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Linux/drivers/regulator/da9052-regulator.c

  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/┬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 
268 static 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 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, 925, 2500, 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, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
354         DA9052_DCDC(BUCK4, 25, 925, 2500, 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                 for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
385                         info = &da9053_regulator_info[i];
386                         if (info->reg_desc.id == id)
387                                 return info;
388                 }
389                 break;
390         }
391 
392         return NULL;
393 }
394 
395 static int da9052_regulator_probe(struct platform_device *pdev)
396 {
397         struct regulator_config config = { };
398         struct da9052_regulator *regulator;
399         struct da9052 *da9052;
400         struct da9052_pdata *pdata;
401 
402         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
403                                  GFP_KERNEL);
404         if (!regulator)
405                 return -ENOMEM;
406 
407         da9052 = dev_get_drvdata(pdev->dev.parent);
408         pdata = dev_get_platdata(da9052->dev);
409         regulator->da9052 = da9052;
410 
411         regulator->info = find_regulator_info(regulator->da9052->chip_id,
412                                               pdev->id);
413         if (regulator->info == NULL) {
414                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
415                 return -EINVAL;
416         }
417 
418         config.dev = &pdev->dev;
419         config.driver_data = regulator;
420         config.regmap = da9052->regmap;
421         if (pdata && pdata->regulators) {
422                 config.init_data = pdata->regulators[pdev->id];
423         } else {
424 #ifdef CONFIG_OF
425                 struct device_node *nproot, *np;
426 
427                 nproot = of_node_get(da9052->dev->of_node);
428                 if (!nproot)
429                         return -ENODEV;
430 
431                 nproot = of_get_child_by_name(nproot, "regulators");
432                 if (!nproot)
433                         return -ENODEV;
434 
435                 for_each_child_of_node(nproot, np) {
436                         if (!of_node_cmp(np->name,
437                                          regulator->info->reg_desc.name)) {
438                                 config.init_data = of_get_regulator_init_data(
439                                         &pdev->dev, np);
440                                 config.of_node = np;
441                                 break;
442                         }
443                 }
444                 of_node_put(nproot);
445 #endif
446         }
447 
448         regulator->rdev = devm_regulator_register(&pdev->dev,
449                                                   &regulator->info->reg_desc,
450                                                   &config);
451         if (IS_ERR(regulator->rdev)) {
452                 dev_err(&pdev->dev, "failed to register regulator %s\n",
453                         regulator->info->reg_desc.name);
454                 return PTR_ERR(regulator->rdev);
455         }
456 
457         platform_set_drvdata(pdev, regulator);
458 
459         return 0;
460 }
461 
462 static struct platform_driver da9052_regulator_driver = {
463         .probe = da9052_regulator_probe,
464         .driver = {
465                 .name = "da9052-regulator",
466                 .owner = THIS_MODULE,
467         },
468 };
469 
470 static int __init da9052_regulator_init(void)
471 {
472         return platform_driver_register(&da9052_regulator_driver);
473 }
474 subsys_initcall(da9052_regulator_init);
475 
476 static void __exit da9052_regulator_exit(void)
477 {
478         platform_driver_unregister(&da9052_regulator_driver);
479 }
480 module_exit(da9052_regulator_exit);
481 
482 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
483 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
484 MODULE_LICENSE("GPL");
485 MODULE_ALIAS("platform:da9052-regulator");
486 

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