drivers/net/at91_emac.c - platform/external/u-boot - Gitiles

 /*
  * Copyright (C) 2009 BuS Elektronik GmbH & Co. KG
  * Jens Scharsig (esw@bus-elektronik.de)
  *
  * (C) Copyright 2003
  * Author : Hamid Ikdoumi (Atmel)

  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/at91_emac.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/at91_pio.h>
 #include <net.h>
 #include <netdev.h>
 #include <malloc.h>
 #include <miiphy.h>
 #include <linux/mii.h>

 #undef MII_DEBUG
 #undef ET_DEBUG

 #if (CONFIG_SYS_RX_ETH_BUFFER > 1024)
 #error AT91 EMAC supports max 1024 RX buffers. \
 	Please decrease the CONFIG_SYS_RX_ETH_BUFFER value
 #endif

 #ifndef CONFIG_DRIVER_AT91EMAC_PHYADDR
 #define CONFIG_DRIVER_AT91EMAC_PHYADDR	0
 #endif

 /* MDIO clock must not exceed 2.5 MHz, so enable MCK divider */
 #if (AT91C_MASTER_CLOCK > 80000000)
 	#define HCLK_DIV	AT91_EMAC_CFG_MCLK_64
 #elif (AT91C_MASTER_CLOCK > 40000000)
 	#define HCLK_DIV	AT91_EMAC_CFG_MCLK_32
 #elif (AT91C_MASTER_CLOCK > 20000000)
 	#define HCLK_DIV	AT91_EMAC_CFG_MCLK_16
 #else
 	#define HCLK_DIV	AT91_EMAC_CFG_MCLK_8
 #endif

 #ifdef ET_DEBUG
 #define DEBUG_AT91EMAC	1
 #else
 #define DEBUG_AT91EMAC	0
 #endif

 #ifdef MII_DEBUG
 #define DEBUG_AT91PHY	1
 #else
 #define DEBUG_AT91PHY	0
 #endif

 #ifndef CONFIG_DRIVER_AT91EMAC_QUIET
 #define VERBOSEP	1
 #else
 #define VERBOSEP	0
 #endif

 #define RBF_ADDR      0xfffffffc
 #define RBF_OWNER     (1<<0)
 #define RBF_WRAP      (1<<1)
 #define RBF_BROADCAST (1<<31)
 #define RBF_MULTICAST (1<<30)
 #define RBF_UNICAST   (1<<29)
 #define RBF_EXTERNAL  (1<<28)
 #define RBF_UNKNOWN   (1<<27)
 #define RBF_SIZE      0x07ff
 #define RBF_LOCAL4    (1<<26)
 #define RBF_LOCAL3    (1<<25)
 #define RBF_LOCAL2    (1<<24)
 #define RBF_LOCAL1    (1<<23)

 #define RBF_FRAMEMAX CONFIG_SYS_RX_ETH_BUFFER
 #define RBF_FRAMELEN 0x600

 typedef struct {
 	unsigned long addr, size;
 } rbf_t;

 typedef struct {
 	rbf_t 		rbfdt[RBF_FRAMEMAX];
 	unsigned long	rbindex;
 } emac_device;

 void at91emac_EnableMDIO(at91_emac_t *at91mac)
 {
 	/* Mac CTRL reg set for MDIO enable */
 	writel(readl(&at91mac->ctl) | AT91_EMAC_CTL_MPE, &at91mac->ctl);
 }

 void at91emac_DisableMDIO(at91_emac_t *at91mac)
 {
 	/* Mac CTRL reg set for MDIO disable */
 	writel(readl(&at91mac->ctl) & ~AT91_EMAC_CTL_MPE, &at91mac->ctl);
 }

 int  at91emac_read(at91_emac_t *at91mac, unsigned char addr,
 		unsigned char reg, unsigned short *value)
 {
 	unsigned long netstat;
 	at91emac_EnableMDIO(at91mac);

 	writel(AT91_EMAC_MAN_HIGH | AT91_EMAC_MAN_RW_R |
 		AT91_EMAC_MAN_REGA(reg) | AT91_EMAC_MAN_CODE_802_3 |
 		AT91_EMAC_MAN_PHYA(addr),
 		&at91mac->man);

 	do {
 		netstat = readl(&at91mac->sr);
 		debug_cond(DEBUG_AT91PHY, "poll SR %08lx\n", netstat);
 	} while (!(netstat & AT91_EMAC_SR_IDLE));

