1 /*
2 * arizona-ldo1.c -- LDO1 supply for Arizona devices
3 *
4 * Copyright 2012 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/bitops.h>
18 #include <linux/err.h>
19 #include <linux/of.h>
20 #include <linux/gpio/consumer.h>
21 #include <linux/platform_device.h>
22 #include <linux/regulator/driver.h>
23 #include <linux/regulator/machine.h>
24 #include <linux/regulator/of_regulator.h>
25 #include <linux/slab.h>
26
27 #include <linux/regulator/arizona-ldo1.h>
28
29 #include <linux/mfd/arizona/core.h>
30 #include <linux/mfd/arizona/pdata.h>
31 #include <linux/mfd/arizona/registers.h>
32
33 struct arizona_ldo1 {
34 struct regulator_dev *regulator;
35 struct regmap *regmap;
36
37 struct regulator_consumer_supply supply;
38 struct regulator_init_data init_data;
39
40 struct gpio_desc *ena_gpiod;
41 };
42
arizona_ldo1_hc_list_voltage(struct regulator_dev * rdev,unsigned int selector)43 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
44 unsigned int selector)
45 {
46 if (selector >= rdev->desc->n_voltages)
47 return -EINVAL;
48
49 if (selector == rdev->desc->n_voltages - 1)
50 return 1800000;
51 else
52 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
53 }
54
arizona_ldo1_hc_map_voltage(struct regulator_dev * rdev,int min_uV,int max_uV)55 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
56 int min_uV, int max_uV)
57 {
58 int sel;
59
60 sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
61 if (sel >= rdev->desc->n_voltages)
62 sel = rdev->desc->n_voltages - 1;
63
64 return sel;
65 }
66
arizona_ldo1_hc_set_voltage_sel(struct regulator_dev * rdev,unsigned sel)67 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
68 unsigned sel)
69 {
70 struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
71 struct regmap *regmap = ldo->regmap;
72 unsigned int val;
73 int ret;
74
75 if (sel == rdev->desc->n_voltages - 1)
76 val = ARIZONA_LDO1_HI_PWR;
77 else
78 val = 0;
79
80 ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
81 ARIZONA_LDO1_HI_PWR, val);
82 if (ret != 0)
83 return ret;
84
85 if (val)
86 return 0;
87
88 val = sel << ARIZONA_LDO1_VSEL_SHIFT;
89
90 return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
91 ARIZONA_LDO1_VSEL_MASK, val);
92 }
93
arizona_ldo1_hc_get_voltage_sel(struct regulator_dev * rdev)94 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
95 {
96 struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
97 struct regmap *regmap = ldo->regmap;
98 unsigned int val;
99 int ret;
100
101 ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
102 if (ret != 0)
103 return ret;
104
105 if (val & ARIZONA_LDO1_HI_PWR)
106 return rdev->desc->n_voltages - 1;
107
108 ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
109 if (ret != 0)
110 return ret;
111
112 return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
113 }
114
115 static const struct regulator_ops arizona_ldo1_hc_ops = {
116 .list_voltage = arizona_ldo1_hc_list_voltage,
117 .map_voltage = arizona_ldo1_hc_map_voltage,
118 .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
119 .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
120 .get_bypass = regulator_get_bypass_regmap,
121 .set_bypass = regulator_set_bypass_regmap,
122 };
123
124 static const struct regulator_desc arizona_ldo1_hc = {
125 .name = "LDO1",
126 .supply_name = "LDOVDD",
127 .type = REGULATOR_VOLTAGE,
128 .ops = &arizona_ldo1_hc_ops,
129
130 .bypass_reg = ARIZONA_LDO1_CONTROL_1,
131 .bypass_mask = ARIZONA_LDO1_BYPASS,
132 .min_uV = 900000,
133 .uV_step = 50000,
134 .n_voltages = 8,
135 .enable_time = 1500,
136 .ramp_delay = 24000,
137
138 .owner = THIS_MODULE,
139 };
140
141 static const struct regulator_ops arizona_ldo1_ops = {
142 .list_voltage = regulator_list_voltage_linear,
143 .map_voltage = regulator_map_voltage_linear,
144 .get_voltage_sel = regulator_get_voltage_sel_regmap,
145 .set_voltage_sel = regulator_set_voltage_sel_regmap,
146 };
147
