1 /*
2 * tps6507x-regulator.c
3 *
4 * Regulator driver for TPS65073 PMIC
5 *
6 * Copyright (C) 2009 Texas Instrument Incorporated - https://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 tps_info *info[TPS6507X_NUM_REGULATOR];
119 struct mutex io_lock;
120 };
tps6507x_pmic_read(struct tps6507x_pmic * tps,u8 reg)121 static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
122 {
123 u8 val;
124 int err;
125
126 err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
127
128 if (err)
129 return err;
130
131 return val;
132 }
133
tps6507x_pmic_write(struct tps6507x_pmic * tps,u8 reg,u8 val)134 static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
135 {
136 return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
137 }
138
tps6507x_pmic_set_bits(struct tps6507x_pmic * tps,u8 reg,u8 mask)139 static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
140 {
141 int err, data;
142
143 mutex_lock(&tps->io_lock);
144
145 data = tps6507x_pmic_read(tps, reg);
146 if (data < 0) {
147 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
148 err = data;
149 goto out;
150 }
151
152 data |= mask;
153 err = tps6507x_pmic_write(tps, reg, data);
154 if (err)
155 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
156
157 out:
158 mutex_unlock(&tps->io_lock);
159 return err;
160 }
161
tps6507x_pmic_clear_bits(struct tps6507x_pmic * tps,u8 reg,u8 mask)162 static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
163 {
164 int err, data;
165
166 mutex_lock(&tps->io_lock);
167
168 data = tps6507x_pmic_read(tps, reg);
169 if (data < 0) {
170 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
171 err = data;
172 goto out;
173 }
174
175 data &= ~mask;
176 err = tps6507x_pmic_write(tps, reg, data);
177 if (err)
178 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
179
180 out:
181 mutex_unlock(&tps->io_lock);
182 return err;
183 }
184
tps6507x_pmic_reg_read(struct tps6507x_pmic * tps,u8 reg)185 static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
186 {
187 int data;
188
189 mutex_lock(&tps->io_lock);
190
191 data = tps6507x_pmic_read(tps, reg);
192 if (data < 0)
193 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
194
195 mutex_unlock(&tps->io_lock);
196 return data;
197 }
198
tps6507x_pmic_reg_write(struct tps6507x_pmic * tps,u8 reg,u8 val)199 static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
200 {
201 int err;
202
203 mutex_lock(&tps->io_lock);
204
205 err = tps6507x_pmic_write(tps, reg, val);
206 if (err < 0)
207 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
208
209 mutex_unlock(&tps->io_lock);
210 return err;
211 }
212
tps6507x_pmic_is_enabled(struct regulator_dev * dev)213 static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
214 {
215 struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
216 int data, rid = rdev_get_id(dev);
217 u8 shift;
218
219 if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
220 return -EINVAL;
221
222 shift = TPS6507X_MAX_REG_ID - rid;
223 data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
224
225 if (data < 0)
226 return data;
227 else
228 return (data & 1<<shift) ? 1 : 0;
229 }
230
tps6507x_pmic_enable(struct regulator_dev * dev)231 static int tps6507x_pmic_enable(struct regulator_dev *dev)
232 {
233 struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
234 int rid = rdev_get_id(dev);
235 u8 shift;
236
237 if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
238 return -EINVAL;
239
240 shift = TPS6507X_MAX_REG_ID - rid;
241 return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
242 }
243
tps6507x_pmic_disable(struct regulator_dev * dev)244 static int tps6507x_pmic_disable(struct regulator_dev *dev)
245 {
246 struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
247 int rid = rdev_get_id(dev);
248 u8 shift;
249
250 if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
251 return -EINVAL;
252
253 shift = TPS6507X_MAX_REG_ID - rid;
254 return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
255 1 << shift);
256 }
257
tps6507x_pmic_get_voltage_sel(struct regulator_dev * dev)258 static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
259 {
260 struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
261 int data, rid = rdev_get_id(dev);
262 u8 reg, mask;
263
264 switch (rid) {
265 case TPS6507X_DCDC_1:
266 reg = TPS6507X_REG_DEFDCDC1;
267 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
268 break;
269 case TPS6507X_DCDC_2:
270 if (tps->info[rid]->defdcdc_default)
271 reg = TPS6507X_REG_DEFDCDC2_HIGH;
272 else
273 reg = TPS6507X_REG_DEFDCDC2_LOW;
274 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
275 break;
276 case TPS6507X_DCDC_3:
277 if (tps->info[rid]->defdcdc_default)
278 reg = TPS6507X_REG_DEFDCDC3_HIGH;
279 else
280 reg = TPS6507X_REG_DEFDCDC3_LOW;
281 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
282 break;
283 case TPS6507X_LDO_1:
284 reg = TPS6507X_REG_LDO_CTRL1;
285 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
286 break;
287 case TPS6507X_LDO_2:
288 reg = TPS6507X_REG_DEFLDO2;
289 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
290 break;
291 default:
292 return -EINVAL;
293 }
294
295 data = tps6507x_pmic_reg_read(tps, reg);
