drivers/net/fs_enet/fs_enet-mii.c - kernel/msm-4.9 - Gitiles

 /*
  * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
  *
  * Copyright (c) 2003 Intracom S.A.
  *  by Pantelis Antoniou <panto@intracom.gr>
  *
  * 2005 (c) MontaVista Software, Inc.
  * Vitaly Bordug <vbordug@ru.mvista.com>
  *
  * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
  * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
  *
  * This file is licensed under the terms of the GNU General Public License
  * version 2. This program is licensed "as is" without any warranty of any
  * kind, whether express or implied.
  */


 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/string.h>
 #include <linux/ptrace.h>
 #include <linux/errno.h>
 #include <linux/ioport.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/pci.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/mii.h>
 #include <linux/ethtool.h>
 #include <linux/bitops.h>

 #include <asm/pgtable.h>
 #include <asm/irq.h>
 #include <asm/uaccess.h>

 #include "fs_enet.h"

 /*************************************************/

 /*
  * Generic PHY support.
  * Should work for all PHYs, but link change is detected by polling
  */

 static void generic_timer_callback(unsigned long data)
 {
 	struct net_device *dev = (struct net_device *)data;
 	struct fs_enet_private *fep = netdev_priv(dev);

 	fep->phy_timer_list.expires = jiffies + HZ / 2;

 	add_timer(&fep->phy_timer_list);

 	fs_mii_link_status_change_check(dev, 0);
 }

 static void generic_startup(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);

 	fep->phy_timer_list.expires = jiffies + HZ / 2;	/* every 500ms */
 	fep->phy_timer_list.data = (unsigned long)dev;
 	fep->phy_timer_list.function = generic_timer_callback;
 	add_timer(&fep->phy_timer_list);
 }

 static void generic_shutdown(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);

 	del_timer_sync(&fep->phy_timer_list);
 }

 /* ------------------------------------------------------------------------- */
 /* The Davicom DM9161 is used on the NETTA board			     */

 /* register definitions */

 #define MII_DM9161_ANAR		4	/* Aux. Config Register         */
 #define MII_DM9161_ACR		16	/* Aux. Config Register         */
 #define MII_DM9161_ACSR		17	/* Aux. Config/Status Register  */
 #define MII_DM9161_10TCSR	18	/* 10BaseT Config/Status Reg.   */
 #define MII_DM9161_INTR		21	/* Interrupt Register           */
 #define MII_DM9161_RECR		22	/* Receive Error Counter Reg.   */
 #define MII_DM9161_DISCR	23	/* Disconnect Counter Register  */

 static void dm9161_startup(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);

 	fs_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0000);
 	/* Start autonegotiation */
 	fs_mii_write(dev, fep->mii_if.phy_id, MII_BMCR, 0x1200);

 	set_current_state(TASK_UNINTERRUPTIBLE);
 	schedule_timeout(HZ*8);
 }

 static void dm9161_ack_int(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);

 	fs_mii_read(dev, fep->mii_if.phy_id, MII_DM9161_INTR);
 }

 static void dm9161_shutdown(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);

 	fs_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0f00);
 }

 /**********************************************************************************/

 static const struct phy_info phy_info[] = {
 	{
 		.id = 0x00181b88,
 		.name = "DM9161",
 		.startup = dm9161_startup,
 		.ack_int = dm9161_ack_int,
 		.shutdown = dm9161_shutdown,
 	}, {
 		.id = 0,
 		.name = "GENERIC",
 		.startup = generic_startup,
 		.shutdown = generic_shutdown,
 	},
 };

 /**********************************************************************************/

 static int phy_id_detect(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	const struct fs_platform_info *fpi = fep->fpi;
 	struct fs_enet_mii_bus *bus = fep->mii_bus;
 	int i, r, start, end, phytype, physubtype;
 	const struct phy_info *phy;
 	int phy_hwid, phy_id;

 	phy_hwid = -1;
 	fep->phy = NULL;

