1 // SPDX-License-Identifier: GPL-2.0-only 2 // Copyright (c) 2020, The Linux Foundation. All rights reserved. 3 4 #include <linux/module.h> 5 #include <linux/of_irq.h> 6 #include <linux/of.h> 7 #include <linux/of_device.h> 8 #include <linux/platform_device.h> 9 #include <linux/regmap.h> 10 #include <linux/regulator/driver.h> 11 #include <linux/regulator/of_regulator.h> 12 13 #define REG_PERPH_TYPE 0x04 14 15 #define QCOM_LAB_TYPE 0x24 16 #define QCOM_IBB_TYPE 0x20 17 18 #define PMI8998_LAB_REG_BASE 0xde00 19 #define PMI8998_IBB_REG_BASE 0xdc00 20 #define PMI8998_IBB_LAB_REG_OFFSET 0x200 21 22 #define REG_LABIBB_STATUS1 0x08 23 #define LABIBB_STATUS1_SC_BIT BIT(6) 24 #define LABIBB_STATUS1_VREG_OK_BIT BIT(7) 25 26 #define REG_LABIBB_INT_SET_TYPE 0x11 27 #define REG_LABIBB_INT_POLARITY_HIGH 0x12 28 #define REG_LABIBB_INT_POLARITY_LOW 0x13 29 #define REG_LABIBB_INT_LATCHED_CLR 0x14 30 #define REG_LABIBB_INT_EN_SET 0x15 31 #define REG_LABIBB_INT_EN_CLR 0x16 32 #define LABIBB_INT_VREG_OK BIT(0) 33 #define LABIBB_INT_VREG_TYPE_LEVEL 0 34 35 #define REG_LABIBB_VOLTAGE 0x41 36 #define LABIBB_VOLTAGE_OVERRIDE_EN BIT(7) 37 #define LAB_VOLTAGE_SET_MASK GENMASK(3, 0) 38 #define IBB_VOLTAGE_SET_MASK GENMASK(5, 0) 39 40 #define REG_LABIBB_ENABLE_CTL 0x46 41 #define LABIBB_CONTROL_ENABLE BIT(7) 42 43 #define REG_LABIBB_PD_CTL 0x47 44 #define LAB_PD_CTL_MASK GENMASK(1, 0) 45 #define IBB_PD_CTL_MASK (BIT(0) | BIT(7)) 46 #define LAB_PD_CTL_STRONG_PULL BIT(0) 47 #define IBB_PD_CTL_HALF_STRENGTH BIT(0) 48 #define IBB_PD_CTL_EN BIT(7) 49 50 #define REG_LABIBB_CURRENT_LIMIT 0x4b 51 #define LAB_CURRENT_LIMIT_MASK GENMASK(2, 0) 52 #define IBB_CURRENT_LIMIT_MASK GENMASK(4, 0) 53 #define LAB_CURRENT_LIMIT_OVERRIDE_EN BIT(3) 54 #define LABIBB_CURRENT_LIMIT_EN BIT(7) 55 56 #define REG_IBB_PWRUP_PWRDN_CTL_1 0x58 57 #define IBB_CTL_1_DISCHARGE_EN BIT(2) 58 59 #define REG_LABIBB_SOFT_START_CTL 0x5f 60 #define REG_LABIBB_SEC_ACCESS 0xd0 61 #define LABIBB_SEC_UNLOCK_CODE 0xa5 62 63 #define LAB_ENABLE_CTL_MASK BIT(7) 64 #define IBB_ENABLE_CTL_MASK (BIT(7) | BIT(6)) 65 66 #define LABIBB_OFF_ON_DELAY 1000 67 #define LAB_ENABLE_TIME (LABIBB_OFF_ON_DELAY * 2) 68 #define IBB_ENABLE_TIME (LABIBB_OFF_ON_DELAY * 10) 69 #define LABIBB_POLL_ENABLED_TIME 1000 70 #define OCP_RECOVERY_INTERVAL_MS 500 71 #define SC_RECOVERY_INTERVAL_MS 250 72 #define LABIBB_MAX_OCP_COUNT 4 73 #define LABIBB_MAX_SC_COUNT 3 74 #define LABIBB_MAX_FATAL_COUNT 2 75 76 struct labibb_current_limits { 77 u32 uA_min; 78 u32 uA_step; 79 u8 ovr_val; 80 }; 81 82 struct labibb_regulator { 83 struct regulator_desc desc; 84 struct device *dev; 85 struct regmap *regmap; 86 struct regulator_dev *rdev; 87 struct labibb_current_limits uA_limits; 88 struct delayed_work ocp_recovery_work; 89 struct delayed_work sc_recovery_work; 90 u16 base; 91 u8 type; 92 u8 dischg_sel; 93 u8 soft_start_sel; 94 int sc_irq; 95 int sc_count; 96 int ocp_irq; 97 int ocp_irq_count; 98 int fatal_count; 99 }; 100 101 struct labibb_regulator_data { 102 const char *name; 103 u8 type; 104 u16 base; 105 const struct regulator_desc *desc; 106 }; 107 108 static int qcom_labibb_ocp_hw_enable(struct regulator_dev *rdev) 109 { 110 struct labibb_regulator *vreg = rdev_get_drvdata(rdev); 111 int ret; 112 113 /* Clear irq latch status to avoid spurious event */ 114 ret = regmap_update_bits(rdev->regmap, 115 vreg->base + REG_LABIBB_INT_LATCHED_CLR, 116 LABIBB_INT_VREG_OK, 1); 117 if (ret) 118 return ret; 119 120 /* Enable OCP HW interrupt */ 121 return regmap_update_bits(rdev->regmap, 122 vreg->base + REG_LABIBB_INT_EN_SET, 