pxa2xx_balloon3.c

Go to the documentation of this file.

/*
 * linux/drivers/pcmcia/pxa2xx_balloon3.c
 *
 * Balloon3 PCMCIA specific routines.
 *
 *  Author: Nick Bane
 *  Created:    June, 2006
 *  Copyright:  Toby Churchill Ltd
 *  Derived from pxa2xx_mainstone.c, by Nico Pitre
 *
 * Various modification by 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/gpio.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <mach/balloon3.h>

#include <asm/mach-types.h>

#include "soc_common.h"

static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
    uint16_t ver;

    ver = __raw_readw(BALLOON3_FPGA_VER);
    if (ver < 0x4f08)
        pr_warn("The FPGA code, version 0x%04x, is too old. "
            "PCMCIA/CF support might be broken in this version!",
            ver);

    skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
    skt->stat[SOC_STAT_CD].gpio = BALLOON3_GPIO_S0_CD;
    skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
    skt->stat[SOC_STAT_BVD1].irq = BALLOON3_BP_NSTSCHG_IRQ;
    skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";

    return 0;
}

static unsigned long balloon3_pcmcia_status[2] = {
    BALLOON3_CF_nSTSCHG_BVD1,
    BALLOON3_CF_nSTSCHG_BVD1
};

static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
                    struct pcmcia_state *state)
{
    uint16_t status;
    int flip;

    /* This actually reads the STATUS register */
    status = __raw_readw(BALLOON3_CF_STATUS_REG);
    flip = (status ^ balloon3_pcmcia_status[skt->nr])
        & BALLOON3_CF_nSTSCHG_BVD1;
    /*
     * Workaround for STSCHG which can't be deasserted:
     * We therefore disable/enable corresponding IRQs
     * as needed to avoid IRQ locks.
     */
    if (flip) {
        balloon3_pcmcia_status[skt->nr] = status;
        if (status & BALLOON3_CF_nSTSCHG_BVD1)
            enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
        else
            disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
    }

    state->ready    = !!(status & BALLOON3_CF_nIRQ);
    state->bvd1 = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
    state->bvd2 = 0;    /* not available */
    state->vs_3v    = 1;    /* Always true its a CF card */
    state->vs_Xv    = 0;    /* not available */
}

static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
                       const socket_state_t *state)
{
    __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +
            ((state->flags & SS_RESET) ?
            BALLOON3_FPGA_SETnCLR : 0));
    return 0;
}

static struct pcmcia_low_level balloon3_pcmcia_ops = {
    .owner          = THIS_MODULE,
    .hw_init        = balloon3_pcmcia_hw_init,
    .socket_state       = balloon3_pcmcia_socket_state,
    .configure_socket   = balloon3_pcmcia_configure_socket,
    .first          = 0,
    .nr         = 1,
};

static struct platform_device *balloon3_pcmcia_device;

static int __init balloon3_pcmcia_init(void)
{
    int ret;

    if (!machine_is_balloon3())
        return -ENODEV;

    balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
    if (!balloon3_pcmcia_device)
        return -ENOMEM;

    ret = platform_device_add_data(balloon3_pcmcia_device,
            &balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));

    if (!ret)
        ret = platform_device_add(balloon3_pcmcia_device);

    if (ret)
        platform_device_put(balloon3_pcmcia_device);

    return ret;
}

static void __exit balloon3_pcmcia_exit(void)
{
    platform_device_unregister(balloon3_pcmcia_device);
}

module_init(balloon3_pcmcia_init);
module_exit(balloon3_pcmcia_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nick Bane <[email protected]>");
MODULE_ALIAS("platform:pxa2xx-pcmcia");
MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");