 	/* auto-detect? */
 	if (fpi->phy_addr == -1) {
 		start = 1;
 		end = 32;
 	} else {		/* direct */
 		start = fpi->phy_addr;
 		end = start + 1;
 	}

 	for (phy_id = start; phy_id < end; phy_id++) {
 		/* skip already used phy addresses on this bus */
 		if (bus->usage_map & (1 << phy_id))
 			continue;
 		r = fs_mii_read(dev, phy_id, MII_PHYSID1);
 		if (r == -1 || (phytype = (r & 0xffff)) == 0xffff)
 			continue;
 		r = fs_mii_read(dev, phy_id, MII_PHYSID2);
 		if (r == -1 || (physubtype = (r & 0xffff)) == 0xffff)
 			continue;
 		phy_hwid = (phytype << 16) | physubtype;
 		if (phy_hwid != -1)
 			break;
 	}

 	if (phy_hwid == -1) {
 		printk(KERN_ERR DRV_MODULE_NAME
 		       ": %s No PHY detected! range=0x%02x-0x%02x\n",
 			dev->name, start, end);
 		return -1;
 	}

 	for (i = 0, phy = phy_info; i < ARRAY_SIZE(phy_info); i++, phy++)
 		if (phy->id == (phy_hwid >> 4) || phy->id == 0)
 			break;

 	if (i >= ARRAY_SIZE(phy_info)) {
 		printk(KERN_ERR DRV_MODULE_NAME
 		       ": %s PHY id 0x%08x is not supported!\n",
 		       dev->name, phy_hwid);
 		return -1;
 	}

 	fep->phy = phy;

 	/* mark this address as used */
 	bus->usage_map |= (1 << phy_id);

 	printk(KERN_INFO DRV_MODULE_NAME
 	       ": %s Phy @ 0x%x, type %s (0x%08x)%s\n",
 	       dev->name, phy_id, fep->phy->name, phy_hwid,
 	       fpi->phy_addr == -1 ? " (auto-detected)" : "");

 	return phy_id;
 }

 void fs_mii_startup(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);

 	if (fep->phy->startup)
 		(*fep->phy->startup) (dev);
 }

 void fs_mii_shutdown(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);

 	if (fep->phy->shutdown)
 		(*fep->phy->shutdown) (dev);
 }

 void fs_mii_ack_int(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);

 	if (fep->phy->ack_int)
 		(*fep->phy->ack_int) (dev);
 }

 #define MII_LINK	0x0001
 #define MII_HALF	0x0002
 #define MII_FULL	0x0004
 #define MII_BASE4	0x0008
 #define MII_10M		0x0010
 #define MII_100M	0x0020
 #define MII_1G		0x0040
 #define MII_10G		0x0080

 /* return full mii info at one gulp, with a usable form */
 static unsigned int mii_full_status(struct mii_if_info *mii)
 {
 	unsigned int status;
 	int bmsr, adv, lpa, neg;
 	struct fs_enet_private* fep = netdev_priv(mii->dev);

 	/* first, a dummy read, needed to latch some MII phys */
 	(void)mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);
 	bmsr = mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);

 	/* no link */
 	if ((bmsr & BMSR_LSTATUS) == 0)
 		return 0;

 	status = MII_LINK;

 	/* Lets look what ANEG says if it's supported - otherwize we shall
 	   take the right values from the platform info*/
 	if(!mii->force_media) {
 		/* autoneg not completed; don't bother */
 		if ((bmsr & BMSR_ANEGCOMPLETE) == 0)
 			return 0;

 		adv = (*mii->mdio_read)(mii->dev, mii->phy_id, MII_ADVERTISE);
 		lpa = (*mii->mdio_read)(mii->dev, mii->phy_id, MII_LPA);

 		neg = lpa & adv;
 	} else {
 		neg = fep->fpi->bus_info->lpa;
 	}

 	if (neg & LPA_100FULL)
 		status |= MII_FULL | MII_100M;
 	else if (neg & LPA_100BASE4)
 		status |= MII_FULL | MII_BASE4 | MII_100M;
 	else if (neg & LPA_100HALF)
 		status |= MII_HALF | MII_100M;
 	else if (neg & LPA_10FULL)
 		status |= MII_FULL | MII_10M;
 	else
 		status |= MII_HALF | MII_10M;