296 if (data < 0)
297 return data;
298
299 data &= mask;
300 return data;
301 }
302
tps6507x_pmic_set_voltage_sel(struct regulator_dev * dev,unsigned selector)303 static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
304 unsigned selector)
305 {
306 struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
307 int data, rid = rdev_get_id(dev);
308 u8 reg, mask;
309
310 switch (rid) {
311 case TPS6507X_DCDC_1:
312 reg = TPS6507X_REG_DEFDCDC1;
313 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
314 break;
315 case TPS6507X_DCDC_2:
316 if (tps->info[rid]->defdcdc_default)
317 reg = TPS6507X_REG_DEFDCDC2_HIGH;
318 else
319 reg = TPS6507X_REG_DEFDCDC2_LOW;
320 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
321 break;
322 case TPS6507X_DCDC_3:
323 if (tps->info[rid]->defdcdc_default)
324 reg = TPS6507X_REG_DEFDCDC3_HIGH;
325 else
326 reg = TPS6507X_REG_DEFDCDC3_LOW;
327 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
328 break;
329 case TPS6507X_LDO_1:
330 reg = TPS6507X_REG_LDO_CTRL1;
331 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
332 break;
333 case TPS6507X_LDO_2:
334 reg = TPS6507X_REG_DEFLDO2;
335 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
336 break;
337 default:
338 return -EINVAL;
339 }
340
341 data = tps6507x_pmic_reg_read(tps, reg);
342 if (data < 0)
343 return data;
344
345 data &= ~mask;
346 data |= selector;
347
348 return tps6507x_pmic_reg_write(tps, reg, data);
349 }
350
351 static const struct regulator_ops tps6507x_pmic_ops = {
352 .is_enabled = tps6507x_pmic_is_enabled,
353 .enable = tps6507x_pmic_enable,
354 .disable = tps6507x_pmic_disable,
355 .get_voltage_sel = tps6507x_pmic_get_voltage_sel,
356 .set_voltage_sel = tps6507x_pmic_set_voltage_sel,
357 .list_voltage = regulator_list_voltage_table,
358 .map_voltage = regulator_map_voltage_ascend,
359 };
360
tps6507x_pmic_of_parse_cb(struct device_node * np,const struct regulator_desc * desc,struct regulator_config * config)361 static int tps6507x_pmic_of_parse_cb(struct device_node *np,
362 const struct regulator_desc *desc,
363 struct regulator_config *config)
364 {
365 struct tps6507x_pmic *tps = config->driver_data;
366 struct tps_info *info = tps->info[desc->id];
367 u32 prop;
368 int ret;
369
370 ret = of_property_read_u32(np, "ti,defdcdc_default", &prop);
371 if (!ret)
372 info->defdcdc_default = prop;
373
374 return 0;
375 }
376
tps6507x_pmic_probe(struct platform_device * pdev)377 static int tps6507x_pmic_probe(struct platform_device *pdev)
378 {
379 struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
380 struct tps_info *info = &tps6507x_pmic_regs[0];
381 struct regulator_config config = { };
382 struct regulator_init_data *init_data = NULL;
383 struct regulator_dev *rdev;
384 struct tps6507x_pmic *tps;
385 struct tps6507x_board *tps_board;
386 int i;
387
388 /**
389 * tps_board points to pmic related constants
390 * coming from the board-evm file.
391 */
392
393 tps_board = dev_get_platdata(tps6507x_dev->dev);
394 if (tps_board)
395 init_data = tps_board->tps6507x_pmic_init_data;
396
397 tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
398 if (!tps)
399 return -ENOMEM;
400
401 mutex_init(&tps->io_lock);
402
403 /* common for all regulators */
404 tps->mfd = tps6507x_dev;
405
406 for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++) {
407 /* Register the regulators */
408 tps->info[i] = info;
409 if (init_data && init_data[i].driver_data) {
410 struct tps6507x_reg_platform_data *data =
411 init_data[i].driver_data;
412 info->defdcdc_default = data->defdcdc_default;
413 }
414
415 tps->desc[i].name = info->name;
416 tps->desc[i].of_match = of_match_ptr(info->name);
417 tps->desc[i].regulators_node = of_match_ptr("regulators");
418 tps->desc[i].of_parse_cb = tps6507x_pmic_of_parse_cb;
419 tps->desc[i].id = i;
420 tps->desc[i].n_voltages = info->table_len;
421 tps->desc[i].volt_table = info->table;
422 tps->desc[i].ops = &tps6507x_pmic_ops;
423 tps->desc[i].type = REGULATOR_VOLTAGE;
424 tps->desc[i].owner = THIS_MODULE;
425
426 config.dev = tps6507x_dev->dev;
427 config.init_data = init_data;
428 config.driver_data = tps;
429
430 rdev = devm_regulator_register(&pdev->dev, &tps->desc[i],
431 &config);
432 if (IS_ERR(rdev)) {
433 dev_err(tps6507x_dev->dev,
434 "failed to register %s regulator\n",
435 pdev->name);
436 return PTR_ERR(rdev);
437 }
438 }
439
440 tps6507x_dev->pmic = tps;
441 platform_set_drvdata(pdev, tps6507x_dev);
442
443 return 0;
444 }
445
446 static struct platform_driver tps6507x_pmic_driver = {
447 .driver = {
448 .name = "tps6507x-pmic",
449 },
450 .probe = tps6507x_pmic_probe,
451 };
452
tps6507x_pmic_init(void)453 static int __init tps6507x_pmic_init(void)
454 {
455 return platform_driver_register(&tps6507x_pmic_driver);
456 }
457 subsys_initcall(tps6507x_pmic_init);
458
tps6507x_pmic_cleanup(void)459 static void __exit tps6507x_pmic_cleanup(void)
460 {
461 platform_driver_unregister(&tps6507x_pmic_driver);
462 }
463 module_exit(tps6507x_pmic_cleanup);
464
465 MODULE_AUTHOR("Texas Instruments");
466 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
467 MODULE_LICENSE("GPL v2");
468 MODULE_ALIAS("platform:tps6507x-pmic");
469