1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // da9052-regulator.c: Regulator driver for DA9052
4 //
5 // Copyright(c) 2011 Dialog Semiconductor Ltd.
6 //
7 // Author: David Dajun Chen <dchen@diasemi.com>
8 
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/init.h>
12 #include <linux/err.h>
13 #include <linux/platform_device.h>
14 #include <linux/regulator/driver.h>
15 #include <linux/regulator/machine.h>
16 #include <linux/of.h>
17 #include <linux/regulator/of_regulator.h>
18 
19 #include <linux/mfd/da9052/da9052.h>
20 #include <linux/mfd/da9052/reg.h>
21 #include <linux/mfd/da9052/pdata.h>
22 
23 /* Buck step size */
24 #define DA9052_BUCK_PERI_3uV_STEP		100000
25 #define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV	24
26 #define DA9052_CONST_3uV			3000000
27 
28 #define DA9052_MIN_UA		0
29 #define DA9052_MAX_UA		3
30 #define DA9052_CURRENT_RANGE	4
31 
32 /* Bit masks */
33 #define DA9052_BUCK_ILIM_MASK_EVEN	0x0c
34 #define DA9052_BUCK_ILIM_MASK_ODD	0xc0
35 
36 /* DA9052 REGULATOR IDs */
37 #define DA9052_ID_BUCK1		0
38 #define DA9052_ID_BUCK2		1
39 #define DA9052_ID_BUCK3		2
40 #define DA9052_ID_BUCK4		3
41 #define DA9052_ID_LDO1		4
42 #define DA9052_ID_LDO2		5
43 #define DA9052_ID_LDO3		6
44 #define DA9052_ID_LDO4		7
45 #define DA9052_ID_LDO5		8
46 #define DA9052_ID_LDO6		9
47 #define DA9052_ID_LDO7		10
48 #define DA9052_ID_LDO8		11
49 #define DA9052_ID_LDO9		12
50 #define DA9052_ID_LDO10		13
51 
52 static const u32 da9052_current_limits[3][4] = {
53 	{700000, 800000, 1000000, 1200000},	/* DA9052-BC BUCKs */
54 	{1600000, 2000000, 2400000, 3000000},	/* DA9053-AA/Bx BUCK-CORE */
55 	{800000, 1000000, 1200000, 1500000},	/* DA9053-AA/Bx BUCK-PRO,
56 						 * BUCK-MEM and BUCK-PERI
57 						*/
58 };
59 
60 struct da9052_regulator_info {
61 	struct regulator_desc reg_desc;
62 	int step_uV;
63 	int min_uV;
64 	int max_uV;
65 	unsigned char activate_bit;
66 };
67 
68 struct da9052_regulator {
69 	struct da9052 *da9052;
70 	struct da9052_regulator_info *info;
71 	struct regulator_dev *rdev;
72 };
73 
74 static int verify_range(struct da9052_regulator_info *info,
75 			 int min_uV, int max_uV)
76 {
77 	if (min_uV > info->max_uV || max_uV < info->min_uV)
78 		return -EINVAL;
79 
80 	return 0;
81 }
82 
83 static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
84 {
85 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
86 	int offset = rdev_get_id(rdev);
87 	int ret, row = 2;
88 
89 	ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
90 	if (ret < 0)
91 		return ret;
92 
93 	/* Determine the even or odd position of the buck current limit
94 	 * register field
95 	*/
96 	if (offset % 2 == 0)
97 		ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
98 	else
99 		ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;
100 
101 	/* Select the appropriate current limit range */
102 	if (regulator->da9052->chip_id == DA9052)
103 		row = 0;
104 	else if (offset == 0)
105 		row = 1;
106 
107 	return da9052_current_limits[row][ret];
108 }
109 
110 static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
111 					  int max_uA)
112 {
113 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
114 	int offset = rdev_get_id(rdev);
115 	int reg_val = 0;
116 	int i, row = 2;
117 
118 	/* Select the appropriate current limit range */
119 	if (regulator->da9052->chip_id == DA9052)
120 		row = 0;
121 	else if (offset == 0)
122 		row = 1;
123 
124 	for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
125 		if ((min_uA <= da9052_current_limits[row][i]) &&
