drivers/thermal/imx_thermal.c

   1 /*
   2  * Copyright 2013-2014 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/cpu_cooling.h>
  12 #include <linux/cpufreq.h>
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/device_cooling.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/kernel.h>
  20 #include <linux/mfd/syscon.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/regmap.h>
  26 #include <linux/slab.h>
  27 #include <linux/thermal.h>
  28 #include <linux/types.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 #define MISC1_IRQ_TEMPLOW               (1 << 28)
  39 #define MISC1_IRQ_TEMPPANIC             (1 << 27)
  40
  41 #define TEMPSENSE0                      0x0180
  42 #define TEMPSENSE0_ALARM_VALUE_SHIFT    20
  43 #define TEMPSENSE0_ALARM_VALUE_MASK     (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
  44 #define TEMPSENSE0_TEMP_CNT_SHIFT       8
  45 #define TEMPSENSE0_TEMP_CNT_MASK        (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
  46 #define TEMPSENSE0_FINISHED             (1 << 2)
  47 #define TEMPSENSE0_MEASURE_TEMP         (1 << 1)
  48 #define TEMPSENSE0_POWER_DOWN           (1 << 0)
  49
  50 #define TEMPSENSE1                      0x0190
  51 #define TEMPSENSE1_MEASURE_FREQ         0xffff
  52 #define TEMPSENSE2                      0x0290
  53 #define TEMPSENSE2_LOW_VALUE_SHIFT      0
  54 #define TEMPSENSE2_LOW_VALUE_MASK       0xfff
  55 #define TEMPSENSE2_PANIC_VALUE_SHIFT    16
  56 #define TEMPSENSE2_PANIC_VALUE_MASK     0xfff0000
  57
  58 #define OCOTP_ANA1                      0x04e0
  59
  60 /* The driver supports 1 passive trip point and 1 critical trip point */
  61 enum imx_thermal_trip {
  62         IMX_TRIP_PASSIVE,
  63         IMX_TRIP_CRITICAL,
  64         IMX_TRIP_NUM,
  65 };
  66
  67 /*
  68  * It defines the temperature in millicelsius for passive trip point
  69  * that will trigger cooling action when crossed.
  70  */
  71 #define IMX_TEMP_PASSIVE                85000
  72 #define IMX_TEMP_PASSIVE_COOL_DELTA     10000
  73
  74 #define IMX_POLLING_DELAY               2000 /* millisecond */
  75 #define IMX_PASSIVE_DELAY               1000
  76
  77 #define FACTOR0                         10000000
  78 #define FACTOR1                         15976
  79 #define FACTOR2                         4297157
  80
  81 #define TEMPMON_V1                      1
  82 #define TEMPMON_V2                      2
  83
  84 struct thermal_soc_data {
  85         u32 version;
  86 };
  87
  88 static struct thermal_soc_data thermal_imx6q_data = {
  89         .version = TEMPMON_V1,
  90 };
  91
  92 static struct thermal_soc_data thermal_imx6sx_data = {
  93         .version = TEMPMON_V2,
  94 };
  95
  96 struct imx_thermal_data {
  97         struct thermal_zone_device *tz;
  98         struct thermal_cooling_device *cdev[2];
  99         enum thermal_device_mode mode;
 100         struct regmap *tempmon;
 101         u32 c1, c2; /* See formula in imx_get_sensor_data() */
 102         unsigned long temp_passive;
 103         unsigned long temp_critical;
 104         unsigned long alarm_temp;
 105         unsigned long last_temp;
 106         bool irq_enabled;
 107         int irq;
 108         struct clk *thermal_clk;
 109         const struct thermal_soc_data *socdata;
 110 };
 111
 112 static void imx_set_panic_temp(struct imx_thermal_data *data,
 113                                signed long panic_temp)
 114 {
 115         struct regmap *map = data->tempmon;
 116         int critical_value;
 117
 118         critical_value = (data->c2 - panic_temp) / data->c1;
 119         regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
 120         regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
 121                         TEMPSENSE2_PANIC_VALUE_SHIFT);
 122 }
 123
 124 static void imx_set_alarm_temp(struct imx_thermal_data *data,
 125                                signed long alarm_temp)
 126 {
 127         struct regmap *map = data->tempmon;
 128         int alarm_value;
 129
 130         data->alarm_temp = alarm_temp;
 131         alarm_value = (data->c2 - alarm_temp) / data->c1;
 132         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
 133         regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
 134                         TEMPSENSE0_ALARM_VALUE_SHIFT);
 135 }
 136
 137 static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
 138 {
 139         struct imx_thermal_data *data = tz->devdata;
 140         struct regmap *map = data->tempmon;
 141         unsigned int n_meas;
 142         bool wait;
 143         u32 val;
 144
 145         if (data->mode == THERMAL_DEVICE_ENABLED) {
 146                 /* Check if a measurement is currently in progress */
 147                 regmap_read(map, TEMPSENSE0, &val);
 148                 wait = !(val & TEMPSENSE0_FINISHED);
 149         } else {
 150                 /*
 151                  * Every time we measure the temperature, we will power on the
 152                  * temperature sensor, enable measurements, take a reading,
 153                  * disable measurements, power off the temperature sensor.
