text: /*
   * FOTG210 UDC Driver supports Bulk transfer so far
   *
   * Copyright (C) 2013 Faraday Technology Corporation
   *
   * Author : Yuan-Hsin Chen <yhchen@faraday-tech.com>
   *
   * 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; version 2 of the License.
   */
  
  #include <linux/dma-mapping.h>
  #include <linux/err.h>
  #include <linux/interrupt.h>
  #include <linux/io.h>
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/usb/ch9.h>
  #include <linux/usb/gadget.h>
  
  #include "fotg210.h"
  
  #define	DRIVER_DESC	"FOTG210 USB Device Controller Driver"
  #define	DRIVER_VERSION	"30-April-2013"
  
  static const char udc_name[] = "fotg210_udc";
  static const char * const fotg210_ep_name[] = {
  	"ep0", "ep1", "ep2", "ep3", "ep4"};
  
  static void fotg210_disable_fifo_int(struct fotg210_ep *ep)
  {
  	u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR1);
  
  	if (ep->dir_in)
  		value |= DMISGR1_MF_IN_INT(ep->epnum - 1);
  	else
  		value |= DMISGR1_MF_OUTSPK_INT(ep->epnum - 1);
  	iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR1);
  }
  
  static void fotg210_enable_fifo_int(struct fotg210_ep *ep)
  {
  	u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR1);
  
  	if (ep->dir_in)
  		value &= ~DMISGR1_MF_IN_INT(ep->epnum - 1);
  	else
  		value &= ~DMISGR1_MF_OUTSPK_INT(ep->epnum - 1);
  	iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR1);
  }
  
  static void fotg210_set_cxdone(struct fotg210_udc *fotg210)
  {
  	u32 value = ioread32(fotg210->reg + FOTG210_DCFESR);
  
  	value |= DCFESR_CX_DONE;
  	iowrite32(value, fotg210->reg + FOTG210_DCFESR);
  }
  
  static void fotg210_done(struct fotg210_ep *ep, struct fotg210_request *req,
  			int status)
  {
  	list_del_init(&req->queue);
  
  	/* don't modify queue heads during completion callback */
  	if (ep->fotg210->gadget.speed == USB_SPEED_UNKNOWN)
  		req->req.status = -ESHUTDOWN;
  	else
  		req->req.status = status;
  
  	spin_unlock(&ep->fotg210->lock);
  	usb_gadget_giveback_request(&ep->ep, &req->req);
  	spin_lock(&ep->fotg210->lock);
  
  	if (ep->epnum) {
  		if (list_empty(&ep->queue))
  			fotg210_disable_fifo_int(ep);
  	} else {
  		fotg210_set_cxdone(ep->fotg210);
  	}
  }
  
  static void fotg210_fifo_ep_mapping(struct fotg210_ep *ep, u32 epnum,
  				u32 dir_in)
  {
  	struct fotg210_udc *fotg210 = ep->fotg210;
  	u32 val;
  
  	/* Driver should map an ep to a fifo and then map the fifo
  	 * to the ep. What a brain-damaged design!
  	 */
  
  	/* map a fifo to an ep */
  	val = ioread32(fotg210->reg + FOTG210_EPMAP);
  	val &= ~EPMAP_FIFONOMSK(epnum, dir_in);
  	val |= EPMAP_FIFONO(epnum, dir_in);
  	iowrite32(val, fotg210->reg + FOTG210_EPMAP);
  
  	/* map the ep to the fifo */
  	val = ioread32(fotg210->reg + FOTG210_FIFOMAP);
  	val &= ~FIFOMAP_EPNOMSK(epnum);
  	val |= FIFOMAP_EPNO(epnum);
  	iowrite32(val, fotg210->reg + FOTG210_FIFOMAP);
  
  	/* enable fifo */
  	val = ioread32(fotg210->reg + FOTG210_FIFOCF);
  	val |= FIFOCF_FIFO_EN(epnum - 1);
  	iowrite32(val, fotg210->reg + FOTG210_FIFOCF);
  }
  
  static void fotg210_set_fifo_dir(struct fotg210_ep *ep, u32 epnum, u32 dir_in)
  {
  	struct fotg210_udc *fotg210 = ep->fotg210;
  	u32 val;
  
  	val = ioread32(fotg210->reg + FOTG210_FIFOMAP);
  	val |= (dir_in ? FIFOMAP_DIRIN(epnum - 1) : FIFOMAP_DIROUT(epnum - 1));
  	iowrite32(val, fotg210->reg + FOTG210_FIFOMAP);
  }
  
  static void fotg210_set_tfrtype(struct fotg210_ep *ep, u32 epnum, u32 type)
  {
  	struct fotg210_udc *fotg210 = ep->fotg210;
  	u32 val;
  
  	val = ioread32(fotg210->reg + FOTG210_FIFOCF);
  	val |= FIFOCF_TYPE(type, epnum - 1);
  	iowrite32(val, fotg210->reg + FOTG210_FIFOCF);
  }
  
  static void fotg210_set_mps(struct fotg210_ep *ep, u32 epnum, u32 mps,
  				u32 dir_in)
  {
  	struct fotg210_udc *fotg210 = ep->fotg210;
  	u32 val;
  	u32 offset = dir_in ? FOTG210_INEPMPSR(epnum) :
  				FOTG210_OUTEPMPSR(epnum);
  
  	val = ioread32(fotg210->reg + offset);
  	val |= INOUTEPMPSR_MPS(mps);
  	iowrite32(val, fotg210->reg + offset);
  }
  
  static int fotg210_config_ep(struct fotg210_ep *ep,
  		     const struct usb_endpoint_descriptor *desc)
  {
  	struct fotg210_udc *fotg210 = ep->fotg210;
  
