Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19

Linux/drivers/regulator/tps62360-regulator.c

  1 /*
  2  * tps62360.c -- TI tps62360
  3  *
  4  * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
  5  *
  6  * Copyright (c) 2012, NVIDIA Corporation.
  7  *
  8  * Author: Laxman Dewangan <ldewangan@nvidia.com>
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public License as
 12  * published by the Free Software Foundation version 2.
 13  *
 14  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
 15  * whether express or implied; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17  * General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, write to the Free Software
 21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 22  * 02111-1307, USA
 23  */
 24 
 25 #include <linux/kernel.h>
 26 #include <linux/module.h>
 27 #include <linux/init.h>
 28 #include <linux/err.h>
 29 #include <linux/of.h>
 30 #include <linux/of_device.h>
 31 #include <linux/of_gpio.h>
 32 #include <linux/regulator/of_regulator.h>
 33 #include <linux/platform_device.h>
 34 #include <linux/regulator/driver.h>
 35 #include <linux/regulator/machine.h>
 36 #include <linux/regulator/tps62360.h>
 37 #include <linux/gpio.h>
 38 #include <linux/i2c.h>
 39 #include <linux/slab.h>
 40 #include <linux/regmap.h>
 41 
 42 /* Register definitions */
 43 #define REG_VSET0               0
 44 #define REG_VSET1               1
 45 #define REG_VSET2               2
 46 #define REG_VSET3               3
 47 #define REG_CONTROL             4
 48 #define REG_TEMP                5
 49 #define REG_RAMPCTRL            6
 50 #define REG_CHIPID              8
 51 
 52 #define FORCE_PWM_ENABLE        BIT(7)
 53 
 54 enum chips {TPS62360, TPS62361, TPS62362, TPS62363};
 55 
 56 #define TPS62360_BASE_VOLTAGE   770000
 57 #define TPS62360_N_VOLTAGES     64
 58 
 59 #define TPS62361_BASE_VOLTAGE   500000
 60 #define TPS62361_N_VOLTAGES     128
 61 
 62 /* tps 62360 chip information */
 63 struct tps62360_chip {
 64         struct device *dev;
 65         struct regulator_desc desc;
 66         struct regulator_dev *rdev;
 67         struct regmap *regmap;
 68         int vsel0_gpio;
 69         int vsel1_gpio;
 70         u8 voltage_reg_mask;
 71         bool en_internal_pulldn;
 72         bool en_discharge;
 73         bool valid_gpios;
 74         int lru_index[4];
 75         int curr_vset_vsel[4];
 76         int curr_vset_id;
 77 };
 78 
 79 /*
 80  * find_voltage_set_register: Find new voltage configuration register
 81  * (VSET) id.
 82  * The finding of the new VSET register will be based on the LRU mechanism.
 83  * Each VSET register will have different voltage configured . This
 84  * Function will look if any of the VSET register have requested voltage set
 85  * or not.
 86  *     - If it is already there then it will make that register as most
 87  *       recently used and return as found so that caller need not to set
 88  *       the VSET register but need to set the proper gpios to select this
 89  *       VSET register.
 90  *     - If requested voltage is not found then it will use the least
 91  *       recently mechanism to get new VSET register for new configuration
 92  *       and will return not_found so that caller need to set new VSET
 93  *       register and then gpios (both).
 94  */
 95 static bool find_voltage_set_register(struct tps62360_chip *tps,
 96                 int req_vsel, int *vset_reg_id)
 97 {
 98         int i;
 99         bool found = false;
100         int new_vset_reg = tps->lru_index[3];
101         int found_index = 3;
102 
103         for (i = 0; i < 4; ++i) {
104                 if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
105                         new_vset_reg = tps->lru_index[i];
106                         found_index = i;
107                         found = true;
108                         goto update_lru_index;
109                 }
110         }
111 
112 update_lru_index:
113         for (i = found_index; i > 0; i--)
114                 tps->lru_index[i] = tps->lru_index[i - 1];
115 
116         tps->lru_index[0] = new_vset_reg;
117         *vset_reg_id = new_vset_reg;
118         return found;
119 }
120 
121 static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
122 {
123         struct tps62360_chip *tps = rdev_get_drvdata(dev);
124         int vsel;
125         unsigned int data;
126         int ret;
127 
128         ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
129         if (ret < 0) {
130                 dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
131                         __func__, REG_VSET0 + tps->curr_vset_id, ret);
132                 return ret;
133         }
134         vsel = (int)data & tps->voltage_reg_mask;
135         return vsel;
136 }
137 
138 static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
139                                          unsigned selector)
140 {
141         struct tps62360_chip *tps = rdev_get_drvdata(dev);
142         int ret;
143         bool found = false;
144         int new_vset_id = tps->curr_vset_id;
145 
146         /*
147          * If gpios are available to select the VSET register then least
148          * recently used register for new configuration.
