drivers/thermal/imx_thermal.c

   1 /*
   2  * Copyright 2013 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/cpufreq.h>
  12 #include <linux/cpu_cooling.h>
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/init.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mfd/syscon.h>
  20 #include <linux/module.h>
  21 #include <linux/of.h>
  22 #include <linux/of_device.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/regmap.h>
  25 #include <linux/slab.h>
  26 #include <linux/thermal.h>
  27 #include <linux/types.h>
  28 #include <linux/nvmem-consumer.h>
  29
  30 #define REG_SET         0x4
  31 #define REG_CLR         0x8
  32 #define REG_TOG         0xc
  33
  34 #define MISC0                           0x0150
  35 #define MISC0_REFTOP_SELBIASOFF         (1 << 3)
  36 #define MISC1                           0x0160
  37 #define MISC1_IRQ_TEMPHIGH              (1 << 29)
  38 /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
  39 #define MISC1_IRQ_TEMPLOW               (1 << 28)
  40 #define MISC1_IRQ_TEMPPANIC             (1 << 27)
  41
  42 #define TEMPSENSE0                      0x0180
  43 #define TEMPSENSE0_ALARM_VALUE_SHIFT    20
  44 #define TEMPSENSE0_ALARM_VALUE_MASK     (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
  45 #define TEMPSENSE0_TEMP_CNT_SHIFT       8
  46 #define TEMPSENSE0_TEMP_CNT_MASK        (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
  47 #define TEMPSENSE0_FINISHED             (1 << 2)
  48 #define TEMPSENSE0_MEASURE_TEMP         (1 << 1)
  49 #define TEMPSENSE0_POWER_DOWN           (1 << 0)
  50
  51 #define TEMPSENSE1                      0x0190
  52 #define TEMPSENSE1_MEASURE_FREQ         0xffff
  53 /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
  54 #define TEMPSENSE2                      0x0290
  55 #define TEMPSENSE2_LOW_VALUE_SHIFT      0
  56 #define TEMPSENSE2_LOW_VALUE_MASK       0xfff
  57 #define TEMPSENSE2_PANIC_VALUE_SHIFT    16
  58 #define TEMPSENSE2_PANIC_VALUE_MASK     0xfff0000
  59
  60 #define OCOTP_MEM0                      0x0480
  61 #define OCOTP_ANA1                      0x04e0
  62
  63 /* The driver supports 1 passive trip point and 1 critical trip point */
  64 enum imx_thermal_trip {
  65         IMX_TRIP_PASSIVE,
  66         IMX_TRIP_CRITICAL,
  67         IMX_TRIP_NUM,
  68 };
  69
  70 #define IMX_POLLING_DELAY               2000 /* millisecond */
  71 #define IMX_PASSIVE_DELAY               1000
  72
  73 #define TEMPMON_IMX6Q                   1
  74 #define TEMPMON_IMX6SX                  2
  75
  76 struct thermal_soc_data {
  77         u32 version;
  78 };
  79
  80 static struct thermal_soc_data thermal_imx6q_data = {
  81         .version = TEMPMON_IMX6Q,
  82 };
  83
  84 static struct thermal_soc_data thermal_imx6sx_data = {
  85         .version = TEMPMON_IMX6SX,
  86 };
  87
  88 struct imx_thermal_data {
  89         struct cpufreq_policy *policy;
  90         struct thermal_zone_device *tz;
  91         struct thermal_cooling_device *cdev;
  92         enum thermal_device_mode mode;
  93         struct regmap *tempmon;
  94         u32 c1, c2; /* See formula in imx_init_calib() */
  95         int temp_passive;
  96         int temp_critical;
  97         int temp_max;
  98         int alarm_temp;
  99         int last_temp;
 100         bool irq_enabled;
 101         int irq;
 102         struct clk *thermal_clk;
 103         const struct thermal_soc_data *socdata;
 104         const char *temp_grade;
 105 };
 106
 107 static void imx_set_panic_temp(struct imx_thermal_data *data,
 108                                int panic_temp)
 109 {
 110         struct regmap *map = data->tempmon;
 111         int critical_value;
 112
 113         critical_value = (data->c2 - panic_temp) / data->c1;
 114         regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
 115         regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
 116                         TEMPSENSE2_PANIC_VALUE_SHIFT);
 117 }
 118
 119 static void imx_set_alarm_temp(struct imx_thermal_data *data,
 120                                int alarm_temp)
 121 {
 122         struct regmap *map = data->tempmon;
 123         int alarm_value;
 124
 125         data->alarm_temp = alarm_temp;
 126         alarm_value = (data->c2 - alarm_temp) / data->c1;