  	fotg210_set_fifo_dir(ep, ep->epnum, ep->dir_in);
  	fotg210_set_tfrtype(ep, ep->epnum, ep->type);
  	fotg210_set_mps(ep, ep->epnum, ep->ep.maxpacket, ep->dir_in);
  	fotg210_fifo_ep_mapping(ep, ep->epnum, ep->dir_in);
  
  	fotg210->ep[ep->epnum] = ep;
  
  	return 0;
  }
  
  static int fotg210_ep_enable(struct usb_ep *_ep,
  			  const struct usb_endpoint_descriptor *desc)
  {
  	struct fotg210_ep *ep;
  
  	ep = container_of(_ep, struct fotg210_ep, ep);
  
  	ep->desc = desc;
  	ep->epnum = usb_endpoint_num(desc);
  	ep->type = usb_endpoint_type(desc);
  	ep->dir_in = usb_endpoint_dir_in(desc);
  	ep->ep.maxpacket = usb_endpoint_maxp(desc);
  
  	return fotg210_config_ep(ep, desc);
  }
  
  static void fotg210_reset_tseq(struct fotg210_udc *fotg210, u8 epnum)
  {
  	struct fotg210_ep *ep = fotg210->ep[epnum];
  	u32 value;
  	void __iomem *reg;
  
  	reg = (ep->dir_in) ?
  		fotg210->reg + FOTG210_INEPMPSR(epnum) :
  		fotg210->reg + FOTG210_OUTEPMPSR(epnum);
  
  	/* Note: Driver needs to set and clear INOUTEPMPSR_RESET_TSEQ
  	 *	 bit. Controller wouldn't clear this bit. WTF!!!
  	 */
  
  	value = ioread32(reg);
  	value |= INOUTEPMPSR_RESET_TSEQ;
  	iowrite32(value, reg);
  
  	value = ioread32(reg);
  	value &= ~INOUTEPMPSR_RESET_TSEQ;
  	iowrite32(value, reg);
  }
  
  static int fotg210_ep_release(struct fotg210_ep *ep)
  {
  	if (!ep->epnum)
  		return 0;
  	ep->epnum = 0;
  	ep->stall = 0;
  	ep->wedged = 0;
  
  	fotg210_reset_tseq(ep->fotg210, ep->epnum);
  
  	return 0;
  }
  
  static int fotg210_ep_disable(struct usb_ep *_ep)
  {
  	struct fotg210_ep *ep;
  	struct fotg210_request *req;
  	unsigned long flags;
  
  	BUG_ON(!_ep);
  
  	ep = container_of(_ep, struct fotg210_ep, ep);
  
  	while (!list_empty(&ep->queue)) {
  		req = list_entry(ep->queue.next,
  			struct fotg210_request, queue);
  		spin_lock_irqsave(&ep->fotg210->lock, flags);
  		fotg210_done(ep, req, -ECONNRESET);
  		spin_unlock_irqrestore(&ep->fotg210->lock, flags);
  	}
  
  	return fotg210_ep_release(ep);
  }
  
  static struct usb_request *fotg210_ep_alloc_request(struct usb_ep *_ep,
  						gfp_t gfp_flags)
  {
  	struct fotg210_request *req;
  
  	req = kzalloc(sizeof(struct fotg210_request), gfp_flags);
  	if (!req)
  		return NULL;
  
  	INIT_LIST_HEAD(&req->queue);
  
  	return &req->req;
  }
  
  static void fotg210_ep_free_request(struct usb_ep *_ep,
  					struct usb_request *_req)
  {
  	struct fotg210_request *req;
  
  	req = container_of(_req, struct fotg210_request, req);
  	kfree(req);
  }
  
  static void fotg210_enable_dma(struct fotg210_ep *ep,
  			      dma_addr_t d, u32 len)
  {
  	u32 value;
  	struct fotg210_udc *fotg210 = ep->fotg210;
  
  	/* set transfer length and direction */
  	value = ioread32(fotg210->reg + FOTG210_DMACPSR1);
  	value &= ~(DMACPSR1_DMA_LEN(0xFFFF) | DMACPSR1_DMA_TYPE(1));
  	value |= DMACPSR1_DMA_LEN(len) | DMACPSR1_DMA_TYPE(ep->dir_in);
  	iowrite32(value, fotg210->reg + FOTG210_DMACPSR1);
  
  	/* set device DMA target FIFO number */
  	value = ioread32(fotg210->reg + FOTG210_DMATFNR);
  	if (ep->epnum)
  		value |= DMATFNR_ACC_FN(ep->epnum - 1);
  	else
  		value |= DMATFNR_ACC_CXF;
  	iowrite32(value, fotg210->reg + FOTG210_DMATFNR);
  
  	/* set DMA memory address */
  	iowrite32(d, fotg210->reg + FOTG210_DMACPSR2);
  
  	/* enable MDMA_EROR and MDMA_CMPLT interrupt */
  	value = ioread32(fotg210->reg + FOTG210_DMISGR2);
  	value &= ~(DMISGR2_MDMA_CMPLT | DMISGR2_MDMA_ERROR);
  	iowrite32(value, fotg210->reg + FOTG210_DMISGR2);
  
