drivers/thermal/sprd_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2020 Spreadtrum Communications Inc.
   3
   4 #include <linux/clk.h>
   5 #include <linux/io.h>
   6 #include <linux/iopoll.h>
   7 #include <linux/module.h>
   8 #include <linux/nvmem-consumer.h>
   9 #include <linux/of_device.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/slab.h>
  12 #include <linux/thermal.h>
  13
  14 #define SPRD_THM_CTL                    0x0
  15 #define SPRD_THM_INT_EN                 0x4
  16 #define SPRD_THM_INT_STS                0x8
  17 #define SPRD_THM_INT_RAW_STS            0xc
  18 #define SPRD_THM_DET_PERIOD             0x10
  19 #define SPRD_THM_INT_CLR                0x14
  20 #define SPRD_THM_INT_CLR_ST             0x18
  21 #define SPRD_THM_MON_PERIOD             0x4c
  22 #define SPRD_THM_MON_CTL                0x50
  23 #define SPRD_THM_INTERNAL_STS1          0x54
  24 #define SPRD_THM_RAW_READ_MSK           0x3ff
  25
  26 #define SPRD_THM_OFFSET(id)             ((id) * 0x4)
  27 #define SPRD_THM_TEMP(id)               (SPRD_THM_OFFSET(id) + 0x5c)
  28 #define SPRD_THM_THRES(id)              (SPRD_THM_OFFSET(id) + 0x2c)
  29
  30 #define SPRD_THM_SEN(id)                BIT((id) + 2)
  31 #define SPRD_THM_SEN_OVERHEAT_EN(id)    BIT((id) + 8)
  32 #define SPRD_THM_SEN_OVERHEAT_ALARM_EN(id)      BIT((id) + 0)
  33
  34 /* bits definitions for register THM_CTL */
  35 #define SPRD_THM_SET_RDY_ST             BIT(13)
  36 #define SPRD_THM_SET_RDY                BIT(12)
  37 #define SPRD_THM_MON_EN                 BIT(1)
  38 #define SPRD_THM_EN                     BIT(0)
  39
  40 /* bits definitions for register THM_INT_CTL */
  41 #define SPRD_THM_BIT_INT_EN             BIT(26)
  42 #define SPRD_THM_OVERHEAT_EN            BIT(25)
  43 #define SPRD_THM_OTP_TRIP_SHIFT         10
  44
  45 /* bits definitions for register SPRD_THM_INTERNAL_STS1 */
  46 #define SPRD_THM_TEMPER_RDY             BIT(0)
  47
  48 #define SPRD_THM_DET_PERIOD_DATA        0x800
  49 #define SPRD_THM_DET_PERIOD_MASK        GENMASK(19, 0)
  50 #define SPRD_THM_MON_MODE               0x7
  51 #define SPRD_THM_MON_MODE_MASK          GENMASK(3, 0)
  52 #define SPRD_THM_MON_PERIOD_DATA        0x10
  53 #define SPRD_THM_MON_PERIOD_MASK        GENMASK(15, 0)
  54 #define SPRD_THM_THRES_MASK             GENMASK(19, 0)
  55 #define SPRD_THM_INT_CLR_MASK           GENMASK(24, 0)
  56
  57 /* thermal sensor calibration parameters */
  58 #define SPRD_THM_TEMP_LOW               -40000
  59 #define SPRD_THM_TEMP_HIGH              120000
  60 #define SPRD_THM_OTP_TEMP               120000
  61 #define SPRD_THM_HOT_TEMP               75000
  62 #define SPRD_THM_RAW_DATA_LOW           0
  63 #define SPRD_THM_RAW_DATA_HIGH          1000
  64 #define SPRD_THM_SEN_NUM                8
  65 #define SPRD_THM_DT_OFFSET              24
  66 #define SPRD_THM_RATION_OFFSET          17
  67 #define SPRD_THM_RATION_SIGN            16
  68
  69 #define SPRD_THM_RDYST_POLLING_TIME     10
  70 #define SPRD_THM_RDYST_TIMEOUT          700
  71 #define SPRD_THM_TEMP_READY_POLL_TIME   10000
  72 #define SPRD_THM_TEMP_READY_TIMEOUT     600000
