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2aec85b2 TG |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | // Copyright (C) 2013 Broadcom Corporation | |
030494e7 | 3 | |
bb1de7f6 | 4 | #include <linux/bitops.h> |
030494e7 MC |
5 | #include <linux/device.h> |
6 | #include <linux/errno.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/io.h> | |
9 | #include <linux/jiffies.h> | |
6136c41a | 10 | #include <linux/notifier.h> |
030494e7 MC |
11 | #include <linux/of_address.h> |
12 | #include <linux/of_irq.h> | |
13 | #include <linux/of_platform.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/printk.h> | |
16 | #include <linux/reboot.h> | |
17 | #include <linux/regmap.h> | |
18 | #include <linux/smp.h> | |
19 | #include <linux/mfd/syscon.h> | |
20 | ||
030494e7 MC |
21 | #define RESET_SOURCE_ENABLE_REG 1 |
22 | #define SW_MASTER_RESET_REG 2 | |
23 | ||
24 | static struct regmap *regmap; | |
25 | static u32 rst_src_en; | |
26 | static u32 sw_mstr_rst; | |
27 | ||
bb1de7f6 KC |
28 | struct reset_reg_mask { |
29 | u32 rst_src_en_mask; | |
30 | u32 sw_mstr_rst_mask; | |
31 | }; | |
32 | ||
33 | static const struct reset_reg_mask *reset_masks; | |
34 | ||
6136c41a GR |
35 | static int brcmstb_restart_handler(struct notifier_block *this, |
36 | unsigned long mode, void *cmd) | |
030494e7 MC |
37 | { |
38 | int rc; | |
39 | u32 tmp; | |
40 | ||
bb1de7f6 | 41 | rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask); |
030494e7 MC |
42 | if (rc) { |
43 | pr_err("failed to write rst_src_en (%d)\n", rc); | |
6136c41a | 44 | return NOTIFY_DONE; |
030494e7 MC |
45 | } |
46 | ||
47 | rc = regmap_read(regmap, rst_src_en, &tmp); | |
48 | if (rc) { | |
49 | pr_err("failed to read rst_src_en (%d)\n", rc); | |
6136c41a | 50 | return NOTIFY_DONE; |
030494e7 MC |
51 | } |
52 | ||
bb1de7f6 | 53 | rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask); |
030494e7 MC |
54 | if (rc) { |
55 | pr_err("failed to write sw_mstr_rst (%d)\n", rc); | |
6136c41a | 56 | return NOTIFY_DONE; |
030494e7 MC |
57 | } |
58 | ||
59 | rc = regmap_read(regmap, sw_mstr_rst, &tmp); | |
60 | if (rc) { | |
61 | pr_err("failed to read sw_mstr_rst (%d)\n", rc); | |
6136c41a | 62 | return NOTIFY_DONE; |
030494e7 MC |
63 | } |
64 | ||
65 | while (1) | |
66 | ; | |
6136c41a GR |
67 | |
68 | return NOTIFY_DONE; | |
030494e7 MC |
69 | } |
70 | ||
6136c41a GR |
71 | static struct notifier_block brcmstb_restart_nb = { |
72 | .notifier_call = brcmstb_restart_handler, | |
73 | .priority = 128, | |
74 | }; | |
75 | ||
bb1de7f6 KC |
76 | static const struct reset_reg_mask reset_bits_40nm = { |
77 | .rst_src_en_mask = BIT(0), | |
78 | .sw_mstr_rst_mask = BIT(0), | |
79 | }; | |
80 | ||
79969f6a KC |
81 | static const struct reset_reg_mask reset_bits_65nm = { |
82 | .rst_src_en_mask = BIT(3), | |
83 | .sw_mstr_rst_mask = BIT(31), | |
84 | }; | |
85 | ||
bb1de7f6 KC |
86 | static const struct of_device_id of_match[] = { |
87 | { .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm }, | |
79969f6a | 88 | { .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm }, |
bb1de7f6 KC |
89 | {}, |
90 | }; | |
91 | ||
030494e7 MC |
92 | static int brcmstb_reboot_probe(struct platform_device *pdev) |
93 | { | |
94 | int rc; | |
95 | struct device_node *np = pdev->dev.of_node; | |
bb1de7f6 KC |
96 | const struct of_device_id *of_id; |
97 | ||
98 | of_id = of_match_node(of_match, np); | |
99 | if (!of_id) { | |
100 | pr_err("failed to look up compatible string\n"); | |
101 | return -EINVAL; | |
102 | } | |
103 | reset_masks = of_id->data; | |
030494e7 MC |
104 | |
105 | regmap = syscon_regmap_lookup_by_phandle(np, "syscon"); | |
106 | if (IS_ERR(regmap)) { | |
107 | pr_err("failed to get syscon phandle\n"); | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG, | |
112 | &rst_src_en); | |
113 | if (rc) { | |
114 | pr_err("can't get rst_src_en offset (%d)\n", rc); | |
115 | return -EINVAL; | |
116 | } | |
117 | ||
118 | rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG, | |
119 | &sw_mstr_rst); | |
120 | if (rc) { | |
121 | pr_err("can't get sw_mstr_rst offset (%d)\n", rc); | |
122 | return -EINVAL; | |
123 | } | |
124 | ||
6136c41a GR |
125 | rc = register_restart_handler(&brcmstb_restart_nb); |
126 | if (rc) | |
127 | dev_err(&pdev->dev, | |
128 | "cannot register restart handler (err=%d)\n", rc); | |
030494e7 | 129 | |
6136c41a | 130 | return rc; |
030494e7 MC |
131 | } |
132 | ||
030494e7 MC |
133 | static struct platform_driver brcmstb_reboot_driver = { |
134 | .probe = brcmstb_reboot_probe, | |
135 | .driver = { | |
136 | .name = "brcmstb-reboot", | |
030494e7 MC |
137 | .of_match_table = of_match, |
138 | }, | |
139 | }; | |
140 | ||
141 | static int __init brcmstb_reboot_init(void) | |
142 | { | |
143 | return platform_driver_probe(&brcmstb_reboot_driver, | |
144 | brcmstb_reboot_probe); | |
145 | } | |
146 | subsys_initcall(brcmstb_reboot_init); |