  	/* start DMA */
  	value = ioread32(fotg210->reg + FOTG210_DMACPSR1);
  	value |= DMACPSR1_DMA_START;
  	iowrite32(value, fotg210->reg + FOTG210_DMACPSR1);
  }
  
  static void fotg210_disable_dma(struct fotg210_ep *ep)
  {
  	iowrite32(DMATFNR_DISDMA, ep->fotg210->reg + FOTG210_DMATFNR);
  }
  
  static void fotg210_wait_dma_done(struct fotg210_ep *ep)
  {
  	u32 value;
  
  	do {
  		value = ioread32(ep->fotg210->reg + FOTG210_DISGR2);
  		if ((value & DISGR2_USBRST_INT) ||
  		    (value & DISGR2_DMA_ERROR))
  			goto dma_reset;
  	} while (!(value & DISGR2_DMA_CMPLT));
  
  	value &= ~DISGR2_DMA_CMPLT;
  	iowrite32(value, ep->fotg210->reg + FOTG210_DISGR2);
  	return;
  
  dma_reset:
  	value = ioread32(ep->fotg210->reg + FOTG210_DMACPSR1);
  	value |= DMACPSR1_DMA_ABORT;
  	iowrite32(value, ep->fotg210->reg + FOTG210_DMACPSR1);
  
  	/* reset fifo */
  	if (ep->epnum) {
  		value = ioread32(ep->fotg210->reg +
  				FOTG210_FIBCR(ep->epnum - 1));
  		value |= FIBCR_FFRST;
  		iowrite32(value, ep->fotg210->reg +
  				FOTG210_FIBCR(ep->epnum - 1));
  	} else {
  		value = ioread32(ep->fotg210->reg + FOTG210_DCFESR);
  		value |= DCFESR_CX_CLR;
  		iowrite32(value, ep->fotg210->reg + FOTG210_DCFESR);
  	}
  }
  
  static void fotg210_start_dma(struct fotg210_ep *ep,
  			struct fotg210_request *req)
  {
  	dma_addr_t d;
  	u8 *buffer;
  	u32 length;
  
  	if (ep->epnum) {
  		if (ep->dir_in) {
  			buffer = req->req.buf;
  			length = req->req.length;
  		} else {
  			buffer = req->req.buf + req->req.actual;
  			length = ioread32(ep->fotg210->reg +
  					FOTG210_FIBCR(ep->epnum - 1));
  			length &= FIBCR_BCFX;
  		}
  	} else {
  		buffer = req->req.buf + req->req.actual;
  		if (req->req.length - req->req.actual > ep->ep.maxpacket)
  			length = ep->ep.maxpacket;
  		else
  			length = req->req.length;
  	}
  
  	d = dma_map_single(NULL, buffer, length,
  			ep->dir_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
  
  	if (dma_mapping_error(NULL, d)) {
  		pr_err("dma_mapping_error\n");
  		return;
  	}
  
  	dma_sync_single_for_device(NULL, d, length,
  				   ep->dir_in ? DMA_TO_DEVICE :
  					DMA_FROM_DEVICE);
  
  	fotg210_enable_dma(ep, d, length);
  
  	/* check if dma is done */
  	fotg210_wait_dma_done(ep);
  
  	fotg210_disable_dma(ep);
  
  	/* update actual transfer length */
  	req->req.actual += length;
  
  	dma_unmap_single(NULL, d, length, DMA_TO_DEVICE);
  }
  
  static void fotg210_ep0_queue(struct fotg210_ep *ep,
  				struct fotg210_request *req)
  {
  	if (!req->req.length) {
  		fotg210_done(ep, req, 0);
  		return;
  	}
  	if (ep->dir_in) { /* if IN */
  		fotg210_start_dma(ep, req);
  		if ((req->req.length == req->req.actual) ||
  		    (req->req.actual < ep->ep.maxpacket))
  			fotg210_done(ep, req, 0);
  	} else { /* OUT */
  		u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR0);
  
  		value &= ~DMISGR0_MCX_OUT_INT;
  		iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR0);
  	}
  }
  
  static int fotg210_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
  				gfp_t gfp_flags)
  {
  	struct fotg210_ep *ep;
  	struct fotg210_request *req;
  	unsigned long flags;
  	int request = 0;
  
  	ep = container_of(_ep, struct fotg210_ep, ep);
  	req = container_of(_req, struct fotg210_request, req);
  
  	if (ep->fotg210->gadget.speed == USB_SPEED_UNKNOWN)
  		return -ESHUTDOWN;
  
  	spin_lock_irqsave(&ep->fotg210->lock, flags);
  
  	if (list_empty(&ep->queue))
  		request = 1;
  
  	list_add_tail(&req->queue, &ep->queue);
  
  	req->req.actual = 0;
  	req->req.status = -EINPROGRESS;
  
  	if (!ep->epnum) /* ep0 */
  		fotg210_ep0_queue(ep, req);
  	else if (request && !ep->stall)
  		fotg210_enable_fifo_int(ep);
  
  	spin_unlock_irqrestore(&ep->fotg210->lock, flags);
  
  	return 0;
  }
  
  static int fotg210_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
  {
  	struct fotg210_ep *ep;
  	struct fotg210_request *req;
  	unsigned long flags;
  
  	ep = container_of(_ep, struct fotg210_ep, ep);
  	req = container_of(_req, struct fotg210_request, req);
  
  	spin_lock_irqsave(&ep->fotg210->lock, flags);
  	if (!list_empty(&ep->queue))
  		fotg210_done(ep, req, -ECONNRESET);
  	spin_unlock_irqrestore(&ep->fotg210->lock, flags);
  
  	return 0;
  }
  
  static void fotg210_set_epnstall(struct fotg210_ep *ep)
  {
  	struct fotg210_udc *fotg210 = ep->fotg210;
  	u32 value;
  	void __iomem *reg;
  
