git.rot13.org Git - linux/blob - 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/cpu.h>
   7 #include <linux/cpufreq.h>
   8 #include <linux/cpu_cooling.h>
   9 #include <linux/delay.h>
  10 #include <linux/device.h>
  11 #include <linux/init.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mfd/syscon.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regmap.h>
  21 #include <linux/slab.h>
  22 #include <linux/thermal.h>
  23 #include <linux/types.h>
  24 #include <linux/nvmem-consumer.h>
  25
  26 #define REG_SET         0x4
  27 #define REG_CLR         0x8
  28 #define REG_TOG         0xc
  29
  30 /* i.MX6 specific */
  31 #define IMX6_MISC0                              0x0150
  32 #define IMX6_MISC0_REFTOP_SELBIASOFF            (1 << 3)
  33 #define IMX6_MISC1                              0x0160
  34 #define IMX6_MISC1_IRQ_TEMPHIGH                 (1 << 29)
  35 /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
  36 #define IMX6_MISC1_IRQ_TEMPLOW                  (1 << 28)
  37 #define IMX6_MISC1_IRQ_TEMPPANIC                (1 << 27)
  38
  39 #define IMX6_TEMPSENSE0                         0x0180
  40 #define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT       20
  41 #define IMX6_TEMPSENSE0_ALARM_VALUE_MASK        (0xfff << 20)
  42 #define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT          8
  43 #define IMX6_TEMPSENSE0_TEMP_CNT_MASK           (0xfff << 8)
  44 #define IMX6_TEMPSENSE0_FINISHED                (1 << 2)
  45 #define IMX6_TEMPSENSE0_MEASURE_TEMP            (1 << 1)
  46 #define IMX6_TEMPSENSE0_POWER_DOWN              (1 << 0)
  47
  48 #define IMX6_TEMPSENSE1                         0x0190
  49 #define IMX6_TEMPSENSE1_MEASURE_FREQ            0xffff
  50 #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT      0
  51
  52 #define OCOTP_MEM0                      0x0480
  53 #define OCOTP_ANA1                      0x04e0
  54
  55 /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
  56 #define IMX6_TEMPSENSE2                         0x0290
  57 #define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT         0
  58 #define IMX6_TEMPSENSE2_LOW_VALUE_MASK          0xfff
  59 #define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT       16
  60 #define IMX6_TEMPSENSE2_PANIC_VALUE_MASK        0xfff0000
  61
  62 /* i.MX7 specific */
  63 #define IMX7_ANADIG_DIGPROG                     0x800
  64 #define IMX7_TEMPSENSE0                         0x300
  65 #define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT       18
  66 #define IMX7_TEMPSENSE0_PANIC_ALARM_MASK        (0x1ff << 18)
  67 #define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT        9
  68 #define IMX7_TEMPSENSE0_HIGH_ALARM_MASK         (0x1ff << 9)
  69 #define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT         0
  70 #define IMX7_TEMPSENSE0_LOW_ALARM_MASK          0x1ff
  71
  72 #define IMX7_TEMPSENSE1                         0x310
  73 #define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT      16
  74 #define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK       (0xffff << 16)
  75 #define IMX7_TEMPSENSE1_FINISHED                (1 << 11)
  76 #define IMX7_TEMPSENSE1_MEASURE_TEMP            (1 << 10)
  77 #define IMX7_TEMPSENSE1_POWER_DOWN              (1 << 9)
  78 #define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT        0
  79 #define IMX7_TEMPSENSE1_TEMP_VALUE_MASK         0x1ff
  80
  81 /* The driver supports 1 passive trip point and 1 critical trip point */
  82 enum imx_thermal_trip {
  83         IMX_TRIP_PASSIVE,
  84         IMX_TRIP_CRITICAL,
  85         IMX_TRIP_NUM,
  86 };
  87
  88 #define IMX_POLLING_DELAY               2000 /* millisecond */
  89 #define IMX_PASSIVE_DELAY               1000
  90
  91 #define TEMPMON_IMX6Q                   1
  92 #define TEMPMON_IMX6SX                  2
  93 #define TEMPMON_IMX7D                   3
  94
  95 struct thermal_soc_data {
  96         u32 version;
  97
  98         u32 sensor_ctrl;
  99         u32 power_down_mask;
 100         u32 measure_temp_mask;
 101
 102         u32 measure_freq_ctrl;
 103         u32 measure_freq_mask;
 104         u32 measure_freq_shift;
 105
 106         u32 temp_data;
 107         u32 temp_value_mask;
 108         u32 temp_value_shift;
 109         u32 temp_valid_mask;
 110
 111         u32 panic_alarm_ctrl;
 112         u32 panic_alarm_mask;
 113         u32 panic_alarm_shift;
 114
 115         u32 high_alarm_ctrl;
 116         u32 high_alarm_mask;
 117         u32 high_alarm_shift;
 118
 119         u32 low_alarm_ctrl;
 120         u32 low_alarm_mask;
 121         u32 low_alarm_shift;
 122 };
 123
 124 static struct thermal_soc_data thermal_imx6q_data = {
 125         .version = TEMPMON_IMX6Q,
 126
 127         .sensor_ctrl = IMX6_TEMPSENSE0,
 128         .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
 129         .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
 130
 131         .measure_freq_ctrl = IMX6_TEMPSENSE1,
 132         .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
 133         .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
 134
 135         .temp_data = IMX6_TEMPSENSE0,
 136         .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
 137         .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
 138         .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
 139
 140         .high_alarm_ctrl = IMX6_TEMPSENSE0,
 141         .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
 142         .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
 143 };
 144