126 		    (da9052_current_limits[row][i] <= max_uA)) {
127 			reg_val = i;
128 			break;
129 		}
130 	}
131 
132 	if (i < 0)
133 		return -EINVAL;
134 
135 	/* Determine the even or odd position of the buck current limit
136 	 * register field
137 	*/
138 	if (offset % 2 == 0)
139 		return da9052_reg_update(regulator->da9052,
140 					 DA9052_BUCKA_REG + offset/2,
141 					 DA9052_BUCK_ILIM_MASK_EVEN,
142 					 reg_val << 2);
143 	else
144 		return da9052_reg_update(regulator->da9052,
145 					 DA9052_BUCKA_REG + offset/2,
146 					 DA9052_BUCK_ILIM_MASK_ODD,
147 					 reg_val << 6);
148 }
149 
150 static int da9052_list_voltage(struct regulator_dev *rdev,
151 				unsigned int selector)
152 {
153 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
154 	struct da9052_regulator_info *info = regulator->info;
155 	int id = rdev_get_id(rdev);
156 	int volt_uV;
157 
158 	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
159 		&& (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
160 		volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
161 			  + info->min_uV);
162 		volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
163 				    * (DA9052_BUCK_PERI_3uV_STEP);
164 	} else {
165 		volt_uV = (selector * info->step_uV) + info->min_uV;
166 	}
167 
168 	if (volt_uV > info->max_uV)
169 		return -EINVAL;
170 
171 	return volt_uV;
172 }
173 
174 static int da9052_map_voltage(struct regulator_dev *rdev,
175 			      int min_uV, int max_uV)
176 {
177 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
178 	struct da9052_regulator_info *info = regulator->info;
179 	int id = rdev_get_id(rdev);
180 	int ret, sel;
181 
182 	ret = verify_range(info, min_uV, max_uV);
183 	if (ret < 0)
184 		return ret;
185 
186 	if (min_uV < info->min_uV)
187 		min_uV = info->min_uV;
188 
189 	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
190 		&& (min_uV >= DA9052_CONST_3uV)) {
191 			sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
192 			      DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
193 					   DA9052_BUCK_PERI_3uV_STEP);
194 	} else {
195 		sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
196 	}
197 
198 	ret = da9052_list_voltage(rdev, sel);
199 	if (ret < 0)
200 		return ret;
201 
202 	return sel;
203 }
204 
205 static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev,
206 					    unsigned int selector)
207 {
208 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
209 	struct da9052_regulator_info *info = regulator->info;
210 	int id = rdev_get_id(rdev);
211 	int ret;
212 
213 	ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg,
214 				rdev->desc->vsel_mask, selector);
215 	if (ret < 0)
216 		return ret;
217 
218 	/* Some LDOs and DCDCs are DVC controlled which requires enabling of
219 	 * the activate bit to implment the changes on the output.
220 	 */
221 	switch (id) {
222 	case DA9052_ID_BUCK1:
223 	case DA9052_ID_BUCK2:
224 	case DA9052_ID_BUCK3:
225 	case DA9052_ID_LDO2:
226 	case DA9052_ID_LDO3:
227 		ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG,
228 					info->activate_bit, info->activate_bit);
229 		break;
230 	}
231 
232 	return ret;
233 }
234 
235 static int da9052_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
236 						 unsigned int old_sel,
237 						 unsigned int new_sel)
238 {
239 	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
240 	struct da9052_regulator_info *info = regulator->info;
241 	int id = rdev_get_id(rdev);
242 	int ret = 0;
243 
244 	/* The DVC controlled LDOs and DCDCs ramp with 6.25mV/µs after enabling
245 	 * the activate bit.
