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 FACTOR0                         10000000
  74 #define FACTOR1                         15976
  75 #define FACTOR2                         4297157
  76
  77 #define TEMPMON_IMX6Q                   1
  78 #define TEMPMON_IMX6SX                  2
  79
  80 struct thermal_soc_data {
  81         u32 version;
  82 };
  83
  84 static struct thermal_soc_data thermal_imx6q_data = {
  85         .version = TEMPMON_IMX6Q,
  86 };
  87
  88 static struct thermal_soc_data thermal_imx6sx_data = {
  89         .version = TEMPMON_IMX6SX,
  90 };
  91
  92 struct imx_thermal_data {
  93         struct cpufreq_policy *policy;
  94         struct thermal_zone_device *tz;
  95         struct thermal_cooling_device *cdev;
  96         enum thermal_device_mode mode;
  97         struct regmap *tempmon;
  98         u32 c1, c2; /* See formula in imx_init_calib() */
  99         int temp_passive;
 100         int temp_critical;
 101         int temp_max;
 102         int alarm_temp;
 103         int last_temp;
 104         bool irq_enabled;
 105         int irq;
 106         struct clk *thermal_clk;
 107         const struct thermal_soc_data *socdata;
 108         const char *temp_grade;
 109 };
 110
 111 static void imx_set_panic_temp(struct imx_thermal_data *data,
 112                                int panic_temp)
 113 {
 114         struct regmap *map = data->tempmon;
 115         int critical_value;
 116
 117         critical_value = (data->c2 - panic_temp) / data->c1;
 118         regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
 119         regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
 120                         TEMPSENSE2_PANIC_VALUE_SHIFT);
 121 }
 122
 123 static void imx_set_alarm_temp(struct imx_thermal_data *data,
 124                                int alarm_temp)
 125 {
 126         struct regmap *map = data->tempmon;
 127         int alarm_value;
 128
 129         data->alarm_temp = alarm_temp;
 130         alarm_value = (data->c2 - alarm_temp) / data->c1;
 131         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
 132         regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
 133                         TEMPSENSE0_ALARM_VALUE_SHIFT);
 134 }
 135
 136 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
 137 {
 138         struct imx_thermal_data *data = tz->devdata;
 139         struct regmap *map = data->tempmon;
 140         unsigned int n_meas;
 141         bool wait;
 142         u32 val;
 143
 144         if (data->mode == THERMAL_DEVICE_ENABLED) {
 145                 /* Check if a measurement is currently in progress */
 146                 regmap_read(map, TEMPSENSE0, &val);
 147                 wait = !(val & TEMPSENSE0_FINISHED);
 148         } else {
 149                 /*
 150                  * Every time we measure the temperature, we will power on the
 151                  * temperature sensor, enable measurements, take a reading,
 152                  * disable measurements, power off the temperature sensor.
 153                  */
 154                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 155                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 156
 157                 wait = true;
 158         }
 159
 160         /*
 161          * According to the temp sensor designers, it may require up to ~17us
 162          * to complete a measurement.