 154                  */
 155                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 156                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 157
 158                 wait = true;
 159         }
 160
 161         /*
 162          * According to the temp sensor designers, it may require up to ~17us
 163          * to complete a measurement.
 164          */
 165         if (wait)
 166                 usleep_range(20, 50);
 167
 168         regmap_read(map, TEMPSENSE0, &val);
 169
 170         if (data->mode != THERMAL_DEVICE_ENABLED) {
 171                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 172                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 173         }
 174
 175         if ((val & TEMPSENSE0_FINISHED) == 0) {
 176                 dev_dbg(&tz->device, "temp measurement never finished\n");
 177                 return -EAGAIN;
 178         }
 179
 180         n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
 181
 182         /* See imx_get_sensor_data() for formula derivation */
 183         *temp = data->c2 - n_meas * data->c1;
 184
 185         /* Update alarm value to next higher trip point */
 186         if (data->alarm_temp == data->temp_passive && *temp >= data->temp_passive)
 187                 imx_set_alarm_temp(data, data->temp_critical);
 188         if (data->alarm_temp == data->temp_critical && *temp < data->temp_passive) {
 189                 imx_set_alarm_temp(data, data->temp_passive);
 190                 dev_dbg(&tz->device, "thermal alarm off: T < %lu\n",
 191                         data->alarm_temp / 1000);
 192         }
 193
 194         if (*temp != data->last_temp) {
 195                 dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
 196                 data->last_temp = *temp;
 197         }
 198
 199         /* Reenable alarm IRQ if temperature below alarm temperature */
 200         if (!data->irq_enabled && *temp < data->alarm_temp) {
 201                 data->irq_enabled = true;
 202                 enable_irq(data->irq);
 203         }
 204
 205         return 0;
 206 }
 207
 208 static int imx_get_mode(struct thermal_zone_device *tz,
 209                         enum thermal_device_mode *mode)
 210 {
 211         struct imx_thermal_data *data = tz->devdata;
 212
 213         *mode = data->mode;
 214
 215         return 0;
 216 }
 217
 218 static int imx_set_mode(struct thermal_zone_device *tz,
 219                         enum thermal_device_mode mode)
 220 {
 221         struct imx_thermal_data *data = tz->devdata;
 222         struct regmap *map = data->tempmon;
 223
 224         if (mode == THERMAL_DEVICE_ENABLED) {
 225                 tz->polling_delay = IMX_POLLING_DELAY;
 226                 tz->passive_delay = IMX_PASSIVE_DELAY;
 227
 228                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 229                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 230
 231                 if (!data->irq_enabled) {
 232                         data->irq_enabled = true;
 233                         enable_irq(data->irq);
 234                 }
 235         } else {
 236                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 237                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 238
 239                 tz->polling_delay = 0;
 240                 tz->passive_delay = 0;
 241
 242                 if (data->irq_enabled) {
 243                         disable_irq(data->irq);
 244                         data->irq_enabled = false;
 245                 }
 246         }
 247
 248         data->mode = mode;
 249         thermal_zone_device_update(tz);
 250
 251         return 0;
 252 }
 253
 254 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
 255                              enum thermal_trip_type *type)
 256 {
 257         *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
 258                                              THERMAL_TRIP_CRITICAL;
 259         return 0;
 260 }
 261
 262 static int imx_get_crit_temp(struct thermal_zone_device *tz,
 263                              unsigned long *temp)
 264 {
 265         struct imx_thermal_data *data = tz->devdata;
 266
 267         *temp = data->temp_critical;
 268         return 0;
 269 }
 270
 271 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
 272                              unsigned long *temp)
 273 {
 274         struct imx_thermal_data *data = tz->devdata;
 275
 276         *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
 277                                              data->temp_critical;
 278         return 0;
 279 }
 280
 281 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
 282                              unsigned long temp)
 283 {
