drivers/net/keystone_net.c - github/trini/u-boot - Gitiles

 /*
  * Ethernet driver for TI K2HK EVM.
  *
  * (C) Copyright 2012-2014
  *     Texas Instruments Incorporated, <www.ti.com>
  *
  * SPDX-License-Identifier:     GPL-2.0+
  */
 #include <common.h>
 #include <command.h>

 #include <net.h>
 #include <phy.h>
 #include <errno.h>
 #include <miiphy.h>
 #include <malloc.h>
 #include <asm/ti-common/keystone_nav.h>
 #include <asm/ti-common/keystone_net.h>
 #include <asm/ti-common/keystone_serdes.h>

 unsigned int emac_open;
 static struct mii_dev *mdio_bus;
 static unsigned int sys_has_mdio = 1;

 #ifdef KEYSTONE2_EMAC_GIG_ENABLE
 #define emac_gigabit_enable(x)	keystone2_eth_gigabit_enable(x)
 #else
 #define emac_gigabit_enable(x)	/* no gigabit to enable */
 #endif

 #define RX_BUFF_NUMS	24
 #define RX_BUFF_LEN	1520
 #define MAX_SIZE_STREAM_BUFFER RX_BUFF_LEN
 #define SGMII_ANEG_TIMEOUT		4000

 static u8 rx_buffs[RX_BUFF_NUMS * RX_BUFF_LEN] __aligned(16);

 struct rx_buff_desc net_rx_buffs = {
 	.buff_ptr	= rx_buffs,
 	.num_buffs	= RX_BUFF_NUMS,
 	.buff_len	= RX_BUFF_LEN,
 	.rx_flow	= 22,
 };

 static void keystone2_net_serdes_setup(void);

 int keystone2_eth_read_mac_addr(struct eth_device *dev)
 {
 	struct eth_priv_t *eth_priv;
 	u32 maca = 0;
 	u32 macb = 0;

 	eth_priv = (struct eth_priv_t *)dev->priv;

 	/* Read the e-fuse mac address */
 	if (eth_priv->slave_port == 1) {
 		maca = __raw_readl(MAC_ID_BASE_ADDR);
 		macb = __raw_readl(MAC_ID_BASE_ADDR + 4);
 	}

 	dev->enetaddr[0] = (macb >>  8) & 0xff;
 	dev->enetaddr[1] = (macb >>  0) & 0xff;
 	dev->enetaddr[2] = (maca >> 24) & 0xff;
 	dev->enetaddr[3] = (maca >> 16) & 0xff;
 	dev->enetaddr[4] = (maca >>  8) & 0xff;
 	dev->enetaddr[5] = (maca >>  0) & 0xff;

 	return 0;
 }

 /* MDIO */

 static int keystone2_mdio_reset(struct mii_dev *bus)
 {
 	u_int32_t clkdiv;
 	struct mdio_regs *adap_mdio = bus->priv;

 	clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;

 	writel((clkdiv & 0xffff) | MDIO_CONTROL_ENABLE |
 	       MDIO_CONTROL_FAULT | MDIO_CONTROL_FAULT_ENABLE,
 	       &adap_mdio->control);

 	while (readl(&adap_mdio->control) & MDIO_CONTROL_IDLE)
 		;

 	return 0;
 }

 /**
  * keystone2_mdio_read - read a PHY register via MDIO interface.
  * Blocks until operation is complete.
  */
 static int keystone2_mdio_read(struct mii_dev *bus,
 			       int addr, int devad, int reg)
 {
 	int tmp;
 	struct mdio_regs *adap_mdio = bus->priv;

 	while (readl(&adap_mdio->useraccess0) & MDIO_USERACCESS0_GO)
 		;

 	writel(MDIO_USERACCESS0_GO | MDIO_USERACCESS0_WRITE_READ |
 	       ((reg & 0x1f) << 21) | ((addr & 0x1f) << 16),
 	       &adap_mdio->useraccess0);

 	/* Wait for command to complete */
 	while ((tmp = readl(&adap_mdio->useraccess0)) & MDIO_USERACCESS0_GO)
 		;

 	if (tmp & MDIO_USERACCESS0_ACK)
 		return tmp & 0xffff;

 	return -1;
 }

 /**
  * keystone2_mdio_write - write to a PHY register via MDIO interface.
  * Blocks until operation is complete.
  */
 static int keystone2_mdio_write(struct mii_dev *bus,
 				int addr, int devad, int reg, u16 val)
 {
 	struct mdio_regs *adap_mdio = bus->priv;

 	while (readl(&adap_mdio->useraccess0) & MDIO_USERACCESS0_GO)
 		;

 	writel(MDIO_USERACCESS0_GO | MDIO_USERACCESS0_WRITE_WRITE |
 	       ((reg & 0x1f) << 21) | ((addr & 0x1f) << 16) |
 	       (val & 0xffff), &adap_mdio->useraccess0);