 145 static struct thermal_soc_data thermal_imx6sx_data = {
 146         .version = TEMPMON_IMX6SX,
 147
 148         .sensor_ctrl = IMX6_TEMPSENSE0,
 149         .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
 150         .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
 151
 152         .measure_freq_ctrl = IMX6_TEMPSENSE1,
 153         .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
 154         .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
 155
 156         .temp_data = IMX6_TEMPSENSE0,
 157         .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
 158         .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
 159         .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
 160
 161         .high_alarm_ctrl = IMX6_TEMPSENSE0,
 162         .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
 163         .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
 164
 165         .panic_alarm_ctrl = IMX6_TEMPSENSE2,
 166         .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,
 167         .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,
 168
 169         .low_alarm_ctrl = IMX6_TEMPSENSE2,
 170         .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,
 171         .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,
 172 };
 173
 174 static struct thermal_soc_data thermal_imx7d_data = {
 175         .version = TEMPMON_IMX7D,
 176
 177         .sensor_ctrl = IMX7_TEMPSENSE1,
 178         .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
 179         .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
 180
 181         .measure_freq_ctrl = IMX7_TEMPSENSE1,
 182         .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
 183         .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
 184
 185         .temp_data = IMX7_TEMPSENSE1,
 186         .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,
 187         .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,
 188         .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,
 189
 190         .panic_alarm_ctrl = IMX7_TEMPSENSE1,
 191         .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
 192         .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
 193
 194         .high_alarm_ctrl = IMX7_TEMPSENSE0,
 195         .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
 196         .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
 197
 198         .low_alarm_ctrl = IMX7_TEMPSENSE0,
 199         .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
 200         .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
 201 };
 202
 203 struct imx_thermal_data {
 204         struct cpufreq_policy *policy;
 205         struct thermal_zone_device *tz;
 206         struct thermal_cooling_device *cdev;
 207         enum thermal_device_mode mode;
 208         struct regmap *tempmon;
 209         u32 c1, c2; /* See formula in imx_init_calib() */
 210         int temp_passive;
 211         int temp_critical;
 212         int temp_max;
 213         int alarm_temp;
 214         int last_temp;
 215         bool irq_enabled;
 216         int irq;
 217         struct clk *thermal_clk;
 218         const struct thermal_soc_data *socdata;
 219         const char *temp_grade;
 220 };
 221
 222 static void imx_set_panic_temp(struct imx_thermal_data *data,
 223                                int panic_temp)
 224 {
 225         const struct thermal_soc_data *soc_data = data->socdata;
 226         struct regmap *map = data->tempmon;
 227         int critical_value;
 228
 229         critical_value = (data->c2 - panic_temp) / data->c1;
 230
 231         regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,
 232                      soc_data->panic_alarm_mask);
 233         regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,
 234                      critical_value << soc_data->panic_alarm_shift);
 235 }
 236
 237 static void imx_set_alarm_temp(struct imx_thermal_data *data,
 238                                int alarm_temp)
 239 {
 240         struct regmap *map = data->tempmon;
 241         const struct thermal_soc_data *soc_data = data->socdata;
 242         int alarm_value;
 243
 244         data->alarm_temp = alarm_temp;
 245
 246         if (data->socdata->version == TEMPMON_IMX7D)
 247                 alarm_value = alarm_temp / 1000 + data->c1 - 25;
 248         else
 249                 alarm_value = (data->c2 - alarm_temp) / data->c1;
 250
 251         regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,
 252                      soc_data->high_alarm_mask);
 253         regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,
 254                      alarm_value << soc_data->high_alarm_shift);
 255 }
 256
 257 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
 258 {
 259         struct imx_thermal_data *data = tz->devdata;
 260         const struct thermal_soc_data *soc_data = data->socdata;
 261         struct regmap *map = data->tempmon;
 262         unsigned int n_meas;
 263         bool wait;
 264         u32 val;
 265
 266         if (data->mode == THERMAL_DEVICE_ENABLED) {
 267                 /* Check if a measurement is currently in progress */
 268                 regmap_read(map, soc_data->temp_data, &val);
 269                 wait = !(val & soc_data->temp_valid_mask);
 270         } else {
 271                 /*
 272                  * Every time we measure the temperature, we will power on the
 273                  * temperature sensor, enable measurements, take a reading,
 274                  * disable measurements, power off the temperature sensor.