 	*value = readl(&at91mac->man) & AT91_EMAC_MAN_DATA_MASK;

 	at91emac_DisableMDIO(at91mac);

 	debug_cond(DEBUG_AT91PHY,
 		"AT91PHY read %p REG(%d)=%x\n", at91mac, reg, *value);

 	return 0;
 }

 int  at91emac_write(at91_emac_t *at91mac, unsigned char addr,
 		unsigned char reg, unsigned short value)
 {
 	unsigned long netstat;
 	debug_cond(DEBUG_AT91PHY,
 		"AT91PHY write %p REG(%d)=%p\n", at91mac, reg, &value);

 	at91emac_EnableMDIO(at91mac);

 	writel(AT91_EMAC_MAN_HIGH | AT91_EMAC_MAN_RW_W |
 		AT91_EMAC_MAN_REGA(reg) | AT91_EMAC_MAN_CODE_802_3 |
 		AT91_EMAC_MAN_PHYA(addr) | (value & AT91_EMAC_MAN_DATA_MASK),
 		&at91mac->man);

 	do {
 		netstat = readl(&at91mac->sr);
 		debug_cond(DEBUG_AT91PHY, "poll SR %08lx\n", netstat);
 	} while (!(netstat & AT91_EMAC_SR_IDLE));

 	at91emac_DisableMDIO(at91mac);

 	return 0;
 }

 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)

 at91_emac_t *get_emacbase_by_name(const char *devname)
 {
 	struct eth_device *netdev;

 	netdev = eth_get_dev_by_name(devname);
 	return (at91_emac_t *) netdev->iobase;
 }

 int at91emac_mii_read(struct mii_dev *bus, int addr, int devad, int reg)
 {
 	unsigned short value = 0;
 	at91_emac_t *emac;

 	emac = get_emacbase_by_name(bus->name);
 	at91emac_read(emac , addr, reg, &value);
 	return value;
 }


 int at91emac_mii_write(struct mii_dev *bus, int addr, int devad, int reg,
 		       u16 value)
 {
 	at91_emac_t *emac;

 	emac = get_emacbase_by_name(bus->name);
 	at91emac_write(emac, addr, reg, value);
 	return 0;
 }

 #endif

 static int at91emac_phy_reset(struct eth_device *netdev)
 {
 	int i;
 	u16 status, adv;
 	at91_emac_t *emac;

 	emac = (at91_emac_t *) netdev->iobase;

 	adv = ADVERTISE_CSMA | ADVERTISE_ALL;
 	at91emac_write(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
 		MII_ADVERTISE, adv);
 	debug_cond(VERBOSEP, "%s: Starting autonegotiation...\n", netdev->name);
 	at91emac_write(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR, MII_BMCR,
 		(BMCR_ANENABLE | BMCR_ANRESTART));

 	for (i = 0; i < 30000; i++) {
 		at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
 			MII_BMSR, &status);
 		if (status & BMSR_ANEGCOMPLETE)
 			break;
 		udelay(100);
 	}

 	if (status & BMSR_ANEGCOMPLETE) {
 		debug_cond(VERBOSEP,
 			"%s: Autonegotiation complete\n", netdev->name);
 	} else {
 		printf("%s: Autonegotiation timed out (status=0x%04x)\n",
 		       netdev->name, status);
 		return -1;
 	}
 	return 0;
 }

 static int at91emac_phy_init(struct eth_device *netdev)
 {
 	u16 phy_id, status, adv, lpa;
 	int media, speed, duplex;
 	int i;
 	at91_emac_t *emac;

 	emac = (at91_emac_t *) netdev->iobase;

 	/* Check if the PHY is up to snuff... */
 	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
 		MII_PHYSID1, &phy_id);
 	if (phy_id == 0xffff) {
 		printf("%s: No PHY present\n", netdev->name);
 		return -1;
 	}

 	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
 		MII_BMSR, &status);

 	if (!(status & BMSR_LSTATUS)) {
 		/* Try to re-negotiate if we don't have link already. */
 		if (at91emac_phy_reset(netdev))
 			return -2;

 		for (i = 0; i < 100000 / 100; i++) {
 			at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
 				MII_BMSR, &status);
 			if (status & BMSR_LSTATUS)
 				break;
 			udelay(100);
 		}
 	}
 	if (!(status & BMSR_LSTATUS)) {
 		debug_cond(VERBOSEP, "%s: link down\n", netdev->name);
 		return -3;
 	} else {
 		at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
 			MII_ADVERTISE, &adv);
 		at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
 			MII_LPA, &lpa);
 		media = mii_nway_result(lpa & adv);
 		speed = (media & (ADVERTISE_100FULL | ADVERTISE_100HALF)
 			 ? 1 : 0);
 		duplex = (media & ADVERTISE_FULL) ? 1 : 0;
 		debug_cond(VERBOSEP, "%s: link up, %sMbps %s-duplex\n",
 		       netdev->name,
 		       speed ? "100" : "10",
 		       duplex ? "full" : "half");
 	}
 	return 0;
 }

 int at91emac_UpdateLinkSpeed(at91_emac_t *emac)
 {
 	unsigned short stat1;

