/*
 * Viper/Zeus PCMCIA support
 *   Copyright 2004 Arcom Control Systems
 *
 * Maintained by Marc Zyngier <maz@misterjones.org>
 *
 * Based on:
 *   iPAQ h2200 PCMCIA support
 *   Copyright 2004 Koen Kooi <koen@vestingbar.nl>
 *
 * 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 <mach/arcom-pcmcia.h>

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

static struct platform_device *arcom_pcmcia_dev;

static struct pcmcia_irqs irqs[] = {
        {
                .sock   = 0,
                .str    = "PCMCIA_CD",
        },
};

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->socket.pci_irq = gpio_to_irq(pdata->rdy_gpio);
        irqs[0].irq = gpio_to_irq(pdata->cd_gpio);

        if (gpio_request(pdata->cd_gpio, "CF detect"))
                goto err_request_cd;

        if (gpio_request(pdata->rdy_gpio, "CF ready"))
                goto err_request_rdy;

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

        local_irq_save(flags);

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

        local_irq_restore(flags);

        return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));

err_dir:
        gpio_free(pdata->pwr_gpio);
err_request_pwr:
        gpio_free(pdata->rdy_gpio);
err_request_rdy:
        gpio_free(pdata->cd_gpio);
err_request_cd:
        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();

        soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
        gpio_free(pdata->pwr_gpio);
        gpio_free(pdata->rdy_gpio);
        gpio_free(pdata->cd_gpio);
}

static void viper_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
                                      struct pcmcia_state *state)
{
        struct arcom_pcmcia_pdata *pdata = viper_get_pdata();

        state->detect = !gpio_get_value(pdata->cd_gpio);
        state->ready  = !!gpio_get_value(pdata->rdy_gpio);
        state->bvd1   = 1;
        state->bvd2   = 1;
        state->wrprot = 0;
        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 void viper_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
{
}

static void viper_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
{
}

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,
        .socket_init            = viper_pcmcia_socket_init,
        .socket_suspend         = viper_pcmcia_socket_suspend,
        .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,
};

static int __init viper_pcmcia_init(void)
{
        return platform_driver_register(&viper_pcmcia_driver);
}

static void __exit viper_pcmcia_exit(void)
{
        return platform_driver_unregister(&viper_pcmcia_driver);
}

module_init(viper_pcmcia_init);
module_exit(viper_pcmcia_exit);

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