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#include <asm/prom.h>
13
14/* Trigger specific functions */
15#ifdef CONFIG_GPIOLIB
16
17#include <linux/of_gpio.h>
18
19static int handle; /* reset pin handle */
20static unsigned int reset_val;
21
22void of_platform_reset_gpio_probe(void)
23{
24	int ret;
25	handle = of_get_named_gpio(of_find_node_by_path("/"),
26				   "hard-reset-gpios", 0);
27
28	if (!gpio_is_valid(handle)) {
29		pr_info("Skipping unavailable RESET gpio %d (%s)\n",
30				handle, "reset");
31		return;
32	}
33
34	ret = gpio_request(handle, "reset");
35	if (ret < 0) {
36		pr_info("GPIO pin is already allocated\n");
37		return;
38	}
39
40	/* get current setup value */
41	reset_val = gpio_get_value(handle);
42	/* FIXME maybe worth to perform any action */
43	pr_debug("Reset: Gpio output state: 0x%x\n", reset_val);
44
45	/* Setup GPIO as output */
46	ret = gpio_direction_output(handle, 0);
47	if (ret < 0)
48		goto err;
49
50	/* Setup output direction */
51	gpio_set_value(handle, 0);
52
53	pr_info("RESET: Registered gpio device: %d, current val: %d\n",
54							handle, reset_val);
55	return;
56err:
57	gpio_free(handle);
58	return;
59}
60
61
62static void gpio_system_reset(void)
63{
64	if (gpio_is_valid(handle))
65		gpio_set_value(handle, 1 - reset_val);
66	else
67		pr_notice("Reset GPIO unavailable - halting!\n");
68}
69#else
70static void gpio_system_reset(void)
71{
72	pr_notice("No reset GPIO present - halting!\n");
73}
74
75void of_platform_reset_gpio_probe(void)
76{
77	return;
78}
79#endif
80
81void machine_restart(char *cmd)
82{
83	pr_notice("Machine restart...\n");
84	gpio_system_reset();
85	while (1)
86		;
87}
88
89void machine_shutdown(void)
90{
91	pr_notice("Machine shutdown...\n");
92	while (1)
93		;
94}
95
96void machine_halt(void)
97{
98	pr_notice("Machine halt...\n");
99	while (1)
100		;
101}
102
103void machine_power_off(void)
104{
105	pr_notice("Machine power off...\n");
106	while (1)
107		;
108}
109