text: // SPDX-License-Identifier: GPL-2.0
  /*
   * Texas Instruments Ethernet Switch Driver
   *
   * Copyright (C) 2012 Texas Instruments
   *
   */
  
  #include <linux/kernel.h>
  #include <linux/io.h>
  #include <linux/clk.h>
  #include <linux/timer.h>
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/irqreturn.h>
  #include <linux/interrupt.h>
  #include <linux/if_ether.h>
  #include <linux/etherdevice.h>
  #include <linux/netdevice.h>
  #include <linux/net_tstamp.h>
  #include <linux/phy.h>
  #include <linux/phy/phy.h>
  #include <linux/workqueue.h>
  #include <linux/delay.h>
  #include <linux/pm_runtime.h>
  #include <linux/gpio/consumer.h>
  #include <linux/of.h>
  #include <linux/of_mdio.h>
  #include <linux/of_net.h>
  #include <linux/of_device.h>
  #include <linux/if_vlan.h>
  #include <linux/kmemleak.h>
  #include <linux/sys_soc.h>
  #include <net/page_pool.h>
  #include <linux/bpf.h>
  #include <linux/bpf_trace.h>
  
  #include <linux/pinctrl/consumer.h>
  #include <net/pkt_cls.h>
  
  #include "cpsw.h"
  #include "cpsw_ale.h"
  #include "cpsw_priv.h"
  #include "cpsw_sl.h"
  #include "cpts.h"
  #include "davinci_cpdma.h"
  
  #include <net/pkt_sched.h>
  
  static int debug_level;
  module_param(debug_level, int, 0);
  MODULE_PARM_DESC(debug_level, "cpsw debug level (NETIF_MSG bits)");
  
  static int ale_ageout = 10;
  module_param(ale_ageout, int, 0);
  MODULE_PARM_DESC(ale_ageout, "cpsw ale ageout interval (seconds)");
  
  static int rx_packet_max = CPSW_MAX_PACKET_SIZE;
  module_param(rx_packet_max, int, 0);
  MODULE_PARM_DESC(rx_packet_max, "maximum receive packet size (bytes)");
  
  static int descs_pool_size = CPSW_CPDMA_DESCS_POOL_SIZE_DEFAULT;
  module_param(descs_pool_size, int, 0444);
  MODULE_PARM_DESC(descs_pool_size, "Number of CPDMA CPPI descriptors in pool");
  
  #define for_each_slave(priv, func, arg...)				\
  	do {								\
  		struct cpsw_slave *slave;				\
  		struct cpsw_common *cpsw = (priv)->cpsw;		\
  		int n;							\
  		if (cpsw->data.dual_emac)				\
  			(func)((cpsw)->slaves + priv->emac_port, ##arg);\
  		else							\
  			for (n = cpsw->data.slaves,			\
  					slave = cpsw->slaves;		\
  					n; n--)				\
  				(func)(slave++, ##arg);			\
  	} while (0)
  
  static int cpsw_slave_index_priv(struct cpsw_common *cpsw,
  				 struct cpsw_priv *priv)
  {
  	return cpsw->data.dual_emac ? priv->emac_port : cpsw->data.active_slave;
  }
  
  static int cpsw_get_slave_port(u32 slave_num)
  {
  	return slave_num + 1;
  }
  
  static int cpsw_ndo_vlan_rx_add_vid(struct net_device *ndev,
  				    __be16 proto, u16 vid);
  
  static void cpsw_set_promiscious(struct net_device *ndev, bool enable)
  {
  	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);
  	struct cpsw_ale *ale = cpsw->ale;
  	int i;
  
  	if (cpsw->data.dual_emac) {
  		bool flag = false;
  
  		/* Enabling promiscuous mode for one interface will be
  		 * common for both the interface as the interface shares
  		 * the same hardware resource.
  		 */
  		for (i = 0; i < cpsw->data.slaves; i++)
  			if (cpsw->slaves[i].ndev->flags & IFF_PROMISC)
  				flag = true;
  
  		if (!enable && flag) {
  			enable = true;
  			dev_err(&ndev->dev, "promiscuity not disabled as the other interface is still in promiscuity mode\n");
  		}
  
  		if (enable) {
  			/* Enable Bypass */
  			cpsw_ale_control_set(ale, 0, ALE_BYPASS, 1);
  
  			dev_dbg(&ndev->dev, "promiscuity enabled\n");
  		} else {
  			/* Disable Bypass */
  			cpsw_ale_control_set(ale, 0, ALE_BYPASS, 0);
  			dev_dbg(&ndev->dev, "promiscuity disabled\n");
  		}
  	} else {
  		if (enable) {
  			unsigned long timeout = jiffies + HZ;
  
  			/* Disable Learn for all ports (host is port 0 and slaves are port 1 and up */
  			for (i = 0; i <= cpsw->data.slaves; i++) {
  				cpsw_ale_control_set(ale, i,
  						     ALE_PORT_NOLEARN, 1);
  				cpsw_ale_control_set(ale, i,
  						     ALE_PORT_NO_SA_UPDATE, 1);
  			}
  
  			/* Clear All Untouched entries */
  			cpsw_ale_control_set(ale, 0, ALE_AGEOUT, 1);
  			do {
  				cpu_relax();
  				if (cpsw_ale_control_get(ale, 0, ALE_AGEOUT))
  					break;
  			} while (time_after(timeout, jiffies));
  			cpsw_ale_control_set(ale, 0, ALE_AGEOUT, 1);
  
  			/* Clear all mcast from ALE */
  			cpsw_ale_flush_multicast(ale, ALE_ALL_PORTS, -1);
  			__hw_addr_ref_unsync_dev(&ndev->mc, ndev, NULL);
  
  			/* Flood All Unicast Packets to Host port */
  			cpsw_ale_control_set(ale, 0, ALE_P0_UNI_FLOOD, 1);
  			dev_dbg(&ndev->dev, "promiscuity enabled\n");
  		} else {
  			/* Don't Flood All Unicast Packets to Host port */
  			cpsw_ale_control_set(ale, 0, ALE_P0_UNI_FLOOD, 0);
  
  			/* Enable Learn for all ports (host is port 0 and slaves are port 1 and up */
  			for (i = 0; i <= cpsw->data.slaves; i++) {
  				cpsw_ale_control_set(ale, i,
  						     ALE_PORT_NOLEARN, 0);
  				cpsw_ale_control_set(ale, i,
  						     ALE_PORT_NO_SA_UPDATE, 0);
  			}
  			dev_dbg(&ndev->dev, "promiscuity disabled\n");
  		}
  	}
  }
  
  /**
   * cpsw_set_mc - adds multicast entry to the table if it's not added or deletes
   * if it's not deleted
   * @ndev: device to sync
   * @addr: address to be added or deleted
   * @vid: vlan id, if vid < 0 set/unset address for real device
   * @add: add address if the flag is set or remove otherwise
   */
  static int cpsw_set_mc(struct net_device *ndev, const u8 *addr,
  		       int vid, int add)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	struct cpsw_common *cpsw = priv->cpsw;
  	int mask, flags, ret;
  
  	if (vid < 0) {
  		if (cpsw->data.dual_emac)
  			vid = cpsw->slaves[priv->emac_port].port_vlan;
  		else
  			vid = 0;
  	}
  
  	mask = cpsw->data.dual_emac ? ALE_PORT_HOST : ALE_ALL_PORTS;
  	flags = vid ? ALE_VLAN : 0;
  
  	if (add)
  		ret = cpsw_ale_add_mcast(cpsw->ale, addr, mask, flags, vid, 0);
  	else
  		ret = cpsw_ale_del_mcast(cpsw->ale, addr, 0, flags, vid);
  
  	return ret;
  }
  
  static int cpsw_update_vlan_mc(struct net_device *vdev, int vid, void *ctx)
  {
  	struct addr_sync_ctx *sync_ctx = ctx;
  	struct netdev_hw_addr *ha;
  	int found = 0, ret = 0;
  
  	if (!vdev || !(vdev->flags & IFF_UP))
  		return 0;
  
