drivers/net/fsl_pq_mdio.c - arm/linux - Git at Google

 /*
  * Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation
  * Provides Bus interface for MIIM regs
  *
  * Author: Andy Fleming <afleming@freescale.com>
  * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
  *
  * Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc.
  *
  * Based on gianfar_mii.c and ucc_geth_mii.c (Li Yang, Kim Phillips)
  *
  * 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/kernel.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/unistd.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 <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/crc32.h>
 #include <linux/mii.h>
 #include <linux/phy.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_mdio.h>
 #include <linux/of_platform.h>

 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/uaccess.h>
 #include <asm/ucc.h>

 #include "gianfar.h"
 #include "fsl_pq_mdio.h"

 struct fsl_pq_mdio_priv {
 	void __iomem *map;
 	struct fsl_pq_mdio __iomem *regs;
 };

 /*
  * Write value to the PHY at mii_id at register regnum,
  * on the bus attached to the local interface, which may be different from the
  * generic mdio bus (tied to a single interface), waiting until the write is
  * done before returning. This is helpful in programming interfaces like
  * the TBI which control interfaces like onchip SERDES and are always tied to
  * the local mdio pins, which may not be the same as system mdio bus, used for
  * controlling the external PHYs, for example.
  */
 int fsl_pq_local_mdio_write(struct fsl_pq_mdio __iomem *regs, int mii_id,
 		int regnum, u16 value)
 {
 	/* Set the PHY address and the register address we want to write */
 	out_be32(&regs->miimadd, (mii_id << 8) | regnum);

 	/* Write out the value we want */
 	out_be32(&regs->miimcon, value);

 	/* Wait for the transaction to finish */
 	while (in_be32(&regs->miimind) & MIIMIND_BUSY)
 		cpu_relax();

 	return 0;
 }

 /*
  * Read the bus for PHY at addr mii_id, register regnum, and
  * return the value.  Clears miimcom first.  All PHY operation
  * done on the bus attached to the local interface,
  * which may be different from the generic mdio bus
  * This is helpful in programming interfaces like
  * the TBI which, in turn, control interfaces like onchip SERDES
  * and are always tied to the local mdio pins, which may not be the
  * same as system mdio bus, used for controlling the external PHYs, for eg.
  */
 int fsl_pq_local_mdio_read(struct fsl_pq_mdio __iomem *regs,
 		int mii_id, int regnum)
 {
 	u16 value;

 	/* Set the PHY address and the register address we want to read */
 	out_be32(&regs->miimadd, (mii_id << 8) | regnum);

 	/* Clear miimcom, and then initiate a read */
 	out_be32(&regs->miimcom, 0);
 	out_be32(&regs->miimcom, MII_READ_COMMAND);

 	/* Wait for the transaction to finish */
 	while (in_be32(&regs->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
 		cpu_relax();

 	/* Grab the value of the register from miimstat */
 	value = in_be32(&regs->miimstat);

 	return value;
 }

 static struct fsl_pq_mdio __iomem *fsl_pq_mdio_get_regs(struct mii_bus *bus)
 {
 	struct fsl_pq_mdio_priv *priv = bus->priv;

 	return priv->regs;
 }

 /*
  * Write value to the PHY at mii_id at register regnum,
  * on the bus, waiting until the write is done before returning.
  */
 int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
 {
 	struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);

 	/* Write to the local MII regs */
 	return(fsl_pq_local_mdio_write(regs, mii_id, regnum, value));
 }

 /*
  * Read the bus for PHY at addr mii_id, register regnum, and
  * return the value.  Clears miimcom first.
  */
 int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
 {
 	struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);

 	/* Read the local MII regs */
 	return(fsl_pq_local_mdio_read(regs, mii_id, regnum));
 }

 /* Reset the MIIM registers, and wait for the bus to free */
 static int fsl_pq_mdio_reset(struct mii_bus *bus)
 {
 	struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
 	int timeout = PHY_INIT_TIMEOUT;

 	mutex_lock(&bus->mdio_lock);

 	/* Reset the management interface */
 	out_be32(&regs->miimcfg, MIIMCFG_RESET);

