drivers/net/ibm_emac/ibm_emac_phy.c - maze/linux - Git at Google

 /*
  * drivers/net/ibm_emac/ibm_emac_phy.c
  *
  * Driver for PowerPC 4xx on-chip ethernet controller, PHY support.
  * Borrowed from sungem_phy.c, though I only kept the generic MII
  * driver for now.
  *
  * This file should be shared with other drivers or eventually
  * merged as the "low level" part of miilib
  *
  * (c) 2003, Benjamin Herrenscmidt (benh@kernel.crashing.org)
  * (c) 2004-2005, Eugene Surovegin <ebs@ebshome.net>
  *
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/netdevice.h>
 #include <linux/mii.h>
 #include <linux/ethtool.h>
 #include <linux/delay.h>

 #include <asm/ocp.h>

 #include "ibm_emac_phy.h"

 static inline int phy_read(struct mii_phy *phy, int reg)
 {
 	return phy->mdio_read(phy->dev, phy->address, reg);
 }

 static inline void phy_write(struct mii_phy *phy, int reg, int val)
 {
 	phy->mdio_write(phy->dev, phy->address, reg, val);
 }

 int mii_reset_phy(struct mii_phy *phy)
 {
 	int val;
 	int limit = 10000;

 	val = phy_read(phy, MII_BMCR);
 	val &= ~BMCR_ISOLATE;
 	val |= BMCR_RESET;
 	phy_write(phy, MII_BMCR, val);

 	udelay(300);

 	while (limit--) {
 		val = phy_read(phy, MII_BMCR);
 		if (val >= 0 && (val & BMCR_RESET) == 0)
 			break;
 		udelay(10);
 	}
 	if ((val & BMCR_ISOLATE) && limit > 0)
 		phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);

 	return limit <= 0;
 }

 static int genmii_setup_aneg(struct mii_phy *phy, u32 advertise)
 {
 	int ctl, adv;

 	phy->autoneg = AUTONEG_ENABLE;
 	phy->speed = SPEED_10;
 	phy->duplex = DUPLEX_HALF;
 	phy->pause = phy->asym_pause = 0;
 	phy->advertising = advertise;

 	/* Setup standard advertise */
 	adv = phy_read(phy, MII_ADVERTISE);
 	if (adv < 0)
 		return adv;
 	adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
 		 ADVERTISE_PAUSE_ASYM);
 	if (advertise & ADVERTISED_10baseT_Half)
 		adv |= ADVERTISE_10HALF;
 	if (advertise & ADVERTISED_10baseT_Full)
 		adv |= ADVERTISE_10FULL;
 	if (advertise & ADVERTISED_100baseT_Half)
 		adv |= ADVERTISE_100HALF;
 	if (advertise & ADVERTISED_100baseT_Full)
 		adv |= ADVERTISE_100FULL;
 	if (advertise & ADVERTISED_Pause)
 		adv |= ADVERTISE_PAUSE_CAP;
 	if (advertise & ADVERTISED_Asym_Pause)
 		adv |= ADVERTISE_PAUSE_ASYM;
 	phy_write(phy, MII_ADVERTISE, adv);

 	if (phy->features &
 	    (SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
 		adv = phy_read(phy, MII_CTRL1000);
 		if (adv < 0)
 			return adv;
 		adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
 		if (advertise & ADVERTISED_1000baseT_Full)
 			adv |= ADVERTISE_1000FULL;
 		if (advertise & ADVERTISED_1000baseT_Half)
 			adv |= ADVERTISE_1000HALF;
 		phy_write(phy, MII_CTRL1000, adv);
 	}

 	/* Start/Restart aneg */
 	ctl = phy_read(phy, MII_BMCR);
 	ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
 	phy_write(phy, MII_BMCR, ctl);

 	return 0;
 }

 static int genmii_setup_forced(struct mii_phy *phy, int speed, int fd)
 {
 	int ctl;

 	phy->autoneg = AUTONEG_DISABLE;
 	phy->speed = speed;
 	phy->duplex = fd;
 	phy->pause = phy->asym_pause = 0;

 	ctl = phy_read(phy, MII_BMCR);
 	if (ctl < 0)
 		return ctl;
 	ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_ANENABLE);

 	/* First reset the PHY */
 	phy_write(phy, MII_BMCR, ctl | BMCR_RESET);

