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_.h> |
10 | #include <linux/regulator/driver.h> |
11 | #include <linux/regulator/of_regulator.h> |
12 | #include <linux/soc/mediatek/mtk_dvfsrc.h> |
13 | |
14 | #define DVFSRC_ID_VCORE 0 |
15 | #define DVFSRC_ID_VSCP 1 |
16 | |
17 | #define MT_DVFSRC_REGULAR(match, _name, _volt_table) \ |
18 | [DVFSRC_ID_##_name] = { \ |
19 | .desc = { \ |
20 | .name = match, \ |
21 | .of_match = of_match_ptr(match), \ |
22 | .ops = &dvfsrc_vcore_ops, \ |
23 | .type = REGULATOR_VOLTAGE, \ |
24 | .id = DVFSRC_ID_##_name, \ |
25 | .owner = THIS_MODULE, \ |
26 | .n_voltages = ARRAY_SIZE(_volt_table), \ |
27 | .volt_table = _volt_table, \ |
28 | }, \ |
29 | } |
30 | |
31 | /* |
32 | * DVFSRC regulators' information |
33 | * |
34 | * @desc: standard fields of regulator description. |
35 | * @voltage_selector: Selector used for get_voltage_sel() and |
36 | * set_voltage_sel() callbacks |
37 | */ |
38 | |
39 | struct dvfsrc_regulator { |
40 | struct regulator_desc desc; |
41 | }; |
42 | |
43 | /* |
44 | * MTK DVFSRC regulators' init data |
45 | * |
46 | * @size: num of regulators |
47 | * @regulator_info: regulator info. |
48 | */ |
49 | struct dvfsrc_regulator_init_data { |
50 | u32 size; |
51 | struct dvfsrc_regulator *regulator_info; |
52 | }; |
53 | |
54 | static inline struct device *to_dvfsrc_dev(struct regulator_dev *rdev) |
55 | { |
56 | return rdev_get_dev(rdev)->parent; |
57 | } |
58 | |
59 | static int dvfsrc_set_voltage_sel(struct regulator_dev *rdev, |
60 | unsigned int selector) |
61 | { |
62 | struct device *dvfsrc_dev = to_dvfsrc_dev(rdev); |
63 | int id = rdev_get_id(rdev); |
64 | |
65 | if (id == DVFSRC_ID_VCORE) |
66 | mtk_dvfsrc_send_request(dvfsrc_dev, |
67 | MTK_DVFSRC_CMD_VCORE_REQUEST, |
68 | selector); |
69 | else if (id == DVFSRC_ID_VSCP) |
70 | mtk_dvfsrc_send_request(dvfsrc_dev, |
71 | MTK_DVFSRC_CMD_VSCP_REQUEST, |
72 | selector); |
73 | else |
74 | return -EINVAL; |
75 | |
76 | return 0; |
77 | } |
78 | |
79 | static int dvfsrc_get_voltage_sel(struct regulator_dev *rdev) |
80 | { |
81 | struct device *dvfsrc_dev = to_dvfsrc_dev(rdev); |
82 | int id = rdev_get_id(rdev); |
83 | int val, ret; |
84 | |
85 | if (id == DVFSRC_ID_VCORE) |
86 | ret = mtk_dvfsrc_query_info(dvfsrc_dev, |
87 | MTK_DVFSRC_CMD_VCORE_LEVEL_QUERY, |
88 | &val); |
89 | else if (id == DVFSRC_ID_VSCP) |
90 | ret = mtk_dvfsrc_query_info(dvfsrc_dev, |
91 | MTK_DVFSRC_CMD_VSCP_LEVEL_QUERY, |
92 | &val); |
93 | else |
94 | return -EINVAL; |
95 | |
96 | if (ret != 0) |
97 | return ret; |
98 | |
99 | return val; |
100 | } |
101 | |
102 | static const struct regulator_ops dvfsrc_vcore_ops = { |
103 | .list_voltage = regulator_list_voltage_table, |
104 | .get_voltage_sel = dvfsrc_get_voltage_sel, |
105 | .set_voltage_sel = dvfsrc_set_voltage_sel, |
106 | }; |
107 | |
108 | static const unsigned int mt8183_voltages[] = { |
109 | 725000, |
