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
  29 #define REG_SET         0x4
  30 #define REG_CLR         0x8
  31 #define REG_TOG         0xc
  32
  33 #define MISC0                           0x0150
  34 #define MISC0_REFTOP_SELBIASOFF         (1 << 3)
  35 #define MISC1                           0x0160
  36 #define MISC1_IRQ_TEMPHIGH              (1 << 29)
  37 /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
  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 /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
  53 #define TEMPSENSE2                      0x0290
  54 #define TEMPSENSE2_LOW_VALUE_SHIFT      0
  55 #define TEMPSENSE2_LOW_VALUE_MASK       0xfff
  56 #define TEMPSENSE2_PANIC_VALUE_SHIFT    16
  57 #define TEMPSENSE2_PANIC_VALUE_MASK     0xfff0000
  58
  59 #define OCOTP_MEM0                      0x0480
  60 #define OCOTP_ANA1                      0x04e0
  61
  62 /* The driver supports 1 passive trip point and 1 critical trip point */
  63 enum imx_thermal_trip {
  64         IMX_TRIP_PASSIVE,
  65         IMX_TRIP_CRITICAL,
  66         IMX_TRIP_NUM,
  67 };
  68
  69 #define IMX_POLLING_DELAY               2000 /* millisecond */
  70 #define IMX_PASSIVE_DELAY               1000
  71
  72 #define FACTOR0                         10000000
  73 #define FACTOR1                         15976
  74 #define FACTOR2                         4297157
  75
  76 #define TEMPMON_IMX6Q                   1
  77 #define TEMPMON_IMX6SX                  2
  78
  79 struct thermal_soc_data {
  80         u32 version;
  81 };
  82
  83 static struct thermal_soc_data thermal_imx6q_data = {
  84         .version = TEMPMON_IMX6Q,
  85 };
  86
  87 static struct thermal_soc_data thermal_imx6sx_data = {
  88         .version = TEMPMON_IMX6SX,
  89 };
  90
  91 struct imx_thermal_data {
  92         struct cpufreq_policy *policy;
  93         struct thermal_zone_device *tz;
  94         struct thermal_cooling_device *cdev;
  95         enum thermal_device_mode mode;
  96         struct regmap *tempmon;
  97         u32 c1, c2; /* See formula in imx_get_sensor_data() */
  98         int temp_passive;
  99         int temp_critical;
 100         int temp_max;
 101         int alarm_temp;
 102         int last_temp;
 103         bool irq_enabled;
 104         int irq;
 105         struct clk *thermal_clk;
 106         const struct thermal_soc_data *socdata;
 107         const char *temp_grade;
 108 };
 109
 110 static void imx_set_panic_temp(struct imx_thermal_data *data,
 111                                int panic_temp)
 112 {
 113         struct regmap *map = data->tempmon;
 114         int critical_value;
 115
 116         critical_value = (data->c2 - panic_temp) / data->c1;
 117         regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
 118         regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
 119                         TEMPSENSE2_PANIC_VALUE_SHIFT);
 120 }
 121
 122 static void imx_set_alarm_temp(struct imx_thermal_data *data,
 123                                int alarm_temp)
 124 {
 125         struct regmap *map = data->tempmon;
 126         int alarm_value;
 127
 128         data->alarm_temp = alarm_temp;
 129         alarm_value = (data->c2 - alarm_temp) / data->c1;
 130         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
 131         regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
 132                         TEMPSENSE0_ALARM_VALUE_SHIFT);
 133 }
 134
 135 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
 136 {
 137         struct imx_thermal_data *data = tz->devdata;
 138         struct regmap *map = data->tempmon;
 139         unsigned int n_meas;
 140         bool wait;
 141         u32 val;
 142
 143         if (data->mode == THERMAL_DEVICE_ENABLED) {
 144                 /* Check if a measurement is currently in progress */
 145                 regmap_read(map, TEMPSENSE0, &val);
 146                 wait = !(val & TEMPSENSE0_FINISHED);
 147         } else {
 148                 /*
 149                  * Every time we measure the temperature, we will power on the
 150                  * temperature sensor, enable measurements, take a reading,
 151                  * disable measurements, power off the temperature sensor.
 152                  */
 153                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 154                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 155
 156                 wait = true;
 157         }
 158
 159         /*
 160          * According to the temp sensor designers, it may require up to ~17us
 161          * to complete a measurement.
