drivers/thermal/imx_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright 2013 Freescale Semiconductor, Inc.
   4
   5 #include <linux/clk.h>
   6 #include <linux/cpufreq.h>
   7 #include <linux/cpu_cooling.h>
   8 #include <linux/delay.h>
   9 #include <linux/device.h>
  10 #include <linux/init.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/io.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mfd/syscon.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/slab.h>
  21 #include <linux/thermal.h>
  22 #include <linux/types.h>
  23 #include <linux/nvmem-consumer.h>
  24
  25 #define REG_SET         0x4
  26 #define REG_CLR         0x8
  27 #define REG_TOG         0xc
  28
  29 /* i.MX6 specific */
  30 #define IMX6_MISC0                              0x0150
  31 #define IMX6_MISC0_REFTOP_SELBIASOFF            (1 << 3)
  32 #define IMX6_MISC1                              0x0160
  33 #define IMX6_MISC1_IRQ_TEMPHIGH                 (1 << 29)
  34 /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
  35 #define IMX6_MISC1_IRQ_TEMPLOW                  (1 << 28)
  36 #define IMX6_MISC1_IRQ_TEMPPANIC                (1 << 27)
  37
  38 #define IMX6_TEMPSENSE0                         0x0180
  39 #define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT       20
  40 #define IMX6_TEMPSENSE0_ALARM_VALUE_MASK        (0xfff << 20)
  41 #define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT          8
  42 #define IMX6_TEMPSENSE0_TEMP_CNT_MASK           (0xfff << 8)
  43 #define IMX6_TEMPSENSE0_FINISHED                (1 << 2)
  44 #define IMX6_TEMPSENSE0_MEASURE_TEMP            (1 << 1)
  45 #define IMX6_TEMPSENSE0_POWER_DOWN              (1 << 0)
  46
  47 #define IMX6_TEMPSENSE1                         0x0190
  48 #define IMX6_TEMPSENSE1_MEASURE_FREQ            0xffff
  49 #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT      0
  50
  51 #define OCOTP_MEM0                      0x0480
  52 #define OCOTP_ANA1                      0x04e0
  53
  54 /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
  55 #define IMX6_TEMPSENSE2                         0x0290
  56 #define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT         0
  57 #define IMX6_TEMPSENSE2_LOW_VALUE_MASK          0xfff
  58 #define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT       16
  59 #define IMX6_TEMPSENSE2_PANIC_VALUE_MASK        0xfff0000
  60
  61 /* i.MX7 specific */
  62 #define IMX7_ANADIG_DIGPROG                     0x800
  63 #define IMX7_TEMPSENSE0                         0x300
  64 #define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT       18
  65 #define IMX7_TEMPSENSE0_PANIC_ALARM_MASK        (0x1ff << 18)
  66 #define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT        9
  67 #define IMX7_TEMPSENSE0_HIGH_ALARM_MASK         (0x1ff << 9)
  68 #define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT         0
  69 #define IMX7_TEMPSENSE0_LOW_ALARM_MASK          0x1ff
  70
  71 #define IMX7_TEMPSENSE1                         0x310
  72 #define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT      16
  73 #define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK       (0xffff << 16)
  74 #define IMX7_TEMPSENSE1_FINISHED                (1 << 11)
  75 #define IMX7_TEMPSENSE1_MEASURE_TEMP            (1 << 10)
  76 #define IMX7_TEMPSENSE1_POWER_DOWN              (1 << 9)
  77 #define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT        0
  78 #define IMX7_TEMPSENSE1_TEMP_VALUE_MASK         0x1ff
  79
  80 /* The driver supports 1 passive trip point and 1 critical trip point */
  81 enum imx_thermal_trip {
  82         IMX_TRIP_PASSIVE,
  83         IMX_TRIP_CRITICAL,
  84         IMX_TRIP_NUM,
  85 };
  86
  87 #define IMX_POLLING_DELAY               2000 /* millisecond */
  88 #define IMX_PASSIVE_DELAY               1000
  89
  90 #define TEMPMON_IMX6Q                   1
  91 #define TEMPMON_IMX6SX                  2
  92 #define TEMPMON_IMX7D                   3
  93
  94 struct thermal_soc_data {
  95         u32 version;
  96
  97         u32 sensor_ctrl;
  98         u32 power_down_mask;
  99         u32 measure_temp_mask;
 100
 101         u32 measure_freq_ctrl;
 102         u32 measure_freq_mask;
 103         u32 measure_freq_shift;
 104
 105         u32 temp_data;
 106         u32 temp_value_mask;
 107         u32 temp_value_shift;
 108         u32 temp_valid_mask;
 109
 110         u32 panic_alarm_ctrl;
 111         u32 panic_alarm_mask;
 112         u32 panic_alarm_shift;
 113
 114         u32 high_alarm_ctrl;
 115         u32 high_alarm_mask;
 116         u32 high_alarm_shift;
 117
 118         u32 low_alarm_ctrl;
 119         u32 low_alarm_mask;
 120         u32 low_alarm_shift;
 121 };
 122
 123 static struct thermal_soc_data thermal_imx6q_data = {
 124         .version = TEMPMON_IMX6Q,
 125
 126         .sensor_ctrl = IMX6_TEMPSENSE0,
 127         .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
 128         .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
 129