 284         struct imx_thermal_data *data = tz->devdata;
 285
 286         if (temp > IMX_TEMP_PASSIVE)
 287                 return -EINVAL;
 288
 289         if (trip == IMX_TRIP_CRITICAL) {
 290                 data->temp_critical = temp;
 291                 if (data->socdata->version == TEMPMON_V2)
 292                         imx_set_panic_temp(data, temp);
 293         }
 294
 295         if (trip == IMX_TRIP_PASSIVE) {
 296                 data->temp_passive = temp;
 297                 imx_set_alarm_temp(data, temp);
 298         }
 299
 300         return 0;
 301 }
 302
 303 static int imx_get_trend(struct thermal_zone_device *tz,
 304         int trip, enum thermal_trend *trend)
 305 {
 306         int ret;
 307         unsigned long trip_temp;
 308
 309         ret = imx_get_trip_temp(tz, trip, &trip_temp);
 310         if (ret < 0)
 311                 return ret;
 312
 313         if (tz->temperature >= (trip_temp - IMX_TEMP_PASSIVE_COOL_DELTA))
 314                 *trend = THERMAL_TREND_RAISE_FULL;
 315         else
 316                 *trend = THERMAL_TREND_DROP_FULL;
 317
 318         return 0;
 319 }
 320
 321 static int imx_bind(struct thermal_zone_device *tz,
 322                     struct thermal_cooling_device *cdev)
 323 {
 324         int ret;
 325
 326         ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
 327                                                THERMAL_NO_LIMIT,
 328                                                THERMAL_NO_LIMIT);
 329         if (ret) {
 330                 dev_err(&tz->device,
 331                         "binding zone %s with cdev %s failed:%d\n",
 332                         tz->type, cdev->type, ret);
 333                 return ret;
 334         }
 335
 336         return 0;
 337 }
 338
 339 static int imx_unbind(struct thermal_zone_device *tz,
 340                       struct thermal_cooling_device *cdev)
 341 {
 342         int ret;
 343
 344         ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
 345         if (ret) {
 346                 dev_err(&tz->device,
 347                         "unbinding zone %s with cdev %s failed:%d\n",
 348                         tz->type, cdev->type, ret);
 349                 return ret;
 350         }
 351
 352         return 0;
 353 }
 354
 355 static struct thermal_zone_device_ops imx_tz_ops = {
 356         .bind = imx_bind,
 357         .unbind = imx_unbind,
 358         .get_temp = imx_get_temp,
 359         .get_mode = imx_get_mode,
 360         .set_mode = imx_set_mode,
 361         .get_trip_type = imx_get_trip_type,
 362         .get_trip_temp = imx_get_trip_temp,
 363         .get_crit_temp = imx_get_crit_temp,
 364         .set_trip_temp = imx_set_trip_temp,
 365         .get_trend = imx_get_trend,
 366 };
 367
 368 static int imx_get_sensor_data(struct platform_device *pdev)
 369 {
 370         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 371         struct regmap *map;
 372         int t1, t2, n1, n2;
 373         int ret;
 374         u32 val;
 375         u64 temp64;
 376
 377         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 378                                               "fsl,tempmon-data");
 379         if (IS_ERR(map)) {
 380                 ret = PTR_ERR(map);
 381                 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
 382                 return ret;
 383         }
 384
 385         ret = regmap_read(map, OCOTP_ANA1, &val);
 386         if (ret) {
 387                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 388                 return ret;
 389         }
 390
 391         if (val == 0 || val == ~0) {
 392                 dev_err(&pdev->dev, "invalid sensor calibration data\n");
 393                 return -EINVAL;
 394         }
 395
 396         /*
 397          * Sensor data layout:
 398          *   [31:20] - sensor value @ 25C
 399          *    [19:8] - sensor value of hot
 400          *     [7:0] - hot temperature value
 401          * Use universal formula now and only need sensor value @ 25C
 402          * slope = 0.4297157 - (0.0015976 * 25C fuse)
 403          */
 404         n1 = val >> 20;
 405         n2 = (val & 0xfff00) >> 8;
 406         t2 = val & 0xff;
 407         t1 = 25; /* t1 always 25C */
 408
 409         /*
 410          * Derived from linear interpolation:
 411          * slope = 0.4297157 - (0.0015976 * 25C fuse)
 412          * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
 413          * (Nmeas - n1) / (Tmeas - t1) = slope
 414          * We want to reduce this down to the minimum computation necessary
 415          * for each temperature read.  Also, we want Tmeas in millicelsius
 416          * and we don't want to lose precision from integer division. So...