  	/* vlan address is relevant if its sync_cnt != 0 */
  	netdev_for_each_mc_addr(ha, vdev) {
  		if (ether_addr_equal(ha->addr, sync_ctx->addr)) {
  			found = ha->sync_cnt;
  			break;
  		}
  	}
  
  	if (found)
  		sync_ctx->consumed++;
  
  	if (sync_ctx->flush) {
  		if (!found)
  			cpsw_set_mc(sync_ctx->ndev, sync_ctx->addr, vid, 0);
  		return 0;
  	}
  
  	if (found)
  		ret = cpsw_set_mc(sync_ctx->ndev, sync_ctx->addr, vid, 1);
  
  	return ret;
  }
  
  static int cpsw_add_mc_addr(struct net_device *ndev, const u8 *addr, int num)
  {
  	struct addr_sync_ctx sync_ctx;
  	int ret;
  
  	sync_ctx.consumed = 0;
  	sync_ctx.addr = addr;
  	sync_ctx.ndev = ndev;
  	sync_ctx.flush = 0;
  
  	ret = vlan_for_each(ndev, cpsw_update_vlan_mc, &sync_ctx);
  	if (sync_ctx.consumed < num && !ret)
  		ret = cpsw_set_mc(ndev, addr, -1, 1);
  
  	return ret;
  }
  
  static int cpsw_del_mc_addr(struct net_device *ndev, const u8 *addr, int num)
  {
  	struct addr_sync_ctx sync_ctx;
  
  	sync_ctx.consumed = 0;
  	sync_ctx.addr = addr;
  	sync_ctx.ndev = ndev;
  	sync_ctx.flush = 1;
  
  	vlan_for_each(ndev, cpsw_update_vlan_mc, &sync_ctx);
  	if (sync_ctx.consumed == num)
  		cpsw_set_mc(ndev, addr, -1, 0);
  
  	return 0;
  }
  
  static int cpsw_purge_vlan_mc(struct net_device *vdev, int vid, void *ctx)
  {
  	struct addr_sync_ctx *sync_ctx = ctx;
  	struct netdev_hw_addr *ha;
  	int found = 0;
  
  	if (!vdev || !(vdev->flags & IFF_UP))
  		return 0;
  
  	/* vlan address is relevant if its sync_cnt != 0 */
  	netdev_for_each_mc_addr(ha, vdev) {
  		if (ether_addr_equal(ha->addr, sync_ctx->addr)) {
  			found = ha->sync_cnt;
  			break;
  		}
  	}
  
  	if (!found)
  		return 0;
  
  	sync_ctx->consumed++;
  	cpsw_set_mc(sync_ctx->ndev, sync_ctx->addr, vid, 0);
  	return 0;
  }
  
  static int cpsw_purge_all_mc(struct net_device *ndev, const u8 *addr, int num)
  {
  	struct addr_sync_ctx sync_ctx;
  
  	sync_ctx.addr = addr;
  	sync_ctx.ndev = ndev;
  	sync_ctx.consumed = 0;
  
  	vlan_for_each(ndev, cpsw_purge_vlan_mc, &sync_ctx);
  	if (sync_ctx.consumed < num)
  		cpsw_set_mc(ndev, addr, -1, 0);
  
  	return 0;
  }
  
  static void cpsw_ndo_set_rx_mode(struct net_device *ndev)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	struct cpsw_common *cpsw = priv->cpsw;
  	int slave_port = -1;
  
  	if (cpsw->data.dual_emac)
  		slave_port = priv->emac_port + 1;
  
  	if (ndev->flags & IFF_PROMISC) {
  		/* Enable promiscuous mode */
  		cpsw_set_promiscious(ndev, true);
  		cpsw_ale_set_allmulti(cpsw->ale, IFF_ALLMULTI, slave_port);
  		return;
  	} else {
  		/* Disable promiscuous mode */
  		cpsw_set_promiscious(ndev, false);
  	}
  
  	/* Restore allmulti on vlans if necessary */
  	cpsw_ale_set_allmulti(cpsw->ale,
  			      ndev->flags & IFF_ALLMULTI, slave_port);
  
  	/* add/remove mcast address either for real netdev or for vlan */
  	__hw_addr_ref_sync_dev(&ndev->mc, ndev, cpsw_add_mc_addr,
  			       cpsw_del_mc_addr);
  }
  
  static unsigned int cpsw_rxbuf_total_len(unsigned int len)
  {
  	len += CPSW_HEADROOM;
  	len += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
  
  	return SKB_DATA_ALIGN(len);
  }
  
  static void cpsw_rx_handler(void *token, int len, int status)
  {
  	struct page		*new_page, *page = token;
  	void			*pa = page_address(page);
  	struct cpsw_meta_xdp	*xmeta = pa + CPSW_XMETA_OFFSET;
  	struct cpsw_common	*cpsw = ndev_to_cpsw(xmeta->ndev);
  	int			pkt_size = cpsw->rx_packet_max;
  	int			ret = 0, port, ch = xmeta->ch;
  	int			headroom = CPSW_HEADROOM;
  	struct net_device	*ndev = xmeta->ndev;
  	struct cpsw_priv	*priv;
  	struct page_pool	*pool;
  	struct sk_buff		*skb;
  	struct xdp_buff		xdp;
  	dma_addr_t		dma;
  
  	if (cpsw->data.dual_emac && status >= 0) {
  		port = CPDMA_RX_SOURCE_PORT(status);
  		if (port)
  			ndev = cpsw->slaves[--port].ndev;
  	}
  
  	priv = netdev_priv(ndev);
  	pool = cpsw->page_pool[ch];
  	if (unlikely(status < 0) || unlikely(!netif_running(ndev))) {
  		/* In dual emac mode check for all interfaces */
  		if (cpsw->data.dual_emac && cpsw->usage_count &&
  		    (status >= 0)) {
  			/* The packet received is for the interface which
  			 * is already down and the other interface is up
  			 * and running, instead of freeing which results
  			 * in reducing of the number of rx descriptor in
  			 * DMA engine, requeue page back to cpdma.
  			 */
  			new_page = page;
  			goto requeue;
  		}
  
  		/* the interface is going down, pages are purged */
  		page_pool_recycle_direct(pool, page);
  		return;
  	}
  
  	new_page = page_pool_dev_alloc_pages(pool);
  	if (unlikely(!new_page)) {
  		new_page = page;
  		ndev->stats.rx_dropped++;
  		goto requeue;
  	}
  
  	if (priv->xdp_prog) {
  		int headroom = CPSW_HEADROOM, size = len;
  
  		xdp_init_buff(&xdp, PAGE_SIZE, &priv->xdp_rxq[ch]);
  		if (status & CPDMA_RX_VLAN_ENCAP) {
  			headroom += CPSW_RX_VLAN_ENCAP_HDR_SIZE;
  			size -= CPSW_RX_VLAN_ENCAP_HDR_SIZE;
  		}
  
  		xdp_prepare_buff(&xdp, pa, headroom, size, false);
  
  		port = priv->emac_port + cpsw->data.dual_emac;
  		ret = cpsw_run_xdp(priv, ch, &xdp, page, port, &len);
  		if (ret != CPSW_XDP_PASS)
  			goto requeue;
  
  		headroom = xdp.data - xdp.data_hard_start;
  
  		/* XDP prog can modify vlan tag, so can't use encap header */
  		status &= ~CPDMA_RX_VLAN_ENCAP;
  	}
  
  	/* pass skb to netstack if no XDP prog or returned XDP_PASS */
  	skb = build_skb(pa, cpsw_rxbuf_total_len(pkt_size));
  	if (!skb) {
  		ndev->stats.rx_dropped++;
  		page_pool_recycle_direct(pool, page);
  		goto requeue;
  	}
  
  	skb_reserve(skb, headroom);
  	skb_put(skb, len);
  	skb->dev = ndev;
  	if (status & CPDMA_RX_VLAN_ENCAP)
  		cpsw_rx_vlan_encap(skb);
  	if (priv->rx_ts_enabled)
  		cpts_rx_timestamp(cpsw->cpts, skb);
  	skb->protocol = eth_type_trans(skb, ndev);
  
  	/* mark skb for recycling */
  	skb_mark_for_recycle(skb);
  	netif_receive_skb(skb);
  
  	ndev->stats.rx_bytes += len;
  	ndev->stats.rx_packets++;
  
  requeue:
  	xmeta = page_address(new_page) + CPSW_XMETA_OFFSET;
  	xmeta->ndev = ndev;
  	xmeta->ch = ch;
  
  	dma = page_pool_get_dma_addr(new_page) + CPSW_HEADROOM;
  	ret = cpdma_chan_submit_mapped(cpsw->rxv[ch].ch, new_page, dma,
  				       pkt_size, 0);
  	if (ret < 0) {
  		WARN_ON(ret == -ENOMEM);
  		page_pool_recycle_direct(pool, new_page);
  	}
  }
  
  static void _cpsw_adjust_link(struct cpsw_slave *slave,
  			      struct cpsw_priv *priv, bool *link)
  {
  	struct phy_device	*phy = slave->phy;
  	u32			mac_control = 0;
  	u32			slave_port;
  	struct cpsw_common *cpsw = priv->cpsw;
  
  	if (!phy)
  		return;
  
  	slave_port = cpsw_get_slave_port(slave->slave_num);
  
  	if (phy->link) {
  		mac_control = CPSW_SL_CTL_GMII_EN;
  
  		if (phy->speed == 1000)
  			mac_control |= CPSW_SL_CTL_GIG;
  		if (phy->duplex)
  			mac_control |= CPSW_SL_CTL_FULLDUPLEX;
  
