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Linux/drivers/regulator/tps65912-regulator.c

  1 /*
  2  * tps65912.c  --  TI tps65912
  3  *
  4  * Copyright 2011 Texas Instruments Inc.
  5  *
  6  * Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
  7  *
  8  *  This program is free software; you can redistribute it and/or modify it
  9  *  under  the terms of the GNU General  Public License as published by the
 10  *  Free Software Foundation;  either version 2 of the License, or (at your
 11  *  option) any later version.
 12  *
 13  * This driver is based on wm8350 implementation.
 14  */
 15 
 16 #include <linux/kernel.h>
 17 #include <linux/module.h>
 18 #include <linux/init.h>
 19 #include <linux/err.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/regulator/driver.h>
 22 #include <linux/regulator/machine.h>
 23 #include <linux/slab.h>
 24 #include <linux/gpio.h>
 25 #include <linux/mfd/tps65912.h>
 26 
 27 /* DCDC's */
 28 #define TPS65912_REG_DCDC1      0
 29 #define TPS65912_REG_DCDC2      1
 30 #define TPS65912_REG_DCDC3      2
 31 #define TPS65912_REG_DCDC4      3
 32 
 33 /* LDOs */
 34 #define TPS65912_REG_LDO1       4
 35 #define TPS65912_REG_LDO2       5
 36 #define TPS65912_REG_LDO3       6
 37 #define TPS65912_REG_LDO4       7
 38 #define TPS65912_REG_LDO5       8
 39 #define TPS65912_REG_LDO6       9
 40 #define TPS65912_REG_LDO7       10
 41 #define TPS65912_REG_LDO8       11
 42 #define TPS65912_REG_LDO9       12
 43 #define TPS65912_REG_LDO10      13
 44 
 45 /* Number of step-down converters available */
 46 #define TPS65912_NUM_DCDC       4
 47 
 48 /* Number of LDO voltage regulators  available */
 49 #define TPS65912_NUM_LDO        10
 50 
 51 /* Number of total regulators available */
 52 #define TPS65912_NUM_REGULATOR          (TPS65912_NUM_DCDC + TPS65912_NUM_LDO)
 53 
 54 #define TPS65912_REG_ENABLED    0x80
 55 #define OP_SELREG_MASK          0x40
 56 #define OP_SELREG_SHIFT         6
 57 
 58 struct tps_info {
 59         const char *name;
 60 };
 61 
 62 static struct tps_info tps65912_regs[] = {
 63         {
 64                 .name = "DCDC1",
 65         },
 66         {
 67                 .name = "DCDC2",
 68         },
 69         {
 70                 .name = "DCDC3",
 71         },
 72         {
 73                 .name = "DCDC4",
 74         },
 75         {
 76                 .name = "LDO1",
 77         },
 78         {
 79                 .name = "LDO2",
 80         },
 81         {
 82                 .name = "LDO3",
 83         },
 84         {
 85                 .name = "LDO4",
 86         },
 87         {
 88                 .name = "LDO5",
 89         },
 90         {
 91                 .name = "LDO6",
 92         },
 93         {
 94                 .name = "LDO7",
 95         },
 96         {
 97                 .name = "LDO8",
 98         },
 99         {
100                 .name = "LDO9",
101         },
102         {
103                 .name = "LDO10",
104         },
105 };
106 
107 struct tps65912_reg {
108         struct regulator_desc desc[TPS65912_NUM_REGULATOR];
109         struct tps65912 *mfd;
110         struct regulator_dev *rdev[TPS65912_NUM_REGULATOR];
111         struct tps_info *info[TPS65912_NUM_REGULATOR];
112         /* for read/write access */
113         struct mutex io_lock;
114         int mode;
115         int (*get_ctrl_reg)(int);
116         int dcdc_range[TPS65912_NUM_DCDC];
117         int pwm_mode_reg;
118         int eco_reg;
119 };
120 
121 static const struct regulator_linear_range tps65912_ldo_ranges[] = {
122         REGULATOR_LINEAR_RANGE(800000, 0, 32, 25000),
123         REGULATOR_LINEAR_RANGE(1650000, 33, 60, 50000),
