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Linux/drivers/regulator/tps6507x-regulator.c

  1 /*
  2  * tps6507x-regulator.c
  3  *
  4  * Regulator driver for TPS65073 PMIC
  5  *
  6  * Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.com/
  7  *
  8  * This program is free software; you can redistribute it and/or
  9  * modify it under the terms of the GNU General Public License as
 10  * published by the Free Software Foundation version 2.
 11  *
 12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
 13  * whether express or implied; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 15  * General Public License for more details.
 16  */
 17 
 18 #include <linux/kernel.h>
 19 #include <linux/module.h>
 20 #include <linux/init.h>
 21 #include <linux/err.h>
 22 #include <linux/platform_device.h>
 23 #include <linux/regulator/driver.h>
 24 #include <linux/regulator/machine.h>
 25 #include <linux/regulator/tps6507x.h>
 26 #include <linux/of.h>
 27 #include <linux/slab.h>
 28 #include <linux/mfd/tps6507x.h>
 29 #include <linux/regulator/of_regulator.h>
 30 
 31 /* DCDC's */
 32 #define TPS6507X_DCDC_1                         0
 33 #define TPS6507X_DCDC_2                         1
 34 #define TPS6507X_DCDC_3                         2
 35 /* LDOs */
 36 #define TPS6507X_LDO_1                          3
 37 #define TPS6507X_LDO_2                          4
 38 
 39 #define TPS6507X_MAX_REG_ID                     TPS6507X_LDO_2
 40 
 41 /* Number of step-down converters available */
 42 #define TPS6507X_NUM_DCDC                       3
 43 /* Number of LDO voltage regulators  available */
 44 #define TPS6507X_NUM_LDO                        2
 45 /* Number of total regulators available */
 46 #define TPS6507X_NUM_REGULATOR          (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
 47 
 48 /* Supported voltage values for regulators (in microVolts) */
 49 static const unsigned int VDCDCx_VSEL_table[] = {
 50         725000, 750000, 775000, 800000,
 51         825000, 850000, 875000, 900000,
 52         925000, 950000, 975000, 1000000,
 53         1025000, 1050000, 1075000, 1100000,
 54         1125000, 1150000, 1175000, 1200000,
 55         1225000, 1250000, 1275000, 1300000,
 56         1325000, 1350000, 1375000, 1400000,
 57         1425000, 1450000, 1475000, 1500000,
 58         1550000, 1600000, 1650000, 1700000,
 59         1750000, 1800000, 1850000, 1900000,
 60         1950000, 2000000, 2050000, 2100000,
 61         2150000, 2200000, 2250000, 2300000,
 62         2350000, 2400000, 2450000, 2500000,
 63         2550000, 2600000, 2650000, 2700000,
 64         2750000, 2800000, 2850000, 2900000,
 65         3000000, 3100000, 3200000, 3300000,
 66 };
 67 
 68 static const unsigned int LDO1_VSEL_table[] = {
 69         1000000, 1100000, 1200000, 1250000,
 70         1300000, 1350000, 1400000, 1500000,
 71         1600000, 1800000, 2500000, 2750000,
 72         2800000, 3000000, 3100000, 3300000,
 73 };
 74 
 75 /* The voltage mapping table for LDO2 is the same as VDCDCx */
 76 #define LDO2_VSEL_table VDCDCx_VSEL_table
 77 
 78 struct tps_info {
 79         const char *name;
 80         u8 table_len;
 81         const unsigned int *table;
 82 
 83         /* Does DCDC high or the low register defines output voltage? */
 84         bool defdcdc_default;
 85 };
 86 
 87 static struct tps_info tps6507x_pmic_regs[] = {
 88         {
 89                 .name = "VDCDC1",
 90                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 91                 .table = VDCDCx_VSEL_table,
 92         },
 93         {
 94                 .name = "VDCDC2",
 95                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 96                 .table = VDCDCx_VSEL_table,
 97         },
 98         {
 99                 .name = "VDCDC3",
100                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
101                 .table = VDCDCx_VSEL_table,
102         },
103         {
104                 .name = "LDO1",
105                 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
106                 .table = LDO1_VSEL_table,
107         },
108         {
109                 .name = "LDO2",
110                 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
111                 .table = LDO2_VSEL_table,
112         },
113 };
114 
115 struct tps6507x_pmic {
116         struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
117         struct tps6507x_dev *mfd;
118         struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
119         struct tps_info *info[TPS6507X_NUM_REGULATOR];
120         struct mutex io_lock;
121 };
122 static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
123 {
124         u8 val;
125         int err;
126 
127         err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
128 
129         if (err)
130                 return err;
131 
132         return val;
133 }
134 
135 static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
136 {
137         return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
138 }
139 
140 static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
141 {
142         int err, data;
143 
144         mutex_lock(&tps->io_lock);