 	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR, MII_BMSR, &stat1);

 	if (!(stat1 & BMSR_LSTATUS))	/* link status up? */
 		return -1;

 	if (stat1 & BMSR_100FULL) {
 		/*set Emac for 100BaseTX and Full Duplex  */
 		writel(readl(&emac->cfg) |
 			AT91_EMAC_CFG_SPD | AT91_EMAC_CFG_FD,
 			&emac->cfg);
 		return 0;
 	}

 	if (stat1 & BMSR_10FULL) {
 		/*set MII for 10BaseT and Full Duplex  */
 		writel((readl(&emac->cfg) &
 			~(AT91_EMAC_CFG_SPD | AT91_EMAC_CFG_FD)
 			) | AT91_EMAC_CFG_FD,
 			&emac->cfg);
 		return 0;
 	}

 	if (stat1 & BMSR_100HALF) {
 		/*set MII for 100BaseTX and Half Duplex  */
 		writel((readl(&emac->cfg) &
 			~(AT91_EMAC_CFG_SPD | AT91_EMAC_CFG_FD)
 			) | AT91_EMAC_CFG_SPD,
 			&emac->cfg);
 		return 0;
 	}

 	if (stat1 & BMSR_10HALF) {
 		/*set MII for 10BaseT and Half Duplex  */
 		writel((readl(&emac->cfg) &
 			~(AT91_EMAC_CFG_SPD | AT91_EMAC_CFG_FD)),
 			&emac->cfg);
 		return 0;
 	}
 	return 0;
 }

 static int at91emac_init(struct eth_device *netdev, bd_t *bd)
 {
 	int i;
 	u32 value;
 	emac_device *dev;
 	at91_emac_t *emac;
 	at91_pio_t *pio = (at91_pio_t *) ATMEL_BASE_PIO;

 	emac = (at91_emac_t *) netdev->iobase;
 	dev = (emac_device *) netdev->priv;

 	/* PIO Disable Register */
 	value =	ATMEL_PMX_AA_EMDIO |	ATMEL_PMX_AA_EMDC |
 		ATMEL_PMX_AA_ERXER |	ATMEL_PMX_AA_ERX1 |
 		ATMEL_PMX_AA_ERX0 |	ATMEL_PMX_AA_ECRS |
 		ATMEL_PMX_AA_ETX1 |	ATMEL_PMX_AA_ETX0 |
 		ATMEL_PMX_AA_ETXEN |	ATMEL_PMX_AA_EREFCK;

 	writel(value, &pio->pioa.pdr);
 	writel(value, &pio->pioa.mux.pio2.asr);

 #ifdef CONFIG_RMII
 	value = ATMEL_PMX_BA_ERXCK;
 #else
 	value = ATMEL_PMX_BA_ERXCK |	ATMEL_PMX_BA_ECOL |
 		ATMEL_PMX_BA_ERXDV |	ATMEL_PMX_BA_ERX3 |
 		ATMEL_PMX_BA_ERX2 |	ATMEL_PMX_BA_ETXER |
 		ATMEL_PMX_BA_ETX3 |	ATMEL_PMX_BA_ETX2;
 #endif
 	writel(value, &pio->piob.pdr);
 	writel(value, &pio->piob.mux.pio2.bsr);

 	at91_periph_clk_enable(ATMEL_ID_EMAC);

 	writel(readl(&emac->ctl) | AT91_EMAC_CTL_CSR, &emac->ctl);

 	/* Init Ethernet buffers */
 	for (i = 0; i < RBF_FRAMEMAX; i++) {
 		dev->rbfdt[i].addr = (unsigned long) net_rx_packets[i];
 		dev->rbfdt[i].size = 0;
 	}
 	dev->rbfdt[RBF_FRAMEMAX - 1].addr |= RBF_WRAP;
 	dev->rbindex = 0;
 	writel((u32) &(dev->rbfdt[0]), &emac->rbqp);

 	writel(readl(&emac->rsr) &
 		~(AT91_EMAC_RSR_OVR | AT91_EMAC_RSR_REC | AT91_EMAC_RSR_BNA),
 		&emac->rsr);

 	value = AT91_EMAC_CFG_CAF |	AT91_EMAC_CFG_NBC |
 		HCLK_DIV;
 #ifdef CONFIG_RMII
 	value |= AT91_EMAC_CFG_RMII;
 #endif
 	writel(value, &emac->cfg);

 	writel(readl(&emac->ctl) | AT91_EMAC_CTL_TE | AT91_EMAC_CTL_RE,
 		&emac->ctl);

 	if (!at91emac_phy_init(netdev)) {
 		at91emac_UpdateLinkSpeed(emac);
 		return 0;
 	}
 	return -1;
 }

 static void at91emac_halt(struct eth_device *netdev)
 {
 	at91_emac_t *emac;

 	emac = (at91_emac_t *) netdev->iobase;
 	writel(readl(&emac->ctl) & ~(AT91_EMAC_CTL_TE | AT91_EMAC_CTL_RE),
 		&emac->ctl);
 	debug_cond(DEBUG_AT91EMAC, "halt MAC\n");
 }

 static int at91emac_send(struct eth_device *netdev, void *packet, int length)
 {
 	at91_emac_t *emac;

