pxa2xx_viper.c

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/*
 * Viper/Zeus PCMCIA support
 *   Copyright 2004 Arcom Control Systems
 *
 * Maintained by Marc Zyngier <[email protected]>
 *
 * Based on:
 *   iPAQ h2200 PCMCIA support
 *   Copyright 2004 Koen Kooi <[email protected]>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>

#include <pcmcia/ss.h>

#include <asm/irq.h>

#include <linux/platform_data/pcmcia-pxa2xx_viper.h>

#include "soc_common.h"
#include "pxa2xx_base.h"

static struct platform_device *arcom_pcmcia_dev;

static inline struct arcom_pcmcia_pdata *viper_get_pdata(void)
{
    return arcom_pcmcia_dev->dev.platform_data;
}

static int viper_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
    struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
    unsigned long flags;

    skt->stat[SOC_STAT_CD].gpio = pdata->cd_gpio;
    skt->stat[SOC_STAT_CD].name = "PCMCIA_CD";
    skt->stat[SOC_STAT_RDY].gpio = pdata->rdy_gpio;
    skt->stat[SOC_STAT_RDY].name = "CF ready";

    if (gpio_request(pdata->pwr_gpio, "CF power"))
        goto err_request_pwr;

    local_irq_save(flags);

    if (gpio_direction_output(pdata->pwr_gpio, 0)) {
        local_irq_restore(flags);
        goto err_dir;
    }

    local_irq_restore(flags);

    return 0;

err_dir:
    gpio_free(pdata->pwr_gpio);
err_request_pwr:
    dev_err(&arcom_pcmcia_dev->dev, "Failed to setup PCMCIA GPIOs\n");
    return -1;
}

/*
 * Release all resources.
 */
static void viper_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
    struct arcom_pcmcia_pdata *pdata = viper_get_pdata();

    gpio_free(pdata->pwr_gpio);
}

static void viper_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
                      struct pcmcia_state *state)
{
    state->vs_3v  = 1; /* Can only apply 3.3V */
    state->vs_Xv  = 0;
}

static int viper_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
                     const socket_state_t *state)
{
    struct arcom_pcmcia_pdata *pdata = viper_get_pdata();

    /* Silently ignore Vpp, output enable, speaker enable. */
    pdata->reset(state->flags & SS_RESET);

    /* Apply socket voltage */
    switch (state->Vcc) {
    case 0:
        gpio_set_value(pdata->pwr_gpio, 0);
        break;
    case 33:
        gpio_set_value(pdata->pwr_gpio, 1);
        break;
    default:
        dev_err(&arcom_pcmcia_dev->dev, "Unsupported Vcc:%d\n", state->Vcc);
        return -1;
    }

    return 0;
}

static struct pcmcia_low_level viper_pcmcia_ops = {
    .owner              = THIS_MODULE,
    .hw_init            = viper_pcmcia_hw_init,
    .hw_shutdown        = viper_pcmcia_hw_shutdown,
    .socket_state       = viper_pcmcia_socket_state,
    .configure_socket   = viper_pcmcia_configure_socket,
    .nr                 = 1,
};

static struct platform_device *viper_pcmcia_device;

static int viper_pcmcia_probe(struct platform_device *pdev)
{
    int ret;

    /* I can't imagine more than one device, but you never know... */
    if (arcom_pcmcia_dev)
        return -EEXIST;

    if (!pdev->dev.platform_data)
        return -EINVAL;

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

    arcom_pcmcia_dev = pdev;

    viper_pcmcia_device->dev.parent = &pdev->dev;

    ret = platform_device_add_data(viper_pcmcia_device,
                       &viper_pcmcia_ops,
                       sizeof(viper_pcmcia_ops));

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

    if (ret) {
        platform_device_put(viper_pcmcia_device);
        arcom_pcmcia_dev = NULL;
    }

    return ret;
}

static int viper_pcmcia_remove(struct platform_device *pdev)
{
    platform_device_unregister(viper_pcmcia_device);
    arcom_pcmcia_dev = NULL;
    return 0;
}

static struct platform_device_id viper_pcmcia_id_table[] = {
    { .name = "viper-pcmcia", },
    { .name = "zeus-pcmcia",  },
    { },
};

static struct platform_driver viper_pcmcia_driver = {
    .probe      = viper_pcmcia_probe,
    .remove     = viper_pcmcia_remove,
    .driver     = {
        .name   = "arcom-pcmcia",
        .owner  = THIS_MODULE,
    },
    .id_table   = viper_pcmcia_id_table,
};

module_platform_driver(viper_pcmcia_driver);

MODULE_DEVICE_TABLE(platform, viper_pcmcia_id_table);
MODULE_LICENSE("GPL");