  	/* check if IN FIFO is empty before stall */
  	if (ep->dir_in) {
  		do {
  			value = ioread32(fotg210->reg + FOTG210_DCFESR);
  		} while (!(value & DCFESR_FIFO_EMPTY(ep->epnum - 1)));
  	}
  
  	reg = (ep->dir_in) ?
  		fotg210->reg + FOTG210_INEPMPSR(ep->epnum) :
  		fotg210->reg + FOTG210_OUTEPMPSR(ep->epnum);
  	value = ioread32(reg);
  	value |= INOUTEPMPSR_STL_EP;
  	iowrite32(value, reg);
  }
  
  static void fotg210_clear_epnstall(struct fotg210_ep *ep)
  {
  	struct fotg210_udc *fotg210 = ep->fotg210;
  	u32 value;
  	void __iomem *reg;
  
  	reg = (ep->dir_in) ?
  		fotg210->reg + FOTG210_INEPMPSR(ep->epnum) :
  		fotg210->reg + FOTG210_OUTEPMPSR(ep->epnum);
  	value = ioread32(reg);
  	value &= ~INOUTEPMPSR_STL_EP;
  	iowrite32(value, reg);
  }
  
  static int fotg210_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedge)
  {
  	struct fotg210_ep *ep;
  	struct fotg210_udc *fotg210;
  	unsigned long flags;
  	int ret = 0;
  
  	ep = container_of(_ep, struct fotg210_ep, ep);
  
  	fotg210 = ep->fotg210;
  
  	spin_lock_irqsave(&ep->fotg210->lock, flags);
  
  	if (value) {
  		fotg210_set_epnstall(ep);
  		ep->stall = 1;
  		if (wedge)
  			ep->wedged = 1;
  	} else {
  		fotg210_reset_tseq(fotg210, ep->epnum);
  		fotg210_clear_epnstall(ep);
  		ep->stall = 0;
  		ep->wedged = 0;
  		if (!list_empty(&ep->queue))
  			fotg210_enable_fifo_int(ep);
  	}
  
  	spin_unlock_irqrestore(&ep->fotg210->lock, flags);
  	return ret;
  }
  
  static int fotg210_ep_set_halt(struct usb_ep *_ep, int value)
  {
  	return fotg210_set_halt_and_wedge(_ep, value, 0);
  }
  
  static int fotg210_ep_set_wedge(struct usb_ep *_ep)
  {
  	return fotg210_set_halt_and_wedge(_ep, 1, 1);
  }
  
  static void fotg210_ep_fifo_flush(struct usb_ep *_ep)
  {
  }
  
  static const struct usb_ep_ops fotg210_ep_ops = {
  	.enable		= fotg210_ep_enable,
  	.disable	= fotg210_ep_disable,
  
  	.alloc_request	= fotg210_ep_alloc_request,
  	.free_request	= fotg210_ep_free_request,
  
  	.queue		= fotg210_ep_queue,
  	.dequeue	= fotg210_ep_dequeue,
  
  	.set_halt	= fotg210_ep_set_halt,
  	.fifo_flush	= fotg210_ep_fifo_flush,
  	.set_wedge	= fotg210_ep_set_wedge,
  };
  
  static void fotg210_clear_tx0byte(struct fotg210_udc *fotg210)
  {
  	u32 value = ioread32(fotg210->reg + FOTG210_TX0BYTE);
  
  	value &= ~(TX0BYTE_EP1 | TX0BYTE_EP2 | TX0BYTE_EP3
  		   | TX0BYTE_EP4);
  	iowrite32(value, fotg210->reg + FOTG210_TX0BYTE);
  }
  
  static void fotg210_clear_rx0byte(struct fotg210_udc *fotg210)
  {
  	u32 value = ioread32(fotg210->reg + FOTG210_RX0BYTE);
  
  	value &= ~(RX0BYTE_EP1 | RX0BYTE_EP2 | RX0BYTE_EP3
  		   | RX0BYTE_EP4);
  	iowrite32(value, fotg210->reg + FOTG210_RX0BYTE);
  }
  
  /* read 8-byte setup packet only */
  static void fotg210_rdsetupp(struct fotg210_udc *fotg210,
  		   u8 *buffer)
  {
  	int i = 0;
  	u8 *tmp = buffer;
  	u32 data;
  	u32 length = 8;
  
  	iowrite32(DMATFNR_ACC_CXF, fotg210->reg + FOTG210_DMATFNR);
  
  	for (i = (length >> 2); i > 0; i--) {
  		data = ioread32(fotg210->reg + FOTG210_CXPORT);
  		*tmp = data & 0xFF;
  		*(tmp + 1) = (data >> 8) & 0xFF;
  		*(tmp + 2) = (data >> 16) & 0xFF;
  		*(tmp + 3) = (data >> 24) & 0xFF;
  		tmp = tmp + 4;
  	}
  
  	switch (length % 4) {
  	case 1:
  		data = ioread32(fotg210->reg + FOTG210_CXPORT);
  		*tmp = data & 0xFF;
  		break;
  	case 2:
  		data = ioread32(fotg210->reg + FOTG210_CXPORT);
  		*tmp = data & 0xFF;
  		*(tmp + 1) = (data >> 8) & 0xFF;
  		break;
  	case 3:
  		data = ioread32(fotg210->reg + FOTG210_CXPORT);
  		*tmp = data & 0xFF;
  		*(tmp + 1) = (data >> 8) & 0xFF;
  		*(tmp + 2) = (data >> 16) & 0xFF;
  		break;
  	default:
  		break;
  	}
  
  	iowrite32(DMATFNR_DISDMA, fotg210->reg + FOTG210_DMATFNR);
  }
  
  static void fotg210_set_configuration(struct fotg210_udc *fotg210)
  {
  	u32 value = ioread32(fotg210->reg + FOTG210_DAR);
  