 	/* Wait for command to complete */
 	while (readl(&adap_mdio->useraccess0) & MDIO_USERACCESS0_GO)
 		;

 	return 0;
 }

 static void  __attribute__((unused))
 	keystone2_eth_gigabit_enable(struct eth_device *dev)
 {
 	u_int16_t data;
 	struct eth_priv_t *eth_priv = (struct eth_priv_t *)dev->priv;

 	if (sys_has_mdio) {
 		data = keystone2_mdio_read(mdio_bus, eth_priv->phy_addr,
 					   MDIO_DEVAD_NONE, 0);
 		/* speed selection MSB */
 		if (!(data & (1 << 6)))
 			return;
 	}

 	/*
 	 * Check if link detected is giga-bit
 	 * If Gigabit mode detected, enable gigbit in MAC
 	 */
 	writel(readl(DEVICE_EMACSL_BASE(eth_priv->slave_port - 1) +
 		     CPGMACSL_REG_CTL) |
 	       EMAC_MACCONTROL_GIGFORCE | EMAC_MACCONTROL_GIGABIT_ENABLE,
 	       DEVICE_EMACSL_BASE(eth_priv->slave_port - 1) + CPGMACSL_REG_CTL);
 }

 int keystone_sgmii_link_status(int port)
 {
 	u32 status = 0;

 	status = __raw_readl(SGMII_STATUS_REG(port));

 	return (status & SGMII_REG_STATUS_LOCK) &&
 	       (status & SGMII_REG_STATUS_LINK);
 }

 int keystone_sgmii_config(struct phy_device *phy_dev, int port, int interface)
 {
 	unsigned int i, status, mask;
 	unsigned int mr_adv_ability, control;

 	switch (interface) {
 	case SGMII_LINK_MAC_MAC_AUTONEG:
 		mr_adv_ability	= (SGMII_REG_MR_ADV_ENABLE |
 				   SGMII_REG_MR_ADV_LINK |
 				   SGMII_REG_MR_ADV_FULL_DUPLEX |
 				   SGMII_REG_MR_ADV_GIG_MODE);
 		control		= (SGMII_REG_CONTROL_MASTER |
 				   SGMII_REG_CONTROL_AUTONEG);

 		break;
 	case SGMII_LINK_MAC_PHY:
 	case SGMII_LINK_MAC_PHY_FORCED:
 		mr_adv_ability	= SGMII_REG_MR_ADV_ENABLE;
 		control		= SGMII_REG_CONTROL_AUTONEG;

 		break;
 	case SGMII_LINK_MAC_MAC_FORCED:
 		mr_adv_ability	= (SGMII_REG_MR_ADV_ENABLE |
 				   SGMII_REG_MR_ADV_LINK |
 				   SGMII_REG_MR_ADV_FULL_DUPLEX |
 				   SGMII_REG_MR_ADV_GIG_MODE);
 		control		= SGMII_REG_CONTROL_MASTER;

 		break;
 	case SGMII_LINK_MAC_FIBER:
 		mr_adv_ability	= 0x20;
 		control		= SGMII_REG_CONTROL_AUTONEG;

 		break;
 	default:
 		mr_adv_ability	= SGMII_REG_MR_ADV_ENABLE;
 		control		= SGMII_REG_CONTROL_AUTONEG;
 	}

 	__raw_writel(0, SGMII_CTL_REG(port));

 	/*
 	 * Wait for the SerDes pll to lock,
 	 * but don't trap if lock is never read
 	 */
 	for (i = 0; i < 1000; i++)  {
 		udelay(2000);
 		status = __raw_readl(SGMII_STATUS_REG(port));
 		if ((status & SGMII_REG_STATUS_LOCK) != 0)
 			break;
 	}

 	__raw_writel(mr_adv_ability, SGMII_MRADV_REG(port));
 	__raw_writel(control, SGMII_CTL_REG(port));


 	mask = SGMII_REG_STATUS_LINK;

 	if (control & SGMII_REG_CONTROL_AUTONEG)
 		mask |= SGMII_REG_STATUS_AUTONEG;

 	status = __raw_readl(SGMII_STATUS_REG(port));
 	if ((status & mask) == mask)
 		return 0;

 	printf("\n%s Waiting for SGMII auto negotiation to complete",
 	       phy_dev->dev->name);
 	while ((status & mask) != mask) {
 		/*
 		 * Timeout reached ?
 		 */
 		if (i > SGMII_ANEG_TIMEOUT) {
 			puts(" TIMEOUT !\n");
 			phy_dev->link = 0;
 			return 0;
 		}

 		if (ctrlc()) {
 			puts("user interrupt!\n");
 			phy_dev->link = 0;
 			return -EINTR;
 		}

 		if ((i++ % 500) == 0)
 			printf(".");

 		udelay(1000);   /* 1 ms */
 		status = __raw_readl(SGMII_STATUS_REG(port));
 	}
 	puts(" done\n");

 	return 0;
 }

 int mac_sl_reset(u32 port)
 {
 	u32 i, v;

 	if (port >= DEVICE_N_GMACSL_PORTS)
 		return GMACSL_RET_INVALID_PORT;

 	/* Set the soft reset bit */
 	writel(CPGMAC_REG_RESET_VAL_RESET,
 	       DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_RESET);