123 LABIBB_INT_VREG_OK, 1); 124 } 125 126 static int qcom_labibb_ocp_hw_disable(struct regulator_dev *rdev) 127 { 128 struct labibb_regulator *vreg = rdev_get_drvdata(rdev); 129 130 return regmap_update_bits(rdev->regmap, 131 vreg->base + REG_LABIBB_INT_EN_CLR, 132 LABIBB_INT_VREG_OK, 1); 133 } 134 135 /** 136 * qcom_labibb_check_ocp_status - Check the Over-Current Protection status 137 * @vreg: Main driver structure 138 * 139 * This function checks the STATUS1 register for the VREG_OK bit: if it is 140 * set, then there is no Over-Current event. 141 * 142 * Returns: Zero if there is no over-current, 1 if in over-current or 143 * negative number for error 144 */ 145 static int qcom_labibb_check_ocp_status(struct labibb_regulator *vreg) 146 { 147 u32 cur_status; 148 int ret; 149 150 ret = regmap_read(vreg->rdev->regmap, vreg->base + REG_LABIBB_STATUS1, 151 &cur_status); 152 if (ret) 153 return ret; 154 155 return !(cur_status & LABIBB_STATUS1_VREG_OK_BIT); 156 } 157 158 /** 159 * qcom_labibb_ocp_recovery_worker - Handle OCP event 160 * @work: OCP work structure 161 * 162 * This is the worker function to handle the Over Current Protection 163 * hardware event; This will check if the hardware is still 164 * signaling an over-current condition and will eventually stop 165 * the regulator if such condition is still signaled after 166 * LABIBB_MAX_OCP_COUNT times. 167 * 168 * If the driver that is consuming the regulator did not take action 169 * for the OCP condition, or the hardware did not stabilize, a cut 170 * of the LAB and IBB regulators will be forced (regulators will be 171 * disabled). 172 * 173 * As last, if the writes to shut down the LAB/IBB regulators fail 174 * for more than LABIBB_MAX_FATAL_COUNT, then a kernel panic will be 175 * triggered, as a last resort to protect the hardware from burning; 176 * this, however, is expected to never happen, but this is kept to 177 * try to further ensure that we protect the hardware at all costs. 178 */ 179 static void qcom_labibb_ocp_recovery_worker(struct work_struct *work) 180 { 181 struct labibb_regulator *vreg; 182 const struct regulator_ops *ops; 183 int ret; 184 185 vreg = container_of(work, struct labibb_regulator, 186 ocp_recovery_work.work); 187 ops = vreg->rdev->desc->ops; 188 189 if (vreg->ocp_irq_count >= LABIBB_MAX_OCP_COUNT) { 190 /* 191 * If we tried to disable the regulator multiple times but 192 * we kept failing, there's only one last hope to save our 193 * hardware from the death: raise a kernel bug, reboot and 194 * hope that the bootloader kindly saves us. This, though 195 * is done only as paranoid checking, because failing the 196 * regmap write to disable the vreg is almost impossible, 197 * since we got here after multiple regmap R/W. 198 */ 199 BUG_ON(vreg->fatal_count > LABIBB_MAX_FATAL_COUNT); 200 dev_err(&vreg->rdev->dev, "LABIBB: CRITICAL: Disabling regulator\n"); 201 202 /* Disable the regulator immediately to avoid damage */ 203 ret = ops->disable(vreg->rdev); 204 if (ret) { 205 vreg->fatal_count++; 206 goto reschedule; 207 } 208 enable_irq(vreg->ocp_irq); 209 vreg->fatal_count = 0; 210 return; 211 } 212 213 ret = qcom_labibb_check_ocp_status(vreg); 214 if (ret != 0) { 215 vreg->ocp_irq_count++; 216 goto reschedule; 217 } 218 219 ret = qcom_labibb_ocp_hw_enable(vreg->rdev); 220 if (ret) { 221 /* We cannot trust it without OCP enabled. */ 222 dev_err(vreg->dev, "Cannot enable OCP IRQ\n"); 223 vreg->ocp_irq_count++; 224 goto reschedule; 225 } 226 227 enable_irq(vreg->ocp_irq); 228 /* Everything went fine: reset the OCP count! */ 229 vreg->ocp_irq_count = 0; 230 return; 231 232 reschedule: 233 mod_delayed_work(system_wq, &vreg->ocp_recovery_work, 234 msecs_to_jiffies(OCP_RECOVERY_INTERVAL_MS)); 235 } 236 237 /** 238 * qcom_labibb_ocp_isr - Interrupt routine for OverCurrent Protection 239 * @irq: Interrupt number 240 * @chip: Main driver structure 241 * 242 * Over Current Protection (OCP) will signal to the client driver 243 * that an over-current event has happened and then will schedule 244 * a recovery worker. 