149          */
150         if (tps->valid_gpios)
151                 found = find_voltage_set_register(tps, selector, &new_vset_id);
152 
153         if (!found) {
154                 ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
155                                 tps->voltage_reg_mask, selector);
156                 if (ret < 0) {
157                         dev_err(tps->dev,
158                                 "%s(): register %d update failed with err %d\n",
159                                  __func__, REG_VSET0 + new_vset_id, ret);
160                         return ret;
161                 }
162                 tps->curr_vset_id = new_vset_id;
163                 tps->curr_vset_vsel[new_vset_id] = selector;
164         }
165 
166         /* Select proper VSET register vio gpios */
167         if (tps->valid_gpios) {
168                 gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
169                 gpio_set_value_cansleep(tps->vsel1_gpio,
170                                         (new_vset_id >> 1) & 0x1);
171         }
172         return 0;
173 }
174 
175 static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
176 {
177         struct tps62360_chip *tps = rdev_get_drvdata(rdev);
178         int i;
179         int val;
180         int ret;
181 
182         /* Enable force PWM mode in FAST mode only. */
183         switch (mode) {
184         case REGULATOR_MODE_FAST:
185                 val = FORCE_PWM_ENABLE;
186                 break;
187 
188         case REGULATOR_MODE_NORMAL:
189                 val = 0;
190                 break;
191 
192         default:
193                 return -EINVAL;
194         }
195 
196         if (!tps->valid_gpios) {
197                 ret = regmap_update_bits(tps->regmap,
198                         REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
199                 if (ret < 0)
200                         dev_err(tps->dev,
201                                 "%s(): register %d update failed with err %d\n",
202                                 __func__, REG_VSET0 + tps->curr_vset_id, ret);
203                 return ret;
204         }
205 
206         /* If gpios are valid then all register set need to be control */
207         for (i = 0; i < 4; ++i) {
208                 ret = regmap_update_bits(tps->regmap,
209                                         REG_VSET0 + i, FORCE_PWM_ENABLE, val);
210                 if (ret < 0) {
211                         dev_err(tps->dev,
212                                 "%s(): register %d update failed with err %d\n",
213                                 __func__, REG_VSET0 + i, ret);
214                         return ret;
215                 }
216         }
217         return ret;
218 }
219 
220 static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
221 {
222         struct tps62360_chip *tps = rdev_get_drvdata(rdev);
223         unsigned int data;
224         int ret;
225 
226         ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
227         if (ret < 0) {
228                 dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
229                         __func__, REG_VSET0 + tps->curr_vset_id, ret);
230                 return ret;
231         }
232         return (data & FORCE_PWM_ENABLE) ?
233                                 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
234 }
235 
236 static struct regulator_ops tps62360_dcdc_ops = {
237         .get_voltage_sel        = tps62360_dcdc_get_voltage_sel,
238         .set_voltage_sel        = tps62360_dcdc_set_voltage_sel,
239         .list_voltage           = regulator_list_voltage_linear,
240         .map_voltage            = regulator_map_voltage_linear,
241         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
242         .set_mode               = tps62360_set_mode,
243         .get_mode               = tps62360_get_mode,
244 };
245 
246 static int tps62360_init_dcdc(struct tps62360_chip *tps,
247                 struct tps62360_regulator_platform_data *pdata)
248 {
249         int ret;
250         unsigned int ramp_ctrl;
251 
252         /* Initialize internal pull up/down control */
253         if (tps->en_internal_pulldn)
254                 ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
255         else
256                 ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
257         if (ret < 0) {
258                 dev_err(tps->dev,
259                         "%s(): register %d write failed with err %d\n",
260                         __func__, REG_CONTROL, ret);
261                 return ret;
262         }
263 
264         /* Reset output discharge path to reduce power consumption */
265         ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
266         if (ret < 0) {
267                 dev_err(tps->dev,
268                         "%s(): register %d update failed with err %d\n",
269                         __func__, REG_RAMPCTRL, ret);
270                 return ret;
271         }
272 
273         /* Get ramp value from ramp control register */
274         ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
275         if (ret < 0) {
276                 dev_err(tps->dev,
277                         "%s(): register %d read failed with err %d\n",
278                         __func__, REG_RAMPCTRL, ret);
279                 return ret;
280         }
281         ramp_ctrl = (ramp_ctrl >> 5) & 0x7;
282 
283         /* ramp mV/us = 32/(2^ramp_ctrl) */
284         tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
285         return ret;
286 }
287 
288 static const struct regmap_config tps62360_regmap_config = {
289         .reg_bits               = 8,