 	/* Wait for the bit to clear */
 	for (i = 0; i < DEVICE_EMACSL_RESET_POLL_COUNT; i++) {
 		v = readl(DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_RESET);
 		if ((v & CPGMAC_REG_RESET_VAL_RESET_MASK) !=
 		    CPGMAC_REG_RESET_VAL_RESET)
 			return GMACSL_RET_OK;
 	}

 	/* Timeout on the reset */
 	return GMACSL_RET_WARN_RESET_INCOMPLETE;
 }

 int mac_sl_config(u_int16_t port, struct mac_sl_cfg *cfg)
 {
 	u32 v, i;
 	int ret = GMACSL_RET_OK;

 	if (port >= DEVICE_N_GMACSL_PORTS)
 		return GMACSL_RET_INVALID_PORT;

 	if (cfg->max_rx_len > CPGMAC_REG_MAXLEN_LEN) {
 		cfg->max_rx_len = CPGMAC_REG_MAXLEN_LEN;
 		ret = GMACSL_RET_WARN_MAXLEN_TOO_BIG;
 	}

 	/* Must wait if the device is undergoing reset */
 	for (i = 0; i < DEVICE_EMACSL_RESET_POLL_COUNT; i++) {
 		v = readl(DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_RESET);
 		if ((v & CPGMAC_REG_RESET_VAL_RESET_MASK) !=
 		    CPGMAC_REG_RESET_VAL_RESET)
 			break;
 	}

 	if (i == DEVICE_EMACSL_RESET_POLL_COUNT)
 		return GMACSL_RET_CONFIG_FAIL_RESET_ACTIVE;

 	writel(cfg->max_rx_len, DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_MAXLEN);
 	writel(cfg->ctl, DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_CTL);

 #if defined(CONFIG_SOC_K2E) || defined(CONFIG_SOC_K2L)
 	/* Map RX packet flow priority to 0 */
 	writel(0, DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_RX_PRI_MAP);
 #endif

 	return ret;
 }

 int ethss_config(u32 ctl, u32 max_pkt_size)
 {
 	u32 i;

 	/* Max length register */
 	writel(max_pkt_size, DEVICE_CPSW_BASE + CPSW_REG_MAXLEN);

 	/* Control register */
 	writel(ctl, DEVICE_CPSW_BASE + CPSW_REG_CTL);

 	/* All statistics enabled by default */
 	writel(CPSW_REG_VAL_STAT_ENABLE_ALL,
 	       DEVICE_CPSW_BASE + CPSW_REG_STAT_PORT_EN);

 	/* Reset and enable the ALE */
 	writel(CPSW_REG_VAL_ALE_CTL_RESET_AND_ENABLE |
 	       CPSW_REG_VAL_ALE_CTL_BYPASS,
 	       DEVICE_CPSW_BASE + CPSW_REG_ALE_CONTROL);

 	/* All ports put into forward mode */
 	for (i = 0; i < DEVICE_CPSW_NUM_PORTS; i++)
 		writel(CPSW_REG_VAL_PORTCTL_FORWARD_MODE,
 		       DEVICE_CPSW_BASE + CPSW_REG_ALE_PORTCTL(i));

 	return 0;
 }

 int ethss_start(void)
 {
 	int i;
 	struct mac_sl_cfg cfg;

 	cfg.max_rx_len	= MAX_SIZE_STREAM_BUFFER;
 	cfg.ctl		= GMACSL_ENABLE | GMACSL_RX_ENABLE_EXT_CTL;

 	for (i = 0; i < DEVICE_N_GMACSL_PORTS; i++) {
 		mac_sl_reset(i);
 		mac_sl_config(i, &cfg);
 	}

 	return 0;
 }

 int ethss_stop(void)
 {
 	int i;

 	for (i = 0; i < DEVICE_N_GMACSL_PORTS; i++)
 		mac_sl_reset(i);

 	return 0;
 }

 int32_t cpmac_drv_send(u32 *buffer, int num_bytes, int slave_port_num)
 {
 	if (num_bytes < EMAC_MIN_ETHERNET_PKT_SIZE)
 		num_bytes = EMAC_MIN_ETHERNET_PKT_SIZE;

 	return ksnav_send(&netcp_pktdma, buffer,
 			  num_bytes, (slave_port_num) << 16);
 }

 /* Eth device open */
 static int keystone2_eth_open(struct eth_device *dev, bd_t *bis)
 {
 	struct eth_priv_t *eth_priv = (struct eth_priv_t *)dev->priv;
 	struct phy_device *phy_dev = eth_priv->phy_dev;

 	debug("+ emac_open\n");

 	net_rx_buffs.rx_flow	= eth_priv->rx_flow;

 	sys_has_mdio =
 		(eth_priv->sgmii_link_type == SGMII_LINK_MAC_PHY) ? 1 : 0;

 	if (sys_has_mdio)
 		keystone2_mdio_reset(mdio_bus);

 	keystone_sgmii_config(phy_dev, eth_priv->slave_port - 1,
 			      eth_priv->sgmii_link_type);

 	udelay(10000);

 	/* On chip switch configuration */
 	ethss_config(target_get_switch_ctl(), SWITCH_MAX_PKT_SIZE);