 	return status;
 }

 void fs_mii_link_status_change_check(struct net_device *dev, int init_media)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	struct mii_if_info *mii = &fep->mii_if;
 	unsigned int mii_status;
 	int ok_to_print, link, duplex, speed;
 	unsigned long flags;

 	ok_to_print = netif_msg_link(fep);

 	mii_status = mii_full_status(mii);

 	if (!init_media && mii_status == fep->last_mii_status)
 		return;

 	fep->last_mii_status = mii_status;

 	link = !!(mii_status & MII_LINK);
 	duplex = !!(mii_status & MII_FULL);
 	speed = (mii_status & MII_100M) ? 100 : 10;

 	if (link == 0) {
 		netif_carrier_off(mii->dev);
 		netif_stop_queue(dev);
 		if (!init_media) {
 			spin_lock_irqsave(&fep->lock, flags);
 			(*fep->ops->stop)(dev);
 			spin_unlock_irqrestore(&fep->lock, flags);
 		}

 		if (ok_to_print)
 			printk(KERN_INFO "%s: link down\n", mii->dev->name);

 	} else {

 		mii->full_duplex = duplex;

 		netif_carrier_on(mii->dev);

 		spin_lock_irqsave(&fep->lock, flags);
 		fep->duplex = duplex;
 		fep->speed = speed;
 		(*fep->ops->restart)(dev);
 		spin_unlock_irqrestore(&fep->lock, flags);

 		netif_start_queue(dev);

 		if (ok_to_print)
 			printk(KERN_INFO "%s: link up, %dMbps, %s-duplex\n",
 			       dev->name, speed, duplex ? "full" : "half");
 	}
 }

 /**********************************************************************************/

 int fs_mii_read(struct net_device *dev, int phy_id, int location)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	struct fs_enet_mii_bus *bus = fep->mii_bus;

 	unsigned long flags;
 	int ret;

 	spin_lock_irqsave(&bus->mii_lock, flags);
 	ret = (*bus->mii_read)(bus, phy_id, location);
 	spin_unlock_irqrestore(&bus->mii_lock, flags);

 	return ret;
 }

 void fs_mii_write(struct net_device *dev, int phy_id, int location, int value)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	struct fs_enet_mii_bus *bus = fep->mii_bus;
 	unsigned long flags;

 	spin_lock_irqsave(&bus->mii_lock, flags);
 	(*bus->mii_write)(bus, phy_id, location, value);
 	spin_unlock_irqrestore(&bus->mii_lock, flags);
 }

 /*****************************************************************************/

 /* list of all registered mii buses */
 static LIST_HEAD(fs_mii_bus_list);

 static struct fs_enet_mii_bus *lookup_bus(int method, int id)
 {
 	struct list_head *ptr;
 	struct fs_enet_mii_bus *bus;

 	list_for_each(ptr, &fs_mii_bus_list) {
 		bus = list_entry(ptr, struct fs_enet_mii_bus, list);
 		if (bus->bus_info->method == method &&
 			bus->bus_info->id == id)
 			return bus;
 	}
 	return NULL;
 }

 static struct fs_enet_mii_bus *create_bus(const struct fs_mii_bus_info *bi)
 {
 	struct fs_enet_mii_bus *bus;
 	int ret = 0;

 	bus = kmalloc(sizeof(*bus), GFP_KERNEL);
 	if (bus == NULL) {
 		ret = -ENOMEM;
 		goto err;
 	}
 	memset(bus, 0, sizeof(*bus));
 	spin_lock_init(&bus->mii_lock);
 	bus->bus_info = bi;
 	bus->refs = 0;
 	bus->usage_map = 0;

 	/* perform initialization */
 	switch (bi->method) {

 		case fsmii_fixed:
 			ret = fs_mii_fixed_init(bus);
 			if (ret != 0)
 				goto err;
 			break;

 		case fsmii_bitbang:
 			ret = fs_mii_bitbang_init(bus);
 			if (ret != 0)
 				goto err;
 			break;
 #ifdef CONFIG_FS_ENET_HAS_FEC
 		case fsmii_fec:
 			ret = fs_mii_fec_init(bus);
 			if (ret != 0)
 				goto err;
 			break;
 #endif
 		default:
 			ret = -EINVAL;
 			goto err;
 	}

 	list_add(&bus->list, &fs_mii_bus_list);

 	return bus;

 err:
 	kfree(bus);
 	return ERR_PTR(ret);
 }

 static void destroy_bus(struct fs_enet_mii_bus *bus)
 {
 	/* remove from bus list */
 	list_del(&bus->list);

