lxt.c

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/*
 * 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;
}

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);