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 regulator_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 regulator_linear_range lochnagar_vddcore_ranges[] = {
101 REGULATOR_LINEAR_RANGE(600000, 0x8, 0x41, 12500),
102};
103
104enum lochnagar_regulators {
105 LOCHNAGAR_MICVDD,
106 LOCHNAGAR_MIC1VDD,
107 LOCHNAGAR_MIC2VDD,
108 LOCHNAGAR_VDDCORE,
109};
110
111static int lochnagar_micbias_of_parse(struct device_node *np,
112 const struct regulator_desc *desc,
113 struct regulator_config *config)
114{
115 struct lochnagar *lochnagar = config->driver_data;
116 int shift = (desc->id - LOCHNAGAR_MIC1VDD) *
117 LOCHNAGAR2_P2_MICBIAS_SRC_SHIFT;
118 int mask = LOCHNAGAR2_P1_MICBIAS_SRC_MASK << shift;
119 unsigned int val;
120 int ret;
121
122 ret = of_property_read_u32(np, "cirrus,micbias-input", &val);
123 if (ret >= 0) {
124 mutex_lock(&lochnagar->analogue_config_lock);
125 ret = regmap_update_bits(lochnagar->regmap,
126 LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
127 mask, val << shift);
128 mutex_unlock(&lochnagar->analogue_config_lock);
129 if (ret < 0) {
130 dev_err(lochnagar->dev,
131 "Failed to update micbias source: %d\n", ret);
132 return ret;
133 }
134 }
135
136 return 0;
137}
138
139static const struct regulator_desc lochnagar_regulators[] = {
140 [LOCHNAGAR_MICVDD] = {
141 .name = "MICVDD",
142 .supply_name = "SYSVDD",
143 .type = REGULATOR_VOLTAGE,
144 .n_voltages = 32,
145 .ops = &lochnagar_micvdd_ops,
146
147 .id = LOCHNAGAR_MICVDD,
148 .of_match = of_match_ptr("MICVDD"),
149
150 .enable_reg = LOCHNAGAR2_MICVDD_CTRL1,
151 .enable_mask = LOCHNAGAR2_MICVDD_REG_ENA_MASK,
152 .vsel_reg = LOCHNAGAR2_MICVDD_CTRL2,
153 .vsel_mask = LOCHNAGAR2_MICVDD_VSEL_MASK,
154
155 .linear_ranges = lochnagar_micvdd_ranges,
156 .n_linear_ranges = ARRAY_SIZE(lochnagar_micvdd_ranges),
157
158 .enable_time = 3000,
159 .ramp_delay = 1000,
160
161 .owner = THIS_MODULE,
162 },
163 [LOCHNAGAR_MIC1VDD] = {
164 .name = "MIC1VDD",
165 .supply_name = "MICBIAS1",
166 .type = REGULATOR_VOLTAGE,
167 .ops = &lochnagar_micbias_ops,
168
169 .id = LOCHNAGAR_MIC1VDD,
170 .of_match = of_match_ptr("MIC1VDD"),
171 .of_parse_cb = lochnagar_micbias_of_parse,
172
173 .enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
174 .enable_mask = LOCHNAGAR2_P1_INPUT_BIAS_ENA_MASK,
175
176 .owner = THIS_MODULE,
177 },
178 [LOCHNAGAR_MIC2VDD] = {
179 .name = "MIC2VDD",
180 .supply_name = "MICBIAS2",
181 .type = REGULATOR_VOLTAGE,
182 .ops = &lochnagar_micbias_ops,
183
184 .id = LOCHNAGAR_MIC2VDD,
185 .of_match = of_match_ptr("MIC2VDD"),
186 .of_parse_cb = lochnagar_micbias_of_parse,
187
188 .enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
189 .enable_mask = LOCHNAGAR2_P2_INPUT_BIAS_ENA_MASK,
190
191 .owner = THIS_MODULE,
192 },
193 [LOCHNAGAR_VDDCORE] = {
194 .name = "VDDCORE",
195 .supply_name = "SYSVDD",
196 .type = REGULATOR_VOLTAGE,
197 .n_voltages = 66,
198 .ops = &lochnagar_vddcore_ops,
199
200 .id = LOCHNAGAR_VDDCORE,
201 .of_match = of_match_ptr("VDDCORE"),
202
203 .enable_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL1,
204 .enable_mask = LOCHNAGAR2_VDDCORE_CDC_REG_ENA_MASK,
205 .vsel_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL2,
206 .vsel_mask = LOCHNAGAR2_VDDCORE_CDC_VSEL_MASK,
207
208 .linear_ranges = lochnagar_vddcore_ranges,
209 .n_linear_ranges = ARRAY_SIZE(lochnagar_vddcore_ranges),
210
211 .enable_time = 3000,
212 .ramp_delay = 1000,
213
214 .owner = THIS_MODULE,
215 },
216};
217
218static const struct of_device_id lochnagar_of_match[] = {
219 {
220 .compatible = "cirrus,lochnagar2-micvdd",
221 .data = &lochnagar_regulators[LOCHNAGAR_MICVDD],
222 },
223 {
224 .compatible = "cirrus,lochnagar2-mic1vdd",
225 .data = &lochnagar_regulators[LOCHNAGAR_MIC1VDD],
226 },
227 {
228 .compatible = "cirrus,lochnagar2-mic2vdd",
229 .data = &lochnagar_regulators[LOCHNAGAR_MIC2VDD],
230 },
231 {
232 .compatible = "cirrus,lochnagar2-vddcore",
233 .data = &lochnagar_regulators[LOCHNAGAR_VDDCORE],
234 },
235 {}
236};
237MODULE_DEVICE_TABLE(of, lochnagar_of_match);
238
239static int lochnagar_regulator_probe(struct platform_device *pdev)
240{
241 struct device *dev = &pdev->dev;
242 struct lochnagar *lochnagar = dev_get_drvdata(dev->parent);
243 struct regulator_config config = { };
244 const struct of_device_id *of_id;
245 const struct regulator_desc *desc;
246 struct regulator_dev *rdev;
247 int ret;
248
249 config.dev = dev;
250 config.regmap = lochnagar->regmap;
251 config.driver_data = lochnagar;
252
253 of_id = of_match_device(lochnagar_of_match, dev);
254 if (!of_id)
255 return -EINVAL;
256
257 desc = of_id->data;
258
259 rdev = devm_regulator_register(dev, desc, &config);
260 if (IS_ERR(rdev)) {
261 ret = PTR_ERR(rdev);
262 dev_err(dev, "Failed to register %s regulator: %d\n",
263 desc->name, ret);
264 return ret;
265 }
266
267 return 0;
268}
269
270static struct platform_driver lochnagar_regulator_driver = {
271 .driver = {
272 .name = "lochnagar-regulator",
273 .of_match_table = of_match_ptr(lochnagar_of_match),
274 },
275
276 .probe = lochnagar_regulator_probe,
277};
278module_platform_driver(lochnagar_regulator_driver);
279
280MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
281MODULE_DESCRIPTION("Regulator driver for Cirrus Logic Lochnagar Board");
282MODULE_LICENSE("GPL v2");
283MODULE_ALIAS("platform:lochnagar-regulator");
284