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

 /*
  * (C) Copyright 2011 Michal Simek
  *
  * Michal SIMEK <monstr@monstr.eu>
  *
  * Based on Xilinx gmac driver:
  * (C) Copyright 2011 Xilinx
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <dm.h>
 #include <net.h>
 #include <netdev.h>
 #include <config.h>
 #include <console.h>
 #include <malloc.h>
 #include <asm/io.h>
 #include <phy.h>
 #include <miiphy.h>
 #include <wait_bit.h>
 #include <watchdog.h>
 #include <asm/system.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/sys_proto.h>
 #include <asm-generic/errno.h>

 DECLARE_GLOBAL_DATA_PTR;

 /* Bit/mask specification */
 #define ZYNQ_GEM_PHYMNTNC_OP_MASK	0x40020000 /* operation mask bits */
 #define ZYNQ_GEM_PHYMNTNC_OP_R_MASK	0x20000000 /* read operation */
 #define ZYNQ_GEM_PHYMNTNC_OP_W_MASK	0x10000000 /* write operation */
 #define ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK	23 /* Shift bits for PHYAD */
 #define ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK	18 /* Shift bits for PHREG */

 #define ZYNQ_GEM_RXBUF_EOF_MASK		0x00008000 /* End of frame. */
 #define ZYNQ_GEM_RXBUF_SOF_MASK		0x00004000 /* Start of frame. */
 #define ZYNQ_GEM_RXBUF_LEN_MASK		0x00003FFF /* Mask for length field */

 #define ZYNQ_GEM_RXBUF_WRAP_MASK	0x00000002 /* Wrap bit, last BD */
 #define ZYNQ_GEM_RXBUF_NEW_MASK		0x00000001 /* Used bit.. */
 #define ZYNQ_GEM_RXBUF_ADD_MASK		0xFFFFFFFC /* Mask for address */

 /* Wrap bit, last descriptor */
 #define ZYNQ_GEM_TXBUF_WRAP_MASK	0x40000000
 #define ZYNQ_GEM_TXBUF_LAST_MASK	0x00008000 /* Last buffer */
 #define ZYNQ_GEM_TXBUF_USED_MASK	0x80000000 /* Used by Hw */

 #define ZYNQ_GEM_NWCTRL_TXEN_MASK	0x00000008 /* Enable transmit */
 #define ZYNQ_GEM_NWCTRL_RXEN_MASK	0x00000004 /* Enable receive */
 #define ZYNQ_GEM_NWCTRL_MDEN_MASK	0x00000010 /* Enable MDIO port */
 #define ZYNQ_GEM_NWCTRL_STARTTX_MASK	0x00000200 /* Start tx (tx_go) */

 #define ZYNQ_GEM_NWCFG_SPEED100		0x000000001 /* 100 Mbps operation */
 #define ZYNQ_GEM_NWCFG_SPEED1000	0x000000400 /* 1Gbps operation */
 #define ZYNQ_GEM_NWCFG_FDEN		0x000000002 /* Full Duplex mode */
 #define ZYNQ_GEM_NWCFG_FSREM		0x000020000 /* FCS removal */
 #define ZYNQ_GEM_NWCFG_SGMII_ENBL	0x080000000 /* SGMII Enable */
 #define ZYNQ_GEM_NWCFG_PCS_SEL		0x000000800 /* PCS select */
 #ifdef CONFIG_ARM64
 #define ZYNQ_GEM_NWCFG_MDCCLKDIV	0x000100000 /* Div pclk by 64, max 160MHz */
 #else
 #define ZYNQ_GEM_NWCFG_MDCCLKDIV	0x0000c0000 /* Div pclk by 48, max 120MHz */
 #endif

 #ifdef CONFIG_ARM64
 # define ZYNQ_GEM_DBUS_WIDTH	(1 << 21) /* 64 bit bus */
 #else
 # define ZYNQ_GEM_DBUS_WIDTH	(0 << 21) /* 32 bit bus */
 #endif

 #define ZYNQ_GEM_NWCFG_INIT		(ZYNQ_GEM_DBUS_WIDTH | \
 					ZYNQ_GEM_NWCFG_FDEN | \
 					ZYNQ_GEM_NWCFG_FSREM | \
 					ZYNQ_GEM_NWCFG_MDCCLKDIV)

 #define ZYNQ_GEM_NWSR_MDIOIDLE_MASK	0x00000004 /* PHY management idle */

 #define ZYNQ_GEM_DMACR_BLENGTH		0x00000004 /* INCR4 AHB bursts */
 /* Use full configured addressable space (8 Kb) */
 #define ZYNQ_GEM_DMACR_RXSIZE		0x00000300
 /* Use full configured addressable space (4 Kb) */
 #define ZYNQ_GEM_DMACR_TXSIZE		0x00000400
 /* Set with binary 00011000 to use 1536 byte(1*max length frame/buffer) */
 #define ZYNQ_GEM_DMACR_RXBUF		0x00180000

 #define ZYNQ_GEM_DMACR_INIT		(ZYNQ_GEM_DMACR_BLENGTH | \
 					ZYNQ_GEM_DMACR_RXSIZE | \
 					ZYNQ_GEM_DMACR_TXSIZE | \
 					ZYNQ_GEM_DMACR_RXBUF)

 #define ZYNQ_GEM_TSR_DONE		0x00000020 /* Tx done mask */

 #define ZYNQ_GEM_PCS_CTL_ANEG_ENBL	0x1000

 /* Use MII register 1 (MII status register) to detect PHY */
 #define PHY_DETECT_REG  1

 /* Mask used to verify certain PHY features (or register contents)
  * in the register above:
  *  0x1000: 10Mbps full duplex support
  *  0x0800: 10Mbps half duplex support
  *  0x0008: Auto-negotiation support
  */
 #define PHY_DETECT_MASK 0x1808

 /* TX BD status masks */
 #define ZYNQ_GEM_TXBUF_FRMLEN_MASK	0x000007ff
 #define ZYNQ_GEM_TXBUF_EXHAUSTED	0x08000000
 #define ZYNQ_GEM_TXBUF_UNDERRUN		0x10000000

 /* Clock frequencies for different speeds */
 #define ZYNQ_GEM_FREQUENCY_10	2500000UL
 #define ZYNQ_GEM_FREQUENCY_100	25000000UL
 #define ZYNQ_GEM_FREQUENCY_1000	125000000UL

 /* Device registers */
 struct zynq_gem_regs {
 	u32 nwctrl; /* 0x0 - Network Control reg */
 	u32 nwcfg; /* 0x4 - Network Config reg */
 	u32 nwsr; /* 0x8 - Network Status reg */
 	u32 reserved1;
 	u32 dmacr; /* 0x10 - DMA Control reg */
 	u32 txsr; /* 0x14 - TX Status reg */
 	u32 rxqbase; /* 0x18 - RX Q Base address reg */
 	u32 txqbase; /* 0x1c - TX Q Base address reg */
 	u32 rxsr; /* 0x20 - RX Status reg */
 	u32 reserved2[2];
 	u32 idr; /* 0x2c - Interrupt Disable reg */
 	u32 reserved3;
 	u32 phymntnc; /* 0x34 - Phy Maintaince reg */
 	u32 reserved4[18];
 	u32 hashl; /* 0x80 - Hash Low address reg */
 	u32 hashh; /* 0x84 - Hash High address reg */
 #define LADDR_LOW	0
 #define LADDR_HIGH	1
 	u32 laddr[4][LADDR_HIGH + 1]; /* 0x8c - Specific1 addr low/high reg */
 	u32 match[4]; /* 0xa8 - Type ID1 Match reg */
 	u32 reserved6[18];
 #define STAT_SIZE	44
 	u32 stat[STAT_SIZE]; /* 0x100 - Octects transmitted Low reg */
 	u32 reserved9[20];
 	u32 pcscntrl;
 	u32 reserved7[143];
 	u32 transmit_q1_ptr; /* 0x440 - Transmit priority queue 1 */
 	u32 reserved8[15];
 	u32 receive_q1_ptr; /* 0x480 - Receive priority queue 1 */
 };

