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/*

 * drivers/net/phy/phy_device.c

 *

 * Framework for finding and configuring PHYs.

 * Also contains generic PHY driver

 *

 * 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>

MODULE_DESCRIPTION("PHY library");

MODULE_AUTHOR("Andy Fleming");

MODULE_LICENSE("GPL");

static struct phy_driver genphy_driver;

extern int mdio_bus_init(void);

extern void mdio_bus_exit(void);

void phy_device_free(struct phy_device *phydev)

{

        kfree(phydev);

}

static void phy_device_release(struct device *dev)

{

        phy_device_free(to_phy_device(dev));

}

struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id)

{

        struct phy_device *dev;

        /* We allocate the device, and initialize the

         * default values */

        dev = kzalloc(sizeof(*dev), GFP_KERNEL);

        if (NULL == dev)

                return (struct phy_device*) PTR_ERR((void*)-ENOMEM);

        dev->dev.release = phy_device_release;

        dev->speed = 0;

        dev->duplex = -1;

        dev->pause = dev->asym_pause = 0;

        dev->link = 1;

        dev->interface = PHY_INTERFACE_MODE_GMII;

        dev->autoneg = AUTONEG_ENABLE;

        dev->addr = addr;

        dev->phy_id = phy_id;

        dev->bus = bus;

        dev->state = PHY_DOWN;

        spin_lock_init(&dev->lock);

        return dev;

}

EXPORT_SYMBOL(phy_device_create);

/**

 * get_phy_device - reads the specified PHY device and returns its @phy_device struct

 * @bus: the target MII bus

 * @addr: PHY address on the MII bus

 *

 * Description: Reads the ID registers of the PHY at @addr on the

 *   @bus, then allocates and returns the phy_device to represent it.

 */

struct phy_device * get_phy_device(struct mii_bus *bus, int addr)

{

        int phy_reg;

        u32 phy_id;

        struct phy_device *dev = NULL;

        /* Grab the bits from PHYIR1, and put them

         * in the upper half */

        phy_reg = bus->read(bus, addr, MII_PHYSID1);

        if (phy_reg < 0)

                return ERR_PTR(phy_reg);

        phy_id = (phy_reg & 0xffff) << 16;

        /* Grab the bits from PHYIR2, and put them in the lower half */

        phy_reg = bus->read(bus, addr, MII_PHYSID2);

        if (phy_reg < 0)

                return ERR_PTR(phy_reg);

        phy_id |= (phy_reg & 0xffff);

        /* If the phy_id is all Fs, there is no device there */

        if (0xffffffff == phy_id)

                return NULL;

        dev = phy_device_create(bus, addr, phy_id);

        return dev;

}

/**

 * phy_prepare_link - prepares the PHY layer to monitor link status

 * @phydev: target phy_device struct

 * @handler: callback function for link status change notifications

 *

 * Description: Tells the PHY infrastructure to handle the

 *   gory details on monitoring link status (whether through

 *   polling or an interrupt), and to call back to the

 *   connected device driver when the link status changes.

 *   If you want to monitor your own link state, don't call

 *   this function.

 */

void phy_prepare_link(struct phy_device *phydev,

                void (*handler)(struct net_device *))

{

        phydev->adjust_link = handler;

}

/**

 * phy_connect - connect an ethernet device to a PHY device

 * @dev: the network device to connect

 * @phy_id: the PHY device to connect

 * @handler: callback function for state change notifications

 * @flags: PHY device's dev_flags

 * @interface: PHY device's interface

 *

 * Description: Convenience function for connecting ethernet

 *   devices to PHY devices.  The default behavior is for

 *   the PHY infrastructure to handle everything, and only notify

 *   the connected driver when the link status changes.  If you

 *   don't want, or can't use the provided functionality, you may

 *   choose to call only the subset of functions which provide

 *   the desired functionality.