 	/* Setup the MII Mgmt clock speed */
 	out_be32(&regs->miimcfg, MIIMCFG_INIT_VALUE);

 	/* Wait until the bus is free */
 	while ((in_be32(&regs->miimind) & MIIMIND_BUSY) && timeout--)
 		cpu_relax();

 	mutex_unlock(&bus->mdio_lock);

 	if (timeout < 0) {
 		printk(KERN_ERR "%s: The MII Bus is stuck!\n",
 				bus->name);
 		return -EBUSY;
 	}

 	return 0;
 }

 void fsl_pq_mdio_bus_name(char *name, struct device_node *np)
 {
 	const u32 *addr;
 	u64 taddr = OF_BAD_ADDR;

 	addr = of_get_address(np, 0, NULL, NULL);
 	if (addr)
 		taddr = of_translate_address(np, addr);

 	snprintf(name, MII_BUS_ID_SIZE, "%s@%llx", np->name,
 		(unsigned long long)taddr);
 }
 EXPORT_SYMBOL_GPL(fsl_pq_mdio_bus_name);

 /* Scan the bus in reverse, looking for an empty spot */
 static int fsl_pq_mdio_find_free(struct mii_bus *new_bus)
 {
 	int i;

 	for (i = PHY_MAX_ADDR; i > 0; i--) {
 		u32 phy_id;

 		if (get_phy_id(new_bus, i, &phy_id))
 			return -1;

 		if (phy_id == 0xffffffff)
 			break;
 	}

 	return i;
 }


 #if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE)
 static u32 __iomem *get_gfar_tbipa(struct fsl_pq_mdio __iomem *regs, struct device_node *np)
 {
 	struct gfar __iomem *enet_regs;

 	/*
 	 * This is mildly evil, but so is our hardware for doing this.
 	 * Also, we have to cast back to struct gfar because of
 	 * definition weirdness done in gianfar.h.
 	 */
 	if(of_device_is_compatible(np, "fsl,gianfar-mdio") ||
 		of_device_is_compatible(np, "fsl,gianfar-tbi") ||
 		of_device_is_compatible(np, "gianfar")) {
 		enet_regs = (struct gfar __iomem *)regs;
 		return &enet_regs->tbipa;
 	} else if (of_device_is_compatible(np, "fsl,etsec2-mdio") ||
 			of_device_is_compatible(np, "fsl,etsec2-tbi")) {
 		return of_iomap(np, 1);
 	} else
 		return NULL;
 }
 #endif


 #if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE)
 static int get_ucc_id_for_range(u64 start, u64 end, u32 *ucc_id)
 {
 	struct device_node *np = NULL;
 	int err = 0;

 	for_each_compatible_node(np, NULL, "ucc_geth") {
 		struct resource tempres;

 		err = of_address_to_resource(np, 0, &tempres);
 		if (err)
 			continue;

 		/* if our mdio regs fall within this UCC regs range */
 		if ((start >= tempres.start) && (end <= tempres.end)) {
 			/* Find the id of the UCC */
 			const u32 *id;

 			id = of_get_property(np, "cell-index", NULL);
 			if (!id) {
 				id = of_get_property(np, "device-id", NULL);
 				if (!id)
 					continue;
 			}

 			*ucc_id = *id;

 			return 0;
 		}
 	}

 	if (err)
 		return err;
 	else
 		return -EINVAL;
 }
 #endif


 static int fsl_pq_mdio_probe(struct of_device *ofdev,
 		const struct of_device_id *match)
 {
 	struct device_node *np = ofdev->dev.of_node;
 	struct device_node *tbi;
 	struct fsl_pq_mdio_priv *priv;
 	struct fsl_pq_mdio __iomem *regs = NULL;
 	void __iomem *map;
 	u32 __iomem *tbipa;
 	struct mii_bus *new_bus;
 	int tbiaddr = -1;
 	const u32 *addrp;
 	u64 addr = 0, size = 0;
 	int err;

