1 /* 2 * Regulator driver for tps65090 power management chip. 3 * 4 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. 5 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/> 17 */ 18 19 #include <linux/module.h> 20 #include <linux/delay.h> 21 #include <linux/init.h> 22 #include <linux/gpio.h> 23 #include <linux/of_gpio.h> 24 #include <linux/slab.h> 25 #include <linux/err.h> 26 #include <linux/platform_device.h> 27 #include <linux/regulator/driver.h> 28 #include <linux/regulator/machine.h> 29 #include <linux/regulator/of_regulator.h> 30 #include <linux/mfd/tps65090.h> 31 32 #define MAX_CTRL_READ_TRIES 5 33 #define MAX_FET_ENABLE_TRIES 1000 34 35 #define CTRL_EN_BIT 0 /* Regulator enable bit, active high */ 36 #define CTRL_WT_BIT 2 /* Regulator wait time 0 bit */ 37 #define CTRL_PG_BIT 4 /* Regulator power good bit, 1=good */ 38 #define CTRL_TO_BIT 7 /* Regulator timeout bit, 1=wait */ 39 40 #define MAX_OVERCURRENT_WAIT 3 /* Overcurrent wait must be <= this */ 41 42 /** 43 * struct tps65090_regulator - Per-regulator data for a tps65090 regulator 44 * 45 * @dev: Pointer to our device. 46 * @desc: The struct regulator_desc for the regulator. 47 * @rdev: The struct regulator_dev for the regulator. 48 * @overcurrent_wait_valid: True if overcurrent_wait is valid. 49 * @overcurrent_wait: For FETs, the value to put in the WTFET bitfield. 50 */ 51 52 struct tps65090_regulator { 53 struct device *dev; 54 struct regulator_desc *desc; 55 struct regulator_dev *rdev; 56 bool overcurrent_wait_valid; 57 int overcurrent_wait; 58 }; 59 60 static struct regulator_ops tps65090_ext_control_ops = { 61 }; 62 63 /** 64 * tps65090_reg_set_overcurrent_wait - Setup overcurrent wait 65 * 66 * This will set the overcurrent wait time based on what's in the regulator 67 * info. 68 * 69 * @ri: Overall regulator data 70 * @rdev: Regulator device 71 * 72 * Return: 0 if no error, non-zero if there was an error writing the register. 73 */ 74 static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri, 75 struct regulator_dev *rdev) 76 { 77 int ret; 78 79 ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 80 MAX_OVERCURRENT_WAIT << CTRL_WT_BIT, 81 ri->overcurrent_wait << CTRL_WT_BIT); 82 if (ret) { 83 dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n", 84 rdev->desc->enable_reg); 85 } 86 87 return ret; 88 } 89 90 /** 91 * tps65090_try_enable_fet - Try to enable a FET 92 * 93 * @rdev: Regulator device 94 * 95 * Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get 96 * set, or some other -ve value if another error occurred (e.g. i2c error) 97 */ 98 static int tps65090_try_enable_fet(struct regulator_dev *rdev) 99 { 100 unsigned int control; 101 int ret, i; 102 103 ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 104 rdev->desc->enable_mask, 105 rdev->desc->enable_mask); 106 if (ret < 0) { 107 dev_err(&rdev->dev, "Error in updating reg %#x\n", 108 rdev->desc->enable_reg); 109 return ret; 110 } 111 112 for (i = 0; i < MAX_CTRL_READ_TRIES; i++) { 113 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, 114 &control); 115 if (ret < 0) 116 return ret; 117 118 if (!(control & BIT(CTRL_TO_BIT))) 119 break; 120 121 usleep_range(1000, 1500); 122 } 123 if (!(control & BIT(CTRL_PG_BIT))) 124 return -ENOTRECOVERABLE; 125 126 return 0; 127 } 128 129 /** 130 * tps65090_fet_enable - Enable a FET, trying a few times if it fails 131 * 132 * Some versions of the tps65090 have issues when turning on the FETs. 133 * This function goes through several steps to ensure the best chance of the 134 * FET going on. Specifically: 135 * - We'll make sure that we bump the "overcurrent wait" to the maximum, which 136 * increases the chances that we'll turn on properly. 137 * - We'll retry turning the FET on multiple times (turning off in between). 138 * 139 * @rdev: Regulator device 140 * 141 * Return: 0 if ok, non-zero if it fails. 