drivers/net/gianfar_phy.c - kernel/msm-4.9 - Gitiles

 /*
  * drivers/net/gianfar_phy.c
  *
  * Gianfar Ethernet Driver -- PHY handling
  * Driver for FEC on MPC8540 and TSEC on MPC8540/MPC8560
  * Based on 8260_io/fcc_enet.c
  *
  * Author: Andy Fleming
  * Maintainer: Kumar Gala (kumar.gala@freescale.com)
  *
  * Copyright (c) 2002-2004 Freescale Semiconductor, Inc.
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  *
  */

 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/skbuff.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>

 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/uaccess.h>
 #include <linux/module.h>
 #include <linux/version.h>
 #include <linux/crc32.h>
 #include <linux/mii.h>

 #include "gianfar.h"
 #include "gianfar_phy.h"

 static void config_genmii_advert(struct gfar_mii_info *mii_info);
 static void genmii_setup_forced(struct gfar_mii_info *mii_info);
 static void genmii_restart_aneg(struct gfar_mii_info *mii_info);
 static int gbit_config_aneg(struct gfar_mii_info *mii_info);
 static int genmii_config_aneg(struct gfar_mii_info *mii_info);
 static int genmii_update_link(struct gfar_mii_info *mii_info);
 static int genmii_read_status(struct gfar_mii_info *mii_info);
 u16 phy_read(struct gfar_mii_info *mii_info, u16 regnum);
 void phy_write(struct gfar_mii_info *mii_info, u16 regnum, u16 val);

 /* Write value to the PHY for this device to the register at regnum, */
 /* waiting until the write is done before it returns.  All PHY */
 /* configuration has to be done through the TSEC1 MIIM regs */
 void write_phy_reg(struct net_device *dev, int mii_id, int regnum, int value)
 {
 	struct gfar_private *priv = netdev_priv(dev);
 	struct gfar *regbase = priv->phyregs;

 	/* Set the PHY address and the register address we want to write */
 	gfar_write(&regbase->miimadd, (mii_id << 8) | regnum);

 	/* Write out the value we want */
 	gfar_write(&regbase->miimcon, value);

 	/* Wait for the transaction to finish */
 	while (gfar_read(&regbase->miimind) & MIIMIND_BUSY)
 		cpu_relax();
 }

 /* Reads from register regnum in the PHY for device dev, */
 /* returning the value.  Clears miimcom first.  All PHY */
 /* configuration has to be done through the TSEC1 MIIM regs */
 int read_phy_reg(struct net_device *dev, int mii_id, int regnum)
 {
 	struct gfar_private *priv = netdev_priv(dev);
 	struct gfar *regbase = priv->phyregs;
 	u16 value;

 	/* Set the PHY address and the register address we want to read */
 	gfar_write(&regbase->miimadd, (mii_id << 8) | regnum);

 	/* Clear miimcom, and then initiate a read */
 	gfar_write(&regbase->miimcom, 0);
 	gfar_write(&regbase->miimcom, MII_READ_COMMAND);

 	/* Wait for the transaction to finish */
 	while (gfar_read(&regbase->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
 		cpu_relax();

 	/* Grab the value of the register from miimstat */
 	value = gfar_read(&regbase->miimstat);

 	return value;
 }

 void mii_clear_phy_interrupt(struct gfar_mii_info *mii_info)
 {
 	if(mii_info->phyinfo->ack_interrupt)
 		mii_info->phyinfo->ack_interrupt(mii_info);
 }


 void mii_configure_phy_interrupt(struct gfar_mii_info *mii_info, u32 interrupts)
 {
 	mii_info->interrupts = interrupts;
 	if(mii_info->phyinfo->config_intr)
 		mii_info->phyinfo->config_intr(mii_info);
 }


 /* Writes MII_ADVERTISE with the appropriate values, after
  * sanitizing advertise to make sure only supported features
  * are advertised
  */
 static void config_genmii_advert(struct gfar_mii_info *mii_info)
 {
 	u32 advertise;
 	u16 adv;

 	/* Only allow advertising what this PHY supports */
 	mii_info->advertising &= mii_info->phyinfo->features;
 	advertise = mii_info->advertising;

 	/* Setup standard advertisement */
 	adv = phy_read(mii_info, MII_ADVERTISE);
 	adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4);
 	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;
 	phy_write(mii_info, MII_ADVERTISE, adv);
 }

 static void genmii_setup_forced(struct gfar_mii_info *mii_info)
 {
 	u16 ctrl;
 	u32 features = mii_info->phyinfo->features;

 	ctrl = phy_read(mii_info, MII_BMCR);

 	ctrl &= ~(BMCR_FULLDPLX|BMCR_SPEED100|BMCR_SPEED1000|BMCR_ANENABLE);
 	ctrl |= BMCR_RESET;

 	switch(mii_info->speed) {
 		case SPEED_1000:
 			if(features & (SUPPORTED_1000baseT_Half
 						| SUPPORTED_1000baseT_Full)) {
 				ctrl |= BMCR_SPEED1000;
 				break;
 			}
 			mii_info->speed = SPEED_100;
 		case SPEED_100:
 			if (features & (SUPPORTED_100baseT_Half
 						| SUPPORTED_100baseT_Full)) {
 				ctrl |= BMCR_SPEED100;
 				break;
 			}
 			mii_info->speed = SPEED_10;
 		case SPEED_10:
 			if (features & (SUPPORTED_10baseT_Half
 						| SUPPORTED_10baseT_Full))
 				break;
 		default: /* Unsupported speed! */
 			printk(KERN_ERR "%s: Bad speed!\n",
 					mii_info->dev->name);
 			break;
 	}

