[deliverable/linux.git] / drivers / net / phy / lxt.c

/*
 * drivers/net/phy/lxt.c
 *
 * Driver for Intel LXT PHYs
 *
 * 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/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>

/* The Level one LXT970 is used by many boards				     */

#define MII_LXT970_IER       17  /* Interrupt Enable Register */

#define MII_LXT970_IER_IEN	0x0002

#define MII_LXT970_ISR       18  /* Interrupt Status Register */

#define MII_LXT970_CONFIG    19  /* Configuration Register    */

/* ------------------------------------------------------------------------- */
/* The Level one LXT971 is used on some of my custom boards                  */

/* register definitions for the 971 */
#define MII_LXT971_IER		18  /* Interrupt Enable Register */
#define MII_LXT971_IER_IEN	0x00f2

#define MII_LXT971_ISR		19  /* Interrupt Status Register */

/* register definitions for the 973 */
#define MII_LXT973_PCR 16 /* Port Configuration Register */
#define PCR_FIBER_SELECT 1

MODULE_DESCRIPTION("Intel LXT PHY driver");
MODULE_AUTHOR("Andy Fleming");
MODULE_LICENSE("GPL");

static int lxt970_ack_interrupt(struct phy_device *phydev)
{
	int err;

	err = phy_read(phydev, MII_BMSR);

	if (err < 0)
		return err;

	err = phy_read(phydev, MII_LXT970_ISR);

	if (err < 0)
		return err;

	return 0;
}

static int lxt970_config_intr(struct phy_device *phydev)
{
	int err;

	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
		err = phy_write(phydev, MII_LXT970_IER, MII_LXT970_IER_IEN);
	else
		err = phy_write(phydev, MII_LXT970_IER, 0);

	return err;
}

static int lxt970_config_init(struct phy_device *phydev)
{
	int err;

	err = phy_write(phydev, MII_LXT970_CONFIG, 0);

	return err;
}


static int lxt971_ack_interrupt(struct phy_device *phydev)
{
	int err = phy_read(phydev, MII_LXT971_ISR);

	if (err < 0)
		return err;

	return 0;
}

static int lxt971_config_intr(struct phy_device *phydev)
{
	int err;

	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
		err = phy_write(phydev, MII_LXT971_IER, MII_LXT971_IER_IEN);
	else
		err = phy_write(phydev, MII_LXT971_IER, 0);

	return err;
}

/*
 * A2 version of LXT973 chip has an ERRATA: it randomly return the contents
 * of the previous even register when you read a odd register regularly
 */

static int lxt973a2_update_link(struct phy_device *phydev)
{
	int status;
	int control;
	int retry = 8; /* we try 8 times */

	/* Do a fake read */
	status = phy_read(phydev, MII_BMSR);

	if (status < 0)
		return status;

	control = phy_read(phydev, MII_BMCR);
	if (control < 0)
		return control;

	do {
		/* Read link and autonegotiation status */
		status = phy_read(phydev, MII_BMSR);
	} while (status >= 0 && retry-- && status == control);

	if (status < 0)
		return status;

	if ((status & BMSR_LSTATUS) == 0)
		phydev->link = 0;
	else
		phydev->link = 1;

	return 0;
}

static int lxt973a2_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 = lxt973a2_update_link(phydev);
	if (err)
		return err;

	if (AUTONEG_ENABLE == phydev->autoneg) {
		int retry = 1;

		adv = phy_read(phydev, MII_ADVERTISE);

		if (adv < 0)
			return adv;

		do {
			lpa = phy_read(phydev, MII_LPA);

			if (lpa < 0)
				return lpa;

			/* If both registers are equal, it is suspect but not
			* impossible, hence a new try
			*/
		} while (lpa == adv && retry--);

		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;
}

static int lxt973_probe(struct phy_device *phydev)
{
	int val = phy_read(phydev, MII_LXT973_PCR);

	if (val & PCR_FIBER_SELECT) {
		/*
		 * If fiber is selected, then the only correct setting
		 * is 100Mbps, full duplex, and auto negotiation off.
		 */
		val = phy_read(phydev, MII_BMCR);
		val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
		val &= ~BMCR_ANENABLE;
		phy_write(phydev, MII_BMCR, val);
		/* Remember that the port is in fiber mode. */
		phydev->priv = lxt973_probe;
	} else {
		phydev->priv = NULL;
	}
	return 0;
}

static int lxt973_config_aneg(struct phy_device *phydev)
{
	/* Do nothing if port is in fiber mode. */
	return phydev->priv ? 0 : genphy_config_aneg(phydev);
}

