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}
108