  		/* set speed_in input in case RMII mode is used in 100Mbps */
  		if (phy->speed == 100)
  			mac_control |= CPSW_SL_CTL_IFCTL_A;
  		/* in band mode only works in 10Mbps RGMII mode */
  		else if ((phy->speed == 10) && phy_interface_is_rgmii(phy))
  			mac_control |= CPSW_SL_CTL_EXT_EN; /* In Band mode */
  
  		if (priv->rx_pause)
  			mac_control |= CPSW_SL_CTL_RX_FLOW_EN;
  
  		if (priv->tx_pause)
  			mac_control |= CPSW_SL_CTL_TX_FLOW_EN;
  
  		if (mac_control != slave->mac_control)
  			cpsw_sl_ctl_set(slave->mac_sl, mac_control);
  
  		/* enable forwarding */
  		cpsw_ale_control_set(cpsw->ale, slave_port,
  				     ALE_PORT_STATE, ALE_PORT_STATE_FORWARD);
  
  		*link = true;
  
  		if (priv->shp_cfg_speed &&
  		    priv->shp_cfg_speed != slave->phy->speed &&
  		    !cpsw_shp_is_off(priv))
  			dev_warn(priv->dev,
  				 "Speed was changed, CBS shaper speeds are changed!");
  	} else {
  		mac_control = 0;
  		/* disable forwarding */
  		cpsw_ale_control_set(cpsw->ale, slave_port,
  				     ALE_PORT_STATE, ALE_PORT_STATE_DISABLE);
  
  		cpsw_sl_wait_for_idle(slave->mac_sl, 100);
  
  		cpsw_sl_ctl_reset(slave->mac_sl);
  	}
  
  	if (mac_control != slave->mac_control)
  		phy_print_status(phy);
  
  	slave->mac_control = mac_control;
  }
  
  static void cpsw_adjust_link(struct net_device *ndev)
  {
  	struct cpsw_priv	*priv = netdev_priv(ndev);
  	struct cpsw_common	*cpsw = priv->cpsw;
  	bool			link = false;
  
  	for_each_slave(priv, _cpsw_adjust_link, priv, &link);
  
  	if (link) {
  		if (cpsw_need_resplit(cpsw))
  			cpsw_split_res(cpsw);
  
  		netif_carrier_on(ndev);
  		if (netif_running(ndev))
  			netif_tx_wake_all_queues(ndev);
  	} else {
  		netif_carrier_off(ndev);
  		netif_tx_stop_all_queues(ndev);
  	}
  }
  
  static inline void cpsw_add_dual_emac_def_ale_entries(
  		struct cpsw_priv *priv, struct cpsw_slave *slave,
  		u32 slave_port)
  {
  	struct cpsw_common *cpsw = priv->cpsw;
  	u32 port_mask = 1 << slave_port | ALE_PORT_HOST;
  
  	if (cpsw->version == CPSW_VERSION_1)
  		slave_write(slave, slave->port_vlan, CPSW1_PORT_VLAN);
  	else
  		slave_write(slave, slave->port_vlan, CPSW2_PORT_VLAN);
  	cpsw_ale_add_vlan(cpsw->ale, slave->port_vlan, port_mask,
  			  port_mask, port_mask, 0);
  	cpsw_ale_add_mcast(cpsw->ale, priv->ndev->broadcast,
  			   ALE_PORT_HOST, ALE_VLAN, slave->port_vlan, 0);
  	cpsw_ale_add_ucast(cpsw->ale, priv->mac_addr,
  			   HOST_PORT_NUM, ALE_VLAN |
  			   ALE_SECURE, slave->port_vlan);
  	cpsw_ale_control_set(cpsw->ale, slave_port,
  			     ALE_PORT_DROP_UNKNOWN_VLAN, 1);
  }
  
  static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
  {
  	u32 slave_port;
  	struct phy_device *phy;
  	struct cpsw_common *cpsw = priv->cpsw;
  
  	cpsw_sl_reset(slave->mac_sl, 100);
  	cpsw_sl_ctl_reset(slave->mac_sl);
  
  	/* setup priority mapping */
  	cpsw_sl_reg_write(slave->mac_sl, CPSW_SL_RX_PRI_MAP,
  			  RX_PRIORITY_MAPPING);
  
  	switch (cpsw->version) {
  	case CPSW_VERSION_1:
  		slave_write(slave, TX_PRIORITY_MAPPING, CPSW1_TX_PRI_MAP);
  		/* Increase RX FIFO size to 5 for supporting fullduplex
  		 * flow control mode
  		 */
  		slave_write(slave,
  			    (CPSW_MAX_BLKS_TX << CPSW_MAX_BLKS_TX_SHIFT) |
  			    CPSW_MAX_BLKS_RX, CPSW1_MAX_BLKS);
  		break;
  	case CPSW_VERSION_2:
  	case CPSW_VERSION_3:
  	case CPSW_VERSION_4:
  		slave_write(slave, TX_PRIORITY_MAPPING, CPSW2_TX_PRI_MAP);
  		/* Increase RX FIFO size to 5 for supporting fullduplex
  		 * flow control mode
  		 */
  		slave_write(slave,
  			    (CPSW_MAX_BLKS_TX << CPSW_MAX_BLKS_TX_SHIFT) |
  			    CPSW_MAX_BLKS_RX, CPSW2_MAX_BLKS);
  		break;
  	}
  
  	/* setup max packet size, and mac address */
  	cpsw_sl_reg_write(slave->mac_sl, CPSW_SL_RX_MAXLEN,
  			  cpsw->rx_packet_max);
  	cpsw_set_slave_mac(slave, priv);
  
  	slave->mac_control = 0;	/* no link yet */
  
  	slave_port = cpsw_get_slave_port(slave->slave_num);
  
  	if (cpsw->data.dual_emac)
  		cpsw_add_dual_emac_def_ale_entries(priv, slave, slave_port);
  	else
  		cpsw_ale_add_mcast(cpsw->ale, priv->ndev->broadcast,
  				   1 << slave_port, 0, 0, ALE_MCAST_FWD_2);
  
  	if (slave->data->phy_node) {
  		phy = of_phy_connect(priv->ndev, slave->data->phy_node,
  				 &cpsw_adjust_link, 0, slave->data->phy_if);
  		if (!phy) {
  			dev_err(priv->dev, "phy \"%pOF\" not found on slave %d\n",
  				slave->data->phy_node,
  				slave->slave_num);
  			return;
  		}
  	} else {
  		phy = phy_connect(priv->ndev, slave->data->phy_id,
  				 &cpsw_adjust_link, slave->data->phy_if);
  		if (IS_ERR(phy)) {
  			dev_err(priv->dev,
  				"phy \"%s\" not found on slave %d, err %ld\n",
  				slave->data->phy_id, slave->slave_num,
  				PTR_ERR(phy));
  			return;
  		}
  	}
  
  	slave->phy = phy;
  
  	phy_attached_info(slave->phy);
  
  	phy_start(slave->phy);
  
  	/* Configure GMII_SEL register */
  	if (!IS_ERR(slave->data->ifphy))
  		phy_set_mode_ext(slave->data->ifphy, PHY_MODE_ETHERNET,
  				 slave->data->phy_if);
  	else
  		cpsw_phy_sel(cpsw->dev, slave->phy->interface,
  			     slave->slave_num);
  }
  
  static inline void cpsw_add_default_vlan(struct cpsw_priv *priv)
  {
  	struct cpsw_common *cpsw = priv->cpsw;
  	const int vlan = cpsw->data.default_vlan;
  	u32 reg;
  	int i;
  	int unreg_mcast_mask;
  
  	reg = (cpsw->version == CPSW_VERSION_1) ? CPSW1_PORT_VLAN :
  	       CPSW2_PORT_VLAN;
  
  	writel(vlan, &cpsw->host_port_regs->port_vlan);
  
  	for (i = 0; i < cpsw->data.slaves; i++)
  		slave_write(cpsw->slaves + i, vlan, reg);
  
  	if (priv->ndev->flags & IFF_ALLMULTI)
  		unreg_mcast_mask = ALE_ALL_PORTS;
  	else
  		unreg_mcast_mask = ALE_PORT_1 | ALE_PORT_2;
  
  	cpsw_ale_add_vlan(cpsw->ale, vlan, ALE_ALL_PORTS,
  			  ALE_ALL_PORTS, ALE_ALL_PORTS,
  			  unreg_mcast_mask);
  }
  
  static void cpsw_init_host_port(struct cpsw_priv *priv)
  {
  	u32 fifo_mode;
  	u32 control_reg;
  	struct cpsw_common *cpsw = priv->cpsw;
  
