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