245 * 246 * Disabling and eventually re-enabling the regulator is expected 247 * to be done by the driver, as some hardware may be triggering an 248 * over-current condition only at first initialization or it may 249 * be expected only for a very brief amount of time, after which 250 * the attached hardware may be expected to stabilize its current 251 * draw. 252 * 253 * Returns: IRQ_HANDLED for success or IRQ_NONE for failure. 254 */ 255 static irqreturn_t qcom_labibb_ocp_isr(int irq, void *chip) 256 { 257 struct labibb_regulator *vreg = chip; 258 const struct regulator_ops *ops = vreg->rdev->desc->ops; 259 int ret; 260 261 /* If the regulator is not enabled, this is a fake event */ 262 if (!ops->is_enabled(vreg->rdev)) 263 return 0; 264 265 /* If we tried to recover for too many times it's not getting better */ 266 if (vreg->ocp_irq_count > LABIBB_MAX_OCP_COUNT) 267 return IRQ_NONE; 268 269 /* 270 * If we (unlikely) can't read this register, to prevent hardware 271 * damage at all costs, we assume that the overcurrent event was 272 * real; Moreover, if the status register is not signaling OCP, 273 * it was a spurious event, so it's all ok. 274 */ 275 ret = qcom_labibb_check_ocp_status(vreg); 276 if (ret == 0) { 277 vreg->ocp_irq_count = 0; 278 goto end; 279 } 280 vreg->ocp_irq_count++; 281 282 /* 283 * Disable the interrupt temporarily, or it will fire continuously; 284 * we will re-enable it in the recovery worker function. 285 */ 286 disable_irq_nosync(irq); 287 288 /* Warn the user for overcurrent */ 289 dev_warn(vreg->dev, "Over-Current interrupt fired!\n"); 290 291 /* Disable the interrupt to avoid hogging */ 292 ret = qcom_labibb_ocp_hw_disable(vreg->rdev); 293 if (ret) 294 goto end; 295 296 /* Signal overcurrent event to drivers */ 297 regulator_notifier_call_chain(vreg->rdev, 298 REGULATOR_EVENT_OVER_CURRENT, NULL); 299 300 end: 301 /* Schedule the recovery work */ 302 schedule_delayed_work(&vreg->ocp_recovery_work, 303 msecs_to_jiffies(OCP_RECOVERY_INTERVAL_MS)); 304 if (ret) 305 return IRQ_NONE; 306 307 return IRQ_HANDLED; 308 } 309 310 static int qcom_labibb_set_ocp(struct regulator_dev *rdev, int lim, 311 int severity, bool enable) 312 { 313 struct labibb_regulator *vreg = rdev_get_drvdata(rdev); 314 char *ocp_irq_name; 315 u32 irq_flags = IRQF_ONESHOT; 316 int irq_trig_low, ret; 317 318 /* 319 * labibb supports only protection - and does not support setting 320 * limit. Furthermore, we don't support disabling protection. 321 */ 322 if (lim || severity != REGULATOR_SEVERITY_PROT || !enable) 323 return -EINVAL; 324 325 /* If there is no OCP interrupt, there's nothing to set */ 326 if (vreg->ocp_irq <= 0) 327 return -EINVAL; 328 329 ocp_irq_name = devm_kasprintf(vreg->dev, GFP_KERNEL, "%s-over-current", 330 vreg->desc.name); 331 if (!ocp_irq_name) 332 return -ENOMEM; 333 334 /* IRQ polarities - LAB: trigger-low, IBB: trigger-high */ 335 switch (vreg->type) { 336 case QCOM_LAB_TYPE: 337 irq_flags |= IRQF_TRIGGER_LOW; 338 irq_trig_low = 1; 339 break; 340 case QCOM_IBB_TYPE: 341 