907 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2// 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 0x0414 15#define QCOM_LAB_TYPE 0x2416#define QCOM_IBB_TYPE 0x2017 18#define PMI8998_LAB_REG_BASE 0xde0019#define PMI8998_IBB_REG_BASE 0xdc0020#define PMI8998_IBB_LAB_REG_OFFSET 0x20021 22#define REG_LABIBB_STATUS1 0x0823 #define LABIBB_STATUS1_SC_BIT BIT(6)24 #define LABIBB_STATUS1_VREG_OK_BIT BIT(7)25 26#define REG_LABIBB_INT_SET_TYPE 0x1127#define REG_LABIBB_INT_POLARITY_HIGH 0x1228#define REG_LABIBB_INT_POLARITY_LOW 0x1329#define REG_LABIBB_INT_LATCHED_CLR 0x1430#define REG_LABIBB_INT_EN_SET 0x1531#define REG_LABIBB_INT_EN_CLR 0x1632 #define LABIBB_INT_VREG_OK BIT(0)33 #define LABIBB_INT_VREG_TYPE_LEVEL 034 35#define REG_LABIBB_VOLTAGE 0x4136 #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 0x4641 #define LABIBB_CONTROL_ENABLE BIT(7)42 43#define REG_LABIBB_PD_CTL 0x4744 #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 0x4b51 #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 0x5857 #define IBB_CTL_1_DISCHARGE_EN BIT(2)58 59#define REG_LABIBB_SOFT_START_CTL 0x5f60#define REG_LABIBB_SEC_ACCESS 0xd061 #define LABIBB_SEC_UNLOCK_CODE 0xa562 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 100067#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 100070#define OCP_RECOVERY_INTERVAL_MS 50071#define SC_RECOVERY_INTERVAL_MS 25072#define LABIBB_MAX_OCP_COUNT 473#define LABIBB_MAX_SC_COUNT 374#define LABIBB_MAX_FATAL_COUNT 275 76struct labibb_current_limits {77 u32 uA_min;78 u32 uA_step;79 u8 ovr_val;80};81 82struct 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 101struct labibb_regulator_data {102 const char *name;103 u8 type;104 u16 base;105 const struct regulator_desc *desc;106};107 108static 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 126static 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 status137 * @vreg: Main driver structure138 *139 * This function checks the STATUS1 register for the VREG_OK bit: if it is140 * set, then there is no Over-Current event.141 *142 * Returns: Zero if there is no over-current, 1 if in over-current or143 * negative number for error144 */145static 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 event160 * @work: OCP work structure161 *162 * This is the worker function to handle the Over Current Protection163 * hardware event; This will check if the hardware is still164 * signaling an over-current condition and will eventually stop165 * the regulator if such condition is still signaled after166 * LABIBB_MAX_OCP_COUNT times.167 *168 * If the driver that is consuming the regulator did not take action169 * for the OCP condition, or the hardware did not stabilize, a cut170 * of the LAB and IBB regulators will be forced (regulators will be171 * disabled).172 *173 * As last, if the writes to shut down the LAB/IBB regulators fail174 * for more than LABIBB_MAX_FATAL_COUNT, then a kernel panic will be175 * triggered, as a last resort to protect the hardware from burning;176 * this, however, is expected to never happen, but this is kept to177 * try to further ensure that we protect the hardware at all costs.178 */179static 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 but192 * we kept failing, there's only one last hope to save our193 * hardware from the death: raise a kernel bug, reboot and194 * hope that the bootloader kindly saves us. This, though195 * is done only as paranoid checking, because failing the196 * 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 232reschedule: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 Protection239 * @irq: Interrupt number240 * @chip: Main driver structure241 *242 * Over Current Protection (OCP) will signal to the client driver243 * that an over-current event has happened and then will schedule244 * a recovery worker.245 *246 * Disabling and eventually re-enabling the regulator is expected247 * to be done by the driver, as some hardware may be triggering an248 * over-current condition only at first initialization or it may249 * be expected only for a very brief amount of time, after which250 * the attached hardware may be expected to stabilize its current251 * draw.252 *253 * Returns: IRQ_HANDLED for success or IRQ_NONE for failure.254 */255static 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 IRQ_HANDLED;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 hardware271 * damage at all costs, we assume that the overcurrent event was272 * 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 300end: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 310static 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 setting320 * 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 status379 * @vreg: Main driver structure380 *381 * This function checks the STATUS1 register on both LAB and IBB regulators382 * for the ShortCircuit bit: if it is set on *any* of them, then we have383 * experienced a short-circuit event.384 *385 * Returns: Zero if there is no short-circuit, 1 if in short-circuit or386 * negative number for error387 */388static 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 else398 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 