MSGDMA_CSR_CTL_STOP_ON_ERR | MSGDMA_CSR_CTL_STOP_ON_EARLY |
MSGDMA_CSR_CTL_GLOBAL_INTR, mdev->csr + MSGDMA_CSR_CONTROL);
mdev->idle = true;
};
static void msgdma_copy_one(struct msgdma_device *mdev,
struct msgdma_sw_desc *desc)
{
void __iomem *hw_desc = mdev->desc;
/*
* Check if the DESC FIFO it not full. If its full, we need to wait
* for at least one entry to become free again
*/
while (ioread32(mdev->csr + MSGDMA_CSR_STATUS) &
MSGDMA_CSR_STAT_DESC_BUF_FULL)
mdelay(1);
/*
* The descriptor needs to get copied into the descriptor FIFO
* of the DMA controller. The descriptor will get flushed to the
* FIFO, once the last word (control word) is written. Since we
* are not 100% sure that memcpy() writes all word in the "correct"
* oder (address from low to high) on all architectures, we make
* sure this control word is written last by single coding it and
* adding some write-barriers here.
*/
memcpy((void __force *)hw_desc, &desc->hw_desc,
sizeof(desc->hw_desc) - sizeof(u32));
/* Write control word last to flush this descriptor into the FIFO */
mdev->idle = false;
wmb();
iowrite32(desc->hw_desc.control, hw_desc +
offsetof(struct msgdma_extended_desc, control));
wmb();
}
/**
* msgdma_copy_desc_to_fifo - copy descriptor(s) into controller FIFO
* @mdev: Pointer to the Altera mSGDMA device structure
* @desc: Transaction descriptor pointer
*/
static void msgdma_copy_desc_to_fifo(struct msgdma_device *mdev,
struct msgdma_sw_desc *desc)
{
struct msgdma_sw_desc *sdesc, *next;
msgdma_copy_one(mdev, desc);
list_for_each_entry_safe(sdesc, next, &desc->tx_list, node)
msgdma_copy_one(mdev, sdesc);
}
/**
* msgdma_start_transfer - Initiate the new transfer
* @mdev: Pointer to the Altera mSGDMA device structure
*/
static void msgdma_start_transfer(struct msgdma_device *mdev)
{
struct msgdma_sw_desc *desc;
if (!mdev->idle)
return;
desc = list_first_entry_or_null(&mdev->pending_list,
struct msgdma_sw_desc, node);
if (!desc)
return;
list_splice_tail_init(&mdev->pending_list, &mdev->active_list);
msgdma_copy_desc_to_fifo(mdev, desc);
}
/**
* msgdma_issue_pending - Issue pending transactions
* @chan: DMA channel pointer
*/
static void msgdma_issue_pending(struct dma_chan *chan)
{
struct msgdma_device *mdev = to_mdev(chan);
unsigned long flags;
spin_lock_irqsave(&mdev->lock, flags);
msgdma_start_transfer(mdev);
spin_unlock_irqrestore(&mdev->lock, flags);
}
/**
* msgdma_chan_desc_cleanup - Cleanup the completed descriptors
* @mdev: Pointer to the Altera mSGDMA device structure
*/
static void msgdma_chan_desc_cleanup(struct msgdma_device *mdev)
{
struct msgdma_sw_desc *desc, *next;
list_for_each_entry_safe(desc, next, &mdev->done_list, node) {
struct dmaengine_desc_callback cb;
list_del(&desc->node);
dmaengine_desc_get_callback(&desc->async_tx, &cb);
if (dmaengine_desc_callback_valid(&cb)) {
spin_unlock(&mdev->lock);
dmaengine_desc_callback_invoke(&cb, NULL);
spin_lock(&mdev->lock);
}
/* Run any dependencies, then free the descriptor */
msgdma_free_descriptor(mdev, desc);
}
}
/**
* msgdma_complete_descriptor - Mark the active descriptor as complete
* @mdev: Pointer to the Altera mSGDMA device structure
*/
static void msgdma_complete_descriptor(struct msgdma_device *mdev)
{
struct msgdma_sw_desc *desc;
desc = list_first_entry_or_null(&mdev->active_list,
struct msgdma_sw_desc, node);
if (!desc)
return;
list_del(&desc->node);
dma_cookie_complete(&desc->async_tx);
list_add_tail(&desc->node, &mdev->done_list);
}
/**
* msgdma_free_descriptors - Free channel descriptors
* @mdev: Pointer to the Altera mSGDMA device structure
*/
static void msgdma_free_descriptors(struct msgdma_device *mdev)
{
msgdma_free_desc_list(mdev, &mdev->active_list);
msgdma_free_desc_list(mdev, &mdev->pending_list);
msgdma_free_desc_list(mdev, &mdev->done_list);
}
/**
* msgdma_free_chan_resources - Free channel resources
* @dchan: DMA channel pointer
*/
static void msgdma_free_chan_resources(struct dma_chan *dchan)
{
struct msgdma_device *mdev = to_mdev(dchan);
unsigned long flags;
spin_lock_irqsave(&mdev->lock, flags);
msgdma_free_descriptors(mdev);
spin_unlock_irqrestore(&mdev->lock, flags);
kfree(mdev->sw_desq);
}
/**
* msgdma_alloc_chan_resources - Allocate channel resources
* @dchan: DMA channel
*
* Return: Number of descriptors on success and failure value on error
*/
static int msgdma_alloc_chan_resources(struct dma_chan *dchan)
{
struct msgdma_device *mdev = to_mdev(dchan);
struct msgdma_sw_desc *desc;
int i;
mdev->sw_desq = kcalloc(MSGDMA_DESC_NUM, sizeof(*desc), GFP_NOWAIT);
if (!mdev->sw_desq)
return -ENOMEM;
mdev->idle = true;
mdev->desc_free_cnt = MSGDMA_DESC_NUM;
INIT_LIST_HEAD(&mdev->free_list);
for (i = 0; i < MSGDMA_DESC_NUM; i++) {
desc = mdev->sw_desq + i;
dma_async_tx_descriptor_init(&desc->async_tx, &mdev->dmachan);
desc->async_tx.tx_submit = msgdma_tx_submit;
list_add_tail(&desc->node, &mdev->free_list);
}
return MSGDMA_DESC_NUM;
}
/**
* msgdma_tasklet - Schedule completion tasklet
* @t: Pointer to the Altera sSGDMA channel structure
*/
static void msgdma_tasklet(struct tasklet_struct *t)
{
struct msgdma_device *mdev = from_tasklet(mdev, t, irq_tasklet);
u32 count;
u32 __maybe_unused size;
u32 __maybe_unused status;
unsigned long flags;
spin_lock_irqsave(&mdev->lock, flags);
if (mdev->resp) {
/* Read number of responses that are available */
count = ioread32(mdev->csr + MSGDMA_CSR_RESP_FILL_LEVEL);
dev_dbg(mdev->dev, "%s (%d): response count=%d\n",
__func__, __LINE__, count);
} else {
count = 1;
}
while (count--) {
/*
* Read both longwords to purge this response from the FIFO
* On Avalon-MM implementations, size and status do not
* have any real values, like transferred bytes or error
* bits. So we need to just drop these values.
*/
if (mdev->resp) {
size = ioread32(mdev->resp +
MSGDMA_RESP_BYTES_TRANSFERRED);
status = ioread32(mdev->resp +
MSGDMA_RESP_STATUS);
}
msgdma_complete_descriptor(mdev);
msgdma_chan_desc_cleanup(mdev);
}
spin_unlock_irqrestore(&mdev->lock, flags);
}
/**
* msgdma_irq_handler - Altera mSGDMA Interrupt handler
* @irq: IRQ number
* @data: Pointer to the Altera mSGDMA device structure
*
* Return: IRQ_HANDLED/IRQ_NONE
*/
static irqreturn_t msgdma_irq_handler(int irq, void *data)
{
struct msgdma_device *mdev = data;
u32 status;
status = ioread32(mdev->csr + MSGDMA_CSR_STATUS);
if ((status & MSGDMA_CSR_STAT_BUSY) == 0) {
/* Start next transfer if the DMA controller is idle */
spin_lock(&mdev->lock);
mdev->idle = true;
msgdma_start_transfer(mdev);
spin_unlock(&mdev->lock);
}
tasklet_schedule(&mdev->irq_tasklet);
/* Clear interrupt in mSGDMA controller */
iowrite32(MSGDMA_CSR_STAT_IRQ, mdev->csr + MSGDMA_CSR_STATUS);
return IRQ_HANDLED;
}
/**
* msgdma_dev_remove() - Device remove function
* @mdev: Pointer to the Altera mSGDMA device structure
*/
static void msgdma_dev_remove(struct msgdma_device *mdev)
{
if (!mdev)
return;
devm_free_irq(mdev->dev, mdev->irq, mdev);
tasklet_kill(&mdev->irq_tasklet);
list_del(&mdev->dmachan.device_node);
}
static int request_and_map(struct platform_device *pdev, const char *name,
struct resource **res, void __iomem **ptr,
bool optional)
{
struct resource *region;
struct device *device = &pdev->dev;
*res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
if (*res == NULL) {
if (optional) {
*ptr = NULL;
dev_info(device, "optional resource %s not defined\n",
name);
return 0;
}
dev_err(device, "mandatory resource %s not defined\n", name);
return -ENODEV;
}
region = devm_request_mem_region(device, (*res)->start,
resource_size(*res), dev_name(device));
if (region == NULL) {
dev_err(device, "unable to request %s\n", name);
return -EBUSY;
}
*ptr = devm_ioremap(device, region->start,
resource_size(region));
if (*ptr == NULL) {
dev_err(device, "ioremap of %s failed!", name);
return -ENOMEM;
}
return 0;
}
/**
* msgdma_probe - Driver probe function
* @pdev: Pointer to the platform_device structure
*
* Return: '0' on success and failure value on error
*/
static int msgdma_probe(struct platform_device *pdev)
{
struct msgdma_device *mdev;
struct dma_device *dma_dev;
struct resource *dma_res;
int ret;
mdev = devm_kzalloc(&pdev->dev, sizeof(*mdev), GFP_NOWAIT);
if (!mdev)
return -ENOMEM;
mdev->dev = &pdev->dev;
/* Map CSR space */
ret = request_and_map(pdev, "csr", &dma_res, &mdev->csr, false);
if (ret)
return ret;
/* Map (extended) descriptor space */
ret = request_and_map(pdev, "desc", &dma_res, &mdev->desc, false);
if (ret)
return ret;
/* Map response space */
ret = request_and_map(pdev, "resp", &dma_res, &mdev->resp, true);
if (ret)
return ret;
platform_set_drvdata(pdev, mdev);
/* Get interrupt nr from platform data */
mdev->irq = platform_get_irq(pdev, 0);
if (mdev->irq < 0)
return -ENXIO;
ret = devm_request_irq(&pdev->dev, mdev->irq, msgdma_irq_handler,
0, dev_name(&pdev->dev), mdev);
if (ret)
return ret;
tasklet_setup(&mdev->irq_tasklet, msgdma_tasklet);
dma_cookie_init(&mdev->dmachan);
spin_lock_init(&mdev->lock);
INIT_LIST_HEAD(&mdev->active_list);
INIT_LIST_HEAD(&mdev->pending_list);
INIT_LIST_HEAD(&mdev->done_list);
INIT_LIST_HEAD(&mdev->free_list);
dma_dev = &mdev->dmadev;
/* Set DMA capabilities */
dma_cap_zero(dma_dev->cap_mask);
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
dma_dev->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
dma_dev->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM) |
BIT(DMA_MEM_TO_MEM);
dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
/* Init DMA link list */
INIT_LIST_HEAD(&dma_dev->channels);
/* Set base routines */
dma_dev->device_tx_status = dma_cookie_status;
dma_dev->device_issue_pending = msgdma_issue_pending;
dma_dev->dev = &pdev->dev;
dma_dev->copy_align = DMAENGINE_ALIGN_4_BYTES;
dma_dev->device_prep_dma_memcpy = msgdma_prep_memcpy;
dma_dev->device_prep_slave_sg = msgdma_prep_slave_sg;
dma_dev->device_config = msgdma_dma_config;
dma_dev->device_alloc_chan_resources = msgdma_alloc_chan_resources;
dma_dev->device_free_chan_resources = msgdma_free_chan_resources;
mdev->dmachan.device = dma_dev;
list_add_tail(&mdev->dmachan.device_node, &dma_dev->channels);
/* Set DMA mask to 64 bits */
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (ret) {
dev_warn(&pdev->dev, "unable to set coherent mask to 64");
goto fail;
}
msgdma_reset(mdev);
ret = dma_async_device_register(dma_dev);
if (ret)
goto fail;
ret = of_dma_controller_register(pdev->dev.of_node,
of_dma_xlate_by_chan_id, dma_dev);
if (ret == -EINVAL)
dev_warn(&pdev->dev, "device was not probed from DT");
else if (ret && ret != -ENODEV)
goto fail;
dev_notice(&pdev->dev, "Altera mSGDMA driver probe success\n");
return 0;
fail:
msgdma_dev_remove(mdev);
return ret;
}
/**
* msgdma_remove() - Driver remove function
* @pdev: Pointer to the platform_device structure
*
* Return: Always '0'
*/
static int msgdma_remove(struct platform_device *pdev)
{
struct msgdma_device *mdev = platform_get_drvdata(pdev);
if (pdev->dev.of_node)
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&mdev->dmadev);
msgdma_dev_remove(mdev);
dev_notice(&pdev->dev, "Altera mSGDMA driver removed\n");
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id msgdma_match[] = {
{ .compatible = "altr,socfpga-msgdma", },
{ }
};
MODULE_DEVICE_TABLE(of, msgdma_match);
#endif
static struct platform_driver msgdma_driver = {
.driver = {
.name = "altera-msgdma",
.of_match_table = of_match_ptr(msgdma_match),
},
.probe = msgdma_probe,
.remove = msgdma_remove,
};
module_platform_driver(msgdma_driver);
MODULE_ALIAS("platform:altera-msgdma");
MODULE_DESCRIPTION("Altera mSGDMA driver");
MODULE_AUTHOR("Stefan Roese <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/altera-msgdma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) ST-Ericsson SA 2007-2010
* Author: Per Forlin <[email protected]> for ST-Ericsson
* Author: Jonas Aaberg <[email protected]> for ST-Ericsson
*/
#include <linux/kernel.h>
#include <linux/dmaengine.h>
#include "ste_dma40.h"
#include "ste_dma40_ll.h"
static u8 d40_width_to_bits(enum dma_slave_buswidth width)
{
if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
return STEDMA40_ESIZE_8_BIT;
else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
return STEDMA40_ESIZE_16_BIT;
else if (width == DMA_SLAVE_BUSWIDTH_8_BYTES)
return STEDMA40_ESIZE_64_BIT;
else
return STEDMA40_ESIZE_32_BIT;
}
/* Sets up proper LCSP1 and LCSP3 register for a logical channel */
void d40_log_cfg(struct stedma40_chan_cfg *cfg,
u32 *lcsp1, u32 *lcsp3)
{
u32 l3 = 0; /* dst */
u32 l1 = 0; /* src */
/* src is mem? -> increase address pos */
if (cfg->dir == DMA_MEM_TO_DEV ||
cfg->dir == DMA_MEM_TO_MEM)
l1 |= BIT(D40_MEM_LCSP1_SCFG_INCR_POS);
/* dst is mem? -> increase address pos */
if (cfg->dir == DMA_DEV_TO_MEM ||
cfg->dir == DMA_MEM_TO_MEM)
l3 |= BIT(D40_MEM_LCSP3_DCFG_INCR_POS);
/* src is hw? -> master port 1 */
if (cfg->dir == DMA_DEV_TO_MEM ||
cfg->dir == DMA_DEV_TO_DEV)
l1 |= BIT(D40_MEM_LCSP1_SCFG_MST_POS);
/* dst is hw? -> master port 1 */
if (cfg->dir == DMA_MEM_TO_DEV ||
cfg->dir == DMA_DEV_TO_DEV)
l3 |= BIT(D40_MEM_LCSP3_DCFG_MST_POS);
l3 |= BIT(D40_MEM_LCSP3_DCFG_EIM_POS);
l3 |= cfg->dst_info.psize << D40_MEM_LCSP3_DCFG_PSIZE_POS;
l3 |= d40_width_to_bits(cfg->dst_info.data_width)
<< D40_MEM_LCSP3_DCFG_ESIZE_POS;
l1 |= BIT(D40_MEM_LCSP1_SCFG_EIM_POS);
l1 |= cfg->src_info.psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
l1 |= d40_width_to_bits(cfg->src_info.data_width)
<< D40_MEM_LCSP1_SCFG_ESIZE_POS;
*lcsp1 = l1;
*lcsp3 = l3;
}
void d40_phy_cfg(struct stedma40_chan_cfg *cfg, u32 *src_cfg, u32 *dst_cfg)
{
u32 src = 0;
u32 dst = 0;
if ((cfg->dir == DMA_DEV_TO_MEM) ||
(cfg->dir == DMA_DEV_TO_DEV)) {
/* Set master port to 1 */
src |= BIT(D40_SREG_CFG_MST_POS);
src |= D40_TYPE_TO_EVENT(cfg->dev_type);
if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
src |= BIT(D40_SREG_CFG_PHY_TM_POS);
else
src |= 3 << D40_SREG_CFG_PHY_TM_POS;
}
if ((cfg->dir == DMA_MEM_TO_DEV) ||
(cfg->dir == DMA_DEV_TO_DEV)) {
/* Set master port to 1 */
dst |= BIT(D40_SREG_CFG_MST_POS);
dst |= D40_TYPE_TO_EVENT(cfg->dev_type);
if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
dst |= BIT(D40_SREG_CFG_PHY_TM_POS);
else
dst |= 3 << D40_SREG_CFG_PHY_TM_POS;
}
/* Interrupt on end of transfer for destination */
dst |= BIT(D40_SREG_CFG_TIM_POS);
/* Generate interrupt on error */
src |= BIT(D40_SREG_CFG_EIM_POS);
dst |= BIT(D40_SREG_CFG_EIM_POS);
/* PSIZE */
if (cfg->src_info.psize != STEDMA40_PSIZE_PHY_1) {
src |= BIT(D40_SREG_CFG_PHY_PEN_POS);
src |= cfg->src_info.psize << D40_SREG_CFG_PSIZE_POS;
}
if (cfg->dst_info.psize != STEDMA40_PSIZE_PHY_1) {
dst |= BIT(D40_SREG_CFG_PHY_PEN_POS);
dst |= cfg->dst_info.psize << D40_SREG_CFG_PSIZE_POS;
}
/* Element size */
src |= d40_width_to_bits(cfg->src_info.data_width)
<< D40_SREG_CFG_ESIZE_POS;
dst |= d40_width_to_bits(cfg->dst_info.data_width)
<< D40_SREG_CFG_ESIZE_POS;
/* Set the priority bit to high for the physical channel */
if (cfg->high_priority) {
src |= BIT(D40_SREG_CFG_PRI_POS);
dst |= BIT(D40_SREG_CFG_PRI_POS);
}
if (cfg->src_info.big_endian)
src |= BIT(D40_SREG_CFG_LBE_POS);
if (cfg->dst_info.big_endian)
dst |= BIT(D40_SREG_CFG_LBE_POS);
*src_cfg = src;
*dst_cfg = dst;
}
static int d40_phy_fill_lli(struct d40_phy_lli *lli,
dma_addr_t data,
u32 data_size,
dma_addr_t next_lli,
u32 reg_cfg,
struct stedma40_half_channel_info *info,
unsigned int flags)
{
bool addr_inc = flags & LLI_ADDR_INC;
bool term_int = flags & LLI_TERM_INT;
unsigned int data_width = info->data_width;
int psize = info->psize;
int num_elems;
if (psize == STEDMA40_PSIZE_PHY_1)
num_elems = 1;
else
num_elems = 2 << psize;
/* Must be aligned */
if (!IS_ALIGNED(data, data_width))
return -EINVAL;
/* Transfer size can't be smaller than (num_elms * elem_size) */
if (data_size < num_elems * data_width)
return -EINVAL;
/* The number of elements. IE now many chunks */
lli->reg_elt = (data_size / data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
/*
* Distance to next element sized entry.
* Usually the size of the element unless you want gaps.
*/
if (addr_inc)
lli->reg_elt |= data_width << D40_SREG_ELEM_PHY_EIDX_POS;
/* Where the data is */
lli->reg_ptr = data;
lli->reg_cfg = reg_cfg;
/* If this scatter list entry is the last one, no next link */
if (next_lli == 0)
lli->reg_lnk = BIT(D40_SREG_LNK_PHY_TCP_POS);
else
lli->reg_lnk = next_lli;
/* Set/clear interrupt generation on this link item.*/
if (term_int)
lli->reg_cfg |= BIT(D40_SREG_CFG_TIM_POS);
else
lli->reg_cfg &= ~BIT(D40_SREG_CFG_TIM_POS);
/*
* Post link - D40_SREG_LNK_PHY_PRE_POS = 0
* Relink happens after transfer completion.
*/
return 0;
}
static int d40_seg_size(int size, int data_width1, int data_width2)
{
u32 max_w = max(data_width1, data_width2);
u32 min_w = min(data_width1, data_width2);
u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
if (seg_max > STEDMA40_MAX_SEG_SIZE)
seg_max -= max_w;
if (size <= seg_max)
return size;
if (size <= 2 * seg_max)
return ALIGN(size / 2, max_w);
return seg_max;
}
static struct d40_phy_lli *
d40_phy_buf_to_lli(struct d40_phy_lli *lli, dma_addr_t addr, u32 size,
dma_addr_t lli_phys, dma_addr_t first_phys, u32 reg_cfg,
struct stedma40_half_channel_info *info,
struct stedma40_half_channel_info *otherinfo,
unsigned long flags)
{
bool lastlink = flags & LLI_LAST_LINK;
bool addr_inc = flags & LLI_ADDR_INC;
bool term_int = flags & LLI_TERM_INT;
bool cyclic = flags & LLI_CYCLIC;
int err;
dma_addr_t next = lli_phys;
int size_rest = size;
int size_seg = 0;
/*
* This piece may be split up based on d40_seg_size(); we only want the
* term int on the last part.
*/
if (term_int)
flags &= ~LLI_TERM_INT;
do {
size_seg = d40_seg_size(size_rest, info->data_width,
otherinfo->data_width);
size_rest -= size_seg;
if (size_rest == 0 && term_int)
flags |= LLI_TERM_INT;
if (size_rest == 0 && lastlink)
next = cyclic ? first_phys : 0;
else
next = ALIGN(next + sizeof(struct d40_phy_lli),
D40_LLI_ALIGN);
err = d40_phy_fill_lli(lli, addr, size_seg, next,
reg_cfg, info, flags);
if (err)
goto err;
lli++;
if (addr_inc)
addr += size_seg;
} while (size_rest);
return lli;
err:
return NULL;
}
int d40_phy_sg_to_lli(struct scatterlist *sg,
int sg_len,
dma_addr_t target,
struct d40_phy_lli *lli_sg,
dma_addr_t lli_phys,
u32 reg_cfg,
struct stedma40_half_channel_info *info,
struct stedma40_half_channel_info *otherinfo,
unsigned long flags)
{
int total_size = 0;
int i;
struct scatterlist *current_sg = sg;
struct d40_phy_lli *lli = lli_sg;
dma_addr_t l_phys = lli_phys;
if (!target)
flags |= LLI_ADDR_INC;
for_each_sg(sg, current_sg, sg_len, i) {
dma_addr_t sg_addr = sg_dma_address(current_sg);
unsigned int len = sg_dma_len(current_sg);
dma_addr_t dst = target ?: sg_addr;
total_size += sg_dma_len(current_sg);
if (i == sg_len - 1)
flags |= LLI_TERM_INT | LLI_LAST_LINK;
l_phys = ALIGN(lli_phys + (lli - lli_sg) *
sizeof(struct d40_phy_lli), D40_LLI_ALIGN);
lli = d40_phy_buf_to_lli(lli, dst, len, l_phys, lli_phys,
reg_cfg, info, otherinfo, flags);
if (lli == NULL)
return -EINVAL;
}
return total_size;
}
/* DMA logical lli operations */
static void d40_log_lli_link(struct d40_log_lli *lli_dst,
struct d40_log_lli *lli_src,
int next, unsigned int flags)
{
bool interrupt = flags & LLI_TERM_INT;
u32 slos = 0;
u32 dlos = 0;
if (next != -EINVAL) {
slos = next * 2;
dlos = next * 2 + 1;
}
if (interrupt) {
lli_dst->lcsp13 |= D40_MEM_LCSP1_SCFG_TIM_MASK;
lli_dst->lcsp13 |= D40_MEM_LCSP3_DTCP_MASK;
}
lli_src->lcsp13 = (lli_src->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
(slos << D40_MEM_LCSP1_SLOS_POS);
lli_dst->lcsp13 = (lli_dst->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
(dlos << D40_MEM_LCSP1_SLOS_POS);
}
void d40_log_lli_lcpa_write(struct d40_log_lli_full *lcpa,
struct d40_log_lli *lli_dst,
struct d40_log_lli *lli_src,
int next, unsigned int flags)
{
d40_log_lli_link(lli_dst, lli_src, next, flags);
writel_relaxed(lli_src->lcsp02, &lcpa[0].lcsp0);
writel_relaxed(lli_src->lcsp13, &lcpa[0].lcsp1);
writel_relaxed(lli_dst->lcsp02, &lcpa[0].lcsp2);
writel_relaxed(lli_dst->lcsp13, &lcpa[0].lcsp3);
}
void d40_log_lli_lcla_write(struct d40_log_lli *lcla,
struct d40_log_lli *lli_dst,
struct d40_log_lli *lli_src,
int next, unsigned int flags)
{
d40_log_lli_link(lli_dst, lli_src, next, flags);
writel_relaxed(lli_src->lcsp02, &lcla[0].lcsp02);
writel_relaxed(lli_src->lcsp13, &lcla[0].lcsp13);
writel_relaxed(lli_dst->lcsp02, &lcla[1].lcsp02);
writel_relaxed(lli_dst->lcsp13, &lcla[1].lcsp13);
}
static void d40_log_fill_lli(struct d40_log_lli *lli,
dma_addr_t data, u32 data_size,
u32 reg_cfg,
u32 data_width,
unsigned int flags)
{
bool addr_inc = flags & LLI_ADDR_INC;
lli->lcsp13 = reg_cfg;
/* The number of elements to transfer */
lli->lcsp02 = ((data_size / data_width) <<
D40_MEM_LCSP0_ECNT_POS) & D40_MEM_LCSP0_ECNT_MASK;
BUG_ON((data_size / data_width) > STEDMA40_MAX_SEG_SIZE);
/* 16 LSBs address of the current element */
lli->lcsp02 |= data & D40_MEM_LCSP0_SPTR_MASK;
/* 16 MSBs address of the current element */
lli->lcsp13 |= data & D40_MEM_LCSP1_SPTR_MASK;
if (addr_inc)
lli->lcsp13 |= D40_MEM_LCSP1_SCFG_INCR_MASK;
}
static struct d40_log_lli *d40_log_buf_to_lli(struct d40_log_lli *lli_sg,
dma_addr_t addr,
int size,
u32 lcsp13, /* src or dst*/
u32 data_width1,
u32 data_width2,
unsigned int flags)
{
bool addr_inc = flags & LLI_ADDR_INC;
struct d40_log_lli *lli = lli_sg;
int size_rest = size;
int size_seg = 0;
do {
size_seg = d40_seg_size(size_rest, data_width1, data_width2);
size_rest -= size_seg;
d40_log_fill_lli(lli,
addr,
size_seg,
lcsp13, data_width1,
flags);
if (addr_inc)
addr += size_seg;
lli++;
} while (size_rest);
return lli;
}
int d40_log_sg_to_lli(struct scatterlist *sg,
int sg_len,
dma_addr_t dev_addr,
struct d40_log_lli *lli_sg,
u32 lcsp13, /* src or dst*/
u32 data_width1, u32 data_width2)
{
int total_size = 0;
struct scatterlist *current_sg = sg;
int i;
struct d40_log_lli *lli = lli_sg;
unsigned long flags = 0;
if (!dev_addr)
flags |= LLI_ADDR_INC;
for_each_sg(sg, current_sg, sg_len, i) {
dma_addr_t sg_addr = sg_dma_address(current_sg);
unsigned int len = sg_dma_len(current_sg);
dma_addr_t addr = dev_addr ?: sg_addr;
total_size += sg_dma_len(current_sg);
lli = d40_log_buf_to_lli(lli, addr, len,
lcsp13,
data_width1,
data_width2,
flags);
}
return total_size;
}
| linux-master | drivers/dma/ste_dma40_ll.c |
// SPDX-License-Identifier: GPL-2.0
// Copyright 2014-2015 Freescale
// Copyright 2018 NXP
/*
* Driver for NXP Layerscape Queue Direct Memory Access Controller
*
* Author:
* Wen He <[email protected]>
* Jiaheng Fan <[email protected]>
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include "virt-dma.h"
#include "fsldma.h"
/* Register related definition */
#define FSL_QDMA_DMR 0x0
#define FSL_QDMA_DSR 0x4
#define FSL_QDMA_DEIER 0xe00
#define FSL_QDMA_DEDR 0xe04
#define FSL_QDMA_DECFDW0R 0xe10
#define FSL_QDMA_DECFDW1R 0xe14
#define FSL_QDMA_DECFDW2R 0xe18
#define FSL_QDMA_DECFDW3R 0xe1c
#define FSL_QDMA_DECFQIDR 0xe30
#define FSL_QDMA_DECBR 0xe34
#define FSL_QDMA_BCQMR(x) (0xc0 + 0x100 * (x))
#define FSL_QDMA_BCQSR(x) (0xc4 + 0x100 * (x))
#define FSL_QDMA_BCQEDPA_SADDR(x) (0xc8 + 0x100 * (x))
#define FSL_QDMA_BCQDPA_SADDR(x) (0xcc + 0x100 * (x))
#define FSL_QDMA_BCQEEPA_SADDR(x) (0xd0 + 0x100 * (x))
#define FSL_QDMA_BCQEPA_SADDR(x) (0xd4 + 0x100 * (x))
#define FSL_QDMA_BCQIER(x) (0xe0 + 0x100 * (x))
#define FSL_QDMA_BCQIDR(x) (0xe4 + 0x100 * (x))
#define FSL_QDMA_SQDPAR 0x80c
#define FSL_QDMA_SQEPAR 0x814
#define FSL_QDMA_BSQMR 0x800
#define FSL_QDMA_BSQSR 0x804
#define FSL_QDMA_BSQICR 0x828
#define FSL_QDMA_CQMR 0xa00
#define FSL_QDMA_CQDSCR1 0xa08
#define FSL_QDMA_CQDSCR2 0xa0c
#define FSL_QDMA_CQIER 0xa10
#define FSL_QDMA_CQEDR 0xa14
#define FSL_QDMA_SQCCMR 0xa20
/* Registers for bit and genmask */
#define FSL_QDMA_CQIDR_SQT BIT(15)
#define QDMA_CCDF_FORMAT BIT(29)
#define QDMA_CCDF_SER BIT(30)
#define QDMA_SG_FIN BIT(30)
#define QDMA_SG_LEN_MASK GENMASK(29, 0)
#define QDMA_CCDF_MASK GENMASK(28, 20)
#define FSL_QDMA_DEDR_CLEAR GENMASK(31, 0)
#define FSL_QDMA_BCQIDR_CLEAR GENMASK(31, 0)
#define FSL_QDMA_DEIER_CLEAR GENMASK(31, 0)
#define FSL_QDMA_BCQIER_CQTIE BIT(15)
#define FSL_QDMA_BCQIER_CQPEIE BIT(23)
#define FSL_QDMA_BSQICR_ICEN BIT(31)
#define FSL_QDMA_BSQICR_ICST(x) ((x) << 16)
#define FSL_QDMA_CQIER_MEIE BIT(31)
#define FSL_QDMA_CQIER_TEIE BIT(0)
#define FSL_QDMA_SQCCMR_ENTER_WM BIT(21)
#define FSL_QDMA_BCQMR_EN BIT(31)
#define FSL_QDMA_BCQMR_EI BIT(30)
#define FSL_QDMA_BCQMR_CD_THLD(x) ((x) << 20)
#define FSL_QDMA_BCQMR_CQ_SIZE(x) ((x) << 16)
#define FSL_QDMA_BCQSR_QF BIT(16)
#define FSL_QDMA_BCQSR_XOFF BIT(0)
#define FSL_QDMA_BSQMR_EN BIT(31)
#define FSL_QDMA_BSQMR_DI BIT(30)
#define FSL_QDMA_BSQMR_CQ_SIZE(x) ((x) << 16)
#define FSL_QDMA_BSQSR_QE BIT(17)
#define FSL_QDMA_DMR_DQD BIT(30)
#define FSL_QDMA_DSR_DB BIT(31)
/* Size related definition */
#define FSL_QDMA_QUEUE_MAX 8
#define FSL_QDMA_COMMAND_BUFFER_SIZE 64
#define FSL_QDMA_DESCRIPTOR_BUFFER_SIZE 32
#define FSL_QDMA_CIRCULAR_DESC_SIZE_MIN 64
#define FSL_QDMA_CIRCULAR_DESC_SIZE_MAX 16384
#define FSL_QDMA_QUEUE_NUM_MAX 8
/* Field definition for CMD */
#define FSL_QDMA_CMD_RWTTYPE 0x4
#define FSL_QDMA_CMD_LWC 0x2
#define FSL_QDMA_CMD_RWTTYPE_OFFSET 28
#define FSL_QDMA_CMD_NS_OFFSET 27
#define FSL_QDMA_CMD_DQOS_OFFSET 24
#define FSL_QDMA_CMD_WTHROTL_OFFSET 20
#define FSL_QDMA_CMD_DSEN_OFFSET 19
#define FSL_QDMA_CMD_LWC_OFFSET 16
/* Field definition for Descriptor status */
#define QDMA_CCDF_STATUS_RTE BIT(5)
#define QDMA_CCDF_STATUS_WTE BIT(4)
#define QDMA_CCDF_STATUS_CDE BIT(2)
#define QDMA_CCDF_STATUS_SDE BIT(1)
#define QDMA_CCDF_STATUS_DDE BIT(0)
#define QDMA_CCDF_STATUS_MASK (QDMA_CCDF_STATUS_RTE | \
QDMA_CCDF_STATUS_WTE | \
QDMA_CCDF_STATUS_CDE | \
QDMA_CCDF_STATUS_SDE | \
QDMA_CCDF_STATUS_DDE)
/* Field definition for Descriptor offset */
#define QDMA_CCDF_OFFSET 20
#define QDMA_SDDF_CMD(x) (((u64)(x)) << 32)
/* Field definition for safe loop count*/
#define FSL_QDMA_HALT_COUNT 1500
#define FSL_QDMA_MAX_SIZE 16385
#define FSL_QDMA_COMP_TIMEOUT 1000
#define FSL_COMMAND_QUEUE_OVERFLLOW 10
#define FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma_engine, x) \
(((fsl_qdma_engine)->block_offset) * (x))
/**
* struct fsl_qdma_format - This is the struct holding describing compound
* descriptor format with qDMA.
* @status: Command status and enqueue status notification.
* @cfg: Frame offset and frame format.
* @addr_lo: Holding the compound descriptor of the lower
* 32-bits address in memory 40-bit address.
* @addr_hi: Same as above member, but point high 8-bits in
* memory 40-bit address.
* @__reserved1: Reserved field.
* @cfg8b_w1: Compound descriptor command queue origin produced
* by qDMA and dynamic debug field.
* @data: Pointer to the memory 40-bit address, describes DMA
* source information and DMA destination information.
*/
struct fsl_qdma_format {
__le32 status;
__le32 cfg;
union {
struct {
__le32 addr_lo;
u8 addr_hi;
u8 __reserved1[2];
u8 cfg8b_w1;
} __packed;
__le64 data;
};
} __packed;
/* qDMA status notification pre information */
struct fsl_pre_status {
u64 addr;
u8 queue;
};
static DEFINE_PER_CPU(struct fsl_pre_status, pre);
struct fsl_qdma_chan {
struct virt_dma_chan vchan;
struct virt_dma_desc vdesc;
enum dma_status status;
struct fsl_qdma_engine *qdma;
struct fsl_qdma_queue *queue;
};
struct fsl_qdma_queue {
struct fsl_qdma_format *virt_head;
struct fsl_qdma_format *virt_tail;
struct list_head comp_used;
struct list_head comp_free;
struct dma_pool *comp_pool;
struct dma_pool *desc_pool;
spinlock_t queue_lock;
dma_addr_t bus_addr;
u32 n_cq;
u32 id;
struct fsl_qdma_format *cq;
void __iomem *block_base;
};
struct fsl_qdma_comp {
dma_addr_t bus_addr;
dma_addr_t desc_bus_addr;
struct fsl_qdma_format *virt_addr;
struct fsl_qdma_format *desc_virt_addr;
struct fsl_qdma_chan *qchan;
struct virt_dma_desc vdesc;
struct list_head list;
};
struct fsl_qdma_engine {
struct dma_device dma_dev;
void __iomem *ctrl_base;
void __iomem *status_base;
void __iomem *block_base;
u32 n_chans;
u32 n_queues;
struct mutex fsl_qdma_mutex;
int error_irq;
int *queue_irq;
u32 feature;
struct fsl_qdma_queue *queue;
struct fsl_qdma_queue **status;
struct fsl_qdma_chan *chans;
int block_number;
int block_offset;
int irq_base;
int desc_allocated;
};
static inline u64
qdma_ccdf_addr_get64(const struct fsl_qdma_format *ccdf)
{
return le64_to_cpu(ccdf->data) & (U64_MAX >> 24);
}
static inline void
qdma_desc_addr_set64(struct fsl_qdma_format *ccdf, u64 addr)
{
ccdf->addr_hi = upper_32_bits(addr);
ccdf->addr_lo = cpu_to_le32(lower_32_bits(addr));
}
static inline u8
qdma_ccdf_get_queue(const struct fsl_qdma_format *ccdf)
{
return ccdf->cfg8b_w1 & U8_MAX;
}
static inline int
qdma_ccdf_get_offset(const struct fsl_qdma_format *ccdf)
{
return (le32_to_cpu(ccdf->cfg) & QDMA_CCDF_MASK) >> QDMA_CCDF_OFFSET;
}
static inline void
qdma_ccdf_set_format(struct fsl_qdma_format *ccdf, int offset)
{
ccdf->cfg = cpu_to_le32(QDMA_CCDF_FORMAT |
(offset << QDMA_CCDF_OFFSET));
}
static inline int
qdma_ccdf_get_status(const struct fsl_qdma_format *ccdf)
{
return (le32_to_cpu(ccdf->status) & QDMA_CCDF_STATUS_MASK);
}
static inline void
qdma_ccdf_set_ser(struct fsl_qdma_format *ccdf, int status)
{
ccdf->status = cpu_to_le32(QDMA_CCDF_SER | status);
}
static inline void qdma_csgf_set_len(struct fsl_qdma_format *csgf, int len)
{
csgf->cfg = cpu_to_le32(len & QDMA_SG_LEN_MASK);
}
static inline void qdma_csgf_set_f(struct fsl_qdma_format *csgf, int len)
{
csgf->cfg = cpu_to_le32(QDMA_SG_FIN | (len & QDMA_SG_LEN_MASK));
}
static u32 qdma_readl(struct fsl_qdma_engine *qdma, void __iomem *addr)
{
return FSL_DMA_IN(qdma, addr, 32);
}
static void qdma_writel(struct fsl_qdma_engine *qdma, u32 val,
void __iomem *addr)
{
FSL_DMA_OUT(qdma, addr, val, 32);
}
static struct fsl_qdma_chan *to_fsl_qdma_chan(struct dma_chan *chan)
{
return container_of(chan, struct fsl_qdma_chan, vchan.chan);
}
static struct fsl_qdma_comp *to_fsl_qdma_comp(struct virt_dma_desc *vd)
{
return container_of(vd, struct fsl_qdma_comp, vdesc);
}
static void fsl_qdma_free_chan_resources(struct dma_chan *chan)
{
struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
struct fsl_qdma_engine *fsl_qdma = fsl_chan->qdma;
struct fsl_qdma_comp *comp_temp, *_comp_temp;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
vchan_get_all_descriptors(&fsl_chan->vchan, &head);
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
if (!fsl_queue->comp_pool && !fsl_queue->desc_pool)
return;
list_for_each_entry_safe(comp_temp, _comp_temp,
&fsl_queue->comp_used, list) {
dma_pool_free(fsl_queue->comp_pool,
comp_temp->virt_addr,
comp_temp->bus_addr);
dma_pool_free(fsl_queue->desc_pool,
comp_temp->desc_virt_addr,
comp_temp->desc_bus_addr);
list_del(&comp_temp->list);
kfree(comp_temp);
}
list_for_each_entry_safe(comp_temp, _comp_temp,
&fsl_queue->comp_free, list) {
dma_pool_free(fsl_queue->comp_pool,
comp_temp->virt_addr,
comp_temp->bus_addr);
dma_pool_free(fsl_queue->desc_pool,
comp_temp->desc_virt_addr,
comp_temp->desc_bus_addr);
list_del(&comp_temp->list);
kfree(comp_temp);
}
dma_pool_destroy(fsl_queue->comp_pool);
dma_pool_destroy(fsl_queue->desc_pool);
fsl_qdma->desc_allocated--;
fsl_queue->comp_pool = NULL;
fsl_queue->desc_pool = NULL;
}
static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp,
dma_addr_t dst, dma_addr_t src, u32 len)
{
u32 cmd;
struct fsl_qdma_format *sdf, *ddf;
struct fsl_qdma_format *ccdf, *csgf_desc, *csgf_src, *csgf_dest;
ccdf = fsl_comp->virt_addr;
csgf_desc = fsl_comp->virt_addr + 1;
csgf_src = fsl_comp->virt_addr + 2;
csgf_dest = fsl_comp->virt_addr + 3;
sdf = fsl_comp->desc_virt_addr;
ddf = fsl_comp->desc_virt_addr + 1;
memset(fsl_comp->virt_addr, 0, FSL_QDMA_COMMAND_BUFFER_SIZE);
memset(fsl_comp->desc_virt_addr, 0, FSL_QDMA_DESCRIPTOR_BUFFER_SIZE);
/* Head Command Descriptor(Frame Descriptor) */
qdma_desc_addr_set64(ccdf, fsl_comp->bus_addr + 16);
qdma_ccdf_set_format(ccdf, qdma_ccdf_get_offset(ccdf));
qdma_ccdf_set_ser(ccdf, qdma_ccdf_get_status(ccdf));
/* Status notification is enqueued to status queue. */
/* Compound Command Descriptor(Frame List Table) */
qdma_desc_addr_set64(csgf_desc, fsl_comp->desc_bus_addr);
/* It must be 32 as Compound S/G Descriptor */
qdma_csgf_set_len(csgf_desc, 32);
qdma_desc_addr_set64(csgf_src, src);
qdma_csgf_set_len(csgf_src, len);
qdma_desc_addr_set64(csgf_dest, dst);
qdma_csgf_set_len(csgf_dest, len);
/* This entry is the last entry. */
qdma_csgf_set_f(csgf_dest, len);
/* Descriptor Buffer */
cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE <<
FSL_QDMA_CMD_RWTTYPE_OFFSET);
sdf->data = QDMA_SDDF_CMD(cmd);
cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE <<
FSL_QDMA_CMD_RWTTYPE_OFFSET);
cmd |= cpu_to_le32(FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET);
ddf->data = QDMA_SDDF_CMD(cmd);
}
/*
* Pre-request full command descriptor for enqueue.
*/
static int fsl_qdma_pre_request_enqueue_desc(struct fsl_qdma_queue *queue)
{
int i;
struct fsl_qdma_comp *comp_temp, *_comp_temp;
for (i = 0; i < queue->n_cq + FSL_COMMAND_QUEUE_OVERFLLOW; i++) {
comp_temp = kzalloc(sizeof(*comp_temp), GFP_KERNEL);
if (!comp_temp)
goto err_alloc;
comp_temp->virt_addr =
dma_pool_alloc(queue->comp_pool, GFP_KERNEL,
&comp_temp->bus_addr);
if (!comp_temp->virt_addr)
goto err_dma_alloc;
comp_temp->desc_virt_addr =
dma_pool_alloc(queue->desc_pool, GFP_KERNEL,
&comp_temp->desc_bus_addr);
if (!comp_temp->desc_virt_addr)
goto err_desc_dma_alloc;
list_add_tail(&comp_temp->list, &queue->comp_free);
}
return 0;
err_desc_dma_alloc:
dma_pool_free(queue->comp_pool, comp_temp->virt_addr,
comp_temp->bus_addr);
err_dma_alloc:
kfree(comp_temp);
err_alloc:
list_for_each_entry_safe(comp_temp, _comp_temp,
&queue->comp_free, list) {
if (comp_temp->virt_addr)
dma_pool_free(queue->comp_pool,
comp_temp->virt_addr,
comp_temp->bus_addr);
if (comp_temp->desc_virt_addr)
dma_pool_free(queue->desc_pool,
comp_temp->desc_virt_addr,
comp_temp->desc_bus_addr);
list_del(&comp_temp->list);
kfree(comp_temp);
}
return -ENOMEM;
}
/*
* Request a command descriptor for enqueue.
*/
static struct fsl_qdma_comp
*fsl_qdma_request_enqueue_desc(struct fsl_qdma_chan *fsl_chan)
{
unsigned long flags;
struct fsl_qdma_comp *comp_temp;
int timeout = FSL_QDMA_COMP_TIMEOUT;
struct fsl_qdma_queue *queue = fsl_chan->queue;
while (timeout--) {
spin_lock_irqsave(&queue->queue_lock, flags);
if (!list_empty(&queue->comp_free)) {
comp_temp = list_first_entry(&queue->comp_free,
struct fsl_qdma_comp,
list);
list_del(&comp_temp->list);
spin_unlock_irqrestore(&queue->queue_lock, flags);
comp_temp->qchan = fsl_chan;
return comp_temp;
}
spin_unlock_irqrestore(&queue->queue_lock, flags);
udelay(1);
}
return NULL;
}
static struct fsl_qdma_queue
*fsl_qdma_alloc_queue_resources(struct platform_device *pdev,
struct fsl_qdma_engine *fsl_qdma)
{
int ret, len, i, j;
int queue_num, block_number;
unsigned int queue_size[FSL_QDMA_QUEUE_MAX];
struct fsl_qdma_queue *queue_head, *queue_temp;
queue_num = fsl_qdma->n_queues;
block_number = fsl_qdma->block_number;
if (queue_num > FSL_QDMA_QUEUE_MAX)
queue_num = FSL_QDMA_QUEUE_MAX;
len = sizeof(*queue_head) * queue_num * block_number;
queue_head = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
if (!queue_head)
return NULL;
ret = device_property_read_u32_array(&pdev->dev, "queue-sizes",
queue_size, queue_num);
if (ret) {
dev_err(&pdev->dev, "Can't get queue-sizes.\n");
return NULL;
}
for (j = 0; j < block_number; j++) {
for (i = 0; i < queue_num; i++) {
if (queue_size[i] > FSL_QDMA_CIRCULAR_DESC_SIZE_MAX ||
queue_size[i] < FSL_QDMA_CIRCULAR_DESC_SIZE_MIN) {
dev_err(&pdev->dev,
"Get wrong queue-sizes.\n");
return NULL;
}
queue_temp = queue_head + i + (j * queue_num);
queue_temp->cq =
dma_alloc_coherent(&pdev->dev,
sizeof(struct fsl_qdma_format) *
queue_size[i],
&queue_temp->bus_addr,
GFP_KERNEL);
if (!queue_temp->cq)
return NULL;
queue_temp->block_base = fsl_qdma->block_base +
FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
queue_temp->n_cq = queue_size[i];
queue_temp->id = i;
queue_temp->virt_head = queue_temp->cq;
queue_temp->virt_tail = queue_temp->cq;
/*
* List for queue command buffer
*/
INIT_LIST_HEAD(&queue_temp->comp_used);
spin_lock_init(&queue_temp->queue_lock);
}
}
return queue_head;
}
static struct fsl_qdma_queue
*fsl_qdma_prep_status_queue(struct platform_device *pdev)
{
int ret;
unsigned int status_size;
struct fsl_qdma_queue *status_head;
struct device_node *np = pdev->dev.of_node;
ret = of_property_read_u32(np, "status-sizes", &status_size);
if (ret) {
dev_err(&pdev->dev, "Can't get status-sizes.\n");
return NULL;
}
if (status_size > FSL_QDMA_CIRCULAR_DESC_SIZE_MAX ||
status_size < FSL_QDMA_CIRCULAR_DESC_SIZE_MIN) {
dev_err(&pdev->dev, "Get wrong status_size.\n");
return NULL;
}
status_head = devm_kzalloc(&pdev->dev,
sizeof(*status_head), GFP_KERNEL);
if (!status_head)
return NULL;
/*
* Buffer for queue command
*/
status_head->cq = dma_alloc_coherent(&pdev->dev,
sizeof(struct fsl_qdma_format) *
status_size,
&status_head->bus_addr,
GFP_KERNEL);
if (!status_head->cq) {
devm_kfree(&pdev->dev, status_head);
return NULL;
}
status_head->n_cq = status_size;
status_head->virt_head = status_head->cq;
status_head->virt_tail = status_head->cq;
status_head->comp_pool = NULL;
return status_head;
}
static int fsl_qdma_halt(struct fsl_qdma_engine *fsl_qdma)
{
u32 reg;
int i, j, count = FSL_QDMA_HALT_COUNT;
void __iomem *block, *ctrl = fsl_qdma->ctrl_base;
/* Disable the command queue and wait for idle state. */
reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
reg |= FSL_QDMA_DMR_DQD;
qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
for (j = 0; j < fsl_qdma->block_number; j++) {
block = fsl_qdma->block_base +
FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
for (i = 0; i < FSL_QDMA_QUEUE_NUM_MAX; i++)
qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BCQMR(i));
}
while (1) {
reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DSR);
if (!(reg & FSL_QDMA_DSR_DB))
break;
if (count-- < 0)
return -EBUSY;
udelay(100);
}
for (j = 0; j < fsl_qdma->block_number; j++) {
block = fsl_qdma->block_base +
FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
/* Disable status queue. */
qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BSQMR);
/*
* clear the command queue interrupt detect register for
* all queues.
*/
qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
block + FSL_QDMA_BCQIDR(0));
}
return 0;
}
static int
fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma,
void *block,
int id)
{
bool duplicate;
u32 reg, i, count;
u8 completion_status;
struct fsl_qdma_queue *temp_queue;
struct fsl_qdma_format *status_addr;
struct fsl_qdma_comp *fsl_comp = NULL;
struct fsl_qdma_queue *fsl_queue = fsl_qdma->queue;
struct fsl_qdma_queue *fsl_status = fsl_qdma->status[id];
count = FSL_QDMA_MAX_SIZE;
while (count--) {
duplicate = 0;
reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQSR);
if (reg & FSL_QDMA_BSQSR_QE)
return 0;
status_addr = fsl_status->virt_head;
if (qdma_ccdf_get_queue(status_addr) ==
__this_cpu_read(pre.queue) &&
qdma_ccdf_addr_get64(status_addr) ==
__this_cpu_read(pre.addr))
duplicate = 1;
i = qdma_ccdf_get_queue(status_addr) +
id * fsl_qdma->n_queues;
__this_cpu_write(pre.addr, qdma_ccdf_addr_get64(status_addr));
__this_cpu_write(pre.queue, qdma_ccdf_get_queue(status_addr));
temp_queue = fsl_queue + i;
spin_lock(&temp_queue->queue_lock);
if (list_empty(&temp_queue->comp_used)) {
if (!duplicate) {
spin_unlock(&temp_queue->queue_lock);
return -EAGAIN;
}
} else {
fsl_comp = list_first_entry(&temp_queue->comp_used,
struct fsl_qdma_comp, list);
if (fsl_comp->bus_addr + 16 !=
__this_cpu_read(pre.addr)) {
if (!duplicate) {
spin_unlock(&temp_queue->queue_lock);
return -EAGAIN;
}
}
}
if (duplicate) {
reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQMR);
reg |= FSL_QDMA_BSQMR_DI;
qdma_desc_addr_set64(status_addr, 0x0);
fsl_status->virt_head++;
if (fsl_status->virt_head == fsl_status->cq
+ fsl_status->n_cq)
fsl_status->virt_head = fsl_status->cq;
qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
spin_unlock(&temp_queue->queue_lock);
continue;
}
list_del(&fsl_comp->list);
completion_status = qdma_ccdf_get_status(status_addr);
reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQMR);
reg |= FSL_QDMA_BSQMR_DI;
qdma_desc_addr_set64(status_addr, 0x0);
fsl_status->virt_head++;
if (fsl_status->virt_head == fsl_status->cq + fsl_status->n_cq)
fsl_status->virt_head = fsl_status->cq;
qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
spin_unlock(&temp_queue->queue_lock);
/* The completion_status is evaluated here
* (outside of spin lock)
*/
if (completion_status) {
/* A completion error occurred! */
if (completion_status & QDMA_CCDF_STATUS_WTE) {
/* Write transaction error */
fsl_comp->vdesc.tx_result.result =
DMA_TRANS_WRITE_FAILED;
} else if (completion_status & QDMA_CCDF_STATUS_RTE) {
/* Read transaction error */
fsl_comp->vdesc.tx_result.result =
DMA_TRANS_READ_FAILED;
} else {
/* Command/source/destination
* description error
*/
fsl_comp->vdesc.tx_result.result =
DMA_TRANS_ABORTED;
dev_err(fsl_qdma->dma_dev.dev,
"DMA status descriptor error %x\n",
completion_status);
}
}
spin_lock(&fsl_comp->qchan->vchan.lock);
vchan_cookie_complete(&fsl_comp->vdesc);
fsl_comp->qchan->status = DMA_COMPLETE;
spin_unlock(&fsl_comp->qchan->vchan.lock);
}
return 0;
}
static irqreturn_t fsl_qdma_error_handler(int irq, void *dev_id)
{
unsigned int intr;
struct fsl_qdma_engine *fsl_qdma = dev_id;
void __iomem *status = fsl_qdma->status_base;
unsigned int decfdw0r;
unsigned int decfdw1r;
unsigned int decfdw2r;
unsigned int decfdw3r;
intr = qdma_readl(fsl_qdma, status + FSL_QDMA_DEDR);
if (intr) {
decfdw0r = qdma_readl(fsl_qdma, status + FSL_QDMA_DECFDW0R);
decfdw1r = qdma_readl(fsl_qdma, status + FSL_QDMA_DECFDW1R);
decfdw2r = qdma_readl(fsl_qdma, status + FSL_QDMA_DECFDW2R);
decfdw3r = qdma_readl(fsl_qdma, status + FSL_QDMA_DECFDW3R);
dev_err(fsl_qdma->dma_dev.dev,
"DMA transaction error! (%x: %x-%x-%x-%x)\n",
intr, decfdw0r, decfdw1r, decfdw2r, decfdw3r);
}
qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status + FSL_QDMA_DEDR);
return IRQ_HANDLED;
}
static irqreturn_t fsl_qdma_queue_handler(int irq, void *dev_id)
{
int id;
unsigned int intr, reg;
struct fsl_qdma_engine *fsl_qdma = dev_id;
void __iomem *block, *ctrl = fsl_qdma->ctrl_base;
id = irq - fsl_qdma->irq_base;
if (id < 0 && id > fsl_qdma->block_number) {
dev_err(fsl_qdma->dma_dev.dev,
"irq %d is wrong irq_base is %d\n",
irq, fsl_qdma->irq_base);
}
block = fsl_qdma->block_base +
FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, id);
intr = qdma_readl(fsl_qdma, block + FSL_QDMA_BCQIDR(0));
if ((intr & FSL_QDMA_CQIDR_SQT) != 0)
intr = fsl_qdma_queue_transfer_complete(fsl_qdma, block, id);
if (intr != 0) {
reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
reg |= FSL_QDMA_DMR_DQD;
qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BCQIER(0));
dev_err(fsl_qdma->dma_dev.dev, "QDMA: status err!\n");
}
/* Clear all detected events and interrupts. */
qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
block + FSL_QDMA_BCQIDR(0));
return IRQ_HANDLED;
}
static int
fsl_qdma_irq_init(struct platform_device *pdev,
struct fsl_qdma_engine *fsl_qdma)
{
int i;
int cpu;
int ret;
char irq_name[20];
fsl_qdma->error_irq =
platform_get_irq_byname(pdev, "qdma-error");
if (fsl_qdma->error_irq < 0)
return fsl_qdma->error_irq;
ret = devm_request_irq(&pdev->dev, fsl_qdma->error_irq,
fsl_qdma_error_handler, 0,
"qDMA error", fsl_qdma);
if (ret) {
dev_err(&pdev->dev, "Can't register qDMA controller IRQ.\n");
return ret;
}
for (i = 0; i < fsl_qdma->block_number; i++) {
sprintf(irq_name, "qdma-queue%d", i);
fsl_qdma->queue_irq[i] =
platform_get_irq_byname(pdev, irq_name);
if (fsl_qdma->queue_irq[i] < 0)
return fsl_qdma->queue_irq[i];
ret = devm_request_irq(&pdev->dev,
fsl_qdma->queue_irq[i],
fsl_qdma_queue_handler,
0,
"qDMA queue",
fsl_qdma);
if (ret) {
dev_err(&pdev->dev,
"Can't register qDMA queue IRQ.\n");
return ret;
}
cpu = i % num_online_cpus();
ret = irq_set_affinity_hint(fsl_qdma->queue_irq[i],
get_cpu_mask(cpu));
if (ret) {
dev_err(&pdev->dev,
"Can't set cpu %d affinity to IRQ %d.\n",
cpu,
fsl_qdma->queue_irq[i]);
return ret;
}
}
return 0;
}
static void fsl_qdma_irq_exit(struct platform_device *pdev,
struct fsl_qdma_engine *fsl_qdma)
{
int i;
devm_free_irq(&pdev->dev, fsl_qdma->error_irq, fsl_qdma);
for (i = 0; i < fsl_qdma->block_number; i++)
devm_free_irq(&pdev->dev, fsl_qdma->queue_irq[i], fsl_qdma);
}
static int fsl_qdma_reg_init(struct fsl_qdma_engine *fsl_qdma)
{
u32 reg;
int i, j, ret;
struct fsl_qdma_queue *temp;
void __iomem *status = fsl_qdma->status_base;
void __iomem *block, *ctrl = fsl_qdma->ctrl_base;
struct fsl_qdma_queue *fsl_queue = fsl_qdma->queue;
/* Try to halt the qDMA engine first. */
ret = fsl_qdma_halt(fsl_qdma);
if (ret) {
dev_err(fsl_qdma->dma_dev.dev, "DMA halt failed!");
return ret;
}
for (i = 0; i < fsl_qdma->block_number; i++) {
/*
* Clear the command queue interrupt detect register for
* all queues.
*/
block = fsl_qdma->block_base +
FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, i);
qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
block + FSL_QDMA_BCQIDR(0));
}
for (j = 0; j < fsl_qdma->block_number; j++) {
block = fsl_qdma->block_base +
FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
for (i = 0; i < fsl_qdma->n_queues; i++) {
temp = fsl_queue + i + (j * fsl_qdma->n_queues);
/*
* Initialize Command Queue registers to
* point to the first
* command descriptor in memory.
* Dequeue Pointer Address Registers
* Enqueue Pointer Address Registers
*/
qdma_writel(fsl_qdma, temp->bus_addr,
block + FSL_QDMA_BCQDPA_SADDR(i));
qdma_writel(fsl_qdma, temp->bus_addr,
block + FSL_QDMA_BCQEPA_SADDR(i));
/* Initialize the queue mode. */
reg = FSL_QDMA_BCQMR_EN;
reg |= FSL_QDMA_BCQMR_CD_THLD(ilog2(temp->n_cq) - 4);
reg |= FSL_QDMA_BCQMR_CQ_SIZE(ilog2(temp->n_cq) - 6);
qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BCQMR(i));
}
/*
* Workaround for erratum: ERR010812.
* We must enable XOFF to avoid the enqueue rejection occurs.
* Setting SQCCMR ENTER_WM to 0x20.
*/
qdma_writel(fsl_qdma, FSL_QDMA_SQCCMR_ENTER_WM,
block + FSL_QDMA_SQCCMR);
/*
* Initialize status queue registers to point to the first
* command descriptor in memory.
* Dequeue Pointer Address Registers
* Enqueue Pointer Address Registers
*/
qdma_writel(fsl_qdma, fsl_qdma->status[j]->bus_addr,
block + FSL_QDMA_SQEPAR);
qdma_writel(fsl_qdma, fsl_qdma->status[j]->bus_addr,
block + FSL_QDMA_SQDPAR);
/* Initialize status queue interrupt. */
qdma_writel(fsl_qdma, FSL_QDMA_BCQIER_CQTIE,
block + FSL_QDMA_BCQIER(0));
qdma_writel(fsl_qdma, FSL_QDMA_BSQICR_ICEN |
FSL_QDMA_BSQICR_ICST(5) | 0x8000,
block + FSL_QDMA_BSQICR);
qdma_writel(fsl_qdma, FSL_QDMA_CQIER_MEIE |
FSL_QDMA_CQIER_TEIE,
block + FSL_QDMA_CQIER);
/* Initialize the status queue mode. */
reg = FSL_QDMA_BSQMR_EN;
reg |= FSL_QDMA_BSQMR_CQ_SIZE(ilog2
(fsl_qdma->status[j]->n_cq) - 6);
qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQMR);
}
/* Initialize controller interrupt register. */
qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status + FSL_QDMA_DEDR);
qdma_writel(fsl_qdma, FSL_QDMA_DEIER_CLEAR, status + FSL_QDMA_DEIER);
reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
reg &= ~FSL_QDMA_DMR_DQD;
qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
return 0;
}
static struct dma_async_tx_descriptor *
fsl_qdma_prep_memcpy(struct dma_chan *chan, dma_addr_t dst,
dma_addr_t src, size_t len, unsigned long flags)
{
struct fsl_qdma_comp *fsl_comp;
struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
fsl_comp = fsl_qdma_request_enqueue_desc(fsl_chan);
if (!fsl_comp)
return NULL;
fsl_qdma_comp_fill_memcpy(fsl_comp, dst, src, len);
return vchan_tx_prep(&fsl_chan->vchan, &fsl_comp->vdesc, flags);
}
static void fsl_qdma_enqueue_desc(struct fsl_qdma_chan *fsl_chan)
{
u32 reg;
struct virt_dma_desc *vdesc;
struct fsl_qdma_comp *fsl_comp;
struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
void __iomem *block = fsl_queue->block_base;
reg = qdma_readl(fsl_chan->qdma, block + FSL_QDMA_BCQSR(fsl_queue->id));
if (reg & (FSL_QDMA_BCQSR_QF | FSL_QDMA_BCQSR_XOFF))
return;
vdesc = vchan_next_desc(&fsl_chan->vchan);
if (!vdesc)
return;
list_del(&vdesc->node);
fsl_comp = to_fsl_qdma_comp(vdesc);
memcpy(fsl_queue->virt_head++,
fsl_comp->virt_addr, sizeof(struct fsl_qdma_format));
if (fsl_queue->virt_head == fsl_queue->cq + fsl_queue->n_cq)
fsl_queue->virt_head = fsl_queue->cq;
list_add_tail(&fsl_comp->list, &fsl_queue->comp_used);
barrier();
reg = qdma_readl(fsl_chan->qdma, block + FSL_QDMA_BCQMR(fsl_queue->id));
reg |= FSL_QDMA_BCQMR_EI;
qdma_writel(fsl_chan->qdma, reg, block + FSL_QDMA_BCQMR(fsl_queue->id));
fsl_chan->status = DMA_IN_PROGRESS;
}
static void fsl_qdma_free_desc(struct virt_dma_desc *vdesc)
{
unsigned long flags;
struct fsl_qdma_comp *fsl_comp;
struct fsl_qdma_queue *fsl_queue;
fsl_comp = to_fsl_qdma_comp(vdesc);
fsl_queue = fsl_comp->qchan->queue;
spin_lock_irqsave(&fsl_queue->queue_lock, flags);
list_add_tail(&fsl_comp->list, &fsl_queue->comp_free);
spin_unlock_irqrestore(&fsl_queue->queue_lock, flags);
}
static void fsl_qdma_issue_pending(struct dma_chan *chan)
{
unsigned long flags;
struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
spin_lock_irqsave(&fsl_queue->queue_lock, flags);
spin_lock(&fsl_chan->vchan.lock);
if (vchan_issue_pending(&fsl_chan->vchan))
fsl_qdma_enqueue_desc(fsl_chan);
spin_unlock(&fsl_chan->vchan.lock);
spin_unlock_irqrestore(&fsl_queue->queue_lock, flags);
}
static void fsl_qdma_synchronize(struct dma_chan *chan)
{
struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
vchan_synchronize(&fsl_chan->vchan);
}
static int fsl_qdma_terminate_all(struct dma_chan *chan)
{
LIST_HEAD(head);
unsigned long flags;
struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
vchan_get_all_descriptors(&fsl_chan->vchan, &head);
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
return 0;
}
static int fsl_qdma_alloc_chan_resources(struct dma_chan *chan)
{
int ret;
struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
struct fsl_qdma_engine *fsl_qdma = fsl_chan->qdma;
struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
if (fsl_queue->comp_pool && fsl_queue->desc_pool)
return fsl_qdma->desc_allocated;
INIT_LIST_HEAD(&fsl_queue->comp_free);
/*
* The dma pool for queue command buffer
*/
fsl_queue->comp_pool =
dma_pool_create("comp_pool",
chan->device->dev,
FSL_QDMA_COMMAND_BUFFER_SIZE,
64, 0);
if (!fsl_queue->comp_pool)
return -ENOMEM;
/*
* The dma pool for Descriptor(SD/DD) buffer
*/
fsl_queue->desc_pool =
dma_pool_create("desc_pool",
chan->device->dev,
FSL_QDMA_DESCRIPTOR_BUFFER_SIZE,
32, 0);
if (!fsl_queue->desc_pool)
goto err_desc_pool;
ret = fsl_qdma_pre_request_enqueue_desc(fsl_queue);
if (ret) {
dev_err(chan->device->dev,
"failed to alloc dma buffer for S/G descriptor\n");
goto err_mem;
}
fsl_qdma->desc_allocated++;
return fsl_qdma->desc_allocated;
err_mem:
dma_pool_destroy(fsl_queue->desc_pool);
err_desc_pool:
dma_pool_destroy(fsl_queue->comp_pool);
return -ENOMEM;
}
static int fsl_qdma_probe(struct platform_device *pdev)
{
int ret, i;
int blk_num, blk_off;
u32 len, chans, queues;
struct fsl_qdma_chan *fsl_chan;
struct fsl_qdma_engine *fsl_qdma;
struct device_node *np = pdev->dev.of_node;
ret = of_property_read_u32(np, "dma-channels", &chans);
if (ret) {
dev_err(&pdev->dev, "Can't get dma-channels.\n");
return ret;
}
ret = of_property_read_u32(np, "block-offset", &blk_off);
if (ret) {
dev_err(&pdev->dev, "Can't get block-offset.\n");
return ret;
}
ret = of_property_read_u32(np, "block-number", &blk_num);
if (ret) {
dev_err(&pdev->dev, "Can't get block-number.\n");
return ret;
}
blk_num = min_t(int, blk_num, num_online_cpus());
len = sizeof(*fsl_qdma);
fsl_qdma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
if (!fsl_qdma)
return -ENOMEM;
len = sizeof(*fsl_chan) * chans;
fsl_qdma->chans = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
if (!fsl_qdma->chans)
return -ENOMEM;
len = sizeof(struct fsl_qdma_queue *) * blk_num;
fsl_qdma->status = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
if (!fsl_qdma->status)
return -ENOMEM;
len = sizeof(int) * blk_num;
fsl_qdma->queue_irq = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
if (!fsl_qdma->queue_irq)
return -ENOMEM;
ret = of_property_read_u32(np, "fsl,dma-queues", &queues);
if (ret) {
dev_err(&pdev->dev, "Can't get queues.\n");
return ret;
}
fsl_qdma->desc_allocated = 0;
fsl_qdma->n_chans = chans;
fsl_qdma->n_queues = queues;
fsl_qdma->block_number = blk_num;
fsl_qdma->block_offset = blk_off;
mutex_init(&fsl_qdma->fsl_qdma_mutex);
for (i = 0; i < fsl_qdma->block_number; i++) {
fsl_qdma->status[i] = fsl_qdma_prep_status_queue(pdev);
if (!fsl_qdma->status[i])
return -ENOMEM;
}
fsl_qdma->ctrl_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(fsl_qdma->ctrl_base))
return PTR_ERR(fsl_qdma->ctrl_base);
fsl_qdma->status_base = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(fsl_qdma->status_base))
return PTR_ERR(fsl_qdma->status_base);
fsl_qdma->block_base = devm_platform_ioremap_resource(pdev, 2);
if (IS_ERR(fsl_qdma->block_base))
return PTR_ERR(fsl_qdma->block_base);
fsl_qdma->queue = fsl_qdma_alloc_queue_resources(pdev, fsl_qdma);
if (!fsl_qdma->queue)
return -ENOMEM;
ret = fsl_qdma_irq_init(pdev, fsl_qdma);
if (ret)
return ret;
fsl_qdma->irq_base = platform_get_irq_byname(pdev, "qdma-queue0");
if (fsl_qdma->irq_base < 0)
return fsl_qdma->irq_base;
fsl_qdma->feature = of_property_read_bool(np, "big-endian");
INIT_LIST_HEAD(&fsl_qdma->dma_dev.channels);
for (i = 0; i < fsl_qdma->n_chans; i++) {
struct fsl_qdma_chan *fsl_chan = &fsl_qdma->chans[i];
fsl_chan->qdma = fsl_qdma;
fsl_chan->queue = fsl_qdma->queue + i % (fsl_qdma->n_queues *
fsl_qdma->block_number);
fsl_chan->vchan.desc_free = fsl_qdma_free_desc;
vchan_init(&fsl_chan->vchan, &fsl_qdma->dma_dev);
}
dma_cap_set(DMA_MEMCPY, fsl_qdma->dma_dev.cap_mask);
fsl_qdma->dma_dev.dev = &pdev->dev;
fsl_qdma->dma_dev.device_free_chan_resources =
fsl_qdma_free_chan_resources;
fsl_qdma->dma_dev.device_alloc_chan_resources =
fsl_qdma_alloc_chan_resources;
fsl_qdma->dma_dev.device_tx_status = dma_cookie_status;
fsl_qdma->dma_dev.device_prep_dma_memcpy = fsl_qdma_prep_memcpy;
fsl_qdma->dma_dev.device_issue_pending = fsl_qdma_issue_pending;
fsl_qdma->dma_dev.device_synchronize = fsl_qdma_synchronize;
fsl_qdma->dma_dev.device_terminate_all = fsl_qdma_terminate_all;
ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(40));
if (ret) {
dev_err(&pdev->dev, "dma_set_mask failure.\n");
return ret;
}
platform_set_drvdata(pdev, fsl_qdma);
ret = dma_async_device_register(&fsl_qdma->dma_dev);
if (ret) {
dev_err(&pdev->dev,
"Can't register NXP Layerscape qDMA engine.\n");
return ret;
}
ret = fsl_qdma_reg_init(fsl_qdma);
if (ret) {
dev_err(&pdev->dev, "Can't Initialize the qDMA engine.\n");
return ret;
}
return 0;
}
static void fsl_qdma_cleanup_vchan(struct dma_device *dmadev)
{
struct fsl_qdma_chan *chan, *_chan;
list_for_each_entry_safe(chan, _chan,
&dmadev->channels, vchan.chan.device_node) {
list_del(&chan->vchan.chan.device_node);
tasklet_kill(&chan->vchan.task);
}
}
static int fsl_qdma_remove(struct platform_device *pdev)
{
int i;
struct fsl_qdma_queue *status;
struct device_node *np = pdev->dev.of_node;
struct fsl_qdma_engine *fsl_qdma = platform_get_drvdata(pdev);
fsl_qdma_irq_exit(pdev, fsl_qdma);
fsl_qdma_cleanup_vchan(&fsl_qdma->dma_dev);
of_dma_controller_free(np);
dma_async_device_unregister(&fsl_qdma->dma_dev);
for (i = 0; i < fsl_qdma->block_number; i++) {
status = fsl_qdma->status[i];
dma_free_coherent(&pdev->dev, sizeof(struct fsl_qdma_format) *
status->n_cq, status->cq, status->bus_addr);
}
return 0;
}
static const struct of_device_id fsl_qdma_dt_ids[] = {
{ .compatible = "fsl,ls1021a-qdma", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, fsl_qdma_dt_ids);
static struct platform_driver fsl_qdma_driver = {
.driver = {
.name = "fsl-qdma",
.of_match_table = fsl_qdma_dt_ids,
},
.probe = fsl_qdma_probe,
.remove = fsl_qdma_remove,
};
module_platform_driver(fsl_qdma_driver);
MODULE_ALIAS("platform:fsl-qdma");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("NXP Layerscape qDMA engine driver");
| linux-master | drivers/dma/fsl-qdma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Copyright (C) 2010 Samsung Electronics Co. Ltd.
* Jaswinder Singh <[email protected]>
*/
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/amba/bus.h>
#include <linux/scatterlist.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/err.h>
#include <linux/pm_runtime.h>
#include <linux/bug.h>
#include <linux/reset.h>
#include "dmaengine.h"
#define PL330_MAX_CHAN 8
#define PL330_MAX_IRQS 32
#define PL330_MAX_PERI 32
#define PL330_MAX_BURST 16
#define PL330_QUIRK_BROKEN_NO_FLUSHP BIT(0)
#define PL330_QUIRK_PERIPH_BURST BIT(1)
enum pl330_cachectrl {
CCTRL0, /* Noncacheable and nonbufferable */
CCTRL1, /* Bufferable only */
CCTRL2, /* Cacheable, but do not allocate */
CCTRL3, /* Cacheable and bufferable, but do not allocate */
INVALID1, /* AWCACHE = 0x1000 */
INVALID2,
CCTRL6, /* Cacheable write-through, allocate on writes only */
CCTRL7, /* Cacheable write-back, allocate on writes only */
};
enum pl330_byteswap {
SWAP_NO,
SWAP_2,
SWAP_4,
SWAP_8,
SWAP_16,
};
/* Register and Bit field Definitions */
#define DS 0x0
#define DS_ST_STOP 0x0
#define DS_ST_EXEC 0x1
#define DS_ST_CMISS 0x2
#define DS_ST_UPDTPC 0x3
#define DS_ST_WFE 0x4
#define DS_ST_ATBRR 0x5
#define DS_ST_QBUSY 0x6
#define DS_ST_WFP 0x7
#define DS_ST_KILL 0x8
#define DS_ST_CMPLT 0x9
#define DS_ST_FLTCMP 0xe
#define DS_ST_FAULT 0xf
#define DPC 0x4
#define INTEN 0x20
#define ES 0x24
#define INTSTATUS 0x28
#define INTCLR 0x2c
#define FSM 0x30
#define FSC 0x34
#define FTM 0x38
#define _FTC 0x40
#define FTC(n) (_FTC + (n)*0x4)
#define _CS 0x100
#define CS(n) (_CS + (n)*0x8)
#define CS_CNS (1 << 21)
#define _CPC 0x104
#define CPC(n) (_CPC + (n)*0x8)
#define _SA 0x400
#define SA(n) (_SA + (n)*0x20)
#define _DA 0x404
#define DA(n) (_DA + (n)*0x20)
#define _CC 0x408
#define CC(n) (_CC + (n)*0x20)
#define CC_SRCINC (1 << 0)
#define CC_DSTINC (1 << 14)
#define CC_SRCPRI (1 << 8)
#define CC_DSTPRI (1 << 22)
#define CC_SRCNS (1 << 9)
#define CC_DSTNS (1 << 23)
#define CC_SRCIA (1 << 10)
#define CC_DSTIA (1 << 24)
#define CC_SRCBRSTLEN_SHFT 4
#define CC_DSTBRSTLEN_SHFT 18
#define CC_SRCBRSTSIZE_SHFT 1
#define CC_DSTBRSTSIZE_SHFT 15
#define CC_SRCCCTRL_SHFT 11
#define CC_SRCCCTRL_MASK 0x7
#define CC_DSTCCTRL_SHFT 25
#define CC_DRCCCTRL_MASK 0x7
#define CC_SWAP_SHFT 28
#define _LC0 0x40c
#define LC0(n) (_LC0 + (n)*0x20)
#define _LC1 0x410
#define LC1(n) (_LC1 + (n)*0x20)
#define DBGSTATUS 0xd00
#define DBG_BUSY (1 << 0)
#define DBGCMD 0xd04
#define DBGINST0 0xd08
#define DBGINST1 0xd0c
#define CR0 0xe00
#define CR1 0xe04
#define CR2 0xe08
#define CR3 0xe0c
#define CR4 0xe10
#define CRD 0xe14
#define PERIPH_ID 0xfe0
#define PERIPH_REV_SHIFT 20
#define PERIPH_REV_MASK 0xf
#define PERIPH_REV_R0P0 0
#define PERIPH_REV_R1P0 1
#define PERIPH_REV_R1P1 2
#define CR0_PERIPH_REQ_SET (1 << 0)
#define CR0_BOOT_EN_SET (1 << 1)
#define CR0_BOOT_MAN_NS (1 << 2)
#define CR0_NUM_CHANS_SHIFT 4
#define CR0_NUM_CHANS_MASK 0x7
#define CR0_NUM_PERIPH_SHIFT 12
#define CR0_NUM_PERIPH_MASK 0x1f
#define CR0_NUM_EVENTS_SHIFT 17
#define CR0_NUM_EVENTS_MASK 0x1f
#define CR1_ICACHE_LEN_SHIFT 0
#define CR1_ICACHE_LEN_MASK 0x7
#define CR1_NUM_ICACHELINES_SHIFT 4
#define CR1_NUM_ICACHELINES_MASK 0xf
#define CRD_DATA_WIDTH_SHIFT 0
#define CRD_DATA_WIDTH_MASK 0x7
#define CRD_WR_CAP_SHIFT 4
#define CRD_WR_CAP_MASK 0x7
#define CRD_WR_Q_DEP_SHIFT 8
#define CRD_WR_Q_DEP_MASK 0xf
#define CRD_RD_CAP_SHIFT 12
#define CRD_RD_CAP_MASK 0x7
#define CRD_RD_Q_DEP_SHIFT 16
#define CRD_RD_Q_DEP_MASK 0xf
#define CRD_DATA_BUFF_SHIFT 20
#define CRD_DATA_BUFF_MASK 0x3ff
#define PART 0x330
#define DESIGNER 0x41
#define REVISION 0x0
#define INTEG_CFG 0x0
#define PERIPH_ID_VAL ((PART << 0) | (DESIGNER << 12))
#define PL330_STATE_STOPPED (1 << 0)
#define PL330_STATE_EXECUTING (1 << 1)
#define PL330_STATE_WFE (1 << 2)
#define PL330_STATE_FAULTING (1 << 3)
#define PL330_STATE_COMPLETING (1 << 4)
#define PL330_STATE_WFP (1 << 5)
#define PL330_STATE_KILLING (1 << 6)
#define PL330_STATE_FAULT_COMPLETING (1 << 7)
#define PL330_STATE_CACHEMISS (1 << 8)
#define PL330_STATE_UPDTPC (1 << 9)
#define PL330_STATE_ATBARRIER (1 << 10)
#define PL330_STATE_QUEUEBUSY (1 << 11)
#define PL330_STATE_INVALID (1 << 15)
#define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \
| PL330_STATE_WFE | PL330_STATE_FAULTING)
#define CMD_DMAADDH 0x54
#define CMD_DMAEND 0x00
#define CMD_DMAFLUSHP 0x35
#define CMD_DMAGO 0xa0
#define CMD_DMALD 0x04
#define CMD_DMALDP 0x25
#define CMD_DMALP 0x20
#define CMD_DMALPEND 0x28
#define CMD_DMAKILL 0x01
#define CMD_DMAMOV 0xbc
#define CMD_DMANOP 0x18
#define CMD_DMARMB 0x12
#define CMD_DMASEV 0x34
#define CMD_DMAST 0x08
#define CMD_DMASTP 0x29
#define CMD_DMASTZ 0x0c
#define CMD_DMAWFE 0x36
#define CMD_DMAWFP 0x30
#define CMD_DMAWMB 0x13
#define SZ_DMAADDH 3
#define SZ_DMAEND 1
#define SZ_DMAFLUSHP 2
#define SZ_DMALD 1
#define SZ_DMALDP 2
#define SZ_DMALP 2
#define SZ_DMALPEND 2
#define SZ_DMAKILL 1
#define SZ_DMAMOV 6
#define SZ_DMANOP 1
#define SZ_DMARMB 1
#define SZ_DMASEV 2
#define SZ_DMAST 1
#define SZ_DMASTP 2
#define SZ_DMASTZ 1
#define SZ_DMAWFE 2
#define SZ_DMAWFP 2
#define SZ_DMAWMB 1
#define SZ_DMAGO 6
#define BRST_LEN(ccr) ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1)
#define BRST_SIZE(ccr) (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7))
#define BYTE_TO_BURST(b, ccr) ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr))
#define BURST_TO_BYTE(c, ccr) ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr))
/*
* With 256 bytes, we can do more than 2.5MB and 5MB xfers per req
* at 1byte/burst for P<->M and M<->M respectively.
* For typical scenario, at 1word/burst, 10MB and 20MB xfers per req
* should be enough for P<->M and M<->M respectively.
*/
#define MCODE_BUFF_PER_REQ 256
/* Use this _only_ to wait on transient states */
#define UNTIL(t, s) while (!(_state(t) & (s))) cpu_relax();
#ifdef PL330_DEBUG_MCGEN
static unsigned cmd_line;
#define PL330_DBGCMD_DUMP(off, x...) do { \
printk("%x:", cmd_line); \
printk(KERN_CONT x); \
cmd_line += off; \
} while (0)
#define PL330_DBGMC_START(addr) (cmd_line = addr)
#else
#define PL330_DBGCMD_DUMP(off, x...) do {} while (0)
#define PL330_DBGMC_START(addr) do {} while (0)
#endif
/* The number of default descriptors */
#define NR_DEFAULT_DESC 16
/* Delay for runtime PM autosuspend, ms */
#define PL330_AUTOSUSPEND_DELAY 20
/* Populated by the PL330 core driver for DMA API driver's info */
struct pl330_config {
u32 periph_id;
#define DMAC_MODE_NS (1 << 0)
unsigned int mode;
unsigned int data_bus_width:10; /* In number of bits */
unsigned int data_buf_dep:11;
unsigned int num_chan:4;
unsigned int num_peri:6;
u32 peri_ns;
unsigned int num_events:6;
u32 irq_ns;
};
/*
* Request Configuration.
* The PL330 core does not modify this and uses the last
* working configuration if the request doesn't provide any.
*
* The Client may want to provide this info only for the
* first request and a request with new settings.
*/
struct pl330_reqcfg {
/* Address Incrementing */
unsigned dst_inc:1;
unsigned src_inc:1;
/*
* For now, the SRC & DST protection levels
* and burst size/length are assumed same.
*/
bool nonsecure;
bool privileged;
bool insnaccess;
unsigned brst_len:5;
unsigned brst_size:3; /* in power of 2 */
enum pl330_cachectrl dcctl;
enum pl330_cachectrl scctl;
enum pl330_byteswap swap;
struct pl330_config *pcfg;
};
/*
* One cycle of DMAC operation.
* There may be more than one xfer in a request.
*/
struct pl330_xfer {
u32 src_addr;
u32 dst_addr;
/* Size to xfer */
u32 bytes;
};
/* The xfer callbacks are made with one of these arguments. */
enum pl330_op_err {
/* The all xfers in the request were success. */
PL330_ERR_NONE,
/* If req aborted due to global error. */
PL330_ERR_ABORT,
/* If req failed due to problem with Channel. */
PL330_ERR_FAIL,
};
enum dmamov_dst {
SAR = 0,
CCR,
DAR,
};
enum pl330_dst {
SRC = 0,
DST,
};
enum pl330_cond {
SINGLE,
BURST,
ALWAYS,
};
struct dma_pl330_desc;
struct _pl330_req {
u32 mc_bus;
void *mc_cpu;
struct dma_pl330_desc *desc;
};
/* ToBeDone for tasklet */
struct _pl330_tbd {
bool reset_dmac;
bool reset_mngr;
u8 reset_chan;
};
/* A DMAC Thread */
struct pl330_thread {
u8 id;
int ev;
/* If the channel is not yet acquired by any client */
bool free;
/* Parent DMAC */
struct pl330_dmac *dmac;
/* Only two at a time */
struct _pl330_req req[2];
/* Index of the last enqueued request */
unsigned lstenq;
/* Index of the last submitted request or -1 if the DMA is stopped */
int req_running;
};
enum pl330_dmac_state {
UNINIT,
INIT,
DYING,
};
enum desc_status {
/* In the DMAC pool */
FREE,
/*
* Allocated to some channel during prep_xxx
* Also may be sitting on the work_list.
*/
PREP,
/*
* Sitting on the work_list and already submitted
* to the PL330 core. Not more than two descriptors
* of a channel can be BUSY at any time.
*/
BUSY,
/*
* Pause was called while descriptor was BUSY. Due to hardware
* limitations, only termination is possible for descriptors
* that have been paused.
*/
PAUSED,
/*
* Sitting on the channel work_list but xfer done
* by PL330 core
*/
DONE,
};
struct dma_pl330_chan {
/* Schedule desc completion */
struct tasklet_struct task;
/* DMA-Engine Channel */
struct dma_chan chan;
/* List of submitted descriptors */
struct list_head submitted_list;
/* List of issued descriptors */
struct list_head work_list;
/* List of completed descriptors */
struct list_head completed_list;
/* Pointer to the DMAC that manages this channel,
* NULL if the channel is available to be acquired.
* As the parent, this DMAC also provides descriptors
* to the channel.
*/
struct pl330_dmac *dmac;
/* To protect channel manipulation */
spinlock_t lock;
/*
* Hardware channel thread of PL330 DMAC. NULL if the channel is
* available.
*/
struct pl330_thread *thread;
/* For D-to-M and M-to-D channels */
int burst_sz; /* the peripheral fifo width */
int burst_len; /* the number of burst */
phys_addr_t fifo_addr;
/* DMA-mapped view of the FIFO; may differ if an IOMMU is present */
dma_addr_t fifo_dma;
enum dma_data_direction dir;
struct dma_slave_config slave_config;
/* for cyclic capability */
bool cyclic;
/* for runtime pm tracking */
bool active;
};
struct pl330_dmac {
/* DMA-Engine Device */
struct dma_device ddma;
/* Pool of descriptors available for the DMAC's channels */
struct list_head desc_pool;
/* To protect desc_pool manipulation */
spinlock_t pool_lock;
/* Size of MicroCode buffers for each channel. */
unsigned mcbufsz;
/* ioremap'ed address of PL330 registers. */
void __iomem *base;
/* Populated by the PL330 core driver during pl330_add */
struct pl330_config pcfg;
spinlock_t lock;
/* Maximum possible events/irqs */
int events[32];
/* BUS address of MicroCode buffer */
dma_addr_t mcode_bus;
/* CPU address of MicroCode buffer */
void *mcode_cpu;
/* List of all Channel threads */
struct pl330_thread *channels;
/* Pointer to the MANAGER thread */
struct pl330_thread *manager;
/* To handle bad news in interrupt */
struct tasklet_struct tasks;
struct _pl330_tbd dmac_tbd;
/* State of DMAC operation */
enum pl330_dmac_state state;
/* Holds list of reqs with due callbacks */
struct list_head req_done;
/* Peripheral channels connected to this DMAC */
unsigned int num_peripherals;
struct dma_pl330_chan *peripherals; /* keep at end */
int quirks;
struct reset_control *rstc;
struct reset_control *rstc_ocp;
};
static struct pl330_of_quirks {
char *quirk;
int id;
} of_quirks[] = {
{
.quirk = "arm,pl330-broken-no-flushp",
.id = PL330_QUIRK_BROKEN_NO_FLUSHP,
},
{
.quirk = "arm,pl330-periph-burst",
.id = PL330_QUIRK_PERIPH_BURST,
}
};
struct dma_pl330_desc {
/* To attach to a queue as child */
struct list_head node;
/* Descriptor for the DMA Engine API */
struct dma_async_tx_descriptor txd;
/* Xfer for PL330 core */
struct pl330_xfer px;
struct pl330_reqcfg rqcfg;
enum desc_status status;
int bytes_requested;
bool last;
/* The channel which currently holds this desc */
struct dma_pl330_chan *pchan;
enum dma_transfer_direction rqtype;
/* Index of peripheral for the xfer. */
unsigned peri:5;
/* Hook to attach to DMAC's list of reqs with due callback */
struct list_head rqd;
};
struct _xfer_spec {
u32 ccr;
struct dma_pl330_desc *desc;
};
static int pl330_config_write(struct dma_chan *chan,
struct dma_slave_config *slave_config,
enum dma_transfer_direction direction);
static inline bool _queue_full(struct pl330_thread *thrd)
{
return thrd->req[0].desc != NULL && thrd->req[1].desc != NULL;
}
static inline bool is_manager(struct pl330_thread *thrd)
{
return thrd->dmac->manager == thrd;
}
/* If manager of the thread is in Non-Secure mode */
static inline bool _manager_ns(struct pl330_thread *thrd)
{
return (thrd->dmac->pcfg.mode & DMAC_MODE_NS) ? true : false;
}
static inline u32 get_revision(u32 periph_id)
{
return (periph_id >> PERIPH_REV_SHIFT) & PERIPH_REV_MASK;
}
static inline u32 _emit_END(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMAEND;
buf[0] = CMD_DMAEND;
PL330_DBGCMD_DUMP(SZ_DMAEND, "\tDMAEND\n");
return SZ_DMAEND;
}
static inline u32 _emit_FLUSHP(unsigned dry_run, u8 buf[], u8 peri)
{
if (dry_run)
return SZ_DMAFLUSHP;
buf[0] = CMD_DMAFLUSHP;
peri &= 0x1f;
peri <<= 3;
buf[1] = peri;
PL330_DBGCMD_DUMP(SZ_DMAFLUSHP, "\tDMAFLUSHP %u\n", peri >> 3);
return SZ_DMAFLUSHP;
}
static inline u32 _emit_LD(unsigned dry_run, u8 buf[], enum pl330_cond cond)
{
if (dry_run)
return SZ_DMALD;
buf[0] = CMD_DMALD;
if (cond == SINGLE)
buf[0] |= (0 << 1) | (1 << 0);
else if (cond == BURST)
buf[0] |= (1 << 1) | (1 << 0);
PL330_DBGCMD_DUMP(SZ_DMALD, "\tDMALD%c\n",
cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
return SZ_DMALD;
}
static inline u32 _emit_LDP(unsigned dry_run, u8 buf[],
enum pl330_cond cond, u8 peri)
{
if (dry_run)
return SZ_DMALDP;
buf[0] = CMD_DMALDP;
if (cond == BURST)
buf[0] |= (1 << 1);
peri &= 0x1f;
peri <<= 3;
buf[1] = peri;
PL330_DBGCMD_DUMP(SZ_DMALDP, "\tDMALDP%c %u\n",
cond == SINGLE ? 'S' : 'B', peri >> 3);
return SZ_DMALDP;
}
static inline u32 _emit_LP(unsigned dry_run, u8 buf[],
unsigned loop, u8 cnt)
{
if (dry_run)
return SZ_DMALP;
buf[0] = CMD_DMALP;
if (loop)
buf[0] |= (1 << 1);
cnt--; /* DMAC increments by 1 internally */
buf[1] = cnt;
PL330_DBGCMD_DUMP(SZ_DMALP, "\tDMALP_%c %u\n", loop ? '1' : '0', cnt);
return SZ_DMALP;
}
struct _arg_LPEND {
enum pl330_cond cond;
bool forever;
unsigned loop;
u8 bjump;
};
static inline u32 _emit_LPEND(unsigned dry_run, u8 buf[],
const struct _arg_LPEND *arg)
{
enum pl330_cond cond = arg->cond;
bool forever = arg->forever;
unsigned loop = arg->loop;
u8 bjump = arg->bjump;
if (dry_run)
return SZ_DMALPEND;
buf[0] = CMD_DMALPEND;
if (loop)
buf[0] |= (1 << 2);
if (!forever)
buf[0] |= (1 << 4);
if (cond == SINGLE)
buf[0] |= (0 << 1) | (1 << 0);
else if (cond == BURST)
buf[0] |= (1 << 1) | (1 << 0);
buf[1] = bjump;
PL330_DBGCMD_DUMP(SZ_DMALPEND, "\tDMALP%s%c_%c bjmpto_%x\n",
forever ? "FE" : "END",
cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'),
loop ? '1' : '0',
bjump);
return SZ_DMALPEND;
}
static inline u32 _emit_KILL(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMAKILL;
buf[0] = CMD_DMAKILL;
return SZ_DMAKILL;
}
static inline u32 _emit_MOV(unsigned dry_run, u8 buf[],
enum dmamov_dst dst, u32 val)
{
if (dry_run)
return SZ_DMAMOV;
buf[0] = CMD_DMAMOV;
buf[1] = dst;
buf[2] = val;
buf[3] = val >> 8;
buf[4] = val >> 16;
buf[5] = val >> 24;
PL330_DBGCMD_DUMP(SZ_DMAMOV, "\tDMAMOV %s 0x%x\n",
dst == SAR ? "SAR" : (dst == DAR ? "DAR" : "CCR"), val);
return SZ_DMAMOV;
}
static inline u32 _emit_RMB(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMARMB;
buf[0] = CMD_DMARMB;
PL330_DBGCMD_DUMP(SZ_DMARMB, "\tDMARMB\n");
return SZ_DMARMB;
}
static inline u32 _emit_SEV(unsigned dry_run, u8 buf[], u8 ev)
{
if (dry_run)
return SZ_DMASEV;
buf[0] = CMD_DMASEV;
ev &= 0x1f;
ev <<= 3;
buf[1] = ev;
PL330_DBGCMD_DUMP(SZ_DMASEV, "\tDMASEV %u\n", ev >> 3);
return SZ_DMASEV;
}
static inline u32 _emit_ST(unsigned dry_run, u8 buf[], enum pl330_cond cond)
{
if (dry_run)
return SZ_DMAST;
buf[0] = CMD_DMAST;
if (cond == SINGLE)
buf[0] |= (0 << 1) | (1 << 0);
else if (cond == BURST)
buf[0] |= (1 << 1) | (1 << 0);
PL330_DBGCMD_DUMP(SZ_DMAST, "\tDMAST%c\n",
cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'));
return SZ_DMAST;
}
static inline u32 _emit_STP(unsigned dry_run, u8 buf[],
enum pl330_cond cond, u8 peri)
{
if (dry_run)
return SZ_DMASTP;
buf[0] = CMD_DMASTP;
if (cond == BURST)
buf[0] |= (1 << 1);
peri &= 0x1f;
peri <<= 3;
buf[1] = peri;
PL330_DBGCMD_DUMP(SZ_DMASTP, "\tDMASTP%c %u\n",
cond == SINGLE ? 'S' : 'B', peri >> 3);
return SZ_DMASTP;
}
static inline u32 _emit_WFP(unsigned dry_run, u8 buf[],
enum pl330_cond cond, u8 peri)
{
if (dry_run)
return SZ_DMAWFP;
buf[0] = CMD_DMAWFP;
if (cond == SINGLE)
buf[0] |= (0 << 1) | (0 << 0);
else if (cond == BURST)
buf[0] |= (1 << 1) | (0 << 0);
else
buf[0] |= (0 << 1) | (1 << 0);
peri &= 0x1f;
peri <<= 3;
buf[1] = peri;
PL330_DBGCMD_DUMP(SZ_DMAWFP, "\tDMAWFP%c %u\n",
cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'P'), peri >> 3);
return SZ_DMAWFP;
}
static inline u32 _emit_WMB(unsigned dry_run, u8 buf[])
{
if (dry_run)
return SZ_DMAWMB;
buf[0] = CMD_DMAWMB;
PL330_DBGCMD_DUMP(SZ_DMAWMB, "\tDMAWMB\n");
return SZ_DMAWMB;
}
struct _arg_GO {
u8 chan;
u32 addr;
unsigned ns;
};
static inline u32 _emit_GO(unsigned dry_run, u8 buf[],
const struct _arg_GO *arg)
{
u8 chan = arg->chan;
u32 addr = arg->addr;
unsigned ns = arg->ns;
if (dry_run)
return SZ_DMAGO;
buf[0] = CMD_DMAGO;
buf[0] |= (ns << 1);
buf[1] = chan & 0x7;
buf[2] = addr;
buf[3] = addr >> 8;
buf[4] = addr >> 16;
buf[5] = addr >> 24;
return SZ_DMAGO;
}
#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
/* Returns Time-Out */
static bool _until_dmac_idle(struct pl330_thread *thrd)
{
void __iomem *regs = thrd->dmac->base;
unsigned long loops = msecs_to_loops(5);
do {
/* Until Manager is Idle */
if (!(readl(regs + DBGSTATUS) & DBG_BUSY))
break;
cpu_relax();
} while (--loops);
if (!loops)
return true;
return false;
}
static inline void _execute_DBGINSN(struct pl330_thread *thrd,
u8 insn[], bool as_manager)
{
void __iomem *regs = thrd->dmac->base;
u32 val;
/* If timed out due to halted state-machine */
if (_until_dmac_idle(thrd)) {
dev_err(thrd->dmac->ddma.dev, "DMAC halted!\n");
return;
}
val = (insn[0] << 16) | (insn[1] << 24);
if (!as_manager) {
val |= (1 << 0);
val |= (thrd->id << 8); /* Channel Number */
}
writel(val, regs + DBGINST0);
val = le32_to_cpu(*((__le32 *)&insn[2]));
writel(val, regs + DBGINST1);
/* Get going */
writel(0, regs + DBGCMD);
}
static inline u32 _state(struct pl330_thread *thrd)
{
void __iomem *regs = thrd->dmac->base;
u32 val;
if (is_manager(thrd))
val = readl(regs + DS) & 0xf;
else
val = readl(regs + CS(thrd->id)) & 0xf;
switch (val) {
case DS_ST_STOP:
return PL330_STATE_STOPPED;
case DS_ST_EXEC:
return PL330_STATE_EXECUTING;
case DS_ST_CMISS:
return PL330_STATE_CACHEMISS;
case DS_ST_UPDTPC:
return PL330_STATE_UPDTPC;
case DS_ST_WFE:
return PL330_STATE_WFE;
case DS_ST_FAULT:
return PL330_STATE_FAULTING;
case DS_ST_ATBRR:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_ATBARRIER;
case DS_ST_QBUSY:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_QUEUEBUSY;
case DS_ST_WFP:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_WFP;
case DS_ST_KILL:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_KILLING;
case DS_ST_CMPLT:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_COMPLETING;
case DS_ST_FLTCMP:
if (is_manager(thrd))
return PL330_STATE_INVALID;
else
return PL330_STATE_FAULT_COMPLETING;
default:
return PL330_STATE_INVALID;
}
}
static void _stop(struct pl330_thread *thrd)
{
void __iomem *regs = thrd->dmac->base;
u8 insn[6] = {0, 0, 0, 0, 0, 0};
u32 inten = readl(regs + INTEN);
if (_state(thrd) == PL330_STATE_FAULT_COMPLETING)
UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
/* Return if nothing needs to be done */
if (_state(thrd) == PL330_STATE_COMPLETING
|| _state(thrd) == PL330_STATE_KILLING
|| _state(thrd) == PL330_STATE_STOPPED)
return;
_emit_KILL(0, insn);
_execute_DBGINSN(thrd, insn, is_manager(thrd));
/* clear the event */
if (inten & (1 << thrd->ev))
writel(1 << thrd->ev, regs + INTCLR);
/* Stop generating interrupts for SEV */
writel(inten & ~(1 << thrd->ev), regs + INTEN);
}
/* Start doing req 'idx' of thread 'thrd' */
static bool _trigger(struct pl330_thread *thrd)
{
void __iomem *regs = thrd->dmac->base;
struct _pl330_req *req;
struct dma_pl330_desc *desc;
struct _arg_GO go;
unsigned ns;
u8 insn[6] = {0, 0, 0, 0, 0, 0};
int idx;
/* Return if already ACTIVE */
if (_state(thrd) != PL330_STATE_STOPPED)
return true;
idx = 1 - thrd->lstenq;
if (thrd->req[idx].desc != NULL) {
req = &thrd->req[idx];
} else {
idx = thrd->lstenq;
if (thrd->req[idx].desc != NULL)
req = &thrd->req[idx];
else
req = NULL;
}
/* Return if no request */
if (!req)
return true;
/* Return if req is running */
if (idx == thrd->req_running)
return true;
desc = req->desc;
ns = desc->rqcfg.nonsecure ? 1 : 0;
/* See 'Abort Sources' point-4 at Page 2-25 */
if (_manager_ns(thrd) && !ns)
dev_info(thrd->dmac->ddma.dev, "%s:%d Recipe for ABORT!\n",
__func__, __LINE__);
go.chan = thrd->id;
go.addr = req->mc_bus;
go.ns = ns;
_emit_GO(0, insn, &go);
/* Set to generate interrupts for SEV */
writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN);
/* Only manager can execute GO */
_execute_DBGINSN(thrd, insn, true);
thrd->req_running = idx;
return true;
}
static bool pl330_start_thread(struct pl330_thread *thrd)
{
switch (_state(thrd)) {
case PL330_STATE_FAULT_COMPLETING:
UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING);
if (_state(thrd) == PL330_STATE_KILLING)
UNTIL(thrd, PL330_STATE_STOPPED)
fallthrough;
case PL330_STATE_FAULTING:
_stop(thrd);
fallthrough;
case PL330_STATE_KILLING:
case PL330_STATE_COMPLETING:
UNTIL(thrd, PL330_STATE_STOPPED)
fallthrough;
case PL330_STATE_STOPPED:
return _trigger(thrd);
case PL330_STATE_WFP:
case PL330_STATE_QUEUEBUSY:
case PL330_STATE_ATBARRIER:
case PL330_STATE_UPDTPC:
case PL330_STATE_CACHEMISS:
case PL330_STATE_EXECUTING:
return true;
case PL330_STATE_WFE: /* For RESUME, nothing yet */
default:
return false;
}
}
static inline int _ldst_memtomem(unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs, int cyc)
{
int off = 0;
struct pl330_config *pcfg = pxs->desc->rqcfg.pcfg;
/* check lock-up free version */
if (get_revision(pcfg->periph_id) >= PERIPH_REV_R1P0) {
while (cyc--) {
off += _emit_LD(dry_run, &buf[off], ALWAYS);
off += _emit_ST(dry_run, &buf[off], ALWAYS);
}
} else {
while (cyc--) {
off += _emit_LD(dry_run, &buf[off], ALWAYS);
off += _emit_RMB(dry_run, &buf[off]);
off += _emit_ST(dry_run, &buf[off], ALWAYS);
off += _emit_WMB(dry_run, &buf[off]);
}
}
return off;
}
static u32 _emit_load(unsigned int dry_run, u8 buf[],
enum pl330_cond cond, enum dma_transfer_direction direction,
u8 peri)
{
int off = 0;
switch (direction) {
case DMA_MEM_TO_MEM:
case DMA_MEM_TO_DEV:
off += _emit_LD(dry_run, &buf[off], cond);
break;
case DMA_DEV_TO_MEM:
if (cond == ALWAYS) {
off += _emit_LDP(dry_run, &buf[off], SINGLE,
peri);
off += _emit_LDP(dry_run, &buf[off], BURST,
peri);
} else {
off += _emit_LDP(dry_run, &buf[off], cond,
peri);
}
break;
default:
/* this code should be unreachable */
WARN_ON(1);
break;
}
return off;
}
static inline u32 _emit_store(unsigned int dry_run, u8 buf[],
enum pl330_cond cond, enum dma_transfer_direction direction,
u8 peri)
{
int off = 0;
switch (direction) {
case DMA_MEM_TO_MEM:
case DMA_DEV_TO_MEM:
off += _emit_ST(dry_run, &buf[off], cond);
break;
case DMA_MEM_TO_DEV:
if (cond == ALWAYS) {
off += _emit_STP(dry_run, &buf[off], SINGLE,
peri);
off += _emit_STP(dry_run, &buf[off], BURST,
peri);
} else {
off += _emit_STP(dry_run, &buf[off], cond,
peri);
}
break;
default:
/* this code should be unreachable */
WARN_ON(1);
break;
}
return off;
}
static inline int _ldst_peripheral(struct pl330_dmac *pl330,
unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs, int cyc,
enum pl330_cond cond)
{
int off = 0;
/*
* do FLUSHP at beginning to clear any stale dma requests before the
* first WFP.
*/
if (!(pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP))
off += _emit_FLUSHP(dry_run, &buf[off], pxs->desc->peri);
while (cyc--) {
off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
off += _emit_load(dry_run, &buf[off], cond, pxs->desc->rqtype,
pxs->desc->peri);
off += _emit_store(dry_run, &buf[off], cond, pxs->desc->rqtype,
pxs->desc->peri);
}
return off;
}
static int _bursts(struct pl330_dmac *pl330, unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs, int cyc)
{
int off = 0;
enum pl330_cond cond = BRST_LEN(pxs->ccr) > 1 ? BURST : SINGLE;
if (pl330->quirks & PL330_QUIRK_PERIPH_BURST)
cond = BURST;
switch (pxs->desc->rqtype) {
case DMA_MEM_TO_DEV:
case DMA_DEV_TO_MEM:
off += _ldst_peripheral(pl330, dry_run, &buf[off], pxs, cyc,
cond);
break;
case DMA_MEM_TO_MEM:
off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc);
break;
default:
/* this code should be unreachable */
WARN_ON(1);
break;
}
return off;
}
/*
* only the unaligned burst transfers have the dregs.
* so, still transfer dregs with a reduced size burst
* for mem-to-mem, mem-to-dev or dev-to-mem.
*/
static int _dregs(struct pl330_dmac *pl330, unsigned int dry_run, u8 buf[],
const struct _xfer_spec *pxs, int transfer_length)
{
int off = 0;
int dregs_ccr;
if (transfer_length == 0)
return off;
/*
* dregs_len = (total bytes - BURST_TO_BYTE(bursts, ccr)) /
* BRST_SIZE(ccr)
* the dregs len must be smaller than burst len,
* so, for higher efficiency, we can modify CCR
* to use a reduced size burst len for the dregs.
*/
dregs_ccr = pxs->ccr;
dregs_ccr &= ~((0xf << CC_SRCBRSTLEN_SHFT) |
(0xf << CC_DSTBRSTLEN_SHFT));
dregs_ccr |= (((transfer_length - 1) & 0xf) <<
CC_SRCBRSTLEN_SHFT);
dregs_ccr |= (((transfer_length - 1) & 0xf) <<
CC_DSTBRSTLEN_SHFT);
switch (pxs->desc->rqtype) {
case DMA_MEM_TO_DEV:
case DMA_DEV_TO_MEM:
off += _emit_MOV(dry_run, &buf[off], CCR, dregs_ccr);
off += _ldst_peripheral(pl330, dry_run, &buf[off], pxs, 1,
BURST);
break;
case DMA_MEM_TO_MEM:
off += _emit_MOV(dry_run, &buf[off], CCR, dregs_ccr);
off += _ldst_memtomem(dry_run, &buf[off], pxs, 1);
break;
default:
/* this code should be unreachable */
WARN_ON(1);
break;
}
return off;
}
/* Returns bytes consumed and updates bursts */
static inline int _loop(struct pl330_dmac *pl330, unsigned dry_run, u8 buf[],
unsigned long *bursts, const struct _xfer_spec *pxs)
{
int cyc, cycmax, szlp, szlpend, szbrst, off;
unsigned lcnt0, lcnt1, ljmp0, ljmp1;
struct _arg_LPEND lpend;
if (*bursts == 1)
return _bursts(pl330, dry_run, buf, pxs, 1);
/* Max iterations possible in DMALP is 256 */
if (*bursts >= 256*256) {
lcnt1 = 256;
lcnt0 = 256;
cyc = *bursts / lcnt1 / lcnt0;
} else if (*bursts > 256) {
lcnt1 = 256;
lcnt0 = *bursts / lcnt1;
cyc = 1;
} else {
lcnt1 = *bursts;
lcnt0 = 0;
cyc = 1;
}
szlp = _emit_LP(1, buf, 0, 0);
szbrst = _bursts(pl330, 1, buf, pxs, 1);
lpend.cond = ALWAYS;
lpend.forever = false;
lpend.loop = 0;
lpend.bjump = 0;
szlpend = _emit_LPEND(1, buf, &lpend);
if (lcnt0) {
szlp *= 2;
szlpend *= 2;
}
/*
* Max bursts that we can unroll due to limit on the
* size of backward jump that can be encoded in DMALPEND
* which is 8-bits and hence 255
*/
cycmax = (255 - (szlp + szlpend)) / szbrst;
cyc = (cycmax < cyc) ? cycmax : cyc;
off = 0;
if (lcnt0) {
off += _emit_LP(dry_run, &buf[off], 0, lcnt0);
ljmp0 = off;
}
off += _emit_LP(dry_run, &buf[off], 1, lcnt1);
ljmp1 = off;
off += _bursts(pl330, dry_run, &buf[off], pxs, cyc);
lpend.cond = ALWAYS;
lpend.forever = false;
lpend.loop = 1;
lpend.bjump = off - ljmp1;
off += _emit_LPEND(dry_run, &buf[off], &lpend);
if (lcnt0) {
lpend.cond = ALWAYS;
lpend.forever = false;
lpend.loop = 0;
lpend.bjump = off - ljmp0;
off += _emit_LPEND(dry_run, &buf[off], &lpend);
}
*bursts = lcnt1 * cyc;
if (lcnt0)
*bursts *= lcnt0;
return off;
}
static inline int _setup_loops(struct pl330_dmac *pl330,
unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs)
{
struct pl330_xfer *x = &pxs->desc->px;
u32 ccr = pxs->ccr;
unsigned long c, bursts = BYTE_TO_BURST(x->bytes, ccr);
int num_dregs = (x->bytes - BURST_TO_BYTE(bursts, ccr)) /
BRST_SIZE(ccr);
int off = 0;
while (bursts) {
c = bursts;
off += _loop(pl330, dry_run, &buf[off], &c, pxs);
bursts -= c;
}
off += _dregs(pl330, dry_run, &buf[off], pxs, num_dregs);
return off;
}
static inline int _setup_xfer(struct pl330_dmac *pl330,
unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs)
{
struct pl330_xfer *x = &pxs->desc->px;
int off = 0;
/* DMAMOV SAR, x->src_addr */
off += _emit_MOV(dry_run, &buf[off], SAR, x->src_addr);
/* DMAMOV DAR, x->dst_addr */
off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr);
/* Setup Loop(s) */
off += _setup_loops(pl330, dry_run, &buf[off], pxs);
return off;
}
/*
* A req is a sequence of one or more xfer units.
* Returns the number of bytes taken to setup the MC for the req.
*/
static int _setup_req(struct pl330_dmac *pl330, unsigned dry_run,
struct pl330_thread *thrd, unsigned index,
struct _xfer_spec *pxs)
{
struct _pl330_req *req = &thrd->req[index];
u8 *buf = req->mc_cpu;
int off = 0;
PL330_DBGMC_START(req->mc_bus);
/* DMAMOV CCR, ccr */
off += _emit_MOV(dry_run, &buf[off], CCR, pxs->ccr);
off += _setup_xfer(pl330, dry_run, &buf[off], pxs);
/* DMASEV peripheral/event */
off += _emit_SEV(dry_run, &buf[off], thrd->ev);
/* DMAEND */
off += _emit_END(dry_run, &buf[off]);
return off;
}
static inline u32 _prepare_ccr(const struct pl330_reqcfg *rqc)
{
u32 ccr = 0;
if (rqc->src_inc)
ccr |= CC_SRCINC;
if (rqc->dst_inc)
ccr |= CC_DSTINC;
/* We set same protection levels for Src and DST for now */
if (rqc->privileged)
ccr |= CC_SRCPRI | CC_DSTPRI;
if (rqc->nonsecure)
ccr |= CC_SRCNS | CC_DSTNS;
if (rqc->insnaccess)
ccr |= CC_SRCIA | CC_DSTIA;
ccr |= (((rqc->brst_len - 1) & 0xf) << CC_SRCBRSTLEN_SHFT);
ccr |= (((rqc->brst_len - 1) & 0xf) << CC_DSTBRSTLEN_SHFT);
ccr |= (rqc->brst_size << CC_SRCBRSTSIZE_SHFT);
ccr |= (rqc->brst_size << CC_DSTBRSTSIZE_SHFT);
ccr |= (rqc->scctl << CC_SRCCCTRL_SHFT);
ccr |= (rqc->dcctl << CC_DSTCCTRL_SHFT);
ccr |= (rqc->swap << CC_SWAP_SHFT);
return ccr;
}
/*
* Submit a list of xfers after which the client wants notification.
* Client is not notified after each xfer unit, just once after all
* xfer units are done or some error occurs.
*/
static int pl330_submit_req(struct pl330_thread *thrd,
struct dma_pl330_desc *desc)
{
struct pl330_dmac *pl330 = thrd->dmac;
struct _xfer_spec xs;
unsigned long flags;
unsigned idx;
u32 ccr;
int ret = 0;
switch (desc->rqtype) {
case DMA_MEM_TO_DEV:
break;
case DMA_DEV_TO_MEM:
break;
case DMA_MEM_TO_MEM:
break;
default:
return -ENOTSUPP;
}
if (pl330->state == DYING
|| pl330->dmac_tbd.reset_chan & (1 << thrd->id)) {
dev_info(thrd->dmac->ddma.dev, "%s:%d\n",
__func__, __LINE__);
return -EAGAIN;
}
/* If request for non-existing peripheral */
if (desc->rqtype != DMA_MEM_TO_MEM &&
desc->peri >= pl330->pcfg.num_peri) {
dev_info(thrd->dmac->ddma.dev,
"%s:%d Invalid peripheral(%u)!\n",
__func__, __LINE__, desc->peri);
return -EINVAL;
}
spin_lock_irqsave(&pl330->lock, flags);
if (_queue_full(thrd)) {
ret = -EAGAIN;
goto xfer_exit;
}
/* Prefer Secure Channel */
if (!_manager_ns(thrd))
desc->rqcfg.nonsecure = 0;
else
desc->rqcfg.nonsecure = 1;
ccr = _prepare_ccr(&desc->rqcfg);
idx = thrd->req[0].desc == NULL ? 0 : 1;
xs.ccr = ccr;
xs.desc = desc;
/* First dry run to check if req is acceptable */
ret = _setup_req(pl330, 1, thrd, idx, &xs);
if (ret > pl330->mcbufsz / 2) {
dev_info(pl330->ddma.dev, "%s:%d Try increasing mcbufsz (%i/%i)\n",
__func__, __LINE__, ret, pl330->mcbufsz / 2);
ret = -ENOMEM;
goto xfer_exit;
}
/* Hook the request */
thrd->lstenq = idx;
thrd->req[idx].desc = desc;
_setup_req(pl330, 0, thrd, idx, &xs);
ret = 0;
xfer_exit:
spin_unlock_irqrestore(&pl330->lock, flags);
return ret;
}
static void dma_pl330_rqcb(struct dma_pl330_desc *desc, enum pl330_op_err err)
{
struct dma_pl330_chan *pch;
unsigned long flags;
if (!desc)
return;
pch = desc->pchan;
/* If desc aborted */
if (!pch)
return;
spin_lock_irqsave(&pch->lock, flags);
desc->status = DONE;
spin_unlock_irqrestore(&pch->lock, flags);
tasklet_schedule(&pch->task);
}
static void pl330_dotask(struct tasklet_struct *t)
{
struct pl330_dmac *pl330 = from_tasklet(pl330, t, tasks);
unsigned long flags;
int i;
spin_lock_irqsave(&pl330->lock, flags);
/* The DMAC itself gone nuts */
if (pl330->dmac_tbd.reset_dmac) {
pl330->state = DYING;
/* Reset the manager too */
pl330->dmac_tbd.reset_mngr = true;
/* Clear the reset flag */
pl330->dmac_tbd.reset_dmac = false;
}
if (pl330->dmac_tbd.reset_mngr) {
_stop(pl330->manager);
/* Reset all channels */
pl330->dmac_tbd.reset_chan = (1 << pl330->pcfg.num_chan) - 1;
/* Clear the reset flag */
pl330->dmac_tbd.reset_mngr = false;
}
for (i = 0; i < pl330->pcfg.num_chan; i++) {
if (pl330->dmac_tbd.reset_chan & (1 << i)) {
struct pl330_thread *thrd = &pl330->channels[i];
void __iomem *regs = pl330->base;
enum pl330_op_err err;
_stop(thrd);
if (readl(regs + FSC) & (1 << thrd->id))
err = PL330_ERR_FAIL;
else
err = PL330_ERR_ABORT;
spin_unlock_irqrestore(&pl330->lock, flags);
dma_pl330_rqcb(thrd->req[1 - thrd->lstenq].desc, err);
dma_pl330_rqcb(thrd->req[thrd->lstenq].desc, err);
spin_lock_irqsave(&pl330->lock, flags);
thrd->req[0].desc = NULL;
thrd->req[1].desc = NULL;
thrd->req_running = -1;
/* Clear the reset flag */
pl330->dmac_tbd.reset_chan &= ~(1 << i);
}
}
spin_unlock_irqrestore(&pl330->lock, flags);
return;
}
/* Returns 1 if state was updated, 0 otherwise */
static int pl330_update(struct pl330_dmac *pl330)
{
struct dma_pl330_desc *descdone;
unsigned long flags;
void __iomem *regs;
u32 val;
int id, ev, ret = 0;
regs = pl330->base;
spin_lock_irqsave(&pl330->lock, flags);
val = readl(regs + FSM) & 0x1;
if (val)
pl330->dmac_tbd.reset_mngr = true;
else
pl330->dmac_tbd.reset_mngr = false;
val = readl(regs + FSC) & ((1 << pl330->pcfg.num_chan) - 1);
pl330->dmac_tbd.reset_chan |= val;
if (val) {
int i = 0;
while (i < pl330->pcfg.num_chan) {
if (val & (1 << i)) {
dev_info(pl330->ddma.dev,
"Reset Channel-%d\t CS-%x FTC-%x\n",
i, readl(regs + CS(i)),
readl(regs + FTC(i)));
_stop(&pl330->channels[i]);
}
i++;
}
}
/* Check which event happened i.e, thread notified */
val = readl(regs + ES);
if (pl330->pcfg.num_events < 32
&& val & ~((1 << pl330->pcfg.num_events) - 1)) {
pl330->dmac_tbd.reset_dmac = true;
dev_err(pl330->ddma.dev, "%s:%d Unexpected!\n", __func__,
__LINE__);
ret = 1;
goto updt_exit;
}
for (ev = 0; ev < pl330->pcfg.num_events; ev++) {
if (val & (1 << ev)) { /* Event occurred */
struct pl330_thread *thrd;
u32 inten = readl(regs + INTEN);
int active;
/* Clear the event */
if (inten & (1 << ev))
writel(1 << ev, regs + INTCLR);
ret = 1;
id = pl330->events[ev];
thrd = &pl330->channels[id];
active = thrd->req_running;
if (active == -1) /* Aborted */
continue;
/* Detach the req */
descdone = thrd->req[active].desc;
thrd->req[active].desc = NULL;
thrd->req_running = -1;
/* Get going again ASAP */
pl330_start_thread(thrd);
/* For now, just make a list of callbacks to be done */
list_add_tail(&descdone->rqd, &pl330->req_done);
}
}
/* Now that we are in no hurry, do the callbacks */
while (!list_empty(&pl330->req_done)) {
descdone = list_first_entry(&pl330->req_done,
struct dma_pl330_desc, rqd);
list_del(&descdone->rqd);
spin_unlock_irqrestore(&pl330->lock, flags);
dma_pl330_rqcb(descdone, PL330_ERR_NONE);
spin_lock_irqsave(&pl330->lock, flags);
}
updt_exit:
spin_unlock_irqrestore(&pl330->lock, flags);
if (pl330->dmac_tbd.reset_dmac
|| pl330->dmac_tbd.reset_mngr
|| pl330->dmac_tbd.reset_chan) {
ret = 1;
tasklet_schedule(&pl330->tasks);
}
return ret;
}
/* Reserve an event */
static inline int _alloc_event(struct pl330_thread *thrd)
{
struct pl330_dmac *pl330 = thrd->dmac;
int ev;
for (ev = 0; ev < pl330->pcfg.num_events; ev++)
if (pl330->events[ev] == -1) {
pl330->events[ev] = thrd->id;
return ev;
}
return -1;
}
static bool _chan_ns(const struct pl330_dmac *pl330, int i)
{
return pl330->pcfg.irq_ns & (1 << i);
}
/* Upon success, returns IdentityToken for the
* allocated channel, NULL otherwise.
*/
static struct pl330_thread *pl330_request_channel(struct pl330_dmac *pl330)
{
struct pl330_thread *thrd = NULL;
int chans, i;
if (pl330->state == DYING)
return NULL;
chans = pl330->pcfg.num_chan;
for (i = 0; i < chans; i++) {
thrd = &pl330->channels[i];
if ((thrd->free) && (!_manager_ns(thrd) ||
_chan_ns(pl330, i))) {
thrd->ev = _alloc_event(thrd);
if (thrd->ev >= 0) {
thrd->free = false;
thrd->lstenq = 1;
thrd->req[0].desc = NULL;
thrd->req[1].desc = NULL;
thrd->req_running = -1;
break;
}
}
thrd = NULL;
}
return thrd;
}
/* Release an event */
static inline void _free_event(struct pl330_thread *thrd, int ev)
{
struct pl330_dmac *pl330 = thrd->dmac;
/* If the event is valid and was held by the thread */
if (ev >= 0 && ev < pl330->pcfg.num_events
&& pl330->events[ev] == thrd->id)
pl330->events[ev] = -1;
}
static void pl330_release_channel(struct pl330_thread *thrd)
{
if (!thrd || thrd->free)
return;
_stop(thrd);
dma_pl330_rqcb(thrd->req[1 - thrd->lstenq].desc, PL330_ERR_ABORT);
dma_pl330_rqcb(thrd->req[thrd->lstenq].desc, PL330_ERR_ABORT);
_free_event(thrd, thrd->ev);
thrd->free = true;
}
/* Initialize the structure for PL330 configuration, that can be used
* by the client driver the make best use of the DMAC
*/
static void read_dmac_config(struct pl330_dmac *pl330)
{
void __iomem *regs = pl330->base;
u32 val;
val = readl(regs + CRD) >> CRD_DATA_WIDTH_SHIFT;
val &= CRD_DATA_WIDTH_MASK;
pl330->pcfg.data_bus_width = 8 * (1 << val);
val = readl(regs + CRD) >> CRD_DATA_BUFF_SHIFT;
val &= CRD_DATA_BUFF_MASK;
pl330->pcfg.data_buf_dep = val + 1;
val = readl(regs + CR0) >> CR0_NUM_CHANS_SHIFT;
val &= CR0_NUM_CHANS_MASK;
val += 1;
pl330->pcfg.num_chan = val;
val = readl(regs + CR0);
if (val & CR0_PERIPH_REQ_SET) {
val = (val >> CR0_NUM_PERIPH_SHIFT) & CR0_NUM_PERIPH_MASK;
val += 1;
pl330->pcfg.num_peri = val;
pl330->pcfg.peri_ns = readl(regs + CR4);
} else {
pl330->pcfg.num_peri = 0;
}
val = readl(regs + CR0);
if (val & CR0_BOOT_MAN_NS)
pl330->pcfg.mode |= DMAC_MODE_NS;
else
pl330->pcfg.mode &= ~DMAC_MODE_NS;
val = readl(regs + CR0) >> CR0_NUM_EVENTS_SHIFT;
val &= CR0_NUM_EVENTS_MASK;
val += 1;
pl330->pcfg.num_events = val;
pl330->pcfg.irq_ns = readl(regs + CR3);
}
static inline void _reset_thread(struct pl330_thread *thrd)
{
struct pl330_dmac *pl330 = thrd->dmac;
thrd->req[0].mc_cpu = pl330->mcode_cpu
+ (thrd->id * pl330->mcbufsz);
thrd->req[0].mc_bus = pl330->mcode_bus
+ (thrd->id * pl330->mcbufsz);
thrd->req[0].desc = NULL;
thrd->req[1].mc_cpu = thrd->req[0].mc_cpu
+ pl330->mcbufsz / 2;
thrd->req[1].mc_bus = thrd->req[0].mc_bus
+ pl330->mcbufsz / 2;
thrd->req[1].desc = NULL;
thrd->req_running = -1;
}
static int dmac_alloc_threads(struct pl330_dmac *pl330)
{
int chans = pl330->pcfg.num_chan;
struct pl330_thread *thrd;
int i;
/* Allocate 1 Manager and 'chans' Channel threads */
pl330->channels = kcalloc(1 + chans, sizeof(*thrd),
GFP_KERNEL);
if (!pl330->channels)
return -ENOMEM;
/* Init Channel threads */
for (i = 0; i < chans; i++) {
thrd = &pl330->channels[i];
thrd->id = i;
thrd->dmac = pl330;
_reset_thread(thrd);
thrd->free = true;
}
/* MANAGER is indexed at the end */
thrd = &pl330->channels[chans];
thrd->id = chans;
thrd->dmac = pl330;
thrd->free = false;
pl330->manager = thrd;
return 0;
}
static int dmac_alloc_resources(struct pl330_dmac *pl330)
{
int chans = pl330->pcfg.num_chan;
int ret;
/*
* Alloc MicroCode buffer for 'chans' Channel threads.
* A channel's buffer offset is (Channel_Id * MCODE_BUFF_PERCHAN)
*/
pl330->mcode_cpu = dma_alloc_attrs(pl330->ddma.dev,
chans * pl330->mcbufsz,
&pl330->mcode_bus, GFP_KERNEL,
DMA_ATTR_PRIVILEGED);
if (!pl330->mcode_cpu) {
dev_err(pl330->ddma.dev, "%s:%d Can't allocate memory!\n",
__func__, __LINE__);
return -ENOMEM;
}
ret = dmac_alloc_threads(pl330);
if (ret) {
dev_err(pl330->ddma.dev, "%s:%d Can't to create channels for DMAC!\n",
__func__, __LINE__);
dma_free_attrs(pl330->ddma.dev,
chans * pl330->mcbufsz,
pl330->mcode_cpu, pl330->mcode_bus,
DMA_ATTR_PRIVILEGED);
return ret;
}
return 0;
}
static int pl330_add(struct pl330_dmac *pl330)
{
int i, ret;
/* Check if we can handle this DMAC */
if ((pl330->pcfg.periph_id & 0xfffff) != PERIPH_ID_VAL) {
dev_err(pl330->ddma.dev, "PERIPH_ID 0x%x !\n",
pl330->pcfg.periph_id);
return -EINVAL;
}
/* Read the configuration of the DMAC */
read_dmac_config(pl330);
if (pl330->pcfg.num_events == 0) {
dev_err(pl330->ddma.dev, "%s:%d Can't work without events!\n",
__func__, __LINE__);
return -EINVAL;
}
spin_lock_init(&pl330->lock);
INIT_LIST_HEAD(&pl330->req_done);
/* Use default MC buffer size if not provided */
if (!pl330->mcbufsz)
pl330->mcbufsz = MCODE_BUFF_PER_REQ * 2;
/* Mark all events as free */
for (i = 0; i < pl330->pcfg.num_events; i++)
pl330->events[i] = -1;
/* Allocate resources needed by the DMAC */
ret = dmac_alloc_resources(pl330);
if (ret) {
dev_err(pl330->ddma.dev, "Unable to create channels for DMAC\n");
return ret;
}
tasklet_setup(&pl330->tasks, pl330_dotask);
pl330->state = INIT;
return 0;
}
static int dmac_free_threads(struct pl330_dmac *pl330)
{
struct pl330_thread *thrd;
int i;
/* Release Channel threads */
for (i = 0; i < pl330->pcfg.num_chan; i++) {
thrd = &pl330->channels[i];
pl330_release_channel(thrd);
}
/* Free memory */
kfree(pl330->channels);
return 0;
}
static void pl330_del(struct pl330_dmac *pl330)
{
pl330->state = UNINIT;
tasklet_kill(&pl330->tasks);
/* Free DMAC resources */
dmac_free_threads(pl330);
dma_free_attrs(pl330->ddma.dev,
pl330->pcfg.num_chan * pl330->mcbufsz, pl330->mcode_cpu,
pl330->mcode_bus, DMA_ATTR_PRIVILEGED);
}
/* forward declaration */
static struct amba_driver pl330_driver;
static inline struct dma_pl330_chan *
to_pchan(struct dma_chan *ch)
{
if (!ch)
return NULL;
return container_of(ch, struct dma_pl330_chan, chan);
}
static inline struct dma_pl330_desc *
to_desc(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct dma_pl330_desc, txd);
}
static inline void fill_queue(struct dma_pl330_chan *pch)
{
struct dma_pl330_desc *desc;
int ret;
list_for_each_entry(desc, &pch->work_list, node) {
/* If already submitted */
if (desc->status == BUSY || desc->status == PAUSED)
continue;
ret = pl330_submit_req(pch->thread, desc);
if (!ret) {
desc->status = BUSY;
} else if (ret == -EAGAIN) {
/* QFull or DMAC Dying */
break;
} else {
/* Unacceptable request */
desc->status = DONE;
dev_err(pch->dmac->ddma.dev, "%s:%d Bad Desc(%d)\n",
__func__, __LINE__, desc->txd.cookie);
tasklet_schedule(&pch->task);
}
}
}
static void pl330_tasklet(struct tasklet_struct *t)
{
struct dma_pl330_chan *pch = from_tasklet(pch, t, task);
struct dma_pl330_desc *desc, *_dt;
unsigned long flags;
bool power_down = false;
spin_lock_irqsave(&pch->lock, flags);
/* Pick up ripe tomatoes */
list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
if (desc->status == DONE) {
if (!pch->cyclic)
dma_cookie_complete(&desc->txd);
list_move_tail(&desc->node, &pch->completed_list);
}
/* Try to submit a req imm. next to the last completed cookie */
fill_queue(pch);
if (list_empty(&pch->work_list)) {
spin_lock(&pch->thread->dmac->lock);
_stop(pch->thread);
spin_unlock(&pch->thread->dmac->lock);
power_down = true;
pch->active = false;
} else {
/* Make sure the PL330 Channel thread is active */
spin_lock(&pch->thread->dmac->lock);
pl330_start_thread(pch->thread);
spin_unlock(&pch->thread->dmac->lock);
}
while (!list_empty(&pch->completed_list)) {
struct dmaengine_desc_callback cb;
desc = list_first_entry(&pch->completed_list,
struct dma_pl330_desc, node);
dmaengine_desc_get_callback(&desc->txd, &cb);
if (pch->cyclic) {
desc->status = PREP;
list_move_tail(&desc->node, &pch->work_list);
if (power_down) {
pch->active = true;
spin_lock(&pch->thread->dmac->lock);
pl330_start_thread(pch->thread);
spin_unlock(&pch->thread->dmac->lock);
power_down = false;
}
} else {
desc->status = FREE;
list_move_tail(&desc->node, &pch->dmac->desc_pool);
}
dma_descriptor_unmap(&desc->txd);
if (dmaengine_desc_callback_valid(&cb)) {
spin_unlock_irqrestore(&pch->lock, flags);
dmaengine_desc_callback_invoke(&cb, NULL);
spin_lock_irqsave(&pch->lock, flags);
}
}
spin_unlock_irqrestore(&pch->lock, flags);
/* If work list empty, power down */
if (power_down) {
pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
pm_runtime_put_autosuspend(pch->dmac->ddma.dev);
}
}
static struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
int count = dma_spec->args_count;
struct pl330_dmac *pl330 = ofdma->of_dma_data;
unsigned int chan_id;
if (!pl330)
return NULL;
if (count != 1)
return NULL;
chan_id = dma_spec->args[0];
if (chan_id >= pl330->num_peripherals)
return NULL;
return dma_get_slave_channel(&pl330->peripherals[chan_id].chan);
}
static int pl330_alloc_chan_resources(struct dma_chan *chan)
{
struct dma_pl330_chan *pch = to_pchan(chan);
struct pl330_dmac *pl330 = pch->dmac;
unsigned long flags;
spin_lock_irqsave(&pl330->lock, flags);
dma_cookie_init(chan);
pch->cyclic = false;
pch->thread = pl330_request_channel(pl330);
if (!pch->thread) {
spin_unlock_irqrestore(&pl330->lock, flags);
return -ENOMEM;
}
tasklet_setup(&pch->task, pl330_tasklet);
spin_unlock_irqrestore(&pl330->lock, flags);
return 1;
}
/*
* We need the data direction between the DMAC (the dma-mapping "device") and
* the FIFO (the dmaengine "dev"), from the FIFO's point of view. Confusing!
*/
static enum dma_data_direction
pl330_dma_slave_map_dir(enum dma_transfer_direction dir)
{
switch (dir) {
case DMA_MEM_TO_DEV:
return DMA_FROM_DEVICE;
case DMA_DEV_TO_MEM:
return DMA_TO_DEVICE;
case DMA_DEV_TO_DEV:
return DMA_BIDIRECTIONAL;
default:
return DMA_NONE;
}
}
static void pl330_unprep_slave_fifo(struct dma_pl330_chan *pch)
{
if (pch->dir != DMA_NONE)
dma_unmap_resource(pch->chan.device->dev, pch->fifo_dma,
1 << pch->burst_sz, pch->dir, 0);
pch->dir = DMA_NONE;
}
static bool pl330_prep_slave_fifo(struct dma_pl330_chan *pch,
enum dma_transfer_direction dir)
{
struct device *dev = pch->chan.device->dev;
enum dma_data_direction dma_dir = pl330_dma_slave_map_dir(dir);
/* Already mapped for this config? */
if (pch->dir == dma_dir)
return true;
pl330_unprep_slave_fifo(pch);
pch->fifo_dma = dma_map_resource(dev, pch->fifo_addr,
1 << pch->burst_sz, dma_dir, 0);
if (dma_mapping_error(dev, pch->fifo_dma))
return false;
pch->dir = dma_dir;
return true;
}
static int fixup_burst_len(int max_burst_len, int quirks)
{
if (max_burst_len > PL330_MAX_BURST)
return PL330_MAX_BURST;
else if (max_burst_len < 1)
return 1;
else
return max_burst_len;
}
static int pl330_config_write(struct dma_chan *chan,
struct dma_slave_config *slave_config,
enum dma_transfer_direction direction)
{
struct dma_pl330_chan *pch = to_pchan(chan);
pl330_unprep_slave_fifo(pch);
if (direction == DMA_MEM_TO_DEV) {
if (slave_config->dst_addr)
pch->fifo_addr = slave_config->dst_addr;
if (slave_config->dst_addr_width)
pch->burst_sz = __ffs(slave_config->dst_addr_width);
pch->burst_len = fixup_burst_len(slave_config->dst_maxburst,
pch->dmac->quirks);
} else if (direction == DMA_DEV_TO_MEM) {
if (slave_config->src_addr)
pch->fifo_addr = slave_config->src_addr;
if (slave_config->src_addr_width)
pch->burst_sz = __ffs(slave_config->src_addr_width);
pch->burst_len = fixup_burst_len(slave_config->src_maxburst,
pch->dmac->quirks);
}
return 0;
}
static int pl330_config(struct dma_chan *chan,
struct dma_slave_config *slave_config)
{
struct dma_pl330_chan *pch = to_pchan(chan);
memcpy(&pch->slave_config, slave_config, sizeof(*slave_config));
return 0;
}
static int pl330_terminate_all(struct dma_chan *chan)
{
struct dma_pl330_chan *pch = to_pchan(chan);
struct dma_pl330_desc *desc;
unsigned long flags;
struct pl330_dmac *pl330 = pch->dmac;
bool power_down = false;
pm_runtime_get_sync(pl330->ddma.dev);
spin_lock_irqsave(&pch->lock, flags);
spin_lock(&pl330->lock);
_stop(pch->thread);
pch->thread->req[0].desc = NULL;
pch->thread->req[1].desc = NULL;
pch->thread->req_running = -1;
spin_unlock(&pl330->lock);
power_down = pch->active;
pch->active = false;
/* Mark all desc done */
list_for_each_entry(desc, &pch->submitted_list, node) {
desc->status = FREE;
dma_cookie_complete(&desc->txd);
}
list_for_each_entry(desc, &pch->work_list , node) {
desc->status = FREE;
dma_cookie_complete(&desc->txd);
}
list_splice_tail_init(&pch->submitted_list, &pl330->desc_pool);
list_splice_tail_init(&pch->work_list, &pl330->desc_pool);
list_splice_tail_init(&pch->completed_list, &pl330->desc_pool);
spin_unlock_irqrestore(&pch->lock, flags);
pm_runtime_mark_last_busy(pl330->ddma.dev);
if (power_down)
pm_runtime_put_autosuspend(pl330->ddma.dev);
pm_runtime_put_autosuspend(pl330->ddma.dev);
return 0;
}
/*
* We don't support DMA_RESUME command because of hardware
* limitations, so after pausing the channel we cannot restore
* it to active state. We have to terminate channel and setup
* DMA transfer again. This pause feature was implemented to
* allow safely read residue before channel termination.
*/
static int pl330_pause(struct dma_chan *chan)
{
struct dma_pl330_chan *pch = to_pchan(chan);
struct pl330_dmac *pl330 = pch->dmac;
struct dma_pl330_desc *desc;
unsigned long flags;
pm_runtime_get_sync(pl330->ddma.dev);
spin_lock_irqsave(&pch->lock, flags);
spin_lock(&pl330->lock);
_stop(pch->thread);
spin_unlock(&pl330->lock);
list_for_each_entry(desc, &pch->work_list, node) {
if (desc->status == BUSY)
desc->status = PAUSED;
}
spin_unlock_irqrestore(&pch->lock, flags);
pm_runtime_mark_last_busy(pl330->ddma.dev);
pm_runtime_put_autosuspend(pl330->ddma.dev);
return 0;
}
static void pl330_free_chan_resources(struct dma_chan *chan)
{
struct dma_pl330_chan *pch = to_pchan(chan);
struct pl330_dmac *pl330 = pch->dmac;
unsigned long flags;
tasklet_kill(&pch->task);
pm_runtime_get_sync(pch->dmac->ddma.dev);
spin_lock_irqsave(&pl330->lock, flags);
pl330_release_channel(pch->thread);
pch->thread = NULL;
if (pch->cyclic)
list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool);
spin_unlock_irqrestore(&pl330->lock, flags);
pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
pm_runtime_put_autosuspend(pch->dmac->ddma.dev);
pl330_unprep_slave_fifo(pch);
}
static int pl330_get_current_xferred_count(struct dma_pl330_chan *pch,
struct dma_pl330_desc *desc)
{
struct pl330_thread *thrd = pch->thread;
struct pl330_dmac *pl330 = pch->dmac;
void __iomem *regs = thrd->dmac->base;
u32 val, addr;
pm_runtime_get_sync(pl330->ddma.dev);
val = addr = 0;
if (desc->rqcfg.src_inc) {
val = readl(regs + SA(thrd->id));
addr = desc->px.src_addr;
} else {
val = readl(regs + DA(thrd->id));
addr = desc->px.dst_addr;
}
pm_runtime_mark_last_busy(pch->dmac->ddma.dev);
pm_runtime_put_autosuspend(pl330->ddma.dev);
/* If DMAMOV hasn't finished yet, SAR/DAR can be zero */
if (!val)
return 0;
return val - addr;
}
static enum dma_status
pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
enum dma_status ret;
unsigned long flags;
struct dma_pl330_desc *desc, *running = NULL, *last_enq = NULL;
struct dma_pl330_chan *pch = to_pchan(chan);
unsigned int transferred, residual = 0;
ret = dma_cookie_status(chan, cookie, txstate);
if (!txstate)
return ret;
if (ret == DMA_COMPLETE)
goto out;
spin_lock_irqsave(&pch->lock, flags);
spin_lock(&pch->thread->dmac->lock);
if (pch->thread->req_running != -1)
running = pch->thread->req[pch->thread->req_running].desc;
last_enq = pch->thread->req[pch->thread->lstenq].desc;
/* Check in pending list */
list_for_each_entry(desc, &pch->work_list, node) {
if (desc->status == DONE)
transferred = desc->bytes_requested;
else if (running && desc == running)
transferred =
pl330_get_current_xferred_count(pch, desc);
else if (desc->status == BUSY || desc->status == PAUSED)
/*
* Busy but not running means either just enqueued,
* or finished and not yet marked done
*/
if (desc == last_enq)
transferred = 0;
else
transferred = desc->bytes_requested;
else
transferred = 0;
residual += desc->bytes_requested - transferred;
if (desc->txd.cookie == cookie) {
switch (desc->status) {
case DONE:
ret = DMA_COMPLETE;
break;
case PAUSED:
ret = DMA_PAUSED;
break;
case PREP:
case BUSY:
ret = DMA_IN_PROGRESS;
break;
default:
WARN_ON(1);
}
break;
}
if (desc->last)
residual = 0;
}
spin_unlock(&pch->thread->dmac->lock);
spin_unlock_irqrestore(&pch->lock, flags);
out:
dma_set_residue(txstate, residual);
return ret;
}
static void pl330_issue_pending(struct dma_chan *chan)
{
struct dma_pl330_chan *pch = to_pchan(chan);
unsigned long flags;
spin_lock_irqsave(&pch->lock, flags);
if (list_empty(&pch->work_list)) {
/*
* Warn on nothing pending. Empty submitted_list may
* break our pm_runtime usage counter as it is
* updated on work_list emptiness status.
*/
WARN_ON(list_empty(&pch->submitted_list));
pch->active = true;
pm_runtime_get_sync(pch->dmac->ddma.dev);
}
list_splice_tail_init(&pch->submitted_list, &pch->work_list);
spin_unlock_irqrestore(&pch->lock, flags);
pl330_tasklet(&pch->task);
}
/*
* We returned the last one of the circular list of descriptor(s)
* from prep_xxx, so the argument to submit corresponds to the last
* descriptor of the list.
*/
static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct dma_pl330_desc *desc, *last = to_desc(tx);
struct dma_pl330_chan *pch = to_pchan(tx->chan);
dma_cookie_t cookie;
unsigned long flags;
spin_lock_irqsave(&pch->lock, flags);
/* Assign cookies to all nodes */
while (!list_empty(&last->node)) {
desc = list_entry(last->node.next, struct dma_pl330_desc, node);
if (pch->cyclic) {
desc->txd.callback = last->txd.callback;
desc->txd.callback_param = last->txd.callback_param;
}
desc->last = false;
dma_cookie_assign(&desc->txd);
list_move_tail(&desc->node, &pch->submitted_list);
}
last->last = true;
cookie = dma_cookie_assign(&last->txd);
list_add_tail(&last->node, &pch->submitted_list);
spin_unlock_irqrestore(&pch->lock, flags);
return cookie;
}
static inline void _init_desc(struct dma_pl330_desc *desc)
{
desc->rqcfg.swap = SWAP_NO;
desc->rqcfg.scctl = CCTRL0;
desc->rqcfg.dcctl = CCTRL0;
desc->txd.tx_submit = pl330_tx_submit;
INIT_LIST_HEAD(&desc->node);
}
/* Returns the number of descriptors added to the DMAC pool */
static int add_desc(struct list_head *pool, spinlock_t *lock,
gfp_t flg, int count)
{
struct dma_pl330_desc *desc;
unsigned long flags;
int i;
desc = kcalloc(count, sizeof(*desc), flg);
if (!desc)
return 0;
spin_lock_irqsave(lock, flags);
for (i = 0; i < count; i++) {
_init_desc(&desc[i]);
list_add_tail(&desc[i].node, pool);
}
spin_unlock_irqrestore(lock, flags);
return count;
}
static struct dma_pl330_desc *pluck_desc(struct list_head *pool,
spinlock_t *lock)
{
struct dma_pl330_desc *desc = NULL;
unsigned long flags;
spin_lock_irqsave(lock, flags);
if (!list_empty(pool)) {
desc = list_entry(pool->next,
struct dma_pl330_desc, node);
list_del_init(&desc->node);
desc->status = PREP;
desc->txd.callback = NULL;
}
spin_unlock_irqrestore(lock, flags);
return desc;
}
static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch)
{
struct pl330_dmac *pl330 = pch->dmac;
u8 *peri_id = pch->chan.private;
struct dma_pl330_desc *desc;
/* Pluck one desc from the pool of DMAC */
desc = pluck_desc(&pl330->desc_pool, &pl330->pool_lock);
/* If the DMAC pool is empty, alloc new */
if (!desc) {
static DEFINE_SPINLOCK(lock);
LIST_HEAD(pool);
if (!add_desc(&pool, &lock, GFP_ATOMIC, 1))
return NULL;
desc = pluck_desc(&pool, &lock);
WARN_ON(!desc || !list_empty(&pool));
}
/* Initialize the descriptor */
desc->pchan = pch;
desc->txd.cookie = 0;
async_tx_ack(&desc->txd);
desc->peri = peri_id ? pch->chan.chan_id : 0;
desc->rqcfg.pcfg = &pch->dmac->pcfg;
dma_async_tx_descriptor_init(&desc->txd, &pch->chan);
return desc;
}
static inline void fill_px(struct pl330_xfer *px,
dma_addr_t dst, dma_addr_t src, size_t len)
{
px->bytes = len;
px->dst_addr = dst;
px->src_addr = src;
}
static struct dma_pl330_desc *
__pl330_prep_dma_memcpy(struct dma_pl330_chan *pch, dma_addr_t dst,
dma_addr_t src, size_t len)
{
struct dma_pl330_desc *desc = pl330_get_desc(pch);
if (!desc) {
dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n",
__func__, __LINE__);
return NULL;
}
/*
* Ideally we should lookout for reqs bigger than
* those that can be programmed with 256 bytes of
* MC buffer, but considering a req size is seldom
* going to be word-unaligned and more than 200MB,
* we take it easy.
* Also, should the limit is reached we'd rather
* have the platform increase MC buffer size than
* complicating this API driver.
*/
fill_px(&desc->px, dst, src, len);
return desc;
}
/* Call after fixing burst size */
static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len)
{
struct dma_pl330_chan *pch = desc->pchan;
struct pl330_dmac *pl330 = pch->dmac;
int burst_len;
burst_len = pl330->pcfg.data_bus_width / 8;
burst_len *= pl330->pcfg.data_buf_dep / pl330->pcfg.num_chan;
burst_len >>= desc->rqcfg.brst_size;
/* src/dst_burst_len can't be more than 16 */
if (burst_len > PL330_MAX_BURST)
burst_len = PL330_MAX_BURST;
return burst_len;
}
static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t dma_addr, size_t len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct dma_pl330_desc *desc = NULL, *first = NULL;
struct dma_pl330_chan *pch = to_pchan(chan);
struct pl330_dmac *pl330 = pch->dmac;
unsigned int i;
dma_addr_t dst;
dma_addr_t src;
if (len % period_len != 0)
return NULL;
if (!is_slave_direction(direction)) {
dev_err(pch->dmac->ddma.dev, "%s:%d Invalid dma direction\n",
__func__, __LINE__);
return NULL;
}
pl330_config_write(chan, &pch->slave_config, direction);
if (!pl330_prep_slave_fifo(pch, direction))
return NULL;
for (i = 0; i < len / period_len; i++) {
desc = pl330_get_desc(pch);
if (!desc) {
unsigned long iflags;
dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n",
__func__, __LINE__);
if (!first)
return NULL;
spin_lock_irqsave(&pl330->pool_lock, iflags);
while (!list_empty(&first->node)) {
desc = list_entry(first->node.next,
struct dma_pl330_desc, node);
list_move_tail(&desc->node, &pl330->desc_pool);
}
list_move_tail(&first->node, &pl330->desc_pool);
spin_unlock_irqrestore(&pl330->pool_lock, iflags);
return NULL;
}
switch (direction) {
case DMA_MEM_TO_DEV:
desc->rqcfg.src_inc = 1;
desc->rqcfg.dst_inc = 0;
src = dma_addr;
dst = pch->fifo_dma;
break;
case DMA_DEV_TO_MEM:
desc->rqcfg.src_inc = 0;
desc->rqcfg.dst_inc = 1;
src = pch->fifo_dma;
dst = dma_addr;
break;
default:
break;
}
desc->rqtype = direction;
desc->rqcfg.brst_size = pch->burst_sz;
desc->rqcfg.brst_len = pch->burst_len;
desc->bytes_requested = period_len;
fill_px(&desc->px, dst, src, period_len);
if (!first)
first = desc;
else
list_add_tail(&desc->node, &first->node);
dma_addr += period_len;
}
if (!desc)
return NULL;
pch->cyclic = true;
return &desc->txd;
}
static struct dma_async_tx_descriptor *
pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
dma_addr_t src, size_t len, unsigned long flags)
{
struct dma_pl330_desc *desc;
struct dma_pl330_chan *pch = to_pchan(chan);
struct pl330_dmac *pl330;
int burst;
if (unlikely(!pch || !len))
return NULL;
pl330 = pch->dmac;
desc = __pl330_prep_dma_memcpy(pch, dst, src, len);
if (!desc)
return NULL;
desc->rqcfg.src_inc = 1;
desc->rqcfg.dst_inc = 1;
desc->rqtype = DMA_MEM_TO_MEM;
/* Select max possible burst size */
burst = pl330->pcfg.data_bus_width / 8;
/*
* Make sure we use a burst size that aligns with all the memcpy
* parameters because our DMA programming algorithm doesn't cope with
* transfers which straddle an entry in the DMA device's MFIFO.
*/
while ((src | dst | len) & (burst - 1))
burst /= 2;
desc->rqcfg.brst_size = 0;
while (burst != (1 << desc->rqcfg.brst_size))
desc->rqcfg.brst_size++;
desc->rqcfg.brst_len = get_burst_len(desc, len);
/*
* If burst size is smaller than bus width then make sure we only
* transfer one at a time to avoid a burst stradling an MFIFO entry.
*/
if (burst * 8 < pl330->pcfg.data_bus_width)
desc->rqcfg.brst_len = 1;
desc->bytes_requested = len;
return &desc->txd;
}
static void __pl330_giveback_desc(struct pl330_dmac *pl330,
struct dma_pl330_desc *first)
{
unsigned long flags;
struct dma_pl330_desc *desc;
if (!first)
return;
spin_lock_irqsave(&pl330->pool_lock, flags);
while (!list_empty(&first->node)) {
desc = list_entry(first->node.next,
struct dma_pl330_desc, node);
list_move_tail(&desc->node, &pl330->desc_pool);
}
list_move_tail(&first->node, &pl330->desc_pool);
spin_unlock_irqrestore(&pl330->pool_lock, flags);
}
static struct dma_async_tx_descriptor *
pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flg, void *context)
{
struct dma_pl330_desc *first, *desc = NULL;
struct dma_pl330_chan *pch = to_pchan(chan);
struct scatterlist *sg;
int i;
if (unlikely(!pch || !sgl || !sg_len))
return NULL;
pl330_config_write(chan, &pch->slave_config, direction);
if (!pl330_prep_slave_fifo(pch, direction))
return NULL;
first = NULL;
for_each_sg(sgl, sg, sg_len, i) {
desc = pl330_get_desc(pch);
if (!desc) {
struct pl330_dmac *pl330 = pch->dmac;
dev_err(pch->dmac->ddma.dev,
"%s:%d Unable to fetch desc\n",
__func__, __LINE__);
__pl330_giveback_desc(pl330, first);
return NULL;
}
if (!first)
first = desc;
else
list_add_tail(&desc->node, &first->node);
if (direction == DMA_MEM_TO_DEV) {
desc->rqcfg.src_inc = 1;
desc->rqcfg.dst_inc = 0;
fill_px(&desc->px, pch->fifo_dma, sg_dma_address(sg),
sg_dma_len(sg));
} else {
desc->rqcfg.src_inc = 0;
desc->rqcfg.dst_inc = 1;
fill_px(&desc->px, sg_dma_address(sg), pch->fifo_dma,
sg_dma_len(sg));
}
desc->rqcfg.brst_size = pch->burst_sz;
desc->rqcfg.brst_len = pch->burst_len;
desc->rqtype = direction;
desc->bytes_requested = sg_dma_len(sg);
}
/* Return the last desc in the chain */
return &desc->txd;
}
static irqreturn_t pl330_irq_handler(int irq, void *data)
{
if (pl330_update(data))
return IRQ_HANDLED;
else
return IRQ_NONE;
}
#define PL330_DMA_BUSWIDTHS \
BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)
#ifdef CONFIG_DEBUG_FS
static int pl330_debugfs_show(struct seq_file *s, void *data)
{
struct pl330_dmac *pl330 = s->private;
int chans, pchs, ch, pr;
chans = pl330->pcfg.num_chan;
pchs = pl330->num_peripherals;
seq_puts(s, "PL330 physical channels:\n");
seq_puts(s, "THREAD:\t\tCHANNEL:\n");
seq_puts(s, "--------\t-----\n");
for (ch = 0; ch < chans; ch++) {
struct pl330_thread *thrd = &pl330->channels[ch];
int found = -1;
for (pr = 0; pr < pchs; pr++) {
struct dma_pl330_chan *pch = &pl330->peripherals[pr];
if (!pch->thread || thrd->id != pch->thread->id)
continue;
found = pr;
}
seq_printf(s, "%d\t\t", thrd->id);
if (found == -1)
seq_puts(s, "--\n");
else
seq_printf(s, "%d\n", found);
}
return 0;
}
DEFINE_SHOW_ATTRIBUTE(pl330_debugfs);
static inline void init_pl330_debugfs(struct pl330_dmac *pl330)
{
debugfs_create_file(dev_name(pl330->ddma.dev),
S_IFREG | 0444, NULL, pl330,
&pl330_debugfs_fops);
}
#else
static inline void init_pl330_debugfs(struct pl330_dmac *pl330)
{
}
#endif
/*
* Runtime PM callbacks are provided by amba/bus.c driver.
*
* It is assumed here that IRQ safe runtime PM is chosen in probe and amba
* bus driver will only disable/enable the clock in runtime PM callbacks.
*/
static int __maybe_unused pl330_suspend(struct device *dev)
{
struct amba_device *pcdev = to_amba_device(dev);
pm_runtime_force_suspend(dev);
clk_unprepare(pcdev->pclk);
return 0;
}
static int __maybe_unused pl330_resume(struct device *dev)
{
struct amba_device *pcdev = to_amba_device(dev);
int ret;
ret = clk_prepare(pcdev->pclk);
if (ret)
return ret;
pm_runtime_force_resume(dev);
return ret;
}
static const struct dev_pm_ops pl330_pm = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(pl330_suspend, pl330_resume)
};
static int
pl330_probe(struct amba_device *adev, const struct amba_id *id)
{
struct pl330_config *pcfg;
struct pl330_dmac *pl330;
struct dma_pl330_chan *pch, *_p;
struct dma_device *pd;
struct resource *res;
int i, ret, irq;
int num_chan;
struct device_node *np = adev->dev.of_node;
ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
/* Allocate a new DMAC and its Channels */
pl330 = devm_kzalloc(&adev->dev, sizeof(*pl330), GFP_KERNEL);
if (!pl330)
return -ENOMEM;
pd = &pl330->ddma;
pd->dev = &adev->dev;
pl330->mcbufsz = 0;
/* get quirk */
for (i = 0; i < ARRAY_SIZE(of_quirks); i++)
if (of_property_read_bool(np, of_quirks[i].quirk))
pl330->quirks |= of_quirks[i].id;
res = &adev->res;
pl330->base = devm_ioremap_resource(&adev->dev, res);
if (IS_ERR(pl330->base))
return PTR_ERR(pl330->base);
amba_set_drvdata(adev, pl330);
pl330->rstc = devm_reset_control_get_optional(&adev->dev, "dma");
if (IS_ERR(pl330->rstc)) {
return dev_err_probe(&adev->dev, PTR_ERR(pl330->rstc), "Failed to get reset!\n");
} else {
ret = reset_control_deassert(pl330->rstc);
if (ret) {
dev_err(&adev->dev, "Couldn't deassert the device from reset!\n");
return ret;
}
}
pl330->rstc_ocp = devm_reset_control_get_optional(&adev->dev, "dma-ocp");
if (IS_ERR(pl330->rstc_ocp)) {
return dev_err_probe(&adev->dev, PTR_ERR(pl330->rstc_ocp),
"Failed to get OCP reset!\n");
} else {
ret = reset_control_deassert(pl330->rstc_ocp);
if (ret) {
dev_err(&adev->dev, "Couldn't deassert the device from OCP reset!\n");
return ret;
}
}
for (i = 0; i < AMBA_NR_IRQS; i++) {
irq = adev->irq[i];
if (irq) {
ret = devm_request_irq(&adev->dev, irq,
pl330_irq_handler, 0,
dev_name(&adev->dev), pl330);
if (ret)
return ret;
} else {
break;
}
}
pcfg = &pl330->pcfg;
pcfg->periph_id = adev->periphid;
ret = pl330_add(pl330);
if (ret)
return ret;
INIT_LIST_HEAD(&pl330->desc_pool);
spin_lock_init(&pl330->pool_lock);
/* Create a descriptor pool of default size */
if (!add_desc(&pl330->desc_pool, &pl330->pool_lock,
GFP_KERNEL, NR_DEFAULT_DESC))
dev_warn(&adev->dev, "unable to allocate desc\n");
INIT_LIST_HEAD(&pd->channels);
/* Initialize channel parameters */
num_chan = max_t(int, pcfg->num_peri, pcfg->num_chan);
pl330->num_peripherals = num_chan;
pl330->peripherals = kcalloc(num_chan, sizeof(*pch), GFP_KERNEL);
if (!pl330->peripherals) {
ret = -ENOMEM;
goto probe_err2;
}
for (i = 0; i < num_chan; i++) {
pch = &pl330->peripherals[i];
pch->chan.private = adev->dev.of_node;
INIT_LIST_HEAD(&pch->submitted_list);
INIT_LIST_HEAD(&pch->work_list);
INIT_LIST_HEAD(&pch->completed_list);
spin_lock_init(&pch->lock);
pch->thread = NULL;
pch->chan.device = pd;
pch->dmac = pl330;
pch->dir = DMA_NONE;
/* Add the channel to the DMAC list */
list_add_tail(&pch->chan.device_node, &pd->channels);
}
dma_cap_set(DMA_MEMCPY, pd->cap_mask);
if (pcfg->num_peri) {
dma_cap_set(DMA_SLAVE, pd->cap_mask);
dma_cap_set(DMA_CYCLIC, pd->cap_mask);
dma_cap_set(DMA_PRIVATE, pd->cap_mask);
}
pd->device_alloc_chan_resources = pl330_alloc_chan_resources;
pd->device_free_chan_resources = pl330_free_chan_resources;
pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy;
pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic;
pd->device_tx_status = pl330_tx_status;
pd->device_prep_slave_sg = pl330_prep_slave_sg;
pd->device_config = pl330_config;
pd->device_pause = pl330_pause;
pd->device_terminate_all = pl330_terminate_all;
pd->device_issue_pending = pl330_issue_pending;
pd->src_addr_widths = PL330_DMA_BUSWIDTHS;
pd->dst_addr_widths = PL330_DMA_BUSWIDTHS;
pd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
pd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
pd->max_burst = PL330_MAX_BURST;
ret = dma_async_device_register(pd);
if (ret) {
dev_err(&adev->dev, "unable to register DMAC\n");
goto probe_err3;
}
if (adev->dev.of_node) {
ret = of_dma_controller_register(adev->dev.of_node,
of_dma_pl330_xlate, pl330);
if (ret) {
dev_err(&adev->dev,
"unable to register DMA to the generic DT DMA helpers\n");
}
}
/*
* This is the limit for transfers with a buswidth of 1, larger
* buswidths will have larger limits.
*/
ret = dma_set_max_seg_size(&adev->dev, 1900800);
if (ret)
dev_err(&adev->dev, "unable to set the seg size\n");
init_pl330_debugfs(pl330);
dev_info(&adev->dev,
"Loaded driver for PL330 DMAC-%x\n", adev->periphid);
dev_info(&adev->dev,
"\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
pcfg->data_buf_dep, pcfg->data_bus_width / 8, pcfg->num_chan,
pcfg->num_peri, pcfg->num_events);
pm_runtime_irq_safe(&adev->dev);
pm_runtime_use_autosuspend(&adev->dev);
pm_runtime_set_autosuspend_delay(&adev->dev, PL330_AUTOSUSPEND_DELAY);
pm_runtime_mark_last_busy(&adev->dev);
pm_runtime_put_autosuspend(&adev->dev);
return 0;
probe_err3:
/* Idle the DMAC */
list_for_each_entry_safe(pch, _p, &pl330->ddma.channels,
chan.device_node) {
/* Remove the channel */
list_del(&pch->chan.device_node);
/* Flush the channel */
if (pch->thread) {
pl330_terminate_all(&pch->chan);
pl330_free_chan_resources(&pch->chan);
}
}
probe_err2:
pl330_del(pl330);
if (pl330->rstc_ocp)
reset_control_assert(pl330->rstc_ocp);
if (pl330->rstc)
reset_control_assert(pl330->rstc);
return ret;
}
static void pl330_remove(struct amba_device *adev)
{
struct pl330_dmac *pl330 = amba_get_drvdata(adev);
struct dma_pl330_chan *pch, *_p;
int i, irq;
pm_runtime_get_noresume(pl330->ddma.dev);
if (adev->dev.of_node)
of_dma_controller_free(adev->dev.of_node);
for (i = 0; i < AMBA_NR_IRQS; i++) {
irq = adev->irq[i];
if (irq)
devm_free_irq(&adev->dev, irq, pl330);
}
dma_async_device_unregister(&pl330->ddma);
/* Idle the DMAC */
list_for_each_entry_safe(pch, _p, &pl330->ddma.channels,
chan.device_node) {
/* Remove the channel */
list_del(&pch->chan.device_node);
/* Flush the channel */
if (pch->thread) {
pl330_terminate_all(&pch->chan);
pl330_free_chan_resources(&pch->chan);
}
}
pl330_del(pl330);
if (pl330->rstc_ocp)
reset_control_assert(pl330->rstc_ocp);
if (pl330->rstc)
reset_control_assert(pl330->rstc);
}
static const struct amba_id pl330_ids[] = {
{
.id = 0x00041330,
.mask = 0x000fffff,
},
{ 0, 0 },
};
MODULE_DEVICE_TABLE(amba, pl330_ids);
static struct amba_driver pl330_driver = {
.drv = {
.owner = THIS_MODULE,
.name = "dma-pl330",
.pm = &pl330_pm,
},
.id_table = pl330_ids,
.probe = pl330_probe,
.remove = pl330_remove,
};
module_amba_driver(pl330_driver);
MODULE_AUTHOR("Jaswinder Singh <[email protected]>");
MODULE_DESCRIPTION("API Driver for PL330 DMAC");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/pl330.c |
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2017 Broadcom
/*
* Broadcom SBA RAID Driver
*
* The Broadcom stream buffer accelerator (SBA) provides offloading
* capabilities for RAID operations. The SBA offload engine is accessible
* via Broadcom SoC specific ring manager. Two or more offload engines
* can share same Broadcom SoC specific ring manager due to this Broadcom
* SoC specific ring manager driver is implemented as a mailbox controller
* driver and offload engine drivers are implemented as mallbox clients.
*
* Typically, Broadcom SoC specific ring manager will implement larger
* number of hardware rings over one or more SBA hardware devices. By
* design, the internal buffer size of SBA hardware device is limited
* but all offload operations supported by SBA can be broken down into
* multiple small size requests and executed parallely on multiple SBA
* hardware devices for achieving high through-put.
*
* The Broadcom SBA RAID driver does not require any register programming
* except submitting request to SBA hardware device via mailbox channels.
* This driver implements a DMA device with one DMA channel using a single
* mailbox channel provided by Broadcom SoC specific ring manager driver.
* For having more SBA DMA channels, we can create more SBA device nodes
* in Broadcom SoC specific DTS based on number of hardware rings supported
* by Broadcom SoC ring manager.
*/
#include <linux/bitops.h>
#include <linux/debugfs.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/list.h>
#include <linux/mailbox_client.h>
#include <linux/mailbox/brcm-message.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/raid/pq.h>
#include "dmaengine.h"
/* ====== Driver macros and defines ===== */
#define SBA_TYPE_SHIFT 48
#define SBA_TYPE_MASK GENMASK(1, 0)
#define SBA_TYPE_A 0x0
#define SBA_TYPE_B 0x2
#define SBA_TYPE_C 0x3
#define SBA_USER_DEF_SHIFT 32
#define SBA_USER_DEF_MASK GENMASK(15, 0)
#define SBA_R_MDATA_SHIFT 24
#define SBA_R_MDATA_MASK GENMASK(7, 0)
#define SBA_C_MDATA_MS_SHIFT 18
#define SBA_C_MDATA_MS_MASK GENMASK(1, 0)
#define SBA_INT_SHIFT 17
#define SBA_INT_MASK BIT(0)
#define SBA_RESP_SHIFT 16
#define SBA_RESP_MASK BIT(0)
#define SBA_C_MDATA_SHIFT 8
#define SBA_C_MDATA_MASK GENMASK(7, 0)
#define SBA_C_MDATA_BNUMx_SHIFT(__bnum) (2 * (__bnum))
#define SBA_C_MDATA_BNUMx_MASK GENMASK(1, 0)
#define SBA_C_MDATA_DNUM_SHIFT 5
#define SBA_C_MDATA_DNUM_MASK GENMASK(4, 0)
#define SBA_C_MDATA_LS(__v) ((__v) & 0xff)
#define SBA_C_MDATA_MS(__v) (((__v) >> 8) & 0x3)
#define SBA_CMD_SHIFT 0
#define SBA_CMD_MASK GENMASK(3, 0)
#define SBA_CMD_ZERO_BUFFER 0x4
#define SBA_CMD_ZERO_ALL_BUFFERS 0x8
#define SBA_CMD_LOAD_BUFFER 0x9
#define SBA_CMD_XOR 0xa
#define SBA_CMD_GALOIS_XOR 0xb
#define SBA_CMD_WRITE_BUFFER 0xc
#define SBA_CMD_GALOIS 0xe
#define SBA_MAX_REQ_PER_MBOX_CHANNEL 8192
#define SBA_MAX_MSG_SEND_PER_MBOX_CHANNEL 8
/* Driver helper macros */
#define to_sba_request(tx) \
container_of(tx, struct sba_request, tx)
#define to_sba_device(dchan) \
container_of(dchan, struct sba_device, dma_chan)
/* ===== Driver data structures ===== */
enum sba_request_flags {
SBA_REQUEST_STATE_FREE = 0x001,
SBA_REQUEST_STATE_ALLOCED = 0x002,
SBA_REQUEST_STATE_PENDING = 0x004,
SBA_REQUEST_STATE_ACTIVE = 0x008,
SBA_REQUEST_STATE_ABORTED = 0x010,
SBA_REQUEST_STATE_MASK = 0x0ff,
SBA_REQUEST_FENCE = 0x100,
};
struct sba_request {
/* Global state */
struct list_head node;
struct sba_device *sba;
u32 flags;
/* Chained requests management */
struct sba_request *first;
struct list_head next;
atomic_t next_pending_count;
/* BRCM message data */
struct brcm_message msg;
struct dma_async_tx_descriptor tx;
/* SBA commands */
struct brcm_sba_command cmds[];
};
enum sba_version {
SBA_VER_1 = 0,
SBA_VER_2
};
struct sba_device {
/* Underlying device */
struct device *dev;
/* DT configuration parameters */
enum sba_version ver;
/* Derived configuration parameters */
u32 max_req;
u32 hw_buf_size;
u32 hw_resp_size;
u32 max_pq_coefs;
u32 max_pq_srcs;
u32 max_cmd_per_req;
u32 max_xor_srcs;
u32 max_resp_pool_size;
u32 max_cmds_pool_size;
/* Maibox client and Mailbox channels */
struct mbox_client client;
struct mbox_chan *mchan;
struct device *mbox_dev;
/* DMA device and DMA channel */
struct dma_device dma_dev;
struct dma_chan dma_chan;
/* DMA channel resources */
void *resp_base;
dma_addr_t resp_dma_base;
void *cmds_base;
dma_addr_t cmds_dma_base;
spinlock_t reqs_lock;
bool reqs_fence;
struct list_head reqs_alloc_list;
struct list_head reqs_pending_list;
struct list_head reqs_active_list;
struct list_head reqs_aborted_list;
struct list_head reqs_free_list;
/* DebugFS directory entries */
struct dentry *root;
};
/* ====== Command helper routines ===== */
static inline u64 __pure sba_cmd_enc(u64 cmd, u32 val, u32 shift, u32 mask)
{
cmd &= ~((u64)mask << shift);
cmd |= ((u64)(val & mask) << shift);
return cmd;
}
static inline u32 __pure sba_cmd_load_c_mdata(u32 b0)
{
return b0 & SBA_C_MDATA_BNUMx_MASK;
}
static inline u32 __pure sba_cmd_write_c_mdata(u32 b0)
{
return b0 & SBA_C_MDATA_BNUMx_MASK;
}
static inline u32 __pure sba_cmd_xor_c_mdata(u32 b1, u32 b0)
{
return (b0 & SBA_C_MDATA_BNUMx_MASK) |
((b1 & SBA_C_MDATA_BNUMx_MASK) << SBA_C_MDATA_BNUMx_SHIFT(1));
}
static inline u32 __pure sba_cmd_pq_c_mdata(u32 d, u32 b1, u32 b0)
{
return (b0 & SBA_C_MDATA_BNUMx_MASK) |
((b1 & SBA_C_MDATA_BNUMx_MASK) << SBA_C_MDATA_BNUMx_SHIFT(1)) |
((d & SBA_C_MDATA_DNUM_MASK) << SBA_C_MDATA_DNUM_SHIFT);
}
/* ====== General helper routines ===== */
static struct sba_request *sba_alloc_request(struct sba_device *sba)
{
bool found = false;
unsigned long flags;
struct sba_request *req = NULL;
spin_lock_irqsave(&sba->reqs_lock, flags);
list_for_each_entry(req, &sba->reqs_free_list, node) {
if (async_tx_test_ack(&req->tx)) {
list_move_tail(&req->node, &sba->reqs_alloc_list);
found = true;
break;
}
}
spin_unlock_irqrestore(&sba->reqs_lock, flags);
if (!found) {
/*
* We have no more free requests so, we peek
* mailbox channels hoping few active requests
* would have completed which will create more
* room for new requests.
*/
mbox_client_peek_data(sba->mchan);
return NULL;
}
req->flags = SBA_REQUEST_STATE_ALLOCED;
req->first = req;
INIT_LIST_HEAD(&req->next);
atomic_set(&req->next_pending_count, 1);
dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan);
async_tx_ack(&req->tx);
return req;
}
/* Note: Must be called with sba->reqs_lock held */
static void _sba_pending_request(struct sba_device *sba,
struct sba_request *req)
{
lockdep_assert_held(&sba->reqs_lock);
req->flags &= ~SBA_REQUEST_STATE_MASK;
req->flags |= SBA_REQUEST_STATE_PENDING;
list_move_tail(&req->node, &sba->reqs_pending_list);
if (list_empty(&sba->reqs_active_list))
sba->reqs_fence = false;
}
/* Note: Must be called with sba->reqs_lock held */
static bool _sba_active_request(struct sba_device *sba,
struct sba_request *req)
{
lockdep_assert_held(&sba->reqs_lock);
if (list_empty(&sba->reqs_active_list))
sba->reqs_fence = false;
if (sba->reqs_fence)
return false;
req->flags &= ~SBA_REQUEST_STATE_MASK;
req->flags |= SBA_REQUEST_STATE_ACTIVE;
list_move_tail(&req->node, &sba->reqs_active_list);
if (req->flags & SBA_REQUEST_FENCE)
sba->reqs_fence = true;
return true;
}
/* Note: Must be called with sba->reqs_lock held */
static void _sba_abort_request(struct sba_device *sba,
struct sba_request *req)
{
lockdep_assert_held(&sba->reqs_lock);
req->flags &= ~SBA_REQUEST_STATE_MASK;
req->flags |= SBA_REQUEST_STATE_ABORTED;
list_move_tail(&req->node, &sba->reqs_aborted_list);
if (list_empty(&sba->reqs_active_list))
sba->reqs_fence = false;
}
/* Note: Must be called with sba->reqs_lock held */
static void _sba_free_request(struct sba_device *sba,
struct sba_request *req)
{
lockdep_assert_held(&sba->reqs_lock);
req->flags &= ~SBA_REQUEST_STATE_MASK;
req->flags |= SBA_REQUEST_STATE_FREE;
list_move_tail(&req->node, &sba->reqs_free_list);
if (list_empty(&sba->reqs_active_list))
sba->reqs_fence = false;
}
static void sba_free_chained_requests(struct sba_request *req)
{
unsigned long flags;
struct sba_request *nreq;
struct sba_device *sba = req->sba;
spin_lock_irqsave(&sba->reqs_lock, flags);
_sba_free_request(sba, req);
list_for_each_entry(nreq, &req->next, next)
_sba_free_request(sba, nreq);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}
static void sba_chain_request(struct sba_request *first,
struct sba_request *req)
{
unsigned long flags;
struct sba_device *sba = req->sba;
spin_lock_irqsave(&sba->reqs_lock, flags);
list_add_tail(&req->next, &first->next);
req->first = first;
atomic_inc(&first->next_pending_count);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}
static void sba_cleanup_nonpending_requests(struct sba_device *sba)
{
unsigned long flags;
struct sba_request *req, *req1;
spin_lock_irqsave(&sba->reqs_lock, flags);
/* Freeup all alloced request */
list_for_each_entry_safe(req, req1, &sba->reqs_alloc_list, node)
_sba_free_request(sba, req);
/* Set all active requests as aborted */
list_for_each_entry_safe(req, req1, &sba->reqs_active_list, node)
_sba_abort_request(sba, req);
/*
* Note: We expect that aborted request will be eventually
* freed by sba_receive_message()
*/
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}
static void sba_cleanup_pending_requests(struct sba_device *sba)
{
unsigned long flags;
struct sba_request *req, *req1;
spin_lock_irqsave(&sba->reqs_lock, flags);
/* Freeup all pending request */
list_for_each_entry_safe(req, req1, &sba->reqs_pending_list, node)
_sba_free_request(sba, req);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}
static int sba_send_mbox_request(struct sba_device *sba,
struct sba_request *req)
{
int ret = 0;
/* Send message for the request */
req->msg.error = 0;
ret = mbox_send_message(sba->mchan, &req->msg);
if (ret < 0) {
dev_err(sba->dev, "send message failed with error %d", ret);
return ret;
}
/* Check error returned by mailbox controller */
ret = req->msg.error;
if (ret < 0) {
dev_err(sba->dev, "message error %d", ret);
}
/* Signal txdone for mailbox channel */
mbox_client_txdone(sba->mchan, ret);
return ret;
}
/* Note: Must be called with sba->reqs_lock held */
static void _sba_process_pending_requests(struct sba_device *sba)
{
int ret;
u32 count;
struct sba_request *req;
/* Process few pending requests */
count = SBA_MAX_MSG_SEND_PER_MBOX_CHANNEL;
while (!list_empty(&sba->reqs_pending_list) && count) {
/* Get the first pending request */
req = list_first_entry(&sba->reqs_pending_list,
struct sba_request, node);
/* Try to make request active */
if (!_sba_active_request(sba, req))
break;
/* Send request to mailbox channel */
ret = sba_send_mbox_request(sba, req);
if (ret < 0) {
_sba_pending_request(sba, req);
break;
}
count--;
}
}
static void sba_process_received_request(struct sba_device *sba,
struct sba_request *req)
{
unsigned long flags;
struct dma_async_tx_descriptor *tx;
struct sba_request *nreq, *first = req->first;
/* Process only after all chained requests are received */
if (!atomic_dec_return(&first->next_pending_count)) {
tx = &first->tx;
WARN_ON(tx->cookie < 0);
if (tx->cookie > 0) {
spin_lock_irqsave(&sba->reqs_lock, flags);
dma_cookie_complete(tx);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
dmaengine_desc_get_callback_invoke(tx, NULL);
dma_descriptor_unmap(tx);
tx->callback = NULL;
tx->callback_result = NULL;
}
dma_run_dependencies(tx);
spin_lock_irqsave(&sba->reqs_lock, flags);
/* Free all requests chained to first request */
list_for_each_entry(nreq, &first->next, next)
_sba_free_request(sba, nreq);
INIT_LIST_HEAD(&first->next);
/* Free the first request */
_sba_free_request(sba, first);
/* Process pending requests */
_sba_process_pending_requests(sba);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}
}
static void sba_write_stats_in_seqfile(struct sba_device *sba,
struct seq_file *file)
{
unsigned long flags;
struct sba_request *req;
u32 free_count = 0, alloced_count = 0;
u32 pending_count = 0, active_count = 0, aborted_count = 0;
spin_lock_irqsave(&sba->reqs_lock, flags);
list_for_each_entry(req, &sba->reqs_free_list, node)
if (async_tx_test_ack(&req->tx))
free_count++;
list_for_each_entry(req, &sba->reqs_alloc_list, node)
alloced_count++;
list_for_each_entry(req, &sba->reqs_pending_list, node)
pending_count++;
list_for_each_entry(req, &sba->reqs_active_list, node)
active_count++;
list_for_each_entry(req, &sba->reqs_aborted_list, node)
aborted_count++;
spin_unlock_irqrestore(&sba->reqs_lock, flags);
seq_printf(file, "maximum requests = %d\n", sba->max_req);
seq_printf(file, "free requests = %d\n", free_count);
seq_printf(file, "alloced requests = %d\n", alloced_count);
seq_printf(file, "pending requests = %d\n", pending_count);
seq_printf(file, "active requests = %d\n", active_count);
seq_printf(file, "aborted requests = %d\n", aborted_count);
}
/* ====== DMAENGINE callbacks ===== */
static void sba_free_chan_resources(struct dma_chan *dchan)
{
/*
* Channel resources are pre-alloced so we just free-up
* whatever we can so that we can re-use pre-alloced
* channel resources next time.
*/
sba_cleanup_nonpending_requests(to_sba_device(dchan));
}
static int sba_device_terminate_all(struct dma_chan *dchan)
{
/* Cleanup all pending requests */
sba_cleanup_pending_requests(to_sba_device(dchan));
return 0;
}
static void sba_issue_pending(struct dma_chan *dchan)
{
unsigned long flags;
struct sba_device *sba = to_sba_device(dchan);
/* Process pending requests */
spin_lock_irqsave(&sba->reqs_lock, flags);
_sba_process_pending_requests(sba);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}
static dma_cookie_t sba_tx_submit(struct dma_async_tx_descriptor *tx)
{
unsigned long flags;
dma_cookie_t cookie;
struct sba_device *sba;
struct sba_request *req, *nreq;
if (unlikely(!tx))
return -EINVAL;
sba = to_sba_device(tx->chan);
req = to_sba_request(tx);
/* Assign cookie and mark all chained requests pending */
spin_lock_irqsave(&sba->reqs_lock, flags);
cookie = dma_cookie_assign(tx);
_sba_pending_request(sba, req);
list_for_each_entry(nreq, &req->next, next)
_sba_pending_request(sba, nreq);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
return cookie;
}
static enum dma_status sba_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
enum dma_status ret;
struct sba_device *sba = to_sba_device(dchan);
ret = dma_cookie_status(dchan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
mbox_client_peek_data(sba->mchan);
return dma_cookie_status(dchan, cookie, txstate);
}
static void sba_fillup_interrupt_msg(struct sba_request *req,
struct brcm_sba_command *cmds,
struct brcm_message *msg)
{
u64 cmd;
u32 c_mdata;
dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;
/* Type-B command to load dummy data into buf0 */
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, req->sba->hw_resp_size,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_load_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = resp_dma;
cmdsp->data_len = req->sba->hw_resp_size;
cmdsp++;
/* Type-A command to write buf0 to dummy location */
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, req->sba->hw_resp_size,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
cmd = sba_cmd_enc(cmd, 0x1,
SBA_RESP_SHIFT, SBA_RESP_MASK);
c_mdata = sba_cmd_write_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
cmdsp->data = resp_dma;
cmdsp->data_len = req->sba->hw_resp_size;
cmdsp++;
/* Fillup brcm_message */
msg->type = BRCM_MESSAGE_SBA;
msg->sba.cmds = cmds;
msg->sba.cmds_count = cmdsp - cmds;
msg->ctx = req;
msg->error = 0;
}
static struct dma_async_tx_descriptor *
sba_prep_dma_interrupt(struct dma_chan *dchan, unsigned long flags)
{
struct sba_request *req = NULL;
struct sba_device *sba = to_sba_device(dchan);
/* Alloc new request */
req = sba_alloc_request(sba);
if (!req)
return NULL;
/*
* Force fence so that no requests are submitted
* until DMA callback for this request is invoked.
*/
req->flags |= SBA_REQUEST_FENCE;
/* Fillup request message */
sba_fillup_interrupt_msg(req, req->cmds, &req->msg);
/* Init async_tx descriptor */
req->tx.flags = flags;
req->tx.cookie = -EBUSY;
return &req->tx;
}
static void sba_fillup_memcpy_msg(struct sba_request *req,
struct brcm_sba_command *cmds,
struct brcm_message *msg,
dma_addr_t msg_offset, size_t msg_len,
dma_addr_t dst, dma_addr_t src)
{
u64 cmd;
u32 c_mdata;
dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;
/* Type-B command to load data into buf0 */
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_load_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = src + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
/* Type-A command to write buf0 */
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
cmd = sba_cmd_enc(cmd, 0x1,
SBA_RESP_SHIFT, SBA_RESP_MASK);
c_mdata = sba_cmd_write_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
cmdsp->data = dst + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
/* Fillup brcm_message */
msg->type = BRCM_MESSAGE_SBA;
msg->sba.cmds = cmds;
msg->sba.cmds_count = cmdsp - cmds;
msg->ctx = req;
msg->error = 0;
}
static struct sba_request *
sba_prep_dma_memcpy_req(struct sba_device *sba,
dma_addr_t off, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct sba_request *req = NULL;
/* Alloc new request */
req = sba_alloc_request(sba);
if (!req)
return NULL;
if (flags & DMA_PREP_FENCE)
req->flags |= SBA_REQUEST_FENCE;
/* Fillup request message */
sba_fillup_memcpy_msg(req, req->cmds, &req->msg,
off, len, dst, src);
/* Init async_tx descriptor */
req->tx.flags = flags;
req->tx.cookie = -EBUSY;
return req;
}
static struct dma_async_tx_descriptor *
sba_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
size_t req_len;
dma_addr_t off = 0;
struct sba_device *sba = to_sba_device(dchan);
struct sba_request *first = NULL, *req;
/* Create chained requests where each request is upto hw_buf_size */
while (len) {
req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size;
req = sba_prep_dma_memcpy_req(sba, off, dst, src,
req_len, flags);
if (!req) {
if (first)
sba_free_chained_requests(first);
return NULL;
}
if (first)
sba_chain_request(first, req);
else
first = req;
off += req_len;
len -= req_len;
}
return (first) ? &first->tx : NULL;
}
static void sba_fillup_xor_msg(struct sba_request *req,
struct brcm_sba_command *cmds,
struct brcm_message *msg,
dma_addr_t msg_offset, size_t msg_len,
dma_addr_t dst, dma_addr_t *src, u32 src_cnt)
{
u64 cmd;
u32 c_mdata;
unsigned int i;
dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;
/* Type-B command to load data into buf0 */
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_load_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = src[0] + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
/* Type-B commands to xor data with buf0 and put it back in buf0 */
for (i = 1; i < src_cnt; i++) {
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_xor_c_mdata(0, 0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_XOR,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = src[i] + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
}
/* Type-A command to write buf0 */
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
cmd = sba_cmd_enc(cmd, 0x1,
SBA_RESP_SHIFT, SBA_RESP_MASK);
c_mdata = sba_cmd_write_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
cmdsp->data = dst + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
/* Fillup brcm_message */
msg->type = BRCM_MESSAGE_SBA;
msg->sba.cmds = cmds;
msg->sba.cmds_count = cmdsp - cmds;
msg->ctx = req;
msg->error = 0;
}
static struct sba_request *
sba_prep_dma_xor_req(struct sba_device *sba,
dma_addr_t off, dma_addr_t dst, dma_addr_t *src,
u32 src_cnt, size_t len, unsigned long flags)
{
struct sba_request *req = NULL;
/* Alloc new request */
req = sba_alloc_request(sba);
if (!req)
return NULL;
if (flags & DMA_PREP_FENCE)
req->flags |= SBA_REQUEST_FENCE;
/* Fillup request message */
sba_fillup_xor_msg(req, req->cmds, &req->msg,
off, len, dst, src, src_cnt);
/* Init async_tx descriptor */
req->tx.flags = flags;
req->tx.cookie = -EBUSY;
return req;
}
static struct dma_async_tx_descriptor *
sba_prep_dma_xor(struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src,
u32 src_cnt, size_t len, unsigned long flags)
{
size_t req_len;
dma_addr_t off = 0;
struct sba_device *sba = to_sba_device(dchan);
struct sba_request *first = NULL, *req;
/* Sanity checks */
if (unlikely(src_cnt > sba->max_xor_srcs))
return NULL;
/* Create chained requests where each request is upto hw_buf_size */
while (len) {
req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size;
req = sba_prep_dma_xor_req(sba, off, dst, src, src_cnt,
req_len, flags);
if (!req) {
if (first)
sba_free_chained_requests(first);
return NULL;
}
if (first)
sba_chain_request(first, req);
else
first = req;
off += req_len;
len -= req_len;
}
return (first) ? &first->tx : NULL;
}
static void sba_fillup_pq_msg(struct sba_request *req,
bool pq_continue,
struct brcm_sba_command *cmds,
struct brcm_message *msg,
dma_addr_t msg_offset, size_t msg_len,
dma_addr_t *dst_p, dma_addr_t *dst_q,
const u8 *scf, dma_addr_t *src, u32 src_cnt)
{
u64 cmd;
u32 c_mdata;
unsigned int i;
dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;
if (pq_continue) {
/* Type-B command to load old P into buf0 */
if (dst_p) {
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_load_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = *dst_p + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
}
/* Type-B command to load old Q into buf1 */
if (dst_q) {
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_load_c_mdata(1);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = *dst_q + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
}
} else {
/* Type-A command to zero all buffers */
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_ZERO_ALL_BUFFERS,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
cmdsp++;
}
/* Type-B commands for generate P onto buf0 and Q onto buf1 */
for (i = 0; i < src_cnt; i++) {
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_pq_c_mdata(raid6_gflog[scf[i]], 1, 0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata),
SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS_XOR,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = src[i] + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
}
/* Type-A command to write buf0 */
if (dst_p) {
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
cmd = sba_cmd_enc(cmd, 0x1,
SBA_RESP_SHIFT, SBA_RESP_MASK);
c_mdata = sba_cmd_write_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
cmdsp->data = *dst_p + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
}
/* Type-A command to write buf1 */
if (dst_q) {
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
cmd = sba_cmd_enc(cmd, 0x1,
SBA_RESP_SHIFT, SBA_RESP_MASK);
c_mdata = sba_cmd_write_c_mdata(1);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
cmdsp->data = *dst_q + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
}
/* Fillup brcm_message */
msg->type = BRCM_MESSAGE_SBA;
msg->sba.cmds = cmds;
msg->sba.cmds_count = cmdsp - cmds;
msg->ctx = req;
msg->error = 0;
}
static struct sba_request *
sba_prep_dma_pq_req(struct sba_device *sba, dma_addr_t off,
dma_addr_t *dst_p, dma_addr_t *dst_q, dma_addr_t *src,
u32 src_cnt, const u8 *scf, size_t len, unsigned long flags)
{
struct sba_request *req = NULL;
/* Alloc new request */
req = sba_alloc_request(sba);
if (!req)
return NULL;
if (flags & DMA_PREP_FENCE)
req->flags |= SBA_REQUEST_FENCE;
/* Fillup request messages */
sba_fillup_pq_msg(req, dmaf_continue(flags),
req->cmds, &req->msg,
off, len, dst_p, dst_q, scf, src, src_cnt);
/* Init async_tx descriptor */
req->tx.flags = flags;
req->tx.cookie = -EBUSY;
return req;
}
static void sba_fillup_pq_single_msg(struct sba_request *req,
bool pq_continue,
struct brcm_sba_command *cmds,
struct brcm_message *msg,
dma_addr_t msg_offset, size_t msg_len,
dma_addr_t *dst_p, dma_addr_t *dst_q,
dma_addr_t src, u8 scf)
{
u64 cmd;
u32 c_mdata;
u8 pos, dpos = raid6_gflog[scf];
dma_addr_t resp_dma = req->tx.phys;
struct brcm_sba_command *cmdsp = cmds;
if (!dst_p)
goto skip_p;
if (pq_continue) {
/* Type-B command to load old P into buf0 */
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_load_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = *dst_p + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
/*
* Type-B commands to xor data with buf0 and put it
* back in buf0
*/
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_xor_c_mdata(0, 0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_XOR,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = src + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
} else {
/* Type-B command to load old P into buf0 */
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_load_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_LOAD_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = src + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
}
/* Type-A command to write buf0 */
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
cmd = sba_cmd_enc(cmd, 0x1,
SBA_RESP_SHIFT, SBA_RESP_MASK);
c_mdata = sba_cmd_write_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
cmdsp->data = *dst_p + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
skip_p:
if (!dst_q)
goto skip_q;
/* Type-A command to zero all buffers */
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_ZERO_ALL_BUFFERS,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
cmdsp++;
if (dpos == 255)
goto skip_q_computation;
pos = (dpos < req->sba->max_pq_coefs) ?
dpos : (req->sba->max_pq_coefs - 1);
/*
* Type-B command to generate initial Q from data
* and store output into buf0
*/
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_pq_c_mdata(pos, 0, 0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata),
SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = src + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
dpos -= pos;
/* Multiple Type-A command to generate final Q */
while (dpos) {
pos = (dpos < req->sba->max_pq_coefs) ?
dpos : (req->sba->max_pq_coefs - 1);
/*
* Type-A command to generate Q with buf0 and
* buf1 store result in buf0
*/
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_pq_c_mdata(pos, 0, 1);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_MS(c_mdata),
SBA_C_MDATA_MS_SHIFT, SBA_C_MDATA_MS_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_GALOIS,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
cmdsp++;
dpos -= pos;
}
skip_q_computation:
if (pq_continue) {
/*
* Type-B command to XOR previous output with
* buf0 and write it into buf0
*/
cmd = sba_cmd_enc(0x0, SBA_TYPE_B,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
c_mdata = sba_cmd_xor_c_mdata(0, 0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_XOR,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_B;
cmdsp->data = *dst_q + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
}
/* Type-A command to write buf0 */
cmd = sba_cmd_enc(0x0, SBA_TYPE_A,
SBA_TYPE_SHIFT, SBA_TYPE_MASK);
cmd = sba_cmd_enc(cmd, msg_len,
SBA_USER_DEF_SHIFT, SBA_USER_DEF_MASK);
cmd = sba_cmd_enc(cmd, 0x1,
SBA_RESP_SHIFT, SBA_RESP_MASK);
c_mdata = sba_cmd_write_c_mdata(0);
cmd = sba_cmd_enc(cmd, SBA_C_MDATA_LS(c_mdata),
SBA_C_MDATA_SHIFT, SBA_C_MDATA_MASK);
cmd = sba_cmd_enc(cmd, SBA_CMD_WRITE_BUFFER,
SBA_CMD_SHIFT, SBA_CMD_MASK);
cmdsp->cmd = cmd;
*cmdsp->cmd_dma = cpu_to_le64(cmd);
cmdsp->flags = BRCM_SBA_CMD_TYPE_A;
if (req->sba->hw_resp_size) {
cmdsp->flags |= BRCM_SBA_CMD_HAS_RESP;
cmdsp->resp = resp_dma;
cmdsp->resp_len = req->sba->hw_resp_size;
}
cmdsp->flags |= BRCM_SBA_CMD_HAS_OUTPUT;
cmdsp->data = *dst_q + msg_offset;
cmdsp->data_len = msg_len;
cmdsp++;
skip_q:
/* Fillup brcm_message */
msg->type = BRCM_MESSAGE_SBA;
msg->sba.cmds = cmds;
msg->sba.cmds_count = cmdsp - cmds;
msg->ctx = req;
msg->error = 0;
}
static struct sba_request *
sba_prep_dma_pq_single_req(struct sba_device *sba, dma_addr_t off,
dma_addr_t *dst_p, dma_addr_t *dst_q,
dma_addr_t src, u8 scf, size_t len,
unsigned long flags)
{
struct sba_request *req = NULL;
/* Alloc new request */
req = sba_alloc_request(sba);
if (!req)
return NULL;
if (flags & DMA_PREP_FENCE)
req->flags |= SBA_REQUEST_FENCE;
/* Fillup request messages */
sba_fillup_pq_single_msg(req, dmaf_continue(flags),
req->cmds, &req->msg, off, len,
dst_p, dst_q, src, scf);
/* Init async_tx descriptor */
req->tx.flags = flags;
req->tx.cookie = -EBUSY;
return req;
}
static struct dma_async_tx_descriptor *
sba_prep_dma_pq(struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src,
u32 src_cnt, const u8 *scf, size_t len, unsigned long flags)
{
u32 i, dst_q_index;
size_t req_len;
bool slow = false;
dma_addr_t off = 0;
dma_addr_t *dst_p = NULL, *dst_q = NULL;
struct sba_device *sba = to_sba_device(dchan);
struct sba_request *first = NULL, *req;
/* Sanity checks */
if (unlikely(src_cnt > sba->max_pq_srcs))
return NULL;
for (i = 0; i < src_cnt; i++)
if (sba->max_pq_coefs <= raid6_gflog[scf[i]])
slow = true;
/* Figure-out P and Q destination addresses */
if (!(flags & DMA_PREP_PQ_DISABLE_P))
dst_p = &dst[0];
if (!(flags & DMA_PREP_PQ_DISABLE_Q))
dst_q = &dst[1];
/* Create chained requests where each request is upto hw_buf_size */
while (len) {
req_len = (len < sba->hw_buf_size) ? len : sba->hw_buf_size;
if (slow) {
dst_q_index = src_cnt;
if (dst_q) {
for (i = 0; i < src_cnt; i++) {
if (*dst_q == src[i]) {
dst_q_index = i;
break;
}
}
}
if (dst_q_index < src_cnt) {
i = dst_q_index;
req = sba_prep_dma_pq_single_req(sba,
off, dst_p, dst_q, src[i], scf[i],
req_len, flags | DMA_PREP_FENCE);
if (!req)
goto fail;
if (first)
sba_chain_request(first, req);
else
first = req;
flags |= DMA_PREP_CONTINUE;
}
for (i = 0; i < src_cnt; i++) {
if (dst_q_index == i)
continue;
req = sba_prep_dma_pq_single_req(sba,
off, dst_p, dst_q, src[i], scf[i],
req_len, flags | DMA_PREP_FENCE);
if (!req)
goto fail;
if (first)
sba_chain_request(first, req);
else
first = req;
flags |= DMA_PREP_CONTINUE;
}
} else {
req = sba_prep_dma_pq_req(sba, off,
dst_p, dst_q, src, src_cnt,
scf, req_len, flags);
if (!req)
goto fail;
if (first)
sba_chain_request(first, req);
else
first = req;
}
off += req_len;
len -= req_len;
}
return (first) ? &first->tx : NULL;
fail:
if (first)
sba_free_chained_requests(first);
return NULL;
}
/* ====== Mailbox callbacks ===== */
static void sba_receive_message(struct mbox_client *cl, void *msg)
{
struct brcm_message *m = msg;
struct sba_request *req = m->ctx;
struct sba_device *sba = req->sba;
/* Error count if message has error */
if (m->error < 0)
dev_err(sba->dev, "%s got message with error %d",
dma_chan_name(&sba->dma_chan), m->error);
/* Process received request */
sba_process_received_request(sba, req);
}
/* ====== Debugfs callbacks ====== */
static int sba_debugfs_stats_show(struct seq_file *file, void *offset)
{
struct sba_device *sba = dev_get_drvdata(file->private);
/* Write stats in file */
sba_write_stats_in_seqfile(sba, file);
return 0;
}
/* ====== Platform driver routines ===== */
static int sba_prealloc_channel_resources(struct sba_device *sba)
{
int i, j, ret = 0;
struct sba_request *req = NULL;
sba->resp_base = dma_alloc_coherent(sba->mbox_dev,
sba->max_resp_pool_size,
&sba->resp_dma_base, GFP_KERNEL);
if (!sba->resp_base)
return -ENOMEM;
sba->cmds_base = dma_alloc_coherent(sba->mbox_dev,
sba->max_cmds_pool_size,
&sba->cmds_dma_base, GFP_KERNEL);
if (!sba->cmds_base) {
ret = -ENOMEM;
goto fail_free_resp_pool;
}
spin_lock_init(&sba->reqs_lock);
sba->reqs_fence = false;
INIT_LIST_HEAD(&sba->reqs_alloc_list);
INIT_LIST_HEAD(&sba->reqs_pending_list);
INIT_LIST_HEAD(&sba->reqs_active_list);
INIT_LIST_HEAD(&sba->reqs_aborted_list);
INIT_LIST_HEAD(&sba->reqs_free_list);
for (i = 0; i < sba->max_req; i++) {
req = devm_kzalloc(sba->dev,
struct_size(req, cmds, sba->max_cmd_per_req),
GFP_KERNEL);
if (!req) {
ret = -ENOMEM;
goto fail_free_cmds_pool;
}
INIT_LIST_HEAD(&req->node);
req->sba = sba;
req->flags = SBA_REQUEST_STATE_FREE;
INIT_LIST_HEAD(&req->next);
atomic_set(&req->next_pending_count, 0);
for (j = 0; j < sba->max_cmd_per_req; j++) {
req->cmds[j].cmd = 0;
req->cmds[j].cmd_dma = sba->cmds_base +
(i * sba->max_cmd_per_req + j) * sizeof(u64);
req->cmds[j].cmd_dma_addr = sba->cmds_dma_base +
(i * sba->max_cmd_per_req + j) * sizeof(u64);
req->cmds[j].flags = 0;
}
memset(&req->msg, 0, sizeof(req->msg));
dma_async_tx_descriptor_init(&req->tx, &sba->dma_chan);
async_tx_ack(&req->tx);
req->tx.tx_submit = sba_tx_submit;
req->tx.phys = sba->resp_dma_base + i * sba->hw_resp_size;
list_add_tail(&req->node, &sba->reqs_free_list);
}
return 0;
fail_free_cmds_pool:
dma_free_coherent(sba->mbox_dev,
sba->max_cmds_pool_size,
sba->cmds_base, sba->cmds_dma_base);
fail_free_resp_pool:
dma_free_coherent(sba->mbox_dev,
sba->max_resp_pool_size,
sba->resp_base, sba->resp_dma_base);
return ret;
}
static void sba_freeup_channel_resources(struct sba_device *sba)
{
dmaengine_terminate_all(&sba->dma_chan);
dma_free_coherent(sba->mbox_dev, sba->max_cmds_pool_size,
sba->cmds_base, sba->cmds_dma_base);
dma_free_coherent(sba->mbox_dev, sba->max_resp_pool_size,
sba->resp_base, sba->resp_dma_base);
sba->resp_base = NULL;
sba->resp_dma_base = 0;
}
static int sba_async_register(struct sba_device *sba)
{
int ret;
struct dma_device *dma_dev = &sba->dma_dev;
/* Initialize DMA channel cookie */
sba->dma_chan.device = dma_dev;
dma_cookie_init(&sba->dma_chan);
/* Initialize DMA device capability mask */
dma_cap_zero(dma_dev->cap_mask);
dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask);
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
dma_cap_set(DMA_XOR, dma_dev->cap_mask);
dma_cap_set(DMA_PQ, dma_dev->cap_mask);
/*
* Set mailbox channel device as the base device of
* our dma_device because the actual memory accesses
* will be done by mailbox controller
*/
dma_dev->dev = sba->mbox_dev;
/* Set base prep routines */
dma_dev->device_free_chan_resources = sba_free_chan_resources;
dma_dev->device_terminate_all = sba_device_terminate_all;
dma_dev->device_issue_pending = sba_issue_pending;
dma_dev->device_tx_status = sba_tx_status;
/* Set interrupt routine */
if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
dma_dev->device_prep_dma_interrupt = sba_prep_dma_interrupt;
/* Set memcpy routine */
if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
dma_dev->device_prep_dma_memcpy = sba_prep_dma_memcpy;
/* Set xor routine and capability */
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
dma_dev->device_prep_dma_xor = sba_prep_dma_xor;
dma_dev->max_xor = sba->max_xor_srcs;
}
/* Set pq routine and capability */
if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
dma_dev->device_prep_dma_pq = sba_prep_dma_pq;
dma_set_maxpq(dma_dev, sba->max_pq_srcs, 0);
}
/* Initialize DMA device channel list */
INIT_LIST_HEAD(&dma_dev->channels);
list_add_tail(&sba->dma_chan.device_node, &dma_dev->channels);
/* Register with Linux async DMA framework*/
ret = dma_async_device_register(dma_dev);
if (ret) {
dev_err(sba->dev, "async device register error %d", ret);
return ret;
}
dev_info(sba->dev, "%s capabilities: %s%s%s%s\n",
dma_chan_name(&sba->dma_chan),
dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "interrupt " : "",
dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "memcpy " : "",
dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "");
return 0;
}
static int sba_probe(struct platform_device *pdev)
{
int ret = 0;
struct sba_device *sba;
struct platform_device *mbox_pdev;
struct of_phandle_args args;
/* Allocate main SBA struct */
sba = devm_kzalloc(&pdev->dev, sizeof(*sba), GFP_KERNEL);
if (!sba)
return -ENOMEM;
sba->dev = &pdev->dev;
platform_set_drvdata(pdev, sba);
/* Number of mailbox channels should be atleast 1 */
ret = of_count_phandle_with_args(pdev->dev.of_node,
"mboxes", "#mbox-cells");
if (ret <= 0)
return -ENODEV;
/* Determine SBA version from DT compatible string */
if (of_device_is_compatible(sba->dev->of_node, "brcm,iproc-sba"))
sba->ver = SBA_VER_1;
else if (of_device_is_compatible(sba->dev->of_node,
"brcm,iproc-sba-v2"))
sba->ver = SBA_VER_2;
else
return -ENODEV;
/* Derived Configuration parameters */
switch (sba->ver) {
case SBA_VER_1:
sba->hw_buf_size = 4096;
sba->hw_resp_size = 8;
sba->max_pq_coefs = 6;
sba->max_pq_srcs = 6;
break;
case SBA_VER_2:
sba->hw_buf_size = 4096;
sba->hw_resp_size = 8;
sba->max_pq_coefs = 30;
/*
* We can support max_pq_srcs == max_pq_coefs because
* we are limited by number of SBA commands that we can
* fit in one message for underlying ring manager HW.
*/
sba->max_pq_srcs = 12;
break;
default:
return -EINVAL;
}
sba->max_req = SBA_MAX_REQ_PER_MBOX_CHANNEL;
sba->max_cmd_per_req = sba->max_pq_srcs + 3;
sba->max_xor_srcs = sba->max_cmd_per_req - 1;
sba->max_resp_pool_size = sba->max_req * sba->hw_resp_size;
sba->max_cmds_pool_size = sba->max_req *
sba->max_cmd_per_req * sizeof(u64);
/* Setup mailbox client */
sba->client.dev = &pdev->dev;
sba->client.rx_callback = sba_receive_message;
sba->client.tx_block = false;
sba->client.knows_txdone = true;
sba->client.tx_tout = 0;
/* Request mailbox channel */
sba->mchan = mbox_request_channel(&sba->client, 0);
if (IS_ERR(sba->mchan)) {
ret = PTR_ERR(sba->mchan);
goto fail_free_mchan;
}
/* Find-out underlying mailbox device */
ret = of_parse_phandle_with_args(pdev->dev.of_node,
"mboxes", "#mbox-cells", 0, &args);
if (ret)
goto fail_free_mchan;
mbox_pdev = of_find_device_by_node(args.np);
of_node_put(args.np);
if (!mbox_pdev) {
ret = -ENODEV;
goto fail_free_mchan;
}
sba->mbox_dev = &mbox_pdev->dev;
/* Prealloc channel resource */
ret = sba_prealloc_channel_resources(sba);
if (ret)
goto fail_free_mchan;
/* Check availability of debugfs */
if (!debugfs_initialized())
goto skip_debugfs;
/* Create debugfs root entry */
sba->root = debugfs_create_dir(dev_name(sba->dev), NULL);
/* Create debugfs stats entry */
debugfs_create_devm_seqfile(sba->dev, "stats", sba->root,
sba_debugfs_stats_show);
skip_debugfs:
/* Register DMA device with Linux async framework */
ret = sba_async_register(sba);
if (ret)
goto fail_free_resources;
/* Print device info */
dev_info(sba->dev, "%s using SBAv%d mailbox channel from %s",
dma_chan_name(&sba->dma_chan), sba->ver+1,
dev_name(sba->mbox_dev));
return 0;
fail_free_resources:
debugfs_remove_recursive(sba->root);
sba_freeup_channel_resources(sba);
fail_free_mchan:
mbox_free_channel(sba->mchan);
return ret;
}
static int sba_remove(struct platform_device *pdev)
{
struct sba_device *sba = platform_get_drvdata(pdev);
dma_async_device_unregister(&sba->dma_dev);
debugfs_remove_recursive(sba->root);
sba_freeup_channel_resources(sba);
mbox_free_channel(sba->mchan);
return 0;
}
static const struct of_device_id sba_of_match[] = {
{ .compatible = "brcm,iproc-sba", },
{ .compatible = "brcm,iproc-sba-v2", },
{},
};
MODULE_DEVICE_TABLE(of, sba_of_match);
static struct platform_driver sba_driver = {
.probe = sba_probe,
.remove = sba_remove,
.driver = {
.name = "bcm-sba-raid",
.of_match_table = sba_of_match,
},
};
module_platform_driver(sba_driver);
MODULE_DESCRIPTION("Broadcom SBA RAID driver");
MODULE_AUTHOR("Anup Patel <[email protected]>");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/bcm-sba-raid.c |
// SPDX-License-Identifier: GPL-2.0
/*
* External DMA controller driver for UniPhier SoCs
* Copyright 2019 Socionext Inc.
* Author: Kunihiko Hayashi <[email protected]>
*/
#include <linux/bitops.h>
#include <linux/bitfield.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "dmaengine.h"
#include "virt-dma.h"
#define XDMAC_CH_WIDTH 0x100
#define XDMAC_TFA 0x08
#define XDMAC_TFA_MCNT_MASK GENMASK(23, 16)
#define XDMAC_TFA_MASK GENMASK(5, 0)
#define XDMAC_SADM 0x10
#define XDMAC_SADM_STW_MASK GENMASK(25, 24)
#define XDMAC_SADM_SAM BIT(4)
#define XDMAC_SADM_SAM_FIXED XDMAC_SADM_SAM
#define XDMAC_SADM_SAM_INC 0
#define XDMAC_DADM 0x14
#define XDMAC_DADM_DTW_MASK XDMAC_SADM_STW_MASK
#define XDMAC_DADM_DAM XDMAC_SADM_SAM
#define XDMAC_DADM_DAM_FIXED XDMAC_SADM_SAM_FIXED
#define XDMAC_DADM_DAM_INC XDMAC_SADM_SAM_INC
#define XDMAC_EXSAD 0x18
#define XDMAC_EXDAD 0x1c
#define XDMAC_SAD 0x20
#define XDMAC_DAD 0x24
#define XDMAC_ITS 0x28
#define XDMAC_ITS_MASK GENMASK(25, 0)
#define XDMAC_TNUM 0x2c
#define XDMAC_TNUM_MASK GENMASK(15, 0)
#define XDMAC_TSS 0x30
#define XDMAC_TSS_REQ BIT(0)
#define XDMAC_IEN 0x34
#define XDMAC_IEN_ERRIEN BIT(1)
#define XDMAC_IEN_ENDIEN BIT(0)
#define XDMAC_STAT 0x40
#define XDMAC_STAT_TENF BIT(0)
#define XDMAC_IR 0x44
#define XDMAC_IR_ERRF BIT(1)
#define XDMAC_IR_ENDF BIT(0)
#define XDMAC_ID 0x48
#define XDMAC_ID_ERRIDF BIT(1)
#define XDMAC_ID_ENDIDF BIT(0)
#define XDMAC_MAX_CHANS 16
#define XDMAC_INTERVAL_CLKS 20
#define XDMAC_MAX_WORDS XDMAC_TNUM_MASK
/* cut lower bit for maintain alignment of maximum transfer size */
#define XDMAC_MAX_WORD_SIZE (XDMAC_ITS_MASK & ~GENMASK(3, 0))
#define UNIPHIER_XDMAC_BUSWIDTHS \
(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
struct uniphier_xdmac_desc_node {
dma_addr_t src;
dma_addr_t dst;
u32 burst_size;
u32 nr_burst;
};
struct uniphier_xdmac_desc {
struct virt_dma_desc vd;
unsigned int nr_node;
unsigned int cur_node;
enum dma_transfer_direction dir;
struct uniphier_xdmac_desc_node nodes[];
};
struct uniphier_xdmac_chan {
struct virt_dma_chan vc;
struct uniphier_xdmac_device *xdev;
struct uniphier_xdmac_desc *xd;
void __iomem *reg_ch_base;
struct dma_slave_config sconfig;
int id;
unsigned int req_factor;
};
struct uniphier_xdmac_device {
struct dma_device ddev;
void __iomem *reg_base;
int nr_chans;
struct uniphier_xdmac_chan channels[];
};
static struct uniphier_xdmac_chan *
to_uniphier_xdmac_chan(struct virt_dma_chan *vc)
{
return container_of(vc, struct uniphier_xdmac_chan, vc);
}
static struct uniphier_xdmac_desc *
to_uniphier_xdmac_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct uniphier_xdmac_desc, vd);
}
/* xc->vc.lock must be held by caller */
static struct uniphier_xdmac_desc *
uniphier_xdmac_next_desc(struct uniphier_xdmac_chan *xc)
{
struct virt_dma_desc *vd;
vd = vchan_next_desc(&xc->vc);
if (!vd)
return NULL;
list_del(&vd->node);
return to_uniphier_xdmac_desc(vd);
}
/* xc->vc.lock must be held by caller */
static void uniphier_xdmac_chan_start(struct uniphier_xdmac_chan *xc,
struct uniphier_xdmac_desc *xd)
{
u32 src_mode, src_width;
u32 dst_mode, dst_width;
dma_addr_t src_addr, dst_addr;
u32 val, its, tnum;
enum dma_slave_buswidth buswidth;
src_addr = xd->nodes[xd->cur_node].src;
dst_addr = xd->nodes[xd->cur_node].dst;
its = xd->nodes[xd->cur_node].burst_size;
tnum = xd->nodes[xd->cur_node].nr_burst;
/*
* The width of MEM side must be 4 or 8 bytes, that does not
* affect that of DEV side and transfer size.
*/
if (xd->dir == DMA_DEV_TO_MEM) {
src_mode = XDMAC_SADM_SAM_FIXED;
buswidth = xc->sconfig.src_addr_width;
} else {
src_mode = XDMAC_SADM_SAM_INC;
buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES;
}
src_width = FIELD_PREP(XDMAC_SADM_STW_MASK, __ffs(buswidth));
if (xd->dir == DMA_MEM_TO_DEV) {
dst_mode = XDMAC_DADM_DAM_FIXED;
buswidth = xc->sconfig.dst_addr_width;
} else {
dst_mode = XDMAC_DADM_DAM_INC;
buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES;
}
dst_width = FIELD_PREP(XDMAC_DADM_DTW_MASK, __ffs(buswidth));
/* setup transfer factor */
val = FIELD_PREP(XDMAC_TFA_MCNT_MASK, XDMAC_INTERVAL_CLKS);
val |= FIELD_PREP(XDMAC_TFA_MASK, xc->req_factor);
writel(val, xc->reg_ch_base + XDMAC_TFA);
/* setup the channel */
writel(lower_32_bits(src_addr), xc->reg_ch_base + XDMAC_SAD);
writel(upper_32_bits(src_addr), xc->reg_ch_base + XDMAC_EXSAD);
writel(lower_32_bits(dst_addr), xc->reg_ch_base + XDMAC_DAD);
writel(upper_32_bits(dst_addr), xc->reg_ch_base + XDMAC_EXDAD);
src_mode |= src_width;
dst_mode |= dst_width;
writel(src_mode, xc->reg_ch_base + XDMAC_SADM);
writel(dst_mode, xc->reg_ch_base + XDMAC_DADM);
writel(its, xc->reg_ch_base + XDMAC_ITS);
writel(tnum, xc->reg_ch_base + XDMAC_TNUM);
/* enable interrupt */
writel(XDMAC_IEN_ENDIEN | XDMAC_IEN_ERRIEN,
xc->reg_ch_base + XDMAC_IEN);
/* start XDMAC */
val = readl(xc->reg_ch_base + XDMAC_TSS);
val |= XDMAC_TSS_REQ;
writel(val, xc->reg_ch_base + XDMAC_TSS);
}
/* xc->vc.lock must be held by caller */
static int uniphier_xdmac_chan_stop(struct uniphier_xdmac_chan *xc)
{
u32 val;
/* disable interrupt */
val = readl(xc->reg_ch_base + XDMAC_IEN);
val &= ~(XDMAC_IEN_ENDIEN | XDMAC_IEN_ERRIEN);
writel(val, xc->reg_ch_base + XDMAC_IEN);
/* stop XDMAC */
val = readl(xc->reg_ch_base + XDMAC_TSS);
val &= ~XDMAC_TSS_REQ;
writel(0, xc->reg_ch_base + XDMAC_TSS);
/* wait until transfer is stopped */
return readl_poll_timeout_atomic(xc->reg_ch_base + XDMAC_STAT, val,
!(val & XDMAC_STAT_TENF), 100, 1000);
}
/* xc->vc.lock must be held by caller */
static void uniphier_xdmac_start(struct uniphier_xdmac_chan *xc)
{
struct uniphier_xdmac_desc *xd;
xd = uniphier_xdmac_next_desc(xc);
if (xd)
uniphier_xdmac_chan_start(xc, xd);
/* set desc to chan regardless of xd is null */
xc->xd = xd;
}
static void uniphier_xdmac_chan_irq(struct uniphier_xdmac_chan *xc)
{
u32 stat;
int ret;
spin_lock(&xc->vc.lock);
stat = readl(xc->reg_ch_base + XDMAC_ID);
if (stat & XDMAC_ID_ERRIDF) {
ret = uniphier_xdmac_chan_stop(xc);
if (ret)
dev_err(xc->xdev->ddev.dev,
"DMA transfer error with aborting issue\n");
else
dev_err(xc->xdev->ddev.dev,
"DMA transfer error\n");
} else if ((stat & XDMAC_ID_ENDIDF) && xc->xd) {
xc->xd->cur_node++;
if (xc->xd->cur_node >= xc->xd->nr_node) {
vchan_cookie_complete(&xc->xd->vd);
uniphier_xdmac_start(xc);
} else {
uniphier_xdmac_chan_start(xc, xc->xd);
}
}
/* write bits to clear */
writel(stat, xc->reg_ch_base + XDMAC_IR);
spin_unlock(&xc->vc.lock);
}
static irqreturn_t uniphier_xdmac_irq_handler(int irq, void *dev_id)
{
struct uniphier_xdmac_device *xdev = dev_id;
int i;
for (i = 0; i < xdev->nr_chans; i++)
uniphier_xdmac_chan_irq(&xdev->channels[i]);
return IRQ_HANDLED;
}
static void uniphier_xdmac_free_chan_resources(struct dma_chan *chan)
{
vchan_free_chan_resources(to_virt_chan(chan));
}
static struct dma_async_tx_descriptor *
uniphier_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
dma_addr_t src, size_t len, unsigned long flags)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct uniphier_xdmac_desc *xd;
unsigned int nr;
size_t burst_size, tlen;
int i;
if (len > XDMAC_MAX_WORD_SIZE * XDMAC_MAX_WORDS)
return NULL;
nr = 1 + len / XDMAC_MAX_WORD_SIZE;
xd = kzalloc(struct_size(xd, nodes, nr), GFP_NOWAIT);
if (!xd)
return NULL;
for (i = 0; i < nr; i++) {
burst_size = min_t(size_t, len, XDMAC_MAX_WORD_SIZE);
xd->nodes[i].src = src;
xd->nodes[i].dst = dst;
xd->nodes[i].burst_size = burst_size;
xd->nodes[i].nr_burst = len / burst_size;
tlen = rounddown(len, burst_size);
src += tlen;
dst += tlen;
len -= tlen;
}
xd->dir = DMA_MEM_TO_MEM;
xd->nr_node = nr;
xd->cur_node = 0;
return vchan_tx_prep(vc, &xd->vd, flags);
}
static struct dma_async_tx_descriptor *
uniphier_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct uniphier_xdmac_chan *xc = to_uniphier_xdmac_chan(vc);
struct uniphier_xdmac_desc *xd;
struct scatterlist *sg;
enum dma_slave_buswidth buswidth;
u32 maxburst;
int i;
if (!is_slave_direction(direction))
return NULL;
if (direction == DMA_DEV_TO_MEM) {
buswidth = xc->sconfig.src_addr_width;
maxburst = xc->sconfig.src_maxburst;
} else {
buswidth = xc->sconfig.dst_addr_width;
maxburst = xc->sconfig.dst_maxburst;
}
if (!maxburst)
maxburst = 1;
if (maxburst > xc->xdev->ddev.max_burst) {
dev_err(xc->xdev->ddev.dev,
"Exceed maximum number of burst words\n");
return NULL;
}
xd = kzalloc(struct_size(xd, nodes, sg_len), GFP_NOWAIT);
if (!xd)
return NULL;
for_each_sg(sgl, sg, sg_len, i) {
xd->nodes[i].src = (direction == DMA_DEV_TO_MEM)
? xc->sconfig.src_addr : sg_dma_address(sg);
xd->nodes[i].dst = (direction == DMA_MEM_TO_DEV)
? xc->sconfig.dst_addr : sg_dma_address(sg);
xd->nodes[i].burst_size = maxburst * buswidth;
xd->nodes[i].nr_burst =
sg_dma_len(sg) / xd->nodes[i].burst_size;
/*
* Currently transfer that size doesn't align the unit size
* (the number of burst words * bus-width) is not allowed,
* because the driver does not support the way to transfer
* residue size. As a matter of fact, in order to transfer
* arbitrary size, 'src_maxburst' or 'dst_maxburst' of
* dma_slave_config must be 1.
*/
if (sg_dma_len(sg) % xd->nodes[i].burst_size) {
dev_err(xc->xdev->ddev.dev,
"Unaligned transfer size: %d", sg_dma_len(sg));
kfree(xd);
return NULL;
}
if (xd->nodes[i].nr_burst > XDMAC_MAX_WORDS) {
dev_err(xc->xdev->ddev.dev,
"Exceed maximum transfer size");
kfree(xd);
return NULL;
}
}
xd->dir = direction;
xd->nr_node = sg_len;
xd->cur_node = 0;
return vchan_tx_prep(vc, &xd->vd, flags);
}
static int uniphier_xdmac_slave_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct uniphier_xdmac_chan *xc = to_uniphier_xdmac_chan(vc);
memcpy(&xc->sconfig, config, sizeof(*config));
return 0;
}
static int uniphier_xdmac_terminate_all(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct uniphier_xdmac_chan *xc = to_uniphier_xdmac_chan(vc);
unsigned long flags;
int ret = 0;
LIST_HEAD(head);
spin_lock_irqsave(&vc->lock, flags);
if (xc->xd) {
vchan_terminate_vdesc(&xc->xd->vd);
xc->xd = NULL;
ret = uniphier_xdmac_chan_stop(xc);
}
vchan_get_all_descriptors(vc, &head);
spin_unlock_irqrestore(&vc->lock, flags);
vchan_dma_desc_free_list(vc, &head);
return ret;
}
static void uniphier_xdmac_synchronize(struct dma_chan *chan)
{
vchan_synchronize(to_virt_chan(chan));
}
static void uniphier_xdmac_issue_pending(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct uniphier_xdmac_chan *xc = to_uniphier_xdmac_chan(vc);
unsigned long flags;
spin_lock_irqsave(&vc->lock, flags);
if (vchan_issue_pending(vc) && !xc->xd)
uniphier_xdmac_start(xc);
spin_unlock_irqrestore(&vc->lock, flags);
}
static void uniphier_xdmac_desc_free(struct virt_dma_desc *vd)
{
kfree(to_uniphier_xdmac_desc(vd));
}
static void uniphier_xdmac_chan_init(struct uniphier_xdmac_device *xdev,
int ch)
{
struct uniphier_xdmac_chan *xc = &xdev->channels[ch];
xc->xdev = xdev;
xc->reg_ch_base = xdev->reg_base + XDMAC_CH_WIDTH * ch;
xc->vc.desc_free = uniphier_xdmac_desc_free;
vchan_init(&xc->vc, &xdev->ddev);
}
static struct dma_chan *of_dma_uniphier_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct uniphier_xdmac_device *xdev = ofdma->of_dma_data;
int chan_id = dma_spec->args[0];
if (chan_id >= xdev->nr_chans)
return NULL;
xdev->channels[chan_id].id = chan_id;
xdev->channels[chan_id].req_factor = dma_spec->args[1];
return dma_get_slave_channel(&xdev->channels[chan_id].vc.chan);
}
static int uniphier_xdmac_probe(struct platform_device *pdev)
{
struct uniphier_xdmac_device *xdev;
struct device *dev = &pdev->dev;
struct dma_device *ddev;
int irq;
int nr_chans;
int i, ret;
if (of_property_read_u32(dev->of_node, "dma-channels", &nr_chans))
return -EINVAL;
if (nr_chans > XDMAC_MAX_CHANS)
nr_chans = XDMAC_MAX_CHANS;
xdev = devm_kzalloc(dev, struct_size(xdev, channels, nr_chans),
GFP_KERNEL);
if (!xdev)
return -ENOMEM;
xdev->nr_chans = nr_chans;
xdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(xdev->reg_base))
return PTR_ERR(xdev->reg_base);
ddev = &xdev->ddev;
ddev->dev = dev;
dma_cap_zero(ddev->cap_mask);
dma_cap_set(DMA_MEMCPY, ddev->cap_mask);
dma_cap_set(DMA_SLAVE, ddev->cap_mask);
ddev->src_addr_widths = UNIPHIER_XDMAC_BUSWIDTHS;
ddev->dst_addr_widths = UNIPHIER_XDMAC_BUSWIDTHS;
ddev->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
BIT(DMA_MEM_TO_MEM);
ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
ddev->max_burst = XDMAC_MAX_WORDS;
ddev->device_free_chan_resources = uniphier_xdmac_free_chan_resources;
ddev->device_prep_dma_memcpy = uniphier_xdmac_prep_dma_memcpy;
ddev->device_prep_slave_sg = uniphier_xdmac_prep_slave_sg;
ddev->device_config = uniphier_xdmac_slave_config;
ddev->device_terminate_all = uniphier_xdmac_terminate_all;
ddev->device_synchronize = uniphier_xdmac_synchronize;
ddev->device_tx_status = dma_cookie_status;
ddev->device_issue_pending = uniphier_xdmac_issue_pending;
INIT_LIST_HEAD(&ddev->channels);
for (i = 0; i < nr_chans; i++)
uniphier_xdmac_chan_init(xdev, i);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
ret = devm_request_irq(dev, irq, uniphier_xdmac_irq_handler,
IRQF_SHARED, "xdmac", xdev);
if (ret) {
dev_err(dev, "Failed to request IRQ\n");
return ret;
}
ret = dma_async_device_register(ddev);
if (ret) {
dev_err(dev, "Failed to register XDMA device\n");
return ret;
}
ret = of_dma_controller_register(dev->of_node,
of_dma_uniphier_xlate, xdev);
if (ret) {
dev_err(dev, "Failed to register XDMA controller\n");
goto out_unregister_dmac;
}
platform_set_drvdata(pdev, xdev);
dev_info(&pdev->dev, "UniPhier XDMAC driver (%d channels)\n",
nr_chans);
return 0;
out_unregister_dmac:
dma_async_device_unregister(ddev);
return ret;
}
static int uniphier_xdmac_remove(struct platform_device *pdev)
{
struct uniphier_xdmac_device *xdev = platform_get_drvdata(pdev);
struct dma_device *ddev = &xdev->ddev;
struct dma_chan *chan;
int ret;
/*
* Before reaching here, almost all descriptors have been freed by the
* ->device_free_chan_resources() hook. However, each channel might
* be still holding one descriptor that was on-flight at that moment.
* Terminate it to make sure this hardware is no longer running. Then,
* free the channel resources once again to avoid memory leak.
*/
list_for_each_entry(chan, &ddev->channels, device_node) {
ret = dmaengine_terminate_sync(chan);
if (ret)
return ret;
uniphier_xdmac_free_chan_resources(chan);
}
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(ddev);
return 0;
}
static const struct of_device_id uniphier_xdmac_match[] = {
{ .compatible = "socionext,uniphier-xdmac" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, uniphier_xdmac_match);
static struct platform_driver uniphier_xdmac_driver = {
.probe = uniphier_xdmac_probe,
.remove = uniphier_xdmac_remove,
.driver = {
.name = "uniphier-xdmac",
.of_match_table = uniphier_xdmac_match,
},
};
module_platform_driver(uniphier_xdmac_driver);
MODULE_AUTHOR("Kunihiko Hayashi <[email protected]>");
MODULE_DESCRIPTION("UniPhier external DMA controller driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/uniphier-xdmac.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Copyright (C) STMicroelectronics SA 2017
* Author(s): M'boumba Cedric Madianga <[email protected]>
* Pierre-Yves Mordret <[email protected]>
*
* DMA Router driver for STM32 DMA MUX
*
* Based on TI DMA Crossbar driver
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#define STM32_DMAMUX_CCR(x) (0x4 * (x))
#define STM32_DMAMUX_MAX_DMA_REQUESTS 32
#define STM32_DMAMUX_MAX_REQUESTS 255
struct stm32_dmamux {
u32 master;
u32 request;
u32 chan_id;
};
struct stm32_dmamux_data {
struct dma_router dmarouter;
struct clk *clk;
void __iomem *iomem;
u32 dma_requests; /* Number of DMA requests connected to DMAMUX */
u32 dmamux_requests; /* Number of DMA requests routed toward DMAs */
spinlock_t lock; /* Protects register access */
DECLARE_BITMAP(dma_inuse, STM32_DMAMUX_MAX_DMA_REQUESTS); /* Used DMA channel */
u32 ccr[STM32_DMAMUX_MAX_DMA_REQUESTS]; /* Used to backup CCR register
* in suspend
*/
u32 dma_reqs[]; /* Number of DMA Request per DMA masters.
* [0] holds number of DMA Masters.
* To be kept at very end of this structure
*/
};
static inline u32 stm32_dmamux_read(void __iomem *iomem, u32 reg)
{
return readl_relaxed(iomem + reg);
}
static inline void stm32_dmamux_write(void __iomem *iomem, u32 reg, u32 val)
{
writel_relaxed(val, iomem + reg);
}
static void stm32_dmamux_free(struct device *dev, void *route_data)
{
struct stm32_dmamux_data *dmamux = dev_get_drvdata(dev);
struct stm32_dmamux *mux = route_data;
unsigned long flags;
/* Clear dma request */
spin_lock_irqsave(&dmamux->lock, flags);
stm32_dmamux_write(dmamux->iomem, STM32_DMAMUX_CCR(mux->chan_id), 0);
clear_bit(mux->chan_id, dmamux->dma_inuse);
pm_runtime_put_sync(dev);
spin_unlock_irqrestore(&dmamux->lock, flags);
dev_dbg(dev, "Unmapping DMAMUX(%u) to DMA%u(%u)\n",
mux->request, mux->master, mux->chan_id);
kfree(mux);
}
static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
struct stm32_dmamux_data *dmamux = platform_get_drvdata(pdev);
struct stm32_dmamux *mux;
u32 i, min, max;
int ret;
unsigned long flags;
if (dma_spec->args_count != 3) {
dev_err(&pdev->dev, "invalid number of dma mux args\n");
return ERR_PTR(-EINVAL);
}
if (dma_spec->args[0] > dmamux->dmamux_requests) {
dev_err(&pdev->dev, "invalid mux request number: %d\n",
dma_spec->args[0]);
return ERR_PTR(-EINVAL);
}
mux = kzalloc(sizeof(*mux), GFP_KERNEL);
if (!mux)
return ERR_PTR(-ENOMEM);
spin_lock_irqsave(&dmamux->lock, flags);
mux->chan_id = find_first_zero_bit(dmamux->dma_inuse,
dmamux->dma_requests);
if (mux->chan_id == dmamux->dma_requests) {
spin_unlock_irqrestore(&dmamux->lock, flags);
dev_err(&pdev->dev, "Run out of free DMA requests\n");
ret = -ENOMEM;
goto error_chan_id;
}
set_bit(mux->chan_id, dmamux->dma_inuse);
spin_unlock_irqrestore(&dmamux->lock, flags);
/* Look for DMA Master */
for (i = 1, min = 0, max = dmamux->dma_reqs[i];
i <= dmamux->dma_reqs[0];
min += dmamux->dma_reqs[i], max += dmamux->dma_reqs[++i])
if (mux->chan_id < max)
break;
mux->master = i - 1;
/* The of_node_put() will be done in of_dma_router_xlate function */
dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", i - 1);
if (!dma_spec->np) {
dev_err(&pdev->dev, "can't get dma master\n");
ret = -EINVAL;
goto error;
}
/* Set dma request */
spin_lock_irqsave(&dmamux->lock, flags);
ret = pm_runtime_resume_and_get(&pdev->dev);
if (ret < 0) {
spin_unlock_irqrestore(&dmamux->lock, flags);
goto error;
}
spin_unlock_irqrestore(&dmamux->lock, flags);
mux->request = dma_spec->args[0];
/* craft DMA spec */
dma_spec->args[3] = dma_spec->args[2] | mux->chan_id << 16;
dma_spec->args[2] = dma_spec->args[1];
dma_spec->args[1] = 0;
dma_spec->args[0] = mux->chan_id - min;
dma_spec->args_count = 4;
stm32_dmamux_write(dmamux->iomem, STM32_DMAMUX_CCR(mux->chan_id),
mux->request);
dev_dbg(&pdev->dev, "Mapping DMAMUX(%u) to DMA%u(%u)\n",
mux->request, mux->master, mux->chan_id);
return mux;
error:
clear_bit(mux->chan_id, dmamux->dma_inuse);
error_chan_id:
kfree(mux);
return ERR_PTR(ret);
}
static const struct of_device_id stm32_stm32dma_master_match[] __maybe_unused = {
{ .compatible = "st,stm32-dma", },
{},
};
static int stm32_dmamux_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
const struct of_device_id *match;
struct device_node *dma_node;
struct stm32_dmamux_data *stm32_dmamux;
void __iomem *iomem;
struct reset_control *rst;
int i, count, ret;
u32 dma_req;
if (!node)
return -ENODEV;
count = device_property_count_u32(&pdev->dev, "dma-masters");
if (count < 0) {
dev_err(&pdev->dev, "Can't get DMA master(s) node\n");
return -ENODEV;
}
stm32_dmamux = devm_kzalloc(&pdev->dev, sizeof(*stm32_dmamux) +
sizeof(u32) * (count + 1), GFP_KERNEL);
if (!stm32_dmamux)
return -ENOMEM;
dma_req = 0;
for (i = 1; i <= count; i++) {
dma_node = of_parse_phandle(node, "dma-masters", i - 1);
match = of_match_node(stm32_stm32dma_master_match, dma_node);
if (!match) {
dev_err(&pdev->dev, "DMA master is not supported\n");
of_node_put(dma_node);
return -EINVAL;
}
if (of_property_read_u32(dma_node, "dma-requests",
&stm32_dmamux->dma_reqs[i])) {
dev_info(&pdev->dev,
"Missing MUX output information, using %u.\n",
STM32_DMAMUX_MAX_DMA_REQUESTS);
stm32_dmamux->dma_reqs[i] =
STM32_DMAMUX_MAX_DMA_REQUESTS;
}
dma_req += stm32_dmamux->dma_reqs[i];
of_node_put(dma_node);
}
if (dma_req > STM32_DMAMUX_MAX_DMA_REQUESTS) {
dev_err(&pdev->dev, "Too many DMA Master Requests to manage\n");
return -ENODEV;
}
stm32_dmamux->dma_requests = dma_req;
stm32_dmamux->dma_reqs[0] = count;
if (device_property_read_u32(&pdev->dev, "dma-requests",
&stm32_dmamux->dmamux_requests)) {
stm32_dmamux->dmamux_requests = STM32_DMAMUX_MAX_REQUESTS;
dev_warn(&pdev->dev, "DMAMUX defaulting on %u requests\n",
stm32_dmamux->dmamux_requests);
}
pm_runtime_get_noresume(&pdev->dev);
iomem = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(iomem))
return PTR_ERR(iomem);
spin_lock_init(&stm32_dmamux->lock);
stm32_dmamux->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(stm32_dmamux->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(stm32_dmamux->clk),
"Missing clock controller\n");
ret = clk_prepare_enable(stm32_dmamux->clk);
if (ret < 0) {
dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret);
return ret;
}
rst = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(rst)) {
ret = PTR_ERR(rst);
if (ret == -EPROBE_DEFER)
goto err_clk;
} else if (count > 1) { /* Don't reset if there is only one dma-master */
reset_control_assert(rst);
udelay(2);
reset_control_deassert(rst);
}
stm32_dmamux->iomem = iomem;
stm32_dmamux->dmarouter.dev = &pdev->dev;
stm32_dmamux->dmarouter.route_free = stm32_dmamux_free;
platform_set_drvdata(pdev, stm32_dmamux);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
/* Reset the dmamux */
for (i = 0; i < stm32_dmamux->dma_requests; i++)
stm32_dmamux_write(stm32_dmamux->iomem, STM32_DMAMUX_CCR(i), 0);
pm_runtime_put(&pdev->dev);
ret = of_dma_router_register(node, stm32_dmamux_route_allocate,
&stm32_dmamux->dmarouter);
if (ret)
goto pm_disable;
return 0;
pm_disable:
pm_runtime_disable(&pdev->dev);
err_clk:
clk_disable_unprepare(stm32_dmamux->clk);
return ret;
}
#ifdef CONFIG_PM
static int stm32_dmamux_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
clk_disable_unprepare(stm32_dmamux->clk);
return 0;
}
static int stm32_dmamux_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
int ret;
ret = clk_prepare_enable(stm32_dmamux->clk);
if (ret) {
dev_err(&pdev->dev, "failed to prepare_enable clock\n");
return ret;
}
return 0;
}
#endif
#ifdef CONFIG_PM_SLEEP
static int stm32_dmamux_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
int i, ret;
ret = pm_runtime_resume_and_get(dev);
if (ret < 0)
return ret;
for (i = 0; i < stm32_dmamux->dma_requests; i++)
stm32_dmamux->ccr[i] = stm32_dmamux_read(stm32_dmamux->iomem,
STM32_DMAMUX_CCR(i));
pm_runtime_put_sync(dev);
pm_runtime_force_suspend(dev);
return 0;
}
static int stm32_dmamux_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
int i, ret;
ret = pm_runtime_force_resume(dev);
if (ret < 0)
return ret;
ret = pm_runtime_resume_and_get(dev);
if (ret < 0)
return ret;
for (i = 0; i < stm32_dmamux->dma_requests; i++)
stm32_dmamux_write(stm32_dmamux->iomem, STM32_DMAMUX_CCR(i),
stm32_dmamux->ccr[i]);
pm_runtime_put_sync(dev);
return 0;
}
#endif
static const struct dev_pm_ops stm32_dmamux_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(stm32_dmamux_suspend, stm32_dmamux_resume)
SET_RUNTIME_PM_OPS(stm32_dmamux_runtime_suspend,
stm32_dmamux_runtime_resume, NULL)
};
static const struct of_device_id stm32_dmamux_match[] = {
{ .compatible = "st,stm32h7-dmamux" },
{},
};
static struct platform_driver stm32_dmamux_driver = {
.probe = stm32_dmamux_probe,
.driver = {
.name = "stm32-dmamux",
.of_match_table = stm32_dmamux_match,
.pm = &stm32_dmamux_pm_ops,
},
};
static int __init stm32_dmamux_init(void)
{
return platform_driver_register(&stm32_dmamux_driver);
}
arch_initcall(stm32_dmamux_init);
MODULE_DESCRIPTION("DMA Router driver for STM32 DMA MUX");
MODULE_AUTHOR("M'boumba Cedric Madianga <[email protected]>");
MODULE_AUTHOR("Pierre-Yves Mordret <[email protected]>");
| linux-master | drivers/dma/stm32-dmamux.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver For Marvell Two-channel DMA Engine
*
* Copyright: Marvell International Ltd.
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/dmaengine.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/genalloc.h>
#include <linux/of_device.h>
#include <linux/of_dma.h>
#include "dmaengine.h"
/*
* Two-Channel DMA registers
*/
#define TDBCR 0x00 /* Byte Count */
#define TDSAR 0x10 /* Src Addr */
#define TDDAR 0x20 /* Dst Addr */
#define TDNDPR 0x30 /* Next Desc */
#define TDCR 0x40 /* Control */
#define TDCP 0x60 /* Priority*/
#define TDCDPR 0x70 /* Current Desc */
#define TDIMR 0x80 /* Int Mask */
#define TDISR 0xa0 /* Int Status */
/* Two-Channel DMA Control Register */
#define TDCR_SSZ_8_BITS (0x0 << 22) /* Sample Size */
#define TDCR_SSZ_12_BITS (0x1 << 22)
#define TDCR_SSZ_16_BITS (0x2 << 22)
#define TDCR_SSZ_20_BITS (0x3 << 22)
#define TDCR_SSZ_24_BITS (0x4 << 22)
#define TDCR_SSZ_32_BITS (0x5 << 22)
#define TDCR_SSZ_SHIFT (0x1 << 22)
#define TDCR_SSZ_MASK (0x7 << 22)
#define TDCR_SSPMOD (0x1 << 21) /* SSP MOD */
#define TDCR_ABR (0x1 << 20) /* Channel Abort */
#define TDCR_CDE (0x1 << 17) /* Close Desc Enable */
#define TDCR_PACKMOD (0x1 << 16) /* Pack Mode (ADMA Only) */
#define TDCR_CHANACT (0x1 << 14) /* Channel Active */
#define TDCR_FETCHND (0x1 << 13) /* Fetch Next Desc */
#define TDCR_CHANEN (0x1 << 12) /* Channel Enable */
#define TDCR_INTMODE (0x1 << 10) /* Interrupt Mode */
#define TDCR_CHAINMOD (0x1 << 9) /* Chain Mode */
#define TDCR_BURSTSZ_MSK (0x7 << 6) /* Burst Size */
#define TDCR_BURSTSZ_4B (0x0 << 6)
#define TDCR_BURSTSZ_8B (0x1 << 6)
#define TDCR_BURSTSZ_16B (0x3 << 6)
#define TDCR_BURSTSZ_32B (0x6 << 6)
#define TDCR_BURSTSZ_64B (0x7 << 6)
#define TDCR_BURSTSZ_SQU_1B (0x5 << 6)
#define TDCR_BURSTSZ_SQU_2B (0x6 << 6)
#define TDCR_BURSTSZ_SQU_4B (0x0 << 6)
#define TDCR_BURSTSZ_SQU_8B (0x1 << 6)
#define TDCR_BURSTSZ_SQU_16B (0x3 << 6)
#define TDCR_BURSTSZ_SQU_32B (0x7 << 6)
#define TDCR_BURSTSZ_128B (0x5 << 6)
#define TDCR_DSTDIR_MSK (0x3 << 4) /* Dst Direction */
#define TDCR_DSTDIR_ADDR_HOLD (0x2 << 4) /* Dst Addr Hold */
#define TDCR_DSTDIR_ADDR_INC (0x0 << 4) /* Dst Addr Increment */
#define TDCR_SRCDIR_MSK (0x3 << 2) /* Src Direction */
#define TDCR_SRCDIR_ADDR_HOLD (0x2 << 2) /* Src Addr Hold */
#define TDCR_SRCDIR_ADDR_INC (0x0 << 2) /* Src Addr Increment */
#define TDCR_DSTDESCCONT (0x1 << 1)
#define TDCR_SRCDESTCONT (0x1 << 0)
/* Two-Channel DMA Int Mask Register */
#define TDIMR_COMP (0x1 << 0)
/* Two-Channel DMA Int Status Register */
#define TDISR_COMP (0x1 << 0)
/*
* Two-Channel DMA Descriptor Struct
* NOTE: desc's buf must be aligned to 16 bytes.
*/
struct mmp_tdma_desc {
u32 byte_cnt;
u32 src_addr;
u32 dst_addr;
u32 nxt_desc;
};
enum mmp_tdma_type {
MMP_AUD_TDMA = 0,
PXA910_SQU,
};
#define TDMA_MAX_XFER_BYTES SZ_64K
struct mmp_tdma_chan {
struct device *dev;
struct dma_chan chan;
struct dma_async_tx_descriptor desc;
struct tasklet_struct tasklet;
struct mmp_tdma_desc *desc_arr;
dma_addr_t desc_arr_phys;
int desc_num;
enum dma_transfer_direction dir;
dma_addr_t dev_addr;
u32 burst_sz;
enum dma_slave_buswidth buswidth;
enum dma_status status;
struct dma_slave_config slave_config;
int idx;
enum mmp_tdma_type type;
int irq;
void __iomem *reg_base;
size_t buf_len;
size_t period_len;
size_t pos;
struct gen_pool *pool;
};
#define TDMA_CHANNEL_NUM 2
struct mmp_tdma_device {
struct device *dev;
void __iomem *base;
struct dma_device device;
struct mmp_tdma_chan *tdmac[TDMA_CHANNEL_NUM];
};
#define to_mmp_tdma_chan(dchan) container_of(dchan, struct mmp_tdma_chan, chan)
static int mmp_tdma_config_write(struct dma_chan *chan,
enum dma_transfer_direction dir,
struct dma_slave_config *dmaengine_cfg);
static void mmp_tdma_chan_set_desc(struct mmp_tdma_chan *tdmac, dma_addr_t phys)
{
writel(phys, tdmac->reg_base + TDNDPR);
writel(readl(tdmac->reg_base + TDCR) | TDCR_FETCHND,
tdmac->reg_base + TDCR);
}
static void mmp_tdma_enable_irq(struct mmp_tdma_chan *tdmac, bool enable)
{
if (enable)
writel(TDIMR_COMP, tdmac->reg_base + TDIMR);
else
writel(0, tdmac->reg_base + TDIMR);
}
static void mmp_tdma_enable_chan(struct mmp_tdma_chan *tdmac)
{
/* enable dma chan */
writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
tdmac->reg_base + TDCR);
tdmac->status = DMA_IN_PROGRESS;
}
static int mmp_tdma_disable_chan(struct dma_chan *chan)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
u32 tdcr;
tdcr = readl(tdmac->reg_base + TDCR);
tdcr |= TDCR_ABR;
tdcr &= ~TDCR_CHANEN;
writel(tdcr, tdmac->reg_base + TDCR);
tdmac->status = DMA_COMPLETE;
return 0;
}
static int mmp_tdma_resume_chan(struct dma_chan *chan)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
tdmac->reg_base + TDCR);
tdmac->status = DMA_IN_PROGRESS;
return 0;
}
static int mmp_tdma_pause_chan(struct dma_chan *chan)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN,
tdmac->reg_base + TDCR);
tdmac->status = DMA_PAUSED;
return 0;
}
static int mmp_tdma_config_chan(struct dma_chan *chan)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
unsigned int tdcr = 0;
mmp_tdma_disable_chan(chan);
if (tdmac->dir == DMA_MEM_TO_DEV)
tdcr = TDCR_DSTDIR_ADDR_HOLD | TDCR_SRCDIR_ADDR_INC;
else if (tdmac->dir == DMA_DEV_TO_MEM)
tdcr = TDCR_SRCDIR_ADDR_HOLD | TDCR_DSTDIR_ADDR_INC;
if (tdmac->type == MMP_AUD_TDMA) {
tdcr |= TDCR_PACKMOD;
switch (tdmac->burst_sz) {
case 4:
tdcr |= TDCR_BURSTSZ_4B;
break;
case 8:
tdcr |= TDCR_BURSTSZ_8B;
break;
case 16:
tdcr |= TDCR_BURSTSZ_16B;
break;
case 32:
tdcr |= TDCR_BURSTSZ_32B;
break;
case 64:
tdcr |= TDCR_BURSTSZ_64B;
break;
case 128:
tdcr |= TDCR_BURSTSZ_128B;
break;
default:
dev_err(tdmac->dev, "unknown burst size.\n");
return -EINVAL;
}
switch (tdmac->buswidth) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
tdcr |= TDCR_SSZ_8_BITS;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
tdcr |= TDCR_SSZ_16_BITS;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
tdcr |= TDCR_SSZ_32_BITS;
break;
default:
dev_err(tdmac->dev, "unknown bus size.\n");
return -EINVAL;
}
} else if (tdmac->type == PXA910_SQU) {
tdcr |= TDCR_SSPMOD;
switch (tdmac->burst_sz) {
case 1:
tdcr |= TDCR_BURSTSZ_SQU_1B;
break;
case 2:
tdcr |= TDCR_BURSTSZ_SQU_2B;
break;
case 4:
tdcr |= TDCR_BURSTSZ_SQU_4B;
break;
case 8:
tdcr |= TDCR_BURSTSZ_SQU_8B;
break;
case 16:
tdcr |= TDCR_BURSTSZ_SQU_16B;
break;
case 32:
tdcr |= TDCR_BURSTSZ_SQU_32B;
break;
default:
dev_err(tdmac->dev, "unknown burst size.\n");
return -EINVAL;
}
}
writel(tdcr, tdmac->reg_base + TDCR);
return 0;
}
static int mmp_tdma_clear_chan_irq(struct mmp_tdma_chan *tdmac)
{
u32 reg = readl(tdmac->reg_base + TDISR);
if (reg & TDISR_COMP) {
/* clear irq */
reg &= ~TDISR_COMP;
writel(reg, tdmac->reg_base + TDISR);
return 0;
}
return -EAGAIN;
}
static size_t mmp_tdma_get_pos(struct mmp_tdma_chan *tdmac)
{
size_t reg;
if (tdmac->idx == 0) {
reg = __raw_readl(tdmac->reg_base + TDSAR);
reg -= tdmac->desc_arr[0].src_addr;
} else if (tdmac->idx == 1) {
reg = __raw_readl(tdmac->reg_base + TDDAR);
reg -= tdmac->desc_arr[0].dst_addr;
} else
return -EINVAL;
return reg;
}
static irqreturn_t mmp_tdma_chan_handler(int irq, void *dev_id)
{
struct mmp_tdma_chan *tdmac = dev_id;
if (mmp_tdma_clear_chan_irq(tdmac) == 0) {
tasklet_schedule(&tdmac->tasklet);
return IRQ_HANDLED;
} else
return IRQ_NONE;
}
static irqreturn_t mmp_tdma_int_handler(int irq, void *dev_id)
{
struct mmp_tdma_device *tdev = dev_id;
int i, ret;
int irq_num = 0;
for (i = 0; i < TDMA_CHANNEL_NUM; i++) {
struct mmp_tdma_chan *tdmac = tdev->tdmac[i];
ret = mmp_tdma_chan_handler(irq, tdmac);
if (ret == IRQ_HANDLED)
irq_num++;
}
if (irq_num)
return IRQ_HANDLED;
else
return IRQ_NONE;
}
static void dma_do_tasklet(struct tasklet_struct *t)
{
struct mmp_tdma_chan *tdmac = from_tasklet(tdmac, t, tasklet);
dmaengine_desc_get_callback_invoke(&tdmac->desc, NULL);
}
static void mmp_tdma_free_descriptor(struct mmp_tdma_chan *tdmac)
{
struct gen_pool *gpool;
int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
gpool = tdmac->pool;
if (gpool && tdmac->desc_arr)
gen_pool_free(gpool, (unsigned long)tdmac->desc_arr,
size);
tdmac->desc_arr = NULL;
if (tdmac->status == DMA_ERROR)
tdmac->status = DMA_COMPLETE;
return;
}
static dma_cookie_t mmp_tdma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(tx->chan);
mmp_tdma_chan_set_desc(tdmac, tdmac->desc_arr_phys);
return 0;
}
static int mmp_tdma_alloc_chan_resources(struct dma_chan *chan)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
int ret;
dma_async_tx_descriptor_init(&tdmac->desc, chan);
tdmac->desc.tx_submit = mmp_tdma_tx_submit;
if (tdmac->irq) {
ret = devm_request_irq(tdmac->dev, tdmac->irq,
mmp_tdma_chan_handler, 0, "tdma", tdmac);
if (ret)
return ret;
}
return 1;
}
static void mmp_tdma_free_chan_resources(struct dma_chan *chan)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
if (tdmac->irq)
devm_free_irq(tdmac->dev, tdmac->irq, tdmac);
mmp_tdma_free_descriptor(tdmac);
return;
}
static struct mmp_tdma_desc *mmp_tdma_alloc_descriptor(struct mmp_tdma_chan *tdmac)
{
struct gen_pool *gpool;
int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
gpool = tdmac->pool;
if (!gpool)
return NULL;
tdmac->desc_arr = gen_pool_dma_alloc(gpool, size, &tdmac->desc_arr_phys);
return tdmac->desc_arr;
}
static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
struct mmp_tdma_desc *desc;
int num_periods = buf_len / period_len;
int i = 0, buf = 0;
if (!is_slave_direction(direction)) {
dev_err(tdmac->dev, "unsupported transfer direction\n");
return NULL;
}
if (tdmac->status != DMA_COMPLETE) {
dev_err(tdmac->dev, "controller busy");
return NULL;
}
if (period_len > TDMA_MAX_XFER_BYTES) {
dev_err(tdmac->dev,
"maximum period size exceeded: %zu > %d\n",
period_len, TDMA_MAX_XFER_BYTES);
goto err_out;
}
tdmac->status = DMA_IN_PROGRESS;
tdmac->desc_num = num_periods;
desc = mmp_tdma_alloc_descriptor(tdmac);
if (!desc)
goto err_out;
if (mmp_tdma_config_write(chan, direction, &tdmac->slave_config))
goto err_out;
while (buf < buf_len) {
desc = &tdmac->desc_arr[i];
if (i + 1 == num_periods)
desc->nxt_desc = tdmac->desc_arr_phys;
else
desc->nxt_desc = tdmac->desc_arr_phys +
sizeof(*desc) * (i + 1);
if (direction == DMA_MEM_TO_DEV) {
desc->src_addr = dma_addr;
desc->dst_addr = tdmac->dev_addr;
} else {
desc->src_addr = tdmac->dev_addr;
desc->dst_addr = dma_addr;
}
desc->byte_cnt = period_len;
dma_addr += period_len;
buf += period_len;
i++;
}
/* enable interrupt */
if (flags & DMA_PREP_INTERRUPT)
mmp_tdma_enable_irq(tdmac, true);
tdmac->buf_len = buf_len;
tdmac->period_len = period_len;
tdmac->pos = 0;
return &tdmac->desc;
err_out:
tdmac->status = DMA_ERROR;
return NULL;
}
static int mmp_tdma_terminate_all(struct dma_chan *chan)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
mmp_tdma_disable_chan(chan);
/* disable interrupt */
mmp_tdma_enable_irq(tdmac, false);
return 0;
}
static int mmp_tdma_config(struct dma_chan *chan,
struct dma_slave_config *dmaengine_cfg)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
memcpy(&tdmac->slave_config, dmaengine_cfg, sizeof(*dmaengine_cfg));
return 0;
}
static int mmp_tdma_config_write(struct dma_chan *chan,
enum dma_transfer_direction dir,
struct dma_slave_config *dmaengine_cfg)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
if (dir == DMA_DEV_TO_MEM) {
tdmac->dev_addr = dmaengine_cfg->src_addr;
tdmac->burst_sz = dmaengine_cfg->src_maxburst;
tdmac->buswidth = dmaengine_cfg->src_addr_width;
} else {
tdmac->dev_addr = dmaengine_cfg->dst_addr;
tdmac->burst_sz = dmaengine_cfg->dst_maxburst;
tdmac->buswidth = dmaengine_cfg->dst_addr_width;
}
tdmac->dir = dir;
return mmp_tdma_config_chan(chan);
}
static enum dma_status mmp_tdma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
tdmac->pos = mmp_tdma_get_pos(tdmac);
dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie,
tdmac->buf_len - tdmac->pos);
return tdmac->status;
}
static void mmp_tdma_issue_pending(struct dma_chan *chan)
{
struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
mmp_tdma_enable_chan(tdmac);
}
static int mmp_tdma_remove(struct platform_device *pdev)
{
if (pdev->dev.of_node)
of_dma_controller_free(pdev->dev.of_node);
return 0;
}
static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
int idx, int irq,
int type, struct gen_pool *pool)
{
struct mmp_tdma_chan *tdmac;
if (idx >= TDMA_CHANNEL_NUM) {
dev_err(tdev->dev, "too many channels for device!\n");
return -EINVAL;
}
/* alloc channel */
tdmac = devm_kzalloc(tdev->dev, sizeof(*tdmac), GFP_KERNEL);
if (!tdmac)
return -ENOMEM;
if (irq)
tdmac->irq = irq;
tdmac->dev = tdev->dev;
tdmac->chan.device = &tdev->device;
tdmac->idx = idx;
tdmac->type = type;
tdmac->reg_base = tdev->base + idx * 4;
tdmac->pool = pool;
tdmac->status = DMA_COMPLETE;
tdev->tdmac[tdmac->idx] = tdmac;
tasklet_setup(&tdmac->tasklet, dma_do_tasklet);
/* add the channel to tdma_chan list */
list_add_tail(&tdmac->chan.device_node,
&tdev->device.channels);
return 0;
}
struct mmp_tdma_filter_param {
unsigned int chan_id;
};
static bool mmp_tdma_filter_fn(struct dma_chan *chan, void *fn_param)
{
struct mmp_tdma_filter_param *param = fn_param;
if (chan->chan_id != param->chan_id)
return false;
return true;
}
static struct dma_chan *mmp_tdma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct mmp_tdma_device *tdev = ofdma->of_dma_data;
dma_cap_mask_t mask = tdev->device.cap_mask;
struct mmp_tdma_filter_param param;
if (dma_spec->args_count != 1)
return NULL;
param.chan_id = dma_spec->args[0];
if (param.chan_id >= TDMA_CHANNEL_NUM)
return NULL;
return __dma_request_channel(&mask, mmp_tdma_filter_fn, ¶m,
ofdma->of_node);
}
static const struct of_device_id mmp_tdma_dt_ids[] = {
{ .compatible = "marvell,adma-1.0", .data = (void *)MMP_AUD_TDMA},
{ .compatible = "marvell,pxa910-squ", .data = (void *)PXA910_SQU},
{}
};
MODULE_DEVICE_TABLE(of, mmp_tdma_dt_ids);
static int mmp_tdma_probe(struct platform_device *pdev)
{
enum mmp_tdma_type type;
const struct of_device_id *of_id;
struct mmp_tdma_device *tdev;
int i, ret;
int irq = 0, irq_num = 0;
int chan_num = TDMA_CHANNEL_NUM;
struct gen_pool *pool = NULL;
of_id = of_match_device(mmp_tdma_dt_ids, &pdev->dev);
if (of_id)
type = (enum mmp_tdma_type) of_id->data;
else
type = platform_get_device_id(pdev)->driver_data;
/* always have couple channels */
tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
if (!tdev)
return -ENOMEM;
tdev->dev = &pdev->dev;
for (i = 0; i < chan_num; i++) {
if (platform_get_irq(pdev, i) > 0)
irq_num++;
}
tdev->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(tdev->base))
return PTR_ERR(tdev->base);
INIT_LIST_HEAD(&tdev->device.channels);
pool = of_gen_pool_get(pdev->dev.of_node, "asram", 0);
if (!pool) {
dev_err(&pdev->dev, "asram pool not available\n");
return -ENOMEM;
}
if (irq_num != chan_num) {
irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(&pdev->dev, irq,
mmp_tdma_int_handler, IRQF_SHARED, "tdma", tdev);
if (ret)
return ret;
}
/* initialize channel parameters */
for (i = 0; i < chan_num; i++) {
irq = (irq_num != chan_num) ? 0 : platform_get_irq(pdev, i);
ret = mmp_tdma_chan_init(tdev, i, irq, type, pool);
if (ret)
return ret;
}
dma_cap_set(DMA_SLAVE, tdev->device.cap_mask);
dma_cap_set(DMA_CYCLIC, tdev->device.cap_mask);
tdev->device.dev = &pdev->dev;
tdev->device.device_alloc_chan_resources =
mmp_tdma_alloc_chan_resources;
tdev->device.device_free_chan_resources =
mmp_tdma_free_chan_resources;
tdev->device.device_prep_dma_cyclic = mmp_tdma_prep_dma_cyclic;
tdev->device.device_tx_status = mmp_tdma_tx_status;
tdev->device.device_issue_pending = mmp_tdma_issue_pending;
tdev->device.device_config = mmp_tdma_config;
tdev->device.device_pause = mmp_tdma_pause_chan;
tdev->device.device_resume = mmp_tdma_resume_chan;
tdev->device.device_terminate_all = mmp_tdma_terminate_all;
tdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
tdev->device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
if (type == MMP_AUD_TDMA) {
tdev->device.max_burst = SZ_128;
tdev->device.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
tdev->device.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
} else if (type == PXA910_SQU) {
tdev->device.max_burst = SZ_32;
}
tdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
tdev->device.descriptor_reuse = true;
dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
platform_set_drvdata(pdev, tdev);
ret = dmaenginem_async_device_register(&tdev->device);
if (ret) {
dev_err(tdev->device.dev, "unable to register\n");
return ret;
}
if (pdev->dev.of_node) {
ret = of_dma_controller_register(pdev->dev.of_node,
mmp_tdma_xlate, tdev);
if (ret) {
dev_err(tdev->device.dev,
"failed to register controller\n");
return ret;
}
}
dev_info(tdev->device.dev, "initialized\n");
return 0;
}
static const struct platform_device_id mmp_tdma_id_table[] = {
{ "mmp-adma", MMP_AUD_TDMA },
{ "pxa910-squ", PXA910_SQU },
{ },
};
static struct platform_driver mmp_tdma_driver = {
.driver = {
.name = "mmp-tdma",
.of_match_table = mmp_tdma_dt_ids,
},
.id_table = mmp_tdma_id_table,
.probe = mmp_tdma_probe,
.remove = mmp_tdma_remove,
};
module_platform_driver(mmp_tdma_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MMP Two-Channel DMA Driver");
MODULE_ALIAS("platform:mmp-tdma");
MODULE_AUTHOR("Leo Yan <[email protected]>");
MODULE_AUTHOR("Zhangfei Gao <[email protected]>");
| linux-master | drivers/dma/mmp_tdma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Freescale MPC85xx, MPC83xx DMA Engine support
*
* Copyright (C) 2007-2010 Freescale Semiconductor, Inc. All rights reserved.
*
* Author:
* Zhang Wei <[email protected]>, Jul 2007
* Ebony Zhu <[email protected]>, May 2007
*
* Description:
* DMA engine driver for Freescale MPC8540 DMA controller, which is
* also fit for MPC8560, MPC8555, MPC8548, MPC8641, and etc.
* The support for MPC8349 DMA controller is also added.
*
* This driver instructs the DMA controller to issue the PCI Read Multiple
* command for PCI read operations, instead of using the default PCI Read Line
* command. Please be aware that this setting may result in read pre-fetching
* on some platforms.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/fsldma.h>
#include "dmaengine.h"
#include "fsldma.h"
#define chan_dbg(chan, fmt, arg...) \
dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg)
#define chan_err(chan, fmt, arg...) \
dev_err(chan->dev, "%s: " fmt, chan->name, ##arg)
static const char msg_ld_oom[] = "No free memory for link descriptor";
/*
* Register Helpers
*/
static void set_sr(struct fsldma_chan *chan, u32 val)
{
FSL_DMA_OUT(chan, &chan->regs->sr, val, 32);
}
static u32 get_sr(struct fsldma_chan *chan)
{
return FSL_DMA_IN(chan, &chan->regs->sr, 32);
}
static void set_mr(struct fsldma_chan *chan, u32 val)
{
FSL_DMA_OUT(chan, &chan->regs->mr, val, 32);
}
static u32 get_mr(struct fsldma_chan *chan)
{
return FSL_DMA_IN(chan, &chan->regs->mr, 32);
}
static void set_cdar(struct fsldma_chan *chan, dma_addr_t addr)
{
FSL_DMA_OUT(chan, &chan->regs->cdar, addr | FSL_DMA_SNEN, 64);
}
static dma_addr_t get_cdar(struct fsldma_chan *chan)
{
return FSL_DMA_IN(chan, &chan->regs->cdar, 64) & ~FSL_DMA_SNEN;
}
static void set_bcr(struct fsldma_chan *chan, u32 val)
{
FSL_DMA_OUT(chan, &chan->regs->bcr, val, 32);
}
static u32 get_bcr(struct fsldma_chan *chan)
{
return FSL_DMA_IN(chan, &chan->regs->bcr, 32);
}
/*
* Descriptor Helpers
*/
static void set_desc_cnt(struct fsldma_chan *chan,
struct fsl_dma_ld_hw *hw, u32 count)
{
hw->count = CPU_TO_DMA(chan, count, 32);
}
static void set_desc_src(struct fsldma_chan *chan,
struct fsl_dma_ld_hw *hw, dma_addr_t src)
{
u64 snoop_bits;
snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX)
? ((u64)FSL_DMA_SATR_SREADTYPE_SNOOP_READ << 32) : 0;
hw->src_addr = CPU_TO_DMA(chan, snoop_bits | src, 64);
}
static void set_desc_dst(struct fsldma_chan *chan,
struct fsl_dma_ld_hw *hw, dma_addr_t dst)
{
u64 snoop_bits;
snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX)
? ((u64)FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE << 32) : 0;
hw->dst_addr = CPU_TO_DMA(chan, snoop_bits | dst, 64);
}
static void set_desc_next(struct fsldma_chan *chan,
struct fsl_dma_ld_hw *hw, dma_addr_t next)
{
u64 snoop_bits;
snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX)
? FSL_DMA_SNEN : 0;
hw->next_ln_addr = CPU_TO_DMA(chan, snoop_bits | next, 64);
}
static void set_ld_eol(struct fsldma_chan *chan, struct fsl_desc_sw *desc)
{
u64 snoop_bits;
snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX)
? FSL_DMA_SNEN : 0;
desc->hw.next_ln_addr = CPU_TO_DMA(chan,
DMA_TO_CPU(chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL
| snoop_bits, 64);
}
/*
* DMA Engine Hardware Control Helpers
*/
static void dma_init(struct fsldma_chan *chan)
{
/* Reset the channel */
set_mr(chan, 0);
switch (chan->feature & FSL_DMA_IP_MASK) {
case FSL_DMA_IP_85XX:
/* Set the channel to below modes:
* EIE - Error interrupt enable
* EOLNIE - End of links interrupt enable
* BWC - Bandwidth sharing among channels
*/
set_mr(chan, FSL_DMA_MR_BWC | FSL_DMA_MR_EIE
| FSL_DMA_MR_EOLNIE);
break;
case FSL_DMA_IP_83XX:
/* Set the channel to below modes:
* EOTIE - End-of-transfer interrupt enable
* PRC_RM - PCI read multiple
*/
set_mr(chan, FSL_DMA_MR_EOTIE | FSL_DMA_MR_PRC_RM);
break;
}
}
static int dma_is_idle(struct fsldma_chan *chan)
{
u32 sr = get_sr(chan);
return (!(sr & FSL_DMA_SR_CB)) || (sr & FSL_DMA_SR_CH);
}
/*
* Start the DMA controller
*
* Preconditions:
* - the CDAR register must point to the start descriptor
* - the MRn[CS] bit must be cleared
*/
static void dma_start(struct fsldma_chan *chan)
{
u32 mode;
mode = get_mr(chan);
if (chan->feature & FSL_DMA_CHAN_PAUSE_EXT) {
set_bcr(chan, 0);
mode |= FSL_DMA_MR_EMP_EN;
} else {
mode &= ~FSL_DMA_MR_EMP_EN;
}
if (chan->feature & FSL_DMA_CHAN_START_EXT) {
mode |= FSL_DMA_MR_EMS_EN;
} else {
mode &= ~FSL_DMA_MR_EMS_EN;
mode |= FSL_DMA_MR_CS;
}
set_mr(chan, mode);
}
static void dma_halt(struct fsldma_chan *chan)
{
u32 mode;
int i;
/* read the mode register */
mode = get_mr(chan);
/*
* The 85xx controller supports channel abort, which will stop
* the current transfer. On 83xx, this bit is the transfer error
* mask bit, which should not be changed.
*/
if ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) {
mode |= FSL_DMA_MR_CA;
set_mr(chan, mode);
mode &= ~FSL_DMA_MR_CA;
}
/* stop the DMA controller */
mode &= ~(FSL_DMA_MR_CS | FSL_DMA_MR_EMS_EN);
set_mr(chan, mode);
/* wait for the DMA controller to become idle */
for (i = 0; i < 100; i++) {
if (dma_is_idle(chan))
return;
udelay(10);
}
if (!dma_is_idle(chan))
chan_err(chan, "DMA halt timeout!\n");
}
/**
* fsl_chan_set_src_loop_size - Set source address hold transfer size
* @chan : Freescale DMA channel
* @size : Address loop size, 0 for disable loop
*
* The set source address hold transfer size. The source
* address hold or loop transfer size is when the DMA transfer
* data from source address (SA), if the loop size is 4, the DMA will
* read data from SA, SA + 1, SA + 2, SA + 3, then loop back to SA,
* SA + 1 ... and so on.
*/
static void fsl_chan_set_src_loop_size(struct fsldma_chan *chan, int size)
{
u32 mode;
mode = get_mr(chan);
switch (size) {
case 0:
mode &= ~FSL_DMA_MR_SAHE;
break;
case 1:
case 2:
case 4:
case 8:
mode &= ~FSL_DMA_MR_SAHTS_MASK;
mode |= FSL_DMA_MR_SAHE | (__ilog2(size) << 14);
break;
}
set_mr(chan, mode);
}
/**
* fsl_chan_set_dst_loop_size - Set destination address hold transfer size
* @chan : Freescale DMA channel
* @size : Address loop size, 0 for disable loop
*
* The set destination address hold transfer size. The destination
* address hold or loop transfer size is when the DMA transfer
* data to destination address (TA), if the loop size is 4, the DMA will
* write data to TA, TA + 1, TA + 2, TA + 3, then loop back to TA,
* TA + 1 ... and so on.
*/
static void fsl_chan_set_dst_loop_size(struct fsldma_chan *chan, int size)
{
u32 mode;
mode = get_mr(chan);
switch (size) {
case 0:
mode &= ~FSL_DMA_MR_DAHE;
break;
case 1:
case 2:
case 4:
case 8:
mode &= ~FSL_DMA_MR_DAHTS_MASK;
mode |= FSL_DMA_MR_DAHE | (__ilog2(size) << 16);
break;
}
set_mr(chan, mode);
}
/**
* fsl_chan_set_request_count - Set DMA Request Count for external control
* @chan : Freescale DMA channel
* @size : Number of bytes to transfer in a single request
*
* The Freescale DMA channel can be controlled by the external signal DREQ#.
* The DMA request count is how many bytes are allowed to transfer before
* pausing the channel, after which a new assertion of DREQ# resumes channel
* operation.
*
* A size of 0 disables external pause control. The maximum size is 1024.
*/
static void fsl_chan_set_request_count(struct fsldma_chan *chan, int size)
{
u32 mode;
BUG_ON(size > 1024);
mode = get_mr(chan);
mode &= ~FSL_DMA_MR_BWC_MASK;
mode |= (__ilog2(size) << 24) & FSL_DMA_MR_BWC_MASK;
set_mr(chan, mode);
}
/**
* fsl_chan_toggle_ext_pause - Toggle channel external pause status
* @chan : Freescale DMA channel
* @enable : 0 is disabled, 1 is enabled.
*
* The Freescale DMA channel can be controlled by the external signal DREQ#.
* The DMA Request Count feature should be used in addition to this feature
* to set the number of bytes to transfer before pausing the channel.
*/
static void fsl_chan_toggle_ext_pause(struct fsldma_chan *chan, int enable)
{
if (enable)
chan->feature |= FSL_DMA_CHAN_PAUSE_EXT;
else
chan->feature &= ~FSL_DMA_CHAN_PAUSE_EXT;
}
/**
* fsl_chan_toggle_ext_start - Toggle channel external start status
* @chan : Freescale DMA channel
* @enable : 0 is disabled, 1 is enabled.
*
* If enable the external start, the channel can be started by an
* external DMA start pin. So the dma_start() does not start the
* transfer immediately. The DMA channel will wait for the
* control pin asserted.
*/
static void fsl_chan_toggle_ext_start(struct fsldma_chan *chan, int enable)
{
if (enable)
chan->feature |= FSL_DMA_CHAN_START_EXT;
else
chan->feature &= ~FSL_DMA_CHAN_START_EXT;
}
int fsl_dma_external_start(struct dma_chan *dchan, int enable)
{
struct fsldma_chan *chan;
if (!dchan)
return -EINVAL;
chan = to_fsl_chan(dchan);
fsl_chan_toggle_ext_start(chan, enable);
return 0;
}
EXPORT_SYMBOL_GPL(fsl_dma_external_start);
static void append_ld_queue(struct fsldma_chan *chan, struct fsl_desc_sw *desc)
{
struct fsl_desc_sw *tail = to_fsl_desc(chan->ld_pending.prev);
if (list_empty(&chan->ld_pending))
goto out_splice;
/*
* Add the hardware descriptor to the chain of hardware descriptors
* that already exists in memory.
*
* This will un-set the EOL bit of the existing transaction, and the
* last link in this transaction will become the EOL descriptor.
*/
set_desc_next(chan, &tail->hw, desc->async_tx.phys);
/*
* Add the software descriptor and all children to the list
* of pending transactions
*/
out_splice:
list_splice_tail_init(&desc->tx_list, &chan->ld_pending);
}
static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct fsldma_chan *chan = to_fsl_chan(tx->chan);
struct fsl_desc_sw *desc = tx_to_fsl_desc(tx);
struct fsl_desc_sw *child;
dma_cookie_t cookie = -EINVAL;
spin_lock_bh(&chan->desc_lock);
#ifdef CONFIG_PM
if (unlikely(chan->pm_state != RUNNING)) {
chan_dbg(chan, "cannot submit due to suspend\n");
spin_unlock_bh(&chan->desc_lock);
return -1;
}
#endif
/*
* assign cookies to all of the software descriptors
* that make up this transaction
*/
list_for_each_entry(child, &desc->tx_list, node) {
cookie = dma_cookie_assign(&child->async_tx);
}
/* put this transaction onto the tail of the pending queue */
append_ld_queue(chan, desc);
spin_unlock_bh(&chan->desc_lock);
return cookie;
}
/**
* fsl_dma_free_descriptor - Free descriptor from channel's DMA pool.
* @chan : Freescale DMA channel
* @desc: descriptor to be freed
*/
static void fsl_dma_free_descriptor(struct fsldma_chan *chan,
struct fsl_desc_sw *desc)
{
list_del(&desc->node);
chan_dbg(chan, "LD %p free\n", desc);
dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
}
/**
* fsl_dma_alloc_descriptor - Allocate descriptor from channel's DMA pool.
* @chan : Freescale DMA channel
*
* Return - The descriptor allocated. NULL for failed.
*/
static struct fsl_desc_sw *fsl_dma_alloc_descriptor(struct fsldma_chan *chan)
{
struct fsl_desc_sw *desc;
dma_addr_t pdesc;
desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
if (!desc) {
chan_dbg(chan, "out of memory for link descriptor\n");
return NULL;
}
INIT_LIST_HEAD(&desc->tx_list);
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
desc->async_tx.tx_submit = fsl_dma_tx_submit;
desc->async_tx.phys = pdesc;
chan_dbg(chan, "LD %p allocated\n", desc);
return desc;
}
/**
* fsldma_clean_completed_descriptor - free all descriptors which
* has been completed and acked
* @chan: Freescale DMA channel
*
* This function is used on all completed and acked descriptors.
* All descriptors should only be freed in this function.
*/
static void fsldma_clean_completed_descriptor(struct fsldma_chan *chan)
{
struct fsl_desc_sw *desc, *_desc;
/* Run the callback for each descriptor, in order */
list_for_each_entry_safe(desc, _desc, &chan->ld_completed, node)
if (async_tx_test_ack(&desc->async_tx))
fsl_dma_free_descriptor(chan, desc);
}
/**
* fsldma_run_tx_complete_actions - cleanup a single link descriptor
* @chan: Freescale DMA channel
* @desc: descriptor to cleanup and free
* @cookie: Freescale DMA transaction identifier
*
* This function is used on a descriptor which has been executed by the DMA
* controller. It will run any callbacks, submit any dependencies.
*/
static dma_cookie_t fsldma_run_tx_complete_actions(struct fsldma_chan *chan,
struct fsl_desc_sw *desc, dma_cookie_t cookie)
{
struct dma_async_tx_descriptor *txd = &desc->async_tx;
dma_cookie_t ret = cookie;
BUG_ON(txd->cookie < 0);
if (txd->cookie > 0) {
ret = txd->cookie;
dma_descriptor_unmap(txd);
/* Run the link descriptor callback function */
dmaengine_desc_get_callback_invoke(txd, NULL);
}
/* Run any dependencies */
dma_run_dependencies(txd);
return ret;
}
/**
* fsldma_clean_running_descriptor - move the completed descriptor from
* ld_running to ld_completed
* @chan: Freescale DMA channel
* @desc: the descriptor which is completed
*
* Free the descriptor directly if acked by async_tx api, or move it to
* queue ld_completed.
*/
static void fsldma_clean_running_descriptor(struct fsldma_chan *chan,
struct fsl_desc_sw *desc)
{
/* Remove from the list of transactions */
list_del(&desc->node);
/*
* the client is allowed to attach dependent operations
* until 'ack' is set
*/
if (!async_tx_test_ack(&desc->async_tx)) {
/*
* Move this descriptor to the list of descriptors which is
* completed, but still awaiting the 'ack' bit to be set.
*/
list_add_tail(&desc->node, &chan->ld_completed);
return;
}
dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
}
/**
* fsl_chan_xfer_ld_queue - transfer any pending transactions
* @chan : Freescale DMA channel
*
* HARDWARE STATE: idle
* LOCKING: must hold chan->desc_lock
*/
static void fsl_chan_xfer_ld_queue(struct fsldma_chan *chan)
{
struct fsl_desc_sw *desc;
/*
* If the list of pending descriptors is empty, then we
* don't need to do any work at all
*/
if (list_empty(&chan->ld_pending)) {
chan_dbg(chan, "no pending LDs\n");
return;
}
/*
* The DMA controller is not idle, which means that the interrupt
* handler will start any queued transactions when it runs after
* this transaction finishes
*/
if (!chan->idle) {
chan_dbg(chan, "DMA controller still busy\n");
return;
}
/*
* If there are some link descriptors which have not been
* transferred, we need to start the controller
*/
/*
* Move all elements from the queue of pending transactions
* onto the list of running transactions
*/
chan_dbg(chan, "idle, starting controller\n");
desc = list_first_entry(&chan->ld_pending, struct fsl_desc_sw, node);
list_splice_tail_init(&chan->ld_pending, &chan->ld_running);
/*
* The 85xx DMA controller doesn't clear the channel start bit
* automatically at the end of a transfer. Therefore we must clear
* it in software before starting the transfer.
*/
if ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) {
u32 mode;
mode = get_mr(chan);
mode &= ~FSL_DMA_MR_CS;
set_mr(chan, mode);
}
/*
* Program the descriptor's address into the DMA controller,
* then start the DMA transaction
*/
set_cdar(chan, desc->async_tx.phys);
get_cdar(chan);
dma_start(chan);
chan->idle = false;
}
/**
* fsldma_cleanup_descriptors - cleanup link descriptors which are completed
* and move them to ld_completed to free until flag 'ack' is set
* @chan: Freescale DMA channel
*
* This function is used on descriptors which have been executed by the DMA
* controller. It will run any callbacks, submit any dependencies, then
* free these descriptors if flag 'ack' is set.
*/
static void fsldma_cleanup_descriptors(struct fsldma_chan *chan)
{
struct fsl_desc_sw *desc, *_desc;
dma_cookie_t cookie = 0;
dma_addr_t curr_phys = get_cdar(chan);
int seen_current = 0;
fsldma_clean_completed_descriptor(chan);
/* Run the callback for each descriptor, in order */
list_for_each_entry_safe(desc, _desc, &chan->ld_running, node) {
/*
* do not advance past the current descriptor loaded into the
* hardware channel, subsequent descriptors are either in
* process or have not been submitted
*/
if (seen_current)
break;
/*
* stop the search if we reach the current descriptor and the
* channel is busy
*/
if (desc->async_tx.phys == curr_phys) {
seen_current = 1;
if (!dma_is_idle(chan))
break;
}
cookie = fsldma_run_tx_complete_actions(chan, desc, cookie);
fsldma_clean_running_descriptor(chan, desc);
}
/*
* Start any pending transactions automatically
*
* In the ideal case, we keep the DMA controller busy while we go
* ahead and free the descriptors below.
*/
fsl_chan_xfer_ld_queue(chan);
if (cookie > 0)
chan->common.completed_cookie = cookie;
}
/**
* fsl_dma_alloc_chan_resources - Allocate resources for DMA channel.
* @chan : Freescale DMA channel
*
* This function will create a dma pool for descriptor allocation.
*
* Return - The number of descriptors allocated.
*/
static int fsl_dma_alloc_chan_resources(struct dma_chan *dchan)
{
struct fsldma_chan *chan = to_fsl_chan(dchan);
/* Has this channel already been allocated? */
if (chan->desc_pool)
return 1;
/*
* We need the descriptor to be aligned to 32bytes
* for meeting FSL DMA specification requirement.
*/
chan->desc_pool = dma_pool_create(chan->name, chan->dev,
sizeof(struct fsl_desc_sw),
__alignof__(struct fsl_desc_sw), 0);
if (!chan->desc_pool) {
chan_err(chan, "unable to allocate descriptor pool\n");
return -ENOMEM;
}
/* there is at least one descriptor free to be allocated */
return 1;
}
/**
* fsldma_free_desc_list - Free all descriptors in a queue
* @chan: Freescae DMA channel
* @list: the list to free
*
* LOCKING: must hold chan->desc_lock
*/
static void fsldma_free_desc_list(struct fsldma_chan *chan,
struct list_head *list)
{
struct fsl_desc_sw *desc, *_desc;
list_for_each_entry_safe(desc, _desc, list, node)
fsl_dma_free_descriptor(chan, desc);
}
static void fsldma_free_desc_list_reverse(struct fsldma_chan *chan,
struct list_head *list)
{
struct fsl_desc_sw *desc, *_desc;
list_for_each_entry_safe_reverse(desc, _desc, list, node)
fsl_dma_free_descriptor(chan, desc);
}
/**
* fsl_dma_free_chan_resources - Free all resources of the channel.
* @chan : Freescale DMA channel
*/
static void fsl_dma_free_chan_resources(struct dma_chan *dchan)
{
struct fsldma_chan *chan = to_fsl_chan(dchan);
chan_dbg(chan, "free all channel resources\n");
spin_lock_bh(&chan->desc_lock);
fsldma_cleanup_descriptors(chan);
fsldma_free_desc_list(chan, &chan->ld_pending);
fsldma_free_desc_list(chan, &chan->ld_running);
fsldma_free_desc_list(chan, &chan->ld_completed);
spin_unlock_bh(&chan->desc_lock);
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
}
static struct dma_async_tx_descriptor *
fsl_dma_prep_memcpy(struct dma_chan *dchan,
dma_addr_t dma_dst, dma_addr_t dma_src,
size_t len, unsigned long flags)
{
struct fsldma_chan *chan;
struct fsl_desc_sw *first = NULL, *prev = NULL, *new;
size_t copy;
if (!dchan)
return NULL;
if (!len)
return NULL;
chan = to_fsl_chan(dchan);
do {
/* Allocate the link descriptor from DMA pool */
new = fsl_dma_alloc_descriptor(chan);
if (!new) {
chan_err(chan, "%s\n", msg_ld_oom);
goto fail;
}
copy = min(len, (size_t)FSL_DMA_BCR_MAX_CNT);
set_desc_cnt(chan, &new->hw, copy);
set_desc_src(chan, &new->hw, dma_src);
set_desc_dst(chan, &new->hw, dma_dst);
if (!first)
first = new;
else
set_desc_next(chan, &prev->hw, new->async_tx.phys);
new->async_tx.cookie = 0;
async_tx_ack(&new->async_tx);
prev = new;
len -= copy;
dma_src += copy;
dma_dst += copy;
/* Insert the link descriptor to the LD ring */
list_add_tail(&new->node, &first->tx_list);
} while (len);
new->async_tx.flags = flags; /* client is in control of this ack */
new->async_tx.cookie = -EBUSY;
/* Set End-of-link to the last link descriptor of new list */
set_ld_eol(chan, new);
return &first->async_tx;
fail:
if (!first)
return NULL;
fsldma_free_desc_list_reverse(chan, &first->tx_list);
return NULL;
}
static int fsl_dma_device_terminate_all(struct dma_chan *dchan)
{
struct fsldma_chan *chan;
if (!dchan)
return -EINVAL;
chan = to_fsl_chan(dchan);
spin_lock_bh(&chan->desc_lock);
/* Halt the DMA engine */
dma_halt(chan);
/* Remove and free all of the descriptors in the LD queue */
fsldma_free_desc_list(chan, &chan->ld_pending);
fsldma_free_desc_list(chan, &chan->ld_running);
fsldma_free_desc_list(chan, &chan->ld_completed);
chan->idle = true;
spin_unlock_bh(&chan->desc_lock);
return 0;
}
static int fsl_dma_device_config(struct dma_chan *dchan,
struct dma_slave_config *config)
{
struct fsldma_chan *chan;
int size;
if (!dchan)
return -EINVAL;
chan = to_fsl_chan(dchan);
/* make sure the channel supports setting burst size */
if (!chan->set_request_count)
return -ENXIO;
/* we set the controller burst size depending on direction */
if (config->direction == DMA_MEM_TO_DEV)
size = config->dst_addr_width * config->dst_maxburst;
else
size = config->src_addr_width * config->src_maxburst;
chan->set_request_count(chan, size);
return 0;
}
/**
* fsl_dma_memcpy_issue_pending - Issue the DMA start command
* @chan : Freescale DMA channel
*/
static void fsl_dma_memcpy_issue_pending(struct dma_chan *dchan)
{
struct fsldma_chan *chan = to_fsl_chan(dchan);
spin_lock_bh(&chan->desc_lock);
fsl_chan_xfer_ld_queue(chan);
spin_unlock_bh(&chan->desc_lock);
}
/**
* fsl_tx_status - Determine the DMA status
* @chan : Freescale DMA channel
*/
static enum dma_status fsl_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct fsldma_chan *chan = to_fsl_chan(dchan);
enum dma_status ret;
ret = dma_cookie_status(dchan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
spin_lock_bh(&chan->desc_lock);
fsldma_cleanup_descriptors(chan);
spin_unlock_bh(&chan->desc_lock);
return dma_cookie_status(dchan, cookie, txstate);
}
/*----------------------------------------------------------------------------*/
/* Interrupt Handling */
/*----------------------------------------------------------------------------*/
static irqreturn_t fsldma_chan_irq(int irq, void *data)
{
struct fsldma_chan *chan = data;
u32 stat;
/* save and clear the status register */
stat = get_sr(chan);
set_sr(chan, stat);
chan_dbg(chan, "irq: stat = 0x%x\n", stat);
/* check that this was really our device */
stat &= ~(FSL_DMA_SR_CB | FSL_DMA_SR_CH);
if (!stat)
return IRQ_NONE;
if (stat & FSL_DMA_SR_TE)
chan_err(chan, "Transfer Error!\n");
/*
* Programming Error
* The DMA_INTERRUPT async_tx is a NULL transfer, which will
* trigger a PE interrupt.