145 
146         data = tps6507x_pmic_read(tps, reg);
147         if (data < 0) {
148                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
149                 err = data;
150                 goto out;
151         }
152 
153         data |= mask;
154         err = tps6507x_pmic_write(tps, reg, data);
155         if (err)
156                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
157 
158 out:
159         mutex_unlock(&tps->io_lock);
160         return err;
161 }
162 
163 static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
164 {
165         int err, data;
166 
167         mutex_lock(&tps->io_lock);
168 
169         data = tps6507x_pmic_read(tps, reg);
170         if (data < 0) {
171                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
172                 err = data;
173                 goto out;
174         }
175 
176         data &= ~mask;
177         err = tps6507x_pmic_write(tps, reg, data);
178         if (err)
179                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
180 
181 out:
182         mutex_unlock(&tps->io_lock);
183         return err;
184 }
185 
186 static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
187 {
188         int data;
189 
190         mutex_lock(&tps->io_lock);
191 
192         data = tps6507x_pmic_read(tps, reg);
193         if (data < 0)
194                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
195 
196         mutex_unlock(&tps->io_lock);
197         return data;
198 }
199 
200 static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
201 {
202         int err;
203 
204         mutex_lock(&tps->io_lock);
205 
206         err = tps6507x_pmic_write(tps, reg, val);
207         if (err < 0)
208                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
209 
210         mutex_unlock(&tps->io_lock);
211         return err;
212 }
213 
214 static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
215 {
216         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
217         int data, rid = rdev_get_id(dev);
218         u8 shift;
219 
220         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
221                 return -EINVAL;
222 
223         shift = TPS6507X_MAX_REG_ID - rid;
224         data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
225 
226         if (data < 0)
227                 return data;
228         else
229                 return (data & 1<<shift) ? 1 : 0;
230 }
231 
232 static int tps6507x_pmic_enable(struct regulator_dev *dev)
233 {
234         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
235         int rid = rdev_get_id(dev);
236         u8 shift;
237 
238         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
239                 return -EINVAL;
240 
241         shift = TPS6507X_MAX_REG_ID - rid;
242         return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
243 }
244 
245 static int tps6507x_pmic_disable(struct regulator_dev *dev)
246 {
247         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
248         int rid = rdev_get_id(dev);
249         u8 shift;
250 
251         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
252                 return -EINVAL;
253 
254         shift = TPS6507X_MAX_REG_ID - rid;
255         return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
256                                         1 << shift);
257 }
258 
259 static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
260 {
261         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
262         int data, rid = rdev_get_id(dev);
263         u8 reg, mask;
264 
265         switch (rid) {
266         case TPS6507X_DCDC_1:
267                 reg = TPS6507X_REG_DEFDCDC1;
268                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
269                 break;
270         case TPS6507X_DCDC_2:
271                 if (tps->info[rid]->defdcdc_default)
272                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
273                 else
274                         reg = TPS6507X_REG_DEFDCDC2_LOW;
275                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
276                 break;
277         case TPS6507X_DCDC_3:
278                 if (tps->info[rid]->defdcdc_default)
279                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
280                 else
281                         reg = TPS6507X_REG_DEFDCDC3_LOW;
282                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
283                 break;
284         case TPS6507X_LDO_1:
285                 reg = TPS6507X_REG_LDO_CTRL1;
286                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
287                 break;
288         case TPS6507X_LDO_2:
289                 reg = TPS6507X_REG_DEFLDO2;
290                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
291                 break;
292         default:
293                 return -EINVAL;
294         }
295 
296         data = tps6507x_pmic_reg_read(tps, reg);
297         if (data < 0)
298                 return data;
299 
300         data &= mask;
301         return data;
302 }
303 
304 static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