 162          */
 163         if (wait)
 164                 usleep_range(20, 50);
 165
 166         regmap_read(map, TEMPSENSE0, &val);
 167
 168         if (data->mode != THERMAL_DEVICE_ENABLED) {
 169                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 170                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 171         }
 172
 173         if ((val & TEMPSENSE0_FINISHED) == 0) {
 174                 dev_dbg(&tz->device, "temp measurement never finished\n");
 175                 return -EAGAIN;
 176         }
 177
 178         n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
 179
 180         /* See imx_get_sensor_data() for formula derivation */
 181         *temp = data->c2 - n_meas * data->c1;
 182
 183         /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
 184         if (data->socdata->version == TEMPMON_IMX6Q) {
 185                 if (data->alarm_temp == data->temp_passive &&
 186                         *temp >= data->temp_passive)
 187                         imx_set_alarm_temp(data, data->temp_critical);
 188                 if (data->alarm_temp == data->temp_critical &&
 189                         *temp < data->temp_passive) {
 190                         imx_set_alarm_temp(data, data->temp_passive);
 191                         dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
 192                                 data->alarm_temp / 1000);
 193                 }
 194         }
 195
 196         if (*temp != data->last_temp) {
 197                 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
 198                 data->last_temp = *temp;
 199         }
 200
 201         /* Reenable alarm IRQ if temperature below alarm temperature */
 202         if (!data->irq_enabled && *temp < data->alarm_temp) {
 203                 data->irq_enabled = true;
 204                 enable_irq(data->irq);
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int imx_get_mode(struct thermal_zone_device *tz,
 211                         enum thermal_device_mode *mode)
 212 {
 213         struct imx_thermal_data *data = tz->devdata;
 214
 215         *mode = data->mode;
 216
 217         return 0;
 218 }
 219
 220 static int imx_set_mode(struct thermal_zone_device *tz,
 221                         enum thermal_device_mode mode)
 222 {
 223         struct imx_thermal_data *data = tz->devdata;
 224         struct regmap *map = data->tempmon;
 225
 226         if (mode == THERMAL_DEVICE_ENABLED) {
 227                 tz->polling_delay = IMX_POLLING_DELAY;
 228                 tz->passive_delay = IMX_PASSIVE_DELAY;
 229
 230                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 231                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 232
 233                 if (!data->irq_enabled) {
 234                         data->irq_enabled = true;
 235                         enable_irq(data->irq);
 236                 }
 237         } else {
 238                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 239                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 240
 241                 tz->polling_delay = 0;
 242                 tz->passive_delay = 0;
 243
 244                 if (data->irq_enabled) {
 245                         disable_irq(data->irq);
 246                         data->irq_enabled = false;
 247                 }
 248         }
 249
 250         data->mode = mode;
 251         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 252
 253         return 0;
 254 }
 255
 256 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
 257                              enum thermal_trip_type *type)
 258 {
 259         *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
 260                                              THERMAL_TRIP_CRITICAL;
 261         return 0;
 262 }
 263
 264 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
 265 {
 266         struct imx_thermal_data *data = tz->devdata;
 267
 268         *temp = data->temp_critical;
 269         return 0;
 270 }
 271
 272 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
 273                              int *temp)
 274 {
 275         struct imx_thermal_data *data = tz->devdata;
 276
 277         *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
 278                                              data->temp_critical;
 279         return 0;
 280 }
 281
 282 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
 283                              int temp)
 284 {
 285         struct imx_thermal_data *data = tz->devdata;
 286
 287         /* do not allow changing critical threshold */
 288         if (trip == IMX_TRIP_CRITICAL)
 289                 return -EPERM;
 290
 291         /* do not allow passive to be set higher than critical */
 292         if (temp < 0 || temp > data->temp_critical)
 293                 return -EINVAL;
 294
 295         data->temp_passive = temp;
 296
 297         imx_set_alarm_temp(data, temp);
 298
 299         return 0;
 300 }
 301
 302 static int imx_bind(struct thermal_zone_device *tz,
