[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/config.h>
#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/version.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>

static int genphy_config_init(struct phy_device *phydev);

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, },
};

/* 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;

	/* Otherwise, we allocate the device, and initialize the
	 * default values */
	dev = kcalloc(1, sizeof(*dev), GFP_KERNEL);

	if (NULL == dev)
		return ERR_PTR(-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;
}

/* 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;
}

/* 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
 */
static 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;
}

/* 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)
{
	u32 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 int __init phy_init(void)
{
	int rc;
	extern int mdio_bus_init(void);

	rc = phy_driver_register(&genphy_driver);
	if (rc)
		goto out;

	rc = mdio_bus_init();
	if (rc)
		goto out_unreg;

	return 0;

out_unreg:
	phy_driver_unregister(&genphy_driver);
out:
	return rc;
}

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

module_init(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	*/
	17	#include <linux/config.h>
	18	#include <linux/kernel.h>
	19	#include <linux/sched.h>
	20	#include <linux/string.h>
	21	#include <linux/errno.h>
	22	#include <linux/unistd.h>
	23	#include <linux/slab.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/init.h>
	26	#include <linux/delay.h>
	27	#include <linux/netdevice.h>
	28	#include <linux/etherdevice.h>
	29	#include <linux/skbuff.h>
	30	#include <linux/spinlock.h>
	31	#include <linux/mm.h>
	32	#include <linux/module.h>
	33	#include <linux/version.h>
	34	#include <linux/mii.h>
	35	#include <linux/ethtool.h>
	36	#include <linux/phy.h>
	37
	38	#include <asm/io.h>
	39	#include <asm/irq.h>
	40	#include <asm/uaccess.h>
	41
67c4f3fa JG	42	static int genphy_config_init(struct phy_device *phydev);
	43
	44	static struct phy_driver genphy_driver = {
	45	.phy_id = 0xffffffff,
	46	.phy_id_mask = 0xffffffff,
	47	.name = "Generic PHY",
	48	.config_init = genphy_config_init,
	49	.features = 0,
	50	.config_aneg = genphy_config_aneg,
	51	.read_status = genphy_read_status,
	52	.driver = {.owner = THIS_MODULE, },
	53	};
	54
00db8189 AF	55	/* get_phy_device
	56	*
	57	* description: Reads the ID registers of the PHY at addr on the
	58	* bus, then allocates and returns the phy_device to
	59	* represent it.
	60	*/
	61	struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
	62	{
	63	int phy_reg;
	64	u32 phy_id;
	65	struct phy_device *dev = NULL;
	66
	67	/* Grab the bits from PHYIR1, and put them
	68	* in the upper half */
	69	phy_reg = bus->read(bus, addr, MII_PHYSID1);
	70
	71	if (phy_reg < 0)
	72	return ERR_PTR(phy_reg);
	73
	74	phy_id = (phy_reg & 0xffff) << 16;
	75
	76	/* Grab the bits from PHYIR2, and put them in the lower half */
	77	phy_reg = bus->read(bus, addr, MII_PHYSID2);
	78
	79	if (phy_reg < 0)
	80	return ERR_PTR(phy_reg);
	81
	82	phy_id \|= (phy_reg & 0xffff);
	83
	84	/* If the phy_id is all Fs, there is no device there */
	85	if (0xffffffff == phy_id)
	86	return NULL;
	87
	88	/* Otherwise, we allocate the device, and initialize the
	89	* default values */
	90	dev = kcalloc(1, sizeof(*dev), GFP_KERNEL);
	91
	92	if (NULL == dev)
	93	return ERR_PTR(-ENOMEM);
	94
	95	dev->speed = 0;
	96	dev->duplex = -1;
	97	dev->pause = dev->asym_pause = 0;
	98	dev->link = 1;
	99
	100	dev->autoneg = AUTONEG_ENABLE;
	101
	102	dev->addr = addr;
	103	dev->phy_id = phy_id;
	104	dev->bus = bus;
	105
	106	dev->state = PHY_DOWN;
	107
	108	spin_lock_init(&dev->lock);
	109
	110	return dev;
	111	}
	112
	113	/* phy_prepare_link:
	114	*
	115	* description: Tells the PHY infrastructure to handle the