irq_flags |= IRQF_TRIGGER_HIGH; 342 irq_trig_low = 0; 343 break; 344 default: 345 return -EINVAL; 346 } 347 348 /* Activate OCP HW level interrupt */ 349 ret = regmap_update_bits(rdev->regmap, 350 vreg->base + REG_LABIBB_INT_SET_TYPE, 351 LABIBB_INT_VREG_OK, 352 LABIBB_INT_VREG_TYPE_LEVEL); 353 if (ret) 354 return ret; 355 356 /* Set OCP interrupt polarity */ 357 ret = regmap_update_bits(rdev->regmap, 358 vreg->base + REG_LABIBB_INT_POLARITY_HIGH, 359 LABIBB_INT_VREG_OK, !irq_trig_low); 360 if (ret) 361 return ret; 362 ret = regmap_update_bits(rdev->regmap, 363 vreg->base + REG_LABIBB_INT_POLARITY_LOW, 364 LABIBB_INT_VREG_OK, irq_trig_low); 365 if (ret) 366 return ret; 367 368 ret = qcom_labibb_ocp_hw_enable(rdev); 369 if (ret) 370 return ret; 371 372 return devm_request_threaded_irq(vreg->dev, vreg->ocp_irq, NULL, 373 qcom_labibb_ocp_isr, irq_flags, 374 ocp_irq_name, vreg); 375 } 376 377 /** 378 * qcom_labibb_check_sc_status - Check the Short Circuit Protection status 379 * @vreg: Main driver structure 380 * 381 * This function checks the STATUS1 register on both LAB and IBB regulators 382 * for the ShortCircuit bit: if it is set on *any* of them, then we have 383 * experienced a short-circuit event. 384 * 385 * Returns: Zero if there is no short-circuit, 1 if in short-circuit or 386 * negative number for error 387 */ 388 static int qcom_labibb_check_sc_status(struct labibb_regulator *vreg) 389 { 390 u32 ibb_status, ibb_reg, lab_status, lab_reg; 391 int ret; 392 393 /* We have to work on both regulators due to PBS... */ 394 lab_reg = ibb_reg = vreg->base + REG_LABIBB_STATUS1; 395 if (vreg->type == QCOM_LAB_TYPE) 396 ibb_reg -= PMI8998_IBB_LAB_REG_OFFSET; 397 else 398 lab_reg += PMI8998_IBB_LAB_REG_OFFSET; 399 400 ret = regmap_read(vreg->rdev->regmap, lab_reg, &lab_status); 401 if (ret) 402 return ret; 403 ret = regmap_read(vreg->rdev->regmap, ibb_reg, &ibb_status); 404 if (ret) 405 return ret; 406 407 return !!(lab_status & LABIBB_STATUS1_SC_BIT) || 408 !!(ibb_status & LABIBB_STATUS1_SC_BIT); 409 } 410 411 /** 412 * qcom_labibb_sc_recovery_worker - Handle Short Circuit event 413 * @work: SC work structure 414 * 415 * This is the worker function to handle the Short Circuit Protection 416 * hardware event; This will check if the hardware is still 417 * signaling a short-circuit condition and will eventually never 418 * re-enable the regulator if such condition is still signaled after 419 * LABIBB_MAX_SC_COUNT times. 420 * 421 * If the driver that is consuming the regulator did not take action 422 * for the SC condition, or the hardware did not stabilize, this 423 * worker will stop rescheduling, leaving the regulators disabled 424 * as already done by the Portable Batch System (PBS). 425 * 426 * Returns: IRQ_HANDLED for success or IRQ_NONE for failure. 427 */ 428 static void qcom_labibb_sc_recovery_worker(struct work_struct *work) 429 { 430 struct labibb_regulator *vreg; 431 const struct regulator_ops *ops; 432 u32 lab_reg, ibb_reg, lab_val, ibb_val, val; 433 bool pbs_cut = false; 434 int i, sc, ret; 435 436 vreg = container_of(work, struct labibb_regulator, 437 sc_recovery_work.work); 438 ops = vreg->rdev->desc->ops; 439 440 /* 441 * If we tried to check the regulator status multiple times but we 442 * kept failing, then just bail out, as the Portable Batch System 443 * (PBS) will disable the vregs for us, preventing hardware damage. 