 /* BD descriptors */
 struct emac_bd {
 	u32 addr; /* Next descriptor pointer */
 	u32 status;
 };

 #define RX_BUF 32
 /* Page table entries are set to 1MB, or multiples of 1MB
  * (not < 1MB). driver uses less bd's so use 1MB bdspace.
  */
 #define BD_SPACE	0x100000
 /* BD separation space */
 #define BD_SEPRN_SPACE	(RX_BUF * sizeof(struct emac_bd))

 /* Setup the first free TX descriptor */
 #define TX_FREE_DESC	2

 /* Initialized, rxbd_current, rx_first_buf must be 0 after init */
 struct zynq_gem_priv {
 	struct emac_bd *tx_bd;
 	struct emac_bd *rx_bd;
 	char *rxbuffers;
 	u32 rxbd_current;
 	u32 rx_first_buf;
 	int phyaddr;
 	u32 emio;
 	int init;
 	struct zynq_gem_regs *iobase;
 	phy_interface_t interface;
 	struct phy_device *phydev;
 	struct mii_dev *bus;
 };

 static inline int mdio_wait(struct zynq_gem_regs *regs)
 {
 	u32 timeout = 20000;

 	/* Wait till MDIO interface is ready to accept a new transaction. */
 	while (--timeout) {
 		if (readl(&regs->nwsr) & ZYNQ_GEM_NWSR_MDIOIDLE_MASK)
 			break;
 		WATCHDOG_RESET();
 	}

 	if (!timeout) {
 		printf("%s: Timeout\n", __func__);
 		return 1;
 	}

 	return 0;
 }

 static u32 phy_setup_op(struct zynq_gem_priv *priv, u32 phy_addr, u32 regnum,
 			u32 op, u16 *data)
 {
 	u32 mgtcr;
 	struct zynq_gem_regs *regs = priv->iobase;

 	if (mdio_wait(regs))
 		return 1;

 	/* Construct mgtcr mask for the operation */
 	mgtcr = ZYNQ_GEM_PHYMNTNC_OP_MASK | op |
 		(phy_addr << ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK) |
 		(regnum << ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK) | *data;

 	/* Write mgtcr and wait for completion */
 	writel(mgtcr, &regs->phymntnc);

 	if (mdio_wait(regs))
 		return 1;

 	if (op == ZYNQ_GEM_PHYMNTNC_OP_R_MASK)
 		*data = readl(&regs->phymntnc);

 	return 0;
 }

 static u32 phyread(struct zynq_gem_priv *priv, u32 phy_addr,
 		   u32 regnum, u16 *val)
 {
 	u32 ret;

 	ret = phy_setup_op(priv, phy_addr, regnum,
 			   ZYNQ_GEM_PHYMNTNC_OP_R_MASK, val);

 	if (!ret)
 		debug("%s: phy_addr %d, regnum 0x%x, val 0x%x\n", __func__,
 		      phy_addr, regnum, *val);

 	return ret;
 }

 static u32 phywrite(struct zynq_gem_priv *priv, u32 phy_addr,
 		    u32 regnum, u16 data)
 {
 	debug("%s: phy_addr %d, regnum 0x%x, data 0x%x\n", __func__, phy_addr,
 	      regnum, data);

 	return phy_setup_op(priv, phy_addr, regnum,
 			    ZYNQ_GEM_PHYMNTNC_OP_W_MASK, &data);
 }

 static int phy_detection(struct udevice *dev)
 {
 	int i;
 	u16 phyreg;
 	struct zynq_gem_priv *priv = dev->priv;

 	if (priv->phyaddr != -1) {
 		phyread(priv, priv->phyaddr, PHY_DETECT_REG, &phyreg);
 		if ((phyreg != 0xFFFF) &&
 		    ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
 			/* Found a valid PHY address */
 			debug("Default phy address %d is valid\n",
 			      priv->phyaddr);
 			return 0;
 		} else {
 			debug("PHY address is not setup correctly %d\n",
 			      priv->phyaddr);
 			priv->phyaddr = -1;
 		}
 	}

 	debug("detecting phy address\n");
 	if (priv->phyaddr == -1) {
 		/* detect the PHY address */
 		for (i = 31; i >= 0; i--) {
 			phyread(priv, i, PHY_DETECT_REG, &phyreg);
 			if ((phyreg != 0xFFFF) &&
 			    ((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
 				/* Found a valid PHY address */
 				priv->phyaddr = i;
 				debug("Found valid phy address, %d\n", i);
 				return 0;
 			}
 		}
 	}
 	printf("PHY is not detected\n");
 	return -1;
 }

 static int zynq_gem_setup_mac(struct udevice *dev)
 {
 	u32 i, macaddrlow, macaddrhigh;
 	struct eth_pdata *pdata = dev_get_platdata(dev);
 	struct zynq_gem_priv *priv = dev_get_priv(dev);
 	struct zynq_gem_regs *regs = priv->iobase;

 	/* Set the MAC bits [31:0] in BOT */
 	macaddrlow = pdata->enetaddr[0];
 	macaddrlow |= pdata->enetaddr[1] << 8;
 	macaddrlow |= pdata->enetaddr[2] << 16;
 	macaddrlow |= pdata->enetaddr[3] << 24;

 	/* Set MAC bits [47:32] in TOP */
 	macaddrhigh = pdata->enetaddr[4];
 	macaddrhigh |= pdata->enetaddr[5] << 8;

 	for (i = 0; i < 4; i++) {
 		writel(0, &regs->laddr[i][LADDR_LOW]);
 		writel(0, &regs->laddr[i][LADDR_HIGH]);
 		/* Do not use MATCHx register */
 		writel(0, &regs->match[i]);
 	}

 	writel(macaddrlow, &regs->laddr[0][LADDR_LOW]);
 	writel(macaddrhigh, &regs->laddr[0][LADDR_HIGH]);

 	return 0;
 }

 static int zynq_phy_init(struct udevice *dev)
 {
 	int ret;
 	struct zynq_gem_priv *priv = dev_get_priv(dev);
 	struct zynq_gem_regs *regs = priv->iobase;
 	const u32 supported = SUPPORTED_10baseT_Half |
 			SUPPORTED_10baseT_Full |
 			SUPPORTED_100baseT_Half |
 			SUPPORTED_100baseT_Full |
 			SUPPORTED_1000baseT_Half |
 			SUPPORTED_1000baseT_Full;