 	/* TODO: add error handling code */
 	if (qm_init()) {
 		printf("ERROR: qm_init()\n");
 		return -1;
 	}
 	if (ksnav_init(&netcp_pktdma, &net_rx_buffs)) {
 		qm_close();
 		printf("ERROR: netcp_init()\n");
 		return -1;
 	}

 	/*
 	 * Streaming switch configuration. If not present this
 	 * statement is defined to void in target.h.
 	 * If present this is usually defined to a series of register writes
 	 */
 	hw_config_streaming_switch();

 	if (sys_has_mdio) {
 		keystone2_mdio_reset(mdio_bus);

 		phy_startup(phy_dev);
 		if (phy_dev->link == 0) {
 			ksnav_close(&netcp_pktdma);
 			qm_close();
 			return -1;
 		}
 	}

 	emac_gigabit_enable(dev);

 	ethss_start();

 	debug("- emac_open\n");

 	emac_open = 1;

 	return 0;
 }

 /* Eth device close */
 void keystone2_eth_close(struct eth_device *dev)
 {
 	struct eth_priv_t *eth_priv = (struct eth_priv_t *)dev->priv;
 	struct phy_device *phy_dev = eth_priv->phy_dev;

 	debug("+ emac_close\n");

 	if (!emac_open)
 		return;

 	ethss_stop();

 	ksnav_close(&netcp_pktdma);
 	qm_close();
 	phy_shutdown(phy_dev);

 	emac_open = 0;

 	debug("- emac_close\n");
 }

 /*
  * This function sends a single packet on the network and returns
  * positive number (number of bytes transmitted) or negative for error
  */
 static int keystone2_eth_send_packet(struct eth_device *dev,
 					void *packet, int length)
 {
 	int ret_status = -1;
 	struct eth_priv_t *eth_priv = (struct eth_priv_t *)dev->priv;
 	struct phy_device *phy_dev = eth_priv->phy_dev;

 	genphy_update_link(phy_dev);
 	if (phy_dev->link == 0)
 		return -1;

 	if (cpmac_drv_send((u32 *)packet, length, eth_priv->slave_port) != 0)
 		return ret_status;

 	return length;
 }

 /*
  * This function handles receipt of a packet from the network
  */
 static int keystone2_eth_rcv_packet(struct eth_device *dev)
 {
 	void *hd;
 	int  pkt_size;
 	u32  *pkt;

 	hd = ksnav_recv(&netcp_pktdma, &pkt, &pkt_size);
 	if (hd == NULL)
 		return 0;

 	NetReceive((uchar *)pkt, pkt_size);

 	ksnav_release_rxhd(&netcp_pktdma, hd);

 	return pkt_size;
 }

 /*
  * This function initializes the EMAC hardware.
  */
 int keystone2_emac_initialize(struct eth_priv_t *eth_priv)
 {
 	int res;
 	struct eth_device *dev;
 	struct phy_device *phy_dev;

 	dev = malloc(sizeof(struct eth_device));
 	if (dev == NULL)
 		return -1;

 	memset(dev, 0, sizeof(struct eth_device));

 	strcpy(dev->name, eth_priv->int_name);
 	dev->priv = eth_priv;

 	keystone2_eth_read_mac_addr(dev);

 	dev->iobase		= 0;
 	dev->init		= keystone2_eth_open;
 	dev->halt		= keystone2_eth_close;
 	dev->send		= keystone2_eth_send_packet;
 	dev->recv		= keystone2_eth_rcv_packet;

 	eth_register(dev);

 	/* Register MDIO bus if it's not registered yet */
 	if (!mdio_bus) {
 		mdio_bus	= mdio_alloc();
 		mdio_bus->read	= keystone2_mdio_read;
 		mdio_bus->write	= keystone2_mdio_write;
 		mdio_bus->reset	= keystone2_mdio_reset;
 		mdio_bus->priv	= (void *)EMAC_MDIO_BASE_ADDR;
 		sprintf(mdio_bus->name, "ethernet-mdio");

 		res = mdio_register(mdio_bus);
 		if (res)
 			return res;
 	}

 	keystone2_net_serdes_setup();

 	/* Create phy device and bind it with driver */
 #ifdef CONFIG_KSNET_MDIO_PHY_CONFIG_ENABLE
 	phy_dev = phy_connect(mdio_bus, eth_priv->phy_addr,
 			      dev, PHY_INTERFACE_MODE_SGMII);
 	phy_config(phy_dev);
 #else
 	phy_dev = phy_find_by_mask(mdio_bus, 1 << eth_priv->phy_addr,
 				   PHY_INTERFACE_MODE_SGMII);
 	phy_dev->dev = dev;
 #endif
 	eth_priv->phy_dev = phy_dev;

 	return 0;
 }

 struct ks2_serdes ks2_serdes_sgmii_156p25mhz = {
 	.clk = SERDES_CLOCK_156P25M,
 	.rate = SERDES_RATE_5G,
 	.rate_mode = SERDES_QUARTER_RATE,
 	.intf = SERDES_PHY_SGMII,
 	.loopback = 0,
 };

 static void keystone2_net_serdes_setup(void)
 {
 	ks2_serdes_init(CONFIG_KSNET_SERDES_SGMII_BASE,
 			&ks2_serdes_sgmii_156p25mhz,
 			CONFIG_KSNET_SERDES_LANES_PER_SGMII);

