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 };
tps6507x_pmic_read(struct tps6507x_pmic * tps,u8 reg)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
tps6507x_pmic_write(struct tps6507x_pmic * tps,u8 reg,u8 val)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
tps6507x_pmic_set_bits(struct tps6507x_pmic * tps,u8 reg,u8 mask)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
tps6507x_pmic_clear_bits(struct tps6507x_pmic * tps,u8 reg,u8 mask)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
tps6507x_pmic_reg_read(struct tps6507x_pmic * tps,u8 reg)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
tps6507x_pmic_reg_write(struct tps6507x_pmic * tps,u8 reg,u8 val)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
tps6507x_pmic_is_enabled(struct regulator_dev * dev)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
tps6507x_pmic_enable(struct regulator_dev * dev)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
tps6507x_pmic_disable(struct regulator_dev * dev)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
tps6507x_pmic_get_voltage_sel(struct regulator_dev * dev)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
tps6507x_pmic_set_voltage_sel(struct regulator_dev * dev,unsigned selector)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
tps6507x_parse_dt_reg_data(struct platform_device * pdev,struct of_regulator_match ** tps6507x_reg_matches)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 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(®_data[idx], matches[idx].init_data,
417 sizeof(struct regulator_init_data));
418
419 }
420
421 return tps_board;
422 }
423
tps6507x_pmic_probe(struct platform_device * pdev)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 },
523 .probe = tps6507x_pmic_probe,
524 };
525
tps6507x_pmic_init(void)526 static int __init tps6507x_pmic_init(void)
527 {
528 return platform_driver_register(&tps6507x_pmic_driver);
529 }
530 subsys_initcall(tps6507x_pmic_init);
531
tps6507x_pmic_cleanup(void)532 static void __exit tps6507x_pmic_cleanup(void)
533 {
534 platform_driver_unregister(&tps6507x_pmic_driver);
535 }
536 module_exit(tps6507x_pmic_cleanup);
537
538 MODULE_AUTHOR("Texas Instruments");
539 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
540 MODULE_LICENSE("GPL v2");
541 MODULE_ALIAS("platform:tps6507x-pmic");
542