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030494e7 MC |
1 | /* |
2 | * Copyright (C) 2013 Broadcom Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License as | |
6 | * published by the Free Software Foundation version 2. | |
7 | * | |
8 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
9 | * kind, whether express or implied; without even the implied warranty | |
10 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
bb1de7f6 | 14 | #include <linux/bitops.h> |
030494e7 MC |
15 | #include <linux/device.h> |
16 | #include <linux/errno.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/jiffies.h> | |
6136c41a | 20 | #include <linux/notifier.h> |
030494e7 MC |
21 | #include <linux/of_address.h> |
22 | #include <linux/of_irq.h> | |
23 | #include <linux/of_platform.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/printk.h> | |
26 | #include <linux/reboot.h> | |
27 | #include <linux/regmap.h> | |
28 | #include <linux/smp.h> | |
29 | #include <linux/mfd/syscon.h> | |
30 | ||
030494e7 MC |
31 | #define RESET_SOURCE_ENABLE_REG 1 |
32 | #define SW_MASTER_RESET_REG 2 | |
33 | ||
34 | static struct regmap *regmap; | |
35 | static u32 rst_src_en; | |
36 | static u32 sw_mstr_rst; | |
37 | ||
bb1de7f6 KC |
38 | struct reset_reg_mask { |
39 | u32 rst_src_en_mask; | |
40 | u32 sw_mstr_rst_mask; | |
41 | }; | |
42 | ||
43 | static const struct reset_reg_mask *reset_masks; | |
44 | ||
6136c41a GR |
45 | static int brcmstb_restart_handler(struct notifier_block *this, |
46 | unsigned long mode, void *cmd) | |
030494e7 MC |
47 | { |
48 | int rc; | |
49 | u32 tmp; | |
50 | ||
bb1de7f6 | 51 | rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask); |
030494e7 MC |
52 | if (rc) { |
53 | pr_err("failed to write rst_src_en (%d)\n", rc); | |
6136c41a | 54 | return NOTIFY_DONE; |
030494e7 MC |
55 | } |
56 | ||
57 | rc = regmap_read(regmap, rst_src_en, &tmp); | |
58 | if (rc) { | |
59 | pr_err("failed to read rst_src_en (%d)\n", rc); | |
6136c41a | 60 | return NOTIFY_DONE; |
030494e7 MC |
61 | } |
62 | ||
bb1de7f6 | 63 | rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask); |
030494e7 MC |
64 | if (rc) { |
65 | pr_err("failed to write sw_mstr_rst (%d)\n", rc); | |
6136c41a | 66 | return NOTIFY_DONE; |
030494e7 MC |
67 | } |
68 | ||
69 | rc = regmap_read(regmap, sw_mstr_rst, &tmp); | |
70 | if (rc) { | |
71 | pr_err("failed to read sw_mstr_rst (%d)\n", rc); | |
6136c41a | 72 | return NOTIFY_DONE; |
030494e7 MC |
73 | } |
74 | ||
75 | while (1) | |
76 | ; | |
6136c41a GR |
77 | |
78 | return NOTIFY_DONE; | |
030494e7 MC |
79 | } |
80 | ||
6136c41a GR |
81 | static struct notifier_block brcmstb_restart_nb = { |
82 | .notifier_call = brcmstb_restart_handler, | |
83 | .priority = 128, | |
84 | }; | |
85 | ||
bb1de7f6 KC |
86 | static const struct reset_reg_mask reset_bits_40nm = { |
87 | .rst_src_en_mask = BIT(0), | |
88 | .sw_mstr_rst_mask = BIT(0), | |
89 | }; | |
90 | ||
79969f6a KC |
91 | static const struct reset_reg_mask reset_bits_65nm = { |
92 | .rst_src_en_mask = BIT(3), | |
93 | .sw_mstr_rst_mask = BIT(31), | |
94 | }; | |
95 | ||
bb1de7f6 KC |
96 | static const struct of_device_id of_match[] = { |
97 | { .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm }, | |
79969f6a | 98 | { .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm }, |
bb1de7f6 KC |
99 | {}, |
100 | }; | |
101 | ||
030494e7 MC |
102 | static int brcmstb_reboot_probe(struct platform_device *pdev) |
103 | { | |
104 | int rc; | |
105 | struct device_node *np = pdev->dev.of_node; | |
bb1de7f6 KC |
106 | const struct of_device_id *of_id; |
107 | ||
108 | of_id = of_match_node(of_match, np); | |
109 | if (!of_id) { | |
110 | pr_err("failed to look up compatible string\n"); | |
111 | return -EINVAL; | |
112 | } | |
113 | reset_masks = of_id->data; | |
030494e7 MC |
114 | |
115 | regmap = syscon_regmap_lookup_by_phandle(np, "syscon"); | |
116 | if (IS_ERR(regmap)) { | |
117 | pr_err("failed to get syscon phandle\n"); | |
118 | return -EINVAL; | |
119 | } | |
120 | ||
121 | rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG, | |
122 | &rst_src_en); | |
123 | if (rc) { | |
124 | pr_err("can't get rst_src_en offset (%d)\n", rc); | |
125 | return -EINVAL; | |
126 | } | |
127 | ||
128 | rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG, | |
129 | &sw_mstr_rst); | |
130 | if (rc) { | |
131 | pr_err("can't get sw_mstr_rst offset (%d)\n", rc); | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
6136c41a GR |
135 | rc = register_restart_handler(&brcmstb_restart_nb); |
136 | if (rc) | |
137 | dev_err(&pdev->dev, | |
138 | "cannot register restart handler (err=%d)\n", rc); | |
030494e7 | 139 | |
6136c41a | 140 | return rc; |
030494e7 MC |
141 | } |
142 | ||
030494e7 MC |
143 | static struct platform_driver brcmstb_reboot_driver = { |
144 | .probe = brcmstb_reboot_probe, | |
145 | .driver = { | |
146 | .name = "brcmstb-reboot", | |
030494e7 MC |
147 | .of_match_table = of_match, |
148 | }, | |
149 | }; | |
150 | ||
151 | static int __init brcmstb_reboot_init(void) | |
152 | { | |
153 | return platform_driver_probe(&brcmstb_reboot_driver, | |
154 | brcmstb_reboot_probe); | |
155 | } | |
156 | subsys_initcall(brcmstb_reboot_init); |