 417          * Tmeas = (Nmeas - n1) / slope + t1
 418          * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
 419          * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
 420          * Let constant c1 = (-1000 / slope)
 421          * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
 422          * Let constant c2 = n1 *c1 + 1000 * t1
 423          * milli_Tmeas = c2 - Nmeas * c1
 424          */
 425         temp64 = FACTOR0;
 426         temp64 *= 1000;
 427         do_div(temp64, FACTOR1 * n1 - FACTOR2);
 428         data->c1 = temp64;
 429         data->c2 = n1 * data->c1 + 1000 * t1;
 430
 431         /*
 432          * Set the default passive cooling trip point to IMX_TEMP_PASSIVE.
 433          * Can be changed from userspace.
 434          */
 435         data->temp_passive = IMX_TEMP_PASSIVE;
 436
 437         /*
 438          * Set the default critical trip point to 20 C higher
 439          * than passive trip point. Can be changed from userspace.
 440          */
 441         data->temp_critical = IMX_TEMP_PASSIVE + 20 * 1000;
 442
 443         return 0;
 444 }
 445
 446 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
 447 {
 448         struct imx_thermal_data *data = dev;
 449
 450         disable_irq_nosync(irq);
 451         data->irq_enabled = false;
 452
 453         return IRQ_WAKE_THREAD;
 454 }
 455
 456 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
 457 {
 458         struct imx_thermal_data *data = dev;
 459
 460         dev_dbg(&data->tz->device, "THERMAL ALARM: T > %lu\n",
 461                 data->alarm_temp / 1000);
 462
 463         thermal_zone_device_update(data->tz);
 464
 465         return IRQ_HANDLED;
 466 }
 467
 468 static const struct of_device_id of_imx_thermal_match[] = {
 469         { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
 470         { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
 471         { /* end */ }
 472 };
 473 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
 474
 475 static int imx_thermal_probe(struct platform_device *pdev)
 476 {
 477         const struct of_device_id *of_id =
 478                 of_match_device(of_imx_thermal_match, &pdev->dev);
 479         struct imx_thermal_data *data;
 480         struct cpumask clip_cpus;
 481         struct regmap *map;
 482         int measure_freq;
 483         int ret;
 484
 485         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 486         if (!data)
 487                 return -ENOMEM;
 488
 489         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
 490         if (IS_ERR(map)) {
 491                 ret = PTR_ERR(map);
 492                 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
 493                 return ret;
 494         }
 495         data->tempmon = map;
 496
 497         data->socdata = of_id->data;
 498
 499         /* make sure the IRQ flag is clear before enable irq */
 500         regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH);
 501         if (data->socdata->version == TEMPMON_V2) {
 502                 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPLOW |
 503                         MISC1_IRQ_TEMPPANIC);
 504                 /*
 505                  * reset value of LOW ALARM is incorrect, set it to lowest
 506                  * value to avoid false trigger of low alarm.
 507                  */
 508                 regmap_write(map, TEMPSENSE2 + REG_SET,
 509                         TEMPSENSE2_LOW_VALUE_MASK);
 510         }
 511
 512         data->irq = platform_get_irq(pdev, 0);
 513         if (data->irq < 0)
 514                 return data->irq;
 515
 516         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
 517                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
 518                         0, "imx_thermal", data);
 519         if (ret < 0) {
 520                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
 521                 return ret;
 522         }
 523
 524         platform_set_drvdata(pdev, data);
 525
 526         ret = imx_get_sensor_data(pdev);
 527         if (ret) {
 528                 dev_err(&pdev->dev, "failed to get sensor data\n");
 529                 return ret;
 530         }
 531
 532         /* Make sure sensor is in known good state for measurements */
 533         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 534         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 535         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
 536         regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
 537         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 538
 539         cpumask_set_cpu(0, &clip_cpus);
 540         data->cdev[0] = cpufreq_cooling_register(&clip_cpus);
 541         if (IS_ERR(data->cdev[0])) {
 542                 ret = PTR_ERR(data->cdev[0]);
 543                 dev_err(&pdev->dev,
 544                         "failed to register cpufreq cooling device: %d\n", ret);
 545                 return ret;
 546         }
 547
 548         data->cdev[1] = devfreq_cooling_register();
 549         if (IS_ERR(data->cdev[1])) {
 550                 ret = PTR_ERR(data->cdev[1]);
 551                 dev_err(&pdev->dev,
 552                         "failed to register devfreq cooling device: %d\n", ret);
 553                 return ret;
 554         }
 555
 556         data->tz = thermal_zone_device_register("imx_thermal_zone",
 557                                                 IMX_TRIP_NUM,
 558                                                 (1 << IMX_TRIP_NUM) - 1, data,
 559                                                 &imx_tz_ops, NULL,
 560                                                 IMX_PASSIVE_DELAY,
 561                                                 IMX_POLLING_DELAY);
 562         if (IS_ERR(data->tz)) {
 563                 ret = PTR_ERR(data->tz);
 564                 dev_err(&pdev->dev,
 565                         "failed to register thermal zone device %d\n", ret);
 566                 cpufreq_cooling_unregister(data->cdev[0]);
 567                 devfreq_cooling_unregister(data->cdev[1]);
 568                 return ret;
 569         }
 570
 571         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
 572         if (IS_ERR(data->thermal_clk)) {
 573                 dev_warn(&pdev->dev, "failed to get thermal clk!\n");
 574         } else {
 575                 /*
 576                  * Thermal sensor needs clk on to get correct value, normally
 577                  * we should enable its clk before taking measurement and disable
 578                  * clk after measurement is done, but if alarm function is enabled,
 579                  * hardware will auto measure the temperature periodically, so we
 580                  * need to keep the clk always on for alarm function.