 	/* Enable only MDIO bus */
 	writel(ZYNQ_GEM_NWCTRL_MDEN_MASK, &regs->nwctrl);

 	if (priv->interface != PHY_INTERFACE_MODE_SGMII) {
 		ret = phy_detection(dev);
 		if (ret) {
 			printf("GEM PHY init failed\n");
 			return ret;
 		}
 	}

 	priv->phydev = phy_connect(priv->bus, priv->phyaddr, dev,
 				   priv->interface);
 	if (!priv->phydev)
 		return -ENODEV;

 	priv->phydev->supported = supported | ADVERTISED_Pause |
 				  ADVERTISED_Asym_Pause;
 	priv->phydev->advertising = priv->phydev->supported;
 	phy_config(priv->phydev);

 	return 0;
 }

 static int zynq_gem_init(struct udevice *dev)
 {
 	u32 i, nwconfig;
 	unsigned long clk_rate = 0;
 	struct zynq_gem_priv *priv = dev_get_priv(dev);
 	struct zynq_gem_regs *regs = priv->iobase;
 	struct emac_bd *dummy_tx_bd = &priv->tx_bd[TX_FREE_DESC];
 	struct emac_bd *dummy_rx_bd = &priv->tx_bd[TX_FREE_DESC + 2];

 	if (!priv->init) {
 		/* Disable all interrupts */
 		writel(0xFFFFFFFF, &regs->idr);

 		/* Disable the receiver & transmitter */
 		writel(0, &regs->nwctrl);
 		writel(0, &regs->txsr);
 		writel(0, &regs->rxsr);
 		writel(0, &regs->phymntnc);

 		/* Clear the Hash registers for the mac address
 		 * pointed by AddressPtr
 		 */
 		writel(0x0, &regs->hashl);
 		/* Write bits [63:32] in TOP */
 		writel(0x0, &regs->hashh);

 		/* Clear all counters */
 		for (i = 0; i < STAT_SIZE; i++)
 			readl(&regs->stat[i]);

 		/* Setup RxBD space */
 		memset(priv->rx_bd, 0, RX_BUF * sizeof(struct emac_bd));

 		for (i = 0; i < RX_BUF; i++) {
 			priv->rx_bd[i].status = 0xF0000000;
 			priv->rx_bd[i].addr =
 					((ulong)(priv->rxbuffers) +
 							(i * PKTSIZE_ALIGN));
 		}
 		/* WRAP bit to last BD */
 		priv->rx_bd[--i].addr |= ZYNQ_GEM_RXBUF_WRAP_MASK;
 		/* Write RxBDs to IP */
 		writel((ulong)priv->rx_bd, &regs->rxqbase);

 		/* Setup for DMA Configuration register */
 		writel(ZYNQ_GEM_DMACR_INIT, &regs->dmacr);

 		/* Setup for Network Control register, MDIO, Rx and Tx enable */
 		setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_MDEN_MASK);

 		/* Disable the second priority queue */
 		dummy_tx_bd->addr = 0;
 		dummy_tx_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK |
 				ZYNQ_GEM_TXBUF_LAST_MASK|
 				ZYNQ_GEM_TXBUF_USED_MASK;

 		dummy_rx_bd->addr = ZYNQ_GEM_RXBUF_WRAP_MASK |
 				ZYNQ_GEM_RXBUF_NEW_MASK;
 		dummy_rx_bd->status = 0;
 		flush_dcache_range((ulong)&dummy_tx_bd, (ulong)&dummy_tx_bd +
 				   sizeof(dummy_tx_bd));
 		flush_dcache_range((ulong)&dummy_rx_bd, (ulong)&dummy_rx_bd +
 				   sizeof(dummy_rx_bd));

 		writel((ulong)dummy_tx_bd, &regs->transmit_q1_ptr);
 		writel((ulong)dummy_rx_bd, &regs->receive_q1_ptr);

 		priv->init++;
 	}

 	phy_startup(priv->phydev);

 	if (!priv->phydev->link) {
 		printf("%s: No link.\n", priv->phydev->dev->name);
 		return -1;
 	}

 	nwconfig = ZYNQ_GEM_NWCFG_INIT;

 	if (priv->interface == PHY_INTERFACE_MODE_SGMII) {
 		nwconfig |= ZYNQ_GEM_NWCFG_SGMII_ENBL |
 			    ZYNQ_GEM_NWCFG_PCS_SEL;
 #ifdef CONFIG_ARM64
 		writel(readl(&regs->pcscntrl) | ZYNQ_GEM_PCS_CTL_ANEG_ENBL,
 		       &regs->pcscntrl);
 #endif
 	}

 	switch (priv->phydev->speed) {
 	case SPEED_1000:
 		writel(nwconfig | ZYNQ_GEM_NWCFG_SPEED1000,
 		       &regs->nwcfg);
 		clk_rate = ZYNQ_GEM_FREQUENCY_1000;
 		break;
 	case SPEED_100:
 		writel(nwconfig | ZYNQ_GEM_NWCFG_SPEED100,
 		       &regs->nwcfg);
 		clk_rate = ZYNQ_GEM_FREQUENCY_100;
 		break;
 	case SPEED_10:
 		clk_rate = ZYNQ_GEM_FREQUENCY_10;
 		break;
 	}

 	/* Change the rclk and clk only not using EMIO interface */
 	if (!priv->emio)
 		zynq_slcr_gem_clk_setup((ulong)priv->iobase !=
 					ZYNQ_GEM_BASEADDR0, clk_rate);

 	setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
 					ZYNQ_GEM_NWCTRL_TXEN_MASK);

 	return 0;
 }

 static int zynq_gem_send(struct udevice *dev, void *ptr, int len)
 {
 	u32 addr, size;
 	struct zynq_gem_priv *priv = dev_get_priv(dev);
 	struct zynq_gem_regs *regs = priv->iobase;
 	struct emac_bd *current_bd = &priv->tx_bd[1];

 	/* Setup Tx BD */
 	memset(priv->tx_bd, 0, sizeof(struct emac_bd));

 	priv->tx_bd->addr = (ulong)ptr;
 	priv->tx_bd->status = (len & ZYNQ_GEM_TXBUF_FRMLEN_MASK) |
 			       ZYNQ_GEM_TXBUF_LAST_MASK;
 	/* Dummy descriptor to mark it as the last in descriptor chain */
 	current_bd->addr = 0x0;
 	current_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK |
 			     ZYNQ_GEM_TXBUF_LAST_MASK|
 			     ZYNQ_GEM_TXBUF_USED_MASK;

 	/* setup BD */
 	writel((ulong)priv->tx_bd, &regs->txqbase);

 	addr = (ulong) ptr;
 	addr &= ~(ARCH_DMA_MINALIGN - 1);
 	size = roundup(len, ARCH_DMA_MINALIGN);
 	flush_dcache_range(addr, addr + size);

 	addr = (ulong)priv->rxbuffers;
 	addr &= ~(ARCH_DMA_MINALIGN - 1);
 	size = roundup((RX_BUF * PKTSIZE_ALIGN), ARCH_DMA_MINALIGN);
 	flush_dcache_range(addr, addr + size);
 	barrier();

 	/* Start transmit */
 	setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_STARTTX_MASK);

 	/* Read TX BD status */
 	if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_EXHAUSTED)
 		printf("TX buffers exhausted in mid frame\n");

 	return wait_for_bit(__func__, &regs->txsr, ZYNQ_GEM_TSR_DONE,
 			    true, 20000, true);
 }