 275                  */
 276                 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 277                             soc_data->power_down_mask);
 278                 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
 279                             soc_data->measure_temp_mask);
 280
 281                 wait = true;
 282         }
 283
 284         /*
 285          * According to the temp sensor designers, it may require up to ~17us
 286          * to complete a measurement.
 287          */
 288         if (wait)
 289                 usleep_range(20, 50);
 290
 291         regmap_read(map, soc_data->temp_data, &val);
 292
 293         if (data->mode != THERMAL_DEVICE_ENABLED) {
 294                 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 295                              soc_data->measure_temp_mask);
 296                 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
 297                              soc_data->power_down_mask);
 298         }
 299
 300         if ((val & soc_data->temp_valid_mask) == 0) {
 301                 dev_dbg(&tz->device, "temp measurement never finished\n");
 302                 return -EAGAIN;
 303         }
 304
 305         n_meas = (val & soc_data->temp_value_mask)
 306                 >> soc_data->temp_value_shift;
 307
 308         /* See imx_init_calib() for formula derivation */
 309         if (data->socdata->version == TEMPMON_IMX7D)
 310                 *temp = (n_meas - data->c1 + 25) * 1000;
 311         else
 312                 *temp = data->c2 - n_meas * data->c1;
 313
 314         /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
 315         if (data->socdata->version == TEMPMON_IMX6Q) {
 316                 if (data->alarm_temp == data->temp_passive &&
 317                         *temp >= data->temp_passive)
 318                         imx_set_alarm_temp(data, data->temp_critical);
 319                 if (data->alarm_temp == data->temp_critical &&
 320                         *temp < data->temp_passive) {
 321                         imx_set_alarm_temp(data, data->temp_passive);
 322                         dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
 323                                 data->alarm_temp / 1000);
 324                 }
 325         }
 326
 327         if (*temp != data->last_temp) {
 328                 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
 329                 data->last_temp = *temp;
 330         }
 331
 332         /* Reenable alarm IRQ if temperature below alarm temperature */
 333         if (!data->irq_enabled && *temp < data->alarm_temp) {
 334                 data->irq_enabled = true;
 335                 enable_irq(data->irq);
 336         }
 337
 338         return 0;
 339 }
 340
 341 static int imx_get_mode(struct thermal_zone_device *tz,
 342                         enum thermal_device_mode *mode)
 343 {
 344         struct imx_thermal_data *data = tz->devdata;
 345
 346         *mode = data->mode;
 347
 348         return 0;
 349 }
 350
 351 static int imx_set_mode(struct thermal_zone_device *tz,
 352                         enum thermal_device_mode mode)
 353 {
 354         struct imx_thermal_data *data = tz->devdata;
 355         struct regmap *map = data->tempmon;
 356         const struct thermal_soc_data *soc_data = data->socdata;
 357
 358         if (mode == THERMAL_DEVICE_ENABLED) {
 359                 tz->polling_delay = IMX_POLLING_DELAY;
 360                 tz->passive_delay = IMX_PASSIVE_DELAY;
 361
 362                 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 363                              soc_data->power_down_mask);
 364                 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
 365                              soc_data->measure_temp_mask);
 366
 367                 if (!data->irq_enabled) {
 368                         data->irq_enabled = true;
 369                         enable_irq(data->irq);
 370                 }
 371         } else {
 372                 regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 373                              soc_data->measure_temp_mask);
 374                 regmap_write(map, soc_data->sensor_ctrl + REG_SET,
 375                              soc_data->power_down_mask);
 376
 377                 tz->polling_delay = 0;
 378                 tz->passive_delay = 0;
 379
 380                 if (data->irq_enabled) {