305                                           unsigned selector)
306 {
307         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
308         int data, rid = rdev_get_id(dev);
309         u8 reg, mask;
310 
311         switch (rid) {
312         case TPS6507X_DCDC_1:
313                 reg = TPS6507X_REG_DEFDCDC1;
314                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
315                 break;
316         case TPS6507X_DCDC_2:
317                 if (tps->info[rid]->defdcdc_default)
318                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
319                 else
320                         reg = TPS6507X_REG_DEFDCDC2_LOW;
321                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
322                 break;
323         case TPS6507X_DCDC_3:
324                 if (tps->info[rid]->defdcdc_default)
325                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
326                 else
327                         reg = TPS6507X_REG_DEFDCDC3_LOW;
328                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
329                 break;
330         case TPS6507X_LDO_1:
331                 reg = TPS6507X_REG_LDO_CTRL1;
332                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
333                 break;
334         case TPS6507X_LDO_2:
335                 reg = TPS6507X_REG_DEFLDO2;
336                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
337                 break;
338         default:
339                 return -EINVAL;
340         }
341 
342         data = tps6507x_pmic_reg_read(tps, reg);
343         if (data < 0)
344                 return data;
345 
346         data &= ~mask;
347         data |= selector;
348 
349         return tps6507x_pmic_reg_write(tps, reg, data);
350 }
351 
352 static struct regulator_ops tps6507x_pmic_ops = {
353         .is_enabled = tps6507x_pmic_is_enabled,
354         .enable = tps6507x_pmic_enable,
355         .disable = tps6507x_pmic_disable,
356         .get_voltage_sel = tps6507x_pmic_get_voltage_sel,
357         .set_voltage_sel = tps6507x_pmic_set_voltage_sel,
358         .list_voltage = regulator_list_voltage_table,
359         .map_voltage = regulator_map_voltage_ascend,
360 };
361 
362 static struct of_regulator_match tps6507x_matches[] = {
363         { .name = "VDCDC1"},
364         { .name = "VDCDC2"},
365         { .name = "VDCDC3"},
366         { .name = "LDO1"},
367         { .name = "LDO2"},
368 };
369 
370 static struct tps6507x_board *tps6507x_parse_dt_reg_data(
371                 struct platform_device *pdev,
372                 struct of_regulator_match **tps6507x_reg_matches)
373 {
374         struct tps6507x_board *tps_board;
375         struct device_node *np = pdev->dev.parent->of_node;
376         struct device_node *regulators;
377         struct of_regulator_match *matches;
378         static struct regulator_init_data *reg_data;
379         int idx = 0, count, ret;
380 
381         tps_board = devm_kzalloc(&pdev->dev, sizeof(*tps_board),
382                                         GFP_KERNEL);
383         if (!tps_board)
384                 return NULL;
385 
386         regulators = of_get_child_by_name(np, "regulators");
387         if (!regulators) {
388                 dev_err(&pdev->dev, "regulator node not found\n");
389                 return NULL;
390         }
391 
392         count = ARRAY_SIZE(tps6507x_matches);
393         matches = tps6507x_matches;
394 
395         ret = of_regulator_match(&pdev->dev, regulators, matches, count);
396         of_node_put(regulators);
397         if (ret < 0) {
398                 dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
399                         ret);
400                 return NULL;
401         }
402 
403         *tps6507x_reg_matches = matches;
404 
405         reg_data = devm_kzalloc(&pdev->dev, (sizeof(struct regulator_init_data)
406                                         * TPS6507X_NUM_REGULATOR), GFP_KERNEL);
407         if (!reg_data)
408                 return NULL;
409 
410         tps_board->tps6507x_pmic_init_data = reg_data;
411 
412         for (idx = 0; idx < count; idx++) {
413                 if (!matches[idx].init_data || !matches[idx].of_node)
414                         continue;
415 
416                 memcpy(&reg_data[idx], matches[idx].init_data,
417                                 sizeof(struct regulator_init_data));
418 
419         }
420 
421         return tps_board;
422 }
423 
424 static int tps6507x_pmic_probe(struct platform_device *pdev)
425 {
426         struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
427         struct tps_info *info = &tps6507x_pmic_regs[0];
428         struct regulator_config config = { };
429         struct regulator_init_data *init_data;
430         struct regulator_dev *rdev;
431         struct tps6507x_pmic *tps;
432         struct tps6507x_board *tps_board;
433         struct of_regulator_match *tps6507x_reg_matches = NULL;
434         int i;
435         int error;
436         unsigned int prop;
437 
438         /**
439          * tps_board points to pmic related constants
440          * coming from the board-evm file.