 /* Do not check frame_recd flag in rx_status register 0x20 - just poll BD */
 static int zynq_gem_recv(struct udevice *dev, int flags, uchar **packetp)
 {
 	int frame_len;
 	u32 addr;
 	struct zynq_gem_priv *priv = dev_get_priv(dev);
 	struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];

 	if (!(current_bd->addr & ZYNQ_GEM_RXBUF_NEW_MASK))
 		return -1;

 	if (!(current_bd->status &
 			(ZYNQ_GEM_RXBUF_SOF_MASK | ZYNQ_GEM_RXBUF_EOF_MASK))) {
 		printf("GEM: SOF or EOF not set for last buffer received!\n");
 		return -1;
 	}

 	frame_len = current_bd->status & ZYNQ_GEM_RXBUF_LEN_MASK;
 	if (!frame_len) {
 		printf("%s: Zero size packet?\n", __func__);
 		return -1;
 	}

 	addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK;
 	addr &= ~(ARCH_DMA_MINALIGN - 1);
 	*packetp = (uchar *)(uintptr_t)addr;

 	return frame_len;
 }

 static int zynq_gem_free_pkt(struct udevice *dev, uchar *packet, int length)
 {
 	struct zynq_gem_priv *priv = dev_get_priv(dev);
 	struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];
 	struct emac_bd *first_bd;

 	if (current_bd->status & ZYNQ_GEM_RXBUF_SOF_MASK) {
 		priv->rx_first_buf = priv->rxbd_current;
 	} else {
 		current_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
 		current_bd->status = 0xF0000000; /* FIXME */
 	}

 	if (current_bd->status & ZYNQ_GEM_RXBUF_EOF_MASK) {
 		first_bd = &priv->rx_bd[priv->rx_first_buf];
 		first_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
 		first_bd->status = 0xF0000000;
 	}

 	if ((++priv->rxbd_current) >= RX_BUF)
 		priv->rxbd_current = 0;

 	return 0;
 }

 static void zynq_gem_halt(struct udevice *dev)
 {
 	struct zynq_gem_priv *priv = dev_get_priv(dev);
 	struct zynq_gem_regs *regs = priv->iobase;

 	clrsetbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
 						ZYNQ_GEM_NWCTRL_TXEN_MASK, 0);
 }

 __weak int zynq_board_read_rom_ethaddr(unsigned char *ethaddr)
 {
 	return -ENOSYS;
 }

 static int zynq_gem_read_rom_mac(struct udevice *dev)
 {
 	int retval;
 	struct eth_pdata *pdata = dev_get_platdata(dev);

 	retval = zynq_board_read_rom_ethaddr(pdata->enetaddr);
 	if (retval == -ENOSYS)
 		retval = 0;

 	return retval;
 }

 static int zynq_gem_miiphy_read(struct mii_dev *bus, int addr,
 				int devad, int reg)
 {
 	struct zynq_gem_priv *priv = bus->priv;
 	int ret;
 	u16 val;

 	ret = phyread(priv, addr, reg, &val);
 	debug("%s 0x%x, 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, val, ret);
 	return val;
 }

 static int zynq_gem_miiphy_write(struct mii_dev *bus, int addr, int devad,
 				 int reg, u16 value)
 {
 	struct zynq_gem_priv *priv = bus->priv;

 	debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, value);
 	return phywrite(priv, addr, reg, value);
 }

 static int zynq_gem_probe(struct udevice *dev)
 {
 	void *bd_space;
 	struct zynq_gem_priv *priv = dev_get_priv(dev);
 	int ret;

 	/* Align rxbuffers to ARCH_DMA_MINALIGN */
 	priv->rxbuffers = memalign(ARCH_DMA_MINALIGN, RX_BUF * PKTSIZE_ALIGN);
 	memset(priv->rxbuffers, 0, RX_BUF * PKTSIZE_ALIGN);

 	/* Align bd_space to MMU_SECTION_SHIFT */
 	bd_space = memalign(1 << MMU_SECTION_SHIFT, BD_SPACE);
 	mmu_set_region_dcache_behaviour((phys_addr_t)bd_space,
 					BD_SPACE, DCACHE_OFF);

 	/* Initialize the bd spaces for tx and rx bd's */
 	priv->tx_bd = (struct emac_bd *)bd_space;
 	priv->rx_bd = (struct emac_bd *)((ulong)bd_space + BD_SEPRN_SPACE);

 	priv->bus = mdio_alloc();
 	priv->bus->read = zynq_gem_miiphy_read;
 	priv->bus->write = zynq_gem_miiphy_write;
 	priv->bus->priv = priv;
 	strcpy(priv->bus->name, "gem");

 	ret = mdio_register(priv->bus);
 	if (ret)
 		return ret;

 	return zynq_phy_init(dev);
 }

 static int zynq_gem_remove(struct udevice *dev)
 {
 	struct zynq_gem_priv *priv = dev_get_priv(dev);

 	free(priv->phydev);
 	mdio_unregister(priv->bus);
 	mdio_free(priv->bus);

 	return 0;
 }

 static const struct eth_ops zynq_gem_ops = {
 	.start			= zynq_gem_init,
 	.send			= zynq_gem_send,
 	.recv			= zynq_gem_recv,
 	.free_pkt		= zynq_gem_free_pkt,
 	.stop			= zynq_gem_halt,
 	.write_hwaddr		= zynq_gem_setup_mac,
 	.read_rom_hwaddr	= zynq_gem_read_rom_mac,
 };

 static int zynq_gem_ofdata_to_platdata(struct udevice *dev)
 {
 	struct eth_pdata *pdata = dev_get_platdata(dev);
 	struct zynq_gem_priv *priv = dev_get_priv(dev);
 	int offset = 0;
 	const char *phy_mode;

 	pdata->iobase = (phys_addr_t)dev_get_addr(dev);
 	priv->iobase = (struct zynq_gem_regs *)pdata->iobase;
 	/* Hardcode for now */
 	priv->emio = 0;
 	priv->phyaddr = -1;

 	offset = fdtdec_lookup_phandle(gd->fdt_blob, dev->of_offset,
 				       "phy-handle");
 	if (offset > 0)
 		priv->phyaddr = fdtdec_get_int(gd->fdt_blob, offset, "reg", -1);

 	phy_mode = fdt_getprop(gd->fdt_blob, dev->of_offset, "phy-mode", NULL);
 	if (phy_mode)
 		pdata->phy_interface = phy_get_interface_by_name(phy_mode);
 	if (pdata->phy_interface == -1) {
 		debug("%s: Invalid PHY interface '%s'\n", __func__, phy_mode);
 		return -EINVAL;
 	}
 	priv->interface = pdata->phy_interface;

 	priv->emio = fdtdec_get_bool(gd->fdt_blob, dev->of_offset, "xlnx,emio");

 	printf("ZYNQ GEM: %lx, phyaddr %d, interface %s\n", (ulong)priv->iobase,
 	       priv->phyaddr, phy_string_for_interface(priv->interface));

 	return 0;
 }

 static const struct udevice_id zynq_gem_ids[] = {
 	{ .compatible = "cdns,zynqmp-gem" },
 	{ .compatible = "cdns,zynq-gem" },
 	{ .compatible = "cdns,gem" },
 	{ }
 };

