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 >> 4) & 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 = client->dev.platform_data; 354 chip_id = id->driver_data; 355 356 if (client->dev.of_node) { 357 const struct of_device_id *match; 358 match = of_match_device(of_match_ptr(tps62360_of_match), 359 &client->dev); 360 if (!match) { 361 dev_err(&client->dev, "Error: No device match found\n"); 362 return -ENODEV; 363 } 364 chip_id = (int)match->data; 365 if (!pdata) 366 pdata = of_get_tps62360_platform_data(&client->dev); 367 } 368 369 if (!pdata) { 370 dev_err(&client->dev, "%s(): Platform data not found\n", 371 __func__); 372 return -EIO; 373 } 374 375 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); 376 if (!tps) { 377 dev_err(&client->dev, "%s(): Memory allocation failed\n", 378 __func__); 379 return -ENOMEM; 380 } 381 382 tps->en_discharge = pdata->en_discharge; 383 tps->en_internal_pulldn = pdata->en_internal_pulldn; 384 tps->vsel0_gpio = pdata->vsel0_gpio; 385 tps->vsel1_gpio = pdata->vsel1_gpio; 386 tps->dev = &client->dev; 387 388 switch (chip_id) { 389 case TPS62360: 390 case TPS62362: 391 tps->desc.min_uV = TPS62360_BASE_VOLTAGE; 392 tps->voltage_reg_mask = 0x3F; 393 tps->desc.n_voltages = TPS62360_N_VOLTAGES; 394 break; 395 case TPS62361: 396 case TPS62363: 397 tps->desc.min_uV = TPS62361_BASE_VOLTAGE; 398 tps->voltage_reg_mask = 0x7F; 399 tps->desc.n_voltages = TPS62361_N_VOLTAGES; 400 break; 401 default: 402 return -ENODEV; 403 } 404 405 tps->desc.name = id->name; 406 tps->desc.id = 0; 407 tps->desc.ops = &tps62360_dcdc_ops; 408 tps->desc.type = REGULATOR_VOLTAGE; 409 tps->desc.owner = THIS_MODULE; 410 tps->desc.uV_step = 10000; 411 412 tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config); 413 if (IS_ERR(tps->regmap)) { 414 ret = PTR_ERR(tps->regmap); 415 dev_err(&client->dev, 416 "%s(): regmap allocation failed with err %d\n", 417 __func__, ret); 418 return ret; 419 } 420 i2c_set_clientdata(client, tps); 421 422 tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 + 423 (pdata->vsel0_def_state & 1); 424 tps->lru_index[0] = tps->curr_vset_id; 425 tps->valid_gpios = false; 426 427 if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) { 428 int gpio_flags; 429 gpio_flags = (pdata->vsel0_def_state) ? 430 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; 431 ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio, 432 gpio_flags, "tps62360-vsel0"); 433 if (ret) { 434 dev_err(&client->dev, 435 "%s(): Could not obtain vsel0 GPIO %d: %d\n", 436 __func__, tps->vsel0_gpio, ret); 437 return ret; 438 } 439 440 gpio_flags = (pdata->vsel1_def_state) ? 441 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; 442 ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio, 443 gpio_flags, "tps62360-vsel1"); 444 if (ret) { 445 dev_err(&client->dev, 446 "%s(): Could not obtain vsel1 GPIO %d: %d\n", 447 __func__, tps->vsel1_gpio, ret); 448 return ret; 449 } 450 tps->valid_gpios = true; 451 452 /* 453 * Initialize the lru index with vset_reg id 454 * The index 0 will be most recently used and 455 * set with the tps->curr_vset_id */ 456 for (i = 0; i < 4; ++i) 457 tps->lru_index[i] = i; 458 tps->lru_index[0] = tps->curr_vset_id; 459 tps->lru_index[tps->curr_vset_id] = 0; 460 } 461 462 ret = tps62360_init_dcdc(tps, pdata); 463 if (ret < 0) { 464 dev_err(tps->dev, "%s(): Init failed with err = %d\n", 465 __func__, ret); 466 return ret; 467 } 468 469 config.dev = &client->dev; 470 config.init_data = pdata->reg_init_data; 471 config.driver_data = tps; 472 config.of_node = client->dev.of_node; 473 474 /* Register the regulators */ 475 rdev = regulator_register(&tps->desc, &config); 476 if (IS_ERR(rdev)) { 477 dev_err(tps->dev, 478 "%s(): regulator register failed with err %s\n", 479 __func__, id->name); 480 return PTR_ERR(rdev); 481 } 482 483 tps->rdev = rdev; 484 return 0; 485 } 486 487 /** 488 * tps62360_remove - tps62360 driver i2c remove handler 489 * @client: i2c driver client device structure 490 * 491 * Unregister TPS driver as an i2c client device driver 492 */ 493 static int tps62360_remove(struct i2c_client *client) 494 { 495 struct tps62360_chip *tps = i2c_get_clientdata(client); 496 497 regulator_unregister(tps->rdev); 498 return 0; 499 } 500 501 static void tps62360_shutdown(struct i2c_client *client) 502 { 503 struct tps62360_chip *tps = i2c_get_clientdata(client); 504 int st; 505 506 if (!tps->en_discharge) 507 return; 508 509 /* Configure the output discharge path */ 510 st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2)); 511 if (st < 0) 512 dev_err(tps->dev, 513 "%s(): register %d update failed with err %d\n", 514 __func__, REG_RAMPCTRL, st); 515 } 516 517 static const struct i2c_device_id tps62360_id[] = { 518 {.name = "tps62360", .driver_data = TPS62360}, 519 {.name = "tps62361", .driver_data = TPS62361}, 520 {.name = "tps62362", .driver_data = TPS62362}, 521 {.name = "tps62363", .driver_data = TPS62363}, 522 {}, 523 }; 524 525 MODULE_DEVICE_TABLE(i2c, tps62360_id); 526 527 static struct i2c_driver tps62360_i2c_driver = { 528 .driver = { 529 .name = "tps62360", 530 .owner = THIS_MODULE, 531 .of_match_table = of_match_ptr(tps62360_of_match), 532 }, 533 .probe = tps62360_probe, 534 .remove = tps62360_remove, 535 .shutdown = tps62360_shutdown, 536 .id_table = tps62360_id, 537 }; 538 539 static int __init tps62360_init(void) 540 { 541 return i2c_add_driver(&tps62360_i2c_driver); 542 } 543 subsys_initcall(tps62360_init); 544 545 static void __exit tps62360_cleanup(void) 546 { 547 i2c_del_driver(&tps62360_i2c_driver); 548 } 549 module_exit(tps62360_cleanup); 550 551 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 552 MODULE_DESCRIPTION("TPS6236x voltage regulator driver"); 553 MODULE_LICENSE("GPL v2"); 554