 381                         disable_irq(data->irq);
 382                         data->irq_enabled = false;
 383                 }
 384         }
 385
 386         data->mode = mode;
 387         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 388
 389         return 0;
 390 }
 391
 392 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
 393                              enum thermal_trip_type *type)
 394 {
 395         *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
 396                                              THERMAL_TRIP_CRITICAL;
 397         return 0;
 398 }
 399
 400 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
 401 {
 402         struct imx_thermal_data *data = tz->devdata;
 403
 404         *temp = data->temp_critical;
 405         return 0;
 406 }
 407
 408 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
 409                              int *temp)
 410 {
 411         struct imx_thermal_data *data = tz->devdata;
 412
 413         *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
 414                                              data->temp_critical;
 415         return 0;
 416 }
 417
 418 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
 419                              int temp)
 420 {
 421         struct imx_thermal_data *data = tz->devdata;
 422
 423         /* do not allow changing critical threshold */
 424         if (trip == IMX_TRIP_CRITICAL)
 425                 return -EPERM;
 426
 427         /* do not allow passive to be set higher than critical */
 428         if (temp < 0 || temp > data->temp_critical)
 429                 return -EINVAL;
 430
 431         data->temp_passive = temp;
 432
 433         imx_set_alarm_temp(data, temp);
 434
 435         return 0;
 436 }
 437
 438 static int imx_bind(struct thermal_zone_device *tz,
 439                     struct thermal_cooling_device *cdev)
 440 {
 441         int ret;
 442
 443         ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
 444                                                THERMAL_NO_LIMIT,
 445                                                THERMAL_NO_LIMIT,
 446                                                THERMAL_WEIGHT_DEFAULT);
 447         if (ret) {
 448                 dev_err(&tz->device,
 449                         "binding zone %s with cdev %s failed:%d\n",
 450                         tz->type, cdev->type, ret);
 451                 return ret;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static int imx_unbind(struct thermal_zone_device *tz,
 458                       struct thermal_cooling_device *cdev)
 459 {
 460         int ret;
 461
 462         ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
 463         if (ret) {
 464                 dev_err(&tz->device,
 465                         "unbinding zone %s with cdev %s failed:%d\n",
 466                         tz->type, cdev->type, ret);
 467                 return ret;
 468         }
 469
 470         return 0;
 471 }
 472
 473 static struct thermal_zone_device_ops imx_tz_ops = {
 474         .bind = imx_bind,
 475         .unbind = imx_unbind,
 476         .get_temp = imx_get_temp,
 477         .get_mode = imx_get_mode,
 478         .set_mode = imx_set_mode,
 479         .get_trip_type = imx_get_trip_type,
 480         .get_trip_temp = imx_get_trip_temp,
 481         .get_crit_temp = imx_get_crit_temp,
 482         .set_trip_temp = imx_set_trip_temp,
 483 };
 484
 485 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
 486 {
 487         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 488         int n1;
 489         u64 temp64;
 490
 491         if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
 492                 dev_err(&pdev->dev, "invalid sensor calibration data\n");
 493                 return -EINVAL;
 494         }
 495
 496         /*
 497          * On i.MX7D, we only use the calibration data at 25C to get the temp,
 498          * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
 499          */
 500         if (data->socdata->version == TEMPMON_IMX7D) {
 501                 data->c1 = (ocotp_ana1 >> 9) & 0x1ff;
 502                 return 0;
 503         }
 504
 505         /*
 506          * The sensor is calibrated at 25 °C (aka T1) and the value measured
 507          * (aka N1) at this temperature is provided in bits [31:20] in the
 508          * i.MX's OCOTP value ANA1.