  	value |= DAR_AFT_CONF;
  	iowrite32(value, fotg210->reg + FOTG210_DAR);
  }
  
  static void fotg210_set_dev_addr(struct fotg210_udc *fotg210, u32 addr)
  {
  	u32 value = ioread32(fotg210->reg + FOTG210_DAR);
  
  	value |= (addr & 0x7F);
  	iowrite32(value, fotg210->reg + FOTG210_DAR);
  }
  
  static void fotg210_set_cxstall(struct fotg210_udc *fotg210)
  {
  	u32 value = ioread32(fotg210->reg + FOTG210_DCFESR);
  
  	value |= DCFESR_CX_STL;
  	iowrite32(value, fotg210->reg + FOTG210_DCFESR);
  }
  
  static void fotg210_request_error(struct fotg210_udc *fotg210)
  {
  	fotg210_set_cxstall(fotg210);
  	pr_err("request error!!\n");
  }
  
  static void fotg210_set_address(struct fotg210_udc *fotg210,
  				struct usb_ctrlrequest *ctrl)
  {
  	if (ctrl->wValue >= 0x0100) {
  		fotg210_request_error(fotg210);
  	} else {
  		fotg210_set_dev_addr(fotg210, ctrl->wValue);
  		fotg210_set_cxdone(fotg210);
  	}
  }
  
  static void fotg210_set_feature(struct fotg210_udc *fotg210,
  				struct usb_ctrlrequest *ctrl)
  {
  	switch (ctrl->bRequestType & USB_RECIP_MASK) {
  	case USB_RECIP_DEVICE:
  		fotg210_set_cxdone(fotg210);
  		break;
  	case USB_RECIP_INTERFACE:
  		fotg210_set_cxdone(fotg210);
  		break;
  	case USB_RECIP_ENDPOINT: {
  		u8 epnum;
  		epnum = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
  		if (epnum)
  			fotg210_set_epnstall(fotg210->ep[epnum]);
  		else
  			fotg210_set_cxstall(fotg210);
  		fotg210_set_cxdone(fotg210);
  		}
  		break;
  	default:
  		fotg210_request_error(fotg210);
  		break;
  	}
  }
  
  static void fotg210_clear_feature(struct fotg210_udc *fotg210,
  				struct usb_ctrlrequest *ctrl)
  {
  	struct fotg210_ep *ep =
  		fotg210->ep[ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK];
  
  	switch (ctrl->bRequestType & USB_RECIP_MASK) {
  	case USB_RECIP_DEVICE:
  		fotg210_set_cxdone(fotg210);
  		break;
  	case USB_RECIP_INTERFACE:
  		fotg210_set_cxdone(fotg210);
  		break;
  	case USB_RECIP_ENDPOINT:
  		if (ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK) {
  			if (ep->wedged) {
  				fotg210_set_cxdone(fotg210);
  				break;
  			}
  			if (ep->stall)
  				fotg210_set_halt_and_wedge(&ep->ep, 0, 0);
  		}
  		fotg210_set_cxdone(fotg210);
  		break;
  	default:
  		fotg210_request_error(fotg210);
  		break;
  	}
  }
  
  static int fotg210_is_epnstall(struct fotg210_ep *ep)
  {
  	struct fotg210_udc *fotg210 = ep->fotg210;
  	u32 value;
  	void __iomem *reg;
  
  	reg = (ep->dir_in) ?
  		fotg210->reg + FOTG210_INEPMPSR(ep->epnum) :
  		fotg210->reg + FOTG210_OUTEPMPSR(ep->epnum);
  	value = ioread32(reg);
  	return value & INOUTEPMPSR_STL_EP ? 1 : 0;
  }
  
  static void fotg210_get_status(struct fotg210_udc *fotg210,
  				struct usb_ctrlrequest *ctrl)
  {
  	u8 epnum;
  
  	switch (ctrl->bRequestType & USB_RECIP_MASK) {
  	case USB_RECIP_DEVICE:
  		fotg210->ep0_data = 1 << USB_DEVICE_SELF_POWERED;
  		break;
  	case USB_RECIP_INTERFACE:
  		fotg210->ep0_data = 0;
  		break;
  	case USB_RECIP_ENDPOINT:
  		epnum = ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK;
  		if (epnum)
  			fotg210->ep0_data =
  				fotg210_is_epnstall(fotg210->ep[epnum])
  				<< USB_ENDPOINT_HALT;
  		else
  			fotg210_request_error(fotg210);
  		break;
  
  	default:
  		fotg210_request_error(fotg210);
  		return;		/* exit */
  	}
  
  	fotg210->ep0_req->buf = &fotg210->ep0_data;
  	fotg210->ep0_req->length = 2;
  
  	spin_unlock(&fotg210->lock);
  	fotg210_ep_queue(fotg210->gadget.ep0, fotg210->ep0_req, GFP_KERNEL);
  	spin_lock(&fotg210->lock);
  }
  
  static int fotg210_setup_packet(struct fotg210_udc *fotg210,
  				struct usb_ctrlrequest *ctrl)
  {
  	u8 *p = (u8 *)ctrl;
  	u8 ret = 0;
  
  	fotg210_rdsetupp(fotg210, p);
  
  	fotg210->ep[0]->dir_in = ctrl->bRequestType & USB_DIR_IN;
  
  	if (fotg210->gadget.speed == USB_SPEED_UNKNOWN) {
  		u32 value = ioread32(fotg210->reg + FOTG210_DMCR);
  		fotg210->gadget.speed = value & DMCR_HS_EN ?
  				USB_SPEED_HIGH : USB_SPEED_FULL;
  	}
  