	116	* gory details on monitoring link status (whether through
	117	* polling or an interrupt), and to call back to the
	118	* connected device driver when the link status changes.
119	* If you want to monitor your own link state, don't call
120	* this function */
121	void phy_prepare_link(struct phy_device *phydev,
122	void (handler)(struct net_device ))
123	{
124	phydev->adjust_link = handler;
125	}
126
00db8189 AF	127	/* Generic PHY support and helper functions */
	128
	129	/* genphy_config_advert
	130	*
	131	* description: Writes MII_ADVERTISE with the appropriate values,
	132	* after sanitizing the values to make sure we only advertise
	133	* what is supported
	134	*/
2bf69b5f	135	static int genphy_config_advert(struct phy_device *phydev)
00db8189 AF	136	{
	137	u32 advertise;
	138	int adv;
	139	int err;
	140
	141	/* Only allow advertising what
	142	* this PHY supports */
	143	phydev->advertising &= phydev->supported;
	144	advertise = phydev->advertising;
	145
	146	/* Setup standard advertisement */
	147	adv = phy_read(phydev, MII_ADVERTISE);
	148
	149	if (adv < 0)
	150	return adv;
	151
	152	adv &= ~(ADVERTISE_ALL \| ADVERTISE_100BASE4 \| ADVERTISE_PAUSE_CAP \|
	153	ADVERTISE_PAUSE_ASYM);
	154	if (advertise & ADVERTISED_10baseT_Half)
	155	adv \|= ADVERTISE_10HALF;
	156	if (advertise & ADVERTISED_10baseT_Full)
	157	adv \|= ADVERTISE_10FULL;
	158	if (advertise & ADVERTISED_100baseT_Half)
	159	adv \|= ADVERTISE_100HALF;
	160	if (advertise & ADVERTISED_100baseT_Full)
	161	adv \|= ADVERTISE_100FULL;
	162	if (advertise & ADVERTISED_Pause)
	163	adv \|= ADVERTISE_PAUSE_CAP;
	164	if (advertise & ADVERTISED_Asym_Pause)
	165	adv \|= ADVERTISE_PAUSE_ASYM;
	166
	167	err = phy_write(phydev, MII_ADVERTISE, adv);
	168
	169	if (err < 0)
	170	return err;
	171
	172	/* Configure gigabit if it's supported */
	173	if (phydev->supported & (SUPPORTED_1000baseT_Half \|
	174	SUPPORTED_1000baseT_Full)) {
	175	adv = phy_read(phydev, MII_CTRL1000);
	176
	177	if (adv < 0)
	178	return adv;
	179
	180	adv &= ~(ADVERTISE_1000FULL \| ADVERTISE_1000HALF);
	181	if (advertise & SUPPORTED_1000baseT_Half)
	182	adv \|= ADVERTISE_1000HALF;
	183	if (advertise & SUPPORTED_1000baseT_Full)
	184	adv \|= ADVERTISE_1000FULL;
	185	err = phy_write(phydev, MII_CTRL1000, adv);
	186
	187	if (err < 0)
	188	return err;
	189	}
	190
	191	return adv;
	192	}
00db8189 AF	193
	194	/* genphy_setup_forced
	195	*
	196	* description: Configures MII_BMCR to force speed/duplex
	197	* to the values in phydev. Assumes that the values are valid.
	198	* Please see phy_sanitize_settings() */
	199	int genphy_setup_forced(struct phy_device *phydev)
	200	{
	201	int ctl = BMCR_RESET;
	202
	203	phydev->pause = phydev->asym_pause = 0;
	204
	205	if (SPEED_1000 == phydev->speed)
	206	ctl \|= BMCR_SPEED1000;
	207	else if (SPEED_100 == phydev->speed)
	208	ctl \|= BMCR_SPEED100;
	209
	210	if (DUPLEX_FULL == phydev->duplex)
	211	ctl \|= BMCR_FULLDPLX;
	212
	213	ctl = phy_write(phydev, MII_BMCR, ctl);
	214
	215	if (ctl < 0)
	216	return ctl;
	217
	218	/* We just reset the device, so we'd better configure any
	219	* settings the PHY requires to operate */
	220	if (phydev->drv->config_init)
	221	ctl = phydev->drv->config_init(phydev);
	222
	223	return ctl;
	224	}
	225
	226
	227	/* Enable and Restart Autonegotiation */
	228	int genphy_restart_aneg(struct phy_device *phydev)
	229	{
	230	int ctl;
	231
	232	ctl = phy_read(phydev, MII_BMCR);
	233
	234	if (ctl < 0)
	235	return ctl;
	236
	237	ctl \|= (BMCR_ANENABLE \| BMCR_ANRESTART);
	238
	239	/* Don't isolate the PHY if we're negotiating */
	240	ctl &= ~(BMCR_ISOLATE);
	241
	242	ctl = phy_write(phydev, MII_BMCR, ctl);
	243
	244	return ctl;
	245	}
	246
	247
	248	/* genphy_config_aneg
	249	*
	250	* description: If auto-negotiation is enabled, we configure the
