/* * 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);					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_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->mdio.bus != fmb->mii_bus)		return -EINVAL; 	list_for_each_entry(fp, &fmb->phys, node) {		if (fp->addr == phydev->mdio.addr) {			write_seqcount_begin(&fp->seqcount);#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(fp);			write_seqcount_end(&fp->seqcount);			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 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)) {		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; 	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);	}	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");