1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // arizona-ldo1.c  --  LDO1 supply for Arizona devices
4 //
5 // Copyright 2012 Wolfson Microelectronics PLC.
6 //
7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/init.h>
12 #include <linux/bitops.h>
13 #include <linux/err.h>
14 #include <linux/of.h>
15 #include <linux/gpio/consumer.h>
16 #include <linux/platform_device.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/machine.h>
19 #include <linux/regulator/of_regulator.h>
20 #include <linux/slab.h>
21 
22 #include <linux/regulator/arizona-ldo1.h>
23 
24 #include <linux/mfd/arizona/core.h>
25 #include <linux/mfd/arizona/pdata.h>
26 #include <linux/mfd/arizona/registers.h>
27 
28 #include <linux/mfd/madera/core.h>
29 #include <linux/mfd/madera/pdata.h>
30 #include <linux/mfd/madera/registers.h>
31 
32 struct arizona_ldo1 {
33 	struct regulator_dev *regulator;
34 	struct regmap *regmap;
35 
36 	struct regulator_consumer_supply supply;
37 	struct regulator_init_data init_data;
38 
39 	struct gpio_desc *ena_gpiod;
40 };
41 
arizona_ldo1_hc_set_voltage_sel(struct regulator_dev * rdev,unsigned sel)42 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
43 					   unsigned sel)
44 {
45 	struct regmap *regmap = rdev_get_regmap(rdev);
46 	unsigned int val;
47 	int ret;
48 
49 	if (sel == rdev->desc->n_voltages - 1)
50 		val = ARIZONA_LDO1_HI_PWR;
51 	else
52 		val = 0;
53 
54 	ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
55 				 ARIZONA_LDO1_HI_PWR, val);
56 	if (ret != 0)
57 		return ret;
58 
59 	if (val)
60 		return 0;
61 
62 	return regulator_set_voltage_sel_regmap(rdev, sel);
63 }
64 
arizona_ldo1_hc_get_voltage_sel(struct regulator_dev * rdev)65 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
66 {
67 	struct regmap *regmap = rdev_get_regmap(rdev);
68 	unsigned int val;
69 	int ret;
70 
71 	ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
72 	if (ret != 0)
73 		return ret;
74 
75 	if (val & ARIZONA_LDO1_HI_PWR)
76 		return rdev->desc->n_voltages - 1;
77 
78 	return regulator_get_voltage_sel_regmap(rdev);
79 }
80 
81 static const struct regulator_ops arizona_ldo1_hc_ops = {
82 	.list_voltage = regulator_list_voltage_linear_range,
83 	.map_voltage = regulator_map_voltage_linear_range,
84 	.get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
85 	.set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
86 	.get_bypass = regulator_get_bypass_regmap,
87 	.set_bypass = regulator_set_bypass_regmap,
88 };
89 
90 static const struct linear_range arizona_ldo1_hc_ranges[] = {
91 	REGULATOR_LINEAR_RANGE(900000, 0, 0x6, 50000),
92 	REGULATOR_LINEAR_RANGE(1800000, 0x7, 0x7, 0),
93 };
94 
95 static const struct regulator_desc arizona_ldo1_hc = {
96 	.name = "LDO1",
97 	.supply_name = "LDOVDD",
98 	.type = REGULATOR_VOLTAGE,
99 	.ops = &arizona_ldo1_hc_ops,
100 
101 	.vsel_reg = ARIZONA_LDO1_CONTROL_1,
102 	.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
103 	.bypass_reg = ARIZONA_LDO1_CONTROL_1,
104 	.bypass_mask = ARIZONA_LDO1_BYPASS,
105 	.linear_ranges = arizona_ldo1_hc_ranges,
106 	.n_linear_ranges = ARRAY_SIZE(arizona_ldo1_hc_ranges),
107 	.n_voltages = 8,
108 	.enable_time = 1500,
109 	.ramp_delay = 24000,
110 
111 	.owner = THIS_MODULE,
112 };
113 
114 static const struct regulator_ops arizona_ldo1_ops = {
115 	.list_voltage = regulator_list_voltage_linear,
116 	.map_voltage = regulator_map_voltage_linear,
117 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
118 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
119 };
120 
121 static const struct regulator_desc arizona_ldo1 = {
122 	.name = "LDO1",
123 	.supply_name = "LDOVDD",
124 	.type = REGULATOR_VOLTAGE,
125 	.ops = &arizona_ldo1_ops,
126 
127 	.vsel_reg = ARIZONA_LDO1_CONTROL_1,
128 	.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
129 	.min_uV = 900000,
130 	.uV_step = 25000,
131 	.n_voltages = 13,
132 	.enable_time = 500,
133 	.ramp_delay = 24000,
134 
135 	.owner = THIS_MODULE,
136 };
137 
138 static const struct regulator_init_data arizona_ldo1_dvfs = {
139 	.constraints = {
140 		.min_uV = 1200000,
141 		.max_uV = 1800000,