444 */ 445 if (vreg->fatal_count > LABIBB_MAX_FATAL_COUNT) 446 return; 447 448 /* Too many short-circuit events. Throw in the towel. */ 449 if (vreg->sc_count > LABIBB_MAX_SC_COUNT) 450 return; 451 452 /* 453 * The Portable Batch System (PBS) automatically disables LAB 454 * and IBB when a short-circuit event is detected, so we have to 455 * check and work on both of them at the same time. 456 */ 457 lab_reg = ibb_reg = vreg->base + REG_LABIBB_ENABLE_CTL; 458 if (vreg->type == QCOM_LAB_TYPE) 459 ibb_reg -= PMI8998_IBB_LAB_REG_OFFSET; 460 else 461 lab_reg += PMI8998_IBB_LAB_REG_OFFSET; 462 463 sc = qcom_labibb_check_sc_status(vreg); 464 if (sc) 465 goto reschedule; 466 467 for (i = 0; i < LABIBB_MAX_SC_COUNT; i++) { 468 ret = regmap_read(vreg->regmap, lab_reg, &lab_val); 469 if (ret) { 470 vreg->fatal_count++; 471 goto reschedule; 472 } 473 474 ret = regmap_read(vreg->regmap, ibb_reg, &ibb_val); 475 if (ret) { 476 vreg->fatal_count++; 477 goto reschedule; 478 } 479 val = lab_val & ibb_val; 480 481 if (!(val & LABIBB_CONTROL_ENABLE)) { 482 pbs_cut = true; 483 break; 484 } 485 usleep_range(5000, 6000); 486 } 487 if (pbs_cut) 488 goto reschedule; 489 490 491 /* 492 * If we have reached this point, we either have successfully 493 * recovered from the SC condition or we had a spurious SC IRQ, 494 * which means that we can re-enable the regulators, if they 495 * have ever been disabled by the PBS. 496 */ 497 ret = ops->enable(vreg->rdev); 498 if (ret) 499 goto reschedule; 500 501 /* Everything went fine: reset the OCP count! */ 502 vreg->sc_count = 0; 503 enable_irq(vreg->sc_irq); 504 return; 505 506 reschedule: 507 /* 508 * Now that we have done basic handling of the short-circuit, 509 * reschedule this worker in the regular system workqueue, as 510 * taking action is not truly urgent anymore. 511 */ 512 vreg->sc_count++; 513 mod_delayed_work(system_wq, &vreg->sc_recovery_work, 514 msecs_to_jiffies(SC_RECOVERY_INTERVAL_MS)); 515 } 516 517 /** 518 * qcom_labibb_sc_isr - Interrupt routine for Short Circuit Protection 519 * @irq: Interrupt number 520 * @chip: Main driver structure 521 * 522 * Short Circuit Protection (SCP) will signal to the client driver 523 * that a regulation-out event has happened and then will schedule 524 * a recovery worker. 525 * 526 * The LAB and IBB regulators will be automatically disabled by the 527 * Portable Batch System (PBS) and they will be enabled again by 528 * the worker function if the hardware stops signaling the short 529 * circuit event. 530 * 531 * Returns: IRQ_HANDLED for success or IRQ_NONE for failure. 532 */ 533 static irqreturn_t qcom_labibb_sc_isr(int irq, void *chip) 534 { 535 struct labibb_regulator *vreg = chip; 536 537 if (vreg->sc_count > LABIBB_MAX_SC_COUNT) 538 return IRQ_NONE; 539 540 /* Warn the user for short circuit */ 541 dev_warn(vreg->dev, "Short-Circuit interrupt fired!\n"); 542 543 /* 544 * Disable the interrupt temporarily, or it will fire continuously; 545 * we will re-enable it in the recovery worker function. 546 */ 547 disable_irq_nosync(irq); 548 549 /* Signal out of regulation event to drivers */ 550 regulator_notifier_call_chain(vreg->rdev, 551 REGULATOR_EVENT_REGULATION_OUT, NULL); 552 553 /* Schedule the short-circuit handling as high-priority work */ 554 mod_delayed_work(system_highpri_wq, &vreg->sc_recovery_work, 555 msecs_to_jiffies(SC_RECOVERY_INTERVAL_MS)); 556 return IRQ_HANDLED; 557 } 558 559 560 static int qcom_labibb_set_current_limit(struct regulator_dev *rdev, 561 int min_uA, int max_uA) 562 { 563 struct labibb_regulator *vreg = rdev_get_drvdata(rdev); 564 struct regulator_desc *desc = &vreg->desc; 565 struct labibb_current_limits *lim = &vreg->uA_limits; 566 u32 mask, val; 567 int