[deliverable/linux.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/sched.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 = kcalloc(1, 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->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)
{
	struct phy_device *phydev;

	phydev = phy_attach(dev, phy_id, flags);

	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)
{
	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;
		down_write(&d->bus->subsys.rwsem);
		d->driver = &genphy_driver.driver;

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

		if (err < 0)
			return ERR_PTR(err);

		device_bind_driver(d);
		up_write(&d->bus->subsys.rwsem);
	}

	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;

	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) {
		down_write(&phydev->dev.bus->subsys.rwsem);
		device_release_driver(&phydev->dev);
		up_write(&phydev->dev.bus->subsys.rwsem);
	}
}
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;
}

/* 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);

	if (err < 0)
		return err;

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

	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);
Commit	Line	Data
00db8189 AF	1	/*
	2	* drivers/net/phy/phy_device.c
	3	*
	4	* Framework for finding and configuring PHYs.
	5	* Also contains generic PHY driver
	6	*
	7	* Author: Andy Fleming
	8	*
	9	* Copyright (c) 2004 Freescale Semiconductor, Inc.
	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
	15	*
	16	*/
00db8189 AF	17	#include <linux/kernel.h>
	18	#include <linux/sched.h>
	19	#include <linux/string.h>
	20	#include <linux/errno.h>
	21	#include <linux/unistd.h>
	22	#include <linux/slab.h>
	23	#include <linux/interrupt.h>
	24	#include <linux/init.h>
	25	#include <linux/delay.h>
	26	#include <linux/netdevice.h>
	27	#include <linux/etherdevice.h>
	28	#include <linux/skbuff.h>
	29	#include <linux/spinlock.h>
	30	#include <linux/mm.h>
	31	#include <linux/module.h>
00db8189 AF	32	#include <linux/mii.h>
	33	#include <linux/ethtool.h>
	34	#include <linux/phy.h>
	35
	36	#include <asm/io.h>
	37	#include <asm/irq.h>
	38	#include <asm/uaccess.h>
	39
afcceaa3 OH	40	MODULE_DESCRIPTION("PHY library");
	41	MODULE_AUTHOR("Andy Fleming");
	42	MODULE_LICENSE("GPL");
	43
e1393456 AF	44	static struct phy_driver genphy_driver;
	45	extern int mdio_bus_init(void);
	46	extern void mdio_bus_exit(void);
67c4f3fa	47
11b0bacd VB	48	struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id)
	49	{
	50	struct phy_device *dev;
	51	/* We allocate the device, and initialize the
	52	* default values */
	53	dev = kcalloc(1, sizeof(*dev), GFP_KERNEL);
	54
	55	if (NULL == dev)
	56	return (struct phy_device) PTR_ERR((void)-ENOMEM);
	57
	58	dev->speed = 0;
	59	dev->duplex = -1;
	60	dev->pause = dev->asym_pause = 0;
	61	dev->link = 1;
	62
	63	dev->autoneg = AUTONEG_ENABLE;
	64
	65	dev->addr = addr;
	66	dev->phy_id = phy_id;
	67	dev->bus = bus;
	68
	69	dev->state = PHY_DOWN;
	70
	71	spin_lock_init(&dev->lock);
	72
	73	return dev;
	74	}
	75	EXPORT_SYMBOL(phy_device_create);
	76
00db8189 AF	77	/* get_phy_device
	78	*
	79	* description: Reads the ID registers of the PHY at addr on the
	80	* bus, then allocates and returns the phy_device to
	81	* represent it.
	82	*/