 */

struct phy_device * phy_connect(struct net_device *dev, const char *phy_id,

                void (*handler)(struct net_device *), u32 flags,

                phy_interface_t interface)

{

        struct phy_device *phydev;

        phydev = phy_attach(dev, phy_id, flags, interface);

        if (IS_ERR(phydev))

                return phydev;

        phy_prepare_link(phydev, handler);

        phy_start_machine(phydev, NULL);

        if (phydev->irq > 0)

                phy_start_interrupts(phydev);

        return phydev;

}

EXPORT_SYMBOL(phy_connect);

/**

 * phy_disconnect - disable interrupts, stop state machine, and detach a PHY device

 * @phydev: target phy_device struct

 */

void phy_disconnect(struct phy_device *phydev)

{

        if (phydev->irq > 0)

                phy_stop_interrupts(phydev);

        phy_stop_machine(phydev);

        phydev->adjust_link = NULL;

        phy_detach(phydev);

}

EXPORT_SYMBOL(phy_disconnect);

static int phy_compare_id(struct device *dev, void *data)

{

        return strcmp((char *)data, dev->bus_id) ? 0 : 1;

}

/**

 * phy_attach - attach a network device to a particular PHY device

 * @dev: network device to attach

 * @phy_id: PHY device to attach

 * @flags: PHY device's dev_flags

 * @interface: PHY device's interface

 *

 * Description: Called by drivers to attach to a particular PHY

 *     device. The phy_device is found, and properly hooked up

 *     to the phy_driver.  If no driver is attached, then the

 *     genphy_driver is used.  The phy_device is given a ptr to

 *     the attaching device, and given a callback for link status

 *     change.  The phy_device is returned to the attaching driver.

 */

struct phy_device *phy_attach(struct net_device *dev,

                const char *phy_id, u32 flags, phy_interface_t interface)

{

        struct bus_type *bus = &mdio_bus_type;

        struct phy_device *phydev;

        struct device *d;

        /* Search the list of PHY devices on the mdio bus for the

         * PHY with the requested name */

        d = bus_find_device(bus, NULL, (void *)phy_id, phy_compare_id);

        if (d) {

                phydev = to_phy_device(d);

        } else {

                printk(KERN_ERR "%s not found\n", phy_id);

                return ERR_PTR(-ENODEV);

        }

        /* Assume that if there is no driver, that it doesn't

         * exist, and we should use the genphy driver. */

        if (NULL == d->driver) {

                int err;

                d->driver = &genphy_driver.driver;

                err = d->driver->probe(d);

                if (err >= 0)

                        err = device_bind_driver(d);

                if (err)

                        return ERR_PTR(err);

        }

        if (phydev->attached_dev) {

                printk(KERN_ERR "%s: %s already attached\n",

                                dev->name, phy_id);

                return ERR_PTR(-EBUSY);

        }

        phydev->attached_dev = dev;

        phydev->dev_flags = flags;

        phydev->interface = interface;

        /* Do initial configuration here, now that

         * we have certain key parameters

         * (dev_flags and interface) */

        if (phydev->drv->config_init) {

                int err;

                err = phydev->drv->config_init(phydev);

                if (err < 0)

                        return ERR_PTR(err);

        }

        return phydev;

}

EXPORT_SYMBOL(phy_attach);

/**

 * phy_detach - detach a PHY device from its network device

 * @phydev: target phy_device struct

 */

void phy_detach(struct phy_device *phydev)

{

        phydev->attached_dev = NULL;

        /* If the device had no specific driver before (i.e. - it

         * was using the generic driver), we unbind the device

         * from the generic driver so that there's a chance a

         * real driver could be loaded */

        if (phydev->dev.driver == &genphy_driver.driver)

                device_release_driver(&phydev->dev);

}

EXPORT_SYMBOL(phy_detach);

/* Generic PHY support and helper functions */

/**

 * genphy_config_advert - sanitize and advertise auto-negotation parameters

 * @phydev: target phy_device struct

 *

 * Description: Writes MII_ADVERTISE with the appropriate values,

 *   after sanitizing the values to make sure we only advertise

 *   what is supported.