 	/* Select speed & duplex */
 	switch (speed) {
 	case SPEED_10:
 		break;
 	case SPEED_100:
 		ctl |= BMCR_SPEED100;
 		break;
 	case SPEED_1000:
 		ctl |= BMCR_SPEED1000;
 		break;
 	default:
 		return -EINVAL;
 	}
 	if (fd == DUPLEX_FULL)
 		ctl |= BMCR_FULLDPLX;
 	phy_write(phy, MII_BMCR, ctl);

 	return 0;
 }

 static int genmii_poll_link(struct mii_phy *phy)
 {
 	int status;

 	/* Clear latched value with dummy read */
 	phy_read(phy, MII_BMSR);
 	status = phy_read(phy, MII_BMSR);
 	if (status < 0 || (status & BMSR_LSTATUS) == 0)
 		return 0;
 	if (phy->autoneg == AUTONEG_ENABLE && !(status & BMSR_ANEGCOMPLETE))
 		return 0;
 	return 1;
 }

 static int genmii_read_link(struct mii_phy *phy)
 {
 	if (phy->autoneg == AUTONEG_ENABLE) {
 		int glpa = 0;
 		int lpa = phy_read(phy, MII_LPA) & phy_read(phy, MII_ADVERTISE);
 		if (lpa < 0)
 			return lpa;

 		if (phy->features &
 		    (SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
 			int adv = phy_read(phy, MII_CTRL1000);
 			glpa = phy_read(phy, MII_STAT1000);

 			if (glpa < 0 || adv < 0)
 				return adv;

 			glpa &= adv << 2;
 		}

 		phy->speed = SPEED_10;
 		phy->duplex = DUPLEX_HALF;
 		phy->pause = phy->asym_pause = 0;

 		if (glpa & (LPA_1000FULL | LPA_1000HALF)) {
 			phy->speed = SPEED_1000;
 			if (glpa & LPA_1000FULL)
 				phy->duplex = DUPLEX_FULL;
 		} else if (lpa & (LPA_100FULL | LPA_100HALF)) {
 			phy->speed = SPEED_100;
 			if (lpa & LPA_100FULL)
 				phy->duplex = DUPLEX_FULL;
 		} else if (lpa & LPA_10FULL)
 			phy->duplex = DUPLEX_FULL;

 		if (phy->duplex == DUPLEX_FULL) {
 			phy->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
 			phy->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
 		}
 	} else {
 		int bmcr = phy_read(phy, MII_BMCR);
 		if (bmcr < 0)
 			return bmcr;

 		if (bmcr & BMCR_FULLDPLX)
 			phy->duplex = DUPLEX_FULL;
 		else
 			phy->duplex = DUPLEX_HALF;
 		if (bmcr & BMCR_SPEED1000)
 			phy->speed = SPEED_1000;
 		else if (bmcr & BMCR_SPEED100)
 			phy->speed = SPEED_100;
 		else
 			phy->speed = SPEED_10;

 		phy->pause = phy->asym_pause = 0;
 	}
 	return 0;
 }

 /* Generic implementation for most 10/100/1000 PHYs */
 static struct mii_phy_ops generic_phy_ops = {
 	.setup_aneg	= genmii_setup_aneg,
 	.setup_forced	= genmii_setup_forced,
 	.poll_link	= genmii_poll_link,
 	.read_link	= genmii_read_link
 };

 static struct mii_phy_def genmii_phy_def = {
 	.phy_id		= 0x00000000,
 	.phy_id_mask	= 0x00000000,
 	.name		= "Generic MII",
 	.ops		= &generic_phy_ops
 };

 /* CIS8201 */
 #define MII_CIS8201_10BTCSR	0x16
 #define  TENBTCSR_ECHO_DISABLE	0x2000
 #define MII_CIS8201_EPCR	0x17
 #define  EPCR_MODE_MASK		0x3000
 #define  EPCR_GMII_MODE		0x0000
 #define  EPCR_RGMII_MODE	0x1000
 #define  EPCR_TBI_MODE		0x2000
 #define  EPCR_RTBI_MODE		0x3000
 #define MII_CIS8201_ACSR	0x1c
 #define  ACSR_PIN_PRIO_SELECT	0x0004

 static int cis8201_init(struct mii_phy *phy)
 {
 	int epcr;