 #if defined(CONFIG_SOC_K2E) || defined(CONFIG_SOC_K2L)
 	ks2_serdes_init(CONFIG_KSNET_SERDES_SGMII2_BASE,
 			&ks2_serdes_sgmii_156p25mhz,
 			CONFIG_KSNET_SERDES_LANES_PER_SGMII);
 #endif

 	/* wait till setup */
 	udelay(5000);
 }
	/*
	* Ethernet driver for TI K2HK EVM.
	*
	* (C) Copyright 2012-2014
	* Texas Instruments Incorporated, <www.ti.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/
	#include <common.h>
	#include <command.h>

	#include <net.h>
	#include <phy.h>
	#include <errno.h>
	#include <miiphy.h>
	#include <malloc.h>
	#include <asm/ti-common/keystone_nav.h>
	#include <asm/ti-common/keystone_net.h>
	#include <asm/ti-common/keystone_serdes.h>

	unsigned int emac_open;
	static struct mii_dev *mdio_bus;
	static unsigned int sys_has_mdio = 1;

	#ifdef KEYSTONE2_EMAC_GIG_ENABLE
	#define emac_gigabit_enable(x) keystone2_eth_gigabit_enable(x)
	#else
	#define emac_gigabit_enable(x) /* no gigabit to enable */
	#endif

	#define RX_BUFF_NUMS 24
	#define RX_BUFF_LEN 1520
	#define MAX_SIZE_STREAM_BUFFER RX_BUFF_LEN
	#define SGMII_ANEG_TIMEOUT 4000

	static u8 rx_buffs[RX_BUFF_NUMS * RX_BUFF_LEN] __aligned(16);

	struct rx_buff_desc net_rx_buffs = {
	.buff_ptr = rx_buffs,
	.num_buffs = RX_BUFF_NUMS,
	.buff_len = RX_BUFF_LEN,
	.rx_flow = 22,
	};

	static void keystone2_net_serdes_setup(void);

	int keystone2_eth_read_mac_addr(struct eth_device *dev)
	{
	struct eth_priv_t *eth_priv;
	u32 maca = 0;
	u32 macb = 0;

	eth_priv = (struct eth_priv_t *)dev->priv;

	/* Read the e-fuse mac address */
	if (eth_priv->slave_port == 1) {
	maca = __raw_readl(MAC_ID_BASE_ADDR);
	macb = __raw_readl(MAC_ID_BASE_ADDR + 4);
	}

	dev->enetaddr[0] = (macb >> 8) & 0xff;
	dev->enetaddr[1] = (macb >> 0) & 0xff;
	dev->enetaddr[2] = (maca >> 24) & 0xff;
	dev->enetaddr[3] = (maca >> 16) & 0xff;
	dev->enetaddr[4] = (maca >> 8) & 0xff;
	dev->enetaddr[5] = (maca >> 0) & 0xff;

	return 0;
	}

	/* MDIO */

	static int keystone2_mdio_reset(struct mii_dev *bus)
	{
	u_int32_t clkdiv;
	struct mdio_regs *adap_mdio = bus->priv;

	clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;

	writel((clkdiv & 0xffff) \| MDIO_CONTROL_ENABLE \|
	MDIO_CONTROL_FAULT \| MDIO_CONTROL_FAULT_ENABLE,
	&adap_mdio->control);

	while (readl(&adap_mdio->control) & MDIO_CONTROL_IDLE)
	;

	return 0;
	}

	/**
	* keystone2_mdio_read - read a PHY register via MDIO interface.
	* Blocks until operation is complete.
	*/
	static int keystone2_mdio_read(struct mii_dev *bus,
	int addr, int devad, int reg)
	{
	int tmp;
	struct mdio_regs *adap_mdio = bus->priv;

	while (readl(&adap_mdio->useraccess0) & MDIO_USERACCESS0_GO)
	;

	writel(MDIO_USERACCESS0_GO \| MDIO_USERACCESS0_WRITE_READ \|
	((reg & 0x1f) << 21) \| ((addr & 0x1f) << 16),
	&adap_mdio->useraccess0);

	/* Wait for command to complete */
	while ((tmp = readl(&adap_mdio->useraccess0)) & MDIO_USERACCESS0_GO)
	;

	if (tmp & MDIO_USERACCESS0_ACK)
	return tmp & 0xffff;

	return -1;
	}

	/**
	* keystone2_mdio_write - write to a PHY register via MDIO interface.
	* Blocks until operation is complete.
	*/
	static int keystone2_mdio_write(struct mii_dev *bus,
	int addr, int devad, int reg, u16 val)
	{
	struct mdio_regs *adap_mdio = bus->priv;

	while (readl(&adap_mdio->useraccess0) & MDIO_USERACCESS0_GO)
	;

	writel(MDIO_USERACCESS0_GO \| MDIO_USERACCESS0_WRITE_WRITE \|
	((reg & 0x1f) << 21) \| ((addr & 0x1f) << 16) \|
	(val & 0xffff), &adap_mdio->useraccess0);