 130         .measure_freq_ctrl = IMX6_TEMPSENSE1,
 131         .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
 132         .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
 133
 134         .temp_data = IMX6_TEMPSENSE0,
 135         .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
 136         .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
 137         .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
 138
 139         .high_alarm_ctrl = IMX6_TEMPSENSE0,
 140         .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
 141         .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
 142 };
 143
 144 static struct thermal_soc_data thermal_imx6sx_data = {
 145         .version = TEMPMON_IMX6SX,
 146
 147         .sensor_ctrl = IMX6_TEMPSENSE0,
 148         .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
 149         .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
 150
 151         .measure_freq_ctrl = IMX6_TEMPSENSE1,
 152         .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
 153         .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
 154
 155         .temp_data = IMX6_TEMPSENSE0,
 156         .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
 157         .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
 158         .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
 159
 160         .high_alarm_ctrl = IMX6_TEMPSENSE0,
 161         .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
 162         .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
 163
 164         .panic_alarm_ctrl = IMX6_TEMPSENSE2,
 165         .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,
 166         .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,
 167
 168         .low_alarm_ctrl = IMX6_TEMPSENSE2,
 169         .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,
 170         .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,
 171 };
 172
 173 static struct thermal_soc_data thermal_imx7d_data = {
 174         .version = TEMPMON_IMX7D,
 175
 176         .sensor_ctrl = IMX7_TEMPSENSE1,
 177         .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
 178         .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
 179
 180         .measure_freq_ctrl = IMX7_TEMPSENSE1,
 181         .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
 182         .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
 183
 184         .temp_data = IMX7_TEMPSENSE1,
 185         .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,
 186         .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,
 187         .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,
 188
 189         .panic_alarm_ctrl = IMX7_TEMPSENSE1,
 190         .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
 191         .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
 192
 193         .high_alarm_ctrl = IMX7_TEMPSENSE0,
 194         .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
 195         .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
 196
 197         .low_alarm_ctrl = IMX7_TEMPSENSE0,
 198         .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
 199         .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
 200 };
 201
 202 struct imx_thermal_data {
 203         struct cpufreq_policy *policy;
 204         struct thermal_zone_device *tz;
 205         struct thermal_cooling_device *cdev;
 206         enum thermal_device_mode mode;
 207         struct regmap *tempmon;
 208         u32 c1, c2; /* See formula in imx_init_calib() */
 209         int temp_passive;
 210         int temp_critical;
 211         int temp_max;
 212         int alarm_temp;
 213         int last_temp;
 214         bool irq_enabled;
 215         int irq;
 216         struct clk *thermal_clk;
 217         const struct thermal_soc_data *socdata;
 218         const char *temp_grade;
 219 };
 220
 221 static void imx_set_panic_temp(struct imx_thermal_data *data,
 222                                int panic_temp)
 223 {
 224         const struct thermal_soc_data *soc_data = data->socdata;
 225         struct regmap *map = data->tempmon;
 226         int critical_value;
 227
 228         critical_value = (data->c2 - panic_temp) / data->c1;
 229
 230         regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,
 231                      soc_data->panic_alarm_mask);
 232         regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,
 233                      critical_value << soc_data->panic_alarm_shift);
 234 }
 235
 236 static void imx_set_alarm_temp(struct imx_thermal_data *data,
 237                                int alarm_temp)
 238 {
 239         struct regmap *map = data->tempmon;
 240         const struct thermal_soc_data *soc_data = data->socdata;
 241         int alarm_value;
 242
 243         data->alarm_temp = alarm_temp;
 244
 245         if (data->socdata->version == TEMPMON_IMX7D)
 246                 alarm_value = alarm_temp / 1000 + data->c1 - 25;
 247         else