*/
if (stat & FSL_DMA_SR_PE) {
chan_dbg(chan, "irq: Programming Error INT\n");
stat &= ~FSL_DMA_SR_PE;
if (get_bcr(chan) != 0)
chan_err(chan, "Programming Error!\n");
}
/*
* For MPC8349, EOCDI event need to update cookie
* and start the next transfer if it exist.
*/
if (stat & FSL_DMA_SR_EOCDI) {
chan_dbg(chan, "irq: End-of-Chain link INT\n");
stat &= ~FSL_DMA_SR_EOCDI;
}
/*
* If it current transfer is the end-of-transfer,
* we should clear the Channel Start bit for
* prepare next transfer.
*/
if (stat & FSL_DMA_SR_EOLNI) {
chan_dbg(chan, "irq: End-of-link INT\n");
stat &= ~FSL_DMA_SR_EOLNI;
}
/* check that the DMA controller is really idle */
if (!dma_is_idle(chan))
chan_err(chan, "irq: controller not idle!\n");
/* check that we handled all of the bits */
if (stat)
chan_err(chan, "irq: unhandled sr 0x%08x\n", stat);
/*
* Schedule the tasklet to handle all cleanup of the current
* transaction. It will start a new transaction if there is
* one pending.
*/
tasklet_schedule(&chan->tasklet);
chan_dbg(chan, "irq: Exit\n");
return IRQ_HANDLED;
}
static void dma_do_tasklet(struct tasklet_struct *t)
{
struct fsldma_chan *chan = from_tasklet(chan, t, tasklet);
chan_dbg(chan, "tasklet entry\n");
spin_lock(&chan->desc_lock);
/* the hardware is now idle and ready for more */
chan->idle = true;
/* Run all cleanup for descriptors which have been completed */
fsldma_cleanup_descriptors(chan);
spin_unlock(&chan->desc_lock);
chan_dbg(chan, "tasklet exit\n");
}
static irqreturn_t fsldma_ctrl_irq(int irq, void *data)
{
struct fsldma_device *fdev = data;
struct fsldma_chan *chan;
unsigned int handled = 0;
u32 gsr, mask;
int i;
gsr = (fdev->feature & FSL_DMA_BIG_ENDIAN) ? in_be32(fdev->regs)
: in_le32(fdev->regs);
mask = 0xff000000;
dev_dbg(fdev->dev, "IRQ: gsr 0x%.8x\n", gsr);
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
chan = fdev->chan[i];
if (!chan)
continue;
if (gsr & mask) {
dev_dbg(fdev->dev, "IRQ: chan %d\n", chan->id);
fsldma_chan_irq(irq, chan);
handled++;
}
gsr &= ~mask;
mask >>= 8;
}
return IRQ_RETVAL(handled);
}
static void fsldma_free_irqs(struct fsldma_device *fdev)
{
struct fsldma_chan *chan;
int i;
if (fdev->irq) {
dev_dbg(fdev->dev, "free per-controller IRQ\n");
free_irq(fdev->irq, fdev);
return;
}
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
chan = fdev->chan[i];
if (chan && chan->irq) {
chan_dbg(chan, "free per-channel IRQ\n");
free_irq(chan->irq, chan);
}
}
}
static int fsldma_request_irqs(struct fsldma_device *fdev)
{
struct fsldma_chan *chan;
int ret;
int i;
/* if we have a per-controller IRQ, use that */
if (fdev->irq) {
dev_dbg(fdev->dev, "request per-controller IRQ\n");
ret = request_irq(fdev->irq, fsldma_ctrl_irq, IRQF_SHARED,
"fsldma-controller", fdev);
return ret;
}
/* no per-controller IRQ, use the per-channel IRQs */
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
chan = fdev->chan[i];
if (!chan)
continue;
if (!chan->irq) {
chan_err(chan, "interrupts property missing in device tree\n");
ret = -ENODEV;
goto out_unwind;
}
chan_dbg(chan, "request per-channel IRQ\n");
ret = request_irq(chan->irq, fsldma_chan_irq, IRQF_SHARED,
"fsldma-chan", chan);
if (ret) {
chan_err(chan, "unable to request per-channel IRQ\n");
goto out_unwind;
}
}
return 0;
out_unwind:
for (/* none */; i >= 0; i--) {
chan = fdev->chan[i];
if (!chan)
continue;
if (!chan->irq)
continue;
free_irq(chan->irq, chan);
}
return ret;
}
/*----------------------------------------------------------------------------*/
/* OpenFirmware Subsystem */
/*----------------------------------------------------------------------------*/
static int fsl_dma_chan_probe(struct fsldma_device *fdev,
struct device_node *node, u32 feature, const char *compatible)
{
struct fsldma_chan *chan;
struct resource res;
int err;
/* alloc channel */
chan = kzalloc(sizeof(*chan), GFP_KERNEL);
if (!chan) {
err = -ENOMEM;
goto out_return;
}
/* ioremap registers for use */
chan->regs = of_iomap(node, 0);
if (!chan->regs) {
dev_err(fdev->dev, "unable to ioremap registers\n");
err = -ENOMEM;
goto out_free_chan;
}
err = of_address_to_resource(node, 0, &res);
if (err) {
dev_err(fdev->dev, "unable to find 'reg' property\n");
goto out_iounmap_regs;
}
chan->feature = feature;
if (!fdev->feature)
fdev->feature = chan->feature;
/*
* If the DMA device's feature is different than the feature
* of its channels, report the bug
*/
WARN_ON(fdev->feature != chan->feature);
chan->dev = fdev->dev;
chan->id = (res.start & 0xfff) < 0x300 ?
((res.start - 0x100) & 0xfff) >> 7 :
((res.start - 0x200) & 0xfff) >> 7;
if (chan->id >= FSL_DMA_MAX_CHANS_PER_DEVICE) {
dev_err(fdev->dev, "too many channels for device\n");
err = -EINVAL;
goto out_iounmap_regs;
}
fdev->chan[chan->id] = chan;
tasklet_setup(&chan->tasklet, dma_do_tasklet);
snprintf(chan->name, sizeof(chan->name), "chan%d", chan->id);
/* Initialize the channel */
dma_init(chan);
/* Clear cdar registers */
set_cdar(chan, 0);
switch (chan->feature & FSL_DMA_IP_MASK) {
case FSL_DMA_IP_85XX:
chan->toggle_ext_pause = fsl_chan_toggle_ext_pause;
fallthrough;
case FSL_DMA_IP_83XX:
chan->toggle_ext_start = fsl_chan_toggle_ext_start;
chan->set_src_loop_size = fsl_chan_set_src_loop_size;
chan->set_dst_loop_size = fsl_chan_set_dst_loop_size;
chan->set_request_count = fsl_chan_set_request_count;
}
spin_lock_init(&chan->desc_lock);
INIT_LIST_HEAD(&chan->ld_pending);
INIT_LIST_HEAD(&chan->ld_running);
INIT_LIST_HEAD(&chan->ld_completed);
chan->idle = true;
#ifdef CONFIG_PM
chan->pm_state = RUNNING;
#endif
chan->common.device = &fdev->common;
dma_cookie_init(&chan->common);
/* find the IRQ line, if it exists in the device tree */
chan->irq = irq_of_parse_and_map(node, 0);
/* Add the channel to DMA device channel list */
list_add_tail(&chan->common.device_node, &fdev->common.channels);
dev_info(fdev->dev, "#%d (%s), irq %d\n", chan->id, compatible,
chan->irq ? chan->irq : fdev->irq);
return 0;
out_iounmap_regs:
iounmap(chan->regs);
out_free_chan:
kfree(chan);
out_return:
return err;
}
static void fsl_dma_chan_remove(struct fsldma_chan *chan)
{
irq_dispose_mapping(chan->irq);
list_del(&chan->common.device_node);
iounmap(chan->regs);
kfree(chan);
}
static int fsldma_of_probe(struct platform_device *op)
{
struct fsldma_device *fdev;
struct device_node *child;
unsigned int i;
int err;
fdev = kzalloc(sizeof(*fdev), GFP_KERNEL);
if (!fdev) {
err = -ENOMEM;
goto out_return;
}
fdev->dev = &op->dev;
INIT_LIST_HEAD(&fdev->common.channels);
/* ioremap the registers for use */
fdev->regs = of_iomap(op->dev.of_node, 0);
if (!fdev->regs) {
dev_err(&op->dev, "unable to ioremap registers\n");
err = -ENOMEM;
goto out_free;
}
/* map the channel IRQ if it exists, but don't hookup the handler yet */
fdev->irq = irq_of_parse_and_map(op->dev.of_node, 0);
dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask);
dma_cap_set(DMA_SLAVE, fdev->common.cap_mask);
fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources;
fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources;
fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy;
fdev->common.device_tx_status = fsl_tx_status;
fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending;
fdev->common.device_config = fsl_dma_device_config;
fdev->common.device_terminate_all = fsl_dma_device_terminate_all;
fdev->common.dev = &op->dev;
fdev->common.src_addr_widths = FSL_DMA_BUSWIDTHS;
fdev->common.dst_addr_widths = FSL_DMA_BUSWIDTHS;
fdev->common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
fdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
dma_set_mask(&(op->dev), DMA_BIT_MASK(36));
platform_set_drvdata(op, fdev);
/*
* We cannot use of_platform_bus_probe() because there is no
* of_platform_bus_remove(). Instead, we manually instantiate every DMA
* channel object.
*/
for_each_child_of_node(op->dev.of_node, child) {
if (of_device_is_compatible(child, "fsl,eloplus-dma-channel")) {
fsl_dma_chan_probe(fdev, child,
FSL_DMA_IP_85XX | FSL_DMA_BIG_ENDIAN,
"fsl,eloplus-dma-channel");
}
if (of_device_is_compatible(child, "fsl,elo-dma-channel")) {
fsl_dma_chan_probe(fdev, child,
FSL_DMA_IP_83XX | FSL_DMA_LITTLE_ENDIAN,
"fsl,elo-dma-channel");
}
}
/*
* Hookup the IRQ handler(s)
*
* If we have a per-controller interrupt, we prefer that to the
* per-channel interrupts to reduce the number of shared interrupt
* handlers on the same IRQ line
*/
err = fsldma_request_irqs(fdev);
if (err) {
dev_err(fdev->dev, "unable to request IRQs\n");
goto out_free_fdev;
}
dma_async_device_register(&fdev->common);
return 0;
out_free_fdev:
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
if (fdev->chan[i])
fsl_dma_chan_remove(fdev->chan[i]);
}
irq_dispose_mapping(fdev->irq);
iounmap(fdev->regs);
out_free:
kfree(fdev);
out_return:
return err;
}
static int fsldma_of_remove(struct platform_device *op)
{
struct fsldma_device *fdev;
unsigned int i;
fdev = platform_get_drvdata(op);
dma_async_device_unregister(&fdev->common);
fsldma_free_irqs(fdev);
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
if (fdev->chan[i])
fsl_dma_chan_remove(fdev->chan[i]);
}
irq_dispose_mapping(fdev->irq);
iounmap(fdev->regs);
kfree(fdev);
return 0;
}
#ifdef CONFIG_PM
static int fsldma_suspend_late(struct device *dev)
{
struct fsldma_device *fdev = dev_get_drvdata(dev);
struct fsldma_chan *chan;
int i;
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
chan = fdev->chan[i];
if (!chan)
continue;
spin_lock_bh(&chan->desc_lock);
if (unlikely(!chan->idle))
goto out;
chan->regs_save.mr = get_mr(chan);
chan->pm_state = SUSPENDED;
spin_unlock_bh(&chan->desc_lock);
}
return 0;
out:
for (; i >= 0; i--) {
chan = fdev->chan[i];
if (!chan)
continue;
chan->pm_state = RUNNING;
spin_unlock_bh(&chan->desc_lock);
}
return -EBUSY;
}
static int fsldma_resume_early(struct device *dev)
{
struct fsldma_device *fdev = dev_get_drvdata(dev);
struct fsldma_chan *chan;
u32 mode;
int i;
for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
chan = fdev->chan[i];
if (!chan)
continue;
spin_lock_bh(&chan->desc_lock);
mode = chan->regs_save.mr
& ~FSL_DMA_MR_CS & ~FSL_DMA_MR_CC & ~FSL_DMA_MR_CA;
set_mr(chan, mode);
chan->pm_state = RUNNING;
spin_unlock_bh(&chan->desc_lock);
}
return 0;
}
static const struct dev_pm_ops fsldma_pm_ops = {
.suspend_late = fsldma_suspend_late,
.resume_early = fsldma_resume_early,
};
#endif
static const struct of_device_id fsldma_of_ids[] = {
{ .compatible = "fsl,elo3-dma", },
{ .compatible = "fsl,eloplus-dma", },
{ .compatible = "fsl,elo-dma", },
{}
};
MODULE_DEVICE_TABLE(of, fsldma_of_ids);
static struct platform_driver fsldma_of_driver = {
.driver = {
.name = "fsl-elo-dma",
.of_match_table = fsldma_of_ids,
#ifdef CONFIG_PM
.pm = &fsldma_pm_ops,
#endif
},
.probe = fsldma_of_probe,
.remove = fsldma_of_remove,
};
/*----------------------------------------------------------------------------*/
/* Module Init / Exit */
/*----------------------------------------------------------------------------*/
static __init int fsldma_init(void)
{
pr_info("Freescale Elo series DMA driver\n");
return platform_driver_register(&fsldma_of_driver);
}
static void __exit fsldma_exit(void)
{
platform_driver_unregister(&fsldma_of_driver);
}
subsys_initcall(fsldma_init);
module_exit(fsldma_exit);
MODULE_DESCRIPTION("Freescale Elo series DMA driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/fsldma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Device tree helpers for DMA request / controller
*
* Based on of_gpio.c
*
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include "dmaengine.h"
static LIST_HEAD(of_dma_list);
static DEFINE_MUTEX(of_dma_lock);
/**
* of_dma_find_controller - Get a DMA controller in DT DMA helpers list
* @dma_spec: pointer to DMA specifier as found in the device tree
*
* Finds a DMA controller with matching device node and number for dma cells
* in a list of registered DMA controllers. If a match is found a valid pointer
* to the DMA data stored is retuned. A NULL pointer is returned if no match is
* found.
*/
static struct of_dma *of_dma_find_controller(struct of_phandle_args *dma_spec)
{
struct of_dma *ofdma;
list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers)
if (ofdma->of_node == dma_spec->np)
return ofdma;
pr_debug("%s: can't find DMA controller %pOF\n", __func__,
dma_spec->np);
return NULL;
}
/**
* of_dma_router_xlate - translation function for router devices
* @dma_spec: pointer to DMA specifier as found in the device tree
* @ofdma: pointer to DMA controller data (router information)
*
* The function creates new dma_spec to be passed to the router driver's
* of_dma_route_allocate() function to prepare a dma_spec which will be used
* to request channel from the real DMA controller.
*/
static struct dma_chan *of_dma_router_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct dma_chan *chan;
struct of_dma *ofdma_target;
struct of_phandle_args dma_spec_target;
void *route_data;
/* translate the request for the real DMA controller */
memcpy(&dma_spec_target, dma_spec, sizeof(dma_spec_target));
route_data = ofdma->of_dma_route_allocate(&dma_spec_target, ofdma);
if (IS_ERR(route_data))
return NULL;
ofdma_target = of_dma_find_controller(&dma_spec_target);
if (!ofdma_target) {
ofdma->dma_router->route_free(ofdma->dma_router->dev,
route_data);
chan = ERR_PTR(-EPROBE_DEFER);
goto err;
}
chan = ofdma_target->of_dma_xlate(&dma_spec_target, ofdma_target);
if (IS_ERR_OR_NULL(chan)) {
ofdma->dma_router->route_free(ofdma->dma_router->dev,
route_data);
} else {
int ret = 0;
chan->router = ofdma->dma_router;
chan->route_data = route_data;
if (chan->device->device_router_config)
ret = chan->device->device_router_config(chan);
if (ret) {
dma_release_channel(chan);
chan = ERR_PTR(ret);
}
}
err:
/*
* Need to put the node back since the ofdma->of_dma_route_allocate
* has taken it for generating the new, translated dma_spec
*/
of_node_put(dma_spec_target.np);
return chan;
}
/**
* of_dma_controller_register - Register a DMA controller to DT DMA helpers
* @np: device node of DMA controller
* @of_dma_xlate: translation function which converts a phandle
* arguments list into a dma_chan structure
* @data: pointer to controller specific data to be used by
* translation function
*
* Returns 0 on success or appropriate errno value on error.
*
* Allocated memory should be freed with appropriate of_dma_controller_free()
* call.
*/
int of_dma_controller_register(struct device_node *np,
struct dma_chan *(*of_dma_xlate)
(struct of_phandle_args *, struct of_dma *),
void *data)
{
struct of_dma *ofdma;
if (!np || !of_dma_xlate) {
pr_err("%s: not enough information provided\n", __func__);
return -EINVAL;
}
ofdma = kzalloc(sizeof(*ofdma), GFP_KERNEL);
if (!ofdma)
return -ENOMEM;
ofdma->of_node = np;
ofdma->of_dma_xlate = of_dma_xlate;
ofdma->of_dma_data = data;
/* Now queue of_dma controller structure in list */
mutex_lock(&of_dma_lock);
list_add_tail(&ofdma->of_dma_controllers, &of_dma_list);
mutex_unlock(&of_dma_lock);
return 0;
}
EXPORT_SYMBOL_GPL(of_dma_controller_register);
/**
* of_dma_controller_free - Remove a DMA controller from DT DMA helpers list
* @np: device node of DMA controller
*
* Memory allocated by of_dma_controller_register() is freed here.
*/
void of_dma_controller_free(struct device_node *np)
{
struct of_dma *ofdma;
mutex_lock(&of_dma_lock);
list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers)
if (ofdma->of_node == np) {
list_del(&ofdma->of_dma_controllers);
kfree(ofdma);
break;
}
mutex_unlock(&of_dma_lock);
}
EXPORT_SYMBOL_GPL(of_dma_controller_free);
/**
* of_dma_router_register - Register a DMA router to DT DMA helpers as a
* controller
* @np: device node of DMA router
* @of_dma_route_allocate: setup function for the router which need to
* modify the dma_spec for the DMA controller to
* use and to set up the requested route.
* @dma_router: pointer to dma_router structure to be used when
* the route need to be free up.
*
* Returns 0 on success or appropriate errno value on error.
*
* Allocated memory should be freed with appropriate of_dma_controller_free()
* call.
*/
int of_dma_router_register(struct device_node *np,
void *(*of_dma_route_allocate)
(struct of_phandle_args *, struct of_dma *),
struct dma_router *dma_router)
{
struct of_dma *ofdma;
if (!np || !of_dma_route_allocate || !dma_router) {
pr_err("%s: not enough information provided\n", __func__);
return -EINVAL;
}
ofdma = kzalloc(sizeof(*ofdma), GFP_KERNEL);
if (!ofdma)
return -ENOMEM;
ofdma->of_node = np;
ofdma->of_dma_xlate = of_dma_router_xlate;
ofdma->of_dma_route_allocate = of_dma_route_allocate;
ofdma->dma_router = dma_router;
/* Now queue of_dma controller structure in list */
mutex_lock(&of_dma_lock);
list_add_tail(&ofdma->of_dma_controllers, &of_dma_list);
mutex_unlock(&of_dma_lock);
return 0;
}
EXPORT_SYMBOL_GPL(of_dma_router_register);
/**
* of_dma_match_channel - Check if a DMA specifier matches name
* @np: device node to look for DMA channels
* @name: channel name to be matched
* @index: index of DMA specifier in list of DMA specifiers
* @dma_spec: pointer to DMA specifier as found in the device tree
*
* Check if the DMA specifier pointed to by the index in a list of DMA
* specifiers, matches the name provided. Returns 0 if the name matches and
* a valid pointer to the DMA specifier is found. Otherwise returns -ENODEV.
*/
static int of_dma_match_channel(struct device_node *np, const char *name,
int index, struct of_phandle_args *dma_spec)
{
const char *s;
if (of_property_read_string_index(np, "dma-names", index, &s))
return -ENODEV;
if (strcmp(name, s))
return -ENODEV;
if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
dma_spec))
return -ENODEV;
return 0;
}
/**
* of_dma_request_slave_channel - Get the DMA slave channel
* @np: device node to get DMA request from
* @name: name of desired channel
*
* Returns pointer to appropriate DMA channel on success or an error pointer.
*/
struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
const char *name)
{
struct of_phandle_args dma_spec;
struct of_dma *ofdma;
struct dma_chan *chan;
int count, i, start;
int ret_no_channel = -ENODEV;
static atomic_t last_index;
if (!np || !name) {
pr_err("%s: not enough information provided\n", __func__);
return ERR_PTR(-ENODEV);
}
/* Silently fail if there is not even the "dmas" property */
if (!of_property_present(np, "dmas"))
return ERR_PTR(-ENODEV);
count = of_property_count_strings(np, "dma-names");
if (count < 0) {
pr_err("%s: dma-names property of node '%pOF' missing or empty\n",
__func__, np);
return ERR_PTR(-ENODEV);
}
/*
* approximate an average distribution across multiple
* entries with the same name
*/
start = atomic_inc_return(&last_index);
for (i = 0; i < count; i++) {
if (of_dma_match_channel(np, name,
(i + start) % count,
&dma_spec))
continue;
mutex_lock(&of_dma_lock);
ofdma = of_dma_find_controller(&dma_spec);
if (ofdma) {
chan = ofdma->of_dma_xlate(&dma_spec, ofdma);
} else {
ret_no_channel = -EPROBE_DEFER;
chan = NULL;
}
mutex_unlock(&of_dma_lock);
of_node_put(dma_spec.np);
if (chan)
return chan;
}
return ERR_PTR(ret_no_channel);
}
EXPORT_SYMBOL_GPL(of_dma_request_slave_channel);
/**
* of_dma_simple_xlate - Simple DMA engine translation function
* @dma_spec: pointer to DMA specifier as found in the device tree
* @ofdma: pointer to DMA controller data
*
* A simple translation function for devices that use a 32-bit value for the
* filter_param when calling the DMA engine dma_request_channel() function.
* Note that this translation function requires that #dma-cells is equal to 1
* and the argument of the dma specifier is the 32-bit filter_param. Returns
* pointer to appropriate dma channel on success or NULL on error.
*/
struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
int count = dma_spec->args_count;
struct of_dma_filter_info *info = ofdma->of_dma_data;
if (!info || !info->filter_fn)
return NULL;
if (count != 1)
return NULL;
return __dma_request_channel(&info->dma_cap, info->filter_fn,
&dma_spec->args[0], dma_spec->np);
}
EXPORT_SYMBOL_GPL(of_dma_simple_xlate);
/**
* of_dma_xlate_by_chan_id - Translate dt property to DMA channel by channel id
* @dma_spec: pointer to DMA specifier as found in the device tree
* @ofdma: pointer to DMA controller data
*
* This function can be used as the of xlate callback for DMA driver which wants
* to match the channel based on the channel id. When using this xlate function
* the #dma-cells propety of the DMA controller dt node needs to be set to 1.
* The data parameter of of_dma_controller_register must be a pointer to the
* dma_device struct the function should match upon.
*
* Returns pointer to appropriate dma channel on success or NULL on error.
*/
struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct dma_device *dev = ofdma->of_dma_data;
struct dma_chan *chan, *candidate = NULL;
if (!dev || dma_spec->args_count != 1)
return NULL;
list_for_each_entry(chan, &dev->channels, device_node)
if (chan->chan_id == dma_spec->args[0]) {
candidate = chan;
break;
}
if (!candidate)
return NULL;
return dma_get_slave_channel(candidate);
}
EXPORT_SYMBOL_GPL(of_dma_xlate_by_chan_id);
| linux-master | drivers/dma/of-dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* offload engine driver for the Marvell XOR engine
* Copyright (C) 2007, 2008, Marvell International Ltd.
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/memory.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/irqdomain.h>
#include <linux/cpumask.h>
#include <linux/platform_data/dma-mv_xor.h>
#include "dmaengine.h"
#include "mv_xor.h"
enum mv_xor_type {
XOR_ORION,
XOR_ARMADA_38X,
XOR_ARMADA_37XX,
};
enum mv_xor_mode {
XOR_MODE_IN_REG,
XOR_MODE_IN_DESC,
};
static void mv_xor_issue_pending(struct dma_chan *chan);
#define to_mv_xor_chan(chan) \
container_of(chan, struct mv_xor_chan, dmachan)
#define to_mv_xor_slot(tx) \
container_of(tx, struct mv_xor_desc_slot, async_tx)
#define mv_chan_to_devp(chan) \
((chan)->dmadev.dev)
static void mv_desc_init(struct mv_xor_desc_slot *desc,
dma_addr_t addr, u32 byte_count,
enum dma_ctrl_flags flags)
{
struct mv_xor_desc *hw_desc = desc->hw_desc;
hw_desc->status = XOR_DESC_DMA_OWNED;
hw_desc->phy_next_desc = 0;
/* Enable end-of-descriptor interrupts only for DMA_PREP_INTERRUPT */
hw_desc->desc_command = (flags & DMA_PREP_INTERRUPT) ?
XOR_DESC_EOD_INT_EN : 0;
hw_desc->phy_dest_addr = addr;
hw_desc->byte_count = byte_count;
}
static void mv_desc_set_mode(struct mv_xor_desc_slot *desc)
{
struct mv_xor_desc *hw_desc = desc->hw_desc;
switch (desc->type) {
case DMA_XOR:
case DMA_INTERRUPT:
hw_desc->desc_command |= XOR_DESC_OPERATION_XOR;
break;
case DMA_MEMCPY:
hw_desc->desc_command |= XOR_DESC_OPERATION_MEMCPY;
break;
default:
BUG();
return;
}
}
static void mv_desc_set_next_desc(struct mv_xor_desc_slot *desc,
u32 next_desc_addr)
{
struct mv_xor_desc *hw_desc = desc->hw_desc;
BUG_ON(hw_desc->phy_next_desc);
hw_desc->phy_next_desc = next_desc_addr;
}
static void mv_desc_set_src_addr(struct mv_xor_desc_slot *desc,
int index, dma_addr_t addr)
{
struct mv_xor_desc *hw_desc = desc->hw_desc;
hw_desc->phy_src_addr[mv_phy_src_idx(index)] = addr;
if (desc->type == DMA_XOR)
hw_desc->desc_command |= (1 << index);
}
static u32 mv_chan_get_current_desc(struct mv_xor_chan *chan)
{
return readl_relaxed(XOR_CURR_DESC(chan));
}
static void mv_chan_set_next_descriptor(struct mv_xor_chan *chan,
u32 next_desc_addr)
{
writel_relaxed(next_desc_addr, XOR_NEXT_DESC(chan));
}
static void mv_chan_unmask_interrupts(struct mv_xor_chan *chan)
{
u32 val = readl_relaxed(XOR_INTR_MASK(chan));
val |= XOR_INTR_MASK_VALUE << (chan->idx * 16);
writel_relaxed(val, XOR_INTR_MASK(chan));
}
static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan)
{
u32 intr_cause = readl_relaxed(XOR_INTR_CAUSE(chan));
intr_cause = (intr_cause >> (chan->idx * 16)) & 0xFFFF;
return intr_cause;
}
static void mv_chan_clear_eoc_cause(struct mv_xor_chan *chan)
{
u32 val;
val = XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | XOR_INT_STOPPED;
val = ~(val << (chan->idx * 16));
dev_dbg(mv_chan_to_devp(chan), "%s, val 0x%08x\n", __func__, val);
writel_relaxed(val, XOR_INTR_CAUSE(chan));
}
static void mv_chan_clear_err_status(struct mv_xor_chan *chan)
{
u32 val = 0xFFFF0000 >> (chan->idx * 16);
writel_relaxed(val, XOR_INTR_CAUSE(chan));
}
static void mv_chan_set_mode(struct mv_xor_chan *chan,
u32 op_mode)
{
u32 config = readl_relaxed(XOR_CONFIG(chan));
config &= ~0x7;
config |= op_mode;
#if defined(__BIG_ENDIAN)
config |= XOR_DESCRIPTOR_SWAP;
#else
config &= ~XOR_DESCRIPTOR_SWAP;
#endif
writel_relaxed(config, XOR_CONFIG(chan));
}
static void mv_chan_activate(struct mv_xor_chan *chan)
{
dev_dbg(mv_chan_to_devp(chan), " activate chan.\n");
/* writel ensures all descriptors are flushed before activation */
writel(BIT(0), XOR_ACTIVATION(chan));
}
static char mv_chan_is_busy(struct mv_xor_chan *chan)
{
u32 state = readl_relaxed(XOR_ACTIVATION(chan));
state = (state >> 4) & 0x3;
return (state == 1) ? 1 : 0;
}
/*
* mv_chan_start_new_chain - program the engine to operate on new
* chain headed by sw_desc
* Caller must hold &mv_chan->lock while calling this function
*/
static void mv_chan_start_new_chain(struct mv_xor_chan *mv_chan,
struct mv_xor_desc_slot *sw_desc)
{
dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: sw_desc %p\n",
__func__, __LINE__, sw_desc);
/* set the hardware chain */
mv_chan_set_next_descriptor(mv_chan, sw_desc->async_tx.phys);
mv_chan->pending++;
mv_xor_issue_pending(&mv_chan->dmachan);
}
static dma_cookie_t
mv_desc_run_tx_complete_actions(struct mv_xor_desc_slot *desc,
struct mv_xor_chan *mv_chan,
dma_cookie_t cookie)
{
BUG_ON(desc->async_tx.cookie < 0);
if (desc->async_tx.cookie > 0) {
cookie = desc->async_tx.cookie;
dma_descriptor_unmap(&desc->async_tx);
/* call the callback (must not sleep or submit new
* operations to this channel)
*/
dmaengine_desc_get_callback_invoke(&desc->async_tx, NULL);
}
/* run dependent operations */
dma_run_dependencies(&desc->async_tx);
return cookie;
}
static int
mv_chan_clean_completed_slots(struct mv_xor_chan *mv_chan)
{
struct mv_xor_desc_slot *iter, *_iter;
dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__);
list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
node) {
if (async_tx_test_ack(&iter->async_tx)) {
list_move_tail(&iter->node, &mv_chan->free_slots);
if (!list_empty(&iter->sg_tx_list)) {
list_splice_tail_init(&iter->sg_tx_list,
&mv_chan->free_slots);
}
}
}
return 0;
}
static int
mv_desc_clean_slot(struct mv_xor_desc_slot *desc,
struct mv_xor_chan *mv_chan)
{
dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: desc %p flags %d\n",
__func__, __LINE__, desc, desc->async_tx.flags);
/* the client is allowed to attach dependent operations
* until 'ack' is set
*/
if (!async_tx_test_ack(&desc->async_tx)) {
/* move this slot to the completed_slots */
list_move_tail(&desc->node, &mv_chan->completed_slots);
if (!list_empty(&desc->sg_tx_list)) {
list_splice_tail_init(&desc->sg_tx_list,
&mv_chan->completed_slots);
}
} else {
list_move_tail(&desc->node, &mv_chan->free_slots);
if (!list_empty(&desc->sg_tx_list)) {
list_splice_tail_init(&desc->sg_tx_list,
&mv_chan->free_slots);
}
}
return 0;
}
/* This function must be called with the mv_xor_chan spinlock held */
static void mv_chan_slot_cleanup(struct mv_xor_chan *mv_chan)
{
struct mv_xor_desc_slot *iter, *_iter;
dma_cookie_t cookie = 0;
int busy = mv_chan_is_busy(mv_chan);
u32 current_desc = mv_chan_get_current_desc(mv_chan);
int current_cleaned = 0;
struct mv_xor_desc *hw_desc;
dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__);
dev_dbg(mv_chan_to_devp(mv_chan), "current_desc %x\n", current_desc);
mv_chan_clean_completed_slots(mv_chan);
/* free completed slots from the chain starting with
* the oldest descriptor
*/
list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
node) {
/* clean finished descriptors */
hw_desc = iter->hw_desc;
if (hw_desc->status & XOR_DESC_SUCCESS) {
cookie = mv_desc_run_tx_complete_actions(iter, mv_chan,
cookie);
/* done processing desc, clean slot */
mv_desc_clean_slot(iter, mv_chan);
/* break if we did cleaned the current */
if (iter->async_tx.phys == current_desc) {
current_cleaned = 1;
break;
}
} else {
if (iter->async_tx.phys == current_desc) {
current_cleaned = 0;
break;
}
}
}
if ((busy == 0) && !list_empty(&mv_chan->chain)) {
if (current_cleaned) {
/*
* current descriptor cleaned and removed, run
* from list head
*/
iter = list_entry(mv_chan->chain.next,
struct mv_xor_desc_slot,
node);
mv_chan_start_new_chain(mv_chan, iter);
} else {
if (!list_is_last(&iter->node, &mv_chan->chain)) {
/*
* descriptors are still waiting after
* current, trigger them
*/
iter = list_entry(iter->node.next,
struct mv_xor_desc_slot,
node);
mv_chan_start_new_chain(mv_chan, iter);
} else {
/*
* some descriptors are still waiting
* to be cleaned
*/
tasklet_schedule(&mv_chan->irq_tasklet);
}
}
}
if (cookie > 0)
mv_chan->dmachan.completed_cookie = cookie;
}
static void mv_xor_tasklet(struct tasklet_struct *t)
{
struct mv_xor_chan *chan = from_tasklet(chan, t, irq_tasklet);
spin_lock(&chan->lock);
mv_chan_slot_cleanup(chan);
spin_unlock(&chan->lock);
}
static struct mv_xor_desc_slot *
mv_chan_alloc_slot(struct mv_xor_chan *mv_chan)
{
struct mv_xor_desc_slot *iter;
spin_lock_bh(&mv_chan->lock);
if (!list_empty(&mv_chan->free_slots)) {
iter = list_first_entry(&mv_chan->free_slots,
struct mv_xor_desc_slot,
node);
list_move_tail(&iter->node, &mv_chan->allocated_slots);
spin_unlock_bh(&mv_chan->lock);
/* pre-ack descriptor */
async_tx_ack(&iter->async_tx);
iter->async_tx.cookie = -EBUSY;
return iter;
}
spin_unlock_bh(&mv_chan->lock);
/* try to free some slots if the allocation fails */
tasklet_schedule(&mv_chan->irq_tasklet);
return NULL;
}
/************************ DMA engine API functions ****************************/
static dma_cookie_t
mv_xor_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct mv_xor_desc_slot *sw_desc = to_mv_xor_slot(tx);
struct mv_xor_chan *mv_chan = to_mv_xor_chan(tx->chan);
struct mv_xor_desc_slot *old_chain_tail;
dma_cookie_t cookie;
int new_hw_chain = 1;
dev_dbg(mv_chan_to_devp(mv_chan),
"%s sw_desc %p: async_tx %p\n",
__func__, sw_desc, &sw_desc->async_tx);
spin_lock_bh(&mv_chan->lock);
cookie = dma_cookie_assign(tx);
if (list_empty(&mv_chan->chain))
list_move_tail(&sw_desc->node, &mv_chan->chain);
else {
new_hw_chain = 0;
old_chain_tail = list_entry(mv_chan->chain.prev,
struct mv_xor_desc_slot,
node);
list_move_tail(&sw_desc->node, &mv_chan->chain);
dev_dbg(mv_chan_to_devp(mv_chan), "Append to last desc %pa\n",
&old_chain_tail->async_tx.phys);
/* fix up the hardware chain */
mv_desc_set_next_desc(old_chain_tail, sw_desc->async_tx.phys);
/* if the channel is not busy */
if (!mv_chan_is_busy(mv_chan)) {
u32 current_desc = mv_chan_get_current_desc(mv_chan);
/*
* and the curren desc is the end of the chain before
* the append, then we need to start the channel
*/
if (current_desc == old_chain_tail->async_tx.phys)
new_hw_chain = 1;
}
}
if (new_hw_chain)
mv_chan_start_new_chain(mv_chan, sw_desc);
spin_unlock_bh(&mv_chan->lock);
return cookie;
}
/* returns the number of allocated descriptors */
static int mv_xor_alloc_chan_resources(struct dma_chan *chan)
{
void *virt_desc;
dma_addr_t dma_desc;
int idx;
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
struct mv_xor_desc_slot *slot = NULL;
int num_descs_in_pool = MV_XOR_POOL_SIZE/MV_XOR_SLOT_SIZE;
/* Allocate descriptor slots */
idx = mv_chan->slots_allocated;
while (idx < num_descs_in_pool) {
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot) {
dev_info(mv_chan_to_devp(mv_chan),
"channel only initialized %d descriptor slots",
idx);
break;
}
virt_desc = mv_chan->dma_desc_pool_virt;
slot->hw_desc = virt_desc + idx * MV_XOR_SLOT_SIZE;
dma_async_tx_descriptor_init(&slot->async_tx, chan);
slot->async_tx.tx_submit = mv_xor_tx_submit;
INIT_LIST_HEAD(&slot->node);
INIT_LIST_HEAD(&slot->sg_tx_list);
dma_desc = mv_chan->dma_desc_pool;
slot->async_tx.phys = dma_desc + idx * MV_XOR_SLOT_SIZE;
slot->idx = idx++;
spin_lock_bh(&mv_chan->lock);
mv_chan->slots_allocated = idx;
list_add_tail(&slot->node, &mv_chan->free_slots);
spin_unlock_bh(&mv_chan->lock);
}
dev_dbg(mv_chan_to_devp(mv_chan),
"allocated %d descriptor slots\n",
mv_chan->slots_allocated);
return mv_chan->slots_allocated ? : -ENOMEM;
}
/*
* Check if source or destination is an PCIe/IO address (non-SDRAM) and add
* a new MBus window if necessary. Use a cache for these check so that
* the MMIO mapped registers don't have to be accessed for this check
* to speed up this process.
*/
static int mv_xor_add_io_win(struct mv_xor_chan *mv_chan, u32 addr)
{
struct mv_xor_device *xordev = mv_chan->xordev;
void __iomem *base = mv_chan->mmr_high_base;
u32 win_enable;
u32 size;
u8 target, attr;
int ret;
int i;
/* Nothing needs to get done for the Armada 3700 */
if (xordev->xor_type == XOR_ARMADA_37XX)
return 0;
/*
* Loop over the cached windows to check, if the requested area
* is already mapped. If this the case, nothing needs to be done
* and we can return.
*/
for (i = 0; i < WINDOW_COUNT; i++) {
if (addr >= xordev->win_start[i] &&
addr <= xordev->win_end[i]) {
/* Window is already mapped */
return 0;
}
}
/*
* The window is not mapped, so we need to create the new mapping
*/
/* If no IO window is found that addr has to be located in SDRAM */
ret = mvebu_mbus_get_io_win_info(addr, &size, &target, &attr);
if (ret < 0)
return 0;
/*
* Mask the base addr 'addr' according to 'size' read back from the
* MBus window. Otherwise we might end up with an address located
* somewhere in the middle of this area here.
*/
size -= 1;
addr &= ~size;
/*
* Reading one of both enabled register is enough, as they are always
* programmed to the identical values
*/
win_enable = readl(base + WINDOW_BAR_ENABLE(0));
/* Set 'i' to the first free window to write the new values to */
i = ffs(~win_enable) - 1;
if (i >= WINDOW_COUNT)
return -ENOMEM;
writel((addr & 0xffff0000) | (attr << 8) | target,
base + WINDOW_BASE(i));
writel(size & 0xffff0000, base + WINDOW_SIZE(i));
/* Fill the caching variables for later use */
xordev->win_start[i] = addr;
xordev->win_end[i] = addr + size;
win_enable |= (1 << i);
win_enable |= 3 << (16 + (2 * i));
writel(win_enable, base + WINDOW_BAR_ENABLE(0));
writel(win_enable, base + WINDOW_BAR_ENABLE(1));
return 0;
}
static struct dma_async_tx_descriptor *
mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
unsigned int src_cnt, size_t len, unsigned long flags)
{
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
struct mv_xor_desc_slot *sw_desc;
int ret;
if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
return NULL;
BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
dev_dbg(mv_chan_to_devp(mv_chan),
"%s src_cnt: %d len: %zu dest %pad flags: %ld\n",
__func__, src_cnt, len, &dest, flags);
/* Check if a new window needs to get added for 'dest' */
ret = mv_xor_add_io_win(mv_chan, dest);
if (ret)
return NULL;
sw_desc = mv_chan_alloc_slot(mv_chan);
if (sw_desc) {
sw_desc->type = DMA_XOR;
sw_desc->async_tx.flags = flags;
mv_desc_init(sw_desc, dest, len, flags);
if (mv_chan->op_in_desc == XOR_MODE_IN_DESC)
mv_desc_set_mode(sw_desc);
while (src_cnt--) {
/* Check if a new window needs to get added for 'src' */
ret = mv_xor_add_io_win(mv_chan, src[src_cnt]);
if (ret)
return NULL;
mv_desc_set_src_addr(sw_desc, src_cnt, src[src_cnt]);
}
}
dev_dbg(mv_chan_to_devp(mv_chan),
"%s sw_desc %p async_tx %p \n",
__func__, sw_desc, &sw_desc->async_tx);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static struct dma_async_tx_descriptor *
mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
/*
* A MEMCPY operation is identical to an XOR operation with only
* a single source address.
*/
return mv_xor_prep_dma_xor(chan, dest, &src, 1, len, flags);
}
static struct dma_async_tx_descriptor *
mv_xor_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
{
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
dma_addr_t src, dest;
size_t len;
src = mv_chan->dummy_src_addr;
dest = mv_chan->dummy_dst_addr;
len = MV_XOR_MIN_BYTE_COUNT;
/*
* We implement the DMA_INTERRUPT operation as a minimum sized
* XOR operation with a single dummy source address.
*/
return mv_xor_prep_dma_xor(chan, dest, &src, 1, len, flags);
}
static void mv_xor_free_chan_resources(struct dma_chan *chan)
{
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
struct mv_xor_desc_slot *iter, *_iter;
int in_use_descs = 0;
spin_lock_bh(&mv_chan->lock);
mv_chan_slot_cleanup(mv_chan);
list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
node) {
in_use_descs++;
list_move_tail(&iter->node, &mv_chan->free_slots);
}
list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
node) {
in_use_descs++;
list_move_tail(&iter->node, &mv_chan->free_slots);
}
list_for_each_entry_safe(iter, _iter, &mv_chan->allocated_slots,
node) {
in_use_descs++;
list_move_tail(&iter->node, &mv_chan->free_slots);
}
list_for_each_entry_safe_reverse(
iter, _iter, &mv_chan->free_slots, node) {
list_del(&iter->node);
kfree(iter);
mv_chan->slots_allocated--;
}
dev_dbg(mv_chan_to_devp(mv_chan), "%s slots_allocated %d\n",
__func__, mv_chan->slots_allocated);
spin_unlock_bh(&mv_chan->lock);
if (in_use_descs)
dev_err(mv_chan_to_devp(mv_chan),
"freeing %d in use descriptors!\n", in_use_descs);
}
/**
* mv_xor_status - poll the status of an XOR transaction
* @chan: XOR channel handle
* @cookie: XOR transaction identifier
* @txstate: XOR transactions state holder (or NULL)
*/
static enum dma_status mv_xor_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
enum dma_status ret;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
spin_lock_bh(&mv_chan->lock);
mv_chan_slot_cleanup(mv_chan);
spin_unlock_bh(&mv_chan->lock);
return dma_cookie_status(chan, cookie, txstate);
}
static void mv_chan_dump_regs(struct mv_xor_chan *chan)
{
u32 val;
val = readl_relaxed(XOR_CONFIG(chan));
dev_err(mv_chan_to_devp(chan), "config 0x%08x\n", val);
val = readl_relaxed(XOR_ACTIVATION(chan));
dev_err(mv_chan_to_devp(chan), "activation 0x%08x\n", val);
val = readl_relaxed(XOR_INTR_CAUSE(chan));
dev_err(mv_chan_to_devp(chan), "intr cause 0x%08x\n", val);
val = readl_relaxed(XOR_INTR_MASK(chan));
dev_err(mv_chan_to_devp(chan), "intr mask 0x%08x\n", val);
val = readl_relaxed(XOR_ERROR_CAUSE(chan));
dev_err(mv_chan_to_devp(chan), "error cause 0x%08x\n", val);
val = readl_relaxed(XOR_ERROR_ADDR(chan));
dev_err(mv_chan_to_devp(chan), "error addr 0x%08x\n", val);
}
static void mv_chan_err_interrupt_handler(struct mv_xor_chan *chan,
u32 intr_cause)
{
if (intr_cause & XOR_INT_ERR_DECODE) {
dev_dbg(mv_chan_to_devp(chan), "ignoring address decode error\n");
return;
}
dev_err(mv_chan_to_devp(chan), "error on chan %d. intr cause 0x%08x\n",
chan->idx, intr_cause);
mv_chan_dump_regs(chan);
WARN_ON(1);
}
static irqreturn_t mv_xor_interrupt_handler(int irq, void *data)
{
struct mv_xor_chan *chan = data;
u32 intr_cause = mv_chan_get_intr_cause(chan);
dev_dbg(mv_chan_to_devp(chan), "intr cause %x\n", intr_cause);
if (intr_cause & XOR_INTR_ERRORS)
mv_chan_err_interrupt_handler(chan, intr_cause);
tasklet_schedule(&chan->irq_tasklet);
mv_chan_clear_eoc_cause(chan);
return IRQ_HANDLED;
}
static void mv_xor_issue_pending(struct dma_chan *chan)
{
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
if (mv_chan->pending >= MV_XOR_THRESHOLD) {
mv_chan->pending = 0;
mv_chan_activate(mv_chan);
}
}
/*
* Perform a transaction to verify the HW works.
*/
static int mv_chan_memcpy_self_test(struct mv_xor_chan *mv_chan)
{
int i, ret;
void *src, *dest;
dma_addr_t src_dma, dest_dma;
struct dma_chan *dma_chan;
dma_cookie_t cookie;
struct dma_async_tx_descriptor *tx;
struct dmaengine_unmap_data *unmap;
int err = 0;
src = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!src)
return -ENOMEM;
dest = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (!dest) {
kfree(src);
return -ENOMEM;
}
/* Fill in src buffer */
for (i = 0; i < PAGE_SIZE; i++)
((u8 *) src)[i] = (u8)i;
dma_chan = &mv_chan->dmachan;
if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
err = -ENODEV;
goto out;
}
unmap = dmaengine_get_unmap_data(dma_chan->device->dev, 2, GFP_KERNEL);
if (!unmap) {
err = -ENOMEM;
goto free_resources;
}
src_dma = dma_map_page(dma_chan->device->dev, virt_to_page(src),
offset_in_page(src), PAGE_SIZE,
DMA_TO_DEVICE);
unmap->addr[0] = src_dma;
ret = dma_mapping_error(dma_chan->device->dev, src_dma);
if (ret) {
err = -ENOMEM;
goto free_resources;
}
unmap->to_cnt = 1;
dest_dma = dma_map_page(dma_chan->device->dev, virt_to_page(dest),
offset_in_page(dest), PAGE_SIZE,
DMA_FROM_DEVICE);
unmap->addr[1] = dest_dma;
ret = dma_mapping_error(dma_chan->device->dev, dest_dma);
if (ret) {
err = -ENOMEM;
goto free_resources;
}
unmap->from_cnt = 1;
unmap->len = PAGE_SIZE;
tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
PAGE_SIZE, 0);
if (!tx) {
dev_err(dma_chan->device->dev,
"Self-test cannot prepare operation, disabling\n");
err = -ENODEV;
goto free_resources;
}
cookie = mv_xor_tx_submit(tx);
if (dma_submit_error(cookie)) {
dev_err(dma_chan->device->dev,
"Self-test submit error, disabling\n");
err = -ENODEV;
goto free_resources;
}
mv_xor_issue_pending(dma_chan);
async_tx_ack(tx);
msleep(1);
if (mv_xor_status(dma_chan, cookie, NULL) !=
DMA_COMPLETE) {
dev_err(dma_chan->device->dev,
"Self-test copy timed out, disabling\n");
err = -ENODEV;
goto free_resources;
}
dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma,
PAGE_SIZE, DMA_FROM_DEVICE);
if (memcmp(src, dest, PAGE_SIZE)) {
dev_err(dma_chan->device->dev,
"Self-test copy failed compare, disabling\n");
err = -ENODEV;
goto free_resources;
}
free_resources:
dmaengine_unmap_put(unmap);
mv_xor_free_chan_resources(dma_chan);
out:
kfree(src);
kfree(dest);
return err;
}
#define MV_XOR_NUM_SRC_TEST 4 /* must be <= 15 */
static int
mv_chan_xor_self_test(struct mv_xor_chan *mv_chan)
{
int i, src_idx, ret;
struct page *dest;
struct page *xor_srcs[MV_XOR_NUM_SRC_TEST];
dma_addr_t dma_srcs[MV_XOR_NUM_SRC_TEST];
dma_addr_t dest_dma;
struct dma_async_tx_descriptor *tx;
struct dmaengine_unmap_data *unmap;
struct dma_chan *dma_chan;
dma_cookie_t cookie;
u8 cmp_byte = 0;
u32 cmp_word;
int err = 0;
int src_count = MV_XOR_NUM_SRC_TEST;
for (src_idx = 0; src_idx < src_count; src_idx++) {
xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
if (!xor_srcs[src_idx]) {
while (src_idx--)
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
}
dest = alloc_page(GFP_KERNEL);
if (!dest) {
while (src_idx--)
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
/* Fill in src buffers */
for (src_idx = 0; src_idx < src_count; src_idx++) {
u8 *ptr = page_address(xor_srcs[src_idx]);
for (i = 0; i < PAGE_SIZE; i++)
ptr[i] = (1 << src_idx);
}
for (src_idx = 0; src_idx < src_count; src_idx++)
cmp_byte ^= (u8) (1 << src_idx);
cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
(cmp_byte << 8) | cmp_byte;
memset(page_address(dest), 0, PAGE_SIZE);
dma_chan = &mv_chan->dmachan;
if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
err = -ENODEV;
goto out;
}
unmap = dmaengine_get_unmap_data(dma_chan->device->dev, src_count + 1,
GFP_KERNEL);
if (!unmap) {
err = -ENOMEM;
goto free_resources;
}
/* test xor */
for (i = 0; i < src_count; i++) {
unmap->addr[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
0, PAGE_SIZE, DMA_TO_DEVICE);
dma_srcs[i] = unmap->addr[i];
ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[i]);
if (ret) {
err = -ENOMEM;
goto free_resources;
}
unmap->to_cnt++;
}
unmap->addr[src_count] = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE,
DMA_FROM_DEVICE);
dest_dma = unmap->addr[src_count];
ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[src_count]);
if (ret) {
err = -ENOMEM;
goto free_resources;
}
unmap->from_cnt = 1;
unmap->len = PAGE_SIZE;
tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
src_count, PAGE_SIZE, 0);
if (!tx) {
dev_err(dma_chan->device->dev,
"Self-test cannot prepare operation, disabling\n");
err = -ENODEV;
goto free_resources;
}
cookie = mv_xor_tx_submit(tx);
if (dma_submit_error(cookie)) {
dev_err(dma_chan->device->dev,
"Self-test submit error, disabling\n");
err = -ENODEV;
goto free_resources;
}
mv_xor_issue_pending(dma_chan);
async_tx_ack(tx);
msleep(8);
if (mv_xor_status(dma_chan, cookie, NULL) !=
DMA_COMPLETE) {
dev_err(dma_chan->device->dev,
"Self-test xor timed out, disabling\n");
err = -ENODEV;
goto free_resources;
}
dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma,
PAGE_SIZE, DMA_FROM_DEVICE);
for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
u32 *ptr = page_address(dest);
if (ptr[i] != cmp_word) {
dev_err(dma_chan->device->dev,
"Self-test xor failed compare, disabling. index %d, data %x, expected %x\n",
i, ptr[i], cmp_word);
err = -ENODEV;
goto free_resources;
}
}
free_resources:
dmaengine_unmap_put(unmap);
mv_xor_free_chan_resources(dma_chan);
out:
src_idx = src_count;
while (src_idx--)
__free_page(xor_srcs[src_idx]);
__free_page(dest);
return err;
}
static int mv_xor_channel_remove(struct mv_xor_chan *mv_chan)
{
struct dma_chan *chan, *_chan;
struct device *dev = mv_chan->dmadev.dev;
dma_async_device_unregister(&mv_chan->dmadev);
dma_free_coherent(dev, MV_XOR_POOL_SIZE,
mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool);
dma_unmap_single(dev, mv_chan->dummy_src_addr,
MV_XOR_MIN_BYTE_COUNT, DMA_FROM_DEVICE);
dma_unmap_single(dev, mv_chan->dummy_dst_addr,
MV_XOR_MIN_BYTE_COUNT, DMA_TO_DEVICE);
list_for_each_entry_safe(chan, _chan, &mv_chan->dmadev.channels,
device_node) {
list_del(&chan->device_node);
}
free_irq(mv_chan->irq, mv_chan);
return 0;
}
static struct mv_xor_chan *
mv_xor_channel_add(struct mv_xor_device *xordev,
struct platform_device *pdev,
int idx, dma_cap_mask_t cap_mask, int irq)
{
int ret = 0;
struct mv_xor_chan *mv_chan;
struct dma_device *dma_dev;
mv_chan = devm_kzalloc(&pdev->dev, sizeof(*mv_chan), GFP_KERNEL);
if (!mv_chan)
return ERR_PTR(-ENOMEM);
mv_chan->idx = idx;
mv_chan->irq = irq;
if (xordev->xor_type == XOR_ORION)
mv_chan->op_in_desc = XOR_MODE_IN_REG;
else
mv_chan->op_in_desc = XOR_MODE_IN_DESC;
dma_dev = &mv_chan->dmadev;
dma_dev->dev = &pdev->dev;
mv_chan->xordev = xordev;
/*
* These source and destination dummy buffers are used to implement
* a DMA_INTERRUPT operation as a minimum-sized XOR operation.
* Hence, we only need to map the buffers at initialization-time.
*/
mv_chan->dummy_src_addr = dma_map_single(dma_dev->dev,
mv_chan->dummy_src, MV_XOR_MIN_BYTE_COUNT, DMA_FROM_DEVICE);
mv_chan->dummy_dst_addr = dma_map_single(dma_dev->dev,
mv_chan->dummy_dst, MV_XOR_MIN_BYTE_COUNT, DMA_TO_DEVICE);
/* allocate coherent memory for hardware descriptors
* note: writecombine gives slightly better performance, but
* requires that we explicitly flush the writes
*/
mv_chan->dma_desc_pool_virt =
dma_alloc_wc(&pdev->dev, MV_XOR_POOL_SIZE, &mv_chan->dma_desc_pool,
GFP_KERNEL);
if (!mv_chan->dma_desc_pool_virt)
return ERR_PTR(-ENOMEM);
/* discover transaction capabilites from the platform data */
dma_dev->cap_mask = cap_mask;
INIT_LIST_HEAD(&dma_dev->channels);
/* set base routines */
dma_dev->device_alloc_chan_resources = mv_xor_alloc_chan_resources;
dma_dev->device_free_chan_resources = mv_xor_free_chan_resources;
dma_dev->device_tx_status = mv_xor_status;
dma_dev->device_issue_pending = mv_xor_issue_pending;
/* set prep routines based on capability */
if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
dma_dev->device_prep_dma_interrupt = mv_xor_prep_dma_interrupt;
if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
dma_dev->device_prep_dma_memcpy = mv_xor_prep_dma_memcpy;
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
dma_dev->max_xor = 8;
dma_dev->device_prep_dma_xor = mv_xor_prep_dma_xor;
}
mv_chan->mmr_base = xordev->xor_base;
mv_chan->mmr_high_base = xordev->xor_high_base;
tasklet_setup(&mv_chan->irq_tasklet, mv_xor_tasklet);
/* clear errors before enabling interrupts */
mv_chan_clear_err_status(mv_chan);
ret = request_irq(mv_chan->irq, mv_xor_interrupt_handler,
0, dev_name(&pdev->dev), mv_chan);
if (ret)
goto err_free_dma;
mv_chan_unmask_interrupts(mv_chan);
if (mv_chan->op_in_desc == XOR_MODE_IN_DESC)
mv_chan_set_mode(mv_chan, XOR_OPERATION_MODE_IN_DESC);
else
mv_chan_set_mode(mv_chan, XOR_OPERATION_MODE_XOR);
spin_lock_init(&mv_chan->lock);
INIT_LIST_HEAD(&mv_chan->chain);
INIT_LIST_HEAD(&mv_chan->completed_slots);
INIT_LIST_HEAD(&mv_chan->free_slots);
INIT_LIST_HEAD(&mv_chan->allocated_slots);
mv_chan->dmachan.device = dma_dev;
dma_cookie_init(&mv_chan->dmachan);
list_add_tail(&mv_chan->dmachan.device_node, &dma_dev->channels);
if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
ret = mv_chan_memcpy_self_test(mv_chan);
dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
if (ret)
goto err_free_irq;
}
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
ret = mv_chan_xor_self_test(mv_chan);
dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
if (ret)
goto err_free_irq;
}
dev_info(&pdev->dev, "Marvell XOR (%s): ( %s%s%s)\n",
mv_chan->op_in_desc ? "Descriptor Mode" : "Registers Mode",
dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
ret = dma_async_device_register(dma_dev);
if (ret)
goto err_free_irq;
return mv_chan;
err_free_irq:
free_irq(mv_chan->irq, mv_chan);
err_free_dma:
dma_free_coherent(&pdev->dev, MV_XOR_POOL_SIZE,
mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool);
return ERR_PTR(ret);
}
static void
mv_xor_conf_mbus_windows(struct mv_xor_device *xordev,
const struct mbus_dram_target_info *dram)
{
void __iomem *base = xordev->xor_high_base;
u32 win_enable = 0;
int i;
for (i = 0; i < 8; i++) {
writel(0, base + WINDOW_BASE(i));
writel(0, base + WINDOW_SIZE(i));
if (i < 4)
writel(0, base + WINDOW_REMAP_HIGH(i));
}
for (i = 0; i < dram->num_cs; i++) {
const struct mbus_dram_window *cs = dram->cs + i;
writel((cs->base & 0xffff0000) |
(cs->mbus_attr << 8) |
dram->mbus_dram_target_id, base + WINDOW_BASE(i));
writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i));
/* Fill the caching variables for later use */
xordev->win_start[i] = cs->base;
xordev->win_end[i] = cs->base + cs->size - 1;
win_enable |= (1 << i);
win_enable |= 3 << (16 + (2 * i));
}
writel(win_enable, base + WINDOW_BAR_ENABLE(0));
writel(win_enable, base + WINDOW_BAR_ENABLE(1));
writel(0, base + WINDOW_OVERRIDE_CTRL(0));
writel(0, base + WINDOW_OVERRIDE_CTRL(1));
}
static void
mv_xor_conf_mbus_windows_a3700(struct mv_xor_device *xordev)
{
void __iomem *base = xordev->xor_high_base;
u32 win_enable = 0;
int i;
for (i = 0; i < 8; i++) {
writel(0, base + WINDOW_BASE(i));
writel(0, base + WINDOW_SIZE(i));
if (i < 4)
writel(0, base + WINDOW_REMAP_HIGH(i));
}
/*
* For Armada3700 open default 4GB Mbus window. The dram
* related configuration are done at AXIS level.
*/
writel(0xffff0000, base + WINDOW_SIZE(0));
win_enable |= 1;
win_enable |= 3 << 16;
writel(win_enable, base + WINDOW_BAR_ENABLE(0));
writel(win_enable, base + WINDOW_BAR_ENABLE(1));
writel(0, base + WINDOW_OVERRIDE_CTRL(0));
writel(0, base + WINDOW_OVERRIDE_CTRL(1));
}
/*
* Since this XOR driver is basically used only for RAID5, we don't
* need to care about synchronizing ->suspend with DMA activity,
* because the DMA engine will naturally be quiet due to the block
* devices being suspended.
*/
static int mv_xor_suspend(struct platform_device *pdev, pm_message_t state)
{
struct mv_xor_device *xordev = platform_get_drvdata(pdev);
int i;
for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
struct mv_xor_chan *mv_chan = xordev->channels[i];
if (!mv_chan)
continue;
mv_chan->saved_config_reg =
readl_relaxed(XOR_CONFIG(mv_chan));
mv_chan->saved_int_mask_reg =
readl_relaxed(XOR_INTR_MASK(mv_chan));
}
return 0;
}
static int mv_xor_resume(struct platform_device *dev)
{
struct mv_xor_device *xordev = platform_get_drvdata(dev);
const struct mbus_dram_target_info *dram;
int i;
for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
struct mv_xor_chan *mv_chan = xordev->channels[i];
if (!mv_chan)
continue;
writel_relaxed(mv_chan->saved_config_reg,
XOR_CONFIG(mv_chan));
writel_relaxed(mv_chan->saved_int_mask_reg,
XOR_INTR_MASK(mv_chan));
}
if (xordev->xor_type == XOR_ARMADA_37XX) {
mv_xor_conf_mbus_windows_a3700(xordev);
return 0;
}
dram = mv_mbus_dram_info();
if (dram)
mv_xor_conf_mbus_windows(xordev, dram);
return 0;
}
static const struct of_device_id mv_xor_dt_ids[] = {
{ .compatible = "marvell,orion-xor", .data = (void *)XOR_ORION },
{ .compatible = "marvell,armada-380-xor", .data = (void *)XOR_ARMADA_38X },
{ .compatible = "marvell,armada-3700-xor", .data = (void *)XOR_ARMADA_37XX },
{},
};
static unsigned int mv_xor_engine_count;
static int mv_xor_probe(struct platform_device *pdev)
{
const struct mbus_dram_target_info *dram;
struct mv_xor_device *xordev;
struct mv_xor_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct resource *res;
unsigned int max_engines, max_channels;
int i, ret;
dev_notice(&pdev->dev, "Marvell shared XOR driver\n");
xordev = devm_kzalloc(&pdev->dev, sizeof(*xordev), GFP_KERNEL);
if (!xordev)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
xordev->xor_base = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!xordev->xor_base)
return -EBUSY;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res)
return -ENODEV;
xordev->xor_high_base = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!xordev->xor_high_base)
return -EBUSY;
platform_set_drvdata(pdev, xordev);
/*
* We need to know which type of XOR device we use before
* setting up. In non-dt case it can only be the legacy one.
*/
xordev->xor_type = XOR_ORION;
if (pdev->dev.of_node) {
const struct of_device_id *of_id =
of_match_device(mv_xor_dt_ids,
&pdev->dev);
xordev->xor_type = (uintptr_t)of_id->data;
}
/*
* (Re-)program MBUS remapping windows if we are asked to.
*/
if (xordev->xor_type == XOR_ARMADA_37XX) {
mv_xor_conf_mbus_windows_a3700(xordev);
} else {
dram = mv_mbus_dram_info();
if (dram)
mv_xor_conf_mbus_windows(xordev, dram);
}
/* Not all platforms can gate the clock, so it is not
* an error if the clock does not exists.
*/
xordev->clk = clk_get(&pdev->dev, NULL);
if (!IS_ERR(xordev->clk))
clk_prepare_enable(xordev->clk);
/*
* We don't want to have more than one channel per CPU in
* order for async_tx to perform well. So we limit the number
* of engines and channels so that we take into account this
* constraint. Note that we also want to use channels from
* separate engines when possible. For dual-CPU Armada 3700
* SoC with single XOR engine allow using its both channels.
*/
max_engines = num_present_cpus();
if (xordev->xor_type == XOR_ARMADA_37XX)
max_channels = num_present_cpus();
else
max_channels = min_t(unsigned int,
MV_XOR_MAX_CHANNELS,
DIV_ROUND_UP(num_present_cpus(), 2));
if (mv_xor_engine_count >= max_engines)
return 0;
if (pdev->dev.of_node) {
struct device_node *np;
int i = 0;
for_each_child_of_node(pdev->dev.of_node, np) {
struct mv_xor_chan *chan;
dma_cap_mask_t cap_mask;
int irq;
if (i >= max_channels)
continue;
dma_cap_zero(cap_mask);
dma_cap_set(DMA_MEMCPY, cap_mask);
dma_cap_set(DMA_XOR, cap_mask);
dma_cap_set(DMA_INTERRUPT, cap_mask);
irq = irq_of_parse_and_map(np, 0);
if (!irq) {
ret = -ENODEV;
goto err_channel_add;
}
chan = mv_xor_channel_add(xordev, pdev, i,
cap_mask, irq);
if (IS_ERR(chan)) {
ret = PTR_ERR(chan);
irq_dispose_mapping(irq);
goto err_channel_add;
}
xordev->channels[i] = chan;
i++;
}
} else if (pdata && pdata->channels) {
for (i = 0; i < max_channels; i++) {
struct mv_xor_channel_data *cd;
struct mv_xor_chan *chan;
int irq;
cd = &pdata->channels[i];
irq = platform_get_irq(pdev, i);
if (irq < 0) {
ret = irq;
goto err_channel_add;
}
chan = mv_xor_channel_add(xordev, pdev, i,
cd->cap_mask, irq);
if (IS_ERR(chan)) {
ret = PTR_ERR(chan);
goto err_channel_add;
}
xordev->channels[i] = chan;
}
}
return 0;
err_channel_add:
for (i = 0; i < MV_XOR_MAX_CHANNELS; i++)
if (xordev->channels[i]) {
mv_xor_channel_remove(xordev->channels[i]);
if (pdev->dev.of_node)
irq_dispose_mapping(xordev->channels[i]->irq);
}
if (!IS_ERR(xordev->clk)) {
clk_disable_unprepare(xordev->clk);
clk_put(xordev->clk);
}
return ret;
}
static struct platform_driver mv_xor_driver = {
.probe = mv_xor_probe,
.suspend = mv_xor_suspend,
.resume = mv_xor_resume,
.driver = {
.name = MV_XOR_NAME,
.of_match_table = mv_xor_dt_ids,
},
};
builtin_platform_driver(mv_xor_driver);
/*
MODULE_AUTHOR("Saeed Bishara <[email protected]>");
MODULE_DESCRIPTION("DMA engine driver for Marvell's XOR engine");
MODULE_LICENSE("GPL");
*/
| linux-master | drivers/dma/mv_xor.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2013-2014 Allwinner Tech Co., Ltd
* Author: Sugar <[email protected]>
*
* Copyright (C) 2014 Maxime Ripard
* Maxime Ripard <[email protected]>
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "virt-dma.h"
/*
* Common registers
*/
#define DMA_IRQ_EN(x) ((x) * 0x04)
#define DMA_IRQ_HALF BIT(0)
#define DMA_IRQ_PKG BIT(1)
#define DMA_IRQ_QUEUE BIT(2)
#define DMA_IRQ_CHAN_NR 8
#define DMA_IRQ_CHAN_WIDTH 4
#define DMA_IRQ_STAT(x) ((x) * 0x04 + 0x10)
#define DMA_STAT 0x30
/* Offset between DMA_IRQ_EN and DMA_IRQ_STAT limits number of channels */
#define DMA_MAX_CHANNELS (DMA_IRQ_CHAN_NR * 0x10 / 4)
/*
* sun8i specific registers
*/
#define SUN8I_DMA_GATE 0x20
#define SUN8I_DMA_GATE_ENABLE 0x4
#define SUNXI_H3_SECURE_REG 0x20
#define SUNXI_H3_DMA_GATE 0x28
#define SUNXI_H3_DMA_GATE_ENABLE 0x4
/*
* Channels specific registers
*/
#define DMA_CHAN_ENABLE 0x00
#define DMA_CHAN_ENABLE_START BIT(0)
#define DMA_CHAN_ENABLE_STOP 0
#define DMA_CHAN_PAUSE 0x04
#define DMA_CHAN_PAUSE_PAUSE BIT(1)
#define DMA_CHAN_PAUSE_RESUME 0
#define DMA_CHAN_LLI_ADDR 0x08
#define DMA_CHAN_CUR_CFG 0x0c
#define DMA_CHAN_MAX_DRQ_A31 0x1f
#define DMA_CHAN_MAX_DRQ_H6 0x3f
#define DMA_CHAN_CFG_SRC_DRQ_A31(x) ((x) & DMA_CHAN_MAX_DRQ_A31)
#define DMA_CHAN_CFG_SRC_DRQ_H6(x) ((x) & DMA_CHAN_MAX_DRQ_H6)
#define DMA_CHAN_CFG_SRC_MODE_A31(x) (((x) & 0x1) << 5)
#define DMA_CHAN_CFG_SRC_MODE_H6(x) (((x) & 0x1) << 8)
#define DMA_CHAN_CFG_SRC_BURST_A31(x) (((x) & 0x3) << 7)
#define DMA_CHAN_CFG_SRC_BURST_H3(x) (((x) & 0x3) << 6)
#define DMA_CHAN_CFG_SRC_WIDTH(x) (((x) & 0x3) << 9)
#define DMA_CHAN_CFG_DST_DRQ_A31(x) (DMA_CHAN_CFG_SRC_DRQ_A31(x) << 16)
#define DMA_CHAN_CFG_DST_DRQ_H6(x) (DMA_CHAN_CFG_SRC_DRQ_H6(x) << 16)
#define DMA_CHAN_CFG_DST_MODE_A31(x) (DMA_CHAN_CFG_SRC_MODE_A31(x) << 16)
#define DMA_CHAN_CFG_DST_MODE_H6(x) (DMA_CHAN_CFG_SRC_MODE_H6(x) << 16)
#define DMA_CHAN_CFG_DST_BURST_A31(x) (DMA_CHAN_CFG_SRC_BURST_A31(x) << 16)
#define DMA_CHAN_CFG_DST_BURST_H3(x) (DMA_CHAN_CFG_SRC_BURST_H3(x) << 16)
#define DMA_CHAN_CFG_DST_WIDTH(x) (DMA_CHAN_CFG_SRC_WIDTH(x) << 16)
#define DMA_CHAN_CUR_SRC 0x10
#define DMA_CHAN_CUR_DST 0x14
#define DMA_CHAN_CUR_CNT 0x18
#define DMA_CHAN_CUR_PARA 0x1c
/*
* LLI address mangling
*
* The LLI link physical address is also mangled, but we avoid dealing
* with that by allocating LLIs from the DMA32 zone.
*/
#define SRC_HIGH_ADDR(x) (((x) & 0x3U) << 16)
#define DST_HIGH_ADDR(x) (((x) & 0x3U) << 18)
/*
* Various hardware related defines
*/
#define LLI_LAST_ITEM 0xfffff800
#define NORMAL_WAIT 8
#define DRQ_SDRAM 1
#define LINEAR_MODE 0
#define IO_MODE 1
/* forward declaration */
struct sun6i_dma_dev;
/*
* Hardware channels / ports representation
*
* The hardware is used in several SoCs, with differing numbers
* of channels and endpoints. This structure ties those numbers
* to a certain compatible string.
*/
struct sun6i_dma_config {
u32 nr_max_channels;
u32 nr_max_requests;
u32 nr_max_vchans;
/*
* In the datasheets/user manuals of newer Allwinner SoCs, a special
* bit (bit 2 at register 0x20) is present.
* It's named "DMA MCLK interface circuit auto gating bit" in the
* documents, and the footnote of this register says that this bit
* should be set up when initializing the DMA controller.
* Allwinner A23/A33 user manuals do not have this bit documented,
* however these SoCs really have and need this bit, as seen in the
* BSP kernel source code.
*/
void (*clock_autogate_enable)(struct sun6i_dma_dev *);
void (*set_burst_length)(u32 *p_cfg, s8 src_burst, s8 dst_burst);
void (*set_drq)(u32 *p_cfg, s8 src_drq, s8 dst_drq);
void (*set_mode)(u32 *p_cfg, s8 src_mode, s8 dst_mode);
u32 src_burst_lengths;
u32 dst_burst_lengths;
u32 src_addr_widths;
u32 dst_addr_widths;
bool has_high_addr;
bool has_mbus_clk;
};
/*
* Hardware representation of the LLI
*
* The hardware will be fed the physical address of this structure,
* and read its content in order to start the transfer.
*/
struct sun6i_dma_lli {
u32 cfg;
u32 src;
u32 dst;
u32 len;
u32 para;
u32 p_lli_next;
/*
* This field is not used by the DMA controller, but will be
* used by the CPU to go through the list (mostly for dumping
* or freeing it).
*/
struct sun6i_dma_lli *v_lli_next;
};
struct sun6i_desc {
struct virt_dma_desc vd;
dma_addr_t p_lli;
struct sun6i_dma_lli *v_lli;
};
struct sun6i_pchan {
u32 idx;
void __iomem *base;
struct sun6i_vchan *vchan;
struct sun6i_desc *desc;
struct sun6i_desc *done;
};
struct sun6i_vchan {
struct virt_dma_chan vc;
struct list_head node;
struct dma_slave_config cfg;
struct sun6i_pchan *phy;
u8 port;
u8 irq_type;
bool cyclic;
};
struct sun6i_dma_dev {
struct dma_device slave;
void __iomem *base;
struct clk *clk;
struct clk *clk_mbus;
int irq;
spinlock_t lock;
struct reset_control *rstc;
struct tasklet_struct task;
atomic_t tasklet_shutdown;
struct list_head pending;
struct dma_pool *pool;
struct sun6i_pchan *pchans;
struct sun6i_vchan *vchans;
const struct sun6i_dma_config *cfg;
u32 num_pchans;
u32 num_vchans;
u32 max_request;
};
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static inline struct sun6i_dma_dev *to_sun6i_dma_dev(struct dma_device *d)
{
return container_of(d, struct sun6i_dma_dev, slave);
}
static inline struct sun6i_vchan *to_sun6i_vchan(struct dma_chan *chan)
{
return container_of(chan, struct sun6i_vchan, vc.chan);
}
static inline struct sun6i_desc *
to_sun6i_desc(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct sun6i_desc, vd.tx);
}
static inline void sun6i_dma_dump_com_regs(struct sun6i_dma_dev *sdev)
{
dev_dbg(sdev->slave.dev, "Common register:\n"
"\tmask0(%04x): 0x%08x\n"
"\tmask1(%04x): 0x%08x\n"
"\tpend0(%04x): 0x%08x\n"
"\tpend1(%04x): 0x%08x\n"
"\tstats(%04x): 0x%08x\n",
DMA_IRQ_EN(0), readl(sdev->base + DMA_IRQ_EN(0)),
DMA_IRQ_EN(1), readl(sdev->base + DMA_IRQ_EN(1)),
DMA_IRQ_STAT(0), readl(sdev->base + DMA_IRQ_STAT(0)),
DMA_IRQ_STAT(1), readl(sdev->base + DMA_IRQ_STAT(1)),
DMA_STAT, readl(sdev->base + DMA_STAT));
}
static inline void sun6i_dma_dump_chan_regs(struct sun6i_dma_dev *sdev,
struct sun6i_pchan *pchan)
{
dev_dbg(sdev->slave.dev, "Chan %d reg:\n"
"\t___en(%04x): \t0x%08x\n"
"\tpause(%04x): \t0x%08x\n"
"\tstart(%04x): \t0x%08x\n"
"\t__cfg(%04x): \t0x%08x\n"
"\t__src(%04x): \t0x%08x\n"
"\t__dst(%04x): \t0x%08x\n"
"\tcount(%04x): \t0x%08x\n"
"\t_para(%04x): \t0x%08x\n\n",
pchan->idx,
DMA_CHAN_ENABLE,
readl(pchan->base + DMA_CHAN_ENABLE),
DMA_CHAN_PAUSE,
readl(pchan->base + DMA_CHAN_PAUSE),
DMA_CHAN_LLI_ADDR,
readl(pchan->base + DMA_CHAN_LLI_ADDR),
DMA_CHAN_CUR_CFG,
readl(pchan->base + DMA_CHAN_CUR_CFG),
DMA_CHAN_CUR_SRC,
readl(pchan->base + DMA_CHAN_CUR_SRC),
DMA_CHAN_CUR_DST,
readl(pchan->base + DMA_CHAN_CUR_DST),
DMA_CHAN_CUR_CNT,
readl(pchan->base + DMA_CHAN_CUR_CNT),
DMA_CHAN_CUR_PARA,
readl(pchan->base + DMA_CHAN_CUR_PARA));
}
static inline s8 convert_burst(u32 maxburst)
{
switch (maxburst) {
case 1:
return 0;
case 4:
return 1;
case 8:
return 2;
case 16:
return 3;
default:
return -EINVAL;
}
}
static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
{
return ilog2(addr_width);
}
static void sun6i_enable_clock_autogate_a23(struct sun6i_dma_dev *sdev)
{
writel(SUN8I_DMA_GATE_ENABLE, sdev->base + SUN8I_DMA_GATE);
}
static void sun6i_enable_clock_autogate_h3(struct sun6i_dma_dev *sdev)
{
writel(SUNXI_H3_DMA_GATE_ENABLE, sdev->base + SUNXI_H3_DMA_GATE);
}
static void sun6i_set_burst_length_a31(u32 *p_cfg, s8 src_burst, s8 dst_burst)
{
*p_cfg |= DMA_CHAN_CFG_SRC_BURST_A31(src_burst) |
DMA_CHAN_CFG_DST_BURST_A31(dst_burst);
}
static void sun6i_set_burst_length_h3(u32 *p_cfg, s8 src_burst, s8 dst_burst)
{
*p_cfg |= DMA_CHAN_CFG_SRC_BURST_H3(src_burst) |
DMA_CHAN_CFG_DST_BURST_H3(dst_burst);
}
static void sun6i_set_drq_a31(u32 *p_cfg, s8 src_drq, s8 dst_drq)
{
*p_cfg |= DMA_CHAN_CFG_SRC_DRQ_A31(src_drq) |
DMA_CHAN_CFG_DST_DRQ_A31(dst_drq);
}
static void sun6i_set_drq_h6(u32 *p_cfg, s8 src_drq, s8 dst_drq)
{
*p_cfg |= DMA_CHAN_CFG_SRC_DRQ_H6(src_drq) |
DMA_CHAN_CFG_DST_DRQ_H6(dst_drq);
}
static void sun6i_set_mode_a31(u32 *p_cfg, s8 src_mode, s8 dst_mode)
{
*p_cfg |= DMA_CHAN_CFG_SRC_MODE_A31(src_mode) |
DMA_CHAN_CFG_DST_MODE_A31(dst_mode);
}
static void sun6i_set_mode_h6(u32 *p_cfg, s8 src_mode, s8 dst_mode)
{
*p_cfg |= DMA_CHAN_CFG_SRC_MODE_H6(src_mode) |
DMA_CHAN_CFG_DST_MODE_H6(dst_mode);
}
static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
{
struct sun6i_desc *txd = pchan->desc;
struct sun6i_dma_lli *lli;
size_t bytes;
dma_addr_t pos;
pos = readl(pchan->base + DMA_CHAN_LLI_ADDR);
bytes = readl(pchan->base + DMA_CHAN_CUR_CNT);
if (pos == LLI_LAST_ITEM)
return bytes;
for (lli = txd->v_lli; lli; lli = lli->v_lli_next) {
if (lli->p_lli_next == pos) {
for (lli = lli->v_lli_next; lli; lli = lli->v_lli_next)
bytes += lli->len;
break;
}
}
return bytes;
}
static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev,
struct sun6i_dma_lli *next,
dma_addr_t next_phy,
struct sun6i_desc *txd)
{
if ((!prev && !txd) || !next)
return NULL;
if (!prev) {
txd->p_lli = next_phy;
txd->v_lli = next;
} else {
prev->p_lli_next = next_phy;
prev->v_lli_next = next;
}
next->p_lli_next = LLI_LAST_ITEM;
next->v_lli_next = NULL;
return next;
}
static inline void sun6i_dma_dump_lli(struct sun6i_vchan *vchan,
struct sun6i_dma_lli *v_lli,
dma_addr_t p_lli)
{
dev_dbg(chan2dev(&vchan->vc.chan),
"\n\tdesc:\tp - %pad v - 0x%p\n"
"\t\tc - 0x%08x s - 0x%08x d - 0x%08x\n"
"\t\tl - 0x%08x p - 0x%08x n - 0x%08x\n",
&p_lli, v_lli,
v_lli->cfg, v_lli->src, v_lli->dst,
v_lli->len, v_lli->para, v_lli->p_lli_next);
}
static void sun6i_dma_free_desc(struct virt_dma_desc *vd)
{
struct sun6i_desc *txd = to_sun6i_desc(&vd->tx);
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vd->tx.chan->device);
struct sun6i_dma_lli *v_lli, *v_next;
dma_addr_t p_lli, p_next;
if (unlikely(!txd))
return;
p_lli = txd->p_lli;
v_lli = txd->v_lli;
while (v_lli) {
v_next = v_lli->v_lli_next;
p_next = v_lli->p_lli_next;
dma_pool_free(sdev->pool, v_lli, p_lli);
v_lli = v_next;
p_lli = p_next;
}
kfree(txd);
}
static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vchan->vc.chan.device);
struct virt_dma_desc *desc = vchan_next_desc(&vchan->vc);
struct sun6i_pchan *pchan = vchan->phy;
u32 irq_val, irq_reg, irq_offset;
if (!pchan)
return -EAGAIN;
if (!desc) {
pchan->desc = NULL;
pchan->done = NULL;
return -EAGAIN;
}
list_del(&desc->node);
pchan->desc = to_sun6i_desc(&desc->tx);
pchan->done = NULL;
sun6i_dma_dump_lli(vchan, pchan->desc->v_lli, pchan->desc->p_lli);
irq_reg = pchan->idx / DMA_IRQ_CHAN_NR;
irq_offset = pchan->idx % DMA_IRQ_CHAN_NR;
vchan->irq_type = vchan->cyclic ? DMA_IRQ_PKG : DMA_IRQ_QUEUE;
irq_val = readl(sdev->base + DMA_IRQ_EN(irq_reg));
irq_val &= ~((DMA_IRQ_HALF | DMA_IRQ_PKG | DMA_IRQ_QUEUE) <<
(irq_offset * DMA_IRQ_CHAN_WIDTH));
irq_val |= vchan->irq_type << (irq_offset * DMA_IRQ_CHAN_WIDTH);
writel(irq_val, sdev->base + DMA_IRQ_EN(irq_reg));
writel(pchan->desc->p_lli, pchan->base + DMA_CHAN_LLI_ADDR);
writel(DMA_CHAN_ENABLE_START, pchan->base + DMA_CHAN_ENABLE);
sun6i_dma_dump_com_regs(sdev);
sun6i_dma_dump_chan_regs(sdev, pchan);
return 0;
}
static void sun6i_dma_tasklet(struct tasklet_struct *t)
{
struct sun6i_dma_dev *sdev = from_tasklet(sdev, t, task);
struct sun6i_vchan *vchan;
struct sun6i_pchan *pchan;
unsigned int pchan_alloc = 0;
unsigned int pchan_idx;
list_for_each_entry(vchan, &sdev->slave.channels, vc.chan.device_node) {
spin_lock_irq(&vchan->vc.lock);
pchan = vchan->phy;
if (pchan && pchan->done) {
if (sun6i_dma_start_desc(vchan)) {
/*
* No current txd associated with this channel
*/
dev_dbg(sdev->slave.dev, "pchan %u: free\n",
pchan->idx);
/* Mark this channel free */
vchan->phy = NULL;
pchan->vchan = NULL;
}
}
spin_unlock_irq(&vchan->vc.lock);
}
spin_lock_irq(&sdev->lock);
for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
pchan = &sdev->pchans[pchan_idx];
if (pchan->vchan || list_empty(&sdev->pending))
continue;
vchan = list_first_entry(&sdev->pending,
struct sun6i_vchan, node);
/* Remove from pending channels */
list_del_init(&vchan->node);
pchan_alloc |= BIT(pchan_idx);
/* Mark this channel allocated */
pchan->vchan = vchan;
vchan->phy = pchan;
dev_dbg(sdev->slave.dev, "pchan %u: alloc vchan %p\n",
pchan->idx, &vchan->vc);
}
spin_unlock_irq(&sdev->lock);
for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
if (!(pchan_alloc & BIT(pchan_idx)))
continue;
pchan = sdev->pchans + pchan_idx;
vchan = pchan->vchan;
if (vchan) {
spin_lock_irq(&vchan->vc.lock);
sun6i_dma_start_desc(vchan);
spin_unlock_irq(&vchan->vc.lock);
}
}
}
static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
{
struct sun6i_dma_dev *sdev = dev_id;
struct sun6i_vchan *vchan;
struct sun6i_pchan *pchan;
int i, j, ret = IRQ_NONE;
u32 status;
for (i = 0; i < sdev->num_pchans / DMA_IRQ_CHAN_NR; i++) {
status = readl(sdev->base + DMA_IRQ_STAT(i));
if (!status)
continue;
dev_dbg(sdev->slave.dev, "DMA irq status %s: 0x%x\n",
i ? "high" : "low", status);
writel(status, sdev->base + DMA_IRQ_STAT(i));
for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) {
pchan = sdev->pchans + j;
vchan = pchan->vchan;
if (vchan && (status & vchan->irq_type)) {
if (vchan->cyclic) {
vchan_cyclic_callback(&pchan->desc->vd);
} else {
spin_lock(&vchan->vc.lock);
vchan_cookie_complete(&pchan->desc->vd);
pchan->done = pchan->desc;
spin_unlock(&vchan->vc.lock);
}
}
status = status >> DMA_IRQ_CHAN_WIDTH;
}
if (!atomic_read(&sdev->tasklet_shutdown))
tasklet_schedule(&sdev->task);
ret = IRQ_HANDLED;
}
return ret;
}
static int set_config(struct sun6i_dma_dev *sdev,
struct dma_slave_config *sconfig,
enum dma_transfer_direction direction,
u32 *p_cfg)
{
enum dma_slave_buswidth src_addr_width, dst_addr_width;
u32 src_maxburst, dst_maxburst;
s8 src_width, dst_width, src_burst, dst_burst;
src_addr_width = sconfig->src_addr_width;
dst_addr_width = sconfig->dst_addr_width;
src_maxburst = sconfig->src_maxburst;
dst_maxburst = sconfig->dst_maxburst;
switch (direction) {
case DMA_MEM_TO_DEV:
if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
src_maxburst = src_maxburst ? src_maxburst : 8;
break;
case DMA_DEV_TO_MEM:
if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
dst_maxburst = dst_maxburst ? dst_maxburst : 8;
break;
default:
return -EINVAL;
}
if (!(BIT(src_addr_width) & sdev->slave.src_addr_widths))
return -EINVAL;
if (!(BIT(dst_addr_width) & sdev->slave.dst_addr_widths))
return -EINVAL;
if (!(BIT(src_maxburst) & sdev->cfg->src_burst_lengths))
return -EINVAL;
if (!(BIT(dst_maxburst) & sdev->cfg->dst_burst_lengths))
return -EINVAL;
src_width = convert_buswidth(src_addr_width);
dst_width = convert_buswidth(dst_addr_width);
dst_burst = convert_burst(dst_maxburst);
src_burst = convert_burst(src_maxburst);
*p_cfg = DMA_CHAN_CFG_SRC_WIDTH(src_width) |
DMA_CHAN_CFG_DST_WIDTH(dst_width);
sdev->cfg->set_burst_length(p_cfg, src_burst, dst_burst);
return 0;
}
static inline void sun6i_dma_set_addr(struct sun6i_dma_dev *sdev,
struct sun6i_dma_lli *v_lli,
dma_addr_t src, dma_addr_t dst)
{
v_lli->src = lower_32_bits(src);
v_lli->dst = lower_32_bits(dst);
if (sdev->cfg->has_high_addr)
v_lli->para |= SRC_HIGH_ADDR(upper_32_bits(src)) |
DST_HIGH_ADDR(upper_32_bits(dst));
}
static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_dma_lli *v_lli;
struct sun6i_desc *txd;
dma_addr_t p_lli;
s8 burst, width;
dev_dbg(chan2dev(chan),
"%s; chan: %d, dest: %pad, src: %pad, len: %zu. flags: 0x%08lx\n",
__func__, vchan->vc.chan.chan_id, &dest, &src, len, flags);
if (!len)
return NULL;
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (!txd)
return NULL;
v_lli = dma_pool_alloc(sdev->pool, GFP_DMA32 | GFP_NOWAIT, &p_lli);
if (!v_lli) {
dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
goto err_txd_free;
}
v_lli->len = len;
v_lli->para = NORMAL_WAIT;
sun6i_dma_set_addr(sdev, v_lli, src, dest);
burst = convert_burst(8);
width = convert_buswidth(DMA_SLAVE_BUSWIDTH_4_BYTES);
v_lli->cfg = DMA_CHAN_CFG_SRC_WIDTH(width) |
DMA_CHAN_CFG_DST_WIDTH(width);
sdev->cfg->set_burst_length(&v_lli->cfg, burst, burst);
sdev->cfg->set_drq(&v_lli->cfg, DRQ_SDRAM, DRQ_SDRAM);
sdev->cfg->set_mode(&v_lli->cfg, LINEAR_MODE, LINEAR_MODE);
sun6i_dma_lli_add(NULL, v_lli, p_lli, txd);
sun6i_dma_dump_lli(vchan, v_lli, p_lli);
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_txd_free:
kfree(txd);
return NULL;
}
static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct dma_slave_config *sconfig = &vchan->cfg;
struct sun6i_dma_lli *v_lli, *prev = NULL;
struct sun6i_desc *txd;
struct scatterlist *sg;
dma_addr_t p_lli;
u32 lli_cfg;
int i, ret;
if (!sgl)
return NULL;
ret = set_config(sdev, sconfig, dir, &lli_cfg);
if (ret) {
dev_err(chan2dev(chan), "Invalid DMA configuration\n");
return NULL;
}
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (!txd)
return NULL;
for_each_sg(sgl, sg, sg_len, i) {
v_lli = dma_pool_alloc(sdev->pool, GFP_DMA32 | GFP_NOWAIT, &p_lli);
if (!v_lli)
goto err_lli_free;
v_lli->len = sg_dma_len(sg);
v_lli->para = NORMAL_WAIT;
if (dir == DMA_MEM_TO_DEV) {
sun6i_dma_set_addr(sdev, v_lli,
sg_dma_address(sg),
sconfig->dst_addr);
v_lli->cfg = lli_cfg;
sdev->cfg->set_drq(&v_lli->cfg, DRQ_SDRAM, vchan->port);
sdev->cfg->set_mode(&v_lli->cfg, LINEAR_MODE, IO_MODE);
dev_dbg(chan2dev(chan),
"%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
__func__, vchan->vc.chan.chan_id,
&sconfig->dst_addr, &sg_dma_address(sg),
sg_dma_len(sg), flags);
} else {
sun6i_dma_set_addr(sdev, v_lli,
sconfig->src_addr,
sg_dma_address(sg));
v_lli->cfg = lli_cfg;
sdev->cfg->set_drq(&v_lli->cfg, vchan->port, DRQ_SDRAM);
sdev->cfg->set_mode(&v_lli->cfg, IO_MODE, LINEAR_MODE);
dev_dbg(chan2dev(chan),
"%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
__func__, vchan->vc.chan.chan_id,
&sg_dma_address(sg), &sconfig->src_addr,
sg_dma_len(sg), flags);
}
prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
}
dev_dbg(chan2dev(chan), "First: %pad\n", &txd->p_lli);
for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli;
p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next)
sun6i_dma_dump_lli(vchan, v_lli, p_lli);
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_lli_free:
for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli;
p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next)
dma_pool_free(sdev->pool, v_lli, p_lli);
kfree(txd);
return NULL;
}
static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_cyclic(
struct dma_chan *chan,
dma_addr_t buf_addr,
size_t buf_len,
size_t period_len,
enum dma_transfer_direction dir,
unsigned long flags)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct dma_slave_config *sconfig = &vchan->cfg;
struct sun6i_dma_lli *v_lli, *prev = NULL;
struct sun6i_desc *txd;
dma_addr_t p_lli;
u32 lli_cfg;
unsigned int i, periods = buf_len / period_len;
int ret;
ret = set_config(sdev, sconfig, dir, &lli_cfg);
if (ret) {
dev_err(chan2dev(chan), "Invalid DMA configuration\n");
return NULL;
}
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (!txd)
return NULL;
for (i = 0; i < periods; i++) {
v_lli = dma_pool_alloc(sdev->pool, GFP_DMA32 | GFP_NOWAIT, &p_lli);
if (!v_lli) {
dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
goto err_lli_free;
}
v_lli->len = period_len;
v_lli->para = NORMAL_WAIT;
if (dir == DMA_MEM_TO_DEV) {
sun6i_dma_set_addr(sdev, v_lli,
buf_addr + period_len * i,
sconfig->dst_addr);
v_lli->cfg = lli_cfg;
sdev->cfg->set_drq(&v_lli->cfg, DRQ_SDRAM, vchan->port);
sdev->cfg->set_mode(&v_lli->cfg, LINEAR_MODE, IO_MODE);
} else {
sun6i_dma_set_addr(sdev, v_lli,
sconfig->src_addr,
buf_addr + period_len * i);
v_lli->cfg = lli_cfg;
sdev->cfg->set_drq(&v_lli->cfg, vchan->port, DRQ_SDRAM);
sdev->cfg->set_mode(&v_lli->cfg, IO_MODE, LINEAR_MODE);
}
prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
}
prev->p_lli_next = txd->p_lli; /* cyclic list */
vchan->cyclic = true;
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_lli_free:
for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli;
p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next)
dma_pool_free(sdev->pool, v_lli, p_lli);
kfree(txd);
return NULL;
}
static int sun6i_dma_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
memcpy(&vchan->cfg, config, sizeof(*config));
return 0;
}
static int sun6i_dma_pause(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_pchan *pchan = vchan->phy;
dev_dbg(chan2dev(chan), "vchan %p: pause\n", &vchan->vc);
if (pchan) {
writel(DMA_CHAN_PAUSE_PAUSE,
pchan->base + DMA_CHAN_PAUSE);
} else {
spin_lock(&sdev->lock);
list_del_init(&vchan->node);
spin_unlock(&sdev->lock);
}
return 0;
}
static int sun6i_dma_resume(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_pchan *pchan = vchan->phy;
unsigned long flags;
dev_dbg(chan2dev(chan), "vchan %p: resume\n", &vchan->vc);
spin_lock_irqsave(&vchan->vc.lock, flags);
if (pchan) {
writel(DMA_CHAN_PAUSE_RESUME,
pchan->base + DMA_CHAN_PAUSE);
} else if (!list_empty(&vchan->vc.desc_issued)) {
spin_lock(&sdev->lock);
list_add_tail(&vchan->node, &sdev->pending);
spin_unlock(&sdev->lock);
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
return 0;
}
static int sun6i_dma_terminate_all(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_pchan *pchan = vchan->phy;
unsigned long flags;
LIST_HEAD(head);
spin_lock(&sdev->lock);
list_del_init(&vchan->node);
spin_unlock(&sdev->lock);
spin_lock_irqsave(&vchan->vc.lock, flags);
if (vchan->cyclic) {
vchan->cyclic = false;
if (pchan && pchan->desc) {
struct virt_dma_desc *vd = &pchan->desc->vd;
struct virt_dma_chan *vc = &vchan->vc;
list_add_tail(&vd->node, &vc->desc_completed);
}
}
vchan_get_all_descriptors(&vchan->vc, &head);
if (pchan) {
writel(DMA_CHAN_ENABLE_STOP, pchan->base + DMA_CHAN_ENABLE);
writel(DMA_CHAN_PAUSE_RESUME, pchan->base + DMA_CHAN_PAUSE);
vchan->phy = NULL;
pchan->vchan = NULL;
pchan->desc = NULL;
pchan->done = NULL;
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
vchan_dma_desc_free_list(&vchan->vc, &head);
return 0;
}
static enum dma_status sun6i_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *state)
{
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_pchan *pchan = vchan->phy;
struct sun6i_dma_lli *lli;
struct virt_dma_desc *vd;
struct sun6i_desc *txd;
enum dma_status ret;
unsigned long flags;
size_t bytes = 0;
ret = dma_cookie_status(chan, cookie, state);
if (ret == DMA_COMPLETE || !state)
return ret;
spin_lock_irqsave(&vchan->vc.lock, flags);
vd = vchan_find_desc(&vchan->vc, cookie);
txd = to_sun6i_desc(&vd->tx);
if (vd) {
for (lli = txd->v_lli; lli != NULL; lli = lli->v_lli_next)
bytes += lli->len;
} else if (!pchan || !pchan->desc) {
bytes = 0;
} else {
bytes = sun6i_get_chan_size(pchan);
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
dma_set_residue(state, bytes);
return ret;
}
static void sun6i_dma_issue_pending(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
unsigned long flags;
spin_lock_irqsave(&vchan->vc.lock, flags);
if (vchan_issue_pending(&vchan->vc)) {
spin_lock(&sdev->lock);
if (!vchan->phy && list_empty(&vchan->node)) {
list_add_tail(&vchan->node, &sdev->pending);
tasklet_schedule(&sdev->task);
dev_dbg(chan2dev(chan), "vchan %p: issued\n",
&vchan->vc);
}
spin_unlock(&sdev->lock);
} else {
dev_dbg(chan2dev(chan), "vchan %p: nothing to issue\n",
&vchan->vc);
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
}
static void sun6i_dma_free_chan_resources(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
unsigned long flags;
spin_lock_irqsave(&sdev->lock, flags);
list_del_init(&vchan->node);
spin_unlock_irqrestore(&sdev->lock, flags);
vchan_free_chan_resources(&vchan->vc);
}
static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct sun6i_dma_dev *sdev = ofdma->of_dma_data;
struct sun6i_vchan *vchan;
struct dma_chan *chan;
u8 port = dma_spec->args[0];
if (port > sdev->max_request)
return NULL;
chan = dma_get_any_slave_channel(&sdev->slave);
if (!chan)
return NULL;
vchan = to_sun6i_vchan(chan);
vchan->port = port;
return chan;
}
static inline void sun6i_kill_tasklet(struct sun6i_dma_dev *sdev)
{
/* Disable all interrupts from DMA */
writel(0, sdev->base + DMA_IRQ_EN(0));
writel(0, sdev->base + DMA_IRQ_EN(1));
/* Prevent spurious interrupts from scheduling the tasklet */
atomic_inc(&sdev->tasklet_shutdown);
/* Make sure we won't have any further interrupts */
devm_free_irq(sdev->slave.dev, sdev->irq, sdev);
/* Actually prevent the tasklet from being scheduled */
tasklet_kill(&sdev->task);
}
static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
{
int i;
for (i = 0; i < sdev->num_vchans; i++) {
struct sun6i_vchan *vchan = &sdev->vchans[i];
list_del(&vchan->vc.chan.device_node);
tasklet_kill(&vchan->vc.task);
}
}
/*
* For A31:
*
* There's 16 physical channels that can work in parallel.
*
* However we have 30 different endpoints for our requests.
*
* Since the channels are able to handle only an unidirectional
* transfer, we need to allocate more virtual channels so that
* everyone can grab one channel.
*
* Some devices can't work in both direction (mostly because it
* wouldn't make sense), so we have a bit fewer virtual channels than
* 2 channels per endpoints.
*/
static struct sun6i_dma_config sun6i_a31_dma_cfg = {
.nr_max_channels = 16,
.nr_max_requests = 30,
.nr_max_vchans = 53,
.set_burst_length = sun6i_set_burst_length_a31,
.set_drq = sun6i_set_drq_a31,
.set_mode = sun6i_set_mode_a31,
.src_burst_lengths = BIT(1) | BIT(8),
.dst_burst_lengths = BIT(1) | BIT(8),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
};
/*
* The A23 only has 8 physical channels, a maximum DRQ port id of 24,
* and a total of 37 usable source and destination endpoints.
*/
static struct sun6i_dma_config sun8i_a23_dma_cfg = {
.nr_max_channels = 8,
.nr_max_requests = 24,
.nr_max_vchans = 37,
.clock_autogate_enable = sun6i_enable_clock_autogate_a23,
.set_burst_length = sun6i_set_burst_length_a31,
.set_drq = sun6i_set_drq_a31,
.set_mode = sun6i_set_mode_a31,
.src_burst_lengths = BIT(1) | BIT(8),
.dst_burst_lengths = BIT(1) | BIT(8),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
};
static struct sun6i_dma_config sun8i_a83t_dma_cfg = {
.nr_max_channels = 8,
.nr_max_requests = 28,
.nr_max_vchans = 39,
.clock_autogate_enable = sun6i_enable_clock_autogate_a23,
.set_burst_length = sun6i_set_burst_length_a31,
.set_drq = sun6i_set_drq_a31,
.set_mode = sun6i_set_mode_a31,
.src_burst_lengths = BIT(1) | BIT(8),
.dst_burst_lengths = BIT(1) | BIT(8),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
};
/*
* The H3 has 12 physical channels, a maximum DRQ port id of 27,
* and a total of 34 usable source and destination endpoints.
* It also supports additional burst lengths and bus widths,
* and the burst length fields have different offsets.
*/
static struct sun6i_dma_config sun8i_h3_dma_cfg = {
.nr_max_channels = 12,
.nr_max_requests = 27,
.nr_max_vchans = 34,
.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
.set_burst_length = sun6i_set_burst_length_h3,
.set_drq = sun6i_set_drq_a31,
.set_mode = sun6i_set_mode_a31,
.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
};
/*
* The A64 binding uses the number of dma channels from the
* device tree node.
*/
static struct sun6i_dma_config sun50i_a64_dma_cfg = {
.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
.set_burst_length = sun6i_set_burst_length_h3,
.set_drq = sun6i_set_drq_a31,
.set_mode = sun6i_set_mode_a31,
.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
};
/*
* The A100 binding uses the number of dma channels from the
* device tree node.
*/
static struct sun6i_dma_config sun50i_a100_dma_cfg = {
.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
.set_burst_length = sun6i_set_burst_length_h3,
.set_drq = sun6i_set_drq_h6,
.set_mode = sun6i_set_mode_h6,
.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
.has_high_addr = true,
.has_mbus_clk = true,
};
/*
* The H6 binding uses the number of dma channels from the
* device tree node.
*/
static struct sun6i_dma_config sun50i_h6_dma_cfg = {
.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
.set_burst_length = sun6i_set_burst_length_h3,
.set_drq = sun6i_set_drq_h6,
.set_mode = sun6i_set_mode_h6,
.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
.has_mbus_clk = true,
};
/*
* The V3s have only 8 physical channels, a maximum DRQ port id of 23,
* and a total of 24 usable source and destination endpoints.
*/
static struct sun6i_dma_config sun8i_v3s_dma_cfg = {
.nr_max_channels = 8,
.nr_max_requests = 23,
.nr_max_vchans = 24,
.clock_autogate_enable = sun6i_enable_clock_autogate_a23,
.set_burst_length = sun6i_set_burst_length_a31,
.set_drq = sun6i_set_drq_a31,
.set_mode = sun6i_set_mode_a31,
.src_burst_lengths = BIT(1) | BIT(8),
.dst_burst_lengths = BIT(1) | BIT(8),
.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
};
static const struct of_device_id sun6i_dma_match[] = {
{ .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
{ .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg },
{ .compatible = "allwinner,sun8i-a83t-dma", .data = &sun8i_a83t_dma_cfg },
{ .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
{ .compatible = "allwinner,sun8i-v3s-dma", .data = &sun8i_v3s_dma_cfg },
{ .compatible = "allwinner,sun20i-d1-dma", .data = &sun50i_a100_dma_cfg },
{ .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },
{ .compatible = "allwinner,sun50i-a100-dma", .data = &sun50i_a100_dma_cfg },
{ .compatible = "allwinner,sun50i-h6-dma", .data = &sun50i_h6_dma_cfg },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sun6i_dma_match);
static int sun6i_dma_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct sun6i_dma_dev *sdc;
int ret, i;
sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL);
if (!sdc)
return -ENOMEM;
sdc->cfg = of_device_get_match_data(&pdev->dev);
if (!sdc->cfg)
return -ENODEV;
sdc->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(sdc->base))
return PTR_ERR(sdc->base);
sdc->irq = platform_get_irq(pdev, 0);
if (sdc->irq < 0)
return sdc->irq;
sdc->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(sdc->clk)) {
dev_err(&pdev->dev, "No clock specified\n");
return PTR_ERR(sdc->clk);
}
if (sdc->cfg->has_mbus_clk) {
sdc->clk_mbus = devm_clk_get(&pdev->dev, "mbus");
if (IS_ERR(sdc->clk_mbus)) {
dev_err(&pdev->dev, "No mbus clock specified\n");
return PTR_ERR(sdc->clk_mbus);
}
}
sdc->rstc = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(sdc->rstc)) {
dev_err(&pdev->dev, "No reset controller specified\n");
return PTR_ERR(sdc->rstc);
}
sdc->pool = dmam_pool_create(dev_name(&pdev->dev), &pdev->dev,
sizeof(struct sun6i_dma_lli), 4, 0);
if (!sdc->pool) {
dev_err(&pdev->dev, "No memory for descriptors dma pool\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, sdc);
INIT_LIST_HEAD(&sdc->pending);
spin_lock_init(&sdc->lock);
dma_set_max_seg_size(&pdev->dev, SZ_32M - 1);
dma_cap_set(DMA_PRIVATE, sdc->slave.cap_mask);
dma_cap_set(DMA_MEMCPY, sdc->slave.cap_mask);
dma_cap_set(DMA_SLAVE, sdc->slave.cap_mask);
dma_cap_set(DMA_CYCLIC, sdc->slave.cap_mask);
INIT_LIST_HEAD(&sdc->slave.channels);
sdc->slave.device_free_chan_resources = sun6i_dma_free_chan_resources;
sdc->slave.device_tx_status = sun6i_dma_tx_status;
sdc->slave.device_issue_pending = sun6i_dma_issue_pending;
sdc->slave.device_prep_slave_sg = sun6i_dma_prep_slave_sg;
sdc->slave.device_prep_dma_memcpy = sun6i_dma_prep_dma_memcpy;
sdc->slave.device_prep_dma_cyclic = sun6i_dma_prep_dma_cyclic;
sdc->slave.copy_align = DMAENGINE_ALIGN_4_BYTES;
sdc->slave.device_config = sun6i_dma_config;
sdc->slave.device_pause = sun6i_dma_pause;
sdc->slave.device_resume = sun6i_dma_resume;
sdc->slave.device_terminate_all = sun6i_dma_terminate_all;
sdc->slave.src_addr_widths = sdc->cfg->src_addr_widths;
sdc->slave.dst_addr_widths = sdc->cfg->dst_addr_widths;
sdc->slave.directions = BIT(DMA_DEV_TO_MEM) |
BIT(DMA_MEM_TO_DEV);
sdc->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
sdc->slave.dev = &pdev->dev;
sdc->num_pchans = sdc->cfg->nr_max_channels;
sdc->num_vchans = sdc->cfg->nr_max_vchans;
sdc->max_request = sdc->cfg->nr_max_requests;
ret = of_property_read_u32(np, "dma-channels", &sdc->num_pchans);
if (ret && !sdc->num_pchans) {
dev_err(&pdev->dev, "Can't get dma-channels.\n");
return ret;
}
ret = of_property_read_u32(np, "dma-requests", &sdc->max_request);
if (ret && !sdc->max_request) {
dev_info(&pdev->dev, "Missing dma-requests, using %u.\n",
DMA_CHAN_MAX_DRQ_A31);
sdc->max_request = DMA_CHAN_MAX_DRQ_A31;
}
/*
* If the number of vchans is not specified, derive it from the
* highest port number, at most one channel per port and direction.
*/
if (!sdc->num_vchans)
sdc->num_vchans = 2 * (sdc->max_request + 1);
sdc->pchans = devm_kcalloc(&pdev->dev, sdc->num_pchans,
sizeof(struct sun6i_pchan), GFP_KERNEL);
if (!sdc->pchans)
return -ENOMEM;
sdc->vchans = devm_kcalloc(&pdev->dev, sdc->num_vchans,
sizeof(struct sun6i_vchan), GFP_KERNEL);
if (!sdc->vchans)
return -ENOMEM;
tasklet_setup(&sdc->task, sun6i_dma_tasklet);
for (i = 0; i < sdc->num_pchans; i++) {
struct sun6i_pchan *pchan = &sdc->pchans[i];
pchan->idx = i;
pchan->base = sdc->base + 0x100 + i * 0x40;
}
for (i = 0; i < sdc->num_vchans; i++) {
struct sun6i_vchan *vchan = &sdc->vchans[i];
INIT_LIST_HEAD(&vchan->node);
vchan->vc.desc_free = sun6i_dma_free_desc;
vchan_init(&vchan->vc, &sdc->slave);
}
ret = reset_control_deassert(sdc->rstc);
if (ret) {
dev_err(&pdev->dev, "Couldn't deassert the device from reset\n");
goto err_chan_free;
}
ret = clk_prepare_enable(sdc->clk);
if (ret) {
dev_err(&pdev->dev, "Couldn't enable the clock\n");
goto err_reset_assert;
}
if (sdc->cfg->has_mbus_clk) {
ret = clk_prepare_enable(sdc->clk_mbus);
if (ret) {
dev_err(&pdev->dev, "Couldn't enable mbus clock\n");
goto err_clk_disable;
}
}
ret = devm_request_irq(&pdev->dev, sdc->irq, sun6i_dma_interrupt, 0,
dev_name(&pdev->dev), sdc);
if (ret) {
dev_err(&pdev->dev, "Cannot request IRQ\n");
goto err_mbus_clk_disable;
}
ret = dma_async_device_register(&sdc->slave);
if (ret) {
dev_warn(&pdev->dev, "Failed to register DMA engine device\n");
goto err_irq_disable;
}
ret = of_dma_controller_register(pdev->dev.of_node, sun6i_dma_of_xlate,
sdc);
if (ret) {
dev_err(&pdev->dev, "of_dma_controller_register failed\n");
goto err_dma_unregister;
}
if (sdc->cfg->clock_autogate_enable)
sdc->cfg->clock_autogate_enable(sdc);
return 0;
err_dma_unregister:
dma_async_device_unregister(&sdc->slave);
err_irq_disable:
sun6i_kill_tasklet(sdc);
err_mbus_clk_disable:
clk_disable_unprepare(sdc->clk_mbus);
err_clk_disable:
clk_disable_unprepare(sdc->clk);
err_reset_assert:
reset_control_assert(sdc->rstc);
err_chan_free:
sun6i_dma_free(sdc);
return ret;
}
static int sun6i_dma_remove(struct platform_device *pdev)
{
struct sun6i_dma_dev *sdc = platform_get_drvdata(pdev);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&sdc->slave);
sun6i_kill_tasklet(sdc);
clk_disable_unprepare(sdc->clk_mbus);
clk_disable_unprepare(sdc->clk);
reset_control_assert(sdc->rstc);
sun6i_dma_free(sdc);
return 0;
}
static struct platform_driver sun6i_dma_driver = {
.probe = sun6i_dma_probe,
.remove = sun6i_dma_remove,
.driver = {
.name = "sun6i-dma",
.of_match_table = sun6i_dma_match,
},
};
module_platform_driver(sun6i_dma_driver);
MODULE_DESCRIPTION("Allwinner A31 DMA Controller Driver");
MODULE_AUTHOR("Sugar <[email protected]>");
MODULE_AUTHOR("Maxime Ripard <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/sun6i-dma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved.
*/
/*
* This code implements the DMA subsystem. It provides a HW-neutral interface
* for other kernel code to use asynchronous memory copy capabilities,
* if present, and allows different HW DMA drivers to register as providing
* this capability.
*
* Due to the fact we are accelerating what is already a relatively fast
* operation, the code goes to great lengths to avoid additional overhead,
* such as locking.
*
* LOCKING:
*
* The subsystem keeps a global list of dma_device structs it is protected by a
* mutex, dma_list_mutex.
*
* A subsystem can get access to a channel by calling dmaengine_get() followed
* by dma_find_channel(), or if it has need for an exclusive channel it can call
* dma_request_channel(). Once a channel is allocated a reference is taken
* against its corresponding driver to disable removal.
*
* Each device has a channels list, which runs unlocked but is never modified
* once the device is registered, it's just setup by the driver.
*
* See Documentation/driver-api/dmaengine for more details
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/hardirq.h>
#include <linux/spinlock.h>
#include <linux/percpu.h>
#include <linux/rcupdate.h>
#include <linux/mutex.h>
#include <linux/jiffies.h>
#include <linux/rculist.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/acpi_dma.h>
#include <linux/of_dma.h>
#include <linux/mempool.h>
#include <linux/numa.h>
#include "dmaengine.h"
static DEFINE_MUTEX(dma_list_mutex);
static DEFINE_IDA(dma_ida);
static LIST_HEAD(dma_device_list);
static long dmaengine_ref_count;
/* --- debugfs implementation --- */
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
static struct dentry *rootdir;
static void dmaengine_debug_register(struct dma_device *dma_dev)
{
dma_dev->dbg_dev_root = debugfs_create_dir(dev_name(dma_dev->dev),
rootdir);
if (IS_ERR(dma_dev->dbg_dev_root))
dma_dev->dbg_dev_root = NULL;
}
static void dmaengine_debug_unregister(struct dma_device *dma_dev)
{
debugfs_remove_recursive(dma_dev->dbg_dev_root);
dma_dev->dbg_dev_root = NULL;
}
static void dmaengine_dbg_summary_show(struct seq_file *s,
struct dma_device *dma_dev)
{
struct dma_chan *chan;
list_for_each_entry(chan, &dma_dev->channels, device_node) {
if (chan->client_count) {
seq_printf(s, " %-13s| %s", dma_chan_name(chan),
chan->dbg_client_name ?: "in-use");
if (chan->router)
seq_printf(s, " (via router: %s)\n",
dev_name(chan->router->dev));
else
seq_puts(s, "\n");
}
}
}
static int dmaengine_summary_show(struct seq_file *s, void *data)
{
struct dma_device *dma_dev = NULL;
mutex_lock(&dma_list_mutex);
list_for_each_entry(dma_dev, &dma_device_list, global_node) {
seq_printf(s, "dma%d (%s): number of channels: %u\n",
dma_dev->dev_id, dev_name(dma_dev->dev),
dma_dev->chancnt);
if (dma_dev->dbg_summary_show)
dma_dev->dbg_summary_show(s, dma_dev);
else
dmaengine_dbg_summary_show(s, dma_dev);
if (!list_is_last(&dma_dev->global_node, &dma_device_list))
seq_puts(s, "\n");
}
mutex_unlock(&dma_list_mutex);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(dmaengine_summary);
static void __init dmaengine_debugfs_init(void)
{
rootdir = debugfs_create_dir("dmaengine", NULL);
/* /sys/kernel/debug/dmaengine/summary */
debugfs_create_file("summary", 0444, rootdir, NULL,
&dmaengine_summary_fops);
}
#else
static inline void dmaengine_debugfs_init(void) { }
static inline int dmaengine_debug_register(struct dma_device *dma_dev)
{
return 0;
}
static inline void dmaengine_debug_unregister(struct dma_device *dma_dev) { }
#endif /* DEBUG_FS */
/* --- sysfs implementation --- */
#define DMA_SLAVE_NAME "slave"
/**
* dev_to_dma_chan - convert a device pointer to its sysfs container object
* @dev: device node
*
* Must be called under dma_list_mutex.
*/
static struct dma_chan *dev_to_dma_chan(struct device *dev)
{
struct dma_chan_dev *chan_dev;
chan_dev = container_of(dev, typeof(*chan_dev), device);
return chan_dev->chan;
}
static ssize_t memcpy_count_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dma_chan *chan;
unsigned long count = 0;
int i;
int err;
mutex_lock(&dma_list_mutex);
chan = dev_to_dma_chan(dev);
if (chan) {
for_each_possible_cpu(i)
count += per_cpu_ptr(chan->local, i)->memcpy_count;
err = sysfs_emit(buf, "%lu\n", count);
} else
err = -ENODEV;
mutex_unlock(&dma_list_mutex);
return err;
}
static DEVICE_ATTR_RO(memcpy_count);
static ssize_t bytes_transferred_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dma_chan *chan;
unsigned long count = 0;
int i;
int err;
mutex_lock(&dma_list_mutex);
chan = dev_to_dma_chan(dev);
if (chan) {
for_each_possible_cpu(i)
count += per_cpu_ptr(chan->local, i)->bytes_transferred;
err = sysfs_emit(buf, "%lu\n", count);
} else
err = -ENODEV;
mutex_unlock(&dma_list_mutex);
return err;
}
static DEVICE_ATTR_RO(bytes_transferred);
static ssize_t in_use_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct dma_chan *chan;
int err;
mutex_lock(&dma_list_mutex);
chan = dev_to_dma_chan(dev);
if (chan)
err = sysfs_emit(buf, "%d\n", chan->client_count);
else
err = -ENODEV;
mutex_unlock(&dma_list_mutex);
return err;
}
static DEVICE_ATTR_RO(in_use);
static struct attribute *dma_dev_attrs[] = {
&dev_attr_memcpy_count.attr,
&dev_attr_bytes_transferred.attr,
&dev_attr_in_use.attr,
NULL,
};
ATTRIBUTE_GROUPS(dma_dev);
static void chan_dev_release(struct device *dev)
{
struct dma_chan_dev *chan_dev;
chan_dev = container_of(dev, typeof(*chan_dev), device);
kfree(chan_dev);
}
static struct class dma_devclass = {
.name = "dma",
.dev_groups = dma_dev_groups,
.dev_release = chan_dev_release,
};
/* --- client and device registration --- */
/* enable iteration over all operation types */
static dma_cap_mask_t dma_cap_mask_all;
/**
* struct dma_chan_tbl_ent - tracks channel allocations per core/operation
* @chan: associated channel for this entry
*/
struct dma_chan_tbl_ent {
struct dma_chan *chan;
};
/* percpu lookup table for memory-to-memory offload providers */
static struct dma_chan_tbl_ent __percpu *channel_table[DMA_TX_TYPE_END];
static int __init dma_channel_table_init(void)
{
enum dma_transaction_type cap;
int err = 0;
bitmap_fill(dma_cap_mask_all.bits, DMA_TX_TYPE_END);
/* 'interrupt', 'private', and 'slave' are channel capabilities,
* but are not associated with an operation so they do not need
* an entry in the channel_table
*/
clear_bit(DMA_INTERRUPT, dma_cap_mask_all.bits);
clear_bit(DMA_PRIVATE, dma_cap_mask_all.bits);
clear_bit(DMA_SLAVE, dma_cap_mask_all.bits);
for_each_dma_cap_mask(cap, dma_cap_mask_all) {
channel_table[cap] = alloc_percpu(struct dma_chan_tbl_ent);
if (!channel_table[cap]) {
err = -ENOMEM;
break;
}
}
if (err) {
pr_err("dmaengine dma_channel_table_init failure: %d\n", err);
for_each_dma_cap_mask(cap, dma_cap_mask_all)
free_percpu(channel_table[cap]);
}
return err;
}
arch_initcall(dma_channel_table_init);
/**
* dma_chan_is_local - checks if the channel is in the same NUMA-node as the CPU
* @chan: DMA channel to test
* @cpu: CPU index which the channel should be close to
*
* Returns true if the channel is in the same NUMA-node as the CPU.
*/
static bool dma_chan_is_local(struct dma_chan *chan, int cpu)
{
int node = dev_to_node(chan->device->dev);
return node == NUMA_NO_NODE ||
cpumask_test_cpu(cpu, cpumask_of_node(node));
}
/**
* min_chan - finds the channel with min count and in the same NUMA-node as the CPU
* @cap: capability to match
* @cpu: CPU index which the channel should be close to
*
* If some channels are close to the given CPU, the one with the lowest
* reference count is returned. Otherwise, CPU is ignored and only the
* reference count is taken into account.
*
* Must be called under dma_list_mutex.
*/
static struct dma_chan *min_chan(enum dma_transaction_type cap, int cpu)
{
struct dma_device *device;
struct dma_chan *chan;
struct dma_chan *min = NULL;
struct dma_chan *localmin = NULL;
list_for_each_entry(device, &dma_device_list, global_node) {
if (!dma_has_cap(cap, device->cap_mask) ||
dma_has_cap(DMA_PRIVATE, device->cap_mask))
continue;
list_for_each_entry(chan, &device->channels, device_node) {
if (!chan->client_count)
continue;
if (!min || chan->table_count < min->table_count)
min = chan;
if (dma_chan_is_local(chan, cpu))
if (!localmin ||
chan->table_count < localmin->table_count)
localmin = chan;
}
}
chan = localmin ? localmin : min;
if (chan)
chan->table_count++;
return chan;
}
/**
* dma_channel_rebalance - redistribute the available channels
*
* Optimize for CPU isolation (each CPU gets a dedicated channel for an
* operation type) in the SMP case, and operation isolation (avoid
* multi-tasking channels) in the non-SMP case.
*
* Must be called under dma_list_mutex.
*/
static void dma_channel_rebalance(void)
{
struct dma_chan *chan;
struct dma_device *device;
int cpu;
int cap;
/* undo the last distribution */
for_each_dma_cap_mask(cap, dma_cap_mask_all)
for_each_possible_cpu(cpu)
per_cpu_ptr(channel_table[cap], cpu)->chan = NULL;
list_for_each_entry(device, &dma_device_list, global_node) {
if (dma_has_cap(DMA_PRIVATE, device->cap_mask))
continue;
list_for_each_entry(chan, &device->channels, device_node)
chan->table_count = 0;
}
/* don't populate the channel_table if no clients are available */
if (!dmaengine_ref_count)
return;
/* redistribute available channels */
for_each_dma_cap_mask(cap, dma_cap_mask_all)
for_each_online_cpu(cpu) {
chan = min_chan(cap, cpu);
per_cpu_ptr(channel_table[cap], cpu)->chan = chan;
}
}
static int dma_device_satisfies_mask(struct dma_device *device,
const dma_cap_mask_t *want)
{
dma_cap_mask_t has;
bitmap_and(has.bits, want->bits, device->cap_mask.bits,
DMA_TX_TYPE_END);
return bitmap_equal(want->bits, has.bits, DMA_TX_TYPE_END);
}
static struct module *dma_chan_to_owner(struct dma_chan *chan)
{
return chan->device->owner;
}
/**
* balance_ref_count - catch up the channel reference count
* @chan: channel to balance ->client_count versus dmaengine_ref_count
*
* Must be called under dma_list_mutex.
*/
static void balance_ref_count(struct dma_chan *chan)
{
struct module *owner = dma_chan_to_owner(chan);
while (chan->client_count < dmaengine_ref_count) {
__module_get(owner);
chan->client_count++;
}
}
static void dma_device_release(struct kref *ref)
{
struct dma_device *device = container_of(ref, struct dma_device, ref);
list_del_rcu(&device->global_node);
dma_channel_rebalance();
if (device->device_release)
device->device_release(device);
}
static void dma_device_put(struct dma_device *device)
{
lockdep_assert_held(&dma_list_mutex);
kref_put(&device->ref, dma_device_release);
}
/**
* dma_chan_get - try to grab a DMA channel's parent driver module
* @chan: channel to grab
*
* Must be called under dma_list_mutex.
*/
static int dma_chan_get(struct dma_chan *chan)
{
struct module *owner = dma_chan_to_owner(chan);
int ret;
/* The channel is already in use, update client count */
if (chan->client_count) {
__module_get(owner);
chan->client_count++;
return 0;
}
if (!try_module_get(owner))
return -ENODEV;
ret = kref_get_unless_zero(&chan->device->ref);
if (!ret) {
ret = -ENODEV;
goto module_put_out;
}
/* allocate upon first client reference */
if (chan->device->device_alloc_chan_resources) {
ret = chan->device->device_alloc_chan_resources(chan);
if (ret < 0)
goto err_out;
}
chan->client_count++;
if (!dma_has_cap(DMA_PRIVATE, chan->device->cap_mask))
balance_ref_count(chan);
return 0;
err_out:
dma_device_put(chan->device);
module_put_out:
module_put(owner);
return ret;
}
/**
* dma_chan_put - drop a reference to a DMA channel's parent driver module
* @chan: channel to release
*
* Must be called under dma_list_mutex.
*/
static void dma_chan_put(struct dma_chan *chan)
{
/* This channel is not in use, bail out */
if (!chan->client_count)
return;
chan->client_count--;
/* This channel is not in use anymore, free it */
if (!chan->client_count && chan->device->device_free_chan_resources) {
/* Make sure all operations have completed */
dmaengine_synchronize(chan);
chan->device->device_free_chan_resources(chan);
}
/* If the channel is used via a DMA request router, free the mapping */
if (chan->router && chan->router->route_free) {
chan->router->route_free(chan->router->dev, chan->route_data);
chan->router = NULL;
chan->route_data = NULL;
}
dma_device_put(chan->device);
module_put(dma_chan_to_owner(chan));
}
enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
{
enum dma_status status;
unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000);
dma_async_issue_pending(chan);
do {
status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
dev_err(chan->device->dev, "%s: timeout!\n", __func__);
return DMA_ERROR;
}
if (status != DMA_IN_PROGRESS)
break;
cpu_relax();
} while (1);
return status;
}
EXPORT_SYMBOL(dma_sync_wait);
/**
* dma_find_channel - find a channel to carry out the operation
* @tx_type: transaction type
*/
struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type)
{
return this_cpu_read(channel_table[tx_type]->chan);
}
EXPORT_SYMBOL(dma_find_channel);
/**
* dma_issue_pending_all - flush all pending operations across all channels
*/
void dma_issue_pending_all(void)
{
struct dma_device *device;
struct dma_chan *chan;
rcu_read_lock();
list_for_each_entry_rcu(device, &dma_device_list, global_node) {
if (dma_has_cap(DMA_PRIVATE, device->cap_mask))
continue;
list_for_each_entry(chan, &device->channels, device_node)
if (chan->client_count)
device->device_issue_pending(chan);
}
rcu_read_unlock();
}
EXPORT_SYMBOL(dma_issue_pending_all);
int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps)
{
struct dma_device *device;
if (!chan || !caps)
return -EINVAL;
device = chan->device;
/* check if the channel supports slave transactions */
if (!(test_bit(DMA_SLAVE, device->cap_mask.bits) ||
test_bit(DMA_CYCLIC, device->cap_mask.bits)))
return -ENXIO;
/*
* Check whether it reports it uses the generic slave
* capabilities, if not, that means it doesn't support any
* kind of slave capabilities reporting.
*/
if (!device->directions)
return -ENXIO;
caps->src_addr_widths = device->src_addr_widths;
caps->dst_addr_widths = device->dst_addr_widths;
caps->directions = device->directions;
caps->min_burst = device->min_burst;
caps->max_burst = device->max_burst;
caps->max_sg_burst = device->max_sg_burst;
caps->residue_granularity = device->residue_granularity;
caps->descriptor_reuse = device->descriptor_reuse;
caps->cmd_pause = !!device->device_pause;
caps->cmd_resume = !!device->device_resume;
caps->cmd_terminate = !!device->device_terminate_all;
/*
* DMA engine device might be configured with non-uniformly
* distributed slave capabilities per device channels. In this
* case the corresponding driver may provide the device_caps
* callback to override the generic capabilities with
* channel-specific ones.
*/
if (device->device_caps)
device->device_caps(chan, caps);
return 0;
}
EXPORT_SYMBOL_GPL(dma_get_slave_caps);
static struct dma_chan *private_candidate(const dma_cap_mask_t *mask,
struct dma_device *dev,
dma_filter_fn fn, void *fn_param)
{
struct dma_chan *chan;
if (mask && !dma_device_satisfies_mask(dev, mask)) {
dev_dbg(dev->dev, "%s: wrong capabilities\n", __func__);
return NULL;
}
/* devices with multiple channels need special handling as we need to
* ensure that all channels are either private or public.
*/
if (dev->chancnt > 1 && !dma_has_cap(DMA_PRIVATE, dev->cap_mask))
list_for_each_entry(chan, &dev->channels, device_node) {
/* some channels are already publicly allocated */
if (chan->client_count)
return NULL;
}
list_for_each_entry(chan, &dev->channels, device_node) {
if (chan->client_count) {
dev_dbg(dev->dev, "%s: %s busy\n",
__func__, dma_chan_name(chan));
continue;
}
if (fn && !fn(chan, fn_param)) {
dev_dbg(dev->dev, "%s: %s filter said false\n",
__func__, dma_chan_name(chan));
continue;
}
return chan;
}
return NULL;
}
static struct dma_chan *find_candidate(struct dma_device *device,
const dma_cap_mask_t *mask,
dma_filter_fn fn, void *fn_param)
{
struct dma_chan *chan = private_candidate(mask, device, fn, fn_param);
int err;
if (chan) {
/* Found a suitable channel, try to grab, prep, and return it.
* We first set DMA_PRIVATE to disable balance_ref_count as this
* channel will not be published in the general-purpose
* allocator
*/
dma_cap_set(DMA_PRIVATE, device->cap_mask);
device->privatecnt++;
err = dma_chan_get(chan);
if (err) {
if (err == -ENODEV) {
dev_dbg(device->dev, "%s: %s module removed\n",
__func__, dma_chan_name(chan));
list_del_rcu(&device->global_node);
} else
dev_dbg(device->dev,
"%s: failed to get %s: (%d)\n",
__func__, dma_chan_name(chan), err);
if (--device->privatecnt == 0)
dma_cap_clear(DMA_PRIVATE, device->cap_mask);
chan = ERR_PTR(err);
}
}
return chan ? chan : ERR_PTR(-EPROBE_DEFER);
}
/**
* dma_get_slave_channel - try to get specific channel exclusively
* @chan: target channel
*/
struct dma_chan *dma_get_slave_channel(struct dma_chan *chan)
{
/* lock against __dma_request_channel */
mutex_lock(&dma_list_mutex);
if (chan->client_count == 0) {
struct dma_device *device = chan->device;
int err;
dma_cap_set(DMA_PRIVATE, device->cap_mask);
device->privatecnt++;
err = dma_chan_get(chan);
if (err) {
dev_dbg(chan->device->dev,
"%s: failed to get %s: (%d)\n",
__func__, dma_chan_name(chan), err);
chan = NULL;
if (--device->privatecnt == 0)
dma_cap_clear(DMA_PRIVATE, device->cap_mask);
}
} else
chan = NULL;
mutex_unlock(&dma_list_mutex);
return chan;
}
EXPORT_SYMBOL_GPL(dma_get_slave_channel);
struct dma_chan *dma_get_any_slave_channel(struct dma_device *device)
{
dma_cap_mask_t mask;
struct dma_chan *chan;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
/* lock against __dma_request_channel */
mutex_lock(&dma_list_mutex);
chan = find_candidate(device, &mask, NULL, NULL);
mutex_unlock(&dma_list_mutex);
return IS_ERR(chan) ? NULL : chan;
}
EXPORT_SYMBOL_GPL(dma_get_any_slave_channel);
/**
* __dma_request_channel - try to allocate an exclusive channel
* @mask: capabilities that the channel must satisfy
* @fn: optional callback to disposition available channels
* @fn_param: opaque parameter to pass to dma_filter_fn()
* @np: device node to look for DMA channels
*
* Returns pointer to appropriate DMA channel on success or NULL.
*/
struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
dma_filter_fn fn, void *fn_param,
struct device_node *np)
{
struct dma_device *device, *_d;
struct dma_chan *chan = NULL;
/* Find a channel */
mutex_lock(&dma_list_mutex);
list_for_each_entry_safe(device, _d, &dma_device_list, global_node) {
/* Finds a DMA controller with matching device node */
if (np && device->dev->of_node && np != device->dev->of_node)
continue;
chan = find_candidate(device, mask, fn, fn_param);
if (!IS_ERR(chan))
break;
chan = NULL;
}
mutex_unlock(&dma_list_mutex);
pr_debug("%s: %s (%s)\n",
__func__,
chan ? "success" : "fail",
chan ? dma_chan_name(chan) : NULL);
return chan;
}
EXPORT_SYMBOL_GPL(__dma_request_channel);
static const struct dma_slave_map *dma_filter_match(struct dma_device *device,
const char *name,
struct device *dev)
{
int i;
if (!device->filter.mapcnt)
return NULL;
for (i = 0; i < device->filter.mapcnt; i++) {
const struct dma_slave_map *map = &device->filter.map[i];
if (!strcmp(map->devname, dev_name(dev)) &&
!strcmp(map->slave, name))
return map;
}
return NULL;
}
/**
* dma_request_chan - try to allocate an exclusive slave channel
* @dev: pointer to client device structure
* @name: slave channel name
*
* Returns pointer to appropriate DMA channel on success or an error pointer.
*/
struct dma_chan *dma_request_chan(struct device *dev, const char *name)
{
struct dma_device *d, *_d;
struct dma_chan *chan = NULL;
/* If device-tree is present get slave info from here */
if (dev->of_node)
chan = of_dma_request_slave_channel(dev->of_node, name);
/* If device was enumerated by ACPI get slave info from here */
if (has_acpi_companion(dev) && !chan)
chan = acpi_dma_request_slave_chan_by_name(dev, name);
if (PTR_ERR(chan) == -EPROBE_DEFER)
return chan;
if (!IS_ERR_OR_NULL(chan))
goto found;
/* Try to find the channel via the DMA filter map(s) */
mutex_lock(&dma_list_mutex);
list_for_each_entry_safe(d, _d, &dma_device_list, global_node) {
dma_cap_mask_t mask;
const struct dma_slave_map *map = dma_filter_match(d, name, dev);
if (!map)
continue;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
chan = find_candidate(d, &mask, d->filter.fn, map->param);
if (!IS_ERR(chan))
break;
}
mutex_unlock(&dma_list_mutex);
if (IS_ERR(chan))
return chan;
if (!chan)
return ERR_PTR(-EPROBE_DEFER);
found:
#ifdef CONFIG_DEBUG_FS
chan->dbg_client_name = kasprintf(GFP_KERNEL, "%s:%s", dev_name(dev),
name);
#endif
chan->name = kasprintf(GFP_KERNEL, "dma:%s", name);
if (!chan->name)
return chan;
chan->slave = dev;
if (sysfs_create_link(&chan->dev->device.kobj, &dev->kobj,
DMA_SLAVE_NAME))
dev_warn(dev, "Cannot create DMA %s symlink\n", DMA_SLAVE_NAME);
if (sysfs_create_link(&dev->kobj, &chan->dev->device.kobj, chan->name))
dev_warn(dev, "Cannot create DMA %s symlink\n", chan->name);
return chan;
}
EXPORT_SYMBOL_GPL(dma_request_chan);
/**
* dma_request_chan_by_mask - allocate a channel satisfying certain capabilities
* @mask: capabilities that the channel must satisfy
*
* Returns pointer to appropriate DMA channel on success or an error pointer.
*/
struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask)
{
struct dma_chan *chan;
if (!mask)
return ERR_PTR(-ENODEV);
chan = __dma_request_channel(mask, NULL, NULL, NULL);
if (!chan) {
mutex_lock(&dma_list_mutex);
if (list_empty(&dma_device_list))
chan = ERR_PTR(-EPROBE_DEFER);
else
chan = ERR_PTR(-ENODEV);
mutex_unlock(&dma_list_mutex);
}
return chan;
}
EXPORT_SYMBOL_GPL(dma_request_chan_by_mask);
void dma_release_channel(struct dma_chan *chan)
{
mutex_lock(&dma_list_mutex);
WARN_ONCE(chan->client_count != 1,
"chan reference count %d != 1\n", chan->client_count);
dma_chan_put(chan);
/* drop PRIVATE cap enabled by __dma_request_channel() */
if (--chan->device->privatecnt == 0)
dma_cap_clear(DMA_PRIVATE, chan->device->cap_mask);
if (chan->slave) {
sysfs_remove_link(&chan->dev->device.kobj, DMA_SLAVE_NAME);
sysfs_remove_link(&chan->slave->kobj, chan->name);
kfree(chan->name);
chan->name = NULL;
chan->slave = NULL;
}
#ifdef CONFIG_DEBUG_FS
kfree(chan->dbg_client_name);
chan->dbg_client_name = NULL;
#endif
mutex_unlock(&dma_list_mutex);
}
EXPORT_SYMBOL_GPL(dma_release_channel);
/**
* dmaengine_get - register interest in dma_channels
*/
void dmaengine_get(void)
{
struct dma_device *device, *_d;
struct dma_chan *chan;
int err;
mutex_lock(&dma_list_mutex);
dmaengine_ref_count++;
/* try to grab channels */
list_for_each_entry_safe(device, _d, &dma_device_list, global_node) {
if (dma_has_cap(DMA_PRIVATE, device->cap_mask))
continue;
list_for_each_entry(chan, &device->channels, device_node) {
err = dma_chan_get(chan);
if (err == -ENODEV) {
/* module removed before we could use it */
list_del_rcu(&device->global_node);
break;
} else if (err)
dev_dbg(chan->device->dev,
"%s: failed to get %s: (%d)\n",
__func__, dma_chan_name(chan), err);
}
}
/* if this is the first reference and there were channels
* waiting we need to rebalance to get those channels
* incorporated into the channel table
*/
if (dmaengine_ref_count == 1)
dma_channel_rebalance();
mutex_unlock(&dma_list_mutex);
}
EXPORT_SYMBOL(dmaengine_get);
/**
* dmaengine_put - let DMA drivers be removed when ref_count == 0
*/
void dmaengine_put(void)
{
struct dma_device *device, *_d;
struct dma_chan *chan;
mutex_lock(&dma_list_mutex);
dmaengine_ref_count--;
BUG_ON(dmaengine_ref_count < 0);
/* drop channel references */
list_for_each_entry_safe(device, _d, &dma_device_list, global_node) {
if (dma_has_cap(DMA_PRIVATE, device->cap_mask))
continue;
list_for_each_entry(chan, &device->channels, device_node)
dma_chan_put(chan);
}
mutex_unlock(&dma_list_mutex);
}
EXPORT_SYMBOL(dmaengine_put);
static bool device_has_all_tx_types(struct dma_device *device)
{
/* A device that satisfies this test has channels that will never cause
* an async_tx channel switch event as all possible operation types can
* be handled.
*/
#ifdef CONFIG_ASYNC_TX_DMA
if (!dma_has_cap(DMA_INTERRUPT, device->cap_mask))
return false;
#endif
#if IS_ENABLED(CONFIG_ASYNC_MEMCPY)
if (!dma_has_cap(DMA_MEMCPY, device->cap_mask))
return false;
#endif
#if IS_ENABLED(CONFIG_ASYNC_XOR)
if (!dma_has_cap(DMA_XOR, device->cap_mask))
return false;
#ifndef CONFIG_ASYNC_TX_DISABLE_XOR_VAL_DMA
if (!dma_has_cap(DMA_XOR_VAL, device->cap_mask))
return false;
#endif
#endif
#if IS_ENABLED(CONFIG_ASYNC_PQ)
if (!dma_has_cap(DMA_PQ, device->cap_mask))
return false;
#ifndef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA
if (!dma_has_cap(DMA_PQ_VAL, device->cap_mask))
return false;
#endif
#endif
return true;
}
static int get_dma_id(struct dma_device *device)
{
int rc = ida_alloc(&dma_ida, GFP_KERNEL);
if (rc < 0)
return rc;
device->dev_id = rc;
return 0;
}
static int __dma_async_device_channel_register(struct dma_device *device,
struct dma_chan *chan)
{
int rc;
chan->local = alloc_percpu(typeof(*chan->local));
if (!chan->local)
return -ENOMEM;
chan->dev = kzalloc(sizeof(*chan->dev), GFP_KERNEL);
if (!chan->dev) {
rc = -ENOMEM;
goto err_free_local;
}
/*
* When the chan_id is a negative value, we are dynamically adding
* the channel. Otherwise we are static enumerating.
*/
chan->chan_id = ida_alloc(&device->chan_ida, GFP_KERNEL);
if (chan->chan_id < 0) {
pr_err("%s: unable to alloc ida for chan: %d\n",
__func__, chan->chan_id);
rc = chan->chan_id;
goto err_free_dev;
}
chan->dev->device.class = &dma_devclass;
chan->dev->device.parent = device->dev;
chan->dev->chan = chan;
chan->dev->dev_id = device->dev_id;
dev_set_name(&chan->dev->device, "dma%dchan%d",
device->dev_id, chan->chan_id);
rc = device_register(&chan->dev->device);
if (rc)
goto err_out_ida;
chan->client_count = 0;
device->chancnt++;
return 0;
err_out_ida:
ida_free(&device->chan_ida, chan->chan_id);
err_free_dev:
kfree(chan->dev);
err_free_local:
free_percpu(chan->local);
chan->local = NULL;
return rc;
}
int dma_async_device_channel_register(struct dma_device *device,
struct dma_chan *chan)
{
int rc;
rc = __dma_async_device_channel_register(device, chan);
if (rc < 0)
return rc;
dma_channel_rebalance();
return 0;
}
EXPORT_SYMBOL_GPL(dma_async_device_channel_register);
static void __dma_async_device_channel_unregister(struct dma_device *device,
struct dma_chan *chan)
{
WARN_ONCE(!device->device_release && chan->client_count,
"%s called while %d clients hold a reference\n",
__func__, chan->client_count);
mutex_lock(&dma_list_mutex);
device->chancnt--;
chan->dev->chan = NULL;
mutex_unlock(&dma_list_mutex);
ida_free(&device->chan_ida, chan->chan_id);
device_unregister(&chan->dev->device);
free_percpu(chan->local);
}
void dma_async_device_channel_unregister(struct dma_device *device,
struct dma_chan *chan)
{
__dma_async_device_channel_unregister(device, chan);
dma_channel_rebalance();
}
EXPORT_SYMBOL_GPL(dma_async_device_channel_unregister);
/**
* dma_async_device_register - registers DMA devices found
* @device: pointer to &struct dma_device
*
* After calling this routine the structure should not be freed except in the
* device_release() callback which will be called after
* dma_async_device_unregister() is called and no further references are taken.
*/
int dma_async_device_register(struct dma_device *device)
{
int rc;
struct dma_chan* chan;
if (!device)
return -ENODEV;
/* validate device routines */
if (!device->dev) {
pr_err("DMAdevice must have dev\n");
return -EIO;
}
device->owner = device->dev->driver->owner;
#define CHECK_CAP(_name, _type) \
{ \
if (dma_has_cap(_type, device->cap_mask) && !device->device_prep_##_name) { \
dev_err(device->dev, \
"Device claims capability %s, but op is not defined\n", \
__stringify(_type)); \
return -EIO; \
} \
}
CHECK_CAP(dma_memcpy, DMA_MEMCPY);
CHECK_CAP(dma_xor, DMA_XOR);
CHECK_CAP(dma_xor_val, DMA_XOR_VAL);
CHECK_CAP(dma_pq, DMA_PQ);
CHECK_CAP(dma_pq_val, DMA_PQ_VAL);
CHECK_CAP(dma_memset, DMA_MEMSET);
CHECK_CAP(dma_interrupt, DMA_INTERRUPT);
CHECK_CAP(dma_cyclic, DMA_CYCLIC);
CHECK_CAP(interleaved_dma, DMA_INTERLEAVE);
#undef CHECK_CAP
if (!device->device_tx_status) {
dev_err(device->dev, "Device tx_status is not defined\n");
return -EIO;
}
if (!device->device_issue_pending) {
dev_err(device->dev, "Device issue_pending is not defined\n");
return -EIO;
}
if (!device->device_release)
dev_dbg(device->dev,
"WARN: Device release is not defined so it is not safe to unbind this driver while in use\n");
kref_init(&device->ref);
/* note: this only matters in the
* CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH=n case
*/
if (device_has_all_tx_types(device))
dma_cap_set(DMA_ASYNC_TX, device->cap_mask);
rc = get_dma_id(device);
if (rc != 0)
return rc;
ida_init(&device->chan_ida);
/* represent channels in sysfs. Probably want devs too */
list_for_each_entry(chan, &device->channels, device_node) {
rc = __dma_async_device_channel_register(device, chan);
if (rc < 0)
goto err_out;
}
mutex_lock(&dma_list_mutex);
/* take references on public channels */
if (dmaengine_ref_count && !dma_has_cap(DMA_PRIVATE, device->cap_mask))
list_for_each_entry(chan, &device->channels, device_node) {
/* if clients are already waiting for channels we need
* to take references on their behalf
*/
if (dma_chan_get(chan) == -ENODEV) {
/* note we can only get here for the first
* channel as the remaining channels are
* guaranteed to get a reference
*/
rc = -ENODEV;
mutex_unlock(&dma_list_mutex);
goto err_out;
}
}
list_add_tail_rcu(&device->global_node, &dma_device_list);
if (dma_has_cap(DMA_PRIVATE, device->cap_mask))
device->privatecnt++; /* Always private */
dma_channel_rebalance();
mutex_unlock(&dma_list_mutex);
dmaengine_debug_register(device);
return 0;
err_out:
/* if we never registered a channel just release the idr */
if (!device->chancnt) {
ida_free(&dma_ida, device->dev_id);
return rc;
}
list_for_each_entry(chan, &device->channels, device_node) {
if (chan->local == NULL)
continue;
mutex_lock(&dma_list_mutex);
chan->dev->chan = NULL;
mutex_unlock(&dma_list_mutex);
device_unregister(&chan->dev->device);
free_percpu(chan->local);
}
return rc;
}
EXPORT_SYMBOL(dma_async_device_register);
/**
* dma_async_device_unregister - unregister a DMA device
* @device: pointer to &struct dma_device
*
* This routine is called by dma driver exit routines, dmaengine holds module
* references to prevent it being called while channels are in use.
*/
void dma_async_device_unregister(struct dma_device *device)
{
struct dma_chan *chan, *n;
dmaengine_debug_unregister(device);
list_for_each_entry_safe(chan, n, &device->channels, device_node)
__dma_async_device_channel_unregister(device, chan);
mutex_lock(&dma_list_mutex);
/*
* setting DMA_PRIVATE ensures the device being torn down will not
* be used in the channel_table
*/
dma_cap_set(DMA_PRIVATE, device->cap_mask);
dma_channel_rebalance();
ida_free(&dma_ida, device->dev_id);
dma_device_put(device);
mutex_unlock(&dma_list_mutex);
}
EXPORT_SYMBOL(dma_async_device_unregister);
static void dmaenginem_async_device_unregister(void *device)
{
dma_async_device_unregister(device);
}
/**
* dmaenginem_async_device_register - registers DMA devices found
* @device: pointer to &struct dma_device
*
* The operation is managed and will be undone on driver detach.
*/
int dmaenginem_async_device_register(struct dma_device *device)
{
int ret;
ret = dma_async_device_register(device);
if (ret)
return ret;
return devm_add_action_or_reset(device->dev, dmaenginem_async_device_unregister, device);
}
EXPORT_SYMBOL(dmaenginem_async_device_register);
struct dmaengine_unmap_pool {
struct kmem_cache *cache;
const char *name;
mempool_t *pool;
size_t size;
};
#define __UNMAP_POOL(x) { .size = x, .name = "dmaengine-unmap-" __stringify(x) }
static struct dmaengine_unmap_pool unmap_pool[] = {
__UNMAP_POOL(2),
#if IS_ENABLED(CONFIG_DMA_ENGINE_RAID)
__UNMAP_POOL(16),
__UNMAP_POOL(128),
__UNMAP_POOL(256),
#endif
};
static struct dmaengine_unmap_pool *__get_unmap_pool(int nr)
{
int order = get_count_order(nr);
switch (order) {
case 0 ... 1:
return &unmap_pool[0];
#if IS_ENABLED(CONFIG_DMA_ENGINE_RAID)
case 2 ... 4:
return &unmap_pool[1];
case 5 ... 7:
return &unmap_pool[2];
case 8:
return &unmap_pool[3];
#endif
default:
BUG();
return NULL;
}
}
static void dmaengine_unmap(struct kref *kref)
{
struct dmaengine_unmap_data *unmap = container_of(kref, typeof(*unmap), kref);
struct device *dev = unmap->dev;
int cnt, i;
cnt = unmap->to_cnt;
for (i = 0; i < cnt; i++)
dma_unmap_page(dev, unmap->addr[i], unmap->len,
DMA_TO_DEVICE);
cnt += unmap->from_cnt;
for (; i < cnt; i++)
dma_unmap_page(dev, unmap->addr[i], unmap->len,
DMA_FROM_DEVICE);
cnt += unmap->bidi_cnt;
for (; i < cnt; i++) {
if (unmap->addr[i] == 0)
continue;
dma_unmap_page(dev, unmap->addr[i], unmap->len,
DMA_BIDIRECTIONAL);
}
cnt = unmap->map_cnt;
mempool_free(unmap, __get_unmap_pool(cnt)->pool);
}
void dmaengine_unmap_put(struct dmaengine_unmap_data *unmap)
{
if (unmap)
kref_put(&unmap->kref, dmaengine_unmap);
}
EXPORT_SYMBOL_GPL(dmaengine_unmap_put);
static void dmaengine_destroy_unmap_pool(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(unmap_pool); i++) {
struct dmaengine_unmap_pool *p = &unmap_pool[i];
mempool_destroy(p->pool);
p->pool = NULL;
kmem_cache_destroy(p->cache);
p->cache = NULL;
}
}
static int __init dmaengine_init_unmap_pool(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(unmap_pool); i++) {
struct dmaengine_unmap_pool *p = &unmap_pool[i];
size_t size;
size = sizeof(struct dmaengine_unmap_data) +
sizeof(dma_addr_t) * p->size;
p->cache = kmem_cache_create(p->name, size, 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!p->cache)
break;
p->pool = mempool_create_slab_pool(1, p->cache);
if (!p->pool)
break;
}
if (i == ARRAY_SIZE(unmap_pool))
return 0;
dmaengine_destroy_unmap_pool();
return -ENOMEM;
}
struct dmaengine_unmap_data *
dmaengine_get_unmap_data(struct device *dev, int nr, gfp_t flags)
{
struct dmaengine_unmap_data *unmap;
unmap = mempool_alloc(__get_unmap_pool(nr)->pool, flags);
if (!unmap)
return NULL;
memset(unmap, 0, sizeof(*unmap));
kref_init(&unmap->kref);
unmap->dev = dev;
unmap->map_cnt = nr;
return unmap;
}
EXPORT_SYMBOL(dmaengine_get_unmap_data);
void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
struct dma_chan *chan)
{
tx->chan = chan;
#ifdef CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH
spin_lock_init(&tx->lock);
#endif
}
EXPORT_SYMBOL(dma_async_tx_descriptor_init);
static inline int desc_check_and_set_metadata_mode(
struct dma_async_tx_descriptor *desc, enum dma_desc_metadata_mode mode)
{
/* Make sure that the metadata mode is not mixed */
if (!desc->desc_metadata_mode) {
if (dmaengine_is_metadata_mode_supported(desc->chan, mode))
desc->desc_metadata_mode = mode;
else
return -ENOTSUPP;
} else if (desc->desc_metadata_mode != mode) {
return -EINVAL;
}
return 0;
}
int dmaengine_desc_attach_metadata(struct dma_async_tx_descriptor *desc,
void *data, size_t len)
{
int ret;
if (!desc)
return -EINVAL;
ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_CLIENT);
if (ret)
return ret;
if (!desc->metadata_ops || !desc->metadata_ops->attach)
return -ENOTSUPP;
return desc->metadata_ops->attach(desc, data, len);
}
EXPORT_SYMBOL_GPL(dmaengine_desc_attach_metadata);
void *dmaengine_desc_get_metadata_ptr(struct dma_async_tx_descriptor *desc,
size_t *payload_len, size_t *max_len)
{
int ret;
if (!desc)
return ERR_PTR(-EINVAL);
ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_ENGINE);
if (ret)
return ERR_PTR(ret);
if (!desc->metadata_ops || !desc->metadata_ops->get_ptr)
return ERR_PTR(-ENOTSUPP);
return desc->metadata_ops->get_ptr(desc, payload_len, max_len);
}
EXPORT_SYMBOL_GPL(dmaengine_desc_get_metadata_ptr);
int dmaengine_desc_set_metadata_len(struct dma_async_tx_descriptor *desc,
size_t payload_len)
{
int ret;
if (!desc)
return -EINVAL;
ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_ENGINE);
if (ret)
return ret;
if (!desc->metadata_ops || !desc->metadata_ops->set_len)
return -ENOTSUPP;
return desc->metadata_ops->set_len(desc, payload_len);
}
EXPORT_SYMBOL_GPL(dmaengine_desc_set_metadata_len);
/**
* dma_wait_for_async_tx - spin wait for a transaction to complete
* @tx: in-flight transaction to wait on
*/
enum dma_status
dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
{
unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000);
if (!tx)
return DMA_COMPLETE;
while (tx->cookie == -EBUSY) {
if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
dev_err(tx->chan->device->dev,
"%s timeout waiting for descriptor submission\n",
__func__);
return DMA_ERROR;
}
cpu_relax();
}
return dma_sync_wait(tx->chan, tx->cookie);
}
EXPORT_SYMBOL_GPL(dma_wait_for_async_tx);
/**
* dma_run_dependencies - process dependent operations on the target channel
* @tx: transaction with dependencies
*
* Helper routine for DMA drivers to process (start) dependent operations
* on their target channel.
*/
void dma_run_dependencies(struct dma_async_tx_descriptor *tx)
{
struct dma_async_tx_descriptor *dep = txd_next(tx);
struct dma_async_tx_descriptor *dep_next;
struct dma_chan *chan;
if (!dep)
return;
/* we'll submit tx->next now, so clear the link */
txd_clear_next(tx);
chan = dep->chan;
/* keep submitting up until a channel switch is detected
* in that case we will be called again as a result of
* processing the interrupt from async_tx_channel_switch
*/
for (; dep; dep = dep_next) {
txd_lock(dep);
txd_clear_parent(dep);
dep_next = txd_next(dep);
if (dep_next && dep_next->chan == chan)
txd_clear_next(dep); /* ->next will be submitted */
else
dep_next = NULL; /* submit current dep and terminate */
txd_unlock(dep);
dep->tx_submit(dep);
}
chan->device->device_issue_pending(chan);
}
EXPORT_SYMBOL_GPL(dma_run_dependencies);
static int __init dma_bus_init(void)
{
int err = dmaengine_init_unmap_pool();
if (err)
return err;
err = class_register(&dma_devclass);
if (!err)
dmaengine_debugfs_init();
return err;
}
arch_initcall(dma_bus_init);
| linux-master | drivers/dma/dmaengine.c |
/*
* Copyright (C) 2017 Spreadtrum Communications Inc.
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/dma/sprd-dma.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "virt-dma.h"
#define SPRD_DMA_CHN_REG_OFFSET 0x1000
#define SPRD_DMA_CHN_REG_LENGTH 0x40
#define SPRD_DMA_MEMCPY_MIN_SIZE 64
/* DMA global registers definition */
#define SPRD_DMA_GLB_PAUSE 0x0
#define SPRD_DMA_GLB_FRAG_WAIT 0x4
#define SPRD_DMA_GLB_REQ_PEND0_EN 0x8
#define SPRD_DMA_GLB_REQ_PEND1_EN 0xc
#define SPRD_DMA_GLB_INT_RAW_STS 0x10
#define SPRD_DMA_GLB_INT_MSK_STS 0x14
#define SPRD_DMA_GLB_REQ_STS 0x18
#define SPRD_DMA_GLB_CHN_EN_STS 0x1c
#define SPRD_DMA_GLB_DEBUG_STS 0x20
#define SPRD_DMA_GLB_ARB_SEL_STS 0x24
#define SPRD_DMA_GLB_2STAGE_GRP1 0x28
#define SPRD_DMA_GLB_2STAGE_GRP2 0x2c
#define SPRD_DMA_GLB_REQ_UID(uid) (0x4 * ((uid) - 1))
#define SPRD_DMA_GLB_REQ_UID_OFFSET 0x2000
/* DMA channel registers definition */
#define SPRD_DMA_CHN_PAUSE 0x0
#define SPRD_DMA_CHN_REQ 0x4
#define SPRD_DMA_CHN_CFG 0x8
#define SPRD_DMA_CHN_INTC 0xc
#define SPRD_DMA_CHN_SRC_ADDR 0x10
#define SPRD_DMA_CHN_DES_ADDR 0x14
#define SPRD_DMA_CHN_FRG_LEN 0x18
#define SPRD_DMA_CHN_BLK_LEN 0x1c
#define SPRD_DMA_CHN_TRSC_LEN 0x20
#define SPRD_DMA_CHN_TRSF_STEP 0x24
#define SPRD_DMA_CHN_WARP_PTR 0x28
#define SPRD_DMA_CHN_WARP_TO 0x2c
#define SPRD_DMA_CHN_LLIST_PTR 0x30
#define SPRD_DMA_CHN_FRAG_STEP 0x34
#define SPRD_DMA_CHN_SRC_BLK_STEP 0x38
#define SPRD_DMA_CHN_DES_BLK_STEP 0x3c
/* SPRD_DMA_GLB_2STAGE_GRP register definition */
#define SPRD_DMA_GLB_2STAGE_EN BIT(24)
#define SPRD_DMA_GLB_CHN_INT_MASK GENMASK(23, 20)
#define SPRD_DMA_GLB_DEST_INT BIT(22)
#define SPRD_DMA_GLB_SRC_INT BIT(20)
#define SPRD_DMA_GLB_LIST_DONE_TRG BIT(19)
#define SPRD_DMA_GLB_TRANS_DONE_TRG BIT(18)
#define SPRD_DMA_GLB_BLOCK_DONE_TRG BIT(17)
#define SPRD_DMA_GLB_FRAG_DONE_TRG BIT(16)
#define SPRD_DMA_GLB_TRG_OFFSET 16
#define SPRD_DMA_GLB_DEST_CHN_MASK GENMASK(13, 8)
#define SPRD_DMA_GLB_DEST_CHN_OFFSET 8
#define SPRD_DMA_GLB_SRC_CHN_MASK GENMASK(5, 0)
/* SPRD_DMA_CHN_INTC register definition */
#define SPRD_DMA_INT_MASK GENMASK(4, 0)
#define SPRD_DMA_INT_CLR_OFFSET 24
#define SPRD_DMA_FRAG_INT_EN BIT(0)
#define SPRD_DMA_BLK_INT_EN BIT(1)
#define SPRD_DMA_TRANS_INT_EN BIT(2)
#define SPRD_DMA_LIST_INT_EN BIT(3)
#define SPRD_DMA_CFG_ERR_INT_EN BIT(4)
/* SPRD_DMA_CHN_CFG register definition */
#define SPRD_DMA_CHN_EN BIT(0)
#define SPRD_DMA_LINKLIST_EN BIT(4)
#define SPRD_DMA_WAIT_BDONE_OFFSET 24
#define SPRD_DMA_DONOT_WAIT_BDONE 1
/* SPRD_DMA_CHN_REQ register definition */
#define SPRD_DMA_REQ_EN BIT(0)
/* SPRD_DMA_CHN_PAUSE register definition */
#define SPRD_DMA_PAUSE_EN BIT(0)
#define SPRD_DMA_PAUSE_STS BIT(2)
#define SPRD_DMA_PAUSE_CNT 0x2000
/* DMA_CHN_WARP_* register definition */
#define SPRD_DMA_HIGH_ADDR_MASK GENMASK(31, 28)
#define SPRD_DMA_LOW_ADDR_MASK GENMASK(31, 0)
#define SPRD_DMA_WRAP_ADDR_MASK GENMASK(27, 0)
#define SPRD_DMA_HIGH_ADDR_OFFSET 4
/* SPRD_DMA_CHN_INTC register definition */
#define SPRD_DMA_FRAG_INT_STS BIT(16)
#define SPRD_DMA_BLK_INT_STS BIT(17)
#define SPRD_DMA_TRSC_INT_STS BIT(18)
#define SPRD_DMA_LIST_INT_STS BIT(19)
#define SPRD_DMA_CFGERR_INT_STS BIT(20)
#define SPRD_DMA_CHN_INT_STS \
(SPRD_DMA_FRAG_INT_STS | SPRD_DMA_BLK_INT_STS | \
SPRD_DMA_TRSC_INT_STS | SPRD_DMA_LIST_INT_STS | \
SPRD_DMA_CFGERR_INT_STS)
/* SPRD_DMA_CHN_FRG_LEN register definition */
#define SPRD_DMA_SRC_DATAWIDTH_OFFSET 30
#define SPRD_DMA_DES_DATAWIDTH_OFFSET 28
#define SPRD_DMA_SWT_MODE_OFFSET 26
#define SPRD_DMA_REQ_MODE_OFFSET 24
#define SPRD_DMA_REQ_MODE_MASK GENMASK(1, 0)
#define SPRD_DMA_WRAP_SEL_DEST BIT(23)
#define SPRD_DMA_WRAP_EN BIT(22)
#define SPRD_DMA_FIX_SEL_OFFSET 21
#define SPRD_DMA_FIX_EN_OFFSET 20
#define SPRD_DMA_LLIST_END BIT(19)
#define SPRD_DMA_FRG_LEN_MASK GENMASK(16, 0)
/* SPRD_DMA_CHN_BLK_LEN register definition */
#define SPRD_DMA_BLK_LEN_MASK GENMASK(16, 0)
/* SPRD_DMA_CHN_TRSC_LEN register definition */
#define SPRD_DMA_TRSC_LEN_MASK GENMASK(27, 0)
/* SPRD_DMA_CHN_TRSF_STEP register definition */
#define SPRD_DMA_DEST_TRSF_STEP_OFFSET 16
#define SPRD_DMA_SRC_TRSF_STEP_OFFSET 0
#define SPRD_DMA_TRSF_STEP_MASK GENMASK(15, 0)
/* SPRD DMA_SRC_BLK_STEP register definition */
#define SPRD_DMA_LLIST_HIGH_MASK GENMASK(31, 28)
#define SPRD_DMA_LLIST_HIGH_SHIFT 28
/* define DMA channel mode & trigger mode mask */
#define SPRD_DMA_CHN_MODE_MASK GENMASK(7, 0)
#define SPRD_DMA_TRG_MODE_MASK GENMASK(7, 0)
#define SPRD_DMA_INT_TYPE_MASK GENMASK(7, 0)
/* define the DMA transfer step type */
#define SPRD_DMA_NONE_STEP 0
#define SPRD_DMA_BYTE_STEP 1
#define SPRD_DMA_SHORT_STEP 2
#define SPRD_DMA_WORD_STEP 4
#define SPRD_DMA_DWORD_STEP 8
#define SPRD_DMA_SOFTWARE_UID 0
/* dma data width values */
enum sprd_dma_datawidth {
SPRD_DMA_DATAWIDTH_1_BYTE,
SPRD_DMA_DATAWIDTH_2_BYTES,
SPRD_DMA_DATAWIDTH_4_BYTES,
SPRD_DMA_DATAWIDTH_8_BYTES,
};
/* dma channel hardware configuration */
struct sprd_dma_chn_hw {
u32 pause;
u32 req;
u32 cfg;
u32 intc;
u32 src_addr;
u32 des_addr;
u32 frg_len;
u32 blk_len;
u32 trsc_len;
u32 trsf_step;
u32 wrap_ptr;
u32 wrap_to;
u32 llist_ptr;
u32 frg_step;
u32 src_blk_step;
u32 des_blk_step;
};
/* dma request description */
struct sprd_dma_desc {
struct virt_dma_desc vd;
struct sprd_dma_chn_hw chn_hw;
enum dma_transfer_direction dir;
};
/* dma channel description */
struct sprd_dma_chn {
struct virt_dma_chan vc;
void __iomem *chn_base;
struct sprd_dma_linklist linklist;
struct dma_slave_config slave_cfg;
u32 chn_num;
u32 dev_id;
enum sprd_dma_chn_mode chn_mode;
enum sprd_dma_trg_mode trg_mode;
enum sprd_dma_int_type int_type;
struct sprd_dma_desc *cur_desc;
};
/* SPRD dma device */
struct sprd_dma_dev {
struct dma_device dma_dev;
void __iomem *glb_base;
struct clk *clk;
struct clk *ashb_clk;
int irq;
u32 total_chns;
struct sprd_dma_chn channels[];
};
static void sprd_dma_free_desc(struct virt_dma_desc *vd);
static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param);
static struct of_dma_filter_info sprd_dma_info = {
.filter_fn = sprd_dma_filter_fn,
};
static inline struct sprd_dma_chn *to_sprd_dma_chan(struct dma_chan *c)
{
return container_of(c, struct sprd_dma_chn, vc.chan);
}
static inline struct sprd_dma_dev *to_sprd_dma_dev(struct dma_chan *c)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(c);
return container_of(schan, struct sprd_dma_dev, channels[c->chan_id]);
}
static inline struct sprd_dma_desc *to_sprd_dma_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct sprd_dma_desc, vd);
}
static void sprd_dma_glb_update(struct sprd_dma_dev *sdev, u32 reg,
u32 mask, u32 val)
{
u32 orig = readl(sdev->glb_base + reg);
u32 tmp;
tmp = (orig & ~mask) | val;
writel(tmp, sdev->glb_base + reg);
}
static void sprd_dma_chn_update(struct sprd_dma_chn *schan, u32 reg,
u32 mask, u32 val)
{
u32 orig = readl(schan->chn_base + reg);
u32 tmp;
tmp = (orig & ~mask) | val;
writel(tmp, schan->chn_base + reg);
}
static int sprd_dma_enable(struct sprd_dma_dev *sdev)
{
int ret;
ret = clk_prepare_enable(sdev->clk);
if (ret)
return ret;
/*
* The ashb_clk is optional and only for AGCP DMA controller, so we
* need add one condition to check if the ashb_clk need enable.
*/
if (!IS_ERR(sdev->ashb_clk))
ret = clk_prepare_enable(sdev->ashb_clk);
return ret;
}
static void sprd_dma_disable(struct sprd_dma_dev *sdev)
{
clk_disable_unprepare(sdev->clk);
/*
* Need to check if we need disable the optional ashb_clk for AGCP DMA.
*/
if (!IS_ERR(sdev->ashb_clk))
clk_disable_unprepare(sdev->ashb_clk);
}
static void sprd_dma_set_uid(struct sprd_dma_chn *schan)
{
struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
u32 dev_id = schan->dev_id;
if (dev_id != SPRD_DMA_SOFTWARE_UID) {
u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET +
SPRD_DMA_GLB_REQ_UID(dev_id);
writel(schan->chn_num + 1, sdev->glb_base + uid_offset);
}
}
static void sprd_dma_unset_uid(struct sprd_dma_chn *schan)
{
struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
u32 dev_id = schan->dev_id;
if (dev_id != SPRD_DMA_SOFTWARE_UID) {
u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET +
SPRD_DMA_GLB_REQ_UID(dev_id);
writel(0, sdev->glb_base + uid_offset);
}
}
static void sprd_dma_clear_int(struct sprd_dma_chn *schan)
{
sprd_dma_chn_update(schan, SPRD_DMA_CHN_INTC,
SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET,
SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET);
}
static void sprd_dma_enable_chn(struct sprd_dma_chn *schan)
{
sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN,
SPRD_DMA_CHN_EN);
}
static void sprd_dma_disable_chn(struct sprd_dma_chn *schan)
{
sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN, 0);
}
static void sprd_dma_soft_request(struct sprd_dma_chn *schan)
{
sprd_dma_chn_update(schan, SPRD_DMA_CHN_REQ, SPRD_DMA_REQ_EN,
SPRD_DMA_REQ_EN);
}
static void sprd_dma_pause_resume(struct sprd_dma_chn *schan, bool enable)
{
struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
u32 pause, timeout = SPRD_DMA_PAUSE_CNT;
if (enable) {
sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE,
SPRD_DMA_PAUSE_EN, SPRD_DMA_PAUSE_EN);
do {
pause = readl(schan->chn_base + SPRD_DMA_CHN_PAUSE);
if (pause & SPRD_DMA_PAUSE_STS)
break;
cpu_relax();
} while (--timeout > 0);
if (!timeout)
dev_warn(sdev->dma_dev.dev,
"pause dma controller timeout\n");
} else {
sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE,
SPRD_DMA_PAUSE_EN, 0);
}
}
static void sprd_dma_stop_and_disable(struct sprd_dma_chn *schan)
{
u32 cfg = readl(schan->chn_base + SPRD_DMA_CHN_CFG);
if (!(cfg & SPRD_DMA_CHN_EN))
return;
sprd_dma_pause_resume(schan, true);
sprd_dma_disable_chn(schan);
}
static unsigned long sprd_dma_get_src_addr(struct sprd_dma_chn *schan)
{
unsigned long addr, addr_high;
addr = readl(schan->chn_base + SPRD_DMA_CHN_SRC_ADDR);
addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_PTR) &
SPRD_DMA_HIGH_ADDR_MASK;
return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET);
}
static unsigned long sprd_dma_get_dst_addr(struct sprd_dma_chn *schan)
{
unsigned long addr, addr_high;
addr = readl(schan->chn_base + SPRD_DMA_CHN_DES_ADDR);
addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_TO) &
SPRD_DMA_HIGH_ADDR_MASK;
return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET);
}
static enum sprd_dma_int_type sprd_dma_get_int_type(struct sprd_dma_chn *schan)
{
struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
u32 intc_sts = readl(schan->chn_base + SPRD_DMA_CHN_INTC) &
SPRD_DMA_CHN_INT_STS;
switch (intc_sts) {
case SPRD_DMA_CFGERR_INT_STS:
return SPRD_DMA_CFGERR_INT;
case SPRD_DMA_LIST_INT_STS:
return SPRD_DMA_LIST_INT;
case SPRD_DMA_TRSC_INT_STS:
return SPRD_DMA_TRANS_INT;
case SPRD_DMA_BLK_INT_STS:
return SPRD_DMA_BLK_INT;
case SPRD_DMA_FRAG_INT_STS:
return SPRD_DMA_FRAG_INT;
default:
dev_warn(sdev->dma_dev.dev, "incorrect dma interrupt type\n");
return SPRD_DMA_NO_INT;
}
}
static enum sprd_dma_req_mode sprd_dma_get_req_type(struct sprd_dma_chn *schan)
{
u32 frag_reg = readl(schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
return (frag_reg >> SPRD_DMA_REQ_MODE_OFFSET) & SPRD_DMA_REQ_MODE_MASK;
}
static int sprd_dma_set_2stage_config(struct sprd_dma_chn *schan)
{
struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
u32 val, chn = schan->chn_num + 1;
switch (schan->chn_mode) {
case SPRD_DMA_SRC_CHN0:
val = chn & SPRD_DMA_GLB_SRC_CHN_MASK;
val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET;
val |= SPRD_DMA_GLB_2STAGE_EN;
if (schan->int_type != SPRD_DMA_NO_INT)
val |= SPRD_DMA_GLB_SRC_INT;
sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val);
break;
case SPRD_DMA_SRC_CHN1:
val = chn & SPRD_DMA_GLB_SRC_CHN_MASK;
val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET;
val |= SPRD_DMA_GLB_2STAGE_EN;
if (schan->int_type != SPRD_DMA_NO_INT)
val |= SPRD_DMA_GLB_SRC_INT;
sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val);
break;
case SPRD_DMA_DST_CHN0:
val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) &
SPRD_DMA_GLB_DEST_CHN_MASK;
val |= SPRD_DMA_GLB_2STAGE_EN;
if (schan->int_type != SPRD_DMA_NO_INT)
val |= SPRD_DMA_GLB_DEST_INT;
sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val);
break;
case SPRD_DMA_DST_CHN1:
val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) &
SPRD_DMA_GLB_DEST_CHN_MASK;
val |= SPRD_DMA_GLB_2STAGE_EN;
if (schan->int_type != SPRD_DMA_NO_INT)
val |= SPRD_DMA_GLB_DEST_INT;
sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val);
break;
default:
dev_err(sdev->dma_dev.dev, "invalid channel mode setting %d\n",
schan->chn_mode);
return -EINVAL;
}
return 0;
}
static void sprd_dma_set_pending(struct sprd_dma_chn *schan, bool enable)
{
struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
u32 reg, val, req_id;
if (schan->dev_id == SPRD_DMA_SOFTWARE_UID)
return;
/* The DMA request id always starts from 0. */
req_id = schan->dev_id - 1;
if (req_id < 32) {
reg = SPRD_DMA_GLB_REQ_PEND0_EN;
val = BIT(req_id);
} else {
reg = SPRD_DMA_GLB_REQ_PEND1_EN;
val = BIT(req_id - 32);
}
sprd_dma_glb_update(sdev, reg, val, enable ? val : 0);
}
static void sprd_dma_set_chn_config(struct sprd_dma_chn *schan,
struct sprd_dma_desc *sdesc)
{
struct sprd_dma_chn_hw *cfg = &sdesc->chn_hw;
writel(cfg->pause, schan->chn_base + SPRD_DMA_CHN_PAUSE);
writel(cfg->cfg, schan->chn_base + SPRD_DMA_CHN_CFG);
writel(cfg->intc, schan->chn_base + SPRD_DMA_CHN_INTC);
writel(cfg->src_addr, schan->chn_base + SPRD_DMA_CHN_SRC_ADDR);
writel(cfg->des_addr, schan->chn_base + SPRD_DMA_CHN_DES_ADDR);
writel(cfg->frg_len, schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
writel(cfg->blk_len, schan->chn_base + SPRD_DMA_CHN_BLK_LEN);
writel(cfg->trsc_len, schan->chn_base + SPRD_DMA_CHN_TRSC_LEN);
writel(cfg->trsf_step, schan->chn_base + SPRD_DMA_CHN_TRSF_STEP);
writel(cfg->wrap_ptr, schan->chn_base + SPRD_DMA_CHN_WARP_PTR);
writel(cfg->wrap_to, schan->chn_base + SPRD_DMA_CHN_WARP_TO);
writel(cfg->llist_ptr, schan->chn_base + SPRD_DMA_CHN_LLIST_PTR);
writel(cfg->frg_step, schan->chn_base + SPRD_DMA_CHN_FRAG_STEP);
writel(cfg->src_blk_step, schan->chn_base + SPRD_DMA_CHN_SRC_BLK_STEP);
writel(cfg->des_blk_step, schan->chn_base + SPRD_DMA_CHN_DES_BLK_STEP);
writel(cfg->req, schan->chn_base + SPRD_DMA_CHN_REQ);
}
static void sprd_dma_start(struct sprd_dma_chn *schan)
{
struct virt_dma_desc *vd = vchan_next_desc(&schan->vc);
if (!vd)
return;
list_del(&vd->node);
schan->cur_desc = to_sprd_dma_desc(vd);
/*
* Set 2-stage configuration if the channel starts one 2-stage
* transfer.
*/
if (schan->chn_mode && sprd_dma_set_2stage_config(schan))
return;
/*
* Copy the DMA configuration from DMA descriptor to this hardware
* channel.
*/
sprd_dma_set_chn_config(schan, schan->cur_desc);
sprd_dma_set_uid(schan);
sprd_dma_set_pending(schan, true);
sprd_dma_enable_chn(schan);
if (schan->dev_id == SPRD_DMA_SOFTWARE_UID &&
schan->chn_mode != SPRD_DMA_DST_CHN0 &&
schan->chn_mode != SPRD_DMA_DST_CHN1)
sprd_dma_soft_request(schan);
}
static void sprd_dma_stop(struct sprd_dma_chn *schan)
{
sprd_dma_stop_and_disable(schan);
sprd_dma_set_pending(schan, false);
sprd_dma_unset_uid(schan);
sprd_dma_clear_int(schan);
schan->cur_desc = NULL;
}
static bool sprd_dma_check_trans_done(struct sprd_dma_desc *sdesc,
enum sprd_dma_int_type int_type,
enum sprd_dma_req_mode req_mode)
{
if (int_type == SPRD_DMA_NO_INT)
return false;
if (int_type >= req_mode + 1)
return true;
else
return false;
}
static irqreturn_t dma_irq_handle(int irq, void *dev_id)
{
struct sprd_dma_dev *sdev = (struct sprd_dma_dev *)dev_id;
u32 irq_status = readl(sdev->glb_base + SPRD_DMA_GLB_INT_MSK_STS);
struct sprd_dma_chn *schan;
struct sprd_dma_desc *sdesc;
enum sprd_dma_req_mode req_type;
enum sprd_dma_int_type int_type;
bool trans_done = false, cyclic = false;
u32 i;
while (irq_status) {
i = __ffs(irq_status);
irq_status &= (irq_status - 1);
schan = &sdev->channels[i];
spin_lock(&schan->vc.lock);
sdesc = schan->cur_desc;
if (!sdesc) {
spin_unlock(&schan->vc.lock);
return IRQ_HANDLED;
}
int_type = sprd_dma_get_int_type(schan);
req_type = sprd_dma_get_req_type(schan);
sprd_dma_clear_int(schan);
/* cyclic mode schedule callback */
cyclic = schan->linklist.phy_addr ? true : false;
if (cyclic == true) {
vchan_cyclic_callback(&sdesc->vd);
} else {
/* Check if the dma request descriptor is done. */
trans_done = sprd_dma_check_trans_done(sdesc, int_type,
req_type);
if (trans_done == true) {
vchan_cookie_complete(&sdesc->vd);
schan->cur_desc = NULL;
sprd_dma_start(schan);
}
}
spin_unlock(&schan->vc.lock);
}
return IRQ_HANDLED;
}
static int sprd_dma_alloc_chan_resources(struct dma_chan *chan)
{
return pm_runtime_get_sync(chan->device->dev);
}
static void sprd_dma_free_chan_resources(struct dma_chan *chan)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
struct virt_dma_desc *cur_vd = NULL;
unsigned long flags;
spin_lock_irqsave(&schan->vc.lock, flags);
if (schan->cur_desc)
cur_vd = &schan->cur_desc->vd;
sprd_dma_stop(schan);
spin_unlock_irqrestore(&schan->vc.lock, flags);
if (cur_vd)
sprd_dma_free_desc(cur_vd);
vchan_free_chan_resources(&schan->vc);
pm_runtime_put(chan->device->dev);
}
static enum dma_status sprd_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
struct virt_dma_desc *vd;
unsigned long flags;
enum dma_status ret;
u32 pos;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&schan->vc.lock, flags);
vd = vchan_find_desc(&schan->vc, cookie);
if (vd) {
struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
struct sprd_dma_chn_hw *hw = &sdesc->chn_hw;
if (hw->trsc_len > 0)
pos = hw->trsc_len;
else if (hw->blk_len > 0)
pos = hw->blk_len;
else if (hw->frg_len > 0)
pos = hw->frg_len;
else
pos = 0;
} else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) {
struct sprd_dma_desc *sdesc = schan->cur_desc;
if (sdesc->dir == DMA_DEV_TO_MEM)
pos = sprd_dma_get_dst_addr(schan);
else
pos = sprd_dma_get_src_addr(schan);
} else {
pos = 0;
}
spin_unlock_irqrestore(&schan->vc.lock, flags);
dma_set_residue(txstate, pos);
return ret;
}
static void sprd_dma_issue_pending(struct dma_chan *chan)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&schan->vc.lock, flags);
if (vchan_issue_pending(&schan->vc) && !schan->cur_desc)
sprd_dma_start(schan);
spin_unlock_irqrestore(&schan->vc.lock, flags);
}
static int sprd_dma_get_datawidth(enum dma_slave_buswidth buswidth)
{
switch (buswidth) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
case DMA_SLAVE_BUSWIDTH_2_BYTES:
case DMA_SLAVE_BUSWIDTH_4_BYTES:
case DMA_SLAVE_BUSWIDTH_8_BYTES:
return ffs(buswidth) - 1;
default:
return -EINVAL;
}
}
static int sprd_dma_get_step(enum dma_slave_buswidth buswidth)
{
switch (buswidth) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
case DMA_SLAVE_BUSWIDTH_2_BYTES:
case DMA_SLAVE_BUSWIDTH_4_BYTES:
case DMA_SLAVE_BUSWIDTH_8_BYTES:
return buswidth;
default:
return -EINVAL;
}
}
static int sprd_dma_fill_desc(struct dma_chan *chan,
struct sprd_dma_chn_hw *hw,
unsigned int sglen, int sg_index,
dma_addr_t src, dma_addr_t dst, u32 len,
enum dma_transfer_direction dir,
unsigned long flags,
struct dma_slave_config *slave_cfg)
{
struct sprd_dma_dev *sdev = to_sprd_dma_dev(chan);
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
enum sprd_dma_chn_mode chn_mode = schan->chn_mode;
u32 req_mode = (flags >> SPRD_DMA_REQ_SHIFT) & SPRD_DMA_REQ_MODE_MASK;
u32 int_mode = flags & SPRD_DMA_INT_MASK;
int src_datawidth, dst_datawidth, src_step, dst_step;
u32 temp, fix_mode = 0, fix_en = 0;
phys_addr_t llist_ptr;
if (dir == DMA_MEM_TO_DEV) {
src_step = sprd_dma_get_step(slave_cfg->src_addr_width);
if (src_step < 0) {
dev_err(sdev->dma_dev.dev, "invalid source step\n");
return src_step;
}
/*
* For 2-stage transfer, destination channel step can not be 0,
* since destination device is AON IRAM.
*/
if (chn_mode == SPRD_DMA_DST_CHN0 ||
chn_mode == SPRD_DMA_DST_CHN1)
dst_step = src_step;
else
dst_step = SPRD_DMA_NONE_STEP;
} else {
dst_step = sprd_dma_get_step(slave_cfg->dst_addr_width);
if (dst_step < 0) {
dev_err(sdev->dma_dev.dev, "invalid destination step\n");
return dst_step;
}
src_step = SPRD_DMA_NONE_STEP;
}
src_datawidth = sprd_dma_get_datawidth(slave_cfg->src_addr_width);
if (src_datawidth < 0) {
dev_err(sdev->dma_dev.dev, "invalid source datawidth\n");
return src_datawidth;
}
dst_datawidth = sprd_dma_get_datawidth(slave_cfg->dst_addr_width);
if (dst_datawidth < 0) {
dev_err(sdev->dma_dev.dev, "invalid destination datawidth\n");
return dst_datawidth;
}
hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET;
/*
* wrap_ptr and wrap_to will save the high 4 bits source address and
* destination address.
*/
hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK;
hw->wrap_to = (dst >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK;
hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK;
hw->des_addr = dst & SPRD_DMA_LOW_ADDR_MASK;
/*
* If the src step and dst step both are 0 or both are not 0, that means
* we can not enable the fix mode. If one is 0 and another one is not,
* we can enable the fix mode.
*/
if ((src_step != 0 && dst_step != 0) || (src_step | dst_step) == 0) {
fix_en = 0;
} else {
fix_en = 1;
if (src_step)
fix_mode = 1;
else
fix_mode = 0;
}
hw->intc = int_mode | SPRD_DMA_CFG_ERR_INT_EN;
temp = src_datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET;
temp |= dst_datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET;
temp |= req_mode << SPRD_DMA_REQ_MODE_OFFSET;
temp |= fix_mode << SPRD_DMA_FIX_SEL_OFFSET;
temp |= fix_en << SPRD_DMA_FIX_EN_OFFSET;
temp |= schan->linklist.wrap_addr ?
SPRD_DMA_WRAP_EN | SPRD_DMA_WRAP_SEL_DEST : 0;
temp |= slave_cfg->src_maxburst & SPRD_DMA_FRG_LEN_MASK;
hw->frg_len = temp;
hw->blk_len = slave_cfg->src_maxburst & SPRD_DMA_BLK_LEN_MASK;
hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK;
temp = (dst_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET;
temp |= (src_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET;
hw->trsf_step = temp;
/* link-list configuration */
if (schan->linklist.phy_addr) {
hw->cfg |= SPRD_DMA_LINKLIST_EN;
/* link-list index */
temp = sglen ? (sg_index + 1) % sglen : 0;
/* Next link-list configuration's physical address offset */
temp = temp * sizeof(*hw) + SPRD_DMA_CHN_SRC_ADDR;
/*
* Set the link-list pointer point to next link-list
* configuration's physical address.
*/
llist_ptr = schan->linklist.phy_addr + temp;
hw->llist_ptr = lower_32_bits(llist_ptr);
hw->src_blk_step = (upper_32_bits(llist_ptr) << SPRD_DMA_LLIST_HIGH_SHIFT) &
SPRD_DMA_LLIST_HIGH_MASK;
if (schan->linklist.wrap_addr) {
hw->wrap_ptr |= schan->linklist.wrap_addr &
SPRD_DMA_WRAP_ADDR_MASK;
hw->wrap_to |= dst & SPRD_DMA_WRAP_ADDR_MASK;
}
} else {
hw->llist_ptr = 0;
hw->src_blk_step = 0;
}
hw->frg_step = 0;
hw->des_blk_step = 0;
return 0;
}
static int sprd_dma_fill_linklist_desc(struct dma_chan *chan,
unsigned int sglen, int sg_index,
dma_addr_t src, dma_addr_t dst, u32 len,
enum dma_transfer_direction dir,
unsigned long flags,
struct dma_slave_config *slave_cfg)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
struct sprd_dma_chn_hw *hw;
if (!schan->linklist.virt_addr)
return -EINVAL;
hw = (struct sprd_dma_chn_hw *)(schan->linklist.virt_addr +
sg_index * sizeof(*hw));
return sprd_dma_fill_desc(chan, hw, sglen, sg_index, src, dst, len,
dir, flags, slave_cfg);
}
static struct dma_async_tx_descriptor *
sprd_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
struct sprd_dma_desc *sdesc;
struct sprd_dma_chn_hw *hw;
enum sprd_dma_datawidth datawidth;
u32 step, temp;
sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
if (!sdesc)
return NULL;
hw = &sdesc->chn_hw;
hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET;
hw->intc = SPRD_DMA_TRANS_INT | SPRD_DMA_CFG_ERR_INT_EN;
hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK;
hw->des_addr = dest & SPRD_DMA_LOW_ADDR_MASK;
hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) &
SPRD_DMA_HIGH_ADDR_MASK;
hw->wrap_to = (dest >> SPRD_DMA_HIGH_ADDR_OFFSET) &
SPRD_DMA_HIGH_ADDR_MASK;
if (IS_ALIGNED(len, 8)) {
datawidth = SPRD_DMA_DATAWIDTH_8_BYTES;
step = SPRD_DMA_DWORD_STEP;
} else if (IS_ALIGNED(len, 4)) {
datawidth = SPRD_DMA_DATAWIDTH_4_BYTES;
step = SPRD_DMA_WORD_STEP;
} else if (IS_ALIGNED(len, 2)) {
datawidth = SPRD_DMA_DATAWIDTH_2_BYTES;
step = SPRD_DMA_SHORT_STEP;
} else {
datawidth = SPRD_DMA_DATAWIDTH_1_BYTE;
step = SPRD_DMA_BYTE_STEP;
}
temp = datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET;
temp |= datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET;
temp |= SPRD_DMA_TRANS_REQ << SPRD_DMA_REQ_MODE_OFFSET;
temp |= len & SPRD_DMA_FRG_LEN_MASK;
hw->frg_len = temp;
hw->blk_len = len & SPRD_DMA_BLK_LEN_MASK;
hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK;
temp = (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET;
temp |= (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET;
hw->trsf_step = temp;
return vchan_tx_prep(&schan->vc, &sdesc->vd, flags);
}
static struct dma_async_tx_descriptor *
sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sglen, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
struct dma_slave_config *slave_cfg = &schan->slave_cfg;
dma_addr_t src = 0, dst = 0;
dma_addr_t start_src = 0, start_dst = 0;
struct sprd_dma_desc *sdesc;
struct scatterlist *sg;
u32 len = 0;
int ret, i;
if (!is_slave_direction(dir))
return NULL;
if (context) {
struct sprd_dma_linklist *ll_cfg =
(struct sprd_dma_linklist *)context;
schan->linklist.phy_addr = ll_cfg->phy_addr;
schan->linklist.virt_addr = ll_cfg->virt_addr;
schan->linklist.wrap_addr = ll_cfg->wrap_addr;
} else {
schan->linklist.phy_addr = 0;
schan->linklist.virt_addr = 0;
schan->linklist.wrap_addr = 0;
}
/*
* Set channel mode, interrupt mode and trigger mode for 2-stage
* transfer.
*/
schan->chn_mode =
(flags >> SPRD_DMA_CHN_MODE_SHIFT) & SPRD_DMA_CHN_MODE_MASK;
schan->trg_mode =
(flags >> SPRD_DMA_TRG_MODE_SHIFT) & SPRD_DMA_TRG_MODE_MASK;
schan->int_type = flags & SPRD_DMA_INT_TYPE_MASK;
sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
if (!sdesc)
return NULL;
sdesc->dir = dir;
for_each_sg(sgl, sg, sglen, i) {
len = sg_dma_len(sg);
if (dir == DMA_MEM_TO_DEV) {
src = sg_dma_address(sg);
dst = slave_cfg->dst_addr;
} else {
src = slave_cfg->src_addr;
dst = sg_dma_address(sg);
}
if (!i) {
start_src = src;
start_dst = dst;
}
/*
* The link-list mode needs at least 2 link-list
* configurations. If there is only one sg, it doesn't
* need to fill the link-list configuration.
*/
if (sglen < 2)
break;
ret = sprd_dma_fill_linklist_desc(chan, sglen, i, src, dst, len,
dir, flags, slave_cfg);
if (ret) {
kfree(sdesc);
return NULL;
}
}
ret = sprd_dma_fill_desc(chan, &sdesc->chn_hw, 0, 0, start_src,
start_dst, len, dir, flags, slave_cfg);
if (ret) {
kfree(sdesc);
return NULL;
}
return vchan_tx_prep(&schan->vc, &sdesc->vd, flags);
}
static int sprd_dma_slave_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
struct dma_slave_config *slave_cfg = &schan->slave_cfg;
memcpy(slave_cfg, config, sizeof(*config));
return 0;
}
static int sprd_dma_pause(struct dma_chan *chan)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&schan->vc.lock, flags);
sprd_dma_pause_resume(schan, true);
spin_unlock_irqrestore(&schan->vc.lock, flags);
return 0;
}
static int sprd_dma_resume(struct dma_chan *chan)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&schan->vc.lock, flags);
sprd_dma_pause_resume(schan, false);
spin_unlock_irqrestore(&schan->vc.lock, flags);
return 0;
}
static int sprd_dma_terminate_all(struct dma_chan *chan)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
struct virt_dma_desc *cur_vd = NULL;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&schan->vc.lock, flags);
if (schan->cur_desc)
cur_vd = &schan->cur_desc->vd;
sprd_dma_stop(schan);
vchan_get_all_descriptors(&schan->vc, &head);
spin_unlock_irqrestore(&schan->vc.lock, flags);
if (cur_vd)
sprd_dma_free_desc(cur_vd);
vchan_dma_desc_free_list(&schan->vc, &head);
return 0;
}
static void sprd_dma_free_desc(struct virt_dma_desc *vd)
{
struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
kfree(sdesc);
}
static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param)
{
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
u32 slave_id = *(u32 *)param;
schan->dev_id = slave_id;
return true;
}
static int sprd_dma_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct sprd_dma_dev *sdev;
struct sprd_dma_chn *dma_chn;
u32 chn_count;
int ret, i;
/* Parse new and deprecated dma-channels properties */
ret = device_property_read_u32(&pdev->dev, "dma-channels", &chn_count);
if (ret)
ret = device_property_read_u32(&pdev->dev, "#dma-channels",
&chn_count);
if (ret) {
dev_err(&pdev->dev, "get dma channels count failed\n");
return ret;
}
sdev = devm_kzalloc(&pdev->dev,
struct_size(sdev, channels, chn_count),
GFP_KERNEL);
if (!sdev)
return -ENOMEM;
sdev->clk = devm_clk_get(&pdev->dev, "enable");
if (IS_ERR(sdev->clk)) {
dev_err(&pdev->dev, "get enable clock failed\n");
return PTR_ERR(sdev->clk);
}
/* ashb clock is optional for AGCP DMA */
sdev->ashb_clk = devm_clk_get(&pdev->dev, "ashb_eb");
if (IS_ERR(sdev->ashb_clk))
dev_warn(&pdev->dev, "no optional ashb eb clock\n");
/*
* We have three DMA controllers: AP DMA, AON DMA and AGCP DMA. For AGCP
* DMA controller, it can or do not request the irq, which will save
* system power without resuming system by DMA interrupts if AGCP DMA
* does not request the irq. Thus the DMA interrupts property should
* be optional.
*/
sdev->irq = platform_get_irq(pdev, 0);
if (sdev->irq > 0) {
ret = devm_request_irq(&pdev->dev, sdev->irq, dma_irq_handle,
0, "sprd_dma", (void *)sdev);
if (ret < 0) {
dev_err(&pdev->dev, "request dma irq failed\n");
return ret;
}
} else {
dev_warn(&pdev->dev, "no interrupts for the dma controller\n");
}
sdev->glb_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(sdev->glb_base))
return PTR_ERR(sdev->glb_base);
dma_cap_set(DMA_MEMCPY, sdev->dma_dev.cap_mask);
sdev->total_chns = chn_count;
INIT_LIST_HEAD(&sdev->dma_dev.channels);
INIT_LIST_HEAD(&sdev->dma_dev.global_node);
sdev->dma_dev.dev = &pdev->dev;
sdev->dma_dev.device_alloc_chan_resources = sprd_dma_alloc_chan_resources;
sdev->dma_dev.device_free_chan_resources = sprd_dma_free_chan_resources;
sdev->dma_dev.device_tx_status = sprd_dma_tx_status;
sdev->dma_dev.device_issue_pending = sprd_dma_issue_pending;
sdev->dma_dev.device_prep_dma_memcpy = sprd_dma_prep_dma_memcpy;
sdev->dma_dev.device_prep_slave_sg = sprd_dma_prep_slave_sg;
sdev->dma_dev.device_config = sprd_dma_slave_config;
sdev->dma_dev.device_pause = sprd_dma_pause;
sdev->dma_dev.device_resume = sprd_dma_resume;
sdev->dma_dev.device_terminate_all = sprd_dma_terminate_all;
for (i = 0; i < chn_count; i++) {
dma_chn = &sdev->channels[i];
dma_chn->chn_num = i;
dma_chn->cur_desc = NULL;
/* get each channel's registers base address. */
dma_chn->chn_base = sdev->glb_base + SPRD_DMA_CHN_REG_OFFSET +
SPRD_DMA_CHN_REG_LENGTH * i;
dma_chn->vc.desc_free = sprd_dma_free_desc;
vchan_init(&dma_chn->vc, &sdev->dma_dev);
}
platform_set_drvdata(pdev, sdev);
ret = sprd_dma_enable(sdev);
if (ret)
return ret;
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_get_sync(&pdev->dev);
if (ret < 0)
goto err_rpm;
ret = dma_async_device_register(&sdev->dma_dev);
if (ret < 0) {
dev_err(&pdev->dev, "register dma device failed:%d\n", ret);
goto err_register;
}
sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask;
ret = of_dma_controller_register(np, of_dma_simple_xlate,
&sprd_dma_info);
if (ret)
goto err_of_register;
pm_runtime_put(&pdev->dev);
return 0;
err_of_register:
dma_async_device_unregister(&sdev->dma_dev);
err_register:
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
err_rpm:
sprd_dma_disable(sdev);
return ret;
}
static int sprd_dma_remove(struct platform_device *pdev)
{
struct sprd_dma_dev *sdev = platform_get_drvdata(pdev);
struct sprd_dma_chn *c, *cn;
pm_runtime_get_sync(&pdev->dev);
/* explicitly free the irq */
if (sdev->irq > 0)
devm_free_irq(&pdev->dev, sdev->irq, sdev);
list_for_each_entry_safe(c, cn, &sdev->dma_dev.channels,
vc.chan.device_node) {
list_del(&c->vc.chan.device_node);
tasklet_kill(&c->vc.task);
}
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&sdev->dma_dev);
sprd_dma_disable(sdev);
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
static const struct of_device_id sprd_dma_match[] = {
{ .compatible = "sprd,sc9860-dma", },
{},
};
MODULE_DEVICE_TABLE(of, sprd_dma_match);
static int __maybe_unused sprd_dma_runtime_suspend(struct device *dev)
{
struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
sprd_dma_disable(sdev);
return 0;
}
static int __maybe_unused sprd_dma_runtime_resume(struct device *dev)
{
struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
int ret;
ret = sprd_dma_enable(sdev);
if (ret)
dev_err(sdev->dma_dev.dev, "enable dma failed\n");
return ret;
}
static const struct dev_pm_ops sprd_dma_pm_ops = {
SET_RUNTIME_PM_OPS(sprd_dma_runtime_suspend,
sprd_dma_runtime_resume,
NULL)
};
static struct platform_driver sprd_dma_driver = {
.probe = sprd_dma_probe,
.remove = sprd_dma_remove,
.driver = {
.name = "sprd-dma",
.of_match_table = sprd_dma_match,
.pm = &sprd_dma_pm_ops,
},
};
module_platform_driver(sprd_dma_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DMA driver for Spreadtrum");
MODULE_AUTHOR("Baolin Wang <[email protected]>");
MODULE_AUTHOR("Eric Long <[email protected]>");
MODULE_ALIAS("platform:sprd-dma");
| linux-master | drivers/dma/sprd-dma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Ingenic JZ4780 DMA controller
*
* Copyright (c) 2015 Imagination Technologies
* Author: Alex Smith <[email protected]>
*/
#include <linux/clk.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "dmaengine.h"
#include "virt-dma.h"
/* Global registers. */
#define JZ_DMA_REG_DMAC 0x00
#define JZ_DMA_REG_DIRQP 0x04
#define JZ_DMA_REG_DDR 0x08
#define JZ_DMA_REG_DDRS 0x0c
#define JZ_DMA_REG_DCKE 0x10
#define JZ_DMA_REG_DCKES 0x14
#define JZ_DMA_REG_DCKEC 0x18
#define JZ_DMA_REG_DMACP 0x1c
#define JZ_DMA_REG_DSIRQP 0x20
#define JZ_DMA_REG_DSIRQM 0x24
#define JZ_DMA_REG_DCIRQP 0x28
#define JZ_DMA_REG_DCIRQM 0x2c
/* Per-channel registers. */
#define JZ_DMA_REG_CHAN(n) (n * 0x20)
#define JZ_DMA_REG_DSA 0x00
#define JZ_DMA_REG_DTA 0x04
#define JZ_DMA_REG_DTC 0x08
#define JZ_DMA_REG_DRT 0x0c
#define JZ_DMA_REG_DCS 0x10
#define JZ_DMA_REG_DCM 0x14
#define JZ_DMA_REG_DDA 0x18
#define JZ_DMA_REG_DSD 0x1c
#define JZ_DMA_DMAC_DMAE BIT(0)
#define JZ_DMA_DMAC_AR BIT(2)
#define JZ_DMA_DMAC_HLT BIT(3)
#define JZ_DMA_DMAC_FAIC BIT(27)
#define JZ_DMA_DMAC_FMSC BIT(31)
#define JZ_DMA_DRT_AUTO 0x8
#define JZ_DMA_DCS_CTE BIT(0)
#define JZ_DMA_DCS_HLT BIT(2)
#define JZ_DMA_DCS_TT BIT(3)
#define JZ_DMA_DCS_AR BIT(4)
#define JZ_DMA_DCS_DES8 BIT(30)
#define JZ_DMA_DCM_LINK BIT(0)
#define JZ_DMA_DCM_TIE BIT(1)
#define JZ_DMA_DCM_STDE BIT(2)
#define JZ_DMA_DCM_TSZ_SHIFT 8
#define JZ_DMA_DCM_TSZ_MASK (0x7 << JZ_DMA_DCM_TSZ_SHIFT)
#define JZ_DMA_DCM_DP_SHIFT 12
#define JZ_DMA_DCM_SP_SHIFT 14
#define JZ_DMA_DCM_DAI BIT(22)
#define JZ_DMA_DCM_SAI BIT(23)
#define JZ_DMA_SIZE_4_BYTE 0x0
#define JZ_DMA_SIZE_1_BYTE 0x1
#define JZ_DMA_SIZE_2_BYTE 0x2
#define JZ_DMA_SIZE_16_BYTE 0x3
#define JZ_DMA_SIZE_32_BYTE 0x4
#define JZ_DMA_SIZE_64_BYTE 0x5
#define JZ_DMA_SIZE_128_BYTE 0x6
#define JZ_DMA_WIDTH_32_BIT 0x0
#define JZ_DMA_WIDTH_8_BIT 0x1
#define JZ_DMA_WIDTH_16_BIT 0x2
#define JZ_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
#define JZ4780_DMA_CTRL_OFFSET 0x1000
/* macros for use with jz4780_dma_soc_data.flags */
#define JZ_SOC_DATA_ALLOW_LEGACY_DT BIT(0)
#define JZ_SOC_DATA_PROGRAMMABLE_DMA BIT(1)
#define JZ_SOC_DATA_PER_CHAN_PM BIT(2)
#define JZ_SOC_DATA_NO_DCKES_DCKEC BIT(3)
#define JZ_SOC_DATA_BREAK_LINKS BIT(4)
/**
* struct jz4780_dma_hwdesc - descriptor structure read by the DMA controller.
* @dcm: value for the DCM (channel command) register
* @dsa: source address
* @dta: target address
* @dtc: transfer count (number of blocks of the transfer size specified in DCM
* to transfer) in the low 24 bits, offset of the next descriptor from the
* descriptor base address in the upper 8 bits.
*/
struct jz4780_dma_hwdesc {
u32 dcm;
u32 dsa;
u32 dta;
u32 dtc;
};
/* Size of allocations for hardware descriptor blocks. */
#define JZ_DMA_DESC_BLOCK_SIZE PAGE_SIZE
#define JZ_DMA_MAX_DESC \
(JZ_DMA_DESC_BLOCK_SIZE / sizeof(struct jz4780_dma_hwdesc))
struct jz4780_dma_desc {
struct virt_dma_desc vdesc;
struct jz4780_dma_hwdesc *desc;
dma_addr_t desc_phys;
unsigned int count;
enum dma_transaction_type type;
u32 transfer_type;
u32 status;
};
struct jz4780_dma_chan {
struct virt_dma_chan vchan;
unsigned int id;
struct dma_pool *desc_pool;
u32 transfer_type_tx, transfer_type_rx;
u32 transfer_shift;
struct dma_slave_config config;
struct jz4780_dma_desc *desc;
unsigned int curr_hwdesc;
};
struct jz4780_dma_soc_data {
unsigned int nb_channels;
unsigned int transfer_ord_max;
unsigned long flags;
};
struct jz4780_dma_dev {
struct dma_device dma_device;
void __iomem *chn_base;
void __iomem *ctrl_base;
struct clk *clk;
unsigned int irq;
const struct jz4780_dma_soc_data *soc_data;
u32 chan_reserved;
struct jz4780_dma_chan chan[];
};
struct jz4780_dma_filter_data {
u32 transfer_type_tx, transfer_type_rx;
int channel;
};
static inline struct jz4780_dma_chan *to_jz4780_dma_chan(struct dma_chan *chan)
{
return container_of(chan, struct jz4780_dma_chan, vchan.chan);
}
static inline struct jz4780_dma_desc *to_jz4780_dma_desc(
struct virt_dma_desc *vdesc)
{
return container_of(vdesc, struct jz4780_dma_desc, vdesc);
}
static inline struct jz4780_dma_dev *jz4780_dma_chan_parent(
struct jz4780_dma_chan *jzchan)
{
return container_of(jzchan->vchan.chan.device, struct jz4780_dma_dev,
dma_device);
}
static inline u32 jz4780_dma_chn_readl(struct jz4780_dma_dev *jzdma,
unsigned int chn, unsigned int reg)
{
return readl(jzdma->chn_base + reg + JZ_DMA_REG_CHAN(chn));
}
static inline void jz4780_dma_chn_writel(struct jz4780_dma_dev *jzdma,
unsigned int chn, unsigned int reg, u32 val)
{
writel(val, jzdma->chn_base + reg + JZ_DMA_REG_CHAN(chn));
}
static inline u32 jz4780_dma_ctrl_readl(struct jz4780_dma_dev *jzdma,
unsigned int reg)
{
return readl(jzdma->ctrl_base + reg);
}
static inline void jz4780_dma_ctrl_writel(struct jz4780_dma_dev *jzdma,
unsigned int reg, u32 val)
{
writel(val, jzdma->ctrl_base + reg);
}
static inline void jz4780_dma_chan_enable(struct jz4780_dma_dev *jzdma,
unsigned int chn)
{
if (jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM) {
unsigned int reg;
if (jzdma->soc_data->flags & JZ_SOC_DATA_NO_DCKES_DCKEC)
reg = JZ_DMA_REG_DCKE;
else
reg = JZ_DMA_REG_DCKES;
jz4780_dma_ctrl_writel(jzdma, reg, BIT(chn));
}
}
static inline void jz4780_dma_chan_disable(struct jz4780_dma_dev *jzdma,
unsigned int chn)
{
if ((jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM) &&
!(jzdma->soc_data->flags & JZ_SOC_DATA_NO_DCKES_DCKEC))
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKEC, BIT(chn));
}
static struct jz4780_dma_desc *
jz4780_dma_desc_alloc(struct jz4780_dma_chan *jzchan, unsigned int count,
enum dma_transaction_type type,
enum dma_transfer_direction direction)
{
struct jz4780_dma_desc *desc;
if (count > JZ_DMA_MAX_DESC)
return NULL;
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
desc->desc = dma_pool_alloc(jzchan->desc_pool, GFP_NOWAIT,
&desc->desc_phys);
if (!desc->desc) {
kfree(desc);
return NULL;
}
desc->count = count;
desc->type = type;
if (direction == DMA_DEV_TO_MEM)
desc->transfer_type = jzchan->transfer_type_rx;
else
desc->transfer_type = jzchan->transfer_type_tx;
return desc;
}
static void jz4780_dma_desc_free(struct virt_dma_desc *vdesc)
{
struct jz4780_dma_desc *desc = to_jz4780_dma_desc(vdesc);
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(vdesc->tx.chan);
dma_pool_free(jzchan->desc_pool, desc->desc, desc->desc_phys);
kfree(desc);
}
static u32 jz4780_dma_transfer_size(struct jz4780_dma_chan *jzchan,
unsigned long val, u32 *shift)
{
struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
int ord = ffs(val) - 1;
/*
* 8 byte transfer sizes unsupported so fall back on 4. If it's larger
* than the maximum, just limit it. It is perfectly safe to fall back
* in this way since we won't exceed the maximum burst size supported
* by the device, the only effect is reduced efficiency. This is better
* than refusing to perform the request at all.
*/
if (ord == 3)
ord = 2;
else if (ord > jzdma->soc_data->transfer_ord_max)
ord = jzdma->soc_data->transfer_ord_max;
*shift = ord;
switch (ord) {
case 0:
return JZ_DMA_SIZE_1_BYTE;
case 1:
return JZ_DMA_SIZE_2_BYTE;
case 2:
return JZ_DMA_SIZE_4_BYTE;
case 4:
return JZ_DMA_SIZE_16_BYTE;
case 5:
return JZ_DMA_SIZE_32_BYTE;
case 6:
return JZ_DMA_SIZE_64_BYTE;
default:
return JZ_DMA_SIZE_128_BYTE;
}
}
static int jz4780_dma_setup_hwdesc(struct jz4780_dma_chan *jzchan,
struct jz4780_dma_hwdesc *desc, dma_addr_t addr, size_t len,
enum dma_transfer_direction direction)
{
struct dma_slave_config *config = &jzchan->config;
u32 width, maxburst, tsz;
if (direction == DMA_MEM_TO_DEV) {
desc->dcm = JZ_DMA_DCM_SAI;
desc->dsa = addr;
desc->dta = config->dst_addr;
width = config->dst_addr_width;
maxburst = config->dst_maxburst;
} else {
desc->dcm = JZ_DMA_DCM_DAI;
desc->dsa = config->src_addr;
desc->dta = addr;
width = config->src_addr_width;
maxburst = config->src_maxburst;
}
/*
* This calculates the maximum transfer size that can be used with the
* given address, length, width and maximum burst size. The address
* must be aligned to the transfer size, the total length must be
* divisible by the transfer size, and we must not use more than the
* maximum burst specified by the user.
*/
tsz = jz4780_dma_transfer_size(jzchan, addr | len | (width * maxburst),
&jzchan->transfer_shift);
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
case DMA_SLAVE_BUSWIDTH_2_BYTES:
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
width = JZ_DMA_WIDTH_32_BIT;
break;
default:
return -EINVAL;
}
desc->dcm |= tsz << JZ_DMA_DCM_TSZ_SHIFT;
desc->dcm |= width << JZ_DMA_DCM_SP_SHIFT;
desc->dcm |= width << JZ_DMA_DCM_DP_SHIFT;
desc->dtc = len >> jzchan->transfer_shift;
return 0;
}
static struct dma_async_tx_descriptor *jz4780_dma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long flags,
void *context)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
struct jz4780_dma_desc *desc;
unsigned int i;
int err;
desc = jz4780_dma_desc_alloc(jzchan, sg_len, DMA_SLAVE, direction);
if (!desc)
return NULL;
for (i = 0; i < sg_len; i++) {
err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i],
sg_dma_address(&sgl[i]),
sg_dma_len(&sgl[i]),
direction);
if (err < 0) {
jz4780_dma_desc_free(&jzchan->desc->vdesc);
return NULL;
}
desc->desc[i].dcm |= JZ_DMA_DCM_TIE;
if (i != (sg_len - 1) &&
!(jzdma->soc_data->flags & JZ_SOC_DATA_BREAK_LINKS)) {
/* Automatically proceed to the next descriptor. */
desc->desc[i].dcm |= JZ_DMA_DCM_LINK;
/*
* The upper 8 bits of the DTC field in the descriptor
* must be set to (offset from descriptor base of next
* descriptor >> 4).
*/
desc->desc[i].dtc |=
(((i + 1) * sizeof(*desc->desc)) >> 4) << 24;
}
}
return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags);
}
static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
struct jz4780_dma_desc *desc;
unsigned int periods, i;
int err;
if (buf_len % period_len)
return NULL;
periods = buf_len / period_len;
desc = jz4780_dma_desc_alloc(jzchan, periods, DMA_CYCLIC, direction);
if (!desc)
return NULL;
for (i = 0; i < periods; i++) {
err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i], buf_addr,
period_len, direction);
if (err < 0) {
jz4780_dma_desc_free(&jzchan->desc->vdesc);
return NULL;
}
buf_addr += period_len;
/*
* Set the link bit to indicate that the controller should
* automatically proceed to the next descriptor. In
* jz4780_dma_begin(), this will be cleared if we need to issue
* an interrupt after each period.
*/
desc->desc[i].dcm |= JZ_DMA_DCM_TIE | JZ_DMA_DCM_LINK;
/*
* The upper 8 bits of the DTC field in the descriptor must be
* set to (offset from descriptor base of next descriptor >> 4).
* If this is the last descriptor, link it back to the first,
* i.e. leave offset set to 0, otherwise point to the next one.
*/
if (i != (periods - 1)) {
desc->desc[i].dtc |=
(((i + 1) * sizeof(*desc->desc)) >> 4) << 24;
}
}
return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags);
}
static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
struct jz4780_dma_desc *desc;
u32 tsz;
desc = jz4780_dma_desc_alloc(jzchan, 1, DMA_MEMCPY, 0);
if (!desc)
return NULL;
tsz = jz4780_dma_transfer_size(jzchan, dest | src | len,
&jzchan->transfer_shift);
desc->transfer_type = JZ_DMA_DRT_AUTO;
desc->desc[0].dsa = src;
desc->desc[0].dta = dest;
desc->desc[0].dcm = JZ_DMA_DCM_TIE | JZ_DMA_DCM_SAI | JZ_DMA_DCM_DAI |
tsz << JZ_DMA_DCM_TSZ_SHIFT |
JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_SP_SHIFT |
JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_DP_SHIFT;
desc->desc[0].dtc = len >> jzchan->transfer_shift;
return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags);
}
static void jz4780_dma_begin(struct jz4780_dma_chan *jzchan)
{
struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
struct virt_dma_desc *vdesc;
unsigned int i;
dma_addr_t desc_phys;
if (!jzchan->desc) {
vdesc = vchan_next_desc(&jzchan->vchan);
if (!vdesc)
return;
list_del(&vdesc->node);
jzchan->desc = to_jz4780_dma_desc(vdesc);
jzchan->curr_hwdesc = 0;
if (jzchan->desc->type == DMA_CYCLIC && vdesc->tx.callback) {
/*
* The DMA controller doesn't support triggering an
* interrupt after processing each descriptor, only
* after processing an entire terminated list of
* descriptors. For a cyclic DMA setup the list of
* descriptors is not terminated so we can never get an
* interrupt.
*
* If the user requested a callback for a cyclic DMA
* setup then we workaround this hardware limitation
* here by degrading to a set of unlinked descriptors
* which we will submit in sequence in response to the
* completion of processing the previous descriptor.
*/
for (i = 0; i < jzchan->desc->count; i++)
jzchan->desc->desc[i].dcm &= ~JZ_DMA_DCM_LINK;
}
} else {
/*
* There is an existing transfer, therefore this must be one
* for which we unlinked the descriptors above. Advance to the
* next one in the list.
*/
jzchan->curr_hwdesc =
(jzchan->curr_hwdesc + 1) % jzchan->desc->count;
}
/* Enable the channel's clock. */
jz4780_dma_chan_enable(jzdma, jzchan->id);
/* Use 4-word descriptors. */
jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
/* Set transfer type. */
jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DRT,
jzchan->desc->transfer_type);
/*
* Set the transfer count. This is redundant for a descriptor-driven
* transfer. However, there can be a delay between the transfer start
* time and when DTCn reg contains the new transfer count. Setting
* it explicitly ensures residue is computed correctly at all times.
*/
jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DTC,
jzchan->desc->desc[jzchan->curr_hwdesc].dtc);
/* Write descriptor address and initiate descriptor fetch. */
desc_phys = jzchan->desc->desc_phys +
(jzchan->curr_hwdesc * sizeof(*jzchan->desc->desc));
jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DDA, desc_phys);
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DDRS, BIT(jzchan->id));
/* Enable the channel. */
jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS,
JZ_DMA_DCS_CTE);
}
static void jz4780_dma_issue_pending(struct dma_chan *chan)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&jzchan->vchan.lock, flags);
if (vchan_issue_pending(&jzchan->vchan) && !jzchan->desc)
jz4780_dma_begin(jzchan);
spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
}
static int jz4780_dma_terminate_all(struct dma_chan *chan)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&jzchan->vchan.lock, flags);
/* Clear the DMA status and stop the transfer. */
jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
if (jzchan->desc) {
vchan_terminate_vdesc(&jzchan->desc->vdesc);
jzchan->desc = NULL;
}
jz4780_dma_chan_disable(jzdma, jzchan->id);
vchan_get_all_descriptors(&jzchan->vchan, &head);
spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
vchan_dma_desc_free_list(&jzchan->vchan, &head);
return 0;
}
static void jz4780_dma_synchronize(struct dma_chan *chan)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
vchan_synchronize(&jzchan->vchan);
jz4780_dma_chan_disable(jzdma, jzchan->id);
}
static int jz4780_dma_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
if ((config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
|| (config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES))
return -EINVAL;
/* Copy the reset of the slave configuration, it is used later. */
memcpy(&jzchan->config, config, sizeof(jzchan->config));
return 0;
}
static size_t jz4780_dma_desc_residue(struct jz4780_dma_chan *jzchan,
struct jz4780_dma_desc *desc, unsigned int next_sg)
{
struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
unsigned int count = 0;
unsigned int i;
for (i = next_sg; i < desc->count; i++)
count += desc->desc[i].dtc & GENMASK(23, 0);
if (next_sg != 0)
count += jz4780_dma_chn_readl(jzdma, jzchan->id,
JZ_DMA_REG_DTC);
return count << jzchan->transfer_shift;
}
static enum dma_status jz4780_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
struct virt_dma_desc *vdesc;
enum dma_status status;
unsigned long flags;
unsigned long residue = 0;
spin_lock_irqsave(&jzchan->vchan.lock, flags);
status = dma_cookie_status(chan, cookie, txstate);
if ((status == DMA_COMPLETE) || (txstate == NULL))
goto out_unlock_irqrestore;
vdesc = vchan_find_desc(&jzchan->vchan, cookie);
if (vdesc) {
/* On the issued list, so hasn't been processed yet */
residue = jz4780_dma_desc_residue(jzchan,
to_jz4780_dma_desc(vdesc), 0);
} else if (cookie == jzchan->desc->vdesc.tx.cookie) {
residue = jz4780_dma_desc_residue(jzchan, jzchan->desc,
jzchan->curr_hwdesc + 1);
}
dma_set_residue(txstate, residue);
if (vdesc && jzchan->desc && vdesc == &jzchan->desc->vdesc
&& jzchan->desc->status & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT))
status = DMA_ERROR;
out_unlock_irqrestore:
spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
return status;
}
static bool jz4780_dma_chan_irq(struct jz4780_dma_dev *jzdma,
struct jz4780_dma_chan *jzchan)
{
const unsigned int soc_flags = jzdma->soc_data->flags;
struct jz4780_dma_desc *desc = jzchan->desc;
u32 dcs;
bool ack = true;
spin_lock(&jzchan->vchan.lock);
dcs = jz4780_dma_chn_readl(jzdma, jzchan->id, JZ_DMA_REG_DCS);
jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
if (dcs & JZ_DMA_DCS_AR) {
dev_warn(&jzchan->vchan.chan.dev->device,
"address error (DCS=0x%x)\n", dcs);
}
if (dcs & JZ_DMA_DCS_HLT) {
dev_warn(&jzchan->vchan.chan.dev->device,
"channel halt (DCS=0x%x)\n", dcs);
}
if (jzchan->desc) {
jzchan->desc->status = dcs;
if ((dcs & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT)) == 0) {
if (jzchan->desc->type == DMA_CYCLIC) {
vchan_cyclic_callback(&jzchan->desc->vdesc);
jz4780_dma_begin(jzchan);
} else if (dcs & JZ_DMA_DCS_TT) {
if (!(soc_flags & JZ_SOC_DATA_BREAK_LINKS) ||
(jzchan->curr_hwdesc + 1 == desc->count)) {
vchan_cookie_complete(&desc->vdesc);
jzchan->desc = NULL;
}
jz4780_dma_begin(jzchan);
} else {
/* False positive - continue the transfer */
ack = false;
jz4780_dma_chn_writel(jzdma, jzchan->id,
JZ_DMA_REG_DCS,
JZ_DMA_DCS_CTE);
}
}
} else {
dev_err(&jzchan->vchan.chan.dev->device,
"channel IRQ with no active transfer\n");
}
spin_unlock(&jzchan->vchan.lock);
return ack;
}
static irqreturn_t jz4780_dma_irq_handler(int irq, void *data)
{
struct jz4780_dma_dev *jzdma = data;
unsigned int nb_channels = jzdma->soc_data->nb_channels;
unsigned long pending;
u32 dmac;
int i;
pending = jz4780_dma_ctrl_readl(jzdma, JZ_DMA_REG_DIRQP);
for_each_set_bit(i, &pending, nb_channels) {
if (jz4780_dma_chan_irq(jzdma, &jzdma->chan[i]))
pending &= ~BIT(i);
}
/* Clear halt and address error status of all channels. */
dmac = jz4780_dma_ctrl_readl(jzdma, JZ_DMA_REG_DMAC);
dmac &= ~(JZ_DMA_DMAC_HLT | JZ_DMA_DMAC_AR);
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMAC, dmac);
/* Clear interrupt pending status. */
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DIRQP, pending);
return IRQ_HANDLED;
}
static int jz4780_dma_alloc_chan_resources(struct dma_chan *chan)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
jzchan->desc_pool = dma_pool_create(dev_name(&chan->dev->device),
chan->device->dev,
JZ_DMA_DESC_BLOCK_SIZE,
PAGE_SIZE, 0);
if (!jzchan->desc_pool) {
dev_err(&chan->dev->device,
"failed to allocate descriptor pool\n");
return -ENOMEM;
}
return 0;
}
static void jz4780_dma_free_chan_resources(struct dma_chan *chan)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
vchan_free_chan_resources(&jzchan->vchan);
dma_pool_destroy(jzchan->desc_pool);
jzchan->desc_pool = NULL;
}
static bool jz4780_dma_filter_fn(struct dma_chan *chan, void *param)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
struct jz4780_dma_filter_data *data = param;
if (data->channel > -1) {
if (data->channel != jzchan->id)
return false;
} else if (jzdma->chan_reserved & BIT(jzchan->id)) {
return false;
}
jzchan->transfer_type_tx = data->transfer_type_tx;
jzchan->transfer_type_rx = data->transfer_type_rx;
return true;
}
static struct dma_chan *jz4780_of_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct jz4780_dma_dev *jzdma = ofdma->of_dma_data;
dma_cap_mask_t mask = jzdma->dma_device.cap_mask;
struct jz4780_dma_filter_data data;
if (dma_spec->args_count == 2) {
data.transfer_type_tx = dma_spec->args[0];
data.transfer_type_rx = dma_spec->args[0];
data.channel = dma_spec->args[1];
} else if (dma_spec->args_count == 3) {
data.transfer_type_tx = dma_spec->args[0];
data.transfer_type_rx = dma_spec->args[1];
data.channel = dma_spec->args[2];
} else {
return NULL;
}
if (data.channel > -1) {
if (data.channel >= jzdma->soc_data->nb_channels) {
dev_err(jzdma->dma_device.dev,
"device requested non-existent channel %u\n",
data.channel);
return NULL;
}
/* Can only select a channel marked as reserved. */
if (!(jzdma->chan_reserved & BIT(data.channel))) {
dev_err(jzdma->dma_device.dev,
"device requested unreserved channel %u\n",
data.channel);
return NULL;
}
jzdma->chan[data.channel].transfer_type_tx = data.transfer_type_tx;
jzdma->chan[data.channel].transfer_type_rx = data.transfer_type_rx;
return dma_get_slave_channel(
&jzdma->chan[data.channel].vchan.chan);
} else {
return __dma_request_channel(&mask, jz4780_dma_filter_fn, &data,
ofdma->of_node);
}
}
static int jz4780_dma_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct jz4780_dma_soc_data *soc_data;
struct jz4780_dma_dev *jzdma;
struct jz4780_dma_chan *jzchan;
struct dma_device *dd;
struct resource *res;
int i, ret;
if (!dev->of_node) {
dev_err(dev, "This driver must be probed from devicetree\n");
return -EINVAL;
}
soc_data = device_get_match_data(dev);
if (!soc_data)
return -EINVAL;
jzdma = devm_kzalloc(dev, struct_size(jzdma, chan,
soc_data->nb_channels), GFP_KERNEL);
if (!jzdma)
return -ENOMEM;
jzdma->soc_data = soc_data;
platform_set_drvdata(pdev, jzdma);
jzdma->chn_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(jzdma->chn_base))
return PTR_ERR(jzdma->chn_base);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (res) {
jzdma->ctrl_base = devm_ioremap_resource(dev, res);
if (IS_ERR(jzdma->ctrl_base))
return PTR_ERR(jzdma->ctrl_base);
} else if (soc_data->flags & JZ_SOC_DATA_ALLOW_LEGACY_DT) {
/*
* On JZ4780, if the second memory resource was not supplied,
* assume we're using an old devicetree, and calculate the
* offset to the control registers.
*/
jzdma->ctrl_base = jzdma->chn_base + JZ4780_DMA_CTRL_OFFSET;
} else {
dev_err(dev, "failed to get I/O memory\n");
return -EINVAL;
}
jzdma->clk = devm_clk_get(dev, NULL);
if (IS_ERR(jzdma->clk)) {
dev_err(dev, "failed to get clock\n");
ret = PTR_ERR(jzdma->clk);
return ret;
}
clk_prepare_enable(jzdma->clk);
/* Property is optional, if it doesn't exist the value will remain 0. */
of_property_read_u32_index(dev->of_node, "ingenic,reserved-channels",
0, &jzdma->chan_reserved);
dd = &jzdma->dma_device;
/*
* The real segment size limit is dependent on the size unit selected
* for the transfer. Because the size unit is selected automatically
* and may be as small as 1 byte, use a safe limit of 2^24-1 bytes to
* ensure the 24-bit transfer count in the descriptor cannot overflow.
*/
dma_set_max_seg_size(dev, 0xffffff);
dma_cap_set(DMA_MEMCPY, dd->cap_mask);
dma_cap_set(DMA_SLAVE, dd->cap_mask);
dma_cap_set(DMA_CYCLIC, dd->cap_mask);
dd->dev = dev;
dd->copy_align = DMAENGINE_ALIGN_4_BYTES;
dd->device_alloc_chan_resources = jz4780_dma_alloc_chan_resources;
dd->device_free_chan_resources = jz4780_dma_free_chan_resources;
dd->device_prep_slave_sg = jz4780_dma_prep_slave_sg;
dd->device_prep_dma_cyclic = jz4780_dma_prep_dma_cyclic;
dd->device_prep_dma_memcpy = jz4780_dma_prep_dma_memcpy;
dd->device_config = jz4780_dma_config;
dd->device_terminate_all = jz4780_dma_terminate_all;
dd->device_synchronize = jz4780_dma_synchronize;
dd->device_tx_status = jz4780_dma_tx_status;
dd->device_issue_pending = jz4780_dma_issue_pending;
dd->src_addr_widths = JZ_DMA_BUSWIDTHS;
dd->dst_addr_widths = JZ_DMA_BUSWIDTHS;
dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
dd->max_sg_burst = JZ_DMA_MAX_DESC;
/*
* Enable DMA controller, mark all channels as not programmable.
* Also set the FMSC bit - it increases MSC performance, so it makes
* little sense not to enable it.
*/
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMAC, JZ_DMA_DMAC_DMAE |
JZ_DMA_DMAC_FAIC | JZ_DMA_DMAC_FMSC);
if (soc_data->flags & JZ_SOC_DATA_PROGRAMMABLE_DMA)
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMACP, 0);
INIT_LIST_HEAD(&dd->channels);
for (i = 0; i < soc_data->nb_channels; i++) {
jzchan = &jzdma->chan[i];
jzchan->id = i;
vchan_init(&jzchan->vchan, dd);
jzchan->vchan.desc_free = jz4780_dma_desc_free;
}
/*
* On JZ4760, chan0 won't enable properly the first time.
* Enabling then disabling chan1 will magically make chan0 work
* correctly.
*/
jz4780_dma_chan_enable(jzdma, 1);
jz4780_dma_chan_disable(jzdma, 1);
ret = platform_get_irq(pdev, 0);
if (ret < 0)
goto err_disable_clk;
jzdma->irq = ret;
ret = request_irq(jzdma->irq, jz4780_dma_irq_handler, 0, dev_name(dev),
jzdma);
if (ret) {
dev_err(dev, "failed to request IRQ %u!\n", jzdma->irq);
goto err_disable_clk;
}
ret = dmaenginem_async_device_register(dd);
if (ret) {
dev_err(dev, "failed to register device\n");
goto err_free_irq;
}
/* Register with OF DMA helpers. */
ret = of_dma_controller_register(dev->of_node, jz4780_of_dma_xlate,
jzdma);
if (ret) {
dev_err(dev, "failed to register OF DMA controller\n");
goto err_free_irq;
}
dev_info(dev, "JZ4780 DMA controller initialised\n");
return 0;
err_free_irq:
free_irq(jzdma->irq, jzdma);
err_disable_clk:
clk_disable_unprepare(jzdma->clk);
return ret;
}
static int jz4780_dma_remove(struct platform_device *pdev)
{
struct jz4780_dma_dev *jzdma = platform_get_drvdata(pdev);
int i;
of_dma_controller_free(pdev->dev.of_node);
clk_disable_unprepare(jzdma->clk);
free_irq(jzdma->irq, jzdma);
for (i = 0; i < jzdma->soc_data->nb_channels; i++)
tasklet_kill(&jzdma->chan[i].vchan.task);
return 0;
}
static const struct jz4780_dma_soc_data jz4740_dma_soc_data = {
.nb_channels = 6,
.transfer_ord_max = 5,
.flags = JZ_SOC_DATA_BREAK_LINKS,
};
static const struct jz4780_dma_soc_data jz4725b_dma_soc_data = {
.nb_channels = 6,
.transfer_ord_max = 5,
.flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC |
JZ_SOC_DATA_BREAK_LINKS,
};
static const struct jz4780_dma_soc_data jz4755_dma_soc_data = {
.nb_channels = 4,
.transfer_ord_max = 5,
.flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC |
JZ_SOC_DATA_BREAK_LINKS,
};
static const struct jz4780_dma_soc_data jz4760_dma_soc_data = {
.nb_channels = 5,
.transfer_ord_max = 6,
.flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC,
};
static const struct jz4780_dma_soc_data jz4760_mdma_soc_data = {
.nb_channels = 2,
.transfer_ord_max = 6,
.flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC,
};
static const struct jz4780_dma_soc_data jz4760_bdma_soc_data = {
.nb_channels = 3,
.transfer_ord_max = 6,
.flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC,
};
static const struct jz4780_dma_soc_data jz4760b_dma_soc_data = {
.nb_channels = 5,
.transfer_ord_max = 6,
.flags = JZ_SOC_DATA_PER_CHAN_PM,
};
static const struct jz4780_dma_soc_data jz4760b_mdma_soc_data = {
.nb_channels = 2,
.transfer_ord_max = 6,
.flags = JZ_SOC_DATA_PER_CHAN_PM,
};
static const struct jz4780_dma_soc_data jz4760b_bdma_soc_data = {
.nb_channels = 3,
.transfer_ord_max = 6,
.flags = JZ_SOC_DATA_PER_CHAN_PM,
};
static const struct jz4780_dma_soc_data jz4770_dma_soc_data = {
.nb_channels = 6,
.transfer_ord_max = 6,
.flags = JZ_SOC_DATA_PER_CHAN_PM,
};
static const struct jz4780_dma_soc_data jz4780_dma_soc_data = {
.nb_channels = 32,
.transfer_ord_max = 7,
.flags = JZ_SOC_DATA_ALLOW_LEGACY_DT | JZ_SOC_DATA_PROGRAMMABLE_DMA,
};
static const struct jz4780_dma_soc_data x1000_dma_soc_data = {
.nb_channels = 8,
.transfer_ord_max = 7,
.flags = JZ_SOC_DATA_PROGRAMMABLE_DMA,
};
static const struct jz4780_dma_soc_data x1830_dma_soc_data = {
.nb_channels = 32,
.transfer_ord_max = 7,
.flags = JZ_SOC_DATA_PROGRAMMABLE_DMA,
};
static const struct of_device_id jz4780_dma_dt_match[] = {
{ .compatible = "ingenic,jz4740-dma", .data = &jz4740_dma_soc_data },
{ .compatible = "ingenic,jz4725b-dma", .data = &jz4725b_dma_soc_data },
{ .compatible = "ingenic,jz4755-dma", .data = &jz4755_dma_soc_data },
{ .compatible = "ingenic,jz4760-dma", .data = &jz4760_dma_soc_data },
{ .compatible = "ingenic,jz4760-mdma", .data = &jz4760_mdma_soc_data },
{ .compatible = "ingenic,jz4760-bdma", .data = &jz4760_bdma_soc_data },
{ .compatible = "ingenic,jz4760b-dma", .data = &jz4760b_dma_soc_data },
{ .compatible = "ingenic,jz4760b-mdma", .data = &jz4760b_mdma_soc_data },
{ .compatible = "ingenic,jz4760b-bdma", .data = &jz4760b_bdma_soc_data },
{ .compatible = "ingenic,jz4770-dma", .data = &jz4770_dma_soc_data },
{ .compatible = "ingenic,jz4780-dma", .data = &jz4780_dma_soc_data },
{ .compatible = "ingenic,x1000-dma", .data = &x1000_dma_soc_data },
{ .compatible = "ingenic,x1830-dma", .data = &x1830_dma_soc_data },
{},
};
MODULE_DEVICE_TABLE(of, jz4780_dma_dt_match);
static struct platform_driver jz4780_dma_driver = {
.probe = jz4780_dma_probe,
.remove = jz4780_dma_remove,
.driver = {
.name = "jz4780-dma",
.of_match_table = jz4780_dma_dt_match,
},
};
static int __init jz4780_dma_init(void)
{
return platform_driver_register(&jz4780_dma_driver);
}
subsys_initcall(jz4780_dma_init);
static void __exit jz4780_dma_exit(void)
{
platform_driver_unregister(&jz4780_dma_driver);
}
module_exit(jz4780_dma_exit);
MODULE_AUTHOR("Alex Smith <[email protected]>");
MODULE_DESCRIPTION("Ingenic JZ4780 DMA controller driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/dma-jz4780.c |
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 Socionext Inc.
// Author: Masahiro Yamada <[email protected]>
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "virt-dma.h"
/* registers common for all channels */
#define UNIPHIER_MDMAC_CMD 0x000 /* issue DMA start/abort */
#define UNIPHIER_MDMAC_CMD_ABORT BIT(31) /* 1: abort, 0: start */
/* per-channel registers */
#define UNIPHIER_MDMAC_CH_OFFSET 0x100
#define UNIPHIER_MDMAC_CH_STRIDE 0x040
#define UNIPHIER_MDMAC_CH_IRQ_STAT 0x010 /* current hw status (RO) */
#define UNIPHIER_MDMAC_CH_IRQ_REQ 0x014 /* latched STAT (WOC) */
#define UNIPHIER_MDMAC_CH_IRQ_EN 0x018 /* IRQ enable mask */
#define UNIPHIER_MDMAC_CH_IRQ_DET 0x01c /* REQ & EN (RO) */
#define UNIPHIER_MDMAC_CH_IRQ__ABORT BIT(13)
#define UNIPHIER_MDMAC_CH_IRQ__DONE BIT(1)
#define UNIPHIER_MDMAC_CH_SRC_MODE 0x020 /* mode of source */
#define UNIPHIER_MDMAC_CH_DEST_MODE 0x024 /* mode of destination */
#define UNIPHIER_MDMAC_CH_MODE__ADDR_INC (0 << 4)
#define UNIPHIER_MDMAC_CH_MODE__ADDR_DEC (1 << 4)
#define UNIPHIER_MDMAC_CH_MODE__ADDR_FIXED (2 << 4)
#define UNIPHIER_MDMAC_CH_SRC_ADDR 0x028 /* source address */
#define UNIPHIER_MDMAC_CH_DEST_ADDR 0x02c /* destination address */
#define UNIPHIER_MDMAC_CH_SIZE 0x030 /* transfer bytes */
#define UNIPHIER_MDMAC_SLAVE_BUSWIDTHS \
(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
struct uniphier_mdmac_desc {
struct virt_dma_desc vd;
struct scatterlist *sgl;
unsigned int sg_len;
unsigned int sg_cur;
enum dma_transfer_direction dir;
};
struct uniphier_mdmac_chan {
struct virt_dma_chan vc;
struct uniphier_mdmac_device *mdev;
struct uniphier_mdmac_desc *md;
void __iomem *reg_ch_base;
unsigned int chan_id;
};
struct uniphier_mdmac_device {
struct dma_device ddev;
struct clk *clk;
void __iomem *reg_base;
struct uniphier_mdmac_chan channels[];
};
static struct uniphier_mdmac_chan *
to_uniphier_mdmac_chan(struct virt_dma_chan *vc)
{
return container_of(vc, struct uniphier_mdmac_chan, vc);
}
static struct uniphier_mdmac_desc *
to_uniphier_mdmac_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct uniphier_mdmac_desc, vd);
}
/* mc->vc.lock must be held by caller */
static struct uniphier_mdmac_desc *
uniphier_mdmac_next_desc(struct uniphier_mdmac_chan *mc)
{
struct virt_dma_desc *vd;
vd = vchan_next_desc(&mc->vc);
if (!vd) {
mc->md = NULL;
return NULL;
}
list_del(&vd->node);
mc->md = to_uniphier_mdmac_desc(vd);
return mc->md;
}
/* mc->vc.lock must be held by caller */
static void uniphier_mdmac_handle(struct uniphier_mdmac_chan *mc,
struct uniphier_mdmac_desc *md)
{
struct uniphier_mdmac_device *mdev = mc->mdev;
struct scatterlist *sg;
u32 irq_flag = UNIPHIER_MDMAC_CH_IRQ__DONE;
u32 src_mode, src_addr, dest_mode, dest_addr, chunk_size;
sg = &md->sgl[md->sg_cur];
if (md->dir == DMA_MEM_TO_DEV) {
src_mode = UNIPHIER_MDMAC_CH_MODE__ADDR_INC;
src_addr = sg_dma_address(sg);
dest_mode = UNIPHIER_MDMAC_CH_MODE__ADDR_FIXED;
dest_addr = 0;
} else {
src_mode = UNIPHIER_MDMAC_CH_MODE__ADDR_FIXED;
src_addr = 0;
dest_mode = UNIPHIER_MDMAC_CH_MODE__ADDR_INC;
dest_addr = sg_dma_address(sg);
}
chunk_size = sg_dma_len(sg);
writel(src_mode, mc->reg_ch_base + UNIPHIER_MDMAC_CH_SRC_MODE);
writel(dest_mode, mc->reg_ch_base + UNIPHIER_MDMAC_CH_DEST_MODE);
writel(src_addr, mc->reg_ch_base + UNIPHIER_MDMAC_CH_SRC_ADDR);
writel(dest_addr, mc->reg_ch_base + UNIPHIER_MDMAC_CH_DEST_ADDR);
writel(chunk_size, mc->reg_ch_base + UNIPHIER_MDMAC_CH_SIZE);
/* write 1 to clear */
writel(irq_flag, mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_REQ);
writel(irq_flag, mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_EN);
writel(BIT(mc->chan_id), mdev->reg_base + UNIPHIER_MDMAC_CMD);
}
/* mc->vc.lock must be held by caller */
static void uniphier_mdmac_start(struct uniphier_mdmac_chan *mc)
{
struct uniphier_mdmac_desc *md;
md = uniphier_mdmac_next_desc(mc);
if (md)
uniphier_mdmac_handle(mc, md);
}
/* mc->vc.lock must be held by caller */
static int uniphier_mdmac_abort(struct uniphier_mdmac_chan *mc)
{
struct uniphier_mdmac_device *mdev = mc->mdev;
u32 irq_flag = UNIPHIER_MDMAC_CH_IRQ__ABORT;
u32 val;
/* write 1 to clear */
writel(irq_flag, mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_REQ);
writel(UNIPHIER_MDMAC_CMD_ABORT | BIT(mc->chan_id),
mdev->reg_base + UNIPHIER_MDMAC_CMD);
/*
* Abort should be accepted soon. We poll the bit here instead of
* waiting for the interrupt.
*/
return readl_poll_timeout(mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_REQ,
val, val & irq_flag, 0, 20);
}
static irqreturn_t uniphier_mdmac_interrupt(int irq, void *dev_id)
{
struct uniphier_mdmac_chan *mc = dev_id;
struct uniphier_mdmac_desc *md;
irqreturn_t ret = IRQ_HANDLED;
u32 irq_stat;
spin_lock(&mc->vc.lock);
irq_stat = readl(mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_DET);
/*
* Some channels share a single interrupt line. If the IRQ status is 0,
* this is probably triggered by a different channel.
*/
if (!irq_stat) {
ret = IRQ_NONE;
goto out;
}
/* write 1 to clear */
writel(irq_stat, mc->reg_ch_base + UNIPHIER_MDMAC_CH_IRQ_REQ);
/*
* UNIPHIER_MDMAC_CH_IRQ__DONE interrupt is asserted even when the DMA
* is aborted. To distinguish the normal completion and the abort,
* check mc->md. If it is NULL, we are aborting.
*/
md = mc->md;
if (!md)
goto out;
md->sg_cur++;
if (md->sg_cur >= md->sg_len) {
vchan_cookie_complete(&md->vd);
md = uniphier_mdmac_next_desc(mc);
if (!md)
goto out;
}
uniphier_mdmac_handle(mc, md);
out:
spin_unlock(&mc->vc.lock);
return ret;
}
static void uniphier_mdmac_free_chan_resources(struct dma_chan *chan)
{
vchan_free_chan_resources(to_virt_chan(chan));
}
static struct dma_async_tx_descriptor *
uniphier_mdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct uniphier_mdmac_desc *md;
if (!is_slave_direction(direction))
return NULL;
md = kzalloc(sizeof(*md), GFP_NOWAIT);
if (!md)
return NULL;
md->sgl = sgl;
md->sg_len = sg_len;
md->dir = direction;
return vchan_tx_prep(vc, &md->vd, flags);
}
static int uniphier_mdmac_terminate_all(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct uniphier_mdmac_chan *mc = to_uniphier_mdmac_chan(vc);
unsigned long flags;
int ret = 0;
LIST_HEAD(head);
spin_lock_irqsave(&vc->lock, flags);
if (mc->md) {
vchan_terminate_vdesc(&mc->md->vd);
mc->md = NULL;
ret = uniphier_mdmac_abort(mc);
}
vchan_get_all_descriptors(vc, &head);
spin_unlock_irqrestore(&vc->lock, flags);
vchan_dma_desc_free_list(vc, &head);
return ret;
}
static void uniphier_mdmac_synchronize(struct dma_chan *chan)
{
vchan_synchronize(to_virt_chan(chan));
}
static enum dma_status uniphier_mdmac_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct virt_dma_chan *vc;
struct virt_dma_desc *vd;
struct uniphier_mdmac_chan *mc;
struct uniphier_mdmac_desc *md = NULL;
enum dma_status stat;
unsigned long flags;
int i;
stat = dma_cookie_status(chan, cookie, txstate);
/* Return immediately if we do not need to compute the residue. */
if (stat == DMA_COMPLETE || !txstate)
return stat;
vc = to_virt_chan(chan);
spin_lock_irqsave(&vc->lock, flags);
mc = to_uniphier_mdmac_chan(vc);
if (mc->md && mc->md->vd.tx.cookie == cookie) {
/* residue from the on-flight chunk */
txstate->residue = readl(mc->reg_ch_base +
UNIPHIER_MDMAC_CH_SIZE);
md = mc->md;
}
if (!md) {
vd = vchan_find_desc(vc, cookie);
if (vd)
md = to_uniphier_mdmac_desc(vd);
}
if (md) {
/* residue from the queued chunks */
for (i = md->sg_cur; i < md->sg_len; i++)
txstate->residue += sg_dma_len(&md->sgl[i]);
}
spin_unlock_irqrestore(&vc->lock, flags);
return stat;
}
static void uniphier_mdmac_issue_pending(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct uniphier_mdmac_chan *mc = to_uniphier_mdmac_chan(vc);
unsigned long flags;
spin_lock_irqsave(&vc->lock, flags);
if (vchan_issue_pending(vc) && !mc->md)
uniphier_mdmac_start(mc);
spin_unlock_irqrestore(&vc->lock, flags);
}
static void uniphier_mdmac_desc_free(struct virt_dma_desc *vd)
{
kfree(to_uniphier_mdmac_desc(vd));
}
static int uniphier_mdmac_chan_init(struct platform_device *pdev,
struct uniphier_mdmac_device *mdev,
int chan_id)
{
struct device *dev = &pdev->dev;
struct uniphier_mdmac_chan *mc = &mdev->channels[chan_id];
char *irq_name;
int irq, ret;
irq = platform_get_irq(pdev, chan_id);
if (irq < 0)
return irq;
irq_name = devm_kasprintf(dev, GFP_KERNEL, "uniphier-mio-dmac-ch%d",
chan_id);
if (!irq_name)
return -ENOMEM;
ret = devm_request_irq(dev, irq, uniphier_mdmac_interrupt,
IRQF_SHARED, irq_name, mc);
if (ret)
return ret;
mc->mdev = mdev;
mc->reg_ch_base = mdev->reg_base + UNIPHIER_MDMAC_CH_OFFSET +
UNIPHIER_MDMAC_CH_STRIDE * chan_id;
mc->chan_id = chan_id;
mc->vc.desc_free = uniphier_mdmac_desc_free;
vchan_init(&mc->vc, &mdev->ddev);
return 0;
}
static int uniphier_mdmac_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct uniphier_mdmac_device *mdev;
struct dma_device *ddev;
int nr_chans, ret, i;
nr_chans = platform_irq_count(pdev);
if (nr_chans < 0)
return nr_chans;
ret = dma_set_mask(dev, DMA_BIT_MASK(32));
if (ret)
return ret;
mdev = devm_kzalloc(dev, struct_size(mdev, channels, nr_chans),
GFP_KERNEL);
if (!mdev)
return -ENOMEM;
mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mdev->reg_base))
return PTR_ERR(mdev->reg_base);
mdev->clk = devm_clk_get(dev, NULL);
if (IS_ERR(mdev->clk)) {
dev_err(dev, "failed to get clock\n");
return PTR_ERR(mdev->clk);
}
ret = clk_prepare_enable(mdev->clk);
if (ret)
return ret;
ddev = &mdev->ddev;
ddev->dev = dev;
dma_cap_set(DMA_PRIVATE, ddev->cap_mask);
ddev->src_addr_widths = UNIPHIER_MDMAC_SLAVE_BUSWIDTHS;
ddev->dst_addr_widths = UNIPHIER_MDMAC_SLAVE_BUSWIDTHS;
ddev->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
ddev->device_free_chan_resources = uniphier_mdmac_free_chan_resources;
ddev->device_prep_slave_sg = uniphier_mdmac_prep_slave_sg;
ddev->device_terminate_all = uniphier_mdmac_terminate_all;
ddev->device_synchronize = uniphier_mdmac_synchronize;
ddev->device_tx_status = uniphier_mdmac_tx_status;
ddev->device_issue_pending = uniphier_mdmac_issue_pending;
INIT_LIST_HEAD(&ddev->channels);
for (i = 0; i < nr_chans; i++) {
ret = uniphier_mdmac_chan_init(pdev, mdev, i);
if (ret)
goto disable_clk;
}
ret = dma_async_device_register(ddev);
if (ret)
goto disable_clk;
ret = of_dma_controller_register(dev->of_node, of_dma_xlate_by_chan_id,
ddev);
if (ret)
goto unregister_dmac;
platform_set_drvdata(pdev, mdev);
return 0;
unregister_dmac:
dma_async_device_unregister(ddev);
disable_clk:
clk_disable_unprepare(mdev->clk);
return ret;
}
static int uniphier_mdmac_remove(struct platform_device *pdev)
{
struct uniphier_mdmac_device *mdev = platform_get_drvdata(pdev);
struct dma_chan *chan;
int ret;
/*
* Before reaching here, almost all descriptors have been freed by the
* ->device_free_chan_resources() hook. However, each channel might
* be still holding one descriptor that was on-flight at that moment.
* Terminate it to make sure this hardware is no longer running. Then,
* free the channel resources once again to avoid memory leak.
*/
list_for_each_entry(chan, &mdev->ddev.channels, device_node) {
ret = dmaengine_terminate_sync(chan);
if (ret)
return ret;
uniphier_mdmac_free_chan_resources(chan);
}
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&mdev->ddev);
clk_disable_unprepare(mdev->clk);
return 0;
}
static const struct of_device_id uniphier_mdmac_match[] = {
{ .compatible = "socionext,uniphier-mio-dmac" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, uniphier_mdmac_match);
static struct platform_driver uniphier_mdmac_driver = {
.probe = uniphier_mdmac_probe,
.remove = uniphier_mdmac_remove,
.driver = {
.name = "uniphier-mio-dmac",
.of_match_table = uniphier_mdmac_match,
},
};
module_platform_driver(uniphier_mdmac_driver);
MODULE_AUTHOR("Masahiro Yamada <[email protected]>");
MODULE_DESCRIPTION("UniPhier MIO DMAC driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/uniphier-mdmac.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2006 ARM Ltd.
* Copyright (c) 2010 ST-Ericsson SA
* Copyirght (c) 2017 Linaro Ltd.
*
* Author: Peter Pearse <[email protected]>
* Author: Linus Walleij <[email protected]>
*
* Documentation: ARM DDI 0196G == PL080
* Documentation: ARM DDI 0218E == PL081
* Documentation: S3C6410 User's Manual == PL080S
*
* PL080 & PL081 both have 16 sets of DMA signals that can be routed to any
* channel.
*
* The PL080 has 8 channels available for simultaneous use, and the PL081
* has only two channels. So on these DMA controllers the number of channels
* and the number of incoming DMA signals are two totally different things.
* It is usually not possible to theoretically handle all physical signals,
* so a multiplexing scheme with possible denial of use is necessary.
*
* The PL080 has a dual bus master, PL081 has a single master.
*
* PL080S is a version modified by Samsung and used in S3C64xx SoCs.
* It differs in following aspects:
* - CH_CONFIG register at different offset,
* - separate CH_CONTROL2 register for transfer size,
* - bigger maximum transfer size,
* - 8-word aligned LLI, instead of 4-word, due to extra CCTL2 word,
* - no support for peripheral flow control.
*
* Memory to peripheral transfer may be visualized as
* Get data from memory to DMAC
* Until no data left
* On burst request from peripheral
* Destination burst from DMAC to peripheral
* Clear burst request
* Raise terminal count interrupt
*
* For peripherals with a FIFO:
* Source burst size == half the depth of the peripheral FIFO
* Destination burst size == the depth of the peripheral FIFO
*
* (Bursts are irrelevant for mem to mem transfers - there are no burst
* signals, the DMA controller will simply facilitate its AHB master.)
*
* ASSUMES default (little) endianness for DMA transfers
*
* The PL08x has two flow control settings:
* - DMAC flow control: the transfer size defines the number of transfers
* which occur for the current LLI entry, and the DMAC raises TC at the
* end of every LLI entry. Observed behaviour shows the DMAC listening
* to both the BREQ and SREQ signals (contrary to documented),
* transferring data if either is active. The LBREQ and LSREQ signals
* are ignored.
*
* - Peripheral flow control: the transfer size is ignored (and should be
* zero). The data is transferred from the current LLI entry, until
* after the final transfer signalled by LBREQ or LSREQ. The DMAC
* will then move to the next LLI entry. Unsupported by PL080S.
*/
#include <linux/amba/bus.h>
#include <linux/amba/pl08x.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/pm_runtime.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/amba/pl080.h>
#include "dmaengine.h"
#include "virt-dma.h"
#define DRIVER_NAME "pl08xdmac"
#define PL80X_DMA_BUSWIDTHS \
BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)
static struct amba_driver pl08x_amba_driver;
struct pl08x_driver_data;
/**
* struct vendor_data - vendor-specific config parameters for PL08x derivatives
* @config_offset: offset to the configuration register
* @channels: the number of channels available in this variant
* @signals: the number of request signals available from the hardware
* @dualmaster: whether this version supports dual AHB masters or not.
* @nomadik: whether this variant is a ST Microelectronics Nomadik, where the
* channels have Nomadik security extension bits that need to be checked
* for permission before use and some registers are missing
* @pl080s: whether this variant is a Samsung PL080S, which has separate
* register and LLI word for transfer size.
* @ftdmac020: whether this variant is a Faraday Technology FTDMAC020
* @max_transfer_size: the maximum single element transfer size for this
* PL08x variant.
*/
struct vendor_data {
u8 config_offset;
u8 channels;
u8 signals;
bool dualmaster;
bool nomadik;
bool pl080s;
bool ftdmac020;
u32 max_transfer_size;
};
/**
* struct pl08x_bus_data - information of source or destination
* busses for a transfer
* @addr: current address
* @maxwidth: the maximum width of a transfer on this bus
* @buswidth: the width of this bus in bytes: 1, 2 or 4
*/
struct pl08x_bus_data {
dma_addr_t addr;
u8 maxwidth;
u8 buswidth;
};
#define IS_BUS_ALIGNED(bus) IS_ALIGNED((bus)->addr, (bus)->buswidth)
/**
* struct pl08x_phy_chan - holder for the physical channels
* @id: physical index to this channel
* @base: memory base address for this physical channel
* @reg_config: configuration address for this physical channel
* @reg_control: control address for this physical channel
* @reg_src: transfer source address register
* @reg_dst: transfer destination address register
* @reg_lli: transfer LLI address register
* @reg_busy: if the variant has a special per-channel busy register,
* this contains a pointer to it
* @lock: a lock to use when altering an instance of this struct
* @serving: the virtual channel currently being served by this physical
* channel
* @locked: channel unavailable for the system, e.g. dedicated to secure
* world
* @ftdmac020: channel is on a FTDMAC020
* @pl080s: channel is on a PL08s
*/
struct pl08x_phy_chan {
unsigned int id;
void __iomem *base;
void __iomem *reg_config;
void __iomem *reg_control;
void __iomem *reg_src;
void __iomem *reg_dst;
void __iomem *reg_lli;
void __iomem *reg_busy;
spinlock_t lock;
struct pl08x_dma_chan *serving;
bool locked;
bool ftdmac020;
bool pl080s;
};
/**
* struct pl08x_sg - structure containing data per sg
* @src_addr: src address of sg
* @dst_addr: dst address of sg
* @len: transfer len in bytes
* @node: node for txd's dsg_list
*/
struct pl08x_sg {
dma_addr_t src_addr;
dma_addr_t dst_addr;
size_t len;
struct list_head node;
};
/**
* struct pl08x_txd - wrapper for struct dma_async_tx_descriptor
* @vd: virtual DMA descriptor
* @dsg_list: list of children sg's
* @llis_bus: DMA memory address (physical) start for the LLIs
* @llis_va: virtual memory address start for the LLIs
* @cctl: control reg values for current txd
* @ccfg: config reg values for current txd
* @done: this marks completed descriptors, which should not have their
* mux released.
* @cyclic: indicate cyclic transfers
*/
struct pl08x_txd {
struct virt_dma_desc vd;
struct list_head dsg_list;
dma_addr_t llis_bus;
u32 *llis_va;
/* Default cctl value for LLIs */
u32 cctl;
/*
* Settings to be put into the physical channel when we
* trigger this txd. Other registers are in llis_va[0].
*/
u32 ccfg;
bool done;
bool cyclic;
};
/**
* enum pl08x_dma_chan_state - holds the PL08x specific virtual channel
* states
* @PL08X_CHAN_IDLE: the channel is idle
* @PL08X_CHAN_RUNNING: the channel has allocated a physical transport
* channel and is running a transfer on it
* @PL08X_CHAN_PAUSED: the channel has allocated a physical transport
* channel, but the transfer is currently paused
* @PL08X_CHAN_WAITING: the channel is waiting for a physical transport
* channel to become available (only pertains to memcpy channels)
*/
enum pl08x_dma_chan_state {
PL08X_CHAN_IDLE,
PL08X_CHAN_RUNNING,
PL08X_CHAN_PAUSED,
PL08X_CHAN_WAITING,
};
/**
* struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel
* @vc: wrapped virtual channel
* @phychan: the physical channel utilized by this channel, if there is one
* @name: name of channel
* @cd: channel platform data
* @cfg: slave configuration
* @at: active transaction on this channel
* @host: a pointer to the host (internal use)
* @state: whether the channel is idle, paused, running etc
* @slave: whether this channel is a device (slave) or for memcpy
* @signal: the physical DMA request signal which this channel is using
* @mux_use: count of descriptors using this DMA request signal setting
* @waiting_at: time in jiffies when this channel moved to waiting state
*/
struct pl08x_dma_chan {
struct virt_dma_chan vc;
struct pl08x_phy_chan *phychan;
const char *name;
struct pl08x_channel_data *cd;
struct dma_slave_config cfg;
struct pl08x_txd *at;
struct pl08x_driver_data *host;
enum pl08x_dma_chan_state state;
bool slave;
int signal;
unsigned mux_use;
unsigned long waiting_at;
};
/**
* struct pl08x_driver_data - the local state holder for the PL08x
* @slave: optional slave engine for this instance
* @memcpy: memcpy engine for this instance
* @has_slave: the PL08x has a slave engine (routed signals)
* @base: virtual memory base (remapped) for the PL08x
* @adev: the corresponding AMBA (PrimeCell) bus entry
* @vd: vendor data for this PL08x variant
* @pd: platform data passed in from the platform/machine
* @phy_chans: array of data for the physical channels
* @pool: a pool for the LLI descriptors
* @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI
* fetches
* @mem_buses: set to indicate memory transfers on AHB2.
* @lli_words: how many words are used in each LLI item for this variant
*/
struct pl08x_driver_data {
struct dma_device slave;
struct dma_device memcpy;
bool has_slave;
void __iomem *base;
struct amba_device *adev;
const struct vendor_data *vd;
struct pl08x_platform_data *pd;
struct pl08x_phy_chan *phy_chans;
struct dma_pool *pool;
u8 lli_buses;
u8 mem_buses;
u8 lli_words;
};
/*
* PL08X specific defines
*/
/* The order of words in an LLI. */
#define PL080_LLI_SRC 0
#define PL080_LLI_DST 1
#define PL080_LLI_LLI 2
#define PL080_LLI_CCTL 3
#define PL080S_LLI_CCTL2 4
/* Total words in an LLI. */
#define PL080_LLI_WORDS 4
#define PL080S_LLI_WORDS 8
/*
* Number of LLIs in each LLI buffer allocated for one transfer
* (maximum times we call dma_pool_alloc on this pool without freeing)
*/
#define MAX_NUM_TSFR_LLIS 512
#define PL08X_ALIGN 8
static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan)
{
return container_of(chan, struct pl08x_dma_chan, vc.chan);
}
static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct pl08x_txd, vd.tx);
}
/*
* Mux handling.
*
* This gives us the DMA request input to the PL08x primecell which the
* peripheral described by the channel data will be routed to, possibly
* via a board/SoC specific external MUX. One important point to note
* here is that this does not depend on the physical channel.
*/
static int pl08x_request_mux(struct pl08x_dma_chan *plchan)
{
const struct pl08x_platform_data *pd = plchan->host->pd;
int ret;
if (plchan->mux_use++ == 0 && pd->get_xfer_signal) {
ret = pd->get_xfer_signal(plchan->cd);
if (ret < 0) {
plchan->mux_use = 0;
return ret;
}
plchan->signal = ret;
}
return 0;
}
static void pl08x_release_mux(struct pl08x_dma_chan *plchan)
{
const struct pl08x_platform_data *pd = plchan->host->pd;
if (plchan->signal >= 0) {
WARN_ON(plchan->mux_use == 0);
if (--plchan->mux_use == 0 && pd->put_xfer_signal) {
pd->put_xfer_signal(plchan->cd, plchan->signal);
plchan->signal = -1;
}
}
}
/*
* Physical channel handling
*/
/* Whether a certain channel is busy or not */
static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch)
{
unsigned int val;
/* If we have a special busy register, take a shortcut */
if (ch->reg_busy) {
val = readl(ch->reg_busy);
return !!(val & BIT(ch->id));
}
val = readl(ch->reg_config);
return val & PL080_CONFIG_ACTIVE;
}
/*
* pl08x_write_lli() - Write an LLI into the DMA controller.
*
* The PL08x derivatives support linked lists, but the first item of the
* list containing the source, destination, control word and next LLI is
* ignored. Instead the driver has to write those values directly into the
* SRC, DST, LLI and control registers. On FTDMAC020 also the SIZE
* register need to be set up for the first transfer.
*/
static void pl08x_write_lli(struct pl08x_driver_data *pl08x,
struct pl08x_phy_chan *phychan, const u32 *lli, u32 ccfg)
{
if (pl08x->vd->pl080s)
dev_vdbg(&pl08x->adev->dev,
"WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
"clli=0x%08x, cctl=0x%08x, cctl2=0x%08x, ccfg=0x%08x\n",
phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST],
lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL],
lli[PL080S_LLI_CCTL2], ccfg);
else
dev_vdbg(&pl08x->adev->dev,
"WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
"clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n",
phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST],
lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL], ccfg);
writel_relaxed(lli[PL080_LLI_SRC], phychan->reg_src);
writel_relaxed(lli[PL080_LLI_DST], phychan->reg_dst);
writel_relaxed(lli[PL080_LLI_LLI], phychan->reg_lli);
/*
* The FTMAC020 has a different layout in the CCTL word of the LLI
* and the CCTL register which is split in CSR and SIZE registers.
* Convert the LLI item CCTL into the proper values to write into
* the CSR and SIZE registers.
*/
if (phychan->ftdmac020) {
u32 llictl = lli[PL080_LLI_CCTL];
u32 val = 0;
/* Write the transfer size (12 bits) to the size register */
writel_relaxed(llictl & FTDMAC020_LLI_TRANSFER_SIZE_MASK,
phychan->base + FTDMAC020_CH_SIZE);
/*
* Then write the control bits 28..16 to the control register
* by shuffleing the bits around to where they are in the
* main register. The mapping is as follows:
* Bit 28: TC_MSK - mask on all except last LLI
* Bit 27..25: SRC_WIDTH
* Bit 24..22: DST_WIDTH
* Bit 21..20: SRCAD_CTRL
* Bit 19..17: DSTAD_CTRL
* Bit 17: SRC_SEL
* Bit 16: DST_SEL
*/
if (llictl & FTDMAC020_LLI_TC_MSK)
val |= FTDMAC020_CH_CSR_TC_MSK;
val |= ((llictl & FTDMAC020_LLI_SRC_WIDTH_MSK) >>
(FTDMAC020_LLI_SRC_WIDTH_SHIFT -
FTDMAC020_CH_CSR_SRC_WIDTH_SHIFT));
val |= ((llictl & FTDMAC020_LLI_DST_WIDTH_MSK) >>
(FTDMAC020_LLI_DST_WIDTH_SHIFT -
FTDMAC020_CH_CSR_DST_WIDTH_SHIFT));
val |= ((llictl & FTDMAC020_LLI_SRCAD_CTL_MSK) >>
(FTDMAC020_LLI_SRCAD_CTL_SHIFT -
FTDMAC020_CH_CSR_SRCAD_CTL_SHIFT));
val |= ((llictl & FTDMAC020_LLI_DSTAD_CTL_MSK) >>
(FTDMAC020_LLI_DSTAD_CTL_SHIFT -
FTDMAC020_CH_CSR_DSTAD_CTL_SHIFT));
if (llictl & FTDMAC020_LLI_SRC_SEL)
val |= FTDMAC020_CH_CSR_SRC_SEL;
if (llictl & FTDMAC020_LLI_DST_SEL)
val |= FTDMAC020_CH_CSR_DST_SEL;
/*
* Set up the bits that exist in the CSR but are not
* part the LLI, i.e. only gets written to the control
* register right here.
*
* FIXME: do not just handle memcpy, also handle slave DMA.
*/
switch (pl08x->pd->memcpy_burst_size) {
default:
case PL08X_BURST_SZ_1:
val |= PL080_BSIZE_1 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_4:
val |= PL080_BSIZE_4 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_8:
val |= PL080_BSIZE_8 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_16:
val |= PL080_BSIZE_16 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_32:
val |= PL080_BSIZE_32 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_64:
val |= PL080_BSIZE_64 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_128:
val |= PL080_BSIZE_128 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_256:
val |= PL080_BSIZE_256 <<
FTDMAC020_CH_CSR_SRC_SIZE_SHIFT;
break;
}
/* Protection flags */
if (pl08x->pd->memcpy_prot_buff)
val |= FTDMAC020_CH_CSR_PROT2;
if (pl08x->pd->memcpy_prot_cache)
val |= FTDMAC020_CH_CSR_PROT3;
/* We are the kernel, so we are in privileged mode */
val |= FTDMAC020_CH_CSR_PROT1;
writel_relaxed(val, phychan->reg_control);
} else {
/* Bits are just identical */
writel_relaxed(lli[PL080_LLI_CCTL], phychan->reg_control);
}
/* Second control word on the PL080s */
if (pl08x->vd->pl080s)
writel_relaxed(lli[PL080S_LLI_CCTL2],
phychan->base + PL080S_CH_CONTROL2);
writel(ccfg, phychan->reg_config);
}
/*
* Set the initial DMA register values i.e. those for the first LLI
* The next LLI pointer and the configuration interrupt bit have
* been set when the LLIs were constructed. Poke them into the hardware
* and start the transfer.
*/
static void pl08x_start_next_txd(struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_phy_chan *phychan = plchan->phychan;
struct virt_dma_desc *vd = vchan_next_desc(&plchan->vc);
struct pl08x_txd *txd = to_pl08x_txd(&vd->tx);
u32 val;
list_del(&txd->vd.node);
plchan->at = txd;
/* Wait for channel inactive */
while (pl08x_phy_channel_busy(phychan))
cpu_relax();
pl08x_write_lli(pl08x, phychan, &txd->llis_va[0], txd->ccfg);
/* Enable the DMA channel */
/* Do not access config register until channel shows as disabled */
while (readl(pl08x->base + PL080_EN_CHAN) & BIT(phychan->id))
cpu_relax();
/* Do not access config register until channel shows as inactive */
if (phychan->ftdmac020) {
val = readl(phychan->reg_config);
while (val & FTDMAC020_CH_CFG_BUSY)
val = readl(phychan->reg_config);
val = readl(phychan->reg_control);
while (val & FTDMAC020_CH_CSR_EN)
val = readl(phychan->reg_control);
writel(val | FTDMAC020_CH_CSR_EN,
phychan->reg_control);
} else {
val = readl(phychan->reg_config);
while ((val & PL080_CONFIG_ACTIVE) ||
(val & PL080_CONFIG_ENABLE))
val = readl(phychan->reg_config);
writel(val | PL080_CONFIG_ENABLE, phychan->reg_config);
}
}
/*
* Pause the channel by setting the HALT bit.
*
* For M->P transfers, pause the DMAC first and then stop the peripheral -
* the FIFO can only drain if the peripheral is still requesting data.
* (note: this can still timeout if the DMAC FIFO never drains of data.)
*
* For P->M transfers, disable the peripheral first to stop it filling
* the DMAC FIFO, and then pause the DMAC.
*/
static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
{
u32 val;
int timeout;
if (ch->ftdmac020) {
/* Use the enable bit on the FTDMAC020 */
val = readl(ch->reg_control);
val &= ~FTDMAC020_CH_CSR_EN;
writel(val, ch->reg_control);
return;
}
/* Set the HALT bit and wait for the FIFO to drain */
val = readl(ch->reg_config);
val |= PL080_CONFIG_HALT;
writel(val, ch->reg_config);
/* Wait for channel inactive */
for (timeout = 1000; timeout; timeout--) {
if (!pl08x_phy_channel_busy(ch))
break;
udelay(1);
}
if (pl08x_phy_channel_busy(ch))
pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id);
}
static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)
{
u32 val;
/* Use the enable bit on the FTDMAC020 */
if (ch->ftdmac020) {
val = readl(ch->reg_control);
val |= FTDMAC020_CH_CSR_EN;
writel(val, ch->reg_control);
return;
}
/* Clear the HALT bit */
val = readl(ch->reg_config);
val &= ~PL080_CONFIG_HALT;
writel(val, ch->reg_config);
}
/*
* pl08x_terminate_phy_chan() stops the channel, clears the FIFO and
* clears any pending interrupt status. This should not be used for
* an on-going transfer, but as a method of shutting down a channel
* (eg, when it's no longer used) or terminating a transfer.
*/
static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x,
struct pl08x_phy_chan *ch)
{
u32 val;
/* The layout for the FTDMAC020 is different */
if (ch->ftdmac020) {
/* Disable all interrupts */
val = readl(ch->reg_config);
val |= (FTDMAC020_CH_CFG_INT_ABT_MASK |
FTDMAC020_CH_CFG_INT_ERR_MASK |
FTDMAC020_CH_CFG_INT_TC_MASK);
writel(val, ch->reg_config);
/* Abort and disable channel */
val = readl(ch->reg_control);
val &= ~FTDMAC020_CH_CSR_EN;
val |= FTDMAC020_CH_CSR_ABT;
writel(val, ch->reg_control);
/* Clear ABT and ERR interrupt flags */
writel(BIT(ch->id) | BIT(ch->id + 16),
pl08x->base + PL080_ERR_CLEAR);
writel(BIT(ch->id), pl08x->base + PL080_TC_CLEAR);
return;
}
val = readl(ch->reg_config);
val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK |
PL080_CONFIG_TC_IRQ_MASK);
writel(val, ch->reg_config);
writel(BIT(ch->id), pl08x->base + PL080_ERR_CLEAR);
writel(BIT(ch->id), pl08x->base + PL080_TC_CLEAR);
}
static u32 get_bytes_in_phy_channel(struct pl08x_phy_chan *ch)
{
u32 val;
u32 bytes;
if (ch->ftdmac020) {
bytes = readl(ch->base + FTDMAC020_CH_SIZE);
val = readl(ch->reg_control);
val &= FTDMAC020_CH_CSR_SRC_WIDTH_MSK;
val >>= FTDMAC020_CH_CSR_SRC_WIDTH_SHIFT;
} else if (ch->pl080s) {
val = readl(ch->base + PL080S_CH_CONTROL2);
bytes = val & PL080S_CONTROL_TRANSFER_SIZE_MASK;
val = readl(ch->reg_control);
val &= PL080_CONTROL_SWIDTH_MASK;
val >>= PL080_CONTROL_SWIDTH_SHIFT;
} else {
/* Plain PL08x */
val = readl(ch->reg_control);
bytes = val & PL080_CONTROL_TRANSFER_SIZE_MASK;
val &= PL080_CONTROL_SWIDTH_MASK;
val >>= PL080_CONTROL_SWIDTH_SHIFT;
}
switch (val) {
case PL080_WIDTH_8BIT:
break;
case PL080_WIDTH_16BIT:
bytes *= 2;
break;
case PL080_WIDTH_32BIT:
bytes *= 4;
break;
}
return bytes;
}
static u32 get_bytes_in_lli(struct pl08x_phy_chan *ch, const u32 *llis_va)
{
u32 val;
u32 bytes;
if (ch->ftdmac020) {
val = llis_va[PL080_LLI_CCTL];
bytes = val & FTDMAC020_LLI_TRANSFER_SIZE_MASK;
val = llis_va[PL080_LLI_CCTL];
val &= FTDMAC020_LLI_SRC_WIDTH_MSK;
val >>= FTDMAC020_LLI_SRC_WIDTH_SHIFT;
} else if (ch->pl080s) {
val = llis_va[PL080S_LLI_CCTL2];
bytes = val & PL080S_CONTROL_TRANSFER_SIZE_MASK;
val = llis_va[PL080_LLI_CCTL];
val &= PL080_CONTROL_SWIDTH_MASK;
val >>= PL080_CONTROL_SWIDTH_SHIFT;
} else {
/* Plain PL08x */
val = llis_va[PL080_LLI_CCTL];
bytes = val & PL080_CONTROL_TRANSFER_SIZE_MASK;
val &= PL080_CONTROL_SWIDTH_MASK;
val >>= PL080_CONTROL_SWIDTH_SHIFT;
}
switch (val) {
case PL080_WIDTH_8BIT:
break;
case PL080_WIDTH_16BIT:
bytes *= 2;
break;
case PL080_WIDTH_32BIT:
bytes *= 4;
break;
}
return bytes;
}
/* The channel should be paused when calling this */
static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
const u32 *llis_va, *llis_va_limit;
struct pl08x_phy_chan *ch;
dma_addr_t llis_bus;
struct pl08x_txd *txd;
u32 llis_max_words;
size_t bytes;
u32 clli;
ch = plchan->phychan;
txd = plchan->at;
if (!ch || !txd)
return 0;
/*
* Follow the LLIs to get the number of remaining
* bytes in the currently active transaction.
*/
clli = readl(ch->reg_lli) & ~PL080_LLI_LM_AHB2;
/* First get the remaining bytes in the active transfer */
bytes = get_bytes_in_phy_channel(ch);
if (!clli)
return bytes;
llis_va = txd->llis_va;
llis_bus = txd->llis_bus;
llis_max_words = pl08x->lli_words * MAX_NUM_TSFR_LLIS;
BUG_ON(clli < llis_bus || clli >= llis_bus +
sizeof(u32) * llis_max_words);
/*
* Locate the next LLI - as this is an array,
* it's simple maths to find.
*/
llis_va += (clli - llis_bus) / sizeof(u32);
llis_va_limit = llis_va + llis_max_words;
for (; llis_va < llis_va_limit; llis_va += pl08x->lli_words) {
bytes += get_bytes_in_lli(ch, llis_va);
/*
* A LLI pointer going backward terminates the LLI list
*/
if (llis_va[PL080_LLI_LLI] <= clli)
break;
}
return bytes;
}
/*
* Allocate a physical channel for a virtual channel
*
* Try to locate a physical channel to be used for this transfer. If all
* are taken return NULL and the requester will have to cope by using
* some fallback PIO mode or retrying later.
*/
static struct pl08x_phy_chan *
pl08x_get_phy_channel(struct pl08x_driver_data *pl08x,
struct pl08x_dma_chan *virt_chan)
{
struct pl08x_phy_chan *ch = NULL;
unsigned long flags;
int i;
for (i = 0; i < pl08x->vd->channels; i++) {
ch = &pl08x->phy_chans[i];
spin_lock_irqsave(&ch->lock, flags);
if (!ch->locked && !ch->serving) {
ch->serving = virt_chan;
spin_unlock_irqrestore(&ch->lock, flags);
break;
}
spin_unlock_irqrestore(&ch->lock, flags);
}
if (i == pl08x->vd->channels) {
/* No physical channel available, cope with it */
return NULL;
}
return ch;
}
/* Mark the physical channel as free. Note, this write is atomic. */
static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
struct pl08x_phy_chan *ch)
{
ch->serving = NULL;
}
/*
* Try to allocate a physical channel. When successful, assign it to
* this virtual channel, and initiate the next descriptor. The
* virtual channel lock must be held at this point.
*/
static void pl08x_phy_alloc_and_start(struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_phy_chan *ch;
ch = pl08x_get_phy_channel(pl08x, plchan);
if (!ch) {
dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name);
plchan->state = PL08X_CHAN_WAITING;
plchan->waiting_at = jiffies;
return;
}
dev_dbg(&pl08x->adev->dev, "allocated physical channel %d for xfer on %s\n",
ch->id, plchan->name);
plchan->phychan = ch;
plchan->state = PL08X_CHAN_RUNNING;
pl08x_start_next_txd(plchan);
}
static void pl08x_phy_reassign_start(struct pl08x_phy_chan *ch,
struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
dev_dbg(&pl08x->adev->dev, "reassigned physical channel %d for xfer on %s\n",
ch->id, plchan->name);
/*
* We do this without taking the lock; we're really only concerned
* about whether this pointer is NULL or not, and we're guaranteed
* that this will only be called when it _already_ is non-NULL.
*/
ch->serving = plchan;
plchan->phychan = ch;
plchan->state = PL08X_CHAN_RUNNING;
pl08x_start_next_txd(plchan);
}
/*
* Free a physical DMA channel, potentially reallocating it to another
* virtual channel if we have any pending.
*/
static void pl08x_phy_free(struct pl08x_dma_chan *plchan)
{
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_dma_chan *p, *next;
unsigned long waiting_at;
retry:
next = NULL;
waiting_at = jiffies;
/*
* Find a waiting virtual channel for the next transfer.
* To be fair, time when each channel reached waiting state is compared
* to select channel that is waiting for the longest time.
*/
list_for_each_entry(p, &pl08x->memcpy.channels, vc.chan.device_node)
if (p->state == PL08X_CHAN_WAITING &&
p->waiting_at <= waiting_at) {
next = p;
waiting_at = p->waiting_at;
}
if (!next && pl08x->has_slave) {
list_for_each_entry(p, &pl08x->slave.channels, vc.chan.device_node)
if (p->state == PL08X_CHAN_WAITING &&
p->waiting_at <= waiting_at) {
next = p;
waiting_at = p->waiting_at;
}
}
/* Ensure that the physical channel is stopped */
pl08x_terminate_phy_chan(pl08x, plchan->phychan);
if (next) {
bool success;
/*
* Eww. We know this isn't going to deadlock
* but lockdep probably doesn't.
*/
spin_lock(&next->vc.lock);
/* Re-check the state now that we have the lock */
success = next->state == PL08X_CHAN_WAITING;
if (success)
pl08x_phy_reassign_start(plchan->phychan, next);
spin_unlock(&next->vc.lock);
/* If the state changed, try to find another channel */
if (!success)
goto retry;
} else {
/* No more jobs, so free up the physical channel */
pl08x_put_phy_channel(pl08x, plchan->phychan);
}
plchan->phychan = NULL;
plchan->state = PL08X_CHAN_IDLE;
}
/*
* LLI handling
*/
static inline unsigned int
pl08x_get_bytes_for_lli(struct pl08x_driver_data *pl08x,
u32 cctl,
bool source)
{
u32 val;
if (pl08x->vd->ftdmac020) {
if (source)
val = (cctl & FTDMAC020_LLI_SRC_WIDTH_MSK) >>
FTDMAC020_LLI_SRC_WIDTH_SHIFT;
else
val = (cctl & FTDMAC020_LLI_DST_WIDTH_MSK) >>
FTDMAC020_LLI_DST_WIDTH_SHIFT;
} else {
if (source)
val = (cctl & PL080_CONTROL_SWIDTH_MASK) >>
PL080_CONTROL_SWIDTH_SHIFT;
else
val = (cctl & PL080_CONTROL_DWIDTH_MASK) >>
PL080_CONTROL_DWIDTH_SHIFT;
}
switch (val) {
case PL080_WIDTH_8BIT:
return 1;
case PL080_WIDTH_16BIT:
return 2;
case PL080_WIDTH_32BIT:
return 4;
default:
break;
}
BUG();
return 0;
}
static inline u32 pl08x_lli_control_bits(struct pl08x_driver_data *pl08x,
u32 cctl,
u8 srcwidth, u8 dstwidth,
size_t tsize)
{
u32 retbits = cctl;
/*
* Remove all src, dst and transfer size bits, then set the
* width and size according to the parameters. The bit offsets
* are different in the FTDMAC020 so we need to accound for this.
*/
if (pl08x->vd->ftdmac020) {
retbits &= ~FTDMAC020_LLI_DST_WIDTH_MSK;
retbits &= ~FTDMAC020_LLI_SRC_WIDTH_MSK;
retbits &= ~FTDMAC020_LLI_TRANSFER_SIZE_MASK;
switch (srcwidth) {
case 1:
retbits |= PL080_WIDTH_8BIT <<
FTDMAC020_LLI_SRC_WIDTH_SHIFT;
break;
case 2:
retbits |= PL080_WIDTH_16BIT <<
FTDMAC020_LLI_SRC_WIDTH_SHIFT;
break;
case 4:
retbits |= PL080_WIDTH_32BIT <<
FTDMAC020_LLI_SRC_WIDTH_SHIFT;
break;
default:
BUG();
break;
}
switch (dstwidth) {
case 1:
retbits |= PL080_WIDTH_8BIT <<
FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
case 2:
retbits |= PL080_WIDTH_16BIT <<
FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
case 4:
retbits |= PL080_WIDTH_32BIT <<
FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
default:
BUG();
break;
}
tsize &= FTDMAC020_LLI_TRANSFER_SIZE_MASK;
retbits |= tsize << FTDMAC020_LLI_TRANSFER_SIZE_SHIFT;
} else {
retbits &= ~PL080_CONTROL_DWIDTH_MASK;
retbits &= ~PL080_CONTROL_SWIDTH_MASK;
retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK;
switch (srcwidth) {
case 1:
retbits |= PL080_WIDTH_8BIT <<
PL080_CONTROL_SWIDTH_SHIFT;
break;
case 2:
retbits |= PL080_WIDTH_16BIT <<
PL080_CONTROL_SWIDTH_SHIFT;
break;
case 4:
retbits |= PL080_WIDTH_32BIT <<
PL080_CONTROL_SWIDTH_SHIFT;
break;
default:
BUG();
break;
}
switch (dstwidth) {
case 1:
retbits |= PL080_WIDTH_8BIT <<
PL080_CONTROL_DWIDTH_SHIFT;
break;
case 2:
retbits |= PL080_WIDTH_16BIT <<
PL080_CONTROL_DWIDTH_SHIFT;
break;
case 4:
retbits |= PL080_WIDTH_32BIT <<
PL080_CONTROL_DWIDTH_SHIFT;
break;
default:
BUG();
break;
}
tsize &= PL080_CONTROL_TRANSFER_SIZE_MASK;
retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT;
}
return retbits;
}
struct pl08x_lli_build_data {
struct pl08x_txd *txd;
struct pl08x_bus_data srcbus;
struct pl08x_bus_data dstbus;
size_t remainder;
u32 lli_bus;
};
/*
* Autoselect a master bus to use for the transfer. Slave will be the chosen as
* victim in case src & dest are not similarly aligned. i.e. If after aligning
* masters address with width requirements of transfer (by sending few byte by
* byte data), slave is still not aligned, then its width will be reduced to
* BYTE.
* - prefers the destination bus if both available
* - prefers bus with fixed address (i.e. peripheral)
*/
static void pl08x_choose_master_bus(struct pl08x_driver_data *pl08x,
struct pl08x_lli_build_data *bd,
struct pl08x_bus_data **mbus,
struct pl08x_bus_data **sbus,
u32 cctl)
{
bool dst_incr;
bool src_incr;
/*
* The FTDMAC020 only supports memory-to-memory transfer, so
* source and destination always increase.