441          */
442 
443         tps_board = dev_get_platdata(tps6507x_dev->dev);
444         if (IS_ENABLED(CONFIG_OF) && !tps_board &&
445                 tps6507x_dev->dev->of_node)
446                 tps_board = tps6507x_parse_dt_reg_data(pdev,
447                                 &tps6507x_reg_matches);
448         if (!tps_board)
449                 return -EINVAL;
450 
451         /**
452          * init_data points to array of regulator_init structures
453          * coming from the board-evm file.
454          */
455         init_data = tps_board->tps6507x_pmic_init_data;
456         if (!init_data)
457                 return -EINVAL;
458 
459         tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
460         if (!tps)
461                 return -ENOMEM;
462 
463         mutex_init(&tps->io_lock);
464 
465         /* common for all regulators */
466         tps->mfd = tps6507x_dev;
467 
468         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
469                 /* Register the regulators */
470                 tps->info[i] = info;
471                 if (init_data->driver_data) {
472                         struct tps6507x_reg_platform_data *data =
473                                         init_data->driver_data;
474                         tps->info[i]->defdcdc_default = data->defdcdc_default;
475                 }
476 
477                 tps->desc[i].name = info->name;
478                 tps->desc[i].id = i;
479                 tps->desc[i].n_voltages = info->table_len;
480                 tps->desc[i].volt_table = info->table;
481                 tps->desc[i].ops = &tps6507x_pmic_ops;
482                 tps->desc[i].type = REGULATOR_VOLTAGE;
483                 tps->desc[i].owner = THIS_MODULE;
484 
485                 config.dev = tps6507x_dev->dev;
486                 config.init_data = init_data;
487                 config.driver_data = tps;
488 
489                 if (tps6507x_reg_matches) {
490                         error = of_property_read_u32(
491                                 tps6507x_reg_matches[i].of_node,
492                                         "ti,defdcdc_default", &prop);
493 
494                         if (!error)
495                                 tps->info[i]->defdcdc_default = prop;
496 
497                         config.of_node = tps6507x_reg_matches[i].of_node;
498                 }
499 
500                 rdev = devm_regulator_register(&pdev->dev, &tps->desc[i],
501                                                &config);
502                 if (IS_ERR(rdev)) {
503                         dev_err(tps6507x_dev->dev,
504                                 "failed to register %s regulator\n",
505                                 pdev->name);
506                         return PTR_ERR(rdev);
507                 }
508 
509                 /* Save regulator for cleanup */
510                 tps->rdev[i] = rdev;
511         }
512 
513         tps6507x_dev->pmic = tps;
514         platform_set_drvdata(pdev, tps6507x_dev);
515 
516         return 0;
517 }
518 
519 static struct platform_driver tps6507x_pmic_driver = {
520         .driver = {
521                 .name = "tps6507x-pmic",
522                 .owner = THIS_MODULE,
523         },
524         .probe = tps6507x_pmic_probe,
525 };
526 
527 static int __init tps6507x_pmic_init(void)
528 {
529         return platform_driver_register(&tps6507x_pmic_driver);
530 }
531 subsys_initcall(tps6507x_pmic_init);
532 
533 static void __exit tps6507x_pmic_cleanup(void)
534 {
535         platform_driver_unregister(&tps6507x_pmic_driver);
536 }
537 module_exit(tps6507x_pmic_cleanup);
538 
539 MODULE_AUTHOR("Texas Instruments");
540 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
541 MODULE_LICENSE("GPL v2");
542 MODULE_ALIAS("platform:tps6507x-pmic");
543 

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