 	phy_write(mii_info, MII_BMCR, ctrl);
 }


 /* Enable and Restart Autonegotiation */
 static void genmii_restart_aneg(struct gfar_mii_info *mii_info)
 {
 	u16 ctl;

 	ctl = phy_read(mii_info, MII_BMCR);
 	ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
 	phy_write(mii_info, MII_BMCR, ctl);
 }


 static int gbit_config_aneg(struct gfar_mii_info *mii_info)
 {
 	u16 adv;
 	u32 advertise;

 	if(mii_info->autoneg) {
 		/* Configure the ADVERTISE register */
 		config_genmii_advert(mii_info);
 		advertise = mii_info->advertising;

 		adv = phy_read(mii_info, MII_1000BASETCONTROL);
 		adv &= ~(MII_1000BASETCONTROL_FULLDUPLEXCAP |
 				MII_1000BASETCONTROL_HALFDUPLEXCAP);
 		if (advertise & SUPPORTED_1000baseT_Half)
 			adv |= MII_1000BASETCONTROL_HALFDUPLEXCAP;
 		if (advertise & SUPPORTED_1000baseT_Full)
 			adv |= MII_1000BASETCONTROL_FULLDUPLEXCAP;
 		phy_write(mii_info, MII_1000BASETCONTROL, adv);

 		/* Start/Restart aneg */
 		genmii_restart_aneg(mii_info);
 	} else
 		genmii_setup_forced(mii_info);

 	return 0;
 }

 static int marvell_config_aneg(struct gfar_mii_info *mii_info)
 {
 	/* The Marvell PHY has an errata which requires
 	 * that certain registers get written in order
 	 * to restart autonegotiation */
 	phy_write(mii_info, MII_BMCR, BMCR_RESET);

 	phy_write(mii_info, 0x1d, 0x1f);
 	phy_write(mii_info, 0x1e, 0x200c);
 	phy_write(mii_info, 0x1d, 0x5);
 	phy_write(mii_info, 0x1e, 0);
 	phy_write(mii_info, 0x1e, 0x100);

 	gbit_config_aneg(mii_info);

 	return 0;
 }
 static int genmii_config_aneg(struct gfar_mii_info *mii_info)
 {
 	if (mii_info->autoneg) {
 		config_genmii_advert(mii_info);
 		genmii_restart_aneg(mii_info);
 	} else
 		genmii_setup_forced(mii_info);

 	return 0;
 }


 static int genmii_update_link(struct gfar_mii_info *mii_info)
 {
 	u16 status;

 	/* Do a fake read */
 	phy_read(mii_info, MII_BMSR);

 	/* Read link and autonegotiation status */
 	status = phy_read(mii_info, MII_BMSR);
 	if ((status & BMSR_LSTATUS) == 0)
 		mii_info->link = 0;
 	else
 		mii_info->link = 1;

 	/* If we are autonegotiating, and not done,
 	 * return an error */
 	if (mii_info->autoneg && !(status & BMSR_ANEGCOMPLETE))
 		return -EAGAIN;

 	return 0;
 }

 static int genmii_read_status(struct gfar_mii_info *mii_info)
 {
 	u16 status;
 	int err;

 	/* Update the link, but return if there
 	 * was an error */
 	err = genmii_update_link(mii_info);
 	if (err)
 		return err;

 	if (mii_info->autoneg) {
 		status = phy_read(mii_info, MII_LPA);

 		if (status & (LPA_10FULL | LPA_100FULL))
 			mii_info->duplex = DUPLEX_FULL;
 		else
 			mii_info->duplex = DUPLEX_HALF;
 		if (status & (LPA_100FULL | LPA_100HALF))
 			mii_info->speed = SPEED_100;
 		else
 			mii_info->speed = SPEED_10;
 		mii_info->pause = 0;
 	}
 	/* On non-aneg, we assume what we put in BMCR is the speed,
 	 * though magic-aneg shouldn't prevent this case from occurring
 	 */

 	return 0;
 }
 static int marvell_read_status(struct gfar_mii_info *mii_info)
 {
 	u16 status;
 	int err;

 	/* Update the link, but return if there
 	 * was an error */
 	err = genmii_update_link(mii_info);
 	if (err)
 		return err;

 	/* If the link is up, read the speed and duplex */
 	/* If we aren't autonegotiating, assume speeds
 	 * are as set */
 	if (mii_info->autoneg && mii_info->link) {
 		int speed;
 		status = phy_read(mii_info, MII_M1011_PHY_SPEC_STATUS);

 #if 0
 		/* If speed and duplex aren't resolved,
 		 * return an error.  Isn't this handled
 		 * by checking aneg?
 		 */
 		if ((status & MII_M1011_PHY_SPEC_STATUS_RESOLVED) == 0)
 			return -EAGAIN;
 #endif

 		/* Get the duplexity */
 		if (status & MII_M1011_PHY_SPEC_STATUS_FULLDUPLEX)
 			mii_info->duplex = DUPLEX_FULL;
 		else
 			mii_info->duplex = DUPLEX_HALF;