 127         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
 128         regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
 129                         TEMPSENSE0_ALARM_VALUE_SHIFT);
 130 }
 131
 132 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
 133 {
 134         struct imx_thermal_data *data = tz->devdata;
 135         struct regmap *map = data->tempmon;
 136         unsigned int n_meas;
 137         bool wait;
 138         u32 val;
 139
 140         if (data->mode == THERMAL_DEVICE_ENABLED) {
 141                 /* Check if a measurement is currently in progress */
 142                 regmap_read(map, TEMPSENSE0, &val);
 143                 wait = !(val & TEMPSENSE0_FINISHED);
 144         } else {
 145                 /*
 146                  * Every time we measure the temperature, we will power on the
 147                  * temperature sensor, enable measurements, take a reading,
 148                  * disable measurements, power off the temperature sensor.
 149                  */
 150                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 151                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 152
 153                 wait = true;
 154         }
 155
 156         /*
 157          * According to the temp sensor designers, it may require up to ~17us
 158          * to complete a measurement.
 159          */
 160         if (wait)
 161                 usleep_range(20, 50);
 162
 163         regmap_read(map, TEMPSENSE0, &val);
 164
 165         if (data->mode != THERMAL_DEVICE_ENABLED) {
 166                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 167                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 168         }
 169
 170         if ((val & TEMPSENSE0_FINISHED) == 0) {
 171                 dev_dbg(&tz->device, "temp measurement never finished\n");
 172                 return -EAGAIN;
 173         }
 174
 175         n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
 176
 177         /* See imx_init_calib() for formula derivation */
 178         *temp = data->c2 - n_meas * data->c1;
 179
 180         /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
 181         if (data->socdata->version == TEMPMON_IMX6Q) {
 182                 if (data->alarm_temp == data->temp_passive &&
 183                         *temp >= data->temp_passive)
 184                         imx_set_alarm_temp(data, data->temp_critical);
 185                 if (data->alarm_temp == data->temp_critical &&
 186                         *temp < data->temp_passive) {
 187                         imx_set_alarm_temp(data, data->temp_passive);
 188                         dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
 189                                 data->alarm_temp / 1000);
 190                 }
 191         }
 192
 193         if (*temp != data->last_temp) {
 194                 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
 195                 data->last_temp = *temp;
 196         }
 197
 198         /* Reenable alarm IRQ if temperature below alarm temperature */
 199         if (!data->irq_enabled && *temp < data->alarm_temp) {
 200                 data->irq_enabled = true;
 201                 enable_irq(data->irq);
 202         }
 203
 204         return 0;
 205 }
 206
 207 static int imx_get_mode(struct thermal_zone_device *tz,
 208                         enum thermal_device_mode *mode)
 209 {
 210         struct imx_thermal_data *data = tz->devdata;
 211
 212         *mode = data->mode;
 213
 214         return 0;
 215 }
 216
 217 static int imx_set_mode(struct thermal_zone_device *tz,
 218                         enum thermal_device_mode mode)
 219 {
 220         struct imx_thermal_data *data = tz->devdata;
 221         struct regmap *map = data->tempmon;
 222
 223         if (mode == THERMAL_DEVICE_ENABLED) {
 224                 tz->polling_delay = IMX_POLLING_DELAY;
 225                 tz->passive_delay = IMX_PASSIVE_DELAY;
 226
 227                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 228                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 229
 230                 if (!data->irq_enabled) {
 231                         data->irq_enabled = true;
 232                         enable_irq(data->irq);
 233                 }
 234         } else {