 U_BOOT_DRIVER(zynq_gem) = {
 	.name	= "zynq_gem",
 	.id	= UCLASS_ETH,
 	.of_match = zynq_gem_ids,
 	.ofdata_to_platdata = zynq_gem_ofdata_to_platdata,
 	.probe	= zynq_gem_probe,
 	.remove	= zynq_gem_remove,
 	.ops	= &zynq_gem_ops,
 	.priv_auto_alloc_size = sizeof(struct zynq_gem_priv),
 	.platdata_auto_alloc_size = sizeof(struct eth_pdata),
 };
	/*
	* (C) Copyright 2011 Michal Simek
	*
	* Michal SIMEK <monstr@monstr.eu>
	*
	* Based on Xilinx gmac driver:
	* (C) Copyright 2011 Xilinx
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <dm.h>
	#include <net.h>
	#include <netdev.h>
	#include <config.h>
	#include <console.h>
	#include <malloc.h>
	#include <asm/io.h>
	#include <phy.h>
	#include <miiphy.h>
	#include <wait_bit.h>
	#include <watchdog.h>
	#include <asm/system.h>
	#include <asm/arch/hardware.h>
	#include <asm/arch/sys_proto.h>
	#include <asm-generic/errno.h>

	DECLARE_GLOBAL_DATA_PTR;

	/* Bit/mask specification */
	#define ZYNQ_GEM_PHYMNTNC_OP_MASK 0x40020000 /* operation mask bits */
	#define ZYNQ_GEM_PHYMNTNC_OP_R_MASK 0x20000000 /* read operation */
	#define ZYNQ_GEM_PHYMNTNC_OP_W_MASK 0x10000000 /* write operation */
	#define ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK 23 /* Shift bits for PHYAD */
	#define ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK 18 /* Shift bits for PHREG */

	#define ZYNQ_GEM_RXBUF_EOF_MASK 0x00008000 /* End of frame. */
	#define ZYNQ_GEM_RXBUF_SOF_MASK 0x00004000 /* Start of frame. */
	#define ZYNQ_GEM_RXBUF_LEN_MASK 0x00003FFF /* Mask for length field */

	#define ZYNQ_GEM_RXBUF_WRAP_MASK 0x00000002 /* Wrap bit, last BD */
	#define ZYNQ_GEM_RXBUF_NEW_MASK 0x00000001 /* Used bit.. */
	#define ZYNQ_GEM_RXBUF_ADD_MASK 0xFFFFFFFC /* Mask for address */

	/* Wrap bit, last descriptor */
	#define ZYNQ_GEM_TXBUF_WRAP_MASK 0x40000000
	#define ZYNQ_GEM_TXBUF_LAST_MASK 0x00008000 /* Last buffer */
	#define ZYNQ_GEM_TXBUF_USED_MASK 0x80000000 /* Used by Hw */

	#define ZYNQ_GEM_NWCTRL_TXEN_MASK 0x00000008 /* Enable transmit */
	#define ZYNQ_GEM_NWCTRL_RXEN_MASK 0x00000004 /* Enable receive */
	#define ZYNQ_GEM_NWCTRL_MDEN_MASK 0x00000010 /* Enable MDIO port */
	#define ZYNQ_GEM_NWCTRL_STARTTX_MASK 0x00000200 /* Start tx (tx_go) */

	#define ZYNQ_GEM_NWCFG_SPEED100 0x000000001 /* 100 Mbps operation */
	#define ZYNQ_GEM_NWCFG_SPEED1000 0x000000400 /* 1Gbps operation */
	#define ZYNQ_GEM_NWCFG_FDEN 0x000000002 /* Full Duplex mode */
	#define ZYNQ_GEM_NWCFG_FSREM 0x000020000 /* FCS removal */
	#define ZYNQ_GEM_NWCFG_SGMII_ENBL 0x080000000 /* SGMII Enable */
	#define ZYNQ_GEM_NWCFG_PCS_SEL 0x000000800 /* PCS select */
	#ifdef CONFIG_ARM64
	#define ZYNQ_GEM_NWCFG_MDCCLKDIV 0x000100000 /* Div pclk by 64, max 160MHz */
	#else
	#define ZYNQ_GEM_NWCFG_MDCCLKDIV 0x0000c0000 /* Div pclk by 48, max 120MHz */
	#endif

	#ifdef CONFIG_ARM64
	# define ZYNQ_GEM_DBUS_WIDTH (1 << 21) /* 64 bit bus */
	#else
	# define ZYNQ_GEM_DBUS_WIDTH (0 << 21) /* 32 bit bus */
	#endif

	#define ZYNQ_GEM_NWCFG_INIT (ZYNQ_GEM_DBUS_WIDTH \| \
	ZYNQ_GEM_NWCFG_FDEN \| \
	ZYNQ_GEM_NWCFG_FSREM \| \
	ZYNQ_GEM_NWCFG_MDCCLKDIV)

	#define ZYNQ_GEM_NWSR_MDIOIDLE_MASK 0x00000004 /* PHY management idle */

	#define ZYNQ_GEM_DMACR_BLENGTH 0x00000004 /* INCR4 AHB bursts */
	/* Use full configured addressable space (8 Kb) */
	#define ZYNQ_GEM_DMACR_RXSIZE 0x00000300
	/* Use full configured addressable space (4 Kb) */
	#define ZYNQ_GEM_DMACR_TXSIZE 0x00000400
	/* Set with binary 00011000 to use 1536 byte(1max length frame/buffer) /
	#define ZYNQ_GEM_DMACR_RXBUF 0x00180000

	#define ZYNQ_GEM_DMACR_INIT (ZYNQ_GEM_DMACR_BLENGTH \| \
	ZYNQ_GEM_DMACR_RXSIZE \| \
	ZYNQ_GEM_DMACR_TXSIZE \| \
	ZYNQ_GEM_DMACR_RXBUF)

	#define ZYNQ_GEM_TSR_DONE 0x00000020 /* Tx done mask */

	#define ZYNQ_GEM_PCS_CTL_ANEG_ENBL 0x1000

	/* Use MII register 1 (MII status register) to detect PHY */
	#define PHY_DETECT_REG 1

	/* Mask used to verify certain PHY features (or register contents)
	* in the register above:
	* 0x1000: 10Mbps full duplex support
	* 0x0800: 10Mbps half duplex support
	* 0x0008: Auto-negotiation support
	*/
	#define PHY_DETECT_MASK 0x1808

	/* TX BD status masks */
	#define ZYNQ_GEM_TXBUF_FRMLEN_MASK 0x000007ff
	#define ZYNQ_GEM_TXBUF_EXHAUSTED 0x08000000
	#define ZYNQ_GEM_TXBUF_UNDERRUN 0x10000000

	/* Clock frequencies for different speeds */
	#define ZYNQ_GEM_FREQUENCY_10 2500000UL
	#define ZYNQ_GEM_FREQUENCY_100 25000000UL
	#define ZYNQ_GEM_FREQUENCY_1000 125000000UL