 581                  */
 582                 ret = clk_prepare_enable(data->thermal_clk);
 583                 if (ret)
 584                         dev_warn(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
 585         }
 586
 587         /* Enable measurements at ~ 10 Hz */
 588         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
 589         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
 590         regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
 591         imx_set_alarm_temp(data, data->temp_passive);
 592
 593         if (data->socdata->version == TEMPMON_V2)
 594                 imx_set_panic_temp(data, data->temp_critical);
 595
 596         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 597         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 598
 599         data->irq_enabled = true;
 600         data->mode = THERMAL_DEVICE_ENABLED;
 601
 602         return 0;
 603 }
 604
 605 static int imx_thermal_remove(struct platform_device *pdev)
 606 {
 607         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 608         struct regmap *map = data->tempmon;
 609
 610         /* Disable measurements */
 611         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 612         if (!IS_ERR(data->thermal_clk))
 613                 clk_disable_unprepare(data->thermal_clk);
 614
 615         thermal_zone_device_unregister(data->tz);
 616         cpufreq_cooling_unregister(data->cdev[0]);
 617         devfreq_cooling_unregister(data->cdev[1]);
 618
 619         return 0;
 620 }
 621
 622 #ifdef CONFIG_PM_SLEEP
 623 static int imx_thermal_suspend(struct device *dev)
 624 {
 625         struct imx_thermal_data *data = dev_get_drvdata(dev);
 626         struct regmap *map = data->tempmon;
 627
 628         /*
 629          * Need to disable thermal sensor, otherwise, when thermal core
 630          * try to get temperature before thermal sensor resume, a wrong
 631          * temperature will be read as the thermal sensor is powered
 632          * down.
 633          */
 634         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 635         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 636         data->mode = THERMAL_DEVICE_DISABLED;
 637         disable_irq(data->irq);
 638         clk_disable_unprepare(data->thermal_clk);
 639
 640         return 0;
 641 }
 642
 643 static int imx_thermal_resume(struct device *dev)
 644 {
 645         struct imx_thermal_data *data = dev_get_drvdata(dev);
 646         struct regmap *map = data->tempmon;
 647
 648         /* Enabled thermal sensor after resume */
 649         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 650         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 651         data->mode = THERMAL_DEVICE_ENABLED;
 652         clk_prepare_enable(data->thermal_clk);
 653         enable_irq(data->irq);
 654
 655         return 0;
 656 }
 657 #endif
 658
 659 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
 660                          imx_thermal_suspend, imx_thermal_resume);
 661
 662 static struct platform_driver imx_thermal = {
 663         .driver = {
 664                 .name   = "imx_thermal",
 665                 .owner  = THIS_MODULE,
 666                 .pm     = &imx_thermal_pm_ops,
 667                 .of_match_table = of_imx_thermal_match,
 668         },
 669         .probe          = imx_thermal_probe,
 670         .remove         = imx_thermal_remove,
 671 };
 672
 673 static int __init imx_thermal_init(void)
 674 {
 675         return platform_driver_register(&imx_thermal);
 676 }
 677
 678 late_initcall(imx_thermal_init);
 679
 680 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 681 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
 682 MODULE_LICENSE("GPL v2");
 683 MODULE_ALIAS("platform:imx-thermal");