	/* Wait for command to complete */
	while (readl(&adap_mdio->useraccess0) & MDIO_USERACCESS0_GO)
	;

	return 0;
	}

	static void __attribute__((unused))
	keystone2_eth_gigabit_enable(struct eth_device *dev)
	{
	u_int16_t data;
	struct eth_priv_t eth_priv = (struct eth_priv_t )dev->priv;

	if (sys_has_mdio) {
	data = keystone2_mdio_read(mdio_bus, eth_priv->phy_addr,
	MDIO_DEVAD_NONE, 0);
	/* speed selection MSB */
	if (!(data & (1 << 6)))
	return;
	}

	/*
	* Check if link detected is giga-bit
	* If Gigabit mode detected, enable gigbit in MAC
	*/
	writel(readl(DEVICE_EMACSL_BASE(eth_priv->slave_port - 1) +
	CPGMACSL_REG_CTL) \|
	EMAC_MACCONTROL_GIGFORCE \| EMAC_MACCONTROL_GIGABIT_ENABLE,
	DEVICE_EMACSL_BASE(eth_priv->slave_port - 1) + CPGMACSL_REG_CTL);
	}

	int keystone_sgmii_link_status(int port)
	{
	u32 status = 0;

	status = __raw_readl(SGMII_STATUS_REG(port));

	return (status & SGMII_REG_STATUS_LOCK) &&
	(status & SGMII_REG_STATUS_LINK);
	}

	int keystone_sgmii_config(struct phy_device *phy_dev, int port, int interface)
	{
	unsigned int i, status, mask;
	unsigned int mr_adv_ability, control;

	switch (interface) {
	case SGMII_LINK_MAC_MAC_AUTONEG:
	mr_adv_ability = (SGMII_REG_MR_ADV_ENABLE \|
	SGMII_REG_MR_ADV_LINK \|
	SGMII_REG_MR_ADV_FULL_DUPLEX \|
	SGMII_REG_MR_ADV_GIG_MODE);
	control = (SGMII_REG_CONTROL_MASTER \|
	SGMII_REG_CONTROL_AUTONEG);

	break;
	case SGMII_LINK_MAC_PHY:
	case SGMII_LINK_MAC_PHY_FORCED:
	mr_adv_ability = SGMII_REG_MR_ADV_ENABLE;
	control = SGMII_REG_CONTROL_AUTONEG;

	break;
	case SGMII_LINK_MAC_MAC_FORCED:
	mr_adv_ability = (SGMII_REG_MR_ADV_ENABLE \|
	SGMII_REG_MR_ADV_LINK \|
	SGMII_REG_MR_ADV_FULL_DUPLEX \|
	SGMII_REG_MR_ADV_GIG_MODE);
	control = SGMII_REG_CONTROL_MASTER;

	break;
	case SGMII_LINK_MAC_FIBER:
	mr_adv_ability = 0x20;
	control = SGMII_REG_CONTROL_AUTONEG;

	break;
	default:
	mr_adv_ability = SGMII_REG_MR_ADV_ENABLE;
	control = SGMII_REG_CONTROL_AUTONEG;
	}

	__raw_writel(0, SGMII_CTL_REG(port));

	/*
	* Wait for the SerDes pll to lock,
	* but don't trap if lock is never read
	*/
	for (i = 0; i < 1000; i++) {
	udelay(2000);
	status = __raw_readl(SGMII_STATUS_REG(port));
	if ((status & SGMII_REG_STATUS_LOCK) != 0)
	break;
	}

	__raw_writel(mr_adv_ability, SGMII_MRADV_REG(port));
	__raw_writel(control, SGMII_CTL_REG(port));


	mask = SGMII_REG_STATUS_LINK;

	if (control & SGMII_REG_CONTROL_AUTONEG)
	mask \|= SGMII_REG_STATUS_AUTONEG;

	status = __raw_readl(SGMII_STATUS_REG(port));
	if ((status & mask) == mask)
	return 0;

	printf("\n%s Waiting for SGMII auto negotiation to complete",
	phy_dev->dev->name);
	while ((status & mask) != mask) {
	/*
	* Timeout reached ?
	*/
	if (i > SGMII_ANEG_TIMEOUT) {
	puts(" TIMEOUT !\n");
	phy_dev->link = 0;
	return 0;
	}

	if (ctrlc()) {
	puts("user interrupt!\n");
	phy_dev->link = 0;
	return -EINTR;
	}

	if ((i++ % 500) == 0)
	printf(".");

	udelay(1000); /* 1 ms */
	status = __raw_readl(SGMII_STATUS_REG(port));
	}
	puts(" done\n");

	return 0;
	}

	int mac_sl_reset(u32 port)
	{
	u32 i, v;

	if (port >= DEVICE_N_GMACSL_PORTS)
	return GMACSL_RET_INVALID_PORT;

	/* Set the soft reset bit */
	writel(CPGMAC_REG_RESET_VAL_RESET,
	DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_RESET);

	/* Wait for the bit to clear */
	for (i = 0; i < DEVICE_EMACSL_RESET_POLL_COUNT; i++) {
	v = readl(DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_RESET);
	if ((v & CPGMAC_REG_RESET_VAL_RESET_MASK) !=
	CPGMAC_REG_RESET_VAL_RESET)
	return GMACSL_RET_OK;
	}

