1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Amlogic Meson Reset Controller driver
4 *
5 * Copyright (c) 2016-2024 BayLibre, SAS.
6 * Authors: Neil Armstrong <narmstrong@baylibre.com>
7 * Jerome Brunet <jbrunet@baylibre.com>
8 */
9
10#include <linux/err.h>
11#include <linux/io.h>
12#include <linux/of.h>
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/regmap.h>
16#include <linux/reset-controller.h>
17
18#include "reset-meson.h"
19
20static const struct meson_reset_param meson8b_param = {
21 .reset_ops = &meson_reset_ops,
22 .reset_num = 256,
23 .reset_offset = 0x0,
24 .level_offset = 0x7c,
25 .level_low_reset = true,
26};
27
28static const struct meson_reset_param meson_a1_param = {
29 .reset_ops = &meson_reset_ops,
30 .reset_num = 96,
31 .reset_offset = 0x0,
32 .level_offset = 0x40,
33 .level_low_reset = true,
34};
35
36static const struct meson_reset_param meson_s4_param = {
37 .reset_ops = &meson_reset_ops,
38 .reset_num = 192,
39 .reset_offset = 0x0,
40 .level_offset = 0x40,
41 .level_low_reset = true,
42};
43
44static const struct meson_reset_param t7_param = {
45 .reset_num = 224,
46 .reset_offset = 0x0,
47 .level_offset = 0x40,
48 .level_low_reset = true,
49};
50
51static const struct of_device_id meson_reset_dt_ids[] = {
52 { .compatible = "amlogic,meson8b-reset", .data = &meson8b_param},
53 { .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param},
54 { .compatible = "amlogic,meson-axg-reset", .data = &meson8b_param},
55 { .compatible = "amlogic,meson-a1-reset", .data = &meson_a1_param},
56 { .compatible = "amlogic,meson-s4-reset", .data = &meson_s4_param},
57 { .compatible = "amlogic,c3-reset", .data = &meson_s4_param},
58 { .compatible = "amlogic,t7-reset", .data = &t7_param},
59 { /* sentinel */ },
60};
61MODULE_DEVICE_TABLE(of, meson_reset_dt_ids);
62
63static const struct regmap_config regmap_config = {
64 .reg_bits = 32,
65 .val_bits = 32,
66 .reg_stride = 4,
67};
68
69static int meson_reset_probe(struct platform_device *pdev)
70{
71 const struct meson_reset_param *param;
72 struct device *dev = &pdev->dev;
73 struct regmap *map;
74 void __iomem *base;
75
76 base = devm_platform_ioremap_resource(pdev, index: 0);
77 if (IS_ERR(ptr: base))
78 return PTR_ERR(ptr: base);
79
80 param = device_get_match_data(dev);
81 if (!param)
82 return -ENODEV;
83
84 map = devm_regmap_init_mmio(dev, base, &regmap_config);
85 if (IS_ERR(ptr: map))
86 return dev_err_probe(dev, err: PTR_ERR(ptr: map),
87 fmt: "can't init regmap mmio region\n");
88
89 return meson_reset_controller_register(dev, map, param);
90}
91
92static struct platform_driver meson_reset_driver = {
93 .probe = meson_reset_probe,
94 .driver = {
95 .name = "meson_reset",
96 .of_match_table = meson_reset_dt_ids,
97 },
98};
99module_platform_driver(meson_reset_driver);
100
101MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
102MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
103MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
104MODULE_LICENSE("Dual BSD/GPL");
105MODULE_IMPORT_NS("MESON_RESET");
106

source code of linux/drivers/reset/amlogic/reset-meson.c