 509          * To find the actual temperature T, the following formula has to be used
 510          * when reading value n from the sensor:
 511          *
 512          * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
 513          *   = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
 514          *   = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
 515          *   = c2 - c1 * N
 516          *
 517          * with
 518          *
 519          *  T1' = 28.580661 °C
 520          *   c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
 521          *   c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
 522          *      = T1' + N1 * c1
 523          */
 524         n1 = ocotp_ana1 >> 20;
 525
 526         temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
 527         temp64 *= 1000; /* to get result in °mC */
 528         do_div(temp64, 15423 * n1 - 4148468);
 529         data->c1 = temp64;
 530         data->c2 = n1 * data->c1 + 28581;
 531
 532         return 0;
 533 }
 534
 535 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
 536 {
 537         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 538
 539         /* The maximum die temp is specified by the Temperature Grade */
 540         switch ((ocotp_mem0 >> 6) & 0x3) {
 541         case 0: /* Commercial (0 to 95 °C) */
 542                 data->temp_grade = "Commercial";
 543                 data->temp_max = 95000;
 544                 break;
 545         case 1: /* Extended Commercial (-20 °C to 105 °C) */
 546                 data->temp_grade = "Extended Commercial";
 547                 data->temp_max = 105000;
 548                 break;
 549         case 2: /* Industrial (-40 °C to 105 °C) */
 550                 data->temp_grade = "Industrial";
 551                 data->temp_max = 105000;
 552                 break;
 553         case 3: /* Automotive (-40 °C to 125 °C) */
 554                 data->temp_grade = "Automotive";
 555                 data->temp_max = 125000;
 556                 break;
 557         }
 558
 559         /*
 560          * Set the critical trip point at 5 °C under max
 561          * Set the passive trip point at 10 °C under max (changeable via sysfs)
 562          */
 563         data->temp_critical = data->temp_max - (1000 * 5);
 564         data->temp_passive = data->temp_max - (1000 * 10);
 565 }
 566
 567 static int imx_init_from_tempmon_data(struct platform_device *pdev)
 568 {
 569         struct regmap *map;
 570         int ret;
 571         u32 val;
 572
 573         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 574                                               "fsl,tempmon-data");
 575         if (IS_ERR(map)) {
 576                 ret = PTR_ERR(map);
 577                 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
 578                 return ret;
 579         }
 580
 581         ret = regmap_read(map, OCOTP_ANA1, &val);
 582         if (ret) {
 583                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 584                 return ret;
 585         }
 586         ret = imx_init_calib(pdev, val);
 587         if (ret)
 588                 return ret;
 589
 590         ret = regmap_read(map, OCOTP_MEM0, &val);
 591         if (ret) {
 592                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
 593                 return ret;
 594         }
 595         imx_init_temp_grade(pdev, val);
 596
 597         return 0;
 598 }
 599
 600 static int imx_init_from_nvmem_cells(struct platform_device *pdev)
 601 {
 602         int ret;
 603         u32 val;
 604
 605         ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
 606         if (ret)
 607                 return ret;
 608         imx_init_calib(pdev, val);
 609
 610         ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
 611         if (ret)
 612                 return ret;
 613         imx_init_temp_grade(pdev, val);
 614
 615         return 0;
 616 }
 617
 618 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
 619 {
 620         struct imx_thermal_data *data = dev;
 621
 622         disable_irq_nosync(irq);
 623         data->irq_enabled = false;
 624
 625         return IRQ_WAKE_THREAD;
 626 }
 627
 628 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
 629 {
 630         struct imx_thermal_data *data = dev;
 631
 632         dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
 633                 data->alarm_temp / 1000);
 634
 635         thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
 636
 637         return IRQ_HANDLED;
 638 }
 639
 640 static const struct of_device_id of_imx_thermal_match[] = {
 641         { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
 642         { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
 643         { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
 644         { /* end */ }
 645 };
 646 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
 647
 648 /*
 649  * Create cooling device in case no #cooling-cells property is available in
 650  * CPU node
 651  */
 652 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
 653 {
 654         struct device_node *np = of_get_cpu_node(data->policy->cpu, NULL);
 655         int ret;
 656
 657         if (!np || !of_find_property(np, "#cooling-cells", NULL)) {
 658                 data->cdev = cpufreq_cooling_register(data->policy);
 659                 if (IS_ERR(data->cdev)) {
 660                         ret = PTR_ERR(data->cdev);
 661                         cpufreq_cpu_put(data->policy);
 662                         return ret;
 663                 }
 664         }
 665
 666         return 0;
 667 }
 668
 669 static int imx_thermal_probe(struct platform_device *pdev)
 670 {
 671         struct imx_thermal_data *data;
 672         struct regmap *map;
 673         int measure_freq;
 674         int ret;
 675
 676         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 677         if (!data)
 678                 return -ENOMEM;
 679
 680         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
 681         if (IS_ERR(map)) {
 682                 ret = PTR_ERR(map);
 683                 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
 684                 return ret;
 685         }
 686         data->tempmon = map;
 687
 688         data->socdata = of_device_get_match_data(&pdev->dev);
 689         if (!data->socdata) {
 690                 dev_err(&pdev->dev, "no device match found\n");
 691                 return -ENODEV;
 692         }
 693
 694         /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
 695         if (data->socdata->version == TEMPMON_IMX6SX) {
 696                 regmap_write(map, IMX6_MISC1 + REG_CLR,
 697                         IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
 698                         | IMX6_MISC1_IRQ_TEMPPANIC);
 699                 /*
 700                  * reset value of LOW ALARM is incorrect, set it to lowest
 701                  * value to avoid false trigger of low alarm.