246 	 */
247 	switch (id) {
248 	case DA9052_ID_BUCK1:
249 	case DA9052_ID_BUCK2:
250 	case DA9052_ID_BUCK3:
251 	case DA9052_ID_LDO2:
252 	case DA9052_ID_LDO3:
253 		ret = DIV_ROUND_UP(abs(new_sel - old_sel) * info->step_uV,
254 				   6250);
255 		break;
256 	}
257 
258 	return ret;
259 }
260 
261 static const struct regulator_ops da9052_dcdc_ops = {
262 	.get_current_limit = da9052_dcdc_get_current_limit,
263 	.set_current_limit = da9052_dcdc_set_current_limit,
264 
265 	.list_voltage = da9052_list_voltage,
266 	.map_voltage = da9052_map_voltage,
267 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
268 	.set_voltage_sel = da9052_regulator_set_voltage_sel,
269 	.set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
270 	.is_enabled = regulator_is_enabled_regmap,
271 	.enable = regulator_enable_regmap,
272 	.disable = regulator_disable_regmap,
273 };
274 
275 static const struct regulator_ops da9052_ldo_ops = {
276 	.list_voltage = da9052_list_voltage,
277 	.map_voltage = da9052_map_voltage,
278 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
279 	.set_voltage_sel = da9052_regulator_set_voltage_sel,
280 	.set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
281 	.is_enabled = regulator_is_enabled_regmap,
282 	.enable = regulator_enable_regmap,
283 	.disable = regulator_disable_regmap,
284 };
285 
286 #define DA9052_LDO(_id, _name, step, min, max, sbits, ebits, abits) \
287 {\
288 	.reg_desc = {\
289 		.name = #_name,\
290 		.of_match = of_match_ptr(#_name),\
291 		.regulators_node = of_match_ptr("regulators"),\
292 		.ops = &da9052_ldo_ops,\
293 		.type = REGULATOR_VOLTAGE,\
294 		.id = DA9052_ID_##_id,\
295 		.n_voltages = (max - min) / step + 1, \
296 		.owner = THIS_MODULE,\
297 		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
298 		.vsel_mask = (1 << (sbits)) - 1,\
299 		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
300 		.enable_mask = 1 << (ebits),\
301 	},\
302 	.min_uV = (min) * 1000,\
303 	.max_uV = (max) * 1000,\
304 	.step_uV = (step) * 1000,\
305 	.activate_bit = (abits),\
306 }
307 
308 #define DA9052_DCDC(_id, _name, step, min, max, sbits, ebits, abits) \
309 {\
310 	.reg_desc = {\
311 		.name = #_name,\
312 		.of_match = of_match_ptr(#_name),\
313 		.regulators_node = of_match_ptr("regulators"),\
314 		.ops = &da9052_dcdc_ops,\
315 		.type = REGULATOR_VOLTAGE,\
316 		.id = DA9052_ID_##_id,\
317 		.n_voltages = (max - min) / step + 1, \
318 		.owner = THIS_MODULE,\
319 		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
320 		.vsel_mask = (1 << (sbits)) - 1,\
321 		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
322 		.enable_mask = 1 << (ebits),\
323 	},\
324 	.min_uV = (min) * 1000,\
325 	.max_uV = (max) * 1000,\
326 	.step_uV = (step) * 1000,\
327 	.activate_bit = (abits),\
328 }
329 
330 static struct da9052_regulator_info da9052_regulator_info[] = {
331 	DA9052_DCDC(BUCK1, buck1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
332 	DA9052_DCDC(BUCK2, buck2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
333 	DA9052_DCDC(BUCK3, buck3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
334 	DA9052_DCDC(BUCK4, buck4, 50, 1800, 3600, 5, 6, 0),
335 	DA9052_LDO(LDO1, ldo1, 50, 600, 1800, 5, 6, 0),
336 	DA9052_LDO(LDO2, ldo2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
337 	DA9052_LDO(LDO3, ldo3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
338 	DA9052_LDO(LDO4, ldo4, 25, 1725, 3300, 6, 6, 0),
339 	DA9052_LDO(LDO5, ldo5, 50, 1200, 3600, 6, 6, 0),
340 	DA9052_LDO(LDO6, ldo6, 50, 1200, 3600, 6, 6, 0),
341 	DA9052_LDO(LDO7, ldo7, 50, 1200, 3600, 6, 6, 0),
342 	DA9052_LDO(LDO8, ldo8, 50, 1200, 3600, 6, 6, 0),
343 	DA9052_LDO(LDO9, ldo9, 50, 1250, 3650, 6, 6, 0),
344 	DA9052_LDO(LDO10, ldo10, 50, 1200, 3600, 6, 6, 0),