static struct phy_driver lxt97x_driver[] = {
{
	.phy_id		= 0x78100000,
	.name		= "LXT970",
	.phy_id_mask	= 0xfffffff0,
	.features	= PHY_BASIC_FEATURES,
	.flags		= PHY_HAS_INTERRUPT,
	.config_init	= lxt970_config_init,
	.config_aneg	= genphy_config_aneg,
	.read_status	= genphy_read_status,
	.ack_interrupt	= lxt970_ack_interrupt,
	.config_intr	= lxt970_config_intr,
}, {
	.phy_id		= 0x001378e0,
	.name		= "LXT971",
	.phy_id_mask	= 0xfffffff0,
	.features	= PHY_BASIC_FEATURES,
	.flags		= PHY_HAS_INTERRUPT,
	.config_aneg	= genphy_config_aneg,
	.read_status	= genphy_read_status,
	.ack_interrupt	= lxt971_ack_interrupt,
	.config_intr	= lxt971_config_intr,
}, {
	.phy_id		= 0x00137a10,
	.name		= "LXT973-A2",
	.phy_id_mask	= 0xffffffff,
	.features	= PHY_BASIC_FEATURES,
	.flags		= 0,
	.probe		= lxt973_probe,
	.config_aneg	= lxt973_config_aneg,
	.read_status	= lxt973a2_read_status,
}, {
	.phy_id		= 0x00137a10,
	.name		= "LXT973",
	.phy_id_mask	= 0xfffffff0,
	.features	= PHY_BASIC_FEATURES,
	.flags		= 0,
	.probe		= lxt973_probe,
	.config_aneg	= lxt973_config_aneg,
	.read_status	= genphy_read_status,
} };

module_phy_driver(lxt97x_driver);

static struct mdio_device_id __maybe_unused lxt_tbl[] = {
	{ 0x78100000, 0xfffffff0 },
	{ 0x001378e0, 0xfffffff0 },
	{ 0x00137a10, 0xfffffff0 },
	{ }
};