*/
if (pl08x->vd->ftdmac020) {
dst_incr = true;
src_incr = true;
} else {
dst_incr = !!(cctl & PL080_CONTROL_DST_INCR);
src_incr = !!(cctl & PL080_CONTROL_SRC_INCR);
}
/*
* If either bus is not advancing, i.e. it is a peripheral, that
* one becomes master
*/
if (!dst_incr) {
*mbus = &bd->dstbus;
*sbus = &bd->srcbus;
} else if (!src_incr) {
*mbus = &bd->srcbus;
*sbus = &bd->dstbus;
} else {
if (bd->dstbus.buswidth >= bd->srcbus.buswidth) {
*mbus = &bd->dstbus;
*sbus = &bd->srcbus;
} else {
*mbus = &bd->srcbus;
*sbus = &bd->dstbus;
}
}
}
/*
* Fills in one LLI for a certain transfer descriptor and advance the counter
*/
static void pl08x_fill_lli_for_desc(struct pl08x_driver_data *pl08x,
struct pl08x_lli_build_data *bd,
int num_llis, int len, u32 cctl, u32 cctl2)
{
u32 offset = num_llis * pl08x->lli_words;
u32 *llis_va = bd->txd->llis_va + offset;
dma_addr_t llis_bus = bd->txd->llis_bus;
BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS);
/* Advance the offset to next LLI. */
offset += pl08x->lli_words;
llis_va[PL080_LLI_SRC] = bd->srcbus.addr;
llis_va[PL080_LLI_DST] = bd->dstbus.addr;
llis_va[PL080_LLI_LLI] = (llis_bus + sizeof(u32) * offset);
llis_va[PL080_LLI_LLI] |= bd->lli_bus;
llis_va[PL080_LLI_CCTL] = cctl;
if (pl08x->vd->pl080s)
llis_va[PL080S_LLI_CCTL2] = cctl2;
if (pl08x->vd->ftdmac020) {
/* FIXME: only memcpy so far so both increase */
bd->srcbus.addr += len;
bd->dstbus.addr += len;
} else {
if (cctl & PL080_CONTROL_SRC_INCR)
bd->srcbus.addr += len;
if (cctl & PL080_CONTROL_DST_INCR)
bd->dstbus.addr += len;
}
BUG_ON(bd->remainder < len);
bd->remainder -= len;
}
static inline void prep_byte_width_lli(struct pl08x_driver_data *pl08x,
struct pl08x_lli_build_data *bd, u32 *cctl, u32 len,
int num_llis, size_t *total_bytes)
{
*cctl = pl08x_lli_control_bits(pl08x, *cctl, 1, 1, len);
pl08x_fill_lli_for_desc(pl08x, bd, num_llis, len, *cctl, len);
(*total_bytes) += len;
}
#if 1
static void pl08x_dump_lli(struct pl08x_driver_data *pl08x,
const u32 *llis_va, int num_llis)
{
int i;
if (pl08x->vd->pl080s) {
dev_vdbg(&pl08x->adev->dev,
"%-3s %-9s %-10s %-10s %-10s %-10s %s\n",
"lli", "", "csrc", "cdst", "clli", "cctl", "cctl2");
for (i = 0; i < num_llis; i++) {
dev_vdbg(&pl08x->adev->dev,
"%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
i, llis_va, llis_va[PL080_LLI_SRC],
llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI],
llis_va[PL080_LLI_CCTL],
llis_va[PL080S_LLI_CCTL2]);
llis_va += pl08x->lli_words;
}
} else {
dev_vdbg(&pl08x->adev->dev,
"%-3s %-9s %-10s %-10s %-10s %s\n",
"lli", "", "csrc", "cdst", "clli", "cctl");
for (i = 0; i < num_llis; i++) {
dev_vdbg(&pl08x->adev->dev,
"%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n",
i, llis_va, llis_va[PL080_LLI_SRC],
llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI],
llis_va[PL080_LLI_CCTL]);
llis_va += pl08x->lli_words;
}
}
}
#else
static inline void pl08x_dump_lli(struct pl08x_driver_data *pl08x,
const u32 *llis_va, int num_llis) {}
#endif
/*
* This fills in the table of LLIs for the transfer descriptor
* Note that we assume we never have to change the burst sizes
* Return 0 for error
*/
static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
struct pl08x_txd *txd)
{
struct pl08x_bus_data *mbus, *sbus;
struct pl08x_lli_build_data bd;
int num_llis = 0;
u32 cctl, early_bytes = 0;
size_t max_bytes_per_lli, total_bytes;
u32 *llis_va, *last_lli;
struct pl08x_sg *dsg;
txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus);
if (!txd->llis_va) {
dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__);
return 0;
}
bd.txd = txd;
bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0;
cctl = txd->cctl;
/* Find maximum width of the source bus */
bd.srcbus.maxwidth = pl08x_get_bytes_for_lli(pl08x, cctl, true);
/* Find maximum width of the destination bus */
bd.dstbus.maxwidth = pl08x_get_bytes_for_lli(pl08x, cctl, false);
list_for_each_entry(dsg, &txd->dsg_list, node) {
total_bytes = 0;
cctl = txd->cctl;
bd.srcbus.addr = dsg->src_addr;
bd.dstbus.addr = dsg->dst_addr;
bd.remainder = dsg->len;
bd.srcbus.buswidth = bd.srcbus.maxwidth;
bd.dstbus.buswidth = bd.dstbus.maxwidth;
pl08x_choose_master_bus(pl08x, &bd, &mbus, &sbus, cctl);
dev_vdbg(&pl08x->adev->dev,
"src=0x%08llx%s/%u dst=0x%08llx%s/%u len=%zu\n",
(u64)bd.srcbus.addr,
cctl & PL080_CONTROL_SRC_INCR ? "+" : "",
bd.srcbus.buswidth,
(u64)bd.dstbus.addr,
cctl & PL080_CONTROL_DST_INCR ? "+" : "",
bd.dstbus.buswidth,
bd.remainder);
dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n",
mbus == &bd.srcbus ? "src" : "dst",
sbus == &bd.srcbus ? "src" : "dst");
/*
* Zero length is only allowed if all these requirements are
* met:
* - flow controller is peripheral.
* - src.addr is aligned to src.width
* - dst.addr is aligned to dst.width
*
* sg_len == 1 should be true, as there can be two cases here:
*
* - Memory addresses are contiguous and are not scattered.
* Here, Only one sg will be passed by user driver, with
* memory address and zero length. We pass this to controller
* and after the transfer it will receive the last burst
* request from peripheral and so transfer finishes.
*
* - Memory addresses are scattered and are not contiguous.
* Here, Obviously as DMA controller doesn't know when a lli's
* transfer gets over, it can't load next lli. So in this
* case, there has to be an assumption that only one lli is
* supported. Thus, we can't have scattered addresses.
*/
if (!bd.remainder) {
u32 fc;
/* FTDMAC020 only does memory-to-memory */
if (pl08x->vd->ftdmac020)
fc = PL080_FLOW_MEM2MEM;
else
fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >>
PL080_CONFIG_FLOW_CONTROL_SHIFT;
if (!((fc >= PL080_FLOW_SRC2DST_DST) &&
(fc <= PL080_FLOW_SRC2DST_SRC))) {
dev_err(&pl08x->adev->dev, "%s sg len can't be zero",
__func__);
return 0;
}
if (!IS_BUS_ALIGNED(&bd.srcbus) ||
!IS_BUS_ALIGNED(&bd.dstbus)) {
dev_err(&pl08x->adev->dev,
"%s src & dst address must be aligned to src"
" & dst width if peripheral is flow controller",
__func__);
return 0;
}
cctl = pl08x_lli_control_bits(pl08x, cctl,
bd.srcbus.buswidth, bd.dstbus.buswidth,
0);
pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++,
0, cctl, 0);
break;
}
/*
* Send byte by byte for following cases
* - Less than a bus width available
* - until master bus is aligned
*/
if (bd.remainder < mbus->buswidth)
early_bytes = bd.remainder;
else if (!IS_BUS_ALIGNED(mbus)) {
early_bytes = mbus->buswidth -
(mbus->addr & (mbus->buswidth - 1));
if ((bd.remainder - early_bytes) < mbus->buswidth)
early_bytes = bd.remainder;
}
if (early_bytes) {
dev_vdbg(&pl08x->adev->dev,
"%s byte width LLIs (remain 0x%08zx)\n",
__func__, bd.remainder);
prep_byte_width_lli(pl08x, &bd, &cctl, early_bytes,
num_llis++, &total_bytes);
}
if (bd.remainder) {
/*
* Master now aligned
* - if slave is not then we must set its width down
*/
if (!IS_BUS_ALIGNED(sbus)) {
dev_dbg(&pl08x->adev->dev,
"%s set down bus width to one byte\n",
__func__);
sbus->buswidth = 1;
}
/*
* Bytes transferred = tsize * src width, not
* MIN(buswidths)
*/
max_bytes_per_lli = bd.srcbus.buswidth *
pl08x->vd->max_transfer_size;
dev_vdbg(&pl08x->adev->dev,
"%s max bytes per lli = %zu\n",
__func__, max_bytes_per_lli);
/*
* Make largest possible LLIs until less than one bus
* width left
*/
while (bd.remainder > (mbus->buswidth - 1)) {
size_t lli_len, tsize, width;
/*
* If enough left try to send max possible,
* otherwise try to send the remainder
*/
lli_len = min(bd.remainder, max_bytes_per_lli);
/*
* Check against maximum bus alignment:
* Calculate actual transfer size in relation to
* bus width an get a maximum remainder of the
* highest bus width - 1
*/
width = max(mbus->buswidth, sbus->buswidth);
lli_len = (lli_len / width) * width;
tsize = lli_len / bd.srcbus.buswidth;
dev_vdbg(&pl08x->adev->dev,
"%s fill lli with single lli chunk of "
"size 0x%08zx (remainder 0x%08zx)\n",
__func__, lli_len, bd.remainder);
cctl = pl08x_lli_control_bits(pl08x, cctl,
bd.srcbus.buswidth, bd.dstbus.buswidth,
tsize);
pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++,
lli_len, cctl, tsize);
total_bytes += lli_len;
}
/*
* Send any odd bytes
*/
if (bd.remainder) {
dev_vdbg(&pl08x->adev->dev,
"%s align with boundary, send odd bytes (remain %zu)\n",
__func__, bd.remainder);
prep_byte_width_lli(pl08x, &bd, &cctl,
bd.remainder, num_llis++, &total_bytes);
}
}
if (total_bytes != dsg->len) {
dev_err(&pl08x->adev->dev,
"%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n",
__func__, total_bytes, dsg->len);
return 0;
}
if (num_llis >= MAX_NUM_TSFR_LLIS) {
dev_err(&pl08x->adev->dev,
"%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n",
__func__, MAX_NUM_TSFR_LLIS);
return 0;
}
}
llis_va = txd->llis_va;
last_lli = llis_va + (num_llis - 1) * pl08x->lli_words;
if (txd->cyclic) {
/* Link back to the first LLI. */
last_lli[PL080_LLI_LLI] = txd->llis_bus | bd.lli_bus;
} else {
/* The final LLI terminates the LLI. */
last_lli[PL080_LLI_LLI] = 0;
/* The final LLI element shall also fire an interrupt. */
if (pl08x->vd->ftdmac020)
last_lli[PL080_LLI_CCTL] &= ~FTDMAC020_LLI_TC_MSK;
else
last_lli[PL080_LLI_CCTL] |= PL080_CONTROL_TC_IRQ_EN;
}
pl08x_dump_lli(pl08x, llis_va, num_llis);
return num_llis;
}
static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
struct pl08x_txd *txd)
{
struct pl08x_sg *dsg, *_dsg;
if (txd->llis_va)
dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus);
list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) {
list_del(&dsg->node);
kfree(dsg);
}
kfree(txd);
}
static void pl08x_desc_free(struct virt_dma_desc *vd)
{
struct pl08x_txd *txd = to_pl08x_txd(&vd->tx);
struct pl08x_dma_chan *plchan = to_pl08x_chan(vd->tx.chan);
dma_descriptor_unmap(&vd->tx);
if (!txd->done)
pl08x_release_mux(plchan);
pl08x_free_txd(plchan->host, txd);
}
static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
struct pl08x_dma_chan *plchan)
{
LIST_HEAD(head);
vchan_get_all_descriptors(&plchan->vc, &head);
vchan_dma_desc_free_list(&plchan->vc, &head);
}
/*
* The DMA ENGINE API
*/
static void pl08x_free_chan_resources(struct dma_chan *chan)
{
/* Ensure all queued descriptors are freed */
vchan_free_chan_resources(to_virt_chan(chan));
}
/*
* Code accessing dma_async_is_complete() in a tight loop may give problems.
* If slaves are relying on interrupts to signal completion this function
* must not be called with interrupts disabled.
*/
static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct virt_dma_desc *vd;
unsigned long flags;
enum dma_status ret;
size_t bytes = 0;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
/*
* There's no point calculating the residue if there's
* no txstate to store the value.
*/
if (!txstate) {
if (plchan->state == PL08X_CHAN_PAUSED)
ret = DMA_PAUSED;
return ret;
}
spin_lock_irqsave(&plchan->vc.lock, flags);
ret = dma_cookie_status(chan, cookie, txstate);
if (ret != DMA_COMPLETE) {
vd = vchan_find_desc(&plchan->vc, cookie);
if (vd) {
/* On the issued list, so hasn't been processed yet */
struct pl08x_txd *txd = to_pl08x_txd(&vd->tx);
struct pl08x_sg *dsg;
list_for_each_entry(dsg, &txd->dsg_list, node)
bytes += dsg->len;
} else {
bytes = pl08x_getbytes_chan(plchan);
}
}
spin_unlock_irqrestore(&plchan->vc.lock, flags);
/*
* This cookie not complete yet
* Get number of bytes left in the active transactions and queue
*/
dma_set_residue(txstate, bytes);
if (plchan->state == PL08X_CHAN_PAUSED && ret == DMA_IN_PROGRESS)
ret = DMA_PAUSED;
/* Whether waiting or running, we're in progress */
return ret;
}
/* PrimeCell DMA extension */
struct burst_table {
u32 burstwords;
u32 reg;
};
static const struct burst_table burst_sizes[] = {
{
.burstwords = 256,
.reg = PL080_BSIZE_256,
},
{
.burstwords = 128,
.reg = PL080_BSIZE_128,
},
{
.burstwords = 64,
.reg = PL080_BSIZE_64,
},
{
.burstwords = 32,
.reg = PL080_BSIZE_32,
},
{
.burstwords = 16,
.reg = PL080_BSIZE_16,
},
{
.burstwords = 8,
.reg = PL080_BSIZE_8,
},
{
.burstwords = 4,
.reg = PL080_BSIZE_4,
},
{
.burstwords = 0,
.reg = PL080_BSIZE_1,
},
};
/*
* Given the source and destination available bus masks, select which
* will be routed to each port. We try to have source and destination
* on separate ports, but always respect the allowable settings.
*/
static u32 pl08x_select_bus(bool ftdmac020, u8 src, u8 dst)
{
u32 cctl = 0;
u32 dst_ahb2;
u32 src_ahb2;
/* The FTDMAC020 use different bits to indicate src/dst bus */
if (ftdmac020) {
dst_ahb2 = FTDMAC020_LLI_DST_SEL;
src_ahb2 = FTDMAC020_LLI_SRC_SEL;
} else {
dst_ahb2 = PL080_CONTROL_DST_AHB2;
src_ahb2 = PL080_CONTROL_SRC_AHB2;
}
if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1)))
cctl |= dst_ahb2;
if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2)))
cctl |= src_ahb2;
return cctl;
}
static u32 pl08x_cctl(u32 cctl)
{
cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 |
PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
PL080_CONTROL_PROT_MASK);
/* Access the cell in privileged mode, non-bufferable, non-cacheable */
return cctl | PL080_CONTROL_PROT_SYS;
}
static u32 pl08x_width(enum dma_slave_buswidth width)
{
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
return PL080_WIDTH_8BIT;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
return PL080_WIDTH_16BIT;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
return PL080_WIDTH_32BIT;
default:
return ~0;
}
}
static u32 pl08x_burst(u32 maxburst)
{
int i;
for (i = 0; i < ARRAY_SIZE(burst_sizes); i++)
if (burst_sizes[i].burstwords <= maxburst)
break;
return burst_sizes[i].reg;
}
static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan,
enum dma_slave_buswidth addr_width, u32 maxburst)
{
u32 width, burst, cctl = 0;
width = pl08x_width(addr_width);
if (width == ~0)
return ~0;
cctl |= width << PL080_CONTROL_SWIDTH_SHIFT;
cctl |= width << PL080_CONTROL_DWIDTH_SHIFT;
/*
* If this channel will only request single transfers, set this
* down to ONE element. Also select one element if no maxburst
* is specified.
*/
if (plchan->cd->single)
maxburst = 1;
burst = pl08x_burst(maxburst);
cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT;
cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT;
return pl08x_cctl(cctl);
}
/*
* Slave transactions callback to the slave device to allow
* synchronization of slave DMA signals with the DMAC enable
*/
static void pl08x_issue_pending(struct dma_chan *chan)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
unsigned long flags;
spin_lock_irqsave(&plchan->vc.lock, flags);
if (vchan_issue_pending(&plchan->vc)) {
if (!plchan->phychan && plchan->state != PL08X_CHAN_WAITING)
pl08x_phy_alloc_and_start(plchan);
}
spin_unlock_irqrestore(&plchan->vc.lock, flags);
}
static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan)
{
struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (txd)
INIT_LIST_HEAD(&txd->dsg_list);
return txd;
}
static u32 pl08x_memcpy_cctl(struct pl08x_driver_data *pl08x)
{
u32 cctl = 0;
/* Conjure cctl */
switch (pl08x->pd->memcpy_burst_size) {
default:
dev_err(&pl08x->adev->dev,
"illegal burst size for memcpy, set to 1\n");
fallthrough;
case PL08X_BURST_SZ_1:
cctl |= PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_4:
cctl |= PL080_BSIZE_4 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_4 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_8:
cctl |= PL080_BSIZE_8 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_8 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_16:
cctl |= PL080_BSIZE_16 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_16 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_32:
cctl |= PL080_BSIZE_32 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_32 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_64:
cctl |= PL080_BSIZE_64 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_64 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_128:
cctl |= PL080_BSIZE_128 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_128 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
case PL08X_BURST_SZ_256:
cctl |= PL080_BSIZE_256 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_256 << PL080_CONTROL_DB_SIZE_SHIFT;
break;
}
switch (pl08x->pd->memcpy_bus_width) {
default:
dev_err(&pl08x->adev->dev,
"illegal bus width for memcpy, set to 8 bits\n");
fallthrough;
case PL08X_BUS_WIDTH_8_BITS:
cctl |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT |
PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT;
break;
case PL08X_BUS_WIDTH_16_BITS:
cctl |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT |
PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT;
break;
case PL08X_BUS_WIDTH_32_BITS:
cctl |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT |
PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT;
break;
}
/* Protection flags */
if (pl08x->pd->memcpy_prot_buff)
cctl |= PL080_CONTROL_PROT_BUFF;
if (pl08x->pd->memcpy_prot_cache)
cctl |= PL080_CONTROL_PROT_CACHE;
/* We are the kernel, so we are in privileged mode */
cctl |= PL080_CONTROL_PROT_SYS;
/* Both to be incremented or the code will break */
cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;
if (pl08x->vd->dualmaster)
cctl |= pl08x_select_bus(false,
pl08x->mem_buses,
pl08x->mem_buses);
return cctl;
}
static u32 pl08x_ftdmac020_memcpy_cctl(struct pl08x_driver_data *pl08x)
{
u32 cctl = 0;
/* Conjure cctl */
switch (pl08x->pd->memcpy_bus_width) {
default:
dev_err(&pl08x->adev->dev,
"illegal bus width for memcpy, set to 8 bits\n");
fallthrough;
case PL08X_BUS_WIDTH_8_BITS:
cctl |= PL080_WIDTH_8BIT << FTDMAC020_LLI_SRC_WIDTH_SHIFT |
PL080_WIDTH_8BIT << FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
case PL08X_BUS_WIDTH_16_BITS:
cctl |= PL080_WIDTH_16BIT << FTDMAC020_LLI_SRC_WIDTH_SHIFT |
PL080_WIDTH_16BIT << FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
case PL08X_BUS_WIDTH_32_BITS:
cctl |= PL080_WIDTH_32BIT << FTDMAC020_LLI_SRC_WIDTH_SHIFT |
PL080_WIDTH_32BIT << FTDMAC020_LLI_DST_WIDTH_SHIFT;
break;
}
/*
* By default mask the TC IRQ on all LLIs, it will be unmasked on
* the last LLI item by other code.
*/
cctl |= FTDMAC020_LLI_TC_MSK;
/*
* Both to be incremented so leave bits FTDMAC020_LLI_SRCAD_CTL
* and FTDMAC020_LLI_DSTAD_CTL as zero
*/
if (pl08x->vd->dualmaster)
cctl |= pl08x_select_bus(true,
pl08x->mem_buses,
pl08x->mem_buses);
return cctl;
}
/*
* Initialize a descriptor to be used by memcpy submit
*/
static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_txd *txd;
struct pl08x_sg *dsg;
int ret;
txd = pl08x_get_txd(plchan);
if (!txd) {
dev_err(&pl08x->adev->dev,
"%s no memory for descriptor\n", __func__);
return NULL;
}
dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT);
if (!dsg) {
pl08x_free_txd(pl08x, txd);
return NULL;
}
list_add_tail(&dsg->node, &txd->dsg_list);
dsg->src_addr = src;
dsg->dst_addr = dest;
dsg->len = len;
if (pl08x->vd->ftdmac020) {
/* Writing CCFG zero ENABLES all interrupts */
txd->ccfg = 0;
txd->cctl = pl08x_ftdmac020_memcpy_cctl(pl08x);
} else {
txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK |
PL080_CONFIG_TC_IRQ_MASK |
PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
txd->cctl = pl08x_memcpy_cctl(pl08x);
}
ret = pl08x_fill_llis_for_desc(plchan->host, txd);
if (!ret) {
pl08x_free_txd(pl08x, txd);
return NULL;
}
return vchan_tx_prep(&plchan->vc, &txd->vd, flags);
}
static struct pl08x_txd *pl08x_init_txd(
struct dma_chan *chan,
enum dma_transfer_direction direction,
dma_addr_t *slave_addr)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_txd *txd;
enum dma_slave_buswidth addr_width;
int ret, tmp;
u8 src_buses, dst_buses;
u32 maxburst, cctl;
txd = pl08x_get_txd(plchan);
if (!txd) {
dev_err(&pl08x->adev->dev, "%s no txd\n", __func__);
return NULL;
}
/*
* Set up addresses, the PrimeCell configured address
* will take precedence since this may configure the
* channel target address dynamically at runtime.
*/
if (direction == DMA_MEM_TO_DEV) {
cctl = PL080_CONTROL_SRC_INCR;
*slave_addr = plchan->cfg.dst_addr;
addr_width = plchan->cfg.dst_addr_width;
maxburst = plchan->cfg.dst_maxburst;
src_buses = pl08x->mem_buses;
dst_buses = plchan->cd->periph_buses;
} else if (direction == DMA_DEV_TO_MEM) {
cctl = PL080_CONTROL_DST_INCR;
*slave_addr = plchan->cfg.src_addr;
addr_width = plchan->cfg.src_addr_width;
maxburst = plchan->cfg.src_maxburst;
src_buses = plchan->cd->periph_buses;
dst_buses = pl08x->mem_buses;
} else {
pl08x_free_txd(pl08x, txd);
dev_err(&pl08x->adev->dev,
"%s direction unsupported\n", __func__);
return NULL;
}
cctl |= pl08x_get_cctl(plchan, addr_width, maxburst);
if (cctl == ~0) {
pl08x_free_txd(pl08x, txd);
dev_err(&pl08x->adev->dev,
"DMA slave configuration botched?\n");
return NULL;
}
txd->cctl = cctl | pl08x_select_bus(false, src_buses, dst_buses);
if (plchan->cfg.device_fc)
tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER :
PL080_FLOW_PER2MEM_PER;
else
tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER :
PL080_FLOW_PER2MEM;
txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK |
PL080_CONFIG_TC_IRQ_MASK |
tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT;
ret = pl08x_request_mux(plchan);
if (ret < 0) {
pl08x_free_txd(pl08x, txd);
dev_dbg(&pl08x->adev->dev,
"unable to mux for transfer on %s due to platform restrictions\n",
plchan->name);
return NULL;
}
dev_dbg(&pl08x->adev->dev, "allocated DMA request signal %d for xfer on %s\n",
plchan->signal, plchan->name);
/* Assign the flow control signal to this channel */
if (direction == DMA_MEM_TO_DEV)
txd->ccfg |= plchan->signal << PL080_CONFIG_DST_SEL_SHIFT;
else
txd->ccfg |= plchan->signal << PL080_CONFIG_SRC_SEL_SHIFT;
return txd;
}
static int pl08x_tx_add_sg(struct pl08x_txd *txd,
enum dma_transfer_direction direction,
dma_addr_t slave_addr,
dma_addr_t buf_addr,
unsigned int len)
{
struct pl08x_sg *dsg;
dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT);
if (!dsg)
return -ENOMEM;
list_add_tail(&dsg->node, &txd->dsg_list);
dsg->len = len;
if (direction == DMA_MEM_TO_DEV) {
dsg->src_addr = buf_addr;
dsg->dst_addr = slave_addr;
} else {
dsg->src_addr = slave_addr;
dsg->dst_addr = buf_addr;
}
return 0;
}
static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_txd *txd;
struct scatterlist *sg;
int ret, tmp;
dma_addr_t slave_addr;
dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n",
__func__, sg_dma_len(sgl), plchan->name);
txd = pl08x_init_txd(chan, direction, &slave_addr);
if (!txd)
return NULL;
for_each_sg(sgl, sg, sg_len, tmp) {
ret = pl08x_tx_add_sg(txd, direction, slave_addr,
sg_dma_address(sg),
sg_dma_len(sg));
if (ret) {
pl08x_release_mux(plchan);
pl08x_free_txd(pl08x, txd);
dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n",
__func__);
return NULL;
}
}
ret = pl08x_fill_llis_for_desc(plchan->host, txd);
if (!ret) {
pl08x_release_mux(plchan);
pl08x_free_txd(pl08x, txd);
return NULL;
}
return vchan_tx_prep(&plchan->vc, &txd->vd, flags);
}
static struct dma_async_tx_descriptor *pl08x_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
struct pl08x_txd *txd;
int ret, tmp;
dma_addr_t slave_addr;
dev_dbg(&pl08x->adev->dev,
"%s prepare cyclic transaction of %zd/%zd bytes %s %s\n",
__func__, period_len, buf_len,
direction == DMA_MEM_TO_DEV ? "to" : "from",
plchan->name);
txd = pl08x_init_txd(chan, direction, &slave_addr);
if (!txd)
return NULL;
txd->cyclic = true;
txd->cctl |= PL080_CONTROL_TC_IRQ_EN;
for (tmp = 0; tmp < buf_len; tmp += period_len) {
ret = pl08x_tx_add_sg(txd, direction, slave_addr,
buf_addr + tmp, period_len);
if (ret) {
pl08x_release_mux(plchan);
pl08x_free_txd(pl08x, txd);
return NULL;
}
}
ret = pl08x_fill_llis_for_desc(plchan->host, txd);
if (!ret) {
pl08x_release_mux(plchan);
pl08x_free_txd(pl08x, txd);
return NULL;
}
return vchan_tx_prep(&plchan->vc, &txd->vd, flags);
}
static int pl08x_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
if (!plchan->slave)
return -EINVAL;
/* Reject definitely invalid configurations */
if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
return -EINVAL;
if (config->device_fc && pl08x->vd->pl080s) {
dev_err(&pl08x->adev->dev,
"%s: PL080S does not support peripheral flow control\n",
__func__);
return -EINVAL;
}
plchan->cfg = *config;
return 0;
}
static int pl08x_terminate_all(struct dma_chan *chan)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
struct pl08x_driver_data *pl08x = plchan->host;
unsigned long flags;
spin_lock_irqsave(&plchan->vc.lock, flags);
if (!plchan->phychan && !plchan->at) {
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
plchan->state = PL08X_CHAN_IDLE;
if (plchan->phychan) {
/*
* Mark physical channel as free and free any slave
* signal
*/
pl08x_phy_free(plchan);
}
/* Dequeue jobs and free LLIs */
if (plchan->at) {
vchan_terminate_vdesc(&plchan->at->vd);
plchan->at = NULL;
}
/* Dequeue jobs not yet fired as well */
pl08x_free_txd_list(pl08x, plchan);
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
static void pl08x_synchronize(struct dma_chan *chan)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
vchan_synchronize(&plchan->vc);
}
static int pl08x_pause(struct dma_chan *chan)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
unsigned long flags;
/*
* Anything succeeds on channels with no physical allocation and
* no queued transfers.
*/
spin_lock_irqsave(&plchan->vc.lock, flags);
if (!plchan->phychan && !plchan->at) {
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
pl08x_pause_phy_chan(plchan->phychan);
plchan->state = PL08X_CHAN_PAUSED;
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
static int pl08x_resume(struct dma_chan *chan)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
unsigned long flags;
/*
* Anything succeeds on channels with no physical allocation and
* no queued transfers.
*/
spin_lock_irqsave(&plchan->vc.lock, flags);
if (!plchan->phychan && !plchan->at) {
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
pl08x_resume_phy_chan(plchan->phychan);
plchan->state = PL08X_CHAN_RUNNING;
spin_unlock_irqrestore(&plchan->vc.lock, flags);
return 0;
}
bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
{
struct pl08x_dma_chan *plchan;
char *name = chan_id;
/* Reject channels for devices not bound to this driver */
if (chan->device->dev->driver != &pl08x_amba_driver.drv)
return false;
plchan = to_pl08x_chan(chan);
/* Check that the channel is not taken! */
if (!strcmp(plchan->name, name))
return true;
return false;
}
EXPORT_SYMBOL_GPL(pl08x_filter_id);
static bool pl08x_filter_fn(struct dma_chan *chan, void *chan_id)
{
struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
return plchan->cd == chan_id;
}
/*
* Just check that the device is there and active
* TODO: turn this bit on/off depending on the number of physical channels
* actually used, if it is zero... well shut it off. That will save some
* power. Cut the clock at the same time.
*/
static void pl08x_ensure_on(struct pl08x_driver_data *pl08x)
{
/* The Nomadik variant does not have the config register */
if (pl08x->vd->nomadik)
return;
/* The FTDMAC020 variant does this in another register */
if (pl08x->vd->ftdmac020) {
writel(PL080_CONFIG_ENABLE, pl08x->base + FTDMAC020_CSR);
return;
}
writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG);
}
static irqreturn_t pl08x_irq(int irq, void *dev)
{
struct pl08x_driver_data *pl08x = dev;
u32 mask = 0, err, tc, i;
/* check & clear - ERR & TC interrupts */
err = readl(pl08x->base + PL080_ERR_STATUS);
if (err) {
dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n",
__func__, err);
writel(err, pl08x->base + PL080_ERR_CLEAR);
}
tc = readl(pl08x->base + PL080_TC_STATUS);
if (tc)
writel(tc, pl08x->base + PL080_TC_CLEAR);
if (!err && !tc)
return IRQ_NONE;
for (i = 0; i < pl08x->vd->channels; i++) {
if ((BIT(i) & err) || (BIT(i) & tc)) {
/* Locate physical channel */
struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i];
struct pl08x_dma_chan *plchan = phychan->serving;
struct pl08x_txd *tx;
if (!plchan) {
dev_err(&pl08x->adev->dev,
"%s Error TC interrupt on unused channel: 0x%08x\n",
__func__, i);
continue;
}
spin_lock(&plchan->vc.lock);
tx = plchan->at;
if (tx && tx->cyclic) {
vchan_cyclic_callback(&tx->vd);
} else if (tx) {
plchan->at = NULL;
/*
* This descriptor is done, release its mux
* reservation.
*/
pl08x_release_mux(plchan);
tx->done = true;
vchan_cookie_complete(&tx->vd);
/*
* And start the next descriptor (if any),
* otherwise free this channel.
*/
if (vchan_next_desc(&plchan->vc))
pl08x_start_next_txd(plchan);
else
pl08x_phy_free(plchan);
}
spin_unlock(&plchan->vc.lock);
mask |= BIT(i);
}
}
return mask ? IRQ_HANDLED : IRQ_NONE;
}
static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan)
{
chan->slave = true;
chan->name = chan->cd->bus_id;
chan->cfg.src_addr = chan->cd->addr;
chan->cfg.dst_addr = chan->cd->addr;
}
/*
* Initialise the DMAC memcpy/slave channels.
* Make a local wrapper to hold required data
*/
static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
struct dma_device *dmadev, unsigned int channels, bool slave)
{
struct pl08x_dma_chan *chan;
int i;
INIT_LIST_HEAD(&dmadev->channels);
/*
* Register as many memcpy as we have physical channels,
* we won't always be able to use all but the code will have
* to cope with that situation.
*/
for (i = 0; i < channels; i++) {
chan = kzalloc(sizeof(*chan), GFP_KERNEL);
if (!chan)
return -ENOMEM;
chan->host = pl08x;
chan->state = PL08X_CHAN_IDLE;
chan->signal = -1;
if (slave) {
chan->cd = &pl08x->pd->slave_channels[i];
/*
* Some implementations have muxed signals, whereas some
* use a mux in front of the signals and need dynamic
* assignment of signals.
*/
chan->signal = i;
pl08x_dma_slave_init(chan);
} else {
chan->cd = kzalloc(sizeof(*chan->cd), GFP_KERNEL);
if (!chan->cd) {
kfree(chan);
return -ENOMEM;
}
chan->cd->bus_id = "memcpy";
chan->cd->periph_buses = pl08x->pd->mem_buses;
chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
if (!chan->name) {
kfree(chan->cd);
kfree(chan);
return -ENOMEM;
}
}
dev_dbg(&pl08x->adev->dev,
"initialize virtual channel \"%s\"\n",
chan->name);
chan->vc.desc_free = pl08x_desc_free;
vchan_init(&chan->vc, dmadev);
}
dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",
i, slave ? "slave" : "memcpy");
return i;
}
static void pl08x_free_virtual_channels(struct dma_device *dmadev)
{
struct pl08x_dma_chan *chan = NULL;
struct pl08x_dma_chan *next;
list_for_each_entry_safe(chan,
next, &dmadev->channels, vc.chan.device_node) {
list_del(&chan->vc.chan.device_node);
kfree(chan);
}
}
#ifdef CONFIG_DEBUG_FS
static const char *pl08x_state_str(enum pl08x_dma_chan_state state)
{
switch (state) {
case PL08X_CHAN_IDLE:
return "idle";
case PL08X_CHAN_RUNNING:
return "running";
case PL08X_CHAN_PAUSED:
return "paused";
case PL08X_CHAN_WAITING:
return "waiting";
default:
break;
}
return "UNKNOWN STATE";
}
static int pl08x_debugfs_show(struct seq_file *s, void *data)
{
struct pl08x_driver_data *pl08x = s->private;
struct pl08x_dma_chan *chan;
struct pl08x_phy_chan *ch;
unsigned long flags;
int i;
seq_printf(s, "PL08x physical channels:\n");
seq_printf(s, "CHANNEL:\tUSER:\n");
seq_printf(s, "--------\t-----\n");
for (i = 0; i < pl08x->vd->channels; i++) {
struct pl08x_dma_chan *virt_chan;
ch = &pl08x->phy_chans[i];
spin_lock_irqsave(&ch->lock, flags);
virt_chan = ch->serving;
seq_printf(s, "%d\t\t%s%s\n",
ch->id,
virt_chan ? virt_chan->name : "(none)",
ch->locked ? " LOCKED" : "");
spin_unlock_irqrestore(&ch->lock, flags);
}
seq_printf(s, "\nPL08x virtual memcpy channels:\n");
seq_printf(s, "CHANNEL:\tSTATE:\n");
seq_printf(s, "--------\t------\n");
list_for_each_entry(chan, &pl08x->memcpy.channels, vc.chan.device_node) {
seq_printf(s, "%s\t\t%s\n", chan->name,
pl08x_state_str(chan->state));
}
if (pl08x->has_slave) {
seq_printf(s, "\nPL08x virtual slave channels:\n");
seq_printf(s, "CHANNEL:\tSTATE:\n");
seq_printf(s, "--------\t------\n");
list_for_each_entry(chan, &pl08x->slave.channels,
vc.chan.device_node) {
seq_printf(s, "%s\t\t%s\n", chan->name,
pl08x_state_str(chan->state));
}
}
return 0;
}
DEFINE_SHOW_ATTRIBUTE(pl08x_debugfs);
static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
{
/* Expose a simple debugfs interface to view all clocks */
debugfs_create_file(dev_name(&pl08x->adev->dev), S_IFREG | S_IRUGO,
NULL, pl08x, &pl08x_debugfs_fops);
}
#else
static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
{
}
#endif
#ifdef CONFIG_OF
static struct dma_chan *pl08x_find_chan_id(struct pl08x_driver_data *pl08x,
u32 id)
{
struct pl08x_dma_chan *chan;
/* Trying to get a slave channel from something with no slave support */
if (!pl08x->has_slave)
return NULL;
list_for_each_entry(chan, &pl08x->slave.channels, vc.chan.device_node) {
if (chan->signal == id)
return &chan->vc.chan;
}
return NULL;
}
static struct dma_chan *pl08x_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct pl08x_driver_data *pl08x = ofdma->of_dma_data;
struct dma_chan *dma_chan;
struct pl08x_dma_chan *plchan;
if (!pl08x)
return NULL;
if (dma_spec->args_count != 2) {
dev_err(&pl08x->adev->dev,
"DMA channel translation requires two cells\n");
return NULL;
}
dma_chan = pl08x_find_chan_id(pl08x, dma_spec->args[0]);
if (!dma_chan) {
dev_err(&pl08x->adev->dev,
"DMA slave channel not found\n");
return NULL;
}
plchan = to_pl08x_chan(dma_chan);
dev_dbg(&pl08x->adev->dev,
"translated channel for signal %d\n",
dma_spec->args[0]);
/* Augment channel data for applicable AHB buses */
plchan->cd->periph_buses = dma_spec->args[1];
return dma_get_slave_channel(dma_chan);
}
static int pl08x_of_probe(struct amba_device *adev,
struct pl08x_driver_data *pl08x,
struct device_node *np)
{
struct pl08x_platform_data *pd;
struct pl08x_channel_data *chanp = NULL;
u32 val;
int ret;
int i;
pd = devm_kzalloc(&adev->dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
return -ENOMEM;
/* Eligible bus masters for fetching LLIs */
if (of_property_read_bool(np, "lli-bus-interface-ahb1"))
pd->lli_buses |= PL08X_AHB1;
if (of_property_read_bool(np, "lli-bus-interface-ahb2"))
pd->lli_buses |= PL08X_AHB2;
if (!pd->lli_buses) {
dev_info(&adev->dev, "no bus masters for LLIs stated, assume all\n");
pd->lli_buses |= PL08X_AHB1 | PL08X_AHB2;
}
/* Eligible bus masters for memory access */
if (of_property_read_bool(np, "mem-bus-interface-ahb1"))
pd->mem_buses |= PL08X_AHB1;
if (of_property_read_bool(np, "mem-bus-interface-ahb2"))
pd->mem_buses |= PL08X_AHB2;
if (!pd->mem_buses) {
dev_info(&adev->dev, "no bus masters for memory stated, assume all\n");
pd->mem_buses |= PL08X_AHB1 | PL08X_AHB2;
}
/* Parse the memcpy channel properties */
ret = of_property_read_u32(np, "memcpy-burst-size", &val);
if (ret) {
dev_info(&adev->dev, "no memcpy burst size specified, using 1 byte\n");
val = 1;
}
switch (val) {
default:
dev_err(&adev->dev, "illegal burst size for memcpy, set to 1\n");
fallthrough;
case 1:
pd->memcpy_burst_size = PL08X_BURST_SZ_1;
break;
case 4:
pd->memcpy_burst_size = PL08X_BURST_SZ_4;
break;
case 8:
pd->memcpy_burst_size = PL08X_BURST_SZ_8;
break;
case 16:
pd->memcpy_burst_size = PL08X_BURST_SZ_16;
break;
case 32:
pd->memcpy_burst_size = PL08X_BURST_SZ_32;
break;
case 64:
pd->memcpy_burst_size = PL08X_BURST_SZ_64;
break;
case 128:
pd->memcpy_burst_size = PL08X_BURST_SZ_128;
break;
case 256:
pd->memcpy_burst_size = PL08X_BURST_SZ_256;
break;
}
ret = of_property_read_u32(np, "memcpy-bus-width", &val);
if (ret) {
dev_info(&adev->dev, "no memcpy bus width specified, using 8 bits\n");
val = 8;
}
switch (val) {
default:
dev_err(&adev->dev, "illegal bus width for memcpy, set to 8 bits\n");
fallthrough;
case 8:
pd->memcpy_bus_width = PL08X_BUS_WIDTH_8_BITS;
break;
case 16:
pd->memcpy_bus_width = PL08X_BUS_WIDTH_16_BITS;
break;
case 32:
pd->memcpy_bus_width = PL08X_BUS_WIDTH_32_BITS;
break;
}
/*
* Allocate channel data for all possible slave channels (one
* for each possible signal), channels will then be allocated
* for a device and have it's AHB interfaces set up at
* translation time.
*/
if (pl08x->vd->signals) {
chanp = devm_kcalloc(&adev->dev,
pl08x->vd->signals,
sizeof(struct pl08x_channel_data),
GFP_KERNEL);
if (!chanp)
return -ENOMEM;
pd->slave_channels = chanp;
for (i = 0; i < pl08x->vd->signals; i++) {
/*
* chanp->periph_buses will be assigned at translation
*/
chanp->bus_id = kasprintf(GFP_KERNEL, "slave%d", i);
chanp++;
}
pd->num_slave_channels = pl08x->vd->signals;
}
pl08x->pd = pd;
return of_dma_controller_register(adev->dev.of_node, pl08x_of_xlate,
pl08x);
}
#else
static inline int pl08x_of_probe(struct amba_device *adev,
struct pl08x_driver_data *pl08x,
struct device_node *np)
{
return -EINVAL;
}
#endif
static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
{
struct pl08x_driver_data *pl08x;
struct vendor_data *vd = id->data;
struct device_node *np = adev->dev.of_node;
u32 tsfr_size;
int ret = 0;
int i;
ret = amba_request_regions(adev, NULL);
if (ret)
return ret;
/* Ensure that we can do DMA */
ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32));
if (ret)
goto out_no_pl08x;
/* Create the driver state holder */
pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL);
if (!pl08x) {
ret = -ENOMEM;
goto out_no_pl08x;
}
/* Assign useful pointers to the driver state */
pl08x->adev = adev;
pl08x->vd = vd;
pl08x->base = ioremap(adev->res.start, resource_size(&adev->res));
if (!pl08x->base) {
ret = -ENOMEM;
goto out_no_ioremap;
}
if (vd->ftdmac020) {
u32 val;
val = readl(pl08x->base + FTDMAC020_REVISION);
dev_info(&pl08x->adev->dev, "FTDMAC020 %d.%d rel %d\n",
(val >> 16) & 0xff, (val >> 8) & 0xff, val & 0xff);
val = readl(pl08x->base + FTDMAC020_FEATURE);
dev_info(&pl08x->adev->dev, "FTDMAC020 %d channels, "
"%s built-in bridge, %s, %s linked lists\n",
(val >> 12) & 0x0f,
(val & BIT(10)) ? "no" : "has",
(val & BIT(9)) ? "AHB0 and AHB1" : "AHB0",
(val & BIT(8)) ? "supports" : "does not support");
/* Vendor data from feature register */
if (!(val & BIT(8)))
dev_warn(&pl08x->adev->dev,
"linked lists not supported, required\n");
vd->channels = (val >> 12) & 0x0f;
vd->dualmaster = !!(val & BIT(9));
}
/* Initialize memcpy engine */
dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
pl08x->memcpy.dev = &adev->dev;
pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources;
pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy;
pl08x->memcpy.device_tx_status = pl08x_dma_tx_status;
pl08x->memcpy.device_issue_pending = pl08x_issue_pending;
pl08x->memcpy.device_config = pl08x_config;
pl08x->memcpy.device_pause = pl08x_pause;
pl08x->memcpy.device_resume = pl08x_resume;
pl08x->memcpy.device_terminate_all = pl08x_terminate_all;
pl08x->memcpy.device_synchronize = pl08x_synchronize;
pl08x->memcpy.src_addr_widths = PL80X_DMA_BUSWIDTHS;
pl08x->memcpy.dst_addr_widths = PL80X_DMA_BUSWIDTHS;
pl08x->memcpy.directions = BIT(DMA_MEM_TO_MEM);
pl08x->memcpy.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
if (vd->ftdmac020)
pl08x->memcpy.copy_align = DMAENGINE_ALIGN_4_BYTES;
/*
* Initialize slave engine, if the block has no signals, that means
* we have no slave support.
*/
if (vd->signals) {
pl08x->has_slave = true;
dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask);
dma_cap_set(DMA_CYCLIC, pl08x->slave.cap_mask);
pl08x->slave.dev = &adev->dev;
pl08x->slave.device_free_chan_resources =
pl08x_free_chan_resources;
pl08x->slave.device_tx_status = pl08x_dma_tx_status;
pl08x->slave.device_issue_pending = pl08x_issue_pending;
pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg;
pl08x->slave.device_prep_dma_cyclic = pl08x_prep_dma_cyclic;
pl08x->slave.device_config = pl08x_config;
pl08x->slave.device_pause = pl08x_pause;
pl08x->slave.device_resume = pl08x_resume;
pl08x->slave.device_terminate_all = pl08x_terminate_all;
pl08x->slave.device_synchronize = pl08x_synchronize;
pl08x->slave.src_addr_widths = PL80X_DMA_BUSWIDTHS;
pl08x->slave.dst_addr_widths = PL80X_DMA_BUSWIDTHS;
pl08x->slave.directions =
BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
pl08x->slave.residue_granularity =
DMA_RESIDUE_GRANULARITY_SEGMENT;
}
/* Get the platform data */
pl08x->pd = dev_get_platdata(&adev->dev);
if (!pl08x->pd) {
if (np) {
ret = pl08x_of_probe(adev, pl08x, np);
if (ret)
goto out_no_platdata;
} else {
dev_err(&adev->dev, "no platform data supplied\n");
ret = -EINVAL;
goto out_no_platdata;
}
} else {
pl08x->slave.filter.map = pl08x->pd->slave_map;
pl08x->slave.filter.mapcnt = pl08x->pd->slave_map_len;
pl08x->slave.filter.fn = pl08x_filter_fn;
}
/* By default, AHB1 only. If dualmaster, from platform */
pl08x->lli_buses = PL08X_AHB1;
pl08x->mem_buses = PL08X_AHB1;
if (pl08x->vd->dualmaster) {
pl08x->lli_buses = pl08x->pd->lli_buses;
pl08x->mem_buses = pl08x->pd->mem_buses;
}
if (vd->pl080s)
pl08x->lli_words = PL080S_LLI_WORDS;
else
pl08x->lli_words = PL080_LLI_WORDS;
tsfr_size = MAX_NUM_TSFR_LLIS * pl08x->lli_words * sizeof(u32);
/* A DMA memory pool for LLIs, align on 1-byte boundary */
pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev,
tsfr_size, PL08X_ALIGN, 0);
if (!pl08x->pool) {
ret = -ENOMEM;
goto out_no_lli_pool;
}
/* Turn on the PL08x */
pl08x_ensure_on(pl08x);
/* Clear any pending interrupts */
if (vd->ftdmac020)
/* This variant has error IRQs in bits 16-19 */
writel(0x0000FFFF, pl08x->base + PL080_ERR_CLEAR);
else
writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR);
writel(0x000000FF, pl08x->base + PL080_TC_CLEAR);
/* Attach the interrupt handler */
ret = request_irq(adev->irq[0], pl08x_irq, 0, DRIVER_NAME, pl08x);
if (ret) {
dev_err(&adev->dev, "%s failed to request interrupt %d\n",
__func__, adev->irq[0]);
goto out_no_irq;
}
/* Initialize physical channels */
pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)),
GFP_KERNEL);
if (!pl08x->phy_chans) {
ret = -ENOMEM;
goto out_no_phychans;
}
for (i = 0; i < vd->channels; i++) {
struct pl08x_phy_chan *ch = &pl08x->phy_chans[i];
ch->id = i;
ch->base = pl08x->base + PL080_Cx_BASE(i);
if (vd->ftdmac020) {
/* FTDMA020 has a special channel busy register */
ch->reg_busy = ch->base + FTDMAC020_CH_BUSY;
ch->reg_config = ch->base + FTDMAC020_CH_CFG;
ch->reg_control = ch->base + FTDMAC020_CH_CSR;
ch->reg_src = ch->base + FTDMAC020_CH_SRC_ADDR;
ch->reg_dst = ch->base + FTDMAC020_CH_DST_ADDR;
ch->reg_lli = ch->base + FTDMAC020_CH_LLP;
ch->ftdmac020 = true;
} else {
ch->reg_config = ch->base + vd->config_offset;
ch->reg_control = ch->base + PL080_CH_CONTROL;
ch->reg_src = ch->base + PL080_CH_SRC_ADDR;
ch->reg_dst = ch->base + PL080_CH_DST_ADDR;
ch->reg_lli = ch->base + PL080_CH_LLI;
}
if (vd->pl080s)
ch->pl080s = true;
spin_lock_init(&ch->lock);
/*
* Nomadik variants can have channels that are locked
* down for the secure world only. Lock up these channels
* by perpetually serving a dummy virtual channel.
*/
if (vd->nomadik) {
u32 val;
val = readl(ch->reg_config);
if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) {
dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i);
ch->locked = true;
}
}
dev_dbg(&adev->dev, "physical channel %d is %s\n",
i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE");
}
/* Register as many memcpy channels as there are physical channels */
ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy,
pl08x->vd->channels, false);
if (ret <= 0) {
dev_warn(&pl08x->adev->dev,
"%s failed to enumerate memcpy channels - %d\n",
__func__, ret);
goto out_no_memcpy;
}
/* Register slave channels */
if (pl08x->has_slave) {
ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave,
pl08x->pd->num_slave_channels, true);
if (ret < 0) {
dev_warn(&pl08x->adev->dev,
"%s failed to enumerate slave channels - %d\n",
__func__, ret);
goto out_no_slave;
}
}
ret = dma_async_device_register(&pl08x->memcpy);
if (ret) {
dev_warn(&pl08x->adev->dev,
"%s failed to register memcpy as an async device - %d\n",
__func__, ret);
goto out_no_memcpy_reg;
}
if (pl08x->has_slave) {
ret = dma_async_device_register(&pl08x->slave);
if (ret) {
dev_warn(&pl08x->adev->dev,
"%s failed to register slave as an async device - %d\n",
__func__, ret);
goto out_no_slave_reg;
}
}
amba_set_drvdata(adev, pl08x);
init_pl08x_debugfs(pl08x);
dev_info(&pl08x->adev->dev, "DMA: PL%03x%s rev%u at 0x%08llx irq %d\n",
amba_part(adev), pl08x->vd->pl080s ? "s" : "", amba_rev(adev),
(unsigned long long)adev->res.start, adev->irq[0]);
return 0;
out_no_slave_reg:
dma_async_device_unregister(&pl08x->memcpy);
out_no_memcpy_reg:
if (pl08x->has_slave)
pl08x_free_virtual_channels(&pl08x->slave);
out_no_slave:
pl08x_free_virtual_channels(&pl08x->memcpy);
out_no_memcpy:
kfree(pl08x->phy_chans);
out_no_phychans:
free_irq(adev->irq[0], pl08x);
out_no_irq:
dma_pool_destroy(pl08x->pool);
out_no_lli_pool:
out_no_platdata:
iounmap(pl08x->base);
out_no_ioremap:
kfree(pl08x);
out_no_pl08x:
amba_release_regions(adev);
return ret;
}
/* PL080 has 8 channels and the PL080 have just 2 */
static struct vendor_data vendor_pl080 = {
.config_offset = PL080_CH_CONFIG,
.channels = 8,
.signals = 16,
.dualmaster = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_nomadik = {
.config_offset = PL080_CH_CONFIG,
.channels = 8,
.signals = 32,
.dualmaster = true,
.nomadik = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_pl080s = {
.config_offset = PL080S_CH_CONFIG,
.channels = 8,
.signals = 32,
.pl080s = true,
.max_transfer_size = PL080S_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_pl081 = {
.config_offset = PL080_CH_CONFIG,
.channels = 2,
.signals = 16,
.dualmaster = false,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static struct vendor_data vendor_ftdmac020 = {
.config_offset = PL080_CH_CONFIG,
.ftdmac020 = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
static const struct amba_id pl08x_ids[] = {
/* Samsung PL080S variant */
{
.id = 0x0a141080,
.mask = 0xffffffff,
.data = &vendor_pl080s,
},
/* PL080 */
{
.id = 0x00041080,
.mask = 0x000fffff,
.data = &vendor_pl080,
},
/* PL081 */
{
.id = 0x00041081,
.mask = 0x000fffff,
.data = &vendor_pl081,
},
/* Nomadik 8815 PL080 variant */
{
.id = 0x00280080,
.mask = 0x00ffffff,
.data = &vendor_nomadik,
},
/* Faraday Technology FTDMAC020 */
{
.id = 0x0003b080,
.mask = 0x000fffff,
.data = &vendor_ftdmac020,
},
{ 0, 0 },
};
MODULE_DEVICE_TABLE(amba, pl08x_ids);
static struct amba_driver pl08x_amba_driver = {
.drv.name = DRIVER_NAME,
.id_table = pl08x_ids,
.probe = pl08x_probe,
};
static int __init pl08x_init(void)
{
int retval;
retval = amba_driver_register(&pl08x_amba_driver);
if (retval)
printk(KERN_WARNING DRIVER_NAME
"failed to register as an AMBA device (%d)\n",
retval);
return retval;
}
subsys_initcall(pl08x_init);
| linux-master | drivers/dma/amba-pl08x.c |
// SPDX-License-Identifier: GPL-2.0+
//
// Copyright (c) 2013-2014 Freescale Semiconductor, Inc
// Copyright (c) 2017 Sysam, Angelo Dureghello <[email protected]>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/platform_device.h>
#include <linux/platform_data/dma-mcf-edma.h>
#include "fsl-edma-common.h"
#define EDMA_CHANNELS 64
#define EDMA_MASK_CH(x) ((x) & GENMASK(5, 0))
static irqreturn_t mcf_edma_tx_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *mcf_edma = dev_id;
struct edma_regs *regs = &mcf_edma->regs;
unsigned int ch;
u64 intmap;
intmap = ioread32(regs->inth);
intmap <<= 32;
intmap |= ioread32(regs->intl);
if (!intmap)
return IRQ_NONE;
for (ch = 0; ch < mcf_edma->n_chans; ch++) {
if (intmap & BIT(ch)) {
iowrite8(EDMA_MASK_CH(ch), regs->cint);
fsl_edma_tx_chan_handler(&mcf_edma->chans[ch]);
}
}
return IRQ_HANDLED;
}
static irqreturn_t mcf_edma_err_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *mcf_edma = dev_id;
struct edma_regs *regs = &mcf_edma->regs;
unsigned int err, ch;
err = ioread32(regs->errl);
if (!err)
return IRQ_NONE;
for (ch = 0; ch < (EDMA_CHANNELS / 2); ch++) {
if (err & BIT(ch)) {
fsl_edma_disable_request(&mcf_edma->chans[ch]);
iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
fsl_edma_err_chan_handler(&mcf_edma->chans[ch]);
}
}
err = ioread32(regs->errh);
if (!err)
return IRQ_NONE;
for (ch = (EDMA_CHANNELS / 2); ch < EDMA_CHANNELS; ch++) {
if (err & (BIT(ch - (EDMA_CHANNELS / 2)))) {
fsl_edma_disable_request(&mcf_edma->chans[ch]);
iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
mcf_edma->chans[ch].status = DMA_ERROR;
mcf_edma->chans[ch].idle = true;
}
}
return IRQ_HANDLED;
}
static int mcf_edma_irq_init(struct platform_device *pdev,
struct fsl_edma_engine *mcf_edma)
{
int ret = 0, i;
struct resource *res;
res = platform_get_resource_byname(pdev,
IORESOURCE_IRQ, "edma-tx-00-15");
if (!res)
return -1;
for (ret = 0, i = res->start; i <= res->end; ++i)
ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
if (ret)
return ret;
res = platform_get_resource_byname(pdev,
IORESOURCE_IRQ, "edma-tx-16-55");
if (!res)
return -1;
for (ret = 0, i = res->start; i <= res->end; ++i)
ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
if (ret)
return ret;
ret = platform_get_irq_byname(pdev, "edma-tx-56-63");
if (ret != -ENXIO) {
ret = request_irq(ret, mcf_edma_tx_handler,
0, "eDMA", mcf_edma);
if (ret)
return ret;
}
ret = platform_get_irq_byname(pdev, "edma-err");
if (ret != -ENXIO) {
ret = request_irq(ret, mcf_edma_err_handler,
0, "eDMA", mcf_edma);
if (ret)
return ret;
}
return 0;
}
static void mcf_edma_irq_free(struct platform_device *pdev,
struct fsl_edma_engine *mcf_edma)
{
int irq;
struct resource *res;
res = platform_get_resource_byname(pdev,
IORESOURCE_IRQ, "edma-tx-00-15");
if (res) {
for (irq = res->start; irq <= res->end; irq++)
free_irq(irq, mcf_edma);
}
res = platform_get_resource_byname(pdev,
IORESOURCE_IRQ, "edma-tx-16-55");
if (res) {
for (irq = res->start; irq <= res->end; irq++)
free_irq(irq, mcf_edma);
}
irq = platform_get_irq_byname(pdev, "edma-tx-56-63");
if (irq != -ENXIO)
free_irq(irq, mcf_edma);
irq = platform_get_irq_byname(pdev, "edma-err");
if (irq != -ENXIO)
free_irq(irq, mcf_edma);
}
static struct fsl_edma_drvdata mcf_data = {
.flags = FSL_EDMA_DRV_EDMA64,
.setup_irq = mcf_edma_irq_init,
};
static int mcf_edma_probe(struct platform_device *pdev)
{
struct mcf_edma_platform_data *pdata;
struct fsl_edma_engine *mcf_edma;
struct edma_regs *regs;
int ret, i, chans;
pdata = dev_get_platdata(&pdev->dev);
if (!pdata) {
dev_err(&pdev->dev, "no platform data supplied\n");
return -EINVAL;
}
if (!pdata->dma_channels) {
dev_info(&pdev->dev, "setting default channel number to 64");
chans = 64;
} else {
chans = pdata->dma_channels;
}
mcf_edma = devm_kzalloc(&pdev->dev, struct_size(mcf_edma, chans, chans),
GFP_KERNEL);
if (!mcf_edma)
return -ENOMEM;
mcf_edma->n_chans = chans;
/* Set up drvdata for ColdFire edma */
mcf_edma->drvdata = &mcf_data;
mcf_edma->big_endian = 1;
mutex_init(&mcf_edma->fsl_edma_mutex);
mcf_edma->membase = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mcf_edma->membase))
return PTR_ERR(mcf_edma->membase);
fsl_edma_setup_regs(mcf_edma);
regs = &mcf_edma->regs;
INIT_LIST_HEAD(&mcf_edma->dma_dev.channels);
for (i = 0; i < mcf_edma->n_chans; i++) {
struct fsl_edma_chan *mcf_chan = &mcf_edma->chans[i];
mcf_chan->edma = mcf_edma;
mcf_chan->slave_id = i;
mcf_chan->idle = true;
mcf_chan->dma_dir = DMA_NONE;
mcf_chan->vchan.desc_free = fsl_edma_free_desc;
vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev);
mcf_chan->tcd = mcf_edma->membase + EDMA_TCD
+ i * sizeof(struct fsl_edma_hw_tcd);
iowrite32(0x0, &mcf_chan->tcd->csr);
}
iowrite32(~0, regs->inth);
iowrite32(~0, regs->intl);
ret = mcf_edma->drvdata->setup_irq(pdev, mcf_edma);
if (ret)
return ret;
dma_cap_set(DMA_PRIVATE, mcf_edma->dma_dev.cap_mask);
dma_cap_set(DMA_SLAVE, mcf_edma->dma_dev.cap_mask);
dma_cap_set(DMA_CYCLIC, mcf_edma->dma_dev.cap_mask);
mcf_edma->dma_dev.dev = &pdev->dev;
mcf_edma->dma_dev.device_alloc_chan_resources =
fsl_edma_alloc_chan_resources;
mcf_edma->dma_dev.device_free_chan_resources =
fsl_edma_free_chan_resources;
mcf_edma->dma_dev.device_config = fsl_edma_slave_config;
mcf_edma->dma_dev.device_prep_dma_cyclic =
fsl_edma_prep_dma_cyclic;
mcf_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
mcf_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
mcf_edma->dma_dev.device_pause = fsl_edma_pause;
mcf_edma->dma_dev.device_resume = fsl_edma_resume;
mcf_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
mcf_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
mcf_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
mcf_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
mcf_edma->dma_dev.directions =
BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
mcf_edma->dma_dev.filter.fn = mcf_edma_filter_fn;
mcf_edma->dma_dev.filter.map = pdata->slave_map;
mcf_edma->dma_dev.filter.mapcnt = pdata->slavecnt;
platform_set_drvdata(pdev, mcf_edma);
ret = dma_async_device_register(&mcf_edma->dma_dev);
if (ret) {
dev_err(&pdev->dev,
"Can't register Freescale eDMA engine. (%d)\n", ret);
return ret;
}
/* Enable round robin arbitration */
iowrite32(EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
return 0;
}
static int mcf_edma_remove(struct platform_device *pdev)
{
struct fsl_edma_engine *mcf_edma = platform_get_drvdata(pdev);
mcf_edma_irq_free(pdev, mcf_edma);
fsl_edma_cleanup_vchan(&mcf_edma->dma_dev);
dma_async_device_unregister(&mcf_edma->dma_dev);
return 0;
}
static struct platform_driver mcf_edma_driver = {
.driver = {
.name = "mcf-edma",
},
.probe = mcf_edma_probe,
.remove = mcf_edma_remove,
};
bool mcf_edma_filter_fn(struct dma_chan *chan, void *param)
{
if (chan->device->dev->driver == &mcf_edma_driver.driver) {
struct fsl_edma_chan *mcf_chan = to_fsl_edma_chan(chan);
return (mcf_chan->slave_id == (uintptr_t)param);
}
return false;
}
EXPORT_SYMBOL(mcf_edma_filter_fn);
static int __init mcf_edma_init(void)
{
return platform_driver_register(&mcf_edma_driver);
}
subsys_initcall(mcf_edma_init);
static void __exit mcf_edma_exit(void)
{
platform_driver_unregister(&mcf_edma_driver);
}
module_exit(mcf_edma_exit);
MODULE_ALIAS("platform:mcf-edma");
MODULE_DESCRIPTION("Freescale eDMA engine driver, ColdFire family");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/mcf-edma-main.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2013 - 2015 Linaro Ltd.
* Copyright (c) 2013 HiSilicon Limited.
*/
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/dmaengine.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/clk.h>
#include <linux/of_dma.h>
#include "virt-dma.h"
#define DRIVER_NAME "k3-dma"
#define DMA_MAX_SIZE 0x1ffc
#define DMA_CYCLIC_MAX_PERIOD 0x1000
#define LLI_BLOCK_SIZE (4 * PAGE_SIZE)
#define INT_STAT 0x00
#define INT_TC1 0x04
#define INT_TC2 0x08
#define INT_ERR1 0x0c
#define INT_ERR2 0x10
#define INT_TC1_MASK 0x18
#define INT_TC2_MASK 0x1c
#define INT_ERR1_MASK 0x20
#define INT_ERR2_MASK 0x24
#define INT_TC1_RAW 0x600
#define INT_TC2_RAW 0x608
#define INT_ERR1_RAW 0x610
#define INT_ERR2_RAW 0x618
#define CH_PRI 0x688
#define CH_STAT 0x690
#define CX_CUR_CNT 0x704
#define CX_LLI 0x800
#define CX_CNT1 0x80c
#define CX_CNT0 0x810
#define CX_SRC 0x814
#define CX_DST 0x818
#define CX_CFG 0x81c
#define CX_LLI_CHAIN_EN 0x2
#define CX_CFG_EN 0x1
#define CX_CFG_NODEIRQ BIT(1)
#define CX_CFG_MEM2PER (0x1 << 2)
#define CX_CFG_PER2MEM (0x2 << 2)
#define CX_CFG_SRCINCR (0x1 << 31)
#define CX_CFG_DSTINCR (0x1 << 30)
struct k3_desc_hw {
u32 lli;
u32 reserved[3];
u32 count;
u32 saddr;
u32 daddr;
u32 config;
} __aligned(32);
struct k3_dma_desc_sw {
struct virt_dma_desc vd;
dma_addr_t desc_hw_lli;
size_t desc_num;
size_t size;
struct k3_desc_hw *desc_hw;
};
struct k3_dma_phy;
struct k3_dma_chan {
u32 ccfg;
struct virt_dma_chan vc;
struct k3_dma_phy *phy;
struct list_head node;
dma_addr_t dev_addr;
enum dma_status status;
bool cyclic;
struct dma_slave_config slave_config;
};
struct k3_dma_phy {
u32 idx;
void __iomem *base;
struct k3_dma_chan *vchan;
struct k3_dma_desc_sw *ds_run;
struct k3_dma_desc_sw *ds_done;
};
struct k3_dma_dev {
struct dma_device slave;
void __iomem *base;
struct tasklet_struct task;
spinlock_t lock;
struct list_head chan_pending;
struct k3_dma_phy *phy;
struct k3_dma_chan *chans;
struct clk *clk;
struct dma_pool *pool;
u32 dma_channels;
u32 dma_requests;
u32 dma_channel_mask;
unsigned int irq;
};
#define K3_FLAG_NOCLK BIT(1)
struct k3dma_soc_data {
unsigned long flags;
};
#define to_k3_dma(dmadev) container_of(dmadev, struct k3_dma_dev, slave)
static int k3_dma_config_write(struct dma_chan *chan,
enum dma_transfer_direction dir,
struct dma_slave_config *cfg);
static struct k3_dma_chan *to_k3_chan(struct dma_chan *chan)
{
return container_of(chan, struct k3_dma_chan, vc.chan);
}
static void k3_dma_pause_dma(struct k3_dma_phy *phy, bool on)
{
u32 val = 0;
if (on) {
val = readl_relaxed(phy->base + CX_CFG);
val |= CX_CFG_EN;
writel_relaxed(val, phy->base + CX_CFG);
} else {
val = readl_relaxed(phy->base + CX_CFG);
val &= ~CX_CFG_EN;
writel_relaxed(val, phy->base + CX_CFG);
}
}
static void k3_dma_terminate_chan(struct k3_dma_phy *phy, struct k3_dma_dev *d)
{
u32 val = 0;
k3_dma_pause_dma(phy, false);
val = 0x1 << phy->idx;
writel_relaxed(val, d->base + INT_TC1_RAW);
writel_relaxed(val, d->base + INT_TC2_RAW);
writel_relaxed(val, d->base + INT_ERR1_RAW);
writel_relaxed(val, d->base + INT_ERR2_RAW);
}
static void k3_dma_set_desc(struct k3_dma_phy *phy, struct k3_desc_hw *hw)
{
writel_relaxed(hw->lli, phy->base + CX_LLI);
writel_relaxed(hw->count, phy->base + CX_CNT0);
writel_relaxed(hw->saddr, phy->base + CX_SRC);
writel_relaxed(hw->daddr, phy->base + CX_DST);
writel_relaxed(hw->config, phy->base + CX_CFG);
}
static u32 k3_dma_get_curr_cnt(struct k3_dma_dev *d, struct k3_dma_phy *phy)
{
u32 cnt = 0;
cnt = readl_relaxed(d->base + CX_CUR_CNT + phy->idx * 0x10);
cnt &= 0xffff;
return cnt;
}
static u32 k3_dma_get_curr_lli(struct k3_dma_phy *phy)
{
return readl_relaxed(phy->base + CX_LLI);
}
static u32 k3_dma_get_chan_stat(struct k3_dma_dev *d)
{
return readl_relaxed(d->base + CH_STAT);
}
static void k3_dma_enable_dma(struct k3_dma_dev *d, bool on)
{
if (on) {
/* set same priority */
writel_relaxed(0x0, d->base + CH_PRI);
/* unmask irq */
writel_relaxed(0xffff, d->base + INT_TC1_MASK);
writel_relaxed(0xffff, d->base + INT_TC2_MASK);
writel_relaxed(0xffff, d->base + INT_ERR1_MASK);
writel_relaxed(0xffff, d->base + INT_ERR2_MASK);
} else {
/* mask irq */
writel_relaxed(0x0, d->base + INT_TC1_MASK);
writel_relaxed(0x0, d->base + INT_TC2_MASK);
writel_relaxed(0x0, d->base + INT_ERR1_MASK);
writel_relaxed(0x0, d->base + INT_ERR2_MASK);
}
}
static irqreturn_t k3_dma_int_handler(int irq, void *dev_id)
{
struct k3_dma_dev *d = (struct k3_dma_dev *)dev_id;
struct k3_dma_phy *p;
struct k3_dma_chan *c;
u32 stat = readl_relaxed(d->base + INT_STAT);
u32 tc1 = readl_relaxed(d->base + INT_TC1);
u32 tc2 = readl_relaxed(d->base + INT_TC2);
u32 err1 = readl_relaxed(d->base + INT_ERR1);
u32 err2 = readl_relaxed(d->base + INT_ERR2);
u32 i, irq_chan = 0;
while (stat) {
i = __ffs(stat);
stat &= ~BIT(i);
if (likely(tc1 & BIT(i)) || (tc2 & BIT(i))) {
p = &d->phy[i];
c = p->vchan;
if (c && (tc1 & BIT(i))) {
spin_lock(&c->vc.lock);
if (p->ds_run != NULL) {
vchan_cookie_complete(&p->ds_run->vd);
p->ds_done = p->ds_run;
p->ds_run = NULL;
}
spin_unlock(&c->vc.lock);
}
if (c && (tc2 & BIT(i))) {
spin_lock(&c->vc.lock);
if (p->ds_run != NULL)
vchan_cyclic_callback(&p->ds_run->vd);
spin_unlock(&c->vc.lock);
}
irq_chan |= BIT(i);
}
if (unlikely((err1 & BIT(i)) || (err2 & BIT(i))))
dev_warn(d->slave.dev, "DMA ERR\n");
}
writel_relaxed(irq_chan, d->base + INT_TC1_RAW);
writel_relaxed(irq_chan, d->base + INT_TC2_RAW);
writel_relaxed(err1, d->base + INT_ERR1_RAW);
writel_relaxed(err2, d->base + INT_ERR2_RAW);
if (irq_chan)
tasklet_schedule(&d->task);
if (irq_chan || err1 || err2)
return IRQ_HANDLED;
return IRQ_NONE;
}
static int k3_dma_start_txd(struct k3_dma_chan *c)
{
struct k3_dma_dev *d = to_k3_dma(c->vc.chan.device);
struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
if (!c->phy)
return -EAGAIN;
if (BIT(c->phy->idx) & k3_dma_get_chan_stat(d))
return -EAGAIN;
/* Avoid losing track of ds_run if a transaction is in flight */
if (c->phy->ds_run)
return -EAGAIN;
if (vd) {
struct k3_dma_desc_sw *ds =
container_of(vd, struct k3_dma_desc_sw, vd);
/*
* fetch and remove request from vc->desc_issued
* so vc->desc_issued only contains desc pending
*/
list_del(&ds->vd.node);
c->phy->ds_run = ds;
c->phy->ds_done = NULL;
/* start dma */
k3_dma_set_desc(c->phy, &ds->desc_hw[0]);
return 0;
}
c->phy->ds_run = NULL;
c->phy->ds_done = NULL;
return -EAGAIN;
}
static void k3_dma_tasklet(struct tasklet_struct *t)
{
struct k3_dma_dev *d = from_tasklet(d, t, task);
struct k3_dma_phy *p;
struct k3_dma_chan *c, *cn;
unsigned pch, pch_alloc = 0;
/* check new dma request of running channel in vc->desc_issued */
list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
spin_lock_irq(&c->vc.lock);
p = c->phy;
if (p && p->ds_done) {
if (k3_dma_start_txd(c)) {
/* No current txd associated with this channel */
dev_dbg(d->slave.dev, "pchan %u: free\n", p->idx);
/* Mark this channel free */
c->phy = NULL;
p->vchan = NULL;
}
}
spin_unlock_irq(&c->vc.lock);
}
/* check new channel request in d->chan_pending */
spin_lock_irq(&d->lock);
for (pch = 0; pch < d->dma_channels; pch++) {
if (!(d->dma_channel_mask & (1 << pch)))
continue;
p = &d->phy[pch];
if (p->vchan == NULL && !list_empty(&d->chan_pending)) {
c = list_first_entry(&d->chan_pending,
struct k3_dma_chan, node);
/* remove from d->chan_pending */
list_del_init(&c->node);
pch_alloc |= 1 << pch;
/* Mark this channel allocated */
p->vchan = c;
c->phy = p;
dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc);
}
}
spin_unlock_irq(&d->lock);
for (pch = 0; pch < d->dma_channels; pch++) {
if (!(d->dma_channel_mask & (1 << pch)))
continue;
if (pch_alloc & (1 << pch)) {
p = &d->phy[pch];
c = p->vchan;
if (c) {
spin_lock_irq(&c->vc.lock);
k3_dma_start_txd(c);
spin_unlock_irq(&c->vc.lock);
}
}
}
}
static void k3_dma_free_chan_resources(struct dma_chan *chan)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_dev *d = to_k3_dma(chan->device);
unsigned long flags;
spin_lock_irqsave(&d->lock, flags);
list_del_init(&c->node);
spin_unlock_irqrestore(&d->lock, flags);
vchan_free_chan_resources(&c->vc);
c->ccfg = 0;
}
static enum dma_status k3_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *state)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_dev *d = to_k3_dma(chan->device);
struct k3_dma_phy *p;
struct virt_dma_desc *vd;
unsigned long flags;
enum dma_status ret;
size_t bytes = 0;
ret = dma_cookie_status(&c->vc.chan, cookie, state);
if (ret == DMA_COMPLETE)
return ret;
spin_lock_irqsave(&c->vc.lock, flags);
p = c->phy;
ret = c->status;
/*
* If the cookie is on our issue queue, then the residue is
* its total size.
*/
vd = vchan_find_desc(&c->vc, cookie);
if (vd && !c->cyclic) {
bytes = container_of(vd, struct k3_dma_desc_sw, vd)->size;
} else if ((!p) || (!p->ds_run)) {
bytes = 0;
} else {
struct k3_dma_desc_sw *ds = p->ds_run;
u32 clli = 0, index = 0;
bytes = k3_dma_get_curr_cnt(d, p);
clli = k3_dma_get_curr_lli(p);
index = ((clli - ds->desc_hw_lli) /
sizeof(struct k3_desc_hw)) + 1;
for (; index < ds->desc_num; index++) {
bytes += ds->desc_hw[index].count;
/* end of lli */
if (!ds->desc_hw[index].lli)
break;
}
}
spin_unlock_irqrestore(&c->vc.lock, flags);
dma_set_residue(state, bytes);
return ret;
}
static void k3_dma_issue_pending(struct dma_chan *chan)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_dev *d = to_k3_dma(chan->device);
unsigned long flags;
spin_lock_irqsave(&c->vc.lock, flags);
/* add request to vc->desc_issued */
if (vchan_issue_pending(&c->vc)) {
spin_lock(&d->lock);
if (!c->phy) {
if (list_empty(&c->node)) {
/* if new channel, add chan_pending */
list_add_tail(&c->node, &d->chan_pending);
/* check in tasklet */
tasklet_schedule(&d->task);
dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc);
}
}
spin_unlock(&d->lock);
} else
dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc);
spin_unlock_irqrestore(&c->vc.lock, flags);
}
static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst,
dma_addr_t src, size_t len, u32 num, u32 ccfg)
{
if (num != ds->desc_num - 1)
ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) *
sizeof(struct k3_desc_hw);
ds->desc_hw[num].lli |= CX_LLI_CHAIN_EN;
ds->desc_hw[num].count = len;
ds->desc_hw[num].saddr = src;
ds->desc_hw[num].daddr = dst;
ds->desc_hw[num].config = ccfg;
}
static struct k3_dma_desc_sw *k3_dma_alloc_desc_resource(int num,
struct dma_chan *chan)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_desc_sw *ds;
struct k3_dma_dev *d = to_k3_dma(chan->device);
int lli_limit = LLI_BLOCK_SIZE / sizeof(struct k3_desc_hw);
if (num > lli_limit) {
dev_dbg(chan->device->dev, "vch %p: sg num %d exceed max %d\n",
&c->vc, num, lli_limit);
return NULL;
}
ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
if (!ds)
return NULL;
ds->desc_hw = dma_pool_zalloc(d->pool, GFP_NOWAIT, &ds->desc_hw_lli);
if (!ds->desc_hw) {
dev_dbg(chan->device->dev, "vch %p: dma alloc fail\n", &c->vc);
kfree(ds);
return NULL;
}
ds->desc_num = num;
return ds;
}
static struct dma_async_tx_descriptor *k3_dma_prep_memcpy(
struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_desc_sw *ds;
size_t copy = 0;
int num = 0;
if (!len)
return NULL;
num = DIV_ROUND_UP(len, DMA_MAX_SIZE);
ds = k3_dma_alloc_desc_resource(num, chan);
if (!ds)
return NULL;
c->cyclic = 0;
ds->size = len;
num = 0;
if (!c->ccfg) {
/* default is memtomem, without calling device_config */
c->ccfg = CX_CFG_SRCINCR | CX_CFG_DSTINCR | CX_CFG_EN;
c->ccfg |= (0xf << 20) | (0xf << 24); /* burst = 16 */
c->ccfg |= (0x3 << 12) | (0x3 << 16); /* width = 64 bit */
}
do {
copy = min_t(size_t, len, DMA_MAX_SIZE);
k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg);
src += copy;
dst += copy;
len -= copy;
} while (len);
ds->desc_hw[num-1].lli = 0; /* end of link */
return vchan_tx_prep(&c->vc, &ds->vd, flags);
}
static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen,
enum dma_transfer_direction dir, unsigned long flags, void *context)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_desc_sw *ds;
size_t len, avail, total = 0;
struct scatterlist *sg;
dma_addr_t addr, src = 0, dst = 0;
int num = sglen, i;
if (sgl == NULL)
return NULL;
c->cyclic = 0;
for_each_sg(sgl, sg, sglen, i) {
avail = sg_dma_len(sg);
if (avail > DMA_MAX_SIZE)
num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
}
ds = k3_dma_alloc_desc_resource(num, chan);
if (!ds)
return NULL;
num = 0;
k3_dma_config_write(chan, dir, &c->slave_config);
for_each_sg(sgl, sg, sglen, i) {
addr = sg_dma_address(sg);
avail = sg_dma_len(sg);
total += avail;
do {
len = min_t(size_t, avail, DMA_MAX_SIZE);
if (dir == DMA_MEM_TO_DEV) {
src = addr;
dst = c->dev_addr;
} else if (dir == DMA_DEV_TO_MEM) {
src = c->dev_addr;
dst = addr;
}
k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg);
addr += len;
avail -= len;
} while (avail);
}
ds->desc_hw[num-1].lli = 0; /* end of link */
ds->size = total;
return vchan_tx_prep(&c->vc, &ds->vd, flags);
}
static struct dma_async_tx_descriptor *
k3_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
size_t buf_len, size_t period_len,
enum dma_transfer_direction dir,
unsigned long flags)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_desc_sw *ds;
size_t len, avail, total = 0;
dma_addr_t addr, src = 0, dst = 0;
int num = 1, since = 0;
size_t modulo = DMA_CYCLIC_MAX_PERIOD;
u32 en_tc2 = 0;
dev_dbg(chan->device->dev, "%s: buf %pad, dst %pad, buf len %zu, period_len = %zu, dir %d\n",
__func__, &buf_addr, &to_k3_chan(chan)->dev_addr,
buf_len, period_len, (int)dir);
avail = buf_len;
if (avail > modulo)
num += DIV_ROUND_UP(avail, modulo) - 1;
ds = k3_dma_alloc_desc_resource(num, chan);
if (!ds)
return NULL;
c->cyclic = 1;
addr = buf_addr;
avail = buf_len;
total = avail;
num = 0;
k3_dma_config_write(chan, dir, &c->slave_config);
if (period_len < modulo)
modulo = period_len;
do {
len = min_t(size_t, avail, modulo);
if (dir == DMA_MEM_TO_DEV) {
src = addr;
dst = c->dev_addr;
} else if (dir == DMA_DEV_TO_MEM) {
src = c->dev_addr;
dst = addr;
}
since += len;
if (since >= period_len) {
/* descriptor asks for TC2 interrupt on completion */
en_tc2 = CX_CFG_NODEIRQ;
since -= period_len;
} else
en_tc2 = 0;
k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg | en_tc2);
addr += len;
avail -= len;
} while (avail);
/* "Cyclic" == end of link points back to start of link */
ds->desc_hw[num - 1].lli |= ds->desc_hw_lli;
ds->size = total;
return vchan_tx_prep(&c->vc, &ds->vd, flags);
}
static int k3_dma_config(struct dma_chan *chan,
struct dma_slave_config *cfg)
{
struct k3_dma_chan *c = to_k3_chan(chan);
memcpy(&c->slave_config, cfg, sizeof(*cfg));
return 0;
}
static int k3_dma_config_write(struct dma_chan *chan,
enum dma_transfer_direction dir,
struct dma_slave_config *cfg)
{
struct k3_dma_chan *c = to_k3_chan(chan);
u32 maxburst = 0, val = 0;
enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
if (dir == DMA_DEV_TO_MEM) {
c->ccfg = CX_CFG_DSTINCR;
c->dev_addr = cfg->src_addr;
maxburst = cfg->src_maxburst;
width = cfg->src_addr_width;
} else if (dir == DMA_MEM_TO_DEV) {
c->ccfg = CX_CFG_SRCINCR;
c->dev_addr = cfg->dst_addr;
maxburst = cfg->dst_maxburst;
width = cfg->dst_addr_width;
}
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
case DMA_SLAVE_BUSWIDTH_2_BYTES:
case DMA_SLAVE_BUSWIDTH_4_BYTES:
case DMA_SLAVE_BUSWIDTH_8_BYTES:
val = __ffs(width);
break;
default:
val = 3;
break;
}
c->ccfg |= (val << 12) | (val << 16);
if ((maxburst == 0) || (maxburst > 16))
val = 15;
else
val = maxburst - 1;
c->ccfg |= (val << 20) | (val << 24);
c->ccfg |= CX_CFG_MEM2PER | CX_CFG_EN;
/* specific request line */
c->ccfg |= c->vc.chan.chan_id << 4;
return 0;
}
static void k3_dma_free_desc(struct virt_dma_desc *vd)
{
struct k3_dma_desc_sw *ds =
container_of(vd, struct k3_dma_desc_sw, vd);
struct k3_dma_dev *d = to_k3_dma(vd->tx.chan->device);
dma_pool_free(d->pool, ds->desc_hw, ds->desc_hw_lli);
kfree(ds);
}
static int k3_dma_terminate_all(struct dma_chan *chan)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_dev *d = to_k3_dma(chan->device);
struct k3_dma_phy *p = c->phy;
unsigned long flags;
LIST_HEAD(head);
dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc);
/* Prevent this channel being scheduled */
spin_lock(&d->lock);
list_del_init(&c->node);
spin_unlock(&d->lock);
/* Clear the tx descriptor lists */
spin_lock_irqsave(&c->vc.lock, flags);
vchan_get_all_descriptors(&c->vc, &head);
if (p) {
/* vchan is assigned to a pchan - stop the channel */
k3_dma_terminate_chan(p, d);
c->phy = NULL;
p->vchan = NULL;
if (p->ds_run) {
vchan_terminate_vdesc(&p->ds_run->vd);
p->ds_run = NULL;
}
p->ds_done = NULL;
}
spin_unlock_irqrestore(&c->vc.lock, flags);
vchan_dma_desc_free_list(&c->vc, &head);
return 0;
}
static void k3_dma_synchronize(struct dma_chan *chan)
{
struct k3_dma_chan *c = to_k3_chan(chan);
vchan_synchronize(&c->vc);
}
static int k3_dma_transfer_pause(struct dma_chan *chan)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_dev *d = to_k3_dma(chan->device);
struct k3_dma_phy *p = c->phy;
dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc);
if (c->status == DMA_IN_PROGRESS) {
c->status = DMA_PAUSED;
if (p) {
k3_dma_pause_dma(p, false);
} else {
spin_lock(&d->lock);
list_del_init(&c->node);
spin_unlock(&d->lock);
}
}
return 0;
}
static int k3_dma_transfer_resume(struct dma_chan *chan)
{
struct k3_dma_chan *c = to_k3_chan(chan);
struct k3_dma_dev *d = to_k3_dma(chan->device);
struct k3_dma_phy *p = c->phy;
unsigned long flags;
dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc);
spin_lock_irqsave(&c->vc.lock, flags);
if (c->status == DMA_PAUSED) {
c->status = DMA_IN_PROGRESS;
if (p) {
k3_dma_pause_dma(p, true);
} else if (!list_empty(&c->vc.desc_issued)) {
spin_lock(&d->lock);
list_add_tail(&c->node, &d->chan_pending);
spin_unlock(&d->lock);
}
}
spin_unlock_irqrestore(&c->vc.lock, flags);
return 0;
}
static const struct k3dma_soc_data k3_v1_dma_data = {
.flags = 0,
};
static const struct k3dma_soc_data asp_v1_dma_data = {
.flags = K3_FLAG_NOCLK,
};
static const struct of_device_id k3_pdma_dt_ids[] = {
{ .compatible = "hisilicon,k3-dma-1.0",
.data = &k3_v1_dma_data
},
{ .compatible = "hisilicon,hisi-pcm-asp-dma-1.0",
.data = &asp_v1_dma_data
},
{}
};
MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids);
static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct k3_dma_dev *d = ofdma->of_dma_data;
unsigned int request = dma_spec->args[0];
if (request >= d->dma_requests)
return NULL;
return dma_get_slave_channel(&(d->chans[request].vc.chan));
}
static int k3_dma_probe(struct platform_device *op)
{
const struct k3dma_soc_data *soc_data;
struct k3_dma_dev *d;
const struct of_device_id *of_id;
int i, ret, irq = 0;
d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL);
if (!d)
return -ENOMEM;
soc_data = device_get_match_data(&op->dev);
if (!soc_data)
return -EINVAL;
d->base = devm_platform_ioremap_resource(op, 0);
if (IS_ERR(d->base))
return PTR_ERR(d->base);
of_id = of_match_device(k3_pdma_dt_ids, &op->dev);
if (of_id) {
of_property_read_u32((&op->dev)->of_node,
"dma-channels", &d->dma_channels);
of_property_read_u32((&op->dev)->of_node,
"dma-requests", &d->dma_requests);
ret = of_property_read_u32((&op->dev)->of_node,
"dma-channel-mask", &d->dma_channel_mask);
if (ret) {
dev_warn(&op->dev,
"dma-channel-mask doesn't exist, considering all as available.\n");
d->dma_channel_mask = (u32)~0UL;
}
}
if (!(soc_data->flags & K3_FLAG_NOCLK)) {
d->clk = devm_clk_get(&op->dev, NULL);
if (IS_ERR(d->clk)) {
dev_err(&op->dev, "no dma clk\n");
return PTR_ERR(d->clk);
}
}
irq = platform_get_irq(op, 0);
ret = devm_request_irq(&op->dev, irq,
k3_dma_int_handler, 0, DRIVER_NAME, d);
if (ret)
return ret;
d->irq = irq;
/* A DMA memory pool for LLIs, align on 32-byte boundary */
d->pool = dmam_pool_create(DRIVER_NAME, &op->dev,
LLI_BLOCK_SIZE, 32, 0);
if (!d->pool)
return -ENOMEM;
/* init phy channel */
d->phy = devm_kcalloc(&op->dev,
d->dma_channels, sizeof(struct k3_dma_phy), GFP_KERNEL);
if (d->phy == NULL)
return -ENOMEM;
for (i = 0; i < d->dma_channels; i++) {
struct k3_dma_phy *p;
if (!(d->dma_channel_mask & BIT(i)))
continue;
p = &d->phy[i];
p->idx = i;
p->base = d->base + i * 0x40;
}
INIT_LIST_HEAD(&d->slave.channels);
dma_cap_set(DMA_SLAVE, d->slave.cap_mask);
dma_cap_set(DMA_MEMCPY, d->slave.cap_mask);
dma_cap_set(DMA_CYCLIC, d->slave.cap_mask);
d->slave.dev = &op->dev;
d->slave.device_free_chan_resources = k3_dma_free_chan_resources;
d->slave.device_tx_status = k3_dma_tx_status;
d->slave.device_prep_dma_memcpy = k3_dma_prep_memcpy;
d->slave.device_prep_slave_sg = k3_dma_prep_slave_sg;
d->slave.device_prep_dma_cyclic = k3_dma_prep_dma_cyclic;
d->slave.device_issue_pending = k3_dma_issue_pending;
d->slave.device_config = k3_dma_config;
d->slave.device_pause = k3_dma_transfer_pause;
d->slave.device_resume = k3_dma_transfer_resume;
d->slave.device_terminate_all = k3_dma_terminate_all;
d->slave.device_synchronize = k3_dma_synchronize;
d->slave.copy_align = DMAENGINE_ALIGN_8_BYTES;
/* init virtual channel */
d->chans = devm_kcalloc(&op->dev,
d->dma_requests, sizeof(struct k3_dma_chan), GFP_KERNEL);
if (d->chans == NULL)
return -ENOMEM;
for (i = 0; i < d->dma_requests; i++) {
struct k3_dma_chan *c = &d->chans[i];
c->status = DMA_IN_PROGRESS;
INIT_LIST_HEAD(&c->node);
c->vc.desc_free = k3_dma_free_desc;
vchan_init(&c->vc, &d->slave);
}
/* Enable clock before accessing registers */
ret = clk_prepare_enable(d->clk);
if (ret < 0) {
dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret);
return ret;
}
k3_dma_enable_dma(d, true);
ret = dma_async_device_register(&d->slave);
if (ret)
goto dma_async_register_fail;
ret = of_dma_controller_register((&op->dev)->of_node,
k3_of_dma_simple_xlate, d);
if (ret)
goto of_dma_register_fail;
spin_lock_init(&d->lock);
INIT_LIST_HEAD(&d->chan_pending);
tasklet_setup(&d->task, k3_dma_tasklet);
platform_set_drvdata(op, d);
dev_info(&op->dev, "initialized\n");
return 0;
of_dma_register_fail:
dma_async_device_unregister(&d->slave);
dma_async_register_fail:
clk_disable_unprepare(d->clk);
return ret;
}
static int k3_dma_remove(struct platform_device *op)
{
struct k3_dma_chan *c, *cn;
struct k3_dma_dev *d = platform_get_drvdata(op);
dma_async_device_unregister(&d->slave);
of_dma_controller_free((&op->dev)->of_node);
devm_free_irq(&op->dev, d->irq, d);
list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
list_del(&c->vc.chan.device_node);
tasklet_kill(&c->vc.task);
}
tasklet_kill(&d->task);
clk_disable_unprepare(d->clk);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int k3_dma_suspend_dev(struct device *dev)
{
struct k3_dma_dev *d = dev_get_drvdata(dev);
u32 stat = 0;
stat = k3_dma_get_chan_stat(d);
if (stat) {
dev_warn(d->slave.dev,
"chan %d is running fail to suspend\n", stat);
return -1;
}
k3_dma_enable_dma(d, false);
clk_disable_unprepare(d->clk);
return 0;
}
static int k3_dma_resume_dev(struct device *dev)
{
struct k3_dma_dev *d = dev_get_drvdata(dev);
int ret = 0;
ret = clk_prepare_enable(d->clk);
if (ret < 0) {
dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret);
return ret;
}
k3_dma_enable_dma(d, true);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend_dev, k3_dma_resume_dev);
static struct platform_driver k3_pdma_driver = {
.driver = {
.name = DRIVER_NAME,
.pm = &k3_dma_pmops,
.of_match_table = k3_pdma_dt_ids,
},
.probe = k3_dma_probe,
.remove = k3_dma_remove,
};
module_platform_driver(k3_pdma_driver);
MODULE_DESCRIPTION("HiSilicon k3 DMA Driver");
MODULE_ALIAS("platform:k3dma");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/k3dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* DMA driver for Nvidia's Tegra20 APB DMA controller.
*
* Copyright (c) 2012-2013, NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include "dmaengine.h"
#define CREATE_TRACE_POINTS
#include <trace/events/tegra_apb_dma.h>
#define TEGRA_APBDMA_GENERAL 0x0
#define TEGRA_APBDMA_GENERAL_ENABLE BIT(31)
#define TEGRA_APBDMA_CONTROL 0x010
#define TEGRA_APBDMA_IRQ_MASK 0x01c
#define TEGRA_APBDMA_IRQ_MASK_SET 0x020
/* CSR register */
#define TEGRA_APBDMA_CHAN_CSR 0x00
#define TEGRA_APBDMA_CSR_ENB BIT(31)
#define TEGRA_APBDMA_CSR_IE_EOC BIT(30)
#define TEGRA_APBDMA_CSR_HOLD BIT(29)
#define TEGRA_APBDMA_CSR_DIR BIT(28)
#define TEGRA_APBDMA_CSR_ONCE BIT(27)
#define TEGRA_APBDMA_CSR_FLOW BIT(21)
#define TEGRA_APBDMA_CSR_REQ_SEL_SHIFT 16
#define TEGRA_APBDMA_CSR_REQ_SEL_MASK 0x1F
#define TEGRA_APBDMA_CSR_WCOUNT_MASK 0xFFFC
/* STATUS register */
#define TEGRA_APBDMA_CHAN_STATUS 0x004
#define TEGRA_APBDMA_STATUS_BUSY BIT(31)
#define TEGRA_APBDMA_STATUS_ISE_EOC BIT(30)
#define TEGRA_APBDMA_STATUS_HALT BIT(29)
#define TEGRA_APBDMA_STATUS_PING_PONG BIT(28)
#define TEGRA_APBDMA_STATUS_COUNT_SHIFT 2
#define TEGRA_APBDMA_STATUS_COUNT_MASK 0xFFFC
#define TEGRA_APBDMA_CHAN_CSRE 0x00C
#define TEGRA_APBDMA_CHAN_CSRE_PAUSE BIT(31)
/* AHB memory address */
#define TEGRA_APBDMA_CHAN_AHBPTR 0x010
/* AHB sequence register */
#define TEGRA_APBDMA_CHAN_AHBSEQ 0x14
#define TEGRA_APBDMA_AHBSEQ_INTR_ENB BIT(31)
#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_8 (0 << 28)
#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_16 (1 << 28)
#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32 (2 << 28)
#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_64 (3 << 28)
#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_128 (4 << 28)
#define TEGRA_APBDMA_AHBSEQ_DATA_SWAP BIT(27)
#define TEGRA_APBDMA_AHBSEQ_BURST_1 (4 << 24)
#define TEGRA_APBDMA_AHBSEQ_BURST_4 (5 << 24)
#define TEGRA_APBDMA_AHBSEQ_BURST_8 (6 << 24)
#define TEGRA_APBDMA_AHBSEQ_DBL_BUF BIT(19)
#define TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT 16
#define TEGRA_APBDMA_AHBSEQ_WRAP_NONE 0
/* APB address */
#define TEGRA_APBDMA_CHAN_APBPTR 0x018
/* APB sequence register */
#define TEGRA_APBDMA_CHAN_APBSEQ 0x01c
#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8 (0 << 28)
#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16 (1 << 28)
#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32 (2 << 28)
#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64 (3 << 28)
#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_128 (4 << 28)
#define TEGRA_APBDMA_APBSEQ_DATA_SWAP BIT(27)
#define TEGRA_APBDMA_APBSEQ_WRAP_WORD_1 (1 << 16)
/* Tegra148 specific registers */
#define TEGRA_APBDMA_CHAN_WCOUNT 0x20
#define TEGRA_APBDMA_CHAN_WORD_TRANSFER 0x24
/*
* If any burst is in flight and DMA paused then this is the time to complete
* on-flight burst and update DMA status register.
*/
#define TEGRA_APBDMA_BURST_COMPLETE_TIME 20
/* Channel base address offset from APBDMA base address */
#define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000
#define TEGRA_APBDMA_SLAVE_ID_INVALID (TEGRA_APBDMA_CSR_REQ_SEL_MASK + 1)
struct tegra_dma;
/*
* tegra_dma_chip_data Tegra chip specific DMA data
* @nr_channels: Number of channels available in the controller.
* @channel_reg_size: Channel register size/stride.
* @max_dma_count: Maximum DMA transfer count supported by DMA controller.
* @support_channel_pause: Support channel wise pause of dma.
* @support_separate_wcount_reg: Support separate word count register.
*/
struct tegra_dma_chip_data {
unsigned int nr_channels;
unsigned int channel_reg_size;
unsigned int max_dma_count;
bool support_channel_pause;
bool support_separate_wcount_reg;
};
/* DMA channel registers */
struct tegra_dma_channel_regs {
u32 csr;
u32 ahb_ptr;
u32 apb_ptr;
u32 ahb_seq;
u32 apb_seq;
u32 wcount;
};
/*
* tegra_dma_sg_req: DMA request details to configure hardware. This
* contains the details for one transfer to configure DMA hw.
* The client's request for data transfer can be broken into multiple
* sub-transfer as per requester details and hw support.
* This sub transfer get added in the list of transfer and point to Tegra
* DMA descriptor which manages the transfer details.
*/
struct tegra_dma_sg_req {
struct tegra_dma_channel_regs ch_regs;
unsigned int req_len;
bool configured;
bool last_sg;
struct list_head node;
struct tegra_dma_desc *dma_desc;
unsigned int words_xferred;
};
/*
* tegra_dma_desc: Tegra DMA descriptors which manages the client requests.
* This descriptor keep track of transfer status, callbacks and request
* counts etc.
*/
struct tegra_dma_desc {
struct dma_async_tx_descriptor txd;
unsigned int bytes_requested;
unsigned int bytes_transferred;
enum dma_status dma_status;
struct list_head node;
struct list_head tx_list;
struct list_head cb_node;
unsigned int cb_count;
};
struct tegra_dma_channel;
typedef void (*dma_isr_handler)(struct tegra_dma_channel *tdc,
bool to_terminate);
/* tegra_dma_channel: Channel specific information */
struct tegra_dma_channel {
struct dma_chan dma_chan;
char name[12];
bool config_init;
unsigned int id;
void __iomem *chan_addr;
spinlock_t lock;
bool busy;
struct tegra_dma *tdma;
bool cyclic;
/* Different lists for managing the requests */
struct list_head free_sg_req;
struct list_head pending_sg_req;
struct list_head free_dma_desc;
struct list_head cb_desc;
/* ISR handler and tasklet for bottom half of isr handling */
dma_isr_handler isr_handler;
struct tasklet_struct tasklet;
/* Channel-slave specific configuration */
unsigned int slave_id;
struct dma_slave_config dma_sconfig;
struct tegra_dma_channel_regs channel_reg;
struct wait_queue_head wq;
};
/* tegra_dma: Tegra DMA specific information */
struct tegra_dma {
struct dma_device dma_dev;
struct device *dev;
struct clk *dma_clk;
struct reset_control *rst;
spinlock_t global_lock;
void __iomem *base_addr;
const struct tegra_dma_chip_data *chip_data;
/*
* Counter for managing global pausing of the DMA controller.
* Only applicable for devices that don't support individual
* channel pausing.
*/
u32 global_pause_count;
/* Last member of the structure */
struct tegra_dma_channel channels[];
};
static inline void tdma_write(struct tegra_dma *tdma, u32 reg, u32 val)
{
writel(val, tdma->base_addr + reg);
}
static inline void tdc_write(struct tegra_dma_channel *tdc,
u32 reg, u32 val)
{
writel(val, tdc->chan_addr + reg);
}
static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
{
return readl(tdc->chan_addr + reg);
}
static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
{
return container_of(dc, struct tegra_dma_channel, dma_chan);
}
static inline struct tegra_dma_desc *
txd_to_tegra_dma_desc(struct dma_async_tx_descriptor *td)
{
return container_of(td, struct tegra_dma_desc, txd);
}
static inline struct device *tdc2dev(struct tegra_dma_channel *tdc)
{
return &tdc->dma_chan.dev->device;
}
static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *tx);
/* Get DMA desc from free list, if not there then allocate it. */
static struct tegra_dma_desc *tegra_dma_desc_get(struct tegra_dma_channel *tdc)
{
struct tegra_dma_desc *dma_desc;
unsigned long flags;
spin_lock_irqsave(&tdc->lock, flags);
/* Do not allocate if desc are waiting for ack */
list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
if (async_tx_test_ack(&dma_desc->txd) && !dma_desc->cb_count) {
list_del(&dma_desc->node);
spin_unlock_irqrestore(&tdc->lock, flags);
dma_desc->txd.flags = 0;
return dma_desc;
}
}
spin_unlock_irqrestore(&tdc->lock, flags);
/* Allocate DMA desc */
dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
if (!dma_desc)
return NULL;
dma_async_tx_descriptor_init(&dma_desc->txd, &tdc->dma_chan);
dma_desc->txd.tx_submit = tegra_dma_tx_submit;
dma_desc->txd.flags = 0;
return dma_desc;
}
static void tegra_dma_desc_put(struct tegra_dma_channel *tdc,
struct tegra_dma_desc *dma_desc)
{
unsigned long flags;
spin_lock_irqsave(&tdc->lock, flags);
if (!list_empty(&dma_desc->tx_list))
list_splice_init(&dma_desc->tx_list, &tdc->free_sg_req);
list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
spin_unlock_irqrestore(&tdc->lock, flags);
}
static struct tegra_dma_sg_req *
tegra_dma_sg_req_get(struct tegra_dma_channel *tdc)
{
struct tegra_dma_sg_req *sg_req;
unsigned long flags;
spin_lock_irqsave(&tdc->lock, flags);
if (!list_empty(&tdc->free_sg_req)) {
sg_req = list_first_entry(&tdc->free_sg_req, typeof(*sg_req),
node);
list_del(&sg_req->node);
spin_unlock_irqrestore(&tdc->lock, flags);
return sg_req;
}
spin_unlock_irqrestore(&tdc->lock, flags);
sg_req = kzalloc(sizeof(*sg_req), GFP_NOWAIT);
return sg_req;
}
static int tegra_dma_slave_config(struct dma_chan *dc,
struct dma_slave_config *sconfig)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
if (!list_empty(&tdc->pending_sg_req)) {
dev_err(tdc2dev(tdc), "Configuration not allowed\n");
return -EBUSY;
}
memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
tdc->config_init = true;
return 0;
}
static void tegra_dma_global_pause(struct tegra_dma_channel *tdc,
bool wait_for_burst_complete)
{
struct tegra_dma *tdma = tdc->tdma;
spin_lock(&tdma->global_lock);
if (tdc->tdma->global_pause_count == 0) {
tdma_write(tdma, TEGRA_APBDMA_GENERAL, 0);
if (wait_for_burst_complete)
udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
}
tdc->tdma->global_pause_count++;
spin_unlock(&tdma->global_lock);
}
static void tegra_dma_global_resume(struct tegra_dma_channel *tdc)
{
struct tegra_dma *tdma = tdc->tdma;
spin_lock(&tdma->global_lock);
if (WARN_ON(tdc->tdma->global_pause_count == 0))
goto out;
if (--tdc->tdma->global_pause_count == 0)
tdma_write(tdma, TEGRA_APBDMA_GENERAL,
TEGRA_APBDMA_GENERAL_ENABLE);
out:
spin_unlock(&tdma->global_lock);
}
static void tegra_dma_pause(struct tegra_dma_channel *tdc,
bool wait_for_burst_complete)
{
struct tegra_dma *tdma = tdc->tdma;
if (tdma->chip_data->support_channel_pause) {
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE,
TEGRA_APBDMA_CHAN_CSRE_PAUSE);
if (wait_for_burst_complete)
udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
} else {
tegra_dma_global_pause(tdc, wait_for_burst_complete);
}
}
static void tegra_dma_resume(struct tegra_dma_channel *tdc)
{
struct tegra_dma *tdma = tdc->tdma;
if (tdma->chip_data->support_channel_pause)
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE, 0);
else
tegra_dma_global_resume(tdc);
}
static void tegra_dma_stop(struct tegra_dma_channel *tdc)
{
u32 csr, status;
/* Disable interrupts */
csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
csr &= ~TEGRA_APBDMA_CSR_IE_EOC;
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
/* Disable DMA */
csr &= ~TEGRA_APBDMA_CSR_ENB;
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
/* Clear interrupt status if it is there */
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
}
tdc->busy = false;
}
static void tegra_dma_start(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *sg_req)
{
struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, ch_regs->csr);
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_regs->apb_seq);
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_regs->apb_ptr);
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_regs->ahb_seq);
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_regs->ahb_ptr);
if (tdc->tdma->chip_data->support_separate_wcount_reg)
tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT, ch_regs->wcount);
/* Start DMA */
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
ch_regs->csr | TEGRA_APBDMA_CSR_ENB);
}
static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *nsg_req)
{
unsigned long status;
/*
* The DMA controller reloads the new configuration for next transfer
* after last burst of current transfer completes.
* If there is no IEC status then this makes sure that last burst
* has not be completed. There may be case that last burst is on
* flight and so it can complete but because DMA is paused, it
* will not generates interrupt as well as not reload the new
* configuration.
* If there is already IEC status then interrupt handler need to
* load new configuration.
*/
tegra_dma_pause(tdc, false);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
/*
* If interrupt is pending then do nothing as the ISR will handle
* the programing for new request.
*/
if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
dev_err(tdc2dev(tdc),
"Skipping new configuration as interrupt is pending\n");
tegra_dma_resume(tdc);
return;
}
/* Safe to program new configuration */
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, nsg_req->ch_regs.apb_ptr);
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->ch_regs.ahb_ptr);
if (tdc->tdma->chip_data->support_separate_wcount_reg)
tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT,
nsg_req->ch_regs.wcount);
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
nsg_req->configured = true;
nsg_req->words_xferred = 0;
tegra_dma_resume(tdc);
}
static void tdc_start_head_req(struct tegra_dma_channel *tdc)
{
struct tegra_dma_sg_req *sg_req;
sg_req = list_first_entry(&tdc->pending_sg_req, typeof(*sg_req), node);
tegra_dma_start(tdc, sg_req);
sg_req->configured = true;
sg_req->words_xferred = 0;
tdc->busy = true;
}
static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc)
{
struct tegra_dma_sg_req *hsgreq, *hnsgreq;
hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) {
hnsgreq = list_first_entry(&hsgreq->node, typeof(*hnsgreq),
node);
tegra_dma_configure_for_next(tdc, hnsgreq);
}
}
static inline unsigned int
get_current_xferred_count(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *sg_req,
unsigned long status)
{
return sg_req->req_len - (status & TEGRA_APBDMA_STATUS_COUNT_MASK) - 4;
}
static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
{
struct tegra_dma_desc *dma_desc;
struct tegra_dma_sg_req *sgreq;
while (!list_empty(&tdc->pending_sg_req)) {
sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq),
node);
list_move_tail(&sgreq->node, &tdc->free_sg_req);
if (sgreq->last_sg) {
dma_desc = sgreq->dma_desc;
dma_desc->dma_status = DMA_ERROR;
list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
/* Add in cb list if it is not there. */
if (!dma_desc->cb_count)
list_add_tail(&dma_desc->cb_node,
&tdc->cb_desc);
dma_desc->cb_count++;
}
}
tdc->isr_handler = NULL;
}
static bool handle_continuous_head_request(struct tegra_dma_channel *tdc,
bool to_terminate)
{
struct tegra_dma_sg_req *hsgreq;
/*
* Check that head req on list should be in flight.
* If it is not in flight then abort transfer as
* looping of transfer can not continue.
*/
hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
if (!hsgreq->configured) {
tegra_dma_stop(tdc);
pm_runtime_put(tdc->tdma->dev);
dev_err(tdc2dev(tdc), "DMA transfer underflow, aborting DMA\n");
tegra_dma_abort_all(tdc);
return false;
}
/* Configure next request */
if (!to_terminate)
tdc_configure_next_head_desc(tdc);
return true;
}
static void handle_once_dma_done(struct tegra_dma_channel *tdc,
bool to_terminate)
{
struct tegra_dma_desc *dma_desc;
struct tegra_dma_sg_req *sgreq;
tdc->busy = false;
sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
dma_desc = sgreq->dma_desc;
dma_desc->bytes_transferred += sgreq->req_len;
list_del(&sgreq->node);
if (sgreq->last_sg) {
dma_desc->dma_status = DMA_COMPLETE;
dma_cookie_complete(&dma_desc->txd);
if (!dma_desc->cb_count)
list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
dma_desc->cb_count++;
list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
}
list_add_tail(&sgreq->node, &tdc->free_sg_req);
/* Do not start DMA if it is going to be terminate */
if (to_terminate)
return;
if (list_empty(&tdc->pending_sg_req)) {
pm_runtime_put(tdc->tdma->dev);
return;
}
tdc_start_head_req(tdc);
}
static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc,
bool to_terminate)
{
struct tegra_dma_desc *dma_desc;
struct tegra_dma_sg_req *sgreq;
bool st;
sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
dma_desc = sgreq->dma_desc;
/* if we dma for long enough the transfer count will wrap */
dma_desc->bytes_transferred =
(dma_desc->bytes_transferred + sgreq->req_len) %
dma_desc->bytes_requested;
/* Callback need to be call */
if (!dma_desc->cb_count)
list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
dma_desc->cb_count++;
sgreq->words_xferred = 0;
/* If not last req then put at end of pending list */
if (!list_is_last(&sgreq->node, &tdc->pending_sg_req)) {
list_move_tail(&sgreq->node, &tdc->pending_sg_req);
sgreq->configured = false;
st = handle_continuous_head_request(tdc, to_terminate);
if (!st)
dma_desc->dma_status = DMA_ERROR;
}
}
static void tegra_dma_tasklet(struct tasklet_struct *t)
{
struct tegra_dma_channel *tdc = from_tasklet(tdc, t, tasklet);
struct dmaengine_desc_callback cb;
struct tegra_dma_desc *dma_desc;
unsigned int cb_count;
unsigned long flags;
spin_lock_irqsave(&tdc->lock, flags);
while (!list_empty(&tdc->cb_desc)) {
dma_desc = list_first_entry(&tdc->cb_desc, typeof(*dma_desc),
cb_node);
list_del(&dma_desc->cb_node);
dmaengine_desc_get_callback(&dma_desc->txd, &cb);
cb_count = dma_desc->cb_count;
dma_desc->cb_count = 0;
trace_tegra_dma_complete_cb(&tdc->dma_chan, cb_count,
cb.callback);
spin_unlock_irqrestore(&tdc->lock, flags);
while (cb_count--)
dmaengine_desc_callback_invoke(&cb, NULL);
spin_lock_irqsave(&tdc->lock, flags);
}
spin_unlock_irqrestore(&tdc->lock, flags);
}
static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
{
struct tegra_dma_channel *tdc = dev_id;
u32 status;
spin_lock(&tdc->lock);
trace_tegra_dma_isr(&tdc->dma_chan, irq);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
tdc->isr_handler(tdc, false);
tasklet_schedule(&tdc->tasklet);
wake_up_all(&tdc->wq);
spin_unlock(&tdc->lock);
return IRQ_HANDLED;
}
spin_unlock(&tdc->lock);
dev_info(tdc2dev(tdc), "Interrupt already served status 0x%08x\n",
status);
return IRQ_NONE;
}
static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *txd)
{
struct tegra_dma_desc *dma_desc = txd_to_tegra_dma_desc(txd);
struct tegra_dma_channel *tdc = to_tegra_dma_chan(txd->chan);
unsigned long flags;
dma_cookie_t cookie;
spin_lock_irqsave(&tdc->lock, flags);
dma_desc->dma_status = DMA_IN_PROGRESS;
cookie = dma_cookie_assign(&dma_desc->txd);
list_splice_tail_init(&dma_desc->tx_list, &tdc->pending_sg_req);
spin_unlock_irqrestore(&tdc->lock, flags);
return cookie;
}
static void tegra_dma_issue_pending(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
unsigned long flags;
int err;
spin_lock_irqsave(&tdc->lock, flags);
if (list_empty(&tdc->pending_sg_req)) {
dev_err(tdc2dev(tdc), "No DMA request\n");
goto end;
}
if (!tdc->busy) {
err = pm_runtime_resume_and_get(tdc->tdma->dev);
if (err < 0) {
dev_err(tdc2dev(tdc), "Failed to enable DMA\n");
goto end;
}
tdc_start_head_req(tdc);
/* Continuous single mode: Configure next req */
if (tdc->cyclic) {
/*
* Wait for 1 burst time for configure DMA for
* next transfer.
*/
udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
tdc_configure_next_head_desc(tdc);
}
}
end:
spin_unlock_irqrestore(&tdc->lock, flags);
}
static int tegra_dma_terminate_all(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
struct tegra_dma_desc *dma_desc;
struct tegra_dma_sg_req *sgreq;
unsigned long flags;
u32 status, wcount;
bool was_busy;
spin_lock_irqsave(&tdc->lock, flags);
if (!tdc->busy)
goto skip_dma_stop;
/* Pause DMA before checking the queue status */
tegra_dma_pause(tdc, true);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__);
tdc->isr_handler(tdc, true);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
}
if (tdc->tdma->chip_data->support_separate_wcount_reg)
wcount = tdc_read(tdc, TEGRA_APBDMA_CHAN_WORD_TRANSFER);
else
wcount = status;
was_busy = tdc->busy;
tegra_dma_stop(tdc);
if (!list_empty(&tdc->pending_sg_req) && was_busy) {
sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq),
node);
sgreq->dma_desc->bytes_transferred +=
get_current_xferred_count(tdc, sgreq, wcount);
}
tegra_dma_resume(tdc);
pm_runtime_put(tdc->tdma->dev);
wake_up_all(&tdc->wq);
skip_dma_stop:
tegra_dma_abort_all(tdc);
while (!list_empty(&tdc->cb_desc)) {
dma_desc = list_first_entry(&tdc->cb_desc, typeof(*dma_desc),
cb_node);
list_del(&dma_desc->cb_node);
dma_desc->cb_count = 0;
}
spin_unlock_irqrestore(&tdc->lock, flags);
return 0;
}
static bool tegra_dma_eoc_interrupt_deasserted(struct tegra_dma_channel *tdc)
{
unsigned long flags;
u32 status;
spin_lock_irqsave(&tdc->lock, flags);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
spin_unlock_irqrestore(&tdc->lock, flags);
return !(status & TEGRA_APBDMA_STATUS_ISE_EOC);
}
static void tegra_dma_synchronize(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
int err;
err = pm_runtime_resume_and_get(tdc->tdma->dev);
if (err < 0) {
dev_err(tdc2dev(tdc), "Failed to synchronize DMA: %d\n", err);
return;
}
/*
* CPU, which handles interrupt, could be busy in
* uninterruptible state, in this case sibling CPU
* should wait until interrupt is handled.
*/
wait_event(tdc->wq, tegra_dma_eoc_interrupt_deasserted(tdc));
tasklet_kill(&tdc->tasklet);
pm_runtime_put(tdc->tdma->dev);
}
static unsigned int tegra_dma_sg_bytes_xferred(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *sg_req)
{
u32 status, wcount = 0;
if (!list_is_first(&sg_req->node, &tdc->pending_sg_req))
return 0;
if (tdc->tdma->chip_data->support_separate_wcount_reg)
wcount = tdc_read(tdc, TEGRA_APBDMA_CHAN_WORD_TRANSFER);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
if (!tdc->tdma->chip_data->support_separate_wcount_reg)
wcount = status;
if (status & TEGRA_APBDMA_STATUS_ISE_EOC)
return sg_req->req_len;
wcount = get_current_xferred_count(tdc, sg_req, wcount);
if (!wcount) {
/*
* If wcount wasn't ever polled for this SG before, then
* simply assume that transfer hasn't started yet.
*
* Otherwise it's the end of the transfer.
*
* The alternative would be to poll the status register
* until EOC bit is set or wcount goes UP. That's so
* because EOC bit is getting set only after the last
* burst's completion and counter is less than the actual
* transfer size by 4 bytes. The counter value wraps around
* in a cyclic mode before EOC is set(!), so we can't easily
* distinguish start of transfer from its end.
*/
if (sg_req->words_xferred)
wcount = sg_req->req_len - 4;
} else if (wcount < sg_req->words_xferred) {
/*
* This case will never happen for a non-cyclic transfer.
*
* For a cyclic transfer, although it is possible for the
* next transfer to have already started (resetting the word
* count), this case should still not happen because we should
* have detected that the EOC bit is set and hence the transfer
* was completed.
*/
WARN_ON_ONCE(1);
wcount = sg_req->req_len - 4;
} else {
sg_req->words_xferred = wcount;
}
return wcount;
}
static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
struct tegra_dma_desc *dma_desc;
struct tegra_dma_sg_req *sg_req;
enum dma_status ret;
unsigned long flags;
unsigned int residual;
unsigned int bytes = 0;
ret = dma_cookie_status(dc, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
spin_lock_irqsave(&tdc->lock, flags);
/* Check on wait_ack desc status */
list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
if (dma_desc->txd.cookie == cookie) {
ret = dma_desc->dma_status;
goto found;
}
}
/* Check in pending list */
list_for_each_entry(sg_req, &tdc->pending_sg_req, node) {
dma_desc = sg_req->dma_desc;
if (dma_desc->txd.cookie == cookie) {
bytes = tegra_dma_sg_bytes_xferred(tdc, sg_req);
ret = dma_desc->dma_status;
goto found;
}
}
dev_dbg(tdc2dev(tdc), "cookie %d not found\n", cookie);
dma_desc = NULL;
found:
if (dma_desc && txstate) {
residual = dma_desc->bytes_requested -
((dma_desc->bytes_transferred + bytes) %
dma_desc->bytes_requested);
dma_set_residue(txstate, residual);
}
trace_tegra_dma_tx_status(&tdc->dma_chan, cookie, txstate);
spin_unlock_irqrestore(&tdc->lock, flags);
return ret;
}
static inline unsigned int get_bus_width(struct tegra_dma_channel *tdc,
enum dma_slave_buswidth slave_bw)
{
switch (slave_bw) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
case DMA_SLAVE_BUSWIDTH_8_BYTES:
return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64;
default:
dev_warn(tdc2dev(tdc),
"slave bw is not supported, using 32bits\n");
return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
}
}
static inline unsigned int get_burst_size(struct tegra_dma_channel *tdc,
u32 burst_size,
enum dma_slave_buswidth slave_bw,
u32 len)
{
unsigned int burst_byte, burst_ahb_width;
/*
* burst_size from client is in terms of the bus_width.
* convert them into AHB memory width which is 4 byte.
*/
burst_byte = burst_size * slave_bw;
burst_ahb_width = burst_byte / 4;
/* If burst size is 0 then calculate the burst size based on length */
if (!burst_ahb_width) {
if (len & 0xF)
return TEGRA_APBDMA_AHBSEQ_BURST_1;
else if ((len >> 4) & 0x1)
return TEGRA_APBDMA_AHBSEQ_BURST_4;
else
return TEGRA_APBDMA_AHBSEQ_BURST_8;
}
if (burst_ahb_width < 4)
return TEGRA_APBDMA_AHBSEQ_BURST_1;
else if (burst_ahb_width < 8)
return TEGRA_APBDMA_AHBSEQ_BURST_4;
else
return TEGRA_APBDMA_AHBSEQ_BURST_8;
}
static int get_transfer_param(struct tegra_dma_channel *tdc,
enum dma_transfer_direction direction,
u32 *apb_addr,
u32 *apb_seq,
u32 *csr,
unsigned int *burst_size,
enum dma_slave_buswidth *slave_bw)
{
switch (direction) {
case DMA_MEM_TO_DEV:
*apb_addr = tdc->dma_sconfig.dst_addr;
*apb_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
*burst_size = tdc->dma_sconfig.dst_maxburst;
*slave_bw = tdc->dma_sconfig.dst_addr_width;
*csr = TEGRA_APBDMA_CSR_DIR;
return 0;
case DMA_DEV_TO_MEM:
*apb_addr = tdc->dma_sconfig.src_addr;
*apb_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
*burst_size = tdc->dma_sconfig.src_maxburst;
*slave_bw = tdc->dma_sconfig.src_addr_width;
*csr = 0;
return 0;
default:
dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
break;
}
return -EINVAL;
}
static void tegra_dma_prep_wcount(struct tegra_dma_channel *tdc,
struct tegra_dma_channel_regs *ch_regs,
u32 len)
{
u32 len_field = (len - 4) & 0xFFFC;
if (tdc->tdma->chip_data->support_separate_wcount_reg)
ch_regs->wcount = len_field;
else
ch_regs->csr |= len_field;
}
static struct dma_async_tx_descriptor *
tegra_dma_prep_slave_sg(struct dma_chan *dc,
struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long flags,
void *context)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
struct tegra_dma_sg_req *sg_req = NULL;
u32 csr, ahb_seq, apb_ptr, apb_seq;
enum dma_slave_buswidth slave_bw;
struct tegra_dma_desc *dma_desc;
struct list_head req_list;
struct scatterlist *sg;
unsigned int burst_size;
unsigned int i;
if (!tdc->config_init) {
dev_err(tdc2dev(tdc), "DMA channel is not configured\n");
return NULL;
}
if (sg_len < 1) {
dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
return NULL;
}
if (get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
&burst_size, &slave_bw) < 0)
return NULL;
INIT_LIST_HEAD(&req_list);
ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
csr |= TEGRA_APBDMA_CSR_ONCE;
if (tdc->slave_id != TEGRA_APBDMA_SLAVE_ID_INVALID) {
csr |= TEGRA_APBDMA_CSR_FLOW;
csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
}
if (flags & DMA_PREP_INTERRUPT) {
csr |= TEGRA_APBDMA_CSR_IE_EOC;
} else {
WARN_ON_ONCE(1);
return NULL;
}
apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
dma_desc = tegra_dma_desc_get(tdc);
if (!dma_desc) {
dev_err(tdc2dev(tdc), "DMA descriptors not available\n");
return NULL;
}
INIT_LIST_HEAD(&dma_desc->tx_list);
INIT_LIST_HEAD(&dma_desc->cb_node);
dma_desc->cb_count = 0;
dma_desc->bytes_requested = 0;
dma_desc->bytes_transferred = 0;
dma_desc->dma_status = DMA_IN_PROGRESS;
/* Make transfer requests */
for_each_sg(sgl, sg, sg_len, i) {
u32 len, mem;
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
if ((len & 3) || (mem & 3) ||
len > tdc->tdma->chip_data->max_dma_count) {
dev_err(tdc2dev(tdc),
"DMA length/memory address is not supported\n");
tegra_dma_desc_put(tdc, dma_desc);
return NULL;
}
sg_req = tegra_dma_sg_req_get(tdc);
if (!sg_req) {
dev_err(tdc2dev(tdc), "DMA sg-req not available\n");
tegra_dma_desc_put(tdc, dma_desc);
return NULL;
}
ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
dma_desc->bytes_requested += len;
sg_req->ch_regs.apb_ptr = apb_ptr;
sg_req->ch_regs.ahb_ptr = mem;
sg_req->ch_regs.csr = csr;
tegra_dma_prep_wcount(tdc, &sg_req->ch_regs, len);
sg_req->ch_regs.apb_seq = apb_seq;
sg_req->ch_regs.ahb_seq = ahb_seq;
sg_req->configured = false;
sg_req->last_sg = false;
sg_req->dma_desc = dma_desc;
sg_req->req_len = len;
list_add_tail(&sg_req->node, &dma_desc->tx_list);
}
sg_req->last_sg = true;
if (flags & DMA_CTRL_ACK)
dma_desc->txd.flags = DMA_CTRL_ACK;
/*
* Make sure that mode should not be conflicting with currently
* configured mode.
*/
if (!tdc->isr_handler) {
tdc->isr_handler = handle_once_dma_done;
tdc->cyclic = false;
} else {
if (tdc->cyclic) {
dev_err(tdc2dev(tdc), "DMA configured in cyclic mode\n");
tegra_dma_desc_put(tdc, dma_desc);
return NULL;
}
}
return &dma_desc->txd;
}
static struct dma_async_tx_descriptor *
tegra_dma_prep_dma_cyclic(struct dma_chan *dc, dma_addr_t buf_addr,
size_t buf_len,
size_t period_len,
enum dma_transfer_direction direction,
unsigned long flags)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
struct tegra_dma_sg_req *sg_req = NULL;
u32 csr, ahb_seq, apb_ptr, apb_seq;
enum dma_slave_buswidth slave_bw;
struct tegra_dma_desc *dma_desc;
dma_addr_t mem = buf_addr;
unsigned int burst_size;
size_t len, remain_len;
if (!buf_len || !period_len) {
dev_err(tdc2dev(tdc), "Invalid buffer/period len\n");
return NULL;
}
if (!tdc->config_init) {
dev_err(tdc2dev(tdc), "DMA slave is not configured\n");
return NULL;
}
/*
* We allow to take more number of requests till DMA is
* not started. The driver will loop over all requests.
* Once DMA is started then new requests can be queued only after
* terminating the DMA.
*/
if (tdc->busy) {
dev_err(tdc2dev(tdc), "Request not allowed when DMA running\n");
return NULL;
}
/*
* We only support cycle transfer when buf_len is multiple of
* period_len.
*/
if (buf_len % period_len) {
dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n");
return NULL;
}
len = period_len;
if ((len & 3) || (buf_addr & 3) ||
len > tdc->tdma->chip_data->max_dma_count) {
dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n");
return NULL;
}
if (get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
&burst_size, &slave_bw) < 0)
return NULL;
ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
if (tdc->slave_id != TEGRA_APBDMA_SLAVE_ID_INVALID) {
csr |= TEGRA_APBDMA_CSR_FLOW;
csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
}
if (flags & DMA_PREP_INTERRUPT) {
csr |= TEGRA_APBDMA_CSR_IE_EOC;
} else {
WARN_ON_ONCE(1);
return NULL;
}
apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
dma_desc = tegra_dma_desc_get(tdc);
if (!dma_desc) {
dev_err(tdc2dev(tdc), "not enough descriptors available\n");
return NULL;
}
INIT_LIST_HEAD(&dma_desc->tx_list);
INIT_LIST_HEAD(&dma_desc->cb_node);
dma_desc->cb_count = 0;
dma_desc->bytes_transferred = 0;
dma_desc->bytes_requested = buf_len;
remain_len = buf_len;
/* Split transfer equal to period size */
while (remain_len) {
sg_req = tegra_dma_sg_req_get(tdc);
if (!sg_req) {
dev_err(tdc2dev(tdc), "DMA sg-req not available\n");
tegra_dma_desc_put(tdc, dma_desc);
return NULL;
}
ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
sg_req->ch_regs.apb_ptr = apb_ptr;
sg_req->ch_regs.ahb_ptr = mem;
sg_req->ch_regs.csr = csr;
tegra_dma_prep_wcount(tdc, &sg_req->ch_regs, len);
sg_req->ch_regs.apb_seq = apb_seq;
sg_req->ch_regs.ahb_seq = ahb_seq;
sg_req->configured = false;
sg_req->last_sg = false;
sg_req->dma_desc = dma_desc;
sg_req->req_len = len;
list_add_tail(&sg_req->node, &dma_desc->tx_list);
remain_len -= len;
mem += len;
}
sg_req->last_sg = true;
if (flags & DMA_CTRL_ACK)
dma_desc->txd.flags = DMA_CTRL_ACK;
/*
* Make sure that mode should not be conflicting with currently
* configured mode.
*/
if (!tdc->isr_handler) {
tdc->isr_handler = handle_cont_sngl_cycle_dma_done;
tdc->cyclic = true;
} else {
if (!tdc->cyclic) {
dev_err(tdc2dev(tdc), "DMA configuration conflict\n");
tegra_dma_desc_put(tdc, dma_desc);
return NULL;
}
}
return &dma_desc->txd;
}
static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
dma_cookie_init(&tdc->dma_chan);
return 0;
}
static void tegra_dma_free_chan_resources(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
struct tegra_dma_desc *dma_desc;
struct tegra_dma_sg_req *sg_req;
struct list_head dma_desc_list;
struct list_head sg_req_list;
INIT_LIST_HEAD(&dma_desc_list);
INIT_LIST_HEAD(&sg_req_list);
dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
tegra_dma_terminate_all(dc);
tasklet_kill(&tdc->tasklet);
list_splice_init(&tdc->pending_sg_req, &sg_req_list);
list_splice_init(&tdc->free_sg_req, &sg_req_list);
list_splice_init(&tdc->free_dma_desc, &dma_desc_list);
INIT_LIST_HEAD(&tdc->cb_desc);
tdc->config_init = false;
tdc->isr_handler = NULL;
while (!list_empty(&dma_desc_list)) {
dma_desc = list_first_entry(&dma_desc_list, typeof(*dma_desc),
node);
list_del(&dma_desc->node);
kfree(dma_desc);
}
while (!list_empty(&sg_req_list)) {
sg_req = list_first_entry(&sg_req_list, typeof(*sg_req), node);
list_del(&sg_req->node);
kfree(sg_req);
}
tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
}
static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct tegra_dma *tdma = ofdma->of_dma_data;
struct tegra_dma_channel *tdc;
struct dma_chan *chan;
if (dma_spec->args[0] > TEGRA_APBDMA_CSR_REQ_SEL_MASK) {
dev_err(tdma->dev, "Invalid slave id: %d\n", dma_spec->args[0]);
return NULL;
}
chan = dma_get_any_slave_channel(&tdma->dma_dev);
if (!chan)
return NULL;
tdc = to_tegra_dma_chan(chan);
tdc->slave_id = dma_spec->args[0];
return chan;
}
/* Tegra20 specific DMA controller information */
static const struct tegra_dma_chip_data tegra20_dma_chip_data = {
.nr_channels = 16,
.channel_reg_size = 0x20,
.max_dma_count = 1024UL * 64,
.support_channel_pause = false,
.support_separate_wcount_reg = false,
};
/* Tegra30 specific DMA controller information */
static const struct tegra_dma_chip_data tegra30_dma_chip_data = {
.nr_channels = 32,
.channel_reg_size = 0x20,
.max_dma_count = 1024UL * 64,
.support_channel_pause = false,
.support_separate_wcount_reg = false,
};
/* Tegra114 specific DMA controller information */
static const struct tegra_dma_chip_data tegra114_dma_chip_data = {
.nr_channels = 32,
.channel_reg_size = 0x20,
.max_dma_count = 1024UL * 64,
.support_channel_pause = true,
.support_separate_wcount_reg = false,
};
/* Tegra148 specific DMA controller information */
static const struct tegra_dma_chip_data tegra148_dma_chip_data = {
.nr_channels = 32,
.channel_reg_size = 0x40,
.max_dma_count = 1024UL * 64,
.support_channel_pause = true,
.support_separate_wcount_reg = true,
};
static int tegra_dma_init_hw(struct tegra_dma *tdma)
{
int err;
err = reset_control_assert(tdma->rst);
if (err) {
dev_err(tdma->dev, "failed to assert reset: %d\n", err);
return err;
}
err = clk_enable(tdma->dma_clk);
if (err) {
dev_err(tdma->dev, "failed to enable clk: %d\n", err);
return err;
}
/* reset DMA controller */
udelay(2);
reset_control_deassert(tdma->rst);
/* enable global DMA registers */
tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE);
tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0);
tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFF);
clk_disable(tdma->dma_clk);
return 0;
}
static int tegra_dma_probe(struct platform_device *pdev)
{
const struct tegra_dma_chip_data *cdata;
struct tegra_dma *tdma;
unsigned int i;
size_t size;
int ret;
cdata = of_device_get_match_data(&pdev->dev);
size = struct_size(tdma, channels, cdata->nr_channels);
tdma = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
if (!tdma)
return -ENOMEM;
tdma->dev = &pdev->dev;
tdma->chip_data = cdata;
platform_set_drvdata(pdev, tdma);
tdma->base_addr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(tdma->base_addr))
return PTR_ERR(tdma->base_addr);
tdma->dma_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(tdma->dma_clk)) {
dev_err(&pdev->dev, "Error: Missing controller clock\n");
return PTR_ERR(tdma->dma_clk);
}
tdma->rst = devm_reset_control_get(&pdev->dev, "dma");
if (IS_ERR(tdma->rst)) {
dev_err(&pdev->dev, "Error: Missing reset\n");
return PTR_ERR(tdma->rst);
}
spin_lock_init(&tdma->global_lock);
ret = clk_prepare(tdma->dma_clk);
if (ret)
return ret;
ret = tegra_dma_init_hw(tdma);
if (ret)
goto err_clk_unprepare;
pm_runtime_irq_safe(&pdev->dev);
pm_runtime_enable(&pdev->dev);
INIT_LIST_HEAD(&tdma->dma_dev.channels);
for (i = 0; i < cdata->nr_channels; i++) {
struct tegra_dma_channel *tdc = &tdma->channels[i];
int irq;
tdc->chan_addr = tdma->base_addr +
TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET +
(i * cdata->channel_reg_size);
irq = platform_get_irq(pdev, i);
if (irq < 0) {
ret = irq;
goto err_pm_disable;
}
snprintf(tdc->name, sizeof(tdc->name), "apbdma.%d", i);
ret = devm_request_irq(&pdev->dev, irq, tegra_dma_isr, 0,
tdc->name, tdc);
if (ret) {
dev_err(&pdev->dev,
"request_irq failed with err %d channel %d\n",
ret, i);
goto err_pm_disable;
}
tdc->dma_chan.device = &tdma->dma_dev;
dma_cookie_init(&tdc->dma_chan);
list_add_tail(&tdc->dma_chan.device_node,
&tdma->dma_dev.channels);
tdc->tdma = tdma;
tdc->id = i;
tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
tasklet_setup(&tdc->tasklet, tegra_dma_tasklet);
spin_lock_init(&tdc->lock);
init_waitqueue_head(&tdc->wq);
INIT_LIST_HEAD(&tdc->pending_sg_req);
INIT_LIST_HEAD(&tdc->free_sg_req);
INIT_LIST_HEAD(&tdc->free_dma_desc);
INIT_LIST_HEAD(&tdc->cb_desc);
}
dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
tdma->global_pause_count = 0;
tdma->dma_dev.dev = &pdev->dev;
tdma->dma_dev.device_alloc_chan_resources =
tegra_dma_alloc_chan_resources;
tdma->dma_dev.device_free_chan_resources =
tegra_dma_free_chan_resources;
tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg;
tdma->dma_dev.device_prep_dma_cyclic = tegra_dma_prep_dma_cyclic;
tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
tdma->dma_dev.device_config = tegra_dma_slave_config;
tdma->dma_dev.device_terminate_all = tegra_dma_terminate_all;
tdma->dma_dev.device_synchronize = tegra_dma_synchronize;
tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
ret = dma_async_device_register(&tdma->dma_dev);
if (ret < 0) {
dev_err(&pdev->dev,
"Tegra20 APB DMA driver registration failed %d\n", ret);
goto err_pm_disable;
}
ret = of_dma_controller_register(pdev->dev.of_node,
tegra_dma_of_xlate, tdma);
if (ret < 0) {
dev_err(&pdev->dev,
"Tegra20 APB DMA OF registration failed %d\n", ret);
goto err_unregister_dma_dev;
}
dev_info(&pdev->dev, "Tegra20 APB DMA driver registered %u channels\n",
cdata->nr_channels);
return 0;
err_unregister_dma_dev:
dma_async_device_unregister(&tdma->dma_dev);
err_pm_disable:
pm_runtime_disable(&pdev->dev);
err_clk_unprepare:
clk_unprepare(tdma->dma_clk);
return ret;
}
static int tegra_dma_remove(struct platform_device *pdev)
{
struct tegra_dma *tdma = platform_get_drvdata(pdev);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&tdma->dma_dev);
pm_runtime_disable(&pdev->dev);
clk_unprepare(tdma->dma_clk);
return 0;
}
static int __maybe_unused tegra_dma_runtime_suspend(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
clk_disable(tdma->dma_clk);
return 0;
}
static int __maybe_unused tegra_dma_runtime_resume(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
return clk_enable(tdma->dma_clk);
}
static int __maybe_unused tegra_dma_dev_suspend(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
unsigned long flags;
unsigned int i;
bool busy;
for (i = 0; i < tdma->chip_data->nr_channels; i++) {
struct tegra_dma_channel *tdc = &tdma->channels[i];
tasklet_kill(&tdc->tasklet);
spin_lock_irqsave(&tdc->lock, flags);
busy = tdc->busy;
spin_unlock_irqrestore(&tdc->lock, flags);
if (busy) {
dev_err(tdma->dev, "channel %u busy\n", i);
return -EBUSY;
}
}
return pm_runtime_force_suspend(dev);
}
static int __maybe_unused tegra_dma_dev_resume(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
int err;
err = tegra_dma_init_hw(tdma);
if (err)
return err;
return pm_runtime_force_resume(dev);
}
static const struct dev_pm_ops tegra_dma_dev_pm_ops = {
SET_RUNTIME_PM_OPS(tegra_dma_runtime_suspend, tegra_dma_runtime_resume,
NULL)
SET_SYSTEM_SLEEP_PM_OPS(tegra_dma_dev_suspend, tegra_dma_dev_resume)
};
static const struct of_device_id tegra_dma_of_match[] = {
{
.compatible = "nvidia,tegra148-apbdma",
.data = &tegra148_dma_chip_data,
}, {
.compatible = "nvidia,tegra114-apbdma",
.data = &tegra114_dma_chip_data,
}, {
.compatible = "nvidia,tegra30-apbdma",
.data = &tegra30_dma_chip_data,
}, {
.compatible = "nvidia,tegra20-apbdma",
.data = &tegra20_dma_chip_data,
}, {
},
};
MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
static struct platform_driver tegra_dmac_driver = {
.driver = {
.name = "tegra-apbdma",
.pm = &tegra_dma_dev_pm_ops,
.of_match_table = tegra_dma_of_match,
},
.probe = tegra_dma_probe,
.remove = tegra_dma_remove,
};
module_platform_driver(tegra_dmac_driver);
MODULE_DESCRIPTION("NVIDIA Tegra APB DMA Controller driver");
MODULE_AUTHOR("Laxman Dewangan <[email protected]>");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/tegra20-apb-dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* DMA Engine test module
*
* Copyright (C) 2007 Atmel Corporation
* Copyright (C) 2013 Intel Corporation
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/freezer.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/sched/task.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/wait.h>
static unsigned int test_buf_size = 16384;
module_param(test_buf_size, uint, 0644);
MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
static char test_device[32];
module_param_string(device, test_device, sizeof(test_device), 0644);
MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
static unsigned int threads_per_chan = 1;
module_param(threads_per_chan, uint, 0644);
MODULE_PARM_DESC(threads_per_chan,
"Number of threads to start per channel (default: 1)");
static unsigned int max_channels;
module_param(max_channels, uint, 0644);
MODULE_PARM_DESC(max_channels,
"Maximum number of channels to use (default: all)");
static unsigned int iterations;
module_param(iterations, uint, 0644);
MODULE_PARM_DESC(iterations,
"Iterations before stopping test (default: infinite)");
static unsigned int dmatest;
module_param(dmatest, uint, 0644);
MODULE_PARM_DESC(dmatest,
"dmatest 0-memcpy 1-memset (default: 0)");
static unsigned int xor_sources = 3;
module_param(xor_sources, uint, 0644);
MODULE_PARM_DESC(xor_sources,
"Number of xor source buffers (default: 3)");
static unsigned int pq_sources = 3;
module_param(pq_sources, uint, 0644);
MODULE_PARM_DESC(pq_sources,
"Number of p+q source buffers (default: 3)");
static int timeout = 3000;
module_param(timeout, int, 0644);
MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
"Pass -1 for infinite timeout");
static bool noverify;
module_param(noverify, bool, 0644);
MODULE_PARM_DESC(noverify, "Disable data verification (default: verify)");
static bool norandom;
module_param(norandom, bool, 0644);
MODULE_PARM_DESC(norandom, "Disable random offset setup (default: random)");
static bool verbose;
module_param(verbose, bool, 0644);
MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)");
static int alignment = -1;
module_param(alignment, int, 0644);
MODULE_PARM_DESC(alignment, "Custom data address alignment taken as 2^(alignment) (default: not used (-1))");
static unsigned int transfer_size;
module_param(transfer_size, uint, 0644);
MODULE_PARM_DESC(transfer_size, "Optional custom transfer size in bytes (default: not used (0))");
static bool polled;
module_param(polled, bool, 0644);
MODULE_PARM_DESC(polled, "Use polling for completion instead of interrupts");
/**
* struct dmatest_params - test parameters.
* @buf_size: size of the memcpy test buffer
* @channel: bus ID of the channel to test
* @device: bus ID of the DMA Engine to test
* @threads_per_chan: number of threads to start per channel
* @max_channels: maximum number of channels to use
* @iterations: iterations before stopping test
* @xor_sources: number of xor source buffers
* @pq_sources: number of p+q source buffers
* @timeout: transfer timeout in msec, -1 for infinite timeout
* @noverify: disable data verification
* @norandom: disable random offset setup
* @alignment: custom data address alignment taken as 2^alignment
* @transfer_size: custom transfer size in bytes
* @polled: use polling for completion instead of interrupts
*/
struct dmatest_params {
unsigned int buf_size;
char channel[20];
char device[32];
unsigned int threads_per_chan;
unsigned int max_channels;
unsigned int iterations;
unsigned int xor_sources;
unsigned int pq_sources;
int timeout;
bool noverify;
bool norandom;
int alignment;
unsigned int transfer_size;
bool polled;
};
/**
* struct dmatest_info - test information.
* @params: test parameters
* @channels: channels under test
* @nr_channels: number of channels under test
* @lock: access protection to the fields of this structure
* @did_init: module has been initialized completely
* @last_error: test has faced configuration issues
*/
static struct dmatest_info {
/* Test parameters */
struct dmatest_params params;
/* Internal state */
struct list_head channels;
unsigned int nr_channels;
int last_error;
struct mutex lock;
bool did_init;
} test_info = {
.channels = LIST_HEAD_INIT(test_info.channels),
.lock = __MUTEX_INITIALIZER(test_info.lock),
};
static int dmatest_run_set(const char *val, const struct kernel_param *kp);
static int dmatest_run_get(char *val, const struct kernel_param *kp);
static const struct kernel_param_ops run_ops = {
.set = dmatest_run_set,
.get = dmatest_run_get,
};
static bool dmatest_run;
module_param_cb(run, &run_ops, &dmatest_run, 0644);
MODULE_PARM_DESC(run, "Run the test (default: false)");
static int dmatest_chan_set(const char *val, const struct kernel_param *kp);
static int dmatest_chan_get(char *val, const struct kernel_param *kp);
static const struct kernel_param_ops multi_chan_ops = {
.set = dmatest_chan_set,
.get = dmatest_chan_get,
};
static char test_channel[20];
static struct kparam_string newchan_kps = {
.string = test_channel,
.maxlen = 20,
};
module_param_cb(channel, &multi_chan_ops, &newchan_kps, 0644);
MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
static int dmatest_test_list_get(char *val, const struct kernel_param *kp);
static const struct kernel_param_ops test_list_ops = {
.get = dmatest_test_list_get,
};
module_param_cb(test_list, &test_list_ops, NULL, 0444);
MODULE_PARM_DESC(test_list, "Print current test list");
/* Maximum amount of mismatched bytes in buffer to print */
#define MAX_ERROR_COUNT 32
/*
* Initialization patterns. All bytes in the source buffer has bit 7
* set, all bytes in the destination buffer has bit 7 cleared.
*
* Bit 6 is set for all bytes which are to be copied by the DMA
* engine. Bit 5 is set for all bytes which are to be overwritten by
* the DMA engine.
*
* The remaining bits are the inverse of a counter which increments by
* one for each byte address.
*/
#define PATTERN_SRC 0x80
#define PATTERN_DST 0x00
#define PATTERN_COPY 0x40
#define PATTERN_OVERWRITE 0x20
#define PATTERN_COUNT_MASK 0x1f
#define PATTERN_MEMSET_IDX 0x01
/* Fixed point arithmetic ops */
#define FIXPT_SHIFT 8
#define FIXPNT_MASK 0xFF
#define FIXPT_TO_INT(a) ((a) >> FIXPT_SHIFT)
#define INT_TO_FIXPT(a) ((a) << FIXPT_SHIFT)
#define FIXPT_GET_FRAC(a) ((((a) & FIXPNT_MASK) * 100) >> FIXPT_SHIFT)
/* poor man's completion - we want to use wait_event_freezable() on it */
struct dmatest_done {
bool done;
wait_queue_head_t *wait;
};
struct dmatest_data {
u8 **raw;
u8 **aligned;
unsigned int cnt;
unsigned int off;
};
struct dmatest_thread {
struct list_head node;
struct dmatest_info *info;
struct task_struct *task;
struct dma_chan *chan;
struct dmatest_data src;
struct dmatest_data dst;
enum dma_transaction_type type;
wait_queue_head_t done_wait;
struct dmatest_done test_done;
bool done;
bool pending;
};
struct dmatest_chan {
struct list_head node;
struct dma_chan *chan;
struct list_head threads;
};
static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
static bool wait;
static bool is_threaded_test_run(struct dmatest_info *info)
{
struct dmatest_chan *dtc;
list_for_each_entry(dtc, &info->channels, node) {
struct dmatest_thread *thread;
list_for_each_entry(thread, &dtc->threads, node) {
if (!thread->done && !thread->pending)
return true;
}
}
return false;
}
static bool is_threaded_test_pending(struct dmatest_info *info)
{
struct dmatest_chan *dtc;
list_for_each_entry(dtc, &info->channels, node) {
struct dmatest_thread *thread;
list_for_each_entry(thread, &dtc->threads, node) {
if (thread->pending)
return true;
}
}
return false;
}
static int dmatest_wait_get(char *val, const struct kernel_param *kp)
{
struct dmatest_info *info = &test_info;
struct dmatest_params *params = &info->params;
if (params->iterations)
wait_event(thread_wait, !is_threaded_test_run(info));
wait = true;
return param_get_bool(val, kp);
}
static const struct kernel_param_ops wait_ops = {
.get = dmatest_wait_get,
.set = param_set_bool,
};
module_param_cb(wait, &wait_ops, &wait, 0444);
MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)");
static bool dmatest_match_channel(struct dmatest_params *params,
struct dma_chan *chan)
{
if (params->channel[0] == '\0')
return true;
return strcmp(dma_chan_name(chan), params->channel) == 0;
}
static bool dmatest_match_device(struct dmatest_params *params,
struct dma_device *device)
{
if (params->device[0] == '\0')
return true;
return strcmp(dev_name(device->dev), params->device) == 0;
}
static unsigned long dmatest_random(void)
{
unsigned long buf;
get_random_bytes(&buf, sizeof(buf));
return buf;
}
static inline u8 gen_inv_idx(u8 index, bool is_memset)
{
u8 val = is_memset ? PATTERN_MEMSET_IDX : index;
return ~val & PATTERN_COUNT_MASK;
}
static inline u8 gen_src_value(u8 index, bool is_memset)
{
return PATTERN_SRC | gen_inv_idx(index, is_memset);
}
static inline u8 gen_dst_value(u8 index, bool is_memset)
{
return PATTERN_DST | gen_inv_idx(index, is_memset);
}
static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
unsigned int buf_size, bool is_memset)
{
unsigned int i;
u8 *buf;
for (; (buf = *bufs); bufs++) {
for (i = 0; i < start; i++)
buf[i] = gen_src_value(i, is_memset);
for ( ; i < start + len; i++)
buf[i] = gen_src_value(i, is_memset) | PATTERN_COPY;
for ( ; i < buf_size; i++)
buf[i] = gen_src_value(i, is_memset);
buf++;
}
}
static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
unsigned int buf_size, bool is_memset)
{
unsigned int i;
u8 *buf;
for (; (buf = *bufs); bufs++) {
for (i = 0; i < start; i++)
buf[i] = gen_dst_value(i, is_memset);
for ( ; i < start + len; i++)
buf[i] = gen_dst_value(i, is_memset) |
PATTERN_OVERWRITE;
for ( ; i < buf_size; i++)
buf[i] = gen_dst_value(i, is_memset);
}
}
static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
unsigned int counter, bool is_srcbuf, bool is_memset)
{
u8 diff = actual ^ pattern;
u8 expected = pattern | gen_inv_idx(counter, is_memset);
const char *thread_name = current->comm;
if (is_srcbuf)
pr_warn("%s: srcbuf[0x%x] overwritten! Expected %02x, got %02x\n",
thread_name, index, expected, actual);
else if ((pattern & PATTERN_COPY)
&& (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
pr_warn("%s: dstbuf[0x%x] not copied! Expected %02x, got %02x\n",
thread_name, index, expected, actual);
else if (diff & PATTERN_SRC)
pr_warn("%s: dstbuf[0x%x] was copied! Expected %02x, got %02x\n",
thread_name, index, expected, actual);
else
pr_warn("%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n",
thread_name, index, expected, actual);
}
static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
unsigned int end, unsigned int counter, u8 pattern,
bool is_srcbuf, bool is_memset)
{
unsigned int i;
unsigned int error_count = 0;
u8 actual;
u8 expected;
u8 *buf;
unsigned int counter_orig = counter;
for (; (buf = *bufs); bufs++) {
counter = counter_orig;
for (i = start; i < end; i++) {
actual = buf[i];
expected = pattern | gen_inv_idx(counter, is_memset);
if (actual != expected) {
if (error_count < MAX_ERROR_COUNT)
dmatest_mismatch(actual, pattern, i,
counter, is_srcbuf,
is_memset);
error_count++;
}
counter++;
}
}
if (error_count > MAX_ERROR_COUNT)
pr_warn("%s: %u errors suppressed\n",
current->comm, error_count - MAX_ERROR_COUNT);
return error_count;
}
static void dmatest_callback(void *arg)
{
struct dmatest_done *done = arg;
struct dmatest_thread *thread =
container_of(done, struct dmatest_thread, test_done);
if (!thread->done) {
done->done = true;
wake_up_all(done->wait);
} else {
/*
* If thread->done, it means that this callback occurred
* after the parent thread has cleaned up. This can
* happen in the case that driver doesn't implement
* the terminate_all() functionality and a dma operation
* did not occur within the timeout period
*/
WARN(1, "dmatest: Kernel memory may be corrupted!!\n");
}
}
static unsigned int min_odd(unsigned int x, unsigned int y)
{
unsigned int val = min(x, y);
return val % 2 ? val : val - 1;
}
static void result(const char *err, unsigned int n, unsigned int src_off,
unsigned int dst_off, unsigned int len, unsigned long data)
{
if (IS_ERR_VALUE(data)) {
pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%ld)\n",
current->comm, n, err, src_off, dst_off, len, data);
} else {
pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
current->comm, n, err, src_off, dst_off, len, data);
}
}
static void dbg_result(const char *err, unsigned int n, unsigned int src_off,
unsigned int dst_off, unsigned int len,
unsigned long data)
{
pr_debug("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
current->comm, n, err, src_off, dst_off, len, data);
}
#define verbose_result(err, n, src_off, dst_off, len, data) ({ \
if (verbose) \
result(err, n, src_off, dst_off, len, data); \
else \
dbg_result(err, n, src_off, dst_off, len, data);\
})
static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
{
unsigned long long per_sec = 1000000;
if (runtime <= 0)
return 0;
/* drop precision until runtime is 32-bits */
while (runtime > UINT_MAX) {
runtime >>= 1;
per_sec <<= 1;
}
per_sec *= val;
per_sec = INT_TO_FIXPT(per_sec);
do_div(per_sec, runtime);
return per_sec;
}
static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
{
return FIXPT_TO_INT(dmatest_persec(runtime, len >> 10));
}
static void __dmatest_free_test_data(struct dmatest_data *d, unsigned int cnt)
{
unsigned int i;
for (i = 0; i < cnt; i++)
kfree(d->raw[i]);
kfree(d->aligned);
kfree(d->raw);
}
static void dmatest_free_test_data(struct dmatest_data *d)
{
__dmatest_free_test_data(d, d->cnt);
}
static int dmatest_alloc_test_data(struct dmatest_data *d,
unsigned int buf_size, u8 align)
{
unsigned int i = 0;
d->raw = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
if (!d->raw)
return -ENOMEM;
d->aligned = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL);
if (!d->aligned)
goto err;
for (i = 0; i < d->cnt; i++) {
d->raw[i] = kmalloc(buf_size + align, GFP_KERNEL);
if (!d->raw[i])
goto err;
/* align to alignment restriction */
if (align)
d->aligned[i] = PTR_ALIGN(d->raw[i], align);
else
d->aligned[i] = d->raw[i];
}
return 0;
err:
__dmatest_free_test_data(d, i);
return -ENOMEM;
}
/*
* This function repeatedly tests DMA transfers of various lengths and
* offsets for a given operation type until it is told to exit by
* kthread_stop(). There may be multiple threads running this function
* in parallel for a single channel, and there may be multiple channels
* being tested in parallel.
*
* Before each test, the source and destination buffer is initialized
* with a known pattern. This pattern is different depending on
* whether it's in an area which is supposed to be copied or
* overwritten, and different in the source and destination buffers.
* So if the DMA engine doesn't copy exactly what we tell it to copy,
* we'll notice.
*/
static int dmatest_func(void *data)
{
struct dmatest_thread *thread = data;
struct dmatest_done *done = &thread->test_done;
struct dmatest_info *info;
struct dmatest_params *params;
struct dma_chan *chan;
struct dma_device *dev;
struct device *dma_dev;
unsigned int error_count;
unsigned int failed_tests = 0;
unsigned int total_tests = 0;
dma_cookie_t cookie;
enum dma_status status;
enum dma_ctrl_flags flags;
u8 *pq_coefs = NULL;
int ret;
unsigned int buf_size;
struct dmatest_data *src;
struct dmatest_data *dst;
int i;
ktime_t ktime, start, diff;
ktime_t filltime = 0;
ktime_t comparetime = 0;
s64 runtime = 0;
unsigned long long total_len = 0;
unsigned long long iops = 0;
u8 align = 0;
bool is_memset = false;
dma_addr_t *srcs;
dma_addr_t *dma_pq;
set_freezable();
ret = -ENOMEM;
smp_rmb();
thread->pending = false;
info = thread->info;
params = &info->params;
chan = thread->chan;
dev = chan->device;
dma_dev = dmaengine_get_dma_device(chan);
src = &thread->src;
dst = &thread->dst;
if (thread->type == DMA_MEMCPY) {
align = params->alignment < 0 ? dev->copy_align :
params->alignment;
src->cnt = dst->cnt = 1;
} else if (thread->type == DMA_MEMSET) {
align = params->alignment < 0 ? dev->fill_align :
params->alignment;
src->cnt = dst->cnt = 1;
is_memset = true;
} else if (thread->type == DMA_XOR) {
/* force odd to ensure dst = src */
src->cnt = min_odd(params->xor_sources | 1, dev->max_xor);
dst->cnt = 1;
align = params->alignment < 0 ? dev->xor_align :
params->alignment;
} else if (thread->type == DMA_PQ) {
/* force odd to ensure dst = src */
src->cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
dst->cnt = 2;
align = params->alignment < 0 ? dev->pq_align :
params->alignment;
pq_coefs = kmalloc(params->pq_sources + 1, GFP_KERNEL);
if (!pq_coefs)
goto err_thread_type;
for (i = 0; i < src->cnt; i++)
pq_coefs[i] = 1;
} else
goto err_thread_type;
/* Check if buffer count fits into map count variable (u8) */
if ((src->cnt + dst->cnt) >= 255) {
pr_err("too many buffers (%d of 255 supported)\n",
src->cnt + dst->cnt);
goto err_free_coefs;
}
buf_size = params->buf_size;
if (1 << align > buf_size) {
pr_err("%u-byte buffer too small for %d-byte alignment\n",
buf_size, 1 << align);
goto err_free_coefs;
}
if (dmatest_alloc_test_data(src, buf_size, align) < 0)
goto err_free_coefs;
if (dmatest_alloc_test_data(dst, buf_size, align) < 0)
goto err_src;
set_user_nice(current, 10);
srcs = kcalloc(src->cnt, sizeof(dma_addr_t), GFP_KERNEL);
if (!srcs)
goto err_dst;
dma_pq = kcalloc(dst->cnt, sizeof(dma_addr_t), GFP_KERNEL);
if (!dma_pq)
goto err_srcs_array;
/*
* src and dst buffers are freed by ourselves below
*/
if (params->polled)
flags = DMA_CTRL_ACK;
else
flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
ktime = ktime_get();
while (!(kthread_should_stop() ||
(params->iterations && total_tests >= params->iterations))) {
struct dma_async_tx_descriptor *tx = NULL;
struct dmaengine_unmap_data *um;
dma_addr_t *dsts;
unsigned int len;
total_tests++;
if (params->transfer_size) {
if (params->transfer_size >= buf_size) {
pr_err("%u-byte transfer size must be lower than %u-buffer size\n",
params->transfer_size, buf_size);
break;
}
len = params->transfer_size;
} else if (params->norandom) {
len = buf_size;
} else {
len = dmatest_random() % buf_size + 1;
}
/* Do not alter transfer size explicitly defined by user */
if (!params->transfer_size) {
len = (len >> align) << align;
if (!len)
len = 1 << align;
}
total_len += len;
if (params->norandom) {
src->off = 0;
dst->off = 0;
} else {
src->off = dmatest_random() % (buf_size - len + 1);
dst->off = dmatest_random() % (buf_size - len + 1);
src->off = (src->off >> align) << align;
dst->off = (dst->off >> align) << align;
}
if (!params->noverify) {
start = ktime_get();
dmatest_init_srcs(src->aligned, src->off, len,
buf_size, is_memset);
dmatest_init_dsts(dst->aligned, dst->off, len,
buf_size, is_memset);
diff = ktime_sub(ktime_get(), start);
filltime = ktime_add(filltime, diff);
}
um = dmaengine_get_unmap_data(dma_dev, src->cnt + dst->cnt,
GFP_KERNEL);
if (!um) {
failed_tests++;
result("unmap data NULL", total_tests,
src->off, dst->off, len, ret);
continue;
}
um->len = buf_size;
for (i = 0; i < src->cnt; i++) {
void *buf = src->aligned[i];
struct page *pg = virt_to_page(buf);
unsigned long pg_off = offset_in_page(buf);
um->addr[i] = dma_map_page(dma_dev, pg, pg_off,
um->len, DMA_TO_DEVICE);
srcs[i] = um->addr[i] + src->off;
ret = dma_mapping_error(dma_dev, um->addr[i]);
if (ret) {
result("src mapping error", total_tests,
src->off, dst->off, len, ret);
goto error_unmap_continue;
}
um->to_cnt++;
}
/* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
dsts = &um->addr[src->cnt];
for (i = 0; i < dst->cnt; i++) {
void *buf = dst->aligned[i];
struct page *pg = virt_to_page(buf);
unsigned long pg_off = offset_in_page(buf);
dsts[i] = dma_map_page(dma_dev, pg, pg_off, um->len,
DMA_BIDIRECTIONAL);
ret = dma_mapping_error(dma_dev, dsts[i]);
if (ret) {
result("dst mapping error", total_tests,
src->off, dst->off, len, ret);
goto error_unmap_continue;
}
um->bidi_cnt++;
}
if (thread->type == DMA_MEMCPY)
tx = dev->device_prep_dma_memcpy(chan,
dsts[0] + dst->off,
srcs[0], len, flags);
else if (thread->type == DMA_MEMSET)
tx = dev->device_prep_dma_memset(chan,
dsts[0] + dst->off,
*(src->aligned[0] + src->off),
len, flags);
else if (thread->type == DMA_XOR)
tx = dev->device_prep_dma_xor(chan,
dsts[0] + dst->off,
srcs, src->cnt,
len, flags);
else if (thread->type == DMA_PQ) {
for (i = 0; i < dst->cnt; i++)
dma_pq[i] = dsts[i] + dst->off;
tx = dev->device_prep_dma_pq(chan, dma_pq, srcs,
src->cnt, pq_coefs,
len, flags);
}
if (!tx) {
result("prep error", total_tests, src->off,
dst->off, len, ret);
msleep(100);
goto error_unmap_continue;
}
done->done = false;
if (!params->polled) {
tx->callback = dmatest_callback;
tx->callback_param = done;
}
cookie = tx->tx_submit(tx);
if (dma_submit_error(cookie)) {
result("submit error", total_tests, src->off,
dst->off, len, ret);
msleep(100);
goto error_unmap_continue;
}
if (params->polled) {
status = dma_sync_wait(chan, cookie);
dmaengine_terminate_sync(chan);
if (status == DMA_COMPLETE)
done->done = true;
} else {
dma_async_issue_pending(chan);
wait_event_freezable_timeout(thread->done_wait,
done->done,
msecs_to_jiffies(params->timeout));
status = dma_async_is_tx_complete(chan, cookie, NULL,
NULL);
}
if (!done->done) {
result("test timed out", total_tests, src->off, dst->off,
len, 0);
goto error_unmap_continue;
} else if (status != DMA_COMPLETE &&
!(dma_has_cap(DMA_COMPLETION_NO_ORDER,
dev->cap_mask) &&
status == DMA_OUT_OF_ORDER)) {
result(status == DMA_ERROR ?
"completion error status" :
"completion busy status", total_tests, src->off,
dst->off, len, ret);
goto error_unmap_continue;
}
dmaengine_unmap_put(um);
if (params->noverify) {
verbose_result("test passed", total_tests, src->off,
dst->off, len, 0);
continue;
}
start = ktime_get();
pr_debug("%s: verifying source buffer...\n", current->comm);
error_count = dmatest_verify(src->aligned, 0, src->off,
0, PATTERN_SRC, true, is_memset);
error_count += dmatest_verify(src->aligned, src->off,
src->off + len, src->off,
PATTERN_SRC | PATTERN_COPY, true, is_memset);
error_count += dmatest_verify(src->aligned, src->off + len,
buf_size, src->off + len,
PATTERN_SRC, true, is_memset);
pr_debug("%s: verifying dest buffer...\n", current->comm);
error_count += dmatest_verify(dst->aligned, 0, dst->off,
0, PATTERN_DST, false, is_memset);
error_count += dmatest_verify(dst->aligned, dst->off,
dst->off + len, src->off,
PATTERN_SRC | PATTERN_COPY, false, is_memset);
error_count += dmatest_verify(dst->aligned, dst->off + len,
buf_size, dst->off + len,
PATTERN_DST, false, is_memset);
diff = ktime_sub(ktime_get(), start);
comparetime = ktime_add(comparetime, diff);
if (error_count) {
result("data error", total_tests, src->off, dst->off,
len, error_count);
failed_tests++;
} else {
verbose_result("test passed", total_tests, src->off,
dst->off, len, 0);
}
continue;
error_unmap_continue:
dmaengine_unmap_put(um);
failed_tests++;
}
ktime = ktime_sub(ktime_get(), ktime);
ktime = ktime_sub(ktime, comparetime);
ktime = ktime_sub(ktime, filltime);
runtime = ktime_to_us(ktime);
ret = 0;
kfree(dma_pq);
err_srcs_array:
kfree(srcs);
err_dst:
dmatest_free_test_data(dst);
err_src:
dmatest_free_test_data(src);
err_free_coefs:
kfree(pq_coefs);
err_thread_type:
iops = dmatest_persec(runtime, total_tests);
pr_info("%s: summary %u tests, %u failures %llu.%02llu iops %llu KB/s (%d)\n",
current->comm, total_tests, failed_tests,
FIXPT_TO_INT(iops), FIXPT_GET_FRAC(iops),
dmatest_KBs(runtime, total_len), ret);
/* terminate all transfers on specified channels */
if (ret || failed_tests)
dmaengine_terminate_sync(chan);
thread->done = true;
wake_up(&thread_wait);
return ret;
}
static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
{
struct dmatest_thread *thread;
struct dmatest_thread *_thread;
int ret;
list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
ret = kthread_stop(thread->task);
pr_debug("thread %s exited with status %d\n",
thread->task->comm, ret);
list_del(&thread->node);
put_task_struct(thread->task);
kfree(thread);
}
/* terminate all transfers on specified channels */
dmaengine_terminate_sync(dtc->chan);
kfree(dtc);
}
static int dmatest_add_threads(struct dmatest_info *info,
struct dmatest_chan *dtc, enum dma_transaction_type type)
{
struct dmatest_params *params = &info->params;
struct dmatest_thread *thread;
struct dma_chan *chan = dtc->chan;
char *op;
unsigned int i;
if (type == DMA_MEMCPY)
op = "copy";
else if (type == DMA_MEMSET)
op = "set";
else if (type == DMA_XOR)
op = "xor";
else if (type == DMA_PQ)
op = "pq";
else
return -EINVAL;
for (i = 0; i < params->threads_per_chan; i++) {
thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
if (!thread) {
pr_warn("No memory for %s-%s%u\n",
dma_chan_name(chan), op, i);
break;
}
thread->info = info;
thread->chan = dtc->chan;
thread->type = type;
thread->test_done.wait = &thread->done_wait;
init_waitqueue_head(&thread->done_wait);
smp_wmb();
thread->task = kthread_create(dmatest_func, thread, "%s-%s%u",
dma_chan_name(chan), op, i);
if (IS_ERR(thread->task)) {
pr_warn("Failed to create thread %s-%s%u\n",
dma_chan_name(chan), op, i);
kfree(thread);
break;
}
/* srcbuf and dstbuf are allocated by the thread itself */
get_task_struct(thread->task);
list_add_tail(&thread->node, &dtc->threads);
thread->pending = true;
}
return i;
}
static int dmatest_add_channel(struct dmatest_info *info,
struct dma_chan *chan)
{
struct dmatest_chan *dtc;
struct dma_device *dma_dev = chan->device;
unsigned int thread_count = 0;
int cnt;
dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
if (!dtc) {
pr_warn("No memory for %s\n", dma_chan_name(chan));
return -ENOMEM;
}
dtc->chan = chan;
INIT_LIST_HEAD(&dtc->threads);
if (dma_has_cap(DMA_COMPLETION_NO_ORDER, dma_dev->cap_mask) &&
info->params.polled) {
info->params.polled = false;
pr_warn("DMA_COMPLETION_NO_ORDER, polled disabled\n");
}
if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
if (dmatest == 0) {
cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
thread_count += cnt > 0 ? cnt : 0;
}
}
if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) {
if (dmatest == 1) {
cnt = dmatest_add_threads(info, dtc, DMA_MEMSET);
thread_count += cnt > 0 ? cnt : 0;
}
}
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
cnt = dmatest_add_threads(info, dtc, DMA_XOR);
thread_count += cnt > 0 ? cnt : 0;
}
if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
cnt = dmatest_add_threads(info, dtc, DMA_PQ);
thread_count += cnt > 0 ? cnt : 0;
}
pr_info("Added %u threads using %s\n",
thread_count, dma_chan_name(chan));
list_add_tail(&dtc->node, &info->channels);
info->nr_channels++;
return 0;
}
static bool filter(struct dma_chan *chan, void *param)
{
return dmatest_match_channel(param, chan) && dmatest_match_device(param, chan->device);
}
static void request_channels(struct dmatest_info *info,
enum dma_transaction_type type)
{
dma_cap_mask_t mask;
dma_cap_zero(mask);
dma_cap_set(type, mask);
for (;;) {
struct dmatest_params *params = &info->params;
struct dma_chan *chan;
chan = dma_request_channel(mask, filter, params);
if (chan) {
if (dmatest_add_channel(info, chan)) {
dma_release_channel(chan);
break; /* add_channel failed, punt */
}
} else
break; /* no more channels available */
if (params->max_channels &&
info->nr_channels >= params->max_channels)
break; /* we have all we need */
}
}
static void add_threaded_test(struct dmatest_info *info)
{
struct dmatest_params *params = &info->params;
/* Copy test parameters */
params->buf_size = test_buf_size;
strscpy(params->channel, strim(test_channel), sizeof(params->channel));
strscpy(params->device, strim(test_device), sizeof(params->device));
params->threads_per_chan = threads_per_chan;
params->max_channels = max_channels;
params->iterations = iterations;
params->xor_sources = xor_sources;
params->pq_sources = pq_sources;
params->timeout = timeout;
params->noverify = noverify;
params->norandom = norandom;
params->alignment = alignment;
params->transfer_size = transfer_size;
params->polled = polled;
request_channels(info, DMA_MEMCPY);
request_channels(info, DMA_MEMSET);
request_channels(info, DMA_XOR);
request_channels(info, DMA_PQ);
}
static void run_pending_tests(struct dmatest_info *info)
{
struct dmatest_chan *dtc;
unsigned int thread_count = 0;
list_for_each_entry(dtc, &info->channels, node) {
struct dmatest_thread *thread;
thread_count = 0;
list_for_each_entry(thread, &dtc->threads, node) {
wake_up_process(thread->task);
thread_count++;
}
pr_info("Started %u threads using %s\n",
thread_count, dma_chan_name(dtc->chan));
}
}
static void stop_threaded_test(struct dmatest_info *info)
{
struct dmatest_chan *dtc, *_dtc;
struct dma_chan *chan;
list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
list_del(&dtc->node);
chan = dtc->chan;
dmatest_cleanup_channel(dtc);
pr_debug("dropped channel %s\n", dma_chan_name(chan));
dma_release_channel(chan);
}
info->nr_channels = 0;
}
static void start_threaded_tests(struct dmatest_info *info)
{
/* we might be called early to set run=, defer running until all
* parameters have been evaluated
*/
if (!info->did_init)
return;
run_pending_tests(info);
}
static int dmatest_run_get(char *val, const struct kernel_param *kp)
{
struct dmatest_info *info = &test_info;
mutex_lock(&info->lock);
if (is_threaded_test_run(info)) {
dmatest_run = true;
} else {
if (!is_threaded_test_pending(info))
stop_threaded_test(info);
dmatest_run = false;
}
mutex_unlock(&info->lock);
return param_get_bool(val, kp);
}
static int dmatest_run_set(const char *val, const struct kernel_param *kp)
{
struct dmatest_info *info = &test_info;
int ret;
mutex_lock(&info->lock);
ret = param_set_bool(val, kp);
if (ret) {
mutex_unlock(&info->lock);
return ret;
} else if (dmatest_run) {
if (!is_threaded_test_pending(info)) {
/*
* We have nothing to run. This can be due to:
*/
ret = info->last_error;
if (ret) {
/* 1) Misconfiguration */
pr_err("Channel misconfigured, can't continue\n");
mutex_unlock(&info->lock);
return ret;
} else {
/* 2) We rely on defaults */
pr_info("No channels configured, continue with any\n");
if (!is_threaded_test_run(info))
stop_threaded_test(info);
add_threaded_test(info);
}
}
start_threaded_tests(info);
} else {
stop_threaded_test(info);
}
mutex_unlock(&info->lock);
return ret;
}
static int dmatest_chan_set(const char *val, const struct kernel_param *kp)
{
struct dmatest_info *info = &test_info;
struct dmatest_chan *dtc;
char chan_reset_val[20];
int ret;
mutex_lock(&info->lock);
ret = param_set_copystring(val, kp);
if (ret) {
mutex_unlock(&info->lock);
return ret;
}
/*Clear any previously run threads */
if (!is_threaded_test_run(info) && !is_threaded_test_pending(info))
stop_threaded_test(info);
/* Reject channels that are already registered */
if (is_threaded_test_pending(info)) {
list_for_each_entry(dtc, &info->channels, node) {
if (strcmp(dma_chan_name(dtc->chan),
strim(test_channel)) == 0) {
dtc = list_last_entry(&info->channels,
struct dmatest_chan,
node);
strscpy(chan_reset_val,
dma_chan_name(dtc->chan),
sizeof(chan_reset_val));
ret = -EBUSY;
goto add_chan_err;
}
}
}
add_threaded_test(info);
/* Check if channel was added successfully */
if (!list_empty(&info->channels)) {
/*
* if new channel was not successfully added, revert the
* "test_channel" string to the name of the last successfully
* added channel. exception for when users issues empty string
* to channel parameter.
*/
dtc = list_last_entry(&info->channels, struct dmatest_chan, node);
if ((strcmp(dma_chan_name(dtc->chan), strim(test_channel)) != 0)
&& (strcmp("", strim(test_channel)) != 0)) {
ret = -EINVAL;
strscpy(chan_reset_val, dma_chan_name(dtc->chan),
sizeof(chan_reset_val));
goto add_chan_err;
}
} else {
/* Clear test_channel if no channels were added successfully */
strscpy(chan_reset_val, "", sizeof(chan_reset_val));
ret = -EBUSY;
goto add_chan_err;
}
info->last_error = ret;
mutex_unlock(&info->lock);
return ret;
add_chan_err:
param_set_copystring(chan_reset_val, kp);
info->last_error = ret;
mutex_unlock(&info->lock);
return ret;
}
static int dmatest_chan_get(char *val, const struct kernel_param *kp)
{
struct dmatest_info *info = &test_info;
mutex_lock(&info->lock);
if (!is_threaded_test_run(info) && !is_threaded_test_pending(info)) {
stop_threaded_test(info);
strscpy(test_channel, "", sizeof(test_channel));
}
mutex_unlock(&info->lock);
return param_get_string(val, kp);
}
static int dmatest_test_list_get(char *val, const struct kernel_param *kp)
{
struct dmatest_info *info = &test_info;
struct dmatest_chan *dtc;
unsigned int thread_count = 0;
list_for_each_entry(dtc, &info->channels, node) {
struct dmatest_thread *thread;
thread_count = 0;
list_for_each_entry(thread, &dtc->threads, node) {
thread_count++;
}
pr_info("%u threads using %s\n",
thread_count, dma_chan_name(dtc->chan));
}
return 0;
}
static int __init dmatest_init(void)
{
struct dmatest_info *info = &test_info;
struct dmatest_params *params = &info->params;
if (dmatest_run) {
mutex_lock(&info->lock);
add_threaded_test(info);
run_pending_tests(info);
mutex_unlock(&info->lock);
}
if (params->iterations && wait)
wait_event(thread_wait, !is_threaded_test_run(info));
/* module parameters are stable, inittime tests are started,
* let userspace take over 'run' control
*/
info->did_init = true;
return 0;
}
/* when compiled-in wait for drivers to load first */
late_initcall(dmatest_init);
static void __exit dmatest_exit(void)
{
struct dmatest_info *info = &test_info;
mutex_lock(&info->lock);
stop_threaded_test(info);
mutex_unlock(&info->lock);
}
module_exit(dmatest_exit);
MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/dmatest.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* ADMA driver for Nvidia's Tegra210 ADMA controller.
*
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/clk.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "virt-dma.h"
#define ADMA_CH_CMD 0x00
#define ADMA_CH_STATUS 0x0c
#define ADMA_CH_STATUS_XFER_EN BIT(0)
#define ADMA_CH_STATUS_XFER_PAUSED BIT(1)
#define ADMA_CH_INT_STATUS 0x10
#define ADMA_CH_INT_STATUS_XFER_DONE BIT(0)
#define ADMA_CH_INT_CLEAR 0x1c
#define ADMA_CH_CTRL 0x24
#define ADMA_CH_CTRL_DIR(val) (((val) & 0xf) << 12)
#define ADMA_CH_CTRL_DIR_AHUB2MEM 2
#define ADMA_CH_CTRL_DIR_MEM2AHUB 4
#define ADMA_CH_CTRL_MODE_CONTINUOUS (2 << 8)
#define ADMA_CH_CTRL_FLOWCTRL_EN BIT(1)
#define ADMA_CH_CTRL_XFER_PAUSE_SHIFT 0
#define ADMA_CH_CONFIG 0x28
#define ADMA_CH_CONFIG_SRC_BUF(val) (((val) & 0x7) << 28)
#define ADMA_CH_CONFIG_TRG_BUF(val) (((val) & 0x7) << 24)
#define ADMA_CH_CONFIG_BURST_SIZE_SHIFT 20
#define ADMA_CH_CONFIG_MAX_BURST_SIZE 16
#define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf)
#define ADMA_CH_CONFIG_MAX_BUFS 8
#define TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(reqs) (reqs << 4)
#define ADMA_CH_FIFO_CTRL 0x2c
#define ADMA_CH_TX_FIFO_SIZE_SHIFT 8
#define ADMA_CH_RX_FIFO_SIZE_SHIFT 0
#define ADMA_CH_LOWER_SRC_ADDR 0x34
#define ADMA_CH_LOWER_TRG_ADDR 0x3c
#define ADMA_CH_TC 0x44
#define ADMA_CH_TC_COUNT_MASK 0x3ffffffc
#define ADMA_CH_XFER_STATUS 0x54
#define ADMA_CH_XFER_STATUS_COUNT_MASK 0xffff
#define ADMA_GLOBAL_CMD 0x00
#define ADMA_GLOBAL_SOFT_RESET 0x04
#define TEGRA_ADMA_BURST_COMPLETE_TIME 20
#define ADMA_CH_REG_FIELD_VAL(val, mask, shift) (((val) & mask) << shift)
struct tegra_adma;
/*
* struct tegra_adma_chip_data - Tegra chip specific data
* @adma_get_burst_config: Function callback used to set DMA burst size.
* @global_reg_offset: Register offset of DMA global register.
* @global_int_clear: Register offset of DMA global interrupt clear.
* @ch_req_tx_shift: Register offset for AHUB transmit channel select.
* @ch_req_rx_shift: Register offset for AHUB receive channel select.
* @ch_base_offset: Register offset of DMA channel registers.
* @ch_fifo_ctrl: Default value for channel FIFO CTRL register.
* @ch_req_mask: Mask for Tx or Rx channel select.
* @ch_req_max: Maximum number of Tx or Rx channels available.
* @ch_reg_size: Size of DMA channel register space.
* @nr_channels: Number of DMA channels available.
* @ch_fifo_size_mask: Mask for FIFO size field.
* @sreq_index_offset: Slave channel index offset.
* @has_outstanding_reqs: If DMA channel can have outstanding requests.
*/
struct tegra_adma_chip_data {
unsigned int (*adma_get_burst_config)(unsigned int burst_size);
unsigned int global_reg_offset;
unsigned int global_int_clear;
unsigned int ch_req_tx_shift;
unsigned int ch_req_rx_shift;
unsigned int ch_base_offset;
unsigned int ch_fifo_ctrl;
unsigned int ch_req_mask;
unsigned int ch_req_max;
unsigned int ch_reg_size;
unsigned int nr_channels;
unsigned int ch_fifo_size_mask;
unsigned int sreq_index_offset;
bool has_outstanding_reqs;
};
/*
* struct tegra_adma_chan_regs - Tegra ADMA channel registers
*/
struct tegra_adma_chan_regs {
unsigned int ctrl;
unsigned int config;
unsigned int src_addr;
unsigned int trg_addr;
unsigned int fifo_ctrl;
unsigned int cmd;
unsigned int tc;
};
/*
* struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests.
*/
struct tegra_adma_desc {
struct virt_dma_desc vd;
struct tegra_adma_chan_regs ch_regs;
size_t buf_len;
size_t period_len;
size_t num_periods;
};
/*
* struct tegra_adma_chan - Tegra ADMA channel information
*/
struct tegra_adma_chan {
struct virt_dma_chan vc;
struct tegra_adma_desc *desc;
struct tegra_adma *tdma;
int irq;
void __iomem *chan_addr;
/* Slave channel configuration info */
struct dma_slave_config sconfig;
enum dma_transfer_direction sreq_dir;
unsigned int sreq_index;
bool sreq_reserved;
struct tegra_adma_chan_regs ch_regs;
/* Transfer count and position info */
unsigned int tx_buf_count;
unsigned int tx_buf_pos;
};
/*
* struct tegra_adma - Tegra ADMA controller information
*/
struct tegra_adma {
struct dma_device dma_dev;
struct device *dev;
void __iomem *base_addr;
struct clk *ahub_clk;
unsigned int nr_channels;
unsigned long rx_requests_reserved;
unsigned long tx_requests_reserved;
/* Used to store global command register state when suspending */
unsigned int global_cmd;
const struct tegra_adma_chip_data *cdata;
/* Last member of the structure */
struct tegra_adma_chan channels[];
};
static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
{
writel(val, tdma->base_addr + tdma->cdata->global_reg_offset + reg);
}
static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
{
return readl(tdma->base_addr + tdma->cdata->global_reg_offset + reg);
}
static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
{
writel(val, tdc->chan_addr + reg);
}
static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
{
return readl(tdc->chan_addr + reg);
}
static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc)
{
return container_of(dc, struct tegra_adma_chan, vc.chan);
}
static inline struct tegra_adma_desc *to_tegra_adma_desc(
struct dma_async_tx_descriptor *td)
{
return container_of(td, struct tegra_adma_desc, vd.tx);
}
static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
{
return tdc->tdma->dev;
}
static void tegra_adma_desc_free(struct virt_dma_desc *vd)
{
kfree(container_of(vd, struct tegra_adma_desc, vd));
}
static int tegra_adma_slave_config(struct dma_chan *dc,
struct dma_slave_config *sconfig)
{
struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig));
return 0;
}
static int tegra_adma_init(struct tegra_adma *tdma)
{
u32 status;
int ret;
/* Clear any interrupts */
tdma_write(tdma, tdma->cdata->ch_base_offset + tdma->cdata->global_int_clear, 0x1);
/* Assert soft reset */
tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
/* Wait for reset to clear */
ret = readx_poll_timeout(readl,
tdma->base_addr +
tdma->cdata->global_reg_offset +
ADMA_GLOBAL_SOFT_RESET,
status, status == 0, 20, 10000);
if (ret)
return ret;
/* Enable global ADMA registers */
tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
return 0;
}
static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc,
enum dma_transfer_direction direction)
{
struct tegra_adma *tdma = tdc->tdma;
unsigned int sreq_index = tdc->sreq_index;
if (tdc->sreq_reserved)
return tdc->sreq_dir == direction ? 0 : -EINVAL;
if (sreq_index > tdma->cdata->ch_req_max) {
dev_err(tdma->dev, "invalid DMA request\n");
return -EINVAL;
}
switch (direction) {
case DMA_MEM_TO_DEV:
if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) {
dev_err(tdma->dev, "DMA request reserved\n");
return -EINVAL;
}
break;
case DMA_DEV_TO_MEM:
if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) {
dev_err(tdma->dev, "DMA request reserved\n");
return -EINVAL;
}
break;
default:
dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
dma_chan_name(&tdc->vc.chan));
return -EINVAL;
}
tdc->sreq_dir = direction;
tdc->sreq_reserved = true;
return 0;
}
static void tegra_adma_request_free(struct tegra_adma_chan *tdc)
{
struct tegra_adma *tdma = tdc->tdma;
if (!tdc->sreq_reserved)
return;
switch (tdc->sreq_dir) {
case DMA_MEM_TO_DEV:
clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved);
break;
case DMA_DEV_TO_MEM:
clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved);
break;
default:
dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
dma_chan_name(&tdc->vc.chan));
return;
}
tdc->sreq_reserved = false;
}
static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc)
{
u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS);
return status & ADMA_CH_INT_STATUS_XFER_DONE;
}
static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc)
{
u32 status = tegra_adma_irq_status(tdc);
if (status)
tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status);
return status;
}
static void tegra_adma_stop(struct tegra_adma_chan *tdc)
{
unsigned int status;
/* Disable ADMA */
tdma_ch_write(tdc, ADMA_CH_CMD, 0);
/* Clear interrupt status */
tegra_adma_irq_clear(tdc);
if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS,
status, !(status & ADMA_CH_STATUS_XFER_EN),
20, 10000)) {
dev_err(tdc2dev(tdc), "unable to stop DMA channel\n");
return;
}
kfree(tdc->desc);
tdc->desc = NULL;
}
static void tegra_adma_start(struct tegra_adma_chan *tdc)
{
struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc);
struct tegra_adma_chan_regs *ch_regs;
struct tegra_adma_desc *desc;
if (!vd)
return;
list_del(&vd->node);
desc = to_tegra_adma_desc(&vd->tx);
if (!desc) {
dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n");
return;
}
ch_regs = &desc->ch_regs;
tdc->tx_buf_pos = 0;
tdc->tx_buf_count = 0;
tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc);
tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr);
tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr);
tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl);
tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config);
/* Start ADMA */
tdma_ch_write(tdc, ADMA_CH_CMD, 1);
tdc->desc = desc;
}
static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc)
{
struct tegra_adma_desc *desc = tdc->desc;
unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1;
unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS);
unsigned int periods_remaining;
/*
* Handle wrap around of buffer count register
*/
if (pos < tdc->tx_buf_pos)
tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos);
else
tdc->tx_buf_count += pos - tdc->tx_buf_pos;
periods_remaining = tdc->tx_buf_count % desc->num_periods;
tdc->tx_buf_pos = pos;
return desc->buf_len - (periods_remaining * desc->period_len);
}
static irqreturn_t tegra_adma_isr(int irq, void *dev_id)
{
struct tegra_adma_chan *tdc = dev_id;
unsigned long status;
spin_lock(&tdc->vc.lock);
status = tegra_adma_irq_clear(tdc);
if (status == 0 || !tdc->desc) {
spin_unlock(&tdc->vc.lock);
return IRQ_NONE;
}
vchan_cyclic_callback(&tdc->desc->vd);
spin_unlock(&tdc->vc.lock);
return IRQ_HANDLED;
}
static void tegra_adma_issue_pending(struct dma_chan *dc)
{
struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
unsigned long flags;
spin_lock_irqsave(&tdc->vc.lock, flags);
if (vchan_issue_pending(&tdc->vc)) {
if (!tdc->desc)
tegra_adma_start(tdc);
}
spin_unlock_irqrestore(&tdc->vc.lock, flags);
}
static bool tegra_adma_is_paused(struct tegra_adma_chan *tdc)
{
u32 csts;
csts = tdma_ch_read(tdc, ADMA_CH_STATUS);
csts &= ADMA_CH_STATUS_XFER_PAUSED;
return csts ? true : false;
}
static int tegra_adma_pause(struct dma_chan *dc)
{
struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
struct tegra_adma_desc *desc = tdc->desc;
struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
int dcnt = 10;
ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
ch_regs->ctrl |= (1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
while (dcnt-- && !tegra_adma_is_paused(tdc))
udelay(TEGRA_ADMA_BURST_COMPLETE_TIME);
if (dcnt < 0) {
dev_err(tdc2dev(tdc), "unable to pause DMA channel\n");
return -EBUSY;
}
return 0;
}
static int tegra_adma_resume(struct dma_chan *dc)
{
struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
struct tegra_adma_desc *desc = tdc->desc;
struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
ch_regs->ctrl &= ~(1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
return 0;
}
static int tegra_adma_terminate_all(struct dma_chan *dc)
{
struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&tdc->vc.lock, flags);
if (tdc->desc)
tegra_adma_stop(tdc);
tegra_adma_request_free(tdc);
vchan_get_all_descriptors(&tdc->vc, &head);
spin_unlock_irqrestore(&tdc->vc.lock, flags);
vchan_dma_desc_free_list(&tdc->vc, &head);
return 0;
}
static enum dma_status tegra_adma_tx_status(struct dma_chan *dc,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
struct tegra_adma_desc *desc;
struct virt_dma_desc *vd;
enum dma_status ret;
unsigned long flags;
unsigned int residual;
ret = dma_cookie_status(dc, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&tdc->vc.lock, flags);
vd = vchan_find_desc(&tdc->vc, cookie);
if (vd) {
desc = to_tegra_adma_desc(&vd->tx);
residual = desc->ch_regs.tc;
} else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) {
residual = tegra_adma_get_residue(tdc);
} else {
residual = 0;
}
spin_unlock_irqrestore(&tdc->vc.lock, flags);
dma_set_residue(txstate, residual);
return ret;
}
static unsigned int tegra210_adma_get_burst_config(unsigned int burst_size)
{
if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
return fls(burst_size) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
}
static unsigned int tegra186_adma_get_burst_config(unsigned int burst_size)
{
if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
return (burst_size - 1) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
}
static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
struct tegra_adma_desc *desc,
dma_addr_t buf_addr,
enum dma_transfer_direction direction)
{
struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
const struct tegra_adma_chip_data *cdata = tdc->tdma->cdata;
unsigned int burst_size, adma_dir, fifo_size_shift;
if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
return -EINVAL;
switch (direction) {
case DMA_MEM_TO_DEV:
fifo_size_shift = ADMA_CH_TX_FIFO_SIZE_SHIFT;
adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB;
burst_size = tdc->sconfig.dst_maxburst;
ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1);
ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
cdata->ch_req_mask,
cdata->ch_req_tx_shift);
ch_regs->src_addr = buf_addr;
break;
case DMA_DEV_TO_MEM:
fifo_size_shift = ADMA_CH_RX_FIFO_SIZE_SHIFT;
adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
burst_size = tdc->sconfig.src_maxburst;
ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
cdata->ch_req_mask,
cdata->ch_req_rx_shift);
ch_regs->trg_addr = buf_addr;
break;
default:
dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
return -EINVAL;
}
ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) |
ADMA_CH_CTRL_MODE_CONTINUOUS |
ADMA_CH_CTRL_FLOWCTRL_EN;
ch_regs->config |= cdata->adma_get_burst_config(burst_size);
ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1);
if (cdata->has_outstanding_reqs)
ch_regs->config |= TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(8);
/*
* 'sreq_index' represents the current ADMAIF channel number and as per
* HW recommendation its FIFO size should match with the corresponding
* ADMA channel.
*
* ADMA FIFO size is set as per below (based on default ADMAIF channel
* FIFO sizes):
* fifo_size = 0x2 (sreq_index > sreq_index_offset)
* fifo_size = 0x3 (sreq_index <= sreq_index_offset)
*
*/
if (tdc->sreq_index > cdata->sreq_index_offset)
ch_regs->fifo_ctrl =
ADMA_CH_REG_FIELD_VAL(2, cdata->ch_fifo_size_mask,
fifo_size_shift);
else
ch_regs->fifo_ctrl =
ADMA_CH_REG_FIELD_VAL(3, cdata->ch_fifo_size_mask,
fifo_size_shift);
ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK;
return tegra_adma_request_alloc(tdc, direction);
}
static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic(
struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
struct tegra_adma_desc *desc = NULL;
if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) {
dev_err(tdc2dev(tdc), "invalid buffer/period len\n");
return NULL;
}
if (buf_len % period_len) {
dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n");
return NULL;
}
if (!IS_ALIGNED(buf_addr, 4)) {
dev_err(tdc2dev(tdc), "invalid buffer alignment\n");
return NULL;
}
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
desc->buf_len = buf_len;
desc->period_len = period_len;
desc->num_periods = buf_len / period_len;
if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) {
kfree(desc);
return NULL;
}
return vchan_tx_prep(&tdc->vc, &desc->vd, flags);
}
static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
{
struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
int ret;
ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc);
if (ret) {
dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n",
dma_chan_name(dc));
return ret;
}
ret = pm_runtime_resume_and_get(tdc2dev(tdc));
if (ret < 0) {
free_irq(tdc->irq, tdc);
return ret;
}
dma_cookie_init(&tdc->vc.chan);
return 0;
}
static void tegra_adma_free_chan_resources(struct dma_chan *dc)
{
struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
tegra_adma_terminate_all(dc);
vchan_free_chan_resources(&tdc->vc);
tasklet_kill(&tdc->vc.task);
free_irq(tdc->irq, tdc);
pm_runtime_put(tdc2dev(tdc));
tdc->sreq_index = 0;
tdc->sreq_dir = DMA_TRANS_NONE;
}
static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct tegra_adma *tdma = ofdma->of_dma_data;
struct tegra_adma_chan *tdc;
struct dma_chan *chan;
unsigned int sreq_index;
if (dma_spec->args_count != 1)
return NULL;
sreq_index = dma_spec->args[0];
if (sreq_index == 0) {
dev_err(tdma->dev, "DMA request must not be 0\n");
return NULL;
}
chan = dma_get_any_slave_channel(&tdma->dma_dev);
if (!chan)
return NULL;
tdc = to_tegra_adma_chan(chan);
tdc->sreq_index = sreq_index;
return chan;
}
static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev)
{
struct tegra_adma *tdma = dev_get_drvdata(dev);
struct tegra_adma_chan_regs *ch_reg;
struct tegra_adma_chan *tdc;
int i;
tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
if (!tdma->global_cmd)
goto clk_disable;
for (i = 0; i < tdma->nr_channels; i++) {
tdc = &tdma->channels[i];
ch_reg = &tdc->ch_regs;
ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD);
/* skip if channel is not active */
if (!ch_reg->cmd)
continue;
ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC);
ch_reg->src_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_SRC_ADDR);
ch_reg->trg_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_TRG_ADDR);
ch_reg->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
ch_reg->fifo_ctrl = tdma_ch_read(tdc, ADMA_CH_FIFO_CTRL);
ch_reg->config = tdma_ch_read(tdc, ADMA_CH_CONFIG);
}
clk_disable:
clk_disable_unprepare(tdma->ahub_clk);
return 0;
}
static int __maybe_unused tegra_adma_runtime_resume(struct device *dev)
{
struct tegra_adma *tdma = dev_get_drvdata(dev);
struct tegra_adma_chan_regs *ch_reg;
struct tegra_adma_chan *tdc;
int ret, i;
ret = clk_prepare_enable(tdma->ahub_clk);
if (ret) {
dev_err(dev, "ahub clk_enable failed: %d\n", ret);
return ret;
}
tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
if (!tdma->global_cmd)
return 0;
for (i = 0; i < tdma->nr_channels; i++) {
tdc = &tdma->channels[i];
ch_reg = &tdc->ch_regs;
/* skip if channel was not active earlier */
if (!ch_reg->cmd)
continue;
tdma_ch_write(tdc, ADMA_CH_TC, ch_reg->tc);
tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_reg->src_addr);
tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_reg->trg_addr);
tdma_ch_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl);
tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_reg->fifo_ctrl);
tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_reg->config);
tdma_ch_write(tdc, ADMA_CH_CMD, ch_reg->cmd);
}
return 0;
}
static const struct tegra_adma_chip_data tegra210_chip_data = {
.adma_get_burst_config = tegra210_adma_get_burst_config,
.global_reg_offset = 0xc00,
.global_int_clear = 0x20,
.ch_req_tx_shift = 28,
.ch_req_rx_shift = 24,
.ch_base_offset = 0,
.ch_req_mask = 0xf,
.ch_req_max = 10,
.ch_reg_size = 0x80,
.nr_channels = 22,
.ch_fifo_size_mask = 0xf,
.sreq_index_offset = 2,
.has_outstanding_reqs = false,
};
static const struct tegra_adma_chip_data tegra186_chip_data = {
.adma_get_burst_config = tegra186_adma_get_burst_config,
.global_reg_offset = 0,
.global_int_clear = 0x402c,
.ch_req_tx_shift = 27,
.ch_req_rx_shift = 22,
.ch_base_offset = 0x10000,
.ch_req_mask = 0x1f,
.ch_req_max = 20,
.ch_reg_size = 0x100,
.nr_channels = 32,
.ch_fifo_size_mask = 0x1f,
.sreq_index_offset = 4,
.has_outstanding_reqs = true,
};
static const struct of_device_id tegra_adma_of_match[] = {
{ .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
{ .compatible = "nvidia,tegra186-adma", .data = &tegra186_chip_data },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
static int tegra_adma_probe(struct platform_device *pdev)
{
const struct tegra_adma_chip_data *cdata;
struct tegra_adma *tdma;
int ret, i;
cdata = of_device_get_match_data(&pdev->dev);
if (!cdata) {
dev_err(&pdev->dev, "device match data not found\n");
return -ENODEV;
}
tdma = devm_kzalloc(&pdev->dev,
struct_size(tdma, channels, cdata->nr_channels),
GFP_KERNEL);
if (!tdma)
return -ENOMEM;
tdma->dev = &pdev->dev;
tdma->cdata = cdata;
tdma->nr_channels = cdata->nr_channels;
platform_set_drvdata(pdev, tdma);
tdma->base_addr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(tdma->base_addr))
return PTR_ERR(tdma->base_addr);
tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio");
if (IS_ERR(tdma->ahub_clk)) {
dev_err(&pdev->dev, "Error: Missing ahub controller clock\n");
return PTR_ERR(tdma->ahub_clk);
}
INIT_LIST_HEAD(&tdma->dma_dev.channels);
for (i = 0; i < tdma->nr_channels; i++) {
struct tegra_adma_chan *tdc = &tdma->channels[i];
tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset
+ (cdata->ch_reg_size * i);
tdc->irq = of_irq_get(pdev->dev.of_node, i);
if (tdc->irq <= 0) {
ret = tdc->irq ?: -ENXIO;
goto irq_dispose;
}
vchan_init(&tdc->vc, &tdma->dma_dev);
tdc->vc.desc_free = tegra_adma_desc_free;
tdc->tdma = tdma;
}
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_resume_and_get(&pdev->dev);
if (ret < 0)
goto rpm_disable;
ret = tegra_adma_init(tdma);
if (ret)
goto rpm_put;
dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
tdma->dma_dev.dev = &pdev->dev;
tdma->dma_dev.device_alloc_chan_resources =
tegra_adma_alloc_chan_resources;
tdma->dma_dev.device_free_chan_resources =
tegra_adma_free_chan_resources;
tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
tdma->dma_dev.device_config = tegra_adma_slave_config;
tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
tdma->dma_dev.device_pause = tegra_adma_pause;
tdma->dma_dev.device_resume = tegra_adma_resume;
ret = dma_async_device_register(&tdma->dma_dev);
if (ret < 0) {
dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
goto rpm_put;
}
ret = of_dma_controller_register(pdev->dev.of_node,
tegra_dma_of_xlate, tdma);
if (ret < 0) {
dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
goto dma_remove;
}
pm_runtime_put(&pdev->dev);
dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
tdma->nr_channels);
return 0;
dma_remove:
dma_async_device_unregister(&tdma->dma_dev);
rpm_put:
pm_runtime_put_sync(&pdev->dev);
rpm_disable:
pm_runtime_disable(&pdev->dev);
irq_dispose:
while (--i >= 0)
irq_dispose_mapping(tdma->channels[i].irq);
return ret;
}
static int tegra_adma_remove(struct platform_device *pdev)
{
struct tegra_adma *tdma = platform_get_drvdata(pdev);
int i;
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&tdma->dma_dev);
for (i = 0; i < tdma->nr_channels; ++i)
irq_dispose_mapping(tdma->channels[i].irq);
pm_runtime_disable(&pdev->dev);
return 0;
}
static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
tegra_adma_runtime_resume, NULL)
SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static struct platform_driver tegra_admac_driver = {
.driver = {
.name = "tegra-adma",
.pm = &tegra_adma_dev_pm_ops,
.of_match_table = tegra_adma_of_match,
},
.probe = tegra_adma_probe,
.remove = tegra_adma_remove,
};
module_platform_driver(tegra_admac_driver);
MODULE_ALIAS("platform:tegra210-adma");
MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
MODULE_AUTHOR("Dara Ramesh <[email protected]>");
MODULE_AUTHOR("Jon Hunter <[email protected]>");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/tegra210-adma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* timb_dma.c timberdale FPGA DMA driver
* Copyright (c) 2010 Intel Corporation
*/
/* Supports:
* Timberdale FPGA DMA engine
*/
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/timb_dma.h>
#include "dmaengine.h"
#define DRIVER_NAME "timb-dma"
/* Global DMA registers */
#define TIMBDMA_ACR 0x34
#define TIMBDMA_32BIT_ADDR 0x01
#define TIMBDMA_ISR 0x080000
#define TIMBDMA_IPR 0x080004
#define TIMBDMA_IER 0x080008
/* Channel specific registers */
/* RX instances base addresses are 0x00, 0x40, 0x80 ...
* TX instances base addresses are 0x18, 0x58, 0x98 ...
*/
#define TIMBDMA_INSTANCE_OFFSET 0x40
#define TIMBDMA_INSTANCE_TX_OFFSET 0x18
/* RX registers, relative the instance base */
#define TIMBDMA_OFFS_RX_DHAR 0x00
#define TIMBDMA_OFFS_RX_DLAR 0x04
#define TIMBDMA_OFFS_RX_LR 0x0C
#define TIMBDMA_OFFS_RX_BLR 0x10
#define TIMBDMA_OFFS_RX_ER 0x14
#define TIMBDMA_RX_EN 0x01
/* bytes per Row, video specific register
* which is placed after the TX registers...
*/
#define TIMBDMA_OFFS_RX_BPRR 0x30
/* TX registers, relative the instance base */
#define TIMBDMA_OFFS_TX_DHAR 0x00
#define TIMBDMA_OFFS_TX_DLAR 0x04
#define TIMBDMA_OFFS_TX_BLR 0x0C
#define TIMBDMA_OFFS_TX_LR 0x14
#define TIMB_DMA_DESC_SIZE 8
struct timb_dma_desc {
struct list_head desc_node;
struct dma_async_tx_descriptor txd;
u8 *desc_list;
unsigned int desc_list_len;
bool interrupt;
};
struct timb_dma_chan {
struct dma_chan chan;
void __iomem *membase;
spinlock_t lock; /* Used to protect data structures,
especially the lists and descriptors,
from races between the tasklet and calls
from above */
bool ongoing;
struct list_head active_list;
struct list_head queue;
struct list_head free_list;
unsigned int bytes_per_line;
enum dma_transfer_direction direction;
unsigned int descs; /* Descriptors to allocate */
unsigned int desc_elems; /* number of elems per descriptor */
};
struct timb_dma {
struct dma_device dma;
void __iomem *membase;
struct tasklet_struct tasklet;
struct timb_dma_chan channels[];
};
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static struct device *chan2dmadev(struct dma_chan *chan)
{
return chan2dev(chan)->parent->parent;
}
static struct timb_dma *tdchantotd(struct timb_dma_chan *td_chan)
{
int id = td_chan->chan.chan_id;
return (struct timb_dma *)((u8 *)td_chan -
id * sizeof(struct timb_dma_chan) - sizeof(struct timb_dma));
}
/* Must be called with the spinlock held */
static void __td_enable_chan_irq(struct timb_dma_chan *td_chan)
{
int id = td_chan->chan.chan_id;
struct timb_dma *td = tdchantotd(td_chan);
u32 ier;
/* enable interrupt for this channel */
ier = ioread32(td->membase + TIMBDMA_IER);
ier |= 1 << id;
dev_dbg(chan2dev(&td_chan->chan), "Enabling irq: %d, IER: 0x%x\n", id,
ier);
iowrite32(ier, td->membase + TIMBDMA_IER);
}
/* Should be called with the spinlock held */
static bool __td_dma_done_ack(struct timb_dma_chan *td_chan)
{
int id = td_chan->chan.chan_id;
struct timb_dma *td = (struct timb_dma *)((u8 *)td_chan -
id * sizeof(struct timb_dma_chan) - sizeof(struct timb_dma));
u32 isr;
bool done = false;
dev_dbg(chan2dev(&td_chan->chan), "Checking irq: %d, td: %p\n", id, td);
isr = ioread32(td->membase + TIMBDMA_ISR) & (1 << id);
if (isr) {
iowrite32(isr, td->membase + TIMBDMA_ISR);
done = true;
}
return done;
}
static int td_fill_desc(struct timb_dma_chan *td_chan, u8 *dma_desc,
struct scatterlist *sg, bool last)
{
if (sg_dma_len(sg) > USHRT_MAX) {
dev_err(chan2dev(&td_chan->chan), "Too big sg element\n");
return -EINVAL;
}
/* length must be word aligned */
if (sg_dma_len(sg) % sizeof(u32)) {
dev_err(chan2dev(&td_chan->chan), "Incorrect length: %d\n",
sg_dma_len(sg));
return -EINVAL;
}
dev_dbg(chan2dev(&td_chan->chan), "desc: %p, addr: 0x%llx\n",
dma_desc, (unsigned long long)sg_dma_address(sg));
dma_desc[7] = (sg_dma_address(sg) >> 24) & 0xff;
dma_desc[6] = (sg_dma_address(sg) >> 16) & 0xff;
dma_desc[5] = (sg_dma_address(sg) >> 8) & 0xff;
dma_desc[4] = (sg_dma_address(sg) >> 0) & 0xff;
dma_desc[3] = (sg_dma_len(sg) >> 8) & 0xff;
dma_desc[2] = (sg_dma_len(sg) >> 0) & 0xff;
dma_desc[1] = 0x00;
dma_desc[0] = 0x21 | (last ? 0x02 : 0); /* tran, valid */
return 0;
}
/* Must be called with the spinlock held */
static void __td_start_dma(struct timb_dma_chan *td_chan)
{
struct timb_dma_desc *td_desc;
if (td_chan->ongoing) {
dev_err(chan2dev(&td_chan->chan),
"Transfer already ongoing\n");
return;
}
td_desc = list_entry(td_chan->active_list.next, struct timb_dma_desc,
desc_node);
dev_dbg(chan2dev(&td_chan->chan),
"td_chan: %p, chan: %d, membase: %p\n",
td_chan, td_chan->chan.chan_id, td_chan->membase);
if (td_chan->direction == DMA_DEV_TO_MEM) {
/* descriptor address */
iowrite32(0, td_chan->membase + TIMBDMA_OFFS_RX_DHAR);
iowrite32(td_desc->txd.phys, td_chan->membase +
TIMBDMA_OFFS_RX_DLAR);
/* Bytes per line */
iowrite32(td_chan->bytes_per_line, td_chan->membase +
TIMBDMA_OFFS_RX_BPRR);
/* enable RX */
iowrite32(TIMBDMA_RX_EN, td_chan->membase + TIMBDMA_OFFS_RX_ER);
} else {
/* address high */
iowrite32(0, td_chan->membase + TIMBDMA_OFFS_TX_DHAR);
iowrite32(td_desc->txd.phys, td_chan->membase +
TIMBDMA_OFFS_TX_DLAR);
}
td_chan->ongoing = true;
if (td_desc->interrupt)
__td_enable_chan_irq(td_chan);
}
static void __td_finish(struct timb_dma_chan *td_chan)
{
struct dmaengine_desc_callback cb;
struct dma_async_tx_descriptor *txd;
struct timb_dma_desc *td_desc;
/* can happen if the descriptor is canceled */
if (list_empty(&td_chan->active_list))
return;
td_desc = list_entry(td_chan->active_list.next, struct timb_dma_desc,
desc_node);
txd = &td_desc->txd;
dev_dbg(chan2dev(&td_chan->chan), "descriptor %u complete\n",
txd->cookie);
/* make sure to stop the transfer */
if (td_chan->direction == DMA_DEV_TO_MEM)
iowrite32(0, td_chan->membase + TIMBDMA_OFFS_RX_ER);
/* Currently no support for stopping DMA transfers
else
iowrite32(0, td_chan->membase + TIMBDMA_OFFS_TX_DLAR);
*/
dma_cookie_complete(txd);
td_chan->ongoing = false;
dmaengine_desc_get_callback(txd, &cb);
list_move(&td_desc->desc_node, &td_chan->free_list);
dma_descriptor_unmap(txd);
/*
* The API requires that no submissions are done from a
* callback, so we don't need to drop the lock here
*/
dmaengine_desc_callback_invoke(&cb, NULL);
}
static u32 __td_ier_mask(struct timb_dma *td)
{
int i;
u32 ret = 0;
for (i = 0; i < td->dma.chancnt; i++) {
struct timb_dma_chan *td_chan = td->channels + i;
if (td_chan->ongoing) {
struct timb_dma_desc *td_desc =
list_entry(td_chan->active_list.next,
struct timb_dma_desc, desc_node);
if (td_desc->interrupt)
ret |= 1 << i;
}
}
return ret;
}
static void __td_start_next(struct timb_dma_chan *td_chan)
{
struct timb_dma_desc *td_desc;
BUG_ON(list_empty(&td_chan->queue));
BUG_ON(td_chan->ongoing);
td_desc = list_entry(td_chan->queue.next, struct timb_dma_desc,
desc_node);
dev_dbg(chan2dev(&td_chan->chan), "%s: started %u\n",
__func__, td_desc->txd.cookie);
list_move(&td_desc->desc_node, &td_chan->active_list);
__td_start_dma(td_chan);
}
static dma_cookie_t td_tx_submit(struct dma_async_tx_descriptor *txd)
{
struct timb_dma_desc *td_desc = container_of(txd, struct timb_dma_desc,
txd);
struct timb_dma_chan *td_chan = container_of(txd->chan,
struct timb_dma_chan, chan);
dma_cookie_t cookie;
spin_lock_bh(&td_chan->lock);
cookie = dma_cookie_assign(txd);
if (list_empty(&td_chan->active_list)) {
dev_dbg(chan2dev(txd->chan), "%s: started %u\n", __func__,
txd->cookie);
list_add_tail(&td_desc->desc_node, &td_chan->active_list);
__td_start_dma(td_chan);
} else {
dev_dbg(chan2dev(txd->chan), "tx_submit: queued %u\n",
txd->cookie);
list_add_tail(&td_desc->desc_node, &td_chan->queue);
}
spin_unlock_bh(&td_chan->lock);
return cookie;
}
static struct timb_dma_desc *td_alloc_init_desc(struct timb_dma_chan *td_chan)
{
struct dma_chan *chan = &td_chan->chan;
struct timb_dma_desc *td_desc;
int err;
td_desc = kzalloc(sizeof(struct timb_dma_desc), GFP_KERNEL);
if (!td_desc)
goto out;
td_desc->desc_list_len = td_chan->desc_elems * TIMB_DMA_DESC_SIZE;
td_desc->desc_list = kzalloc(td_desc->desc_list_len, GFP_KERNEL);
if (!td_desc->desc_list)
goto err;
dma_async_tx_descriptor_init(&td_desc->txd, chan);
td_desc->txd.tx_submit = td_tx_submit;
td_desc->txd.flags = DMA_CTRL_ACK;
td_desc->txd.phys = dma_map_single(chan2dmadev(chan),
td_desc->desc_list, td_desc->desc_list_len, DMA_TO_DEVICE);
err = dma_mapping_error(chan2dmadev(chan), td_desc->txd.phys);
if (err) {
dev_err(chan2dev(chan), "DMA mapping error: %d\n", err);
goto err;
}
return td_desc;
err:
kfree(td_desc->desc_list);
kfree(td_desc);
out:
return NULL;
}
static void td_free_desc(struct timb_dma_desc *td_desc)
{
dev_dbg(chan2dev(td_desc->txd.chan), "Freeing desc: %p\n", td_desc);
dma_unmap_single(chan2dmadev(td_desc->txd.chan), td_desc->txd.phys,
td_desc->desc_list_len, DMA_TO_DEVICE);
kfree(td_desc->desc_list);
kfree(td_desc);
}
static void td_desc_put(struct timb_dma_chan *td_chan,
struct timb_dma_desc *td_desc)
{
dev_dbg(chan2dev(&td_chan->chan), "Putting desc: %p\n", td_desc);
spin_lock_bh(&td_chan->lock);
list_add(&td_desc->desc_node, &td_chan->free_list);
spin_unlock_bh(&td_chan->lock);
}
static struct timb_dma_desc *td_desc_get(struct timb_dma_chan *td_chan)
{
struct timb_dma_desc *td_desc, *_td_desc;
struct timb_dma_desc *ret = NULL;
spin_lock_bh(&td_chan->lock);
list_for_each_entry_safe(td_desc, _td_desc, &td_chan->free_list,
desc_node) {
if (async_tx_test_ack(&td_desc->txd)) {
list_del(&td_desc->desc_node);
ret = td_desc;
break;
}
dev_dbg(chan2dev(&td_chan->chan), "desc %p not ACKed\n",
td_desc);
}
spin_unlock_bh(&td_chan->lock);
return ret;
}
static int td_alloc_chan_resources(struct dma_chan *chan)
{
struct timb_dma_chan *td_chan =
container_of(chan, struct timb_dma_chan, chan);
int i;
dev_dbg(chan2dev(chan), "%s: entry\n", __func__);
BUG_ON(!list_empty(&td_chan->free_list));
for (i = 0; i < td_chan->descs; i++) {
struct timb_dma_desc *td_desc = td_alloc_init_desc(td_chan);
if (!td_desc) {
if (i)
break;
else {
dev_err(chan2dev(chan),
"Couldn't allocate any descriptors\n");
return -ENOMEM;
}
}
td_desc_put(td_chan, td_desc);
}
spin_lock_bh(&td_chan->lock);
dma_cookie_init(chan);
spin_unlock_bh(&td_chan->lock);
return 0;
}
static void td_free_chan_resources(struct dma_chan *chan)
{
struct timb_dma_chan *td_chan =
container_of(chan, struct timb_dma_chan, chan);
struct timb_dma_desc *td_desc, *_td_desc;
LIST_HEAD(list);
dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
/* check that all descriptors are free */
BUG_ON(!list_empty(&td_chan->active_list));
BUG_ON(!list_empty(&td_chan->queue));
spin_lock_bh(&td_chan->lock);
list_splice_init(&td_chan->free_list, &list);
spin_unlock_bh(&td_chan->lock);
list_for_each_entry_safe(td_desc, _td_desc, &list, desc_node) {
dev_dbg(chan2dev(chan), "%s: Freeing desc: %p\n", __func__,
td_desc);
td_free_desc(td_desc);
}
}
static enum dma_status td_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
enum dma_status ret;
dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
ret = dma_cookie_status(chan, cookie, txstate);
dev_dbg(chan2dev(chan), "%s: exit, ret: %d\n", __func__, ret);
return ret;
}
static void td_issue_pending(struct dma_chan *chan)
{
struct timb_dma_chan *td_chan =
container_of(chan, struct timb_dma_chan, chan);
dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
spin_lock_bh(&td_chan->lock);
if (!list_empty(&td_chan->active_list))
/* transfer ongoing */
if (__td_dma_done_ack(td_chan))
__td_finish(td_chan);
if (list_empty(&td_chan->active_list) && !list_empty(&td_chan->queue))
__td_start_next(td_chan);
spin_unlock_bh(&td_chan->lock);
}
static struct dma_async_tx_descriptor *td_prep_slave_sg(struct dma_chan *chan,
struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long flags,
void *context)
{
struct timb_dma_chan *td_chan =
container_of(chan, struct timb_dma_chan, chan);
struct timb_dma_desc *td_desc;
struct scatterlist *sg;
unsigned int i;
unsigned int desc_usage = 0;
if (!sgl || !sg_len) {
dev_err(chan2dev(chan), "%s: No SG list\n", __func__);
return NULL;
}
/* even channels are for RX, odd for TX */
if (td_chan->direction != direction) {
dev_err(chan2dev(chan),
"Requesting channel in wrong direction\n");
return NULL;
}
td_desc = td_desc_get(td_chan);
if (!td_desc) {
dev_err(chan2dev(chan), "Not enough descriptors available\n");
return NULL;
}
td_desc->interrupt = (flags & DMA_PREP_INTERRUPT) != 0;
for_each_sg(sgl, sg, sg_len, i) {
int err;
if (desc_usage > td_desc->desc_list_len) {
dev_err(chan2dev(chan), "No descriptor space\n");
return NULL;
}
err = td_fill_desc(td_chan, td_desc->desc_list + desc_usage, sg,
i == (sg_len - 1));
if (err) {
dev_err(chan2dev(chan), "Failed to update desc: %d\n",
err);
td_desc_put(td_chan, td_desc);
return NULL;
}
desc_usage += TIMB_DMA_DESC_SIZE;
}
dma_sync_single_for_device(chan2dmadev(chan), td_desc->txd.phys,
td_desc->desc_list_len, DMA_TO_DEVICE);
return &td_desc->txd;
}
static int td_terminate_all(struct dma_chan *chan)
{
struct timb_dma_chan *td_chan =
container_of(chan, struct timb_dma_chan, chan);
struct timb_dma_desc *td_desc, *_td_desc;
dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
/* first the easy part, put the queue into the free list */
spin_lock_bh(&td_chan->lock);
list_for_each_entry_safe(td_desc, _td_desc, &td_chan->queue,
desc_node)
list_move(&td_desc->desc_node, &td_chan->free_list);
/* now tear down the running */
__td_finish(td_chan);
spin_unlock_bh(&td_chan->lock);
return 0;
}
static void td_tasklet(struct tasklet_struct *t)
{
struct timb_dma *td = from_tasklet(td, t, tasklet);
u32 isr;
u32 ipr;
u32 ier;
int i;
isr = ioread32(td->membase + TIMBDMA_ISR);
ipr = isr & __td_ier_mask(td);
/* ack the interrupts */
iowrite32(ipr, td->membase + TIMBDMA_ISR);
for (i = 0; i < td->dma.chancnt; i++)
if (ipr & (1 << i)) {
struct timb_dma_chan *td_chan = td->channels + i;
spin_lock(&td_chan->lock);
__td_finish(td_chan);
if (!list_empty(&td_chan->queue))
__td_start_next(td_chan);
spin_unlock(&td_chan->lock);
}
ier = __td_ier_mask(td);
iowrite32(ier, td->membase + TIMBDMA_IER);
}
static irqreturn_t td_irq(int irq, void *devid)
{
struct timb_dma *td = devid;
u32 ipr = ioread32(td->membase + TIMBDMA_IPR);
if (ipr) {
/* disable interrupts, will be re-enabled in tasklet */
iowrite32(0, td->membase + TIMBDMA_IER);
tasklet_schedule(&td->tasklet);
return IRQ_HANDLED;
} else
return IRQ_NONE;
}
static int td_probe(struct platform_device *pdev)
{
struct timb_dma_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct timb_dma *td;
struct resource *iomem;
int irq;
int err;
int i;
if (!pdata) {
dev_err(&pdev->dev, "No platform data\n");
return -EINVAL;
}
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iomem)
return -EINVAL;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
if (!request_mem_region(iomem->start, resource_size(iomem),
DRIVER_NAME))
return -EBUSY;
td = kzalloc(struct_size(td, channels, pdata->nr_channels),
GFP_KERNEL);
if (!td) {
err = -ENOMEM;
goto err_release_region;
}
dev_dbg(&pdev->dev, "Allocated TD: %p\n", td);
td->membase = ioremap(iomem->start, resource_size(iomem));
if (!td->membase) {
dev_err(&pdev->dev, "Failed to remap I/O memory\n");
err = -ENOMEM;
goto err_free_mem;
}
/* 32bit addressing */
iowrite32(TIMBDMA_32BIT_ADDR, td->membase + TIMBDMA_ACR);
/* disable and clear any interrupts */
iowrite32(0x0, td->membase + TIMBDMA_IER);
iowrite32(0xFFFFFFFF, td->membase + TIMBDMA_ISR);
tasklet_setup(&td->tasklet, td_tasklet);
err = request_irq(irq, td_irq, IRQF_SHARED, DRIVER_NAME, td);
if (err) {
dev_err(&pdev->dev, "Failed to request IRQ\n");
goto err_tasklet_kill;
}
td->dma.device_alloc_chan_resources = td_alloc_chan_resources;
td->dma.device_free_chan_resources = td_free_chan_resources;
td->dma.device_tx_status = td_tx_status;
td->dma.device_issue_pending = td_issue_pending;
dma_cap_set(DMA_SLAVE, td->dma.cap_mask);
dma_cap_set(DMA_PRIVATE, td->dma.cap_mask);
td->dma.device_prep_slave_sg = td_prep_slave_sg;
td->dma.device_terminate_all = td_terminate_all;
td->dma.dev = &pdev->dev;
INIT_LIST_HEAD(&td->dma.channels);
for (i = 0; i < pdata->nr_channels; i++) {
struct timb_dma_chan *td_chan = &td->channels[i];
struct timb_dma_platform_data_channel *pchan =
pdata->channels + i;
/* even channels are RX, odd are TX */
if ((i % 2) == pchan->rx) {
dev_err(&pdev->dev, "Wrong channel configuration\n");
err = -EINVAL;
goto err_free_irq;
}
td_chan->chan.device = &td->dma;
dma_cookie_init(&td_chan->chan);
spin_lock_init(&td_chan->lock);
INIT_LIST_HEAD(&td_chan->active_list);
INIT_LIST_HEAD(&td_chan->queue);
INIT_LIST_HEAD(&td_chan->free_list);
td_chan->descs = pchan->descriptors;
td_chan->desc_elems = pchan->descriptor_elements;
td_chan->bytes_per_line = pchan->bytes_per_line;
td_chan->direction = pchan->rx ? DMA_DEV_TO_MEM :
DMA_MEM_TO_DEV;
td_chan->membase = td->membase +
(i / 2) * TIMBDMA_INSTANCE_OFFSET +
(pchan->rx ? 0 : TIMBDMA_INSTANCE_TX_OFFSET);
dev_dbg(&pdev->dev, "Chan: %d, membase: %p\n",
i, td_chan->membase);
list_add_tail(&td_chan->chan.device_node, &td->dma.channels);
}
err = dma_async_device_register(&td->dma);
if (err) {
dev_err(&pdev->dev, "Failed to register async device\n");
goto err_free_irq;
}
platform_set_drvdata(pdev, td);
dev_dbg(&pdev->dev, "Probe result: %d\n", err);
return err;
err_free_irq:
free_irq(irq, td);
err_tasklet_kill:
tasklet_kill(&td->tasklet);
iounmap(td->membase);
err_free_mem:
kfree(td);
err_release_region:
release_mem_region(iomem->start, resource_size(iomem));
return err;
}
static int td_remove(struct platform_device *pdev)
{
struct timb_dma *td = platform_get_drvdata(pdev);
struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int irq = platform_get_irq(pdev, 0);
dma_async_device_unregister(&td->dma);
free_irq(irq, td);
tasklet_kill(&td->tasklet);
iounmap(td->membase);
kfree(td);
release_mem_region(iomem->start, resource_size(iomem));
dev_dbg(&pdev->dev, "Removed...\n");
return 0;
}
static struct platform_driver td_driver = {
.driver = {
.name = DRIVER_NAME,
},
.probe = td_probe,
.remove = td_remove,
};
module_platform_driver(td_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Timberdale DMA controller driver");
MODULE_AUTHOR("Pelagicore AB <[email protected]>");
MODULE_ALIAS("platform:"DRIVER_NAME);
| linux-master | drivers/dma/timb_dma.c |
// SPDX-License-Identifier: GPL-2.0+
//
// Copyright (c) 2013-2014 Freescale Semiconductor, Inc
// Copyright (c) 2017 Sysam, Angelo Dureghello <[email protected]>
#include <linux/dmapool.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/pm_runtime.h>
#include <linux/pm_domain.h>
#include "fsl-edma-common.h"
#define EDMA_CR 0x00
#define EDMA_ES 0x04
#define EDMA_ERQ 0x0C
#define EDMA_EEI 0x14
#define EDMA_SERQ 0x1B
#define EDMA_CERQ 0x1A
#define EDMA_SEEI 0x19
#define EDMA_CEEI 0x18
#define EDMA_CINT 0x1F
#define EDMA_CERR 0x1E
#define EDMA_SSRT 0x1D
#define EDMA_CDNE 0x1C
#define EDMA_INTR 0x24
#define EDMA_ERR 0x2C
#define EDMA64_ERQH 0x08
#define EDMA64_EEIH 0x10
#define EDMA64_SERQ 0x18
#define EDMA64_CERQ 0x19
#define EDMA64_SEEI 0x1a
#define EDMA64_CEEI 0x1b
#define EDMA64_CINT 0x1c
#define EDMA64_CERR 0x1d
#define EDMA64_SSRT 0x1e
#define EDMA64_CDNE 0x1f
#define EDMA64_INTH 0x20
#define EDMA64_INTL 0x24
#define EDMA64_ERRH 0x28
#define EDMA64_ERRL 0x2c
void fsl_edma_tx_chan_handler(struct fsl_edma_chan *fsl_chan)
{
spin_lock(&fsl_chan->vchan.lock);
if (!fsl_chan->edesc) {
/* terminate_all called before */
spin_unlock(&fsl_chan->vchan.lock);
return;
}
if (!fsl_chan->edesc->iscyclic) {
list_del(&fsl_chan->edesc->vdesc.node);
vchan_cookie_complete(&fsl_chan->edesc->vdesc);
fsl_chan->edesc = NULL;
fsl_chan->status = DMA_COMPLETE;
fsl_chan->idle = true;
} else {
vchan_cyclic_callback(&fsl_chan->edesc->vdesc);
}
if (!fsl_chan->edesc)
fsl_edma_xfer_desc(fsl_chan);
spin_unlock(&fsl_chan->vchan.lock);
}
static void fsl_edma3_enable_request(struct fsl_edma_chan *fsl_chan)
{
u32 val, flags;
flags = fsl_edma_drvflags(fsl_chan);
val = edma_readl_chreg(fsl_chan, ch_sbr);
/* Remote/local swapped wrongly on iMX8 QM Audio edma */
if (flags & FSL_EDMA_DRV_QUIRK_SWAPPED) {
if (!fsl_chan->is_rxchan)
val |= EDMA_V3_CH_SBR_RD;
else
val |= EDMA_V3_CH_SBR_WR;
} else {
if (fsl_chan->is_rxchan)
val |= EDMA_V3_CH_SBR_RD;
else
val |= EDMA_V3_CH_SBR_WR;
}
if (fsl_chan->is_remote)
val &= ~(EDMA_V3_CH_SBR_RD | EDMA_V3_CH_SBR_WR);
edma_writel_chreg(fsl_chan, val, ch_sbr);
if (flags & FSL_EDMA_DRV_HAS_CHMUX)
edma_writel_chreg(fsl_chan, fsl_chan->srcid, ch_mux);
val = edma_readl_chreg(fsl_chan, ch_csr);
val |= EDMA_V3_CH_CSR_ERQ;
edma_writel_chreg(fsl_chan, val, ch_csr);
}
static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
{
struct edma_regs *regs = &fsl_chan->edma->regs;
u32 ch = fsl_chan->vchan.chan.chan_id;
if (fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_SPLIT_REG)
return fsl_edma3_enable_request(fsl_chan);
if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_WRAP_IO) {
edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), regs->seei);
edma_writeb(fsl_chan->edma, ch, regs->serq);
} else {
/* ColdFire is big endian, and accesses natively
* big endian I/O peripherals
*/
iowrite8(EDMA_SEEI_SEEI(ch), regs->seei);
iowrite8(ch, regs->serq);
}
}
static void fsl_edma3_disable_request(struct fsl_edma_chan *fsl_chan)
{
u32 val = edma_readl_chreg(fsl_chan, ch_csr);
u32 flags;
flags = fsl_edma_drvflags(fsl_chan);
if (flags & FSL_EDMA_DRV_HAS_CHMUX)
edma_writel_chreg(fsl_chan, 0, ch_mux);
val &= ~EDMA_V3_CH_CSR_ERQ;
edma_writel_chreg(fsl_chan, val, ch_csr);
}
void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
{
struct edma_regs *regs = &fsl_chan->edma->regs;
u32 ch = fsl_chan->vchan.chan.chan_id;
if (fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_SPLIT_REG)
return fsl_edma3_disable_request(fsl_chan);
if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_WRAP_IO) {
edma_writeb(fsl_chan->edma, ch, regs->cerq);
edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), regs->ceei);
} else {
/* ColdFire is big endian, and accesses natively
* big endian I/O peripherals
*/
iowrite8(ch, regs->cerq);
iowrite8(EDMA_CEEI_CEEI(ch), regs->ceei);
}
}
static void mux_configure8(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
u32 off, u32 slot, bool enable)
{
u8 val8;
if (enable)
val8 = EDMAMUX_CHCFG_ENBL | slot;
else
val8 = EDMAMUX_CHCFG_DIS;
iowrite8(val8, addr + off);
}
static void mux_configure32(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
u32 off, u32 slot, bool enable)
{
u32 val;
if (enable)
val = EDMAMUX_CHCFG_ENBL << 24 | slot;
else
val = EDMAMUX_CHCFG_DIS;
iowrite32(val, addr + off * 4);
}
void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
unsigned int slot, bool enable)
{
u32 ch = fsl_chan->vchan.chan.chan_id;
void __iomem *muxaddr;
unsigned int chans_per_mux, ch_off;
int endian_diff[4] = {3, 1, -1, -3};
u32 dmamux_nr = fsl_chan->edma->drvdata->dmamuxs;
if (!dmamux_nr)
return;
chans_per_mux = fsl_chan->edma->n_chans / dmamux_nr;
ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_MUX_SWAP)
ch_off += endian_diff[ch_off % 4];
muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
slot = EDMAMUX_CHCFG_SOURCE(slot);
if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_CONFIG32)
mux_configure32(fsl_chan, muxaddr, ch_off, slot, enable);
else
mux_configure8(fsl_chan, muxaddr, ch_off, slot, enable);
}
static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
{
u32 val;
if (addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
val = ffs(addr_width) - 1;
return val | (val << 8);
}
void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
{
struct fsl_edma_desc *fsl_desc;
int i;
fsl_desc = to_fsl_edma_desc(vdesc);
for (i = 0; i < fsl_desc->n_tcds; i++)
dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd,
fsl_desc->tcd[i].ptcd);
kfree(fsl_desc);
}
int fsl_edma_terminate_all(struct dma_chan *chan)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
fsl_edma_disable_request(fsl_chan);
fsl_chan->edesc = NULL;
fsl_chan->idle = true;
vchan_get_all_descriptors(&fsl_chan->vchan, &head);
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
if (fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_HAS_PD)
pm_runtime_allow(fsl_chan->pd_dev);
return 0;
}
int fsl_edma_pause(struct dma_chan *chan)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
if (fsl_chan->edesc) {
fsl_edma_disable_request(fsl_chan);
fsl_chan->status = DMA_PAUSED;
fsl_chan->idle = true;
}
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
return 0;
}
int fsl_edma_resume(struct dma_chan *chan)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
if (fsl_chan->edesc) {
fsl_edma_enable_request(fsl_chan);
fsl_chan->status = DMA_IN_PROGRESS;
fsl_chan->idle = false;
}
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
return 0;
}
static void fsl_edma_unprep_slave_dma(struct fsl_edma_chan *fsl_chan)
{
if (fsl_chan->dma_dir != DMA_NONE)
dma_unmap_resource(fsl_chan->vchan.chan.device->dev,
fsl_chan->dma_dev_addr,
fsl_chan->dma_dev_size,
fsl_chan->dma_dir, 0);
fsl_chan->dma_dir = DMA_NONE;
}
static bool fsl_edma_prep_slave_dma(struct fsl_edma_chan *fsl_chan,
enum dma_transfer_direction dir)
{
struct device *dev = fsl_chan->vchan.chan.device->dev;
enum dma_data_direction dma_dir;
phys_addr_t addr = 0;
u32 size = 0;
switch (dir) {
case DMA_MEM_TO_DEV:
dma_dir = DMA_FROM_DEVICE;
addr = fsl_chan->cfg.dst_addr;
size = fsl_chan->cfg.dst_maxburst;
break;
case DMA_DEV_TO_MEM:
dma_dir = DMA_TO_DEVICE;
addr = fsl_chan->cfg.src_addr;
size = fsl_chan->cfg.src_maxburst;
break;
default:
dma_dir = DMA_NONE;
break;
}
/* Already mapped for this config? */
if (fsl_chan->dma_dir == dma_dir)
return true;
fsl_edma_unprep_slave_dma(fsl_chan);
fsl_chan->dma_dev_addr = dma_map_resource(dev, addr, size, dma_dir, 0);
if (dma_mapping_error(dev, fsl_chan->dma_dev_addr))
return false;
fsl_chan->dma_dev_size = size;
fsl_chan->dma_dir = dma_dir;
return true;
}
int fsl_edma_slave_config(struct dma_chan *chan,
struct dma_slave_config *cfg)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
memcpy(&fsl_chan->cfg, cfg, sizeof(*cfg));
fsl_edma_unprep_slave_dma(fsl_chan);
return 0;
}
static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
struct virt_dma_desc *vdesc, bool in_progress)
{
struct fsl_edma_desc *edesc = fsl_chan->edesc;
enum dma_transfer_direction dir = edesc->dirn;
dma_addr_t cur_addr, dma_addr;
size_t len, size;
u32 nbytes = 0;
int i;
/* calculate the total size in this desc */
for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++) {
nbytes = le32_to_cpu(edesc->tcd[i].vtcd->nbytes);
if (nbytes & (EDMA_V3_TCD_NBYTES_DMLOE | EDMA_V3_TCD_NBYTES_SMLOE))
nbytes = EDMA_V3_TCD_NBYTES_MLOFF_NBYTES(nbytes);
len += nbytes * le16_to_cpu(edesc->tcd[i].vtcd->biter);
}
if (!in_progress)
return len;
if (dir == DMA_MEM_TO_DEV)
cur_addr = edma_read_tcdreg(fsl_chan, saddr);
else
cur_addr = edma_read_tcdreg(fsl_chan, daddr);
/* figure out the finished and calculate the residue */
for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
nbytes = le32_to_cpu(edesc->tcd[i].vtcd->nbytes);
if (nbytes & (EDMA_V3_TCD_NBYTES_DMLOE | EDMA_V3_TCD_NBYTES_SMLOE))
nbytes = EDMA_V3_TCD_NBYTES_MLOFF_NBYTES(nbytes);
size = nbytes * le16_to_cpu(edesc->tcd[i].vtcd->biter);
if (dir == DMA_MEM_TO_DEV)
dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr);
else
dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr);
len -= size;
if (cur_addr >= dma_addr && cur_addr < dma_addr + size) {
len += dma_addr + size - cur_addr;
break;
}
}
return len;
}
enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
struct virt_dma_desc *vdesc;
enum dma_status status;
unsigned long flags;
status = dma_cookie_status(chan, cookie, txstate);
if (status == DMA_COMPLETE)
return status;
if (!txstate)
return fsl_chan->status;
spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
txstate->residue =
fsl_edma_desc_residue(fsl_chan, vdesc, true);
else if (vdesc)
txstate->residue =
fsl_edma_desc_residue(fsl_chan, vdesc, false);
else
txstate->residue = 0;
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
return fsl_chan->status;
}
static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
struct fsl_edma_hw_tcd *tcd)
{
u16 csr = 0;
/*
* TCD parameters are stored in struct fsl_edma_hw_tcd in little
* endian format. However, we need to load the TCD registers in
* big- or little-endian obeying the eDMA engine model endian,
* and this is performed from specific edma_write functions
*/
edma_write_tcdreg(fsl_chan, 0, csr);
edma_write_tcdreg(fsl_chan, tcd->saddr, saddr);
edma_write_tcdreg(fsl_chan, tcd->daddr, daddr);
edma_write_tcdreg(fsl_chan, tcd->attr, attr);
edma_write_tcdreg(fsl_chan, tcd->soff, soff);
edma_write_tcdreg(fsl_chan, tcd->nbytes, nbytes);
edma_write_tcdreg(fsl_chan, tcd->slast, slast);
edma_write_tcdreg(fsl_chan, tcd->citer, citer);
edma_write_tcdreg(fsl_chan, tcd->biter, biter);
edma_write_tcdreg(fsl_chan, tcd->doff, doff);
edma_write_tcdreg(fsl_chan, tcd->dlast_sga, dlast_sga);
if (fsl_chan->is_sw) {
csr = le16_to_cpu(tcd->csr);
csr |= EDMA_TCD_CSR_START;
tcd->csr = cpu_to_le16(csr);
}
edma_write_tcdreg(fsl_chan, tcd->csr, csr);
}
static inline
void fsl_edma_fill_tcd(struct fsl_edma_chan *fsl_chan,
struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
u16 biter, u16 doff, u32 dlast_sga, bool major_int,
bool disable_req, bool enable_sg)
{
struct dma_slave_config *cfg = &fsl_chan->cfg;
u16 csr = 0;
u32 burst;
/*
* eDMA hardware SGs require the TCDs to be stored in little
* endian format irrespective of the register endian model.
* So we put the value in little endian in memory, waiting
* for fsl_edma_set_tcd_regs doing the swap.
*/
tcd->saddr = cpu_to_le32(src);
tcd->daddr = cpu_to_le32(dst);
tcd->attr = cpu_to_le16(attr);
tcd->soff = cpu_to_le16(soff);
if (fsl_chan->is_multi_fifo) {
/* set mloff to support multiple fifo */
burst = cfg->direction == DMA_DEV_TO_MEM ?
cfg->src_addr_width : cfg->dst_addr_width;
nbytes |= EDMA_V3_TCD_NBYTES_MLOFF(-(burst * 4));
/* enable DMLOE/SMLOE */
if (cfg->direction == DMA_MEM_TO_DEV) {
nbytes |= EDMA_V3_TCD_NBYTES_DMLOE;
nbytes &= ~EDMA_V3_TCD_NBYTES_SMLOE;
} else {
nbytes |= EDMA_V3_TCD_NBYTES_SMLOE;
nbytes &= ~EDMA_V3_TCD_NBYTES_DMLOE;
}
}
tcd->nbytes = cpu_to_le32(nbytes);
tcd->slast = cpu_to_le32(slast);
tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));
tcd->doff = cpu_to_le16(doff);
tcd->dlast_sga = cpu_to_le32(dlast_sga);
tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));
if (major_int)
csr |= EDMA_TCD_CSR_INT_MAJOR;
if (disable_req)
csr |= EDMA_TCD_CSR_D_REQ;
if (enable_sg)
csr |= EDMA_TCD_CSR_E_SG;
if (fsl_chan->is_rxchan)
csr |= EDMA_TCD_CSR_ACTIVE;
if (fsl_chan->is_sw)
csr |= EDMA_TCD_CSR_START;
tcd->csr = cpu_to_le16(csr);
}
static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
int sg_len)
{
struct fsl_edma_desc *fsl_desc;
int i;
fsl_desc = kzalloc(struct_size(fsl_desc, tcd, sg_len), GFP_NOWAIT);
if (!fsl_desc)
return NULL;
fsl_desc->echan = fsl_chan;
fsl_desc->n_tcds = sg_len;
for (i = 0; i < sg_len; i++) {
fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
if (!fsl_desc->tcd[i].vtcd)
goto err;
}
return fsl_desc;
err:
while (--i >= 0)
dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
fsl_desc->tcd[i].ptcd);
kfree(fsl_desc);
return NULL;
}
struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
struct fsl_edma_desc *fsl_desc;
dma_addr_t dma_buf_next;
bool major_int = true;
int sg_len, i;
u32 src_addr, dst_addr, last_sg, nbytes;
u16 soff, doff, iter;
if (!is_slave_direction(direction))
return NULL;
if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
return NULL;
sg_len = buf_len / period_len;
fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
if (!fsl_desc)
return NULL;
fsl_desc->iscyclic = true;
fsl_desc->dirn = direction;
dma_buf_next = dma_addr;
if (direction == DMA_MEM_TO_DEV) {
fsl_chan->attr =
fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
nbytes = fsl_chan->cfg.dst_addr_width *
fsl_chan->cfg.dst_maxburst;
} else {
fsl_chan->attr =
fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
nbytes = fsl_chan->cfg.src_addr_width *
fsl_chan->cfg.src_maxburst;
}
iter = period_len / nbytes;
for (i = 0; i < sg_len; i++) {
if (dma_buf_next >= dma_addr + buf_len)
dma_buf_next = dma_addr;
/* get next sg's physical address */
last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
if (direction == DMA_MEM_TO_DEV) {
src_addr = dma_buf_next;
dst_addr = fsl_chan->dma_dev_addr;
soff = fsl_chan->cfg.dst_addr_width;
doff = fsl_chan->is_multi_fifo ? 4 : 0;
} else if (direction == DMA_DEV_TO_MEM) {
src_addr = fsl_chan->dma_dev_addr;
dst_addr = dma_buf_next;
soff = fsl_chan->is_multi_fifo ? 4 : 0;
doff = fsl_chan->cfg.src_addr_width;
} else {
/* DMA_DEV_TO_DEV */
src_addr = fsl_chan->cfg.src_addr;
dst_addr = fsl_chan->cfg.dst_addr;
soff = doff = 0;
major_int = false;
}
fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[i].vtcd, src_addr, dst_addr,
fsl_chan->attr, soff, nbytes, 0, iter,
iter, doff, last_sg, major_int, false, true);
dma_buf_next += period_len;
}
return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
}
struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
struct fsl_edma_desc *fsl_desc;
struct scatterlist *sg;
u32 src_addr, dst_addr, last_sg, nbytes;
u16 soff, doff, iter;
int i;
if (!is_slave_direction(direction))
return NULL;
if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
return NULL;
fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
if (!fsl_desc)
return NULL;
fsl_desc->iscyclic = false;
fsl_desc->dirn = direction;
if (direction == DMA_MEM_TO_DEV) {
fsl_chan->attr =
fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
nbytes = fsl_chan->cfg.dst_addr_width *
fsl_chan->cfg.dst_maxburst;
} else {
fsl_chan->attr =
fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
nbytes = fsl_chan->cfg.src_addr_width *
fsl_chan->cfg.src_maxburst;
}
for_each_sg(sgl, sg, sg_len, i) {
if (direction == DMA_MEM_TO_DEV) {
src_addr = sg_dma_address(sg);
dst_addr = fsl_chan->dma_dev_addr;
soff = fsl_chan->cfg.dst_addr_width;
doff = 0;
} else if (direction == DMA_DEV_TO_MEM) {
src_addr = fsl_chan->dma_dev_addr;
dst_addr = sg_dma_address(sg);
soff = 0;
doff = fsl_chan->cfg.src_addr_width;
} else {
/* DMA_DEV_TO_DEV */
src_addr = fsl_chan->cfg.src_addr;
dst_addr = fsl_chan->cfg.dst_addr;
soff = 0;
doff = 0;
}
/*
* Choose the suitable burst length if sg_dma_len is not
* multiple of burst length so that the whole transfer length is
* multiple of minor loop(burst length).
*/
if (sg_dma_len(sg) % nbytes) {
u32 width = (direction == DMA_DEV_TO_MEM) ? doff : soff;
u32 burst = (direction == DMA_DEV_TO_MEM) ?
fsl_chan->cfg.src_maxburst :
fsl_chan->cfg.dst_maxburst;
int j;
for (j = burst; j > 1; j--) {
if (!(sg_dma_len(sg) % (j * width))) {
nbytes = j * width;
break;
}
}
/* Set burst size as 1 if there's no suitable one */
if (j == 1)
nbytes = width;
}
iter = sg_dma_len(sg) / nbytes;
if (i < sg_len - 1) {
last_sg = fsl_desc->tcd[(i + 1)].ptcd;
fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[i].vtcd, src_addr,
dst_addr, fsl_chan->attr, soff,
nbytes, 0, iter, iter, doff, last_sg,
false, false, true);
} else {
last_sg = 0;
fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[i].vtcd, src_addr,
dst_addr, fsl_chan->attr, soff,
nbytes, 0, iter, iter, doff, last_sg,
true, true, false);
}
}
return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
}
struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(struct dma_chan *chan,
dma_addr_t dma_dst, dma_addr_t dma_src,
size_t len, unsigned long flags)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
struct fsl_edma_desc *fsl_desc;
fsl_desc = fsl_edma_alloc_desc(fsl_chan, 1);
if (!fsl_desc)
return NULL;
fsl_desc->iscyclic = false;
fsl_chan->is_sw = true;
/* To match with copy_align and max_seg_size so 1 tcd is enough */
fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[0].vtcd, dma_src, dma_dst,
fsl_edma_get_tcd_attr(DMA_SLAVE_BUSWIDTH_32_BYTES),
32, len, 0, 1, 1, 32, 0, true, true, false);
return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
}
void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
{
struct virt_dma_desc *vdesc;
lockdep_assert_held(&fsl_chan->vchan.lock);
vdesc = vchan_next_desc(&fsl_chan->vchan);
if (!vdesc)
return;
fsl_chan->edesc = to_fsl_edma_desc(vdesc);
fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);
fsl_edma_enable_request(fsl_chan);
fsl_chan->status = DMA_IN_PROGRESS;
fsl_chan->idle = false;
}
void fsl_edma_issue_pending(struct dma_chan *chan)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
if (unlikely(fsl_chan->pm_state != RUNNING)) {
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
/* cannot submit due to suspend */
return;
}
if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
fsl_edma_xfer_desc(fsl_chan);
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
}
int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
sizeof(struct fsl_edma_hw_tcd),
32, 0);
return 0;
}
void fsl_edma_free_chan_resources(struct dma_chan *chan)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
struct fsl_edma_engine *edma = fsl_chan->edma;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
fsl_edma_disable_request(fsl_chan);
if (edma->drvdata->dmamuxs)
fsl_edma_chan_mux(fsl_chan, 0, false);
fsl_chan->edesc = NULL;
vchan_get_all_descriptors(&fsl_chan->vchan, &head);
fsl_edma_unprep_slave_dma(fsl_chan);
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
dma_pool_destroy(fsl_chan->tcd_pool);
fsl_chan->tcd_pool = NULL;
fsl_chan->is_sw = false;
}
void fsl_edma_cleanup_vchan(struct dma_device *dmadev)
{
struct fsl_edma_chan *chan, *_chan;
list_for_each_entry_safe(chan, _chan,
&dmadev->channels, vchan.chan.device_node) {
list_del(&chan->vchan.chan.device_node);
tasklet_kill(&chan->vchan.task);
}
}
/*
* On the 32 channels Vybrid/mpc577x edma version, register offsets are
* different compared to ColdFire mcf5441x 64 channels edma.
*
* This function sets up register offsets as per proper declared version
* so must be called in xxx_edma_probe() just after setting the
* edma "version" and "membase" appropriately.
*/
void fsl_edma_setup_regs(struct fsl_edma_engine *edma)
{
bool is64 = !!(edma->drvdata->flags & FSL_EDMA_DRV_EDMA64);
edma->regs.cr = edma->membase + EDMA_CR;
edma->regs.es = edma->membase + EDMA_ES;
edma->regs.erql = edma->membase + EDMA_ERQ;
edma->regs.eeil = edma->membase + EDMA_EEI;
edma->regs.serq = edma->membase + (is64 ? EDMA64_SERQ : EDMA_SERQ);
edma->regs.cerq = edma->membase + (is64 ? EDMA64_CERQ : EDMA_CERQ);
edma->regs.seei = edma->membase + (is64 ? EDMA64_SEEI : EDMA_SEEI);
edma->regs.ceei = edma->membase + (is64 ? EDMA64_CEEI : EDMA_CEEI);
edma->regs.cint = edma->membase + (is64 ? EDMA64_CINT : EDMA_CINT);
edma->regs.cerr = edma->membase + (is64 ? EDMA64_CERR : EDMA_CERR);
edma->regs.ssrt = edma->membase + (is64 ? EDMA64_SSRT : EDMA_SSRT);
edma->regs.cdne = edma->membase + (is64 ? EDMA64_CDNE : EDMA_CDNE);
edma->regs.intl = edma->membase + (is64 ? EDMA64_INTL : EDMA_INTR);
edma->regs.errl = edma->membase + (is64 ? EDMA64_ERRL : EDMA_ERR);
if (is64) {
edma->regs.erqh = edma->membase + EDMA64_ERQH;
edma->regs.eeih = edma->membase + EDMA64_EEIH;
edma->regs.errh = edma->membase + EDMA64_ERRH;
edma->regs.inth = edma->membase + EDMA64_INTH;
}
}
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/fsl-edma-common.c |
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2019 Linaro Ltd.
// Copyright (C) 2019 Socionext Inc.
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/bitfield.h>
#include "virt-dma.h"
#define MLB_HDMAC_DMACR 0x0 /* global */
#define MLB_HDMAC_DE BIT(31)
#define MLB_HDMAC_DS BIT(30)
#define MLB_HDMAC_PR BIT(28)
#define MLB_HDMAC_DH GENMASK(27, 24)
#define MLB_HDMAC_CH_STRIDE 0x10
#define MLB_HDMAC_DMACA 0x0 /* channel */
#define MLB_HDMAC_EB BIT(31)
#define MLB_HDMAC_PB BIT(30)
#define MLB_HDMAC_ST BIT(29)
#define MLB_HDMAC_IS GENMASK(28, 24)
#define MLB_HDMAC_BT GENMASK(23, 20)
#define MLB_HDMAC_BC GENMASK(19, 16)
#define MLB_HDMAC_TC GENMASK(15, 0)
#define MLB_HDMAC_DMACB 0x4
#define MLB_HDMAC_TT GENMASK(31, 30)
#define MLB_HDMAC_MS GENMASK(29, 28)
#define MLB_HDMAC_TW GENMASK(27, 26)
#define MLB_HDMAC_FS BIT(25)
#define MLB_HDMAC_FD BIT(24)
#define MLB_HDMAC_RC BIT(23)
#define MLB_HDMAC_RS BIT(22)
#define MLB_HDMAC_RD BIT(21)
#define MLB_HDMAC_EI BIT(20)
#define MLB_HDMAC_CI BIT(19)
#define HDMAC_PAUSE 0x7
#define MLB_HDMAC_SS GENMASK(18, 16)
#define MLB_HDMAC_SP GENMASK(15, 12)
#define MLB_HDMAC_DP GENMASK(11, 8)
#define MLB_HDMAC_DMACSA 0x8
#define MLB_HDMAC_DMACDA 0xc
#define MLB_HDMAC_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
struct milbeaut_hdmac_desc {
struct virt_dma_desc vd;
struct scatterlist *sgl;
unsigned int sg_len;
unsigned int sg_cur;
enum dma_transfer_direction dir;
};
struct milbeaut_hdmac_chan {
struct virt_dma_chan vc;
struct milbeaut_hdmac_device *mdev;
struct milbeaut_hdmac_desc *md;
void __iomem *reg_ch_base;
unsigned int slave_id;
struct dma_slave_config cfg;
};
struct milbeaut_hdmac_device {
struct dma_device ddev;
struct clk *clk;
void __iomem *reg_base;
struct milbeaut_hdmac_chan channels[];
};
static struct milbeaut_hdmac_chan *
to_milbeaut_hdmac_chan(struct virt_dma_chan *vc)
{
return container_of(vc, struct milbeaut_hdmac_chan, vc);
}
static struct milbeaut_hdmac_desc *
to_milbeaut_hdmac_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct milbeaut_hdmac_desc, vd);
}
/* mc->vc.lock must be held by caller */
static struct milbeaut_hdmac_desc *
milbeaut_hdmac_next_desc(struct milbeaut_hdmac_chan *mc)
{
struct virt_dma_desc *vd;
vd = vchan_next_desc(&mc->vc);
if (!vd) {
mc->md = NULL;
return NULL;
}
list_del(&vd->node);
mc->md = to_milbeaut_hdmac_desc(vd);
return mc->md;
}
/* mc->vc.lock must be held by caller */
static void milbeaut_chan_start(struct milbeaut_hdmac_chan *mc,
struct milbeaut_hdmac_desc *md)
{
struct scatterlist *sg;
u32 cb, ca, src_addr, dest_addr, len;
u32 width, burst;
sg = &md->sgl[md->sg_cur];
len = sg_dma_len(sg);
cb = MLB_HDMAC_CI | MLB_HDMAC_EI;
if (md->dir == DMA_MEM_TO_DEV) {
cb |= MLB_HDMAC_FD;
width = mc->cfg.dst_addr_width;
burst = mc->cfg.dst_maxburst;
src_addr = sg_dma_address(sg);
dest_addr = mc->cfg.dst_addr;
} else {
cb |= MLB_HDMAC_FS;
width = mc->cfg.src_addr_width;
burst = mc->cfg.src_maxburst;
src_addr = mc->cfg.src_addr;
dest_addr = sg_dma_address(sg);
}
cb |= FIELD_PREP(MLB_HDMAC_TW, (width >> 1));
cb |= FIELD_PREP(MLB_HDMAC_MS, 2);
writel_relaxed(MLB_HDMAC_DE, mc->mdev->reg_base + MLB_HDMAC_DMACR);
writel_relaxed(src_addr, mc->reg_ch_base + MLB_HDMAC_DMACSA);
writel_relaxed(dest_addr, mc->reg_ch_base + MLB_HDMAC_DMACDA);
writel_relaxed(cb, mc->reg_ch_base + MLB_HDMAC_DMACB);
ca = FIELD_PREP(MLB_HDMAC_IS, mc->slave_id);
if (burst == 16)
ca |= FIELD_PREP(MLB_HDMAC_BT, 0xf);
else if (burst == 8)
ca |= FIELD_PREP(MLB_HDMAC_BT, 0xd);
else if (burst == 4)
ca |= FIELD_PREP(MLB_HDMAC_BT, 0xb);
burst *= width;
ca |= FIELD_PREP(MLB_HDMAC_TC, (len / burst - 1));
writel_relaxed(ca, mc->reg_ch_base + MLB_HDMAC_DMACA);
ca |= MLB_HDMAC_EB;
writel_relaxed(ca, mc->reg_ch_base + MLB_HDMAC_DMACA);
}
/* mc->vc.lock must be held by caller */
static void milbeaut_hdmac_start(struct milbeaut_hdmac_chan *mc)
{
struct milbeaut_hdmac_desc *md;
md = milbeaut_hdmac_next_desc(mc);
if (md)
milbeaut_chan_start(mc, md);
}
static irqreturn_t milbeaut_hdmac_interrupt(int irq, void *dev_id)
{
struct milbeaut_hdmac_chan *mc = dev_id;
struct milbeaut_hdmac_desc *md;
u32 val;
spin_lock(&mc->vc.lock);
/* Ack and Disable irqs */
val = readl_relaxed(mc->reg_ch_base + MLB_HDMAC_DMACB);
val &= ~(FIELD_PREP(MLB_HDMAC_SS, HDMAC_PAUSE));
writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACB);
val &= ~MLB_HDMAC_EI;
val &= ~MLB_HDMAC_CI;
writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACB);
md = mc->md;
if (!md)
goto out;
md->sg_cur++;
if (md->sg_cur >= md->sg_len) {
vchan_cookie_complete(&md->vd);
md = milbeaut_hdmac_next_desc(mc);
if (!md)
goto out;
}
milbeaut_chan_start(mc, md);
out:
spin_unlock(&mc->vc.lock);
return IRQ_HANDLED;
}
static void milbeaut_hdmac_free_chan_resources(struct dma_chan *chan)
{
vchan_free_chan_resources(to_virt_chan(chan));
}
static int
milbeaut_hdmac_chan_config(struct dma_chan *chan, struct dma_slave_config *cfg)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
spin_lock(&mc->vc.lock);
mc->cfg = *cfg;
spin_unlock(&mc->vc.lock);
return 0;
}
static int milbeaut_hdmac_chan_pause(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
u32 val;
spin_lock(&mc->vc.lock);
val = readl_relaxed(mc->reg_ch_base + MLB_HDMAC_DMACA);
val |= MLB_HDMAC_PB;
writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACA);
spin_unlock(&mc->vc.lock);
return 0;
}
static int milbeaut_hdmac_chan_resume(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
u32 val;
spin_lock(&mc->vc.lock);
val = readl_relaxed(mc->reg_ch_base + MLB_HDMAC_DMACA);
val &= ~MLB_HDMAC_PB;
writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACA);
spin_unlock(&mc->vc.lock);
return 0;
}
static struct dma_async_tx_descriptor *
milbeaut_hdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct milbeaut_hdmac_desc *md;
int i;
if (!is_slave_direction(direction))
return NULL;
md = kzalloc(sizeof(*md), GFP_NOWAIT);
if (!md)
return NULL;
md->sgl = kcalloc(sg_len, sizeof(*sgl), GFP_NOWAIT);
if (!md->sgl) {
kfree(md);
return NULL;
}
for (i = 0; i < sg_len; i++)
md->sgl[i] = sgl[i];
md->sg_len = sg_len;
md->dir = direction;
return vchan_tx_prep(vc, &md->vd, flags);
}
static int milbeaut_hdmac_terminate_all(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
unsigned long flags;
u32 val;
LIST_HEAD(head);
spin_lock_irqsave(&vc->lock, flags);
val = readl_relaxed(mc->reg_ch_base + MLB_HDMAC_DMACA);
val &= ~MLB_HDMAC_EB; /* disable the channel */
writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACA);
if (mc->md) {
vchan_terminate_vdesc(&mc->md->vd);
mc->md = NULL;
}
vchan_get_all_descriptors(vc, &head);
spin_unlock_irqrestore(&vc->lock, flags);
vchan_dma_desc_free_list(vc, &head);
return 0;
}
static void milbeaut_hdmac_synchronize(struct dma_chan *chan)
{
vchan_synchronize(to_virt_chan(chan));
}
static enum dma_status milbeaut_hdmac_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct virt_dma_chan *vc;
struct virt_dma_desc *vd;
struct milbeaut_hdmac_chan *mc;
struct milbeaut_hdmac_desc *md = NULL;
enum dma_status stat;
unsigned long flags;
int i;
stat = dma_cookie_status(chan, cookie, txstate);
/* Return immediately if we do not need to compute the residue. */
if (stat == DMA_COMPLETE || !txstate)
return stat;
vc = to_virt_chan(chan);
spin_lock_irqsave(&vc->lock, flags);
mc = to_milbeaut_hdmac_chan(vc);
/* residue from the on-flight chunk */
if (mc->md && mc->md->vd.tx.cookie == cookie) {
struct scatterlist *sg;
u32 done;
md = mc->md;
sg = &md->sgl[md->sg_cur];
if (md->dir == DMA_DEV_TO_MEM)
done = readl_relaxed(mc->reg_ch_base
+ MLB_HDMAC_DMACDA);
else
done = readl_relaxed(mc->reg_ch_base
+ MLB_HDMAC_DMACSA);
done -= sg_dma_address(sg);
txstate->residue = -done;
}
if (!md) {
vd = vchan_find_desc(vc, cookie);
if (vd)
md = to_milbeaut_hdmac_desc(vd);
}
if (md) {
/* residue from the queued chunks */
for (i = md->sg_cur; i < md->sg_len; i++)
txstate->residue += sg_dma_len(&md->sgl[i]);
}
spin_unlock_irqrestore(&vc->lock, flags);
return stat;
}
static void milbeaut_hdmac_issue_pending(struct dma_chan *chan)
{
struct virt_dma_chan *vc = to_virt_chan(chan);
struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
unsigned long flags;
spin_lock_irqsave(&vc->lock, flags);
if (vchan_issue_pending(vc) && !mc->md)
milbeaut_hdmac_start(mc);
spin_unlock_irqrestore(&vc->lock, flags);
}
static void milbeaut_hdmac_desc_free(struct virt_dma_desc *vd)
{
struct milbeaut_hdmac_desc *md = to_milbeaut_hdmac_desc(vd);
kfree(md->sgl);
kfree(md);
}
static struct dma_chan *
milbeaut_hdmac_xlate(struct of_phandle_args *dma_spec, struct of_dma *of_dma)
{
struct milbeaut_hdmac_device *mdev = of_dma->of_dma_data;
struct milbeaut_hdmac_chan *mc;
struct virt_dma_chan *vc;
struct dma_chan *chan;
if (dma_spec->args_count != 1)
return NULL;
chan = dma_get_any_slave_channel(&mdev->ddev);
if (!chan)
return NULL;
vc = to_virt_chan(chan);
mc = to_milbeaut_hdmac_chan(vc);
mc->slave_id = dma_spec->args[0];
return chan;
}
static int milbeaut_hdmac_chan_init(struct platform_device *pdev,
struct milbeaut_hdmac_device *mdev,
int chan_id)
{
struct device *dev = &pdev->dev;
struct milbeaut_hdmac_chan *mc = &mdev->channels[chan_id];
char *irq_name;
int irq, ret;
irq = platform_get_irq(pdev, chan_id);
if (irq < 0)
return irq;
irq_name = devm_kasprintf(dev, GFP_KERNEL, "milbeaut-hdmac-%d",
chan_id);
if (!irq_name)
return -ENOMEM;
ret = devm_request_irq(dev, irq, milbeaut_hdmac_interrupt,
IRQF_SHARED, irq_name, mc);
if (ret)
return ret;
mc->mdev = mdev;
mc->reg_ch_base = mdev->reg_base + MLB_HDMAC_CH_STRIDE * (chan_id + 1);
mc->vc.desc_free = milbeaut_hdmac_desc_free;
vchan_init(&mc->vc, &mdev->ddev);
return 0;
}
static int milbeaut_hdmac_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct milbeaut_hdmac_device *mdev;
struct dma_device *ddev;
int nr_chans, ret, i;
nr_chans = platform_irq_count(pdev);
if (nr_chans < 0)
return nr_chans;
ret = dma_set_mask(dev, DMA_BIT_MASK(32));
if (ret)
return ret;
mdev = devm_kzalloc(dev, struct_size(mdev, channels, nr_chans),
GFP_KERNEL);
if (!mdev)
return -ENOMEM;
mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mdev->reg_base))
return PTR_ERR(mdev->reg_base);
mdev->clk = devm_clk_get(dev, NULL);
if (IS_ERR(mdev->clk)) {
dev_err(dev, "failed to get clock\n");
return PTR_ERR(mdev->clk);
}
ret = clk_prepare_enable(mdev->clk);
if (ret)
return ret;
ddev = &mdev->ddev;
ddev->dev = dev;
dma_cap_set(DMA_SLAVE, ddev->cap_mask);
dma_cap_set(DMA_PRIVATE, ddev->cap_mask);
ddev->src_addr_widths = MLB_HDMAC_BUSWIDTHS;
ddev->dst_addr_widths = MLB_HDMAC_BUSWIDTHS;
ddev->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
ddev->device_free_chan_resources = milbeaut_hdmac_free_chan_resources;
ddev->device_config = milbeaut_hdmac_chan_config;
ddev->device_pause = milbeaut_hdmac_chan_pause;
ddev->device_resume = milbeaut_hdmac_chan_resume;
ddev->device_prep_slave_sg = milbeaut_hdmac_prep_slave_sg;
ddev->device_terminate_all = milbeaut_hdmac_terminate_all;
ddev->device_synchronize = milbeaut_hdmac_synchronize;
ddev->device_tx_status = milbeaut_hdmac_tx_status;
ddev->device_issue_pending = milbeaut_hdmac_issue_pending;
INIT_LIST_HEAD(&ddev->channels);
for (i = 0; i < nr_chans; i++) {
ret = milbeaut_hdmac_chan_init(pdev, mdev, i);
if (ret)
goto disable_clk;
}
ret = dma_async_device_register(ddev);
if (ret)
goto disable_clk;
ret = of_dma_controller_register(dev->of_node,
milbeaut_hdmac_xlate, mdev);
if (ret)
goto unregister_dmac;
platform_set_drvdata(pdev, mdev);
return 0;
unregister_dmac:
dma_async_device_unregister(ddev);
disable_clk:
clk_disable_unprepare(mdev->clk);
return ret;
}
static int milbeaut_hdmac_remove(struct platform_device *pdev)
{
struct milbeaut_hdmac_device *mdev = platform_get_drvdata(pdev);
struct dma_chan *chan;
int ret;
/*
* Before reaching here, almost all descriptors have been freed by the
* ->device_free_chan_resources() hook. However, each channel might
* be still holding one descriptor that was on-flight at that moment.
* Terminate it to make sure this hardware is no longer running. Then,
* free the channel resources once again to avoid memory leak.
*/
list_for_each_entry(chan, &mdev->ddev.channels, device_node) {
ret = dmaengine_terminate_sync(chan);
if (ret)
return ret;
milbeaut_hdmac_free_chan_resources(chan);
}
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&mdev->ddev);
clk_disable_unprepare(mdev->clk);
return 0;
}
static const struct of_device_id milbeaut_hdmac_match[] = {
{ .compatible = "socionext,milbeaut-m10v-hdmac" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, milbeaut_hdmac_match);
static struct platform_driver milbeaut_hdmac_driver = {
.probe = milbeaut_hdmac_probe,
.remove = milbeaut_hdmac_remove,
.driver = {
.name = "milbeaut-m10v-hdmac",
.of_match_table = milbeaut_hdmac_match,
},
};
module_platform_driver(milbeaut_hdmac_driver);
MODULE_DESCRIPTION("Milbeaut HDMAC DmaEngine driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/milbeaut-hdmac.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for the Atmel AHB DMA Controller (aka HDMA or DMAC on AT91 systems)
*
* Copyright (C) 2008 Atmel Corporation
* Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries
*
* This supports the Atmel AHB DMA Controller found in several Atmel SoCs.
* The only Atmel DMA Controller that is not covered by this driver is the one
* found on AT91SAM9263.
*/
#include <dt-bindings/dma/at91.h>
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/overflow.h>
#include <linux/of_platform.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "dmaengine.h"
#include "virt-dma.h"
/*
* Glossary
* --------
*
* at_hdmac : Name of the ATmel AHB DMA Controller
* at_dma_ / atdma : ATmel DMA controller entity related
* atc_ / atchan : ATmel DMA Channel entity related
*/
#define AT_DMA_MAX_NR_CHANNELS 8
/* Global Configuration Register */
#define AT_DMA_GCFG 0x00
#define AT_DMA_IF_BIGEND(i) BIT((i)) /* AHB-Lite Interface i in Big-endian mode */
#define AT_DMA_ARB_CFG BIT(4) /* Arbiter mode. */
/* Controller Enable Register */
#define AT_DMA_EN 0x04
#define AT_DMA_ENABLE BIT(0)
/* Software Single Request Register */
#define AT_DMA_SREQ 0x08
#define AT_DMA_SSREQ(x) BIT((x) << 1) /* Request a source single transfer on channel x */
#define AT_DMA_DSREQ(x) BIT(1 + ((x) << 1)) /* Request a destination single transfer on channel x */
/* Software Chunk Transfer Request Register */
#define AT_DMA_CREQ 0x0c
#define AT_DMA_SCREQ(x) BIT((x) << 1) /* Request a source chunk transfer on channel x */
#define AT_DMA_DCREQ(x) BIT(1 + ((x) << 1)) /* Request a destination chunk transfer on channel x */
/* Software Last Transfer Flag Register */
#define AT_DMA_LAST 0x10
#define AT_DMA_SLAST(x) BIT((x) << 1) /* This src rq is last tx of buffer on channel x */
#define AT_DMA_DLAST(x) BIT(1 + ((x) << 1)) /* This dst rq is last tx of buffer on channel x */
/* Request Synchronization Register */
#define AT_DMA_SYNC 0x14
#define AT_DMA_SYR(h) BIT((h)) /* Synchronize handshake line h */
/* Error, Chained Buffer transfer completed and Buffer transfer completed Interrupt registers */
#define AT_DMA_EBCIER 0x18 /* Enable register */
#define AT_DMA_EBCIDR 0x1c /* Disable register */
#define AT_DMA_EBCIMR 0x20 /* Mask Register */
#define AT_DMA_EBCISR 0x24 /* Status Register */
#define AT_DMA_CBTC_OFFSET 8
#define AT_DMA_ERR_OFFSET 16
#define AT_DMA_BTC(x) BIT((x))
#define AT_DMA_CBTC(x) BIT(AT_DMA_CBTC_OFFSET + (x))
#define AT_DMA_ERR(x) BIT(AT_DMA_ERR_OFFSET + (x))
/* Channel Handler Enable Register */
#define AT_DMA_CHER 0x28
#define AT_DMA_ENA(x) BIT((x))
#define AT_DMA_SUSP(x) BIT(8 + (x))
#define AT_DMA_KEEP(x) BIT(24 + (x))
/* Channel Handler Disable Register */
#define AT_DMA_CHDR 0x2c
#define AT_DMA_DIS(x) BIT(x)
#define AT_DMA_RES(x) BIT(8 + (x))
/* Channel Handler Status Register */
#define AT_DMA_CHSR 0x30
#define AT_DMA_EMPT(x) BIT(16 + (x))
#define AT_DMA_STAL(x) BIT(24 + (x))
/* Channel registers base address */
#define AT_DMA_CH_REGS_BASE 0x3c
#define ch_regs(x) (AT_DMA_CH_REGS_BASE + (x) * 0x28) /* Channel x base addr */
/* Hardware register offset for each channel */
#define ATC_SADDR_OFFSET 0x00 /* Source Address Register */
#define ATC_DADDR_OFFSET 0x04 /* Destination Address Register */
#define ATC_DSCR_OFFSET 0x08 /* Descriptor Address Register */
#define ATC_CTRLA_OFFSET 0x0c /* Control A Register */
#define ATC_CTRLB_OFFSET 0x10 /* Control B Register */
#define ATC_CFG_OFFSET 0x14 /* Configuration Register */
#define ATC_SPIP_OFFSET 0x18 /* Src PIP Configuration Register */
#define ATC_DPIP_OFFSET 0x1c /* Dst PIP Configuration Register */
/* Bitfield definitions */
/* Bitfields in DSCR */
#define ATC_DSCR_IF GENMASK(1, 0) /* Dsc feched via AHB-Lite Interface */
/* Bitfields in CTRLA */
#define ATC_BTSIZE_MAX GENMASK(15, 0) /* Maximum Buffer Transfer Size */
#define ATC_BTSIZE GENMASK(15, 0) /* Buffer Transfer Size */
#define ATC_SCSIZE GENMASK(18, 16) /* Source Chunk Transfer Size */
#define ATC_DCSIZE GENMASK(22, 20) /* Destination Chunk Transfer Size */
#define ATC_SRC_WIDTH GENMASK(25, 24) /* Source Single Transfer Size */
#define ATC_DST_WIDTH GENMASK(29, 28) /* Destination Single Transfer Size */
#define ATC_DONE BIT(31) /* Tx Done (only written back in descriptor) */
/* Bitfields in CTRLB */
#define ATC_SIF GENMASK(1, 0) /* Src tx done via AHB-Lite Interface i */
#define ATC_DIF GENMASK(5, 4) /* Dst tx done via AHB-Lite Interface i */
#define AT_DMA_MEM_IF 0x0 /* interface 0 as memory interface */
#define AT_DMA_PER_IF 0x1 /* interface 1 as peripheral interface */
#define ATC_SRC_PIP BIT(8) /* Source Picture-in-Picture enabled */
#define ATC_DST_PIP BIT(12) /* Destination Picture-in-Picture enabled */
#define ATC_SRC_DSCR_DIS BIT(16) /* Src Descriptor fetch disable */
#define ATC_DST_DSCR_DIS BIT(20) /* Dst Descriptor fetch disable */
#define ATC_FC GENMASK(23, 21) /* Choose Flow Controller */
#define ATC_FC_MEM2MEM 0x0 /* Mem-to-Mem (DMA) */
#define ATC_FC_MEM2PER 0x1 /* Mem-to-Periph (DMA) */
#define ATC_FC_PER2MEM 0x2 /* Periph-to-Mem (DMA) */
#define ATC_FC_PER2PER 0x3 /* Periph-to-Periph (DMA) */
#define ATC_FC_PER2MEM_PER 0x4 /* Periph-to-Mem (Peripheral) */
#define ATC_FC_MEM2PER_PER 0x5 /* Mem-to-Periph (Peripheral) */
#define ATC_FC_PER2PER_SRCPER 0x6 /* Periph-to-Periph (Src Peripheral) */
#define ATC_FC_PER2PER_DSTPER 0x7 /* Periph-to-Periph (Dst Peripheral) */
#define ATC_SRC_ADDR_MODE GENMASK(25, 24)
#define ATC_SRC_ADDR_MODE_INCR 0x0 /* Incrementing Mode */
#define ATC_SRC_ADDR_MODE_DECR 0x1 /* Decrementing Mode */
#define ATC_SRC_ADDR_MODE_FIXED 0x2 /* Fixed Mode */
#define ATC_DST_ADDR_MODE GENMASK(29, 28)
#define ATC_DST_ADDR_MODE_INCR 0x0 /* Incrementing Mode */
#define ATC_DST_ADDR_MODE_DECR 0x1 /* Decrementing Mode */
#define ATC_DST_ADDR_MODE_FIXED 0x2 /* Fixed Mode */
#define ATC_IEN BIT(30) /* BTC interrupt enable (active low) */
#define ATC_AUTO BIT(31) /* Auto multiple buffer tx enable */
/* Bitfields in CFG */
#define ATC_SRC_PER GENMASK(3, 0) /* Channel src rq associated with periph handshaking ifc h */
#define ATC_DST_PER GENMASK(7, 4) /* Channel dst rq associated with periph handshaking ifc h */
#define ATC_SRC_REP BIT(8) /* Source Replay Mod */
#define ATC_SRC_H2SEL BIT(9) /* Source Handshaking Mod */
#define ATC_SRC_PER_MSB GENMASK(11, 10) /* Channel src rq (most significant bits) */
#define ATC_DST_REP BIT(12) /* Destination Replay Mod */
#define ATC_DST_H2SEL BIT(13) /* Destination Handshaking Mod */
#define ATC_DST_PER_MSB GENMASK(15, 14) /* Channel dst rq (most significant bits) */
#define ATC_SOD BIT(16) /* Stop On Done */
#define ATC_LOCK_IF BIT(20) /* Interface Lock */
#define ATC_LOCK_B BIT(21) /* AHB Bus Lock */
#define ATC_LOCK_IF_L BIT(22) /* Master Interface Arbiter Lock */
#define ATC_AHB_PROT GENMASK(26, 24) /* AHB Protection */
#define ATC_FIFOCFG GENMASK(29, 28) /* FIFO Request Configuration */
#define ATC_FIFOCFG_LARGESTBURST 0x0
#define ATC_FIFOCFG_HALFFIFO 0x1
#define ATC_FIFOCFG_ENOUGHSPACE 0x2
/* Bitfields in SPIP */
#define ATC_SPIP_HOLE GENMASK(15, 0)
#define ATC_SPIP_BOUNDARY GENMASK(25, 16)
/* Bitfields in DPIP */
#define ATC_DPIP_HOLE GENMASK(15, 0)
#define ATC_DPIP_BOUNDARY GENMASK(25, 16)
#define ATC_PER_MSB GENMASK(5, 4) /* Extract MSBs of a handshaking identifier */
#define ATC_SRC_PER_ID(id) \
({ typeof(id) _id = (id); \
FIELD_PREP(ATC_SRC_PER_MSB, FIELD_GET(ATC_PER_MSB, _id)) | \
FIELD_PREP(ATC_SRC_PER, _id); })
#define ATC_DST_PER_ID(id) \
({ typeof(id) _id = (id); \
FIELD_PREP(ATC_DST_PER_MSB, FIELD_GET(ATC_PER_MSB, _id)) | \
FIELD_PREP(ATC_DST_PER, _id); })
/*-- descriptors -----------------------------------------------------*/
/* LLI == Linked List Item; aka DMA buffer descriptor */
struct at_lli {
/* values that are not changed by hardware */
u32 saddr;
u32 daddr;
/* value that may get written back: */
u32 ctrla;
/* more values that are not changed by hardware */
u32 ctrlb;
u32 dscr; /* chain to next lli */
};
/**
* struct atdma_sg - atdma scatter gather entry
* @len: length of the current Linked List Item.
* @lli: linked list item that is passed to the DMA controller
* @lli_phys: physical address of the LLI.
*/
struct atdma_sg {
unsigned int len;
struct at_lli *lli;
dma_addr_t lli_phys;
};
/**
* struct at_desc - software descriptor
* @vd: pointer to the virtual dma descriptor.
* @atchan: pointer to the atmel dma channel.
* @total_len: total transaction byte count
* @sg_len: number of sg entries.
* @sg: array of sgs.
*/
struct at_desc {
struct virt_dma_desc vd;
struct at_dma_chan *atchan;
size_t total_len;
unsigned int sglen;
/* Interleaved data */
size_t boundary;
size_t dst_hole;
size_t src_hole;
/* Memset temporary buffer */
bool memset_buffer;
dma_addr_t memset_paddr;
int *memset_vaddr;
struct atdma_sg sg[];
};
/*-- Channels --------------------------------------------------------*/
/**
* atc_status - information bits stored in channel status flag
*
* Manipulated with atomic operations.
*/
enum atc_status {
ATC_IS_PAUSED = 1,
ATC_IS_CYCLIC = 24,
};
/**
* struct at_dma_chan - internal representation of an Atmel HDMAC channel
* @vc: virtual dma channel entry.
* @atdma: pointer to the driver data.
* @ch_regs: memory mapped register base
* @mask: channel index in a mask
* @per_if: peripheral interface
* @mem_if: memory interface
* @status: transmit status information from irq/prep* functions
* to tasklet (use atomic operations)
* @save_cfg: configuration register that is saved on suspend/resume cycle
* @save_dscr: for cyclic operations, preserve next descriptor address in
* the cyclic list on suspend/resume cycle
* @dma_sconfig: configuration for slave transfers, passed via
* .device_config
* @desc: pointer to the atmel dma descriptor.
*/
struct at_dma_chan {
struct virt_dma_chan vc;
struct at_dma *atdma;
void __iomem *ch_regs;
u8 mask;
u8 per_if;
u8 mem_if;
unsigned long status;
u32 save_cfg;
u32 save_dscr;
struct dma_slave_config dma_sconfig;
bool cyclic;
struct at_desc *desc;
};
#define channel_readl(atchan, name) \
__raw_readl((atchan)->ch_regs + ATC_##name##_OFFSET)
#define channel_writel(atchan, name, val) \
__raw_writel((val), (atchan)->ch_regs + ATC_##name##_OFFSET)
/*
* Fix sconfig's burst size according to at_hdmac. We need to convert them as:
* 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3, 32 -> 4, 64 -> 5, 128 -> 6, 256 -> 7.
*
* This can be done by finding most significant bit set.
*/
static inline void convert_burst(u32 *maxburst)
{
if (*maxburst > 1)
*maxburst = fls(*maxburst) - 2;
else
*maxburst = 0;
}
/*
* Fix sconfig's bus width according to at_hdmac.
* 1 byte -> 0, 2 bytes -> 1, 4 bytes -> 2.
*/
static inline u8 convert_buswidth(enum dma_slave_buswidth addr_width)
{
switch (addr_width) {
case DMA_SLAVE_BUSWIDTH_2_BYTES:
return 1;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
return 2;
default:
/* For 1 byte width or fallback */
return 0;
}
}
/*-- Controller ------------------------------------------------------*/
/**
* struct at_dma - internal representation of an Atmel HDMA Controller
* @dma_device: dmaengine dma_device object members
* @atdma_devtype: identifier of DMA controller compatibility
* @ch_regs: memory mapped register base
* @clk: dma controller clock
* @save_imr: interrupt mask register that is saved on suspend/resume cycle
* @all_chan_mask: all channels availlable in a mask
* @lli_pool: hw lli table
* @chan: channels table to store at_dma_chan structures
*/
struct at_dma {
struct dma_device dma_device;
void __iomem *regs;
struct clk *clk;
u32 save_imr;
u8 all_chan_mask;
struct dma_pool *lli_pool;
struct dma_pool *memset_pool;
/* AT THE END channels table */
struct at_dma_chan chan[];
};
#define dma_readl(atdma, name) \
__raw_readl((atdma)->regs + AT_DMA_##name)
#define dma_writel(atdma, name, val) \
__raw_writel((val), (atdma)->regs + AT_DMA_##name)
static inline struct at_desc *to_atdma_desc(struct dma_async_tx_descriptor *t)
{
return container_of(t, struct at_desc, vd.tx);
}
static inline struct at_dma_chan *to_at_dma_chan(struct dma_chan *chan)
{
return container_of(chan, struct at_dma_chan, vc.chan);
}
static inline struct at_dma *to_at_dma(struct dma_device *ddev)
{
return container_of(ddev, struct at_dma, dma_device);
}
/*-- Helper functions ------------------------------------------------*/
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
#if defined(VERBOSE_DEBUG)
static void vdbg_dump_regs(struct at_dma_chan *atchan)
{
struct at_dma *atdma = to_at_dma(atchan->vc.chan.device);
dev_err(chan2dev(&atchan->vc.chan),
" channel %d : imr = 0x%x, chsr = 0x%x\n",
atchan->vc.chan.chan_id,
dma_readl(atdma, EBCIMR),
dma_readl(atdma, CHSR));
dev_err(chan2dev(&atchan->vc.chan),
" channel: s0x%x d0x%x ctrl0x%x:0x%x cfg0x%x l0x%x\n",
channel_readl(atchan, SADDR),
channel_readl(atchan, DADDR),
channel_readl(atchan, CTRLA),
channel_readl(atchan, CTRLB),
channel_readl(atchan, CFG),
channel_readl(atchan, DSCR));
}
#else
static void vdbg_dump_regs(struct at_dma_chan *atchan) {}
#endif
static void atc_dump_lli(struct at_dma_chan *atchan, struct at_lli *lli)
{
dev_crit(chan2dev(&atchan->vc.chan),
"desc: s%pad d%pad ctrl0x%x:0x%x l%pad\n",
&lli->saddr, &lli->daddr,
lli->ctrla, lli->ctrlb, &lli->dscr);
}
static void atc_setup_irq(struct at_dma *atdma, int chan_id, int on)
{
u32 ebci;
/* enable interrupts on buffer transfer completion & error */
ebci = AT_DMA_BTC(chan_id)
| AT_DMA_ERR(chan_id);
if (on)
dma_writel(atdma, EBCIER, ebci);
else
dma_writel(atdma, EBCIDR, ebci);
}
static void atc_enable_chan_irq(struct at_dma *atdma, int chan_id)
{
atc_setup_irq(atdma, chan_id, 1);
}
static void atc_disable_chan_irq(struct at_dma *atdma, int chan_id)
{
atc_setup_irq(atdma, chan_id, 0);
}
/**
* atc_chan_is_enabled - test if given channel is enabled
* @atchan: channel we want to test status
*/
static inline int atc_chan_is_enabled(struct at_dma_chan *atchan)
{
struct at_dma *atdma = to_at_dma(atchan->vc.chan.device);
return !!(dma_readl(atdma, CHSR) & atchan->mask);
}
/**
* atc_chan_is_paused - test channel pause/resume status
* @atchan: channel we want to test status
*/
static inline int atc_chan_is_paused(struct at_dma_chan *atchan)
{
return test_bit(ATC_IS_PAUSED, &atchan->status);
}
/**
* atc_chan_is_cyclic - test if given channel has cyclic property set
* @atchan: channel we want to test status
*/
static inline int atc_chan_is_cyclic(struct at_dma_chan *atchan)
{
return test_bit(ATC_IS_CYCLIC, &atchan->status);
}
/**
* set_lli_eol - set end-of-link to descriptor so it will end transfer
* @desc: descriptor, signle or at the end of a chain, to end chain on
* @i: index of the atmel scatter gather entry that is at the end of the chain.
*/
static void set_lli_eol(struct at_desc *desc, unsigned int i)
{
u32 ctrlb = desc->sg[i].lli->ctrlb;
ctrlb &= ~ATC_IEN;
ctrlb |= ATC_SRC_DSCR_DIS | ATC_DST_DSCR_DIS;
desc->sg[i].lli->ctrlb = ctrlb;
desc->sg[i].lli->dscr = 0;
}
#define ATC_DEFAULT_CFG FIELD_PREP(ATC_FIFOCFG, ATC_FIFOCFG_HALFFIFO)
#define ATC_DEFAULT_CTRLB (FIELD_PREP(ATC_SIF, AT_DMA_MEM_IF) | \
FIELD_PREP(ATC_DIF, AT_DMA_MEM_IF))
#define ATC_DMA_BUSWIDTHS\
(BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) |\
BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |\
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |\
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
#define ATC_MAX_DSCR_TRIALS 10
/*
* Initial number of descriptors to allocate for each channel. This could
* be increased during dma usage.