	/* Device registers */
	struct zynq_gem_regs {
	u32 nwctrl; /* 0x0 - Network Control reg */
	u32 nwcfg; /* 0x4 - Network Config reg */
	u32 nwsr; /* 0x8 - Network Status reg */
	u32 reserved1;
	u32 dmacr; /* 0x10 - DMA Control reg */
	u32 txsr; /* 0x14 - TX Status reg */
	u32 rxqbase; /* 0x18 - RX Q Base address reg */
	u32 txqbase; /* 0x1c - TX Q Base address reg */
	u32 rxsr; /* 0x20 - RX Status reg */
	u32 reserved2[2];
	u32 idr; /* 0x2c - Interrupt Disable reg */
	u32 reserved3;
	u32 phymntnc; /* 0x34 - Phy Maintaince reg */
	u32 reserved4[18];
	u32 hashl; /* 0x80 - Hash Low address reg */
	u32 hashh; /* 0x84 - Hash High address reg */
	#define LADDR_LOW 0
	#define LADDR_HIGH 1
	u32 laddr[4][LADDR_HIGH + 1]; /* 0x8c - Specific1 addr low/high reg */
	u32 match[4]; /* 0xa8 - Type ID1 Match reg */
	u32 reserved6[18];
	#define STAT_SIZE 44
	u32 stat[STAT_SIZE]; /* 0x100 - Octects transmitted Low reg */
	u32 reserved9[20];
	u32 pcscntrl;
	u32 reserved7[143];
	u32 transmit_q1_ptr; /* 0x440 - Transmit priority queue 1 */
	u32 reserved8[15];
	u32 receive_q1_ptr; /* 0x480 - Receive priority queue 1 */
	};

	/* BD descriptors */
	struct emac_bd {
	u32 addr; /* Next descriptor pointer */
	u32 status;
	};

	#define RX_BUF 32
	/* Page table entries are set to 1MB, or multiples of 1MB
	* (not < 1MB). driver uses less bd's so use 1MB bdspace.
	*/
	#define BD_SPACE 0x100000
	/* BD separation space */
	#define BD_SEPRN_SPACE (RX_BUF * sizeof(struct emac_bd))

	/* Setup the first free TX descriptor */
	#define TX_FREE_DESC 2

	/* Initialized, rxbd_current, rx_first_buf must be 0 after init */
	struct zynq_gem_priv {
	struct emac_bd *tx_bd;
	struct emac_bd *rx_bd;
	char *rxbuffers;
	u32 rxbd_current;
	u32 rx_first_buf;
	int phyaddr;
	u32 emio;
	int init;
	struct zynq_gem_regs *iobase;
	phy_interface_t interface;
	struct phy_device *phydev;
	struct mii_dev *bus;
	};

	static inline int mdio_wait(struct zynq_gem_regs *regs)
	{
	u32 timeout = 20000;

	/* Wait till MDIO interface is ready to accept a new transaction. */
	while (--timeout) {
	if (readl(&regs->nwsr) & ZYNQ_GEM_NWSR_MDIOIDLE_MASK)
	break;
	WATCHDOG_RESET();
	}

	if (!timeout) {
	printf("%s: Timeout\n", __func__);
	return 1;
	}

	return 0;
	}

	static u32 phy_setup_op(struct zynq_gem_priv *priv, u32 phy_addr, u32 regnum,
	u32 op, u16 *data)
	{
	u32 mgtcr;
	struct zynq_gem_regs *regs = priv->iobase;

	if (mdio_wait(regs))
	return 1;

	/* Construct mgtcr mask for the operation */
	mgtcr = ZYNQ_GEM_PHYMNTNC_OP_MASK \| op \|
	(phy_addr << ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK) \|
	(regnum << ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK) \| *data;

	/* Write mgtcr and wait for completion */
	writel(mgtcr, &regs->phymntnc);

	if (mdio_wait(regs))
	return 1;

	if (op == ZYNQ_GEM_PHYMNTNC_OP_R_MASK)
	*data = readl(&regs->phymntnc);

	return 0;
	}

	static u32 phyread(struct zynq_gem_priv *priv, u32 phy_addr,
	u32 regnum, u16 *val)
	{
	u32 ret;

	ret = phy_setup_op(priv, phy_addr, regnum,
	ZYNQ_GEM_PHYMNTNC_OP_R_MASK, val);

	if (!ret)
	debug("%s: phy_addr %d, regnum 0x%x, val 0x%x\n", __func__,
	phy_addr, regnum, *val);

	return ret;
	}

	static u32 phywrite(struct zynq_gem_priv *priv, u32 phy_addr,
	u32 regnum, u16 data)
	{
	debug("%s: phy_addr %d, regnum 0x%x, data 0x%x\n", __func__, phy_addr,
	regnum, data);

	return phy_setup_op(priv, phy_addr, regnum,
	ZYNQ_GEM_PHYMNTNC_OP_W_MASK, &data);
	}

	static int phy_detection(struct udevice *dev)
	{
	int i;
	u16 phyreg;
	struct zynq_gem_priv *priv = dev->priv;

	if (priv->phyaddr != -1) {
	phyread(priv, priv->phyaddr, PHY_DETECT_REG, &phyreg);
	if ((phyreg != 0xFFFF) &&
	((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
	/* Found a valid PHY address */
	debug("Default phy address %d is valid\n",
	priv->phyaddr);
	return 0;
	} else {
	debug("PHY address is not setup correctly %d\n",
	priv->phyaddr);
	priv->phyaddr = -1;
	}
	}

	debug("detecting phy address\n");
	if (priv->phyaddr == -1) {
	/* detect the PHY address */
	for (i = 31; i >= 0; i--) {
	phyread(priv, i, PHY_DETECT_REG, &phyreg);
	if ((phyreg != 0xFFFF) &&
	((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
	/* Found a valid PHY address */
	priv->phyaddr = i;
	debug("Found valid phy address, %d\n", i);
	return 0;
	}
	}
	}
	printf("PHY is not detected\n");
	return -1;
	}

	static int zynq_gem_setup_mac(struct udevice *dev)
	{
	u32 i, macaddrlow, macaddrhigh;
	struct eth_pdata *pdata = dev_get_platdata(dev);
	struct zynq_gem_priv *priv = dev_get_priv(dev);
	struct zynq_gem_regs *regs = priv->iobase;

	/* Set the MAC bits [31:0] in BOT */
	macaddrlow = pdata->enetaddr[0];
	macaddrlow \|= pdata->enetaddr[1] << 8;
	macaddrlow \|= pdata->enetaddr[2] << 16;
	macaddrlow \|= pdata->enetaddr[3] << 24;

	/* Set MAC bits [47:32] in TOP */
	macaddrhigh = pdata->enetaddr[4];
	macaddrhigh \|= pdata->enetaddr[5] << 8;

	for (i = 0; i < 4; i++) {
	writel(0, &regs->laddr[i][LADDR_LOW]);
	writel(0, &regs->laddr[i][LADDR_HIGH]);
	/* Do not use MATCHx register */
	writel(0, &regs->match[i]);
	}

	writel(macaddrlow, &regs->laddr[0][LADDR_LOW]);
	writel(macaddrhigh, &regs->laddr[0][LADDR_HIGH]);

	return 0;
	}

	static int zynq_phy_init(struct udevice *dev)
	{
	int ret;
	struct zynq_gem_priv *priv = dev_get_priv(dev);
	struct zynq_gem_regs *regs = priv->iobase;
	const u32 supported = SUPPORTED_10baseT_Half \|
	SUPPORTED_10baseT_Full \|
	SUPPORTED_100baseT_Half \|
	SUPPORTED_100baseT_Full \|
	SUPPORTED_1000baseT_Half \|
	SUPPORTED_1000baseT_Full;