 248                 alarm_value = (data->c2 - alarm_temp) / data->c1;
 249
 250         regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,
 251                      soc_data->high_alarm_mask);
 252         regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,
 253                      alarm_value << soc_data->high_alarm_shift);
 254 }
 255
 256 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
 257 {
 258         struct imx_thermal_data *data = tz->devdata;
 259         const struct thermal_soc_data *soc_data = data->socdata;
 260         struct regmap *map = data->tempmon;
 261         unsigned int n_meas;
 262         bool wait;
 263         u32 val;
 264
 265         if (data->mode == THERMAL_DEVICE_ENABLED) {
 266                 /* Check if a measurement is currently in progress */
 267                 regmap_read(map, soc_data->temp_data, &val);
 268                 wait = !(val & soc_data->temp_valid_mask);
 269         } else {
 270                 /*
 271                  * Every time we measure the temperature, we will power on the
 272                  * temperature sensor, enable measurements, take a reading,
 273                  * disable measurements, power off the temperature sensor.
 274                  */
 275                 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 276                             soc_data->power_down_mask);
 277                 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
 278                             soc_data->measure_temp_mask);
 279
 280                 wait = true;
 281         }
 282
 283         /*
 284          * According to the temp sensor designers, it may require up to ~17us
 285          * to complete a measurement.
 286          */
 287         if (wait)
 288                 usleep_range(20, 50);
 289
 290         regmap_read(map, soc_data->temp_data, &val);
 291
 292         if (data->mode != THERMAL_DEVICE_ENABLED) {
 293                 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 294                              soc_data->measure_temp_mask);
 295                 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
 296                              soc_data->power_down_mask);
 297         }
 298
 299         if ((val & soc_data->temp_valid_mask) == 0) {
 300                 dev_dbg(&tz->device, "temp measurement never finished\n");
 301                 return -EAGAIN;
 302         }
 303
 304         n_meas = (val & soc_data->temp_value_mask)
 305                 >> soc_data->temp_value_shift;
 306
 307         /* See imx_init_calib() for formula derivation */
 308         if (data->socdata->version == TEMPMON_IMX7D)
 309                 *temp = (n_meas - data->c1 + 25) * 1000;
 310         else
 311                 *temp = data->c2 - n_meas * data->c1;
 312
 313         /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
 314         if (data->socdata->version == TEMPMON_IMX6Q) {
 315                 if (data->alarm_temp == data->temp_passive &&
 316                         *temp >= data->temp_passive)
 317                         imx_set_alarm_temp(data, data->temp_critical);
 318                 if (data->alarm_temp == data->temp_critical &&
 319                         *temp < data->temp_passive) {
 320                         imx_set_alarm_temp(data, data->temp_passive);
 321                         dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
 322                                 data->alarm_temp / 1000);
 323                 }
 324         }
 325
 326         if (*temp != data->last_temp) {
 327                 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
 328                 data->last_temp = *temp;
 329         }
 330
 331         /* Reenable alarm IRQ if temperature below alarm temperature */
 332         if (!data->irq_enabled && *temp < data->alarm_temp) {
 333                 data->irq_enabled = true;
 334                 enable_irq(data->irq);
 335         }
 336
 337         return 0;
 338 }
 339
 340 static int imx_get_mode(struct thermal_zone_device *tz,
 341                         enum thermal_device_mode *mode)
 342 {
 343         struct imx_thermal_data *data = tz->devdata;
 344
 345         *mode = data->mode;
 346
 347         return 0;
 348 }
 349
 350 static int imx_set_mode(struct thermal_zone_device *tz,
 351                         enum thermal_device_mode mode)
 352 {
 353         struct imx_thermal_data *data = tz->devdata;
 354         struct regmap *map = data->tempmon;
 355         const struct thermal_soc_data *soc_data = data->socdata;
 356
 357         if (mode == THERMAL_DEVICE_ENABLED) {
 358                 tz->polling_delay = IMX_POLLING_DELAY;
 359                 tz->passive_delay = IMX_PASSIVE_DELAY;
 360
 361                 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 362                              soc_data->power_down_mask);
 363                 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
 364                              soc_data->measure_temp_mask);
