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/of_device.h> 15 #include <linux/regmap.h> 16 #include <linux/thermal.h> 17 #include <linux/nvmem-consumer.h> 18 19 #define REG_SET 0x4 20 #define REG_CLR 0x8 21 #define REG_TOG 0xc 22 23 /* i.MX6 specific */ 24 #define IMX6_MISC0 0x0150 25 #define IMX6_MISC0_REFTOP_SELBIASOFF (1 << 3) 26 #define IMX6_MISC1 0x0160 27 #define IMX6_MISC1_IRQ_TEMPHIGH (1 << 29) 28 /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */ 29 #define IMX6_MISC1_IRQ_TEMPLOW (1 << 28) 30 #define IMX6_MISC1_IRQ_TEMPPANIC (1 << 27) 31 32 #define IMX6_TEMPSENSE0 0x0180 33 #define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT 20 34 #define IMX6_TEMPSENSE0_ALARM_VALUE_MASK (0xfff << 20) 35 #define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT 8 36 #define IMX6_TEMPSENSE0_TEMP_CNT_MASK (0xfff << 8) 37 #define IMX6_TEMPSENSE0_FINISHED (1 << 2) 38 #define IMX6_TEMPSENSE0_MEASURE_TEMP (1 << 1) 39 #define IMX6_TEMPSENSE0_POWER_DOWN (1 << 0) 40 41 #define IMX6_TEMPSENSE1 0x0190 42 #define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff 43 #define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0 44 45 #define OCOTP_MEM0 0x0480 46 #define OCOTP_ANA1 0x04e0 47 48 /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */ 49 #define IMX6_TEMPSENSE2 0x0290 50 #define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT 0 51 #define IMX6_TEMPSENSE2_LOW_VALUE_MASK 0xfff 52 #define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT 16 53 #define IMX6_TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000 54 55 /* i.MX7 specific */ 56 #define IMX7_ANADIG_DIGPROG 0x800 57 #define IMX7_TEMPSENSE0 0x300 58 #define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT 18 59 #define IMX7_TEMPSENSE0_PANIC_ALARM_MASK (0x1ff << 18) 60 #define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT 9 61 #define IMX7_TEMPSENSE0_HIGH_ALARM_MASK (0x1ff << 9) 62 #define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT 0 63 #define IMX7_TEMPSENSE0_LOW_ALARM_MASK 0x1ff 64 65 #define IMX7_TEMPSENSE1 0x310 66 #define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT 16 67 #define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK (0xffff << 16) 68 #define IMX7_TEMPSENSE1_FINISHED (1 << 11) 69 #define IMX7_TEMPSENSE1_MEASURE_TEMP (1 << 10) 70 #define IMX7_TEMPSENSE1_POWER_DOWN (1 << 9) 71 #define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT 0 72 #define IMX7_TEMPSENSE1_TEMP_VALUE_MASK 0x1ff 73 74 /* The driver supports 1 passive trip point and 1 critical trip point */ 75 enum imx_thermal_trip { 76 IMX_TRIP_PASSIVE, 77 IMX_TRIP_CRITICAL, 78 IMX_TRIP_NUM, 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_soc_data thermal_imx6q_data = { 118 .version = TEMPMON_IMX6Q, 119 120 .sensor_ctrl = IMX6_TEMPSENSE0, 121 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, 122 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, 123 124 .measure_freq_ctrl = IMX6_TEMPSENSE1, 125 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, 126 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, 127 128 .temp_data = IMX6_TEMPSENSE0, 129 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, 130 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, 131 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, 132 133 .high_alarm_ctrl = IMX6_TEMPSENSE0, 134 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, 135 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, 136 }; 137 138 static struct thermal_soc_data thermal_imx6sx_data = { 139 .version = TEMPMON_IMX6SX, 140 141 .sensor_ctrl = IMX6_TEMPSENSE0, 142 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, 143 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, 144 145 .measure_freq_ctrl = IMX6_TEMPSENSE1, 146 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, 147 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, 148 149 .temp_data = IMX6_TEMPSENSE0, 150 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, 151 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, 152 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, 153 154 .high_alarm_ctrl = IMX6_TEMPSENSE0, 155 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, 156 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, 157 158 .panic_alarm_ctrl = IMX6_TEMPSENSE2, 159 .