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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // Copyright (c) 2020 MediaTek Inc. |
4 | |
5 | #include <linux/err.h> |
6 | #include <linux/init.h> |
7 | #include <linux/module.h> |
8 | #include <linux/platform_device.h> |
9 | #include <linux/of_device.h> |
10 | #include <linux/of_platform.h> |
11 | #include <linux/regulator/driver.h> |
12 | #include <linux/regulator/of_regulator.h> |
13 | #include <linux/soc/mediatek/mtk_dvfsrc.h> |
14 | |
15 | #define DVFSRC_ID_VCORE 0 |
16 | #define DVFSRC_ID_VSCP 1 |
17 | |
18 | #define MT_DVFSRC_REGULAR(match, _name, _volt_table) \ |
19 | [DVFSRC_ID_##_name] = { \ |
20 | .desc = { \ |
21 | .name = match, \ |
22 | .of_match = of_match_ptr(match), \ |
23 | .ops = &dvfsrc_vcore_ops, \ |
24 | .type = REGULATOR_VOLTAGE, \ |
25 | .id = DVFSRC_ID_##_name, \ |
26 | .owner = THIS_MODULE, \ |
27 | .n_voltages = ARRAY_SIZE(_volt_table), \ |
28 | .volt_table = _volt_table, \ |
29 | }, \ |
30 | } |
31 | |
32 | /* |
33 | * DVFSRC regulators' information |
34 | * |
35 | * @desc: standard fields of regulator description. |
36 | * @voltage_selector: Selector used for get_voltage_sel() and |
37 | * set_voltage_sel() callbacks |
38 | */ |
39 | |
40 | struct dvfsrc_regulator { |
41 | struct regulator_desc desc; |
42 | }; |
43 | |
44 | /* |
45 | * MTK DVFSRC regulators' init data |
46 | * |
47 | * @size: num of regulators |
48 | * @regulator_info: regulator info. |
49 | */ |
50 | struct dvfsrc_regulator_init_data { |
51 | u32 size; |
52 | struct dvfsrc_regulator *regulator_info; |
53 | }; |
54 | |
55 | static inline struct device *to_dvfsrc_dev(struct regulator_dev *rdev) |
56 | { |
57 | return rdev_get_dev(rdev)->parent; |
58 | } |
59 | |
60 | static int dvfsrc_set_voltage_sel(struct regulator_dev *rdev, |
61 | unsigned int selector) |
62 | { |
63 | struct device *dvfsrc_dev = to_dvfsrc_dev(rdev); |
64 | int id = rdev_get_id(rdev); |
65 | |
66 | if (id == DVFSRC_ID_VCORE) |
67 | mtk_dvfsrc_send_request(dvfsrc_dev, |
68 | MTK_DVFSRC_CMD_VCORE_REQUEST, |
69 | selector); |
70 | else if (id == DVFSRC_ID_VSCP) |
71 | mtk_dvfsrc_send_request(dvfsrc_dev, |
72 | MTK_DVFSRC_CMD_VSCP_REQUEST, |
73 | selector); |
74 | else |
75 | return -EINVAL; |
76 | |
77 | return 0; |
78 | } |
79 | |
80 | static int dvfsrc_get_voltage_sel(struct regulator_dev *rdev) |
81 | { |
82 | struct device *dvfsrc_dev = to_dvfsrc_dev(rdev); |
83 | int id = rdev_get_id(rdev); |
84 | int val, ret; |
85 | |
86 | if (id == DVFSRC_ID_VCORE) |
87 | ret = mtk_dvfsrc_query_info(dvfsrc_dev, |
88 | MTK_DVFSRC_CMD_VCORE_LEVEL_QUERY, |
89 | &val); |
90 | else if (id == DVFSRC_ID_VSCP) |
91 | ret = mtk_dvfsrc_query_info(dvfsrc_dev, |
92 | MTK_DVFSRC_CMD_VSCP_LEVEL_QUERY, |
93 | &val); |
94 | else |
95 | return -EINVAL; |
96 | |
97 | if (ret != 0) |
98 | return ret; |
99 | |
100 | return val; |
101 | } |
102 | |
103 | static const struct regulator_ops dvfsrc_vcore_ops = { |
104 | .list_voltage = regulator_list_voltage_table, |
105 | .get_voltage_sel = dvfsrc_get_voltage_sel, |
106 | .set_voltage_sel = dvfsrc_set_voltage_sel, |
107 | }; |
108 | |
109 | static const unsigned int mt8183_voltages[] = { |
110 | 725000, |
111 | 800000, |
112 | }; |
113 | |
114 | static struct dvfsrc_regulator mt8183_regulators[] = { |