 	epcr = phy_read(phy, MII_CIS8201_EPCR);
 	if (epcr < 0)
 		return epcr;

 	epcr &= ~EPCR_MODE_MASK;

 	switch (phy->mode) {
 	case PHY_MODE_TBI:
 		epcr |= EPCR_TBI_MODE;
 		break;
 	case PHY_MODE_RTBI:
 		epcr |= EPCR_RTBI_MODE;
 		break;
 	case PHY_MODE_GMII:
 		epcr |= EPCR_GMII_MODE;
 		break;
 	case PHY_MODE_RGMII:
 	default:
 		epcr |= EPCR_RGMII_MODE;
 	}

 	phy_write(phy, MII_CIS8201_EPCR, epcr);

 	/* MII regs override strap pins */
 	phy_write(phy, MII_CIS8201_ACSR,
 		  phy_read(phy, MII_CIS8201_ACSR) | ACSR_PIN_PRIO_SELECT);

 	/* Disable TX_EN -> CRS echo mode, otherwise 10/HDX doesn't work */
 	phy_write(phy, MII_CIS8201_10BTCSR,
 		  phy_read(phy, MII_CIS8201_10BTCSR) | TENBTCSR_ECHO_DISABLE);

 	return 0;
 }

 static struct mii_phy_ops cis8201_phy_ops = {
 	.init		= cis8201_init,
 	.setup_aneg	= genmii_setup_aneg,
 	.setup_forced	= genmii_setup_forced,
 	.poll_link	= genmii_poll_link,
 	.read_link	= genmii_read_link
 };

 static struct mii_phy_def cis8201_phy_def = {
 	.phy_id		= 0x000fc410,
 	.phy_id_mask	= 0x000ffff0,
 	.name		= "CIS8201 Gigabit Ethernet",
 	.ops		= &cis8201_phy_ops
 };

 static struct mii_phy_def *mii_phy_table[] = {
 	&cis8201_phy_def,
 	&genmii_phy_def,
 	NULL
 };

 int mii_phy_probe(struct mii_phy *phy, int address)
 {
 	struct mii_phy_def *def;
 	int i;
 	u32 id;

 	phy->autoneg = AUTONEG_DISABLE;
 	phy->advertising = 0;
 	phy->address = address;
 	phy->speed = SPEED_10;
 	phy->duplex = DUPLEX_HALF;
 	phy->pause = phy->asym_pause = 0;

 	/* Take PHY out of isolate mode and reset it. */
 	if (mii_reset_phy(phy))
 		return -ENODEV;

 	/* Read ID and find matching entry */
 	id = (phy_read(phy, MII_PHYSID1) << 16) | phy_read(phy, MII_PHYSID2);
 	for (i = 0; (def = mii_phy_table[i]) != NULL; i++)
 		if ((id & def->phy_id_mask) == def->phy_id)
 			break;
 	/* Should never be NULL (we have a generic entry), but... */
 	if (!def)
 		return -ENODEV;

 	phy->def = def;

 	/* Determine PHY features if needed */
 	phy->features = def->features;
 	if (!phy->features) {
 		u16 bmsr = phy_read(phy, MII_BMSR);
 		if (bmsr & BMSR_ANEGCAPABLE)
 			phy->features |= SUPPORTED_Autoneg;
 		if (bmsr & BMSR_10HALF)
 			phy->features |= SUPPORTED_10baseT_Half;
 		if (bmsr & BMSR_10FULL)
 			phy->features |= SUPPORTED_10baseT_Full;
 		if (bmsr & BMSR_100HALF)
 			phy->features |= SUPPORTED_100baseT_Half;
 		if (bmsr & BMSR_100FULL)
 			phy->features |= SUPPORTED_100baseT_Full;
 		if (bmsr & BMSR_ESTATEN) {
 			u16 esr = phy_read(phy, MII_ESTATUS);
 			if (esr & ESTATUS_1000_TFULL)
 				phy->features |= SUPPORTED_1000baseT_Full;
 			if (esr & ESTATUS_1000_THALF)
 				phy->features |= SUPPORTED_1000baseT_Half;
 		}
 		phy->features |= SUPPORTED_MII;
 	}