 		/* Get the speed */
 		speed = status & MII_M1011_PHY_SPEC_STATUS_SPD_MASK;
 		switch(speed) {
 			case MII_M1011_PHY_SPEC_STATUS_1000:
 				mii_info->speed = SPEED_1000;
 				break;
 			case MII_M1011_PHY_SPEC_STATUS_100:
 				mii_info->speed = SPEED_100;
 				break;
 			default:
 				mii_info->speed = SPEED_10;
 				break;
 		}
 		mii_info->pause = 0;
 	}

 	return 0;
 }


 static int cis820x_read_status(struct gfar_mii_info *mii_info)
 {
 	u16 status;
 	int err;

 	/* Update the link, but return if there
 	 * was an error */
 	err = genmii_update_link(mii_info);
 	if (err)
 		return err;

 	/* If the link is up, read the speed and duplex */
 	/* If we aren't autonegotiating, assume speeds
 	 * are as set */
 	if (mii_info->autoneg && mii_info->link) {
 		int speed;

 		status = phy_read(mii_info, MII_CIS8201_AUX_CONSTAT);
 		if (status & MII_CIS8201_AUXCONSTAT_DUPLEX)
 			mii_info->duplex = DUPLEX_FULL;
 		else
 			mii_info->duplex = DUPLEX_HALF;

 		speed = status & MII_CIS8201_AUXCONSTAT_SPEED;

 		switch (speed) {
 		case MII_CIS8201_AUXCONSTAT_GBIT:
 			mii_info->speed = SPEED_1000;
 			break;
 		case MII_CIS8201_AUXCONSTAT_100:
 			mii_info->speed = SPEED_100;
 			break;
 		default:
 			mii_info->speed = SPEED_10;
 			break;
 		}
 	}

 	return 0;
 }

 static int marvell_ack_interrupt(struct gfar_mii_info *mii_info)
 {
 	/* Clear the interrupts by reading the reg */
 	phy_read(mii_info, MII_M1011_IEVENT);

 	return 0;
 }

 static int marvell_config_intr(struct gfar_mii_info *mii_info)
 {
 	if(mii_info->interrupts == MII_INTERRUPT_ENABLED)
 		phy_write(mii_info, MII_M1011_IMASK, MII_M1011_IMASK_INIT);
 	else
 		phy_write(mii_info, MII_M1011_IMASK, MII_M1011_IMASK_CLEAR);

 	return 0;
 }

 static int cis820x_init(struct gfar_mii_info *mii_info)
 {
 	phy_write(mii_info, MII_CIS8201_AUX_CONSTAT,
 			MII_CIS8201_AUXCONSTAT_INIT);
 	phy_write(mii_info, MII_CIS8201_EXT_CON1,
 			MII_CIS8201_EXTCON1_INIT);

 	return 0;
 }

 static int cis820x_ack_interrupt(struct gfar_mii_info *mii_info)
 {
 	phy_read(mii_info, MII_CIS8201_ISTAT);

 	return 0;
 }

 static int cis820x_config_intr(struct gfar_mii_info *mii_info)
 {
 	if(mii_info->interrupts == MII_INTERRUPT_ENABLED)
 		phy_write(mii_info, MII_CIS8201_IMASK, MII_CIS8201_IMASK_MASK);
 	else
 		phy_write(mii_info, MII_CIS8201_IMASK, 0);

 	return 0;
 }

 #define DM9161_DELAY 10

 static int dm9161_read_status(struct gfar_mii_info *mii_info)
 {
 	u16 status;
 	int err;

 	/* Update the link, but return if there
 	 * was an error */
 	err = genmii_update_link(mii_info);
 	if (err)
 		return err;

 	/* If the link is up, read the speed and duplex */
 	/* If we aren't autonegotiating, assume speeds
 	 * are as set */
 	if (mii_info->autoneg && mii_info->link) {
 		status = phy_read(mii_info, MII_DM9161_SCSR);
 		if (status & (MII_DM9161_SCSR_100F | MII_DM9161_SCSR_100H))
 			mii_info->speed = SPEED_100;
 		else
 			mii_info->speed = SPEED_10;

 		if (status & (MII_DM9161_SCSR_100F | MII_DM9161_SCSR_10F))
 			mii_info->duplex = DUPLEX_FULL;
 		else
 			mii_info->duplex = DUPLEX_HALF;
 	}

 	return 0;
 }


 static int dm9161_config_aneg(struct gfar_mii_info *mii_info)
 {
 	struct dm9161_private *priv = mii_info->priv;

 	if(0 == priv->resetdone)
 		return -EAGAIN;

 	return 0;
 }

 static void dm9161_timer(unsigned long data)
 {
 	struct gfar_mii_info *mii_info = (struct gfar_mii_info *)data;
 	struct dm9161_private *priv = mii_info->priv;
 	u16 status = phy_read(mii_info, MII_BMSR);

 	if (status & BMSR_ANEGCOMPLETE) {
 		priv->resetdone = 1;
 	} else
 		mod_timer(&priv->timer, jiffies + DM9161_DELAY * HZ);
 }

 static int dm9161_init(struct gfar_mii_info *mii_info)
 {
 	struct dm9161_private *priv;

 	/* Allocate the private data structure */
 	priv = kmalloc(sizeof(struct dm9161_private), GFP_KERNEL);

 	if (NULL == priv)
 		return -ENOMEM;

 	mii_info->priv = priv;