 	/* nothing more needed */
 	kfree(bus);
 }

 int fs_mii_connect(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	const struct fs_platform_info *fpi = fep->fpi;
 	struct fs_enet_mii_bus *bus = NULL;

 	/* check method validity */
 	switch (fpi->bus_info->method) {
 		case fsmii_fixed:
 		case fsmii_bitbang:
 			break;
 #ifdef CONFIG_FS_ENET_HAS_FEC
 		case fsmii_fec:
 			break;
 #endif
 		default:
 			printk(KERN_ERR DRV_MODULE_NAME
 			       ": %s Unknown MII bus method (%d)!\n",
 			       dev->name, fpi->bus_info->method);
 			return -EINVAL;
 	}

 	bus = lookup_bus(fpi->bus_info->method, fpi->bus_info->id);

 	/* if not found create new bus */
 	if (bus == NULL) {
 		bus = create_bus(fpi->bus_info);
 		if (IS_ERR(bus)) {
 			printk(KERN_ERR DRV_MODULE_NAME
 			       ": %s MII bus creation failure!\n", dev->name);
 			return PTR_ERR(bus);
 		}
 	}

 	bus->refs++;

 	fep->mii_bus = bus;

 	fep->mii_if.dev = dev;
 	fep->mii_if.phy_id_mask = 0x1f;
 	fep->mii_if.reg_num_mask = 0x1f;
 	fep->mii_if.mdio_read = fs_mii_read;
 	fep->mii_if.mdio_write = fs_mii_write;
 	fep->mii_if.force_media = fpi->bus_info->disable_aneg;
 	fep->mii_if.phy_id = phy_id_detect(dev);

 	return 0;
 }

 void fs_mii_disconnect(struct net_device *dev)
 {
 	struct fs_enet_private *fep = netdev_priv(dev);
 	struct fs_enet_mii_bus *bus = NULL;

 	bus = fep->mii_bus;
 	fep->mii_bus = NULL;

 	if (--bus->refs <= 0)
 		destroy_bus(bus);
 }
	/*
	* Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
	*
	* Copyright (c) 2003 Intracom S.A.
	* by Pantelis Antoniou <panto@intracom.gr>
	*
	* 2005 (c) MontaVista Software, Inc.
	* Vitaly Bordug <vbordug@ru.mvista.com>
	*
	* Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
	* and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
	*
	* This file is licensed under the terms of the GNU General Public License
	* version 2. This program is licensed "as is" without any warranty of any
	* kind, whether express or implied.
	*/


	#include <linux/config.h>
	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/sched.h>
	#include <linux/string.h>
	#include <linux/ptrace.h>
	#include <linux/errno.h>
	#include <linux/ioport.h>
	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/pci.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/mii.h>
	#include <linux/ethtool.h>
	#include <linux/bitops.h>

	#include <asm/pgtable.h>
	#include <asm/irq.h>
	#include <asm/uaccess.h>

	#include "fs_enet.h"

	/*************************************************/

	/*
	* Generic PHY support.
	* Should work for all PHYs, but link change is detected by polling
	*/

	static void generic_timer_callback(unsigned long data)
	{
	struct net_device dev = (struct net_device )data;
	struct fs_enet_private *fep = netdev_priv(dev);

	fep->phy_timer_list.expires = jiffies + HZ / 2;

	add_timer(&fep->phy_timer_list);

	fs_mii_link_status_change_check(dev, 0);
	}

	static void generic_startup(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);

	fep->phy_timer_list.expires = jiffies + HZ / 2; /* every 500ms */
	fep->phy_timer_list.data = (unsigned long)dev;
	fep->phy_timer_list.function = generic_timer_callback;
	add_timer(&fep->phy_timer_list);
	}

	static void generic_shutdown(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);

	del_timer_sync(&fep->phy_timer_list);
	}

	/* ------------------------------------------------------------------------- */
	/* The Davicom DM9161 is used on the NETTA board */