	/* Enable only MDIO bus */
	writel(ZYNQ_GEM_NWCTRL_MDEN_MASK, &regs->nwctrl);

	if (priv->interface != PHY_INTERFACE_MODE_SGMII) {
	ret = phy_detection(dev);
	if (ret) {
	printf("GEM PHY init failed\n");
	return ret;
	}
	}

	priv->phydev = phy_connect(priv->bus, priv->phyaddr, dev,
	priv->interface);
	if (!priv->phydev)
	return -ENODEV;

	priv->phydev->supported = supported \| ADVERTISED_Pause \|
	ADVERTISED_Asym_Pause;
	priv->phydev->advertising = priv->phydev->supported;
	phy_config(priv->phydev);

	return 0;
	}

	static int zynq_gem_init(struct udevice *dev)
	{
	u32 i, nwconfig;
	unsigned long clk_rate = 0;
	struct zynq_gem_priv *priv = dev_get_priv(dev);
	struct zynq_gem_regs *regs = priv->iobase;
	struct emac_bd *dummy_tx_bd = &priv->tx_bd[TX_FREE_DESC];
	struct emac_bd *dummy_rx_bd = &priv->tx_bd[TX_FREE_DESC + 2];

	if (!priv->init) {
	/* Disable all interrupts */
	writel(0xFFFFFFFF, &regs->idr);

	/* Disable the receiver & transmitter */
	writel(0, &regs->nwctrl);
	writel(0, &regs->txsr);
	writel(0, &regs->rxsr);
	writel(0, &regs->phymntnc);

	/* Clear the Hash registers for the mac address
	* pointed by AddressPtr
	*/
	writel(0x0, &regs->hashl);
	/* Write bits [63:32] in TOP */
	writel(0x0, &regs->hashh);

	/* Clear all counters */
	for (i = 0; i < STAT_SIZE; i++)
	readl(&regs->stat[i]);

	/* Setup RxBD space */
	memset(priv->rx_bd, 0, RX_BUF * sizeof(struct emac_bd));

	for (i = 0; i < RX_BUF; i++) {
	priv->rx_bd[i].status = 0xF0000000;
	priv->rx_bd[i].addr =
	((ulong)(priv->rxbuffers) +
	(i * PKTSIZE_ALIGN));
	}
	/* WRAP bit to last BD */
	priv->rx_bd[--i].addr \|= ZYNQ_GEM_RXBUF_WRAP_MASK;
	/* Write RxBDs to IP */
	writel((ulong)priv->rx_bd, &regs->rxqbase);

	/* Setup for DMA Configuration register */
	writel(ZYNQ_GEM_DMACR_INIT, &regs->dmacr);

	/* Setup for Network Control register, MDIO, Rx and Tx enable */
	setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_MDEN_MASK);

	/* Disable the second priority queue */
	dummy_tx_bd->addr = 0;
	dummy_tx_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK \|
	ZYNQ_GEM_TXBUF_LAST_MASK\|
	ZYNQ_GEM_TXBUF_USED_MASK;

	dummy_rx_bd->addr = ZYNQ_GEM_RXBUF_WRAP_MASK \|
	ZYNQ_GEM_RXBUF_NEW_MASK;
	dummy_rx_bd->status = 0;
	flush_dcache_range((ulong)&dummy_tx_bd, (ulong)&dummy_tx_bd +
	sizeof(dummy_tx_bd));
	flush_dcache_range((ulong)&dummy_rx_bd, (ulong)&dummy_rx_bd +
	sizeof(dummy_rx_bd));

	writel((ulong)dummy_tx_bd, &regs->transmit_q1_ptr);
	writel((ulong)dummy_rx_bd, &regs->receive_q1_ptr);

	priv->init++;
	}

	phy_startup(priv->phydev);

	if (!priv->phydev->link) {
	printf("%s: No link.\n", priv->phydev->dev->name);
	return -1;
	}

	nwconfig = ZYNQ_GEM_NWCFG_INIT;

	if (priv->interface == PHY_INTERFACE_MODE_SGMII) {
	nwconfig \|= ZYNQ_GEM_NWCFG_SGMII_ENBL \|
	ZYNQ_GEM_NWCFG_PCS_SEL;
	#ifdef CONFIG_ARM64
	writel(readl(&regs->pcscntrl) \| ZYNQ_GEM_PCS_CTL_ANEG_ENBL,
	&regs->pcscntrl);
	#endif
	}

	switch (priv->phydev->speed) {
	case SPEED_1000:
	writel(nwconfig \| ZYNQ_GEM_NWCFG_SPEED1000,
	&regs->nwcfg);
	clk_rate = ZYNQ_GEM_FREQUENCY_1000;
	break;
	case SPEED_100:
	writel(nwconfig \| ZYNQ_GEM_NWCFG_SPEED100,
	&regs->nwcfg);
	clk_rate = ZYNQ_GEM_FREQUENCY_100;
	break;
	case SPEED_10:
	clk_rate = ZYNQ_GEM_FREQUENCY_10;
	break;
	}

	/* Change the rclk and clk only not using EMIO interface */
	if (!priv->emio)
	zynq_slcr_gem_clk_setup((ulong)priv->iobase !=
	ZYNQ_GEM_BASEADDR0, clk_rate);

	setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK \|
	ZYNQ_GEM_NWCTRL_TXEN_MASK);

	return 0;
	}

	static int zynq_gem_send(struct udevice dev, void ptr, int len)
	{
	u32 addr, size;
	struct zynq_gem_priv *priv = dev_get_priv(dev);
	struct zynq_gem_regs *regs = priv->iobase;
	struct emac_bd *current_bd = &priv->tx_bd[1];

	/* Setup Tx BD */
	memset(priv->tx_bd, 0, sizeof(struct emac_bd));

	priv->tx_bd->addr = (ulong)ptr;
	priv->tx_bd->status = (len & ZYNQ_GEM_TXBUF_FRMLEN_MASK) \|
	ZYNQ_GEM_TXBUF_LAST_MASK;
	/* Dummy descriptor to mark it as the last in descriptor chain */
	current_bd->addr = 0x0;
	current_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK \|
	ZYNQ_GEM_TXBUF_LAST_MASK\|
	ZYNQ_GEM_TXBUF_USED_MASK;

	/* setup BD */
	writel((ulong)priv->tx_bd, &regs->txqbase);

	addr = (ulong) ptr;
	addr &= ~(ARCH_DMA_MINALIGN - 1);
	size = roundup(len, ARCH_DMA_MINALIGN);
	flush_dcache_range(addr, addr + size);

	addr = (ulong)priv->rxbuffers;
	addr &= ~(ARCH_DMA_MINALIGN - 1);
	size = roundup((RX_BUF * PKTSIZE_ALIGN), ARCH_DMA_MINALIGN);
	flush_dcache_range(addr, addr + size);
	barrier();

	/* Start transmit */
	setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_STARTTX_MASK);

	/* Read TX BD status */
	if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_EXHAUSTED)
	printf("TX buffers exhausted in mid frame\n");

	return wait_for_bit(__func__, &regs->txsr, ZYNQ_GEM_TSR_DONE,
	true, 20000, true);
	}