 365
 366                 if (!data->irq_enabled) {
 367                         data->irq_enabled = true;
 368                         enable_irq(data->irq);
 369                 }
 370         } else {
 371                 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 372                              soc_data->measure_temp_mask);
 373                 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
 374                              soc_data->power_down_mask);
 375
 376                 tz->polling_delay = 0;
 377                 tz->passive_delay = 0;
 378
 379                 if (data->irq_enabled) {
 380                         disable_irq(data->irq);
 381                         data->irq_enabled = false;
 382                 }
 383         }
 384
 385         data->mode = mode;
 386         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 387
 388         return 0;
 389 }
 390
 391 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
 392                              enum thermal_trip_type *type)
 393 {
 394         *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
 395                                              THERMAL_TRIP_CRITICAL;
 396         return 0;
 397 }
 398
 399 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
 400 {
 401         struct imx_thermal_data *data = tz->devdata;
 402
 403         *temp = data->temp_critical;
 404         return 0;
 405 }
 406
 407 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
 408                              int *temp)
 409 {
 410         struct imx_thermal_data *data = tz->devdata;
 411
 412         *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
 413                                              data->temp_critical;
 414         return 0;
 415 }
 416
 417 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
 418                              int temp)
 419 {
 420         struct imx_thermal_data *data = tz->devdata;
 421
 422         /* do not allow changing critical threshold */
 423         if (trip == IMX_TRIP_CRITICAL)
 424                 return -EPERM;
 425
 426         /* do not allow passive to be set higher than critical */
 427         if (temp < 0 || temp > data->temp_critical)
 428                 return -EINVAL;
 429
 430         data->temp_passive = temp;
 431
 432         imx_set_alarm_temp(data, temp);
 433
 434         return 0;
 435 }
 436
 437 static int imx_bind(struct thermal_zone_device *tz,
 438                     struct thermal_cooling_device *cdev)
 439 {
 440         int ret;
 441
 442         ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
 443                                                THERMAL_NO_LIMIT,
 444                                                THERMAL_NO_LIMIT,
 445                                                THERMAL_WEIGHT_DEFAULT);
 446         if (ret) {
 447                 dev_err(&tz->device,
 448                         "binding zone %s with cdev %s failed:%d\n",
 449                         tz->type, cdev->type, ret);
 450                 return ret;
 451         }
 452
 453         return 0;
 454 }
 455
 456 static int imx_unbind(struct thermal_zone_device *tz,
 457                       struct thermal_cooling_device *cdev)
 458 {
 459         int ret;
 460
 461         ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
 462         if (ret) {
 463                 dev_err(&tz->device,
 464                         "unbinding zone %s with cdev %s failed:%d\n",
 465                         tz->type, cdev->type, ret);
 466                 return ret;
 467         }
 468
 469         return 0;
 470 }
 471
 472 static struct thermal_zone_device_ops imx_tz_ops = {
 473         .bind = imx_bind,
 474         .unbind = imx_unbind,
 475         .get_temp = imx_get_temp,
 476         .get_mode = imx_get_mode,
 477         .set_mode = imx_set_mode,
 478         .get_trip_type = imx_get_trip_type,
 479         .get_trip_temp = imx_get_trip_temp,
 480         .get_crit_temp = imx_get_crit_temp,
 481         .set_trip_temp = imx_set_trip_temp,
 482 };
 483
 484 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
 485 {
 486         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 487         int n1;
 488         u64 temp64;
 489
 490         if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
 491                 dev_err(&pdev->dev, "invalid sensor calibration data\n");
 492                 return -EINVAL;
 493         }
 494
 495         /*
 496          * On i.MX7D, we only use the calibration data at 25C to get the temp,
 497          * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
 498          */
 499         if (data->socdata->version == TEMPMON_IMX7D) {
 500                 data->c1 = (ocotp_ana1 >> 9) & 0x1ff;
 501                 return 0;
 502         }
 503
 504         /*
 505          * The sensor is calibrated at 25 °C (aka T1) and the value measured
 506          * (aka N1) at this temperature is provided in bits [31:20] in the
 507          * i.MX's OCOTP value ANA1.