 163          */
 164         if (wait)
 165                 usleep_range(20, 50);
 166
 167         regmap_read(map, TEMPSENSE0, &val);
 168
 169         if (data->mode != THERMAL_DEVICE_ENABLED) {
 170                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 171                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 172         }
 173
 174         if ((val & TEMPSENSE0_FINISHED) == 0) {
 175                 dev_dbg(&tz->device, "temp measurement never finished\n");
 176                 return -EAGAIN;
 177         }
 178
 179         n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
 180
 181         /* See imx_init_calib() for formula derivation */
 182         *temp = data->c2 - n_meas * data->c1;
 183
 184         /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
 185         if (data->socdata->version == TEMPMON_IMX6Q) {
 186                 if (data->alarm_temp == data->temp_passive &&
 187                         *temp >= data->temp_passive)
 188                         imx_set_alarm_temp(data, data->temp_critical);
 189                 if (data->alarm_temp == data->temp_critical &&
 190                         *temp < data->temp_passive) {
 191                         imx_set_alarm_temp(data, data->temp_passive);
 192                         dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
 193                                 data->alarm_temp / 1000);
 194                 }
 195         }
 196
 197         if (*temp != data->last_temp) {
 198                 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
 199                 data->last_temp = *temp;
 200         }
 201
 202         /* Reenable alarm IRQ if temperature below alarm temperature */
 203         if (!data->irq_enabled && *temp < data->alarm_temp) {
 204                 data->irq_enabled = true;
 205                 enable_irq(data->irq);
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int imx_get_mode(struct thermal_zone_device *tz,
 212                         enum thermal_device_mode *mode)
 213 {
 214         struct imx_thermal_data *data = tz->devdata;
 215
 216         *mode = data->mode;
 217
 218         return 0;
 219 }
 220
 221 static int imx_set_mode(struct thermal_zone_device *tz,
 222                         enum thermal_device_mode mode)
 223 {
 224         struct imx_thermal_data *data = tz->devdata;
 225         struct regmap *map = data->tempmon;
 226
 227         if (mode == THERMAL_DEVICE_ENABLED) {
 228                 tz->polling_delay = IMX_POLLING_DELAY;
 229                 tz->passive_delay = IMX_PASSIVE_DELAY;
 230
 231                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 232                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 233
 234                 if (!data->irq_enabled) {
 235                         data->irq_enabled = true;
 236                         enable_irq(data->irq);
 237                 }
 238         } else {
 239                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 240                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 241
 242                 tz->polling_delay = 0;
 243                 tz->passive_delay = 0;
 244
 245                 if (data->irq_enabled) {
 246                         disable_irq(data->irq);
 247                         data->irq_enabled = false;
 248                 }
 249         }
 250
 251         data->mode = mode;
 252         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 253
 254         return 0;
 255 }
 256
 257 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
 258                              enum thermal_trip_type *type)
 259 {
 260         *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
 261                                              THERMAL_TRIP_CRITICAL;
 262         return 0;
 263 }
 264
 265 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
 266 {
 267         struct imx_thermal_data *data = tz->devdata;
 268
 269         *temp = data->temp_critical;
 270         return 0;
 271 }
 272
 273 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
 274                              int *temp)
 275 {
 276         struct imx_thermal_data *data = tz->devdata;
 277
 278         *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
 279                                              data->temp_critical;
 280         return 0;
 281 }
 282
 283 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
 284                              int temp)
 285 {
 286         struct imx_thermal_data *data = tz->devdata;
 287
 288         /* do not allow changing critical threshold */
 289         if (trip == IMX_TRIP_CRITICAL)
 290                 return -EPERM;
 291
 292         /* do not allow passive to be set higher than critical */
 293         if (temp < 0 || temp > data->temp_critical)
 294                 return -EINVAL;
 295
 296         data->temp_passive = temp;
 297
 298         imx_set_alarm_temp(data, temp);
 299
 300         return 0;
 301 }
 302
 303 static int imx_bind(struct thermal_zone_device *tz,
 304                     struct thermal_cooling_device *cdev)
 305 {
 306         int ret;
 307
 308         ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
 309                                                THERMAL_NO_LIMIT,
 310                                                THERMAL_NO_LIMIT,
 311                                                THERMAL_WEIGHT_DEFAULT);
 312         if (ret) {
 313                 dev_err(&tz->device,
 314                         "binding zone %s with cdev %s failed:%d\n",
 315                         tz->type, cdev->type, ret);
 316                 return ret;
 317         }
 318
 319         return 0;
 320 }
 321
 322 static int imx_unbind(struct thermal_zone_device *tz,
 323                       struct thermal_cooling_device *cdev)
 324 {
 325         int ret;
 326
 327         ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
 328         if (ret) {
 329                 dev_err(&tz->device,
 330                         "unbinding zone %s with cdev %s failed:%d\n",
 331                         tz->type, cdev->type, ret);
 332                 return ret;
 333         }
 334
 335         return 0;
 336 }
 337
 338 static struct thermal_zone_device_ops imx_tz_ops = {
 339         .bind = imx_bind,
 340         .unbind = imx_unbind,
 341         .get_temp = imx_get_temp,
 342         .get_mode = imx_get_mode,
 343         .set_mode = imx_set_mode,
 344         .get_trip_type = imx_get_trip_type,
 345         .get_trip_temp = imx_get_trip_temp,
 346         .get_crit_temp = imx_get_crit_temp,
 347         .set_trip_temp = imx_set_trip_temp,
 348 };
 349
 350 static int imx_init_calib(struct platform_device *pdev, u32 val)
 351 {
 352         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 353         int t1, n1;
 354         u64 temp64;
 355
 356         if (val == 0 || val == ~0) {
 357                 dev_err(&pdev->dev, "invalid sensor calibration data\n");
 358                 return -EINVAL;
 359         }
 360
 361         /*
 362          * Sensor data layout:
 363          *   [31:20] - sensor value @ 25C
 364          * Use universal formula now and only need sensor value @ 25C
 365          * slope = 0.4297157 - (0.0015976 * 25C fuse)
 366          */
 367         n1 = val >> 20;
 368         t1 = 25; /* t1 always 25C */
 369
 370         /*
 371          * Derived from linear interpolation:
 372          * slope = 0.4297157 - (0.0015976 * 25C fuse)
 373          * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
 374          * (Nmeas - n1) / (Tmeas - t1) = slope
 375          * We want to reduce this down to the minimum computation necessary
 376          * for each temperature read.  Also, we want Tmeas in millicelsius
 377          * and we don't want to lose precision from integer division. So...
