forked from Minki/linux
105 lines
1.9 KiB
C
105 lines
1.9 KiB
C
/*
|
|
* Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
|
|
* Copyright (C) 2009 PetaLogix
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/of_platform.h>
|
|
#include <asm/prom.h>
|
|
|
|
/* Trigger specific functions */
|
|
#ifdef CONFIG_GPIOLIB
|
|
|
|
#include <linux/of_gpio.h>
|
|
|
|
static int handle; /* reset pin handle */
|
|
static unsigned int reset_val;
|
|
|
|
void of_platform_reset_gpio_probe(void)
|
|
{
|
|
int ret;
|
|
handle = of_get_named_gpio(of_find_node_by_path("/"),
|
|
"hard-reset-gpios", 0);
|
|
|
|
if (!gpio_is_valid(handle)) {
|
|
pr_info("Skipping unavailable RESET gpio %d (%s)\n",
|
|
handle, "reset");
|
|
return;
|
|
}
|
|
|
|
ret = gpio_request(handle, "reset");
|
|
if (ret < 0) {
|
|
pr_info("GPIO pin is already allocated\n");
|
|
return;
|
|
}
|
|
|
|
/* get current setup value */
|
|
reset_val = gpio_get_value(handle);
|
|
/* FIXME maybe worth to perform any action */
|
|
pr_debug("Reset: Gpio output state: 0x%x\n", reset_val);
|
|
|
|
/* Setup GPIO as output */
|
|
ret = gpio_direction_output(handle, 0);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
/* Setup output direction */
|
|
gpio_set_value(handle, 0);
|
|
|
|
pr_info("RESET: Registered gpio device: %d, current val: %d\n",
|
|
handle, reset_val);
|
|
return;
|
|
err:
|
|
gpio_free(handle);
|
|
return;
|
|
}
|
|
|
|
|
|
static void gpio_system_reset(void)
|
|
{
|
|
if (gpio_is_valid(handle))
|
|
gpio_set_value(handle, 1 - reset_val);
|
|
else
|
|
pr_notice("Reset GPIO unavailable - halting!\n");
|
|
}
|
|
#else
|
|
#define gpio_system_reset() do {} while (0)
|
|
void of_platform_reset_gpio_probe(void)
|
|
{
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
void machine_restart(char *cmd)
|
|
{
|
|
pr_notice("Machine restart...\n");
|
|
gpio_system_reset();
|
|
while (1)
|
|
;
|
|
}
|
|
|
|
void machine_shutdown(void)
|
|
{
|
|
pr_notice("Machine shutdown...\n");
|
|
while (1)
|
|
;
|
|
}
|
|
|
|
void machine_halt(void)
|
|
{
|
|
pr_notice("Machine halt...\n");
|
|
while (1)
|
|
;
|
|
}
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
pr_notice("Machine power off...\n");
|
|
while (1)
|
|
;
|
|
}
|