110 | 800000, |
111 | }; |
112 | |
113 | static struct dvfsrc_regulator mt8183_regulators[] = { |
114 | MT_DVFSRC_REGULAR("dvfsrc-vcore" , VCORE, |
115 | mt8183_voltages), |
116 | }; |
117 | |
118 | static const struct dvfsrc_regulator_init_data regulator_mt8183_data = { |
119 | .size = ARRAY_SIZE(mt8183_regulators), |
120 | .regulator_info = &mt8183_regulators[0], |
121 | }; |
122 | |
123 | static const unsigned int mt6873_voltages[] = { |
124 | 575000, |
125 | 600000, |
126 | 650000, |
127 | 725000, |
128 | }; |
129 | |
130 | static struct dvfsrc_regulator mt6873_regulators[] = { |
131 | MT_DVFSRC_REGULAR("dvfsrc-vcore" , VCORE, |
132 | mt6873_voltages), |
133 | MT_DVFSRC_REGULAR("dvfsrc-vscp" , VSCP, |
134 | mt6873_voltages), |
135 | }; |
136 | |
137 | static const struct dvfsrc_regulator_init_data regulator_mt6873_data = { |
138 | .size = ARRAY_SIZE(mt6873_regulators), |
139 | .regulator_info = &mt6873_regulators[0], |
140 | }; |
141 | |
142 | static const struct of_device_id mtk_dvfsrc_regulator_match[] = { |
143 | { |
144 | .compatible = "mediatek,mt8183-dvfsrc" , |
145 | .data = ®ulator_mt8183_data, |
146 | }, { |
147 | .compatible = "mediatek,mt8192-dvfsrc" , |
148 | .data = ®ulator_mt6873_data, |
149 | }, { |
150 | .compatible = "mediatek,mt6873-dvfsrc" , |
151 | .data = ®ulator_mt6873_data, |
152 | }, { |
153 | /* sentinel */ |
154 | }, |
155 | }; |
156 | MODULE_DEVICE_TABLE(of, mtk_dvfsrc_regulator_match); |
157 | |
158 | static int dvfsrc_vcore_regulator_probe(struct platform_device *pdev) |
159 | { |
160 | const struct of_device_id *match; |
161 | struct device *dev = &pdev->dev; |
162 | struct regulator_config config = { }; |
163 | struct regulator_dev *rdev; |
164 | const struct dvfsrc_regulator_init_data *regulator_init_data; |
165 | struct dvfsrc_regulator *mt_regulators; |
166 | int i; |
167 | |
168 | match = of_match_node(mtk_dvfsrc_regulator_match, dev->parent->of_node); |
169 | |
170 | if (!match) { |
171 | dev_err(dev, "invalid compatible string\n" ); |
172 | return -ENODEV; |
173 | } |
174 | |
175 | regulator_init_data = match->data; |
176 | |
177 | mt_regulators = regulator_init_data->regulator_info; |
178 | for (i = 0; i < regulator_init_data->size; i++) { |
179 | config.dev = dev->parent; |
180 | config.driver_data = (mt_regulators + i); |
181 | rdev = devm_regulator_register(dev, regulator_desc: &(mt_regulators + i)->desc, |
182 | config: &config); |
183 | if (IS_ERR(ptr: rdev)) { |
184 | dev_err(dev, "failed to register %s\n" , |
185 | (mt_regulators + i)->desc.name); |
186 | return PTR_ERR(ptr: rdev); |
187 | } |
188 | } |
189 | |
190 | return 0; |
191 | } |
192 | |
193 | static struct platform_driver mtk_dvfsrc_regulator_driver = { |
194 | .driver = { |
195 | .name = "mtk-dvfsrc-regulator" , |
196 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
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" ); |
215 | |