own_cpsw.c

// 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/filter.h>
#include <linux/net_switch_config.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 tx_packet_min = CPSW_MIN_PACKET_SIZE;
module_param(tx_packet_min, int, 0444);
MODULE_PARM_DESC(tx_packet_min, "minimum tx 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)
{   
        pr_info("calling rx_handler function\n");
	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) {
		if (status & CPDMA_RX_VLAN_ENCAP) {
			xdp.data = pa + CPSW_HEADROOM +
				   CPSW_RX_VLAN_ENCAP_HDR_SIZE;
			xdp.data_end = xdp.data + len -
				       CPSW_RX_VLAN_ENCAP_HDR_SIZE;
		} else {
			xdp.data = pa + CPSW_HEADROOM;
			xdp.data_end = xdp.data + len;
		}

		xdp_set_data_meta_invalid(&xdp);

		xdp.data_hard_start = pa;
		xdp.rxq = &priv->xdp_rxq[ch];
		xdp.frame_sz = PAGE_SIZE;

		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 */
	pr_info("Building skb \n");
	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);

        /* DEBUG GOES HERE */
        pr_info("RX skb: len=%u headroom=%u tailroom=%u proto=0x%04x\n",
        skb->len,
        skb_headroom(skb),
        skb_tailroom(skb),
        ntohs(skb->protocol));
        struct ethhdr *eth = eth_hdr(skb);

        pr_info("ETH: src=%pM dst=%pM proto=0x%04x\n",
        eth->h_source,
        eth->h_dest,
        ntohs(eth->h_proto));

	/* unmap page as no netstack skb page recycling */
	page_pool_release_page(pool, page);
	pr_info("Calling netif_receive funciton to move packet to l3\n");
	
	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,
				     priv->port_state[slave_port]);

		*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);
	priv->port_state[slave_port] = ALE_PORT_STATE_FORWARD;

	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)
{
    /* Called when interface is brought UP */
    pr_info("Calling ndo open function\n");

    /* Per-interface private data */
    struct cpsw_priv *priv = netdev_priv(ndev);

    /* Common CPSW structure (shared HW) */
    struct cpsw_common *cpsw = priv->cpsw;

    int ret;
    u32 reg;

    /* ---- POWER MANAGEMENT ---- */

    /* Power up CPSW hardware via runtime PM */
    ret = pm_runtime_get_sync(cpsw->dev);
    if (ret < 0) {
        pm_runtime_put_noidle(cpsw->dev);
        return ret;
    }

    /* Mark link as DOWN initially (until PHY reports link) */
    netif_carrier_off(ndev);

    /* ---- NETWORK QUEUE SETUP ---- */

    /* Tell netstack how many TX queues driver really has */
    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;
    }

    /* Tell netstack how many RX queues driver really has */
    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;
    }

    /* ---- VERSION LOGGING ---- */

    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));

    /* ---- PORT INITIALIZATION ---- */

    /* Initialize host port only once (shared HW) */
    if (!cpsw->usage_count)
        cpsw_init_host_port(priv);

    /* Initialize slave ports (MAC ports) */
    for_each_slave(priv, cpsw_slave_open, priv);

    /* ---- VLAN / ALE SETUP ---- */

    /* Add default VLAN depending on mode */
    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);

    /* ---- SHARED RESOURCE INIT (ONLY ON FIRST OPEN) ---- */

    if (!cpsw->usage_count) {

        /* Disable priority elevation */
        writel_relaxed(0, &cpsw->regs->ptype);

        /* Enable statistics collection on all ports */
        writel_relaxed(0x7, &cpsw->regs->stat_port_en);

        /* Enable internal FIFO flow control */
        writel(0x7, &cpsw->regs->flow_control);

        /* Enable NAPI instances (RX and TX bottom halves) */
        napi_enable(&cpsw->napi_rx);
        napi_enable(&cpsw->napi_tx);

        /* Re-enable TX IRQ if previously disabled */
        if (cpsw->tx_irq_disabled) {
            cpsw->tx_irq_disabled = false;
            enable_irq(cpsw->irqs_table[1]);
        }