  	/* soft reset the controller and initialize ale */
  	soft_reset("cpsw", &cpsw->regs->soft_reset);
  	cpsw_ale_start(cpsw->ale);
  
  	/* switch to vlan unaware mode */
  	cpsw_ale_control_set(cpsw->ale, HOST_PORT_NUM, ALE_VLAN_AWARE,
  			     CPSW_ALE_VLAN_AWARE);
  	control_reg = readl(&cpsw->regs->control);
  	control_reg |= CPSW_VLAN_AWARE | CPSW_RX_VLAN_ENCAP;
  	writel(control_reg, &cpsw->regs->control);
  	fifo_mode = (cpsw->data.dual_emac) ? CPSW_FIFO_DUAL_MAC_MODE :
  		     CPSW_FIFO_NORMAL_MODE;
  	writel(fifo_mode, &cpsw->host_port_regs->tx_in_ctl);
  
  	/* setup host port priority mapping */
  	writel_relaxed(CPDMA_TX_PRIORITY_MAP,
  		       &cpsw->host_port_regs->cpdma_tx_pri_map);
  	writel_relaxed(0, &cpsw->host_port_regs->cpdma_rx_chan_map);
  
  	cpsw_ale_control_set(cpsw->ale, HOST_PORT_NUM,
  			     ALE_PORT_STATE, ALE_PORT_STATE_FORWARD);
  
  	if (!cpsw->data.dual_emac) {
  		cpsw_ale_add_ucast(cpsw->ale, priv->mac_addr, HOST_PORT_NUM,
  				   0, 0);
  		cpsw_ale_add_mcast(cpsw->ale, priv->ndev->broadcast,
  				   ALE_PORT_HOST, 0, 0, ALE_MCAST_FWD_2);
  	}
  }
  
  static void cpsw_slave_stop(struct cpsw_slave *slave, struct cpsw_common *cpsw)
  {
  	u32 slave_port;
  
  	slave_port = cpsw_get_slave_port(slave->slave_num);
  
  	if (!slave->phy)
  		return;
  	phy_stop(slave->phy);
  	phy_disconnect(slave->phy);
  	slave->phy = NULL;
  	cpsw_ale_control_set(cpsw->ale, slave_port,
  			     ALE_PORT_STATE, ALE_PORT_STATE_DISABLE);
  	cpsw_sl_reset(slave->mac_sl, 100);
  	cpsw_sl_ctl_reset(slave->mac_sl);
  }
  
  static int cpsw_restore_vlans(struct net_device *vdev, int vid, void *arg)
  {
  	struct cpsw_priv *priv = arg;
  
  	if (!vdev)
  		return 0;
  
  	cpsw_ndo_vlan_rx_add_vid(priv->ndev, 0, vid);
  	return 0;
  }
  
  /* restore resources after port reset */
  static void cpsw_restore(struct cpsw_priv *priv)
  {
  	/* restore vlan configurations */
  	vlan_for_each(priv->ndev, cpsw_restore_vlans, priv);
  
  	/* restore MQPRIO offload */
  	for_each_slave(priv, cpsw_mqprio_resume, priv);
  
  	/* restore CBS offload */
  	for_each_slave(priv, cpsw_cbs_resume, priv);
  }
  
  static int cpsw_ndo_open(struct net_device *ndev)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	struct cpsw_common *cpsw = priv->cpsw;
  	int ret;
  	u32 reg;
  
  	ret = pm_runtime_get_sync(cpsw->dev);
  	if (ret < 0) {
  		pm_runtime_put_noidle(cpsw->dev);
  		return ret;
  	}
  
  	netif_carrier_off(ndev);
  
  	/* Notify the stack of the actual queue counts. */
  	ret = netif_set_real_num_tx_queues(ndev, cpsw->tx_ch_num);
  	if (ret) {
  		dev_err(priv->dev, "cannot set real number of tx queues\n");
  		goto err_cleanup;
  	}
  
  	ret = netif_set_real_num_rx_queues(ndev, cpsw->rx_ch_num);
  	if (ret) {
  		dev_err(priv->dev, "cannot set real number of rx queues\n");
  		goto err_cleanup;
  	}
  
  	reg = cpsw->version;
  
  	dev_info(priv->dev, "initializing cpsw version %d.%d (%d)\n",
  		 CPSW_MAJOR_VERSION(reg), CPSW_MINOR_VERSION(reg),
  		 CPSW_RTL_VERSION(reg));
  
  	/* Initialize host and slave ports */
  	if (!cpsw->usage_count)
  		cpsw_init_host_port(priv);
  	for_each_slave(priv, cpsw_slave_open, priv);
  
  	/* Add default VLAN */
  	if (!cpsw->data.dual_emac)
  		cpsw_add_default_vlan(priv);
  	else
  		cpsw_ale_add_vlan(cpsw->ale, cpsw->data.default_vlan,
  				  ALE_ALL_PORTS, ALE_ALL_PORTS, 0, 0);
  
  	/* initialize shared resources for every ndev */
  	if (!cpsw->usage_count) {
  		/* disable priority elevation */
  		writel_relaxed(0, &cpsw->regs->ptype);
  
  		/* enable statistics collection only on all ports */
  		writel_relaxed(0x7, &cpsw->regs->stat_port_en);
  
  		/* Enable internal fifo flow control */
  		writel(0x7, &cpsw->regs->flow_control);
  
  		napi_enable(&cpsw->napi_rx);
  		napi_enable(&cpsw->napi_tx);
  
  		if (cpsw->tx_irq_disabled) {
  			cpsw->tx_irq_disabled = false;
  			enable_irq(cpsw->irqs_table[1]);
  		}
  
  		if (cpsw->rx_irq_disabled) {
  			cpsw->rx_irq_disabled = false;
  			enable_irq(cpsw->irqs_table[0]);
  		}
  
  		/* create rxqs for both infs in dual mac as they use same pool
  		 * and must be destroyed together when no users.
  		 */
  		ret = cpsw_create_xdp_rxqs(cpsw);
  		if (ret < 0)
  			goto err_cleanup;
  
  		ret = cpsw_fill_rx_channels(priv);
  		if (ret < 0)
  			goto err_cleanup;
  
  		if (cpsw->cpts) {
  			if (cpts_register(cpsw->cpts))
  				dev_err(priv->dev, "error registering cpts device\n");
  			else
  				writel(0x10, &cpsw->wr_regs->misc_en);
  		}
  	}
  
  	cpsw_restore(priv);
  
  	/* Enable Interrupt pacing if configured */
  	if (cpsw->coal_intvl != 0) {
  		struct ethtool_coalesce coal;
  
  		coal.rx_coalesce_usecs = cpsw->coal_intvl;
  		cpsw_set_coalesce(ndev, &coal, NULL, NULL);
  	}
  
  	cpdma_ctlr_start(cpsw->dma);
  	cpsw_intr_enable(cpsw);
  	cpsw->usage_count++;
  
  	return 0;
  
  err_cleanup:
  	if (!cpsw->usage_count) {
  		cpdma_ctlr_stop(cpsw->dma);
  		cpsw_destroy_xdp_rxqs(cpsw);
  	}
  
  	for_each_slave(priv, cpsw_slave_stop, cpsw);
  	pm_runtime_put_sync(cpsw->dev);
  	netif_carrier_off(priv->ndev);
  	return ret;
  }
  
  static int cpsw_ndo_stop(struct net_device *ndev)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	struct cpsw_common *cpsw = priv->cpsw;
  
  	cpsw_info(priv, ifdown, "shutting down cpsw device\n");
  	__hw_addr_ref_unsync_dev(&ndev->mc, ndev, cpsw_purge_all_mc);
  	netif_tx_stop_all_queues(priv->ndev);
  	netif_carrier_off(priv->ndev);
  
  	if (cpsw->usage_count <= 1) {
  		napi_disable(&cpsw->napi_rx);
  		napi_disable(&cpsw->napi_tx);
  		cpts_unregister(cpsw->cpts);
  		cpsw_intr_disable(cpsw);
  		cpdma_ctlr_stop(cpsw->dma);
  		cpsw_ale_stop(cpsw->ale);
  		cpsw_destroy_xdp_rxqs(cpsw);
  	}
  	for_each_slave(priv, cpsw_slave_stop, cpsw);
  
  	if (cpsw_need_resplit(cpsw))
  		cpsw_split_res(cpsw);
  
  	cpsw->usage_count--;
  	pm_runtime_put_sync(cpsw->dev);
  	return 0;
  }
  
  static netdev_tx_t cpsw_ndo_start_xmit(struct sk_buff *skb,
  				       struct net_device *ndev)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	struct cpsw_common *cpsw = priv->cpsw;
  	struct cpts *cpts = cpsw->cpts;
  	struct netdev_queue *txq;
  	struct cpdma_chan *txch;
  	int ret, q_idx;
  
  	if (skb_put_padto(skb, CPSW_MIN_PACKET_SIZE)) {
  		cpsw_err(priv, tx_err, "packet pad failed\n");
  		ndev->stats.tx_dropped++;
  		return NET_XMIT_DROP;
  	}
  
  	if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP &&
  	    priv->tx_ts_enabled && cpts_can_timestamp(cpts, skb))
  		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
  
  	q_idx = skb_get_queue_mapping(skb);
  	if (q_idx >= cpsw->tx_ch_num)
  		q_idx = q_idx % cpsw->tx_ch_num;
  
  	txch = cpsw->txv[q_idx].ch;
  	txq = netdev_get_tx_queue(ndev, q_idx);
  	skb_tx_timestamp(skb);
  	ret = cpdma_chan_submit(txch, skb, skb->data, skb->len,
  				priv->emac_port + cpsw->data.dual_emac);
  	if (unlikely(ret != 0)) {
  		cpsw_err(priv, tx_err, "desc submit failed\n");
  		goto fail;
  	}
  