 508          * To find the actual temperature T, the following formula has to be used
 509          * when reading value n from the sensor:
 510          *
 511          * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
 512          *   = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
 513          *   = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
 514          *   = c2 - c1 * N
 515          *
 516          * with
 517          *
 518          *  T1' = 28.580661 °C
 519          *   c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
 520          *   c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
 521          *      = T1' + N1 * c1
 522          */
 523         n1 = ocotp_ana1 >> 20;
 524
 525         temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
 526         temp64 *= 1000; /* to get result in °mC */
 527         do_div(temp64, 15423 * n1 - 4148468);
 528         data->c1 = temp64;
 529         data->c2 = n1 * data->c1 + 28581;
 530
 531         return 0;
 532 }
 533
 534 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
 535 {
 536         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 537
 538         /* The maximum die temp is specified by the Temperature Grade */
 539         switch ((ocotp_mem0 >> 6) & 0x3) {
 540         case 0: /* Commercial (0 to 95 °C) */
 541                 data->temp_grade = "Commercial";
 542                 data->temp_max = 95000;
 543                 break;
 544         case 1: /* Extended Commercial (-20 °C to 105 °C) */
 545                 data->temp_grade = "Extended Commercial";
 546                 data->temp_max = 105000;
 547                 break;
 548         case 2: /* Industrial (-40 °C to 105 °C) */
 549                 data->temp_grade = "Industrial";
 550                 data->temp_max = 105000;
 551                 break;
 552         case 3: /* Automotive (-40 °C to 125 °C) */
 553                 data->temp_grade = "Automotive";
 554                 data->temp_max = 125000;
 555                 break;
 556         }
 557
 558         /*
 559          * Set the critical trip point at 5 °C under max
 560          * Set the passive trip point at 10 °C under max (changeable via sysfs)
 561          */
 562         data->temp_critical = data->temp_max - (1000 * 5);
 563         data->temp_passive = data->temp_max - (1000 * 10);
 564 }
 565
 566 static int imx_init_from_tempmon_data(struct platform_device *pdev)
 567 {
 568         struct regmap *map;
 569         int ret;
 570         u32 val;
 571
 572         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 573                                               "fsl,tempmon-data");
 574         if (IS_ERR(map)) {
 575                 ret = PTR_ERR(map);
 576                 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
 577                 return ret;
 578         }
 579
 580         ret = regmap_read(map, OCOTP_ANA1, &val);
 581         if (ret) {
 582                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 583                 return ret;
 584         }
 585         ret = imx_init_calib(pdev, val);
 586         if (ret)
 587                 return ret;
 588
 589         ret = regmap_read(map, OCOTP_MEM0, &val);
 590         if (ret) {
 591                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 592                 return ret;
 593         }
 594         imx_init_temp_grade(pdev, val);
 595
 596         return 0;
 597 }
 598
 599 static int imx_init_from_nvmem_cells(struct platform_device *pdev)
 600 {
 601         int ret;
 602         u32 val;
 603
 604         ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
 605         if (ret)
 606                 return ret;
 607         imx_init_calib(pdev, val);
 608
 609         ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
 610         if (ret)
 611                 return ret;
 612         imx_init_temp_grade(pdev, val);
 613
 614         return 0;
 615 }
 616
 617 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
 618 {
 619         struct imx_thermal_data *data = dev;
 620
 621         disable_irq_nosync(irq);
 622         data->irq_enabled = false;
 623
 624         return IRQ_WAKE_THREAD;
 625 }
 626
 627 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
 628 {
 629         struct imx_thermal_data *data = dev;
 630
 631         dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
 632                 data->alarm_temp / 1000);
 633
 634         thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
 635
 636         return IRQ_HANDLED;
 637 }
 638
 639 static const struct of_device_id of_imx_thermal_match[] = {
 640         { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
 641         { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
 642         { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
 643         { /* end */ }
 644 };
 645 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
 646
 647 static int imx_thermal_probe(struct platform_device *pdev)
 648 {
 649         struct imx_thermal_data *data;
 650         struct regmap *map;
 651         int measure_freq;
 652         int ret;
 653
 654         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 655         if (!data)
 656                 return -ENOMEM;
 657
 658         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
 659         if (IS_ERR(map)) {
 660                 ret = PTR_ERR(map);
 661                 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
 662                 return ret;
 663         }
 664         data->tempmon = map;
 665
 666         data->socdata = of_device_get_match_data(&pdev->dev);
 667         if (!data->socdata) {
 668                 dev_err(&pdev->dev, "no device match found\n");
 669                 return -ENODEV;
 670         }
 671
 672         /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
 673         if (data->socdata->version == TEMPMON_IMX6SX) {
 674                 regmap_write(map, IMX6_MISC1 + REG_CLR,
 675                         IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
 676                         | IMX6_MISC1_IRQ_TEMPPANIC);
 677                 /*
 678                  * reset value of LOW ALARM is incorrect, set it to lowest
 679                  * value to avoid false trigger of low alarm.