142 */ 143 static int tps65090_fet_enable(struct regulator_dev *rdev) 144 { 145 int ret, tries; 146 147 /* 148 * Try enabling multiple times until we succeed since sometimes the 149 * first try times out. 150 */ 151 tries = 0; 152 while (true) { 153 ret = tps65090_try_enable_fet(rdev); 154 if (!ret) 155 break; 156 if (ret != -ENOTRECOVERABLE || tries == MAX_FET_ENABLE_TRIES) 157 goto err; 158 159 /* Try turning the FET off (and then on again) */ 160 ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 161 rdev->desc->enable_mask, 0); 162 if (ret) 163 goto err; 164 165 tries++; 166 } 167 168 if (tries) 169 dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n", 170 rdev->desc->enable_reg, tries); 171 172 return 0; 173 err: 174 dev_warn(&rdev->dev, "reg %#x enable failed\n", rdev->desc->enable_reg); 175 WARN_ON(1); 176 177 return ret; 178 } 179 180 static struct regulator_ops tps65090_reg_control_ops = { 181 .enable = regulator_enable_regmap, 182 .disable = regulator_disable_regmap, 183 .is_enabled = regulator_is_enabled_regmap, 184 }; 185 186 static struct regulator_ops tps65090_fet_control_ops = { 187 .enable = tps65090_fet_enable, 188 .disable = regulator_disable_regmap, 189 .is_enabled = regulator_is_enabled_regmap, 190 }; 191 192 static struct regulator_ops tps65090_ldo_ops = { 193 }; 194 195 #define tps65090_REG_DESC(_id, _sname, _en_reg, _en_bits, _nvolt, _volt, _ops) \ 196 { \ 197 .name = "TPS65090_RAILS"#_id, \ 198 .supply_name = _sname, \ 199 .id = TPS65090_REGULATOR_##_id, \ 200 .n_voltages = _nvolt, \ 201 .ops = &_ops, \ 202 .fixed_uV = _volt, \ 203 .enable_reg = _en_reg, \ 204 .enable_val = _en_bits, \ 205 .enable_mask = _en_bits, \ 206 .type = REGULATOR_VOLTAGE, \ 207 .owner = THIS_MODULE, \ 208 } 209 210 #define tps65090_REG_FIXEDV(_id, _sname, en_reg, _en_bits, _volt, _ops) \ 211 tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 1, _volt, _ops) 212 213 #define tps65090_REG_SWITCH(_id, _sname, en_reg, _en_bits, _ops) \ 214 tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 0, 0, _ops) 215 216 static struct regulator_desc tps65090_regulator_desc[] = { 217 tps65090_REG_FIXEDV(DCDC1, "vsys1", 0x0C, BIT(CTRL_EN_BIT), 5000000, 218 tps65090_reg_control_ops), 219 tps65090_REG_FIXEDV(DCDC2, "vsys2", 0x0D, BIT(CTRL_EN_BIT), 3300000, 220 tps65090_reg_control_ops), 221 tps65090_REG_SWITCH(DCDC3, "vsys3", 0x0E, BIT(CTRL_EN_BIT), 222 tps65090_reg_control_ops), 223 224 tps65090_REG_SWITCH(FET1, "infet1", 0x0F, 225 BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), 226 tps65090_fet_control_ops), 227 tps65090_REG_SWITCH(FET2, "infet2", 0x10, 228 BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), 229 tps65090_fet_control_ops), 230 tps65090_REG_SWITCH(FET3, "infet3", 0x11, 231 BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), 232 tps65090_fet_control_ops), 233 tps65090_REG_SWITCH(FET4, "infet4", 0x12, 234 BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), 235 tps65090_fet_control_ops), 236 tps65090_REG_SWITCH(FET5, "infet5", 0x13, 237 BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), 238 tps65090_fet_control_ops), 239 tps65090_REG_SWITCH(FET6, "infet6", 0x14, 240 BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), 241 tps65090_fet_control_ops), 242 tps65090_REG_SWITCH(FET7, "infet7", 0x15, 243 BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT), 244 tps65090_fet_control_ops), 245 246 tps65090_REG_FIXEDV(LDO1, "vsys-l1", 0, 0, 5000000, 247 tps65090_ldo_ops), 248 tps65090_REG_FIXEDV(LDO2, "vsys-l2", 0, 0, 3300000, 249 tps65090_ldo_ops), 250 }; 251 252 static inline bool is_dcdc(int id) 253 { 254 switch (id) { 255 case TPS65090_REGULATOR_DCDC1: 256 case TPS65090_REGULATOR_DCDC2: 257 case TPS65090_REGULATOR_DCDC3: 258 return true; 259 default: 260 return false; 261 } 262 } 263 264 static int tps65090_config_ext_control( 265 struct tps65090_regulator *ri, bool enable) 266 { 267 int ret; 268 struct device *parent = ri->dev->parent; 269 unsigned int reg_en_reg = ri->desc->enable_reg; 270 271 if (enable) 272 ret = tps65090_set_bits(parent, reg_en_reg, 1); 273 else 274 ret = tps65090_clr_bits(parent, reg_en_reg, 1); 275 if (ret < 0) 276 dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg); 277 return ret; 278 } 279 280 static int tps65090_regulator_disable_ext_control( 281 struct tps65090_regulator *ri, 282 struct tps65090_regulator_plat_data *tps_pdata) 283 { 284 int ret = 0; 285 struct device *parent = ri->dev->parent; 286 unsigned int reg_en_reg = ri->desc->enable_reg; 287 288 /* 289 * First enable output for internal control if require. 290 * And then disable external control. 291 */ 292 if (tps_pdata->reg_init_data->constraints.always_on || 293 tps_pdata->reg_init_data->constraints.boot_on) { 294 ret = tps65090_set_bits(parent, reg_en_reg, 0); 295 if (ret < 0) { 296 dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg); 297 return ret; 298 } 299 } 300 return tps65090_config_ext_control(ri, false); 301 } 302 303 static void tps65090_configure_regulator_config( 304 struct tps65090_regulator_plat_data *tps_pdata, 305 struct regulator_config *config) 306 { 307 if (gpio_is_valid(tps_pdata->gpio)) { 308 int gpio_flag = GPIOF_OUT_INIT_LOW; 309 310 if (tps_pdata->reg_init_data->constraints.always_on || 311 tps_pdata->reg_init_data->constraints.boot_on) 312 gpio_flag = GPIOF_OUT_INIT_HIGH; 313 314 config->ena_gpio = tps_pdata->gpio; 315 config->ena_gpio_flags = gpio_flag; 316 } 317 } 318 319 #ifdef CONFIG_OF 320 static struct of_regulator_match tps65090_matches[] = { 321 { .name = "dcdc1", }, 322 { .name = "dcdc2", }, 323 { .name = "dcdc3", }, 324 { .name = "fet1", }, 325 { .name = "fet2", }, 326 { .name = "fet3", }, 327 { .name = "fet4", }, 328 { .name = "fet5", }, 329 { .name = "fet6", }, 330 { .name = "fet7", }, 331 { .name = "ldo1", }, 332 { .name = "ldo2", }, 333 }; 334 335 static struct tps65090_platform_data *tps65090_parse_dt_reg_data( 336 struct platform_device *pdev, 337 struct of_regulator_match **tps65090_reg_matches) 338 { 339 struct tps65090_platform_data *tps65090_pdata; 340 struct device_node *np = pdev->dev.parent->of_node; 341 struct device_node *regulators; 342 int idx = 0, ret; 343 struct tps65090_regulator_plat_data *reg_pdata; 344 345 tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata), 346 GFP_KERNEL); 347 if (!tps65090_pdata) 348 return ERR_PTR(-ENOMEM); 349 350 reg_pdata = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * 351 sizeof(*reg_pdata), GFP_KERNEL); 352 if (!reg_pdata) 353 return ERR_PTR(-ENOMEM); 354 355 regulators = of_get_child_by_name(np, "regulators"); 356 if (!regulators) { 357 dev_err(&pdev->dev, "regulator node not found\n"); 358 return ERR_PTR(-ENODEV); 359 } 360 361 ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches, 362 ARRAY_SIZE(tps65090_matches)); 363 of_node_put(regulators); 364 if (ret < 0) { 365 dev_err(&pdev->dev, 366 "Error parsing regulator init data: %d\n", ret); 367 return ERR_PTR(ret); 368 } 369 370 *tps65090_reg_matches = tps65090_matches; 371 for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) { 372 struct regulator_init_data *ri_data; 373 struct tps65090_regulator_plat_data *rpdata; 374 375 rpdata = ®_pdata[idx]; 376 ri_data = tps65090_matches[idx].init_data; 377 if (!ri_data || !tps65090_matches[idx].of_node) 378 continue; 379 380 rpdata->reg_init_data = ri_data; 381 rpdata->enable_ext_control = of_property_read_bool( 382 tps65090_matches[idx].of_node, 383 "ti,enable-ext-control"); 384 if (rpdata->enable_ext_control) 385 rpdata->gpio = of_get_named_gpio(np, 386 "dcdc-ext-control-gpios", 0); 387 388 if (of_property_read_u32(tps65090_matches[idx].of_node, 389 "ti,overcurrent-wait", 390 &rpdata->overcurrent_wait) == 0) 391 rpdata->overcurrent_wait_valid = true; 392 393 tps65090_pdata->reg_pdata[idx] = rpdata; 394 } 395 return tps65090_pdata; 396 } 397 #else 398 