	/* register definitions */

	#define MII_DM9161_ANAR 4 /* Aux. Config Register */
	#define MII_DM9161_ACR 16 /* Aux. Config Register */
	#define MII_DM9161_ACSR 17 /* Aux. Config/Status Register */
	#define MII_DM9161_10TCSR 18 /* 10BaseT Config/Status Reg. */
	#define MII_DM9161_INTR 21 /* Interrupt Register */
	#define MII_DM9161_RECR 22 /* Receive Error Counter Reg. */
	#define MII_DM9161_DISCR 23 /* Disconnect Counter Register */

	static void dm9161_startup(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);

	fs_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0000);
	/* Start autonegotiation */
	fs_mii_write(dev, fep->mii_if.phy_id, MII_BMCR, 0x1200);

	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(HZ*8);
	}

	static void dm9161_ack_int(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);

	fs_mii_read(dev, fep->mii_if.phy_id, MII_DM9161_INTR);
	}

	static void dm9161_shutdown(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);

	fs_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0f00);
	}

	/**********************************************************************************/

	static const struct phy_info phy_info[] = {
	{
	.id = 0x00181b88,
	.name = "DM9161",
	.startup = dm9161_startup,
	.ack_int = dm9161_ack_int,
	.shutdown = dm9161_shutdown,
	}, {
	.id = 0,
	.name = "GENERIC",
	.startup = generic_startup,
	.shutdown = generic_shutdown,
	},
	};

	/**********************************************************************************/

	static int phy_id_detect(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);
	const struct fs_platform_info *fpi = fep->fpi;
	struct fs_enet_mii_bus *bus = fep->mii_bus;
	int i, r, start, end, phytype, physubtype;
	const struct phy_info *phy;
	int phy_hwid, phy_id;

	phy_hwid = -1;
	fep->phy = NULL;

	/* auto-detect? */
	if (fpi->phy_addr == -1) {
	start = 1;
	end = 32;
	} else { /* direct */
	start = fpi->phy_addr;
	end = start + 1;
	}

	for (phy_id = start; phy_id < end; phy_id++) {
	/* skip already used phy addresses on this bus */
	if (bus->usage_map & (1 << phy_id))
	continue;
	r = fs_mii_read(dev, phy_id, MII_PHYSID1);
	if (r == -1 \|\| (phytype = (r & 0xffff)) == 0xffff)
	continue;
	r = fs_mii_read(dev, phy_id, MII_PHYSID2);
	if (r == -1 \|\| (physubtype = (r & 0xffff)) == 0xffff)
	continue;
	phy_hwid = (phytype << 16) \| physubtype;
	if (phy_hwid != -1)
	break;
	}

	if (phy_hwid == -1) {
	printk(KERN_ERR DRV_MODULE_NAME
	": %s No PHY detected! range=0x%02x-0x%02x\n",
	dev->name, start, end);
	return -1;
	}

	for (i = 0, phy = phy_info; i < ARRAY_SIZE(phy_info); i++, phy++)
	if (phy->id == (phy_hwid >> 4) \|\| phy->id == 0)
	break;

	if (i >= ARRAY_SIZE(phy_info)) {
	printk(KERN_ERR DRV_MODULE_NAME
	": %s PHY id 0x%08x is not supported!\n",
	dev->name, phy_hwid);
	return -1;
	}

	fep->phy = phy;

	/* mark this address as used */
	bus->usage_map \|= (1 << phy_id);

	printk(KERN_INFO DRV_MODULE_NAME
	": %s Phy @ 0x%x, type %s (0x%08x)%s\n",
	dev->name, phy_id, fep->phy->name, phy_hwid,
	fpi->phy_addr == -1 ? " (auto-detected)" : "");

	return phy_id;
	}

	void fs_mii_startup(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (fep->phy->startup)
	(*fep->phy->startup) (dev);
	}

	void fs_mii_shutdown(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (fep->phy->shutdown)
	(*fep->phy->shutdown) (dev);
	}

	void fs_mii_ack_int(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (fep->phy->ack_int)
	(*fep->phy->ack_int) (dev);
	}