 680                  */
 681                 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
 682                              data->socdata->low_alarm_mask);
 683         }
 684
 685         data->irq = platform_get_irq(pdev, 0);
 686         if (data->irq < 0)
 687                 return data->irq;
 688
 689         platform_set_drvdata(pdev, data);
 690
 691         if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
 692                 ret = imx_init_from_nvmem_cells(pdev);
 693                 if (ret == -EPROBE_DEFER)
 694                         return ret;
 695                 if (ret) {
 696                         dev_err(&pdev->dev, "failed to init from nvmem: %d\n",
 697                                 ret);
 698                         return ret;
 699                 }
 700         } else {
 701                 ret = imx_init_from_tempmon_data(pdev);
 702                 if (ret) {
 703                         dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n");
 704                         return ret;
 705                 }
 706         }
 707
 708         /* Make sure sensor is in known good state for measurements */
 709         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 710                      data->socdata->power_down_mask);
 711         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 712                      data->socdata->measure_temp_mask);
 713         regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
 714                      data->socdata->measure_freq_mask);
 715         if (data->socdata->version != TEMPMON_IMX7D)
 716                 regmap_write(map, IMX6_MISC0 + REG_SET,
 717                         IMX6_MISC0_REFTOP_SELBIASOFF);
 718         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 719                      data->socdata->power_down_mask);
 720
 721         data->policy = cpufreq_cpu_get(0);
 722         if (!data->policy) {
 723                 pr_debug("%s: CPUFreq policy not found\n", __func__);
 724                 return -EPROBE_DEFER;
 725         }
 726
 727         data->cdev = cpufreq_cooling_register(data->policy);
 728         if (IS_ERR(data->cdev)) {
 729                 ret = PTR_ERR(data->cdev);
 730                 dev_err(&pdev->dev,
 731                         "failed to register cpufreq cooling device: %d\n", ret);
 732                 cpufreq_cpu_put(data->policy);
 733                 return ret;
 734         }
 735
 736         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
 737         if (IS_ERR(data->thermal_clk)) {
 738                 ret = PTR_ERR(data->thermal_clk);
 739                 if (ret != -EPROBE_DEFER)
 740                         dev_err(&pdev->dev,
 741                                 "failed to get thermal clk: %d\n", ret);
 742                 cpufreq_cooling_unregister(data->cdev);
 743                 cpufreq_cpu_put(data->policy);
 744                 return ret;
 745         }
 746
 747         /*
 748          * Thermal sensor needs clk on to get correct value, normally
 749          * we should enable its clk before taking measurement and disable
 750          * clk after measurement is done, but if alarm function is enabled,
 751          * hardware will auto measure the temperature periodically, so we
 752          * need to keep the clk always on for alarm function.
