drivers/net/phy/fixed_phy.c - kernel/bruno - 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>

 #define MII_REGS_NUM 29

 struct fixed_mdio_bus {
 	int irqs[PHY_MAX_ADDR];
 	struct mii_bus *mii_bus;
 	struct list_head phys;
 };

 struct fixed_phy {
 	int addr;
 	u16 regs[MII_REGS_NUM];
 	struct phy_device *phydev;
 	struct fixed_phy_status status;
 	int (*link_update)(struct net_device *, struct fixed_phy_status *);
 	struct list_head node;
 };

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

 static int fixed_phy_update_regs(struct fixed_phy *fp)
 {
 	u16 bmsr = BMSR_ANEGCAPABLE;
 	u16 bmcr = 0;
 	u16 lpagb = 0;
 	u16 lpa = 0;

 	if (fp->status.duplex) {
 		bmcr |= BMCR_FULLDPLX;

 		switch (fp->status.speed) {
 		case 1000:
 			bmsr |= BMSR_ESTATEN;
 			bmcr |= BMCR_SPEED1000;
 			lpagb |= LPA_1000FULL;
 			break;
 		case 100:
 			bmsr |= BMSR_100FULL;
 			bmcr |= BMCR_SPEED100;
 			lpa |= LPA_100FULL;
 			break;
 		case 10:
 			bmsr |= BMSR_10FULL;
 			lpa |= LPA_10FULL;
 			break;
 		default:
 			pr_warn("fixed phy: unknown speed\n");
 			return -EINVAL;
 		}
 	} else {
 		switch (fp->status.speed) {
 		case 1000:
 			bmsr |= BMSR_ESTATEN;
 			bmcr |= BMCR_SPEED1000;
 			lpagb |= LPA_1000HALF;
 			break;
 		case 100:
 			bmsr |= BMSR_100HALF;
 			bmcr |= BMCR_SPEED100;
 			lpa |= LPA_100HALF;
 			break;
 		case 10:
 			bmsr |= BMSR_10HALF;
 			lpa |= LPA_10HALF;
 			break;
 		default:
 			pr_warn("fixed phy: unknown speed\n");
 			return -EINVAL;
 		}
 	}

 	if (fp->status.link)
 		bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;

 	if (fp->status.pause)
 		lpa |= LPA_PAUSE_CAP;

 	if (fp->status.asym_pause)
 		lpa |= LPA_PAUSE_ASYM;

 	fp->regs[MII_PHYSID1] = 0;
 	fp->regs[MII_PHYSID2] = 0;

 	fp->regs[MII_BMSR] = bmsr;
 	fp->regs[MII_BMCR] = bmcr;
 	fp->regs[MII_LPA] = lpa;
 	fp->regs[MII_STAT1000] = lpagb;

 	return 0;
 }

 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;

 	if (reg_num >= MII_REGS_NUM)
 		return -1;

 	/* We do not support emulating Clause 45 over Clause 22 register reads
 	 * return an error instead of bogus data.
 	 */
 	switch (reg_num) {
 	case MII_MMD_CTRL:
 	case MII_MMD_DATA:
 		return -1;
 	default:
 		break;
 	}

 	list_for_each_entry(fp, &fmb->phys, node) {
 		if (fp->addr == phy_addr) {
 			/* Issue callback if user registered it. */
 			if (fp->link_update) {
 				fp->link_update(fp->phydev->attached_dev,
 						&fp->status);
 				fixed_phy_update_regs(fp);
 			}
 			return fp->regs[reg_num];
 		}
 	}

 	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 (!link_update || !phydev || !phydev->bus)
 		return -EINVAL;

 	list_for_each_entry(fp, &fmb->phys, node) {
 		if (fp->addr == phydev->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 ret;
 	struct fixed_mdio_bus *fmb = &platform_fmb;
 	struct fixed_phy *fp;

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

 	memset(fp->regs, 0xFF,  sizeof(fp->regs[0]) * MII_REGS_NUM);

 	fmb->irqs[phy_addr] = irq;

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

 	ret = fixed_phy_update_regs(fp);
 	if (ret)
 		goto err_regs;

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

 	return 0;

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

 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);
 			kfree(fp);
 			return;
 		}
 	}
 }
 EXPORT_SYMBOL_GPL(fixed_phy_del);

 static int phy_fixed_addr;
 static DEFINE_SPINLOCK(phy_fixed_addr_lock);

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

 	/* Get the next available PHY address, up to PHY_MAX_ADDR */
 	spin_lock(&phy_fixed_addr_lock);
 	if (phy_fixed_addr == PHY_MAX_ADDR) {
 		spin_unlock(&phy_fixed_addr_lock);
 		return ERR_PTR(-ENOSPC);
 	}
 	phy_addr = phy_fixed_addr++;
 	spin_unlock(&phy_fixed_addr_lock);

 	ret = fixed_phy_add(PHY_POLL, phy_addr, status);
 	if (ret < 0)
 		return ERR_PTR(ret);

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

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

 	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);