 	emac = (at91_emac_t *) netdev->iobase;

 	while (!(readl(&emac->tsr) & AT91_EMAC_TSR_BNQ))
 		;
 	writel((u32) packet, &emac->tar);
 	writel(AT91_EMAC_TCR_LEN(length), &emac->tcr);
 	while (AT91_EMAC_TCR_LEN(readl(&emac->tcr)))
 		;
 	debug_cond(DEBUG_AT91EMAC, "Send %d\n", length);
 	writel(readl(&emac->tsr) | AT91_EMAC_TSR_COMP, &emac->tsr);
 	return 0;
 }

 static int at91emac_recv(struct eth_device *netdev)
 {
 	emac_device *dev;
 	at91_emac_t *emac;
 	rbf_t *rbfp;
 	int size;

 	emac = (at91_emac_t *) netdev->iobase;
 	dev = (emac_device *) netdev->priv;

 	rbfp = &dev->rbfdt[dev->rbindex];
 	while (rbfp->addr & RBF_OWNER)	{
 		size = rbfp->size & RBF_SIZE;
 		net_process_received_packet(net_rx_packets[dev->rbindex], size);

 		debug_cond(DEBUG_AT91EMAC, "Recv[%ld]: %d bytes @ %lx\n",
 			dev->rbindex, size, rbfp->addr);

 		rbfp->addr &= ~RBF_OWNER;
 		rbfp->size = 0;
 		if (dev->rbindex < (RBF_FRAMEMAX-1))
 			dev->rbindex++;
 		else
 			dev->rbindex = 0;

 		rbfp = &(dev->rbfdt[dev->rbindex]);
 		if (!(rbfp->addr & RBF_OWNER))
 			writel(readl(&emac->rsr) | AT91_EMAC_RSR_REC,
 				&emac->rsr);
 	}

 	if (readl(&emac->isr) & AT91_EMAC_IxR_RBNA) {
 		/* EMAC silicon bug 41.3.1 workaround 1 */
 		writel(readl(&emac->ctl) & ~AT91_EMAC_CTL_RE, &emac->ctl);
 		writel(readl(&emac->ctl) | AT91_EMAC_CTL_RE, &emac->ctl);
 		dev->rbindex = 0;
 		printf("%s: reset receiver (EMAC dead lock bug)\n",
 			netdev->name);
 	}
 	return 0;
 }

 static int at91emac_write_hwaddr(struct eth_device *netdev)
 {
 	at91_emac_t *emac;
 	emac = (at91_emac_t *) netdev->iobase;

 	at91_periph_clk_enable(ATMEL_ID_EMAC);

 	debug_cond(DEBUG_AT91EMAC,
 		"init MAC-ADDR %02x:%02x:%02x:%02x:%02x:%02x\n",
 		netdev->enetaddr[5], netdev->enetaddr[4], netdev->enetaddr[3],
 		netdev->enetaddr[2], netdev->enetaddr[1], netdev->enetaddr[0]);
 	writel( (netdev->enetaddr[0] | netdev->enetaddr[1] << 8 |
 			netdev->enetaddr[2] << 16 | netdev->enetaddr[3] << 24),
 			&emac->sa2l);
 	writel((netdev->enetaddr[4] | netdev->enetaddr[5] << 8), &emac->sa2h);
 	debug_cond(DEBUG_AT91EMAC, "init MAC-ADDR %x%x\n",
 		readl(&emac->sa2h), readl(&emac->sa2l));
 	return 0;
 }

 int at91emac_register(bd_t *bis, unsigned long iobase)
 {
 	emac_device *emac;
 	emac_device *emacfix;
 	struct eth_device *dev;

 	if (iobase == 0)
 		iobase = ATMEL_BASE_EMAC;
 	emac = malloc(sizeof(*emac)+512);
 	if (emac == NULL)
 		return -1;
 	dev = malloc(sizeof(*dev));
 	if (dev == NULL) {
 		free(emac);
 		return -1;
 	}
 	/* alignment as per Errata (64 bytes) is insufficient! */
 	emacfix = (emac_device *) (((unsigned long) emac + 0x1ff) & 0xFFFFFE00);
 	memset(emacfix, 0, sizeof(emac_device));

 	memset(dev, 0, sizeof(*dev));
 	strcpy(dev->name, "emac");
 	dev->iobase = iobase;
 	dev->priv = emacfix;
 	dev->init = at91emac_init;
 	dev->halt = at91emac_halt;
 	dev->send = at91emac_send;
 	dev->recv = at91emac_recv;
 	dev->write_hwaddr = at91emac_write_hwaddr;

 	eth_register(dev);