 753          */
 754         ret = clk_prepare_enable(data->thermal_clk);
 755         if (ret) {
 756                 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
 757                 cpufreq_cooling_unregister(data->cdev);
 758                 cpufreq_cpu_put(data->policy);
 759                 return ret;
 760         }
 761
 762         data->tz = thermal_zone_device_register("imx_thermal_zone",
 763                                                 IMX_TRIP_NUM,
 764                                                 BIT(IMX_TRIP_PASSIVE), data,
 765                                                 &imx_tz_ops, NULL,
 766                                                 IMX_PASSIVE_DELAY,
 767                                                 IMX_POLLING_DELAY);
 768         if (IS_ERR(data->tz)) {
 769                 ret = PTR_ERR(data->tz);
 770                 dev_err(&pdev->dev,
 771                         "failed to register thermal zone device %d\n", ret);
 772                 clk_disable_unprepare(data->thermal_clk);
 773                 cpufreq_cooling_unregister(data->cdev);
 774                 cpufreq_cpu_put(data->policy);
 775                 return ret;
 776         }
 777
 778         dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
 779                  " critical:%dC passive:%dC\n", data->temp_grade,
 780                  data->temp_max / 1000, data->temp_critical / 1000,
 781                  data->temp_passive / 1000);
 782
 783         /* Enable measurements at ~ 10 Hz */
 784         regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
 785                      data->socdata->measure_freq_mask);
 786         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
 787         regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
 788                      measure_freq << data->socdata->measure_freq_shift);
 789         imx_set_alarm_temp(data, data->temp_passive);
 790
 791         if (data->socdata->version == TEMPMON_IMX6SX)
 792                 imx_set_panic_temp(data, data->temp_critical);
 793
 794         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 795                      data->socdata->power_down_mask);
 796         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 797                      data->socdata->measure_temp_mask);
 798
 799         data->irq_enabled = true;
 800         data->mode = THERMAL_DEVICE_ENABLED;
 801
 802         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
 803                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
 804                         0, "imx_thermal", data);
 805         if (ret < 0) {
 806                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
 807                 clk_disable_unprepare(data->thermal_clk);
 808                 thermal_zone_device_unregister(data->tz);
 809                 cpufreq_cooling_unregister(data->cdev);
 810                 cpufreq_cpu_put(data->policy);
 811                 return ret;
 812         }
 813
 814         return 0;
 815 }
 816
 817 static int imx_thermal_remove(struct platform_device *pdev)
 818 {
 819         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 820         struct regmap *map = data->tempmon;
 821
 822         /* Disable measurements */
 823         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 824                      data->socdata->power_down_mask);
 825         if (!IS_ERR(data->thermal_clk))
 826                 clk_disable_unprepare(data->thermal_clk);
 827
 828         thermal_zone_device_unregister(data->tz);
 829         cpufreq_cooling_unregister(data->cdev);
 830         cpufreq_cpu_put(data->policy);
 831
 832         return 0;
 833 }
 834
 835 #ifdef CONFIG_PM_SLEEP
 836 static int imx_thermal_suspend(struct device *dev)
 837 {
 838         struct imx_thermal_data *data = dev_get_drvdata(dev);
 839         struct regmap *map = data->tempmon;
 840
 841         /*
 842          * Need to disable thermal sensor, otherwise, when thermal core
 843          * try to get temperature before thermal sensor resume, a wrong
 844          * temperature will be read as the thermal sensor is powered
 845          * down.
 846          */
 847         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 848                      data->socdata->measure_temp_mask);
 849         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 850                      data->socdata->power_down_mask);
 851         data->mode = THERMAL_DEVICE_DISABLED;
 852         clk_disable_unprepare(data->thermal_clk);
 853
 854         return 0;
 855 }
 856
 857 static int imx_thermal_resume(struct device *dev)
 858 {
 859         struct imx_thermal_data *data = dev_get_drvdata(dev);
 860         struct regmap *map = data->tempmon;
 861         int ret;
 862
 863         ret = clk_prepare_enable(data->thermal_clk);
 864         if (ret)
 865                 return ret;
 866         /* Enabled thermal sensor after resume */
 867         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 868                      data->socdata->power_down_mask);
 869         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 870                      data->socdata->measure_temp_mask);
 871         data->mode = THERMAL_DEVICE_ENABLED;
 872
 873         return 0;
 874 }
 875 #endif
 876
 877 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
 878                          imx_thermal_suspend, imx_thermal_resume);
 879
 880 static struct platform_driver imx_thermal = {
 881         .driver = {
 882                 .name   = "imx_thermal",
 883                 .pm     = &imx_thermal_pm_ops,
 884                 .of_match_table = of_imx_thermal_match,
 885         },
 886         .probe          = imx_thermal_probe,
 887         .remove         = imx_thermal_remove,
 888 };
 889 module_platform_driver(imx_thermal);
 890
 891 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 892 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
 893 MODULE_LICENSE("GPL v2");
 894 MODULE_ALIAS("platform:imx-thermal");