*/
static unsigned int init_nr_desc_per_channel = 64;
module_param(init_nr_desc_per_channel, uint, 0644);
MODULE_PARM_DESC(init_nr_desc_per_channel,
"initial descriptors per channel (default: 64)");
/**
* struct at_dma_platform_data - Controller configuration parameters
* @nr_channels: Number of channels supported by hardware (max 8)
* @cap_mask: dma_capability flags supported by the platform
*/
struct at_dma_platform_data {
unsigned int nr_channels;
dma_cap_mask_t cap_mask;
};
/**
* struct at_dma_slave - Controller-specific information about a slave
* @dma_dev: required DMA master device
* @cfg: Platform-specific initializer for the CFG register
*/
struct at_dma_slave {
struct device *dma_dev;
u32 cfg;
};
static inline unsigned int atc_get_xfer_width(dma_addr_t src, dma_addr_t dst,
size_t len)
{
unsigned int width;
if (!((src | dst | len) & 3))
width = 2;
else if (!((src | dst | len) & 1))
width = 1;
else
width = 0;
return width;
}
static void atdma_lli_chain(struct at_desc *desc, unsigned int i)
{
struct atdma_sg *atdma_sg = &desc->sg[i];
if (i)
desc->sg[i - 1].lli->dscr = atdma_sg->lli_phys;
}
/**
* atc_dostart - starts the DMA engine for real
* @atchan: the channel we want to start
*/
static void atc_dostart(struct at_dma_chan *atchan)
{
struct virt_dma_desc *vd = vchan_next_desc(&atchan->vc);
struct at_desc *desc;
if (!vd) {
atchan->desc = NULL;
return;
}
vdbg_dump_regs(atchan);
list_del(&vd->node);
atchan->desc = desc = to_atdma_desc(&vd->tx);
channel_writel(atchan, SADDR, 0);
channel_writel(atchan, DADDR, 0);
channel_writel(atchan, CTRLA, 0);
channel_writel(atchan, CTRLB, 0);
channel_writel(atchan, DSCR, desc->sg[0].lli_phys);
channel_writel(atchan, SPIP,
FIELD_PREP(ATC_SPIP_HOLE, desc->src_hole) |
FIELD_PREP(ATC_SPIP_BOUNDARY, desc->boundary));
channel_writel(atchan, DPIP,
FIELD_PREP(ATC_DPIP_HOLE, desc->dst_hole) |
FIELD_PREP(ATC_DPIP_BOUNDARY, desc->boundary));
/* Don't allow CPU to reorder channel enable. */
wmb();
dma_writel(atchan->atdma, CHER, atchan->mask);
vdbg_dump_regs(atchan);
}
static void atdma_desc_free(struct virt_dma_desc *vd)
{
struct at_dma *atdma = to_at_dma(vd->tx.chan->device);
struct at_desc *desc = to_atdma_desc(&vd->tx);
unsigned int i;
for (i = 0; i < desc->sglen; i++) {
if (desc->sg[i].lli)
dma_pool_free(atdma->lli_pool, desc->sg[i].lli,
desc->sg[i].lli_phys);
}
/* If the transfer was a memset, free our temporary buffer */
if (desc->memset_buffer) {
dma_pool_free(atdma->memset_pool, desc->memset_vaddr,
desc->memset_paddr);
desc->memset_buffer = false;
}
kfree(desc);
}
/**
* atc_calc_bytes_left - calculates the number of bytes left according to the
* value read from CTRLA.
*
* @current_len: the number of bytes left before reading CTRLA
* @ctrla: the value of CTRLA
*/
static inline u32 atc_calc_bytes_left(u32 current_len, u32 ctrla)
{
u32 btsize = FIELD_GET(ATC_BTSIZE, ctrla);
u32 src_width = FIELD_GET(ATC_SRC_WIDTH, ctrla);
/*
* According to the datasheet, when reading the Control A Register
* (ctrla), the Buffer Transfer Size (btsize) bitfield refers to the
* number of transfers completed on the Source Interface.
* So btsize is always a number of source width transfers.
*/
return current_len - (btsize << src_width);
}
/**
* atc_get_llis_residue - Get residue for a hardware linked list transfer
*
* Calculate the residue by removing the length of the Linked List Item (LLI)
* already transferred from the total length. To get the current LLI we can use
* the value of the channel's DSCR register and compare it against the DSCR
* value of each LLI.
*
* The CTRLA register provides us with the amount of data already read from the
* source for the LLI. So we can compute a more accurate residue by also
* removing the number of bytes corresponding to this amount of data.
*
* However, the DSCR and CTRLA registers cannot be read both atomically. Hence a
* race condition may occur: the first read register may refer to one LLI
* whereas the second read may refer to a later LLI in the list because of the
* DMA transfer progression inbetween the two reads.
*
* One solution could have been to pause the DMA transfer, read the DSCR and
* CTRLA then resume the DMA transfer. Nonetheless, this approach presents some
* drawbacks:
* - If the DMA transfer is paused, RX overruns or TX underruns are more likey
* to occur depending on the system latency. Taking the USART driver as an
* example, it uses a cyclic DMA transfer to read data from the Receive
* Holding Register (RHR) to avoid RX overruns since the RHR is not protected
* by any FIFO on most Atmel SoCs. So pausing the DMA transfer to compute the
* residue would break the USART driver design.
* - The atc_pause() function masks interrupts but we'd rather avoid to do so
* for system latency purpose.
*
* Then we'd rather use another solution: the DSCR is read a first time, the
* CTRLA is read in turn, next the DSCR is read a second time. If the two
* consecutive read values of the DSCR are the same then we assume both refers
* to the very same LLI as well as the CTRLA value read inbetween does. For
* cyclic tranfers, the assumption is that a full loop is "not so fast". If the
* two DSCR values are different, we read again the CTRLA then the DSCR till two
* consecutive read values from DSCR are equal or till the maximum trials is
* reach. This algorithm is very unlikely not to find a stable value for DSCR.
* @atchan: pointer to an atmel hdmac channel.
* @desc: pointer to the descriptor for which the residue is calculated.
* @residue: residue to be set to dma_tx_state.
* Returns 0 on success, -errno otherwise.
*/
static int atc_get_llis_residue(struct at_dma_chan *atchan,
struct at_desc *desc, u32 *residue)
{
u32 len, ctrla, dscr;
unsigned int i;
len = desc->total_len;
dscr = channel_readl(atchan, DSCR);
rmb(); /* ensure DSCR is read before CTRLA */
ctrla = channel_readl(atchan, CTRLA);
for (i = 0; i < ATC_MAX_DSCR_TRIALS; ++i) {
u32 new_dscr;
rmb(); /* ensure DSCR is read after CTRLA */
new_dscr = channel_readl(atchan, DSCR);
/*
* If the DSCR register value has not changed inside the DMA
* controller since the previous read, we assume that both the
* dscr and ctrla values refers to the very same descriptor.
*/
if (likely(new_dscr == dscr))
break;
/*
* DSCR has changed inside the DMA controller, so the previouly
* read value of CTRLA may refer to an already processed
* descriptor hence could be outdated. We need to update ctrla
* to match the current descriptor.
*/
dscr = new_dscr;
rmb(); /* ensure DSCR is read before CTRLA */
ctrla = channel_readl(atchan, CTRLA);
}
if (unlikely(i == ATC_MAX_DSCR_TRIALS))
return -ETIMEDOUT;
/* For the first descriptor we can be more accurate. */
if (desc->sg[0].lli->dscr == dscr) {
*residue = atc_calc_bytes_left(len, ctrla);
return 0;
}
len -= desc->sg[0].len;
for (i = 1; i < desc->sglen; i++) {
if (desc->sg[i].lli && desc->sg[i].lli->dscr == dscr)
break;
len -= desc->sg[i].len;
}
/*
* For the current LLI in the chain we can calculate the remaining bytes
* using the channel's CTRLA register.
*/
*residue = atc_calc_bytes_left(len, ctrla);
return 0;
}
/**
* atc_get_residue - get the number of bytes residue for a cookie.
* The residue is passed by address and updated on success.
* @chan: DMA channel
* @cookie: transaction identifier to check status of
* @residue: residue to be updated.
* Return 0 on success, -errono otherwise.
*/
static int atc_get_residue(struct dma_chan *chan, dma_cookie_t cookie,
u32 *residue)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct virt_dma_desc *vd;
struct at_desc *desc = NULL;
u32 len, ctrla;
vd = vchan_find_desc(&atchan->vc, cookie);
if (vd)
desc = to_atdma_desc(&vd->tx);
else if (atchan->desc && atchan->desc->vd.tx.cookie == cookie)
desc = atchan->desc;
if (!desc)
return -EINVAL;
if (desc->sg[0].lli->dscr)
/* hardware linked list transfer */
return atc_get_llis_residue(atchan, desc, residue);
/* single transfer */
len = desc->total_len;
ctrla = channel_readl(atchan, CTRLA);
*residue = atc_calc_bytes_left(len, ctrla);
return 0;
}
/**
* atc_handle_error - handle errors reported by DMA controller
* @atchan: channel where error occurs.
* @i: channel index
*/
static void atc_handle_error(struct at_dma_chan *atchan, unsigned int i)
{
struct at_desc *desc = atchan->desc;
/* Disable channel on AHB error */
dma_writel(atchan->atdma, CHDR, AT_DMA_RES(i) | atchan->mask);
/*
* KERN_CRITICAL may seem harsh, but since this only happens
* when someone submits a bad physical address in a
* descriptor, we should consider ourselves lucky that the
* controller flagged an error instead of scribbling over
* random memory locations.
*/
dev_crit(chan2dev(&atchan->vc.chan), "Bad descriptor submitted for DMA!\n");
dev_crit(chan2dev(&atchan->vc.chan), "cookie: %d\n",
desc->vd.tx.cookie);
for (i = 0; i < desc->sglen; i++)
atc_dump_lli(atchan, desc->sg[i].lli);
}
static void atdma_handle_chan_done(struct at_dma_chan *atchan, u32 pending,
unsigned int i)
{
struct at_desc *desc;
spin_lock(&atchan->vc.lock);
desc = atchan->desc;
if (desc) {
if (pending & AT_DMA_ERR(i)) {
atc_handle_error(atchan, i);
/* Pretend the descriptor completed successfully */
}
if (atc_chan_is_cyclic(atchan)) {
vchan_cyclic_callback(&desc->vd);
} else {
vchan_cookie_complete(&desc->vd);
atchan->desc = NULL;
if (!(atc_chan_is_enabled(atchan)))
atc_dostart(atchan);
}
}
spin_unlock(&atchan->vc.lock);
}
static irqreturn_t at_dma_interrupt(int irq, void *dev_id)
{
struct at_dma *atdma = dev_id;
struct at_dma_chan *atchan;
int i;
u32 status, pending, imr;
int ret = IRQ_NONE;
do {
imr = dma_readl(atdma, EBCIMR);
status = dma_readl(atdma, EBCISR);
pending = status & imr;
if (!pending)
break;
dev_vdbg(atdma->dma_device.dev,
"interrupt: status = 0x%08x, 0x%08x, 0x%08x\n",
status, imr, pending);
for (i = 0; i < atdma->dma_device.chancnt; i++) {
atchan = &atdma->chan[i];
if (!(pending & (AT_DMA_BTC(i) | AT_DMA_ERR(i))))
continue;
atdma_handle_chan_done(atchan, pending, i);
ret = IRQ_HANDLED;
}
} while (pending);
return ret;
}
/*-- DMA Engine API --------------------------------------------------*/
/**
* atc_prep_dma_interleaved - prepare memory to memory interleaved operation
* @chan: the channel to prepare operation on
* @xt: Interleaved transfer template
* @flags: tx descriptor status flags
*/
static struct dma_async_tx_descriptor *
atc_prep_dma_interleaved(struct dma_chan *chan,
struct dma_interleaved_template *xt,
unsigned long flags)
{
struct at_dma *atdma = to_at_dma(chan->device);
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct data_chunk *first;
struct atdma_sg *atdma_sg;
struct at_desc *desc;
struct at_lli *lli;
size_t xfer_count;
unsigned int dwidth;
u32 ctrla;
u32 ctrlb;
size_t len = 0;
int i;
if (unlikely(!xt || xt->numf != 1 || !xt->frame_size))
return NULL;
first = xt->sgl;
dev_info(chan2dev(chan),
"%s: src=%pad, dest=%pad, numf=%d, frame_size=%d, flags=0x%lx\n",
__func__, &xt->src_start, &xt->dst_start, xt->numf,
xt->frame_size, flags);
/*
* The controller can only "skip" X bytes every Y bytes, so we
* need to make sure we are given a template that fit that
* description, ie a template with chunks that always have the
* same size, with the same ICGs.
*/
for (i = 0; i < xt->frame_size; i++) {
struct data_chunk *chunk = xt->sgl + i;
if ((chunk->size != xt->sgl->size) ||
(dmaengine_get_dst_icg(xt, chunk) != dmaengine_get_dst_icg(xt, first)) ||
(dmaengine_get_src_icg(xt, chunk) != dmaengine_get_src_icg(xt, first))) {
dev_err(chan2dev(chan),
"%s: the controller can transfer only identical chunks\n",
__func__);
return NULL;
}
len += chunk->size;
}
dwidth = atc_get_xfer_width(xt->src_start, xt->dst_start, len);
xfer_count = len >> dwidth;
if (xfer_count > ATC_BTSIZE_MAX) {
dev_err(chan2dev(chan), "%s: buffer is too big\n", __func__);
return NULL;
}
ctrla = FIELD_PREP(ATC_SRC_WIDTH, dwidth) |
FIELD_PREP(ATC_DST_WIDTH, dwidth);
ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN |
FIELD_PREP(ATC_SRC_ADDR_MODE, ATC_SRC_ADDR_MODE_INCR) |
FIELD_PREP(ATC_DST_ADDR_MODE, ATC_DST_ADDR_MODE_INCR) |
ATC_SRC_PIP | ATC_DST_PIP |
FIELD_PREP(ATC_FC, ATC_FC_MEM2MEM);
desc = kzalloc(struct_size(desc, sg, 1), GFP_ATOMIC);
if (!desc)
return NULL;
desc->sglen = 1;
atdma_sg = desc->sg;
atdma_sg->lli = dma_pool_alloc(atdma->lli_pool, GFP_NOWAIT,
&atdma_sg->lli_phys);
if (!atdma_sg->lli) {
kfree(desc);
return NULL;
}
lli = atdma_sg->lli;
lli->saddr = xt->src_start;
lli->daddr = xt->dst_start;
lli->ctrla = ctrla | xfer_count;
lli->ctrlb = ctrlb;
desc->boundary = first->size >> dwidth;
desc->dst_hole = (dmaengine_get_dst_icg(xt, first) >> dwidth) + 1;
desc->src_hole = (dmaengine_get_src_icg(xt, first) >> dwidth) + 1;
atdma_sg->len = len;
desc->total_len = len;
set_lli_eol(desc, 0);
return vchan_tx_prep(&atchan->vc, &desc->vd, flags);
}
/**
* atc_prep_dma_memcpy - prepare a memcpy operation
* @chan: the channel to prepare operation on
* @dest: operation virtual destination address
* @src: operation virtual source address
* @len: operation length
* @flags: tx descriptor status flags
*/
static struct dma_async_tx_descriptor *
atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct at_dma *atdma = to_at_dma(chan->device);
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_desc *desc = NULL;
size_t xfer_count;
size_t offset;
size_t sg_len;
unsigned int src_width;
unsigned int dst_width;
unsigned int i;
u32 ctrla;
u32 ctrlb;
dev_dbg(chan2dev(chan), "prep_dma_memcpy: d%pad s%pad l0x%zx f0x%lx\n",
&dest, &src, len, flags);
if (unlikely(!len)) {
dev_err(chan2dev(chan), "prep_dma_memcpy: length is zero!\n");
return NULL;
}
sg_len = DIV_ROUND_UP(len, ATC_BTSIZE_MAX);
desc = kzalloc(struct_size(desc, sg, sg_len), GFP_ATOMIC);
if (!desc)
return NULL;
desc->sglen = sg_len;
ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN |
FIELD_PREP(ATC_SRC_ADDR_MODE, ATC_SRC_ADDR_MODE_INCR) |
FIELD_PREP(ATC_DST_ADDR_MODE, ATC_DST_ADDR_MODE_INCR) |
FIELD_PREP(ATC_FC, ATC_FC_MEM2MEM);
/*
* We can be a lot more clever here, but this should take care
* of the most common optimization.
*/
src_width = dst_width = atc_get_xfer_width(src, dest, len);
ctrla = FIELD_PREP(ATC_SRC_WIDTH, src_width) |
FIELD_PREP(ATC_DST_WIDTH, dst_width);
for (offset = 0, i = 0; offset < len;
offset += xfer_count << src_width, i++) {
struct atdma_sg *atdma_sg = &desc->sg[i];
struct at_lli *lli;
atdma_sg->lli = dma_pool_alloc(atdma->lli_pool, GFP_NOWAIT,
&atdma_sg->lli_phys);
if (!atdma_sg->lli)
goto err_desc_get;
lli = atdma_sg->lli;
xfer_count = min_t(size_t, (len - offset) >> src_width,
ATC_BTSIZE_MAX);
lli->saddr = src + offset;
lli->daddr = dest + offset;
lli->ctrla = ctrla | xfer_count;
lli->ctrlb = ctrlb;
desc->sg[i].len = xfer_count << src_width;
atdma_lli_chain(desc, i);
}
desc->total_len = len;
/* set end-of-link to the last link descriptor of list*/
set_lli_eol(desc, i - 1);
return vchan_tx_prep(&atchan->vc, &desc->vd, flags);
err_desc_get:
atdma_desc_free(&desc->vd);
return NULL;
}
static int atdma_create_memset_lli(struct dma_chan *chan,
struct atdma_sg *atdma_sg,
dma_addr_t psrc, dma_addr_t pdst, size_t len)
{
struct at_dma *atdma = to_at_dma(chan->device);
struct at_lli *lli;
size_t xfer_count;
u32 ctrla = FIELD_PREP(ATC_SRC_WIDTH, 2) | FIELD_PREP(ATC_DST_WIDTH, 2);
u32 ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN |
FIELD_PREP(ATC_SRC_ADDR_MODE, ATC_SRC_ADDR_MODE_FIXED) |
FIELD_PREP(ATC_DST_ADDR_MODE, ATC_DST_ADDR_MODE_INCR) |
FIELD_PREP(ATC_FC, ATC_FC_MEM2MEM);
xfer_count = len >> 2;
if (xfer_count > ATC_BTSIZE_MAX) {
dev_err(chan2dev(chan), "%s: buffer is too big\n", __func__);
return -EINVAL;
}
atdma_sg->lli = dma_pool_alloc(atdma->lli_pool, GFP_NOWAIT,
&atdma_sg->lli_phys);
if (!atdma_sg->lli)
return -ENOMEM;
lli = atdma_sg->lli;
lli->saddr = psrc;
lli->daddr = pdst;
lli->ctrla = ctrla | xfer_count;
lli->ctrlb = ctrlb;
atdma_sg->len = len;
return 0;
}
/**
* atc_prep_dma_memset - prepare a memcpy operation
* @chan: the channel to prepare operation on
* @dest: operation virtual destination address
* @value: value to set memory buffer to
* @len: operation length
* @flags: tx descriptor status flags
*/
static struct dma_async_tx_descriptor *
atc_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
size_t len, unsigned long flags)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma *atdma = to_at_dma(chan->device);
struct at_desc *desc;
void __iomem *vaddr;
dma_addr_t paddr;
char fill_pattern;
int ret;
dev_vdbg(chan2dev(chan), "%s: d%pad v0x%x l0x%zx f0x%lx\n", __func__,
&dest, value, len, flags);
if (unlikely(!len)) {
dev_dbg(chan2dev(chan), "%s: length is zero!\n", __func__);
return NULL;
}
if (!is_dma_fill_aligned(chan->device, dest, 0, len)) {
dev_dbg(chan2dev(chan), "%s: buffer is not aligned\n",
__func__);
return NULL;
}
vaddr = dma_pool_alloc(atdma->memset_pool, GFP_NOWAIT, &paddr);
if (!vaddr) {
dev_err(chan2dev(chan), "%s: couldn't allocate buffer\n",
__func__);
return NULL;
}
/* Only the first byte of value is to be used according to dmaengine */
fill_pattern = (char)value;
*(u32*)vaddr = (fill_pattern << 24) |
(fill_pattern << 16) |
(fill_pattern << 8) |
fill_pattern;
desc = kzalloc(struct_size(desc, sg, 1), GFP_ATOMIC);
if (!desc)
goto err_free_buffer;
desc->sglen = 1;
ret = atdma_create_memset_lli(chan, desc->sg, paddr, dest, len);
if (ret)
goto err_free_desc;
desc->memset_paddr = paddr;
desc->memset_vaddr = vaddr;
desc->memset_buffer = true;
desc->total_len = len;
/* set end-of-link on the descriptor */
set_lli_eol(desc, 0);
return vchan_tx_prep(&atchan->vc, &desc->vd, flags);
err_free_desc:
kfree(desc);
err_free_buffer:
dma_pool_free(atdma->memset_pool, vaddr, paddr);
return NULL;
}
static struct dma_async_tx_descriptor *
atc_prep_dma_memset_sg(struct dma_chan *chan,
struct scatterlist *sgl,
unsigned int sg_len, int value,
unsigned long flags)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma *atdma = to_at_dma(chan->device);
struct at_desc *desc;
struct scatterlist *sg;
void __iomem *vaddr;
dma_addr_t paddr;
size_t total_len = 0;
int i;
int ret;
dev_vdbg(chan2dev(chan), "%s: v0x%x l0x%zx f0x%lx\n", __func__,
value, sg_len, flags);
if (unlikely(!sgl || !sg_len)) {
dev_dbg(chan2dev(chan), "%s: scatterlist is empty!\n",
__func__);
return NULL;
}
vaddr = dma_pool_alloc(atdma->memset_pool, GFP_NOWAIT, &paddr);
if (!vaddr) {
dev_err(chan2dev(chan), "%s: couldn't allocate buffer\n",
__func__);
return NULL;
}
*(u32*)vaddr = value;
desc = kzalloc(struct_size(desc, sg, sg_len), GFP_ATOMIC);
if (!desc)
goto err_free_dma_buf;
desc->sglen = sg_len;
for_each_sg(sgl, sg, sg_len, i) {
dma_addr_t dest = sg_dma_address(sg);
size_t len = sg_dma_len(sg);
dev_vdbg(chan2dev(chan), "%s: d%pad, l0x%zx\n",
__func__, &dest, len);
if (!is_dma_fill_aligned(chan->device, dest, 0, len)) {
dev_err(chan2dev(chan), "%s: buffer is not aligned\n",
__func__);
goto err_free_desc;
}
ret = atdma_create_memset_lli(chan, &desc->sg[i], paddr, dest,
len);
if (ret)
goto err_free_desc;
atdma_lli_chain(desc, i);
total_len += len;
}
desc->memset_paddr = paddr;
desc->memset_vaddr = vaddr;
desc->memset_buffer = true;
desc->total_len = total_len;
/* set end-of-link on the descriptor */
set_lli_eol(desc, i - 1);
return vchan_tx_prep(&atchan->vc, &desc->vd, flags);
err_free_desc:
atdma_desc_free(&desc->vd);
err_free_dma_buf:
dma_pool_free(atdma->memset_pool, vaddr, paddr);
return NULL;
}
/**
* atc_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
* @chan: DMA channel
* @sgl: scatterlist to transfer to/from
* @sg_len: number of entries in @scatterlist
* @direction: DMA direction
* @flags: tx descriptor status flags
* @context: transaction context (ignored)
*/
static struct dma_async_tx_descriptor *
atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct at_dma *atdma = to_at_dma(chan->device);
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma_slave *atslave = chan->private;
struct dma_slave_config *sconfig = &atchan->dma_sconfig;
struct at_desc *desc;
u32 ctrla;
u32 ctrlb;
dma_addr_t reg;
unsigned int reg_width;
unsigned int mem_width;
unsigned int i;
struct scatterlist *sg;
size_t total_len = 0;
dev_vdbg(chan2dev(chan), "prep_slave_sg (%d): %s f0x%lx\n",
sg_len,
direction == DMA_MEM_TO_DEV ? "TO DEVICE" : "FROM DEVICE",
flags);
if (unlikely(!atslave || !sg_len)) {
dev_dbg(chan2dev(chan), "prep_slave_sg: sg length is zero!\n");
return NULL;
}
desc = kzalloc(struct_size(desc, sg, sg_len), GFP_ATOMIC);
if (!desc)
return NULL;
desc->sglen = sg_len;
ctrla = FIELD_PREP(ATC_SCSIZE, sconfig->src_maxburst) |
FIELD_PREP(ATC_DCSIZE, sconfig->dst_maxburst);
ctrlb = ATC_IEN;
switch (direction) {
case DMA_MEM_TO_DEV:
reg_width = convert_buswidth(sconfig->dst_addr_width);
ctrla |= FIELD_PREP(ATC_DST_WIDTH, reg_width);
ctrlb |= FIELD_PREP(ATC_DST_ADDR_MODE,
ATC_DST_ADDR_MODE_FIXED) |
FIELD_PREP(ATC_SRC_ADDR_MODE, ATC_SRC_ADDR_MODE_INCR) |
FIELD_PREP(ATC_FC, ATC_FC_MEM2PER) |
FIELD_PREP(ATC_SIF, atchan->mem_if) |
FIELD_PREP(ATC_DIF, atchan->per_if);
reg = sconfig->dst_addr;
for_each_sg(sgl, sg, sg_len, i) {
struct atdma_sg *atdma_sg = &desc->sg[i];
struct at_lli *lli;
u32 len;
u32 mem;
atdma_sg->lli = dma_pool_alloc(atdma->lli_pool,
GFP_NOWAIT,
&atdma_sg->lli_phys);
if (!atdma_sg->lli)
goto err_desc_get;
lli = atdma_sg->lli;
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
if (unlikely(!len)) {
dev_dbg(chan2dev(chan),
"prep_slave_sg: sg(%d) data length is zero\n", i);
goto err;
}
mem_width = 2;
if (unlikely(mem & 3 || len & 3))
mem_width = 0;
lli->saddr = mem;
lli->daddr = reg;
lli->ctrla = ctrla |
FIELD_PREP(ATC_SRC_WIDTH, mem_width) |
len >> mem_width;
lli->ctrlb = ctrlb;
atdma_sg->len = len;
total_len += len;
desc->sg[i].len = len;
atdma_lli_chain(desc, i);
}
break;
case DMA_DEV_TO_MEM:
reg_width = convert_buswidth(sconfig->src_addr_width);
ctrla |= FIELD_PREP(ATC_SRC_WIDTH, reg_width);
ctrlb |= FIELD_PREP(ATC_DST_ADDR_MODE, ATC_DST_ADDR_MODE_INCR) |
FIELD_PREP(ATC_SRC_ADDR_MODE,
ATC_SRC_ADDR_MODE_FIXED) |
FIELD_PREP(ATC_FC, ATC_FC_PER2MEM) |
FIELD_PREP(ATC_SIF, atchan->per_if) |
FIELD_PREP(ATC_DIF, atchan->mem_if);
reg = sconfig->src_addr;
for_each_sg(sgl, sg, sg_len, i) {
struct atdma_sg *atdma_sg = &desc->sg[i];
struct at_lli *lli;
u32 len;
u32 mem;
atdma_sg->lli = dma_pool_alloc(atdma->lli_pool,
GFP_NOWAIT,
&atdma_sg->lli_phys);
if (!atdma_sg->lli)
goto err_desc_get;
lli = atdma_sg->lli;
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
if (unlikely(!len)) {
dev_dbg(chan2dev(chan),
"prep_slave_sg: sg(%d) data length is zero\n", i);
goto err;
}
mem_width = 2;
if (unlikely(mem & 3 || len & 3))
mem_width = 0;
lli->saddr = reg;
lli->daddr = mem;
lli->ctrla = ctrla |
FIELD_PREP(ATC_DST_WIDTH, mem_width) |
len >> reg_width;
lli->ctrlb = ctrlb;
desc->sg[i].len = len;
total_len += len;
atdma_lli_chain(desc, i);
}
break;
default:
return NULL;
}
/* set end-of-link to the last link descriptor of list*/
set_lli_eol(desc, i - 1);
desc->total_len = total_len;
return vchan_tx_prep(&atchan->vc, &desc->vd, flags);
err_desc_get:
dev_err(chan2dev(chan), "not enough descriptors available\n");
err:
atdma_desc_free(&desc->vd);
return NULL;
}
/*
* atc_dma_cyclic_check_values
* Check for too big/unaligned periods and unaligned DMA buffer
*/
static int
atc_dma_cyclic_check_values(unsigned int reg_width, dma_addr_t buf_addr,
size_t period_len)
{
if (period_len > (ATC_BTSIZE_MAX << reg_width))
goto err_out;
if (unlikely(period_len & ((1 << reg_width) - 1)))
goto err_out;
if (unlikely(buf_addr & ((1 << reg_width) - 1)))
goto err_out;
return 0;
err_out:
return -EINVAL;
}
/*
* atc_dma_cyclic_fill_desc - Fill one period descriptor
*/
static int
atc_dma_cyclic_fill_desc(struct dma_chan *chan, struct at_desc *desc,
unsigned int i, dma_addr_t buf_addr,
unsigned int reg_width, size_t period_len,
enum dma_transfer_direction direction)
{
struct at_dma *atdma = to_at_dma(chan->device);
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct dma_slave_config *sconfig = &atchan->dma_sconfig;
struct atdma_sg *atdma_sg = &desc->sg[i];
struct at_lli *lli;
atdma_sg->lli = dma_pool_alloc(atdma->lli_pool, GFP_ATOMIC,
&atdma_sg->lli_phys);
if (!atdma_sg->lli)
return -ENOMEM;
lli = atdma_sg->lli;
switch (direction) {
case DMA_MEM_TO_DEV:
lli->saddr = buf_addr + (period_len * i);
lli->daddr = sconfig->dst_addr;
lli->ctrlb = FIELD_PREP(ATC_DST_ADDR_MODE,
ATC_DST_ADDR_MODE_FIXED) |
FIELD_PREP(ATC_SRC_ADDR_MODE,
ATC_SRC_ADDR_MODE_INCR) |
FIELD_PREP(ATC_FC, ATC_FC_MEM2PER) |
FIELD_PREP(ATC_SIF, atchan->mem_if) |
FIELD_PREP(ATC_DIF, atchan->per_if);
break;
case DMA_DEV_TO_MEM:
lli->saddr = sconfig->src_addr;
lli->daddr = buf_addr + (period_len * i);
lli->ctrlb = FIELD_PREP(ATC_DST_ADDR_MODE,
ATC_DST_ADDR_MODE_INCR) |
FIELD_PREP(ATC_SRC_ADDR_MODE,
ATC_SRC_ADDR_MODE_FIXED) |
FIELD_PREP(ATC_FC, ATC_FC_PER2MEM) |
FIELD_PREP(ATC_SIF, atchan->per_if) |
FIELD_PREP(ATC_DIF, atchan->mem_if);
break;
default:
return -EINVAL;
}
lli->ctrla = FIELD_PREP(ATC_SCSIZE, sconfig->src_maxburst) |
FIELD_PREP(ATC_DCSIZE, sconfig->dst_maxburst) |
FIELD_PREP(ATC_DST_WIDTH, reg_width) |
FIELD_PREP(ATC_SRC_WIDTH, reg_width) |
period_len >> reg_width;
desc->sg[i].len = period_len;
return 0;
}
/**
* atc_prep_dma_cyclic - prepare the cyclic DMA transfer
* @chan: the DMA channel to prepare
* @buf_addr: physical DMA address where the buffer starts
* @buf_len: total number of bytes for the entire buffer
* @period_len: number of bytes for each period
* @direction: transfer direction, to or from device
* @flags: tx descriptor status flags
*/
static struct dma_async_tx_descriptor *
atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma_slave *atslave = chan->private;
struct dma_slave_config *sconfig = &atchan->dma_sconfig;
struct at_desc *desc;
unsigned long was_cyclic;
unsigned int reg_width;
unsigned int periods = buf_len / period_len;
unsigned int i;
dev_vdbg(chan2dev(chan), "prep_dma_cyclic: %s buf@%pad - %d (%d/%d)\n",
direction == DMA_MEM_TO_DEV ? "TO DEVICE" : "FROM DEVICE",
&buf_addr,
periods, buf_len, period_len);
if (unlikely(!atslave || !buf_len || !period_len)) {
dev_dbg(chan2dev(chan), "prep_dma_cyclic: length is zero!\n");
return NULL;
}
was_cyclic = test_and_set_bit(ATC_IS_CYCLIC, &atchan->status);
if (was_cyclic) {
dev_dbg(chan2dev(chan), "prep_dma_cyclic: channel in use!\n");
return NULL;
}
if (unlikely(!is_slave_direction(direction)))
goto err_out;
if (direction == DMA_MEM_TO_DEV)
reg_width = convert_buswidth(sconfig->dst_addr_width);
else
reg_width = convert_buswidth(sconfig->src_addr_width);
/* Check for too big/unaligned periods and unaligned DMA buffer */
if (atc_dma_cyclic_check_values(reg_width, buf_addr, period_len))
goto err_out;
desc = kzalloc(struct_size(desc, sg, periods), GFP_ATOMIC);
if (!desc)
goto err_out;
desc->sglen = periods;
/* build cyclic linked list */
for (i = 0; i < periods; i++) {
if (atc_dma_cyclic_fill_desc(chan, desc, i, buf_addr,
reg_width, period_len, direction))
goto err_fill_desc;
atdma_lli_chain(desc, i);
}
desc->total_len = buf_len;
/* lets make a cyclic list */
desc->sg[i - 1].lli->dscr = desc->sg[0].lli_phys;
return vchan_tx_prep(&atchan->vc, &desc->vd, flags);
err_fill_desc:
atdma_desc_free(&desc->vd);
err_out:
clear_bit(ATC_IS_CYCLIC, &atchan->status);
return NULL;
}
static int atc_config(struct dma_chan *chan,
struct dma_slave_config *sconfig)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
dev_vdbg(chan2dev(chan), "%s\n", __func__);
/* Check if it is chan is configured for slave transfers */
if (!chan->private)
return -EINVAL;
memcpy(&atchan->dma_sconfig, sconfig, sizeof(*sconfig));
convert_burst(&atchan->dma_sconfig.src_maxburst);
convert_burst(&atchan->dma_sconfig.dst_maxburst);
return 0;
}
static int atc_pause(struct dma_chan *chan)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma *atdma = to_at_dma(chan->device);
int chan_id = atchan->vc.chan.chan_id;
unsigned long flags;
dev_vdbg(chan2dev(chan), "%s\n", __func__);
spin_lock_irqsave(&atchan->vc.lock, flags);
dma_writel(atdma, CHER, AT_DMA_SUSP(chan_id));
set_bit(ATC_IS_PAUSED, &atchan->status);
spin_unlock_irqrestore(&atchan->vc.lock, flags);
return 0;
}
static int atc_resume(struct dma_chan *chan)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma *atdma = to_at_dma(chan->device);
int chan_id = atchan->vc.chan.chan_id;
unsigned long flags;
dev_vdbg(chan2dev(chan), "%s\n", __func__);
if (!atc_chan_is_paused(atchan))
return 0;
spin_lock_irqsave(&atchan->vc.lock, flags);
dma_writel(atdma, CHDR, AT_DMA_RES(chan_id));
clear_bit(ATC_IS_PAUSED, &atchan->status);
spin_unlock_irqrestore(&atchan->vc.lock, flags);
return 0;
}
static int atc_terminate_all(struct dma_chan *chan)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma *atdma = to_at_dma(chan->device);
int chan_id = atchan->vc.chan.chan_id;
unsigned long flags;
LIST_HEAD(list);
dev_vdbg(chan2dev(chan), "%s\n", __func__);
/*
* This is only called when something went wrong elsewhere, so
* we don't really care about the data. Just disable the
* channel. We still have to poll the channel enable bit due
* to AHB/HSB limitations.
*/
spin_lock_irqsave(&atchan->vc.lock, flags);
/* disabling channel: must also remove suspend state */
dma_writel(atdma, CHDR, AT_DMA_RES(chan_id) | atchan->mask);
/* confirm that this channel is disabled */
while (dma_readl(atdma, CHSR) & atchan->mask)
cpu_relax();
if (atchan->desc) {
vchan_terminate_vdesc(&atchan->desc->vd);
atchan->desc = NULL;
}
vchan_get_all_descriptors(&atchan->vc, &list);
clear_bit(ATC_IS_PAUSED, &atchan->status);
/* if channel dedicated to cyclic operations, free it */
clear_bit(ATC_IS_CYCLIC, &atchan->status);
spin_unlock_irqrestore(&atchan->vc.lock, flags);
vchan_dma_desc_free_list(&atchan->vc, &list);
return 0;
}
/**
* atc_tx_status - poll for transaction completion
* @chan: DMA channel
* @cookie: transaction identifier to check status of
* @txstate: if not %NULL updated with transaction state
*
* If @txstate is passed in, upon return it reflect the driver
* internal state and can be used with dma_async_is_complete() to check
* the status of multiple cookies without re-checking hardware state.
*/
static enum dma_status
atc_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
unsigned long flags;
enum dma_status dma_status;
u32 residue;
int ret;
dma_status = dma_cookie_status(chan, cookie, txstate);
if (dma_status == DMA_COMPLETE || !txstate)
return dma_status;
spin_lock_irqsave(&atchan->vc.lock, flags);
/* Get number of bytes left in the active transactions */
ret = atc_get_residue(chan, cookie, &residue);
spin_unlock_irqrestore(&atchan->vc.lock, flags);
if (unlikely(ret < 0)) {
dev_vdbg(chan2dev(chan), "get residual bytes error\n");
return DMA_ERROR;
} else {
dma_set_residue(txstate, residue);
}
dev_vdbg(chan2dev(chan), "tx_status %d: cookie = %d residue = %u\n",
dma_status, cookie, residue);
return dma_status;
}
static void atc_issue_pending(struct dma_chan *chan)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&atchan->vc.lock, flags);
if (vchan_issue_pending(&atchan->vc) && !atchan->desc) {
if (!(atc_chan_is_enabled(atchan)))
atc_dostart(atchan);
}
spin_unlock_irqrestore(&atchan->vc.lock, flags);
}
/**
* atc_alloc_chan_resources - allocate resources for DMA channel
* @chan: allocate descriptor resources for this channel
*
* return - the number of allocated descriptors
*/
static int atc_alloc_chan_resources(struct dma_chan *chan)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma *atdma = to_at_dma(chan->device);
struct at_dma_slave *atslave;
u32 cfg;
dev_vdbg(chan2dev(chan), "alloc_chan_resources\n");
/* ASSERT: channel is idle */
if (atc_chan_is_enabled(atchan)) {
dev_dbg(chan2dev(chan), "DMA channel not idle ?\n");
return -EIO;
}
cfg = ATC_DEFAULT_CFG;
atslave = chan->private;
if (atslave) {
/*
* We need controller-specific data to set up slave
* transfers.
*/
BUG_ON(!atslave->dma_dev || atslave->dma_dev != atdma->dma_device.dev);
/* if cfg configuration specified take it instead of default */
if (atslave->cfg)
cfg = atslave->cfg;
}
/* channel parameters */
channel_writel(atchan, CFG, cfg);
return 0;
}
/**
* atc_free_chan_resources - free all channel resources
* @chan: DMA channel
*/
static void atc_free_chan_resources(struct dma_chan *chan)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
BUG_ON(atc_chan_is_enabled(atchan));
vchan_free_chan_resources(to_virt_chan(chan));
atchan->status = 0;
/*
* Free atslave allocated in at_dma_xlate()
*/
kfree(chan->private);
chan->private = NULL;
dev_vdbg(chan2dev(chan), "free_chan_resources: done\n");
}
#ifdef CONFIG_OF
static bool at_dma_filter(struct dma_chan *chan, void *slave)
{
struct at_dma_slave *atslave = slave;
if (atslave->dma_dev == chan->device->dev) {
chan->private = atslave;
return true;
} else {
return false;
}
}
static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *of_dma)
{
struct dma_chan *chan;
struct at_dma_chan *atchan;
struct at_dma_slave *atslave;
dma_cap_mask_t mask;
unsigned int per_id;
struct platform_device *dmac_pdev;
if (dma_spec->args_count != 2)
return NULL;
dmac_pdev = of_find_device_by_node(dma_spec->np);
if (!dmac_pdev)
return NULL;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
atslave = kmalloc(sizeof(*atslave), GFP_KERNEL);
if (!atslave) {
put_device(&dmac_pdev->dev);
return NULL;
}
atslave->cfg = ATC_DST_H2SEL | ATC_SRC_H2SEL;
/*
* We can fill both SRC_PER and DST_PER, one of these fields will be
* ignored depending on DMA transfer direction.
*/
per_id = dma_spec->args[1] & AT91_DMA_CFG_PER_ID_MASK;
atslave->cfg |= ATC_DST_PER_ID(per_id) | ATC_SRC_PER_ID(per_id);
/*
* We have to translate the value we get from the device tree since
* the half FIFO configuration value had to be 0 to keep backward
* compatibility.
*/
switch (dma_spec->args[1] & AT91_DMA_CFG_FIFOCFG_MASK) {
case AT91_DMA_CFG_FIFOCFG_ALAP:
atslave->cfg |= FIELD_PREP(ATC_FIFOCFG,
ATC_FIFOCFG_LARGESTBURST);
break;
case AT91_DMA_CFG_FIFOCFG_ASAP:
atslave->cfg |= FIELD_PREP(ATC_FIFOCFG,
ATC_FIFOCFG_ENOUGHSPACE);
break;
case AT91_DMA_CFG_FIFOCFG_HALF:
default:
atslave->cfg |= FIELD_PREP(ATC_FIFOCFG, ATC_FIFOCFG_HALFFIFO);
}
atslave->dma_dev = &dmac_pdev->dev;
chan = dma_request_channel(mask, at_dma_filter, atslave);
if (!chan) {
put_device(&dmac_pdev->dev);
kfree(atslave);
return NULL;
}
atchan = to_at_dma_chan(chan);
atchan->per_if = dma_spec->args[0] & 0xff;
atchan->mem_if = (dma_spec->args[0] >> 16) & 0xff;
return chan;
}
#else
static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *of_dma)
{
return NULL;
}
#endif
/*-- Module Management -----------------------------------------------*/
/* cap_mask is a multi-u32 bitfield, fill it with proper C code. */
static struct at_dma_platform_data at91sam9rl_config = {
.nr_channels = 2,
};
static struct at_dma_platform_data at91sam9g45_config = {
.nr_channels = 8,
};
#if defined(CONFIG_OF)
static const struct of_device_id atmel_dma_dt_ids[] = {
{
.compatible = "atmel,at91sam9rl-dma",
.data = &at91sam9rl_config,
}, {
.compatible = "atmel,at91sam9g45-dma",
.data = &at91sam9g45_config,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, atmel_dma_dt_ids);
#endif
static const struct platform_device_id atdma_devtypes[] = {
{
.name = "at91sam9rl_dma",
.driver_data = (unsigned long) &at91sam9rl_config,
}, {
.name = "at91sam9g45_dma",
.driver_data = (unsigned long) &at91sam9g45_config,
}, {
/* sentinel */
}
};
static inline const struct at_dma_platform_data * __init at_dma_get_driver_data(
struct platform_device *pdev)
{
if (pdev->dev.of_node) {
const struct of_device_id *match;
match = of_match_node(atmel_dma_dt_ids, pdev->dev.of_node);
if (match == NULL)
return NULL;
return match->data;
}
return (struct at_dma_platform_data *)
platform_get_device_id(pdev)->driver_data;
}
/**
* at_dma_off - disable DMA controller
* @atdma: the Atmel HDAMC device
*/
static void at_dma_off(struct at_dma *atdma)
{
dma_writel(atdma, EN, 0);
/* disable all interrupts */
dma_writel(atdma, EBCIDR, -1L);
/* confirm that all channels are disabled */
while (dma_readl(atdma, CHSR) & atdma->all_chan_mask)
cpu_relax();
}
static int __init at_dma_probe(struct platform_device *pdev)
{
struct at_dma *atdma;
int irq;
int err;
int i;
const struct at_dma_platform_data *plat_dat;
/* setup platform data for each SoC */
dma_cap_set(DMA_MEMCPY, at91sam9rl_config.cap_mask);
dma_cap_set(DMA_INTERLEAVE, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_MEMCPY, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_MEMSET, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_MEMSET_SG, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_PRIVATE, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_SLAVE, at91sam9g45_config.cap_mask);
/* get DMA parameters from controller type */
plat_dat = at_dma_get_driver_data(pdev);
if (!plat_dat)
return -ENODEV;
atdma = devm_kzalloc(&pdev->dev,
struct_size(atdma, chan, plat_dat->nr_channels),
GFP_KERNEL);
if (!atdma)
return -ENOMEM;
atdma->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(atdma->regs))
return PTR_ERR(atdma->regs);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
/* discover transaction capabilities */
atdma->dma_device.cap_mask = plat_dat->cap_mask;
atdma->all_chan_mask = (1 << plat_dat->nr_channels) - 1;
atdma->clk = devm_clk_get(&pdev->dev, "dma_clk");
if (IS_ERR(atdma->clk))
return PTR_ERR(atdma->clk);
err = clk_prepare_enable(atdma->clk);
if (err)
return err;
/* force dma off, just in case */
at_dma_off(atdma);
err = request_irq(irq, at_dma_interrupt, 0, "at_hdmac", atdma);
if (err)
goto err_irq;
platform_set_drvdata(pdev, atdma);
/* create a pool of consistent memory blocks for hardware descriptors */
atdma->lli_pool = dma_pool_create("at_hdmac_lli_pool",
&pdev->dev, sizeof(struct at_lli),
4 /* word alignment */, 0);
if (!atdma->lli_pool) {
dev_err(&pdev->dev, "Unable to allocate DMA LLI descriptor pool\n");
err = -ENOMEM;
goto err_desc_pool_create;
}
/* create a pool of consistent memory blocks for memset blocks */
atdma->memset_pool = dma_pool_create("at_hdmac_memset_pool",
&pdev->dev, sizeof(int), 4, 0);
if (!atdma->memset_pool) {
dev_err(&pdev->dev, "No memory for memset dma pool\n");
err = -ENOMEM;
goto err_memset_pool_create;
}
/* clear any pending interrupt */
while (dma_readl(atdma, EBCISR))
cpu_relax();
/* initialize channels related values */
INIT_LIST_HEAD(&atdma->dma_device.channels);
for (i = 0; i < plat_dat->nr_channels; i++) {
struct at_dma_chan *atchan = &atdma->chan[i];
atchan->mem_if = AT_DMA_MEM_IF;
atchan->per_if = AT_DMA_PER_IF;
atchan->ch_regs = atdma->regs + ch_regs(i);
atchan->mask = 1 << i;
atchan->atdma = atdma;
atchan->vc.desc_free = atdma_desc_free;
vchan_init(&atchan->vc, &atdma->dma_device);
atc_enable_chan_irq(atdma, i);
}
/* set base routines */
atdma->dma_device.device_alloc_chan_resources = atc_alloc_chan_resources;
atdma->dma_device.device_free_chan_resources = atc_free_chan_resources;
atdma->dma_device.device_tx_status = atc_tx_status;
atdma->dma_device.device_issue_pending = atc_issue_pending;
atdma->dma_device.dev = &pdev->dev;
/* set prep routines based on capability */
if (dma_has_cap(DMA_INTERLEAVE, atdma->dma_device.cap_mask))
atdma->dma_device.device_prep_interleaved_dma = atc_prep_dma_interleaved;
if (dma_has_cap(DMA_MEMCPY, atdma->dma_device.cap_mask))
atdma->dma_device.device_prep_dma_memcpy = atc_prep_dma_memcpy;
if (dma_has_cap(DMA_MEMSET, atdma->dma_device.cap_mask)) {
atdma->dma_device.device_prep_dma_memset = atc_prep_dma_memset;
atdma->dma_device.device_prep_dma_memset_sg = atc_prep_dma_memset_sg;
atdma->dma_device.fill_align = DMAENGINE_ALIGN_4_BYTES;
}
if (dma_has_cap(DMA_SLAVE, atdma->dma_device.cap_mask)) {
atdma->dma_device.device_prep_slave_sg = atc_prep_slave_sg;
/* controller can do slave DMA: can trigger cyclic transfers */
dma_cap_set(DMA_CYCLIC, atdma->dma_device.cap_mask);
atdma->dma_device.device_prep_dma_cyclic = atc_prep_dma_cyclic;
atdma->dma_device.device_config = atc_config;
atdma->dma_device.device_pause = atc_pause;
atdma->dma_device.device_resume = atc_resume;
atdma->dma_device.device_terminate_all = atc_terminate_all;
atdma->dma_device.src_addr_widths = ATC_DMA_BUSWIDTHS;
atdma->dma_device.dst_addr_widths = ATC_DMA_BUSWIDTHS;
atdma->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
atdma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
}
dma_writel(atdma, EN, AT_DMA_ENABLE);
dev_info(&pdev->dev, "Atmel AHB DMA Controller ( %s%s%s), %d channels\n",
dma_has_cap(DMA_MEMCPY, atdma->dma_device.cap_mask) ? "cpy " : "",
dma_has_cap(DMA_MEMSET, atdma->dma_device.cap_mask) ? "set " : "",
dma_has_cap(DMA_SLAVE, atdma->dma_device.cap_mask) ? "slave " : "",
plat_dat->nr_channels);
err = dma_async_device_register(&atdma->dma_device);
if (err) {
dev_err(&pdev->dev, "Unable to register: %d.\n", err);
goto err_dma_async_device_register;
}
/*
* Do not return an error if the dmac node is not present in order to
* not break the existing way of requesting channel with
* dma_request_channel().
*/
if (pdev->dev.of_node) {
err = of_dma_controller_register(pdev->dev.of_node,
at_dma_xlate, atdma);
if (err) {
dev_err(&pdev->dev, "could not register of_dma_controller\n");
goto err_of_dma_controller_register;
}
}
return 0;
err_of_dma_controller_register:
dma_async_device_unregister(&atdma->dma_device);
err_dma_async_device_register:
dma_pool_destroy(atdma->memset_pool);
err_memset_pool_create:
dma_pool_destroy(atdma->lli_pool);
err_desc_pool_create:
free_irq(platform_get_irq(pdev, 0), atdma);
err_irq:
clk_disable_unprepare(atdma->clk);
return err;
}
static int at_dma_remove(struct platform_device *pdev)
{
struct at_dma *atdma = platform_get_drvdata(pdev);
struct dma_chan *chan, *_chan;
at_dma_off(atdma);
if (pdev->dev.of_node)
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&atdma->dma_device);
dma_pool_destroy(atdma->memset_pool);
dma_pool_destroy(atdma->lli_pool);
free_irq(platform_get_irq(pdev, 0), atdma);
list_for_each_entry_safe(chan, _chan, &atdma->dma_device.channels,
device_node) {
/* Disable interrupts */
atc_disable_chan_irq(atdma, chan->chan_id);
list_del(&chan->device_node);
}
clk_disable_unprepare(atdma->clk);
return 0;
}
static void at_dma_shutdown(struct platform_device *pdev)
{
struct at_dma *atdma = platform_get_drvdata(pdev);
at_dma_off(platform_get_drvdata(pdev));
clk_disable_unprepare(atdma->clk);
}
static int at_dma_prepare(struct device *dev)
{
struct at_dma *atdma = dev_get_drvdata(dev);
struct dma_chan *chan, *_chan;
list_for_each_entry_safe(chan, _chan, &atdma->dma_device.channels,
device_node) {
struct at_dma_chan *atchan = to_at_dma_chan(chan);
/* wait for transaction completion (except in cyclic case) */
if (atc_chan_is_enabled(atchan) && !atc_chan_is_cyclic(atchan))
return -EAGAIN;
}
return 0;
}
static void atc_suspend_cyclic(struct at_dma_chan *atchan)
{
struct dma_chan *chan = &atchan->vc.chan;
/* Channel should be paused by user
* do it anyway even if it is not done already */
if (!atc_chan_is_paused(atchan)) {
dev_warn(chan2dev(chan),
"cyclic channel not paused, should be done by channel user\n");
atc_pause(chan);
}
/* now preserve additional data for cyclic operations */
/* next descriptor address in the cyclic list */
atchan->save_dscr = channel_readl(atchan, DSCR);
vdbg_dump_regs(atchan);
}
static int at_dma_suspend_noirq(struct device *dev)
{
struct at_dma *atdma = dev_get_drvdata(dev);
struct dma_chan *chan, *_chan;
/* preserve data */
list_for_each_entry_safe(chan, _chan, &atdma->dma_device.channels,
device_node) {
struct at_dma_chan *atchan = to_at_dma_chan(chan);
if (atc_chan_is_cyclic(atchan))
atc_suspend_cyclic(atchan);
atchan->save_cfg = channel_readl(atchan, CFG);
}
atdma->save_imr = dma_readl(atdma, EBCIMR);
/* disable DMA controller */
at_dma_off(atdma);
clk_disable_unprepare(atdma->clk);
return 0;
}
static void atc_resume_cyclic(struct at_dma_chan *atchan)
{
struct at_dma *atdma = to_at_dma(atchan->vc.chan.device);
/* restore channel status for cyclic descriptors list:
* next descriptor in the cyclic list at the time of suspend */
channel_writel(atchan, SADDR, 0);
channel_writel(atchan, DADDR, 0);
channel_writel(atchan, CTRLA, 0);
channel_writel(atchan, CTRLB, 0);
channel_writel(atchan, DSCR, atchan->save_dscr);
dma_writel(atdma, CHER, atchan->mask);
/* channel pause status should be removed by channel user
* We cannot take the initiative to do it here */
vdbg_dump_regs(atchan);
}
static int at_dma_resume_noirq(struct device *dev)
{
struct at_dma *atdma = dev_get_drvdata(dev);
struct dma_chan *chan, *_chan;
/* bring back DMA controller */
clk_prepare_enable(atdma->clk);
dma_writel(atdma, EN, AT_DMA_ENABLE);
/* clear any pending interrupt */
while (dma_readl(atdma, EBCISR))
cpu_relax();
/* restore saved data */
dma_writel(atdma, EBCIER, atdma->save_imr);
list_for_each_entry_safe(chan, _chan, &atdma->dma_device.channels,
device_node) {
struct at_dma_chan *atchan = to_at_dma_chan(chan);
channel_writel(atchan, CFG, atchan->save_cfg);
if (atc_chan_is_cyclic(atchan))
atc_resume_cyclic(atchan);
}
return 0;
}
static const struct dev_pm_ops __maybe_unused at_dma_dev_pm_ops = {
.prepare = at_dma_prepare,
.suspend_noirq = at_dma_suspend_noirq,
.resume_noirq = at_dma_resume_noirq,
};
static struct platform_driver at_dma_driver = {
.remove = at_dma_remove,
.shutdown = at_dma_shutdown,
.id_table = atdma_devtypes,
.driver = {
.name = "at_hdmac",
.pm = pm_ptr(&at_dma_dev_pm_ops),
.of_match_table = of_match_ptr(atmel_dma_dt_ids),
},
};
static int __init at_dma_init(void)
{
return platform_driver_probe(&at_dma_driver, at_dma_probe);
}
subsys_initcall(at_dma_init);
static void __exit at_dma_exit(void)
{
platform_driver_unregister(&at_dma_driver);
}
module_exit(at_dma_exit);
MODULE_DESCRIPTION("Atmel AHB DMA Controller driver");
MODULE_AUTHOR("Nicolas Ferre <[email protected]>");
MODULE_AUTHOR("Tudor Ambarus <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:at_hdmac");
| linux-master | drivers/dma/at_hdmac.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2014 Emilio López
* Emilio López <[email protected]>
*/
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include "virt-dma.h"
/** Common macros to normal and dedicated DMA registers **/
#define SUN4I_DMA_CFG_LOADING BIT(31)
#define SUN4I_DMA_CFG_DST_DATA_WIDTH(width) ((width) << 25)
#define SUN4I_DMA_CFG_DST_BURST_LENGTH(len) ((len) << 23)
#define SUN4I_DMA_CFG_DST_ADDR_MODE(mode) ((mode) << 21)
#define SUN4I_DMA_CFG_DST_DRQ_TYPE(type) ((type) << 16)
#define SUN4I_DMA_CFG_SRC_DATA_WIDTH(width) ((width) << 9)
#define SUN4I_DMA_CFG_SRC_BURST_LENGTH(len) ((len) << 7)
#define SUN4I_DMA_CFG_SRC_ADDR_MODE(mode) ((mode) << 5)
#define SUN4I_DMA_CFG_SRC_DRQ_TYPE(type) (type)
/** Normal DMA register values **/
/* Normal DMA source/destination data request type values */
#define SUN4I_NDMA_DRQ_TYPE_SDRAM 0x16
#define SUN4I_NDMA_DRQ_TYPE_LIMIT (0x1F + 1)
/** Normal DMA register layout **/
/* Dedicated DMA source/destination address mode values */
#define SUN4I_NDMA_ADDR_MODE_LINEAR 0
#define SUN4I_NDMA_ADDR_MODE_IO 1
/* Normal DMA configuration register layout */
#define SUN4I_NDMA_CFG_CONT_MODE BIT(30)
#define SUN4I_NDMA_CFG_WAIT_STATE(n) ((n) << 27)
#define SUN4I_NDMA_CFG_DST_NON_SECURE BIT(22)
#define SUN4I_NDMA_CFG_BYTE_COUNT_MODE_REMAIN BIT(15)
#define SUN4I_NDMA_CFG_SRC_NON_SECURE BIT(6)
/** Dedicated DMA register values **/
/* Dedicated DMA source/destination address mode values */
#define SUN4I_DDMA_ADDR_MODE_LINEAR 0
#define SUN4I_DDMA_ADDR_MODE_IO 1
#define SUN4I_DDMA_ADDR_MODE_HORIZONTAL_PAGE 2
#define SUN4I_DDMA_ADDR_MODE_VERTICAL_PAGE 3
/* Dedicated DMA source/destination data request type values */
#define SUN4I_DDMA_DRQ_TYPE_SDRAM 0x1
#define SUN4I_DDMA_DRQ_TYPE_LIMIT (0x1F + 1)
/** Dedicated DMA register layout **/
/* Dedicated DMA configuration register layout */
#define SUN4I_DDMA_CFG_BUSY BIT(30)
#define SUN4I_DDMA_CFG_CONT_MODE BIT(29)
#define SUN4I_DDMA_CFG_DST_NON_SECURE BIT(28)
#define SUN4I_DDMA_CFG_BYTE_COUNT_MODE_REMAIN BIT(15)
#define SUN4I_DDMA_CFG_SRC_NON_SECURE BIT(12)
/* Dedicated DMA parameter register layout */
#define SUN4I_DDMA_PARA_DST_DATA_BLK_SIZE(n) (((n) - 1) << 24)
#define SUN4I_DDMA_PARA_DST_WAIT_CYCLES(n) (((n) - 1) << 16)
#define SUN4I_DDMA_PARA_SRC_DATA_BLK_SIZE(n) (((n) - 1) << 8)
#define SUN4I_DDMA_PARA_SRC_WAIT_CYCLES(n) (((n) - 1) << 0)
/** DMA register offsets **/
/* General register offsets */
#define SUN4I_DMA_IRQ_ENABLE_REG 0x0
#define SUN4I_DMA_IRQ_PENDING_STATUS_REG 0x4
/* Normal DMA register offsets */
#define SUN4I_NDMA_CHANNEL_REG_BASE(n) (0x100 + (n) * 0x20)
#define SUN4I_NDMA_CFG_REG 0x0
#define SUN4I_NDMA_SRC_ADDR_REG 0x4
#define SUN4I_NDMA_DST_ADDR_REG 0x8
#define SUN4I_NDMA_BYTE_COUNT_REG 0xC
/* Dedicated DMA register offsets */
#define SUN4I_DDMA_CHANNEL_REG_BASE(n) (0x300 + (n) * 0x20)
#define SUN4I_DDMA_CFG_REG 0x0
#define SUN4I_DDMA_SRC_ADDR_REG 0x4
#define SUN4I_DDMA_DST_ADDR_REG 0x8
#define SUN4I_DDMA_BYTE_COUNT_REG 0xC
#define SUN4I_DDMA_PARA_REG 0x18
/** DMA Driver **/
/*
* Normal DMA has 8 channels, and Dedicated DMA has another 8, so
* that's 16 channels. As for endpoints, there's 29 and 21
* respectively. Given that the Normal DMA endpoints (other than
* SDRAM) can be used as tx/rx, we need 78 vchans in total
*/
#define SUN4I_NDMA_NR_MAX_CHANNELS 8
#define SUN4I_DDMA_NR_MAX_CHANNELS 8
#define SUN4I_DMA_NR_MAX_CHANNELS \
(SUN4I_NDMA_NR_MAX_CHANNELS + SUN4I_DDMA_NR_MAX_CHANNELS)
#define SUN4I_NDMA_NR_MAX_VCHANS (29 * 2 - 1)
#define SUN4I_DDMA_NR_MAX_VCHANS 21
#define SUN4I_DMA_NR_MAX_VCHANS \
(SUN4I_NDMA_NR_MAX_VCHANS + SUN4I_DDMA_NR_MAX_VCHANS)
/* This set of SUN4I_DDMA timing parameters were found experimentally while
* working with the SPI driver and seem to make it behave correctly */
#define SUN4I_DDMA_MAGIC_SPI_PARAMETERS \
(SUN4I_DDMA_PARA_DST_DATA_BLK_SIZE(1) | \
SUN4I_DDMA_PARA_SRC_DATA_BLK_SIZE(1) | \
SUN4I_DDMA_PARA_DST_WAIT_CYCLES(2) | \
SUN4I_DDMA_PARA_SRC_WAIT_CYCLES(2))
/*
* Normal DMA supports individual transfers (segments) up to 128k.
* Dedicated DMA supports transfers up to 16M. We can only report
* one size limit, so we have to use the smaller value.
*/
#define SUN4I_NDMA_MAX_SEG_SIZE SZ_128K
#define SUN4I_DDMA_MAX_SEG_SIZE SZ_16M
#define SUN4I_DMA_MAX_SEG_SIZE SUN4I_NDMA_MAX_SEG_SIZE
struct sun4i_dma_pchan {
/* Register base of channel */
void __iomem *base;
/* vchan currently being serviced */
struct sun4i_dma_vchan *vchan;
/* Is this a dedicated pchan? */
int is_dedicated;
};
struct sun4i_dma_vchan {
struct virt_dma_chan vc;
struct dma_slave_config cfg;
struct sun4i_dma_pchan *pchan;
struct sun4i_dma_promise *processing;
struct sun4i_dma_contract *contract;
u8 endpoint;
int is_dedicated;
};
struct sun4i_dma_promise {
u32 cfg;
u32 para;
dma_addr_t src;
dma_addr_t dst;
size_t len;
struct list_head list;
};
/* A contract is a set of promises */
struct sun4i_dma_contract {
struct virt_dma_desc vd;
struct list_head demands;
struct list_head completed_demands;
bool is_cyclic : 1;
bool use_half_int : 1;
};
struct sun4i_dma_dev {
DECLARE_BITMAP(pchans_used, SUN4I_DMA_NR_MAX_CHANNELS);
struct dma_device slave;
struct sun4i_dma_pchan *pchans;
struct sun4i_dma_vchan *vchans;
void __iomem *base;
struct clk *clk;
int irq;
spinlock_t lock;
};
static struct sun4i_dma_dev *to_sun4i_dma_dev(struct dma_device *dev)
{
return container_of(dev, struct sun4i_dma_dev, slave);
}
static struct sun4i_dma_vchan *to_sun4i_dma_vchan(struct dma_chan *chan)
{
return container_of(chan, struct sun4i_dma_vchan, vc.chan);
}
static struct sun4i_dma_contract *to_sun4i_dma_contract(struct virt_dma_desc *vd)
{
return container_of(vd, struct sun4i_dma_contract, vd);
}
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static int convert_burst(u32 maxburst)
{
if (maxburst > 8)
return -EINVAL;
/* 1 -> 0, 4 -> 1, 8 -> 2 */
return (maxburst >> 2);
}
static int convert_buswidth(enum dma_slave_buswidth addr_width)
{
if (addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES)
return -EINVAL;
/* 8 (1 byte) -> 0, 16 (2 bytes) -> 1, 32 (4 bytes) -> 2 */
return (addr_width >> 1);
}
static void sun4i_dma_free_chan_resources(struct dma_chan *chan)
{
struct sun4i_dma_vchan *vchan = to_sun4i_dma_vchan(chan);
vchan_free_chan_resources(&vchan->vc);
}
static struct sun4i_dma_pchan *find_and_use_pchan(struct sun4i_dma_dev *priv,
struct sun4i_dma_vchan *vchan)
{
struct sun4i_dma_pchan *pchan = NULL, *pchans = priv->pchans;
unsigned long flags;
int i, max;
/*
* pchans 0-SUN4I_NDMA_NR_MAX_CHANNELS are normal, and
* SUN4I_NDMA_NR_MAX_CHANNELS+ are dedicated ones
*/
if (vchan->is_dedicated) {
i = SUN4I_NDMA_NR_MAX_CHANNELS;
max = SUN4I_DMA_NR_MAX_CHANNELS;
} else {
i = 0;
max = SUN4I_NDMA_NR_MAX_CHANNELS;
}
spin_lock_irqsave(&priv->lock, flags);
for_each_clear_bit_from(i, priv->pchans_used, max) {
pchan = &pchans[i];
pchan->vchan = vchan;
set_bit(i, priv->pchans_used);
break;
}
spin_unlock_irqrestore(&priv->lock, flags);
return pchan;
}
static void release_pchan(struct sun4i_dma_dev *priv,
struct sun4i_dma_pchan *pchan)
{
unsigned long flags;
int nr = pchan - priv->pchans;
spin_lock_irqsave(&priv->lock, flags);
pchan->vchan = NULL;
clear_bit(nr, priv->pchans_used);
spin_unlock_irqrestore(&priv->lock, flags);
}
static void configure_pchan(struct sun4i_dma_pchan *pchan,
struct sun4i_dma_promise *d)
{
/*
* Configure addresses and misc parameters depending on type
* SUN4I_DDMA has an extra field with timing parameters
*/
if (pchan->is_dedicated) {
writel_relaxed(d->src, pchan->base + SUN4I_DDMA_SRC_ADDR_REG);
writel_relaxed(d->dst, pchan->base + SUN4I_DDMA_DST_ADDR_REG);
writel_relaxed(d->len, pchan->base + SUN4I_DDMA_BYTE_COUNT_REG);
writel_relaxed(d->para, pchan->base + SUN4I_DDMA_PARA_REG);
writel_relaxed(d->cfg, pchan->base + SUN4I_DDMA_CFG_REG);
} else {
writel_relaxed(d->src, pchan->base + SUN4I_NDMA_SRC_ADDR_REG);
writel_relaxed(d->dst, pchan->base + SUN4I_NDMA_DST_ADDR_REG);
writel_relaxed(d->len, pchan->base + SUN4I_NDMA_BYTE_COUNT_REG);
writel_relaxed(d->cfg, pchan->base + SUN4I_NDMA_CFG_REG);
}
}
static void set_pchan_interrupt(struct sun4i_dma_dev *priv,
struct sun4i_dma_pchan *pchan,
int half, int end)
{
u32 reg;
int pchan_number = pchan - priv->pchans;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
reg = readl_relaxed(priv->base + SUN4I_DMA_IRQ_ENABLE_REG);
if (half)
reg |= BIT(pchan_number * 2);
else
reg &= ~BIT(pchan_number * 2);
if (end)
reg |= BIT(pchan_number * 2 + 1);
else
reg &= ~BIT(pchan_number * 2 + 1);
writel_relaxed(reg, priv->base + SUN4I_DMA_IRQ_ENABLE_REG);
spin_unlock_irqrestore(&priv->lock, flags);
}
/*
* Execute pending operations on a vchan
*
* When given a vchan, this function will try to acquire a suitable
* pchan and, if successful, will configure it to fulfill a promise
* from the next pending contract.
*
* This function must be called with &vchan->vc.lock held.
*/
static int __execute_vchan_pending(struct sun4i_dma_dev *priv,
struct sun4i_dma_vchan *vchan)
{
struct sun4i_dma_promise *promise = NULL;
struct sun4i_dma_contract *contract = NULL;
struct sun4i_dma_pchan *pchan;
struct virt_dma_desc *vd;
int ret;
lockdep_assert_held(&vchan->vc.lock);
/* We need a pchan to do anything, so secure one if available */
pchan = find_and_use_pchan(priv, vchan);
if (!pchan)
return -EBUSY;
/*
* Channel endpoints must not be repeated, so if this vchan
* has already submitted some work, we can't do anything else
*/
if (vchan->processing) {
dev_dbg(chan2dev(&vchan->vc.chan),
"processing something to this endpoint already\n");
ret = -EBUSY;
goto release_pchan;
}
do {
/* Figure out which contract we're working with today */
vd = vchan_next_desc(&vchan->vc);
if (!vd) {
dev_dbg(chan2dev(&vchan->vc.chan),
"No pending contract found");
ret = 0;
goto release_pchan;
}
contract = to_sun4i_dma_contract(vd);
if (list_empty(&contract->demands)) {
/* The contract has been completed so mark it as such */
list_del(&contract->vd.node);
vchan_cookie_complete(&contract->vd);
dev_dbg(chan2dev(&vchan->vc.chan),
"Empty contract found and marked complete");
}
} while (list_empty(&contract->demands));
/* Now find out what we need to do */
promise = list_first_entry(&contract->demands,
struct sun4i_dma_promise, list);
vchan->processing = promise;
/* ... and make it reality */
if (promise) {
vchan->contract = contract;
vchan->pchan = pchan;
set_pchan_interrupt(priv, pchan, contract->use_half_int, 1);
configure_pchan(pchan, promise);
}
return 0;
release_pchan:
release_pchan(priv, pchan);
return ret;
}
static int sanitize_config(struct dma_slave_config *sconfig,
enum dma_transfer_direction direction)
{
switch (direction) {
case DMA_MEM_TO_DEV:
if ((sconfig->dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) ||
!sconfig->dst_maxburst)
return -EINVAL;
if (sconfig->src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
sconfig->src_addr_width = sconfig->dst_addr_width;
if (!sconfig->src_maxburst)
sconfig->src_maxburst = sconfig->dst_maxburst;
break;
case DMA_DEV_TO_MEM:
if ((sconfig->src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) ||
!sconfig->src_maxburst)
return -EINVAL;
if (sconfig->dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
sconfig->dst_addr_width = sconfig->src_addr_width;
if (!sconfig->dst_maxburst)
sconfig->dst_maxburst = sconfig->src_maxburst;
break;
default:
return 0;
}
return 0;
}
/*
* Generate a promise, to be used in a normal DMA contract.
*
* A NDMA promise contains all the information required to program the
* normal part of the DMA Engine and get data copied. A non-executed
* promise will live in the demands list on a contract. Once it has been
* completed, it will be moved to the completed demands list for later freeing.
* All linked promises will be freed when the corresponding contract is freed
*/
static struct sun4i_dma_promise *
generate_ndma_promise(struct dma_chan *chan, dma_addr_t src, dma_addr_t dest,
size_t len, struct dma_slave_config *sconfig,
enum dma_transfer_direction direction)
{
struct sun4i_dma_promise *promise;
int ret;
ret = sanitize_config(sconfig, direction);
if (ret)
return NULL;
promise = kzalloc(sizeof(*promise), GFP_NOWAIT);
if (!promise)
return NULL;
promise->src = src;
promise->dst = dest;
promise->len = len;
promise->cfg = SUN4I_DMA_CFG_LOADING |
SUN4I_NDMA_CFG_BYTE_COUNT_MODE_REMAIN;
dev_dbg(chan2dev(chan),
"src burst %d, dst burst %d, src buswidth %d, dst buswidth %d",
sconfig->src_maxburst, sconfig->dst_maxburst,
sconfig->src_addr_width, sconfig->dst_addr_width);
/* Source burst */
ret = convert_burst(sconfig->src_maxburst);
if (ret < 0)
goto fail;
promise->cfg |= SUN4I_DMA_CFG_SRC_BURST_LENGTH(ret);
/* Destination burst */
ret = convert_burst(sconfig->dst_maxburst);
if (ret < 0)
goto fail;
promise->cfg |= SUN4I_DMA_CFG_DST_BURST_LENGTH(ret);
/* Source bus width */
ret = convert_buswidth(sconfig->src_addr_width);
if (ret < 0)
goto fail;
promise->cfg |= SUN4I_DMA_CFG_SRC_DATA_WIDTH(ret);
/* Destination bus width */
ret = convert_buswidth(sconfig->dst_addr_width);
if (ret < 0)
goto fail;
promise->cfg |= SUN4I_DMA_CFG_DST_DATA_WIDTH(ret);
return promise;
fail:
kfree(promise);
return NULL;
}
/*
* Generate a promise, to be used in a dedicated DMA contract.
*
* A DDMA promise contains all the information required to program the
* Dedicated part of the DMA Engine and get data copied. A non-executed
* promise will live in the demands list on a contract. Once it has been
* completed, it will be moved to the completed demands list for later freeing.
* All linked promises will be freed when the corresponding contract is freed
*/
static struct sun4i_dma_promise *
generate_ddma_promise(struct dma_chan *chan, dma_addr_t src, dma_addr_t dest,
size_t len, struct dma_slave_config *sconfig)
{
struct sun4i_dma_promise *promise;
int ret;
promise = kzalloc(sizeof(*promise), GFP_NOWAIT);
if (!promise)
return NULL;
promise->src = src;
promise->dst = dest;
promise->len = len;
promise->cfg = SUN4I_DMA_CFG_LOADING |
SUN4I_DDMA_CFG_BYTE_COUNT_MODE_REMAIN;
/* Source burst */
ret = convert_burst(sconfig->src_maxburst);
if (ret < 0)
goto fail;
promise->cfg |= SUN4I_DMA_CFG_SRC_BURST_LENGTH(ret);
/* Destination burst */
ret = convert_burst(sconfig->dst_maxburst);
if (ret < 0)
goto fail;
promise->cfg |= SUN4I_DMA_CFG_DST_BURST_LENGTH(ret);
/* Source bus width */
ret = convert_buswidth(sconfig->src_addr_width);
if (ret < 0)
goto fail;
promise->cfg |= SUN4I_DMA_CFG_SRC_DATA_WIDTH(ret);
/* Destination bus width */
ret = convert_buswidth(sconfig->dst_addr_width);
if (ret < 0)
goto fail;
promise->cfg |= SUN4I_DMA_CFG_DST_DATA_WIDTH(ret);
return promise;
fail:
kfree(promise);
return NULL;
}
/*
* Generate a contract
*
* Contracts function as DMA descriptors. As our hardware does not support
* linked lists, we need to implement SG via software. We use a contract
* to hold all the pieces of the request and process them serially one
* after another. Each piece is represented as a promise.
*/
static struct sun4i_dma_contract *generate_dma_contract(void)
{
struct sun4i_dma_contract *contract;
contract = kzalloc(sizeof(*contract), GFP_NOWAIT);
if (!contract)
return NULL;
INIT_LIST_HEAD(&contract->demands);
INIT_LIST_HEAD(&contract->completed_demands);
return contract;
}
/*
* Get next promise on a cyclic transfer
*
* Cyclic contracts contain a series of promises which are executed on a
* loop. This function returns the next promise from a cyclic contract,
* so it can be programmed into the hardware.
*/
static struct sun4i_dma_promise *
get_next_cyclic_promise(struct sun4i_dma_contract *contract)
{
struct sun4i_dma_promise *promise;
promise = list_first_entry_or_null(&contract->demands,
struct sun4i_dma_promise, list);
if (!promise) {
list_splice_init(&contract->completed_demands,
&contract->demands);
promise = list_first_entry(&contract->demands,
struct sun4i_dma_promise, list);
}
return promise;
}
/*
* Free a contract and all its associated promises
*/
static void sun4i_dma_free_contract(struct virt_dma_desc *vd)
{
struct sun4i_dma_contract *contract = to_sun4i_dma_contract(vd);
struct sun4i_dma_promise *promise, *tmp;
/* Free all the demands and completed demands */
list_for_each_entry_safe(promise, tmp, &contract->demands, list)
kfree(promise);
list_for_each_entry_safe(promise, tmp, &contract->completed_demands, list)
kfree(promise);
kfree(contract);
}
static struct dma_async_tx_descriptor *
sun4i_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest,
dma_addr_t src, size_t len, unsigned long flags)
{
struct sun4i_dma_vchan *vchan = to_sun4i_dma_vchan(chan);
struct dma_slave_config *sconfig = &vchan->cfg;
struct sun4i_dma_promise *promise;
struct sun4i_dma_contract *contract;
contract = generate_dma_contract();
if (!contract)
return NULL;
/*
* We can only do the copy to bus aligned addresses, so
* choose the best one so we get decent performance. We also
* maximize the burst size for this same reason.
*/
sconfig->src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
sconfig->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
sconfig->src_maxburst = 8;
sconfig->dst_maxburst = 8;
if (vchan->is_dedicated)
promise = generate_ddma_promise(chan, src, dest, len, sconfig);
else
promise = generate_ndma_promise(chan, src, dest, len, sconfig,
DMA_MEM_TO_MEM);
if (!promise) {
kfree(contract);
return NULL;
}
/* Configure memcpy mode */
if (vchan->is_dedicated) {
promise->cfg |= SUN4I_DMA_CFG_SRC_DRQ_TYPE(SUN4I_DDMA_DRQ_TYPE_SDRAM) |
SUN4I_DMA_CFG_DST_DRQ_TYPE(SUN4I_DDMA_DRQ_TYPE_SDRAM);
} else {
promise->cfg |= SUN4I_DMA_CFG_SRC_DRQ_TYPE(SUN4I_NDMA_DRQ_TYPE_SDRAM) |
SUN4I_DMA_CFG_DST_DRQ_TYPE(SUN4I_NDMA_DRQ_TYPE_SDRAM);
}
/* Fill the contract with our only promise */
list_add_tail(&promise->list, &contract->demands);
/* And add it to the vchan */
return vchan_tx_prep(&vchan->vc, &contract->vd, flags);
}
static struct dma_async_tx_descriptor *
sun4i_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf, size_t len,
size_t period_len, enum dma_transfer_direction dir,
unsigned long flags)
{
struct sun4i_dma_vchan *vchan = to_sun4i_dma_vchan(chan);
struct dma_slave_config *sconfig = &vchan->cfg;
struct sun4i_dma_promise *promise;
struct sun4i_dma_contract *contract;
dma_addr_t src, dest;
u32 endpoints;
int nr_periods, offset, plength, i;
u8 ram_type, io_mode, linear_mode;
if (!is_slave_direction(dir)) {
dev_err(chan2dev(chan), "Invalid DMA direction\n");
return NULL;
}
contract = generate_dma_contract();
if (!contract)
return NULL;
contract->is_cyclic = 1;
if (vchan->is_dedicated) {
io_mode = SUN4I_DDMA_ADDR_MODE_IO;
linear_mode = SUN4I_DDMA_ADDR_MODE_LINEAR;
ram_type = SUN4I_DDMA_DRQ_TYPE_SDRAM;
} else {
io_mode = SUN4I_NDMA_ADDR_MODE_IO;
linear_mode = SUN4I_NDMA_ADDR_MODE_LINEAR;
ram_type = SUN4I_NDMA_DRQ_TYPE_SDRAM;
}
if (dir == DMA_MEM_TO_DEV) {
src = buf;
dest = sconfig->dst_addr;
endpoints = SUN4I_DMA_CFG_DST_DRQ_TYPE(vchan->endpoint) |
SUN4I_DMA_CFG_DST_ADDR_MODE(io_mode) |
SUN4I_DMA_CFG_SRC_DRQ_TYPE(ram_type) |
SUN4I_DMA_CFG_SRC_ADDR_MODE(linear_mode);
} else {
src = sconfig->src_addr;
dest = buf;
endpoints = SUN4I_DMA_CFG_DST_DRQ_TYPE(ram_type) |
SUN4I_DMA_CFG_DST_ADDR_MODE(linear_mode) |
SUN4I_DMA_CFG_SRC_DRQ_TYPE(vchan->endpoint) |
SUN4I_DMA_CFG_SRC_ADDR_MODE(io_mode);
}
/*
* We will be using half done interrupts to make two periods
* out of a promise, so we need to program the DMA engine less
* often
*/
/*
* The engine can interrupt on half-transfer, so we can use
* this feature to program the engine half as often as if we
* didn't use it (keep in mind the hardware doesn't support
* linked lists).
*
* Say you have a set of periods (| marks the start/end, I for
* interrupt, P for programming the engine to do a new
* transfer), the easy but slow way would be to do
*
* |---|---|---|---| (periods / promises)
* P I,P I,P I,P I
*
* Using half transfer interrupts you can do
*
* |-------|-------| (promises as configured on hw)
* |---|---|---|---| (periods)
* P I I,P I I
*
* Which requires half the engine programming for the same
* functionality.
*
* This only works if two periods fit in a single promise. That will
* always be the case for dedicated DMA, where the hardware has a much
* larger maximum transfer size than advertised to clients.
*/
if (vchan->is_dedicated || period_len <= SUN4I_NDMA_MAX_SEG_SIZE / 2) {
period_len *= 2;
contract->use_half_int = 1;
}
nr_periods = DIV_ROUND_UP(len, period_len);
for (i = 0; i < nr_periods; i++) {
/* Calculate the offset in the buffer and the length needed */
offset = i * period_len;
plength = min((len - offset), period_len);
if (dir == DMA_MEM_TO_DEV)
src = buf + offset;
else
dest = buf + offset;
/* Make the promise */
if (vchan->is_dedicated)
promise = generate_ddma_promise(chan, src, dest,
plength, sconfig);
else
promise = generate_ndma_promise(chan, src, dest,
plength, sconfig, dir);
if (!promise) {
/* TODO: should we free everything? */
return NULL;
}
promise->cfg |= endpoints;
/* Then add it to the contract */
list_add_tail(&promise->list, &contract->demands);
}
/* And add it to the vchan */
return vchan_tx_prep(&vchan->vc, &contract->vd, flags);
}
static struct dma_async_tx_descriptor *
sun4i_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct sun4i_dma_vchan *vchan = to_sun4i_dma_vchan(chan);
struct dma_slave_config *sconfig = &vchan->cfg;
struct sun4i_dma_promise *promise;
struct sun4i_dma_contract *contract;
u8 ram_type, io_mode, linear_mode;
struct scatterlist *sg;
dma_addr_t srcaddr, dstaddr;
u32 endpoints, para;
int i;
if (!sgl)
return NULL;
if (!is_slave_direction(dir)) {
dev_err(chan2dev(chan), "Invalid DMA direction\n");
return NULL;
}
contract = generate_dma_contract();
if (!contract)
return NULL;
if (vchan->is_dedicated) {
io_mode = SUN4I_DDMA_ADDR_MODE_IO;
linear_mode = SUN4I_DDMA_ADDR_MODE_LINEAR;
ram_type = SUN4I_DDMA_DRQ_TYPE_SDRAM;
} else {
io_mode = SUN4I_NDMA_ADDR_MODE_IO;
linear_mode = SUN4I_NDMA_ADDR_MODE_LINEAR;
ram_type = SUN4I_NDMA_DRQ_TYPE_SDRAM;
}
if (dir == DMA_MEM_TO_DEV)
endpoints = SUN4I_DMA_CFG_DST_DRQ_TYPE(vchan->endpoint) |
SUN4I_DMA_CFG_DST_ADDR_MODE(io_mode) |
SUN4I_DMA_CFG_SRC_DRQ_TYPE(ram_type) |
SUN4I_DMA_CFG_SRC_ADDR_MODE(linear_mode);
else
endpoints = SUN4I_DMA_CFG_DST_DRQ_TYPE(ram_type) |
SUN4I_DMA_CFG_DST_ADDR_MODE(linear_mode) |
SUN4I_DMA_CFG_SRC_DRQ_TYPE(vchan->endpoint) |
SUN4I_DMA_CFG_SRC_ADDR_MODE(io_mode);
for_each_sg(sgl, sg, sg_len, i) {
/* Figure out addresses */
if (dir == DMA_MEM_TO_DEV) {
srcaddr = sg_dma_address(sg);
dstaddr = sconfig->dst_addr;
} else {
srcaddr = sconfig->src_addr;
dstaddr = sg_dma_address(sg);
}
/*
* These are the magic DMA engine timings that keep SPI going.
* I haven't seen any interface on DMAEngine to configure
* timings, and so far they seem to work for everything we
* support, so I've kept them here. I don't know if other
* devices need different timings because, as usual, we only
* have the "para" bitfield meanings, but no comment on what
* the values should be when doing a certain operation :|
*/
para = SUN4I_DDMA_MAGIC_SPI_PARAMETERS;
/* And make a suitable promise */
if (vchan->is_dedicated)
promise = generate_ddma_promise(chan, srcaddr, dstaddr,
sg_dma_len(sg),
sconfig);
else
promise = generate_ndma_promise(chan, srcaddr, dstaddr,
sg_dma_len(sg),
sconfig, dir);
if (!promise)
return NULL; /* TODO: should we free everything? */
promise->cfg |= endpoints;
promise->para = para;
/* Then add it to the contract */
list_add_tail(&promise->list, &contract->demands);
}
/*
* Once we've got all the promises ready, add the contract
* to the pending list on the vchan
*/
return vchan_tx_prep(&vchan->vc, &contract->vd, flags);
}
static int sun4i_dma_terminate_all(struct dma_chan *chan)
{
struct sun4i_dma_dev *priv = to_sun4i_dma_dev(chan->device);
struct sun4i_dma_vchan *vchan = to_sun4i_dma_vchan(chan);
struct sun4i_dma_pchan *pchan = vchan->pchan;
LIST_HEAD(head);
unsigned long flags;
spin_lock_irqsave(&vchan->vc.lock, flags);
vchan_get_all_descriptors(&vchan->vc, &head);
spin_unlock_irqrestore(&vchan->vc.lock, flags);
/*
* Clearing the configuration register will halt the pchan. Interrupts
* may still trigger, so don't forget to disable them.
*/
if (pchan) {
if (pchan->is_dedicated)
writel(0, pchan->base + SUN4I_DDMA_CFG_REG);
else
writel(0, pchan->base + SUN4I_NDMA_CFG_REG);
set_pchan_interrupt(priv, pchan, 0, 0);
release_pchan(priv, pchan);
}
spin_lock_irqsave(&vchan->vc.lock, flags);
/* Clear these so the vchan is usable again */
vchan->processing = NULL;
vchan->pchan = NULL;
spin_unlock_irqrestore(&vchan->vc.lock, flags);
vchan_dma_desc_free_list(&vchan->vc, &head);
return 0;
}
static int sun4i_dma_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct sun4i_dma_vchan *vchan = to_sun4i_dma_vchan(chan);
memcpy(&vchan->cfg, config, sizeof(*config));
return 0;
}
static struct dma_chan *sun4i_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct sun4i_dma_dev *priv = ofdma->of_dma_data;
struct sun4i_dma_vchan *vchan;
struct dma_chan *chan;
u8 is_dedicated = dma_spec->args[0];
u8 endpoint = dma_spec->args[1];
/* Check if type is Normal or Dedicated */
if (is_dedicated != 0 && is_dedicated != 1)
return NULL;
/* Make sure the endpoint looks sane */
if ((is_dedicated && endpoint >= SUN4I_DDMA_DRQ_TYPE_LIMIT) ||
(!is_dedicated && endpoint >= SUN4I_NDMA_DRQ_TYPE_LIMIT))
return NULL;
chan = dma_get_any_slave_channel(&priv->slave);
if (!chan)
return NULL;
/* Assign the endpoint to the vchan */
vchan = to_sun4i_dma_vchan(chan);
vchan->is_dedicated = is_dedicated;
vchan->endpoint = endpoint;
return chan;
}
static enum dma_status sun4i_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *state)
{
struct sun4i_dma_vchan *vchan = to_sun4i_dma_vchan(chan);
struct sun4i_dma_pchan *pchan = vchan->pchan;
struct sun4i_dma_contract *contract;
struct sun4i_dma_promise *promise;
struct virt_dma_desc *vd;
unsigned long flags;
enum dma_status ret;
size_t bytes = 0;
ret = dma_cookie_status(chan, cookie, state);
if (!state || (ret == DMA_COMPLETE))
return ret;
spin_lock_irqsave(&vchan->vc.lock, flags);
vd = vchan_find_desc(&vchan->vc, cookie);
if (!vd)
goto exit;
contract = to_sun4i_dma_contract(vd);
list_for_each_entry(promise, &contract->demands, list)
bytes += promise->len;
/*
* The hardware is configured to return the remaining byte
* quantity. If possible, replace the first listed element's
* full size with the actual remaining amount
*/
promise = list_first_entry_or_null(&contract->demands,
struct sun4i_dma_promise, list);
if (promise && pchan) {
bytes -= promise->len;
if (pchan->is_dedicated)
bytes += readl(pchan->base + SUN4I_DDMA_BYTE_COUNT_REG);
else
bytes += readl(pchan->base + SUN4I_NDMA_BYTE_COUNT_REG);
}
exit:
dma_set_residue(state, bytes);
spin_unlock_irqrestore(&vchan->vc.lock, flags);
return ret;
}
static void sun4i_dma_issue_pending(struct dma_chan *chan)
{
struct sun4i_dma_dev *priv = to_sun4i_dma_dev(chan->device);
struct sun4i_dma_vchan *vchan = to_sun4i_dma_vchan(chan);
unsigned long flags;
spin_lock_irqsave(&vchan->vc.lock, flags);
/*
* If there are pending transactions for this vchan, push one of
* them into the engine to get the ball rolling.
*/
if (vchan_issue_pending(&vchan->vc))
__execute_vchan_pending(priv, vchan);
spin_unlock_irqrestore(&vchan->vc.lock, flags);
}
static irqreturn_t sun4i_dma_interrupt(int irq, void *dev_id)
{
struct sun4i_dma_dev *priv = dev_id;
struct sun4i_dma_pchan *pchans = priv->pchans, *pchan;
struct sun4i_dma_vchan *vchan;
struct sun4i_dma_contract *contract;
struct sun4i_dma_promise *promise;
unsigned long pendirq, irqs, disableirqs;
int bit, i, free_room, allow_mitigation = 1;
pendirq = readl_relaxed(priv->base + SUN4I_DMA_IRQ_PENDING_STATUS_REG);
handle_pending:
disableirqs = 0;
free_room = 0;
for_each_set_bit(bit, &pendirq, 32) {
pchan = &pchans[bit >> 1];
vchan = pchan->vchan;
if (!vchan) /* a terminated channel may still interrupt */
continue;
contract = vchan->contract;
/*
* Disable the IRQ and free the pchan if it's an end
* interrupt (odd bit)
*/
if (bit & 1) {
spin_lock(&vchan->vc.lock);
/*
* Move the promise into the completed list now that
* we're done with it
*/
list_move_tail(&vchan->processing->list,
&contract->completed_demands);
/*
* Cyclic DMA transfers are special:
* - There's always something we can dispatch
* - We need to run the callback
* - Latency is very important, as this is used by audio
* We therefore just cycle through the list and dispatch
* whatever we have here, reusing the pchan. There's
* no need to run the thread after this.
*
* For non-cyclic transfers we need to look around,
* so we can program some more work, or notify the
* client that their transfers have been completed.
*/
if (contract->is_cyclic) {
promise = get_next_cyclic_promise(contract);
vchan->processing = promise;
configure_pchan(pchan, promise);
vchan_cyclic_callback(&contract->vd);
} else {
vchan->processing = NULL;
vchan->pchan = NULL;
free_room = 1;
disableirqs |= BIT(bit);
release_pchan(priv, pchan);
}
spin_unlock(&vchan->vc.lock);
} else {
/* Half done interrupt */
if (contract->is_cyclic)
vchan_cyclic_callback(&contract->vd);
else
disableirqs |= BIT(bit);
}
}
/* Disable the IRQs for events we handled */
spin_lock(&priv->lock);
irqs = readl_relaxed(priv->base + SUN4I_DMA_IRQ_ENABLE_REG);
writel_relaxed(irqs & ~disableirqs,
priv->base + SUN4I_DMA_IRQ_ENABLE_REG);
spin_unlock(&priv->lock);
/* Writing 1 to the pending field will clear the pending interrupt */
writel_relaxed(pendirq, priv->base + SUN4I_DMA_IRQ_PENDING_STATUS_REG);
/*
* If a pchan was freed, we may be able to schedule something else,
* so have a look around
*/
if (free_room) {
for (i = 0; i < SUN4I_DMA_NR_MAX_VCHANS; i++) {
vchan = &priv->vchans[i];
spin_lock(&vchan->vc.lock);
__execute_vchan_pending(priv, vchan);
spin_unlock(&vchan->vc.lock);
}
}
/*
* Handle newer interrupts if some showed up, but only do it once
* to avoid a too long a loop
*/
if (allow_mitigation) {
pendirq = readl_relaxed(priv->base +
SUN4I_DMA_IRQ_PENDING_STATUS_REG);
if (pendirq) {
allow_mitigation = 0;
goto handle_pending;
}
}
return IRQ_HANDLED;
}
static int sun4i_dma_probe(struct platform_device *pdev)
{
struct sun4i_dma_dev *priv;
int i, j, ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
priv->irq = platform_get_irq(pdev, 0);
if (priv->irq < 0)
return priv->irq;
priv->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(&pdev->dev, "No clock specified\n");
return PTR_ERR(priv->clk);
}
platform_set_drvdata(pdev, priv);
spin_lock_init(&priv->lock);
dma_set_max_seg_size(&pdev->dev, SUN4I_DMA_MAX_SEG_SIZE);
dma_cap_zero(priv->slave.cap_mask);
dma_cap_set(DMA_PRIVATE, priv->slave.cap_mask);
dma_cap_set(DMA_MEMCPY, priv->slave.cap_mask);
dma_cap_set(DMA_CYCLIC, priv->slave.cap_mask);
dma_cap_set(DMA_SLAVE, priv->slave.cap_mask);
INIT_LIST_HEAD(&priv->slave.channels);
priv->slave.device_free_chan_resources = sun4i_dma_free_chan_resources;
priv->slave.device_tx_status = sun4i_dma_tx_status;
priv->slave.device_issue_pending = sun4i_dma_issue_pending;
priv->slave.device_prep_slave_sg = sun4i_dma_prep_slave_sg;
priv->slave.device_prep_dma_memcpy = sun4i_dma_prep_dma_memcpy;
priv->slave.device_prep_dma_cyclic = sun4i_dma_prep_dma_cyclic;
priv->slave.device_config = sun4i_dma_config;
priv->slave.device_terminate_all = sun4i_dma_terminate_all;
priv->slave.copy_align = 2;
priv->slave.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
priv->slave.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
priv->slave.directions = BIT(DMA_DEV_TO_MEM) |
BIT(DMA_MEM_TO_DEV);
priv->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
priv->slave.dev = &pdev->dev;
priv->pchans = devm_kcalloc(&pdev->dev, SUN4I_DMA_NR_MAX_CHANNELS,
sizeof(struct sun4i_dma_pchan), GFP_KERNEL);
priv->vchans = devm_kcalloc(&pdev->dev, SUN4I_DMA_NR_MAX_VCHANS,
sizeof(struct sun4i_dma_vchan), GFP_KERNEL);
if (!priv->vchans || !priv->pchans)
return -ENOMEM;
/*
* [0..SUN4I_NDMA_NR_MAX_CHANNELS) are normal pchans, and
* [SUN4I_NDMA_NR_MAX_CHANNELS..SUN4I_DMA_NR_MAX_CHANNELS) are
* dedicated ones
*/
for (i = 0; i < SUN4I_NDMA_NR_MAX_CHANNELS; i++)
priv->pchans[i].base = priv->base +
SUN4I_NDMA_CHANNEL_REG_BASE(i);
for (j = 0; i < SUN4I_DMA_NR_MAX_CHANNELS; i++, j++) {
priv->pchans[i].base = priv->base +
SUN4I_DDMA_CHANNEL_REG_BASE(j);
priv->pchans[i].is_dedicated = 1;
}
for (i = 0; i < SUN4I_DMA_NR_MAX_VCHANS; i++) {
struct sun4i_dma_vchan *vchan = &priv->vchans[i];
spin_lock_init(&vchan->vc.lock);
vchan->vc.desc_free = sun4i_dma_free_contract;
vchan_init(&vchan->vc, &priv->slave);
}
ret = clk_prepare_enable(priv->clk);
if (ret) {
dev_err(&pdev->dev, "Couldn't enable the clock\n");
return ret;
}
/*
* Make sure the IRQs are all disabled and accounted for. The bootloader
* likes to leave these dirty
*/
writel(0, priv->base + SUN4I_DMA_IRQ_ENABLE_REG);
writel(0xFFFFFFFF, priv->base + SUN4I_DMA_IRQ_PENDING_STATUS_REG);
ret = devm_request_irq(&pdev->dev, priv->irq, sun4i_dma_interrupt,
0, dev_name(&pdev->dev), priv);
if (ret) {
dev_err(&pdev->dev, "Cannot request IRQ\n");
goto err_clk_disable;
}
ret = dma_async_device_register(&priv->slave);
if (ret) {
dev_warn(&pdev->dev, "Failed to register DMA engine device\n");
goto err_clk_disable;
}
ret = of_dma_controller_register(pdev->dev.of_node, sun4i_dma_of_xlate,
priv);
if (ret) {
dev_err(&pdev->dev, "of_dma_controller_register failed\n");
goto err_dma_unregister;
}
dev_dbg(&pdev->dev, "Successfully probed SUN4I_DMA\n");
return 0;
err_dma_unregister:
dma_async_device_unregister(&priv->slave);
err_clk_disable:
clk_disable_unprepare(priv->clk);
return ret;
}
static int sun4i_dma_remove(struct platform_device *pdev)
{
struct sun4i_dma_dev *priv = platform_get_drvdata(pdev);
/* Disable IRQ so no more work is scheduled */
disable_irq(priv->irq);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&priv->slave);
clk_disable_unprepare(priv->clk);
return 0;
}
static const struct of_device_id sun4i_dma_match[] = {
{ .compatible = "allwinner,sun4i-a10-dma" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, sun4i_dma_match);
static struct platform_driver sun4i_dma_driver = {
.probe = sun4i_dma_probe,
.remove = sun4i_dma_remove,
.driver = {
.name = "sun4i-dma",
.of_match_table = sun4i_dma_match,
},
};
module_platform_driver(sun4i_dma_driver);
MODULE_DESCRIPTION("Allwinner A10 Dedicated DMA Controller Driver");
MODULE_AUTHOR("Emilio López <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/sun4i-dma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for the Cirrus Logic EP93xx DMA Controller
*
* Copyright (C) 2011 Mika Westerberg
*
* DMA M2P implementation is based on the original
* arch/arm/mach-ep93xx/dma-m2p.c which has following copyrights:
*
* Copyright (C) 2006 Lennert Buytenhek <[email protected]>
* Copyright (C) 2006 Applied Data Systems
* Copyright (C) 2009 Ryan Mallon <[email protected]>
*
* This driver is based on dw_dmac and amba-pl08x drivers.
*/
#include <linux/clk.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/platform_data/dma-ep93xx.h>
#include "dmaengine.h"
/* M2P registers */
#define M2P_CONTROL 0x0000
#define M2P_CONTROL_STALLINT BIT(0)
#define M2P_CONTROL_NFBINT BIT(1)
#define M2P_CONTROL_CH_ERROR_INT BIT(3)
#define M2P_CONTROL_ENABLE BIT(4)
#define M2P_CONTROL_ICE BIT(6)
#define M2P_INTERRUPT 0x0004
#define M2P_INTERRUPT_STALL BIT(0)
#define M2P_INTERRUPT_NFB BIT(1)
#define M2P_INTERRUPT_ERROR BIT(3)
#define M2P_PPALLOC 0x0008
#define M2P_STATUS 0x000c
#define M2P_MAXCNT0 0x0020
#define M2P_BASE0 0x0024
#define M2P_MAXCNT1 0x0030
#define M2P_BASE1 0x0034
#define M2P_STATE_IDLE 0
#define M2P_STATE_STALL 1
#define M2P_STATE_ON 2
#define M2P_STATE_NEXT 3
/* M2M registers */
#define M2M_CONTROL 0x0000
#define M2M_CONTROL_DONEINT BIT(2)
#define M2M_CONTROL_ENABLE BIT(3)
#define M2M_CONTROL_START BIT(4)
#define M2M_CONTROL_DAH BIT(11)
#define M2M_CONTROL_SAH BIT(12)
#define M2M_CONTROL_PW_SHIFT 9
#define M2M_CONTROL_PW_8 (0 << M2M_CONTROL_PW_SHIFT)
#define M2M_CONTROL_PW_16 (1 << M2M_CONTROL_PW_SHIFT)
#define M2M_CONTROL_PW_32 (2 << M2M_CONTROL_PW_SHIFT)
#define M2M_CONTROL_PW_MASK (3 << M2M_CONTROL_PW_SHIFT)
#define M2M_CONTROL_TM_SHIFT 13
#define M2M_CONTROL_TM_TX (1 << M2M_CONTROL_TM_SHIFT)
#define M2M_CONTROL_TM_RX (2 << M2M_CONTROL_TM_SHIFT)
#define M2M_CONTROL_NFBINT BIT(21)
#define M2M_CONTROL_RSS_SHIFT 22
#define M2M_CONTROL_RSS_SSPRX (1 << M2M_CONTROL_RSS_SHIFT)
#define M2M_CONTROL_RSS_SSPTX (2 << M2M_CONTROL_RSS_SHIFT)
#define M2M_CONTROL_RSS_IDE (3 << M2M_CONTROL_RSS_SHIFT)
#define M2M_CONTROL_NO_HDSK BIT(24)
#define M2M_CONTROL_PWSC_SHIFT 25
#define M2M_INTERRUPT 0x0004
#define M2M_INTERRUPT_MASK 6
#define M2M_STATUS 0x000c
#define M2M_STATUS_CTL_SHIFT 1
#define M2M_STATUS_CTL_IDLE (0 << M2M_STATUS_CTL_SHIFT)
#define M2M_STATUS_CTL_STALL (1 << M2M_STATUS_CTL_SHIFT)
#define M2M_STATUS_CTL_MEMRD (2 << M2M_STATUS_CTL_SHIFT)
#define M2M_STATUS_CTL_MEMWR (3 << M2M_STATUS_CTL_SHIFT)
#define M2M_STATUS_CTL_BWCWAIT (4 << M2M_STATUS_CTL_SHIFT)
#define M2M_STATUS_CTL_MASK (7 << M2M_STATUS_CTL_SHIFT)
#define M2M_STATUS_BUF_SHIFT 4
#define M2M_STATUS_BUF_NO (0 << M2M_STATUS_BUF_SHIFT)
#define M2M_STATUS_BUF_ON (1 << M2M_STATUS_BUF_SHIFT)
#define M2M_STATUS_BUF_NEXT (2 << M2M_STATUS_BUF_SHIFT)
#define M2M_STATUS_BUF_MASK (3 << M2M_STATUS_BUF_SHIFT)
#define M2M_STATUS_DONE BIT(6)
#define M2M_BCR0 0x0010
#define M2M_BCR1 0x0014
#define M2M_SAR_BASE0 0x0018
#define M2M_SAR_BASE1 0x001c
#define M2M_DAR_BASE0 0x002c
#define M2M_DAR_BASE1 0x0030
#define DMA_MAX_CHAN_BYTES 0xffff
#define DMA_MAX_CHAN_DESCRIPTORS 32
struct ep93xx_dma_engine;
static int ep93xx_dma_slave_config_write(struct dma_chan *chan,
enum dma_transfer_direction dir,
struct dma_slave_config *config);
/**
* struct ep93xx_dma_desc - EP93xx specific transaction descriptor
* @src_addr: source address of the transaction
* @dst_addr: destination address of the transaction
* @size: size of the transaction (in bytes)
* @complete: this descriptor is completed
* @txd: dmaengine API descriptor
* @tx_list: list of linked descriptors
* @node: link used for putting this into a channel queue
*/
struct ep93xx_dma_desc {
u32 src_addr;
u32 dst_addr;
size_t size;
bool complete;
struct dma_async_tx_descriptor txd;
struct list_head tx_list;
struct list_head node;
};
/**
* struct ep93xx_dma_chan - an EP93xx DMA M2P/M2M channel
* @chan: dmaengine API channel
* @edma: pointer to the engine device
* @regs: memory mapped registers
* @irq: interrupt number of the channel
* @clk: clock used by this channel
* @tasklet: channel specific tasklet used for callbacks
* @lock: lock protecting the fields following
* @flags: flags for the channel
* @buffer: which buffer to use next (0/1)
* @active: flattened chain of descriptors currently being processed
* @queue: pending descriptors which are handled next
* @free_list: list of free descriptors which can be used
* @runtime_addr: physical address currently used as dest/src (M2M only). This
* is set via .device_config before slave operation is
* prepared
* @runtime_ctrl: M2M runtime values for the control register.
* @slave_config: slave configuration
*
* As EP93xx DMA controller doesn't support real chained DMA descriptors we
* will have slightly different scheme here: @active points to a head of
* flattened DMA descriptor chain.
*
* @queue holds pending transactions. These are linked through the first
* descriptor in the chain. When a descriptor is moved to the @active queue,
* the first and chained descriptors are flattened into a single list.
*
* @chan.private holds pointer to &struct ep93xx_dma_data which contains
* necessary channel configuration information. For memcpy channels this must
* be %NULL.
*/
struct ep93xx_dma_chan {
struct dma_chan chan;
const struct ep93xx_dma_engine *edma;
void __iomem *regs;
int irq;
struct clk *clk;
struct tasklet_struct tasklet;
/* protects the fields following */
spinlock_t lock;
unsigned long flags;
/* Channel is configured for cyclic transfers */
#define EP93XX_DMA_IS_CYCLIC 0
int buffer;
struct list_head active;
struct list_head queue;
struct list_head free_list;
u32 runtime_addr;
u32 runtime_ctrl;
struct dma_slave_config slave_config;
};
/**
* struct ep93xx_dma_engine - the EP93xx DMA engine instance
* @dma_dev: holds the dmaengine device
* @m2m: is this an M2M or M2P device
* @hw_setup: method which sets the channel up for operation
* @hw_synchronize: synchronizes DMA channel termination to current context
* @hw_shutdown: shuts the channel down and flushes whatever is left
* @hw_submit: pushes active descriptor(s) to the hardware
* @hw_interrupt: handle the interrupt
* @num_channels: number of channels for this instance
* @channels: array of channels
*
* There is one instance of this struct for the M2P channels and one for the
* M2M channels. hw_xxx() methods are used to perform operations which are
* different on M2M and M2P channels. These methods are called with channel
* lock held and interrupts disabled so they cannot sleep.
*/
struct ep93xx_dma_engine {
struct dma_device dma_dev;
bool m2m;
int (*hw_setup)(struct ep93xx_dma_chan *);
void (*hw_synchronize)(struct ep93xx_dma_chan *);
void (*hw_shutdown)(struct ep93xx_dma_chan *);
void (*hw_submit)(struct ep93xx_dma_chan *);
int (*hw_interrupt)(struct ep93xx_dma_chan *);
#define INTERRUPT_UNKNOWN 0
#define INTERRUPT_DONE 1
#define INTERRUPT_NEXT_BUFFER 2
size_t num_channels;
struct ep93xx_dma_chan channels[];
};
static inline struct device *chan2dev(struct ep93xx_dma_chan *edmac)
{
return &edmac->chan.dev->device;
}
static struct ep93xx_dma_chan *to_ep93xx_dma_chan(struct dma_chan *chan)
{
return container_of(chan, struct ep93xx_dma_chan, chan);
}
/**
* ep93xx_dma_set_active - set new active descriptor chain
* @edmac: channel
* @desc: head of the new active descriptor chain
*
* Sets @desc to be the head of the new active descriptor chain. This is the
* chain which is processed next. The active list must be empty before calling
* this function.
*
* Called with @edmac->lock held and interrupts disabled.
*/
static void ep93xx_dma_set_active(struct ep93xx_dma_chan *edmac,
struct ep93xx_dma_desc *desc)
{
BUG_ON(!list_empty(&edmac->active));
list_add_tail(&desc->node, &edmac->active);
/* Flatten the @desc->tx_list chain into @edmac->active list */
while (!list_empty(&desc->tx_list)) {
struct ep93xx_dma_desc *d = list_first_entry(&desc->tx_list,
struct ep93xx_dma_desc, node);
/*
* We copy the callback parameters from the first descriptor
* to all the chained descriptors. This way we can call the
* callback without having to find out the first descriptor in
* the chain. Useful for cyclic transfers.
*/
d->txd.callback = desc->txd.callback;
d->txd.callback_param = desc->txd.callback_param;
list_move_tail(&d->node, &edmac->active);
}
}
/* Called with @edmac->lock held and interrupts disabled */
static struct ep93xx_dma_desc *
ep93xx_dma_get_active(struct ep93xx_dma_chan *edmac)
{
return list_first_entry_or_null(&edmac->active,
struct ep93xx_dma_desc, node);
}
/**
* ep93xx_dma_advance_active - advances to the next active descriptor
* @edmac: channel
*
* Function advances active descriptor to the next in the @edmac->active and
* returns %true if we still have descriptors in the chain to process.
* Otherwise returns %false.
*
* When the channel is in cyclic mode always returns %true.
*
* Called with @edmac->lock held and interrupts disabled.
*/
static bool ep93xx_dma_advance_active(struct ep93xx_dma_chan *edmac)
{
struct ep93xx_dma_desc *desc;
list_rotate_left(&edmac->active);
if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags))
return true;
desc = ep93xx_dma_get_active(edmac);
if (!desc)
return false;
/*
* If txd.cookie is set it means that we are back in the first
* descriptor in the chain and hence done with it.
*/
return !desc->txd.cookie;
}
/*
* M2P DMA implementation
*/
static void m2p_set_control(struct ep93xx_dma_chan *edmac, u32 control)
{
writel(control, edmac->regs + M2P_CONTROL);
/*
* EP93xx User's Guide states that we must perform a dummy read after
* write to the control register.
*/
readl(edmac->regs + M2P_CONTROL);
}
static int m2p_hw_setup(struct ep93xx_dma_chan *edmac)
{
struct ep93xx_dma_data *data = edmac->chan.private;
u32 control;
writel(data->port & 0xf, edmac->regs + M2P_PPALLOC);
control = M2P_CONTROL_CH_ERROR_INT | M2P_CONTROL_ICE
| M2P_CONTROL_ENABLE;
m2p_set_control(edmac, control);
edmac->buffer = 0;
return 0;
}
static inline u32 m2p_channel_state(struct ep93xx_dma_chan *edmac)
{
return (readl(edmac->regs + M2P_STATUS) >> 4) & 0x3;
}
static void m2p_hw_synchronize(struct ep93xx_dma_chan *edmac)
{
unsigned long flags;
u32 control;
spin_lock_irqsave(&edmac->lock, flags);
control = readl(edmac->regs + M2P_CONTROL);
control &= ~(M2P_CONTROL_STALLINT | M2P_CONTROL_NFBINT);
m2p_set_control(edmac, control);
spin_unlock_irqrestore(&edmac->lock, flags);
while (m2p_channel_state(edmac) >= M2P_STATE_ON)
schedule();
}
static void m2p_hw_shutdown(struct ep93xx_dma_chan *edmac)
{
m2p_set_control(edmac, 0);
while (m2p_channel_state(edmac) != M2P_STATE_IDLE)
dev_warn(chan2dev(edmac), "M2P: Not yet IDLE\n");
}
static void m2p_fill_desc(struct ep93xx_dma_chan *edmac)
{
struct ep93xx_dma_desc *desc;
u32 bus_addr;
desc = ep93xx_dma_get_active(edmac);
if (!desc) {
dev_warn(chan2dev(edmac), "M2P: empty descriptor list\n");
return;
}
if (ep93xx_dma_chan_direction(&edmac->chan) == DMA_MEM_TO_DEV)
bus_addr = desc->src_addr;
else
bus_addr = desc->dst_addr;
if (edmac->buffer == 0) {
writel(desc->size, edmac->regs + M2P_MAXCNT0);
writel(bus_addr, edmac->regs + M2P_BASE0);
} else {
writel(desc->size, edmac->regs + M2P_MAXCNT1);
writel(bus_addr, edmac->regs + M2P_BASE1);
}
edmac->buffer ^= 1;
}
static void m2p_hw_submit(struct ep93xx_dma_chan *edmac)
{
u32 control = readl(edmac->regs + M2P_CONTROL);
m2p_fill_desc(edmac);
control |= M2P_CONTROL_STALLINT;
if (ep93xx_dma_advance_active(edmac)) {
m2p_fill_desc(edmac);
control |= M2P_CONTROL_NFBINT;
}
m2p_set_control(edmac, control);
}
static int m2p_hw_interrupt(struct ep93xx_dma_chan *edmac)
{
u32 irq_status = readl(edmac->regs + M2P_INTERRUPT);
u32 control;
if (irq_status & M2P_INTERRUPT_ERROR) {
struct ep93xx_dma_desc *desc = ep93xx_dma_get_active(edmac);
/* Clear the error interrupt */
writel(1, edmac->regs + M2P_INTERRUPT);
/*
* It seems that there is no easy way of reporting errors back
* to client so we just report the error here and continue as
* usual.
*
* Revisit this when there is a mechanism to report back the
* errors.
*/
dev_err(chan2dev(edmac),
"DMA transfer failed! Details:\n"
"\tcookie : %d\n"
"\tsrc_addr : 0x%08x\n"
"\tdst_addr : 0x%08x\n"
"\tsize : %zu\n",
desc->txd.cookie, desc->src_addr, desc->dst_addr,
desc->size);
}
/*
* Even latest E2 silicon revision sometimes assert STALL interrupt
* instead of NFB. Therefore we treat them equally, basing on the
* amount of data we still have to transfer.
*/
if (!(irq_status & (M2P_INTERRUPT_STALL | M2P_INTERRUPT_NFB)))
return INTERRUPT_UNKNOWN;
if (ep93xx_dma_advance_active(edmac)) {
m2p_fill_desc(edmac);
return INTERRUPT_NEXT_BUFFER;
}
/* Disable interrupts */
control = readl(edmac->regs + M2P_CONTROL);
control &= ~(M2P_CONTROL_STALLINT | M2P_CONTROL_NFBINT);
m2p_set_control(edmac, control);
return INTERRUPT_DONE;
}
/*
* M2M DMA implementation
*/
static int m2m_hw_setup(struct ep93xx_dma_chan *edmac)
{
const struct ep93xx_dma_data *data = edmac->chan.private;
u32 control = 0;
if (!data) {
/* This is memcpy channel, nothing to configure */
writel(control, edmac->regs + M2M_CONTROL);
return 0;
}
switch (data->port) {
case EP93XX_DMA_SSP:
/*
* This was found via experimenting - anything less than 5
* causes the channel to perform only a partial transfer which
* leads to problems since we don't get DONE interrupt then.
*/
control = (5 << M2M_CONTROL_PWSC_SHIFT);
control |= M2M_CONTROL_NO_HDSK;
if (data->direction == DMA_MEM_TO_DEV) {
control |= M2M_CONTROL_DAH;
control |= M2M_CONTROL_TM_TX;
control |= M2M_CONTROL_RSS_SSPTX;
} else {
control |= M2M_CONTROL_SAH;
control |= M2M_CONTROL_TM_RX;
control |= M2M_CONTROL_RSS_SSPRX;
}
break;
case EP93XX_DMA_IDE:
/*
* This IDE part is totally untested. Values below are taken
* from the EP93xx Users's Guide and might not be correct.
*/
if (data->direction == DMA_MEM_TO_DEV) {
/* Worst case from the UG */
control = (3 << M2M_CONTROL_PWSC_SHIFT);
control |= M2M_CONTROL_DAH;
control |= M2M_CONTROL_TM_TX;
} else {
control = (2 << M2M_CONTROL_PWSC_SHIFT);
control |= M2M_CONTROL_SAH;
control |= M2M_CONTROL_TM_RX;
}
control |= M2M_CONTROL_NO_HDSK;
control |= M2M_CONTROL_RSS_IDE;
control |= M2M_CONTROL_PW_16;
break;
default:
return -EINVAL;
}
writel(control, edmac->regs + M2M_CONTROL);
return 0;
}
static void m2m_hw_shutdown(struct ep93xx_dma_chan *edmac)
{
/* Just disable the channel */
writel(0, edmac->regs + M2M_CONTROL);
}
static void m2m_fill_desc(struct ep93xx_dma_chan *edmac)
{
struct ep93xx_dma_desc *desc;
desc = ep93xx_dma_get_active(edmac);
if (!desc) {
dev_warn(chan2dev(edmac), "M2M: empty descriptor list\n");
return;
}
if (edmac->buffer == 0) {
writel(desc->src_addr, edmac->regs + M2M_SAR_BASE0);
writel(desc->dst_addr, edmac->regs + M2M_DAR_BASE0);
writel(desc->size, edmac->regs + M2M_BCR0);
} else {
writel(desc->src_addr, edmac->regs + M2M_SAR_BASE1);
writel(desc->dst_addr, edmac->regs + M2M_DAR_BASE1);
writel(desc->size, edmac->regs + M2M_BCR1);
}
edmac->buffer ^= 1;
}
static void m2m_hw_submit(struct ep93xx_dma_chan *edmac)
{
struct ep93xx_dma_data *data = edmac->chan.private;
u32 control = readl(edmac->regs + M2M_CONTROL);
/*
* Since we allow clients to configure PW (peripheral width) we always
* clear PW bits here and then set them according what is given in
* the runtime configuration.
*/
control &= ~M2M_CONTROL_PW_MASK;
control |= edmac->runtime_ctrl;
m2m_fill_desc(edmac);
control |= M2M_CONTROL_DONEINT;
if (ep93xx_dma_advance_active(edmac)) {
m2m_fill_desc(edmac);
control |= M2M_CONTROL_NFBINT;
}
/*
* Now we can finally enable the channel. For M2M channel this must be
* done _after_ the BCRx registers are programmed.
*/
control |= M2M_CONTROL_ENABLE;
writel(control, edmac->regs + M2M_CONTROL);
if (!data) {
/*
* For memcpy channels the software trigger must be asserted
* in order to start the memcpy operation.
*/
control |= M2M_CONTROL_START;
writel(control, edmac->regs + M2M_CONTROL);
}
}
/*
* According to EP93xx User's Guide, we should receive DONE interrupt when all
* M2M DMA controller transactions complete normally. This is not always the
* case - sometimes EP93xx M2M DMA asserts DONE interrupt when the DMA channel
* is still running (channel Buffer FSM in DMA_BUF_ON state, and channel
* Control FSM in DMA_MEM_RD state, observed at least in IDE-DMA operation).
* In effect, disabling the channel when only DONE bit is set could stop
* currently running DMA transfer. To avoid this, we use Buffer FSM and
* Control FSM to check current state of DMA channel.
*/
static int m2m_hw_interrupt(struct ep93xx_dma_chan *edmac)
{
u32 status = readl(edmac->regs + M2M_STATUS);
u32 ctl_fsm = status & M2M_STATUS_CTL_MASK;
u32 buf_fsm = status & M2M_STATUS_BUF_MASK;
bool done = status & M2M_STATUS_DONE;
bool last_done;
u32 control;
struct ep93xx_dma_desc *desc;
/* Accept only DONE and NFB interrupts */
if (!(readl(edmac->regs + M2M_INTERRUPT) & M2M_INTERRUPT_MASK))
return INTERRUPT_UNKNOWN;
if (done) {
/* Clear the DONE bit */
writel(0, edmac->regs + M2M_INTERRUPT);
}
/*
* Check whether we are done with descriptors or not. This, together
* with DMA channel state, determines action to take in interrupt.
*/
desc = ep93xx_dma_get_active(edmac);
last_done = !desc || desc->txd.cookie;
/*
* Use M2M DMA Buffer FSM and Control FSM to check current state of
* DMA channel. Using DONE and NFB bits from channel status register
* or bits from channel interrupt register is not reliable.
*/
if (!last_done &&
(buf_fsm == M2M_STATUS_BUF_NO ||
buf_fsm == M2M_STATUS_BUF_ON)) {
/*
* Two buffers are ready for update when Buffer FSM is in
* DMA_NO_BUF state. Only one buffer can be prepared without
* disabling the channel or polling the DONE bit.
* To simplify things, always prepare only one buffer.
*/
if (ep93xx_dma_advance_active(edmac)) {
m2m_fill_desc(edmac);
if (done && !edmac->chan.private) {
/* Software trigger for memcpy channel */
control = readl(edmac->regs + M2M_CONTROL);
control |= M2M_CONTROL_START;
writel(control, edmac->regs + M2M_CONTROL);
}
return INTERRUPT_NEXT_BUFFER;
} else {
last_done = true;
}
}
/*
* Disable the channel only when Buffer FSM is in DMA_NO_BUF state
* and Control FSM is in DMA_STALL state.
*/
if (last_done &&
buf_fsm == M2M_STATUS_BUF_NO &&
ctl_fsm == M2M_STATUS_CTL_STALL) {
/* Disable interrupts and the channel */
control = readl(edmac->regs + M2M_CONTROL);
control &= ~(M2M_CONTROL_DONEINT | M2M_CONTROL_NFBINT
| M2M_CONTROL_ENABLE);
writel(control, edmac->regs + M2M_CONTROL);
return INTERRUPT_DONE;
}
/*
* Nothing to do this time.
*/
return INTERRUPT_NEXT_BUFFER;
}
/*
* DMA engine API implementation
*/
static struct ep93xx_dma_desc *
ep93xx_dma_desc_get(struct ep93xx_dma_chan *edmac)
{
struct ep93xx_dma_desc *desc, *_desc;
struct ep93xx_dma_desc *ret = NULL;
unsigned long flags;
spin_lock_irqsave(&edmac->lock, flags);
list_for_each_entry_safe(desc, _desc, &edmac->free_list, node) {
if (async_tx_test_ack(&desc->txd)) {
list_del_init(&desc->node);
/* Re-initialize the descriptor */
desc->src_addr = 0;
desc->dst_addr = 0;
desc->size = 0;
desc->complete = false;
desc->txd.cookie = 0;
desc->txd.callback = NULL;
desc->txd.callback_param = NULL;
ret = desc;
break;
}
}
spin_unlock_irqrestore(&edmac->lock, flags);
return ret;
}
static void ep93xx_dma_desc_put(struct ep93xx_dma_chan *edmac,
struct ep93xx_dma_desc *desc)
{
if (desc) {
unsigned long flags;
spin_lock_irqsave(&edmac->lock, flags);
list_splice_init(&desc->tx_list, &edmac->free_list);
list_add(&desc->node, &edmac->free_list);
spin_unlock_irqrestore(&edmac->lock, flags);
}
}
/**
* ep93xx_dma_advance_work - start processing the next pending transaction
* @edmac: channel
*
* If we have pending transactions queued and we are currently idling, this
* function takes the next queued transaction from the @edmac->queue and
* pushes it to the hardware for execution.
*/
static void ep93xx_dma_advance_work(struct ep93xx_dma_chan *edmac)
{
struct ep93xx_dma_desc *new;
unsigned long flags;
spin_lock_irqsave(&edmac->lock, flags);
if (!list_empty(&edmac->active) || list_empty(&edmac->queue)) {
spin_unlock_irqrestore(&edmac->lock, flags);
return;
}
/* Take the next descriptor from the pending queue */
new = list_first_entry(&edmac->queue, struct ep93xx_dma_desc, node);
list_del_init(&new->node);
ep93xx_dma_set_active(edmac, new);
/* Push it to the hardware */
edmac->edma->hw_submit(edmac);
spin_unlock_irqrestore(&edmac->lock, flags);
}
static void ep93xx_dma_tasklet(struct tasklet_struct *t)
{
struct ep93xx_dma_chan *edmac = from_tasklet(edmac, t, tasklet);
struct ep93xx_dma_desc *desc, *d;
struct dmaengine_desc_callback cb;
LIST_HEAD(list);
memset(&cb, 0, sizeof(cb));
spin_lock_irq(&edmac->lock);
/*
* If dma_terminate_all() was called before we get to run, the active
* list has become empty. If that happens we aren't supposed to do
* anything more than call ep93xx_dma_advance_work().
*/
desc = ep93xx_dma_get_active(edmac);
if (desc) {
if (desc->complete) {
/* mark descriptor complete for non cyclic case only */
if (!test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags))
dma_cookie_complete(&desc->txd);
list_splice_init(&edmac->active, &list);
}
dmaengine_desc_get_callback(&desc->txd, &cb);
}
spin_unlock_irq(&edmac->lock);
/* Pick up the next descriptor from the queue */
ep93xx_dma_advance_work(edmac);
/* Now we can release all the chained descriptors */
list_for_each_entry_safe(desc, d, &list, node) {
dma_descriptor_unmap(&desc->txd);
ep93xx_dma_desc_put(edmac, desc);
}
dmaengine_desc_callback_invoke(&cb, NULL);
}
static irqreturn_t ep93xx_dma_interrupt(int irq, void *dev_id)
{
struct ep93xx_dma_chan *edmac = dev_id;
struct ep93xx_dma_desc *desc;
irqreturn_t ret = IRQ_HANDLED;
spin_lock(&edmac->lock);
desc = ep93xx_dma_get_active(edmac);
if (!desc) {
dev_warn(chan2dev(edmac),
"got interrupt while active list is empty\n");
spin_unlock(&edmac->lock);
return IRQ_NONE;
}
switch (edmac->edma->hw_interrupt(edmac)) {
case INTERRUPT_DONE:
desc->complete = true;
tasklet_schedule(&edmac->tasklet);
break;
case INTERRUPT_NEXT_BUFFER:
if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags))
tasklet_schedule(&edmac->tasklet);
break;
default:
dev_warn(chan2dev(edmac), "unknown interrupt!\n");
ret = IRQ_NONE;
break;
}
spin_unlock(&edmac->lock);
return ret;
}
/**
* ep93xx_dma_tx_submit - set the prepared descriptor(s) to be executed
* @tx: descriptor to be executed
*
* Function will execute given descriptor on the hardware or if the hardware
* is busy, queue the descriptor to be executed later on. Returns cookie which
* can be used to poll the status of the descriptor.
*/
static dma_cookie_t ep93xx_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(tx->chan);
struct ep93xx_dma_desc *desc;
dma_cookie_t cookie;
unsigned long flags;
spin_lock_irqsave(&edmac->lock, flags);
cookie = dma_cookie_assign(tx);
desc = container_of(tx, struct ep93xx_dma_desc, txd);
/*
* If nothing is currently prosessed, we push this descriptor
* directly to the hardware. Otherwise we put the descriptor
* to the pending queue.
*/
if (list_empty(&edmac->active)) {
ep93xx_dma_set_active(edmac, desc);
edmac->edma->hw_submit(edmac);
} else {
list_add_tail(&desc->node, &edmac->queue);
}
spin_unlock_irqrestore(&edmac->lock, flags);
return cookie;
}
/**
* ep93xx_dma_alloc_chan_resources - allocate resources for the channel
* @chan: channel to allocate resources
*
* Function allocates necessary resources for the given DMA channel and
* returns number of allocated descriptors for the channel. Negative errno
* is returned in case of failure.
*/
static int ep93xx_dma_alloc_chan_resources(struct dma_chan *chan)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
struct ep93xx_dma_data *data = chan->private;
const char *name = dma_chan_name(chan);
int ret, i;
/* Sanity check the channel parameters */
if (!edmac->edma->m2m) {
if (!data)
return -EINVAL;
if (data->port < EP93XX_DMA_I2S1 ||
data->port > EP93XX_DMA_IRDA)
return -EINVAL;
if (data->direction != ep93xx_dma_chan_direction(chan))
return -EINVAL;
} else {
if (data) {
switch (data->port) {
case EP93XX_DMA_SSP:
case EP93XX_DMA_IDE:
if (!is_slave_direction(data->direction))
return -EINVAL;
break;
default:
return -EINVAL;
}
}
}
if (data && data->name)
name = data->name;
ret = clk_prepare_enable(edmac->clk);
if (ret)
return ret;
ret = request_irq(edmac->irq, ep93xx_dma_interrupt, 0, name, edmac);
if (ret)
goto fail_clk_disable;
spin_lock_irq(&edmac->lock);
dma_cookie_init(&edmac->chan);
ret = edmac->edma->hw_setup(edmac);
spin_unlock_irq(&edmac->lock);
if (ret)
goto fail_free_irq;
for (i = 0; i < DMA_MAX_CHAN_DESCRIPTORS; i++) {
struct ep93xx_dma_desc *desc;
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc) {
dev_warn(chan2dev(edmac), "not enough descriptors\n");
break;
}
INIT_LIST_HEAD(&desc->tx_list);
dma_async_tx_descriptor_init(&desc->txd, chan);
desc->txd.flags = DMA_CTRL_ACK;
desc->txd.tx_submit = ep93xx_dma_tx_submit;
ep93xx_dma_desc_put(edmac, desc);
}
return i;
fail_free_irq:
free_irq(edmac->irq, edmac);
fail_clk_disable:
clk_disable_unprepare(edmac->clk);
return ret;
}
/**
* ep93xx_dma_free_chan_resources - release resources for the channel
* @chan: channel
*
* Function releases all the resources allocated for the given channel.
* The channel must be idle when this is called.
*/
static void ep93xx_dma_free_chan_resources(struct dma_chan *chan)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
struct ep93xx_dma_desc *desc, *d;
unsigned long flags;
LIST_HEAD(list);
BUG_ON(!list_empty(&edmac->active));
BUG_ON(!list_empty(&edmac->queue));
spin_lock_irqsave(&edmac->lock, flags);
edmac->edma->hw_shutdown(edmac);
edmac->runtime_addr = 0;
edmac->runtime_ctrl = 0;
edmac->buffer = 0;
list_splice_init(&edmac->free_list, &list);
spin_unlock_irqrestore(&edmac->lock, flags);
list_for_each_entry_safe(desc, d, &list, node)
kfree(desc);
clk_disable_unprepare(edmac->clk);
free_irq(edmac->irq, edmac);
}
/**
* ep93xx_dma_prep_dma_memcpy - prepare a memcpy DMA operation
* @chan: channel
* @dest: destination bus address
* @src: source bus address
* @len: size of the transaction
* @flags: flags for the descriptor
*
* Returns a valid DMA descriptor or %NULL in case of failure.
*/
static struct dma_async_tx_descriptor *
ep93xx_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest,
dma_addr_t src, size_t len, unsigned long flags)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
struct ep93xx_dma_desc *desc, *first;
size_t bytes, offset;
first = NULL;
for (offset = 0; offset < len; offset += bytes) {
desc = ep93xx_dma_desc_get(edmac);
if (!desc) {
dev_warn(chan2dev(edmac), "couldn't get descriptor\n");
goto fail;
}
bytes = min_t(size_t, len - offset, DMA_MAX_CHAN_BYTES);
desc->src_addr = src + offset;
desc->dst_addr = dest + offset;
desc->size = bytes;
if (!first)
first = desc;
else
list_add_tail(&desc->node, &first->tx_list);
}
first->txd.cookie = -EBUSY;
first->txd.flags = flags;
return &first->txd;
fail:
ep93xx_dma_desc_put(edmac, first);
return NULL;
}
/**
* ep93xx_dma_prep_slave_sg - prepare a slave DMA operation
* @chan: channel
* @sgl: list of buffers to transfer
* @sg_len: number of entries in @sgl
* @dir: direction of tha DMA transfer
* @flags: flags for the descriptor
* @context: operation context (ignored)
*
* Returns a valid DMA descriptor or %NULL in case of failure.
*/
static struct dma_async_tx_descriptor *
ep93xx_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
struct ep93xx_dma_desc *desc, *first;
struct scatterlist *sg;
int i;
if (!edmac->edma->m2m && dir != ep93xx_dma_chan_direction(chan)) {
dev_warn(chan2dev(edmac),
"channel was configured with different direction\n");
return NULL;
}
if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) {
dev_warn(chan2dev(edmac),
"channel is already used for cyclic transfers\n");
return NULL;
}
ep93xx_dma_slave_config_write(chan, dir, &edmac->slave_config);
first = NULL;
for_each_sg(sgl, sg, sg_len, i) {
size_t len = sg_dma_len(sg);
if (len > DMA_MAX_CHAN_BYTES) {
dev_warn(chan2dev(edmac), "too big transfer size %zu\n",
len);
goto fail;
}
desc = ep93xx_dma_desc_get(edmac);
if (!desc) {
dev_warn(chan2dev(edmac), "couldn't get descriptor\n");
goto fail;
}
if (dir == DMA_MEM_TO_DEV) {
desc->src_addr = sg_dma_address(sg);
desc->dst_addr = edmac->runtime_addr;
} else {
desc->src_addr = edmac->runtime_addr;
desc->dst_addr = sg_dma_address(sg);
}
desc->size = len;
if (!first)
first = desc;
else
list_add_tail(&desc->node, &first->tx_list);
}
first->txd.cookie = -EBUSY;
first->txd.flags = flags;
return &first->txd;
fail:
ep93xx_dma_desc_put(edmac, first);
return NULL;
}
/**
* ep93xx_dma_prep_dma_cyclic - prepare a cyclic DMA operation
* @chan: channel
* @dma_addr: DMA mapped address of the buffer
* @buf_len: length of the buffer (in bytes)
* @period_len: length of a single period
* @dir: direction of the operation
* @flags: tx descriptor status flags
*
* Prepares a descriptor for cyclic DMA operation. This means that once the
* descriptor is submitted, we will be submitting in a @period_len sized
* buffers and calling callback once the period has been elapsed. Transfer
* terminates only when client calls dmaengine_terminate_all() for this
* channel.
*
* Returns a valid DMA descriptor or %NULL in case of failure.
*/
static struct dma_async_tx_descriptor *
ep93xx_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
size_t buf_len, size_t period_len,
enum dma_transfer_direction dir, unsigned long flags)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
struct ep93xx_dma_desc *desc, *first;
size_t offset = 0;
if (!edmac->edma->m2m && dir != ep93xx_dma_chan_direction(chan)) {
dev_warn(chan2dev(edmac),
"channel was configured with different direction\n");
return NULL;
}
if (test_and_set_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) {
dev_warn(chan2dev(edmac),
"channel is already used for cyclic transfers\n");
return NULL;
}
if (period_len > DMA_MAX_CHAN_BYTES) {
dev_warn(chan2dev(edmac), "too big period length %zu\n",
period_len);
return NULL;
}
ep93xx_dma_slave_config_write(chan, dir, &edmac->slave_config);
/* Split the buffer into period size chunks */
first = NULL;
for (offset = 0; offset < buf_len; offset += period_len) {
desc = ep93xx_dma_desc_get(edmac);
if (!desc) {
dev_warn(chan2dev(edmac), "couldn't get descriptor\n");
goto fail;
}
if (dir == DMA_MEM_TO_DEV) {
desc->src_addr = dma_addr + offset;
desc->dst_addr = edmac->runtime_addr;
} else {
desc->src_addr = edmac->runtime_addr;
desc->dst_addr = dma_addr + offset;
}
desc->size = period_len;
if (!first)
first = desc;
else
list_add_tail(&desc->node, &first->tx_list);
}
first->txd.cookie = -EBUSY;
return &first->txd;
fail:
ep93xx_dma_desc_put(edmac, first);
return NULL;
}
/**
* ep93xx_dma_synchronize - Synchronizes the termination of transfers to the
* current context.
* @chan: channel
*
* Synchronizes the DMA channel termination to the current context. When this
* function returns it is guaranteed that all transfers for previously issued
* descriptors have stopped and it is safe to free the memory associated
* with them. Furthermore it is guaranteed that all complete callback functions
* for a previously submitted descriptor have finished running and it is safe to
* free resources accessed from within the complete callbacks.
*/
static void ep93xx_dma_synchronize(struct dma_chan *chan)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
if (edmac->edma->hw_synchronize)
edmac->edma->hw_synchronize(edmac);
}
/**
* ep93xx_dma_terminate_all - terminate all transactions
* @chan: channel
*
* Stops all DMA transactions. All descriptors are put back to the
* @edmac->free_list and callbacks are _not_ called.
*/
static int ep93xx_dma_terminate_all(struct dma_chan *chan)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
struct ep93xx_dma_desc *desc, *_d;
unsigned long flags;
LIST_HEAD(list);
spin_lock_irqsave(&edmac->lock, flags);
/* First we disable and flush the DMA channel */
edmac->edma->hw_shutdown(edmac);
clear_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags);
list_splice_init(&edmac->active, &list);
list_splice_init(&edmac->queue, &list);
/*
* We then re-enable the channel. This way we can continue submitting
* the descriptors by just calling ->hw_submit() again.
*/
edmac->edma->hw_setup(edmac);
spin_unlock_irqrestore(&edmac->lock, flags);
list_for_each_entry_safe(desc, _d, &list, node)
ep93xx_dma_desc_put(edmac, desc);
return 0;
}
static int ep93xx_dma_slave_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
memcpy(&edmac->slave_config, config, sizeof(*config));
return 0;
}
static int ep93xx_dma_slave_config_write(struct dma_chan *chan,
enum dma_transfer_direction dir,
struct dma_slave_config *config)
{
struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
enum dma_slave_buswidth width;
unsigned long flags;
u32 addr, ctrl;
if (!edmac->edma->m2m)
return -EINVAL;
switch (dir) {
case DMA_DEV_TO_MEM:
width = config->src_addr_width;
addr = config->src_addr;
break;
case DMA_MEM_TO_DEV:
width = config->dst_addr_width;
addr = config->dst_addr;
break;
default:
return -EINVAL;
}
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
ctrl = 0;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
ctrl = M2M_CONTROL_PW_16;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
ctrl = M2M_CONTROL_PW_32;
break;
default:
return -EINVAL;
}
spin_lock_irqsave(&edmac->lock, flags);
edmac->runtime_addr = addr;
edmac->runtime_ctrl = ctrl;
spin_unlock_irqrestore(&edmac->lock, flags);
return 0;
}
/**
* ep93xx_dma_tx_status - check if a transaction is completed
* @chan: channel
* @cookie: transaction specific cookie
* @state: state of the transaction is stored here if given
*
* This function can be used to query state of a given transaction.
*/
static enum dma_status ep93xx_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *state)
{
return dma_cookie_status(chan, cookie, state);
}
/**
* ep93xx_dma_issue_pending - push pending transactions to the hardware
* @chan: channel
*
* When this function is called, all pending transactions are pushed to the
* hardware and executed.
*/
static void ep93xx_dma_issue_pending(struct dma_chan *chan)
{
ep93xx_dma_advance_work(to_ep93xx_dma_chan(chan));
}
static int __init ep93xx_dma_probe(struct platform_device *pdev)
{
struct ep93xx_dma_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct ep93xx_dma_engine *edma;
struct dma_device *dma_dev;
int ret, i;
edma = kzalloc(struct_size(edma, channels, pdata->num_channels), GFP_KERNEL);
if (!edma)
return -ENOMEM;
dma_dev = &edma->dma_dev;
edma->m2m = platform_get_device_id(pdev)->driver_data;
edma->num_channels = pdata->num_channels;
INIT_LIST_HEAD(&dma_dev->channels);
for (i = 0; i < pdata->num_channels; i++) {
const struct ep93xx_dma_chan_data *cdata = &pdata->channels[i];
struct ep93xx_dma_chan *edmac = &edma->channels[i];
edmac->chan.device = dma_dev;
edmac->regs = cdata->base;
edmac->irq = cdata->irq;
edmac->edma = edma;
edmac->clk = clk_get(NULL, cdata->name);
if (IS_ERR(edmac->clk)) {
dev_warn(&pdev->dev, "failed to get clock for %s\n",
cdata->name);
continue;
}
spin_lock_init(&edmac->lock);
INIT_LIST_HEAD(&edmac->active);
INIT_LIST_HEAD(&edmac->queue);
INIT_LIST_HEAD(&edmac->free_list);
tasklet_setup(&edmac->tasklet, ep93xx_dma_tasklet);
list_add_tail(&edmac->chan.device_node,
&dma_dev->channels);
}
dma_cap_zero(dma_dev->cap_mask);
dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
dma_cap_set(DMA_CYCLIC, dma_dev->cap_mask);
dma_dev->dev = &pdev->dev;
dma_dev->device_alloc_chan_resources = ep93xx_dma_alloc_chan_resources;
dma_dev->device_free_chan_resources = ep93xx_dma_free_chan_resources;
dma_dev->device_prep_slave_sg = ep93xx_dma_prep_slave_sg;
dma_dev->device_prep_dma_cyclic = ep93xx_dma_prep_dma_cyclic;
dma_dev->device_config = ep93xx_dma_slave_config;
dma_dev->device_synchronize = ep93xx_dma_synchronize;
dma_dev->device_terminate_all = ep93xx_dma_terminate_all;
dma_dev->device_issue_pending = ep93xx_dma_issue_pending;
dma_dev->device_tx_status = ep93xx_dma_tx_status;
dma_set_max_seg_size(dma_dev->dev, DMA_MAX_CHAN_BYTES);
if (edma->m2m) {
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
dma_dev->device_prep_dma_memcpy = ep93xx_dma_prep_dma_memcpy;
edma->hw_setup = m2m_hw_setup;
edma->hw_shutdown = m2m_hw_shutdown;
edma->hw_submit = m2m_hw_submit;
edma->hw_interrupt = m2m_hw_interrupt;
} else {
dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
edma->hw_synchronize = m2p_hw_synchronize;
edma->hw_setup = m2p_hw_setup;
edma->hw_shutdown = m2p_hw_shutdown;
edma->hw_submit = m2p_hw_submit;
edma->hw_interrupt = m2p_hw_interrupt;
}
ret = dma_async_device_register(dma_dev);
if (unlikely(ret)) {
for (i = 0; i < edma->num_channels; i++) {
struct ep93xx_dma_chan *edmac = &edma->channels[i];
if (!IS_ERR_OR_NULL(edmac->clk))
clk_put(edmac->clk);
}
kfree(edma);
} else {
dev_info(dma_dev->dev, "EP93xx M2%s DMA ready\n",
edma->m2m ? "M" : "P");
}
return ret;
}
static const struct platform_device_id ep93xx_dma_driver_ids[] = {
{ "ep93xx-dma-m2p", 0 },
{ "ep93xx-dma-m2m", 1 },
{ },
};
static struct platform_driver ep93xx_dma_driver = {
.driver = {
.name = "ep93xx-dma",
},
.id_table = ep93xx_dma_driver_ids,
};
static int __init ep93xx_dma_module_init(void)
{
return platform_driver_probe(&ep93xx_dma_driver, ep93xx_dma_probe);
}
subsys_initcall(ep93xx_dma_module_init);
MODULE_AUTHOR("Mika Westerberg <[email protected]>");
MODULE_DESCRIPTION("EP93xx DMA driver");
| linux-master | drivers/dma/ep93xx_dma.c |
// SPDX-License-Identifier: GPL-2.0
//
// Copyright 2011 Freescale Semiconductor, Inc. All Rights Reserved.
//
// Refer to drivers/dma/imx-sdma.c
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/semaphore.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/stmp_device.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/list.h>
#include <linux/dma/mxs-dma.h>
#include <asm/irq.h>
#include "dmaengine.h"
/*
* NOTE: The term "PIO" throughout the mxs-dma implementation means
* PIO mode of mxs apbh-dma and apbx-dma. With this working mode,
* dma can program the controller registers of peripheral devices.
*/
#define dma_is_apbh(mxs_dma) ((mxs_dma)->type == MXS_DMA_APBH)
#define apbh_is_old(mxs_dma) ((mxs_dma)->dev_id == IMX23_DMA)
#define HW_APBHX_CTRL0 0x000
#define BM_APBH_CTRL0_APB_BURST8_EN (1 << 29)
#define BM_APBH_CTRL0_APB_BURST_EN (1 << 28)
#define BP_APBH_CTRL0_RESET_CHANNEL 16
#define HW_APBHX_CTRL1 0x010
#define HW_APBHX_CTRL2 0x020
#define HW_APBHX_CHANNEL_CTRL 0x030
#define BP_APBHX_CHANNEL_CTRL_RESET_CHANNEL 16
/*
* The offset of NXTCMDAR register is different per both dma type and version,
* while stride for each channel is all the same 0x70.
*/
#define HW_APBHX_CHn_NXTCMDAR(d, n) \
(((dma_is_apbh(d) && apbh_is_old(d)) ? 0x050 : 0x110) + (n) * 0x70)
#define HW_APBHX_CHn_SEMA(d, n) \
(((dma_is_apbh(d) && apbh_is_old(d)) ? 0x080 : 0x140) + (n) * 0x70)
#define HW_APBHX_CHn_BAR(d, n) \
(((dma_is_apbh(d) && apbh_is_old(d)) ? 0x070 : 0x130) + (n) * 0x70)
#define HW_APBX_CHn_DEBUG1(d, n) (0x150 + (n) * 0x70)
/*
* ccw bits definitions
*
* COMMAND: 0..1 (2)
* CHAIN: 2 (1)
* IRQ: 3 (1)
* NAND_LOCK: 4 (1) - not implemented
* NAND_WAIT4READY: 5 (1) - not implemented
* DEC_SEM: 6 (1)
* WAIT4END: 7 (1)
* HALT_ON_TERMINATE: 8 (1)
* TERMINATE_FLUSH: 9 (1)
* RESERVED: 10..11 (2)
* PIO_NUM: 12..15 (4)
*/
#define BP_CCW_COMMAND 0
#define BM_CCW_COMMAND (3 << 0)
#define CCW_CHAIN (1 << 2)
#define CCW_IRQ (1 << 3)
#define CCW_WAIT4RDY (1 << 5)
#define CCW_DEC_SEM (1 << 6)
#define CCW_WAIT4END (1 << 7)
#define CCW_HALT_ON_TERM (1 << 8)
#define CCW_TERM_FLUSH (1 << 9)
#define BP_CCW_PIO_NUM 12
#define BM_CCW_PIO_NUM (0xf << 12)
#define BF_CCW(value, field) (((value) << BP_CCW_##field) & BM_CCW_##field)
#define MXS_DMA_CMD_NO_XFER 0
#define MXS_DMA_CMD_WRITE 1
#define MXS_DMA_CMD_READ 2
#define MXS_DMA_CMD_DMA_SENSE 3 /* not implemented */
struct mxs_dma_ccw {
u32 next;
u16 bits;
u16 xfer_bytes;
#define MAX_XFER_BYTES 0xff00
u32 bufaddr;
#define MXS_PIO_WORDS 16
u32 pio_words[MXS_PIO_WORDS];
};
#define CCW_BLOCK_SIZE (4 * PAGE_SIZE)
#define NUM_CCW (int)(CCW_BLOCK_SIZE / sizeof(struct mxs_dma_ccw))
struct mxs_dma_chan {
struct mxs_dma_engine *mxs_dma;
struct dma_chan chan;
struct dma_async_tx_descriptor desc;
struct tasklet_struct tasklet;
unsigned int chan_irq;
struct mxs_dma_ccw *ccw;
dma_addr_t ccw_phys;
int desc_count;
enum dma_status status;
unsigned int flags;
bool reset;
#define MXS_DMA_SG_LOOP (1 << 0)
#define MXS_DMA_USE_SEMAPHORE (1 << 1)
};
#define MXS_DMA_CHANNELS 16
#define MXS_DMA_CHANNELS_MASK 0xffff
enum mxs_dma_devtype {
MXS_DMA_APBH,
MXS_DMA_APBX,
};
enum mxs_dma_id {
IMX23_DMA,
IMX28_DMA,
};
struct mxs_dma_engine {
enum mxs_dma_id dev_id;
enum mxs_dma_devtype type;
void __iomem *base;
struct clk *clk;
struct dma_device dma_device;
struct mxs_dma_chan mxs_chans[MXS_DMA_CHANNELS];
struct platform_device *pdev;
unsigned int nr_channels;
};
struct mxs_dma_type {
enum mxs_dma_id id;
enum mxs_dma_devtype type;
};
static struct mxs_dma_type mxs_dma_types[] = {
{
.id = IMX23_DMA,
.type = MXS_DMA_APBH,
}, {
.id = IMX23_DMA,
.type = MXS_DMA_APBX,
}, {
.id = IMX28_DMA,
.type = MXS_DMA_APBH,
}, {
.id = IMX28_DMA,
.type = MXS_DMA_APBX,
}
};
static const struct of_device_id mxs_dma_dt_ids[] = {
{ .compatible = "fsl,imx23-dma-apbh", .data = &mxs_dma_types[0], },
{ .compatible = "fsl,imx23-dma-apbx", .data = &mxs_dma_types[1], },
{ .compatible = "fsl,imx28-dma-apbh", .data = &mxs_dma_types[2], },
{ .compatible = "fsl,imx28-dma-apbx", .data = &mxs_dma_types[3], },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_dma_dt_ids);
static struct mxs_dma_chan *to_mxs_dma_chan(struct dma_chan *chan)
{
return container_of(chan, struct mxs_dma_chan, chan);
}
static void mxs_dma_reset_chan(struct dma_chan *chan)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
int chan_id = mxs_chan->chan.chan_id;
/*
* mxs dma channel resets can cause a channel stall. To recover from a
* channel stall, we have to reset the whole DMA engine. To avoid this,
* we use cyclic DMA with semaphores, that are enhanced in
* mxs_dma_int_handler. To reset the channel, we can simply stop writing
* into the semaphore counter.
*/
if (mxs_chan->flags & MXS_DMA_USE_SEMAPHORE &&
mxs_chan->flags & MXS_DMA_SG_LOOP) {
mxs_chan->reset = true;
} else if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma)) {
writel(1 << (chan_id + BP_APBH_CTRL0_RESET_CHANNEL),
mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET);
} else {
unsigned long elapsed = 0;
const unsigned long max_wait = 50000; /* 50ms */
void __iomem *reg_dbg1 = mxs_dma->base +
HW_APBX_CHn_DEBUG1(mxs_dma, chan_id);
/*
* On i.MX28 APBX, the DMA channel can stop working if we reset
* the channel while it is in READ_FLUSH (0x08) state.
* We wait here until we leave the state. Then we trigger the
* reset. Waiting a maximum of 50ms, the kernel shouldn't crash
* because of this.
*/
while ((readl(reg_dbg1) & 0xf) == 0x8 && elapsed < max_wait) {
udelay(100);
elapsed += 100;
}
if (elapsed >= max_wait)
dev_err(&mxs_chan->mxs_dma->pdev->dev,
"Failed waiting for the DMA channel %d to leave state READ_FLUSH, trying to reset channel in READ_FLUSH state now\n",
chan_id);
writel(1 << (chan_id + BP_APBHX_CHANNEL_CTRL_RESET_CHANNEL),
mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_SET);
}
mxs_chan->status = DMA_COMPLETE;
}
static void mxs_dma_enable_chan(struct dma_chan *chan)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
int chan_id = mxs_chan->chan.chan_id;
/* set cmd_addr up */
writel(mxs_chan->ccw_phys,
mxs_dma->base + HW_APBHX_CHn_NXTCMDAR(mxs_dma, chan_id));
/* write 1 to SEMA to kick off the channel */
if (mxs_chan->flags & MXS_DMA_USE_SEMAPHORE &&
mxs_chan->flags & MXS_DMA_SG_LOOP) {
/* A cyclic DMA consists of at least 2 segments, so initialize
* the semaphore with 2 so we have enough time to add 1 to the
* semaphore if we need to */
writel(2, mxs_dma->base + HW_APBHX_CHn_SEMA(mxs_dma, chan_id));
} else {
writel(1, mxs_dma->base + HW_APBHX_CHn_SEMA(mxs_dma, chan_id));
}
mxs_chan->reset = false;
}
static void mxs_dma_disable_chan(struct dma_chan *chan)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
mxs_chan->status = DMA_COMPLETE;
}
static int mxs_dma_pause_chan(struct dma_chan *chan)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
int chan_id = mxs_chan->chan.chan_id;
/* freeze the channel */
if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma))
writel(1 << chan_id,
mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET);
else
writel(1 << chan_id,
mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_SET);
mxs_chan->status = DMA_PAUSED;
return 0;
}
static int mxs_dma_resume_chan(struct dma_chan *chan)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
int chan_id = mxs_chan->chan.chan_id;
/* unfreeze the channel */
if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma))
writel(1 << chan_id,
mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_CLR);
else
writel(1 << chan_id,
mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_CLR);
mxs_chan->status = DMA_IN_PROGRESS;
return 0;
}
static dma_cookie_t mxs_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
return dma_cookie_assign(tx);
}
static void mxs_dma_tasklet(struct tasklet_struct *t)
{
struct mxs_dma_chan *mxs_chan = from_tasklet(mxs_chan, t, tasklet);
dmaengine_desc_get_callback_invoke(&mxs_chan->desc, NULL);
}
static int mxs_dma_irq_to_chan(struct mxs_dma_engine *mxs_dma, int irq)
{
int i;
for (i = 0; i != mxs_dma->nr_channels; ++i)
if (mxs_dma->mxs_chans[i].chan_irq == irq)
return i;
return -EINVAL;
}
static irqreturn_t mxs_dma_int_handler(int irq, void *dev_id)
{
struct mxs_dma_engine *mxs_dma = dev_id;
struct mxs_dma_chan *mxs_chan;
u32 completed;
u32 err;
int chan = mxs_dma_irq_to_chan(mxs_dma, irq);
if (chan < 0)
return IRQ_NONE;
/* completion status */
completed = readl(mxs_dma->base + HW_APBHX_CTRL1);
completed = (completed >> chan) & 0x1;
/* Clear interrupt */
writel((1 << chan),
mxs_dma->base + HW_APBHX_CTRL1 + STMP_OFFSET_REG_CLR);
/* error status */
err = readl(mxs_dma->base + HW_APBHX_CTRL2);
err &= (1 << (MXS_DMA_CHANNELS + chan)) | (1 << chan);
/*
* error status bit is in the upper 16 bits, error irq bit in the lower
* 16 bits. We transform it into a simpler error code:
* err: 0x00 = no error, 0x01 = TERMINATION, 0x02 = BUS_ERROR
*/
err = (err >> (MXS_DMA_CHANNELS + chan)) + (err >> chan);
/* Clear error irq */
writel((1 << chan),
mxs_dma->base + HW_APBHX_CTRL2 + STMP_OFFSET_REG_CLR);
/*
* When both completion and error of termination bits set at the
* same time, we do not take it as an error. IOW, it only becomes
* an error we need to handle here in case of either it's a bus
* error or a termination error with no completion. 0x01 is termination
* error, so we can subtract err & completed to get the real error case.
*/
err -= err & completed;
mxs_chan = &mxs_dma->mxs_chans[chan];
if (err) {
dev_dbg(mxs_dma->dma_device.dev,
"%s: error in channel %d\n", __func__,
chan);
mxs_chan->status = DMA_ERROR;
mxs_dma_reset_chan(&mxs_chan->chan);
} else if (mxs_chan->status != DMA_COMPLETE) {
if (mxs_chan->flags & MXS_DMA_SG_LOOP) {
mxs_chan->status = DMA_IN_PROGRESS;
if (mxs_chan->flags & MXS_DMA_USE_SEMAPHORE)
writel(1, mxs_dma->base +
HW_APBHX_CHn_SEMA(mxs_dma, chan));
} else {
mxs_chan->status = DMA_COMPLETE;
}
}
if (mxs_chan->status == DMA_COMPLETE) {
if (mxs_chan->reset)
return IRQ_HANDLED;
dma_cookie_complete(&mxs_chan->desc);
}
/* schedule tasklet on this channel */
tasklet_schedule(&mxs_chan->tasklet);
return IRQ_HANDLED;
}
static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
int ret;
mxs_chan->ccw = dma_alloc_coherent(mxs_dma->dma_device.dev,
CCW_BLOCK_SIZE,
&mxs_chan->ccw_phys, GFP_KERNEL);
if (!mxs_chan->ccw) {
ret = -ENOMEM;
goto err_alloc;
}
ret = request_irq(mxs_chan->chan_irq, mxs_dma_int_handler,
0, "mxs-dma", mxs_dma);
if (ret)
goto err_irq;
ret = clk_prepare_enable(mxs_dma->clk);
if (ret)
goto err_clk;
mxs_dma_reset_chan(chan);
dma_async_tx_descriptor_init(&mxs_chan->desc, chan);
mxs_chan->desc.tx_submit = mxs_dma_tx_submit;
/* the descriptor is ready */
async_tx_ack(&mxs_chan->desc);
return 0;
err_clk:
free_irq(mxs_chan->chan_irq, mxs_dma);
err_irq:
dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE,
mxs_chan->ccw, mxs_chan->ccw_phys);
err_alloc:
return ret;
}
static void mxs_dma_free_chan_resources(struct dma_chan *chan)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
mxs_dma_disable_chan(chan);
free_irq(mxs_chan->chan_irq, mxs_dma);
dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE,
mxs_chan->ccw, mxs_chan->ccw_phys);
clk_disable_unprepare(mxs_dma->clk);
}
/*
* How to use the flags for ->device_prep_slave_sg() :
* [1] If there is only one DMA command in the DMA chain, the code should be:
* ......
* ->device_prep_slave_sg(DMA_CTRL_ACK);
* ......
* [2] If there are two DMA commands in the DMA chain, the code should be
* ......
* ->device_prep_slave_sg(0);
* ......
* ->device_prep_slave_sg(DMA_CTRL_ACK);
* ......
* [3] If there are more than two DMA commands in the DMA chain, the code
* should be:
* ......
* ->device_prep_slave_sg(0); // First
* ......
* ->device_prep_slave_sg(DMA_CTRL_ACK]);
* ......
* ->device_prep_slave_sg(DMA_CTRL_ACK); // Last
* ......
*/
static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
struct mxs_dma_ccw *ccw;
struct scatterlist *sg;
u32 i, j;
u32 *pio;
int idx = 0;
if (mxs_chan->status == DMA_IN_PROGRESS)
idx = mxs_chan->desc_count;
if (sg_len + idx > NUM_CCW) {
dev_err(mxs_dma->dma_device.dev,
"maximum number of sg exceeded: %d > %d\n",
sg_len, NUM_CCW);
goto err_out;
}
mxs_chan->status = DMA_IN_PROGRESS;
mxs_chan->flags = 0;
/*
* If the sg is prepared with append flag set, the sg
* will be appended to the last prepared sg.
*/
if (idx) {
BUG_ON(idx < 1);
ccw = &mxs_chan->ccw[idx - 1];
ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * idx;
ccw->bits |= CCW_CHAIN;
ccw->bits &= ~CCW_IRQ;
ccw->bits &= ~CCW_DEC_SEM;
} else {
idx = 0;
}
if (direction == DMA_TRANS_NONE) {
ccw = &mxs_chan->ccw[idx++];
pio = (u32 *) sgl;
for (j = 0; j < sg_len;)
ccw->pio_words[j++] = *pio++;
ccw->bits = 0;
ccw->bits |= CCW_IRQ;
ccw->bits |= CCW_DEC_SEM;
if (flags & MXS_DMA_CTRL_WAIT4END)
ccw->bits |= CCW_WAIT4END;
ccw->bits |= CCW_HALT_ON_TERM;
ccw->bits |= CCW_TERM_FLUSH;
ccw->bits |= BF_CCW(sg_len, PIO_NUM);
ccw->bits |= BF_CCW(MXS_DMA_CMD_NO_XFER, COMMAND);
if (flags & MXS_DMA_CTRL_WAIT4RDY)
ccw->bits |= CCW_WAIT4RDY;
} else {
for_each_sg(sgl, sg, sg_len, i) {
if (sg_dma_len(sg) > MAX_XFER_BYTES) {
dev_err(mxs_dma->dma_device.dev, "maximum bytes for sg entry exceeded: %d > %d\n",
sg_dma_len(sg), MAX_XFER_BYTES);
goto err_out;
}
ccw = &mxs_chan->ccw[idx++];
ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * idx;
ccw->bufaddr = sg->dma_address;
ccw->xfer_bytes = sg_dma_len(sg);
ccw->bits = 0;
ccw->bits |= CCW_CHAIN;
ccw->bits |= CCW_HALT_ON_TERM;
ccw->bits |= CCW_TERM_FLUSH;
ccw->bits |= BF_CCW(direction == DMA_DEV_TO_MEM ?
MXS_DMA_CMD_WRITE : MXS_DMA_CMD_READ,
COMMAND);
if (i + 1 == sg_len) {
ccw->bits &= ~CCW_CHAIN;
ccw->bits |= CCW_IRQ;
ccw->bits |= CCW_DEC_SEM;
if (flags & MXS_DMA_CTRL_WAIT4END)
ccw->bits |= CCW_WAIT4END;
}
}
}
mxs_chan->desc_count = idx;
return &mxs_chan->desc;
err_out:
mxs_chan->status = DMA_ERROR;
return NULL;
}
static struct dma_async_tx_descriptor *mxs_dma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
u32 num_periods = buf_len / period_len;
u32 i = 0, buf = 0;
if (mxs_chan->status == DMA_IN_PROGRESS)
return NULL;
mxs_chan->status = DMA_IN_PROGRESS;
mxs_chan->flags |= MXS_DMA_SG_LOOP;
mxs_chan->flags |= MXS_DMA_USE_SEMAPHORE;
if (num_periods > NUM_CCW) {
dev_err(mxs_dma->dma_device.dev,
"maximum number of sg exceeded: %d > %d\n",
num_periods, NUM_CCW);
goto err_out;
}
if (period_len > MAX_XFER_BYTES) {
dev_err(mxs_dma->dma_device.dev,
"maximum period size exceeded: %zu > %d\n",
period_len, MAX_XFER_BYTES);
goto err_out;
}
while (buf < buf_len) {
struct mxs_dma_ccw *ccw = &mxs_chan->ccw[i];
if (i + 1 == num_periods)
ccw->next = mxs_chan->ccw_phys;
else
ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * (i + 1);
ccw->bufaddr = dma_addr;
ccw->xfer_bytes = period_len;
ccw->bits = 0;
ccw->bits |= CCW_CHAIN;
ccw->bits |= CCW_IRQ;
ccw->bits |= CCW_HALT_ON_TERM;
ccw->bits |= CCW_TERM_FLUSH;
ccw->bits |= CCW_DEC_SEM;
ccw->bits |= BF_CCW(direction == DMA_DEV_TO_MEM ?
MXS_DMA_CMD_WRITE : MXS_DMA_CMD_READ, COMMAND);
dma_addr += period_len;
buf += period_len;
i++;
}
mxs_chan->desc_count = i;
return &mxs_chan->desc;
err_out:
mxs_chan->status = DMA_ERROR;
return NULL;
}
static int mxs_dma_terminate_all(struct dma_chan *chan)
{
mxs_dma_reset_chan(chan);
mxs_dma_disable_chan(chan);
return 0;
}
static enum dma_status mxs_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
u32 residue = 0;
if (mxs_chan->status == DMA_IN_PROGRESS &&
mxs_chan->flags & MXS_DMA_SG_LOOP) {
struct mxs_dma_ccw *last_ccw;
u32 bar;
last_ccw = &mxs_chan->ccw[mxs_chan->desc_count - 1];
residue = last_ccw->xfer_bytes + last_ccw->bufaddr;
bar = readl(mxs_dma->base +
HW_APBHX_CHn_BAR(mxs_dma, chan->chan_id));
residue -= bar;
}
dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie,
residue);
return mxs_chan->status;
}
static int mxs_dma_init(struct mxs_dma_engine *mxs_dma)
{
int ret;
ret = clk_prepare_enable(mxs_dma->clk);
if (ret)
return ret;
ret = stmp_reset_block(mxs_dma->base);
if (ret)
goto err_out;
/* enable apbh burst */
if (dma_is_apbh(mxs_dma)) {
writel(BM_APBH_CTRL0_APB_BURST_EN,
mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET);
writel(BM_APBH_CTRL0_APB_BURST8_EN,
mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET);
}
/* enable irq for all the channels */
writel(MXS_DMA_CHANNELS_MASK << MXS_DMA_CHANNELS,
mxs_dma->base + HW_APBHX_CTRL1 + STMP_OFFSET_REG_SET);
err_out:
clk_disable_unprepare(mxs_dma->clk);
return ret;
}
struct mxs_dma_filter_param {
unsigned int chan_id;
};
static bool mxs_dma_filter_fn(struct dma_chan *chan, void *fn_param)
{
struct mxs_dma_filter_param *param = fn_param;
struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan);
struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
int chan_irq;
if (chan->chan_id != param->chan_id)
return false;
chan_irq = platform_get_irq(mxs_dma->pdev, param->chan_id);
if (chan_irq < 0)
return false;
mxs_chan->chan_irq = chan_irq;
return true;
}
static struct dma_chan *mxs_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct mxs_dma_engine *mxs_dma = ofdma->of_dma_data;
dma_cap_mask_t mask = mxs_dma->dma_device.cap_mask;
struct mxs_dma_filter_param param;
if (dma_spec->args_count != 1)
return NULL;
param.chan_id = dma_spec->args[0];
if (param.chan_id >= mxs_dma->nr_channels)
return NULL;
return __dma_request_channel(&mask, mxs_dma_filter_fn, ¶m,
ofdma->of_node);
}
static int mxs_dma_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
const struct mxs_dma_type *dma_type;
struct mxs_dma_engine *mxs_dma;
int ret, i;
mxs_dma = devm_kzalloc(&pdev->dev, sizeof(*mxs_dma), GFP_KERNEL);
if (!mxs_dma)
return -ENOMEM;
ret = of_property_read_u32(np, "dma-channels", &mxs_dma->nr_channels);
if (ret) {
dev_err(&pdev->dev, "failed to read dma-channels\n");
return ret;
}
dma_type = (struct mxs_dma_type *)of_device_get_match_data(&pdev->dev);
mxs_dma->type = dma_type->type;
mxs_dma->dev_id = dma_type->id;
mxs_dma->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mxs_dma->base))
return PTR_ERR(mxs_dma->base);
mxs_dma->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(mxs_dma->clk))
return PTR_ERR(mxs_dma->clk);
dma_cap_set(DMA_SLAVE, mxs_dma->dma_device.cap_mask);
dma_cap_set(DMA_CYCLIC, mxs_dma->dma_device.cap_mask);
INIT_LIST_HEAD(&mxs_dma->dma_device.channels);
/* Initialize channel parameters */
for (i = 0; i < MXS_DMA_CHANNELS; i++) {
struct mxs_dma_chan *mxs_chan = &mxs_dma->mxs_chans[i];
mxs_chan->mxs_dma = mxs_dma;
mxs_chan->chan.device = &mxs_dma->dma_device;
dma_cookie_init(&mxs_chan->chan);
tasklet_setup(&mxs_chan->tasklet, mxs_dma_tasklet);
/* Add the channel to mxs_chan list */
list_add_tail(&mxs_chan->chan.device_node,
&mxs_dma->dma_device.channels);
}
ret = mxs_dma_init(mxs_dma);
if (ret)
return ret;
mxs_dma->pdev = pdev;
mxs_dma->dma_device.dev = &pdev->dev;
/* mxs_dma gets 65535 bytes maximum sg size */
dma_set_max_seg_size(mxs_dma->dma_device.dev, MAX_XFER_BYTES);
mxs_dma->dma_device.device_alloc_chan_resources = mxs_dma_alloc_chan_resources;
mxs_dma->dma_device.device_free_chan_resources = mxs_dma_free_chan_resources;
mxs_dma->dma_device.device_tx_status = mxs_dma_tx_status;
mxs_dma->dma_device.device_prep_slave_sg = mxs_dma_prep_slave_sg;
mxs_dma->dma_device.device_prep_dma_cyclic = mxs_dma_prep_dma_cyclic;
mxs_dma->dma_device.device_pause = mxs_dma_pause_chan;
mxs_dma->dma_device.device_resume = mxs_dma_resume_chan;
mxs_dma->dma_device.device_terminate_all = mxs_dma_terminate_all;
mxs_dma->dma_device.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
mxs_dma->dma_device.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
mxs_dma->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
mxs_dma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
mxs_dma->dma_device.device_issue_pending = mxs_dma_enable_chan;
ret = dmaenginem_async_device_register(&mxs_dma->dma_device);
if (ret) {
dev_err(mxs_dma->dma_device.dev, "unable to register\n");
return ret;
}
ret = of_dma_controller_register(np, mxs_dma_xlate, mxs_dma);
if (ret) {
dev_err(mxs_dma->dma_device.dev,
"failed to register controller\n");
}
dev_info(mxs_dma->dma_device.dev, "initialized\n");
return 0;
}
static struct platform_driver mxs_dma_driver = {
.driver = {
.name = "mxs-dma",
.of_match_table = mxs_dma_dt_ids,
},
.probe = mxs_dma_probe,
};
builtin_platform_driver(mxs_dma_driver);
| linux-master | drivers/dma/mxs-dma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2015-2016 Marvell International Ltd.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include "dmaengine.h"
/* DMA Engine Registers */
#define MV_XOR_V2_DMA_DESQ_BALR_OFF 0x000
#define MV_XOR_V2_DMA_DESQ_BAHR_OFF 0x004
#define MV_XOR_V2_DMA_DESQ_SIZE_OFF 0x008
#define MV_XOR_V2_DMA_DESQ_DONE_OFF 0x00C
#define MV_XOR_V2_DMA_DESQ_DONE_PENDING_MASK 0x7FFF
#define MV_XOR_V2_DMA_DESQ_DONE_PENDING_SHIFT 0
#define MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_MASK 0x1FFF
#define MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_SHIFT 16
#define MV_XOR_V2_DMA_DESQ_ARATTR_OFF 0x010
#define MV_XOR_V2_DMA_DESQ_ATTR_CACHE_MASK 0x3F3F
#define MV_XOR_V2_DMA_DESQ_ATTR_OUTER_SHAREABLE 0x202
#define MV_XOR_V2_DMA_DESQ_ATTR_CACHEABLE 0x3C3C
#define MV_XOR_V2_DMA_IMSG_CDAT_OFF 0x014
#define MV_XOR_V2_DMA_IMSG_THRD_OFF 0x018
#define MV_XOR_V2_DMA_IMSG_THRD_MASK 0x7FFF
#define MV_XOR_V2_DMA_IMSG_TIMER_EN BIT(18)
#define MV_XOR_V2_DMA_DESQ_AWATTR_OFF 0x01C
/* Same flags as MV_XOR_V2_DMA_DESQ_ARATTR_OFF */
#define MV_XOR_V2_DMA_DESQ_ALLOC_OFF 0x04C
#define MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_MASK 0xFFFF
#define MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_SHIFT 16
#define MV_XOR_V2_DMA_IMSG_BALR_OFF 0x050
#define MV_XOR_V2_DMA_IMSG_BAHR_OFF 0x054
#define MV_XOR_V2_DMA_DESQ_CTRL_OFF 0x100
#define MV_XOR_V2_DMA_DESQ_CTRL_32B 1
#define MV_XOR_V2_DMA_DESQ_CTRL_128B 7
#define MV_XOR_V2_DMA_DESQ_STOP_OFF 0x800
#define MV_XOR_V2_DMA_DESQ_DEALLOC_OFF 0x804
#define MV_XOR_V2_DMA_DESQ_ADD_OFF 0x808
#define MV_XOR_V2_DMA_IMSG_TMOT 0x810
#define MV_XOR_V2_DMA_IMSG_TIMER_THRD_MASK 0x1FFF
/* XOR Global registers */
#define MV_XOR_V2_GLOB_BW_CTRL 0x4
#define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_SHIFT 0
#define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_VAL 64
#define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_SHIFT 8
#define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_VAL 8
#define MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_SHIFT 12
#define MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_VAL 4
#define MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_SHIFT 16
#define MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_VAL 4
#define MV_XOR_V2_GLOB_PAUSE 0x014
#define MV_XOR_V2_GLOB_PAUSE_AXI_TIME_DIS_VAL 0x8
#define MV_XOR_V2_GLOB_SYS_INT_CAUSE 0x200
#define MV_XOR_V2_GLOB_SYS_INT_MASK 0x204
#define MV_XOR_V2_GLOB_MEM_INT_CAUSE 0x220
#define MV_XOR_V2_GLOB_MEM_INT_MASK 0x224
#define MV_XOR_V2_MIN_DESC_SIZE 32
#define MV_XOR_V2_EXT_DESC_SIZE 128
#define MV_XOR_V2_DESC_RESERVED_SIZE 12
#define MV_XOR_V2_DESC_BUFF_D_ADDR_SIZE 12
#define MV_XOR_V2_CMD_LINE_NUM_MAX_D_BUF 8
/*
* Descriptors queue size. With 32 bytes descriptors, up to 2^14
* descriptors are allowed, with 128 bytes descriptors, up to 2^12
* descriptors are allowed. This driver uses 128 bytes descriptors,
* but experimentation has shown that a set of 1024 descriptors is
* sufficient to reach a good level of performance.
*/
#define MV_XOR_V2_DESC_NUM 1024
/*
* Threshold values for descriptors and timeout, determined by
* experimentation as giving a good level of performance.
*/
#define MV_XOR_V2_DONE_IMSG_THRD 0x14
#define MV_XOR_V2_TIMER_THRD 0xB0
/**
* struct mv_xor_v2_descriptor - DMA HW descriptor
* @desc_id: used by S/W and is not affected by H/W.
* @flags: error and status flags
* @crc32_result: CRC32 calculation result
* @desc_ctrl: operation mode and control flags
* @buff_size: amount of bytes to be processed
* @fill_pattern_src_addr: Fill-Pattern or Source-Address and
* AW-Attributes
* @data_buff_addr: Source (and might be RAID6 destination)
* addresses of data buffers in RAID5 and RAID6
* @reserved: reserved
*/
struct mv_xor_v2_descriptor {
u16 desc_id;
u16 flags;
u32 crc32_result;
u32 desc_ctrl;
/* Definitions for desc_ctrl */
#define DESC_NUM_ACTIVE_D_BUF_SHIFT 22
#define DESC_OP_MODE_SHIFT 28
#define DESC_OP_MODE_NOP 0 /* Idle operation */
#define DESC_OP_MODE_MEMCPY 1 /* Pure-DMA operation */
#define DESC_OP_MODE_MEMSET 2 /* Mem-Fill operation */
#define DESC_OP_MODE_MEMINIT 3 /* Mem-Init operation */
#define DESC_OP_MODE_MEM_COMPARE 4 /* Mem-Compare operation */
#define DESC_OP_MODE_CRC32 5 /* CRC32 calculation */
#define DESC_OP_MODE_XOR 6 /* RAID5 (XOR) operation */
#define DESC_OP_MODE_RAID6 7 /* RAID6 P&Q-generation */
#define DESC_OP_MODE_RAID6_REC 8 /* RAID6 Recovery */
#define DESC_Q_BUFFER_ENABLE BIT(16)
#define DESC_P_BUFFER_ENABLE BIT(17)
#define DESC_IOD BIT(27)
u32 buff_size;
u32 fill_pattern_src_addr[4];
u32 data_buff_addr[MV_XOR_V2_DESC_BUFF_D_ADDR_SIZE];
u32 reserved[MV_XOR_V2_DESC_RESERVED_SIZE];
};
/**
* struct mv_xor_v2_device - implements a xor device
* @lock: lock for the engine
* @clk: reference to the 'core' clock
* @reg_clk: reference to the 'reg' clock
* @dma_base: memory mapped DMA register base
* @glob_base: memory mapped global register base
* @irq_tasklet: tasklet used for IRQ handling call-backs
* @free_sw_desc: linked list of free SW descriptors
* @dmadev: dma device
* @dmachan: dma channel
* @hw_desq: HW descriptors queue
* @hw_desq_virt: virtual address of DESCQ
* @sw_desq: SW descriptors queue
* @desc_size: HW descriptor size
* @npendings: number of pending descriptors (for which tx_submit has
* @hw_queue_idx: HW queue index
* @irq: The Linux interrupt number
* been called, but not yet issue_pending)
*/
struct mv_xor_v2_device {
spinlock_t lock;
void __iomem *dma_base;
void __iomem *glob_base;
struct clk *clk;
struct clk *reg_clk;
struct tasklet_struct irq_tasklet;
struct list_head free_sw_desc;
struct dma_device dmadev;
struct dma_chan dmachan;
dma_addr_t hw_desq;
struct mv_xor_v2_descriptor *hw_desq_virt;
struct mv_xor_v2_sw_desc *sw_desq;
int desc_size;
unsigned int npendings;
unsigned int hw_queue_idx;
unsigned int irq;
};
/**
* struct mv_xor_v2_sw_desc - implements a xor SW descriptor
* @idx: descriptor index
* @async_tx: support for the async_tx api
* @hw_desc: assosiated HW descriptor
* @free_list: node of the free SW descriprots list
*/
struct mv_xor_v2_sw_desc {
int idx;
struct dma_async_tx_descriptor async_tx;
struct mv_xor_v2_descriptor hw_desc;
struct list_head free_list;
};
/*
* Fill the data buffers to a HW descriptor
*/
static void mv_xor_v2_set_data_buffers(struct mv_xor_v2_device *xor_dev,
struct mv_xor_v2_descriptor *desc,
dma_addr_t src, int index)
{
int arr_index = ((index >> 1) * 3);
/*
* Fill the buffer's addresses to the descriptor.
*
* The format of the buffers address for 2 sequential buffers
* X and X + 1:
*
* First word: Buffer-DX-Address-Low[31:0]
* Second word: Buffer-DX+1-Address-Low[31:0]
* Third word: DX+1-Buffer-Address-High[47:32] [31:16]
* DX-Buffer-Address-High[47:32] [15:0]
*/
if ((index & 0x1) == 0) {
desc->data_buff_addr[arr_index] = lower_32_bits(src);
desc->data_buff_addr[arr_index + 2] &= ~0xFFFF;
desc->data_buff_addr[arr_index + 2] |=
upper_32_bits(src) & 0xFFFF;
} else {
desc->data_buff_addr[arr_index + 1] =
lower_32_bits(src);
desc->data_buff_addr[arr_index + 2] &= ~0xFFFF0000;
desc->data_buff_addr[arr_index + 2] |=
(upper_32_bits(src) & 0xFFFF) << 16;
}
}
/*
* notify the engine of new descriptors, and update the available index.
*/
static void mv_xor_v2_add_desc_to_desq(struct mv_xor_v2_device *xor_dev,
int num_of_desc)
{
/* write the number of new descriptors in the DESQ. */
writel(num_of_desc, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ADD_OFF);
}
/*
* free HW descriptors
*/
static void mv_xor_v2_free_desc_from_desq(struct mv_xor_v2_device *xor_dev,
int num_of_desc)
{
/* write the number of new descriptors in the DESQ. */
writel(num_of_desc, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_DEALLOC_OFF);
}
/*
* Set descriptor size
* Return the HW descriptor size in bytes
*/
static int mv_xor_v2_set_desc_size(struct mv_xor_v2_device *xor_dev)
{
writel(MV_XOR_V2_DMA_DESQ_CTRL_128B,
xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_CTRL_OFF);
return MV_XOR_V2_EXT_DESC_SIZE;
}
/*
* Set the IMSG threshold
*/
static inline
void mv_xor_v2_enable_imsg_thrd(struct mv_xor_v2_device *xor_dev)
{
u32 reg;
/* Configure threshold of number of descriptors, and enable timer */
reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF);
reg &= ~MV_XOR_V2_DMA_IMSG_THRD_MASK;
reg |= MV_XOR_V2_DONE_IMSG_THRD;
reg |= MV_XOR_V2_DMA_IMSG_TIMER_EN;
writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF);
/* Configure Timer Threshold */
reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_TMOT);
reg &= ~MV_XOR_V2_DMA_IMSG_TIMER_THRD_MASK;
reg |= MV_XOR_V2_TIMER_THRD;
writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_TMOT);
}
static irqreturn_t mv_xor_v2_interrupt_handler(int irq, void *data)
{
struct mv_xor_v2_device *xor_dev = data;
unsigned int ndescs;
u32 reg;
reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_DONE_OFF);
ndescs = ((reg >> MV_XOR_V2_DMA_DESQ_DONE_PENDING_SHIFT) &
MV_XOR_V2_DMA_DESQ_DONE_PENDING_MASK);
/* No descriptors to process */
if (!ndescs)
return IRQ_NONE;
/* schedule a tasklet to handle descriptors callbacks */
tasklet_schedule(&xor_dev->irq_tasklet);
return IRQ_HANDLED;
}
/*
* submit a descriptor to the DMA engine
*/
static dma_cookie_t
mv_xor_v2_tx_submit(struct dma_async_tx_descriptor *tx)
{
void *dest_hw_desc;
dma_cookie_t cookie;
struct mv_xor_v2_sw_desc *sw_desc =
container_of(tx, struct mv_xor_v2_sw_desc, async_tx);
struct mv_xor_v2_device *xor_dev =
container_of(tx->chan, struct mv_xor_v2_device, dmachan);
dev_dbg(xor_dev->dmadev.dev,
"%s sw_desc %p: async_tx %p\n",
__func__, sw_desc, &sw_desc->async_tx);
/* assign cookie */
spin_lock_bh(&xor_dev->lock);
cookie = dma_cookie_assign(tx);
/* copy the HW descriptor from the SW descriptor to the DESQ */
dest_hw_desc = xor_dev->hw_desq_virt + xor_dev->hw_queue_idx;
memcpy(dest_hw_desc, &sw_desc->hw_desc, xor_dev->desc_size);
xor_dev->npendings++;
xor_dev->hw_queue_idx++;
if (xor_dev->hw_queue_idx >= MV_XOR_V2_DESC_NUM)
xor_dev->hw_queue_idx = 0;
spin_unlock_bh(&xor_dev->lock);
return cookie;
}
/*
* Prepare a SW descriptor
*/
static struct mv_xor_v2_sw_desc *
mv_xor_v2_prep_sw_desc(struct mv_xor_v2_device *xor_dev)
{
struct mv_xor_v2_sw_desc *sw_desc;
bool found = false;
/* Lock the channel */
spin_lock_bh(&xor_dev->lock);
if (list_empty(&xor_dev->free_sw_desc)) {
spin_unlock_bh(&xor_dev->lock);
/* schedule tasklet to free some descriptors */
tasklet_schedule(&xor_dev->irq_tasklet);
return NULL;
}
list_for_each_entry(sw_desc, &xor_dev->free_sw_desc, free_list) {
if (async_tx_test_ack(&sw_desc->async_tx)) {
found = true;
break;
}
}
if (!found) {
spin_unlock_bh(&xor_dev->lock);
return NULL;
}
list_del(&sw_desc->free_list);
/* Release the channel */
spin_unlock_bh(&xor_dev->lock);
return sw_desc;
}
/*
* Prepare a HW descriptor for a memcpy operation
*/
static struct dma_async_tx_descriptor *
mv_xor_v2_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest,
dma_addr_t src, size_t len, unsigned long flags)
{
struct mv_xor_v2_sw_desc *sw_desc;
struct mv_xor_v2_descriptor *hw_descriptor;
struct mv_xor_v2_device *xor_dev;
xor_dev = container_of(chan, struct mv_xor_v2_device, dmachan);
dev_dbg(xor_dev->dmadev.dev,
"%s len: %zu src %pad dest %pad flags: %ld\n",
__func__, len, &src, &dest, flags);
sw_desc = mv_xor_v2_prep_sw_desc(xor_dev);
if (!sw_desc)
return NULL;
sw_desc->async_tx.flags = flags;
/* set the HW descriptor */
hw_descriptor = &sw_desc->hw_desc;
/* save the SW descriptor ID to restore when operation is done */
hw_descriptor->desc_id = sw_desc->idx;
/* Set the MEMCPY control word */
hw_descriptor->desc_ctrl =
DESC_OP_MODE_MEMCPY << DESC_OP_MODE_SHIFT;
if (flags & DMA_PREP_INTERRUPT)
hw_descriptor->desc_ctrl |= DESC_IOD;
/* Set source address */
hw_descriptor->fill_pattern_src_addr[0] = lower_32_bits(src);
hw_descriptor->fill_pattern_src_addr[1] =
upper_32_bits(src) & 0xFFFF;
/* Set Destination address */
hw_descriptor->fill_pattern_src_addr[2] = lower_32_bits(dest);
hw_descriptor->fill_pattern_src_addr[3] =
upper_32_bits(dest) & 0xFFFF;
/* Set buffers size */
hw_descriptor->buff_size = len;
/* return the async tx descriptor */
return &sw_desc->async_tx;
}
/*
* Prepare a HW descriptor for a XOR operation
*/
static struct dma_async_tx_descriptor *
mv_xor_v2_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
unsigned int src_cnt, size_t len, unsigned long flags)
{
struct mv_xor_v2_sw_desc *sw_desc;
struct mv_xor_v2_descriptor *hw_descriptor;
struct mv_xor_v2_device *xor_dev =
container_of(chan, struct mv_xor_v2_device, dmachan);
int i;
if (src_cnt > MV_XOR_V2_CMD_LINE_NUM_MAX_D_BUF || src_cnt < 1)
return NULL;
dev_dbg(xor_dev->dmadev.dev,
"%s src_cnt: %d len: %zu dest %pad flags: %ld\n",
__func__, src_cnt, len, &dest, flags);
sw_desc = mv_xor_v2_prep_sw_desc(xor_dev);
if (!sw_desc)
return NULL;
sw_desc->async_tx.flags = flags;
/* set the HW descriptor */
hw_descriptor = &sw_desc->hw_desc;
/* save the SW descriptor ID to restore when operation is done */
hw_descriptor->desc_id = sw_desc->idx;
/* Set the XOR control word */
hw_descriptor->desc_ctrl =
DESC_OP_MODE_XOR << DESC_OP_MODE_SHIFT;
hw_descriptor->desc_ctrl |= DESC_P_BUFFER_ENABLE;
if (flags & DMA_PREP_INTERRUPT)
hw_descriptor->desc_ctrl |= DESC_IOD;
/* Set the data buffers */
for (i = 0; i < src_cnt; i++)
mv_xor_v2_set_data_buffers(xor_dev, hw_descriptor, src[i], i);
hw_descriptor->desc_ctrl |=
src_cnt << DESC_NUM_ACTIVE_D_BUF_SHIFT;
/* Set Destination address */
hw_descriptor->fill_pattern_src_addr[2] = lower_32_bits(dest);
hw_descriptor->fill_pattern_src_addr[3] =
upper_32_bits(dest) & 0xFFFF;
/* Set buffers size */
hw_descriptor->buff_size = len;
/* return the async tx descriptor */
return &sw_desc->async_tx;
}
/*
* Prepare a HW descriptor for interrupt operation.
*/
static struct dma_async_tx_descriptor *
mv_xor_v2_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
{
struct mv_xor_v2_sw_desc *sw_desc;
struct mv_xor_v2_descriptor *hw_descriptor;
struct mv_xor_v2_device *xor_dev =
container_of(chan, struct mv_xor_v2_device, dmachan);
sw_desc = mv_xor_v2_prep_sw_desc(xor_dev);
if (!sw_desc)
return NULL;
/* set the HW descriptor */
hw_descriptor = &sw_desc->hw_desc;
/* save the SW descriptor ID to restore when operation is done */
hw_descriptor->desc_id = sw_desc->idx;
/* Set the INTERRUPT control word */
hw_descriptor->desc_ctrl =
DESC_OP_MODE_NOP << DESC_OP_MODE_SHIFT;
hw_descriptor->desc_ctrl |= DESC_IOD;
/* return the async tx descriptor */
return &sw_desc->async_tx;
}
/*
* push pending transactions to hardware
*/
static void mv_xor_v2_issue_pending(struct dma_chan *chan)
{
struct mv_xor_v2_device *xor_dev =
container_of(chan, struct mv_xor_v2_device, dmachan);
spin_lock_bh(&xor_dev->lock);
/*
* update the engine with the number of descriptors to
* process
*/
mv_xor_v2_add_desc_to_desq(xor_dev, xor_dev->npendings);
xor_dev->npendings = 0;
spin_unlock_bh(&xor_dev->lock);
}
static inline
int mv_xor_v2_get_pending_params(struct mv_xor_v2_device *xor_dev,
int *pending_ptr)
{
u32 reg;
reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_DONE_OFF);
/* get the next pending descriptor index */
*pending_ptr = ((reg >> MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_SHIFT) &
MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_MASK);
/* get the number of descriptors pending handle */
return ((reg >> MV_XOR_V2_DMA_DESQ_DONE_PENDING_SHIFT) &
MV_XOR_V2_DMA_DESQ_DONE_PENDING_MASK);
}
/*
* handle the descriptors after HW process
*/
static void mv_xor_v2_tasklet(struct tasklet_struct *t)
{
struct mv_xor_v2_device *xor_dev = from_tasklet(xor_dev, t,
irq_tasklet);
int pending_ptr, num_of_pending, i;
struct mv_xor_v2_sw_desc *next_pending_sw_desc = NULL;
dev_dbg(xor_dev->dmadev.dev, "%s %d\n", __func__, __LINE__);
/* get the pending descriptors parameters */
num_of_pending = mv_xor_v2_get_pending_params(xor_dev, &pending_ptr);
/* loop over free descriptors */
for (i = 0; i < num_of_pending; i++) {
struct mv_xor_v2_descriptor *next_pending_hw_desc =
xor_dev->hw_desq_virt + pending_ptr;
/* get the SW descriptor related to the HW descriptor */
next_pending_sw_desc =
&xor_dev->sw_desq[next_pending_hw_desc->desc_id];
/* call the callback */
if (next_pending_sw_desc->async_tx.cookie > 0) {
/*
* update the channel's completed cookie - no
* lock is required the IMSG threshold provide
* the locking
*/
dma_cookie_complete(&next_pending_sw_desc->async_tx);
dma_descriptor_unmap(&next_pending_sw_desc->async_tx);
dmaengine_desc_get_callback_invoke(
&next_pending_sw_desc->async_tx, NULL);
}
dma_run_dependencies(&next_pending_sw_desc->async_tx);
/* Lock the channel */
spin_lock(&xor_dev->lock);
/* add the SW descriptor to the free descriptors list */
list_add(&next_pending_sw_desc->free_list,
&xor_dev->free_sw_desc);
/* Release the channel */
spin_unlock(&xor_dev->lock);
/* increment the next descriptor */
pending_ptr++;
if (pending_ptr >= MV_XOR_V2_DESC_NUM)
pending_ptr = 0;
}
if (num_of_pending != 0) {
/* free the descriptores */
mv_xor_v2_free_desc_from_desq(xor_dev, num_of_pending);
}
}
/*
* Set DMA Interrupt-message (IMSG) parameters
*/
static void mv_xor_v2_set_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
{
struct mv_xor_v2_device *xor_dev = dev_get_drvdata(desc->dev);
writel(msg->address_lo,
xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_BALR_OFF);
writel(msg->address_hi & 0xFFFF,
xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_BAHR_OFF);
writel(msg->data,
xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_CDAT_OFF);
}
static int mv_xor_v2_descq_init(struct mv_xor_v2_device *xor_dev)
{
u32 reg;
/* write the DESQ size to the DMA engine */
writel(MV_XOR_V2_DESC_NUM,
xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_SIZE_OFF);
/* write the DESQ address to the DMA enngine*/
writel(lower_32_bits(xor_dev->hw_desq),
xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_BALR_OFF);
writel(upper_32_bits(xor_dev->hw_desq),
xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_BAHR_OFF);
/*
* This is a temporary solution, until we activate the
* SMMU. Set the attributes for reading & writing data buffers
* & descriptors to:
*
* - OuterShareable - Snoops will be performed on CPU caches
* - Enable cacheable - Bufferable, Modifiable, Other Allocate
* and Allocate
*/
reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ARATTR_OFF);
reg &= ~MV_XOR_V2_DMA_DESQ_ATTR_CACHE_MASK;
reg |= MV_XOR_V2_DMA_DESQ_ATTR_OUTER_SHAREABLE |
MV_XOR_V2_DMA_DESQ_ATTR_CACHEABLE;
writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ARATTR_OFF);
reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_AWATTR_OFF);
reg &= ~MV_XOR_V2_DMA_DESQ_ATTR_CACHE_MASK;
reg |= MV_XOR_V2_DMA_DESQ_ATTR_OUTER_SHAREABLE |
MV_XOR_V2_DMA_DESQ_ATTR_CACHEABLE;
writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_AWATTR_OFF);
/* BW CTRL - set values to optimize the XOR performance:
*
* - Set WrBurstLen & RdBurstLen - the unit will issue
* maximum of 256B write/read transactions.
* - Limit the number of outstanding write & read data
* (OBB/IBB) requests to the maximal value.
*/
reg = ((MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_VAL <<
MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_SHIFT) |
(MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_VAL <<
MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_SHIFT) |
(MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_VAL <<
MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_SHIFT) |
(MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_VAL <<
MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_SHIFT));
writel(reg, xor_dev->glob_base + MV_XOR_V2_GLOB_BW_CTRL);
/* Disable the AXI timer feature */
reg = readl(xor_dev->glob_base + MV_XOR_V2_GLOB_PAUSE);
reg |= MV_XOR_V2_GLOB_PAUSE_AXI_TIME_DIS_VAL;
writel(reg, xor_dev->glob_base + MV_XOR_V2_GLOB_PAUSE);
/* enable the DMA engine */
writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
return 0;
}
static int mv_xor_v2_suspend(struct platform_device *dev, pm_message_t state)
{
struct mv_xor_v2_device *xor_dev = platform_get_drvdata(dev);
/* Set this bit to disable to stop the XOR unit. */
writel(0x1, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
return 0;
}
static int mv_xor_v2_resume(struct platform_device *dev)
{
struct mv_xor_v2_device *xor_dev = platform_get_drvdata(dev);
mv_xor_v2_set_desc_size(xor_dev);
mv_xor_v2_enable_imsg_thrd(xor_dev);
mv_xor_v2_descq_init(xor_dev);
return 0;
}
static int mv_xor_v2_probe(struct platform_device *pdev)
{
struct mv_xor_v2_device *xor_dev;
int i, ret = 0;
struct dma_device *dma_dev;
struct mv_xor_v2_sw_desc *sw_desc;
BUILD_BUG_ON(sizeof(struct mv_xor_v2_descriptor) !=
MV_XOR_V2_EXT_DESC_SIZE);
xor_dev = devm_kzalloc(&pdev->dev, sizeof(*xor_dev), GFP_KERNEL);
if (!xor_dev)
return -ENOMEM;
xor_dev->dma_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(xor_dev->dma_base))
return PTR_ERR(xor_dev->dma_base);
xor_dev->glob_base = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(xor_dev->glob_base))
return PTR_ERR(xor_dev->glob_base);
platform_set_drvdata(pdev, xor_dev);
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40));
if (ret)
return ret;
xor_dev->reg_clk = devm_clk_get_optional_enabled(&pdev->dev, "reg");
if (IS_ERR(xor_dev->reg_clk))
return PTR_ERR(xor_dev->reg_clk);
xor_dev->clk = devm_clk_get_enabled(&pdev->dev, NULL);
if (IS_ERR(xor_dev->clk))
return PTR_ERR(xor_dev->clk);
ret = platform_msi_domain_alloc_irqs(&pdev->dev, 1,
mv_xor_v2_set_msi_msg);
if (ret)
return ret;
xor_dev->irq = msi_get_virq(&pdev->dev, 0);
ret = devm_request_irq(&pdev->dev, xor_dev->irq,
mv_xor_v2_interrupt_handler, 0,
dev_name(&pdev->dev), xor_dev);
if (ret)
goto free_msi_irqs;
tasklet_setup(&xor_dev->irq_tasklet, mv_xor_v2_tasklet);
xor_dev->desc_size = mv_xor_v2_set_desc_size(xor_dev);
dma_cookie_init(&xor_dev->dmachan);
/*
* allocate coherent memory for hardware descriptors
* note: writecombine gives slightly better performance, but
* requires that we explicitly flush the writes
*/
xor_dev->hw_desq_virt =
dma_alloc_coherent(&pdev->dev,
xor_dev->desc_size * MV_XOR_V2_DESC_NUM,
&xor_dev->hw_desq, GFP_KERNEL);
if (!xor_dev->hw_desq_virt) {
ret = -ENOMEM;
goto free_msi_irqs;
}
/* alloc memory for the SW descriptors */
xor_dev->sw_desq = devm_kcalloc(&pdev->dev,
MV_XOR_V2_DESC_NUM, sizeof(*sw_desc),
GFP_KERNEL);
if (!xor_dev->sw_desq) {
ret = -ENOMEM;
goto free_hw_desq;
}
spin_lock_init(&xor_dev->lock);
/* init the free SW descriptors list */
INIT_LIST_HEAD(&xor_dev->free_sw_desc);
/* add all SW descriptors to the free list */
for (i = 0; i < MV_XOR_V2_DESC_NUM; i++) {
struct mv_xor_v2_sw_desc *sw_desc =
xor_dev->sw_desq + i;
sw_desc->idx = i;
dma_async_tx_descriptor_init(&sw_desc->async_tx,
&xor_dev->dmachan);
sw_desc->async_tx.tx_submit = mv_xor_v2_tx_submit;
async_tx_ack(&sw_desc->async_tx);
list_add(&sw_desc->free_list,
&xor_dev->free_sw_desc);
}
dma_dev = &xor_dev->dmadev;
/* set DMA capabilities */
dma_cap_zero(dma_dev->cap_mask);
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
dma_cap_set(DMA_XOR, dma_dev->cap_mask);
dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask);
/* init dma link list */
INIT_LIST_HEAD(&dma_dev->channels);
/* set base routines */
dma_dev->device_tx_status = dma_cookie_status;
dma_dev->device_issue_pending = mv_xor_v2_issue_pending;
dma_dev->dev = &pdev->dev;
dma_dev->device_prep_dma_memcpy = mv_xor_v2_prep_dma_memcpy;
dma_dev->device_prep_dma_interrupt = mv_xor_v2_prep_dma_interrupt;
dma_dev->max_xor = 8;
dma_dev->device_prep_dma_xor = mv_xor_v2_prep_dma_xor;
xor_dev->dmachan.device = dma_dev;
list_add_tail(&xor_dev->dmachan.device_node,
&dma_dev->channels);
mv_xor_v2_enable_imsg_thrd(xor_dev);
mv_xor_v2_descq_init(xor_dev);
ret = dma_async_device_register(dma_dev);
if (ret)
goto free_hw_desq;
dev_notice(&pdev->dev, "Marvell Version 2 XOR driver\n");
return 0;
free_hw_desq:
dma_free_coherent(&pdev->dev,
xor_dev->desc_size * MV_XOR_V2_DESC_NUM,
xor_dev->hw_desq_virt, xor_dev->hw_desq);
free_msi_irqs:
platform_msi_domain_free_irqs(&pdev->dev);
return ret;
}
static int mv_xor_v2_remove(struct platform_device *pdev)
{
struct mv_xor_v2_device *xor_dev = platform_get_drvdata(pdev);
dma_async_device_unregister(&xor_dev->dmadev);
dma_free_coherent(&pdev->dev,
xor_dev->desc_size * MV_XOR_V2_DESC_NUM,
xor_dev->hw_desq_virt, xor_dev->hw_desq);
devm_free_irq(&pdev->dev, xor_dev->irq, xor_dev);
platform_msi_domain_free_irqs(&pdev->dev);
tasklet_kill(&xor_dev->irq_tasklet);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id mv_xor_v2_dt_ids[] = {
{ .compatible = "marvell,xor-v2", },
{},
};
MODULE_DEVICE_TABLE(of, mv_xor_v2_dt_ids);
#endif
static struct platform_driver mv_xor_v2_driver = {
.probe = mv_xor_v2_probe,
.suspend = mv_xor_v2_suspend,
.resume = mv_xor_v2_resume,
.remove = mv_xor_v2_remove,
.driver = {
.name = "mv_xor_v2",
.of_match_table = of_match_ptr(mv_xor_v2_dt_ids),
},
};
module_platform_driver(mv_xor_v2_driver);
MODULE_DESCRIPTION("DMA engine driver for Marvell's Version 2 of XOR engine");
| linux-master | drivers/dma/mv_xor_v2.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) Ericsson AB 2007-2008
* Copyright (C) ST-Ericsson SA 2008-2010
* Author: Per Forlin <[email protected]> for ST-Ericsson
* Author: Jonas Aaberg <[email protected]> for ST-Ericsson
*/
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/dmaengine.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_dma.h>
#include <linux/amba/bus.h>
#include <linux/regulator/consumer.h>
#include "dmaengine.h"
#include "ste_dma40.h"
#include "ste_dma40_ll.h"
/**
* struct stedma40_platform_data - Configuration struct for the dma device.
*
* @dev_tx: mapping between destination event line and io address
* @dev_rx: mapping between source event line and io address
* @disabled_channels: A vector, ending with -1, that marks physical channels
* that are for different reasons not available for the driver.
* @soft_lli_chans: A vector, that marks physical channels will use LLI by SW
* which avoids HW bug that exists in some versions of the controller.
* SoftLLI introduces relink overhead that could impact performace for
* certain use cases.
* @num_of_soft_lli_chans: The number of channels that needs to be configured
* to use SoftLLI.
* @use_esram_lcla: flag for mapping the lcla into esram region
* @num_of_memcpy_chans: The number of channels reserved for memcpy.
* @num_of_phy_chans: The number of physical channels implemented in HW.
* 0 means reading the number of channels from DMA HW but this is only valid
* for 'multiple of 4' channels, like 8.
*/
struct stedma40_platform_data {
int disabled_channels[STEDMA40_MAX_PHYS];
int *soft_lli_chans;
int num_of_soft_lli_chans;
bool use_esram_lcla;
int num_of_memcpy_chans;
int num_of_phy_chans;
};
#define D40_NAME "dma40"
#define D40_PHY_CHAN -1
/* For masking out/in 2 bit channel positions */
#define D40_CHAN_POS(chan) (2 * (chan / 2))
#define D40_CHAN_POS_MASK(chan) (0x3 << D40_CHAN_POS(chan))
/* Maximum iterations taken before giving up suspending a channel */
#define D40_SUSPEND_MAX_IT 500
/* Milliseconds */
#define DMA40_AUTOSUSPEND_DELAY 100
/* Hardware requirement on LCLA alignment */
#define LCLA_ALIGNMENT 0x40000
/* Max number of links per event group */
#define D40_LCLA_LINK_PER_EVENT_GRP 128
#define D40_LCLA_END D40_LCLA_LINK_PER_EVENT_GRP
/* Max number of logical channels per physical channel */
#define D40_MAX_LOG_CHAN_PER_PHY 32
/* Attempts before giving up to trying to get pages that are aligned */
#define MAX_LCLA_ALLOC_ATTEMPTS 256
/* Bit markings for allocation map */
#define D40_ALLOC_FREE BIT(31)
#define D40_ALLOC_PHY BIT(30)
#define D40_ALLOC_LOG_FREE 0
#define D40_MEMCPY_MAX_CHANS 8
/* Reserved event lines for memcpy only. */
#define DB8500_DMA_MEMCPY_EV_0 51
#define DB8500_DMA_MEMCPY_EV_1 56
#define DB8500_DMA_MEMCPY_EV_2 57
#define DB8500_DMA_MEMCPY_EV_3 58
#define DB8500_DMA_MEMCPY_EV_4 59
#define DB8500_DMA_MEMCPY_EV_5 60
static int dma40_memcpy_channels[] = {
DB8500_DMA_MEMCPY_EV_0,
DB8500_DMA_MEMCPY_EV_1,
DB8500_DMA_MEMCPY_EV_2,
DB8500_DMA_MEMCPY_EV_3,
DB8500_DMA_MEMCPY_EV_4,
DB8500_DMA_MEMCPY_EV_5,
};
/* Default configuration for physical memcpy */
static const struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
.mode = STEDMA40_MODE_PHYSICAL,
.dir = DMA_MEM_TO_MEM,
.src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.src_info.psize = STEDMA40_PSIZE_PHY_1,
.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
.dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.dst_info.psize = STEDMA40_PSIZE_PHY_1,
.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
};
/* Default configuration for logical memcpy */
static const struct stedma40_chan_cfg dma40_memcpy_conf_log = {
.mode = STEDMA40_MODE_LOGICAL,
.dir = DMA_MEM_TO_MEM,
.src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.src_info.psize = STEDMA40_PSIZE_LOG_1,
.src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
.dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
.dst_info.psize = STEDMA40_PSIZE_LOG_1,
.dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
};
/**
* enum d40_command - The different commands and/or statuses.
*
* @D40_DMA_STOP: DMA channel command STOP or status STOPPED,
* @D40_DMA_RUN: The DMA channel is RUNNING of the command RUN.
* @D40_DMA_SUSPEND_REQ: Request the DMA to SUSPEND as soon as possible.
* @D40_DMA_SUSPENDED: The DMA channel is SUSPENDED.
*/
enum d40_command {
D40_DMA_STOP = 0,
D40_DMA_RUN = 1,
D40_DMA_SUSPEND_REQ = 2,
D40_DMA_SUSPENDED = 3
};
/*
* enum d40_events - The different Event Enables for the event lines.
*
* @D40_DEACTIVATE_EVENTLINE: De-activate Event line, stopping the logical chan.
* @D40_ACTIVATE_EVENTLINE: Activate the Event line, to start a logical chan.
* @D40_SUSPEND_REQ_EVENTLINE: Requesting for suspending a event line.
* @D40_ROUND_EVENTLINE: Status check for event line.
*/
enum d40_events {
D40_DEACTIVATE_EVENTLINE = 0,
D40_ACTIVATE_EVENTLINE = 1,
D40_SUSPEND_REQ_EVENTLINE = 2,
D40_ROUND_EVENTLINE = 3
};
/*
* These are the registers that has to be saved and later restored
* when the DMA hw is powered off.
* TODO: Add save/restore of D40_DREG_GCC on dma40 v3 or later, if that works.
*/
static __maybe_unused u32 d40_backup_regs[] = {
D40_DREG_LCPA,
D40_DREG_LCLA,
D40_DREG_PRMSE,
D40_DREG_PRMSO,
D40_DREG_PRMOE,
D40_DREG_PRMOO,
};
#define BACKUP_REGS_SZ ARRAY_SIZE(d40_backup_regs)
/*
* since 9540 and 8540 has the same HW revision
* use v4a for 9540 or ealier
* use v4b for 8540 or later
* HW revision:
* DB8500ed has revision 0
* DB8500v1 has revision 2
* DB8500v2 has revision 3
* AP9540v1 has revision 4
* DB8540v1 has revision 4
* TODO: Check if all these registers have to be saved/restored on dma40 v4a
*/
static u32 d40_backup_regs_v4a[] = {
D40_DREG_PSEG1,
D40_DREG_PSEG2,
D40_DREG_PSEG3,
D40_DREG_PSEG4,
D40_DREG_PCEG1,
D40_DREG_PCEG2,
D40_DREG_PCEG3,
D40_DREG_PCEG4,
D40_DREG_RSEG1,
D40_DREG_RSEG2,
D40_DREG_RSEG3,
D40_DREG_RSEG4,
D40_DREG_RCEG1,
D40_DREG_RCEG2,
D40_DREG_RCEG3,
D40_DREG_RCEG4,
};
#define BACKUP_REGS_SZ_V4A ARRAY_SIZE(d40_backup_regs_v4a)
static u32 d40_backup_regs_v4b[] = {
D40_DREG_CPSEG1,
D40_DREG_CPSEG2,
D40_DREG_CPSEG3,
D40_DREG_CPSEG4,
D40_DREG_CPSEG5,
D40_DREG_CPCEG1,
D40_DREG_CPCEG2,
D40_DREG_CPCEG3,
D40_DREG_CPCEG4,
D40_DREG_CPCEG5,
D40_DREG_CRSEG1,
D40_DREG_CRSEG2,
D40_DREG_CRSEG3,
D40_DREG_CRSEG4,
D40_DREG_CRSEG5,
D40_DREG_CRCEG1,
D40_DREG_CRCEG2,
D40_DREG_CRCEG3,
D40_DREG_CRCEG4,
D40_DREG_CRCEG5,
};
#define BACKUP_REGS_SZ_V4B ARRAY_SIZE(d40_backup_regs_v4b)
static __maybe_unused u32 d40_backup_regs_chan[] = {
D40_CHAN_REG_SSCFG,
D40_CHAN_REG_SSELT,
D40_CHAN_REG_SSPTR,
D40_CHAN_REG_SSLNK,
D40_CHAN_REG_SDCFG,
D40_CHAN_REG_SDELT,
D40_CHAN_REG_SDPTR,
D40_CHAN_REG_SDLNK,
};
#define BACKUP_REGS_SZ_MAX ((BACKUP_REGS_SZ_V4A > BACKUP_REGS_SZ_V4B) ? \
BACKUP_REGS_SZ_V4A : BACKUP_REGS_SZ_V4B)
/**
* struct d40_interrupt_lookup - lookup table for interrupt handler
*
* @src: Interrupt mask register.
* @clr: Interrupt clear register.
* @is_error: true if this is an error interrupt.
* @offset: start delta in the lookup_log_chans in d40_base. If equals to
* D40_PHY_CHAN, the lookup_phy_chans shall be used instead.
*/
struct d40_interrupt_lookup {
u32 src;
u32 clr;
bool is_error;
int offset;
};
static struct d40_interrupt_lookup il_v4a[] = {
{D40_DREG_LCTIS0, D40_DREG_LCICR0, false, 0},
{D40_DREG_LCTIS1, D40_DREG_LCICR1, false, 32},
{D40_DREG_LCTIS2, D40_DREG_LCICR2, false, 64},
{D40_DREG_LCTIS3, D40_DREG_LCICR3, false, 96},
{D40_DREG_LCEIS0, D40_DREG_LCICR0, true, 0},
{D40_DREG_LCEIS1, D40_DREG_LCICR1, true, 32},
{D40_DREG_LCEIS2, D40_DREG_LCICR2, true, 64},
{D40_DREG_LCEIS3, D40_DREG_LCICR3, true, 96},
{D40_DREG_PCTIS, D40_DREG_PCICR, false, D40_PHY_CHAN},
{D40_DREG_PCEIS, D40_DREG_PCICR, true, D40_PHY_CHAN},
};
static struct d40_interrupt_lookup il_v4b[] = {
{D40_DREG_CLCTIS1, D40_DREG_CLCICR1, false, 0},
{D40_DREG_CLCTIS2, D40_DREG_CLCICR2, false, 32},
{D40_DREG_CLCTIS3, D40_DREG_CLCICR3, false, 64},
{D40_DREG_CLCTIS4, D40_DREG_CLCICR4, false, 96},
{D40_DREG_CLCTIS5, D40_DREG_CLCICR5, false, 128},
{D40_DREG_CLCEIS1, D40_DREG_CLCICR1, true, 0},
{D40_DREG_CLCEIS2, D40_DREG_CLCICR2, true, 32},
{D40_DREG_CLCEIS3, D40_DREG_CLCICR3, true, 64},
{D40_DREG_CLCEIS4, D40_DREG_CLCICR4, true, 96},
{D40_DREG_CLCEIS5, D40_DREG_CLCICR5, true, 128},
{D40_DREG_CPCTIS, D40_DREG_CPCICR, false, D40_PHY_CHAN},
{D40_DREG_CPCEIS, D40_DREG_CPCICR, true, D40_PHY_CHAN},
};
/**
* struct d40_reg_val - simple lookup struct
*
* @reg: The register.
* @val: The value that belongs to the register in reg.
*/
struct d40_reg_val {
unsigned int reg;
unsigned int val;
};
static __initdata struct d40_reg_val dma_init_reg_v4a[] = {
/* Clock every part of the DMA block from start */
{ .reg = D40_DREG_GCC, .val = D40_DREG_GCC_ENABLE_ALL},
/* Interrupts on all logical channels */
{ .reg = D40_DREG_LCMIS0, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCMIS1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCMIS2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCMIS3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCICR0, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCICR1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCICR2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCICR3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCTIS0, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCTIS1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCTIS2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_LCTIS3, .val = 0xFFFFFFFF}
};
static __initdata struct d40_reg_val dma_init_reg_v4b[] = {
/* Clock every part of the DMA block from start */
{ .reg = D40_DREG_GCC, .val = D40_DREG_GCC_ENABLE_ALL},
/* Interrupts on all logical channels */
{ .reg = D40_DREG_CLCMIS1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCMIS2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCMIS3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCMIS4, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCMIS5, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR4, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCICR5, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS1, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS2, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS3, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS4, .val = 0xFFFFFFFF},
{ .reg = D40_DREG_CLCTIS5, .val = 0xFFFFFFFF}
};
/**
* struct d40_lli_pool - Structure for keeping LLIs in memory
*
* @base: Pointer to memory area when the pre_alloc_lli's are not large
* enough, IE bigger than the most common case, 1 dst and 1 src. NULL if
* pre_alloc_lli is used.
* @dma_addr: DMA address, if mapped
* @size: The size in bytes of the memory at base or the size of pre_alloc_lli.
* @pre_alloc_lli: Pre allocated area for the most common case of transfers,
* one buffer to one buffer.
*/
struct d40_lli_pool {
void *base;
int size;
dma_addr_t dma_addr;
/* Space for dst and src, plus an extra for padding */
u8 pre_alloc_lli[3 * sizeof(struct d40_phy_lli)];
};
/**
* struct d40_desc - A descriptor is one DMA job.
*
* @lli_phy: LLI settings for physical channel. Both src and dst=
* points into the lli_pool, to base if lli_len > 1 or to pre_alloc_lli if
* lli_len equals one.
* @lli_log: Same as above but for logical channels.
* @lli_pool: The pool with two entries pre-allocated.
* @lli_len: Number of llis of current descriptor.
* @lli_current: Number of transferred llis.
* @lcla_alloc: Number of LCLA entries allocated.
* @txd: DMA engine struct. Used for among other things for communication
* during a transfer.
* @node: List entry.
* @is_in_client_list: true if the client owns this descriptor.
* @cyclic: true if this is a cyclic job
*
* This descriptor is used for both logical and physical transfers.
*/
struct d40_desc {
/* LLI physical */
struct d40_phy_lli_bidir lli_phy;
/* LLI logical */
struct d40_log_lli_bidir lli_log;
struct d40_lli_pool lli_pool;
int lli_len;
int lli_current;
int lcla_alloc;
struct dma_async_tx_descriptor txd;
struct list_head node;
bool is_in_client_list;
bool cyclic;
};
/**
* struct d40_lcla_pool - LCLA pool settings and data.
*
* @base: The virtual address of LCLA. 18 bit aligned.
* @dma_addr: DMA address, if mapped
* @base_unaligned: The orignal kmalloc pointer, if kmalloc is used.
* This pointer is only there for clean-up on error.
* @pages: The number of pages needed for all physical channels.
* Only used later for clean-up on error
* @lock: Lock to protect the content in this struct.
* @alloc_map: big map over which LCLA entry is own by which job.
*/
struct d40_lcla_pool {
void *base;
dma_addr_t dma_addr;
void *base_unaligned;
int pages;
spinlock_t lock;
struct d40_desc **alloc_map;
};
/**
* struct d40_phy_res - struct for handling eventlines mapped to physical
* channels.
*
* @lock: A lock protection this entity.
* @reserved: True if used by secure world or otherwise.
* @num: The physical channel number of this entity.
* @allocated_src: Bit mapped to show which src event line's are mapped to
* this physical channel. Can also be free or physically allocated.
* @allocated_dst: Same as for src but is dst.
* allocated_dst and allocated_src uses the D40_ALLOC* defines as well as
* event line number.
* @use_soft_lli: To mark if the linked lists of channel are managed by SW.
*/
struct d40_phy_res {
spinlock_t lock;
bool reserved;
int num;
u32 allocated_src;
u32 allocated_dst;
bool use_soft_lli;
};
struct d40_base;
/**
* struct d40_chan - Struct that describes a channel.
*
* @lock: A spinlock to protect this struct.
* @log_num: The logical number, if any of this channel.
* @pending_tx: The number of pending transfers. Used between interrupt handler
* and tasklet.
* @busy: Set to true when transfer is ongoing on this channel.
* @phy_chan: Pointer to physical channel which this instance runs on. If this
* point is NULL, then the channel is not allocated.
* @chan: DMA engine handle.
* @tasklet: Tasklet that gets scheduled from interrupt context to complete a
* transfer and call client callback.
* @client: Cliented owned descriptor list.
* @pending_queue: Submitted jobs, to be issued by issue_pending()
* @active: Active descriptor.
* @done: Completed jobs
* @queue: Queued jobs.
* @prepare_queue: Prepared jobs.
* @dma_cfg: The client configuration of this dma channel.
* @slave_config: DMA slave configuration.
* @configured: whether the dma_cfg configuration is valid
* @base: Pointer to the device instance struct.
* @src_def_cfg: Default cfg register setting for src.
* @dst_def_cfg: Default cfg register setting for dst.
* @log_def: Default logical channel settings.
* @lcpa: Pointer to dst and src lcpa settings.
* @runtime_addr: runtime configured address.
* @runtime_direction: runtime configured direction.
*
* This struct can either "be" a logical or a physical channel.
*/
struct d40_chan {
spinlock_t lock;
int log_num;
int pending_tx;
bool busy;
struct d40_phy_res *phy_chan;
struct dma_chan chan;
struct tasklet_struct tasklet;
struct list_head client;
struct list_head pending_queue;
struct list_head active;
struct list_head done;
struct list_head queue;
struct list_head prepare_queue;
struct stedma40_chan_cfg dma_cfg;
struct dma_slave_config slave_config;
bool configured;
struct d40_base *base;
/* Default register configurations */
u32 src_def_cfg;
u32 dst_def_cfg;
struct d40_def_lcsp log_def;
struct d40_log_lli_full *lcpa;
/* Runtime reconfiguration */
dma_addr_t runtime_addr;
enum dma_transfer_direction runtime_direction;
};
/**
* struct d40_gen_dmac - generic values to represent u8500/u8540 DMA
* controller
*
* @backup: the pointer to the registers address array for backup
* @backup_size: the size of the registers address array for backup
* @realtime_en: the realtime enable register
* @realtime_clear: the realtime clear register
* @high_prio_en: the high priority enable register
* @high_prio_clear: the high priority clear register
* @interrupt_en: the interrupt enable register
* @interrupt_clear: the interrupt clear register
* @il: the pointer to struct d40_interrupt_lookup
* @il_size: the size of d40_interrupt_lookup array
* @init_reg: the pointer to the struct d40_reg_val
* @init_reg_size: the size of d40_reg_val array
*/
struct d40_gen_dmac {
u32 *backup;
u32 backup_size;
u32 realtime_en;
u32 realtime_clear;
u32 high_prio_en;
u32 high_prio_clear;
u32 interrupt_en;
u32 interrupt_clear;
struct d40_interrupt_lookup *il;
u32 il_size;
struct d40_reg_val *init_reg;
u32 init_reg_size;
};
/**
* struct d40_base - The big global struct, one for each probe'd instance.
*
* @interrupt_lock: Lock used to make sure one interrupt is handle a time.
* @execmd_lock: Lock for execute command usage since several channels share
* the same physical register.
* @dev: The device structure.
* @virtbase: The virtual base address of the DMA's register.
* @rev: silicon revision detected.
* @clk: Pointer to the DMA clock structure.
* @irq: The IRQ number.
* @num_memcpy_chans: The number of channels used for memcpy (mem-to-mem
* transfers).
* @num_phy_chans: The number of physical channels. Read from HW. This
* is the number of available channels for this driver, not counting "Secure
* mode" allocated physical channels.
* @num_log_chans: The number of logical channels. Calculated from
* num_phy_chans.
* @dma_both: dma_device channels that can do both memcpy and slave transfers.
* @dma_slave: dma_device channels that can do only do slave transfers.
* @dma_memcpy: dma_device channels that can do only do memcpy transfers.
* @phy_chans: Room for all possible physical channels in system.
* @log_chans: Room for all possible logical channels in system.
* @lookup_log_chans: Used to map interrupt number to logical channel. Points
* to log_chans entries.
* @lookup_phy_chans: Used to map interrupt number to physical channel. Points
* to phy_chans entries.
* @plat_data: Pointer to provided platform_data which is the driver
* configuration.
* @lcpa_regulator: Pointer to hold the regulator for the esram bank for lcla.
* @phy_res: Vector containing all physical channels.
* @lcla_pool: lcla pool settings and data.
* @lcpa_base: The virtual mapped address of LCPA.
* @phy_lcpa: The physical address of the LCPA.
* @lcpa_size: The size of the LCPA area.
* @desc_slab: cache for descriptors.
* @reg_val_backup: Here the values of some hardware registers are stored
* before the DMA is powered off. They are restored when the power is back on.
* @reg_val_backup_v4: Backup of registers that only exits on dma40 v3 and
* later
* @reg_val_backup_chan: Backup data for standard channel parameter registers.
* @regs_interrupt: Scratch space for registers during interrupt.
* @gcc_pwr_off_mask: Mask to maintain the channels that can be turned off.
* @gen_dmac: the struct for generic registers values to represent u8500/8540
* DMA controller
*/
struct d40_base {
spinlock_t interrupt_lock;
spinlock_t execmd_lock;
struct device *dev;
void __iomem *virtbase;
u8 rev:4;
struct clk *clk;
int irq;
int num_memcpy_chans;
int num_phy_chans;
int num_log_chans;
struct dma_device dma_both;
struct dma_device dma_slave;
struct dma_device dma_memcpy;
struct d40_chan *phy_chans;
struct d40_chan *log_chans;
struct d40_chan **lookup_log_chans;
struct d40_chan **lookup_phy_chans;
struct stedma40_platform_data *plat_data;
struct regulator *lcpa_regulator;
/* Physical half channels */
struct d40_phy_res *phy_res;
struct d40_lcla_pool lcla_pool;
void *lcpa_base;
dma_addr_t phy_lcpa;
resource_size_t lcpa_size;
struct kmem_cache *desc_slab;
u32 reg_val_backup[BACKUP_REGS_SZ];
u32 reg_val_backup_v4[BACKUP_REGS_SZ_MAX];
u32 *reg_val_backup_chan;
u32 *regs_interrupt;
u16 gcc_pwr_off_mask;
struct d40_gen_dmac gen_dmac;
};
static struct device *chan2dev(struct d40_chan *d40c)
{
return &d40c->chan.dev->device;
}
static bool chan_is_physical(struct d40_chan *chan)
{
return chan->log_num == D40_PHY_CHAN;
}
static bool chan_is_logical(struct d40_chan *chan)
{
return !chan_is_physical(chan);
}
static void __iomem *chan_base(struct d40_chan *chan)
{
return chan->base->virtbase + D40_DREG_PCBASE +
chan->phy_chan->num * D40_DREG_PCDELTA;
}
#define d40_err(dev, format, arg...) \
dev_err(dev, "[%s] " format, __func__, ## arg)
#define chan_err(d40c, format, arg...) \
d40_err(chan2dev(d40c), format, ## arg)
static int d40_set_runtime_config_write(struct dma_chan *chan,
struct dma_slave_config *config,
enum dma_transfer_direction direction);
static int d40_pool_lli_alloc(struct d40_chan *d40c, struct d40_desc *d40d,
int lli_len)
{
bool is_log = chan_is_logical(d40c);
u32 align;
void *base;
if (is_log)
align = sizeof(struct d40_log_lli);
else
align = sizeof(struct d40_phy_lli);
if (lli_len == 1) {
base = d40d->lli_pool.pre_alloc_lli;
d40d->lli_pool.size = sizeof(d40d->lli_pool.pre_alloc_lli);
d40d->lli_pool.base = NULL;
} else {
d40d->lli_pool.size = lli_len * 2 * align;
base = kmalloc(d40d->lli_pool.size + align, GFP_NOWAIT);
d40d->lli_pool.base = base;
if (d40d->lli_pool.base == NULL)
return -ENOMEM;
}
if (is_log) {
d40d->lli_log.src = PTR_ALIGN(base, align);
d40d->lli_log.dst = d40d->lli_log.src + lli_len;
d40d->lli_pool.dma_addr = 0;
} else {
d40d->lli_phy.src = PTR_ALIGN(base, align);
d40d->lli_phy.dst = d40d->lli_phy.src + lli_len;
d40d->lli_pool.dma_addr = dma_map_single(d40c->base->dev,
d40d->lli_phy.src,
d40d->lli_pool.size,
DMA_TO_DEVICE);
if (dma_mapping_error(d40c->base->dev,
d40d->lli_pool.dma_addr)) {
kfree(d40d->lli_pool.base);
d40d->lli_pool.base = NULL;
d40d->lli_pool.dma_addr = 0;
return -ENOMEM;
}
}
return 0;
}
static void d40_pool_lli_free(struct d40_chan *d40c, struct d40_desc *d40d)
{
if (d40d->lli_pool.dma_addr)
dma_unmap_single(d40c->base->dev, d40d->lli_pool.dma_addr,
d40d->lli_pool.size, DMA_TO_DEVICE);
kfree(d40d->lli_pool.base);
d40d->lli_pool.base = NULL;
d40d->lli_pool.size = 0;
d40d->lli_log.src = NULL;
d40d->lli_log.dst = NULL;
d40d->lli_phy.src = NULL;
d40d->lli_phy.dst = NULL;
}
static int d40_lcla_alloc_one(struct d40_chan *d40c,
struct d40_desc *d40d)
{
unsigned long flags;
int i;
int ret = -EINVAL;
spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
/*
* Allocate both src and dst at the same time, therefore the half
* start on 1 since 0 can't be used since zero is used as end marker.
*/
for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
if (!d40c->base->lcla_pool.alloc_map[idx]) {
d40c->base->lcla_pool.alloc_map[idx] = d40d;
d40d->lcla_alloc++;
ret = i;
break;
}
}
spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
return ret;
}
static int d40_lcla_free_all(struct d40_chan *d40c,
struct d40_desc *d40d)
{
unsigned long flags;
int i;
int ret = -EINVAL;
if (chan_is_physical(d40c))
return 0;
spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
if (d40c->base->lcla_pool.alloc_map[idx] == d40d) {
d40c->base->lcla_pool.alloc_map[idx] = NULL;
d40d->lcla_alloc--;
if (d40d->lcla_alloc == 0) {
ret = 0;
break;
}
}
}
spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
return ret;
}
static void d40_desc_remove(struct d40_desc *d40d)
{
list_del(&d40d->node);
}
static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
{
struct d40_desc *desc = NULL;
if (!list_empty(&d40c->client)) {
struct d40_desc *d;
struct d40_desc *_d;
list_for_each_entry_safe(d, _d, &d40c->client, node) {
if (async_tx_test_ack(&d->txd)) {
d40_desc_remove(d);
desc = d;
memset(desc, 0, sizeof(*desc));
break;
}
}
}
if (!desc)
desc = kmem_cache_zalloc(d40c->base->desc_slab, GFP_NOWAIT);
if (desc)
INIT_LIST_HEAD(&desc->node);
return desc;
}
static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d)
{
d40_pool_lli_free(d40c, d40d);
d40_lcla_free_all(d40c, d40d);
kmem_cache_free(d40c->base->desc_slab, d40d);
}
static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc)
{
list_add_tail(&desc->node, &d40c->active);
}
static void d40_phy_lli_load(struct d40_chan *chan, struct d40_desc *desc)
{
struct d40_phy_lli *lli_dst = desc->lli_phy.dst;
struct d40_phy_lli *lli_src = desc->lli_phy.src;
void __iomem *base = chan_base(chan);
writel(lli_src->reg_cfg, base + D40_CHAN_REG_SSCFG);
writel(lli_src->reg_elt, base + D40_CHAN_REG_SSELT);
writel(lli_src->reg_ptr, base + D40_CHAN_REG_SSPTR);
writel(lli_src->reg_lnk, base + D40_CHAN_REG_SSLNK);
writel(lli_dst->reg_cfg, base + D40_CHAN_REG_SDCFG);
writel(lli_dst->reg_elt, base + D40_CHAN_REG_SDELT);
writel(lli_dst->reg_ptr, base + D40_CHAN_REG_SDPTR);
writel(lli_dst->reg_lnk, base + D40_CHAN_REG_SDLNK);
}
static void d40_desc_done(struct d40_chan *d40c, struct d40_desc *desc)
{
list_add_tail(&desc->node, &d40c->done);
}
static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc)
{
struct d40_lcla_pool *pool = &chan->base->lcla_pool;
struct d40_log_lli_bidir *lli = &desc->lli_log;
int lli_current = desc->lli_current;
int lli_len = desc->lli_len;
bool cyclic = desc->cyclic;
int curr_lcla = -EINVAL;
int first_lcla = 0;
bool use_esram_lcla = chan->base->plat_data->use_esram_lcla;
bool linkback;
/*
* We may have partially running cyclic transfers, in case we did't get
* enough LCLA entries.
*/
linkback = cyclic && lli_current == 0;
/*
* For linkback, we need one LCLA even with only one link, because we
* can't link back to the one in LCPA space
*/
if (linkback || (lli_len - lli_current > 1)) {
/*
* If the channel is expected to use only soft_lli don't
* allocate a lcla. This is to avoid a HW issue that exists
* in some controller during a peripheral to memory transfer
* that uses linked lists.
*/
if (!(chan->phy_chan->use_soft_lli &&
chan->dma_cfg.dir == DMA_DEV_TO_MEM))
curr_lcla = d40_lcla_alloc_one(chan, desc);
first_lcla = curr_lcla;
}
/*
* For linkback, we normally load the LCPA in the loop since we need to
* link it to the second LCLA and not the first. However, if we
* couldn't even get a first LCLA, then we have to run in LCPA and
* reload manually.
*/
if (!linkback || curr_lcla == -EINVAL) {
unsigned int flags = 0;
if (curr_lcla == -EINVAL)
flags |= LLI_TERM_INT;
d40_log_lli_lcpa_write(chan->lcpa,
&lli->dst[lli_current],
&lli->src[lli_current],
curr_lcla,
flags);
lli_current++;
}
if (curr_lcla < 0)
goto set_current;
for (; lli_current < lli_len; lli_current++) {
unsigned int lcla_offset = chan->phy_chan->num * 1024 +
8 * curr_lcla * 2;
struct d40_log_lli *lcla = pool->base + lcla_offset;
unsigned int flags = 0;
int next_lcla;
if (lli_current + 1 < lli_len)
next_lcla = d40_lcla_alloc_one(chan, desc);
else
next_lcla = linkback ? first_lcla : -EINVAL;
if (cyclic || next_lcla == -EINVAL)
flags |= LLI_TERM_INT;
if (linkback && curr_lcla == first_lcla) {
/* First link goes in both LCPA and LCLA */
d40_log_lli_lcpa_write(chan->lcpa,
&lli->dst[lli_current],
&lli->src[lli_current],
next_lcla, flags);
}
/*
* One unused LCLA in the cyclic case if the very first
* next_lcla fails...
*/
d40_log_lli_lcla_write(lcla,
&lli->dst[lli_current],
&lli->src[lli_current],
next_lcla, flags);
/*
* Cache maintenance is not needed if lcla is
* mapped in esram
*/
if (!use_esram_lcla) {
dma_sync_single_range_for_device(chan->base->dev,
pool->dma_addr, lcla_offset,
2 * sizeof(struct d40_log_lli),
DMA_TO_DEVICE);
}
curr_lcla = next_lcla;
if (curr_lcla == -EINVAL || curr_lcla == first_lcla) {
lli_current++;
break;
}
}
set_current:
desc->lli_current = lli_current;
}
static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
{
if (chan_is_physical(d40c)) {
d40_phy_lli_load(d40c, d40d);
d40d->lli_current = d40d->lli_len;
} else
d40_log_lli_to_lcxa(d40c, d40d);
}
static struct d40_desc *d40_first_active_get(struct d40_chan *d40c)
{
return list_first_entry_or_null(&d40c->active, struct d40_desc, node);
}
/* remove desc from current queue and add it to the pending_queue */
static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc)
{
d40_desc_remove(desc);
desc->is_in_client_list = false;
list_add_tail(&desc->node, &d40c->pending_queue);
}
static struct d40_desc *d40_first_pending(struct d40_chan *d40c)
{
return list_first_entry_or_null(&d40c->pending_queue, struct d40_desc,
node);
}
static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
{
return list_first_entry_or_null(&d40c->queue, struct d40_desc, node);
}
static struct d40_desc *d40_first_done(struct d40_chan *d40c)
{
return list_first_entry_or_null(&d40c->done, struct d40_desc, node);
}
static int d40_psize_2_burst_size(bool is_log, int psize)
{
if (is_log) {
if (psize == STEDMA40_PSIZE_LOG_1)
return 1;
} else {
if (psize == STEDMA40_PSIZE_PHY_1)
return 1;
}
return 2 << psize;
}
/*
* The dma only supports transmitting packages up to
* STEDMA40_MAX_SEG_SIZE * data_width, where data_width is stored in Bytes.
*
* Calculate the total number of dma elements required to send the entire sg list.
*/
static int d40_size_2_dmalen(int size, u32 data_width1, u32 data_width2)
{
int dmalen;
u32 max_w = max(data_width1, data_width2);
u32 min_w = min(data_width1, data_width2);
u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
if (seg_max > STEDMA40_MAX_SEG_SIZE)
seg_max -= max_w;
if (!IS_ALIGNED(size, max_w))
return -EINVAL;
if (size <= seg_max)
dmalen = 1;
else {
dmalen = size / seg_max;
if (dmalen * seg_max < size)
dmalen++;
}
return dmalen;
}
static int d40_sg_2_dmalen(struct scatterlist *sgl, int sg_len,
u32 data_width1, u32 data_width2)
{
struct scatterlist *sg;
int i;
int len = 0;
int ret;
for_each_sg(sgl, sg, sg_len, i) {
ret = d40_size_2_dmalen(sg_dma_len(sg),
data_width1, data_width2);
if (ret < 0)
return ret;
len += ret;
}
return len;
}
static int __d40_execute_command_phy(struct d40_chan *d40c,
enum d40_command command)
{
u32 status;
int i;
void __iomem *active_reg;
int ret = 0;
unsigned long flags;
u32 wmask;
if (command == D40_DMA_STOP) {
ret = __d40_execute_command_phy(d40c, D40_DMA_SUSPEND_REQ);
if (ret)
return ret;
}
spin_lock_irqsave(&d40c->base->execmd_lock, flags);
if (d40c->phy_chan->num % 2 == 0)
active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
else
active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
if (command == D40_DMA_SUSPEND_REQ) {
status = (readl(active_reg) &
D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
D40_CHAN_POS(d40c->phy_chan->num);
if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
goto unlock;
}
wmask = 0xffffffff & ~(D40_CHAN_POS_MASK(d40c->phy_chan->num));
writel(wmask | (command << D40_CHAN_POS(d40c->phy_chan->num)),
active_reg);
if (command == D40_DMA_SUSPEND_REQ) {
for (i = 0 ; i < D40_SUSPEND_MAX_IT; i++) {
status = (readl(active_reg) &
D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
D40_CHAN_POS(d40c->phy_chan->num);
cpu_relax();
/*
* Reduce the number of bus accesses while
* waiting for the DMA to suspend.
*/
udelay(3);
if (status == D40_DMA_STOP ||
status == D40_DMA_SUSPENDED)
break;
}
if (i == D40_SUSPEND_MAX_IT) {
chan_err(d40c,
"unable to suspend the chl %d (log: %d) status %x\n",
d40c->phy_chan->num, d40c->log_num,
status);
dump_stack();
ret = -EBUSY;
}
}
unlock:
spin_unlock_irqrestore(&d40c->base->execmd_lock, flags);
return ret;
}
static void d40_term_all(struct d40_chan *d40c)
{
struct d40_desc *d40d;
struct d40_desc *_d;
/* Release completed descriptors */
while ((d40d = d40_first_done(d40c))) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
/* Release active descriptors */
while ((d40d = d40_first_active_get(d40c))) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
/* Release queued descriptors waiting for transfer */
while ((d40d = d40_first_queued(d40c))) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
/* Release pending descriptors */
while ((d40d = d40_first_pending(d40c))) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
/* Release client owned descriptors */
if (!list_empty(&d40c->client))
list_for_each_entry_safe(d40d, _d, &d40c->client, node) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
/* Release descriptors in prepare queue */
if (!list_empty(&d40c->prepare_queue))
list_for_each_entry_safe(d40d, _d,
&d40c->prepare_queue, node) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
}
d40c->pending_tx = 0;
}
static void __d40_config_set_event(struct d40_chan *d40c,
enum d40_events event_type, u32 event,
int reg)
{
void __iomem *addr = chan_base(d40c) + reg;
int tries;
u32 status;
switch (event_type) {
case D40_DEACTIVATE_EVENTLINE:
writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event))
| ~D40_EVENTLINE_MASK(event), addr);
break;
case D40_SUSPEND_REQ_EVENTLINE:
status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
D40_EVENTLINE_POS(event);
if (status == D40_DEACTIVATE_EVENTLINE ||
status == D40_SUSPEND_REQ_EVENTLINE)
break;
writel((D40_SUSPEND_REQ_EVENTLINE << D40_EVENTLINE_POS(event))
| ~D40_EVENTLINE_MASK(event), addr);
for (tries = 0 ; tries < D40_SUSPEND_MAX_IT; tries++) {
status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
D40_EVENTLINE_POS(event);
cpu_relax();
/*
* Reduce the number of bus accesses while
* waiting for the DMA to suspend.
*/
udelay(3);
if (status == D40_DEACTIVATE_EVENTLINE)
break;
}
if (tries == D40_SUSPEND_MAX_IT) {
chan_err(d40c,
"unable to stop the event_line chl %d (log: %d)"
"status %x\n", d40c->phy_chan->num,
d40c->log_num, status);
}
break;
case D40_ACTIVATE_EVENTLINE:
/*
* The hardware sometimes doesn't register the enable when src and dst
* event lines are active on the same logical channel. Retry to ensure
* it does. Usually only one retry is sufficient.
*/
tries = 100;
while (--tries) {
writel((D40_ACTIVATE_EVENTLINE <<
D40_EVENTLINE_POS(event)) |
~D40_EVENTLINE_MASK(event), addr);
if (readl(addr) & D40_EVENTLINE_MASK(event))
break;
}
if (tries != 99)
dev_dbg(chan2dev(d40c),
"[%s] workaround enable S%cLNK (%d tries)\n",
__func__, reg == D40_CHAN_REG_SSLNK ? 'S' : 'D',
100 - tries);
WARN_ON(!tries);
break;
case D40_ROUND_EVENTLINE:
BUG();
break;
}
}
static void d40_config_set_event(struct d40_chan *d40c,
enum d40_events event_type)
{
u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
/* Enable event line connected to device (or memcpy) */
if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) ||
(d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
__d40_config_set_event(d40c, event_type, event,
D40_CHAN_REG_SSLNK);
if (d40c->dma_cfg.dir != DMA_DEV_TO_MEM)
__d40_config_set_event(d40c, event_type, event,
D40_CHAN_REG_SDLNK);
}
static u32 d40_chan_has_events(struct d40_chan *d40c)
{
void __iomem *chanbase = chan_base(d40c);
u32 val;
val = readl(chanbase + D40_CHAN_REG_SSLNK);
val |= readl(chanbase + D40_CHAN_REG_SDLNK);
return val;
}
static int
__d40_execute_command_log(struct d40_chan *d40c, enum d40_command command)
{
unsigned long flags;
int ret = 0;
u32 active_status;
void __iomem *active_reg;
if (d40c->phy_chan->num % 2 == 0)
active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
else
active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
spin_lock_irqsave(&d40c->phy_chan->lock, flags);
switch (command) {
case D40_DMA_STOP:
case D40_DMA_SUSPEND_REQ:
active_status = (readl(active_reg) &
D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
D40_CHAN_POS(d40c->phy_chan->num);
if (active_status == D40_DMA_RUN)
d40_config_set_event(d40c, D40_SUSPEND_REQ_EVENTLINE);
else
d40_config_set_event(d40c, D40_DEACTIVATE_EVENTLINE);
if (!d40_chan_has_events(d40c) && (command == D40_DMA_STOP))
ret = __d40_execute_command_phy(d40c, command);
break;
case D40_DMA_RUN:
d40_config_set_event(d40c, D40_ACTIVATE_EVENTLINE);
ret = __d40_execute_command_phy(d40c, command);
break;
case D40_DMA_SUSPENDED:
BUG();
break;
}
spin_unlock_irqrestore(&d40c->phy_chan->lock, flags);
return ret;
}
static int d40_channel_execute_command(struct d40_chan *d40c,
enum d40_command command)
{
if (chan_is_logical(d40c))
return __d40_execute_command_log(d40c, command);
else
return __d40_execute_command_phy(d40c, command);
}
static u32 d40_get_prmo(struct d40_chan *d40c)
{
static const unsigned int phy_map[] = {
[STEDMA40_PCHAN_BASIC_MODE]
= D40_DREG_PRMO_PCHAN_BASIC,
[STEDMA40_PCHAN_MODULO_MODE]
= D40_DREG_PRMO_PCHAN_MODULO,
[STEDMA40_PCHAN_DOUBLE_DST_MODE]
= D40_DREG_PRMO_PCHAN_DOUBLE_DST,
};
static const unsigned int log_map[] = {
[STEDMA40_LCHAN_SRC_PHY_DST_LOG]
= D40_DREG_PRMO_LCHAN_SRC_PHY_DST_LOG,
[STEDMA40_LCHAN_SRC_LOG_DST_PHY]
= D40_DREG_PRMO_LCHAN_SRC_LOG_DST_PHY,
[STEDMA40_LCHAN_SRC_LOG_DST_LOG]
= D40_DREG_PRMO_LCHAN_SRC_LOG_DST_LOG,
};
if (chan_is_physical(d40c))
return phy_map[d40c->dma_cfg.mode_opt];
else
return log_map[d40c->dma_cfg.mode_opt];
}
static void d40_config_write(struct d40_chan *d40c)
{
u32 addr_base;
u32 var;
/* Odd addresses are even addresses + 4 */
addr_base = (d40c->phy_chan->num % 2) * 4;
/* Setup channel mode to logical or physical */
var = ((u32)(chan_is_logical(d40c)) + 1) <<
D40_CHAN_POS(d40c->phy_chan->num);
writel(var, d40c->base->virtbase + D40_DREG_PRMSE + addr_base);
/* Setup operational mode option register */
var = d40_get_prmo(d40c) << D40_CHAN_POS(d40c->phy_chan->num);
writel(var, d40c->base->virtbase + D40_DREG_PRMOE + addr_base);
if (chan_is_logical(d40c)) {
int lidx = (d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS)
& D40_SREG_ELEM_LOG_LIDX_MASK;
void __iomem *chanbase = chan_base(d40c);
/* Set default config for CFG reg */
writel(d40c->src_def_cfg, chanbase + D40_CHAN_REG_SSCFG);
writel(d40c->dst_def_cfg, chanbase + D40_CHAN_REG_SDCFG);
/* Set LIDX for lcla */
writel(lidx, chanbase + D40_CHAN_REG_SSELT);
writel(lidx, chanbase + D40_CHAN_REG_SDELT);
/* Clear LNK which will be used by d40_chan_has_events() */
writel(0, chanbase + D40_CHAN_REG_SSLNK);
writel(0, chanbase + D40_CHAN_REG_SDLNK);
}
}
static u32 d40_residue(struct d40_chan *d40c)
{
u32 num_elt;
if (chan_is_logical(d40c))
num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK)
>> D40_MEM_LCSP2_ECNT_POS;
else {
u32 val = readl(chan_base(d40c) + D40_CHAN_REG_SDELT);
num_elt = (val & D40_SREG_ELEM_PHY_ECNT_MASK)
>> D40_SREG_ELEM_PHY_ECNT_POS;
}
return num_elt * d40c->dma_cfg.dst_info.data_width;
}
static bool d40_tx_is_linked(struct d40_chan *d40c)
{
bool is_link;
if (chan_is_logical(d40c))
is_link = readl(&d40c->lcpa->lcsp3) & D40_MEM_LCSP3_DLOS_MASK;
else
is_link = readl(chan_base(d40c) + D40_CHAN_REG_SDLNK)
& D40_SREG_LNK_PHYS_LNK_MASK;
return is_link;
}
static int d40_pause(struct dma_chan *chan)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
int res = 0;
unsigned long flags;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Channel is not allocated!\n");
return -EINVAL;
}
if (!d40c->busy)
return 0;
spin_lock_irqsave(&d40c->lock, flags);
pm_runtime_get_sync(d40c->base->dev);
res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
spin_unlock_irqrestore(&d40c->lock, flags);
return res;
}
static int d40_resume(struct dma_chan *chan)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
int res = 0;
unsigned long flags;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Channel is not allocated!\n");
return -EINVAL;
}
if (!d40c->busy)
return 0;
spin_lock_irqsave(&d40c->lock, flags);
pm_runtime_get_sync(d40c->base->dev);
/* If bytes left to transfer or linked tx resume job */
if (d40_residue(d40c) || d40_tx_is_linked(d40c))
res = d40_channel_execute_command(d40c, D40_DMA_RUN);
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
spin_unlock_irqrestore(&d40c->lock, flags);
return res;
}
static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct d40_chan *d40c = container_of(tx->chan,
struct d40_chan,
chan);
struct d40_desc *d40d = container_of(tx, struct d40_desc, txd);
unsigned long flags;
dma_cookie_t cookie;
spin_lock_irqsave(&d40c->lock, flags);
cookie = dma_cookie_assign(tx);
d40_desc_queue(d40c, d40d);
spin_unlock_irqrestore(&d40c->lock, flags);
return cookie;
}
static int d40_start(struct d40_chan *d40c)
{
return d40_channel_execute_command(d40c, D40_DMA_RUN);
}
static struct d40_desc *d40_queue_start(struct d40_chan *d40c)
{
struct d40_desc *d40d;
int err;
/* Start queued jobs, if any */
d40d = d40_first_queued(d40c);
if (d40d != NULL) {
if (!d40c->busy) {
d40c->busy = true;
pm_runtime_get_sync(d40c->base->dev);
}
/* Remove from queue */
d40_desc_remove(d40d);
/* Add to active queue */
d40_desc_submit(d40c, d40d);
/* Initiate DMA job */
d40_desc_load(d40c, d40d);
/* Start dma job */
err = d40_start(d40c);
if (err)
return NULL;
}
return d40d;
}
/* called from interrupt context */
static void dma_tc_handle(struct d40_chan *d40c)
{
struct d40_desc *d40d;
/* Get first active entry from list */
d40d = d40_first_active_get(d40c);
if (d40d == NULL)
return;
if (d40d->cyclic) {
/*
* If this was a paritially loaded list, we need to reloaded
* it, and only when the list is completed. We need to check
* for done because the interrupt will hit for every link, and
* not just the last one.
*/
if (d40d->lli_current < d40d->lli_len
&& !d40_tx_is_linked(d40c)
&& !d40_residue(d40c)) {
d40_lcla_free_all(d40c, d40d);
d40_desc_load(d40c, d40d);
(void) d40_start(d40c);
if (d40d->lli_current == d40d->lli_len)
d40d->lli_current = 0;
}
} else {
d40_lcla_free_all(d40c, d40d);
if (d40d->lli_current < d40d->lli_len) {
d40_desc_load(d40c, d40d);
/* Start dma job */
(void) d40_start(d40c);
return;
}
if (d40_queue_start(d40c) == NULL) {
d40c->busy = false;
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
}
d40_desc_remove(d40d);
d40_desc_done(d40c, d40d);
}
d40c->pending_tx++;
tasklet_schedule(&d40c->tasklet);
}
static void dma_tasklet(struct tasklet_struct *t)
{
struct d40_chan *d40c = from_tasklet(d40c, t, tasklet);
struct d40_desc *d40d;
unsigned long flags;
bool callback_active;
struct dmaengine_desc_callback cb;
spin_lock_irqsave(&d40c->lock, flags);
/* Get first entry from the done list */
d40d = d40_first_done(d40c);
if (d40d == NULL) {
/* Check if we have reached here for cyclic job */
d40d = d40_first_active_get(d40c);
if (d40d == NULL || !d40d->cyclic)
goto check_pending_tx;
}
if (!d40d->cyclic)
dma_cookie_complete(&d40d->txd);
/*
* If terminating a channel pending_tx is set to zero.
* This prevents any finished active jobs to return to the client.
*/
if (d40c->pending_tx == 0) {
spin_unlock_irqrestore(&d40c->lock, flags);
return;
}
/* Callback to client */
callback_active = !!(d40d->txd.flags & DMA_PREP_INTERRUPT);
dmaengine_desc_get_callback(&d40d->txd, &cb);
if (!d40d->cyclic) {
if (async_tx_test_ack(&d40d->txd)) {
d40_desc_remove(d40d);
d40_desc_free(d40c, d40d);
} else if (!d40d->is_in_client_list) {
d40_desc_remove(d40d);
d40_lcla_free_all(d40c, d40d);
list_add_tail(&d40d->node, &d40c->client);
d40d->is_in_client_list = true;
}
}
d40c->pending_tx--;
if (d40c->pending_tx)
tasklet_schedule(&d40c->tasklet);
spin_unlock_irqrestore(&d40c->lock, flags);
if (callback_active)
dmaengine_desc_callback_invoke(&cb, NULL);
return;
check_pending_tx:
/* Rescue manouver if receiving double interrupts */
if (d40c->pending_tx > 0)
d40c->pending_tx--;
spin_unlock_irqrestore(&d40c->lock, flags);
}
static irqreturn_t d40_handle_interrupt(int irq, void *data)
{
int i;
u32 idx;
u32 row;
long chan = -1;
struct d40_chan *d40c;
struct d40_base *base = data;
u32 *regs = base->regs_interrupt;
struct d40_interrupt_lookup *il = base->gen_dmac.il;
u32 il_size = base->gen_dmac.il_size;
spin_lock(&base->interrupt_lock);
/* Read interrupt status of both logical and physical channels */
for (i = 0; i < il_size; i++)
regs[i] = readl(base->virtbase + il[i].src);
for (;;) {
chan = find_next_bit((unsigned long *)regs,
BITS_PER_LONG * il_size, chan + 1);
/* No more set bits found? */
if (chan == BITS_PER_LONG * il_size)
break;
row = chan / BITS_PER_LONG;
idx = chan & (BITS_PER_LONG - 1);
if (il[row].offset == D40_PHY_CHAN)
d40c = base->lookup_phy_chans[idx];
else
d40c = base->lookup_log_chans[il[row].offset + idx];
if (!d40c) {
/*
* No error because this can happen if something else
* in the system is using the channel.
*/
continue;
}
/* ACK interrupt */
writel(BIT(idx), base->virtbase + il[row].clr);
spin_lock(&d40c->lock);
if (!il[row].is_error)
dma_tc_handle(d40c);
else
d40_err(base->dev, "IRQ chan: %ld offset %d idx %d\n",
chan, il[row].offset, idx);
spin_unlock(&d40c->lock);
}
spin_unlock(&base->interrupt_lock);
return IRQ_HANDLED;
}
static int d40_validate_conf(struct d40_chan *d40c,
struct stedma40_chan_cfg *conf)
{
int res = 0;
bool is_log = conf->mode == STEDMA40_MODE_LOGICAL;
if (!conf->dir) {
chan_err(d40c, "Invalid direction.\n");
res = -EINVAL;
}
if ((is_log && conf->dev_type > d40c->base->num_log_chans) ||
(!is_log && conf->dev_type > d40c->base->num_phy_chans) ||
(conf->dev_type < 0)) {
chan_err(d40c, "Invalid device type (%d)\n", conf->dev_type);
res = -EINVAL;
}
if (conf->dir == DMA_DEV_TO_DEV) {
/*
* DMAC HW supports it. Will be added to this driver,
* in case any dma client requires it.
*/
chan_err(d40c, "periph to periph not supported\n");
res = -EINVAL;
}
if (d40_psize_2_burst_size(is_log, conf->src_info.psize) *
conf->src_info.data_width !=
d40_psize_2_burst_size(is_log, conf->dst_info.psize) *
conf->dst_info.data_width) {
/*
* The DMAC hardware only supports
* src (burst x width) == dst (burst x width)
*/
chan_err(d40c, "src (burst x width) != dst (burst x width)\n");
res = -EINVAL;
}
return res;
}
static bool d40_alloc_mask_set(struct d40_phy_res *phy,
bool is_src, int log_event_line, bool is_log,
bool *first_user)
{
unsigned long flags;
spin_lock_irqsave(&phy->lock, flags);
*first_user = ((phy->allocated_src | phy->allocated_dst)
== D40_ALLOC_FREE);
if (!is_log) {
/* Physical interrupts are masked per physical full channel */
if (phy->allocated_src == D40_ALLOC_FREE &&
phy->allocated_dst == D40_ALLOC_FREE) {
phy->allocated_dst = D40_ALLOC_PHY;
phy->allocated_src = D40_ALLOC_PHY;
goto found_unlock;
} else
goto not_found_unlock;
}
/* Logical channel */
if (is_src) {
if (phy->allocated_src == D40_ALLOC_PHY)
goto not_found_unlock;
if (phy->allocated_src == D40_ALLOC_FREE)
phy->allocated_src = D40_ALLOC_LOG_FREE;
if (!(phy->allocated_src & BIT(log_event_line))) {
phy->allocated_src |= BIT(log_event_line);
goto found_unlock;
} else
goto not_found_unlock;
} else {
if (phy->allocated_dst == D40_ALLOC_PHY)
goto not_found_unlock;
if (phy->allocated_dst == D40_ALLOC_FREE)
phy->allocated_dst = D40_ALLOC_LOG_FREE;
if (!(phy->allocated_dst & BIT(log_event_line))) {
phy->allocated_dst |= BIT(log_event_line);
goto found_unlock;
}
}
not_found_unlock:
spin_unlock_irqrestore(&phy->lock, flags);
return false;
found_unlock:
spin_unlock_irqrestore(&phy->lock, flags);
return true;
}
static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
int log_event_line)
{
unsigned long flags;
bool is_free = false;
spin_lock_irqsave(&phy->lock, flags);
if (!log_event_line) {
phy->allocated_dst = D40_ALLOC_FREE;
phy->allocated_src = D40_ALLOC_FREE;
is_free = true;
goto unlock;
}
/* Logical channel */
if (is_src) {
phy->allocated_src &= ~BIT(log_event_line);
if (phy->allocated_src == D40_ALLOC_LOG_FREE)
phy->allocated_src = D40_ALLOC_FREE;
} else {
phy->allocated_dst &= ~BIT(log_event_line);
if (phy->allocated_dst == D40_ALLOC_LOG_FREE)
phy->allocated_dst = D40_ALLOC_FREE;
}
is_free = ((phy->allocated_src | phy->allocated_dst) ==
D40_ALLOC_FREE);
unlock:
spin_unlock_irqrestore(&phy->lock, flags);
return is_free;
}
static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
{
int dev_type = d40c->dma_cfg.dev_type;
int event_group;
int event_line;
struct d40_phy_res *phys;
int i;
int j;
int log_num;
int num_phy_chans;
bool is_src;
bool is_log = d40c->dma_cfg.mode == STEDMA40_MODE_LOGICAL;
phys = d40c->base->phy_res;
num_phy_chans = d40c->base->num_phy_chans;
if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
log_num = 2 * dev_type;
is_src = true;
} else if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
/* dst event lines are used for logical memcpy */
log_num = 2 * dev_type + 1;
is_src = false;
} else
return -EINVAL;
event_group = D40_TYPE_TO_GROUP(dev_type);
event_line = D40_TYPE_TO_EVENT(dev_type);
if (!is_log) {
if (d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
/* Find physical half channel */
if (d40c->dma_cfg.use_fixed_channel) {
i = d40c->dma_cfg.phy_channel;
if (d40_alloc_mask_set(&phys[i], is_src,
0, is_log,
first_phy_user))
goto found_phy;
} else {
for (i = 0; i < num_phy_chans; i++) {
if (d40_alloc_mask_set(&phys[i], is_src,
0, is_log,
first_phy_user))
goto found_phy;
}
}
} else
for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
int phy_num = j + event_group * 2;
for (i = phy_num; i < phy_num + 2; i++) {
if (d40_alloc_mask_set(&phys[i],
is_src,
0,
is_log,
first_phy_user))
goto found_phy;
}
}
return -EINVAL;
found_phy:
d40c->phy_chan = &phys[i];
d40c->log_num = D40_PHY_CHAN;
goto out;
}
if (dev_type == -1)
return -EINVAL;
/* Find logical channel */
for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
int phy_num = j + event_group * 2;
if (d40c->dma_cfg.use_fixed_channel) {
i = d40c->dma_cfg.phy_channel;
if ((i != phy_num) && (i != phy_num + 1)) {
dev_err(chan2dev(d40c),
"invalid fixed phy channel %d\n", i);
return -EINVAL;
}
if (d40_alloc_mask_set(&phys[i], is_src, event_line,
is_log, first_phy_user))
goto found_log;
dev_err(chan2dev(d40c),
"could not allocate fixed phy channel %d\n", i);
return -EINVAL;
}
/*
* Spread logical channels across all available physical rather
* than pack every logical channel at the first available phy
* channels.
*/
if (is_src) {
for (i = phy_num; i < phy_num + 2; i++) {
if (d40_alloc_mask_set(&phys[i], is_src,
event_line, is_log,
first_phy_user))
goto found_log;
}
} else {
for (i = phy_num + 1; i >= phy_num; i--) {
if (d40_alloc_mask_set(&phys[i], is_src,
event_line, is_log,
first_phy_user))
goto found_log;
}
}
}
return -EINVAL;
found_log:
d40c->phy_chan = &phys[i];
d40c->log_num = log_num;
out:
if (is_log)
d40c->base->lookup_log_chans[d40c->log_num] = d40c;
else
d40c->base->lookup_phy_chans[d40c->phy_chan->num] = d40c;
return 0;
}
static int d40_config_memcpy(struct d40_chan *d40c)
{
dma_cap_mask_t cap = d40c->chan.device->cap_mask;
if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) {
d40c->dma_cfg = dma40_memcpy_conf_log;
d40c->dma_cfg.dev_type = dma40_memcpy_channels[d40c->chan.chan_id];
d40_log_cfg(&d40c->dma_cfg,
&d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
} else if (dma_has_cap(DMA_MEMCPY, cap) &&
dma_has_cap(DMA_SLAVE, cap)) {
d40c->dma_cfg = dma40_memcpy_conf_phy;
/* Generate interrupt at end of transfer or relink. */
d40c->dst_def_cfg |= BIT(D40_SREG_CFG_TIM_POS);
/* Generate interrupt on error. */
d40c->src_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
d40c->dst_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
} else {
chan_err(d40c, "No memcpy\n");
return -EINVAL;
}
return 0;
}
static int d40_free_dma(struct d40_chan *d40c)
{
int res = 0;
u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
struct d40_phy_res *phy = d40c->phy_chan;
bool is_src;
/* Terminate all queued and active transfers */
d40_term_all(d40c);
if (phy == NULL) {
chan_err(d40c, "phy == null\n");
return -EINVAL;
}
if (phy->allocated_src == D40_ALLOC_FREE &&
phy->allocated_dst == D40_ALLOC_FREE) {
chan_err(d40c, "channel already free\n");
return -EINVAL;
}
if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
d40c->dma_cfg.dir == DMA_MEM_TO_MEM)
is_src = false;
else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
is_src = true;
else {
chan_err(d40c, "Unknown direction\n");
return -EINVAL;
}
pm_runtime_get_sync(d40c->base->dev);
res = d40_channel_execute_command(d40c, D40_DMA_STOP);
if (res) {
chan_err(d40c, "stop failed\n");
goto mark_last_busy;
}
d40_alloc_mask_free(phy, is_src, chan_is_logical(d40c) ? event : 0);
if (chan_is_logical(d40c))
d40c->base->lookup_log_chans[d40c->log_num] = NULL;
else
d40c->base->lookup_phy_chans[phy->num] = NULL;
if (d40c->busy) {
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
}
d40c->busy = false;
d40c->phy_chan = NULL;
d40c->configured = false;
mark_last_busy:
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
return res;
}
static bool d40_is_paused(struct d40_chan *d40c)
{
void __iomem *chanbase = chan_base(d40c);
bool is_paused = false;
unsigned long flags;
void __iomem *active_reg;
u32 status;
u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
spin_lock_irqsave(&d40c->lock, flags);
if (chan_is_physical(d40c)) {
if (d40c->phy_chan->num % 2 == 0)
active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
else
active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
status = (readl(active_reg) &
D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
D40_CHAN_POS(d40c->phy_chan->num);
if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
is_paused = true;
goto unlock;
}
if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
status = readl(chanbase + D40_CHAN_REG_SDLNK);
} else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
status = readl(chanbase + D40_CHAN_REG_SSLNK);
} else {
chan_err(d40c, "Unknown direction\n");
goto unlock;
}
status = (status & D40_EVENTLINE_MASK(event)) >>
D40_EVENTLINE_POS(event);
if (status != D40_DMA_RUN)
is_paused = true;
unlock:
spin_unlock_irqrestore(&d40c->lock, flags);
return is_paused;
}
static u32 stedma40_residue(struct dma_chan *chan)
{
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
u32 bytes_left;
unsigned long flags;
spin_lock_irqsave(&d40c->lock, flags);
bytes_left = d40_residue(d40c);
spin_unlock_irqrestore(&d40c->lock, flags);
return bytes_left;
}
static int
d40_prep_sg_log(struct d40_chan *chan, struct d40_desc *desc,
struct scatterlist *sg_src, struct scatterlist *sg_dst,
unsigned int sg_len, dma_addr_t src_dev_addr,
dma_addr_t dst_dev_addr)
{
struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
struct stedma40_half_channel_info *src_info = &cfg->src_info;
struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
int ret;
ret = d40_log_sg_to_lli(sg_src, sg_len,
src_dev_addr,
desc->lli_log.src,
chan->log_def.lcsp1,
src_info->data_width,
dst_info->data_width);
ret = d40_log_sg_to_lli(sg_dst, sg_len,
dst_dev_addr,
desc->lli_log.dst,
chan->log_def.lcsp3,
dst_info->data_width,
src_info->data_width);
return ret < 0 ? ret : 0;
}
static int
d40_prep_sg_phy(struct d40_chan *chan, struct d40_desc *desc,
struct scatterlist *sg_src, struct scatterlist *sg_dst,
unsigned int sg_len, dma_addr_t src_dev_addr,
dma_addr_t dst_dev_addr)
{
struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
struct stedma40_half_channel_info *src_info = &cfg->src_info;
struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
unsigned long flags = 0;
int ret;
if (desc->cyclic)
flags |= LLI_CYCLIC | LLI_TERM_INT;
ret = d40_phy_sg_to_lli(sg_src, sg_len, src_dev_addr,
desc->lli_phy.src,
virt_to_phys(desc->lli_phy.src),
chan->src_def_cfg,
src_info, dst_info, flags);
ret = d40_phy_sg_to_lli(sg_dst, sg_len, dst_dev_addr,
desc->lli_phy.dst,
virt_to_phys(desc->lli_phy.dst),
chan->dst_def_cfg,
dst_info, src_info, flags);
dma_sync_single_for_device(chan->base->dev, desc->lli_pool.dma_addr,
desc->lli_pool.size, DMA_TO_DEVICE);
return ret < 0 ? ret : 0;
}
static struct d40_desc *
d40_prep_desc(struct d40_chan *chan, struct scatterlist *sg,
unsigned int sg_len, unsigned long dma_flags)
{
struct stedma40_chan_cfg *cfg;
struct d40_desc *desc;
int ret;
desc = d40_desc_get(chan);
if (!desc)
return NULL;
cfg = &chan->dma_cfg;
desc->lli_len = d40_sg_2_dmalen(sg, sg_len, cfg->src_info.data_width,
cfg->dst_info.data_width);
if (desc->lli_len < 0) {
chan_err(chan, "Unaligned size\n");
goto free_desc;
}
ret = d40_pool_lli_alloc(chan, desc, desc->lli_len);
if (ret < 0) {
chan_err(chan, "Could not allocate lli\n");
goto free_desc;
}
desc->lli_current = 0;
desc->txd.flags = dma_flags;
desc->txd.tx_submit = d40_tx_submit;
dma_async_tx_descriptor_init(&desc->txd, &chan->chan);
return desc;
free_desc:
d40_desc_free(chan, desc);
return NULL;
}
static struct dma_async_tx_descriptor *
d40_prep_sg(struct dma_chan *dchan, struct scatterlist *sg_src,
struct scatterlist *sg_dst, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long dma_flags)
{
struct d40_chan *chan = container_of(dchan, struct d40_chan, chan);
dma_addr_t src_dev_addr;
dma_addr_t dst_dev_addr;
struct d40_desc *desc;
unsigned long flags;
int ret;
if (!chan->phy_chan) {
chan_err(chan, "Cannot prepare unallocated channel\n");
return NULL;
}
d40_set_runtime_config_write(dchan, &chan->slave_config, direction);
spin_lock_irqsave(&chan->lock, flags);
desc = d40_prep_desc(chan, sg_src, sg_len, dma_flags);
if (desc == NULL)
goto unlock;
if (sg_next(&sg_src[sg_len - 1]) == sg_src)
desc->cyclic = true;
src_dev_addr = 0;
dst_dev_addr = 0;
if (direction == DMA_DEV_TO_MEM)
src_dev_addr = chan->runtime_addr;
else if (direction == DMA_MEM_TO_DEV)
dst_dev_addr = chan->runtime_addr;
if (chan_is_logical(chan))
ret = d40_prep_sg_log(chan, desc, sg_src, sg_dst,
sg_len, src_dev_addr, dst_dev_addr);
else
ret = d40_prep_sg_phy(chan, desc, sg_src, sg_dst,
sg_len, src_dev_addr, dst_dev_addr);
if (ret) {
chan_err(chan, "Failed to prepare %s sg job: %d\n",
chan_is_logical(chan) ? "log" : "phy", ret);
goto free_desc;
}
/*
* add descriptor to the prepare queue in order to be able
* to free them later in terminate_all
*/
list_add_tail(&desc->node, &chan->prepare_queue);
spin_unlock_irqrestore(&chan->lock, flags);
return &desc->txd;
free_desc:
d40_desc_free(chan, desc);
unlock:
spin_unlock_irqrestore(&chan->lock, flags);
return NULL;
}
static bool stedma40_filter(struct dma_chan *chan, void *data)
{
struct stedma40_chan_cfg *info = data;
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
int err;
if (data) {
err = d40_validate_conf(d40c, info);
if (!err)
d40c->dma_cfg = *info;
} else
err = d40_config_memcpy(d40c);
if (!err)
d40c->configured = true;
return err == 0;
}
static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src)
{
bool realtime = d40c->dma_cfg.realtime;
bool highprio = d40c->dma_cfg.high_priority;
u32 rtreg;
u32 event = D40_TYPE_TO_EVENT(dev_type);
u32 group = D40_TYPE_TO_GROUP(dev_type);
u32 bit = BIT(event);
u32 prioreg;
struct d40_gen_dmac *dmac = &d40c->base->gen_dmac;
rtreg = realtime ? dmac->realtime_en : dmac->realtime_clear;
/*
* Due to a hardware bug, in some cases a logical channel triggered by
* a high priority destination event line can generate extra packet
* transactions.
*
* The workaround is to not set the high priority level for the
* destination event lines that trigger logical channels.
*/
if (!src && chan_is_logical(d40c))
highprio = false;
prioreg = highprio ? dmac->high_prio_en : dmac->high_prio_clear;
/* Destination event lines are stored in the upper halfword */
if (!src)
bit <<= 16;
writel(bit, d40c->base->virtbase + prioreg + group * 4);
writel(bit, d40c->base->virtbase + rtreg + group * 4);
}
static void d40_set_prio_realtime(struct d40_chan *d40c)
{
if (d40c->base->rev < 3)
return;
if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) ||
(d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
__d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, true);
if ((d40c->dma_cfg.dir == DMA_MEM_TO_DEV) ||
(d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
__d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, false);
}
#define D40_DT_FLAGS_MODE(flags) ((flags >> 0) & 0x1)
#define D40_DT_FLAGS_DIR(flags) ((flags >> 1) & 0x1)
#define D40_DT_FLAGS_BIG_ENDIAN(flags) ((flags >> 2) & 0x1)
#define D40_DT_FLAGS_FIXED_CHAN(flags) ((flags >> 3) & 0x1)
#define D40_DT_FLAGS_HIGH_PRIO(flags) ((flags >> 4) & 0x1)
static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct stedma40_chan_cfg cfg;
dma_cap_mask_t cap;
u32 flags;
memset(&cfg, 0, sizeof(struct stedma40_chan_cfg));
dma_cap_zero(cap);
dma_cap_set(DMA_SLAVE, cap);
cfg.dev_type = dma_spec->args[0];
flags = dma_spec->args[2];
switch (D40_DT_FLAGS_MODE(flags)) {
case 0: cfg.mode = STEDMA40_MODE_LOGICAL; break;
case 1: cfg.mode = STEDMA40_MODE_PHYSICAL; break;
}
switch (D40_DT_FLAGS_DIR(flags)) {
case 0:
cfg.dir = DMA_MEM_TO_DEV;
cfg.dst_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
break;
case 1:
cfg.dir = DMA_DEV_TO_MEM;
cfg.src_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
break;
}
if (D40_DT_FLAGS_FIXED_CHAN(flags)) {
cfg.phy_channel = dma_spec->args[1];
cfg.use_fixed_channel = true;
}
if (D40_DT_FLAGS_HIGH_PRIO(flags))
cfg.high_priority = true;
return dma_request_channel(cap, stedma40_filter, &cfg);
}
/* DMA ENGINE functions */
static int d40_alloc_chan_resources(struct dma_chan *chan)
{
int err;
unsigned long flags;
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
bool is_free_phy;
spin_lock_irqsave(&d40c->lock, flags);
dma_cookie_init(chan);
/* If no dma configuration is set use default configuration (memcpy) */
if (!d40c->configured) {
err = d40_config_memcpy(d40c);
if (err) {
chan_err(d40c, "Failed to configure memcpy channel\n");
goto mark_last_busy;
}
}
err = d40_allocate_channel(d40c, &is_free_phy);
if (err) {
chan_err(d40c, "Failed to allocate channel\n");
d40c->configured = false;
goto mark_last_busy;
}
pm_runtime_get_sync(d40c->base->dev);
d40_set_prio_realtime(d40c);
if (chan_is_logical(d40c)) {
if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
d40c->lcpa = d40c->base->lcpa_base +
d40c->dma_cfg.dev_type * D40_LCPA_CHAN_SIZE;
else
d40c->lcpa = d40c->base->lcpa_base +
d40c->dma_cfg.dev_type *
D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA;
/* Unmask the Global Interrupt Mask. */
d40c->src_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
d40c->dst_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
}
dev_dbg(chan2dev(d40c), "allocated %s channel (phy %d%s)\n",
chan_is_logical(d40c) ? "logical" : "physical",
d40c->phy_chan->num,
d40c->dma_cfg.use_fixed_channel ? ", fixed" : "");
/*
* Only write channel configuration to the DMA if the physical
* resource is free. In case of multiple logical channels
* on the same physical resource, only the first write is necessary.
*/
if (is_free_phy)
d40_config_write(d40c);
mark_last_busy:
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
spin_unlock_irqrestore(&d40c->lock, flags);
return err;
}
static void d40_free_chan_resources(struct dma_chan *chan)
{
struct d40_chan *d40c =
container_of(chan, struct d40_chan, chan);
int err;
unsigned long flags;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Cannot free unallocated channel\n");
return;
}
spin_lock_irqsave(&d40c->lock, flags);
err = d40_free_dma(d40c);
if (err)
chan_err(d40c, "Failed to free channel\n");
spin_unlock_irqrestore(&d40c->lock, flags);
}
static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
dma_addr_t dst,
dma_addr_t src,
size_t size,
unsigned long dma_flags)
{
struct scatterlist dst_sg;
struct scatterlist src_sg;
sg_init_table(&dst_sg, 1);
sg_init_table(&src_sg, 1);
sg_dma_address(&dst_sg) = dst;
sg_dma_address(&src_sg) = src;
sg_dma_len(&dst_sg) = size;
sg_dma_len(&src_sg) = size;
return d40_prep_sg(chan, &src_sg, &dst_sg, 1,
DMA_MEM_TO_MEM, dma_flags);
}
static struct dma_async_tx_descriptor *
d40_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long dma_flags, void *context)
{
if (!is_slave_direction(direction))
return NULL;
return d40_prep_sg(chan, sgl, sgl, sg_len, direction, dma_flags);
}
static struct dma_async_tx_descriptor *
dma40_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
size_t buf_len, size_t period_len,
enum dma_transfer_direction direction, unsigned long flags)
{
unsigned int periods = buf_len / period_len;
struct dma_async_tx_descriptor *txd;
struct scatterlist *sg;
int i;
sg = kcalloc(periods + 1, sizeof(struct scatterlist), GFP_NOWAIT);
if (!sg)
return NULL;
for (i = 0; i < periods; i++) {
sg_dma_address(&sg[i]) = dma_addr;
sg_dma_len(&sg[i]) = period_len;
dma_addr += period_len;
}
sg_chain(sg, periods + 1, sg);
txd = d40_prep_sg(chan, sg, sg, periods, direction,
DMA_PREP_INTERRUPT);
kfree(sg);
return txd;
}
static enum dma_status d40_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
enum dma_status ret;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Cannot read status of unallocated channel\n");
return -EINVAL;
}
ret = dma_cookie_status(chan, cookie, txstate);
if (ret != DMA_COMPLETE && txstate)
dma_set_residue(txstate, stedma40_residue(chan));
if (d40_is_paused(d40c))
ret = DMA_PAUSED;
return ret;
}
static void d40_issue_pending(struct dma_chan *chan)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
unsigned long flags;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Channel is not allocated!\n");
return;
}
spin_lock_irqsave(&d40c->lock, flags);
list_splice_tail_init(&d40c->pending_queue, &d40c->queue);
/* Busy means that queued jobs are already being processed */
if (!d40c->busy)
(void) d40_queue_start(d40c);
spin_unlock_irqrestore(&d40c->lock, flags);
}
static int d40_terminate_all(struct dma_chan *chan)
{
unsigned long flags;
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
int ret;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Channel is not allocated!\n");
return -EINVAL;
}
spin_lock_irqsave(&d40c->lock, flags);
pm_runtime_get_sync(d40c->base->dev);
ret = d40_channel_execute_command(d40c, D40_DMA_STOP);
if (ret)
chan_err(d40c, "Failed to stop channel\n");
d40_term_all(d40c);
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
if (d40c->busy) {
pm_runtime_mark_last_busy(d40c->base->dev);
pm_runtime_put_autosuspend(d40c->base->dev);
}
d40c->busy = false;
spin_unlock_irqrestore(&d40c->lock, flags);
return 0;
}
static int
dma40_config_to_halfchannel(struct d40_chan *d40c,
struct stedma40_half_channel_info *info,
u32 maxburst)
{
int psize;
if (chan_is_logical(d40c)) {
if (maxburst >= 16)
psize = STEDMA40_PSIZE_LOG_16;
else if (maxburst >= 8)
psize = STEDMA40_PSIZE_LOG_8;
else if (maxburst >= 4)
psize = STEDMA40_PSIZE_LOG_4;
else
psize = STEDMA40_PSIZE_LOG_1;
} else {
if (maxburst >= 16)
psize = STEDMA40_PSIZE_PHY_16;
else if (maxburst >= 8)
psize = STEDMA40_PSIZE_PHY_8;
else if (maxburst >= 4)
psize = STEDMA40_PSIZE_PHY_4;
else
psize = STEDMA40_PSIZE_PHY_1;
}
info->psize = psize;
info->flow_ctrl = STEDMA40_NO_FLOW_CTRL;
return 0;
}
static int d40_set_runtime_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
memcpy(&d40c->slave_config, config, sizeof(*config));
return 0;
}
/* Runtime reconfiguration extension */
static int d40_set_runtime_config_write(struct dma_chan *chan,
struct dma_slave_config *config,
enum dma_transfer_direction direction)
{
struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
struct stedma40_chan_cfg *cfg = &d40c->dma_cfg;
enum dma_slave_buswidth src_addr_width, dst_addr_width;
dma_addr_t config_addr;
u32 src_maxburst, dst_maxburst;
int ret;
if (d40c->phy_chan == NULL) {
chan_err(d40c, "Channel is not allocated!\n");
return -EINVAL;
}
src_addr_width = config->src_addr_width;
src_maxburst = config->src_maxburst;
dst_addr_width = config->dst_addr_width;
dst_maxburst = config->dst_maxburst;
if (direction == DMA_DEV_TO_MEM) {
config_addr = config->src_addr;
if (cfg->dir != DMA_DEV_TO_MEM)
dev_dbg(d40c->base->dev,
"channel was not configured for peripheral "
"to memory transfer (%d) overriding\n",
cfg->dir);
cfg->dir = DMA_DEV_TO_MEM;
/* Configure the memory side */
if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
dst_addr_width = src_addr_width;
if (dst_maxburst == 0)
dst_maxburst = src_maxburst;
} else if (direction == DMA_MEM_TO_DEV) {
config_addr = config->dst_addr;
if (cfg->dir != DMA_MEM_TO_DEV)
dev_dbg(d40c->base->dev,
"channel was not configured for memory "
"to peripheral transfer (%d) overriding\n",
cfg->dir);
cfg->dir = DMA_MEM_TO_DEV;
/* Configure the memory side */
if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
src_addr_width = dst_addr_width;
if (src_maxburst == 0)
src_maxburst = dst_maxburst;
} else {
dev_err(d40c->base->dev,
"unrecognized channel direction %d\n",
direction);
return -EINVAL;
}
if (config_addr <= 0) {
dev_err(d40c->base->dev, "no address supplied\n");
return -EINVAL;
}
if (src_maxburst * src_addr_width != dst_maxburst * dst_addr_width) {
dev_err(d40c->base->dev,
"src/dst width/maxburst mismatch: %d*%d != %d*%d\n",
src_maxburst,
src_addr_width,
dst_maxburst,
dst_addr_width);
return -EINVAL;
}
if (src_maxburst > 16) {
src_maxburst = 16;
dst_maxburst = src_maxburst * src_addr_width / dst_addr_width;
} else if (dst_maxburst > 16) {
dst_maxburst = 16;
src_maxburst = dst_maxburst * dst_addr_width / src_addr_width;
}
/* Only valid widths are; 1, 2, 4 and 8. */
if (src_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
src_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES ||
dst_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
dst_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES ||
!is_power_of_2(src_addr_width) ||
!is_power_of_2(dst_addr_width))
return -EINVAL;
cfg->src_info.data_width = src_addr_width;
cfg->dst_info.data_width = dst_addr_width;
ret = dma40_config_to_halfchannel(d40c, &cfg->src_info,
src_maxburst);
if (ret)
return ret;
ret = dma40_config_to_halfchannel(d40c, &cfg->dst_info,
dst_maxburst);
if (ret)
return ret;
/* Fill in register values */
if (chan_is_logical(d40c))
d40_log_cfg(cfg, &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
else
d40_phy_cfg(cfg, &d40c->src_def_cfg, &d40c->dst_def_cfg);
/* These settings will take precedence later */
d40c->runtime_addr = config_addr;
d40c->runtime_direction = direction;
dev_dbg(d40c->base->dev,
"configured channel %s for %s, data width %d/%d, "
"maxburst %d/%d elements, LE, no flow control\n",
dma_chan_name(chan),
(direction == DMA_DEV_TO_MEM) ? "RX" : "TX",
src_addr_width, dst_addr_width,
src_maxburst, dst_maxburst);
return 0;
}
/* Initialization functions */
static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma,
struct d40_chan *chans, int offset,
int num_chans)
{
int i = 0;
struct d40_chan *d40c;
INIT_LIST_HEAD(&dma->channels);
for (i = offset; i < offset + num_chans; i++) {
d40c = &chans[i];
d40c->base = base;
d40c->chan.device = dma;
spin_lock_init(&d40c->lock);
d40c->log_num = D40_PHY_CHAN;
INIT_LIST_HEAD(&d40c->done);
INIT_LIST_HEAD(&d40c->active);
INIT_LIST_HEAD(&d40c->queue);
INIT_LIST_HEAD(&d40c->pending_queue);
INIT_LIST_HEAD(&d40c->client);
INIT_LIST_HEAD(&d40c->prepare_queue);
tasklet_setup(&d40c->tasklet, dma_tasklet);
list_add_tail(&d40c->chan.device_node,
&dma->channels);
}
}
static void d40_ops_init(struct d40_base *base, struct dma_device *dev)
{
if (dma_has_cap(DMA_SLAVE, dev->cap_mask)) {
dev->device_prep_slave_sg = d40_prep_slave_sg;
dev->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
}
if (dma_has_cap(DMA_MEMCPY, dev->cap_mask)) {
dev->device_prep_dma_memcpy = d40_prep_memcpy;
dev->directions = BIT(DMA_MEM_TO_MEM);
/*
* This controller can only access address at even
* 32bit boundaries, i.e. 2^2
*/
dev->copy_align = DMAENGINE_ALIGN_4_BYTES;
}
if (dma_has_cap(DMA_CYCLIC, dev->cap_mask))
dev->device_prep_dma_cyclic = dma40_prep_dma_cyclic;
dev->device_alloc_chan_resources = d40_alloc_chan_resources;
dev->device_free_chan_resources = d40_free_chan_resources;
dev->device_issue_pending = d40_issue_pending;
dev->device_tx_status = d40_tx_status;
dev->device_config = d40_set_runtime_config;
dev->device_pause = d40_pause;
dev->device_resume = d40_resume;
dev->device_terminate_all = d40_terminate_all;
dev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
dev->dev = base->dev;
}
static int __init d40_dmaengine_init(struct d40_base *base,
int num_reserved_chans)
{
int err ;
d40_chan_init(base, &base->dma_slave, base->log_chans,
0, base->num_log_chans);
dma_cap_zero(base->dma_slave.cap_mask);
dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask);
dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
d40_ops_init(base, &base->dma_slave);
err = dmaenginem_async_device_register(&base->dma_slave);
if (err) {
d40_err(base->dev, "Failed to register slave channels\n");
goto exit;
}
d40_chan_init(base, &base->dma_memcpy, base->log_chans,
base->num_log_chans, base->num_memcpy_chans);
dma_cap_zero(base->dma_memcpy.cap_mask);
dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
d40_ops_init(base, &base->dma_memcpy);
err = dmaenginem_async_device_register(&base->dma_memcpy);
if (err) {
d40_err(base->dev,
"Failed to register memcpy only channels\n");
goto exit;
}
d40_chan_init(base, &base->dma_both, base->phy_chans,
0, num_reserved_chans);
dma_cap_zero(base->dma_both.cap_mask);
dma_cap_set(DMA_SLAVE, base->dma_both.cap_mask);
dma_cap_set(DMA_MEMCPY, base->dma_both.cap_mask);
dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
d40_ops_init(base, &base->dma_both);
err = dmaenginem_async_device_register(&base->dma_both);
if (err) {
d40_err(base->dev,
"Failed to register logical and physical capable channels\n");
goto exit;
}
return 0;
exit:
return err;
}
/* Suspend resume functionality */
#ifdef CONFIG_PM_SLEEP
static int dma40_suspend(struct device *dev)
{
struct d40_base *base = dev_get_drvdata(dev);
int ret;
ret = pm_runtime_force_suspend(dev);
if (ret)
return ret;
if (base->lcpa_regulator)
ret = regulator_disable(base->lcpa_regulator);
return ret;
}
static int dma40_resume(struct device *dev)
{
struct d40_base *base = dev_get_drvdata(dev);
int ret = 0;
if (base->lcpa_regulator) {
ret = regulator_enable(base->lcpa_regulator);
if (ret)
return ret;
}
return pm_runtime_force_resume(dev);
}
#endif
#ifdef CONFIG_PM
static void dma40_backup(void __iomem *baseaddr, u32 *backup,
u32 *regaddr, int num, bool save)
{
int i;
for (i = 0; i < num; i++) {
void __iomem *addr = baseaddr + regaddr[i];
if (save)
backup[i] = readl_relaxed(addr);
else
writel_relaxed(backup[i], addr);
}
}
static void d40_save_restore_registers(struct d40_base *base, bool save)
{
int i;
/* Save/Restore channel specific registers */
for (i = 0; i < base->num_phy_chans; i++) {
void __iomem *addr;
int idx;
if (base->phy_res[i].reserved)
continue;
addr = base->virtbase + D40_DREG_PCBASE + i * D40_DREG_PCDELTA;
idx = i * ARRAY_SIZE(d40_backup_regs_chan);
dma40_backup(addr, &base->reg_val_backup_chan[idx],
d40_backup_regs_chan,
ARRAY_SIZE(d40_backup_regs_chan),
save);
}
/* Save/Restore global registers */
dma40_backup(base->virtbase, base->reg_val_backup,
d40_backup_regs, ARRAY_SIZE(d40_backup_regs),
save);
/* Save/Restore registers only existing on dma40 v3 and later */
if (base->gen_dmac.backup)
dma40_backup(base->virtbase, base->reg_val_backup_v4,
base->gen_dmac.backup,
base->gen_dmac.backup_size,
save);
}
static int dma40_runtime_suspend(struct device *dev)
{
struct d40_base *base = dev_get_drvdata(dev);
d40_save_restore_registers(base, true);
/* Don't disable/enable clocks for v1 due to HW bugs */
if (base->rev != 1)
writel_relaxed(base->gcc_pwr_off_mask,
base->virtbase + D40_DREG_GCC);
return 0;
}
static int dma40_runtime_resume(struct device *dev)
{
struct d40_base *base = dev_get_drvdata(dev);
d40_save_restore_registers(base, false);
writel_relaxed(D40_DREG_GCC_ENABLE_ALL,
base->virtbase + D40_DREG_GCC);
return 0;
}
#endif
static const struct dev_pm_ops dma40_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(dma40_suspend, dma40_resume)
SET_RUNTIME_PM_OPS(dma40_runtime_suspend,
dma40_runtime_resume,
NULL)
};
/* Initialization functions. */
static int __init d40_phy_res_init(struct d40_base *base)
{
int i;
int num_phy_chans_avail = 0;
u32 val[2];
int odd_even_bit = -2;
int gcc = D40_DREG_GCC_ENA;
val[0] = readl(base->virtbase + D40_DREG_PRSME);
val[1] = readl(base->virtbase + D40_DREG_PRSMO);
for (i = 0; i < base->num_phy_chans; i++) {
base->phy_res[i].num = i;
odd_even_bit += 2 * ((i % 2) == 0);
if (((val[i % 2] >> odd_even_bit) & 3) == 1) {
/* Mark security only channels as occupied */
base->phy_res[i].allocated_src = D40_ALLOC_PHY;
base->phy_res[i].allocated_dst = D40_ALLOC_PHY;
base->phy_res[i].reserved = true;
gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i),
D40_DREG_GCC_SRC);
gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i),
D40_DREG_GCC_DST);
} else {
base->phy_res[i].allocated_src = D40_ALLOC_FREE;
base->phy_res[i].allocated_dst = D40_ALLOC_FREE;
base->phy_res[i].reserved = false;
num_phy_chans_avail++;
}
spin_lock_init(&base->phy_res[i].lock);
}
/* Mark disabled channels as occupied */
for (i = 0; base->plat_data->disabled_channels[i] != -1; i++) {
int chan = base->plat_data->disabled_channels[i];
base->phy_res[chan].allocated_src = D40_ALLOC_PHY;
base->phy_res[chan].allocated_dst = D40_ALLOC_PHY;
base->phy_res[chan].reserved = true;
gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan),
D40_DREG_GCC_SRC);
gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan),
D40_DREG_GCC_DST);
num_phy_chans_avail--;
}
/* Mark soft_lli channels */
for (i = 0; i < base->plat_data->num_of_soft_lli_chans; i++) {
int chan = base->plat_data->soft_lli_chans[i];
base->phy_res[chan].use_soft_lli = true;
}
dev_info(base->dev, "%d of %d physical DMA channels available\n",
num_phy_chans_avail, base->num_phy_chans);
/* Verify settings extended vs standard */
val[0] = readl(base->virtbase + D40_DREG_PRTYP);
for (i = 0; i < base->num_phy_chans; i++) {
if (base->phy_res[i].allocated_src == D40_ALLOC_FREE &&
(val[0] & 0x3) != 1)
dev_info(base->dev,
"[%s] INFO: channel %d is misconfigured (%d)\n",
__func__, i, val[0] & 0x3);
val[0] = val[0] >> 2;
}
/*
* To keep things simple, Enable all clocks initially.