 	/* Reset is not done yet */
 	priv->resetdone = 0;

 	/* Isolate the PHY */
 	phy_write(mii_info, MII_BMCR, BMCR_ISOLATE);

 	/* Do not bypass the scrambler/descrambler */
 	phy_write(mii_info, MII_DM9161_SCR, MII_DM9161_SCR_INIT);

 	/* Clear 10BTCSR to default */
 	phy_write(mii_info, MII_DM9161_10BTCSR, MII_DM9161_10BTCSR_INIT);

 	/* Reconnect the PHY, and enable Autonegotiation */
 	phy_write(mii_info, MII_BMCR, BMCR_ANENABLE);

 	/* Start a timer for DM9161_DELAY seconds to wait
 	 * for the PHY to be ready */
 	init_timer(&priv->timer);
 	priv->timer.function = &dm9161_timer;
 	priv->timer.data = (unsigned long) mii_info;
 	mod_timer(&priv->timer, jiffies + DM9161_DELAY * HZ);

 	return 0;
 }

 static void dm9161_close(struct gfar_mii_info *mii_info)
 {
 	struct dm9161_private *priv = mii_info->priv;

 	del_timer_sync(&priv->timer);
 	kfree(priv);
 }

 #if 0
 static int dm9161_ack_interrupt(struct gfar_mii_info *mii_info)
 {
 	phy_read(mii_info, MII_DM9161_INTR);

 	return 0;
 }
 #endif

 /* Cicada 820x */
 static struct phy_info phy_info_cis820x = {
 	0x000fc440,
 	"Cicada Cis8204",
 	0x000fffc0,
 	.features	= MII_GBIT_FEATURES,
 	.init		= &cis820x_init,
 	.config_aneg	= &gbit_config_aneg,
 	.read_status	= &cis820x_read_status,
 	.ack_interrupt	= &cis820x_ack_interrupt,
 	.config_intr	= &cis820x_config_intr,
 };

 static struct phy_info phy_info_dm9161 = {
 	.phy_id		= 0x0181b880,
 	.name		= "Davicom DM9161E",
 	.phy_id_mask	= 0x0ffffff0,
 	.init		= dm9161_init,
 	.config_aneg	= dm9161_config_aneg,
 	.read_status	= dm9161_read_status,
 	.close		= dm9161_close,
 };

 static struct phy_info phy_info_marvell = {
 	.phy_id		= 0x01410c00,
 	.phy_id_mask	= 0xffffff00,
 	.name		= "Marvell 88E1101/88E1111",
 	.features	= MII_GBIT_FEATURES,
 	.config_aneg	= &marvell_config_aneg,
 	.read_status	= &marvell_read_status,
 	.ack_interrupt	= &marvell_ack_interrupt,
 	.config_intr	= &marvell_config_intr,
 };

 static struct phy_info phy_info_genmii= {
 	.phy_id		= 0x00000000,
 	.phy_id_mask	= 0x00000000,
 	.name		= "Generic MII",
 	.features	= MII_BASIC_FEATURES,
 	.config_aneg	= genmii_config_aneg,
 	.read_status	= genmii_read_status,
 };

 static struct phy_info *phy_info[] = {
 	&phy_info_cis820x,
 	&phy_info_marvell,
 	&phy_info_dm9161,
 	&phy_info_genmii,
 	NULL
 };

 u16 phy_read(struct gfar_mii_info *mii_info, u16 regnum)
 {
 	u16 retval;
 	unsigned long flags;

 	spin_lock_irqsave(&mii_info->mdio_lock, flags);
 	retval = mii_info->mdio_read(mii_info->dev, mii_info->mii_id, regnum);
 	spin_unlock_irqrestore(&mii_info->mdio_lock, flags);

 	return retval;
 }

 void phy_write(struct gfar_mii_info *mii_info, u16 regnum, u16 val)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&mii_info->mdio_lock, flags);
 	mii_info->mdio_write(mii_info->dev,
 			mii_info->mii_id,
 			regnum, val);
 	spin_unlock_irqrestore(&mii_info->mdio_lock, flags);
 }

 /* Use the PHY ID registers to determine what type of PHY is attached
  * to device dev.  return a struct phy_info structure describing that PHY
  */
 struct phy_info * get_phy_info(struct gfar_mii_info *mii_info)
 {
 	u16 phy_reg;
 	u32 phy_ID;
 	int i;
 	struct phy_info *theInfo = NULL;
 	struct net_device *dev = mii_info->dev;

 	/* Grab the bits from PHYIR1, and put them in the upper half */
 	phy_reg = phy_read(mii_info, MII_PHYSID1);
 	phy_ID = (phy_reg & 0xffff) << 16;

 	/* Grab the bits from PHYIR2, and put them in the lower half */
 	phy_reg = phy_read(mii_info, MII_PHYSID2);
 	phy_ID |= (phy_reg & 0xffff);

 	/* loop through all the known PHY types, and find one that */
 	/* matches the ID we read from the PHY. */
 	for (i = 0; phy_info[i]; i++)
 		if (phy_info[i]->phy_id ==
 				(phy_ID & phy_info[i]->phy_id_mask)) {
 			theInfo = phy_info[i];
 			break;
 		}