	83	struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
	84	{
	85	int phy_reg;
	86	u32 phy_id;
	87	struct phy_device *dev = NULL;
	88
	89	/* Grab the bits from PHYIR1, and put them
	90	* in the upper half */
	91	phy_reg = bus->read(bus, addr, MII_PHYSID1);
	92
	93	if (phy_reg < 0)
	94	return ERR_PTR(phy_reg);
	95
	96	phy_id = (phy_reg & 0xffff) << 16;
	97
	98	/* Grab the bits from PHYIR2, and put them in the lower half */
	99	phy_reg = bus->read(bus, addr, MII_PHYSID2);
	100
	101	if (phy_reg < 0)
	102	return ERR_PTR(phy_reg);
	103
	104	phy_id \|= (phy_reg & 0xffff);
	105
	106	/* If the phy_id is all Fs, there is no device there */
	107	if (0xffffffff == phy_id)
	108	return NULL;
	109
11b0bacd	110	dev = phy_device_create(bus, addr, phy_id);
00db8189 AF	111
	112	return dev;
	113	}
	114
	115	/* phy_prepare_link:
	116	*
	117	* description: Tells the PHY infrastructure to handle the
	118	* gory details on monitoring link status (whether through
	119	* polling or an interrupt), and to call back to the
	120	* connected device driver when the link status changes.
	121	* If you want to monitor your own link state, don't call
	122	* this function */
	123	void phy_prepare_link(struct phy_device *phydev,
	124	void (handler)(struct net_device ))
	125	{
	126	phydev->adjust_link = handler;
	127	}
	128
e1393456 AF	129	/* phy_connect:
	130	*
	131	* description: Convenience function for connecting ethernet
	132	* devices to PHY devices. The default behavior is for
	133	* the PHY infrastructure to handle everything, and only notify
	134	* the connected driver when the link status changes. If you
	135	* don't want, or can't use the provided functionality, you may
	136	* choose to call only the subset of functions which provide
	137	* the desired functionality.
	138	*/
	139	struct phy_device * phy_connect(struct net_device dev, const char phy_id,
	140	void (handler)(struct net_device ), u32 flags)
	141	{
	142	struct phy_device *phydev;
	143
	144	phydev = phy_attach(dev, phy_id, flags);
	145
	146	if (IS_ERR(phydev))
	147	return phydev;
	148
	149	phy_prepare_link(phydev, handler);
	150
	151	phy_start_machine(phydev, NULL);
	152
	153	if (phydev->irq > 0)
	154	phy_start_interrupts(phydev);
	155
	156	return phydev;
	157	}
	158	EXPORT_SYMBOL(phy_connect);
	159
	160	void phy_disconnect(struct phy_device *phydev)
	161	{
	162	if (phydev->irq > 0)
	163	phy_stop_interrupts(phydev);
	164
	165	phy_stop_machine(phydev);
	166
	167	phydev->adjust_link = NULL;
	168
	169	phy_detach(phydev);
	170	}
	171	EXPORT_SYMBOL(phy_disconnect);
	172
e1393456 AF	173	/* phy_attach:
	174	*
	175	* description: Called by drivers to attach to a particular PHY
	176	* device. The phy_device is found, and properly hooked up
	177	* to the phy_driver. If no driver is attached, then the
	178	* genphy_driver is used. The phy_device is given a ptr to
	179	* the attaching device, and given a callback for link status
	180	* change. The phy_device is returned to the attaching
	181	* driver.
	182	*/
	183	static int phy_compare_id(struct device dev, void data)
	184	{
	185	return strcmp((char *)data, dev->bus_id) ? 0 : 1;
	186	}
	187
	188	struct phy_device phy_attach(struct net_device dev,
	189	const char *phy_id, u32 flags)
	190	{
	191	struct bus_type *bus = &mdio_bus_type;