* The clocks will get managed later post channel allocation.
* The clocks for the event lines on which reserved channels exists
* are not managed here.
*/
writel(D40_DREG_GCC_ENABLE_ALL, base->virtbase + D40_DREG_GCC);
base->gcc_pwr_off_mask = gcc;
return num_phy_chans_avail;
}
/* Called from the registered devm action */
static void d40_drop_kmem_cache_action(void *d)
{
struct kmem_cache *desc_slab = d;
kmem_cache_destroy(desc_slab);
}
static int __init d40_hw_detect_init(struct platform_device *pdev,
struct d40_base **retbase)
{
struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev);
struct device *dev = &pdev->dev;
struct clk *clk;
void __iomem *virtbase;
struct d40_base *base;
int num_log_chans;
int num_phy_chans;
int num_memcpy_chans;
int i;
u32 pid;
u32 cid;
u8 rev;
int ret;
clk = devm_clk_get_enabled(dev, NULL);
if (IS_ERR(clk))
return PTR_ERR(clk);
/* Get IO for DMAC base address */
virtbase = devm_platform_ioremap_resource_byname(pdev, "base");
if (IS_ERR(virtbase))
return PTR_ERR(virtbase);
/* This is just a regular AMBA PrimeCell ID actually */
for (pid = 0, i = 0; i < 4; i++)
pid |= (readl(virtbase + SZ_4K - 0x20 + 4 * i)
& 255) << (i * 8);
for (cid = 0, i = 0; i < 4; i++)
cid |= (readl(virtbase + SZ_4K - 0x10 + 4 * i)
& 255) << (i * 8);
if (cid != AMBA_CID) {
d40_err(dev, "Unknown hardware! No PrimeCell ID\n");
return -EINVAL;
}
if (AMBA_MANF_BITS(pid) != AMBA_VENDOR_ST) {
d40_err(dev, "Unknown designer! Got %x wanted %x\n",
AMBA_MANF_BITS(pid),
AMBA_VENDOR_ST);
return -EINVAL;
}
/*
* HW revision:
* DB8500ed has revision 0
* ? has revision 1
* DB8500v1 has revision 2
* DB8500v2 has revision 3
* AP9540v1 has revision 4
* DB8540v1 has revision 4
*/
rev = AMBA_REV_BITS(pid);
if (rev < 2) {
d40_err(dev, "hardware revision: %d is not supported", rev);
return -EINVAL;
}
/* The number of physical channels on this HW */
if (plat_data->num_of_phy_chans)
num_phy_chans = plat_data->num_of_phy_chans;
else
num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
/* The number of channels used for memcpy */
if (plat_data->num_of_memcpy_chans)
num_memcpy_chans = plat_data->num_of_memcpy_chans;
else
num_memcpy_chans = ARRAY_SIZE(dma40_memcpy_channels);
num_log_chans = num_phy_chans * D40_MAX_LOG_CHAN_PER_PHY;
dev_info(dev,
"hardware rev: %d with %d physical and %d logical channels\n",
rev, num_phy_chans, num_log_chans);
base = devm_kzalloc(dev,
ALIGN(sizeof(struct d40_base), 4) +
(num_phy_chans + num_log_chans + num_memcpy_chans) *
sizeof(struct d40_chan), GFP_KERNEL);
if (!base)
return -ENOMEM;
base->rev = rev;
base->clk = clk;
base->num_memcpy_chans = num_memcpy_chans;
base->num_phy_chans = num_phy_chans;
base->num_log_chans = num_log_chans;
base->virtbase = virtbase;
base->plat_data = plat_data;
base->dev = dev;
base->phy_chans = ((void *)base) + ALIGN(sizeof(struct d40_base), 4);
base->log_chans = &base->phy_chans[num_phy_chans];
if (base->plat_data->num_of_phy_chans == 14) {
base->gen_dmac.backup = d40_backup_regs_v4b;
base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4B;
base->gen_dmac.interrupt_en = D40_DREG_CPCMIS;
base->gen_dmac.interrupt_clear = D40_DREG_CPCICR;
base->gen_dmac.realtime_en = D40_DREG_CRSEG1;
base->gen_dmac.realtime_clear = D40_DREG_CRCEG1;
base->gen_dmac.high_prio_en = D40_DREG_CPSEG1;
base->gen_dmac.high_prio_clear = D40_DREG_CPCEG1;
base->gen_dmac.il = il_v4b;
base->gen_dmac.il_size = ARRAY_SIZE(il_v4b);
base->gen_dmac.init_reg = dma_init_reg_v4b;
base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4b);
} else {
if (base->rev >= 3) {
base->gen_dmac.backup = d40_backup_regs_v4a;
base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4A;
}
base->gen_dmac.interrupt_en = D40_DREG_PCMIS;
base->gen_dmac.interrupt_clear = D40_DREG_PCICR;
base->gen_dmac.realtime_en = D40_DREG_RSEG1;
base->gen_dmac.realtime_clear = D40_DREG_RCEG1;
base->gen_dmac.high_prio_en = D40_DREG_PSEG1;
base->gen_dmac.high_prio_clear = D40_DREG_PCEG1;
base->gen_dmac.il = il_v4a;
base->gen_dmac.il_size = ARRAY_SIZE(il_v4a);
base->gen_dmac.init_reg = dma_init_reg_v4a;
base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4a);
}
base->phy_res = devm_kcalloc(dev, num_phy_chans,
sizeof(*base->phy_res),
GFP_KERNEL);
if (!base->phy_res)
return -ENOMEM;
base->lookup_phy_chans = devm_kcalloc(dev, num_phy_chans,
sizeof(*base->lookup_phy_chans),
GFP_KERNEL);
if (!base->lookup_phy_chans)
return -ENOMEM;
base->lookup_log_chans = devm_kcalloc(dev, num_log_chans,
sizeof(*base->lookup_log_chans),
GFP_KERNEL);
if (!base->lookup_log_chans)
return -ENOMEM;
base->reg_val_backup_chan = devm_kmalloc_array(dev, base->num_phy_chans,
sizeof(d40_backup_regs_chan),
GFP_KERNEL);
if (!base->reg_val_backup_chan)
return -ENOMEM;
base->lcla_pool.alloc_map = devm_kcalloc(dev, num_phy_chans
* D40_LCLA_LINK_PER_EVENT_GRP,
sizeof(*base->lcla_pool.alloc_map),
GFP_KERNEL);
if (!base->lcla_pool.alloc_map)
return -ENOMEM;
base->regs_interrupt = devm_kmalloc_array(dev, base->gen_dmac.il_size,
sizeof(*base->regs_interrupt),
GFP_KERNEL);
if (!base->regs_interrupt)
return -ENOMEM;
base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc),
0, SLAB_HWCACHE_ALIGN,
NULL);
if (!base->desc_slab)
return -ENOMEM;
ret = devm_add_action_or_reset(dev, d40_drop_kmem_cache_action,
base->desc_slab);
if (ret)
return ret;
*retbase = base;
return 0;
}
static void __init d40_hw_init(struct d40_base *base)
{
int i;
u32 prmseo[2] = {0, 0};
u32 activeo[2] = {0xFFFFFFFF, 0xFFFFFFFF};
u32 pcmis = 0;
u32 pcicr = 0;
struct d40_reg_val *dma_init_reg = base->gen_dmac.init_reg;
u32 reg_size = base->gen_dmac.init_reg_size;
for (i = 0; i < reg_size; i++)
writel(dma_init_reg[i].val,
base->virtbase + dma_init_reg[i].reg);
/* Configure all our dma channels to default settings */
for (i = 0; i < base->num_phy_chans; i++) {
activeo[i % 2] = activeo[i % 2] << 2;
if (base->phy_res[base->num_phy_chans - i - 1].allocated_src
== D40_ALLOC_PHY) {
activeo[i % 2] |= 3;
continue;
}
/* Enable interrupt # */
pcmis = (pcmis << 1) | 1;
/* Clear interrupt # */
pcicr = (pcicr << 1) | 1;
/* Set channel to physical mode */
prmseo[i % 2] = prmseo[i % 2] << 2;
prmseo[i % 2] |= 1;
}
writel(prmseo[1], base->virtbase + D40_DREG_PRMSE);
writel(prmseo[0], base->virtbase + D40_DREG_PRMSO);
writel(activeo[1], base->virtbase + D40_DREG_ACTIVE);
writel(activeo[0], base->virtbase + D40_DREG_ACTIVO);
/* Write which interrupt to enable */
writel(pcmis, base->virtbase + base->gen_dmac.interrupt_en);
/* Write which interrupt to clear */
writel(pcicr, base->virtbase + base->gen_dmac.interrupt_clear);
/* These are __initdata and cannot be accessed after init */
base->gen_dmac.init_reg = NULL;
base->gen_dmac.init_reg_size = 0;
}
static int __init d40_lcla_allocate(struct d40_base *base)
{
struct d40_lcla_pool *pool = &base->lcla_pool;
unsigned long *page_list;
int i, j;
int ret;
/*
* This is somewhat ugly. We need 8192 bytes that are 18 bit aligned,
* To full fill this hardware requirement without wasting 256 kb
* we allocate pages until we get an aligned one.
*/
page_list = kmalloc_array(MAX_LCLA_ALLOC_ATTEMPTS,
sizeof(*page_list),
GFP_KERNEL);
if (!page_list)
return -ENOMEM;
/* Calculating how many pages that are required */
base->lcla_pool.pages = SZ_1K * base->num_phy_chans / PAGE_SIZE;
for (i = 0; i < MAX_LCLA_ALLOC_ATTEMPTS; i++) {
page_list[i] = __get_free_pages(GFP_KERNEL,
base->lcla_pool.pages);
if (!page_list[i]) {
d40_err(base->dev, "Failed to allocate %d pages.\n",
base->lcla_pool.pages);
ret = -ENOMEM;
for (j = 0; j < i; j++)
free_pages(page_list[j], base->lcla_pool.pages);
goto free_page_list;
}
if ((virt_to_phys((void *)page_list[i]) &
(LCLA_ALIGNMENT - 1)) == 0)
break;
}
for (j = 0; j < i; j++)
free_pages(page_list[j], base->lcla_pool.pages);
if (i < MAX_LCLA_ALLOC_ATTEMPTS) {
base->lcla_pool.base = (void *)page_list[i];
} else {
/*
* After many attempts and no succees with finding the correct
* alignment, try with allocating a big buffer.
*/
dev_warn(base->dev,
"[%s] Failed to get %d pages @ 18 bit align.\n",
__func__, base->lcla_pool.pages);
base->lcla_pool.base_unaligned = kmalloc(SZ_1K *
base->num_phy_chans +
LCLA_ALIGNMENT,
GFP_KERNEL);
if (!base->lcla_pool.base_unaligned) {
ret = -ENOMEM;
goto free_page_list;
}
base->lcla_pool.base = PTR_ALIGN(base->lcla_pool.base_unaligned,
LCLA_ALIGNMENT);
}
pool->dma_addr = dma_map_single(base->dev, pool->base,
SZ_1K * base->num_phy_chans,
DMA_TO_DEVICE);
if (dma_mapping_error(base->dev, pool->dma_addr)) {
pool->dma_addr = 0;
ret = -ENOMEM;
goto free_page_list;
}
writel(virt_to_phys(base->lcla_pool.base),
base->virtbase + D40_DREG_LCLA);
ret = 0;
free_page_list:
kfree(page_list);
return ret;
}
static int __init d40_of_probe(struct device *dev,
struct device_node *np)
{
struct stedma40_platform_data *pdata;
int num_phy = 0, num_memcpy = 0, num_disabled = 0;
const __be32 *list;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
/* If absent this value will be obtained from h/w. */
of_property_read_u32(np, "dma-channels", &num_phy);
if (num_phy > 0)
pdata->num_of_phy_chans = num_phy;
list = of_get_property(np, "memcpy-channels", &num_memcpy);
num_memcpy /= sizeof(*list);
if (num_memcpy > D40_MEMCPY_MAX_CHANS || num_memcpy <= 0) {
d40_err(dev,
"Invalid number of memcpy channels specified (%d)\n",
num_memcpy);
return -EINVAL;
}
pdata->num_of_memcpy_chans = num_memcpy;
of_property_read_u32_array(np, "memcpy-channels",
dma40_memcpy_channels,
num_memcpy);
list = of_get_property(np, "disabled-channels", &num_disabled);
num_disabled /= sizeof(*list);
if (num_disabled >= STEDMA40_MAX_PHYS || num_disabled < 0) {
d40_err(dev,
"Invalid number of disabled channels specified (%d)\n",
num_disabled);
return -EINVAL;
}
of_property_read_u32_array(np, "disabled-channels",
pdata->disabled_channels,
num_disabled);
pdata->disabled_channels[num_disabled] = -1;
dev->platform_data = pdata;
return 0;
}
static int __init d40_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node;
struct device_node *np_lcpa;
struct d40_base *base;
struct resource *res;
struct resource res_lcpa;
int num_reserved_chans;
u32 val;
int ret;
if (d40_of_probe(dev, np)) {
ret = -ENOMEM;
goto report_failure;
}
ret = d40_hw_detect_init(pdev, &base);
if (ret)
goto report_failure;
num_reserved_chans = d40_phy_res_init(base);
platform_set_drvdata(pdev, base);
spin_lock_init(&base->interrupt_lock);
spin_lock_init(&base->execmd_lock);
/* Get IO for logical channel parameter address (LCPA) */
np_lcpa = of_parse_phandle(np, "sram", 0);
if (!np_lcpa) {
dev_err(dev, "no LCPA SRAM node\n");
ret = -EINVAL;
goto report_failure;
}
/* This is no device so read the address directly from the node */
ret = of_address_to_resource(np_lcpa, 0, &res_lcpa);
if (ret) {
dev_err(dev, "no LCPA SRAM resource\n");
goto report_failure;
}
base->lcpa_size = resource_size(&res_lcpa);
base->phy_lcpa = res_lcpa.start;
dev_info(dev, "found LCPA SRAM at %pad, size %pa\n",
&base->phy_lcpa, &base->lcpa_size);
/* We make use of ESRAM memory for this. */
val = readl(base->virtbase + D40_DREG_LCPA);
if (base->phy_lcpa != val && val != 0) {
dev_warn(dev,
"[%s] Mismatch LCPA dma 0x%x, def %08x\n",
__func__, val, (u32)base->phy_lcpa);
} else
writel(base->phy_lcpa, base->virtbase + D40_DREG_LCPA);
base->lcpa_base = devm_ioremap(dev, base->phy_lcpa, base->lcpa_size);
if (!base->lcpa_base) {
ret = -ENOMEM;
d40_err(dev, "Failed to ioremap LCPA region\n");
goto report_failure;
}
/* If lcla has to be located in ESRAM we don't need to allocate */
if (base->plat_data->use_esram_lcla) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"lcla_esram");
if (!res) {
ret = -ENOENT;
d40_err(dev,
"No \"lcla_esram\" memory resource\n");
goto report_failure;
}
base->lcla_pool.base = devm_ioremap(dev, res->start,
resource_size(res));
if (!base->lcla_pool.base) {
ret = -ENOMEM;
d40_err(dev, "Failed to ioremap LCLA region\n");
goto report_failure;
}
writel(res->start, base->virtbase + D40_DREG_LCLA);
} else {
ret = d40_lcla_allocate(base);
if (ret) {
d40_err(dev, "Failed to allocate LCLA area\n");
goto destroy_cache;
}
}
spin_lock_init(&base->lcla_pool.lock);
base->irq = platform_get_irq(pdev, 0);
if (base->irq < 0) {
ret = base->irq;
goto destroy_cache;
}
ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base);
if (ret) {
d40_err(dev, "No IRQ defined\n");
goto destroy_cache;
}
if (base->plat_data->use_esram_lcla) {
base->lcpa_regulator = regulator_get(base->dev, "lcla_esram");
if (IS_ERR(base->lcpa_regulator)) {
d40_err(dev, "Failed to get lcpa_regulator\n");
ret = PTR_ERR(base->lcpa_regulator);
base->lcpa_regulator = NULL;
goto destroy_cache;
}
ret = regulator_enable(base->lcpa_regulator);
if (ret) {
d40_err(dev,
"Failed to enable lcpa_regulator\n");
regulator_put(base->lcpa_regulator);
base->lcpa_regulator = NULL;
goto destroy_cache;
}
}
writel_relaxed(D40_DREG_GCC_ENABLE_ALL, base->virtbase + D40_DREG_GCC);
pm_runtime_irq_safe(base->dev);
pm_runtime_set_autosuspend_delay(base->dev, DMA40_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(base->dev);
pm_runtime_mark_last_busy(base->dev);
pm_runtime_set_active(base->dev);
pm_runtime_enable(base->dev);
ret = d40_dmaengine_init(base, num_reserved_chans);
if (ret)
goto destroy_cache;
ret = dma_set_max_seg_size(base->dev, STEDMA40_MAX_SEG_SIZE);
if (ret) {
d40_err(dev, "Failed to set dma max seg size\n");
goto destroy_cache;
}
d40_hw_init(base);
ret = of_dma_controller_register(np, d40_xlate, NULL);
if (ret) {
dev_err(dev,
"could not register of_dma_controller\n");
goto destroy_cache;
}
dev_info(base->dev, "initialized\n");
return 0;
destroy_cache:
if (base->lcla_pool.dma_addr)
dma_unmap_single(base->dev, base->lcla_pool.dma_addr,
SZ_1K * base->num_phy_chans,
DMA_TO_DEVICE);
if (!base->lcla_pool.base_unaligned && base->lcla_pool.base)
free_pages((unsigned long)base->lcla_pool.base,
base->lcla_pool.pages);
kfree(base->lcla_pool.base_unaligned);
if (base->lcpa_regulator) {
regulator_disable(base->lcpa_regulator);
regulator_put(base->lcpa_regulator);
}
report_failure:
d40_err(dev, "probe failed\n");
return ret;
}
static const struct of_device_id d40_match[] = {
{ .compatible = "stericsson,dma40", },
{}
};
static struct platform_driver d40_driver = {
.driver = {
.name = D40_NAME,
.pm = &dma40_pm_ops,
.of_match_table = d40_match,
},
};
static int __init stedma40_init(void)
{
return platform_driver_probe(&d40_driver, d40_probe);
}
subsys_initcall(stedma40_init);
| linux-master | drivers/dma/ste_dma40.c |
/*
* drivers/dma/fsl_raid.c
*
* Freescale RAID Engine device driver
*
* Author:
* Harninder Rai <[email protected]>
* Naveen Burmi <[email protected]>
*
* Rewrite:
* Xuelin Shi <[email protected]>
*
* Copyright (c) 2010-2014 Freescale Semiconductor, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Freescale Semiconductor nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") as published by the Free Software
* Foundation, either version 2 of that License or (at your option) any
* later version.
*
* THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Theory of operation:
*
* General capabilities:
* RAID Engine (RE) block is capable of offloading XOR, memcpy and P/Q
* calculations required in RAID5 and RAID6 operations. RE driver
* registers with Linux's ASYNC layer as dma driver. RE hardware
* maintains strict ordering of the requests through chained
* command queueing.
*
* Data flow:
* Software RAID layer of Linux (MD layer) maintains RAID partitions,
* strips, stripes etc. It sends requests to the underlying ASYNC layer
* which further passes it to RE driver. ASYNC layer decides which request
* goes to which job ring of RE hardware. For every request processed by
* RAID Engine, driver gets an interrupt unless coalescing is set. The
* per job ring interrupt handler checks the status register for errors,
* clears the interrupt and leave the post interrupt processing to the irq
* thread.
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/dmaengine.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include "dmaengine.h"
#include "fsl_raid.h"
#define FSL_RE_MAX_XOR_SRCS 16
#define FSL_RE_MAX_PQ_SRCS 16
#define FSL_RE_MIN_DESCS 256
#define FSL_RE_MAX_DESCS (4 * FSL_RE_MIN_DESCS)
#define FSL_RE_FRAME_FORMAT 0x1
#define FSL_RE_MAX_DATA_LEN (1024*1024)
#define to_fsl_re_dma_desc(tx) container_of(tx, struct fsl_re_desc, async_tx)
/* Add descriptors into per chan software queue - submit_q */
static dma_cookie_t fsl_re_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct fsl_re_desc *desc;
struct fsl_re_chan *re_chan;
dma_cookie_t cookie;
unsigned long flags;
desc = to_fsl_re_dma_desc(tx);
re_chan = container_of(tx->chan, struct fsl_re_chan, chan);
spin_lock_irqsave(&re_chan->desc_lock, flags);
cookie = dma_cookie_assign(tx);
list_add_tail(&desc->node, &re_chan->submit_q);
spin_unlock_irqrestore(&re_chan->desc_lock, flags);
return cookie;
}
/* Copy descriptor from per chan software queue into hardware job ring */
static void fsl_re_issue_pending(struct dma_chan *chan)
{
struct fsl_re_chan *re_chan;
int avail;
struct fsl_re_desc *desc, *_desc;
unsigned long flags;
re_chan = container_of(chan, struct fsl_re_chan, chan);
spin_lock_irqsave(&re_chan->desc_lock, flags);
avail = FSL_RE_SLOT_AVAIL(
in_be32(&re_chan->jrregs->inbring_slot_avail));
list_for_each_entry_safe(desc, _desc, &re_chan->submit_q, node) {
if (!avail)
break;
list_move_tail(&desc->node, &re_chan->active_q);
memcpy(&re_chan->inb_ring_virt_addr[re_chan->inb_count],
&desc->hwdesc, sizeof(struct fsl_re_hw_desc));
re_chan->inb_count = (re_chan->inb_count + 1) &
FSL_RE_RING_SIZE_MASK;
out_be32(&re_chan->jrregs->inbring_add_job, FSL_RE_ADD_JOB(1));
avail--;
}
spin_unlock_irqrestore(&re_chan->desc_lock, flags);
}
static void fsl_re_desc_done(struct fsl_re_desc *desc)
{
dma_cookie_complete(&desc->async_tx);
dma_descriptor_unmap(&desc->async_tx);
dmaengine_desc_get_callback_invoke(&desc->async_tx, NULL);
}
static void fsl_re_cleanup_descs(struct fsl_re_chan *re_chan)
{
struct fsl_re_desc *desc, *_desc;
unsigned long flags;
spin_lock_irqsave(&re_chan->desc_lock, flags);
list_for_each_entry_safe(desc, _desc, &re_chan->ack_q, node) {
if (async_tx_test_ack(&desc->async_tx))
list_move_tail(&desc->node, &re_chan->free_q);
}
spin_unlock_irqrestore(&re_chan->desc_lock, flags);
fsl_re_issue_pending(&re_chan->chan);
}
static void fsl_re_dequeue(struct tasklet_struct *t)
{
struct fsl_re_chan *re_chan = from_tasklet(re_chan, t, irqtask);
struct fsl_re_desc *desc, *_desc;
struct fsl_re_hw_desc *hwdesc;
unsigned long flags;
unsigned int count, oub_count;
int found;
fsl_re_cleanup_descs(re_chan);
spin_lock_irqsave(&re_chan->desc_lock, flags);
count = FSL_RE_SLOT_FULL(in_be32(&re_chan->jrregs->oubring_slot_full));
while (count--) {
found = 0;
hwdesc = &re_chan->oub_ring_virt_addr[re_chan->oub_count];
list_for_each_entry_safe(desc, _desc, &re_chan->active_q,
node) {
/* compare the hw dma addr to find the completed */
if (desc->hwdesc.lbea32 == hwdesc->lbea32 &&
desc->hwdesc.addr_low == hwdesc->addr_low) {
found = 1;
break;
}
}
if (found) {
fsl_re_desc_done(desc);
list_move_tail(&desc->node, &re_chan->ack_q);
} else {
dev_err(re_chan->dev,
"found hwdesc not in sw queue, discard it\n");
}
oub_count = (re_chan->oub_count + 1) & FSL_RE_RING_SIZE_MASK;
re_chan->oub_count = oub_count;
out_be32(&re_chan->jrregs->oubring_job_rmvd,
FSL_RE_RMVD_JOB(1));
}
spin_unlock_irqrestore(&re_chan->desc_lock, flags);
}
/* Per Job Ring interrupt handler */
static irqreturn_t fsl_re_isr(int irq, void *data)
{
struct fsl_re_chan *re_chan;
u32 irqstate, status;
re_chan = dev_get_drvdata((struct device *)data);
irqstate = in_be32(&re_chan->jrregs->jr_interrupt_status);
if (!irqstate)
return IRQ_NONE;
/*
* There's no way in upper layer (read MD layer) to recover from
* error conditions except restart everything. In long term we
* need to do something more than just crashing
*/
if (irqstate & FSL_RE_ERROR) {
status = in_be32(&re_chan->jrregs->jr_status);
dev_err(re_chan->dev, "chan error irqstate: %x, status: %x\n",
irqstate, status);
}
/* Clear interrupt */
out_be32(&re_chan->jrregs->jr_interrupt_status, FSL_RE_CLR_INTR);
tasklet_schedule(&re_chan->irqtask);
return IRQ_HANDLED;
}
static enum dma_status fsl_re_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(chan, cookie, txstate);
}
static void fill_cfd_frame(struct fsl_re_cmpnd_frame *cf, u8 index,
size_t length, dma_addr_t addr, bool final)
{
u32 efrl = length & FSL_RE_CF_LENGTH_MASK;
efrl |= final << FSL_RE_CF_FINAL_SHIFT;
cf[index].efrl32 = efrl;
cf[index].addr_high = upper_32_bits(addr);
cf[index].addr_low = lower_32_bits(addr);
}
static struct fsl_re_desc *fsl_re_init_desc(struct fsl_re_chan *re_chan,
struct fsl_re_desc *desc,
void *cf, dma_addr_t paddr)
{
desc->re_chan = re_chan;
desc->async_tx.tx_submit = fsl_re_tx_submit;
dma_async_tx_descriptor_init(&desc->async_tx, &re_chan->chan);
INIT_LIST_HEAD(&desc->node);
desc->hwdesc.fmt32 = FSL_RE_FRAME_FORMAT << FSL_RE_HWDESC_FMT_SHIFT;
desc->hwdesc.lbea32 = upper_32_bits(paddr);
desc->hwdesc.addr_low = lower_32_bits(paddr);
desc->cf_addr = cf;
desc->cf_paddr = paddr;
desc->cdb_addr = (void *)(cf + FSL_RE_CF_DESC_SIZE);
desc->cdb_paddr = paddr + FSL_RE_CF_DESC_SIZE;
return desc;
}
static struct fsl_re_desc *fsl_re_chan_alloc_desc(struct fsl_re_chan *re_chan,
unsigned long flags)
{
struct fsl_re_desc *desc = NULL;
void *cf;
dma_addr_t paddr;
unsigned long lock_flag;
fsl_re_cleanup_descs(re_chan);
spin_lock_irqsave(&re_chan->desc_lock, lock_flag);
if (!list_empty(&re_chan->free_q)) {
/* take one desc from free_q */
desc = list_first_entry(&re_chan->free_q,
struct fsl_re_desc, node);
list_del(&desc->node);
desc->async_tx.flags = flags;
}
spin_unlock_irqrestore(&re_chan->desc_lock, lock_flag);
if (!desc) {
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
cf = dma_pool_alloc(re_chan->re_dev->cf_desc_pool, GFP_NOWAIT,
&paddr);
if (!cf) {
kfree(desc);
return NULL;
}
desc = fsl_re_init_desc(re_chan, desc, cf, paddr);
desc->async_tx.flags = flags;
spin_lock_irqsave(&re_chan->desc_lock, lock_flag);
re_chan->alloc_count++;
spin_unlock_irqrestore(&re_chan->desc_lock, lock_flag);
}
return desc;
}
static struct dma_async_tx_descriptor *fsl_re_prep_dma_genq(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf, size_t len,
unsigned long flags)
{
struct fsl_re_chan *re_chan;
struct fsl_re_desc *desc;
struct fsl_re_xor_cdb *xor;
struct fsl_re_cmpnd_frame *cf;
u32 cdb;
unsigned int i, j;
unsigned int save_src_cnt = src_cnt;
int cont_q = 0;
re_chan = container_of(chan, struct fsl_re_chan, chan);
if (len > FSL_RE_MAX_DATA_LEN) {
dev_err(re_chan->dev, "genq tx length %zu, max length %d\n",
len, FSL_RE_MAX_DATA_LEN);
return NULL;
}
desc = fsl_re_chan_alloc_desc(re_chan, flags);
if (desc <= 0)
return NULL;
if (scf && (flags & DMA_PREP_CONTINUE)) {
cont_q = 1;
src_cnt += 1;
}
/* Filling xor CDB */
cdb = FSL_RE_XOR_OPCODE << FSL_RE_CDB_OPCODE_SHIFT;
cdb |= (src_cnt - 1) << FSL_RE_CDB_NRCS_SHIFT;
cdb |= FSL_RE_BLOCK_SIZE << FSL_RE_CDB_BLKSIZE_SHIFT;
cdb |= FSL_RE_INTR_ON_ERROR << FSL_RE_CDB_ERROR_SHIFT;
cdb |= FSL_RE_DATA_DEP << FSL_RE_CDB_DEPEND_SHIFT;
xor = desc->cdb_addr;
xor->cdb32 = cdb;
if (scf) {
/* compute q = src0*coef0^src1*coef1^..., * is GF(8) mult */
for (i = 0; i < save_src_cnt; i++)
xor->gfm[i] = scf[i];
if (cont_q)
xor->gfm[i++] = 1;
} else {
/* compute P, that is XOR all srcs */
for (i = 0; i < src_cnt; i++)
xor->gfm[i] = 1;
}
/* Filling frame 0 of compound frame descriptor with CDB */
cf = desc->cf_addr;
fill_cfd_frame(cf, 0, sizeof(*xor), desc->cdb_paddr, 0);
/* Fill CFD's 1st frame with dest buffer */
fill_cfd_frame(cf, 1, len, dest, 0);
/* Fill CFD's rest of the frames with source buffers */
for (i = 2, j = 0; j < save_src_cnt; i++, j++)
fill_cfd_frame(cf, i, len, src[j], 0);
if (cont_q)
fill_cfd_frame(cf, i++, len, dest, 0);
/* Setting the final bit in the last source buffer frame in CFD */
cf[i - 1].efrl32 |= 1 << FSL_RE_CF_FINAL_SHIFT;
return &desc->async_tx;
}
/*
* Prep function for P parity calculation.In RAID Engine terminology,
* XOR calculation is called GenQ calculation done through GenQ command
*/
static struct dma_async_tx_descriptor *fsl_re_prep_dma_xor(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
unsigned int src_cnt, size_t len, unsigned long flags)
{
/* NULL let genq take all coef as 1 */
return fsl_re_prep_dma_genq(chan, dest, src, src_cnt, NULL, len, flags);
}
/*
* Prep function for P/Q parity calculation.In RAID Engine terminology,
* P/Q calculation is called GenQQ done through GenQQ command
*/
static struct dma_async_tx_descriptor *fsl_re_prep_dma_pq(
struct dma_chan *chan, dma_addr_t *dest, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf, size_t len,
unsigned long flags)
{
struct fsl_re_chan *re_chan;
struct fsl_re_desc *desc;
struct fsl_re_pq_cdb *pq;
struct fsl_re_cmpnd_frame *cf;
u32 cdb;
u8 *p;
int gfmq_len, i, j;
unsigned int save_src_cnt = src_cnt;
re_chan = container_of(chan, struct fsl_re_chan, chan);
if (len > FSL_RE_MAX_DATA_LEN) {
dev_err(re_chan->dev, "pq tx length is %zu, max length is %d\n",
len, FSL_RE_MAX_DATA_LEN);
return NULL;
}
/*
* RE requires at least 2 sources, if given only one source, we pass the
* second source same as the first one.
* With only one source, generating P is meaningless, only generate Q.
*/
if (src_cnt == 1) {
struct dma_async_tx_descriptor *tx;
dma_addr_t dma_src[2];
unsigned char coef[2];
dma_src[0] = *src;
coef[0] = *scf;
dma_src[1] = *src;
coef[1] = 0;
tx = fsl_re_prep_dma_genq(chan, dest[1], dma_src, 2, coef, len,
flags);
if (tx)
desc = to_fsl_re_dma_desc(tx);
return tx;
}
/*
* During RAID6 array creation, Linux's MD layer gets P and Q
* calculated separately in two steps. But our RAID Engine has
* the capability to calculate both P and Q with a single command
* Hence to merge well with MD layer, we need to provide a hook
* here and call re_jq_prep_dma_genq() function
*/
if (flags & DMA_PREP_PQ_DISABLE_P)
return fsl_re_prep_dma_genq(chan, dest[1], src, src_cnt,
scf, len, flags);
if (flags & DMA_PREP_CONTINUE)
src_cnt += 3;
desc = fsl_re_chan_alloc_desc(re_chan, flags);
if (desc <= 0)
return NULL;
/* Filling GenQQ CDB */
cdb = FSL_RE_PQ_OPCODE << FSL_RE_CDB_OPCODE_SHIFT;
cdb |= (src_cnt - 1) << FSL_RE_CDB_NRCS_SHIFT;
cdb |= FSL_RE_BLOCK_SIZE << FSL_RE_CDB_BLKSIZE_SHIFT;
cdb |= FSL_RE_BUFFER_OUTPUT << FSL_RE_CDB_BUFFER_SHIFT;
cdb |= FSL_RE_DATA_DEP << FSL_RE_CDB_DEPEND_SHIFT;
pq = desc->cdb_addr;
pq->cdb32 = cdb;
p = pq->gfm_q1;
/* Init gfm_q1[] */
for (i = 0; i < src_cnt; i++)
p[i] = 1;
/* Align gfm[] to 32bit */
gfmq_len = ALIGN(src_cnt, 4);
/* Init gfm_q2[] */
p += gfmq_len;
for (i = 0; i < src_cnt; i++)
p[i] = scf[i];
/* Filling frame 0 of compound frame descriptor with CDB */
cf = desc->cf_addr;
fill_cfd_frame(cf, 0, sizeof(struct fsl_re_pq_cdb), desc->cdb_paddr, 0);
/* Fill CFD's 1st & 2nd frame with dest buffers */
for (i = 1, j = 0; i < 3; i++, j++)
fill_cfd_frame(cf, i, len, dest[j], 0);
/* Fill CFD's rest of the frames with source buffers */
for (i = 3, j = 0; j < save_src_cnt; i++, j++)
fill_cfd_frame(cf, i, len, src[j], 0);
/* PQ computation continuation */
if (flags & DMA_PREP_CONTINUE) {
if (src_cnt - save_src_cnt == 3) {
p[save_src_cnt] = 0;
p[save_src_cnt + 1] = 0;
p[save_src_cnt + 2] = 1;
fill_cfd_frame(cf, i++, len, dest[0], 0);
fill_cfd_frame(cf, i++, len, dest[1], 0);
fill_cfd_frame(cf, i++, len, dest[1], 0);
} else {
dev_err(re_chan->dev, "PQ tx continuation error!\n");
return NULL;
}
}
/* Setting the final bit in the last source buffer frame in CFD */
cf[i - 1].efrl32 |= 1 << FSL_RE_CF_FINAL_SHIFT;
return &desc->async_tx;
}
/*
* Prep function for memcpy. In RAID Engine, memcpy is done through MOVE
* command. Logic of this function will need to be modified once multipage
* support is added in Linux's MD/ASYNC Layer
*/
static struct dma_async_tx_descriptor *fsl_re_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct fsl_re_chan *re_chan;
struct fsl_re_desc *desc;
size_t length;
struct fsl_re_cmpnd_frame *cf;
struct fsl_re_move_cdb *move;
u32 cdb;
re_chan = container_of(chan, struct fsl_re_chan, chan);
if (len > FSL_RE_MAX_DATA_LEN) {
dev_err(re_chan->dev, "cp tx length is %zu, max length is %d\n",
len, FSL_RE_MAX_DATA_LEN);
return NULL;
}
desc = fsl_re_chan_alloc_desc(re_chan, flags);
if (desc <= 0)
return NULL;
/* Filling move CDB */
cdb = FSL_RE_MOVE_OPCODE << FSL_RE_CDB_OPCODE_SHIFT;
cdb |= FSL_RE_BLOCK_SIZE << FSL_RE_CDB_BLKSIZE_SHIFT;
cdb |= FSL_RE_INTR_ON_ERROR << FSL_RE_CDB_ERROR_SHIFT;
cdb |= FSL_RE_DATA_DEP << FSL_RE_CDB_DEPEND_SHIFT;
move = desc->cdb_addr;
move->cdb32 = cdb;
/* Filling frame 0 of CFD with move CDB */
cf = desc->cf_addr;
fill_cfd_frame(cf, 0, sizeof(*move), desc->cdb_paddr, 0);
length = min_t(size_t, len, FSL_RE_MAX_DATA_LEN);
/* Fill CFD's 1st frame with dest buffer */
fill_cfd_frame(cf, 1, length, dest, 0);
/* Fill CFD's 2nd frame with src buffer */
fill_cfd_frame(cf, 2, length, src, 1);
return &desc->async_tx;
}
static int fsl_re_alloc_chan_resources(struct dma_chan *chan)
{
struct fsl_re_chan *re_chan;
struct fsl_re_desc *desc;
void *cf;
dma_addr_t paddr;
int i;
re_chan = container_of(chan, struct fsl_re_chan, chan);
for (i = 0; i < FSL_RE_MIN_DESCS; i++) {
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
break;
cf = dma_pool_alloc(re_chan->re_dev->cf_desc_pool, GFP_KERNEL,
&paddr);
if (!cf) {
kfree(desc);
break;
}
INIT_LIST_HEAD(&desc->node);
fsl_re_init_desc(re_chan, desc, cf, paddr);
list_add_tail(&desc->node, &re_chan->free_q);
re_chan->alloc_count++;
}
return re_chan->alloc_count;
}
static void fsl_re_free_chan_resources(struct dma_chan *chan)
{
struct fsl_re_chan *re_chan;
struct fsl_re_desc *desc;
re_chan = container_of(chan, struct fsl_re_chan, chan);
while (re_chan->alloc_count--) {
desc = list_first_entry(&re_chan->free_q,
struct fsl_re_desc,
node);
list_del(&desc->node);
dma_pool_free(re_chan->re_dev->cf_desc_pool, desc->cf_addr,
desc->cf_paddr);
kfree(desc);
}
if (!list_empty(&re_chan->free_q))
dev_err(re_chan->dev, "chan resource cannot be cleaned!\n");
}
static int fsl_re_chan_probe(struct platform_device *ofdev,
struct device_node *np, u8 q, u32 off)
{
struct device *dev, *chandev;
struct fsl_re_drv_private *re_priv;
struct fsl_re_chan *chan;
struct dma_device *dma_dev;
u32 ptr;
u32 status;
int ret = 0, rc;
struct platform_device *chan_ofdev;
dev = &ofdev->dev;
re_priv = dev_get_drvdata(dev);
dma_dev = &re_priv->dma_dev;
chan = devm_kzalloc(dev, sizeof(*chan), GFP_KERNEL);
if (!chan)
return -ENOMEM;
/* create platform device for chan node */
chan_ofdev = of_platform_device_create(np, NULL, dev);
if (!chan_ofdev) {
dev_err(dev, "Not able to create ofdev for jr %d\n", q);
ret = -EINVAL;
goto err_free;
}
/* read reg property from dts */
rc = of_property_read_u32(np, "reg", &ptr);
if (rc) {
dev_err(dev, "Reg property not found in jr %d\n", q);
ret = -ENODEV;
goto err_free;
}
chan->jrregs = (struct fsl_re_chan_cfg *)((u8 *)re_priv->re_regs +
off + ptr);
/* read irq property from dts */
chan->irq = irq_of_parse_and_map(np, 0);
if (!chan->irq) {
dev_err(dev, "No IRQ defined for JR %d\n", q);
ret = -ENODEV;
goto err_free;
}
snprintf(chan->name, sizeof(chan->name), "re_jr%02d", q);
chandev = &chan_ofdev->dev;
tasklet_setup(&chan->irqtask, fsl_re_dequeue);
ret = request_irq(chan->irq, fsl_re_isr, 0, chan->name, chandev);
if (ret) {
dev_err(dev, "Unable to register interrupt for JR %d\n", q);
ret = -EINVAL;
goto err_free;
}
re_priv->re_jrs[q] = chan;
chan->chan.device = dma_dev;
chan->chan.private = chan;
chan->dev = chandev;
chan->re_dev = re_priv;
spin_lock_init(&chan->desc_lock);
INIT_LIST_HEAD(&chan->ack_q);
INIT_LIST_HEAD(&chan->active_q);
INIT_LIST_HEAD(&chan->submit_q);
INIT_LIST_HEAD(&chan->free_q);
chan->inb_ring_virt_addr = dma_pool_alloc(chan->re_dev->hw_desc_pool,
GFP_KERNEL, &chan->inb_phys_addr);
if (!chan->inb_ring_virt_addr) {
dev_err(dev, "No dma memory for inb_ring_virt_addr\n");
ret = -ENOMEM;
goto err_free;
}
chan->oub_ring_virt_addr = dma_pool_alloc(chan->re_dev->hw_desc_pool,
GFP_KERNEL, &chan->oub_phys_addr);
if (!chan->oub_ring_virt_addr) {
dev_err(dev, "No dma memory for oub_ring_virt_addr\n");
ret = -ENOMEM;
goto err_free_1;
}
/* Program the Inbound/Outbound ring base addresses and size */
out_be32(&chan->jrregs->inbring_base_h,
chan->inb_phys_addr & FSL_RE_ADDR_BIT_MASK);
out_be32(&chan->jrregs->oubring_base_h,
chan->oub_phys_addr & FSL_RE_ADDR_BIT_MASK);
out_be32(&chan->jrregs->inbring_base_l,
chan->inb_phys_addr >> FSL_RE_ADDR_BIT_SHIFT);
out_be32(&chan->jrregs->oubring_base_l,
chan->oub_phys_addr >> FSL_RE_ADDR_BIT_SHIFT);
out_be32(&chan->jrregs->inbring_size,
FSL_RE_RING_SIZE << FSL_RE_RING_SIZE_SHIFT);
out_be32(&chan->jrregs->oubring_size,
FSL_RE_RING_SIZE << FSL_RE_RING_SIZE_SHIFT);
/* Read LIODN value from u-boot */
status = in_be32(&chan->jrregs->jr_config_1) & FSL_RE_REG_LIODN_MASK;
/* Program the CFG reg */
out_be32(&chan->jrregs->jr_config_1,
FSL_RE_CFG1_CBSI | FSL_RE_CFG1_CBS0 | status);
dev_set_drvdata(chandev, chan);
/* Enable RE/CHAN */
out_be32(&chan->jrregs->jr_command, FSL_RE_ENABLE);
return 0;
err_free_1:
dma_pool_free(chan->re_dev->hw_desc_pool, chan->inb_ring_virt_addr,
chan->inb_phys_addr);
err_free:
return ret;
}
/* Probe function for RAID Engine */
static int fsl_re_probe(struct platform_device *ofdev)
{
struct fsl_re_drv_private *re_priv;
struct device_node *np;
struct device_node *child;
u32 off;
u8 ridx = 0;
struct dma_device *dma_dev;
struct resource *res;
int rc;
struct device *dev = &ofdev->dev;
re_priv = devm_kzalloc(dev, sizeof(*re_priv), GFP_KERNEL);
if (!re_priv)
return -ENOMEM;
res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
/* IOMAP the entire RAID Engine region */
re_priv->re_regs = devm_ioremap(dev, res->start, resource_size(res));
if (!re_priv->re_regs)
return -EBUSY;
/* Program the RE mode */
out_be32(&re_priv->re_regs->global_config, FSL_RE_NON_DPAA_MODE);
/* Program Galois Field polynomial */
out_be32(&re_priv->re_regs->galois_field_config, FSL_RE_GFM_POLY);
dev_info(dev, "version %x, mode %x, gfp %x\n",
in_be32(&re_priv->re_regs->re_version_id),
in_be32(&re_priv->re_regs->global_config),
in_be32(&re_priv->re_regs->galois_field_config));
dma_dev = &re_priv->dma_dev;
dma_dev->dev = dev;
INIT_LIST_HEAD(&dma_dev->channels);
dma_set_mask(dev, DMA_BIT_MASK(40));
dma_dev->device_alloc_chan_resources = fsl_re_alloc_chan_resources;
dma_dev->device_tx_status = fsl_re_tx_status;
dma_dev->device_issue_pending = fsl_re_issue_pending;
dma_dev->max_xor = FSL_RE_MAX_XOR_SRCS;
dma_dev->device_prep_dma_xor = fsl_re_prep_dma_xor;
dma_cap_set(DMA_XOR, dma_dev->cap_mask);
dma_dev->max_pq = FSL_RE_MAX_PQ_SRCS;
dma_dev->device_prep_dma_pq = fsl_re_prep_dma_pq;
dma_cap_set(DMA_PQ, dma_dev->cap_mask);
dma_dev->device_prep_dma_memcpy = fsl_re_prep_dma_memcpy;
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
dma_dev->device_free_chan_resources = fsl_re_free_chan_resources;
re_priv->total_chans = 0;
re_priv->cf_desc_pool = dmam_pool_create("fsl_re_cf_desc_pool", dev,
FSL_RE_CF_CDB_SIZE,
FSL_RE_CF_CDB_ALIGN, 0);
if (!re_priv->cf_desc_pool) {
dev_err(dev, "No memory for fsl re_cf desc pool\n");
return -ENOMEM;
}
re_priv->hw_desc_pool = dmam_pool_create("fsl_re_hw_desc_pool", dev,
sizeof(struct fsl_re_hw_desc) * FSL_RE_RING_SIZE,
FSL_RE_FRAME_ALIGN, 0);
if (!re_priv->hw_desc_pool) {
dev_err(dev, "No memory for fsl re_hw desc pool\n");
return -ENOMEM;
}
dev_set_drvdata(dev, re_priv);
/* Parse Device tree to find out the total number of JQs present */
for_each_compatible_node(np, NULL, "fsl,raideng-v1.0-job-queue") {
rc = of_property_read_u32(np, "reg", &off);
if (rc) {
dev_err(dev, "Reg property not found in JQ node\n");
of_node_put(np);
return -ENODEV;
}
/* Find out the Job Rings present under each JQ */
for_each_child_of_node(np, child) {
rc = of_device_is_compatible(child,
"fsl,raideng-v1.0-job-ring");
if (rc) {
fsl_re_chan_probe(ofdev, child, ridx++, off);
re_priv->total_chans++;
}
}
}
dma_async_device_register(dma_dev);
return 0;
}
static void fsl_re_remove_chan(struct fsl_re_chan *chan)
{
tasklet_kill(&chan->irqtask);
dma_pool_free(chan->re_dev->hw_desc_pool, chan->inb_ring_virt_addr,
chan->inb_phys_addr);
dma_pool_free(chan->re_dev->hw_desc_pool, chan->oub_ring_virt_addr,
chan->oub_phys_addr);
}
static int fsl_re_remove(struct platform_device *ofdev)
{
struct fsl_re_drv_private *re_priv;
struct device *dev;
int i;
dev = &ofdev->dev;
re_priv = dev_get_drvdata(dev);
/* Cleanup chan related memory areas */
for (i = 0; i < re_priv->total_chans; i++)
fsl_re_remove_chan(re_priv->re_jrs[i]);
/* Unregister the driver */
dma_async_device_unregister(&re_priv->dma_dev);
return 0;
}
static const struct of_device_id fsl_re_ids[] = {
{ .compatible = "fsl,raideng-v1.0", },
{}
};
MODULE_DEVICE_TABLE(of, fsl_re_ids);
static struct platform_driver fsl_re_driver = {
.driver = {
.name = "fsl-raideng",
.of_match_table = fsl_re_ids,
},
.probe = fsl_re_probe,
.remove = fsl_re_remove,
};
module_platform_driver(fsl_re_driver);
MODULE_AUTHOR("Harninder Rai <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Freescale RAID Engine Device Driver");
| linux-master | drivers/dma/fsl_raid.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for Audio DMA Controller (ADMAC) on t8103 (M1) and other Apple chips
*
* Copyright (C) The Asahi Linux Contributors
*/
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include "dmaengine.h"
#define NCHANNELS_MAX 64
#define IRQ_NOUTPUTS 4
/*
* For allocation purposes we split the cache
* memory into blocks of fixed size (given in bytes).
*/
#define SRAM_BLOCK 2048
#define RING_WRITE_SLOT GENMASK(1, 0)
#define RING_READ_SLOT GENMASK(5, 4)
#define RING_FULL BIT(9)
#define RING_EMPTY BIT(8)
#define RING_ERR BIT(10)
#define STATUS_DESC_DONE BIT(0)
#define STATUS_ERR BIT(6)
#define FLAG_DESC_NOTIFY BIT(16)
#define REG_TX_START 0x0000
#define REG_TX_STOP 0x0004
#define REG_RX_START 0x0008
#define REG_RX_STOP 0x000c
#define REG_IMPRINT 0x0090
#define REG_TX_SRAM_SIZE 0x0094
#define REG_RX_SRAM_SIZE 0x0098
#define REG_CHAN_CTL(ch) (0x8000 + (ch) * 0x200)
#define REG_CHAN_CTL_RST_RINGS BIT(0)
#define REG_DESC_RING(ch) (0x8070 + (ch) * 0x200)
#define REG_REPORT_RING(ch) (0x8074 + (ch) * 0x200)
#define REG_RESIDUE(ch) (0x8064 + (ch) * 0x200)
#define REG_BUS_WIDTH(ch) (0x8040 + (ch) * 0x200)
#define BUS_WIDTH_8BIT 0x00
#define BUS_WIDTH_16BIT 0x01
#define BUS_WIDTH_32BIT 0x02
#define BUS_WIDTH_FRAME_2_WORDS 0x10
#define BUS_WIDTH_FRAME_4_WORDS 0x20
#define REG_CHAN_SRAM_CARVEOUT(ch) (0x8050 + (ch) * 0x200)
#define CHAN_SRAM_CARVEOUT_SIZE GENMASK(31, 16)
#define CHAN_SRAM_CARVEOUT_BASE GENMASK(15, 0)
#define REG_CHAN_FIFOCTL(ch) (0x8054 + (ch) * 0x200)
#define CHAN_FIFOCTL_LIMIT GENMASK(31, 16)
#define CHAN_FIFOCTL_THRESHOLD GENMASK(15, 0)
#define REG_DESC_WRITE(ch) (0x10000 + ((ch) / 2) * 0x4 + ((ch) & 1) * 0x4000)
#define REG_REPORT_READ(ch) (0x10100 + ((ch) / 2) * 0x4 + ((ch) & 1) * 0x4000)
#define REG_TX_INTSTATE(idx) (0x0030 + (idx) * 4)
#define REG_RX_INTSTATE(idx) (0x0040 + (idx) * 4)
#define REG_GLOBAL_INTSTATE(idx) (0x0050 + (idx) * 4)
#define REG_CHAN_INTSTATUS(ch, idx) (0x8010 + (ch) * 0x200 + (idx) * 4)
#define REG_CHAN_INTMASK(ch, idx) (0x8020 + (ch) * 0x200 + (idx) * 4)
struct admac_data;
struct admac_tx;
struct admac_chan {
unsigned int no;
struct admac_data *host;
struct dma_chan chan;
struct tasklet_struct tasklet;
u32 carveout;
spinlock_t lock;
struct admac_tx *current_tx;
int nperiod_acks;
/*
* We maintain a 'submitted' and 'issued' list mainly for interface
* correctness. Typical use of the driver (per channel) will be
* prepping, submitting and issuing a single cyclic transaction which
* will stay current until terminate_all is called.
*/
struct list_head submitted;
struct list_head issued;
struct list_head to_free;
};
struct admac_sram {
u32 size;
/*
* SRAM_CARVEOUT has 16-bit fields, so the SRAM cannot be larger than
* 64K and a 32-bit bitfield over 2K blocks covers it.
*/
u32 allocated;
};
struct admac_data {
struct dma_device dma;
struct device *dev;
__iomem void *base;
struct reset_control *rstc;
struct mutex cache_alloc_lock;
struct admac_sram txcache, rxcache;
int irq;
int irq_index;
int nchannels;
struct admac_chan channels[];
};
struct admac_tx {
struct dma_async_tx_descriptor tx;
bool cyclic;
dma_addr_t buf_addr;
dma_addr_t buf_end;
size_t buf_len;
size_t period_len;
size_t submitted_pos;
size_t reclaimed_pos;
struct list_head node;
};
static int admac_alloc_sram_carveout(struct admac_data *ad,
enum dma_transfer_direction dir,
u32 *out)
{
struct admac_sram *sram;
int i, ret = 0, nblocks;
if (dir == DMA_MEM_TO_DEV)
sram = &ad->txcache;
else
sram = &ad->rxcache;
mutex_lock(&ad->cache_alloc_lock);
nblocks = sram->size / SRAM_BLOCK;
for (i = 0; i < nblocks; i++)
if (!(sram->allocated & BIT(i)))
break;
if (i < nblocks) {
*out = FIELD_PREP(CHAN_SRAM_CARVEOUT_BASE, i * SRAM_BLOCK) |
FIELD_PREP(CHAN_SRAM_CARVEOUT_SIZE, SRAM_BLOCK);
sram->allocated |= BIT(i);
} else {
ret = -EBUSY;
}
mutex_unlock(&ad->cache_alloc_lock);
return ret;
}
static void admac_free_sram_carveout(struct admac_data *ad,
enum dma_transfer_direction dir,
u32 carveout)
{
struct admac_sram *sram;
u32 base = FIELD_GET(CHAN_SRAM_CARVEOUT_BASE, carveout);
int i;
if (dir == DMA_MEM_TO_DEV)
sram = &ad->txcache;
else
sram = &ad->rxcache;
if (WARN_ON(base >= sram->size))
return;
mutex_lock(&ad->cache_alloc_lock);
i = base / SRAM_BLOCK;
sram->allocated &= ~BIT(i);
mutex_unlock(&ad->cache_alloc_lock);
}
static void admac_modify(struct admac_data *ad, int reg, u32 mask, u32 val)
{
void __iomem *addr = ad->base + reg;
u32 curr = readl_relaxed(addr);
writel_relaxed((curr & ~mask) | (val & mask), addr);
}
static struct admac_chan *to_admac_chan(struct dma_chan *chan)
{
return container_of(chan, struct admac_chan, chan);
}
static struct admac_tx *to_admac_tx(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct admac_tx, tx);
}
static enum dma_transfer_direction admac_chan_direction(int channo)
{
/* Channel directions are hardwired */
return (channo & 1) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
}
static dma_cookie_t admac_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct admac_tx *adtx = to_admac_tx(tx);
struct admac_chan *adchan = to_admac_chan(tx->chan);
unsigned long flags;
dma_cookie_t cookie;
spin_lock_irqsave(&adchan->lock, flags);
cookie = dma_cookie_assign(tx);
list_add_tail(&adtx->node, &adchan->submitted);
spin_unlock_irqrestore(&adchan->lock, flags);
return cookie;
}
static int admac_desc_free(struct dma_async_tx_descriptor *tx)
{
kfree(to_admac_tx(tx));
return 0;
}
static struct dma_async_tx_descriptor *admac_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct admac_chan *adchan = container_of(chan, struct admac_chan, chan);
struct admac_tx *adtx;
if (direction != admac_chan_direction(adchan->no))
return NULL;
adtx = kzalloc(sizeof(*adtx), GFP_NOWAIT);
if (!adtx)
return NULL;
adtx->cyclic = true;
adtx->buf_addr = buf_addr;
adtx->buf_len = buf_len;
adtx->buf_end = buf_addr + buf_len;
adtx->period_len = period_len;
adtx->submitted_pos = 0;
adtx->reclaimed_pos = 0;
dma_async_tx_descriptor_init(&adtx->tx, chan);
adtx->tx.tx_submit = admac_tx_submit;
adtx->tx.desc_free = admac_desc_free;
return &adtx->tx;
}
/*
* Write one hardware descriptor for a dmaengine cyclic transaction.
*/
static void admac_cyclic_write_one_desc(struct admac_data *ad, int channo,
struct admac_tx *tx)
{
dma_addr_t addr;
addr = tx->buf_addr + (tx->submitted_pos % tx->buf_len);
/* If happens means we have buggy code */
WARN_ON_ONCE(addr + tx->period_len > tx->buf_end);
dev_dbg(ad->dev, "ch%d descriptor: addr=0x%pad len=0x%zx flags=0x%lx\n",
channo, &addr, tx->period_len, FLAG_DESC_NOTIFY);
writel_relaxed(lower_32_bits(addr), ad->base + REG_DESC_WRITE(channo));
writel_relaxed(upper_32_bits(addr), ad->base + REG_DESC_WRITE(channo));
writel_relaxed(tx->period_len, ad->base + REG_DESC_WRITE(channo));
writel_relaxed(FLAG_DESC_NOTIFY, ad->base + REG_DESC_WRITE(channo));
tx->submitted_pos += tx->period_len;
tx->submitted_pos %= 2 * tx->buf_len;
}
/*
* Write all the hardware descriptors for a dmaengine cyclic
* transaction there is space for.
*/
static void admac_cyclic_write_desc(struct admac_data *ad, int channo,
struct admac_tx *tx)
{
int i;
for (i = 0; i < 4; i++) {
if (readl_relaxed(ad->base + REG_DESC_RING(channo)) & RING_FULL)
break;
admac_cyclic_write_one_desc(ad, channo, tx);
}
}
static int admac_ring_noccupied_slots(int ringval)
{
int wrslot = FIELD_GET(RING_WRITE_SLOT, ringval);
int rdslot = FIELD_GET(RING_READ_SLOT, ringval);
if (wrslot != rdslot) {
return (wrslot + 4 - rdslot) % 4;
} else {
WARN_ON((ringval & (RING_FULL | RING_EMPTY)) == 0);
if (ringval & RING_FULL)
return 4;
else
return 0;
}
}
/*
* Read from hardware the residue of a cyclic dmaengine transaction.
*/
static u32 admac_cyclic_read_residue(struct admac_data *ad, int channo,
struct admac_tx *adtx)
{
u32 ring1, ring2;
u32 residue1, residue2;
int nreports;
size_t pos;
ring1 = readl_relaxed(ad->base + REG_REPORT_RING(channo));
residue1 = readl_relaxed(ad->base + REG_RESIDUE(channo));
ring2 = readl_relaxed(ad->base + REG_REPORT_RING(channo));
residue2 = readl_relaxed(ad->base + REG_RESIDUE(channo));
if (residue2 > residue1) {
/*
* Controller must have loaded next descriptor between
* the two residue reads
*/
nreports = admac_ring_noccupied_slots(ring1) + 1;
} else {
/* No descriptor load between the two reads, ring2 is safe to use */
nreports = admac_ring_noccupied_slots(ring2);
}
pos = adtx->reclaimed_pos + adtx->period_len * (nreports + 1) - residue2;
return adtx->buf_len - pos % adtx->buf_len;
}
static enum dma_status admac_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct admac_chan *adchan = to_admac_chan(chan);
struct admac_data *ad = adchan->host;
struct admac_tx *adtx;
enum dma_status ret;
size_t residue;
unsigned long flags;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&adchan->lock, flags);
adtx = adchan->current_tx;
if (adtx && adtx->tx.cookie == cookie) {
ret = DMA_IN_PROGRESS;
residue = admac_cyclic_read_residue(ad, adchan->no, adtx);
} else {
ret = DMA_IN_PROGRESS;
residue = 0;
list_for_each_entry(adtx, &adchan->issued, node) {
if (adtx->tx.cookie == cookie) {
residue = adtx->buf_len;
break;
}
}
}
spin_unlock_irqrestore(&adchan->lock, flags);
dma_set_residue(txstate, residue);
return ret;
}
static void admac_start_chan(struct admac_chan *adchan)
{
struct admac_data *ad = adchan->host;
u32 startbit = 1 << (adchan->no / 2);
writel_relaxed(STATUS_DESC_DONE | STATUS_ERR,
ad->base + REG_CHAN_INTSTATUS(adchan->no, ad->irq_index));
writel_relaxed(STATUS_DESC_DONE | STATUS_ERR,
ad->base + REG_CHAN_INTMASK(adchan->no, ad->irq_index));
switch (admac_chan_direction(adchan->no)) {
case DMA_MEM_TO_DEV:
writel_relaxed(startbit, ad->base + REG_TX_START);
break;
case DMA_DEV_TO_MEM:
writel_relaxed(startbit, ad->base + REG_RX_START);
break;
default:
break;
}
dev_dbg(adchan->host->dev, "ch%d start\n", adchan->no);
}
static void admac_stop_chan(struct admac_chan *adchan)
{
struct admac_data *ad = adchan->host;
u32 stopbit = 1 << (adchan->no / 2);
switch (admac_chan_direction(adchan->no)) {
case DMA_MEM_TO_DEV:
writel_relaxed(stopbit, ad->base + REG_TX_STOP);
break;
case DMA_DEV_TO_MEM:
writel_relaxed(stopbit, ad->base + REG_RX_STOP);
break;
default:
break;
}
dev_dbg(adchan->host->dev, "ch%d stop\n", adchan->no);
}
static void admac_reset_rings(struct admac_chan *adchan)
{
struct admac_data *ad = adchan->host;
writel_relaxed(REG_CHAN_CTL_RST_RINGS,
ad->base + REG_CHAN_CTL(adchan->no));
writel_relaxed(0, ad->base + REG_CHAN_CTL(adchan->no));
}
static void admac_start_current_tx(struct admac_chan *adchan)
{
struct admac_data *ad = adchan->host;
int ch = adchan->no;
admac_reset_rings(adchan);
writel_relaxed(0, ad->base + REG_CHAN_CTL(ch));
admac_cyclic_write_one_desc(ad, ch, adchan->current_tx);
admac_start_chan(adchan);
admac_cyclic_write_desc(ad, ch, adchan->current_tx);
}
static void admac_issue_pending(struct dma_chan *chan)
{
struct admac_chan *adchan = to_admac_chan(chan);
struct admac_tx *tx;
unsigned long flags;
spin_lock_irqsave(&adchan->lock, flags);
list_splice_tail_init(&adchan->submitted, &adchan->issued);
if (!list_empty(&adchan->issued) && !adchan->current_tx) {
tx = list_first_entry(&adchan->issued, struct admac_tx, node);
list_del(&tx->node);
adchan->current_tx = tx;
adchan->nperiod_acks = 0;
admac_start_current_tx(adchan);
}
spin_unlock_irqrestore(&adchan->lock, flags);
}
static int admac_pause(struct dma_chan *chan)
{
struct admac_chan *adchan = to_admac_chan(chan);
admac_stop_chan(adchan);
return 0;
}
static int admac_resume(struct dma_chan *chan)
{
struct admac_chan *adchan = to_admac_chan(chan);
admac_start_chan(adchan);
return 0;
}
static int admac_terminate_all(struct dma_chan *chan)
{
struct admac_chan *adchan = to_admac_chan(chan);
unsigned long flags;
spin_lock_irqsave(&adchan->lock, flags);
admac_stop_chan(adchan);
admac_reset_rings(adchan);
if (adchan->current_tx) {
list_add_tail(&adchan->current_tx->node, &adchan->to_free);
adchan->current_tx = NULL;
}
/*
* Descriptors can only be freed after the tasklet
* has been killed (in admac_synchronize).
*/
list_splice_tail_init(&adchan->submitted, &adchan->to_free);
list_splice_tail_init(&adchan->issued, &adchan->to_free);
spin_unlock_irqrestore(&adchan->lock, flags);
return 0;
}
static void admac_synchronize(struct dma_chan *chan)
{
struct admac_chan *adchan = to_admac_chan(chan);
struct admac_tx *adtx, *_adtx;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&adchan->lock, flags);
list_splice_tail_init(&adchan->to_free, &head);
spin_unlock_irqrestore(&adchan->lock, flags);
tasklet_kill(&adchan->tasklet);
list_for_each_entry_safe(adtx, _adtx, &head, node) {
list_del(&adtx->node);
admac_desc_free(&adtx->tx);
}
}
static int admac_alloc_chan_resources(struct dma_chan *chan)
{
struct admac_chan *adchan = to_admac_chan(chan);
struct admac_data *ad = adchan->host;
int ret;
dma_cookie_init(&adchan->chan);
ret = admac_alloc_sram_carveout(ad, admac_chan_direction(adchan->no),
&adchan->carveout);
if (ret < 0)
return ret;
writel_relaxed(adchan->carveout,
ad->base + REG_CHAN_SRAM_CARVEOUT(adchan->no));
return 0;
}
static void admac_free_chan_resources(struct dma_chan *chan)
{
struct admac_chan *adchan = to_admac_chan(chan);
admac_terminate_all(chan);
admac_synchronize(chan);
admac_free_sram_carveout(adchan->host, admac_chan_direction(adchan->no),
adchan->carveout);
}
static struct dma_chan *admac_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct admac_data *ad = (struct admac_data *) ofdma->of_dma_data;
unsigned int index;
if (dma_spec->args_count != 1)
return NULL;
index = dma_spec->args[0];
if (index >= ad->nchannels) {
dev_err(ad->dev, "channel index %u out of bounds\n", index);
return NULL;
}
return dma_get_slave_channel(&ad->channels[index].chan);
}
static int admac_drain_reports(struct admac_data *ad, int channo)
{
int count;
for (count = 0; count < 4; count++) {
u32 countval_hi, countval_lo, unk1, flags;
if (readl_relaxed(ad->base + REG_REPORT_RING(channo)) & RING_EMPTY)
break;
countval_lo = readl_relaxed(ad->base + REG_REPORT_READ(channo));
countval_hi = readl_relaxed(ad->base + REG_REPORT_READ(channo));
unk1 = readl_relaxed(ad->base + REG_REPORT_READ(channo));
flags = readl_relaxed(ad->base + REG_REPORT_READ(channo));
dev_dbg(ad->dev, "ch%d report: countval=0x%llx unk1=0x%x flags=0x%x\n",
channo, ((u64) countval_hi) << 32 | countval_lo, unk1, flags);
}
return count;
}
static void admac_handle_status_err(struct admac_data *ad, int channo)
{
bool handled = false;
if (readl_relaxed(ad->base + REG_DESC_RING(channo)) & RING_ERR) {
writel_relaxed(RING_ERR, ad->base + REG_DESC_RING(channo));
dev_err_ratelimited(ad->dev, "ch%d descriptor ring error\n", channo);
handled = true;
}
if (readl_relaxed(ad->base + REG_REPORT_RING(channo)) & RING_ERR) {
writel_relaxed(RING_ERR, ad->base + REG_REPORT_RING(channo));
dev_err_ratelimited(ad->dev, "ch%d report ring error\n", channo);
handled = true;
}
if (unlikely(!handled)) {
dev_err(ad->dev, "ch%d unknown error, masking errors as cause of IRQs\n", channo);
admac_modify(ad, REG_CHAN_INTMASK(channo, ad->irq_index),
STATUS_ERR, 0);
}
}
static void admac_handle_status_desc_done(struct admac_data *ad, int channo)
{
struct admac_chan *adchan = &ad->channels[channo];
unsigned long flags;
int nreports;
writel_relaxed(STATUS_DESC_DONE,
ad->base + REG_CHAN_INTSTATUS(channo, ad->irq_index));
spin_lock_irqsave(&adchan->lock, flags);
nreports = admac_drain_reports(ad, channo);
if (adchan->current_tx) {
struct admac_tx *tx = adchan->current_tx;
adchan->nperiod_acks += nreports;
tx->reclaimed_pos += nreports * tx->period_len;
tx->reclaimed_pos %= 2 * tx->buf_len;
admac_cyclic_write_desc(ad, channo, tx);
tasklet_schedule(&adchan->tasklet);
}
spin_unlock_irqrestore(&adchan->lock, flags);
}
static void admac_handle_chan_int(struct admac_data *ad, int no)
{
u32 cause = readl_relaxed(ad->base + REG_CHAN_INTSTATUS(no, ad->irq_index));
if (cause & STATUS_ERR)
admac_handle_status_err(ad, no);
if (cause & STATUS_DESC_DONE)
admac_handle_status_desc_done(ad, no);
}
static irqreturn_t admac_interrupt(int irq, void *devid)
{
struct admac_data *ad = devid;
u32 rx_intstate, tx_intstate, global_intstate;
int i;
rx_intstate = readl_relaxed(ad->base + REG_RX_INTSTATE(ad->irq_index));
tx_intstate = readl_relaxed(ad->base + REG_TX_INTSTATE(ad->irq_index));
global_intstate = readl_relaxed(ad->base + REG_GLOBAL_INTSTATE(ad->irq_index));
if (!tx_intstate && !rx_intstate && !global_intstate)
return IRQ_NONE;
for (i = 0; i < ad->nchannels; i += 2) {
if (tx_intstate & 1)
admac_handle_chan_int(ad, i);
tx_intstate >>= 1;
}
for (i = 1; i < ad->nchannels; i += 2) {
if (rx_intstate & 1)
admac_handle_chan_int(ad, i);
rx_intstate >>= 1;
}
if (global_intstate) {
dev_warn(ad->dev, "clearing unknown global interrupt flag: %x\n",
global_intstate);
writel_relaxed(~(u32) 0, ad->base + REG_GLOBAL_INTSTATE(ad->irq_index));
}
return IRQ_HANDLED;
}
static void admac_chan_tasklet(struct tasklet_struct *t)
{
struct admac_chan *adchan = from_tasklet(adchan, t, tasklet);
struct admac_tx *adtx;
struct dmaengine_desc_callback cb;
struct dmaengine_result tx_result;
int nacks;
spin_lock_irq(&adchan->lock);
adtx = adchan->current_tx;
nacks = adchan->nperiod_acks;
adchan->nperiod_acks = 0;
spin_unlock_irq(&adchan->lock);
if (!adtx || !nacks)
return;
tx_result.result = DMA_TRANS_NOERROR;
tx_result.residue = 0;
dmaengine_desc_get_callback(&adtx->tx, &cb);
while (nacks--)
dmaengine_desc_callback_invoke(&cb, &tx_result);
}
static int admac_device_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct admac_chan *adchan = to_admac_chan(chan);
struct admac_data *ad = adchan->host;
bool is_tx = admac_chan_direction(adchan->no) == DMA_MEM_TO_DEV;
int wordsize = 0;
u32 bus_width = 0;
switch (is_tx ? config->dst_addr_width : config->src_addr_width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
wordsize = 1;
bus_width |= BUS_WIDTH_8BIT;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
wordsize = 2;
bus_width |= BUS_WIDTH_16BIT;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
wordsize = 4;
bus_width |= BUS_WIDTH_32BIT;
break;
default:
return -EINVAL;
}
/*
* We take port_window_size to be the number of words in a frame.
*
* The controller has some means of out-of-band signalling, to the peripheral,
* of words position in a frame. That's where the importance of this control
* comes from.
*/
switch (is_tx ? config->dst_port_window_size : config->src_port_window_size) {
case 0 ... 1:
break;
case 2:
bus_width |= BUS_WIDTH_FRAME_2_WORDS;
break;
case 4:
bus_width |= BUS_WIDTH_FRAME_4_WORDS;
break;
default:
return -EINVAL;
}
writel_relaxed(bus_width, ad->base + REG_BUS_WIDTH(adchan->no));
/*
* By FIFOCTL_LIMIT we seem to set the maximal number of bytes allowed to be
* held in controller's per-channel FIFO. Transfers seem to be triggered
* around the time FIFO occupancy touches FIFOCTL_THRESHOLD.
*
* The numbers we set are more or less arbitrary.
*/
writel_relaxed(FIELD_PREP(CHAN_FIFOCTL_LIMIT, 0x30 * wordsize)
| FIELD_PREP(CHAN_FIFOCTL_THRESHOLD, 0x18 * wordsize),
ad->base + REG_CHAN_FIFOCTL(adchan->no));
return 0;
}
static int admac_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct admac_data *ad;
struct dma_device *dma;
int nchannels;
int err, irq, i;
err = of_property_read_u32(np, "dma-channels", &nchannels);
if (err || nchannels > NCHANNELS_MAX) {
dev_err(&pdev->dev, "missing or invalid dma-channels property\n");
return -EINVAL;
}
ad = devm_kzalloc(&pdev->dev, struct_size(ad, channels, nchannels), GFP_KERNEL);
if (!ad)
return -ENOMEM;
platform_set_drvdata(pdev, ad);
ad->dev = &pdev->dev;
ad->nchannels = nchannels;
mutex_init(&ad->cache_alloc_lock);
/*
* The controller has 4 IRQ outputs. Try them all until
* we find one we can use.
*/
for (i = 0; i < IRQ_NOUTPUTS; i++) {
irq = platform_get_irq_optional(pdev, i);
if (irq >= 0) {
ad->irq_index = i;
break;
}
}
if (irq < 0)
return dev_err_probe(&pdev->dev, irq, "no usable interrupt\n");
ad->irq = irq;
ad->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(ad->base))
return dev_err_probe(&pdev->dev, PTR_ERR(ad->base),
"unable to obtain MMIO resource\n");
ad->rstc = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
if (IS_ERR(ad->rstc))
return PTR_ERR(ad->rstc);
dma = &ad->dma;
dma_cap_set(DMA_PRIVATE, dma->cap_mask);
dma_cap_set(DMA_CYCLIC, dma->cap_mask);
dma->dev = &pdev->dev;
dma->device_alloc_chan_resources = admac_alloc_chan_resources;
dma->device_free_chan_resources = admac_free_chan_resources;
dma->device_tx_status = admac_tx_status;
dma->device_issue_pending = admac_issue_pending;
dma->device_terminate_all = admac_terminate_all;
dma->device_synchronize = admac_synchronize;
dma->device_prep_dma_cyclic = admac_prep_dma_cyclic;
dma->device_config = admac_device_config;
dma->device_pause = admac_pause;
dma->device_resume = admac_resume;
dma->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
dma->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
dma->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
dma->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
INIT_LIST_HEAD(&dma->channels);
for (i = 0; i < nchannels; i++) {
struct admac_chan *adchan = &ad->channels[i];
adchan->host = ad;
adchan->no = i;
adchan->chan.device = &ad->dma;
spin_lock_init(&adchan->lock);
INIT_LIST_HEAD(&adchan->submitted);
INIT_LIST_HEAD(&adchan->issued);
INIT_LIST_HEAD(&adchan->to_free);
list_add_tail(&adchan->chan.device_node, &dma->channels);
tasklet_setup(&adchan->tasklet, admac_chan_tasklet);
}
err = reset_control_reset(ad->rstc);
if (err)
return dev_err_probe(&pdev->dev, err,
"unable to trigger reset\n");
err = request_irq(irq, admac_interrupt, 0, dev_name(&pdev->dev), ad);
if (err) {
dev_err_probe(&pdev->dev, err,
"unable to register interrupt\n");
goto free_reset;
}
err = dma_async_device_register(&ad->dma);
if (err) {
dev_err_probe(&pdev->dev, err, "failed to register DMA device\n");
goto free_irq;
}
err = of_dma_controller_register(pdev->dev.of_node, admac_dma_of_xlate, ad);
if (err) {
dma_async_device_unregister(&ad->dma);
dev_err_probe(&pdev->dev, err, "failed to register with OF\n");
goto free_irq;
}
ad->txcache.size = readl_relaxed(ad->base + REG_TX_SRAM_SIZE);
ad->rxcache.size = readl_relaxed(ad->base + REG_RX_SRAM_SIZE);
dev_info(&pdev->dev, "Audio DMA Controller\n");
dev_info(&pdev->dev, "imprint %x TX cache %u RX cache %u\n",
readl_relaxed(ad->base + REG_IMPRINT), ad->txcache.size, ad->rxcache.size);
return 0;
free_irq:
free_irq(ad->irq, ad);
free_reset:
reset_control_rearm(ad->rstc);
return err;
}
static int admac_remove(struct platform_device *pdev)
{
struct admac_data *ad = platform_get_drvdata(pdev);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&ad->dma);
free_irq(ad->irq, ad);
reset_control_rearm(ad->rstc);
return 0;
}
static const struct of_device_id admac_of_match[] = {
{ .compatible = "apple,admac", },
{ }
};
MODULE_DEVICE_TABLE(of, admac_of_match);
static struct platform_driver apple_admac_driver = {
.driver = {
.name = "apple-admac",
.of_match_table = admac_of_match,
},
.probe = admac_probe,
.remove = admac_remove,
};
module_platform_driver(apple_admac_driver);
MODULE_AUTHOR("Martin Povišer <[email protected]>");
MODULE_DESCRIPTION("Driver for Audio DMA Controller (ADMAC) on Apple SoCs");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/apple-admac.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drivers/dma/fsl-edma.c
*
* Copyright 2013-2014 Freescale Semiconductor, Inc.
*
* Driver for the Freescale eDMA engine with flexible channel multiplexing
* capability for DMA request sources. The eDMA block can be found on some
* Vybrid and Layerscape SoCs.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_dma.h>
#include <linux/dma-mapping.h>
#include <linux/pm_runtime.h>
#include <linux/pm_domain.h>
#include "fsl-edma-common.h"
#define ARGS_RX BIT(0)
#define ARGS_REMOTE BIT(1)
#define ARGS_MULTI_FIFO BIT(2)
static void fsl_edma_synchronize(struct dma_chan *chan)
{
struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
vchan_synchronize(&fsl_chan->vchan);
}
static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *fsl_edma = dev_id;
unsigned int intr, ch;
struct edma_regs *regs = &fsl_edma->regs;
intr = edma_readl(fsl_edma, regs->intl);
if (!intr)
return IRQ_NONE;
for (ch = 0; ch < fsl_edma->n_chans; ch++) {
if (intr & (0x1 << ch)) {
edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), regs->cint);
fsl_edma_tx_chan_handler(&fsl_edma->chans[ch]);
}
}
return IRQ_HANDLED;
}
static irqreturn_t fsl_edma3_tx_handler(int irq, void *dev_id)
{
struct fsl_edma_chan *fsl_chan = dev_id;
unsigned int intr;
intr = edma_readl_chreg(fsl_chan, ch_int);
if (!intr)
return IRQ_HANDLED;
edma_writel_chreg(fsl_chan, 1, ch_int);
fsl_edma_tx_chan_handler(fsl_chan);
return IRQ_HANDLED;
}
static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *fsl_edma = dev_id;
unsigned int err, ch;
struct edma_regs *regs = &fsl_edma->regs;
err = edma_readl(fsl_edma, regs->errl);
if (!err)
return IRQ_NONE;
for (ch = 0; ch < fsl_edma->n_chans; ch++) {
if (err & (0x1 << ch)) {
fsl_edma_disable_request(&fsl_edma->chans[ch]);
edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), regs->cerr);
fsl_edma_err_chan_handler(&fsl_edma->chans[ch]);
}
}
return IRQ_HANDLED;
}
static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
{
if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED)
return IRQ_HANDLED;
return fsl_edma_err_handler(irq, dev_id);
}
static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
struct dma_chan *chan, *_chan;
struct fsl_edma_chan *fsl_chan;
u32 dmamux_nr = fsl_edma->drvdata->dmamuxs;
unsigned long chans_per_mux = fsl_edma->n_chans / dmamux_nr;
if (dma_spec->args_count != 2)
return NULL;
mutex_lock(&fsl_edma->fsl_edma_mutex);
list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
if (chan->client_count)
continue;
if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
chan = dma_get_slave_channel(chan);
if (chan) {
chan->device->privatecnt++;
fsl_chan = to_fsl_edma_chan(chan);
fsl_chan->slave_id = dma_spec->args[1];
fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id,
true);
mutex_unlock(&fsl_edma->fsl_edma_mutex);
return chan;
}
}
}
mutex_unlock(&fsl_edma->fsl_edma_mutex);
return NULL;
}
static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
struct dma_chan *chan, *_chan;
struct fsl_edma_chan *fsl_chan;
bool b_chmux;
int i;
if (dma_spec->args_count != 3)
return NULL;
b_chmux = !!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_HAS_CHMUX);
mutex_lock(&fsl_edma->fsl_edma_mutex);
list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels,
device_node) {
if (chan->client_count)
continue;
fsl_chan = to_fsl_edma_chan(chan);
i = fsl_chan - fsl_edma->chans;
chan = dma_get_slave_channel(chan);
chan->device->privatecnt++;
fsl_chan->priority = dma_spec->args[1];
fsl_chan->is_rxchan = dma_spec->args[2] & ARGS_RX;
fsl_chan->is_remote = dma_spec->args[2] & ARGS_REMOTE;
fsl_chan->is_multi_fifo = dma_spec->args[2] & ARGS_MULTI_FIFO;
if (!b_chmux && i == dma_spec->args[0]) {
mutex_unlock(&fsl_edma->fsl_edma_mutex);
return chan;
} else if (b_chmux && !fsl_chan->srcid) {
/* if controller support channel mux, choose a free channel */
fsl_chan->srcid = dma_spec->args[0];
mutex_unlock(&fsl_edma->fsl_edma_mutex);
return chan;
}
}
mutex_unlock(&fsl_edma->fsl_edma_mutex);
return NULL;
}
static int
fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
{
int ret;
edma_writel(fsl_edma, ~0, fsl_edma->regs.intl);
fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx");
if (fsl_edma->txirq < 0)
return fsl_edma->txirq;
fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err");
if (fsl_edma->errirq < 0)
return fsl_edma->errirq;
if (fsl_edma->txirq == fsl_edma->errirq) {
ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
fsl_edma_irq_handler, 0, "eDMA", fsl_edma);
if (ret) {
dev_err(&pdev->dev, "Can't register eDMA IRQ.\n");
return ret;
}
} else {
ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma);
if (ret) {
dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n");
return ret;
}
ret = devm_request_irq(&pdev->dev, fsl_edma->errirq,
fsl_edma_err_handler, 0, "eDMA err", fsl_edma);
if (ret) {
dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n");
return ret;
}
}
return 0;
}
static int fsl_edma3_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
{
int ret;
int i;
for (i = 0; i < fsl_edma->n_chans; i++) {
struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
if (fsl_edma->chan_masked & BIT(i))
continue;
/* request channel irq */
fsl_chan->txirq = platform_get_irq(pdev, i);
if (fsl_chan->txirq < 0) {
dev_err(&pdev->dev, "Can't get chan %d's irq.\n", i);
return -EINVAL;
}
ret = devm_request_irq(&pdev->dev, fsl_chan->txirq,
fsl_edma3_tx_handler, IRQF_SHARED,
fsl_chan->chan_name, fsl_chan);
if (ret) {
dev_err(&pdev->dev, "Can't register chan%d's IRQ.\n", i);
return -EINVAL;
}
}
return 0;
}
static int
fsl_edma2_irq_init(struct platform_device *pdev,
struct fsl_edma_engine *fsl_edma)
{
int i, ret, irq;
int count;
edma_writel(fsl_edma, ~0, fsl_edma->regs.intl);
count = platform_irq_count(pdev);
dev_dbg(&pdev->dev, "%s Found %d interrupts\r\n", __func__, count);
if (count <= 2) {
dev_err(&pdev->dev, "Interrupts in DTS not correct.\n");
return -EINVAL;
}
/*
* 16 channel independent interrupts + 1 error interrupt on i.mx7ulp.
* 2 channel share one interrupt, for example, ch0/ch16, ch1/ch17...
* For now, just simply request irq without IRQF_SHARED flag, since 16
* channels are enough on i.mx7ulp whose M4 domain own some peripherals.
*/
for (i = 0; i < count; i++) {
irq = platform_get_irq(pdev, i);
if (irq < 0)
return -ENXIO;
/* The last IRQ is for eDMA err */
if (i == count - 1)
ret = devm_request_irq(&pdev->dev, irq,
fsl_edma_err_handler,
0, "eDMA2-ERR", fsl_edma);
else
ret = devm_request_irq(&pdev->dev, irq,
fsl_edma_tx_handler, 0,
fsl_edma->chans[i].chan_name,
fsl_edma);
if (ret)
return ret;
}
return 0;
}
static void fsl_edma_irq_exit(
struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
{
if (fsl_edma->txirq == fsl_edma->errirq) {
devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
} else {
devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
devm_free_irq(&pdev->dev, fsl_edma->errirq, fsl_edma);
}
}
static void fsl_disable_clocks(struct fsl_edma_engine *fsl_edma, int nr_clocks)
{
int i;
for (i = 0; i < nr_clocks; i++)
clk_disable_unprepare(fsl_edma->muxclk[i]);
}
static struct fsl_edma_drvdata vf610_data = {
.dmamuxs = DMAMUX_NR,
.flags = FSL_EDMA_DRV_WRAP_IO,
.chreg_off = EDMA_TCD,
.chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
.setup_irq = fsl_edma_irq_init,
};
static struct fsl_edma_drvdata ls1028a_data = {
.dmamuxs = DMAMUX_NR,
.flags = FSL_EDMA_DRV_MUX_SWAP | FSL_EDMA_DRV_WRAP_IO,
.chreg_off = EDMA_TCD,
.chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
.setup_irq = fsl_edma_irq_init,
};
static struct fsl_edma_drvdata imx7ulp_data = {
.dmamuxs = 1,
.chreg_off = EDMA_TCD,
.chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
.flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_CONFIG32,
.setup_irq = fsl_edma2_irq_init,
};
static struct fsl_edma_drvdata imx8qm_data = {
.flags = FSL_EDMA_DRV_HAS_PD | FSL_EDMA_DRV_EDMA3,
.chreg_space_sz = 0x10000,
.chreg_off = 0x10000,
.setup_irq = fsl_edma3_irq_init,
};
static struct fsl_edma_drvdata imx8qm_audio_data = {
.flags = FSL_EDMA_DRV_QUIRK_SWAPPED | FSL_EDMA_DRV_HAS_PD | FSL_EDMA_DRV_EDMA3,
.chreg_space_sz = 0x10000,
.chreg_off = 0x10000,
.setup_irq = fsl_edma3_irq_init,
};
static struct fsl_edma_drvdata imx93_data3 = {
.flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA3,
.chreg_space_sz = 0x10000,
.chreg_off = 0x10000,
.setup_irq = fsl_edma3_irq_init,
};
static struct fsl_edma_drvdata imx93_data4 = {
.flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA3,
.chreg_space_sz = 0x8000,
.chreg_off = 0x10000,
.setup_irq = fsl_edma3_irq_init,
};
static const struct of_device_id fsl_edma_dt_ids[] = {
{ .compatible = "fsl,vf610-edma", .data = &vf610_data},
{ .compatible = "fsl,ls1028a-edma", .data = &ls1028a_data},
{ .compatible = "fsl,imx7ulp-edma", .data = &imx7ulp_data},
{ .compatible = "fsl,imx8qm-edma", .data = &imx8qm_data},
{ .compatible = "fsl,imx8qm-adma", .data = &imx8qm_audio_data},
{ .compatible = "fsl,imx93-edma3", .data = &imx93_data3},
{ .compatible = "fsl,imx93-edma4", .data = &imx93_data4},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
static int fsl_edma3_attach_pd(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
{
struct fsl_edma_chan *fsl_chan;
struct device_link *link;
struct device *pd_chan;
struct device *dev;
int i;
dev = &pdev->dev;
for (i = 0; i < fsl_edma->n_chans; i++) {
if (fsl_edma->chan_masked & BIT(i))
continue;
fsl_chan = &fsl_edma->chans[i];
pd_chan = dev_pm_domain_attach_by_id(dev, i);
if (IS_ERR_OR_NULL(pd_chan)) {
dev_err(dev, "Failed attach pd %d\n", i);
return -EINVAL;
}
link = device_link_add(dev, pd_chan, DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
if (IS_ERR(link)) {
dev_err(dev, "Failed to add device_link to %d: %ld\n", i,
PTR_ERR(link));
return -EINVAL;
}
fsl_chan->pd_dev = pd_chan;
pm_runtime_use_autosuspend(fsl_chan->pd_dev);
pm_runtime_set_autosuspend_delay(fsl_chan->pd_dev, 200);
pm_runtime_set_active(fsl_chan->pd_dev);
}
return 0;
}
static int fsl_edma_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(fsl_edma_dt_ids, &pdev->dev);
struct device_node *np = pdev->dev.of_node;
struct fsl_edma_engine *fsl_edma;
const struct fsl_edma_drvdata *drvdata = NULL;
u32 chan_mask[2] = {0, 0};
struct edma_regs *regs;
int chans;
int ret, i;
if (of_id)
drvdata = of_id->data;
if (!drvdata) {
dev_err(&pdev->dev, "unable to find driver data\n");
return -EINVAL;
}
ret = of_property_read_u32(np, "dma-channels", &chans);
if (ret) {
dev_err(&pdev->dev, "Can't get dma-channels.\n");
return ret;
}
fsl_edma = devm_kzalloc(&pdev->dev, struct_size(fsl_edma, chans, chans),
GFP_KERNEL);
if (!fsl_edma)
return -ENOMEM;
fsl_edma->drvdata = drvdata;
fsl_edma->n_chans = chans;
mutex_init(&fsl_edma->fsl_edma_mutex);
fsl_edma->membase = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(fsl_edma->membase))
return PTR_ERR(fsl_edma->membase);
if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)) {
fsl_edma_setup_regs(fsl_edma);
regs = &fsl_edma->regs;
}
if (drvdata->flags & FSL_EDMA_DRV_HAS_DMACLK) {
fsl_edma->dmaclk = devm_clk_get_enabled(&pdev->dev, "dma");
if (IS_ERR(fsl_edma->dmaclk)) {
dev_err(&pdev->dev, "Missing DMA block clock.\n");
return PTR_ERR(fsl_edma->dmaclk);
}
}
if (drvdata->flags & FSL_EDMA_DRV_HAS_CHCLK) {
fsl_edma->chclk = devm_clk_get_enabled(&pdev->dev, "mp");
if (IS_ERR(fsl_edma->chclk)) {
dev_err(&pdev->dev, "Missing MP block clock.\n");
return PTR_ERR(fsl_edma->chclk);
}
}
ret = of_property_read_variable_u32_array(np, "dma-channel-mask", chan_mask, 1, 2);
if (ret > 0) {
fsl_edma->chan_masked = chan_mask[1];
fsl_edma->chan_masked <<= 32;
fsl_edma->chan_masked |= chan_mask[0];
}
for (i = 0; i < fsl_edma->drvdata->dmamuxs; i++) {
char clkname[32];
/* eDMAv3 mux register move to TCD area if ch_mux exist */
if (drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)
break;
fsl_edma->muxbase[i] = devm_platform_ioremap_resource(pdev,
1 + i);
if (IS_ERR(fsl_edma->muxbase[i])) {
/* on error: disable all previously enabled clks */
fsl_disable_clocks(fsl_edma, i);
return PTR_ERR(fsl_edma->muxbase[i]);
}
sprintf(clkname, "dmamux%d", i);
fsl_edma->muxclk[i] = devm_clk_get_enabled(&pdev->dev, clkname);
if (IS_ERR(fsl_edma->muxclk[i])) {
dev_err(&pdev->dev, "Missing DMAMUX block clock.\n");
/* on error: disable all previously enabled clks */
return PTR_ERR(fsl_edma->muxclk[i]);
}
}
fsl_edma->big_endian = of_property_read_bool(np, "big-endian");
if (drvdata->flags & FSL_EDMA_DRV_HAS_PD) {
ret = fsl_edma3_attach_pd(pdev, fsl_edma);
if (ret)
return ret;
}
INIT_LIST_HEAD(&fsl_edma->dma_dev.channels);
for (i = 0; i < fsl_edma->n_chans; i++) {
struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
int len;
if (fsl_edma->chan_masked & BIT(i))
continue;
snprintf(fsl_chan->chan_name, sizeof(fsl_chan->chan_name), "%s-CH%02d",
dev_name(&pdev->dev), i);
fsl_chan->edma = fsl_edma;
fsl_chan->pm_state = RUNNING;
fsl_chan->slave_id = 0;
fsl_chan->idle = true;
fsl_chan->dma_dir = DMA_NONE;
fsl_chan->vchan.desc_free = fsl_edma_free_desc;
len = (drvdata->flags & FSL_EDMA_DRV_SPLIT_REG) ?
offsetof(struct fsl_edma3_ch_reg, tcd) : 0;
fsl_chan->tcd = fsl_edma->membase
+ i * drvdata->chreg_space_sz + drvdata->chreg_off + len;
fsl_chan->pdev = pdev;
vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
edma_write_tcdreg(fsl_chan, 0, csr);
fsl_edma_chan_mux(fsl_chan, 0, false);
}
ret = fsl_edma->drvdata->setup_irq(pdev, fsl_edma);
if (ret)
return ret;
dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask);
dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask);
dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask);
dma_cap_set(DMA_MEMCPY, fsl_edma->dma_dev.cap_mask);
fsl_edma->dma_dev.dev = &pdev->dev;
fsl_edma->dma_dev.device_alloc_chan_resources
= fsl_edma_alloc_chan_resources;
fsl_edma->dma_dev.device_free_chan_resources
= fsl_edma_free_chan_resources;
fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic;
fsl_edma->dma_dev.device_prep_dma_memcpy = fsl_edma_prep_memcpy;
fsl_edma->dma_dev.device_config = fsl_edma_slave_config;
fsl_edma->dma_dev.device_pause = fsl_edma_pause;
fsl_edma->dma_dev.device_resume = fsl_edma_resume;
fsl_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
fsl_edma->dma_dev.device_synchronize = fsl_edma_synchronize;
fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
fsl_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
fsl_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
if (drvdata->flags & FSL_EDMA_DRV_BUS_8BYTE) {
fsl_edma->dma_dev.src_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
fsl_edma->dma_dev.dst_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
}
fsl_edma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
if (drvdata->flags & FSL_EDMA_DRV_DEV_TO_DEV)
fsl_edma->dma_dev.directions |= BIT(DMA_DEV_TO_DEV);
fsl_edma->dma_dev.copy_align = drvdata->flags & FSL_EDMA_DRV_ALIGN_64BYTE ?
DMAENGINE_ALIGN_64_BYTES :
DMAENGINE_ALIGN_32_BYTES;
/* Per worst case 'nbytes = 1' take CITER as the max_seg_size */
dma_set_max_seg_size(fsl_edma->dma_dev.dev, 0x3fff);
fsl_edma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
platform_set_drvdata(pdev, fsl_edma);
ret = dma_async_device_register(&fsl_edma->dma_dev);
if (ret) {
dev_err(&pdev->dev,
"Can't register Freescale eDMA engine. (%d)\n", ret);
return ret;
}
ret = of_dma_controller_register(np,
drvdata->flags & FSL_EDMA_DRV_SPLIT_REG ? fsl_edma3_xlate : fsl_edma_xlate,
fsl_edma);
if (ret) {
dev_err(&pdev->dev,
"Can't register Freescale eDMA of_dma. (%d)\n", ret);
dma_async_device_unregister(&fsl_edma->dma_dev);
return ret;
}
/* enable round robin arbitration */
if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG))
edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
return 0;
}
static int fsl_edma_remove(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev);
fsl_edma_irq_exit(pdev, fsl_edma);
fsl_edma_cleanup_vchan(&fsl_edma->dma_dev);
of_dma_controller_free(np);
dma_async_device_unregister(&fsl_edma->dma_dev);
fsl_disable_clocks(fsl_edma, fsl_edma->drvdata->dmamuxs);
return 0;
}
static int fsl_edma_suspend_late(struct device *dev)
{
struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
struct fsl_edma_chan *fsl_chan;
unsigned long flags;
int i;
for (i = 0; i < fsl_edma->n_chans; i++) {
fsl_chan = &fsl_edma->chans[i];
spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
/* Make sure chan is idle or will force disable. */
if (unlikely(!fsl_chan->idle)) {
dev_warn(dev, "WARN: There is non-idle channel.");
fsl_edma_disable_request(fsl_chan);
fsl_edma_chan_mux(fsl_chan, 0, false);
}
fsl_chan->pm_state = SUSPENDED;
spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
}
return 0;
}
static int fsl_edma_resume_early(struct device *dev)
{
struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
struct fsl_edma_chan *fsl_chan;
struct edma_regs *regs = &fsl_edma->regs;
int i;
for (i = 0; i < fsl_edma->n_chans; i++) {
fsl_chan = &fsl_edma->chans[i];
fsl_chan->pm_state = RUNNING;
edma_write_tcdreg(fsl_chan, 0, csr);
if (fsl_chan->slave_id != 0)
fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, true);
}
edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
return 0;
}
/*
* eDMA provides the service to others, so it should be suspend late
* and resume early. When eDMA suspend, all of the clients should stop
* the DMA data transmission and let the channel idle.
*/
static const struct dev_pm_ops fsl_edma_pm_ops = {
.suspend_late = fsl_edma_suspend_late,
.resume_early = fsl_edma_resume_early,
};
static struct platform_driver fsl_edma_driver = {
.driver = {
.name = "fsl-edma",
.of_match_table = fsl_edma_dt_ids,
.pm = &fsl_edma_pm_ops,
},
.probe = fsl_edma_probe,
.remove = fsl_edma_remove,
};
static int __init fsl_edma_init(void)
{
return platform_driver_register(&fsl_edma_driver);
}
subsys_initcall(fsl_edma_init);
static void __exit fsl_edma_exit(void)
{
platform_driver_unregister(&fsl_edma_driver);
}
module_exit(fsl_edma_exit);
MODULE_ALIAS("platform:fsl-edma");
MODULE_DESCRIPTION("Freescale eDMA engine driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/fsl-edma-main.c |
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2019-2022 HiSilicon Limited. */
#include <linux/bitfield.h>
#include <linux/dmaengine.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include "virt-dma.h"
/* HiSilicon DMA register common field define */
#define HISI_DMA_Q_SQ_BASE_L 0x0
#define HISI_DMA_Q_SQ_BASE_H 0x4
#define HISI_DMA_Q_SQ_DEPTH 0x8
#define HISI_DMA_Q_SQ_TAIL_PTR 0xc
#define HISI_DMA_Q_CQ_BASE_L 0x10
#define HISI_DMA_Q_CQ_BASE_H 0x14
#define HISI_DMA_Q_CQ_DEPTH 0x18
#define HISI_DMA_Q_CQ_HEAD_PTR 0x1c
#define HISI_DMA_Q_CTRL0 0x20
#define HISI_DMA_Q_CTRL0_QUEUE_EN BIT(0)
#define HISI_DMA_Q_CTRL0_QUEUE_PAUSE BIT(4)
#define HISI_DMA_Q_CTRL1 0x24
#define HISI_DMA_Q_CTRL1_QUEUE_RESET BIT(0)
#define HISI_DMA_Q_FSM_STS 0x30
#define HISI_DMA_Q_FSM_STS_MASK GENMASK(3, 0)
#define HISI_DMA_Q_ERR_INT_NUM0 0x84
#define HISI_DMA_Q_ERR_INT_NUM1 0x88
#define HISI_DMA_Q_ERR_INT_NUM2 0x8c
/* HiSilicon IP08 DMA register and field define */
#define HISI_DMA_HIP08_MODE 0x217C
#define HISI_DMA_HIP08_Q_BASE 0x0
#define HISI_DMA_HIP08_Q_CTRL0_ERR_ABORT_EN BIT(2)
#define HISI_DMA_HIP08_Q_INT_STS 0x40
#define HISI_DMA_HIP08_Q_INT_MSK 0x44
#define HISI_DMA_HIP08_Q_INT_STS_MASK GENMASK(14, 0)
#define HISI_DMA_HIP08_Q_ERR_INT_NUM3 0x90
#define HISI_DMA_HIP08_Q_ERR_INT_NUM4 0x94
#define HISI_DMA_HIP08_Q_ERR_INT_NUM5 0x98
#define HISI_DMA_HIP08_Q_ERR_INT_NUM6 0x48
#define HISI_DMA_HIP08_Q_CTRL0_SQCQ_DRCT BIT(24)
/* HiSilicon IP09 DMA register and field define */
#define HISI_DMA_HIP09_DMA_FLR_DISABLE 0xA00
#define HISI_DMA_HIP09_DMA_FLR_DISABLE_B BIT(0)
#define HISI_DMA_HIP09_Q_BASE 0x2000
#define HISI_DMA_HIP09_Q_CTRL0_ERR_ABORT_EN GENMASK(31, 28)
#define HISI_DMA_HIP09_Q_CTRL0_SQ_DRCT BIT(26)
#define HISI_DMA_HIP09_Q_CTRL0_CQ_DRCT BIT(27)
#define HISI_DMA_HIP09_Q_CTRL1_VA_ENABLE BIT(2)
#define HISI_DMA_HIP09_Q_INT_STS 0x40
#define HISI_DMA_HIP09_Q_INT_MSK 0x44
#define HISI_DMA_HIP09_Q_INT_STS_MASK 0x1
#define HISI_DMA_HIP09_Q_ERR_INT_STS 0x48
#define HISI_DMA_HIP09_Q_ERR_INT_MSK 0x4C
#define HISI_DMA_HIP09_Q_ERR_INT_STS_MASK GENMASK(18, 1)
#define HISI_DMA_HIP09_PORT_CFG_REG(port_id) (0x800 + \
(port_id) * 0x20)
#define HISI_DMA_HIP09_PORT_CFG_LINK_DOWN_MASK_B BIT(16)
#define HISI_DMA_HIP09_MAX_PORT_NUM 16
#define HISI_DMA_HIP08_MSI_NUM 32
#define HISI_DMA_HIP08_CHAN_NUM 30
#define HISI_DMA_HIP09_MSI_NUM 4
#define HISI_DMA_HIP09_CHAN_NUM 4
#define HISI_DMA_REVISION_HIP08B 0x21
#define HISI_DMA_REVISION_HIP09A 0x30
#define HISI_DMA_Q_OFFSET 0x100
#define HISI_DMA_Q_DEPTH_VAL 1024
#define PCI_BAR_2 2
#define HISI_DMA_POLL_Q_STS_DELAY_US 10
#define HISI_DMA_POLL_Q_STS_TIME_OUT_US 1000
#define HISI_DMA_MAX_DIR_NAME_LEN 128
/*
* The HIP08B(HiSilicon IP08) and HIP09A(HiSilicon IP09) are DMA iEPs, they
* have the same pci device id but different pci revision.
* Unfortunately, they have different register layouts, so two layout
* enumerations are defined.
*/
enum hisi_dma_reg_layout {
HISI_DMA_REG_LAYOUT_INVALID = 0,
HISI_DMA_REG_LAYOUT_HIP08,
HISI_DMA_REG_LAYOUT_HIP09
};
enum hisi_dma_mode {
EP = 0,
RC,
};
enum hisi_dma_chan_status {
DISABLE = -1,
IDLE = 0,
RUN,
CPL,
PAUSE,
HALT,
ABORT,
WAIT,
BUFFCLR,
};
struct hisi_dma_sqe {
__le32 dw0;
#define OPCODE_MASK GENMASK(3, 0)
#define OPCODE_SMALL_PACKAGE 0x1
#define OPCODE_M2M 0x4
#define LOCAL_IRQ_EN BIT(8)
#define ATTR_SRC_MASK GENMASK(14, 12)
__le32 dw1;
__le32 dw2;
#define ATTR_DST_MASK GENMASK(26, 24)
__le32 length;
__le64 src_addr;
__le64 dst_addr;
};
struct hisi_dma_cqe {
__le32 rsv0;
__le32 rsv1;
__le16 sq_head;
__le16 rsv2;
__le16 rsv3;
__le16 w0;
#define STATUS_MASK GENMASK(15, 1)
#define STATUS_SUCC 0x0
#define VALID_BIT BIT(0)
};
struct hisi_dma_desc {
struct virt_dma_desc vd;
struct hisi_dma_sqe sqe;
};
struct hisi_dma_chan {
struct virt_dma_chan vc;
struct hisi_dma_dev *hdma_dev;
struct hisi_dma_sqe *sq;
struct hisi_dma_cqe *cq;
dma_addr_t sq_dma;
dma_addr_t cq_dma;
u32 sq_tail;
u32 cq_head;
u32 qp_num;
enum hisi_dma_chan_status status;
struct hisi_dma_desc *desc;
};
struct hisi_dma_dev {
struct pci_dev *pdev;
void __iomem *base;
struct dma_device dma_dev;
u32 chan_num;
u32 chan_depth;
enum hisi_dma_reg_layout reg_layout;
void __iomem *queue_base; /* queue region start of register */
struct hisi_dma_chan chan[];
};
#ifdef CONFIG_DEBUG_FS
static const struct debugfs_reg32 hisi_dma_comm_chan_regs[] = {
{"DMA_QUEUE_SQ_DEPTH ", 0x0008ull},
{"DMA_QUEUE_SQ_TAIL_PTR ", 0x000Cull},
{"DMA_QUEUE_CQ_DEPTH ", 0x0018ull},
{"DMA_QUEUE_CQ_HEAD_PTR ", 0x001Cull},
{"DMA_QUEUE_CTRL0 ", 0x0020ull},
{"DMA_QUEUE_CTRL1 ", 0x0024ull},
{"DMA_QUEUE_FSM_STS ", 0x0030ull},
{"DMA_QUEUE_SQ_STS ", 0x0034ull},
{"DMA_QUEUE_CQ_TAIL_PTR ", 0x003Cull},
{"DMA_QUEUE_INT_STS ", 0x0040ull},
{"DMA_QUEUE_INT_MSK ", 0x0044ull},
{"DMA_QUEUE_INT_RO ", 0x006Cull},
};
static const struct debugfs_reg32 hisi_dma_hip08_chan_regs[] = {
{"DMA_QUEUE_BYTE_CNT ", 0x0038ull},
{"DMA_ERR_INT_NUM6 ", 0x0048ull},
{"DMA_QUEUE_DESP0 ", 0x0050ull},
{"DMA_QUEUE_DESP1 ", 0x0054ull},
{"DMA_QUEUE_DESP2 ", 0x0058ull},
{"DMA_QUEUE_DESP3 ", 0x005Cull},
{"DMA_QUEUE_DESP4 ", 0x0074ull},
{"DMA_QUEUE_DESP5 ", 0x0078ull},
{"DMA_QUEUE_DESP6 ", 0x007Cull},
{"DMA_QUEUE_DESP7 ", 0x0080ull},
{"DMA_ERR_INT_NUM0 ", 0x0084ull},
{"DMA_ERR_INT_NUM1 ", 0x0088ull},
{"DMA_ERR_INT_NUM2 ", 0x008Cull},
{"DMA_ERR_INT_NUM3 ", 0x0090ull},
{"DMA_ERR_INT_NUM4 ", 0x0094ull},
{"DMA_ERR_INT_NUM5 ", 0x0098ull},
{"DMA_QUEUE_SQ_STS2 ", 0x00A4ull},
};
static const struct debugfs_reg32 hisi_dma_hip09_chan_regs[] = {
{"DMA_QUEUE_ERR_INT_STS ", 0x0048ull},
{"DMA_QUEUE_ERR_INT_MSK ", 0x004Cull},
{"DFX_SQ_READ_ERR_PTR ", 0x0068ull},
{"DFX_DMA_ERR_INT_NUM0 ", 0x0084ull},
{"DFX_DMA_ERR_INT_NUM1 ", 0x0088ull},
{"DFX_DMA_ERR_INT_NUM2 ", 0x008Cull},
{"DFX_DMA_QUEUE_SQ_STS2 ", 0x00A4ull},
};
static const struct debugfs_reg32 hisi_dma_hip08_comm_regs[] = {
{"DMA_ECC_ERR_ADDR ", 0x2004ull},
{"DMA_ECC_ECC_CNT ", 0x2014ull},
{"COMMON_AND_CH_ERR_STS ", 0x2030ull},
{"LOCAL_CPL_ID_STS_0 ", 0x20E0ull},
{"LOCAL_CPL_ID_STS_1 ", 0x20E4ull},
{"LOCAL_CPL_ID_STS_2 ", 0x20E8ull},
{"LOCAL_CPL_ID_STS_3 ", 0x20ECull},
{"LOCAL_TLP_NUM ", 0x2158ull},
{"SQCQ_TLP_NUM ", 0x2164ull},
{"CPL_NUM ", 0x2168ull},
{"INF_BACK_PRESS_STS ", 0x2170ull},
{"DMA_CH_RAS_LEVEL ", 0x2184ull},
{"DMA_CM_RAS_LEVEL ", 0x2188ull},
{"DMA_CH_ERR_STS ", 0x2190ull},
{"DMA_CH_DONE_STS ", 0x2194ull},
{"DMA_SQ_TAG_STS_0 ", 0x21A0ull},
{"DMA_SQ_TAG_STS_1 ", 0x21A4ull},
{"DMA_SQ_TAG_STS_2 ", 0x21A8ull},
{"DMA_SQ_TAG_STS_3 ", 0x21ACull},
{"LOCAL_P_ID_STS_0 ", 0x21B0ull},
{"LOCAL_P_ID_STS_1 ", 0x21B4ull},
{"LOCAL_P_ID_STS_2 ", 0x21B8ull},
{"LOCAL_P_ID_STS_3 ", 0x21BCull},
{"DMA_PREBUFF_INFO_0 ", 0x2200ull},
{"DMA_CM_TABLE_INFO_0 ", 0x2220ull},
{"DMA_CM_CE_RO ", 0x2244ull},
{"DMA_CM_NFE_RO ", 0x2248ull},
{"DMA_CM_FE_RO ", 0x224Cull},
};
static const struct debugfs_reg32 hisi_dma_hip09_comm_regs[] = {
{"COMMON_AND_CH_ERR_STS ", 0x0030ull},
{"DMA_PORT_IDLE_STS ", 0x0150ull},
{"DMA_CH_RAS_LEVEL ", 0x0184ull},
{"DMA_CM_RAS_LEVEL ", 0x0188ull},
{"DMA_CM_CE_RO ", 0x0244ull},
{"DMA_CM_NFE_RO ", 0x0248ull},
{"DMA_CM_FE_RO ", 0x024Cull},
{"DFX_INF_BACK_PRESS_STS0 ", 0x1A40ull},
{"DFX_INF_BACK_PRESS_STS1 ", 0x1A44ull},
{"DFX_INF_BACK_PRESS_STS2 ", 0x1A48ull},
{"DFX_DMA_WRR_DISABLE ", 0x1A4Cull},
{"DFX_PA_REQ_TLP_NUM ", 0x1C00ull},
{"DFX_PA_BACK_TLP_NUM ", 0x1C04ull},
{"DFX_PA_RETRY_TLP_NUM ", 0x1C08ull},
{"DFX_LOCAL_NP_TLP_NUM ", 0x1C0Cull},
{"DFX_LOCAL_CPL_HEAD_TLP_NUM ", 0x1C10ull},
{"DFX_LOCAL_CPL_DATA_TLP_NUM ", 0x1C14ull},
{"DFX_LOCAL_CPL_EXT_DATA_TLP_NUM ", 0x1C18ull},
{"DFX_LOCAL_P_HEAD_TLP_NUM ", 0x1C1Cull},
{"DFX_LOCAL_P_ACK_TLP_NUM ", 0x1C20ull},
{"DFX_BUF_ALOC_PORT_REQ_NUM ", 0x1C24ull},
{"DFX_BUF_ALOC_PORT_RESULT_NUM ", 0x1C28ull},
{"DFX_BUF_FAIL_SIZE_NUM ", 0x1C2Cull},
{"DFX_BUF_ALOC_SIZE_NUM ", 0x1C30ull},
{"DFX_BUF_NP_RELEASE_SIZE_NUM ", 0x1C34ull},
{"DFX_BUF_P_RELEASE_SIZE_NUM ", 0x1C38ull},
{"DFX_BUF_PORT_RELEASE_SIZE_NUM ", 0x1C3Cull},
{"DFX_DMA_PREBUF_MEM0_ECC_ERR_ADDR ", 0x1CA8ull},
{"DFX_DMA_PREBUF_MEM0_ECC_CNT ", 0x1CACull},
{"DFX_DMA_LOC_NP_OSTB_ECC_ERR_ADDR ", 0x1CB0ull},
{"DFX_DMA_LOC_NP_OSTB_ECC_CNT ", 0x1CB4ull},
{"DFX_DMA_PREBUF_MEM1_ECC_ERR_ADDR ", 0x1CC0ull},
{"DFX_DMA_PREBUF_MEM1_ECC_CNT ", 0x1CC4ull},
{"DMA_CH_DONE_STS ", 0x02E0ull},
{"DMA_CH_ERR_STS ", 0x0320ull},
};
#endif /* CONFIG_DEBUG_FS*/
static enum hisi_dma_reg_layout hisi_dma_get_reg_layout(struct pci_dev *pdev)
{
if (pdev->revision == HISI_DMA_REVISION_HIP08B)
return HISI_DMA_REG_LAYOUT_HIP08;
else if (pdev->revision >= HISI_DMA_REVISION_HIP09A)
return HISI_DMA_REG_LAYOUT_HIP09;
return HISI_DMA_REG_LAYOUT_INVALID;
}
static u32 hisi_dma_get_chan_num(struct pci_dev *pdev)
{
if (pdev->revision == HISI_DMA_REVISION_HIP08B)
return HISI_DMA_HIP08_CHAN_NUM;
return HISI_DMA_HIP09_CHAN_NUM;
}
static u32 hisi_dma_get_msi_num(struct pci_dev *pdev)
{
if (pdev->revision == HISI_DMA_REVISION_HIP08B)
return HISI_DMA_HIP08_MSI_NUM;
return HISI_DMA_HIP09_MSI_NUM;
}
static u32 hisi_dma_get_queue_base(struct pci_dev *pdev)
{
if (pdev->revision == HISI_DMA_REVISION_HIP08B)
return HISI_DMA_HIP08_Q_BASE;
return HISI_DMA_HIP09_Q_BASE;
}
static inline struct hisi_dma_chan *to_hisi_dma_chan(struct dma_chan *c)
{
return container_of(c, struct hisi_dma_chan, vc.chan);
}
static inline struct hisi_dma_desc *to_hisi_dma_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct hisi_dma_desc, vd);
}
static inline void hisi_dma_chan_write(void __iomem *base, u32 reg, u32 index,
u32 val)
{
writel_relaxed(val, base + reg + index * HISI_DMA_Q_OFFSET);
}
static inline void hisi_dma_update_bit(void __iomem *addr, u32 pos, bool val)
{
u32 tmp;
tmp = readl_relaxed(addr);
tmp = val ? tmp | pos : tmp & ~pos;
writel_relaxed(tmp, addr);
}
static void hisi_dma_pause_dma(struct hisi_dma_dev *hdma_dev, u32 index,
bool pause)
{
void __iomem *addr;
addr = hdma_dev->queue_base + HISI_DMA_Q_CTRL0 +
index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_Q_CTRL0_QUEUE_PAUSE, pause);
}
static void hisi_dma_enable_dma(struct hisi_dma_dev *hdma_dev, u32 index,
bool enable)
{
void __iomem *addr;
addr = hdma_dev->queue_base + HISI_DMA_Q_CTRL0 +
index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_Q_CTRL0_QUEUE_EN, enable);
}
static void hisi_dma_mask_irq(struct hisi_dma_dev *hdma_dev, u32 qp_index)
{
void __iomem *q_base = hdma_dev->queue_base;
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08)
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_INT_MSK,
qp_index, HISI_DMA_HIP08_Q_INT_STS_MASK);
else {
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_INT_MSK,
qp_index, HISI_DMA_HIP09_Q_INT_STS_MASK);
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_ERR_INT_MSK,
qp_index,
HISI_DMA_HIP09_Q_ERR_INT_STS_MASK);
}
}
static void hisi_dma_unmask_irq(struct hisi_dma_dev *hdma_dev, u32 qp_index)
{
void __iomem *q_base = hdma_dev->queue_base;
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08) {
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_INT_STS,
qp_index, HISI_DMA_HIP08_Q_INT_STS_MASK);
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_INT_MSK,
qp_index, 0);
} else {
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_INT_STS,
qp_index, HISI_DMA_HIP09_Q_INT_STS_MASK);
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_ERR_INT_STS,
qp_index,
HISI_DMA_HIP09_Q_ERR_INT_STS_MASK);
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_INT_MSK,
qp_index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_HIP09_Q_ERR_INT_MSK,
qp_index, 0);
}
}
static void hisi_dma_do_reset(struct hisi_dma_dev *hdma_dev, u32 index)
{
void __iomem *addr;
addr = hdma_dev->queue_base +
HISI_DMA_Q_CTRL1 + index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_Q_CTRL1_QUEUE_RESET, 1);
}
static void hisi_dma_reset_qp_point(struct hisi_dma_dev *hdma_dev, u32 index)
{
void __iomem *q_base = hdma_dev->queue_base;
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_TAIL_PTR, index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_HEAD_PTR, index, 0);
}
static void hisi_dma_reset_or_disable_hw_chan(struct hisi_dma_chan *chan,
bool disable)
{
struct hisi_dma_dev *hdma_dev = chan->hdma_dev;
u32 index = chan->qp_num, tmp;
void __iomem *addr;
int ret;
hisi_dma_pause_dma(hdma_dev, index, true);
hisi_dma_enable_dma(hdma_dev, index, false);
hisi_dma_mask_irq(hdma_dev, index);
addr = hdma_dev->queue_base +
HISI_DMA_Q_FSM_STS + index * HISI_DMA_Q_OFFSET;
ret = readl_relaxed_poll_timeout(addr, tmp,
FIELD_GET(HISI_DMA_Q_FSM_STS_MASK, tmp) != RUN,
HISI_DMA_POLL_Q_STS_DELAY_US, HISI_DMA_POLL_Q_STS_TIME_OUT_US);
if (ret) {
dev_err(&hdma_dev->pdev->dev, "disable channel timeout!\n");
WARN_ON(1);
}
hisi_dma_do_reset(hdma_dev, index);
hisi_dma_reset_qp_point(hdma_dev, index);
hisi_dma_pause_dma(hdma_dev, index, false);
if (!disable) {
hisi_dma_enable_dma(hdma_dev, index, true);
hisi_dma_unmask_irq(hdma_dev, index);
}
ret = readl_relaxed_poll_timeout(addr, tmp,
FIELD_GET(HISI_DMA_Q_FSM_STS_MASK, tmp) == IDLE,
HISI_DMA_POLL_Q_STS_DELAY_US, HISI_DMA_POLL_Q_STS_TIME_OUT_US);
if (ret) {
dev_err(&hdma_dev->pdev->dev, "reset channel timeout!\n");
WARN_ON(1);
}
}
static void hisi_dma_free_chan_resources(struct dma_chan *c)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
struct hisi_dma_dev *hdma_dev = chan->hdma_dev;
hisi_dma_reset_or_disable_hw_chan(chan, false);
vchan_free_chan_resources(&chan->vc);
memset(chan->sq, 0, sizeof(struct hisi_dma_sqe) * hdma_dev->chan_depth);
memset(chan->cq, 0, sizeof(struct hisi_dma_cqe) * hdma_dev->chan_depth);
chan->sq_tail = 0;
chan->cq_head = 0;
chan->status = DISABLE;
}
static void hisi_dma_desc_free(struct virt_dma_desc *vd)
{
kfree(to_hisi_dma_desc(vd));
}
static struct dma_async_tx_descriptor *
hisi_dma_prep_dma_memcpy(struct dma_chan *c, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
struct hisi_dma_desc *desc;
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
desc->sqe.length = cpu_to_le32(len);
desc->sqe.src_addr = cpu_to_le64(src);
desc->sqe.dst_addr = cpu_to_le64(dst);
return vchan_tx_prep(&chan->vc, &desc->vd, flags);
}
static enum dma_status
hisi_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(c, cookie, txstate);
}
static void hisi_dma_start_transfer(struct hisi_dma_chan *chan)
{
struct hisi_dma_sqe *sqe = chan->sq + chan->sq_tail;
struct hisi_dma_dev *hdma_dev = chan->hdma_dev;
struct hisi_dma_desc *desc;
struct virt_dma_desc *vd;
vd = vchan_next_desc(&chan->vc);
if (!vd) {
chan->desc = NULL;
return;
}
list_del(&vd->node);
desc = to_hisi_dma_desc(vd);
chan->desc = desc;
memcpy(sqe, &desc->sqe, sizeof(struct hisi_dma_sqe));
/* update other field in sqe */
sqe->dw0 = cpu_to_le32(FIELD_PREP(OPCODE_MASK, OPCODE_M2M));
sqe->dw0 |= cpu_to_le32(LOCAL_IRQ_EN);
/* make sure data has been updated in sqe */
wmb();
/* update sq tail, point to new sqe position */
chan->sq_tail = (chan->sq_tail + 1) % hdma_dev->chan_depth;
/* update sq_tail to trigger a new task */
hisi_dma_chan_write(hdma_dev->queue_base, HISI_DMA_Q_SQ_TAIL_PTR,
chan->qp_num, chan->sq_tail);
}
static void hisi_dma_issue_pending(struct dma_chan *c)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
unsigned long flags;
spin_lock_irqsave(&chan->vc.lock, flags);
if (vchan_issue_pending(&chan->vc) && !chan->desc)
hisi_dma_start_transfer(chan);
spin_unlock_irqrestore(&chan->vc.lock, flags);
}
static int hisi_dma_terminate_all(struct dma_chan *c)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&chan->vc.lock, flags);
hisi_dma_pause_dma(chan->hdma_dev, chan->qp_num, true);
if (chan->desc) {
vchan_terminate_vdesc(&chan->desc->vd);
chan->desc = NULL;
}
vchan_get_all_descriptors(&chan->vc, &head);
spin_unlock_irqrestore(&chan->vc.lock, flags);
vchan_dma_desc_free_list(&chan->vc, &head);
hisi_dma_pause_dma(chan->hdma_dev, chan->qp_num, false);
return 0;
}
static void hisi_dma_synchronize(struct dma_chan *c)
{
struct hisi_dma_chan *chan = to_hisi_dma_chan(c);
vchan_synchronize(&chan->vc);
}
static int hisi_dma_alloc_qps_mem(struct hisi_dma_dev *hdma_dev)
{
size_t sq_size = sizeof(struct hisi_dma_sqe) * hdma_dev->chan_depth;
size_t cq_size = sizeof(struct hisi_dma_cqe) * hdma_dev->chan_depth;
struct device *dev = &hdma_dev->pdev->dev;
struct hisi_dma_chan *chan;
int i;
for (i = 0; i < hdma_dev->chan_num; i++) {
chan = &hdma_dev->chan[i];
chan->sq = dmam_alloc_coherent(dev, sq_size, &chan->sq_dma,
GFP_KERNEL);
if (!chan->sq)
return -ENOMEM;
chan->cq = dmam_alloc_coherent(dev, cq_size, &chan->cq_dma,
GFP_KERNEL);
if (!chan->cq)
return -ENOMEM;
}
return 0;
}
static void hisi_dma_init_hw_qp(struct hisi_dma_dev *hdma_dev, u32 index)
{
struct hisi_dma_chan *chan = &hdma_dev->chan[index];
void __iomem *q_base = hdma_dev->queue_base;
u32 hw_depth = hdma_dev->chan_depth - 1;
void __iomem *addr;
u32 tmp;
/* set sq, cq base */
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_BASE_L, index,
lower_32_bits(chan->sq_dma));
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_BASE_H, index,
upper_32_bits(chan->sq_dma));
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_BASE_L, index,
lower_32_bits(chan->cq_dma));
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_BASE_H, index,
upper_32_bits(chan->cq_dma));
/* set sq, cq depth */
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_DEPTH, index, hw_depth);
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_DEPTH, index, hw_depth);
/* init sq tail and cq head */
hisi_dma_chan_write(q_base, HISI_DMA_Q_SQ_TAIL_PTR, index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_HEAD_PTR, index, 0);
/* init error interrupt stats */
hisi_dma_chan_write(q_base, HISI_DMA_Q_ERR_INT_NUM0, index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_Q_ERR_INT_NUM1, index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_Q_ERR_INT_NUM2, index, 0);
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08) {
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_ERR_INT_NUM3,
index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_ERR_INT_NUM4,
index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_ERR_INT_NUM5,
index, 0);
hisi_dma_chan_write(q_base, HISI_DMA_HIP08_Q_ERR_INT_NUM6,
index, 0);
/*
* init SQ/CQ direction selecting register.
* "0" is to local side and "1" is to remote side.
*/
addr = q_base + HISI_DMA_Q_CTRL0 + index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_HIP08_Q_CTRL0_SQCQ_DRCT, 0);
/*
* 0 - Continue to next descriptor if error occurs.
* 1 - Abort the DMA queue if error occurs.
*/
hisi_dma_update_bit(addr,
HISI_DMA_HIP08_Q_CTRL0_ERR_ABORT_EN, 0);
} else {
addr = q_base + HISI_DMA_Q_CTRL0 + index * HISI_DMA_Q_OFFSET;
/*
* init SQ/CQ direction selecting register.
* "0" is to local side and "1" is to remote side.
*/
hisi_dma_update_bit(addr, HISI_DMA_HIP09_Q_CTRL0_SQ_DRCT, 0);
hisi_dma_update_bit(addr, HISI_DMA_HIP09_Q_CTRL0_CQ_DRCT, 0);
/*
* 0 - Continue to next descriptor if error occurs.
* 1 - Abort the DMA queue if error occurs.
*/
tmp = readl_relaxed(addr);
tmp &= ~HISI_DMA_HIP09_Q_CTRL0_ERR_ABORT_EN;
writel_relaxed(tmp, addr);
/*
* 0 - dma should process FLR whith CPU.
* 1 - dma not process FLR, only cpu process FLR.
*/
addr = q_base + HISI_DMA_HIP09_DMA_FLR_DISABLE +
index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_HIP09_DMA_FLR_DISABLE_B, 0);
addr = q_base + HISI_DMA_Q_CTRL1 + index * HISI_DMA_Q_OFFSET;
hisi_dma_update_bit(addr, HISI_DMA_HIP09_Q_CTRL1_VA_ENABLE, 1);
}
}
static void hisi_dma_enable_qp(struct hisi_dma_dev *hdma_dev, u32 qp_index)
{
hisi_dma_init_hw_qp(hdma_dev, qp_index);
hisi_dma_unmask_irq(hdma_dev, qp_index);
hisi_dma_enable_dma(hdma_dev, qp_index, true);
}
static void hisi_dma_disable_qp(struct hisi_dma_dev *hdma_dev, u32 qp_index)
{
hisi_dma_reset_or_disable_hw_chan(&hdma_dev->chan[qp_index], true);
}
static void hisi_dma_enable_qps(struct hisi_dma_dev *hdma_dev)
{
int i;
for (i = 0; i < hdma_dev->chan_num; i++) {
hdma_dev->chan[i].qp_num = i;
hdma_dev->chan[i].hdma_dev = hdma_dev;
hdma_dev->chan[i].vc.desc_free = hisi_dma_desc_free;
vchan_init(&hdma_dev->chan[i].vc, &hdma_dev->dma_dev);
hisi_dma_enable_qp(hdma_dev, i);
}
}
static void hisi_dma_disable_qps(struct hisi_dma_dev *hdma_dev)
{
int i;
for (i = 0; i < hdma_dev->chan_num; i++) {
hisi_dma_disable_qp(hdma_dev, i);
tasklet_kill(&hdma_dev->chan[i].vc.task);
}
}
static irqreturn_t hisi_dma_irq(int irq, void *data)
{
struct hisi_dma_chan *chan = data;
struct hisi_dma_dev *hdma_dev = chan->hdma_dev;
struct hisi_dma_desc *desc;
struct hisi_dma_cqe *cqe;
void __iomem *q_base;
spin_lock(&chan->vc.lock);
desc = chan->desc;
cqe = chan->cq + chan->cq_head;
q_base = hdma_dev->queue_base;
if (desc) {
chan->cq_head = (chan->cq_head + 1) % hdma_dev->chan_depth;
hisi_dma_chan_write(q_base, HISI_DMA_Q_CQ_HEAD_PTR,
chan->qp_num, chan->cq_head);
if (FIELD_GET(STATUS_MASK, cqe->w0) == STATUS_SUCC) {
vchan_cookie_complete(&desc->vd);
hisi_dma_start_transfer(chan);
} else {
dev_err(&hdma_dev->pdev->dev, "task error!\n");
}
}
spin_unlock(&chan->vc.lock);
return IRQ_HANDLED;
}
static int hisi_dma_request_qps_irq(struct hisi_dma_dev *hdma_dev)
{
struct pci_dev *pdev = hdma_dev->pdev;
int i, ret;
for (i = 0; i < hdma_dev->chan_num; i++) {
ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i),
hisi_dma_irq, IRQF_SHARED, "hisi_dma",
&hdma_dev->chan[i]);
if (ret)
return ret;
}
return 0;
}
/* This function enables all hw channels in a device */
static int hisi_dma_enable_hw_channels(struct hisi_dma_dev *hdma_dev)
{
int ret;
ret = hisi_dma_alloc_qps_mem(hdma_dev);
if (ret) {
dev_err(&hdma_dev->pdev->dev, "fail to allocate qp memory!\n");
return ret;
}
ret = hisi_dma_request_qps_irq(hdma_dev);
if (ret) {
dev_err(&hdma_dev->pdev->dev, "fail to request qp irq!\n");
return ret;
}
hisi_dma_enable_qps(hdma_dev);
return 0;
}
static void hisi_dma_disable_hw_channels(void *data)
{
hisi_dma_disable_qps(data);
}
static void hisi_dma_set_mode(struct hisi_dma_dev *hdma_dev,
enum hisi_dma_mode mode)
{
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08)
writel_relaxed(mode == RC ? 1 : 0,
hdma_dev->base + HISI_DMA_HIP08_MODE);
}
static void hisi_dma_init_hw(struct hisi_dma_dev *hdma_dev)
{
void __iomem *addr;
int i;
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP09) {
for (i = 0; i < HISI_DMA_HIP09_MAX_PORT_NUM; i++) {
addr = hdma_dev->base + HISI_DMA_HIP09_PORT_CFG_REG(i);
hisi_dma_update_bit(addr,
HISI_DMA_HIP09_PORT_CFG_LINK_DOWN_MASK_B, 1);
}
}
}
static void hisi_dma_init_dma_dev(struct hisi_dma_dev *hdma_dev)
{
struct dma_device *dma_dev;
dma_dev = &hdma_dev->dma_dev;
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
dma_dev->device_free_chan_resources = hisi_dma_free_chan_resources;
dma_dev->device_prep_dma_memcpy = hisi_dma_prep_dma_memcpy;
dma_dev->device_tx_status = hisi_dma_tx_status;
dma_dev->device_issue_pending = hisi_dma_issue_pending;
dma_dev->device_terminate_all = hisi_dma_terminate_all;
dma_dev->device_synchronize = hisi_dma_synchronize;
dma_dev->directions = BIT(DMA_MEM_TO_MEM);
dma_dev->dev = &hdma_dev->pdev->dev;
INIT_LIST_HEAD(&dma_dev->channels);
}
/* --- debugfs implementation --- */
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
static struct debugfs_reg32 *hisi_dma_get_ch_regs(struct hisi_dma_dev *hdma_dev,
u32 *regs_sz)
{
struct device *dev = &hdma_dev->pdev->dev;
struct debugfs_reg32 *regs;
u32 regs_sz_comm;
regs_sz_comm = ARRAY_SIZE(hisi_dma_comm_chan_regs);
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08)
*regs_sz = regs_sz_comm + ARRAY_SIZE(hisi_dma_hip08_chan_regs);
else
*regs_sz = regs_sz_comm + ARRAY_SIZE(hisi_dma_hip09_chan_regs);
regs = devm_kcalloc(dev, *regs_sz, sizeof(struct debugfs_reg32),
GFP_KERNEL);
if (!regs)
return NULL;
memcpy(regs, hisi_dma_comm_chan_regs, sizeof(hisi_dma_comm_chan_regs));
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08)
memcpy(regs + regs_sz_comm, hisi_dma_hip08_chan_regs,
sizeof(hisi_dma_hip08_chan_regs));
else
memcpy(regs + regs_sz_comm, hisi_dma_hip09_chan_regs,
sizeof(hisi_dma_hip09_chan_regs));
return regs;
}
static int hisi_dma_create_chan_dir(struct hisi_dma_dev *hdma_dev)
{
char dir_name[HISI_DMA_MAX_DIR_NAME_LEN];
struct debugfs_regset32 *regsets;
struct debugfs_reg32 *regs;
struct dentry *chan_dir;
struct device *dev;
u32 regs_sz;
int ret;
int i;
dev = &hdma_dev->pdev->dev;
regsets = devm_kcalloc(dev, hdma_dev->chan_num,
sizeof(*regsets), GFP_KERNEL);
if (!regsets)
return -ENOMEM;
regs = hisi_dma_get_ch_regs(hdma_dev, ®s_sz);
if (!regs)
return -ENOMEM;
for (i = 0; i < hdma_dev->chan_num; i++) {
regsets[i].regs = regs;
regsets[i].nregs = regs_sz;
regsets[i].base = hdma_dev->queue_base + i * HISI_DMA_Q_OFFSET;
regsets[i].dev = dev;
memset(dir_name, 0, HISI_DMA_MAX_DIR_NAME_LEN);
ret = sprintf(dir_name, "channel%d", i);
if (ret < 0)
return ret;
chan_dir = debugfs_create_dir(dir_name,
hdma_dev->dma_dev.dbg_dev_root);
debugfs_create_regset32("regs", 0444, chan_dir, ®sets[i]);
}
return 0;
}
static void hisi_dma_create_debugfs(struct hisi_dma_dev *hdma_dev)
{
struct debugfs_regset32 *regset;
struct device *dev;
int ret;
dev = &hdma_dev->pdev->dev;
if (hdma_dev->dma_dev.dbg_dev_root == NULL)
return;
regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
if (!regset)
return;
if (hdma_dev->reg_layout == HISI_DMA_REG_LAYOUT_HIP08) {
regset->regs = hisi_dma_hip08_comm_regs;
regset->nregs = ARRAY_SIZE(hisi_dma_hip08_comm_regs);
} else {
regset->regs = hisi_dma_hip09_comm_regs;
regset->nregs = ARRAY_SIZE(hisi_dma_hip09_comm_regs);
}
regset->base = hdma_dev->base;
regset->dev = dev;
debugfs_create_regset32("regs", 0444,
hdma_dev->dma_dev.dbg_dev_root, regset);
ret = hisi_dma_create_chan_dir(hdma_dev);
if (ret < 0)
dev_info(&hdma_dev->pdev->dev, "fail to create debugfs for channels!\n");
}
#else
static void hisi_dma_create_debugfs(struct hisi_dma_dev *hdma_dev) { }
#endif /* CONFIG_DEBUG_FS*/
/* --- debugfs implementation --- */
static int hisi_dma_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
enum hisi_dma_reg_layout reg_layout;
struct device *dev = &pdev->dev;
struct hisi_dma_dev *hdma_dev;
struct dma_device *dma_dev;
u32 chan_num;
u32 msi_num;
int ret;
reg_layout = hisi_dma_get_reg_layout(pdev);
if (reg_layout == HISI_DMA_REG_LAYOUT_INVALID) {
dev_err(dev, "unsupported device!\n");
return -EINVAL;
}
ret = pcim_enable_device(pdev);
if (ret) {
dev_err(dev, "failed to enable device mem!\n");
return ret;
}
ret = pcim_iomap_regions(pdev, 1 << PCI_BAR_2, pci_name(pdev));
if (ret) {
dev_err(dev, "failed to remap I/O region!\n");
return ret;
}
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (ret)
return ret;
chan_num = hisi_dma_get_chan_num(pdev);
hdma_dev = devm_kzalloc(dev, struct_size(hdma_dev, chan, chan_num),
GFP_KERNEL);
if (!hdma_dev)
return -EINVAL;
hdma_dev->base = pcim_iomap_table(pdev)[PCI_BAR_2];
hdma_dev->pdev = pdev;
hdma_dev->chan_depth = HISI_DMA_Q_DEPTH_VAL;
hdma_dev->chan_num = chan_num;
hdma_dev->reg_layout = reg_layout;
hdma_dev->queue_base = hdma_dev->base + hisi_dma_get_queue_base(pdev);
pci_set_drvdata(pdev, hdma_dev);
pci_set_master(pdev);
msi_num = hisi_dma_get_msi_num(pdev);
/* This will be freed by 'pcim_release()'. See 'pcim_enable_device()' */
ret = pci_alloc_irq_vectors(pdev, msi_num, msi_num, PCI_IRQ_MSI);
if (ret < 0) {
dev_err(dev, "Failed to allocate MSI vectors!\n");
return ret;
}
hisi_dma_init_dma_dev(hdma_dev);
hisi_dma_set_mode(hdma_dev, RC);
hisi_dma_init_hw(hdma_dev);
ret = hisi_dma_enable_hw_channels(hdma_dev);
if (ret < 0) {
dev_err(dev, "failed to enable hw channel!\n");
return ret;
}
ret = devm_add_action_or_reset(dev, hisi_dma_disable_hw_channels,
hdma_dev);
if (ret)
return ret;
dma_dev = &hdma_dev->dma_dev;
ret = dmaenginem_async_device_register(dma_dev);
if (ret < 0) {
dev_err(dev, "failed to register device!\n");
return ret;
}
hisi_dma_create_debugfs(hdma_dev);
return 0;
}
static const struct pci_device_id hisi_dma_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_HUAWEI, 0xa122) },
{ 0, }
};
static struct pci_driver hisi_dma_pci_driver = {
.name = "hisi_dma",
.id_table = hisi_dma_pci_tbl,
.probe = hisi_dma_probe,
};
module_pci_driver(hisi_dma_pci_driver);
MODULE_AUTHOR("Zhou Wang <[email protected]>");
MODULE_AUTHOR("Zhenfa Qiu <[email protected]>");
MODULE_DESCRIPTION("HiSilicon Kunpeng DMA controller driver");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(pci, hisi_dma_pci_tbl);
| linux-master | drivers/dma/hisi_dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2012 Marvell International Ltd.
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/dmaengine.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/platform_data/mmp_dma.h>
#include <linux/dmapool.h>
#include <linux/of_device.h>
#include <linux/of_dma.h>
#include <linux/of.h>
#include "dmaengine.h"
#define DCSR 0x0000
#define DALGN 0x00a0
#define DINT 0x00f0
#define DDADR 0x0200
#define DSADR(n) (0x0204 + ((n) << 4))
#define DTADR(n) (0x0208 + ((n) << 4))
#define DCMD 0x020c
#define DCSR_RUN BIT(31) /* Run Bit (read / write) */
#define DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */
#define DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (read / write) */
#define DCSR_REQPEND BIT(8) /* Request Pending (read-only) */
#define DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */
#define DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */
#define DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */
#define DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */
#define DCSR_EORIRQEN BIT(28) /* End of Receive Interrupt Enable (R/W) */
#define DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */
#define DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */
#define DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */
#define DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */
#define DCSR_CMPST BIT(10) /* The Descriptor Compare Status */
#define DCSR_EORINTR BIT(9) /* The end of Receive */
#define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + (((n) & 0x3f) << 2))
#define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */
#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
#define DDADR_STOP BIT(0) /* Stop (read / write) */
#define DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */
#define DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */
#define DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */
#define DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */
#define DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */
#define DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */
#define DCMD_ENDIAN BIT(18) /* Device Endian-ness. */
#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */
#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
#define PDMA_MAX_DESC_BYTES DCMD_LENGTH
struct mmp_pdma_desc_hw {
u32 ddadr; /* Points to the next descriptor + flags */
u32 dsadr; /* DSADR value for the current transfer */
u32 dtadr; /* DTADR value for the current transfer */
u32 dcmd; /* DCMD value for the current transfer */
} __aligned(32);
struct mmp_pdma_desc_sw {
struct mmp_pdma_desc_hw desc;
struct list_head node;
struct list_head tx_list;
struct dma_async_tx_descriptor async_tx;
};
struct mmp_pdma_phy;
struct mmp_pdma_chan {
struct device *dev;
struct dma_chan chan;
struct dma_async_tx_descriptor desc;
struct mmp_pdma_phy *phy;
enum dma_transfer_direction dir;
struct dma_slave_config slave_config;
struct mmp_pdma_desc_sw *cyclic_first; /* first desc_sw if channel
* is in cyclic mode */
/* channel's basic info */
struct tasklet_struct tasklet;
u32 dcmd;
u32 drcmr;
u32 dev_addr;
/* list for desc */
spinlock_t desc_lock; /* Descriptor list lock */
struct list_head chain_pending; /* Link descriptors queue for pending */
struct list_head chain_running; /* Link descriptors queue for running */
bool idle; /* channel statue machine */
bool byte_align;
struct dma_pool *desc_pool; /* Descriptors pool */
};
struct mmp_pdma_phy {
int idx;
void __iomem *base;
struct mmp_pdma_chan *vchan;
};
struct mmp_pdma_device {
int dma_channels;
void __iomem *base;
struct device *dev;
struct dma_device device;
struct mmp_pdma_phy *phy;
spinlock_t phy_lock; /* protect alloc/free phy channels */
};
#define tx_to_mmp_pdma_desc(tx) \
container_of(tx, struct mmp_pdma_desc_sw, async_tx)
#define to_mmp_pdma_desc(lh) \
container_of(lh, struct mmp_pdma_desc_sw, node)
#define to_mmp_pdma_chan(dchan) \
container_of(dchan, struct mmp_pdma_chan, chan)
#define to_mmp_pdma_dev(dmadev) \
container_of(dmadev, struct mmp_pdma_device, device)
static int mmp_pdma_config_write(struct dma_chan *dchan,
struct dma_slave_config *cfg,
enum dma_transfer_direction direction);
static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr)
{
u32 reg = (phy->idx << 4) + DDADR;
writel(addr, phy->base + reg);
}
static void enable_chan(struct mmp_pdma_phy *phy)
{
u32 reg, dalgn;
if (!phy->vchan)
return;
reg = DRCMR(phy->vchan->drcmr);
writel(DRCMR_MAPVLD | phy->idx, phy->base + reg);
dalgn = readl(phy->base + DALGN);
if (phy->vchan->byte_align)
dalgn |= 1 << phy->idx;
else
dalgn &= ~(1 << phy->idx);
writel(dalgn, phy->base + DALGN);
reg = (phy->idx << 2) + DCSR;
writel(readl(phy->base + reg) | DCSR_RUN, phy->base + reg);
}
static void disable_chan(struct mmp_pdma_phy *phy)
{
u32 reg;
if (!phy)
return;
reg = (phy->idx << 2) + DCSR;
writel(readl(phy->base + reg) & ~DCSR_RUN, phy->base + reg);
}
static int clear_chan_irq(struct mmp_pdma_phy *phy)
{
u32 dcsr;
u32 dint = readl(phy->base + DINT);
u32 reg = (phy->idx << 2) + DCSR;
if (!(dint & BIT(phy->idx)))
return -EAGAIN;
/* clear irq */
dcsr = readl(phy->base + reg);
writel(dcsr, phy->base + reg);
if ((dcsr & DCSR_BUSERR) && (phy->vchan))
dev_warn(phy->vchan->dev, "DCSR_BUSERR\n");
return 0;
}
static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id)
{
struct mmp_pdma_phy *phy = dev_id;
if (clear_chan_irq(phy) != 0)
return IRQ_NONE;
tasklet_schedule(&phy->vchan->tasklet);
return IRQ_HANDLED;
}
static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id)
{
struct mmp_pdma_device *pdev = dev_id;
struct mmp_pdma_phy *phy;
u32 dint = readl(pdev->base + DINT);
int i, ret;
int irq_num = 0;
while (dint) {
i = __ffs(dint);
/* only handle interrupts belonging to pdma driver*/
if (i >= pdev->dma_channels)
break;
dint &= (dint - 1);
phy = &pdev->phy[i];
ret = mmp_pdma_chan_handler(irq, phy);
if (ret == IRQ_HANDLED)
irq_num++;
}
if (irq_num)
return IRQ_HANDLED;
return IRQ_NONE;
}
/* lookup free phy channel as descending priority */
static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan *pchan)
{
int prio, i;
struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
struct mmp_pdma_phy *phy, *found = NULL;
unsigned long flags;
/*
* dma channel priorities
* ch 0 - 3, 16 - 19 <--> (0)
* ch 4 - 7, 20 - 23 <--> (1)
* ch 8 - 11, 24 - 27 <--> (2)
* ch 12 - 15, 28 - 31 <--> (3)
*/
spin_lock_irqsave(&pdev->phy_lock, flags);
for (prio = 0; prio <= ((pdev->dma_channels - 1) & 0xf) >> 2; prio++) {
for (i = 0; i < pdev->dma_channels; i++) {
if (prio != (i & 0xf) >> 2)
continue;
phy = &pdev->phy[i];
if (!phy->vchan) {
phy->vchan = pchan;
found = phy;
goto out_unlock;
}
}
}
out_unlock:
spin_unlock_irqrestore(&pdev->phy_lock, flags);
return found;
}
static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan)
{
struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device);
unsigned long flags;
u32 reg;
if (!pchan->phy)
return;
/* clear the channel mapping in DRCMR */
reg = DRCMR(pchan->drcmr);
writel(0, pchan->phy->base + reg);
spin_lock_irqsave(&pdev->phy_lock, flags);
pchan->phy->vchan = NULL;
pchan->phy = NULL;
spin_unlock_irqrestore(&pdev->phy_lock, flags);
}
/*
* start_pending_queue - transfer any pending transactions
* pending list ==> running list
*/
static void start_pending_queue(struct mmp_pdma_chan *chan)
{
struct mmp_pdma_desc_sw *desc;
/* still in running, irq will start the pending list */
if (!chan->idle) {
dev_dbg(chan->dev, "DMA controller still busy\n");
return;
}
if (list_empty(&chan->chain_pending)) {
/* chance to re-fetch phy channel with higher prio */
mmp_pdma_free_phy(chan);
dev_dbg(chan->dev, "no pending list\n");
return;
}
if (!chan->phy) {
chan->phy = lookup_phy(chan);
if (!chan->phy) {
dev_dbg(chan->dev, "no free dma channel\n");
return;
}
}
/*
* pending -> running
* reintilize pending list
*/
desc = list_first_entry(&chan->chain_pending,
struct mmp_pdma_desc_sw, node);
list_splice_tail_init(&chan->chain_pending, &chan->chain_running);
/*
* Program the descriptor's address into the DMA controller,
* then start the DMA transaction
*/
set_desc(chan->phy, desc->async_tx.phys);
enable_chan(chan->phy);
chan->idle = false;
}
/* desc->tx_list ==> pending list */
static dma_cookie_t mmp_pdma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(tx->chan);
struct mmp_pdma_desc_sw *desc = tx_to_mmp_pdma_desc(tx);
struct mmp_pdma_desc_sw *child;
unsigned long flags;
dma_cookie_t cookie = -EBUSY;
spin_lock_irqsave(&chan->desc_lock, flags);
list_for_each_entry(child, &desc->tx_list, node) {
cookie = dma_cookie_assign(&child->async_tx);
}
/* softly link to pending list - desc->tx_list ==> pending list */
list_splice_tail_init(&desc->tx_list, &chan->chain_pending);
spin_unlock_irqrestore(&chan->desc_lock, flags);
return cookie;
}
static struct mmp_pdma_desc_sw *
mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan)
{
struct mmp_pdma_desc_sw *desc;
dma_addr_t pdesc;
desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
if (!desc) {
dev_err(chan->dev, "out of memory for link descriptor\n");
return NULL;
}
INIT_LIST_HEAD(&desc->tx_list);
dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan);
/* each desc has submit */
desc->async_tx.tx_submit = mmp_pdma_tx_submit;
desc->async_tx.phys = pdesc;
return desc;
}
/*
* mmp_pdma_alloc_chan_resources - Allocate resources for DMA channel.
*
* This function will create a dma pool for descriptor allocation.
* Request irq only when channel is requested
* Return - The number of allocated descriptors.
*/
static int mmp_pdma_alloc_chan_resources(struct dma_chan *dchan)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
if (chan->desc_pool)
return 1;
chan->desc_pool = dma_pool_create(dev_name(&dchan->dev->device),
chan->dev,
sizeof(struct mmp_pdma_desc_sw),
__alignof__(struct mmp_pdma_desc_sw),
0);
if (!chan->desc_pool) {
dev_err(chan->dev, "unable to allocate descriptor pool\n");
return -ENOMEM;
}
mmp_pdma_free_phy(chan);
chan->idle = true;
chan->dev_addr = 0;
return 1;
}
static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan,
struct list_head *list)
{
struct mmp_pdma_desc_sw *desc, *_desc;
list_for_each_entry_safe(desc, _desc, list, node) {
list_del(&desc->node);
dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
}
}
static void mmp_pdma_free_chan_resources(struct dma_chan *dchan)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
unsigned long flags;
spin_lock_irqsave(&chan->desc_lock, flags);
mmp_pdma_free_desc_list(chan, &chan->chain_pending);
mmp_pdma_free_desc_list(chan, &chan->chain_running);
spin_unlock_irqrestore(&chan->desc_lock, flags);
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
chan->idle = true;
chan->dev_addr = 0;
mmp_pdma_free_phy(chan);
return;
}
static struct dma_async_tx_descriptor *
mmp_pdma_prep_memcpy(struct dma_chan *dchan,
dma_addr_t dma_dst, dma_addr_t dma_src,
size_t len, unsigned long flags)
{
struct mmp_pdma_chan *chan;
struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
size_t copy = 0;
if (!dchan)
return NULL;
if (!len)
return NULL;
chan = to_mmp_pdma_chan(dchan);
chan->byte_align = false;
if (!chan->dir) {
chan->dir = DMA_MEM_TO_MEM;
chan->dcmd = DCMD_INCTRGADDR | DCMD_INCSRCADDR;
chan->dcmd |= DCMD_BURST32;
}
do {
/* Allocate the link descriptor from DMA pool */
new = mmp_pdma_alloc_descriptor(chan);
if (!new) {
dev_err(chan->dev, "no memory for desc\n");
goto fail;
}
copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES);
if (dma_src & 0x7 || dma_dst & 0x7)
chan->byte_align = true;
new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy);
new->desc.dsadr = dma_src;
new->desc.dtadr = dma_dst;
if (!first)
first = new;
else
prev->desc.ddadr = new->async_tx.phys;
new->async_tx.cookie = 0;
async_tx_ack(&new->async_tx);
prev = new;
len -= copy;
if (chan->dir == DMA_MEM_TO_DEV) {
dma_src += copy;
} else if (chan->dir == DMA_DEV_TO_MEM) {
dma_dst += copy;
} else if (chan->dir == DMA_MEM_TO_MEM) {
dma_src += copy;
dma_dst += copy;
}
/* Insert the link descriptor to the LD ring */
list_add_tail(&new->node, &first->tx_list);
} while (len);
first->async_tx.flags = flags; /* client is in control of this ack */
first->async_tx.cookie = -EBUSY;
/* last desc and fire IRQ */
new->desc.ddadr = DDADR_STOP;
new->desc.dcmd |= DCMD_ENDIRQEN;
chan->cyclic_first = NULL;
return &first->async_tx;
fail:
if (first)
mmp_pdma_free_desc_list(chan, &first->tx_list);
return NULL;
}
static struct dma_async_tx_descriptor *
mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
size_t len, avail;
struct scatterlist *sg;
dma_addr_t addr;
int i;
if ((sgl == NULL) || (sg_len == 0))
return NULL;
chan->byte_align = false;
mmp_pdma_config_write(dchan, &chan->slave_config, dir);
for_each_sg(sgl, sg, sg_len, i) {
addr = sg_dma_address(sg);
avail = sg_dma_len(sgl);
do {
len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES);
if (addr & 0x7)
chan->byte_align = true;
/* allocate and populate the descriptor */
new = mmp_pdma_alloc_descriptor(chan);
if (!new) {
dev_err(chan->dev, "no memory for desc\n");
goto fail;
}
new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len);
if (dir == DMA_MEM_TO_DEV) {
new->desc.dsadr = addr;
new->desc.dtadr = chan->dev_addr;
} else {
new->desc.dsadr = chan->dev_addr;
new->desc.dtadr = addr;
}
if (!first)
first = new;
else
prev->desc.ddadr = new->async_tx.phys;
new->async_tx.cookie = 0;
async_tx_ack(&new->async_tx);
prev = new;
/* Insert the link descriptor to the LD ring */
list_add_tail(&new->node, &first->tx_list);
/* update metadata */
addr += len;
avail -= len;
} while (avail);
}
first->async_tx.cookie = -EBUSY;
first->async_tx.flags = flags;
/* last desc and fire IRQ */
new->desc.ddadr = DDADR_STOP;
new->desc.dcmd |= DCMD_ENDIRQEN;
chan->dir = dir;
chan->cyclic_first = NULL;
return &first->async_tx;
fail:
if (first)
mmp_pdma_free_desc_list(chan, &first->tx_list);
return NULL;
}
static struct dma_async_tx_descriptor *
mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
dma_addr_t buf_addr, size_t len, size_t period_len,
enum dma_transfer_direction direction,
unsigned long flags)
{
struct mmp_pdma_chan *chan;
struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
dma_addr_t dma_src, dma_dst;
if (!dchan || !len || !period_len)
return NULL;
/* the buffer length must be a multiple of period_len */
if (len % period_len != 0)
return NULL;
if (period_len > PDMA_MAX_DESC_BYTES)
return NULL;
chan = to_mmp_pdma_chan(dchan);
mmp_pdma_config_write(dchan, &chan->slave_config, direction);
switch (direction) {
case DMA_MEM_TO_DEV:
dma_src = buf_addr;
dma_dst = chan->dev_addr;
break;
case DMA_DEV_TO_MEM:
dma_dst = buf_addr;
dma_src = chan->dev_addr;
break;
default:
dev_err(chan->dev, "Unsupported direction for cyclic DMA\n");
return NULL;
}
chan->dir = direction;
do {
/* Allocate the link descriptor from DMA pool */
new = mmp_pdma_alloc_descriptor(chan);
if (!new) {
dev_err(chan->dev, "no memory for desc\n");
goto fail;
}
new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
(DCMD_LENGTH & period_len));
new->desc.dsadr = dma_src;
new->desc.dtadr = dma_dst;
if (!first)
first = new;
else
prev->desc.ddadr = new->async_tx.phys;
new->async_tx.cookie = 0;
async_tx_ack(&new->async_tx);
prev = new;
len -= period_len;
if (chan->dir == DMA_MEM_TO_DEV)
dma_src += period_len;
else
dma_dst += period_len;
/* Insert the link descriptor to the LD ring */
list_add_tail(&new->node, &first->tx_list);
} while (len);
first->async_tx.flags = flags; /* client is in control of this ack */
first->async_tx.cookie = -EBUSY;
/* make the cyclic link */
new->desc.ddadr = first->async_tx.phys;
chan->cyclic_first = first;
return &first->async_tx;
fail:
if (first)
mmp_pdma_free_desc_list(chan, &first->tx_list);
return NULL;
}
static int mmp_pdma_config_write(struct dma_chan *dchan,
struct dma_slave_config *cfg,
enum dma_transfer_direction direction)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
u32 maxburst = 0, addr = 0;
enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
if (!dchan)
return -EINVAL;
if (direction == DMA_DEV_TO_MEM) {
chan->dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC;
maxburst = cfg->src_maxburst;
width = cfg->src_addr_width;
addr = cfg->src_addr;
} else if (direction == DMA_MEM_TO_DEV) {
chan->dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
maxburst = cfg->dst_maxburst;
width = cfg->dst_addr_width;
addr = cfg->dst_addr;
}
if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
chan->dcmd |= DCMD_WIDTH1;
else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
chan->dcmd |= DCMD_WIDTH2;
else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES)
chan->dcmd |= DCMD_WIDTH4;
if (maxburst == 8)
chan->dcmd |= DCMD_BURST8;
else if (maxburst == 16)
chan->dcmd |= DCMD_BURST16;
else if (maxburst == 32)
chan->dcmd |= DCMD_BURST32;
chan->dir = direction;
chan->dev_addr = addr;
return 0;
}
static int mmp_pdma_config(struct dma_chan *dchan,
struct dma_slave_config *cfg)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
memcpy(&chan->slave_config, cfg, sizeof(*cfg));
return 0;
}
static int mmp_pdma_terminate_all(struct dma_chan *dchan)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
unsigned long flags;
if (!dchan)
return -EINVAL;
disable_chan(chan->phy);
mmp_pdma_free_phy(chan);
spin_lock_irqsave(&chan->desc_lock, flags);
mmp_pdma_free_desc_list(chan, &chan->chain_pending);
mmp_pdma_free_desc_list(chan, &chan->chain_running);
spin_unlock_irqrestore(&chan->desc_lock, flags);
chan->idle = true;
return 0;
}
static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan,
dma_cookie_t cookie)
{
struct mmp_pdma_desc_sw *sw;
u32 curr, residue = 0;
bool passed = false;
bool cyclic = chan->cyclic_first != NULL;
/*
* If the channel does not have a phy pointer anymore, it has already
* been completed. Therefore, its residue is 0.
*/
if (!chan->phy)
return 0;
if (chan->dir == DMA_DEV_TO_MEM)
curr = readl(chan->phy->base + DTADR(chan->phy->idx));
else
curr = readl(chan->phy->base + DSADR(chan->phy->idx));
list_for_each_entry(sw, &chan->chain_running, node) {
u32 start, end, len;
if (chan->dir == DMA_DEV_TO_MEM)
start = sw->desc.dtadr;
else
start = sw->desc.dsadr;
len = sw->desc.dcmd & DCMD_LENGTH;
end = start + len;
/*
* 'passed' will be latched once we found the descriptor which
* lies inside the boundaries of the curr pointer. All
* descriptors that occur in the list _after_ we found that
* partially handled descriptor are still to be processed and
* are hence added to the residual bytes counter.
*/
if (passed) {
residue += len;
} else if (curr >= start && curr <= end) {
residue += end - curr;
passed = true;
}
/*
* Descriptors that have the ENDIRQEN bit set mark the end of a
* transaction chain, and the cookie assigned with it has been
* returned previously from mmp_pdma_tx_submit().
*
* In case we have multiple transactions in the running chain,
* and the cookie does not match the one the user asked us
* about, reset the state variables and start over.
*
* This logic does not apply to cyclic transactions, where all
* descriptors have the ENDIRQEN bit set, and for which we
* can't have multiple transactions on one channel anyway.
*/
if (cyclic || !(sw->desc.dcmd & DCMD_ENDIRQEN))
continue;
if (sw->async_tx.cookie == cookie) {
return residue;
} else {
residue = 0;
passed = false;
}
}
/* We should only get here in case of cyclic transactions */
return residue;
}
static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
enum dma_status ret;
ret = dma_cookie_status(dchan, cookie, txstate);
if (likely(ret != DMA_ERROR))
dma_set_residue(txstate, mmp_pdma_residue(chan, cookie));
return ret;
}
/*
* mmp_pdma_issue_pending - Issue the DMA start command
* pending list ==> running list
*/
static void mmp_pdma_issue_pending(struct dma_chan *dchan)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
unsigned long flags;
spin_lock_irqsave(&chan->desc_lock, flags);
start_pending_queue(chan);
spin_unlock_irqrestore(&chan->desc_lock, flags);
}
/*
* dma_do_tasklet
* Do call back
* Start pending list
*/
static void dma_do_tasklet(struct tasklet_struct *t)
{
struct mmp_pdma_chan *chan = from_tasklet(chan, t, tasklet);
struct mmp_pdma_desc_sw *desc, *_desc;
LIST_HEAD(chain_cleanup);
unsigned long flags;
struct dmaengine_desc_callback cb;
if (chan->cyclic_first) {
spin_lock_irqsave(&chan->desc_lock, flags);
desc = chan->cyclic_first;
dmaengine_desc_get_callback(&desc->async_tx, &cb);
spin_unlock_irqrestore(&chan->desc_lock, flags);
dmaengine_desc_callback_invoke(&cb, NULL);
return;
}
/* submit pending list; callback for each desc; free desc */
spin_lock_irqsave(&chan->desc_lock, flags);
list_for_each_entry_safe(desc, _desc, &chan->chain_running, node) {
/*
* move the descriptors to a temporary list so we can drop
* the lock during the entire cleanup operation
*/
list_move(&desc->node, &chain_cleanup);
/*
* Look for the first list entry which has the ENDIRQEN flag
* set. That is the descriptor we got an interrupt for, so
* complete that transaction and its cookie.
*/
if (desc->desc.dcmd & DCMD_ENDIRQEN) {
dma_cookie_t cookie = desc->async_tx.cookie;
dma_cookie_complete(&desc->async_tx);
dev_dbg(chan->dev, "completed_cookie=%d\n", cookie);
break;
}
}
/*
* The hardware is idle and ready for more when the
* chain_running list is empty.
*/
chan->idle = list_empty(&chan->chain_running);
/* Start any pending transactions automatically */
start_pending_queue(chan);
spin_unlock_irqrestore(&chan->desc_lock, flags);
/* Run the callback for each descriptor, in order */
list_for_each_entry_safe(desc, _desc, &chain_cleanup, node) {
struct dma_async_tx_descriptor *txd = &desc->async_tx;
/* Remove from the list of transactions */
list_del(&desc->node);
/* Run the link descriptor callback function */
dmaengine_desc_get_callback(txd, &cb);
dmaengine_desc_callback_invoke(&cb, NULL);
dma_pool_free(chan->desc_pool, desc, txd->phys);
}
}
static int mmp_pdma_remove(struct platform_device *op)
{
struct mmp_pdma_device *pdev = platform_get_drvdata(op);
struct mmp_pdma_phy *phy;
int i, irq = 0, irq_num = 0;
if (op->dev.of_node)
of_dma_controller_free(op->dev.of_node);
for (i = 0; i < pdev->dma_channels; i++) {
if (platform_get_irq(op, i) > 0)
irq_num++;
}
if (irq_num != pdev->dma_channels) {
irq = platform_get_irq(op, 0);
devm_free_irq(&op->dev, irq, pdev);
} else {
for (i = 0; i < pdev->dma_channels; i++) {
phy = &pdev->phy[i];
irq = platform_get_irq(op, i);
devm_free_irq(&op->dev, irq, phy);
}
}
dma_async_device_unregister(&pdev->device);
return 0;
}
static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
{
struct mmp_pdma_phy *phy = &pdev->phy[idx];
struct mmp_pdma_chan *chan;
int ret;
chan = devm_kzalloc(pdev->dev, sizeof(*chan), GFP_KERNEL);
if (chan == NULL)
return -ENOMEM;
phy->idx = idx;
phy->base = pdev->base;
if (irq) {
ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler,
IRQF_SHARED, "pdma", phy);
if (ret) {
dev_err(pdev->dev, "channel request irq fail!\n");
return ret;
}
}
spin_lock_init(&chan->desc_lock);
chan->dev = pdev->dev;
chan->chan.device = &pdev->device;
tasklet_setup(&chan->tasklet, dma_do_tasklet);
INIT_LIST_HEAD(&chan->chain_pending);
INIT_LIST_HEAD(&chan->chain_running);
/* register virt channel to dma engine */
list_add_tail(&chan->chan.device_node, &pdev->device.channels);
return 0;
}
static const struct of_device_id mmp_pdma_dt_ids[] = {
{ .compatible = "marvell,pdma-1.0", },
{}
};
MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids);
static struct dma_chan *mmp_pdma_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct mmp_pdma_device *d = ofdma->of_dma_data;
struct dma_chan *chan;
chan = dma_get_any_slave_channel(&d->device);
if (!chan)
return NULL;
to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0];
return chan;
}
static int mmp_pdma_probe(struct platform_device *op)
{
struct mmp_pdma_device *pdev;
const struct of_device_id *of_id;
struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
int i, ret, irq = 0;
int dma_channels = 0, irq_num = 0;
const enum dma_slave_buswidth widths =
DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
DMA_SLAVE_BUSWIDTH_4_BYTES;
pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
if (!pdev)
return -ENOMEM;
pdev->dev = &op->dev;
spin_lock_init(&pdev->phy_lock);
pdev->base = devm_platform_ioremap_resource(op, 0);
if (IS_ERR(pdev->base))
return PTR_ERR(pdev->base);
of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev);
if (of_id) {
/* Parse new and deprecated dma-channels properties */
if (of_property_read_u32(pdev->dev->of_node, "dma-channels",
&dma_channels))
of_property_read_u32(pdev->dev->of_node, "#dma-channels",
&dma_channels);
} else if (pdata && pdata->dma_channels) {
dma_channels = pdata->dma_channels;
} else {
dma_channels = 32; /* default 32 channel */
}
pdev->dma_channels = dma_channels;
for (i = 0; i < dma_channels; i++) {
if (platform_get_irq_optional(op, i) > 0)
irq_num++;
}
pdev->phy = devm_kcalloc(pdev->dev, dma_channels, sizeof(*pdev->phy),
GFP_KERNEL);
if (pdev->phy == NULL)
return -ENOMEM;
INIT_LIST_HEAD(&pdev->device.channels);
if (irq_num != dma_channels) {
/* all chan share one irq, demux inside */
irq = platform_get_irq(op, 0);
ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler,
IRQF_SHARED, "pdma", pdev);
if (ret)
return ret;
}
for (i = 0; i < dma_channels; i++) {
irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i);
ret = mmp_pdma_chan_init(pdev, i, irq);
if (ret)
return ret;
}
dma_cap_set(DMA_SLAVE, pdev->device.cap_mask);
dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask);
dma_cap_set(DMA_CYCLIC, pdev->device.cap_mask);
dma_cap_set(DMA_PRIVATE, pdev->device.cap_mask);
pdev->device.dev = &op->dev;
pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources;
pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources;
pdev->device.device_tx_status = mmp_pdma_tx_status;
pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy;
pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg;
pdev->device.device_prep_dma_cyclic = mmp_pdma_prep_dma_cyclic;
pdev->device.device_issue_pending = mmp_pdma_issue_pending;
pdev->device.device_config = mmp_pdma_config;
pdev->device.device_terminate_all = mmp_pdma_terminate_all;
pdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
pdev->device.src_addr_widths = widths;
pdev->device.dst_addr_widths = widths;
pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
pdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
if (pdev->dev->coherent_dma_mask)
dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask);
else
dma_set_mask(pdev->dev, DMA_BIT_MASK(64));
ret = dma_async_device_register(&pdev->device);
if (ret) {
dev_err(pdev->device.dev, "unable to register\n");
return ret;
}
if (op->dev.of_node) {
/* Device-tree DMA controller registration */
ret = of_dma_controller_register(op->dev.of_node,
mmp_pdma_dma_xlate, pdev);
if (ret < 0) {
dev_err(&op->dev, "of_dma_controller_register failed\n");
dma_async_device_unregister(&pdev->device);
return ret;
}
}
platform_set_drvdata(op, pdev);
dev_info(pdev->device.dev, "initialized %d channels\n", dma_channels);
return 0;
}
static const struct platform_device_id mmp_pdma_id_table[] = {
{ "mmp-pdma", },
{ },
};
static struct platform_driver mmp_pdma_driver = {
.driver = {
.name = "mmp-pdma",
.of_match_table = mmp_pdma_dt_ids,
},
.id_table = mmp_pdma_id_table,
.probe = mmp_pdma_probe,
.remove = mmp_pdma_remove,
};
module_platform_driver(mmp_pdma_driver);
MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
MODULE_AUTHOR("Marvell International Ltd.");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/mmp_pdma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* DMA driver for NVIDIA Tegra GPC DMA controller.
*
* Copyright (c) 2014-2022, NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/bitfield.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/iommu.h>
#include <linux/iopoll.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <dt-bindings/memory/tegra186-mc.h>
#include "virt-dma.h"
/* CSR register */
#define TEGRA_GPCDMA_CHAN_CSR 0x00
#define TEGRA_GPCDMA_CSR_ENB BIT(31)
#define TEGRA_GPCDMA_CSR_IE_EOC BIT(30)
#define TEGRA_GPCDMA_CSR_ONCE BIT(27)
#define TEGRA_GPCDMA_CSR_FC_MODE GENMASK(25, 24)
#define TEGRA_GPCDMA_CSR_FC_MODE_NO_MMIO \
FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 0)
#define TEGRA_GPCDMA_CSR_FC_MODE_ONE_MMIO \
FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 1)
#define TEGRA_GPCDMA_CSR_FC_MODE_TWO_MMIO \
FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 2)
#define TEGRA_GPCDMA_CSR_FC_MODE_FOUR_MMIO \
FIELD_PREP(TEGRA_GPCDMA_CSR_FC_MODE, 3)
#define TEGRA_GPCDMA_CSR_DMA GENMASK(23, 21)
#define TEGRA_GPCDMA_CSR_DMA_IO2MEM_NO_FC \
FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 0)
#define TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC \
FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 1)
#define TEGRA_GPCDMA_CSR_DMA_MEM2IO_NO_FC \
FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 2)
#define TEGRA_GPCDMA_CSR_DMA_MEM2IO_FC \
FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 3)
#define TEGRA_GPCDMA_CSR_DMA_MEM2MEM \
FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 4)
#define TEGRA_GPCDMA_CSR_DMA_FIXED_PAT \
FIELD_PREP(TEGRA_GPCDMA_CSR_DMA, 6)
#define TEGRA_GPCDMA_CSR_REQ_SEL_MASK GENMASK(20, 16)
#define TEGRA_GPCDMA_CSR_REQ_SEL_UNUSED \
FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, 4)
#define TEGRA_GPCDMA_CSR_IRQ_MASK BIT(15)
#define TEGRA_GPCDMA_CSR_WEIGHT GENMASK(13, 10)
/* STATUS register */
#define TEGRA_GPCDMA_CHAN_STATUS 0x004
#define TEGRA_GPCDMA_STATUS_BUSY BIT(31)
#define TEGRA_GPCDMA_STATUS_ISE_EOC BIT(30)
#define TEGRA_GPCDMA_STATUS_PING_PONG BIT(28)
#define TEGRA_GPCDMA_STATUS_DMA_ACTIVITY BIT(27)
#define TEGRA_GPCDMA_STATUS_CHANNEL_PAUSE BIT(26)
#define TEGRA_GPCDMA_STATUS_CHANNEL_RX BIT(25)
#define TEGRA_GPCDMA_STATUS_CHANNEL_TX BIT(24)
#define TEGRA_GPCDMA_STATUS_IRQ_INTR_STA BIT(23)
#define TEGRA_GPCDMA_STATUS_IRQ_STA BIT(21)
#define TEGRA_GPCDMA_STATUS_IRQ_TRIG_STA BIT(20)
#define TEGRA_GPCDMA_CHAN_CSRE 0x008
#define TEGRA_GPCDMA_CHAN_CSRE_PAUSE BIT(31)
/* Source address */
#define TEGRA_GPCDMA_CHAN_SRC_PTR 0x00C
/* Destination address */
#define TEGRA_GPCDMA_CHAN_DST_PTR 0x010
/* High address pointer */
#define TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR 0x014
#define TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR GENMASK(7, 0)
#define TEGRA_GPCDMA_HIGH_ADDR_DST_PTR GENMASK(23, 16)
/* MC sequence register */
#define TEGRA_GPCDMA_CHAN_MCSEQ 0x18
#define TEGRA_GPCDMA_MCSEQ_DATA_SWAP BIT(31)
#define TEGRA_GPCDMA_MCSEQ_REQ_COUNT GENMASK(30, 25)
#define TEGRA_GPCDMA_MCSEQ_BURST GENMASK(24, 23)
#define TEGRA_GPCDMA_MCSEQ_BURST_2 \
FIELD_PREP(TEGRA_GPCDMA_MCSEQ_BURST, 0)
#define TEGRA_GPCDMA_MCSEQ_BURST_16 \
FIELD_PREP(TEGRA_GPCDMA_MCSEQ_BURST, 3)
#define TEGRA_GPCDMA_MCSEQ_WRAP1 GENMASK(22, 20)
#define TEGRA_GPCDMA_MCSEQ_WRAP0 GENMASK(19, 17)
#define TEGRA_GPCDMA_MCSEQ_WRAP_NONE 0
#define TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK GENMASK(13, 7)
#define TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK GENMASK(6, 0)
/* MMIO sequence register */
#define TEGRA_GPCDMA_CHAN_MMIOSEQ 0x01c
#define TEGRA_GPCDMA_MMIOSEQ_DBL_BUF BIT(31)
#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH GENMASK(30, 28)
#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8 \
FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 0)
#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16 \
FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 1)
#define TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32 \
FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH, 2)
#define TEGRA_GPCDMA_MMIOSEQ_DATA_SWAP BIT(27)
#define TEGRA_GPCDMA_MMIOSEQ_BURST_SHIFT 23
#define TEGRA_GPCDMA_MMIOSEQ_BURST_MIN 2U
#define TEGRA_GPCDMA_MMIOSEQ_BURST_MAX 32U
#define TEGRA_GPCDMA_MMIOSEQ_BURST(bs) \
(GENMASK((fls(bs) - 2), 0) << TEGRA_GPCDMA_MMIOSEQ_BURST_SHIFT)
#define TEGRA_GPCDMA_MMIOSEQ_MASTER_ID GENMASK(22, 19)
#define TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD GENMASK(18, 16)
#define TEGRA_GPCDMA_MMIOSEQ_MMIO_PROT GENMASK(8, 7)
/* Channel WCOUNT */
#define TEGRA_GPCDMA_CHAN_WCOUNT 0x20
/* Transfer count */
#define TEGRA_GPCDMA_CHAN_XFER_COUNT 0x24
/* DMA byte count status */
#define TEGRA_GPCDMA_CHAN_DMA_BYTE_STATUS 0x28
/* Error Status Register */
#define TEGRA_GPCDMA_CHAN_ERR_STATUS 0x30
#define TEGRA_GPCDMA_CHAN_ERR_TYPE_SHIFT 8
#define TEGRA_GPCDMA_CHAN_ERR_TYPE_MASK 0xF
#define TEGRA_GPCDMA_CHAN_ERR_TYPE(err) ( \
((err) >> TEGRA_GPCDMA_CHAN_ERR_TYPE_SHIFT) & \
TEGRA_GPCDMA_CHAN_ERR_TYPE_MASK)
#define TEGRA_DMA_BM_FIFO_FULL_ERR 0xF
#define TEGRA_DMA_PERIPH_FIFO_FULL_ERR 0xE
#define TEGRA_DMA_PERIPH_ID_ERR 0xD
#define TEGRA_DMA_STREAM_ID_ERR 0xC
#define TEGRA_DMA_MC_SLAVE_ERR 0xB
#define TEGRA_DMA_MMIO_SLAVE_ERR 0xA
/* Fixed Pattern */
#define TEGRA_GPCDMA_CHAN_FIXED_PATTERN 0x34
#define TEGRA_GPCDMA_CHAN_TZ 0x38
#define TEGRA_GPCDMA_CHAN_TZ_MMIO_PROT_1 BIT(0)
#define TEGRA_GPCDMA_CHAN_TZ_MC_PROT_1 BIT(1)
#define TEGRA_GPCDMA_CHAN_SPARE 0x3c
#define TEGRA_GPCDMA_CHAN_SPARE_EN_LEGACY_FC BIT(16)
/*
* If any burst is in flight and DMA paused then this is the time to complete
* on-flight burst and update DMA status register.
*/
#define TEGRA_GPCDMA_BURST_COMPLETE_TIME 10
#define TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT 5000 /* 5 msec */
/* Channel base address offset from GPCDMA base address */
#define TEGRA_GPCDMA_CHANNEL_BASE_ADDR_OFFSET 0x10000
/* Default channel mask reserving channel0 */
#define TEGRA_GPCDMA_DEFAULT_CHANNEL_MASK 0xfffffffe
struct tegra_dma;
struct tegra_dma_channel;
/*
* tegra_dma_chip_data Tegra chip specific DMA data
* @nr_channels: Number of channels available in the controller.
* @channel_reg_size: Channel register size.
* @max_dma_count: Maximum DMA transfer count supported by DMA controller.
* @hw_support_pause: DMA HW engine support pause of the channel.
*/
struct tegra_dma_chip_data {
bool hw_support_pause;
unsigned int nr_channels;
unsigned int channel_reg_size;
unsigned int max_dma_count;
int (*terminate)(struct tegra_dma_channel *tdc);
};
/* DMA channel registers */
struct tegra_dma_channel_regs {
u32 csr;
u32 src_ptr;
u32 dst_ptr;
u32 high_addr_ptr;
u32 mc_seq;
u32 mmio_seq;
u32 wcount;
u32 fixed_pattern;
};
/*
* tegra_dma_sg_req: DMA request details to configure hardware. This
* contains the details for one transfer to configure DMA hw.
* The client's request for data transfer can be broken into multiple
* sub-transfer as per requester details and hw support. This sub transfer
* get added as an array in Tegra DMA desc which manages the transfer details.
*/
struct tegra_dma_sg_req {
unsigned int len;
struct tegra_dma_channel_regs ch_regs;
};
/*
* tegra_dma_desc: Tegra DMA descriptors which uses virt_dma_desc to
* manage client request and keep track of transfer status, callbacks
* and request counts etc.
*/
struct tegra_dma_desc {
bool cyclic;
unsigned int bytes_req;
unsigned int bytes_xfer;
unsigned int sg_idx;
unsigned int sg_count;
struct virt_dma_desc vd;
struct tegra_dma_channel *tdc;
struct tegra_dma_sg_req sg_req[];
};
/*
* tegra_dma_channel: Channel specific information
*/
struct tegra_dma_channel {
bool config_init;
char name[30];
enum dma_transfer_direction sid_dir;
int id;
int irq;
int slave_id;
struct tegra_dma *tdma;
struct virt_dma_chan vc;
struct tegra_dma_desc *dma_desc;
struct dma_slave_config dma_sconfig;
unsigned int stream_id;
unsigned long chan_base_offset;
};
/*
* tegra_dma: Tegra DMA specific information
*/
struct tegra_dma {
const struct tegra_dma_chip_data *chip_data;
unsigned long sid_m2d_reserved;
unsigned long sid_d2m_reserved;
u32 chan_mask;
void __iomem *base_addr;
struct device *dev;
struct dma_device dma_dev;
struct reset_control *rst;
struct tegra_dma_channel channels[];
};
static inline void tdc_write(struct tegra_dma_channel *tdc,
u32 reg, u32 val)
{
writel_relaxed(val, tdc->tdma->base_addr + tdc->chan_base_offset + reg);
}
static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
{
return readl_relaxed(tdc->tdma->base_addr + tdc->chan_base_offset + reg);
}
static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
{
return container_of(dc, struct tegra_dma_channel, vc.chan);
}
static inline struct tegra_dma_desc *vd_to_tegra_dma_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct tegra_dma_desc, vd);
}
static inline struct device *tdc2dev(struct tegra_dma_channel *tdc)
{
return tdc->vc.chan.device->dev;
}
static void tegra_dma_dump_chan_regs(struct tegra_dma_channel *tdc)
{
dev_dbg(tdc2dev(tdc), "DMA Channel %d name %s register dump:\n",
tdc->id, tdc->name);
dev_dbg(tdc2dev(tdc), "CSR %x STA %x CSRE %x SRC %x DST %x\n",
tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR),
tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS),
tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSRE),
tdc_read(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR),
tdc_read(tdc, TEGRA_GPCDMA_CHAN_DST_PTR)
);
dev_dbg(tdc2dev(tdc), "MCSEQ %x IOSEQ %x WCNT %x XFER %x BSTA %x\n",
tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ),
tdc_read(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ),
tdc_read(tdc, TEGRA_GPCDMA_CHAN_WCOUNT),
tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT),
tdc_read(tdc, TEGRA_GPCDMA_CHAN_DMA_BYTE_STATUS)
);
dev_dbg(tdc2dev(tdc), "DMA ERR_STA %x\n",
tdc_read(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS));
}
static int tegra_dma_sid_reserve(struct tegra_dma_channel *tdc,
enum dma_transfer_direction direction)
{
struct tegra_dma *tdma = tdc->tdma;
int sid = tdc->slave_id;
if (!is_slave_direction(direction))
return 0;
switch (direction) {
case DMA_MEM_TO_DEV:
if (test_and_set_bit(sid, &tdma->sid_m2d_reserved)) {
dev_err(tdma->dev, "slave id already in use\n");
return -EINVAL;
}
break;
case DMA_DEV_TO_MEM:
if (test_and_set_bit(sid, &tdma->sid_d2m_reserved)) {
dev_err(tdma->dev, "slave id already in use\n");
return -EINVAL;
}
break;
default:
break;
}
tdc->sid_dir = direction;
return 0;
}
static void tegra_dma_sid_free(struct tegra_dma_channel *tdc)
{
struct tegra_dma *tdma = tdc->tdma;
int sid = tdc->slave_id;
switch (tdc->sid_dir) {
case DMA_MEM_TO_DEV:
clear_bit(sid, &tdma->sid_m2d_reserved);
break;
case DMA_DEV_TO_MEM:
clear_bit(sid, &tdma->sid_d2m_reserved);
break;
default:
break;
}
tdc->sid_dir = DMA_TRANS_NONE;
}
static void tegra_dma_desc_free(struct virt_dma_desc *vd)
{
kfree(container_of(vd, struct tegra_dma_desc, vd));
}
static int tegra_dma_slave_config(struct dma_chan *dc,
struct dma_slave_config *sconfig)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
tdc->config_init = true;
return 0;
}
static int tegra_dma_pause(struct tegra_dma_channel *tdc)
{
int ret;
u32 val;
val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSRE);
val |= TEGRA_GPCDMA_CHAN_CSRE_PAUSE;
tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, val);
/* Wait until busy bit is de-asserted */
ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
tdc->chan_base_offset + TEGRA_GPCDMA_CHAN_STATUS,
val,
!(val & TEGRA_GPCDMA_STATUS_BUSY),
TEGRA_GPCDMA_BURST_COMPLETE_TIME,
TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
if (ret) {
dev_err(tdc2dev(tdc), "DMA pause timed out\n");
tegra_dma_dump_chan_regs(tdc);
}
return ret;
}
static int tegra_dma_device_pause(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
unsigned long flags;
int ret;
if (!tdc->tdma->chip_data->hw_support_pause)
return -ENOSYS;
spin_lock_irqsave(&tdc->vc.lock, flags);
ret = tegra_dma_pause(tdc);
spin_unlock_irqrestore(&tdc->vc.lock, flags);
return ret;
}
static void tegra_dma_resume(struct tegra_dma_channel *tdc)
{
u32 val;
val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSRE);
val &= ~TEGRA_GPCDMA_CHAN_CSRE_PAUSE;
tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, val);
}
static int tegra_dma_device_resume(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
unsigned long flags;
if (!tdc->tdma->chip_data->hw_support_pause)
return -ENOSYS;
spin_lock_irqsave(&tdc->vc.lock, flags);
tegra_dma_resume(tdc);
spin_unlock_irqrestore(&tdc->vc.lock, flags);
return 0;
}
static inline int tegra_dma_pause_noerr(struct tegra_dma_channel *tdc)
{
/* Return 0 irrespective of PAUSE status.
* This is useful to recover channels that can exit out of flush
* state when the channel is disabled.
*/
tegra_dma_pause(tdc);
return 0;
}
static void tegra_dma_disable(struct tegra_dma_channel *tdc)
{
u32 csr, status;
csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
/* Disable interrupts */
csr &= ~TEGRA_GPCDMA_CSR_IE_EOC;
/* Disable DMA */
csr &= ~TEGRA_GPCDMA_CSR_ENB;
tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
/* Clear interrupt status if it is there */
status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
if (status & TEGRA_GPCDMA_STATUS_ISE_EOC) {
dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS, status);
}
}
static void tegra_dma_configure_next_sg(struct tegra_dma_channel *tdc)
{
struct tegra_dma_desc *dma_desc = tdc->dma_desc;
struct tegra_dma_channel_regs *ch_regs;
int ret;
u32 val;
dma_desc->sg_idx++;
/* Reset the sg index for cyclic transfers */
if (dma_desc->sg_idx == dma_desc->sg_count)
dma_desc->sg_idx = 0;
/* Configure next transfer immediately after DMA is busy */
ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
tdc->chan_base_offset + TEGRA_GPCDMA_CHAN_STATUS,
val,
(val & TEGRA_GPCDMA_STATUS_BUSY), 0,
TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
if (ret)
return;
ch_regs = &dma_desc->sg_req[dma_desc->sg_idx].ch_regs;
tdc_write(tdc, TEGRA_GPCDMA_CHAN_WCOUNT, ch_regs->wcount);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR, ch_regs->src_ptr);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_DST_PTR, ch_regs->dst_ptr);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR, ch_regs->high_addr_ptr);
/* Start DMA */
tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR,
ch_regs->csr | TEGRA_GPCDMA_CSR_ENB);
}
static void tegra_dma_start(struct tegra_dma_channel *tdc)
{
struct tegra_dma_desc *dma_desc = tdc->dma_desc;
struct tegra_dma_channel_regs *ch_regs;
struct virt_dma_desc *vdesc;
if (!dma_desc) {
vdesc = vchan_next_desc(&tdc->vc);
if (!vdesc)
return;
dma_desc = vd_to_tegra_dma_desc(vdesc);
list_del(&vdesc->node);
dma_desc->tdc = tdc;
tdc->dma_desc = dma_desc;
tegra_dma_resume(tdc);
}
ch_regs = &dma_desc->sg_req[dma_desc->sg_idx].ch_regs;
tdc_write(tdc, TEGRA_GPCDMA_CHAN_WCOUNT, ch_regs->wcount);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, 0);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR, ch_regs->src_ptr);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_DST_PTR, ch_regs->dst_ptr);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR, ch_regs->high_addr_ptr);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_FIXED_PATTERN, ch_regs->fixed_pattern);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ, ch_regs->mmio_seq);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, ch_regs->mc_seq);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, ch_regs->csr);
/* Start DMA */
tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR,
ch_regs->csr | TEGRA_GPCDMA_CSR_ENB);
}
static void tegra_dma_xfer_complete(struct tegra_dma_channel *tdc)
{
vchan_cookie_complete(&tdc->dma_desc->vd);
tegra_dma_sid_free(tdc);
tdc->dma_desc = NULL;
}
static void tegra_dma_chan_decode_error(struct tegra_dma_channel *tdc,
unsigned int err_status)
{
switch (TEGRA_GPCDMA_CHAN_ERR_TYPE(err_status)) {
case TEGRA_DMA_BM_FIFO_FULL_ERR:
dev_err(tdc->tdma->dev,
"GPCDMA CH%d bm fifo full\n", tdc->id);
break;
case TEGRA_DMA_PERIPH_FIFO_FULL_ERR:
dev_err(tdc->tdma->dev,
"GPCDMA CH%d peripheral fifo full\n", tdc->id);
break;
case TEGRA_DMA_PERIPH_ID_ERR:
dev_err(tdc->tdma->dev,
"GPCDMA CH%d illegal peripheral id\n", tdc->id);
break;
case TEGRA_DMA_STREAM_ID_ERR:
dev_err(tdc->tdma->dev,
"GPCDMA CH%d illegal stream id\n", tdc->id);
break;
case TEGRA_DMA_MC_SLAVE_ERR:
dev_err(tdc->tdma->dev,
"GPCDMA CH%d mc slave error\n", tdc->id);
break;
case TEGRA_DMA_MMIO_SLAVE_ERR:
dev_err(tdc->tdma->dev,
"GPCDMA CH%d mmio slave error\n", tdc->id);
break;
default:
dev_err(tdc->tdma->dev,
"GPCDMA CH%d security violation %x\n", tdc->id,
err_status);
}
}
static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
{
struct tegra_dma_channel *tdc = dev_id;
struct tegra_dma_desc *dma_desc = tdc->dma_desc;
struct tegra_dma_sg_req *sg_req;
u32 status;
/* Check channel error status register */
status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS);
if (status) {
tegra_dma_chan_decode_error(tdc, status);
tegra_dma_dump_chan_regs(tdc);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_ERR_STATUS, 0xFFFFFFFF);
}
spin_lock(&tdc->vc.lock);
status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
if (!(status & TEGRA_GPCDMA_STATUS_ISE_EOC))
goto irq_done;
tdc_write(tdc, TEGRA_GPCDMA_CHAN_STATUS,
TEGRA_GPCDMA_STATUS_ISE_EOC);
if (!dma_desc)
goto irq_done;
sg_req = dma_desc->sg_req;
dma_desc->bytes_xfer += sg_req[dma_desc->sg_idx].len;
if (dma_desc->cyclic) {
vchan_cyclic_callback(&dma_desc->vd);
tegra_dma_configure_next_sg(tdc);
} else {
dma_desc->sg_idx++;
if (dma_desc->sg_idx == dma_desc->sg_count)
tegra_dma_xfer_complete(tdc);
else
tegra_dma_start(tdc);
}
irq_done:
spin_unlock(&tdc->vc.lock);
return IRQ_HANDLED;
}
static void tegra_dma_issue_pending(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
unsigned long flags;
if (tdc->dma_desc)
return;
spin_lock_irqsave(&tdc->vc.lock, flags);
if (vchan_issue_pending(&tdc->vc))
tegra_dma_start(tdc);
/*
* For cyclic DMA transfers, program the second
* transfer parameters as soon as the first DMA
* transfer is started inorder for the DMA
* controller to trigger the second transfer
* with the correct parameters.
*/
if (tdc->dma_desc && tdc->dma_desc->cyclic)
tegra_dma_configure_next_sg(tdc);
spin_unlock_irqrestore(&tdc->vc.lock, flags);
}
static int tegra_dma_stop_client(struct tegra_dma_channel *tdc)
{
int ret;
u32 status, csr;
/*
* Change the client associated with the DMA channel
* to stop DMA engine from starting any more bursts for
* the given client and wait for in flight bursts to complete
*/
csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
csr &= ~(TEGRA_GPCDMA_CSR_REQ_SEL_MASK);
csr |= TEGRA_GPCDMA_CSR_REQ_SEL_UNUSED;
tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR, csr);
/* Wait for in flight data transfer to finish */
udelay(TEGRA_GPCDMA_BURST_COMPLETE_TIME);
/* If TX/RX path is still active wait till it becomes
* inactive
*/
ret = readl_relaxed_poll_timeout_atomic(tdc->tdma->base_addr +
tdc->chan_base_offset +
TEGRA_GPCDMA_CHAN_STATUS,
status,
!(status & (TEGRA_GPCDMA_STATUS_CHANNEL_TX |
TEGRA_GPCDMA_STATUS_CHANNEL_RX)),
5,
TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT);
if (ret) {
dev_err(tdc2dev(tdc), "Timeout waiting for DMA burst completion!\n");
tegra_dma_dump_chan_regs(tdc);
}
return ret;
}
static int tegra_dma_terminate_all(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
unsigned long flags;
LIST_HEAD(head);
int err;
spin_lock_irqsave(&tdc->vc.lock, flags);
if (tdc->dma_desc) {
err = tdc->tdma->chip_data->terminate(tdc);
if (err) {
spin_unlock_irqrestore(&tdc->vc.lock, flags);
return err;
}
vchan_terminate_vdesc(&tdc->dma_desc->vd);
tegra_dma_disable(tdc);
tdc->dma_desc = NULL;
}
tegra_dma_sid_free(tdc);
vchan_get_all_descriptors(&tdc->vc, &head);
spin_unlock_irqrestore(&tdc->vc.lock, flags);
vchan_dma_desc_free_list(&tdc->vc, &head);
return 0;
}
static int tegra_dma_get_residual(struct tegra_dma_channel *tdc)
{
struct tegra_dma_desc *dma_desc = tdc->dma_desc;
struct tegra_dma_sg_req *sg_req = dma_desc->sg_req;
unsigned int bytes_xfer, residual;
u32 wcount = 0, status;
wcount = tdc_read(tdc, TEGRA_GPCDMA_CHAN_XFER_COUNT);
/*
* Set wcount = 0 if EOC bit is set. The transfer would have
* already completed and the CHAN_XFER_COUNT could have updated
* for the next transfer, specifically in case of cyclic transfers.
*/
status = tdc_read(tdc, TEGRA_GPCDMA_CHAN_STATUS);
if (status & TEGRA_GPCDMA_STATUS_ISE_EOC)
wcount = 0;
bytes_xfer = dma_desc->bytes_xfer +
sg_req[dma_desc->sg_idx].len - (wcount * 4);
residual = dma_desc->bytes_req - (bytes_xfer % dma_desc->bytes_req);
return residual;
}
static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
struct tegra_dma_desc *dma_desc;
struct virt_dma_desc *vd;
unsigned int residual;
unsigned long flags;
enum dma_status ret;
ret = dma_cookie_status(dc, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
spin_lock_irqsave(&tdc->vc.lock, flags);
vd = vchan_find_desc(&tdc->vc, cookie);
if (vd) {
dma_desc = vd_to_tegra_dma_desc(vd);
residual = dma_desc->bytes_req;
dma_set_residue(txstate, residual);
} else if (tdc->dma_desc && tdc->dma_desc->vd.tx.cookie == cookie) {
residual = tegra_dma_get_residual(tdc);
dma_set_residue(txstate, residual);
} else {
dev_err(tdc2dev(tdc), "cookie %d is not found\n", cookie);
}
spin_unlock_irqrestore(&tdc->vc.lock, flags);
return ret;
}
static inline int get_bus_width(struct tegra_dma_channel *tdc,
enum dma_slave_buswidth slave_bw)
{
switch (slave_bw) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_8;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_16;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
return TEGRA_GPCDMA_MMIOSEQ_BUS_WIDTH_32;
default:
dev_err(tdc2dev(tdc), "given slave bus width is not supported\n");
return -EINVAL;
}
}
static unsigned int get_burst_size(struct tegra_dma_channel *tdc,
u32 burst_size, enum dma_slave_buswidth slave_bw,
int len)
{
unsigned int burst_mmio_width, burst_byte;
/*
* burst_size from client is in terms of the bus_width.
* convert that into words.
* If burst_size is not specified from client, then use
* len to calculate the optimum burst size
*/
burst_byte = burst_size ? burst_size * slave_bw : len;
burst_mmio_width = burst_byte / 4;
if (burst_mmio_width < TEGRA_GPCDMA_MMIOSEQ_BURST_MIN)
return 0;
burst_mmio_width = min(burst_mmio_width, TEGRA_GPCDMA_MMIOSEQ_BURST_MAX);
return TEGRA_GPCDMA_MMIOSEQ_BURST(burst_mmio_width);
}
static int get_transfer_param(struct tegra_dma_channel *tdc,
enum dma_transfer_direction direction,
u32 *apb_addr,
u32 *mmio_seq,
u32 *csr,
unsigned int *burst_size,
enum dma_slave_buswidth *slave_bw)
{
switch (direction) {
case DMA_MEM_TO_DEV:
*apb_addr = tdc->dma_sconfig.dst_addr;
*mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
*burst_size = tdc->dma_sconfig.dst_maxburst;
*slave_bw = tdc->dma_sconfig.dst_addr_width;
*csr = TEGRA_GPCDMA_CSR_DMA_MEM2IO_FC;
return 0;
case DMA_DEV_TO_MEM:
*apb_addr = tdc->dma_sconfig.src_addr;
*mmio_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
*burst_size = tdc->dma_sconfig.src_maxburst;
*slave_bw = tdc->dma_sconfig.src_addr_width;
*csr = TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC;
return 0;
default:
dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
}
return -EINVAL;
}
static struct dma_async_tx_descriptor *
tegra_dma_prep_dma_memset(struct dma_chan *dc, dma_addr_t dest, int value,
size_t len, unsigned long flags)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
unsigned int max_dma_count = tdc->tdma->chip_data->max_dma_count;
struct tegra_dma_sg_req *sg_req;
struct tegra_dma_desc *dma_desc;
u32 csr, mc_seq;
if ((len & 3) || (dest & 3) || len > max_dma_count) {
dev_err(tdc2dev(tdc),
"DMA length/memory address is not supported\n");
return NULL;
}
/* Set DMA mode to fixed pattern */
csr = TEGRA_GPCDMA_CSR_DMA_FIXED_PAT;
/* Enable once or continuous mode */
csr |= TEGRA_GPCDMA_CSR_ONCE;
/* Enable IRQ mask */
csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
/* Enable the DMA interrupt */
if (flags & DMA_PREP_INTERRUPT)
csr |= TEGRA_GPCDMA_CSR_IE_EOC;
/* Configure default priority weight for the channel */
csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
/* retain stream-id and clean rest */
mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
/* Set the address wrapping */
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
/* Program outstanding MC requests */
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
/* Set burst size */
mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
dma_desc = kzalloc(struct_size(dma_desc, sg_req, 1), GFP_NOWAIT);
if (!dma_desc)
return NULL;
dma_desc->bytes_req = len;
dma_desc->sg_count = 1;
sg_req = dma_desc->sg_req;
sg_req[0].ch_regs.src_ptr = 0;
sg_req[0].ch_regs.dst_ptr = dest;
sg_req[0].ch_regs.high_addr_ptr =
FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
sg_req[0].ch_regs.fixed_pattern = value;
/* Word count reg takes value as (N +1) words */
sg_req[0].ch_regs.wcount = ((len - 4) >> 2);
sg_req[0].ch_regs.csr = csr;
sg_req[0].ch_regs.mmio_seq = 0;
sg_req[0].ch_regs.mc_seq = mc_seq;
sg_req[0].len = len;
dma_desc->cyclic = false;
return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
}
static struct dma_async_tx_descriptor *
tegra_dma_prep_dma_memcpy(struct dma_chan *dc, dma_addr_t dest,
dma_addr_t src, size_t len, unsigned long flags)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
struct tegra_dma_sg_req *sg_req;
struct tegra_dma_desc *dma_desc;
unsigned int max_dma_count;
u32 csr, mc_seq;
max_dma_count = tdc->tdma->chip_data->max_dma_count;
if ((len & 3) || (src & 3) || (dest & 3) || len > max_dma_count) {
dev_err(tdc2dev(tdc),
"DMA length/memory address is not supported\n");
return NULL;
}
/* Set DMA mode to memory to memory transfer */
csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
/* Enable once or continuous mode */
csr |= TEGRA_GPCDMA_CSR_ONCE;
/* Enable IRQ mask */
csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
/* Enable the DMA interrupt */
if (flags & DMA_PREP_INTERRUPT)
csr |= TEGRA_GPCDMA_CSR_IE_EOC;
/* Configure default priority weight for the channel */
csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
/* retain stream-id and clean rest */
mc_seq &= (TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK) |
(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
/* Set the address wrapping */
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
/* Program outstanding MC requests */
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
/* Set burst size */
mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
dma_desc = kzalloc(struct_size(dma_desc, sg_req, 1), GFP_NOWAIT);
if (!dma_desc)
return NULL;
dma_desc->bytes_req = len;
dma_desc->sg_count = 1;
sg_req = dma_desc->sg_req;
sg_req[0].ch_regs.src_ptr = src;
sg_req[0].ch_regs.dst_ptr = dest;
sg_req[0].ch_regs.high_addr_ptr =
FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (src >> 32));
sg_req[0].ch_regs.high_addr_ptr |=
FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (dest >> 32));
/* Word count reg takes value as (N +1) words */
sg_req[0].ch_regs.wcount = ((len - 4) >> 2);
sg_req[0].ch_regs.csr = csr;
sg_req[0].ch_regs.mmio_seq = 0;
sg_req[0].ch_regs.mc_seq = mc_seq;
sg_req[0].len = len;
dma_desc->cyclic = false;
return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
}
static struct dma_async_tx_descriptor *
tegra_dma_prep_slave_sg(struct dma_chan *dc, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
unsigned int max_dma_count = tdc->tdma->chip_data->max_dma_count;
enum dma_slave_buswidth slave_bw = DMA_SLAVE_BUSWIDTH_UNDEFINED;
u32 csr, mc_seq, apb_ptr = 0, mmio_seq = 0;
struct tegra_dma_sg_req *sg_req;
struct tegra_dma_desc *dma_desc;
struct scatterlist *sg;
u32 burst_size;
unsigned int i;
int ret;
if (!tdc->config_init) {
dev_err(tdc2dev(tdc), "DMA channel is not configured\n");
return NULL;
}
if (sg_len < 1) {
dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
return NULL;
}
ret = tegra_dma_sid_reserve(tdc, direction);
if (ret)
return NULL;
ret = get_transfer_param(tdc, direction, &apb_ptr, &mmio_seq, &csr,
&burst_size, &slave_bw);
if (ret < 0)
return NULL;
/* Enable once or continuous mode */
csr |= TEGRA_GPCDMA_CSR_ONCE;
/* Program the slave id in requestor select */
csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, tdc->slave_id);
/* Enable IRQ mask */
csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
/* Configure default priority weight for the channel*/
csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
/* Enable the DMA interrupt */
if (flags & DMA_PREP_INTERRUPT)
csr |= TEGRA_GPCDMA_CSR_IE_EOC;
mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
/* retain stream-id and clean rest */
mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
/* Set the address wrapping on both MC and MMIO side */
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
mmio_seq |= FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD, 1);
/* Program 2 MC outstanding requests by default. */
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
/* Setting MC burst size depending on MMIO burst size */
if (burst_size == 64)
mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
else
mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_2;
dma_desc = kzalloc(struct_size(dma_desc, sg_req, sg_len), GFP_NOWAIT);
if (!dma_desc)
return NULL;
dma_desc->sg_count = sg_len;
sg_req = dma_desc->sg_req;
/* Make transfer requests */
for_each_sg(sgl, sg, sg_len, i) {
u32 len;
dma_addr_t mem;
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
if ((len & 3) || (mem & 3) || len > max_dma_count) {
dev_err(tdc2dev(tdc),
"DMA length/memory address is not supported\n");
kfree(dma_desc);
return NULL;
}
mmio_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
dma_desc->bytes_req += len;
if (direction == DMA_MEM_TO_DEV) {
sg_req[i].ch_regs.src_ptr = mem;
sg_req[i].ch_regs.dst_ptr = apb_ptr;
sg_req[i].ch_regs.high_addr_ptr =
FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (mem >> 32));
} else if (direction == DMA_DEV_TO_MEM) {
sg_req[i].ch_regs.src_ptr = apb_ptr;
sg_req[i].ch_regs.dst_ptr = mem;
sg_req[i].ch_regs.high_addr_ptr =
FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (mem >> 32));
}
/*
* Word count register takes input in words. Writing a value
* of N into word count register means a req of (N+1) words.
*/
sg_req[i].ch_regs.wcount = ((len - 4) >> 2);
sg_req[i].ch_regs.csr = csr;
sg_req[i].ch_regs.mmio_seq = mmio_seq;
sg_req[i].ch_regs.mc_seq = mc_seq;
sg_req[i].len = len;
}
dma_desc->cyclic = false;
return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
}
static struct dma_async_tx_descriptor *
tegra_dma_prep_dma_cyclic(struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
enum dma_slave_buswidth slave_bw = DMA_SLAVE_BUSWIDTH_UNDEFINED;
u32 csr, mc_seq, apb_ptr = 0, mmio_seq = 0, burst_size;
unsigned int max_dma_count, len, period_count, i;
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
struct tegra_dma_desc *dma_desc;
struct tegra_dma_sg_req *sg_req;
dma_addr_t mem = buf_addr;
int ret;
if (!buf_len || !period_len) {
dev_err(tdc2dev(tdc), "Invalid buffer/period len\n");
return NULL;
}
if (!tdc->config_init) {
dev_err(tdc2dev(tdc), "DMA slave is not configured\n");
return NULL;
}
ret = tegra_dma_sid_reserve(tdc, direction);
if (ret)
return NULL;
/*
* We only support cycle transfer when buf_len is multiple of
* period_len.
*/
if (buf_len % period_len) {
dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n");
return NULL;
}
len = period_len;
max_dma_count = tdc->tdma->chip_data->max_dma_count;
if ((len & 3) || (buf_addr & 3) || len > max_dma_count) {
dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n");
return NULL;
}
ret = get_transfer_param(tdc, direction, &apb_ptr, &mmio_seq, &csr,
&burst_size, &slave_bw);
if (ret < 0)
return NULL;
/* Enable once or continuous mode */
csr &= ~TEGRA_GPCDMA_CSR_ONCE;
/* Program the slave id in requestor select */
csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_REQ_SEL_MASK, tdc->slave_id);
/* Enable IRQ mask */
csr |= TEGRA_GPCDMA_CSR_IRQ_MASK;
/* Configure default priority weight for the channel*/
csr |= FIELD_PREP(TEGRA_GPCDMA_CSR_WEIGHT, 1);
/* Enable the DMA interrupt */
if (flags & DMA_PREP_INTERRUPT)
csr |= TEGRA_GPCDMA_CSR_IE_EOC;
mmio_seq |= FIELD_PREP(TEGRA_GPCDMA_MMIOSEQ_WRAP_WORD, 1);
mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
/* retain stream-id and clean rest */
mc_seq &= TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK;
/* Set the address wrapping on both MC and MMIO side */
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP0,
TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_WRAP1,
TEGRA_GPCDMA_MCSEQ_WRAP_NONE);
/* Program 2 MC outstanding requests by default. */
mc_seq |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_REQ_COUNT, 1);
/* Setting MC burst size depending on MMIO burst size */
if (burst_size == 64)
mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_16;
else
mc_seq |= TEGRA_GPCDMA_MCSEQ_BURST_2;
period_count = buf_len / period_len;
dma_desc = kzalloc(struct_size(dma_desc, sg_req, period_count),
GFP_NOWAIT);
if (!dma_desc)
return NULL;
dma_desc->bytes_req = buf_len;
dma_desc->sg_count = period_count;
sg_req = dma_desc->sg_req;
/* Split transfer equal to period size */
for (i = 0; i < period_count; i++) {
mmio_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
if (direction == DMA_MEM_TO_DEV) {
sg_req[i].ch_regs.src_ptr = mem;
sg_req[i].ch_regs.dst_ptr = apb_ptr;
sg_req[i].ch_regs.high_addr_ptr =
FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_SRC_PTR, (mem >> 32));
} else if (direction == DMA_DEV_TO_MEM) {
sg_req[i].ch_regs.src_ptr = apb_ptr;
sg_req[i].ch_regs.dst_ptr = mem;
sg_req[i].ch_regs.high_addr_ptr =
FIELD_PREP(TEGRA_GPCDMA_HIGH_ADDR_DST_PTR, (mem >> 32));
}
/*
* Word count register takes input in words. Writing a value
* of N into word count register means a req of (N+1) words.
*/
sg_req[i].ch_regs.wcount = ((len - 4) >> 2);
sg_req[i].ch_regs.csr = csr;
sg_req[i].ch_regs.mmio_seq = mmio_seq;
sg_req[i].ch_regs.mc_seq = mc_seq;
sg_req[i].len = len;
mem += len;
}
dma_desc->cyclic = true;
return vchan_tx_prep(&tdc->vc, &dma_desc->vd, flags);
}
static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
int ret;
ret = request_irq(tdc->irq, tegra_dma_isr, 0, tdc->name, tdc);
if (ret) {
dev_err(tdc2dev(tdc), "request_irq failed for %s\n", tdc->name);
return ret;
}
dma_cookie_init(&tdc->vc.chan);
tdc->config_init = false;
return 0;
}
static void tegra_dma_chan_synchronize(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
synchronize_irq(tdc->irq);
vchan_synchronize(&tdc->vc);
}
static void tegra_dma_free_chan_resources(struct dma_chan *dc)
{
struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
tegra_dma_terminate_all(dc);
synchronize_irq(tdc->irq);
tasklet_kill(&tdc->vc.task);
tdc->config_init = false;
tdc->slave_id = -1;
tdc->sid_dir = DMA_TRANS_NONE;
free_irq(tdc->irq, tdc);
vchan_free_chan_resources(&tdc->vc);
}
static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct tegra_dma *tdma = ofdma->of_dma_data;
struct tegra_dma_channel *tdc;
struct dma_chan *chan;
chan = dma_get_any_slave_channel(&tdma->dma_dev);
if (!chan)
return NULL;
tdc = to_tegra_dma_chan(chan);
tdc->slave_id = dma_spec->args[0];
return chan;
}
static const struct tegra_dma_chip_data tegra186_dma_chip_data = {
.nr_channels = 32,
.channel_reg_size = SZ_64K,
.max_dma_count = SZ_1G,
.hw_support_pause = false,
.terminate = tegra_dma_stop_client,
};
static const struct tegra_dma_chip_data tegra194_dma_chip_data = {
.nr_channels = 32,
.channel_reg_size = SZ_64K,
.max_dma_count = SZ_1G,
.hw_support_pause = true,
.terminate = tegra_dma_pause,
};
static const struct tegra_dma_chip_data tegra234_dma_chip_data = {
.nr_channels = 32,
.channel_reg_size = SZ_64K,
.max_dma_count = SZ_1G,
.hw_support_pause = true,
.terminate = tegra_dma_pause_noerr,
};
static const struct of_device_id tegra_dma_of_match[] = {
{
.compatible = "nvidia,tegra186-gpcdma",
.data = &tegra186_dma_chip_data,
}, {
.compatible = "nvidia,tegra194-gpcdma",
.data = &tegra194_dma_chip_data,
}, {
.compatible = "nvidia,tegra234-gpcdma",
.data = &tegra234_dma_chip_data,
}, {
},
};
MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
static int tegra_dma_program_sid(struct tegra_dma_channel *tdc, int stream_id)
{
unsigned int reg_val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK);
reg_val &= ~(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK);
reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID0_MASK, stream_id);
reg_val |= FIELD_PREP(TEGRA_GPCDMA_MCSEQ_STREAM_ID1_MASK, stream_id);
tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, reg_val);
return 0;
}
static int tegra_dma_probe(struct platform_device *pdev)
{
const struct tegra_dma_chip_data *cdata = NULL;
struct iommu_fwspec *iommu_spec;
unsigned int stream_id, i;
struct tegra_dma *tdma;
int ret;
cdata = of_device_get_match_data(&pdev->dev);
tdma = devm_kzalloc(&pdev->dev,
struct_size(tdma, channels, cdata->nr_channels),
GFP_KERNEL);
if (!tdma)
return -ENOMEM;
tdma->dev = &pdev->dev;
tdma->chip_data = cdata;
platform_set_drvdata(pdev, tdma);
tdma->base_addr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(tdma->base_addr))
return PTR_ERR(tdma->base_addr);
tdma->rst = devm_reset_control_get_exclusive(&pdev->dev, "gpcdma");
if (IS_ERR(tdma->rst)) {
return dev_err_probe(&pdev->dev, PTR_ERR(tdma->rst),
"Missing controller reset\n");
}
reset_control_reset(tdma->rst);
tdma->dma_dev.dev = &pdev->dev;
iommu_spec = dev_iommu_fwspec_get(&pdev->dev);
if (!iommu_spec) {
dev_err(&pdev->dev, "Missing iommu stream-id\n");
return -EINVAL;
}
stream_id = iommu_spec->ids[0] & 0xffff;
ret = device_property_read_u32(&pdev->dev, "dma-channel-mask",
&tdma->chan_mask);
if (ret) {
dev_warn(&pdev->dev,
"Missing dma-channel-mask property, using default channel mask %#x\n",
TEGRA_GPCDMA_DEFAULT_CHANNEL_MASK);
tdma->chan_mask = TEGRA_GPCDMA_DEFAULT_CHANNEL_MASK;
}
INIT_LIST_HEAD(&tdma->dma_dev.channels);
for (i = 0; i < cdata->nr_channels; i++) {
struct tegra_dma_channel *tdc = &tdma->channels[i];
/* Check for channel mask */
if (!(tdma->chan_mask & BIT(i)))
continue;
tdc->irq = platform_get_irq(pdev, i);
if (tdc->irq < 0)
return tdc->irq;
tdc->chan_base_offset = TEGRA_GPCDMA_CHANNEL_BASE_ADDR_OFFSET +
i * cdata->channel_reg_size;
snprintf(tdc->name, sizeof(tdc->name), "gpcdma.%d", i);
tdc->tdma = tdma;
tdc->id = i;
tdc->slave_id = -1;
vchan_init(&tdc->vc, &tdma->dma_dev);
tdc->vc.desc_free = tegra_dma_desc_free;
/* program stream-id for this channel */
tegra_dma_program_sid(tdc, stream_id);
tdc->stream_id = stream_id;
}
dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
dma_cap_set(DMA_MEMCPY, tdma->dma_dev.cap_mask);
dma_cap_set(DMA_MEMSET, tdma->dma_dev.cap_mask);
dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
/*
* Only word aligned transfers are supported. Set the copy
* alignment shift.
*/
tdma->dma_dev.copy_align = 2;
tdma->dma_dev.fill_align = 2;
tdma->dma_dev.device_alloc_chan_resources =
tegra_dma_alloc_chan_resources;
tdma->dma_dev.device_free_chan_resources =
tegra_dma_free_chan_resources;
tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg;
tdma->dma_dev.device_prep_dma_memcpy = tegra_dma_prep_dma_memcpy;
tdma->dma_dev.device_prep_dma_memset = tegra_dma_prep_dma_memset;
tdma->dma_dev.device_prep_dma_cyclic = tegra_dma_prep_dma_cyclic;
tdma->dma_dev.device_config = tegra_dma_slave_config;
tdma->dma_dev.device_terminate_all = tegra_dma_terminate_all;
tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
tdma->dma_dev.device_pause = tegra_dma_device_pause;
tdma->dma_dev.device_resume = tegra_dma_device_resume;
tdma->dma_dev.device_synchronize = tegra_dma_chan_synchronize;
tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
ret = dma_async_device_register(&tdma->dma_dev);
if (ret < 0) {
dev_err_probe(&pdev->dev, ret,
"GPC DMA driver registration failed\n");
return ret;
}
ret = of_dma_controller_register(pdev->dev.of_node,
tegra_dma_of_xlate, tdma);
if (ret < 0) {
dev_err_probe(&pdev->dev, ret,
"GPC DMA OF registration failed\n");
dma_async_device_unregister(&tdma->dma_dev);
return ret;
}
dev_info(&pdev->dev, "GPC DMA driver register %lu channels\n",
hweight_long(tdma->chan_mask));
return 0;
}
static int tegra_dma_remove(struct platform_device *pdev)
{
struct tegra_dma *tdma = platform_get_drvdata(pdev);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&tdma->dma_dev);
return 0;
}
static int __maybe_unused tegra_dma_pm_suspend(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
unsigned int i;
for (i = 0; i < tdma->chip_data->nr_channels; i++) {
struct tegra_dma_channel *tdc = &tdma->channels[i];
if (!(tdma->chan_mask & BIT(i)))
continue;
if (tdc->dma_desc) {
dev_err(tdma->dev, "channel %u busy\n", i);
return -EBUSY;
}
}
return 0;
}
static int __maybe_unused tegra_dma_pm_resume(struct device *dev)
{
struct tegra_dma *tdma = dev_get_drvdata(dev);
unsigned int i;
reset_control_reset(tdma->rst);
for (i = 0; i < tdma->chip_data->nr_channels; i++) {
struct tegra_dma_channel *tdc = &tdma->channels[i];
if (!(tdma->chan_mask & BIT(i)))
continue;
tegra_dma_program_sid(tdc, tdc->stream_id);
}
return 0;
}
static const struct dev_pm_ops tegra_dma_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume)
};
static struct platform_driver tegra_dma_driver = {
.driver = {
.name = "tegra-gpcdma",
.pm = &tegra_dma_dev_pm_ops,
.of_match_table = tegra_dma_of_match,
},
.probe = tegra_dma_probe,
.remove = tegra_dma_remove,
};
module_platform_driver(tegra_dma_driver);
MODULE_DESCRIPTION("NVIDIA Tegra GPC DMA Controller driver");
MODULE_AUTHOR("Pavan Kunapuli <[email protected]>");
MODULE_AUTHOR("Rajesh Gumasta <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/tegra186-gpc-dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* ACPI helpers for DMA request / controller
*
* Based on of-dma.c
*
* Copyright (C) 2013, Intel Corporation
* Authors: Andy Shevchenko <[email protected]>
* Mika Westerberg <[email protected]>
*/
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/acpi_dma.h>
#include <linux/property.h>
static LIST_HEAD(acpi_dma_list);
static DEFINE_MUTEX(acpi_dma_lock);
/**
* acpi_dma_parse_resource_group - match device and parse resource group
* @grp: CSRT resource group
* @adev: ACPI device to match with
* @adma: struct acpi_dma of the given DMA controller
*
* In order to match a device from DSDT table to the corresponding CSRT device
* we use MMIO address and IRQ.
*
* Return:
* 1 on success, 0 when no information is available, or appropriate errno value
* on error.
*/
static int acpi_dma_parse_resource_group(const struct acpi_csrt_group *grp,
struct acpi_device *adev, struct acpi_dma *adma)
{
const struct acpi_csrt_shared_info *si;
struct list_head resource_list;
struct resource_entry *rentry;
resource_size_t mem = 0, irq = 0;
int ret;
if (grp->shared_info_length != sizeof(struct acpi_csrt_shared_info))
return -ENODEV;
INIT_LIST_HEAD(&resource_list);
ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
if (ret <= 0)
return 0;
list_for_each_entry(rentry, &resource_list, node) {
if (resource_type(rentry->res) == IORESOURCE_MEM)
mem = rentry->res->start;
else if (resource_type(rentry->res) == IORESOURCE_IRQ)
irq = rentry->res->start;
}
acpi_dev_free_resource_list(&resource_list);
/* Consider initial zero values as resource not found */
if (mem == 0 && irq == 0)
return 0;
si = (const struct acpi_csrt_shared_info *)&grp[1];
/* Match device by MMIO */
if (si->mmio_base_low != lower_32_bits(mem) ||
si->mmio_base_high != upper_32_bits(mem))
return 0;
/*
* acpi_gsi_to_irq() can't be used because some platforms do not save
* registered IRQs in the MP table. Instead we just try to register
* the GSI, which is the core part of the above mentioned function.
*/
ret = acpi_register_gsi(NULL, si->gsi_interrupt, si->interrupt_mode, si->interrupt_polarity);
if (ret < 0)
return 0;
/* Match device by Linux vIRQ */
if (ret != irq)
return 0;
dev_dbg(&adev->dev, "matches with %.4s%04X (rev %u)\n",
(char *)&grp->vendor_id, grp->device_id, grp->revision);
/* Check if the request line range is available */
if (si->base_request_line == 0 && si->num_handshake_signals == 0)
return 0;
/* Set up DMA mask based on value from CSRT */
ret = dma_coerce_mask_and_coherent(&adev->dev,
DMA_BIT_MASK(si->dma_address_width));
if (ret)
return 0;
adma->base_request_line = si->base_request_line;
adma->end_request_line = si->base_request_line +
si->num_handshake_signals - 1;
dev_dbg(&adev->dev, "request line base: 0x%04x end: 0x%04x\n",
adma->base_request_line, adma->end_request_line);
return 1;
}
/**
* acpi_dma_parse_csrt - parse CSRT to exctract additional DMA resources
* @adev: ACPI device to match with
* @adma: struct acpi_dma of the given DMA controller
*
* CSRT or Core System Resources Table is a proprietary ACPI table
* introduced by Microsoft. This table can contain devices that are not in
* the system DSDT table. In particular DMA controllers might be described
* here.
*
* We are using this table to get the request line range of the specific DMA
* controller to be used later.
*/
static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
{
struct acpi_csrt_group *grp, *end;
struct acpi_table_csrt *csrt;
acpi_status status;
int ret;
status = acpi_get_table(ACPI_SIG_CSRT, 0,
(struct acpi_table_header **)&csrt);
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND)
dev_warn(&adev->dev, "failed to get the CSRT table\n");
return;
}
grp = (struct acpi_csrt_group *)(csrt + 1);
end = (struct acpi_csrt_group *)((void *)csrt + csrt->header.length);
while (grp < end) {
ret = acpi_dma_parse_resource_group(grp, adev, adma);
if (ret < 0) {
dev_warn(&adev->dev,
"error in parsing resource group\n");
break;
}
grp = (struct acpi_csrt_group *)((void *)grp + grp->length);
}
acpi_put_table((struct acpi_table_header *)csrt);
}
/**
* acpi_dma_controller_register - Register a DMA controller to ACPI DMA helpers
* @dev: struct device of DMA controller
* @acpi_dma_xlate: translation function which converts a dma specifier
* into a dma_chan structure
* @data: pointer to controller specific data to be used by
* translation function
*
* Allocated memory should be freed with appropriate acpi_dma_controller_free()
* call.
*
* Return:
* 0 on success or appropriate errno value on error.
*/
int acpi_dma_controller_register(struct device *dev,
struct dma_chan *(*acpi_dma_xlate)
(struct acpi_dma_spec *, struct acpi_dma *),
void *data)
{
struct acpi_device *adev;
struct acpi_dma *adma;
if (!dev || !acpi_dma_xlate)
return -EINVAL;
/* Check if the device was enumerated by ACPI */
adev = ACPI_COMPANION(dev);
if (!adev)
return -EINVAL;
adma = kzalloc(sizeof(*adma), GFP_KERNEL);
if (!adma)
return -ENOMEM;
adma->dev = dev;
adma->acpi_dma_xlate = acpi_dma_xlate;
adma->data = data;
acpi_dma_parse_csrt(adev, adma);
/* Now queue acpi_dma controller structure in list */
mutex_lock(&acpi_dma_lock);
list_add_tail(&adma->dma_controllers, &acpi_dma_list);
mutex_unlock(&acpi_dma_lock);
return 0;
}
EXPORT_SYMBOL_GPL(acpi_dma_controller_register);
/**
* acpi_dma_controller_free - Remove a DMA controller from ACPI DMA helpers list
* @dev: struct device of DMA controller
*
* Memory allocated by acpi_dma_controller_register() is freed here.
*
* Return:
* 0 on success or appropriate errno value on error.
*/
int acpi_dma_controller_free(struct device *dev)
{
struct acpi_dma *adma;
if (!dev)
return -EINVAL;
mutex_lock(&acpi_dma_lock);
list_for_each_entry(adma, &acpi_dma_list, dma_controllers)
if (adma->dev == dev) {
list_del(&adma->dma_controllers);
mutex_unlock(&acpi_dma_lock);
kfree(adma);
return 0;
}
mutex_unlock(&acpi_dma_lock);
return -ENODEV;
}
EXPORT_SYMBOL_GPL(acpi_dma_controller_free);
static void devm_acpi_dma_release(struct device *dev, void *res)
{
acpi_dma_controller_free(dev);
}
/**
* devm_acpi_dma_controller_register - resource managed acpi_dma_controller_register()
* @dev: device that is registering this DMA controller
* @acpi_dma_xlate: translation function
* @data: pointer to controller specific data
*
* Managed acpi_dma_controller_register(). DMA controller registered by this
* function are automatically freed on driver detach. See
* acpi_dma_controller_register() for more information.
*
* Return:
* 0 on success or appropriate errno value on error.
*/
int devm_acpi_dma_controller_register(struct device *dev,
struct dma_chan *(*acpi_dma_xlate)
(struct acpi_dma_spec *, struct acpi_dma *),
void *data)
{
void *res;
int ret;
res = devres_alloc(devm_acpi_dma_release, 0, GFP_KERNEL);
if (!res)
return -ENOMEM;
ret = acpi_dma_controller_register(dev, acpi_dma_xlate, data);
if (ret) {
devres_free(res);
return ret;
}
devres_add(dev, res);
return 0;
}
EXPORT_SYMBOL_GPL(devm_acpi_dma_controller_register);
/**
* devm_acpi_dma_controller_free - resource managed acpi_dma_controller_free()
* @dev: device that is unregistering as DMA controller
*
* Unregister a DMA controller registered with
* devm_acpi_dma_controller_register(). Normally this function will not need to
* be called and the resource management code will ensure that the resource is
* freed.
*/
void devm_acpi_dma_controller_free(struct device *dev)
{
WARN_ON(devres_release(dev, devm_acpi_dma_release, NULL, NULL));
}
EXPORT_SYMBOL_GPL(devm_acpi_dma_controller_free);
/**
* acpi_dma_update_dma_spec - prepare dma specifier to pass to translation function
* @adma: struct acpi_dma of DMA controller
* @dma_spec: dma specifier to update
*
* Accordingly to ACPI 5.0 Specification Table 6-170 "Fixed DMA Resource
* Descriptor":
* DMA Request Line bits is a platform-relative number uniquely
* identifying the request line assigned. Request line-to-Controller
* mapping is done in a controller-specific OS driver.
* That's why we can safely adjust slave_id when the appropriate controller is
* found.
*
* Return:
* 0, if no information is avaiable, -1 on mismatch, and 1 otherwise.
*/
static int acpi_dma_update_dma_spec(struct acpi_dma *adma,
struct acpi_dma_spec *dma_spec)
{
/* Set link to the DMA controller device */
dma_spec->dev = adma->dev;
/* Check if the request line range is available */
if (adma->base_request_line == 0 && adma->end_request_line == 0)
return 0;
/* Check if slave_id falls to the range */
if (dma_spec->slave_id < adma->base_request_line ||
dma_spec->slave_id > adma->end_request_line)
return -1;
/*
* Here we adjust slave_id. It should be a relative number to the base
* request line.
*/
dma_spec->slave_id -= adma->base_request_line;
return 1;
}
struct acpi_dma_parser_data {
struct acpi_dma_spec dma_spec;
size_t index;
size_t n;
};
/**
* acpi_dma_parse_fixed_dma - Parse FixedDMA ACPI resources to a DMA specifier
* @res: struct acpi_resource to get FixedDMA resources from
* @data: pointer to a helper struct acpi_dma_parser_data
*/
static int acpi_dma_parse_fixed_dma(struct acpi_resource *res, void *data)
{
struct acpi_dma_parser_data *pdata = data;
if (res->type == ACPI_RESOURCE_TYPE_FIXED_DMA) {
struct acpi_resource_fixed_dma *dma = &res->data.fixed_dma;
if (pdata->n++ == pdata->index) {
pdata->dma_spec.chan_id = dma->channels;
pdata->dma_spec.slave_id = dma->request_lines;
}
}
/* Tell the ACPI core to skip this resource */
return 1;
}
/**
* acpi_dma_request_slave_chan_by_index - Get the DMA slave channel
* @dev: struct device to get DMA request from
* @index: index of FixedDMA descriptor for @dev
*
* Return:
* Pointer to appropriate dma channel on success or an error pointer.
*/
struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
size_t index)
{
struct acpi_dma_parser_data pdata;
struct acpi_dma_spec *dma_spec = &pdata.dma_spec;
struct acpi_device *adev = ACPI_COMPANION(dev);
struct list_head resource_list;
struct acpi_dma *adma;
struct dma_chan *chan = NULL;
int found;
int ret;
memset(&pdata, 0, sizeof(pdata));
pdata.index = index;
/* Initial values for the request line and channel */
dma_spec->chan_id = -1;
dma_spec->slave_id = -1;
INIT_LIST_HEAD(&resource_list);
ret = acpi_dev_get_resources(adev, &resource_list,
acpi_dma_parse_fixed_dma, &pdata);
acpi_dev_free_resource_list(&resource_list);
if (ret < 0)
return ERR_PTR(ret);
if (dma_spec->slave_id < 0 || dma_spec->chan_id < 0)
return ERR_PTR(-ENODEV);
mutex_lock(&acpi_dma_lock);
list_for_each_entry(adma, &acpi_dma_list, dma_controllers) {
/*
* We are not going to call translation function if slave_id
* doesn't fall to the request range.
*/
found = acpi_dma_update_dma_spec(adma, dma_spec);
if (found < 0)
continue;
chan = adma->acpi_dma_xlate(dma_spec, adma);
/*
* Try to get a channel only from the DMA controller that
* matches the slave_id. See acpi_dma_update_dma_spec()
* description for the details.
*/
if (found > 0 || chan)
break;
}
mutex_unlock(&acpi_dma_lock);
return chan ? chan : ERR_PTR(-EPROBE_DEFER);
}
EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_index);
/**
* acpi_dma_request_slave_chan_by_name - Get the DMA slave channel
* @dev: struct device to get DMA request from
* @name: represents corresponding FixedDMA descriptor for @dev
*
* In order to support both Device Tree and ACPI in a single driver we
* translate the names "tx" and "rx" here based on the most common case where
* the first FixedDMA descriptor is TX and second is RX.
*
* If the device has "dma-names" property the FixedDMA descriptor indices
* are retrieved based on those. Otherwise the function falls back using
* hardcoded indices.
*
* Return:
* Pointer to appropriate dma channel on success or an error pointer.
*/
struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev,
const char *name)
{
int index;
index = device_property_match_string(dev, "dma-names", name);
if (index < 0) {
if (!strcmp(name, "tx"))
index = 0;
else if (!strcmp(name, "rx"))
index = 1;
else
return ERR_PTR(-ENODEV);
}
dev_dbg(dev, "Looking for DMA channel \"%s\" at index %d...\n", name, index);
return acpi_dma_request_slave_chan_by_index(dev, index);
}
EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_name);
/**
* acpi_dma_simple_xlate - Simple ACPI DMA engine translation helper
* @dma_spec: pointer to ACPI DMA specifier
* @adma: pointer to ACPI DMA controller data
*
* A simple translation function for ACPI based devices. Passes &struct
* dma_spec to the DMA controller driver provided filter function.
*
* Return:
* Pointer to the channel if found or %NULL otherwise.
*/
struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec,
struct acpi_dma *adma)
{
struct acpi_dma_filter_info *info = adma->data;
if (!info || !info->filter_fn)
return NULL;
return dma_request_channel(info->dma_cap, info->filter_fn, dma_spec);
}
EXPORT_SYMBOL_GPL(acpi_dma_simple_xlate);
| linux-master | drivers/dma/acpi-dma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DMA driver for STMicroelectronics STi FDMA controller
*
* Copyright (C) 2014 STMicroelectronics
*
* Author: Ludovic Barre <[email protected]>
* Peter Griffin <[email protected]>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/remoteproc.h>
#include <linux/slab.h>
#include "st_fdma.h"
static inline struct st_fdma_chan *to_st_fdma_chan(struct dma_chan *c)
{
return container_of(c, struct st_fdma_chan, vchan.chan);
}
static struct st_fdma_desc *to_st_fdma_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct st_fdma_desc, vdesc);
}
static int st_fdma_dreq_get(struct st_fdma_chan *fchan)
{
struct st_fdma_dev *fdev = fchan->fdev;
u32 req_line_cfg = fchan->cfg.req_line;
u32 dreq_line;
int try = 0;
/*
* dreq_mask is shared for n channels of fdma, so all accesses must be
* atomic. if the dreq_mask is changed between ffz and set_bit,
* we retry
*/
do {
if (fdev->dreq_mask == ~0L) {
dev_err(fdev->dev, "No req lines available\n");
return -EINVAL;
}
if (try || req_line_cfg >= ST_FDMA_NR_DREQS) {
dev_err(fdev->dev, "Invalid or used req line\n");
return -EINVAL;
} else {
dreq_line = req_line_cfg;
}
try++;
} while (test_and_set_bit(dreq_line, &fdev->dreq_mask));
dev_dbg(fdev->dev, "get dreq_line:%d mask:%#lx\n",
dreq_line, fdev->dreq_mask);
return dreq_line;
}
static void st_fdma_dreq_put(struct st_fdma_chan *fchan)
{
struct st_fdma_dev *fdev = fchan->fdev;
dev_dbg(fdev->dev, "put dreq_line:%#x\n", fchan->dreq_line);
clear_bit(fchan->dreq_line, &fdev->dreq_mask);
}
static void st_fdma_xfer_desc(struct st_fdma_chan *fchan)
{
struct virt_dma_desc *vdesc;
unsigned long nbytes, ch_cmd, cmd;
vdesc = vchan_next_desc(&fchan->vchan);
if (!vdesc)
return;
fchan->fdesc = to_st_fdma_desc(vdesc);
nbytes = fchan->fdesc->node[0].desc->nbytes;
cmd = FDMA_CMD_START(fchan->vchan.chan.chan_id);
ch_cmd = fchan->fdesc->node[0].pdesc | FDMA_CH_CMD_STA_START;
/* start the channel for the descriptor */
fnode_write(fchan, nbytes, FDMA_CNTN_OFST);
fchan_write(fchan, ch_cmd, FDMA_CH_CMD_OFST);
writel(cmd,
fchan->fdev->slim_rproc->peri + FDMA_CMD_SET_OFST);
dev_dbg(fchan->fdev->dev, "start chan:%d\n", fchan->vchan.chan.chan_id);
}
static void st_fdma_ch_sta_update(struct st_fdma_chan *fchan,
unsigned long int_sta)
{
unsigned long ch_sta, ch_err;
int ch_id = fchan->vchan.chan.chan_id;
struct st_fdma_dev *fdev = fchan->fdev;
ch_sta = fchan_read(fchan, FDMA_CH_CMD_OFST);
ch_err = ch_sta & FDMA_CH_CMD_ERR_MASK;
ch_sta &= FDMA_CH_CMD_STA_MASK;
if (int_sta & FDMA_INT_STA_ERR) {
dev_warn(fdev->dev, "chan:%d, error:%ld\n", ch_id, ch_err);
fchan->status = DMA_ERROR;
return;
}
switch (ch_sta) {
case FDMA_CH_CMD_STA_PAUSED:
fchan->status = DMA_PAUSED;
break;
case FDMA_CH_CMD_STA_RUNNING:
fchan->status = DMA_IN_PROGRESS;
break;
}
}
static irqreturn_t st_fdma_irq_handler(int irq, void *dev_id)
{
struct st_fdma_dev *fdev = dev_id;
irqreturn_t ret = IRQ_NONE;
struct st_fdma_chan *fchan = &fdev->chans[0];
unsigned long int_sta, clr;
int_sta = fdma_read(fdev, FDMA_INT_STA_OFST);
clr = int_sta;
for (; int_sta != 0 ; int_sta >>= 2, fchan++) {
if (!(int_sta & (FDMA_INT_STA_CH | FDMA_INT_STA_ERR)))
continue;
spin_lock(&fchan->vchan.lock);
st_fdma_ch_sta_update(fchan, int_sta);
if (fchan->fdesc) {
if (!fchan->fdesc->iscyclic) {
list_del(&fchan->fdesc->vdesc.node);
vchan_cookie_complete(&fchan->fdesc->vdesc);
fchan->fdesc = NULL;
fchan->status = DMA_COMPLETE;
} else {
vchan_cyclic_callback(&fchan->fdesc->vdesc);
}
/* Start the next descriptor (if available) */
if (!fchan->fdesc)
st_fdma_xfer_desc(fchan);
}
spin_unlock(&fchan->vchan.lock);
ret = IRQ_HANDLED;
}
fdma_write(fdev, clr, FDMA_INT_CLR_OFST);
return ret;
}
static struct dma_chan *st_fdma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct st_fdma_dev *fdev = ofdma->of_dma_data;
struct dma_chan *chan;
struct st_fdma_chan *fchan;
int ret;
if (dma_spec->args_count < 1)
return ERR_PTR(-EINVAL);
if (fdev->dma_device.dev->of_node != dma_spec->np)
return ERR_PTR(-EINVAL);
ret = rproc_boot(fdev->slim_rproc->rproc);
if (ret == -ENOENT)
return ERR_PTR(-EPROBE_DEFER);
else if (ret)
return ERR_PTR(ret);
chan = dma_get_any_slave_channel(&fdev->dma_device);
if (!chan)
goto err_chan;
fchan = to_st_fdma_chan(chan);
fchan->cfg.of_node = dma_spec->np;
fchan->cfg.req_line = dma_spec->args[0];
fchan->cfg.req_ctrl = 0;
fchan->cfg.type = ST_FDMA_TYPE_FREE_RUN;
if (dma_spec->args_count > 1)
fchan->cfg.req_ctrl = dma_spec->args[1]
& FDMA_REQ_CTRL_CFG_MASK;
if (dma_spec->args_count > 2)
fchan->cfg.type = dma_spec->args[2];
if (fchan->cfg.type == ST_FDMA_TYPE_FREE_RUN) {
fchan->dreq_line = 0;
} else {
fchan->dreq_line = st_fdma_dreq_get(fchan);
if (IS_ERR_VALUE(fchan->dreq_line)) {
chan = ERR_PTR(fchan->dreq_line);
goto err_chan;
}
}
dev_dbg(fdev->dev, "xlate req_line:%d type:%d req_ctrl:%#lx\n",
fchan->cfg.req_line, fchan->cfg.type, fchan->cfg.req_ctrl);
return chan;
err_chan:
rproc_shutdown(fdev->slim_rproc->rproc);
return chan;
}
static void st_fdma_free_desc(struct virt_dma_desc *vdesc)
{
struct st_fdma_desc *fdesc;
int i;
fdesc = to_st_fdma_desc(vdesc);
for (i = 0; i < fdesc->n_nodes; i++)
dma_pool_free(fdesc->fchan->node_pool, fdesc->node[i].desc,
fdesc->node[i].pdesc);
kfree(fdesc);
}
static struct st_fdma_desc *st_fdma_alloc_desc(struct st_fdma_chan *fchan,
int sg_len)
{
struct st_fdma_desc *fdesc;
int i;
fdesc = kzalloc(struct_size(fdesc, node, sg_len), GFP_NOWAIT);
if (!fdesc)
return NULL;
fdesc->fchan = fchan;
fdesc->n_nodes = sg_len;
for (i = 0; i < sg_len; i++) {
fdesc->node[i].desc = dma_pool_alloc(fchan->node_pool,
GFP_NOWAIT, &fdesc->node[i].pdesc);
if (!fdesc->node[i].desc)
goto err;
}
return fdesc;
err:
while (--i >= 0)
dma_pool_free(fchan->node_pool, fdesc->node[i].desc,
fdesc->node[i].pdesc);
kfree(fdesc);
return NULL;
}
static int st_fdma_alloc_chan_res(struct dma_chan *chan)
{
struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
/* Create the dma pool for descriptor allocation */
fchan->node_pool = dma_pool_create(dev_name(&chan->dev->device),
fchan->fdev->dev,
sizeof(struct st_fdma_hw_node),
__alignof__(struct st_fdma_hw_node),
0);
if (!fchan->node_pool) {
dev_err(fchan->fdev->dev, "unable to allocate desc pool\n");
return -ENOMEM;
}
dev_dbg(fchan->fdev->dev, "alloc ch_id:%d type:%d\n",
fchan->vchan.chan.chan_id, fchan->cfg.type);
return 0;
}
static void st_fdma_free_chan_res(struct dma_chan *chan)
{
struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
struct rproc *rproc = fchan->fdev->slim_rproc->rproc;
unsigned long flags;
dev_dbg(fchan->fdev->dev, "%s: freeing chan:%d\n",
__func__, fchan->vchan.chan.chan_id);
if (fchan->cfg.type != ST_FDMA_TYPE_FREE_RUN)
st_fdma_dreq_put(fchan);
spin_lock_irqsave(&fchan->vchan.lock, flags);
fchan->fdesc = NULL;
spin_unlock_irqrestore(&fchan->vchan.lock, flags);
dma_pool_destroy(fchan->node_pool);
fchan->node_pool = NULL;
memset(&fchan->cfg, 0, sizeof(struct st_fdma_cfg));
rproc_shutdown(rproc);
}
static struct dma_async_tx_descriptor *st_fdma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct st_fdma_chan *fchan;
struct st_fdma_desc *fdesc;
struct st_fdma_hw_node *hw_node;
if (!len)
return NULL;
fchan = to_st_fdma_chan(chan);
/* We only require a single descriptor */
fdesc = st_fdma_alloc_desc(fchan, 1);
if (!fdesc) {
dev_err(fchan->fdev->dev, "no memory for desc\n");
return NULL;
}
hw_node = fdesc->node[0].desc;
hw_node->next = 0;
hw_node->control = FDMA_NODE_CTRL_REQ_MAP_FREE_RUN;
hw_node->control |= FDMA_NODE_CTRL_SRC_INCR;
hw_node->control |= FDMA_NODE_CTRL_DST_INCR;
hw_node->control |= FDMA_NODE_CTRL_INT_EON;
hw_node->nbytes = len;
hw_node->saddr = src;
hw_node->daddr = dst;
hw_node->generic.length = len;
hw_node->generic.sstride = 0;
hw_node->generic.dstride = 0;
return vchan_tx_prep(&fchan->vchan, &fdesc->vdesc, flags);
}
static int config_reqctrl(struct st_fdma_chan *fchan,
enum dma_transfer_direction direction)
{
u32 maxburst = 0, addr = 0;
enum dma_slave_buswidth width;
int ch_id = fchan->vchan.chan.chan_id;
struct st_fdma_dev *fdev = fchan->fdev;
switch (direction) {
case DMA_DEV_TO_MEM:
fchan->cfg.req_ctrl &= ~FDMA_REQ_CTRL_WNR;
maxburst = fchan->scfg.src_maxburst;
width = fchan->scfg.src_addr_width;
addr = fchan->scfg.src_addr;
break;
case DMA_MEM_TO_DEV:
fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_WNR;
maxburst = fchan->scfg.dst_maxburst;
width = fchan->scfg.dst_addr_width;
addr = fchan->scfg.dst_addr;
break;
default:
return -EINVAL;
}
fchan->cfg.req_ctrl &= ~FDMA_REQ_CTRL_OPCODE_MASK;
switch (width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_OPCODE_LD_ST1;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_OPCODE_LD_ST2;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_OPCODE_LD_ST4;
break;
case DMA_SLAVE_BUSWIDTH_8_BYTES:
fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_OPCODE_LD_ST8;
break;
default:
return -EINVAL;
}
fchan->cfg.req_ctrl &= ~FDMA_REQ_CTRL_NUM_OPS_MASK;
fchan->cfg.req_ctrl |= FDMA_REQ_CTRL_NUM_OPS(maxburst-1);
dreq_write(fchan, fchan->cfg.req_ctrl, FDMA_REQ_CTRL_OFST);
fchan->cfg.dev_addr = addr;
fchan->cfg.dir = direction;
dev_dbg(fdev->dev, "chan:%d config_reqctrl:%#x req_ctrl:%#lx\n",
ch_id, addr, fchan->cfg.req_ctrl);
return 0;
}
static void fill_hw_node(struct st_fdma_hw_node *hw_node,
struct st_fdma_chan *fchan,
enum dma_transfer_direction direction)
{
if (direction == DMA_MEM_TO_DEV) {
hw_node->control |= FDMA_NODE_CTRL_SRC_INCR;
hw_node->control |= FDMA_NODE_CTRL_DST_STATIC;
hw_node->daddr = fchan->cfg.dev_addr;
} else {
hw_node->control |= FDMA_NODE_CTRL_SRC_STATIC;
hw_node->control |= FDMA_NODE_CTRL_DST_INCR;
hw_node->saddr = fchan->cfg.dev_addr;
}
hw_node->generic.sstride = 0;
hw_node->generic.dstride = 0;
}
static inline struct st_fdma_chan *st_fdma_prep_common(struct dma_chan *chan,
size_t len, enum dma_transfer_direction direction)
{
struct st_fdma_chan *fchan;
if (!chan || !len)
return NULL;
fchan = to_st_fdma_chan(chan);
if (!is_slave_direction(direction)) {
dev_err(fchan->fdev->dev, "bad direction?\n");
return NULL;
}
return fchan;
}
static struct dma_async_tx_descriptor *st_fdma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct st_fdma_chan *fchan;
struct st_fdma_desc *fdesc;
int sg_len, i;
fchan = st_fdma_prep_common(chan, len, direction);
if (!fchan)
return NULL;
if (!period_len)
return NULL;
if (config_reqctrl(fchan, direction)) {
dev_err(fchan->fdev->dev, "bad width or direction\n");
return NULL;
}
/* the buffer length must be a multiple of period_len */
if (len % period_len != 0) {
dev_err(fchan->fdev->dev, "len is not multiple of period\n");
return NULL;
}
sg_len = len / period_len;
fdesc = st_fdma_alloc_desc(fchan, sg_len);
if (!fdesc) {
dev_err(fchan->fdev->dev, "no memory for desc\n");
return NULL;
}
fdesc->iscyclic = true;
for (i = 0; i < sg_len; i++) {
struct st_fdma_hw_node *hw_node = fdesc->node[i].desc;
hw_node->next = fdesc->node[(i + 1) % sg_len].pdesc;
hw_node->control =
FDMA_NODE_CTRL_REQ_MAP_DREQ(fchan->dreq_line);
hw_node->control |= FDMA_NODE_CTRL_INT_EON;
fill_hw_node(hw_node, fchan, direction);
if (direction == DMA_MEM_TO_DEV)
hw_node->saddr = buf_addr + (i * period_len);
else
hw_node->daddr = buf_addr + (i * period_len);
hw_node->nbytes = period_len;
hw_node->generic.length = period_len;
}
return vchan_tx_prep(&fchan->vchan, &fdesc->vdesc, flags);
}
static struct dma_async_tx_descriptor *st_fdma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct st_fdma_chan *fchan;
struct st_fdma_desc *fdesc;
struct st_fdma_hw_node *hw_node;
struct scatterlist *sg;
int i;
fchan = st_fdma_prep_common(chan, sg_len, direction);
if (!fchan)
return NULL;
if (!sgl)
return NULL;
fdesc = st_fdma_alloc_desc(fchan, sg_len);
if (!fdesc) {
dev_err(fchan->fdev->dev, "no memory for desc\n");
return NULL;
}
fdesc->iscyclic = false;
for_each_sg(sgl, sg, sg_len, i) {
hw_node = fdesc->node[i].desc;
hw_node->next = fdesc->node[(i + 1) % sg_len].pdesc;
hw_node->control = FDMA_NODE_CTRL_REQ_MAP_DREQ(fchan->dreq_line);
fill_hw_node(hw_node, fchan, direction);
if (direction == DMA_MEM_TO_DEV)
hw_node->saddr = sg_dma_address(sg);
else
hw_node->daddr = sg_dma_address(sg);
hw_node->nbytes = sg_dma_len(sg);
hw_node->generic.length = sg_dma_len(sg);
}
/* interrupt at end of last node */
hw_node->control |= FDMA_NODE_CTRL_INT_EON;
return vchan_tx_prep(&fchan->vchan, &fdesc->vdesc, flags);
}
static size_t st_fdma_desc_residue(struct st_fdma_chan *fchan,
struct virt_dma_desc *vdesc,
bool in_progress)
{
struct st_fdma_desc *fdesc = fchan->fdesc;
size_t residue = 0;
dma_addr_t cur_addr = 0;
int i;
if (in_progress) {
cur_addr = fchan_read(fchan, FDMA_CH_CMD_OFST);
cur_addr &= FDMA_CH_CMD_DATA_MASK;
}
for (i = fchan->fdesc->n_nodes - 1 ; i >= 0; i--) {
if (cur_addr == fdesc->node[i].pdesc) {
residue += fnode_read(fchan, FDMA_CNTN_OFST);
break;
}
residue += fdesc->node[i].desc->nbytes;
}
return residue;
}
static enum dma_status st_fdma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
struct virt_dma_desc *vd;
enum dma_status ret;
unsigned long flags;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&fchan->vchan.lock, flags);
vd = vchan_find_desc(&fchan->vchan, cookie);
if (fchan->fdesc && cookie == fchan->fdesc->vdesc.tx.cookie)
txstate->residue = st_fdma_desc_residue(fchan, vd, true);
else if (vd)
txstate->residue = st_fdma_desc_residue(fchan, vd, false);
else
txstate->residue = 0;
spin_unlock_irqrestore(&fchan->vchan.lock, flags);
return ret;
}
static void st_fdma_issue_pending(struct dma_chan *chan)
{
struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&fchan->vchan.lock, flags);
if (vchan_issue_pending(&fchan->vchan) && !fchan->fdesc)
st_fdma_xfer_desc(fchan);
spin_unlock_irqrestore(&fchan->vchan.lock, flags);
}
static int st_fdma_pause(struct dma_chan *chan)
{
unsigned long flags;
struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
int ch_id = fchan->vchan.chan.chan_id;
unsigned long cmd = FDMA_CMD_PAUSE(ch_id);
dev_dbg(fchan->fdev->dev, "pause chan:%d\n", ch_id);
spin_lock_irqsave(&fchan->vchan.lock, flags);
if (fchan->fdesc)
fdma_write(fchan->fdev, cmd, FDMA_CMD_SET_OFST);
spin_unlock_irqrestore(&fchan->vchan.lock, flags);
return 0;
}
static int st_fdma_resume(struct dma_chan *chan)
{
unsigned long flags;
unsigned long val;
struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
int ch_id = fchan->vchan.chan.chan_id;
dev_dbg(fchan->fdev->dev, "resume chan:%d\n", ch_id);
spin_lock_irqsave(&fchan->vchan.lock, flags);
if (fchan->fdesc) {
val = fchan_read(fchan, FDMA_CH_CMD_OFST);
val &= FDMA_CH_CMD_DATA_MASK;
fchan_write(fchan, val, FDMA_CH_CMD_OFST);
}
spin_unlock_irqrestore(&fchan->vchan.lock, flags);
return 0;
}
static int st_fdma_terminate_all(struct dma_chan *chan)
{
unsigned long flags;
LIST_HEAD(head);
struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
int ch_id = fchan->vchan.chan.chan_id;
unsigned long cmd = FDMA_CMD_PAUSE(ch_id);
dev_dbg(fchan->fdev->dev, "terminate chan:%d\n", ch_id);
spin_lock_irqsave(&fchan->vchan.lock, flags);
fdma_write(fchan->fdev, cmd, FDMA_CMD_SET_OFST);
fchan->fdesc = NULL;
vchan_get_all_descriptors(&fchan->vchan, &head);
spin_unlock_irqrestore(&fchan->vchan.lock, flags);
vchan_dma_desc_free_list(&fchan->vchan, &head);
return 0;
}
static int st_fdma_slave_config(struct dma_chan *chan,
struct dma_slave_config *slave_cfg)
{
struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
memcpy(&fchan->scfg, slave_cfg, sizeof(fchan->scfg));
return 0;
}
static const struct st_fdma_driverdata fdma_mpe31_stih407_11 = {
.name = "STiH407",
.id = 0,
};
static const struct st_fdma_driverdata fdma_mpe31_stih407_12 = {
.name = "STiH407",
.id = 1,
};
static const struct st_fdma_driverdata fdma_mpe31_stih407_13 = {
.name = "STiH407",
.id = 2,
};
static const struct of_device_id st_fdma_match[] = {
{ .compatible = "st,stih407-fdma-mpe31-11"
, .data = &fdma_mpe31_stih407_11 },
{ .compatible = "st,stih407-fdma-mpe31-12"
, .data = &fdma_mpe31_stih407_12 },
{ .compatible = "st,stih407-fdma-mpe31-13"
, .data = &fdma_mpe31_stih407_13 },
{},
};
MODULE_DEVICE_TABLE(of, st_fdma_match);
static int st_fdma_parse_dt(struct platform_device *pdev,
const struct st_fdma_driverdata *drvdata,
struct st_fdma_dev *fdev)
{
snprintf(fdev->fw_name, FW_NAME_SIZE, "fdma_%s_%d.elf",
drvdata->name, drvdata->id);
return of_property_read_u32(pdev->dev.of_node, "dma-channels",
&fdev->nr_channels);
}
#define FDMA_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
static void st_fdma_free(struct st_fdma_dev *fdev)
{
struct st_fdma_chan *fchan;
int i;
for (i = 0; i < fdev->nr_channels; i++) {
fchan = &fdev->chans[i];
list_del(&fchan->vchan.chan.device_node);
tasklet_kill(&fchan->vchan.task);
}
}
static int st_fdma_probe(struct platform_device *pdev)
{
struct st_fdma_dev *fdev;
const struct of_device_id *match;
struct device_node *np = pdev->dev.of_node;
const struct st_fdma_driverdata *drvdata;
int ret, i;
match = of_match_device((st_fdma_match), &pdev->dev);
if (!match || !match->data) {
dev_err(&pdev->dev, "No device match found\n");
return -ENODEV;
}
drvdata = match->data;
fdev = devm_kzalloc(&pdev->dev, sizeof(*fdev), GFP_KERNEL);
if (!fdev)
return -ENOMEM;
ret = st_fdma_parse_dt(pdev, drvdata, fdev);
if (ret) {
dev_err(&pdev->dev, "unable to find platform data\n");
goto err;
}
fdev->chans = devm_kcalloc(&pdev->dev, fdev->nr_channels,
sizeof(struct st_fdma_chan), GFP_KERNEL);
if (!fdev->chans)
return -ENOMEM;
fdev->dev = &pdev->dev;
fdev->drvdata = drvdata;
platform_set_drvdata(pdev, fdev);
fdev->irq = platform_get_irq(pdev, 0);
if (fdev->irq < 0)
return -EINVAL;
ret = devm_request_irq(&pdev->dev, fdev->irq, st_fdma_irq_handler, 0,
dev_name(&pdev->dev), fdev);
if (ret) {
dev_err(&pdev->dev, "Failed to request irq (%d)\n", ret);
goto err;
}
fdev->slim_rproc = st_slim_rproc_alloc(pdev, fdev->fw_name);
if (IS_ERR(fdev->slim_rproc)) {
ret = PTR_ERR(fdev->slim_rproc);
dev_err(&pdev->dev, "slim_rproc_alloc failed (%d)\n", ret);
goto err;
}
/* Initialise list of FDMA channels */
INIT_LIST_HEAD(&fdev->dma_device.channels);
for (i = 0; i < fdev->nr_channels; i++) {
struct st_fdma_chan *fchan = &fdev->chans[i];
fchan->fdev = fdev;
fchan->vchan.desc_free = st_fdma_free_desc;
vchan_init(&fchan->vchan, &fdev->dma_device);
}
/* Initialise the FDMA dreq (reserve 0 & 31 for FDMA use) */
fdev->dreq_mask = BIT(0) | BIT(31);
dma_cap_set(DMA_SLAVE, fdev->dma_device.cap_mask);
dma_cap_set(DMA_CYCLIC, fdev->dma_device.cap_mask);
dma_cap_set(DMA_MEMCPY, fdev->dma_device.cap_mask);
fdev->dma_device.dev = &pdev->dev;
fdev->dma_device.device_alloc_chan_resources = st_fdma_alloc_chan_res;
fdev->dma_device.device_free_chan_resources = st_fdma_free_chan_res;
fdev->dma_device.device_prep_dma_cyclic = st_fdma_prep_dma_cyclic;
fdev->dma_device.device_prep_slave_sg = st_fdma_prep_slave_sg;
fdev->dma_device.device_prep_dma_memcpy = st_fdma_prep_dma_memcpy;
fdev->dma_device.device_tx_status = st_fdma_tx_status;
fdev->dma_device.device_issue_pending = st_fdma_issue_pending;
fdev->dma_device.device_terminate_all = st_fdma_terminate_all;
fdev->dma_device.device_config = st_fdma_slave_config;
fdev->dma_device.device_pause = st_fdma_pause;
fdev->dma_device.device_resume = st_fdma_resume;
fdev->dma_device.src_addr_widths = FDMA_DMA_BUSWIDTHS;
fdev->dma_device.dst_addr_widths = FDMA_DMA_BUSWIDTHS;
fdev->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
fdev->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
ret = dmaenginem_async_device_register(&fdev->dma_device);
if (ret) {
dev_err(&pdev->dev,
"Failed to register DMA device (%d)\n", ret);
goto err_rproc;
}
ret = of_dma_controller_register(np, st_fdma_of_xlate, fdev);
if (ret) {
dev_err(&pdev->dev,
"Failed to register controller (%d)\n", ret);
goto err_rproc;
}
dev_info(&pdev->dev, "ST FDMA engine driver, irq:%d\n", fdev->irq);
return 0;
err_rproc:
st_fdma_free(fdev);
st_slim_rproc_put(fdev->slim_rproc);
err:
return ret;
}
static int st_fdma_remove(struct platform_device *pdev)
{
struct st_fdma_dev *fdev = platform_get_drvdata(pdev);
devm_free_irq(&pdev->dev, fdev->irq, fdev);
st_slim_rproc_put(fdev->slim_rproc);
of_dma_controller_free(pdev->dev.of_node);
return 0;
}
static struct platform_driver st_fdma_platform_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = st_fdma_match,
},
.probe = st_fdma_probe,
.remove = st_fdma_remove,
};
module_platform_driver(st_fdma_platform_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("STMicroelectronics FDMA engine driver");
MODULE_AUTHOR("Ludovic.barre <[email protected]>");
MODULE_AUTHOR("Peter Griffin <[email protected]>");
MODULE_ALIAS("platform:" DRIVER_NAME);
| linux-master | drivers/dma/st_fdma.c |
// SPDX-License-Identifier: GPL-2.0+
/*
* BCM2835 DMA engine support
*
* Author: Florian Meier <[email protected]>
* Copyright 2013
*
* Based on
* OMAP DMAengine support by Russell King
*
* BCM2708 DMA Driver
* Copyright (C) 2010 Broadcom
*
* Raspberry Pi PCM I2S ALSA Driver
* Copyright (c) by Phil Poole 2013
*
* MARVELL MMP Peripheral DMA Driver
* Copyright 2012 Marvell International Ltd.
*/
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include "virt-dma.h"
#define BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED 14
#define BCM2835_DMA_CHAN_NAME_SIZE 8
/**
* struct bcm2835_dmadev - BCM2835 DMA controller
* @ddev: DMA device
* @base: base address of register map
* @zero_page: bus address of zero page (to detect transactions copying from
* zero page and avoid accessing memory if so)
*/
struct bcm2835_dmadev {
struct dma_device ddev;
void __iomem *base;
dma_addr_t zero_page;
};
struct bcm2835_dma_cb {
uint32_t info;
uint32_t src;
uint32_t dst;
uint32_t length;
uint32_t stride;
uint32_t next;
uint32_t pad[2];
};
struct bcm2835_cb_entry {
struct bcm2835_dma_cb *cb;
dma_addr_t paddr;
};
struct bcm2835_chan {
struct virt_dma_chan vc;
struct dma_slave_config cfg;
unsigned int dreq;
int ch;
struct bcm2835_desc *desc;
struct dma_pool *cb_pool;
void __iomem *chan_base;
int irq_number;
unsigned int irq_flags;
bool is_lite_channel;
};
struct bcm2835_desc {
struct bcm2835_chan *c;
struct virt_dma_desc vd;
enum dma_transfer_direction dir;
unsigned int frames;
size_t size;
bool cyclic;
struct bcm2835_cb_entry cb_list[];
};
#define BCM2835_DMA_CS 0x00
#define BCM2835_DMA_ADDR 0x04
#define BCM2835_DMA_TI 0x08
#define BCM2835_DMA_SOURCE_AD 0x0c
#define BCM2835_DMA_DEST_AD 0x10
#define BCM2835_DMA_LEN 0x14
#define BCM2835_DMA_STRIDE 0x18
#define BCM2835_DMA_NEXTCB 0x1c
#define BCM2835_DMA_DEBUG 0x20
/* DMA CS Control and Status bits */
#define BCM2835_DMA_ACTIVE BIT(0) /* activate the DMA */
#define BCM2835_DMA_END BIT(1) /* current CB has ended */
#define BCM2835_DMA_INT BIT(2) /* interrupt status */
#define BCM2835_DMA_DREQ BIT(3) /* DREQ state */
#define BCM2835_DMA_ISPAUSED BIT(4) /* Pause requested or not active */
#define BCM2835_DMA_ISHELD BIT(5) /* Is held by DREQ flow control */
#define BCM2835_DMA_WAITING_FOR_WRITES BIT(6) /* waiting for last
* AXI-write to ack
*/
#define BCM2835_DMA_ERR BIT(8)
#define BCM2835_DMA_PRIORITY(x) ((x & 15) << 16) /* AXI priority */
#define BCM2835_DMA_PANIC_PRIORITY(x) ((x & 15) << 20) /* panic priority */
/* current value of TI.BCM2835_DMA_WAIT_RESP */
#define BCM2835_DMA_WAIT_FOR_WRITES BIT(28)
#define BCM2835_DMA_DIS_DEBUG BIT(29) /* disable debug pause signal */
#define BCM2835_DMA_ABORT BIT(30) /* Stop current CB, go to next, WO */
#define BCM2835_DMA_RESET BIT(31) /* WO, self clearing */
/* Transfer information bits - also bcm2835_cb.info field */
#define BCM2835_DMA_INT_EN BIT(0)
#define BCM2835_DMA_TDMODE BIT(1) /* 2D-Mode */
#define BCM2835_DMA_WAIT_RESP BIT(3) /* wait for AXI-write to be acked */
#define BCM2835_DMA_D_INC BIT(4)
#define BCM2835_DMA_D_WIDTH BIT(5) /* 128bit writes if set */
#define BCM2835_DMA_D_DREQ BIT(6) /* enable DREQ for destination */
#define BCM2835_DMA_D_IGNORE BIT(7) /* ignore destination writes */
#define BCM2835_DMA_S_INC BIT(8)
#define BCM2835_DMA_S_WIDTH BIT(9) /* 128bit writes if set */
#define BCM2835_DMA_S_DREQ BIT(10) /* enable SREQ for source */
#define BCM2835_DMA_S_IGNORE BIT(11) /* ignore source reads - read 0 */
#define BCM2835_DMA_BURST_LENGTH(x) ((x & 15) << 12)
#define BCM2835_DMA_PER_MAP(x) ((x & 31) << 16) /* REQ source */
#define BCM2835_DMA_WAIT(x) ((x & 31) << 21) /* add DMA-wait cycles */
#define BCM2835_DMA_NO_WIDE_BURSTS BIT(26) /* no 2 beat write bursts */
/* debug register bits */
#define BCM2835_DMA_DEBUG_LAST_NOT_SET_ERR BIT(0)
#define BCM2835_DMA_DEBUG_FIFO_ERR BIT(1)
#define BCM2835_DMA_DEBUG_READ_ERR BIT(2)
#define BCM2835_DMA_DEBUG_OUTSTANDING_WRITES_SHIFT 4
#define BCM2835_DMA_DEBUG_OUTSTANDING_WRITES_BITS 4
#define BCM2835_DMA_DEBUG_ID_SHIFT 16
#define BCM2835_DMA_DEBUG_ID_BITS 9
#define BCM2835_DMA_DEBUG_STATE_SHIFT 16
#define BCM2835_DMA_DEBUG_STATE_BITS 9
#define BCM2835_DMA_DEBUG_VERSION_SHIFT 25
#define BCM2835_DMA_DEBUG_VERSION_BITS 3
#define BCM2835_DMA_DEBUG_LITE BIT(28)
/* shared registers for all dma channels */
#define BCM2835_DMA_INT_STATUS 0xfe0
#define BCM2835_DMA_ENABLE 0xff0
#define BCM2835_DMA_DATA_TYPE_S8 1
#define BCM2835_DMA_DATA_TYPE_S16 2
#define BCM2835_DMA_DATA_TYPE_S32 4
#define BCM2835_DMA_DATA_TYPE_S128 16
/* Valid only for channels 0 - 14, 15 has its own base address */
#define BCM2835_DMA_CHAN(n) ((n) << 8) /* Base address */
#define BCM2835_DMA_CHANIO(base, n) ((base) + BCM2835_DMA_CHAN(n))
/* the max dma length for different channels */
#define MAX_DMA_LEN SZ_1G
#define MAX_LITE_DMA_LEN (SZ_64K - 4)
static inline size_t bcm2835_dma_max_frame_length(struct bcm2835_chan *c)
{
/* lite and normal channels have different max frame length */
return c->is_lite_channel ? MAX_LITE_DMA_LEN : MAX_DMA_LEN;
}
/* how many frames of max_len size do we need to transfer len bytes */
static inline size_t bcm2835_dma_frames_for_length(size_t len,
size_t max_len)
{
return DIV_ROUND_UP(len, max_len);
}
static inline struct bcm2835_dmadev *to_bcm2835_dma_dev(struct dma_device *d)
{
return container_of(d, struct bcm2835_dmadev, ddev);
}
static inline struct bcm2835_chan *to_bcm2835_dma_chan(struct dma_chan *c)
{
return container_of(c, struct bcm2835_chan, vc.chan);
}
static inline struct bcm2835_desc *to_bcm2835_dma_desc(
struct dma_async_tx_descriptor *t)
{
return container_of(t, struct bcm2835_desc, vd.tx);
}
static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc)
{
size_t i;
for (i = 0; i < desc->frames; i++)
dma_pool_free(desc->c->cb_pool, desc->cb_list[i].cb,
desc->cb_list[i].paddr);
kfree(desc);
}
static void bcm2835_dma_desc_free(struct virt_dma_desc *vd)
{
bcm2835_dma_free_cb_chain(
container_of(vd, struct bcm2835_desc, vd));
}
static void bcm2835_dma_create_cb_set_length(
struct bcm2835_chan *chan,
struct bcm2835_dma_cb *control_block,
size_t len,
size_t period_len,
size_t *total_len,
u32 finalextrainfo)
{
size_t max_len = bcm2835_dma_max_frame_length(chan);
/* set the length taking lite-channel limitations into account */
control_block->length = min_t(u32, len, max_len);
/* finished if we have no period_length */
if (!period_len)
return;
/*
* period_len means: that we need to generate
* transfers that are terminating at every
* multiple of period_len - this is typically
* used to set the interrupt flag in info
* which is required during cyclic transfers
*/
/* have we filled in period_length yet? */
if (*total_len + control_block->length < period_len) {
/* update number of bytes in this period so far */
*total_len += control_block->length;
return;
}
/* calculate the length that remains to reach period_length */
control_block->length = period_len - *total_len;
/* reset total_length for next period */
*total_len = 0;
/* add extrainfo bits in info */
control_block->info |= finalextrainfo;
}
static inline size_t bcm2835_dma_count_frames_for_sg(
struct bcm2835_chan *c,
struct scatterlist *sgl,
unsigned int sg_len)
{
size_t frames = 0;
struct scatterlist *sgent;
unsigned int i;
size_t plength = bcm2835_dma_max_frame_length(c);
for_each_sg(sgl, sgent, sg_len, i)
frames += bcm2835_dma_frames_for_length(
sg_dma_len(sgent), plength);
return frames;
}
/**
* bcm2835_dma_create_cb_chain - create a control block and fills data in
*
* @chan: the @dma_chan for which we run this
* @direction: the direction in which we transfer
* @cyclic: it is a cyclic transfer
* @info: the default info bits to apply per controlblock
* @frames: number of controlblocks to allocate
* @src: the src address to assign (if the S_INC bit is set
* in @info, then it gets incremented)
* @dst: the dst address to assign (if the D_INC bit is set
* in @info, then it gets incremented)
* @buf_len: the full buffer length (may also be 0)
* @period_len: the period length when to apply @finalextrainfo
* in addition to the last transfer
* this will also break some control-blocks early
* @finalextrainfo: additional bits in last controlblock
* (or when period_len is reached in case of cyclic)
* @gfp: the GFP flag to use for allocation
*/
static struct bcm2835_desc *bcm2835_dma_create_cb_chain(
struct dma_chan *chan, enum dma_transfer_direction direction,
bool cyclic, u32 info, u32 finalextrainfo, size_t frames,
dma_addr_t src, dma_addr_t dst, size_t buf_len,
size_t period_len, gfp_t gfp)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
size_t len = buf_len, total_len;
size_t frame;
struct bcm2835_desc *d;
struct bcm2835_cb_entry *cb_entry;
struct bcm2835_dma_cb *control_block;
if (!frames)
return NULL;
/* allocate and setup the descriptor. */
d = kzalloc(struct_size(d, cb_list, frames), gfp);
if (!d)
return NULL;
d->c = c;
d->dir = direction;
d->cyclic = cyclic;
/*
* Iterate over all frames, create a control block
* for each frame and link them together.
*/
for (frame = 0, total_len = 0; frame < frames; d->frames++, frame++) {
cb_entry = &d->cb_list[frame];
cb_entry->cb = dma_pool_alloc(c->cb_pool, gfp,
&cb_entry->paddr);
if (!cb_entry->cb)
goto error_cb;
/* fill in the control block */
control_block = cb_entry->cb;
control_block->info = info;
control_block->src = src;
control_block->dst = dst;
control_block->stride = 0;
control_block->next = 0;
/* set up length in control_block if requested */
if (buf_len) {
/* calculate length honoring period_length */
bcm2835_dma_create_cb_set_length(
c, control_block,
len, period_len, &total_len,
cyclic ? finalextrainfo : 0);
/* calculate new remaining length */
len -= control_block->length;
}
/* link this the last controlblock */
if (frame)
d->cb_list[frame - 1].cb->next = cb_entry->paddr;
/* update src and dst and length */
if (src && (info & BCM2835_DMA_S_INC))
src += control_block->length;
if (dst && (info & BCM2835_DMA_D_INC))
dst += control_block->length;
/* Length of total transfer */
d->size += control_block->length;
}
/* the last frame requires extra flags */
d->cb_list[d->frames - 1].cb->info |= finalextrainfo;
/* detect a size missmatch */
if (buf_len && (d->size != buf_len))
goto error_cb;
return d;
error_cb:
bcm2835_dma_free_cb_chain(d);
return NULL;
}
static void bcm2835_dma_fill_cb_chain_with_sg(
struct dma_chan *chan,
enum dma_transfer_direction direction,
struct bcm2835_cb_entry *cb,
struct scatterlist *sgl,
unsigned int sg_len)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
size_t len, max_len;
unsigned int i;
dma_addr_t addr;
struct scatterlist *sgent;
max_len = bcm2835_dma_max_frame_length(c);
for_each_sg(sgl, sgent, sg_len, i) {
for (addr = sg_dma_address(sgent), len = sg_dma_len(sgent);
len > 0;
addr += cb->cb->length, len -= cb->cb->length, cb++) {
if (direction == DMA_DEV_TO_MEM)
cb->cb->dst = addr;
else
cb->cb->src = addr;
cb->cb->length = min(len, max_len);
}
}
}
static void bcm2835_dma_abort(struct bcm2835_chan *c)
{
void __iomem *chan_base = c->chan_base;
long int timeout = 10000;
/*
* A zero control block address means the channel is idle.
* (The ACTIVE flag in the CS register is not a reliable indicator.)
*/
if (!readl(chan_base + BCM2835_DMA_ADDR))
return;
/* Write 0 to the active bit - Pause the DMA */
writel(0, chan_base + BCM2835_DMA_CS);
/* Wait for any current AXI transfer to complete */
while ((readl(chan_base + BCM2835_DMA_CS) &
BCM2835_DMA_WAITING_FOR_WRITES) && --timeout)
cpu_relax();
/* Peripheral might be stuck and fail to signal AXI write responses */
if (!timeout)
dev_err(c->vc.chan.device->dev,
"failed to complete outstanding writes\n");
writel(BCM2835_DMA_RESET, chan_base + BCM2835_DMA_CS);
}
static void bcm2835_dma_start_desc(struct bcm2835_chan *c)
{
struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
struct bcm2835_desc *d;
if (!vd) {
c->desc = NULL;
return;
}
list_del(&vd->node);
c->desc = d = to_bcm2835_dma_desc(&vd->tx);
writel(d->cb_list[0].paddr, c->chan_base + BCM2835_DMA_ADDR);
writel(BCM2835_DMA_ACTIVE, c->chan_base + BCM2835_DMA_CS);
}
static irqreturn_t bcm2835_dma_callback(int irq, void *data)
{
struct bcm2835_chan *c = data;
struct bcm2835_desc *d;
unsigned long flags;
/* check the shared interrupt */
if (c->irq_flags & IRQF_SHARED) {
/* check if the interrupt is enabled */
flags = readl(c->chan_base + BCM2835_DMA_CS);
/* if not set then we are not the reason for the irq */
if (!(flags & BCM2835_DMA_INT))
return IRQ_NONE;
}
spin_lock_irqsave(&c->vc.lock, flags);
/*
* Clear the INT flag to receive further interrupts. Keep the channel
* active in case the descriptor is cyclic or in case the client has
* already terminated the descriptor and issued a new one. (May happen
* if this IRQ handler is threaded.) If the channel is finished, it
* will remain idle despite the ACTIVE flag being set.
*/
writel(BCM2835_DMA_INT | BCM2835_DMA_ACTIVE,
c->chan_base + BCM2835_DMA_CS);
d = c->desc;
if (d) {
if (d->cyclic) {
/* call the cyclic callback */
vchan_cyclic_callback(&d->vd);
} else if (!readl(c->chan_base + BCM2835_DMA_ADDR)) {
vchan_cookie_complete(&c->desc->vd);
bcm2835_dma_start_desc(c);
}
}
spin_unlock_irqrestore(&c->vc.lock, flags);
return IRQ_HANDLED;
}
static int bcm2835_dma_alloc_chan_resources(struct dma_chan *chan)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
struct device *dev = c->vc.chan.device->dev;
dev_dbg(dev, "Allocating DMA channel %d\n", c->ch);
/*
* Control blocks are 256 bit in length and must start at a 256 bit
* (32 byte) aligned address (BCM2835 ARM Peripherals, sec. 4.2.1.1).
*/
c->cb_pool = dma_pool_create(dev_name(dev), dev,
sizeof(struct bcm2835_dma_cb), 32, 0);
if (!c->cb_pool) {
dev_err(dev, "unable to allocate descriptor pool\n");
return -ENOMEM;
}
return request_irq(c->irq_number, bcm2835_dma_callback,
c->irq_flags, "DMA IRQ", c);
}
static void bcm2835_dma_free_chan_resources(struct dma_chan *chan)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
vchan_free_chan_resources(&c->vc);
free_irq(c->irq_number, c);
dma_pool_destroy(c->cb_pool);
dev_dbg(c->vc.chan.device->dev, "Freeing DMA channel %u\n", c->ch);
}
static size_t bcm2835_dma_desc_size(struct bcm2835_desc *d)
{
return d->size;
}
static size_t bcm2835_dma_desc_size_pos(struct bcm2835_desc *d, dma_addr_t addr)
{
unsigned int i;
size_t size;
for (size = i = 0; i < d->frames; i++) {
struct bcm2835_dma_cb *control_block = d->cb_list[i].cb;
size_t this_size = control_block->length;
dma_addr_t dma;
if (d->dir == DMA_DEV_TO_MEM)
dma = control_block->dst;
else
dma = control_block->src;
if (size)
size += this_size;
else if (addr >= dma && addr < dma + this_size)
size += dma + this_size - addr;
}
return size;
}
static enum dma_status bcm2835_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
struct virt_dma_desc *vd;
enum dma_status ret;
unsigned long flags;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&c->vc.lock, flags);
vd = vchan_find_desc(&c->vc, cookie);
if (vd) {
txstate->residue =
bcm2835_dma_desc_size(to_bcm2835_dma_desc(&vd->tx));
} else if (c->desc && c->desc->vd.tx.cookie == cookie) {
struct bcm2835_desc *d = c->desc;
dma_addr_t pos;
if (d->dir == DMA_MEM_TO_DEV)
pos = readl(c->chan_base + BCM2835_DMA_SOURCE_AD);
else if (d->dir == DMA_DEV_TO_MEM)
pos = readl(c->chan_base + BCM2835_DMA_DEST_AD);
else
pos = 0;
txstate->residue = bcm2835_dma_desc_size_pos(d, pos);
} else {
txstate->residue = 0;
}
spin_unlock_irqrestore(&c->vc.lock, flags);
return ret;
}
static void bcm2835_dma_issue_pending(struct dma_chan *chan)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&c->vc.lock, flags);
if (vchan_issue_pending(&c->vc) && !c->desc)
bcm2835_dma_start_desc(c);
spin_unlock_irqrestore(&c->vc.lock, flags);
}
static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
size_t len, unsigned long flags)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
struct bcm2835_desc *d;
u32 info = BCM2835_DMA_D_INC | BCM2835_DMA_S_INC;
u32 extra = BCM2835_DMA_INT_EN | BCM2835_DMA_WAIT_RESP;
size_t max_len = bcm2835_dma_max_frame_length(c);
size_t frames;
/* if src, dst or len is not given return with an error */
if (!src || !dst || !len)
return NULL;
/* calculate number of frames */
frames = bcm2835_dma_frames_for_length(len, max_len);
/* allocate the CB chain - this also fills in the pointers */
d = bcm2835_dma_create_cb_chain(chan, DMA_MEM_TO_MEM, false,
info, extra, frames,
src, dst, len, 0, GFP_KERNEL);
if (!d)
return NULL;
return vchan_tx_prep(&c->vc, &d->vd, flags);
}
static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg(
struct dma_chan *chan,
struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
struct bcm2835_desc *d;
dma_addr_t src = 0, dst = 0;
u32 info = BCM2835_DMA_WAIT_RESP;
u32 extra = BCM2835_DMA_INT_EN;
size_t frames;
if (!is_slave_direction(direction)) {
dev_err(chan->device->dev,
"%s: bad direction?\n", __func__);
return NULL;
}
if (c->dreq != 0)
info |= BCM2835_DMA_PER_MAP(c->dreq);
if (direction == DMA_DEV_TO_MEM) {
if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
src = c->cfg.src_addr;
info |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC;
} else {
if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
dst = c->cfg.dst_addr;
info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC;
}
/* count frames in sg list */
frames = bcm2835_dma_count_frames_for_sg(c, sgl, sg_len);
/* allocate the CB chain */
d = bcm2835_dma_create_cb_chain(chan, direction, false,
info, extra,
frames, src, dst, 0, 0,
GFP_NOWAIT);
if (!d)
return NULL;
/* fill in frames with scatterlist pointers */
bcm2835_dma_fill_cb_chain_with_sg(chan, direction, d->cb_list,
sgl, sg_len);
return vchan_tx_prep(&c->vc, &d->vd, flags);
}
static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic(
struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct bcm2835_dmadev *od = to_bcm2835_dma_dev(chan->device);
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
struct bcm2835_desc *d;
dma_addr_t src, dst;
u32 info = BCM2835_DMA_WAIT_RESP;
u32 extra = 0;
size_t max_len = bcm2835_dma_max_frame_length(c);
size_t frames;
/* Grab configuration */
if (!is_slave_direction(direction)) {
dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
return NULL;
}
if (!buf_len) {
dev_err(chan->device->dev,
"%s: bad buffer length (= 0)\n", __func__);
return NULL;
}
if (flags & DMA_PREP_INTERRUPT)
extra |= BCM2835_DMA_INT_EN;
else
period_len = buf_len;
/*
* warn if buf_len is not a multiple of period_len - this may leed
* to unexpected latencies for interrupts and thus audiable clicks
*/
if (buf_len % period_len)
dev_warn_once(chan->device->dev,
"%s: buffer_length (%zd) is not a multiple of period_len (%zd)\n",
__func__, buf_len, period_len);
/* Setup DREQ channel */
if (c->dreq != 0)
info |= BCM2835_DMA_PER_MAP(c->dreq);
if (direction == DMA_DEV_TO_MEM) {
if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
src = c->cfg.src_addr;
dst = buf_addr;
info |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC;
} else {
if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
dst = c->cfg.dst_addr;
src = buf_addr;
info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC;
/* non-lite channels can write zeroes w/o accessing memory */
if (buf_addr == od->zero_page && !c->is_lite_channel)
info |= BCM2835_DMA_S_IGNORE;
}
/* calculate number of frames */
frames = /* number of periods */
DIV_ROUND_UP(buf_len, period_len) *
/* number of frames per period */
bcm2835_dma_frames_for_length(period_len, max_len);
/*
* allocate the CB chain
* note that we need to use GFP_NOWAIT, as the ALSA i2s dmaengine
* implementation calls prep_dma_cyclic with interrupts disabled.