  73 #define SPRD_THM_MAX_SENSOR             8
  74
  75 struct sprd_thermal_sensor {
  76         struct thermal_zone_device *tzd;
  77         struct sprd_thermal_data *data;
  78         struct device *dev;
  79         int cal_slope;
  80         int cal_offset;
  81         int id;
  82 };
  83
  84 struct sprd_thermal_data {
  85         const struct sprd_thm_variant_data *var_data;
  86         struct sprd_thermal_sensor *sensor[SPRD_THM_MAX_SENSOR];
  87         struct clk *clk;
  88         void __iomem *base;
  89         u32 ratio_off;
  90         int ratio_sign;
  91         int nr_sensors;
  92 };
  93
  94 /*
  95  * The conversion between ADC and temperature is based on linear relationship,
  96  * and use idea_k to specify the slope and ideal_b to specify the offset.
  97  *
  98  * Since different Spreadtrum SoCs have different ideal_k and ideal_b,
  99  * we should save ideal_k and ideal_b in the device data structure.
 100  */
 101 struct sprd_thm_variant_data {
 102         u32 ideal_k;
 103         u32 ideal_b;
 104 };
 105
 106 static const struct sprd_thm_variant_data ums512_data = {
 107         .ideal_k = 262,
 108         .ideal_b = 66400,
 109 };
 110
 111 static inline void sprd_thm_update_bits(void __iomem *reg, u32 mask, u32 val)
 112 {
 113         u32 tmp, orig;
 114
 115         orig = readl(reg);
 116         tmp = orig & ~mask;
 117         tmp |= val & mask;
 118         writel(tmp, reg);
 119 }
 120
 121 static int sprd_thm_cal_read(struct device_node *np, const char *cell_id,
 122                              u32 *val)
 123 {
 124         struct nvmem_cell *cell;
 125         void *buf;
 126         size_t len;
 127
 128         cell = of_nvmem_cell_get(np, cell_id);
 129         if (IS_ERR(cell))
 130                 return PTR_ERR(cell);
 131
 132         buf = nvmem_cell_read(cell, &len);
 133         nvmem_cell_put(cell);
 134         if (IS_ERR(buf))
 135                 return PTR_ERR(buf);
 136
 137         if (len > sizeof(u32)) {
 138                 kfree(buf);
 139                 return -EINVAL;
 140         }
 141
 142         memcpy(val, buf, len);
 143
 144         kfree(buf);
 145         return 0;
 146 }
 147
 148 static int sprd_thm_sensor_calibration(struct device_node *np,
 149                                        struct sprd_thermal_data *thm,
 150                                        struct sprd_thermal_sensor *sen)
 151 {
 152         int ret;
 153         /*
 154          * According to thermal datasheet, the default calibration offset is 64,
 155          * and the default ratio is 1000.
 156          */
 157         int dt_offset = 64, ratio = 1000;
 158
 159         ret = sprd_thm_cal_read(np, "sen_delta_cal", &dt_offset);
 160         if (ret)
 161                 return ret;
 162
 163         ratio += thm->ratio_sign * thm->ratio_off;
 164
 165         /*
 166          * According to the ideal slope K and ideal offset B, combined with
 167          * calibration value of thermal from efuse, then calibrate the real
 168          * slope k and offset b:
 169          * k_cal = (k * ratio) / 1000.
 170          * b_cal = b + (dt_offset - 64) * 500.
