pxa2xx_stargate2.c

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/*
 * linux/drivers/pcmcia/pxa2xx_stargate2.c
 *
 * Stargate 2 PCMCIA specific routines.
 *
 * Created: December 6, 2005
 * Author:  Ed C. Epp
 * Copyright:   Intel Corp 2005
 *              Jonathan Cameron <[email protected]> 2009
 *
 * 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/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>

#include <pcmcia/ss.h>

#include <asm/irq.h>
#include <asm/mach-types.h>

#include "soc_common.h"

#define SG2_S0_POWER_CTL    108
#define SG2_S0_GPIO_RESET   82
#define SG2_S0_GPIO_DETECT  53
#define SG2_S0_GPIO_READY   81

static struct gpio sg2_pcmcia_gpios[] = {
    { SG2_S0_GPIO_RESET, GPIOF_OUT_INIT_HIGH, "PCMCIA Reset" },
    { SG2_S0_POWER_CTL, GPIOF_OUT_INIT_HIGH, "PCMCIA Power Ctrl" },
};

static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
    skt->stat[SOC_STAT_CD].gpio = SG2_S0_GPIO_DETECT;
    skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
    skt->stat[SOC_STAT_RDY].gpio = SG2_S0_GPIO_READY;
    skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
    return 0;
}

static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
                    struct pcmcia_state *state)
{
    state->bvd1   = 0; /* not available - battery detect on card */
    state->bvd2   = 0; /* not available */
    state->vs_3v  = 1; /* not available - voltage detect for card */
    state->vs_Xv  = 0; /* not available */
}

static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
                       const socket_state_t *state)
{
    /* Enable card power */
    switch (state->Vcc) {
    case 0:
        /* sets power ctl register high */
        gpio_set_value(SG2_S0_POWER_CTL, 1);
        break;
    case 33:
    case 50:
        /* sets power control register low (clear) */
        gpio_set_value(SG2_S0_POWER_CTL, 0);
        msleep(100);
        break;
    default:
        pr_err("%s(): bad Vcc %u\n",
               __func__, state->Vcc);
        return -1;
    }

    /* reset */
    gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));

    return 0;
}

static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
    .owner          = THIS_MODULE,
    .hw_init        = sg2_pcmcia_hw_init,
    .socket_state       = sg2_pcmcia_socket_state,
    .configure_socket   = sg2_pcmcia_configure_socket,
    .nr         = 1,
};

static struct platform_device *sg2_pcmcia_device;

static int __init sg2_pcmcia_init(void)
{
    int ret;

    if (!machine_is_stargate2())
        return -ENODEV;

    sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
    if (!sg2_pcmcia_device)
        return -ENOMEM;

    ret = gpio_request_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
    if (ret)
        goto error_put_platform_device;

    ret = platform_device_add_data(sg2_pcmcia_device,
                       &sg2_pcmcia_ops,
                       sizeof(sg2_pcmcia_ops));
    if (ret)
        goto error_free_gpios;

    ret = platform_device_add(sg2_pcmcia_device);
    if (ret)
        goto error_free_gpios;

    return 0;
error_free_gpios:
    gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
error_put_platform_device:
    platform_device_put(sg2_pcmcia_device);

    return ret;
}

static void __exit sg2_pcmcia_exit(void)
{
    platform_device_unregister(sg2_pcmcia_device);
    gpio_free_array(sg2_pcmcia_gpios, ARRAY_SIZE(sg2_pcmcia_gpios));
}

fs_initcall(sg2_pcmcia_init);
module_exit(sg2_pcmcia_exit);

MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-pcmcia");