 235                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 236                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 237
 238                 tz->polling_delay = 0;
 239                 tz->passive_delay = 0;
 240
 241                 if (data->irq_enabled) {
 242                         disable_irq(data->irq);
 243                         data->irq_enabled = false;
 244                 }
 245         }
 246
 247         data->mode = mode;
 248         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 249
 250         return 0;
 251 }
 252
 253 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
 254                              enum thermal_trip_type *type)
 255 {
 256         *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
 257                                              THERMAL_TRIP_CRITICAL;
 258         return 0;
 259 }
 260
 261 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
 262 {
 263         struct imx_thermal_data *data = tz->devdata;
 264
 265         *temp = data->temp_critical;
 266         return 0;
 267 }
 268
 269 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
 270                              int *temp)
 271 {
 272         struct imx_thermal_data *data = tz->devdata;
 273
 274         *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
 275                                              data->temp_critical;
 276         return 0;
 277 }
 278
 279 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
 280                              int temp)
 281 {
 282         struct imx_thermal_data *data = tz->devdata;
 283
 284         /* do not allow changing critical threshold */
 285         if (trip == IMX_TRIP_CRITICAL)
 286                 return -EPERM;
 287
 288         /* do not allow passive to be set higher than critical */
 289         if (temp < 0 || temp > data->temp_critical)
 290                 return -EINVAL;
 291
 292         data->temp_passive = temp;
 293
 294         imx_set_alarm_temp(data, temp);
 295
 296         return 0;
 297 }
 298
 299 static int imx_bind(struct thermal_zone_device *tz,
 300                     struct thermal_cooling_device *cdev)
 301 {
 302         int ret;
 303
 304         ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
 305                                                THERMAL_NO_LIMIT,
 306                                                THERMAL_NO_LIMIT,
 307                                                THERMAL_WEIGHT_DEFAULT);
 308         if (ret) {
 309                 dev_err(&tz->device,
 310                         "binding zone %s with cdev %s failed:%d\n",
 311                         tz->type, cdev->type, ret);
 312                 return ret;
 313         }
 314
 315         return 0;
 316 }
 317
 318 static int imx_unbind(struct thermal_zone_device *tz,
 319                       struct thermal_cooling_device *cdev)
 320 {
 321         int ret;
 322
 323         ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
 324         if (ret) {
 325                 dev_err(&tz->device,
 326                         "unbinding zone %s with cdev %s failed:%d\n",
 327                         tz->type, cdev->type, ret);
 328                 return ret;
 329         }
 330
 331         return 0;
 332 }
 333
 334 static struct thermal_zone_device_ops imx_tz_ops = {
 335         .bind = imx_bind,
 336         .unbind = imx_unbind,
 337         .get_temp = imx_get_temp,
 338         .get_mode = imx_get_mode,
 339         .set_mode = imx_set_mode,
 340         .get_trip_type = imx_get_trip_type,
 341         .get_trip_temp = imx_get_trip_temp,
 342         .get_crit_temp = imx_get_crit_temp,
 343         .set_trip_temp = imx_set_trip_temp,
 344 };
 345
 346 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
 347 {
 348         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 349         int n1;
 350         u64 temp64;
 351
 352         if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
 353                 dev_err(&pdev->dev, "invalid sensor calibration data\n");
 354                 return -EINVAL;
 355         }
 356
 357         /*
 358          * The sensor is calibrated at 25 °C (aka T1) and the value measured
 359          * (aka N1) at this temperature is provided in bits [31:20] in the
 360          * i.MX's OCOTP value ANA1.