142 		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
143 				  REGULATOR_CHANGE_VOLTAGE,
144 	},
145 	.num_consumer_supplies = 1,
146 };
147 
148 static const struct regulator_init_data arizona_ldo1_default = {
149 	.constraints = {
150 		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
151 	},
152 	.num_consumer_supplies = 1,
153 };
154 
155 static const struct regulator_init_data arizona_ldo1_wm5110 = {
156 	.constraints = {
157 		.min_uV = 1175000,
158 		.max_uV = 1200000,
159 		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
160 				  REGULATOR_CHANGE_VOLTAGE,
161 	},
162 	.num_consumer_supplies = 1,
163 };
164 
165 static const struct regulator_desc madera_ldo1 = {
166 	.name = "LDO1",
167 	.supply_name = "LDOVDD",
168 	.type = REGULATOR_VOLTAGE,
169 	.ops = &arizona_ldo1_ops,
170 
171 	.vsel_reg = MADERA_LDO1_CONTROL_1,
172 	.vsel_mask = MADERA_LDO1_VSEL_MASK,
173 	.min_uV = 900000,
174 	.uV_step = 25000,
175 	.n_voltages = 13,
176 	.enable_time = 3000,
177 
178 	.owner = THIS_MODULE,
179 };
180 
181 static const struct regulator_init_data madera_ldo1_default = {
182 	.constraints = {
183 		.min_uV = 1200000,
184 		.max_uV = 1200000,
185 		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
186 	},
187 	.num_consumer_supplies = 1,
188 };
189 
arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata * pdata,struct regulator_config * config,const struct regulator_desc * desc,bool * external_dcvdd)190 static int arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata *pdata,
191 				     struct regulator_config *config,
192 				     const struct regulator_desc *desc,
193 				     bool *external_dcvdd)
194 {
195 	struct arizona_ldo1 *ldo1 = config->driver_data;
196 	struct device_node *np = config->dev->of_node;
197 	struct device_node *init_node, *dcvdd_node;
198 	struct regulator_init_data *init_data;
199 
200 	init_node = of_get_child_by_name(np, "ldo1");
201 	dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
202 
203 	if (init_node) {
204 		config->of_node = init_node;
205 
206 		init_data = of_get_regulator_init_data(config->dev, init_node,
207 						       desc);
208 		if (init_data) {
209 			init_data->consumer_supplies = &ldo1->supply;
210 			init_data->num_consumer_supplies = 1;
211 
212 			if (dcvdd_node && dcvdd_node != init_node)
213 				*external_dcvdd = true;
214 
215 			pdata->init_data = init_data;
216 		}
217 	} else if (dcvdd_node) {
218 		*external_dcvdd = true;
219 	}
220 
221 	of_node_put(dcvdd_node);
222 
223 	return 0;
224 }
225 
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)226 static int arizona_ldo1_common_init(struct platform_device *pdev,
227 				    struct arizona_ldo1 *ldo1,
228 				    const struct regulator_desc *desc,
229 				    struct arizona_ldo1_pdata *pdata,
230 				    bool *external_dcvdd)
231 {
232 	struct device *parent_dev = pdev->dev.parent;
233 	struct regulator_config config = { };
234 	int ret;
235 
236 	*external_dcvdd = false;
237 
238 	ldo1->supply.supply = "DCVDD";
239 	ldo1->init_data.consumer_supplies = &ldo1->supply;
240 	ldo1->supply.dev_name = dev_name(parent_dev);
241 
242 	config.dev = parent_dev;
243 	config.driver_data = ldo1;
244 	config.regmap = ldo1->regmap;
245 
246 	if (IS_ENABLED(CONFIG_OF)) {
247 		if (!dev_get_platdata(parent_dev)) {
248 			ret = arizona_ldo1_of_get_pdata(pdata,
249 							&config, desc,
250 							external_dcvdd);
251 			if (ret < 0)
252 				return ret;
253 		}
254 	}
255 
256 	/* We assume that high output = regulator off
257 	 * Don't use devm, since we need to get against the parent device
258 	 * so clean up would happen at the wrong time
259 	 */
260 	config.ena_gpiod = gpiod_get_optional(parent_dev, "wlf,ldoena",
261 				GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
262 	if (IS_ERR(config.ena_gpiod))
263 		return PTR_ERR(config.ena_gpiod);
264 
265 	ldo1->ena_gpiod = config.ena_gpiod;
266 
267 	if (pdata->init_data)
268 		config.init_data = pdata->init_data;
269 	else
270 		config.init_data = &ldo1->init_data;
271 
272 	/*
273 	 * LDO1 can only be used to supply DCVDD so if it has no
274 	 * consumers then DCVDD is supplied externally.