 378          * Tmeas = (Nmeas - n1) / slope + t1
 379          * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
 380          * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
 381          * Let constant c1 = (-1000 / slope)
 382          * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
 383          * Let constant c2 = n1 *c1 + 1000 * t1
 384          * milli_Tmeas = c2 - Nmeas * c1
 385          */
 386         temp64 = FACTOR0;
 387         temp64 *= 1000;
 388         do_div(temp64, FACTOR1 * n1 - FACTOR2);
 389         data->c1 = temp64;
 390         data->c2 = n1 * data->c1 + 1000 * t1;
 391
 392         return 0;
 393 }
 394
 395 static void imx_init_temp_grade(struct platform_device *pdev, u32 val)
 396 {
 397         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 398
 399         /* The maximum die temp is specified by the Temperature Grade */
 400         switch ((val >> 6) & 0x3) {
 401         case 0: /* Commercial (0 to 95C) */
 402                 data->temp_grade = "Commercial";
 403                 data->temp_max = 95000;
 404                 break;
 405         case 1: /* Extended Commercial (-20 to 105C) */
 406                 data->temp_grade = "Extended Commercial";
 407                 data->temp_max = 105000;
 408                 break;
 409         case 2: /* Industrial (-40 to 105C) */
 410                 data->temp_grade = "Industrial";
 411                 data->temp_max = 105000;
 412                 break;
 413         case 3: /* Automotive (-40 to 125C) */
 414                 data->temp_grade = "Automotive";
 415                 data->temp_max = 125000;
 416                 break;
 417         }
 418
 419         /*
 420          * Set the critical trip point at 5C under max
 421          * Set the passive trip point at 10C under max (can change via sysfs)
 422          */
 423         data->temp_critical = data->temp_max - (1000 * 5);
 424         data->temp_passive = data->temp_max - (1000 * 10);
 425 }
 426
 427 static int imx_init_from_tempmon_data(struct platform_device *pdev)
 428 {
 429         struct regmap *map;
 430         int ret;
 431         u32 val;
 432
 433         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 434                                               "fsl,tempmon-data");
 435         if (IS_ERR(map)) {
 436                 ret = PTR_ERR(map);
 437                 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
 438                 return ret;
 439         }
 440
 441         ret = regmap_read(map, OCOTP_ANA1, &val);
 442         if (ret) {
 443                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 444                 return ret;
 445         }
 446         ret = imx_init_calib(pdev, val);
 447         if (ret)
 448                 return ret;
 449
 450         ret = regmap_read(map, OCOTP_MEM0, &val);
 451         if (ret) {
 452                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 453                 return ret;
 454         }
 455         imx_init_temp_grade(pdev, val);
 456
 457         return 0;
 458 }
 459
 460 static int imx_init_from_nvmem_cells(struct platform_device *pdev)
 461 {
 462         int ret;
 463         u32 val;
 464
 465         ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
 466         if (ret)
 467                 return ret;
 468         imx_init_calib(pdev, val);
 469
 470         ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
 471         if (ret)
 472                 return ret;
 473         imx_init_temp_grade(pdev, val);
 474
 475         return 0;
 476 }
 477
 478 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
 479 {
 480         struct imx_thermal_data *data = dev;
 481
 482         disable_irq_nosync(irq);
 483         data->irq_enabled = false;
 484
 485         return IRQ_WAKE_THREAD;
 486 }
 487
 488 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
 489 {
 490         struct imx_thermal_data *data = dev;
 491
 492         dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
 493                 data->alarm_temp / 1000);
 494
 495         thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
 496
 497         return IRQ_HANDLED;
 498 }
 499
 500 static const struct of_device_id of_imx_thermal_match[] = {
 501         { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
 502         { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