 303                     struct thermal_cooling_device *cdev)
 304 {
 305         int ret;
 306
 307         ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
 308                                                THERMAL_NO_LIMIT,
 309                                                THERMAL_NO_LIMIT,
 310                                                THERMAL_WEIGHT_DEFAULT);
 311         if (ret) {
 312                 dev_err(&tz->device,
 313                         "binding zone %s with cdev %s failed:%d\n",
 314                         tz->type, cdev->type, ret);
 315                 return ret;
 316         }
 317
 318         return 0;
 319 }
 320
 321 static int imx_unbind(struct thermal_zone_device *tz,
 322                       struct thermal_cooling_device *cdev)
 323 {
 324         int ret;
 325
 326         ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
 327         if (ret) {
 328                 dev_err(&tz->device,
 329                         "unbinding zone %s with cdev %s failed:%d\n",
 330                         tz->type, cdev->type, ret);
 331                 return ret;
 332         }
 333
 334         return 0;
 335 }
 336
 337 static struct thermal_zone_device_ops imx_tz_ops = {
 338         .bind = imx_bind,
 339         .unbind = imx_unbind,
 340         .get_temp = imx_get_temp,
 341         .get_mode = imx_get_mode,
 342         .set_mode = imx_set_mode,
 343         .get_trip_type = imx_get_trip_type,
 344         .get_trip_temp = imx_get_trip_temp,
 345         .get_crit_temp = imx_get_crit_temp,
 346         .set_trip_temp = imx_set_trip_temp,
 347 };
 348
 349 static int imx_get_sensor_data(struct platform_device *pdev)
 350 {
 351         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 352         struct regmap *map;
 353         int t1, n1;
 354         int ret;
 355         u32 val;
 356         u64 temp64;
 357
 358         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 359                                               "fsl,tempmon-data");
 360         if (IS_ERR(map)) {
 361                 ret = PTR_ERR(map);
 362                 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
 363                 return ret;
 364         }
 365
 366         ret = regmap_read(map, OCOTP_ANA1, &val);
 367         if (ret) {
 368                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 369                 return ret;
 370         }
 371
 372         if (val == 0 || val == ~0) {
 373                 dev_err(&pdev->dev, "invalid sensor calibration data\n");
 374                 return -EINVAL;
 375         }
 376
 377         /*
 378          * Sensor data layout:
 379          *   [31:20] - sensor value @ 25C
 380          * Use universal formula now and only need sensor value @ 25C
 381          * slope = 0.4297157 - (0.0015976 * 25C fuse)
 382          */
 383         n1 = val >> 20;
 384         t1 = 25; /* t1 always 25C */
 385
 386         /*
 387          * Derived from linear interpolation:
 388          * slope = 0.4297157 - (0.0015976 * 25C fuse)
 389          * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
 390          * (Nmeas - n1) / (Tmeas - t1) = slope
 391          * We want to reduce this down to the minimum computation necessary
 392          * for each temperature read.  Also, we want Tmeas in millicelsius
 393          * and we don't want to lose precision from integer division. So...
 394          * Tmeas = (Nmeas - n1) / slope + t1
 395          * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
 396          * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
 397          * Let constant c1 = (-1000 / slope)
 398          * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
 399          * Let constant c2 = n1 *c1 + 1000 * t1
 400          * milli_Tmeas = c2 - Nmeas * c1
 401          */
 402         temp64 = FACTOR0;
 403         temp64 *= 1000;
 404         do_div(temp64, FACTOR1 * n1 - FACTOR2);
 405         data->c1 = temp64;
 406         data->c2 = n1 * data->c1 + 1000 * t1;
 407
 408         /* use OTP for thermal grade */
 409         ret = regmap_read(map, OCOTP_MEM0, &val);
 410         if (ret) {
 411                 dev_err(&pdev->dev, "failed to read temp grade: %d\n", ret);
 412                 return ret;
 413         }
 414
 415         /* The maximum die temp is specified by the Temperature Grade */
 416         switch ((val >> 6) & 0x3) {
 417         case 0: /* Commercial (0 to 95C) */
 418                 data->temp_grade = "Commercial";
 419                 data->temp_max = 95000;
 420                 break;
 421         case 1: /* Extended Commercial (-20 to 105C) */
 422                 data->temp_grade = "Extended Commercial";
 423                 data->temp_max = 105000;
 424                 break;
 425         case 2: /* Industrial (-40 to 105C) */
 426                 data->temp_grade = "Industrial";
 427                 data->temp_max = 105000;
 428                 break;
 429         case 3: /* Automotive (-40 to 125C) */
 430                 data->temp_grade = "Automotive";
 431                 data->temp_max = 125000;