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK, 160 .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT, 161 162 .low_alarm_ctrl = IMX6_TEMPSENSE2, 163 .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK, 164 .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT, 165 }; 166 167 static struct thermal_soc_data thermal_imx7d_data = { 168 .version = TEMPMON_IMX7D, 169 170 .sensor_ctrl = IMX7_TEMPSENSE1, 171 .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN, 172 .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP, 173 174 .measure_freq_ctrl = IMX7_TEMPSENSE1, 175 .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT, 176 .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK, 177 178 .temp_data = IMX7_TEMPSENSE1, 179 .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK, 180 .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT, 181 .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED, 182 183 .panic_alarm_ctrl = IMX7_TEMPSENSE1, 184 .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK, 185 .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT, 186 187 .high_alarm_ctrl = IMX7_TEMPSENSE0, 188 .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK, 189 .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT, 190 191 .low_alarm_ctrl = IMX7_TEMPSENSE0, 192 .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK, 193 .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT, 194 }; 195 196 struct imx_thermal_data { 197 struct cpufreq_policy *policy; 198 struct thermal_zone_device *tz; 199 struct thermal_cooling_device *cdev; 200 enum thermal_device_mode mode; 201 struct regmap *tempmon; 202 u32 c1, c2; /* See formula in imx_init_calib() */ 203 int temp_passive; 204 int temp_critical; 205 int temp_max; 206 int alarm_temp; 207 int last_temp; 208 bool irq_enabled; 209 int irq; 210 struct clk *thermal_clk; 211 const struct thermal_soc_data *socdata; 212 const char *temp_grade; 213 }; 214 215 static void imx_set_panic_temp(struct imx_thermal_data *data, 216 int panic_temp) 217 { 218 const struct thermal_soc_data *soc_data = data->socdata; 219 struct regmap *map = data->tempmon; 220 int critical_value; 221 222 critical_value = (data->c2 - panic_temp) / data->c1; 223 224 regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR, 225 soc_data->panic_alarm_mask); 226 regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET, 227 critical_value << soc_data->panic_alarm_shift); 228 } 229 230 static void imx_set_alarm_temp(struct imx_thermal_data *data, 231 int alarm_temp) 232 { 233 struct regmap *map = data->tempmon; 234 const struct thermal_soc_data *soc_data = data->socdata; 235 int alarm_value; 236 237 data->alarm_temp = alarm_temp; 238 239 if (data->socdata->version == TEMPMON_IMX7D) 240 alarm_value = alarm_temp / 1000 + data->c1 - 25; 241 else 242 alarm_value = (data->c2 - alarm_temp) / data->c1; 243 244 regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR, 245 soc_data->high_alarm_mask); 246 regmap_write(map, soc_data->high_alarm_ctrl + REG_SET, 247 alarm_value << soc_data->high_alarm_shift); 248 } 249 250 static int imx_get_temp(struct thermal_zone_device *tz, int *temp) 251 { 252 struct imx_thermal_data *data = tz->devdata; 253 const struct thermal_soc_data *soc_data = data->socdata; 254 struct regmap *map = data->tempmon; 255 unsigned int n_meas; 256 bool wait; 257 u32 val; 258 259 if (data->mode == THERMAL_DEVICE_ENABLED) { 260 /* Check if a measurement is currently in progress */ 261 regmap_read(map, soc_data->temp_data, &val); 262 wait = !(val & soc_data->temp_valid_mask); 263 } else { 264 /* 265 * Every time we measure the temperature, we will power on the 266 * temperature sensor, enable measurements, take a reading, 267 * disable measurements, power off the temperature sensor. 268 */ 269 regmap_write(map, soc_data->sensor_ctrl + REG_CLR, 270 soc_data->power_down_mask); 271 regmap_write(map, soc_data->sensor_ctrl + REG_SET, 272 soc_data->measure_temp_mask); 273 274 wait = true; 275 } 276 277 /* 278 * According to the temp sensor designers, it may require up to ~17us 279 * to complete a measurement. 