blob: a488877a3538c8c9761d1c8e468cdf1c3edb91de [file] [log] [blame]
Lee Jonesf0745f32014-07-22 15:52:28 +01001/*
2 * Copyright (C) 2014 STMicroelectronics
3 *
4 * Power off Restart driver, used in STMicroelectronics devices.
5 *
6 * Author: Christophe Kerello <christophe.kerello@st.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2, as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_platform.h>
16#include <linux/platform_device.h>
17#include <linux/mfd/syscon.h>
Guenter Roeck453fe4f2015-01-25 12:30:43 -080018#include <linux/reboot.h>
Lee Jonesf0745f32014-07-22 15:52:28 +010019#include <linux/regmap.h>
20
Lee Jonesf0745f32014-07-22 15:52:28 +010021struct reset_syscfg {
22 struct regmap *regmap;
23 /* syscfg used for reset */
24 unsigned int offset_rst;
25 unsigned int mask_rst;
26 /* syscfg used for unmask the reset */
27 unsigned int offset_rst_msk;
28 unsigned int mask_rst_msk;
29};
30
31/* STiH415 */
32#define STIH415_SYSCFG_11 0x2c
33#define STIH415_SYSCFG_15 0x3c
34
35static struct reset_syscfg stih415_reset = {
36 .offset_rst = STIH415_SYSCFG_11,
37 .mask_rst = BIT(0),
38 .offset_rst_msk = STIH415_SYSCFG_15,
39 .mask_rst_msk = BIT(0)
40};
41
42/* STiH416 */
43#define STIH416_SYSCFG_500 0x7d0
44#define STIH416_SYSCFG_504 0x7e0
45
46static struct reset_syscfg stih416_reset = {
47 .offset_rst = STIH416_SYSCFG_500,
48 .mask_rst = BIT(0),
49 .offset_rst_msk = STIH416_SYSCFG_504,
50 .mask_rst_msk = BIT(0)
51};
52
53/* STiH407 */
54#define STIH407_SYSCFG_4000 0x0
55#define STIH407_SYSCFG_4008 0x20
56
57static struct reset_syscfg stih407_reset = {
58 .offset_rst = STIH407_SYSCFG_4000,
59 .mask_rst = BIT(0),
60 .offset_rst_msk = STIH407_SYSCFG_4008,
61 .mask_rst_msk = BIT(0)
62};
63
64/* STiD127 */
65#define STID127_SYSCFG_700 0x0
66#define STID127_SYSCFG_773 0x124
67
68static struct reset_syscfg stid127_reset = {
69 .offset_rst = STID127_SYSCFG_773,
70 .mask_rst = BIT(0),
71 .offset_rst_msk = STID127_SYSCFG_700,
72 .mask_rst_msk = BIT(8)
73};
74
75static struct reset_syscfg *st_restart_syscfg;
76
Guenter Roeck453fe4f2015-01-25 12:30:43 -080077static int st_restart(struct notifier_block *this, unsigned long mode,
78 void *cmd)
Lee Jonesf0745f32014-07-22 15:52:28 +010079{
80 /* reset syscfg updated */
81 regmap_update_bits(st_restart_syscfg->regmap,
82 st_restart_syscfg->offset_rst,
83 st_restart_syscfg->mask_rst,
84 0);
85
86 /* unmask the reset */
87 regmap_update_bits(st_restart_syscfg->regmap,
88 st_restart_syscfg->offset_rst_msk,
89 st_restart_syscfg->mask_rst_msk,
90 0);
Guenter Roeck453fe4f2015-01-25 12:30:43 -080091
92 return NOTIFY_DONE;
Lee Jonesf0745f32014-07-22 15:52:28 +010093}
94
Guenter Roeck453fe4f2015-01-25 12:30:43 -080095static struct notifier_block st_restart_nb = {
96 .notifier_call = st_restart,
97 .priority = 192,
98};
99
Fabian Frederick8fb08852015-03-16 20:17:12 +0100100static const struct of_device_id st_reset_of_match[] = {
Lee Jonesf0745f32014-07-22 15:52:28 +0100101 {
102 .compatible = "st,stih415-restart",
103 .data = (void *)&stih415_reset,
104 }, {
105 .compatible = "st,stih416-restart",
106 .data = (void *)&stih416_reset,
107 }, {
108 .compatible = "st,stih407-restart",
109 .data = (void *)&stih407_reset,
110 }, {
111 .compatible = "st,stid127-restart",
112 .data = (void *)&stid127_reset,
113 },
114 {}
115};
116
117static int st_reset_probe(struct platform_device *pdev)
118{
119 struct device_node *np = pdev->dev.of_node;
120 const struct of_device_id *match;
121 struct device *dev = &pdev->dev;
122
123 match = of_match_device(st_reset_of_match, dev);
124 if (!match)
125 return -ENODEV;
126
127 st_restart_syscfg = (struct reset_syscfg *)match->data;
128
129 st_restart_syscfg->regmap =
130 syscon_regmap_lookup_by_phandle(np, "st,syscfg");
131 if (IS_ERR(st_restart_syscfg->regmap)) {
132 dev_err(dev, "No syscfg phandle specified\n");
133 return PTR_ERR(st_restart_syscfg->regmap);
134 }
135
Guenter Roeck453fe4f2015-01-25 12:30:43 -0800136 return register_restart_handler(&st_restart_nb);
Lee Jonesf0745f32014-07-22 15:52:28 +0100137}
138
139static struct platform_driver st_reset_driver = {
140 .probe = st_reset_probe,
141 .driver = {
142 .name = "st_reset",
143 .of_match_table = st_reset_of_match,
144 },
145};
146
147static int __init st_reset_init(void)
148{
149 return platform_driver_register(&st_reset_driver);
150}
151
152device_initcall(st_reset_init);
153
154MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>");
155MODULE_DESCRIPTION("STMicroelectronics Power off Restart driver");
156MODULE_LICENSE("GPL v2");