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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * drivers/reset/reset-oxnas.c | |
4 | * | |
5 | * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com> | |
6 | * Copyright (C) 2014 Ma Haijun <mahaijuns@gmail.com> | |
7 | * Copyright (C) 2009 Oxford Semiconductor Ltd | |
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8 | */ |
9 | #include <linux/err.h> | |
80b8b1a1 | 10 | #include <linux/init.h> |
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11 | #include <linux/of.h> |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/reset-controller.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/regmap.h> | |
18 | #include <linux/mfd/syscon.h> | |
19 | ||
20 | /* Regmap offsets */ | |
21 | #define RST_SET_REGOFFSET 0x34 | |
22 | #define RST_CLR_REGOFFSET 0x38 | |
23 | ||
24 | struct oxnas_reset { | |
25 | struct regmap *regmap; | |
26 | struct reset_controller_dev rcdev; | |
27 | }; | |
28 | ||
29 | static int oxnas_reset_reset(struct reset_controller_dev *rcdev, | |
30 | unsigned long id) | |
31 | { | |
32 | struct oxnas_reset *data = | |
33 | container_of(rcdev, struct oxnas_reset, rcdev); | |
34 | ||
35 | regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id)); | |
36 | msleep(50); | |
37 | regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id)); | |
38 | ||
39 | return 0; | |
40 | } | |
41 | ||
42 | static int oxnas_reset_assert(struct reset_controller_dev *rcdev, | |
43 | unsigned long id) | |
44 | { | |
45 | struct oxnas_reset *data = | |
46 | container_of(rcdev, struct oxnas_reset, rcdev); | |
47 | ||
48 | regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id)); | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static int oxnas_reset_deassert(struct reset_controller_dev *rcdev, | |
54 | unsigned long id) | |
55 | { | |
56 | struct oxnas_reset *data = | |
57 | container_of(rcdev, struct oxnas_reset, rcdev); | |
58 | ||
59 | regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id)); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | static const struct reset_control_ops oxnas_reset_ops = { | |
65 | .reset = oxnas_reset_reset, | |
66 | .assert = oxnas_reset_assert, | |
67 | .deassert = oxnas_reset_deassert, | |
68 | }; | |
69 | ||
70 | static const struct of_device_id oxnas_reset_dt_ids[] = { | |
71 | { .compatible = "oxsemi,ox810se-reset", }, | |
a68262bb | 72 | { .compatible = "oxsemi,ox820-reset", }, |
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73 | { /* sentinel */ }, |
74 | }; | |
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75 | |
76 | static int oxnas_reset_probe(struct platform_device *pdev) | |
77 | { | |
78 | struct oxnas_reset *data; | |
79 | struct device *parent; | |
80 | ||
81 | parent = pdev->dev.parent; | |
82 | if (!parent) { | |
83 | dev_err(&pdev->dev, "no parent\n"); | |
84 | return -ENODEV; | |
85 | } | |
86 | ||
87 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
88 | if (!data) | |
89 | return -ENOMEM; | |
90 | ||
91 | data->regmap = syscon_node_to_regmap(parent->of_node); | |
92 | if (IS_ERR(data->regmap)) { | |
93 | dev_err(&pdev->dev, "failed to get parent regmap\n"); | |
94 | return PTR_ERR(data->regmap); | |
95 | } | |
96 | ||
97 | platform_set_drvdata(pdev, data); | |
98 | ||
99 | data->rcdev.owner = THIS_MODULE; | |
100 | data->rcdev.nr_resets = 32; | |
101 | data->rcdev.ops = &oxnas_reset_ops; | |
102 | data->rcdev.of_node = pdev->dev.of_node; | |
103 | ||
42fa905b | 104 | return devm_reset_controller_register(&pdev->dev, &data->rcdev); |
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105 | } |
106 | ||
107 | static struct platform_driver oxnas_reset_driver = { | |
108 | .probe = oxnas_reset_probe, | |
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109 | .driver = { |
110 | .name = "oxnas-reset", | |
111 | .of_match_table = oxnas_reset_dt_ids, | |
112 | }, | |
113 | }; | |
80b8b1a1 | 114 | builtin_platform_driver(oxnas_reset_driver); |