  	/* check request */
  	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
  		switch (ctrl->bRequest) {
  		case USB_REQ_GET_STATUS:
  			fotg210_get_status(fotg210, ctrl);
  			break;
  		case USB_REQ_CLEAR_FEATURE:
  			fotg210_clear_feature(fotg210, ctrl);
  			break;
  		case USB_REQ_SET_FEATURE:
  			fotg210_set_feature(fotg210, ctrl);
  			break;
  		case USB_REQ_SET_ADDRESS:
  			fotg210_set_address(fotg210, ctrl);
  			break;
  		case USB_REQ_SET_CONFIGURATION:
  			fotg210_set_configuration(fotg210);
  			ret = 1;
  			break;
  		default:
  			ret = 1;
  			break;
  		}
  	} else {
  		ret = 1;
  	}
  
  	return ret;
  }
  
  static void fotg210_ep0out(struct fotg210_udc *fotg210)
  {
  	struct fotg210_ep *ep = fotg210->ep[0];
  
  	if (!list_empty(&ep->queue) && !ep->dir_in) {
  		struct fotg210_request *req;
  
  		req = list_first_entry(&ep->queue,
  			struct fotg210_request, queue);
  
  		if (req->req.length)
  			fotg210_start_dma(ep, req);
  
  		if ((req->req.length - req->req.actual) < ep->ep.maxpacket)
  			fotg210_done(ep, req, 0);
  	} else {
  		pr_err("%s : empty queue\n", __func__);
  	}
  }
  
  static void fotg210_ep0in(struct fotg210_udc *fotg210)
  {
  	struct fotg210_ep *ep = fotg210->ep[0];
  
  	if ((!list_empty(&ep->queue)) && (ep->dir_in)) {
  		struct fotg210_request *req;
  
  		req = list_entry(ep->queue.next,
  				struct fotg210_request, queue);
  
  		if (req->req.length)
  			fotg210_start_dma(ep, req);
  
  		if ((req->req.length - req->req.actual) < ep->ep.maxpacket)
  			fotg210_done(ep, req, 0);
  	} else {
  		fotg210_set_cxdone(fotg210);
  	}
  }
  
  static void fotg210_clear_comabt_int(struct fotg210_udc *fotg210)
  {
  	u32 value = ioread32(fotg210->reg + FOTG210_DISGR0);
  
  	value &= ~DISGR0_CX_COMABT_INT;
  	iowrite32(value, fotg210->reg + FOTG210_DISGR0);
  }
  
  static void fotg210_in_fifo_handler(struct fotg210_ep *ep)
  {
  	struct fotg210_request *req = list_entry(ep->queue.next,
  					struct fotg210_request, queue);
  
  	if (req->req.length)
  		fotg210_start_dma(ep, req);
  	fotg210_done(ep, req, 0);
  }
  
  static void fotg210_out_fifo_handler(struct fotg210_ep *ep)
  {
  	struct fotg210_request *req = list_entry(ep->queue.next,
  						 struct fotg210_request, queue);
  
  	fotg210_start_dma(ep, req);
  
  	/* finish out transfer */
  	if (req->req.length == req->req.actual ||
  	    req->req.actual < ep->ep.maxpacket)
  		fotg210_done(ep, req, 0);
  }
  
  static irqreturn_t fotg210_irq(int irq, void *_fotg210)
  {
  	struct fotg210_udc *fotg210 = _fotg210;
  	u32 int_grp = ioread32(fotg210->reg + FOTG210_DIGR);
  	u32 int_msk = ioread32(fotg210->reg + FOTG210_DMIGR);
  
  	int_grp &= ~int_msk;
  
  	spin_lock(&fotg210->lock);
  
  	if (int_grp & DIGR_INT_G2) {
  		void __iomem *reg = fotg210->reg + FOTG210_DISGR2;
  		u32 int_grp2 = ioread32(reg);
  		u32 int_msk2 = ioread32(fotg210->reg + FOTG210_DMISGR2);
  		u32 value;
  
  		int_grp2 &= ~int_msk2;
  
  		if (int_grp2 & DISGR2_USBRST_INT) {
  			value = ioread32(reg);
  			value &= ~DISGR2_USBRST_INT;
  			iowrite32(value, reg);
  			pr_info("fotg210 udc reset\n");
  		}
  		if (int_grp2 & DISGR2_SUSP_INT) {
  			value = ioread32(reg);
  			value &= ~DISGR2_SUSP_INT;
  			iowrite32(value, reg);
  			pr_info("fotg210 udc suspend\n");
  		}
  		if (int_grp2 & DISGR2_RESM_INT) {
  			value = ioread32(reg);
  			value &= ~DISGR2_RESM_INT;
  			iowrite32(value, reg);
  			pr_info("fotg210 udc resume\n");
  		}
  		if (int_grp2 & DISGR2_ISO_SEQ_ERR_INT) {
  			value = ioread32(reg);
  			value &= ~DISGR2_ISO_SEQ_ERR_INT;
  			iowrite32(value, reg);
  			pr_info("fotg210 iso sequence error\n");
  		}
  		if (int_grp2 & DISGR2_ISO_SEQ_ABORT_INT) {
  			value = ioread32(reg);
  			value &= ~DISGR2_ISO_SEQ_ABORT_INT;
  			iowrite32(value, reg);
  			pr_info("fotg210 iso sequence abort\n");
  		}
  		if (int_grp2 & DISGR2_TX0BYTE_INT) {
  			fotg210_clear_tx0byte(fotg210);
  			value = ioread32(reg);
  			value &= ~DISGR2_TX0BYTE_INT;
  			iowrite32(value, reg);
  			pr_info("fotg210 transferred 0 byte\n");
  		}
  		if (int_grp2 & DISGR2_RX0BYTE_INT) {
  			fotg210_clear_rx0byte(fotg210);
  			value = ioread32(reg);
  			value &= ~DISGR2_RX0BYTE_INT;
  			iowrite32(value, reg);
  			pr_info("fotg210 received 0 byte\n");
  		}
  		if (int_grp2 & DISGR2_DMA_ERROR) {
  			value = ioread32(reg);
  			value &= ~DISGR2_DMA_ERROR;
  			iowrite32(value, reg);
  		}
  	}
  