 	/* This shouldn't happen, as we have generic PHY support */
 	if (theInfo == NULL) {
 		printk("%s: PHY id %x is not supported!\n", dev->name, phy_ID);
 		return NULL;
 	} else {
 		printk("%s: PHY is %s (%x)\n", dev->name, theInfo->name,
 		       phy_ID);
 	}

 	return theInfo;
 }
	/*
	* drivers/net/gianfar_phy.c
	*
	* Gianfar Ethernet Driver -- PHY handling
	* Driver for FEC on MPC8540 and TSEC on MPC8540/MPC8560
	* Based on 8260_io/fcc_enet.c
	*
	* Author: Andy Fleming
	* Maintainer: Kumar Gala (kumar.gala@freescale.com)
	*
	* Copyright (c) 2002-2004 Freescale Semiconductor, Inc.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	*/

	#include <linux/config.h>
	#include <linux/kernel.h>
	#include <linux/sched.h>
	#include <linux/string.h>
	#include <linux/errno.h>
	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/netdevice.h>
	#include <linux/etherdevice.h>
	#include <linux/skbuff.h>
	#include <linux/spinlock.h>
	#include <linux/mm.h>

	#include <asm/io.h>
	#include <asm/irq.h>
	#include <asm/uaccess.h>
	#include <linux/module.h>
	#include <linux/version.h>
	#include <linux/crc32.h>
	#include <linux/mii.h>

	#include "gianfar.h"
	#include "gianfar_phy.h"

	static void config_genmii_advert(struct gfar_mii_info *mii_info);
	static void genmii_setup_forced(struct gfar_mii_info *mii_info);
	static void genmii_restart_aneg(struct gfar_mii_info *mii_info);
	static int gbit_config_aneg(struct gfar_mii_info *mii_info);
	static int genmii_config_aneg(struct gfar_mii_info *mii_info);
	static int genmii_update_link(struct gfar_mii_info *mii_info);
	static int genmii_read_status(struct gfar_mii_info *mii_info);
	u16 phy_read(struct gfar_mii_info *mii_info, u16 regnum);
	void phy_write(struct gfar_mii_info *mii_info, u16 regnum, u16 val);

	/* Write value to the PHY for this device to the register at regnum, */
	/* waiting until the write is done before it returns. All PHY */
	/* configuration has to be done through the TSEC1 MIIM regs */
	void write_phy_reg(struct net_device *dev, int mii_id, int regnum, int value)
	{
	struct gfar_private *priv = netdev_priv(dev);
	struct gfar *regbase = priv->phyregs;

	/* Set the PHY address and the register address we want to write */
	gfar_write(&regbase->miimadd, (mii_id << 8) \| regnum);

	/* Write out the value we want */
	gfar_write(&regbase->miimcon, value);

	/* Wait for the transaction to finish */
	while (gfar_read(&regbase->miimind) & MIIMIND_BUSY)
	cpu_relax();
	}

	/* Reads from register regnum in the PHY for device dev, */
	/* returning the value. Clears miimcom first. All PHY */
	/* configuration has to be done through the TSEC1 MIIM regs */
	int read_phy_reg(struct net_device *dev, int mii_id, int regnum)
	{
	struct gfar_private *priv = netdev_priv(dev);
	struct gfar *regbase = priv->phyregs;
	u16 value;

	/* Set the PHY address and the register address we want to read */
	gfar_write(&regbase->miimadd, (mii_id << 8) \| regnum);

	/* Clear miimcom, and then initiate a read */
	gfar_write(&regbase->miimcom, 0);
	gfar_write(&regbase->miimcom, MII_READ_COMMAND);

	/* Wait for the transaction to finish */
	while (gfar_read(&regbase->miimind) & (MIIMIND_NOTVALID \| MIIMIND_BUSY))
	cpu_relax();

	/* Grab the value of the register from miimstat */
	value = gfar_read(&regbase->miimstat);

	return value;
	}

	void mii_clear_phy_interrupt(struct gfar_mii_info *mii_info)
	{
	if(mii_info->phyinfo->ack_interrupt)
	mii_info->phyinfo->ack_interrupt(mii_info);
	}


	void mii_configure_phy_interrupt(struct gfar_mii_info *mii_info, u32 interrupts)
	{
	mii_info->interrupts = interrupts;
	if(mii_info->phyinfo->config_intr)
	mii_info->phyinfo->config_intr(mii_info);
	}


	/* Writes MII_ADVERTISE with the appropriate values, after
	* sanitizing advertise to make sure only supported features
	* are advertised
	*/
	static void config_genmii_advert(struct gfar_mii_info *mii_info)
	{
	u32 advertise;
	u16 adv;

	/* Only allow advertising what this PHY supports */
	mii_info->advertising &= mii_info->phyinfo->features;
	advertise = mii_info->advertising;