280 */ 281 if (wait) 282 usleep_range(20, 50); 283 284 regmap_read(map, soc_data->temp_data, &val); 285 286 if (data->mode != THERMAL_DEVICE_ENABLED) { 287 regmap_write(map, soc_data->sensor_ctrl + REG_CLR, 288 soc_data->measure_temp_mask); 289 regmap_write(map, soc_data->sensor_ctrl + REG_SET, 290 soc_data->power_down_mask); 291 } 292 293 if ((val & soc_data->temp_valid_mask) == 0) { 294 dev_dbg(&tz->device, "temp measurement never finished\n"); 295 return -EAGAIN; 296 } 297 298 n_meas = (val & soc_data->temp_value_mask) 299 >> soc_data->temp_value_shift; 300 301 /* See imx_init_calib() for formula derivation */ 302 if (data->socdata->version == TEMPMON_IMX7D) 303 *temp = (n_meas - data->c1 + 25) * 1000; 304 else 305 *temp = data->c2 - n_meas * data->c1; 306 307 /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */ 308 if (data->socdata->version == TEMPMON_IMX6Q) { 309 if (data->alarm_temp == data->temp_passive && 310 *temp >= data->temp_passive) 311 imx_set_alarm_temp(data, data->temp_critical); 312 if (data->alarm_temp == data->temp_critical && 313 *temp < data->temp_passive) { 314 imx_set_alarm_temp(data, data->temp_passive); 315 dev_dbg(&tz->device, "thermal alarm off: T < %d\n", 316 data->alarm_temp / 1000); 317 } 318 } 319 320 if (*temp != data->last_temp) { 321 dev_dbg(&tz->device, "millicelsius: %d\n", *temp); 322 data->last_temp = *temp; 323 } 324 325 /* Reenable alarm IRQ if temperature below alarm temperature */ 326 if (!data->irq_enabled && *temp < data->alarm_temp) { 327 data->irq_enabled = true; 328 enable_irq(data->irq); 329 } 330 331 return 0; 332 } 333 334 static int imx_get_mode(struct thermal_zone_device *tz, 335 enum thermal_device_mode *mode) 336 { 337 struct imx_thermal_data *data = tz->devdata; 338 339 *mode = data->mode; 340 341 return 0; 342 } 343 344 static int imx_set_mode(struct thermal_zone_device *tz, 345 enum thermal_device_mode mode) 346 { 347 struct imx_thermal_data *data = tz->devdata; 348 struct regmap *map = data->tempmon; 349 const struct thermal_soc_data *soc_data = data->socdata; 350 351 if (mode == THERMAL_DEVICE_ENABLED) { 352 tz->polling_delay = IMX_POLLING_DELAY; 353 tz->passive_delay = IMX_PASSIVE_DELAY; 354 355 regmap_write(map, soc_data->sensor_ctrl + REG_CLR, 356 soc_data->power_down_mask); 357 regmap_write(map, soc_data->sensor_ctrl + REG_SET, 358 soc_data->measure_temp_mask); 359 360 if (!data->irq_enabled) { 361 data->irq_enabled = true; 362 enable_irq(data->irq); 363 } 364 } else { 365 regmap_write(map, soc_data->sensor_ctrl + REG_CLR, 366 soc_data->measure_temp_mask); 367 regmap_write(map, soc_data->sensor_ctrl + REG_SET, 368 soc_data->power_down_mask); 369 370 tz->polling_delay = 0; 371 tz->passive_delay = 0; 372 373 if (data->irq_enabled) { 374 disable_irq(data->irq); 375 data->irq_enabled = false; 376 } 377 } 378 379 data->mode = mode; 380 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); 381 382 return 0; 383 } 384 385 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, 386 enum thermal_trip_type *type) 387 { 388 *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE : 389 THERMAL_TRIP_CRITICAL; 390 return 0; 391 } 392 393 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp) 394 { 395 struct imx_thermal_data *data = tz->devdata; 396 397 *temp = data->temp_critical; 398 return 0; 399 } 400 401 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, 402 int *temp) 403 { 404 struct imx_thermal_data *data = tz->devdata; 405 406 *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive : 407 data->temp_critical; 408 return 0; 409 } 410 411 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, 412 int temp) 413 { 414 struct imx_thermal_data *data = tz->devdata; 415 416 /* do not allow changing critical threshold */ 417 if (trip == IMX_TRIP_CRITICAL) 418 return -EPERM; 419 420 /* do not allow passive to be set higher than critical */ 421 if (temp < 0 || temp > data->temp_critical) 422 return -EINVAL; 423 424 data->temp_passive = temp; 425 426 imx_set_alarm_temp(data, temp); 427 428 return 0; 429 } 430 431 static int imx_bind(struct thermal_zone_device *tz, 432 struct thermal_cooling_device *cdev) 433 { 434 int ret; 435 436 ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, 437 THERMAL_NO_LIMIT, 438 THERMAL_NO_LIMIT, 439 