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gerrit-public.fairphone.software / kernel / msm-4.19 / d27050641e9bc056446deb0814e7ba1aa7911f5a / . / arch / mips / ralink / reset.c
blob: 55c7ec59df3cca8a73259ee84731189a91db49ce [file] [log] [blame]
John Crispinc06e8362013-01-20 22:00:57 +0100[diff] [blame]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>
John Crispin2a153f12013-09-04 00:16:59 +0200[diff] [blame]13#include <linux/of.h>
14#include <linux/reset-controller.h>
John Crispinc06e8362013-01-20 22:00:57 +0100[diff] [blame]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
John Crispin2a153f12013-09-04 00:16:59 +0200[diff] [blame]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
John Crispinc06e8362013-01-20 22:00:57 +0100[diff] [blame]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);