  	/* If there is no more tx desc left free then we need to
  	 * tell the kernel to stop sending us tx frames.
  	 */
  	if (unlikely(!cpdma_check_free_tx_desc(txch))) {
  		netif_tx_stop_queue(txq);
  
  		/* Barrier, so that stop_queue visible to other cpus */
  		smp_mb__after_atomic();
  
  		if (cpdma_check_free_tx_desc(txch))
  			netif_tx_wake_queue(txq);
  	}
  
  	return NETDEV_TX_OK;
  fail:
  	ndev->stats.tx_dropped++;
  	netif_tx_stop_queue(txq);
  
  	/* Barrier, so that stop_queue visible to other cpus */
  	smp_mb__after_atomic();
  
  	if (cpdma_check_free_tx_desc(txch))
  		netif_tx_wake_queue(txq);
  
  	return NETDEV_TX_BUSY;
  }
  
  static int cpsw_ndo_set_mac_address(struct net_device *ndev, void *p)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	struct sockaddr *addr = (struct sockaddr *)p;
  	struct cpsw_common *cpsw = priv->cpsw;
  	int flags = 0;
  	u16 vid = 0;
  	int ret;
  
  	if (!is_valid_ether_addr(addr->sa_data))
  		return -EADDRNOTAVAIL;
  
  	ret = pm_runtime_get_sync(cpsw->dev);
  	if (ret < 0) {
  		pm_runtime_put_noidle(cpsw->dev);
  		return ret;
  	}
  
  	if (cpsw->data.dual_emac) {
  		vid = cpsw->slaves[priv->emac_port].port_vlan;
  		flags = ALE_VLAN;
  	}
  
  	cpsw_ale_del_ucast(cpsw->ale, priv->mac_addr, HOST_PORT_NUM,
  			   flags, vid);
  	cpsw_ale_add_ucast(cpsw->ale, addr->sa_data, HOST_PORT_NUM,
  			   flags, vid);
  
  	memcpy(priv->mac_addr, addr->sa_data, ETH_ALEN);
  	memcpy(ndev->dev_addr, priv->mac_addr, ETH_ALEN);
  	for_each_slave(priv, cpsw_set_slave_mac, priv);
  
  	pm_runtime_put(cpsw->dev);
  
  	return 0;
  }
  
  static inline int cpsw_add_vlan_ale_entry(struct cpsw_priv *priv,
  				unsigned short vid)
  {
  	int ret;
  	int unreg_mcast_mask = 0;
  	int mcast_mask;
  	u32 port_mask;
  	struct cpsw_common *cpsw = priv->cpsw;
  
  	if (cpsw->data.dual_emac) {
  		port_mask = (1 << (priv->emac_port + 1)) | ALE_PORT_HOST;
  
  		mcast_mask = ALE_PORT_HOST;
  		if (priv->ndev->flags & IFF_ALLMULTI)
  			unreg_mcast_mask = mcast_mask;
  	} else {
  		port_mask = ALE_ALL_PORTS;
  		mcast_mask = port_mask;
  
  		if (priv->ndev->flags & IFF_ALLMULTI)
  			unreg_mcast_mask = ALE_ALL_PORTS;
  		else
  			unreg_mcast_mask = ALE_PORT_1 | ALE_PORT_2;
  	}
  
  	ret = cpsw_ale_add_vlan(cpsw->ale, vid, port_mask, 0, port_mask,
  				unreg_mcast_mask);
  	if (ret != 0)
  		return ret;
  
  	ret = cpsw_ale_add_ucast(cpsw->ale, priv->mac_addr,
  				 HOST_PORT_NUM, ALE_VLAN, vid);
  	if (ret != 0)
  		goto clean_vid;
  
  	ret = cpsw_ale_add_mcast(cpsw->ale, priv->ndev->broadcast,
  				 mcast_mask, ALE_VLAN, vid, 0);
  	if (ret != 0)
  		goto clean_vlan_ucast;
  	return 0;
  
  clean_vlan_ucast:
  	cpsw_ale_del_ucast(cpsw->ale, priv->mac_addr,
  			   HOST_PORT_NUM, ALE_VLAN, vid);
  clean_vid:
  	cpsw_ale_del_vlan(cpsw->ale, vid, 0);
  	return ret;
  }
  
  static int cpsw_ndo_vlan_rx_add_vid(struct net_device *ndev,
  				    __be16 proto, u16 vid)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	struct cpsw_common *cpsw = priv->cpsw;
  	int ret;
  
  	if (vid == cpsw->data.default_vlan)
  		return 0;
  
  	ret = pm_runtime_get_sync(cpsw->dev);
  	if (ret < 0) {
  		pm_runtime_put_noidle(cpsw->dev);
  		return ret;
  	}
  
  	if (cpsw->data.dual_emac) {
  		/* In dual EMAC, reserved VLAN id should not be used for
  		 * creating VLAN interfaces as this can break the dual
  		 * EMAC port separation
  		 */
  		int i;
  
  		for (i = 0; i < cpsw->data.slaves; i++) {
  			if (vid == cpsw->slaves[i].port_vlan) {
  				ret = -EINVAL;
  				goto err;
  			}
  		}
  	}
  
  	dev_info(priv->dev, "Adding vlanid %d to vlan filter\n", vid);
  	ret = cpsw_add_vlan_ale_entry(priv, vid);
  err:
  	pm_runtime_put(cpsw->dev);
  	return ret;
  }
  
  static int cpsw_ndo_vlan_rx_kill_vid(struct net_device *ndev,
  				     __be16 proto, u16 vid)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	struct cpsw_common *cpsw = priv->cpsw;
  	int ret;
  
  	if (vid == cpsw->data.default_vlan)
  		return 0;
  
  	ret = pm_runtime_get_sync(cpsw->dev);
  	if (ret < 0) {
  		pm_runtime_put_noidle(cpsw->dev);
  		return ret;
  	}
  
  	if (cpsw->data.dual_emac) {
  		int i;
  
  		for (i = 0; i < cpsw->data.slaves; i++) {
  			if (vid == cpsw->slaves[i].port_vlan)
  				goto err;
  		}
  	}
  
  	dev_info(priv->dev, "removing vlanid %d from vlan filter\n", vid);
  	ret = cpsw_ale_del_vlan(cpsw->ale, vid, 0);
  	ret |= cpsw_ale_del_ucast(cpsw->ale, priv->mac_addr,
  				  HOST_PORT_NUM, ALE_VLAN, vid);
  	ret |= cpsw_ale_del_mcast(cpsw->ale, priv->ndev->broadcast,
  				  0, ALE_VLAN, vid);
  	ret |= cpsw_ale_flush_multicast(cpsw->ale, ALE_PORT_HOST, vid);
  err:
  	pm_runtime_put(cpsw->dev);
  	return ret;
  }
  
  static int cpsw_ndo_xdp_xmit(struct net_device *ndev, int n,
  			     struct xdp_frame **frames, u32 flags)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	struct cpsw_common *cpsw = priv->cpsw;
  	struct xdp_frame *xdpf;
  	int i, nxmit = 0, port;
  