 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 	int retval;
 	struct mii_dev *mdiodev = mdio_alloc();
 	if (!mdiodev)
 		return -ENOMEM;
 	strncpy(mdiodev->name, dev->name, MDIO_NAME_LEN);
 	mdiodev->read = at91emac_mii_read;
 	mdiodev->write = at91emac_mii_write;

 	retval = mdio_register(mdiodev);
 	if (retval < 0)
 		return retval;
 #endif
 	return 1;
 }
	/*
	* Copyright (C) 2009 BuS Elektronik GmbH & Co. KG
	* Jens Scharsig (esw@bus-elektronik.de)
	*
	* (C) Copyright 2003
	* Author : Hamid Ikdoumi (Atmel)

	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <asm/io.h>
	#include <asm/arch/hardware.h>
	#include <asm/arch/at91_emac.h>
	#include <asm/arch/clk.h>
	#include <asm/arch/at91_pio.h>
	#include <net.h>
	#include <netdev.h>
	#include <malloc.h>
	#include <miiphy.h>
	#include <linux/mii.h>

	#undef MII_DEBUG
	#undef ET_DEBUG

	#if (CONFIG_SYS_RX_ETH_BUFFER > 1024)
	#error AT91 EMAC supports max 1024 RX buffers. \
	Please decrease the CONFIG_SYS_RX_ETH_BUFFER value
	#endif

	#ifndef CONFIG_DRIVER_AT91EMAC_PHYADDR
	#define CONFIG_DRIVER_AT91EMAC_PHYADDR 0
	#endif

	/* MDIO clock must not exceed 2.5 MHz, so enable MCK divider */
	#if (AT91C_MASTER_CLOCK > 80000000)
	#define HCLK_DIV AT91_EMAC_CFG_MCLK_64
	#elif (AT91C_MASTER_CLOCK > 40000000)
	#define HCLK_DIV AT91_EMAC_CFG_MCLK_32
	#elif (AT91C_MASTER_CLOCK > 20000000)
	#define HCLK_DIV AT91_EMAC_CFG_MCLK_16
	#else
	#define HCLK_DIV AT91_EMAC_CFG_MCLK_8
	#endif

	#ifdef ET_DEBUG
	#define DEBUG_AT91EMAC 1
	#else
	#define DEBUG_AT91EMAC 0
	#endif

	#ifdef MII_DEBUG
	#define DEBUG_AT91PHY 1
	#else
	#define DEBUG_AT91PHY 0
	#endif

	#ifndef CONFIG_DRIVER_AT91EMAC_QUIET
	#define VERBOSEP 1
	#else
	#define VERBOSEP 0
	#endif

	#define RBF_ADDR 0xfffffffc
	#define RBF_OWNER (1<<0)
	#define RBF_WRAP (1<<1)
	#define RBF_BROADCAST (1<<31)
	#define RBF_MULTICAST (1<<30)
	#define RBF_UNICAST (1<<29)
	#define RBF_EXTERNAL (1<<28)
	#define RBF_UNKNOWN (1<<27)
	#define RBF_SIZE 0x07ff
	#define RBF_LOCAL4 (1<<26)
	#define RBF_LOCAL3 (1<<25)
	#define RBF_LOCAL2 (1<<24)
	#define RBF_LOCAL1 (1<<23)

	#define RBF_FRAMEMAX CONFIG_SYS_RX_ETH_BUFFER
	#define RBF_FRAMELEN 0x600

	typedef struct {
	unsigned long addr, size;
	} rbf_t;

	typedef struct {
	rbf_t rbfdt[RBF_FRAMEMAX];
	unsigned long rbindex;
	} emac_device;

	void at91emac_EnableMDIO(at91_emac_t *at91mac)
	{
	/* Mac CTRL reg set for MDIO enable */
	writel(readl(&at91mac->ctl) \| AT91_EMAC_CTL_MPE, &at91mac->ctl);
	}

	void at91emac_DisableMDIO(at91_emac_t *at91mac)
	{
	/* Mac CTRL reg set for MDIO disable */
	writel(readl(&at91mac->ctl) & ~AT91_EMAC_CTL_MPE, &at91mac->ctl);
	}

	int at91emac_read(at91_emac_t *at91mac, unsigned char addr,
	unsigned char reg, unsigned short *value)
	{
	unsigned long netstat;
	at91emac_EnableMDIO(at91mac);

	writel(AT91_EMAC_MAN_HIGH \| AT91_EMAC_MAN_RW_R \|
	AT91_EMAC_MAN_REGA(reg) \| AT91_EMAC_MAN_CODE_802_3 \|
	AT91_EMAC_MAN_PHYA(addr),
	&at91mac->man);

	do {
	netstat = readl(&at91mac->sr);
	debug_cond(DEBUG_AT91PHY, "poll SR %08lx\n", netstat);
	} while (!(netstat & AT91_EMAC_SR_IDLE));

