pxa2xx_mainstone.c

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/*
 * linux/drivers/pcmcia/pxa2xx_mainstone.c
 *
 * Mainstone PCMCIA specific routines.
 *
 * Created: May 12, 2004
 * Author:  Nicolas Pitre
 * Copyright:   MontaVista Software Inc.
 *
 * 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/errno.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#include <pcmcia/ss.h>

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

#include <mach/pxa2xx-regs.h>
#include <mach/mainstone.h>

#include "soc_common.h"


static int mst_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
    /*
     * Setup default state of GPIO outputs
     * before we enable them as outputs.
     */
    if (skt->nr == 0) {
        skt->socket.pci_irq = MAINSTONE_S0_IRQ;
        skt->stat[SOC_STAT_CD].irq = MAINSTONE_S0_CD_IRQ;
        skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
        skt->stat[SOC_STAT_BVD1].irq = MAINSTONE_S0_STSCHG_IRQ;
        skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";
    } else {
        skt->socket.pci_irq = MAINSTONE_S1_IRQ;
        skt->stat[SOC_STAT_CD].irq = MAINSTONE_S1_CD_IRQ;
        skt->stat[SOC_STAT_CD].name = "PCMCIA1 CD";
        skt->stat[SOC_STAT_BVD1].irq = MAINSTONE_S1_STSCHG_IRQ;
        skt->stat[SOC_STAT_BVD1].name = "PCMCIA1 STSCHG";
    }
    return 0;
}

static unsigned long mst_pcmcia_status[2];

static void mst_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
                    struct pcmcia_state *state)
{
    unsigned long status, flip;

    status = (skt->nr == 0) ? MST_PCMCIA0 : MST_PCMCIA1;
    flip = (status ^ mst_pcmcia_status[skt->nr]) & MST_PCMCIA_nSTSCHG_BVD1;

    /*
     * Workaround for STSCHG which can't be deasserted:
     * We therefore disable/enable corresponding IRQs
     * as needed to avoid IRQ locks.
     */
    if (flip) {
        mst_pcmcia_status[skt->nr] = status;
        if (status & MST_PCMCIA_nSTSCHG_BVD1)
            enable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
                           : MAINSTONE_S1_STSCHG_IRQ );
        else
            disable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
                            : MAINSTONE_S1_STSCHG_IRQ );
    }

    state->detect = (status & MST_PCMCIA_nCD) ? 0 : 1;
    state->ready  = (status & MST_PCMCIA_nIRQ) ? 1 : 0;
    state->bvd1   = (status & MST_PCMCIA_nSTSCHG_BVD1) ? 1 : 0;
    state->bvd2   = (status & MST_PCMCIA_nSPKR_BVD2) ? 1 : 0;
    state->vs_3v  = (status & MST_PCMCIA_nVS1) ? 0 : 1;
    state->vs_Xv  = (status & MST_PCMCIA_nVS2) ? 0 : 1;
}

static int mst_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
                       const socket_state_t *state)
{
    unsigned long power = 0;
    int ret = 0;

    switch (state->Vcc) {
    case 0:  power |= MST_PCMCIA_PWR_VCC_0;  break;
    case 33: power |= MST_PCMCIA_PWR_VCC_33; break;
    case 50: power |= MST_PCMCIA_PWR_VCC_50; break;
    default:
         printk(KERN_ERR "%s(): bad Vcc %u\n",
                 __func__, state->Vcc);
         ret = -1;
    }

    switch (state->Vpp) {
    case 0:   power |= MST_PCMCIA_PWR_VPP_0;   break;
    case 120: power |= MST_PCMCIA_PWR_VPP_120; break;
    default:
          if(state->Vpp == state->Vcc) {
              power |= MST_PCMCIA_PWR_VPP_VCC;
          } else {
              printk(KERN_ERR "%s(): bad Vpp %u\n",
                      __func__, state->Vpp);
              ret = -1;
          }
    }

    if (state->flags & SS_RESET)
           power |= MST_PCMCIA_RESET;

    switch (skt->nr) {
    case 0:  MST_PCMCIA0 = power; break;
    case 1:  MST_PCMCIA1 = power; break;
    default: ret = -1;
    }

    return ret;
}

static struct pcmcia_low_level mst_pcmcia_ops __initdata = {
    .owner          = THIS_MODULE,
    .hw_init        = mst_pcmcia_hw_init,
    .socket_state       = mst_pcmcia_socket_state,
    .configure_socket   = mst_pcmcia_configure_socket,
    .nr         = 2,
};

static struct platform_device *mst_pcmcia_device;

static int __init mst_pcmcia_init(void)
{
    int ret;

    if (!machine_is_mainstone())
        return -ENODEV;

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

    ret = platform_device_add_data(mst_pcmcia_device, &mst_pcmcia_ops,
                       sizeof(mst_pcmcia_ops));
    if (ret == 0)
        ret = platform_device_add(mst_pcmcia_device);

    if (ret)
        platform_device_put(mst_pcmcia_device);

    return ret;
}

static void __exit mst_pcmcia_exit(void)
{
    platform_device_unregister(mst_pcmcia_device);
}

fs_initcall(mst_pcmcia_init);
module_exit(mst_pcmcia_exit);

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