1/*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License version 2 as published
4 * by the Free Software Foundation.
5 *
6 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
7 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
8 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
9 */
10
11#include <linux/pm.h>
12#include <linux/io.h>
13#include <linux/of.h>
14#include <linux/reset-controller.h>
15
16#include <asm/reboot.h>
17
18#include <asm/mach-ralink/ralink_regs.h>
19
20/* Reset Control */
21#define SYSC_REG_RESET_CTRL     0x034
22#define RSTCTL_RESET_SYSTEM     BIT(0)
23
24static int ralink_assert_device(struct reset_controller_dev *rcdev,
25				unsigned long id)
26{
27	u32 val;
28
29	if (id < 8)
30		return -1;
31
32	val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
33	val |= BIT(id);
34	rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
35
36	return 0;
37}
38
39static int ralink_deassert_device(struct reset_controller_dev *rcdev,
40				  unsigned long id)
41{
42	u32 val;
43
44	if (id < 8)
45		return -1;
46
47	val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
48	val &= ~BIT(id);
49	rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
50
51	return 0;
52}
53
54static int ralink_reset_device(struct reset_controller_dev *rcdev,
55			       unsigned long id)
56{
57	ralink_assert_device(rcdev, id);
58	return ralink_deassert_device(rcdev, id);
59}
60
61static struct reset_control_ops reset_ops = {
62	.reset = ralink_reset_device,
63	.assert = ralink_assert_device,
64	.deassert = ralink_deassert_device,
65};
66
67static struct reset_controller_dev reset_dev = {
68	.ops			= &reset_ops,
69	.owner			= THIS_MODULE,
70	.nr_resets		= 32,
71	.of_reset_n_cells	= 1,
72};
73
74void ralink_rst_init(void)
75{
76	reset_dev.of_node = of_find_compatible_node(NULL, NULL,
77						"ralink,rt2880-reset");
78	if (!reset_dev.of_node)
79		pr_err("Failed to find reset controller node");
80	else
81		reset_controller_register(&reset_dev);
82}
83
84static void ralink_restart(char *command)
85{
86	local_irq_disable();
87	rt_sysc_w32(RSTCTL_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
88	unreachable();
89}
90
91static void ralink_halt(void)
92{
93	local_irq_disable();
94	unreachable();
95}
96
97static int __init mips_reboot_setup(void)
98{
99	_machine_restart = ralink_restart;
100	_machine_halt = ralink_halt;
101	pm_power_off = ralink_halt;
102
103	return 0;
104}
105
106arch_initcall(mips_reboot_setup);
107