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1// SPDX-License-Identifier: GPL-2.02//3// Copyright 2013 Freescale Semiconductor, Inc.4 5#include <linux/clk.h>6#include <linux/cpufreq.h>7#include <linux/cpu_cooling.h>8#include <linux/delay.h>9#include <linux/interrupt.h>10#include <linux/io.h>11#include <linux/mfd/syscon.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/platform_device.h>15#include <linux/regmap.h>16#include <linux/thermal.h>17#include <linux/nvmem-consumer.h>18#include <linux/pm_runtime.h>19 20#define REG_SET 0x421#define REG_CLR 0x822#define REG_TOG 0xc23 24/* i.MX6 specific */25#define IMX6_MISC0 0x015026#define IMX6_MISC0_REFTOP_SELBIASOFF (1 << 3)27#define IMX6_MISC1 0x016028#define IMX6_MISC1_IRQ_TEMPHIGH (1 << 29)29/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */30#define IMX6_MISC1_IRQ_TEMPLOW (1 << 28)31#define IMX6_MISC1_IRQ_TEMPPANIC (1 << 27)32 33#define IMX6_TEMPSENSE0 0x018034#define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT 2035#define IMX6_TEMPSENSE0_ALARM_VALUE_MASK (0xfff << 20)36#define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT 837#define IMX6_TEMPSENSE0_TEMP_CNT_MASK (0xfff << 8)38#define IMX6_TEMPSENSE0_FINISHED (1 << 2)39#define IMX6_TEMPSENSE0_MEASURE_TEMP (1 << 1)40#define IMX6_TEMPSENSE0_POWER_DOWN (1 << 0)41 42#define IMX6_TEMPSENSE1 0x019043#define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff44#define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 045 46#define OCOTP_MEM0 0x048047#define OCOTP_ANA1 0x04e048 49/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */50#define IMX6_TEMPSENSE2 0x029051#define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT 052#define IMX6_TEMPSENSE2_LOW_VALUE_MASK 0xfff53#define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT 1654#define IMX6_TEMPSENSE2_PANIC_VALUE_MASK 0xfff000055 56/* i.MX7 specific */57#define IMX7_ANADIG_DIGPROG 0x80058#define IMX7_TEMPSENSE0 0x30059#define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT 1860#define IMX7_TEMPSENSE0_PANIC_ALARM_MASK (0x1ff << 18)61#define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT 962#define IMX7_TEMPSENSE0_HIGH_ALARM_MASK (0x1ff << 9)63#define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT 064#define IMX7_TEMPSENSE0_LOW_ALARM_MASK 0x1ff65 66#define IMX7_TEMPSENSE1 0x31067#define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT 1668#define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK (0xffff << 16)69#define IMX7_TEMPSENSE1_FINISHED (1 << 11)70#define IMX7_TEMPSENSE1_MEASURE_TEMP (1 << 10)71#define IMX7_TEMPSENSE1_POWER_DOWN (1 << 9)72#define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT 073#define IMX7_TEMPSENSE1_TEMP_VALUE_MASK 0x1ff74 75/* The driver supports 1 passive trip point and 1 critical trip point */76enum imx_thermal_trip {77 IMX_TRIP_PASSIVE,78 IMX_TRIP_CRITICAL,79};80 81#define IMX_POLLING_DELAY 2000 /* millisecond */82#define IMX_PASSIVE_DELAY 100083 84#define TEMPMON_IMX6Q 185#define TEMPMON_IMX6SX 286#define TEMPMON_IMX7D 387 88struct thermal_soc_data {89 u32 version;90 91 u32 sensor_ctrl;92 u32 power_down_mask;93 u32 measure_temp_mask;94 95 u32 measure_freq_ctrl;96 u32 measure_freq_mask;97 u32 measure_freq_shift;98 99 u32 temp_data;100 u32 temp_value_mask;101 u32 temp_value_shift;102 u32 temp_valid_mask;103 104 u32 panic_alarm_ctrl;105 u32 panic_alarm_mask;106 u32 panic_alarm_shift;107 108 u32 high_alarm_ctrl;109 u32 high_alarm_mask;110 u32 high_alarm_shift;111 112 u32 low_alarm_ctrl;113 u32 low_alarm_mask;114 u32 low_alarm_shift;115};116 117static struct thermal_trip trips[] = {118 [IMX_TRIP_PASSIVE] = { .type = THERMAL_TRIP_PASSIVE,119 .flags = THERMAL_TRIP_FLAG_RW_TEMP },120 [IMX_TRIP_CRITICAL] = { .type = THERMAL_TRIP_CRITICAL },121};122 123static struct thermal_soc_data thermal_imx6q_data = {124 .version = TEMPMON_IMX6Q,125 126 .sensor_ctrl = IMX6_TEMPSENSE0,127 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,128 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,129 130 .measure_freq_ctrl = IMX6_TEMPSENSE1,131 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,132 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,133 134 .temp_data = IMX6_TEMPSENSE0,135 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,136 