*/
d = bcm2835_dma_create_cb_chain(chan, direction, true,
info, extra,
frames, src, dst, buf_len,
period_len, GFP_NOWAIT);
if (!d)
return NULL;
/* wrap around into a loop */
d->cb_list[d->frames - 1].cb->next = d->cb_list[0].paddr;
return vchan_tx_prep(&c->vc, &d->vd, flags);
}
static int bcm2835_dma_slave_config(struct dma_chan *chan,
struct dma_slave_config *cfg)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
c->cfg = *cfg;
return 0;
}
static int bcm2835_dma_terminate_all(struct dma_chan *chan)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&c->vc.lock, flags);
/* stop DMA activity */
if (c->desc) {
vchan_terminate_vdesc(&c->desc->vd);
c->desc = NULL;
bcm2835_dma_abort(c);
}
vchan_get_all_descriptors(&c->vc, &head);
spin_unlock_irqrestore(&c->vc.lock, flags);
vchan_dma_desc_free_list(&c->vc, &head);
return 0;
}
static void bcm2835_dma_synchronize(struct dma_chan *chan)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
vchan_synchronize(&c->vc);
}
static int bcm2835_dma_chan_init(struct bcm2835_dmadev *d, int chan_id,
int irq, unsigned int irq_flags)
{
struct bcm2835_chan *c;
c = devm_kzalloc(d->ddev.dev, sizeof(*c), GFP_KERNEL);
if (!c)
return -ENOMEM;
c->vc.desc_free = bcm2835_dma_desc_free;
vchan_init(&c->vc, &d->ddev);
c->chan_base = BCM2835_DMA_CHANIO(d->base, chan_id);
c->ch = chan_id;
c->irq_number = irq;
c->irq_flags = irq_flags;
/* check in DEBUG register if this is a LITE channel */
if (readl(c->chan_base + BCM2835_DMA_DEBUG) &
BCM2835_DMA_DEBUG_LITE)
c->is_lite_channel = true;
return 0;
}
static void bcm2835_dma_free(struct bcm2835_dmadev *od)
{
struct bcm2835_chan *c, *next;
list_for_each_entry_safe(c, next, &od->ddev.channels,
vc.chan.device_node) {
list_del(&c->vc.chan.device_node);
tasklet_kill(&c->vc.task);
}
dma_unmap_page_attrs(od->ddev.dev, od->zero_page, PAGE_SIZE,
DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
}
static const struct of_device_id bcm2835_dma_of_match[] = {
{ .compatible = "brcm,bcm2835-dma", },
{},
};
MODULE_DEVICE_TABLE(of, bcm2835_dma_of_match);
static struct dma_chan *bcm2835_dma_xlate(struct of_phandle_args *spec,
struct of_dma *ofdma)
{
struct bcm2835_dmadev *d = ofdma->of_dma_data;
struct dma_chan *chan;
chan = dma_get_any_slave_channel(&d->ddev);
if (!chan)
return NULL;
/* Set DREQ from param */
to_bcm2835_dma_chan(chan)->dreq = spec->args[0];
return chan;
}
static int bcm2835_dma_probe(struct platform_device *pdev)
{
struct bcm2835_dmadev *od;
void __iomem *base;
int rc;
int i, j;
int irq[BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED + 1];
int irq_flags;
uint32_t chans_available;
char chan_name[BCM2835_DMA_CHAN_NAME_SIZE];
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (rc) {
dev_err(&pdev->dev, "Unable to set DMA mask\n");
return rc;
}
od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
if (!od)
return -ENOMEM;
dma_set_max_seg_size(&pdev->dev, 0x3FFFFFFF);
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
od->base = base;
dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
dma_cap_set(DMA_PRIVATE, od->ddev.cap_mask);
dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask);
dma_cap_set(DMA_MEMCPY, od->ddev.cap_mask);
od->ddev.device_alloc_chan_resources = bcm2835_dma_alloc_chan_resources;
od->ddev.device_free_chan_resources = bcm2835_dma_free_chan_resources;
od->ddev.device_tx_status = bcm2835_dma_tx_status;
od->ddev.device_issue_pending = bcm2835_dma_issue_pending;
od->ddev.device_prep_dma_cyclic = bcm2835_dma_prep_dma_cyclic;
od->ddev.device_prep_slave_sg = bcm2835_dma_prep_slave_sg;
od->ddev.device_prep_dma_memcpy = bcm2835_dma_prep_dma_memcpy;
od->ddev.device_config = bcm2835_dma_slave_config;
od->ddev.device_terminate_all = bcm2835_dma_terminate_all;
od->ddev.device_synchronize = bcm2835_dma_synchronize;
od->ddev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
od->ddev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
BIT(DMA_MEM_TO_MEM);
od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
od->ddev.descriptor_reuse = true;
od->ddev.dev = &pdev->dev;
INIT_LIST_HEAD(&od->ddev.channels);
platform_set_drvdata(pdev, od);
od->zero_page = dma_map_page_attrs(od->ddev.dev, ZERO_PAGE(0), 0,
PAGE_SIZE, DMA_TO_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
if (dma_mapping_error(od->ddev.dev, od->zero_page)) {
dev_err(&pdev->dev, "Failed to map zero page\n");
return -ENOMEM;
}
/* Request DMA channel mask from device tree */
if (of_property_read_u32(pdev->dev.of_node,
"brcm,dma-channel-mask",
&chans_available)) {
dev_err(&pdev->dev, "Failed to get channel mask\n");
rc = -EINVAL;
goto err_no_dma;
}
/* get irqs for each channel that we support */
for (i = 0; i <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; i++) {
/* skip masked out channels */
if (!(chans_available & (1 << i))) {
irq[i] = -1;
continue;
}
/* get the named irq */
snprintf(chan_name, sizeof(chan_name), "dma%i", i);
irq[i] = platform_get_irq_byname(pdev, chan_name);
if (irq[i] >= 0)
continue;
/* legacy device tree case handling */
dev_warn_once(&pdev->dev,
"missing interrupt-names property in device tree - legacy interpretation is used\n");
/*
* in case of channel >= 11
* use the 11th interrupt and that is shared
*/
irq[i] = platform_get_irq(pdev, i < 11 ? i : 11);
}
/* get irqs for each channel */
for (i = 0; i <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; i++) {
/* skip channels without irq */
if (irq[i] < 0)
continue;
/* check if there are other channels that also use this irq */
irq_flags = 0;
for (j = 0; j <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; j++)
if ((i != j) && (irq[j] == irq[i])) {
irq_flags = IRQF_SHARED;
break;
}
/* initialize the channel */
rc = bcm2835_dma_chan_init(od, i, irq[i], irq_flags);
if (rc)
goto err_no_dma;
}
dev_dbg(&pdev->dev, "Initialized %i DMA channels\n", i);
/* Device-tree DMA controller registration */
rc = of_dma_controller_register(pdev->dev.of_node,
bcm2835_dma_xlate, od);
if (rc) {
dev_err(&pdev->dev, "Failed to register DMA controller\n");
goto err_no_dma;
}
rc = dma_async_device_register(&od->ddev);
if (rc) {
dev_err(&pdev->dev,
"Failed to register slave DMA engine device: %d\n", rc);
goto err_no_dma;
}
dev_dbg(&pdev->dev, "Load BCM2835 DMA engine driver\n");
return 0;
err_no_dma:
bcm2835_dma_free(od);
return rc;
}
static int bcm2835_dma_remove(struct platform_device *pdev)
{
struct bcm2835_dmadev *od = platform_get_drvdata(pdev);
dma_async_device_unregister(&od->ddev);
bcm2835_dma_free(od);
return 0;
}
static struct platform_driver bcm2835_dma_driver = {
.probe = bcm2835_dma_probe,
.remove = bcm2835_dma_remove,
.driver = {
.name = "bcm2835-dma",
.of_match_table = of_match_ptr(bcm2835_dma_of_match),
},
};
module_platform_driver(bcm2835_dma_driver);
MODULE_ALIAS("platform:bcm2835-dma");
MODULE_DESCRIPTION("BCM2835 DMA engine driver");
MODULE_AUTHOR("Florian Meier <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/bcm2835-dma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2006-2009 DENX Software Engineering.
*
* Author: Yuri Tikhonov <[email protected]>
*
* Further porting to arch/powerpc by
* Anatolij Gustschin <[email protected]>
*/
/*
* This driver supports the asynchrounous DMA copy and RAID engines available
* on the AMCC PPC440SPe Processors.
* Based on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x)
* ADMA driver written by D.Williams.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/async_tx.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/proc_fs.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <asm/dcr.h>
#include <asm/dcr-regs.h>
#include "adma.h"
#include "../dmaengine.h"
enum ppc_adma_init_code {
PPC_ADMA_INIT_OK = 0,
PPC_ADMA_INIT_MEMRES,
PPC_ADMA_INIT_MEMREG,
PPC_ADMA_INIT_ALLOC,
PPC_ADMA_INIT_COHERENT,
PPC_ADMA_INIT_CHANNEL,
PPC_ADMA_INIT_IRQ1,
PPC_ADMA_INIT_IRQ2,
PPC_ADMA_INIT_REGISTER
};
static char *ppc_adma_errors[] = {
[PPC_ADMA_INIT_OK] = "ok",
[PPC_ADMA_INIT_MEMRES] = "failed to get memory resource",
[PPC_ADMA_INIT_MEMREG] = "failed to request memory region",
[PPC_ADMA_INIT_ALLOC] = "failed to allocate memory for adev "
"structure",
[PPC_ADMA_INIT_COHERENT] = "failed to allocate coherent memory for "
"hardware descriptors",
[PPC_ADMA_INIT_CHANNEL] = "failed to allocate memory for channel",
[PPC_ADMA_INIT_IRQ1] = "failed to request first irq",
[PPC_ADMA_INIT_IRQ2] = "failed to request second irq",
[PPC_ADMA_INIT_REGISTER] = "failed to register dma async device",
};
static enum ppc_adma_init_code
ppc440spe_adma_devices[PPC440SPE_ADMA_ENGINES_NUM];
struct ppc_dma_chan_ref {
struct dma_chan *chan;
struct list_head node;
};
/* The list of channels exported by ppc440spe ADMA */
static struct list_head
ppc440spe_adma_chan_list = LIST_HEAD_INIT(ppc440spe_adma_chan_list);
/* This flag is set when want to refetch the xor chain in the interrupt
* handler
*/
static u32 do_xor_refetch;
/* Pointer to DMA0, DMA1 CP/CS FIFO */
static void *ppc440spe_dma_fifo_buf;
/* Pointers to last submitted to DMA0, DMA1 CDBs */
static struct ppc440spe_adma_desc_slot *chan_last_sub[3];
static struct ppc440spe_adma_desc_slot *chan_first_cdb[3];
/* Pointer to last linked and submitted xor CB */
static struct ppc440spe_adma_desc_slot *xor_last_linked;
static struct ppc440spe_adma_desc_slot *xor_last_submit;
/* This array is used in data-check operations for storing a pattern */
static char ppc440spe_qword[16];
static atomic_t ppc440spe_adma_err_irq_ref;
static dcr_host_t ppc440spe_mq_dcr_host;
static unsigned int ppc440spe_mq_dcr_len;
/* Since RXOR operations use the common register (MQ0_CF2H) for setting-up
* the block size in transactions, then we do not allow to activate more than
* only one RXOR transactions simultaneously. So use this var to store
* the information about is RXOR currently active (PPC440SPE_RXOR_RUN bit is
* set) or not (PPC440SPE_RXOR_RUN is clear).
*/
static unsigned long ppc440spe_rxor_state;
/* These are used in enable & check routines
*/
static u32 ppc440spe_r6_enabled;
static struct ppc440spe_adma_chan *ppc440spe_r6_tchan;
static struct completion ppc440spe_r6_test_comp;
static int ppc440spe_adma_dma2rxor_prep_src(
struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_rxor *cursor, int index,
int src_cnt, u32 addr);
static void ppc440spe_adma_dma2rxor_set_src(
struct ppc440spe_adma_desc_slot *desc,
int index, dma_addr_t addr);
static void ppc440spe_adma_dma2rxor_set_mult(
struct ppc440spe_adma_desc_slot *desc,
int index, u8 mult);
#ifdef ADMA_LL_DEBUG
#define ADMA_LL_DBG(x) ({ if (1) x; 0; })
#else
#define ADMA_LL_DBG(x) ({ if (0) x; 0; })
#endif
static void print_cb(struct ppc440spe_adma_chan *chan, void *block)
{
struct dma_cdb *cdb;
struct xor_cb *cb;
int i;
switch (chan->device->id) {
case 0:
case 1:
cdb = block;
pr_debug("CDB at %p [%d]:\n"
"\t attr 0x%02x opc 0x%02x cnt 0x%08x\n"
"\t sg1u 0x%08x sg1l 0x%08x\n"
"\t sg2u 0x%08x sg2l 0x%08x\n"
"\t sg3u 0x%08x sg3l 0x%08x\n",
cdb, chan->device->id,
cdb->attr, cdb->opc, le32_to_cpu(cdb->cnt),
le32_to_cpu(cdb->sg1u), le32_to_cpu(cdb->sg1l),
le32_to_cpu(cdb->sg2u), le32_to_cpu(cdb->sg2l),
le32_to_cpu(cdb->sg3u), le32_to_cpu(cdb->sg3l)
);
break;
case 2:
cb = block;
pr_debug("CB at %p [%d]:\n"
"\t cbc 0x%08x cbbc 0x%08x cbs 0x%08x\n"
"\t cbtah 0x%08x cbtal 0x%08x\n"
"\t cblah 0x%08x cblal 0x%08x\n",
cb, chan->device->id,
cb->cbc, cb->cbbc, cb->cbs,
cb->cbtah, cb->cbtal,
cb->cblah, cb->cblal);
for (i = 0; i < 16; i++) {
if (i && !cb->ops[i].h && !cb->ops[i].l)
continue;
pr_debug("\t ops[%2d]: h 0x%08x l 0x%08x\n",
i, cb->ops[i].h, cb->ops[i].l);
}
break;
}
}
static void print_cb_list(struct ppc440spe_adma_chan *chan,
struct ppc440spe_adma_desc_slot *iter)
{
for (; iter; iter = iter->hw_next)
print_cb(chan, iter->hw_desc);
}
static void prep_dma_xor_dbg(int id, dma_addr_t dst, dma_addr_t *src,
unsigned int src_cnt)
{
int i;
pr_debug("\n%s(%d):\nsrc: ", __func__, id);
for (i = 0; i < src_cnt; i++)
pr_debug("\t0x%016llx ", src[i]);
pr_debug("dst:\n\t0x%016llx\n", dst);
}
static void prep_dma_pq_dbg(int id, dma_addr_t *dst, dma_addr_t *src,
unsigned int src_cnt)
{
int i;
pr_debug("\n%s(%d):\nsrc: ", __func__, id);
for (i = 0; i < src_cnt; i++)
pr_debug("\t0x%016llx ", src[i]);
pr_debug("dst: ");
for (i = 0; i < 2; i++)
pr_debug("\t0x%016llx ", dst[i]);
}
static void prep_dma_pqzero_sum_dbg(int id, dma_addr_t *src,
unsigned int src_cnt,
const unsigned char *scf)
{
int i;
pr_debug("\n%s(%d):\nsrc(coef): ", __func__, id);
if (scf) {
for (i = 0; i < src_cnt; i++)
pr_debug("\t0x%016llx(0x%02x) ", src[i], scf[i]);
} else {
for (i = 0; i < src_cnt; i++)
pr_debug("\t0x%016llx(no) ", src[i]);
}
pr_debug("dst: ");
for (i = 0; i < 2; i++)
pr_debug("\t0x%016llx ", src[src_cnt + i]);
}
/******************************************************************************
* Command (Descriptor) Blocks low-level routines
******************************************************************************/
/**
* ppc440spe_desc_init_interrupt - initialize the descriptor for INTERRUPT
* pseudo operation
*/
static void ppc440spe_desc_init_interrupt(struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_adma_chan *chan)
{
struct xor_cb *p;
switch (chan->device->id) {
case PPC440SPE_XOR_ID:
p = desc->hw_desc;
memset(desc->hw_desc, 0, sizeof(struct xor_cb));
/* NOP with Command Block Complete Enable */
p->cbc = XOR_CBCR_CBCE_BIT;
break;
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
memset(desc->hw_desc, 0, sizeof(struct dma_cdb));
/* NOP with interrupt */
set_bit(PPC440SPE_DESC_INT, &desc->flags);
break;
default:
printk(KERN_ERR "Unsupported id %d in %s\n", chan->device->id,
__func__);
break;
}
}
/**
* ppc440spe_desc_init_null_xor - initialize the descriptor for NULL XOR
* pseudo operation
*/
static void ppc440spe_desc_init_null_xor(struct ppc440spe_adma_desc_slot *desc)
{
memset(desc->hw_desc, 0, sizeof(struct xor_cb));
desc->hw_next = NULL;
desc->src_cnt = 0;
desc->dst_cnt = 1;
}
/**
* ppc440spe_desc_init_xor - initialize the descriptor for XOR operation
*/
static void ppc440spe_desc_init_xor(struct ppc440spe_adma_desc_slot *desc,
int src_cnt, unsigned long flags)
{
struct xor_cb *hw_desc = desc->hw_desc;
memset(desc->hw_desc, 0, sizeof(struct xor_cb));
desc->hw_next = NULL;
desc->src_cnt = src_cnt;
desc->dst_cnt = 1;
hw_desc->cbc = XOR_CBCR_TGT_BIT | src_cnt;
if (flags & DMA_PREP_INTERRUPT)
/* Enable interrupt on completion */
hw_desc->cbc |= XOR_CBCR_CBCE_BIT;
}
/**
* ppc440spe_desc_init_dma2pq - initialize the descriptor for PQ
* operation in DMA2 controller
*/
static void ppc440spe_desc_init_dma2pq(struct ppc440spe_adma_desc_slot *desc,
int dst_cnt, int src_cnt, unsigned long flags)
{
struct xor_cb *hw_desc = desc->hw_desc;
memset(desc->hw_desc, 0, sizeof(struct xor_cb));
desc->hw_next = NULL;
desc->src_cnt = src_cnt;
desc->dst_cnt = dst_cnt;
memset(desc->reverse_flags, 0, sizeof(desc->reverse_flags));
desc->descs_per_op = 0;
hw_desc->cbc = XOR_CBCR_TGT_BIT;
if (flags & DMA_PREP_INTERRUPT)
/* Enable interrupt on completion */
hw_desc->cbc |= XOR_CBCR_CBCE_BIT;
}
#define DMA_CTRL_FLAGS_LAST DMA_PREP_FENCE
#define DMA_PREP_ZERO_P (DMA_CTRL_FLAGS_LAST << 1)
#define DMA_PREP_ZERO_Q (DMA_PREP_ZERO_P << 1)
/**
* ppc440spe_desc_init_dma01pq - initialize the descriptors for PQ operation
* with DMA0/1
*/
static void ppc440spe_desc_init_dma01pq(struct ppc440spe_adma_desc_slot *desc,
int dst_cnt, int src_cnt, unsigned long flags,
unsigned long op)
{
struct dma_cdb *hw_desc;
struct ppc440spe_adma_desc_slot *iter;
u8 dopc;
/* Common initialization of a PQ descriptors chain */
set_bits(op, &desc->flags);
desc->src_cnt = src_cnt;
desc->dst_cnt = dst_cnt;
/* WXOR MULTICAST if both P and Q are being computed
* MV_SG1_SG2 if Q only
*/
dopc = (desc->dst_cnt == DMA_DEST_MAX_NUM) ?
DMA_CDB_OPC_MULTICAST : DMA_CDB_OPC_MV_SG1_SG2;
list_for_each_entry(iter, &desc->group_list, chain_node) {
hw_desc = iter->hw_desc;
memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
if (likely(!list_is_last(&iter->chain_node,
&desc->group_list))) {
/* set 'next' pointer */
iter->hw_next = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot, chain_node);
clear_bit(PPC440SPE_DESC_INT, &iter->flags);
} else {
/* this is the last descriptor.
* this slot will be pasted from ADMA level
* each time it wants to configure parameters
* of the transaction (src, dst, ...)
*/
iter->hw_next = NULL;
if (flags & DMA_PREP_INTERRUPT)
set_bit(PPC440SPE_DESC_INT, &iter->flags);
else
clear_bit(PPC440SPE_DESC_INT, &iter->flags);
}
}
/* Set OPS depending on WXOR/RXOR type of operation */
if (!test_bit(PPC440SPE_DESC_RXOR, &desc->flags)) {
/* This is a WXOR only chain:
* - first descriptors are for zeroing destinations
* if PPC440SPE_ZERO_P/Q set;
* - descriptors remained are for GF-XOR operations.
*/
iter = list_first_entry(&desc->group_list,
struct ppc440spe_adma_desc_slot,
chain_node);
if (test_bit(PPC440SPE_ZERO_P, &desc->flags)) {
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
iter = list_first_entry(&iter->chain_node,
struct ppc440spe_adma_desc_slot,
chain_node);
}
if (test_bit(PPC440SPE_ZERO_Q, &desc->flags)) {
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
iter = list_first_entry(&iter->chain_node,
struct ppc440spe_adma_desc_slot,
chain_node);
}
list_for_each_entry_from(iter, &desc->group_list, chain_node) {
hw_desc = iter->hw_desc;
hw_desc->opc = dopc;
}
} else {
/* This is either RXOR-only or mixed RXOR/WXOR */
/* The first 1 or 2 slots in chain are always RXOR,
* if need to calculate P & Q, then there are two
* RXOR slots; if only P or only Q, then there is one
*/
iter = list_first_entry(&desc->group_list,
struct ppc440spe_adma_desc_slot,
chain_node);
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
if (desc->dst_cnt == DMA_DEST_MAX_NUM) {
iter = list_first_entry(&iter->chain_node,
struct ppc440spe_adma_desc_slot,
chain_node);
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
}
/* The remaining descs (if any) are WXORs */
if (test_bit(PPC440SPE_DESC_WXOR, &desc->flags)) {
iter = list_first_entry(&iter->chain_node,
struct ppc440spe_adma_desc_slot,
chain_node);
list_for_each_entry_from(iter, &desc->group_list,
chain_node) {
hw_desc = iter->hw_desc;
hw_desc->opc = dopc;
}
}
}
}
/**
* ppc440spe_desc_init_dma01pqzero_sum - initialize the descriptor
* for PQ_ZERO_SUM operation
*/
static void ppc440spe_desc_init_dma01pqzero_sum(
struct ppc440spe_adma_desc_slot *desc,
int dst_cnt, int src_cnt)
{
struct dma_cdb *hw_desc;
struct ppc440spe_adma_desc_slot *iter;
int i = 0;
u8 dopc = (dst_cnt == 2) ? DMA_CDB_OPC_MULTICAST :
DMA_CDB_OPC_MV_SG1_SG2;
/*
* Initialize starting from 2nd or 3rd descriptor dependent
* on dst_cnt. First one or two slots are for cloning P
* and/or Q to chan->pdest and/or chan->qdest as we have
* to preserve original P/Q.
*/
iter = list_first_entry(&desc->group_list,
struct ppc440spe_adma_desc_slot, chain_node);
iter = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot, chain_node);
if (dst_cnt > 1) {
iter = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot, chain_node);
}
/* initialize each source descriptor in chain */
list_for_each_entry_from(iter, &desc->group_list, chain_node) {
hw_desc = iter->hw_desc;
memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
iter->src_cnt = 0;
iter->dst_cnt = 0;
/* This is a ZERO_SUM operation:
* - <src_cnt> descriptors starting from 2nd or 3rd
* descriptor are for GF-XOR operations;
* - remaining <dst_cnt> descriptors are for checking the result
*/
if (i++ < src_cnt)
/* MV_SG1_SG2 if only Q is being verified
* MULTICAST if both P and Q are being verified
*/
hw_desc->opc = dopc;
else
/* DMA_CDB_OPC_DCHECK128 operation */
hw_desc->opc = DMA_CDB_OPC_DCHECK128;
if (likely(!list_is_last(&iter->chain_node,
&desc->group_list))) {
/* set 'next' pointer */
iter->hw_next = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
} else {
/* this is the last descriptor.
* this slot will be pasted from ADMA level
* each time it wants to configure parameters
* of the transaction (src, dst, ...)
*/
iter->hw_next = NULL;
/* always enable interrupt generation since we get
* the status of pqzero from the handler
*/
set_bit(PPC440SPE_DESC_INT, &iter->flags);
}
}
desc->src_cnt = src_cnt;
desc->dst_cnt = dst_cnt;
}
/**
* ppc440spe_desc_init_memcpy - initialize the descriptor for MEMCPY operation
*/
static void ppc440spe_desc_init_memcpy(struct ppc440spe_adma_desc_slot *desc,
unsigned long flags)
{
struct dma_cdb *hw_desc = desc->hw_desc;
memset(desc->hw_desc, 0, sizeof(struct dma_cdb));
desc->hw_next = NULL;
desc->src_cnt = 1;
desc->dst_cnt = 1;
if (flags & DMA_PREP_INTERRUPT)
set_bit(PPC440SPE_DESC_INT, &desc->flags);
else
clear_bit(PPC440SPE_DESC_INT, &desc->flags);
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
}
/**
* ppc440spe_desc_set_src_addr - set source address into the descriptor
*/
static void ppc440spe_desc_set_src_addr(struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_adma_chan *chan,
int src_idx, dma_addr_t addrh,
dma_addr_t addrl)
{
struct dma_cdb *dma_hw_desc;
struct xor_cb *xor_hw_desc;
phys_addr_t addr64, tmplow, tmphi;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
if (!addrh) {
addr64 = addrl;
tmphi = (addr64 >> 32);
tmplow = (addr64 & 0xFFFFFFFF);
} else {
tmphi = addrh;
tmplow = addrl;
}
dma_hw_desc = desc->hw_desc;
dma_hw_desc->sg1l = cpu_to_le32((u32)tmplow);
dma_hw_desc->sg1u |= cpu_to_le32((u32)tmphi);
break;
case PPC440SPE_XOR_ID:
xor_hw_desc = desc->hw_desc;
xor_hw_desc->ops[src_idx].l = addrl;
xor_hw_desc->ops[src_idx].h |= addrh;
break;
}
}
/**
* ppc440spe_desc_set_src_mult - set source address mult into the descriptor
*/
static void ppc440spe_desc_set_src_mult(struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_adma_chan *chan, u32 mult_index,
int sg_index, unsigned char mult_value)
{
struct dma_cdb *dma_hw_desc;
u32 *psgu;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
dma_hw_desc = desc->hw_desc;
switch (sg_index) {
/* for RXOR operations set multiplier
* into source cued address
*/
case DMA_CDB_SG_SRC:
psgu = &dma_hw_desc->sg1u;
break;
/* for WXOR operations set multiplier
* into destination cued address(es)
*/
case DMA_CDB_SG_DST1:
psgu = &dma_hw_desc->sg2u;
break;
case DMA_CDB_SG_DST2:
psgu = &dma_hw_desc->sg3u;
break;
default:
BUG();
}
*psgu |= cpu_to_le32(mult_value << mult_index);
break;
case PPC440SPE_XOR_ID:
break;
default:
BUG();
}
}
/**
* ppc440spe_desc_set_dest_addr - set destination address into the descriptor
*/
static void ppc440spe_desc_set_dest_addr(struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_adma_chan *chan,
dma_addr_t addrh, dma_addr_t addrl,
u32 dst_idx)
{
struct dma_cdb *dma_hw_desc;
struct xor_cb *xor_hw_desc;
phys_addr_t addr64, tmphi, tmplow;
u32 *psgu, *psgl;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
if (!addrh) {
addr64 = addrl;
tmphi = (addr64 >> 32);
tmplow = (addr64 & 0xFFFFFFFF);
} else {
tmphi = addrh;
tmplow = addrl;
}
dma_hw_desc = desc->hw_desc;
psgu = dst_idx ? &dma_hw_desc->sg3u : &dma_hw_desc->sg2u;
psgl = dst_idx ? &dma_hw_desc->sg3l : &dma_hw_desc->sg2l;
*psgl = cpu_to_le32((u32)tmplow);
*psgu |= cpu_to_le32((u32)tmphi);
break;
case PPC440SPE_XOR_ID:
xor_hw_desc = desc->hw_desc;
xor_hw_desc->cbtal = addrl;
xor_hw_desc->cbtah |= addrh;
break;
}
}
/**
* ppc440spe_desc_set_byte_count - set number of data bytes involved
* into the operation
*/
static void ppc440spe_desc_set_byte_count(struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_adma_chan *chan,
u32 byte_count)
{
struct dma_cdb *dma_hw_desc;
struct xor_cb *xor_hw_desc;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
dma_hw_desc = desc->hw_desc;
dma_hw_desc->cnt = cpu_to_le32(byte_count);
break;
case PPC440SPE_XOR_ID:
xor_hw_desc = desc->hw_desc;
xor_hw_desc->cbbc = byte_count;
break;
}
}
/**
* ppc440spe_desc_set_rxor_block_size - set RXOR block size
*/
static inline void ppc440spe_desc_set_rxor_block_size(u32 byte_count)
{
/* assume that byte_count is aligned on the 512-boundary;
* thus write it directly to the register (bits 23:31 are
* reserved there).
*/
dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CF2H, byte_count);
}
/**
* ppc440spe_desc_set_dcheck - set CHECK pattern
*/
static void ppc440spe_desc_set_dcheck(struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_adma_chan *chan, u8 *qword)
{
struct dma_cdb *dma_hw_desc;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
dma_hw_desc = desc->hw_desc;
iowrite32(qword[0], &dma_hw_desc->sg3l);
iowrite32(qword[4], &dma_hw_desc->sg3u);
iowrite32(qword[8], &dma_hw_desc->sg2l);
iowrite32(qword[12], &dma_hw_desc->sg2u);
break;
default:
BUG();
}
}
/**
* ppc440spe_xor_set_link - set link address in xor CB
*/
static void ppc440spe_xor_set_link(struct ppc440spe_adma_desc_slot *prev_desc,
struct ppc440spe_adma_desc_slot *next_desc)
{
struct xor_cb *xor_hw_desc = prev_desc->hw_desc;
if (unlikely(!next_desc || !(next_desc->phys))) {
printk(KERN_ERR "%s: next_desc=0x%p; next_desc->phys=0x%llx\n",
__func__, next_desc,
next_desc ? next_desc->phys : 0);
BUG();
}
xor_hw_desc->cbs = 0;
xor_hw_desc->cblal = next_desc->phys;
xor_hw_desc->cblah = 0;
xor_hw_desc->cbc |= XOR_CBCR_LNK_BIT;
}
/**
* ppc440spe_desc_set_link - set the address of descriptor following this
* descriptor in chain
*/
static void ppc440spe_desc_set_link(struct ppc440spe_adma_chan *chan,
struct ppc440spe_adma_desc_slot *prev_desc,
struct ppc440spe_adma_desc_slot *next_desc)
{
unsigned long flags;
struct ppc440spe_adma_desc_slot *tail = next_desc;
if (unlikely(!prev_desc || !next_desc ||
(prev_desc->hw_next && prev_desc->hw_next != next_desc))) {
/* If previous next is overwritten something is wrong.
* though we may refetch from append to initiate list
* processing; in this case - it's ok.
*/
printk(KERN_ERR "%s: prev_desc=0x%p; next_desc=0x%p; "
"prev->hw_next=0x%p\n", __func__, prev_desc,
next_desc, prev_desc ? prev_desc->hw_next : 0);
BUG();
}
local_irq_save(flags);
/* do s/w chaining both for DMA and XOR descriptors */
prev_desc->hw_next = next_desc;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
break;
case PPC440SPE_XOR_ID:
/* bind descriptor to the chain */
while (tail->hw_next)
tail = tail->hw_next;
xor_last_linked = tail;
if (prev_desc == xor_last_submit)
/* do not link to the last submitted CB */
break;
ppc440spe_xor_set_link(prev_desc, next_desc);
break;
}
local_irq_restore(flags);
}
/**
* ppc440spe_desc_get_link - get the address of the descriptor that
* follows this one
*/
static inline u32 ppc440spe_desc_get_link(struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_adma_chan *chan)
{
if (!desc->hw_next)
return 0;
return desc->hw_next->phys;
}
/**
* ppc440spe_desc_is_aligned - check alignment
*/
static inline int ppc440spe_desc_is_aligned(
struct ppc440spe_adma_desc_slot *desc, int num_slots)
{
return (desc->idx & (num_slots - 1)) ? 0 : 1;
}
/**
* ppc440spe_chan_xor_slot_count - get the number of slots necessary for
* XOR operation
*/
static int ppc440spe_chan_xor_slot_count(size_t len, int src_cnt,
int *slots_per_op)
{
int slot_cnt;
/* each XOR descriptor provides up to 16 source operands */
slot_cnt = *slots_per_op = (src_cnt + XOR_MAX_OPS - 1)/XOR_MAX_OPS;
if (likely(len <= PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT))
return slot_cnt;
printk(KERN_ERR "%s: len %d > max %d !!\n",
__func__, len, PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT);
BUG();
return slot_cnt;
}
/**
* ppc440spe_dma2_pq_slot_count - get the number of slots necessary for
* DMA2 PQ operation
*/
static int ppc440spe_dma2_pq_slot_count(dma_addr_t *srcs,
int src_cnt, size_t len)
{
signed long long order = 0;
int state = 0;
int addr_count = 0;
int i;
for (i = 1; i < src_cnt; i++) {
dma_addr_t cur_addr = srcs[i];
dma_addr_t old_addr = srcs[i-1];
switch (state) {
case 0:
if (cur_addr == old_addr + len) {
/* direct RXOR */
order = 1;
state = 1;
if (i == src_cnt-1)
addr_count++;
} else if (old_addr == cur_addr + len) {
/* reverse RXOR */
order = -1;
state = 1;
if (i == src_cnt-1)
addr_count++;
} else {
state = 3;
}
break;
case 1:
if (i == src_cnt-2 || (order == -1
&& cur_addr != old_addr - len)) {
order = 0;
state = 0;
addr_count++;
} else if (cur_addr == old_addr + len*order) {
state = 2;
if (i == src_cnt-1)
addr_count++;
} else if (cur_addr == old_addr + 2*len) {
state = 2;
if (i == src_cnt-1)
addr_count++;
} else if (cur_addr == old_addr + 3*len) {
state = 2;
if (i == src_cnt-1)
addr_count++;
} else {
order = 0;
state = 0;
addr_count++;
}
break;
case 2:
order = 0;
state = 0;
addr_count++;
break;
}
if (state == 3)
break;
}
if (src_cnt <= 1 || (state != 1 && state != 2)) {
pr_err("%s: src_cnt=%d, state=%d, addr_count=%d, order=%lld\n",
__func__, src_cnt, state, addr_count, order);
for (i = 0; i < src_cnt; i++)
pr_err("\t[%d] 0x%llx \n", i, srcs[i]);
BUG();
}
return (addr_count + XOR_MAX_OPS - 1) / XOR_MAX_OPS;
}
/******************************************************************************
* ADMA channel low-level routines
******************************************************************************/
static u32
ppc440spe_chan_get_current_descriptor(struct ppc440spe_adma_chan *chan);
static void ppc440spe_chan_append(struct ppc440spe_adma_chan *chan);
/**
* ppc440spe_adma_device_clear_eot_status - interrupt ack to XOR or DMA engine
*/
static void ppc440spe_adma_device_clear_eot_status(
struct ppc440spe_adma_chan *chan)
{
struct dma_regs *dma_reg;
struct xor_regs *xor_reg;
u8 *p = chan->device->dma_desc_pool_virt;
struct dma_cdb *cdb;
u32 rv, i;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
/* read FIFO to ack */
dma_reg = chan->device->dma_reg;
while ((rv = ioread32(&dma_reg->csfpl))) {
i = rv & DMA_CDB_ADDR_MSK;
cdb = (struct dma_cdb *)&p[i -
(u32)chan->device->dma_desc_pool];
/* Clear opcode to ack. This is necessary for
* ZeroSum operations only
*/
cdb->opc = 0;
if (test_bit(PPC440SPE_RXOR_RUN,
&ppc440spe_rxor_state)) {
/* probably this is a completed RXOR op,
* get pointer to CDB using the fact that
* physical and virtual addresses of CDB
* in pools have the same offsets
*/
if (le32_to_cpu(cdb->sg1u) &
DMA_CUED_XOR_BASE) {
/* this is a RXOR */
clear_bit(PPC440SPE_RXOR_RUN,
&ppc440spe_rxor_state);
}
}
if (rv & DMA_CDB_STATUS_MSK) {
/* ZeroSum check failed
*/
struct ppc440spe_adma_desc_slot *iter;
dma_addr_t phys = rv & ~DMA_CDB_MSK;
/*
* Update the status of corresponding
* descriptor.
*/
list_for_each_entry(iter, &chan->chain,
chain_node) {
if (iter->phys == phys)
break;
}
/*
* if cannot find the corresponding
* slot it's a bug
*/
BUG_ON(&iter->chain_node == &chan->chain);
if (iter->xor_check_result) {
if (test_bit(PPC440SPE_DESC_PCHECK,
&iter->flags)) {
*iter->xor_check_result |=
SUM_CHECK_P_RESULT;
} else
if (test_bit(PPC440SPE_DESC_QCHECK,
&iter->flags)) {
*iter->xor_check_result |=
SUM_CHECK_Q_RESULT;
} else
BUG();
}
}
}
rv = ioread32(&dma_reg->dsts);
if (rv) {
pr_err("DMA%d err status: 0x%x\n",
chan->device->id, rv);
/* write back to clear */
iowrite32(rv, &dma_reg->dsts);
}
break;
case PPC440SPE_XOR_ID:
/* reset status bits to ack */
xor_reg = chan->device->xor_reg;
rv = ioread32be(&xor_reg->sr);
iowrite32be(rv, &xor_reg->sr);
if (rv & (XOR_IE_ICBIE_BIT|XOR_IE_ICIE_BIT|XOR_IE_RPTIE_BIT)) {
if (rv & XOR_IE_RPTIE_BIT) {
/* Read PLB Timeout Error.
* Try to resubmit the CB
*/
u32 val = ioread32be(&xor_reg->ccbalr);
iowrite32be(val, &xor_reg->cblalr);
val = ioread32be(&xor_reg->crsr);
iowrite32be(val | XOR_CRSR_XAE_BIT,
&xor_reg->crsr);
} else
pr_err("XOR ERR 0x%x status\n", rv);
break;
}
/* if the XORcore is idle, but there are unprocessed CBs
* then refetch the s/w chain here
*/
if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) &&
do_xor_refetch)
ppc440spe_chan_append(chan);
break;
}
}
/**
* ppc440spe_chan_is_busy - get the channel status
*/
static int ppc440spe_chan_is_busy(struct ppc440spe_adma_chan *chan)
{
struct dma_regs *dma_reg;
struct xor_regs *xor_reg;
int busy = 0;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
dma_reg = chan->device->dma_reg;
/* if command FIFO's head and tail pointers are equal and
* status tail is the same as command, then channel is free
*/
if (ioread16(&dma_reg->cpfhp) != ioread16(&dma_reg->cpftp) ||
ioread16(&dma_reg->cpftp) != ioread16(&dma_reg->csftp))
busy = 1;
break;
case PPC440SPE_XOR_ID:
/* use the special status bit for the XORcore
*/
xor_reg = chan->device->xor_reg;
busy = (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) ? 1 : 0;
break;
}
return busy;
}
/**
* ppc440spe_chan_set_first_xor_descriptor - init XORcore chain
*/
static void ppc440spe_chan_set_first_xor_descriptor(
struct ppc440spe_adma_chan *chan,
struct ppc440spe_adma_desc_slot *next_desc)
{
struct xor_regs *xor_reg = chan->device->xor_reg;
if (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT)
printk(KERN_INFO "%s: Warn: XORcore is running "
"when try to set the first CDB!\n",
__func__);
xor_last_submit = xor_last_linked = next_desc;
iowrite32be(XOR_CRSR_64BA_BIT, &xor_reg->crsr);
iowrite32be(next_desc->phys, &xor_reg->cblalr);
iowrite32be(0, &xor_reg->cblahr);
iowrite32be(ioread32be(&xor_reg->cbcr) | XOR_CBCR_LNK_BIT,
&xor_reg->cbcr);
chan->hw_chain_inited = 1;
}
/**
* ppc440spe_dma_put_desc - put DMA0,1 descriptor to FIFO.
* called with irqs disabled
*/
static void ppc440spe_dma_put_desc(struct ppc440spe_adma_chan *chan,
struct ppc440spe_adma_desc_slot *desc)
{
u32 pcdb;
struct dma_regs *dma_reg = chan->device->dma_reg;
pcdb = desc->phys;
if (!test_bit(PPC440SPE_DESC_INT, &desc->flags))
pcdb |= DMA_CDB_NO_INT;
chan_last_sub[chan->device->id] = desc;
ADMA_LL_DBG(print_cb(chan, desc->hw_desc));
iowrite32(pcdb, &dma_reg->cpfpl);
}
/**
* ppc440spe_chan_append - update the h/w chain in the channel
*/
static void ppc440spe_chan_append(struct ppc440spe_adma_chan *chan)
{
struct xor_regs *xor_reg;
struct ppc440spe_adma_desc_slot *iter;
struct xor_cb *xcb;
u32 cur_desc;
unsigned long flags;
local_irq_save(flags);
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
cur_desc = ppc440spe_chan_get_current_descriptor(chan);
if (likely(cur_desc)) {
iter = chan_last_sub[chan->device->id];
BUG_ON(!iter);
} else {
/* first peer */
iter = chan_first_cdb[chan->device->id];
BUG_ON(!iter);
ppc440spe_dma_put_desc(chan, iter);
chan->hw_chain_inited = 1;
}
/* is there something new to append */
if (!iter->hw_next)
break;
/* flush descriptors from the s/w queue to fifo */
list_for_each_entry_continue(iter, &chan->chain, chain_node) {
ppc440spe_dma_put_desc(chan, iter);
if (!iter->hw_next)
break;
}
break;
case PPC440SPE_XOR_ID:
/* update h/w links and refetch */
if (!xor_last_submit->hw_next)
break;
xor_reg = chan->device->xor_reg;
/* the last linked CDB has to generate an interrupt
* that we'd be able to append the next lists to h/w
* regardless of the XOR engine state at the moment of
* appending of these next lists
*/
xcb = xor_last_linked->hw_desc;
xcb->cbc |= XOR_CBCR_CBCE_BIT;
if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT)) {
/* XORcore is idle. Refetch now */
do_xor_refetch = 0;
ppc440spe_xor_set_link(xor_last_submit,
xor_last_submit->hw_next);
ADMA_LL_DBG(print_cb_list(chan,
xor_last_submit->hw_next));
xor_last_submit = xor_last_linked;
iowrite32be(ioread32be(&xor_reg->crsr) |
XOR_CRSR_RCBE_BIT | XOR_CRSR_64BA_BIT,
&xor_reg->crsr);
} else {
/* XORcore is running. Refetch later in the handler */
do_xor_refetch = 1;
}
break;
}
local_irq_restore(flags);
}
/**
* ppc440spe_chan_get_current_descriptor - get the currently executed descriptor
*/
static u32
ppc440spe_chan_get_current_descriptor(struct ppc440spe_adma_chan *chan)
{
struct dma_regs *dma_reg;
struct xor_regs *xor_reg;
if (unlikely(!chan->hw_chain_inited))
/* h/w descriptor chain is not initialized yet */
return 0;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
dma_reg = chan->device->dma_reg;
return ioread32(&dma_reg->acpl) & (~DMA_CDB_MSK);
case PPC440SPE_XOR_ID:
xor_reg = chan->device->xor_reg;
return ioread32be(&xor_reg->ccbalr);
}
return 0;
}
/**
* ppc440spe_chan_run - enable the channel
*/
static void ppc440spe_chan_run(struct ppc440spe_adma_chan *chan)
{
struct xor_regs *xor_reg;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
/* DMAs are always enabled, do nothing */
break;
case PPC440SPE_XOR_ID:
/* drain write buffer */
xor_reg = chan->device->xor_reg;
/* fetch descriptor pointed to in <link> */
iowrite32be(XOR_CRSR_64BA_BIT | XOR_CRSR_XAE_BIT,
&xor_reg->crsr);
break;
}
}
/******************************************************************************
* ADMA device level
******************************************************************************/
static void ppc440spe_chan_start_null_xor(struct ppc440spe_adma_chan *chan);
static int ppc440spe_adma_alloc_chan_resources(struct dma_chan *chan);
static dma_cookie_t
ppc440spe_adma_tx_submit(struct dma_async_tx_descriptor *tx);
static void ppc440spe_adma_set_dest(struct ppc440spe_adma_desc_slot *tx,
dma_addr_t addr, int index);
static void
ppc440spe_adma_memcpy_xor_set_src(struct ppc440spe_adma_desc_slot *tx,
dma_addr_t addr, int index);
static void
ppc440spe_adma_pq_set_dest(struct ppc440spe_adma_desc_slot *tx,
dma_addr_t *paddr, unsigned long flags);
static void
ppc440spe_adma_pq_set_src(struct ppc440spe_adma_desc_slot *tx,
dma_addr_t addr, int index);
static void
ppc440spe_adma_pq_set_src_mult(struct ppc440spe_adma_desc_slot *tx,
unsigned char mult, int index, int dst_pos);
static void
ppc440spe_adma_pqzero_sum_set_dest(struct ppc440spe_adma_desc_slot *tx,
dma_addr_t paddr, dma_addr_t qaddr);
static struct page *ppc440spe_rxor_srcs[32];
/**
* ppc440spe_can_rxor - check if the operands may be processed with RXOR
*/
static int ppc440spe_can_rxor(struct page **srcs, int src_cnt, size_t len)
{
int i, order = 0, state = 0;
int idx = 0;
if (unlikely(!(src_cnt > 1)))
return 0;
BUG_ON(src_cnt > ARRAY_SIZE(ppc440spe_rxor_srcs));
/* Skip holes in the source list before checking */
for (i = 0; i < src_cnt; i++) {
if (!srcs[i])
continue;
ppc440spe_rxor_srcs[idx++] = srcs[i];
}
src_cnt = idx;
for (i = 1; i < src_cnt; i++) {
char *cur_addr = page_address(ppc440spe_rxor_srcs[i]);
char *old_addr = page_address(ppc440spe_rxor_srcs[i - 1]);
switch (state) {
case 0:
if (cur_addr == old_addr + len) {
/* direct RXOR */
order = 1;
state = 1;
} else if (old_addr == cur_addr + len) {
/* reverse RXOR */
order = -1;
state = 1;
} else
goto out;
break;
case 1:
if ((i == src_cnt - 2) ||
(order == -1 && cur_addr != old_addr - len)) {
order = 0;
state = 0;
} else if ((cur_addr == old_addr + len * order) ||
(cur_addr == old_addr + 2 * len) ||
(cur_addr == old_addr + 3 * len)) {
state = 2;
} else {
order = 0;
state = 0;
}
break;
case 2:
order = 0;
state = 0;
break;
}
}
out:
if (state == 1 || state == 2)
return 1;
return 0;
}
/**
* ppc440spe_adma_device_estimate - estimate the efficiency of processing
* the operation given on this channel. It's assumed that 'chan' is
* capable to process 'cap' type of operation.
* @chan: channel to use
* @cap: type of transaction
* @dst_lst: array of destination pointers
* @dst_cnt: number of destination operands
* @src_lst: array of source pointers
* @src_cnt: number of source operands
* @src_sz: size of each source operand
*/
static int ppc440spe_adma_estimate(struct dma_chan *chan,
enum dma_transaction_type cap, struct page **dst_lst, int dst_cnt,
struct page **src_lst, int src_cnt, size_t src_sz)
{
int ef = 1;
if (cap == DMA_PQ || cap == DMA_PQ_VAL) {
/* If RAID-6 capabilities were not activated don't try
* to use them
*/
if (unlikely(!ppc440spe_r6_enabled))
return -1;
}
/* In the current implementation of ppc440spe ADMA driver it
* makes sense to pick out only pq case, because it may be
* processed:
* (1) either using Biskup method on DMA2;
* (2) or on DMA0/1.
* Thus we give a favour to (1) if the sources are suitable;
* else let it be processed on one of the DMA0/1 engines.
* In the sum_product case where destination is also the
* source process it on DMA0/1 only.
*/
if (cap == DMA_PQ && chan->chan_id == PPC440SPE_XOR_ID) {
if (dst_cnt == 1 && src_cnt == 2 && dst_lst[0] == src_lst[1])
ef = 0; /* sum_product case, process on DMA0/1 */
else if (ppc440spe_can_rxor(src_lst, src_cnt, src_sz))
ef = 3; /* override (DMA0/1 + idle) */
else
ef = 0; /* can't process on DMA2 if !rxor */
}
/* channel idleness increases the priority */
if (likely(ef) &&
!ppc440spe_chan_is_busy(to_ppc440spe_adma_chan(chan)))
ef++;
return ef;
}
struct dma_chan *
ppc440spe_async_tx_find_best_channel(enum dma_transaction_type cap,
struct page **dst_lst, int dst_cnt, struct page **src_lst,
int src_cnt, size_t src_sz)
{
struct dma_chan *best_chan = NULL;
struct ppc_dma_chan_ref *ref;
int best_rank = -1;
if (unlikely(!src_sz))
return NULL;
if (src_sz > PAGE_SIZE) {
/*
* should a user of the api ever pass > PAGE_SIZE requests
* we sort out cases where temporary page-sized buffers
* are used.
*/
switch (cap) {
case DMA_PQ:
if (src_cnt == 1 && dst_lst[1] == src_lst[0])
return NULL;
if (src_cnt == 2 && dst_lst[1] == src_lst[1])
return NULL;
break;
case DMA_PQ_VAL:
case DMA_XOR_VAL:
return NULL;
default:
break;
}
}
list_for_each_entry(ref, &ppc440spe_adma_chan_list, node) {
if (dma_has_cap(cap, ref->chan->device->cap_mask)) {
int rank;
rank = ppc440spe_adma_estimate(ref->chan, cap, dst_lst,
dst_cnt, src_lst, src_cnt, src_sz);
if (rank > best_rank) {
best_rank = rank;
best_chan = ref->chan;
}
}
}
return best_chan;
}
EXPORT_SYMBOL_GPL(ppc440spe_async_tx_find_best_channel);
/**
* ppc440spe_get_group_entry - get group entry with index idx
* @tdesc: is the last allocated slot in the group.
*/
static struct ppc440spe_adma_desc_slot *
ppc440spe_get_group_entry(struct ppc440spe_adma_desc_slot *tdesc, u32 entry_idx)
{
struct ppc440spe_adma_desc_slot *iter = tdesc->group_head;
int i = 0;
if (entry_idx < 0 || entry_idx >= (tdesc->src_cnt + tdesc->dst_cnt)) {
printk("%s: entry_idx %d, src_cnt %d, dst_cnt %d\n",
__func__, entry_idx, tdesc->src_cnt, tdesc->dst_cnt);
BUG();
}
list_for_each_entry(iter, &tdesc->group_list, chain_node) {
if (i++ == entry_idx)
break;
}
return iter;
}
/**
* ppc440spe_adma_free_slots - flags descriptor slots for reuse
* @slot: Slot to free
* Caller must hold &ppc440spe_chan->lock while calling this function
*/
static void ppc440spe_adma_free_slots(struct ppc440spe_adma_desc_slot *slot,
struct ppc440spe_adma_chan *chan)
{
int stride = slot->slots_per_op;
while (stride--) {
slot->slots_per_op = 0;
slot = list_entry(slot->slot_node.next,
struct ppc440spe_adma_desc_slot,
slot_node);
}
}
/**
* ppc440spe_adma_run_tx_complete_actions - call functions to be called
* upon completion
*/
static dma_cookie_t ppc440spe_adma_run_tx_complete_actions(
struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_adma_chan *chan,
dma_cookie_t cookie)
{
BUG_ON(desc->async_tx.cookie < 0);
if (desc->async_tx.cookie > 0) {
cookie = desc->async_tx.cookie;
desc->async_tx.cookie = 0;
dma_descriptor_unmap(&desc->async_tx);
/* call the callback (must not sleep or submit new
* operations to this channel)
*/
dmaengine_desc_get_callback_invoke(&desc->async_tx, NULL);
}
/* run dependent operations */
dma_run_dependencies(&desc->async_tx);
return cookie;
}
/**
* ppc440spe_adma_clean_slot - clean up CDB slot (if ack is set)
*/
static int ppc440spe_adma_clean_slot(struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_adma_chan *chan)
{
/* the client is allowed to attach dependent operations
* until 'ack' is set
*/
if (!async_tx_test_ack(&desc->async_tx))
return 0;
/* leave the last descriptor in the chain
* so we can append to it
*/
if (list_is_last(&desc->chain_node, &chan->chain) ||
desc->phys == ppc440spe_chan_get_current_descriptor(chan))
return 1;
if (chan->device->id != PPC440SPE_XOR_ID) {
/* our DMA interrupt handler clears opc field of
* each processed descriptor. For all types of
* operations except for ZeroSum we do not actually
* need ack from the interrupt handler. ZeroSum is a
* special case since the result of this operation
* is available from the handler only, so if we see
* such type of descriptor (which is unprocessed yet)
* then leave it in chain.
*/
struct dma_cdb *cdb = desc->hw_desc;
if (cdb->opc == DMA_CDB_OPC_DCHECK128)
return 1;
}
dev_dbg(chan->device->common.dev, "\tfree slot %llx: %d stride: %d\n",
desc->phys, desc->idx, desc->slots_per_op);
list_del(&desc->chain_node);
ppc440spe_adma_free_slots(desc, chan);
return 0;
}
/**
* __ppc440spe_adma_slot_cleanup - this is the common clean-up routine
* which runs through the channel CDBs list until reach the descriptor
* currently processed. When routine determines that all CDBs of group
* are completed then corresponding callbacks (if any) are called and slots
* are freed.
*/
static void __ppc440spe_adma_slot_cleanup(struct ppc440spe_adma_chan *chan)
{
struct ppc440spe_adma_desc_slot *iter, *_iter, *group_start = NULL;
dma_cookie_t cookie = 0;
u32 current_desc = ppc440spe_chan_get_current_descriptor(chan);
int busy = ppc440spe_chan_is_busy(chan);
int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
dev_dbg(chan->device->common.dev, "ppc440spe adma%d: %s\n",
chan->device->id, __func__);
if (!current_desc) {
/* There were no transactions yet, so
* nothing to clean
*/
return;
}
/* free completed slots from the chain starting with
* the oldest descriptor
*/
list_for_each_entry_safe(iter, _iter, &chan->chain,
chain_node) {
dev_dbg(chan->device->common.dev, "\tcookie: %d slot: %d "
"busy: %d this_desc: %#llx next_desc: %#x "
"cur: %#x ack: %d\n",
iter->async_tx.cookie, iter->idx, busy, iter->phys,
ppc440spe_desc_get_link(iter, chan), current_desc,
async_tx_test_ack(&iter->async_tx));
prefetch(_iter);
prefetch(&_iter->async_tx);
/* do not advance past the current descriptor loaded into the
* hardware channel,subsequent descriptors are either in process
* or have not been submitted
*/
if (seen_current)
break;
/* stop the search if we reach the current descriptor and the
* channel is busy, or if it appears that the current descriptor
* needs to be re-read (i.e. has been appended to)
*/
if (iter->phys == current_desc) {
BUG_ON(seen_current++);
if (busy || ppc440spe_desc_get_link(iter, chan)) {
/* not all descriptors of the group have
* been completed; exit.
*/
break;
}
}
/* detect the start of a group transaction */
if (!slot_cnt && !slots_per_op) {
slot_cnt = iter->slot_cnt;
slots_per_op = iter->slots_per_op;
if (slot_cnt <= slots_per_op) {
slot_cnt = 0;
slots_per_op = 0;
}
}
if (slot_cnt) {
if (!group_start)
group_start = iter;
slot_cnt -= slots_per_op;
}
/* all the members of a group are complete */
if (slots_per_op != 0 && slot_cnt == 0) {
struct ppc440spe_adma_desc_slot *grp_iter, *_grp_iter;
int end_of_chain = 0;
/* clean up the group */
slot_cnt = group_start->slot_cnt;
grp_iter = group_start;
list_for_each_entry_safe_from(grp_iter, _grp_iter,
&chan->chain, chain_node) {
cookie = ppc440spe_adma_run_tx_complete_actions(
grp_iter, chan, cookie);
slot_cnt -= slots_per_op;
end_of_chain = ppc440spe_adma_clean_slot(
grp_iter, chan);
if (end_of_chain && slot_cnt) {
/* Should wait for ZeroSum completion */
if (cookie > 0)
chan->common.completed_cookie = cookie;
return;
}
if (slot_cnt == 0 || end_of_chain)
break;
}
/* the group should be complete at this point */
BUG_ON(slot_cnt);
slots_per_op = 0;
group_start = NULL;
if (end_of_chain)
break;
else
continue;
} else if (slots_per_op) /* wait for group completion */
continue;
cookie = ppc440spe_adma_run_tx_complete_actions(iter, chan,
cookie);
if (ppc440spe_adma_clean_slot(iter, chan))
break;
}
BUG_ON(!seen_current);
if (cookie > 0) {
chan->common.completed_cookie = cookie;
pr_debug("\tcompleted cookie %d\n", cookie);
}
}
/**
* ppc440spe_adma_tasklet - clean up watch-dog initiator
*/
static void ppc440spe_adma_tasklet(struct tasklet_struct *t)
{
struct ppc440spe_adma_chan *chan = from_tasklet(chan, t, irq_tasklet);
spin_lock_nested(&chan->lock, SINGLE_DEPTH_NESTING);
__ppc440spe_adma_slot_cleanup(chan);
spin_unlock(&chan->lock);
}
/**
* ppc440spe_adma_slot_cleanup - clean up scheduled initiator
*/
static void ppc440spe_adma_slot_cleanup(struct ppc440spe_adma_chan *chan)
{
spin_lock_bh(&chan->lock);
__ppc440spe_adma_slot_cleanup(chan);
spin_unlock_bh(&chan->lock);
}
/**
* ppc440spe_adma_alloc_slots - allocate free slots (if any)
*/
static struct ppc440spe_adma_desc_slot *ppc440spe_adma_alloc_slots(
struct ppc440spe_adma_chan *chan, int num_slots,
int slots_per_op)
{
struct ppc440spe_adma_desc_slot *iter = NULL, *_iter;
struct ppc440spe_adma_desc_slot *alloc_start = NULL;
int slots_found, retry = 0;
LIST_HEAD(chain);
BUG_ON(!num_slots || !slots_per_op);
/* start search from the last allocated descrtiptor
* if a contiguous allocation can not be found start searching
* from the beginning of the list
*/
retry:
slots_found = 0;
if (retry == 0)
iter = chan->last_used;
else
iter = list_entry(&chan->all_slots,
struct ppc440spe_adma_desc_slot,
slot_node);
list_for_each_entry_safe_continue(iter, _iter, &chan->all_slots,
slot_node) {
prefetch(_iter);
prefetch(&_iter->async_tx);
if (iter->slots_per_op) {
slots_found = 0;
continue;
}
/* start the allocation if the slot is correctly aligned */
if (!slots_found++)
alloc_start = iter;
if (slots_found == num_slots) {
struct ppc440spe_adma_desc_slot *alloc_tail = NULL;
struct ppc440spe_adma_desc_slot *last_used = NULL;
iter = alloc_start;
while (num_slots) {
int i;
/* pre-ack all but the last descriptor */
if (num_slots != slots_per_op)
async_tx_ack(&iter->async_tx);
list_add_tail(&iter->chain_node, &chain);
alloc_tail = iter;
iter->async_tx.cookie = 0;
iter->hw_next = NULL;
iter->flags = 0;
iter->slot_cnt = num_slots;
iter->xor_check_result = NULL;
for (i = 0; i < slots_per_op; i++) {
iter->slots_per_op = slots_per_op - i;
last_used = iter;
iter = list_entry(iter->slot_node.next,
struct ppc440spe_adma_desc_slot,
slot_node);
}
num_slots -= slots_per_op;
}
alloc_tail->group_head = alloc_start;
alloc_tail->async_tx.cookie = -EBUSY;
list_splice(&chain, &alloc_tail->group_list);
chan->last_used = last_used;
return alloc_tail;
}
}
if (!retry++)
goto retry;
/* try to free some slots if the allocation fails */
tasklet_schedule(&chan->irq_tasklet);
return NULL;
}
/**
* ppc440spe_adma_alloc_chan_resources - allocate pools for CDB slots
*/
static int ppc440spe_adma_alloc_chan_resources(struct dma_chan *chan)
{
struct ppc440spe_adma_chan *ppc440spe_chan;
struct ppc440spe_adma_desc_slot *slot = NULL;
char *hw_desc;
int i, db_sz;
int init;
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
init = ppc440spe_chan->slots_allocated ? 0 : 1;
chan->chan_id = ppc440spe_chan->device->id;
/* Allocate descriptor slots */
i = ppc440spe_chan->slots_allocated;
if (ppc440spe_chan->device->id != PPC440SPE_XOR_ID)
db_sz = sizeof(struct dma_cdb);
else
db_sz = sizeof(struct xor_cb);
for (; i < (ppc440spe_chan->device->pool_size / db_sz); i++) {
slot = kzalloc(sizeof(struct ppc440spe_adma_desc_slot),
GFP_KERNEL);
if (!slot) {
printk(KERN_INFO "SPE ADMA Channel only initialized"
" %d descriptor slots", i--);
break;
}
hw_desc = (char *) ppc440spe_chan->device->dma_desc_pool_virt;
slot->hw_desc = (void *) &hw_desc[i * db_sz];
dma_async_tx_descriptor_init(&slot->async_tx, chan);
slot->async_tx.tx_submit = ppc440spe_adma_tx_submit;
INIT_LIST_HEAD(&slot->chain_node);
INIT_LIST_HEAD(&slot->slot_node);
INIT_LIST_HEAD(&slot->group_list);
slot->phys = ppc440spe_chan->device->dma_desc_pool + i * db_sz;
slot->idx = i;
spin_lock_bh(&ppc440spe_chan->lock);
ppc440spe_chan->slots_allocated++;
list_add_tail(&slot->slot_node, &ppc440spe_chan->all_slots);
spin_unlock_bh(&ppc440spe_chan->lock);
}
if (i && !ppc440spe_chan->last_used) {
ppc440spe_chan->last_used =
list_entry(ppc440spe_chan->all_slots.next,
struct ppc440spe_adma_desc_slot,
slot_node);
}
dev_dbg(ppc440spe_chan->device->common.dev,
"ppc440spe adma%d: allocated %d descriptor slots\n",
ppc440spe_chan->device->id, i);
/* initialize the channel and the chain with a null operation */
if (init) {
switch (ppc440spe_chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
ppc440spe_chan->hw_chain_inited = 0;
/* Use WXOR for self-testing */
if (!ppc440spe_r6_tchan)
ppc440spe_r6_tchan = ppc440spe_chan;
break;
case PPC440SPE_XOR_ID:
ppc440spe_chan_start_null_xor(ppc440spe_chan);
break;
default:
BUG();
}
ppc440spe_chan->needs_unmap = 1;
}
return (i > 0) ? i : -ENOMEM;
}
/**
* ppc440spe_rxor_set_region_data -
*/
static void ppc440spe_rxor_set_region(struct ppc440spe_adma_desc_slot *desc,
u8 xor_arg_no, u32 mask)
{
struct xor_cb *xcb = desc->hw_desc;
xcb->ops[xor_arg_no].h |= mask;
}
/**
* ppc440spe_rxor_set_src -
*/
static void ppc440spe_rxor_set_src(struct ppc440spe_adma_desc_slot *desc,
u8 xor_arg_no, dma_addr_t addr)
{
struct xor_cb *xcb = desc->hw_desc;
xcb->ops[xor_arg_no].h |= DMA_CUED_XOR_BASE;
xcb->ops[xor_arg_no].l = addr;
}
/**
* ppc440spe_rxor_set_mult -
*/
static void ppc440spe_rxor_set_mult(struct ppc440spe_adma_desc_slot *desc,
u8 xor_arg_no, u8 idx, u8 mult)
{
struct xor_cb *xcb = desc->hw_desc;
xcb->ops[xor_arg_no].h |= mult << (DMA_CUED_MULT1_OFF + idx * 8);
}
/**
* ppc440spe_adma_check_threshold - append CDBs to h/w chain if threshold
* has been achieved
*/
static void ppc440spe_adma_check_threshold(struct ppc440spe_adma_chan *chan)
{
dev_dbg(chan->device->common.dev, "ppc440spe adma%d: pending: %d\n",
chan->device->id, chan->pending);
if (chan->pending >= PPC440SPE_ADMA_THRESHOLD) {
chan->pending = 0;
ppc440spe_chan_append(chan);
}
}
/**
* ppc440spe_adma_tx_submit - submit new descriptor group to the channel
* (it's not necessary that descriptors will be submitted to the h/w
* chains too right now)
*/
static dma_cookie_t ppc440spe_adma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct ppc440spe_adma_desc_slot *sw_desc;
struct ppc440spe_adma_chan *chan = to_ppc440spe_adma_chan(tx->chan);
struct ppc440spe_adma_desc_slot *group_start, *old_chain_tail;
int slot_cnt;
int slots_per_op;
dma_cookie_t cookie;
sw_desc = tx_to_ppc440spe_adma_slot(tx);
group_start = sw_desc->group_head;
slot_cnt = group_start->slot_cnt;
slots_per_op = group_start->slots_per_op;
spin_lock_bh(&chan->lock);
cookie = dma_cookie_assign(tx);
if (unlikely(list_empty(&chan->chain))) {
/* first peer */
list_splice_init(&sw_desc->group_list, &chan->chain);
chan_first_cdb[chan->device->id] = group_start;
} else {
/* isn't first peer, bind CDBs to chain */
old_chain_tail = list_entry(chan->chain.prev,
struct ppc440spe_adma_desc_slot,
chain_node);
list_splice_init(&sw_desc->group_list,
&old_chain_tail->chain_node);
/* fix up the hardware chain */
ppc440spe_desc_set_link(chan, old_chain_tail, group_start);
}
/* increment the pending count by the number of operations */
chan->pending += slot_cnt / slots_per_op;
ppc440spe_adma_check_threshold(chan);
spin_unlock_bh(&chan->lock);
dev_dbg(chan->device->common.dev,
"ppc440spe adma%d: %s cookie: %d slot: %d tx %p\n",
chan->device->id, __func__,
sw_desc->async_tx.cookie, sw_desc->idx, sw_desc);
return cookie;
}
/**
* ppc440spe_adma_prep_dma_interrupt - prepare CDB for a pseudo DMA operation
*/
static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_interrupt(
struct dma_chan *chan, unsigned long flags)
{
struct ppc440spe_adma_chan *ppc440spe_chan;
struct ppc440spe_adma_desc_slot *sw_desc, *group_start;
int slot_cnt, slots_per_op;
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
dev_dbg(ppc440spe_chan->device->common.dev,
"ppc440spe adma%d: %s\n", ppc440spe_chan->device->id,
__func__);
spin_lock_bh(&ppc440spe_chan->lock);
slot_cnt = slots_per_op = 1;
sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt,
slots_per_op);
if (sw_desc) {
group_start = sw_desc->group_head;
ppc440spe_desc_init_interrupt(group_start, ppc440spe_chan);
group_start->unmap_len = 0;
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&ppc440spe_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
/**
* ppc440spe_adma_prep_dma_memcpy - prepare CDB for a MEMCPY operation
*/
static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dma_dest,
dma_addr_t dma_src, size_t len, unsigned long flags)
{
struct ppc440spe_adma_chan *ppc440spe_chan;
struct ppc440spe_adma_desc_slot *sw_desc, *group_start;
int slot_cnt, slots_per_op;
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
if (unlikely(!len))
return NULL;
BUG_ON(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT);
spin_lock_bh(&ppc440spe_chan->lock);
dev_dbg(ppc440spe_chan->device->common.dev,
"ppc440spe adma%d: %s len: %u int_en %d\n",
ppc440spe_chan->device->id, __func__, len,
flags & DMA_PREP_INTERRUPT ? 1 : 0);
slot_cnt = slots_per_op = 1;
sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt,
slots_per_op);
if (sw_desc) {
group_start = sw_desc->group_head;
ppc440spe_desc_init_memcpy(group_start, flags);
ppc440spe_adma_set_dest(group_start, dma_dest, 0);
ppc440spe_adma_memcpy_xor_set_src(group_start, dma_src, 0);
ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len);
sw_desc->unmap_len = len;
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&ppc440spe_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
/**
* ppc440spe_adma_prep_dma_xor - prepare CDB for a XOR operation
*/
static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor(
struct dma_chan *chan, dma_addr_t dma_dest,
dma_addr_t *dma_src, u32 src_cnt, size_t len,
unsigned long flags)
{
struct ppc440spe_adma_chan *ppc440spe_chan;
struct ppc440spe_adma_desc_slot *sw_desc, *group_start;
int slot_cnt, slots_per_op;
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
ADMA_LL_DBG(prep_dma_xor_dbg(ppc440spe_chan->device->id,
dma_dest, dma_src, src_cnt));
if (unlikely(!len))
return NULL;
BUG_ON(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT);
dev_dbg(ppc440spe_chan->device->common.dev,
"ppc440spe adma%d: %s src_cnt: %d len: %u int_en: %d\n",
ppc440spe_chan->device->id, __func__, src_cnt, len,
flags & DMA_PREP_INTERRUPT ? 1 : 0);
spin_lock_bh(&ppc440spe_chan->lock);
slot_cnt = ppc440spe_chan_xor_slot_count(len, src_cnt, &slots_per_op);
sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt,
slots_per_op);
if (sw_desc) {
group_start = sw_desc->group_head;
ppc440spe_desc_init_xor(group_start, src_cnt, flags);
ppc440spe_adma_set_dest(group_start, dma_dest, 0);
while (src_cnt--)
ppc440spe_adma_memcpy_xor_set_src(group_start,
dma_src[src_cnt], src_cnt);
ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len);
sw_desc->unmap_len = len;
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&ppc440spe_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
static inline void
ppc440spe_desc_set_xor_src_cnt(struct ppc440spe_adma_desc_slot *desc,
int src_cnt);
static void ppc440spe_init_rxor_cursor(struct ppc440spe_rxor *cursor);
/**
* ppc440spe_adma_init_dma2rxor_slot -
*/
static void ppc440spe_adma_init_dma2rxor_slot(
struct ppc440spe_adma_desc_slot *desc,
dma_addr_t *src, int src_cnt)
{
int i;
/* initialize CDB */
for (i = 0; i < src_cnt; i++) {
ppc440spe_adma_dma2rxor_prep_src(desc, &desc->rxor_cursor, i,
desc->src_cnt, (u32)src[i]);
}
}
/**
* ppc440spe_dma01_prep_mult -
* for Q operation where destination is also the source
*/
static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_mult(
struct ppc440spe_adma_chan *ppc440spe_chan,
dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt,
const unsigned char *scf, size_t len, unsigned long flags)
{
struct ppc440spe_adma_desc_slot *sw_desc = NULL;
unsigned long op = 0;
int slot_cnt;
set_bit(PPC440SPE_DESC_WXOR, &op);
slot_cnt = 2;
spin_lock_bh(&ppc440spe_chan->lock);
/* use WXOR, each descriptor occupies one slot */
sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1);
if (sw_desc) {
struct ppc440spe_adma_chan *chan;
struct ppc440spe_adma_desc_slot *iter;
struct dma_cdb *hw_desc;
chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan);
set_bits(op, &sw_desc->flags);
sw_desc->src_cnt = src_cnt;
sw_desc->dst_cnt = dst_cnt;
/* First descriptor, zero data in the destination and copy it
* to q page using MULTICAST transfer.
*/
iter = list_first_entry(&sw_desc->group_list,
struct ppc440spe_adma_desc_slot,
chain_node);
memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
/* set 'next' pointer */
iter->hw_next = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
clear_bit(PPC440SPE_DESC_INT, &iter->flags);
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MULTICAST;
ppc440spe_desc_set_dest_addr(iter, chan,
DMA_CUED_XOR_BASE, dst[0], 0);
ppc440spe_desc_set_dest_addr(iter, chan, 0, dst[1], 1);
ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB,
src[0]);
ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len);
iter->unmap_len = len;
/*
* Second descriptor, multiply data from the q page
* and store the result in real destination.
*/
iter = list_first_entry(&iter->chain_node,
struct ppc440spe_adma_desc_slot,
chain_node);
memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
iter->hw_next = NULL;
if (flags & DMA_PREP_INTERRUPT)
set_bit(PPC440SPE_DESC_INT, &iter->flags);
else
clear_bit(PPC440SPE_DESC_INT, &iter->flags);
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
ppc440spe_desc_set_src_addr(iter, chan, 0,
DMA_CUED_XOR_HB, dst[1]);
ppc440spe_desc_set_dest_addr(iter, chan,
DMA_CUED_XOR_BASE, dst[0], 0);
ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF,
DMA_CDB_SG_DST1, scf[0]);
ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len);
iter->unmap_len = len;
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&ppc440spe_chan->lock);
return sw_desc;
}
/**
* ppc440spe_dma01_prep_sum_product -
* Dx = A*(P+Pxy) + B*(Q+Qxy) operation where destination is also
* the source.
*/
static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_sum_product(
struct ppc440spe_adma_chan *ppc440spe_chan,
dma_addr_t *dst, dma_addr_t *src, int src_cnt,
const unsigned char *scf, size_t len, unsigned long flags)
{
struct ppc440spe_adma_desc_slot *sw_desc = NULL;
unsigned long op = 0;
int slot_cnt;
set_bit(PPC440SPE_DESC_WXOR, &op);
slot_cnt = 3;
spin_lock_bh(&ppc440spe_chan->lock);
/* WXOR, each descriptor occupies one slot */
sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1);
if (sw_desc) {
struct ppc440spe_adma_chan *chan;
struct ppc440spe_adma_desc_slot *iter;
struct dma_cdb *hw_desc;
chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan);
set_bits(op, &sw_desc->flags);
sw_desc->src_cnt = src_cnt;
sw_desc->dst_cnt = 1;
/* 1st descriptor, src[1] data to q page and zero destination */
iter = list_first_entry(&sw_desc->group_list,
struct ppc440spe_adma_desc_slot,
chain_node);
memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
iter->hw_next = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
clear_bit(PPC440SPE_DESC_INT, &iter->flags);
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MULTICAST;
ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE,
*dst, 0);
ppc440spe_desc_set_dest_addr(iter, chan, 0,
ppc440spe_chan->qdest, 1);
ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB,
src[1]);
ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len);
iter->unmap_len = len;
/* 2nd descriptor, multiply src[1] data and store the
* result in destination */
iter = list_first_entry(&iter->chain_node,
struct ppc440spe_adma_desc_slot,
chain_node);
memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
/* set 'next' pointer */
iter->hw_next = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
if (flags & DMA_PREP_INTERRUPT)
set_bit(PPC440SPE_DESC_INT, &iter->flags);
else
clear_bit(PPC440SPE_DESC_INT, &iter->flags);
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB,
ppc440spe_chan->qdest);
ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE,
*dst, 0);
ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF,
DMA_CDB_SG_DST1, scf[1]);
ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len);
iter->unmap_len = len;
/*
* 3rd descriptor, multiply src[0] data and xor it
* with destination
*/
iter = list_first_entry(&iter->chain_node,
struct ppc440spe_adma_desc_slot,
chain_node);
memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
iter->hw_next = NULL;
if (flags & DMA_PREP_INTERRUPT)
set_bit(PPC440SPE_DESC_INT, &iter->flags);
else
clear_bit(PPC440SPE_DESC_INT, &iter->flags);
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB,
src[0]);
ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE,
*dst, 0);
ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF,
DMA_CDB_SG_DST1, scf[0]);
ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len);
iter->unmap_len = len;
sw_desc->async_tx.flags = flags;
}
spin_unlock_bh(&ppc440spe_chan->lock);
return sw_desc;
}
static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_pq(
struct ppc440spe_adma_chan *ppc440spe_chan,
dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt,
const unsigned char *scf, size_t len, unsigned long flags)
{
int slot_cnt;
struct ppc440spe_adma_desc_slot *sw_desc = NULL, *iter;
unsigned long op = 0;
unsigned char mult = 1;
pr_debug("%s: dst_cnt %d, src_cnt %d, len %d\n",
__func__, dst_cnt, src_cnt, len);
/* select operations WXOR/RXOR depending on the
* source addresses of operators and the number
* of destinations (RXOR support only Q-parity calculations)
*/
set_bit(PPC440SPE_DESC_WXOR, &op);
if (!test_and_set_bit(PPC440SPE_RXOR_RUN, &ppc440spe_rxor_state)) {
/* no active RXOR;
* do RXOR if:
* - there are more than 1 source,
* - len is aligned on 512-byte boundary,
* - source addresses fit to one of 4 possible regions.
*/
if (src_cnt > 1 &&
!(len & MQ0_CF2H_RXOR_BS_MASK) &&
(src[0] + len) == src[1]) {
/* may do RXOR R1 R2 */
set_bit(PPC440SPE_DESC_RXOR, &op);
if (src_cnt != 2) {
/* may try to enhance region of RXOR */
if ((src[1] + len) == src[2]) {
/* do RXOR R1 R2 R3 */
set_bit(PPC440SPE_DESC_RXOR123,
&op);
} else if ((src[1] + len * 2) == src[2]) {
/* do RXOR R1 R2 R4 */
set_bit(PPC440SPE_DESC_RXOR124, &op);
} else if ((src[1] + len * 3) == src[2]) {
/* do RXOR R1 R2 R5 */
set_bit(PPC440SPE_DESC_RXOR125,
&op);
} else {
/* do RXOR R1 R2 */
set_bit(PPC440SPE_DESC_RXOR12,
&op);
}
} else {
/* do RXOR R1 R2 */
set_bit(PPC440SPE_DESC_RXOR12, &op);
}
}
if (!test_bit(PPC440SPE_DESC_RXOR, &op)) {
/* can not do this operation with RXOR */
clear_bit(PPC440SPE_RXOR_RUN,
&ppc440spe_rxor_state);
} else {
/* can do; set block size right now */
ppc440spe_desc_set_rxor_block_size(len);
}
}
/* Number of necessary slots depends on operation type selected */
if (!test_bit(PPC440SPE_DESC_RXOR, &op)) {
/* This is a WXOR only chain. Need descriptors for each
* source to GF-XOR them with WXOR, and need descriptors
* for each destination to zero them with WXOR
*/
slot_cnt = src_cnt;
if (flags & DMA_PREP_ZERO_P) {
slot_cnt++;
set_bit(PPC440SPE_ZERO_P, &op);
}
if (flags & DMA_PREP_ZERO_Q) {
slot_cnt++;
set_bit(PPC440SPE_ZERO_Q, &op);
}
} else {
/* Need 1/2 descriptor for RXOR operation, and
* need (src_cnt - (2 or 3)) for WXOR of sources
* remained (if any)
*/
slot_cnt = dst_cnt;
if (flags & DMA_PREP_ZERO_P)
set_bit(PPC440SPE_ZERO_P, &op);
if (flags & DMA_PREP_ZERO_Q)
set_bit(PPC440SPE_ZERO_Q, &op);
if (test_bit(PPC440SPE_DESC_RXOR12, &op))
slot_cnt += src_cnt - 2;
else
slot_cnt += src_cnt - 3;
/* Thus we have either RXOR only chain or
* mixed RXOR/WXOR
*/
if (slot_cnt == dst_cnt)
/* RXOR only chain */
clear_bit(PPC440SPE_DESC_WXOR, &op);
}
spin_lock_bh(&ppc440spe_chan->lock);
/* for both RXOR/WXOR each descriptor occupies one slot */
sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1);
if (sw_desc) {
ppc440spe_desc_init_dma01pq(sw_desc, dst_cnt, src_cnt,
flags, op);
/* setup dst/src/mult */
pr_debug("%s: set dst descriptor 0, 1: 0x%016llx, 0x%016llx\n",
__func__, dst[0], dst[1]);
ppc440spe_adma_pq_set_dest(sw_desc, dst, flags);
while (src_cnt--) {
ppc440spe_adma_pq_set_src(sw_desc, src[src_cnt],
src_cnt);
/* NOTE: "Multi = 0 is equivalent to = 1" as it
* stated in 440SPSPe_RAID6_Addendum_UM_1_17.pdf
* doesn't work for RXOR with DMA0/1! Instead, multi=0
* leads to zeroing source data after RXOR.
* So, for P case set-up mult=1 explicitly.
*/
if (!(flags & DMA_PREP_PQ_DISABLE_Q))
mult = scf[src_cnt];
ppc440spe_adma_pq_set_src_mult(sw_desc,
mult, src_cnt, dst_cnt - 1);
}
/* Setup byte count foreach slot just allocated */
sw_desc->async_tx.flags = flags;
list_for_each_entry(iter, &sw_desc->group_list,
chain_node) {
ppc440spe_desc_set_byte_count(iter,
ppc440spe_chan, len);
iter->unmap_len = len;
}
}
spin_unlock_bh(&ppc440spe_chan->lock);
return sw_desc;
}
static struct ppc440spe_adma_desc_slot *ppc440spe_dma2_prep_pq(
struct ppc440spe_adma_chan *ppc440spe_chan,
dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt,
const unsigned char *scf, size_t len, unsigned long flags)
{
int slot_cnt, descs_per_op;
struct ppc440spe_adma_desc_slot *sw_desc = NULL, *iter;
unsigned long op = 0;
unsigned char mult = 1;
BUG_ON(!dst_cnt);
/*pr_debug("%s: dst_cnt %d, src_cnt %d, len %d\n",
__func__, dst_cnt, src_cnt, len);*/
spin_lock_bh(&ppc440spe_chan->lock);
descs_per_op = ppc440spe_dma2_pq_slot_count(src, src_cnt, len);
if (descs_per_op < 0) {
spin_unlock_bh(&ppc440spe_chan->lock);
return NULL;
}
/* depending on number of sources we have 1 or 2 RXOR chains */
slot_cnt = descs_per_op * dst_cnt;
sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1);
if (sw_desc) {
op = slot_cnt;
sw_desc->async_tx.flags = flags;
list_for_each_entry(iter, &sw_desc->group_list, chain_node) {
ppc440spe_desc_init_dma2pq(iter, dst_cnt, src_cnt,
--op ? 0 : flags);
ppc440spe_desc_set_byte_count(iter, ppc440spe_chan,
len);
iter->unmap_len = len;
ppc440spe_init_rxor_cursor(&(iter->rxor_cursor));
iter->rxor_cursor.len = len;
iter->descs_per_op = descs_per_op;
}
op = 0;
list_for_each_entry(iter, &sw_desc->group_list, chain_node) {
op++;
if (op % descs_per_op == 0)
ppc440spe_adma_init_dma2rxor_slot(iter, src,
src_cnt);
if (likely(!list_is_last(&iter->chain_node,
&sw_desc->group_list))) {
/* set 'next' pointer */
iter->hw_next =
list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
ppc440spe_xor_set_link(iter, iter->hw_next);
} else {
/* this is the last descriptor. */
iter->hw_next = NULL;
}
}
/* fixup head descriptor */
sw_desc->dst_cnt = dst_cnt;
if (flags & DMA_PREP_ZERO_P)
set_bit(PPC440SPE_ZERO_P, &sw_desc->flags);
if (flags & DMA_PREP_ZERO_Q)
set_bit(PPC440SPE_ZERO_Q, &sw_desc->flags);
/* setup dst/src/mult */
ppc440spe_adma_pq_set_dest(sw_desc, dst, flags);
while (src_cnt--) {
/* handle descriptors (if dst_cnt == 2) inside
* the ppc440spe_adma_pq_set_srcxxx() functions
*/
ppc440spe_adma_pq_set_src(sw_desc, src[src_cnt],
src_cnt);
if (!(flags & DMA_PREP_PQ_DISABLE_Q))
mult = scf[src_cnt];
ppc440spe_adma_pq_set_src_mult(sw_desc,
mult, src_cnt, dst_cnt - 1);
}
}
spin_unlock_bh(&ppc440spe_chan->lock);
ppc440spe_desc_set_rxor_block_size(len);
return sw_desc;
}
/**
* ppc440spe_adma_prep_dma_pq - prepare CDB (group) for a GF-XOR operation
*/
static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_pq(
struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf,
size_t len, unsigned long flags)
{
struct ppc440spe_adma_chan *ppc440spe_chan;
struct ppc440spe_adma_desc_slot *sw_desc = NULL;
int dst_cnt = 0;
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
ADMA_LL_DBG(prep_dma_pq_dbg(ppc440spe_chan->device->id,
dst, src, src_cnt));
BUG_ON(!len);
BUG_ON(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT);
BUG_ON(!src_cnt);
if (src_cnt == 1 && dst[1] == src[0]) {
dma_addr_t dest[2];
/* dst[1] is real destination (Q) */
dest[0] = dst[1];
/* this is the page to multicast source data to */
dest[1] = ppc440spe_chan->qdest;
sw_desc = ppc440spe_dma01_prep_mult(ppc440spe_chan,
dest, 2, src, src_cnt, scf, len, flags);
return sw_desc ? &sw_desc->async_tx : NULL;
}
if (src_cnt == 2 && dst[1] == src[1]) {
sw_desc = ppc440spe_dma01_prep_sum_product(ppc440spe_chan,
&dst[1], src, 2, scf, len, flags);
return sw_desc ? &sw_desc->async_tx : NULL;
}
if (!(flags & DMA_PREP_PQ_DISABLE_P)) {
BUG_ON(!dst[0]);
dst_cnt++;
flags |= DMA_PREP_ZERO_P;
}
if (!(flags & DMA_PREP_PQ_DISABLE_Q)) {
BUG_ON(!dst[1]);
dst_cnt++;
flags |= DMA_PREP_ZERO_Q;
}
BUG_ON(!dst_cnt);
dev_dbg(ppc440spe_chan->device->common.dev,
"ppc440spe adma%d: %s src_cnt: %d len: %u int_en: %d\n",
ppc440spe_chan->device->id, __func__, src_cnt, len,
flags & DMA_PREP_INTERRUPT ? 1 : 0);
switch (ppc440spe_chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
sw_desc = ppc440spe_dma01_prep_pq(ppc440spe_chan,
dst, dst_cnt, src, src_cnt, scf,
len, flags);
break;
case PPC440SPE_XOR_ID:
sw_desc = ppc440spe_dma2_prep_pq(ppc440spe_chan,
dst, dst_cnt, src, src_cnt, scf,
len, flags);
break;
}
return sw_desc ? &sw_desc->async_tx : NULL;
}
/**
* ppc440spe_adma_prep_dma_pqzero_sum - prepare CDB group for
* a PQ_ZERO_SUM operation
*/
static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_pqzero_sum(
struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf, size_t len,
enum sum_check_flags *pqres, unsigned long flags)
{
struct ppc440spe_adma_chan *ppc440spe_chan;
struct ppc440spe_adma_desc_slot *sw_desc, *iter;
dma_addr_t pdest, qdest;
int slot_cnt, slots_per_op, idst, dst_cnt;
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
if (flags & DMA_PREP_PQ_DISABLE_P)
pdest = 0;
else
pdest = pq[0];
if (flags & DMA_PREP_PQ_DISABLE_Q)
qdest = 0;
else
qdest = pq[1];
ADMA_LL_DBG(prep_dma_pqzero_sum_dbg(ppc440spe_chan->device->id,
src, src_cnt, scf));
/* Always use WXOR for P/Q calculations (two destinations).
* Need 1 or 2 extra slots to verify results are zero.
*/
idst = dst_cnt = (pdest && qdest) ? 2 : 1;
/* One additional slot per destination to clone P/Q
* before calculation (we have to preserve destinations).
*/
slot_cnt = src_cnt + dst_cnt * 2;
slots_per_op = 1;
spin_lock_bh(&ppc440spe_chan->lock);
sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt,
slots_per_op);
if (sw_desc) {
ppc440spe_desc_init_dma01pqzero_sum(sw_desc, dst_cnt, src_cnt);
/* Setup byte count for each slot just allocated */
sw_desc->async_tx.flags = flags;
list_for_each_entry(iter, &sw_desc->group_list, chain_node) {
ppc440spe_desc_set_byte_count(iter, ppc440spe_chan,
len);
iter->unmap_len = len;
}
if (pdest) {
struct dma_cdb *hw_desc;
struct ppc440spe_adma_chan *chan;
iter = sw_desc->group_head;
chan = to_ppc440spe_adma_chan(iter->async_tx.chan);
memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
iter->hw_next = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
iter->src_cnt = 0;
iter->dst_cnt = 0;
ppc440spe_desc_set_dest_addr(iter, chan, 0,
ppc440spe_chan->pdest, 0);
ppc440spe_desc_set_src_addr(iter, chan, 0, 0, pdest);
ppc440spe_desc_set_byte_count(iter, ppc440spe_chan,
len);
iter->unmap_len = 0;
/* override pdest to preserve original P */
pdest = ppc440spe_chan->pdest;
}
if (qdest) {
struct dma_cdb *hw_desc;
struct ppc440spe_adma_chan *chan;
iter = list_first_entry(&sw_desc->group_list,
struct ppc440spe_adma_desc_slot,
chain_node);
chan = to_ppc440spe_adma_chan(iter->async_tx.chan);
if (pdest) {
iter = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
}
memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
iter->hw_next = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
hw_desc = iter->hw_desc;
hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
iter->src_cnt = 0;
iter->dst_cnt = 0;
ppc440spe_desc_set_dest_addr(iter, chan, 0,
ppc440spe_chan->qdest, 0);
ppc440spe_desc_set_src_addr(iter, chan, 0, 0, qdest);
ppc440spe_desc_set_byte_count(iter, ppc440spe_chan,
len);
iter->unmap_len = 0;
/* override qdest to preserve original Q */
qdest = ppc440spe_chan->qdest;
}
/* Setup destinations for P/Q ops */
ppc440spe_adma_pqzero_sum_set_dest(sw_desc, pdest, qdest);
/* Setup zero QWORDs into DCHECK CDBs */
idst = dst_cnt;
list_for_each_entry_reverse(iter, &sw_desc->group_list,
chain_node) {
/*
* The last CDB corresponds to Q-parity check,
* the one before last CDB corresponds
* P-parity check
*/
if (idst == DMA_DEST_MAX_NUM) {
if (idst == dst_cnt) {
set_bit(PPC440SPE_DESC_QCHECK,
&iter->flags);
} else {
set_bit(PPC440SPE_DESC_PCHECK,
&iter->flags);
}
} else {
if (qdest) {
set_bit(PPC440SPE_DESC_QCHECK,
&iter->flags);
} else {
set_bit(PPC440SPE_DESC_PCHECK,
&iter->flags);
}
}
iter->xor_check_result = pqres;
/*
* set it to zero, if check fail then result will
* be updated
*/
*iter->xor_check_result = 0;
ppc440spe_desc_set_dcheck(iter, ppc440spe_chan,
ppc440spe_qword);
if (!(--dst_cnt))
break;
}
/* Setup sources and mults for P/Q ops */
list_for_each_entry_continue_reverse(iter, &sw_desc->group_list,
chain_node) {
struct ppc440spe_adma_chan *chan;
u32 mult_dst;
chan = to_ppc440spe_adma_chan(iter->async_tx.chan);
ppc440spe_desc_set_src_addr(iter, chan, 0,
DMA_CUED_XOR_HB,
src[src_cnt - 1]);
if (qdest) {
mult_dst = (dst_cnt - 1) ? DMA_CDB_SG_DST2 :
DMA_CDB_SG_DST1;
ppc440spe_desc_set_src_mult(iter, chan,
DMA_CUED_MULT1_OFF,
mult_dst,
scf[src_cnt - 1]);
}
if (!(--src_cnt))
break;
}
}
spin_unlock_bh(&ppc440spe_chan->lock);
return sw_desc ? &sw_desc->async_tx : NULL;
}
/**
* ppc440spe_adma_prep_dma_xor_zero_sum - prepare CDB group for
* XOR ZERO_SUM operation
*/
static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor_zero_sum(
struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt,
size_t len, enum sum_check_flags *result, unsigned long flags)
{
struct dma_async_tx_descriptor *tx;
dma_addr_t pq[2];
/* validate P, disable Q */
pq[0] = src[0];
pq[1] = 0;
flags |= DMA_PREP_PQ_DISABLE_Q;
tx = ppc440spe_adma_prep_dma_pqzero_sum(chan, pq, &src[1],
src_cnt - 1, 0, len,
result, flags);
return tx;
}
/**
* ppc440spe_adma_set_dest - set destination address into descriptor
*/
static void ppc440spe_adma_set_dest(struct ppc440spe_adma_desc_slot *sw_desc,
dma_addr_t addr, int index)
{
struct ppc440spe_adma_chan *chan;
BUG_ON(index >= sw_desc->dst_cnt);
chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan);
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
/* to do: support transfers lengths >
* PPC440SPE_ADMA_DMA/XOR_MAX_BYTE_COUNT
*/
ppc440spe_desc_set_dest_addr(sw_desc->group_head,
chan, 0, addr, index);
break;
case PPC440SPE_XOR_ID:
sw_desc = ppc440spe_get_group_entry(sw_desc, index);
ppc440spe_desc_set_dest_addr(sw_desc,
chan, 0, addr, index);
break;
}
}
static void ppc440spe_adma_pq_zero_op(struct ppc440spe_adma_desc_slot *iter,
struct ppc440spe_adma_chan *chan, dma_addr_t addr)
{
/* To clear destinations update the descriptor
* (P or Q depending on index) as follows:
* addr is destination (0 corresponds to SG2):
*/
ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, addr, 0);
/* ... and the addr is source: */
ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, addr);
/* addr is always SG2 then the mult is always DST1 */
ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF,
DMA_CDB_SG_DST1, 1);
}
/**
* ppc440spe_adma_pq_set_dest - set destination address into descriptor
* for the PQXOR operation
*/
static void ppc440spe_adma_pq_set_dest(struct ppc440spe_adma_desc_slot *sw_desc,
dma_addr_t *addrs, unsigned long flags)
{
struct ppc440spe_adma_desc_slot *iter;
struct ppc440spe_adma_chan *chan;
dma_addr_t paddr, qaddr;
dma_addr_t addr = 0, ppath, qpath;
int index = 0, i;
chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan);
if (flags & DMA_PREP_PQ_DISABLE_P)
paddr = 0;
else
paddr = addrs[0];
if (flags & DMA_PREP_PQ_DISABLE_Q)
qaddr = 0;
else
qaddr = addrs[1];
if (!paddr || !qaddr)
addr = paddr ? paddr : qaddr;
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
/* walk through the WXOR source list and set P/Q-destinations
* for each slot:
*/
if (!test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) {
/* This is WXOR-only chain; may have 1/2 zero descs */
if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags))
index++;
if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags))
index++;
iter = ppc440spe_get_group_entry(sw_desc, index);
if (addr) {
/* one destination */
list_for_each_entry_from(iter,
&sw_desc->group_list, chain_node)
ppc440spe_desc_set_dest_addr(iter, chan,
DMA_CUED_XOR_BASE, addr, 0);
} else {
/* two destinations */
list_for_each_entry_from(iter,
&sw_desc->group_list, chain_node) {
ppc440spe_desc_set_dest_addr(iter, chan,
DMA_CUED_XOR_BASE, paddr, 0);
ppc440spe_desc_set_dest_addr(iter, chan,
DMA_CUED_XOR_BASE, qaddr, 1);
}
}
if (index) {
/* To clear destinations update the descriptor
* (1st,2nd, or both depending on flags)
*/
index = 0;
if (test_bit(PPC440SPE_ZERO_P,
&sw_desc->flags)) {
iter = ppc440spe_get_group_entry(
sw_desc, index++);
ppc440spe_adma_pq_zero_op(iter, chan,
paddr);
}
if (test_bit(PPC440SPE_ZERO_Q,
&sw_desc->flags)) {
iter = ppc440spe_get_group_entry(
sw_desc, index++);
ppc440spe_adma_pq_zero_op(iter, chan,
qaddr);
}
return;
}
} else {
/* This is RXOR-only or RXOR/WXOR mixed chain */
/* If we want to include destination into calculations,
* then make dest addresses cued with mult=1 (XOR).
*/
ppath = test_bit(PPC440SPE_ZERO_P, &sw_desc->flags) ?
DMA_CUED_XOR_HB :
DMA_CUED_XOR_BASE |
(1 << DMA_CUED_MULT1_OFF);
qpath = test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags) ?
DMA_CUED_XOR_HB :
DMA_CUED_XOR_BASE |
(1 << DMA_CUED_MULT1_OFF);
/* Setup destination(s) in RXOR slot(s) */
iter = ppc440spe_get_group_entry(sw_desc, index++);
ppc440spe_desc_set_dest_addr(iter, chan,
paddr ? ppath : qpath,
paddr ? paddr : qaddr, 0);
if (!addr) {
/* two destinations */
iter = ppc440spe_get_group_entry(sw_desc,
index++);
ppc440spe_desc_set_dest_addr(iter, chan,
qpath, qaddr, 0);
}
if (test_bit(PPC440SPE_DESC_WXOR, &sw_desc->flags)) {
/* Setup destination(s) in remaining WXOR
* slots
*/
iter = ppc440spe_get_group_entry(sw_desc,
index);
if (addr) {
/* one destination */
list_for_each_entry_from(iter,
&sw_desc->group_list,
chain_node)
ppc440spe_desc_set_dest_addr(
iter, chan,
DMA_CUED_XOR_BASE,
addr, 0);
} else {
/* two destinations */
list_for_each_entry_from(iter,
&sw_desc->group_list,
chain_node) {
ppc440spe_desc_set_dest_addr(
iter, chan,
DMA_CUED_XOR_BASE,
paddr, 0);
ppc440spe_desc_set_dest_addr(
iter, chan,
DMA_CUED_XOR_BASE,
qaddr, 1);
}
}
}
}
break;
case PPC440SPE_XOR_ID:
/* DMA2 descriptors have only 1 destination, so there are
* two chains - one for each dest.
* If we want to include destination into calculations,
* then make dest addresses cued with mult=1 (XOR).
*/
ppath = test_bit(PPC440SPE_ZERO_P, &sw_desc->flags) ?
DMA_CUED_XOR_HB :
DMA_CUED_XOR_BASE |
(1 << DMA_CUED_MULT1_OFF);
qpath = test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags) ?
DMA_CUED_XOR_HB :
DMA_CUED_XOR_BASE |
(1 << DMA_CUED_MULT1_OFF);
iter = ppc440spe_get_group_entry(sw_desc, 0);
for (i = 0; i < sw_desc->descs_per_op; i++) {
ppc440spe_desc_set_dest_addr(iter, chan,
paddr ? ppath : qpath,
paddr ? paddr : qaddr, 0);
iter = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
}
if (!addr) {
/* Two destinations; setup Q here */
iter = ppc440spe_get_group_entry(sw_desc,
sw_desc->descs_per_op);
for (i = 0; i < sw_desc->descs_per_op; i++) {
ppc440spe_desc_set_dest_addr(iter,
chan, qpath, qaddr, 0);
iter = list_entry(iter->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
}
}
break;
}
}
/**
* ppc440spe_adma_pq_zero_sum_set_dest - set destination address into descriptor
* for the PQ_ZERO_SUM operation
*/
static void ppc440spe_adma_pqzero_sum_set_dest(
struct ppc440spe_adma_desc_slot *sw_desc,
dma_addr_t paddr, dma_addr_t qaddr)
{
struct ppc440spe_adma_desc_slot *iter, *end;
struct ppc440spe_adma_chan *chan;
dma_addr_t addr = 0;
int idx;
chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan);
/* walk through the WXOR source list and set P/Q-destinations
* for each slot
*/
idx = (paddr && qaddr) ? 2 : 1;
/* set end */
list_for_each_entry_reverse(end, &sw_desc->group_list,
chain_node) {
if (!(--idx))
break;
}
/* set start */
idx = (paddr && qaddr) ? 2 : 1;
iter = ppc440spe_get_group_entry(sw_desc, idx);
if (paddr && qaddr) {
/* two destinations */
list_for_each_entry_from(iter, &sw_desc->group_list,
chain_node) {
if (unlikely(iter == end))
break;
ppc440spe_desc_set_dest_addr(iter, chan,
DMA_CUED_XOR_BASE, paddr, 0);
ppc440spe_desc_set_dest_addr(iter, chan,
DMA_CUED_XOR_BASE, qaddr, 1);
}
} else {
/* one destination */
addr = paddr ? paddr : qaddr;
list_for_each_entry_from(iter, &sw_desc->group_list,
chain_node) {
if (unlikely(iter == end))
break;
ppc440spe_desc_set_dest_addr(iter, chan,
DMA_CUED_XOR_BASE, addr, 0);
}
}
/* The remaining descriptors are DATACHECK. These have no need in
* destination. Actually, these destinations are used there
* as sources for check operation. So, set addr as source.
*/
ppc440spe_desc_set_src_addr(end, chan, 0, 0, addr ? addr : paddr);
if (!addr) {
end = list_entry(end->chain_node.next,
struct ppc440spe_adma_desc_slot, chain_node);
ppc440spe_desc_set_src_addr(end, chan, 0, 0, qaddr);
}
}
/**
* ppc440spe_desc_set_xor_src_cnt - set source count into descriptor
*/
static inline void ppc440spe_desc_set_xor_src_cnt(
struct ppc440spe_adma_desc_slot *desc,
int src_cnt)
{
struct xor_cb *hw_desc = desc->hw_desc;
hw_desc->cbc &= ~XOR_CDCR_OAC_MSK;
hw_desc->cbc |= src_cnt;
}
/**
* ppc440spe_adma_pq_set_src - set source address into descriptor
*/
static void ppc440spe_adma_pq_set_src(struct ppc440spe_adma_desc_slot *sw_desc,
dma_addr_t addr, int index)
{
struct ppc440spe_adma_chan *chan;
dma_addr_t haddr = 0;
struct ppc440spe_adma_desc_slot *iter = NULL;
chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan);
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
/* DMA0,1 may do: WXOR, RXOR, RXOR+WXORs chain
*/
if (test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) {
/* RXOR-only or RXOR/WXOR operation */
int iskip = test_bit(PPC440SPE_DESC_RXOR12,
&sw_desc->flags) ? 2 : 3;
if (index == 0) {
/* 1st slot (RXOR) */
/* setup sources region (R1-2-3, R1-2-4,
* or R1-2-5)
*/
if (test_bit(PPC440SPE_DESC_RXOR12,
&sw_desc->flags))
haddr = DMA_RXOR12 <<
DMA_CUED_REGION_OFF;
else if (test_bit(PPC440SPE_DESC_RXOR123,
&sw_desc->flags))
haddr = DMA_RXOR123 <<
DMA_CUED_REGION_OFF;
else if (test_bit(PPC440SPE_DESC_RXOR124,
&sw_desc->flags))
haddr = DMA_RXOR124 <<
DMA_CUED_REGION_OFF;
else if (test_bit(PPC440SPE_DESC_RXOR125,
&sw_desc->flags))
haddr = DMA_RXOR125 <<
DMA_CUED_REGION_OFF;
else
BUG();
haddr |= DMA_CUED_XOR_BASE;
iter = ppc440spe_get_group_entry(sw_desc, 0);
} else if (index < iskip) {
/* 1st slot (RXOR)
* shall actually set source address only once
* instead of first <iskip>
*/
iter = NULL;
} else {
/* 2nd/3d and next slots (WXOR);
* skip first slot with RXOR
*/
haddr = DMA_CUED_XOR_HB;
iter = ppc440spe_get_group_entry(sw_desc,
index - iskip + sw_desc->dst_cnt);
}
} else {
int znum = 0;
/* WXOR-only operation; skip first slots with
* zeroing destinations
*/
if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags))
znum++;
if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags))
znum++;
haddr = DMA_CUED_XOR_HB;
iter = ppc440spe_get_group_entry(sw_desc,
index + znum);
}
if (likely(iter)) {
ppc440spe_desc_set_src_addr(iter, chan, 0, haddr, addr);
if (!index &&
test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags) &&
sw_desc->dst_cnt == 2) {
/* if we have two destinations for RXOR, then
* setup source in the second descr too
*/
iter = ppc440spe_get_group_entry(sw_desc, 1);
ppc440spe_desc_set_src_addr(iter, chan, 0,
haddr, addr);
}
}
break;
case PPC440SPE_XOR_ID:
/* DMA2 may do Biskup */
iter = sw_desc->group_head;
if (iter->dst_cnt == 2) {
/* both P & Q calculations required; set P src here */
ppc440spe_adma_dma2rxor_set_src(iter, index, addr);
/* this is for Q */
iter = ppc440spe_get_group_entry(sw_desc,
sw_desc->descs_per_op);
}
ppc440spe_adma_dma2rxor_set_src(iter, index, addr);
break;
}
}
/**
* ppc440spe_adma_memcpy_xor_set_src - set source address into descriptor
*/
static void ppc440spe_adma_memcpy_xor_set_src(
struct ppc440spe_adma_desc_slot *sw_desc,
dma_addr_t addr, int index)
{
struct ppc440spe_adma_chan *chan;
chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan);
sw_desc = sw_desc->group_head;
if (likely(sw_desc))
ppc440spe_desc_set_src_addr(sw_desc, chan, index, 0, addr);
}
/**
* ppc440spe_adma_dma2rxor_inc_addr -
*/
static void ppc440spe_adma_dma2rxor_inc_addr(
struct ppc440spe_adma_desc_slot *desc,
struct ppc440spe_rxor *cursor, int index, int src_cnt)
{
cursor->addr_count++;
if (index == src_cnt - 1) {
ppc440spe_desc_set_xor_src_cnt(desc, cursor->addr_count);
} else if (cursor->addr_count == XOR_MAX_OPS) {
ppc440spe_desc_set_xor_src_cnt(desc, cursor->addr_count);
cursor->addr_count = 0;
cursor->desc_count++;
}
}
/**
* ppc440spe_adma_dma2rxor_prep_src - setup RXOR types in DMA2 CDB
*/
static int ppc440spe_adma_dma2rxor_prep_src(
struct ppc440spe_adma_desc_slot *hdesc,
struct ppc440spe_rxor *cursor, int index,
int src_cnt, u32 addr)
{
u32 sign;
struct ppc440spe_adma_desc_slot *desc = hdesc;
int i;
for (i = 0; i < cursor->desc_count; i++) {
desc = list_entry(hdesc->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
}
switch (cursor->state) {
case 0:
if (addr == cursor->addrl + cursor->len) {
/* direct RXOR */
cursor->state = 1;
cursor->xor_count++;
if (index == src_cnt-1) {
ppc440spe_rxor_set_region(desc,
cursor->addr_count,
DMA_RXOR12 << DMA_CUED_REGION_OFF);
ppc440spe_adma_dma2rxor_inc_addr(
desc, cursor, index, src_cnt);
}
} else if (cursor->addrl == addr + cursor->len) {
/* reverse RXOR */
cursor->state = 1;
cursor->xor_count++;
set_bit(cursor->addr_count, &desc->reverse_flags[0]);
if (index == src_cnt-1) {
ppc440spe_rxor_set_region(desc,
cursor->addr_count,
DMA_RXOR12 << DMA_CUED_REGION_OFF);
ppc440spe_adma_dma2rxor_inc_addr(
desc, cursor, index, src_cnt);
}
} else {
printk(KERN_ERR "Cannot build "
"DMA2 RXOR command block.\n");
BUG();
}
break;
case 1:
sign = test_bit(cursor->addr_count,
desc->reverse_flags)
? -1 : 1;
if (index == src_cnt-2 || (sign == -1
&& addr != cursor->addrl - 2*cursor->len)) {
cursor->state = 0;
cursor->xor_count = 1;
cursor->addrl = addr;
ppc440spe_rxor_set_region(desc,
cursor->addr_count,
DMA_RXOR12 << DMA_CUED_REGION_OFF);
ppc440spe_adma_dma2rxor_inc_addr(
desc, cursor, index, src_cnt);
} else if (addr == cursor->addrl + 2*sign*cursor->len) {
cursor->state = 2;
cursor->xor_count = 0;
ppc440spe_rxor_set_region(desc,
cursor->addr_count,
DMA_RXOR123 << DMA_CUED_REGION_OFF);
if (index == src_cnt-1) {
ppc440spe_adma_dma2rxor_inc_addr(
desc, cursor, index, src_cnt);
}
} else if (addr == cursor->addrl + 3*cursor->len) {
cursor->state = 2;
cursor->xor_count = 0;
ppc440spe_rxor_set_region(desc,
cursor->addr_count,
DMA_RXOR124 << DMA_CUED_REGION_OFF);
if (index == src_cnt-1) {
ppc440spe_adma_dma2rxor_inc_addr(
desc, cursor, index, src_cnt);
}
} else if (addr == cursor->addrl + 4*cursor->len) {
cursor->state = 2;
cursor->xor_count = 0;
ppc440spe_rxor_set_region(desc,
cursor->addr_count,
DMA_RXOR125 << DMA_CUED_REGION_OFF);
if (index == src_cnt-1) {
ppc440spe_adma_dma2rxor_inc_addr(
desc, cursor, index, src_cnt);
}
} else {
cursor->state = 0;
cursor->xor_count = 1;
cursor->addrl = addr;
ppc440spe_rxor_set_region(desc,
cursor->addr_count,
DMA_RXOR12 << DMA_CUED_REGION_OFF);
ppc440spe_adma_dma2rxor_inc_addr(
desc, cursor, index, src_cnt);
}
break;
case 2:
cursor->state = 0;
cursor->addrl = addr;
cursor->xor_count++;
if (index) {
ppc440spe_adma_dma2rxor_inc_addr(
desc, cursor, index, src_cnt);
}
break;
}
return 0;
}
/**
* ppc440spe_adma_dma2rxor_set_src - set RXOR source address; it's assumed that
* ppc440spe_adma_dma2rxor_prep_src() has already done prior this call
*/
static void ppc440spe_adma_dma2rxor_set_src(
struct ppc440spe_adma_desc_slot *desc,
int index, dma_addr_t addr)
{
struct xor_cb *xcb = desc->hw_desc;
int k = 0, op = 0, lop = 0;
/* get the RXOR operand which corresponds to index addr */
while (op <= index) {
lop = op;
if (k == XOR_MAX_OPS) {
k = 0;
desc = list_entry(desc->chain_node.next,
struct ppc440spe_adma_desc_slot, chain_node);
xcb = desc->hw_desc;
}
if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) ==
(DMA_RXOR12 << DMA_CUED_REGION_OFF))
op += 2;
else
op += 3;
}
BUG_ON(k < 1);
if (test_bit(k-1, desc->reverse_flags)) {
/* reverse operand order; put last op in RXOR group */
if (index == op - 1)
ppc440spe_rxor_set_src(desc, k - 1, addr);
} else {
/* direct operand order; put first op in RXOR group */
if (index == lop)
ppc440spe_rxor_set_src(desc, k - 1, addr);
}
}
/**
* ppc440spe_adma_dma2rxor_set_mult - set RXOR multipliers; it's assumed that
* ppc440spe_adma_dma2rxor_prep_src() has already done prior this call
*/
static void ppc440spe_adma_dma2rxor_set_mult(
struct ppc440spe_adma_desc_slot *desc,
int index, u8 mult)
{
struct xor_cb *xcb = desc->hw_desc;
int k = 0, op = 0, lop = 0;
/* get the RXOR operand which corresponds to index mult */
while (op <= index) {
lop = op;
if (k == XOR_MAX_OPS) {
k = 0;
desc = list_entry(desc->chain_node.next,
struct ppc440spe_adma_desc_slot,
chain_node);
xcb = desc->hw_desc;
}
if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) ==
(DMA_RXOR12 << DMA_CUED_REGION_OFF))
op += 2;
else
op += 3;
}
BUG_ON(k < 1);
if (test_bit(k-1, desc->reverse_flags)) {
/* reverse order */
ppc440spe_rxor_set_mult(desc, k - 1, op - index - 1, mult);
} else {
/* direct order */
ppc440spe_rxor_set_mult(desc, k - 1, index - lop, mult);
}
}
/**
* ppc440spe_init_rxor_cursor -
*/
static void ppc440spe_init_rxor_cursor(struct ppc440spe_rxor *cursor)
{
memset(cursor, 0, sizeof(struct ppc440spe_rxor));
cursor->state = 2;
}
/**
* ppc440spe_adma_pq_set_src_mult - set multiplication coefficient into
* descriptor for the PQXOR operation
*/
static void ppc440spe_adma_pq_set_src_mult(
struct ppc440spe_adma_desc_slot *sw_desc,
unsigned char mult, int index, int dst_pos)
{
struct ppc440spe_adma_chan *chan;
u32 mult_idx, mult_dst;
struct ppc440spe_adma_desc_slot *iter = NULL, *iter1 = NULL;
chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan);
switch (chan->device->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
if (test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) {
int region = test_bit(PPC440SPE_DESC_RXOR12,
&sw_desc->flags) ? 2 : 3;
if (index < region) {
/* RXOR multipliers */
iter = ppc440spe_get_group_entry(sw_desc,
sw_desc->dst_cnt - 1);
if (sw_desc->dst_cnt == 2)
iter1 = ppc440spe_get_group_entry(
sw_desc, 0);
mult_idx = DMA_CUED_MULT1_OFF + (index << 3);
mult_dst = DMA_CDB_SG_SRC;
} else {
/* WXOR multiplier */
iter = ppc440spe_get_group_entry(sw_desc,
index - region +
sw_desc->dst_cnt);
mult_idx = DMA_CUED_MULT1_OFF;
mult_dst = dst_pos ? DMA_CDB_SG_DST2 :
DMA_CDB_SG_DST1;
}
} else {
int znum = 0;
/* WXOR-only;
* skip first slots with destinations (if ZERO_DST has
* place)
*/
if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags))
znum++;
if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags))
znum++;
iter = ppc440spe_get_group_entry(sw_desc, index + znum);
mult_idx = DMA_CUED_MULT1_OFF;
mult_dst = dst_pos ? DMA_CDB_SG_DST2 : DMA_CDB_SG_DST1;
}
if (likely(iter)) {
ppc440spe_desc_set_src_mult(iter, chan,
mult_idx, mult_dst, mult);
if (unlikely(iter1)) {
/* if we have two destinations for RXOR, then
* we've just set Q mult. Set-up P now.
*/
ppc440spe_desc_set_src_mult(iter1, chan,
mult_idx, mult_dst, 1);
}
}
break;
case PPC440SPE_XOR_ID:
iter = sw_desc->group_head;
if (sw_desc->dst_cnt == 2) {
/* both P & Q calculations required; set P mult here */
ppc440spe_adma_dma2rxor_set_mult(iter, index, 1);
/* and then set Q mult */
iter = ppc440spe_get_group_entry(sw_desc,
sw_desc->descs_per_op);
}
ppc440spe_adma_dma2rxor_set_mult(iter, index, mult);
break;
}
}
/**
* ppc440spe_adma_free_chan_resources - free the resources allocated
*/
static void ppc440spe_adma_free_chan_resources(struct dma_chan *chan)
{
struct ppc440spe_adma_chan *ppc440spe_chan;
struct ppc440spe_adma_desc_slot *iter, *_iter;
int in_use_descs = 0;
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
ppc440spe_adma_slot_cleanup(ppc440spe_chan);
spin_lock_bh(&ppc440spe_chan->lock);
list_for_each_entry_safe(iter, _iter, &ppc440spe_chan->chain,
chain_node) {
in_use_descs++;
list_del(&iter->chain_node);
}
list_for_each_entry_safe_reverse(iter, _iter,
&ppc440spe_chan->all_slots, slot_node) {
list_del(&iter->slot_node);
kfree(iter);
ppc440spe_chan->slots_allocated--;
}
ppc440spe_chan->last_used = NULL;
dev_dbg(ppc440spe_chan->device->common.dev,
"ppc440spe adma%d %s slots_allocated %d\n",
ppc440spe_chan->device->id,
__func__, ppc440spe_chan->slots_allocated);
spin_unlock_bh(&ppc440spe_chan->lock);
/* one is ok since we left it on there on purpose */
if (in_use_descs > 1)
printk(KERN_ERR "SPE: Freeing %d in use descriptors!\n",
in_use_descs - 1);
}
/**
* ppc440spe_adma_tx_status - poll the status of an ADMA transaction
* @chan: ADMA channel handle
* @cookie: ADMA transaction identifier
* @txstate: a holder for the current state of the channel
*/
static enum dma_status ppc440spe_adma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct ppc440spe_adma_chan *ppc440spe_chan;
enum dma_status ret;
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
ppc440spe_adma_slot_cleanup(ppc440spe_chan);
return dma_cookie_status(chan, cookie, txstate);
}
/**
* ppc440spe_adma_eot_handler - end of transfer interrupt handler
*/
static irqreturn_t ppc440spe_adma_eot_handler(int irq, void *data)
{
struct ppc440spe_adma_chan *chan = data;
dev_dbg(chan->device->common.dev,
"ppc440spe adma%d: %s\n", chan->device->id, __func__);
tasklet_schedule(&chan->irq_tasklet);
ppc440spe_adma_device_clear_eot_status(chan);
return IRQ_HANDLED;
}
/**
* ppc440spe_adma_err_handler - DMA error interrupt handler;
* do the same things as a eot handler
*/
static irqreturn_t ppc440spe_adma_err_handler(int irq, void *data)
{
struct ppc440spe_adma_chan *chan = data;
dev_dbg(chan->device->common.dev,
"ppc440spe adma%d: %s\n", chan->device->id, __func__);
tasklet_schedule(&chan->irq_tasklet);
ppc440spe_adma_device_clear_eot_status(chan);
return IRQ_HANDLED;
}
/**
* ppc440spe_test_callback - called when test operation has been done
*/
static void ppc440spe_test_callback(void *unused)
{
complete(&ppc440spe_r6_test_comp);
}
/**
* ppc440spe_adma_issue_pending - flush all pending descriptors to h/w
*/
static void ppc440spe_adma_issue_pending(struct dma_chan *chan)
{
struct ppc440spe_adma_chan *ppc440spe_chan;
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
dev_dbg(ppc440spe_chan->device->common.dev,
"ppc440spe adma%d: %s %d \n", ppc440spe_chan->device->id,
__func__, ppc440spe_chan->pending);
if (ppc440spe_chan->pending) {
ppc440spe_chan->pending = 0;
ppc440spe_chan_append(ppc440spe_chan);
}
}
/**
* ppc440spe_chan_start_null_xor - initiate the first XOR operation (DMA engines
* use FIFOs (as opposite to chains used in XOR) so this is a XOR
* specific operation)
*/
static void ppc440spe_chan_start_null_xor(struct ppc440spe_adma_chan *chan)
{
struct ppc440spe_adma_desc_slot *sw_desc, *group_start;
dma_cookie_t cookie;
int slot_cnt, slots_per_op;
dev_dbg(chan->device->common.dev,
"ppc440spe adma%d: %s\n", chan->device->id, __func__);
spin_lock_bh(&chan->lock);
slot_cnt = ppc440spe_chan_xor_slot_count(0, 2, &slots_per_op);
sw_desc = ppc440spe_adma_alloc_slots(chan, slot_cnt, slots_per_op);
if (sw_desc) {
group_start = sw_desc->group_head;
list_splice_init(&sw_desc->group_list, &chan->chain);
async_tx_ack(&sw_desc->async_tx);
ppc440spe_desc_init_null_xor(group_start);
cookie = dma_cookie_assign(&sw_desc->async_tx);
/* initialize the completed cookie to be less than
* the most recently used cookie
*/
chan->common.completed_cookie = cookie - 1;
/* channel should not be busy */
BUG_ON(ppc440spe_chan_is_busy(chan));
/* set the descriptor address */
ppc440spe_chan_set_first_xor_descriptor(chan, sw_desc);
/* run the descriptor */
ppc440spe_chan_run(chan);
} else
printk(KERN_ERR "ppc440spe adma%d"
" failed to allocate null descriptor\n",
chan->device->id);
spin_unlock_bh(&chan->lock);
}
/**
* ppc440spe_test_raid6 - test are RAID-6 capabilities enabled successfully.
* For this we just perform one WXOR operation with the same source
* and destination addresses, the GF-multiplier is 1; so if RAID-6
* capabilities are enabled then we'll get src/dst filled with zero.
*/
static int ppc440spe_test_raid6(struct ppc440spe_adma_chan *chan)
{
struct ppc440spe_adma_desc_slot *sw_desc, *iter;
struct page *pg;
char *a;
dma_addr_t dma_addr, addrs[2];
unsigned long op = 0;
int rval = 0;
set_bit(PPC440SPE_DESC_WXOR, &op);
pg = alloc_page(GFP_KERNEL);
if (!pg)
return -ENOMEM;
spin_lock_bh(&chan->lock);
sw_desc = ppc440spe_adma_alloc_slots(chan, 1, 1);
if (sw_desc) {
/* 1 src, 1 dsr, int_ena, WXOR */
ppc440spe_desc_init_dma01pq(sw_desc, 1, 1, 1, op);
list_for_each_entry(iter, &sw_desc->group_list, chain_node) {
ppc440spe_desc_set_byte_count(iter, chan, PAGE_SIZE);
iter->unmap_len = PAGE_SIZE;
}
} else {
rval = -EFAULT;
spin_unlock_bh(&chan->lock);
goto exit;
}
spin_unlock_bh(&chan->lock);
/* Fill the test page with ones */
memset(page_address(pg), 0xFF, PAGE_SIZE);
dma_addr = dma_map_page(chan->device->dev, pg, 0,
PAGE_SIZE, DMA_BIDIRECTIONAL);
/* Setup addresses */
ppc440spe_adma_pq_set_src(sw_desc, dma_addr, 0);
ppc440spe_adma_pq_set_src_mult(sw_desc, 1, 0, 0);
addrs[0] = dma_addr;
addrs[1] = 0;
ppc440spe_adma_pq_set_dest(sw_desc, addrs, DMA_PREP_PQ_DISABLE_Q);
async_tx_ack(&sw_desc->async_tx);
sw_desc->async_tx.callback = ppc440spe_test_callback;
sw_desc->async_tx.callback_param = NULL;
init_completion(&ppc440spe_r6_test_comp);
ppc440spe_adma_tx_submit(&sw_desc->async_tx);
ppc440spe_adma_issue_pending(&chan->common);
wait_for_completion(&ppc440spe_r6_test_comp);
/* Now check if the test page is zeroed */
a = page_address(pg);
if ((*(u32 *)a) == 0 && memcmp(a, a+4, PAGE_SIZE-4) == 0) {
/* page is zero - RAID-6 enabled */
rval = 0;
} else {
/* RAID-6 was not enabled */
rval = -EINVAL;
}
exit:
__free_page(pg);
return rval;
}
static void ppc440spe_adma_init_capabilities(struct ppc440spe_adma_device *adev)
{
switch (adev->id) {
case PPC440SPE_DMA0_ID:
case PPC440SPE_DMA1_ID:
dma_cap_set(DMA_MEMCPY, adev->common.cap_mask);
dma_cap_set(DMA_INTERRUPT, adev->common.cap_mask);
dma_cap_set(DMA_PQ, adev->common.cap_mask);
dma_cap_set(DMA_PQ_VAL, adev->common.cap_mask);
dma_cap_set(DMA_XOR_VAL, adev->common.cap_mask);
break;
case PPC440SPE_XOR_ID:
dma_cap_set(DMA_XOR, adev->common.cap_mask);
dma_cap_set(DMA_PQ, adev->common.cap_mask);
dma_cap_set(DMA_INTERRUPT, adev->common.cap_mask);
adev->common.cap_mask = adev->common.cap_mask;
break;
}
/* Set base routines */
adev->common.device_alloc_chan_resources =
ppc440spe_adma_alloc_chan_resources;
adev->common.device_free_chan_resources =
ppc440spe_adma_free_chan_resources;
adev->common.device_tx_status = ppc440spe_adma_tx_status;
adev->common.device_issue_pending = ppc440spe_adma_issue_pending;
/* Set prep routines based on capability */
if (dma_has_cap(DMA_MEMCPY, adev->common.cap_mask)) {
adev->common.device_prep_dma_memcpy =
ppc440spe_adma_prep_dma_memcpy;
}
if (dma_has_cap(DMA_XOR, adev->common.cap_mask)) {
adev->common.max_xor = XOR_MAX_OPS;
adev->common.device_prep_dma_xor =
ppc440spe_adma_prep_dma_xor;
}
if (dma_has_cap(DMA_PQ, adev->common.cap_mask)) {
switch (adev->id) {
case PPC440SPE_DMA0_ID:
dma_set_maxpq(&adev->common,
DMA0_FIFO_SIZE / sizeof(struct dma_cdb), 0);
break;
case PPC440SPE_DMA1_ID:
dma_set_maxpq(&adev->common,
DMA1_FIFO_SIZE / sizeof(struct dma_cdb), 0);
break;
case PPC440SPE_XOR_ID:
adev->common.max_pq = XOR_MAX_OPS * 3;
break;
}
adev->common.device_prep_dma_pq =
ppc440spe_adma_prep_dma_pq;
}
if (dma_has_cap(DMA_PQ_VAL, adev->common.cap_mask)) {
switch (adev->id) {
case PPC440SPE_DMA0_ID:
adev->common.max_pq = DMA0_FIFO_SIZE /
sizeof(struct dma_cdb);
break;
case PPC440SPE_DMA1_ID:
adev->common.max_pq = DMA1_FIFO_SIZE /
sizeof(struct dma_cdb);
break;
}
adev->common.device_prep_dma_pq_val =
ppc440spe_adma_prep_dma_pqzero_sum;
}
if (dma_has_cap(DMA_XOR_VAL, adev->common.cap_mask)) {
switch (adev->id) {
case PPC440SPE_DMA0_ID:
adev->common.max_xor = DMA0_FIFO_SIZE /
sizeof(struct dma_cdb);
break;
case PPC440SPE_DMA1_ID:
adev->common.max_xor = DMA1_FIFO_SIZE /
sizeof(struct dma_cdb);
break;
}
adev->common.device_prep_dma_xor_val =
ppc440spe_adma_prep_dma_xor_zero_sum;
}
if (dma_has_cap(DMA_INTERRUPT, adev->common.cap_mask)) {
adev->common.device_prep_dma_interrupt =
ppc440spe_adma_prep_dma_interrupt;
}
pr_info("%s: AMCC(R) PPC440SP(E) ADMA Engine: "
"( %s%s%s%s%s%s)\n",
dev_name(adev->dev),
dma_has_cap(DMA_PQ, adev->common.cap_mask) ? "pq " : "",
dma_has_cap(DMA_PQ_VAL, adev->common.cap_mask) ? "pq_val " : "",
dma_has_cap(DMA_XOR, adev->common.cap_mask) ? "xor " : "",
dma_has_cap(DMA_XOR_VAL, adev->common.cap_mask) ? "xor_val " : "",
dma_has_cap(DMA_MEMCPY, adev->common.cap_mask) ? "memcpy " : "",
dma_has_cap(DMA_INTERRUPT, adev->common.cap_mask) ? "intr " : "");
}
static int ppc440spe_adma_setup_irqs(struct ppc440spe_adma_device *adev,
struct ppc440spe_adma_chan *chan,
int *initcode)
{
struct platform_device *ofdev;
struct device_node *np;
int ret;
ofdev = container_of(adev->dev, struct platform_device, dev);
np = ofdev->dev.of_node;
if (adev->id != PPC440SPE_XOR_ID) {
adev->err_irq = irq_of_parse_and_map(np, 1);
if (!adev->err_irq) {
dev_warn(adev->dev, "no err irq resource?\n");
*initcode = PPC_ADMA_INIT_IRQ2;
adev->err_irq = -ENXIO;
} else
atomic_inc(&ppc440spe_adma_err_irq_ref);
} else {
adev->err_irq = -ENXIO;
}
adev->irq = irq_of_parse_and_map(np, 0);
if (!adev->irq) {
dev_err(adev->dev, "no irq resource\n");
*initcode = PPC_ADMA_INIT_IRQ1;
ret = -ENXIO;
goto err_irq_map;
}
dev_dbg(adev->dev, "irq %d, err irq %d\n",
adev->irq, adev->err_irq);
ret = request_irq(adev->irq, ppc440spe_adma_eot_handler,
0, dev_driver_string(adev->dev), chan);
if (ret) {
dev_err(adev->dev, "can't request irq %d\n",
adev->irq);
*initcode = PPC_ADMA_INIT_IRQ1;
ret = -EIO;
goto err_req1;
}
/* only DMA engines have a separate error IRQ
* so it's Ok if err_irq < 0 in XOR engine case.
*/
if (adev->err_irq > 0) {
/* both DMA engines share common error IRQ */
ret = request_irq(adev->err_irq,
ppc440spe_adma_err_handler,
IRQF_SHARED,
dev_driver_string(adev->dev),
chan);
if (ret) {
dev_err(adev->dev, "can't request irq %d\n",
adev->err_irq);
*initcode = PPC_ADMA_INIT_IRQ2;
ret = -EIO;
goto err_req2;
}
}
if (adev->id == PPC440SPE_XOR_ID) {
/* enable XOR engine interrupts */
iowrite32be(XOR_IE_CBCIE_BIT | XOR_IE_ICBIE_BIT |
XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT,
&adev->xor_reg->ier);
} else {
u32 mask, enable;
np = of_find_compatible_node(NULL, NULL, "ibm,i2o-440spe");
if (!np) {
pr_err("%s: can't find I2O device tree node\n",
__func__);
ret = -ENODEV;
goto err_req2;
}
adev->i2o_reg = of_iomap(np, 0);
if (!adev->i2o_reg) {
pr_err("%s: failed to map I2O registers\n", __func__);
of_node_put(np);
ret = -EINVAL;
goto err_req2;
}
of_node_put(np);
/* Unmask 'CS FIFO Attention' interrupts and
* enable generating interrupts on errors
*/
enable = (adev->id == PPC440SPE_DMA0_ID) ?
~(I2O_IOPIM_P0SNE | I2O_IOPIM_P0EM) :
~(I2O_IOPIM_P1SNE | I2O_IOPIM_P1EM);
mask = ioread32(&adev->i2o_reg->iopim) & enable;
iowrite32(mask, &adev->i2o_reg->iopim);
}
return 0;
err_req2:
free_irq(adev->irq, chan);
err_req1:
irq_dispose_mapping(adev->irq);
err_irq_map:
if (adev->err_irq > 0) {
if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref))
irq_dispose_mapping(adev->err_irq);
}
return ret;
}
static void ppc440spe_adma_release_irqs(struct ppc440spe_adma_device *adev,
struct ppc440spe_adma_chan *chan)
{
u32 mask, disable;
if (adev->id == PPC440SPE_XOR_ID) {
/* disable XOR engine interrupts */
mask = ioread32be(&adev->xor_reg->ier);
mask &= ~(XOR_IE_CBCIE_BIT | XOR_IE_ICBIE_BIT |
XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT);
iowrite32be(mask, &adev->xor_reg->ier);
} else {
/* disable DMAx engine interrupts */
disable = (adev->id == PPC440SPE_DMA0_ID) ?
(I2O_IOPIM_P0SNE | I2O_IOPIM_P0EM) :
(I2O_IOPIM_P1SNE | I2O_IOPIM_P1EM);
mask = ioread32(&adev->i2o_reg->iopim) | disable;
iowrite32(mask, &adev->i2o_reg->iopim);
}
free_irq(adev->irq, chan);
irq_dispose_mapping(adev->irq);
if (adev->err_irq > 0) {
free_irq(adev->err_irq, chan);
if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref)) {
irq_dispose_mapping(adev->err_irq);
iounmap(adev->i2o_reg);
}
}
}
/**
* ppc440spe_adma_probe - probe the asynch device
*/
static int ppc440spe_adma_probe(struct platform_device *ofdev)
{
struct device_node *np = ofdev->dev.of_node;
struct resource res;
struct ppc440spe_adma_device *adev;
struct ppc440spe_adma_chan *chan;
struct ppc_dma_chan_ref *ref, *_ref;
int ret = 0, initcode = PPC_ADMA_INIT_OK;
const u32 *idx;
int len;
void *regs;
u32 id, pool_size;
if (of_device_is_compatible(np, "amcc,xor-accelerator")) {
id = PPC440SPE_XOR_ID;
/* As far as the XOR engine is concerned, it does not
* use FIFOs but uses linked list. So there is no dependency
* between pool size to allocate and the engine configuration.
*/
pool_size = PAGE_SIZE << 1;
} else {
/* it is DMA0 or DMA1 */
idx = of_get_property(np, "cell-index", &len);
if (!idx || (len != sizeof(u32))) {
dev_err(&ofdev->dev, "Device node %pOF has missing "
"or invalid cell-index property\n",
np);
return -EINVAL;
}
id = *idx;
/* DMA0,1 engines use FIFO to maintain CDBs, so we
* should allocate the pool accordingly to size of this
* FIFO. Thus, the pool size depends on the FIFO depth:
* how much CDBs pointers the FIFO may contain then so
* much CDBs we should provide in the pool.
* That is
* CDB size = 32B;
* CDBs number = (DMA0_FIFO_SIZE >> 3);
* Pool size = CDBs number * CDB size =
* = (DMA0_FIFO_SIZE >> 3) << 5 = DMA0_FIFO_SIZE << 2.
*/
pool_size = (id == PPC440SPE_DMA0_ID) ?
DMA0_FIFO_SIZE : DMA1_FIFO_SIZE;
pool_size <<= 2;
}
if (of_address_to_resource(np, 0, &res)) {
dev_err(&ofdev->dev, "failed to get memory resource\n");
initcode = PPC_ADMA_INIT_MEMRES;
ret = -ENODEV;
goto out;
}
if (!request_mem_region(res.start, resource_size(&res),
dev_driver_string(&ofdev->dev))) {
dev_err(&ofdev->dev, "failed to request memory region %pR\n",
&res);
initcode = PPC_ADMA_INIT_MEMREG;
ret = -EBUSY;
goto out;
}
/* create a device */
adev = kzalloc(sizeof(*adev), GFP_KERNEL);
if (!adev) {
initcode = PPC_ADMA_INIT_ALLOC;
ret = -ENOMEM;
goto err_adev_alloc;
}
adev->id = id;
adev->pool_size = pool_size;
/* allocate coherent memory for hardware descriptors */
adev->dma_desc_pool_virt = dma_alloc_coherent(&ofdev->dev,
adev->pool_size, &adev->dma_desc_pool,
GFP_KERNEL);
if (adev->dma_desc_pool_virt == NULL) {
dev_err(&ofdev->dev, "failed to allocate %d bytes of coherent "
"memory for hardware descriptors\n",
adev->pool_size);
initcode = PPC_ADMA_INIT_COHERENT;
ret = -ENOMEM;
goto err_dma_alloc;
}
dev_dbg(&ofdev->dev, "allocated descriptor pool virt 0x%p phys 0x%llx\n",
adev->dma_desc_pool_virt, (u64)adev->dma_desc_pool);
regs = ioremap(res.start, resource_size(&res));
if (!regs) {
dev_err(&ofdev->dev, "failed to ioremap regs!\n");
ret = -ENOMEM;
goto err_regs_alloc;
}
if (adev->id == PPC440SPE_XOR_ID) {
adev->xor_reg = regs;
/* Reset XOR */
iowrite32be(XOR_CRSR_XASR_BIT, &adev->xor_reg->crsr);
iowrite32be(XOR_CRSR_64BA_BIT, &adev->xor_reg->crrr);
} else {
size_t fifo_size = (adev->id == PPC440SPE_DMA0_ID) ?
DMA0_FIFO_SIZE : DMA1_FIFO_SIZE;
adev->dma_reg = regs;
/* DMAx_FIFO_SIZE is defined in bytes,
* <fsiz> - is defined in number of CDB pointers (8byte).
* DMA FIFO Length = CSlength + CPlength, where
* CSlength = CPlength = (fsiz + 1) * 8.
*/
iowrite32(DMA_FIFO_ENABLE | ((fifo_size >> 3) - 2),
&adev->dma_reg->fsiz);
/* Configure DMA engine */
iowrite32(DMA_CFG_DXEPR_HP | DMA_CFG_DFMPP_HP | DMA_CFG_FALGN,
&adev->dma_reg->cfg);
/* Clear Status */
iowrite32(~0, &adev->dma_reg->dsts);
}
adev->dev = &ofdev->dev;
adev->common.dev = &ofdev->dev;
INIT_LIST_HEAD(&adev->common.channels);
platform_set_drvdata(ofdev, adev);
/* create a channel */
chan = kzalloc(sizeof(*chan), GFP_KERNEL);
if (!chan) {
initcode = PPC_ADMA_INIT_CHANNEL;
ret = -ENOMEM;
goto err_chan_alloc;
}
spin_lock_init(&chan->lock);
INIT_LIST_HEAD(&chan->chain);
INIT_LIST_HEAD(&chan->all_slots);
chan->device = adev;
chan->common.device = &adev->common;
dma_cookie_init(&chan->common);
list_add_tail(&chan->common.device_node, &adev->common.channels);
tasklet_setup(&chan->irq_tasklet, ppc440spe_adma_tasklet);
/* allocate and map helper pages for async validation or
* async_mult/async_sum_product operations on DMA0/1.
*/
if (adev->id != PPC440SPE_XOR_ID) {
chan->pdest_page = alloc_page(GFP_KERNEL);
chan->qdest_page = alloc_page(GFP_KERNEL);
if (!chan->pdest_page ||
!chan->qdest_page) {
if (chan->pdest_page)
__free_page(chan->pdest_page);
if (chan->qdest_page)
__free_page(chan->qdest_page);
ret = -ENOMEM;
goto err_page_alloc;
}
chan->pdest = dma_map_page(&ofdev->dev, chan->pdest_page, 0,
PAGE_SIZE, DMA_BIDIRECTIONAL);
chan->qdest = dma_map_page(&ofdev->dev, chan->qdest_page, 0,
PAGE_SIZE, DMA_BIDIRECTIONAL);
}
ref = kmalloc(sizeof(*ref), GFP_KERNEL);
if (ref) {
ref->chan = &chan->common;
INIT_LIST_HEAD(&ref->node);
list_add_tail(&ref->node, &ppc440spe_adma_chan_list);
} else {
dev_err(&ofdev->dev, "failed to allocate channel reference!\n");
ret = -ENOMEM;
goto err_ref_alloc;
}
ret = ppc440spe_adma_setup_irqs(adev, chan, &initcode);
if (ret)
goto err_irq;
ppc440spe_adma_init_capabilities(adev);
ret = dma_async_device_register(&adev->common);
if (ret) {
initcode = PPC_ADMA_INIT_REGISTER;
dev_err(&ofdev->dev, "failed to register dma device\n");
goto err_dev_reg;
}
goto out;
err_dev_reg:
ppc440spe_adma_release_irqs(adev, chan);
err_irq:
list_for_each_entry_safe(ref, _ref, &ppc440spe_adma_chan_list, node) {
if (chan == to_ppc440spe_adma_chan(ref->chan)) {
list_del(&ref->node);
kfree(ref);
}
}
err_ref_alloc:
if (adev->id != PPC440SPE_XOR_ID) {
dma_unmap_page(&ofdev->dev, chan->pdest,
PAGE_SIZE, DMA_BIDIRECTIONAL);
dma_unmap_page(&ofdev->dev, chan->qdest,
PAGE_SIZE, DMA_BIDIRECTIONAL);
__free_page(chan->pdest_page);
__free_page(chan->qdest_page);
}
err_page_alloc:
kfree(chan);
err_chan_alloc:
if (adev->id == PPC440SPE_XOR_ID)
iounmap(adev->xor_reg);
else
iounmap(adev->dma_reg);
err_regs_alloc:
dma_free_coherent(adev->dev, adev->pool_size,
adev->dma_desc_pool_virt,
adev->dma_desc_pool);
err_dma_alloc:
kfree(adev);
err_adev_alloc:
release_mem_region(res.start, resource_size(&res));
out:
if (id < PPC440SPE_ADMA_ENGINES_NUM)
ppc440spe_adma_devices[id] = initcode;
return ret;
}
/**
* ppc440spe_adma_remove - remove the asynch device
*/
static int ppc440spe_adma_remove(struct platform_device *ofdev)
{
struct ppc440spe_adma_device *adev = platform_get_drvdata(ofdev);
struct device_node *np = ofdev->dev.of_node;
struct resource res;
struct dma_chan *chan, *_chan;
struct ppc_dma_chan_ref *ref, *_ref;
struct ppc440spe_adma_chan *ppc440spe_chan;
if (adev->id < PPC440SPE_ADMA_ENGINES_NUM)
ppc440spe_adma_devices[adev->id] = -1;
dma_async_device_unregister(&adev->common);
list_for_each_entry_safe(chan, _chan, &adev->common.channels,
device_node) {
ppc440spe_chan = to_ppc440spe_adma_chan(chan);
ppc440spe_adma_release_irqs(adev, ppc440spe_chan);
tasklet_kill(&ppc440spe_chan->irq_tasklet);
if (adev->id != PPC440SPE_XOR_ID) {
dma_unmap_page(&ofdev->dev, ppc440spe_chan->pdest,
PAGE_SIZE, DMA_BIDIRECTIONAL);
dma_unmap_page(&ofdev->dev, ppc440spe_chan->qdest,
PAGE_SIZE, DMA_BIDIRECTIONAL);
__free_page(ppc440spe_chan->pdest_page);
__free_page(ppc440spe_chan->qdest_page);
}
list_for_each_entry_safe(ref, _ref, &ppc440spe_adma_chan_list,
node) {
if (ppc440spe_chan ==
to_ppc440spe_adma_chan(ref->chan)) {
list_del(&ref->node);
kfree(ref);
}
}
list_del(&chan->device_node);
kfree(ppc440spe_chan);
}
dma_free_coherent(adev->dev, adev->pool_size,
adev->dma_desc_pool_virt, adev->dma_desc_pool);
if (adev->id == PPC440SPE_XOR_ID)
iounmap(adev->xor_reg);
else
iounmap(adev->dma_reg);
of_address_to_resource(np, 0, &res);
release_mem_region(res.start, resource_size(&res));
kfree(adev);
return 0;
}
/*
* /sys driver interface to enable h/w RAID-6 capabilities
* Files created in e.g. /sys/devices/plb.0/400100100.dma0/driver/
* directory are "devices", "enable" and "poly".
* "devices" shows available engines.
* "enable" is used to enable RAID-6 capabilities or to check
* whether these has been activated.
* "poly" allows setting/checking used polynomial (for PPC440SPe only).
*/
static ssize_t devices_show(struct device_driver *dev, char *buf)
{
ssize_t size = 0;
int i;
for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++) {
if (ppc440spe_adma_devices[i] == -1)
continue;
size += sysfs_emit_at(buf, size, "PPC440SP(E)-ADMA.%d: %s\n",
i, ppc_adma_errors[ppc440spe_adma_devices[i]]);
}
return size;
}
static DRIVER_ATTR_RO(devices);
static ssize_t enable_show(struct device_driver *dev, char *buf)
{
return sysfs_emit(buf, "PPC440SP(e) RAID-6 capabilities are %sABLED.\n",
ppc440spe_r6_enabled ? "EN" : "DIS");
}
static ssize_t enable_store(struct device_driver *dev, const char *buf,
size_t count)
{
unsigned long val;
int err;
if (!count || count > 11)
return -EINVAL;
if (!ppc440spe_r6_tchan)
return -EFAULT;
/* Write a key */
err = kstrtoul(buf, 16, &val);
if (err)
return err;
dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_XORBA, val);
isync();
/* Verify whether it really works now */
if (ppc440spe_test_raid6(ppc440spe_r6_tchan) == 0) {
pr_info("PPC440SP(e) RAID-6 has been activated "
"successfully\n");
ppc440spe_r6_enabled = 1;
} else {
pr_info("PPC440SP(e) RAID-6 hasn't been activated!"
" Error key ?\n");
ppc440spe_r6_enabled = 0;
}
return count;
}
static DRIVER_ATTR_RW(enable);
static ssize_t poly_show(struct device_driver *dev, char *buf)
{
ssize_t size = 0;
u32 reg;
#ifdef CONFIG_440SP
/* 440SP has fixed polynomial */
reg = 0x4d;
#else
reg = dcr_read(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL);
reg >>= MQ0_CFBHL_POLY;
reg &= 0xFF;
#endif
size = sysfs_emit(buf, "PPC440SP(e) RAID-6 driver "
"uses 0x1%02x polynomial.\n", reg);
return size;
}
static ssize_t poly_store(struct device_driver *dev, const char *buf,
size_t count)
{
unsigned long reg, val;
int err;
#ifdef CONFIG_440SP
/* 440SP uses default 0x14D polynomial only */
return -EINVAL;
#endif
if (!count || count > 6)
return -EINVAL;
/* e.g., 0x14D or 0x11D */
err = kstrtoul(buf, 16, &val);
if (err)
return err;
if (val & ~0x1FF)
return -EINVAL;
val &= 0xFF;
reg = dcr_read(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL);
reg &= ~(0xFF << MQ0_CFBHL_POLY);
reg |= val << MQ0_CFBHL_POLY;
dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL, reg);
return count;
}
static DRIVER_ATTR_RW(poly);
/*
* Common initialisation for RAID engines; allocate memory for
* DMAx FIFOs, perform configuration common for all DMA engines.
* Further DMA engine specific configuration is done at probe time.
*/
static int ppc440spe_configure_raid_devices(void)
{
struct device_node *np;
struct resource i2o_res;
struct i2o_regs __iomem *i2o_reg;
dcr_host_t i2o_dcr_host;
unsigned int dcr_base, dcr_len;
int i, ret;
np = of_find_compatible_node(NULL, NULL, "ibm,i2o-440spe");
if (!np) {
pr_err("%s: can't find I2O device tree node\n",
__func__);
return -ENODEV;
}
if (of_address_to_resource(np, 0, &i2o_res)) {
of_node_put(np);
return -EINVAL;
}
i2o_reg = of_iomap(np, 0);
if (!i2o_reg) {
pr_err("%s: failed to map I2O registers\n", __func__);
of_node_put(np);
return -EINVAL;
}
/* Get I2O DCRs base */
dcr_base = dcr_resource_start(np, 0);
dcr_len = dcr_resource_len(np, 0);
if (!dcr_base && !dcr_len) {
pr_err("%pOF: can't get DCR registers base/len!\n", np);
of_node_put(np);
iounmap(i2o_reg);
return -ENODEV;
}
i2o_dcr_host = dcr_map(np, dcr_base, dcr_len);
if (!DCR_MAP_OK(i2o_dcr_host)) {
pr_err("%pOF: failed to map DCRs!\n", np);
of_node_put(np);
iounmap(i2o_reg);
return -ENODEV;
}
of_node_put(np);
/* Provide memory regions for DMA's FIFOs: I2O, DMA0 and DMA1 share
* the base address of FIFO memory space.
* Actually we need twice more physical memory than programmed in the
* <fsiz> register (because there are two FIFOs for each DMA: CP and CS)
*/
ppc440spe_dma_fifo_buf = kmalloc((DMA0_FIFO_SIZE + DMA1_FIFO_SIZE) << 1,
GFP_KERNEL);
if (!ppc440spe_dma_fifo_buf) {
pr_err("%s: DMA FIFO buffer allocation failed.\n", __func__);
iounmap(i2o_reg);
dcr_unmap(i2o_dcr_host, dcr_len);
return -ENOMEM;
}
/*
* Configure h/w
*/
/* Reset I2O/DMA */
mtdcri(SDR0, DCRN_SDR0_SRST, DCRN_SDR0_SRST_I2ODMA);
mtdcri(SDR0, DCRN_SDR0_SRST, 0);
/* Setup the base address of mmaped registers */
dcr_write(i2o_dcr_host, DCRN_I2O0_IBAH, (u32)(i2o_res.start >> 32));
dcr_write(i2o_dcr_host, DCRN_I2O0_IBAL, (u32)(i2o_res.start) |
I2O_REG_ENABLE);
dcr_unmap(i2o_dcr_host, dcr_len);
/* Setup FIFO memory space base address */
iowrite32(0, &i2o_reg->ifbah);
iowrite32(((u32)__pa(ppc440spe_dma_fifo_buf)), &i2o_reg->ifbal);
/* set zero FIFO size for I2O, so the whole
* ppc440spe_dma_fifo_buf is used by DMAs.
* DMAx_FIFOs will be configured while probe.
*/
iowrite32(0, &i2o_reg->ifsiz);
iounmap(i2o_reg);
/* To prepare WXOR/RXOR functionality we need access to
* Memory Queue Module DCRs (finally it will be enabled
* via /sys interface of the ppc440spe ADMA driver).
*/
np = of_find_compatible_node(NULL, NULL, "ibm,mq-440spe");
if (!np) {
pr_err("%s: can't find MQ device tree node\n",
__func__);
ret = -ENODEV;
goto out_free;
}
/* Get MQ DCRs base */
dcr_base = dcr_resource_start(np, 0);
dcr_len = dcr_resource_len(np, 0);
if (!dcr_base && !dcr_len) {
pr_err("%pOF: can't get DCR registers base/len!\n", np);
ret = -ENODEV;
goto out_mq;
}
ppc440spe_mq_dcr_host = dcr_map(np, dcr_base, dcr_len);
if (!DCR_MAP_OK(ppc440spe_mq_dcr_host)) {
pr_err("%pOF: failed to map DCRs!\n", np);
ret = -ENODEV;
goto out_mq;
}
of_node_put(np);
ppc440spe_mq_dcr_len = dcr_len;
/* Set HB alias */
dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_BAUH, DMA_CUED_XOR_HB);
/* Set:
* - LL transaction passing limit to 1;
* - Memory controller cycle limit to 1;
* - Galois Polynomial to 0x14d (default)
*/
dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL,
(1 << MQ0_CFBHL_TPLM) | (1 << MQ0_CFBHL_HBCL) |
(PPC440SPE_DEFAULT_POLY << MQ0_CFBHL_POLY));
atomic_set(&ppc440spe_adma_err_irq_ref, 0);
for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++)
ppc440spe_adma_devices[i] = -1;
return 0;
out_mq:
of_node_put(np);
out_free:
kfree(ppc440spe_dma_fifo_buf);
return ret;
}
static const struct of_device_id ppc440spe_adma_of_match[] = {
{ .compatible = "ibm,dma-440spe", },
{ .compatible = "amcc,xor-accelerator", },
{},
};
MODULE_DEVICE_TABLE(of, ppc440spe_adma_of_match);
static struct platform_driver ppc440spe_adma_driver = {
.probe = ppc440spe_adma_probe,
.remove = ppc440spe_adma_remove,
.driver = {
.name = "PPC440SP(E)-ADMA",
.of_match_table = ppc440spe_adma_of_match,
},
};
static __init int ppc440spe_adma_init(void)
{
int ret;
ret = ppc440spe_configure_raid_devices();
if (ret)
return ret;
ret = platform_driver_register(&ppc440spe_adma_driver);
if (ret) {
pr_err("%s: failed to register platform driver\n",
__func__);
goto out_reg;
}
/* Initialization status */
ret = driver_create_file(&ppc440spe_adma_driver.driver,
&driver_attr_devices);
if (ret)
goto out_dev;
/* RAID-6 h/w enable entry */
ret = driver_create_file(&ppc440spe_adma_driver.driver,
&driver_attr_enable);
if (ret)
goto out_en;
/* GF polynomial to use */
ret = driver_create_file(&ppc440spe_adma_driver.driver,
&driver_attr_poly);
if (!ret)
return ret;
driver_remove_file(&ppc440spe_adma_driver.driver,
&driver_attr_enable);
out_en:
driver_remove_file(&ppc440spe_adma_driver.driver,
&driver_attr_devices);
out_dev:
/* User will not be able to enable h/w RAID-6 */
pr_err("%s: failed to create RAID-6 driver interface\n",
__func__);
platform_driver_unregister(&ppc440spe_adma_driver);
out_reg:
dcr_unmap(ppc440spe_mq_dcr_host, ppc440spe_mq_dcr_len);
kfree(ppc440spe_dma_fifo_buf);
return ret;
}
static void __exit ppc440spe_adma_exit(void)
{
driver_remove_file(&ppc440spe_adma_driver.driver,
&driver_attr_poly);
driver_remove_file(&ppc440spe_adma_driver.driver,
&driver_attr_enable);
driver_remove_file(&ppc440spe_adma_driver.driver,
&driver_attr_devices);
platform_driver_unregister(&ppc440spe_adma_driver);
dcr_unmap(ppc440spe_mq_dcr_host, ppc440spe_mq_dcr_len);
kfree(ppc440spe_dma_fifo_buf);
}
arch_initcall(ppc440spe_adma_init);
module_exit(ppc440spe_adma_exit);
MODULE_AUTHOR("Yuri Tikhonov <[email protected]>");
MODULE_DESCRIPTION("PPC440SPE ADMA Engine Driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/ppc4xx/adma.c |
// SPDX-License-Identifier: GPL-2.0
// (C) 2017-2018 Synopsys, Inc. (www.synopsys.com)
/*
* Synopsys DesignWare AXI DMA Controller driver.
*
* Author: Eugeniy Paltsev <[email protected]>
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "dw-axi-dmac.h"
#include "../dmaengine.h"
#include "../virt-dma.h"
/*
* The set of bus widths supported by the DMA controller. DW AXI DMAC supports
* master data bus width up to 512 bits (for both AXI master interfaces), but
* it depends on IP block configuration.
*/
#define AXI_DMA_BUSWIDTHS \
(DMA_SLAVE_BUSWIDTH_1_BYTE | \
DMA_SLAVE_BUSWIDTH_2_BYTES | \
DMA_SLAVE_BUSWIDTH_4_BYTES | \
DMA_SLAVE_BUSWIDTH_8_BYTES | \
DMA_SLAVE_BUSWIDTH_16_BYTES | \
DMA_SLAVE_BUSWIDTH_32_BYTES | \
DMA_SLAVE_BUSWIDTH_64_BYTES)
#define AXI_DMA_FLAG_HAS_APB_REGS BIT(0)
#define AXI_DMA_FLAG_HAS_RESETS BIT(1)
#define AXI_DMA_FLAG_USE_CFG2 BIT(2)
static inline void
axi_dma_iowrite32(struct axi_dma_chip *chip, u32 reg, u32 val)
{
iowrite32(val, chip->regs + reg);
}
static inline u32 axi_dma_ioread32(struct axi_dma_chip *chip, u32 reg)
{
return ioread32(chip->regs + reg);
}
static inline void
axi_chan_iowrite32(struct axi_dma_chan *chan, u32 reg, u32 val)
{
iowrite32(val, chan->chan_regs + reg);
}
static inline u32 axi_chan_ioread32(struct axi_dma_chan *chan, u32 reg)
{
return ioread32(chan->chan_regs + reg);
}
static inline void
axi_chan_iowrite64(struct axi_dma_chan *chan, u32 reg, u64 val)
{
/*
* We split one 64 bit write for two 32 bit write as some HW doesn't
* support 64 bit access.
*/
iowrite32(lower_32_bits(val), chan->chan_regs + reg);
iowrite32(upper_32_bits(val), chan->chan_regs + reg + 4);
}
static inline void axi_chan_config_write(struct axi_dma_chan *chan,
struct axi_dma_chan_config *config)
{
u32 cfg_lo, cfg_hi;
cfg_lo = (config->dst_multblk_type << CH_CFG_L_DST_MULTBLK_TYPE_POS |
config->src_multblk_type << CH_CFG_L_SRC_MULTBLK_TYPE_POS);
if (chan->chip->dw->hdata->reg_map_8_channels &&
!chan->chip->dw->hdata->use_cfg2) {
cfg_hi = config->tt_fc << CH_CFG_H_TT_FC_POS |
config->hs_sel_src << CH_CFG_H_HS_SEL_SRC_POS |
config->hs_sel_dst << CH_CFG_H_HS_SEL_DST_POS |
config->src_per << CH_CFG_H_SRC_PER_POS |
config->dst_per << CH_CFG_H_DST_PER_POS |
config->prior << CH_CFG_H_PRIORITY_POS;
} else {
cfg_lo |= config->src_per << CH_CFG2_L_SRC_PER_POS |
config->dst_per << CH_CFG2_L_DST_PER_POS;
cfg_hi = config->tt_fc << CH_CFG2_H_TT_FC_POS |
config->hs_sel_src << CH_CFG2_H_HS_SEL_SRC_POS |
config->hs_sel_dst << CH_CFG2_H_HS_SEL_DST_POS |
config->prior << CH_CFG2_H_PRIORITY_POS;
}
axi_chan_iowrite32(chan, CH_CFG_L, cfg_lo);
axi_chan_iowrite32(chan, CH_CFG_H, cfg_hi);
}
static inline void axi_dma_disable(struct axi_dma_chip *chip)
{
u32 val;
val = axi_dma_ioread32(chip, DMAC_CFG);
val &= ~DMAC_EN_MASK;
axi_dma_iowrite32(chip, DMAC_CFG, val);
}
static inline void axi_dma_enable(struct axi_dma_chip *chip)
{
u32 val;
val = axi_dma_ioread32(chip, DMAC_CFG);
val |= DMAC_EN_MASK;
axi_dma_iowrite32(chip, DMAC_CFG, val);
}
static inline void axi_dma_irq_disable(struct axi_dma_chip *chip)
{
u32 val;
val = axi_dma_ioread32(chip, DMAC_CFG);
val &= ~INT_EN_MASK;
axi_dma_iowrite32(chip, DMAC_CFG, val);
}
static inline void axi_dma_irq_enable(struct axi_dma_chip *chip)
{
u32 val;
val = axi_dma_ioread32(chip, DMAC_CFG);
val |= INT_EN_MASK;
axi_dma_iowrite32(chip, DMAC_CFG, val);
}
static inline void axi_chan_irq_disable(struct axi_dma_chan *chan, u32 irq_mask)
{
u32 val;
if (likely(irq_mask == DWAXIDMAC_IRQ_ALL)) {
axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, DWAXIDMAC_IRQ_NONE);
} else {
val = axi_chan_ioread32(chan, CH_INTSTATUS_ENA);
val &= ~irq_mask;
axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, val);
}
}
static inline void axi_chan_irq_set(struct axi_dma_chan *chan, u32 irq_mask)
{
axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, irq_mask);
}
static inline void axi_chan_irq_sig_set(struct axi_dma_chan *chan, u32 irq_mask)
{
axi_chan_iowrite32(chan, CH_INTSIGNAL_ENA, irq_mask);
}
static inline void axi_chan_irq_clear(struct axi_dma_chan *chan, u32 irq_mask)
{
axi_chan_iowrite32(chan, CH_INTCLEAR, irq_mask);
}
static inline u32 axi_chan_irq_read(struct axi_dma_chan *chan)
{
return axi_chan_ioread32(chan, CH_INTSTATUS);
}
static inline void axi_chan_disable(struct axi_dma_chan *chan)
{
u32 val;
val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
val &= ~(BIT(chan->id) << DMAC_CHAN_EN_SHIFT);
if (chan->chip->dw->hdata->reg_map_8_channels)
val |= BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
else
val |= BIT(chan->id) << DMAC_CHAN_EN2_WE_SHIFT;
axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
}
static inline void axi_chan_enable(struct axi_dma_chan *chan)
{
u32 val;
val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
if (chan->chip->dw->hdata->reg_map_8_channels)
val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
else
val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
BIT(chan->id) << DMAC_CHAN_EN2_WE_SHIFT;
axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
}
static inline bool axi_chan_is_hw_enable(struct axi_dma_chan *chan)
{
u32 val;
val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
return !!(val & (BIT(chan->id) << DMAC_CHAN_EN_SHIFT));
}
static void axi_dma_hw_init(struct axi_dma_chip *chip)
{
int ret;
u32 i;
for (i = 0; i < chip->dw->hdata->nr_channels; i++) {
axi_chan_irq_disable(&chip->dw->chan[i], DWAXIDMAC_IRQ_ALL);
axi_chan_disable(&chip->dw->chan[i]);
}
ret = dma_set_mask_and_coherent(chip->dev, DMA_BIT_MASK(64));
if (ret)
dev_warn(chip->dev, "Unable to set coherent mask\n");
}
static u32 axi_chan_get_xfer_width(struct axi_dma_chan *chan, dma_addr_t src,
dma_addr_t dst, size_t len)
{
u32 max_width = chan->chip->dw->hdata->m_data_width;
return __ffs(src | dst | len | BIT(max_width));
}
static inline const char *axi_chan_name(struct axi_dma_chan *chan)
{
return dma_chan_name(&chan->vc.chan);
}
static struct axi_dma_desc *axi_desc_alloc(u32 num)
{
struct axi_dma_desc *desc;
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
desc->hw_desc = kcalloc(num, sizeof(*desc->hw_desc), GFP_NOWAIT);
if (!desc->hw_desc) {
kfree(desc);
return NULL;
}
return desc;
}
static struct axi_dma_lli *axi_desc_get(struct axi_dma_chan *chan,
dma_addr_t *addr)
{
struct axi_dma_lli *lli;
dma_addr_t phys;
lli = dma_pool_zalloc(chan->desc_pool, GFP_NOWAIT, &phys);
if (unlikely(!lli)) {
dev_err(chan2dev(chan), "%s: not enough descriptors available\n",
axi_chan_name(chan));
return NULL;
}
atomic_inc(&chan->descs_allocated);
*addr = phys;
return lli;
}
static void axi_desc_put(struct axi_dma_desc *desc)
{
struct axi_dma_chan *chan = desc->chan;
int count = atomic_read(&chan->descs_allocated);
struct axi_dma_hw_desc *hw_desc;
int descs_put;
for (descs_put = 0; descs_put < count; descs_put++) {
hw_desc = &desc->hw_desc[descs_put];
dma_pool_free(chan->desc_pool, hw_desc->lli, hw_desc->llp);
}
kfree(desc->hw_desc);
kfree(desc);
atomic_sub(descs_put, &chan->descs_allocated);
dev_vdbg(chan2dev(chan), "%s: %d descs put, %d still allocated\n",
axi_chan_name(chan), descs_put,
atomic_read(&chan->descs_allocated));
}
static void vchan_desc_put(struct virt_dma_desc *vdesc)
{
axi_desc_put(vd_to_axi_desc(vdesc));
}
static enum dma_status
dma_chan_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
struct virt_dma_desc *vdesc;
enum dma_status status;
u32 completed_length;
unsigned long flags;
u32 completed_blocks;
size_t bytes = 0;
u32 length;
u32 len;
status = dma_cookie_status(dchan, cookie, txstate);
if (status == DMA_COMPLETE || !txstate)
return status;
spin_lock_irqsave(&chan->vc.lock, flags);
vdesc = vchan_find_desc(&chan->vc, cookie);
if (vdesc) {
length = vd_to_axi_desc(vdesc)->length;
completed_blocks = vd_to_axi_desc(vdesc)->completed_blocks;
len = vd_to_axi_desc(vdesc)->hw_desc[0].len;
completed_length = completed_blocks * len;
bytes = length - completed_length;
}
spin_unlock_irqrestore(&chan->vc.lock, flags);
dma_set_residue(txstate, bytes);
return status;
}
static void write_desc_llp(struct axi_dma_hw_desc *desc, dma_addr_t adr)
{
desc->lli->llp = cpu_to_le64(adr);
}
static void write_chan_llp(struct axi_dma_chan *chan, dma_addr_t adr)
{
axi_chan_iowrite64(chan, CH_LLP, adr);
}
static void dw_axi_dma_set_byte_halfword(struct axi_dma_chan *chan, bool set)
{
u32 offset = DMAC_APB_BYTE_WR_CH_EN;
u32 reg_width, val;
if (!chan->chip->apb_regs) {
dev_dbg(chan->chip->dev, "apb_regs not initialized\n");
return;
}
reg_width = __ffs(chan->config.dst_addr_width);
if (reg_width == DWAXIDMAC_TRANS_WIDTH_16)
offset = DMAC_APB_HALFWORD_WR_CH_EN;
val = ioread32(chan->chip->apb_regs + offset);
if (set)
val |= BIT(chan->id);
else
val &= ~BIT(chan->id);
iowrite32(val, chan->chip->apb_regs + offset);
}
/* Called in chan locked context */
static void axi_chan_block_xfer_start(struct axi_dma_chan *chan,
struct axi_dma_desc *first)
{
u32 priority = chan->chip->dw->hdata->priority[chan->id];
struct axi_dma_chan_config config = {};
u32 irq_mask;
u8 lms = 0; /* Select AXI0 master for LLI fetching */
if (unlikely(axi_chan_is_hw_enable(chan))) {
dev_err(chan2dev(chan), "%s is non-idle!\n",
axi_chan_name(chan));
return;
}
axi_dma_enable(chan->chip);
config.dst_multblk_type = DWAXIDMAC_MBLK_TYPE_LL;
config.src_multblk_type = DWAXIDMAC_MBLK_TYPE_LL;
config.tt_fc = DWAXIDMAC_TT_FC_MEM_TO_MEM_DMAC;
config.prior = priority;
config.hs_sel_dst = DWAXIDMAC_HS_SEL_HW;
config.hs_sel_src = DWAXIDMAC_HS_SEL_HW;
switch (chan->direction) {
case DMA_MEM_TO_DEV:
dw_axi_dma_set_byte_halfword(chan, true);
config.tt_fc = chan->config.device_fc ?
DWAXIDMAC_TT_FC_MEM_TO_PER_DST :
DWAXIDMAC_TT_FC_MEM_TO_PER_DMAC;
if (chan->chip->apb_regs)
config.dst_per = chan->id;
else
config.dst_per = chan->hw_handshake_num;
break;
case DMA_DEV_TO_MEM:
config.tt_fc = chan->config.device_fc ?
DWAXIDMAC_TT_FC_PER_TO_MEM_SRC :
DWAXIDMAC_TT_FC_PER_TO_MEM_DMAC;
if (chan->chip->apb_regs)
config.src_per = chan->id;
else
config.src_per = chan->hw_handshake_num;
break;
default:
break;
}
axi_chan_config_write(chan, &config);
write_chan_llp(chan, first->hw_desc[0].llp | lms);
irq_mask = DWAXIDMAC_IRQ_DMA_TRF | DWAXIDMAC_IRQ_ALL_ERR;
axi_chan_irq_sig_set(chan, irq_mask);
/* Generate 'suspend' status but don't generate interrupt */
irq_mask |= DWAXIDMAC_IRQ_SUSPENDED;
axi_chan_irq_set(chan, irq_mask);
axi_chan_enable(chan);
}
static void axi_chan_start_first_queued(struct axi_dma_chan *chan)
{
struct axi_dma_desc *desc;
struct virt_dma_desc *vd;
vd = vchan_next_desc(&chan->vc);
if (!vd)
return;
desc = vd_to_axi_desc(vd);
dev_vdbg(chan2dev(chan), "%s: started %u\n", axi_chan_name(chan),
vd->tx.cookie);
axi_chan_block_xfer_start(chan, desc);
}
static void dma_chan_issue_pending(struct dma_chan *dchan)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
unsigned long flags;
spin_lock_irqsave(&chan->vc.lock, flags);
if (vchan_issue_pending(&chan->vc))
axi_chan_start_first_queued(chan);
spin_unlock_irqrestore(&chan->vc.lock, flags);
}
static void dw_axi_dma_synchronize(struct dma_chan *dchan)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
vchan_synchronize(&chan->vc);
}
static int dma_chan_alloc_chan_resources(struct dma_chan *dchan)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
/* ASSERT: channel is idle */
if (axi_chan_is_hw_enable(chan)) {
dev_err(chan2dev(chan), "%s is non-idle!\n",
axi_chan_name(chan));
return -EBUSY;
}
/* LLI address must be aligned to a 64-byte boundary */
chan->desc_pool = dma_pool_create(dev_name(chan2dev(chan)),
chan->chip->dev,
sizeof(struct axi_dma_lli),
64, 0);
if (!chan->desc_pool) {
dev_err(chan2dev(chan), "No memory for descriptors\n");
return -ENOMEM;
}
dev_vdbg(dchan2dev(dchan), "%s: allocating\n", axi_chan_name(chan));
pm_runtime_get(chan->chip->dev);
return 0;
}
static void dma_chan_free_chan_resources(struct dma_chan *dchan)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
/* ASSERT: channel is idle */
if (axi_chan_is_hw_enable(chan))
dev_err(dchan2dev(dchan), "%s is non-idle!\n",
axi_chan_name(chan));
axi_chan_disable(chan);
axi_chan_irq_disable(chan, DWAXIDMAC_IRQ_ALL);
vchan_free_chan_resources(&chan->vc);
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
dev_vdbg(dchan2dev(dchan),
"%s: free resources, descriptor still allocated: %u\n",
axi_chan_name(chan), atomic_read(&chan->descs_allocated));
pm_runtime_put(chan->chip->dev);
}
static void dw_axi_dma_set_hw_channel(struct axi_dma_chan *chan, bool set)
{
struct axi_dma_chip *chip = chan->chip;
unsigned long reg_value, val;
if (!chip->apb_regs) {
dev_err(chip->dev, "apb_regs not initialized\n");
return;
}
/*
* An unused DMA channel has a default value of 0x3F.
* Lock the DMA channel by assign a handshake number to the channel.
* Unlock the DMA channel by assign 0x3F to the channel.
*/
if (set)
val = chan->hw_handshake_num;
else
val = UNUSED_CHANNEL;
reg_value = lo_hi_readq(chip->apb_regs + DMAC_APB_HW_HS_SEL_0);
/* Channel is already allocated, set handshake as per channel ID */
/* 64 bit write should handle for 8 channels */
reg_value &= ~(DMA_APB_HS_SEL_MASK <<
(chan->id * DMA_APB_HS_SEL_BIT_SIZE));
reg_value |= (val << (chan->id * DMA_APB_HS_SEL_BIT_SIZE));
lo_hi_writeq(reg_value, chip->apb_regs + DMAC_APB_HW_HS_SEL_0);
return;
}
/*
* If DW_axi_dmac sees CHx_CTL.ShadowReg_Or_LLI_Last bit of the fetched LLI
* as 1, it understands that the current block is the final block in the
* transfer and completes the DMA transfer operation at the end of current
* block transfer.
*/
static void set_desc_last(struct axi_dma_hw_desc *desc)
{
u32 val;
val = le32_to_cpu(desc->lli->ctl_hi);
val |= CH_CTL_H_LLI_LAST;
desc->lli->ctl_hi = cpu_to_le32(val);
}
static void write_desc_sar(struct axi_dma_hw_desc *desc, dma_addr_t adr)
{
desc->lli->sar = cpu_to_le64(adr);
}
static void write_desc_dar(struct axi_dma_hw_desc *desc, dma_addr_t adr)
{
desc->lli->dar = cpu_to_le64(adr);
}
static void set_desc_src_master(struct axi_dma_hw_desc *desc)
{
u32 val;
/* Select AXI0 for source master */
val = le32_to_cpu(desc->lli->ctl_lo);
val &= ~CH_CTL_L_SRC_MAST;
desc->lli->ctl_lo = cpu_to_le32(val);
}
static void set_desc_dest_master(struct axi_dma_hw_desc *hw_desc,
struct axi_dma_desc *desc)
{
u32 val;
/* Select AXI1 for source master if available */
val = le32_to_cpu(hw_desc->lli->ctl_lo);
if (desc->chan->chip->dw->hdata->nr_masters > 1)
val |= CH_CTL_L_DST_MAST;
else
val &= ~CH_CTL_L_DST_MAST;
hw_desc->lli->ctl_lo = cpu_to_le32(val);
}
static int dw_axi_dma_set_hw_desc(struct axi_dma_chan *chan,
struct axi_dma_hw_desc *hw_desc,
dma_addr_t mem_addr, size_t len)
{
unsigned int data_width = BIT(chan->chip->dw->hdata->m_data_width);
unsigned int reg_width;
unsigned int mem_width;
dma_addr_t device_addr;
size_t axi_block_ts;
size_t block_ts;
u32 ctllo, ctlhi;
u32 burst_len;
axi_block_ts = chan->chip->dw->hdata->block_size[chan->id];
mem_width = __ffs(data_width | mem_addr | len);
if (mem_width > DWAXIDMAC_TRANS_WIDTH_32)
mem_width = DWAXIDMAC_TRANS_WIDTH_32;
if (!IS_ALIGNED(mem_addr, 4)) {
dev_err(chan->chip->dev, "invalid buffer alignment\n");
return -EINVAL;
}
switch (chan->direction) {
case DMA_MEM_TO_DEV:
reg_width = __ffs(chan->config.dst_addr_width);
device_addr = chan->config.dst_addr;
ctllo = reg_width << CH_CTL_L_DST_WIDTH_POS |
mem_width << CH_CTL_L_SRC_WIDTH_POS |
DWAXIDMAC_CH_CTL_L_NOINC << CH_CTL_L_DST_INC_POS |
DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_SRC_INC_POS;
block_ts = len >> mem_width;
break;
case DMA_DEV_TO_MEM:
reg_width = __ffs(chan->config.src_addr_width);
device_addr = chan->config.src_addr;
ctllo = reg_width << CH_CTL_L_SRC_WIDTH_POS |
mem_width << CH_CTL_L_DST_WIDTH_POS |
DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_DST_INC_POS |
DWAXIDMAC_CH_CTL_L_NOINC << CH_CTL_L_SRC_INC_POS;
block_ts = len >> reg_width;
break;
default:
return -EINVAL;
}
if (block_ts > axi_block_ts)
return -EINVAL;
hw_desc->lli = axi_desc_get(chan, &hw_desc->llp);
if (unlikely(!hw_desc->lli))
return -ENOMEM;
ctlhi = CH_CTL_H_LLI_VALID;
if (chan->chip->dw->hdata->restrict_axi_burst_len) {
burst_len = chan->chip->dw->hdata->axi_rw_burst_len;
ctlhi |= CH_CTL_H_ARLEN_EN | CH_CTL_H_AWLEN_EN |
burst_len << CH_CTL_H_ARLEN_POS |
burst_len << CH_CTL_H_AWLEN_POS;
}
hw_desc->lli->ctl_hi = cpu_to_le32(ctlhi);
if (chan->direction == DMA_MEM_TO_DEV) {
write_desc_sar(hw_desc, mem_addr);
write_desc_dar(hw_desc, device_addr);
} else {
write_desc_sar(hw_desc, device_addr);
write_desc_dar(hw_desc, mem_addr);
}
hw_desc->lli->block_ts_lo = cpu_to_le32(block_ts - 1);
ctllo |= DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_DST_MSIZE_POS |
DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_SRC_MSIZE_POS;
hw_desc->lli->ctl_lo = cpu_to_le32(ctllo);
set_desc_src_master(hw_desc);
hw_desc->len = len;
return 0;
}
static size_t calculate_block_len(struct axi_dma_chan *chan,
dma_addr_t dma_addr, size_t buf_len,
enum dma_transfer_direction direction)
{
u32 data_width, reg_width, mem_width;
size_t axi_block_ts, block_len;
axi_block_ts = chan->chip->dw->hdata->block_size[chan->id];
switch (direction) {
case DMA_MEM_TO_DEV:
data_width = BIT(chan->chip->dw->hdata->m_data_width);
mem_width = __ffs(data_width | dma_addr | buf_len);
if (mem_width > DWAXIDMAC_TRANS_WIDTH_32)
mem_width = DWAXIDMAC_TRANS_WIDTH_32;
block_len = axi_block_ts << mem_width;
break;
case DMA_DEV_TO_MEM:
reg_width = __ffs(chan->config.src_addr_width);
block_len = axi_block_ts << reg_width;
break;
default:
block_len = 0;
}
return block_len;
}
static struct dma_async_tx_descriptor *
dw_axi_dma_chan_prep_cyclic(struct dma_chan *dchan, dma_addr_t dma_addr,
size_t buf_len, size_t period_len,
enum dma_transfer_direction direction,
unsigned long flags)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
struct axi_dma_hw_desc *hw_desc = NULL;
struct axi_dma_desc *desc = NULL;
dma_addr_t src_addr = dma_addr;
u32 num_periods, num_segments;
size_t axi_block_len;
u32 total_segments;
u32 segment_len;
unsigned int i;
int status;
u64 llp = 0;
u8 lms = 0; /* Select AXI0 master for LLI fetching */
num_periods = buf_len / period_len;
axi_block_len = calculate_block_len(chan, dma_addr, buf_len, direction);
if (axi_block_len == 0)
return NULL;
num_segments = DIV_ROUND_UP(period_len, axi_block_len);
segment_len = DIV_ROUND_UP(period_len, num_segments);
total_segments = num_periods * num_segments;
desc = axi_desc_alloc(total_segments);
if (unlikely(!desc))
goto err_desc_get;
chan->direction = direction;
desc->chan = chan;
chan->cyclic = true;
desc->length = 0;
desc->period_len = period_len;
for (i = 0; i < total_segments; i++) {
hw_desc = &desc->hw_desc[i];
status = dw_axi_dma_set_hw_desc(chan, hw_desc, src_addr,
segment_len);
if (status < 0)
goto err_desc_get;
desc->length += hw_desc->len;
/* Set end-of-link to the linked descriptor, so that cyclic
* callback function can be triggered during interrupt.
*/
set_desc_last(hw_desc);
src_addr += segment_len;
}
llp = desc->hw_desc[0].llp;
/* Managed transfer list */
do {
hw_desc = &desc->hw_desc[--total_segments];
write_desc_llp(hw_desc, llp | lms);
llp = hw_desc->llp;
} while (total_segments);
dw_axi_dma_set_hw_channel(chan, true);
return vchan_tx_prep(&chan->vc, &desc->vd, flags);
err_desc_get:
if (desc)
axi_desc_put(desc);
return NULL;
}
static struct dma_async_tx_descriptor *
dw_axi_dma_chan_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
struct axi_dma_hw_desc *hw_desc = NULL;
struct axi_dma_desc *desc = NULL;
u32 num_segments, segment_len;
unsigned int loop = 0;
struct scatterlist *sg;
size_t axi_block_len;
u32 len, num_sgs = 0;
unsigned int i;
dma_addr_t mem;
int status;
u64 llp = 0;
u8 lms = 0; /* Select AXI0 master for LLI fetching */
if (unlikely(!is_slave_direction(direction) || !sg_len))
return NULL;
mem = sg_dma_address(sgl);
len = sg_dma_len(sgl);
axi_block_len = calculate_block_len(chan, mem, len, direction);
if (axi_block_len == 0)
return NULL;
for_each_sg(sgl, sg, sg_len, i)
num_sgs += DIV_ROUND_UP(sg_dma_len(sg), axi_block_len);
desc = axi_desc_alloc(num_sgs);
if (unlikely(!desc))
goto err_desc_get;
desc->chan = chan;
desc->length = 0;
chan->direction = direction;
for_each_sg(sgl, sg, sg_len, i) {
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
num_segments = DIV_ROUND_UP(sg_dma_len(sg), axi_block_len);
segment_len = DIV_ROUND_UP(sg_dma_len(sg), num_segments);
do {
hw_desc = &desc->hw_desc[loop++];
status = dw_axi_dma_set_hw_desc(chan, hw_desc, mem, segment_len);
if (status < 0)
goto err_desc_get;
desc->length += hw_desc->len;
len -= segment_len;
mem += segment_len;
} while (len >= segment_len);
}
/* Set end-of-link to the last link descriptor of list */
set_desc_last(&desc->hw_desc[num_sgs - 1]);
/* Managed transfer list */
do {
hw_desc = &desc->hw_desc[--num_sgs];
write_desc_llp(hw_desc, llp | lms);
llp = hw_desc->llp;
} while (num_sgs);
dw_axi_dma_set_hw_channel(chan, true);
return vchan_tx_prep(&chan->vc, &desc->vd, flags);
err_desc_get:
if (desc)
axi_desc_put(desc);
return NULL;
}
static struct dma_async_tx_descriptor *
dma_chan_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst_adr,
dma_addr_t src_adr, size_t len, unsigned long flags)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
size_t block_ts, max_block_ts, xfer_len;
struct axi_dma_hw_desc *hw_desc = NULL;
struct axi_dma_desc *desc = NULL;
u32 xfer_width, reg, num;
u64 llp = 0;
u8 lms = 0; /* Select AXI0 master for LLI fetching */
dev_dbg(chan2dev(chan), "%s: memcpy: src: %pad dst: %pad length: %zd flags: %#lx",
axi_chan_name(chan), &src_adr, &dst_adr, len, flags);
max_block_ts = chan->chip->dw->hdata->block_size[chan->id];
xfer_width = axi_chan_get_xfer_width(chan, src_adr, dst_adr, len);
num = DIV_ROUND_UP(len, max_block_ts << xfer_width);
desc = axi_desc_alloc(num);
if (unlikely(!desc))
goto err_desc_get;
desc->chan = chan;
num = 0;
desc->length = 0;
while (len) {
xfer_len = len;
hw_desc = &desc->hw_desc[num];
/*
* Take care for the alignment.
* Actually source and destination widths can be different, but
* make them same to be simpler.
*/
xfer_width = axi_chan_get_xfer_width(chan, src_adr, dst_adr, xfer_len);
/*
* block_ts indicates the total number of data of width
* to be transferred in a DMA block transfer.
* BLOCK_TS register should be set to block_ts - 1
*/
block_ts = xfer_len >> xfer_width;
if (block_ts > max_block_ts) {
block_ts = max_block_ts;
xfer_len = max_block_ts << xfer_width;
}
hw_desc->lli = axi_desc_get(chan, &hw_desc->llp);
if (unlikely(!hw_desc->lli))
goto err_desc_get;
write_desc_sar(hw_desc, src_adr);
write_desc_dar(hw_desc, dst_adr);
hw_desc->lli->block_ts_lo = cpu_to_le32(block_ts - 1);
reg = CH_CTL_H_LLI_VALID;
if (chan->chip->dw->hdata->restrict_axi_burst_len) {
u32 burst_len = chan->chip->dw->hdata->axi_rw_burst_len;
reg |= (CH_CTL_H_ARLEN_EN |
burst_len << CH_CTL_H_ARLEN_POS |
CH_CTL_H_AWLEN_EN |
burst_len << CH_CTL_H_AWLEN_POS);
}
hw_desc->lli->ctl_hi = cpu_to_le32(reg);
reg = (DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_DST_MSIZE_POS |
DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_SRC_MSIZE_POS |
xfer_width << CH_CTL_L_DST_WIDTH_POS |
xfer_width << CH_CTL_L_SRC_WIDTH_POS |
DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_DST_INC_POS |
DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_SRC_INC_POS);
hw_desc->lli->ctl_lo = cpu_to_le32(reg);
set_desc_src_master(hw_desc);
set_desc_dest_master(hw_desc, desc);
hw_desc->len = xfer_len;
desc->length += hw_desc->len;
/* update the length and addresses for the next loop cycle */
len -= xfer_len;
dst_adr += xfer_len;
src_adr += xfer_len;
num++;
}
/* Set end-of-link to the last link descriptor of list */
set_desc_last(&desc->hw_desc[num - 1]);
/* Managed transfer list */
do {
hw_desc = &desc->hw_desc[--num];
write_desc_llp(hw_desc, llp | lms);
llp = hw_desc->llp;
} while (num);
return vchan_tx_prep(&chan->vc, &desc->vd, flags);
err_desc_get:
if (desc)
axi_desc_put(desc);
return NULL;
}
static int dw_axi_dma_chan_slave_config(struct dma_chan *dchan,
struct dma_slave_config *config)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
memcpy(&chan->config, config, sizeof(*config));
return 0;
}
static void axi_chan_dump_lli(struct axi_dma_chan *chan,
struct axi_dma_hw_desc *desc)
{
if (!desc->lli) {
dev_err(dchan2dev(&chan->vc.chan), "NULL LLI\n");
return;
}
dev_err(dchan2dev(&chan->vc.chan),
"SAR: 0x%llx DAR: 0x%llx LLP: 0x%llx BTS 0x%x CTL: 0x%x:%08x",
le64_to_cpu(desc->lli->sar),
le64_to_cpu(desc->lli->dar),
le64_to_cpu(desc->lli->llp),
le32_to_cpu(desc->lli->block_ts_lo),
le32_to_cpu(desc->lli->ctl_hi),
le32_to_cpu(desc->lli->ctl_lo));
}
static void axi_chan_list_dump_lli(struct axi_dma_chan *chan,
struct axi_dma_desc *desc_head)
{
int count = atomic_read(&chan->descs_allocated);
int i;
for (i = 0; i < count; i++)
axi_chan_dump_lli(chan, &desc_head->hw_desc[i]);
}
static noinline void axi_chan_handle_err(struct axi_dma_chan *chan, u32 status)
{
struct virt_dma_desc *vd;
unsigned long flags;
spin_lock_irqsave(&chan->vc.lock, flags);
axi_chan_disable(chan);
/* The bad descriptor currently is in the head of vc list */
vd = vchan_next_desc(&chan->vc);
if (!vd) {
dev_err(chan2dev(chan), "BUG: %s, IRQ with no descriptors\n",
axi_chan_name(chan));
goto out;
}
/* Remove the completed descriptor from issued list */
list_del(&vd->node);
/* WARN about bad descriptor */
dev_err(chan2dev(chan),
"Bad descriptor submitted for %s, cookie: %d, irq: 0x%08x\n",
axi_chan_name(chan), vd->tx.cookie, status);
axi_chan_list_dump_lli(chan, vd_to_axi_desc(vd));
vchan_cookie_complete(vd);
/* Try to restart the controller */
axi_chan_start_first_queued(chan);
out:
spin_unlock_irqrestore(&chan->vc.lock, flags);
}
static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
{
int count = atomic_read(&chan->descs_allocated);
struct axi_dma_hw_desc *hw_desc;
struct axi_dma_desc *desc;
struct virt_dma_desc *vd;
unsigned long flags;
u64 llp;
int i;
spin_lock_irqsave(&chan->vc.lock, flags);
if (unlikely(axi_chan_is_hw_enable(chan))) {
dev_err(chan2dev(chan), "BUG: %s caught DWAXIDMAC_IRQ_DMA_TRF, but channel not idle!\n",
axi_chan_name(chan));
axi_chan_disable(chan);
}
/* The completed descriptor currently is in the head of vc list */
vd = vchan_next_desc(&chan->vc);
if (!vd) {
dev_err(chan2dev(chan), "BUG: %s, IRQ with no descriptors\n",
axi_chan_name(chan));
goto out;
}
if (chan->cyclic) {
desc = vd_to_axi_desc(vd);
if (desc) {
llp = lo_hi_readq(chan->chan_regs + CH_LLP);
for (i = 0; i < count; i++) {
hw_desc = &desc->hw_desc[i];
if (hw_desc->llp == llp) {
axi_chan_irq_clear(chan, hw_desc->lli->status_lo);
hw_desc->lli->ctl_hi |= CH_CTL_H_LLI_VALID;
desc->completed_blocks = i;
if (((hw_desc->len * (i + 1)) % desc->period_len) == 0)
vchan_cyclic_callback(vd);
break;
}
}
axi_chan_enable(chan);
}
} else {
/* Remove the completed descriptor from issued list before completing */
list_del(&vd->node);
vchan_cookie_complete(vd);
/* Submit queued descriptors after processing the completed ones */
axi_chan_start_first_queued(chan);
}
out:
spin_unlock_irqrestore(&chan->vc.lock, flags);
}
static irqreturn_t dw_axi_dma_interrupt(int irq, void *dev_id)
{
struct axi_dma_chip *chip = dev_id;
struct dw_axi_dma *dw = chip->dw;
struct axi_dma_chan *chan;
u32 status, i;
/* Disable DMAC interrupts. We'll enable them after processing channels */
axi_dma_irq_disable(chip);
/* Poll, clear and process every channel interrupt status */
for (i = 0; i < dw->hdata->nr_channels; i++) {
chan = &dw->chan[i];
status = axi_chan_irq_read(chan);
axi_chan_irq_clear(chan, status);
dev_vdbg(chip->dev, "%s %u IRQ status: 0x%08x\n",
axi_chan_name(chan), i, status);
if (status & DWAXIDMAC_IRQ_ALL_ERR)
axi_chan_handle_err(chan, status);
else if (status & DWAXIDMAC_IRQ_DMA_TRF)
axi_chan_block_xfer_complete(chan);
}
/* Re-enable interrupts */
axi_dma_irq_enable(chip);
return IRQ_HANDLED;
}
static int dma_chan_terminate_all(struct dma_chan *dchan)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
u32 chan_active = BIT(chan->id) << DMAC_CHAN_EN_SHIFT;
unsigned long flags;
u32 val;
int ret;
LIST_HEAD(head);
axi_chan_disable(chan);
ret = readl_poll_timeout_atomic(chan->chip->regs + DMAC_CHEN, val,
!(val & chan_active), 1000, 50000);
if (ret == -ETIMEDOUT)
dev_warn(dchan2dev(dchan),
"%s failed to stop\n", axi_chan_name(chan));
if (chan->direction != DMA_MEM_TO_MEM)
dw_axi_dma_set_hw_channel(chan, false);
if (chan->direction == DMA_MEM_TO_DEV)
dw_axi_dma_set_byte_halfword(chan, false);
spin_lock_irqsave(&chan->vc.lock, flags);
vchan_get_all_descriptors(&chan->vc, &head);
chan->cyclic = false;
spin_unlock_irqrestore(&chan->vc.lock, flags);
vchan_dma_desc_free_list(&chan->vc, &head);
dev_vdbg(dchan2dev(dchan), "terminated: %s\n", axi_chan_name(chan));
return 0;
}
static int dma_chan_pause(struct dma_chan *dchan)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
unsigned long flags;
unsigned int timeout = 20; /* timeout iterations */
u32 val;
spin_lock_irqsave(&chan->vc.lock, flags);
if (chan->chip->dw->hdata->reg_map_8_channels) {
val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
val |= BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT |
BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT;
axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
} else {
val = axi_dma_ioread32(chan->chip, DMAC_CHSUSPREG);
val |= BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT |
BIT(chan->id) << DMAC_CHAN_SUSP2_WE_SHIFT;
axi_dma_iowrite32(chan->chip, DMAC_CHSUSPREG, val);
}
do {
if (axi_chan_irq_read(chan) & DWAXIDMAC_IRQ_SUSPENDED)
break;
udelay(2);
} while (--timeout);
axi_chan_irq_clear(chan, DWAXIDMAC_IRQ_SUSPENDED);
chan->is_paused = true;
spin_unlock_irqrestore(&chan->vc.lock, flags);
return timeout ? 0 : -EAGAIN;
}
/* Called in chan locked context */
static inline void axi_chan_resume(struct axi_dma_chan *chan)
{
u32 val;
if (chan->chip->dw->hdata->reg_map_8_channels) {
val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT);
val |= (BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT);
axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
} else {
val = axi_dma_ioread32(chan->chip, DMAC_CHSUSPREG);
val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT);
val |= (BIT(chan->id) << DMAC_CHAN_SUSP2_WE_SHIFT);
axi_dma_iowrite32(chan->chip, DMAC_CHSUSPREG, val);
}
chan->is_paused = false;
}
static int dma_chan_resume(struct dma_chan *dchan)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
unsigned long flags;
spin_lock_irqsave(&chan->vc.lock, flags);
if (chan->is_paused)
axi_chan_resume(chan);
spin_unlock_irqrestore(&chan->vc.lock, flags);
return 0;
}
static int axi_dma_suspend(struct axi_dma_chip *chip)
{
axi_dma_irq_disable(chip);
axi_dma_disable(chip);
clk_disable_unprepare(chip->core_clk);
clk_disable_unprepare(chip->cfgr_clk);
return 0;
}
static int axi_dma_resume(struct axi_dma_chip *chip)
{
int ret;
ret = clk_prepare_enable(chip->cfgr_clk);
if (ret < 0)
return ret;
ret = clk_prepare_enable(chip->core_clk);
if (ret < 0)
return ret;
axi_dma_enable(chip);
axi_dma_irq_enable(chip);
return 0;
}
static int __maybe_unused axi_dma_runtime_suspend(struct device *dev)
{
struct axi_dma_chip *chip = dev_get_drvdata(dev);
return axi_dma_suspend(chip);
}
static int __maybe_unused axi_dma_runtime_resume(struct device *dev)
{
struct axi_dma_chip *chip = dev_get_drvdata(dev);
return axi_dma_resume(chip);
}
static struct dma_chan *dw_axi_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct dw_axi_dma *dw = ofdma->of_dma_data;
struct axi_dma_chan *chan;
struct dma_chan *dchan;
dchan = dma_get_any_slave_channel(&dw->dma);
if (!dchan)
return NULL;
chan = dchan_to_axi_dma_chan(dchan);
chan->hw_handshake_num = dma_spec->args[0];
return dchan;
}
static int parse_device_properties(struct axi_dma_chip *chip)
{
struct device *dev = chip->dev;
u32 tmp, carr[DMAC_MAX_CHANNELS];
int ret;
ret = device_property_read_u32(dev, "dma-channels", &tmp);
if (ret)
return ret;
if (tmp == 0 || tmp > DMAC_MAX_CHANNELS)
return -EINVAL;
chip->dw->hdata->nr_channels = tmp;
if (tmp <= DMA_REG_MAP_CH_REF)
chip->dw->hdata->reg_map_8_channels = true;
ret = device_property_read_u32(dev, "snps,dma-masters", &tmp);
if (ret)
return ret;
if (tmp == 0 || tmp > DMAC_MAX_MASTERS)
return -EINVAL;
chip->dw->hdata->nr_masters = tmp;
ret = device_property_read_u32(dev, "snps,data-width", &tmp);
if (ret)
return ret;
if (tmp > DWAXIDMAC_TRANS_WIDTH_MAX)
return -EINVAL;
chip->dw->hdata->m_data_width = tmp;
ret = device_property_read_u32_array(dev, "snps,block-size", carr,
chip->dw->hdata->nr_channels);
if (ret)
return ret;
for (tmp = 0; tmp < chip->dw->hdata->nr_channels; tmp++) {
if (carr[tmp] == 0 || carr[tmp] > DMAC_MAX_BLK_SIZE)
return -EINVAL;
chip->dw->hdata->block_size[tmp] = carr[tmp];
}
ret = device_property_read_u32_array(dev, "snps,priority", carr,
chip->dw->hdata->nr_channels);
if (ret)
return ret;
/* Priority value must be programmed within [0:nr_channels-1] range */
for (tmp = 0; tmp < chip->dw->hdata->nr_channels; tmp++) {
if (carr[tmp] >= chip->dw->hdata->nr_channels)
return -EINVAL;
chip->dw->hdata->priority[tmp] = carr[tmp];
}
/* axi-max-burst-len is optional property */
ret = device_property_read_u32(dev, "snps,axi-max-burst-len", &tmp);
if (!ret) {
if (tmp > DWAXIDMAC_ARWLEN_MAX + 1)
return -EINVAL;
if (tmp < DWAXIDMAC_ARWLEN_MIN + 1)
return -EINVAL;
chip->dw->hdata->restrict_axi_burst_len = true;
chip->dw->hdata->axi_rw_burst_len = tmp;
}
return 0;
}
static int dw_probe(struct platform_device *pdev)
{
struct axi_dma_chip *chip;
struct dw_axi_dma *dw;
struct dw_axi_dma_hcfg *hdata;
struct reset_control *resets;
unsigned int flags;
u32 i;
int ret;
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
if (!dw)
return -ENOMEM;
hdata = devm_kzalloc(&pdev->dev, sizeof(*hdata), GFP_KERNEL);
if (!hdata)
return -ENOMEM;
chip->dw = dw;
chip->dev = &pdev->dev;
chip->dw->hdata = hdata;
chip->irq = platform_get_irq(pdev, 0);
if (chip->irq < 0)
return chip->irq;
chip->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(chip->regs))
return PTR_ERR(chip->regs);
flags = (uintptr_t)of_device_get_match_data(&pdev->dev);
if (flags & AXI_DMA_FLAG_HAS_APB_REGS) {
chip->apb_regs = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(chip->apb_regs))
return PTR_ERR(chip->apb_regs);
}
if (flags & AXI_DMA_FLAG_HAS_RESETS) {
resets = devm_reset_control_array_get_exclusive(&pdev->dev);
if (IS_ERR(resets))
return PTR_ERR(resets);
ret = reset_control_deassert(resets);
if (ret)
return ret;
}
chip->dw->hdata->use_cfg2 = !!(flags & AXI_DMA_FLAG_USE_CFG2);
chip->core_clk = devm_clk_get(chip->dev, "core-clk");
if (IS_ERR(chip->core_clk))
return PTR_ERR(chip->core_clk);
chip->cfgr_clk = devm_clk_get(chip->dev, "cfgr-clk");
if (IS_ERR(chip->cfgr_clk))
return PTR_ERR(chip->cfgr_clk);
ret = parse_device_properties(chip);
if (ret)
return ret;
dw->chan = devm_kcalloc(chip->dev, hdata->nr_channels,
sizeof(*dw->chan), GFP_KERNEL);
if (!dw->chan)
return -ENOMEM;
ret = devm_request_irq(chip->dev, chip->irq, dw_axi_dma_interrupt,
IRQF_SHARED, KBUILD_MODNAME, chip);
if (ret)
return ret;
INIT_LIST_HEAD(&dw->dma.channels);
for (i = 0; i < hdata->nr_channels; i++) {
struct axi_dma_chan *chan = &dw->chan[i];
chan->chip = chip;
chan->id = i;
chan->chan_regs = chip->regs + COMMON_REG_LEN + i * CHAN_REG_LEN;
atomic_set(&chan->descs_allocated, 0);
chan->vc.desc_free = vchan_desc_put;
vchan_init(&chan->vc, &dw->dma);
}
/* Set capabilities */
dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
dma_cap_set(DMA_CYCLIC, dw->dma.cap_mask);
/* DMA capabilities */
dw->dma.max_burst = hdata->axi_rw_burst_len;
dw->dma.src_addr_widths = AXI_DMA_BUSWIDTHS;
dw->dma.dst_addr_widths = AXI_DMA_BUSWIDTHS;
dw->dma.directions = BIT(DMA_MEM_TO_MEM);
dw->dma.directions |= BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
dw->dma.dev = chip->dev;
dw->dma.device_tx_status = dma_chan_tx_status;
dw->dma.device_issue_pending = dma_chan_issue_pending;
dw->dma.device_terminate_all = dma_chan_terminate_all;
dw->dma.device_pause = dma_chan_pause;
dw->dma.device_resume = dma_chan_resume;
dw->dma.device_alloc_chan_resources = dma_chan_alloc_chan_resources;
dw->dma.device_free_chan_resources = dma_chan_free_chan_resources;
dw->dma.device_prep_dma_memcpy = dma_chan_prep_dma_memcpy;
dw->dma.device_synchronize = dw_axi_dma_synchronize;
dw->dma.device_config = dw_axi_dma_chan_slave_config;
dw->dma.device_prep_slave_sg = dw_axi_dma_chan_prep_slave_sg;
dw->dma.device_prep_dma_cyclic = dw_axi_dma_chan_prep_cyclic;
/*
* Synopsis DesignWare AxiDMA datasheet mentioned Maximum
* supported blocks is 1024. Device register width is 4 bytes.
* Therefore, set constraint to 1024 * 4.
*/
dw->dma.dev->dma_parms = &dw->dma_parms;
dma_set_max_seg_size(&pdev->dev, MAX_BLOCK_SIZE);
platform_set_drvdata(pdev, chip);
pm_runtime_enable(chip->dev);
/*
* We can't just call pm_runtime_get here instead of
* pm_runtime_get_noresume + axi_dma_resume because we need
* driver to work also without Runtime PM.
*/
pm_runtime_get_noresume(chip->dev);
ret = axi_dma_resume(chip);
if (ret < 0)
goto err_pm_disable;
axi_dma_hw_init(chip);
pm_runtime_put(chip->dev);
ret = dmaenginem_async_device_register(&dw->dma);
if (ret)
goto err_pm_disable;
/* Register with OF helpers for DMA lookups */
ret = of_dma_controller_register(pdev->dev.of_node,
dw_axi_dma_of_xlate, dw);
if (ret < 0)
dev_warn(&pdev->dev,
"Failed to register OF DMA controller, fallback to MEM_TO_MEM mode\n");
dev_info(chip->dev, "DesignWare AXI DMA Controller, %d channels\n",
dw->hdata->nr_channels);
return 0;
err_pm_disable:
pm_runtime_disable(chip->dev);
return ret;
}
static int dw_remove(struct platform_device *pdev)
{
struct axi_dma_chip *chip = platform_get_drvdata(pdev);
struct dw_axi_dma *dw = chip->dw;
struct axi_dma_chan *chan, *_chan;
u32 i;
/* Enable clk before accessing to registers */
clk_prepare_enable(chip->cfgr_clk);
clk_prepare_enable(chip->core_clk);
axi_dma_irq_disable(chip);
for (i = 0; i < dw->hdata->nr_channels; i++) {
axi_chan_disable(&chip->dw->chan[i]);
axi_chan_irq_disable(&chip->dw->chan[i], DWAXIDMAC_IRQ_ALL);
}
axi_dma_disable(chip);
pm_runtime_disable(chip->dev);
axi_dma_suspend(chip);
devm_free_irq(chip->dev, chip->irq, chip);
of_dma_controller_free(chip->dev->of_node);
list_for_each_entry_safe(chan, _chan, &dw->dma.channels,
vc.chan.device_node) {
list_del(&chan->vc.chan.device_node);
tasklet_kill(&chan->vc.task);
}
return 0;
}
static const struct dev_pm_ops dw_axi_dma_pm_ops = {
SET_RUNTIME_PM_OPS(axi_dma_runtime_suspend, axi_dma_runtime_resume, NULL)
};
static const struct of_device_id dw_dma_of_id_table[] = {
{
.compatible = "snps,axi-dma-1.01a"
}, {
.compatible = "intel,kmb-axi-dma",
.data = (void *)AXI_DMA_FLAG_HAS_APB_REGS,
}, {
.compatible = "starfive,jh7110-axi-dma",
.data = (void *)(AXI_DMA_FLAG_HAS_RESETS | AXI_DMA_FLAG_USE_CFG2),
},
{}
};
MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
static struct platform_driver dw_driver = {
.probe = dw_probe,
.remove = dw_remove,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = dw_dma_of_id_table,
.pm = &dw_axi_dma_pm_ops,
},
};
module_platform_driver(dw_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Synopsys DesignWare AXI DMA Controller platform driver");
MODULE_AUTHOR("Eugeniy Paltsev <[email protected]>");
| linux-master | drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel I/OAT DMA Linux driver
* Copyright(c) 2004 - 2015 Intel Corporation.
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/gfp.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/prefetch.h>
#include "../dmaengine.h"
#include "registers.h"
#include "hw.h"
#include "dma.h"
#define MAX_SCF 256
/* provide a lookup table for setting the source address in the base or
* extended descriptor of an xor or pq descriptor
*/
static const u8 xor_idx_to_desc = 0xe0;
static const u8 xor_idx_to_field[] = { 1, 4, 5, 6, 7, 0, 1, 2 };
static const u8 pq_idx_to_desc = 0xf8;
static const u8 pq16_idx_to_desc[] = { 0, 0, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2 };
static const u8 pq_idx_to_field[] = { 1, 4, 5, 0, 1, 2, 4, 5 };
static const u8 pq16_idx_to_field[] = { 1, 4, 1, 2, 3, 4, 5, 6, 7,
0, 1, 2, 3, 4, 5, 6 };
static void xor_set_src(struct ioat_raw_descriptor *descs[2],
dma_addr_t addr, u32 offset, int idx)
{
struct ioat_raw_descriptor *raw = descs[xor_idx_to_desc >> idx & 1];
raw->field[xor_idx_to_field[idx]] = addr + offset;
}
static dma_addr_t pq_get_src(struct ioat_raw_descriptor *descs[2], int idx)
{
struct ioat_raw_descriptor *raw = descs[pq_idx_to_desc >> idx & 1];
return raw->field[pq_idx_to_field[idx]];
}
static dma_addr_t pq16_get_src(struct ioat_raw_descriptor *desc[3], int idx)
{
struct ioat_raw_descriptor *raw = desc[pq16_idx_to_desc[idx]];
return raw->field[pq16_idx_to_field[idx]];
}
static void pq_set_src(struct ioat_raw_descriptor *descs[2],
dma_addr_t addr, u32 offset, u8 coef, int idx)
{
struct ioat_pq_descriptor *pq = (struct ioat_pq_descriptor *) descs[0];
struct ioat_raw_descriptor *raw = descs[pq_idx_to_desc >> idx & 1];
raw->field[pq_idx_to_field[idx]] = addr + offset;
pq->coef[idx] = coef;
}
static void pq16_set_src(struct ioat_raw_descriptor *desc[3],
dma_addr_t addr, u32 offset, u8 coef, unsigned idx)
{
struct ioat_pq_descriptor *pq = (struct ioat_pq_descriptor *)desc[0];
struct ioat_pq16a_descriptor *pq16 =
(struct ioat_pq16a_descriptor *)desc[1];
struct ioat_raw_descriptor *raw = desc[pq16_idx_to_desc[idx]];
raw->field[pq16_idx_to_field[idx]] = addr + offset;
if (idx < 8)
pq->coef[idx] = coef;
else
pq16->coef[idx - 8] = coef;
}
static struct ioat_sed_ent *
ioat3_alloc_sed(struct ioatdma_device *ioat_dma, unsigned int hw_pool)
{
struct ioat_sed_ent *sed;
gfp_t flags = __GFP_ZERO | GFP_ATOMIC;
sed = kmem_cache_alloc(ioat_sed_cache, flags);
if (!sed)
return NULL;
sed->hw_pool = hw_pool;
sed->hw = dma_pool_alloc(ioat_dma->sed_hw_pool[hw_pool],
flags, &sed->dma);
if (!sed->hw) {
kmem_cache_free(ioat_sed_cache, sed);
return NULL;
}
return sed;
}
struct dma_async_tx_descriptor *
ioat_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
dma_addr_t dma_src, size_t len, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioat_dma_descriptor *hw;
struct ioat_ring_ent *desc;
dma_addr_t dst = dma_dest;
dma_addr_t src = dma_src;
size_t total_len = len;
int num_descs, idx, i;
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
num_descs = ioat_xferlen_to_descs(ioat_chan, len);
if (likely(num_descs) &&
ioat_check_space_lock(ioat_chan, num_descs) == 0)
idx = ioat_chan->head;
else
return NULL;
i = 0;
do {
size_t copy = min_t(size_t, len, 1 << ioat_chan->xfercap_log);
desc = ioat_get_ring_ent(ioat_chan, idx + i);
hw = desc->hw;
hw->size = copy;
hw->ctl = 0;
hw->src_addr = src;
hw->dst_addr = dst;
len -= copy;
dst += copy;
src += copy;
dump_desc_dbg(ioat_chan, desc);
} while (++i < num_descs);
desc->txd.flags = flags;
desc->len = total_len;
hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
hw->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
hw->ctl_f.compl_write = 1;
dump_desc_dbg(ioat_chan, desc);
/* we leave the channel locked to ensure in order submission */
return &desc->txd;
}
static struct dma_async_tx_descriptor *
__ioat_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result,
dma_addr_t dest, dma_addr_t *src, unsigned int src_cnt,
size_t len, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioat_ring_ent *compl_desc;
struct ioat_ring_ent *desc;
struct ioat_ring_ent *ext;
size_t total_len = len;
struct ioat_xor_descriptor *xor;
struct ioat_xor_ext_descriptor *xor_ex = NULL;
struct ioat_dma_descriptor *hw;
int num_descs, with_ext, idx, i;
u32 offset = 0;
u8 op = result ? IOAT_OP_XOR_VAL : IOAT_OP_XOR;
BUG_ON(src_cnt < 2);
num_descs = ioat_xferlen_to_descs(ioat_chan, len);
/* we need 2x the number of descriptors to cover greater than 5
* sources
*/
if (src_cnt > 5) {
with_ext = 1;
num_descs *= 2;
} else
with_ext = 0;
/* completion writes from the raid engine may pass completion
* writes from the legacy engine, so we need one extra null
* (legacy) descriptor to ensure all completion writes arrive in
* order.
*/
if (likely(num_descs) &&
ioat_check_space_lock(ioat_chan, num_descs+1) == 0)
idx = ioat_chan->head;
else
return NULL;
i = 0;
do {
struct ioat_raw_descriptor *descs[2];
size_t xfer_size = min_t(size_t,
len, 1 << ioat_chan->xfercap_log);
int s;
desc = ioat_get_ring_ent(ioat_chan, idx + i);
xor = desc->xor;
/* save a branch by unconditionally retrieving the
* extended descriptor xor_set_src() knows to not write
* to it in the single descriptor case
*/
ext = ioat_get_ring_ent(ioat_chan, idx + i + 1);
xor_ex = ext->xor_ex;
descs[0] = (struct ioat_raw_descriptor *) xor;
descs[1] = (struct ioat_raw_descriptor *) xor_ex;
for (s = 0; s < src_cnt; s++)
xor_set_src(descs, src[s], offset, s);
xor->size = xfer_size;
xor->dst_addr = dest + offset;
xor->ctl = 0;
xor->ctl_f.op = op;
xor->ctl_f.src_cnt = src_cnt_to_hw(src_cnt);
len -= xfer_size;
offset += xfer_size;
dump_desc_dbg(ioat_chan, desc);
} while ((i += 1 + with_ext) < num_descs);
/* last xor descriptor carries the unmap parameters and fence bit */
desc->txd.flags = flags;
desc->len = total_len;
if (result)
desc->result = result;
xor->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
/* completion descriptor carries interrupt bit */
compl_desc = ioat_get_ring_ent(ioat_chan, idx + i);
compl_desc->txd.flags = flags & DMA_PREP_INTERRUPT;
hw = compl_desc->hw;
hw->ctl = 0;
hw->ctl_f.null = 1;
hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
hw->ctl_f.compl_write = 1;
hw->size = NULL_DESC_BUFFER_SIZE;
dump_desc_dbg(ioat_chan, compl_desc);
/* we leave the channel locked to ensure in order submission */
return &compl_desc->txd;
}
struct dma_async_tx_descriptor *
ioat_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
unsigned int src_cnt, size_t len, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
return __ioat_prep_xor_lock(chan, NULL, dest, src, src_cnt, len, flags);
}
struct dma_async_tx_descriptor *
ioat_prep_xor_val(struct dma_chan *chan, dma_addr_t *src,
unsigned int src_cnt, size_t len,
enum sum_check_flags *result, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
/* the cleanup routine only sets bits on validate failure, it
* does not clear bits on validate success... so clear it here
*/
*result = 0;
return __ioat_prep_xor_lock(chan, result, src[0], &src[1],
src_cnt - 1, len, flags);
}
static void
dump_pq_desc_dbg(struct ioatdma_chan *ioat_chan, struct ioat_ring_ent *desc,
struct ioat_ring_ent *ext)
{
struct device *dev = to_dev(ioat_chan);
struct ioat_pq_descriptor *pq = desc->pq;
struct ioat_pq_ext_descriptor *pq_ex = ext ? ext->pq_ex : NULL;
struct ioat_raw_descriptor *descs[] = { (void *) pq, (void *) pq_ex };
int src_cnt = src_cnt_to_sw(pq->ctl_f.src_cnt);
int i;
dev_dbg(dev, "desc[%d]: (%#llx->%#llx) flags: %#x"
" sz: %#10.8x ctl: %#x (op: %#x int: %d compl: %d pq: '%s%s'"
" src_cnt: %d)\n",
desc_id(desc), (unsigned long long) desc->txd.phys,
(unsigned long long) (pq_ex ? pq_ex->next : pq->next),
desc->txd.flags, pq->size, pq->ctl, pq->ctl_f.op,
pq->ctl_f.int_en, pq->ctl_f.compl_write,
pq->ctl_f.p_disable ? "" : "p", pq->ctl_f.q_disable ? "" : "q",
pq->ctl_f.src_cnt);
for (i = 0; i < src_cnt; i++)
dev_dbg(dev, "\tsrc[%d]: %#llx coef: %#x\n", i,
(unsigned long long) pq_get_src(descs, i), pq->coef[i]);
dev_dbg(dev, "\tP: %#llx\n", pq->p_addr);
dev_dbg(dev, "\tQ: %#llx\n", pq->q_addr);
dev_dbg(dev, "\tNEXT: %#llx\n", pq->next);
}
static void dump_pq16_desc_dbg(struct ioatdma_chan *ioat_chan,
struct ioat_ring_ent *desc)
{
struct device *dev = to_dev(ioat_chan);
struct ioat_pq_descriptor *pq = desc->pq;
struct ioat_raw_descriptor *descs[] = { (void *)pq,
(void *)pq,
(void *)pq };
int src_cnt = src16_cnt_to_sw(pq->ctl_f.src_cnt);
int i;
if (desc->sed) {
descs[1] = (void *)desc->sed->hw;
descs[2] = (void *)desc->sed->hw + 64;
}
dev_dbg(dev, "desc[%d]: (%#llx->%#llx) flags: %#x"
" sz: %#x ctl: %#x (op: %#x int: %d compl: %d pq: '%s%s'"
" src_cnt: %d)\n",
desc_id(desc), (unsigned long long) desc->txd.phys,
(unsigned long long) pq->next,
desc->txd.flags, pq->size, pq->ctl,
pq->ctl_f.op, pq->ctl_f.int_en,
pq->ctl_f.compl_write,
pq->ctl_f.p_disable ? "" : "p", pq->ctl_f.q_disable ? "" : "q",
pq->ctl_f.src_cnt);
for (i = 0; i < src_cnt; i++) {
dev_dbg(dev, "\tsrc[%d]: %#llx coef: %#x\n", i,
(unsigned long long) pq16_get_src(descs, i),
pq->coef[i]);
}
dev_dbg(dev, "\tP: %#llx\n", pq->p_addr);
dev_dbg(dev, "\tQ: %#llx\n", pq->q_addr);
}
static struct dma_async_tx_descriptor *
__ioat_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result,
const dma_addr_t *dst, const dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf,
size_t len, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
struct ioat_ring_ent *compl_desc;
struct ioat_ring_ent *desc;
struct ioat_ring_ent *ext;
size_t total_len = len;
struct ioat_pq_descriptor *pq;
struct ioat_pq_ext_descriptor *pq_ex = NULL;
struct ioat_dma_descriptor *hw;
u32 offset = 0;
u8 op = result ? IOAT_OP_PQ_VAL : IOAT_OP_PQ;
int i, s, idx, with_ext, num_descs;
int cb32 = (ioat_dma->version < IOAT_VER_3_3) ? 1 : 0;
dev_dbg(to_dev(ioat_chan), "%s\n", __func__);
/* the engine requires at least two sources (we provide
* at least 1 implied source in the DMA_PREP_CONTINUE case)
*/
BUG_ON(src_cnt + dmaf_continue(flags) < 2);
num_descs = ioat_xferlen_to_descs(ioat_chan, len);
/* we need 2x the number of descriptors to cover greater than 3
* sources (we need 1 extra source in the q-only continuation
* case and 3 extra sources in the p+q continuation case.
*/
if (src_cnt + dmaf_p_disabled_continue(flags) > 3 ||
(dmaf_continue(flags) && !dmaf_p_disabled_continue(flags))) {
with_ext = 1;
num_descs *= 2;
} else
with_ext = 0;
/* completion writes from the raid engine may pass completion
* writes from the legacy engine, so we need one extra null
* (legacy) descriptor to ensure all completion writes arrive in
* order.
*/
if (likely(num_descs) &&
ioat_check_space_lock(ioat_chan, num_descs + cb32) == 0)
idx = ioat_chan->head;
else
return NULL;
i = 0;
do {
struct ioat_raw_descriptor *descs[2];
size_t xfer_size = min_t(size_t, len,
1 << ioat_chan->xfercap_log);
desc = ioat_get_ring_ent(ioat_chan, idx + i);
pq = desc->pq;
/* save a branch by unconditionally retrieving the
* extended descriptor pq_set_src() knows to not write
* to it in the single descriptor case
*/
ext = ioat_get_ring_ent(ioat_chan, idx + i + with_ext);
pq_ex = ext->pq_ex;
descs[0] = (struct ioat_raw_descriptor *) pq;
descs[1] = (struct ioat_raw_descriptor *) pq_ex;
for (s = 0; s < src_cnt; s++)
pq_set_src(descs, src[s], offset, scf[s], s);
/* see the comment for dma_maxpq in include/linux/dmaengine.h */
if (dmaf_p_disabled_continue(flags))
pq_set_src(descs, dst[1], offset, 1, s++);
else if (dmaf_continue(flags)) {
pq_set_src(descs, dst[0], offset, 0, s++);
pq_set_src(descs, dst[1], offset, 1, s++);
pq_set_src(descs, dst[1], offset, 0, s++);
}
pq->size = xfer_size;
pq->p_addr = dst[0] + offset;
pq->q_addr = dst[1] + offset;
pq->ctl = 0;
pq->ctl_f.op = op;
/* we turn on descriptor write back error status */
if (ioat_dma->cap & IOAT_CAP_DWBES)
pq->ctl_f.wb_en = result ? 1 : 0;
pq->ctl_f.src_cnt = src_cnt_to_hw(s);
pq->ctl_f.p_disable = !!(flags & DMA_PREP_PQ_DISABLE_P);
pq->ctl_f.q_disable = !!(flags & DMA_PREP_PQ_DISABLE_Q);
len -= xfer_size;
offset += xfer_size;
} while ((i += 1 + with_ext) < num_descs);
/* last pq descriptor carries the unmap parameters and fence bit */
desc->txd.flags = flags;
desc->len = total_len;
if (result)
desc->result = result;
pq->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
dump_pq_desc_dbg(ioat_chan, desc, ext);
if (!cb32) {
pq->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
pq->ctl_f.compl_write = 1;
compl_desc = desc;
} else {
/* completion descriptor carries interrupt bit */
compl_desc = ioat_get_ring_ent(ioat_chan, idx + i);
compl_desc->txd.flags = flags & DMA_PREP_INTERRUPT;
hw = compl_desc->hw;
hw->ctl = 0;
hw->ctl_f.null = 1;
hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
hw->ctl_f.compl_write = 1;
hw->size = NULL_DESC_BUFFER_SIZE;
dump_desc_dbg(ioat_chan, compl_desc);
}
/* we leave the channel locked to ensure in order submission */
return &compl_desc->txd;
}
static struct dma_async_tx_descriptor *
__ioat_prep_pq16_lock(struct dma_chan *c, enum sum_check_flags *result,
const dma_addr_t *dst, const dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf,
size_t len, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
struct ioat_ring_ent *desc;
size_t total_len = len;
struct ioat_pq_descriptor *pq;
u32 offset = 0;
u8 op;
int i, s, idx, num_descs;
/* this function is only called with 9-16 sources */
op = result ? IOAT_OP_PQ_VAL_16S : IOAT_OP_PQ_16S;
dev_dbg(to_dev(ioat_chan), "%s\n", __func__);
num_descs = ioat_xferlen_to_descs(ioat_chan, len);
/*
* 16 source pq is only available on cb3.3 and has no completion
* write hw bug.
*/
if (num_descs && ioat_check_space_lock(ioat_chan, num_descs) == 0)
idx = ioat_chan->head;
else
return NULL;
i = 0;
do {
struct ioat_raw_descriptor *descs[4];
size_t xfer_size = min_t(size_t, len,
1 << ioat_chan->xfercap_log);
desc = ioat_get_ring_ent(ioat_chan, idx + i);
pq = desc->pq;
descs[0] = (struct ioat_raw_descriptor *) pq;
desc->sed = ioat3_alloc_sed(ioat_dma, (src_cnt-2) >> 3);
if (!desc->sed) {
dev_err(to_dev(ioat_chan),
"%s: no free sed entries\n", __func__);
return NULL;
}
pq->sed_addr = desc->sed->dma;
desc->sed->parent = desc;
descs[1] = (struct ioat_raw_descriptor *)desc->sed->hw;
descs[2] = (void *)descs[1] + 64;
for (s = 0; s < src_cnt; s++)
pq16_set_src(descs, src[s], offset, scf[s], s);
/* see the comment for dma_maxpq in include/linux/dmaengine.h */
if (dmaf_p_disabled_continue(flags))
pq16_set_src(descs, dst[1], offset, 1, s++);
else if (dmaf_continue(flags)) {
pq16_set_src(descs, dst[0], offset, 0, s++);
pq16_set_src(descs, dst[1], offset, 1, s++);
pq16_set_src(descs, dst[1], offset, 0, s++);
}
pq->size = xfer_size;
pq->p_addr = dst[0] + offset;
pq->q_addr = dst[1] + offset;
pq->ctl = 0;
pq->ctl_f.op = op;
pq->ctl_f.src_cnt = src16_cnt_to_hw(s);
/* we turn on descriptor write back error status */
if (ioat_dma->cap & IOAT_CAP_DWBES)
pq->ctl_f.wb_en = result ? 1 : 0;
pq->ctl_f.p_disable = !!(flags & DMA_PREP_PQ_DISABLE_P);
pq->ctl_f.q_disable = !!(flags & DMA_PREP_PQ_DISABLE_Q);
len -= xfer_size;
offset += xfer_size;
} while (++i < num_descs);
/* last pq descriptor carries the unmap parameters and fence bit */
desc->txd.flags = flags;
desc->len = total_len;
if (result)
desc->result = result;
pq->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
/* with cb3.3 we should be able to do completion w/o a null desc */
pq->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
pq->ctl_f.compl_write = 1;
dump_pq16_desc_dbg(ioat_chan, desc);
/* we leave the channel locked to ensure in order submission */
return &desc->txd;
}
static int src_cnt_flags(unsigned int src_cnt, unsigned long flags)
{
if (dmaf_p_disabled_continue(flags))
return src_cnt + 1;
else if (dmaf_continue(flags))
return src_cnt + 3;
else
return src_cnt;
}
struct dma_async_tx_descriptor *
ioat_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf, size_t len,
unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
/* specify valid address for disabled result */
if (flags & DMA_PREP_PQ_DISABLE_P)
dst[0] = dst[1];
if (flags & DMA_PREP_PQ_DISABLE_Q)
dst[1] = dst[0];
/* handle the single source multiply case from the raid6
* recovery path
*/
if ((flags & DMA_PREP_PQ_DISABLE_P) && src_cnt == 1) {
dma_addr_t single_source[2];
unsigned char single_source_coef[2];
BUG_ON(flags & DMA_PREP_PQ_DISABLE_Q);
single_source[0] = src[0];
single_source[1] = src[0];
single_source_coef[0] = scf[0];
single_source_coef[1] = 0;
return src_cnt_flags(src_cnt, flags) > 8 ?
__ioat_prep_pq16_lock(chan, NULL, dst, single_source,
2, single_source_coef, len,
flags) :
__ioat_prep_pq_lock(chan, NULL, dst, single_source, 2,
single_source_coef, len, flags);
} else {
return src_cnt_flags(src_cnt, flags) > 8 ?
__ioat_prep_pq16_lock(chan, NULL, dst, src, src_cnt,
scf, len, flags) :
__ioat_prep_pq_lock(chan, NULL, dst, src, src_cnt,
scf, len, flags);
}
}
struct dma_async_tx_descriptor *
ioat_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf, size_t len,
enum sum_check_flags *pqres, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
/* specify valid address for disabled result */
if (flags & DMA_PREP_PQ_DISABLE_P)
pq[0] = pq[1];
if (flags & DMA_PREP_PQ_DISABLE_Q)
pq[1] = pq[0];
/* the cleanup routine only sets bits on validate failure, it
* does not clear bits on validate success... so clear it here
*/
*pqres = 0;
return src_cnt_flags(src_cnt, flags) > 8 ?
__ioat_prep_pq16_lock(chan, pqres, pq, src, src_cnt, scf, len,
flags) :
__ioat_prep_pq_lock(chan, pqres, pq, src, src_cnt, scf, len,
flags);
}
struct dma_async_tx_descriptor *
ioat_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
unsigned int src_cnt, size_t len, unsigned long flags)
{
unsigned char scf[MAX_SCF];
dma_addr_t pq[2];
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
if (src_cnt > MAX_SCF)
return NULL;
memset(scf, 0, src_cnt);
pq[0] = dst;
flags |= DMA_PREP_PQ_DISABLE_Q;
pq[1] = dst; /* specify valid address for disabled result */
return src_cnt_flags(src_cnt, flags) > 8 ?
__ioat_prep_pq16_lock(chan, NULL, pq, src, src_cnt, scf, len,
flags) :
__ioat_prep_pq_lock(chan, NULL, pq, src, src_cnt, scf, len,
flags);
}
struct dma_async_tx_descriptor *
ioat_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
unsigned int src_cnt, size_t len,
enum sum_check_flags *result, unsigned long flags)
{
unsigned char scf[MAX_SCF];
dma_addr_t pq[2];
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
if (src_cnt > MAX_SCF)
return NULL;
/* the cleanup routine only sets bits on validate failure, it
* does not clear bits on validate success... so clear it here
*/
*result = 0;
memset(scf, 0, src_cnt);
pq[0] = src[0];
flags |= DMA_PREP_PQ_DISABLE_Q;
pq[1] = pq[0]; /* specify valid address for disabled result */
return src_cnt_flags(src_cnt, flags) > 8 ?
__ioat_prep_pq16_lock(chan, result, pq, &src[1], src_cnt - 1,
scf, len, flags) :
__ioat_prep_pq_lock(chan, result, pq, &src[1], src_cnt - 1,
scf, len, flags);
}
struct dma_async_tx_descriptor *
ioat_prep_interrupt_lock(struct dma_chan *c, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioat_ring_ent *desc;
struct ioat_dma_descriptor *hw;
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
if (ioat_check_space_lock(ioat_chan, 1) == 0)
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head);
else
return NULL;
hw = desc->hw;
hw->ctl = 0;
hw->ctl_f.null = 1;
hw->ctl_f.int_en = 1;
hw->ctl_f.fence = !!(flags & DMA_PREP_FENCE);
hw->ctl_f.compl_write = 1;
hw->size = NULL_DESC_BUFFER_SIZE;
hw->src_addr = 0;
hw->dst_addr = 0;
desc->txd.flags = flags;
desc->len = 1;
dump_desc_dbg(ioat_chan, desc);
/* we leave the channel locked to ensure in order submission */
return &desc->txd;
}
| linux-master | drivers/dma/ioat/prep.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel I/OAT DMA Linux driver
* Copyright(c) 2004 - 2015 Intel Corporation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/dmaengine.h>
#include <linux/pci.h>
#include "dma.h"
#include "registers.h"
#include "hw.h"
#include "../dmaengine.h"
static ssize_t cap_show(struct dma_chan *c, char *page)
{
struct dma_device *dma = c->device;
return sprintf(page, "copy%s%s%s%s%s\n",
dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "",
dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "",
dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "",
dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "",
dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : "");
}
struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap);
static ssize_t version_show(struct dma_chan *c, char *page)
{
struct dma_device *dma = c->device;
struct ioatdma_device *ioat_dma = to_ioatdma_device(dma);
return sprintf(page, "%d.%d\n",
ioat_dma->version >> 4, ioat_dma->version & 0xf);
}
struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);
static ssize_t
ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct ioat_sysfs_entry *entry;
struct ioatdma_chan *ioat_chan;
entry = container_of(attr, struct ioat_sysfs_entry, attr);
ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
if (!entry->show)
return -EIO;
return entry->show(&ioat_chan->dma_chan, page);
}
static ssize_t
ioat_attr_store(struct kobject *kobj, struct attribute *attr,
const char *page, size_t count)
{
struct ioat_sysfs_entry *entry;
struct ioatdma_chan *ioat_chan;
entry = container_of(attr, struct ioat_sysfs_entry, attr);
ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);
if (!entry->store)
return -EIO;
return entry->store(&ioat_chan->dma_chan, page, count);
}
const struct sysfs_ops ioat_sysfs_ops = {
.show = ioat_attr_show,
.store = ioat_attr_store,
};
void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type)
{
struct dma_device *dma = &ioat_dma->dma_dev;
struct dma_chan *c;
list_for_each_entry(c, &dma->channels, device_node) {
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct kobject *parent = &c->dev->device.kobj;
int err;
err = kobject_init_and_add(&ioat_chan->kobj, type,
parent, "quickdata");
if (err) {
dev_warn(to_dev(ioat_chan),
"sysfs init error (%d), continuing...\n", err);
kobject_put(&ioat_chan->kobj);
set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state);
}
}
}
void ioat_kobject_del(struct ioatdma_device *ioat_dma)
{
struct dma_device *dma = &ioat_dma->dma_dev;
struct dma_chan *c;
list_for_each_entry(c, &dma->channels, device_node) {
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
if (!test_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state)) {
kobject_del(&ioat_chan->kobj);
kobject_put(&ioat_chan->kobj);
}
}
}
static ssize_t ring_size_show(struct dma_chan *c, char *page)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
return sprintf(page, "%d\n", (1 << ioat_chan->alloc_order) & ~1);
}
static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);
static ssize_t ring_active_show(struct dma_chan *c, char *page)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
/* ...taken outside the lock, no need to be precise */
return sprintf(page, "%d\n", ioat_ring_active(ioat_chan));
}
static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
static ssize_t intr_coalesce_show(struct dma_chan *c, char *page)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
return sprintf(page, "%d\n", ioat_chan->intr_coalesce);
}
static ssize_t intr_coalesce_store(struct dma_chan *c, const char *page,
size_t count)
{
int intr_coalesce = 0;
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
if (sscanf(page, "%du", &intr_coalesce) != -1) {
if ((intr_coalesce < 0) ||
(intr_coalesce > IOAT_INTRDELAY_MASK))
return -EINVAL;
ioat_chan->intr_coalesce = intr_coalesce;
}
return count;
}
static struct ioat_sysfs_entry intr_coalesce_attr = __ATTR_RW(intr_coalesce);
static struct attribute *ioat_attrs[] = {
&ring_size_attr.attr,
&ring_active_attr.attr,
&ioat_cap_attr.attr,
&ioat_version_attr.attr,
&intr_coalesce_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(ioat);
struct kobj_type ioat_ktype = {
.sysfs_ops = &ioat_sysfs_ops,
.default_groups = ioat_groups,
};
| linux-master | drivers/dma/ioat/sysfs.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel I/OAT DMA Linux driver
* Copyright(c) 2004 - 2015 Intel Corporation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/workqueue.h>
#include <linux/prefetch.h>
#include <linux/dca.h>
#include <linux/sizes.h>
#include "dma.h"
#include "registers.h"
#include "hw.h"
#include "../dmaengine.h"
MODULE_VERSION(IOAT_DMA_VERSION);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Intel Corporation");
static const struct pci_device_id ioat_pci_tbl[] = {
/* I/OAT v3 platforms */
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
/* I/OAT v3.2 platforms */
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX4) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX5) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX6) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX7) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX8) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX9) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SKX) },
/* I/OAT v3.3 platforms */
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },
/* I/OAT v3.4 platforms */
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_ICX) },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
static void ioat_remove(struct pci_dev *pdev);
static void
ioat_init_channel(struct ioatdma_device *ioat_dma,
struct ioatdma_chan *ioat_chan, int idx);
static void ioat_intr_quirk(struct ioatdma_device *ioat_dma);
static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma);
static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma);
static int ioat_dca_enabled = 1;
module_param(ioat_dca_enabled, int, 0644);
MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
int ioat_pending_level = 7;
module_param(ioat_pending_level, int, 0644);
MODULE_PARM_DESC(ioat_pending_level,
"high-water mark for pushing ioat descriptors (default: 7)");
static char ioat_interrupt_style[32] = "msix";
module_param_string(ioat_interrupt_style, ioat_interrupt_style,
sizeof(ioat_interrupt_style), 0644);
MODULE_PARM_DESC(ioat_interrupt_style,
"set ioat interrupt style: msix (default), msi, intx");
struct kmem_cache *ioat_cache;
struct kmem_cache *ioat_sed_cache;
static bool is_jf_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_JSF0:
case PCI_DEVICE_ID_INTEL_IOAT_JSF1:
case PCI_DEVICE_ID_INTEL_IOAT_JSF2:
case PCI_DEVICE_ID_INTEL_IOAT_JSF3:
case PCI_DEVICE_ID_INTEL_IOAT_JSF4:
case PCI_DEVICE_ID_INTEL_IOAT_JSF5:
case PCI_DEVICE_ID_INTEL_IOAT_JSF6:
case PCI_DEVICE_ID_INTEL_IOAT_JSF7:
case PCI_DEVICE_ID_INTEL_IOAT_JSF8:
case PCI_DEVICE_ID_INTEL_IOAT_JSF9:
return true;
default:
return false;
}
}
static bool is_snb_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_SNB0:
case PCI_DEVICE_ID_INTEL_IOAT_SNB1:
case PCI_DEVICE_ID_INTEL_IOAT_SNB2:
case PCI_DEVICE_ID_INTEL_IOAT_SNB3:
case PCI_DEVICE_ID_INTEL_IOAT_SNB4:
case PCI_DEVICE_ID_INTEL_IOAT_SNB5:
case PCI_DEVICE_ID_INTEL_IOAT_SNB6:
case PCI_DEVICE_ID_INTEL_IOAT_SNB7:
case PCI_DEVICE_ID_INTEL_IOAT_SNB8:
case PCI_DEVICE_ID_INTEL_IOAT_SNB9:
return true;
default:
return false;
}
}
static bool is_ivb_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_IVB0:
case PCI_DEVICE_ID_INTEL_IOAT_IVB1:
case PCI_DEVICE_ID_INTEL_IOAT_IVB2:
case PCI_DEVICE_ID_INTEL_IOAT_IVB3:
case PCI_DEVICE_ID_INTEL_IOAT_IVB4:
case PCI_DEVICE_ID_INTEL_IOAT_IVB5:
case PCI_DEVICE_ID_INTEL_IOAT_IVB6:
case PCI_DEVICE_ID_INTEL_IOAT_IVB7:
case PCI_DEVICE_ID_INTEL_IOAT_IVB8:
case PCI_DEVICE_ID_INTEL_IOAT_IVB9:
return true;
default:
return false;
}
}
static bool is_hsw_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_HSW0:
case PCI_DEVICE_ID_INTEL_IOAT_HSW1:
case PCI_DEVICE_ID_INTEL_IOAT_HSW2:
case PCI_DEVICE_ID_INTEL_IOAT_HSW3:
case PCI_DEVICE_ID_INTEL_IOAT_HSW4:
case PCI_DEVICE_ID_INTEL_IOAT_HSW5:
case PCI_DEVICE_ID_INTEL_IOAT_HSW6:
case PCI_DEVICE_ID_INTEL_IOAT_HSW7:
case PCI_DEVICE_ID_INTEL_IOAT_HSW8:
case PCI_DEVICE_ID_INTEL_IOAT_HSW9:
return true;
default:
return false;
}
}
static bool is_bdx_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_BDX0:
case PCI_DEVICE_ID_INTEL_IOAT_BDX1:
case PCI_DEVICE_ID_INTEL_IOAT_BDX2:
case PCI_DEVICE_ID_INTEL_IOAT_BDX3:
case PCI_DEVICE_ID_INTEL_IOAT_BDX4:
case PCI_DEVICE_ID_INTEL_IOAT_BDX5:
case PCI_DEVICE_ID_INTEL_IOAT_BDX6:
case PCI_DEVICE_ID_INTEL_IOAT_BDX7:
case PCI_DEVICE_ID_INTEL_IOAT_BDX8:
case PCI_DEVICE_ID_INTEL_IOAT_BDX9:
return true;
default:
return false;
}
}
static inline bool is_skx_ioat(struct pci_dev *pdev)
{
return (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_SKX) ? true : false;
}
static bool is_xeon_cb32(struct pci_dev *pdev)
{
return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) ||
is_hsw_ioat(pdev) || is_bdx_ioat(pdev) || is_skx_ioat(pdev);
}
bool is_bwd_ioat(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_BWD0:
case PCI_DEVICE_ID_INTEL_IOAT_BWD1:
case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
/* even though not Atom, BDX-DE has same DMA silicon */
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
return true;
default:
return false;
}
}
static bool is_bwd_noraid(struct pci_dev *pdev)
{
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
return true;
default:
return false;
}
}
/*
* Perform a IOAT transaction to verify the HW works.
*/
#define IOAT_TEST_SIZE 2000
static void ioat_dma_test_callback(void *dma_async_param)
{
struct completion *cmp = dma_async_param;
complete(cmp);
}
/**
* ioat_dma_self_test - Perform a IOAT transaction to verify the HW works.
* @ioat_dma: dma device to be tested
*/
static int ioat_dma_self_test(struct ioatdma_device *ioat_dma)
{
int i;
u8 *src;
u8 *dest;
struct dma_device *dma = &ioat_dma->dma_dev;
struct device *dev = &ioat_dma->pdev->dev;
struct dma_chan *dma_chan;
struct dma_async_tx_descriptor *tx;
dma_addr_t dma_dest, dma_src;
dma_cookie_t cookie;
int err = 0;
struct completion cmp;
unsigned long tmo;
unsigned long flags;
src = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
if (!src)
return -ENOMEM;
dest = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
if (!dest) {
kfree(src);
return -ENOMEM;
}
/* Fill in src buffer */
for (i = 0; i < IOAT_TEST_SIZE; i++)
src[i] = (u8)i;
/* Start copy, using first DMA channel */
dma_chan = container_of(dma->channels.next, struct dma_chan,
device_node);
if (dma->device_alloc_chan_resources(dma_chan) < 1) {
dev_err(dev, "selftest cannot allocate chan resource\n");
err = -ENODEV;
goto out;
}
dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_src)) {
dev_err(dev, "mapping src buffer failed\n");
err = -ENOMEM;
goto free_resources;
}
dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, dma_dest)) {
dev_err(dev, "mapping dest buffer failed\n");
err = -ENOMEM;
goto unmap_src;
}
flags = DMA_PREP_INTERRUPT;
tx = ioat_dma->dma_dev.device_prep_dma_memcpy(dma_chan, dma_dest,
dma_src, IOAT_TEST_SIZE,
flags);
if (!tx) {
dev_err(dev, "Self-test prep failed, disabling\n");
err = -ENODEV;
goto unmap_dma;
}
async_tx_ack(tx);
init_completion(&cmp);
tx->callback = ioat_dma_test_callback;
tx->callback_param = &cmp;
cookie = tx->tx_submit(tx);
if (cookie < 0) {
dev_err(dev, "Self-test setup failed, disabling\n");
err = -ENODEV;
goto unmap_dma;
}
dma->device_issue_pending(dma_chan);
tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
if (tmo == 0 ||
dma->device_tx_status(dma_chan, cookie, NULL)
!= DMA_COMPLETE) {
dev_err(dev, "Self-test copy timed out, disabling\n");
err = -ENODEV;
goto unmap_dma;
}
if (memcmp(src, dest, IOAT_TEST_SIZE)) {
dev_err(dev, "Self-test copy failed compare, disabling\n");
err = -ENODEV;
goto unmap_dma;
}
unmap_dma:
dma_unmap_single(dev, dma_dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
unmap_src:
dma_unmap_single(dev, dma_src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
free_resources:
dma->device_free_chan_resources(dma_chan);
out:
kfree(src);
kfree(dest);
return err;
}
/**
* ioat_dma_setup_interrupts - setup interrupt handler
* @ioat_dma: ioat dma device
*/
int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma)
{
struct ioatdma_chan *ioat_chan;
struct pci_dev *pdev = ioat_dma->pdev;
struct device *dev = &pdev->dev;
struct msix_entry *msix;
int i, j, msixcnt;
int err = -EINVAL;
u8 intrctrl = 0;
if (!strcmp(ioat_interrupt_style, "msix"))
goto msix;
if (!strcmp(ioat_interrupt_style, "msi"))
goto msi;
if (!strcmp(ioat_interrupt_style, "intx"))
goto intx;
dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style);
goto err_no_irq;
msix:
/* The number of MSI-X vectors should equal the number of channels */
msixcnt = ioat_dma->chancnt;
for (i = 0; i < msixcnt; i++)
ioat_dma->msix_entries[i].entry = i;
err = pci_enable_msix_exact(pdev, ioat_dma->msix_entries, msixcnt);
if (err)
goto msi;
for (i = 0; i < msixcnt; i++) {
msix = &ioat_dma->msix_entries[i];
ioat_chan = ioat_chan_by_index(ioat_dma, i);
err = devm_request_irq(dev, msix->vector,
ioat_dma_do_interrupt_msix, 0,
"ioat-msix", ioat_chan);
if (err) {
for (j = 0; j < i; j++) {
msix = &ioat_dma->msix_entries[j];
ioat_chan = ioat_chan_by_index(ioat_dma, j);
devm_free_irq(dev, msix->vector, ioat_chan);
}
goto msi;
}
}
intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL;
ioat_dma->irq_mode = IOAT_MSIX;
goto done;
msi:
err = pci_enable_msi(pdev);
if (err)
goto intx;
err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0,
"ioat-msi", ioat_dma);
if (err) {
pci_disable_msi(pdev);
goto intx;
}
ioat_dma->irq_mode = IOAT_MSI;
goto done;
intx:
err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt,
IRQF_SHARED, "ioat-intx", ioat_dma);
if (err)
goto err_no_irq;
ioat_dma->irq_mode = IOAT_INTX;
done:
if (is_bwd_ioat(pdev))
ioat_intr_quirk(ioat_dma);
intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN;
writeb(intrctrl, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
return 0;
err_no_irq:
/* Disable all interrupt generation */
writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
ioat_dma->irq_mode = IOAT_NOIRQ;
dev_err(dev, "no usable interrupts\n");
return err;
}
static void ioat_disable_interrupts(struct ioatdma_device *ioat_dma)
{
/* Disable all interrupt generation */
writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
}
static int ioat_probe(struct ioatdma_device *ioat_dma)
{
int err = -ENODEV;
struct dma_device *dma = &ioat_dma->dma_dev;
struct pci_dev *pdev = ioat_dma->pdev;
struct device *dev = &pdev->dev;
ioat_dma->completion_pool = dma_pool_create("completion_pool", dev,
sizeof(u64),
SMP_CACHE_BYTES,
SMP_CACHE_BYTES);
if (!ioat_dma->completion_pool) {
err = -ENOMEM;
goto err_out;
}
ioat_enumerate_channels(ioat_dma);
dma_cap_set(DMA_MEMCPY, dma->cap_mask);
dma->dev = &pdev->dev;
if (!ioat_dma->chancnt) {
dev_err(dev, "channel enumeration error\n");
goto err_setup_interrupts;
}
err = ioat_dma_setup_interrupts(ioat_dma);
if (err)
goto err_setup_interrupts;
err = ioat3_dma_self_test(ioat_dma);
if (err)
goto err_self_test;
return 0;
err_self_test:
ioat_disable_interrupts(ioat_dma);
err_setup_interrupts:
dma_pool_destroy(ioat_dma->completion_pool);
err_out:
return err;
}
static int ioat_register(struct ioatdma_device *ioat_dma)
{
int err = dma_async_device_register(&ioat_dma->dma_dev);
if (err) {
ioat_disable_interrupts(ioat_dma);
dma_pool_destroy(ioat_dma->completion_pool);
}
return err;
}
static void ioat_dma_remove(struct ioatdma_device *ioat_dma)
{
struct dma_device *dma = &ioat_dma->dma_dev;
ioat_disable_interrupts(ioat_dma);
ioat_kobject_del(ioat_dma);
dma_async_device_unregister(dma);
}
/**
* ioat_enumerate_channels - find and initialize the device's channels
* @ioat_dma: the ioat dma device to be enumerated
*/
static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
{
struct ioatdma_chan *ioat_chan;
struct device *dev = &ioat_dma->pdev->dev;
struct dma_device *dma = &ioat_dma->dma_dev;
u8 xfercap_log;
int chancnt;
int i;
INIT_LIST_HEAD(&dma->channels);
chancnt = readb(ioat_dma->reg_base + IOAT_CHANCNT_OFFSET);
chancnt &= 0x1f; /* bits [4:0] valid */
if (chancnt > ARRAY_SIZE(ioat_dma->idx)) {
dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n",
chancnt, ARRAY_SIZE(ioat_dma->idx));
chancnt = ARRAY_SIZE(ioat_dma->idx);
}
xfercap_log = readb(ioat_dma->reg_base + IOAT_XFERCAP_OFFSET);
xfercap_log &= 0x1f; /* bits [4:0] valid */
if (xfercap_log == 0)
return;
dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log);
for (i = 0; i < chancnt; i++) {
ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL);
if (!ioat_chan)
break;
ioat_init_channel(ioat_dma, ioat_chan, i);
ioat_chan->xfercap_log = xfercap_log;
spin_lock_init(&ioat_chan->prep_lock);
if (ioat_reset_hw(ioat_chan)) {
i = 0;
break;
}
}
ioat_dma->chancnt = i;
}
/**
* ioat_free_chan_resources - release all the descriptors
* @c: the channel to be cleaned
*/
static void ioat_free_chan_resources(struct dma_chan *c)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
struct ioat_ring_ent *desc;
const int total_descs = 1 << ioat_chan->alloc_order;
int descs;
int i;
/* Before freeing channel resources first check
* if they have been previously allocated for this channel.
*/
if (!ioat_chan->ring)
return;
ioat_stop(ioat_chan);
if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state)) {
ioat_reset_hw(ioat_chan);
/* Put LTR to idle */
if (ioat_dma->version >= IOAT_VER_3_4)
writeb(IOAT_CHAN_LTR_SWSEL_IDLE,
ioat_chan->reg_base +
IOAT_CHAN_LTR_SWSEL_OFFSET);
}
spin_lock_bh(&ioat_chan->cleanup_lock);
spin_lock_bh(&ioat_chan->prep_lock);
descs = ioat_ring_space(ioat_chan);
dev_dbg(to_dev(ioat_chan), "freeing %d idle descriptors\n", descs);
for (i = 0; i < descs; i++) {
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head + i);
ioat_free_ring_ent(desc, c);
}
if (descs < total_descs)
dev_err(to_dev(ioat_chan), "Freeing %d in use descriptors!\n",
total_descs - descs);
for (i = 0; i < total_descs - descs; i++) {
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail + i);
dump_desc_dbg(ioat_chan, desc);
ioat_free_ring_ent(desc, c);
}
for (i = 0; i < ioat_chan->desc_chunks; i++) {
dma_free_coherent(to_dev(ioat_chan), IOAT_CHUNK_SIZE,
ioat_chan->descs[i].virt,
ioat_chan->descs[i].hw);
ioat_chan->descs[i].virt = NULL;
ioat_chan->descs[i].hw = 0;
}
ioat_chan->desc_chunks = 0;
kfree(ioat_chan->ring);
ioat_chan->ring = NULL;
ioat_chan->alloc_order = 0;
dma_pool_free(ioat_dma->completion_pool, ioat_chan->completion,
ioat_chan->completion_dma);
spin_unlock_bh(&ioat_chan->prep_lock);
spin_unlock_bh(&ioat_chan->cleanup_lock);
ioat_chan->last_completion = 0;
ioat_chan->completion_dma = 0;
ioat_chan->dmacount = 0;
}
/* ioat_alloc_chan_resources - allocate/initialize ioat descriptor ring
* @chan: channel to be initialized
*/
static int ioat_alloc_chan_resources(struct dma_chan *c)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioat_ring_ent **ring;
u64 status;
int order;
int i = 0;
u32 chanerr;
/* have we already been set up? */
if (ioat_chan->ring)
return 1 << ioat_chan->alloc_order;
/* Setup register to interrupt and write completion status on error */
writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
/* allocate a completion writeback area */
/* doing 2 32bit writes to mmio since 1 64b write doesn't work */
ioat_chan->completion =
dma_pool_zalloc(ioat_chan->ioat_dma->completion_pool,
GFP_NOWAIT, &ioat_chan->completion_dma);
if (!ioat_chan->completion)
return -ENOMEM;
writel(((u64)ioat_chan->completion_dma) & 0x00000000FFFFFFFF,
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
writel(((u64)ioat_chan->completion_dma) >> 32,
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
order = IOAT_MAX_ORDER;
ring = ioat_alloc_ring(c, order, GFP_NOWAIT);
if (!ring)
return -ENOMEM;
spin_lock_bh(&ioat_chan->cleanup_lock);
spin_lock_bh(&ioat_chan->prep_lock);
ioat_chan->ring = ring;
ioat_chan->head = 0;
ioat_chan->issued = 0;
ioat_chan->tail = 0;
ioat_chan->alloc_order = order;
set_bit(IOAT_RUN, &ioat_chan->state);
spin_unlock_bh(&ioat_chan->prep_lock);
spin_unlock_bh(&ioat_chan->cleanup_lock);
/* Setting up LTR values for 3.4 or later */
if (ioat_chan->ioat_dma->version >= IOAT_VER_3_4) {
u32 lat_val;
lat_val = IOAT_CHAN_LTR_ACTIVE_SNVAL |
IOAT_CHAN_LTR_ACTIVE_SNLATSCALE |
IOAT_CHAN_LTR_ACTIVE_SNREQMNT;
writel(lat_val, ioat_chan->reg_base +
IOAT_CHAN_LTR_ACTIVE_OFFSET);
lat_val = IOAT_CHAN_LTR_IDLE_SNVAL |
IOAT_CHAN_LTR_IDLE_SNLATSCALE |
IOAT_CHAN_LTR_IDLE_SNREQMNT;
writel(lat_val, ioat_chan->reg_base +
IOAT_CHAN_LTR_IDLE_OFFSET);
/* Select to active */
writeb(IOAT_CHAN_LTR_SWSEL_ACTIVE,
ioat_chan->reg_base +
IOAT_CHAN_LTR_SWSEL_OFFSET);
}
ioat_start_null_desc(ioat_chan);
/* check that we got off the ground */
do {
udelay(1);
status = ioat_chansts(ioat_chan);
} while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status));
if (is_ioat_active(status) || is_ioat_idle(status))
return 1 << ioat_chan->alloc_order;
chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
dev_WARN(to_dev(ioat_chan),
"failed to start channel chanerr: %#x\n", chanerr);
ioat_free_chan_resources(c);
return -EFAULT;
}
/* common channel initialization */
static void
ioat_init_channel(struct ioatdma_device *ioat_dma,
struct ioatdma_chan *ioat_chan, int idx)
{
struct dma_device *dma = &ioat_dma->dma_dev;
ioat_chan->ioat_dma = ioat_dma;
ioat_chan->reg_base = ioat_dma->reg_base + (0x80 * (idx + 1));
spin_lock_init(&ioat_chan->cleanup_lock);
ioat_chan->dma_chan.device = dma;
dma_cookie_init(&ioat_chan->dma_chan);
list_add_tail(&ioat_chan->dma_chan.device_node, &dma->channels);
ioat_dma->idx[idx] = ioat_chan;
timer_setup(&ioat_chan->timer, ioat_timer_event, 0);
tasklet_setup(&ioat_chan->cleanup_task, ioat_cleanup_event);
}
#define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */
static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
{
int i, src_idx;
struct page *dest;
struct page *xor_srcs[IOAT_NUM_SRC_TEST];
struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1];
dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1];
dma_addr_t dest_dma;
struct dma_async_tx_descriptor *tx;
struct dma_chan *dma_chan;
dma_cookie_t cookie;
u8 cmp_byte = 0;
u32 cmp_word;
u32 xor_val_result;
int err = 0;
struct completion cmp;
unsigned long tmo;
struct device *dev = &ioat_dma->pdev->dev;
struct dma_device *dma = &ioat_dma->dma_dev;
u8 op = 0;
dev_dbg(dev, "%s\n", __func__);
if (!dma_has_cap(DMA_XOR, dma->cap_mask))
return 0;
for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
if (!xor_srcs[src_idx]) {
while (src_idx--)
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
}
dest = alloc_page(GFP_KERNEL);
if (!dest) {
while (src_idx--)
__free_page(xor_srcs[src_idx]);
return -ENOMEM;
}
/* Fill in src buffers */
for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
u8 *ptr = page_address(xor_srcs[src_idx]);
for (i = 0; i < PAGE_SIZE; i++)
ptr[i] = (1 << src_idx);
}
for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++)
cmp_byte ^= (u8) (1 << src_idx);
cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
(cmp_byte << 8) | cmp_byte;
memset(page_address(dest), 0, PAGE_SIZE);
dma_chan = container_of(dma->channels.next, struct dma_chan,
device_node);
if (dma->device_alloc_chan_resources(dma_chan) < 1) {
err = -ENODEV;
goto out;
}
/* test xor */
op = IOAT_OP_XOR;
dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, dest_dma)) {
err = -ENOMEM;
goto free_resources;
}
for (i = 0; i < IOAT_NUM_SRC_TEST; i++) {
dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_srcs[i])) {
err = -ENOMEM;
goto dma_unmap;
}
}
tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
IOAT_NUM_SRC_TEST, PAGE_SIZE,
DMA_PREP_INTERRUPT);
if (!tx) {
dev_err(dev, "Self-test xor prep failed\n");
err = -ENODEV;
goto dma_unmap;
}
async_tx_ack(tx);
init_completion(&cmp);
tx->callback = ioat_dma_test_callback;
tx->callback_param = &cmp;
cookie = tx->tx_submit(tx);
if (cookie < 0) {
dev_err(dev, "Self-test xor setup failed\n");
err = -ENODEV;
goto dma_unmap;
}
dma->device_issue_pending(dma_chan);
tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
if (tmo == 0 ||
dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
dev_err(dev, "Self-test xor timed out\n");
err = -ENODEV;
goto dma_unmap;
}
for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
u32 *ptr = page_address(dest);
if (ptr[i] != cmp_word) {
dev_err(dev, "Self-test xor failed compare\n");
err = -ENODEV;
goto free_resources;
}
}
dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
/* skip validate if the capability is not present */
if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
goto free_resources;
op = IOAT_OP_XOR_VAL;
/* validate the sources with the destintation page */
for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
xor_val_srcs[i] = xor_srcs[i];
xor_val_srcs[i] = dest;
xor_val_result = 1;
for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_srcs[i])) {
err = -ENOMEM;
goto dma_unmap;
}
}
tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
&xor_val_result, DMA_PREP_INTERRUPT);
if (!tx) {
dev_err(dev, "Self-test zero prep failed\n");
err = -ENODEV;
goto dma_unmap;
}
async_tx_ack(tx);
init_completion(&cmp);
tx->callback = ioat_dma_test_callback;
tx->callback_param = &cmp;
cookie = tx->tx_submit(tx);
if (cookie < 0) {
dev_err(dev, "Self-test zero setup failed\n");
err = -ENODEV;
goto dma_unmap;
}
dma->device_issue_pending(dma_chan);
tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
if (tmo == 0 ||
dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
dev_err(dev, "Self-test validate timed out\n");
err = -ENODEV;
goto dma_unmap;
}
for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
if (xor_val_result != 0) {
dev_err(dev, "Self-test validate failed compare\n");
err = -ENODEV;
goto free_resources;
}
memset(page_address(dest), 0, PAGE_SIZE);
/* test for non-zero parity sum */
op = IOAT_OP_XOR_VAL;
xor_val_result = 0;
for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_srcs[i])) {
err = -ENOMEM;
goto dma_unmap;
}
}
tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
&xor_val_result, DMA_PREP_INTERRUPT);
if (!tx) {
dev_err(dev, "Self-test 2nd zero prep failed\n");
err = -ENODEV;
goto dma_unmap;
}
async_tx_ack(tx);
init_completion(&cmp);
tx->callback = ioat_dma_test_callback;
tx->callback_param = &cmp;
cookie = tx->tx_submit(tx);
if (cookie < 0) {
dev_err(dev, "Self-test 2nd zero setup failed\n");
err = -ENODEV;
goto dma_unmap;
}
dma->device_issue_pending(dma_chan);
tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
if (tmo == 0 ||
dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
dev_err(dev, "Self-test 2nd validate timed out\n");
err = -ENODEV;
goto dma_unmap;
}
if (xor_val_result != SUM_CHECK_P_RESULT) {
dev_err(dev, "Self-test validate failed compare\n");
err = -ENODEV;
goto dma_unmap;
}
for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
goto free_resources;
dma_unmap:
if (op == IOAT_OP_XOR) {
while (--i >= 0)
dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
DMA_TO_DEVICE);
dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
} else if (op == IOAT_OP_XOR_VAL) {
while (--i >= 0)
dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
DMA_TO_DEVICE);
}
free_resources:
dma->device_free_chan_resources(dma_chan);
out:
src_idx = IOAT_NUM_SRC_TEST;
while (src_idx--)
__free_page(xor_srcs[src_idx]);
__free_page(dest);
return err;
}
static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma)
{
int rc;
rc = ioat_dma_self_test(ioat_dma);
if (rc)
return rc;
rc = ioat_xor_val_self_test(ioat_dma);
return rc;
}
static void ioat_intr_quirk(struct ioatdma_device *ioat_dma)
{
struct dma_device *dma;
struct dma_chan *c;
struct ioatdma_chan *ioat_chan;
u32 errmask;
dma = &ioat_dma->dma_dev;
/*
* if we have descriptor write back error status, we mask the
* error interrupts
*/
if (ioat_dma->cap & IOAT_CAP_DWBES) {
list_for_each_entry(c, &dma->channels, device_node) {
ioat_chan = to_ioat_chan(c);
errmask = readl(ioat_chan->reg_base +
IOAT_CHANERR_MASK_OFFSET);
errmask |= IOAT_CHANERR_XOR_P_OR_CRC_ERR |
IOAT_CHANERR_XOR_Q_ERR;
writel(errmask, ioat_chan->reg_base +
IOAT_CHANERR_MASK_OFFSET);
}
}
}
static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
{
struct pci_dev *pdev = ioat_dma->pdev;
int dca_en = system_has_dca_enabled(pdev);
struct dma_device *dma;
struct dma_chan *c;
struct ioatdma_chan *ioat_chan;
int err;
u16 val16;
dma = &ioat_dma->dma_dev;
dma->device_prep_dma_memcpy = ioat_dma_prep_memcpy_lock;
dma->device_issue_pending = ioat_issue_pending;
dma->device_alloc_chan_resources = ioat_alloc_chan_resources;
dma->device_free_chan_resources = ioat_free_chan_resources;
dma_cap_set(DMA_INTERRUPT, dma->cap_mask);
dma->device_prep_dma_interrupt = ioat_prep_interrupt_lock;
ioat_dma->cap = readl(ioat_dma->reg_base + IOAT_DMA_CAP_OFFSET);
if (is_xeon_cb32(pdev) || is_bwd_noraid(pdev))
ioat_dma->cap &=
~(IOAT_CAP_XOR | IOAT_CAP_PQ | IOAT_CAP_RAID16SS);
/* dca is incompatible with raid operations */
if (dca_en && (ioat_dma->cap & (IOAT_CAP_XOR|IOAT_CAP_PQ)))
ioat_dma->cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ);
if (ioat_dma->cap & IOAT_CAP_XOR) {
dma->max_xor = 8;
dma_cap_set(DMA_XOR, dma->cap_mask);
dma->device_prep_dma_xor = ioat_prep_xor;
dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
dma->device_prep_dma_xor_val = ioat_prep_xor_val;
}
if (ioat_dma->cap & IOAT_CAP_PQ) {
dma->device_prep_dma_pq = ioat_prep_pq;
dma->device_prep_dma_pq_val = ioat_prep_pq_val;
dma_cap_set(DMA_PQ, dma->cap_mask);
dma_cap_set(DMA_PQ_VAL, dma->cap_mask);
if (ioat_dma->cap & IOAT_CAP_RAID16SS)
dma_set_maxpq(dma, 16, 0);
else
dma_set_maxpq(dma, 8, 0);
if (!(ioat_dma->cap & IOAT_CAP_XOR)) {
dma->device_prep_dma_xor = ioat_prep_pqxor;
dma->device_prep_dma_xor_val = ioat_prep_pqxor_val;
dma_cap_set(DMA_XOR, dma->cap_mask);
dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
if (ioat_dma->cap & IOAT_CAP_RAID16SS)
dma->max_xor = 16;
else
dma->max_xor = 8;
}
}
dma->device_tx_status = ioat_tx_status;
/* starting with CB3.3 super extended descriptors are supported */
if (ioat_dma->cap & IOAT_CAP_RAID16SS) {
char pool_name[14];
int i;
for (i = 0; i < MAX_SED_POOLS; i++) {
snprintf(pool_name, 14, "ioat_hw%d_sed", i);
/* allocate SED DMA pool */
ioat_dma->sed_hw_pool[i] = dmam_pool_create(pool_name,
&pdev->dev,
SED_SIZE * (i + 1), 64, 0);
if (!ioat_dma->sed_hw_pool[i])
return -ENOMEM;
}
}
if (!(ioat_dma->cap & (IOAT_CAP_XOR | IOAT_CAP_PQ)))
dma_cap_set(DMA_PRIVATE, dma->cap_mask);
err = ioat_probe(ioat_dma);
if (err)
return err;
list_for_each_entry(c, &dma->channels, device_node) {
ioat_chan = to_ioat_chan(c);
writel(IOAT_DMA_DCA_ANY_CPU,
ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
}
err = ioat_register(ioat_dma);
if (err)
return err;
ioat_kobject_add(ioat_dma, &ioat_ktype);
if (dca)
ioat_dma->dca = ioat_dca_init(pdev, ioat_dma->reg_base);
/* disable relaxed ordering */
err = pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &val16);
if (err)
return pcibios_err_to_errno(err);
/* clear relaxed ordering enable */
val16 &= ~PCI_EXP_DEVCTL_RELAX_EN;
err = pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, val16);
if (err)
return pcibios_err_to_errno(err);
if (ioat_dma->cap & IOAT_CAP_DPS)
writeb(ioat_pending_level + 1,
ioat_dma->reg_base + IOAT_PREFETCH_LIMIT_OFFSET);
return 0;
}
static void ioat_shutdown(struct pci_dev *pdev)
{
struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
struct ioatdma_chan *ioat_chan;
int i;
if (!ioat_dma)
return;
for (i = 0; i < IOAT_MAX_CHANS; i++) {
ioat_chan = ioat_dma->idx[i];
if (!ioat_chan)
continue;
spin_lock_bh(&ioat_chan->prep_lock);
set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
spin_unlock_bh(&ioat_chan->prep_lock);
/*
* Synchronization rule for del_timer_sync():
* - The caller must not hold locks which would prevent
* completion of the timer's handler.
* So prep_lock cannot be held before calling it.
*/
del_timer_sync(&ioat_chan->timer);
/* this should quiesce then reset */
ioat_reset_hw(ioat_chan);
}
ioat_disable_interrupts(ioat_dma);
}
static void ioat_resume(struct ioatdma_device *ioat_dma)
{
struct ioatdma_chan *ioat_chan;
u32 chanerr;
int i;
for (i = 0; i < IOAT_MAX_CHANS; i++) {
ioat_chan = ioat_dma->idx[i];
if (!ioat_chan)
continue;
spin_lock_bh(&ioat_chan->prep_lock);
clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
spin_unlock_bh(&ioat_chan->prep_lock);
chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
/* no need to reset as shutdown already did that */
}
}
#define DRV_NAME "ioatdma"
static pci_ers_result_t ioat_pcie_error_detected(struct pci_dev *pdev,
pci_channel_state_t error)
{
dev_dbg(&pdev->dev, "%s: PCIe AER error %d\n", DRV_NAME, error);
/* quiesce and block I/O */
ioat_shutdown(pdev);
return PCI_ERS_RESULT_NEED_RESET;
}
static pci_ers_result_t ioat_pcie_error_slot_reset(struct pci_dev *pdev)
{
pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED;
dev_dbg(&pdev->dev, "%s post reset handling\n", DRV_NAME);
if (pci_enable_device_mem(pdev) < 0) {
dev_err(&pdev->dev,
"Failed to enable PCIe device after reset.\n");
result = PCI_ERS_RESULT_DISCONNECT;
} else {
pci_set_master(pdev);
pci_restore_state(pdev);
pci_save_state(pdev);
pci_wake_from_d3(pdev, false);
}
return result;
}
static void ioat_pcie_error_resume(struct pci_dev *pdev)
{
struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s: AER handling resuming\n", DRV_NAME);
/* initialize and bring everything back */
ioat_resume(ioat_dma);
}
static const struct pci_error_handlers ioat_err_handler = {
.error_detected = ioat_pcie_error_detected,
.slot_reset = ioat_pcie_error_slot_reset,
.resume = ioat_pcie_error_resume,
};
static struct pci_driver ioat_pci_driver = {
.name = DRV_NAME,
.id_table = ioat_pci_tbl,
.probe = ioat_pci_probe,
.remove = ioat_remove,
.shutdown = ioat_shutdown,
.err_handler = &ioat_err_handler,
};
static void release_ioatdma(struct dma_device *device)
{
struct ioatdma_device *d = to_ioatdma_device(device);
int i;
for (i = 0; i < IOAT_MAX_CHANS; i++)
kfree(d->idx[i]);
dma_pool_destroy(d->completion_pool);
kfree(d);
}
static struct ioatdma_device *
alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
{
struct ioatdma_device *d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d)
return NULL;
d->pdev = pdev;
d->reg_base = iobase;
d->dma_dev.device_release = release_ioatdma;
return d;
}
static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
void __iomem * const *iomap;
struct device *dev = &pdev->dev;
struct ioatdma_device *device;
int err;
err = pcim_enable_device(pdev);
if (err)
return err;
err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
if (err)
return err;
iomap = pcim_iomap_table(pdev);
if (!iomap)
return -ENOMEM;
err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (err)
return err;
device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
if (!device)
return -ENOMEM;
pci_set_master(pdev);
pci_set_drvdata(pdev, device);
device->version = readb(device->reg_base + IOAT_VER_OFFSET);
if (device->version >= IOAT_VER_3_4)
ioat_dca_enabled = 0;
if (device->version >= IOAT_VER_3_0) {
if (is_skx_ioat(pdev))
device->version = IOAT_VER_3_2;
err = ioat3_dma_probe(device, ioat_dca_enabled);
} else
return -ENODEV;
if (err) {
dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
return -ENODEV;
}
return 0;
}
static void ioat_remove(struct pci_dev *pdev)
{
struct ioatdma_device *device = pci_get_drvdata(pdev);
if (!device)
return;
ioat_shutdown(pdev);
dev_err(&pdev->dev, "Removing dma and dca services\n");
if (device->dca) {
unregister_dca_provider(device->dca, &pdev->dev);
free_dca_provider(device->dca);
device->dca = NULL;
}
ioat_dma_remove(device);
}
static int __init ioat_init_module(void)
{
int err = -ENOMEM;
pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
DRV_NAME, IOAT_DMA_VERSION);
ioat_cache = kmem_cache_create("ioat", sizeof(struct ioat_ring_ent),
0, SLAB_HWCACHE_ALIGN, NULL);
if (!ioat_cache)
return -ENOMEM;
ioat_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
if (!ioat_sed_cache)
goto err_ioat_cache;
err = pci_register_driver(&ioat_pci_driver);
if (err)
goto err_ioat3_cache;
return 0;
err_ioat3_cache:
kmem_cache_destroy(ioat_sed_cache);
err_ioat_cache:
kmem_cache_destroy(ioat_cache);
return err;
}
module_init(ioat_init_module);
static void __exit ioat_exit_module(void)
{
pci_unregister_driver(&ioat_pci_driver);
kmem_cache_destroy(ioat_cache);
}
module_exit(ioat_exit_module);
| linux-master | drivers/dma/ioat/init.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel I/OAT DMA Linux driver
* Copyright(c) 2004 - 2015 Intel Corporation.
*/
/*
* This driver supports an Intel I/OAT DMA engine, which does asynchronous
* copy operations.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/workqueue.h>
#include <linux/prefetch.h>
#include <linux/sizes.h>
#include "dma.h"
#include "registers.h"
#include "hw.h"
#include "../dmaengine.h"
static int completion_timeout = 200;
module_param(completion_timeout, int, 0644);
MODULE_PARM_DESC(completion_timeout,
"set ioat completion timeout [msec] (default 200 [msec])");
static int idle_timeout = 2000;
module_param(idle_timeout, int, 0644);
MODULE_PARM_DESC(idle_timeout,
"set ioat idle timeout [msec] (default 2000 [msec])");
#define IDLE_TIMEOUT msecs_to_jiffies(idle_timeout)
#define COMPLETION_TIMEOUT msecs_to_jiffies(completion_timeout)
static char *chanerr_str[] = {
"DMA Transfer Source Address Error",
"DMA Transfer Destination Address Error",
"Next Descriptor Address Error",
"Descriptor Error",
"Chan Address Value Error",
"CHANCMD Error",
"Chipset Uncorrectable Data Integrity Error",
"DMA Uncorrectable Data Integrity Error",
"Read Data Error",
"Write Data Error",
"Descriptor Control Error",
"Descriptor Transfer Size Error",
"Completion Address Error",
"Interrupt Configuration Error",
"Super extended descriptor Address Error",
"Unaffiliated Error",
"CRC or XOR P Error",
"XOR Q Error",
"Descriptor Count Error",
"DIF All F detect Error",
"Guard Tag verification Error",
"Application Tag verification Error",
"Reference Tag verification Error",
"Bundle Bit Error",
"Result DIF All F detect Error",
"Result Guard Tag verification Error",
"Result Application Tag verification Error",
"Result Reference Tag verification Error",
};
static void ioat_eh(struct ioatdma_chan *ioat_chan);
static void ioat_print_chanerrs(struct ioatdma_chan *ioat_chan, u32 chanerr)
{
int i;
for (i = 0; i < ARRAY_SIZE(chanerr_str); i++) {
if ((chanerr >> i) & 1) {
dev_err(to_dev(ioat_chan), "Err(%d): %s\n",
i, chanerr_str[i]);
}
}
}
/**
* ioat_dma_do_interrupt - handler used for single vector interrupt mode
* @irq: interrupt id
* @data: interrupt data
*/
irqreturn_t ioat_dma_do_interrupt(int irq, void *data)
{
struct ioatdma_device *instance = data;
struct ioatdma_chan *ioat_chan;
unsigned long attnstatus;
int bit;
u8 intrctrl;
intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET);
if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN))
return IRQ_NONE;
if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) {
writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET);
return IRQ_NONE;
}
attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET);
for_each_set_bit(bit, &attnstatus, BITS_PER_LONG) {
ioat_chan = ioat_chan_by_index(instance, bit);
if (test_bit(IOAT_RUN, &ioat_chan->state))
tasklet_schedule(&ioat_chan->cleanup_task);
}
writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET);
return IRQ_HANDLED;
}
/**
* ioat_dma_do_interrupt_msix - handler used for vector-per-channel interrupt mode
* @irq: interrupt id
* @data: interrupt data
*/
irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data)
{
struct ioatdma_chan *ioat_chan = data;
if (test_bit(IOAT_RUN, &ioat_chan->state))
tasklet_schedule(&ioat_chan->cleanup_task);
return IRQ_HANDLED;
}
void ioat_stop(struct ioatdma_chan *ioat_chan)
{
struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
struct pci_dev *pdev = ioat_dma->pdev;
int chan_id = chan_num(ioat_chan);
struct msix_entry *msix;
/* 1/ stop irq from firing tasklets
* 2/ stop the tasklet from re-arming irqs
*/
clear_bit(IOAT_RUN, &ioat_chan->state);
/* flush inflight interrupts */
switch (ioat_dma->irq_mode) {
case IOAT_MSIX:
msix = &ioat_dma->msix_entries[chan_id];
synchronize_irq(msix->vector);
break;
case IOAT_MSI:
case IOAT_INTX:
synchronize_irq(pdev->irq);
break;
default:
break;
}
/* flush inflight timers */
del_timer_sync(&ioat_chan->timer);
/* flush inflight tasklet runs */
tasklet_kill(&ioat_chan->cleanup_task);
/* final cleanup now that everything is quiesced and can't re-arm */
ioat_cleanup_event(&ioat_chan->cleanup_task);
}
static void __ioat_issue_pending(struct ioatdma_chan *ioat_chan)
{
ioat_chan->dmacount += ioat_ring_pending(ioat_chan);
ioat_chan->issued = ioat_chan->head;
writew(ioat_chan->dmacount,
ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET);
dev_dbg(to_dev(ioat_chan),
"%s: head: %#x tail: %#x issued: %#x count: %#x\n",
__func__, ioat_chan->head, ioat_chan->tail,
ioat_chan->issued, ioat_chan->dmacount);
}
void ioat_issue_pending(struct dma_chan *c)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
if (ioat_ring_pending(ioat_chan)) {
spin_lock_bh(&ioat_chan->prep_lock);
__ioat_issue_pending(ioat_chan);
spin_unlock_bh(&ioat_chan->prep_lock);
}
}
/**
* ioat_update_pending - log pending descriptors
* @ioat_chan: ioat+ channel
*
* Check if the number of unsubmitted descriptors has exceeded the
* watermark. Called with prep_lock held
*/
static void ioat_update_pending(struct ioatdma_chan *ioat_chan)
{
if (ioat_ring_pending(ioat_chan) > ioat_pending_level)
__ioat_issue_pending(ioat_chan);
}
static void __ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
{
struct ioat_ring_ent *desc;
struct ioat_dma_descriptor *hw;
if (ioat_ring_space(ioat_chan) < 1) {
dev_err(to_dev(ioat_chan),
"Unable to start null desc - ring full\n");
return;
}
dev_dbg(to_dev(ioat_chan),
"%s: head: %#x tail: %#x issued: %#x\n",
__func__, ioat_chan->head, ioat_chan->tail, ioat_chan->issued);
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head);
hw = desc->hw;
hw->ctl = 0;
hw->ctl_f.null = 1;
hw->ctl_f.int_en = 1;
hw->ctl_f.compl_write = 1;
/* set size to non-zero value (channel returns error when size is 0) */
hw->size = NULL_DESC_BUFFER_SIZE;
hw->src_addr = 0;
hw->dst_addr = 0;
async_tx_ack(&desc->txd);
ioat_set_chainaddr(ioat_chan, desc->txd.phys);
dump_desc_dbg(ioat_chan, desc);
/* make sure descriptors are written before we submit */
wmb();
ioat_chan->head += 1;
__ioat_issue_pending(ioat_chan);
}
void ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
{
spin_lock_bh(&ioat_chan->prep_lock);
if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
__ioat_start_null_desc(ioat_chan);
spin_unlock_bh(&ioat_chan->prep_lock);
}
static void __ioat_restart_chan(struct ioatdma_chan *ioat_chan)
{
/* set the tail to be re-issued */
ioat_chan->issued = ioat_chan->tail;
ioat_chan->dmacount = 0;
mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
dev_dbg(to_dev(ioat_chan),
"%s: head: %#x tail: %#x issued: %#x count: %#x\n",
__func__, ioat_chan->head, ioat_chan->tail,
ioat_chan->issued, ioat_chan->dmacount);
if (ioat_ring_pending(ioat_chan)) {
struct ioat_ring_ent *desc;
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
ioat_set_chainaddr(ioat_chan, desc->txd.phys);
__ioat_issue_pending(ioat_chan);
} else
__ioat_start_null_desc(ioat_chan);
}
static int ioat_quiesce(struct ioatdma_chan *ioat_chan, unsigned long tmo)
{
unsigned long end = jiffies + tmo;
int err = 0;
u32 status;
status = ioat_chansts(ioat_chan);
if (is_ioat_active(status) || is_ioat_idle(status))
ioat_suspend(ioat_chan);
while (is_ioat_active(status) || is_ioat_idle(status)) {
if (tmo && time_after(jiffies, end)) {
err = -ETIMEDOUT;
break;
}
status = ioat_chansts(ioat_chan);
cpu_relax();
}
return err;
}
static int ioat_reset_sync(struct ioatdma_chan *ioat_chan, unsigned long tmo)
{
unsigned long end = jiffies + tmo;
int err = 0;
ioat_reset(ioat_chan);
while (ioat_reset_pending(ioat_chan)) {
if (end && time_after(jiffies, end)) {
err = -ETIMEDOUT;
break;
}
cpu_relax();
}
return err;
}
static dma_cookie_t ioat_tx_submit_unlock(struct dma_async_tx_descriptor *tx)
__releases(&ioat_chan->prep_lock)
{
struct dma_chan *c = tx->chan;
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
dma_cookie_t cookie;
cookie = dma_cookie_assign(tx);
dev_dbg(to_dev(ioat_chan), "%s: cookie: %d\n", __func__, cookie);
if (!test_and_set_bit(IOAT_CHAN_ACTIVE, &ioat_chan->state))
mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
/* make descriptor updates visible before advancing ioat->head,
* this is purposefully not smp_wmb() since we are also
* publishing the descriptor updates to a dma device
*/
wmb();
ioat_chan->head += ioat_chan->produce;
ioat_update_pending(ioat_chan);
spin_unlock_bh(&ioat_chan->prep_lock);
return cookie;
}
static struct ioat_ring_ent *
ioat_alloc_ring_ent(struct dma_chan *chan, int idx, gfp_t flags)
{
struct ioat_dma_descriptor *hw;
struct ioat_ring_ent *desc;
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
int chunk;
dma_addr_t phys;
u8 *pos;
off_t offs;
chunk = idx / IOAT_DESCS_PER_CHUNK;
idx &= (IOAT_DESCS_PER_CHUNK - 1);
offs = idx * IOAT_DESC_SZ;
pos = (u8 *)ioat_chan->descs[chunk].virt + offs;
phys = ioat_chan->descs[chunk].hw + offs;
hw = (struct ioat_dma_descriptor *)pos;
memset(hw, 0, sizeof(*hw));
desc = kmem_cache_zalloc(ioat_cache, flags);
if (!desc)
return NULL;
dma_async_tx_descriptor_init(&desc->txd, chan);
desc->txd.tx_submit = ioat_tx_submit_unlock;
desc->hw = hw;
desc->txd.phys = phys;
return desc;
}
void ioat_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan)
{
kmem_cache_free(ioat_cache, desc);
}
struct ioat_ring_ent **
ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
struct ioat_ring_ent **ring;
int total_descs = 1 << order;
int i, chunks;
/* allocate the array to hold the software ring */
ring = kcalloc(total_descs, sizeof(*ring), flags);
if (!ring)
return NULL;
chunks = (total_descs * IOAT_DESC_SZ) / IOAT_CHUNK_SIZE;
ioat_chan->desc_chunks = chunks;
for (i = 0; i < chunks; i++) {
struct ioat_descs *descs = &ioat_chan->descs[i];
descs->virt = dma_alloc_coherent(to_dev(ioat_chan),
IOAT_CHUNK_SIZE, &descs->hw, flags);
if (!descs->virt) {
int idx;
for (idx = 0; idx < i; idx++) {
descs = &ioat_chan->descs[idx];
dma_free_coherent(to_dev(ioat_chan),
IOAT_CHUNK_SIZE,
descs->virt, descs->hw);
descs->virt = NULL;
descs->hw = 0;
}
ioat_chan->desc_chunks = 0;
kfree(ring);
return NULL;
}
}
for (i = 0; i < total_descs; i++) {
ring[i] = ioat_alloc_ring_ent(c, i, flags);
if (!ring[i]) {
int idx;
while (i--)
ioat_free_ring_ent(ring[i], c);
for (idx = 0; idx < ioat_chan->desc_chunks; idx++) {
dma_free_coherent(to_dev(ioat_chan),
IOAT_CHUNK_SIZE,
ioat_chan->descs[idx].virt,
ioat_chan->descs[idx].hw);
ioat_chan->descs[idx].virt = NULL;
ioat_chan->descs[idx].hw = 0;
}
ioat_chan->desc_chunks = 0;
kfree(ring);
return NULL;
}
set_desc_id(ring[i], i);
}
/* link descs */
for (i = 0; i < total_descs-1; i++) {
struct ioat_ring_ent *next = ring[i+1];
struct ioat_dma_descriptor *hw = ring[i]->hw;
hw->next = next->txd.phys;
}
ring[i]->hw->next = ring[0]->txd.phys;
/* setup descriptor pre-fetching for v3.4 */
if (ioat_dma->cap & IOAT_CAP_DPS) {
u16 drsctl = IOAT_CHAN_DRSZ_2MB | IOAT_CHAN_DRS_EN;
if (chunks == 1)
drsctl |= IOAT_CHAN_DRS_AUTOWRAP;
writew(drsctl, ioat_chan->reg_base + IOAT_CHAN_DRSCTL_OFFSET);
}
return ring;
}
/**
* ioat_check_space_lock - verify space and grab ring producer lock
* @ioat_chan: ioat,3 channel (ring) to operate on
* @num_descs: allocation length
*/
int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs)
__acquires(&ioat_chan->prep_lock)
{
spin_lock_bh(&ioat_chan->prep_lock);
/* never allow the last descriptor to be consumed, we need at
* least one free at all times to allow for on-the-fly ring
* resizing.
*/
if (likely(ioat_ring_space(ioat_chan) > num_descs)) {
dev_dbg(to_dev(ioat_chan), "%s: num_descs: %d (%x:%x:%x)\n",
__func__, num_descs, ioat_chan->head,
ioat_chan->tail, ioat_chan->issued);
ioat_chan->produce = num_descs;
return 0; /* with ioat->prep_lock held */
}
spin_unlock_bh(&ioat_chan->prep_lock);
dev_dbg_ratelimited(to_dev(ioat_chan),
"%s: ring full! num_descs: %d (%x:%x:%x)\n",
__func__, num_descs, ioat_chan->head,
ioat_chan->tail, ioat_chan->issued);
/* progress reclaim in the allocation failure case we may be
* called under bh_disabled so we need to trigger the timer
* event directly
*/
if (time_is_before_jiffies(ioat_chan->timer.expires)
&& timer_pending(&ioat_chan->timer)) {
mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
ioat_timer_event(&ioat_chan->timer);
}
return -ENOMEM;
}
static bool desc_has_ext(struct ioat_ring_ent *desc)
{
struct ioat_dma_descriptor *hw = desc->hw;
if (hw->ctl_f.op == IOAT_OP_XOR ||
hw->ctl_f.op == IOAT_OP_XOR_VAL) {
struct ioat_xor_descriptor *xor = desc->xor;
if (src_cnt_to_sw(xor->ctl_f.src_cnt) > 5)
return true;
} else if (hw->ctl_f.op == IOAT_OP_PQ ||
hw->ctl_f.op == IOAT_OP_PQ_VAL) {
struct ioat_pq_descriptor *pq = desc->pq;
if (src_cnt_to_sw(pq->ctl_f.src_cnt) > 3)
return true;
}
return false;
}
static void
ioat_free_sed(struct ioatdma_device *ioat_dma, struct ioat_sed_ent *sed)
{
if (!sed)
return;
dma_pool_free(ioat_dma->sed_hw_pool[sed->hw_pool], sed->hw, sed->dma);
kmem_cache_free(ioat_sed_cache, sed);
}
static u64 ioat_get_current_completion(struct ioatdma_chan *ioat_chan)
{
u64 phys_complete;
u64 completion;
completion = *ioat_chan->completion;
phys_complete = ioat_chansts_to_addr(completion);
dev_dbg(to_dev(ioat_chan), "%s: phys_complete: %#llx\n", __func__,
(unsigned long long) phys_complete);
return phys_complete;
}
static bool ioat_cleanup_preamble(struct ioatdma_chan *ioat_chan,
u64 *phys_complete)
{
*phys_complete = ioat_get_current_completion(ioat_chan);
if (*phys_complete == ioat_chan->last_completion)
return false;
clear_bit(IOAT_COMPLETION_ACK, &ioat_chan->state);
mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
return true;
}
static void
desc_get_errstat(struct ioatdma_chan *ioat_chan, struct ioat_ring_ent *desc)
{
struct ioat_dma_descriptor *hw = desc->hw;
switch (hw->ctl_f.op) {
case IOAT_OP_PQ_VAL:
case IOAT_OP_PQ_VAL_16S:
{
struct ioat_pq_descriptor *pq = desc->pq;
/* check if there's error written */
if (!pq->dwbes_f.wbes)
return;
/* need to set a chanerr var for checking to clear later */
if (pq->dwbes_f.p_val_err)
*desc->result |= SUM_CHECK_P_RESULT;
if (pq->dwbes_f.q_val_err)
*desc->result |= SUM_CHECK_Q_RESULT;
return;
}
default:
return;
}
}
/**
* __ioat_cleanup - reclaim used descriptors
* @ioat_chan: channel (ring) to clean
* @phys_complete: zeroed (or not) completion address (from status)
*/
static void __ioat_cleanup(struct ioatdma_chan *ioat_chan, dma_addr_t phys_complete)
{
struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
struct ioat_ring_ent *desc;
bool seen_current = false;
int idx = ioat_chan->tail, i;
u16 active;
dev_dbg(to_dev(ioat_chan), "%s: head: %#x tail: %#x issued: %#x\n",
__func__, ioat_chan->head, ioat_chan->tail, ioat_chan->issued);
/*
* At restart of the channel, the completion address and the
* channel status will be 0 due to starting a new chain. Since
* it's new chain and the first descriptor "fails", there is
* nothing to clean up. We do not want to reap the entire submitted
* chain due to this 0 address value and then BUG.