148 static const struct regulator_desc arizona_ldo1 = {
149 .name = "LDO1",
150 .supply_name = "LDOVDD",
151 .type = REGULATOR_VOLTAGE,
152 .ops = &arizona_ldo1_ops,
153
154 .vsel_reg = ARIZONA_LDO1_CONTROL_1,
155 .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
156 .min_uV = 900000,
157 .uV_step = 25000,
158 .n_voltages = 13,
159 .enable_time = 500,
160 .ramp_delay = 24000,
161
162 .owner = THIS_MODULE,
163 };
164
165 static const struct regulator_init_data arizona_ldo1_dvfs = {
166 .constraints = {
167 .min_uV = 1200000,
168 .max_uV = 1800000,
169 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
170 REGULATOR_CHANGE_VOLTAGE,
171 },
172 .num_consumer_supplies = 1,
173 };
174
175 static const struct regulator_init_data arizona_ldo1_default = {
176 .constraints = {
177 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
178 },
179 .num_consumer_supplies = 1,
180 };
181
182 static const struct regulator_init_data arizona_ldo1_wm5110 = {
183 .constraints = {
184 .min_uV = 1175000,
185 .max_uV = 1200000,
186 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
187 REGULATOR_CHANGE_VOLTAGE,
188 },
189 .num_consumer_supplies = 1,
190 };
191
arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata * pdata,struct regulator_config * config,const struct regulator_desc * desc,bool * external_dcvdd)192 static int arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata *pdata,
193 struct regulator_config *config,
194 const struct regulator_desc *desc,
195 bool *external_dcvdd)
196 {
197 struct arizona_ldo1 *ldo1 = config->driver_data;
198 struct device_node *np = config->dev->of_node;
199 struct device_node *init_node, *dcvdd_node;
200 struct regulator_init_data *init_data;
201
202 init_node = of_get_child_by_name(np, "ldo1");
203 dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
204
205 if (init_node) {
206 config->of_node = init_node;
207
208 init_data = of_get_regulator_init_data(config->dev, init_node,
209 desc);
210 if (init_data) {
211 init_data->consumer_supplies = &ldo1->supply;
212 init_data->num_consumer_supplies = 1;
213
214 if (dcvdd_node && dcvdd_node != init_node)
215 *external_dcvdd = true;
216
217 pdata->init_data = init_data;
218 }
219 } else if (dcvdd_node) {
220 *external_dcvdd = true;
221 }
222
223 of_node_put(dcvdd_node);
224
225 return 0;
226 }
227
arizona_ldo1_common_init(struct platform_device * pdev,struct arizona_ldo1 * ldo1,const struct regulator_desc * desc,struct arizona_ldo1_pdata * pdata,bool * external_dcvdd)228 static int arizona_ldo1_common_init(struct platform_device *pdev,
229 struct arizona_ldo1 *ldo1,
230 const struct regulator_desc *desc,
231 struct arizona_ldo1_pdata *pdata,
232 bool *external_dcvdd)
233 {
234 struct device *parent_dev = pdev->dev.parent;
235 struct regulator_config config = { };
236 int ret;
237
238 *external_dcvdd = false;
239
240 ldo1->supply.supply = "DCVDD";
241 ldo1->init_data.consumer_supplies = &ldo1->supply;
242 ldo1->supply.dev_name = dev_name(parent_dev);
243
244 config.dev = parent_dev;
245 config.driver_data = ldo1;
246 config.regmap = ldo1->regmap;
247
248 if (IS_ENABLED(CONFIG_OF)) {
249 if (!dev_get_platdata(parent_dev)) {
250 ret = arizona_ldo1_of_get_pdata(pdata,
251 &config, desc,
252 external_dcvdd);
253 if (ret < 0)
254 return ret;
255 }
256 }
257
258 /* We assume that high output = regulator off
259 * Don't use devm, since we need to get against the parent device
260 * so clean up would happen at the wrong time
261 */
262 config.ena_gpiod = gpiod_get_optional(parent_dev, "wlf,ldoena",
263 GPIOD_OUT_LOW);
264 if (IS_ERR(config.ena_gpiod))
265 return PTR_ERR(config.ena_gpiod);
266
267 ldo1->ena_gpiod = config.ena_gpiod;
268
269 if (pdata->init_data)
270 config.init_data = pdata->init_data;
271 else
272 config.init_data = &ldo1->init_data;
273
274 /*
275 * LDO1 can only be used to supply DCVDD so if it has no
276 * consumers then DCVDD is supplied externally.