	/* Setup standard advertisement */
	adv = phy_read(mii_info, MII_ADVERTISE);
	adv &= ~(ADVERTISE_ALL \| ADVERTISE_100BASE4);
	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;
	phy_write(mii_info, MII_ADVERTISE, adv);
	}

	static void genmii_setup_forced(struct gfar_mii_info *mii_info)
	{
	u16 ctrl;
	u32 features = mii_info->phyinfo->features;

	ctrl = phy_read(mii_info, MII_BMCR);

	ctrl &= ~(BMCR_FULLDPLX\|BMCR_SPEED100\|BMCR_SPEED1000\|BMCR_ANENABLE);
	ctrl \|= BMCR_RESET;

	switch(mii_info->speed) {
	case SPEED_1000:
	if(features & (SUPPORTED_1000baseT_Half
	\| SUPPORTED_1000baseT_Full)) {
	ctrl \|= BMCR_SPEED1000;
	break;
	}
	mii_info->speed = SPEED_100;
	case SPEED_100:
	if (features & (SUPPORTED_100baseT_Half
	\| SUPPORTED_100baseT_Full)) {
	ctrl \|= BMCR_SPEED100;
	break;
	}
	mii_info->speed = SPEED_10;
	case SPEED_10:
	if (features & (SUPPORTED_10baseT_Half
	\| SUPPORTED_10baseT_Full))
	break;
	default: /* Unsupported speed! */
	printk(KERN_ERR "%s: Bad speed!\n",
	mii_info->dev->name);
	break;
	}

	phy_write(mii_info, MII_BMCR, ctrl);
	}


	/* Enable and Restart Autonegotiation */
	static void genmii_restart_aneg(struct gfar_mii_info *mii_info)
	{
	u16 ctl;

	ctl = phy_read(mii_info, MII_BMCR);
	ctl \|= (BMCR_ANENABLE \| BMCR_ANRESTART);
	phy_write(mii_info, MII_BMCR, ctl);
	}


	static int gbit_config_aneg(struct gfar_mii_info *mii_info)
	{
	u16 adv;
	u32 advertise;

	if(mii_info->autoneg) {
	/* Configure the ADVERTISE register */
	config_genmii_advert(mii_info);
	advertise = mii_info->advertising;

	adv = phy_read(mii_info, MII_1000BASETCONTROL);
	adv &= ~(MII_1000BASETCONTROL_FULLDUPLEXCAP \|
	MII_1000BASETCONTROL_HALFDUPLEXCAP);
	if (advertise & SUPPORTED_1000baseT_Half)
	adv \|= MII_1000BASETCONTROL_HALFDUPLEXCAP;
	if (advertise & SUPPORTED_1000baseT_Full)
	adv \|= MII_1000BASETCONTROL_FULLDUPLEXCAP;
	phy_write(mii_info, MII_1000BASETCONTROL, adv);

	/* Start/Restart aneg */
	genmii_restart_aneg(mii_info);
	} else
	genmii_setup_forced(mii_info);

	return 0;
	}

	static int marvell_config_aneg(struct gfar_mii_info *mii_info)
	{
	/* The Marvell PHY has an errata which requires
	* that certain registers get written in order
	* to restart autonegotiation */
	phy_write(mii_info, MII_BMCR, BMCR_RESET);

	phy_write(mii_info, 0x1d, 0x1f);
	phy_write(mii_info, 0x1e, 0x200c);
	phy_write(mii_info, 0x1d, 0x5);
	phy_write(mii_info, 0x1e, 0);
	phy_write(mii_info, 0x1e, 0x100);

	gbit_config_aneg(mii_info);

	return 0;
	}
	static int genmii_config_aneg(struct gfar_mii_info *mii_info)
	{
	if (mii_info->autoneg) {
	config_genmii_advert(mii_info);
	genmii_restart_aneg(mii_info);
	} else
	genmii_setup_forced(mii_info);

	return 0;
	}


	static int genmii_update_link(struct gfar_mii_info *mii_info)
	{
	u16 status;

	/* Do a fake read */
	phy_read(mii_info, MII_BMSR);

	/* Read link and autonegotiation status */
	status = phy_read(mii_info, MII_BMSR);
	if ((status & BMSR_LSTATUS) == 0)
	mii_info->link = 0;
	else
	mii_info->link = 1;

	/* If we are autonegotiating, and not done,
	* return an error */
	if (mii_info->autoneg && !(status & BMSR_ANEGCOMPLETE))
	return -EAGAIN;

	return 0;
	}

	static int genmii_read_status(struct gfar_mii_info *mii_info)
	{
	u16 status;
	int err;

	/* Update the link, but return if there
	* was an error */
	err = genmii_update_link(mii_info);
	if (err)
	return err;

	if (mii_info->autoneg) {
	status = phy_read(mii_info, MII_LPA);

	if (status & (LPA_10FULL \| LPA_100FULL))
	mii_info->duplex = DUPLEX_FULL;
	else
	mii_info->duplex = DUPLEX_HALF;
	if (status & (LPA_100FULL \| LPA_100HALF))
	mii_info->speed = SPEED_100;
	else
	mii_info->speed = SPEED_10;
	mii_info->pause = 0;
	}
	/* On non-aneg, we assume what we put in BMCR is the speed,
	* though magic-aneg shouldn't prevent this case from occurring
	*/

	return 0;
	}
	static int marvell_read_status(struct gfar_mii_info *mii_info)
	{
	u16 status;
	int err;

	/* Update the link, but return if there
	* was an error */
	err = genmii_update_link(mii_info);
	if (err)
	return err;

	/* If the link is up, read the speed and duplex */
	/* If we aren't autonegotiating, assume speeds
	* are as set */
	if (mii_info->autoneg && mii_info->link) {
	int speed;
	status = phy_read(mii_info, MII_M1011_PHY_SPEC_STATUS);

	#if 0
	/* If speed and duplex aren't resolved,
	* return an error. Isn't this handled
	* by checking aneg?
	*/
	if ((status & MII_M1011_PHY_SPEC_STATUS_RESOLVED) == 0)
	return -EAGAIN;
	#endif

