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/*

 * drivers/net/phy/mdio_bus.c

 *

 * MDIO Bus interface

 *

 * Author: Andy Fleming

 *

 * Copyright (c) 2004 Freescale Semiconductor, 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/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/mii.h>

#include <linux/ethtool.h>

#include <linux/phy.h>

#include <asm/io.h>

#include <asm/irq.h>

#include <asm/uaccess.h>

/**

 * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus

 * @bus: target mii_bus

 *

 * Description: Called by a bus driver to bring up all the PHYs

 *   on a given bus, and attach them to the bus.

 *

 * Returns 0 on success or < 0 on error.

 */

int mdiobus_register(struct mii_bus *bus)

{

        int i;

        int err = 0;

        spin_lock_init(&bus->mdio_lock);

        if (NULL == bus || NULL == bus->name ||

                        NULL == bus->read ||

                        NULL == bus->write)

                return -EINVAL;

        if (bus->reset)

                bus->reset(bus);

        for (i = 0; i < PHY_MAX_ADDR; i++) {

                struct phy_device *phydev;

                if (bus->phy_mask & (1 << i)) {

                        bus->phy_map[i] = NULL;

                        continue;

                }

                phydev = get_phy_device(bus, i);

                if (IS_ERR(phydev))

                        return PTR_ERR(phydev);

                /* There's a PHY at this address

                 * We need to set:

                 * 1) IRQ

                 * 2) bus_id

                 * 3) parent

                 * 4) bus

                 * 5) mii_bus

                 * And, we need to register it */

                if (phydev) {

                        phydev->irq = bus->irq[i];

                        phydev->dev.parent = bus->dev;

                        phydev->dev.bus = &mdio_bus_type;

                        snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, i);

                        phydev->bus = bus;

                        err = device_register(&phydev->dev);

                        if (err) {

                                printk(KERN_ERR "phy %d failed to register\n",

                                                i);

                                phy_device_free(phydev);

                                phydev = NULL;

                        }

                }

                bus->phy_map[i] = phydev;

        }

        pr_info("%s: probed\n", bus->name);

        return err;

}

EXPORT_SYMBOL(mdiobus_register);

void mdiobus_unregister(struct mii_bus *bus)

{

        int i;

        for (i = 0; i < PHY_MAX_ADDR; i++) {

                if (bus->phy_map[i])

                        device_unregister(&bus->phy_map[i]->dev);

        }

}

EXPORT_SYMBOL(mdiobus_unregister);

/**

 * mdio_bus_match - determine if given PHY driver supports the given PHY device

 * @dev: target PHY device

 * @drv: given PHY driver

 *

 * Description: Given a PHY device, and a PHY driver, return 1 if

 *   the driver supports the device.  Otherwise, return 0.

 */

static int mdio_bus_match(struct device *dev, struct device_driver *drv)

{

        struct phy_device *phydev = to_phy_device(dev);

        struct phy_driver *phydrv = to_phy_driver(drv);

        return ((phydrv->phy_id & phydrv->phy_id_mask) ==

                (phydev->phy_id & phydrv->phy_id_mask));

}

/* Suspend and resume.  Copied from platform_suspend and

 * platform_resume

 */

static int mdio_bus_suspend(struct device * dev, pm_message_t state)

{

        int ret = 0;

        struct device_driver *drv = dev->driver;

        if (drv && drv->suspend)

                ret = drv->suspend(dev, state);

        return ret;

}

static int mdio_bus_resume(struct device * dev)

{

        int ret = 0;

        struct device_driver *drv = dev->driver;

        if (drv && drv->resume)

                ret = drv->resume(dev);

        return ret;

}

struct bus_type mdio_bus_type = {

        .name           = "mdio_bus",

        .match          = mdio_bus_match,

        .suspend        = mdio_bus_suspend,

        .resume         = mdio_bus_resume,

};

EXPORT_SYMBOL(mdio_bus_type);

int __init mdio_bus_init(void)

{

        return bus_register(&mdio_bus_type);

}

void mdio_bus_exit(void)

{

        bus_unregister(&mdio_bus_type);

}