 */

int genphy_config_advert(struct phy_device *phydev)

{

        u32 advertise;

        int adv;

        int err;

        /* Only allow advertising what

         * this PHY supports */

        phydev->advertising &= phydev->supported;

        advertise = phydev->advertising;

        /* Setup standard advertisement */

        adv = phy_read(phydev, MII_ADVERTISE);

        if (adv < 0)

                return adv;

        adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |

                 ADVERTISE_PAUSE_ASYM);

        if (advertise & ADVERTISED_10baseT_Half)

                adv |= ADVERTISE_10HALF;

        if (advertise & ADVERTISED_10baseT_Full)

                adv |= ADVERTISE_10FULL;

        if (advertise & ADVERTISED_100baseT_Half)

                adv |= ADVERTISE_100HALF;

        if (advertise & ADVERTISED_100baseT_Full)

                adv |= ADVERTISE_100FULL;

        if (advertise & ADVERTISED_Pause)

                adv |= ADVERTISE_PAUSE_CAP;

        if (advertise & ADVERTISED_Asym_Pause)

                adv |= ADVERTISE_PAUSE_ASYM;

        err = phy_write(phydev, MII_ADVERTISE, adv);

        if (err < 0)

                return err;

        /* Configure gigabit if it's supported */

        if (phydev->supported & (SUPPORTED_1000baseT_Half |

                                SUPPORTED_1000baseT_Full)) {

                adv = phy_read(phydev, MII_CTRL1000);

                if (adv < 0)

                        return adv;

                adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);

                if (advertise & SUPPORTED_1000baseT_Half)

                        adv |= ADVERTISE_1000HALF;

                if (advertise & SUPPORTED_1000baseT_Full)

                        adv |= ADVERTISE_1000FULL;

                err = phy_write(phydev, MII_CTRL1000, adv);

                if (err < 0)

                        return err;

        }

        return adv;

}

EXPORT_SYMBOL(genphy_config_advert);

/**

 * genphy_setup_forced - configures/forces speed/duplex from @phydev

 * @phydev: target phy_device struct

 *

 * Description: Configures MII_BMCR to force speed/duplex

 *   to the values in phydev. Assumes that the values are valid.

 *   Please see phy_sanitize_settings().

 */

int genphy_setup_forced(struct phy_device *phydev)

{

        int ctl = 0;

        phydev->pause = phydev->asym_pause = 0;

        if (SPEED_1000 == phydev->speed)

                ctl |= BMCR_SPEED1000;

        else if (SPEED_100 == phydev->speed)

                ctl |= BMCR_SPEED100;

        if (DUPLEX_FULL == phydev->duplex)

                ctl |= BMCR_FULLDPLX;

        ctl = phy_write(phydev, MII_BMCR, ctl);

        if (ctl < 0)

                return ctl;

        /* We just reset the device, so we'd better configure any

         * settings the PHY requires to operate */

        if (phydev->drv->config_init)

                ctl = phydev->drv->config_init(phydev);

        return ctl;

}

/**

 * genphy_restart_aneg - Enable and Restart Autonegotiation

 * @phydev: target phy_device struct

 */

int genphy_restart_aneg(struct phy_device *phydev)

{

        int ctl;

        ctl = phy_read(phydev, MII_BMCR);

        if (ctl < 0)

                return ctl;

        ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);

        /* Don't isolate the PHY if we're negotiating */

        ctl &= ~(BMCR_ISOLATE);

        ctl = phy_write(phydev, MII_BMCR, ctl);

        return ctl;

}

/**

 * genphy_config_aneg - restart auto-negotiation or write BMCR

 * @phydev: target phy_device struct

 *

 * Description: If auto-negotiation is enabled, we configure the

 *   advertising, and then restart auto-negotiation.  If it is not

 *   enabled, then we write the BMCR.