        /* Re-enable RX IRQ if previously disabled */
        if (cpsw->rx_irq_disabled) {
            cpsw->rx_irq_disabled = false;
            enable_irq(cpsw->irqs_table[0]);
        }

        /* Create XDP RX queues (for fast path processing) */
        ret = cpsw_create_xdp_rxqs(cpsw);
        if (ret < 0)
            goto err_cleanup;

        /* ---- RX BUFFER INITIALIZATION (IMPORTANT) ---- */

        /* Allocate RX buffers and post them to CPDMA RX ring */
        ret = cpsw_fill_rx_channels(priv);
        if (ret < 0)
            goto err_cleanup;

        /* ---- TIMESTAMPING SUPPORT ---- */

        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);
        }
    }

    /* Restore MAC state (filters, promisc, multicast, etc.) */
    cpsw_restore(priv);

    /* ---- INTERRUPT COALESCING (OPTIONAL) ---- */

    if (cpsw->coal_intvl != 0) {
        struct ethtool_coalesce coal;

        coal.rx_coalesce_usecs = cpsw->coal_intvl;
        cpsw_set_coalesce(ndev, &coal);
    }

    /* ---- START DMA ENGINE ---- */

    /* Enable CPDMA RX/TX engines */
    cpdma_ctlr_start(cpsw->dma);

    /* Enable CPSW interrupts */
    cpsw_intr_enable(cpsw);

    /* Increase usage count (shared HW reference) */
    cpsw->usage_count++;

    return 0;
}

err_cleanup:
	if (!cpsw->usage_count) {
		napi_disable(&cpsw->napi_rx);
		napi_disable(&cpsw->napi_tx);
		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)
{
    /* Called when network interface is brought DOWN */
    pr_info("Calling ndo stop function\n");

    /* Get per-netdev private data */
    struct cpsw_priv *priv = netdev_priv(ndev);

    /* Get CPSW common structure (shared hardware) */
    struct cpsw_common *cpsw = priv->cpsw;

    /* Driver log: interface is going down */
    cpsw_info(priv, ifdown, "shutting down cpsw device\n");

    /* ---- Multicast Filter Cleanup ---- */

    /* Remove all multicast addresses associated with this netdev
     * from ALE (Address Lookup Engine)
     */
    __hw_addr_ref_unsync_dev(&ndev->mc, ndev, cpsw_purge_all_mc);

    /* ---- Stop Network Transmission ---- */

    /* Stop all TX queues so upper layers stop sending packets */
    netif_tx_stop_all_queues(priv->ndev);

    /* Mark link as DOWN (carrier lost) */
    netif_carrier_off(priv->ndev);

    /* ---- Stop Shared CPSW Hardware (only once) ---- */
    if (cpsw->usage_count <= 1) {

        /* Disable RX NAPI polling */
        napi_disable(&cpsw->napi_rx);

        /* Disable TX completion NAPI polling */
        napi_disable(&cpsw->napi_tx);

        /* Unregister CPTS (timestamping / PTP) support */
        cpts_unregister(cpsw->cpts);

        /* Disable CPSW interrupts at hardware level */
        cpsw_intr_disable(cpsw);

        /* Stop CPDMA controller (halts TX/RX DMA engines) */
        cpdma_ctlr_stop(cpsw->dma);

        /* Stop ALE (MAC learning, VLAN, multicast filtering) */
        cpsw_ale_stop(cpsw->ale);

        /* Destroy XDP RX queues if XDP was enabled */
        cpsw_destroy_xdp_rxqs(cpsw);
    }

    /* ---- Stop Per-Port (Slave) Logic ---- */

    /* Stop CPSW slave ports (PHY, MAC port, link handling) */
    for_each_slave(priv, cpsw_slave_stop, cpsw);

    /* ---- Resource Reconfiguration ---- */

    /* Restore resource split if CPSW was in dual-EMAC mode */
    if (cpsw_need_resplit(cpsw))
        cpsw_split_res(cpsw);

    /* Decrement number of active netdev users */
    cpsw->usage_count--;

