1 /*
2 * da9052-regulator.c: Regulator driver for DA9052
3 *
4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 */
14 
15 #include <linux/module.h>
16 #include <linux/moduleparam.h>
17 #include <linux/init.h>
18 #include <linux/err.h>
19 #include <linux/platform_device.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/regulator/machine.h>
22 #ifdef CONFIG_OF
23 #include <linux/of.h>
24 #include <linux/regulator/of_regulator.h>
25 #endif
26 
27 #include <linux/mfd/da9052/da9052.h>
28 #include <linux/mfd/da9052/reg.h>
29 #include <linux/mfd/da9052/pdata.h>
30 
31 /* Buck step size */
32 #define DA9052_BUCK_PERI_3uV_STEP		100000
33 #define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV	24
34 #define DA9052_CONST_3uV			3000000
35 
36 #define DA9052_MIN_UA		0
37 #define DA9052_MAX_UA		3
38 #define DA9052_CURRENT_RANGE	4
39 
40 /* Bit masks */
41 #define DA9052_BUCK_ILIM_MASK_EVEN	0x0c
42 #define DA9052_BUCK_ILIM_MASK_ODD	0xc0
43 
44 /* DA9052 REGULATOR IDs */
45 #define DA9052_ID_BUCK1		0
46 #define DA9052_ID_BUCK2		1
47 #define DA9052_ID_BUCK3		2
48 #define DA9052_ID_BUCK4		3
49 #define DA9052_ID_LDO1		4
50 #define DA9052_ID_LDO2		5
51 #define DA9052_ID_LDO3		6
52 #define DA9052_ID_LDO4		7
53 #define DA9052_ID_LDO5		8
54 #define DA9052_ID_LDO6		9
55 #define DA9052_ID_LDO7		10
56 #define DA9052_ID_LDO8		11
57 #define DA9052_ID_LDO9		12
58 #define DA9052_ID_LDO10		13
59 
60 static const u32 da9052_current_limits[3][4] = {
61 	{700000, 800000, 1000000, 1200000},	/* DA9052-BC BUCKs */
62 	{1600000, 2000000, 2400000, 3000000},	/* DA9053-AA/Bx BUCK-CORE */
63 	{800000, 1000000, 1200000, 1500000},	/* DA9053-AA/Bx BUCK-PRO,
64 						 * BUCK-MEM and BUCK-PERI
65 						*/
66 };
67 
68 struct da9052_regulator_info {
69 	struct regulator_desc reg_desc;
70 	int step_uV;
71 	int min_uV;
72 	int max_uV;
73 	unsigned char activate_bit;
74 };
75 
76 struct da9052_regulator {
77 	struct da9052 *da9052;
78 	struct da9052_regulator_info *info;
79 	struct regulator_dev *rdev;
80 };
81 
82 static int verify_range(struct da9052_regulator_info *info,
83 			 int min_uV, int max_uV)
84 {
85 	if (min_uV > info->max_uV || max_uV < info->min_uV)
86 		return -EINVAL;
87 
88 	return 0;
89 }
90 
91 static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
92 {
93 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
94 	int offset = rdev_get_id(rdev);
95 	int ret, row = 2;
96 
97 	ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
98 	if (ret < 0)
99 		return ret;
100 
101 	/* Determine the even or odd position of the buck current limit
102 	 * register field
103 	*/
104 	if (offset % 2 == 0)
105 		ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
106 	else
107 		ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;
108 
109 	/* Select the appropriate current limit range */
110 	if (regulator->da9052->chip_id == DA9052)
111 		row = 0;
112 	else if (offset == 0)
113 		row = 1;
114 
115 	return da9052_current_limits[row][ret];
116 }
117 
118 static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
119 					  int max_uA)
120 {
121 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
122 	int offset = rdev_get_id(rdev);
123 	int reg_val = 0;
124 	int i, row = 2;
125 
126 	/* Select the appropriate current limit range */
127 	if (regulator->da9052->chip_id == DA9052)
128 		row = 0;
129 	else if (offset == 0)
130 		row = 1;
131 
132 	for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
133 		if ((min_uA <= da9052_current_limits[row][i]) &&
134 		    (da9052_current_limits[row][i] <= max_uA)) {
135 			reg_val = i;
136 			break;
137 		}
138 	}
139 
140 	if (i < 0)
141 		return -EINVAL;
142 
143 	/* Determine the even or odd position of the buck current limit
144 	 * register field
145 	*/
146 	if (offset % 2 == 0)
147 		return da9052_reg_update(regulator->da9052,
148 					 DA9052_BUCKA_REG + offset/2,
149 					 DA9052_BUCK_ILIM_MASK_EVEN,
150 					 reg_val << 2);
151 	else
152 		return da9052_reg_update(regulator->da9052,
153 					 DA9052_BUCKA_REG + offset/2,
154 					 DA9052_BUCK_ILIM_MASK_ODD,
155 					 reg_val << 6);
156 }
157 
158 static int da9052_list_voltage(struct regulator_dev *rdev,
159 				unsigned int selector)
160 {
161 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
162 	struct da9052_regulator_info *info = regulator->info;
163 	int id = rdev_get_id(rdev);
164 	int volt_uV;
165 
166 	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
167 		&& (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
168 		volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
169 			  + info->min_uV);
170 		volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
171 				    * (DA9052_BUCK_PERI_3uV_STEP);
172 	} else {
173 		volt_uV = (selector * info->step_uV) + info->min_uV;
174 	}
175 
176 	if (volt_uV > info->max_uV)
177 		return -EINVAL;
178 
179 	return volt_uV;
180 }
181 
182 static int da9052_map_voltage(struct regulator_dev *rdev,
183 			      int min_uV, int max_uV)