	192	struct phy_device *phydev;
	193	struct device *d;
	194
	195	/* Search the list of PHY devices on the mdio bus for the
	196	* PHY with the requested name */
	197	d = bus_find_device(bus, NULL, (void *)phy_id, phy_compare_id);
	198
	199	if (d) {
	200	phydev = to_phy_device(d);
	201	} else {
	202	printk(KERN_ERR "%s not found\n", phy_id);
	203	return ERR_PTR(-ENODEV);
	204	}
	205
	206	/* Assume that if there is no driver, that it doesn't
	207	* exist, and we should use the genphy driver. */
	208	if (NULL == d->driver) {
	209	int err;
	210	down_write(&d->bus->subsys.rwsem);
	211	d->driver = &genphy_driver.driver;
	212
	213	err = d->driver->probe(d);
	214
	215	if (err < 0)
	216	return ERR_PTR(err);
	217
	218	device_bind_driver(d);
	219	up_write(&d->bus->subsys.rwsem);
	220	}
	221
	222	if (phydev->attached_dev) {
	223	printk(KERN_ERR "%s: %s already attached\n",
	224	dev->name, phy_id);
	225	return ERR_PTR(-EBUSY);
	226	}
	227
	228	phydev->attached_dev = dev;
	229
	230	phydev->dev_flags = flags;
	231
	232	return phydev;
	233	}
	234	EXPORT_SYMBOL(phy_attach);
	235
	236	void phy_detach(struct phy_device *phydev)
237	{
238	phydev->attached_dev = NULL;
239
240	/* If the device had no specific driver before (i.e. - it
241	* was using the generic driver), we unbind the device
242	* from the generic driver so that there's a chance a
243	* real driver could be loaded */
244	if (phydev->dev.driver == &genphy_driver.driver) {
245	down_write(&phydev->dev.bus->subsys.rwsem);
246	device_release_driver(&phydev->dev);
247	up_write(&phydev->dev.bus->subsys.rwsem);
248	}
249	}
250	EXPORT_SYMBOL(phy_detach);
251
252
00db8189 AF	253	/* Generic PHY support and helper functions */
	254
	255	/* genphy_config_advert
	256	*
	257	* description: Writes MII_ADVERTISE with the appropriate values,
	258	* after sanitizing the values to make sure we only advertise
	259	* what is supported
	260	*/
e1393456	261	int genphy_config_advert(struct phy_device *phydev)
00db8189 AF	262	{
	263	u32 advertise;
	264	int adv;
	265	int err;
	266
	267	/* Only allow advertising what
	268	* this PHY supports */
	269	phydev->advertising &= phydev->supported;
	270	advertise = phydev->advertising;
	271
	272	/* Setup standard advertisement */
	273	adv = phy_read(phydev, MII_ADVERTISE);
	274
	275	if (adv < 0)
	276	return adv;
	277
	278	adv &= ~(ADVERTISE_ALL \| ADVERTISE_100BASE4 \| ADVERTISE_PAUSE_CAP \|
	279	ADVERTISE_PAUSE_ASYM);
	280	if (advertise & ADVERTISED_10baseT_Half)
	281	adv \|= ADVERTISE_10HALF;
	282	if (advertise & ADVERTISED_10baseT_Full)
	283	adv \|= ADVERTISE_10FULL;
	284	if (advertise & ADVERTISED_100baseT_Half)
	285	adv \|= ADVERTISE_100HALF;
	286	if (advertise & ADVERTISED_100baseT_Full)
	287	adv \|= ADVERTISE_100FULL;
	288	if (advertise & ADVERTISED_Pause)
	289	adv \|= ADVERTISE_PAUSE_CAP;
	290	if (advertise & ADVERTISED_Asym_Pause)
	291	adv \|= ADVERTISE_PAUSE_ASYM;
	292
	293	err = phy_write(phydev, MII_ADVERTISE, adv);
	294
	295	if (err < 0)
	296	return err;
	297
	298	/* Configure gigabit if it's supported */
	299	if (phydev->supported & (SUPPORTED_1000baseT_Half \|
	300	SUPPORTED_1000baseT_Full)) {
	301	adv = phy_read(phydev, MII_CTRL1000);
	302
	303	if (adv < 0)
	304	return adv;
	305
	306	adv &= ~(ADVERTISE_1000FULL \| ADVERTISE_1000HALF);