277 */
278 if (config.init_data->num_consumer_supplies == 0)
279 *external_dcvdd = true;
280
281 ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
282
283 of_node_put(config.of_node);
284
285 if (IS_ERR(ldo1->regulator)) {
286 if (config.ena_gpiod)
287 gpiod_put(config.ena_gpiod);
288
289 ret = PTR_ERR(ldo1->regulator);
290 dev_err(&pdev->dev, "Failed to register LDO1 supply: %d\n",
291 ret);
292 return ret;
293 }
294
295 platform_set_drvdata(pdev, ldo1);
296
297 return 0;
298 }
299
arizona_ldo1_probe(struct platform_device * pdev)300 static int arizona_ldo1_probe(struct platform_device *pdev)
301 {
302 struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
303 struct arizona_ldo1 *ldo1;
304 const struct regulator_desc *desc;
305 bool external_dcvdd;
306 int ret;
307
308 ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
309 if (!ldo1)
310 return -ENOMEM;
311
312 ldo1->regmap = arizona->regmap;
313
314 /*
315 * Since the chip usually supplies itself we provide some
316 * default init_data for it. This will be overridden with
317 * platform data if provided.
318 */
319 switch (arizona->type) {
320 case WM5102:
321 case WM8997:
322 case WM8998:
323 case WM1814:
324 desc = &arizona_ldo1_hc;
325 ldo1->init_data = arizona_ldo1_dvfs;
326 break;
327 case WM5110:
328 case WM8280:
329 desc = &arizona_ldo1;
330 ldo1->init_data = arizona_ldo1_wm5110;
331 break;
332 default:
333 desc = &arizona_ldo1;
334 ldo1->init_data = arizona_ldo1_default;
335 break;
336 }
337
338 ret = arizona_ldo1_common_init(pdev, ldo1, desc,
339 &arizona->pdata.ldo1,
340 &external_dcvdd);
341 if (ret == 0)
342 arizona->external_dcvdd = external_dcvdd;
343
344 return ret;
345 }
346
arizona_ldo1_remove(struct platform_device * pdev)347 static int arizona_ldo1_remove(struct platform_device *pdev)
348 {
349 struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
350
351 if (ldo1->ena_gpiod)
352 gpiod_put(ldo1->ena_gpiod);
353
354 return 0;
355 }
356
357 static struct platform_driver arizona_ldo1_driver = {
358 .probe = arizona_ldo1_probe,
359 .remove = arizona_ldo1_remove,
360 .driver = {
361 .name = "arizona-ldo1",
362 },
363 };
364
365 module_platform_driver(arizona_ldo1_driver);
366
367 /* Module information */
368 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
369 MODULE_DESCRIPTION("Arizona LDO1 driver");
370 MODULE_LICENSE("GPL");
371 MODULE_ALIAS("platform:arizona-ldo1");
372