  	if (int_grp & DIGR_INT_G0) {
  		void __iomem *reg = fotg210->reg + FOTG210_DISGR0;
  		u32 int_grp0 = ioread32(reg);
  		u32 int_msk0 = ioread32(fotg210->reg + FOTG210_DMISGR0);
  		struct usb_ctrlrequest ctrl;
  
  		int_grp0 &= ~int_msk0;
  
  		/* the highest priority in this source register */
  		if (int_grp0 & DISGR0_CX_COMABT_INT) {
  			fotg210_clear_comabt_int(fotg210);
  			pr_info("fotg210 CX command abort\n");
  		}
  
  		if (int_grp0 & DISGR0_CX_SETUP_INT) {
  			if (fotg210_setup_packet(fotg210, &ctrl)) {
  				spin_unlock(&fotg210->lock);
  				if (fotg210->driver->setup(&fotg210->gadget,
  							   &ctrl) < 0)
  					fotg210_set_cxstall(fotg210);
  				spin_lock(&fotg210->lock);
  			}
  		}
  		if (int_grp0 & DISGR0_CX_COMEND_INT)
  			pr_info("fotg210 cmd end\n");
  
  		if (int_grp0 & DISGR0_CX_IN_INT)
  			fotg210_ep0in(fotg210);
  
  		if (int_grp0 & DISGR0_CX_OUT_INT)
  			fotg210_ep0out(fotg210);
  
  		if (int_grp0 & DISGR0_CX_COMFAIL_INT) {
  			fotg210_set_cxstall(fotg210);
  			pr_info("fotg210 ep0 fail\n");
  		}
  	}
  
  	if (int_grp & DIGR_INT_G1) {
  		void __iomem *reg = fotg210->reg + FOTG210_DISGR1;
  		u32 int_grp1 = ioread32(reg);
  		u32 int_msk1 = ioread32(fotg210->reg + FOTG210_DMISGR1);
  		int fifo;
  
  		int_grp1 &= ~int_msk1;
  
  		for (fifo = 0; fifo < FOTG210_MAX_FIFO_NUM; fifo++) {
  			if (int_grp1 & DISGR1_IN_INT(fifo))
  				fotg210_in_fifo_handler(fotg210->ep[fifo + 1]);
  
  			if ((int_grp1 & DISGR1_OUT_INT(fifo)) ||
  			    (int_grp1 & DISGR1_SPK_INT(fifo)))
  				fotg210_out_fifo_handler(fotg210->ep[fifo + 1]);
  		}
  	}
  
  	spin_unlock(&fotg210->lock);
  
  	return IRQ_HANDLED;
  }
  
  static void fotg210_disable_unplug(struct fotg210_udc *fotg210)
  {
  	u32 reg = ioread32(fotg210->reg + FOTG210_PHYTMSR);
  
  	reg &= ~PHYTMSR_UNPLUG;
  	iowrite32(reg, fotg210->reg + FOTG210_PHYTMSR);
  }
  
  static int fotg210_udc_start(struct usb_gadget *g,
  		struct usb_gadget_driver *driver)
  {
  	struct fotg210_udc *fotg210 = gadget_to_fotg210(g);
  	u32 value;
  
  	/* hook up the driver */
  	driver->driver.bus = NULL;
  	fotg210->driver = driver;
  
  	/* enable device global interrupt */
  	value = ioread32(fotg210->reg + FOTG210_DMCR);
  	value |= DMCR_GLINT_EN;
  	iowrite32(value, fotg210->reg + FOTG210_DMCR);
  
  	return 0;
  }
  
  static void fotg210_init(struct fotg210_udc *fotg210)
  {
  	u32 value;
  
  	/* disable global interrupt and set int polarity to active high */
  	iowrite32(GMIR_MHC_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY,
  		  fotg210->reg + FOTG210_GMIR);
  
  	/* disable device global interrupt */
  	value = ioread32(fotg210->reg + FOTG210_DMCR);
  	value &= ~DMCR_GLINT_EN;
  	iowrite32(value, fotg210->reg + FOTG210_DMCR);
  
  	/* disable all fifo interrupt */
  	iowrite32(~(u32)0, fotg210->reg + FOTG210_DMISGR1);
  
