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"); 533