	/* Get the duplexity */
	if (status & MII_M1011_PHY_SPEC_STATUS_FULLDUPLEX)
	mii_info->duplex = DUPLEX_FULL;
	else
	mii_info->duplex = DUPLEX_HALF;

	/* Get the speed */
	speed = status & MII_M1011_PHY_SPEC_STATUS_SPD_MASK;
	switch(speed) {
	case MII_M1011_PHY_SPEC_STATUS_1000:
	mii_info->speed = SPEED_1000;
	break;
	case MII_M1011_PHY_SPEC_STATUS_100:
	mii_info->speed = SPEED_100;
	break;
	default:
	mii_info->speed = SPEED_10;
	break;
	}
	mii_info->pause = 0;
	}

	return 0;
	}


	static int cis820x_read_status(struct gfar_mii_info *mii_info)
	{
	u16 status;
	int err;

	/* Update the link, but return if there
	* was an error */
	err = genmii_update_link(mii_info);
	if (err)
	return err;

	/* If the link is up, read the speed and duplex */
	/* If we aren't autonegotiating, assume speeds
	* are as set */
	if (mii_info->autoneg && mii_info->link) {
	int speed;

	status = phy_read(mii_info, MII_CIS8201_AUX_CONSTAT);
	if (status & MII_CIS8201_AUXCONSTAT_DUPLEX)
	mii_info->duplex = DUPLEX_FULL;
	else
	mii_info->duplex = DUPLEX_HALF;

	speed = status & MII_CIS8201_AUXCONSTAT_SPEED;

	switch (speed) {
	case MII_CIS8201_AUXCONSTAT_GBIT:
	mii_info->speed = SPEED_1000;
	break;
	case MII_CIS8201_AUXCONSTAT_100:
	mii_info->speed = SPEED_100;
	break;
	default:
	mii_info->speed = SPEED_10;
	break;
	}
	}

	return 0;
	}

	static int marvell_ack_interrupt(struct gfar_mii_info *mii_info)
	{
	/* Clear the interrupts by reading the reg */
	phy_read(mii_info, MII_M1011_IEVENT);

	return 0;
	}

	static int marvell_config_intr(struct gfar_mii_info *mii_info)
	{
	if(mii_info->interrupts == MII_INTERRUPT_ENABLED)
	phy_write(mii_info, MII_M1011_IMASK, MII_M1011_IMASK_INIT);
	else
	phy_write(mii_info, MII_M1011_IMASK, MII_M1011_IMASK_CLEAR);

	return 0;
	}

	static int cis820x_init(struct gfar_mii_info *mii_info)
	{
	phy_write(mii_info, MII_CIS8201_AUX_CONSTAT,
	MII_CIS8201_AUXCONSTAT_INIT);
	phy_write(mii_info, MII_CIS8201_EXT_CON1,
	MII_CIS8201_EXTCON1_INIT);

	return 0;
	}

	static int cis820x_ack_interrupt(struct gfar_mii_info *mii_info)
	{
	phy_read(mii_info, MII_CIS8201_ISTAT);

	return 0;
	}

	static int cis820x_config_intr(struct gfar_mii_info *mii_info)
	{
	if(mii_info->interrupts == MII_INTERRUPT_ENABLED)
	phy_write(mii_info, MII_CIS8201_IMASK, MII_CIS8201_IMASK_MASK);
	else
	phy_write(mii_info, MII_CIS8201_IMASK, 0);

	return 0;
	}

	#define DM9161_DELAY 10

	static int dm9161_read_status(struct gfar_mii_info *mii_info)
	{
	u16 status;
	int err;

	/* Update the link, but return if there
	* was an error */
	err = genmii_update_link(mii_info);
	if (err)
	return err;

	/* If the link is up, read the speed and duplex */
	/* If we aren't autonegotiating, assume speeds
	* are as set */
	if (mii_info->autoneg && mii_info->link) {
	status = phy_read(mii_info, MII_DM9161_SCSR);
	if (status & (MII_DM9161_SCSR_100F \| MII_DM9161_SCSR_100H))
	mii_info->speed = SPEED_100;
	else
	mii_info->speed = SPEED_10;

	if (status & (MII_DM9161_SCSR_100F \| MII_DM9161_SCSR_10F))
	mii_info->duplex = DUPLEX_FULL;
	else
	mii_info->duplex = DUPLEX_HALF;
	}

	return 0;
	}


	static int dm9161_config_aneg(struct gfar_mii_info *mii_info)
	{
	struct dm9161_private *priv = mii_info->priv;

	if(0 == priv->resetdone)
	return -EAGAIN;

	return 0;
	}

	static void dm9161_timer(unsigned long data)
	{
	struct gfar_mii_info mii_info = (struct gfar_mii_info )data;
	struct dm9161_private *priv = mii_info->priv;
	u16 status = phy_read(mii_info, MII_BMSR);

	if (status & BMSR_ANEGCOMPLETE) {
	priv->resetdone = 1;
	} else
	mod_timer(&priv->timer, jiffies + DM9161_DELAY * HZ);
	}

	static int dm9161_init(struct gfar_mii_info *mii_info)
	{
	struct dm9161_private *priv;

	/* Allocate the private data structure */
	priv = kmalloc(sizeof(struct dm9161_private), GFP_KERNEL);

	if (NULL == priv)
	return -ENOMEM;

	mii_info->priv = priv;