	#define MII_LINK 0x0001
	#define MII_HALF 0x0002
	#define MII_FULL 0x0004
	#define MII_BASE4 0x0008
	#define MII_10M 0x0010
	#define MII_100M 0x0020
	#define MII_1G 0x0040
	#define MII_10G 0x0080

	/* return full mii info at one gulp, with a usable form */
	static unsigned int mii_full_status(struct mii_if_info *mii)
	{
	unsigned int status;
	int bmsr, adv, lpa, neg;
	struct fs_enet_private* fep = netdev_priv(mii->dev);

	/* first, a dummy read, needed to latch some MII phys */
	(void)mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);
	bmsr = mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);

	/* no link */
	if ((bmsr & BMSR_LSTATUS) == 0)
	return 0;

	status = MII_LINK;

	/* Lets look what ANEG says if it's supported - otherwize we shall
	take the right values from the platform info*/
	if(!mii->force_media) {
	/* autoneg not completed; don't bother */
	if ((bmsr & BMSR_ANEGCOMPLETE) == 0)
	return 0;

	adv = (*mii->mdio_read)(mii->dev, mii->phy_id, MII_ADVERTISE);
	lpa = (*mii->mdio_read)(mii->dev, mii->phy_id, MII_LPA);

	neg = lpa & adv;
	} else {
	neg = fep->fpi->bus_info->lpa;
	}

	if (neg & LPA_100FULL)
	status \|= MII_FULL \| MII_100M;
	else if (neg & LPA_100BASE4)
	status \|= MII_FULL \| MII_BASE4 \| MII_100M;
	else if (neg & LPA_100HALF)
	status \|= MII_HALF \| MII_100M;
	else if (neg & LPA_10FULL)
	status \|= MII_FULL \| MII_10M;
	else
	status \|= MII_HALF \| MII_10M;

	return status;
	}

	void fs_mii_link_status_change_check(struct net_device *dev, int init_media)
	{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct mii_if_info *mii = &fep->mii_if;
	unsigned int mii_status;
	int ok_to_print, link, duplex, speed;
	unsigned long flags;

	ok_to_print = netif_msg_link(fep);

	mii_status = mii_full_status(mii);

	if (!init_media && mii_status == fep->last_mii_status)
	return;

	fep->last_mii_status = mii_status;

	link = !!(mii_status & MII_LINK);
	duplex = !!(mii_status & MII_FULL);
	speed = (mii_status & MII_100M) ? 100 : 10;

	if (link == 0) {
	netif_carrier_off(mii->dev);
	netif_stop_queue(dev);
	if (!init_media) {
	spin_lock_irqsave(&fep->lock, flags);
	(*fep->ops->stop)(dev);
	spin_unlock_irqrestore(&fep->lock, flags);
	}

	if (ok_to_print)
	printk(KERN_INFO "%s: link down\n", mii->dev->name);

	} else {

	mii->full_duplex = duplex;

	netif_carrier_on(mii->dev);

	spin_lock_irqsave(&fep->lock, flags);
	fep->duplex = duplex;
	fep->speed = speed;
	(*fep->ops->restart)(dev);
	spin_unlock_irqrestore(&fep->lock, flags);

	netif_start_queue(dev);

	if (ok_to_print)
	printk(KERN_INFO "%s: link up, %dMbps, %s-duplex\n",
	dev->name, speed, duplex ? "full" : "half");
	}
	}

	/**********************************************************************************/

	int fs_mii_read(struct net_device *dev, int phy_id, int location)
	{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct fs_enet_mii_bus *bus = fep->mii_bus;

	unsigned long flags;
	int ret;

	spin_lock_irqsave(&bus->mii_lock, flags);
	ret = (*bus->mii_read)(bus, phy_id, location);
	spin_unlock_irqrestore(&bus->mii_lock, flags);

	return ret;
	}

	void fs_mii_write(struct net_device *dev, int phy_id, int location, int value)
	{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct fs_enet_mii_bus *bus = fep->mii_bus;
	unsigned long flags;

	spin_lock_irqsave(&bus->mii_lock, flags);
	(*bus->mii_write)(bus, phy_id, location, value);
	spin_unlock_irqrestore(&bus->mii_lock, flags);
	}