 */

int genphy_config_aneg(struct phy_device *phydev)

{

        int err = 0;

        if (AUTONEG_ENABLE == phydev->autoneg) {

                err = genphy_config_advert(phydev);

                if (err < 0)

                        return err;

                err = genphy_restart_aneg(phydev);

        } else

                err = genphy_setup_forced(phydev);

        return err;

}

EXPORT_SYMBOL(genphy_config_aneg);

/**

 * genphy_update_link - update link status in @phydev

 * @phydev: target phy_device struct

 *

 * Description: Update the value in phydev->link to reflect the

 *   current link value.  In order to do this, we need to read

 *   the status register twice, keeping the second value.

 */

int genphy_update_link(struct phy_device *phydev)

{

        int status;

        /* Do a fake read */

        status = phy_read(phydev, MII_BMSR);

        if (status < 0)

                return status;

        /* Read link and autonegotiation status */

        status = phy_read(phydev, MII_BMSR);

        if (status < 0)

                return status;

        if ((status & BMSR_LSTATUS) == 0)

                phydev->link = 0;

        else

                phydev->link = 1;

        return 0;

}

EXPORT_SYMBOL(genphy_update_link);

/**

 * genphy_read_status - check the link status and update current link state

 * @phydev: target phy_device struct

 *

 * Description: Check the link, then figure out the current state

 *   by comparing what we advertise with what the link partner

 *   advertises.  Start by checking the gigabit possibilities,

 *   then move on to 10/100.

 */

int genphy_read_status(struct phy_device *phydev)

{

        int adv;

        int err;

        int lpa;

        int lpagb = 0;

        /* Update the link, but return if there

         * was an error */

        err = genphy_update_link(phydev);

        if (err)

                return err;

        if (AUTONEG_ENABLE == phydev->autoneg) {

                if (phydev->supported & (SUPPORTED_1000baseT_Half

                                        | SUPPORTED_1000baseT_Full)) {

                        lpagb = phy_read(phydev, MII_STAT1000);

                        if (lpagb < 0)

                                return lpagb;

                        adv = phy_read(phydev, MII_CTRL1000);

                        if (adv < 0)

                                return adv;

                        lpagb &= adv << 2;

                }

                lpa = phy_read(phydev, MII_LPA);

                if (lpa < 0)

                        return lpa;

                adv = phy_read(phydev, MII_ADVERTISE);

                if (adv < 0)

                        return adv;

                lpa &= adv;

                phydev->speed = SPEED_10;

                phydev->duplex = DUPLEX_HALF;

                phydev->pause = phydev->asym_pause = 0;

                if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {

                        phydev->speed = SPEED_1000;

                        if (lpagb & LPA_1000FULL)

                                phydev->duplex = DUPLEX_FULL;

                } else if (lpa & (LPA_100FULL | LPA_100HALF)) {

                        phydev->speed = SPEED_100;

                        if (lpa & LPA_100FULL)

                                phydev->duplex = DUPLEX_FULL;

                } else

                        if (lpa & LPA_10FULL)

                                phydev->duplex = DUPLEX_FULL;

                if (phydev->duplex == DUPLEX_FULL){

                        phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;

                        phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;

                }

        } else {

                int bmcr = phy_read(phydev, MII_BMCR);

                if (bmcr < 0)

                        return bmcr;

                if (bmcr & BMCR_FULLDPLX)

                        phydev->duplex = DUPLEX_FULL;

                else

                        phydev->duplex = DUPLEX_HALF;

                if (bmcr & BMCR_SPEED1000)

                        phydev->speed = SPEED_1000;

                else if (bmcr & BMCR_SPEED100)

                        phydev->speed = SPEED_100;

                else

                        phydev->speed = SPEED_10;

                phydev->pause = phydev->asym_pause = 0;

        }

        return 0;

}

EXPORT_SYMBOL(genphy_read_status);

static int genphy_config_init(struct phy_device *phydev)