  	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
  		return -EINVAL;
  
  	for (i = 0; i < n; i++) {
  		xdpf = frames[i];
  		if (xdpf->len < CPSW_MIN_PACKET_SIZE)
  			break;
  
  		port = priv->emac_port + cpsw->data.dual_emac;
  		if (cpsw_xdp_tx_frame(priv, xdpf, NULL, port))
  			break;
  		nxmit++;
  	}
  
  	return nxmit;
  }
  
  #ifdef CONFIG_NET_POLL_CONTROLLER
  static void cpsw_ndo_poll_controller(struct net_device *ndev)
  {
  	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);
  
  	cpsw_intr_disable(cpsw);
  	cpsw_rx_interrupt(cpsw->irqs_table[0], cpsw);
  	cpsw_tx_interrupt(cpsw->irqs_table[1], cpsw);
  	cpsw_intr_enable(cpsw);
  }
  #endif
  
  static const struct net_device_ops cpsw_netdev_ops = {
  	.ndo_open		= cpsw_ndo_open,
  	.ndo_stop		= cpsw_ndo_stop,
  	.ndo_start_xmit		= cpsw_ndo_start_xmit,
  	.ndo_set_mac_address	= cpsw_ndo_set_mac_address,
  	.ndo_eth_ioctl		= cpsw_ndo_ioctl,
  	.ndo_validate_addr	= eth_validate_addr,
  	.ndo_tx_timeout		= cpsw_ndo_tx_timeout,
  	.ndo_set_rx_mode	= cpsw_ndo_set_rx_mode,
  	.ndo_set_tx_maxrate	= cpsw_ndo_set_tx_maxrate,
  #ifdef CONFIG_NET_POLL_CONTROLLER
  	.ndo_poll_controller	= cpsw_ndo_poll_controller,
  #endif
  	.ndo_vlan_rx_add_vid	= cpsw_ndo_vlan_rx_add_vid,
  	.ndo_vlan_rx_kill_vid	= cpsw_ndo_vlan_rx_kill_vid,
  	.ndo_setup_tc           = cpsw_ndo_setup_tc,
  	.ndo_bpf		= cpsw_ndo_bpf,
  	.ndo_xdp_xmit		= cpsw_ndo_xdp_xmit,
  };
  
  static void cpsw_get_drvinfo(struct net_device *ndev,
  			     struct ethtool_drvinfo *info)
  {
  	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);
  	struct platform_device	*pdev = to_platform_device(cpsw->dev);
  
  	strlcpy(info->driver, "cpsw", sizeof(info->driver));
  	strlcpy(info->version, "1.0", sizeof(info->version));
  	strlcpy(info->bus_info, pdev->name, sizeof(info->bus_info));
  }
  
  static int cpsw_set_pauseparam(struct net_device *ndev,
  			       struct ethtool_pauseparam *pause)
  {
  	struct cpsw_priv *priv = netdev_priv(ndev);
  	bool link;
  
  	priv->rx_pause = pause->rx_pause ? true : false;
  	priv->tx_pause = pause->tx_pause ? true : false;
  
  	for_each_slave(priv, _cpsw_adjust_link, priv, &link);
  	return 0;
  }
  
  static int cpsw_set_channels(struct net_device *ndev,
  			     struct ethtool_channels *chs)
  {
  	return cpsw_set_channels_common(ndev, chs, cpsw_rx_handler);
  }
  
  static const struct ethtool_ops cpsw_ethtool_ops = {
  	.supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS,
  	.get_drvinfo	= cpsw_get_drvinfo,
  	.get_msglevel	= cpsw_get_msglevel,
  	.set_msglevel	= cpsw_set_msglevel,
  	.get_link	= ethtool_op_get_link,
  	.get_ts_info	= cpsw_get_ts_info,
  	.get_coalesce	= cpsw_get_coalesce,
  	.set_coalesce	= cpsw_set_coalesce,
  	.get_sset_count		= cpsw_get_sset_count,
  	.get_strings		= cpsw_get_strings,
  	.get_ethtool_stats	= cpsw_get_ethtool_stats,
  	.get_pauseparam		= cpsw_get_pauseparam,
  	.set_pauseparam		= cpsw_set_pauseparam,
  	.get_wol	= cpsw_get_wol,
  	.set_wol	= cpsw_set_wol,
  	.get_regs_len	= cpsw_get_regs_len,
  	.get_regs	= cpsw_get_regs,
  	.begin		= cpsw_ethtool_op_begin,
  	.complete	= cpsw_ethtool_op_complete,
  	.get_channels	= cpsw_get_channels,
  	.set_channels	= cpsw_set_channels,
  	.get_link_ksettings	= cpsw_get_link_ksettings,
  	.set_link_ksettings	= cpsw_set_link_ksettings,
  	.get_eee	= cpsw_get_eee,
  	.set_eee	= cpsw_set_eee,
  	.nway_reset	= cpsw_nway_reset,
  	.get_ringparam = cpsw_get_ringparam,
  	.set_ringparam = cpsw_set_ringparam,
  };
  
  static int cpsw_probe_dt(struct cpsw_platform_data *data,
  			 struct platform_device *pdev)
  {
  	struct device_node *node = pdev->dev.of_node;
  	struct device_node *slave_node;
  	int i = 0, ret;
  	u32 prop;
  
  	if (!node)
  		return -EINVAL;
  
  	if (of_property_read_u32(node, "slaves", &prop)) {
  		dev_err(&pdev->dev, "Missing slaves property in the DT.\n");
  		return -EINVAL;
  	}
  	data->slaves = prop;
  
  	if (of_property_read_u32(node, "active_slave", &prop)) {
  		dev_err(&pdev->dev, "Missing active_slave property in the DT.\n");
  		return -EINVAL;
  	}
  	data->active_slave = prop;
  
  	data->slave_data = devm_kcalloc(&pdev->dev,
  					data->slaves,
  					sizeof(struct cpsw_slave_data),
  					GFP_KERNEL);
  	if (!data->slave_data)
  		return -ENOMEM;
  
  	if (of_property_read_u32(node, "cpdma_channels", &prop)) {
  		dev_err(&pdev->dev, "Missing cpdma_channels property in the DT.\n");
  		return -EINVAL;
  	}
  	data->channels = prop;
  
  	if (of_property_read_u32(node, "bd_ram_size", &prop)) {
  		dev_err(&pdev->dev, "Missing bd_ram_size property in the DT.\n");
  		return -EINVAL;
  	}
  	data->bd_ram_size = prop;
  
  	if (of_property_read_u32(node, "mac_control", &prop)) {
  		dev_err(&pdev->dev, "Missing mac_control property in the DT.\n");
  		return -EINVAL;
  	}
  	data->mac_control = prop;
  
  	if (of_property_read_bool(node, "dual_emac"))
  		data->dual_emac = true;
  
  	/*
  	 * Populate all the child nodes here...
  	 */
  	ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
  	/* We do not want to force this, as in some cases may not have child */
  	if (ret)
  		dev_warn(&pdev->dev, "Doesn't have any child node\n");
  
  	for_each_available_child_of_node(node, slave_node) {
  		struct cpsw_slave_data *slave_data = data->slave_data + i;
  		int lenp;
  		const __be32 *parp;
  
  		/* This is no slave child node, continue */
  		if (!of_node_name_eq(slave_node, "slave"))
  			continue;
  
  		slave_data->ifphy = devm_of_phy_get(&pdev->dev, slave_node,
  						    NULL);
  		if (!IS_ENABLED(CONFIG_TI_CPSW_PHY_SEL) &&
  		    IS_ERR(slave_data->ifphy)) {
  			ret = PTR_ERR(slave_data->ifphy);
  			dev_err(&pdev->dev,
  				"%d: Error retrieving port phy: %d\n", i, ret);
  			goto err_node_put;
  		}
  
  		slave_data->slave_node = slave_node;
  		slave_data->phy_node = of_parse_phandle(slave_node,
  							"phy-handle", 0);
  		parp = of_get_property(slave_node, "phy_id", &lenp);
  		if (slave_data->phy_node) {
  			dev_dbg(&pdev->dev,
  				"slave[%d] using phy-handle=\"%pOF\"\n",
  				i, slave_data->phy_node);
  		} else if (of_phy_is_fixed_link(slave_node)) {
  			/* In the case of a fixed PHY, the DT node associated
  			 * to the PHY is the Ethernet MAC DT node.
  			 */
  			ret = of_phy_register_fixed_link(slave_node);
  			if (ret) {
  				if (ret != -EPROBE_DEFER)
  					dev_err(&pdev->dev, "failed to register fixed-link phy: %d\n", ret);
  				goto err_node_put;
  			}
  			slave_data->phy_node = of_node_get(slave_node);
  		} else if (parp) {
  			u32 phyid;
  			struct device_node *mdio_node;
  			struct platform_device *mdio;
  
  			if (lenp != (sizeof(__be32) * 2)) {
  				dev_err(&pdev->dev, "Invalid slave[%d] phy_id property\n", i);
  				goto no_phy_slave;
  			}
  			mdio_node = of_find_node_by_phandle(be32_to_cpup(parp));
  			phyid = be32_to_cpup(parp+1);
  			mdio = of_find_device_by_node(mdio_node);
  			of_node_put(mdio_node);
  			if (!mdio) {
  				dev_err(&pdev->dev, "Missing mdio platform device\n");
  				ret = -EINVAL;
  				goto err_node_put;
  			}
  			snprintf(slave_data->phy_id, sizeof(slave_data->phy_id),
  				 PHY_ID_FMT, mdio->name, phyid);
  			put_device(&mdio->dev);
  		} else {
  			dev_err(&pdev->dev,
  				"No slave[%d] phy_id, phy-handle, or fixed-link property\n",
  				i);
  			goto no_phy_slave;
  		}
  		ret = of_get_phy_mode(slave_node, &slave_data->phy_if);
  		if (ret) {
  			dev_err(&pdev->dev, "Missing or malformed slave[%d] phy-mode property\n",
  				i);
  			goto err_node_put;
  		}
  