	/* Timeout on the reset */
	return GMACSL_RET_WARN_RESET_INCOMPLETE;
	}

	int mac_sl_config(u_int16_t port, struct mac_sl_cfg *cfg)
	{
	u32 v, i;
	int ret = GMACSL_RET_OK;

	if (port >= DEVICE_N_GMACSL_PORTS)
	return GMACSL_RET_INVALID_PORT;

	if (cfg->max_rx_len > CPGMAC_REG_MAXLEN_LEN) {
	cfg->max_rx_len = CPGMAC_REG_MAXLEN_LEN;
	ret = GMACSL_RET_WARN_MAXLEN_TOO_BIG;
	}

	/* Must wait if the device is undergoing reset */
	for (i = 0; i < DEVICE_EMACSL_RESET_POLL_COUNT; i++) {
	v = readl(DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_RESET);
	if ((v & CPGMAC_REG_RESET_VAL_RESET_MASK) !=
	CPGMAC_REG_RESET_VAL_RESET)
	break;
	}

	if (i == DEVICE_EMACSL_RESET_POLL_COUNT)
	return GMACSL_RET_CONFIG_FAIL_RESET_ACTIVE;

	writel(cfg->max_rx_len, DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_MAXLEN);
	writel(cfg->ctl, DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_CTL);

	#if defined(CONFIG_SOC_K2E) \|\| defined(CONFIG_SOC_K2L)
	/* Map RX packet flow priority to 0 */
	writel(0, DEVICE_EMACSL_BASE(port) + CPGMACSL_REG_RX_PRI_MAP);
	#endif

	return ret;
	}

	int ethss_config(u32 ctl, u32 max_pkt_size)
	{
	u32 i;

	/* Max length register */
	writel(max_pkt_size, DEVICE_CPSW_BASE + CPSW_REG_MAXLEN);

	/* Control register */
	writel(ctl, DEVICE_CPSW_BASE + CPSW_REG_CTL);

	/* All statistics enabled by default */
	writel(CPSW_REG_VAL_STAT_ENABLE_ALL,
	DEVICE_CPSW_BASE + CPSW_REG_STAT_PORT_EN);

	/* Reset and enable the ALE */
	writel(CPSW_REG_VAL_ALE_CTL_RESET_AND_ENABLE \|
	CPSW_REG_VAL_ALE_CTL_BYPASS,
	DEVICE_CPSW_BASE + CPSW_REG_ALE_CONTROL);

	/* All ports put into forward mode */
	for (i = 0; i < DEVICE_CPSW_NUM_PORTS; i++)
	writel(CPSW_REG_VAL_PORTCTL_FORWARD_MODE,
	DEVICE_CPSW_BASE + CPSW_REG_ALE_PORTCTL(i));

	return 0;
	}

	int ethss_start(void)
	{
	int i;
	struct mac_sl_cfg cfg;

	cfg.max_rx_len = MAX_SIZE_STREAM_BUFFER;
	cfg.ctl = GMACSL_ENABLE \| GMACSL_RX_ENABLE_EXT_CTL;

	for (i = 0; i < DEVICE_N_GMACSL_PORTS; i++) {
	mac_sl_reset(i);
	mac_sl_config(i, &cfg);
	}

	return 0;
	}

	int ethss_stop(void)
	{
	int i;

	for (i = 0; i < DEVICE_N_GMACSL_PORTS; i++)
	mac_sl_reset(i);

	return 0;
	}

	int32_t cpmac_drv_send(u32 *buffer, int num_bytes, int slave_port_num)
	{
	if (num_bytes < EMAC_MIN_ETHERNET_PKT_SIZE)
	num_bytes = EMAC_MIN_ETHERNET_PKT_SIZE;

	return ksnav_send(&netcp_pktdma, buffer,
	num_bytes, (slave_port_num) << 16);
	}

	/* Eth device open */
	static int keystone2_eth_open(struct eth_device dev, bd_t bis)
	{
	struct eth_priv_t eth_priv = (struct eth_priv_t )dev->priv;
	struct phy_device *phy_dev = eth_priv->phy_dev;

	debug("+ emac_open\n");

	net_rx_buffs.rx_flow = eth_priv->rx_flow;

	sys_has_mdio =
	(eth_priv->sgmii_link_type == SGMII_LINK_MAC_PHY) ? 1 : 0;

	if (sys_has_mdio)
	keystone2_mdio_reset(mdio_bus);

	keystone_sgmii_config(phy_dev, eth_priv->slave_port - 1,
	eth_priv->sgmii_link_type);

	udelay(10000);

	/* On chip switch configuration */
	ethss_config(target_get_switch_ctl(), SWITCH_MAX_PKT_SIZE);

	/* TODO: add error handling code */
	if (qm_init()) {
	printf("ERROR: qm_init()\n");
	return -1;
	}
	if (ksnav_init(&netcp_pktdma, &net_rx_buffs)) {
	qm_close();
	printf("ERROR: netcp_init()\n");
	return -1;
	}