 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)) {
 		ret = PTR_ERR(pdev);
 		goto 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;
 	fmb->mii_bus->irq = fmb->irqs;

 	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);
 err_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);
 	}
 }
 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>

	#define MII_REGS_NUM 29

	struct fixed_mdio_bus {
	int irqs[PHY_MAX_ADDR];
	struct mii_bus *mii_bus;
	struct list_head phys;
	};

	struct fixed_phy {
	int addr;
	u16 regs[MII_REGS_NUM];
	struct phy_device *phydev;
	struct fixed_phy_status status;
	int (link_update)(struct net_device , struct fixed_phy_status *);
	struct list_head node;
	};

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

	static int fixed_phy_update_regs(struct fixed_phy *fp)
	{
	u16 bmsr = BMSR_ANEGCAPABLE;
	u16 bmcr = 0;
	u16 lpagb = 0;
	u16 lpa = 0;

	if (fp->status.duplex) {
	bmcr \|= BMCR_FULLDPLX;

	switch (fp->status.speed) {
	case 1000:
	bmsr \|= BMSR_ESTATEN;
	bmcr \|= BMCR_SPEED1000;
	lpagb \|= LPA_1000FULL;
	break;
	case 100:
	bmsr \|= BMSR_100FULL;
	bmcr \|= BMCR_SPEED100;
	lpa \|= LPA_100FULL;
	break;
	case 10:
	bmsr \|= BMSR_10FULL;
	lpa \|= LPA_10FULL;
	break;
	default:
	pr_warn("fixed phy: unknown speed\n");
	return -EINVAL;
	}
	} else {
	switch (fp->status.speed) {
	case 1000:
	bmsr \|= BMSR_ESTATEN;
	bmcr \|= BMCR_SPEED1000;
	lpagb \|= LPA_1000HALF;
	break;
	case 100:
	bmsr \|= BMSR_100HALF;
	bmcr \|= BMCR_SPEED100;
	lpa \|= LPA_100HALF;
	break;
	case 10:
	bmsr \|= BMSR_10HALF;
	lpa \|= LPA_10HALF;
	break;
	default:
	pr_warn("fixed phy: unknown speed\n");
	return -EINVAL;
	}
	}

	if (fp->status.link)
	bmsr \|= BMSR_LSTATUS \| BMSR_ANEGCOMPLETE;

	if (fp->status.pause)
	lpa \|= LPA_PAUSE_CAP;

	if (fp->status.asym_pause)
	lpa \|= LPA_PAUSE_ASYM;

	fp->regs[MII_PHYSID1] = 0;
	fp->regs[MII_PHYSID2] = 0;

	fp->regs[MII_BMSR] = bmsr;
	fp->regs[MII_BMCR] = bmcr;
	fp->regs[MII_LPA] = lpa;
	fp->regs[MII_STAT1000] = lpagb;

	return 0;
	}

	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;

	if (reg_num >= MII_REGS_NUM)
	return -1;

	/* We do not support emulating Clause 45 over Clause 22 register reads
	* return an error instead of bogus data.
	*/
	switch (reg_num) {
	case MII_MMD_CTRL:
	case MII_MMD_DATA:
	return -1;
	default:
	break;
	}

	list_for_each_entry(fp, &fmb->phys, node) {
	if (fp->addr == phy_addr) {
	/* Issue callback if user registered it. */
	if (fp->link_update) {
	fp->link_update(fp->phydev->attached_dev,
	&fp->status);
	fixed_phy_update_regs(fp);
	}
	return fp->regs[reg_num];
	}
	}

	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 (!link_update \|\| !phydev \|\| !phydev->bus)
	return -EINVAL;

	list_for_each_entry(fp, &fmb->phys, node) {
	if (fp->addr == phydev->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 ret;
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp;

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

	memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);

	fmb->irqs[phy_addr] = irq;

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

	ret = fixed_phy_update_regs(fp);
	if (ret)
	goto err_regs;

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

	return 0;

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

	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);
	kfree(fp);
	return;
	}
	}
	}
	EXPORT_SYMBOL_GPL(fixed_phy_del);

	static int phy_fixed_addr;
	static DEFINE_SPINLOCK(phy_fixed_addr_lock);

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

	/* Get the next available PHY address, up to PHY_MAX_ADDR */
	spin_lock(&phy_fixed_addr_lock);
	if (phy_fixed_addr == PHY_MAX_ADDR) {
	spin_unlock(&phy_fixed_addr_lock);
	return ERR_PTR(-ENOSPC);
	}
	phy_addr = phy_fixed_addr++;
	spin_unlock(&phy_fixed_addr_lock);

	ret = fixed_phy_add(PHY_POLL, phy_addr, status);
	if (ret < 0)
	return ERR_PTR(ret);

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

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

	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);

	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)) {
	ret = PTR_ERR(pdev);
	goto 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;
	fmb->mii_bus->irq = fmb->irqs;

	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);
	err_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);
	}
	}
	module_exit(fixed_mdio_bus_exit);

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