MODULE_DEVICE_TABLE(mdio, lxt_tbl);
Commit	Line	Data
00db8189 AF	1	/*
	2	* drivers/net/phy/lxt.c
	3	*
	4	* Driver for Intel LXT PHYs
	5	*
	6	* Author: Andy Fleming
	7	*
	8	* Copyright (c) 2004 Freescale Semiconductor, Inc.
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*
	15	*/
00db8189	16	#include <linux/kernel.h>
00db8189 AF	17	#include <linux/string.h>
	18	#include <linux/errno.h>
	19	#include <linux/unistd.h>
00db8189 AF	20	#include <linux/interrupt.h>
	21	#include <linux/init.h>
	22	#include <linux/delay.h>
	23	#include <linux/netdevice.h>
	24	#include <linux/etherdevice.h>
	25	#include <linux/skbuff.h>
	26	#include <linux/spinlock.h>
	27	#include <linux/mm.h>
	28	#include <linux/module.h>
00db8189 AF	29	#include <linux/mii.h>
	30	#include <linux/ethtool.h>
	31	#include <linux/phy.h>
	32
	33	#include <asm/io.h>
	34	#include <asm/irq.h>
	35	#include <asm/uaccess.h>
	36
	37	/* The Level one LXT970 is used by many boards */
	38
	39	#define MII_LXT970_IER 17 /* Interrupt Enable Register */
	40
	41	#define MII_LXT970_IER_IEN 0x0002
	42
	43	#define MII_LXT970_ISR 18 /* Interrupt Status Register */
	44
	45	#define MII_LXT970_CONFIG 19 /* Configuration Register */
	46
	47	/* ------------------------------------------------------------------------- */
	48	/* The Level one LXT971 is used on some of my custom boards */
	49
	50	/* register definitions for the 971 */
	51	#define MII_LXT971_IER 18 /* Interrupt Enable Register */
	52	#define MII_LXT971_IER_IEN 0x00f2
	53
	54	#define MII_LXT971_ISR 19 /* Interrupt Status Register */
	55
e13647c1 RC	56	/* register definitions for the 973 */
	57	#define MII_LXT973_PCR 16 /* Port Configuration Register */
	58	#define PCR_FIBER_SELECT 1
00db8189 AF	59
	60	MODULE_DESCRIPTION("Intel LXT PHY driver");
	61	MODULE_AUTHOR("Andy Fleming");
	62	MODULE_LICENSE("GPL");
	63
	64	static int lxt970_ack_interrupt(struct phy_device *phydev)
	65	{
	66	int err;
	67
	68	err = phy_read(phydev, MII_BMSR);
	69
	70	if (err < 0)
	71	return err;
	72
	73	err = phy_read(phydev, MII_LXT970_ISR);
	74
	75	if (err < 0)
	76	return err;
	77
	78	return 0;
	79	}
	80
	81	static int lxt970_config_intr(struct phy_device *phydev)
	82	{
	83	int err;
	84
5df47d5e	85	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
00db8189 AF	86	err = phy_write(phydev, MII_LXT970_IER, MII_LXT970_IER_IEN);
	87	else
	88	err = phy_write(phydev, MII_LXT970_IER, 0);
	89
	90	return err;
	91	}
	92
	93	static int lxt970_config_init(struct phy_device *phydev)
	94	{
	95	int err;
	96
	97	err = phy_write(phydev, MII_LXT970_CONFIG, 0);
	98
	99	return err;
	100	}
	101
	102
	103	static int lxt971_ack_interrupt(struct phy_device *phydev)
	104	{
	105	int err = phy_read(phydev, MII_LXT971_ISR);
	106
	107	if (err < 0)
	108	return err;
	109
	110	return 0;
	111	}
	112
	113	static int lxt971_config_intr(struct phy_device *phydev)
	114	{
	115	int err;
	116
5df47d5e	117	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
00db8189 AF	118	err = phy_write(phydev, MII_LXT971_IER, MII_LXT971_IER_IEN);
	119	else
	120	err = phy_write(phydev, MII_LXT971_IER, 0);
	121
	122	return err;
	123	}
	124
871d1d6b LC	125	/*
	126	* A2 version of LXT973 chip has an ERRATA: it randomly return the contents
	127	* of the previous even register when you read a odd register regularly
	128	*/
	129
	130	static int lxt973a2_update_link(struct phy_device *phydev)
	131	{
	132	int status;
	133	int control;
	134	int retry = 8; /* we try 8 times */
	135
	136	/* Do a fake read */
	137	status = phy_read(phydev, MII_BMSR);
	138
	139	if (status < 0)
	140	return status;
	141
	142	control = phy_read(phydev, MII_BMCR);
	143	if (control < 0)
	144	return control;
	145
	146	do {
	147	/* Read link and autonegotiation status */
	148	status = phy_read(phydev, MII_BMSR);
	149	} while (status >= 0 && retry-- && status == control);
	150
	151	if (status < 0)
	152	return status;
	153
	154	if ((status & BMSR_LSTATUS) == 0)
	155	phydev->link = 0;
	156	else
	157	phydev->link = 1;
	158
	159	return 0;
	160	}
	161
19945333	162	static int lxt973a2_read_status(struct phy_device *phydev)
871d1d6b LC	163	{
	164	int adv;
	165	int err;
	166	int lpa;
	167	int lpagb = 0;
	168
	169	/* Update the link, but return if there was an error */