 503         { /* end */ }
 504 };
 505 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
 506
 507 static int imx_thermal_probe(struct platform_device *pdev)
 508 {
 509         struct imx_thermal_data *data;
 510         struct regmap *map;
 511         int measure_freq;
 512         int ret;
 513
 514         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 515         if (!data)
 516                 return -ENOMEM;
 517
 518         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
 519         if (IS_ERR(map)) {
 520                 ret = PTR_ERR(map);
 521                 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
 522                 return ret;
 523         }
 524         data->tempmon = map;
 525
 526         data->socdata = of_device_get_match_data(&pdev->dev);
 527         if (!data->socdata) {
 528                 dev_err(&pdev->dev, "no device match found\n");
 529                 return -ENODEV;
 530         }
 531
 532         /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
 533         if (data->socdata->version == TEMPMON_IMX6SX) {
 534                 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
 535                         MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
 536                 /*
 537                  * reset value of LOW ALARM is incorrect, set it to lowest
 538                  * value to avoid false trigger of low alarm.
 539                  */
 540                 regmap_write(map, TEMPSENSE2 + REG_SET,
 541                         TEMPSENSE2_LOW_VALUE_MASK);
 542         }
 543
 544         data->irq = platform_get_irq(pdev, 0);
 545         if (data->irq < 0)
 546                 return data->irq;
 547
 548         platform_set_drvdata(pdev, data);
 549
 550         if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
 551                 ret = imx_init_from_nvmem_cells(pdev);
 552                 if (ret == -EPROBE_DEFER)
 553                         return ret;
 554                 if (ret) {
 555                         dev_err(&pdev->dev, "failed to init from nvmem: %d\n",
 556                                 ret);
 557                         return ret;
 558                 }
 559         } else {
 560                 ret = imx_init_from_tempmon_data(pdev);
 561                 if (ret) {
 562                         dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n");
 563                         return ret;
 564                 }
 565         }
 566
 567         /* Make sure sensor is in known good state for measurements */
 568         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 569         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 570         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
 571         regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
 572         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 573
 574         data->policy = cpufreq_cpu_get(0);
 575         if (!data->policy) {
 576                 pr_debug("%s: CPUFreq policy not found\n", __func__);
 577                 return -EPROBE_DEFER;
 578         }
 579
 580         data->cdev = cpufreq_cooling_register(data->policy);
 581         if (IS_ERR(data->cdev)) {
 582                 ret = PTR_ERR(data->cdev);
 583                 dev_err(&pdev->dev,
 584                         "failed to register cpufreq cooling device: %d\n", ret);
 585                 cpufreq_cpu_put(data->policy);
 586                 return ret;
 587         }
 588
 589         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
 590         if (IS_ERR(data->thermal_clk)) {
 591                 ret = PTR_ERR(data->thermal_clk);
 592                 if (ret != -EPROBE_DEFER)
 593                         dev_err(&pdev->dev,
 594                                 "failed to get thermal clk: %d\n", ret);
 595                 cpufreq_cooling_unregister(data->cdev);
 596                 cpufreq_cpu_put(data->policy);
 597                 return ret;
 598         }
 599
 600         /*
 601          * Thermal sensor needs clk on to get correct value, normally
 602          * we should enable its clk before taking measurement and disable
 603          * clk after measurement is done, but if alarm function is enabled,
 604          * hardware will auto measure the temperature periodically, so we
 605          * need to keep the clk always on for alarm function.
