Commit | Line | Data |
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d633fb7a SH |
1 | /* |
2 | * Copyright (c) 2014 MediaTek Inc. | |
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 version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/mfd/syscon.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/regmap.h> | |
19 | #include <linux/reset-controller.h> | |
20 | #include <linux/slab.h> | |
21 | ||
22 | #include "clk-mtk.h" | |
23 | ||
24 | struct mtk_reset { | |
25 | struct regmap *regmap; | |
26 | int regofs; | |
27 | struct reset_controller_dev rcdev; | |
28 | }; | |
29 | ||
30 | static int mtk_reset_assert(struct reset_controller_dev *rcdev, | |
31 | unsigned long id) | |
32 | { | |
33 | struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev); | |
34 | ||
35 | return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2), | |
36 | BIT(id % 32), ~0); | |
37 | } | |
38 | ||
39 | static int mtk_reset_deassert(struct reset_controller_dev *rcdev, | |
40 | unsigned long id) | |
41 | { | |
42 | struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev); | |
43 | ||
44 | return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2), | |
45 | BIT(id % 32), 0); | |
46 | } | |
47 | ||
48 | static int mtk_reset(struct reset_controller_dev *rcdev, | |
49 | unsigned long id) | |
50 | { | |
51 | int ret; | |
52 | ||
53 | ret = mtk_reset_assert(rcdev, id); | |
54 | if (ret) | |
55 | return ret; | |
56 | ||
57 | return mtk_reset_deassert(rcdev, id); | |
58 | } | |
59 | ||
60 | static struct reset_control_ops mtk_reset_ops = { | |
61 | .assert = mtk_reset_assert, | |
62 | .deassert = mtk_reset_deassert, | |
63 | .reset = mtk_reset, | |
64 | }; | |
65 | ||
66 | void mtk_register_reset_controller(struct device_node *np, | |
67 | unsigned int num_regs, int regofs) | |
68 | { | |
69 | struct mtk_reset *data; | |
70 | int ret; | |
71 | struct regmap *regmap; | |
72 | ||
73 | regmap = syscon_node_to_regmap(np); | |
74 | if (IS_ERR(regmap)) { | |
75 | pr_err("Cannot find regmap for %s: %ld\n", np->full_name, | |
76 | PTR_ERR(regmap)); | |
77 | return; | |
78 | } | |
79 | ||
80 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
81 | if (!data) | |
82 | return; | |
83 | ||
84 | data->regmap = regmap; | |
85 | data->regofs = regofs; | |
86 | data->rcdev.owner = THIS_MODULE; | |
87 | data->rcdev.nr_resets = num_regs * 32; | |
88 | data->rcdev.ops = &mtk_reset_ops; | |
89 | data->rcdev.of_node = np; | |
90 | ||
91 | ret = reset_controller_register(&data->rcdev); | |
92 | if (ret) { | |
93 | pr_err("could not register reset controller: %d\n", ret); | |
94 | kfree(data); | |
95 | return; | |
96 | } | |
97 | } |