 171          */
 172         sen->cal_slope = (thm->var_data->ideal_k * ratio) / 1000;
 173         sen->cal_offset = thm->var_data->ideal_b + (dt_offset - 128) * 250;
 174
 175         return 0;
 176 }
 177
 178 static int sprd_thm_rawdata_to_temp(struct sprd_thermal_sensor *sen,
 179                                     u32 rawdata)
 180 {
 181         clamp(rawdata, (u32)SPRD_THM_RAW_DATA_LOW, (u32)SPRD_THM_RAW_DATA_HIGH);
 182
 183         /*
 184          * According to the thermal datasheet, the formula of converting
 185          * adc value to the temperature value should be:
 186          * T_final = k_cal * x - b_cal.
 187          */
 188         return sen->cal_slope * rawdata - sen->cal_offset;
 189 }
 190
 191 static int sprd_thm_temp_to_rawdata(int temp, struct sprd_thermal_sensor *sen)
 192 {
 193         u32 val;
 194
 195         clamp(temp, (int)SPRD_THM_TEMP_LOW, (int)SPRD_THM_TEMP_HIGH);
 196
 197         /*
 198          * According to the thermal datasheet, the formula of converting
 199          * adc value to the temperature value should be:
 200          * T_final = k_cal * x - b_cal.
 201          */
 202         val = (temp + sen->cal_offset) / sen->cal_slope;
 203
 204         return clamp(val, val, (u32)(SPRD_THM_RAW_DATA_HIGH - 1));
 205 }
 206
 207 static int sprd_thm_read_temp(void *devdata, int *temp)
 208 {
 209         struct sprd_thermal_sensor *sen = devdata;
 210         u32 data;
 211
 212         data = readl(sen->data->base + SPRD_THM_TEMP(sen->id)) &
 213                 SPRD_THM_RAW_READ_MSK;
 214
 215         *temp = sprd_thm_rawdata_to_temp(sen, data);
 216
 217         return 0;
 218 }
 219
 220 static const struct thermal_zone_of_device_ops sprd_thm_ops = {
 221         .get_temp = sprd_thm_read_temp,
 222 };
 223
 224 static int sprd_thm_poll_ready_status(struct sprd_thermal_data *thm)
 225 {
 226         u32 val;
 227         int ret;
 228
 229         /*
 230          * Wait for thermal ready status before configuring thermal parameters.
 231          */
 232         ret = readl_poll_timeout(thm->base + SPRD_THM_CTL, val,
 233                                  !(val & SPRD_THM_SET_RDY_ST),
 234                                  SPRD_THM_RDYST_POLLING_TIME,
 235                                  SPRD_THM_RDYST_TIMEOUT);
 236         if (ret)
 237                 return ret;
 238
 239         sprd_thm_update_bits(thm->base + SPRD_THM_CTL, SPRD_THM_MON_EN,
 240                              SPRD_THM_MON_EN);
 241         sprd_thm_update_bits(thm->base + SPRD_THM_CTL, SPRD_THM_SET_RDY,
 242                              SPRD_THM_SET_RDY);
 243         return 0;
 244 }
 245
 246 static int sprd_thm_wait_temp_ready(struct sprd_thermal_data *thm)
 247 {
 248         u32 val;
 249
 250         /* Wait for first temperature data ready before reading temperature */
 251         return readl_poll_timeout(thm->base + SPRD_THM_INTERNAL_STS1, val,
 252                                   !(val & SPRD_THM_TEMPER_RDY),
 253                                   SPRD_THM_TEMP_READY_POLL_TIME,
 254                                   SPRD_THM_TEMP_READY_TIMEOUT);
 255 }
 256
 257 static int sprd_thm_set_ready(struct sprd_thermal_data *thm)
 258 {
 259         int ret;
 260
 261         ret = sprd_thm_poll_ready_status(thm);
 262         if (ret)
 263                 return ret;
 264
 265         /*
 266          * Clear interrupt status, enable thermal interrupt and enable thermal.