	*value = readl(&at91mac->man) & AT91_EMAC_MAN_DATA_MASK;

	at91emac_DisableMDIO(at91mac);

	debug_cond(DEBUG_AT91PHY,
	"AT91PHY read %p REG(%d)=%x\n", at91mac, reg, *value);

	return 0;
	}

	int at91emac_write(at91_emac_t *at91mac, unsigned char addr,
	unsigned char reg, unsigned short value)
	{
	unsigned long netstat;
	debug_cond(DEBUG_AT91PHY,
	"AT91PHY write %p REG(%d)=%p\n", at91mac, reg, &value);

	at91emac_EnableMDIO(at91mac);

	writel(AT91_EMAC_MAN_HIGH \| AT91_EMAC_MAN_RW_W \|
	AT91_EMAC_MAN_REGA(reg) \| AT91_EMAC_MAN_CODE_802_3 \|
	AT91_EMAC_MAN_PHYA(addr) \| (value & AT91_EMAC_MAN_DATA_MASK),
	&at91mac->man);

	do {
	netstat = readl(&at91mac->sr);
	debug_cond(DEBUG_AT91PHY, "poll SR %08lx\n", netstat);
	} while (!(netstat & AT91_EMAC_SR_IDLE));

	at91emac_DisableMDIO(at91mac);

	return 0;
	}

	#if defined(CONFIG_MII) \|\| defined(CONFIG_CMD_MII)

	at91_emac_t get_emacbase_by_name(const char devname)
	{
	struct eth_device *netdev;

	netdev = eth_get_dev_by_name(devname);
	return (at91_emac_t *) netdev->iobase;
	}

	int at91emac_mii_read(struct mii_dev *bus, int addr, int devad, int reg)
	{
	unsigned short value = 0;
	at91_emac_t *emac;

	emac = get_emacbase_by_name(bus->name);
	at91emac_read(emac , addr, reg, &value);
	return value;
	}


	int at91emac_mii_write(struct mii_dev *bus, int addr, int devad, int reg,
	u16 value)
	{
	at91_emac_t *emac;

	emac = get_emacbase_by_name(bus->name);
	at91emac_write(emac, addr, reg, value);
	return 0;
	}

	#endif

	static int at91emac_phy_reset(struct eth_device *netdev)
	{
	int i;
	u16 status, adv;
	at91_emac_t *emac;

	emac = (at91_emac_t *) netdev->iobase;

	adv = ADVERTISE_CSMA \| ADVERTISE_ALL;
	at91emac_write(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
	MII_ADVERTISE, adv);
	debug_cond(VERBOSEP, "%s: Starting autonegotiation...\n", netdev->name);
	at91emac_write(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR, MII_BMCR,
	(BMCR_ANENABLE \| BMCR_ANRESTART));

	for (i = 0; i < 30000; i++) {
	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
	MII_BMSR, &status);
	if (status & BMSR_ANEGCOMPLETE)
	break;
	udelay(100);
	}

	if (status & BMSR_ANEGCOMPLETE) {
	debug_cond(VERBOSEP,
	"%s: Autonegotiation complete\n", netdev->name);
	} else {
	printf("%s: Autonegotiation timed out (status=0x%04x)\n",
	netdev->name, status);
	return -1;
	}
	return 0;
	}

	static int at91emac_phy_init(struct eth_device *netdev)
	{
	u16 phy_id, status, adv, lpa;
	int media, speed, duplex;
	int i;
	at91_emac_t *emac;

	emac = (at91_emac_t *) netdev->iobase;

	/* Check if the PHY is up to snuff... */
	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
	MII_PHYSID1, &phy_id);
	if (phy_id == 0xffff) {
	printf("%s: No PHY present\n", netdev->name);
	return -1;
	}

	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
	MII_BMSR, &status);

	if (!(status & BMSR_LSTATUS)) {
	/* Try to re-negotiate if we don't have link already. */
	if (at91emac_phy_reset(netdev))
	return -2;

	for (i = 0; i < 100000 / 100; i++) {
	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
	MII_BMSR, &status);
	if (status & BMSR_LSTATUS)
	break;
	udelay(100);
	}
	}
	if (!(status & BMSR_LSTATUS)) {
	debug_cond(VERBOSEP, "%s: link down\n", netdev->name);
	return -3;
	} else {
	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
	MII_ADVERTISE, &adv);
	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR,
	MII_LPA, &lpa);
	media = mii_nway_result(lpa & adv);
	speed = (media & (ADVERTISE_100FULL \| ADVERTISE_100HALF)
	? 1 : 0);
	duplex = (media & ADVERTISE_FULL) ? 1 : 0;
	debug_cond(VERBOSEP, "%s: link up, %sMbps %s-duplex\n",
	netdev->name,
	speed ? "100" : "10",
	duplex ? "full" : "half");
	}
	return 0;
	}

	int at91emac_UpdateLinkSpeed(at91_emac_t *emac)
	{
	unsigned short stat1;

	at91emac_read(emac, CONFIG_DRIVER_AT91EMAC_PHYADDR, MII_BMSR, &stat1);

	if (!(stat1 & BMSR_LSTATUS)) /* link status up? */
	return -1;