    /* Release runtime PM reference (allow hardware to power down) */
    pm_runtime_put_sync(cpsw->dev);

    return 0;
}


static netdev_tx_t cpsw_ndo_start_xmit(struct sk_buff *skb,
				       struct net_device *ndev)
{
        pr_info("Caling ndo_start_xmit fucntion\n");
	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;
	unsigned int len;
	int ret, q_idx;

	if (skb_padto(skb, tx_packet_min)) {
		cpsw_err(priv, tx_err, "packet pad failed\n");
		ndev->stats.tx_dropped++;
		return NET_XMIT_DROP;
	}

	len = skb->len < tx_packet_min ? tx_packet_min : skb->len;

	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, drops = 0, port;

	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
		return -EINVAL;

	for (i = 0; i < n; i++) {
		xdpf = frames[i];
		if (xdpf->len < tx_packet_min) {
			xdp_return_frame_rx_napi(xdpf);
			drops++;
			continue;
		}

		port = priv->emac_port + cpsw->data.dual_emac;
		if (cpsw_xdp_tx_frame(priv, xdpf, NULL, port))
			drops++;
	}

	return n - drops;
}

#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

#include "cpsw_switch_ioctl.c"

static int cpsw_ndo_ioctl_legacy(struct net_device *dev, struct ifreq *req, int cmd)
{
	struct cpsw_priv *priv = netdev_priv(dev);
	struct cpsw_common *cpsw = priv->cpsw;
	int slave_no = cpsw_slave_index(cpsw, priv);

	if (!netif_running(dev))
		return -EINVAL;

	switch (cmd) {
	case SIOCSHWTSTAMP:
		return cpsw_hwtstamp_set(dev, req);
	case SIOCGHWTSTAMP:
		return cpsw_hwtstamp_get(dev, req);
	case SIOCSWITCHCONFIG:
		return cpsw_switch_config_ioctl(dev, req, cmd);
	}

	if (!cpsw->slaves[slave_no].phy)
		return -EOPNOTSUPP;
	return phy_mii_ioctl(cpsw->slaves[slave_no].phy, req, cmd);
}

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_do_ioctl		= cpsw_ndo_ioctl_legacy,
	.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;
		const void *mac_addr = NULL;
		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:
		mac_addr = of_get_mac_address(slave_node);
		if (!IS_ERR(mac_addr)) {
			ether_addr_copy(slave_data->mac_addr, mac_addr);
		} else {
			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)
{
    /* Debug: probe entry */
    pr_info("In the cpsw_probe function\n");

    /* Generic device pointer from platform bus */
    struct device *dev = &pdev->dev;

    /* Clock handle (used to derive bus frequency) */
    struct clk *clk;

    /* Platform data parsed from Device Tree */
    struct cpsw_platform_data *data;

    /* Linux network device (eth0) */
    struct net_device *ndev;

    /* Per-netdev private data */
    struct cpsw_priv *priv;

    /* CPSW subsystem register base */
    void __iomem *ss_regs;

    /* Memory resource for CPSW registers */
    struct resource *ss_res;

    /* Optional GPIOs to select CPSW mode */
    struct gpio_descs *mode;

    /* SoC matching info (for quirks) */
    const struct soc_device_attribute *soc;

    /* Common CPSW structure shared across ports */
    struct cpsw_common *cpsw;

    int ret = 0, ch;
    int irq;

    /* Allocate CPSW common structure (zeroed) */
    cpsw = devm_kzalloc(dev, sizeof(struct cpsw_common), GFP_KERNEL);
    if (!cpsw)
        return -ENOMEM;

    /* Store cpsw pointer in platform device */
    platform_set_drvdata(pdev, cpsw);

    /* Save global slave index (used for dual-emac setups) */
    cpsw_slave_index = cpsw_slave_index_priv;

    cpsw->dev = dev;

    /* Optional GPIOs to configure CPSW mode (RGMII/MII/etc) */
    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;
    }

    /* Get CPSW functional clock */
    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;
    }

    /* Convert clock rate to MHz (used by CPDMA shaper, etc.) */
    cpsw->bus_freq_mhz = clk_get_rate(clk) / 1000000;

    /* Get CPSW register memory region */
    ss_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

    /* Map CPSW subsystem registers */
    ss_regs = devm_ioremap_resource(dev, ss_res);
    if (IS_ERR(ss_regs))
        return PTR_ERR(ss_regs);

    cpsw->regs = ss_regs;

