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 
27 static 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 
39 static 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 
44 static 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 
57 err:
58 	mutex_unlock(&lochnagar->analogue_config_lock);
59 
60 	return ret;
61 }
62 
63 static 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 
76 err:
77 	mutex_unlock(&lochnagar->analogue_config_lock);
78 
79 	return ret;
80 }
81 
82 static 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 
88 static 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 
100 static const struct regulator_linear_range lochnagar_vddcore_ranges[] = {
101 	REGULATOR_LINEAR_RANGE(600000, 0x8, 0x41, 12500),
102 };
103 
104 enum lochnagar_regulators {
105 	LOCHNAGAR_MICVDD,
106 	LOCHNAGAR_MIC1VDD,
107 	LOCHNAGAR_MIC2VDD,
108 	LOCHNAGAR_VDDCORE,
109 };
110 
111 static 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 
139 static 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 		.off_on_delay = 15000,
214 
215 		.owner = THIS_MODULE,
216 	},
217 };
218 
219 static const struct of_device_id lochnagar_of_match[] = {
220 	{
221 		.compatible = "cirrus,lochnagar2-micvdd",
222 		.data = &lochnagar_regulators[LOCHNAGAR_MICVDD],
223 	},
224 	{
225 		.compatible = "cirrus,lochnagar2-mic1vdd",
226 		.data = &lochnagar_regulators[LOCHNAGAR_MIC1VDD],
227 	},
228 	{
229 		.compatible = "cirrus,lochnagar2-mic2vdd",
230 		.data = &lochnagar_regulators[LOCHNAGAR_MIC2VDD],
231 	},
232 	{
233 		.compatible = "cirrus,lochnagar2-vddcore",
234 		.data = &lochnagar_regulators[LOCHNAGAR_VDDCORE],
235 	},
236 	{}
237 };
238 MODULE_DEVICE_TABLE(of, lochnagar_of_match);
239 
240 static int lochnagar_regulator_probe(struct platform_device *pdev)
241 {
242 	struct device *dev = &pdev->dev;
243 	struct lochnagar *lochnagar = dev_get_drvdata(dev->parent);
244 	struct regulator_config config = { };
245 	const struct of_device_id *of_id;
246 	const struct regulator_desc *desc;
247 	struct regulator_dev *rdev;
248 	int ret;
249 
250 	config.dev = dev;
251 	config.regmap = lochnagar->regmap;
252 	config.driver_data = lochnagar;
253 
254 	of_id = of_match_device(lochnagar_of_match, dev);
255 	if (!of_id)
256 		return -EINVAL;
257 
258 	desc = of_id->data;
259 
260 	rdev = devm_regulator_register(dev, desc, &config);
261 	if (IS_ERR(rdev)) {
262 		ret = PTR_ERR(rdev);
263 		dev_err(dev, "Failed to register %s regulator: %d\n",
264 			desc->name, ret);
265 		return ret;
266 	}
267 
268 	return 0;
269 }
270 
271 static struct platform_driver lochnagar_regulator_driver = {
272 	.driver = {
273 		.name = "lochnagar-regulator",
274 		.of_match_table = of_match_ptr(lochnagar_of_match),
275 	},
276 
277 	.probe = lochnagar_regulator_probe,
278 };
279 module_platform_driver(lochnagar_regulator_driver);
280 
281 MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
282 MODULE_DESCRIPTION("Regulator driver for Cirrus Logic Lochnagar Board");
283 MODULE_LICENSE("GPL v2");
284 MODULE_ALIAS("platform:lochnagar-regulator");
285