/*
* 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,
.driver = { .owner = THIS_MODULE,},
}, {
.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,
.driver = { .owner = THIS_MODULE,},
}, {
.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,
.driver = { .owner = THIS_MODULE,},
}, {
.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,
.driver = { .owner = THIS_MODULE,},
} };
static int __init lxt_init(void)
{
return phy_drivers_register(lxt97x_driver,
ARRAY_SIZE(lxt97x_driver));
}
static void __exit lxt_exit(void)
{
phy_drivers_unregister(lxt97x_driver,
ARRAY_SIZE(lxt97x_driver));
}
module_init(lxt_init);
module_exit(lxt_exit);
static struct mdio_device_id __maybe_unused lxt_tbl[] = {
{ 0x78100000, 0xfffffff0 },
{ 0x001378e0, 0xfffffff0 },
{ 0x00137a10, 0xfffffff0 },
{ }
};
MODULE_DEVICE_TABLE(mdio, lxt_tbl);