i, ret, sel = -1; 568 569 if (min_uA < lim->uA_min || max_uA < lim->uA_min) 570 return -EINVAL; 571 572 for (i = 0; i < desc->n_current_limits; i++) { 573 int uA_limit = (lim->uA_step * i) + lim->uA_min; 574 575 if (max_uA >= uA_limit && min_uA <= uA_limit) 576 sel = i; 577 } 578 if (sel < 0) 579 return -EINVAL; 580 581 /* Current limit setting needs secure access */ 582 ret = regmap_write(vreg->regmap, vreg->base + REG_LABIBB_SEC_ACCESS, 583 LABIBB_SEC_UNLOCK_CODE); 584 if (ret) 585 return ret; 586 587 mask = desc->csel_mask | lim->ovr_val; 588 mask |= LABIBB_CURRENT_LIMIT_EN; 589 val = (u32)sel | lim->ovr_val; 590 val |= LABIBB_CURRENT_LIMIT_EN; 591 592 return regmap_update_bits(vreg->regmap, desc->csel_reg, mask, val); 593 } 594 595 static int qcom_labibb_get_current_limit(struct regulator_dev *rdev) 596 { 597 struct labibb_regulator *vreg = rdev_get_drvdata(rdev); 598 struct regulator_desc *desc = &vreg->desc; 599 struct labibb_current_limits *lim = &vreg->uA_limits; 600 unsigned int cur_step; 601 int ret; 602 603 ret = regmap_read(vreg->regmap, desc->csel_reg, &cur_step); 604 if (ret) 605 return ret; 606 cur_step &= desc->csel_mask; 607 608 return (cur_step * lim->uA_step) + lim->uA_min; 609 } 610 611 static int qcom_labibb_set_soft_start(struct regulator_dev *rdev) 612 { 613 struct labibb_regulator *vreg = rdev_get_drvdata(rdev); 614 u32 val = 0; 615 616 if (vreg->type == QCOM_IBB_TYPE) 617 val = vreg->dischg_sel; 618 else 619 val = vreg->soft_start_sel; 620 621 return regmap_write(rdev->regmap, rdev->desc->soft_start_reg, val); 622 } 623 624 static int qcom_labibb_get_table_sel(const int *table, int sz, u32 value) 625 { 626 int i; 627 628 for (i = 0; i < sz; i++) 629 if (table[i] == value) 630 return i; 631 return -EINVAL; 632 } 633 634 /* IBB discharge resistor values in KOhms */ 635 static const int dischg_resistor_values[] = { 300, 64, 32, 16 }; 636 637 /* Soft start time in microseconds */ 638 static const int soft_start_values[] = { 200, 400, 600, 800 }; 639 640 static int qcom_labibb_of_parse_cb(struct device_node *np, 641 const struct regulator_desc *desc, 642 struct regulator_config *config) 643 { 644 struct labibb_regulator *vreg = config->driver_data; 645 u32 dischg_kohms, soft_start_time; 646 int ret; 647 648 ret = of_property_read_u32(np, "qcom,discharge-resistor-kohms", 649 &dischg_kohms); 650 if (ret) 651 dischg_kohms = 300; 652 653 ret = qcom_labibb_get_table_sel(dischg_resistor_values, 654 ARRAY_SIZE(dischg_resistor_values), 655 dischg_kohms); 656 if (ret < 0) 657 return ret; 658 vreg->dischg_sel = (u8)ret; 659 660 ret = of_property_read_u32(np, "qcom,soft-start-us", 661 &soft_start_time); 662 if (ret) 663 soft_start_time = 200; 664 665 ret = qcom_labibb_get_table_sel(soft_start_values, 666 ARRAY_SIZE(soft_start_values), 667 soft_start_time); 668 if (ret < 0) 669 return ret; 670 vreg->soft_start_sel = (u8)ret; 671 672 return 0; 673 } 674 675 static const struct regulator_ops qcom_labibb_ops = { 676 .enable = regulator_enable_regmap, 677 .disable = regulator_disable_regmap, 678 .is_enabled = regulator_is_enabled_regmap, 679 .set_voltage_sel = regulator_set_voltage_sel_regmap, 680 .get_voltage_sel = regulator_get_voltage_sel_regmap, 681 .list_voltage = regulator_list_voltage_linear, 682 .map_voltage = regulator_map_voltage_linear, 683 .set_active_discharge = regulator_set_active_discharge_regmap, 684 .set_pull_down = regulator_set_pull_down_regmap, 685 .set_current_limit = qcom_labibb_set_current_limit, 686 .get_current_limit = qcom_labibb_get_current_limit, 687 .set_soft_start = qcom_labibb_set_soft_start, 688 .set_over_current_protection = qcom_labibb_set_ocp, 689 }; 690 691 static const struct regulator_desc pmi8998_lab_desc = { 692 .enable_mask = LAB_ENABLE_CTL_MASK, 693 .enable_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_ENABLE_CTL), 694 .enable_val = LABIBB_CONTROL_ENABLE, 695 .enable_time = LAB_ENABLE_TIME, 696 .poll_enabled_time = LABIBB_POLL_ENABLED_TIME, 697 .soft_start_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_SOFT_START_CTL), 698 .pull_down_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_PD_CTL), 699 .pull_down_mask = LAB_PD_CTL_MASK, 700 .pull_down_val_on = LAB_PD_CTL_STRONG_PULL, 701 .vsel_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_VOLTAGE), 702 .vsel_mask = LAB_VOLTAGE_SET_MASK, 703 .apply_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_VOLTAGE), 704 .apply_bit = LABIBB_VOLTAGE_OVERRIDE_EN, 705 .csel_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_CURRENT_LIMIT), 706 .csel_mask = LAB_CURRENT_LIMIT_MASK, 707 .n_current_limits = 8, 708 .off_on_delay = LABIBB_OFF_ON_DELAY, 709 .owner = THIS_MODULE, 710 .type = REGULATOR_VOLTAGE, 711 .min_uV = 4600000, 712 .uV_step = 100000, 713 .n_voltages = 16, 714 .ops = &qcom_labibb_ops, 715 .of_parse_cb = qcom_labibb_of_parse_cb, 716 }; 717 718 static const struct regulator_desc pmi8998_ibb_desc = { 719 .enable_mask = IBB_ENABLE_CTL_MASK, 720 .enable_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_ENABLE_CTL), 721 .enable_val = LABIBB_CONTROL_ENABLE, 722 .enable_time = IBB_ENABLE_TIME, 723 .poll_enabled_time = LABIBB_POLL_ENABLED_TIME, 724 .soft_start_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_SOFT_START_CTL), 725 .active_discharge_off = 0, 726 .active_discharge_on = IBB_CTL_1_DISCHARGE_EN, 727 .active_discharge_mask = IBB_CTL_1_DISCHARGE_EN, 728 .active_discharge_reg = (PMI8998_IBB_REG_BASE + REG_IBB_PWRUP_PWRDN_CTL_1), 729 .pull_down_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_PD_CTL), 730 .pull_down_mask = IBB_PD_CTL_MASK, 731 .pull_down_val_on = IBB_PD_CTL_HALF_STRENGTH | IBB_PD_CTL_EN, 732 .vsel_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_VOLTAGE), 733 .vsel_mask = IBB_VOLTAGE_SET_MASK, 734 .apply_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_VOLTAGE), 735 .apply_bit = LABIBB_VOLTAGE_OVERRIDE_EN, 736 .csel_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_CURRENT_LIMIT), 737 .csel_mask = IBB_CURRENT_LIMIT_MASK, 738 .n_current_limits = 32, 739 .off_on_delay = LABIBB_OFF_ON_DELAY, 740 .owner = THIS_MODULE, 741 .type = REGULATOR_VOLTAGE, 742 .min_uV = 1400000, 743 .uV_step = 100000, 744 .n_voltages = 64, 745 .ops = &qcom_labibb_ops, 746 .of_parse_cb = qcom_labibb_of_parse_cb, 747 }; 748 749 static const struct labibb_regulator_data pmi8998_labibb_data[] = { 750 {"lab", QCOM_LAB_TYPE, PMI8998_LAB_REG_BASE, &pmi8998_lab_desc}, 751 {"ibb", QCOM_IBB_TYPE, PMI8998_IBB_REG_BASE, &pmi8998_ibb_desc}, 752 { }, 753 }; 754 755 static const struct of_device_id qcom_labibb_match[] = { 756 { .compatible = "qcom,pmi8998-lab-ibb", .data = &pmi8998_labibb_data}, 757 { }, 758 }; 759 MODULE_DEVICE_TABLE(of, qcom_labibb_match); 760 761 static int qcom_labibb_regulator_probe(struct platform_device *pdev) 762 { 763 struct labibb_regulator *vreg; 764 struct device *dev = &pdev->dev; 765 struct regulator_config cfg = {}; 766 struct device_node *reg_node; 767 const struct of_device_id *match; 768 const struct labibb_regulator_data *reg_data; 769 struct regmap *reg_regmap; 770 unsigned int type; 771 int ret; 772 773 reg_regmap = dev_get_regmap(pdev->dev.parent, NULL); 774 if (!reg_regmap) { 775 dev_err(&pdev->dev, "Couldn't get parent's regmap\n"); 776 return -ENODEV; 777 } 778 779 match = of_match_device(qcom_labibb_match, &pdev->dev); 780 if (!match) 781 return -ENODEV; 782 783 for (reg_data = match->data; reg_data->name; reg_data++) { 784 char *sc_irq_name; 785 int irq = 0; 786 787 /* Validate if the type of regulator is indeed 788 * what's mentioned in DT. 789 */ 790 ret = regmap_read(reg_regmap, reg_data->base + REG_PERPH_TYPE, 791 &type); 792 if (ret < 0) { 793 dev_err(dev, 794 "Peripheral type read failed ret=%d\n", 795 ret); 796 return -EINVAL; 797 } 798 799 if (WARN_ON((type != QCOM_LAB_TYPE) && (type != QCOM_IBB_TYPE)) || 800 WARN_ON(type != reg_data->type)) 801 return -EINVAL; 802 803 vreg = devm_kzalloc(&pdev->dev, sizeof(*vreg), 804 GFP_KERNEL); 805 if (!vreg) 806 return -ENOMEM; 807 808 sc_irq_name = devm_kasprintf(dev, GFP_KERNEL, 809 "%s-short-circuit", 810 reg_data->name); 811 if (!sc_irq_name) 812 return -ENOMEM; 813 814 reg_node = of_get_child_by_name(pdev->dev.of_node, 815 reg_data->name); 816 if (!reg_node) 817 return -EINVAL; 818 819 /* The Short Circuit interrupt is critical */ 820 irq = of_irq_get_byname(reg_node, "sc-err"); 821 if (irq <= 0) { 822 if (irq == 0) 823 irq = -EINVAL; 824 825 return dev_err_probe(vreg->dev, irq, 826 "Short-circuit irq not found.\n"); 827 } 828 vreg->sc_irq = irq; 829 830 /* OverCurrent Protection IRQ is optional */ 831 irq = of_irq_get_byname(reg_node, "ocp"); 832 vreg->ocp_irq = irq; 833 vreg->ocp_irq_count = 0; 834 of_node_put(reg_node); 835 836 vreg->regmap = reg_regmap; 837 vreg->dev = dev; 838 vreg->base = reg_data->base; 839 vreg->type = reg_data->type; 840 INIT_DELAYED_WORK(&vreg->sc_recovery_work, 841 qcom_labibb_sc_recovery_worker); 842 843 if (vreg->ocp_irq > 0) 844 INIT_DELAYED_WORK(&vreg->ocp_recovery_work, 845 qcom_labibb_ocp_recovery_worker); 846 847 switch (vreg->type) { 848 case QCOM_LAB_TYPE: 849 /* LAB Limits: 200-1600mA */ 850 vreg->uA_limits.uA_min = 200000; 851 vreg->uA_limits.uA_step = 200000; 852 vreg->uA_limits.ovr_val = LAB_CURRENT_LIMIT_OVERRIDE_EN; 853 break; 854 case QCOM_IBB_TYPE: 855 /* IBB Limits: 0-1550mA */ 856 vreg->uA_limits.uA_min = 0; 857 vreg->uA_limits.uA_step = 50000; 858 vreg->uA_limits.ovr_val = 0; /* No override bit */ 859 break; 860 default: 861 return -EINVAL; 862 } 863 864 memcpy(&vreg->desc, reg_data->desc, sizeof(vreg->desc)); 865 vreg->desc.of_match = reg_data->name; 866 vreg->desc.name = reg_data->name; 867 868 cfg.dev = vreg->dev; 869 cfg.driver_data = vreg; 870 cfg.regmap = vreg->regmap; 871 872 vreg->rdev = devm_regulator_register(vreg->dev, &vreg->desc, 873 &cfg); 874 875 if (IS_ERR(vreg->rdev)) { 876 dev_err(dev, "qcom_labibb: error registering %s : %d\n", 877 reg_data->name, ret); 878 return PTR_ERR(vreg->rdev); 879 } 880 881 ret = devm_request_threaded_irq(vreg->dev, vreg->sc_irq, NULL, 882 qcom_labibb_sc_isr, 883 IRQF_ONESHOT | 884 IRQF_TRIGGER_RISING, 885 sc_irq_name, vreg); 886 if (ret) 887 return ret; 888 } 889 890 return 0; 891 } 892 893 static struct platform_driver qcom_labibb_regulator_driver = { 894 .driver = { 895 .name = "qcom-lab-ibb-regulator", 896 .of_match_table = qcom_labibb_match, 897 }, 898 .probe = qcom_labibb_regulator_probe, 899 }; 900 module_platform_driver(qcom_labibb_regulator_driver); 901 902 MODULE_DESCRIPTION("Qualcomm labibb driver"); 903 MODULE_AUTHOR("Nisha Kumari <nishakumari@codeaurora.org>"); 904 MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>"); 905 MODULE_LICENSE("GPL v2"); 906