 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	new_bus = mdiobus_alloc();
 	if (!new_bus) {
 		err = -ENOMEM;
 		goto err_free_priv;
 	}

 	new_bus->name = "Freescale PowerQUICC MII Bus",
 	new_bus->read = &fsl_pq_mdio_read,
 	new_bus->write = &fsl_pq_mdio_write,
 	new_bus->reset = &fsl_pq_mdio_reset,
 	new_bus->priv = priv;
 	fsl_pq_mdio_bus_name(new_bus->id, np);

 	addrp = of_get_address(np, 0, &size, NULL);
 	if (!addrp) {
 		err = -EINVAL;
 		goto err_free_bus;
 	}

 	/* Set the PHY base address */
 	addr = of_translate_address(np, addrp);
 	if (addr == OF_BAD_ADDR) {
 		err = -EINVAL;
 		goto err_free_bus;
 	}

 	map = ioremap(addr, size);
 	if (!map) {
 		err = -ENOMEM;
 		goto err_free_bus;
 	}
 	priv->map = map;

 	if (of_device_is_compatible(np, "fsl,gianfar-mdio") ||
 			of_device_is_compatible(np, "fsl,gianfar-tbi") ||
 			of_device_is_compatible(np, "fsl,ucc-mdio") ||
 			of_device_is_compatible(np, "ucc_geth_phy"))
 		map -= offsetof(struct fsl_pq_mdio, miimcfg);
 	regs = map;
 	priv->regs = regs;

 	new_bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);

 	if (NULL == new_bus->irq) {
 		err = -ENOMEM;
 		goto err_unmap_regs;
 	}

 	new_bus->parent = &ofdev->dev;
 	dev_set_drvdata(&ofdev->dev, new_bus);

 	if (of_device_is_compatible(np, "fsl,gianfar-mdio") ||
 			of_device_is_compatible(np, "fsl,gianfar-tbi") ||
 			of_device_is_compatible(np, "fsl,etsec2-mdio") ||
 			of_device_is_compatible(np, "fsl,etsec2-tbi") ||
 			of_device_is_compatible(np, "gianfar")) {
 #if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE)
 		tbipa = get_gfar_tbipa(regs, np);
 		if (!tbipa) {
 			err = -EINVAL;
 			goto err_free_irqs;
 		}
 #else
 		err = -ENODEV;
 		goto err_free_irqs;
 #endif
 	} else if (of_device_is_compatible(np, "fsl,ucc-mdio") ||
 			of_device_is_compatible(np, "ucc_geth_phy")) {
 #if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE)
 		u32 id;
 		static u32 mii_mng_master;

 		tbipa = &regs->utbipar;

 		if ((err = get_ucc_id_for_range(addr, addr + size, &id)))
 			goto err_free_irqs;

 		if (!mii_mng_master) {
 			mii_mng_master = id;
 			ucc_set_qe_mux_mii_mng(id - 1);
 		}
 #else
 		err = -ENODEV;
 		goto err_free_irqs;
 #endif
 	} else {
 		err = -ENODEV;
 		goto err_free_irqs;
 	}

 	for_each_child_of_node(np, tbi) {
 		if (!strncmp(tbi->type, "tbi-phy", 8))
 			break;
 	}

 	if (tbi) {
 		const u32 *prop = of_get_property(tbi, "reg", NULL);

 		if (prop)
 			tbiaddr = *prop;
 	}

 	if (tbiaddr == -1) {
 		out_be32(tbipa, 0);

 		tbiaddr = fsl_pq_mdio_find_free(new_bus);
 	}

 	/*
 	 * We define TBIPA at 0 to be illegal, opting to fail for boards that
 	 * have PHYs at 1-31, rather than change tbipa and rescan.
 	 */
 	if (tbiaddr == 0) {
 		err = -EBUSY;

 		goto err_free_irqs;
 	}

 	out_be32(tbipa, tbiaddr);

 	err = of_mdiobus_register(new_bus, np);
 	if (err) {
 		printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
 				new_bus->name);
 		goto err_free_irqs;
 	}

 	return 0;

