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
60static 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
68struct 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
76struct da9052_regulator {
77 struct da9052 *da9052;
78 struct da9052_regulator_info *info;
79 struct regulator_dev *rdev;
80};
81
82static 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
91static 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
118static 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
158static 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
182static 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
213static 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
243static 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/┬Ás 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
268static 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
282static 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, _name, step, min, max, sbits, ebits, abits) \
294{\
295 .reg_desc = {\
296 .name = #_name,\
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, _name, step, min, max, sbits, ebits, abits) \
314{\
315 .reg_desc = {\
316 .name = #_name,\
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
333static struct da9052_regulator_info da9052_regulator_info[] = {
334 DA9052_DCDC(BUCK1, buck1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
335 DA9052_DCDC(BUCK2, buck2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
336 DA9052_DCDC(BUCK3, buck3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
337 DA9052_DCDC(BUCK4, buck4, 50, 1800, 3600, 5, 6, 0),
338 DA9052_LDO(LDO1, ldo1, 50, 600, 1800, 5, 6, 0),
339 DA9052_LDO(LDO2, ldo2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
340 DA9052_LDO(LDO3, ldo3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
341 DA9052_LDO(LDO4, ldo4, 25, 1725, 3300, 6, 6, 0),
342 DA9052_LDO(LDO5, ldo5, 50, 1200, 3600, 6, 6, 0),
343 DA9052_LDO(LDO6, ldo6, 50, 1200, 3600, 6, 6, 0),
344 DA9052_LDO(LDO7, ldo7, 50, 1200, 3600, 6, 6, 0),
345 DA9052_LDO(LDO8, ldo8, 50, 1200, 3600, 6, 6, 0),
346 DA9052_LDO(LDO9, ldo9, 50, 1250, 3650, 6, 6, 0),
347 DA9052_LDO(LDO10, ldo10, 50, 1200, 3600, 6, 6, 0),
348};
349
350static struct da9052_regulator_info da9053_regulator_info[] = {
351 DA9052_DCDC(BUCK1, buck1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
352 DA9052_DCDC(BUCK2, buck2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
353 DA9052_DCDC(BUCK3, buck3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
354 DA9052_DCDC(BUCK4, buck4, 25, 950, 2525, 6, 6, 0),
355 DA9052_LDO(LDO1, ldo1, 50, 600, 1800, 5, 6, 0),
356 DA9052_LDO(LDO2, ldo2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
357 DA9052_LDO(LDO3, ldo3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
358 DA9052_LDO(LDO4, ldo4, 25, 1725, 3300, 6, 6, 0),
359 DA9052_LDO(LDO5, ldo5, 50, 1200, 3600, 6, 6, 0),
360 DA9052_LDO(LDO6, ldo6, 50, 1200, 3600, 6, 6, 0),
361 DA9052_LDO(LDO7, ldo7, 50, 1200, 3600, 6, 6, 0),
362 DA9052_LDO(LDO8, ldo8, 50, 1200, 3600, 6, 6, 0),
363 DA9052_LDO(LDO9, ldo9, 50, 1250, 3650, 6, 6, 0),
364 DA9052_LDO(LDO10, ldo10, 50, 1200, 3600, 6, 6, 0),
365};
366
367static 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
396static 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) {
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_name_eq(np,
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
465static struct platform_driver da9052_regulator_driver = {
466 .probe = da9052_regulator_probe,
467 .driver = {
468 .name = "da9052-regulator",
469 },
470};
471
472static int __init da9052_regulator_init(void)
473{
474 return platform_driver_register(&da9052_regulator_driver);
475}
476subsys_initcall(da9052_regulator_init);
477
478static void __exit da9052_regulator_exit(void)
479{
480 platform_driver_unregister(&da9052_regulator_driver);
481}
482module_exit(da9052_regulator_exit);
483
484MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
485MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
486MODULE_LICENSE("GPL");
487MODULE_ALIAS("platform:da9052-regulator");
488