	251	* advertising, and then restart auto-negotiation. If it is not
	252	* enabled, then we write the BMCR
	253	*/
	254	int genphy_config_aneg(struct phy_device *phydev)
	255	{
	256	int err = 0;
257
258	if (AUTONEG_ENABLE == phydev->autoneg) {
259	err = genphy_config_advert(phydev);
260
261	if (err < 0)
262	return err;
263
264	err = genphy_restart_aneg(phydev);
265	} else
266	err = genphy_setup_forced(phydev);
267
268	return err;
269	}
270	EXPORT_SYMBOL(genphy_config_aneg);
271
272	/* genphy_update_link
273	*
274	* description: Update the value in phydev->link to reflect the
275	* current link value. In order to do this, we need to read
276	* the status register twice, keeping the second value
277	*/
278	int genphy_update_link(struct phy_device *phydev)
279	{
280	int status;
281
282	/* Do a fake read */
283	status = phy_read(phydev, MII_BMSR);
284
285	if (status < 0)
286	return status;
287
288	/* Read link and autonegotiation status */
289	status = phy_read(phydev, MII_BMSR);
290
291	if (status < 0)
292	return status;
293
294	if ((status & BMSR_LSTATUS) == 0)
295	phydev->link = 0;
296	else
297	phydev->link = 1;
298
299	return 0;
300	}
301
302	/* genphy_read_status
303	*
304	* description: Check the link, then figure out the current state
305	* by comparing what we advertise with what the link partner
306	* advertises. Start by checking the gigabit possibilities,
307	* then move on to 10/100.
308	*/
309	int genphy_read_status(struct phy_device *phydev)
310	{
311	int adv;
312	int err;
313	int lpa;
314	int lpagb = 0;
315
316	/* Update the link, but return if there
317	* was an error */
318	err = genphy_update_link(phydev);
319	if (err)
320	return err;
321
322	if (AUTONEG_ENABLE == phydev->autoneg) {
323	if (phydev->supported & (SUPPORTED_1000baseT_Half
324	\| SUPPORTED_1000baseT_Full)) {
325	lpagb = phy_read(phydev, MII_STAT1000);
326
327	if (lpagb < 0)
328	return lpagb;
329
330	adv = phy_read(phydev, MII_CTRL1000);
331
332	if (adv < 0)
333	return adv;
334
335	lpagb &= adv << 2;
336	}
337
338	lpa = phy_read(phydev, MII_LPA);
339
340	if (lpa < 0)
341	return lpa;
342
343	adv = phy_read(phydev, MII_ADVERTISE);
344
345	if (adv < 0)
346	return adv;
347
348	lpa &= adv;
349
350	phydev->speed = SPEED_10;
351	phydev->duplex = DUPLEX_HALF;
352	phydev->pause = phydev->asym_pause = 0;
353
354	if (lpagb & (LPA_1000FULL \| LPA_1000HALF)) {
355	phydev->speed = SPEED_1000;
356
357	if (lpagb & LPA_1000FULL)
358	phydev->duplex = DUPLEX_FULL;
359	} else if (lpa & (LPA_100FULL \| LPA_100HALF)) {
360	phydev->speed = SPEED_100;
361
362	if (lpa & LPA_100FULL)
363	phydev->duplex = DUPLEX_FULL;
364	} else
365	if (lpa & LPA_10FULL)
366	phydev->duplex = DUPLEX_FULL;
367
368	if (phydev->duplex == DUPLEX_FULL){
369	phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
370	phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
371	}
372	} else {
373	int bmcr = phy_read(phydev, MII_BMCR);
374	if (bmcr < 0)
375	return bmcr;
376
377	if (bmcr & BMCR_FULLDPLX)
378	phydev->duplex = DUPLEX_FULL;
379	else
380	phydev->duplex = DUPLEX_HALF;
381
382	if (bmcr & BMCR_SPEED1000)
383	phydev->speed = SPEED_1000;
384	else if (bmcr & BMCR_SPEED100)
385	phydev->speed = SPEED_100;
386	else
387	phydev->speed = SPEED_10;
388
389	phydev->pause = phydev->asym_pause = 0;
390	}
391
392	return 0;
393	}
394	EXPORT_SYMBOL(genphy_read_status);
395
396	static int genphy_config_init(struct phy_device *phydev)
397	{
398	u32 val;
399	u32 features;
400
401	/* For now, I'll claim that the generic driver supports
402	* all possible port types */
403	features = (SUPPORTED_TP \| SUPPORTED_MII
404	\| SUPPORTED_AUI \| SUPPORTED_FIBRE \|
405	SUPPORTED_BNC);
406
407	/* Do we support autonegotiation? */
408	val = phy_read(phydev, MII_BMSR);
409
410	if (val < 0)
411	return val;
412
413	if (val & BMSR_ANEGCAPABLE)
