1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
4 *
5 * Copyright (C) 2012 Renesas Electronics Corporation
6 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
7 */
8
9 #include <linux/err.h>
10 #include <linux/init.h>
11 #include <linux/mfd/as3711.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/of_regulator.h>
18 #include <linux/slab.h>
19
20 /*
21 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
22 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
23 * FAST: sdX_fast=1
24 * NORMAL: low_noise=1
25 * IDLE: low_noise=0
26 */
27
as3711_set_mode_sd(struct regulator_dev * rdev,unsigned int mode)28 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
29 {
30 unsigned int fast_bit = rdev->desc->enable_mask,
31 low_noise_bit = fast_bit << 4;
32 u8 val;
33
34 switch (mode) {
35 case REGULATOR_MODE_FAST:
36 val = fast_bit | low_noise_bit;
37 break;
38 case REGULATOR_MODE_NORMAL:
39 val = low_noise_bit;
40 break;
41 case REGULATOR_MODE_IDLE:
42 val = 0;
43 break;
44 default:
45 return -EINVAL;
46 }
47
48 return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
49 low_noise_bit | fast_bit, val);
50 }
51
as3711_get_mode_sd(struct regulator_dev * rdev)52 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
53 {
54 unsigned int fast_bit = rdev->desc->enable_mask,
55 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
56 unsigned int val;
57 int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
58
59 if (ret < 0)
60 return ret;
61
62 if ((val & mask) == mask)
63 return REGULATOR_MODE_FAST;
64
65 if ((val & mask) == low_noise_bit)
66 return REGULATOR_MODE_NORMAL;
67
68 if (!(val & mask))
69 return REGULATOR_MODE_IDLE;
70
71 return -EINVAL;
72 }
73
74 static const struct regulator_ops as3711_sd_ops = {
75 .is_enabled = regulator_is_enabled_regmap,
76 .enable = regulator_enable_regmap,
77 .disable = regulator_disable_regmap,
78 .get_voltage_sel = regulator_get_voltage_sel_regmap,
79 .set_voltage_sel = regulator_set_voltage_sel_regmap,
80 .list_voltage = regulator_list_voltage_linear_range,
81 .map_voltage = regulator_map_voltage_linear_range,
82 .get_mode = as3711_get_mode_sd,
83 .set_mode = as3711_set_mode_sd,
84 };
85
86 static const struct regulator_ops as3711_aldo_ops = {
87 .is_enabled = regulator_is_enabled_regmap,
88 .enable = regulator_enable_regmap,
89 .disable = regulator_disable_regmap,
90 .get_voltage_sel = regulator_get_voltage_sel_regmap,
91 .set_voltage_sel = regulator_set_voltage_sel_regmap,
92 .list_voltage = regulator_list_voltage_linear_range,
93 .map_voltage = regulator_map_voltage_linear_range,
94 };
95
96 static const struct regulator_ops as3711_dldo_ops = {
97 .is_enabled = regulator_is_enabled_regmap,
98 .enable = regulator_enable_regmap,
99 .disable = regulator_disable_regmap,
100 .get_voltage_sel = regulator_get_voltage_sel_regmap,
101 .set_voltage_sel = regulator_set_voltage_sel_regmap,
102 .list_voltage = regulator_list_voltage_linear_range,
103 .map_voltage = regulator_map_voltage_linear_range,
104 };
105
106 static const struct regulator_linear_range as3711_sd_ranges[] = {
107 REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
108 REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
109 REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
110 };
111
112 static const struct regulator_linear_range as3711_aldo_ranges[] = {
113 REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
114 REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
115 };
116
117 static const struct regulator_linear_range as3711_dldo_ranges[] = {
118 REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
119 REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
120 };
121
122 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx) \
123 [AS3711_REGULATOR_ ## _id] = { \
124 .name = "as3711-regulator-" # _id, \
125 .id = AS3711_REGULATOR_ ## _id, \
126 .n_voltages = (_vmask + 1), \
127 .ops = &as3711_ ## _sfx ## _ops, \
128 .type = REGULATOR_VOLTAGE, \
129 .owner = THIS_MODULE, \
130 .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
131 .vsel_mask = _vmask, \
132 .enable_reg = AS3711_ ## _en_reg, \
133 .enable_mask = BIT(_en_bit), \
134 .linear_ranges = as3711_ ## _sfx ## _ranges, \
135 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
136 }
137
138 static const struct regulator_desc as3711_reg_desc[] = {
139 AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
140 AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