 err_free_irqs:
 	kfree(new_bus->irq);
 err_unmap_regs:
 	iounmap(priv->map);
 err_free_bus:
 	kfree(new_bus);
 err_free_priv:
 	kfree(priv);
 	return err;
 }


 static int fsl_pq_mdio_remove(struct of_device *ofdev)
 {
 	struct device *device = &ofdev->dev;
 	struct mii_bus *bus = dev_get_drvdata(device);
 	struct fsl_pq_mdio_priv *priv = bus->priv;

 	mdiobus_unregister(bus);

 	dev_set_drvdata(device, NULL);

 	iounmap(priv->map);
 	bus->priv = NULL;
 	mdiobus_free(bus);
 	kfree(priv);

 	return 0;
 }

 static struct of_device_id fsl_pq_mdio_match[] = {
 	{
 		.type = "mdio",
 		.compatible = "ucc_geth_phy",
 	},
 	{
 		.type = "mdio",
 		.compatible = "gianfar",
 	},
 	{
 		.compatible = "fsl,ucc-mdio",
 	},
 	{
 		.compatible = "fsl,gianfar-tbi",
 	},
 	{
 		.compatible = "fsl,gianfar-mdio",
 	},
 	{
 		.compatible = "fsl,etsec2-tbi",
 	},
 	{
 		.compatible = "fsl,etsec2-mdio",
 	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match);

 static struct of_platform_driver fsl_pq_mdio_driver = {
 	.driver = {
 		.name = "fsl-pq_mdio",
 		.owner = THIS_MODULE,
 		.of_match_table = fsl_pq_mdio_match,
 	},
 	.probe = fsl_pq_mdio_probe,
 	.remove = fsl_pq_mdio_remove,
 };

 int __init fsl_pq_mdio_init(void)
 {
 	return of_register_platform_driver(&fsl_pq_mdio_driver);
 }
 module_init(fsl_pq_mdio_init);

 void fsl_pq_mdio_exit(void)
 {
 	of_unregister_platform_driver(&fsl_pq_mdio_driver);
 }
 module_exit(fsl_pq_mdio_exit);
 MODULE_LICENSE("GPL");
	/*
	* Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation
	* Provides Bus interface for MIIM regs
	*
	* Author: Andy Fleming <afleming@freescale.com>
	* Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
	*
	* Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc.
	*
	* Based on gianfar_mii.c and ucc_geth_mii.c (Li Yang, Kim Phillips)
	*
	* 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/kernel.h>
	#include <linux/string.h>
	#include <linux/errno.h>
	#include <linux/unistd.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 <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/crc32.h>
	#include <linux/mii.h>
	#include <linux/phy.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_mdio.h>
	#include <linux/of_platform.h>

	#include <asm/io.h>
	#include <asm/irq.h>
	#include <asm/uaccess.h>
	#include <asm/ucc.h>

	#include "gianfar.h"
	#include "fsl_pq_mdio.h"

	struct fsl_pq_mdio_priv {
	void __iomem *map;
	struct fsl_pq_mdio __iomem *regs;
	};

	/*
	* Write value to the PHY at mii_id at register regnum,
	* on the bus attached to the local interface, which may be different from the
	* generic mdio bus (tied to a single interface), waiting until the write is
	* done before returning. This is helpful in programming interfaces like
	* the TBI which control interfaces like onchip SERDES and are always tied to
	* the local mdio pins, which may not be the same as system mdio bus, used for
	* controlling the external PHYs, for example.
	*/
	int fsl_pq_local_mdio_write(struct fsl_pq_mdio __iomem *regs, int mii_id,
	int regnum, u16 value)
	{
	/* Set the PHY address and the register address we want to write */
	out_be32(&regs->miimadd, (mii_id << 8) \| regnum);

	/* Write out the value we want */
	out_be32(&regs->miimcon, value);