	/*
	* Streaming switch configuration. If not present this
	* statement is defined to void in target.h.
	* If present this is usually defined to a series of register writes
	*/
	hw_config_streaming_switch();

	if (sys_has_mdio) {
	keystone2_mdio_reset(mdio_bus);

	phy_startup(phy_dev);
	if (phy_dev->link == 0) {
	ksnav_close(&netcp_pktdma);
	qm_close();
	return -1;
	}
	}

	emac_gigabit_enable(dev);

	ethss_start();

	debug("- emac_open\n");

	emac_open = 1;

	return 0;
	}

	/* Eth device close */
	void keystone2_eth_close(struct eth_device *dev)
	{
	struct eth_priv_t eth_priv = (struct eth_priv_t )dev->priv;
	struct phy_device *phy_dev = eth_priv->phy_dev;

	debug("+ emac_close\n");

	if (!emac_open)
	return;

	ethss_stop();

	ksnav_close(&netcp_pktdma);
	qm_close();
	phy_shutdown(phy_dev);

	emac_open = 0;

	debug("- emac_close\n");
	}

	/*
	* This function sends a single packet on the network and returns
	* positive number (number of bytes transmitted) or negative for error
	*/
	static int keystone2_eth_send_packet(struct eth_device *dev,
	void *packet, int length)
	{
	int ret_status = -1;
	struct eth_priv_t eth_priv = (struct eth_priv_t )dev->priv;
	struct phy_device *phy_dev = eth_priv->phy_dev;

	genphy_update_link(phy_dev);
	if (phy_dev->link == 0)
	return -1;

	if (cpmac_drv_send((u32 *)packet, length, eth_priv->slave_port) != 0)
	return ret_status;

	return length;
	}

	/*
	* This function handles receipt of a packet from the network
	*/
	static int keystone2_eth_rcv_packet(struct eth_device *dev)
	{
	void *hd;
	int pkt_size;
	u32 *pkt;

	hd = ksnav_recv(&netcp_pktdma, &pkt, &pkt_size);
	if (hd == NULL)
	return 0;

	NetReceive((uchar *)pkt, pkt_size);

	ksnav_release_rxhd(&netcp_pktdma, hd);

	return pkt_size;
	}

	/*
	* This function initializes the EMAC hardware.
	*/
	int keystone2_emac_initialize(struct eth_priv_t *eth_priv)
	{
	int res;
	struct eth_device *dev;
	struct phy_device *phy_dev;

	dev = malloc(sizeof(struct eth_device));
	if (dev == NULL)
	return -1;

	memset(dev, 0, sizeof(struct eth_device));

	strcpy(dev->name, eth_priv->int_name);
	dev->priv = eth_priv;

	keystone2_eth_read_mac_addr(dev);

	dev->iobase = 0;
	dev->init = keystone2_eth_open;
	dev->halt = keystone2_eth_close;
	dev->send = keystone2_eth_send_packet;
	dev->recv = keystone2_eth_rcv_packet;

	eth_register(dev);

	/* Register MDIO bus if it's not registered yet */
	if (!mdio_bus) {
	mdio_bus = mdio_alloc();
	mdio_bus->read = keystone2_mdio_read;
	mdio_bus->write = keystone2_mdio_write;
	mdio_bus->reset = keystone2_mdio_reset;
	mdio_bus->priv = (void *)EMAC_MDIO_BASE_ADDR;
	sprintf(mdio_bus->name, "ethernet-mdio");

	res = mdio_register(mdio_bus);
	if (res)
	return res;
	}

	keystone2_net_serdes_setup();

	/* Create phy device and bind it with driver */
	#ifdef CONFIG_KSNET_MDIO_PHY_CONFIG_ENABLE
	phy_dev = phy_connect(mdio_bus, eth_priv->phy_addr,
	dev, PHY_INTERFACE_MODE_SGMII);
	phy_config(phy_dev);
	#else
	phy_dev = phy_find_by_mask(mdio_bus, 1 << eth_priv->phy_addr,
	PHY_INTERFACE_MODE_SGMII);
	phy_dev->dev = dev;
	#endif
	eth_priv->phy_dev = phy_dev;

	return 0;
	}

	struct ks2_serdes ks2_serdes_sgmii_156p25mhz = {
	.clk = SERDES_CLOCK_156P25M,
	.rate = SERDES_RATE_5G,
	.rate_mode = SERDES_QUARTER_RATE,
	.intf = SERDES_PHY_SGMII,
	.loopback = 0,
	};

	static void keystone2_net_serdes_setup(void)
	{
	ks2_serdes_init(CONFIG_KSNET_SERDES_SGMII_BASE,
	&ks2_serdes_sgmii_156p25mhz,
	CONFIG_KSNET_SERDES_LANES_PER_SGMII);

	#if defined(CONFIG_SOC_K2E) \|\| defined(CONFIG_SOC_K2L)
	ks2_serdes_init(CONFIG_KSNET_SERDES_SGMII2_BASE,
	&ks2_serdes_sgmii_156p25mhz,
	CONFIG_KSNET_SERDES_LANES_PER_SGMII);
	#endif

	/* wait till setup */
	udelay(5000);
	}