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,137 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,138 139 .high_alarm_ctrl = IMX6_TEMPSENSE0,140 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,141 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,142};143 144static struct thermal_soc_data thermal_imx6sx_data = {145 .version = TEMPMON_IMX6SX,146 147 .sensor_ctrl = IMX6_TEMPSENSE0,148 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,149 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,150 151 .measure_freq_ctrl = IMX6_TEMPSENSE1,152 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,153 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,154 155 .temp_data = IMX6_TEMPSENSE0,156 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,157 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,158 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,159 160 .high_alarm_ctrl = IMX6_TEMPSENSE0,161 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,162 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,163 164 .panic_alarm_ctrl = IMX6_TEMPSENSE2,165 .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,166 .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,167 168 .low_alarm_ctrl = IMX6_TEMPSENSE2,169 .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,170 .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,171};172 173static struct thermal_soc_data thermal_imx7d_data = {174 .version = TEMPMON_IMX7D,175 176 .sensor_ctrl = IMX7_TEMPSENSE1,177 .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,178 .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,179 180 .measure_freq_ctrl = IMX7_TEMPSENSE1,181 .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,182 .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,183 184 .temp_data = IMX7_TEMPSENSE1,185 .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,186 .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,187 .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,188 189 .panic_alarm_ctrl = IMX7_TEMPSENSE1,190 .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,191 .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,192 193 .high_alarm_ctrl = IMX7_TEMPSENSE0,194 .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,195 .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,196 197 .low_alarm_ctrl = IMX7_TEMPSENSE0,198 .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,199 .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,200};201 202struct imx_thermal_data {203 struct device *dev;204 struct cpufreq_policy *policy;205 struct thermal_zone_device *tz;206 struct thermal_cooling_device *cdev;207 struct regmap *tempmon;208 u32 c1, c2; /* See formula in imx_init_calib() */209 int temp_max;210 int alarm_temp;211 int last_temp;212 bool irq_enabled;213 int irq;214 struct clk *thermal_clk;215 const struct thermal_soc_data *socdata;216 const char *temp_grade;217};218 219static void imx_set_panic_temp(struct imx_thermal_data *data,220 int panic_temp)221{222 const struct thermal_soc_data *soc_data = data->socdata;223 struct regmap *map = data->tempmon;224 int critical_value;225 226 critical_value = (data->c2 - panic_temp) / data->c1;227 228 regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,229 soc_data->panic_alarm_mask);230 regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,231 critical_value << soc_data->panic_alarm_shift);232}233 234static void imx_set_alarm_temp(struct imx_thermal_data *data,235 int alarm_temp)236{237 struct regmap *map = data->tempmon;238 const struct thermal_soc_data *soc_data = data->socdata;239 int alarm_value;240 241 data->alarm_temp = alarm_temp;242 243 if (data->socdata->version == TEMPMON_IMX7D)244 alarm_value = alarm_temp / 1000 + data->c1 - 25;245 else246 alarm_value = (data->c2 - alarm_temp) / data->c1;247 248 regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,249 soc_data->high_alarm_mask);250 regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,251 alarm_value << soc_data->high_alarm_shift);252}253 254static int imx_get_temp(struct thermal_zone_device *tz, int *temp)255{256 struct imx_thermal_data *data = thermal_zone_device_priv(tz);257 const struct thermal_soc_data *soc_data = data->socdata;258 struct regmap *map = data->tempmon;259 unsigned int n_meas;260 u32 val;261 int ret;262 263 ret = pm_runtime_resume_and_get(data->dev);264 if (ret < 0)265 return ret;266 267 regmap_read(map, soc_data->temp_data, &val);268 269 if ((val & soc_data->temp_valid_mask) == 0)270 return -EAGAIN;271 272 n_meas = (val & soc_data->temp_value_mask)273 >> soc_data->temp_value_shift;274 275 /* See imx_init_calib() for formula derivation */276 if (data->socdata->version == TEMPMON_IMX7D)277 *temp = (n_meas - data->c1 + 25) * 1000;278 else279 *temp = data->c2 - n_meas * data->c1;280 281 /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */282 if (data->socdata->version == TEMPMON_IMX6Q) {283 if (data->alarm_temp == trips[IMX_TRIP_PASSIVE].temperature &&284 *temp >= trips[IMX_TRIP_PASSIVE].temperature)285 imx_set_alarm_temp(data, trips[IMX_TRIP_CRITICAL].temperature);286 if (data->alarm_temp == trips[IMX_TRIP_CRITICAL].temperature &&287 *temp < trips[IMX_TRIP_PASSIVE].temperature) {288 imx_set_alarm_temp(data, trips[IMX_TRIP_PASSIVE].temperature);289 dev_dbg(data->dev, "thermal alarm off: T < %d\n",290 data->alarm_temp / 1000);291 }292 }293 294 if (*temp != data->last_temp) {295 dev_dbg(data->dev, "millicelsius: %d\n", *temp);296 data->last_temp = *temp;297 }298 299 /* Reenable alarm IRQ if temperature below alarm temperature */300 if (!data->irq_enabled && *temp < data->alarm_temp) {301 data->irq_enabled = true;302 enable_irq(data->irq);303 }304 305 pm_runtime_put(data->dev);306 307 return 0;308}309 310static int imx_change_mode(struct thermal_zone_device *tz,311 enum thermal_device_mode mode)312{313 struct imx_thermal_data *data = thermal_zone_device_priv(tz);314 315 if (mode == THERMAL_DEVICE_ENABLED) {316 pm_runtime_get(data->dev);317 318 if (!data->irq_enabled) {319 data->irq_enabled = true;320 enable_irq(data->irq);321 }322 } else {323 pm_runtime_put(data->dev);324 325 if (data->irq_enabled) {326 disable_irq(data->irq);327 data->irq_enabled = false;328 }329 }330 331 return 0;332}333 334static int imx_set_trip_temp(struct thermal_zone_device *tz,335 const struct thermal_trip *trip, int temp)336{337 struct imx_thermal_data *data = thermal_zone_device_priv(tz);338 int ret;339 340 ret = pm_runtime_resume_and_get(data->dev);341 if (ret < 0)342 return ret;343 344 /* do not allow passive to be set higher than critical */345 if (temp < 0 || temp > trips[IMX_TRIP_CRITICAL].temperature)346 return -EINVAL;347 348 imx_set_alarm_temp(data, temp);349 trips[IMX_TRIP_PASSIVE].temperature = temp;350 351 pm_runtime_put(data->dev);352 353 return 0;354}355 356static bool imx_should_bind(struct thermal_zone_device *tz,357 const struct thermal_trip *trip,358 struct thermal_cooling_device *cdev,359 struct cooling_spec *c)360{361 return trip->type == THERMAL_TRIP_PASSIVE;362}363 364static struct thermal_zone_device_ops imx_tz_ops = {365 .should_bind = imx_should_bind,366 .get_temp = imx_get_temp,367 .change_mode = imx_change_mode,368 .set_trip_temp = imx_set_trip_temp,369};370 371static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)372{373 struct imx_thermal_data *data = platform_get_drvdata(pdev);374 int n1;375 u64 temp64;376 377 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {378 dev_err(&pdev->dev, "invalid sensor calibration data\n");379 return -EINVAL;380 }381 382 /*383 * On i.MX7D, we only use the calibration data at 25C to get the temp,384 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.385 */386 if (data->socdata->version == TEMPMON_IMX7D) {387 data->c1 = (ocotp_ana1 >> 9) & 0x1ff;388 return 0;389 }390 391 /*392 * The sensor is calibrated at 25 °C (aka T1) and the value measured393 * (aka N1) at this temperature is provided in bits [31:20] in the394 * i.MX's OCOTP value ANA1.395 * To find the actual temperature T, the following formula has to be used396 * when reading value n from the sensor:397 *398 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C399 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C400 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C401 * = c2 - c1 * N402 *403 * with404 *405 * T1' = 28.580661 °C406 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C407 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C408 * = T1' + N1 * c1409 */410 n1 = ocotp_ana1 >> 20;411 412 