124         REGULATOR_LINEAR_RANGE(3100000, 61, 63, 100000),
125 };
126 
127 static int tps65912_get_range(struct tps65912_reg *pmic, int id)
128 {
129         struct tps65912 *mfd = pmic->mfd;
130         int range;
131 
132         switch (id) {
133         case TPS65912_REG_DCDC1:
134                 range = tps65912_reg_read(mfd, TPS65912_DCDC1_LIMIT);
135                 break;
136         case TPS65912_REG_DCDC2:
137                 range = tps65912_reg_read(mfd, TPS65912_DCDC2_LIMIT);
138                 break;
139         case TPS65912_REG_DCDC3:
140                 range = tps65912_reg_read(mfd, TPS65912_DCDC3_LIMIT);
141                 break;
142         case TPS65912_REG_DCDC4:
143                 range = tps65912_reg_read(mfd, TPS65912_DCDC4_LIMIT);
144                 break;
145         default:
146                 return 0;
147         }
148 
149         if (range >= 0)
150                 range = (range & DCDC_LIMIT_RANGE_MASK)
151                         >> DCDC_LIMIT_RANGE_SHIFT;
152 
153         pmic->dcdc_range[id] = range;
154         return range;
155 }
156 
157 static unsigned long tps65912_vsel_to_uv_range0(u8 vsel)
158 {
159         unsigned long uv;
160 
161         uv = ((vsel * 12500) + 500000);
162         return uv;
163 }
164 
165 static unsigned long tps65912_vsel_to_uv_range1(u8 vsel)
166 {
167         unsigned long uv;
168 
169          uv = ((vsel * 12500) + 700000);
170         return uv;
171 }
172 
173 static unsigned long tps65912_vsel_to_uv_range2(u8 vsel)
174 {
175         unsigned long uv;
176 
177         uv = ((vsel * 25000) + 500000);
178         return uv;
179 }
180 
181 static unsigned long tps65912_vsel_to_uv_range3(u8 vsel)
182 {
183         unsigned long uv;
184 
185         if (vsel == 0x3f)
186                 uv = 3800000;
187         else
188                 uv = ((vsel * 50000) + 500000);
189 
190         return uv;
191 }
192 
193 static int tps65912_get_ctrl_register(int id)
194 {
195         if (id >= TPS65912_REG_DCDC1 && id <= TPS65912_REG_LDO4)
196                 return id * 3 + TPS65912_DCDC1_AVS;
197         else if (id >= TPS65912_REG_LDO5 && id <= TPS65912_REG_LDO10)
198                 return id - TPS65912_REG_LDO5 + TPS65912_LDO5;
199         else
200                 return -EINVAL;
201 }
202 
203 static int tps65912_get_sel_register(struct tps65912_reg *pmic, int id)
204 {
205         struct tps65912 *mfd = pmic->mfd;
206         int opvsel;
207         u8 reg = 0;
208 
209         if (id >= TPS65912_REG_DCDC1 && id <= TPS65912_REG_LDO4) {
210                 opvsel = tps65912_reg_read(mfd, id * 3 + TPS65912_DCDC1_OP);
211                 if (opvsel & OP_SELREG_MASK)
212                         reg = id * 3 + TPS65912_DCDC1_AVS;
213                 else
214                         reg = id * 3 + TPS65912_DCDC1_OP;
215         } else if (id >= TPS65912_REG_LDO5 && id <= TPS65912_REG_LDO10) {
216                 reg = id - TPS65912_REG_LDO5 + TPS65912_LDO5;
217         } else {
218                 return -EINVAL;
219         }
220 
221         return reg;
222 }
223 
224 static int tps65912_get_mode_regiters(struct tps65912_reg *pmic, int id)
225 {
226         switch (id) {
227         case TPS65912_REG_DCDC1:
228                 pmic->pwm_mode_reg = TPS65912_DCDC1_CTRL;
229                 pmic->eco_reg = TPS65912_DCDC1_AVS;
230                 break;
231         case TPS65912_REG_DCDC2:
232                 pmic->pwm_mode_reg = TPS65912_DCDC2_CTRL;
233                 pmic->eco_reg = TPS65912_DCDC2_AVS;
234                 break;
235         case TPS65912_REG_DCDC3:
236                 pmic->pwm_mode_reg = TPS65912_DCDC3_CTRL;
237                 pmic->eco_reg = TPS65912_DCDC3_AVS;