	/*****************************************************************************/

	/* list of all registered mii buses */
	static LIST_HEAD(fs_mii_bus_list);

	static struct fs_enet_mii_bus *lookup_bus(int method, int id)
	{
	struct list_head *ptr;
	struct fs_enet_mii_bus *bus;

	list_for_each(ptr, &fs_mii_bus_list) {
	bus = list_entry(ptr, struct fs_enet_mii_bus, list);
	if (bus->bus_info->method == method &&
	bus->bus_info->id == id)
	return bus;
	}
	return NULL;
	}

	static struct fs_enet_mii_bus create_bus(const struct fs_mii_bus_info bi)
	{
	struct fs_enet_mii_bus *bus;
	int ret = 0;

	bus = kmalloc(sizeof(*bus), GFP_KERNEL);
	if (bus == NULL) {
	ret = -ENOMEM;
	goto err;
	}
	memset(bus, 0, sizeof(*bus));
	spin_lock_init(&bus->mii_lock);
	bus->bus_info = bi;
	bus->refs = 0;
	bus->usage_map = 0;

	/* perform initialization */
	switch (bi->method) {

	case fsmii_fixed:
	ret = fs_mii_fixed_init(bus);
	if (ret != 0)
	goto err;
	break;

	case fsmii_bitbang:
	ret = fs_mii_bitbang_init(bus);
	if (ret != 0)
	goto err;
	break;
	#ifdef CONFIG_FS_ENET_HAS_FEC
	case fsmii_fec:
	ret = fs_mii_fec_init(bus);
	if (ret != 0)
	goto err;
	break;
	#endif
	default:
	ret = -EINVAL;
	goto err;
	}

	list_add(&bus->list, &fs_mii_bus_list);

	return bus;

	err:
	kfree(bus);
	return ERR_PTR(ret);
	}

	static void destroy_bus(struct fs_enet_mii_bus *bus)
	{
	/* remove from bus list */
	list_del(&bus->list);

	/* nothing more needed */
	kfree(bus);
	}

	int fs_mii_connect(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);
	const struct fs_platform_info *fpi = fep->fpi;
	struct fs_enet_mii_bus *bus = NULL;

	/* check method validity */
	switch (fpi->bus_info->method) {
	case fsmii_fixed:
	case fsmii_bitbang:
	break;
	#ifdef CONFIG_FS_ENET_HAS_FEC
	case fsmii_fec:
	break;
	#endif
	default:
	printk(KERN_ERR DRV_MODULE_NAME
	": %s Unknown MII bus method (%d)!\n",
	dev->name, fpi->bus_info->method);
	return -EINVAL;
	}

	bus = lookup_bus(fpi->bus_info->method, fpi->bus_info->id);

	/* if not found create new bus */
	if (bus == NULL) {
	bus = create_bus(fpi->bus_info);
	if (IS_ERR(bus)) {
	printk(KERN_ERR DRV_MODULE_NAME
	": %s MII bus creation failure!\n", dev->name);
	return PTR_ERR(bus);
	}
	}

	bus->refs++;

	fep->mii_bus = bus;

	fep->mii_if.dev = dev;
	fep->mii_if.phy_id_mask = 0x1f;
	fep->mii_if.reg_num_mask = 0x1f;
	fep->mii_if.mdio_read = fs_mii_read;
	fep->mii_if.mdio_write = fs_mii_write;
	fep->mii_if.force_media = fpi->bus_info->disable_aneg;
	fep->mii_if.phy_id = phy_id_detect(dev);

	return 0;
	}

	void fs_mii_disconnect(struct net_device *dev)
	{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct fs_enet_mii_bus *bus = NULL;

	bus = fep->mii_bus;
	fep->mii_bus = NULL;

	if (--bus->refs <= 0)
	destroy_bus(bus);
	}