290         .val_bits               = 8,
291         .max_register           = REG_CHIPID,
292         .cache_type             = REGCACHE_RBTREE,
293 };
294 
295 static struct tps62360_regulator_platform_data *
296         of_get_tps62360_platform_data(struct device *dev,
297                                       const struct regulator_desc *desc)
298 {
299         struct tps62360_regulator_platform_data *pdata;
300         struct device_node *np = dev->of_node;
301 
302         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
303         if (!pdata)
304                 return NULL;
305 
306         pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node,
307                                                           desc);
308         if (!pdata->reg_init_data) {
309                 dev_err(dev, "Not able to get OF regulator init data\n");
310                 return NULL;
311         }
312 
313         pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
314         pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);
315 
316         if (of_find_property(np, "ti,vsel0-state-high", NULL))
317                 pdata->vsel0_def_state = 1;
318 
319         if (of_find_property(np, "ti,vsel1-state-high", NULL))
320                 pdata->vsel1_def_state = 1;
321 
322         if (of_find_property(np, "ti,enable-pull-down", NULL))
323                 pdata->en_internal_pulldn = true;
324 
325         if (of_find_property(np, "ti,enable-vout-discharge", NULL))
326                 pdata->en_discharge = true;
327 
328         return pdata;
329 }
330 
331 #if defined(CONFIG_OF)
332 static const struct of_device_id tps62360_of_match[] = {
333          { .compatible = "ti,tps62360", .data = (void *)TPS62360},
334          { .compatible = "ti,tps62361", .data = (void *)TPS62361},
335          { .compatible = "ti,tps62362", .data = (void *)TPS62362},
336          { .compatible = "ti,tps62363", .data = (void *)TPS62363},
337         {},
338 };
339 MODULE_DEVICE_TABLE(of, tps62360_of_match);
340 #endif
341 
342 static int tps62360_probe(struct i2c_client *client,
343                                      const struct i2c_device_id *id)
344 {
345         struct regulator_config config = { };
346         struct tps62360_regulator_platform_data *pdata;
347         struct regulator_dev *rdev;
348         struct tps62360_chip *tps;
349         int ret;
350         int i;
351         int chip_id;
352 
353         pdata = dev_get_platdata(&client->dev);
354 
355         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
356         if (!tps)
357                 return -ENOMEM;
358 
359         tps->desc.name = client->name;
360         tps->desc.id = 0;
361         tps->desc.ops = &tps62360_dcdc_ops;
362         tps->desc.type = REGULATOR_VOLTAGE;
363         tps->desc.owner = THIS_MODULE;
364         tps->desc.uV_step = 10000;
365 
366         if (client->dev.of_node) {
367                 const struct of_device_id *match;
368                 match = of_match_device(of_match_ptr(tps62360_of_match),
369                                 &client->dev);
370                 if (!match) {
371                         dev_err(&client->dev, "Error: No device match found\n");
372                         return -ENODEV;
373                 }
374                 chip_id = (int)(long)match->data;
375                 if (!pdata)
376                         pdata = of_get_tps62360_platform_data(&client->dev,
377                                                               &tps->desc);
378         } else if (id) {
379                 chip_id = id->driver_data;
380         } else {
381                 dev_err(&client->dev, "No device tree match or id table match found\n");
382                 return -ENODEV;
383         }
384 
385         if (!pdata) {
386                 dev_err(&client->dev, "%s(): Platform data not found\n",
387                                                 __func__);
388                 return -EIO;
389         }
390 
391         tps->en_discharge = pdata->en_discharge;
392         tps->en_internal_pulldn = pdata->en_internal_pulldn;
393         tps->vsel0_gpio = pdata->vsel0_gpio;
394         tps->vsel1_gpio = pdata->vsel1_gpio;
395         tps->dev = &client->dev;
396 
397         switch (chip_id) {
398         case TPS62360:
399         case TPS62362:
400                 tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
401                 tps->voltage_reg_mask = 0x3F;
402                 tps->desc.n_voltages = TPS62360_N_VOLTAGES;
403                 break;
404         case TPS62361:
405         case TPS62363:
406                 tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
407                 tps->voltage_reg_mask = 0x7F;
408                 tps->desc.n_voltages = TPS62361_N_VOLTAGES;
409                 break;
410         default:
411                 return -ENODEV;
412         }
413 
414         tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
415         if (IS_ERR(tps->regmap)) {
416                 ret = PTR_ERR(tps->regmap);
417                 dev_err(&client->dev,
418                         "%s(): regmap allocation failed with err %d\n",
419                         __func__, ret);
420                 return ret;
421         }
422         i2c_set_clientdata(client, tps);
423 
424         tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
425                                 (pdata->vsel0_def_state & 1);
426         tps->lru_index[0] = tps->curr_vset_id;
427         tps->valid_gpios = false;
428 
429         if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
430                 int gpio_flags;
431                 gpio_flags = (pdata->vsel0_def_state) ?
