pxa2xx_stargate2.c
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/*
* linux/drivers/pcmcia/pxa2xx_stargate2.c
*
* Stargate 2 PCMCIA specific routines.
*
* Created: December 6, 2005
* Author: Ed C. Epp
* Copyright: Intel Corp 2005
* Jonathan Cameron <jic23@cam.ac.uk> 2009
*
* 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/interrupt.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <pcmcia/ss.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include "soc_common.h"
#define SG2_S0_BUFF_CTL 120
#define SG2_S0_POWER_CTL 108
#define SG2_S0_GPIO_RESET 82
#define SG2_S0_GPIO_DETECT 53
#define SG2_S0_GPIO_READY 81
static struct pcmcia_irqs irqs[] = {
{ 0, IRQ_GPIO(SG2_S0_GPIO_DETECT), "PCMCIA0 CD" },
};
static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
skt->socket.pci_irq = IRQ_GPIO(SG2_S0_GPIO_READY);
return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
}
static void sg2_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
}
static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
struct pcmcia_state *state)
{
state->detect = !gpio_get_value(SG2_S0_GPIO_DETECT);
state->ready = !!gpio_get_value(SG2_S0_GPIO_READY);
state->bvd1 = 0; /* not available - battery detect on card */
state->bvd2 = 0; /* not available */
state->vs_3v = 1; /* not available - voltage detect for card */
state->vs_Xv = 0; /* not available */
state->wrprot = 0; /* not available - write protect */
}
static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
const socket_state_t *state)
{
/* Enable card power */
switch (state->Vcc) {
case 0:
/* sets power ctl register high */
gpio_set_value(SG2_S0_POWER_CTL, 1);
break;
case 33:
case 50:
/* sets power control register low (clear) */
gpio_set_value(SG2_S0_POWER_CTL, 0);
msleep(100);
break;
default:
pr_err("%s(): bad Vcc %u\n",
__func__, state->Vcc);
return -1;
}
/* reset */
gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
return 0;
}
static void sg2_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
{
soc_pcmcia_enable_irqs(skt, irqs, ARRAY_SIZE(irqs));
}
static void sg2_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
{
soc_pcmcia_disable_irqs(skt, irqs, ARRAY_SIZE(irqs));
}
static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
.owner = THIS_MODULE,
.hw_init = sg2_pcmcia_hw_init,
.hw_shutdown = sg2_pcmcia_hw_shutdown,
.socket_state = sg2_pcmcia_socket_state,
.configure_socket = sg2_pcmcia_configure_socket,
.socket_init = sg2_pcmcia_socket_init,
.socket_suspend = sg2_pcmcia_socket_suspend,
.nr = 1,
};
static struct platform_device *sg2_pcmcia_device;
static int __init sg2_pcmcia_init(void)
{
int ret;
if (!machine_is_stargate2())
return -ENODEV;
sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
if (!sg2_pcmcia_device)
return -ENOMEM;
ret = gpio_request(SG2_S0_BUFF_CTL, "SG2 CF buff ctl");
if (ret)
goto error_put_platform_device;
ret = gpio_request(SG2_S0_POWER_CTL, "SG2 CF power ctl");
if (ret)
goto error_free_gpio_buff_ctl;
ret = gpio_request(SG2_S0_GPIO_RESET, "SG2 CF reset");
if (ret)
goto error_free_gpio_power_ctl;
/* Set gpio directions */
gpio_direction_output(SG2_S0_BUFF_CTL, 0);
gpio_direction_output(SG2_S0_POWER_CTL, 1);
gpio_direction_output(SG2_S0_GPIO_RESET, 1);
ret = platform_device_add_data(sg2_pcmcia_device,
&sg2_pcmcia_ops,
sizeof(sg2_pcmcia_ops));
if (ret)
goto error_free_gpio_reset;
ret = platform_device_add(sg2_pcmcia_device);
if (ret)
goto error_free_gpio_reset;
return 0;
error_free_gpio_reset:
gpio_free(SG2_S0_GPIO_RESET);
error_free_gpio_power_ctl:
gpio_free(SG2_S0_POWER_CTL);
error_free_gpio_buff_ctl:
gpio_free(SG2_S0_BUFF_CTL);
error_put_platform_device:
platform_device_put(sg2_pcmcia_device);
return ret;
}
static void __exit sg2_pcmcia_exit(void)
{
platform_device_unregister(sg2_pcmcia_device);
gpio_free(SG2_S0_BUFF_CTL);
gpio_free(SG2_S0_POWER_CTL);
gpio_free(SG2_S0_GPIO_RESET);
}
fs_initcall(sg2_pcmcia_init);
module_exit(sg2_pcmcia_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-pcmcia");