 267          *
 268          * The SPRD thermal controller integrates a hardware interrupt signal,
 269          * which means if the temperature is overheat, it will generate an
 270          * interrupt and notify the event to PMIC automatically to shutdown the
 271          * system. So here we should enable the interrupt bits, though we have
 272          * not registered an irq handler.
 273          */
 274         writel(SPRD_THM_INT_CLR_MASK, thm->base + SPRD_THM_INT_CLR);
 275         sprd_thm_update_bits(thm->base + SPRD_THM_INT_EN,
 276                              SPRD_THM_BIT_INT_EN, SPRD_THM_BIT_INT_EN);
 277         sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
 278                              SPRD_THM_EN, SPRD_THM_EN);
 279         return 0;
 280 }
 281
 282 static void sprd_thm_sensor_init(struct sprd_thermal_data *thm,
 283                                  struct sprd_thermal_sensor *sen)
 284 {
 285         u32 otp_rawdata, hot_rawdata;
 286
 287         otp_rawdata = sprd_thm_temp_to_rawdata(SPRD_THM_OTP_TEMP, sen);
 288         hot_rawdata = sprd_thm_temp_to_rawdata(SPRD_THM_HOT_TEMP, sen);
 289
 290         /* Enable the sensor' overheat temperature protection interrupt */
 291         sprd_thm_update_bits(thm->base + SPRD_THM_INT_EN,
 292                              SPRD_THM_SEN_OVERHEAT_ALARM_EN(sen->id),
 293                              SPRD_THM_SEN_OVERHEAT_ALARM_EN(sen->id));
 294
 295         /* Set the sensor' overheat and hot threshold temperature */
 296         sprd_thm_update_bits(thm->base + SPRD_THM_THRES(sen->id),
 297                              SPRD_THM_THRES_MASK,
 298                              (otp_rawdata << SPRD_THM_OTP_TRIP_SHIFT) |
 299                              hot_rawdata);
 300
 301         /* Enable the corresponding sensor */
 302         sprd_thm_update_bits(thm->base + SPRD_THM_CTL, SPRD_THM_SEN(sen->id),
 303                              SPRD_THM_SEN(sen->id));
 304 }
 305
 306 static void sprd_thm_para_config(struct sprd_thermal_data *thm)
 307 {
 308         /* Set the period of two valid temperature detection action */
 309         sprd_thm_update_bits(thm->base + SPRD_THM_DET_PERIOD,
 310                              SPRD_THM_DET_PERIOD_MASK, SPRD_THM_DET_PERIOD);
 311
 312         /* Set the sensors' monitor mode */
 313         sprd_thm_update_bits(thm->base + SPRD_THM_MON_CTL,
 314                              SPRD_THM_MON_MODE_MASK, SPRD_THM_MON_MODE);
 315
 316         /* Set the sensors' monitor period */
 317         sprd_thm_update_bits(thm->base + SPRD_THM_MON_PERIOD,
 318                              SPRD_THM_MON_PERIOD_MASK, SPRD_THM_MON_PERIOD);
 319 }
 320
 321 static void sprd_thm_toggle_sensor(struct sprd_thermal_sensor *sen, bool on)
 322 {
 323         struct thermal_zone_device *tzd = sen->tzd;
 324
 325         tzd->ops->set_mode(tzd,
 326                 on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
 327 }
 328
 329 static int sprd_thm_probe(struct platform_device *pdev)
 330 {
 331         struct device_node *np = pdev->dev.of_node;
 332         struct device_node *sen_child;
 333         struct sprd_thermal_data *thm;
 334         struct sprd_thermal_sensor *sen;
 335         const struct sprd_thm_variant_data *pdata;
 336         int ret, i;
 337         u32 val;
 338
 339         pdata = of_device_get_match_data(&pdev->dev);
 340         if (!pdata) {
 341                 dev_err(&pdev->dev, "No matching driver data found\n");
 342                 return -EINVAL;
 343         }
 344
 345         thm = devm_kzalloc(&pdev->dev, sizeof(*thm), GFP_KERNEL);
