amd.c

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/*
 * Driver for AMD am79c PHYs
 *
 * Author: Heiko Schocher <[email protected]>
 *
 * Copyright (c) 2011 DENX Software Engineering GmbH
 *
 * 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/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/phy.h>

#define PHY_ID_AM79C874     0x0022561b

#define MII_AM79C_IR        17  /* Interrupt Status/Control Register */
#define MII_AM79C_IR_EN_LINK    0x0400  /* IR enable Linkstate */
#define MII_AM79C_IR_EN_ANEG    0x0100  /* IR enable Aneg Complete */
#define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG)

MODULE_DESCRIPTION("AMD PHY driver");
MODULE_AUTHOR("Heiko Schocher <[email protected]>");
MODULE_LICENSE("GPL");

static int am79c_ack_interrupt(struct phy_device *phydev)
{
    int err;

    err = phy_read(phydev, MII_BMSR);
    if (err < 0)
        return err;

    err = phy_read(phydev, MII_AM79C_IR);
    if (err < 0)
        return err;

    return 0;
}

static int am79c_config_init(struct phy_device *phydev)
{
    return 0;
}

static int am79c_config_intr(struct phy_device *phydev)
{
    int err;

    if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
        err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
    else
        err = phy_write(phydev, MII_AM79C_IR, 0);

    return err;
}

static struct phy_driver am79c_driver = {
    .phy_id     = PHY_ID_AM79C874,
    .name       = "AM79C874",
    .phy_id_mask    = 0xfffffff0,
    .features   = PHY_BASIC_FEATURES,
    .flags      = PHY_HAS_INTERRUPT,
    .config_init    = am79c_config_init,
    .config_aneg    = genphy_config_aneg,
    .read_status    = genphy_read_status,
    .ack_interrupt  = am79c_ack_interrupt,
    .config_intr    = am79c_config_intr,
    .driver     = { .owner = THIS_MODULE,},
};

static int __init am79c_init(void)
{
    return phy_driver_register(&am79c_driver);
}

static void __exit am79c_exit(void)
{
    phy_driver_unregister(&am79c_driver);
}

module_init(am79c_init);
module_exit(am79c_exit);

static struct mdio_device_id __maybe_unused amd_tbl[] = {
    { PHY_ID_AM79C874, 0xfffffff0 },
    { }
};

MODULE_DEVICE_TABLE(mdio, amd_tbl);