*/
if (!phys_complete)
return;
active = ioat_ring_active(ioat_chan);
for (i = 0; i < active && !seen_current; i++) {
struct dma_async_tx_descriptor *tx;
prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1));
desc = ioat_get_ring_ent(ioat_chan, idx + i);
dump_desc_dbg(ioat_chan, desc);
/* set err stat if we are using dwbes */
if (ioat_dma->cap & IOAT_CAP_DWBES)
desc_get_errstat(ioat_chan, desc);
tx = &desc->txd;
if (tx->cookie) {
dma_cookie_complete(tx);
dma_descriptor_unmap(tx);
dmaengine_desc_get_callback_invoke(tx, NULL);
tx->callback = NULL;
tx->callback_result = NULL;
}
if (tx->phys == phys_complete)
seen_current = true;
/* skip extended descriptors */
if (desc_has_ext(desc)) {
BUG_ON(i + 1 >= active);
i++;
}
/* cleanup super extended descriptors */
if (desc->sed) {
ioat_free_sed(ioat_dma, desc->sed);
desc->sed = NULL;
}
}
/* finish all descriptor reads before incrementing tail */
smp_mb();
ioat_chan->tail = idx + i;
/* no active descs have written a completion? */
BUG_ON(active && !seen_current);
ioat_chan->last_completion = phys_complete;
if (active - i == 0) {
dev_dbg(to_dev(ioat_chan), "%s: cancel completion timeout\n",
__func__);
mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
}
/* microsecond delay by sysfs variable per pending descriptor */
if (ioat_chan->intr_coalesce != ioat_chan->prev_intr_coalesce) {
writew(min((ioat_chan->intr_coalesce * (active - i)),
IOAT_INTRDELAY_MASK),
ioat_chan->ioat_dma->reg_base + IOAT_INTRDELAY_OFFSET);
ioat_chan->prev_intr_coalesce = ioat_chan->intr_coalesce;
}
}
static void ioat_cleanup(struct ioatdma_chan *ioat_chan)
{
u64 phys_complete;
spin_lock_bh(&ioat_chan->cleanup_lock);
if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
__ioat_cleanup(ioat_chan, phys_complete);
if (is_ioat_halted(*ioat_chan->completion)) {
u32 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
if (chanerr &
(IOAT_CHANERR_HANDLE_MASK | IOAT_CHANERR_RECOVER_MASK)) {
mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
ioat_eh(ioat_chan);
}
}
spin_unlock_bh(&ioat_chan->cleanup_lock);
}
void ioat_cleanup_event(struct tasklet_struct *t)
{
struct ioatdma_chan *ioat_chan = from_tasklet(ioat_chan, t, cleanup_task);
ioat_cleanup(ioat_chan);
if (!test_bit(IOAT_RUN, &ioat_chan->state))
return;
writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
}
static void ioat_restart_channel(struct ioatdma_chan *ioat_chan)
{
u64 phys_complete;
/* set the completion address register again */
writel(lower_32_bits(ioat_chan->completion_dma),
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
writel(upper_32_bits(ioat_chan->completion_dma),
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
ioat_quiesce(ioat_chan, 0);
if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
__ioat_cleanup(ioat_chan, phys_complete);
__ioat_restart_chan(ioat_chan);
}
static void ioat_abort_descs(struct ioatdma_chan *ioat_chan)
{
struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
struct ioat_ring_ent *desc;
u16 active;
int idx = ioat_chan->tail, i;
/*
* We assume that the failed descriptor has been processed.
* Now we are just returning all the remaining submitted
* descriptors to abort.
*/
active = ioat_ring_active(ioat_chan);
/* we skip the failed descriptor that tail points to */
for (i = 1; i < active; i++) {
struct dma_async_tx_descriptor *tx;
prefetch(ioat_get_ring_ent(ioat_chan, idx + i + 1));
desc = ioat_get_ring_ent(ioat_chan, idx + i);
tx = &desc->txd;
if (tx->cookie) {
struct dmaengine_result res;
dma_cookie_complete(tx);
dma_descriptor_unmap(tx);
res.result = DMA_TRANS_ABORTED;
dmaengine_desc_get_callback_invoke(tx, &res);
tx->callback = NULL;
tx->callback_result = NULL;
}
/* skip extended descriptors */
if (desc_has_ext(desc)) {
WARN_ON(i + 1 >= active);
i++;
}
/* cleanup super extended descriptors */
if (desc->sed) {
ioat_free_sed(ioat_dma, desc->sed);
desc->sed = NULL;
}
}
smp_mb(); /* finish all descriptor reads before incrementing tail */
ioat_chan->tail = idx + active;
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
ioat_chan->last_completion = *ioat_chan->completion = desc->txd.phys;
}
static void ioat_eh(struct ioatdma_chan *ioat_chan)
{
struct pci_dev *pdev = to_pdev(ioat_chan);
struct ioat_dma_descriptor *hw;
struct dma_async_tx_descriptor *tx;
u64 phys_complete;
struct ioat_ring_ent *desc;
u32 err_handled = 0;
u32 chanerr_int;
u32 chanerr;
bool abort = false;
struct dmaengine_result res;
/* cleanup so tail points to descriptor that caused the error */
if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
__ioat_cleanup(ioat_chan, phys_complete);
chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
pci_read_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, &chanerr_int);
dev_dbg(to_dev(ioat_chan), "%s: error = %x:%x\n",
__func__, chanerr, chanerr_int);
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail);
hw = desc->hw;
dump_desc_dbg(ioat_chan, desc);
switch (hw->ctl_f.op) {
case IOAT_OP_XOR_VAL:
if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) {
*desc->result |= SUM_CHECK_P_RESULT;
err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR;
}
break;
case IOAT_OP_PQ_VAL:
case IOAT_OP_PQ_VAL_16S:
if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) {
*desc->result |= SUM_CHECK_P_RESULT;
err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR;
}
if (chanerr & IOAT_CHANERR_XOR_Q_ERR) {
*desc->result |= SUM_CHECK_Q_RESULT;
err_handled |= IOAT_CHANERR_XOR_Q_ERR;
}
break;
}
if (chanerr & IOAT_CHANERR_RECOVER_MASK) {
if (chanerr & IOAT_CHANERR_READ_DATA_ERR) {
res.result = DMA_TRANS_READ_FAILED;
err_handled |= IOAT_CHANERR_READ_DATA_ERR;
} else if (chanerr & IOAT_CHANERR_WRITE_DATA_ERR) {
res.result = DMA_TRANS_WRITE_FAILED;
err_handled |= IOAT_CHANERR_WRITE_DATA_ERR;
}
abort = true;
} else
res.result = DMA_TRANS_NOERROR;
/* fault on unhandled error or spurious halt */
if (chanerr ^ err_handled || chanerr == 0) {
dev_err(to_dev(ioat_chan), "%s: fatal error (%x:%x)\n",
__func__, chanerr, err_handled);
dev_err(to_dev(ioat_chan), "Errors handled:\n");
ioat_print_chanerrs(ioat_chan, err_handled);
dev_err(to_dev(ioat_chan), "Errors not handled:\n");
ioat_print_chanerrs(ioat_chan, (chanerr & ~err_handled));
BUG();
}
/* cleanup the faulty descriptor since we are continuing */
tx = &desc->txd;
if (tx->cookie) {
dma_cookie_complete(tx);
dma_descriptor_unmap(tx);
dmaengine_desc_get_callback_invoke(tx, &res);
tx->callback = NULL;
tx->callback_result = NULL;
}
/* mark faulting descriptor as complete */
*ioat_chan->completion = desc->txd.phys;
spin_lock_bh(&ioat_chan->prep_lock);
/* we need abort all descriptors */
if (abort) {
ioat_abort_descs(ioat_chan);
/* clean up the channel, we could be in weird state */
ioat_reset_hw(ioat_chan);
}
writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
pci_write_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, chanerr_int);
ioat_restart_channel(ioat_chan);
spin_unlock_bh(&ioat_chan->prep_lock);
}
static void check_active(struct ioatdma_chan *ioat_chan)
{
if (ioat_ring_active(ioat_chan)) {
mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
return;
}
if (test_and_clear_bit(IOAT_CHAN_ACTIVE, &ioat_chan->state))
mod_timer_pending(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
}
static void ioat_reboot_chan(struct ioatdma_chan *ioat_chan)
{
spin_lock_bh(&ioat_chan->prep_lock);
set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
spin_unlock_bh(&ioat_chan->prep_lock);
ioat_abort_descs(ioat_chan);
dev_warn(to_dev(ioat_chan), "Reset channel...\n");
ioat_reset_hw(ioat_chan);
dev_warn(to_dev(ioat_chan), "Restart channel...\n");
ioat_restart_channel(ioat_chan);
spin_lock_bh(&ioat_chan->prep_lock);
clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
spin_unlock_bh(&ioat_chan->prep_lock);
}
void ioat_timer_event(struct timer_list *t)
{
struct ioatdma_chan *ioat_chan = from_timer(ioat_chan, t, timer);
dma_addr_t phys_complete;
u64 status;
status = ioat_chansts(ioat_chan);
/* when halted due to errors check for channel
* programming errors before advancing the completion state
*/
if (is_ioat_halted(status)) {
u32 chanerr;
chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
dev_err(to_dev(ioat_chan), "%s: Channel halted (%x)\n",
__func__, chanerr);
dev_err(to_dev(ioat_chan), "Errors:\n");
ioat_print_chanerrs(ioat_chan, chanerr);
if (test_bit(IOAT_RUN, &ioat_chan->state)) {
spin_lock_bh(&ioat_chan->cleanup_lock);
ioat_reboot_chan(ioat_chan);
spin_unlock_bh(&ioat_chan->cleanup_lock);
}
return;
}
spin_lock_bh(&ioat_chan->cleanup_lock);
/* handle the no-actives case */
if (!ioat_ring_active(ioat_chan)) {
spin_lock_bh(&ioat_chan->prep_lock);
check_active(ioat_chan);
spin_unlock_bh(&ioat_chan->prep_lock);
goto unlock_out;
}
/* handle the missed cleanup case */
if (ioat_cleanup_preamble(ioat_chan, &phys_complete)) {
/* timer restarted in ioat_cleanup_preamble
* and IOAT_COMPLETION_ACK cleared
*/
__ioat_cleanup(ioat_chan, phys_complete);
goto unlock_out;
}
/* if we haven't made progress and we have already
* acknowledged a pending completion once, then be more
* forceful with a restart
*/
if (test_bit(IOAT_COMPLETION_ACK, &ioat_chan->state)) {
u32 chanerr;
chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
dev_err(to_dev(ioat_chan), "CHANSTS: %#Lx CHANERR: %#x\n",
status, chanerr);
dev_err(to_dev(ioat_chan), "Errors:\n");
ioat_print_chanerrs(ioat_chan, chanerr);
dev_dbg(to_dev(ioat_chan), "Active descriptors: %d\n",
ioat_ring_active(ioat_chan));
ioat_reboot_chan(ioat_chan);
goto unlock_out;
}
/* handle missed issue pending case */
if (ioat_ring_pending(ioat_chan)) {
dev_warn(to_dev(ioat_chan),
"Completion timeout with pending descriptors\n");
spin_lock_bh(&ioat_chan->prep_lock);
__ioat_issue_pending(ioat_chan);
spin_unlock_bh(&ioat_chan->prep_lock);
}
set_bit(IOAT_COMPLETION_ACK, &ioat_chan->state);
mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
unlock_out:
spin_unlock_bh(&ioat_chan->cleanup_lock);
}
enum dma_status
ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
enum dma_status ret;
ret = dma_cookie_status(c, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
ioat_cleanup(ioat_chan);
return dma_cookie_status(c, cookie, txstate);
}
int ioat_reset_hw(struct ioatdma_chan *ioat_chan)
{
/* throw away whatever the channel was doing and get it
* initialized, with ioat3 specific workarounds
*/
struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
struct pci_dev *pdev = ioat_dma->pdev;
u32 chanerr;
u16 dev_id;
int err;
ioat_quiesce(ioat_chan, msecs_to_jiffies(100));
chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
if (ioat_dma->version < IOAT_VER_3_3) {
/* clear any pending errors */
err = pci_read_config_dword(pdev,
IOAT_PCI_CHANERR_INT_OFFSET, &chanerr);
if (err) {
dev_err(&pdev->dev,
"channel error register unreachable\n");
return err;
}
pci_write_config_dword(pdev,
IOAT_PCI_CHANERR_INT_OFFSET, chanerr);
/* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit
* (workaround for spurious config parity error after restart)
*/
pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id);
if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) {
pci_write_config_dword(pdev,
IOAT_PCI_DMAUNCERRSTS_OFFSET,
0x10);
}
}
if (is_bwd_ioat(pdev) && (ioat_dma->irq_mode == IOAT_MSIX)) {
ioat_dma->msixtba0 = readq(ioat_dma->reg_base + 0x1000);
ioat_dma->msixdata0 = readq(ioat_dma->reg_base + 0x1008);
ioat_dma->msixpba = readq(ioat_dma->reg_base + 0x1800);
}
err = ioat_reset_sync(ioat_chan, msecs_to_jiffies(200));
if (!err) {
if (is_bwd_ioat(pdev) && (ioat_dma->irq_mode == IOAT_MSIX)) {
writeq(ioat_dma->msixtba0, ioat_dma->reg_base + 0x1000);
writeq(ioat_dma->msixdata0, ioat_dma->reg_base + 0x1008);
writeq(ioat_dma->msixpba, ioat_dma->reg_base + 0x1800);
}
}
if (err)
dev_err(&pdev->dev, "Failed to reset: %d\n", err);
return err;
}
| linux-master | drivers/dma/ioat/dma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel I/OAT DMA Linux driver
* Copyright(c) 2007 - 2009 Intel Corporation.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/dca.h>
/* either a kernel change is needed, or we need something like this in kernel */
#ifndef CONFIG_SMP
#include <asm/smp.h>
#undef cpu_physical_id
#define cpu_physical_id(cpu) (cpuid_ebx(1) >> 24)
#endif
#include "dma.h"
#include "registers.h"
/*
* Bit 7 of a tag map entry is the "valid" bit, if it is set then bits 0:6
* contain the bit number of the APIC ID to map into the DCA tag. If the valid
* bit is not set, then the value must be 0 or 1 and defines the bit in the tag.
*/
#define DCA_TAG_MAP_VALID 0x80
#define DCA3_TAG_MAP_BIT_TO_INV 0x80
#define DCA3_TAG_MAP_BIT_TO_SEL 0x40
#define DCA3_TAG_MAP_LITERAL_VAL 0x1
#define DCA_TAG_MAP_MASK 0xDF
/* expected tag map bytes for I/OAT ver.2 */
#define DCA2_TAG_MAP_BYTE0 0x80
#define DCA2_TAG_MAP_BYTE1 0x0
#define DCA2_TAG_MAP_BYTE2 0x81
#define DCA2_TAG_MAP_BYTE3 0x82
#define DCA2_TAG_MAP_BYTE4 0x82
/*
* "Legacy" DCA systems do not implement the DCA register set in the
* I/OAT device. Software needs direct support for their tag mappings.
*/
#define APICID_BIT(x) (DCA_TAG_MAP_VALID | (x))
#define IOAT_TAG_MAP_LEN 8
/* pack PCI B/D/F into a u16 */
static inline u16 dcaid_from_pcidev(struct pci_dev *pci)
{
return pci_dev_id(pci);
}
static int dca_enabled_in_bios(struct pci_dev *pdev)
{
/* CPUID level 9 returns DCA configuration */
/* Bit 0 indicates DCA enabled by the BIOS */
unsigned long cpuid_level_9;
int res;
cpuid_level_9 = cpuid_eax(9);
res = test_bit(0, &cpuid_level_9);
if (!res)
dev_dbg(&pdev->dev, "DCA is disabled in BIOS\n");
return res;
}
int system_has_dca_enabled(struct pci_dev *pdev)
{
if (boot_cpu_has(X86_FEATURE_DCA))
return dca_enabled_in_bios(pdev);
dev_dbg(&pdev->dev, "boot cpu doesn't have X86_FEATURE_DCA\n");
return 0;
}
struct ioat_dca_slot {
struct pci_dev *pdev; /* requester device */
u16 rid; /* requester id, as used by IOAT */
};
#define IOAT_DCA_MAX_REQ 6
#define IOAT3_DCA_MAX_REQ 2
struct ioat_dca_priv {
void __iomem *iobase;
void __iomem *dca_base;
int max_requesters;
int requester_count;
u8 tag_map[IOAT_TAG_MAP_LEN];
struct ioat_dca_slot req_slots[];
};
static int ioat_dca_dev_managed(struct dca_provider *dca,
struct device *dev)
{
struct ioat_dca_priv *ioatdca = dca_priv(dca);
struct pci_dev *pdev;
int i;
pdev = to_pci_dev(dev);
for (i = 0; i < ioatdca->max_requesters; i++) {
if (ioatdca->req_slots[i].pdev == pdev)
return 1;
}
return 0;
}
static int ioat_dca_add_requester(struct dca_provider *dca, struct device *dev)
{
struct ioat_dca_priv *ioatdca = dca_priv(dca);
struct pci_dev *pdev;
int i;
u16 id;
u16 global_req_table;
/* This implementation only supports PCI-Express */
if (!dev_is_pci(dev))
return -ENODEV;
pdev = to_pci_dev(dev);
id = dcaid_from_pcidev(pdev);
if (ioatdca->requester_count == ioatdca->max_requesters)
return -ENODEV;
for (i = 0; i < ioatdca->max_requesters; i++) {
if (ioatdca->req_slots[i].pdev == NULL) {
/* found an empty slot */
ioatdca->requester_count++;
ioatdca->req_slots[i].pdev = pdev;
ioatdca->req_slots[i].rid = id;
global_req_table =
readw(ioatdca->dca_base + IOAT3_DCA_GREQID_OFFSET);
writel(id | IOAT_DCA_GREQID_VALID,
ioatdca->iobase + global_req_table + (i * 4));
return i;
}
}
/* Error, ioatdma->requester_count is out of whack */
return -EFAULT;
}
static int ioat_dca_remove_requester(struct dca_provider *dca,
struct device *dev)
{
struct ioat_dca_priv *ioatdca = dca_priv(dca);
struct pci_dev *pdev;
int i;
u16 global_req_table;
/* This implementation only supports PCI-Express */
if (!dev_is_pci(dev))
return -ENODEV;
pdev = to_pci_dev(dev);
for (i = 0; i < ioatdca->max_requesters; i++) {
if (ioatdca->req_slots[i].pdev == pdev) {
global_req_table =
readw(ioatdca->dca_base + IOAT3_DCA_GREQID_OFFSET);
writel(0, ioatdca->iobase + global_req_table + (i * 4));
ioatdca->req_slots[i].pdev = NULL;
ioatdca->req_slots[i].rid = 0;
ioatdca->requester_count--;
return i;
}
}
return -ENODEV;
}
static u8 ioat_dca_get_tag(struct dca_provider *dca,
struct device *dev,
int cpu)
{
u8 tag;
struct ioat_dca_priv *ioatdca = dca_priv(dca);
int i, apic_id, bit, value;
u8 entry;
tag = 0;
apic_id = cpu_physical_id(cpu);
for (i = 0; i < IOAT_TAG_MAP_LEN; i++) {
entry = ioatdca->tag_map[i];
if (entry & DCA3_TAG_MAP_BIT_TO_SEL) {
bit = entry &
~(DCA3_TAG_MAP_BIT_TO_SEL | DCA3_TAG_MAP_BIT_TO_INV);
value = (apic_id & (1 << bit)) ? 1 : 0;
} else if (entry & DCA3_TAG_MAP_BIT_TO_INV) {
bit = entry & ~DCA3_TAG_MAP_BIT_TO_INV;
value = (apic_id & (1 << bit)) ? 0 : 1;
} else {
value = (entry & DCA3_TAG_MAP_LITERAL_VAL) ? 1 : 0;
}
tag |= (value << i);
}
return tag;
}
static const struct dca_ops ioat_dca_ops = {
.add_requester = ioat_dca_add_requester,
.remove_requester = ioat_dca_remove_requester,
.get_tag = ioat_dca_get_tag,
.dev_managed = ioat_dca_dev_managed,
};
static int ioat_dca_count_dca_slots(void *iobase, u16 dca_offset)
{
int slots = 0;
u32 req;
u16 global_req_table;
global_req_table = readw(iobase + dca_offset + IOAT3_DCA_GREQID_OFFSET);
if (global_req_table == 0)
return 0;
do {
req = readl(iobase + global_req_table + (slots * sizeof(u32)));
slots++;
} while ((req & IOAT_DCA_GREQID_LASTID) == 0);
return slots;
}
static inline int dca3_tag_map_invalid(u8 *tag_map)
{
/*
* If the tag map is not programmed by the BIOS the default is:
* 0x80 0x80 0x80 0x80 0x80 0x00 0x00 0x00
*
* This an invalid map and will result in only 2 possible tags
* 0x1F and 0x00. 0x00 is an invalid DCA tag so we know that
* this entire definition is invalid.
*/
return ((tag_map[0] == DCA_TAG_MAP_VALID) &&
(tag_map[1] == DCA_TAG_MAP_VALID) &&
(tag_map[2] == DCA_TAG_MAP_VALID) &&
(tag_map[3] == DCA_TAG_MAP_VALID) &&
(tag_map[4] == DCA_TAG_MAP_VALID));
}
struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase)
{
struct dca_provider *dca;
struct ioat_dca_priv *ioatdca;
int slots;
int i;
int err;
u16 dca_offset;
u16 csi_fsb_control;
u16 pcie_control;
u8 bit;
union {
u64 full;
struct {
u32 low;
u32 high;
};
} tag_map;
if (!system_has_dca_enabled(pdev))
return NULL;
dca_offset = readw(iobase + IOAT_DCAOFFSET_OFFSET);
if (dca_offset == 0)
return NULL;
slots = ioat_dca_count_dca_slots(iobase, dca_offset);
if (slots == 0)
return NULL;
dca = alloc_dca_provider(&ioat_dca_ops,
struct_size(ioatdca, req_slots, slots));
if (!dca)
return NULL;
ioatdca = dca_priv(dca);
ioatdca->iobase = iobase;
ioatdca->dca_base = iobase + dca_offset;
ioatdca->max_requesters = slots;
/* some bios might not know to turn these on */
csi_fsb_control = readw(ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET);
if ((csi_fsb_control & IOAT3_CSI_CONTROL_PREFETCH) == 0) {
csi_fsb_control |= IOAT3_CSI_CONTROL_PREFETCH;
writew(csi_fsb_control,
ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET);
}
pcie_control = readw(ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET);
if ((pcie_control & IOAT3_PCI_CONTROL_MEMWR) == 0) {
pcie_control |= IOAT3_PCI_CONTROL_MEMWR;
writew(pcie_control,
ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET);
}
/* TODO version, compatibility and configuration checks */
/* copy out the APIC to DCA tag map */
tag_map.low =
readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_LOW);
tag_map.high =
readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_HIGH);
for (i = 0; i < 8; i++) {
bit = tag_map.full >> (8 * i);
ioatdca->tag_map[i] = bit & DCA_TAG_MAP_MASK;
}
if (dca3_tag_map_invalid(ioatdca->tag_map)) {
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
pr_warn_once("%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n",
dev_driver_string(&pdev->dev),
dev_name(&pdev->dev));
free_dca_provider(dca);
return NULL;
}
err = register_dca_provider(dca, &pdev->dev);
if (err) {
free_dca_provider(dca);
return NULL;
}
return dca;
}
| linux-master | drivers/dma/ioat/dca.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DMA driver for Xilinx Video DMA Engine
*
* Copyright (C) 2010-2014 Xilinx, Inc. All rights reserved.
*
* Based on the Freescale DMA driver.
*
* Description:
* The AXI Video Direct Memory Access (AXI VDMA) core is a soft Xilinx IP
* core that provides high-bandwidth direct memory access between memory
* and AXI4-Stream type video target peripherals. The core provides efficient
* two dimensional DMA operations with independent asynchronous read (S2MM)
* and write (MM2S) channel operation. It can be configured to have either
* one channel or two channels. If configured as two channels, one is to
* transmit to the video device (MM2S) and another is to receive from the
* video device (S2MM). Initialization, status, interrupt and management
* registers are accessed through an AXI4-Lite slave interface.
*
* The AXI Direct Memory Access (AXI DMA) core is a soft Xilinx IP core that
* provides high-bandwidth one dimensional direct memory access between memory
* and AXI4-Stream target peripherals. It supports one receive and one
* transmit channel, both of them optional at synthesis time.
*
* The AXI CDMA, is a soft IP, which provides high-bandwidth Direct Memory
* Access (DMA) between a memory-mapped source address and a memory-mapped
* destination address.
*
* The AXI Multichannel Direct Memory Access (AXI MCDMA) core is a soft
* Xilinx IP that provides high-bandwidth direct memory access between
* memory and AXI4-Stream target peripherals. It provides scatter gather
* (SG) interface with multiple channels independent configuration support.
*
*/
#include <linux/bitops.h>
#include <linux/dmapool.h>
#include <linux/dma/xilinx_dma.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include "../dmaengine.h"
/* Register/Descriptor Offsets */
#define XILINX_DMA_MM2S_CTRL_OFFSET 0x0000
#define XILINX_DMA_S2MM_CTRL_OFFSET 0x0030
#define XILINX_VDMA_MM2S_DESC_OFFSET 0x0050
#define XILINX_VDMA_S2MM_DESC_OFFSET 0x00a0
/* Control Registers */
#define XILINX_DMA_REG_DMACR 0x0000
#define XILINX_DMA_DMACR_DELAY_MAX 0xff
#define XILINX_DMA_DMACR_DELAY_SHIFT 24
#define XILINX_DMA_DMACR_FRAME_COUNT_MAX 0xff
#define XILINX_DMA_DMACR_FRAME_COUNT_SHIFT 16
#define XILINX_DMA_DMACR_ERR_IRQ BIT(14)
#define XILINX_DMA_DMACR_DLY_CNT_IRQ BIT(13)
#define XILINX_DMA_DMACR_FRM_CNT_IRQ BIT(12)
#define XILINX_DMA_DMACR_MASTER_SHIFT 8
#define XILINX_DMA_DMACR_FSYNCSRC_SHIFT 5
#define XILINX_DMA_DMACR_FRAMECNT_EN BIT(4)
#define XILINX_DMA_DMACR_GENLOCK_EN BIT(3)
#define XILINX_DMA_DMACR_RESET BIT(2)
#define XILINX_DMA_DMACR_CIRC_EN BIT(1)
#define XILINX_DMA_DMACR_RUNSTOP BIT(0)
#define XILINX_DMA_DMACR_FSYNCSRC_MASK GENMASK(6, 5)
#define XILINX_DMA_DMACR_DELAY_MASK GENMASK(31, 24)
#define XILINX_DMA_DMACR_FRAME_COUNT_MASK GENMASK(23, 16)
#define XILINX_DMA_DMACR_MASTER_MASK GENMASK(11, 8)
#define XILINX_DMA_REG_DMASR 0x0004
#define XILINX_DMA_DMASR_EOL_LATE_ERR BIT(15)
#define XILINX_DMA_DMASR_ERR_IRQ BIT(14)
#define XILINX_DMA_DMASR_DLY_CNT_IRQ BIT(13)
#define XILINX_DMA_DMASR_FRM_CNT_IRQ BIT(12)
#define XILINX_DMA_DMASR_SOF_LATE_ERR BIT(11)
#define XILINX_DMA_DMASR_SG_DEC_ERR BIT(10)
#define XILINX_DMA_DMASR_SG_SLV_ERR BIT(9)
#define XILINX_DMA_DMASR_EOF_EARLY_ERR BIT(8)
#define XILINX_DMA_DMASR_SOF_EARLY_ERR BIT(7)
#define XILINX_DMA_DMASR_DMA_DEC_ERR BIT(6)
#define XILINX_DMA_DMASR_DMA_SLAVE_ERR BIT(5)
#define XILINX_DMA_DMASR_DMA_INT_ERR BIT(4)
#define XILINX_DMA_DMASR_SG_MASK BIT(3)
#define XILINX_DMA_DMASR_IDLE BIT(1)
#define XILINX_DMA_DMASR_HALTED BIT(0)
#define XILINX_DMA_DMASR_DELAY_MASK GENMASK(31, 24)
#define XILINX_DMA_DMASR_FRAME_COUNT_MASK GENMASK(23, 16)
#define XILINX_DMA_REG_CURDESC 0x0008
#define XILINX_DMA_REG_TAILDESC 0x0010
#define XILINX_DMA_REG_REG_INDEX 0x0014
#define XILINX_DMA_REG_FRMSTORE 0x0018
#define XILINX_DMA_REG_THRESHOLD 0x001c
#define XILINX_DMA_REG_FRMPTR_STS 0x0024
#define XILINX_DMA_REG_PARK_PTR 0x0028
#define XILINX_DMA_PARK_PTR_WR_REF_SHIFT 8
#define XILINX_DMA_PARK_PTR_WR_REF_MASK GENMASK(12, 8)
#define XILINX_DMA_PARK_PTR_RD_REF_SHIFT 0
#define XILINX_DMA_PARK_PTR_RD_REF_MASK GENMASK(4, 0)
#define XILINX_DMA_REG_VDMA_VERSION 0x002c
/* Register Direct Mode Registers */
#define XILINX_DMA_REG_VSIZE 0x0000
#define XILINX_DMA_REG_HSIZE 0x0004
#define XILINX_DMA_REG_FRMDLY_STRIDE 0x0008
#define XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT 24
#define XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT 0
#define XILINX_VDMA_REG_START_ADDRESS(n) (0x000c + 4 * (n))
#define XILINX_VDMA_REG_START_ADDRESS_64(n) (0x000c + 8 * (n))
#define XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP 0x00ec
#define XILINX_VDMA_ENABLE_VERTICAL_FLIP BIT(0)
/* HW specific definitions */
#define XILINX_MCDMA_MAX_CHANS_PER_DEVICE 0x20
#define XILINX_DMA_MAX_CHANS_PER_DEVICE 0x2
#define XILINX_CDMA_MAX_CHANS_PER_DEVICE 0x1
#define XILINX_DMA_DMAXR_ALL_IRQ_MASK \
(XILINX_DMA_DMASR_FRM_CNT_IRQ | \
XILINX_DMA_DMASR_DLY_CNT_IRQ | \
XILINX_DMA_DMASR_ERR_IRQ)
#define XILINX_DMA_DMASR_ALL_ERR_MASK \
(XILINX_DMA_DMASR_EOL_LATE_ERR | \
XILINX_DMA_DMASR_SOF_LATE_ERR | \
XILINX_DMA_DMASR_SG_DEC_ERR | \
XILINX_DMA_DMASR_SG_SLV_ERR | \
XILINX_DMA_DMASR_EOF_EARLY_ERR | \
XILINX_DMA_DMASR_SOF_EARLY_ERR | \
XILINX_DMA_DMASR_DMA_DEC_ERR | \
XILINX_DMA_DMASR_DMA_SLAVE_ERR | \
XILINX_DMA_DMASR_DMA_INT_ERR)
/*
* Recoverable errors are DMA Internal error, SOF Early, EOF Early
* and SOF Late. They are only recoverable when C_FLUSH_ON_FSYNC
* is enabled in the h/w system.
*/
#define XILINX_DMA_DMASR_ERR_RECOVER_MASK \
(XILINX_DMA_DMASR_SOF_LATE_ERR | \
XILINX_DMA_DMASR_EOF_EARLY_ERR | \
XILINX_DMA_DMASR_SOF_EARLY_ERR | \
XILINX_DMA_DMASR_DMA_INT_ERR)
/* Axi VDMA Flush on Fsync bits */
#define XILINX_DMA_FLUSH_S2MM 3
#define XILINX_DMA_FLUSH_MM2S 2
#define XILINX_DMA_FLUSH_BOTH 1
/* Delay loop counter to prevent hardware failure */
#define XILINX_DMA_LOOP_COUNT 1000000
/* AXI DMA Specific Registers/Offsets */
#define XILINX_DMA_REG_SRCDSTADDR 0x18
#define XILINX_DMA_REG_BTT 0x28
/* AXI DMA Specific Masks/Bit fields */
#define XILINX_DMA_MAX_TRANS_LEN_MIN 8
#define XILINX_DMA_MAX_TRANS_LEN_MAX 23
#define XILINX_DMA_V2_MAX_TRANS_LEN_MAX 26
#define XILINX_DMA_CR_COALESCE_MAX GENMASK(23, 16)
#define XILINX_DMA_CR_DELAY_MAX GENMASK(31, 24)
#define XILINX_DMA_CR_CYCLIC_BD_EN_MASK BIT(4)
#define XILINX_DMA_CR_COALESCE_SHIFT 16
#define XILINX_DMA_CR_DELAY_SHIFT 24
#define XILINX_DMA_BD_SOP BIT(27)
#define XILINX_DMA_BD_EOP BIT(26)
#define XILINX_DMA_BD_COMP_MASK BIT(31)
#define XILINX_DMA_COALESCE_MAX 255
#define XILINX_DMA_NUM_DESCS 512
#define XILINX_DMA_NUM_APP_WORDS 5
/* AXI CDMA Specific Registers/Offsets */
#define XILINX_CDMA_REG_SRCADDR 0x18
#define XILINX_CDMA_REG_DSTADDR 0x20
/* AXI CDMA Specific Masks */
#define XILINX_CDMA_CR_SGMODE BIT(3)
#define xilinx_prep_dma_addr_t(addr) \
((dma_addr_t)((u64)addr##_##msb << 32 | (addr)))
/* AXI MCDMA Specific Registers/Offsets */
#define XILINX_MCDMA_MM2S_CTRL_OFFSET 0x0000
#define XILINX_MCDMA_S2MM_CTRL_OFFSET 0x0500
#define XILINX_MCDMA_CHEN_OFFSET 0x0008
#define XILINX_MCDMA_CH_ERR_OFFSET 0x0010
#define XILINX_MCDMA_RXINT_SER_OFFSET 0x0020
#define XILINX_MCDMA_TXINT_SER_OFFSET 0x0028
#define XILINX_MCDMA_CHAN_CR_OFFSET(x) (0x40 + (x) * 0x40)
#define XILINX_MCDMA_CHAN_SR_OFFSET(x) (0x44 + (x) * 0x40)
#define XILINX_MCDMA_CHAN_CDESC_OFFSET(x) (0x48 + (x) * 0x40)
#define XILINX_MCDMA_CHAN_TDESC_OFFSET(x) (0x50 + (x) * 0x40)
/* AXI MCDMA Specific Masks/Shifts */
#define XILINX_MCDMA_COALESCE_SHIFT 16
#define XILINX_MCDMA_COALESCE_MAX 24
#define XILINX_MCDMA_IRQ_ALL_MASK GENMASK(7, 5)
#define XILINX_MCDMA_COALESCE_MASK GENMASK(23, 16)
#define XILINX_MCDMA_CR_RUNSTOP_MASK BIT(0)
#define XILINX_MCDMA_IRQ_IOC_MASK BIT(5)
#define XILINX_MCDMA_IRQ_DELAY_MASK BIT(6)
#define XILINX_MCDMA_IRQ_ERR_MASK BIT(7)
#define XILINX_MCDMA_BD_EOP BIT(30)
#define XILINX_MCDMA_BD_SOP BIT(31)
/**
* struct xilinx_vdma_desc_hw - Hardware Descriptor
* @next_desc: Next Descriptor Pointer @0x00
* @pad1: Reserved @0x04
* @buf_addr: Buffer address @0x08
* @buf_addr_msb: MSB of Buffer address @0x0C
* @vsize: Vertical Size @0x10
* @hsize: Horizontal Size @0x14
* @stride: Number of bytes between the first
* pixels of each horizontal line @0x18
*/
struct xilinx_vdma_desc_hw {
u32 next_desc;
u32 pad1;
u32 buf_addr;
u32 buf_addr_msb;
u32 vsize;
u32 hsize;
u32 stride;
} __aligned(64);
/**
* struct xilinx_axidma_desc_hw - Hardware Descriptor for AXI DMA
* @next_desc: Next Descriptor Pointer @0x00
* @next_desc_msb: MSB of Next Descriptor Pointer @0x04
* @buf_addr: Buffer address @0x08
* @buf_addr_msb: MSB of Buffer address @0x0C
* @reserved1: Reserved @0x10
* @reserved2: Reserved @0x14
* @control: Control field @0x18
* @status: Status field @0x1C
* @app: APP Fields @0x20 - 0x30
*/
struct xilinx_axidma_desc_hw {
u32 next_desc;
u32 next_desc_msb;
u32 buf_addr;
u32 buf_addr_msb;
u32 reserved1;
u32 reserved2;
u32 control;
u32 status;
u32 app[XILINX_DMA_NUM_APP_WORDS];
} __aligned(64);
/**
* struct xilinx_aximcdma_desc_hw - Hardware Descriptor for AXI MCDMA
* @next_desc: Next Descriptor Pointer @0x00
* @next_desc_msb: MSB of Next Descriptor Pointer @0x04
* @buf_addr: Buffer address @0x08
* @buf_addr_msb: MSB of Buffer address @0x0C
* @rsvd: Reserved field @0x10
* @control: Control Information field @0x14
* @status: Status field @0x18
* @sideband_status: Status of sideband signals @0x1C
* @app: APP Fields @0x20 - 0x30
*/
struct xilinx_aximcdma_desc_hw {
u32 next_desc;
u32 next_desc_msb;
u32 buf_addr;
u32 buf_addr_msb;
u32 rsvd;
u32 control;
u32 status;
u32 sideband_status;
u32 app[XILINX_DMA_NUM_APP_WORDS];
} __aligned(64);
/**
* struct xilinx_cdma_desc_hw - Hardware Descriptor
* @next_desc: Next Descriptor Pointer @0x00
* @next_desc_msb: Next Descriptor Pointer MSB @0x04
* @src_addr: Source address @0x08
* @src_addr_msb: Source address MSB @0x0C
* @dest_addr: Destination address @0x10
* @dest_addr_msb: Destination address MSB @0x14
* @control: Control field @0x18
* @status: Status field @0x1C
*/
struct xilinx_cdma_desc_hw {
u32 next_desc;
u32 next_desc_msb;
u32 src_addr;
u32 src_addr_msb;
u32 dest_addr;
u32 dest_addr_msb;
u32 control;
u32 status;
} __aligned(64);
/**
* struct xilinx_vdma_tx_segment - Descriptor segment
* @hw: Hardware descriptor
* @node: Node in the descriptor segments list
* @phys: Physical address of segment
*/
struct xilinx_vdma_tx_segment {
struct xilinx_vdma_desc_hw hw;
struct list_head node;
dma_addr_t phys;
} __aligned(64);
/**
* struct xilinx_axidma_tx_segment - Descriptor segment
* @hw: Hardware descriptor
* @node: Node in the descriptor segments list
* @phys: Physical address of segment
*/
struct xilinx_axidma_tx_segment {
struct xilinx_axidma_desc_hw hw;
struct list_head node;
dma_addr_t phys;
} __aligned(64);
/**
* struct xilinx_aximcdma_tx_segment - Descriptor segment
* @hw: Hardware descriptor
* @node: Node in the descriptor segments list
* @phys: Physical address of segment
*/
struct xilinx_aximcdma_tx_segment {
struct xilinx_aximcdma_desc_hw hw;
struct list_head node;
dma_addr_t phys;
} __aligned(64);
/**
* struct xilinx_cdma_tx_segment - Descriptor segment
* @hw: Hardware descriptor
* @node: Node in the descriptor segments list
* @phys: Physical address of segment
*/
struct xilinx_cdma_tx_segment {
struct xilinx_cdma_desc_hw hw;
struct list_head node;
dma_addr_t phys;
} __aligned(64);
/**
* struct xilinx_dma_tx_descriptor - Per Transaction structure
* @async_tx: Async transaction descriptor
* @segments: TX segments list
* @node: Node in the channel descriptors list
* @cyclic: Check for cyclic transfers.
* @err: Whether the descriptor has an error.
* @residue: Residue of the completed descriptor
*/
struct xilinx_dma_tx_descriptor {
struct dma_async_tx_descriptor async_tx;
struct list_head segments;
struct list_head node;
bool cyclic;
bool err;
u32 residue;
};
/**
* struct xilinx_dma_chan - Driver specific DMA channel structure
* @xdev: Driver specific device structure
* @ctrl_offset: Control registers offset
* @desc_offset: TX descriptor registers offset
* @lock: Descriptor operation lock
* @pending_list: Descriptors waiting
* @active_list: Descriptors ready to submit
* @done_list: Complete descriptors
* @free_seg_list: Free descriptors
* @common: DMA common channel
* @desc_pool: Descriptors pool
* @dev: The dma device
* @irq: Channel IRQ
* @id: Channel ID
* @direction: Transfer direction
* @num_frms: Number of frames
* @has_sg: Support scatter transfers
* @cyclic: Check for cyclic transfers.
* @genlock: Support genlock mode
* @err: Channel has errors
* @idle: Check for channel idle
* @terminating: Check for channel being synchronized by user
* @tasklet: Cleanup work after irq
* @config: Device configuration info
* @flush_on_fsync: Flush on Frame sync
* @desc_pendingcount: Descriptor pending count
* @ext_addr: Indicates 64 bit addressing is supported by dma channel
* @desc_submitcount: Descriptor h/w submitted count
* @seg_v: Statically allocated segments base
* @seg_mv: Statically allocated segments base for MCDMA
* @seg_p: Physical allocated segments base
* @cyclic_seg_v: Statically allocated segment base for cyclic transfers
* @cyclic_seg_p: Physical allocated segments base for cyclic dma
* @start_transfer: Differentiate b/w DMA IP's transfer
* @stop_transfer: Differentiate b/w DMA IP's quiesce
* @tdest: TDEST value for mcdma
* @has_vflip: S2MM vertical flip
* @irq_delay: Interrupt delay timeout
*/
struct xilinx_dma_chan {
struct xilinx_dma_device *xdev;
u32 ctrl_offset;
u32 desc_offset;
spinlock_t lock;
struct list_head pending_list;
struct list_head active_list;
struct list_head done_list;
struct list_head free_seg_list;
struct dma_chan common;
struct dma_pool *desc_pool;
struct device *dev;
int irq;
int id;
enum dma_transfer_direction direction;
int num_frms;
bool has_sg;
bool cyclic;
bool genlock;
bool err;
bool idle;
bool terminating;
struct tasklet_struct tasklet;
struct xilinx_vdma_config config;
bool flush_on_fsync;
u32 desc_pendingcount;
bool ext_addr;
u32 desc_submitcount;
struct xilinx_axidma_tx_segment *seg_v;
struct xilinx_aximcdma_tx_segment *seg_mv;
dma_addr_t seg_p;
struct xilinx_axidma_tx_segment *cyclic_seg_v;
dma_addr_t cyclic_seg_p;
void (*start_transfer)(struct xilinx_dma_chan *chan);
int (*stop_transfer)(struct xilinx_dma_chan *chan);
u16 tdest;
bool has_vflip;
u8 irq_delay;
};
/**
* enum xdma_ip_type - DMA IP type.
*
* @XDMA_TYPE_AXIDMA: Axi dma ip.
* @XDMA_TYPE_CDMA: Axi cdma ip.
* @XDMA_TYPE_VDMA: Axi vdma ip.
* @XDMA_TYPE_AXIMCDMA: Axi MCDMA ip.
*
*/
enum xdma_ip_type {
XDMA_TYPE_AXIDMA = 0,
XDMA_TYPE_CDMA,
XDMA_TYPE_VDMA,
XDMA_TYPE_AXIMCDMA
};
struct xilinx_dma_config {
enum xdma_ip_type dmatype;
int (*clk_init)(struct platform_device *pdev, struct clk **axi_clk,
struct clk **tx_clk, struct clk **txs_clk,
struct clk **rx_clk, struct clk **rxs_clk);
irqreturn_t (*irq_handler)(int irq, void *data);
const int max_channels;
};
/**
* struct xilinx_dma_device - DMA device structure
* @regs: I/O mapped base address
* @dev: Device Structure
* @common: DMA device structure
* @chan: Driver specific DMA channel
* @flush_on_fsync: Flush on frame sync
* @ext_addr: Indicates 64 bit addressing is supported by dma device
* @pdev: Platform device structure pointer
* @dma_config: DMA config structure
* @axi_clk: DMA Axi4-lite interace clock
* @tx_clk: DMA mm2s clock
* @txs_clk: DMA mm2s stream clock
* @rx_clk: DMA s2mm clock
* @rxs_clk: DMA s2mm stream clock
* @s2mm_chan_id: DMA s2mm channel identifier
* @mm2s_chan_id: DMA mm2s channel identifier
* @max_buffer_len: Max buffer length
* @has_axistream_connected: AXI DMA connected to AXI Stream IP
*/
struct xilinx_dma_device {
void __iomem *regs;
struct device *dev;
struct dma_device common;
struct xilinx_dma_chan *chan[XILINX_MCDMA_MAX_CHANS_PER_DEVICE];
u32 flush_on_fsync;
bool ext_addr;
struct platform_device *pdev;
const struct xilinx_dma_config *dma_config;
struct clk *axi_clk;
struct clk *tx_clk;
struct clk *txs_clk;
struct clk *rx_clk;
struct clk *rxs_clk;
u32 s2mm_chan_id;
u32 mm2s_chan_id;
u32 max_buffer_len;
bool has_axistream_connected;
};
/* Macros */
#define to_xilinx_chan(chan) \
container_of(chan, struct xilinx_dma_chan, common)
#define to_dma_tx_descriptor(tx) \
container_of(tx, struct xilinx_dma_tx_descriptor, async_tx)
#define xilinx_dma_poll_timeout(chan, reg, val, cond, delay_us, timeout_us) \
readl_poll_timeout_atomic(chan->xdev->regs + chan->ctrl_offset + reg, \
val, cond, delay_us, timeout_us)
/* IO accessors */
static inline u32 dma_read(struct xilinx_dma_chan *chan, u32 reg)
{
return ioread32(chan->xdev->regs + reg);
}
static inline void dma_write(struct xilinx_dma_chan *chan, u32 reg, u32 value)
{
iowrite32(value, chan->xdev->regs + reg);
}
static inline void vdma_desc_write(struct xilinx_dma_chan *chan, u32 reg,
u32 value)
{
dma_write(chan, chan->desc_offset + reg, value);
}
static inline u32 dma_ctrl_read(struct xilinx_dma_chan *chan, u32 reg)
{
return dma_read(chan, chan->ctrl_offset + reg);
}
static inline void dma_ctrl_write(struct xilinx_dma_chan *chan, u32 reg,
u32 value)
{
dma_write(chan, chan->ctrl_offset + reg, value);
}
static inline void dma_ctrl_clr(struct xilinx_dma_chan *chan, u32 reg,
u32 clr)
{
dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) & ~clr);
}
static inline void dma_ctrl_set(struct xilinx_dma_chan *chan, u32 reg,
u32 set)
{
dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) | set);
}
/**
* vdma_desc_write_64 - 64-bit descriptor write
* @chan: Driver specific VDMA channel
* @reg: Register to write
* @value_lsb: lower address of the descriptor.
* @value_msb: upper address of the descriptor.
*
* Since vdma driver is trying to write to a register offset which is not a
* multiple of 64 bits(ex : 0x5c), we are writing as two separate 32 bits
* instead of a single 64 bit register write.
*/
static inline void vdma_desc_write_64(struct xilinx_dma_chan *chan, u32 reg,
u32 value_lsb, u32 value_msb)
{
/* Write the lsb 32 bits*/
writel(value_lsb, chan->xdev->regs + chan->desc_offset + reg);
/* Write the msb 32 bits */
writel(value_msb, chan->xdev->regs + chan->desc_offset + reg + 4);
}
static inline void dma_writeq(struct xilinx_dma_chan *chan, u32 reg, u64 value)
{
lo_hi_writeq(value, chan->xdev->regs + chan->ctrl_offset + reg);
}
static inline void xilinx_write(struct xilinx_dma_chan *chan, u32 reg,
dma_addr_t addr)
{
if (chan->ext_addr)
dma_writeq(chan, reg, addr);
else
dma_ctrl_write(chan, reg, addr);
}
static inline void xilinx_axidma_buf(struct xilinx_dma_chan *chan,
struct xilinx_axidma_desc_hw *hw,
dma_addr_t buf_addr, size_t sg_used,
size_t period_len)
{
if (chan->ext_addr) {
hw->buf_addr = lower_32_bits(buf_addr + sg_used + period_len);
hw->buf_addr_msb = upper_32_bits(buf_addr + sg_used +
period_len);
} else {
hw->buf_addr = buf_addr + sg_used + period_len;
}
}
static inline void xilinx_aximcdma_buf(struct xilinx_dma_chan *chan,
struct xilinx_aximcdma_desc_hw *hw,
dma_addr_t buf_addr, size_t sg_used)
{
if (chan->ext_addr) {
hw->buf_addr = lower_32_bits(buf_addr + sg_used);
hw->buf_addr_msb = upper_32_bits(buf_addr + sg_used);
} else {
hw->buf_addr = buf_addr + sg_used;
}
}
/**
* xilinx_dma_get_metadata_ptr- Populate metadata pointer and payload length
* @tx: async transaction descriptor
* @payload_len: metadata payload length
* @max_len: metadata max length
* Return: The app field pointer.
*/
static void *xilinx_dma_get_metadata_ptr(struct dma_async_tx_descriptor *tx,
size_t *payload_len, size_t *max_len)
{
struct xilinx_dma_tx_descriptor *desc = to_dma_tx_descriptor(tx);
struct xilinx_axidma_tx_segment *seg;
*max_len = *payload_len = sizeof(u32) * XILINX_DMA_NUM_APP_WORDS;
seg = list_first_entry(&desc->segments,
struct xilinx_axidma_tx_segment, node);
return seg->hw.app;
}
static struct dma_descriptor_metadata_ops xilinx_dma_metadata_ops = {
.get_ptr = xilinx_dma_get_metadata_ptr,
};
/* -----------------------------------------------------------------------------
* Descriptors and segments alloc and free
*/
/**
* xilinx_vdma_alloc_tx_segment - Allocate transaction segment
* @chan: Driver specific DMA channel
*
* Return: The allocated segment on success and NULL on failure.
*/
static struct xilinx_vdma_tx_segment *
xilinx_vdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
{
struct xilinx_vdma_tx_segment *segment;
dma_addr_t phys;
segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys);
if (!segment)
return NULL;
segment->phys = phys;
return segment;
}
/**
* xilinx_cdma_alloc_tx_segment - Allocate transaction segment
* @chan: Driver specific DMA channel
*
* Return: The allocated segment on success and NULL on failure.
*/
static struct xilinx_cdma_tx_segment *
xilinx_cdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
{
struct xilinx_cdma_tx_segment *segment;
dma_addr_t phys;
segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys);
if (!segment)
return NULL;
segment->phys = phys;
return segment;
}
/**
* xilinx_axidma_alloc_tx_segment - Allocate transaction segment
* @chan: Driver specific DMA channel
*
* Return: The allocated segment on success and NULL on failure.
*/
static struct xilinx_axidma_tx_segment *
xilinx_axidma_alloc_tx_segment(struct xilinx_dma_chan *chan)
{
struct xilinx_axidma_tx_segment *segment = NULL;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
if (!list_empty(&chan->free_seg_list)) {
segment = list_first_entry(&chan->free_seg_list,
struct xilinx_axidma_tx_segment,
node);
list_del(&segment->node);
}
spin_unlock_irqrestore(&chan->lock, flags);
if (!segment)
dev_dbg(chan->dev, "Could not find free tx segment\n");
return segment;
}
/**
* xilinx_aximcdma_alloc_tx_segment - Allocate transaction segment
* @chan: Driver specific DMA channel
*
* Return: The allocated segment on success and NULL on failure.
*/
static struct xilinx_aximcdma_tx_segment *
xilinx_aximcdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
{
struct xilinx_aximcdma_tx_segment *segment = NULL;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
if (!list_empty(&chan->free_seg_list)) {
segment = list_first_entry(&chan->free_seg_list,
struct xilinx_aximcdma_tx_segment,
node);
list_del(&segment->node);
}
spin_unlock_irqrestore(&chan->lock, flags);
return segment;
}
static void xilinx_dma_clean_hw_desc(struct xilinx_axidma_desc_hw *hw)
{
u32 next_desc = hw->next_desc;
u32 next_desc_msb = hw->next_desc_msb;
memset(hw, 0, sizeof(struct xilinx_axidma_desc_hw));
hw->next_desc = next_desc;
hw->next_desc_msb = next_desc_msb;
}
static void xilinx_mcdma_clean_hw_desc(struct xilinx_aximcdma_desc_hw *hw)
{
u32 next_desc = hw->next_desc;
u32 next_desc_msb = hw->next_desc_msb;
memset(hw, 0, sizeof(struct xilinx_aximcdma_desc_hw));
hw->next_desc = next_desc;
hw->next_desc_msb = next_desc_msb;
}
/**
* xilinx_dma_free_tx_segment - Free transaction segment
* @chan: Driver specific DMA channel
* @segment: DMA transaction segment
*/
static void xilinx_dma_free_tx_segment(struct xilinx_dma_chan *chan,
struct xilinx_axidma_tx_segment *segment)
{
xilinx_dma_clean_hw_desc(&segment->hw);
list_add_tail(&segment->node, &chan->free_seg_list);
}
/**
* xilinx_mcdma_free_tx_segment - Free transaction segment
* @chan: Driver specific DMA channel
* @segment: DMA transaction segment
*/
static void xilinx_mcdma_free_tx_segment(struct xilinx_dma_chan *chan,
struct xilinx_aximcdma_tx_segment *
segment)
{
xilinx_mcdma_clean_hw_desc(&segment->hw);
list_add_tail(&segment->node, &chan->free_seg_list);
}
/**
* xilinx_cdma_free_tx_segment - Free transaction segment
* @chan: Driver specific DMA channel
* @segment: DMA transaction segment
*/
static void xilinx_cdma_free_tx_segment(struct xilinx_dma_chan *chan,
struct xilinx_cdma_tx_segment *segment)
{
dma_pool_free(chan->desc_pool, segment, segment->phys);
}
/**
* xilinx_vdma_free_tx_segment - Free transaction segment
* @chan: Driver specific DMA channel
* @segment: DMA transaction segment
*/
static void xilinx_vdma_free_tx_segment(struct xilinx_dma_chan *chan,
struct xilinx_vdma_tx_segment *segment)
{
dma_pool_free(chan->desc_pool, segment, segment->phys);
}
/**
* xilinx_dma_alloc_tx_descriptor - Allocate transaction descriptor
* @chan: Driver specific DMA channel
*
* Return: The allocated descriptor on success and NULL on failure.
*/
static struct xilinx_dma_tx_descriptor *
xilinx_dma_alloc_tx_descriptor(struct xilinx_dma_chan *chan)
{
struct xilinx_dma_tx_descriptor *desc;
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
INIT_LIST_HEAD(&desc->segments);
return desc;
}
/**
* xilinx_dma_free_tx_descriptor - Free transaction descriptor
* @chan: Driver specific DMA channel
* @desc: DMA transaction descriptor
*/
static void
xilinx_dma_free_tx_descriptor(struct xilinx_dma_chan *chan,
struct xilinx_dma_tx_descriptor *desc)
{
struct xilinx_vdma_tx_segment *segment, *next;
struct xilinx_cdma_tx_segment *cdma_segment, *cdma_next;
struct xilinx_axidma_tx_segment *axidma_segment, *axidma_next;
struct xilinx_aximcdma_tx_segment *aximcdma_segment, *aximcdma_next;
if (!desc)
return;
if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
list_for_each_entry_safe(segment, next, &desc->segments, node) {
list_del(&segment->node);
xilinx_vdma_free_tx_segment(chan, segment);
}
} else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
list_for_each_entry_safe(cdma_segment, cdma_next,
&desc->segments, node) {
list_del(&cdma_segment->node);
xilinx_cdma_free_tx_segment(chan, cdma_segment);
}
} else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
list_for_each_entry_safe(axidma_segment, axidma_next,
&desc->segments, node) {
list_del(&axidma_segment->node);
xilinx_dma_free_tx_segment(chan, axidma_segment);
}
} else {
list_for_each_entry_safe(aximcdma_segment, aximcdma_next,
&desc->segments, node) {
list_del(&aximcdma_segment->node);
xilinx_mcdma_free_tx_segment(chan, aximcdma_segment);
}
}
kfree(desc);
}
/* Required functions */
/**
* xilinx_dma_free_desc_list - Free descriptors list
* @chan: Driver specific DMA channel
* @list: List to parse and delete the descriptor
*/
static void xilinx_dma_free_desc_list(struct xilinx_dma_chan *chan,
struct list_head *list)
{
struct xilinx_dma_tx_descriptor *desc, *next;
list_for_each_entry_safe(desc, next, list, node) {
list_del(&desc->node);
xilinx_dma_free_tx_descriptor(chan, desc);
}
}
/**
* xilinx_dma_free_descriptors - Free channel descriptors
* @chan: Driver specific DMA channel
*/
static void xilinx_dma_free_descriptors(struct xilinx_dma_chan *chan)
{
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
xilinx_dma_free_desc_list(chan, &chan->pending_list);
xilinx_dma_free_desc_list(chan, &chan->done_list);
xilinx_dma_free_desc_list(chan, &chan->active_list);
spin_unlock_irqrestore(&chan->lock, flags);
}
/**
* xilinx_dma_free_chan_resources - Free channel resources
* @dchan: DMA channel
*/
static void xilinx_dma_free_chan_resources(struct dma_chan *dchan)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
unsigned long flags;
dev_dbg(chan->dev, "Free all channel resources.\n");
xilinx_dma_free_descriptors(chan);
if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
spin_lock_irqsave(&chan->lock, flags);
INIT_LIST_HEAD(&chan->free_seg_list);
spin_unlock_irqrestore(&chan->lock, flags);
/* Free memory that is allocated for BD */
dma_free_coherent(chan->dev, sizeof(*chan->seg_v) *
XILINX_DMA_NUM_DESCS, chan->seg_v,
chan->seg_p);
/* Free Memory that is allocated for cyclic DMA Mode */
dma_free_coherent(chan->dev, sizeof(*chan->cyclic_seg_v),
chan->cyclic_seg_v, chan->cyclic_seg_p);
}
if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
spin_lock_irqsave(&chan->lock, flags);
INIT_LIST_HEAD(&chan->free_seg_list);
spin_unlock_irqrestore(&chan->lock, flags);
/* Free memory that is allocated for BD */
dma_free_coherent(chan->dev, sizeof(*chan->seg_mv) *
XILINX_DMA_NUM_DESCS, chan->seg_mv,
chan->seg_p);
}
if (chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIDMA &&
chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIMCDMA) {
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
}
}
/**
* xilinx_dma_get_residue - Compute residue for a given descriptor
* @chan: Driver specific dma channel
* @desc: dma transaction descriptor
*
* Return: The number of residue bytes for the descriptor.
*/
static u32 xilinx_dma_get_residue(struct xilinx_dma_chan *chan,
struct xilinx_dma_tx_descriptor *desc)
{
struct xilinx_cdma_tx_segment *cdma_seg;
struct xilinx_axidma_tx_segment *axidma_seg;
struct xilinx_aximcdma_tx_segment *aximcdma_seg;
struct xilinx_cdma_desc_hw *cdma_hw;
struct xilinx_axidma_desc_hw *axidma_hw;
struct xilinx_aximcdma_desc_hw *aximcdma_hw;
struct list_head *entry;
u32 residue = 0;
list_for_each(entry, &desc->segments) {
if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
cdma_seg = list_entry(entry,
struct xilinx_cdma_tx_segment,
node);
cdma_hw = &cdma_seg->hw;
residue += (cdma_hw->control - cdma_hw->status) &
chan->xdev->max_buffer_len;
} else if (chan->xdev->dma_config->dmatype ==
XDMA_TYPE_AXIDMA) {
axidma_seg = list_entry(entry,
struct xilinx_axidma_tx_segment,
node);
axidma_hw = &axidma_seg->hw;
residue += (axidma_hw->control - axidma_hw->status) &
chan->xdev->max_buffer_len;
} else {
aximcdma_seg =
list_entry(entry,
struct xilinx_aximcdma_tx_segment,
node);
aximcdma_hw = &aximcdma_seg->hw;
residue +=
(aximcdma_hw->control - aximcdma_hw->status) &
chan->xdev->max_buffer_len;
}
}
return residue;
}
/**
* xilinx_dma_chan_handle_cyclic - Cyclic dma callback
* @chan: Driver specific dma channel
* @desc: dma transaction descriptor
* @flags: flags for spin lock
*/
static void xilinx_dma_chan_handle_cyclic(struct xilinx_dma_chan *chan,
struct xilinx_dma_tx_descriptor *desc,
unsigned long *flags)
{
struct dmaengine_desc_callback cb;
dmaengine_desc_get_callback(&desc->async_tx, &cb);
if (dmaengine_desc_callback_valid(&cb)) {
spin_unlock_irqrestore(&chan->lock, *flags);
dmaengine_desc_callback_invoke(&cb, NULL);
spin_lock_irqsave(&chan->lock, *flags);
}
}
/**
* xilinx_dma_chan_desc_cleanup - Clean channel descriptors
* @chan: Driver specific DMA channel
*/
static void xilinx_dma_chan_desc_cleanup(struct xilinx_dma_chan *chan)
{
struct xilinx_dma_tx_descriptor *desc, *next;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
list_for_each_entry_safe(desc, next, &chan->done_list, node) {
struct dmaengine_result result;
if (desc->cyclic) {
xilinx_dma_chan_handle_cyclic(chan, desc, &flags);
break;
}
/* Remove from the list of running transactions */
list_del(&desc->node);
if (unlikely(desc->err)) {
if (chan->direction == DMA_DEV_TO_MEM)
result.result = DMA_TRANS_READ_FAILED;
else
result.result = DMA_TRANS_WRITE_FAILED;
} else {
result.result = DMA_TRANS_NOERROR;
}
result.residue = desc->residue;
/* Run the link descriptor callback function */
spin_unlock_irqrestore(&chan->lock, flags);
dmaengine_desc_get_callback_invoke(&desc->async_tx, &result);
spin_lock_irqsave(&chan->lock, flags);
/* Run any dependencies, then free the descriptor */
dma_run_dependencies(&desc->async_tx);
xilinx_dma_free_tx_descriptor(chan, desc);
/*
* While we ran a callback the user called a terminate function,
* which takes care of cleaning up any remaining descriptors
*/
if (chan->terminating)
break;
}
spin_unlock_irqrestore(&chan->lock, flags);
}
/**
* xilinx_dma_do_tasklet - Schedule completion tasklet
* @t: Pointer to the Xilinx DMA channel structure
*/
static void xilinx_dma_do_tasklet(struct tasklet_struct *t)
{
struct xilinx_dma_chan *chan = from_tasklet(chan, t, tasklet);
xilinx_dma_chan_desc_cleanup(chan);
}
/**
* xilinx_dma_alloc_chan_resources - Allocate channel resources
* @dchan: DMA channel
*
* Return: '0' on success and failure value on error
*/
static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
int i;
/* Has this channel already been allocated? */
if (chan->desc_pool)
return 0;
/*
* We need the descriptor to be aligned to 64bytes
* for meeting Xilinx VDMA specification requirement.
*/
if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
/* Allocate the buffer descriptors. */
chan->seg_v = dma_alloc_coherent(chan->dev,
sizeof(*chan->seg_v) * XILINX_DMA_NUM_DESCS,
&chan->seg_p, GFP_KERNEL);
if (!chan->seg_v) {
dev_err(chan->dev,
"unable to allocate channel %d descriptors\n",
chan->id);
return -ENOMEM;
}
/*
* For cyclic DMA mode we need to program the tail Descriptor
* register with a value which is not a part of the BD chain
* so allocating a desc segment during channel allocation for
* programming tail descriptor.
*/
chan->cyclic_seg_v = dma_alloc_coherent(chan->dev,
sizeof(*chan->cyclic_seg_v),
&chan->cyclic_seg_p,
GFP_KERNEL);
if (!chan->cyclic_seg_v) {
dev_err(chan->dev,
"unable to allocate desc segment for cyclic DMA\n");
dma_free_coherent(chan->dev, sizeof(*chan->seg_v) *
XILINX_DMA_NUM_DESCS, chan->seg_v,
chan->seg_p);
return -ENOMEM;
}
chan->cyclic_seg_v->phys = chan->cyclic_seg_p;
for (i = 0; i < XILINX_DMA_NUM_DESCS; i++) {
chan->seg_v[i].hw.next_desc =
lower_32_bits(chan->seg_p + sizeof(*chan->seg_v) *
((i + 1) % XILINX_DMA_NUM_DESCS));
chan->seg_v[i].hw.next_desc_msb =
upper_32_bits(chan->seg_p + sizeof(*chan->seg_v) *
((i + 1) % XILINX_DMA_NUM_DESCS));
chan->seg_v[i].phys = chan->seg_p +
sizeof(*chan->seg_v) * i;
list_add_tail(&chan->seg_v[i].node,
&chan->free_seg_list);
}
} else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
/* Allocate the buffer descriptors. */
chan->seg_mv = dma_alloc_coherent(chan->dev,
sizeof(*chan->seg_mv) *
XILINX_DMA_NUM_DESCS,
&chan->seg_p, GFP_KERNEL);
if (!chan->seg_mv) {
dev_err(chan->dev,
"unable to allocate channel %d descriptors\n",
chan->id);
return -ENOMEM;
}
for (i = 0; i < XILINX_DMA_NUM_DESCS; i++) {
chan->seg_mv[i].hw.next_desc =
lower_32_bits(chan->seg_p + sizeof(*chan->seg_mv) *
((i + 1) % XILINX_DMA_NUM_DESCS));
chan->seg_mv[i].hw.next_desc_msb =
upper_32_bits(chan->seg_p + sizeof(*chan->seg_mv) *
((i + 1) % XILINX_DMA_NUM_DESCS));
chan->seg_mv[i].phys = chan->seg_p +
sizeof(*chan->seg_mv) * i;
list_add_tail(&chan->seg_mv[i].node,
&chan->free_seg_list);
}
} else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
chan->desc_pool = dma_pool_create("xilinx_cdma_desc_pool",
chan->dev,
sizeof(struct xilinx_cdma_tx_segment),
__alignof__(struct xilinx_cdma_tx_segment),
0);
} else {
chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool",
chan->dev,
sizeof(struct xilinx_vdma_tx_segment),
__alignof__(struct xilinx_vdma_tx_segment),
0);
}
if (!chan->desc_pool &&
((chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIDMA) &&
chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIMCDMA)) {
dev_err(chan->dev,
"unable to allocate channel %d descriptor pool\n",
chan->id);
return -ENOMEM;
}
dma_cookie_init(dchan);
if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
/* For AXI DMA resetting once channel will reset the
* other channel as well so enable the interrupts here.
*/
dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
XILINX_DMA_DMAXR_ALL_IRQ_MASK);
}
if ((chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) && chan->has_sg)
dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
XILINX_CDMA_CR_SGMODE);
return 0;
}
/**
* xilinx_dma_calc_copysize - Calculate the amount of data to copy
* @chan: Driver specific DMA channel
* @size: Total data that needs to be copied
* @done: Amount of data that has been already copied
*
* Return: Amount of data that has to be copied
*/
static int xilinx_dma_calc_copysize(struct xilinx_dma_chan *chan,
int size, int done)
{
size_t copy;
copy = min_t(size_t, size - done,
chan->xdev->max_buffer_len);
if ((copy + done < size) &&
chan->xdev->common.copy_align) {
/*
* If this is not the last descriptor, make sure
* the next one will be properly aligned
*/
copy = rounddown(copy,
(1 << chan->xdev->common.copy_align));
}
return copy;
}
/**
* xilinx_dma_tx_status - Get DMA transaction status
* @dchan: DMA channel
* @cookie: Transaction identifier
* @txstate: Transaction state
*
* Return: DMA transaction status
*/
static enum dma_status xilinx_dma_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dma_tx_descriptor *desc;
enum dma_status ret;
unsigned long flags;
u32 residue = 0;
ret = dma_cookie_status(dchan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&chan->lock, flags);
if (!list_empty(&chan->active_list)) {
desc = list_last_entry(&chan->active_list,
struct xilinx_dma_tx_descriptor, node);
/*
* VDMA and simple mode do not support residue reporting, so the
* residue field will always be 0.
*/
if (chan->has_sg && chan->xdev->dma_config->dmatype != XDMA_TYPE_VDMA)
residue = xilinx_dma_get_residue(chan, desc);
}
spin_unlock_irqrestore(&chan->lock, flags);
dma_set_residue(txstate, residue);
return ret;
}
/**
* xilinx_dma_stop_transfer - Halt DMA channel
* @chan: Driver specific DMA channel
*
* Return: '0' on success and failure value on error
*/
static int xilinx_dma_stop_transfer(struct xilinx_dma_chan *chan)
{
u32 val;
dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP);
/* Wait for the hardware to halt */
return xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
val & XILINX_DMA_DMASR_HALTED, 0,
XILINX_DMA_LOOP_COUNT);
}
/**
* xilinx_cdma_stop_transfer - Wait for the current transfer to complete
* @chan: Driver specific DMA channel
*
* Return: '0' on success and failure value on error
*/
static int xilinx_cdma_stop_transfer(struct xilinx_dma_chan *chan)
{
u32 val;
return xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
val & XILINX_DMA_DMASR_IDLE, 0,
XILINX_DMA_LOOP_COUNT);
}
/**
* xilinx_dma_start - Start DMA channel
* @chan: Driver specific DMA channel
*/
static void xilinx_dma_start(struct xilinx_dma_chan *chan)
{
int err;
u32 val;
dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP);
/* Wait for the hardware to start */
err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
!(val & XILINX_DMA_DMASR_HALTED), 0,
XILINX_DMA_LOOP_COUNT);
if (err) {
dev_err(chan->dev, "Cannot start channel %p: %x\n",
chan, dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));
chan->err = true;
}
}
/**
* xilinx_vdma_start_transfer - Starts VDMA transfer
* @chan: Driver specific channel struct pointer
*/
static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan)
{
struct xilinx_vdma_config *config = &chan->config;
struct xilinx_dma_tx_descriptor *desc;
u32 reg, j;
struct xilinx_vdma_tx_segment *segment, *last = NULL;
int i = 0;
/* This function was invoked with lock held */
if (chan->err)
return;
if (!chan->idle)
return;
if (list_empty(&chan->pending_list))
return;
desc = list_first_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
/* Configure the hardware using info in the config structure */
if (chan->has_vflip) {
reg = dma_read(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP);
reg &= ~XILINX_VDMA_ENABLE_VERTICAL_FLIP;
reg |= config->vflip_en;
dma_write(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP,
reg);
}
reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
if (config->frm_cnt_en)
reg |= XILINX_DMA_DMACR_FRAMECNT_EN;
else
reg &= ~XILINX_DMA_DMACR_FRAMECNT_EN;
/* If not parking, enable circular mode */
if (config->park)
reg &= ~XILINX_DMA_DMACR_CIRC_EN;
else
reg |= XILINX_DMA_DMACR_CIRC_EN;
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
j = chan->desc_submitcount;
reg = dma_read(chan, XILINX_DMA_REG_PARK_PTR);
if (chan->direction == DMA_MEM_TO_DEV) {
reg &= ~XILINX_DMA_PARK_PTR_RD_REF_MASK;
reg |= j << XILINX_DMA_PARK_PTR_RD_REF_SHIFT;
} else {
reg &= ~XILINX_DMA_PARK_PTR_WR_REF_MASK;
reg |= j << XILINX_DMA_PARK_PTR_WR_REF_SHIFT;
}
dma_write(chan, XILINX_DMA_REG_PARK_PTR, reg);
/* Start the hardware */
xilinx_dma_start(chan);
if (chan->err)
return;
/* Start the transfer */
if (chan->desc_submitcount < chan->num_frms)
i = chan->desc_submitcount;
list_for_each_entry(segment, &desc->segments, node) {
if (chan->ext_addr)
vdma_desc_write_64(chan,
XILINX_VDMA_REG_START_ADDRESS_64(i++),
segment->hw.buf_addr,
segment->hw.buf_addr_msb);
else
vdma_desc_write(chan,
XILINX_VDMA_REG_START_ADDRESS(i++),
segment->hw.buf_addr);
last = segment;
}
if (!last)
return;
/* HW expects these parameters to be same for one transaction */
vdma_desc_write(chan, XILINX_DMA_REG_HSIZE, last->hw.hsize);
vdma_desc_write(chan, XILINX_DMA_REG_FRMDLY_STRIDE,
last->hw.stride);
vdma_desc_write(chan, XILINX_DMA_REG_VSIZE, last->hw.vsize);
chan->desc_submitcount++;
chan->desc_pendingcount--;
list_move_tail(&desc->node, &chan->active_list);
if (chan->desc_submitcount == chan->num_frms)
chan->desc_submitcount = 0;
chan->idle = false;
}
/**
* xilinx_cdma_start_transfer - Starts cdma transfer
* @chan: Driver specific channel struct pointer
*/
static void xilinx_cdma_start_transfer(struct xilinx_dma_chan *chan)
{
struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
struct xilinx_cdma_tx_segment *tail_segment;
u32 ctrl_reg = dma_read(chan, XILINX_DMA_REG_DMACR);
if (chan->err)
return;
if (!chan->idle)
return;
if (list_empty(&chan->pending_list))
return;
head_desc = list_first_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
tail_desc = list_last_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_cdma_tx_segment, node);
if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) {
ctrl_reg &= ~XILINX_DMA_CR_COALESCE_MAX;
ctrl_reg |= chan->desc_pendingcount <<
XILINX_DMA_CR_COALESCE_SHIFT;
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, ctrl_reg);
}
if (chan->has_sg) {
dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR,
XILINX_CDMA_CR_SGMODE);
dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
XILINX_CDMA_CR_SGMODE);
xilinx_write(chan, XILINX_DMA_REG_CURDESC,
head_desc->async_tx.phys);
/* Update tail ptr register which will start the transfer */
xilinx_write(chan, XILINX_DMA_REG_TAILDESC,
tail_segment->phys);
} else {
/* In simple mode */
struct xilinx_cdma_tx_segment *segment;
struct xilinx_cdma_desc_hw *hw;
segment = list_first_entry(&head_desc->segments,
struct xilinx_cdma_tx_segment,
node);
hw = &segment->hw;
xilinx_write(chan, XILINX_CDMA_REG_SRCADDR,
xilinx_prep_dma_addr_t(hw->src_addr));
xilinx_write(chan, XILINX_CDMA_REG_DSTADDR,
xilinx_prep_dma_addr_t(hw->dest_addr));
/* Start the transfer */
dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
hw->control & chan->xdev->max_buffer_len);
}
list_splice_tail_init(&chan->pending_list, &chan->active_list);
chan->desc_pendingcount = 0;
chan->idle = false;
}
/**
* xilinx_dma_start_transfer - Starts DMA transfer
* @chan: Driver specific channel struct pointer
*/
static void xilinx_dma_start_transfer(struct xilinx_dma_chan *chan)
{
struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
struct xilinx_axidma_tx_segment *tail_segment;
u32 reg;
if (chan->err)
return;
if (list_empty(&chan->pending_list))
return;
if (!chan->idle)
return;
head_desc = list_first_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
tail_desc = list_last_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_axidma_tx_segment, node);
reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) {
reg &= ~XILINX_DMA_CR_COALESCE_MAX;
reg |= chan->desc_pendingcount <<
XILINX_DMA_CR_COALESCE_SHIFT;
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
}
if (chan->has_sg)
xilinx_write(chan, XILINX_DMA_REG_CURDESC,
head_desc->async_tx.phys);
reg &= ~XILINX_DMA_CR_DELAY_MAX;
reg |= chan->irq_delay << XILINX_DMA_CR_DELAY_SHIFT;
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
xilinx_dma_start(chan);
if (chan->err)
return;
/* Start the transfer */
if (chan->has_sg) {
if (chan->cyclic)
xilinx_write(chan, XILINX_DMA_REG_TAILDESC,
chan->cyclic_seg_v->phys);
else
xilinx_write(chan, XILINX_DMA_REG_TAILDESC,
tail_segment->phys);
} else {
struct xilinx_axidma_tx_segment *segment;
struct xilinx_axidma_desc_hw *hw;
segment = list_first_entry(&head_desc->segments,
struct xilinx_axidma_tx_segment,
node);
hw = &segment->hw;
xilinx_write(chan, XILINX_DMA_REG_SRCDSTADDR,
xilinx_prep_dma_addr_t(hw->buf_addr));
/* Start the transfer */
dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
hw->control & chan->xdev->max_buffer_len);
}
list_splice_tail_init(&chan->pending_list, &chan->active_list);
chan->desc_pendingcount = 0;
chan->idle = false;
}
/**
* xilinx_mcdma_start_transfer - Starts MCDMA transfer
* @chan: Driver specific channel struct pointer
*/
static void xilinx_mcdma_start_transfer(struct xilinx_dma_chan *chan)
{
struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
struct xilinx_aximcdma_tx_segment *tail_segment;
u32 reg;
/*
* lock has been held by calling functions, so we don't need it
* to take it here again.
*/
if (chan->err)
return;
if (!chan->idle)
return;
if (list_empty(&chan->pending_list))
return;
head_desc = list_first_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
tail_desc = list_last_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_aximcdma_tx_segment, node);
reg = dma_ctrl_read(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest));
if (chan->desc_pendingcount <= XILINX_MCDMA_COALESCE_MAX) {
reg &= ~XILINX_MCDMA_COALESCE_MASK;
reg |= chan->desc_pendingcount <<
XILINX_MCDMA_COALESCE_SHIFT;
}
reg |= XILINX_MCDMA_IRQ_ALL_MASK;
dma_ctrl_write(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest), reg);
/* Program current descriptor */
xilinx_write(chan, XILINX_MCDMA_CHAN_CDESC_OFFSET(chan->tdest),
head_desc->async_tx.phys);
/* Program channel enable register */
reg = dma_ctrl_read(chan, XILINX_MCDMA_CHEN_OFFSET);
reg |= BIT(chan->tdest);
dma_ctrl_write(chan, XILINX_MCDMA_CHEN_OFFSET, reg);
/* Start the fetch of BDs for the channel */
reg = dma_ctrl_read(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest));
reg |= XILINX_MCDMA_CR_RUNSTOP_MASK;
dma_ctrl_write(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest), reg);
xilinx_dma_start(chan);
if (chan->err)
return;
/* Start the transfer */
xilinx_write(chan, XILINX_MCDMA_CHAN_TDESC_OFFSET(chan->tdest),
tail_segment->phys);
list_splice_tail_init(&chan->pending_list, &chan->active_list);
chan->desc_pendingcount = 0;
chan->idle = false;
}
/**
* xilinx_dma_issue_pending - Issue pending transactions
* @dchan: DMA channel
*/
static void xilinx_dma_issue_pending(struct dma_chan *dchan)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
chan->start_transfer(chan);
spin_unlock_irqrestore(&chan->lock, flags);
}
/**
* xilinx_dma_device_config - Configure the DMA channel
* @dchan: DMA channel
* @config: channel configuration
*
* Return: 0 always.
*/
static int xilinx_dma_device_config(struct dma_chan *dchan,
struct dma_slave_config *config)
{
return 0;
}
/**
* xilinx_dma_complete_descriptor - Mark the active descriptor as complete
* @chan : xilinx DMA channel
*
* CONTEXT: hardirq
*/
static void xilinx_dma_complete_descriptor(struct xilinx_dma_chan *chan)
{
struct xilinx_dma_tx_descriptor *desc, *next;
/* This function was invoked with lock held */
if (list_empty(&chan->active_list))
return;
list_for_each_entry_safe(desc, next, &chan->active_list, node) {
if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
struct xilinx_axidma_tx_segment *seg;
seg = list_last_entry(&desc->segments,
struct xilinx_axidma_tx_segment, node);
if (!(seg->hw.status & XILINX_DMA_BD_COMP_MASK) && chan->has_sg)
break;
}
if (chan->has_sg && chan->xdev->dma_config->dmatype !=
XDMA_TYPE_VDMA)
desc->residue = xilinx_dma_get_residue(chan, desc);
else
desc->residue = 0;
desc->err = chan->err;
list_del(&desc->node);
if (!desc->cyclic)
dma_cookie_complete(&desc->async_tx);
list_add_tail(&desc->node, &chan->done_list);
}
}
/**
* xilinx_dma_reset - Reset DMA channel
* @chan: Driver specific DMA channel
*
* Return: '0' on success and failure value on error
*/
static int xilinx_dma_reset(struct xilinx_dma_chan *chan)
{
int err;
u32 tmp;
dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RESET);
/* Wait for the hardware to finish reset */
err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMACR, tmp,
!(tmp & XILINX_DMA_DMACR_RESET), 0,
XILINX_DMA_LOOP_COUNT);
if (err) {
dev_err(chan->dev, "reset timeout, cr %x, sr %x\n",
dma_ctrl_read(chan, XILINX_DMA_REG_DMACR),
dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));
return -ETIMEDOUT;
}
chan->err = false;
chan->idle = true;
chan->desc_pendingcount = 0;
chan->desc_submitcount = 0;
return err;
}
/**
* xilinx_dma_chan_reset - Reset DMA channel and enable interrupts
* @chan: Driver specific DMA channel
*
* Return: '0' on success and failure value on error
*/
static int xilinx_dma_chan_reset(struct xilinx_dma_chan *chan)
{
int err;
/* Reset VDMA */
err = xilinx_dma_reset(chan);
if (err)
return err;
/* Enable interrupts */
dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
XILINX_DMA_DMAXR_ALL_IRQ_MASK);
return 0;
}
/**
* xilinx_mcdma_irq_handler - MCDMA Interrupt handler
* @irq: IRQ number
* @data: Pointer to the Xilinx MCDMA channel structure
*
* Return: IRQ_HANDLED/IRQ_NONE
*/
static irqreturn_t xilinx_mcdma_irq_handler(int irq, void *data)
{
struct xilinx_dma_chan *chan = data;
u32 status, ser_offset, chan_sermask, chan_offset = 0, chan_id;
if (chan->direction == DMA_DEV_TO_MEM)
ser_offset = XILINX_MCDMA_RXINT_SER_OFFSET;
else
ser_offset = XILINX_MCDMA_TXINT_SER_OFFSET;
/* Read the channel id raising the interrupt*/
chan_sermask = dma_ctrl_read(chan, ser_offset);
chan_id = ffs(chan_sermask);
if (!chan_id)
return IRQ_NONE;
if (chan->direction == DMA_DEV_TO_MEM)
chan_offset = chan->xdev->dma_config->max_channels / 2;
chan_offset = chan_offset + (chan_id - 1);
chan = chan->xdev->chan[chan_offset];
/* Read the status and ack the interrupts. */
status = dma_ctrl_read(chan, XILINX_MCDMA_CHAN_SR_OFFSET(chan->tdest));
if (!(status & XILINX_MCDMA_IRQ_ALL_MASK))
return IRQ_NONE;
dma_ctrl_write(chan, XILINX_MCDMA_CHAN_SR_OFFSET(chan->tdest),
status & XILINX_MCDMA_IRQ_ALL_MASK);
if (status & XILINX_MCDMA_IRQ_ERR_MASK) {
dev_err(chan->dev, "Channel %p has errors %x cdr %x tdr %x\n",
chan,
dma_ctrl_read(chan, XILINX_MCDMA_CH_ERR_OFFSET),
dma_ctrl_read(chan, XILINX_MCDMA_CHAN_CDESC_OFFSET
(chan->tdest)),
dma_ctrl_read(chan, XILINX_MCDMA_CHAN_TDESC_OFFSET
(chan->tdest)));
chan->err = true;
}
if (status & XILINX_MCDMA_IRQ_DELAY_MASK) {
/*
* Device takes too long to do the transfer when user requires
* responsiveness.
*/
dev_dbg(chan->dev, "Inter-packet latency too long\n");
}
if (status & XILINX_MCDMA_IRQ_IOC_MASK) {
spin_lock(&chan->lock);
xilinx_dma_complete_descriptor(chan);
chan->idle = true;
chan->start_transfer(chan);
spin_unlock(&chan->lock);
}
tasklet_hi_schedule(&chan->tasklet);
return IRQ_HANDLED;
}
/**
* xilinx_dma_irq_handler - DMA Interrupt handler
* @irq: IRQ number
* @data: Pointer to the Xilinx DMA channel structure
*
* Return: IRQ_HANDLED/IRQ_NONE
*/
static irqreturn_t xilinx_dma_irq_handler(int irq, void *data)
{
struct xilinx_dma_chan *chan = data;
u32 status;
/* Read the status and ack the interrupts. */
status = dma_ctrl_read(chan, XILINX_DMA_REG_DMASR);
if (!(status & XILINX_DMA_DMAXR_ALL_IRQ_MASK))
return IRQ_NONE;
dma_ctrl_write(chan, XILINX_DMA_REG_DMASR,
status & XILINX_DMA_DMAXR_ALL_IRQ_MASK);
if (status & XILINX_DMA_DMASR_ERR_IRQ) {
/*
* An error occurred. If C_FLUSH_ON_FSYNC is enabled and the
* error is recoverable, ignore it. Otherwise flag the error.
*
* Only recoverable errors can be cleared in the DMASR register,
* make sure not to write to other error bits to 1.
*/
u32 errors = status & XILINX_DMA_DMASR_ALL_ERR_MASK;
dma_ctrl_write(chan, XILINX_DMA_REG_DMASR,
errors & XILINX_DMA_DMASR_ERR_RECOVER_MASK);
if (!chan->flush_on_fsync ||
(errors & ~XILINX_DMA_DMASR_ERR_RECOVER_MASK)) {
dev_err(chan->dev,
"Channel %p has errors %x, cdr %x tdr %x\n",
chan, errors,
dma_ctrl_read(chan, XILINX_DMA_REG_CURDESC),
dma_ctrl_read(chan, XILINX_DMA_REG_TAILDESC));
chan->err = true;
}
}
if (status & (XILINX_DMA_DMASR_FRM_CNT_IRQ |
XILINX_DMA_DMASR_DLY_CNT_IRQ)) {
spin_lock(&chan->lock);
xilinx_dma_complete_descriptor(chan);
chan->idle = true;
chan->start_transfer(chan);
spin_unlock(&chan->lock);
}
tasklet_schedule(&chan->tasklet);
return IRQ_HANDLED;
}
/**
* append_desc_queue - Queuing descriptor
* @chan: Driver specific dma channel
* @desc: dma transaction descriptor
*/
static void append_desc_queue(struct xilinx_dma_chan *chan,
struct xilinx_dma_tx_descriptor *desc)
{
struct xilinx_vdma_tx_segment *tail_segment;
struct xilinx_dma_tx_descriptor *tail_desc;
struct xilinx_axidma_tx_segment *axidma_tail_segment;
struct xilinx_aximcdma_tx_segment *aximcdma_tail_segment;
struct xilinx_cdma_tx_segment *cdma_tail_segment;
if (list_empty(&chan->pending_list))
goto append;
/*
* Add the hardware descriptor to the chain of hardware descriptors
* that already exists in memory.
*/
tail_desc = list_last_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_vdma_tx_segment,
node);
tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
} else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
cdma_tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_cdma_tx_segment,
node);
cdma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
} else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
axidma_tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_axidma_tx_segment,
node);
axidma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
} else {
aximcdma_tail_segment =
list_last_entry(&tail_desc->segments,
struct xilinx_aximcdma_tx_segment,
node);
aximcdma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
}
/*
* Add the software descriptor and all children to the list
* of pending transactions
*/
append:
list_add_tail(&desc->node, &chan->pending_list);
chan->desc_pendingcount++;
if (chan->has_sg && (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA)
&& unlikely(chan->desc_pendingcount > chan->num_frms)) {
dev_dbg(chan->dev, "desc pendingcount is too high\n");
chan->desc_pendingcount = chan->num_frms;
}
}
/**
* xilinx_dma_tx_submit - Submit DMA transaction
* @tx: Async transaction descriptor
*
* Return: cookie value on success and failure value on error
*/
static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct xilinx_dma_tx_descriptor *desc = to_dma_tx_descriptor(tx);
struct xilinx_dma_chan *chan = to_xilinx_chan(tx->chan);
dma_cookie_t cookie;
unsigned long flags;
int err;
if (chan->cyclic) {
xilinx_dma_free_tx_descriptor(chan, desc);
return -EBUSY;
}
if (chan->err) {
/*
* If reset fails, need to hard reset the system.
* Channel is no longer functional
*/
err = xilinx_dma_chan_reset(chan);
if (err < 0)
return err;
}
spin_lock_irqsave(&chan->lock, flags);
cookie = dma_cookie_assign(tx);
/* Put this transaction onto the tail of the pending queue */
append_desc_queue(chan, desc);
if (desc->cyclic)
chan->cyclic = true;
chan->terminating = false;
spin_unlock_irqrestore(&chan->lock, flags);
return cookie;
}
/**
* xilinx_vdma_dma_prep_interleaved - prepare a descriptor for a
* DMA_SLAVE transaction
* @dchan: DMA channel
* @xt: Interleaved template pointer
* @flags: transfer ack flags
*
* Return: Async transaction descriptor on success and NULL on failure
*/
static struct dma_async_tx_descriptor *
xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan,
struct dma_interleaved_template *xt,
unsigned long flags)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dma_tx_descriptor *desc;
struct xilinx_vdma_tx_segment *segment;
struct xilinx_vdma_desc_hw *hw;
if (!is_slave_direction(xt->dir))
return NULL;
if (!xt->numf || !xt->sgl[0].size)
return NULL;
if (xt->frame_size != 1)
return NULL;
/* Allocate a transaction descriptor. */
desc = xilinx_dma_alloc_tx_descriptor(chan);
if (!desc)
return NULL;
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
desc->async_tx.tx_submit = xilinx_dma_tx_submit;
async_tx_ack(&desc->async_tx);
/* Allocate the link descriptor from DMA pool */
segment = xilinx_vdma_alloc_tx_segment(chan);
if (!segment)
goto error;
/* Fill in the hardware descriptor */
hw = &segment->hw;
hw->vsize = xt->numf;
hw->hsize = xt->sgl[0].size;
hw->stride = (xt->sgl[0].icg + xt->sgl[0].size) <<
XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT;
hw->stride |= chan->config.frm_dly <<
XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT;
if (xt->dir != DMA_MEM_TO_DEV) {
if (chan->ext_addr) {
hw->buf_addr = lower_32_bits(xt->dst_start);
hw->buf_addr_msb = upper_32_bits(xt->dst_start);
} else {
hw->buf_addr = xt->dst_start;
}
} else {
if (chan->ext_addr) {
hw->buf_addr = lower_32_bits(xt->src_start);
hw->buf_addr_msb = upper_32_bits(xt->src_start);
} else {
hw->buf_addr = xt->src_start;
}
}
/* Insert the segment into the descriptor segments list. */
list_add_tail(&segment->node, &desc->segments);
/* Link the last hardware descriptor with the first. */
segment = list_first_entry(&desc->segments,
struct xilinx_vdma_tx_segment, node);
desc->async_tx.phys = segment->phys;
return &desc->async_tx;
error:
xilinx_dma_free_tx_descriptor(chan, desc);
return NULL;
}
/**
* xilinx_cdma_prep_memcpy - prepare descriptors for a memcpy transaction
* @dchan: DMA channel
* @dma_dst: destination address
* @dma_src: source address
* @len: transfer length
* @flags: transfer ack flags
*
* Return: Async transaction descriptor on success and NULL on failure
*/
static struct dma_async_tx_descriptor *
xilinx_cdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst,
dma_addr_t dma_src, size_t len, unsigned long flags)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dma_tx_descriptor *desc;
struct xilinx_cdma_tx_segment *segment;
struct xilinx_cdma_desc_hw *hw;
if (!len || len > chan->xdev->max_buffer_len)
return NULL;
desc = xilinx_dma_alloc_tx_descriptor(chan);
if (!desc)
return NULL;
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
desc->async_tx.tx_submit = xilinx_dma_tx_submit;
/* Allocate the link descriptor from DMA pool */
segment = xilinx_cdma_alloc_tx_segment(chan);
if (!segment)
goto error;
hw = &segment->hw;
hw->control = len;
hw->src_addr = dma_src;
hw->dest_addr = dma_dst;
if (chan->ext_addr) {
hw->src_addr_msb = upper_32_bits(dma_src);
hw->dest_addr_msb = upper_32_bits(dma_dst);
}
/* Insert the segment into the descriptor segments list. */
list_add_tail(&segment->node, &desc->segments);
desc->async_tx.phys = segment->phys;
hw->next_desc = segment->phys;
return &desc->async_tx;
error:
xilinx_dma_free_tx_descriptor(chan, desc);
return NULL;
}
/**
* xilinx_dma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
* @dchan: DMA channel
* @sgl: scatterlist to transfer to/from
* @sg_len: number of entries in @scatterlist
* @direction: DMA direction
* @flags: transfer ack flags
* @context: APP words of the descriptor
*
* Return: Async transaction descriptor on success and NULL on failure
*/
static struct dma_async_tx_descriptor *xilinx_dma_prep_slave_sg(
struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long flags,
void *context)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dma_tx_descriptor *desc;
struct xilinx_axidma_tx_segment *segment = NULL;
u32 *app_w = (u32 *)context;
struct scatterlist *sg;
size_t copy;
size_t sg_used;
unsigned int i;
if (!is_slave_direction(direction))
return NULL;
/* Allocate a transaction descriptor. */
desc = xilinx_dma_alloc_tx_descriptor(chan);
if (!desc)
return NULL;
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
desc->async_tx.tx_submit = xilinx_dma_tx_submit;
/* Build transactions using information in the scatter gather list */
for_each_sg(sgl, sg, sg_len, i) {
sg_used = 0;
/* Loop until the entire scatterlist entry is used */
while (sg_used < sg_dma_len(sg)) {
struct xilinx_axidma_desc_hw *hw;
/* Get a free segment */
segment = xilinx_axidma_alloc_tx_segment(chan);
if (!segment)
goto error;
/*
* Calculate the maximum number of bytes to transfer,
* making sure it is less than the hw limit
*/
copy = xilinx_dma_calc_copysize(chan, sg_dma_len(sg),
sg_used);
hw = &segment->hw;
/* Fill in the descriptor */
xilinx_axidma_buf(chan, hw, sg_dma_address(sg),
sg_used, 0);
hw->control = copy;
if (chan->direction == DMA_MEM_TO_DEV) {
if (app_w)
memcpy(hw->app, app_w, sizeof(u32) *
XILINX_DMA_NUM_APP_WORDS);
}
sg_used += copy;
/*
* Insert the segment into the descriptor segments
* list.
*/
list_add_tail(&segment->node, &desc->segments);
}
}
segment = list_first_entry(&desc->segments,
struct xilinx_axidma_tx_segment, node);
desc->async_tx.phys = segment->phys;
/* For the last DMA_MEM_TO_DEV transfer, set EOP */
if (chan->direction == DMA_MEM_TO_DEV) {
segment->hw.control |= XILINX_DMA_BD_SOP;
segment = list_last_entry(&desc->segments,
struct xilinx_axidma_tx_segment,
node);
segment->hw.control |= XILINX_DMA_BD_EOP;
}
if (chan->xdev->has_axistream_connected)
desc->async_tx.metadata_ops = &xilinx_dma_metadata_ops;
return &desc->async_tx;
error:
xilinx_dma_free_tx_descriptor(chan, desc);
return NULL;
}
/**
* xilinx_dma_prep_dma_cyclic - prepare descriptors for a DMA_SLAVE transaction
* @dchan: DMA channel
* @buf_addr: Physical address of the buffer
* @buf_len: Total length of the cyclic buffers
* @period_len: length of individual cyclic buffer
* @direction: DMA direction
* @flags: transfer ack flags
*
* Return: Async transaction descriptor on success and NULL on failure
*/
static struct dma_async_tx_descriptor *xilinx_dma_prep_dma_cyclic(
struct dma_chan *dchan, dma_addr_t buf_addr, size_t buf_len,
size_t period_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dma_tx_descriptor *desc;
struct xilinx_axidma_tx_segment *segment, *head_segment, *prev = NULL;
size_t copy, sg_used;
unsigned int num_periods;
int i;
u32 reg;
if (!period_len)
return NULL;
num_periods = buf_len / period_len;
if (!num_periods)
return NULL;
if (!is_slave_direction(direction))
return NULL;
/* Allocate a transaction descriptor. */
desc = xilinx_dma_alloc_tx_descriptor(chan);
if (!desc)
return NULL;
chan->direction = direction;
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
desc->async_tx.tx_submit = xilinx_dma_tx_submit;
for (i = 0; i < num_periods; ++i) {
sg_used = 0;
while (sg_used < period_len) {
struct xilinx_axidma_desc_hw *hw;
/* Get a free segment */
segment = xilinx_axidma_alloc_tx_segment(chan);
if (!segment)
goto error;
/*
* Calculate the maximum number of bytes to transfer,
* making sure it is less than the hw limit
*/
copy = xilinx_dma_calc_copysize(chan, period_len,
sg_used);
hw = &segment->hw;
xilinx_axidma_buf(chan, hw, buf_addr, sg_used,
period_len * i);
hw->control = copy;
if (prev)
prev->hw.next_desc = segment->phys;
prev = segment;
sg_used += copy;
/*
* Insert the segment into the descriptor segments
* list.
*/
list_add_tail(&segment->node, &desc->segments);
}
}
head_segment = list_first_entry(&desc->segments,
struct xilinx_axidma_tx_segment, node);
desc->async_tx.phys = head_segment->phys;
desc->cyclic = true;
reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
reg |= XILINX_DMA_CR_CYCLIC_BD_EN_MASK;
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
segment = list_last_entry(&desc->segments,
struct xilinx_axidma_tx_segment,
node);
segment->hw.next_desc = (u32) head_segment->phys;
/* For the last DMA_MEM_TO_DEV transfer, set EOP */
if (direction == DMA_MEM_TO_DEV) {
head_segment->hw.control |= XILINX_DMA_BD_SOP;
segment->hw.control |= XILINX_DMA_BD_EOP;
}
return &desc->async_tx;
error:
xilinx_dma_free_tx_descriptor(chan, desc);
return NULL;
}
/**
* xilinx_mcdma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
* @dchan: DMA channel
* @sgl: scatterlist to transfer to/from
* @sg_len: number of entries in @scatterlist
* @direction: DMA direction
* @flags: transfer ack flags
* @context: APP words of the descriptor
*
* Return: Async transaction descriptor on success and NULL on failure
*/
static struct dma_async_tx_descriptor *
xilinx_mcdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dma_tx_descriptor *desc;
struct xilinx_aximcdma_tx_segment *segment = NULL;
u32 *app_w = (u32 *)context;
struct scatterlist *sg;
size_t copy;
size_t sg_used;
unsigned int i;
if (!is_slave_direction(direction))
return NULL;
/* Allocate a transaction descriptor. */
desc = xilinx_dma_alloc_tx_descriptor(chan);
if (!desc)
return NULL;
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
desc->async_tx.tx_submit = xilinx_dma_tx_submit;
/* Build transactions using information in the scatter gather list */
for_each_sg(sgl, sg, sg_len, i) {
sg_used = 0;
/* Loop until the entire scatterlist entry is used */
while (sg_used < sg_dma_len(sg)) {
struct xilinx_aximcdma_desc_hw *hw;
/* Get a free segment */
segment = xilinx_aximcdma_alloc_tx_segment(chan);
if (!segment)
goto error;
/*
* Calculate the maximum number of bytes to transfer,
* making sure it is less than the hw limit
*/
copy = min_t(size_t, sg_dma_len(sg) - sg_used,
chan->xdev->max_buffer_len);
hw = &segment->hw;
/* Fill in the descriptor */
xilinx_aximcdma_buf(chan, hw, sg_dma_address(sg),
sg_used);
hw->control = copy;
if (chan->direction == DMA_MEM_TO_DEV && app_w) {
memcpy(hw->app, app_w, sizeof(u32) *
XILINX_DMA_NUM_APP_WORDS);
}
sg_used += copy;
/*
* Insert the segment into the descriptor segments
* list.
*/
list_add_tail(&segment->node, &desc->segments);
}
}
segment = list_first_entry(&desc->segments,
struct xilinx_aximcdma_tx_segment, node);
desc->async_tx.phys = segment->phys;
/* For the last DMA_MEM_TO_DEV transfer, set EOP */
if (chan->direction == DMA_MEM_TO_DEV) {
segment->hw.control |= XILINX_MCDMA_BD_SOP;
segment = list_last_entry(&desc->segments,
struct xilinx_aximcdma_tx_segment,
node);
segment->hw.control |= XILINX_MCDMA_BD_EOP;
}
return &desc->async_tx;
error:
xilinx_dma_free_tx_descriptor(chan, desc);
return NULL;
}
/**
* xilinx_dma_terminate_all - Halt the channel and free descriptors
* @dchan: Driver specific DMA Channel pointer
*
* Return: '0' always.
*/
static int xilinx_dma_terminate_all(struct dma_chan *dchan)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
u32 reg;
int err;
if (!chan->cyclic) {
err = chan->stop_transfer(chan);
if (err) {
dev_err(chan->dev, "Cannot stop channel %p: %x\n",
chan, dma_ctrl_read(chan,
XILINX_DMA_REG_DMASR));
chan->err = true;
}
}
xilinx_dma_chan_reset(chan);
/* Remove and free all of the descriptors in the lists */
chan->terminating = true;
xilinx_dma_free_descriptors(chan);
chan->idle = true;
if (chan->cyclic) {
reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
reg &= ~XILINX_DMA_CR_CYCLIC_BD_EN_MASK;
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
chan->cyclic = false;
}
if ((chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) && chan->has_sg)
dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR,
XILINX_CDMA_CR_SGMODE);
return 0;
}
static void xilinx_dma_synchronize(struct dma_chan *dchan)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
tasklet_kill(&chan->tasklet);
}
/**
* xilinx_vdma_channel_set_config - Configure VDMA channel
* Run-time configuration for Axi VDMA, supports:
* . halt the channel
* . configure interrupt coalescing and inter-packet delay threshold
* . start/stop parking
* . enable genlock
*
* @dchan: DMA channel
* @cfg: VDMA device configuration pointer
*
* Return: '0' on success and failure value on error
*/
int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
struct xilinx_vdma_config *cfg)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
u32 dmacr;
if (cfg->reset)
return xilinx_dma_chan_reset(chan);
dmacr = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
chan->config.frm_dly = cfg->frm_dly;
chan->config.park = cfg->park;
/* genlock settings */
chan->config.gen_lock = cfg->gen_lock;
chan->config.master = cfg->master;
dmacr &= ~XILINX_DMA_DMACR_GENLOCK_EN;
if (cfg->gen_lock && chan->genlock) {
dmacr |= XILINX_DMA_DMACR_GENLOCK_EN;
dmacr &= ~XILINX_DMA_DMACR_MASTER_MASK;
dmacr |= cfg->master << XILINX_DMA_DMACR_MASTER_SHIFT;
}
chan->config.frm_cnt_en = cfg->frm_cnt_en;
chan->config.vflip_en = cfg->vflip_en;
if (cfg->park)
chan->config.park_frm = cfg->park_frm;
else
chan->config.park_frm = -1;
chan->config.coalesc = cfg->coalesc;
chan->config.delay = cfg->delay;
if (cfg->coalesc <= XILINX_DMA_DMACR_FRAME_COUNT_MAX) {
dmacr &= ~XILINX_DMA_DMACR_FRAME_COUNT_MASK;
dmacr |= cfg->coalesc << XILINX_DMA_DMACR_FRAME_COUNT_SHIFT;
chan->config.coalesc = cfg->coalesc;
}
if (cfg->delay <= XILINX_DMA_DMACR_DELAY_MAX) {
dmacr &= ~XILINX_DMA_DMACR_DELAY_MASK;
dmacr |= cfg->delay << XILINX_DMA_DMACR_DELAY_SHIFT;
chan->config.delay = cfg->delay;
}
/* FSync Source selection */
dmacr &= ~XILINX_DMA_DMACR_FSYNCSRC_MASK;
dmacr |= cfg->ext_fsync << XILINX_DMA_DMACR_FSYNCSRC_SHIFT;
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, dmacr);
return 0;
}
EXPORT_SYMBOL(xilinx_vdma_channel_set_config);
/* -----------------------------------------------------------------------------
* Probe and remove
*/
/**
* xilinx_dma_chan_remove - Per Channel remove function
* @chan: Driver specific DMA channel
*/
static void xilinx_dma_chan_remove(struct xilinx_dma_chan *chan)
{
/* Disable all interrupts */
dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR,
XILINX_DMA_DMAXR_ALL_IRQ_MASK);
if (chan->irq > 0)
free_irq(chan->irq, chan);
tasklet_kill(&chan->tasklet);
list_del(&chan->common.device_node);
}
static int axidma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
struct clk **tx_clk, struct clk **rx_clk,
struct clk **sg_clk, struct clk **tmp_clk)
{
int err;
*tmp_clk = NULL;
*axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
if (IS_ERR(*axi_clk))
return dev_err_probe(&pdev->dev, PTR_ERR(*axi_clk), "failed to get axi_aclk\n");
*tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk");
if (IS_ERR(*tx_clk))
*tx_clk = NULL;
*rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk");
if (IS_ERR(*rx_clk))
*rx_clk = NULL;
*sg_clk = devm_clk_get(&pdev->dev, "m_axi_sg_aclk");
if (IS_ERR(*sg_clk))
*sg_clk = NULL;
err = clk_prepare_enable(*axi_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", err);
return err;
}
err = clk_prepare_enable(*tx_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable tx_clk (%d)\n", err);
goto err_disable_axiclk;
}
err = clk_prepare_enable(*rx_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable rx_clk (%d)\n", err);
goto err_disable_txclk;
}
err = clk_prepare_enable(*sg_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable sg_clk (%d)\n", err);
goto err_disable_rxclk;
}
return 0;
err_disable_rxclk:
clk_disable_unprepare(*rx_clk);
err_disable_txclk:
clk_disable_unprepare(*tx_clk);
err_disable_axiclk:
clk_disable_unprepare(*axi_clk);
return err;
}
static int axicdma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
struct clk **dev_clk, struct clk **tmp_clk,
struct clk **tmp1_clk, struct clk **tmp2_clk)
{
int err;
*tmp_clk = NULL;
*tmp1_clk = NULL;
*tmp2_clk = NULL;
*axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
if (IS_ERR(*axi_clk))
return dev_err_probe(&pdev->dev, PTR_ERR(*axi_clk), "failed to get axi_aclk\n");
*dev_clk = devm_clk_get(&pdev->dev, "m_axi_aclk");
if (IS_ERR(*dev_clk))
return dev_err_probe(&pdev->dev, PTR_ERR(*dev_clk), "failed to get dev_clk\n");
err = clk_prepare_enable(*axi_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", err);
return err;
}
err = clk_prepare_enable(*dev_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable dev_clk (%d)\n", err);
goto err_disable_axiclk;
}
return 0;
err_disable_axiclk:
clk_disable_unprepare(*axi_clk);
return err;
}
static int axivdma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
struct clk **tx_clk, struct clk **txs_clk,
struct clk **rx_clk, struct clk **rxs_clk)
{
int err;
*axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
if (IS_ERR(*axi_clk))
return dev_err_probe(&pdev->dev, PTR_ERR(*axi_clk), "failed to get axi_aclk\n");
*tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk");
if (IS_ERR(*tx_clk))
*tx_clk = NULL;
*txs_clk = devm_clk_get(&pdev->dev, "m_axis_mm2s_aclk");
if (IS_ERR(*txs_clk))
*txs_clk = NULL;
*rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk");
if (IS_ERR(*rx_clk))
*rx_clk = NULL;
*rxs_clk = devm_clk_get(&pdev->dev, "s_axis_s2mm_aclk");
if (IS_ERR(*rxs_clk))
*rxs_clk = NULL;
err = clk_prepare_enable(*axi_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n",
err);
return err;
}
err = clk_prepare_enable(*tx_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable tx_clk (%d)\n", err);
goto err_disable_axiclk;
}
err = clk_prepare_enable(*txs_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable txs_clk (%d)\n", err);
goto err_disable_txclk;
}
err = clk_prepare_enable(*rx_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable rx_clk (%d)\n", err);
goto err_disable_txsclk;
}
err = clk_prepare_enable(*rxs_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable rxs_clk (%d)\n", err);
goto err_disable_rxclk;
}
return 0;
err_disable_rxclk:
clk_disable_unprepare(*rx_clk);
err_disable_txsclk:
clk_disable_unprepare(*txs_clk);
err_disable_txclk:
clk_disable_unprepare(*tx_clk);
err_disable_axiclk:
clk_disable_unprepare(*axi_clk);
return err;
}
static void xdma_disable_allclks(struct xilinx_dma_device *xdev)
{
clk_disable_unprepare(xdev->rxs_clk);
clk_disable_unprepare(xdev->rx_clk);
clk_disable_unprepare(xdev->txs_clk);
clk_disable_unprepare(xdev->tx_clk);
clk_disable_unprepare(xdev->axi_clk);
}
/**
* xilinx_dma_chan_probe - Per Channel Probing
* It get channel features from the device tree entry and
* initialize special channel handling routines
*
* @xdev: Driver specific device structure
* @node: Device node
*
* Return: '0' on success and failure value on error
*/
static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
struct device_node *node)
{
struct xilinx_dma_chan *chan;
bool has_dre = false;
u32 value, width;
int err;
/* Allocate and initialize the channel structure */
chan = devm_kzalloc(xdev->dev, sizeof(*chan), GFP_KERNEL);
if (!chan)
return -ENOMEM;
chan->dev = xdev->dev;
chan->xdev = xdev;
chan->desc_pendingcount = 0x0;
chan->ext_addr = xdev->ext_addr;
/* This variable ensures that descriptors are not
* Submitted when dma engine is in progress. This variable is
* Added to avoid polling for a bit in the status register to
* Know dma state in the driver hot path.
*/
chan->idle = true;
spin_lock_init(&chan->lock);
INIT_LIST_HEAD(&chan->pending_list);
INIT_LIST_HEAD(&chan->done_list);
INIT_LIST_HEAD(&chan->active_list);
INIT_LIST_HEAD(&chan->free_seg_list);
/* Retrieve the channel properties from the device tree */
has_dre = of_property_read_bool(node, "xlnx,include-dre");
of_property_read_u8(node, "xlnx,irq-delay", &chan->irq_delay);
chan->genlock = of_property_read_bool(node, "xlnx,genlock-mode");
err = of_property_read_u32(node, "xlnx,datawidth", &value);
if (err) {
dev_err(xdev->dev, "missing xlnx,datawidth property\n");
return err;
}
width = value >> 3; /* Convert bits to bytes */
/* If data width is greater than 8 bytes, DRE is not in hw */
if (width > 8)
has_dre = false;
if (!has_dre)
xdev->common.copy_align = (enum dmaengine_alignment)fls(width - 1);
if (of_device_is_compatible(node, "xlnx,axi-vdma-mm2s-channel") ||
of_device_is_compatible(node, "xlnx,axi-dma-mm2s-channel") ||
of_device_is_compatible(node, "xlnx,axi-cdma-channel")) {
chan->direction = DMA_MEM_TO_DEV;
chan->id = xdev->mm2s_chan_id++;
chan->tdest = chan->id;
chan->ctrl_offset = XILINX_DMA_MM2S_CTRL_OFFSET;
if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET;
chan->config.park = 1;
if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
xdev->flush_on_fsync == XILINX_DMA_FLUSH_MM2S)
chan->flush_on_fsync = true;
}
} else if (of_device_is_compatible(node,
"xlnx,axi-vdma-s2mm-channel") ||
of_device_is_compatible(node,
"xlnx,axi-dma-s2mm-channel")) {
chan->direction = DMA_DEV_TO_MEM;
chan->id = xdev->s2mm_chan_id++;
chan->tdest = chan->id - xdev->dma_config->max_channels / 2;
chan->has_vflip = of_property_read_bool(node,
"xlnx,enable-vert-flip");
if (chan->has_vflip) {
chan->config.vflip_en = dma_read(chan,
XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP) &
XILINX_VDMA_ENABLE_VERTICAL_FLIP;
}
if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA)
chan->ctrl_offset = XILINX_MCDMA_S2MM_CTRL_OFFSET;
else
chan->ctrl_offset = XILINX_DMA_S2MM_CTRL_OFFSET;
if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET;
chan->config.park = 1;
if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
xdev->flush_on_fsync == XILINX_DMA_FLUSH_S2MM)
chan->flush_on_fsync = true;
}
} else {
dev_err(xdev->dev, "Invalid channel compatible node\n");
return -EINVAL;
}
/* Request the interrupt */
chan->irq = of_irq_get(node, chan->tdest);
if (chan->irq < 0)
return dev_err_probe(xdev->dev, chan->irq, "failed to get irq\n");
err = request_irq(chan->irq, xdev->dma_config->irq_handler,
IRQF_SHARED, "xilinx-dma-controller", chan);
if (err) {
dev_err(xdev->dev, "unable to request IRQ %d\n", chan->irq);
return err;
}
if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
chan->start_transfer = xilinx_dma_start_transfer;
chan->stop_transfer = xilinx_dma_stop_transfer;
} else if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
chan->start_transfer = xilinx_mcdma_start_transfer;
chan->stop_transfer = xilinx_dma_stop_transfer;
} else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
chan->start_transfer = xilinx_cdma_start_transfer;
chan->stop_transfer = xilinx_cdma_stop_transfer;
} else {
chan->start_transfer = xilinx_vdma_start_transfer;
chan->stop_transfer = xilinx_dma_stop_transfer;
}
/* check if SG is enabled (only for AXIDMA, AXIMCDMA, and CDMA) */
if (xdev->dma_config->dmatype != XDMA_TYPE_VDMA) {
if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA ||
dma_ctrl_read(chan, XILINX_DMA_REG_DMASR) &
XILINX_DMA_DMASR_SG_MASK)
chan->has_sg = true;
dev_dbg(chan->dev, "ch %d: SG %s\n", chan->id,
chan->has_sg ? "enabled" : "disabled");
}
/* Initialize the tasklet */
tasklet_setup(&chan->tasklet, xilinx_dma_do_tasklet);
/*
* Initialize the DMA channel and add it to the DMA engine channels
* list.
*/
chan->common.device = &xdev->common;
list_add_tail(&chan->common.device_node, &xdev->common.channels);
xdev->chan[chan->id] = chan;
/* Reset the channel */
err = xilinx_dma_chan_reset(chan);
if (err < 0) {
dev_err(xdev->dev, "Reset channel failed\n");
return err;
}
return 0;
}
/**
* xilinx_dma_child_probe - Per child node probe
* It get number of dma-channels per child node from
* device-tree and initializes all the channels.
*
* @xdev: Driver specific device structure
* @node: Device node
*
* Return: '0' on success and failure value on error.
*/
static int xilinx_dma_child_probe(struct xilinx_dma_device *xdev,
struct device_node *node)
{
int ret, i;
u32 nr_channels = 1;
ret = of_property_read_u32(node, "dma-channels", &nr_channels);
if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA && ret < 0)
dev_warn(xdev->dev, "missing dma-channels property\n");
for (i = 0; i < nr_channels; i++) {
ret = xilinx_dma_chan_probe(xdev, node);
if (ret)
return ret;
}
return 0;
}
/**
* of_dma_xilinx_xlate - Translation function
* @dma_spec: Pointer to DMA specifier as found in the device tree
* @ofdma: Pointer to DMA controller data
*
* Return: DMA channel pointer on success and NULL on error
*/
static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct xilinx_dma_device *xdev = ofdma->of_dma_data;
int chan_id = dma_spec->args[0];
if (chan_id >= xdev->dma_config->max_channels || !xdev->chan[chan_id])
return NULL;
return dma_get_slave_channel(&xdev->chan[chan_id]->common);
}
static const struct xilinx_dma_config axidma_config = {
.dmatype = XDMA_TYPE_AXIDMA,
.clk_init = axidma_clk_init,
.irq_handler = xilinx_dma_irq_handler,
.max_channels = XILINX_DMA_MAX_CHANS_PER_DEVICE,
};
static const struct xilinx_dma_config aximcdma_config = {
.dmatype = XDMA_TYPE_AXIMCDMA,
.clk_init = axidma_clk_init,
.irq_handler = xilinx_mcdma_irq_handler,
.max_channels = XILINX_MCDMA_MAX_CHANS_PER_DEVICE,
};
static const struct xilinx_dma_config axicdma_config = {
.dmatype = XDMA_TYPE_CDMA,
.clk_init = axicdma_clk_init,
.irq_handler = xilinx_dma_irq_handler,
.max_channels = XILINX_CDMA_MAX_CHANS_PER_DEVICE,
};
static const struct xilinx_dma_config axivdma_config = {
.dmatype = XDMA_TYPE_VDMA,
.clk_init = axivdma_clk_init,
.irq_handler = xilinx_dma_irq_handler,
.max_channels = XILINX_DMA_MAX_CHANS_PER_DEVICE,
};
static const struct of_device_id xilinx_dma_of_ids[] = {
{ .compatible = "xlnx,axi-dma-1.00.a", .data = &axidma_config },
{ .compatible = "xlnx,axi-cdma-1.00.a", .data = &axicdma_config },
{ .compatible = "xlnx,axi-vdma-1.00.a", .data = &axivdma_config },
{ .compatible = "xlnx,axi-mcdma-1.00.a", .data = &aximcdma_config },
{}
};
MODULE_DEVICE_TABLE(of, xilinx_dma_of_ids);
/**
* xilinx_dma_probe - Driver probe function
* @pdev: Pointer to the platform_device structure
*
* Return: '0' on success and failure value on error
*/
static int xilinx_dma_probe(struct platform_device *pdev)
{
int (*clk_init)(struct platform_device *, struct clk **, struct clk **,
struct clk **, struct clk **, struct clk **)
= axivdma_clk_init;
struct device_node *node = pdev->dev.of_node;
struct xilinx_dma_device *xdev;
struct device_node *child, *np = pdev->dev.of_node;
u32 num_frames, addr_width, len_width;
int i, err;
/* Allocate and initialize the DMA engine structure */
xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
if (!xdev)
return -ENOMEM;
xdev->dev = &pdev->dev;
if (np) {
const struct of_device_id *match;
match = of_match_node(xilinx_dma_of_ids, np);
if (match && match->data) {
xdev->dma_config = match->data;
clk_init = xdev->dma_config->clk_init;
}
}
err = clk_init(pdev, &xdev->axi_clk, &xdev->tx_clk, &xdev->txs_clk,
&xdev->rx_clk, &xdev->rxs_clk);
if (err)
return err;
/* Request and map I/O memory */
xdev->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(xdev->regs)) {
err = PTR_ERR(xdev->regs);
goto disable_clks;
}
/* Retrieve the DMA engine properties from the device tree */
xdev->max_buffer_len = GENMASK(XILINX_DMA_MAX_TRANS_LEN_MAX - 1, 0);
xdev->s2mm_chan_id = xdev->dma_config->max_channels / 2;
if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA ||
xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
if (!of_property_read_u32(node, "xlnx,sg-length-width",
&len_width)) {
if (len_width < XILINX_DMA_MAX_TRANS_LEN_MIN ||
len_width > XILINX_DMA_V2_MAX_TRANS_LEN_MAX) {
dev_warn(xdev->dev,
"invalid xlnx,sg-length-width property value. Using default width\n");
} else {
if (len_width > XILINX_DMA_MAX_TRANS_LEN_MAX)
dev_warn(xdev->dev, "Please ensure that IP supports buffer length > 23 bits\n");
xdev->max_buffer_len =
GENMASK(len_width - 1, 0);
}
}
}
if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
xdev->has_axistream_connected =
of_property_read_bool(node, "xlnx,axistream-connected");
}
if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
err = of_property_read_u32(node, "xlnx,num-fstores",
&num_frames);
if (err < 0) {
dev_err(xdev->dev,
"missing xlnx,num-fstores property\n");
goto disable_clks;
}
err = of_property_read_u32(node, "xlnx,flush-fsync",
&xdev->flush_on_fsync);
if (err < 0)
dev_warn(xdev->dev,
"missing xlnx,flush-fsync property\n");
}
err = of_property_read_u32(node, "xlnx,addrwidth", &addr_width);
if (err < 0)
dev_warn(xdev->dev, "missing xlnx,addrwidth property\n");
if (addr_width > 32)
xdev->ext_addr = true;
else
xdev->ext_addr = false;
/* Set metadata mode */
if (xdev->has_axistream_connected)
xdev->common.desc_metadata_modes = DESC_METADATA_ENGINE;
/* Set the dma mask bits */
err = dma_set_mask_and_coherent(xdev->dev, DMA_BIT_MASK(addr_width));
if (err < 0) {
dev_err(xdev->dev, "DMA mask error %d\n", err);
goto disable_clks;
}
/* Initialize the DMA engine */
xdev->common.dev = &pdev->dev;
INIT_LIST_HEAD(&xdev->common.channels);
if (!(xdev->dma_config->dmatype == XDMA_TYPE_CDMA)) {
dma_cap_set(DMA_SLAVE, xdev->common.cap_mask);
dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
}
xdev->common.device_alloc_chan_resources =
xilinx_dma_alloc_chan_resources;
xdev->common.device_free_chan_resources =
xilinx_dma_free_chan_resources;
xdev->common.device_terminate_all = xilinx_dma_terminate_all;
xdev->common.device_synchronize = xilinx_dma_synchronize;
xdev->common.device_tx_status = xilinx_dma_tx_status;
xdev->common.device_issue_pending = xilinx_dma_issue_pending;
xdev->common.device_config = xilinx_dma_device_config;
if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
dma_cap_set(DMA_CYCLIC, xdev->common.cap_mask);
xdev->common.device_prep_slave_sg = xilinx_dma_prep_slave_sg;
xdev->common.device_prep_dma_cyclic =
xilinx_dma_prep_dma_cyclic;
/* Residue calculation is supported by only AXI DMA and CDMA */
xdev->common.residue_granularity =
DMA_RESIDUE_GRANULARITY_SEGMENT;
} else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
dma_cap_set(DMA_MEMCPY, xdev->common.cap_mask);
xdev->common.device_prep_dma_memcpy = xilinx_cdma_prep_memcpy;
/* Residue calculation is supported by only AXI DMA and CDMA */
xdev->common.residue_granularity =
DMA_RESIDUE_GRANULARITY_SEGMENT;
} else if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) {
xdev->common.device_prep_slave_sg = xilinx_mcdma_prep_slave_sg;
} else {
xdev->common.device_prep_interleaved_dma =
xilinx_vdma_dma_prep_interleaved;
}
platform_set_drvdata(pdev, xdev);
/* Initialize the channels */
for_each_child_of_node(node, child) {
err = xilinx_dma_child_probe(xdev, child);
if (err < 0) {
of_node_put(child);
goto error;
}
}
if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
for (i = 0; i < xdev->dma_config->max_channels; i++)
if (xdev->chan[i])
xdev->chan[i]->num_frms = num_frames;
}
/* Register the DMA engine with the core */
err = dma_async_device_register(&xdev->common);
if (err) {
dev_err(xdev->dev, "failed to register the dma device\n");
goto error;
}
err = of_dma_controller_register(node, of_dma_xilinx_xlate,
xdev);
if (err < 0) {
dev_err(&pdev->dev, "Unable to register DMA to DT\n");
dma_async_device_unregister(&xdev->common);
goto error;
}
if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
dev_info(&pdev->dev, "Xilinx AXI DMA Engine Driver Probed!!\n");
else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA)
dev_info(&pdev->dev, "Xilinx AXI CDMA Engine Driver Probed!!\n");
else if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA)
dev_info(&pdev->dev, "Xilinx AXI MCDMA Engine Driver Probed!!\n");
else
dev_info(&pdev->dev, "Xilinx AXI VDMA Engine Driver Probed!!\n");
return 0;
error:
for (i = 0; i < xdev->dma_config->max_channels; i++)
if (xdev->chan[i])
xilinx_dma_chan_remove(xdev->chan[i]);
disable_clks:
xdma_disable_allclks(xdev);
return err;
}
/**
* xilinx_dma_remove - Driver remove function
* @pdev: Pointer to the platform_device structure
*
* Return: Always '0'
*/
static int xilinx_dma_remove(struct platform_device *pdev)
{
struct xilinx_dma_device *xdev = platform_get_drvdata(pdev);
int i;
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&xdev->common);
for (i = 0; i < xdev->dma_config->max_channels; i++)
if (xdev->chan[i])
xilinx_dma_chan_remove(xdev->chan[i]);
xdma_disable_allclks(xdev);
return 0;
}
static struct platform_driver xilinx_vdma_driver = {
.driver = {
.name = "xilinx-vdma",
.of_match_table = xilinx_dma_of_ids,
},
.probe = xilinx_dma_probe,
.remove = xilinx_dma_remove,
};
module_platform_driver(xilinx_vdma_driver);
MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("Xilinx VDMA driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/xilinx/xilinx_dma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DMA driver for Xilinx DMA/Bridge Subsystem
*
* Copyright (C) 2017-2020 Xilinx, Inc. All rights reserved.
* Copyright (C) 2022, Advanced Micro Devices, Inc.
*/
/*
* The DMA/Bridge Subsystem for PCI Express allows for the movement of data
* between Host memory and the DMA subsystem. It does this by operating on
* 'descriptors' that contain information about the source, destination and
* amount of data to transfer. These direct memory transfers can be both in
* the Host to Card (H2C) and Card to Host (C2H) transfers. The DMA can be
* configured to have a single AXI4 Master interface shared by all channels
* or one AXI4-Stream interface for each channel enabled. Memory transfers are
* specified on a per-channel basis in descriptor linked lists, which the DMA
* fetches from host memory and processes. Events such as descriptor completion
* and errors are signaled using interrupts. The core also provides up to 16
* user interrupt wires that generate interrupts to the host.
*/
#include <linux/mod_devicetable.h>
#include <linux/bitfield.h>
#include <linux/dmapool.h>
#include <linux/regmap.h>
#include <linux/dmaengine.h>
#include <linux/dma/amd_xdma.h>
#include <linux/platform_device.h>
#include <linux/platform_data/amd_xdma.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include "../virt-dma.h"
#include "xdma-regs.h"
/* mmio regmap config for all XDMA registers */
static const struct regmap_config xdma_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = XDMA_REG_SPACE_LEN,
};
/**
* struct xdma_desc_block - Descriptor block
* @virt_addr: Virtual address of block start
* @dma_addr: DMA address of block start
*/
struct xdma_desc_block {
void *virt_addr;
dma_addr_t dma_addr;
};
/**
* struct xdma_chan - Driver specific DMA channel structure
* @vchan: Virtual channel
* @xdev_hdl: Pointer to DMA device structure
* @base: Offset of channel registers
* @desc_pool: Descriptor pool
* @busy: Busy flag of the channel
* @dir: Transferring direction of the channel
* @cfg: Transferring config of the channel
* @irq: IRQ assigned to the channel
*/
struct xdma_chan {
struct virt_dma_chan vchan;
void *xdev_hdl;
u32 base;
struct dma_pool *desc_pool;
bool busy;
enum dma_transfer_direction dir;
struct dma_slave_config cfg;
u32 irq;
};
/**
* struct xdma_desc - DMA desc structure
* @vdesc: Virtual DMA descriptor
* @chan: DMA channel pointer
* @dir: Transferring direction of the request
* @dev_addr: Physical address on DMA device side
* @desc_blocks: Hardware descriptor blocks
* @dblk_num: Number of hardware descriptor blocks
* @desc_num: Number of hardware descriptors
* @completed_desc_num: Completed hardware descriptors
*/
struct xdma_desc {
struct virt_dma_desc vdesc;
struct xdma_chan *chan;
enum dma_transfer_direction dir;
u64 dev_addr;
struct xdma_desc_block *desc_blocks;
u32 dblk_num;
u32 desc_num;
u32 completed_desc_num;
};
#define XDMA_DEV_STATUS_REG_DMA BIT(0)
#define XDMA_DEV_STATUS_INIT_MSIX BIT(1)
/**
* struct xdma_device - DMA device structure
* @pdev: Platform device pointer
* @dma_dev: DMA device structure
* @rmap: MMIO regmap for DMA registers
* @h2c_chans: Host to Card channels
* @c2h_chans: Card to Host channels
* @h2c_chan_num: Number of H2C channels
* @c2h_chan_num: Number of C2H channels
* @irq_start: Start IRQ assigned to device
* @irq_num: Number of IRQ assigned to device
* @status: Initialization status
*/
struct xdma_device {
struct platform_device *pdev;
struct dma_device dma_dev;
struct regmap *rmap;
struct xdma_chan *h2c_chans;
struct xdma_chan *c2h_chans;
u32 h2c_chan_num;
u32 c2h_chan_num;
u32 irq_start;
u32 irq_num;
u32 status;
};
#define xdma_err(xdev, fmt, args...) \
dev_err(&(xdev)->pdev->dev, fmt, ##args)
#define XDMA_CHAN_NUM(_xd) ({ \
typeof(_xd) (xd) = (_xd); \
((xd)->h2c_chan_num + (xd)->c2h_chan_num); })
/* Get the last desc in a desc block */
static inline void *xdma_blk_last_desc(struct xdma_desc_block *block)
{
return block->virt_addr + (XDMA_DESC_ADJACENT - 1) * XDMA_DESC_SIZE;
}
/**
* xdma_link_desc_blocks - Link descriptor blocks for DMA transfer
* @sw_desc: Tx descriptor pointer
*/
static void xdma_link_desc_blocks(struct xdma_desc *sw_desc)
{
struct xdma_desc_block *block;
u32 last_blk_desc, desc_control;
struct xdma_hw_desc *desc;
int i;
desc_control = XDMA_DESC_CONTROL(XDMA_DESC_ADJACENT, 0);
for (i = 1; i < sw_desc->dblk_num; i++) {
block = &sw_desc->desc_blocks[i - 1];
desc = xdma_blk_last_desc(block);
if (!(i & XDMA_DESC_BLOCK_MASK)) {
desc->control = cpu_to_le32(XDMA_DESC_CONTROL_LAST);
continue;
}
desc->control = cpu_to_le32(desc_control);
desc->next_desc = cpu_to_le64(block[1].dma_addr);
}
/* update the last block */
last_blk_desc = (sw_desc->desc_num - 1) & XDMA_DESC_ADJACENT_MASK;
if (((sw_desc->dblk_num - 1) & XDMA_DESC_BLOCK_MASK) > 0) {
block = &sw_desc->desc_blocks[sw_desc->dblk_num - 2];
desc = xdma_blk_last_desc(block);
desc_control = XDMA_DESC_CONTROL(last_blk_desc + 1, 0);
desc->control = cpu_to_le32(desc_control);
}
block = &sw_desc->desc_blocks[sw_desc->dblk_num - 1];
desc = block->virt_addr + last_blk_desc * XDMA_DESC_SIZE;
desc->control = cpu_to_le32(XDMA_DESC_CONTROL_LAST);
}
static inline struct xdma_chan *to_xdma_chan(struct dma_chan *chan)
{
return container_of(chan, struct xdma_chan, vchan.chan);
}
static inline struct xdma_desc *to_xdma_desc(struct virt_dma_desc *vdesc)
{
return container_of(vdesc, struct xdma_desc, vdesc);
}
/**
* xdma_channel_init - Initialize DMA channel registers
* @chan: DMA channel pointer
*/
static int xdma_channel_init(struct xdma_chan *chan)
{
struct xdma_device *xdev = chan->xdev_hdl;
int ret;
ret = regmap_write(xdev->rmap, chan->base + XDMA_CHAN_CONTROL_W1C,
CHAN_CTRL_NON_INCR_ADDR);
if (ret)
return ret;
ret = regmap_write(xdev->rmap, chan->base + XDMA_CHAN_INTR_ENABLE,
CHAN_IM_ALL);
if (ret)
return ret;
return 0;
}
/**
* xdma_free_desc - Free descriptor
* @vdesc: Virtual DMA descriptor
*/
static void xdma_free_desc(struct virt_dma_desc *vdesc)
{
struct xdma_desc *sw_desc;
int i;
sw_desc = to_xdma_desc(vdesc);
for (i = 0; i < sw_desc->dblk_num; i++) {
if (!sw_desc->desc_blocks[i].virt_addr)
break;
dma_pool_free(sw_desc->chan->desc_pool,
sw_desc->desc_blocks[i].virt_addr,
sw_desc->desc_blocks[i].dma_addr);
}
kfree(sw_desc->desc_blocks);
kfree(sw_desc);
}
/**
* xdma_alloc_desc - Allocate descriptor
* @chan: DMA channel pointer
* @desc_num: Number of hardware descriptors
*/
static struct xdma_desc *
xdma_alloc_desc(struct xdma_chan *chan, u32 desc_num)
{
struct xdma_desc *sw_desc;
struct xdma_hw_desc *desc;
dma_addr_t dma_addr;
u32 dblk_num;
void *addr;
int i, j;
sw_desc = kzalloc(sizeof(*sw_desc), GFP_NOWAIT);
if (!sw_desc)
return NULL;
sw_desc->chan = chan;
sw_desc->desc_num = desc_num;
dblk_num = DIV_ROUND_UP(desc_num, XDMA_DESC_ADJACENT);
sw_desc->desc_blocks = kcalloc(dblk_num, sizeof(*sw_desc->desc_blocks),
GFP_NOWAIT);
if (!sw_desc->desc_blocks)
goto failed;
sw_desc->dblk_num = dblk_num;
for (i = 0; i < sw_desc->dblk_num; i++) {
addr = dma_pool_alloc(chan->desc_pool, GFP_NOWAIT, &dma_addr);
if (!addr)
goto failed;
sw_desc->desc_blocks[i].virt_addr = addr;
sw_desc->desc_blocks[i].dma_addr = dma_addr;
for (j = 0, desc = addr; j < XDMA_DESC_ADJACENT; j++)
desc[j].control = cpu_to_le32(XDMA_DESC_CONTROL(1, 0));
}
xdma_link_desc_blocks(sw_desc);
return sw_desc;
failed:
xdma_free_desc(&sw_desc->vdesc);
return NULL;
}
/**
* xdma_xfer_start - Start DMA transfer
* @xchan: DMA channel pointer
*/
static int xdma_xfer_start(struct xdma_chan *xchan)
{
struct virt_dma_desc *vd = vchan_next_desc(&xchan->vchan);
struct xdma_device *xdev = xchan->xdev_hdl;
struct xdma_desc_block *block;
u32 val, completed_blocks;
struct xdma_desc *desc;
int ret;
/*
* check if there is not any submitted descriptor or channel is busy.
* vchan lock should be held where this function is called.
*/
if (!vd || xchan->busy)
return -EINVAL;
/* clear run stop bit to get ready for transfer */
ret = regmap_write(xdev->rmap, xchan->base + XDMA_CHAN_CONTROL_W1C,
CHAN_CTRL_RUN_STOP);
if (ret)
return ret;
desc = to_xdma_desc(vd);
if (desc->dir != xchan->dir) {
xdma_err(xdev, "incorrect request direction");
return -EINVAL;
}
/* set DMA engine to the first descriptor block */
completed_blocks = desc->completed_desc_num / XDMA_DESC_ADJACENT;
block = &desc->desc_blocks[completed_blocks];
val = lower_32_bits(block->dma_addr);
ret = regmap_write(xdev->rmap, xchan->base + XDMA_SGDMA_DESC_LO, val);
if (ret)
return ret;
val = upper_32_bits(block->dma_addr);
ret = regmap_write(xdev->rmap, xchan->base + XDMA_SGDMA_DESC_HI, val);
if (ret)
return ret;
if (completed_blocks + 1 == desc->dblk_num)
val = (desc->desc_num - 1) & XDMA_DESC_ADJACENT_MASK;
else
val = XDMA_DESC_ADJACENT - 1;
ret = regmap_write(xdev->rmap, xchan->base + XDMA_SGDMA_DESC_ADJ, val);
if (ret)
return ret;
/* kick off DMA transfer */
ret = regmap_write(xdev->rmap, xchan->base + XDMA_CHAN_CONTROL,
CHAN_CTRL_START);
if (ret)
return ret;
xchan->busy = true;
return 0;
}
/**
* xdma_alloc_channels - Detect and allocate DMA channels
* @xdev: DMA device pointer
* @dir: Channel direction
*/
static int xdma_alloc_channels(struct xdma_device *xdev,
enum dma_transfer_direction dir)
{
struct xdma_platdata *pdata = dev_get_platdata(&xdev->pdev->dev);
struct xdma_chan **chans, *xchan;
u32 base, identifier, target;
u32 *chan_num;
int i, j, ret;
if (dir == DMA_MEM_TO_DEV) {
base = XDMA_CHAN_H2C_OFFSET;
target = XDMA_CHAN_H2C_TARGET;
chans = &xdev->h2c_chans;
chan_num = &xdev->h2c_chan_num;
} else if (dir == DMA_DEV_TO_MEM) {
base = XDMA_CHAN_C2H_OFFSET;
target = XDMA_CHAN_C2H_TARGET;
chans = &xdev->c2h_chans;
chan_num = &xdev->c2h_chan_num;
} else {
xdma_err(xdev, "invalid direction specified");
return -EINVAL;
}
/* detect number of available DMA channels */
for (i = 0, *chan_num = 0; i < pdata->max_dma_channels; i++) {
ret = regmap_read(xdev->rmap, base + i * XDMA_CHAN_STRIDE,
&identifier);
if (ret)
return ret;
/* check if it is available DMA channel */
if (XDMA_CHAN_CHECK_TARGET(identifier, target))
(*chan_num)++;
}
if (!*chan_num) {
xdma_err(xdev, "does not probe any channel");
return -EINVAL;
}
*chans = devm_kcalloc(&xdev->pdev->dev, *chan_num, sizeof(**chans),
GFP_KERNEL);
if (!*chans)
return -ENOMEM;
for (i = 0, j = 0; i < pdata->max_dma_channels; i++) {
ret = regmap_read(xdev->rmap, base + i * XDMA_CHAN_STRIDE,
&identifier);
if (ret)
return ret;
if (!XDMA_CHAN_CHECK_TARGET(identifier, target))
continue;
if (j == *chan_num) {
xdma_err(xdev, "invalid channel number");
return -EIO;
}
/* init channel structure and hardware */
xchan = &(*chans)[j];
xchan->xdev_hdl = xdev;
xchan->base = base + i * XDMA_CHAN_STRIDE;
xchan->dir = dir;
ret = xdma_channel_init(xchan);
if (ret)
return ret;
xchan->vchan.desc_free = xdma_free_desc;
vchan_init(&xchan->vchan, &xdev->dma_dev);
j++;
}
dev_info(&xdev->pdev->dev, "configured %d %s channels", j,
(dir == DMA_MEM_TO_DEV) ? "H2C" : "C2H");
return 0;
}
/**
* xdma_issue_pending - Issue pending transactions
* @chan: DMA channel pointer
*/
static void xdma_issue_pending(struct dma_chan *chan)
{
struct xdma_chan *xdma_chan = to_xdma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&xdma_chan->vchan.lock, flags);
if (vchan_issue_pending(&xdma_chan->vchan))
xdma_xfer_start(xdma_chan);
spin_unlock_irqrestore(&xdma_chan->vchan.lock, flags);
}
/**
* xdma_prep_device_sg - prepare a descriptor for a DMA transaction
* @chan: DMA channel pointer
* @sgl: Transfer scatter gather list
* @sg_len: Length of scatter gather list
* @dir: Transfer direction
* @flags: transfer ack flags
* @context: APP words of the descriptor
*/
static struct dma_async_tx_descriptor *
xdma_prep_device_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct xdma_chan *xdma_chan = to_xdma_chan(chan);
struct dma_async_tx_descriptor *tx_desc;
u32 desc_num = 0, i, len, rest;
struct xdma_desc_block *dblk;
struct xdma_hw_desc *desc;
struct xdma_desc *sw_desc;
u64 dev_addr, *src, *dst;
struct scatterlist *sg;
u64 addr;
for_each_sg(sgl, sg, sg_len, i)
desc_num += DIV_ROUND_UP(sg_dma_len(sg), XDMA_DESC_BLEN_MAX);
sw_desc = xdma_alloc_desc(xdma_chan, desc_num);
if (!sw_desc)
return NULL;
sw_desc->dir = dir;
if (dir == DMA_MEM_TO_DEV) {
dev_addr = xdma_chan->cfg.dst_addr;
src = &addr;
dst = &dev_addr;
} else {
dev_addr = xdma_chan->cfg.src_addr;
src = &dev_addr;
dst = &addr;
}
dblk = sw_desc->desc_blocks;
desc = dblk->virt_addr;
desc_num = 1;
for_each_sg(sgl, sg, sg_len, i) {
addr = sg_dma_address(sg);
rest = sg_dma_len(sg);
do {
len = min_t(u32, rest, XDMA_DESC_BLEN_MAX);
/* set hardware descriptor */
desc->bytes = cpu_to_le32(len);
desc->src_addr = cpu_to_le64(*src);
desc->dst_addr = cpu_to_le64(*dst);
if (!(desc_num & XDMA_DESC_ADJACENT_MASK)) {
dblk++;
desc = dblk->virt_addr;
} else {
desc++;
}
desc_num++;
dev_addr += len;
addr += len;
rest -= len;
} while (rest);
}
tx_desc = vchan_tx_prep(&xdma_chan->vchan, &sw_desc->vdesc, flags);
if (!tx_desc)
goto failed;
return tx_desc;
failed:
xdma_free_desc(&sw_desc->vdesc);
return NULL;
}
/**
* xdma_device_config - Configure the DMA channel
* @chan: DMA channel
* @cfg: channel configuration
*/
static int xdma_device_config(struct dma_chan *chan,
struct dma_slave_config *cfg)
{
struct xdma_chan *xdma_chan = to_xdma_chan(chan);
memcpy(&xdma_chan->cfg, cfg, sizeof(*cfg));
return 0;
}
/**
* xdma_free_chan_resources - Free channel resources
* @chan: DMA channel
*/
static void xdma_free_chan_resources(struct dma_chan *chan)
{
struct xdma_chan *xdma_chan = to_xdma_chan(chan);
vchan_free_chan_resources(&xdma_chan->vchan);
dma_pool_destroy(xdma_chan->desc_pool);
xdma_chan->desc_pool = NULL;
}
/**
* xdma_alloc_chan_resources - Allocate channel resources
* @chan: DMA channel
*/
static int xdma_alloc_chan_resources(struct dma_chan *chan)
{
struct xdma_chan *xdma_chan = to_xdma_chan(chan);
struct xdma_device *xdev = xdma_chan->xdev_hdl;
struct device *dev = xdev->dma_dev.dev;
while (dev && !dev_is_pci(dev))
dev = dev->parent;
if (!dev) {
xdma_err(xdev, "unable to find pci device");
return -EINVAL;
}
xdma_chan->desc_pool = dma_pool_create(dma_chan_name(chan),
dev, XDMA_DESC_BLOCK_SIZE,
XDMA_DESC_BLOCK_ALIGN, 0);
if (!xdma_chan->desc_pool) {
xdma_err(xdev, "unable to allocate descriptor pool");
return -ENOMEM;
}
return 0;
}
/**
* xdma_channel_isr - XDMA channel interrupt handler
* @irq: IRQ number
* @dev_id: Pointer to the DMA channel structure
*/
static irqreturn_t xdma_channel_isr(int irq, void *dev_id)
{
struct xdma_chan *xchan = dev_id;
u32 complete_desc_num = 0;
struct xdma_device *xdev;
struct virt_dma_desc *vd;
struct xdma_desc *desc;
int ret;
spin_lock(&xchan->vchan.lock);
/* get submitted request */
vd = vchan_next_desc(&xchan->vchan);
if (!vd)
goto out;
xchan->busy = false;
desc = to_xdma_desc(vd);
xdev = xchan->xdev_hdl;
ret = regmap_read(xdev->rmap, xchan->base + XDMA_CHAN_COMPLETED_DESC,
&complete_desc_num);
if (ret)
goto out;
desc->completed_desc_num += complete_desc_num;
/*
* if all data blocks are transferred, remove and complete the request
*/
if (desc->completed_desc_num == desc->desc_num) {
list_del(&vd->node);
vchan_cookie_complete(vd);
goto out;
}
if (desc->completed_desc_num > desc->desc_num ||
complete_desc_num != XDMA_DESC_BLOCK_NUM * XDMA_DESC_ADJACENT)
goto out;
/* transfer the rest of data */
xdma_xfer_start(xchan);
out:
spin_unlock(&xchan->vchan.lock);
return IRQ_HANDLED;
}
/**
* xdma_irq_fini - Uninitialize IRQ
* @xdev: DMA device pointer
*/
static void xdma_irq_fini(struct xdma_device *xdev)
{
int i;
/* disable interrupt */
regmap_write(xdev->rmap, XDMA_IRQ_CHAN_INT_EN_W1C, ~0);
/* free irq handler */
for (i = 0; i < xdev->h2c_chan_num; i++)
free_irq(xdev->h2c_chans[i].irq, &xdev->h2c_chans[i]);
for (i = 0; i < xdev->c2h_chan_num; i++)
free_irq(xdev->c2h_chans[i].irq, &xdev->c2h_chans[i]);
}
/**
* xdma_set_vector_reg - configure hardware IRQ registers
* @xdev: DMA device pointer
* @vec_tbl_start: Start of IRQ registers
* @irq_start: Start of IRQ
* @irq_num: Number of IRQ
*/
static int xdma_set_vector_reg(struct xdma_device *xdev, u32 vec_tbl_start,
u32 irq_start, u32 irq_num)
{
u32 shift, i, val = 0;
int ret;
/* Each IRQ register is 32 bit and contains 4 IRQs */
while (irq_num > 0) {
for (i = 0; i < 4; i++) {
shift = XDMA_IRQ_VEC_SHIFT * i;
val |= irq_start << shift;
irq_start++;
irq_num--;
if (!irq_num)
break;
}
/* write IRQ register */
ret = regmap_write(xdev->rmap, vec_tbl_start, val);
if (ret)
return ret;
vec_tbl_start += sizeof(u32);
val = 0;
}
return 0;
}
/**
* xdma_irq_init - initialize IRQs
* @xdev: DMA device pointer
*/
static int xdma_irq_init(struct xdma_device *xdev)
{
u32 irq = xdev->irq_start;
u32 user_irq_start;
int i, j, ret;
/* return failure if there are not enough IRQs */
if (xdev->irq_num < XDMA_CHAN_NUM(xdev)) {
xdma_err(xdev, "not enough irq");
return -EINVAL;
}
/* setup H2C interrupt handler */
for (i = 0; i < xdev->h2c_chan_num; i++) {
ret = request_irq(irq, xdma_channel_isr, 0,
"xdma-h2c-channel", &xdev->h2c_chans[i]);
if (ret) {
xdma_err(xdev, "H2C channel%d request irq%d failed: %d",
i, irq, ret);
goto failed_init_h2c;
}
xdev->h2c_chans[i].irq = irq;
irq++;
}
/* setup C2H interrupt handler */
for (j = 0; j < xdev->c2h_chan_num; j++) {
ret = request_irq(irq, xdma_channel_isr, 0,
"xdma-c2h-channel", &xdev->c2h_chans[j]);
if (ret) {
xdma_err(xdev, "C2H channel%d request irq%d failed: %d",
j, irq, ret);
goto failed_init_c2h;
}
xdev->c2h_chans[j].irq = irq;
irq++;
}
/* config hardware IRQ registers */
ret = xdma_set_vector_reg(xdev, XDMA_IRQ_CHAN_VEC_NUM, 0,
XDMA_CHAN_NUM(xdev));
if (ret) {
xdma_err(xdev, "failed to set channel vectors: %d", ret);
goto failed_init_c2h;
}
/* config user IRQ registers if needed */
user_irq_start = XDMA_CHAN_NUM(xdev);
if (xdev->irq_num > user_irq_start) {
ret = xdma_set_vector_reg(xdev, XDMA_IRQ_USER_VEC_NUM,
user_irq_start,
xdev->irq_num - user_irq_start);
if (ret) {
xdma_err(xdev, "failed to set user vectors: %d", ret);
goto failed_init_c2h;
}
}
/* enable interrupt */
ret = regmap_write(xdev->rmap, XDMA_IRQ_CHAN_INT_EN_W1S, ~0);
if (ret)
goto failed_init_c2h;
return 0;
failed_init_c2h:
while (j--)
free_irq(xdev->c2h_chans[j].irq, &xdev->c2h_chans[j]);
failed_init_h2c:
while (i--)
free_irq(xdev->h2c_chans[i].irq, &xdev->h2c_chans[i]);
return ret;
}
static bool xdma_filter_fn(struct dma_chan *chan, void *param)
{
struct xdma_chan *xdma_chan = to_xdma_chan(chan);
struct xdma_chan_info *chan_info = param;
return chan_info->dir == xdma_chan->dir;
}
/**
* xdma_disable_user_irq - Disable user interrupt
* @pdev: Pointer to the platform_device structure
* @irq_num: System IRQ number
*/
void xdma_disable_user_irq(struct platform_device *pdev, u32 irq_num)
{
struct xdma_device *xdev = platform_get_drvdata(pdev);
u32 index;
index = irq_num - xdev->irq_start;
if (index < XDMA_CHAN_NUM(xdev) || index >= xdev->irq_num) {
xdma_err(xdev, "invalid user irq number");
return;
}
index -= XDMA_CHAN_NUM(xdev);
regmap_write(xdev->rmap, XDMA_IRQ_USER_INT_EN_W1C, 1 << index);
}
EXPORT_SYMBOL(xdma_disable_user_irq);
/**
* xdma_enable_user_irq - Enable user logic interrupt
* @pdev: Pointer to the platform_device structure
* @irq_num: System IRQ number
*/
int xdma_enable_user_irq(struct platform_device *pdev, u32 irq_num)
{
struct xdma_device *xdev = platform_get_drvdata(pdev);
u32 index;
int ret;
index = irq_num - xdev->irq_start;
if (index < XDMA_CHAN_NUM(xdev) || index >= xdev->irq_num) {
xdma_err(xdev, "invalid user irq number");
return -EINVAL;
}
index -= XDMA_CHAN_NUM(xdev);
ret = regmap_write(xdev->rmap, XDMA_IRQ_USER_INT_EN_W1S, 1 << index);
if (ret)
return ret;
return 0;
}
EXPORT_SYMBOL(xdma_enable_user_irq);
/**
* xdma_get_user_irq - Get system IRQ number
* @pdev: Pointer to the platform_device structure
* @user_irq_index: User logic IRQ wire index
*
* Return: The system IRQ number allocated for the given wire index.
*/
int xdma_get_user_irq(struct platform_device *pdev, u32 user_irq_index)
{
struct xdma_device *xdev = platform_get_drvdata(pdev);
if (XDMA_CHAN_NUM(xdev) + user_irq_index >= xdev->irq_num) {
xdma_err(xdev, "invalid user irq index");
return -EINVAL;
}
return xdev->irq_start + XDMA_CHAN_NUM(xdev) + user_irq_index;
}
EXPORT_SYMBOL(xdma_get_user_irq);
/**
* xdma_remove - Driver remove function
* @pdev: Pointer to the platform_device structure
*/
static int xdma_remove(struct platform_device *pdev)
{
struct xdma_device *xdev = platform_get_drvdata(pdev);
if (xdev->status & XDMA_DEV_STATUS_INIT_MSIX)
xdma_irq_fini(xdev);
if (xdev->status & XDMA_DEV_STATUS_REG_DMA)
dma_async_device_unregister(&xdev->dma_dev);
return 0;
}
/**
* xdma_probe - Driver probe function
* @pdev: Pointer to the platform_device structure
*/
static int xdma_probe(struct platform_device *pdev)
{
struct xdma_platdata *pdata = dev_get_platdata(&pdev->dev);
struct xdma_device *xdev;
void __iomem *reg_base;
struct resource *res;
int ret = -ENODEV;
if (pdata->max_dma_channels > XDMA_MAX_CHANNELS) {
dev_err(&pdev->dev, "invalid max dma channels %d",
pdata->max_dma_channels);
return -EINVAL;
}
xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
if (!xdev)
return -ENOMEM;
platform_set_drvdata(pdev, xdev);
xdev->pdev = pdev;
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res) {
xdma_err(xdev, "failed to get irq resource");
goto failed;
}
xdev->irq_start = res->start;
xdev->irq_num = res->end - res->start + 1;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
xdma_err(xdev, "failed to get io resource");
goto failed;
}
reg_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(reg_base)) {
xdma_err(xdev, "ioremap failed");
goto failed;
}
xdev->rmap = devm_regmap_init_mmio(&pdev->dev, reg_base,
&xdma_regmap_config);
if (!xdev->rmap) {
xdma_err(xdev, "config regmap failed: %d", ret);
goto failed;
}
INIT_LIST_HEAD(&xdev->dma_dev.channels);
ret = xdma_alloc_channels(xdev, DMA_MEM_TO_DEV);
if (ret) {
xdma_err(xdev, "config H2C channels failed: %d", ret);
goto failed;
}
ret = xdma_alloc_channels(xdev, DMA_DEV_TO_MEM);
if (ret) {
xdma_err(xdev, "config C2H channels failed: %d", ret);
goto failed;
}
dma_cap_set(DMA_SLAVE, xdev->dma_dev.cap_mask);
dma_cap_set(DMA_PRIVATE, xdev->dma_dev.cap_mask);
xdev->dma_dev.dev = &pdev->dev;
xdev->dma_dev.device_free_chan_resources = xdma_free_chan_resources;
xdev->dma_dev.device_alloc_chan_resources = xdma_alloc_chan_resources;
xdev->dma_dev.device_tx_status = dma_cookie_status;
xdev->dma_dev.device_prep_slave_sg = xdma_prep_device_sg;
xdev->dma_dev.device_config = xdma_device_config;
xdev->dma_dev.device_issue_pending = xdma_issue_pending;
xdev->dma_dev.filter.map = pdata->device_map;
xdev->dma_dev.filter.mapcnt = pdata->device_map_cnt;
xdev->dma_dev.filter.fn = xdma_filter_fn;
ret = dma_async_device_register(&xdev->dma_dev);
if (ret) {
xdma_err(xdev, "failed to register Xilinx XDMA: %d", ret);
goto failed;
}
xdev->status |= XDMA_DEV_STATUS_REG_DMA;
ret = xdma_irq_init(xdev);
if (ret) {
xdma_err(xdev, "failed to init msix: %d", ret);
goto failed;
}
xdev->status |= XDMA_DEV_STATUS_INIT_MSIX;
return 0;
failed:
xdma_remove(pdev);
return ret;
}
static const struct platform_device_id xdma_id_table[] = {
{ "xdma", 0},
{ },
};
static struct platform_driver xdma_driver = {
.driver = {
.name = "xdma",
},
.id_table = xdma_id_table,
.probe = xdma_probe,
.remove = xdma_remove,
};
module_platform_driver(xdma_driver);
MODULE_DESCRIPTION("AMD XDMA driver");
MODULE_AUTHOR("XRT Team <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/dma/xilinx/xdma.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DMA driver for Xilinx ZynqMP DMA Engine
*
* Copyright (C) 2016 Xilinx, Inc. All rights reserved.
*/
#include <linux/bitops.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/pm_runtime.h>
#include "../dmaengine.h"
/* Register Offsets */
#define ZYNQMP_DMA_ISR 0x100
#define ZYNQMP_DMA_IMR 0x104
#define ZYNQMP_DMA_IER 0x108
#define ZYNQMP_DMA_IDS 0x10C
#define ZYNQMP_DMA_CTRL0 0x110
#define ZYNQMP_DMA_CTRL1 0x114
#define ZYNQMP_DMA_DATA_ATTR 0x120
#define ZYNQMP_DMA_DSCR_ATTR 0x124
#define ZYNQMP_DMA_SRC_DSCR_WRD0 0x128
#define ZYNQMP_DMA_SRC_DSCR_WRD1 0x12C
#define ZYNQMP_DMA_SRC_DSCR_WRD2 0x130
#define ZYNQMP_DMA_SRC_DSCR_WRD3 0x134
#define ZYNQMP_DMA_DST_DSCR_WRD0 0x138
#define ZYNQMP_DMA_DST_DSCR_WRD1 0x13C
#define ZYNQMP_DMA_DST_DSCR_WRD2 0x140
#define ZYNQMP_DMA_DST_DSCR_WRD3 0x144
#define ZYNQMP_DMA_SRC_START_LSB 0x158
#define ZYNQMP_DMA_SRC_START_MSB 0x15C
#define ZYNQMP_DMA_DST_START_LSB 0x160
#define ZYNQMP_DMA_DST_START_MSB 0x164
#define ZYNQMP_DMA_TOTAL_BYTE 0x188
#define ZYNQMP_DMA_RATE_CTRL 0x18C
#define ZYNQMP_DMA_IRQ_SRC_ACCT 0x190
#define ZYNQMP_DMA_IRQ_DST_ACCT 0x194
#define ZYNQMP_DMA_CTRL2 0x200
/* Interrupt registers bit field definitions */
#define ZYNQMP_DMA_DONE BIT(10)
#define ZYNQMP_DMA_AXI_WR_DATA BIT(9)
#define ZYNQMP_DMA_AXI_RD_DATA BIT(8)
#define ZYNQMP_DMA_AXI_RD_DST_DSCR BIT(7)
#define ZYNQMP_DMA_AXI_RD_SRC_DSCR BIT(6)
#define ZYNQMP_DMA_IRQ_DST_ACCT_ERR BIT(5)
#define ZYNQMP_DMA_IRQ_SRC_ACCT_ERR BIT(4)
#define ZYNQMP_DMA_BYTE_CNT_OVRFL BIT(3)
#define ZYNQMP_DMA_DST_DSCR_DONE BIT(2)
#define ZYNQMP_DMA_INV_APB BIT(0)
/* Control 0 register bit field definitions */
#define ZYNQMP_DMA_OVR_FETCH BIT(7)
#define ZYNQMP_DMA_POINT_TYPE_SG BIT(6)
#define ZYNQMP_DMA_RATE_CTRL_EN BIT(3)
/* Control 1 register bit field definitions */
#define ZYNQMP_DMA_SRC_ISSUE GENMASK(4, 0)
/* Data Attribute register bit field definitions */
#define ZYNQMP_DMA_ARBURST GENMASK(27, 26)
#define ZYNQMP_DMA_ARCACHE GENMASK(25, 22)
#define ZYNQMP_DMA_ARCACHE_OFST 22
#define ZYNQMP_DMA_ARQOS GENMASK(21, 18)
#define ZYNQMP_DMA_ARQOS_OFST 18
#define ZYNQMP_DMA_ARLEN GENMASK(17, 14)
#define ZYNQMP_DMA_ARLEN_OFST 14
#define ZYNQMP_DMA_AWBURST GENMASK(13, 12)
#define ZYNQMP_DMA_AWCACHE GENMASK(11, 8)
#define ZYNQMP_DMA_AWCACHE_OFST 8
#define ZYNQMP_DMA_AWQOS GENMASK(7, 4)
#define ZYNQMP_DMA_AWQOS_OFST 4
#define ZYNQMP_DMA_AWLEN GENMASK(3, 0)
#define ZYNQMP_DMA_AWLEN_OFST 0
/* Descriptor Attribute register bit field definitions */
#define ZYNQMP_DMA_AXCOHRNT BIT(8)
#define ZYNQMP_DMA_AXCACHE GENMASK(7, 4)
#define ZYNQMP_DMA_AXCACHE_OFST 4
#define ZYNQMP_DMA_AXQOS GENMASK(3, 0)
#define ZYNQMP_DMA_AXQOS_OFST 0
/* Control register 2 bit field definitions */
#define ZYNQMP_DMA_ENABLE BIT(0)
/* Buffer Descriptor definitions */
#define ZYNQMP_DMA_DESC_CTRL_STOP 0x10
#define ZYNQMP_DMA_DESC_CTRL_COMP_INT 0x4
#define ZYNQMP_DMA_DESC_CTRL_SIZE_256 0x2
#define ZYNQMP_DMA_DESC_CTRL_COHRNT 0x1
/* Interrupt Mask specific definitions */
#define ZYNQMP_DMA_INT_ERR (ZYNQMP_DMA_AXI_RD_DATA | \
ZYNQMP_DMA_AXI_WR_DATA | \
ZYNQMP_DMA_AXI_RD_DST_DSCR | \
ZYNQMP_DMA_AXI_RD_SRC_DSCR | \
ZYNQMP_DMA_INV_APB)
#define ZYNQMP_DMA_INT_OVRFL (ZYNQMP_DMA_BYTE_CNT_OVRFL | \
ZYNQMP_DMA_IRQ_SRC_ACCT_ERR | \
ZYNQMP_DMA_IRQ_DST_ACCT_ERR)
#define ZYNQMP_DMA_INT_DONE (ZYNQMP_DMA_DONE | ZYNQMP_DMA_DST_DSCR_DONE)
#define ZYNQMP_DMA_INT_EN_DEFAULT_MASK (ZYNQMP_DMA_INT_DONE | \
ZYNQMP_DMA_INT_ERR | \
ZYNQMP_DMA_INT_OVRFL | \
ZYNQMP_DMA_DST_DSCR_DONE)
/* Max number of descriptors per channel */
#define ZYNQMP_DMA_NUM_DESCS 32
/* Max transfer size per descriptor */
#define ZYNQMP_DMA_MAX_TRANS_LEN 0x40000000
/* Max burst lengths */
#define ZYNQMP_DMA_MAX_DST_BURST_LEN 32768U
#define ZYNQMP_DMA_MAX_SRC_BURST_LEN 32768U
/* Reset values for data attributes */
#define ZYNQMP_DMA_AXCACHE_VAL 0xF
#define ZYNQMP_DMA_SRC_ISSUE_RST_VAL 0x1F
#define ZYNQMP_DMA_IDS_DEFAULT_MASK 0xFFF
/* Bus width in bits */
#define ZYNQMP_DMA_BUS_WIDTH_64 64
#define ZYNQMP_DMA_BUS_WIDTH_128 128
#define ZDMA_PM_TIMEOUT 100
#define ZYNQMP_DMA_DESC_SIZE(chan) (chan->desc_size)
#define to_chan(chan) container_of(chan, struct zynqmp_dma_chan, \
common)
#define tx_to_desc(tx) container_of(tx, struct zynqmp_dma_desc_sw, \
async_tx)
/**
* struct zynqmp_dma_desc_ll - Hw linked list descriptor
* @addr: Buffer address
* @size: Size of the buffer
* @ctrl: Control word
* @nxtdscraddr: Next descriptor base address
* @rsvd: Reserved field and for Hw internal use.
*/
struct zynqmp_dma_desc_ll {
u64 addr;
u32 size;
u32 ctrl;
u64 nxtdscraddr;
u64 rsvd;
};
/**
* struct zynqmp_dma_desc_sw - Per Transaction structure
* @src: Source address for simple mode dma
* @dst: Destination address for simple mode dma
* @len: Transfer length for simple mode dma
* @node: Node in the channel descriptor list
* @tx_list: List head for the current transfer
* @async_tx: Async transaction descriptor
* @src_v: Virtual address of the src descriptor
* @src_p: Physical address of the src descriptor
* @dst_v: Virtual address of the dst descriptor
* @dst_p: Physical address of the dst descriptor
*/
struct zynqmp_dma_desc_sw {
u64 src;
u64 dst;
u32 len;
struct list_head node;
struct list_head tx_list;
struct dma_async_tx_descriptor async_tx;
struct zynqmp_dma_desc_ll *src_v;
dma_addr_t src_p;
struct zynqmp_dma_desc_ll *dst_v;
dma_addr_t dst_p;
};
/**
* struct zynqmp_dma_chan - Driver specific DMA channel structure
* @zdev: Driver specific device structure
* @regs: Control registers offset
* @lock: Descriptor operation lock
* @pending_list: Descriptors waiting
* @free_list: Descriptors free
* @active_list: Descriptors active
* @sw_desc_pool: SW descriptor pool
* @done_list: Complete descriptors
* @common: DMA common channel
* @desc_pool_v: Statically allocated descriptor base
* @desc_pool_p: Physical allocated descriptor base
* @desc_free_cnt: Descriptor available count
* @dev: The dma device
* @irq: Channel IRQ
* @is_dmacoherent: Tells whether dma operations are coherent or not
* @tasklet: Cleanup work after irq
* @idle : Channel status;
* @desc_size: Size of the low level descriptor
* @err: Channel has errors
* @bus_width: Bus width
* @src_burst_len: Source burst length
* @dst_burst_len: Dest burst length
*/
struct zynqmp_dma_chan {
struct zynqmp_dma_device *zdev;
void __iomem *regs;
spinlock_t lock;
struct list_head pending_list;
struct list_head free_list;
struct list_head active_list;
struct zynqmp_dma_desc_sw *sw_desc_pool;
struct list_head done_list;
struct dma_chan common;
void *desc_pool_v;
dma_addr_t desc_pool_p;
u32 desc_free_cnt;
struct device *dev;
int irq;
bool is_dmacoherent;
struct tasklet_struct tasklet;
bool idle;
size_t desc_size;
bool err;
u32 bus_width;
u32 src_burst_len;
u32 dst_burst_len;
};
/**
* struct zynqmp_dma_device - DMA device structure
* @dev: Device Structure
* @common: DMA device structure
* @chan: Driver specific DMA channel
* @clk_main: Pointer to main clock
* @clk_apb: Pointer to apb clock
*/
struct zynqmp_dma_device {
struct device *dev;
struct dma_device common;
struct zynqmp_dma_chan *chan;
struct clk *clk_main;
struct clk *clk_apb;
};
static inline void zynqmp_dma_writeq(struct zynqmp_dma_chan *chan, u32 reg,
u64 value)
{
lo_hi_writeq(value, chan->regs + reg);
}
/**
* zynqmp_dma_update_desc_to_ctrlr - Updates descriptor to the controller
* @chan: ZynqMP DMA DMA channel pointer
* @desc: Transaction descriptor pointer
*/
static void zynqmp_dma_update_desc_to_ctrlr(struct zynqmp_dma_chan *chan,
struct zynqmp_dma_desc_sw *desc)
{
dma_addr_t addr;
addr = desc->src_p;
zynqmp_dma_writeq(chan, ZYNQMP_DMA_SRC_START_LSB, addr);
addr = desc->dst_p;
zynqmp_dma_writeq(chan, ZYNQMP_DMA_DST_START_LSB, addr);
}
/**
* zynqmp_dma_desc_config_eod - Mark the descriptor as end descriptor
* @chan: ZynqMP DMA channel pointer
* @desc: Hw descriptor pointer
*/
static void zynqmp_dma_desc_config_eod(struct zynqmp_dma_chan *chan,
void *desc)
{
struct zynqmp_dma_desc_ll *hw = (struct zynqmp_dma_desc_ll *)desc;
hw->ctrl |= ZYNQMP_DMA_DESC_CTRL_STOP;
hw++;
hw->ctrl |= ZYNQMP_DMA_DESC_CTRL_COMP_INT | ZYNQMP_DMA_DESC_CTRL_STOP;
}
/**
* zynqmp_dma_config_sg_ll_desc - Configure the linked list descriptor
* @chan: ZynqMP DMA channel pointer
* @sdesc: Hw descriptor pointer
* @src: Source buffer address
* @dst: Destination buffer address
* @len: Transfer length
* @prev: Previous hw descriptor pointer
*/
static void zynqmp_dma_config_sg_ll_desc(struct zynqmp_dma_chan *chan,
struct zynqmp_dma_desc_ll *sdesc,
dma_addr_t src, dma_addr_t dst, size_t len,
struct zynqmp_dma_desc_ll *prev)
{
struct zynqmp_dma_desc_ll *ddesc = sdesc + 1;
sdesc->size = ddesc->size = len;
sdesc->addr = src;
ddesc->addr = dst;
sdesc->ctrl = ddesc->ctrl = ZYNQMP_DMA_DESC_CTRL_SIZE_256;
if (chan->is_dmacoherent) {
sdesc->ctrl |= ZYNQMP_DMA_DESC_CTRL_COHRNT;
ddesc->ctrl |= ZYNQMP_DMA_DESC_CTRL_COHRNT;
}
if (prev) {
dma_addr_t addr = chan->desc_pool_p +
((uintptr_t)sdesc - (uintptr_t)chan->desc_pool_v);
ddesc = prev + 1;
prev->nxtdscraddr = addr;
ddesc->nxtdscraddr = addr + ZYNQMP_DMA_DESC_SIZE(chan);
}
}
/**
* zynqmp_dma_init - Initialize the channel
* @chan: ZynqMP DMA channel pointer
*/
static void zynqmp_dma_init(struct zynqmp_dma_chan *chan)
{
u32 val;
writel(ZYNQMP_DMA_IDS_DEFAULT_MASK, chan->regs + ZYNQMP_DMA_IDS);
val = readl(chan->regs + ZYNQMP_DMA_ISR);
writel(val, chan->regs + ZYNQMP_DMA_ISR);
if (chan->is_dmacoherent) {
val = ZYNQMP_DMA_AXCOHRNT;
val = (val & ~ZYNQMP_DMA_AXCACHE) |
(ZYNQMP_DMA_AXCACHE_VAL << ZYNQMP_DMA_AXCACHE_OFST);
writel(val, chan->regs + ZYNQMP_DMA_DSCR_ATTR);
}
val = readl(chan->regs + ZYNQMP_DMA_DATA_ATTR);
if (chan->is_dmacoherent) {
val = (val & ~ZYNQMP_DMA_ARCACHE) |
(ZYNQMP_DMA_AXCACHE_VAL << ZYNQMP_DMA_ARCACHE_OFST);
val = (val & ~ZYNQMP_DMA_AWCACHE) |
(ZYNQMP_DMA_AXCACHE_VAL << ZYNQMP_DMA_AWCACHE_OFST);
}
writel(val, chan->regs + ZYNQMP_DMA_DATA_ATTR);
/* Clearing the interrupt account rgisters */
val = readl(chan->regs + ZYNQMP_DMA_IRQ_SRC_ACCT);
val = readl(chan->regs + ZYNQMP_DMA_IRQ_DST_ACCT);
chan->idle = true;
}
/**
* zynqmp_dma_tx_submit - Submit DMA transaction
* @tx: Async transaction descriptor pointer
*
* Return: cookie value
*/
static dma_cookie_t zynqmp_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct zynqmp_dma_chan *chan = to_chan(tx->chan);
struct zynqmp_dma_desc_sw *desc, *new;
dma_cookie_t cookie;
unsigned long irqflags;
new = tx_to_desc(tx);
spin_lock_irqsave(&chan->lock, irqflags);
cookie = dma_cookie_assign(tx);
if (!list_empty(&chan->pending_list)) {
desc = list_last_entry(&chan->pending_list,
struct zynqmp_dma_desc_sw, node);
if (!list_empty(&desc->tx_list))
desc = list_last_entry(&desc->tx_list,
struct zynqmp_dma_desc_sw, node);
desc->src_v->nxtdscraddr = new->src_p;
desc->src_v->ctrl &= ~ZYNQMP_DMA_DESC_CTRL_STOP;
desc->dst_v->nxtdscraddr = new->dst_p;
desc->dst_v->ctrl &= ~ZYNQMP_DMA_DESC_CTRL_STOP;
}
list_add_tail(&new->node, &chan->pending_list);
spin_unlock_irqrestore(&chan->lock, irqflags);
return cookie;
}
/**
* zynqmp_dma_get_descriptor - Get the sw descriptor from the pool
* @chan: ZynqMP DMA channel pointer
*
* Return: The sw descriptor
*/
static struct zynqmp_dma_desc_sw *
zynqmp_dma_get_descriptor(struct zynqmp_dma_chan *chan)
{
struct zynqmp_dma_desc_sw *desc;
unsigned long irqflags;
spin_lock_irqsave(&chan->lock, irqflags);
desc = list_first_entry(&chan->free_list,
struct zynqmp_dma_desc_sw, node);
list_del(&desc->node);
spin_unlock_irqrestore(&chan->lock, irqflags);
INIT_LIST_HEAD(&desc->tx_list);
/* Clear the src and dst descriptor memory */
memset((void *)desc->src_v, 0, ZYNQMP_DMA_DESC_SIZE(chan));
memset((void *)desc->dst_v, 0, ZYNQMP_DMA_DESC_SIZE(chan));
return desc;
}
/**
* zynqmp_dma_free_descriptor - Issue pending transactions
* @chan: ZynqMP DMA channel pointer
* @sdesc: Transaction descriptor pointer
*/
static void zynqmp_dma_free_descriptor(struct zynqmp_dma_chan *chan,
struct zynqmp_dma_desc_sw *sdesc)
{
struct zynqmp_dma_desc_sw *child, *next;
chan->desc_free_cnt++;
list_move_tail(&sdesc->node, &chan->free_list);
list_for_each_entry_safe(child, next, &sdesc->tx_list, node) {
chan->desc_free_cnt++;
list_move_tail(&child->node, &chan->free_list);
}
}
/**
* zynqmp_dma_free_desc_list - Free descriptors list
* @chan: ZynqMP DMA channel pointer
* @list: List to parse and delete the descriptor
*/
static void zynqmp_dma_free_desc_list(struct zynqmp_dma_chan *chan,
struct list_head *list)
{
struct zynqmp_dma_desc_sw *desc, *next;
list_for_each_entry_safe(desc, next, list, node)
zynqmp_dma_free_descriptor(chan, desc);
}
/**
* zynqmp_dma_alloc_chan_resources - Allocate channel resources
* @dchan: DMA channel
*
* Return: Number of descriptors on success and failure value on error
*/
static int zynqmp_dma_alloc_chan_resources(struct dma_chan *dchan)
{
struct zynqmp_dma_chan *chan = to_chan(dchan);
struct zynqmp_dma_desc_sw *desc;
int i, ret;
ret = pm_runtime_resume_and_get(chan->dev);
if (ret < 0)
return ret;
chan->sw_desc_pool = kcalloc(ZYNQMP_DMA_NUM_DESCS, sizeof(*desc),
GFP_KERNEL);
if (!chan->sw_desc_pool)
return -ENOMEM;
chan->idle = true;
chan->desc_free_cnt = ZYNQMP_DMA_NUM_DESCS;
INIT_LIST_HEAD(&chan->free_list);
for (i = 0; i < ZYNQMP_DMA_NUM_DESCS; i++) {
desc = chan->sw_desc_pool + i;
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
desc->async_tx.tx_submit = zynqmp_dma_tx_submit;
list_add_tail(&desc->node, &chan->free_list);
}
chan->desc_pool_v = dma_alloc_coherent(chan->dev,
(2 * ZYNQMP_DMA_DESC_SIZE(chan) *
ZYNQMP_DMA_NUM_DESCS),
&chan->desc_pool_p, GFP_KERNEL);
if (!chan->desc_pool_v)
return -ENOMEM;
for (i = 0; i < ZYNQMP_DMA_NUM_DESCS; i++) {
desc = chan->sw_desc_pool + i;
desc->src_v = (struct zynqmp_dma_desc_ll *) (chan->desc_pool_v +
(i * ZYNQMP_DMA_DESC_SIZE(chan) * 2));
desc->dst_v = (struct zynqmp_dma_desc_ll *) (desc->src_v + 1);
desc->src_p = chan->desc_pool_p +
(i * ZYNQMP_DMA_DESC_SIZE(chan) * 2);
desc->dst_p = desc->src_p + ZYNQMP_DMA_DESC_SIZE(chan);
}
return ZYNQMP_DMA_NUM_DESCS;
}
/**
* zynqmp_dma_start - Start DMA channel
* @chan: ZynqMP DMA channel pointer
*/
static void zynqmp_dma_start(struct zynqmp_dma_chan *chan)
{
writel(ZYNQMP_DMA_INT_EN_DEFAULT_MASK, chan->regs + ZYNQMP_DMA_IER);
writel(0, chan->regs + ZYNQMP_DMA_TOTAL_BYTE);
chan->idle = false;
writel(ZYNQMP_DMA_ENABLE, chan->regs + ZYNQMP_DMA_CTRL2);
}
/**
* zynqmp_dma_handle_ovfl_int - Process the overflow interrupt
* @chan: ZynqMP DMA channel pointer
* @status: Interrupt status value
*/
static void zynqmp_dma_handle_ovfl_int(struct zynqmp_dma_chan *chan, u32 status)
{
if (status & ZYNQMP_DMA_BYTE_CNT_OVRFL)
writel(0, chan->regs + ZYNQMP_DMA_TOTAL_BYTE);
if (status & ZYNQMP_DMA_IRQ_DST_ACCT_ERR)
readl(chan->regs + ZYNQMP_DMA_IRQ_DST_ACCT);
if (status & ZYNQMP_DMA_IRQ_SRC_ACCT_ERR)
readl(chan->regs + ZYNQMP_DMA_IRQ_SRC_ACCT);
}
static void zynqmp_dma_config(struct zynqmp_dma_chan *chan)
{
u32 val, burst_val;
val = readl(chan->regs + ZYNQMP_DMA_CTRL0);
val |= ZYNQMP_DMA_POINT_TYPE_SG;
writel(val, chan->regs + ZYNQMP_DMA_CTRL0);
val = readl(chan->regs + ZYNQMP_DMA_DATA_ATTR);
burst_val = __ilog2_u32(chan->src_burst_len);
val = (val & ~ZYNQMP_DMA_ARLEN) |
((burst_val << ZYNQMP_DMA_ARLEN_OFST) & ZYNQMP_DMA_ARLEN);
burst_val = __ilog2_u32(chan->dst_burst_len);
val = (val & ~ZYNQMP_DMA_AWLEN) |
((burst_val << ZYNQMP_DMA_AWLEN_OFST) & ZYNQMP_DMA_AWLEN);
writel(val, chan->regs + ZYNQMP_DMA_DATA_ATTR);
}
/**
* zynqmp_dma_device_config - Zynqmp dma device configuration
* @dchan: DMA channel
* @config: DMA device config
*
* Return: 0 always
*/
static int zynqmp_dma_device_config(struct dma_chan *dchan,
struct dma_slave_config *config)
{
struct zynqmp_dma_chan *chan = to_chan(dchan);
chan->src_burst_len = clamp(config->src_maxburst, 1U,
ZYNQMP_DMA_MAX_SRC_BURST_LEN);
chan->dst_burst_len = clamp(config->dst_maxburst, 1U,
ZYNQMP_DMA_MAX_DST_BURST_LEN);
return 0;
}
/**
* zynqmp_dma_start_transfer - Initiate the new transfer
* @chan: ZynqMP DMA channel pointer
*/
static void zynqmp_dma_start_transfer(struct zynqmp_dma_chan *chan)
{
struct zynqmp_dma_desc_sw *desc;
if (!chan->idle)
return;
zynqmp_dma_config(chan);
desc = list_first_entry_or_null(&chan->pending_list,
struct zynqmp_dma_desc_sw, node);
if (!desc)
return;
list_splice_tail_init(&chan->pending_list, &chan->active_list);
zynqmp_dma_update_desc_to_ctrlr(chan, desc);
zynqmp_dma_start(chan);
}
/**
* zynqmp_dma_chan_desc_cleanup - Cleanup the completed descriptors
* @chan: ZynqMP DMA channel
*/
static void zynqmp_dma_chan_desc_cleanup(struct zynqmp_dma_chan *chan)
{
struct zynqmp_dma_desc_sw *desc, *next;
unsigned long irqflags;
spin_lock_irqsave(&chan->lock, irqflags);
list_for_each_entry_safe(desc, next, &chan->done_list, node) {
struct dmaengine_desc_callback cb;
dmaengine_desc_get_callback(&desc->async_tx, &cb);
if (dmaengine_desc_callback_valid(&cb)) {
spin_unlock_irqrestore(&chan->lock, irqflags);
dmaengine_desc_callback_invoke(&cb, NULL);
spin_lock_irqsave(&chan->lock, irqflags);
}
/* Run any dependencies, then free the descriptor */
zynqmp_dma_free_descriptor(chan, desc);
}
spin_unlock_irqrestore(&chan->lock, irqflags);
}
/**
* zynqmp_dma_complete_descriptor - Mark the active descriptor as complete
* @chan: ZynqMP DMA channel pointer
*/
static void zynqmp_dma_complete_descriptor(struct zynqmp_dma_chan *chan)
{
struct zynqmp_dma_desc_sw *desc;
desc = list_first_entry_or_null(&chan->active_list,
struct zynqmp_dma_desc_sw, node);
if (!desc)
return;
list_del(&desc->node);
dma_cookie_complete(&desc->async_tx);
list_add_tail(&desc->node, &chan->done_list);
}
/**
* zynqmp_dma_issue_pending - Issue pending transactions
* @dchan: DMA channel pointer
*/
static void zynqmp_dma_issue_pending(struct dma_chan *dchan)
{
struct zynqmp_dma_chan *chan = to_chan(dchan);
unsigned long irqflags;
spin_lock_irqsave(&chan->lock, irqflags);
zynqmp_dma_start_transfer(chan);
spin_unlock_irqrestore(&chan->lock, irqflags);
}
/**
* zynqmp_dma_free_descriptors - Free channel descriptors
* @chan: ZynqMP DMA channel pointer
*/
static void zynqmp_dma_free_descriptors(struct zynqmp_dma_chan *chan)
{
unsigned long irqflags;
spin_lock_irqsave(&chan->lock, irqflags);
zynqmp_dma_free_desc_list(chan, &chan->active_list);
zynqmp_dma_free_desc_list(chan, &chan->pending_list);
zynqmp_dma_free_desc_list(chan, &chan->done_list);
spin_unlock_irqrestore(&chan->lock, irqflags);
}
/**
* zynqmp_dma_free_chan_resources - Free channel resources
* @dchan: DMA channel pointer
*/
static void zynqmp_dma_free_chan_resources(struct dma_chan *dchan)
{
struct zynqmp_dma_chan *chan = to_chan(dchan);
zynqmp_dma_free_descriptors(chan);
dma_free_coherent(chan->dev,
(2 * ZYNQMP_DMA_DESC_SIZE(chan) * ZYNQMP_DMA_NUM_DESCS),
chan->desc_pool_v, chan->desc_pool_p);
kfree(chan->sw_desc_pool);
pm_runtime_mark_last_busy(chan->dev);
pm_runtime_put_autosuspend(chan->dev);
}
/**
* zynqmp_dma_reset - Reset the channel
* @chan: ZynqMP DMA channel pointer
*/
static void zynqmp_dma_reset(struct zynqmp_dma_chan *chan)
{
unsigned long irqflags;
writel(ZYNQMP_DMA_IDS_DEFAULT_MASK, chan->regs + ZYNQMP_DMA_IDS);
spin_lock_irqsave(&chan->lock, irqflags);
zynqmp_dma_complete_descriptor(chan);
spin_unlock_irqrestore(&chan->lock, irqflags);
zynqmp_dma_chan_desc_cleanup(chan);
zynqmp_dma_free_descriptors(chan);
zynqmp_dma_init(chan);
}
/**
* zynqmp_dma_irq_handler - ZynqMP DMA Interrupt handler
* @irq: IRQ number
* @data: Pointer to the ZynqMP DMA channel structure
*
* Return: IRQ_HANDLED/IRQ_NONE
*/
static irqreturn_t zynqmp_dma_irq_handler(int irq, void *data)
{
struct zynqmp_dma_chan *chan = (struct zynqmp_dma_chan *)data;
u32 isr, imr, status;
irqreturn_t ret = IRQ_NONE;
isr = readl(chan->regs + ZYNQMP_DMA_ISR);
imr = readl(chan->regs + ZYNQMP_DMA_IMR);
status = isr & ~imr;
writel(isr, chan->regs + ZYNQMP_DMA_ISR);
if (status & ZYNQMP_DMA_INT_DONE) {
tasklet_schedule(&chan->tasklet);
ret = IRQ_HANDLED;
}
if (status & ZYNQMP_DMA_DONE)
chan->idle = true;
if (status & ZYNQMP_DMA_INT_ERR) {
chan->err = true;
tasklet_schedule(&chan->tasklet);
dev_err(chan->dev, "Channel %p has errors\n", chan);
ret = IRQ_HANDLED;
}
if (status & ZYNQMP_DMA_INT_OVRFL) {
zynqmp_dma_handle_ovfl_int(chan, status);
dev_dbg(chan->dev, "Channel %p overflow interrupt\n", chan);
ret = IRQ_HANDLED;
}
return ret;
}
/**
* zynqmp_dma_do_tasklet - Schedule completion tasklet
* @t: Pointer to the ZynqMP DMA channel structure
*/
static void zynqmp_dma_do_tasklet(struct tasklet_struct *t)
{
struct zynqmp_dma_chan *chan = from_tasklet(chan, t, tasklet);
u32 count;
unsigned long irqflags;
if (chan->err) {
zynqmp_dma_reset(chan);
chan->err = false;
return;
}
spin_lock_irqsave(&chan->lock, irqflags);
count = readl(chan->regs + ZYNQMP_DMA_IRQ_DST_ACCT);
while (count) {
zynqmp_dma_complete_descriptor(chan);
count--;
}
spin_unlock_irqrestore(&chan->lock, irqflags);
zynqmp_dma_chan_desc_cleanup(chan);
if (chan->idle) {
spin_lock_irqsave(&chan->lock, irqflags);
zynqmp_dma_start_transfer(chan);
spin_unlock_irqrestore(&chan->lock, irqflags);
}
}
/**
* zynqmp_dma_device_terminate_all - Aborts all transfers on a channel
* @dchan: DMA channel pointer
*
* Return: Always '0'
*/
static int zynqmp_dma_device_terminate_all(struct dma_chan *dchan)
{
struct zynqmp_dma_chan *chan = to_chan(dchan);
writel(ZYNQMP_DMA_IDS_DEFAULT_MASK, chan->regs + ZYNQMP_DMA_IDS);
zynqmp_dma_free_descriptors(chan);
return 0;
}
/**
* zynqmp_dma_synchronize - Synchronizes the termination of a transfers to the current context.
* @dchan: DMA channel pointer
*/
static void zynqmp_dma_synchronize(struct dma_chan *dchan)
{
struct zynqmp_dma_chan *chan = to_chan(dchan);
tasklet_kill(&chan->tasklet);
}
/**
* zynqmp_dma_prep_memcpy - prepare descriptors for memcpy transaction
* @dchan: DMA channel
* @dma_dst: Destination buffer address
* @dma_src: Source buffer address
* @len: Transfer length
* @flags: transfer ack flags
*
* Return: Async transaction descriptor on success and NULL on failure
*/
static struct dma_async_tx_descriptor *zynqmp_dma_prep_memcpy(
struct dma_chan *dchan, dma_addr_t dma_dst,
dma_addr_t dma_src, size_t len, ulong flags)
{
struct zynqmp_dma_chan *chan;
struct zynqmp_dma_desc_sw *new, *first = NULL;
void *desc = NULL, *prev = NULL;
size_t copy;
u32 desc_cnt;
unsigned long irqflags;
chan = to_chan(dchan);
desc_cnt = DIV_ROUND_UP(len, ZYNQMP_DMA_MAX_TRANS_LEN);
spin_lock_irqsave(&chan->lock, irqflags);
if (desc_cnt > chan->desc_free_cnt) {
spin_unlock_irqrestore(&chan->lock, irqflags);
dev_dbg(chan->dev, "chan %p descs are not available\n", chan);
return NULL;
}
chan->desc_free_cnt = chan->desc_free_cnt - desc_cnt;
spin_unlock_irqrestore(&chan->lock, irqflags);
do {
/* Allocate and populate the descriptor */
new = zynqmp_dma_get_descriptor(chan);
copy = min_t(size_t, len, ZYNQMP_DMA_MAX_TRANS_LEN);
desc = (struct zynqmp_dma_desc_ll *)new->src_v;
zynqmp_dma_config_sg_ll_desc(chan, desc, dma_src,
dma_dst, copy, prev);
prev = desc;
len -= copy;
dma_src += copy;
dma_dst += copy;
if (!first)
first = new;
else
list_add_tail(&new->node, &first->tx_list);
} while (len);
zynqmp_dma_desc_config_eod(chan, desc);
async_tx_ack(&first->async_tx);
first->async_tx.flags = (enum dma_ctrl_flags)flags;
return &first->async_tx;
}
/**
* zynqmp_dma_chan_remove - Channel remove function
* @chan: ZynqMP DMA channel pointer
*/
static void zynqmp_dma_chan_remove(struct zynqmp_dma_chan *chan)
{
if (!chan)
return;
if (chan->irq)
devm_free_irq(chan->zdev->dev, chan->irq, chan);
tasklet_kill(&chan->tasklet);
list_del(&chan->common.device_node);
}
/**
* zynqmp_dma_chan_probe - Per Channel Probing
* @zdev: Driver specific device structure
* @pdev: Pointer to the platform_device structure
*
* Return: '0' on success and failure value on error
*/
static int zynqmp_dma_chan_probe(struct zynqmp_dma_device *zdev,
struct platform_device *pdev)
{
struct zynqmp_dma_chan *chan;
struct device_node *node = pdev->dev.of_node;
int err;
chan = devm_kzalloc(zdev->dev, sizeof(*chan), GFP_KERNEL);
if (!chan)
return -ENOMEM;
chan->dev = zdev->dev;
chan->zdev = zdev;
chan->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(chan->regs))
return PTR_ERR(chan->regs);
chan->bus_width = ZYNQMP_DMA_BUS_WIDTH_64;
chan->dst_burst_len = ZYNQMP_DMA_MAX_DST_BURST_LEN;
chan->src_burst_len = ZYNQMP_DMA_MAX_SRC_BURST_LEN;
err = of_property_read_u32(node, "xlnx,bus-width", &chan->bus_width);
if (err < 0) {
dev_err(&pdev->dev, "missing xlnx,bus-width property\n");
return err;
}
if (chan->bus_width != ZYNQMP_DMA_BUS_WIDTH_64 &&
chan->bus_width != ZYNQMP_DMA_BUS_WIDTH_128) {
dev_err(zdev->dev, "invalid bus-width value");
return -EINVAL;
}
chan->is_dmacoherent = of_property_read_bool(node, "dma-coherent");
zdev->chan = chan;
tasklet_setup(&chan->tasklet, zynqmp_dma_do_tasklet);
spin_lock_init(&chan->lock);
INIT_LIST_HEAD(&chan->active_list);
INIT_LIST_HEAD(&chan->pending_list);
INIT_LIST_HEAD(&chan->done_list);
INIT_LIST_HEAD(&chan->free_list);
dma_cookie_init(&chan->common);
chan->common.device = &zdev->common;
list_add_tail(&chan->common.device_node, &zdev->common.channels);
zynqmp_dma_init(chan);
chan->irq = platform_get_irq(pdev, 0);
if (chan->irq < 0)
return -ENXIO;
err = devm_request_irq(&pdev->dev, chan->irq, zynqmp_dma_irq_handler, 0,
"zynqmp-dma", chan);
if (err)
return err;
chan->desc_size = sizeof(struct zynqmp_dma_desc_ll);
chan->idle = true;
return 0;
}
/**
* of_zynqmp_dma_xlate - Translation function
* @dma_spec: Pointer to DMA specifier as found in the device tree
* @ofdma: Pointer to DMA controller data
*
* Return: DMA channel pointer on success and NULL on error
*/
static struct dma_chan *of_zynqmp_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct zynqmp_dma_device *zdev = ofdma->of_dma_data;
return dma_get_slave_channel(&zdev->chan->common);
}
/**
* zynqmp_dma_suspend - Suspend method for the driver
* @dev: Address of the device structure
*
* Put the driver into low power mode.
* Return: 0 on success and failure value on error
*/
static int __maybe_unused zynqmp_dma_suspend(struct device *dev)
{
if (!device_may_wakeup(dev))
return pm_runtime_force_suspend(dev);
return 0;
}
/**
* zynqmp_dma_resume - Resume from suspend
* @dev: Address of the device structure
*
* Resume operation after suspend.
* Return: 0 on success and failure value on error
*/
static int __maybe_unused zynqmp_dma_resume(struct device *dev)
{
if (!device_may_wakeup(dev))
return pm_runtime_force_resume(dev);
return 0;
}
/**
* zynqmp_dma_runtime_suspend - Runtime suspend method for the driver
* @dev: Address of the device structure
*
* Put the driver into low power mode.
* Return: 0 always
*/
static int __maybe_unused zynqmp_dma_runtime_suspend(struct device *dev)
{
struct zynqmp_dma_device *zdev = dev_get_drvdata(dev);
clk_disable_unprepare(zdev->clk_main);
clk_disable_unprepare(zdev->clk_apb);
return 0;
}
/**
* zynqmp_dma_runtime_resume - Runtime suspend method for the driver
* @dev: Address of the device structure
*
* Put the driver into low power mode.
* Return: 0 always
*/
static int __maybe_unused zynqmp_dma_runtime_resume(struct device *dev)
{
struct zynqmp_dma_device *zdev = dev_get_drvdata(dev);
int err;
err = clk_prepare_enable(zdev->clk_main);
if (err) {
dev_err(dev, "Unable to enable main clock.\n");
return err;
}
err = clk_prepare_enable(zdev->clk_apb);
if (err) {
dev_err(dev, "Unable to enable apb clock.\n");
clk_disable_unprepare(zdev->clk_main);
return err;
}
return 0;
}
static const struct dev_pm_ops zynqmp_dma_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dma_suspend, zynqmp_dma_resume)
SET_RUNTIME_PM_OPS(zynqmp_dma_runtime_suspend,
zynqmp_dma_runtime_resume, NULL)
};
/**
* zynqmp_dma_probe - Driver probe function
* @pdev: Pointer to the platform_device structure
*
* Return: '0' on success and failure value on error
*/
static int zynqmp_dma_probe(struct platform_device *pdev)
{
struct zynqmp_dma_device *zdev;
struct dma_device *p;
int ret;
zdev = devm_kzalloc(&pdev->dev, sizeof(*zdev), GFP_KERNEL);
if (!zdev)
return -ENOMEM;
zdev->dev = &pdev->dev;
INIT_LIST_HEAD(&zdev->common.channels);
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
if (ret) {
dev_err(&pdev->dev, "DMA not available for address range\n");
return ret;
}
dma_cap_set(DMA_MEMCPY, zdev->common.cap_mask);
p = &zdev->common;
p->device_prep_dma_memcpy = zynqmp_dma_prep_memcpy;
p->device_terminate_all = zynqmp_dma_device_terminate_all;
p->device_synchronize = zynqmp_dma_synchronize;
p->device_issue_pending = zynqmp_dma_issue_pending;
p->device_alloc_chan_resources = zynqmp_dma_alloc_chan_resources;
p->device_free_chan_resources = zynqmp_dma_free_chan_resources;
p->device_tx_status = dma_cookie_status;
p->device_config = zynqmp_dma_device_config;
p->dev = &pdev->dev;
zdev->clk_main = devm_clk_get(&pdev->dev, "clk_main");
if (IS_ERR(zdev->clk_main))
return dev_err_probe(&pdev->dev, PTR_ERR(zdev->clk_main),
"main clock not found.\n");
zdev->clk_apb = devm_clk_get(&pdev->dev, "clk_apb");
if (IS_ERR(zdev->clk_apb))
return dev_err_probe(&pdev->dev, PTR_ERR(zdev->clk_apb),
"apb clock not found.\n");
platform_set_drvdata(pdev, zdev);
pm_runtime_set_autosuspend_delay(zdev->dev, ZDMA_PM_TIMEOUT);
pm_runtime_use_autosuspend(zdev->dev);
pm_runtime_enable(zdev->dev);
ret = pm_runtime_resume_and_get(zdev->dev);
if (ret < 0) {
dev_err(&pdev->dev, "device wakeup failed.\n");
pm_runtime_disable(zdev->dev);
}
if (!pm_runtime_enabled(zdev->dev)) {
ret = zynqmp_dma_runtime_resume(zdev->dev);
if (ret)
return ret;
}
ret = zynqmp_dma_chan_probe(zdev, pdev);
if (ret) {
dev_err_probe(&pdev->dev, ret, "Probing channel failed\n");
goto err_disable_pm;
}
p->dst_addr_widths = BIT(zdev->chan->bus_width / 8);
p->src_addr_widths = BIT(zdev->chan->bus_width / 8);
ret = dma_async_device_register(&zdev->common);
if (ret) {
dev_err(zdev->dev, "failed to register the dma device\n");
goto free_chan_resources;
}
ret = of_dma_controller_register(pdev->dev.of_node,
of_zynqmp_dma_xlate, zdev);
if (ret) {
dev_err_probe(&pdev->dev, ret, "Unable to register DMA to DT\n");
dma_async_device_unregister(&zdev->common);
goto free_chan_resources;
}
pm_runtime_mark_last_busy(zdev->dev);
pm_runtime_put_sync_autosuspend(zdev->dev);
return 0;
free_chan_resources:
zynqmp_dma_chan_remove(zdev->chan);
err_disable_pm:
if (!pm_runtime_enabled(zdev->dev))
zynqmp_dma_runtime_suspend(zdev->dev);
pm_runtime_disable(zdev->dev);
return ret;
}
/**
* zynqmp_dma_remove - Driver remove function
* @pdev: Pointer to the platform_device structure
*
* Return: Always '0'
*/
static int zynqmp_dma_remove(struct platform_device *pdev)
{
struct zynqmp_dma_device *zdev = platform_get_drvdata(pdev);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&zdev->common);
zynqmp_dma_chan_remove(zdev->chan);
pm_runtime_disable(zdev->dev);
if (!pm_runtime_enabled(zdev->dev))
zynqmp_dma_runtime_suspend(zdev->dev);
return 0;
}
static const struct of_device_id zynqmp_dma_of_match[] = {
{ .compatible = "xlnx,zynqmp-dma-1.0", },
{}
};
MODULE_DEVICE_TABLE(of, zynqmp_dma_of_match);
static struct platform_driver zynqmp_dma_driver = {
.driver = {
.name = "xilinx-zynqmp-dma",
.of_match_table = zynqmp_dma_of_match,
.pm = &zynqmp_dma_dev_pm_ops,
},
.probe = zynqmp_dma_probe,
.remove = zynqmp_dma_remove,
};
module_platform_driver(zynqmp_dma_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("Xilinx ZynqMP DMA driver");
| linux-master | drivers/dma/xilinx/zynqmp_dma.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Xilinx ZynqMP DPDMA Engine driver
*
* Copyright (C) 2015 - 2020 Xilinx, Inc.
*
* Author: Hyun Woo Kwon <[email protected]>
*/
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/dma/xilinx_dpdma.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <dt-bindings/dma/xlnx-zynqmp-dpdma.h>
#include "../dmaengine.h"
#include "../virt-dma.h"
/* DPDMA registers */
#define XILINX_DPDMA_ERR_CTRL 0x000
#define XILINX_DPDMA_ISR 0x004
#define XILINX_DPDMA_IMR 0x008
#define XILINX_DPDMA_IEN 0x00c
#define XILINX_DPDMA_IDS 0x010
#define XILINX_DPDMA_INTR_DESC_DONE(n) BIT((n) + 0)
#define XILINX_DPDMA_INTR_DESC_DONE_MASK GENMASK(5, 0)
#define XILINX_DPDMA_INTR_NO_OSTAND(n) BIT((n) + 6)
#define XILINX_DPDMA_INTR_NO_OSTAND_MASK GENMASK(11, 6)
#define XILINX_DPDMA_INTR_AXI_ERR(n) BIT((n) + 12)
#define XILINX_DPDMA_INTR_AXI_ERR_MASK GENMASK(17, 12)
#define XILINX_DPDMA_INTR_DESC_ERR(n) BIT((n) + 16)
#define XILINX_DPDMA_INTR_DESC_ERR_MASK GENMASK(23, 18)
#define XILINX_DPDMA_INTR_WR_CMD_FIFO_FULL BIT(24)
#define XILINX_DPDMA_INTR_WR_DATA_FIFO_FULL BIT(25)
#define XILINX_DPDMA_INTR_AXI_4K_CROSS BIT(26)
#define XILINX_DPDMA_INTR_VSYNC BIT(27)
#define XILINX_DPDMA_INTR_CHAN_ERR_MASK 0x00041000
#define XILINX_DPDMA_INTR_CHAN_ERR 0x00fff000
#define XILINX_DPDMA_INTR_GLOBAL_ERR 0x07000000
#define XILINX_DPDMA_INTR_ERR_ALL 0x07fff000
#define XILINX_DPDMA_INTR_CHAN_MASK 0x00041041
#define XILINX_DPDMA_INTR_GLOBAL_MASK 0x0f000000
#define XILINX_DPDMA_INTR_ALL 0x0fffffff
#define XILINX_DPDMA_EISR 0x014
#define XILINX_DPDMA_EIMR 0x018
#define XILINX_DPDMA_EIEN 0x01c
#define XILINX_DPDMA_EIDS 0x020
#define XILINX_DPDMA_EINTR_INV_APB BIT(0)
#define XILINX_DPDMA_EINTR_RD_AXI_ERR(n) BIT((n) + 1)
#define XILINX_DPDMA_EINTR_RD_AXI_ERR_MASK GENMASK(6, 1)
#define XILINX_DPDMA_EINTR_PRE_ERR(n) BIT((n) + 7)
#define XILINX_DPDMA_EINTR_PRE_ERR_MASK GENMASK(12, 7)
#define XILINX_DPDMA_EINTR_CRC_ERR(n) BIT((n) + 13)
#define XILINX_DPDMA_EINTR_CRC_ERR_MASK GENMASK(18, 13)
#define XILINX_DPDMA_EINTR_WR_AXI_ERR(n) BIT((n) + 19)
#define XILINX_DPDMA_EINTR_WR_AXI_ERR_MASK GENMASK(24, 19)
#define XILINX_DPDMA_EINTR_DESC_DONE_ERR(n) BIT((n) + 25)
#define XILINX_DPDMA_EINTR_DESC_DONE_ERR_MASK GENMASK(30, 25)
#define XILINX_DPDMA_EINTR_RD_CMD_FIFO_FULL BIT(32)
#define XILINX_DPDMA_EINTR_CHAN_ERR_MASK 0x02082082
#define XILINX_DPDMA_EINTR_CHAN_ERR 0x7ffffffe
#define XILINX_DPDMA_EINTR_GLOBAL_ERR 0x80000001
#define XILINX_DPDMA_EINTR_ALL 0xffffffff
#define XILINX_DPDMA_CNTL 0x100
#define XILINX_DPDMA_GBL 0x104
#define XILINX_DPDMA_GBL_TRIG_MASK(n) ((n) << 0)
#define XILINX_DPDMA_GBL_RETRIG_MASK(n) ((n) << 6)
#define XILINX_DPDMA_ALC0_CNTL 0x108
#define XILINX_DPDMA_ALC0_STATUS 0x10c
#define XILINX_DPDMA_ALC0_MAX 0x110
#define XILINX_DPDMA_ALC0_MIN 0x114
#define XILINX_DPDMA_ALC0_ACC 0x118
#define XILINX_DPDMA_ALC0_ACC_TRAN 0x11c
#define XILINX_DPDMA_ALC1_CNTL 0x120
#define XILINX_DPDMA_ALC1_STATUS 0x124
#define XILINX_DPDMA_ALC1_MAX 0x128
#define XILINX_DPDMA_ALC1_MIN 0x12c
#define XILINX_DPDMA_ALC1_ACC 0x130
#define XILINX_DPDMA_ALC1_ACC_TRAN 0x134
/* Channel register */
#define XILINX_DPDMA_CH_BASE 0x200
#define XILINX_DPDMA_CH_OFFSET 0x100
#define XILINX_DPDMA_CH_DESC_START_ADDRE 0x000
#define XILINX_DPDMA_CH_DESC_START_ADDRE_MASK GENMASK(15, 0)
#define XILINX_DPDMA_CH_DESC_START_ADDR 0x004
#define XILINX_DPDMA_CH_DESC_NEXT_ADDRE 0x008
#define XILINX_DPDMA_CH_DESC_NEXT_ADDR 0x00c
#define XILINX_DPDMA_CH_PYLD_CUR_ADDRE 0x010
#define XILINX_DPDMA_CH_PYLD_CUR_ADDR 0x014
#define XILINX_DPDMA_CH_CNTL 0x018
#define XILINX_DPDMA_CH_CNTL_ENABLE BIT(0)
#define XILINX_DPDMA_CH_CNTL_PAUSE BIT(1)
#define XILINX_DPDMA_CH_CNTL_QOS_DSCR_WR_MASK GENMASK(5, 2)
#define XILINX_DPDMA_CH_CNTL_QOS_DSCR_RD_MASK GENMASK(9, 6)
#define XILINX_DPDMA_CH_CNTL_QOS_DATA_RD_MASK GENMASK(13, 10)
#define XILINX_DPDMA_CH_CNTL_QOS_VID_CLASS 11
#define XILINX_DPDMA_CH_STATUS 0x01c
#define XILINX_DPDMA_CH_STATUS_OTRAN_CNT_MASK GENMASK(24, 21)
#define XILINX_DPDMA_CH_VDO 0x020
#define XILINX_DPDMA_CH_PYLD_SZ 0x024
#define XILINX_DPDMA_CH_DESC_ID 0x028
#define XILINX_DPDMA_CH_DESC_ID_MASK GENMASK(15, 0)
/* DPDMA descriptor fields */
#define XILINX_DPDMA_DESC_CONTROL_PREEMBLE 0xa5
#define XILINX_DPDMA_DESC_CONTROL_COMPLETE_INTR BIT(8)
#define XILINX_DPDMA_DESC_CONTROL_DESC_UPDATE BIT(9)
#define XILINX_DPDMA_DESC_CONTROL_IGNORE_DONE BIT(10)
#define XILINX_DPDMA_DESC_CONTROL_FRAG_MODE BIT(18)
#define XILINX_DPDMA_DESC_CONTROL_LAST BIT(19)
#define XILINX_DPDMA_DESC_CONTROL_ENABLE_CRC BIT(20)
#define XILINX_DPDMA_DESC_CONTROL_LAST_OF_FRAME BIT(21)
#define XILINX_DPDMA_DESC_ID_MASK GENMASK(15, 0)
#define XILINX_DPDMA_DESC_HSIZE_STRIDE_HSIZE_MASK GENMASK(17, 0)
#define XILINX_DPDMA_DESC_HSIZE_STRIDE_STRIDE_MASK GENMASK(31, 18)
#define XILINX_DPDMA_DESC_ADDR_EXT_NEXT_ADDR_MASK GENMASK(15, 0)
#define XILINX_DPDMA_DESC_ADDR_EXT_SRC_ADDR_MASK GENMASK(31, 16)
#define XILINX_DPDMA_ALIGN_BYTES 256
#define XILINX_DPDMA_LINESIZE_ALIGN_BITS 128
#define XILINX_DPDMA_NUM_CHAN 6
struct xilinx_dpdma_chan;
/**
* struct xilinx_dpdma_hw_desc - DPDMA hardware descriptor
* @control: control configuration field
* @desc_id: descriptor ID
* @xfer_size: transfer size
* @hsize_stride: horizontal size and stride
* @timestamp_lsb: LSB of time stamp
* @timestamp_msb: MSB of time stamp
* @addr_ext: upper 16 bit of 48 bit address (next_desc and src_addr)
* @next_desc: next descriptor 32 bit address
* @src_addr: payload source address (1st page, 32 LSB)
* @addr_ext_23: payload source address (3nd and 3rd pages, 16 LSBs)
* @addr_ext_45: payload source address (4th and 5th pages, 16 LSBs)
* @src_addr2: payload source address (2nd page, 32 LSB)
* @src_addr3: payload source address (3rd page, 32 LSB)
* @src_addr4: payload source address (4th page, 32 LSB)
* @src_addr5: payload source address (5th page, 32 LSB)
* @crc: descriptor CRC
*/
struct xilinx_dpdma_hw_desc {
u32 control;
u32 desc_id;
u32 xfer_size;
u32 hsize_stride;
u32 timestamp_lsb;
u32 timestamp_msb;
u32 addr_ext;
u32 next_desc;
u32 src_addr;
u32 addr_ext_23;
u32 addr_ext_45;
u32 src_addr2;
u32 src_addr3;
u32 src_addr4;
u32 src_addr5;
u32 crc;
} __aligned(XILINX_DPDMA_ALIGN_BYTES);
/**
* struct xilinx_dpdma_sw_desc - DPDMA software descriptor
* @hw: DPDMA hardware descriptor
* @node: list node for software descriptors
* @dma_addr: DMA address of the software descriptor
*/
struct xilinx_dpdma_sw_desc {
struct xilinx_dpdma_hw_desc hw;
struct list_head node;
dma_addr_t dma_addr;
};
/**
* struct xilinx_dpdma_tx_desc - DPDMA transaction descriptor
* @vdesc: virtual DMA descriptor
* @chan: DMA channel
* @descriptors: list of software descriptors
* @error: an error has been detected with this descriptor
*/
struct xilinx_dpdma_tx_desc {
struct virt_dma_desc vdesc;
struct xilinx_dpdma_chan *chan;
struct list_head descriptors;
bool error;
};
#define to_dpdma_tx_desc(_desc) \
container_of(_desc, struct xilinx_dpdma_tx_desc, vdesc)
/**
* struct xilinx_dpdma_chan - DPDMA channel
* @vchan: virtual DMA channel
* @reg: register base address
* @id: channel ID
* @wait_to_stop: queue to wait for outstanding transacitons before stopping
* @running: true if the channel is running
* @first_frame: flag for the first frame of stream
* @video_group: flag if multi-channel operation is needed for video channels
* @lock: lock to access struct xilinx_dpdma_chan
* @desc_pool: descriptor allocation pool
* @err_task: error IRQ bottom half handler
* @desc: References to descriptors being processed
* @desc.pending: Descriptor schedule to the hardware, pending execution
* @desc.active: Descriptor being executed by the hardware
* @xdev: DPDMA device
*/
struct xilinx_dpdma_chan {
struct virt_dma_chan vchan;
void __iomem *reg;
unsigned int id;
wait_queue_head_t wait_to_stop;
bool running;
bool first_frame;
bool video_group;
spinlock_t lock; /* lock to access struct xilinx_dpdma_chan */
struct dma_pool *desc_pool;
struct tasklet_struct err_task;
struct {
struct xilinx_dpdma_tx_desc *pending;
struct xilinx_dpdma_tx_desc *active;
} desc;
struct xilinx_dpdma_device *xdev;
};
#define to_xilinx_chan(_chan) \
container_of(_chan, struct xilinx_dpdma_chan, vchan.chan)
/**
* struct xilinx_dpdma_device - DPDMA device
* @common: generic dma device structure
* @reg: register base address
* @dev: generic device structure
* @irq: the interrupt number
* @axi_clk: axi clock
* @chan: DPDMA channels
* @ext_addr: flag for 64 bit system (48 bit addressing)
*/
struct xilinx_dpdma_device {
struct dma_device common;
void __iomem *reg;
struct device *dev;
int irq;
struct clk *axi_clk;
struct xilinx_dpdma_chan *chan[XILINX_DPDMA_NUM_CHAN];
bool ext_addr;
};
/* -----------------------------------------------------------------------------
* DebugFS
*/
#define XILINX_DPDMA_DEBUGFS_READ_MAX_SIZE 32
#define XILINX_DPDMA_DEBUGFS_UINT16_MAX_STR "65535"
/* Match xilinx_dpdma_testcases vs dpdma_debugfs_reqs[] entry */
enum xilinx_dpdma_testcases {
DPDMA_TC_INTR_DONE,
DPDMA_TC_NONE
};
struct xilinx_dpdma_debugfs {
enum xilinx_dpdma_testcases testcase;
u16 xilinx_dpdma_irq_done_count;
unsigned int chan_id;
};
static struct xilinx_dpdma_debugfs dpdma_debugfs;
struct xilinx_dpdma_debugfs_request {
const char *name;
enum xilinx_dpdma_testcases tc;
ssize_t (*read)(char *buf);
int (*write)(char *args);
};
static void xilinx_dpdma_debugfs_desc_done_irq(struct xilinx_dpdma_chan *chan)
{
if (IS_ENABLED(CONFIG_DEBUG_FS) && chan->id == dpdma_debugfs.chan_id)
dpdma_debugfs.xilinx_dpdma_irq_done_count++;
}
static ssize_t xilinx_dpdma_debugfs_desc_done_irq_read(char *buf)
{
size_t out_str_len;
dpdma_debugfs.testcase = DPDMA_TC_NONE;
out_str_len = strlen(XILINX_DPDMA_DEBUGFS_UINT16_MAX_STR);
out_str_len = min_t(size_t, XILINX_DPDMA_DEBUGFS_READ_MAX_SIZE,
out_str_len);
snprintf(buf, out_str_len, "%d",
dpdma_debugfs.xilinx_dpdma_irq_done_count);
return 0;
}
static int xilinx_dpdma_debugfs_desc_done_irq_write(char *args)
{
char *arg;
int ret;
u32 id;
arg = strsep(&args, " ");
if (!arg || strncasecmp(arg, "start", 5))
return -EINVAL;
arg = strsep(&args, " ");
if (!arg)
return -EINVAL;
ret = kstrtou32(arg, 0, &id);
if (ret < 0)
return ret;
if (id < ZYNQMP_DPDMA_VIDEO0 || id > ZYNQMP_DPDMA_AUDIO1)
return -EINVAL;
dpdma_debugfs.testcase = DPDMA_TC_INTR_DONE;
dpdma_debugfs.xilinx_dpdma_irq_done_count = 0;
dpdma_debugfs.chan_id = id;
return 0;
}
/* Match xilinx_dpdma_testcases vs dpdma_debugfs_reqs[] entry */
static struct xilinx_dpdma_debugfs_request dpdma_debugfs_reqs[] = {
{
.name = "DESCRIPTOR_DONE_INTR",
.tc = DPDMA_TC_INTR_DONE,
.read = xilinx_dpdma_debugfs_desc_done_irq_read,
.write = xilinx_dpdma_debugfs_desc_done_irq_write,
},
};
static ssize_t xilinx_dpdma_debugfs_read(struct file *f, char __user *buf,
size_t size, loff_t *pos)
{
enum xilinx_dpdma_testcases testcase;
char *kern_buff;
int ret = 0;
if (*pos != 0 || size <= 0)
return -EINVAL;
kern_buff = kzalloc(XILINX_DPDMA_DEBUGFS_READ_MAX_SIZE, GFP_KERNEL);
if (!kern_buff) {
dpdma_debugfs.testcase = DPDMA_TC_NONE;
return -ENOMEM;
}
testcase = READ_ONCE(dpdma_debugfs.testcase);
if (testcase != DPDMA_TC_NONE) {
ret = dpdma_debugfs_reqs[testcase].read(kern_buff);
if (ret < 0)
goto done;
} else {
strscpy(kern_buff, "No testcase executed",
XILINX_DPDMA_DEBUGFS_READ_MAX_SIZE);
}
size = min(size, strlen(kern_buff));
if (copy_to_user(buf, kern_buff, size))
ret = -EFAULT;
done:
kfree(kern_buff);
if (ret)
return ret;
*pos = size + 1;
return size;
}
static ssize_t xilinx_dpdma_debugfs_write(struct file *f,
const char __user *buf, size_t size,
loff_t *pos)
{
char *kern_buff, *kern_buff_start;
char *testcase;
unsigned int i;
int ret;
if (*pos != 0 || size <= 0)
return -EINVAL;
/* Supporting single instance of test as of now. */
if (dpdma_debugfs.testcase != DPDMA_TC_NONE)
return -EBUSY;
kern_buff = kzalloc(size, GFP_KERNEL);
if (!kern_buff)
return -ENOMEM;
kern_buff_start = kern_buff;
ret = strncpy_from_user(kern_buff, buf, size);
if (ret < 0)
goto done;
/* Read the testcase name from a user request. */
testcase = strsep(&kern_buff, " ");
for (i = 0; i < ARRAY_SIZE(dpdma_debugfs_reqs); i++) {
if (!strcasecmp(testcase, dpdma_debugfs_reqs[i].name))
break;
}
if (i == ARRAY_SIZE(dpdma_debugfs_reqs)) {
ret = -EINVAL;
goto done;
}
ret = dpdma_debugfs_reqs[i].write(kern_buff);
if (ret < 0)
goto done;
ret = size;
done:
kfree(kern_buff_start);
return ret;
}
static const struct file_operations fops_xilinx_dpdma_dbgfs = {
.owner = THIS_MODULE,
.read = xilinx_dpdma_debugfs_read,
.write = xilinx_dpdma_debugfs_write,
};
static void xilinx_dpdma_debugfs_init(struct xilinx_dpdma_device *xdev)
{
struct dentry *dent;
dpdma_debugfs.testcase = DPDMA_TC_NONE;
dent = debugfs_create_file("testcase", 0444, xdev->common.dbg_dev_root,
NULL, &fops_xilinx_dpdma_dbgfs);
if (IS_ERR(dent))
dev_err(xdev->dev, "Failed to create debugfs testcase file\n");
}
/* -----------------------------------------------------------------------------
* I/O Accessors
*/
static inline u32 dpdma_read(void __iomem *base, u32 offset)
{
return ioread32(base + offset);
}
static inline void dpdma_write(void __iomem *base, u32 offset, u32 val)
{
iowrite32(val, base + offset);
}
static inline void dpdma_clr(void __iomem *base, u32 offset, u32 clr)
{
dpdma_write(base, offset, dpdma_read(base, offset) & ~clr);
}
static inline void dpdma_set(void __iomem *base, u32 offset, u32 set)
{
dpdma_write(base, offset, dpdma_read(base, offset) | set);
}
/* -----------------------------------------------------------------------------
* Descriptor Operations
*/
/**
* xilinx_dpdma_sw_desc_set_dma_addrs - Set DMA addresses in the descriptor
* @xdev: DPDMA device
* @sw_desc: The software descriptor in which to set DMA addresses
* @prev: The previous descriptor
* @dma_addr: array of dma addresses
* @num_src_addr: number of addresses in @dma_addr
*
* Set all the DMA addresses in the hardware descriptor corresponding to @dev
* from @dma_addr. If a previous descriptor is specified in @prev, its next
* descriptor DMA address is set to the DMA address of @sw_desc. @prev may be
* identical to @sw_desc for cyclic transfers.
*/
static void xilinx_dpdma_sw_desc_set_dma_addrs(struct xilinx_dpdma_device *xdev,
struct xilinx_dpdma_sw_desc *sw_desc,
struct xilinx_dpdma_sw_desc *prev,
dma_addr_t dma_addr[],
unsigned int num_src_addr)
{
struct xilinx_dpdma_hw_desc *hw_desc = &sw_desc->hw;
unsigned int i;
hw_desc->src_addr = lower_32_bits(dma_addr[0]);
if (xdev->ext_addr)
hw_desc->addr_ext |=
FIELD_PREP(XILINX_DPDMA_DESC_ADDR_EXT_SRC_ADDR_MASK,
upper_32_bits(dma_addr[0]));
for (i = 1; i < num_src_addr; i++) {
u32 *addr = &hw_desc->src_addr2;
addr[i - 1] = lower_32_bits(dma_addr[i]);
if (xdev->ext_addr) {
u32 *addr_ext = &hw_desc->addr_ext_23;
u32 addr_msb;
addr_msb = upper_32_bits(dma_addr[i]) & GENMASK(15, 0);
addr_msb <<= 16 * ((i - 1) % 2);
addr_ext[(i - 1) / 2] |= addr_msb;
}
}
if (!prev)
return;
prev->hw.next_desc = lower_32_bits(sw_desc->dma_addr);
if (xdev->ext_addr)
prev->hw.addr_ext |=
FIELD_PREP(XILINX_DPDMA_DESC_ADDR_EXT_NEXT_ADDR_MASK,
upper_32_bits(sw_desc->dma_addr));
}
/**
* xilinx_dpdma_chan_alloc_sw_desc - Allocate a software descriptor
* @chan: DPDMA channel
*
* Allocate a software descriptor from the channel's descriptor pool.
*
* Return: a software descriptor or NULL.
*/
static struct xilinx_dpdma_sw_desc *
xilinx_dpdma_chan_alloc_sw_desc(struct xilinx_dpdma_chan *chan)
{
struct xilinx_dpdma_sw_desc *sw_desc;
dma_addr_t dma_addr;
sw_desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &dma_addr);
if (!sw_desc)
return NULL;
sw_desc->dma_addr = dma_addr;
return sw_desc;
}
/**
* xilinx_dpdma_chan_free_sw_desc - Free a software descriptor
* @chan: DPDMA channel
* @sw_desc: software descriptor to free
*
* Free a software descriptor from the channel's descriptor pool.
*/
static void
xilinx_dpdma_chan_free_sw_desc(struct xilinx_dpdma_chan *chan,
struct xilinx_dpdma_sw_desc *sw_desc)
{
dma_pool_free(chan->desc_pool, sw_desc, sw_desc->dma_addr);
}
/**
* xilinx_dpdma_chan_dump_tx_desc - Dump a tx descriptor
* @chan: DPDMA channel
* @tx_desc: tx descriptor to dump
*
* Dump contents of a tx descriptor
*/
static void xilinx_dpdma_chan_dump_tx_desc(struct xilinx_dpdma_chan *chan,
struct xilinx_dpdma_tx_desc *tx_desc)
{
struct xilinx_dpdma_sw_desc *sw_desc;
struct device *dev = chan->xdev->dev;
unsigned int i = 0;
dev_dbg(dev, "------- TX descriptor dump start -------\n");
dev_dbg(dev, "------- channel ID = %d -------\n", chan->id);
list_for_each_entry(sw_desc, &tx_desc->descriptors, node) {
struct xilinx_dpdma_hw_desc *hw_desc = &sw_desc->hw;
dev_dbg(dev, "------- HW descriptor %d -------\n", i++);
dev_dbg(dev, "descriptor DMA addr: %pad\n", &sw_desc->dma_addr);
dev_dbg(dev, "control: 0x%08x\n", hw_desc->control);
dev_dbg(dev, "desc_id: 0x%08x\n", hw_desc->desc_id);
dev_dbg(dev, "xfer_size: 0x%08x\n", hw_desc->xfer_size);
dev_dbg(dev, "hsize_stride: 0x%08x\n", hw_desc->hsize_stride);
dev_dbg(dev, "timestamp_lsb: 0x%08x\n", hw_desc->timestamp_lsb);
dev_dbg(dev, "timestamp_msb: 0x%08x\n", hw_desc->timestamp_msb);
dev_dbg(dev, "addr_ext: 0x%08x\n", hw_desc->addr_ext);
dev_dbg(dev, "next_desc: 0x%08x\n", hw_desc->next_desc);
dev_dbg(dev, "src_addr: 0x%08x\n", hw_desc->src_addr);
dev_dbg(dev, "addr_ext_23: 0x%08x\n", hw_desc->addr_ext_23);
dev_dbg(dev, "addr_ext_45: 0x%08x\n", hw_desc->addr_ext_45);
dev_dbg(dev, "src_addr2: 0x%08x\n", hw_desc->src_addr2);
dev_dbg(dev, "src_addr3: 0x%08x\n", hw_desc->src_addr3);
dev_dbg(dev, "src_addr4: 0x%08x\n", hw_desc->src_addr4);
dev_dbg(dev, "src_addr5: 0x%08x\n", hw_desc->src_addr5);
dev_dbg(dev, "crc: 0x%08x\n", hw_desc->crc);
}
dev_dbg(dev, "------- TX descriptor dump end -------\n");
}
/**
* xilinx_dpdma_chan_alloc_tx_desc - Allocate a transaction descriptor
* @chan: DPDMA channel
*
* Allocate a tx descriptor.
*
* Return: a tx descriptor or NULL.
*/
static struct xilinx_dpdma_tx_desc *
xilinx_dpdma_chan_alloc_tx_desc(struct xilinx_dpdma_chan *chan)
{
struct xilinx_dpdma_tx_desc *tx_desc;
tx_desc = kzalloc(sizeof(*tx_desc), GFP_NOWAIT);
if (!tx_desc)
return NULL;
INIT_LIST_HEAD(&tx_desc->descriptors);
tx_desc->chan = chan;
tx_desc->error = false;
return tx_desc;
}
/**
* xilinx_dpdma_chan_free_tx_desc - Free a virtual DMA descriptor
* @vdesc: virtual DMA descriptor
*
* Free the virtual DMA descriptor @vdesc including its software descriptors.
*/
static void xilinx_dpdma_chan_free_tx_desc(struct virt_dma_desc *vdesc)
{
struct xilinx_dpdma_sw_desc *sw_desc, *next;
struct xilinx_dpdma_tx_desc *desc;
if (!vdesc)
return;
desc = to_dpdma_tx_desc(vdesc);
list_for_each_entry_safe(sw_desc, next, &desc->descriptors, node) {
list_del(&sw_desc->node);
xilinx_dpdma_chan_free_sw_desc(desc->chan, sw_desc);
}
kfree(desc);
}
/**
* xilinx_dpdma_chan_prep_interleaved_dma - Prepare an interleaved dma
* descriptor
* @chan: DPDMA channel
* @xt: dma interleaved template
*
* Prepare a tx descriptor including internal software/hardware descriptors
* based on @xt.
*
* Return: A DPDMA TX descriptor on success, or NULL.
*/
static struct xilinx_dpdma_tx_desc *
xilinx_dpdma_chan_prep_interleaved_dma(struct xilinx_dpdma_chan *chan,
struct dma_interleaved_template *xt)
{
struct xilinx_dpdma_tx_desc *tx_desc;
struct xilinx_dpdma_sw_desc *sw_desc;
struct xilinx_dpdma_hw_desc *hw_desc;
size_t hsize = xt->sgl[0].size;
size_t stride = hsize + xt->sgl[0].icg;
if (!IS_ALIGNED(xt->src_start, XILINX_DPDMA_ALIGN_BYTES)) {
dev_err(chan->xdev->dev,
"chan%u: buffer should be aligned at %d B\n",
chan->id, XILINX_DPDMA_ALIGN_BYTES);
return NULL;
}
tx_desc = xilinx_dpdma_chan_alloc_tx_desc(chan);
if (!tx_desc)
return NULL;
sw_desc = xilinx_dpdma_chan_alloc_sw_desc(chan);
if (!sw_desc) {
xilinx_dpdma_chan_free_tx_desc(&tx_desc->vdesc);
return NULL;
}
xilinx_dpdma_sw_desc_set_dma_addrs(chan->xdev, sw_desc, sw_desc,
&xt->src_start, 1);
hw_desc = &sw_desc->hw;
hsize = ALIGN(hsize, XILINX_DPDMA_LINESIZE_ALIGN_BITS / 8);
hw_desc->xfer_size = hsize * xt->numf;
hw_desc->hsize_stride =
FIELD_PREP(XILINX_DPDMA_DESC_HSIZE_STRIDE_HSIZE_MASK, hsize) |
FIELD_PREP(XILINX_DPDMA_DESC_HSIZE_STRIDE_STRIDE_MASK,
stride / 16);
hw_desc->control |= XILINX_DPDMA_DESC_CONTROL_PREEMBLE;
hw_desc->control |= XILINX_DPDMA_DESC_CONTROL_COMPLETE_INTR;
hw_desc->control |= XILINX_DPDMA_DESC_CONTROL_IGNORE_DONE;
hw_desc->control |= XILINX_DPDMA_DESC_CONTROL_LAST_OF_FRAME;
list_add_tail(&sw_desc->node, &tx_desc->descriptors);
return tx_desc;
}
/* -----------------------------------------------------------------------------
* DPDMA Channel Operations
*/
/**
* xilinx_dpdma_chan_enable - Enable the channel
* @chan: DPDMA channel
*
* Enable the channel and its interrupts. Set the QoS values for video class.
*/
static void xilinx_dpdma_chan_enable(struct xilinx_dpdma_chan *chan)
{
u32 reg;
reg = (XILINX_DPDMA_INTR_CHAN_MASK << chan->id)
| XILINX_DPDMA_INTR_GLOBAL_MASK;
dpdma_write(chan->xdev->reg, XILINX_DPDMA_IEN, reg);
reg = (XILINX_DPDMA_EINTR_CHAN_ERR_MASK << chan->id)
| XILINX_DPDMA_INTR_GLOBAL_ERR;
dpdma_write(chan->xdev->reg, XILINX_DPDMA_EIEN, reg);
reg = XILINX_DPDMA_CH_CNTL_ENABLE
| FIELD_PREP(XILINX_DPDMA_CH_CNTL_QOS_DSCR_WR_MASK,
XILINX_DPDMA_CH_CNTL_QOS_VID_CLASS)
| FIELD_PREP(XILINX_DPDMA_CH_CNTL_QOS_DSCR_RD_MASK,
XILINX_DPDMA_CH_CNTL_QOS_VID_CLASS)
| FIELD_PREP(XILINX_DPDMA_CH_CNTL_QOS_DATA_RD_MASK,
XILINX_DPDMA_CH_CNTL_QOS_VID_CLASS);
dpdma_set(chan->reg, XILINX_DPDMA_CH_CNTL, reg);
}
/**
* xilinx_dpdma_chan_disable - Disable the channel
* @chan: DPDMA channel
*
* Disable the channel and its interrupts.
*/
static void xilinx_dpdma_chan_disable(struct xilinx_dpdma_chan *chan)
{
u32 reg;
reg = XILINX_DPDMA_INTR_CHAN_MASK << chan->id;
dpdma_write(chan->xdev->reg, XILINX_DPDMA_IEN, reg);
reg = XILINX_DPDMA_EINTR_CHAN_ERR_MASK << chan->id;
dpdma_write(chan->xdev->reg, XILINX_DPDMA_EIEN, reg);
dpdma_clr(chan->reg, XILINX_DPDMA_CH_CNTL, XILINX_DPDMA_CH_CNTL_ENABLE);
}
/**
* xilinx_dpdma_chan_pause - Pause the channel
* @chan: DPDMA channel
*
* Pause the channel.
*/
static void xilinx_dpdma_chan_pause(struct xilinx_dpdma_chan *chan)
{
dpdma_set(chan->reg, XILINX_DPDMA_CH_CNTL, XILINX_DPDMA_CH_CNTL_PAUSE);
}
/**
* xilinx_dpdma_chan_unpause - Unpause the channel
* @chan: DPDMA channel
*
* Unpause the channel.
*/
static void xilinx_dpdma_chan_unpause(struct xilinx_dpdma_chan *chan)
{
dpdma_clr(chan->reg, XILINX_DPDMA_CH_CNTL, XILINX_DPDMA_CH_CNTL_PAUSE);
}
static u32 xilinx_dpdma_chan_video_group_ready(struct xilinx_dpdma_chan *chan)
{
struct xilinx_dpdma_device *xdev = chan->xdev;
u32 channels = 0;
unsigned int i;
for (i = ZYNQMP_DPDMA_VIDEO0; i <= ZYNQMP_DPDMA_VIDEO2; i++) {
if (xdev->chan[i]->video_group && !xdev->chan[i]->running)
return 0;
if (xdev->chan[i]->video_group)
channels |= BIT(i);
}
return channels;
}
/**
* xilinx_dpdma_chan_queue_transfer - Queue the next transfer
* @chan: DPDMA channel
*
* Queue the next descriptor, if any, to the hardware. If the channel is
* stopped, start it first. Otherwise retrigger it with the next descriptor.
*/
static void xilinx_dpdma_chan_queue_transfer(struct xilinx_dpdma_chan *chan)
{
struct xilinx_dpdma_device *xdev = chan->xdev;
struct xilinx_dpdma_sw_desc *sw_desc;
struct xilinx_dpdma_tx_desc *desc;
struct virt_dma_desc *vdesc;
u32 reg, channels;
bool first_frame;
lockdep_assert_held(&chan->lock);
if (chan->desc.pending)
return;
if (!chan->running) {
xilinx_dpdma_chan_unpause(chan);
xilinx_dpdma_chan_enable(chan);
chan->first_frame = true;
chan->running = true;
}
vdesc = vchan_next_desc(&chan->vchan);
if (!vdesc)
return;
desc = to_dpdma_tx_desc(vdesc);
chan->desc.pending = desc;
list_del(&desc->vdesc.node);
/*
* Assign the cookie to descriptors in this transaction. Only 16 bit
* will be used, but it should be enough.
*/
list_for_each_entry(sw_desc, &desc->descriptors, node)
sw_desc->hw.desc_id = desc->vdesc.tx.cookie
& XILINX_DPDMA_CH_DESC_ID_MASK;
sw_desc = list_first_entry(&desc->descriptors,
struct xilinx_dpdma_sw_desc, node);
dpdma_write(chan->reg, XILINX_DPDMA_CH_DESC_START_ADDR,
lower_32_bits(sw_desc->dma_addr));
if (xdev->ext_addr)
dpdma_write(chan->reg, XILINX_DPDMA_CH_DESC_START_ADDRE,
FIELD_PREP(XILINX_DPDMA_CH_DESC_START_ADDRE_MASK,
upper_32_bits(sw_desc->dma_addr)));
first_frame = chan->first_frame;
chan->first_frame = false;
if (chan->video_group) {
channels = xilinx_dpdma_chan_video_group_ready(chan);
/*
* Trigger the transfer only when all channels in the group are
* ready.
*/
if (!channels)
return;
} else {
channels = BIT(chan->id);
}
if (first_frame)
reg = XILINX_DPDMA_GBL_TRIG_MASK(channels);
else
reg = XILINX_DPDMA_GBL_RETRIG_MASK(channels);
dpdma_write(xdev->reg, XILINX_DPDMA_GBL, reg);
}
/**
* xilinx_dpdma_chan_ostand - Number of outstanding transactions
* @chan: DPDMA channel
*
* Read and return the number of outstanding transactions from register.
*
* Return: Number of outstanding transactions from the status register.
*/
static u32 xilinx_dpdma_chan_ostand(struct xilinx_dpdma_chan *chan)
{
return FIELD_GET(XILINX_DPDMA_CH_STATUS_OTRAN_CNT_MASK,
dpdma_read(chan->reg, XILINX_DPDMA_CH_STATUS));
}
/**
* xilinx_dpdma_chan_notify_no_ostand - Notify no outstanding transaction event
* @chan: DPDMA channel
*
* Notify waiters for no outstanding event, so waiters can stop the channel
* safely. This function is supposed to be called when 'no outstanding'
* interrupt is generated. The 'no outstanding' interrupt is disabled and
* should be re-enabled when this event is handled. If the channel status
* register still shows some number of outstanding transactions, the interrupt
* remains enabled.
*
* Return: 0 on success. On failure, -EWOULDBLOCK if there's still outstanding
* transaction(s).
*/
static int xilinx_dpdma_chan_notify_no_ostand(struct xilinx_dpdma_chan *chan)
{
u32 cnt;
cnt = xilinx_dpdma_chan_ostand(chan);
if (cnt) {
dev_dbg(chan->xdev->dev,
"chan%u: %d outstanding transactions\n",
chan->id, cnt);
return -EWOULDBLOCK;
}
/* Disable 'no outstanding' interrupt */
dpdma_write(chan->xdev->reg, XILINX_DPDMA_IDS,
XILINX_DPDMA_INTR_NO_OSTAND(chan->id));
wake_up(&chan->wait_to_stop);
return 0;
}
/**
* xilinx_dpdma_chan_wait_no_ostand - Wait for the no outstanding irq
* @chan: DPDMA channel
*
* Wait for the no outstanding transaction interrupt. This functions can sleep
* for 50ms.
*
* Return: 0 on success. On failure, -ETIMEOUT for time out, or the error code
* from wait_event_interruptible_timeout().
*/
static int xilinx_dpdma_chan_wait_no_ostand(struct xilinx_dpdma_chan *chan)
{
int ret;
/* Wait for a no outstanding transaction interrupt upto 50msec */
ret = wait_event_interruptible_timeout(chan->wait_to_stop,
!xilinx_dpdma_chan_ostand(chan),
msecs_to_jiffies(50));
if (ret > 0) {
dpdma_write(chan->xdev->reg, XILINX_DPDMA_IEN,
XILINX_DPDMA_INTR_NO_OSTAND(chan->id));
return 0;
}
dev_err(chan->xdev->dev, "chan%u: not ready to stop: %d trans\n",
chan->id, xilinx_dpdma_chan_ostand(chan));
if (ret == 0)
return -ETIMEDOUT;
return ret;
}
/**
* xilinx_dpdma_chan_poll_no_ostand - Poll the outstanding transaction status
* @chan: DPDMA channel
*
* Poll the outstanding transaction status, and return when there's no
* outstanding transaction. This functions can be used in the interrupt context
* or where the atomicity is required. Calling thread may wait more than 50ms.
*
* Return: 0 on success, or -ETIMEDOUT.
*/
static int xilinx_dpdma_chan_poll_no_ostand(struct xilinx_dpdma_chan *chan)
{
u32 cnt, loop = 50000;
/* Poll at least for 50ms (20 fps). */
do {
cnt = xilinx_dpdma_chan_ostand(chan);
udelay(1);
} while (loop-- > 0 && cnt);
if (loop) {
dpdma_write(chan->xdev->reg, XILINX_DPDMA_IEN,
XILINX_DPDMA_INTR_NO_OSTAND(chan->id));
return 0;
}
dev_err(chan->xdev->dev, "chan%u: not ready to stop: %d trans\n",
chan->id, xilinx_dpdma_chan_ostand(chan));
return -ETIMEDOUT;
}
/**
* xilinx_dpdma_chan_stop - Stop the channel
* @chan: DPDMA channel
*
* Stop a previously paused channel by first waiting for completion of all
* outstanding transaction and then disabling the channel.
*
* Return: 0 on success, or -ETIMEDOUT if the channel failed to stop.
*/
static int xilinx_dpdma_chan_stop(struct xilinx_dpdma_chan *chan)
{
unsigned long flags;
int ret;
ret = xilinx_dpdma_chan_wait_no_ostand(chan);
if (ret)
return ret;
spin_lock_irqsave(&chan->lock, flags);
xilinx_dpdma_chan_disable(chan);
chan->running = false;
spin_unlock_irqrestore(&chan->lock, flags);
return 0;
}
/**
* xilinx_dpdma_chan_done_irq - Handle hardware descriptor completion
* @chan: DPDMA channel
*
* Handle completion of the currently active descriptor (@chan->desc.active). As
* we currently support cyclic transfers only, this just invokes the cyclic
* callback. The descriptor will be completed at the VSYNC interrupt when a new
* descriptor replaces it.
*/
static void xilinx_dpdma_chan_done_irq(struct xilinx_dpdma_chan *chan)
{
struct xilinx_dpdma_tx_desc *active;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
xilinx_dpdma_debugfs_desc_done_irq(chan);
active = chan->desc.active;
if (active)
vchan_cyclic_callback(&active->vdesc);
else
dev_warn(chan->xdev->dev,
"chan%u: DONE IRQ with no active descriptor!\n",
chan->id);
spin_unlock_irqrestore(&chan->lock, flags);
}
/**
* xilinx_dpdma_chan_vsync_irq - Handle hardware descriptor scheduling
* @chan: DPDMA channel
*
* At VSYNC the active descriptor may have been replaced by the pending
* descriptor. Detect this through the DESC_ID and perform appropriate
* bookkeeping.
*/
static void xilinx_dpdma_chan_vsync_irq(struct xilinx_dpdma_chan *chan)
{
struct xilinx_dpdma_tx_desc *pending;
struct xilinx_dpdma_sw_desc *sw_desc;
unsigned long flags;
u32 desc_id;
spin_lock_irqsave(&chan->lock, flags);
pending = chan->desc.pending;
if (!chan->running || !pending)
goto out;
desc_id = dpdma_read(chan->reg, XILINX_DPDMA_CH_DESC_ID)
& XILINX_DPDMA_CH_DESC_ID_MASK;
/* If the retrigger raced with vsync, retry at the next frame. */
sw_desc = list_first_entry(&pending->descriptors,
struct xilinx_dpdma_sw_desc, node);
if (sw_desc->hw.desc_id != desc_id) {
dev_dbg(chan->xdev->dev,
"chan%u: vsync race lost (%u != %u), retrying\n",
chan->id, sw_desc->hw.desc_id, desc_id);
goto out;
}
/*
* Complete the active descriptor, if any, promote the pending
* descriptor to active, and queue the next transfer, if any.
*/
if (chan->desc.active)
vchan_cookie_complete(&chan->desc.active->vdesc);
chan->desc.active = pending;
chan->desc.pending = NULL;
xilinx_dpdma_chan_queue_transfer(chan);
out:
spin_unlock_irqrestore(&chan->lock, flags);
}
/**
* xilinx_dpdma_chan_err - Detect any channel error
* @chan: DPDMA channel
* @isr: masked Interrupt Status Register
* @eisr: Error Interrupt Status Register
*
* Return: true if any channel error occurs, or false otherwise.
*/
static bool
xilinx_dpdma_chan_err(struct xilinx_dpdma_chan *chan, u32 isr, u32 eisr)
{
if (!chan)
return false;
if (chan->running &&
((isr & (XILINX_DPDMA_INTR_CHAN_ERR_MASK << chan->id)) ||
(eisr & (XILINX_DPDMA_EINTR_CHAN_ERR_MASK << chan->id))))
return true;
return false;
}
/**
* xilinx_dpdma_chan_handle_err - DPDMA channel error handling
* @chan: DPDMA channel
*
* This function is called when any channel error or any global error occurs.
* The function disables the paused channel by errors and determines
* if the current active descriptor can be rescheduled depending on
* the descriptor status.
*/
static void xilinx_dpdma_chan_handle_err(struct xilinx_dpdma_chan *chan)
{
struct xilinx_dpdma_device *xdev = chan->xdev;
struct xilinx_dpdma_tx_desc *active;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
dev_dbg(xdev->dev, "chan%u: cur desc addr = 0x%04x%08x\n",
chan->id,
dpdma_read(chan->reg, XILINX_DPDMA_CH_DESC_START_ADDRE),
dpdma_read(chan->reg, XILINX_DPDMA_CH_DESC_START_ADDR));
dev_dbg(xdev->dev, "chan%u: cur payload addr = 0x%04x%08x\n",
chan->id,
dpdma_read(chan->reg, XILINX_DPDMA_CH_PYLD_CUR_ADDRE),
dpdma_read(chan->reg, XILINX_DPDMA_CH_PYLD_CUR_ADDR));
xilinx_dpdma_chan_disable(chan);
chan->running = false;
if (!chan->desc.active)
goto out_unlock;
active = chan->desc.active;
chan->desc.active = NULL;
xilinx_dpdma_chan_dump_tx_desc(chan, active);
if (active->error)
dev_dbg(xdev->dev, "chan%u: repeated error on desc\n",
chan->id);
/* Reschedule if there's no new descriptor */
if (!chan->desc.pending &&
list_empty(&chan->vchan.desc_issued)) {
active->error = true;
list_add_tail(&active->vdesc.node,
&chan->vchan.desc_issued);
} else {
xilinx_dpdma_chan_free_tx_desc(&active->vdesc);
}
out_unlock:
spin_unlock_irqrestore(&chan->lock, flags);
}
/* -----------------------------------------------------------------------------
* DMA Engine Operations
*/
static struct dma_async_tx_descriptor *
xilinx_dpdma_prep_interleaved_dma(struct dma_chan *dchan,
struct dma_interleaved_template *xt,
unsigned long flags)
{
struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dpdma_tx_desc *desc;
if (xt->dir != DMA_MEM_TO_DEV)
return NULL;
if (!xt->numf || !xt->sgl[0].size)
return NULL;
if (!(flags & DMA_PREP_REPEAT) || !(flags & DMA_PREP_LOAD_EOT))
return NULL;
desc = xilinx_dpdma_chan_prep_interleaved_dma(chan, xt);
if (!desc)
return NULL;
vchan_tx_prep(&chan->vchan, &desc->vdesc, flags | DMA_CTRL_ACK);
return &desc->vdesc.tx;
}
/**
* xilinx_dpdma_alloc_chan_resources - Allocate resources for the channel
* @dchan: DMA channel
*
* Allocate a descriptor pool for the channel.
*
* Return: 0 on success, or -ENOMEM if failed to allocate a pool.
*/
static int xilinx_dpdma_alloc_chan_resources(struct dma_chan *dchan)
{
struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
size_t align = __alignof__(struct xilinx_dpdma_sw_desc);
chan->desc_pool = dma_pool_create(dev_name(chan->xdev->dev),
chan->xdev->dev,
sizeof(struct xilinx_dpdma_sw_desc),
align, 0);
if (!chan->desc_pool) {
dev_err(chan->xdev->dev,
"chan%u: failed to allocate a descriptor pool\n",
chan->id);
return -ENOMEM;
}
return 0;
}
/**
* xilinx_dpdma_free_chan_resources - Free all resources for the channel
* @dchan: DMA channel
*
* Free resources associated with the virtual DMA channel, and destroy the
* descriptor pool.
*/
static void xilinx_dpdma_free_chan_resources(struct dma_chan *dchan)
{
struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
vchan_free_chan_resources(&chan->vchan);
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
}
static void xilinx_dpdma_issue_pending(struct dma_chan *dchan)
{
struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
unsigned long flags;
spin_lock_irqsave(&chan->vchan.lock, flags);
if (vchan_issue_pending(&chan->vchan))
xilinx_dpdma_chan_queue_transfer(chan);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
}
static int xilinx_dpdma_config(struct dma_chan *dchan,
struct dma_slave_config *config)
{
struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dpdma_peripheral_config *pconfig;
unsigned long flags;
/*
* The destination address doesn't need to be specified as the DPDMA is
* hardwired to the destination (the DP controller). The transfer
* width, burst size and port window size are thus meaningless, they're
* fixed both on the DPDMA side and on the DP controller side.
*/
/*
* Use the peripheral_config to indicate that the channel is part
* of a video group. This requires matching use of the custom
* structure in each driver.
*/
pconfig = config->peripheral_config;
if (WARN_ON(pconfig && config->peripheral_size != sizeof(*pconfig)))
return -EINVAL;
spin_lock_irqsave(&chan->lock, flags);
if (chan->id <= ZYNQMP_DPDMA_VIDEO2 && pconfig)
chan->video_group = pconfig->video_group;
spin_unlock_irqrestore(&chan->lock, flags);
return 0;
}
static int xilinx_dpdma_pause(struct dma_chan *dchan)
{
xilinx_dpdma_chan_pause(to_xilinx_chan(dchan));
return 0;
}
static int xilinx_dpdma_resume(struct dma_chan *dchan)
{
xilinx_dpdma_chan_unpause(to_xilinx_chan(dchan));
return 0;
}
/**
* xilinx_dpdma_terminate_all - Terminate the channel and descriptors
* @dchan: DMA channel
*
* Pause the channel without waiting for ongoing transfers to complete. Waiting
* for completion is performed by xilinx_dpdma_synchronize() that will disable
* the channel to complete the stop.
*
* All the descriptors associated with the channel that are guaranteed not to
* be touched by the hardware. The pending and active descriptor are not
* touched, and will be freed either upon completion, or by
* xilinx_dpdma_synchronize().
*
* Return: 0 on success, or -ETIMEDOUT if the channel failed to stop.
*/
static int xilinx_dpdma_terminate_all(struct dma_chan *dchan)
{
struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dpdma_device *xdev = chan->xdev;
LIST_HEAD(descriptors);
unsigned long flags;
unsigned int i;
/* Pause the channel (including the whole video group if applicable). */
if (chan->video_group) {
for (i = ZYNQMP_DPDMA_VIDEO0; i <= ZYNQMP_DPDMA_VIDEO2; i++) {
if (xdev->chan[i]->video_group &&
xdev->chan[i]->running) {
xilinx_dpdma_chan_pause(xdev->chan[i]);
xdev->chan[i]->video_group = false;
}
}
} else {
xilinx_dpdma_chan_pause(chan);
}
/* Gather all the descriptors we can free and free them. */
spin_lock_irqsave(&chan->vchan.lock, flags);
vchan_get_all_descriptors(&chan->vchan, &descriptors);
spin_unlock_irqrestore(&chan->vchan.lock, flags);
vchan_dma_desc_free_list(&chan->vchan, &descriptors);
return 0;
}
/**
* xilinx_dpdma_synchronize - Synchronize callback execution
* @dchan: DMA channel
*
* Synchronizing callback execution ensures that all previously issued
* transfers have completed and all associated callbacks have been called and
* have returned.
*
* This function waits for the DMA channel to stop. It assumes it has been
* paused by a previous call to dmaengine_terminate_async(), and that no new
* pending descriptors have been issued with dma_async_issue_pending(). The
* behaviour is undefined otherwise.
*/
static void xilinx_dpdma_synchronize(struct dma_chan *dchan)
{
struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
unsigned long flags;
xilinx_dpdma_chan_stop(chan);
spin_lock_irqsave(&chan->vchan.lock, flags);
if (chan->desc.pending) {
vchan_terminate_vdesc(&chan->desc.pending->vdesc);
chan->desc.pending = NULL;
}
if (chan->desc.active) {
vchan_terminate_vdesc(&chan->desc.active->vdesc);
chan->desc.active = NULL;
}
spin_unlock_irqrestore(&chan->vchan.lock, flags);
vchan_synchronize(&chan->vchan);
}
/* -----------------------------------------------------------------------------
* Interrupt and Tasklet Handling
*/
/**
* xilinx_dpdma_err - Detect any global error
* @isr: Interrupt Status Register
* @eisr: Error Interrupt Status Register
*
* Return: True if any global error occurs, or false otherwise.
*/
static bool xilinx_dpdma_err(u32 isr, u32 eisr)
{
if (isr & XILINX_DPDMA_INTR_GLOBAL_ERR ||
eisr & XILINX_DPDMA_EINTR_GLOBAL_ERR)
return true;
return false;
}
/**
* xilinx_dpdma_handle_err_irq - Handle DPDMA error interrupt
* @xdev: DPDMA device
* @isr: masked Interrupt Status Register
* @eisr: Error Interrupt Status Register
*
* Handle if any error occurs based on @isr and @eisr. This function disables
* corresponding error interrupts, and those should be re-enabled once handling
* is done.
*/
static void xilinx_dpdma_handle_err_irq(struct xilinx_dpdma_device *xdev,
u32 isr, u32 eisr)
{
bool err = xilinx_dpdma_err(isr, eisr);
unsigned int i;
dev_dbg_ratelimited(xdev->dev,
"error irq: isr = 0x%08x, eisr = 0x%08x\n",
isr, eisr);
/* Disable channel error interrupts until errors are handled. */
dpdma_write(xdev->reg, XILINX_DPDMA_IDS,
isr & ~XILINX_DPDMA_INTR_GLOBAL_ERR);
dpdma_write(xdev->reg, XILINX_DPDMA_EIDS,
eisr & ~XILINX_DPDMA_EINTR_GLOBAL_ERR);
for (i = 0; i < ARRAY_SIZE(xdev->chan); i++)
if (err || xilinx_dpdma_chan_err(xdev->chan[i], isr, eisr))
tasklet_schedule(&xdev->chan[i]->err_task);
}
/**
* xilinx_dpdma_enable_irq - Enable interrupts
* @xdev: DPDMA device
*
* Enable interrupts.
*/
static void xilinx_dpdma_enable_irq(struct xilinx_dpdma_device *xdev)
{
dpdma_write(xdev->reg, XILINX_DPDMA_IEN, XILINX_DPDMA_INTR_ALL);
dpdma_write(xdev->reg, XILINX_DPDMA_EIEN, XILINX_DPDMA_EINTR_ALL);
}
/**
* xilinx_dpdma_disable_irq - Disable interrupts
* @xdev: DPDMA device
*
* Disable interrupts.
*/
static void xilinx_dpdma_disable_irq(struct xilinx_dpdma_device *xdev)
{
dpdma_write(xdev->reg, XILINX_DPDMA_IDS, XILINX_DPDMA_INTR_ALL);
dpdma_write(xdev->reg, XILINX_DPDMA_EIDS, XILINX_DPDMA_EINTR_ALL);
}
/**
* xilinx_dpdma_chan_err_task - Per channel tasklet for error handling
* @t: pointer to the tasklet associated with this handler
*
* Per channel error handling tasklet. This function waits for the outstanding
* transaction to complete and triggers error handling. After error handling,
* re-enable channel error interrupts, and restart the channel if needed.
*/
static void xilinx_dpdma_chan_err_task(struct tasklet_struct *t)
{
struct xilinx_dpdma_chan *chan = from_tasklet(chan, t, err_task);
struct xilinx_dpdma_device *xdev = chan->xdev;
unsigned long flags;
/* Proceed error handling even when polling fails. */
xilinx_dpdma_chan_poll_no_ostand(chan);
xilinx_dpdma_chan_handle_err(chan);
dpdma_write(xdev->reg, XILINX_DPDMA_IEN,
XILINX_DPDMA_INTR_CHAN_ERR_MASK << chan->id);
dpdma_write(xdev->reg, XILINX_DPDMA_EIEN,
XILINX_DPDMA_EINTR_CHAN_ERR_MASK << chan->id);
spin_lock_irqsave(&chan->lock, flags);
xilinx_dpdma_chan_queue_transfer(chan);
spin_unlock_irqrestore(&chan->lock, flags);
}
static irqreturn_t xilinx_dpdma_irq_handler(int irq, void *data)
{
struct xilinx_dpdma_device *xdev = data;
unsigned long mask;
unsigned int i;
u32 status;
u32 error;
status = dpdma_read(xdev->reg, XILINX_DPDMA_ISR);
error = dpdma_read(xdev->reg, XILINX_DPDMA_EISR);
if (!status && !error)
return IRQ_NONE;
dpdma_write(xdev->reg, XILINX_DPDMA_ISR, status);
dpdma_write(xdev->reg, XILINX_DPDMA_EISR, error);
if (status & XILINX_DPDMA_INTR_VSYNC) {
/*
* There's a single VSYNC interrupt that needs to be processed
* by each running channel to update the active descriptor.
*/
for (i = 0; i < ARRAY_SIZE(xdev->chan); i++) {
struct xilinx_dpdma_chan *chan = xdev->chan[i];
if (chan)
xilinx_dpdma_chan_vsync_irq(chan);
}
}
mask = FIELD_GET(XILINX_DPDMA_INTR_DESC_DONE_MASK, status);
if (mask) {
for_each_set_bit(i, &mask, ARRAY_SIZE(xdev->chan))
xilinx_dpdma_chan_done_irq(xdev->chan[i]);
}
mask = FIELD_GET(XILINX_DPDMA_INTR_NO_OSTAND_MASK, status);
if (mask) {
for_each_set_bit(i, &mask, ARRAY_SIZE(xdev->chan))
xilinx_dpdma_chan_notify_no_ostand(xdev->chan[i]);
}
mask = status & XILINX_DPDMA_INTR_ERR_ALL;
if (mask || error)
xilinx_dpdma_handle_err_irq(xdev, mask, error);
return IRQ_HANDLED;
}
/* -----------------------------------------------------------------------------
* Initialization & Cleanup
*/
static int xilinx_dpdma_chan_init(struct xilinx_dpdma_device *xdev,
unsigned int chan_id)
{
struct xilinx_dpdma_chan *chan;
chan = devm_kzalloc(xdev->dev, sizeof(*chan), GFP_KERNEL);
if (!chan)
return -ENOMEM;
chan->id = chan_id;
chan->reg = xdev->reg + XILINX_DPDMA_CH_BASE
+ XILINX_DPDMA_CH_OFFSET * chan->id;
chan->running = false;
chan->xdev = xdev;
spin_lock_init(&chan->lock);
init_waitqueue_head(&chan->wait_to_stop);
tasklet_setup(&chan->err_task, xilinx_dpdma_chan_err_task);
chan->vchan.desc_free = xilinx_dpdma_chan_free_tx_desc;
vchan_init(&chan->vchan, &xdev->common);
xdev->chan[chan->id] = chan;
return 0;
}
static void xilinx_dpdma_chan_remove(struct xilinx_dpdma_chan *chan)
{
if (!chan)
return;
tasklet_kill(&chan->err_task);
list_del(&chan->vchan.chan.device_node);
}
static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct xilinx_dpdma_device *xdev = ofdma->of_dma_data;
u32 chan_id = dma_spec->args[0];
if (chan_id >= ARRAY_SIZE(xdev->chan))
return NULL;
if (!xdev->chan[chan_id])
return NULL;
return dma_get_slave_channel(&xdev->chan[chan_id]->vchan.chan);
}
static void dpdma_hw_init(struct xilinx_dpdma_device *xdev)
{
unsigned int i;
void __iomem *reg;
/* Disable all interrupts */
xilinx_dpdma_disable_irq(xdev);
/* Stop all channels */
for (i = 0; i < ARRAY_SIZE(xdev->chan); i++) {
reg = xdev->reg + XILINX_DPDMA_CH_BASE
+ XILINX_DPDMA_CH_OFFSET * i;
dpdma_clr(reg, XILINX_DPDMA_CH_CNTL, XILINX_DPDMA_CH_CNTL_ENABLE);
}
/* Clear the interrupt status registers */
dpdma_write(xdev->reg, XILINX_DPDMA_ISR, XILINX_DPDMA_INTR_ALL);
dpdma_write(xdev->reg, XILINX_DPDMA_EISR, XILINX_DPDMA_EINTR_ALL);
}
static int xilinx_dpdma_probe(struct platform_device *pdev)
{
struct xilinx_dpdma_device *xdev;
struct dma_device *ddev;
unsigned int i;
int ret;
xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
if (!xdev)
return -ENOMEM;
xdev->dev = &pdev->dev;
xdev->ext_addr = sizeof(dma_addr_t) > 4;
INIT_LIST_HEAD(&xdev->common.channels);
platform_set_drvdata(pdev, xdev);
xdev->axi_clk = devm_clk_get(xdev->dev, "axi_clk");
if (IS_ERR(xdev->axi_clk))
return PTR_ERR(xdev->axi_clk);
xdev->reg = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(xdev->reg))
return PTR_ERR(xdev->reg);
dpdma_hw_init(xdev);
xdev->irq = platform_get_irq(pdev, 0);
if (xdev->irq < 0)
return xdev->irq;
ret = request_irq(xdev->irq, xilinx_dpdma_irq_handler, IRQF_SHARED,
dev_name(xdev->dev), xdev);
if (ret) {
dev_err(xdev->dev, "failed to request IRQ\n");
return ret;
}
ddev = &xdev->common;
ddev->dev = &pdev->dev;
dma_cap_set(DMA_SLAVE, ddev->cap_mask);
dma_cap_set(DMA_PRIVATE, ddev->cap_mask);
dma_cap_set(DMA_INTERLEAVE, ddev->cap_mask);
dma_cap_set(DMA_REPEAT, ddev->cap_mask);
dma_cap_set(DMA_LOAD_EOT, ddev->cap_mask);
ddev->copy_align = fls(XILINX_DPDMA_ALIGN_BYTES - 1);
ddev->device_alloc_chan_resources = xilinx_dpdma_alloc_chan_resources;
ddev->device_free_chan_resources = xilinx_dpdma_free_chan_resources;
ddev->device_prep_interleaved_dma = xilinx_dpdma_prep_interleaved_dma;
/* TODO: Can we achieve better granularity ? */
ddev->device_tx_status = dma_cookie_status;
ddev->device_issue_pending = xilinx_dpdma_issue_pending;
ddev->device_config = xilinx_dpdma_config;
ddev->device_pause = xilinx_dpdma_pause;
ddev->device_resume = xilinx_dpdma_resume;
ddev->device_terminate_all = xilinx_dpdma_terminate_all;
ddev->device_synchronize = xilinx_dpdma_synchronize;
ddev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED);
ddev->directions = BIT(DMA_MEM_TO_DEV);
ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
for (i = 0; i < ARRAY_SIZE(xdev->chan); ++i) {
ret = xilinx_dpdma_chan_init(xdev, i);
if (ret < 0) {
dev_err(xdev->dev, "failed to initialize channel %u\n",
i);
goto error;
}
}
ret = clk_prepare_enable(xdev->axi_clk);
if (ret) {
dev_err(xdev->dev, "failed to enable the axi clock\n");
goto error;
}
ret = dma_async_device_register(ddev);
if (ret) {
dev_err(xdev->dev, "failed to register the dma device\n");
goto error_dma_async;
}
ret = of_dma_controller_register(xdev->dev->of_node,
of_dma_xilinx_xlate, ddev);
if (ret) {
dev_err(xdev->dev, "failed to register DMA to DT DMA helper\n");
goto error_of_dma;
}
xilinx_dpdma_enable_irq(xdev);
xilinx_dpdma_debugfs_init(xdev);
dev_info(&pdev->dev, "Xilinx DPDMA engine is probed\n");
return 0;
error_of_dma:
dma_async_device_unregister(ddev);
error_dma_async:
clk_disable_unprepare(xdev->axi_clk);
error:
for (i = 0; i < ARRAY_SIZE(xdev->chan); i++)
xilinx_dpdma_chan_remove(xdev->chan[i]);
free_irq(xdev->irq, xdev);
return ret;
}
static int xilinx_dpdma_remove(struct platform_device *pdev)
{
struct xilinx_dpdma_device *xdev = platform_get_drvdata(pdev);
unsigned int i;
/* Start by disabling the IRQ to avoid races during cleanup. */
free_irq(xdev->irq, xdev);
xilinx_dpdma_disable_irq(xdev);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&xdev->common);
clk_disable_unprepare(xdev->axi_clk);
for (i = 0; i < ARRAY_SIZE(xdev->chan); i++)
xilinx_dpdma_chan_remove(xdev->chan[i]);
return 0;
}
static const struct of_device_id xilinx_dpdma_of_match[] = {
{ .compatible = "xlnx,zynqmp-dpdma",},
{ /* end of table */ },
};
MODULE_DEVICE_TABLE(of, xilinx_dpdma_of_match);
static struct platform_driver xilinx_dpdma_driver = {
.probe = xilinx_dpdma_probe,
.remove = xilinx_dpdma_remove,
.driver = {
.name = "xilinx-zynqmp-dpdma",
.of_match_table = xilinx_dpdma_of_match,
},
};
module_platform_driver(xilinx_dpdma_driver);
MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("Xilinx ZynqMP DPDMA driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/xilinx/xilinx_dpdma.c |
// SPDX-License-Identifier: GPL-2.0
// Copyright 2019 NXP
#include <linux/module.h>
#include <linux/types.h>
#include <linux/io.h>
#include <linux/fsl/mc.h>
#include "dpdmai.h"
struct dpdmai_rsp_get_attributes {
__le32 id;
u8 num_of_priorities;
u8 pad0[3];
__le16 major;
__le16 minor;
};
struct dpdmai_cmd_queue {
__le32 dest_id;
u8 priority;
u8 queue;
u8 dest_type;
u8 pad;
__le64 user_ctx;
union {
__le32 options;
__le32 fqid;
};
};
struct dpdmai_rsp_get_tx_queue {
__le64 pad;
__le32 fqid;
};
#define MC_CMD_OP(_cmd, _param, _offset, _width, _type, _arg) \
((_cmd).params[_param] |= mc_enc((_offset), (_width), _arg))
/* cmd, param, offset, width, type, arg_name */
#define DPDMAI_CMD_CREATE(cmd, cfg) \
do { \
MC_CMD_OP(cmd, 0, 8, 8, u8, (cfg)->priorities[0]);\
MC_CMD_OP(cmd, 0, 16, 8, u8, (cfg)->priorities[1]);\
} while (0)
static inline u64 mc_enc(int lsoffset, int width, u64 val)
{
return (val & MAKE_UMASK64(width)) << lsoffset;
}
/**
* dpdmai_open() - Open a control session for the specified object
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @dpdmai_id: DPDMAI unique ID
* @token: Returned token; use in subsequent API calls
*
* This function can be used to open a control session for an
* already created object; an object may have been declared in
* the DPL or by calling the dpdmai_create() function.
* This function returns a unique authentication token,
* associated with the specific object ID and the specific MC
* portal; this token must be used in all subsequent commands for
* this specific object.
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_open(struct fsl_mc_io *mc_io, u32 cmd_flags,
int dpdmai_id, u16 *token)
{
struct fsl_mc_command cmd = { 0 };
__le64 *cmd_dpdmai_id;
int err;
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_OPEN,
cmd_flags, 0);
cmd_dpdmai_id = cmd.params;
*cmd_dpdmai_id = cpu_to_le32(dpdmai_id);
/* send command to mc*/
err = mc_send_command(mc_io, &cmd);
if (err)
return err;
/* retrieve response parameters */
*token = mc_cmd_hdr_read_token(&cmd);
return 0;
}
EXPORT_SYMBOL_GPL(dpdmai_open);
/**
* dpdmai_close() - Close the control session of the object
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPDMAI object
*
* After this function is called, no further operations are
* allowed on the object without opening a new control session.
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_close(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token)
{
struct fsl_mc_command cmd = { 0 };
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_CLOSE,
cmd_flags, token);
/* send command to mc*/
return mc_send_command(mc_io, &cmd);
}
EXPORT_SYMBOL_GPL(dpdmai_close);
/**
* dpdmai_create() - Create the DPDMAI object
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @cfg: Configuration structure
* @token: Returned token; use in subsequent API calls
*
* Create the DPDMAI object, allocate required resources and
* perform required initialization.
*
* The object can be created either by declaring it in the
* DPL file, or by calling this function.
*
* This function returns a unique authentication token,
* associated with the specific object ID and the specific MC
* portal; this token must be used in all subsequent calls to
* this specific object. For objects that are created using the
* DPL file, call dpdmai_open() function to get an authentication
* token first.
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_create(struct fsl_mc_io *mc_io, u32 cmd_flags,
const struct dpdmai_cfg *cfg, u16 *token)
{
struct fsl_mc_command cmd = { 0 };
int err;
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_CREATE,
cmd_flags, 0);
DPDMAI_CMD_CREATE(cmd, cfg);
/* send command to mc*/
err = mc_send_command(mc_io, &cmd);
if (err)
return err;
/* retrieve response parameters */
*token = mc_cmd_hdr_read_token(&cmd);
return 0;
}
/**
* dpdmai_destroy() - Destroy the DPDMAI object and release all its resources.
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPDMAI object
*
* Return: '0' on Success; error code otherwise.
*/
int dpdmai_destroy(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token)
{
struct fsl_mc_command cmd = { 0 };
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_DESTROY,
cmd_flags, token);
/* send command to mc*/
return mc_send_command(mc_io, &cmd);
}
EXPORT_SYMBOL_GPL(dpdmai_destroy);
/**
* dpdmai_enable() - Enable the DPDMAI, allow sending and receiving frames.
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPDMAI object
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_enable(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token)
{
struct fsl_mc_command cmd = { 0 };
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_ENABLE,
cmd_flags, token);
/* send command to mc*/
return mc_send_command(mc_io, &cmd);
}
EXPORT_SYMBOL_GPL(dpdmai_enable);
/**
* dpdmai_disable() - Disable the DPDMAI, stop sending and receiving frames.
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPDMAI object
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_disable(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token)
{
struct fsl_mc_command cmd = { 0 };
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_DISABLE,
cmd_flags, token);
/* send command to mc*/
return mc_send_command(mc_io, &cmd);
}
EXPORT_SYMBOL_GPL(dpdmai_disable);
/**
* dpdmai_reset() - Reset the DPDMAI, returns the object to initial state.
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPDMAI object
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_reset(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token)
{
struct fsl_mc_command cmd = { 0 };
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_RESET,
cmd_flags, token);
/* send command to mc*/
return mc_send_command(mc_io, &cmd);
}
EXPORT_SYMBOL_GPL(dpdmai_reset);
/**
* dpdmai_get_attributes() - Retrieve DPDMAI attributes.
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPDMAI object
* @attr: Returned object's attributes
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_get_attributes(struct fsl_mc_io *mc_io, u32 cmd_flags,
u16 token, struct dpdmai_attr *attr)
{
struct dpdmai_rsp_get_attributes *rsp_params;
struct fsl_mc_command cmd = { 0 };
int err;
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_GET_ATTR,
cmd_flags, token);
/* send command to mc*/
err = mc_send_command(mc_io, &cmd);
if (err)
return err;
/* retrieve response parameters */
rsp_params = (struct dpdmai_rsp_get_attributes *)cmd.params;
attr->id = le32_to_cpu(rsp_params->id);
attr->version.major = le16_to_cpu(rsp_params->major);
attr->version.minor = le16_to_cpu(rsp_params->minor);
attr->num_of_priorities = rsp_params->num_of_priorities;
return 0;
}
EXPORT_SYMBOL_GPL(dpdmai_get_attributes);
/**
* dpdmai_set_rx_queue() - Set Rx queue configuration
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPDMAI object
* @priority: Select the queue relative to number of
* priorities configured at DPDMAI creation
* @cfg: Rx queue configuration
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_set_rx_queue(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token,
u8 priority, const struct dpdmai_rx_queue_cfg *cfg)
{
struct dpdmai_cmd_queue *cmd_params;
struct fsl_mc_command cmd = { 0 };
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_SET_RX_QUEUE,
cmd_flags, token);
cmd_params = (struct dpdmai_cmd_queue *)cmd.params;
cmd_params->dest_id = cpu_to_le32(cfg->dest_cfg.dest_id);
cmd_params->priority = cfg->dest_cfg.priority;
cmd_params->queue = priority;
cmd_params->dest_type = cfg->dest_cfg.dest_type;
cmd_params->user_ctx = cpu_to_le64(cfg->user_ctx);
cmd_params->options = cpu_to_le32(cfg->options);
/* send command to mc*/
return mc_send_command(mc_io, &cmd);
}
EXPORT_SYMBOL_GPL(dpdmai_set_rx_queue);
/**
* dpdmai_get_rx_queue() - Retrieve Rx queue attributes.
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPDMAI object
* @priority: Select the queue relative to number of
* priorities configured at DPDMAI creation
* @attr: Returned Rx queue attributes
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_get_rx_queue(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token,
u8 priority, struct dpdmai_rx_queue_attr *attr)
{
struct dpdmai_cmd_queue *cmd_params;
struct fsl_mc_command cmd = { 0 };
int err;
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_GET_RX_QUEUE,
cmd_flags, token);
cmd_params = (struct dpdmai_cmd_queue *)cmd.params;
cmd_params->queue = priority;
/* send command to mc*/
err = mc_send_command(mc_io, &cmd);
if (err)
return err;
/* retrieve response parameters */
attr->dest_cfg.dest_id = le32_to_cpu(cmd_params->dest_id);
attr->dest_cfg.priority = cmd_params->priority;
attr->dest_cfg.dest_type = cmd_params->dest_type;
attr->user_ctx = le64_to_cpu(cmd_params->user_ctx);
attr->fqid = le32_to_cpu(cmd_params->fqid);
return 0;
}
EXPORT_SYMBOL_GPL(dpdmai_get_rx_queue);
/**
* dpdmai_get_tx_queue() - Retrieve Tx queue attributes.
* @mc_io: Pointer to MC portal's I/O object
* @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
* @token: Token of DPDMAI object
* @priority: Select the queue relative to number of
* priorities configured at DPDMAI creation
* @fqid: Returned Tx queue
*
* Return: '0' on Success; Error code otherwise.
*/
int dpdmai_get_tx_queue(struct fsl_mc_io *mc_io, u32 cmd_flags,
u16 token, u8 priority, u32 *fqid)
{
struct dpdmai_rsp_get_tx_queue *rsp_params;
struct dpdmai_cmd_queue *cmd_params;
struct fsl_mc_command cmd = { 0 };
int err;
/* prepare command */
cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_GET_TX_QUEUE,
cmd_flags, token);
cmd_params = (struct dpdmai_cmd_queue *)cmd.params;
cmd_params->queue = priority;
/* send command to mc*/
err = mc_send_command(mc_io, &cmd);
if (err)
return err;
/* retrieve response parameters */
rsp_params = (struct dpdmai_rsp_get_tx_queue *)cmd.params;
*fqid = le32_to_cpu(rsp_params->fqid);
return 0;
}
EXPORT_SYMBOL_GPL(dpdmai_get_tx_queue);
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/fsl-dpaa2-qdma/dpdmai.c |
// SPDX-License-Identifier: GPL-2.0
// Copyright 2019 NXP
#include <linux/init.h>
#include <linux/module.h>
#include <linux/dmapool.h>
#include <linux/of_irq.h>
#include <linux/iommu.h>
#include <linux/sys_soc.h>
#include <linux/fsl/mc.h>
#include <soc/fsl/dpaa2-io.h>
#include "../virt-dma.h"
#include "dpdmai.h"
#include "dpaa2-qdma.h"
static bool smmu_disable = true;
static struct dpaa2_qdma_chan *to_dpaa2_qdma_chan(struct dma_chan *chan)
{
return container_of(chan, struct dpaa2_qdma_chan, vchan.chan);
}
static struct dpaa2_qdma_comp *to_fsl_qdma_comp(struct virt_dma_desc *vd)
{
return container_of(vd, struct dpaa2_qdma_comp, vdesc);
}
static int dpaa2_qdma_alloc_chan_resources(struct dma_chan *chan)
{
struct dpaa2_qdma_chan *dpaa2_chan = to_dpaa2_qdma_chan(chan);
struct dpaa2_qdma_engine *dpaa2_qdma = dpaa2_chan->qdma;
struct device *dev = &dpaa2_qdma->priv->dpdmai_dev->dev;
dpaa2_chan->fd_pool = dma_pool_create("fd_pool", dev,
sizeof(struct dpaa2_fd),
sizeof(struct dpaa2_fd), 0);
if (!dpaa2_chan->fd_pool)
goto err;
dpaa2_chan->fl_pool = dma_pool_create("fl_pool", dev,
sizeof(struct dpaa2_fl_entry),
sizeof(struct dpaa2_fl_entry), 0);
if (!dpaa2_chan->fl_pool)
goto err_fd;
dpaa2_chan->sdd_pool =
dma_pool_create("sdd_pool", dev,
sizeof(struct dpaa2_qdma_sd_d),
sizeof(struct dpaa2_qdma_sd_d), 0);
if (!dpaa2_chan->sdd_pool)
goto err_fl;
return dpaa2_qdma->desc_allocated++;
err_fl:
dma_pool_destroy(dpaa2_chan->fl_pool);
err_fd:
dma_pool_destroy(dpaa2_chan->fd_pool);
err:
return -ENOMEM;
}
static void dpaa2_qdma_free_chan_resources(struct dma_chan *chan)
{
struct dpaa2_qdma_chan *dpaa2_chan = to_dpaa2_qdma_chan(chan);
struct dpaa2_qdma_engine *dpaa2_qdma = dpaa2_chan->qdma;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&dpaa2_chan->vchan.lock, flags);
vchan_get_all_descriptors(&dpaa2_chan->vchan, &head);
spin_unlock_irqrestore(&dpaa2_chan->vchan.lock, flags);
vchan_dma_desc_free_list(&dpaa2_chan->vchan, &head);
dpaa2_dpdmai_free_comp(dpaa2_chan, &dpaa2_chan->comp_used);
dpaa2_dpdmai_free_comp(dpaa2_chan, &dpaa2_chan->comp_free);
dma_pool_destroy(dpaa2_chan->fd_pool);
dma_pool_destroy(dpaa2_chan->fl_pool);
dma_pool_destroy(dpaa2_chan->sdd_pool);
dpaa2_qdma->desc_allocated--;
}
/*
* Request a command descriptor for enqueue.