432                                 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
433                 ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio,
434                                 gpio_flags, "tps62360-vsel0");
435                 if (ret) {
436                         dev_err(&client->dev,
437                                 "%s(): Could not obtain vsel0 GPIO %d: %d\n",
438                                 __func__, tps->vsel0_gpio, ret);
439                         return ret;
440                 }
441 
442                 gpio_flags = (pdata->vsel1_def_state) ?
443                                 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
444                 ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio,
445                                 gpio_flags, "tps62360-vsel1");
446                 if (ret) {
447                         dev_err(&client->dev,
448                                 "%s(): Could not obtain vsel1 GPIO %d: %d\n",
449                                 __func__, tps->vsel1_gpio, ret);
450                         return ret;
451                 }
452                 tps->valid_gpios = true;
453 
454                 /*
455                  * Initialize the lru index with vset_reg id
456                  * The index 0 will be most recently used and
457                  * set with the tps->curr_vset_id */
458                 for (i = 0; i < 4; ++i)
459                         tps->lru_index[i] = i;
460                 tps->lru_index[0] = tps->curr_vset_id;
461                 tps->lru_index[tps->curr_vset_id] = 0;
462         }
463 
464         ret = tps62360_init_dcdc(tps, pdata);
465         if (ret < 0) {
466                 dev_err(tps->dev, "%s(): Init failed with err = %d\n",
467                                 __func__, ret);
468                 return ret;
469         }
470 
471         config.dev = &client->dev;
472         config.init_data = pdata->reg_init_data;
473         config.driver_data = tps;
474         config.of_node = client->dev.of_node;
475 
476         /* Register the regulators */
477         rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
478         if (IS_ERR(rdev)) {
479                 dev_err(tps->dev,
480                         "%s(): regulator register failed with err %s\n",
481                         __func__, id->name);
482                 return PTR_ERR(rdev);
483         }
484 
485         tps->rdev = rdev;
486         return 0;
487 }
488 
489 static void tps62360_shutdown(struct i2c_client *client)
490 {
491         struct tps62360_chip *tps = i2c_get_clientdata(client);
492         int st;
493 
494         if (!tps->en_discharge)
495                 return;
496 
497         /* Configure the output discharge path */
498         st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
499         if (st < 0)
500                 dev_err(tps->dev,
501                         "%s(): register %d update failed with err %d\n",
502                         __func__, REG_RAMPCTRL, st);
503 }
504 
505 static const struct i2c_device_id tps62360_id[] = {
506         {.name = "tps62360", .driver_data = TPS62360},
507         {.name = "tps62361", .driver_data = TPS62361},
508         {.name = "tps62362", .driver_data = TPS62362},
509         {.name = "tps62363", .driver_data = TPS62363},
510         {},
511 };
512 
513 MODULE_DEVICE_TABLE(i2c, tps62360_id);
514 
515 static struct i2c_driver tps62360_i2c_driver = {
516         .driver = {
517                 .name = "tps62360",
518                 .owner = THIS_MODULE,
519                 .of_match_table = of_match_ptr(tps62360_of_match),
520         },
521         .probe = tps62360_probe,
522         .shutdown = tps62360_shutdown,
523         .id_table = tps62360_id,
524 };
525 
526 static int __init tps62360_init(void)
527 {
528         return i2c_add_driver(&tps62360_i2c_driver);
529 }
530 subsys_initcall(tps62360_init);
531 
532 static void __exit tps62360_cleanup(void)
533 {
534         i2c_del_driver(&tps62360_i2c_driver);
535 }
536 module_exit(tps62360_cleanup);
537 
538 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
539 MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
540 MODULE_LICENSE("GPL v2");
541 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us