 702                  */
 703                 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
 704                              data->socdata->low_alarm_mask);
 705         }
 706
 707         data->irq = platform_get_irq(pdev, 0);
 708         if (data->irq < 0)
 709                 return data->irq;
 710
 711         platform_set_drvdata(pdev, data);
 712
 713         if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
 714                 ret = imx_init_from_nvmem_cells(pdev);
 715                 if (ret == -EPROBE_DEFER)
 716                         return ret;
 717                 if (ret) {
 718                         dev_err(&pdev->dev, "failed to init from nvmem: %d\n",
 719                                 ret);
 720                         return ret;
 721                 }
 722         } else {
 723                 ret = imx_init_from_tempmon_data(pdev);
 724                 if (ret) {
 725                         dev_err(&pdev->dev, "failed to init from from fsl,tempmon-data\n");
 726                         return ret;
 727                 }
 728         }
 729
 730         /* Make sure sensor is in known good state for measurements */
 731         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 732                      data->socdata->power_down_mask);
 733         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 734                      data->socdata->measure_temp_mask);
 735         regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
 736                      data->socdata->measure_freq_mask);
 737         if (data->socdata->version != TEMPMON_IMX7D)
 738                 regmap_write(map, IMX6_MISC0 + REG_SET,
 739                         IMX6_MISC0_REFTOP_SELBIASOFF);
 740         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 741                      data->socdata->power_down_mask);
 742
 743         data->policy = cpufreq_cpu_get(0);
 744         if (!data->policy) {
 745                 pr_debug("%s: CPUFreq policy not found\n", __func__);
 746                 return -EPROBE_DEFER;
 747         }
 748
 749         ret = imx_thermal_register_legacy_cooling(data);
 750         if (ret) {
 751                 dev_err(&pdev->dev,
 752                         "failed to register cpufreq cooling device: %d\n", ret);
 753                 return ret;
 754         }
 755
 756         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
 757         if (IS_ERR(data->thermal_clk)) {
 758                 ret = PTR_ERR(data->thermal_clk);
 759                 if (ret != -EPROBE_DEFER)
 760                         dev_err(&pdev->dev,
 761                                 "failed to get thermal clk: %d\n", ret);
 762                 cpufreq_cooling_unregister(data->cdev);
 763                 cpufreq_cpu_put(data->policy);
 764                 return ret;
 765         }
 766
 767         /*
 768          * Thermal sensor needs clk on to get correct value, normally
 769          * we should enable its clk before taking measurement and disable
 770          * clk after measurement is done, but if alarm function is enabled,
 771          * hardware will auto measure the temperature periodically, so we
 772          * need to keep the clk always on for alarm function.