 361          * To find the actual temperature T, the following formula has to be used
 362          * when reading value n from the sensor:
 363          *
 364          * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
 365          *   = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
 366          *   = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
 367          *   = c2 - c1 * N
 368          *
 369          * with
 370          *
 371          *  T1' = 28.580661 °C
 372          *   c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
 373          *   c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
 374          *      = T1' + N1 * c1
 375          */
 376         n1 = ocotp_ana1 >> 20;
 377
 378         temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
 379         temp64 *= 1000; /* to get result in °mC */
 380         do_div(temp64, 15423 * n1 - 4148468);
 381         data->c1 = temp64;
 382         data->c2 = n1 * data->c1 + 28581;
 383
 384         return 0;
 385 }
 386
 387 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
 388 {
 389         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 390
 391         /* The maximum die temp is specified by the Temperature Grade */
 392         switch ((ocotp_mem0 >> 6) & 0x3) {
 393         case 0: /* Commercial (0 to 95 °C) */
 394                 data->temp_grade = "Commercial";
 395                 data->temp_max = 95000;
 396                 break;
 397         case 1: /* Extended Commercial (-20 °C to 105 °C) */
 398                 data->temp_grade = "Extended Commercial";
 399                 data->temp_max = 105000;
 400                 break;
 401         case 2: /* Industrial (-40 °C to 105 °C) */
 402                 data->temp_grade = "Industrial";
 403                 data->temp_max = 105000;
 404                 break;
 405         case 3: /* Automotive (-40 °C to 125 °C) */
 406                 data->temp_grade = "Automotive";
 407                 data->temp_max = 125000;
 408                 break;
 409         }
 410
 411         /*
 412          * Set the critical trip point at 5 °C under max
 413          * Set the passive trip point at 10 °C under max (changeable via sysfs)
 414          */
 415         data->temp_critical = data->temp_max - (1000 * 5);
 416         data->temp_passive = data->temp_max - (1000 * 10);
 417 }
 418
 419 static int imx_init_from_tempmon_data(struct platform_device *pdev)
 420 {
 421         struct regmap *map;
 422         int ret;
 423         u32 val;
 424
 425         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 426                                               "fsl,tempmon-data");
 427         if (IS_ERR(map)) {
 428                 ret = PTR_ERR(map);
 429                 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
 430                 return ret;
 431         }
 432
 433         ret = regmap_read(map, OCOTP_ANA1, &val);
 434         if (ret) {
 435                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 436                 return ret;
 437         }
 438         ret = imx_init_calib(pdev, val);
 439         if (ret)
 440                 return ret;
 441
 442         ret = regmap_read(map, OCOTP_MEM0, &val);
 443         if (ret) {
 444                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 445                 return ret;
 446         }
 447         imx_init_temp_grade(pdev, val);
 448
 449         return 0;
 450 }
 451
 452 static int imx_init_from_nvmem_cells(struct platform_device *pdev)
 453 {
 454         int ret;
 455         u32 val;
 456
 457         ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
 458         if (ret)
 459                 return ret;
 460         imx_init_calib(pdev, val);
 461
 462         ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
 463         if (ret)
 464                 return ret;
 465         imx_init_temp_grade(pdev, val);
 466
 467         return 0;
 468 }
 469
 470 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
 471 {
 472         struct imx_thermal_data *data = dev;
 473
 474         disable_irq_nosync(irq);
 475         data->irq_enabled = false;
 476
 477         return IRQ_WAKE_THREAD;
 478 }
 479
 480 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
 481 {
 482         struct imx_thermal_data *data = dev;
 483
 484         dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
 485                 data->alarm_temp / 1000);
 486
 487         thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
 488
 489         return IRQ_HANDLED;
 490 }
 491
 492 static const struct of_device_id of_imx_thermal_match[] = {
 493         { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
 494         { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
 495         { /* end */ }
 496 };
 497 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
 498
 499 static int imx_thermal_probe(struct platform_device *pdev)
 500 {
 501         struct imx_thermal_data *data;
 502         struct regmap *map;
 503         int measure_freq;
 504         int ret;
 505
 506         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 507         if (!data)
 508                 return -ENOMEM;
 509
 510         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
 511         if (IS_ERR(map)) {
 512                 ret = PTR_ERR(map);
 513                 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
 514                 return ret;
 515         }
 516         data->tempmon = map;
 517
 518         data->socdata = of_device_get_match_data(&pdev->dev);
 519         if (!data->socdata) {
 520                 dev_err(&pdev->dev, "no device match found\n");
 521                 return -ENODEV;
 522         }
 523
 524         /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
 525         if (data->socdata->version == TEMPMON_IMX6SX) {
 526                 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
 527                         MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
 528                 /*
 529                  * reset value of LOW ALARM is incorrect, set it to lowest
 530                  * value to avoid false trigger of low alarm.