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */413 temp64 *= 1000; /* to get result in °mC */414 do_div(temp64, 15423 * n1 - 4148468);415 data->c1 = temp64;416 data->c2 = n1 * data->c1 + 28581;417 418 return 0;419}420 421static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)422{423 struct imx_thermal_data *data = platform_get_drvdata(pdev);424 425 /* The maximum die temp is specified by the Temperature Grade */426 switch ((ocotp_mem0 >> 6) & 0x3) {427 case 0: /* Commercial (0 to 95 °C) */428 data->temp_grade = "Commercial";429 data->temp_max = 95000;430 break;431 case 1: /* Extended Commercial (-20 °C to 105 °C) */432 data->temp_grade = "Extended Commercial";433 data->temp_max = 105000;434 break;435 case 2: /* Industrial (-40 °C to 105 °C) */436 data->temp_grade = "Industrial";437 data->temp_max = 105000;438 break;439 case 3: /* Automotive (-40 °C to 125 °C) */440 data->temp_grade = "Automotive";441 data->temp_max = 125000;442 break;443 }444 445 /*446 * Set the critical trip point at 5 °C under max447 * Set the passive trip point at 10 °C under max (changeable via sysfs)448 */449 trips[IMX_TRIP_PASSIVE].temperature = data->temp_max - (1000 * 10);450 trips[IMX_TRIP_CRITICAL].temperature = data->temp_max - (1000 * 5);451}452 453static int imx_init_from_tempmon_data(struct platform_device *pdev)454{455 struct regmap *map;456 int ret;457 u32 val;458 459 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,460 "fsl,tempmon-data");461 if (IS_ERR(map)) {462 ret = PTR_ERR(map);463 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);464 return ret;465 }466 467 ret = regmap_read(map, OCOTP_ANA1, &val);468 if (ret) {469 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);470 return ret;471 }472 ret = imx_init_calib(pdev, val);473 if (ret)474 return ret;475 476 ret = regmap_read(map, OCOTP_MEM0, &val);477 if (ret) {478 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);479 return ret;480 }481 imx_init_temp_grade(pdev, val);482 483 return 0;484}485 486static int imx_init_from_nvmem_cells(struct platform_device *pdev)487{488 int ret;489 u32 val;490 491 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);492 if (ret)493 return ret;494 495 ret = imx_init_calib(pdev, val);496 if (ret)497 return ret;498 499 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);500 if (ret)501 return ret;502 imx_init_temp_grade(pdev, val);503 504 return 0;505}506 507static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)508{509 struct imx_thermal_data *data = dev;510 511 disable_irq_nosync(irq);512 data->irq_enabled = false;513 514 return IRQ_WAKE_THREAD;515}516 517static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)518{519 struct imx_thermal_data *data = dev;520 521 dev_dbg(data->dev, "THERMAL ALARM: T > %d\n", data->alarm_temp / 1000);522 523 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);524 525 return IRQ_HANDLED;526}527 528static const struct of_device_id of_imx_thermal_match[] = {529 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },530 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },531 { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },532 { /* end */ }533};534MODULE_DEVICE_TABLE(of, of_imx_thermal_match);535 536#ifdef CONFIG_CPU_FREQ537/*538 * Create cooling device in case no #cooling-cells property is available in539 * CPU node540 */541static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)542{543 struct device_node *np;544 int ret = 0;545 546 data->policy = cpufreq_cpu_get(0);547 if (!data->policy) {548 pr_debug("%s: CPUFreq policy not found\n", __func__);549 return -EPROBE_DEFER;550 }551 552 np = of_get_cpu_node(data->policy->cpu, NULL);553 554 if (!np || !of_property_present(np, "#cooling-cells")) {555 data->cdev = cpufreq_cooling_register(data->policy);556 if (IS_ERR(data->cdev)) {557 ret = PTR_ERR(data->cdev);558 cpufreq_cpu_put(data->policy);559 }560 }561 562 of_node_put(np);563 564 return ret;565}566 567static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)568{569 cpufreq_cooling_unregister(data->cdev);570 cpufreq_cpu_put(data->policy);571}572 573#else574 575static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)576{577 return 0;578}579 580static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)581{582}583#endif584 