 432                 break;
 433         }
 434
 435         /*
 436          * Set the critical trip point at 5C under max
 437          * Set the passive trip point at 10C under max (can change via sysfs)
 438          */
 439         data->temp_critical = data->temp_max - (1000 * 5);
 440         data->temp_passive = data->temp_max - (1000 * 10);
 441
 442         return 0;
 443 }
 444
 445 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
 446 {
 447         struct imx_thermal_data *data = dev;
 448
 449         disable_irq_nosync(irq);
 450         data->irq_enabled = false;
 451
 452         return IRQ_WAKE_THREAD;
 453 }
 454
 455 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
 456 {
 457         struct imx_thermal_data *data = dev;
 458
 459         dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
 460                 data->alarm_temp / 1000);
 461
 462         thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
 463
 464         return IRQ_HANDLED;
 465 }
 466
 467 static const struct of_device_id of_imx_thermal_match[] = {
 468         { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
 469         { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
 470         { /* end */ }
 471 };
 472 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
 473
 474 static int imx_thermal_probe(struct platform_device *pdev)
 475 {
 476         struct imx_thermal_data *data;
 477         struct regmap *map;
 478         int measure_freq;
 479         int ret;
 480
 481         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 482         if (!data)
 483                 return -ENOMEM;
 484
 485         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
 486         if (IS_ERR(map)) {
 487                 ret = PTR_ERR(map);
 488                 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
 489                 return ret;
 490         }
 491         data->tempmon = map;
 492
 493         data->socdata = of_device_get_match_data(&pdev->dev);
 494         if (!data->socdata) {
 495                 dev_err(&pdev->dev, "no device match found\n");
 496                 return -ENODEV;
 497         }
 498
 499         /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
 500         if (data->socdata->version == TEMPMON_IMX6SX) {
 501                 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
 502                         MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
 503                 /*
 504                  * reset value of LOW ALARM is incorrect, set it to lowest
 505                  * value to avoid false trigger of low alarm.
 506                  */
 507                 regmap_write(map, TEMPSENSE2 + REG_SET,
 508                         TEMPSENSE2_LOW_VALUE_MASK);
 509         }
 510
 511         data->irq = platform_get_irq(pdev, 0);
 512         if (data->irq < 0)
 513                 return data->irq;
 514
 515         platform_set_drvdata(pdev, data);
 516
 517         ret = imx_get_sensor_data(pdev);
 518         if (ret) {
 519                 dev_err(&pdev->dev, "failed to get sensor data\n");
 520                 return ret;
 521         }
 522
 523         /* Make sure sensor is in known good state for measurements */
 524         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 525         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 526         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
 527         regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
 528         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 529
 530         data->policy = cpufreq_cpu_get(0);
 531         if (!data->policy) {
 532                 pr_debug("%s: CPUFreq policy not found\n", __func__);
 533                 return -EPROBE_DEFER;
 534         }
 535
 536         data->cdev = cpufreq_cooling_register(data->policy);
 537         if (IS_ERR(data->cdev)) {
 538                 ret = PTR_ERR(data->cdev);
 539                 dev_err(&pdev->dev,
 540                         "failed to register cpufreq cooling device: %d\n", ret);
 541                 cpufreq_cpu_put(data->policy);
 542                 return ret;
 543         }
 544
 545         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
 546         if (IS_ERR(data->thermal_clk)) {
 547                 ret = PTR_ERR(data->thermal_clk);
 548                 if (ret != -EPROBE_DEFER)
 549                         dev_err(&pdev->dev,
 550                                 "failed to get thermal clk: %d\n", ret);
 551                 cpufreq_cooling_unregister(data->cdev);
 552                 cpufreq_cpu_put(data->policy);
 553                 return ret;
 554         }
 555
 556         /*
 557          * Thermal sensor needs clk on to get correct value, normally
 558          * we should enable its clk before taking measurement and disable
 559          * clk after measurement is done, but if alarm function is enabled,
 560          * hardware will auto measure the temperature periodically, so we
 561          * need to keep the clk always on for alarm function.