 	/* Setup default advertising */
 	phy->advertising = phy->features;

 	return 0;
 }

 MODULE_LICENSE("GPL");
	/*
	* drivers/net/ibm_emac/ibm_emac_phy.c
	*
	* Driver for PowerPC 4xx on-chip ethernet controller, PHY support.
	* Borrowed from sungem_phy.c, though I only kept the generic MII
	* driver for now.
	*
	* This file should be shared with other drivers or eventually
	* merged as the "low level" part of miilib
	*
	* (c) 2003, Benjamin Herrenscmidt (benh@kernel.crashing.org)
	* (c) 2004-2005, Eugene Surovegin <ebs@ebshome.net>
	*
	*/
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/netdevice.h>
	#include <linux/mii.h>
	#include <linux/ethtool.h>
	#include <linux/delay.h>

	#include <asm/ocp.h>

	#include "ibm_emac_phy.h"

	static inline int phy_read(struct mii_phy *phy, int reg)
	{
	return phy->mdio_read(phy->dev, phy->address, reg);
	}

	static inline void phy_write(struct mii_phy *phy, int reg, int val)
	{
	phy->mdio_write(phy->dev, phy->address, reg, val);
	}

	int mii_reset_phy(struct mii_phy *phy)
	{
	int val;
	int limit = 10000;

	val = phy_read(phy, MII_BMCR);
	val &= ~BMCR_ISOLATE;
	val \|= BMCR_RESET;
	phy_write(phy, MII_BMCR, val);

	udelay(300);

	while (limit--) {
	val = phy_read(phy, MII_BMCR);
	if (val >= 0 && (val & BMCR_RESET) == 0)
	break;
	udelay(10);
	}
	if ((val & BMCR_ISOLATE) && limit > 0)
	phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);

	return limit <= 0;
	}

	static int genmii_setup_aneg(struct mii_phy *phy, u32 advertise)
	{
	int ctl, adv;

	phy->autoneg = AUTONEG_ENABLE;
	phy->speed = SPEED_10;
	phy->duplex = DUPLEX_HALF;
	phy->pause = phy->asym_pause = 0;
	phy->advertising = advertise;

	/* Setup standard advertise */
	adv = phy_read(phy, MII_ADVERTISE);
	if (adv < 0)
	return adv;
	adv &= ~(ADVERTISE_ALL \| ADVERTISE_100BASE4 \| ADVERTISE_PAUSE_CAP \|
	ADVERTISE_PAUSE_ASYM);
	if (advertise & ADVERTISED_10baseT_Half)
	adv \|= ADVERTISE_10HALF;
	if (advertise & ADVERTISED_10baseT_Full)
	adv \|= ADVERTISE_10FULL;
	if (advertise & ADVERTISED_100baseT_Half)
	adv \|= ADVERTISE_100HALF;
	if (advertise & ADVERTISED_100baseT_Full)
	adv \|= ADVERTISE_100FULL;
	if (advertise & ADVERTISED_Pause)
	adv \|= ADVERTISE_PAUSE_CAP;
	if (advertise & ADVERTISED_Asym_Pause)
	adv \|= ADVERTISE_PAUSE_ASYM;
	phy_write(phy, MII_ADVERTISE, adv);

	if (phy->features &
	(SUPPORTED_1000baseT_Full \| SUPPORTED_1000baseT_Half)) {
	adv = phy_read(phy, MII_CTRL1000);
	if (adv < 0)
	return adv;
	adv &= ~(ADVERTISE_1000FULL \| ADVERTISE_1000HALF);
	if (advertise & ADVERTISED_1000baseT_Full)
	adv \|= ADVERTISE_1000FULL;
	if (advertise & ADVERTISED_1000baseT_Half)
	adv \|= ADVERTISE_1000HALF;
	phy_write(phy, MII_CTRL1000, adv);
	}

	/* Start/Restart aneg */
	ctl = phy_read(phy, MII_BMCR);
	ctl \|= (BMCR_ANENABLE \| BMCR_ANRESTART);
	phy_write(phy, MII_BMCR, ctl);

	return 0;
	}

	static int genmii_setup_forced(struct mii_phy *phy, int speed, int fd)
	{
	int ctl;

	phy->autoneg = AUTONEG_DISABLE;
	phy->speed = speed;
	phy->duplex = fd;
	phy->pause = phy->asym_pause = 0;

	ctl = phy_read(phy, MII_BMCR);
	if (ctl < 0)
	return ctl;
	ctl &= ~(BMCR_FULLDPLX \| BMCR_SPEED100 \| BMCR_ANENABLE);

