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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 {
298         struct tps62360_regulator_platform_data *pdata;
299         struct device_node *np = dev->of_node;
300 
301         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
302         if (!pdata) {
303                 dev_err(dev, "Memory alloc failed for platform data\n");
304                 return NULL;
305         }
306 
307         pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
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         if (client->dev.of_node) {
356                 const struct of_device_id *match;
357                 match = of_match_device(of_match_ptr(tps62360_of_match),
358                                 &client->dev);
359                 if (!match) {
360                         dev_err(&client->dev, "Error: No device match found\n");
361                         return -ENODEV;
362                 }
363                 chip_id = (int)(long)match->data;
364                 if (!pdata)
365                         pdata = of_get_tps62360_platform_data(&client->dev);
366         } else if (id) {
367                 chip_id = id->driver_data;
368         } else {
369                 dev_err(&client->dev, "No device tree match or id table match found\n");
370                 return -ENODEV;
371         }
372 
373         if (!pdata) {
374                 dev_err(&client->dev, "%s(): Platform data not found\n",
375                                                 __func__);
376                 return -EIO;
377         }
378 
379         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
380         if (!tps) {
381                 dev_err(&client->dev, "%s(): Memory allocation failed\n",
382                                                 __func__);
383                 return -ENOMEM;
384         }
385 
386         tps->en_discharge = pdata->en_discharge;
387         tps->en_internal_pulldn = pdata->en_internal_pulldn;
388         tps->vsel0_gpio = pdata->vsel0_gpio;
389         tps->vsel1_gpio = pdata->vsel1_gpio;
390         tps->dev = &client->dev;
391 
392         switch (chip_id) {
393         case TPS62360:
394         case TPS62362:
395                 tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
396                 tps->voltage_reg_mask = 0x3F;
397                 tps->desc.n_voltages = TPS62360_N_VOLTAGES;
398                 break;
399         case TPS62361:
400         case TPS62363:
401                 tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
402                 tps->voltage_reg_mask = 0x7F;
403                 tps->desc.n_voltages = TPS62361_N_VOLTAGES;
404                 break;
405         default:
406                 return -ENODEV;
407         }
408 
409         tps->desc.name = client->name;
410         tps->desc.id = 0;
411         tps->desc.ops = &tps62360_dcdc_ops;
412         tps->desc.type = REGULATOR_VOLTAGE;
413         tps->desc.owner = THIS_MODULE;
414         tps->desc.uV_step = 10000;
415 
416         tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
417         if (IS_ERR(tps->regmap)) {
418                 ret = PTR_ERR(tps->regmap);
419                 dev_err(&client->dev,
420                         "%s(): regmap allocation failed with err %d\n",
421                         __func__, ret);
422                 return ret;
423         }
424         i2c_set_clientdata(client, tps);
425 
426         tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
427                                 (pdata->vsel0_def_state & 1);
428         tps->lru_index[0] = tps->curr_vset_id;
429         tps->valid_gpios = false;
430 
431         if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
432                 int gpio_flags;
433                 gpio_flags = (pdata->vsel0_def_state) ?
434                                 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
435                 ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio,
436                                 gpio_flags, "tps62360-vsel0");
437                 if (ret) {
438                         dev_err(&client->dev,
439                                 "%s(): Could not obtain vsel0 GPIO %d: %d\n",
440                                 __func__, tps->vsel0_gpio, ret);
441                         return ret;
442                 }
443 
444                 gpio_flags = (pdata->vsel1_def_state) ?
445                                 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
446                 ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio,
447                                 gpio_flags, "tps62360-vsel1");
448                 if (ret) {
449                         dev_err(&client->dev,
450                                 "%s(): Could not obtain vsel1 GPIO %d: %d\n",
451                                 __func__, tps->vsel1_gpio, ret);
452                         return ret;
453                 }
454                 tps->valid_gpios = true;
455 
456                 /*
457                  * Initialize the lru index with vset_reg id
458                  * The index 0 will be most recently used and
459                  * set with the tps->curr_vset_id */
460                 for (i = 0; i < 4; ++i)
461                         tps->lru_index[i] = i;
462                 tps->lru_index[0] = tps->curr_vset_id;
463                 tps->lru_index[tps->curr_vset_id] = 0;
464         }
465 
466         ret = tps62360_init_dcdc(tps, pdata);
467         if (ret < 0) {
468                 dev_err(tps->dev, "%s(): Init failed with err = %d\n",
469                                 __func__, ret);
470                 return ret;
471         }
472 
473         config.dev = &client->dev;
474         config.init_data = pdata->reg_init_data;
475         config.driver_data = tps;
476         config.of_node = client->dev.of_node;
477 
478         /* Register the regulators */
479         rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
480         if (IS_ERR(rdev)) {
481                 dev_err(tps->dev,
482                         "%s(): regulator register failed with err %s\n",
483                         __func__, id->name);
484                 return PTR_ERR(rdev);
485         }
486 
487         tps->rdev = rdev;
488         return 0;
489 }
490 
491 static void tps62360_shutdown(struct i2c_client *client)
492 {
493         struct tps62360_chip *tps = i2c_get_clientdata(client);
494         int st;
495 
496         if (!tps->en_discharge)
497                 return;
498 
499         /* Configure the output discharge path */
500         st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
501         if (st < 0)
502                 dev_err(tps->dev,
503                         "%s(): register %d update failed with err %d\n",
504                         __func__, REG_RAMPCTRL, st);
505 }
506 
507 static const struct i2c_device_id tps62360_id[] = {
508         {.name = "tps62360", .driver_data = TPS62360},
509         {.name = "tps62361", .driver_data = TPS62361},
510         {.name = "tps62362", .driver_data = TPS62362},
511         {.name = "tps62363", .driver_data = TPS62363},
512         {},
513 };
514 
515 MODULE_DEVICE_TABLE(i2c, tps62360_id);
516 
517 static struct i2c_driver tps62360_i2c_driver = {
518         .driver = {
519                 .name = "tps62360",
520                 .owner = THIS_MODULE,
521                 .of_match_table = of_match_ptr(tps62360_of_match),
522         },
523         .probe = tps62360_probe,
524         .shutdown = tps62360_shutdown,
525         .id_table = tps62360_id,
526 };
527 
528 static int __init tps62360_init(void)
529 {
530         return i2c_add_driver(&tps62360_i2c_driver);
531 }
532 subsys_initcall(tps62360_init);
533 
534 static void __exit tps62360_cleanup(void)
535 {
536         i2c_del_driver(&tps62360_i2c_driver);
537 }
538 module_exit(tps62360_cleanup);
539 
540 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
541 MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
542 MODULE_LICENSE("GPL v2");
543 

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