davicom.c

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/*
 * drivers/net/phy/davicom.c
 *
 * Driver for Davicom 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>

#define MII_DM9161_SCR      0x10
#define MII_DM9161_SCR_INIT 0x0610
#define MII_DM9161_SCR_RMII 0x0100

/* DM9161 Interrupt Register */
#define MII_DM9161_INTR 0x15
#define MII_DM9161_INTR_PEND        0x8000
#define MII_DM9161_INTR_DPLX_MASK   0x0800
#define MII_DM9161_INTR_SPD_MASK    0x0400
#define MII_DM9161_INTR_LINK_MASK   0x0200
#define MII_DM9161_INTR_MASK        0x0100
#define MII_DM9161_INTR_DPLX_CHANGE 0x0010
#define MII_DM9161_INTR_SPD_CHANGE  0x0008
#define MII_DM9161_INTR_LINK_CHANGE 0x0004
#define MII_DM9161_INTR_INIT        0x0000
#define MII_DM9161_INTR_STOP    \
(MII_DM9161_INTR_DPLX_MASK | MII_DM9161_INTR_SPD_MASK \
 | MII_DM9161_INTR_LINK_MASK | MII_DM9161_INTR_MASK)

/* DM9161 10BT Configuration/Status */
#define MII_DM9161_10BTCSR  0x12
#define MII_DM9161_10BTCSR_INIT 0x7800

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


#define DM9161_DELAY 1
static int dm9161_config_intr(struct phy_device *phydev)
{
    int temp;

    temp = phy_read(phydev, MII_DM9161_INTR);

    if (temp < 0)
        return temp;

    if(PHY_INTERRUPT_ENABLED == phydev->interrupts )
        temp &= ~(MII_DM9161_INTR_STOP);
    else
        temp |= MII_DM9161_INTR_STOP;

    temp = phy_write(phydev, MII_DM9161_INTR, temp);

    return temp;
}

static int dm9161_config_aneg(struct phy_device *phydev)
{
    int err;

    /* Isolate the PHY */
    err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);

    if (err < 0)
        return err;

    /* Configure the new settings */
    err = genphy_config_aneg(phydev);

    if (err < 0)
        return err;

    return 0;
}

static int dm9161_config_init(struct phy_device *phydev)
{
    int err, temp;

    /* Isolate the PHY */
    err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);

    if (err < 0)
        return err;

    switch (phydev->interface) {
    case PHY_INTERFACE_MODE_MII:
        temp = MII_DM9161_SCR_INIT;
        break;
    case PHY_INTERFACE_MODE_RMII:
        temp =  MII_DM9161_SCR_INIT | MII_DM9161_SCR_RMII;
        break;
    default:
        return -EINVAL;
    }

    /* Do not bypass the scrambler/descrambler */
    err = phy_write(phydev, MII_DM9161_SCR, temp);
    if (err < 0)
        return err;

    /* Clear 10BTCSR to default */
    err = phy_write(phydev, MII_DM9161_10BTCSR, MII_DM9161_10BTCSR_INIT);

    if (err < 0)
        return err;

    /* Reconnect the PHY, and enable Autonegotiation */
    return phy_write(phydev, MII_BMCR, BMCR_ANENABLE);
}

static int dm9161_ack_interrupt(struct phy_device *phydev)
{
    int err = phy_read(phydev, MII_DM9161_INTR);

    return (err < 0) ? err : 0;
}

static struct phy_driver dm91xx_driver[] = {
{
    .phy_id     = 0x0181b880,
    .name       = "Davicom DM9161E",
    .phy_id_mask    = 0x0ffffff0,
    .features   = PHY_BASIC_FEATURES,
    .config_init    = dm9161_config_init,
    .config_aneg    = dm9161_config_aneg,
    .read_status    = genphy_read_status,
    .driver     = { .owner = THIS_MODULE,},
}, {
    .phy_id     = 0x0181b8a0,
    .name       = "Davicom DM9161A",
    .phy_id_mask    = 0x0ffffff0,
    .features   = PHY_BASIC_FEATURES,
    .config_init    = dm9161_config_init,
    .config_aneg    = dm9161_config_aneg,
    .read_status    = genphy_read_status,
    .driver     = { .owner = THIS_MODULE,},
}, {
    .phy_id     = 0x00181b80,
    .name       = "Davicom DM9131",
    .phy_id_mask    = 0x0ffffff0,
    .features   = PHY_BASIC_FEATURES,
    .flags      = PHY_HAS_INTERRUPT,
    .config_aneg    = genphy_config_aneg,
    .read_status    = genphy_read_status,
    .ack_interrupt  = dm9161_ack_interrupt,
    .config_intr    = dm9161_config_intr,
    .driver     = { .owner = THIS_MODULE,},
} };

static int __init davicom_init(void)
{
    return phy_drivers_register(dm91xx_driver,
        ARRAY_SIZE(dm91xx_driver));
}

static void __exit davicom_exit(void)
{
    phy_drivers_unregister(dm91xx_driver,
        ARRAY_SIZE(dm91xx_driver));
}

module_init(davicom_init);
module_exit(davicom_exit);

static struct mdio_device_id __maybe_unused davicom_tbl[] = {
    { 0x0181b880, 0x0ffffff0 },
    { 0x0181b8a0, 0x0ffffff0 },
    { 0x00181b80, 0x0ffffff0 },
    { }
};

MODULE_DEVICE_TABLE(mdio, davicom_tbl);