238                 break;
239         case TPS65912_REG_DCDC4:
240                 pmic->pwm_mode_reg = TPS65912_DCDC4_CTRL;
241                 pmic->eco_reg = TPS65912_DCDC4_AVS;
242                 break;
243         default:
244                 return -EINVAL;
245         }
246 
247         return 0;
248 }
249 
250 static int tps65912_reg_is_enabled(struct regulator_dev *dev)
251 {
252         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
253         struct tps65912 *mfd = pmic->mfd;
254         int reg, value, id = rdev_get_id(dev);
255 
256         if (id < TPS65912_REG_DCDC1 || id > TPS65912_REG_LDO10)
257                 return -EINVAL;
258 
259         reg = pmic->get_ctrl_reg(id);
260         if (reg < 0)
261                 return reg;
262 
263         value = tps65912_reg_read(mfd, reg);
264         if (value < 0)
265                 return value;
266 
267         return value & TPS65912_REG_ENABLED;
268 }
269 
270 static int tps65912_reg_enable(struct regulator_dev *dev)
271 {
272         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
273         struct tps65912 *mfd = pmic->mfd;
274         int id = rdev_get_id(dev);
275         int reg;
276 
277         if (id < TPS65912_REG_DCDC1 || id > TPS65912_REG_LDO10)
278                 return -EINVAL;
279 
280         reg = pmic->get_ctrl_reg(id);
281         if (reg < 0)
282                 return reg;
283 
284         return tps65912_set_bits(mfd, reg, TPS65912_REG_ENABLED);
285 }
286 
287 static int tps65912_reg_disable(struct regulator_dev *dev)
288 {
289         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
290         struct tps65912 *mfd = pmic->mfd;
291         int id = rdev_get_id(dev), reg;
292 
293         reg = pmic->get_ctrl_reg(id);
294         if (reg < 0)
295                 return reg;
296 
297         return tps65912_clear_bits(mfd, reg, TPS65912_REG_ENABLED);
298 }
299 
300 static int tps65912_set_mode(struct regulator_dev *dev, unsigned int mode)
301 {
302         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
303         struct tps65912 *mfd = pmic->mfd;
304         int pwm_mode, eco, id = rdev_get_id(dev);
305 
306         tps65912_get_mode_regiters(pmic, id);
307 
308         pwm_mode = tps65912_reg_read(mfd, pmic->pwm_mode_reg);
309         eco = tps65912_reg_read(mfd, pmic->eco_reg);
310 
311         pwm_mode &= DCDCCTRL_DCDC_MODE_MASK;
312         eco &= DCDC_AVS_ECO_MASK;
313 
314         switch (mode) {
315         case REGULATOR_MODE_FAST:
316                 /* Verify if mode alredy set */
317                 if (pwm_mode && !eco)
318                         break;
319                 tps65912_set_bits(mfd, pmic->pwm_mode_reg, DCDCCTRL_DCDC_MODE_MASK);
320                 tps65912_clear_bits(mfd, pmic->eco_reg, DCDC_AVS_ECO_MASK);
321                 break;
322         case REGULATOR_MODE_NORMAL:
323         case REGULATOR_MODE_IDLE:
324                 if (!pwm_mode && !eco)
325                         break;
326                 tps65912_clear_bits(mfd, pmic->pwm_mode_reg, DCDCCTRL_DCDC_MODE_MASK);
327                 tps65912_clear_bits(mfd, pmic->eco_reg, DCDC_AVS_ECO_MASK);
328                 break;
329         case REGULATOR_MODE_STANDBY:
330                 if (!pwm_mode && eco)
331                         break;
332                 tps65912_clear_bits(mfd, pmic->pwm_mode_reg, DCDCCTRL_DCDC_MODE_MASK);
333                 tps65912_set_bits(mfd, pmic->eco_reg, DCDC_AVS_ECO_MASK);
334                 break;
335         default:
336                 return -EINVAL;
337         }
338 
339         return 0;
340 }
341 
342 static unsigned int tps65912_get_mode(struct regulator_dev *dev)