 531                  */
 532                 regmap_write(map, TEMPSENSE2 + REG_SET,
 533                         TEMPSENSE2_LOW_VALUE_MASK);
 534         }
 535
 536         data->irq = platform_get_irq(pdev, 0);
 537         if (data->irq < 0)
 538                 return data->irq;
 539
 540         platform_set_drvdata(pdev, data);
 541
 542         if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
 543                 ret = imx_init_from_nvmem_cells(pdev);
 544                 if (ret == -EPROBE_DEFER)
 545                         return ret;
 546                 if (ret) {
 547                         dev_err(&pdev->dev, "failed to init from nvmem: %d\n",
 548                                 ret);
 549                         return ret;
 550                 }
 551         } else {
 552                 ret = imx_init_from_tempmon_data(pdev);
 553                 if (ret) {
 554                         dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n");
 555                         return ret;
 556                 }
 557         }
 558
 559         /* Make sure sensor is in known good state for measurements */
 560         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 561         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 562         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
 563         regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
 564         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 565
 566         data->policy = cpufreq_cpu_get(0);
 567         if (!data->policy) {
 568                 pr_debug("%s: CPUFreq policy not found\n", __func__);
 569                 return -EPROBE_DEFER;
 570         }
 571
 572         data->cdev = cpufreq_cooling_register(data->policy);
 573         if (IS_ERR(data->cdev)) {
 574                 ret = PTR_ERR(data->cdev);
 575                 dev_err(&pdev->dev,
 576                         "failed to register cpufreq cooling device: %d\n", ret);
 577                 cpufreq_cpu_put(data->policy);
 578                 return ret;
 579         }
 580
 581         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
 582         if (IS_ERR(data->thermal_clk)) {
 583                 ret = PTR_ERR(data->thermal_clk);
 584                 if (ret != -EPROBE_DEFER)
 585                         dev_err(&pdev->dev,
 586                                 "failed to get thermal clk: %d\n", ret);
 587                 cpufreq_cooling_unregister(data->cdev);
 588                 cpufreq_cpu_put(data->policy);
 589                 return ret;
 590         }
 591
 592         /*
 593          * Thermal sensor needs clk on to get correct value, normally
 594          * we should enable its clk before taking measurement and disable
 595          * clk after measurement is done, but if alarm function is enabled,
 596          * hardware will auto measure the temperature periodically, so we
 597          * need to keep the clk always on for alarm function.