  	/* disable cmd end */
  	value = ioread32(fotg210->reg + FOTG210_DMISGR0);
  	value |= DMISGR0_MCX_COMEND;
  	iowrite32(value, fotg210->reg + FOTG210_DMISGR0);
  }
  
  static int fotg210_udc_stop(struct usb_gadget *g)
  {
  	struct fotg210_udc *fotg210 = gadget_to_fotg210(g);
  	unsigned long	flags;
  
  	spin_lock_irqsave(&fotg210->lock, flags);
  
  	fotg210_init(fotg210);
  	fotg210->driver = NULL;
  
  	spin_unlock_irqrestore(&fotg210->lock, flags);
  
  	return 0;
  }
  
  static const struct usb_gadget_ops fotg210_gadget_ops = {
  	.udc_start		= fotg210_udc_start,
  	.udc_stop		= fotg210_udc_stop,
  };
  
  static int fotg210_udc_remove(struct platform_device *pdev)
  {
  	struct fotg210_udc *fotg210 = platform_get_drvdata(pdev);
  	int i;
  
  	usb_del_gadget_udc(&fotg210->gadget);
  	iounmap(fotg210->reg);
  	free_irq(platform_get_irq(pdev, 0), fotg210);
  
  	fotg210_ep_free_request(&fotg210->ep[0]->ep, fotg210->ep0_req);
  	for (i = 0; i < FOTG210_MAX_NUM_EP; i++)
  		kfree(fotg210->ep[i]);
  	kfree(fotg210);
  
  	return 0;
  }
  
  static int fotg210_udc_probe(struct platform_device *pdev)
  {
  	struct resource *res, *ires;
  	struct fotg210_udc *fotg210 = NULL;
  	struct fotg210_ep *_ep[FOTG210_MAX_NUM_EP];
  	int ret = 0;
  	int i;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	if (!res) {
  		pr_err("platform_get_resource error.\n");
  		return -ENODEV;
  	}
  
  	ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  	if (!ires) {
  		pr_err("platform_get_resource IORESOURCE_IRQ error.\n");
  		return -ENODEV;
  	}
  
  	ret = -ENOMEM;
  
  	/* initialize udc */
  	fotg210 = kzalloc(sizeof(struct fotg210_udc), GFP_KERNEL);
  	if (fotg210 == NULL)
  		goto err;
  
  	for (i = 0; i < FOTG210_MAX_NUM_EP; i++) {
  		_ep[i] = kzalloc(sizeof(struct fotg210_ep), GFP_KERNEL);
  		if (_ep[i] == NULL)
  			goto err_alloc;
  		fotg210->ep[i] = _ep[i];
  	}
  
  	fotg210->reg = ioremap(res->start, resource_size(res));
  	if (fotg210->reg == NULL) {
  		pr_err("ioremap error.\n");
  		goto err_alloc;
  	}
  
  	spin_lock_init(&fotg210->lock);
  
  	platform_set_drvdata(pdev, fotg210);
  
  	fotg210->gadget.ops = &fotg210_gadget_ops;
  
  	fotg210->gadget.max_speed = USB_SPEED_HIGH;
  	fotg210->gadget.dev.parent = &pdev->dev;
  	fotg210->gadget.dev.dma_mask = pdev->dev.dma_mask;
  	fotg210->gadget.name = udc_name;
  
  	INIT_LIST_HEAD(&fotg210->gadget.ep_list);
  
  	for (i = 0; i < FOTG210_MAX_NUM_EP; i++) {
  		struct fotg210_ep *ep = fotg210->ep[i];
  
  		if (i) {
  			INIT_LIST_HEAD(&fotg210->ep[i]->ep.ep_list);
  			list_add_tail(&fotg210->ep[i]->ep.ep_list,
  				      &fotg210->gadget.ep_list);
  		}
  		ep->fotg210 = fotg210;
  		INIT_LIST_HEAD(&ep->queue);
  		ep->ep.name = fotg210_ep_name[i];
  		ep->ep.ops = &fotg210_ep_ops;
  		usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);
  
  		if (i == 0) {
  			ep->ep.caps.type_control = true;
  		} else {
  			ep->ep.caps.type_iso = true;
  			ep->ep.caps.type_bulk = true;
  			ep->ep.caps.type_int = true;
  		}
  
  		ep->ep.caps.dir_in = true;
  		ep->ep.caps.dir_out = true;
  	}
  	usb_ep_set_maxpacket_limit(&fotg210->ep[0]->ep, 0x40);
  	fotg210->gadget.ep0 = &fotg210->ep[0]->ep;
  	INIT_LIST_HEAD(&fotg210->gadget.ep0->ep_list);
  
  	fotg210->ep0_req = fotg210_ep_alloc_request(&fotg210->ep[0]->ep,
  				GFP_KERNEL);
  	if (fotg210->ep0_req == NULL)
  		goto err_map;
  
  	fotg210_init(fotg210);
  
  	fotg210_disable_unplug(fotg210);
  
  	ret = request_irq(ires->start, fotg210_irq, IRQF_SHARED,
  			  udc_name, fotg210);
  	if (ret < 0) {
  		pr_err("request_irq error (%d)\n", ret);
  		goto err_req;
  	}
  
  	ret = usb_add_gadget_udc(&pdev->dev, &fotg210->gadget);
  	if (ret)
  		goto err_add_udc;
  
  	dev_info(&pdev->dev, "version %s\n", DRIVER_VERSION);
  
  	return 0;
  
  err_add_udc:
  	free_irq(ires->start, fotg210);
  
  err_req:
  	fotg210_ep_free_request(&fotg210->ep[0]->ep, fotg210->ep0_req);
  
  err_map:
  	iounmap(fotg210->reg);
  
  err_alloc:
  	for (i = 0; i < FOTG210_MAX_NUM_EP; i++)
  		kfree(fotg210->ep[i]);
  	kfree(fotg210);
  
  err:
  	return ret;
  }
  
  static struct platform_driver fotg210_driver = {
  	.driver		= {
  		.name =	(char *)udc_name,
  	},
  	.probe		= fotg210_udc_probe,
  	.remove		= fotg210_udc_remove,
  };
  
  module_platform_driver(fotg210_driver);
  
  MODULE_AUTHOR("Yuan-Hsin Chen, Feng-Hsin Chiang <john453@faraday-tech.com>");
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION(DRIVER_DESC);
  