 346         if (!thm)
 347                 return -ENOMEM;
 348
 349         thm->var_data = pdata;
 350         thm->base = devm_platform_ioremap_resource(pdev, 0);
 351         if (!thm->base)
 352                 return -ENOMEM;
 353
 354         thm->nr_sensors = of_get_child_count(np);
 355         if (thm->nr_sensors == 0 || thm->nr_sensors > SPRD_THM_MAX_SENSOR) {
 356                 dev_err(&pdev->dev, "incorrect sensor count\n");
 357                 return -EINVAL;
 358         }
 359
 360         thm->clk = devm_clk_get(&pdev->dev, "enable");
 361         if (IS_ERR(thm->clk)) {
 362                 dev_err(&pdev->dev, "failed to get enable clock\n");
 363                 return PTR_ERR(thm->clk);
 364         }
 365
 366         ret = clk_prepare_enable(thm->clk);
 367         if (ret)
 368                 return ret;
 369
 370         sprd_thm_para_config(thm);
 371
 372         ret = sprd_thm_cal_read(np, "thm_sign_cal", &val);
 373         if (ret)
 374                 goto disable_clk;
 375
 376         if (val > 0)
 377                 thm->ratio_sign = -1;
 378         else
 379                 thm->ratio_sign = 1;
 380
 381         ret = sprd_thm_cal_read(np, "thm_ratio_cal", &thm->ratio_off);
 382         if (ret)
 383                 goto disable_clk;
 384
 385         for_each_child_of_node(np, sen_child) {
 386                 sen = devm_kzalloc(&pdev->dev, sizeof(*sen), GFP_KERNEL);
 387                 if (!sen) {
 388                         ret = -ENOMEM;
 389                         goto disable_clk;
 390                 }
 391
 392                 sen->data = thm;
 393                 sen->dev = &pdev->dev;
 394
 395                 ret = of_property_read_u32(sen_child, "reg", &sen->id);
 396                 if (ret) {
 397                         dev_err(&pdev->dev, "get sensor reg failed");
 398                         goto disable_clk;
 399                 }
 400
 401                 ret = sprd_thm_sensor_calibration(sen_child, thm, sen);
 402                 if (ret) {
 403                         dev_err(&pdev->dev, "efuse cal analysis failed");
 404                         goto disable_clk;
 405                 }
 406
 407                 sprd_thm_sensor_init(thm, sen);
 408
 409                 sen->tzd = devm_thermal_zone_of_sensor_register(sen->dev,
 410                                                                 sen->id,
 411                                                                 sen,
 412                                                                 &sprd_thm_ops);
 413                 if (IS_ERR(sen->tzd)) {
 414                         dev_err(&pdev->dev, "register thermal zone failed %d\n",
 415                                 sen->id);
 416                         ret = PTR_ERR(sen->tzd);
 417                         goto disable_clk;
 418                 }
 419
 420                 thm->sensor[sen->id] = sen;
 421         }
 422
 423         ret = sprd_thm_set_ready(thm);
 424         if (ret)
 425                 goto disable_clk;
 426
 427         ret = sprd_thm_wait_temp_ready(thm);
 428         if (ret)
 429                 goto disable_clk;
 430
 431         for (i = 0; i < thm->nr_sensors; i++)
 432                 sprd_thm_toggle_sensor(thm->sensor[i], true);
 433
 434         platform_set_drvdata(pdev, thm);
 435         return 0;
 436
 437 disable_clk:
 438         clk_disable_unprepare(thm->clk);
 439         return ret;
 440 }
 441
 442 #ifdef CONFIG_PM_SLEEP
 443 static void sprd_thm_hw_suspend(struct sprd_thermal_data *thm)
 444 {
 445         int i;