 598          */
 599         ret = clk_prepare_enable(data->thermal_clk);
 600         if (ret) {
 601                 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
 602                 cpufreq_cooling_unregister(data->cdev);
 603                 cpufreq_cpu_put(data->policy);
 604                 return ret;
 605         }
 606
 607         data->tz = thermal_zone_device_register("imx_thermal_zone",
 608                                                 IMX_TRIP_NUM,
 609                                                 BIT(IMX_TRIP_PASSIVE), data,
 610                                                 &imx_tz_ops, NULL,
 611                                                 IMX_PASSIVE_DELAY,
 612                                                 IMX_POLLING_DELAY);
 613         if (IS_ERR(data->tz)) {
 614                 ret = PTR_ERR(data->tz);
 615                 dev_err(&pdev->dev,
 616                         "failed to register thermal zone device %d\n", ret);
 617                 clk_disable_unprepare(data->thermal_clk);
 618                 cpufreq_cooling_unregister(data->cdev);
 619                 cpufreq_cpu_put(data->policy);
 620                 return ret;
 621         }
 622
 623         dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
 624                  " critical:%dC passive:%dC\n", data->temp_grade,
 625                  data->temp_max / 1000, data->temp_critical / 1000,
 626                  data->temp_passive / 1000);
 627
 628         /* Enable measurements at ~ 10 Hz */
 629         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
 630         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
 631         regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
 632         imx_set_alarm_temp(data, data->temp_passive);
 633
 634         if (data->socdata->version == TEMPMON_IMX6SX)
 635                 imx_set_panic_temp(data, data->temp_critical);
 636
 637         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 638         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 639
 640         data->irq_enabled = true;
 641         data->mode = THERMAL_DEVICE_ENABLED;
 642
 643         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
 644                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
 645                         0, "imx_thermal", data);
 646         if (ret < 0) {
 647                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
 648                 clk_disable_unprepare(data->thermal_clk);
 649                 thermal_zone_device_unregister(data->tz);
 650                 cpufreq_cooling_unregister(data->cdev);
 651                 cpufreq_cpu_put(data->policy);
 652                 return ret;
 653         }
 654
 655         return 0;
 656 }
 657
 658 static int imx_thermal_remove(struct platform_device *pdev)
 659 {
 660         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 661         struct regmap *map = data->tempmon;
 662
 663         /* Disable measurements */
 664         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 665         if (!IS_ERR(data->thermal_clk))
 666                 clk_disable_unprepare(data->thermal_clk);
 667
 668         thermal_zone_device_unregister(data->tz);
 669         cpufreq_cooling_unregister(data->cdev);
 670         cpufreq_cpu_put(data->policy);
 671
 672         return 0;
 673 }
 674
 675 #ifdef CONFIG_PM_SLEEP
 676 static int imx_thermal_suspend(struct device *dev)
 677 {
 678         struct imx_thermal_data *data = dev_get_drvdata(dev);
 679         struct regmap *map = data->tempmon;
 680
 681         /*
 682          * Need to disable thermal sensor, otherwise, when thermal core
 683          * try to get temperature before thermal sensor resume, a wrong
 684          * temperature will be read as the thermal sensor is powered
 685          * down.
 686          */
 687         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 688         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 689         data->mode = THERMAL_DEVICE_DISABLED;
 690         clk_disable_unprepare(data->thermal_clk);
 691
 692         return 0;
 693 }
 694
 695 static int imx_thermal_resume(struct device *dev)
 696 {
 697         struct imx_thermal_data *data = dev_get_drvdata(dev);
 698         struct regmap *map = data->tempmon;
 699         int ret;
 700
 701         ret = clk_prepare_enable(data->thermal_clk);
 702         if (ret)
 703                 return ret;
 704         /* Enabled thermal sensor after resume */
 705         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 706         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 707         data->mode = THERMAL_DEVICE_ENABLED;
 708
 709         return 0;
 710 }
 711 #endif
 712
 713 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
 714                          imx_thermal_suspend, imx_thermal_resume);
 715
 716 static struct platform_driver imx_thermal = {
 717         .driver = {
 718                 .name   = "imx_thermal",
 719                 .pm     = &imx_thermal_pm_ops,
 720                 .of_match_table = of_imx_thermal_match,
 721         },
 722         .probe          = imx_thermal_probe,
 723         .remove         = imx_thermal_remove,
 724 };
 725 module_platform_driver(imx_thermal);
 726
 727 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 728 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
 729 MODULE_LICENSE("GPL v2");
 730 MODULE_ALIAS("platform:imx-thermal");