drivers/net/phy/fixed_phy.c - third_party/kernel - Git at Google

 /*
  * Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
  *
  * Author: Vitaly Bordug <vbordug@ru.mvista.com>
  *         Anton Vorontsov <avorontsov@ru.mvista.com>
  *
  * Copyright (c) 2006-2007 MontaVista Software, 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/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/list.h>
 #include <linux/mii.h>
 #include <linux/phy.h>
 #include <linux/phy_fixed.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/gpio.h>
 #include <linux/seqlock.h>
 #include <linux/idr.h>

 #include "swphy.h"

 struct fixed_mdio_bus {
 	struct mii_bus *mii_bus;
 	struct list_head phys;
 };

 struct fixed_phy {
 	int addr;
 	struct phy_device *phydev;
 	seqcount_t seqcount;
 	struct fixed_phy_status status;
 	int (*link_update)(struct net_device *, struct fixed_phy_status *);
 	struct list_head node;
 	int link_gpio;
 };

 static struct platform_device *pdev;
 static struct fixed_mdio_bus platform_fmb = {
 	.phys = LIST_HEAD_INIT(platform_fmb.phys),
 };

 static void fixed_phy_update(struct fixed_phy *fp)
 {
 	if (gpio_is_valid(fp->link_gpio))
 		fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
 }

 static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
 {
 	struct fixed_mdio_bus *fmb = bus->priv;
 	struct fixed_phy *fp;

 	list_for_each_entry(fp, &fmb->phys, node) {
 		if (fp->addr == phy_addr) {
 			struct fixed_phy_status state;
 			int s;

 			do {
 				s = read_seqcount_begin(&fp->seqcount);
 				/* Issue callback if user registered it. */
 				if (fp->link_update)
 					fp->link_update(fp->phydev->attached_dev,
 							&fp->status);
 				/* Check the GPIO for change in status */
 				fixed_phy_update(fp);
 				state = fp->status;
 			} while (read_seqcount_retry(&fp->seqcount, s));

 			return swphy_read_reg(reg_num, &state);
 		}
 	}

 	return 0xFFFF;
 }

 static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
 			    u16 val)
 {
 	return 0;
 }

 /*
  * If something weird is required to be done with link/speed,
  * network driver is able to assign a function to implement this.
  * May be useful for PHY's that need to be software-driven.
  */
 int fixed_phy_set_link_update(struct phy_device *phydev,
 			      int (*link_update)(struct net_device *,
 						 struct fixed_phy_status *))
 {
 	struct fixed_mdio_bus *fmb = &platform_fmb;
 	struct fixed_phy *fp;

 	if (!phydev || !phydev->mdio.bus)
 		return -EINVAL;

 	list_for_each_entry(fp, &fmb->phys, node) {
 		if (fp->addr == phydev->mdio.addr) {
 			fp->link_update = link_update;
 			fp->phydev = phydev;
 			return 0;
 		}
 	}

 	return -ENOENT;
 }
 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);

 int fixed_phy_add(unsigned int irq, int phy_addr,
 		  struct fixed_phy_status *status,
 		  int link_gpio)
 {
 	int ret;
 	struct fixed_mdio_bus *fmb = &platform_fmb;
 	struct fixed_phy *fp;

 	ret = swphy_validate_state(status);
 	if (ret < 0)
 		return ret;

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

 	seqcount_init(&fp->seqcount);

 	if (irq != PHY_POLL)
 		fmb->mii_bus->irq[phy_addr] = irq;

 	fp->addr = phy_addr;
 	fp->status = *status;
 	fp->link_gpio = link_gpio;

 	if (gpio_is_valid(fp->link_gpio)) {
 		ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
 				       "fixed-link-gpio-link");
 		if (ret)
 			goto err_regs;
 	}

 	fixed_phy_update(fp);

 	list_add_tail(&fp->node, &fmb->phys);

 	return 0;

 err_regs:
 	kfree(fp);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(fixed_phy_add);

 static DEFINE_IDA(phy_fixed_ida);

 static void fixed_phy_del(int phy_addr)
 {
 	struct fixed_mdio_bus *fmb = &platform_fmb;
 	struct fixed_phy *fp, *tmp;