 446
 447         for (i = 0; i < thm->nr_sensors; i++) {
 448                 sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
 449                                      SPRD_THM_SEN(thm->sensor[i]->id), 0);
 450         }
 451
 452         sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
 453                              SPRD_THM_EN, 0x0);
 454 }
 455
 456 static int sprd_thm_suspend(struct device *dev)
 457 {
 458         struct sprd_thermal_data *thm = dev_get_drvdata(dev);
 459         int i;
 460
 461         for (i = 0; i < thm->nr_sensors; i++)
 462                 sprd_thm_toggle_sensor(thm->sensor[i], false);
 463
 464         sprd_thm_hw_suspend(thm);
 465         clk_disable_unprepare(thm->clk);
 466
 467         return 0;
 468 }
 469
 470 static int sprd_thm_hw_resume(struct sprd_thermal_data *thm)
 471 {
 472         int ret, i;
 473
 474         for (i = 0; i < thm->nr_sensors; i++) {
 475                 sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
 476                                      SPRD_THM_SEN(thm->sensor[i]->id),
 477                                      SPRD_THM_SEN(thm->sensor[i]->id));
 478         }
 479
 480         ret = sprd_thm_poll_ready_status(thm);
 481         if (ret)
 482                 return ret;
 483
 484         writel(SPRD_THM_INT_CLR_MASK, thm->base + SPRD_THM_INT_CLR);
 485         sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
 486                              SPRD_THM_EN, SPRD_THM_EN);
 487         return sprd_thm_wait_temp_ready(thm);
 488 }
 489
 490 static int sprd_thm_resume(struct device *dev)
 491 {
 492         struct sprd_thermal_data *thm = dev_get_drvdata(dev);
 493         int ret, i;
 494
 495         ret = clk_prepare_enable(thm->clk);
 496         if (ret)
 497                 return ret;
 498
 499         ret = sprd_thm_hw_resume(thm);
 500         if (ret)
 501                 goto disable_clk;
 502
 503         for (i = 0; i < thm->nr_sensors; i++)
 504                 sprd_thm_toggle_sensor(thm->sensor[i], true);
 505
 506         return 0;
 507
 508 disable_clk:
 509         clk_disable_unprepare(thm->clk);
 510         return ret;
 511 }
 512 #endif
 513
 514 static int sprd_thm_remove(struct platform_device *pdev)
 515 {
 516         struct sprd_thermal_data *thm = platform_get_drvdata(pdev);
 517         int i;
 518
 519         for (i = 0; i < thm->nr_sensors; i++) {
 520                 sprd_thm_toggle_sensor(thm->sensor[i], false);
 521                 devm_thermal_zone_of_sensor_unregister(&pdev->dev,
 522                                                        thm->sensor[i]->tzd);
 523         }
 524
 525         clk_disable_unprepare(thm->clk);
 526         return 0;
 527 }
 528
 529 static const struct of_device_id sprd_thermal_of_match[] = {
 530         { .compatible = "sprd,ums512-thermal", .data = &ums512_data },
 531         { },
 532 };
 533
 534 static const struct dev_pm_ops sprd_thermal_pm_ops = {
 535         SET_SYSTEM_SLEEP_PM_OPS(sprd_thm_suspend, sprd_thm_resume)
 536 };
 537
 538 static struct platform_driver sprd_thermal_driver = {
 539         .probe = sprd_thm_probe,
 540         .remove = sprd_thm_remove,
 541         .driver = {
 542                 .name = "sprd-thermal",
 543                 .pm = &sprd_thermal_pm_ops,
 544                 .of_match_table = sprd_thermal_of_match,
 545         },
 546 };
 547
 548 module_platform_driver(sprd_thermal_driver);
 549
 550 MODULE_AUTHOR("Freeman Liu <freeman.liu@unisoc.com>");
 551 MODULE_DESCRIPTION("Spreadtrum thermal driver");
 552 MODULE_LICENSE("GPL v2");