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1// SPDX-License-Identifier: GPL-2.0
2//
3// Lochnagar regulator driver
4//
5// Copyright (c) 2017-2018 Cirrus Logic, Inc. and
6// Cirrus Logic International Semiconductor Ltd.
7//
8// Author: Charles Keepax <ckeepax@opensource.cirrus.com>
9
10#include <linux/bitops.h>
11#include <linux/device.h>
12#include <linux/err.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
15#include <linux/of.h>
16#include <linux/of_device.h>
17#include <linux/platform_device.h>
18#include <linux/regmap.h>
19#include <linux/regulator/driver.h>
20#include <linux/regulator/machine.h>
21#include <linux/regulator/of_regulator.h>
22
23#include <linux/mfd/lochnagar.h>
24#include <linux/mfd/lochnagar1_regs.h>
25#include <linux/mfd/lochnagar2_regs.h>
26
27static const struct regulator_ops lochnagar_micvdd_ops = {
28 .enable = regulator_enable_regmap,
29 .disable = regulator_disable_regmap,
30 .is_enabled = regulator_is_enabled_regmap,
31
32 .list_voltage = regulator_list_voltage_linear_range,
33 .map_voltage = regulator_map_voltage_linear_range,
34
35 .get_voltage_sel = regulator_get_voltage_sel_regmap,
36 .set_voltage_sel = regulator_set_voltage_sel_regmap,
37};
38
39static const struct linear_range lochnagar_micvdd_ranges[] = {
40 REGULATOR_LINEAR_RANGE(1000000, 0, 0xC, 50000),
41 REGULATOR_LINEAR_RANGE(1700000, 0xD, 0x1F, 100000),
42};
43
44static int lochnagar_micbias_enable(struct regulator_dev *rdev)
45{
46 struct lochnagar *lochnagar = rdev_get_drvdata(rdev);
47 int ret;
48
49 mutex_lock(&lochnagar->analogue_config_lock);
50
51 ret = regulator_enable_regmap(rdev);
52 if (ret < 0)
53 goto err;
54
55 ret = lochnagar_update_config(lochnagar);
56
57err:
58 mutex_unlock(&lochnagar->analogue_config_lock);
59
60 return ret;
61}
62
63static int lochnagar_micbias_disable(struct regulator_dev *rdev)
64{
65 struct lochnagar *lochnagar = rdev_get_drvdata(rdev);
66 int ret;
67
68 mutex_lock(&lochnagar->analogue_config_lock);
69
70 ret = regulator_disable_regmap(rdev);
71 if (ret < 0)
72 goto err;
73
74 ret = lochnagar_update_config(lochnagar);
75
76err:
77 mutex_unlock(&lochnagar->analogue_config_lock);
78
79 return ret;
80}
81
82static const struct regulator_ops lochnagar_micbias_ops = {
83 .enable = lochnagar_micbias_enable,
84 .disable = lochnagar_micbias_disable,
85 .is_enabled = regulator_is_enabled_regmap,
86};
87
88static const struct regulator_ops lochnagar_vddcore_ops = {
89 .enable = regulator_enable_regmap,
90 .disable = regulator_disable_regmap,
91 .is_enabled = regulator_is_enabled_regmap,
92
93 .list_voltage = regulator_list_voltage_linear_range,
94 .map_voltage = regulator_map_voltage_linear_range,
95
96 .get_voltage_sel = regulator_get_voltage_sel_regmap,
97 .set_voltage_sel = regulator_set_voltage_sel_regmap,
98};
99
100static const struct linear_range lochnagar_vddcore_ranges[] = {
101 REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
102 REGULATOR_LINEAR_RANGE(600000, 0x8, 0x41, 12500),
103};
104
105enum lochnagar_regulators {
106 LOCHNAGAR_MICVDD,
107 LOCHNAGAR_MIC1VDD,
108 LOCHNAGAR_MIC2VDD,
109 LOCHNAGAR_VDDCORE,
110};
111
112static int lochnagar_micbias_of_parse(struct device_node *np,
113 const struct regulator_desc *desc,
114 struct regulator_config *config)
115{
116 struct lochnagar *lochnagar = config->driver_data;
117 int shift = (desc->id - LOCHNAGAR_MIC1VDD) *
118 LOCHNAGAR2_P2_MICBIAS_SRC_SHIFT;
119 int mask = LOCHNAGAR2_P1_MICBIAS_SRC_MASK << shift;
120 unsigned int val;
121 int ret;
122
123 ret = of_property_read_u32(np, "cirrus,micbias-input", &val);
124 if (ret >= 0) {
125 mutex_lock(&lochnagar->analogue_config_lock);
126 ret = regmap_update_bits(lochnagar->regmap,
127 LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
128 mask, val << shift);
129 mutex_unlock(&lochnagar->analogue_config_lock);
130 if (ret < 0) {
131 dev_err(lochnagar->dev,
132 "Failed to update micbias source: %d\n", ret);
133 return ret;
134 }
135 }
136
137 return 0;
138}
139
140static const struct regulator_desc lochnagar_regulators[] = {
141 [LOCHNAGAR_MICVDD] = {