 562          */
 563         ret = clk_prepare_enable(data->thermal_clk);
 564         if (ret) {
 565                 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
 566                 cpufreq_cooling_unregister(data->cdev);
 567                 cpufreq_cpu_put(data->policy);
 568                 return ret;
 569         }
 570
 571         data->tz = thermal_zone_device_register("imx_thermal_zone",
 572                                                 IMX_TRIP_NUM,
 573                                                 BIT(IMX_TRIP_PASSIVE), data,
 574                                                 &imx_tz_ops, NULL,
 575                                                 IMX_PASSIVE_DELAY,
 576                                                 IMX_POLLING_DELAY);
 577         if (IS_ERR(data->tz)) {
 578                 ret = PTR_ERR(data->tz);
 579                 dev_err(&pdev->dev,
 580                         "failed to register thermal zone device %d\n", ret);
 581                 clk_disable_unprepare(data->thermal_clk);
 582                 cpufreq_cooling_unregister(data->cdev);
 583                 cpufreq_cpu_put(data->policy);
 584                 return ret;
 585         }
 586
 587         dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
 588                  " critical:%dC passive:%dC\n", data->temp_grade,
 589                  data->temp_max / 1000, data->temp_critical / 1000,
 590                  data->temp_passive / 1000);
 591
 592         /* Enable measurements at ~ 10 Hz */
 593         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
 594         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
 595         regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
 596         imx_set_alarm_temp(data, data->temp_passive);
 597
 598         if (data->socdata->version == TEMPMON_IMX6SX)
 599                 imx_set_panic_temp(data, data->temp_critical);
 600
 601         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 602         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 603
 604         data->irq_enabled = true;
 605         data->mode = THERMAL_DEVICE_ENABLED;
 606
 607         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
 608                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
 609                         0, "imx_thermal", data);
 610         if (ret < 0) {
 611                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
 612                 clk_disable_unprepare(data->thermal_clk);
 613                 thermal_zone_device_unregister(data->tz);
 614                 cpufreq_cooling_unregister(data->cdev);
 615                 cpufreq_cpu_put(data->policy);
 616                 return ret;
 617         }
 618
 619         return 0;
 620 }
 621
 622 static int imx_thermal_remove(struct platform_device *pdev)
 623 {
 624         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 625         struct regmap *map = data->tempmon;
 626
 627         /* Disable measurements */
 628         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 629         if (!IS_ERR(data->thermal_clk))
 630                 clk_disable_unprepare(data->thermal_clk);
 631
 632         thermal_zone_device_unregister(data->tz);
 633         cpufreq_cooling_unregister(data->cdev);
 634         cpufreq_cpu_put(data->policy);
 635
 636         return 0;
 637 }
 638
 639 #ifdef CONFIG_PM_SLEEP
 640 static int imx_thermal_suspend(struct device *dev)
 641 {
 642         struct imx_thermal_data *data = dev_get_drvdata(dev);
 643         struct regmap *map = data->tempmon;
 644
 645         /*
 646          * Need to disable thermal sensor, otherwise, when thermal core
 647          * try to get temperature before thermal sensor resume, a wrong
 648          * temperature will be read as the thermal sensor is powered
 649          * down.
 650          */
 651         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 652         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 653         data->mode = THERMAL_DEVICE_DISABLED;
 654         clk_disable_unprepare(data->thermal_clk);
 655
 656         return 0;
 657 }
 658
 659 static int imx_thermal_resume(struct device *dev)
 660 {
 661         struct imx_thermal_data *data = dev_get_drvdata(dev);
 662         struct regmap *map = data->tempmon;
 663         int ret;
 664
 665         ret = clk_prepare_enable(data->thermal_clk);
 666         if (ret)
 667                 return ret;
 668         /* Enabled thermal sensor after resume */
 669         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 670         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 671         data->mode = THERMAL_DEVICE_ENABLED;
 672
 673         return 0;
 674 }
 675 #endif
 676
 677 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
 678                          imx_thermal_suspend, imx_thermal_resume);
 679
 680 static struct platform_driver imx_thermal = {
 681         .driver = {
 682                 .name   = "imx_thermal",
 683                 .pm     = &imx_thermal_pm_ops,
 684                 .of_match_table = of_imx_thermal_match,
 685         },
 686         .probe          = imx_thermal_probe,
 687         .remove         = imx_thermal_remove,
 688 };
 689 module_platform_driver(imx_thermal);
 690
 691 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 692 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
 693 MODULE_LICENSE("GPL v2");
 694 MODULE_ALIAS("platform:imx-thermal");