	/* First reset the PHY */
	phy_write(phy, MII_BMCR, ctl \| BMCR_RESET);

	/* Select speed & duplex */
	switch (speed) {
	case SPEED_10:
	break;
	case SPEED_100:
	ctl \|= BMCR_SPEED100;
	break;
	case SPEED_1000:
	ctl \|= BMCR_SPEED1000;
	break;
	default:
	return -EINVAL;
	}
	if (fd == DUPLEX_FULL)
	ctl \|= BMCR_FULLDPLX;
	phy_write(phy, MII_BMCR, ctl);

	return 0;
	}

	static int genmii_poll_link(struct mii_phy *phy)
	{
	int status;

	/* Clear latched value with dummy read */
	phy_read(phy, MII_BMSR);
	status = phy_read(phy, MII_BMSR);
	if (status < 0 \|\| (status & BMSR_LSTATUS) == 0)
	return 0;
	if (phy->autoneg == AUTONEG_ENABLE && !(status & BMSR_ANEGCOMPLETE))
	return 0;
	return 1;
	}

	static int genmii_read_link(struct mii_phy *phy)
	{
	if (phy->autoneg == AUTONEG_ENABLE) {
	int glpa = 0;
	int lpa = phy_read(phy, MII_LPA) & phy_read(phy, MII_ADVERTISE);
	if (lpa < 0)
	return lpa;

	if (phy->features &
	(SUPPORTED_1000baseT_Full \| SUPPORTED_1000baseT_Half)) {
	int adv = phy_read(phy, MII_CTRL1000);
	glpa = phy_read(phy, MII_STAT1000);

	if (glpa < 0 \|\| adv < 0)
	return adv;

	glpa &= adv << 2;
	}

	phy->speed = SPEED_10;
	phy->duplex = DUPLEX_HALF;
	phy->pause = phy->asym_pause = 0;

	if (glpa & (LPA_1000FULL \| LPA_1000HALF)) {
	phy->speed = SPEED_1000;
	if (glpa & LPA_1000FULL)
	phy->duplex = DUPLEX_FULL;
	} else if (lpa & (LPA_100FULL \| LPA_100HALF)) {
	phy->speed = SPEED_100;
	if (lpa & LPA_100FULL)
	phy->duplex = DUPLEX_FULL;
	} else if (lpa & LPA_10FULL)
	phy->duplex = DUPLEX_FULL;

	if (phy->duplex == DUPLEX_FULL) {
	phy->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
	phy->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
	}
	} else {
	int bmcr = phy_read(phy, MII_BMCR);
	if (bmcr < 0)
	return bmcr;

	if (bmcr & BMCR_FULLDPLX)
	phy->duplex = DUPLEX_FULL;
	else
	phy->duplex = DUPLEX_HALF;
	if (bmcr & BMCR_SPEED1000)
	phy->speed = SPEED_1000;
	else if (bmcr & BMCR_SPEED100)
	phy->speed = SPEED_100;
	else
	phy->speed = SPEED_10;

	phy->pause = phy->asym_pause = 0;
	}
	return 0;
	}

	/* Generic implementation for most 10/100/1000 PHYs */
	static struct mii_phy_ops generic_phy_ops = {
	.setup_aneg = genmii_setup_aneg,
	.setup_forced = genmii_setup_forced,
	.poll_link = genmii_poll_link,
	.read_link = genmii_read_link
	};

	static struct mii_phy_def genmii_phy_def = {
	.phy_id = 0x00000000,
	.phy_id_mask = 0x00000000,
	.name = "Generic MII",
	.ops = &generic_phy_ops
	};