 773          */
 774         ret = clk_prepare_enable(data->thermal_clk);
 775         if (ret) {
 776                 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
 777                 cpufreq_cooling_unregister(data->cdev);
 778                 cpufreq_cpu_put(data->policy);
 779                 return ret;
 780         }
 781
 782         data->tz = thermal_zone_device_register("imx_thermal_zone",
 783                                                 IMX_TRIP_NUM,
 784                                                 BIT(IMX_TRIP_PASSIVE), data,
 785                                                 &imx_tz_ops, NULL,
 786                                                 IMX_PASSIVE_DELAY,
 787                                                 IMX_POLLING_DELAY);
 788         if (IS_ERR(data->tz)) {
 789                 ret = PTR_ERR(data->tz);
 790                 dev_err(&pdev->dev,
 791                         "failed to register thermal zone device %d\n", ret);
 792                 clk_disable_unprepare(data->thermal_clk);
 793                 cpufreq_cooling_unregister(data->cdev);
 794                 cpufreq_cpu_put(data->policy);
 795                 return ret;
 796         }
 797
 798         dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
 799                  " critical:%dC passive:%dC\n", data->temp_grade,
 800                  data->temp_max / 1000, data->temp_critical / 1000,
 801                  data->temp_passive / 1000);
 802
 803         /* Enable measurements at ~ 10 Hz */
 804         regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
 805                      data->socdata->measure_freq_mask);
 806         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
 807         regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
 808                      measure_freq << data->socdata->measure_freq_shift);
 809         imx_set_alarm_temp(data, data->temp_passive);
 810
 811         if (data->socdata->version == TEMPMON_IMX6SX)
 812                 imx_set_panic_temp(data, data->temp_critical);
 813
 814         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 815                      data->socdata->power_down_mask);
 816         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 817                      data->socdata->measure_temp_mask);
 818
 819         data->irq_enabled = true;
 820         data->mode = THERMAL_DEVICE_ENABLED;
 821
 822         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
 823                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
 824                         0, "imx_thermal", data);
 825         if (ret < 0) {
 826                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
 827                 clk_disable_unprepare(data->thermal_clk);
 828                 thermal_zone_device_unregister(data->tz);
 829                 cpufreq_cooling_unregister(data->cdev);
 830                 cpufreq_cpu_put(data->policy);
 831                 return ret;
 832         }
 833
 834         return 0;
 835 }
 836
 837 static int imx_thermal_remove(struct platform_device *pdev)
 838 {
 839         struct imx_thermal_data *data = platform_get_drvdata(pdev);
 840         struct regmap *map = data->tempmon;
 841
 842         /* Disable measurements */
 843         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 844                      data->socdata->power_down_mask);
 845         if (!IS_ERR(data->thermal_clk))
 846                 clk_disable_unprepare(data->thermal_clk);
 847
 848         thermal_zone_device_unregister(data->tz);
 849         cpufreq_cooling_unregister(data->cdev);
 850         cpufreq_cpu_put(data->policy);
 851
 852         return 0;
 853 }
 854
 855 #ifdef CONFIG_PM_SLEEP
 856 static int imx_thermal_suspend(struct device *dev)
 857 {
 858         struct imx_thermal_data *data = dev_get_drvdata(dev);
 859         struct regmap *map = data->tempmon;
 860
 861         /*
 862          * Need to disable thermal sensor, otherwise, when thermal core
 863          * try to get temperature before thermal sensor resume, a wrong
 864          * temperature will be read as the thermal sensor is powered
 865          * down.
 866          */
 867         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 868                      data->socdata->measure_temp_mask);
 869         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 870                      data->socdata->power_down_mask);
 871         data->mode = THERMAL_DEVICE_DISABLED;
 872         clk_disable_unprepare(data->thermal_clk);
 873
 874         return 0;
 875 }
 876
 877 static int imx_thermal_resume(struct device *dev)
 878 {
 879         struct imx_thermal_data *data = dev_get_drvdata(dev);
 880         struct regmap *map = data->tempmon;
 881         int ret;
 882
 883         ret = clk_prepare_enable(data->thermal_clk);
 884         if (ret)
 885                 return ret;
 886         /* Enabled thermal sensor after resume */
 887         regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
 888                      data->socdata->power_down_mask);
 889         regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
 890                      data->socdata->measure_temp_mask);
 891         data->mode = THERMAL_DEVICE_ENABLED;
 892
 893         return 0;
 894 }
 895 #endif
 896
 897 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
 898                          imx_thermal_suspend, imx_thermal_resume);
 899
 900 static struct platform_driver imx_thermal = {
 901         .driver = {
 902                 .name   = "imx_thermal",
 903                 .pm     = &imx_thermal_pm_ops,
 904                 .of_match_table = of_imx_thermal_match,
 905         },
 906         .probe          = imx_thermal_probe,
 907         .remove         = imx_thermal_remove,
 908 };
 909 module_platform_driver(imx_thermal);
 910
 911 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 912 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
 913 MODULE_LICENSE("GPL v2");
 914 MODULE_ALIAS("platform:imx-thermal");