static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data( 399 struct platform_device *pdev, 400 struct of_regulator_match **tps65090_reg_matches) 401 { 402 *tps65090_reg_matches = NULL; 403 return NULL; 404 } 405 #endif 406 407 static int tps65090_regulator_probe(struct platform_device *pdev) 408 { 409 struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent); 410 struct tps65090_regulator *ri = NULL; 411 struct regulator_config config = { }; 412 struct regulator_dev *rdev; 413 struct tps65090_regulator_plat_data *tps_pdata; 414 struct tps65090_regulator *pmic; 415 struct tps65090_platform_data *tps65090_pdata; 416 struct of_regulator_match *tps65090_reg_matches = NULL; 417 int num; 418 int ret; 419 420 dev_dbg(&pdev->dev, "Probing regulator\n"); 421 422 tps65090_pdata = dev_get_platdata(pdev->dev.parent); 423 if (!tps65090_pdata && tps65090_mfd->dev->of_node) 424 tps65090_pdata = tps65090_parse_dt_reg_data(pdev, 425 &tps65090_reg_matches); 426 if (IS_ERR_OR_NULL(tps65090_pdata)) { 427 dev_err(&pdev->dev, "Platform data missing\n"); 428 return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL; 429 } 430 431 pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic), 432 GFP_KERNEL); 433 if (!pmic) 434 return -ENOMEM; 435 436 for (num = 0; num < TPS65090_REGULATOR_MAX; num++) { 437 tps_pdata = tps65090_pdata->reg_pdata[num]; 438 439 ri = &pmic[num]; 440 ri->dev = &pdev->dev; 441 ri->desc = &tps65090_regulator_desc[num]; 442 if (tps_pdata) { 443 ri->overcurrent_wait_valid = 444 tps_pdata->overcurrent_wait_valid; 445 ri->overcurrent_wait = tps_pdata->overcurrent_wait; 446 } 447 448 /* 449 * TPS5090 DCDC support the control from external digital input. 450 * Configure it as per platform data. 451 */ 452 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) { 453 if (tps_pdata->enable_ext_control) { 454 tps65090_configure_regulator_config( 455 tps_pdata, &config); 456 ri->desc->ops = &tps65090_ext_control_ops; 457 } else { 458 ret = tps65090_regulator_disable_ext_control( 459 ri, tps_pdata); 460 if (ret < 0) { 461 dev_err(&pdev->dev, 462 "failed disable ext control\n"); 463 return ret; 464 } 465 } 466 } 467 468 config.dev = pdev->dev.parent; 469 config.driver_data = ri; 470 config.regmap = tps65090_mfd->rmap; 471 if (tps_pdata) 472 config.init_data = tps_pdata->reg_init_data; 473 else 474 config.init_data = NULL; 475 if (tps65090_reg_matches) 476 config.of_node = tps65090_reg_matches[num].of_node; 477 else 478 config.of_node = NULL; 479 480 rdev = devm_regulator_register(&pdev->dev, ri->desc, &config); 481 if (IS_ERR(rdev)) { 482 dev_err(&pdev->dev, "failed to register regulator %s\n", 483 ri->desc->name); 484 return PTR_ERR(rdev); 485 } 486 ri->rdev = rdev; 487 488 if (ri->overcurrent_wait_valid) { 489 ret = tps65090_reg_set_overcurrent_wait(ri, rdev); 490 if (ret < 0) 491 return ret; 492 } 493 494 /* Enable external control if it is require */ 495 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data && 496 tps_pdata->enable_ext_control) { 497 ret = tps65090_config_ext_control(ri, true); 498 if (ret < 0) 499 return ret; 500 } 501 } 502 503 platform_set_drvdata(pdev, pmic); 504 return 0; 505 } 506 507 static struct platform_driver tps65090_regulator_driver = { 508 .driver = { 509 .name = "tps65090-pmic", 510 .owner = THIS_MODULE, 511 }, 512 .probe = tps65090_regulator_probe, 513 }; 514 515 static int __init tps65090_regulator_init(void) 516 { 517 return platform_driver_register(&tps65090_regulator_driver); 518 } 519 subsys_initcall(tps65090_regulator_init); 520 521 static void __exit tps65090_regulator_exit(void) 522 { 523 platform_driver_unregister(&tps65090_regulator_driver); 524 } 525 module_exit(tps65090_regulator_exit); 526 527 MODULE_DESCRIPTION("tps65090 regulator driver"); 528 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); 529 MODULE_LICENSE("GPL v2"); 530 MODULE_ALIAS("platform:tps65090-pmic"); 531