184 {
185 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
186 	struct da9052_regulator_info *info = regulator->info;
187 	int id = rdev_get_id(rdev);
188 	int ret, sel;
189 
190 	ret = verify_range(info, min_uV, max_uV);
191 	if (ret < 0)
192 		return ret;
193 
194 	if (min_uV < info->min_uV)
195 		min_uV = info->min_uV;
196 
197 	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
198 		&& (min_uV >= DA9052_CONST_3uV)) {
199 			sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
200 			      DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
201 					   DA9052_BUCK_PERI_3uV_STEP);
202 	} else {
203 		sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
204 	}
205 
206 	ret = da9052_list_voltage(rdev, sel);
207 	if (ret < 0)
208 		return ret;
209 
210 	return sel;
211 }
212 
213 static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev,
214 					    unsigned int selector)
215 {
216 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
217 	struct da9052_regulator_info *info = regulator->info;
218 	int id = rdev_get_id(rdev);
219 	int ret;
220 
221 	ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg,
222 				rdev->desc->vsel_mask, selector);
223 	if (ret < 0)
224 		return ret;
225 
226 	/* Some LDOs and DCDCs are DVC controlled which requires enabling of
227 	 * the activate bit to implment the changes on the output.
228 	 */
229 	switch (id) {
230 	case DA9052_ID_BUCK1:
231 	case DA9052_ID_BUCK2:
232 	case DA9052_ID_BUCK3:
233 	case DA9052_ID_LDO2:
234 	case DA9052_ID_LDO3:
235 		ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG,
236 					info->activate_bit, info->activate_bit);
237 		break;
238 	}
239 
240 	return ret;
241 }
242 
243 static int da9052_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
244 						 unsigned int old_sel,
245 						 unsigned int new_sel)
246 {
247 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
248 	struct da9052_regulator_info *info = regulator->info;
249 	int id = rdev_get_id(rdev);
250 	int ret = 0;
251 
252 	/* The DVC controlled LDOs and DCDCs ramp with 6.25mV/µs after enabling
253 	 * the activate bit.
254 	 */
255 	switch (id) {
256 	case DA9052_ID_BUCK1:
257 	case DA9052_ID_BUCK2:
258 	case DA9052_ID_BUCK3:
259 	case DA9052_ID_LDO2:
260 	case DA9052_ID_LDO3:
261 		ret = (new_sel - old_sel) * info->step_uV / 6250;
262 		break;
263 	}
264 
265 	return ret;
266 }
267 
268 static const struct regulator_ops da9052_dcdc_ops = {
269 	.get_current_limit = da9052_dcdc_get_current_limit,
270 	.set_current_limit = da9052_dcdc_set_current_limit,
271 
272 	.list_voltage = da9052_list_voltage,
273 	.map_voltage = da9052_map_voltage,
274 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
275 	.set_voltage_sel = da9052_regulator_set_voltage_sel,
276 	.set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
277 	.is_enabled = regulator_is_enabled_regmap,
278 	.enable = regulator_enable_regmap,
279 	.disable = regulator_disable_regmap,
280 };
281 
282 static const struct regulator_ops da9052_ldo_ops = {
283 	.list_voltage = da9052_list_voltage,
284 	.map_voltage = da9052_map_voltage,
285 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
286 	.set_voltage_sel = da9052_regulator_set_voltage_sel,
287 	.set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
288 	.is_enabled = regulator_is_enabled_regmap,
289 	.enable = regulator_enable_regmap,
290 	.disable = regulator_disable_regmap,
291 };
292 
293 #define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
294 {\
295 	.reg_desc = {\
296 		.name = #_id,\
297 		.ops = &da9052_ldo_ops,\
298 		.type = REGULATOR_VOLTAGE,\
299 		.id = DA9052_ID_##_id,\
300 		.n_voltages = (max - min) / step + 1, \
301 		.owner = THIS_MODULE,\
302 		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
303 		.vsel_mask = (1 << (sbits)) - 1,\
304 		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
305 		.enable_mask = 1 << (ebits),\
306 	},\
307 	.min_uV = (min) * 1000,\
308 	.max_uV = (max) * 1000,\
309 	.step_uV = (step) * 1000,\
310 	.activate_bit = (abits),\
311 }
312 
313 #define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
314 {\
315 	.reg_desc = {\
316 		.name = #_id,\
317 		.ops = &da9052_dcdc_ops,\
318 		.type = REGULATOR_VOLTAGE,\
319 		.id = DA9052_ID_##_id,\
320 		.n_voltages = (max - min) / step + 1, \
321 		.owner = THIS_MODULE,\
322 		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
323 		.vsel_mask = (1 << (sbits)) - 1,\
324 		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
325 		.enable_mask = 1 << (ebits),\
326 	},\
327 	.min_uV = (min) * 1000,\
328 	.max_uV = (max) * 1000,\
329 	.step_uV = (step) * 1000,\
330 	.activate_bit = (abits),\
331 }
332 
333 static struct da9052_regulator_info da9052_regulator_info[] = {
334 	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
335 	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
336 	DA9052_DCDC(BUCK3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
