sa1100_nanoengine.c

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/*
 * drivers/pcmcia/sa1100_nanoengine.c
 *
 * PCMCIA implementation routines for BSI nanoEngine.
 *
 * In order to have a fully functional pcmcia subsystem in a BSE nanoEngine
 * board you should carefully read this:
 * http://cambuca.ldhs.cetuc.puc-rio.br/nanoengine/
 *
 * Copyright (C) 2010 Marcelo Roberto Jimenez <[email protected]>
 *
 * Based on original work for kernel 2.4 by
 * Miguel Freitas <[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/device.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/signal.h>

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

#include <mach/hardware.h>
#include <mach/nanoengine.h>

#include "sa1100_generic.h"

struct nanoengine_pins {
    unsigned output_pins;
    unsigned clear_outputs;
    int gpio_rst;
    int gpio_cd;
    int gpio_rdy;
};

static struct nanoengine_pins nano_skts[] = {
    {
        .gpio_rst       = GPIO_PC_RESET0,
        .gpio_cd        = GPIO_PC_CD0,
        .gpio_rdy       = GPIO_PC_READY0,
    }, {
        .gpio_rst       = GPIO_PC_RESET1,
        .gpio_cd        = GPIO_PC_CD1,
        .gpio_rdy       = GPIO_PC_READY1,
    }
};

unsigned num_nano_pcmcia_sockets = ARRAY_SIZE(nano_skts);

static int nanoengine_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
    unsigned i = skt->nr;
    int ret;

    if (i >= num_nano_pcmcia_sockets)
        return -ENXIO;

    ret = gpio_request_one(nano_skts[i].gpio_rst, GPIOF_OUT_INIT_LOW,
        i ? "PC RST1" : "PC RST0");
    if (ret)
        return ret;

    skt->stat[SOC_STAT_CD].gpio = nano_skts[i].gpio_cd;
    skt->stat[SOC_STAT_CD].name = i ? "PC CD1" : "PC CD0";
    skt->stat[SOC_STAT_RDY].gpio = nano_skts[i].gpio_rdy;
    skt->stat[SOC_STAT_RDY].name = i ? "PC RDY1" : "PC RDY0";

    return 0;
}

static void nanoengine_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
    gpio_free(nano_skts[skt->nr].gpio_rst);
}

static int nanoengine_pcmcia_configure_socket(
    struct soc_pcmcia_socket *skt, const socket_state_t *state)
{
    unsigned i = skt->nr;

    if (i >= num_nano_pcmcia_sockets)
        return -ENXIO;

    gpio_set_value(nano_skts[skt->nr].gpio_rst, !!(state->flags & SS_RESET));

    return 0;
}

static void nanoengine_pcmcia_socket_state(
    struct soc_pcmcia_socket *skt, struct pcmcia_state *state)
{
    unsigned i = skt->nr;

    if (i >= num_nano_pcmcia_sockets)
        return;

    state->bvd1 = 1;
    state->bvd2 = 1;
    state->vs_3v = 1; /* Can only apply 3.3V */
    state->vs_Xv = 0;
}

static struct pcmcia_low_level nanoengine_pcmcia_ops = {
    .owner          = THIS_MODULE,

    .hw_init        = nanoengine_pcmcia_hw_init,
    .hw_shutdown        = nanoengine_pcmcia_hw_shutdown,

    .configure_socket   = nanoengine_pcmcia_configure_socket,
    .socket_state       = nanoengine_pcmcia_socket_state,
};

int pcmcia_nanoengine_init(struct device *dev)
{
    int ret = -ENODEV;

    if (machine_is_nanoengine())
        ret = sa11xx_drv_pcmcia_probe(
            dev, &nanoengine_pcmcia_ops, 0, 2);

    return ret;
}