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
to_dvfsrc_dev(struct regulator_dev * rdev)54 static inline struct device *to_dvfsrc_dev(struct regulator_dev *rdev)
55 {
56 return rdev_get_dev(rdev)->parent;
57 }
58
dvfsrc_set_voltage_sel(struct regulator_dev * rdev,unsigned int selector)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
dvfsrc_get_voltage_sel(struct regulator_dev * rdev)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
dvfsrc_vcore_regulator_probe(struct platform_device * pdev)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, &(mt_regulators + i)->desc,
182 &config);
183 if (IS_ERR(rdev)) {
184 dev_err(dev, "failed to register %s\n",
185 (mt_regulators + i)->desc.name);
186 return PTR_ERR(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
mtk_dvfsrc_regulator_init(void)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
mtk_dvfsrc_regulator_exit(void)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