  no_phy_slave:
  		ret = of_get_mac_address(slave_node, slave_data->mac_addr);
  		if (ret) {
  			ret = ti_cm_get_macid(&pdev->dev, i,
  					      slave_data->mac_addr);
  			if (ret)
  				goto err_node_put;
  		}
  		if (data->dual_emac) {
  			if (of_property_read_u32(slave_node, "dual_emac_res_vlan",
  						 &prop)) {
  				dev_err(&pdev->dev, "Missing dual_emac_res_vlan in DT.\n");
  				slave_data->dual_emac_res_vlan = i+1;
  				dev_err(&pdev->dev, "Using %d as Reserved VLAN for %d slave\n",
  					slave_data->dual_emac_res_vlan, i);
  			} else {
  				slave_data->dual_emac_res_vlan = prop;
  			}
  		}
  
  		i++;
  		if (i == data->slaves) {
  			ret = 0;
  			goto err_node_put;
  		}
  	}
  
  	return 0;
  
  err_node_put:
  	of_node_put(slave_node);
  	return ret;
  }
  
  static void cpsw_remove_dt(struct platform_device *pdev)
  {
  	struct cpsw_common *cpsw = platform_get_drvdata(pdev);
  	struct cpsw_platform_data *data = &cpsw->data;
  	struct device_node *node = pdev->dev.of_node;
  	struct device_node *slave_node;
  	int i = 0;
  
  	for_each_available_child_of_node(node, slave_node) {
  		struct cpsw_slave_data *slave_data = &data->slave_data[i];
  
  		if (!of_node_name_eq(slave_node, "slave"))
  			continue;
  
  		if (of_phy_is_fixed_link(slave_node))
  			of_phy_deregister_fixed_link(slave_node);
  
  		of_node_put(slave_data->phy_node);
  
  		i++;
  		if (i == data->slaves) {
  			of_node_put(slave_node);
  			break;
  		}
  	}
  
  	of_platform_depopulate(&pdev->dev);
  }
  
  static int cpsw_probe_dual_emac(struct cpsw_priv *priv)
  {
  	struct cpsw_common		*cpsw = priv->cpsw;
  	struct cpsw_platform_data	*data = &cpsw->data;
  	struct net_device		*ndev;
  	struct cpsw_priv		*priv_sl2;
  	int ret = 0;
  
  	ndev = devm_alloc_etherdev_mqs(cpsw->dev, sizeof(struct cpsw_priv),
  				       CPSW_MAX_QUEUES, CPSW_MAX_QUEUES);
  	if (!ndev) {
  		dev_err(cpsw->dev, "cpsw: error allocating net_device\n");
  		return -ENOMEM;
  	}
  
  	priv_sl2 = netdev_priv(ndev);
  	priv_sl2->cpsw = cpsw;
  	priv_sl2->ndev = ndev;
  	priv_sl2->dev  = &ndev->dev;
  	priv_sl2->msg_enable = netif_msg_init(debug_level, CPSW_DEBUG);
  
  	if (is_valid_ether_addr(data->slave_data[1].mac_addr)) {
  		memcpy(priv_sl2->mac_addr, data->slave_data[1].mac_addr,
  			ETH_ALEN);
  		dev_info(cpsw->dev, "cpsw: Detected MACID = %pM\n",
  			 priv_sl2->mac_addr);
  	} else {
  		eth_random_addr(priv_sl2->mac_addr);
  		dev_info(cpsw->dev, "cpsw: Random MACID = %pM\n",
  			 priv_sl2->mac_addr);
  	}
  	memcpy(ndev->dev_addr, priv_sl2->mac_addr, ETH_ALEN);
  
  	priv_sl2->emac_port = 1;
  	cpsw->slaves[1].ndev = ndev;
  	ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_CTAG_RX;
  
  	ndev->netdev_ops = &cpsw_netdev_ops;
  	ndev->ethtool_ops = &cpsw_ethtool_ops;
  
  	/* register the network device */
  	SET_NETDEV_DEV(ndev, cpsw->dev);
  	ndev->dev.of_node = cpsw->slaves[1].data->slave_node;
  	ret = register_netdev(ndev);
  	if (ret)
  		dev_err(cpsw->dev, "cpsw: error registering net device\n");
  
  	return ret;
  }
  
  static const struct of_device_id cpsw_of_mtable[] = {
  	{ .compatible = "ti,cpsw"},
  	{ .compatible = "ti,am335x-cpsw"},
  	{ .compatible = "ti,am4372-cpsw"},
  	{ .compatible = "ti,dra7-cpsw"},
  	{ /* sentinel */ },
  };
  MODULE_DEVICE_TABLE(of, cpsw_of_mtable);
  
  static const struct soc_device_attribute cpsw_soc_devices[] = {
  	{ .family = "AM33xx", .revision = "ES1.0"},
  	{ /* sentinel */ }
  };
  
  static int cpsw_probe(struct platform_device *pdev)
  {
  	struct device			*dev = &pdev->dev;
  	struct clk			*clk;
  	struct cpsw_platform_data	*data;
  	struct net_device		*ndev;
  	struct cpsw_priv		*priv;
  	void __iomem			*ss_regs;
  	struct resource			*ss_res;
  	struct gpio_descs		*mode;
  	const struct soc_device_attribute *soc;
  	struct cpsw_common		*cpsw;
  	int ret = 0, ch;
  	int irq;
  
  	cpsw = devm_kzalloc(dev, sizeof(struct cpsw_common), GFP_KERNEL);
  	if (!cpsw)
  		return -ENOMEM;
  
  	platform_set_drvdata(pdev, cpsw);
  	cpsw_slave_index = cpsw_slave_index_priv;
  
  	cpsw->dev = dev;
  
  	mode = devm_gpiod_get_array_optional(dev, "mode", GPIOD_OUT_LOW);
  	if (IS_ERR(mode)) {
  		ret = PTR_ERR(mode);
  		dev_err(dev, "gpio request failed, ret %d\n", ret);
  		return ret;
  	}
  
  	clk = devm_clk_get(dev, "fck");
  	if (IS_ERR(clk)) {
  		ret = PTR_ERR(clk);
  		dev_err(dev, "fck is not found %d\n", ret);
  		return ret;
  	}
  	cpsw->bus_freq_mhz = clk_get_rate(clk) / 1000000;
  
  	ss_regs = devm_platform_get_and_ioremap_resource(pdev, 0, &ss_res);
  	if (IS_ERR(ss_regs))
  		return PTR_ERR(ss_regs);
  	cpsw->regs = ss_regs;
  
  	cpsw->wr_regs = devm_platform_ioremap_resource(pdev, 1);
  	if (IS_ERR(cpsw->wr_regs))
  		return PTR_ERR(cpsw->wr_regs);
  
  	/* RX IRQ */
  	irq = platform_get_irq(pdev, 1);
  	if (irq < 0)
  		return irq;
  	cpsw->irqs_table[0] = irq;
  
  	/* TX IRQ */
  	irq = platform_get_irq(pdev, 2);
  	if (irq < 0)
  		return irq;
  	cpsw->irqs_table[1] = irq;
  
  	/* get misc irq*/
  	irq = platform_get_irq(pdev, 3);
  	if (irq <= 0)
  		return irq;
  	cpsw->misc_irq = irq;
  
  	/*
  	 * This may be required here for child devices.
  	 */
  	pm_runtime_enable(dev);
  