141 AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
142 AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
143 AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
144 AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
145 AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
146 AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
147 AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
148 AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
149 AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
150 AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
151 /* StepUp output voltage depends on supplying regulator */
152 };
153
154 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_desc)
155
156 static struct of_regulator_match
157 as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
158 [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
159 [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
160 [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
161 [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
162 [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
163 [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
164 [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
165 [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
166 [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
167 [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
168 [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
169 [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
170 };
171
as3711_regulator_parse_dt(struct device * dev,struct device_node ** of_node,const int count)172 static int as3711_regulator_parse_dt(struct device *dev,
173 struct device_node **of_node, const int count)
174 {
175 struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
176 struct device_node *regulators =
177 of_get_child_by_name(dev->parent->of_node, "regulators");
178 struct of_regulator_match *match;
179 int ret, i;
180
181 if (!regulators) {
182 dev_err(dev, "regulator node not found\n");
183 return -ENODEV;
184 }
185
186 ret = of_regulator_match(dev->parent, regulators,
187 as3711_regulator_matches, count);
188 of_node_put(regulators);
189 if (ret < 0) {
190 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
191 return ret;
192 }
193
194 for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
195 if (match->of_node) {
196 pdata->init_data[i] = match->init_data;
197 of_node[i] = match->of_node;
198 }
199
200 return 0;
201 }
202
as3711_regulator_probe(struct platform_device * pdev)203 static int as3711_regulator_probe(struct platform_device *pdev)
204 {
205 struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
206 struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
207 struct regulator_config config = {.dev = &pdev->dev,};
208 struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
209 struct regulator_dev *rdev;
210 int ret;
211 int id;
212
213 if (!pdata) {
214 dev_err(&pdev->dev, "No platform data...\n");
215 return -ENODEV;
216 }
217
218 if (pdev->dev.parent->of_node) {
219 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
220 if (ret < 0) {
221 dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
222 return ret;
223 }
224 }
225
226 for (id = 0; id < AS3711_REGULATOR_NUM; id++) {
227 config.init_data = pdata->init_data[id];
228 config.regmap = as3711->regmap;
229 config.of_node = of_node[id];
230
231 rdev = devm_regulator_register(&pdev->dev, &as3711_reg_desc[id],
232 &config);
233 if (IS_ERR(rdev)) {
234 dev_err(&pdev->dev, "Failed to register regulator %s\n",
235 as3711_reg_desc[id].name);
236 return PTR_ERR(rdev);
237 }
238 }
239
240 return 0;
241 }
242
243 static struct platform_driver as3711_regulator_driver = {
244 .driver = {
245 .name = "as3711-regulator",
246 },
247 .probe = as3711_regulator_probe,
248 };
249
as3711_regulator_init(void)250 static int __init as3711_regulator_init(void)
251 {
252 return platform_driver_register(&as3711_regulator_driver);
253 }
254 subsys_initcall(as3711_regulator_init);
255
as3711_regulator_exit(void)256 static void __exit as3711_regulator_exit(void)
257 {
258 platform_driver_unregister(&as3711_regulator_driver);
259 }
260 module_exit(as3711_regulator_exit);
261
262 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
263 MODULE_DESCRIPTION("AS3711 regulator driver");
264 MODULE_ALIAS("platform:as3711-regulator");
265 MODULE_LICENSE("GPL v2");
266