414	features \|= SUPPORTED_Autoneg;
415
416	if (val & BMSR_100FULL)
417	features \|= SUPPORTED_100baseT_Full;
418	if (val & BMSR_100HALF)
419	features \|= SUPPORTED_100baseT_Half;
420	if (val & BMSR_10FULL)
421	features \|= SUPPORTED_10baseT_Full;
422	if (val & BMSR_10HALF)
423	features \|= SUPPORTED_10baseT_Half;
424
425	if (val & BMSR_ESTATEN) {
426	val = phy_read(phydev, MII_ESTATUS);
427
428	if (val < 0)
429	return val;
430
431	if (val & ESTATUS_1000_TFULL)
432	features \|= SUPPORTED_1000baseT_Full;
433	if (val & ESTATUS_1000_THALF)
434	features \|= SUPPORTED_1000baseT_Half;
435	}
436
437	phydev->supported = features;
438	phydev->advertising = features;
439
440	return 0;
441	}
442
443
444	/* phy_probe
445	*
446	* description: Take care of setting up the phy_device structure,
447	* set the state to READY (the driver's init function should
448	* set it to STARTING if needed).
449	*/
450	static int phy_probe(struct device *dev)
451	{
452	struct phy_device *phydev;
453	struct phy_driver *phydrv;
454	struct device_driver *drv;
455	int err = 0;
456
457	phydev = to_phy_device(dev);
458
459	/* Make sure the driver is held.
460	* XXX -- Is this correct? */
461	drv = get_driver(phydev->dev.driver);
462	phydrv = to_phy_driver(drv);
463	phydev->drv = phydrv;
464
465	/* Disable the interrupt if the PHY doesn't support it */
466	if (!(phydrv->flags & PHY_HAS_INTERRUPT))
467	phydev->irq = PHY_POLL;
468
469	spin_lock(&phydev->lock);
470
471	/* Start out supporting everything. Eventually,
472	* a controller will attach, and may modify one
473	* or both of these values */
474	phydev->supported = phydrv->features;
475	phydev->advertising = phydrv->features;
476
477	/* Set the state to READY by default */
478	phydev->state = PHY_READY;
479
480	if (phydev->drv->probe)
481	err = phydev->drv->probe(phydev);
482
483	spin_unlock(&phydev->lock);
484
485	if (err < 0)
486	return err;
487
488	if (phydev->drv->config_init)
489	err = phydev->drv->config_init(phydev);
490
491	return err;
492	}
493
494	static int phy_remove(struct device *dev)
495	{
496	struct phy_device *phydev;
497
498	phydev = to_phy_device(dev);
499
500	spin_lock(&phydev->lock);
501	phydev->state = PHY_DOWN;
502	spin_unlock(&phydev->lock);
503
504	if (phydev->drv->remove)
505	phydev->drv->remove(phydev);
506
507	put_driver(dev->driver);
508	phydev->drv = NULL;
509
510	return 0;
511	}
512
513	int phy_driver_register(struct phy_driver *new_driver)
514	{
515	int retval;
516
517	memset(&new_driver->driver, 0, sizeof(new_driver->driver));
518	new_driver->driver.name = new_driver->name;
519	new_driver->driver.bus = &mdio_bus_type;
520	new_driver->driver.probe = phy_probe;
521	new_driver->driver.remove = phy_remove;
522
523	retval = driver_register(&new_driver->driver);
524
525	if (retval) {
526	printk(KERN_ERR "%s: Error %d in registering driver\n",
527	new_driver->name, retval);
528
529	return retval;
530	}
531
532	pr_info("%s: Registered new driver\n", new_driver->name);
533
534	return 0;
535	}
536	EXPORT_SYMBOL(phy_driver_register);
537
538	void phy_driver_unregister(struct phy_driver *drv)
539	{
540	driver_unregister(&drv->driver);
541	}
542	EXPORT_SYMBOL(phy_driver_unregister);
543
00db8189	544
67c4f3fa	545	static int __init phy_init(void)
00db8189	546	{
67c4f3fa JG	547	int rc;
	548	extern int mdio_bus_init(void);
	549
	550	rc = phy_driver_register(&genphy_driver);
	551	if (rc)
	552	goto out;
	553
	554	rc = mdio_bus_init();
	555	if (rc)
	556	goto out_unreg;
00db8189	557
67c4f3fa JG	558	return 0;
	559
	560	out_unreg:
	561	phy_driver_unregister(&genphy_driver);
	562	out:
	563	return rc;
00db8189 AF	564	}
00db8189 AF	565
67c4f3fa	566	static void __exit phy_exit(void)
00db8189 AF	567	{
	568	phy_driver_unregister(&genphy_driver);
	569	}
	570
67c4f3fa JG	571	module_init(phy_init);
67c4f3fa JG	572	module_exit(phy_exit);