	/* Wait for the transaction to finish */
	while (in_be32(&regs->miimind) & MIIMIND_BUSY)
	cpu_relax();

	return 0;
	}

	/*
	* Read the bus for PHY at addr mii_id, register regnum, and
	* return the value. Clears miimcom first. All PHY operation
	* done on the bus attached to the local interface,
	* which may be different from the generic mdio bus
	* This is helpful in programming interfaces like
	* the TBI which, in turn, control interfaces like onchip SERDES
	* and are always tied to the local mdio pins, which may not be the
	* same as system mdio bus, used for controlling the external PHYs, for eg.
	*/
	int fsl_pq_local_mdio_read(struct fsl_pq_mdio __iomem *regs,
	int mii_id, int regnum)
	{
	u16 value;

	/* Set the PHY address and the register address we want to read */
	out_be32(&regs->miimadd, (mii_id << 8) \| regnum);

	/* Clear miimcom, and then initiate a read */
	out_be32(&regs->miimcom, 0);
	out_be32(&regs->miimcom, MII_READ_COMMAND);

	/* Wait for the transaction to finish */
	while (in_be32(&regs->miimind) & (MIIMIND_NOTVALID \| MIIMIND_BUSY))
	cpu_relax();

	/* Grab the value of the register from miimstat */
	value = in_be32(&regs->miimstat);

	return value;
	}

	static struct fsl_pq_mdio __iomem fsl_pq_mdio_get_regs(struct mii_bus bus)
	{
	struct fsl_pq_mdio_priv *priv = bus->priv;

	return priv->regs;
	}

	/*
	* Write value to the PHY at mii_id at register regnum,
	* on the bus, waiting until the write is done before returning.
	*/
	int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
	{
	struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);

	/* Write to the local MII regs */
	return(fsl_pq_local_mdio_write(regs, mii_id, regnum, value));
	}

	/*
	* Read the bus for PHY at addr mii_id, register regnum, and
	* return the value. Clears miimcom first.
	*/
	int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
	{
	struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);

	/* Read the local MII regs */
	return(fsl_pq_local_mdio_read(regs, mii_id, regnum));
	}

	/* Reset the MIIM registers, and wait for the bus to free */
	static int fsl_pq_mdio_reset(struct mii_bus *bus)
	{
	struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
	int timeout = PHY_INIT_TIMEOUT;

	mutex_lock(&bus->mdio_lock);

	/* Reset the management interface */
	out_be32(&regs->miimcfg, MIIMCFG_RESET);

	/* Setup the MII Mgmt clock speed */
	out_be32(&regs->miimcfg, MIIMCFG_INIT_VALUE);

	/* Wait until the bus is free */
	while ((in_be32(&regs->miimind) & MIIMIND_BUSY) && timeout--)
	cpu_relax();

	mutex_unlock(&bus->mdio_lock);

	if (timeout < 0) {
	printk(KERN_ERR "%s: The MII Bus is stuck!\n",
	bus->name);
	return -EBUSY;
	}

	return 0;
	}

	void fsl_pq_mdio_bus_name(char name, struct device_node np)
	{
	const u32 *addr;
	u64 taddr = OF_BAD_ADDR;

	addr = of_get_address(np, 0, NULL, NULL);
	if (addr)
	taddr = of_translate_address(np, addr);

	snprintf(name, MII_BUS_ID_SIZE, "%s@%llx", np->name,
	(unsigned long long)taddr);
	}
	EXPORT_SYMBOL_GPL(fsl_pq_mdio_bus_name);

	/* Scan the bus in reverse, looking for an empty spot */
	static int fsl_pq_mdio_find_free(struct mii_bus *new_bus)
	{
	int i;

	for (i = PHY_MAX_ADDR; i > 0; i--) {
	u32 phy_id;

	if (get_phy_id(new_bus, i, &phy_id))
	return -1;

	if (phy_id == 0xffffffff)
	break;
	}

	return i;
	}


	#if defined(CONFIG_GIANFAR) \|\| defined(CONFIG_GIANFAR_MODULE)
	static u32 __iomem get_gfar_tbipa(struct fsl_pq_mdio __iomem regs, struct device_node *np)
	{
	struct gfar __iomem *enet_regs;