	170	err = lxt973a2_update_link(phydev);
	171	if (err)
	172	return err;
	173
	174	if (AUTONEG_ENABLE == phydev->autoneg) {
	175	int retry = 1;
	176
	177	adv = phy_read(phydev, MII_ADVERTISE);
	178
	179	if (adv < 0)
	180	return adv;
	181
	182	do {
	183	lpa = phy_read(phydev, MII_LPA);
	184
	185	if (lpa < 0)
	186	return lpa;
	187
	188	/* If both registers are equal, it is suspect but not
	189	* impossible, hence a new try
	190	*/
	191	} while (lpa == adv && retry--);
	192
	193	lpa &= adv;
	194
	195	phydev->speed = SPEED_10;
	196	phydev->duplex = DUPLEX_HALF;
	197	phydev->pause = phydev->asym_pause = 0;
	198
	199	if (lpagb & (LPA_1000FULL \| LPA_1000HALF)) {
	200	phydev->speed = SPEED_1000;
	201
	202	if (lpagb & LPA_1000FULL)
	203	phydev->duplex = DUPLEX_FULL;
	204	} else if (lpa & (LPA_100FULL \| LPA_100HALF)) {
	205	phydev->speed = SPEED_100;
	206
	207	if (lpa & LPA_100FULL)
	208	phydev->duplex = DUPLEX_FULL;
	209	} else {
	210	if (lpa & LPA_10FULL)
	211	phydev->duplex = DUPLEX_FULL;
	212	}
	213
	214	if (phydev->duplex == DUPLEX_FULL) {
	215	phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
	216	phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
	217	}
	218	} else {
	219	int bmcr = phy_read(phydev, MII_BMCR);
	220
	221	if (bmcr < 0)
	222	return bmcr;
	223
	224	if (bmcr & BMCR_FULLDPLX)
	225	phydev->duplex = DUPLEX_FULL;
	226	else
227	phydev->duplex = DUPLEX_HALF;
228
229	if (bmcr & BMCR_SPEED1000)
230	phydev->speed = SPEED_1000;
231	else if (bmcr & BMCR_SPEED100)
232	phydev->speed = SPEED_100;
233	else
234	phydev->speed = SPEED_10;
235
236	phydev->pause = phydev->asym_pause = 0;
237	}
238
239	return 0;
240	}
241
e13647c1 RC	242	static int lxt973_probe(struct phy_device *phydev)
	243	{
	244	int val = phy_read(phydev, MII_LXT973_PCR);
	245
	246	if (val & PCR_FIBER_SELECT) {
	247	/*
	248	* If fiber is selected, then the only correct setting
	249	* is 100Mbps, full duplex, and auto negotiation off.
	250	*/
	251	val = phy_read(phydev, MII_BMCR);
	252	val \|= (BMCR_SPEED100 \| BMCR_FULLDPLX);
	253	val &= ~BMCR_ANENABLE;
	254	phy_write(phydev, MII_BMCR, val);
	255	/* Remember that the port is in fiber mode. */
	256	phydev->priv = lxt973_probe;
	257	} else {
	258	phydev->priv = NULL;
	259	}
	260	return 0;
	261	}
	262
	263	static int lxt973_config_aneg(struct phy_device *phydev)
	264	{
	265	/* Do nothing if port is in fiber mode. */
	266	return phydev->priv ? 0 : genphy_config_aneg(phydev);
	267	}
	268
d5bf9071 CH	269	static struct phy_driver lxt97x_driver[] = {
d5bf9071 CH	270	{
600991b0	271	.phy_id = 0x78100000,
00db8189	272	.name = "LXT970",
600991b0	273	.phy_id_mask = 0xfffffff0,
00db8189 AF	274	.features = PHY_BASIC_FEATURES,
	275	.flags = PHY_HAS_INTERRUPT,
	276	.config_init = lxt970_config_init,
	277	.config_aneg = genphy_config_aneg,
	278	.read_status = genphy_read_status,
	279	.ack_interrupt = lxt970_ack_interrupt,
	280	.config_intr = lxt970_config_intr,
d5bf9071	281	}, {
600991b0	282	.phy_id = 0x001378e0,
00db8189	283	.name = "LXT971",
600991b0	284	.phy_id_mask = 0xfffffff0,
00db8189 AF	285	.features = PHY_BASIC_FEATURES,
	286	.flags = PHY_HAS_INTERRUPT,
	287	.config_aneg = genphy_config_aneg,
	288	.read_status = genphy_read_status,
	289	.ack_interrupt = lxt971_ack_interrupt,
	290	.config_intr = lxt971_config_intr,
871d1d6b LC	291	}, {
	292	.phy_id = 0x00137a10,
	293	.name = "LXT973-A2",
	294	.phy_id_mask = 0xffffffff,
	295	.features = PHY_BASIC_FEATURES,
	296	.flags = 0,
	297	.probe = lxt973_probe,
	298	.config_aneg = lxt973_config_aneg,
	299	.read_status = lxt973a2_read_status,
d5bf9071	300	}, {
e13647c1 RC	301	.phy_id = 0x00137a10,
	302	.name = "LXT973",
	303	.phy_id_mask = 0xfffffff0,
	304	.features = PHY_BASIC_FEATURES,
	305	.flags = 0,
	306	.probe = lxt973_probe,
	307	.config_aneg = lxt973_config_aneg,
	308	.read_status = genphy_read_status,
d5bf9071	309	} };
e13647c1	310
50fd7150	311	module_phy_driver(lxt97x_driver);
4e4f10f6	312
cf93c945	313	static struct mdio_device_id __maybe_unused lxt_tbl[] = {
4e4f10f6 DW	314	{ 0x78100000, 0xfffffff0 },
4e4f10f6 DW	315	{ 0x001378e0, 0xfffffff0 },
e2f5b045	316	{ 0x00137a10, 0xfffffff0 },
4e4f10f6 DW	317	{ }
	318	};
	319
	320	MODULE_DEVICE_TABLE(mdio, lxt_tbl);