	/* Reset is not done yet */
	priv->resetdone = 0;

	/* Isolate the PHY */
	phy_write(mii_info, MII_BMCR, BMCR_ISOLATE);

	/* Do not bypass the scrambler/descrambler */
	phy_write(mii_info, MII_DM9161_SCR, MII_DM9161_SCR_INIT);

	/* Clear 10BTCSR to default */
	phy_write(mii_info, MII_DM9161_10BTCSR, MII_DM9161_10BTCSR_INIT);

	/* Reconnect the PHY, and enable Autonegotiation */
	phy_write(mii_info, MII_BMCR, BMCR_ANENABLE);

	/* Start a timer for DM9161_DELAY seconds to wait
	* for the PHY to be ready */
	init_timer(&priv->timer);
	priv->timer.function = &dm9161_timer;
	priv->timer.data = (unsigned long) mii_info;
	mod_timer(&priv->timer, jiffies + DM9161_DELAY * HZ);

	return 0;
	}

	static void dm9161_close(struct gfar_mii_info *mii_info)
	{
	struct dm9161_private *priv = mii_info->priv;

	del_timer_sync(&priv->timer);
	kfree(priv);
	}

	#if 0
	static int dm9161_ack_interrupt(struct gfar_mii_info *mii_info)
	{
	phy_read(mii_info, MII_DM9161_INTR);

	return 0;
	}
	#endif

	/* Cicada 820x */
	static struct phy_info phy_info_cis820x = {
	0x000fc440,
	"Cicada Cis8204",
	0x000fffc0,
	.features = MII_GBIT_FEATURES,
	.init = &cis820x_init,
	.config_aneg = &gbit_config_aneg,
	.read_status = &cis820x_read_status,
	.ack_interrupt = &cis820x_ack_interrupt,
	.config_intr = &cis820x_config_intr,
	};

	static struct phy_info phy_info_dm9161 = {
	.phy_id = 0x0181b880,
	.name = "Davicom DM9161E",
	.phy_id_mask = 0x0ffffff0,
	.init = dm9161_init,
	.config_aneg = dm9161_config_aneg,
	.read_status = dm9161_read_status,
	.close = dm9161_close,
	};

	static struct phy_info phy_info_marvell = {
	.phy_id = 0x01410c00,
	.phy_id_mask = 0xffffff00,
	.name = "Marvell 88E1101/88E1111",
	.features = MII_GBIT_FEATURES,
	.config_aneg = &marvell_config_aneg,
	.read_status = &marvell_read_status,
	.ack_interrupt = &marvell_ack_interrupt,
	.config_intr = &marvell_config_intr,
	};

	static struct phy_info phy_info_genmii= {
	.phy_id = 0x00000000,
	.phy_id_mask = 0x00000000,
	.name = "Generic MII",
	.features = MII_BASIC_FEATURES,
	.config_aneg = genmii_config_aneg,
	.read_status = genmii_read_status,
	};

	static struct phy_info *phy_info[] = {
	&phy_info_cis820x,
	&phy_info_marvell,
	&phy_info_dm9161,
	&phy_info_genmii,
	NULL
	};

	u16 phy_read(struct gfar_mii_info *mii_info, u16 regnum)
	{
	u16 retval;
	unsigned long flags;

	spin_lock_irqsave(&mii_info->mdio_lock, flags);
	retval = mii_info->mdio_read(mii_info->dev, mii_info->mii_id, regnum);
	spin_unlock_irqrestore(&mii_info->mdio_lock, flags);

	return retval;
	}

	void phy_write(struct gfar_mii_info *mii_info, u16 regnum, u16 val)
	{
	unsigned long flags;

	spin_lock_irqsave(&mii_info->mdio_lock, flags);
	mii_info->mdio_write(mii_info->dev,
	mii_info->mii_id,
	regnum, val);
	spin_unlock_irqrestore(&mii_info->mdio_lock, flags);
	}

	/* Use the PHY ID registers to determine what type of PHY is attached
	* to device dev. return a struct phy_info structure describing that PHY
	*/
	struct phy_info * get_phy_info(struct gfar_mii_info *mii_info)
	{
	u16 phy_reg;
	u32 phy_ID;
	int i;
	struct phy_info *theInfo = NULL;
	struct net_device *dev = mii_info->dev;

	/* Grab the bits from PHYIR1, and put them in the upper half */
	phy_reg = phy_read(mii_info, MII_PHYSID1);
	phy_ID = (phy_reg & 0xffff) << 16;

	/* Grab the bits from PHYIR2, and put them in the lower half */
	phy_reg = phy_read(mii_info, MII_PHYSID2);
	phy_ID \|= (phy_reg & 0xffff);

	/* loop through all the known PHY types, and find one that */
	/* matches the ID we read from the PHY. */
	for (i = 0; phy_info[i]; i++)
	if (phy_info[i]->phy_id ==
	(phy_ID & phy_info[i]->phy_id_mask)) {
	theInfo = phy_info[i];
	break;
	}

	/* This shouldn't happen, as we have generic PHY support */
	if (theInfo == NULL) {
	printk("%s: PHY id %x is not supported!\n", dev->name, phy_ID);
	return NULL;
	} else {
	printk("%s: PHY is %s (%x)\n", dev->name, theInfo->name,
	phy_ID);
	}

	return theInfo;
	}