	/*
	* This is mildly evil, but so is our hardware for doing this.
	* Also, we have to cast back to struct gfar because of
	* definition weirdness done in gianfar.h.
	*/
	if(of_device_is_compatible(np, "fsl,gianfar-mdio") \|\|
	of_device_is_compatible(np, "fsl,gianfar-tbi") \|\|
	of_device_is_compatible(np, "gianfar")) {
	enet_regs = (struct gfar __iomem *)regs;
	return &enet_regs->tbipa;
	} else if (of_device_is_compatible(np, "fsl,etsec2-mdio") \|\|
	of_device_is_compatible(np, "fsl,etsec2-tbi")) {
	return of_iomap(np, 1);
	} else
	return NULL;
	}
	#endif


	#if defined(CONFIG_UCC_GETH) \|\| defined(CONFIG_UCC_GETH_MODULE)
	static int get_ucc_id_for_range(u64 start, u64 end, u32 *ucc_id)
	{
	struct device_node *np = NULL;
	int err = 0;

	for_each_compatible_node(np, NULL, "ucc_geth") {
	struct resource tempres;

	err = of_address_to_resource(np, 0, &tempres);
	if (err)
	continue;

	/* if our mdio regs fall within this UCC regs range */
	if ((start >= tempres.start) && (end <= tempres.end)) {
	/* Find the id of the UCC */
	const u32 *id;

	id = of_get_property(np, "cell-index", NULL);
	if (!id) {
	id = of_get_property(np, "device-id", NULL);
	if (!id)
	continue;
	}

	ucc_id = id;

	return 0;
	}
	}

	if (err)
	return err;
	else
	return -EINVAL;
	}
	#endif


	static int fsl_pq_mdio_probe(struct of_device *ofdev,
	const struct of_device_id *match)
	{
	struct device_node *np = ofdev->dev.of_node;
	struct device_node *tbi;
	struct fsl_pq_mdio_priv *priv;
	struct fsl_pq_mdio __iomem *regs = NULL;
	void __iomem *map;
	u32 __iomem *tbipa;
	struct mii_bus *new_bus;
	int tbiaddr = -1;
	const u32 *addrp;
	u64 addr = 0, size = 0;
	int err;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	new_bus = mdiobus_alloc();
	if (!new_bus) {
	err = -ENOMEM;
	goto err_free_priv;
	}

	new_bus->name = "Freescale PowerQUICC MII Bus",
	new_bus->read = &fsl_pq_mdio_read,
	new_bus->write = &fsl_pq_mdio_write,
	new_bus->reset = &fsl_pq_mdio_reset,
	new_bus->priv = priv;
	fsl_pq_mdio_bus_name(new_bus->id, np);

	addrp = of_get_address(np, 0, &size, NULL);
	if (!addrp) {
	err = -EINVAL;
	goto err_free_bus;
	}

	/* Set the PHY base address */
	addr = of_translate_address(np, addrp);
	if (addr == OF_BAD_ADDR) {
	err = -EINVAL;
	goto err_free_bus;
	}

	map = ioremap(addr, size);
	if (!map) {
	err = -ENOMEM;
	goto err_free_bus;
	}
	priv->map = map;

	if (of_device_is_compatible(np, "fsl,gianfar-mdio") \|\|
	of_device_is_compatible(np, "fsl,gianfar-tbi") \|\|
	of_device_is_compatible(np, "fsl,ucc-mdio") \|\|
	of_device_is_compatible(np, "ucc_geth_phy"))
	map -= offsetof(struct fsl_pq_mdio, miimcfg);
	regs = map;
	priv->regs = regs;

	new_bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);

	if (NULL == new_bus->irq) {
	err = -ENOMEM;
	goto err_unmap_regs;
	}

	new_bus->parent = &ofdev->dev;
	dev_set_drvdata(&ofdev->dev, new_bus);

