1. 根目录:
2. drivers
3. pcmcia
4. pxa2xx_cm_x255.c

/*
 * linux/drivers/pcmcia/pxa/pxa_cm_x255.c
 *
 * 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.
 *
 * Compulab Ltd., 2003, 2007, 2008
 * Mike Rapoport <mike@compulab.co.il>
 *
 */

#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/export.h>

#include "soc_common.h"

#define GPIO_PCMCIA_SKTSEL	(54)
#define GPIO_PCMCIA_S0_CD_VALID	(16)
#define GPIO_PCMCIA_S1_CD_VALID	(17)
#define GPIO_PCMCIA_S0_RDYINT	(6)
#define GPIO_PCMCIA_S1_RDYINT	(8)
#define GPIO_PCMCIA_RESET	(9)

static int cmx255_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
	int ret = gpio_request(GPIO_PCMCIA_RESET, "PCCard reset");
	if (ret)
		return ret;
	gpio_direction_output(GPIO_PCMCIA_RESET, 0);

	if (skt->nr == 0) {
		skt->stat[SOC_STAT_CD].gpio = GPIO_PCMCIA_S0_CD_VALID;
		skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
		skt->stat[SOC_STAT_RDY].gpio = GPIO_PCMCIA_S0_RDYINT;
		skt->stat[SOC_STAT_RDY].name = "PCMCIA0 RDY";
	} else {
		skt->stat[SOC_STAT_CD].gpio = GPIO_PCMCIA_S1_CD_VALID;
		skt->stat[SOC_STAT_CD].name = "PCMCIA1 CD";
		skt->stat[SOC_STAT_RDY].gpio = GPIO_PCMCIA_S1_RDYINT;
		skt->stat[SOC_STAT_RDY].name = "PCMCIA1 RDY";
	}

	return 0;
}

static void cmx255_pcmcia_shutdown(struct soc_pcmcia_socket *skt)
{
	gpio_free(GPIO_PCMCIA_RESET);
}


static void cmx255_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
				       struct pcmcia_state *state)
{
	state->vs_3v  = 0;
	state->vs_Xv  = 0;
}


static int cmx255_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
					  const socket_state_t *state)
{
	switch (skt->nr) {
	case 0:
		if (state->flags & SS_RESET) {
			gpio_set_value(GPIO_PCMCIA_SKTSEL, 0);
			udelay(1);
			gpio_set_value(GPIO_PCMCIA_RESET, 1);
			udelay(10);
			gpio_set_value(GPIO_PCMCIA_RESET, 0);
		}
		break;
	case 1:
		if (state->flags & SS_RESET) {
			gpio_set_value(GPIO_PCMCIA_SKTSEL, 1);
			udelay(1);
			gpio_set_value(GPIO_PCMCIA_RESET, 1);
			udelay(10);
			gpio_set_value(GPIO_PCMCIA_RESET, 0);
		}
		break;
	}

	return 0;
}

static struct pcmcia_low_level cmx255_pcmcia_ops __initdata = {
	.owner			= THIS_MODULE,
	.hw_init		= cmx255_pcmcia_hw_init,
	.hw_shutdown		= cmx255_pcmcia_shutdown,
	.socket_state		= cmx255_pcmcia_socket_state,
	.configure_socket	= cmx255_pcmcia_configure_socket,
	.nr			= 1,
};

static struct platform_device *cmx255_pcmcia_device;

int __init cmx255_pcmcia_init(void)
{
	int ret;

	cmx255_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);

	if (!cmx255_pcmcia_device)
		return -ENOMEM;

	ret = platform_device_add_data(cmx255_pcmcia_device, &cmx255_pcmcia_ops,
				       sizeof(cmx255_pcmcia_ops));

	if (ret == 0) {
		printk(KERN_INFO "Registering cm-x255 PCMCIA interface.\n");
		ret = platform_device_add(cmx255_pcmcia_device);
	}

	if (ret)
		platform_device_put(cmx255_pcmcia_device);

	return ret;
}

void __exit cmx255_pcmcia_exit(void)
{
	platform_device_unregister(cmx255_pcmcia_device);
}