337 	DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
338 	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
339 	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
340 	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
341 	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
342 	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
343 	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
344 	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
345 	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
346 	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
347 	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
348 };
349 
350 static struct da9052_regulator_info da9053_regulator_info[] = {
351 	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
352 	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
353 	DA9052_DCDC(BUCK3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
354 	DA9052_DCDC(BUCK4, 25, 950, 2525, 6, 6, 0),
355 	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
356 	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
357 	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
358 	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
359 	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
360 	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
361 	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
362 	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
363 	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
364 	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
365 };
366 
367 static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
368 								 int id)
369 {
370 	struct da9052_regulator_info *info;
371 	int i;
372 
373 	switch (chip_id) {
374 	case DA9052:
375 		for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
376 			info = &da9052_regulator_info[i];
377 			if (info->reg_desc.id == id)
378 				return info;
379 		}
380 		break;
381 	case DA9053_AA:
382 	case DA9053_BA:
383 	case DA9053_BB:
384 	case DA9053_BC:
385 		for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
386 			info = &da9053_regulator_info[i];
387 			if (info->reg_desc.id == id)
388 				return info;
389 		}
390 		break;
391 	}
392 
393 	return NULL;
394 }
395 
396 static int da9052_regulator_probe(struct platform_device *pdev)
397 {
398 	const struct mfd_cell *cell = mfd_get_cell(pdev);
399 	struct regulator_config config = { };
400 	struct da9052_regulator *regulator;
401 	struct da9052 *da9052;
402 	struct da9052_pdata *pdata;
403 
404 	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
405 				 GFP_KERNEL);
406 	if (!regulator)
407 		return -ENOMEM;
408 
409 	da9052 = dev_get_drvdata(pdev->dev.parent);
410 	pdata = dev_get_platdata(da9052->dev);
411 	regulator->da9052 = da9052;
412 
413 	regulator->info = find_regulator_info(regulator->da9052->chip_id,
414 					      cell->id);
415 	if (regulator->info == NULL) {
416 		dev_err(&pdev->dev, "invalid regulator ID specified\n");
417 		return -EINVAL;
418 	}
419 
420 	config.dev = &pdev->dev;
421 	config.driver_data = regulator;
422 	config.regmap = da9052->regmap;
423 	if (pdata && pdata->regulators) {
424 		config.init_data = pdata->regulators[cell->id];
425 	} else {
426 #ifdef CONFIG_OF
427 		struct device_node *nproot = da9052->dev->of_node;
428 		struct device_node *np;
429 
430 		if (!nproot)
431 			return -ENODEV;
432 
433 		nproot = of_get_child_by_name(nproot, "regulators");
434 		if (!nproot)
435 			return -ENODEV;
436 
437 		for_each_child_of_node(nproot, np) {
438 			if (!of_node_cmp(np->name,
439 					 regulator->info->reg_desc.name)) {
440 				config.init_data = of_get_regulator_init_data(
441 					&pdev->dev, np,
442 					&regulator->info->reg_desc);
443 				config.of_node = np;
444 				break;
445 			}
446 		}
447 		of_node_put(nproot);
448 #endif
449 	}
450 
451 	regulator->rdev = devm_regulator_register(&pdev->dev,
452 						  &regulator->info->reg_desc,
453 						  &config);
454 	if (IS_ERR(regulator->rdev)) {
455 		dev_err(&pdev->dev, "failed to register regulator %s\n",
456 			regulator->info->reg_desc.name);
457 		return PTR_ERR(regulator->rdev);
458 	}
459 
460 	platform_set_drvdata(pdev, regulator);
461 
462 	return 0;
463 }
464 
465 static struct platform_driver da9052_regulator_driver = {
466 	.probe = da9052_regulator_probe,
467 	.driver = {
468 		.name = "da9052-regulator",
469 	},
470 };
471 
472 static int __init da9052_regulator_init(void)
473 {
474 	return platform_driver_register(&da9052_regulator_driver);
475 }
476 subsys_initcall(da9052_regulator_init);
477 
478 static void __exit da9052_regulator_exit(void)
479 {
480 	platform_driver_unregister(&da9052_regulator_driver);
481 }
482 module_exit(da9052_regulator_exit);
483 
484 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
485 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
486 MODULE_LICENSE("GPL");
487 MODULE_ALIAS("platform:da9052-regulator");
488