*/
static struct dpaa2_qdma_comp *
dpaa2_qdma_request_desc(struct dpaa2_qdma_chan *dpaa2_chan)
{
struct dpaa2_qdma_priv *qdma_priv = dpaa2_chan->qdma->priv;
struct device *dev = &qdma_priv->dpdmai_dev->dev;
struct dpaa2_qdma_comp *comp_temp = NULL;
unsigned long flags;
spin_lock_irqsave(&dpaa2_chan->queue_lock, flags);
if (list_empty(&dpaa2_chan->comp_free)) {
spin_unlock_irqrestore(&dpaa2_chan->queue_lock, flags);
comp_temp = kzalloc(sizeof(*comp_temp), GFP_NOWAIT);
if (!comp_temp)
goto err;
comp_temp->fd_virt_addr =
dma_pool_alloc(dpaa2_chan->fd_pool, GFP_NOWAIT,
&comp_temp->fd_bus_addr);
if (!comp_temp->fd_virt_addr)
goto err_comp;
comp_temp->fl_virt_addr =
dma_pool_alloc(dpaa2_chan->fl_pool, GFP_NOWAIT,
&comp_temp->fl_bus_addr);
if (!comp_temp->fl_virt_addr)
goto err_fd_virt;
comp_temp->desc_virt_addr =
dma_pool_alloc(dpaa2_chan->sdd_pool, GFP_NOWAIT,
&comp_temp->desc_bus_addr);
if (!comp_temp->desc_virt_addr)
goto err_fl_virt;
comp_temp->qchan = dpaa2_chan;
return comp_temp;
}
comp_temp = list_first_entry(&dpaa2_chan->comp_free,
struct dpaa2_qdma_comp, list);
list_del(&comp_temp->list);
spin_unlock_irqrestore(&dpaa2_chan->queue_lock, flags);
comp_temp->qchan = dpaa2_chan;
return comp_temp;
err_fl_virt:
dma_pool_free(dpaa2_chan->fl_pool,
comp_temp->fl_virt_addr,
comp_temp->fl_bus_addr);
err_fd_virt:
dma_pool_free(dpaa2_chan->fd_pool,
comp_temp->fd_virt_addr,
comp_temp->fd_bus_addr);
err_comp:
kfree(comp_temp);
err:
dev_err(dev, "Failed to request descriptor\n");
return NULL;
}
static void
dpaa2_qdma_populate_fd(u32 format, struct dpaa2_qdma_comp *dpaa2_comp)
{
struct dpaa2_fd *fd;
fd = dpaa2_comp->fd_virt_addr;
memset(fd, 0, sizeof(struct dpaa2_fd));
/* fd populated */
dpaa2_fd_set_addr(fd, dpaa2_comp->fl_bus_addr);
/*
* Bypass memory translation, Frame list format, short length disable
* we need to disable BMT if fsl-mc use iova addr
*/
if (smmu_disable)
dpaa2_fd_set_bpid(fd, QMAN_FD_BMT_ENABLE);
dpaa2_fd_set_format(fd, QMAN_FD_FMT_ENABLE | QMAN_FD_SL_DISABLE);
dpaa2_fd_set_frc(fd, format | QDMA_SER_CTX);
}
/* first frame list for descriptor buffer */
static void
dpaa2_qdma_populate_first_framel(struct dpaa2_fl_entry *f_list,
struct dpaa2_qdma_comp *dpaa2_comp,
bool wrt_changed)
{
struct dpaa2_qdma_sd_d *sdd;
sdd = dpaa2_comp->desc_virt_addr;
memset(sdd, 0, 2 * (sizeof(*sdd)));
/* source descriptor CMD */
sdd->cmd = cpu_to_le32(QDMA_SD_CMD_RDTTYPE_COHERENT);
sdd++;
/* dest descriptor CMD */
if (wrt_changed)
sdd->cmd = cpu_to_le32(LX2160_QDMA_DD_CMD_WRTTYPE_COHERENT);
else
sdd->cmd = cpu_to_le32(QDMA_DD_CMD_WRTTYPE_COHERENT);
memset(f_list, 0, sizeof(struct dpaa2_fl_entry));
/* first frame list to source descriptor */
dpaa2_fl_set_addr(f_list, dpaa2_comp->desc_bus_addr);
dpaa2_fl_set_len(f_list, 0x20);
dpaa2_fl_set_format(f_list, QDMA_FL_FMT_SBF | QDMA_FL_SL_LONG);
/* bypass memory translation */
if (smmu_disable)
f_list->bpid = cpu_to_le16(QDMA_FL_BMT_ENABLE);
}
/* source and destination frame list */
static void
dpaa2_qdma_populate_frames(struct dpaa2_fl_entry *f_list,
dma_addr_t dst, dma_addr_t src,
size_t len, uint8_t fmt)
{
/* source frame list to source buffer */
memset(f_list, 0, sizeof(struct dpaa2_fl_entry));
dpaa2_fl_set_addr(f_list, src);
dpaa2_fl_set_len(f_list, len);
/* single buffer frame or scatter gather frame */
dpaa2_fl_set_format(f_list, (fmt | QDMA_FL_SL_LONG));
/* bypass memory translation */
if (smmu_disable)
f_list->bpid = cpu_to_le16(QDMA_FL_BMT_ENABLE);
f_list++;
/* destination frame list to destination buffer */
memset(f_list, 0, sizeof(struct dpaa2_fl_entry));
dpaa2_fl_set_addr(f_list, dst);
dpaa2_fl_set_len(f_list, len);
dpaa2_fl_set_format(f_list, (fmt | QDMA_FL_SL_LONG));
/* single buffer frame or scatter gather frame */
dpaa2_fl_set_final(f_list, QDMA_FL_F);
/* bypass memory translation */
if (smmu_disable)
f_list->bpid = cpu_to_le16(QDMA_FL_BMT_ENABLE);
}
static struct dma_async_tx_descriptor
*dpaa2_qdma_prep_memcpy(struct dma_chan *chan, dma_addr_t dst,
dma_addr_t src, size_t len, ulong flags)
{
struct dpaa2_qdma_chan *dpaa2_chan = to_dpaa2_qdma_chan(chan);
struct dpaa2_qdma_engine *dpaa2_qdma;
struct dpaa2_qdma_comp *dpaa2_comp;
struct dpaa2_fl_entry *f_list;
bool wrt_changed;
dpaa2_qdma = dpaa2_chan->qdma;
dpaa2_comp = dpaa2_qdma_request_desc(dpaa2_chan);
if (!dpaa2_comp)
return NULL;
wrt_changed = (bool)dpaa2_qdma->qdma_wrtype_fixup;
/* populate Frame descriptor */
dpaa2_qdma_populate_fd(QDMA_FD_LONG_FORMAT, dpaa2_comp);
f_list = dpaa2_comp->fl_virt_addr;
/* first frame list for descriptor buffer (logn format) */
dpaa2_qdma_populate_first_framel(f_list, dpaa2_comp, wrt_changed);
f_list++;
dpaa2_qdma_populate_frames(f_list, dst, src, len, QDMA_FL_FMT_SBF);
return vchan_tx_prep(&dpaa2_chan->vchan, &dpaa2_comp->vdesc, flags);
}
static void dpaa2_qdma_issue_pending(struct dma_chan *chan)
{
struct dpaa2_qdma_chan *dpaa2_chan = to_dpaa2_qdma_chan(chan);
struct dpaa2_qdma_comp *dpaa2_comp;
struct virt_dma_desc *vdesc;
struct dpaa2_fd *fd;
unsigned long flags;
int err;
spin_lock_irqsave(&dpaa2_chan->queue_lock, flags);
spin_lock(&dpaa2_chan->vchan.lock);
if (vchan_issue_pending(&dpaa2_chan->vchan)) {
vdesc = vchan_next_desc(&dpaa2_chan->vchan);
if (!vdesc)
goto err_enqueue;
dpaa2_comp = to_fsl_qdma_comp(vdesc);
fd = dpaa2_comp->fd_virt_addr;
list_del(&vdesc->node);
list_add_tail(&dpaa2_comp->list, &dpaa2_chan->comp_used);
err = dpaa2_io_service_enqueue_fq(NULL, dpaa2_chan->fqid, fd);
if (err) {
list_move_tail(&dpaa2_comp->list,
&dpaa2_chan->comp_free);
}
}
err_enqueue:
spin_unlock(&dpaa2_chan->vchan.lock);
spin_unlock_irqrestore(&dpaa2_chan->queue_lock, flags);
}
static int __cold dpaa2_qdma_setup(struct fsl_mc_device *ls_dev)
{
struct dpaa2_qdma_priv_per_prio *ppriv;
struct device *dev = &ls_dev->dev;
struct dpaa2_qdma_priv *priv;
u8 prio_def = DPDMAI_PRIO_NUM;
int err = -EINVAL;
int i;
priv = dev_get_drvdata(dev);
priv->dev = dev;
priv->dpqdma_id = ls_dev->obj_desc.id;
/* Get the handle for the DPDMAI this interface is associate with */
err = dpdmai_open(priv->mc_io, 0, priv->dpqdma_id, &ls_dev->mc_handle);
if (err) {
dev_err(dev, "dpdmai_open() failed\n");
return err;
}
dev_dbg(dev, "Opened dpdmai object successfully\n");
err = dpdmai_get_attributes(priv->mc_io, 0, ls_dev->mc_handle,
&priv->dpdmai_attr);
if (err) {
dev_err(dev, "dpdmai_get_attributes() failed\n");
goto exit;
}
if (priv->dpdmai_attr.version.major > DPDMAI_VER_MAJOR) {
err = -EINVAL;
dev_err(dev, "DPDMAI major version mismatch\n"
"Found %u.%u, supported version is %u.%u\n",
priv->dpdmai_attr.version.major,
priv->dpdmai_attr.version.minor,
DPDMAI_VER_MAJOR, DPDMAI_VER_MINOR);
goto exit;
}
if (priv->dpdmai_attr.version.minor > DPDMAI_VER_MINOR) {
err = -EINVAL;
dev_err(dev, "DPDMAI minor version mismatch\n"
"Found %u.%u, supported version is %u.%u\n",
priv->dpdmai_attr.version.major,
priv->dpdmai_attr.version.minor,
DPDMAI_VER_MAJOR, DPDMAI_VER_MINOR);
goto exit;
}
priv->num_pairs = min(priv->dpdmai_attr.num_of_priorities, prio_def);
ppriv = kcalloc(priv->num_pairs, sizeof(*ppriv), GFP_KERNEL);
if (!ppriv) {
err = -ENOMEM;
goto exit;
}
priv->ppriv = ppriv;
for (i = 0; i < priv->num_pairs; i++) {
err = dpdmai_get_rx_queue(priv->mc_io, 0, ls_dev->mc_handle,
i, &priv->rx_queue_attr[i]);
if (err) {
dev_err(dev, "dpdmai_get_rx_queue() failed\n");
goto exit;
}
ppriv->rsp_fqid = priv->rx_queue_attr[i].fqid;
err = dpdmai_get_tx_queue(priv->mc_io, 0, ls_dev->mc_handle,
i, &priv->tx_fqid[i]);
if (err) {
dev_err(dev, "dpdmai_get_tx_queue() failed\n");
goto exit;
}
ppriv->req_fqid = priv->tx_fqid[i];
ppriv->prio = i;
ppriv->priv = priv;
ppriv++;
}
return 0;
exit:
dpdmai_close(priv->mc_io, 0, ls_dev->mc_handle);
return err;
}
static void dpaa2_qdma_fqdan_cb(struct dpaa2_io_notification_ctx *ctx)
{
struct dpaa2_qdma_priv_per_prio *ppriv = container_of(ctx,
struct dpaa2_qdma_priv_per_prio, nctx);
struct dpaa2_qdma_comp *dpaa2_comp, *_comp_tmp;
struct dpaa2_qdma_priv *priv = ppriv->priv;
u32 n_chans = priv->dpaa2_qdma->n_chans;
struct dpaa2_qdma_chan *qchan;
const struct dpaa2_fd *fd_eq;
const struct dpaa2_fd *fd;
struct dpaa2_dq *dq;
int is_last = 0;
int found;
u8 status;
int err;
int i;
do {
err = dpaa2_io_service_pull_fq(NULL, ppriv->rsp_fqid,
ppriv->store);
} while (err);
while (!is_last) {
do {
dq = dpaa2_io_store_next(ppriv->store, &is_last);
} while (!is_last && !dq);
if (!dq) {
dev_err(priv->dev, "FQID returned no valid frames!\n");
continue;
}
/* obtain FD and process the error */
fd = dpaa2_dq_fd(dq);
status = dpaa2_fd_get_ctrl(fd) & 0xff;
if (status)
dev_err(priv->dev, "FD error occurred\n");
found = 0;
for (i = 0; i < n_chans; i++) {
qchan = &priv->dpaa2_qdma->chans[i];
spin_lock(&qchan->queue_lock);
if (list_empty(&qchan->comp_used)) {
spin_unlock(&qchan->queue_lock);
continue;
}
list_for_each_entry_safe(dpaa2_comp, _comp_tmp,
&qchan->comp_used, list) {
fd_eq = dpaa2_comp->fd_virt_addr;
if (le64_to_cpu(fd_eq->simple.addr) ==
le64_to_cpu(fd->simple.addr)) {
spin_lock(&qchan->vchan.lock);
vchan_cookie_complete(&
dpaa2_comp->vdesc);
spin_unlock(&qchan->vchan.lock);
found = 1;
break;
}
}
spin_unlock(&qchan->queue_lock);
if (found)
break;
}
}
dpaa2_io_service_rearm(NULL, ctx);
}
static int __cold dpaa2_qdma_dpio_setup(struct dpaa2_qdma_priv *priv)
{
struct dpaa2_qdma_priv_per_prio *ppriv;
struct device *dev = priv->dev;
int err = -EINVAL;
int i, num;
num = priv->num_pairs;
ppriv = priv->ppriv;
for (i = 0; i < num; i++) {
ppriv->nctx.is_cdan = 0;
ppriv->nctx.desired_cpu = DPAA2_IO_ANY_CPU;
ppriv->nctx.id = ppriv->rsp_fqid;
ppriv->nctx.cb = dpaa2_qdma_fqdan_cb;
err = dpaa2_io_service_register(NULL, &ppriv->nctx, dev);
if (err) {
dev_err(dev, "Notification register failed\n");
goto err_service;
}
ppriv->store =
dpaa2_io_store_create(DPAA2_QDMA_STORE_SIZE, dev);
if (!ppriv->store) {
err = -ENOMEM;
dev_err(dev, "dpaa2_io_store_create() failed\n");
goto err_store;
}
ppriv++;
}
return 0;
err_store:
dpaa2_io_service_deregister(NULL, &ppriv->nctx, dev);
err_service:
ppriv--;
while (ppriv >= priv->ppriv) {
dpaa2_io_service_deregister(NULL, &ppriv->nctx, dev);
dpaa2_io_store_destroy(ppriv->store);
ppriv--;
}
return err;
}
static void dpaa2_dpmai_store_free(struct dpaa2_qdma_priv *priv)
{
struct dpaa2_qdma_priv_per_prio *ppriv = priv->ppriv;
int i;
for (i = 0; i < priv->num_pairs; i++) {
dpaa2_io_store_destroy(ppriv->store);
ppriv++;
}
}
static void dpaa2_dpdmai_dpio_free(struct dpaa2_qdma_priv *priv)
{
struct dpaa2_qdma_priv_per_prio *ppriv = priv->ppriv;
struct device *dev = priv->dev;
int i;
for (i = 0; i < priv->num_pairs; i++) {
dpaa2_io_service_deregister(NULL, &ppriv->nctx, dev);
ppriv++;
}
}
static int __cold dpaa2_dpdmai_bind(struct dpaa2_qdma_priv *priv)
{
struct dpdmai_rx_queue_cfg rx_queue_cfg;
struct dpaa2_qdma_priv_per_prio *ppriv;
struct device *dev = priv->dev;
struct fsl_mc_device *ls_dev;
int i, num;
int err;
ls_dev = to_fsl_mc_device(dev);
num = priv->num_pairs;
ppriv = priv->ppriv;
for (i = 0; i < num; i++) {
rx_queue_cfg.options = DPDMAI_QUEUE_OPT_USER_CTX |
DPDMAI_QUEUE_OPT_DEST;
rx_queue_cfg.user_ctx = ppriv->nctx.qman64;
rx_queue_cfg.dest_cfg.dest_type = DPDMAI_DEST_DPIO;
rx_queue_cfg.dest_cfg.dest_id = ppriv->nctx.dpio_id;
rx_queue_cfg.dest_cfg.priority = ppriv->prio;
err = dpdmai_set_rx_queue(priv->mc_io, 0, ls_dev->mc_handle,
rx_queue_cfg.dest_cfg.priority,
&rx_queue_cfg);
if (err) {
dev_err(dev, "dpdmai_set_rx_queue() failed\n");
return err;
}
ppriv++;
}
return 0;
}
static int __cold dpaa2_dpdmai_dpio_unbind(struct dpaa2_qdma_priv *priv)
{
struct dpaa2_qdma_priv_per_prio *ppriv = priv->ppriv;
struct device *dev = priv->dev;
struct fsl_mc_device *ls_dev;
int err = 0;
int i;
ls_dev = to_fsl_mc_device(dev);
for (i = 0; i < priv->num_pairs; i++) {
ppriv->nctx.qman64 = 0;
ppriv->nctx.dpio_id = 0;
ppriv++;
}
err = dpdmai_reset(priv->mc_io, 0, ls_dev->mc_handle);
if (err)
dev_err(dev, "dpdmai_reset() failed\n");
return err;
}
static void dpaa2_dpdmai_free_comp(struct dpaa2_qdma_chan *qchan,
struct list_head *head)
{
struct dpaa2_qdma_comp *comp_tmp, *_comp_tmp;
unsigned long flags;
list_for_each_entry_safe(comp_tmp, _comp_tmp,
head, list) {
spin_lock_irqsave(&qchan->queue_lock, flags);
list_del(&comp_tmp->list);
spin_unlock_irqrestore(&qchan->queue_lock, flags);
dma_pool_free(qchan->fd_pool,
comp_tmp->fd_virt_addr,
comp_tmp->fd_bus_addr);
dma_pool_free(qchan->fl_pool,
comp_tmp->fl_virt_addr,
comp_tmp->fl_bus_addr);
dma_pool_free(qchan->sdd_pool,
comp_tmp->desc_virt_addr,
comp_tmp->desc_bus_addr);
kfree(comp_tmp);
}
}
static void dpaa2_dpdmai_free_channels(struct dpaa2_qdma_engine *dpaa2_qdma)
{
struct dpaa2_qdma_chan *qchan;
int num, i;
num = dpaa2_qdma->n_chans;
for (i = 0; i < num; i++) {
qchan = &dpaa2_qdma->chans[i];
dpaa2_dpdmai_free_comp(qchan, &qchan->comp_used);
dpaa2_dpdmai_free_comp(qchan, &qchan->comp_free);
dma_pool_destroy(qchan->fd_pool);
dma_pool_destroy(qchan->fl_pool);
dma_pool_destroy(qchan->sdd_pool);
}
}
static void dpaa2_qdma_free_desc(struct virt_dma_desc *vdesc)
{
struct dpaa2_qdma_comp *dpaa2_comp;
struct dpaa2_qdma_chan *qchan;
unsigned long flags;
dpaa2_comp = to_fsl_qdma_comp(vdesc);
qchan = dpaa2_comp->qchan;
spin_lock_irqsave(&qchan->queue_lock, flags);
list_move_tail(&dpaa2_comp->list, &qchan->comp_free);
spin_unlock_irqrestore(&qchan->queue_lock, flags);
}
static int dpaa2_dpdmai_init_channels(struct dpaa2_qdma_engine *dpaa2_qdma)
{
struct dpaa2_qdma_priv *priv = dpaa2_qdma->priv;
struct dpaa2_qdma_chan *dpaa2_chan;
int num = priv->num_pairs;
int i;
INIT_LIST_HEAD(&dpaa2_qdma->dma_dev.channels);
for (i = 0; i < dpaa2_qdma->n_chans; i++) {
dpaa2_chan = &dpaa2_qdma->chans[i];
dpaa2_chan->qdma = dpaa2_qdma;
dpaa2_chan->fqid = priv->tx_fqid[i % num];
dpaa2_chan->vchan.desc_free = dpaa2_qdma_free_desc;
vchan_init(&dpaa2_chan->vchan, &dpaa2_qdma->dma_dev);
spin_lock_init(&dpaa2_chan->queue_lock);
INIT_LIST_HEAD(&dpaa2_chan->comp_used);
INIT_LIST_HEAD(&dpaa2_chan->comp_free);
}
return 0;
}
static int dpaa2_qdma_probe(struct fsl_mc_device *dpdmai_dev)
{
struct device *dev = &dpdmai_dev->dev;
struct dpaa2_qdma_engine *dpaa2_qdma;
struct dpaa2_qdma_priv *priv;
int err;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
dev_set_drvdata(dev, priv);
priv->dpdmai_dev = dpdmai_dev;
priv->iommu_domain = iommu_get_domain_for_dev(dev);
if (priv->iommu_domain)
smmu_disable = false;
/* obtain a MC portal */
err = fsl_mc_portal_allocate(dpdmai_dev, 0, &priv->mc_io);
if (err) {
if (err == -ENXIO)
err = -EPROBE_DEFER;
else
dev_err(dev, "MC portal allocation failed\n");
goto err_mcportal;
}
/* DPDMAI initialization */
err = dpaa2_qdma_setup(dpdmai_dev);
if (err) {
dev_err(dev, "dpaa2_dpdmai_setup() failed\n");
goto err_dpdmai_setup;
}
/* DPIO */
err = dpaa2_qdma_dpio_setup(priv);
if (err) {
dev_err(dev, "dpaa2_dpdmai_dpio_setup() failed\n");
goto err_dpio_setup;
}
/* DPDMAI binding to DPIO */
err = dpaa2_dpdmai_bind(priv);
if (err) {
dev_err(dev, "dpaa2_dpdmai_bind() failed\n");
goto err_bind;
}
/* DPDMAI enable */
err = dpdmai_enable(priv->mc_io, 0, dpdmai_dev->mc_handle);
if (err) {
dev_err(dev, "dpdmai_enable() failed\n");
goto err_enable;
}
dpaa2_qdma = kzalloc(sizeof(*dpaa2_qdma), GFP_KERNEL);
if (!dpaa2_qdma) {
err = -ENOMEM;
goto err_eng;
}
priv->dpaa2_qdma = dpaa2_qdma;
dpaa2_qdma->priv = priv;
dpaa2_qdma->desc_allocated = 0;
dpaa2_qdma->n_chans = NUM_CH;
dpaa2_dpdmai_init_channels(dpaa2_qdma);
if (soc_device_match(soc_fixup_tuning))
dpaa2_qdma->qdma_wrtype_fixup = true;
else
dpaa2_qdma->qdma_wrtype_fixup = false;
dma_cap_set(DMA_PRIVATE, dpaa2_qdma->dma_dev.cap_mask);
dma_cap_set(DMA_SLAVE, dpaa2_qdma->dma_dev.cap_mask);
dma_cap_set(DMA_MEMCPY, dpaa2_qdma->dma_dev.cap_mask);
dpaa2_qdma->dma_dev.dev = dev;
dpaa2_qdma->dma_dev.device_alloc_chan_resources =
dpaa2_qdma_alloc_chan_resources;
dpaa2_qdma->dma_dev.device_free_chan_resources =
dpaa2_qdma_free_chan_resources;
dpaa2_qdma->dma_dev.device_tx_status = dma_cookie_status;
dpaa2_qdma->dma_dev.device_prep_dma_memcpy = dpaa2_qdma_prep_memcpy;
dpaa2_qdma->dma_dev.device_issue_pending = dpaa2_qdma_issue_pending;
err = dma_async_device_register(&dpaa2_qdma->dma_dev);
if (err) {
dev_err(dev, "Can't register NXP QDMA engine.\n");
goto err_dpaa2_qdma;
}
return 0;
err_dpaa2_qdma:
kfree(dpaa2_qdma);
err_eng:
dpdmai_disable(priv->mc_io, 0, dpdmai_dev->mc_handle);
err_enable:
dpaa2_dpdmai_dpio_unbind(priv);
err_bind:
dpaa2_dpmai_store_free(priv);
dpaa2_dpdmai_dpio_free(priv);
err_dpio_setup:
kfree(priv->ppriv);
dpdmai_close(priv->mc_io, 0, dpdmai_dev->mc_handle);
err_dpdmai_setup:
fsl_mc_portal_free(priv->mc_io);
err_mcportal:
kfree(priv);
dev_set_drvdata(dev, NULL);
return err;
}
static void dpaa2_qdma_remove(struct fsl_mc_device *ls_dev)
{
struct dpaa2_qdma_engine *dpaa2_qdma;
struct dpaa2_qdma_priv *priv;
struct device *dev;
dev = &ls_dev->dev;
priv = dev_get_drvdata(dev);
dpaa2_qdma = priv->dpaa2_qdma;
dpdmai_disable(priv->mc_io, 0, ls_dev->mc_handle);
dpaa2_dpdmai_dpio_unbind(priv);
dpaa2_dpmai_store_free(priv);
dpaa2_dpdmai_dpio_free(priv);
dpdmai_close(priv->mc_io, 0, ls_dev->mc_handle);
fsl_mc_portal_free(priv->mc_io);
dev_set_drvdata(dev, NULL);
dpaa2_dpdmai_free_channels(dpaa2_qdma);
dma_async_device_unregister(&dpaa2_qdma->dma_dev);
kfree(priv);
kfree(dpaa2_qdma);
}
static void dpaa2_qdma_shutdown(struct fsl_mc_device *ls_dev)
{
struct dpaa2_qdma_priv *priv;
struct device *dev;
dev = &ls_dev->dev;
priv = dev_get_drvdata(dev);
dpdmai_disable(priv->mc_io, 0, ls_dev->mc_handle);
dpaa2_dpdmai_dpio_unbind(priv);
dpdmai_close(priv->mc_io, 0, ls_dev->mc_handle);
dpdmai_destroy(priv->mc_io, 0, ls_dev->mc_handle);
}
static const struct fsl_mc_device_id dpaa2_qdma_id_table[] = {
{
.vendor = FSL_MC_VENDOR_FREESCALE,
.obj_type = "dpdmai",
},
{ .vendor = 0x0 }
};
static struct fsl_mc_driver dpaa2_qdma_driver = {
.driver = {
.name = "dpaa2-qdma",
.owner = THIS_MODULE,
},
.probe = dpaa2_qdma_probe,
.remove = dpaa2_qdma_remove,
.shutdown = dpaa2_qdma_shutdown,
.match_id_table = dpaa2_qdma_id_table
};
static int __init dpaa2_qdma_driver_init(void)
{
return fsl_mc_driver_register(&(dpaa2_qdma_driver));
}
late_initcall(dpaa2_qdma_driver_init);
static void __exit fsl_qdma_exit(void)
{
fsl_mc_driver_unregister(&(dpaa2_qdma_driver));
}
module_exit(fsl_qdma_exit);
MODULE_ALIAS("platform:fsl-dpaa2-qdma");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("NXP Layerscape DPAA2 qDMA engine driver");
| linux-master | drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Qualcomm Technologies HIDMA debug file
*
* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*/
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/pm_runtime.h>
#include "hidma.h"
static void hidma_ll_chstats(struct seq_file *s, void *llhndl, u32 tre_ch)
{
struct hidma_lldev *lldev = llhndl;
struct hidma_tre *tre;
u32 length;
dma_addr_t src_start;
dma_addr_t dest_start;
u32 *tre_local;
if (tre_ch >= lldev->nr_tres) {
dev_err(lldev->dev, "invalid TRE number in chstats:%d", tre_ch);
return;
}
tre = &lldev->trepool[tre_ch];
seq_printf(s, "------Channel %d -----\n", tre_ch);
seq_printf(s, "allocated=%d\n", atomic_read(&tre->allocated));
seq_printf(s, "queued = 0x%x\n", tre->queued);
seq_printf(s, "err_info = 0x%x\n", tre->err_info);
seq_printf(s, "err_code = 0x%x\n", tre->err_code);
seq_printf(s, "status = 0x%x\n", tre->status);
seq_printf(s, "idx = 0x%x\n", tre->idx);
seq_printf(s, "dma_sig = 0x%x\n", tre->dma_sig);
seq_printf(s, "dev_name=%s\n", tre->dev_name);
seq_printf(s, "callback=%p\n", tre->callback);
seq_printf(s, "data=%p\n", tre->data);
seq_printf(s, "tre_index = 0x%x\n", tre->tre_index);
tre_local = &tre->tre_local[0];
src_start = tre_local[HIDMA_TRE_SRC_LOW_IDX];
src_start = ((u64) (tre_local[HIDMA_TRE_SRC_HI_IDX]) << 32) + src_start;
dest_start = tre_local[HIDMA_TRE_DEST_LOW_IDX];
dest_start += ((u64) (tre_local[HIDMA_TRE_DEST_HI_IDX]) << 32);
length = tre_local[HIDMA_TRE_LEN_IDX];
seq_printf(s, "src=%pap\n", &src_start);
seq_printf(s, "dest=%pap\n", &dest_start);
seq_printf(s, "length = 0x%x\n", length);
}
static void hidma_ll_devstats(struct seq_file *s, void *llhndl)
{
struct hidma_lldev *lldev = llhndl;
seq_puts(s, "------Device -----\n");
seq_printf(s, "lldev init = 0x%x\n", lldev->initialized);
seq_printf(s, "trch_state = 0x%x\n", lldev->trch_state);
seq_printf(s, "evch_state = 0x%x\n", lldev->evch_state);
seq_printf(s, "chidx = 0x%x\n", lldev->chidx);
seq_printf(s, "nr_tres = 0x%x\n", lldev->nr_tres);
seq_printf(s, "trca=%p\n", lldev->trca);
seq_printf(s, "tre_ring=%p\n", lldev->tre_ring);
seq_printf(s, "tre_ring_handle=%pap\n", &lldev->tre_dma);
seq_printf(s, "tre_ring_size = 0x%x\n", lldev->tre_ring_size);
seq_printf(s, "tre_processed_off = 0x%x\n", lldev->tre_processed_off);
seq_printf(s, "pending_tre_count=%d\n",
atomic_read(&lldev->pending_tre_count));
seq_printf(s, "evca=%p\n", lldev->evca);
seq_printf(s, "evre_ring=%p\n", lldev->evre_ring);
seq_printf(s, "evre_ring_handle=%pap\n", &lldev->evre_dma);
seq_printf(s, "evre_ring_size = 0x%x\n", lldev->evre_ring_size);
seq_printf(s, "evre_processed_off = 0x%x\n", lldev->evre_processed_off);
seq_printf(s, "tre_write_offset = 0x%x\n", lldev->tre_write_offset);
}
/*
* hidma_chan_show: display HIDMA channel statistics
*
* Display the statistics for the current HIDMA virtual channel device.
*/
static int hidma_chan_show(struct seq_file *s, void *unused)
{
struct hidma_chan *mchan = s->private;
struct hidma_desc *mdesc;
struct hidma_dev *dmadev = mchan->dmadev;
pm_runtime_get_sync(dmadev->ddev.dev);
seq_printf(s, "paused=%u\n", mchan->paused);
seq_printf(s, "dma_sig=%u\n", mchan->dma_sig);
seq_puts(s, "prepared\n");
list_for_each_entry(mdesc, &mchan->prepared, node)
hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
seq_puts(s, "active\n");
list_for_each_entry(mdesc, &mchan->active, node)
hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
seq_puts(s, "completed\n");
list_for_each_entry(mdesc, &mchan->completed, node)
hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
hidma_ll_devstats(s, mchan->dmadev->lldev);
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
return 0;
}
/*
* hidma_dma_show: display HIDMA device info
*
* Display the info for the current HIDMA device.
*/
static int hidma_dma_show(struct seq_file *s, void *unused)
{
struct hidma_dev *dmadev = s->private;
resource_size_t sz;
seq_printf(s, "nr_descriptors=%d\n", dmadev->nr_descriptors);
seq_printf(s, "dev_trca=%p\n", &dmadev->dev_trca);
seq_printf(s, "dev_trca_phys=%pa\n", &dmadev->trca_resource->start);
sz = resource_size(dmadev->trca_resource);
seq_printf(s, "dev_trca_size=%pa\n", &sz);
seq_printf(s, "dev_evca=%p\n", &dmadev->dev_evca);
seq_printf(s, "dev_evca_phys=%pa\n", &dmadev->evca_resource->start);
sz = resource_size(dmadev->evca_resource);
seq_printf(s, "dev_evca_size=%pa\n", &sz);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(hidma_chan);
DEFINE_SHOW_ATTRIBUTE(hidma_dma);
void hidma_debug_uninit(struct hidma_dev *dmadev)
{
debugfs_remove_recursive(dmadev->debugfs);
}
void hidma_debug_init(struct hidma_dev *dmadev)
{
int chidx = 0;
struct list_head *position = NULL;
struct dentry *dir;
dmadev->debugfs = debugfs_create_dir(dev_name(dmadev->ddev.dev), NULL);
/* walk through the virtual channel list */
list_for_each(position, &dmadev->ddev.channels) {
struct hidma_chan *chan;
chan = list_entry(position, struct hidma_chan,
chan.device_node);
sprintf(chan->dbg_name, "chan%d", chidx);
dir = debugfs_create_dir(chan->dbg_name,
dmadev->debugfs);
debugfs_create_file("stats", S_IRUGO, dir, chan,
&hidma_chan_fops);
chidx++;
}
debugfs_create_file("stats", S_IRUGO, dmadev->debugfs, dmadev,
&hidma_dma_fops);
}
| linux-master | drivers/dma/qcom/hidma_dbg.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Qualcomm Technologies HIDMA DMA engine low level code
*
* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*/
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/atomic.h>
#include <linux/iopoll.h>
#include <linux/kfifo.h>
#include <linux/bitops.h>
#include "hidma.h"
#define HIDMA_EVRE_SIZE 16 /* each EVRE is 16 bytes */
#define HIDMA_TRCA_CTRLSTS_REG 0x000
#define HIDMA_TRCA_RING_LOW_REG 0x008
#define HIDMA_TRCA_RING_HIGH_REG 0x00C
#define HIDMA_TRCA_RING_LEN_REG 0x010
#define HIDMA_TRCA_DOORBELL_REG 0x400
#define HIDMA_EVCA_CTRLSTS_REG 0x000
#define HIDMA_EVCA_INTCTRL_REG 0x004
#define HIDMA_EVCA_RING_LOW_REG 0x008
#define HIDMA_EVCA_RING_HIGH_REG 0x00C
#define HIDMA_EVCA_RING_LEN_REG 0x010
#define HIDMA_EVCA_WRITE_PTR_REG 0x020
#define HIDMA_EVCA_DOORBELL_REG 0x400
#define HIDMA_EVCA_IRQ_STAT_REG 0x100
#define HIDMA_EVCA_IRQ_CLR_REG 0x108
#define HIDMA_EVCA_IRQ_EN_REG 0x110
#define HIDMA_EVRE_CFG_IDX 0
#define HIDMA_EVRE_ERRINFO_BIT_POS 24
#define HIDMA_EVRE_CODE_BIT_POS 28
#define HIDMA_EVRE_ERRINFO_MASK GENMASK(3, 0)
#define HIDMA_EVRE_CODE_MASK GENMASK(3, 0)
#define HIDMA_CH_CONTROL_MASK GENMASK(7, 0)
#define HIDMA_CH_STATE_MASK GENMASK(7, 0)
#define HIDMA_CH_STATE_BIT_POS 0x8
#define HIDMA_IRQ_EV_CH_EOB_IRQ_BIT_POS 0
#define HIDMA_IRQ_EV_CH_WR_RESP_BIT_POS 1
#define HIDMA_IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS 9
#define HIDMA_IRQ_TR_CH_DATA_RD_ER_BIT_POS 10
#define HIDMA_IRQ_TR_CH_DATA_WR_ER_BIT_POS 11
#define HIDMA_IRQ_TR_CH_INVALID_TRE_BIT_POS 14
#define ENABLE_IRQS (BIT(HIDMA_IRQ_EV_CH_EOB_IRQ_BIT_POS) | \
BIT(HIDMA_IRQ_EV_CH_WR_RESP_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_DATA_RD_ER_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_DATA_WR_ER_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_INVALID_TRE_BIT_POS))
#define HIDMA_INCREMENT_ITERATOR(iter, size, ring_size) \
do { \
iter += size; \
if (iter >= ring_size) \
iter -= ring_size; \
} while (0)
#define HIDMA_CH_STATE(val) \
((val >> HIDMA_CH_STATE_BIT_POS) & HIDMA_CH_STATE_MASK)
#define HIDMA_ERR_INT_MASK \
(BIT(HIDMA_IRQ_TR_CH_INVALID_TRE_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS) | \
BIT(HIDMA_IRQ_EV_CH_WR_RESP_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_DATA_RD_ER_BIT_POS) | \
BIT(HIDMA_IRQ_TR_CH_DATA_WR_ER_BIT_POS))
enum ch_command {
HIDMA_CH_DISABLE = 0,
HIDMA_CH_ENABLE = 1,
HIDMA_CH_SUSPEND = 2,
HIDMA_CH_RESET = 9,
};
enum ch_state {
HIDMA_CH_DISABLED = 0,
HIDMA_CH_ENABLED = 1,
HIDMA_CH_RUNNING = 2,
HIDMA_CH_SUSPENDED = 3,
HIDMA_CH_STOPPED = 4,
};
enum err_code {
HIDMA_EVRE_STATUS_COMPLETE = 1,
HIDMA_EVRE_STATUS_ERROR = 4,
};
static int hidma_is_chan_enabled(int state)
{
switch (state) {
case HIDMA_CH_ENABLED:
case HIDMA_CH_RUNNING:
return true;
default:
return false;
}
}
void hidma_ll_free(struct hidma_lldev *lldev, u32 tre_ch)
{
struct hidma_tre *tre;
if (tre_ch >= lldev->nr_tres) {
dev_err(lldev->dev, "invalid TRE number in free:%d", tre_ch);
return;
}
tre = &lldev->trepool[tre_ch];
if (atomic_read(&tre->allocated) != true) {
dev_err(lldev->dev, "trying to free an unused TRE:%d", tre_ch);
return;
}
atomic_set(&tre->allocated, 0);
}
int hidma_ll_request(struct hidma_lldev *lldev, u32 sig, const char *dev_name,
void (*callback)(void *data), void *data, u32 *tre_ch)
{
unsigned int i;
struct hidma_tre *tre;
u32 *tre_local;
if (!tre_ch || !lldev)
return -EINVAL;
/* need to have at least one empty spot in the queue */
for (i = 0; i < lldev->nr_tres - 1; i++) {
if (atomic_add_unless(&lldev->trepool[i].allocated, 1, 1))
break;
}
if (i == (lldev->nr_tres - 1))
return -ENOMEM;
tre = &lldev->trepool[i];
tre->dma_sig = sig;
tre->dev_name = dev_name;
tre->callback = callback;
tre->data = data;
tre->idx = i;
tre->status = 0;
tre->queued = 0;
tre->err_code = 0;
tre->err_info = 0;
tre->lldev = lldev;
tre_local = &tre->tre_local[0];
tre_local[HIDMA_TRE_CFG_IDX] = (lldev->chidx & 0xFF) << 8;
tre_local[HIDMA_TRE_CFG_IDX] |= BIT(16); /* set IEOB */
*tre_ch = i;
if (callback)
callback(data);
return 0;
}
/*
* Multiple TREs may be queued and waiting in the pending queue.
*/
static void hidma_ll_tre_complete(struct tasklet_struct *t)
{
struct hidma_lldev *lldev = from_tasklet(lldev, t, task);
struct hidma_tre *tre;
while (kfifo_out(&lldev->handoff_fifo, &tre, 1)) {
/* call the user if it has been read by the hardware */
if (tre->callback)
tre->callback(tre->data);
}
}
static int hidma_post_completed(struct hidma_lldev *lldev, u8 err_info,
u8 err_code)
{
struct hidma_tre *tre;
unsigned long flags;
u32 tre_iterator;
spin_lock_irqsave(&lldev->lock, flags);
tre_iterator = lldev->tre_processed_off;
tre = lldev->pending_tre_list[tre_iterator / HIDMA_TRE_SIZE];
if (!tre) {
spin_unlock_irqrestore(&lldev->lock, flags);
dev_warn(lldev->dev, "tre_index [%d] and tre out of sync\n",
tre_iterator / HIDMA_TRE_SIZE);
return -EINVAL;
}
lldev->pending_tre_list[tre->tre_index] = NULL;
/*
* Keep track of pending TREs that SW is expecting to receive
* from HW. We got one now. Decrement our counter.
*/
if (atomic_dec_return(&lldev->pending_tre_count) < 0) {
dev_warn(lldev->dev, "tre count mismatch on completion");
atomic_set(&lldev->pending_tre_count, 0);
}
HIDMA_INCREMENT_ITERATOR(tre_iterator, HIDMA_TRE_SIZE,
lldev->tre_ring_size);
lldev->tre_processed_off = tre_iterator;
spin_unlock_irqrestore(&lldev->lock, flags);
tre->err_info = err_info;
tre->err_code = err_code;
tre->queued = 0;
kfifo_put(&lldev->handoff_fifo, tre);
tasklet_schedule(&lldev->task);
return 0;
}
/*
* Called to handle the interrupt for the channel.
* Return a positive number if TRE or EVRE were consumed on this run.
* Return a positive number if there are pending TREs or EVREs.
* Return 0 if there is nothing to consume or no pending TREs/EVREs found.
*/
static int hidma_handle_tre_completion(struct hidma_lldev *lldev)
{
u32 evre_ring_size = lldev->evre_ring_size;
u32 err_info, err_code, evre_write_off;
u32 evre_iterator;
u32 num_completed = 0;
evre_write_off = readl_relaxed(lldev->evca + HIDMA_EVCA_WRITE_PTR_REG);
evre_iterator = lldev->evre_processed_off;
if ((evre_write_off > evre_ring_size) ||
(evre_write_off % HIDMA_EVRE_SIZE)) {
dev_err(lldev->dev, "HW reports invalid EVRE write offset\n");
return 0;
}
/*
* By the time control reaches here the number of EVREs and TREs
* may not match. Only consume the ones that hardware told us.
*/
while ((evre_iterator != evre_write_off)) {
u32 *current_evre = lldev->evre_ring + evre_iterator;
u32 cfg;
cfg = current_evre[HIDMA_EVRE_CFG_IDX];
err_info = cfg >> HIDMA_EVRE_ERRINFO_BIT_POS;
err_info &= HIDMA_EVRE_ERRINFO_MASK;
err_code =
(cfg >> HIDMA_EVRE_CODE_BIT_POS) & HIDMA_EVRE_CODE_MASK;
if (hidma_post_completed(lldev, err_info, err_code))
break;
HIDMA_INCREMENT_ITERATOR(evre_iterator, HIDMA_EVRE_SIZE,
evre_ring_size);
/*
* Read the new event descriptor written by the HW.
* As we are processing the delivered events, other events
* get queued to the SW for processing.
*/
evre_write_off =
readl_relaxed(lldev->evca + HIDMA_EVCA_WRITE_PTR_REG);
num_completed++;
/*
* An error interrupt might have arrived while we are processing
* the completed interrupt.
*/
if (!hidma_ll_isenabled(lldev))
break;
}
if (num_completed) {
u32 evre_read_off = (lldev->evre_processed_off +
HIDMA_EVRE_SIZE * num_completed);
evre_read_off = evre_read_off % evre_ring_size;
writel(evre_read_off, lldev->evca + HIDMA_EVCA_DOORBELL_REG);
/* record the last processed tre offset */
lldev->evre_processed_off = evre_read_off;
}
return num_completed;
}
void hidma_cleanup_pending_tre(struct hidma_lldev *lldev, u8 err_info,
u8 err_code)
{
while (atomic_read(&lldev->pending_tre_count)) {
if (hidma_post_completed(lldev, err_info, err_code))
break;
}
}
static int hidma_ll_reset(struct hidma_lldev *lldev)
{
u32 val;
int ret;
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_RESET << 16;
writel(val, lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
/*
* Delay 10ms after reset to allow DMA logic to quiesce.
* Do a polled read up to 1ms and 10ms maximum.
*/
ret = readl_poll_timeout(lldev->trca + HIDMA_TRCA_CTRLSTS_REG, val,
HIDMA_CH_STATE(val) == HIDMA_CH_DISABLED,
1000, 10000);
if (ret) {
dev_err(lldev->dev, "transfer channel did not reset\n");
return ret;
}
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_RESET << 16;
writel(val, lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
/*
* Delay 10ms after reset to allow DMA logic to quiesce.
* Do a polled read up to 1ms and 10ms maximum.
*/
ret = readl_poll_timeout(lldev->evca + HIDMA_EVCA_CTRLSTS_REG, val,
HIDMA_CH_STATE(val) == HIDMA_CH_DISABLED,
1000, 10000);
if (ret)
return ret;
lldev->trch_state = HIDMA_CH_DISABLED;
lldev->evch_state = HIDMA_CH_DISABLED;
return 0;
}
/*
* The interrupt handler for HIDMA will try to consume as many pending
* EVRE from the event queue as possible. Each EVRE has an associated
* TRE that holds the user interface parameters. EVRE reports the
* result of the transaction. Hardware guarantees ordering between EVREs
* and TREs. We use last processed offset to figure out which TRE is
* associated with which EVRE. If two TREs are consumed by HW, the EVREs
* are in order in the event ring.
*
* This handler will do a one pass for consuming EVREs. Other EVREs may
* be delivered while we are working. It will try to consume incoming
* EVREs one more time and return.
*
* For unprocessed EVREs, hardware will trigger another interrupt until
* all the interrupt bits are cleared.
*
* Hardware guarantees that by the time interrupt is observed, all data
* transactions in flight are delivered to their respective places and
* are visible to the CPU.
*
* On demand paging for IOMMU is only supported for PCIe via PRI
* (Page Request Interface) not for HIDMA. All other hardware instances
* including HIDMA work on pinned DMA addresses.
*
* HIDMA is not aware of IOMMU presence since it follows the DMA API. All
* IOMMU latency will be built into the data movement time. By the time
* interrupt happens, IOMMU lookups + data movement has already taken place.
*
* While the first read in a typical PCI endpoint ISR flushes all outstanding
* requests traditionally to the destination, this concept does not apply
* here for this HW.
*/
static void hidma_ll_int_handler_internal(struct hidma_lldev *lldev, int cause)
{
unsigned long irqflags;
if (cause & HIDMA_ERR_INT_MASK) {
dev_err(lldev->dev, "error 0x%x, disabling...\n",
cause);
/* Clear out pending interrupts */
writel(cause, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
/* No further submissions. */
hidma_ll_disable(lldev);
/* Driver completes the txn and intimates the client.*/
hidma_cleanup_pending_tre(lldev, 0xFF,
HIDMA_EVRE_STATUS_ERROR);
return;
}
spin_lock_irqsave(&lldev->lock, irqflags);
writel_relaxed(cause, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
spin_unlock_irqrestore(&lldev->lock, irqflags);
/*
* Fine tuned for this HW...
*
* This ISR has been designed for this particular hardware. Relaxed
* read and write accessors are used for performance reasons due to
* interrupt delivery guarantees. Do not copy this code blindly and
* expect that to work.
*
* Try to consume as many EVREs as possible.
*/
hidma_handle_tre_completion(lldev);
}
irqreturn_t hidma_ll_inthandler(int chirq, void *arg)
{
struct hidma_lldev *lldev = arg;
u32 status;
u32 enable;
u32 cause;
status = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
enable = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
cause = status & enable;
while (cause) {
hidma_ll_int_handler_internal(lldev, cause);
/*
* Another interrupt might have arrived while we are
* processing this one. Read the new cause.
*/
status = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
enable = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
cause = status & enable;
}
return IRQ_HANDLED;
}
irqreturn_t hidma_ll_inthandler_msi(int chirq, void *arg, int cause)
{
struct hidma_lldev *lldev = arg;
hidma_ll_int_handler_internal(lldev, cause);
return IRQ_HANDLED;
}
int hidma_ll_enable(struct hidma_lldev *lldev)
{
u32 val;
int ret;
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_ENABLE << 16;
writel(val, lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
ret = readl_poll_timeout(lldev->evca + HIDMA_EVCA_CTRLSTS_REG, val,
hidma_is_chan_enabled(HIDMA_CH_STATE(val)),
1000, 10000);
if (ret) {
dev_err(lldev->dev, "event channel did not get enabled\n");
return ret;
}
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_ENABLE << 16;
writel(val, lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
ret = readl_poll_timeout(lldev->trca + HIDMA_TRCA_CTRLSTS_REG, val,
hidma_is_chan_enabled(HIDMA_CH_STATE(val)),
1000, 10000);
if (ret) {
dev_err(lldev->dev, "transfer channel did not get enabled\n");
return ret;
}
lldev->trch_state = HIDMA_CH_ENABLED;
lldev->evch_state = HIDMA_CH_ENABLED;
/* enable irqs */
writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
return 0;
}
void hidma_ll_start(struct hidma_lldev *lldev)
{
unsigned long irqflags;
spin_lock_irqsave(&lldev->lock, irqflags);
writel(lldev->tre_write_offset, lldev->trca + HIDMA_TRCA_DOORBELL_REG);
spin_unlock_irqrestore(&lldev->lock, irqflags);
}
bool hidma_ll_isenabled(struct hidma_lldev *lldev)
{
u32 val;
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
lldev->trch_state = HIDMA_CH_STATE(val);
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
lldev->evch_state = HIDMA_CH_STATE(val);
/* both channels have to be enabled before calling this function */
if (hidma_is_chan_enabled(lldev->trch_state) &&
hidma_is_chan_enabled(lldev->evch_state))
return true;
return false;
}
void hidma_ll_queue_request(struct hidma_lldev *lldev, u32 tre_ch)
{
struct hidma_tre *tre;
unsigned long flags;
tre = &lldev->trepool[tre_ch];
/* copy the TRE into its location in the TRE ring */
spin_lock_irqsave(&lldev->lock, flags);
tre->tre_index = lldev->tre_write_offset / HIDMA_TRE_SIZE;
lldev->pending_tre_list[tre->tre_index] = tre;
memcpy(lldev->tre_ring + lldev->tre_write_offset,
&tre->tre_local[0], HIDMA_TRE_SIZE);
tre->err_code = 0;
tre->err_info = 0;
tre->queued = 1;
atomic_inc(&lldev->pending_tre_count);
lldev->tre_write_offset = (lldev->tre_write_offset + HIDMA_TRE_SIZE)
% lldev->tre_ring_size;
spin_unlock_irqrestore(&lldev->lock, flags);
}
/*
* Note that even though we stop this channel if there is a pending transaction
* in flight it will complete and follow the callback. This request will
* prevent further requests to be made.
*/
int hidma_ll_disable(struct hidma_lldev *lldev)
{
u32 val;
int ret;
/* The channel needs to be in working state */
if (!hidma_ll_isenabled(lldev))
return 0;
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_SUSPEND << 16;
writel(val, lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
/*
* Start the wait right after the suspend is confirmed.
* Do a polled read up to 1ms and 10ms maximum.
*/
ret = readl_poll_timeout(lldev->trca + HIDMA_TRCA_CTRLSTS_REG, val,
HIDMA_CH_STATE(val) == HIDMA_CH_SUSPENDED,
1000, 10000);
if (ret)
return ret;
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
val &= ~(HIDMA_CH_CONTROL_MASK << 16);
val |= HIDMA_CH_SUSPEND << 16;
writel(val, lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
/*
* Start the wait right after the suspend is confirmed
* Delay up to 10ms after reset to allow DMA logic to quiesce.
*/
ret = readl_poll_timeout(lldev->evca + HIDMA_EVCA_CTRLSTS_REG, val,
HIDMA_CH_STATE(val) == HIDMA_CH_SUSPENDED,
1000, 10000);
if (ret)
return ret;
lldev->trch_state = HIDMA_CH_SUSPENDED;
lldev->evch_state = HIDMA_CH_SUSPENDED;
/* disable interrupts */
writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
return 0;
}
void hidma_ll_set_transfer_params(struct hidma_lldev *lldev, u32 tre_ch,
dma_addr_t src, dma_addr_t dest, u32 len,
u32 flags, u32 txntype)
{
struct hidma_tre *tre;
u32 *tre_local;
if (tre_ch >= lldev->nr_tres) {
dev_err(lldev->dev, "invalid TRE number in transfer params:%d",
tre_ch);
return;
}
tre = &lldev->trepool[tre_ch];
if (atomic_read(&tre->allocated) != true) {
dev_err(lldev->dev, "trying to set params on an unused TRE:%d",
tre_ch);
return;
}
tre_local = &tre->tre_local[0];
tre_local[HIDMA_TRE_CFG_IDX] &= ~GENMASK(7, 0);
tre_local[HIDMA_TRE_CFG_IDX] |= txntype;
tre_local[HIDMA_TRE_LEN_IDX] = len;
tre_local[HIDMA_TRE_SRC_LOW_IDX] = lower_32_bits(src);
tre_local[HIDMA_TRE_SRC_HI_IDX] = upper_32_bits(src);
tre_local[HIDMA_TRE_DEST_LOW_IDX] = lower_32_bits(dest);
tre_local[HIDMA_TRE_DEST_HI_IDX] = upper_32_bits(dest);
tre->int_flags = flags;
}
/*
* Called during initialization and after an error condition
* to restore hardware state.
*/
int hidma_ll_setup(struct hidma_lldev *lldev)
{
int rc;
u64 addr;
u32 val;
u32 nr_tres = lldev->nr_tres;
atomic_set(&lldev->pending_tre_count, 0);
lldev->tre_processed_off = 0;
lldev->evre_processed_off = 0;
lldev->tre_write_offset = 0;
/* disable interrupts */
writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
/* clear all pending interrupts */
val = readl(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
writel(val, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
rc = hidma_ll_reset(lldev);
if (rc)
return rc;
/*
* Clear all pending interrupts again.
* Otherwise, we observe reset complete interrupts.
*/
val = readl(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
writel(val, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
/* disable interrupts again after reset */
writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
addr = lldev->tre_dma;
writel(lower_32_bits(addr), lldev->trca + HIDMA_TRCA_RING_LOW_REG);
writel(upper_32_bits(addr), lldev->trca + HIDMA_TRCA_RING_HIGH_REG);
writel(lldev->tre_ring_size, lldev->trca + HIDMA_TRCA_RING_LEN_REG);
addr = lldev->evre_dma;
writel(lower_32_bits(addr), lldev->evca + HIDMA_EVCA_RING_LOW_REG);
writel(upper_32_bits(addr), lldev->evca + HIDMA_EVCA_RING_HIGH_REG);
writel(HIDMA_EVRE_SIZE * nr_tres,
lldev->evca + HIDMA_EVCA_RING_LEN_REG);
/* configure interrupts */
hidma_ll_setup_irq(lldev, lldev->msi_support);
rc = hidma_ll_enable(lldev);
if (rc)
return rc;
return rc;
}
void hidma_ll_setup_irq(struct hidma_lldev *lldev, bool msi)
{
u32 val;
lldev->msi_support = msi;
/* disable interrupts again after reset */
writel(0, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
/* support IRQ by default */
val = readl(lldev->evca + HIDMA_EVCA_INTCTRL_REG);
val &= ~0xF;
if (!lldev->msi_support)
val = val | 0x1;
writel(val, lldev->evca + HIDMA_EVCA_INTCTRL_REG);
/* clear all pending interrupts and enable them */
writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
}
struct hidma_lldev *hidma_ll_init(struct device *dev, u32 nr_tres,
void __iomem *trca, void __iomem *evca,
u8 chidx)
{
u32 required_bytes;
struct hidma_lldev *lldev;
int rc;
size_t sz;
if (!trca || !evca || !dev || !nr_tres)
return NULL;
/* need at least four TREs */
if (nr_tres < 4)
return NULL;
/* need an extra space */
nr_tres += 1;
lldev = devm_kzalloc(dev, sizeof(struct hidma_lldev), GFP_KERNEL);
if (!lldev)
return NULL;
lldev->evca = evca;
lldev->trca = trca;
lldev->dev = dev;
sz = sizeof(struct hidma_tre);
lldev->trepool = devm_kcalloc(lldev->dev, nr_tres, sz, GFP_KERNEL);
if (!lldev->trepool)
return NULL;
required_bytes = sizeof(lldev->pending_tre_list[0]);
lldev->pending_tre_list = devm_kcalloc(dev, nr_tres, required_bytes,
GFP_KERNEL);
if (!lldev->pending_tre_list)
return NULL;
sz = (HIDMA_TRE_SIZE + 1) * nr_tres;
lldev->tre_ring = dmam_alloc_coherent(dev, sz, &lldev->tre_dma,
GFP_KERNEL);
if (!lldev->tre_ring)
return NULL;
lldev->tre_ring_size = HIDMA_TRE_SIZE * nr_tres;
lldev->nr_tres = nr_tres;
/* the TRE ring has to be TRE_SIZE aligned */
if (!IS_ALIGNED(lldev->tre_dma, HIDMA_TRE_SIZE)) {
u8 tre_ring_shift;
tre_ring_shift = lldev->tre_dma % HIDMA_TRE_SIZE;
tre_ring_shift = HIDMA_TRE_SIZE - tre_ring_shift;
lldev->tre_dma += tre_ring_shift;
lldev->tre_ring += tre_ring_shift;
}
sz = (HIDMA_EVRE_SIZE + 1) * nr_tres;
lldev->evre_ring = dmam_alloc_coherent(dev, sz, &lldev->evre_dma,
GFP_KERNEL);
if (!lldev->evre_ring)
return NULL;
lldev->evre_ring_size = HIDMA_EVRE_SIZE * nr_tres;
/* the EVRE ring has to be EVRE_SIZE aligned */
if (!IS_ALIGNED(lldev->evre_dma, HIDMA_EVRE_SIZE)) {
u8 evre_ring_shift;
evre_ring_shift = lldev->evre_dma % HIDMA_EVRE_SIZE;
evre_ring_shift = HIDMA_EVRE_SIZE - evre_ring_shift;
lldev->evre_dma += evre_ring_shift;
lldev->evre_ring += evre_ring_shift;
}
lldev->nr_tres = nr_tres;
lldev->chidx = chidx;
sz = nr_tres * sizeof(struct hidma_tre *);
rc = kfifo_alloc(&lldev->handoff_fifo, sz, GFP_KERNEL);
if (rc)
return NULL;
rc = hidma_ll_setup(lldev);
if (rc)
return NULL;
spin_lock_init(&lldev->lock);
tasklet_setup(&lldev->task, hidma_ll_tre_complete);
lldev->initialized = 1;
writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
return lldev;
}
int hidma_ll_uninit(struct hidma_lldev *lldev)
{
u32 required_bytes;
int rc = 0;
u32 val;
if (!lldev)
return -ENODEV;
if (!lldev->initialized)
return 0;
lldev->initialized = 0;
required_bytes = sizeof(struct hidma_tre) * lldev->nr_tres;
tasklet_kill(&lldev->task);
memset(lldev->trepool, 0, required_bytes);
lldev->trepool = NULL;
atomic_set(&lldev->pending_tre_count, 0);
lldev->tre_write_offset = 0;
rc = hidma_ll_reset(lldev);
/*
* Clear all pending interrupts again.
* Otherwise, we observe reset complete interrupts.
*/
val = readl(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
writel(val, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
return rc;
}
enum dma_status hidma_ll_status(struct hidma_lldev *lldev, u32 tre_ch)
{
enum dma_status ret = DMA_ERROR;
struct hidma_tre *tre;
unsigned long flags;
u8 err_code;
spin_lock_irqsave(&lldev->lock, flags);
tre = &lldev->trepool[tre_ch];
err_code = tre->err_code;
if (err_code & HIDMA_EVRE_STATUS_COMPLETE)
ret = DMA_COMPLETE;
else if (err_code & HIDMA_EVRE_STATUS_ERROR)
ret = DMA_ERROR;
else
ret = DMA_IN_PROGRESS;
spin_unlock_irqrestore(&lldev->lock, flags);
return ret;
}
| linux-master | drivers/dma/qcom/hidma_ll.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2020, Linaro Limited
*/
#include <dt-bindings/dma/qcom-gpi.h>
#include <linux/bitfield.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/dma/qcom-gpi-dma.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include "../dmaengine.h"
#include "../virt-dma.h"
#define TRE_TYPE_DMA 0x10
#define TRE_TYPE_GO 0x20
#define TRE_TYPE_CONFIG0 0x22
/* TRE flags */
#define TRE_FLAGS_CHAIN BIT(0)
#define TRE_FLAGS_IEOB BIT(8)
#define TRE_FLAGS_IEOT BIT(9)
#define TRE_FLAGS_BEI BIT(10)
#define TRE_FLAGS_LINK BIT(11)
#define TRE_FLAGS_TYPE GENMASK(23, 16)
/* SPI CONFIG0 WD0 */
#define TRE_SPI_C0_WORD_SZ GENMASK(4, 0)
#define TRE_SPI_C0_LOOPBACK BIT(8)
#define TRE_SPI_C0_CS BIT(11)
#define TRE_SPI_C0_CPHA BIT(12)
#define TRE_SPI_C0_CPOL BIT(13)
#define TRE_SPI_C0_TX_PACK BIT(24)
#define TRE_SPI_C0_RX_PACK BIT(25)
/* CONFIG0 WD2 */
#define TRE_C0_CLK_DIV GENMASK(11, 0)
#define TRE_C0_CLK_SRC GENMASK(19, 16)
/* SPI GO WD0 */
#define TRE_SPI_GO_CMD GENMASK(4, 0)
#define TRE_SPI_GO_CS GENMASK(10, 8)
#define TRE_SPI_GO_FRAG BIT(26)
/* GO WD2 */
#define TRE_RX_LEN GENMASK(23, 0)
/* I2C Config0 WD0 */
#define TRE_I2C_C0_TLOW GENMASK(7, 0)
#define TRE_I2C_C0_THIGH GENMASK(15, 8)
#define TRE_I2C_C0_TCYL GENMASK(23, 16)
#define TRE_I2C_C0_TX_PACK BIT(24)
#define TRE_I2C_C0_RX_PACK BIT(25)
/* I2C GO WD0 */
#define TRE_I2C_GO_CMD GENMASK(4, 0)
#define TRE_I2C_GO_ADDR GENMASK(14, 8)
#define TRE_I2C_GO_STRETCH BIT(26)
/* DMA TRE */
#define TRE_DMA_LEN GENMASK(23, 0)
/* Register offsets from gpi-top */
#define GPII_n_CH_k_CNTXT_0_OFFS(n, k) (0x20000 + (0x4000 * (n)) + (0x80 * (k)))
#define GPII_n_CH_k_CNTXT_0_EL_SIZE GENMASK(31, 24)
#define GPII_n_CH_k_CNTXT_0_CHSTATE GENMASK(23, 20)
#define GPII_n_CH_k_CNTXT_0_ERIDX GENMASK(18, 14)
#define GPII_n_CH_k_CNTXT_0_DIR BIT(3)
#define GPII_n_CH_k_CNTXT_0_PROTO GENMASK(2, 0)
#define GPII_n_CH_k_CNTXT_0(el_size, erindex, dir, chtype_proto) \
(FIELD_PREP(GPII_n_CH_k_CNTXT_0_EL_SIZE, el_size) | \
FIELD_PREP(GPII_n_CH_k_CNTXT_0_ERIDX, erindex) | \
FIELD_PREP(GPII_n_CH_k_CNTXT_0_DIR, dir) | \
FIELD_PREP(GPII_n_CH_k_CNTXT_0_PROTO, chtype_proto))
#define GPI_CHTYPE_DIR_IN (0)
#define GPI_CHTYPE_DIR_OUT (1)
#define GPI_CHTYPE_PROTO_GPI (0x2)
#define GPII_n_CH_k_DOORBELL_0_OFFS(n, k) (0x22000 + (0x4000 * (n)) + (0x8 * (k)))
#define GPII_n_CH_CMD_OFFS(n) (0x23008 + (0x4000 * (n)))
#define GPII_n_CH_CMD_OPCODE GENMASK(31, 24)
#define GPII_n_CH_CMD_CHID GENMASK(7, 0)
#define GPII_n_CH_CMD(opcode, chid) \
(FIELD_PREP(GPII_n_CH_CMD_OPCODE, opcode) | \
FIELD_PREP(GPII_n_CH_CMD_CHID, chid))
#define GPII_n_CH_CMD_ALLOCATE (0)
#define GPII_n_CH_CMD_START (1)
#define GPII_n_CH_CMD_STOP (2)
#define GPII_n_CH_CMD_RESET (9)
#define GPII_n_CH_CMD_DE_ALLOC (10)
#define GPII_n_CH_CMD_UART_SW_STALE (32)
#define GPII_n_CH_CMD_UART_RFR_READY (33)
#define GPII_n_CH_CMD_UART_RFR_NOT_READY (34)
/* EV Context Array */
#define GPII_n_EV_CH_k_CNTXT_0_OFFS(n, k) (0x21000 + (0x4000 * (n)) + (0x80 * (k)))
#define GPII_n_EV_k_CNTXT_0_EL_SIZE GENMASK(31, 24)
#define GPII_n_EV_k_CNTXT_0_CHSTATE GENMASK(23, 20)
#define GPII_n_EV_k_CNTXT_0_INTYPE BIT(16)
#define GPII_n_EV_k_CNTXT_0_CHTYPE GENMASK(3, 0)
#define GPII_n_EV_k_CNTXT_0(el_size, inttype, chtype) \
(FIELD_PREP(GPII_n_EV_k_CNTXT_0_EL_SIZE, el_size) | \
FIELD_PREP(GPII_n_EV_k_CNTXT_0_INTYPE, inttype) | \
FIELD_PREP(GPII_n_EV_k_CNTXT_0_CHTYPE, chtype))
#define GPI_INTTYPE_IRQ (1)
#define GPI_CHTYPE_GPI_EV (0x2)
enum CNTXT_OFFS {
CNTXT_0_CONFIG = 0x0,
CNTXT_1_R_LENGTH = 0x4,
CNTXT_2_RING_BASE_LSB = 0x8,
CNTXT_3_RING_BASE_MSB = 0xC,
CNTXT_4_RING_RP_LSB = 0x10,
CNTXT_5_RING_RP_MSB = 0x14,
CNTXT_6_RING_WP_LSB = 0x18,
CNTXT_7_RING_WP_MSB = 0x1C,
CNTXT_8_RING_INT_MOD = 0x20,
CNTXT_9_RING_INTVEC = 0x24,
CNTXT_10_RING_MSI_LSB = 0x28,
CNTXT_11_RING_MSI_MSB = 0x2C,
CNTXT_12_RING_RP_UPDATE_LSB = 0x30,
CNTXT_13_RING_RP_UPDATE_MSB = 0x34,
};
#define GPII_n_EV_CH_k_DOORBELL_0_OFFS(n, k) (0x22100 + (0x4000 * (n)) + (0x8 * (k)))
#define GPII_n_EV_CH_CMD_OFFS(n) (0x23010 + (0x4000 * (n)))
#define GPII_n_EV_CMD_OPCODE GENMASK(31, 24)
#define GPII_n_EV_CMD_CHID GENMASK(7, 0)
#define GPII_n_EV_CMD(opcode, chid) \
(FIELD_PREP(GPII_n_EV_CMD_OPCODE, opcode) | \
FIELD_PREP(GPII_n_EV_CMD_CHID, chid))
#define GPII_n_EV_CH_CMD_ALLOCATE (0x00)
#define GPII_n_EV_CH_CMD_RESET (0x09)
#define GPII_n_EV_CH_CMD_DE_ALLOC (0x0A)
#define GPII_n_CNTXT_TYPE_IRQ_OFFS(n) (0x23080 + (0x4000 * (n)))
/* mask type register */
#define GPII_n_CNTXT_TYPE_IRQ_MSK_OFFS(n) (0x23088 + (0x4000 * (n)))
#define GPII_n_CNTXT_TYPE_IRQ_MSK_BMSK GENMASK(6, 0)
#define GPII_n_CNTXT_TYPE_IRQ_MSK_GENERAL BIT(6)
#define GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB BIT(3)
#define GPII_n_CNTXT_TYPE_IRQ_MSK_GLOB BIT(2)
#define GPII_n_CNTXT_TYPE_IRQ_MSK_EV_CTRL BIT(1)
#define GPII_n_CNTXT_TYPE_IRQ_MSK_CH_CTRL BIT(0)
#define GPII_n_CNTXT_SRC_GPII_CH_IRQ_OFFS(n) (0x23090 + (0x4000 * (n)))
#define GPII_n_CNTXT_SRC_EV_CH_IRQ_OFFS(n) (0x23094 + (0x4000 * (n)))
/* Mask channel control interrupt register */
#define GPII_n_CNTXT_SRC_CH_IRQ_MSK_OFFS(n) (0x23098 + (0x4000 * (n)))
#define GPII_n_CNTXT_SRC_CH_IRQ_MSK_BMSK GENMASK(1, 0)
/* Mask event control interrupt register */
#define GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_OFFS(n) (0x2309C + (0x4000 * (n)))
#define GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_BMSK BIT(0)
#define GPII_n_CNTXT_SRC_CH_IRQ_CLR_OFFS(n) (0x230A0 + (0x4000 * (n)))
#define GPII_n_CNTXT_SRC_EV_CH_IRQ_CLR_OFFS(n) (0x230A4 + (0x4000 * (n)))
/* Mask event interrupt register */
#define GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_OFFS(n) (0x230B8 + (0x4000 * (n)))
#define GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_BMSK BIT(0)
#define GPII_n_CNTXT_SRC_IEOB_IRQ_CLR_OFFS(n) (0x230C0 + (0x4000 * (n)))
#define GPII_n_CNTXT_GLOB_IRQ_STTS_OFFS(n) (0x23100 + (0x4000 * (n)))
#define GPI_GLOB_IRQ_ERROR_INT_MSK BIT(0)
/* GPII specific Global - Enable bit register */
#define GPII_n_CNTXT_GLOB_IRQ_EN_OFFS(n) (0x23108 + (0x4000 * (n)))
#define GPII_n_CNTXT_GLOB_IRQ_CLR_OFFS(n) (0x23110 + (0x4000 * (n)))
#define GPII_n_CNTXT_GPII_IRQ_STTS_OFFS(n) (0x23118 + (0x4000 * (n)))
/* GPII general interrupt - Enable bit register */
#define GPII_n_CNTXT_GPII_IRQ_EN_OFFS(n) (0x23120 + (0x4000 * (n)))
#define GPII_n_CNTXT_GPII_IRQ_EN_BMSK GENMASK(3, 0)
#define GPII_n_CNTXT_GPII_IRQ_CLR_OFFS(n) (0x23128 + (0x4000 * (n)))
/* GPII Interrupt Type register */
#define GPII_n_CNTXT_INTSET_OFFS(n) (0x23180 + (0x4000 * (n)))
#define GPII_n_CNTXT_INTSET_BMSK BIT(0)
#define GPII_n_CNTXT_MSI_BASE_LSB_OFFS(n) (0x23188 + (0x4000 * (n)))
#define GPII_n_CNTXT_MSI_BASE_MSB_OFFS(n) (0x2318C + (0x4000 * (n)))
#define GPII_n_CNTXT_SCRATCH_0_OFFS(n) (0x23400 + (0x4000 * (n)))
#define GPII_n_CNTXT_SCRATCH_1_OFFS(n) (0x23404 + (0x4000 * (n)))
#define GPII_n_ERROR_LOG_OFFS(n) (0x23200 + (0x4000 * (n)))
/* QOS Registers */
#define GPII_n_CH_k_QOS_OFFS(n, k) (0x2005C + (0x4000 * (n)) + (0x80 * (k)))
/* Scratch registers */
#define GPII_n_CH_k_SCRATCH_0_OFFS(n, k) (0x20060 + (0x4000 * (n)) + (0x80 * (k)))
#define GPII_n_CH_k_SCRATCH_0_SEID GENMASK(2, 0)
#define GPII_n_CH_k_SCRATCH_0_PROTO GENMASK(7, 4)
#define GPII_n_CH_k_SCRATCH_0_PAIR GENMASK(20, 16)
#define GPII_n_CH_k_SCRATCH_0(pair, proto, seid) \
(FIELD_PREP(GPII_n_CH_k_SCRATCH_0_PAIR, pair) | \
FIELD_PREP(GPII_n_CH_k_SCRATCH_0_PROTO, proto) | \
FIELD_PREP(GPII_n_CH_k_SCRATCH_0_SEID, seid))
#define GPII_n_CH_k_SCRATCH_1_OFFS(n, k) (0x20064 + (0x4000 * (n)) + (0x80 * (k)))
#define GPII_n_CH_k_SCRATCH_2_OFFS(n, k) (0x20068 + (0x4000 * (n)) + (0x80 * (k)))
#define GPII_n_CH_k_SCRATCH_3_OFFS(n, k) (0x2006C + (0x4000 * (n)) + (0x80 * (k)))
struct __packed gpi_tre {
u32 dword[4];
};
enum msm_gpi_tce_code {
MSM_GPI_TCE_SUCCESS = 1,
MSM_GPI_TCE_EOT = 2,
MSM_GPI_TCE_EOB = 4,
MSM_GPI_TCE_UNEXP_ERR = 16,
};
#define CMD_TIMEOUT_MS (250)
#define MAX_CHANNELS_PER_GPII (2)
#define GPI_TX_CHAN (0)
#define GPI_RX_CHAN (1)
#define STATE_IGNORE (U32_MAX)
#define EV_FACTOR (2)
#define REQ_OF_DMA_ARGS (5) /* # of arguments required from client */
#define CHAN_TRES 64
struct __packed xfer_compl_event {
u64 ptr;
u32 length:24;
u8 code;
u16 status;
u8 type;
u8 chid;
};
struct __packed immediate_data_event {
u8 data_bytes[8];
u8 length:4;
u8 resvd:4;
u16 tre_index;
u8 code;
u16 status;
u8 type;
u8 chid;
};
struct __packed qup_notif_event {
u32 status;
u32 time;
u32 count:24;
u8 resvd;
u16 resvd1;
u8 type;
u8 chid;
};
struct __packed gpi_ere {
u32 dword[4];
};
enum GPI_EV_TYPE {
XFER_COMPLETE_EV_TYPE = 0x22,
IMMEDIATE_DATA_EV_TYPE = 0x30,
QUP_NOTIF_EV_TYPE = 0x31,
STALE_EV_TYPE = 0xFF,
};
union __packed gpi_event {
struct __packed xfer_compl_event xfer_compl_event;
struct __packed immediate_data_event immediate_data_event;
struct __packed qup_notif_event qup_notif_event;
struct __packed gpi_ere gpi_ere;
};
enum gpii_irq_settings {
DEFAULT_IRQ_SETTINGS,
MASK_IEOB_SETTINGS,
};
enum gpi_ev_state {
DEFAULT_EV_CH_STATE = 0,
EV_STATE_NOT_ALLOCATED = DEFAULT_EV_CH_STATE,
EV_STATE_ALLOCATED,
MAX_EV_STATES
};
static const char *const gpi_ev_state_str[MAX_EV_STATES] = {
[EV_STATE_NOT_ALLOCATED] = "NOT ALLOCATED",
[EV_STATE_ALLOCATED] = "ALLOCATED",
};
#define TO_GPI_EV_STATE_STR(_state) (((_state) >= MAX_EV_STATES) ? \
"INVALID" : gpi_ev_state_str[(_state)])
enum gpi_ch_state {
DEFAULT_CH_STATE = 0x0,
CH_STATE_NOT_ALLOCATED = DEFAULT_CH_STATE,
CH_STATE_ALLOCATED = 0x1,
CH_STATE_STARTED = 0x2,
CH_STATE_STOPPED = 0x3,
CH_STATE_STOP_IN_PROC = 0x4,
CH_STATE_ERROR = 0xf,
MAX_CH_STATES
};
enum gpi_cmd {
GPI_CH_CMD_BEGIN,
GPI_CH_CMD_ALLOCATE = GPI_CH_CMD_BEGIN,
GPI_CH_CMD_START,
GPI_CH_CMD_STOP,
GPI_CH_CMD_RESET,
GPI_CH_CMD_DE_ALLOC,
GPI_CH_CMD_UART_SW_STALE,
GPI_CH_CMD_UART_RFR_READY,
GPI_CH_CMD_UART_RFR_NOT_READY,
GPI_CH_CMD_END = GPI_CH_CMD_UART_RFR_NOT_READY,
GPI_EV_CMD_BEGIN,
GPI_EV_CMD_ALLOCATE = GPI_EV_CMD_BEGIN,
GPI_EV_CMD_RESET,
GPI_EV_CMD_DEALLOC,
GPI_EV_CMD_END = GPI_EV_CMD_DEALLOC,
GPI_MAX_CMD,
};
#define IS_CHAN_CMD(_cmd) ((_cmd) <= GPI_CH_CMD_END)
static const char *const gpi_cmd_str[GPI_MAX_CMD] = {
[GPI_CH_CMD_ALLOCATE] = "CH ALLOCATE",
[GPI_CH_CMD_START] = "CH START",
[GPI_CH_CMD_STOP] = "CH STOP",
[GPI_CH_CMD_RESET] = "CH_RESET",
[GPI_CH_CMD_DE_ALLOC] = "DE ALLOC",
[GPI_CH_CMD_UART_SW_STALE] = "UART SW STALE",
[GPI_CH_CMD_UART_RFR_READY] = "UART RFR READY",
[GPI_CH_CMD_UART_RFR_NOT_READY] = "UART RFR NOT READY",
[GPI_EV_CMD_ALLOCATE] = "EV ALLOCATE",
[GPI_EV_CMD_RESET] = "EV RESET",
[GPI_EV_CMD_DEALLOC] = "EV DEALLOC",
};
#define TO_GPI_CMD_STR(_cmd) (((_cmd) >= GPI_MAX_CMD) ? "INVALID" : \
gpi_cmd_str[(_cmd)])
/*
* @DISABLE_STATE: no register access allowed
* @CONFIG_STATE: client has configured the channel
* @PREP_HARDWARE: register access is allowed
* however, no processing EVENTS
* @ACTIVE_STATE: channels are fully operational
* @PREPARE_TERMINATE: graceful termination of channels
* register access is allowed
* @PAUSE_STATE: channels are active, but not processing any events
*/
enum gpi_pm_state {
DISABLE_STATE,
CONFIG_STATE,
PREPARE_HARDWARE,
ACTIVE_STATE,
PREPARE_TERMINATE,
PAUSE_STATE,
MAX_PM_STATE
};
#define REG_ACCESS_VALID(_pm_state) ((_pm_state) >= PREPARE_HARDWARE)
static const char *const gpi_pm_state_str[MAX_PM_STATE] = {
[DISABLE_STATE] = "DISABLE",
[CONFIG_STATE] = "CONFIG",
[PREPARE_HARDWARE] = "PREPARE HARDWARE",
[ACTIVE_STATE] = "ACTIVE",
[PREPARE_TERMINATE] = "PREPARE TERMINATE",
[PAUSE_STATE] = "PAUSE",
};
#define TO_GPI_PM_STR(_state) (((_state) >= MAX_PM_STATE) ? \
"INVALID" : gpi_pm_state_str[(_state)])
static const struct {
enum gpi_cmd gpi_cmd;
u32 opcode;
u32 state;
} gpi_cmd_info[GPI_MAX_CMD] = {
{
GPI_CH_CMD_ALLOCATE,
GPII_n_CH_CMD_ALLOCATE,
CH_STATE_ALLOCATED,
},
{
GPI_CH_CMD_START,
GPII_n_CH_CMD_START,
CH_STATE_STARTED,
},
{
GPI_CH_CMD_STOP,
GPII_n_CH_CMD_STOP,
CH_STATE_STOPPED,
},
{
GPI_CH_CMD_RESET,
GPII_n_CH_CMD_RESET,
CH_STATE_ALLOCATED,
},
{
GPI_CH_CMD_DE_ALLOC,
GPII_n_CH_CMD_DE_ALLOC,
CH_STATE_NOT_ALLOCATED,
},
{
GPI_CH_CMD_UART_SW_STALE,
GPII_n_CH_CMD_UART_SW_STALE,
STATE_IGNORE,
},
{
GPI_CH_CMD_UART_RFR_READY,
GPII_n_CH_CMD_UART_RFR_READY,
STATE_IGNORE,
},
{
GPI_CH_CMD_UART_RFR_NOT_READY,
GPII_n_CH_CMD_UART_RFR_NOT_READY,
STATE_IGNORE,
},
{
GPI_EV_CMD_ALLOCATE,
GPII_n_EV_CH_CMD_ALLOCATE,
EV_STATE_ALLOCATED,
},
{
GPI_EV_CMD_RESET,
GPII_n_EV_CH_CMD_RESET,
EV_STATE_ALLOCATED,
},
{
GPI_EV_CMD_DEALLOC,
GPII_n_EV_CH_CMD_DE_ALLOC,
EV_STATE_NOT_ALLOCATED,
},
};
struct gpi_ring {
void *pre_aligned;
size_t alloc_size;
phys_addr_t phys_addr;
dma_addr_t dma_handle;
void *base;
void *wp;
void *rp;
u32 len;
u32 el_size;
u32 elements;
bool configured;
};
struct gpi_dev {
struct dma_device dma_device;
struct device *dev;
struct resource *res;
void __iomem *regs;
void __iomem *ee_base; /*ee register base address*/
u32 max_gpii; /* maximum # of gpii instances available per gpi block */
u32 gpii_mask; /* gpii instances available for apps */
u32 ev_factor; /* ev ring length factor */
struct gpii *gpiis;
};
struct reg_info {
char *name;
u32 offset;
u32 val;
};
struct gchan {
struct virt_dma_chan vc;
u32 chid;
u32 seid;
u32 protocol;
struct gpii *gpii;
enum gpi_ch_state ch_state;
enum gpi_pm_state pm_state;
void __iomem *ch_cntxt_base_reg;
void __iomem *ch_cntxt_db_reg;
void __iomem *ch_cmd_reg;
u32 dir;
struct gpi_ring ch_ring;
void *config;
};
struct gpii {
u32 gpii_id;
struct gchan gchan[MAX_CHANNELS_PER_GPII];
struct gpi_dev *gpi_dev;
int irq;
void __iomem *regs; /* points to gpi top */
void __iomem *ev_cntxt_base_reg;
void __iomem *ev_cntxt_db_reg;
void __iomem *ev_ring_rp_lsb_reg;
void __iomem *ev_cmd_reg;
void __iomem *ieob_clr_reg;
struct mutex ctrl_lock;
enum gpi_ev_state ev_state;
bool configured_irq;
enum gpi_pm_state pm_state;
rwlock_t pm_lock;
struct gpi_ring ev_ring;
struct tasklet_struct ev_task; /* event processing tasklet */
struct completion cmd_completion;
enum gpi_cmd gpi_cmd;
u32 cntxt_type_irq_msk;
bool ieob_set;
};
#define MAX_TRE 3
struct gpi_desc {
struct virt_dma_desc vd;
size_t len;
void *db; /* DB register to program */
struct gchan *gchan;
struct gpi_tre tre[MAX_TRE];
u32 num_tre;
};
static const u32 GPII_CHAN_DIR[MAX_CHANNELS_PER_GPII] = {
GPI_CHTYPE_DIR_OUT, GPI_CHTYPE_DIR_IN
};
static irqreturn_t gpi_handle_irq(int irq, void *data);
static void gpi_ring_recycle_ev_element(struct gpi_ring *ring);
static int gpi_ring_add_element(struct gpi_ring *ring, void **wp);
static void gpi_process_events(struct gpii *gpii);
static inline struct gchan *to_gchan(struct dma_chan *dma_chan)
{
return container_of(dma_chan, struct gchan, vc.chan);
}
static inline struct gpi_desc *to_gpi_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct gpi_desc, vd);
}
static inline phys_addr_t to_physical(const struct gpi_ring *const ring,
void *addr)
{
return ring->phys_addr + (addr - ring->base);
}
static inline void *to_virtual(const struct gpi_ring *const ring, phys_addr_t addr)
{
return ring->base + (addr - ring->phys_addr);
}
static inline u32 gpi_read_reg(struct gpii *gpii, void __iomem *addr)
{
return readl_relaxed(addr);
}
static inline void gpi_write_reg(struct gpii *gpii, void __iomem *addr, u32 val)
{
writel_relaxed(val, addr);
}
/* gpi_write_reg_field - write to specific bit field */
static inline void gpi_write_reg_field(struct gpii *gpii, void __iomem *addr,
u32 mask, u32 shift, u32 val)
{
u32 tmp = gpi_read_reg(gpii, addr);
tmp &= ~mask;
val = tmp | ((val << shift) & mask);
gpi_write_reg(gpii, addr, val);
}
static __always_inline void
gpi_update_reg(struct gpii *gpii, u32 offset, u32 mask, u32 val)
{
void __iomem *addr = gpii->regs + offset;
u32 tmp = gpi_read_reg(gpii, addr);
tmp &= ~mask;
tmp |= u32_encode_bits(val, mask);
gpi_write_reg(gpii, addr, tmp);
}
static void gpi_disable_interrupts(struct gpii *gpii)
{
gpi_update_reg(gpii, GPII_n_CNTXT_TYPE_IRQ_MSK_OFFS(gpii->gpii_id),
GPII_n_CNTXT_TYPE_IRQ_MSK_BMSK, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_OFFS(gpii->gpii_id),
GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_BMSK, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_SRC_CH_IRQ_MSK_OFFS(gpii->gpii_id),
GPII_n_CNTXT_SRC_CH_IRQ_MSK_BMSK, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_OFFS(gpii->gpii_id),
GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_BMSK, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_GLOB_IRQ_EN_OFFS(gpii->gpii_id),
GPII_n_CNTXT_GPII_IRQ_EN_BMSK, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_GPII_IRQ_EN_OFFS(gpii->gpii_id),
GPII_n_CNTXT_GPII_IRQ_EN_BMSK, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_INTSET_OFFS(gpii->gpii_id),
GPII_n_CNTXT_INTSET_BMSK, 0);
gpii->cntxt_type_irq_msk = 0;
devm_free_irq(gpii->gpi_dev->dev, gpii->irq, gpii);
gpii->configured_irq = false;
}
/* configure and enable interrupts */
static int gpi_config_interrupts(struct gpii *gpii, enum gpii_irq_settings settings, bool mask)
{
const u32 enable = (GPII_n_CNTXT_TYPE_IRQ_MSK_GENERAL |
GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB |
GPII_n_CNTXT_TYPE_IRQ_MSK_GLOB |
GPII_n_CNTXT_TYPE_IRQ_MSK_EV_CTRL |
GPII_n_CNTXT_TYPE_IRQ_MSK_CH_CTRL);
int ret;
if (!gpii->configured_irq) {
ret = devm_request_irq(gpii->gpi_dev->dev, gpii->irq,
gpi_handle_irq, IRQF_TRIGGER_HIGH,
"gpi-dma", gpii);
if (ret < 0) {
dev_err(gpii->gpi_dev->dev, "error request irq:%d ret:%d\n",
gpii->irq, ret);
return ret;
}
}
if (settings == MASK_IEOB_SETTINGS) {
/*
* GPII only uses one EV ring per gpii so we can globally
* enable/disable IEOB interrupt
*/
if (mask)
gpii->cntxt_type_irq_msk |= GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB;
else
gpii->cntxt_type_irq_msk &= ~(GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB);
gpi_update_reg(gpii, GPII_n_CNTXT_TYPE_IRQ_MSK_OFFS(gpii->gpii_id),
GPII_n_CNTXT_TYPE_IRQ_MSK_BMSK, gpii->cntxt_type_irq_msk);
} else {
gpi_update_reg(gpii, GPII_n_CNTXT_TYPE_IRQ_MSK_OFFS(gpii->gpii_id),
GPII_n_CNTXT_TYPE_IRQ_MSK_BMSK, enable);
gpi_update_reg(gpii, GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_OFFS(gpii->gpii_id),
GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_BMSK,
GPII_n_CNTXT_SRC_IEOB_IRQ_MSK_BMSK);
gpi_update_reg(gpii, GPII_n_CNTXT_SRC_CH_IRQ_MSK_OFFS(gpii->gpii_id),
GPII_n_CNTXT_SRC_CH_IRQ_MSK_BMSK,
GPII_n_CNTXT_SRC_CH_IRQ_MSK_BMSK);
gpi_update_reg(gpii, GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_OFFS(gpii->gpii_id),
GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_BMSK,
GPII_n_CNTXT_SRC_EV_CH_IRQ_MSK_BMSK);
gpi_update_reg(gpii, GPII_n_CNTXT_GLOB_IRQ_EN_OFFS(gpii->gpii_id),
GPII_n_CNTXT_GPII_IRQ_EN_BMSK,
GPII_n_CNTXT_GPII_IRQ_EN_BMSK);
gpi_update_reg(gpii, GPII_n_CNTXT_GPII_IRQ_EN_OFFS(gpii->gpii_id),
GPII_n_CNTXT_GPII_IRQ_EN_BMSK, GPII_n_CNTXT_GPII_IRQ_EN_BMSK);
gpi_update_reg(gpii, GPII_n_CNTXT_MSI_BASE_LSB_OFFS(gpii->gpii_id), U32_MAX, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_MSI_BASE_MSB_OFFS(gpii->gpii_id), U32_MAX, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_SCRATCH_0_OFFS(gpii->gpii_id), U32_MAX, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_SCRATCH_1_OFFS(gpii->gpii_id), U32_MAX, 0);
gpi_update_reg(gpii, GPII_n_CNTXT_INTSET_OFFS(gpii->gpii_id),
GPII_n_CNTXT_INTSET_BMSK, 1);
gpi_update_reg(gpii, GPII_n_ERROR_LOG_OFFS(gpii->gpii_id), U32_MAX, 0);
gpii->cntxt_type_irq_msk = enable;
}
gpii->configured_irq = true;
return 0;
}
/* Sends gpii event or channel command */
static int gpi_send_cmd(struct gpii *gpii, struct gchan *gchan,
enum gpi_cmd gpi_cmd)
{
u32 chid = MAX_CHANNELS_PER_GPII;
unsigned long timeout;
void __iomem *cmd_reg;
u32 cmd;
if (gpi_cmd >= GPI_MAX_CMD)
return -EINVAL;
if (IS_CHAN_CMD(gpi_cmd))
chid = gchan->chid;
dev_dbg(gpii->gpi_dev->dev,
"sending cmd: %s:%u\n", TO_GPI_CMD_STR(gpi_cmd), chid);
/* send opcode and wait for completion */
reinit_completion(&gpii->cmd_completion);
gpii->gpi_cmd = gpi_cmd;
cmd_reg = IS_CHAN_CMD(gpi_cmd) ? gchan->ch_cmd_reg : gpii->ev_cmd_reg;
cmd = IS_CHAN_CMD(gpi_cmd) ? GPII_n_CH_CMD(gpi_cmd_info[gpi_cmd].opcode, chid) :
GPII_n_EV_CMD(gpi_cmd_info[gpi_cmd].opcode, 0);
gpi_write_reg(gpii, cmd_reg, cmd);
timeout = wait_for_completion_timeout(&gpii->cmd_completion,
msecs_to_jiffies(CMD_TIMEOUT_MS));
if (!timeout) {
dev_err(gpii->gpi_dev->dev, "cmd: %s completion timeout:%u\n",
TO_GPI_CMD_STR(gpi_cmd), chid);
return -EIO;
}
/* confirm new ch state is correct , if the cmd is a state change cmd */
if (gpi_cmd_info[gpi_cmd].state == STATE_IGNORE)
return 0;
if (IS_CHAN_CMD(gpi_cmd) && gchan->ch_state == gpi_cmd_info[gpi_cmd].state)
return 0;
if (!IS_CHAN_CMD(gpi_cmd) && gpii->ev_state == gpi_cmd_info[gpi_cmd].state)
return 0;
return -EIO;
}
/* program transfer ring DB register */
static inline void gpi_write_ch_db(struct gchan *gchan,
struct gpi_ring *ring, void *wp)
{
struct gpii *gpii = gchan->gpii;
phys_addr_t p_wp;
p_wp = to_physical(ring, wp);
gpi_write_reg(gpii, gchan->ch_cntxt_db_reg, p_wp);
}
/* program event ring DB register */
static inline void gpi_write_ev_db(struct gpii *gpii,
struct gpi_ring *ring, void *wp)
{
phys_addr_t p_wp;
p_wp = ring->phys_addr + (wp - ring->base);
gpi_write_reg(gpii, gpii->ev_cntxt_db_reg, p_wp);
}
/* process transfer completion interrupt */
static void gpi_process_ieob(struct gpii *gpii)
{
gpi_write_reg(gpii, gpii->ieob_clr_reg, BIT(0));
gpi_config_interrupts(gpii, MASK_IEOB_SETTINGS, 0);
tasklet_hi_schedule(&gpii->ev_task);
}
/* process channel control interrupt */
static void gpi_process_ch_ctrl_irq(struct gpii *gpii)
{
u32 gpii_id = gpii->gpii_id;
u32 offset = GPII_n_CNTXT_SRC_GPII_CH_IRQ_OFFS(gpii_id);
u32 ch_irq = gpi_read_reg(gpii, gpii->regs + offset);
struct gchan *gchan;
u32 chid, state;
/* clear the status */
offset = GPII_n_CNTXT_SRC_CH_IRQ_CLR_OFFS(gpii_id);
gpi_write_reg(gpii, gpii->regs + offset, (u32)ch_irq);
for (chid = 0; chid < MAX_CHANNELS_PER_GPII; chid++) {
if (!(BIT(chid) & ch_irq))
continue;
gchan = &gpii->gchan[chid];
state = gpi_read_reg(gpii, gchan->ch_cntxt_base_reg +
CNTXT_0_CONFIG);
state = FIELD_GET(GPII_n_CH_k_CNTXT_0_CHSTATE, state);
/*
* CH_CMD_DEALLOC cmd always successful. However cmd does
* not change hardware status. So overwriting software state
* to default state.
*/
if (gpii->gpi_cmd == GPI_CH_CMD_DE_ALLOC)
state = DEFAULT_CH_STATE;
gchan->ch_state = state;
/*
* Triggering complete all if ch_state is not a stop in process.
* Stop in process is a transition state and we will wait for
* stop interrupt before notifying.
*/
if (gchan->ch_state != CH_STATE_STOP_IN_PROC)
complete_all(&gpii->cmd_completion);
}
}
/* processing gpi general error interrupts */
static void gpi_process_gen_err_irq(struct gpii *gpii)
{
u32 gpii_id = gpii->gpii_id;
u32 offset = GPII_n_CNTXT_GPII_IRQ_STTS_OFFS(gpii_id);
u32 irq_stts = gpi_read_reg(gpii, gpii->regs + offset);
/* clear the status */
dev_dbg(gpii->gpi_dev->dev, "irq_stts:0x%x\n", irq_stts);
/* Clear the register */
offset = GPII_n_CNTXT_GPII_IRQ_CLR_OFFS(gpii_id);
gpi_write_reg(gpii, gpii->regs + offset, irq_stts);
}
/* processing gpi level error interrupts */
static void gpi_process_glob_err_irq(struct gpii *gpii)
{
u32 gpii_id = gpii->gpii_id;
u32 offset = GPII_n_CNTXT_GLOB_IRQ_STTS_OFFS(gpii_id);
u32 irq_stts = gpi_read_reg(gpii, gpii->regs + offset);
offset = GPII_n_CNTXT_GLOB_IRQ_CLR_OFFS(gpii_id);
gpi_write_reg(gpii, gpii->regs + offset, irq_stts);
/* only error interrupt should be set */
if (irq_stts & ~GPI_GLOB_IRQ_ERROR_INT_MSK) {
dev_err(gpii->gpi_dev->dev, "invalid error status:0x%x\n", irq_stts);
return;
}
offset = GPII_n_ERROR_LOG_OFFS(gpii_id);
gpi_write_reg(gpii, gpii->regs + offset, 0);
}
/* gpii interrupt handler */
static irqreturn_t gpi_handle_irq(int irq, void *data)
{
struct gpii *gpii = data;
u32 gpii_id = gpii->gpii_id;
u32 type, offset;
unsigned long flags;
read_lock_irqsave(&gpii->pm_lock, flags);
/*
* States are out of sync to receive interrupt
* while software state is in DISABLE state, bailing out.
*/
if (!REG_ACCESS_VALID(gpii->pm_state)) {
dev_err(gpii->gpi_dev->dev, "receive interrupt while in %s state\n",
TO_GPI_PM_STR(gpii->pm_state));
goto exit_irq;
}
offset = GPII_n_CNTXT_TYPE_IRQ_OFFS(gpii->gpii_id);
type = gpi_read_reg(gpii, gpii->regs + offset);
do {
/* global gpii error */
if (type & GPII_n_CNTXT_TYPE_IRQ_MSK_GLOB) {
gpi_process_glob_err_irq(gpii);
type &= ~(GPII_n_CNTXT_TYPE_IRQ_MSK_GLOB);
}
/* transfer complete interrupt */
if (type & GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB) {
gpi_process_ieob(gpii);
type &= ~GPII_n_CNTXT_TYPE_IRQ_MSK_IEOB;
}
/* event control irq */
if (type & GPII_n_CNTXT_TYPE_IRQ_MSK_EV_CTRL) {
u32 ev_state;
u32 ev_ch_irq;
dev_dbg(gpii->gpi_dev->dev,
"processing EV CTRL interrupt\n");
offset = GPII_n_CNTXT_SRC_EV_CH_IRQ_OFFS(gpii_id);
ev_ch_irq = gpi_read_reg(gpii, gpii->regs + offset);
offset = GPII_n_CNTXT_SRC_EV_CH_IRQ_CLR_OFFS
(gpii_id);
gpi_write_reg(gpii, gpii->regs + offset, ev_ch_irq);
ev_state = gpi_read_reg(gpii, gpii->ev_cntxt_base_reg +
CNTXT_0_CONFIG);
ev_state = FIELD_GET(GPII_n_EV_k_CNTXT_0_CHSTATE, ev_state);
/*
* CMD EV_CMD_DEALLOC is always successful. However
* cmd does not change hardware status. So overwriting
* software state to default state.
*/
if (gpii->gpi_cmd == GPI_EV_CMD_DEALLOC)
ev_state = DEFAULT_EV_CH_STATE;
gpii->ev_state = ev_state;
dev_dbg(gpii->gpi_dev->dev, "setting EV state to %s\n",
TO_GPI_EV_STATE_STR(gpii->ev_state));
complete_all(&gpii->cmd_completion);
type &= ~(GPII_n_CNTXT_TYPE_IRQ_MSK_EV_CTRL);
}
/* channel control irq */
if (type & GPII_n_CNTXT_TYPE_IRQ_MSK_CH_CTRL) {
dev_dbg(gpii->gpi_dev->dev, "process CH CTRL interrupts\n");
gpi_process_ch_ctrl_irq(gpii);
type &= ~(GPII_n_CNTXT_TYPE_IRQ_MSK_CH_CTRL);
}
if (type) {
dev_err(gpii->gpi_dev->dev, "Unhandled interrupt status:0x%x\n", type);
gpi_process_gen_err_irq(gpii);
goto exit_irq;
}
offset = GPII_n_CNTXT_TYPE_IRQ_OFFS(gpii->gpii_id);
type = gpi_read_reg(gpii, gpii->regs + offset);
} while (type);
exit_irq:
read_unlock_irqrestore(&gpii->pm_lock, flags);
return IRQ_HANDLED;
}
/* process DMA Immediate completion data events */
static void gpi_process_imed_data_event(struct gchan *gchan,
struct immediate_data_event *imed_event)
{
struct gpii *gpii = gchan->gpii;
struct gpi_ring *ch_ring = &gchan->ch_ring;
void *tre = ch_ring->base + (ch_ring->el_size * imed_event->tre_index);
struct dmaengine_result result;
struct gpi_desc *gpi_desc;
struct virt_dma_desc *vd;
unsigned long flags;
u32 chid;
/*
* If channel not active don't process event
*/
if (gchan->pm_state != ACTIVE_STATE) {
dev_err(gpii->gpi_dev->dev, "skipping processing event because ch @ %s state\n",
TO_GPI_PM_STR(gchan->pm_state));
return;
}
spin_lock_irqsave(&gchan->vc.lock, flags);
vd = vchan_next_desc(&gchan->vc);
if (!vd) {
struct gpi_ere *gpi_ere;
struct gpi_tre *gpi_tre;
spin_unlock_irqrestore(&gchan->vc.lock, flags);
dev_dbg(gpii->gpi_dev->dev, "event without a pending descriptor!\n");
gpi_ere = (struct gpi_ere *)imed_event;
dev_dbg(gpii->gpi_dev->dev,
"Event: %08x %08x %08x %08x\n",
gpi_ere->dword[0], gpi_ere->dword[1],
gpi_ere->dword[2], gpi_ere->dword[3]);
gpi_tre = tre;
dev_dbg(gpii->gpi_dev->dev,
"Pending TRE: %08x %08x %08x %08x\n",
gpi_tre->dword[0], gpi_tre->dword[1],
gpi_tre->dword[2], gpi_tre->dword[3]);
return;
}
gpi_desc = to_gpi_desc(vd);
spin_unlock_irqrestore(&gchan->vc.lock, flags);
/*
* RP pointed by Event is to last TRE processed,
* we need to update ring rp to tre + 1
*/
tre += ch_ring->el_size;
if (tre >= (ch_ring->base + ch_ring->len))
tre = ch_ring->base;
ch_ring->rp = tre;
/* make sure rp updates are immediately visible to all cores */
smp_wmb();
chid = imed_event->chid;
if (imed_event->code == MSM_GPI_TCE_EOT && gpii->ieob_set) {
if (chid == GPI_RX_CHAN)
goto gpi_free_desc;
else
return;
}
if (imed_event->code == MSM_GPI_TCE_UNEXP_ERR)
result.result = DMA_TRANS_ABORTED;
else
result.result = DMA_TRANS_NOERROR;
result.residue = gpi_desc->len - imed_event->length;
dma_cookie_complete(&vd->tx);
dmaengine_desc_get_callback_invoke(&vd->tx, &result);
gpi_free_desc:
spin_lock_irqsave(&gchan->vc.lock, flags);
list_del(&vd->node);
spin_unlock_irqrestore(&gchan->vc.lock, flags);
kfree(gpi_desc);
gpi_desc = NULL;
}
/* processing transfer completion events */
static void gpi_process_xfer_compl_event(struct gchan *gchan,
struct xfer_compl_event *compl_event)
{
struct gpii *gpii = gchan->gpii;
struct gpi_ring *ch_ring = &gchan->ch_ring;
void *ev_rp = to_virtual(ch_ring, compl_event->ptr);
struct virt_dma_desc *vd;
struct gpi_desc *gpi_desc;
struct dmaengine_result result;
unsigned long flags;
u32 chid;
/* only process events on active channel */
if (unlikely(gchan->pm_state != ACTIVE_STATE)) {
dev_err(gpii->gpi_dev->dev, "skipping processing event because ch @ %s state\n",
TO_GPI_PM_STR(gchan->pm_state));
return;
}
spin_lock_irqsave(&gchan->vc.lock, flags);
vd = vchan_next_desc(&gchan->vc);
if (!vd) {
struct gpi_ere *gpi_ere;
spin_unlock_irqrestore(&gchan->vc.lock, flags);
dev_err(gpii->gpi_dev->dev, "Event without a pending descriptor!\n");
gpi_ere = (struct gpi_ere *)compl_event;
dev_err(gpii->gpi_dev->dev,
"Event: %08x %08x %08x %08x\n",
gpi_ere->dword[0], gpi_ere->dword[1],
gpi_ere->dword[2], gpi_ere->dword[3]);
return;
}
gpi_desc = to_gpi_desc(vd);
spin_unlock_irqrestore(&gchan->vc.lock, flags);
/*
* RP pointed by Event is to last TRE processed,
* we need to update ring rp to ev_rp + 1
*/
ev_rp += ch_ring->el_size;
if (ev_rp >= (ch_ring->base + ch_ring->len))
ev_rp = ch_ring->base;
ch_ring->rp = ev_rp;
/* update must be visible to other cores */
smp_wmb();
chid = compl_event->chid;
if (compl_event->code == MSM_GPI_TCE_EOT && gpii->ieob_set) {
if (chid == GPI_RX_CHAN)
goto gpi_free_desc;
else
return;
}
if (compl_event->code == MSM_GPI_TCE_UNEXP_ERR) {
dev_err(gpii->gpi_dev->dev, "Error in Transaction\n");
result.result = DMA_TRANS_ABORTED;
} else {
dev_dbg(gpii->gpi_dev->dev, "Transaction Success\n");
result.result = DMA_TRANS_NOERROR;
}
result.residue = gpi_desc->len - compl_event->length;
dev_dbg(gpii->gpi_dev->dev, "Residue %d\n", result.residue);
dma_cookie_complete(&vd->tx);
dmaengine_desc_get_callback_invoke(&vd->tx, &result);
gpi_free_desc:
spin_lock_irqsave(&gchan->vc.lock, flags);
list_del(&vd->node);
spin_unlock_irqrestore(&gchan->vc.lock, flags);
kfree(gpi_desc);
gpi_desc = NULL;
}
/* process all events */
static void gpi_process_events(struct gpii *gpii)
{
struct gpi_ring *ev_ring = &gpii->ev_ring;
phys_addr_t cntxt_rp;
void *rp;
union gpi_event *gpi_event;
struct gchan *gchan;
u32 chid, type;
cntxt_rp = gpi_read_reg(gpii, gpii->ev_ring_rp_lsb_reg);
rp = to_virtual(ev_ring, cntxt_rp);
do {
while (rp != ev_ring->rp) {
gpi_event = ev_ring->rp;
chid = gpi_event->xfer_compl_event.chid;
type = gpi_event->xfer_compl_event.type;
dev_dbg(gpii->gpi_dev->dev,
"Event: CHID:%u, type:%x %08x %08x %08x %08x\n",
chid, type, gpi_event->gpi_ere.dword[0],
gpi_event->gpi_ere.dword[1], gpi_event->gpi_ere.dword[2],
gpi_event->gpi_ere.dword[3]);
switch (type) {
case XFER_COMPLETE_EV_TYPE:
gchan = &gpii->gchan[chid];
gpi_process_xfer_compl_event(gchan,
&gpi_event->xfer_compl_event);
break;
case STALE_EV_TYPE:
dev_dbg(gpii->gpi_dev->dev, "stale event, not processing\n");
break;
case IMMEDIATE_DATA_EV_TYPE:
gchan = &gpii->gchan[chid];
gpi_process_imed_data_event(gchan,
&gpi_event->immediate_data_event);
break;
case QUP_NOTIF_EV_TYPE:
dev_dbg(gpii->gpi_dev->dev, "QUP_NOTIF_EV_TYPE\n");
break;
default:
dev_dbg(gpii->gpi_dev->dev,
"not supported event type:0x%x\n", type);
}
gpi_ring_recycle_ev_element(ev_ring);
}
gpi_write_ev_db(gpii, ev_ring, ev_ring->wp);
/* clear pending IEOB events */
gpi_write_reg(gpii, gpii->ieob_clr_reg, BIT(0));
cntxt_rp = gpi_read_reg(gpii, gpii->ev_ring_rp_lsb_reg);
rp = to_virtual(ev_ring, cntxt_rp);
} while (rp != ev_ring->rp);
}
/* processing events using tasklet */
static void gpi_ev_tasklet(unsigned long data)
{
struct gpii *gpii = (struct gpii *)data;
read_lock(&gpii->pm_lock);
if (!REG_ACCESS_VALID(gpii->pm_state)) {
read_unlock(&gpii->pm_lock);
dev_err(gpii->gpi_dev->dev, "not processing any events, pm_state:%s\n",
TO_GPI_PM_STR(gpii->pm_state));
return;
}
/* process the events */
gpi_process_events(gpii);
/* enable IEOB, switching back to interrupts */
gpi_config_interrupts(gpii, MASK_IEOB_SETTINGS, 1);
read_unlock(&gpii->pm_lock);
}
/* marks all pending events for the channel as stale */
static void gpi_mark_stale_events(struct gchan *gchan)
{
struct gpii *gpii = gchan->gpii;
struct gpi_ring *ev_ring = &gpii->ev_ring;
u32 cntxt_rp, local_rp;
void *ev_rp;
cntxt_rp = gpi_read_reg(gpii, gpii->ev_ring_rp_lsb_reg);
ev_rp = ev_ring->rp;
local_rp = (u32)to_physical(ev_ring, ev_rp);
while (local_rp != cntxt_rp) {
union gpi_event *gpi_event = ev_rp;
u32 chid = gpi_event->xfer_compl_event.chid;
if (chid == gchan->chid)
gpi_event->xfer_compl_event.type = STALE_EV_TYPE;
ev_rp += ev_ring->el_size;
if (ev_rp >= (ev_ring->base + ev_ring->len))
ev_rp = ev_ring->base;
cntxt_rp = gpi_read_reg(gpii, gpii->ev_ring_rp_lsb_reg);
local_rp = (u32)to_physical(ev_ring, ev_rp);
}
}
/* reset sw state and issue channel reset or de-alloc */
static int gpi_reset_chan(struct gchan *gchan, enum gpi_cmd gpi_cmd)
{
struct gpii *gpii = gchan->gpii;
struct gpi_ring *ch_ring = &gchan->ch_ring;
unsigned long flags;
LIST_HEAD(list);
int ret;
ret = gpi_send_cmd(gpii, gchan, gpi_cmd);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error with cmd:%s ret:%d\n",
TO_GPI_CMD_STR(gpi_cmd), ret);
return ret;
}
/* initialize the local ring ptrs */
ch_ring->rp = ch_ring->base;
ch_ring->wp = ch_ring->base;
/* visible to other cores */
smp_wmb();
/* check event ring for any stale events */
write_lock_irq(&gpii->pm_lock);
gpi_mark_stale_events(gchan);
/* remove all async descriptors */
spin_lock_irqsave(&gchan->vc.lock, flags);
vchan_get_all_descriptors(&gchan->vc, &list);
spin_unlock_irqrestore(&gchan->vc.lock, flags);
write_unlock_irq(&gpii->pm_lock);
vchan_dma_desc_free_list(&gchan->vc, &list);
return 0;
}
static int gpi_start_chan(struct gchan *gchan)
{
struct gpii *gpii = gchan->gpii;
int ret;
ret = gpi_send_cmd(gpii, gchan, GPI_CH_CMD_START);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error with cmd:%s ret:%d\n",
TO_GPI_CMD_STR(GPI_CH_CMD_START), ret);
return ret;
}
/* gpii CH is active now */
write_lock_irq(&gpii->pm_lock);
gchan->pm_state = ACTIVE_STATE;
write_unlock_irq(&gpii->pm_lock);
return 0;
}
static int gpi_stop_chan(struct gchan *gchan)
{
struct gpii *gpii = gchan->gpii;
int ret;
ret = gpi_send_cmd(gpii, gchan, GPI_CH_CMD_STOP);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error with cmd:%s ret:%d\n",
TO_GPI_CMD_STR(GPI_CH_CMD_STOP), ret);
return ret;
}
return 0;
}
/* allocate and configure the transfer channel */
static int gpi_alloc_chan(struct gchan *chan, bool send_alloc_cmd)
{
struct gpii *gpii = chan->gpii;
struct gpi_ring *ring = &chan->ch_ring;
int ret;
u32 id = gpii->gpii_id;
u32 chid = chan->chid;
u32 pair_chid = !chid;
if (send_alloc_cmd) {
ret = gpi_send_cmd(gpii, chan, GPI_CH_CMD_ALLOCATE);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error with cmd:%s ret:%d\n",
TO_GPI_CMD_STR(GPI_CH_CMD_ALLOCATE), ret);
return ret;
}
}
gpi_write_reg(gpii, chan->ch_cntxt_base_reg + CNTXT_0_CONFIG,
GPII_n_CH_k_CNTXT_0(ring->el_size, 0, chan->dir, GPI_CHTYPE_PROTO_GPI));
gpi_write_reg(gpii, chan->ch_cntxt_base_reg + CNTXT_1_R_LENGTH, ring->len);
gpi_write_reg(gpii, chan->ch_cntxt_base_reg + CNTXT_2_RING_BASE_LSB, ring->phys_addr);
gpi_write_reg(gpii, chan->ch_cntxt_base_reg + CNTXT_3_RING_BASE_MSB,
upper_32_bits(ring->phys_addr));
gpi_write_reg(gpii, chan->ch_cntxt_db_reg + CNTXT_5_RING_RP_MSB - CNTXT_4_RING_RP_LSB,
upper_32_bits(ring->phys_addr));
gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_SCRATCH_0_OFFS(id, chid),
GPII_n_CH_k_SCRATCH_0(pair_chid, chan->protocol, chan->seid));
gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_SCRATCH_1_OFFS(id, chid), 0);
gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_SCRATCH_2_OFFS(id, chid), 0);
gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_SCRATCH_3_OFFS(id, chid), 0);
gpi_write_reg(gpii, gpii->regs + GPII_n_CH_k_QOS_OFFS(id, chid), 1);
/* flush all the writes */
wmb();
return 0;
}
/* allocate and configure event ring */
static int gpi_alloc_ev_chan(struct gpii *gpii)
{
struct gpi_ring *ring = &gpii->ev_ring;
void __iomem *base = gpii->ev_cntxt_base_reg;
int ret;
ret = gpi_send_cmd(gpii, NULL, GPI_EV_CMD_ALLOCATE);
if (ret) {
dev_err(gpii->gpi_dev->dev, "error with cmd:%s ret:%d\n",
TO_GPI_CMD_STR(GPI_EV_CMD_ALLOCATE), ret);
return ret;
}
/* program event context */
gpi_write_reg(gpii, base + CNTXT_0_CONFIG,
GPII_n_EV_k_CNTXT_0(ring->el_size, GPI_INTTYPE_IRQ, GPI_CHTYPE_GPI_EV));
gpi_write_reg(gpii, base + CNTXT_1_R_LENGTH, ring->len);
gpi_write_reg(gpii, base + CNTXT_2_RING_BASE_LSB, lower_32_bits(ring->phys_addr));
gpi_write_reg(gpii, base + CNTXT_3_RING_BASE_MSB, upper_32_bits(ring->phys_addr));
gpi_write_reg(gpii, gpii->ev_cntxt_db_reg + CNTXT_5_RING_RP_MSB - CNTXT_4_RING_RP_LSB,
upper_32_bits(ring->phys_addr));
gpi_write_reg(gpii, base + CNTXT_8_RING_INT_MOD, 0);
gpi_write_reg(gpii, base + CNTXT_10_RING_MSI_LSB, 0);
gpi_write_reg(gpii, base + CNTXT_11_RING_MSI_MSB, 0);
gpi_write_reg(gpii, base + CNTXT_8_RING_INT_MOD, 0);
gpi_write_reg(gpii, base + CNTXT_12_RING_RP_UPDATE_LSB, 0);
gpi_write_reg(gpii, base + CNTXT_13_RING_RP_UPDATE_MSB, 0);
/* add events to ring */
ring->wp = (ring->base + ring->len - ring->el_size);
/* flush all the writes */
wmb();
/* gpii is active now */
write_lock_irq(&gpii->pm_lock);
gpii->pm_state = ACTIVE_STATE;
write_unlock_irq(&gpii->pm_lock);
gpi_write_ev_db(gpii, ring, ring->wp);
return 0;
}
/* calculate # of ERE/TRE available to queue */
static int gpi_ring_num_elements_avail(const struct gpi_ring * const ring)
{
int elements = 0;
if (ring->wp < ring->rp) {
elements = ((ring->rp - ring->wp) / ring->el_size) - 1;
} else {
elements = (ring->rp - ring->base) / ring->el_size;
elements += ((ring->base + ring->len - ring->wp) / ring->el_size) - 1;
}
return elements;
}
static int gpi_ring_add_element(struct gpi_ring *ring, void **wp)
{
if (gpi_ring_num_elements_avail(ring) <= 0)
return -ENOMEM;
*wp = ring->wp;
ring->wp += ring->el_size;
if (ring->wp >= (ring->base + ring->len))
ring->wp = ring->base;
/* visible to other cores */
smp_wmb();
return 0;
}
static void gpi_ring_recycle_ev_element(struct gpi_ring *ring)
{
/* Update the WP */
ring->wp += ring->el_size;
if (ring->wp >= (ring->base + ring->len))
ring->wp = ring->base;
/* Update the RP */
ring->rp += ring->el_size;
if (ring->rp >= (ring->base + ring->len))
ring->rp = ring->base;
/* visible to other cores */
smp_wmb();
}
static void gpi_free_ring(struct gpi_ring *ring,
struct gpii *gpii)
{
dma_free_coherent(gpii->gpi_dev->dev, ring->alloc_size,
ring->pre_aligned, ring->dma_handle);
memset(ring, 0, sizeof(*ring));
}
/* allocate memory for transfer and event rings */
static int gpi_alloc_ring(struct gpi_ring *ring, u32 elements,
u32 el_size, struct gpii *gpii)
{
u64 len = elements * el_size;
int bit;
/* ring len must be power of 2 */
bit = find_last_bit((unsigned long *)&len, 32);
if (((1 << bit) - 1) & len)
bit++;
len = 1 << bit;
ring->alloc_size = (len + (len - 1));
dev_dbg(gpii->gpi_dev->dev,
"#el:%u el_size:%u len:%u actual_len:%llu alloc_size:%zu\n",
elements, el_size, (elements * el_size), len,
ring->alloc_size);
ring->pre_aligned = dma_alloc_coherent(gpii->gpi_dev->dev,
ring->alloc_size,
&ring->dma_handle, GFP_KERNEL);
if (!ring->pre_aligned) {
dev_err(gpii->gpi_dev->dev, "could not alloc size:%zu mem for ring\n",
ring->alloc_size);
return -ENOMEM;
}
/* align the physical mem */
ring->phys_addr = (ring->dma_handle + (len - 1)) & ~(len - 1);
ring->base = ring->pre_aligned + (ring->phys_addr - ring->dma_handle);
ring->rp = ring->base;
ring->wp = ring->base;
ring->len = len;
ring->el_size = el_size;
ring->elements = ring->len / ring->el_size;
memset(ring->base, 0, ring->len);
ring->configured = true;
/* update to other cores */
smp_wmb();
dev_dbg(gpii->gpi_dev->dev,
"phy_pre:%pad phy_alig:%pa len:%u el_size:%u elements:%u\n",
&ring->dma_handle, &ring->phys_addr, ring->len,
ring->el_size, ring->elements);
return 0;
}
/* copy tre into transfer ring */
static void gpi_queue_xfer(struct gpii *gpii, struct gchan *gchan,
struct gpi_tre *gpi_tre, void **wp)
{
struct gpi_tre *ch_tre;
int ret;
/* get next tre location we can copy */
ret = gpi_ring_add_element(&gchan->ch_ring, (void **)&ch_tre);
if (unlikely(ret)) {
dev_err(gpii->gpi_dev->dev, "Error adding ring element to xfer ring\n");
return;
}
/* copy the tre info */
memcpy(ch_tre, gpi_tre, sizeof(*ch_tre));
*wp = ch_tre;
}
/* reset and restart transfer channel */
static int gpi_terminate_all(struct dma_chan *chan)
{
struct gchan *gchan = to_gchan(chan);
struct gpii *gpii = gchan->gpii;
int schid, echid, i;
int ret = 0;
mutex_lock(&gpii->ctrl_lock);
/*
* treat both channels as a group if its protocol is not UART
* STOP, RESET, or START needs to be in lockstep
*/
schid = (gchan->protocol == QCOM_GPI_UART) ? gchan->chid : 0;
echid = (gchan->protocol == QCOM_GPI_UART) ? schid + 1 : MAX_CHANNELS_PER_GPII;
/* stop the channel */
for (i = schid; i < echid; i++) {
gchan = &gpii->gchan[i];
/* disable ch state so no more TRE processing */
write_lock_irq(&gpii->pm_lock);
gchan->pm_state = PREPARE_TERMINATE;
write_unlock_irq(&gpii->pm_lock);
/* send command to Stop the channel */
ret = gpi_stop_chan(gchan);
}
/* reset the channels (clears any pending tre) */
for (i = schid; i < echid; i++) {
gchan = &gpii->gchan[i];
ret = gpi_reset_chan(gchan, GPI_CH_CMD_RESET);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error resetting channel ret:%d\n", ret);
goto terminate_exit;
}
/* reprogram channel CNTXT */
ret = gpi_alloc_chan(gchan, false);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error alloc_channel ret:%d\n", ret);
goto terminate_exit;
}
}
/* restart the channels */
for (i = schid; i < echid; i++) {
gchan = &gpii->gchan[i];
ret = gpi_start_chan(gchan);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error Starting Channel ret:%d\n", ret);
goto terminate_exit;
}
}
terminate_exit:
mutex_unlock(&gpii->ctrl_lock);
return ret;
}
/* pause dma transfer for all channels */
static int gpi_pause(struct dma_chan *chan)
{
struct gchan *gchan = to_gchan(chan);
struct gpii *gpii = gchan->gpii;
int i, ret;
mutex_lock(&gpii->ctrl_lock);
/*
* pause/resume are per gpii not per channel, so
* client needs to call pause only once
*/
if (gpii->pm_state == PAUSE_STATE) {
dev_dbg(gpii->gpi_dev->dev, "channel is already paused\n");
mutex_unlock(&gpii->ctrl_lock);
return 0;
}
/* send stop command to stop the channels */
for (i = 0; i < MAX_CHANNELS_PER_GPII; i++) {
ret = gpi_stop_chan(&gpii->gchan[i]);
if (ret) {
mutex_unlock(&gpii->ctrl_lock);
return ret;
}
}
disable_irq(gpii->irq);
/* Wait for threads to complete out */
tasklet_kill(&gpii->ev_task);
write_lock_irq(&gpii->pm_lock);
gpii->pm_state = PAUSE_STATE;
write_unlock_irq(&gpii->pm_lock);
mutex_unlock(&gpii->ctrl_lock);
return 0;
}
/* resume dma transfer */
static int gpi_resume(struct dma_chan *chan)
{
struct gchan *gchan = to_gchan(chan);
struct gpii *gpii = gchan->gpii;
int i, ret;
mutex_lock(&gpii->ctrl_lock);
if (gpii->pm_state == ACTIVE_STATE) {
dev_dbg(gpii->gpi_dev->dev, "channel is already active\n");
mutex_unlock(&gpii->ctrl_lock);
return 0;
}
enable_irq(gpii->irq);
/* send start command to start the channels */
for (i = 0; i < MAX_CHANNELS_PER_GPII; i++) {
ret = gpi_send_cmd(gpii, &gpii->gchan[i], GPI_CH_CMD_START);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error starting chan, ret:%d\n", ret);
mutex_unlock(&gpii->ctrl_lock);
return ret;
}
}
write_lock_irq(&gpii->pm_lock);
gpii->pm_state = ACTIVE_STATE;
write_unlock_irq(&gpii->pm_lock);
mutex_unlock(&gpii->ctrl_lock);
return 0;
}
static void gpi_desc_free(struct virt_dma_desc *vd)
{
struct gpi_desc *gpi_desc = to_gpi_desc(vd);
kfree(gpi_desc);
gpi_desc = NULL;
}
static int
gpi_peripheral_config(struct dma_chan *chan, struct dma_slave_config *config)
{
struct gchan *gchan = to_gchan(chan);
if (!config->peripheral_config)
return -EINVAL;
gchan->config = krealloc(gchan->config, config->peripheral_size, GFP_NOWAIT);
if (!gchan->config)
return -ENOMEM;
memcpy(gchan->config, config->peripheral_config, config->peripheral_size);
return 0;
}
static int gpi_create_i2c_tre(struct gchan *chan, struct gpi_desc *desc,
struct scatterlist *sgl, enum dma_transfer_direction direction)
{
struct gpi_i2c_config *i2c = chan->config;
struct device *dev = chan->gpii->gpi_dev->dev;
unsigned int tre_idx = 0;
dma_addr_t address;
struct gpi_tre *tre;
unsigned int i;
/* first create config tre if applicable */
if (i2c->set_config) {
tre = &desc->tre[tre_idx];
tre_idx++;
tre->dword[0] = u32_encode_bits(i2c->low_count, TRE_I2C_C0_TLOW);
tre->dword[0] |= u32_encode_bits(i2c->high_count, TRE_I2C_C0_THIGH);
tre->dword[0] |= u32_encode_bits(i2c->cycle_count, TRE_I2C_C0_TCYL);
tre->dword[0] |= u32_encode_bits(i2c->pack_enable, TRE_I2C_C0_TX_PACK);
tre->dword[0] |= u32_encode_bits(i2c->pack_enable, TRE_I2C_C0_RX_PACK);
tre->dword[1] = 0;
tre->dword[2] = u32_encode_bits(i2c->clk_div, TRE_C0_CLK_DIV);
tre->dword[3] = u32_encode_bits(TRE_TYPE_CONFIG0, TRE_FLAGS_TYPE);
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
}
/* create the GO tre for Tx */
if (i2c->op == I2C_WRITE) {
tre = &desc->tre[tre_idx];
tre_idx++;
if (i2c->multi_msg)
tre->dword[0] = u32_encode_bits(I2C_READ, TRE_I2C_GO_CMD);
else
tre->dword[0] = u32_encode_bits(i2c->op, TRE_I2C_GO_CMD);
tre->dword[0] |= u32_encode_bits(i2c->addr, TRE_I2C_GO_ADDR);
tre->dword[0] |= u32_encode_bits(i2c->stretch, TRE_I2C_GO_STRETCH);
tre->dword[1] = 0;
tre->dword[2] = u32_encode_bits(i2c->rx_len, TRE_RX_LEN);
tre->dword[3] = u32_encode_bits(TRE_TYPE_GO, TRE_FLAGS_TYPE);
if (i2c->multi_msg)
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_LINK);
else
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
}
if (i2c->op == I2C_READ || i2c->multi_msg == false) {
/* create the DMA TRE */
tre = &desc->tre[tre_idx];
tre_idx++;
address = sg_dma_address(sgl);
tre->dword[0] = lower_32_bits(address);
tre->dword[1] = upper_32_bits(address);
tre->dword[2] = u32_encode_bits(sg_dma_len(sgl), TRE_DMA_LEN);
tre->dword[3] = u32_encode_bits(TRE_TYPE_DMA, TRE_FLAGS_TYPE);
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOT);
}
for (i = 0; i < tre_idx; i++)
dev_dbg(dev, "TRE:%d %x:%x:%x:%x\n", i, desc->tre[i].dword[0],
desc->tre[i].dword[1], desc->tre[i].dword[2], desc->tre[i].dword[3]);
return tre_idx;
}
static int gpi_create_spi_tre(struct gchan *chan, struct gpi_desc *desc,
struct scatterlist *sgl, enum dma_transfer_direction direction)
{
struct gpi_spi_config *spi = chan->config;
struct device *dev = chan->gpii->gpi_dev->dev;
unsigned int tre_idx = 0;
dma_addr_t address;
struct gpi_tre *tre;
unsigned int i;
/* first create config tre if applicable */
if (direction == DMA_MEM_TO_DEV && spi->set_config) {
tre = &desc->tre[tre_idx];
tre_idx++;
tre->dword[0] = u32_encode_bits(spi->word_len, TRE_SPI_C0_WORD_SZ);
tre->dword[0] |= u32_encode_bits(spi->loopback_en, TRE_SPI_C0_LOOPBACK);
tre->dword[0] |= u32_encode_bits(spi->clock_pol_high, TRE_SPI_C0_CPOL);
tre->dword[0] |= u32_encode_bits(spi->data_pol_high, TRE_SPI_C0_CPHA);
tre->dword[0] |= u32_encode_bits(spi->pack_en, TRE_SPI_C0_TX_PACK);
tre->dword[0] |= u32_encode_bits(spi->pack_en, TRE_SPI_C0_RX_PACK);
tre->dword[1] = 0;
tre->dword[2] = u32_encode_bits(spi->clk_div, TRE_C0_CLK_DIV);
tre->dword[2] |= u32_encode_bits(spi->clk_src, TRE_C0_CLK_SRC);
tre->dword[3] = u32_encode_bits(TRE_TYPE_CONFIG0, TRE_FLAGS_TYPE);
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
}
/* create the GO tre for Tx */
if (direction == DMA_MEM_TO_DEV) {
tre = &desc->tre[tre_idx];
tre_idx++;
tre->dword[0] = u32_encode_bits(spi->fragmentation, TRE_SPI_GO_FRAG);
tre->dword[0] |= u32_encode_bits(spi->cs, TRE_SPI_GO_CS);
tre->dword[0] |= u32_encode_bits(spi->cmd, TRE_SPI_GO_CMD);
tre->dword[1] = 0;
tre->dword[2] = u32_encode_bits(spi->rx_len, TRE_RX_LEN);
tre->dword[3] = u32_encode_bits(TRE_TYPE_GO, TRE_FLAGS_TYPE);
if (spi->cmd == SPI_RX) {
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOB);
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_LINK);
} else if (spi->cmd == SPI_TX) {
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
} else { /* SPI_DUPLEX */
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_CHAIN);
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_LINK);
}
}
/* create the dma tre */
tre = &desc->tre[tre_idx];
tre_idx++;
address = sg_dma_address(sgl);
tre->dword[0] = lower_32_bits(address);
tre->dword[1] = upper_32_bits(address);
tre->dword[2] = u32_encode_bits(sg_dma_len(sgl), TRE_DMA_LEN);
tre->dword[3] = u32_encode_bits(TRE_TYPE_DMA, TRE_FLAGS_TYPE);
if (direction == DMA_MEM_TO_DEV)
tre->dword[3] |= u32_encode_bits(1, TRE_FLAGS_IEOT);
for (i = 0; i < tre_idx; i++)
dev_dbg(dev, "TRE:%d %x:%x:%x:%x\n", i, desc->tre[i].dword[0],
desc->tre[i].dword[1], desc->tre[i].dword[2], desc->tre[i].dword[3]);
return tre_idx;
}
/* copy tre into transfer ring */
static struct dma_async_tx_descriptor *
gpi_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context)
{
struct gchan *gchan = to_gchan(chan);
struct gpii *gpii = gchan->gpii;
struct device *dev = gpii->gpi_dev->dev;
struct gpi_ring *ch_ring = &gchan->ch_ring;
struct gpi_desc *gpi_desc;
u32 nr, nr_tre = 0;
u8 set_config;
int i;
gpii->ieob_set = false;
if (!is_slave_direction(direction)) {
dev_err(gpii->gpi_dev->dev, "invalid dma direction: %d\n", direction);
return NULL;
}
if (sg_len > 1) {
dev_err(dev, "Multi sg sent, we support only one atm: %d\n", sg_len);
return NULL;
}
nr_tre = 3;
set_config = *(u32 *)gchan->config;
if (!set_config)
nr_tre = 2;
if (direction == DMA_DEV_TO_MEM) /* rx */
nr_tre = 1;
/* calculate # of elements required & available */
nr = gpi_ring_num_elements_avail(ch_ring);
if (nr < nr_tre) {
dev_err(dev, "not enough space in ring, avail:%u required:%u\n", nr, nr_tre);
return NULL;
}
gpi_desc = kzalloc(sizeof(*gpi_desc), GFP_NOWAIT);
if (!gpi_desc)
return NULL;
/* create TREs for xfer */
if (gchan->protocol == QCOM_GPI_SPI) {
i = gpi_create_spi_tre(gchan, gpi_desc, sgl, direction);
} else if (gchan->protocol == QCOM_GPI_I2C) {
i = gpi_create_i2c_tre(gchan, gpi_desc, sgl, direction);
} else {
dev_err(dev, "invalid peripheral: %d\n", gchan->protocol);
kfree(gpi_desc);
return NULL;
}
/* set up the descriptor */
gpi_desc->gchan = gchan;
gpi_desc->len = sg_dma_len(sgl);
gpi_desc->num_tre = i;
return vchan_tx_prep(&gchan->vc, &gpi_desc->vd, flags);
}
/* rings transfer ring db to being transfer */
static void gpi_issue_pending(struct dma_chan *chan)
{
struct gchan *gchan = to_gchan(chan);
struct gpii *gpii = gchan->gpii;
unsigned long flags, pm_lock_flags;
struct virt_dma_desc *vd = NULL;
struct gpi_desc *gpi_desc;
struct gpi_ring *ch_ring = &gchan->ch_ring;
void *tre, *wp = NULL;
int i;
read_lock_irqsave(&gpii->pm_lock, pm_lock_flags);
/* move all submitted discriptors to issued list */
spin_lock_irqsave(&gchan->vc.lock, flags);
if (vchan_issue_pending(&gchan->vc))
vd = list_last_entry(&gchan->vc.desc_issued,
struct virt_dma_desc, node);
spin_unlock_irqrestore(&gchan->vc.lock, flags);
/* nothing to do list is empty */
if (!vd) {
read_unlock_irqrestore(&gpii->pm_lock, pm_lock_flags);
return;
}
gpi_desc = to_gpi_desc(vd);
for (i = 0; i < gpi_desc->num_tre; i++) {
tre = &gpi_desc->tre[i];
gpi_queue_xfer(gpii, gchan, tre, &wp);
}
gpi_desc->db = ch_ring->wp;
gpi_write_ch_db(gchan, &gchan->ch_ring, gpi_desc->db);
read_unlock_irqrestore(&gpii->pm_lock, pm_lock_flags);
}
static int gpi_ch_init(struct gchan *gchan)
{
struct gpii *gpii = gchan->gpii;
const int ev_factor = gpii->gpi_dev->ev_factor;
u32 elements;
int i = 0, ret = 0;
gchan->pm_state = CONFIG_STATE;
/* check if both channels are configured before continue */
for (i = 0; i < MAX_CHANNELS_PER_GPII; i++)
if (gpii->gchan[i].pm_state != CONFIG_STATE)
goto exit_gpi_init;
/* protocol must be same for both channels */
if (gpii->gchan[0].protocol != gpii->gchan[1].protocol) {
dev_err(gpii->gpi_dev->dev, "protocol did not match protocol %u != %u\n",
gpii->gchan[0].protocol, gpii->gchan[1].protocol);
ret = -EINVAL;
goto exit_gpi_init;
}
/* allocate memory for event ring */
elements = CHAN_TRES << ev_factor;
ret = gpi_alloc_ring(&gpii->ev_ring, elements,
sizeof(union gpi_event), gpii);
if (ret)
goto exit_gpi_init;
/* configure interrupts */
write_lock_irq(&gpii->pm_lock);
gpii->pm_state = PREPARE_HARDWARE;
write_unlock_irq(&gpii->pm_lock);
ret = gpi_config_interrupts(gpii, DEFAULT_IRQ_SETTINGS, 0);
if (ret) {
dev_err(gpii->gpi_dev->dev, "error config. interrupts, ret:%d\n", ret);
goto error_config_int;
}
/* allocate event rings */
ret = gpi_alloc_ev_chan(gpii);
if (ret) {
dev_err(gpii->gpi_dev->dev, "error alloc_ev_chan:%d\n", ret);
goto error_alloc_ev_ring;
}
/* Allocate all channels */
for (i = 0; i < MAX_CHANNELS_PER_GPII; i++) {
ret = gpi_alloc_chan(&gpii->gchan[i], true);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error allocating chan:%d\n", ret);
goto error_alloc_chan;
}
}
/* start channels */
for (i = 0; i < MAX_CHANNELS_PER_GPII; i++) {
ret = gpi_start_chan(&gpii->gchan[i]);
if (ret) {
dev_err(gpii->gpi_dev->dev, "Error start chan:%d\n", ret);
goto error_start_chan;
}
}
return ret;
error_start_chan:
for (i = i - 1; i >= 0; i--) {
gpi_stop_chan(&gpii->gchan[i]);
gpi_send_cmd(gpii, gchan, GPI_CH_CMD_RESET);
}
i = 2;
error_alloc_chan:
for (i = i - 1; i >= 0; i--)
gpi_reset_chan(gchan, GPI_CH_CMD_DE_ALLOC);
error_alloc_ev_ring:
gpi_disable_interrupts(gpii);
error_config_int:
gpi_free_ring(&gpii->ev_ring, gpii);
exit_gpi_init:
return ret;
}
/* release all channel resources */
static void gpi_free_chan_resources(struct dma_chan *chan)
{
struct gchan *gchan = to_gchan(chan);
struct gpii *gpii = gchan->gpii;
enum gpi_pm_state cur_state;
int ret, i;
mutex_lock(&gpii->ctrl_lock);
cur_state = gchan->pm_state;
/* disable ch state so no more TRE processing for this channel */
write_lock_irq(&gpii->pm_lock);
gchan->pm_state = PREPARE_TERMINATE;
write_unlock_irq(&gpii->pm_lock);
/* attempt to do graceful hardware shutdown */
if (cur_state == ACTIVE_STATE) {
gpi_stop_chan(gchan);
ret = gpi_send_cmd(gpii, gchan, GPI_CH_CMD_RESET);
if (ret)
dev_err(gpii->gpi_dev->dev, "error resetting channel:%d\n", ret);
gpi_reset_chan(gchan, GPI_CH_CMD_DE_ALLOC);
}
/* free all allocated memory */
gpi_free_ring(&gchan->ch_ring, gpii);
vchan_free_chan_resources(&gchan->vc);
kfree(gchan->config);
write_lock_irq(&gpii->pm_lock);
gchan->pm_state = DISABLE_STATE;
write_unlock_irq(&gpii->pm_lock);
/* if other rings are still active exit */
for (i = 0; i < MAX_CHANNELS_PER_GPII; i++)
if (gpii->gchan[i].ch_ring.configured)
goto exit_free;
/* deallocate EV Ring */
cur_state = gpii->pm_state;
write_lock_irq(&gpii->pm_lock);
gpii->pm_state = PREPARE_TERMINATE;
write_unlock_irq(&gpii->pm_lock);
/* wait for threads to complete out */
tasklet_kill(&gpii->ev_task);
/* send command to de allocate event ring */
if (cur_state == ACTIVE_STATE)
gpi_send_cmd(gpii, NULL, GPI_EV_CMD_DEALLOC);
gpi_free_ring(&gpii->ev_ring, gpii);
/* disable interrupts */
if (cur_state == ACTIVE_STATE)
gpi_disable_interrupts(gpii);
/* set final state to disable */
write_lock_irq(&gpii->pm_lock);
gpii->pm_state = DISABLE_STATE;
write_unlock_irq(&gpii->pm_lock);
exit_free:
mutex_unlock(&gpii->ctrl_lock);
}
/* allocate channel resources */
static int gpi_alloc_chan_resources(struct dma_chan *chan)
{
struct gchan *gchan = to_gchan(chan);
struct gpii *gpii = gchan->gpii;
int ret;
mutex_lock(&gpii->ctrl_lock);
/* allocate memory for transfer ring */
ret = gpi_alloc_ring(&gchan->ch_ring, CHAN_TRES,
sizeof(struct gpi_tre), gpii);
if (ret)
goto xfer_alloc_err;
ret = gpi_ch_init(gchan);
mutex_unlock(&gpii->ctrl_lock);
return ret;
xfer_alloc_err:
mutex_unlock(&gpii->ctrl_lock);
return ret;
}
static int gpi_find_avail_gpii(struct gpi_dev *gpi_dev, u32 seid)
{
struct gchan *tx_chan, *rx_chan;
unsigned int gpii;
/* check if same seid is already configured for another chid */
for (gpii = 0; gpii < gpi_dev->max_gpii; gpii++) {
if (!((1 << gpii) & gpi_dev->gpii_mask))
continue;
tx_chan = &gpi_dev->gpiis[gpii].gchan[GPI_TX_CHAN];
rx_chan = &gpi_dev->gpiis[gpii].gchan[GPI_RX_CHAN];
if (rx_chan->vc.chan.client_count && rx_chan->seid == seid)
return gpii;
if (tx_chan->vc.chan.client_count && tx_chan->seid == seid)
return gpii;
}
/* no channels configured with same seid, return next avail gpii */
for (gpii = 0; gpii < gpi_dev->max_gpii; gpii++) {
if (!((1 << gpii) & gpi_dev->gpii_mask))
continue;
tx_chan = &gpi_dev->gpiis[gpii].gchan[GPI_TX_CHAN];
rx_chan = &gpi_dev->gpiis[gpii].gchan[GPI_RX_CHAN];
/* check if gpii is configured */
if (tx_chan->vc.chan.client_count ||
rx_chan->vc.chan.client_count)
continue;
/* found a free gpii */
return gpii;
}
/* no gpii instance available to use */
return -EIO;
}
/* gpi_of_dma_xlate: open client requested channel */
static struct dma_chan *gpi_of_dma_xlate(struct of_phandle_args *args,
struct of_dma *of_dma)
{
struct gpi_dev *gpi_dev = (struct gpi_dev *)of_dma->of_dma_data;
u32 seid, chid;
int gpii;
struct gchan *gchan;
if (args->args_count < 3) {
dev_err(gpi_dev->dev, "gpii require minimum 2 args, client passed:%d args\n",
args->args_count);
return NULL;
}
chid = args->args[0];
if (chid >= MAX_CHANNELS_PER_GPII) {
dev_err(gpi_dev->dev, "gpii channel:%d not valid\n", chid);
return NULL;
}
seid = args->args[1];
/* find next available gpii to use */
gpii = gpi_find_avail_gpii(gpi_dev, seid);
if (gpii < 0) {
dev_err(gpi_dev->dev, "no available gpii instances\n");
return NULL;
}
gchan = &gpi_dev->gpiis[gpii].gchan[chid];
if (gchan->vc.chan.client_count) {
dev_err(gpi_dev->dev, "gpii:%d chid:%d seid:%d already configured\n",
gpii, chid, gchan->seid);
return NULL;
}
gchan->seid = seid;
gchan->protocol = args->args[2];
return dma_get_slave_channel(&gchan->vc.chan);
}
static int gpi_probe(struct platform_device *pdev)
{
struct gpi_dev *gpi_dev;
unsigned int i;
u32 ee_offset;
int ret;
gpi_dev = devm_kzalloc(&pdev->dev, sizeof(*gpi_dev), GFP_KERNEL);
if (!gpi_dev)
return -ENOMEM;
gpi_dev->dev = &pdev->dev;
gpi_dev->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &gpi_dev->res);
if (IS_ERR(gpi_dev->regs))
return PTR_ERR(gpi_dev->regs);
gpi_dev->ee_base = gpi_dev->regs;
ret = of_property_read_u32(gpi_dev->dev->of_node, "dma-channels",
&gpi_dev->max_gpii);
if (ret) {
dev_err(gpi_dev->dev, "missing 'max-no-gpii' DT node\n");
return ret;
}
ret = of_property_read_u32(gpi_dev->dev->of_node, "dma-channel-mask",
&gpi_dev->gpii_mask);
if (ret) {
dev_err(gpi_dev->dev, "missing 'gpii-mask' DT node\n");
return ret;
}
ee_offset = (uintptr_t)device_get_match_data(gpi_dev->dev);
gpi_dev->ee_base = gpi_dev->ee_base - ee_offset;
gpi_dev->ev_factor = EV_FACTOR;
ret = dma_set_mask(gpi_dev->dev, DMA_BIT_MASK(64));
if (ret) {
dev_err(gpi_dev->dev, "Error setting dma_mask to 64, ret:%d\n", ret);
return ret;
}
gpi_dev->gpiis = devm_kzalloc(gpi_dev->dev, sizeof(*gpi_dev->gpiis) *
gpi_dev->max_gpii, GFP_KERNEL);
if (!gpi_dev->gpiis)
return -ENOMEM;
/* setup all the supported gpii */
INIT_LIST_HEAD(&gpi_dev->dma_device.channels);
for (i = 0; i < gpi_dev->max_gpii; i++) {
struct gpii *gpii = &gpi_dev->gpiis[i];
int chan;
if (!((1 << i) & gpi_dev->gpii_mask))
continue;
/* set up ev cntxt register map */
gpii->ev_cntxt_base_reg = gpi_dev->ee_base + GPII_n_EV_CH_k_CNTXT_0_OFFS(i, 0);
gpii->ev_cntxt_db_reg = gpi_dev->ee_base + GPII_n_EV_CH_k_DOORBELL_0_OFFS(i, 0);
gpii->ev_ring_rp_lsb_reg = gpii->ev_cntxt_base_reg + CNTXT_4_RING_RP_LSB;
gpii->ev_cmd_reg = gpi_dev->ee_base + GPII_n_EV_CH_CMD_OFFS(i);
gpii->ieob_clr_reg = gpi_dev->ee_base + GPII_n_CNTXT_SRC_IEOB_IRQ_CLR_OFFS(i);
/* set up irq */
ret = platform_get_irq(pdev, i);
if (ret < 0)
return ret;
gpii->irq = ret;
/* set up channel specific register info */
for (chan = 0; chan < MAX_CHANNELS_PER_GPII; chan++) {
struct gchan *gchan = &gpii->gchan[chan];
/* set up ch cntxt register map */
gchan->ch_cntxt_base_reg = gpi_dev->ee_base +
GPII_n_CH_k_CNTXT_0_OFFS(i, chan);
gchan->ch_cntxt_db_reg = gpi_dev->ee_base +
GPII_n_CH_k_DOORBELL_0_OFFS(i, chan);
gchan->ch_cmd_reg = gpi_dev->ee_base + GPII_n_CH_CMD_OFFS(i);
/* vchan setup */
vchan_init(&gchan->vc, &gpi_dev->dma_device);
gchan->vc.desc_free = gpi_desc_free;
gchan->chid = chan;
gchan->gpii = gpii;
gchan->dir = GPII_CHAN_DIR[chan];
}
mutex_init(&gpii->ctrl_lock);
rwlock_init(&gpii->pm_lock);
tasklet_init(&gpii->ev_task, gpi_ev_tasklet,
(unsigned long)gpii);
init_completion(&gpii->cmd_completion);
gpii->gpii_id = i;
gpii->regs = gpi_dev->ee_base;
gpii->gpi_dev = gpi_dev;
}
platform_set_drvdata(pdev, gpi_dev);
/* clear and Set capabilities */
dma_cap_zero(gpi_dev->dma_device.cap_mask);
dma_cap_set(DMA_SLAVE, gpi_dev->dma_device.cap_mask);
/* configure dmaengine apis */
gpi_dev->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
gpi_dev->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
gpi_dev->dma_device.src_addr_widths = DMA_SLAVE_BUSWIDTH_8_BYTES;
gpi_dev->dma_device.dst_addr_widths = DMA_SLAVE_BUSWIDTH_8_BYTES;
gpi_dev->dma_device.device_alloc_chan_resources = gpi_alloc_chan_resources;
gpi_dev->dma_device.device_free_chan_resources = gpi_free_chan_resources;
gpi_dev->dma_device.device_tx_status = dma_cookie_status;
gpi_dev->dma_device.device_issue_pending = gpi_issue_pending;
gpi_dev->dma_device.device_prep_slave_sg = gpi_prep_slave_sg;
gpi_dev->dma_device.device_config = gpi_peripheral_config;
gpi_dev->dma_device.device_terminate_all = gpi_terminate_all;
gpi_dev->dma_device.dev = gpi_dev->dev;
gpi_dev->dma_device.device_pause = gpi_pause;
gpi_dev->dma_device.device_resume = gpi_resume;
/* register with dmaengine framework */
ret = dma_async_device_register(&gpi_dev->dma_device);
if (ret) {
dev_err(gpi_dev->dev, "async_device_register failed ret:%d", ret);
return ret;
}
ret = of_dma_controller_register(gpi_dev->dev->of_node,
gpi_of_dma_xlate, gpi_dev);
if (ret) {
dev_err(gpi_dev->dev, "of_dma_controller_reg failed ret:%d", ret);
return ret;
}
return ret;
}
static const struct of_device_id gpi_of_match[] = {
{ .compatible = "qcom,sdm845-gpi-dma", .data = (void *)0x0 },
{ .compatible = "qcom,sm6350-gpi-dma", .data = (void *)0x10000 },
/*
* Do not grow the list for compatible devices. Instead use
* qcom,sdm845-gpi-dma (for ee_offset = 0x0) or qcom,sm6350-gpi-dma
* (for ee_offset = 0x10000).
*/
{ .compatible = "qcom,sc7280-gpi-dma", .data = (void *)0x10000 },
{ .compatible = "qcom,sm8150-gpi-dma", .data = (void *)0x0 },
{ .compatible = "qcom,sm8250-gpi-dma", .data = (void *)0x0 },
{ .compatible = "qcom,sm8350-gpi-dma", .data = (void *)0x10000 },
{ .compatible = "qcom,sm8450-gpi-dma", .data = (void *)0x10000 },
{ },
};
MODULE_DEVICE_TABLE(of, gpi_of_match);
static struct platform_driver gpi_driver = {
.probe = gpi_probe,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = gpi_of_match,
},
};
static int __init gpi_init(void)
{
return platform_driver_register(&gpi_driver);
}
subsys_initcall(gpi_init)
MODULE_DESCRIPTION("QCOM GPI DMA engine driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/qcom/gpi.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dma/qcom_adm.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include "../dmaengine.h"
#include "../virt-dma.h"
/* ADM registers - calculated from channel number and security domain */
#define ADM_CHAN_MULTI 0x4
#define ADM_CI_MULTI 0x4
#define ADM_CRCI_MULTI 0x4
#define ADM_EE_MULTI 0x800
#define ADM_CHAN_OFFS(chan) (ADM_CHAN_MULTI * (chan))
#define ADM_EE_OFFS(ee) (ADM_EE_MULTI * (ee))
#define ADM_CHAN_EE_OFFS(chan, ee) (ADM_CHAN_OFFS(chan) + ADM_EE_OFFS(ee))
#define ADM_CHAN_OFFS(chan) (ADM_CHAN_MULTI * (chan))
#define ADM_CI_OFFS(ci) (ADM_CHAN_OFF(ci))
#define ADM_CH_CMD_PTR(chan, ee) (ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_CH_RSLT(chan, ee) (0x40 + ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_CH_FLUSH_STATE0(chan, ee) (0x80 + ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_CH_STATUS_SD(chan, ee) (0x200 + ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_CH_CONF(chan) (0x240 + ADM_CHAN_OFFS(chan))
#define ADM_CH_RSLT_CONF(chan, ee) (0x300 + ADM_CHAN_EE_OFFS(chan, ee))
#define ADM_SEC_DOMAIN_IRQ_STATUS(ee) (0x380 + ADM_EE_OFFS(ee))
#define ADM_CI_CONF(ci) (0x390 + (ci) * ADM_CI_MULTI)
#define ADM_GP_CTL 0x3d8
#define ADM_CRCI_CTL(crci, ee) (0x400 + (crci) * ADM_CRCI_MULTI + \
ADM_EE_OFFS(ee))
/* channel status */
#define ADM_CH_STATUS_VALID BIT(1)
/* channel result */
#define ADM_CH_RSLT_VALID BIT(31)
#define ADM_CH_RSLT_ERR BIT(3)
#define ADM_CH_RSLT_FLUSH BIT(2)
#define ADM_CH_RSLT_TPD BIT(1)
/* channel conf */
#define ADM_CH_CONF_SHADOW_EN BIT(12)
#define ADM_CH_CONF_MPU_DISABLE BIT(11)
#define ADM_CH_CONF_PERM_MPU_CONF BIT(9)
#define ADM_CH_CONF_FORCE_RSLT_EN BIT(7)
#define ADM_CH_CONF_SEC_DOMAIN(ee) ((((ee) & 0x3) << 4) | (((ee) & 0x4) << 11))
/* channel result conf */
#define ADM_CH_RSLT_CONF_FLUSH_EN BIT(1)
#define ADM_CH_RSLT_CONF_IRQ_EN BIT(0)
/* CRCI CTL */
#define ADM_CRCI_CTL_MUX_SEL BIT(18)
#define ADM_CRCI_CTL_RST BIT(17)
/* CI configuration */
#define ADM_CI_RANGE_END(x) ((x) << 24)
#define ADM_CI_RANGE_START(x) ((x) << 16)
#define ADM_CI_BURST_4_WORDS BIT(2)
#define ADM_CI_BURST_8_WORDS BIT(3)
/* GP CTL */
#define ADM_GP_CTL_LP_EN BIT(12)
#define ADM_GP_CTL_LP_CNT(x) ((x) << 8)
/* Command pointer list entry */
#define ADM_CPLE_LP BIT(31)
#define ADM_CPLE_CMD_PTR_LIST BIT(29)
/* Command list entry */
#define ADM_CMD_LC BIT(31)
#define ADM_CMD_DST_CRCI(n) (((n) & 0xf) << 7)
#define ADM_CMD_SRC_CRCI(n) (((n) & 0xf) << 3)
#define ADM_CMD_TYPE_SINGLE 0x0
#define ADM_CMD_TYPE_BOX 0x3
#define ADM_CRCI_MUX_SEL BIT(4)
#define ADM_DESC_ALIGN 8
#define ADM_MAX_XFER (SZ_64K - 1)
#define ADM_MAX_ROWS (SZ_64K - 1)
#define ADM_MAX_CHANNELS 16
struct adm_desc_hw_box {
u32 cmd;
u32 src_addr;
u32 dst_addr;
u32 row_len;
u32 num_rows;
u32 row_offset;
};
struct adm_desc_hw_single {
u32 cmd;
u32 src_addr;
u32 dst_addr;
u32 len;
};
struct adm_async_desc {
struct virt_dma_desc vd;
struct adm_device *adev;
size_t length;
enum dma_transfer_direction dir;
dma_addr_t dma_addr;
size_t dma_len;
void *cpl;
dma_addr_t cp_addr;
u32 crci;
u32 mux;
u32 blk_size;
};
struct adm_chan {
struct virt_dma_chan vc;
struct adm_device *adev;
/* parsed from DT */
u32 id; /* channel id */
struct adm_async_desc *curr_txd;
struct dma_slave_config slave;
u32 crci;
u32 mux;
struct list_head node;
int error;
int initialized;
};
static inline struct adm_chan *to_adm_chan(struct dma_chan *common)
{
return container_of(common, struct adm_chan, vc.chan);
}
struct adm_device {
void __iomem *regs;
struct device *dev;
struct dma_device common;
struct device_dma_parameters dma_parms;
struct adm_chan *channels;
u32 ee;
struct clk *core_clk;
struct clk *iface_clk;
struct reset_control *clk_reset;
struct reset_control *c0_reset;
struct reset_control *c1_reset;
struct reset_control *c2_reset;
int irq;
};
/**
* adm_free_chan - Frees dma resources associated with the specific channel
*
* @chan: dma channel
*
* Free all allocated descriptors associated with this channel
*/
static void adm_free_chan(struct dma_chan *chan)
{
/* free all queued descriptors */
vchan_free_chan_resources(to_virt_chan(chan));
}
/**
* adm_get_blksize - Get block size from burst value
*
* @burst: Burst size of transaction
*/
static int adm_get_blksize(unsigned int burst)
{
int ret;
switch (burst) {
case 16:
case 32:
case 64:
case 128:
ret = ffs(burst >> 4) - 1;
break;
case 192:
ret = 4;
break;
case 256:
ret = 5;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
/**
* adm_process_fc_descriptors - Process descriptors for flow controlled xfers
*
* @achan: ADM channel
* @desc: Descriptor memory pointer
* @sg: Scatterlist entry
* @crci: CRCI value
* @burst: Burst size of transaction
* @direction: DMA transfer direction
*/
static void *adm_process_fc_descriptors(struct adm_chan *achan, void *desc,
struct scatterlist *sg, u32 crci,
u32 burst,
enum dma_transfer_direction direction)
{
struct adm_desc_hw_box *box_desc = NULL;
struct adm_desc_hw_single *single_desc;
u32 remainder = sg_dma_len(sg);
u32 rows, row_offset, crci_cmd;
u32 mem_addr = sg_dma_address(sg);
u32 *incr_addr = &mem_addr;
u32 *src, *dst;
if (direction == DMA_DEV_TO_MEM) {
crci_cmd = ADM_CMD_SRC_CRCI(crci);
row_offset = burst;
src = &achan->slave.src_addr;
dst = &mem_addr;
} else {
crci_cmd = ADM_CMD_DST_CRCI(crci);
row_offset = burst << 16;
src = &mem_addr;
dst = &achan->slave.dst_addr;
}
while (remainder >= burst) {
box_desc = desc;
box_desc->cmd = ADM_CMD_TYPE_BOX | crci_cmd;
box_desc->row_offset = row_offset;
box_desc->src_addr = *src;
box_desc->dst_addr = *dst;
rows = remainder / burst;
rows = min_t(u32, rows, ADM_MAX_ROWS);
box_desc->num_rows = rows << 16 | rows;
box_desc->row_len = burst << 16 | burst;
*incr_addr += burst * rows;
remainder -= burst * rows;
desc += sizeof(*box_desc);
}
/* if leftover bytes, do one single descriptor */
if (remainder) {
single_desc = desc;
single_desc->cmd = ADM_CMD_TYPE_SINGLE | crci_cmd;
single_desc->len = remainder;
single_desc->src_addr = *src;
single_desc->dst_addr = *dst;
desc += sizeof(*single_desc);
if (sg_is_last(sg))
single_desc->cmd |= ADM_CMD_LC;
} else {
if (box_desc && sg_is_last(sg))
box_desc->cmd |= ADM_CMD_LC;
}
return desc;
}
/**
* adm_process_non_fc_descriptors - Process descriptors for non-fc xfers
*
* @achan: ADM channel
* @desc: Descriptor memory pointer
* @sg: Scatterlist entry
* @direction: DMA transfer direction
*/
static void *adm_process_non_fc_descriptors(struct adm_chan *achan, void *desc,
struct scatterlist *sg,
enum dma_transfer_direction direction)
{
struct adm_desc_hw_single *single_desc;
u32 remainder = sg_dma_len(sg);
u32 mem_addr = sg_dma_address(sg);
u32 *incr_addr = &mem_addr;
u32 *src, *dst;
if (direction == DMA_DEV_TO_MEM) {
src = &achan->slave.src_addr;
dst = &mem_addr;
} else {
src = &mem_addr;
dst = &achan->slave.dst_addr;
}
do {
single_desc = desc;
single_desc->cmd = ADM_CMD_TYPE_SINGLE;
single_desc->src_addr = *src;
single_desc->dst_addr = *dst;
single_desc->len = (remainder > ADM_MAX_XFER) ?
ADM_MAX_XFER : remainder;
remainder -= single_desc->len;
*incr_addr += single_desc->len;
desc += sizeof(*single_desc);
} while (remainder);
/* set last command if this is the end of the whole transaction */
if (sg_is_last(sg))
single_desc->cmd |= ADM_CMD_LC;
return desc;
}
/**
* adm_prep_slave_sg - Prep slave sg transaction
*
* @chan: dma channel
* @sgl: scatter gather list
* @sg_len: length of sg
* @direction: DMA transfer direction
* @flags: DMA flags
* @context: transfer context (unused)
*/
static struct dma_async_tx_descriptor *adm_prep_slave_sg(struct dma_chan *chan,
struct scatterlist *sgl,
unsigned int sg_len,
enum dma_transfer_direction direction,
unsigned long flags,
void *context)
{
struct adm_chan *achan = to_adm_chan(chan);
struct adm_device *adev = achan->adev;
struct adm_async_desc *async_desc;
struct scatterlist *sg;
dma_addr_t cple_addr;
u32 i, burst;
u32 single_count = 0, box_count = 0, crci = 0;
void *desc;
u32 *cple;
int blk_size = 0;
if (!is_slave_direction(direction)) {
dev_err(adev->dev, "invalid dma direction\n");
return NULL;
}
/*
* get burst value from slave configuration
*/
burst = (direction == DMA_MEM_TO_DEV) ?
achan->slave.dst_maxburst :
achan->slave.src_maxburst;
/* if using flow control, validate burst and crci values */
if (achan->slave.device_fc) {
blk_size = adm_get_blksize(burst);
if (blk_size < 0) {
dev_err(adev->dev, "invalid burst value: %d\n",
burst);
return NULL;
}
crci = achan->crci & 0xf;
if (!crci || achan->crci > 0x1f) {
dev_err(adev->dev, "invalid crci value\n");
return NULL;
}
}
/* iterate through sgs and compute allocation size of structures */
for_each_sg(sgl, sg, sg_len, i) {
if (achan->slave.device_fc) {
box_count += DIV_ROUND_UP(sg_dma_len(sg) / burst,
ADM_MAX_ROWS);
if (sg_dma_len(sg) % burst)
single_count++;
} else {
single_count += DIV_ROUND_UP(sg_dma_len(sg),
ADM_MAX_XFER);
}
}
async_desc = kzalloc(sizeof(*async_desc), GFP_NOWAIT);
if (!async_desc) {
dev_err(adev->dev, "not enough memory for async_desc struct\n");
return NULL;
}
async_desc->mux = achan->mux ? ADM_CRCI_CTL_MUX_SEL : 0;
async_desc->crci = crci;
async_desc->blk_size = blk_size;
async_desc->dma_len = single_count * sizeof(struct adm_desc_hw_single) +
box_count * sizeof(struct adm_desc_hw_box) +
sizeof(*cple) + 2 * ADM_DESC_ALIGN;
async_desc->cpl = kzalloc(async_desc->dma_len, GFP_NOWAIT);
if (!async_desc->cpl) {
dev_err(adev->dev, "not enough memory for cpl struct\n");
goto free;
}
async_desc->adev = adev;
/* both command list entry and descriptors must be 8 byte aligned */
cple = PTR_ALIGN(async_desc->cpl, ADM_DESC_ALIGN);
desc = PTR_ALIGN(cple + 1, ADM_DESC_ALIGN);
for_each_sg(sgl, sg, sg_len, i) {
async_desc->length += sg_dma_len(sg);
if (achan->slave.device_fc)
desc = adm_process_fc_descriptors(achan, desc, sg, crci,
burst, direction);
else
desc = adm_process_non_fc_descriptors(achan, desc, sg,
direction);
}
async_desc->dma_addr = dma_map_single(adev->dev, async_desc->cpl,
async_desc->dma_len,
DMA_TO_DEVICE);
if (dma_mapping_error(adev->dev, async_desc->dma_addr)) {
dev_err(adev->dev, "dma mapping error for cpl\n");
goto free;
}
cple_addr = async_desc->dma_addr + ((void *)cple - async_desc->cpl);
/* init cmd list */
dma_sync_single_for_cpu(adev->dev, cple_addr, sizeof(*cple),
DMA_TO_DEVICE);
*cple = ADM_CPLE_LP;
*cple |= (async_desc->dma_addr + ADM_DESC_ALIGN) >> 3;
dma_sync_single_for_device(adev->dev, cple_addr, sizeof(*cple),
DMA_TO_DEVICE);
return vchan_tx_prep(&achan->vc, &async_desc->vd, flags);
free:
kfree(async_desc);
return NULL;
}
/**
* adm_terminate_all - terminate all transactions on a channel
* @chan: dma channel
*
* Dequeues and frees all transactions, aborts current transaction
* No callbacks are done
*
*/
static int adm_terminate_all(struct dma_chan *chan)
{
struct adm_chan *achan = to_adm_chan(chan);
struct adm_device *adev = achan->adev;
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&achan->vc.lock, flags);
vchan_get_all_descriptors(&achan->vc, &head);
/* send flush command to terminate current transaction */
writel_relaxed(0x0,
adev->regs + ADM_CH_FLUSH_STATE0(achan->id, adev->ee));
spin_unlock_irqrestore(&achan->vc.lock, flags);
vchan_dma_desc_free_list(&achan->vc, &head);
return 0;
}
static int adm_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
{
struct adm_chan *achan = to_adm_chan(chan);
struct qcom_adm_peripheral_config *config = cfg->peripheral_config;
unsigned long flag;
spin_lock_irqsave(&achan->vc.lock, flag);
memcpy(&achan->slave, cfg, sizeof(struct dma_slave_config));
if (cfg->peripheral_size == sizeof(*config))
achan->crci = config->crci;
spin_unlock_irqrestore(&achan->vc.lock, flag);
return 0;
}
/**
* adm_start_dma - start next transaction
* @achan: ADM dma channel
*/
static void adm_start_dma(struct adm_chan *achan)
{
struct virt_dma_desc *vd = vchan_next_desc(&achan->vc);
struct adm_device *adev = achan->adev;
struct adm_async_desc *async_desc;
lockdep_assert_held(&achan->vc.lock);
if (!vd)
return;
list_del(&vd->node);
/* write next command list out to the CMD FIFO */
async_desc = container_of(vd, struct adm_async_desc, vd);
achan->curr_txd = async_desc;
/* reset channel error */
achan->error = 0;
if (!achan->initialized) {
/* enable interrupts */
writel(ADM_CH_CONF_SHADOW_EN |
ADM_CH_CONF_PERM_MPU_CONF |
ADM_CH_CONF_MPU_DISABLE |
ADM_CH_CONF_SEC_DOMAIN(adev->ee),
adev->regs + ADM_CH_CONF(achan->id));
writel(ADM_CH_RSLT_CONF_IRQ_EN | ADM_CH_RSLT_CONF_FLUSH_EN,
adev->regs + ADM_CH_RSLT_CONF(achan->id, adev->ee));
achan->initialized = 1;
}
/* set the crci block size if this transaction requires CRCI */
if (async_desc->crci) {
writel(async_desc->mux | async_desc->blk_size,
adev->regs + ADM_CRCI_CTL(async_desc->crci, adev->ee));
}
/* make sure IRQ enable doesn't get reordered */
wmb();
/* write next command list out to the CMD FIFO */
writel(ALIGN(async_desc->dma_addr, ADM_DESC_ALIGN) >> 3,
adev->regs + ADM_CH_CMD_PTR(achan->id, adev->ee));
}
/**
* adm_dma_irq - irq handler for ADM controller
* @irq: IRQ of interrupt
* @data: callback data
*
* IRQ handler for the bam controller
*/
static irqreturn_t adm_dma_irq(int irq, void *data)
{
struct adm_device *adev = data;
u32 srcs, i;
struct adm_async_desc *async_desc;
unsigned long flags;
srcs = readl_relaxed(adev->regs +
ADM_SEC_DOMAIN_IRQ_STATUS(adev->ee));
for (i = 0; i < ADM_MAX_CHANNELS; i++) {
struct adm_chan *achan = &adev->channels[i];
u32 status, result;
if (srcs & BIT(i)) {
status = readl_relaxed(adev->regs +
ADM_CH_STATUS_SD(i, adev->ee));
/* if no result present, skip */
if (!(status & ADM_CH_STATUS_VALID))
continue;
result = readl_relaxed(adev->regs +
ADM_CH_RSLT(i, adev->ee));
/* no valid results, skip */
if (!(result & ADM_CH_RSLT_VALID))
continue;
/* flag error if transaction was flushed or failed */
if (result & (ADM_CH_RSLT_ERR | ADM_CH_RSLT_FLUSH))
achan->error = 1;
spin_lock_irqsave(&achan->vc.lock, flags);
async_desc = achan->curr_txd;
achan->curr_txd = NULL;
if (async_desc) {
vchan_cookie_complete(&async_desc->vd);
/* kick off next DMA */
adm_start_dma(achan);
}
spin_unlock_irqrestore(&achan->vc.lock, flags);
}
}
return IRQ_HANDLED;
}
/**
* adm_tx_status - returns status of transaction
* @chan: dma channel
* @cookie: transaction cookie
* @txstate: DMA transaction state
*
* Return status of dma transaction
*/
static enum dma_status adm_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct adm_chan *achan = to_adm_chan(chan);
struct virt_dma_desc *vd;
enum dma_status ret;
unsigned long flags;
size_t residue = 0;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&achan->vc.lock, flags);
vd = vchan_find_desc(&achan->vc, cookie);
if (vd)
residue = container_of(vd, struct adm_async_desc, vd)->length;
spin_unlock_irqrestore(&achan->vc.lock, flags);
/*
* residue is either the full length if it is in the issued list, or 0
* if it is in progress. We have no reliable way of determining
* anything inbetween
*/
dma_set_residue(txstate, residue);
if (achan->error)
return DMA_ERROR;
return ret;
}
/**
* adm_issue_pending - starts pending transactions
* @chan: dma channel
*
* Issues all pending transactions and starts DMA
*/
static void adm_issue_pending(struct dma_chan *chan)
{
struct adm_chan *achan = to_adm_chan(chan);
unsigned long flags;
spin_lock_irqsave(&achan->vc.lock, flags);
if (vchan_issue_pending(&achan->vc) && !achan->curr_txd)
adm_start_dma(achan);
spin_unlock_irqrestore(&achan->vc.lock, flags);
}
/**
* adm_dma_free_desc - free descriptor memory
* @vd: virtual descriptor
*
*/
static void adm_dma_free_desc(struct virt_dma_desc *vd)
{
struct adm_async_desc *async_desc = container_of(vd,
struct adm_async_desc, vd);
dma_unmap_single(async_desc->adev->dev, async_desc->dma_addr,
async_desc->dma_len, DMA_TO_DEVICE);
kfree(async_desc->cpl);
kfree(async_desc);
}
static void adm_channel_init(struct adm_device *adev, struct adm_chan *achan,
u32 index)
{
achan->id = index;
achan->adev = adev;
vchan_init(&achan->vc, &adev->common);
achan->vc.desc_free = adm_dma_free_desc;
}
/**
* adm_dma_xlate
* @dma_spec: pointer to DMA specifier as found in the device tree
* @ofdma: pointer to DMA controller data
*
* This can use either 1-cell or 2-cell formats, the first cell
* identifies the slave device, while the optional second cell
* contains the crci value.
*
* Returns pointer to appropriate dma channel on success or NULL on error.
*/
static struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct dma_device *dev = ofdma->of_dma_data;
struct dma_chan *chan, *candidate = NULL;
struct adm_chan *achan;
if (!dev || dma_spec->args_count > 2)
return NULL;
list_for_each_entry(chan, &dev->channels, device_node)
if (chan->chan_id == dma_spec->args[0]) {
candidate = chan;
break;
}
if (!candidate)
return NULL;
achan = to_adm_chan(candidate);
if (dma_spec->args_count == 2)
achan->crci = dma_spec->args[1];
else
achan->crci = 0;
return dma_get_slave_channel(candidate);
}
static int adm_dma_probe(struct platform_device *pdev)
{
struct adm_device *adev;
int ret;
u32 i;
adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL);
if (!adev)
return -ENOMEM;
adev->dev = &pdev->dev;
adev->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(adev->regs))
return PTR_ERR(adev->regs);
adev->irq = platform_get_irq(pdev, 0);
if (adev->irq < 0)
return adev->irq;
ret = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &adev->ee);
if (ret) {
dev_err(adev->dev, "Execution environment unspecified\n");
return ret;
}
adev->core_clk = devm_clk_get(adev->dev, "core");
if (IS_ERR(adev->core_clk))
return PTR_ERR(adev->core_clk);
adev->iface_clk = devm_clk_get(adev->dev, "iface");
if (IS_ERR(adev->iface_clk))
return PTR_ERR(adev->iface_clk);
adev->clk_reset = devm_reset_control_get_exclusive(&pdev->dev, "clk");
if (IS_ERR(adev->clk_reset)) {
dev_err(adev->dev, "failed to get ADM0 reset\n");
return PTR_ERR(adev->clk_reset);
}
adev->c0_reset = devm_reset_control_get_exclusive(&pdev->dev, "c0");
if (IS_ERR(adev->c0_reset)) {
dev_err(adev->dev, "failed to get ADM0 C0 reset\n");
return PTR_ERR(adev->c0_reset);
}
adev->c1_reset = devm_reset_control_get_exclusive(&pdev->dev, "c1");
if (IS_ERR(adev->c1_reset)) {
dev_err(adev->dev, "failed to get ADM0 C1 reset\n");
return PTR_ERR(adev->c1_reset);
}
adev->c2_reset = devm_reset_control_get_exclusive(&pdev->dev, "c2");
if (IS_ERR(adev->c2_reset)) {
dev_err(adev->dev, "failed to get ADM0 C2 reset\n");
return PTR_ERR(adev->c2_reset);
}
ret = clk_prepare_enable(adev->core_clk);
if (ret) {
dev_err(adev->dev, "failed to prepare/enable core clock\n");
return ret;
}
ret = clk_prepare_enable(adev->iface_clk);
if (ret) {
dev_err(adev->dev, "failed to prepare/enable iface clock\n");
goto err_disable_core_clk;
}
reset_control_assert(adev->clk_reset);
reset_control_assert(adev->c0_reset);
reset_control_assert(adev->c1_reset);
reset_control_assert(adev->c2_reset);
udelay(2);
reset_control_deassert(adev->clk_reset);
reset_control_deassert(adev->c0_reset);
reset_control_deassert(adev->c1_reset);
reset_control_deassert(adev->c2_reset);
adev->channels = devm_kcalloc(adev->dev, ADM_MAX_CHANNELS,
sizeof(*adev->channels), GFP_KERNEL);
if (!adev->channels) {
ret = -ENOMEM;
goto err_disable_clks;
}
/* allocate and initialize channels */
INIT_LIST_HEAD(&adev->common.channels);
for (i = 0; i < ADM_MAX_CHANNELS; i++)
adm_channel_init(adev, &adev->channels[i], i);
/* reset CRCIs */
for (i = 0; i < 16; i++)
writel(ADM_CRCI_CTL_RST, adev->regs +
ADM_CRCI_CTL(i, adev->ee));
/* configure client interfaces */
writel(ADM_CI_RANGE_START(0x40) | ADM_CI_RANGE_END(0xb0) |
ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(0));
writel(ADM_CI_RANGE_START(0x2a) | ADM_CI_RANGE_END(0x2c) |
ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(1));
writel(ADM_CI_RANGE_START(0x12) | ADM_CI_RANGE_END(0x28) |
ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(2));
writel(ADM_GP_CTL_LP_EN | ADM_GP_CTL_LP_CNT(0xf),
adev->regs + ADM_GP_CTL);
ret = devm_request_irq(adev->dev, adev->irq, adm_dma_irq,
0, "adm_dma", adev);
if (ret)
goto err_disable_clks;
platform_set_drvdata(pdev, adev);
adev->common.dev = adev->dev;
adev->common.dev->dma_parms = &adev->dma_parms;
/* set capabilities */
dma_cap_zero(adev->common.cap_mask);
dma_cap_set(DMA_SLAVE, adev->common.cap_mask);
dma_cap_set(DMA_PRIVATE, adev->common.cap_mask);
/* initialize dmaengine apis */
adev->common.directions = BIT(DMA_DEV_TO_MEM | DMA_MEM_TO_DEV);
adev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
adev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
adev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
adev->common.device_free_chan_resources = adm_free_chan;
adev->common.device_prep_slave_sg = adm_prep_slave_sg;
adev->common.device_issue_pending = adm_issue_pending;
adev->common.device_tx_status = adm_tx_status;
adev->common.device_terminate_all = adm_terminate_all;
adev->common.device_config = adm_slave_config;
ret = dma_async_device_register(&adev->common);
if (ret) {
dev_err(adev->dev, "failed to register dma async device\n");
goto err_disable_clks;
}
ret = of_dma_controller_register(pdev->dev.of_node, adm_dma_xlate,
&adev->common);
if (ret)
goto err_unregister_dma;
return 0;
err_unregister_dma:
dma_async_device_unregister(&adev->common);
err_disable_clks:
clk_disable_unprepare(adev->iface_clk);
err_disable_core_clk:
clk_disable_unprepare(adev->core_clk);
return ret;
}
static int adm_dma_remove(struct platform_device *pdev)
{
struct adm_device *adev = platform_get_drvdata(pdev);
struct adm_chan *achan;
u32 i;
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&adev->common);
for (i = 0; i < ADM_MAX_CHANNELS; i++) {
achan = &adev->channels[i];
/* mask IRQs for this channel/EE pair */
writel(0, adev->regs + ADM_CH_RSLT_CONF(achan->id, adev->ee));
tasklet_kill(&adev->channels[i].vc.task);
adm_terminate_all(&adev->channels[i].vc.chan);
}
devm_free_irq(adev->dev, adev->irq, adev);
clk_disable_unprepare(adev->core_clk);
clk_disable_unprepare(adev->iface_clk);
return 0;
}
static const struct of_device_id adm_of_match[] = {
{ .compatible = "qcom,adm", },
{}
};
MODULE_DEVICE_TABLE(of, adm_of_match);
static struct platform_driver adm_dma_driver = {
.probe = adm_dma_probe,
.remove = adm_dma_remove,
.driver = {
.name = "adm-dma-engine",
.of_match_table = adm_of_match,
},
};
module_platform_driver(adm_dma_driver);
MODULE_AUTHOR("Andy Gross <[email protected]>");
MODULE_DESCRIPTION("QCOM ADM DMA engine driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/qcom/qcom_adm.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Qualcomm Technologies HIDMA DMA engine Management interface
*
* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
*/
#include <linux/dmaengine.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>
#include "hidma_mgmt.h"
#define HIDMA_QOS_N_OFFSET 0x700
#define HIDMA_CFG_OFFSET 0x400
#define HIDMA_MAX_BUS_REQ_LEN_OFFSET 0x41C
#define HIDMA_MAX_XACTIONS_OFFSET 0x420
#define HIDMA_HW_VERSION_OFFSET 0x424
#define HIDMA_CHRESET_TIMEOUT_OFFSET 0x418
#define HIDMA_MAX_WR_XACTIONS_MASK GENMASK(4, 0)
#define HIDMA_MAX_RD_XACTIONS_MASK GENMASK(4, 0)
#define HIDMA_WEIGHT_MASK GENMASK(6, 0)
#define HIDMA_MAX_BUS_REQ_LEN_MASK GENMASK(15, 0)
#define HIDMA_CHRESET_TIMEOUT_MASK GENMASK(19, 0)
#define HIDMA_MAX_WR_XACTIONS_BIT_POS 16
#define HIDMA_MAX_BUS_WR_REQ_BIT_POS 16
#define HIDMA_WRR_BIT_POS 8
#define HIDMA_PRIORITY_BIT_POS 15
#define HIDMA_AUTOSUSPEND_TIMEOUT 2000
#define HIDMA_MAX_CHANNEL_WEIGHT 15
static unsigned int max_write_request;
module_param(max_write_request, uint, 0644);
MODULE_PARM_DESC(max_write_request,
"maximum write burst (default: ACPI/DT value)");
static unsigned int max_read_request;
module_param(max_read_request, uint, 0644);
MODULE_PARM_DESC(max_read_request,
"maximum read burst (default: ACPI/DT value)");
static unsigned int max_wr_xactions;
module_param(max_wr_xactions, uint, 0644);
MODULE_PARM_DESC(max_wr_xactions,
"maximum number of write transactions (default: ACPI/DT value)");
static unsigned int max_rd_xactions;
module_param(max_rd_xactions, uint, 0644);
MODULE_PARM_DESC(max_rd_xactions,
"maximum number of read transactions (default: ACPI/DT value)");
int hidma_mgmt_setup(struct hidma_mgmt_dev *mgmtdev)
{
unsigned int i;
u32 val;
if (!is_power_of_2(mgmtdev->max_write_request) ||
(mgmtdev->max_write_request < 128) ||
(mgmtdev->max_write_request > 1024)) {
dev_err(&mgmtdev->pdev->dev, "invalid write request %d\n",
mgmtdev->max_write_request);
return -EINVAL;
}
if (!is_power_of_2(mgmtdev->max_read_request) ||
(mgmtdev->max_read_request < 128) ||
(mgmtdev->max_read_request > 1024)) {
dev_err(&mgmtdev->pdev->dev, "invalid read request %d\n",
mgmtdev->max_read_request);
return -EINVAL;
}
if (mgmtdev->max_wr_xactions > HIDMA_MAX_WR_XACTIONS_MASK) {
dev_err(&mgmtdev->pdev->dev,
"max_wr_xactions cannot be bigger than %ld\n",
HIDMA_MAX_WR_XACTIONS_MASK);
return -EINVAL;
}
if (mgmtdev->max_rd_xactions > HIDMA_MAX_RD_XACTIONS_MASK) {
dev_err(&mgmtdev->pdev->dev,
"max_rd_xactions cannot be bigger than %ld\n",
HIDMA_MAX_RD_XACTIONS_MASK);
return -EINVAL;
}
for (i = 0; i < mgmtdev->dma_channels; i++) {
if (mgmtdev->priority[i] > 1) {
dev_err(&mgmtdev->pdev->dev,
"priority can be 0 or 1\n");
return -EINVAL;
}
if (mgmtdev->weight[i] > HIDMA_MAX_CHANNEL_WEIGHT) {
dev_err(&mgmtdev->pdev->dev,
"max value of weight can be %d.\n",
HIDMA_MAX_CHANNEL_WEIGHT);
return -EINVAL;
}
/* weight needs to be at least one */
if (mgmtdev->weight[i] == 0)
mgmtdev->weight[i] = 1;
}
pm_runtime_get_sync(&mgmtdev->pdev->dev);
val = readl(mgmtdev->virtaddr + HIDMA_MAX_BUS_REQ_LEN_OFFSET);
val &= ~(HIDMA_MAX_BUS_REQ_LEN_MASK << HIDMA_MAX_BUS_WR_REQ_BIT_POS);
val |= mgmtdev->max_write_request << HIDMA_MAX_BUS_WR_REQ_BIT_POS;
val &= ~HIDMA_MAX_BUS_REQ_LEN_MASK;
val |= mgmtdev->max_read_request;
writel(val, mgmtdev->virtaddr + HIDMA_MAX_BUS_REQ_LEN_OFFSET);
val = readl(mgmtdev->virtaddr + HIDMA_MAX_XACTIONS_OFFSET);
val &= ~(HIDMA_MAX_WR_XACTIONS_MASK << HIDMA_MAX_WR_XACTIONS_BIT_POS);
val |= mgmtdev->max_wr_xactions << HIDMA_MAX_WR_XACTIONS_BIT_POS;
val &= ~HIDMA_MAX_RD_XACTIONS_MASK;
val |= mgmtdev->max_rd_xactions;
writel(val, mgmtdev->virtaddr + HIDMA_MAX_XACTIONS_OFFSET);
mgmtdev->hw_version =
readl(mgmtdev->virtaddr + HIDMA_HW_VERSION_OFFSET);
mgmtdev->hw_version_major = (mgmtdev->hw_version >> 28) & 0xF;
mgmtdev->hw_version_minor = (mgmtdev->hw_version >> 16) & 0xF;
for (i = 0; i < mgmtdev->dma_channels; i++) {
u32 weight = mgmtdev->weight[i];
u32 priority = mgmtdev->priority[i];
val = readl(mgmtdev->virtaddr + HIDMA_QOS_N_OFFSET + (4 * i));
val &= ~(1 << HIDMA_PRIORITY_BIT_POS);
val |= (priority & 0x1) << HIDMA_PRIORITY_BIT_POS;
val &= ~(HIDMA_WEIGHT_MASK << HIDMA_WRR_BIT_POS);
val |= (weight & HIDMA_WEIGHT_MASK) << HIDMA_WRR_BIT_POS;
writel(val, mgmtdev->virtaddr + HIDMA_QOS_N_OFFSET + (4 * i));
}
val = readl(mgmtdev->virtaddr + HIDMA_CHRESET_TIMEOUT_OFFSET);
val &= ~HIDMA_CHRESET_TIMEOUT_MASK;
val |= mgmtdev->chreset_timeout_cycles & HIDMA_CHRESET_TIMEOUT_MASK;
writel(val, mgmtdev->virtaddr + HIDMA_CHRESET_TIMEOUT_OFFSET);
pm_runtime_mark_last_busy(&mgmtdev->pdev->dev);
pm_runtime_put_autosuspend(&mgmtdev->pdev->dev);
return 0;
}
EXPORT_SYMBOL_GPL(hidma_mgmt_setup);
static int hidma_mgmt_probe(struct platform_device *pdev)
{
struct hidma_mgmt_dev *mgmtdev;
struct resource *res;
void __iomem *virtaddr;
int irq;
int rc;
u32 val;
pm_runtime_set_autosuspend_delay(&pdev->dev, HIDMA_AUTOSUSPEND_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
virtaddr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(virtaddr)) {
rc = PTR_ERR(virtaddr);
goto out;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
rc = irq;
goto out;
}
mgmtdev = devm_kzalloc(&pdev->dev, sizeof(*mgmtdev), GFP_KERNEL);
if (!mgmtdev) {
rc = -ENOMEM;
goto out;
}
mgmtdev->pdev = pdev;
mgmtdev->addrsize = resource_size(res);
mgmtdev->virtaddr = virtaddr;
rc = device_property_read_u32(&pdev->dev, "dma-channels",
&mgmtdev->dma_channels);
if (rc) {
dev_err(&pdev->dev, "number of channels missing\n");
goto out;
}
rc = device_property_read_u32(&pdev->dev,
"channel-reset-timeout-cycles",
&mgmtdev->chreset_timeout_cycles);
if (rc) {
dev_err(&pdev->dev, "channel reset timeout missing\n");
goto out;
}
rc = device_property_read_u32(&pdev->dev, "max-write-burst-bytes",
&mgmtdev->max_write_request);
if (rc) {
dev_err(&pdev->dev, "max-write-burst-bytes missing\n");
goto out;
}
if (max_write_request &&
(max_write_request != mgmtdev->max_write_request)) {
dev_info(&pdev->dev, "overriding max-write-burst-bytes: %d\n",
max_write_request);
mgmtdev->max_write_request = max_write_request;
} else
max_write_request = mgmtdev->max_write_request;
rc = device_property_read_u32(&pdev->dev, "max-read-burst-bytes",
&mgmtdev->max_read_request);
if (rc) {
dev_err(&pdev->dev, "max-read-burst-bytes missing\n");
goto out;
}
if (max_read_request &&
(max_read_request != mgmtdev->max_read_request)) {
dev_info(&pdev->dev, "overriding max-read-burst-bytes: %d\n",
max_read_request);
mgmtdev->max_read_request = max_read_request;
} else
max_read_request = mgmtdev->max_read_request;
rc = device_property_read_u32(&pdev->dev, "max-write-transactions",
&mgmtdev->max_wr_xactions);
if (rc) {
dev_err(&pdev->dev, "max-write-transactions missing\n");
goto out;
}
if (max_wr_xactions &&
(max_wr_xactions != mgmtdev->max_wr_xactions)) {
dev_info(&pdev->dev, "overriding max-write-transactions: %d\n",
max_wr_xactions);
mgmtdev->max_wr_xactions = max_wr_xactions;
} else
max_wr_xactions = mgmtdev->max_wr_xactions;
rc = device_property_read_u32(&pdev->dev, "max-read-transactions",
&mgmtdev->max_rd_xactions);
if (rc) {
dev_err(&pdev->dev, "max-read-transactions missing\n");
goto out;
}
if (max_rd_xactions &&
(max_rd_xactions != mgmtdev->max_rd_xactions)) {
dev_info(&pdev->dev, "overriding max-read-transactions: %d\n",
max_rd_xactions);
mgmtdev->max_rd_xactions = max_rd_xactions;
} else
max_rd_xactions = mgmtdev->max_rd_xactions;
mgmtdev->priority = devm_kcalloc(&pdev->dev,
mgmtdev->dma_channels,
sizeof(*mgmtdev->priority),
GFP_KERNEL);
if (!mgmtdev->priority) {
rc = -ENOMEM;
goto out;
}
mgmtdev->weight = devm_kcalloc(&pdev->dev,
mgmtdev->dma_channels,
sizeof(*mgmtdev->weight), GFP_KERNEL);
if (!mgmtdev->weight) {
rc = -ENOMEM;
goto out;
}
rc = hidma_mgmt_setup(mgmtdev);
if (rc) {
dev_err(&pdev->dev, "setup failed\n");
goto out;
}
/* start the HW */
val = readl(mgmtdev->virtaddr + HIDMA_CFG_OFFSET);
val |= 1;
writel(val, mgmtdev->virtaddr + HIDMA_CFG_OFFSET);
rc = hidma_mgmt_init_sys(mgmtdev);
if (rc) {
dev_err(&pdev->dev, "sysfs setup failed\n");
goto out;
}
dev_info(&pdev->dev,
"HW rev: %d.%d @ %pa with %d physical channels\n",
mgmtdev->hw_version_major, mgmtdev->hw_version_minor,
&res->start, mgmtdev->dma_channels);
platform_set_drvdata(pdev, mgmtdev);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
return 0;
out:
pm_runtime_put_sync_suspend(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return rc;
}
#if IS_ENABLED(CONFIG_ACPI)
static const struct acpi_device_id hidma_mgmt_acpi_ids[] = {
{"QCOM8060"},
{},
};
MODULE_DEVICE_TABLE(acpi, hidma_mgmt_acpi_ids);
#endif
static const struct of_device_id hidma_mgmt_match[] = {
{.compatible = "qcom,hidma-mgmt-1.0",},
{},
};
MODULE_DEVICE_TABLE(of, hidma_mgmt_match);
static struct platform_driver hidma_mgmt_driver = {
.probe = hidma_mgmt_probe,
.driver = {
.name = "hidma-mgmt",
.of_match_table = hidma_mgmt_match,
.acpi_match_table = ACPI_PTR(hidma_mgmt_acpi_ids),
},
};
#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
static int object_counter;
static int __init hidma_mgmt_of_populate_channels(struct device_node *np)
{
struct platform_device *pdev_parent = of_find_device_by_node(np);
struct platform_device_info pdevinfo;
struct device_node *child;
struct resource *res;
int ret = 0;
/* allocate a resource array */
res = kcalloc(3, sizeof(*res), GFP_KERNEL);
if (!res)
return -ENOMEM;
for_each_available_child_of_node(np, child) {
struct platform_device *new_pdev;
ret = of_address_to_resource(child, 0, &res[0]);
if (!ret)
goto out;
ret = of_address_to_resource(child, 1, &res[1]);
if (!ret)
goto out;
ret = of_irq_to_resource(child, 0, &res[2]);
if (ret <= 0)
goto out;
memset(&pdevinfo, 0, sizeof(pdevinfo));
pdevinfo.fwnode = &child->fwnode;
pdevinfo.parent = pdev_parent ? &pdev_parent->dev : NULL;
pdevinfo.name = child->name;
pdevinfo.id = object_counter++;
pdevinfo.res = res;
pdevinfo.num_res = 3;
pdevinfo.data = NULL;
pdevinfo.size_data = 0;
pdevinfo.dma_mask = DMA_BIT_MASK(64);
new_pdev = platform_device_register_full(&pdevinfo);
if (IS_ERR(new_pdev)) {
ret = PTR_ERR(new_pdev);
goto out;
}
new_pdev->dev.of_node = child;
of_dma_configure(&new_pdev->dev, child, true);
/*
* It is assumed that calling of_msi_configure is safe on
* platforms with or without MSI support.
*/
of_msi_configure(&new_pdev->dev, child);
}
kfree(res);
return ret;
out:
of_node_put(child);
kfree(res);
return ret;
}
#endif
static int __init hidma_mgmt_init(void)
{
#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
struct device_node *child;
for_each_matching_node(child, hidma_mgmt_match) {
/* device tree based firmware here */
hidma_mgmt_of_populate_channels(child);
}
#endif
/*
* We do not check for return value here, as it is assumed that
* platform_driver_register must not fail. The reason for this is that
* the (potential) hidma_mgmt_of_populate_channels calls above are not
* cleaned up if it does fail, and to do this work is quite
* complicated. In particular, various calls of of_address_to_resource,
* of_irq_to_resource, platform_device_register_full, of_dma_configure,
* and of_msi_configure which then call other functions and so on, must
* be cleaned up - this is not a trivial exercise.
*
* Currently, this module is not intended to be unloaded, and there is
* no module_exit function defined which does the needed cleanup. For
* this reason, we have to assume success here.
*/
platform_driver_register(&hidma_mgmt_driver);
return 0;
}
module_init(hidma_mgmt_init);
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/qcom/hidma_mgmt.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
*/
/*
* QCOM BAM DMA engine driver
*
* QCOM BAM DMA blocks are distributed amongst a number of the on-chip
* peripherals on the MSM 8x74. The configuration of the channels are dependent
* on the way they are hard wired to that specific peripheral. The peripheral
* device tree entries specify the configuration of each channel.
*
* The DMA controller requires the use of external memory for storage of the
* hardware descriptors for each channel. The descriptor FIFO is accessed as a
* circular buffer and operations are managed according to the offset within the
* FIFO. After pipe/channel reset, all of the pipe registers and internal state
* are back to defaults.
*
* During DMA operations, we write descriptors to the FIFO, being careful to
* handle wrapping and then write the last FIFO offset to that channel's
* P_EVNT_REG register to kick off the transaction. The P_SW_OFSTS register
* indicates the current FIFO offset that is being processed, so there is some
* indication of where the hardware is currently working.
*/
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_dma.h>
#include <linux/circ_buf.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/pm_runtime.h>
#include "../dmaengine.h"
#include "../virt-dma.h"
struct bam_desc_hw {
__le32 addr; /* Buffer physical address */
__le16 size; /* Buffer size in bytes */
__le16 flags;
};
#define BAM_DMA_AUTOSUSPEND_DELAY 100
#define DESC_FLAG_INT BIT(15)
#define DESC_FLAG_EOT BIT(14)
#define DESC_FLAG_EOB BIT(13)
#define DESC_FLAG_NWD BIT(12)
#define DESC_FLAG_CMD BIT(11)
struct bam_async_desc {
struct virt_dma_desc vd;
u32 num_desc;
u32 xfer_len;
/* transaction flags, EOT|EOB|NWD */
u16 flags;
struct bam_desc_hw *curr_desc;
/* list node for the desc in the bam_chan list of descriptors */
struct list_head desc_node;
enum dma_transfer_direction dir;
size_t length;
struct bam_desc_hw desc[];
};
enum bam_reg {
BAM_CTRL,
BAM_REVISION,
BAM_NUM_PIPES,
BAM_DESC_CNT_TRSHLD,
BAM_IRQ_SRCS,
BAM_IRQ_SRCS_MSK,
BAM_IRQ_SRCS_UNMASKED,
BAM_IRQ_STTS,
BAM_IRQ_CLR,
BAM_IRQ_EN,
BAM_CNFG_BITS,
BAM_IRQ_SRCS_EE,
BAM_IRQ_SRCS_MSK_EE,
BAM_P_CTRL,
BAM_P_RST,
BAM_P_HALT,
BAM_P_IRQ_STTS,
BAM_P_IRQ_CLR,
BAM_P_IRQ_EN,
BAM_P_EVNT_DEST_ADDR,
BAM_P_EVNT_REG,
BAM_P_SW_OFSTS,
BAM_P_DATA_FIFO_ADDR,
BAM_P_DESC_FIFO_ADDR,
BAM_P_EVNT_GEN_TRSHLD,
BAM_P_FIFO_SIZES,
};
struct reg_offset_data {
u32 base_offset;
unsigned int pipe_mult, evnt_mult, ee_mult;
};
static const struct reg_offset_data bam_v1_3_reg_info[] = {
[BAM_CTRL] = { 0x0F80, 0x00, 0x00, 0x00 },
[BAM_REVISION] = { 0x0F84, 0x00, 0x00, 0x00 },
[BAM_NUM_PIPES] = { 0x0FBC, 0x00, 0x00, 0x00 },
[BAM_DESC_CNT_TRSHLD] = { 0x0F88, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS] = { 0x0F8C, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS_MSK] = { 0x0F90, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS_UNMASKED] = { 0x0FB0, 0x00, 0x00, 0x00 },
[BAM_IRQ_STTS] = { 0x0F94, 0x00, 0x00, 0x00 },
[BAM_IRQ_CLR] = { 0x0F98, 0x00, 0x00, 0x00 },
[BAM_IRQ_EN] = { 0x0F9C, 0x00, 0x00, 0x00 },
[BAM_CNFG_BITS] = { 0x0FFC, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS_EE] = { 0x1800, 0x00, 0x00, 0x80 },
[BAM_IRQ_SRCS_MSK_EE] = { 0x1804, 0x00, 0x00, 0x80 },
[BAM_P_CTRL] = { 0x0000, 0x80, 0x00, 0x00 },
[BAM_P_RST] = { 0x0004, 0x80, 0x00, 0x00 },
[BAM_P_HALT] = { 0x0008, 0x80, 0x00, 0x00 },
[BAM_P_IRQ_STTS] = { 0x0010, 0x80, 0x00, 0x00 },
[BAM_P_IRQ_CLR] = { 0x0014, 0x80, 0x00, 0x00 },
[BAM_P_IRQ_EN] = { 0x0018, 0x80, 0x00, 0x00 },
[BAM_P_EVNT_DEST_ADDR] = { 0x102C, 0x00, 0x40, 0x00 },
[BAM_P_EVNT_REG] = { 0x1018, 0x00, 0x40, 0x00 },
[BAM_P_SW_OFSTS] = { 0x1000, 0x00, 0x40, 0x00 },
[BAM_P_DATA_FIFO_ADDR] = { 0x1024, 0x00, 0x40, 0x00 },
[BAM_P_DESC_FIFO_ADDR] = { 0x101C, 0x00, 0x40, 0x00 },
[BAM_P_EVNT_GEN_TRSHLD] = { 0x1028, 0x00, 0x40, 0x00 },
[BAM_P_FIFO_SIZES] = { 0x1020, 0x00, 0x40, 0x00 },
};
static const struct reg_offset_data bam_v1_4_reg_info[] = {
[BAM_CTRL] = { 0x0000, 0x00, 0x00, 0x00 },
[BAM_REVISION] = { 0x0004, 0x00, 0x00, 0x00 },
[BAM_NUM_PIPES] = { 0x003C, 0x00, 0x00, 0x00 },
[BAM_DESC_CNT_TRSHLD] = { 0x0008, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS] = { 0x000C, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS_MSK] = { 0x0010, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS_UNMASKED] = { 0x0030, 0x00, 0x00, 0x00 },
[BAM_IRQ_STTS] = { 0x0014, 0x00, 0x00, 0x00 },
[BAM_IRQ_CLR] = { 0x0018, 0x00, 0x00, 0x00 },
[BAM_IRQ_EN] = { 0x001C, 0x00, 0x00, 0x00 },
[BAM_CNFG_BITS] = { 0x007C, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS_EE] = { 0x0800, 0x00, 0x00, 0x80 },
[BAM_IRQ_SRCS_MSK_EE] = { 0x0804, 0x00, 0x00, 0x80 },
[BAM_P_CTRL] = { 0x1000, 0x1000, 0x00, 0x00 },
[BAM_P_RST] = { 0x1004, 0x1000, 0x00, 0x00 },
[BAM_P_HALT] = { 0x1008, 0x1000, 0x00, 0x00 },
[BAM_P_IRQ_STTS] = { 0x1010, 0x1000, 0x00, 0x00 },
[BAM_P_IRQ_CLR] = { 0x1014, 0x1000, 0x00, 0x00 },
[BAM_P_IRQ_EN] = { 0x1018, 0x1000, 0x00, 0x00 },
[BAM_P_EVNT_DEST_ADDR] = { 0x182C, 0x00, 0x1000, 0x00 },
[BAM_P_EVNT_REG] = { 0x1818, 0x00, 0x1000, 0x00 },
[BAM_P_SW_OFSTS] = { 0x1800, 0x00, 0x1000, 0x00 },
[BAM_P_DATA_FIFO_ADDR] = { 0x1824, 0x00, 0x1000, 0x00 },
[BAM_P_DESC_FIFO_ADDR] = { 0x181C, 0x00, 0x1000, 0x00 },
[BAM_P_EVNT_GEN_TRSHLD] = { 0x1828, 0x00, 0x1000, 0x00 },
[BAM_P_FIFO_SIZES] = { 0x1820, 0x00, 0x1000, 0x00 },
};
static const struct reg_offset_data bam_v1_7_reg_info[] = {
[BAM_CTRL] = { 0x00000, 0x00, 0x00, 0x00 },
[BAM_REVISION] = { 0x01000, 0x00, 0x00, 0x00 },
[BAM_NUM_PIPES] = { 0x01008, 0x00, 0x00, 0x00 },
[BAM_DESC_CNT_TRSHLD] = { 0x00008, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS] = { 0x03010, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS_MSK] = { 0x03014, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS_UNMASKED] = { 0x03018, 0x00, 0x00, 0x00 },
[BAM_IRQ_STTS] = { 0x00014, 0x00, 0x00, 0x00 },
[BAM_IRQ_CLR] = { 0x00018, 0x00, 0x00, 0x00 },
[BAM_IRQ_EN] = { 0x0001C, 0x00, 0x00, 0x00 },
[BAM_CNFG_BITS] = { 0x0007C, 0x00, 0x00, 0x00 },
[BAM_IRQ_SRCS_EE] = { 0x03000, 0x00, 0x00, 0x1000 },
[BAM_IRQ_SRCS_MSK_EE] = { 0x03004, 0x00, 0x00, 0x1000 },
[BAM_P_CTRL] = { 0x13000, 0x1000, 0x00, 0x00 },
[BAM_P_RST] = { 0x13004, 0x1000, 0x00, 0x00 },
[BAM_P_HALT] = { 0x13008, 0x1000, 0x00, 0x00 },
[BAM_P_IRQ_STTS] = { 0x13010, 0x1000, 0x00, 0x00 },
[BAM_P_IRQ_CLR] = { 0x13014, 0x1000, 0x00, 0x00 },
[BAM_P_IRQ_EN] = { 0x13018, 0x1000, 0x00, 0x00 },
[BAM_P_EVNT_DEST_ADDR] = { 0x1382C, 0x00, 0x1000, 0x00 },
[BAM_P_EVNT_REG] = { 0x13818, 0x00, 0x1000, 0x00 },
[BAM_P_SW_OFSTS] = { 0x13800, 0x00, 0x1000, 0x00 },
[BAM_P_DATA_FIFO_ADDR] = { 0x13824, 0x00, 0x1000, 0x00 },
[BAM_P_DESC_FIFO_ADDR] = { 0x1381C, 0x00, 0x1000, 0x00 },
[BAM_P_EVNT_GEN_TRSHLD] = { 0x13828, 0x00, 0x1000, 0x00 },
[BAM_P_FIFO_SIZES] = { 0x13820, 0x00, 0x1000, 0x00 },
};
/* BAM CTRL */
#define BAM_SW_RST BIT(0)
#define BAM_EN BIT(1)
#define BAM_EN_ACCUM BIT(4)
#define BAM_TESTBUS_SEL_SHIFT 5
#define BAM_TESTBUS_SEL_MASK 0x3F
#define BAM_DESC_CACHE_SEL_SHIFT 13
#define BAM_DESC_CACHE_SEL_MASK 0x3
#define BAM_CACHED_DESC_STORE BIT(15)
#define IBC_DISABLE BIT(16)
/* BAM REVISION */
#define REVISION_SHIFT 0
#define REVISION_MASK 0xFF
#define NUM_EES_SHIFT 8
#define NUM_EES_MASK 0xF
#define CE_BUFFER_SIZE BIT(13)
#define AXI_ACTIVE BIT(14)
#define USE_VMIDMT BIT(15)
#define SECURED BIT(16)
#define BAM_HAS_NO_BYPASS BIT(17)
#define HIGH_FREQUENCY_BAM BIT(18)
#define INACTIV_TMRS_EXST BIT(19)
#define NUM_INACTIV_TMRS BIT(20)
#define DESC_CACHE_DEPTH_SHIFT 21
#define DESC_CACHE_DEPTH_1 (0 << DESC_CACHE_DEPTH_SHIFT)
#define DESC_CACHE_DEPTH_2 (1 << DESC_CACHE_DEPTH_SHIFT)
#define DESC_CACHE_DEPTH_3 (2 << DESC_CACHE_DEPTH_SHIFT)
#define DESC_CACHE_DEPTH_4 (3 << DESC_CACHE_DEPTH_SHIFT)
#define CMD_DESC_EN BIT(23)
#define INACTIV_TMR_BASE_SHIFT 24
#define INACTIV_TMR_BASE_MASK 0xFF
/* BAM NUM PIPES */
#define BAM_NUM_PIPES_SHIFT 0
#define BAM_NUM_PIPES_MASK 0xFF
#define PERIPH_NON_PIPE_GRP_SHIFT 16
#define PERIPH_NON_PIP_GRP_MASK 0xFF
#define BAM_NON_PIPE_GRP_SHIFT 24
#define BAM_NON_PIPE_GRP_MASK 0xFF
/* BAM CNFG BITS */
#define BAM_PIPE_CNFG BIT(2)
#define BAM_FULL_PIPE BIT(11)
#define BAM_NO_EXT_P_RST BIT(12)
#define BAM_IBC_DISABLE BIT(13)
#define BAM_SB_CLK_REQ BIT(14)
#define BAM_PSM_CSW_REQ BIT(15)
#define BAM_PSM_P_RES BIT(16)
#define BAM_AU_P_RES BIT(17)
#define BAM_SI_P_RES BIT(18)
#define BAM_WB_P_RES BIT(19)
#define BAM_WB_BLK_CSW BIT(20)
#define BAM_WB_CSW_ACK_IDL BIT(21)
#define BAM_WB_RETR_SVPNT BIT(22)
#define BAM_WB_DSC_AVL_P_RST BIT(23)
#define BAM_REG_P_EN BIT(24)
#define BAM_PSM_P_HD_DATA BIT(25)
#define BAM_AU_ACCUMED BIT(26)
#define BAM_CMD_ENABLE BIT(27)
#define BAM_CNFG_BITS_DEFAULT (BAM_PIPE_CNFG | \
BAM_NO_EXT_P_RST | \
BAM_IBC_DISABLE | \
BAM_SB_CLK_REQ | \
BAM_PSM_CSW_REQ | \
BAM_PSM_P_RES | \
BAM_AU_P_RES | \
BAM_SI_P_RES | \
BAM_WB_P_RES | \
BAM_WB_BLK_CSW | \
BAM_WB_CSW_ACK_IDL | \
BAM_WB_RETR_SVPNT | \
BAM_WB_DSC_AVL_P_RST | \
BAM_REG_P_EN | \
BAM_PSM_P_HD_DATA | \
BAM_AU_ACCUMED | \
BAM_CMD_ENABLE)
/* PIPE CTRL */
#define P_EN BIT(1)
#define P_DIRECTION BIT(3)
#define P_SYS_STRM BIT(4)
#define P_SYS_MODE BIT(5)
#define P_AUTO_EOB BIT(6)
#define P_AUTO_EOB_SEL_SHIFT 7
#define P_AUTO_EOB_SEL_512 (0 << P_AUTO_EOB_SEL_SHIFT)
#define P_AUTO_EOB_SEL_256 (1 << P_AUTO_EOB_SEL_SHIFT)
#define P_AUTO_EOB_SEL_128 (2 << P_AUTO_EOB_SEL_SHIFT)
#define P_AUTO_EOB_SEL_64 (3 << P_AUTO_EOB_SEL_SHIFT)
#define P_PREFETCH_LIMIT_SHIFT 9
#define P_PREFETCH_LIMIT_32 (0 << P_PREFETCH_LIMIT_SHIFT)
#define P_PREFETCH_LIMIT_16 (1 << P_PREFETCH_LIMIT_SHIFT)
#define P_PREFETCH_LIMIT_4 (2 << P_PREFETCH_LIMIT_SHIFT)
#define P_WRITE_NWD BIT(11)
#define P_LOCK_GROUP_SHIFT 16
#define P_LOCK_GROUP_MASK 0x1F
/* BAM_DESC_CNT_TRSHLD */
#define CNT_TRSHLD 0xffff
#define DEFAULT_CNT_THRSHLD 0x4
/* BAM_IRQ_SRCS */
#define BAM_IRQ BIT(31)
#define P_IRQ 0x7fffffff
/* BAM_IRQ_SRCS_MSK */
#define BAM_IRQ_MSK BAM_IRQ
#define P_IRQ_MSK P_IRQ
/* BAM_IRQ_STTS */
#define BAM_TIMER_IRQ BIT(4)
#define BAM_EMPTY_IRQ BIT(3)
#define BAM_ERROR_IRQ BIT(2)
#define BAM_HRESP_ERR_IRQ BIT(1)
/* BAM_IRQ_CLR */
#define BAM_TIMER_CLR BIT(4)
#define BAM_EMPTY_CLR BIT(3)
#define BAM_ERROR_CLR BIT(2)
#define BAM_HRESP_ERR_CLR BIT(1)
/* BAM_IRQ_EN */
#define BAM_TIMER_EN BIT(4)
#define BAM_EMPTY_EN BIT(3)
#define BAM_ERROR_EN BIT(2)
#define BAM_HRESP_ERR_EN BIT(1)
/* BAM_P_IRQ_EN */
#define P_PRCSD_DESC_EN BIT(0)
#define P_TIMER_EN BIT(1)
#define P_WAKE_EN BIT(2)
#define P_OUT_OF_DESC_EN BIT(3)
#define P_ERR_EN BIT(4)
#define P_TRNSFR_END_EN BIT(5)
#define P_DEFAULT_IRQS_EN (P_PRCSD_DESC_EN | P_ERR_EN | P_TRNSFR_END_EN)
/* BAM_P_SW_OFSTS */
#define P_SW_OFSTS_MASK 0xffff
#define BAM_DESC_FIFO_SIZE SZ_32K
#define MAX_DESCRIPTORS (BAM_DESC_FIFO_SIZE / sizeof(struct bam_desc_hw) - 1)
#define BAM_FIFO_SIZE (SZ_32K - 8)
#define IS_BUSY(chan) (CIRC_SPACE(bchan->tail, bchan->head,\
MAX_DESCRIPTORS + 1) == 0)
struct bam_chan {
struct virt_dma_chan vc;
struct bam_device *bdev;
/* configuration from device tree */
u32 id;
/* runtime configuration */
struct dma_slave_config slave;
/* fifo storage */
struct bam_desc_hw *fifo_virt;
dma_addr_t fifo_phys;
/* fifo markers */
unsigned short head; /* start of active descriptor entries */
unsigned short tail; /* end of active descriptor entries */
unsigned int initialized; /* is the channel hw initialized? */
unsigned int paused; /* is the channel paused? */
unsigned int reconfigure; /* new slave config? */
/* list of descriptors currently processed */
struct list_head desc_list;
struct list_head node;
};
static inline struct bam_chan *to_bam_chan(struct dma_chan *common)
{
return container_of(common, struct bam_chan, vc.chan);
}
struct bam_device {
void __iomem *regs;
struct device *dev;
struct dma_device common;
struct bam_chan *channels;
u32 num_channels;
u32 num_ees;
/* execution environment ID, from DT */
u32 ee;
bool controlled_remotely;
bool powered_remotely;
u32 active_channels;
const struct reg_offset_data *layout;
struct clk *bamclk;
int irq;
/* dma start transaction tasklet */
struct tasklet_struct task;
};
/**
* bam_addr - returns BAM register address
* @bdev: bam device
* @pipe: pipe instance (ignored when register doesn't have multiple instances)
* @reg: register enum
*/
static inline void __iomem *bam_addr(struct bam_device *bdev, u32 pipe,
enum bam_reg reg)
{
const struct reg_offset_data r = bdev->layout[reg];
return bdev->regs + r.base_offset +
r.pipe_mult * pipe +
r.evnt_mult * pipe +
r.ee_mult * bdev->ee;
}
/**
* bam_reset() - reset and initialize BAM registers
* @bdev: bam device
*/
static void bam_reset(struct bam_device *bdev)
{
u32 val;
/* s/w reset bam */
/* after reset all pipes are disabled and idle */
val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL));
val |= BAM_SW_RST;
writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
val &= ~BAM_SW_RST;
writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
/* make sure previous stores are visible before enabling BAM */
wmb();
/* enable bam */
val |= BAM_EN;
writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
/* set descriptor threshhold, start with 4 bytes */
writel_relaxed(DEFAULT_CNT_THRSHLD,
bam_addr(bdev, 0, BAM_DESC_CNT_TRSHLD));
/* Enable default set of h/w workarounds, ie all except BAM_FULL_PIPE */
writel_relaxed(BAM_CNFG_BITS_DEFAULT, bam_addr(bdev, 0, BAM_CNFG_BITS));
/* enable irqs for errors */
writel_relaxed(BAM_ERROR_EN | BAM_HRESP_ERR_EN,
bam_addr(bdev, 0, BAM_IRQ_EN));
/* unmask global bam interrupt */
writel_relaxed(BAM_IRQ_MSK, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE));
}
/**
* bam_reset_channel - Reset individual BAM DMA channel
* @bchan: bam channel
*
* This function resets a specific BAM channel
*/
static void bam_reset_channel(struct bam_chan *bchan)
{
struct bam_device *bdev = bchan->bdev;
lockdep_assert_held(&bchan->vc.lock);
/* reset channel */
writel_relaxed(1, bam_addr(bdev, bchan->id, BAM_P_RST));
writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_RST));
/* don't allow cpu to reorder BAM register accesses done after this */
wmb();
/* make sure hw is initialized when channel is used the first time */
bchan->initialized = 0;
}
/**
* bam_chan_init_hw - Initialize channel hardware
* @bchan: bam channel
* @dir: DMA transfer direction
*
* This function resets and initializes the BAM channel
*/
static void bam_chan_init_hw(struct bam_chan *bchan,
enum dma_transfer_direction dir)
{
struct bam_device *bdev = bchan->bdev;
u32 val;
/* Reset the channel to clear internal state of the FIFO */
bam_reset_channel(bchan);
/*
* write out 8 byte aligned address. We have enough space for this
* because we allocated 1 more descriptor (8 bytes) than we can use
*/
writel_relaxed(ALIGN(bchan->fifo_phys, sizeof(struct bam_desc_hw)),
bam_addr(bdev, bchan->id, BAM_P_DESC_FIFO_ADDR));
writel_relaxed(BAM_FIFO_SIZE,
bam_addr(bdev, bchan->id, BAM_P_FIFO_SIZES));
/* enable the per pipe interrupts, enable EOT, ERR, and INT irqs */
writel_relaxed(P_DEFAULT_IRQS_EN,
bam_addr(bdev, bchan->id, BAM_P_IRQ_EN));
/* unmask the specific pipe and EE combo */
val = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE));
val |= BIT(bchan->id);
writel_relaxed(val, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE));
/* don't allow cpu to reorder the channel enable done below */
wmb();
/* set fixed direction and mode, then enable channel */
val = P_EN | P_SYS_MODE;
if (dir == DMA_DEV_TO_MEM)
val |= P_DIRECTION;
writel_relaxed(val, bam_addr(bdev, bchan->id, BAM_P_CTRL));
bchan->initialized = 1;
/* init FIFO pointers */
bchan->head = 0;
bchan->tail = 0;
}
/**
* bam_alloc_chan - Allocate channel resources for DMA channel.
* @chan: specified channel
*
* This function allocates the FIFO descriptor memory
*/
static int bam_alloc_chan(struct dma_chan *chan)
{
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_device *bdev = bchan->bdev;
if (bchan->fifo_virt)
return 0;
/* allocate FIFO descriptor space, but only if necessary */
bchan->fifo_virt = dma_alloc_wc(bdev->dev, BAM_DESC_FIFO_SIZE,
&bchan->fifo_phys, GFP_KERNEL);
if (!bchan->fifo_virt) {
dev_err(bdev->dev, "Failed to allocate desc fifo\n");
return -ENOMEM;
}
if (bdev->active_channels++ == 0 && bdev->powered_remotely)
bam_reset(bdev);
return 0;
}
/**
* bam_free_chan - Frees dma resources associated with specific channel
* @chan: specified channel
*
* Free the allocated fifo descriptor memory and channel resources
*
*/
static void bam_free_chan(struct dma_chan *chan)
{
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_device *bdev = bchan->bdev;
u32 val;
unsigned long flags;
int ret;
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return;
vchan_free_chan_resources(to_virt_chan(chan));
if (!list_empty(&bchan->desc_list)) {
dev_err(bchan->bdev->dev, "Cannot free busy channel\n");
goto err;
}
spin_lock_irqsave(&bchan->vc.lock, flags);
bam_reset_channel(bchan);
spin_unlock_irqrestore(&bchan->vc.lock, flags);
dma_free_wc(bdev->dev, BAM_DESC_FIFO_SIZE, bchan->fifo_virt,
bchan->fifo_phys);
bchan->fifo_virt = NULL;
/* mask irq for pipe/channel */
val = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE));
val &= ~BIT(bchan->id);
writel_relaxed(val, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE));
/* disable irq */
writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_IRQ_EN));
if (--bdev->active_channels == 0 && bdev->powered_remotely) {
/* s/w reset bam */
val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL));
val |= BAM_SW_RST;
writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL));
}
err:
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
}
/**
* bam_slave_config - set slave configuration for channel
* @chan: dma channel
* @cfg: slave configuration
*
* Sets slave configuration for channel
*
*/
static int bam_slave_config(struct dma_chan *chan,
struct dma_slave_config *cfg)
{
struct bam_chan *bchan = to_bam_chan(chan);
unsigned long flag;
spin_lock_irqsave(&bchan->vc.lock, flag);
memcpy(&bchan->slave, cfg, sizeof(*cfg));
bchan->reconfigure = 1;
spin_unlock_irqrestore(&bchan->vc.lock, flag);
return 0;
}
/**
* bam_prep_slave_sg - Prep slave sg transaction
*
* @chan: dma channel
* @sgl: scatter gather list
* @sg_len: length of sg
* @direction: DMA transfer direction
* @flags: DMA flags
* @context: transfer context (unused)
*/
static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long flags,
void *context)
{
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_device *bdev = bchan->bdev;
struct bam_async_desc *async_desc;
struct scatterlist *sg;
u32 i;
struct bam_desc_hw *desc;
unsigned int num_alloc = 0;
if (!is_slave_direction(direction)) {
dev_err(bdev->dev, "invalid dma direction\n");
return NULL;
}
/* calculate number of required entries */
for_each_sg(sgl, sg, sg_len, i)
num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_FIFO_SIZE);
/* allocate enough room to accomodate the number of entries */
async_desc = kzalloc(struct_size(async_desc, desc, num_alloc),
GFP_NOWAIT);
if (!async_desc)
return NULL;
if (flags & DMA_PREP_FENCE)
async_desc->flags |= DESC_FLAG_NWD;
if (flags & DMA_PREP_INTERRUPT)
async_desc->flags |= DESC_FLAG_EOT;
async_desc->num_desc = num_alloc;
async_desc->curr_desc = async_desc->desc;
async_desc->dir = direction;
/* fill in temporary descriptors */
desc = async_desc->desc;
for_each_sg(sgl, sg, sg_len, i) {
unsigned int remainder = sg_dma_len(sg);
unsigned int curr_offset = 0;
do {
if (flags & DMA_PREP_CMD)
desc->flags |= cpu_to_le16(DESC_FLAG_CMD);
desc->addr = cpu_to_le32(sg_dma_address(sg) +
curr_offset);
if (remainder > BAM_FIFO_SIZE) {
desc->size = cpu_to_le16(BAM_FIFO_SIZE);
remainder -= BAM_FIFO_SIZE;
curr_offset += BAM_FIFO_SIZE;
} else {
desc->size = cpu_to_le16(remainder);
remainder = 0;
}
async_desc->length += le16_to_cpu(desc->size);
desc++;
} while (remainder > 0);
}
return vchan_tx_prep(&bchan->vc, &async_desc->vd, flags);
}
/**
* bam_dma_terminate_all - terminate all transactions on a channel
* @chan: bam dma channel
*
* Dequeues and frees all transactions
* No callbacks are done
*
*/
static int bam_dma_terminate_all(struct dma_chan *chan)
{
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_async_desc *async_desc, *tmp;
unsigned long flag;
LIST_HEAD(head);
/* remove all transactions, including active transaction */
spin_lock_irqsave(&bchan->vc.lock, flag);
/*
* If we have transactions queued, then some might be committed to the
* hardware in the desc fifo. The only way to reset the desc fifo is
* to do a hardware reset (either by pipe or the entire block).
* bam_chan_init_hw() will trigger a pipe reset, and also reinit the
* pipe. If the pipe is left disabled (default state after pipe reset)
* and is accessed by a connected hardware engine, a fatal error in
* the BAM will occur. There is a small window where this could happen
* with bam_chan_init_hw(), but it is assumed that the caller has
* stopped activity on any attached hardware engine. Make sure to do
* this first so that the BAM hardware doesn't cause memory corruption
* by accessing freed resources.
*/
if (!list_empty(&bchan->desc_list)) {
async_desc = list_first_entry(&bchan->desc_list,
struct bam_async_desc, desc_node);
bam_chan_init_hw(bchan, async_desc->dir);
}
list_for_each_entry_safe(async_desc, tmp,
&bchan->desc_list, desc_node) {
list_add(&async_desc->vd.node, &bchan->vc.desc_issued);
list_del(&async_desc->desc_node);
}
vchan_get_all_descriptors(&bchan->vc, &head);
spin_unlock_irqrestore(&bchan->vc.lock, flag);
vchan_dma_desc_free_list(&bchan->vc, &head);
return 0;
}
/**
* bam_pause - Pause DMA channel
* @chan: dma channel
*
*/
static int bam_pause(struct dma_chan *chan)
{
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_device *bdev = bchan->bdev;
unsigned long flag;
int ret;
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return ret;
spin_lock_irqsave(&bchan->vc.lock, flag);
writel_relaxed(1, bam_addr(bdev, bchan->id, BAM_P_HALT));
bchan->paused = 1;
spin_unlock_irqrestore(&bchan->vc.lock, flag);
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
return 0;
}
/**
* bam_resume - Resume DMA channel operations
* @chan: dma channel
*
*/
static int bam_resume(struct dma_chan *chan)
{
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_device *bdev = bchan->bdev;
unsigned long flag;
int ret;
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return ret;
spin_lock_irqsave(&bchan->vc.lock, flag);
writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_HALT));
bchan->paused = 0;
spin_unlock_irqrestore(&bchan->vc.lock, flag);
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
return 0;
}
/**
* process_channel_irqs - processes the channel interrupts
* @bdev: bam controller
*
* This function processes the channel interrupts
*
*/
static u32 process_channel_irqs(struct bam_device *bdev)
{
u32 i, srcs, pipe_stts, offset, avail;
unsigned long flags;
struct bam_async_desc *async_desc, *tmp;
srcs = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_EE));
/* return early if no pipe/channel interrupts are present */
if (!(srcs & P_IRQ))
return srcs;
for (i = 0; i < bdev->num_channels; i++) {
struct bam_chan *bchan = &bdev->channels[i];
if (!(srcs & BIT(i)))
continue;
/* clear pipe irq */
pipe_stts = readl_relaxed(bam_addr(bdev, i, BAM_P_IRQ_STTS));
writel_relaxed(pipe_stts, bam_addr(bdev, i, BAM_P_IRQ_CLR));
spin_lock_irqsave(&bchan->vc.lock, flags);
offset = readl_relaxed(bam_addr(bdev, i, BAM_P_SW_OFSTS)) &
P_SW_OFSTS_MASK;
offset /= sizeof(struct bam_desc_hw);
/* Number of bytes available to read */
avail = CIRC_CNT(offset, bchan->head, MAX_DESCRIPTORS + 1);
if (offset < bchan->head)
avail--;
list_for_each_entry_safe(async_desc, tmp,
&bchan->desc_list, desc_node) {
/* Not enough data to read */
if (avail < async_desc->xfer_len)
break;
/* manage FIFO */
bchan->head += async_desc->xfer_len;
bchan->head %= MAX_DESCRIPTORS;
async_desc->num_desc -= async_desc->xfer_len;
async_desc->curr_desc += async_desc->xfer_len;
avail -= async_desc->xfer_len;
/*
* if complete, process cookie. Otherwise
* push back to front of desc_issued so that
* it gets restarted by the tasklet
*/
if (!async_desc->num_desc) {
vchan_cookie_complete(&async_desc->vd);
} else {
list_add(&async_desc->vd.node,
&bchan->vc.desc_issued);
}
list_del(&async_desc->desc_node);
}
spin_unlock_irqrestore(&bchan->vc.lock, flags);
}
return srcs;
}
/**
* bam_dma_irq - irq handler for bam controller
* @irq: IRQ of interrupt
* @data: callback data
*
* IRQ handler for the bam controller
*/
static irqreturn_t bam_dma_irq(int irq, void *data)
{
struct bam_device *bdev = data;
u32 clr_mask = 0, srcs = 0;
int ret;
srcs |= process_channel_irqs(bdev);
/* kick off tasklet to start next dma transfer */
if (srcs & P_IRQ)
tasklet_schedule(&bdev->task);
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return IRQ_NONE;
if (srcs & BAM_IRQ) {
clr_mask = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_STTS));
/*
* don't allow reorder of the various accesses to the BAM
* registers
*/
mb();
writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR));
}
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
return IRQ_HANDLED;
}
/**
* bam_tx_status - returns status of transaction
* @chan: dma channel
* @cookie: transaction cookie
* @txstate: DMA transaction state
*
* Return status of dma transaction
*/
static enum dma_status bam_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_async_desc *async_desc;
struct virt_dma_desc *vd;
int ret;
size_t residue = 0;
unsigned int i;
unsigned long flags;
ret = dma_cookie_status(chan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
if (!txstate)
return bchan->paused ? DMA_PAUSED : ret;
spin_lock_irqsave(&bchan->vc.lock, flags);
vd = vchan_find_desc(&bchan->vc, cookie);
if (vd) {
residue = container_of(vd, struct bam_async_desc, vd)->length;
} else {
list_for_each_entry(async_desc, &bchan->desc_list, desc_node) {
if (async_desc->vd.tx.cookie != cookie)
continue;
for (i = 0; i < async_desc->num_desc; i++)
residue += le16_to_cpu(
async_desc->curr_desc[i].size);
}
}
spin_unlock_irqrestore(&bchan->vc.lock, flags);
dma_set_residue(txstate, residue);
if (ret == DMA_IN_PROGRESS && bchan->paused)
ret = DMA_PAUSED;
return ret;
}
/**
* bam_apply_new_config
* @bchan: bam dma channel
* @dir: DMA direction
*/
static void bam_apply_new_config(struct bam_chan *bchan,
enum dma_transfer_direction dir)
{
struct bam_device *bdev = bchan->bdev;
u32 maxburst;
if (!bdev->controlled_remotely) {
if (dir == DMA_DEV_TO_MEM)
maxburst = bchan->slave.src_maxburst;
else
maxburst = bchan->slave.dst_maxburst;
writel_relaxed(maxburst,
bam_addr(bdev, 0, BAM_DESC_CNT_TRSHLD));
}
bchan->reconfigure = 0;
}
/**
* bam_start_dma - start next transaction
* @bchan: bam dma channel
*/
static void bam_start_dma(struct bam_chan *bchan)
{
struct virt_dma_desc *vd = vchan_next_desc(&bchan->vc);
struct bam_device *bdev = bchan->bdev;
struct bam_async_desc *async_desc = NULL;
struct bam_desc_hw *desc;
struct bam_desc_hw *fifo = PTR_ALIGN(bchan->fifo_virt,
sizeof(struct bam_desc_hw));
int ret;
unsigned int avail;
struct dmaengine_desc_callback cb;
lockdep_assert_held(&bchan->vc.lock);
if (!vd)
return;
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return;
while (vd && !IS_BUSY(bchan)) {
list_del(&vd->node);
async_desc = container_of(vd, struct bam_async_desc, vd);
/* on first use, initialize the channel hardware */
if (!bchan->initialized)
bam_chan_init_hw(bchan, async_desc->dir);
/* apply new slave config changes, if necessary */
if (bchan->reconfigure)
bam_apply_new_config(bchan, async_desc->dir);
desc = async_desc->curr_desc;
avail = CIRC_SPACE(bchan->tail, bchan->head,
MAX_DESCRIPTORS + 1);
if (async_desc->num_desc > avail)
async_desc->xfer_len = avail;
else
async_desc->xfer_len = async_desc->num_desc;
/* set any special flags on the last descriptor */
if (async_desc->num_desc == async_desc->xfer_len)
desc[async_desc->xfer_len - 1].flags |=
cpu_to_le16(async_desc->flags);
vd = vchan_next_desc(&bchan->vc);
dmaengine_desc_get_callback(&async_desc->vd.tx, &cb);
/*
* An interrupt is generated at this desc, if
* - FIFO is FULL.
* - No more descriptors to add.
* - If a callback completion was requested for this DESC,
* In this case, BAM will deliver the completion callback
* for this desc and continue processing the next desc.
*/
if (((avail <= async_desc->xfer_len) || !vd ||
dmaengine_desc_callback_valid(&cb)) &&
!(async_desc->flags & DESC_FLAG_EOT))
desc[async_desc->xfer_len - 1].flags |=
cpu_to_le16(DESC_FLAG_INT);
if (bchan->tail + async_desc->xfer_len > MAX_DESCRIPTORS) {
u32 partial = MAX_DESCRIPTORS - bchan->tail;
memcpy(&fifo[bchan->tail], desc,
partial * sizeof(struct bam_desc_hw));
memcpy(fifo, &desc[partial],
(async_desc->xfer_len - partial) *
sizeof(struct bam_desc_hw));
} else {
memcpy(&fifo[bchan->tail], desc,
async_desc->xfer_len *
sizeof(struct bam_desc_hw));
}
bchan->tail += async_desc->xfer_len;
bchan->tail %= MAX_DESCRIPTORS;
list_add_tail(&async_desc->desc_node, &bchan->desc_list);
}
/* ensure descriptor writes and dma start not reordered */
wmb();
writel_relaxed(bchan->tail * sizeof(struct bam_desc_hw),
bam_addr(bdev, bchan->id, BAM_P_EVNT_REG));
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
}
/**
* dma_tasklet - DMA IRQ tasklet
* @t: tasklet argument (bam controller structure)
*
* Sets up next DMA operation and then processes all completed transactions
*/
static void dma_tasklet(struct tasklet_struct *t)
{
struct bam_device *bdev = from_tasklet(bdev, t, task);
struct bam_chan *bchan;
unsigned long flags;
unsigned int i;
/* go through the channels and kick off transactions */
for (i = 0; i < bdev->num_channels; i++) {
bchan = &bdev->channels[i];
spin_lock_irqsave(&bchan->vc.lock, flags);
if (!list_empty(&bchan->vc.desc_issued) && !IS_BUSY(bchan))
bam_start_dma(bchan);
spin_unlock_irqrestore(&bchan->vc.lock, flags);
}
}
/**
* bam_issue_pending - starts pending transactions
* @chan: dma channel
*
* Calls tasklet directly which in turn starts any pending transactions
*/
static void bam_issue_pending(struct dma_chan *chan)
{
struct bam_chan *bchan = to_bam_chan(chan);
unsigned long flags;
spin_lock_irqsave(&bchan->vc.lock, flags);
/* if work pending and idle, start a transaction */
if (vchan_issue_pending(&bchan->vc) && !IS_BUSY(bchan))
bam_start_dma(bchan);
spin_unlock_irqrestore(&bchan->vc.lock, flags);
}
/**
* bam_dma_free_desc - free descriptor memory
* @vd: virtual descriptor
*
*/
static void bam_dma_free_desc(struct virt_dma_desc *vd)
{
struct bam_async_desc *async_desc = container_of(vd,
struct bam_async_desc, vd);
kfree(async_desc);
}
static struct dma_chan *bam_dma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *of)
{
struct bam_device *bdev = container_of(of->of_dma_data,
struct bam_device, common);
unsigned int request;
if (dma_spec->args_count != 1)
return NULL;
request = dma_spec->args[0];
if (request >= bdev->num_channels)
return NULL;
return dma_get_slave_channel(&(bdev->channels[request].vc.chan));
}
/**
* bam_init
* @bdev: bam device
*
* Initialization helper for global bam registers
*/
static int bam_init(struct bam_device *bdev)
{
u32 val;
/* read revision and configuration information */
if (!bdev->num_ees) {
val = readl_relaxed(bam_addr(bdev, 0, BAM_REVISION));
bdev->num_ees = (val >> NUM_EES_SHIFT) & NUM_EES_MASK;
}
/* check that configured EE is within range */
if (bdev->ee >= bdev->num_ees)
return -EINVAL;
if (!bdev->num_channels) {
val = readl_relaxed(bam_addr(bdev, 0, BAM_NUM_PIPES));
bdev->num_channels = val & BAM_NUM_PIPES_MASK;
}
/* Reset BAM now if fully controlled locally */
if (!bdev->controlled_remotely && !bdev->powered_remotely)
bam_reset(bdev);
return 0;
}
static void bam_channel_init(struct bam_device *bdev, struct bam_chan *bchan,
u32 index)
{
bchan->id = index;
bchan->bdev = bdev;
vchan_init(&bchan->vc, &bdev->common);
bchan->vc.desc_free = bam_dma_free_desc;
INIT_LIST_HEAD(&bchan->desc_list);
}
static const struct of_device_id bam_of_match[] = {
{ .compatible = "qcom,bam-v1.3.0", .data = &bam_v1_3_reg_info },
{ .compatible = "qcom,bam-v1.4.0", .data = &bam_v1_4_reg_info },
{ .compatible = "qcom,bam-v1.7.0", .data = &bam_v1_7_reg_info },
{}
};
MODULE_DEVICE_TABLE(of, bam_of_match);
static int bam_dma_probe(struct platform_device *pdev)
{
struct bam_device *bdev;
const struct of_device_id *match;
int ret, i;
bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL);
if (!bdev)
return -ENOMEM;
bdev->dev = &pdev->dev;
match = of_match_node(bam_of_match, pdev->dev.of_node);
if (!match) {
dev_err(&pdev->dev, "Unsupported BAM module\n");
return -ENODEV;
}
bdev->layout = match->data;
bdev->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(bdev->regs))
return PTR_ERR(bdev->regs);
bdev->irq = platform_get_irq(pdev, 0);
if (bdev->irq < 0)
return bdev->irq;
ret = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &bdev->ee);
if (ret) {
dev_err(bdev->dev, "Execution environment unspecified\n");
return ret;
}
bdev->controlled_remotely = of_property_read_bool(pdev->dev.of_node,
"qcom,controlled-remotely");
bdev->powered_remotely = of_property_read_bool(pdev->dev.of_node,
"qcom,powered-remotely");
if (bdev->controlled_remotely || bdev->powered_remotely)
bdev->bamclk = devm_clk_get_optional(bdev->dev, "bam_clk");
else
bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");
if (IS_ERR(bdev->bamclk))
return PTR_ERR(bdev->bamclk);
if (!bdev->bamclk) {
ret = of_property_read_u32(pdev->dev.of_node, "num-channels",
&bdev->num_channels);
if (ret)
dev_err(bdev->dev, "num-channels unspecified in dt\n");
ret = of_property_read_u32(pdev->dev.of_node, "qcom,num-ees",
&bdev->num_ees);
if (ret)
dev_err(bdev->dev, "num-ees unspecified in dt\n");
}
ret = clk_prepare_enable(bdev->bamclk);
if (ret) {
dev_err(bdev->dev, "failed to prepare/enable clock\n");
return ret;
}
ret = bam_init(bdev);
if (ret)
goto err_disable_clk;
tasklet_setup(&bdev->task, dma_tasklet);
bdev->channels = devm_kcalloc(bdev->dev, bdev->num_channels,
sizeof(*bdev->channels), GFP_KERNEL);
if (!bdev->channels) {
ret = -ENOMEM;
goto err_tasklet_kill;
}
/* allocate and initialize channels */
INIT_LIST_HEAD(&bdev->common.channels);
for (i = 0; i < bdev->num_channels; i++)
bam_channel_init(bdev, &bdev->channels[i], i);
ret = devm_request_irq(bdev->dev, bdev->irq, bam_dma_irq,
IRQF_TRIGGER_HIGH, "bam_dma", bdev);
if (ret)
goto err_bam_channel_exit;
/* set max dma segment size */
bdev->common.dev = bdev->dev;
ret = dma_set_max_seg_size(bdev->common.dev, BAM_FIFO_SIZE);
if (ret) {
dev_err(bdev->dev, "cannot set maximum segment size\n");
goto err_bam_channel_exit;
}
platform_set_drvdata(pdev, bdev);
/* set capabilities */
dma_cap_zero(bdev->common.cap_mask);
dma_cap_set(DMA_SLAVE, bdev->common.cap_mask);
/* initialize dmaengine apis */
bdev->common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
bdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
bdev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
bdev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
bdev->common.device_alloc_chan_resources = bam_alloc_chan;
bdev->common.device_free_chan_resources = bam_free_chan;
bdev->common.device_prep_slave_sg = bam_prep_slave_sg;
bdev->common.device_config = bam_slave_config;
bdev->common.device_pause = bam_pause;
bdev->common.device_resume = bam_resume;
bdev->common.device_terminate_all = bam_dma_terminate_all;
bdev->common.device_issue_pending = bam_issue_pending;
bdev->common.device_tx_status = bam_tx_status;
bdev->common.dev = bdev->dev;
ret = dma_async_device_register(&bdev->common);
if (ret) {
dev_err(bdev->dev, "failed to register dma async device\n");
goto err_bam_channel_exit;
}
ret = of_dma_controller_register(pdev->dev.of_node, bam_dma_xlate,
&bdev->common);
if (ret)
goto err_unregister_dma;
pm_runtime_irq_safe(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, BAM_DMA_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
err_unregister_dma:
dma_async_device_unregister(&bdev->common);
err_bam_channel_exit:
for (i = 0; i < bdev->num_channels; i++)
tasklet_kill(&bdev->channels[i].vc.task);
err_tasklet_kill:
tasklet_kill(&bdev->task);
err_disable_clk:
clk_disable_unprepare(bdev->bamclk);
return ret;
}
static int bam_dma_remove(struct platform_device *pdev)
{
struct bam_device *bdev = platform_get_drvdata(pdev);
u32 i;
pm_runtime_force_suspend(&pdev->dev);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&bdev->common);
/* mask all interrupts for this execution environment */
writel_relaxed(0, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE));
devm_free_irq(bdev->dev, bdev->irq, bdev);
for (i = 0; i < bdev->num_channels; i++) {
bam_dma_terminate_all(&bdev->channels[i].vc.chan);
tasklet_kill(&bdev->channels[i].vc.task);
if (!bdev->channels[i].fifo_virt)
continue;
dma_free_wc(bdev->dev, BAM_DESC_FIFO_SIZE,
bdev->channels[i].fifo_virt,
bdev->channels[i].fifo_phys);
}
tasklet_kill(&bdev->task);
clk_disable_unprepare(bdev->bamclk);
return 0;
}
static int __maybe_unused bam_dma_runtime_suspend(struct device *dev)
{
struct bam_device *bdev = dev_get_drvdata(dev);
clk_disable(bdev->bamclk);
return 0;
}
static int __maybe_unused bam_dma_runtime_resume(struct device *dev)
{
struct bam_device *bdev = dev_get_drvdata(dev);
int ret;
ret = clk_enable(bdev->bamclk);
if (ret < 0) {
dev_err(dev, "clk_enable failed: %d\n", ret);
return ret;
}
return 0;
}
static int __maybe_unused bam_dma_suspend(struct device *dev)
{
struct bam_device *bdev = dev_get_drvdata(dev);
pm_runtime_force_suspend(dev);
clk_unprepare(bdev->bamclk);
return 0;
}
static int __maybe_unused bam_dma_resume(struct device *dev)
{
struct bam_device *bdev = dev_get_drvdata(dev);
int ret;
ret = clk_prepare(bdev->bamclk);
if (ret)
return ret;
pm_runtime_force_resume(dev);
return 0;
}
static const struct dev_pm_ops bam_dma_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(bam_dma_suspend, bam_dma_resume)
SET_RUNTIME_PM_OPS(bam_dma_runtime_suspend, bam_dma_runtime_resume,
NULL)
};
static struct platform_driver bam_dma_driver = {
.probe = bam_dma_probe,
.remove = bam_dma_remove,
.driver = {
.name = "bam-dma-engine",
.pm = &bam_dma_pm_ops,
.of_match_table = bam_of_match,
},
};
module_platform_driver(bam_dma_driver);
MODULE_AUTHOR("Andy Gross <[email protected]>");
MODULE_DESCRIPTION("QCOM BAM DMA engine driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/qcom/bam_dma.c |
/*
* Qualcomm Technologies HIDMA DMA engine interface
*
* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* Copyright (C) Freescale Semicondutor, Inc. 2007, 2008.
* Copyright (C) Semihalf 2009
* Copyright (C) Ilya Yanok, Emcraft Systems 2010
* Copyright (C) Alexander Popov, Promcontroller 2014
*
* Written by Piotr Ziecik <[email protected]>. Hardware description
* (defines, structures and comments) was taken from MPC5121 DMA driver
* written by Hongjun Chen <[email protected]>.
*
* Approved as OSADL project by a majority of OSADL members and funded
* by OSADL membership fees in 2009; for details see www.osadl.org.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* The full GNU General Public License is included in this distribution in the
* file called COPYING.
*/
/* Linux Foundation elects GPLv2 license only. */
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/list.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/of_dma.h>
#include <linux/property.h>
#include <linux/delay.h>
#include <linux/acpi.h>
#include <linux/irq.h>
#include <linux/atomic.h>
#include <linux/pm_runtime.h>
#include <linux/msi.h>
#include "../dmaengine.h"
#include "hidma.h"
/*
* Default idle time is 2 seconds. This parameter can
* be overridden by changing the following
* /sys/bus/platform/devices/QCOM8061:<xy>/power/autosuspend_delay_ms
* during kernel boot.
*/
#define HIDMA_AUTOSUSPEND_TIMEOUT 2000
#define HIDMA_ERR_INFO_SW 0xFF
#define HIDMA_ERR_CODE_UNEXPECTED_TERMINATE 0x0
#define HIDMA_NR_DEFAULT_DESC 10
#define HIDMA_MSI_INTS 11
static inline struct hidma_dev *to_hidma_dev(struct dma_device *dmadev)
{
return container_of(dmadev, struct hidma_dev, ddev);
}
static inline
struct hidma_dev *to_hidma_dev_from_lldev(struct hidma_lldev **_lldevp)
{
return container_of(_lldevp, struct hidma_dev, lldev);
}
static inline struct hidma_chan *to_hidma_chan(struct dma_chan *dmach)
{
return container_of(dmach, struct hidma_chan, chan);
}
static void hidma_free(struct hidma_dev *dmadev)
{
INIT_LIST_HEAD(&dmadev->ddev.channels);
}
static unsigned int nr_desc_prm;
module_param(nr_desc_prm, uint, 0644);
MODULE_PARM_DESC(nr_desc_prm, "number of descriptors (default: 0)");
enum hidma_cap {
HIDMA_MSI_CAP = 1,
HIDMA_IDENTITY_CAP,
};
/* process completed descriptors */
static void hidma_process_completed(struct hidma_chan *mchan)
{
struct dma_device *ddev = mchan->chan.device;
struct hidma_dev *mdma = to_hidma_dev(ddev);
struct dma_async_tx_descriptor *desc;
dma_cookie_t last_cookie;
struct hidma_desc *mdesc;
struct hidma_desc *next;
unsigned long irqflags;
struct list_head list;
INIT_LIST_HEAD(&list);
/* Get all completed descriptors */
spin_lock_irqsave(&mchan->lock, irqflags);
list_splice_tail_init(&mchan->completed, &list);
spin_unlock_irqrestore(&mchan->lock, irqflags);
/* Execute callbacks and run dependencies */
list_for_each_entry_safe(mdesc, next, &list, node) {
enum dma_status llstat;
struct dmaengine_desc_callback cb;
struct dmaengine_result result;
desc = &mdesc->desc;
last_cookie = desc->cookie;
llstat = hidma_ll_status(mdma->lldev, mdesc->tre_ch);
spin_lock_irqsave(&mchan->lock, irqflags);
if (llstat == DMA_COMPLETE) {
mchan->last_success = last_cookie;
result.result = DMA_TRANS_NOERROR;
} else {
result.result = DMA_TRANS_ABORTED;
}
dma_cookie_complete(desc);
spin_unlock_irqrestore(&mchan->lock, irqflags);
dmaengine_desc_get_callback(desc, &cb);
dma_run_dependencies(desc);
spin_lock_irqsave(&mchan->lock, irqflags);
list_move(&mdesc->node, &mchan->free);
spin_unlock_irqrestore(&mchan->lock, irqflags);
dmaengine_desc_callback_invoke(&cb, &result);
}
}
/*
* Called once for each submitted descriptor.
* PM is locked once for each descriptor that is currently
* in execution.
*/
static void hidma_callback(void *data)
{
struct hidma_desc *mdesc = data;
struct hidma_chan *mchan = to_hidma_chan(mdesc->desc.chan);
struct dma_device *ddev = mchan->chan.device;
struct hidma_dev *dmadev = to_hidma_dev(ddev);
unsigned long irqflags;
bool queued = false;
spin_lock_irqsave(&mchan->lock, irqflags);
if (mdesc->node.next) {
/* Delete from the active list, add to completed list */
list_move_tail(&mdesc->node, &mchan->completed);
queued = true;
/* calculate the next running descriptor */
mchan->running = list_first_entry(&mchan->active,
struct hidma_desc, node);
}
spin_unlock_irqrestore(&mchan->lock, irqflags);
hidma_process_completed(mchan);
if (queued) {
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
}
}
static int hidma_chan_init(struct hidma_dev *dmadev, u32 dma_sig)
{
struct hidma_chan *mchan;
struct dma_device *ddev;
mchan = devm_kzalloc(dmadev->ddev.dev, sizeof(*mchan), GFP_KERNEL);
if (!mchan)
return -ENOMEM;
ddev = &dmadev->ddev;
mchan->dma_sig = dma_sig;
mchan->dmadev = dmadev;
mchan->chan.device = ddev;
dma_cookie_init(&mchan->chan);
INIT_LIST_HEAD(&mchan->free);
INIT_LIST_HEAD(&mchan->prepared);
INIT_LIST_HEAD(&mchan->active);
INIT_LIST_HEAD(&mchan->completed);
INIT_LIST_HEAD(&mchan->queued);
spin_lock_init(&mchan->lock);
list_add_tail(&mchan->chan.device_node, &ddev->channels);
return 0;
}
static void hidma_issue_task(struct tasklet_struct *t)
{
struct hidma_dev *dmadev = from_tasklet(dmadev, t, task);
pm_runtime_get_sync(dmadev->ddev.dev);
hidma_ll_start(dmadev->lldev);
}
static void hidma_issue_pending(struct dma_chan *dmach)
{
struct hidma_chan *mchan = to_hidma_chan(dmach);
struct hidma_dev *dmadev = mchan->dmadev;
unsigned long flags;
struct hidma_desc *qdesc, *next;
int status;
spin_lock_irqsave(&mchan->lock, flags);
list_for_each_entry_safe(qdesc, next, &mchan->queued, node) {
hidma_ll_queue_request(dmadev->lldev, qdesc->tre_ch);
list_move_tail(&qdesc->node, &mchan->active);
}
if (!mchan->running) {
struct hidma_desc *desc = list_first_entry(&mchan->active,
struct hidma_desc,
node);
mchan->running = desc;
}
spin_unlock_irqrestore(&mchan->lock, flags);
/* PM will be released in hidma_callback function. */
status = pm_runtime_get(dmadev->ddev.dev);
if (status < 0)
tasklet_schedule(&dmadev->task);
else
hidma_ll_start(dmadev->lldev);
}
static inline bool hidma_txn_is_success(dma_cookie_t cookie,
dma_cookie_t last_success, dma_cookie_t last_used)
{
if (last_success <= last_used) {
if ((cookie <= last_success) || (cookie > last_used))
return true;
} else {
if ((cookie <= last_success) && (cookie > last_used))
return true;
}
return false;
}
static enum dma_status hidma_tx_status(struct dma_chan *dmach,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
struct hidma_chan *mchan = to_hidma_chan(dmach);
enum dma_status ret;
ret = dma_cookie_status(dmach, cookie, txstate);
if (ret == DMA_COMPLETE) {
bool is_success;
is_success = hidma_txn_is_success(cookie, mchan->last_success,
dmach->cookie);
return is_success ? ret : DMA_ERROR;
}
if (mchan->paused && (ret == DMA_IN_PROGRESS)) {
unsigned long flags;
dma_cookie_t runcookie;
spin_lock_irqsave(&mchan->lock, flags);
if (mchan->running)
runcookie = mchan->running->desc.cookie;
else
runcookie = -EINVAL;
if (runcookie == cookie)
ret = DMA_PAUSED;
spin_unlock_irqrestore(&mchan->lock, flags);
}
return ret;
}
/*
* Submit descriptor to hardware.
* Lock the PM for each descriptor we are sending.
*/
static dma_cookie_t hidma_tx_submit(struct dma_async_tx_descriptor *txd)
{
struct hidma_chan *mchan = to_hidma_chan(txd->chan);
struct hidma_dev *dmadev = mchan->dmadev;
struct hidma_desc *mdesc;
unsigned long irqflags;
dma_cookie_t cookie;
pm_runtime_get_sync(dmadev->ddev.dev);
if (!hidma_ll_isenabled(dmadev->lldev)) {
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
return -ENODEV;
}
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
mdesc = container_of(txd, struct hidma_desc, desc);
spin_lock_irqsave(&mchan->lock, irqflags);
/* Move descriptor to queued */
list_move_tail(&mdesc->node, &mchan->queued);
/* Update cookie */
cookie = dma_cookie_assign(txd);
spin_unlock_irqrestore(&mchan->lock, irqflags);
return cookie;
}
static int hidma_alloc_chan_resources(struct dma_chan *dmach)
{
struct hidma_chan *mchan = to_hidma_chan(dmach);
struct hidma_dev *dmadev = mchan->dmadev;
struct hidma_desc *mdesc, *tmp;
unsigned long irqflags;
LIST_HEAD(descs);
unsigned int i;
int rc = 0;
if (mchan->allocated)
return 0;
/* Alloc descriptors for this channel */
for (i = 0; i < dmadev->nr_descriptors; i++) {
mdesc = kzalloc(sizeof(struct hidma_desc), GFP_NOWAIT);
if (!mdesc) {
rc = -ENOMEM;
break;
}
dma_async_tx_descriptor_init(&mdesc->desc, dmach);
mdesc->desc.tx_submit = hidma_tx_submit;
rc = hidma_ll_request(dmadev->lldev, mchan->dma_sig,
"DMA engine", hidma_callback, mdesc,
&mdesc->tre_ch);
if (rc) {
dev_err(dmach->device->dev,
"channel alloc failed at %u\n", i);
kfree(mdesc);
break;
}
list_add_tail(&mdesc->node, &descs);
}
if (rc) {
/* return the allocated descriptors */
list_for_each_entry_safe(mdesc, tmp, &descs, node) {
hidma_ll_free(dmadev->lldev, mdesc->tre_ch);
kfree(mdesc);
}
return rc;
}
spin_lock_irqsave(&mchan->lock, irqflags);
list_splice_tail_init(&descs, &mchan->free);
mchan->allocated = true;
spin_unlock_irqrestore(&mchan->lock, irqflags);
return 1;
}
static struct dma_async_tx_descriptor *
hidma_prep_dma_memcpy(struct dma_chan *dmach, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct hidma_chan *mchan = to_hidma_chan(dmach);
struct hidma_desc *mdesc = NULL;
struct hidma_dev *mdma = mchan->dmadev;
unsigned long irqflags;
/* Get free descriptor */
spin_lock_irqsave(&mchan->lock, irqflags);
if (!list_empty(&mchan->free)) {
mdesc = list_first_entry(&mchan->free, struct hidma_desc, node);
list_del(&mdesc->node);
}
spin_unlock_irqrestore(&mchan->lock, irqflags);
if (!mdesc)
return NULL;
mdesc->desc.flags = flags;
hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
src, dest, len, flags,
HIDMA_TRE_MEMCPY);
/* Place descriptor in prepared list */
spin_lock_irqsave(&mchan->lock, irqflags);
list_add_tail(&mdesc->node, &mchan->prepared);
spin_unlock_irqrestore(&mchan->lock, irqflags);
return &mdesc->desc;
}
static struct dma_async_tx_descriptor *
hidma_prep_dma_memset(struct dma_chan *dmach, dma_addr_t dest, int value,
size_t len, unsigned long flags)
{
struct hidma_chan *mchan = to_hidma_chan(dmach);
struct hidma_desc *mdesc = NULL;
struct hidma_dev *mdma = mchan->dmadev;
unsigned long irqflags;
u64 byte_pattern, fill_pattern;
/* Get free descriptor */
spin_lock_irqsave(&mchan->lock, irqflags);
if (!list_empty(&mchan->free)) {
mdesc = list_first_entry(&mchan->free, struct hidma_desc, node);
list_del(&mdesc->node);
}
spin_unlock_irqrestore(&mchan->lock, irqflags);
if (!mdesc)
return NULL;
byte_pattern = (char)value;
fill_pattern = (byte_pattern << 56) |
(byte_pattern << 48) |
(byte_pattern << 40) |
(byte_pattern << 32) |
(byte_pattern << 24) |
(byte_pattern << 16) |
(byte_pattern << 8) |
byte_pattern;
mdesc->desc.flags = flags;
hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
fill_pattern, dest, len, flags,
HIDMA_TRE_MEMSET);
/* Place descriptor in prepared list */
spin_lock_irqsave(&mchan->lock, irqflags);
list_add_tail(&mdesc->node, &mchan->prepared);
spin_unlock_irqrestore(&mchan->lock, irqflags);
return &mdesc->desc;
}
static int hidma_terminate_channel(struct dma_chan *chan)
{
struct hidma_chan *mchan = to_hidma_chan(chan);
struct hidma_dev *dmadev = to_hidma_dev(mchan->chan.device);
struct hidma_desc *tmp, *mdesc;
unsigned long irqflags;
LIST_HEAD(list);
int rc;
pm_runtime_get_sync(dmadev->ddev.dev);
/* give completed requests a chance to finish */
hidma_process_completed(mchan);
spin_lock_irqsave(&mchan->lock, irqflags);
mchan->last_success = 0;
list_splice_init(&mchan->active, &list);
list_splice_init(&mchan->prepared, &list);
list_splice_init(&mchan->completed, &list);
list_splice_init(&mchan->queued, &list);
spin_unlock_irqrestore(&mchan->lock, irqflags);
/* this suspends the existing transfer */
rc = hidma_ll_disable(dmadev->lldev);
if (rc) {
dev_err(dmadev->ddev.dev, "channel did not pause\n");
goto out;
}
/* return all user requests */
list_for_each_entry_safe(mdesc, tmp, &list, node) {
struct dma_async_tx_descriptor *txd = &mdesc->desc;
dma_descriptor_unmap(txd);
dmaengine_desc_get_callback_invoke(txd, NULL);
dma_run_dependencies(txd);
/* move myself to free_list */
list_move(&mdesc->node, &mchan->free);
}
rc = hidma_ll_enable(dmadev->lldev);
out:
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
return rc;
}
static int hidma_terminate_all(struct dma_chan *chan)
{
struct hidma_chan *mchan = to_hidma_chan(chan);
struct hidma_dev *dmadev = to_hidma_dev(mchan->chan.device);
int rc;
rc = hidma_terminate_channel(chan);
if (rc)
return rc;
/* reinitialize the hardware */
pm_runtime_get_sync(dmadev->ddev.dev);
rc = hidma_ll_setup(dmadev->lldev);
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
return rc;
}
static void hidma_free_chan_resources(struct dma_chan *dmach)
{
struct hidma_chan *mchan = to_hidma_chan(dmach);
struct hidma_dev *mdma = mchan->dmadev;
struct hidma_desc *mdesc, *tmp;
unsigned long irqflags;
LIST_HEAD(descs);
/* terminate running transactions and free descriptors */
hidma_terminate_channel(dmach);
spin_lock_irqsave(&mchan->lock, irqflags);
/* Move data */
list_splice_tail_init(&mchan->free, &descs);
/* Free descriptors */
list_for_each_entry_safe(mdesc, tmp, &descs, node) {
hidma_ll_free(mdma->lldev, mdesc->tre_ch);
list_del(&mdesc->node);
kfree(mdesc);
}
mchan->allocated = false;
spin_unlock_irqrestore(&mchan->lock, irqflags);
}
static int hidma_pause(struct dma_chan *chan)
{
struct hidma_chan *mchan;
struct hidma_dev *dmadev;
mchan = to_hidma_chan(chan);
dmadev = to_hidma_dev(mchan->chan.device);
if (!mchan->paused) {
pm_runtime_get_sync(dmadev->ddev.dev);
if (hidma_ll_disable(dmadev->lldev))
dev_warn(dmadev->ddev.dev, "channel did not stop\n");
mchan->paused = true;
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
}
return 0;
}
static int hidma_resume(struct dma_chan *chan)
{
struct hidma_chan *mchan;
struct hidma_dev *dmadev;
int rc = 0;
mchan = to_hidma_chan(chan);
dmadev = to_hidma_dev(mchan->chan.device);
if (mchan->paused) {
pm_runtime_get_sync(dmadev->ddev.dev);
rc = hidma_ll_enable(dmadev->lldev);
if (!rc)
mchan->paused = false;
else
dev_err(dmadev->ddev.dev,
"failed to resume the channel");
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
}
return rc;
}
static irqreturn_t hidma_chirq_handler(int chirq, void *arg)
{
struct hidma_lldev *lldev = arg;
/*
* All interrupts are request driven.
* HW doesn't send an interrupt by itself.
*/
return hidma_ll_inthandler(chirq, lldev);
}
#ifdef CONFIG_GENERIC_MSI_IRQ
static irqreturn_t hidma_chirq_handler_msi(int chirq, void *arg)
{
struct hidma_lldev **lldevp = arg;
struct hidma_dev *dmadev = to_hidma_dev_from_lldev(lldevp);
return hidma_ll_inthandler_msi(chirq, *lldevp,
1 << (chirq - dmadev->msi_virqbase));
}
#endif
static ssize_t hidma_show_values(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hidma_dev *mdev = dev_get_drvdata(dev);
buf[0] = 0;
if (strcmp(attr->attr.name, "chid") == 0)
sprintf(buf, "%d\n", mdev->chidx);
return strlen(buf);
}
static inline void hidma_sysfs_uninit(struct hidma_dev *dev)
{
device_remove_file(dev->ddev.dev, dev->chid_attrs);
}
static struct device_attribute*
hidma_create_sysfs_entry(struct hidma_dev *dev, char *name, int mode)
{
struct device_attribute *attrs;
char *name_copy;
attrs = devm_kmalloc(dev->ddev.dev, sizeof(struct device_attribute),
GFP_KERNEL);
if (!attrs)
return NULL;
name_copy = devm_kstrdup(dev->ddev.dev, name, GFP_KERNEL);
if (!name_copy)
return NULL;
attrs->attr.name = name_copy;
attrs->attr.mode = mode;
attrs->show = hidma_show_values;
sysfs_attr_init(&attrs->attr);
return attrs;
}
static int hidma_sysfs_init(struct hidma_dev *dev)
{
dev->chid_attrs = hidma_create_sysfs_entry(dev, "chid", S_IRUGO);
if (!dev->chid_attrs)
return -ENOMEM;
return device_create_file(dev->ddev.dev, dev->chid_attrs);
}
#ifdef CONFIG_GENERIC_MSI_IRQ
static void hidma_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
{
struct device *dev = msi_desc_to_dev(desc);
struct hidma_dev *dmadev = dev_get_drvdata(dev);
if (!desc->msi_index) {
writel(msg->address_lo, dmadev->dev_evca + 0x118);
writel(msg->address_hi, dmadev->dev_evca + 0x11C);
writel(msg->data, dmadev->dev_evca + 0x120);
}
}
#endif
static void hidma_free_msis(struct hidma_dev *dmadev)
{
#ifdef CONFIG_GENERIC_MSI_IRQ
struct device *dev = dmadev->ddev.dev;
int i, virq;
for (i = 0; i < HIDMA_MSI_INTS; i++) {
virq = msi_get_virq(dev, i);
if (virq)
devm_free_irq(dev, virq, &dmadev->lldev);
}
platform_msi_domain_free_irqs(dev);
#endif
}
static int hidma_request_msi(struct hidma_dev *dmadev,
struct platform_device *pdev)
{
#ifdef CONFIG_GENERIC_MSI_IRQ
int rc, i, virq;
rc = platform_msi_domain_alloc_irqs(&pdev->dev, HIDMA_MSI_INTS,
hidma_write_msi_msg);
if (rc)
return rc;
for (i = 0; i < HIDMA_MSI_INTS; i++) {
virq = msi_get_virq(&pdev->dev, i);
rc = devm_request_irq(&pdev->dev, virq,
hidma_chirq_handler_msi,
0, "qcom-hidma-msi",
&dmadev->lldev);
if (rc)
break;
if (!i)
dmadev->msi_virqbase = virq;
}
if (rc) {
/* free allocated MSI interrupts above */
for (--i; i >= 0; i--) {
virq = msi_get_virq(&pdev->dev, i);
devm_free_irq(&pdev->dev, virq, &dmadev->lldev);
}
dev_warn(&pdev->dev,
"failed to request MSI irq, falling back to wired IRQ\n");
} else {
/* Add callback to free MSIs on teardown */
hidma_ll_setup_irq(dmadev->lldev, true);
}
return rc;
#else
return -EINVAL;
#endif
}
static bool hidma_test_capability(struct device *dev, enum hidma_cap test_cap)
{
enum hidma_cap cap;
cap = (enum hidma_cap) device_get_match_data(dev);
return cap ? ((cap & test_cap) > 0) : 0;
}
static int hidma_probe(struct platform_device *pdev)
{
struct hidma_dev *dmadev;
struct resource *trca_resource;
struct resource *evca_resource;
int chirq;
void __iomem *evca;
void __iomem *trca;
int rc;
bool msi;
pm_runtime_set_autosuspend_delay(&pdev->dev, HIDMA_AUTOSUSPEND_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
trca = devm_platform_get_and_ioremap_resource(pdev, 0, &trca_resource);
if (IS_ERR(trca)) {
rc = PTR_ERR(trca);
goto bailout;
}
evca = devm_platform_get_and_ioremap_resource(pdev, 1, &evca_resource);
if (IS_ERR(evca)) {
rc = PTR_ERR(evca);
goto bailout;
}
/*
* This driver only handles the channel IRQs.
* Common IRQ is handled by the management driver.
*/
chirq = platform_get_irq(pdev, 0);
if (chirq < 0) {
rc = chirq;
goto bailout;
}
dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
if (!dmadev) {
rc = -ENOMEM;
goto bailout;
}
INIT_LIST_HEAD(&dmadev->ddev.channels);
spin_lock_init(&dmadev->lock);
dmadev->ddev.dev = &pdev->dev;
pm_runtime_get_sync(dmadev->ddev.dev);
dma_cap_set(DMA_MEMCPY, dmadev->ddev.cap_mask);
dma_cap_set(DMA_MEMSET, dmadev->ddev.cap_mask);
if (WARN_ON(!pdev->dev.dma_mask)) {
rc = -ENXIO;
goto dmafree;
}
dmadev->dev_evca = evca;
dmadev->evca_resource = evca_resource;
dmadev->dev_trca = trca;
dmadev->trca_resource = trca_resource;
dmadev->ddev.device_prep_dma_memcpy = hidma_prep_dma_memcpy;
dmadev->ddev.device_prep_dma_memset = hidma_prep_dma_memset;
dmadev->ddev.device_alloc_chan_resources = hidma_alloc_chan_resources;
dmadev->ddev.device_free_chan_resources = hidma_free_chan_resources;
dmadev->ddev.device_tx_status = hidma_tx_status;
dmadev->ddev.device_issue_pending = hidma_issue_pending;
dmadev->ddev.device_pause = hidma_pause;
dmadev->ddev.device_resume = hidma_resume;
dmadev->ddev.device_terminate_all = hidma_terminate_all;
dmadev->ddev.copy_align = 8;
/*
* Determine the MSI capability of the platform. Old HW doesn't
* support MSI.
*/
msi = hidma_test_capability(&pdev->dev, HIDMA_MSI_CAP);
device_property_read_u32(&pdev->dev, "desc-count",
&dmadev->nr_descriptors);
if (nr_desc_prm) {
dev_info(&pdev->dev, "overriding number of descriptors as %d\n",
nr_desc_prm);
dmadev->nr_descriptors = nr_desc_prm;
}
if (!dmadev->nr_descriptors)
dmadev->nr_descriptors = HIDMA_NR_DEFAULT_DESC;
if (hidma_test_capability(&pdev->dev, HIDMA_IDENTITY_CAP))
dmadev->chidx = readl(dmadev->dev_trca + 0x40);
else
dmadev->chidx = readl(dmadev->dev_trca + 0x28);
/* Set DMA mask to 64 bits. */
rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (rc) {
dev_warn(&pdev->dev, "unable to set coherent mask to 64");
goto dmafree;
}
dmadev->lldev = hidma_ll_init(dmadev->ddev.dev,
dmadev->nr_descriptors, dmadev->dev_trca,
dmadev->dev_evca, dmadev->chidx);
if (!dmadev->lldev) {
rc = -EPROBE_DEFER;
goto dmafree;
}
platform_set_drvdata(pdev, dmadev);
if (msi)
rc = hidma_request_msi(dmadev, pdev);
if (!msi || rc) {
hidma_ll_setup_irq(dmadev->lldev, false);
rc = devm_request_irq(&pdev->dev, chirq, hidma_chirq_handler,
0, "qcom-hidma", dmadev->lldev);
if (rc)
goto uninit;
}
INIT_LIST_HEAD(&dmadev->ddev.channels);
rc = hidma_chan_init(dmadev, 0);
if (rc)
goto uninit;
rc = dma_async_device_register(&dmadev->ddev);
if (rc)
goto uninit;
dmadev->irq = chirq;
tasklet_setup(&dmadev->task, hidma_issue_task);
hidma_debug_init(dmadev);
hidma_sysfs_init(dmadev);
dev_info(&pdev->dev, "HI-DMA engine driver registration complete\n");
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
return 0;
uninit:
if (msi)
hidma_free_msis(dmadev);
hidma_ll_uninit(dmadev->lldev);
dmafree:
if (dmadev)
hidma_free(dmadev);
bailout:
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return rc;
}
static void hidma_shutdown(struct platform_device *pdev)
{
struct hidma_dev *dmadev = platform_get_drvdata(pdev);
dev_info(dmadev->ddev.dev, "HI-DMA engine shutdown\n");
pm_runtime_get_sync(dmadev->ddev.dev);
if (hidma_ll_disable(dmadev->lldev))
dev_warn(dmadev->ddev.dev, "channel did not stop\n");
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
}
static int hidma_remove(struct platform_device *pdev)
{
struct hidma_dev *dmadev = platform_get_drvdata(pdev);
pm_runtime_get_sync(dmadev->ddev.dev);
dma_async_device_unregister(&dmadev->ddev);
if (!dmadev->lldev->msi_support)
devm_free_irq(dmadev->ddev.dev, dmadev->irq, dmadev->lldev);
else
hidma_free_msis(dmadev);
tasklet_kill(&dmadev->task);
hidma_sysfs_uninit(dmadev);
hidma_debug_uninit(dmadev);
hidma_ll_uninit(dmadev->lldev);
hidma_free(dmadev);
dev_info(&pdev->dev, "HI-DMA engine removed\n");
pm_runtime_put_sync_suspend(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
#if IS_ENABLED(CONFIG_ACPI)
static const struct acpi_device_id hidma_acpi_ids[] = {
{"QCOM8061"},
{"QCOM8062", HIDMA_MSI_CAP},
{"QCOM8063", (HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP)},
{},
};
MODULE_DEVICE_TABLE(acpi, hidma_acpi_ids);
#endif
static const struct of_device_id hidma_match[] = {
{.compatible = "qcom,hidma-1.0",},
{.compatible = "qcom,hidma-1.1", .data = (void *)(HIDMA_MSI_CAP),},
{.compatible = "qcom,hidma-1.2",
.data = (void *)(HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP),},
{},
};
MODULE_DEVICE_TABLE(of, hidma_match);
static struct platform_driver hidma_driver = {
.probe = hidma_probe,
.remove = hidma_remove,
.shutdown = hidma_shutdown,
.driver = {
.name = "hidma",
.of_match_table = hidma_match,
.acpi_match_table = ACPI_PTR(hidma_acpi_ids),
},
};
module_platform_driver(hidma_driver);
MODULE_LICENSE("GPL v2");
| linux-master | drivers/dma/qcom/hidma.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Qualcomm Technologies HIDMA Management SYS interface
*
* Copyright (c) 2015, The Linux Foundation. All rights reserved.
*/
#include <linux/sysfs.h>
#include <linux/platform_device.h>
#include "hidma_mgmt.h"
struct hidma_chan_attr {
struct hidma_mgmt_dev *mdev;
int index;
struct kobj_attribute attr;
};
struct hidma_mgmt_fileinfo {
char *name;
int mode;
int (*get)(struct hidma_mgmt_dev *mdev);
int (*set)(struct hidma_mgmt_dev *mdev, u64 val);
};
#define IMPLEMENT_GETSET(name) \
static int get_##name(struct hidma_mgmt_dev *mdev) \
{ \
return mdev->name; \
} \
static int set_##name(struct hidma_mgmt_dev *mdev, u64 val) \
{ \
u64 tmp; \
int rc; \
\
tmp = mdev->name; \
mdev->name = val; \
rc = hidma_mgmt_setup(mdev); \
if (rc) \
mdev->name = tmp; \
return rc; \
}
#define DECLARE_ATTRIBUTE(name, mode) \
{#name, mode, get_##name, set_##name}
IMPLEMENT_GETSET(hw_version_major)
IMPLEMENT_GETSET(hw_version_minor)
IMPLEMENT_GETSET(max_wr_xactions)
IMPLEMENT_GETSET(max_rd_xactions)
IMPLEMENT_GETSET(max_write_request)
IMPLEMENT_GETSET(max_read_request)
IMPLEMENT_GETSET(dma_channels)
IMPLEMENT_GETSET(chreset_timeout_cycles)
static int set_priority(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val)
{
u64 tmp;
int rc;
if (i >= mdev->dma_channels)
return -EINVAL;
tmp = mdev->priority[i];
mdev->priority[i] = val;
rc = hidma_mgmt_setup(mdev);
if (rc)
mdev->priority[i] = tmp;
return rc;
}
static int set_weight(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val)
{
u64 tmp;
int rc;
if (i >= mdev->dma_channels)
return -EINVAL;
tmp = mdev->weight[i];
mdev->weight[i] = val;
rc = hidma_mgmt_setup(mdev);
if (rc)
mdev->weight[i] = tmp;
return rc;
}
static struct hidma_mgmt_fileinfo hidma_mgmt_files[] = {
DECLARE_ATTRIBUTE(hw_version_major, S_IRUGO),
DECLARE_ATTRIBUTE(hw_version_minor, S_IRUGO),
DECLARE_ATTRIBUTE(dma_channels, S_IRUGO),
DECLARE_ATTRIBUTE(chreset_timeout_cycles, S_IRUGO),
DECLARE_ATTRIBUTE(max_wr_xactions, S_IRUGO),
DECLARE_ATTRIBUTE(max_rd_xactions, S_IRUGO),
DECLARE_ATTRIBUTE(max_write_request, S_IRUGO),
DECLARE_ATTRIBUTE(max_read_request, S_IRUGO),
};
static ssize_t show_values(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct hidma_mgmt_dev *mdev = dev_get_drvdata(dev);
unsigned int i;
buf[0] = 0;
for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) {
if (strcmp(attr->attr.name, hidma_mgmt_files[i].name) == 0) {
sprintf(buf, "%d\n", hidma_mgmt_files[i].get(mdev));
break;
}
}
return strlen(buf);
}
static ssize_t set_values(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct hidma_mgmt_dev *mdev = dev_get_drvdata(dev);
unsigned long tmp;
unsigned int i;
int rc;
rc = kstrtoul(buf, 0, &tmp);
if (rc)
return rc;
for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) {
if (strcmp(attr->attr.name, hidma_mgmt_files[i].name) == 0) {
rc = hidma_mgmt_files[i].set(mdev, tmp);
if (rc)
return rc;
break;
}
}
return count;
}
static ssize_t show_values_channel(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct hidma_chan_attr *chattr;
struct hidma_mgmt_dev *mdev;
buf[0] = 0;
chattr = container_of(attr, struct hidma_chan_attr, attr);
mdev = chattr->mdev;
if (strcmp(attr->attr.name, "priority") == 0)
sprintf(buf, "%d\n", mdev->priority[chattr->index]);
else if (strcmp(attr->attr.name, "weight") == 0)
sprintf(buf, "%d\n", mdev->weight[chattr->index]);
return strlen(buf);
}
static ssize_t set_values_channel(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf,
size_t count)
{
struct hidma_chan_attr *chattr;
struct hidma_mgmt_dev *mdev;
unsigned long tmp;
int rc;
chattr = container_of(attr, struct hidma_chan_attr, attr);
mdev = chattr->mdev;
rc = kstrtoul(buf, 0, &tmp);
if (rc)
return rc;
if (strcmp(attr->attr.name, "priority") == 0) {
rc = set_priority(mdev, chattr->index, tmp);
if (rc)
return rc;
} else if (strcmp(attr->attr.name, "weight") == 0) {
rc = set_weight(mdev, chattr->index, tmp);
if (rc)
return rc;
}
return count;
}
static int create_sysfs_entry(struct hidma_mgmt_dev *dev, char *name, int mode)
{
struct device_attribute *attrs;
char *name_copy;
attrs = devm_kmalloc(&dev->pdev->dev,
sizeof(struct device_attribute), GFP_KERNEL);
if (!attrs)
return -ENOMEM;
name_copy = devm_kstrdup(&dev->pdev->dev, name, GFP_KERNEL);
if (!name_copy)
return -ENOMEM;
attrs->attr.name = name_copy;
attrs->attr.mode = mode;
attrs->show = show_values;
attrs->store = set_values;
sysfs_attr_init(&attrs->attr);
return device_create_file(&dev->pdev->dev, attrs);
}
static int create_sysfs_entry_channel(struct hidma_mgmt_dev *mdev, char *name,
int mode, int index,
struct kobject *parent)
{
struct hidma_chan_attr *chattr;
char *name_copy;
chattr = devm_kmalloc(&mdev->pdev->dev, sizeof(*chattr), GFP_KERNEL);
if (!chattr)
return -ENOMEM;
name_copy = devm_kstrdup(&mdev->pdev->dev, name, GFP_KERNEL);
if (!name_copy)
return -ENOMEM;
chattr->mdev = mdev;
chattr->index = index;
chattr->attr.attr.name = name_copy;
chattr->attr.attr.mode = mode;
chattr->attr.show = show_values_channel;
chattr->attr.store = set_values_channel;
sysfs_attr_init(&chattr->attr.attr);
return sysfs_create_file(parent, &chattr->attr.attr);
}
int hidma_mgmt_init_sys(struct hidma_mgmt_dev *mdev)
{
unsigned int i;
int rc;
int required;
struct kobject *chanops;
required = sizeof(*mdev->chroots) * mdev->dma_channels;
mdev->chroots = devm_kmalloc(&mdev->pdev->dev, required, GFP_KERNEL);
if (!mdev->chroots)
return -ENOMEM;
chanops = kobject_create_and_add("chanops", &mdev->pdev->dev.kobj);
if (!chanops)
return -ENOMEM;
/* create each channel directory here */
for (i = 0; i < mdev->dma_channels; i++) {
char name[20];
snprintf(name, sizeof(name), "chan%d", i);
mdev->chroots[i] = kobject_create_and_add(name, chanops);
if (!mdev->chroots[i])
return -ENOMEM;
}
/* populate common parameters */
for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) {
rc = create_sysfs_entry(mdev, hidma_mgmt_files[i].name,
hidma_mgmt_files[i].mode);
if (rc)
return rc;
}
/* populate parameters that are per channel */
for (i = 0; i < mdev->dma_channels; i++) {
rc = create_sysfs_entry_channel(mdev, "priority",
(S_IRUGO | S_IWUGO), i,
mdev->chroots[i]);
if (rc)
return rc;
rc = create_sysfs_entry_channel(mdev, "weight",
(S_IRUGO | S_IWUGO), i,
mdev->chroots[i]);
if (rc)
return rc;
}
return 0;
}
EXPORT_SYMBOL_GPL(hidma_mgmt_init_sys);
| linux-master | drivers/dma/qcom/hidma_mgmt_sys.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates.
* Synopsys DesignWare eDMA v0 core
*
* Author: Gustavo Pimentel <[email protected]>
*/
#include <linux/bitfield.h>
#include <linux/irqreturn.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include "dw-edma-core.h"
#include "dw-edma-v0-core.h"
#include "dw-edma-v0-regs.h"
#include "dw-edma-v0-debugfs.h"
enum dw_edma_control {
DW_EDMA_V0_CB = BIT(0),
DW_EDMA_V0_TCB = BIT(1),
DW_EDMA_V0_LLP = BIT(2),
DW_EDMA_V0_LIE = BIT(3),
DW_EDMA_V0_RIE = BIT(4),
DW_EDMA_V0_CCS = BIT(8),
DW_EDMA_V0_LLE = BIT(9),
};
static inline struct dw_edma_v0_regs __iomem *__dw_regs(struct dw_edma *dw)
{
return dw->chip->reg_base;
}
#define SET_32(dw, name, value) \
writel(value, &(__dw_regs(dw)->name))
#define GET_32(dw, name) \
readl(&(__dw_regs(dw)->name))
#define SET_RW_32(dw, dir, name, value) \
do { \
if ((dir) == EDMA_DIR_WRITE) \
SET_32(dw, wr_##name, value); \
else \
SET_32(dw, rd_##name, value); \
} while (0)
#define GET_RW_32(dw, dir, name) \
((dir) == EDMA_DIR_WRITE \
? GET_32(dw, wr_##name) \
: GET_32(dw, rd_##name))
#define SET_BOTH_32(dw, name, value) \
do { \
SET_32(dw, wr_##name, value); \
SET_32(dw, rd_##name, value); \
} while (0)
#define SET_64(dw, name, value) \
writeq(value, &(__dw_regs(dw)->name))
#define GET_64(dw, name) \
readq(&(__dw_regs(dw)->name))
#define SET_RW_64(dw, dir, name, value) \
do { \
if ((dir) == EDMA_DIR_WRITE) \
SET_64(dw, wr_##name, value); \
else \
SET_64(dw, rd_##name, value); \
} while (0)
#define GET_RW_64(dw, dir, name) \
((dir) == EDMA_DIR_WRITE \
? GET_64(dw, wr_##name) \
: GET_64(dw, rd_##name))
#define SET_BOTH_64(dw, name, value) \
do { \
SET_64(dw, wr_##name, value); \
SET_64(dw, rd_##name, value); \
} while (0)
#define SET_COMPAT(dw, name, value) \
writel(value, &(__dw_regs(dw)->type.unroll.name))
#define SET_RW_COMPAT(dw, dir, name, value) \
do { \
if ((dir) == EDMA_DIR_WRITE) \
SET_COMPAT(dw, wr_##name, value); \
else \
SET_COMPAT(dw, rd_##name, value); \
} while (0)
static inline struct dw_edma_v0_ch_regs __iomem *
__dw_ch_regs(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch)
{
if (dw->chip->mf == EDMA_MF_EDMA_LEGACY)
return &(__dw_regs(dw)->type.legacy.ch);
if (dir == EDMA_DIR_WRITE)
return &__dw_regs(dw)->type.unroll.ch[ch].wr;
return &__dw_regs(dw)->type.unroll.ch[ch].rd;
}
static inline void writel_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
u32 value, void __iomem *addr)
{
if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) {
u32 viewport_sel;
unsigned long flags;
raw_spin_lock_irqsave(&dw->lock, flags);
viewport_sel = FIELD_PREP(EDMA_V0_VIEWPORT_MASK, ch);
if (dir == EDMA_DIR_READ)
viewport_sel |= BIT(31);
writel(viewport_sel,
&(__dw_regs(dw)->type.legacy.viewport_sel));
writel(value, addr);
raw_spin_unlock_irqrestore(&dw->lock, flags);
} else {
writel(value, addr);
}
}
static inline u32 readl_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
const void __iomem *addr)
{
u32 value;
if (dw->chip->mf == EDMA_MF_EDMA_LEGACY) {
u32 viewport_sel;
unsigned long flags;
raw_spin_lock_irqsave(&dw->lock, flags);
viewport_sel = FIELD_PREP(EDMA_V0_VIEWPORT_MASK, ch);
if (dir == EDMA_DIR_READ)
viewport_sel |= BIT(31);
writel(viewport_sel,
&(__dw_regs(dw)->type.legacy.viewport_sel));
value = readl(addr);
raw_spin_unlock_irqrestore(&dw->lock, flags);
} else {
value = readl(addr);
}
return value;
}
#define SET_CH_32(dw, dir, ch, name, value) \
writel_ch(dw, dir, ch, value, &(__dw_ch_regs(dw, dir, ch)->name))
#define GET_CH_32(dw, dir, ch, name) \
readl_ch(dw, dir, ch, &(__dw_ch_regs(dw, dir, ch)->name))
/* eDMA management callbacks */
static void dw_edma_v0_core_off(struct dw_edma *dw)
{
SET_BOTH_32(dw, int_mask,
EDMA_V0_DONE_INT_MASK | EDMA_V0_ABORT_INT_MASK);
SET_BOTH_32(dw, int_clear,
EDMA_V0_DONE_INT_MASK | EDMA_V0_ABORT_INT_MASK);
SET_BOTH_32(dw, engine_en, 0);
}
static u16 dw_edma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir)
{
u32 num_ch;
if (dir == EDMA_DIR_WRITE)
num_ch = FIELD_GET(EDMA_V0_WRITE_CH_COUNT_MASK,
GET_32(dw, ctrl));
else
num_ch = FIELD_GET(EDMA_V0_READ_CH_COUNT_MASK,
GET_32(dw, ctrl));
if (num_ch > EDMA_V0_MAX_NR_CH)
num_ch = EDMA_V0_MAX_NR_CH;
return (u16)num_ch;
}
static enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan)
{
struct dw_edma *dw = chan->dw;
u32 tmp;
tmp = FIELD_GET(EDMA_V0_CH_STATUS_MASK,
GET_CH_32(dw, chan->dir, chan->id, ch_control1));
if (tmp == 1)
return DMA_IN_PROGRESS;
else if (tmp == 3)
return DMA_COMPLETE;
else
return DMA_ERROR;
}
static void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan)
{
struct dw_edma *dw = chan->dw;
SET_RW_32(dw, chan->dir, int_clear,
FIELD_PREP(EDMA_V0_DONE_INT_MASK, BIT(chan->id)));
}
static void dw_edma_v0_core_clear_abort_int(struct dw_edma_chan *chan)
{
struct dw_edma *dw = chan->dw;
SET_RW_32(dw, chan->dir, int_clear,
FIELD_PREP(EDMA_V0_ABORT_INT_MASK, BIT(chan->id)));
}
static u32 dw_edma_v0_core_status_done_int(struct dw_edma *dw, enum dw_edma_dir dir)
{
return FIELD_GET(EDMA_V0_DONE_INT_MASK,
GET_RW_32(dw, dir, int_status));
}
static u32 dw_edma_v0_core_status_abort_int(struct dw_edma *dw, enum dw_edma_dir dir)
{
return FIELD_GET(EDMA_V0_ABORT_INT_MASK,
GET_RW_32(dw, dir, int_status));
}
static irqreturn_t
dw_edma_v0_core_handle_int(struct dw_edma_irq *dw_irq, enum dw_edma_dir dir,
dw_edma_handler_t done, dw_edma_handler_t abort)
{
struct dw_edma *dw = dw_irq->dw;
unsigned long total, pos, val;
irqreturn_t ret = IRQ_NONE;
struct dw_edma_chan *chan;
unsigned long off;
u32 mask;
if (dir == EDMA_DIR_WRITE) {
total = dw->wr_ch_cnt;
off = 0;
mask = dw_irq->wr_mask;
} else {
total = dw->rd_ch_cnt;
off = dw->wr_ch_cnt;
mask = dw_irq->rd_mask;
}
val = dw_edma_v0_core_status_done_int(dw, dir);
val &= mask;
for_each_set_bit(pos, &val, total) {
chan = &dw->chan[pos + off];
dw_edma_v0_core_clear_done_int(chan);
done(chan);
ret = IRQ_HANDLED;
}
val = dw_edma_v0_core_status_abort_int(dw, dir);
val &= mask;
for_each_set_bit(pos, &val, total) {
chan = &dw->chan[pos + off];
dw_edma_v0_core_clear_abort_int(chan);
abort(chan);
ret = IRQ_HANDLED;
}
return ret;
}
static void dw_edma_v0_write_ll_data(struct dw_edma_chunk *chunk, int i,
u32 control, u32 size, u64 sar, u64 dar)
{
ptrdiff_t ofs = i * sizeof(struct dw_edma_v0_lli);
if (chunk->chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL) {
struct dw_edma_v0_lli *lli = chunk->ll_region.vaddr.mem + ofs;
lli->control = control;
lli->transfer_size = size;
lli->sar.reg = sar;
lli->dar.reg = dar;
} else {
struct dw_edma_v0_lli __iomem *lli = chunk->ll_region.vaddr.io + ofs;
writel(control, &lli->control);
writel(size, &lli->transfer_size);
writeq(sar, &lli->sar.reg);
writeq(dar, &lli->dar.reg);
}
}
static void dw_edma_v0_write_ll_link(struct dw_edma_chunk *chunk,
int i, u32 control, u64 pointer)
{
ptrdiff_t ofs = i * sizeof(struct dw_edma_v0_lli);
if (chunk->chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL) {
struct dw_edma_v0_llp *llp = chunk->ll_region.vaddr.mem + ofs;
llp->control = control;
llp->llp.reg = pointer;
} else {
struct dw_edma_v0_llp __iomem *llp = chunk->ll_region.vaddr.io + ofs;
writel(control, &llp->control);
writeq(pointer, &llp->llp.reg);
}
}
static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
{
struct dw_edma_burst *child;
struct dw_edma_chan *chan = chunk->chan;
u32 control = 0, i = 0;
int j;
if (chunk->cb)
control = DW_EDMA_V0_CB;
j = chunk->bursts_alloc;
list_for_each_entry(child, &chunk->burst->list, list) {
j--;
if (!j) {
control |= DW_EDMA_V0_LIE;
if (!(chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL))
control |= DW_EDMA_V0_RIE;
}
dw_edma_v0_write_ll_data(chunk, i++, control, child->sz,
child->sar, child->dar);
}
control = DW_EDMA_V0_LLP | DW_EDMA_V0_TCB;
if (!chunk->cb)
control |= DW_EDMA_V0_CB;
dw_edma_v0_write_ll_link(chunk, i, control, chunk->ll_region.paddr);
}
static void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
{
struct dw_edma_chan *chan = chunk->chan;
struct dw_edma *dw = chan->dw;
u32 tmp;
dw_edma_v0_core_write_chunk(chunk);
if (first) {
/* Enable engine */
SET_RW_32(dw, chan->dir, engine_en, BIT(0));
if (dw->chip->mf == EDMA_MF_HDMA_COMPAT) {
switch (chan->id) {
case 0:
SET_RW_COMPAT(dw, chan->dir, ch0_pwr_en,
BIT(0));
break;
case 1:
SET_RW_COMPAT(dw, chan->dir, ch1_pwr_en,
BIT(0));
break;
case 2:
SET_RW_COMPAT(dw, chan->dir, ch2_pwr_en,
BIT(0));
break;
case 3:
SET_RW_COMPAT(dw, chan->dir, ch3_pwr_en,
BIT(0));
break;
case 4:
SET_RW_COMPAT(dw, chan->dir, ch4_pwr_en,
BIT(0));
break;
case 5:
SET_RW_COMPAT(dw, chan->dir, ch5_pwr_en,
BIT(0));
break;
case 6:
SET_RW_COMPAT(dw, chan->dir, ch6_pwr_en,
BIT(0));
break;
case 7:
SET_RW_COMPAT(dw, chan->dir, ch7_pwr_en,
BIT(0));
break;
}
}
/* Interrupt unmask - done, abort */
tmp = GET_RW_32(dw, chan->dir, int_mask);
tmp &= ~FIELD_PREP(EDMA_V0_DONE_INT_MASK, BIT(chan->id));
tmp &= ~FIELD_PREP(EDMA_V0_ABORT_INT_MASK, BIT(chan->id));
SET_RW_32(dw, chan->dir, int_mask, tmp);
/* Linked list error */
tmp = GET_RW_32(dw, chan->dir, linked_list_err_en);
tmp |= FIELD_PREP(EDMA_V0_LINKED_LIST_ERR_MASK, BIT(chan->id));
SET_RW_32(dw, chan->dir, linked_list_err_en, tmp);
/* Channel control */
SET_CH_32(dw, chan->dir, chan->id, ch_control1,
(DW_EDMA_V0_CCS | DW_EDMA_V0_LLE));
/* Linked list */
/* llp is not aligned on 64bit -> keep 32bit accesses */
SET_CH_32(dw, chan->dir, chan->id, llp.lsb,
lower_32_bits(chunk->ll_region.paddr));
SET_CH_32(dw, chan->dir, chan->id, llp.msb,
upper_32_bits(chunk->ll_region.paddr));
}
/* Doorbell */
SET_RW_32(dw, chan->dir, doorbell,
FIELD_PREP(EDMA_V0_DOORBELL_CH_MASK, chan->id));
}
static void dw_edma_v0_core_ch_config(struct dw_edma_chan *chan)
{
struct dw_edma *dw = chan->dw;
u32 tmp = 0;
/* MSI done addr - low, high */
SET_RW_32(dw, chan->dir, done_imwr.lsb, chan->msi.address_lo);
SET_RW_32(dw, chan->dir, done_imwr.msb, chan->msi.address_hi);
/* MSI abort addr - low, high */
SET_RW_32(dw, chan->dir, abort_imwr.lsb, chan->msi.address_lo);
SET_RW_32(dw, chan->dir, abort_imwr.msb, chan->msi.address_hi);
/* MSI data - low, high */
switch (chan->id) {
case 0:
case 1:
tmp = GET_RW_32(dw, chan->dir, ch01_imwr_data);
break;
case 2:
case 3:
tmp = GET_RW_32(dw, chan->dir, ch23_imwr_data);
break;
case 4:
case 5:
tmp = GET_RW_32(dw, chan->dir, ch45_imwr_data);
break;
case 6:
case 7:
tmp = GET_RW_32(dw, chan->dir, ch67_imwr_data);
break;
}
if (chan->id & BIT(0)) {
/* Channel odd {1, 3, 5, 7} */
tmp &= EDMA_V0_CH_EVEN_MSI_DATA_MASK;
tmp |= FIELD_PREP(EDMA_V0_CH_ODD_MSI_DATA_MASK,
chan->msi.data);
} else {
/* Channel even {0, 2, 4, 6} */
tmp &= EDMA_V0_CH_ODD_MSI_DATA_MASK;
tmp |= FIELD_PREP(EDMA_V0_CH_EVEN_MSI_DATA_MASK,
chan->msi.data);
}
switch (chan->id) {
case 0:
case 1:
SET_RW_32(dw, chan->dir, ch01_imwr_data, tmp);
break;
case 2:
case 3:
SET_RW_32(dw, chan->dir, ch23_imwr_data, tmp);
break;
case 4:
case 5:
SET_RW_32(dw, chan->dir, ch45_imwr_data, tmp);
break;
case 6:
case 7:
SET_RW_32(dw, chan->dir, ch67_imwr_data, tmp);
break;
}
}
/* eDMA debugfs callbacks */
static void dw_edma_v0_core_debugfs_on(struct dw_edma *dw)
{
dw_edma_v0_debugfs_on(dw);
}
static const struct dw_edma_core_ops dw_edma_v0_core = {
.off = dw_edma_v0_core_off,
.ch_count = dw_edma_v0_core_ch_count,
.ch_status = dw_edma_v0_core_ch_status,
.handle_int = dw_edma_v0_core_handle_int,
.start = dw_edma_v0_core_start,
.ch_config = dw_edma_v0_core_ch_config,
.debugfs_on = dw_edma_v0_core_debugfs_on,
};
void dw_edma_v0_core_register(struct dw_edma *dw)
{
dw->core = &dw_edma_v0_core;
}
| linux-master | drivers/dma/dw-edma/dw-edma-v0-core.c |
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