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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
4fcd504e AY |
2 | /* |
3 | * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd | |
4fcd504e AY |
4 | */ |
5 | ||
6 | #include <linux/init.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/of.h> | |
10 | #include <linux/platform_device.h> | |
11 | #include <linux/reboot.h> | |
12 | #include <linux/regmap.h> | |
13 | #include <linux/mfd/syscon.h> | |
f1bea879 | 14 | #include <linux/reboot-mode.h> |
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15 | |
16 | struct syscon_reboot_mode { | |
17 | struct regmap *map; | |
18 | struct reboot_mode_driver reboot; | |
19 | u32 offset; | |
20 | u32 mask; | |
21 | }; | |
22 | ||
23 | static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot, | |
24 | unsigned int magic) | |
25 | { | |
26 | struct syscon_reboot_mode *syscon_rbm; | |
27 | int ret; | |
28 | ||
29 | syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot); | |
30 | ||
31 | ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset, | |
32 | syscon_rbm->mask, magic); | |
33 | if (ret < 0) | |
34 | dev_err(reboot->dev, "update reboot mode bits failed\n"); | |
35 | ||
36 | return ret; | |
37 | } | |
38 | ||
39 | static int syscon_reboot_mode_probe(struct platform_device *pdev) | |
40 | { | |
41 | int ret; | |
42 | struct syscon_reboot_mode *syscon_rbm; | |
43 | ||
44 | syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL); | |
45 | if (!syscon_rbm) | |
46 | return -ENOMEM; | |
47 | ||
48 | syscon_rbm->reboot.dev = &pdev->dev; | |
49 | syscon_rbm->reboot.write = syscon_reboot_mode_write; | |
50 | syscon_rbm->mask = 0xffffffff; | |
51 | ||
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52 | syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node); |
53 | if (IS_ERR(syscon_rbm->map)) | |
54 | return PTR_ERR(syscon_rbm->map); | |
55 | ||
56 | if (of_property_read_u32(pdev->dev.of_node, "offset", | |
57 | &syscon_rbm->offset)) | |
58 | return -EINVAL; | |
59 | ||
60 | of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask); | |
61 | ||
8dfdd2a8 | 62 | ret = devm_reboot_mode_register(&pdev->dev, &syscon_rbm->reboot); |
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63 | if (ret) |
64 | dev_err(&pdev->dev, "can't register reboot mode\n"); | |
65 | ||
66 | return ret; | |
67 | } | |
68 | ||
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69 | static const struct of_device_id syscon_reboot_mode_of_match[] = { |
70 | { .compatible = "syscon-reboot-mode" }, | |
71 | {} | |
72 | }; | |
0a27aa9c | 73 | MODULE_DEVICE_TABLE(of, syscon_reboot_mode_of_match); |
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74 | |
75 | static struct platform_driver syscon_reboot_mode_driver = { | |
76 | .probe = syscon_reboot_mode_probe, | |
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77 | .driver = { |
78 | .name = "syscon-reboot-mode", | |
79 | .of_match_table = syscon_reboot_mode_of_match, | |
80 | }, | |
81 | }; | |
82 | module_platform_driver(syscon_reboot_mode_driver); | |
83 | ||
84 | MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com"); | |
85 | MODULE_DESCRIPTION("SYSCON reboot mode driver"); | |
86 | MODULE_LICENSE("GPL v2"); |