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