	307	if (advertise & SUPPORTED_1000baseT_Half)
	308	adv \|= ADVERTISE_1000HALF;
	309	if (advertise & SUPPORTED_1000baseT_Full)
	310	adv \|= ADVERTISE_1000FULL;
	311	err = phy_write(phydev, MII_CTRL1000, adv);
	312
	313	if (err < 0)
	314	return err;
	315	}
	316
	317	return adv;
	318	}
e1393456	319	EXPORT_SYMBOL(genphy_config_advert);
00db8189 AF	320
	321	/* genphy_setup_forced
	322	*
	323	* description: Configures MII_BMCR to force speed/duplex
	324	* to the values in phydev. Assumes that the values are valid.
	325	* Please see phy_sanitize_settings() */
	326	int genphy_setup_forced(struct phy_device *phydev)
	327	{
	328	int ctl = BMCR_RESET;
	329
	330	phydev->pause = phydev->asym_pause = 0;
	331
	332	if (SPEED_1000 == phydev->speed)
	333	ctl \|= BMCR_SPEED1000;
	334	else if (SPEED_100 == phydev->speed)
	335	ctl \|= BMCR_SPEED100;
	336
	337	if (DUPLEX_FULL == phydev->duplex)
	338	ctl \|= BMCR_FULLDPLX;
	339
	340	ctl = phy_write(phydev, MII_BMCR, ctl);
	341
	342	if (ctl < 0)
	343	return ctl;
	344
	345	/* We just reset the device, so we'd better configure any
	346	* settings the PHY requires to operate */
	347	if (phydev->drv->config_init)
	348	ctl = phydev->drv->config_init(phydev);
	349
	350	return ctl;
	351	}
	352
	353
	354	/* Enable and Restart Autonegotiation */
	355	int genphy_restart_aneg(struct phy_device *phydev)
	356	{
	357	int ctl;
	358
	359	ctl = phy_read(phydev, MII_BMCR);
	360
	361	if (ctl < 0)
	362	return ctl;
	363
	364	ctl \|= (BMCR_ANENABLE \| BMCR_ANRESTART);
	365
	366	/* Don't isolate the PHY if we're negotiating */
	367	ctl &= ~(BMCR_ISOLATE);
	368
	369	ctl = phy_write(phydev, MII_BMCR, ctl);
	370
	371	return ctl;
	372	}
	373
	374
	375	/* genphy_config_aneg
	376	*
	377	* description: If auto-negotiation is enabled, we configure the
	378	* advertising, and then restart auto-negotiation. If it is not
	379	* enabled, then we write the BMCR
	380	*/
	381	int genphy_config_aneg(struct phy_device *phydev)
	382	{
	383	int err = 0;
384
385	if (AUTONEG_ENABLE == phydev->autoneg) {
386	err = genphy_config_advert(phydev);
387
388	if (err < 0)
389	return err;
390
391	err = genphy_restart_aneg(phydev);
392	} else
393	err = genphy_setup_forced(phydev);
394
395	return err;
396	}
397	EXPORT_SYMBOL(genphy_config_aneg);
398
399	/* genphy_update_link
400	*
401	* description: Update the value in phydev->link to reflect the
402	* current link value. In order to do this, we need to read
403	* the status register twice, keeping the second value
404	*/
405	int genphy_update_link(struct phy_device *phydev)
406	{
407	int status;
408
409	/* Do a fake read */
410	status = phy_read(phydev, MII_BMSR);
411
412	if (status < 0)
413	return status;
414
415	/* Read link and autonegotiation status */
416	status = phy_read(phydev, MII_BMSR);
417
418	if (status < 0)
419	return status;
420
421	if ((status & BMSR_LSTATUS) == 0)
422	phydev->link = 0;
423	else
424	phydev->link = 1;
425
426	return 0;
427	}
428
429	/* genphy_read_status
430	*
431	* description: Check the link, then figure out the current state
432	* by comparing what we advertise with what the link partner
433	* advertises. Start by checking the gigabit possibilities,
434	* then move on to 10/100.
435	*/
436	int genphy_read_status(struct phy_device *phydev)
437	{