 	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
 		if (fp->addr == phy_addr) {
 			list_del(&fp->node);
 			if (gpio_is_valid(fp->link_gpio))
 				gpio_free(fp->link_gpio);
 			kfree(fp);
 			ida_simple_remove(&phy_fixed_ida, phy_addr);
 			return;
 		}
 	}
 }

 struct phy_device *fixed_phy_register(unsigned int irq,
 				      struct fixed_phy_status *status,
 				      int link_gpio,
 				      struct device_node *np)
 {
 	struct fixed_mdio_bus *fmb = &platform_fmb;
 	struct phy_device *phy;
 	int phy_addr;
 	int ret;

 	if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED)
 		return ERR_PTR(-EPROBE_DEFER);

 	/* Get the next available PHY address, up to PHY_MAX_ADDR */
 	phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
 	if (phy_addr < 0)
 		return ERR_PTR(phy_addr);

 	ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
 	if (ret < 0) {
 		ida_simple_remove(&phy_fixed_ida, phy_addr);
 		return ERR_PTR(ret);
 	}

 	phy = get_phy_device(fmb->mii_bus, phy_addr, false);
 	if (IS_ERR(phy)) {
 		fixed_phy_del(phy_addr);
 		return ERR_PTR(-EINVAL);
 	}

 	/* propagate the fixed link values to struct phy_device */
 	phy->link = status->link;
 	if (status->link) {
 		phy->speed = status->speed;
 		phy->duplex = status->duplex;
 		phy->pause = status->pause;
 		phy->asym_pause = status->asym_pause;
 	}

 	of_node_get(np);
 	phy->mdio.dev.of_node = np;
 	phy->is_pseudo_fixed_link = true;

 	switch (status->speed) {
 	case SPEED_1000:
 		phy->supported = PHY_1000BT_FEATURES;
 		break;
 	case SPEED_100:
 		phy->supported = PHY_100BT_FEATURES;
 		break;
 	case SPEED_10:
 	default:
 		phy->supported = PHY_10BT_FEATURES;
 	}

 	ret = phy_device_register(phy);
 	if (ret) {
 		phy_device_free(phy);
 		of_node_put(np);
 		fixed_phy_del(phy_addr);
 		return ERR_PTR(ret);
 	}

 	return phy;
 }
 EXPORT_SYMBOL_GPL(fixed_phy_register);

 void fixed_phy_unregister(struct phy_device *phy)
 {
 	phy_device_remove(phy);
 	of_node_put(phy->mdio.dev.of_node);
 	fixed_phy_del(phy->mdio.addr);
 }
 EXPORT_SYMBOL_GPL(fixed_phy_unregister);

 static int __init fixed_mdio_bus_init(void)
 {
 	struct fixed_mdio_bus *fmb = &platform_fmb;
 	int ret;

 	pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
 	if (IS_ERR(pdev))
 		return PTR_ERR(pdev);

 	fmb->mii_bus = mdiobus_alloc();
 	if (fmb->mii_bus == NULL) {
 		ret = -ENOMEM;
 		goto err_mdiobus_reg;
 	}

 	snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
 	fmb->mii_bus->name = "Fixed MDIO Bus";
 	fmb->mii_bus->priv = fmb;
 	fmb->mii_bus->parent = &pdev->dev;
 	fmb->mii_bus->read = &fixed_mdio_read;
 	fmb->mii_bus->write = &fixed_mdio_write;

 	ret = mdiobus_register(fmb->mii_bus);
 	if (ret)
 		goto err_mdiobus_alloc;

 	return 0;

 err_mdiobus_alloc:
 	mdiobus_free(fmb->mii_bus);
 err_mdiobus_reg:
 	platform_device_unregister(pdev);
 	return ret;
 }
 module_init(fixed_mdio_bus_init);

 static void __exit fixed_mdio_bus_exit(void)
 {
 	struct fixed_mdio_bus *fmb = &platform_fmb;
 	struct fixed_phy *fp, *tmp;

 	mdiobus_unregister(fmb->mii_bus);
 	mdiobus_free(fmb->mii_bus);
 	platform_device_unregister(pdev);