	if (stat1 & BMSR_100FULL) {
	/set Emac for 100BaseTX and Full Duplex /
	writel(readl(&emac->cfg) \|
	AT91_EMAC_CFG_SPD \| AT91_EMAC_CFG_FD,
	&emac->cfg);
	return 0;
	}

	if (stat1 & BMSR_10FULL) {
	/set MII for 10BaseT and Full Duplex /
	writel((readl(&emac->cfg) &
	~(AT91_EMAC_CFG_SPD \| AT91_EMAC_CFG_FD)
	) \| AT91_EMAC_CFG_FD,
	&emac->cfg);
	return 0;
	}

	if (stat1 & BMSR_100HALF) {
	/set MII for 100BaseTX and Half Duplex /
	writel((readl(&emac->cfg) &
	~(AT91_EMAC_CFG_SPD \| AT91_EMAC_CFG_FD)
	) \| AT91_EMAC_CFG_SPD,
	&emac->cfg);
	return 0;
	}

	if (stat1 & BMSR_10HALF) {
	/set MII for 10BaseT and Half Duplex /
	writel((readl(&emac->cfg) &
	~(AT91_EMAC_CFG_SPD \| AT91_EMAC_CFG_FD)),
	&emac->cfg);
	return 0;
	}
	return 0;
	}

	static int at91emac_init(struct eth_device netdev, bd_t bd)
	{
	int i;
	u32 value;
	emac_device *dev;
	at91_emac_t *emac;
	at91_pio_t pio = (at91_pio_t ) ATMEL_BASE_PIO;

	emac = (at91_emac_t *) netdev->iobase;
	dev = (emac_device *) netdev->priv;

	/* PIO Disable Register */
	value = ATMEL_PMX_AA_EMDIO \| ATMEL_PMX_AA_EMDC \|
	ATMEL_PMX_AA_ERXER \| ATMEL_PMX_AA_ERX1 \|
	ATMEL_PMX_AA_ERX0 \| ATMEL_PMX_AA_ECRS \|
	ATMEL_PMX_AA_ETX1 \| ATMEL_PMX_AA_ETX0 \|
	ATMEL_PMX_AA_ETXEN \| ATMEL_PMX_AA_EREFCK;

	writel(value, &pio->pioa.pdr);
	writel(value, &pio->pioa.mux.pio2.asr);

	#ifdef CONFIG_RMII
	value = ATMEL_PMX_BA_ERXCK;
	#else
	value = ATMEL_PMX_BA_ERXCK \| ATMEL_PMX_BA_ECOL \|
	ATMEL_PMX_BA_ERXDV \| ATMEL_PMX_BA_ERX3 \|
	ATMEL_PMX_BA_ERX2 \| ATMEL_PMX_BA_ETXER \|
	ATMEL_PMX_BA_ETX3 \| ATMEL_PMX_BA_ETX2;
	#endif
	writel(value, &pio->piob.pdr);
	writel(value, &pio->piob.mux.pio2.bsr);

	at91_periph_clk_enable(ATMEL_ID_EMAC);

	writel(readl(&emac->ctl) \| AT91_EMAC_CTL_CSR, &emac->ctl);

	/* Init Ethernet buffers */
	for (i = 0; i < RBF_FRAMEMAX; i++) {
	dev->rbfdt[i].addr = (unsigned long) net_rx_packets[i];
	dev->rbfdt[i].size = 0;
	}
	dev->rbfdt[RBF_FRAMEMAX - 1].addr \|= RBF_WRAP;
	dev->rbindex = 0;
	writel((u32) &(dev->rbfdt[0]), &emac->rbqp);

	writel(readl(&emac->rsr) &
	~(AT91_EMAC_RSR_OVR \| AT91_EMAC_RSR_REC \| AT91_EMAC_RSR_BNA),
	&emac->rsr);

	value = AT91_EMAC_CFG_CAF \| AT91_EMAC_CFG_NBC \|
	HCLK_DIV;
	#ifdef CONFIG_RMII
	value \|= AT91_EMAC_CFG_RMII;
	#endif
	writel(value, &emac->cfg);

	writel(readl(&emac->ctl) \| AT91_EMAC_CTL_TE \| AT91_EMAC_CTL_RE,
	&emac->ctl);

	if (!at91emac_phy_init(netdev)) {
	at91emac_UpdateLinkSpeed(emac);
	return 0;
	}
	return -1;
	}

	static void at91emac_halt(struct eth_device *netdev)
	{
	at91_emac_t *emac;

	emac = (at91_emac_t *) netdev->iobase;
	writel(readl(&emac->ctl) & ~(AT91_EMAC_CTL_TE \| AT91_EMAC_CTL_RE),
	&emac->ctl);
	debug_cond(DEBUG_AT91EMAC, "halt MAC\n");
	}

	static int at91emac_send(struct eth_device netdev, void packet, int length)
	{
	at91_emac_t *emac;