{

        int val;

        u32 features;

        /* For now, I'll claim that the generic driver supports

         * all possible port types */

        features = (SUPPORTED_TP | SUPPORTED_MII

                        | SUPPORTED_AUI | SUPPORTED_FIBRE |

                        SUPPORTED_BNC);

        /* Do we support autonegotiation? */

        val = phy_read(phydev, MII_BMSR);

        if (val < 0)

                return val;

        if (val & BMSR_ANEGCAPABLE)

                features |= SUPPORTED_Autoneg;

        if (val & BMSR_100FULL)

                features |= SUPPORTED_100baseT_Full;

        if (val & BMSR_100HALF)

                features |= SUPPORTED_100baseT_Half;

        if (val & BMSR_10FULL)

                features |= SUPPORTED_10baseT_Full;

        if (val & BMSR_10HALF)

                features |= SUPPORTED_10baseT_Half;

        if (val & BMSR_ESTATEN) {

                val = phy_read(phydev, MII_ESTATUS);

                if (val < 0)

                        return val;

                if (val & ESTATUS_1000_TFULL)

                        features |= SUPPORTED_1000baseT_Full;

                if (val & ESTATUS_1000_THALF)

                        features |= SUPPORTED_1000baseT_Half;

        }

        phydev->supported = features;

        phydev->advertising = features;

        return 0;

}

/**

 * phy_probe - probe and init a PHY device

 * @dev: device to probe and init

 *

 * Description: Take care of setting up the phy_device structure,

 *   set the state to READY (the driver's init function should

 *   set it to STARTING if needed).

 */

static int phy_probe(struct device *dev)

{

        struct phy_device *phydev;

        struct phy_driver *phydrv;

        struct device_driver *drv;

        int err = 0;

        phydev = to_phy_device(dev);

        /* Make sure the driver is held.

         * XXX -- Is this correct? */

        drv = get_driver(phydev->dev.driver);

        phydrv = to_phy_driver(drv);

        phydev->drv = phydrv;

        /* Disable the interrupt if the PHY doesn't support it */

        if (!(phydrv->flags & PHY_HAS_INTERRUPT))

                phydev->irq = PHY_POLL;

        spin_lock_bh(&phydev->lock);

        /* Start out supporting everything. Eventually,

         * a controller will attach, and may modify one

         * or both of these values */

        phydev->supported = phydrv->features;

        phydev->advertising = phydrv->features;

        /* Set the state to READY by default */

        phydev->state = PHY_READY;

        if (phydev->drv->probe)

                err = phydev->drv->probe(phydev);

        spin_unlock_bh(&phydev->lock);

        return err;

}

static int phy_remove(struct device *dev)

{

        struct phy_device *phydev;

        phydev = to_phy_device(dev);

        spin_lock_bh(&phydev->lock);

        phydev->state = PHY_DOWN;

        spin_unlock_bh(&phydev->lock);

        if (phydev->drv->remove)

                phydev->drv->remove(phydev);

        put_driver(dev->driver);

        phydev->drv = NULL;

        return 0;

}

/**

 * phy_driver_register - register a phy_driver with the PHY layer

 * @new_driver: new phy_driver to register

 */

int phy_driver_register(struct phy_driver *new_driver)

{

        int retval;

        memset(&new_driver->driver, 0, sizeof(new_driver->driver));

        new_driver->driver.name = new_driver->name;

        new_driver->driver.bus = &mdio_bus_type;

        new_driver->driver.probe = phy_probe;

        new_driver->driver.remove = phy_remove;

        retval = driver_register(&new_driver->driver);

        if (retval) {

                printk(KERN_ERR "%s: Error %d in registering driver\n",

                                new_driver->name, retval);

                return retval;

        }

        pr_debug("%s: Registered new driver\n", new_driver->name);

        return 0;

}

EXPORT_SYMBOL(phy_driver_register);