pxa2xx_palmtc.c

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/*
 * linux/drivers/pcmcia/pxa2xx_palmtc.c
 *
 * Driver for Palm Tungsten|C PCMCIA
 *
 * Copyright (C) 2008 Alex Osborne <[email protected]>
 * Copyright (C) 2009-2011 Marek Vasut <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/delay.h>

#include <asm/mach-types.h>
#include <mach/palmtc.h>
#include "soc_common.h"

static struct gpio palmtc_pcmcia_gpios[] = {
    { GPIO_NR_PALMTC_PCMCIA_POWER1, GPIOF_INIT_LOW, "PCMCIA Power 1" },
    { GPIO_NR_PALMTC_PCMCIA_POWER2, GPIOF_INIT_LOW, "PCMCIA Power 2" },
    { GPIO_NR_PALMTC_PCMCIA_POWER3, GPIOF_INIT_LOW, "PCMCIA Power 3" },
    { GPIO_NR_PALMTC_PCMCIA_RESET,  GPIOF_INIT_HIGH,"PCMCIA Reset" },
    { GPIO_NR_PALMTC_PCMCIA_PWRREADY, GPIOF_IN, "PCMCIA Power Ready" },
};

static int palmtc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
    int ret;

    ret = gpio_request_array(palmtc_pcmcia_gpios,
                ARRAY_SIZE(palmtc_pcmcia_gpios));

    skt->stat[SOC_STAT_RDY].gpio = GPIO_NR_PALMTC_PCMCIA_READY;
    skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";

    return ret;
}

static void palmtc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
    gpio_free_array(palmtc_pcmcia_gpios, ARRAY_SIZE(palmtc_pcmcia_gpios));
}

static void palmtc_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
                    struct pcmcia_state *state)
{
    state->detect = 1; /* always inserted */
    state->vs_3v  = 1;
    state->vs_Xv  = 0;
}

static int palmtc_wifi_powerdown(void)
{
    gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
    gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 0);
    mdelay(40);
    gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 0);
    return 0;
}

static int palmtc_wifi_powerup(void)
{
    int timeout = 50;

    gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 1);
    mdelay(50);

    /* Power up the card, 1.8V first, after a while 3.3V */
    gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 1);
    mdelay(100);
    gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 1);

    /* Wait till the card is ready */
    while (!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_PWRREADY) &&
        timeout) {
        mdelay(1);
        timeout--;
    }

    /* Power down the WiFi in case of error */
    if (!timeout) {
        palmtc_wifi_powerdown();
        return 1;
    }

    /* Reset the card */
    gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
    mdelay(20);
    gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 0);
    mdelay(25);

    gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 0);

    return 0;
}

static int palmtc_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
                    const socket_state_t *state)
{
    int ret = 1;

    if (state->Vcc == 0)
        ret = palmtc_wifi_powerdown();
    else if (state->Vcc == 33)
        ret = palmtc_wifi_powerup();

    return ret;
}

static struct pcmcia_low_level palmtc_pcmcia_ops = {
    .owner          = THIS_MODULE,

    .first          = 0,
    .nr         = 1,

    .hw_init        = palmtc_pcmcia_hw_init,
    .hw_shutdown        = palmtc_pcmcia_hw_shutdown,

    .socket_state       = palmtc_pcmcia_socket_state,
    .configure_socket   = palmtc_pcmcia_configure_socket,
};

static struct platform_device *palmtc_pcmcia_device;

static int __init palmtc_pcmcia_init(void)
{
    int ret;

    if (!machine_is_palmtc())
        return -ENODEV;

    palmtc_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
    if (!palmtc_pcmcia_device)
        return -ENOMEM;

    ret = platform_device_add_data(palmtc_pcmcia_device, &palmtc_pcmcia_ops,
                    sizeof(palmtc_pcmcia_ops));

    if (!ret)
        ret = platform_device_add(palmtc_pcmcia_device);

    if (ret)
        platform_device_put(palmtc_pcmcia_device);

    return ret;
}

static void __exit palmtc_pcmcia_exit(void)
{
    platform_device_unregister(palmtc_pcmcia_device);
}

module_init(palmtc_pcmcia_init);
module_exit(palmtc_pcmcia_exit);

MODULE_AUTHOR("Alex Osborne <[email protected]>,"
        " Marek Vasut <[email protected]>");
MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten|C");
MODULE_ALIAS("platform:pxa2xx-pcmcia");
MODULE_LICENSE("GPL");