    /* Map CPSW wrapper registers (interrupt, pacing, misc control) */
    cpsw->wr_regs = devm_platform_ioremap_resource(pdev, 1);
    if (IS_ERR(cpsw->wr_regs))
        return PTR_ERR(cpsw->wr_regs);

    /* RX interrupt number */
    irq = platform_get_irq(pdev, 1);
    if (irq < 0)
        return irq;
    cpsw->irqs_table[0] = irq;

    /* TX interrupt number */
    irq = platform_get_irq(pdev, 2);
    if (irq < 0)
        return irq;
    cpsw->irqs_table[1] = irq;

    /* Misc interrupt (CPTS, errors, etc.) */
    irq = platform_get_irq(pdev, 3);
    if (irq <= 0)
        return irq;
    cpsw->misc_irq = irq;

    /* Enable runtime PM for CPSW */
    pm_runtime_enable(dev);

    /* Power up CPSW so registers can be accessed */
    ret = pm_runtime_get_sync(dev);
    if (ret < 0) {
        pm_runtime_put_noidle(dev);
        goto clean_runtime_disable_ret;
    }

    /* Parse Device Tree: ports, PHYs, MAC, VLAN, etc. */
    pr_info("Calling probe dt function\n");
    ret = cpsw_probe_dt(&cpsw->data, pdev);
    if (ret)
        goto clean_dt_ret;

    /* Match SoC for known hardware quirks */
    pr_info("calling soc device matching function\n");
    soc = soc_device_match(cpsw_soc_devices);
    if (soc)
        cpsw->quirk_irq = true;

    data = &cpsw->data;

    /* Allocate CPSW slave structures (ports) */
    cpsw->slaves = devm_kcalloc(dev,
                                data->slaves,
                                sizeof(struct cpsw_slave),
                                GFP_KERNEL);
    if (!cpsw->slaves) {
        ret = -ENOMEM;
        goto clean_dt_ret;
    }

    /* Max RX packet size */
    cpsw->rx_packet_max = max(rx_packet_max, CPSW_MAX_PACKET_SIZE);

    /* Descriptor pool size for CPDMA */
    cpsw->descs_pool_size = descs_pool_size;

    /* Initialize CPSW core:
     * - ALE
     * - CPDMA controller
     * - statistics
     */
    ret = cpsw_init_common(cpsw, ss_regs, ale_ageout,
                           ss_res->start + CPSW2_BD_OFFSET,
                           descs_pool_size);
    if (ret)
        goto clean_dt_ret;

    /* Select DMA channel number (depends on IRQ quirk) */
    ch = cpsw->quirk_irq ? 0 : 7;

    pr_info("Passing cpsw_rx or tx according to interrupt\n");

    /* Create TX DMA channel and attach TX completion handler */
    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;
    }

    /* Create RX DMA channel and attach RX completion handler */
    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;
    }

    /* Split CPDMA resources between channels */
    cpsw_split_res(cpsw);

    /* Allocate Linux net_device with TX/RX queues */
    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;
    }

    /* Fill private netdev structure */
    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;

    /* Set MAC address (DT or random) */
    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;

    /* Enable VLAN hardware features */
    ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER |
                      NETIF_F_HW_VLAN_CTAG_RX;

    /* Attach netdev operations and ethtool operations */
    ndev->netdev_ops = &cpsw_netdev_ops;
    ndev->ethtool_ops = &cpsw_ethtool_ops;

    /* Register RX and TX NAPI contexts */
    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 net_device with kernel */
    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;
    }

    /* Setup second netdev if dual-emac */
    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;
        }
    }

    /* Request RX interrupt (top half) */
    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;
    }

    /* Request TX interrupt */
    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;
    }

    /* Request MISC interrupt (CPTS, errors) */
    if (cpsw->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 CPTS interrupt polling */
        cpts_set_irqpoll(cpsw->cpts, false);
    }

    cpsw_notice(priv, probe,
                "initialized device (regs %pa, irq %d, pool size %d)\n",
                &ss_res->start,
                cpsw->irqs_table[0],
                descs_pool_size);

    /* Release runtime PM reference */
    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");