1/*
  2 * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
  3 * Copyright (C) 2009 PetaLogix
  4 *
  5 * This file is subject to the terms and conditions of the GNU General Public
  6 * License. See the file "COPYING" in the main directory of this archive
  7 * for more details.
  8 */
  9
 10#include <linux/init.h>
 
 11#include <linux/of_platform.h>
 12
 13/* Trigger specific functions */
 14#ifdef CONFIG_GPIOLIB
 15
 16#include <linux/of_gpio.h>
 17
 18static int handle; /* reset pin handle */
 19static unsigned int reset_val;
 20
 21void of_platform_reset_gpio_probe(void)
 22{
 23	int ret;
 24	handle = of_get_named_gpio(of_find_node_by_path("/"),
 25				   "hard-reset-gpios", 0);
 26
 27	if (!gpio_is_valid(handle)) {
 28		pr_info("Skipping unavailable RESET gpio %d (%s)\n",
 29				handle, "reset");
 30		return;
 31	}
 32
 33	ret = gpio_request(handle, "reset");
 34	if (ret < 0) {
 35		pr_info("GPIO pin is already allocated\n");
 36		return;
 37	}
 38
 39	/* get current setup value */
 40	reset_val = gpio_get_value(handle);
 41	/* FIXME maybe worth to perform any action */
 42	pr_debug("Reset: Gpio output state: 0x%x\n", reset_val);
 43
 44	/* Setup GPIO as output */
 45	ret = gpio_direction_output(handle, 0);
 46	if (ret < 0)
 47		goto err;
 48
 49	/* Setup output direction */
 50	gpio_set_value(handle, 0);
 51
 52	pr_info("RESET: Registered gpio device: %d, current val: %d\n",
 53							handle, reset_val);
 54	return;
 55err:
 56	gpio_free(handle);
 57	return;
 58}
 59
 60
 61static void gpio_system_reset(void)
 62{
 63	if (gpio_is_valid(handle))
 64		gpio_set_value(handle, 1 - reset_val);
 65	else
 66		pr_notice("Reset GPIO unavailable - halting!\n");
 67}
 68#else
 69static void gpio_system_reset(void)
 70{
 71	pr_notice("No reset GPIO present - halting!\n");
 72}
 73
 74void of_platform_reset_gpio_probe(void)
 75{
 76	return;
 77}
 78#endif
 79
 80void machine_restart(char *cmd)
 81{
 82	pr_notice("Machine restart...\n");
 83	gpio_system_reset();
 84	while (1)
 85		;
 86}
 87
 88void machine_shutdown(void)
 89{
 90	pr_notice("Machine shutdown...\n");
 91	while (1)
 92		;
 93}
 94
 95void machine_halt(void)
 96{
 97	pr_notice("Machine halt...\n");
 98	while (1)
 99		;
100}
101
102void machine_power_off(void)
103{
104	pr_notice("Machine power off...\n");
105	while (1)
106		;
 
 
 
 
 
 
 
 
 
107}

 1/*
 2 * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
 3 * Copyright (C) 2009 PetaLogix
 4 *
 5 * This file is subject to the terms and conditions of the GNU General Public
 6 * License. See the file "COPYING" in the main directory of this archive
 7 * for more details.
 8 */
 9
10#include <linux/init.h>
11#include <linux/delay.h>
12#include <linux/of_platform.h>
13#include <linux/reboot.h>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
14
15void machine_shutdown(void)
16{
17	pr_notice("Machine shutdown...\n");
18	while (1)
19		;
20}
21
22void machine_halt(void)
23{
24	pr_notice("Machine halt...\n");
25	while (1)
26		;
27}
28
29void machine_power_off(void)
30{
31	pr_notice("Machine power off...\n");
32	while (1)
33		;
34}
35
36void machine_restart(char *cmd)
37{
38	do_kernel_restart(cmd);
39	/* Give the restart hook 1 s to take us down */
40	mdelay(1000);
41	pr_emerg("Reboot failed -- System halted\n");
42	while (1);
43}