PHY: remove rwsem use from phy core

[linux-2.6/verdex.git] / drivers / net / phy / phy_device.c

/*
 * 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);

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->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
 *
 * 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:
 *
 * 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:
 *
 * 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);

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);

/* phy_attach:
 *
 *   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.
 */
static int phy_compare_id(struct device *dev, void *data)
{
        return strcmp((char *)data, dev->bus_id) ? 0 : 1;
}

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);

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
 *
 * 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
 *
 * 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 = BMCR_RESET;

        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;
}


/* Enable and Restart Autonegotiation */
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
 *
 * 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
 *
 * 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
 *
 * 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
 *
 * 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(&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(&phydev->lock);

        return err;

}

static int phy_remove(struct device *dev)
{
        struct phy_device *phydev;

        phydev = to_phy_device(dev);

        spin_lock(&phydev->lock);
        phydev->state = PHY_DOWN;
        spin_unlock(&phydev->lock);

        if (phydev->drv->remove)
                phydev->drv->remove(phydev);

        put_driver(dev->driver);
        phydev->drv = NULL;

        return 0;
}

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

        return 0;
}
EXPORT_SYMBOL(phy_driver_register);

void phy_driver_unregister(struct phy_driver *drv)
{
        driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(phy_driver_unregister);

static struct phy_driver genphy_driver = {
        .phy_id         = 0xffffffff,
        .phy_id_mask    = 0xffffffff,
        .name           = "Generic PHY",
        .config_init    = genphy_config_init,
        .features       = 0,
        .config_aneg    = genphy_config_aneg,
        .read_status    = genphy_read_status,
        .driver         = {.owner= THIS_MODULE, },
};

static int __init phy_init(void)
{
        int rc;

        rc = mdio_bus_init();
        if (rc)
                return rc;

        rc = phy_driver_register(&genphy_driver);
        if (rc)
                mdio_bus_exit();

        return rc;
}

static void __exit phy_exit(void)
{
        phy_driver_unregister(&genphy_driver);
        mdio_bus_exit();
}

subsys_initcall(phy_init);
module_exit(phy_exit);