438	int adv;
439	int err;
440	int lpa;
441	int lpagb = 0;
442
443	/* Update the link, but return if there
444	* was an error */
445	err = genphy_update_link(phydev);
446	if (err)
447	return err;
448
449	if (AUTONEG_ENABLE == phydev->autoneg) {
450	if (phydev->supported & (SUPPORTED_1000baseT_Half
451	\| SUPPORTED_1000baseT_Full)) {
452	lpagb = phy_read(phydev, MII_STAT1000);
453
454	if (lpagb < 0)
455	return lpagb;
456
457	adv = phy_read(phydev, MII_CTRL1000);
458
459	if (adv < 0)
460	return adv;
461
462	lpagb &= adv << 2;
463	}
464
465	lpa = phy_read(phydev, MII_LPA);
466
467	if (lpa < 0)
468	return lpa;
469
470	adv = phy_read(phydev, MII_ADVERTISE);
471
472	if (adv < 0)
473	return adv;
474
475	lpa &= adv;
476
477	phydev->speed = SPEED_10;
478	phydev->duplex = DUPLEX_HALF;
479	phydev->pause = phydev->asym_pause = 0;
480
481	if (lpagb & (LPA_1000FULL \| LPA_1000HALF)) {
482	phydev->speed = SPEED_1000;
483
484	if (lpagb & LPA_1000FULL)
485	phydev->duplex = DUPLEX_FULL;
486	} else if (lpa & (LPA_100FULL \| LPA_100HALF)) {
487	phydev->speed = SPEED_100;
488
489	if (lpa & LPA_100FULL)
490	phydev->duplex = DUPLEX_FULL;
491	} else
492	if (lpa & LPA_10FULL)
493	phydev->duplex = DUPLEX_FULL;
494
495	if (phydev->duplex == DUPLEX_FULL){
496	phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
497	phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
498	}
499	} else {
500	int bmcr = phy_read(phydev, MII_BMCR);
501	if (bmcr < 0)
502	return bmcr;
503
504	if (bmcr & BMCR_FULLDPLX)
505	phydev->duplex = DUPLEX_FULL;
506	else
507	phydev->duplex = DUPLEX_HALF;
508
509	if (bmcr & BMCR_SPEED1000)
510	phydev->speed = SPEED_1000;
511	else if (bmcr & BMCR_SPEED100)
512	phydev->speed = SPEED_100;
513	else
514	phydev->speed = SPEED_10;
515
516	phydev->pause = phydev->asym_pause = 0;
517	}
518
519	return 0;
520	}
521	EXPORT_SYMBOL(genphy_read_status);
522
523	static int genphy_config_init(struct phy_device *phydev)
524	{
84c22d79	525	int val;
00db8189 AF	526	u32 features;
	527
	528	/* For now, I'll claim that the generic driver supports
	529	* all possible port types */
	530	features = (SUPPORTED_TP \| SUPPORTED_MII
	531	\| SUPPORTED_AUI \| SUPPORTED_FIBRE \|
	532	SUPPORTED_BNC);
	533
	534	/* Do we support autonegotiation? */
	535	val = phy_read(phydev, MII_BMSR);
	536
	537	if (val < 0)
	538	return val;
	539
	540	if (val & BMSR_ANEGCAPABLE)
	541	features \|= SUPPORTED_Autoneg;
	542
	543	if (val & BMSR_100FULL)
	544	features \|= SUPPORTED_100baseT_Full;
	545	if (val & BMSR_100HALF)
	546	features \|= SUPPORTED_100baseT_Half;
	547	if (val & BMSR_10FULL)
	548	features \|= SUPPORTED_10baseT_Full;
	549	if (val & BMSR_10HALF)
	550	features \|= SUPPORTED_10baseT_Half;
	551
	552	if (val & BMSR_ESTATEN) {
	553	val = phy_read(phydev, MII_ESTATUS);
	554
	555	if (val < 0)
	556	return val;
	557
	558	if (val & ESTATUS_1000_TFULL)
	559	features \|= SUPPORTED_1000baseT_Full;
	560	if (val & ESTATUS_1000_THALF)
	561	features \|= SUPPORTED_1000baseT_Half;
	562	}
	563
	564	phydev->supported = features;
	565	phydev->advertising = features;
	566
	567	return 0;
	568	}
	569
	570
	571	/* phy_probe
	572	*
	573	* description: Take care of setting up the phy_device structure,
	574	* set the state to READY (the driver's init function should
	575	* set it to STARTING if needed).