  	/* Need to enable clocks with runtime PM api to access module
  	 * registers
  	 */
  	ret = pm_runtime_get_sync(dev);
  	if (ret < 0) {
  		pm_runtime_put_noidle(dev);
  		goto clean_runtime_disable_ret;
  	}
  
  	ret = cpsw_probe_dt(&cpsw->data, pdev);
  	if (ret)
  		goto clean_dt_ret;
  
  	soc = soc_device_match(cpsw_soc_devices);
  	if (soc)
  		cpsw->quirk_irq = true;
  
  	data = &cpsw->data;
  	cpsw->slaves = devm_kcalloc(dev,
  				    data->slaves, sizeof(struct cpsw_slave),
  				    GFP_KERNEL);
  	if (!cpsw->slaves) {
  		ret = -ENOMEM;
  		goto clean_dt_ret;
  	}
  
  	cpsw->rx_packet_max = max(rx_packet_max, CPSW_MAX_PACKET_SIZE);
  	cpsw->descs_pool_size = descs_pool_size;
  
  	ret = cpsw_init_common(cpsw, ss_regs, ale_ageout,
  			       ss_res->start + CPSW2_BD_OFFSET,
  			       descs_pool_size);
  	if (ret)
  		goto clean_dt_ret;
  
  	ch = cpsw->quirk_irq ? 0 : 7;
  	cpsw->txv[0].ch = cpdma_chan_create(cpsw->dma, ch, cpsw_tx_handler, 0);
  	if (IS_ERR(cpsw->txv[0].ch)) {
  		dev_err(dev, "error initializing tx dma channel\n");
  		ret = PTR_ERR(cpsw->txv[0].ch);
  		goto clean_cpts;
  	}
  
  	cpsw->rxv[0].ch = cpdma_chan_create(cpsw->dma, 0, cpsw_rx_handler, 1);
  	if (IS_ERR(cpsw->rxv[0].ch)) {
  		dev_err(dev, "error initializing rx dma channel\n");
  		ret = PTR_ERR(cpsw->rxv[0].ch);
  		goto clean_cpts;
  	}
  	cpsw_split_res(cpsw);
  
  	/* setup netdev */
  	ndev = devm_alloc_etherdev_mqs(dev, sizeof(struct cpsw_priv),
  				       CPSW_MAX_QUEUES, CPSW_MAX_QUEUES);
  	if (!ndev) {
  		dev_err(dev, "error allocating net_device\n");
  		ret = -ENOMEM;
  		goto clean_cpts;
  	}
  
  	priv = netdev_priv(ndev);
  	priv->cpsw = cpsw;
  	priv->ndev = ndev;
  	priv->dev  = dev;
  	priv->msg_enable = netif_msg_init(debug_level, CPSW_DEBUG);
  	priv->emac_port = 0;
  
  	if (is_valid_ether_addr(data->slave_data[0].mac_addr)) {
  		memcpy(priv->mac_addr, data->slave_data[0].mac_addr, ETH_ALEN);
  		dev_info(dev, "Detected MACID = %pM\n", priv->mac_addr);
  	} else {
  		eth_random_addr(priv->mac_addr);
  		dev_info(dev, "Random MACID = %pM\n", priv->mac_addr);
  	}
  
  	memcpy(ndev->dev_addr, priv->mac_addr, ETH_ALEN);
  
  	cpsw->slaves[0].ndev = ndev;
  
  	ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_CTAG_RX;
  
  	ndev->netdev_ops = &cpsw_netdev_ops;
  	ndev->ethtool_ops = &cpsw_ethtool_ops;
  	netif_napi_add(ndev, &cpsw->napi_rx,
  		       cpsw->quirk_irq ? cpsw_rx_poll : cpsw_rx_mq_poll,
  		       CPSW_POLL_WEIGHT);
  	netif_tx_napi_add(ndev, &cpsw->napi_tx,
  			  cpsw->quirk_irq ? cpsw_tx_poll : cpsw_tx_mq_poll,
  			  CPSW_POLL_WEIGHT);
  
  	/* register the network device */
  	SET_NETDEV_DEV(ndev, dev);
  	ndev->dev.of_node = cpsw->slaves[0].data->slave_node;
  	ret = register_netdev(ndev);
  	if (ret) {
  		dev_err(dev, "error registering net device\n");
  		ret = -ENODEV;
  		goto clean_cpts;
  	}
  
  	if (cpsw->data.dual_emac) {
  		ret = cpsw_probe_dual_emac(priv);
  		if (ret) {
  			cpsw_err(priv, probe, "error probe slave 2 emac interface\n");
  			goto clean_unregister_netdev_ret;
  		}
  	}
  
  	/* Grab RX and TX IRQs. Note that we also have RX_THRESHOLD and
  	 * MISC IRQs which are always kept disabled with this driver so
  	 * we will not request them.
  	 *
  	 * If anyone wants to implement support for those, make sure to
  	 * first request and append them to irqs_table array.
  	 */
  	ret = devm_request_irq(dev, cpsw->irqs_table[0], cpsw_rx_interrupt,
  			       0, dev_name(dev), cpsw);
  	if (ret < 0) {
  		dev_err(dev, "error attaching irq (%d)\n", ret);
  		goto clean_unregister_netdev_ret;
  	}
  
  
  	ret = devm_request_irq(dev, cpsw->irqs_table[1], cpsw_tx_interrupt,
  			       0, dev_name(&pdev->dev), cpsw);
  	if (ret < 0) {
  		dev_err(dev, "error attaching irq (%d)\n", ret);
  		goto clean_unregister_netdev_ret;
  	}
  
  	if (!cpsw->cpts)
  		goto skip_cpts;
  
  	ret = devm_request_irq(&pdev->dev, cpsw->misc_irq, cpsw_misc_interrupt,
  			       0, dev_name(&pdev->dev), cpsw);
  	if (ret < 0) {
  		dev_err(dev, "error attaching misc irq (%d)\n", ret);
  		goto clean_unregister_netdev_ret;
  	}
  
  	/* Enable misc CPTS evnt_pend IRQ */
  	cpts_set_irqpoll(cpsw->cpts, false);
  
  skip_cpts:
  	cpsw_notice(priv, probe,
  		    "initialized device (regs %pa, irq %d, pool size %d)\n",
  		    &ss_res->start, cpsw->irqs_table[0], descs_pool_size);
  
  	pm_runtime_put(&pdev->dev);
  
  	return 0;
  
  clean_unregister_netdev_ret:
  	unregister_netdev(ndev);
  clean_cpts:
  	cpts_release(cpsw->cpts);
  	cpdma_ctlr_destroy(cpsw->dma);
  clean_dt_ret:
  	cpsw_remove_dt(pdev);
  	pm_runtime_put_sync(&pdev->dev);
  clean_runtime_disable_ret:
  	pm_runtime_disable(&pdev->dev);
  	return ret;
  }
  
  static int cpsw_remove(struct platform_device *pdev)
  {
  	struct cpsw_common *cpsw = platform_get_drvdata(pdev);
  	int i, ret;
  
  	ret = pm_runtime_get_sync(&pdev->dev);
  	if (ret < 0) {
  		pm_runtime_put_noidle(&pdev->dev);
  		return ret;
  	}
  
  	for (i = 0; i < cpsw->data.slaves; i++)
  		if (cpsw->slaves[i].ndev)
  			unregister_netdev(cpsw->slaves[i].ndev);
  
  	cpts_release(cpsw->cpts);
  	cpdma_ctlr_destroy(cpsw->dma);
  	cpsw_remove_dt(pdev);
  	pm_runtime_put_sync(&pdev->dev);
  	pm_runtime_disable(&pdev->dev);
  	return 0;
  }
  
  #ifdef CONFIG_PM_SLEEP
  static int cpsw_suspend(struct device *dev)
  {
  	struct cpsw_common *cpsw = dev_get_drvdata(dev);
  	int i;
  
  	rtnl_lock();
  
  	for (i = 0; i < cpsw->data.slaves; i++)
  		if (cpsw->slaves[i].ndev)
  			if (netif_running(cpsw->slaves[i].ndev))
  				cpsw_ndo_stop(cpsw->slaves[i].ndev);
  
  	rtnl_unlock();
  
  	/* Select sleep pin state */
  	pinctrl_pm_select_sleep_state(dev);
  
  	return 0;
  }
  
  static int cpsw_resume(struct device *dev)
  {
  	struct cpsw_common *cpsw = dev_get_drvdata(dev);
  	int i;
  
  	/* Select default pin state */
  	pinctrl_pm_select_default_state(dev);
  
  	/* shut up ASSERT_RTNL() warning in netif_set_real_num_tx/rx_queues */
  	rtnl_lock();
  
  	for (i = 0; i < cpsw->data.slaves; i++)
  		if (cpsw->slaves[i].ndev)
  			if (netif_running(cpsw->slaves[i].ndev))
  				cpsw_ndo_open(cpsw->slaves[i].ndev);
  
  	rtnl_unlock();
  
  	return 0;
  }
  #endif
  
  static SIMPLE_DEV_PM_OPS(cpsw_pm_ops, cpsw_suspend, cpsw_resume);
  
  static struct platform_driver cpsw_driver = {
  	.driver = {
  		.name	 = "cpsw",
  		.pm	 = &cpsw_pm_ops,
  		.of_match_table = cpsw_of_mtable,
  	},
  	.probe = cpsw_probe,
  	.remove = cpsw_remove,
  };
  
  module_platform_driver(cpsw_driver);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Cyril Chemparathy <cyril@ti.com>");
  MODULE_AUTHOR("Mugunthan V N <mugunthanvnm@ti.com>");
  MODULE_DESCRIPTION("TI CPSW Ethernet driver");
  