Commit | Line | Data |
---|---|---|
f59d23c2 CF |
1 | /* |
2 | * Hisilicon Hi6220 reset controller driver | |
3 | * | |
4 | * Copyright (c) 2015 Hisilicon Limited. | |
5 | * | |
6 | * Author: Feng Chen <puck.chen@hisilicon.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/io.h> | |
14 | #include <linux/init.h> | |
70b3590f | 15 | #include <linux/module.h> |
f59d23c2 CF |
16 | #include <linux/bitops.h> |
17 | #include <linux/of.h> | |
18 | #include <linux/reset-controller.h> | |
19 | #include <linux/reset.h> | |
20 | #include <linux/platform_device.h> | |
21 | ||
22 | #define ASSERT_OFFSET 0x300 | |
23 | #define DEASSERT_OFFSET 0x304 | |
24 | #define MAX_INDEX 0x509 | |
25 | ||
26 | #define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev) | |
27 | ||
28 | struct hi6220_reset_data { | |
29 | void __iomem *assert_base; | |
30 | void __iomem *deassert_base; | |
31 | struct reset_controller_dev rc_dev; | |
32 | }; | |
33 | ||
34 | static int hi6220_reset_assert(struct reset_controller_dev *rc_dev, | |
35 | unsigned long idx) | |
36 | { | |
37 | struct hi6220_reset_data *data = to_reset_data(rc_dev); | |
38 | ||
39 | int bank = idx >> 8; | |
40 | int offset = idx & 0xff; | |
41 | ||
42 | writel(BIT(offset), data->assert_base + (bank * 0x10)); | |
43 | ||
44 | return 0; | |
45 | } | |
46 | ||
47 | static int hi6220_reset_deassert(struct reset_controller_dev *rc_dev, | |
48 | unsigned long idx) | |
49 | { | |
50 | struct hi6220_reset_data *data = to_reset_data(rc_dev); | |
51 | ||
52 | int bank = idx >> 8; | |
53 | int offset = idx & 0xff; | |
54 | ||
55 | writel(BIT(offset), data->deassert_base + (bank * 0x10)); | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | static struct reset_control_ops hi6220_reset_ops = { | |
61 | .assert = hi6220_reset_assert, | |
62 | .deassert = hi6220_reset_deassert, | |
63 | }; | |
64 | ||
65 | static int hi6220_reset_probe(struct platform_device *pdev) | |
66 | { | |
67 | struct hi6220_reset_data *data; | |
68 | struct resource *res; | |
69 | void __iomem *src_base; | |
70 | ||
71 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
72 | if (!data) | |
73 | return -ENOMEM; | |
74 | ||
75 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
76 | src_base = devm_ioremap_resource(&pdev->dev, res); | |
77 | if (IS_ERR(src_base)) | |
78 | return PTR_ERR(src_base); | |
79 | ||
80 | data->assert_base = src_base + ASSERT_OFFSET; | |
81 | data->deassert_base = src_base + DEASSERT_OFFSET; | |
82 | data->rc_dev.nr_resets = MAX_INDEX; | |
83 | data->rc_dev.ops = &hi6220_reset_ops; | |
84 | data->rc_dev.of_node = pdev->dev.of_node; | |
85 | ||
86 | reset_controller_register(&data->rc_dev); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static const struct of_device_id hi6220_reset_match[] = { | |
92 | { .compatible = "hisilicon,hi6220-sysctrl" }, | |
93 | { }, | |
94 | }; | |
95 | ||
96 | static struct platform_driver hi6220_reset_driver = { | |
97 | .probe = hi6220_reset_probe, | |
98 | .driver = { | |
99 | .name = "reset-hi6220", | |
100 | .of_match_table = hi6220_reset_match, | |
101 | }, | |
102 | }; | |
103 | ||
104 | static int __init hi6220_reset_init(void) | |
105 | { | |
106 | return platform_driver_register(&hi6220_reset_driver); | |
107 | } | |
108 | ||
109 | postcore_initcall(hi6220_reset_init); |