/* * 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 (!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_update_state(struct phy_device *phydev,			   const struct fixed_phy_status *status,			   const struct fixed_phy_status *changed){	struct fixed_mdio_bus *fmb = &platform_fmb;	struct fixed_phy *fp; 	if (!phydev || !phydev->bus)		return -EINVAL; 	list_for_each_entry(fp, &fmb->phys, node) {		if (fp->addr == phydev->addr) {#define _UPD(x) if (changed->x) \	fp->status.x = status->x			_UPD(link);			_UPD(speed);			_UPD(duplex);			_UPD(pause);			_UPD(asym_pause);#undef _UPD			fixed_phy_update_regs(fp);			return 0;		}	} 	return -ENOENT;}EXPORT_SYMBOL(fixed_phy_update_state); 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);	} 	/* 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->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");