343 {
344         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
345         struct tps65912 *mfd = pmic->mfd;
346         int pwm_mode, eco, mode = 0, id = rdev_get_id(dev);
347 
348         tps65912_get_mode_regiters(pmic, id);
349 
350         pwm_mode = tps65912_reg_read(mfd, pmic->pwm_mode_reg);
351         eco = tps65912_reg_read(mfd, pmic->eco_reg);
352 
353         pwm_mode &= DCDCCTRL_DCDC_MODE_MASK;
354         eco &= DCDC_AVS_ECO_MASK;
355 
356         if (pwm_mode && !eco)
357                 mode = REGULATOR_MODE_FAST;
358         else if (!pwm_mode && !eco)
359                 mode = REGULATOR_MODE_NORMAL;
360         else if (!pwm_mode && eco)
361                 mode = REGULATOR_MODE_STANDBY;
362 
363         return mode;
364 }
365 
366 static int tps65912_list_voltage(struct regulator_dev *dev, unsigned selector)
367 {
368         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
369         int range, voltage = 0, id = rdev_get_id(dev);
370 
371         if (id > TPS65912_REG_DCDC4)
372                 return -EINVAL;
373 
374         range = pmic->dcdc_range[id];
375 
376         switch (range) {
377         case 0:
378                 /* 0.5 - 1.2875V in 12.5mV steps */
379                 voltage = tps65912_vsel_to_uv_range0(selector);
380                 break;
381         case 1:
382                 /* 0.7 - 1.4875V in 12.5mV steps */
383                 voltage = tps65912_vsel_to_uv_range1(selector);
384                 break;
385         case 2:
386                 /* 0.5 - 2.075V in 25mV steps */
387                 voltage = tps65912_vsel_to_uv_range2(selector);
388                 break;
389         case 3:
390                 /* 0.5 - 3.8V in 50mV steps */
391                 voltage = tps65912_vsel_to_uv_range3(selector);
392                 break;
393         }
394         return voltage;
395 }
396 
397 static int tps65912_get_voltage_sel(struct regulator_dev *dev)
398 {
399         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
400         struct tps65912 *mfd = pmic->mfd;
401         int id = rdev_get_id(dev);
402         int reg, vsel;
403 
404         reg = tps65912_get_sel_register(pmic, id);
405         if (reg < 0)
406                 return reg;
407 
408         vsel = tps65912_reg_read(mfd, reg);
409         vsel &= 0x3F;
410 
411         return vsel;
412 }
413 
414 static int tps65912_set_voltage_sel(struct regulator_dev *dev,
415                                          unsigned selector)
416 {
417         struct tps65912_reg *pmic = rdev_get_drvdata(dev);
418         struct tps65912 *mfd = pmic->mfd;
419         int id = rdev_get_id(dev);
420         int value;
421         u8 reg;
422 
423         reg = tps65912_get_sel_register(pmic, id);
424         value = tps65912_reg_read(mfd, reg);
425         value &= 0xC0;
426         return tps65912_reg_write(mfd, reg, selector | value);
427 }
428 
429 /* Operations permitted on DCDCx */
430 static struct regulator_ops tps65912_ops_dcdc = {
431         .is_enabled = tps65912_reg_is_enabled,
432         .enable = tps65912_reg_enable,
433         .disable = tps65912_reg_disable,
434         .set_mode = tps65912_set_mode,
435         .get_mode = tps65912_get_mode,
436         .get_voltage_sel = tps65912_get_voltage_sel,
437         .set_voltage_sel = tps65912_set_voltage_sel,
438         .list_voltage = tps65912_list_voltage,
439 };
440 
441 /* Operations permitted on LDOx */
442 static struct regulator_ops tps65912_ops_ldo = {
443         .is_enabled = tps65912_reg_is_enabled,
444         .enable = tps65912_reg_enable,
445         .disable = tps65912_reg_disable,
446         .get_voltage_sel = tps65912_get_voltage_sel,