	emac = (at91_emac_t *) netdev->iobase;

	while (!(readl(&emac->tsr) & AT91_EMAC_TSR_BNQ))
	;
	writel((u32) packet, &emac->tar);
	writel(AT91_EMAC_TCR_LEN(length), &emac->tcr);
	while (AT91_EMAC_TCR_LEN(readl(&emac->tcr)))
	;
	debug_cond(DEBUG_AT91EMAC, "Send %d\n", length);
	writel(readl(&emac->tsr) \| AT91_EMAC_TSR_COMP, &emac->tsr);
	return 0;
	}

	static int at91emac_recv(struct eth_device *netdev)
	{
	emac_device *dev;
	at91_emac_t *emac;
	rbf_t *rbfp;
	int size;

	emac = (at91_emac_t *) netdev->iobase;
	dev = (emac_device *) netdev->priv;

	rbfp = &dev->rbfdt[dev->rbindex];
	while (rbfp->addr & RBF_OWNER) {
	size = rbfp->size & RBF_SIZE;
	net_process_received_packet(net_rx_packets[dev->rbindex], size);

	debug_cond(DEBUG_AT91EMAC, "Recv[%ld]: %d bytes @ %lx\n",
	dev->rbindex, size, rbfp->addr);

	rbfp->addr &= ~RBF_OWNER;
	rbfp->size = 0;
	if (dev->rbindex < (RBF_FRAMEMAX-1))
	dev->rbindex++;
	else
	dev->rbindex = 0;

	rbfp = &(dev->rbfdt[dev->rbindex]);
	if (!(rbfp->addr & RBF_OWNER))
	writel(readl(&emac->rsr) \| AT91_EMAC_RSR_REC,
	&emac->rsr);
	}

	if (readl(&emac->isr) & AT91_EMAC_IxR_RBNA) {
	/* EMAC silicon bug 41.3.1 workaround 1 */
	writel(readl(&emac->ctl) & ~AT91_EMAC_CTL_RE, &emac->ctl);
	writel(readl(&emac->ctl) \| AT91_EMAC_CTL_RE, &emac->ctl);
	dev->rbindex = 0;
	printf("%s: reset receiver (EMAC dead lock bug)\n",
	netdev->name);
	}
	return 0;
	}

	static int at91emac_write_hwaddr(struct eth_device *netdev)
	{
	at91_emac_t *emac;
	emac = (at91_emac_t *) netdev->iobase;

	at91_periph_clk_enable(ATMEL_ID_EMAC);

	debug_cond(DEBUG_AT91EMAC,
	"init MAC-ADDR %02x:%02x:%02x:%02x:%02x:%02x\n",
	netdev->enetaddr[5], netdev->enetaddr[4], netdev->enetaddr[3],
	netdev->enetaddr[2], netdev->enetaddr[1], netdev->enetaddr[0]);
	writel( (netdev->enetaddr[0] \| netdev->enetaddr[1] << 8 \|
	netdev->enetaddr[2] << 16 \| netdev->enetaddr[3] << 24),
	&emac->sa2l);
	writel((netdev->enetaddr[4] \| netdev->enetaddr[5] << 8), &emac->sa2h);
	debug_cond(DEBUG_AT91EMAC, "init MAC-ADDR %x%x\n",
	readl(&emac->sa2h), readl(&emac->sa2l));
	return 0;
	}

	int at91emac_register(bd_t *bis, unsigned long iobase)
	{
	emac_device *emac;
	emac_device *emacfix;
	struct eth_device *dev;

	if (iobase == 0)
	iobase = ATMEL_BASE_EMAC;
	emac = malloc(sizeof(*emac)+512);
	if (emac == NULL)
	return -1;
	dev = malloc(sizeof(*dev));
	if (dev == NULL) {
	free(emac);
	return -1;
	}
	/* alignment as per Errata (64 bytes) is insufficient! */
	emacfix = (emac_device *) (((unsigned long) emac + 0x1ff) & 0xFFFFFE00);
	memset(emacfix, 0, sizeof(emac_device));

	memset(dev, 0, sizeof(*dev));
	strcpy(dev->name, "emac");
	dev->iobase = iobase;
	dev->priv = emacfix;
	dev->init = at91emac_init;
	dev->halt = at91emac_halt;
	dev->send = at91emac_send;
	dev->recv = at91emac_recv;
	dev->write_hwaddr = at91emac_write_hwaddr;

	eth_register(dev);

	#if defined(CONFIG_MII) \|\| defined(CONFIG_CMD_MII)
	int retval;
	struct mii_dev *mdiodev = mdio_alloc();
	if (!mdiodev)
	return -ENOMEM;
	strncpy(mdiodev->name, dev->name, MDIO_NAME_LEN);
	mdiodev->read = at91emac_mii_read;
	mdiodev->write = at91emac_mii_write;

	retval = mdio_register(mdiodev);
	if (retval < 0)
	return retval;
	#endif
	return 1;
	}