142 .name = "MICVDD",
143 .supply_name = "SYSVDD",
144 .type = REGULATOR_VOLTAGE,
145 .n_voltages = 32,
146 .ops = &lochnagar_micvdd_ops,
147
148 .id = LOCHNAGAR_MICVDD,
149 .of_match = of_match_ptr("MICVDD"),
150
151 .enable_reg = LOCHNAGAR2_MICVDD_CTRL1,
152 .enable_mask = LOCHNAGAR2_MICVDD_REG_ENA_MASK,
153 .vsel_reg = LOCHNAGAR2_MICVDD_CTRL2,
154 .vsel_mask = LOCHNAGAR2_MICVDD_VSEL_MASK,
155
156 .linear_ranges = lochnagar_micvdd_ranges,
157 .n_linear_ranges = ARRAY_SIZE(lochnagar_micvdd_ranges),
158
159 .enable_time = 3000,
160 .ramp_delay = 1000,
161
162 .owner = THIS_MODULE,
163 },
164 [LOCHNAGAR_MIC1VDD] = {
165 .name = "MIC1VDD",
166 .supply_name = "MICBIAS1",
167 .type = REGULATOR_VOLTAGE,
168 .ops = &lochnagar_micbias_ops,
169
170 .id = LOCHNAGAR_MIC1VDD,
171 .of_match = of_match_ptr("MIC1VDD"),
172 .of_parse_cb = lochnagar_micbias_of_parse,
173
174 .enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
175 .enable_mask = LOCHNAGAR2_P1_INPUT_BIAS_ENA_MASK,
176
177 .owner = THIS_MODULE,
178 },
179 [LOCHNAGAR_MIC2VDD] = {
180 .name = "MIC2VDD",
181 .supply_name = "MICBIAS2",
182 .type = REGULATOR_VOLTAGE,
183 .ops = &lochnagar_micbias_ops,
184
185 .id = LOCHNAGAR_MIC2VDD,
186 .of_match = of_match_ptr("MIC2VDD"),
187 .of_parse_cb = lochnagar_micbias_of_parse,
188
189 .enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
190 .enable_mask = LOCHNAGAR2_P2_INPUT_BIAS_ENA_MASK,
191
192 .owner = THIS_MODULE,
193 },
194 [LOCHNAGAR_VDDCORE] = {
195 .name = "VDDCORE",
196 .supply_name = "SYSVDD",
197 .type = REGULATOR_VOLTAGE,
198 .n_voltages = 66,
199 .ops = &lochnagar_vddcore_ops,
200
201 .id = LOCHNAGAR_VDDCORE,
202 .of_match = of_match_ptr("VDDCORE"),
203
204 .enable_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL1,
205 .enable_mask = LOCHNAGAR2_VDDCORE_CDC_REG_ENA_MASK,
206 .vsel_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL2,
207 .vsel_mask = LOCHNAGAR2_VDDCORE_CDC_VSEL_MASK,
208
209 .linear_ranges = lochnagar_vddcore_ranges,
210 .n_linear_ranges = ARRAY_SIZE(lochnagar_vddcore_ranges),
211
212 .enable_time = 3000,
213 .ramp_delay = 1000,
214 .off_on_delay = 15000,
215
216 .owner = THIS_MODULE,
217 },
218};
219
220static const struct of_device_id lochnagar_of_match[] = {
221 {
222 .compatible = "cirrus,lochnagar2-micvdd",
223 .data = &lochnagar_regulators[LOCHNAGAR_MICVDD],
224 },
225 {
226 .compatible = "cirrus,lochnagar2-mic1vdd",
227 .data = &lochnagar_regulators[LOCHNAGAR_MIC1VDD],
228 },
229 {
230 .compatible = "cirrus,lochnagar2-mic2vdd",
231 .data = &lochnagar_regulators[LOCHNAGAR_MIC2VDD],
232 },
233 {
234 .compatible = "cirrus,lochnagar2-vddcore",
235 .data = &lochnagar_regulators[LOCHNAGAR_VDDCORE],
236 },
237 {}
238};
239MODULE_DEVICE_TABLE(of, lochnagar_of_match);
240
241static int lochnagar_regulator_probe(struct platform_device *pdev)
242{
243 struct device *dev = &pdev->dev;
244 struct lochnagar *lochnagar = dev_get_drvdata(dev->parent);
245 struct regulator_config config = { };
246 const struct of_device_id *of_id;
247 const struct regulator_desc *desc;
248 struct regulator_dev *rdev;
249 int ret;
250
251 config.dev = dev;
252 config.regmap = lochnagar->regmap;
253 config.driver_data = lochnagar;
254
255 of_id = of_match_device(lochnagar_of_match, dev);
256 if (!of_id)
257 return -EINVAL;
258
259 desc = of_id->data;
260
261 rdev = devm_regulator_register(dev, desc, &config);
262 if (IS_ERR(rdev)) {
263 ret = PTR_ERR(rdev);
264 dev_err(dev, "Failed to register %s regulator: %d\n",
265 desc->name, ret);
266 return ret;
267 }
268
269 return 0;
270}
271
272static struct platform_driver lochnagar_regulator_driver = {
273 .driver = {
274 .name = "lochnagar-regulator",
275 .of_match_table = of_match_ptr(lochnagar_of_match),
276 },
277
278 .probe = lochnagar_regulator_probe,
279};
280module_platform_driver(lochnagar_regulator_driver);
281
282MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
283MODULE_DESCRIPTION("Regulator driver for Cirrus Logic Lochnagar Board");
284MODULE_LICENSE("GPL v2");
285MODULE_ALIAS("platform:lochnagar-regulator");