	/* Do not check frame_recd flag in rx_status register 0x20 - just poll BD */
	static int zynq_gem_recv(struct udevice dev, int flags, uchar *packetp)
	{
	int frame_len;
	u32 addr;
	struct zynq_gem_priv *priv = dev_get_priv(dev);
	struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];

	if (!(current_bd->addr & ZYNQ_GEM_RXBUF_NEW_MASK))
	return -1;

	if (!(current_bd->status &
	(ZYNQ_GEM_RXBUF_SOF_MASK \| ZYNQ_GEM_RXBUF_EOF_MASK))) {
	printf("GEM: SOF or EOF not set for last buffer received!\n");
	return -1;
	}

	frame_len = current_bd->status & ZYNQ_GEM_RXBUF_LEN_MASK;
	if (!frame_len) {
	printf("%s: Zero size packet?\n", __func__);
	return -1;
	}

	addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK;
	addr &= ~(ARCH_DMA_MINALIGN - 1);
	packetp = (uchar )(uintptr_t)addr;

	return frame_len;
	}

	static int zynq_gem_free_pkt(struct udevice dev, uchar packet, int length)
	{
	struct zynq_gem_priv *priv = dev_get_priv(dev);
	struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];
	struct emac_bd *first_bd;

	if (current_bd->status & ZYNQ_GEM_RXBUF_SOF_MASK) {
	priv->rx_first_buf = priv->rxbd_current;
	} else {
	current_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
	current_bd->status = 0xF0000000; /* FIXME */
	}

	if (current_bd->status & ZYNQ_GEM_RXBUF_EOF_MASK) {
	first_bd = &priv->rx_bd[priv->rx_first_buf];
	first_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
	first_bd->status = 0xF0000000;
	}

	if ((++priv->rxbd_current) >= RX_BUF)
	priv->rxbd_current = 0;

	return 0;
	}

	static void zynq_gem_halt(struct udevice *dev)
	{
	struct zynq_gem_priv *priv = dev_get_priv(dev);
	struct zynq_gem_regs *regs = priv->iobase;

	clrsetbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK \|
	ZYNQ_GEM_NWCTRL_TXEN_MASK, 0);
	}

	__weak int zynq_board_read_rom_ethaddr(unsigned char *ethaddr)
	{
	return -ENOSYS;
	}

	static int zynq_gem_read_rom_mac(struct udevice *dev)
	{
	int retval;
	struct eth_pdata *pdata = dev_get_platdata(dev);

	retval = zynq_board_read_rom_ethaddr(pdata->enetaddr);
	if (retval == -ENOSYS)
	retval = 0;

	return retval;
	}

	static int zynq_gem_miiphy_read(struct mii_dev *bus, int addr,
	int devad, int reg)
	{
	struct zynq_gem_priv *priv = bus->priv;
	int ret;
	u16 val;

	ret = phyread(priv, addr, reg, &val);
	debug("%s 0x%x, 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, val, ret);
	return val;
	}

	static int zynq_gem_miiphy_write(struct mii_dev *bus, int addr, int devad,
	int reg, u16 value)
	{
	struct zynq_gem_priv *priv = bus->priv;

	debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, value);
	return phywrite(priv, addr, reg, value);
	}

	static int zynq_gem_probe(struct udevice *dev)
	{
	void *bd_space;
	struct zynq_gem_priv *priv = dev_get_priv(dev);
	int ret;

	/* Align rxbuffers to ARCH_DMA_MINALIGN */
	priv->rxbuffers = memalign(ARCH_DMA_MINALIGN, RX_BUF * PKTSIZE_ALIGN);
	memset(priv->rxbuffers, 0, RX_BUF * PKTSIZE_ALIGN);

	/* Align bd_space to MMU_SECTION_SHIFT */
	bd_space = memalign(1 << MMU_SECTION_SHIFT, BD_SPACE);
	mmu_set_region_dcache_behaviour((phys_addr_t)bd_space,
	BD_SPACE, DCACHE_OFF);

	/* Initialize the bd spaces for tx and rx bd's */
	priv->tx_bd = (struct emac_bd *)bd_space;
	priv->rx_bd = (struct emac_bd *)((ulong)bd_space + BD_SEPRN_SPACE);

	priv->bus = mdio_alloc();
	priv->bus->read = zynq_gem_miiphy_read;
	priv->bus->write = zynq_gem_miiphy_write;
	priv->bus->priv = priv;
	strcpy(priv->bus->name, "gem");

	ret = mdio_register(priv->bus);
	if (ret)
	return ret;

	return zynq_phy_init(dev);
	}

	static int zynq_gem_remove(struct udevice *dev)
	{
	struct zynq_gem_priv *priv = dev_get_priv(dev);

	free(priv->phydev);
	mdio_unregister(priv->bus);
	mdio_free(priv->bus);

	return 0;
	}

	static const struct eth_ops zynq_gem_ops = {
	.start = zynq_gem_init,
	.send = zynq_gem_send,
	.recv = zynq_gem_recv,
	.free_pkt = zynq_gem_free_pkt,
	.stop = zynq_gem_halt,
	.write_hwaddr = zynq_gem_setup_mac,
	.read_rom_hwaddr = zynq_gem_read_rom_mac,
	};

	static int zynq_gem_ofdata_to_platdata(struct udevice *dev)
	{
	struct eth_pdata *pdata = dev_get_platdata(dev);
	struct zynq_gem_priv *priv = dev_get_priv(dev);
	int offset = 0;
	const char *phy_mode;

	pdata->iobase = (phys_addr_t)dev_get_addr(dev);
	priv->iobase = (struct zynq_gem_regs *)pdata->iobase;
	/* Hardcode for now */
	priv->emio = 0;
	priv->phyaddr = -1;

	offset = fdtdec_lookup_phandle(gd->fdt_blob, dev->of_offset,
	"phy-handle");
	if (offset > 0)
	priv->phyaddr = fdtdec_get_int(gd->fdt_blob, offset, "reg", -1);

	phy_mode = fdt_getprop(gd->fdt_blob, dev->of_offset, "phy-mode", NULL);
	if (phy_mode)
	pdata->phy_interface = phy_get_interface_by_name(phy_mode);
	if (pdata->phy_interface == -1) {
	debug("%s: Invalid PHY interface '%s'\n", __func__, phy_mode);
	return -EINVAL;
	}
	priv->interface = pdata->phy_interface;

	priv->emio = fdtdec_get_bool(gd->fdt_blob, dev->of_offset, "xlnx,emio");

	printf("ZYNQ GEM: %lx, phyaddr %d, interface %s\n", (ulong)priv->iobase,
	priv->phyaddr, phy_string_for_interface(priv->interface));

	return 0;
	}

	static const struct udevice_id zynq_gem_ids[] = {
	{ .compatible = "cdns,zynqmp-gem" },
	{ .compatible = "cdns,zynq-gem" },
	{ .compatible = "cdns,gem" },
	{ }
	};

	U_BOOT_DRIVER(zynq_gem) = {
	.name = "zynq_gem",
	.id = UCLASS_ETH,
	.of_match = zynq_gem_ids,
	.ofdata_to_platdata = zynq_gem_ofdata_to_platdata,
	.probe = zynq_gem_probe,
	.remove = zynq_gem_remove,
	.ops = &zynq_gem_ops,
	.priv_auto_alloc_size = sizeof(struct zynq_gem_priv),
	.platdata_auto_alloc_size = sizeof(struct eth_pdata),
	};