447         .set_voltage_sel = tps65912_set_voltage_sel,
448         .list_voltage = regulator_list_voltage_linear_range,
449         .map_voltage = regulator_map_voltage_linear_range,
450 };
451 
452 static int tps65912_probe(struct platform_device *pdev)
453 {
454         struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
455         struct regulator_config config = { };
456         struct tps_info *info;
457         struct regulator_init_data *reg_data;
458         struct regulator_dev *rdev;
459         struct tps65912_reg *pmic;
460         struct tps65912_board *pmic_plat_data;
461         int i;
462 
463         pmic_plat_data = dev_get_platdata(tps65912->dev);
464         if (!pmic_plat_data)
465                 return -EINVAL;
466 
467         reg_data = pmic_plat_data->tps65912_pmic_init_data;
468 
469         pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
470         if (!pmic)
471                 return -ENOMEM;
472 
473         mutex_init(&pmic->io_lock);
474         pmic->mfd = tps65912;
475         platform_set_drvdata(pdev, pmic);
476 
477         pmic->get_ctrl_reg = &tps65912_get_ctrl_register;
478         info = tps65912_regs;
479 
480         for (i = 0; i < TPS65912_NUM_REGULATOR; i++, info++, reg_data++) {
481                 int range = 0;
482                 /* Register the regulators */
483                 pmic->info[i] = info;
484 
485                 pmic->desc[i].name = info->name;
486                 pmic->desc[i].id = i;
487                 pmic->desc[i].n_voltages = 64;
488                 if (i > TPS65912_REG_DCDC4) {
489                         pmic->desc[i].ops = &tps65912_ops_ldo;
490                         pmic->desc[i].linear_ranges = tps65912_ldo_ranges;
491                         pmic->desc[i].n_linear_ranges =
492                                         ARRAY_SIZE(tps65912_ldo_ranges);
493                 } else {
494                         pmic->desc[i].ops = &tps65912_ops_dcdc;
495                 }
496                 pmic->desc[i].type = REGULATOR_VOLTAGE;
497                 pmic->desc[i].owner = THIS_MODULE;
498                 range = tps65912_get_range(pmic, i);
499 
500                 config.dev = tps65912->dev;
501                 config.init_data = reg_data;
502                 config.driver_data = pmic;
503 
504                 rdev = devm_regulator_register(&pdev->dev, &pmic->desc[i],
505                                                &config);
506                 if (IS_ERR(rdev)) {
507                         dev_err(tps65912->dev,
508                                 "failed to register %s regulator\n",
509                                 pdev->name);
510                         return PTR_ERR(rdev);
511                 }
512 
513                 /* Save regulator for cleanup */
514                 pmic->rdev[i] = rdev;
515         }
516         return 0;
517 }
518 
519 static struct platform_driver tps65912_driver = {
520         .driver = {
521                 .name = "tps65912-pmic",
522                 .owner = THIS_MODULE,
523         },
524         .probe = tps65912_probe,
525 };
526 
527 static int __init tps65912_init(void)
528 {
529         return platform_driver_register(&tps65912_driver);
530 }
531 subsys_initcall(tps65912_init);
532 
533 static void __exit tps65912_cleanup(void)
534 {
535         platform_driver_unregister(&tps65912_driver);
536 }
537 module_exit(tps65912_cleanup);
538 
539 MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
540 MODULE_DESCRIPTION("TPS65912 voltage regulator driver");
541 MODULE_LICENSE("GPL v2");
542 MODULE_ALIAS("platform:tps65912-pmic");
543 

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