 	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
 		list_del(&fp->node);
 		kfree(fp);
 	}
 	ida_destroy(&phy_fixed_ida);
 }
 module_exit(fixed_mdio_bus_exit);

 MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
 MODULE_AUTHOR("Vitaly Bordug");
 MODULE_LICENSE("GPL");
	/*
	* Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
	*
	* Author: Vitaly Bordug <vbordug@ru.mvista.com>
	* Anton Vorontsov <avorontsov@ru.mvista.com>
	*
	* Copyright (c) 2006-2007 MontaVista Software, 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/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/list.h>
	#include <linux/mii.h>
	#include <linux/phy.h>
	#include <linux/phy_fixed.h>
	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/of.h>
	#include <linux/gpio.h>
	#include <linux/seqlock.h>
	#include <linux/idr.h>

	#include "swphy.h"

	struct fixed_mdio_bus {
	struct mii_bus *mii_bus;
	struct list_head phys;
	};

	struct fixed_phy {
	int addr;
	struct phy_device *phydev;
	seqcount_t seqcount;
	struct fixed_phy_status status;
	int (link_update)(struct net_device , struct fixed_phy_status *);
	struct list_head node;
	int link_gpio;
	};

	static struct platform_device *pdev;
	static struct fixed_mdio_bus platform_fmb = {
	.phys = LIST_HEAD_INIT(platform_fmb.phys),
	};

	static void fixed_phy_update(struct fixed_phy *fp)
	{
	if (gpio_is_valid(fp->link_gpio))
	fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
	}

	static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
	{
	struct fixed_mdio_bus *fmb = bus->priv;
	struct fixed_phy *fp;

	list_for_each_entry(fp, &fmb->phys, node) {
	if (fp->addr == phy_addr) {
	struct fixed_phy_status state;
	int s;

	do {
	s = read_seqcount_begin(&fp->seqcount);
	/* Issue callback if user registered it. */
	if (fp->link_update)
	fp->link_update(fp->phydev->attached_dev,
	&fp->status);
	/* Check the GPIO for change in status */
	fixed_phy_update(fp);
	state = fp->status;
	} while (read_seqcount_retry(&fp->seqcount, s));

	return swphy_read_reg(reg_num, &state);
	}
	}

	return 0xFFFF;
	}

	static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
	u16 val)
	{
	return 0;
	}

	/*
	* If something weird is required to be done with link/speed,
	* network driver is able to assign a function to implement this.
	* May be useful for PHY's that need to be software-driven.
	*/
	int fixed_phy_set_link_update(struct phy_device *phydev,
	int (link_update)(struct net_device ,
	struct fixed_phy_status *))
	{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp;

	if (!phydev \|\| !phydev->mdio.bus)
	return -EINVAL;

	list_for_each_entry(fp, &fmb->phys, node) {
	if (fp->addr == phydev->mdio.addr) {
	fp->link_update = link_update;
	fp->phydev = phydev;
	return 0;
	}
	}

	return -ENOENT;
	}
	EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);

	int fixed_phy_add(unsigned int irq, int phy_addr,
	struct fixed_phy_status *status,
	int link_gpio)
	{
	int ret;
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp;

	ret = swphy_validate_state(status);
	if (ret < 0)
	return ret;

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

	seqcount_init(&fp->seqcount);

	if (irq != PHY_POLL)
	fmb->mii_bus->irq[phy_addr] = irq;

	fp->addr = phy_addr;
	fp->status = *status;
	fp->link_gpio = link_gpio;

	if (gpio_is_valid(fp->link_gpio)) {
	ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
	"fixed-link-gpio-link");
	if (ret)
	goto err_regs;
	}

	fixed_phy_update(fp);

	list_add_tail(&fp->node, &fmb->phys);

	return 0;

	err_regs:
	kfree(fp);
	return ret;
	}
	EXPORT_SYMBOL_GPL(fixed_phy_add);

	static DEFINE_IDA(phy_fixed_ida);

	static void fixed_phy_del(int phy_addr)
	{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy fp, tmp;