275 	 */
276 	if (config.init_data->num_consumer_supplies == 0)
277 		*external_dcvdd = true;
278 
279 	ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
280 
281 	of_node_put(config.of_node);
282 
283 	if (IS_ERR(ldo1->regulator)) {
284 		ret = PTR_ERR(ldo1->regulator);
285 		dev_err(&pdev->dev, "Failed to register LDO1 supply: %d\n",
286 			ret);
287 		return ret;
288 	}
289 
290 	platform_set_drvdata(pdev, ldo1);
291 
292 	return 0;
293 }
294 
arizona_ldo1_probe(struct platform_device * pdev)295 static int arizona_ldo1_probe(struct platform_device *pdev)
296 {
297 	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
298 	struct arizona_ldo1 *ldo1;
299 	const struct regulator_desc *desc;
300 	bool external_dcvdd;
301 	int ret;
302 
303 	ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
304 	if (!ldo1)
305 		return -ENOMEM;
306 
307 	ldo1->regmap = arizona->regmap;
308 
309 	/*
310 	 * Since the chip usually supplies itself we provide some
311 	 * default init_data for it.  This will be overridden with
312 	 * platform data if provided.
313 	 */
314 	switch (arizona->type) {
315 	case WM5102:
316 	case WM8997:
317 	case WM8998:
318 	case WM1814:
319 		desc = &arizona_ldo1_hc;
320 		ldo1->init_data = arizona_ldo1_dvfs;
321 		break;
322 	case WM5110:
323 	case WM8280:
324 		desc = &arizona_ldo1;
325 		ldo1->init_data = arizona_ldo1_wm5110;
326 		break;
327 	default:
328 		desc = &arizona_ldo1;
329 		ldo1->init_data = arizona_ldo1_default;
330 		break;
331 	}
332 
333 	ret = arizona_ldo1_common_init(pdev, ldo1, desc,
334 				       &arizona->pdata.ldo1,
335 				       &external_dcvdd);
336 	if (ret == 0)
337 		arizona->external_dcvdd = external_dcvdd;
338 
339 	return ret;
340 }
341 
arizona_ldo1_remove(struct platform_device * pdev)342 static int arizona_ldo1_remove(struct platform_device *pdev)
343 {
344 	struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
345 
346 	if (ldo1->ena_gpiod)
347 		gpiod_put(ldo1->ena_gpiod);
348 
349 	return 0;
350 }
351 
madera_ldo1_probe(struct platform_device * pdev)352 static int madera_ldo1_probe(struct platform_device *pdev)
353 {
354 	struct madera *madera = dev_get_drvdata(pdev->dev.parent);
355 	struct arizona_ldo1 *ldo1;
356 	bool external_dcvdd;
357 	int ret;
358 
359 	ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
360 	if (!ldo1)
361 		return -ENOMEM;
362 
363 	ldo1->regmap = madera->regmap;
364 
365 	ldo1->init_data = madera_ldo1_default;
366 
367 	ret = arizona_ldo1_common_init(pdev, ldo1, &madera_ldo1,
368 				       &madera->pdata.ldo1,
369 				       &external_dcvdd);
370 	if (ret)
371 		return ret;
372 
373 	madera->internal_dcvdd = !external_dcvdd;
374 
375 	return 0;
376 }
377 
378 static struct platform_driver arizona_ldo1_driver = {
379 	.probe = arizona_ldo1_probe,
380 	.remove = arizona_ldo1_remove,
381 	.driver		= {
382 		.name	= "arizona-ldo1",
383 	},
384 };
385 
386 static struct platform_driver madera_ldo1_driver = {
387 	.probe = madera_ldo1_probe,
388 	.remove = arizona_ldo1_remove,
389 	.driver		= {
390 		.name	= "madera-ldo1",
391 	},
392 };
393 
394 static struct platform_driver * const madera_ldo1_drivers[] = {
395 	&arizona_ldo1_driver,
396 	&madera_ldo1_driver,
397 };
398 
arizona_ldo1_init(void)399 static int __init arizona_ldo1_init(void)
400 {
401 	return platform_register_drivers(madera_ldo1_drivers,
402 					 ARRAY_SIZE(madera_ldo1_drivers));
403 }
404 module_init(arizona_ldo1_init);
405 
madera_ldo1_exit(void)406 static void __exit madera_ldo1_exit(void)
407 {
408 	platform_unregister_drivers(madera_ldo1_drivers,
409 				    ARRAY_SIZE(madera_ldo1_drivers));
410 }
411 module_exit(madera_ldo1_exit);
412 
413 /* Module information */
414 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
415 MODULE_DESCRIPTION("Arizona LDO1 driver");
416 MODULE_LICENSE("GPL");
417 MODULE_ALIAS("platform:arizona-ldo1");
418 MODULE_ALIAS("platform:madera-ldo1");
419