	if (of_device_is_compatible(np, "fsl,gianfar-mdio") \|\|
	of_device_is_compatible(np, "fsl,gianfar-tbi") \|\|
	of_device_is_compatible(np, "fsl,etsec2-mdio") \|\|
	of_device_is_compatible(np, "fsl,etsec2-tbi") \|\|
	of_device_is_compatible(np, "gianfar")) {
	#if defined(CONFIG_GIANFAR) \|\| defined(CONFIG_GIANFAR_MODULE)
	tbipa = get_gfar_tbipa(regs, np);
	if (!tbipa) {
	err = -EINVAL;
	goto err_free_irqs;
	}
	#else
	err = -ENODEV;
	goto err_free_irqs;
	#endif
	} else if (of_device_is_compatible(np, "fsl,ucc-mdio") \|\|
	of_device_is_compatible(np, "ucc_geth_phy")) {
	#if defined(CONFIG_UCC_GETH) \|\| defined(CONFIG_UCC_GETH_MODULE)
	u32 id;
	static u32 mii_mng_master;

	tbipa = &regs->utbipar;

	if ((err = get_ucc_id_for_range(addr, addr + size, &id)))
	goto err_free_irqs;

	if (!mii_mng_master) {
	mii_mng_master = id;
	ucc_set_qe_mux_mii_mng(id - 1);
	}
	#else
	err = -ENODEV;
	goto err_free_irqs;
	#endif
	} else {
	err = -ENODEV;
	goto err_free_irqs;
	}

	for_each_child_of_node(np, tbi) {
	if (!strncmp(tbi->type, "tbi-phy", 8))
	break;
	}

	if (tbi) {
	const u32 *prop = of_get_property(tbi, "reg", NULL);

	if (prop)
	tbiaddr = *prop;
	}

	if (tbiaddr == -1) {
	out_be32(tbipa, 0);

	tbiaddr = fsl_pq_mdio_find_free(new_bus);
	}

	/*
	* We define TBIPA at 0 to be illegal, opting to fail for boards that
	* have PHYs at 1-31, rather than change tbipa and rescan.
	*/
	if (tbiaddr == 0) {
	err = -EBUSY;

	goto err_free_irqs;
	}

	out_be32(tbipa, tbiaddr);

	err = of_mdiobus_register(new_bus, np);
	if (err) {
	printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
	new_bus->name);
	goto err_free_irqs;
	}

	return 0;

	err_free_irqs:
	kfree(new_bus->irq);
	err_unmap_regs:
	iounmap(priv->map);
	err_free_bus:
	kfree(new_bus);
	err_free_priv:
	kfree(priv);
	return err;
	}


	static int fsl_pq_mdio_remove(struct of_device *ofdev)
	{
	struct device *device = &ofdev->dev;
	struct mii_bus *bus = dev_get_drvdata(device);
	struct fsl_pq_mdio_priv *priv = bus->priv;

	mdiobus_unregister(bus);

	dev_set_drvdata(device, NULL);

	iounmap(priv->map);
	bus->priv = NULL;
	mdiobus_free(bus);
	kfree(priv);

	return 0;
	}

	static struct of_device_id fsl_pq_mdio_match[] = {
	{
	.type = "mdio",
	.compatible = "ucc_geth_phy",
	},
	{
	.type = "mdio",
	.compatible = "gianfar",
	},
	{
	.compatible = "fsl,ucc-mdio",
	},
	{
	.compatible = "fsl,gianfar-tbi",
	},
	{
	.compatible = "fsl,gianfar-mdio",
	},
	{
	.compatible = "fsl,etsec2-tbi",
	},
	{
	.compatible = "fsl,etsec2-mdio",
	},
	{},
	};
	MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match);

	static struct of_platform_driver fsl_pq_mdio_driver = {
	.driver = {
	.name = "fsl-pq_mdio",
	.owner = THIS_MODULE,
	.of_match_table = fsl_pq_mdio_match,
	},
	.probe = fsl_pq_mdio_probe,
	.remove = fsl_pq_mdio_remove,
	};

	int __init fsl_pq_mdio_init(void)
	{
	return of_register_platform_driver(&fsl_pq_mdio_driver);
	}
	module_init(fsl_pq_mdio_init);

	void fsl_pq_mdio_exit(void)
	{
	of_unregister_platform_driver(&fsl_pq_mdio_driver);
	}
	module_exit(fsl_pq_mdio_exit);
	MODULE_LICENSE("GPL");