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4fcd504e AY |
1 | /* |
2 | * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/of.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/reboot.h> | |
16 | #include <linux/regmap.h> | |
17 | #include <linux/mfd/syscon.h> | |
18 | #include "reboot-mode.h" | |
19 | ||
20 | struct syscon_reboot_mode { | |
21 | struct regmap *map; | |
22 | struct reboot_mode_driver reboot; | |
23 | u32 offset; | |
24 | u32 mask; | |
25 | }; | |
26 | ||
27 | static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot, | |
28 | unsigned int magic) | |
29 | { | |
30 | struct syscon_reboot_mode *syscon_rbm; | |
31 | int ret; | |
32 | ||
33 | syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot); | |
34 | ||
35 | ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset, | |
36 | syscon_rbm->mask, magic); | |
37 | if (ret < 0) | |
38 | dev_err(reboot->dev, "update reboot mode bits failed\n"); | |
39 | ||
40 | return ret; | |
41 | } | |
42 | ||
43 | static int syscon_reboot_mode_probe(struct platform_device *pdev) | |
44 | { | |
45 | int ret; | |
46 | struct syscon_reboot_mode *syscon_rbm; | |
47 | ||
48 | syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL); | |
49 | if (!syscon_rbm) | |
50 | return -ENOMEM; | |
51 | ||
52 | syscon_rbm->reboot.dev = &pdev->dev; | |
53 | syscon_rbm->reboot.write = syscon_reboot_mode_write; | |
54 | syscon_rbm->mask = 0xffffffff; | |
55 | ||
4fcd504e AY |
56 | syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node); |
57 | if (IS_ERR(syscon_rbm->map)) | |
58 | return PTR_ERR(syscon_rbm->map); | |
59 | ||
60 | if (of_property_read_u32(pdev->dev.of_node, "offset", | |
61 | &syscon_rbm->offset)) | |
62 | return -EINVAL; | |
63 | ||
64 | of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask); | |
65 | ||
8dfdd2a8 | 66 | ret = devm_reboot_mode_register(&pdev->dev, &syscon_rbm->reboot); |
4fcd504e AY |
67 | if (ret) |
68 | dev_err(&pdev->dev, "can't register reboot mode\n"); | |
69 | ||
70 | return ret; | |
71 | } | |
72 | ||
4fcd504e AY |
73 | static const struct of_device_id syscon_reboot_mode_of_match[] = { |
74 | { .compatible = "syscon-reboot-mode" }, | |
75 | {} | |
76 | }; | |
77 | ||
78 | static struct platform_driver syscon_reboot_mode_driver = { | |
79 | .probe = syscon_reboot_mode_probe, | |
4fcd504e AY |
80 | .driver = { |
81 | .name = "syscon-reboot-mode", | |
82 | .of_match_table = syscon_reboot_mode_of_match, | |
83 | }, | |
84 | }; | |
85 | module_platform_driver(syscon_reboot_mode_driver); | |
86 | ||
87 | MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com"); | |
88 | MODULE_DESCRIPTION("SYSCON reboot mode driver"); | |
89 | MODULE_LICENSE("GPL v2"); |