115 | MT_DVFSRC_REGULAR("dvfsrc-vcore", VCORE, |
116 | mt8183_voltages), |
117 | }; |
118 | |
119 | static const struct dvfsrc_regulator_init_data regulator_mt8183_data = { |
120 | .size = ARRAY_SIZE(mt8183_regulators), |
121 | .regulator_info = &mt8183_regulators[0], |
122 | }; |
123 | |
124 | static const unsigned int mt6873_voltages[] = { |
125 | 575000, |
126 | 600000, |
127 | 650000, |
128 | 725000, |
129 | }; |
130 | |
131 | static struct dvfsrc_regulator mt6873_regulators[] = { |
132 | MT_DVFSRC_REGULAR("dvfsrc-vcore", VCORE, |
133 | mt6873_voltages), |
134 | MT_DVFSRC_REGULAR("dvfsrc-vscp", VSCP, |
135 | mt6873_voltages), |
136 | }; |
137 | |
138 | static const struct dvfsrc_regulator_init_data regulator_mt6873_data = { |
139 | .size = ARRAY_SIZE(mt6873_regulators), |
140 | .regulator_info = &mt6873_regulators[0], |
141 | }; |
142 | |
143 | static const struct of_device_id mtk_dvfsrc_regulator_match[] = { |
144 | { |
145 | .compatible = "mediatek,mt8183-dvfsrc", |
146 | .data = ®ulator_mt8183_data, |
147 | }, { |
148 | .compatible = "mediatek,mt8192-dvfsrc", |
149 | .data = ®ulator_mt6873_data, |
150 | }, { |
151 | .compatible = "mediatek,mt6873-dvfsrc", |
152 | .data = ®ulator_mt6873_data, |
153 | }, { |
154 | /* sentinel */ |
155 | }, |
156 | }; |
157 | MODULE_DEVICE_TABLE(of, mtk_dvfsrc_regulator_match); |
158 | |
159 | static int dvfsrc_vcore_regulator_probe(struct platform_device *pdev) |
160 | { |
161 | const struct of_device_id *match; |
162 | struct device *dev = &pdev->dev; |
163 | struct regulator_config config = { }; |
164 | struct regulator_dev *rdev; |
165 | const struct dvfsrc_regulator_init_data *regulator_init_data; |
166 | struct dvfsrc_regulator *mt_regulators; |
167 | int i; |
168 | |
169 | match = of_match_node(mtk_dvfsrc_regulator_match, dev->parent->of_node); |
170 | |
171 | if (!match) { |
172 | dev_err(dev, "invalid compatible string\n"); |
173 | return -ENODEV; |
174 | } |
175 | |
176 | regulator_init_data = match->data; |
177 | |
178 | mt_regulators = regulator_init_data->regulator_info; |
179 | for (i = 0; i < regulator_init_data->size; i++) { |
180 | config.dev = dev->parent; |
181 | config.driver_data = (mt_regulators + i); |
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182 | rdev = devm_regulator_register(dev, &(mt_regulators + i)->desc, |
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183 | &config); |
184 | if (IS_ERR(rdev)) { |
185 | dev_err(dev, "failed to register %s\n", |
186 | (mt_regulators + i)->desc.name); |
187 | return PTR_ERR(rdev); |
188 | } |
189 | } |
190 | |
191 | return 0; |
192 | } |
193 | |
194 | static struct platform_driver mtk_dvfsrc_regulator_driver = { |
195 | .driver = { |
196 | .name = "mtk-dvfsrc-regulator", |
197 | }, |
198 | .probe = dvfsrc_vcore_regulator_probe, |
199 | }; |
200 | |
201 | static int __init mtk_dvfsrc_regulator_init(void) |
202 | { |
203 | return platform_driver_register(&mtk_dvfsrc_regulator_driver); |
204 | } |
205 | subsys_initcall(mtk_dvfsrc_regulator_init); |
206 | |
207 | static void __exit mtk_dvfsrc_regulator_exit(void) |
208 | { |
209 | platform_driver_unregister(&mtk_dvfsrc_regulator_driver); |
210 | } |
211 | module_exit(mtk_dvfsrc_regulator_exit); |
212 | |
213 | MODULE_AUTHOR("Arvin wang <arvin.wang@mediatek.com>"); |
214 | MODULE_LICENSE("GPL v2"); |