585static int imx_thermal_probe(struct platform_device *pdev)586{587 struct device *dev = &pdev->dev;588 struct imx_thermal_data *data;589 struct regmap *map;590 int measure_freq;591 int ret;592 593 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);594 if (!data)595 return -ENOMEM;596 597 data->dev = dev;598 599 map = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,tempmon");600 if (IS_ERR(map)) {601 ret = PTR_ERR(map);602 dev_err(dev, "failed to get tempmon regmap: %d\n", ret);603 return ret;604 }605 data->tempmon = map;606 607 data->socdata = of_device_get_match_data(dev);608 if (!data->socdata) {609 dev_err(dev, "no device match found\n");610 return -ENODEV;611 }612 613 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */614 if (data->socdata->version == TEMPMON_IMX6SX) {615 regmap_write(map, IMX6_MISC1 + REG_CLR,616 IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW617 | IMX6_MISC1_IRQ_TEMPPANIC);618 /*619 * reset value of LOW ALARM is incorrect, set it to lowest620 * value to avoid false trigger of low alarm.621 */622 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,623 data->socdata->low_alarm_mask);624 }625 626 data->irq = platform_get_irq(pdev, 0);627 if (data->irq < 0)628 return data->irq;629 630 platform_set_drvdata(pdev, data);631 632 if (of_property_present(dev->of_node, "nvmem-cells")) {633 ret = imx_init_from_nvmem_cells(pdev);634 if (ret)635 return dev_err_probe(dev, ret,636 "failed to init from nvmem\n");637 } else {638 ret = imx_init_from_tempmon_data(pdev);639 if (ret) {640 dev_err(dev, "failed to init from fsl,tempmon-data\n");641 return ret;642 }643 }644 645 /* Make sure sensor is in known good state for measurements */646 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,647 data->socdata->power_down_mask);648 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,649 data->socdata->measure_temp_mask);650 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,651 data->socdata->measure_freq_mask);652 if (data->socdata->version != TEMPMON_IMX7D)653 regmap_write(map, IMX6_MISC0 + REG_SET,654 IMX6_MISC0_REFTOP_SELBIASOFF);655 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,656 data->socdata->power_down_mask);657 658 ret = imx_thermal_register_legacy_cooling(data);659 if (ret)660 return dev_err_probe(dev, ret,661 "failed to register cpufreq cooling device\n");662 663 data->thermal_clk = devm_clk_get(dev, NULL);664 if (IS_ERR(data->thermal_clk)) {665 ret = dev_err_probe(dev, PTR_ERR(data->thermal_clk), "failed to get thermal clk\n");666 goto legacy_cleanup;667 }668 669 /*670 * Thermal sensor needs clk on to get correct value, normally671 * we should enable its clk before taking measurement and disable672 * clk after measurement is done, but if alarm function is enabled,673 * hardware will auto measure the temperature periodically, so we674 * need to keep the clk always on for alarm function.675 */676 ret = clk_prepare_enable(data->thermal_clk);677 if (ret) {678 dev_err(dev, "failed to enable thermal clk: %d\n", ret);679 goto legacy_cleanup;680 }681 682 data->tz = thermal_zone_device_register_with_trips("imx_thermal_zone",683 trips,684 ARRAY_SIZE(trips),685 data,686 &imx_tz_ops, NULL,687 IMX_PASSIVE_DELAY,688 IMX_POLLING_DELAY);689 if (IS_ERR(data->tz)) {690 ret = PTR_ERR(data->tz);691 dev_err(dev, "failed to register thermal zone device %d\n",692 ret);693 goto clk_disable;694 }695 696 dev_info(dev, "%s CPU temperature grade - max:%dC"697 " critical:%dC passive:%dC\n", data->temp_grade,698 data->temp_max / 1000, trips[IMX_TRIP_CRITICAL].temperature / 1000,699 trips[IMX_TRIP_PASSIVE].temperature / 1000);700 701 /* Enable measurements at ~ 10 Hz */702 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,703 data->socdata->measure_freq_mask);704 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */705 regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,706 measure_freq << data->socdata->measure_freq_shift);707 imx_set_alarm_temp(data, trips[IMX_TRIP_PASSIVE].temperature);708 709 if (data->socdata->version == TEMPMON_IMX6SX)710 imx_set_panic_temp(data, trips[IMX_TRIP_CRITICAL].temperature);711 712 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,713 data->socdata->power_down_mask);714 regmap_write(map, data->socdata->sensor_ctrl + REG_SET,715 data->socdata->measure_temp_mask);716 /* After power up, we need a delay before first access can be done. */717 usleep_range(20, 50);718 719 /* the core was configured and enabled just before */720 pm_runtime_set_active(dev);721 pm_runtime_enable(data->dev);722 723 ret = pm_runtime_resume_and_get(data->dev);724 if (ret < 0)725 goto disable_runtime_pm;726 727 data->irq_enabled = true;728 ret = thermal_zone_device_enable(data->tz);729 if (ret)730 goto thermal_zone_unregister;731 732 ret = devm_request_threaded_irq(dev, data->irq,733 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,734 0, "imx_thermal", data);735 if (ret < 0) {736 dev_err(dev, "failed to request alarm irq: %d\n", ret);737 goto thermal_zone_unregister;738 }739 740 pm_runtime_put(data->dev);741 742 return 0;743 744thermal_zone_unregister:745 thermal_zone_device_unregister(data->tz);746disable_runtime_pm:747 pm_runtime_put_noidle(data->dev);748 pm_runtime_disable(data->dev);749clk_disable:750 clk_disable_unprepare(data->thermal_clk);751legacy_cleanup:752 imx_thermal_unregister_legacy_cooling(data);753 754 return ret;755}756 757static void imx_thermal_remove(struct platform_device *pdev)758{759 struct imx_thermal_data *data = platform_get_drvdata(pdev);760 761 pm_runtime_put_noidle(data->dev);762 pm_runtime_disable(data->dev);763 764 thermal_zone_device_unregister(data->tz);765 imx_thermal_unregister_legacy_cooling(data);766}767 768static int imx_thermal_suspend(struct device *dev)769{770 struct imx_thermal_data *data = dev_get_drvdata(dev);771 int ret;772 773 /*774 * Need to disable thermal sensor, otherwise, when thermal core775 * try to get temperature before thermal sensor resume, a wrong776 * temperature will be read as the thermal sensor is powered777 * down. This is done in change_mode() operation called from778 * thermal_zone_device_disable()779 */780 ret = thermal_zone_device_disable(data->tz);781 if (ret)782 return ret;783 784 return pm_runtime_force_suspend(data->dev);785}786 787static int imx_thermal_resume(struct device *dev)788{789 struct imx_thermal_data *data = dev_get_drvdata(dev);790 int ret;791 792 ret = pm_runtime_force_resume(data->dev);793 if (ret)794 return ret;795 /* Enabled thermal sensor after resume */796 return thermal_zone_device_enable(data->tz);797}798 799static int imx_thermal_runtime_suspend(struct device *dev)800{801 struct imx_thermal_data *data = dev_get_drvdata(dev);802 const struct thermal_soc_data *socdata = data->socdata;803 struct regmap *map = data->tempmon;804 int ret;805 806 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,807 socdata->measure_temp_mask);808 if (ret)809 return ret;810 811 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,812 socdata->power_down_mask);813 if (ret)814 return ret;815 816 clk_disable_unprepare(data->thermal_clk);817 818 return 0;819}820 821static int imx_thermal_runtime_resume(struct device *dev)822{823 struct imx_thermal_data *data = dev_get_drvdata(dev);824 const struct thermal_soc_data *socdata = data->socdata;825 struct regmap *map = data->tempmon;826 int ret;827 828 ret = clk_prepare_enable(data->thermal_clk);829 if (ret)830 return ret;831 832 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR,833 socdata->power_down_mask);834 if (ret)835 return ret;836 837 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET,838 socdata->measure_temp_mask);839 if (ret)840 return ret;841 842 /*843 * According to the temp sensor designers, it may require up to ~17us844 * to complete a measurement.845 */846 usleep_range(20, 50);847 848 return 0;849}850 851static const struct dev_pm_ops imx_thermal_pm_ops = {852 SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume)853 RUNTIME_PM_OPS(imx_thermal_runtime_suspend,854 imx_thermal_runtime_resume, NULL)855};856 857static struct platform_driver imx_thermal = {858 .driver = {859 .name = "imx_thermal",860 .pm = pm_ptr(&imx_thermal_pm_ops),861 .of_match_table = of_imx_thermal_match,862 },863 .probe = imx_thermal_probe,864 .remove_new = imx_thermal_remove,865};866module_platform_driver(imx_thermal);867 868MODULE_AUTHOR("Freescale Semiconductor, Inc.");869MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");870MODULE_LICENSE("GPL v2");871MODULE_ALIAS("platform:imx-thermal");872