345 };
346 
347 static struct da9052_regulator_info da9053_regulator_info[] = {
348 	DA9052_DCDC(BUCK1, buck1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
349 	DA9052_DCDC(BUCK2, buck2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
350 	DA9052_DCDC(BUCK3, buck3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
351 	DA9052_DCDC(BUCK4, buck4, 25, 950, 2525, 6, 6, 0),
352 	DA9052_LDO(LDO1, ldo1, 50, 600, 1800, 5, 6, 0),
353 	DA9052_LDO(LDO2, ldo2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
354 	DA9052_LDO(LDO3, ldo3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
355 	DA9052_LDO(LDO4, ldo4, 25, 1725, 3300, 6, 6, 0),
356 	DA9052_LDO(LDO5, ldo5, 50, 1200, 3600, 6, 6, 0),
357 	DA9052_LDO(LDO6, ldo6, 50, 1200, 3600, 6, 6, 0),
358 	DA9052_LDO(LDO7, ldo7, 50, 1200, 3600, 6, 6, 0),
359 	DA9052_LDO(LDO8, ldo8, 50, 1200, 3600, 6, 6, 0),
360 	DA9052_LDO(LDO9, ldo9, 50, 1250, 3650, 6, 6, 0),
361 	DA9052_LDO(LDO10, ldo10, 50, 1200, 3600, 6, 6, 0),
362 };
363 
364 static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
365 								 int id)
366 {
367 	struct da9052_regulator_info *info;
368 	int i;
369 
370 	switch (chip_id) {
371 	case DA9052:
372 		for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
373 			info = &da9052_regulator_info[i];
374 			if (info->reg_desc.id == id)
375 				return info;
376 		}
377 		break;
378 	case DA9053_AA:
379 	case DA9053_BA:
380 	case DA9053_BB:
381 	case DA9053_BC:
382 		for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
383 			info = &da9053_regulator_info[i];
384 			if (info->reg_desc.id == id)
385 				return info;
386 		}
387 		break;
388 	}
389 
390 	return NULL;
391 }
392 
393 static int da9052_regulator_probe(struct platform_device *pdev)
394 {
395 	const struct mfd_cell *cell = mfd_get_cell(pdev);
396 	struct regulator_config config = { };
397 	struct da9052_regulator *regulator;
398 	struct da9052 *da9052;
399 	struct da9052_pdata *pdata;
400 
401 	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
402 				 GFP_KERNEL);
403 	if (!regulator)
404 		return -ENOMEM;
405 
406 	da9052 = dev_get_drvdata(pdev->dev.parent);
407 	pdata = dev_get_platdata(da9052->dev);
408 	regulator->da9052 = da9052;
409 
410 	regulator->info = find_regulator_info(regulator->da9052->chip_id,
411 					      cell->id);
412 	if (regulator->info == NULL) {
413 		dev_err(&pdev->dev, "invalid regulator ID specified\n");
414 		return -EINVAL;
415 	}
416 
417 	config.dev = da9052->dev;
418 	config.driver_data = regulator;
419 	config.regmap = da9052->regmap;
420 	if (pdata)
421 		config.init_data = pdata->regulators[cell->id];
422 
423 	regulator->rdev = devm_regulator_register(&pdev->dev,
424 						  &regulator->info->reg_desc,
425 						  &config);
426 	if (IS_ERR(regulator->rdev)) {
427 		dev_err(&pdev->dev, "failed to register regulator %s\n",
428 			regulator->info->reg_desc.name);
429 		return PTR_ERR(regulator->rdev);
430 	}
431 
432 	platform_set_drvdata(pdev, regulator);
433 
434 	return 0;
435 }
436 
437 static struct platform_driver da9052_regulator_driver = {
438 	.probe = da9052_regulator_probe,
439 	.driver = {
440 		.name = "da9052-regulator",
441 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
442 	},
443 };
444 
445 static int __init da9052_regulator_init(void)
446 {
447 	return platform_driver_register(&da9052_regulator_driver);
448 }
449 subsys_initcall(da9052_regulator_init);
450 
451 static void __exit da9052_regulator_exit(void)
452 {
453 	platform_driver_unregister(&da9052_regulator_driver);
454 }
455 module_exit(da9052_regulator_exit);
456 
457 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
458 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
459 MODULE_LICENSE("GPL");
460 MODULE_ALIAS("platform:da9052-regulator");
461