 606          */
 607         ret = clk_prepare_enable(data->thermal_clk);
 608         if (ret) {
 609                 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
 610                 cpufreq_cooling_unregister(data->cdev);
 611                 cpufreq_cpu_put(data->policy);
 612                 return ret;
 613         }
 614
 615         data->tz = thermal_zone_device_register("imx_thermal_zone",
 616                                                 IMX_TRIP_NUM,
 617                                                 BIT(IMX_TRIP_PASSIVE), data,
 618                                                 &imx_tz_ops, NULL,
 619                                                 IMX_PASSIVE_DELAY,
 620                                                 IMX_POLLING_DELAY);
 621         if (IS_ERR(data->tz)) {
 622                 ret = PTR_ERR(data->tz);
 623                 dev_err(&pdev->dev,
 624                         "failed to register thermal zone device %d\n", ret);
 625                 clk_disable_unprepare(data->thermal_clk);
 626                 cpufreq_cooling_unregister(data->cdev);
 627                 cpufreq_cpu_put(data->policy);
 628                 return ret;
 629         }
 630
 631         dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
 632                  " critical:%dC passive:%dC\n", data->temp_grade,
 633                  data->temp_max / 1000, data->temp_critical / 1000,
 634                  data->temp_passive / 1000);
 635
 636         /* Enable measurements at ~ 10 Hz */
 637         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
 638         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
 639         regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
 640         imx_set_alarm_temp(data, data->temp_passive);
 641
 642         if (data->socdata->version == TEMPMON_IMX6SX)
 643                 imx_set_panic_temp(data, data->temp_critical);
 644
 645         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 646         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 647
 648         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
 649                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
 650                         0, "imx_thermal", data);
 651         if (ret < 0) {
 652                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
 653                 clk_disable_unprepare(data->thermal_clk);
 654                 thermal_zone_device_unregister(data->tz);
 655                 cpufreq_cooling_unregister(data->cdev);
 656                 cpufreq_cpu_put(data->policy);
 657                 return ret;
 658         }
 659
 660         data->irq_enabled = true;
 661         data->mode = THERMAL_DEVICE_ENABLED;
 662
 663         return 0;
 664 }
 665
 666 static int imx_thermal_remove(struct platform_device *pdev)
 667 {
 668         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 669         struct regmap *map = data->tempmon;
 670
 671         /* Disable measurements */
 672         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 673         if (!IS_ERR(data->thermal_clk))
 674                 clk_disable_unprepare(data->thermal_clk);
 675
 676         thermal_zone_device_unregister(data->tz);
 677         cpufreq_cooling_unregister(data->cdev);
 678         cpufreq_cpu_put(data->policy);
 679
 680         return 0;
 681 }
 682
 683 #ifdef CONFIG_PM_SLEEP
 684 static int imx_thermal_suspend(struct device *dev)
 685 {
 686         struct imx_thermal_data *data = dev_get_drvdata(dev);
 687         struct regmap *map = data->tempmon;
 688
 689         /*
 690          * Need to disable thermal sensor, otherwise, when thermal core
 691          * try to get temperature before thermal sensor resume, a wrong
 692          * temperature will be read as the thermal sensor is powered
 693          * down.
 694          */
 695         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 696         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 697         data->mode = THERMAL_DEVICE_DISABLED;
 698         clk_disable_unprepare(data->thermal_clk);
 699
 700         return 0;
 701 }
 702
 703 static int imx_thermal_resume(struct device *dev)
 704 {
 705         struct imx_thermal_data *data = dev_get_drvdata(dev);
 706         struct regmap *map = data->tempmon;
 707         int ret;
 708
 709         ret = clk_prepare_enable(data->thermal_clk);
 710         if (ret)
 711                 return ret;
 712         /* Enabled thermal sensor after resume */
 713         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 714         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
 715         data->mode = THERMAL_DEVICE_ENABLED;
 716
 717         return 0;
 718 }
 719 #endif
 720
 721 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
 722                          imx_thermal_suspend, imx_thermal_resume);
 723
 724 static struct platform_driver imx_thermal = {
 725         .driver = {
 726                 .name   = "imx_thermal",
 727                 .pm     = &imx_thermal_pm_ops,
 728                 .of_match_table = of_imx_thermal_match,
 729         },
 730         .probe          = imx_thermal_probe,
 731         .remove         = imx_thermal_remove,
 732 };
 733 module_platform_driver(imx_thermal);
 734
 735 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 736 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
 737 MODULE_LICENSE("GPL v2");
 738 MODULE_ALIAS("platform:imx-thermal");