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f0745f36 LJ |
1 | /* |
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> | |
453fe4f1 | 18 | #include <linux/reboot.h> |
f0745f36 LJ |
19 | #include <linux/regmap.h> |
20 | ||
f0745f36 LJ |
21 | struct 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 | ||
35 | static 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 | ||
46 | static 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 | ||
57 | static 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 | ||
68 | static 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 | ||
75 | static struct reset_syscfg *st_restart_syscfg; | |
76 | ||
453fe4f1 GR |
77 | static int st_restart(struct notifier_block *this, unsigned long mode, |
78 | void *cmd) | |
f0745f36 LJ |
79 | { |
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); | |
453fe4f1 GR |
91 | |
92 | return NOTIFY_DONE; | |
f0745f36 LJ |
93 | } |
94 | ||
453fe4f1 GR |
95 | static struct notifier_block st_restart_nb = { |
96 | .notifier_call = st_restart, | |
97 | .priority = 192, | |
98 | }; | |
99 | ||
8fb08855 | 100 | static const struct of_device_id st_reset_of_match[] = { |
f0745f36 LJ |
101 | { |
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 | ||
117 | static 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 | ||
453fe4f1 | 136 | return register_restart_handler(&st_restart_nb); |
f0745f36 LJ |
137 | } |
138 | ||
139 | static 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 | ||
147 | static int __init st_reset_init(void) | |
148 | { | |
149 | return platform_driver_register(&st_reset_driver); | |
150 | } | |
151 | ||
152 | device_initcall(st_reset_init); | |
153 | ||
154 | MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>"); | |
155 | MODULE_DESCRIPTION("STMicroelectronics Power off Restart driver"); | |
156 | MODULE_LICENSE("GPL v2"); |