event413 * @work: SC work structure414 *415 * This is the worker function to handle the Short Circuit Protection416 * hardware event; This will check if the hardware is still417 * signaling a short-circuit condition and will eventually never418 * re-enable the regulator if such condition is still signaled after419 * LABIBB_MAX_SC_COUNT times.420 *421 * If the driver that is consuming the regulator did not take action422 * for the SC condition, or the hardware did not stabilize, this423 * worker will stop rescheduling, leaving the regulators disabled424 * as already done by the Portable Batch System (PBS).425 *426 * Returns: IRQ_HANDLED for success or IRQ_NONE for failure.427 */428static 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 we442 * kept failing, then just bail out, as the Portable Batch System443 * (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 LAB454 * and IBB when a short-circuit event is detected, so we have to455 * 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 else461 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 successfully493 * recovered from the SC condition or we had a spurious SC IRQ,494 * which means that we can re-enable the regulators, if they495 * 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 506reschedule:507 /*508 * Now that we have done basic handling of the short-circuit,509 * reschedule this worker in the regular system workqueue, as510 * 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 Protection519 * @irq: Interrupt number520 * @chip: Main driver structure521 *522 * Short Circuit Protection (SCP) will signal to the client driver523 * that a regulation-out event has happened and then will schedule524 * a recovery worker.525 *526 * The LAB and IBB regulators will be automatically disabled by the527 * Portable Batch System (PBS) and they will be enabled again by528 * the worker function if the hardware stops signaling the short529 * circuit event.530 *531 * Returns: IRQ_HANDLED for success or IRQ_NONE for failure.532 */533static 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 560static 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 595static 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 611static 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 else619 val = vreg->soft_start_sel;620 621 return regmap_write(rdev->regmap, rdev->desc->soft_start_reg, val);622}623 624static 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 */635static const int dischg_resistor_values[] = { 300, 64, 32, 16 };636 637/* Soft start time in microseconds */638static const int soft_start_values[] = { 200, 400, 600, 800 };639 640static 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 675static 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 691static 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 718static 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 749static 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 755static const struct of_device_id qcom_labibb_match[] = {756 { .compatible = "qcom,pmi8998-lab-ibb", .data = &pmi8998_labibb_data},757 { },758};759MODULE_DEVICE_TABLE(of, qcom_labibb_match);760 761static 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 labibb_regulator_data *reg_data;768 struct regmap *reg_regmap;769 unsigned int type;770 int ret;771 772 reg_regmap = dev_get_regmap(pdev->dev.parent, NULL);773 if (!reg_regmap) {774 dev_err(&pdev->dev, "Couldn't get parent's regmap\n");775 return -ENODEV;776 }777 778 reg_data = device_get_match_data(&pdev->dev);779 if (!reg_data)780 return -ENODEV;781 782 for (; reg_data->name; reg_data++) {783 char *sc_irq_name;784 int irq = 0;785 786 /* Validate if the type of regulator is indeed787 * what's mentioned in DT.788 */789 ret = regmap_read(reg_regmap, reg_data->base + REG_PERPH_TYPE,790 &type);791 if (ret < 0) {792 dev_err(dev,793 "Peripheral type read failed ret=%d\n",794 ret);795 return -EINVAL;796 }797 798 if (WARN_ON((type != QCOM_LAB_TYPE) && (type != QCOM_IBB_TYPE)) ||799 WARN_ON(type != reg_data->type))800 return -EINVAL;801 802 vreg = devm_kzalloc(&pdev->dev, sizeof(*vreg),803 GFP_KERNEL);804 if (!vreg)805 return -ENOMEM;806 807 sc_irq_name = devm_kasprintf(dev, GFP_KERNEL,808 "%s-short-circuit",809 reg_data->name);810 if (!sc_irq_name)811 return -ENOMEM;812 813 reg_node = of_get_child_by_name(pdev->dev.of_node,814 reg_data->name);815 if (!reg_node)816 return -EINVAL;817 818 /* The Short Circuit interrupt is critical */819 irq = of_irq_get_byname(reg_node, "sc-err");820 if (irq <= 0) {821 if (irq == 0)822 irq = -EINVAL;823 824 of_node_put(reg_node);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 893static struct platform_driver qcom_labibb_regulator_driver = {894 .driver = {895 .name = "qcom-lab-ibb-regulator",896 .probe_type = PROBE_PREFER_ASYNCHRONOUS,897 .of_match_table = qcom_labibb_match,898 },899 .probe = qcom_labibb_regulator_probe,900};901module_platform_driver(qcom_labibb_regulator_driver);902 903MODULE_DESCRIPTION("Qualcomm labibb driver");904MODULE_AUTHOR("Nisha Kumari <nishakumari@codeaurora.org>");905MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");906MODULE_LICENSE("GPL v2");907