	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
	if (fp->addr == phy_addr) {
	list_del(&fp->node);
	if (gpio_is_valid(fp->link_gpio))
	gpio_free(fp->link_gpio);
	kfree(fp);
	ida_simple_remove(&phy_fixed_ida, phy_addr);
	return;
	}
	}
	}

	struct phy_device *fixed_phy_register(unsigned int irq,
	struct fixed_phy_status *status,
	int link_gpio,
	struct device_node *np)
	{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct phy_device *phy;
	int phy_addr;
	int ret;

	if (!fmb->mii_bus \|\| fmb->mii_bus->state != MDIOBUS_REGISTERED)
	return ERR_PTR(-EPROBE_DEFER);

	/* Get the next available PHY address, up to PHY_MAX_ADDR */
	phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
	if (phy_addr < 0)
	return ERR_PTR(phy_addr);

	ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
	if (ret < 0) {
	ida_simple_remove(&phy_fixed_ida, phy_addr);
	return ERR_PTR(ret);
	}

	phy = get_phy_device(fmb->mii_bus, phy_addr, false);
	if (IS_ERR(phy)) {
	fixed_phy_del(phy_addr);
	return ERR_PTR(-EINVAL);
	}

	/* propagate the fixed link values to struct phy_device */
	phy->link = status->link;
	if (status->link) {
	phy->speed = status->speed;
	phy->duplex = status->duplex;
	phy->pause = status->pause;
	phy->asym_pause = status->asym_pause;
	}

	of_node_get(np);
	phy->mdio.dev.of_node = np;
	phy->is_pseudo_fixed_link = true;

	switch (status->speed) {
	case SPEED_1000:
	phy->supported = PHY_1000BT_FEATURES;
	break;
	case SPEED_100:
	phy->supported = PHY_100BT_FEATURES;
	break;
	case SPEED_10:
	default:
	phy->supported = PHY_10BT_FEATURES;
	}

	ret = phy_device_register(phy);
	if (ret) {
	phy_device_free(phy);
	of_node_put(np);
	fixed_phy_del(phy_addr);
	return ERR_PTR(ret);
	}

	return phy;
	}
	EXPORT_SYMBOL_GPL(fixed_phy_register);

	void fixed_phy_unregister(struct phy_device *phy)
	{
	phy_device_remove(phy);
	of_node_put(phy->mdio.dev.of_node);
	fixed_phy_del(phy->mdio.addr);
	}
	EXPORT_SYMBOL_GPL(fixed_phy_unregister);

	static int __init fixed_mdio_bus_init(void)
	{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	int ret;

	pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
	if (IS_ERR(pdev))
	return PTR_ERR(pdev);

	fmb->mii_bus = mdiobus_alloc();
	if (fmb->mii_bus == NULL) {
	ret = -ENOMEM;
	goto err_mdiobus_reg;
	}

	snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
	fmb->mii_bus->name = "Fixed MDIO Bus";
	fmb->mii_bus->priv = fmb;
	fmb->mii_bus->parent = &pdev->dev;
	fmb->mii_bus->read = &fixed_mdio_read;
	fmb->mii_bus->write = &fixed_mdio_write;

	ret = mdiobus_register(fmb->mii_bus);
	if (ret)
	goto err_mdiobus_alloc;

	return 0;

	err_mdiobus_alloc:
	mdiobus_free(fmb->mii_bus);
	err_mdiobus_reg:
	platform_device_unregister(pdev);
	return ret;
	}
	module_init(fixed_mdio_bus_init);

	static void __exit fixed_mdio_bus_exit(void)
	{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy fp, tmp;

	mdiobus_unregister(fmb->mii_bus);
	mdiobus_free(fmb->mii_bus);
	platform_device_unregister(pdev);

	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
	list_del(&fp->node);
	kfree(fp);
	}
	ida_destroy(&phy_fixed_ida);
	}
	module_exit(fixed_mdio_bus_exit);

	MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
	MODULE_AUTHOR("Vitaly Bordug");
	MODULE_LICENSE("GPL");