	/* CIS8201 */
	#define MII_CIS8201_10BTCSR 0x16
	#define TENBTCSR_ECHO_DISABLE 0x2000
	#define MII_CIS8201_EPCR 0x17
	#define EPCR_MODE_MASK 0x3000
	#define EPCR_GMII_MODE 0x0000
	#define EPCR_RGMII_MODE 0x1000
	#define EPCR_TBI_MODE 0x2000
	#define EPCR_RTBI_MODE 0x3000
	#define MII_CIS8201_ACSR 0x1c
	#define ACSR_PIN_PRIO_SELECT 0x0004

	static int cis8201_init(struct mii_phy *phy)
	{
	int epcr;

	epcr = phy_read(phy, MII_CIS8201_EPCR);
	if (epcr < 0)
	return epcr;

	epcr &= ~EPCR_MODE_MASK;

	switch (phy->mode) {
	case PHY_MODE_TBI:
	epcr \|= EPCR_TBI_MODE;
	break;
	case PHY_MODE_RTBI:
	epcr \|= EPCR_RTBI_MODE;
	break;
	case PHY_MODE_GMII:
	epcr \|= EPCR_GMII_MODE;
	break;
	case PHY_MODE_RGMII:
	default:
	epcr \|= EPCR_RGMII_MODE;
	}

	phy_write(phy, MII_CIS8201_EPCR, epcr);

	/* MII regs override strap pins */
	phy_write(phy, MII_CIS8201_ACSR,
	phy_read(phy, MII_CIS8201_ACSR) \| ACSR_PIN_PRIO_SELECT);

	/* Disable TX_EN -> CRS echo mode, otherwise 10/HDX doesn't work */
	phy_write(phy, MII_CIS8201_10BTCSR,
	phy_read(phy, MII_CIS8201_10BTCSR) \| TENBTCSR_ECHO_DISABLE);

	return 0;
	}

	static struct mii_phy_ops cis8201_phy_ops = {
	.init = cis8201_init,
	.setup_aneg = genmii_setup_aneg,
	.setup_forced = genmii_setup_forced,
	.poll_link = genmii_poll_link,
	.read_link = genmii_read_link
	};

	static struct mii_phy_def cis8201_phy_def = {
	.phy_id = 0x000fc410,
	.phy_id_mask = 0x000ffff0,
	.name = "CIS8201 Gigabit Ethernet",
	.ops = &cis8201_phy_ops
	};

	static struct mii_phy_def *mii_phy_table[] = {
	&cis8201_phy_def,
	&genmii_phy_def,
	NULL
	};

	int mii_phy_probe(struct mii_phy *phy, int address)
	{
	struct mii_phy_def *def;
	int i;
	u32 id;

	phy->autoneg = AUTONEG_DISABLE;
	phy->advertising = 0;
	phy->address = address;
	phy->speed = SPEED_10;
	phy->duplex = DUPLEX_HALF;
	phy->pause = phy->asym_pause = 0;

	/* Take PHY out of isolate mode and reset it. */
	if (mii_reset_phy(phy))
	return -ENODEV;

	/* Read ID and find matching entry */
	id = (phy_read(phy, MII_PHYSID1) << 16) \| phy_read(phy, MII_PHYSID2);
	for (i = 0; (def = mii_phy_table[i]) != NULL; i++)
	if ((id & def->phy_id_mask) == def->phy_id)
	break;
	/* Should never be NULL (we have a generic entry), but... */
	if (!def)
	return -ENODEV;

	phy->def = def;

	/* Determine PHY features if needed */
	phy->features = def->features;
	if (!phy->features) {
	u16 bmsr = phy_read(phy, MII_BMSR);
	if (bmsr & BMSR_ANEGCAPABLE)
	phy->features \|= SUPPORTED_Autoneg;
	if (bmsr & BMSR_10HALF)
	phy->features \|= SUPPORTED_10baseT_Half;
	if (bmsr & BMSR_10FULL)
	phy->features \|= SUPPORTED_10baseT_Full;
	if (bmsr & BMSR_100HALF)
	phy->features \|= SUPPORTED_100baseT_Half;
	if (bmsr & BMSR_100FULL)
	phy->features \|= SUPPORTED_100baseT_Full;
	if (bmsr & BMSR_ESTATEN) {
	u16 esr = phy_read(phy, MII_ESTATUS);
	if (esr & ESTATUS_1000_TFULL)
	phy->features \|= SUPPORTED_1000baseT_Full;
	if (esr & ESTATUS_1000_THALF)
	phy->features \|= SUPPORTED_1000baseT_Half;
	}
	phy->features \|= SUPPORTED_MII;
	}

	/* Setup default advertising */
	phy->advertising = phy->features;

	return 0;
	}

	MODULE_LICENSE("GPL");