2009-10-02 03:48:47 -07:00
|
|
|
/*
|
|
|
|
* 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 */
|
2009-10-29 02:12:59 -07:00
|
|
|
static unsigned int reset_val;
|
2009-10-02 03:48:47 -07:00
|
|
|
|
|
|
|
static int of_reset_gpio_handle(void)
|
|
|
|
{
|
|
|
|
int ret; /* variable which stored handle reset gpio pin */
|
|
|
|
struct device_node *root; /* root node */
|
|
|
|
struct device_node *gpio; /* gpio node */
|
2010-06-08 06:48:16 -07:00
|
|
|
struct gpio_chip *gc;
|
|
|
|
u32 flags;
|
2009-10-02 03:48:47 -07:00
|
|
|
const void *gpio_spec;
|
|
|
|
|
|
|
|
/* find out root node */
|
|
|
|
root = of_find_node_by_path("/");
|
|
|
|
|
|
|
|
/* give me handle for gpio node to be possible allocate pin */
|
|
|
|
ret = of_parse_phandles_with_args(root, "hard-reset-gpios",
|
|
|
|
"#gpio-cells", 0, &gpio, &gpio_spec);
|
|
|
|
if (ret) {
|
|
|
|
pr_debug("%s: can't parse gpios property\n", __func__);
|
|
|
|
goto err0;
|
|
|
|
}
|
|
|
|
|
2010-06-08 06:48:16 -07:00
|
|
|
gc = gpio->data;
|
|
|
|
if (!gc) {
|
2009-10-02 03:48:47 -07:00
|
|
|
pr_debug("%s: gpio controller %s isn't registered\n",
|
|
|
|
root->full_name, gpio->full_name);
|
|
|
|
ret = -ENODEV;
|
|
|
|
goto err1;
|
|
|
|
}
|
|
|
|
|
2010-06-08 06:48:16 -07:00
|
|
|
ret = gc->of_xlate(gc, root, gpio_spec, &flags);
|
2009-10-02 03:48:47 -07:00
|
|
|
if (ret < 0)
|
|
|
|
goto err1;
|
|
|
|
|
2010-06-08 06:48:16 -07:00
|
|
|
ret += gc->base;
|
2009-10-02 03:48:47 -07:00
|
|
|
err1:
|
|
|
|
of_node_put(gpio);
|
|
|
|
err0:
|
|
|
|
pr_debug("%s exited with status %d\n", __func__, ret);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
void of_platform_reset_gpio_probe(void)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
handle = of_reset_gpio_handle();
|
|
|
|
|
|
|
|
if (!gpio_is_valid(handle)) {
|
|
|
|
printk(KERN_INFO "Skipping unavailable RESET gpio %d (%s)\n",
|
|
|
|
handle, "reset");
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = gpio_request(handle, "reset");
|
|
|
|
if (ret < 0) {
|
|
|
|
printk(KERN_INFO "GPIO pin is already allocated\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* get current setup value */
|
2009-10-29 02:12:59 -07:00
|
|
|
reset_val = gpio_get_value(handle);
|
2009-10-02 03:48:47 -07:00
|
|
|
/* FIXME maybe worth to perform any action */
|
2009-10-29 02:12:59 -07:00
|
|
|
pr_debug("Reset: Gpio output state: 0x%x\n", reset_val);
|
2009-10-02 03:48:47 -07:00
|
|
|
|
|
|
|
/* Setup GPIO as output */
|
|
|
|
ret = gpio_direction_output(handle, 0);
|
|
|
|
if (ret < 0)
|
|
|
|
goto err;
|
|
|
|
|
|
|
|
/* Setup output direction */
|
|
|
|
gpio_set_value(handle, 0);
|
|
|
|
|
2009-10-29 02:12:59 -07:00
|
|
|
printk(KERN_INFO "RESET: Registered gpio device: %d, current val: %d\n",
|
|
|
|
handle, reset_val);
|
2009-10-02 03:48:47 -07:00
|
|
|
return;
|
|
|
|
err:
|
|
|
|
gpio_free(handle);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void gpio_system_reset(void)
|
|
|
|
{
|
2009-10-29 02:12:59 -07:00
|
|
|
gpio_set_value(handle, 1 - reset_val);
|
2009-10-02 03:48:47 -07:00
|
|
|
}
|
|
|
|
#else
|
|
|
|
#define gpio_system_reset() do {} while (0)
|
|
|
|
void of_platform_reset_gpio_probe(void)
|
|
|
|
{
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
void machine_restart(char *cmd)
|
|
|
|
{
|
|
|
|
printk(KERN_NOTICE "Machine restart...\n");
|
|
|
|
gpio_system_reset();
|
|
|
|
dump_stack();
|
|
|
|
while (1)
|
|
|
|
;
|
|
|
|
}
|
|
|
|
|
|
|
|
void machine_shutdown(void)
|
|
|
|
{
|
|
|
|
printk(KERN_NOTICE "Machine shutdown...\n");
|
|
|
|
while (1)
|
|
|
|
;
|
|
|
|
}
|
|
|
|
|
|
|
|
void machine_halt(void)
|
|
|
|
{
|
|
|
|
printk(KERN_NOTICE "Machine halt...\n");
|
|
|
|
while (1)
|
|
|
|
;
|
|
|
|
}
|
|
|
|
|
|
|
|
void machine_power_off(void)
|
|
|
|
{
|
|
|
|
printk(KERN_NOTICE "Machine power off...\n");
|
|
|
|
while (1)
|
|
|
|
;
|
|
|
|
}
|