	576	*/
	577	static int phy_probe(struct device *dev)
	578	{
	579	struct phy_device *phydev;
	580	struct phy_driver *phydrv;
	581	struct device_driver *drv;
	582	int err = 0;
	583
	584	phydev = to_phy_device(dev);
	585
	586	/* Make sure the driver is held.
	587	* XXX -- Is this correct? */
	588	drv = get_driver(phydev->dev.driver);
	589	phydrv = to_phy_driver(drv);
590	phydev->drv = phydrv;
591
592	/* Disable the interrupt if the PHY doesn't support it */
593	if (!(phydrv->flags & PHY_HAS_INTERRUPT))
594	phydev->irq = PHY_POLL;
595
596	spin_lock(&phydev->lock);
597
598	/* Start out supporting everything. Eventually,
599	* a controller will attach, and may modify one
600	* or both of these values */
601	phydev->supported = phydrv->features;
602	phydev->advertising = phydrv->features;
603
604	/* Set the state to READY by default */
605	phydev->state = PHY_READY;
606
607	if (phydev->drv->probe)
608	err = phydev->drv->probe(phydev);
609
610	spin_unlock(&phydev->lock);
611
612	if (err < 0)
613	return err;
614
615	if (phydev->drv->config_init)
616	err = phydev->drv->config_init(phydev);
617
618	return err;
619	}
620
621	static int phy_remove(struct device *dev)
622	{
623	struct phy_device *phydev;
624
625	phydev = to_phy_device(dev);
626
627	spin_lock(&phydev->lock);
628	phydev->state = PHY_DOWN;
629	spin_unlock(&phydev->lock);
630
631	if (phydev->drv->remove)
632	phydev->drv->remove(phydev);
633
634	put_driver(dev->driver);
635	phydev->drv = NULL;
636
637	return 0;
638	}
639
640	int phy_driver_register(struct phy_driver *new_driver)
641	{
642	int retval;
643
644	memset(&new_driver->driver, 0, sizeof(new_driver->driver));
645	new_driver->driver.name = new_driver->name;
646	new_driver->driver.bus = &mdio_bus_type;
647	new_driver->driver.probe = phy_probe;
648	new_driver->driver.remove = phy_remove;
649
650	retval = driver_register(&new_driver->driver);
651
652	if (retval) {
653	printk(KERN_ERR "%s: Error %d in registering driver\n",
654	new_driver->name, retval);
655
656	return retval;
657	}
658
659	pr_info("%s: Registered new driver\n", new_driver->name);
660
661	return 0;
662	}
663	EXPORT_SYMBOL(phy_driver_register);
664
665	void phy_driver_unregister(struct phy_driver *drv)
666	{
667	driver_unregister(&drv->driver);
668	}
669	EXPORT_SYMBOL(phy_driver_unregister);
670
e1393456 AF	671	static struct phy_driver genphy_driver = {
	672	.phy_id = 0xffffffff,
	673	.phy_id_mask = 0xffffffff,
	674	.name = "Generic PHY",
	675	.config_init = genphy_config_init,
	676	.features = 0,
	677	.config_aneg = genphy_config_aneg,
	678	.read_status = genphy_read_status,
	679	.driver = {.owner= THIS_MODULE, },
	680	};
00db8189	681
67c4f3fa	682	static int __init phy_init(void)
00db8189	683	{
67c4f3fa	684	int rc;
67c4f3fa JG	685
	686	rc = mdio_bus_init();
	687	if (rc)
e1393456	688	return rc;
00db8189	689
e1393456 AF	690	rc = phy_driver_register(&genphy_driver);
	691	if (rc)
	692	mdio_bus_exit();
67c4f3fa	693
67c4f3fa	694	return rc;
00db8189 AF	695	}
00db8189 AF	696
67c4f3fa	697	static void __exit phy_exit(void)
00db8189 AF	698	{
00db8189 AF	699	phy_driver_unregister(&genphy_driver);
e1393456	700	mdio_bus_exit();
00db8189 AF	701	}
00db8189 AF	702
e1393456	703	subsys_initcall(phy_init);
67c4f3fa	704	module_exit(phy_exit);