THERMAL_WEIGHT_DEFAULT); 440 if (ret) { 441 dev_err(&tz->device, 442 "binding zone %s with cdev %s failed:%d\n", 443 tz->type, cdev->type, ret); 444 return ret; 445 } 446 447 return 0; 448 } 449 450 static int imx_unbind(struct thermal_zone_device *tz, 451 struct thermal_cooling_device *cdev) 452 { 453 int ret; 454 455 ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); 456 if (ret) { 457 dev_err(&tz->device, 458 "unbinding zone %s with cdev %s failed:%d\n", 459 tz->type, cdev->type, ret); 460 return ret; 461 } 462 463 return 0; 464 } 465 466 static struct thermal_zone_device_ops imx_tz_ops = { 467 .bind = imx_bind, 468 .unbind = imx_unbind, 469 .get_temp = imx_get_temp, 470 .get_mode = imx_get_mode, 471 .set_mode = imx_set_mode, 472 .get_trip_type = imx_get_trip_type, 473 .get_trip_temp = imx_get_trip_temp, 474 .get_crit_temp = imx_get_crit_temp, 475 .set_trip_temp = imx_set_trip_temp, 476 }; 477 478 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) 479 { 480 struct imx_thermal_data *data = platform_get_drvdata(pdev); 481 int n1; 482 u64 temp64; 483 484 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { 485 dev_err(&pdev->dev, "invalid sensor calibration data\n"); 486 return -EINVAL; 487 } 488 489 /* 490 * On i.MX7D, we only use the calibration data at 25C to get the temp, 491 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. 492 */ 493 if (data->socdata->version == TEMPMON_IMX7D) { 494 data->c1 = (ocotp_ana1 >> 9) & 0x1ff; 495 return 0; 496 } 497 498 /* 499 * The sensor is calibrated at 25 °C (aka T1) and the value measured 500 * (aka N1) at this temperature is provided in bits [31:20] in the 501 * i.MX's OCOTP value ANA1. 502 * To find the actual temperature T, the following formula has to be used 503 * when reading value n from the sensor: 504 * 505 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C 506 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C 507 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C 508 * = c2 - c1 * N 509 * 510 * with 511 * 512 * T1' = 28.580661 °C 513 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C 514 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C 515 * = T1' + N1 * c1 516 */ 517 n1 = ocotp_ana1 >> 20; 518 519 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ 520 temp64 *= 1000; /* to get result in °mC */ 521 do_div(temp64, 15423 * n1 - 4148468); 522 data->c1 = temp64; 523 data->c2 = n1 * data->c1 + 28581; 524 525 return 0; 526 } 527 528 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) 529 { 530 struct imx_thermal_data *data = platform_get_drvdata(pdev); 531 532 /* The maximum die temp is specified by the Temperature Grade */ 533 switch ((ocotp_mem0 >> 6) & 0x3) { 534 case 0: /* Commercial (0 to 95 °C) */ 535 data->temp_grade = "Commercial"; 536 data->temp_max = 95000; 537 break; 538 case 1: /* Extended Commercial (-20 °C to 105 °C) */ 539 data->temp_grade = "Extended Commercial"; 540 data->temp_max = 105000; 541 break; 542 case 2: /* Industrial (-40 °C to 105 °C) */ 543 data->temp_grade = "Industrial"; 544 data->temp_max = 105000; 545 break; 546 case 3: /* Automotive (-40 °C to 125 °C) */ 547 data->temp_grade = "Automotive"; 548 data->temp_max = 125000; 549 break; 550 } 551 552 /* 553 * Set the critical trip point at 5 °C under max 554 * Set the passive trip point at 10 °C under max (changeable via sysfs) 555 */ 556 data->temp_critical = data->temp_max - (1000 * 5); 557 data->temp_passive = data->temp_max - (1000 * 10); 558 } 559 560 static int imx_init_from_tempmon_data(struct platform_device *pdev) 561 { 562 struct regmap *map; 563 int ret; 564 u32 val; 565 566 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, 567 "fsl,tempmon-data"); 568 if (IS_ERR(map)) { 569 ret = PTR_ERR(map); 570 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); 571 return ret; 572 } 573 574 ret = regmap_read(map, OCOTP_ANA1, &val); 575 if (ret) { 576 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 577 return ret; 578 } 579 ret = imx_init_calib(pdev, val); 580 if (ret) 581 return ret; 582 583 ret = regmap_read(map, OCOTP_MEM0, &val); 584 if (ret) { 585 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 586 return ret; 587 } 588 imx_init_temp_grade(pdev, val); 589 590 return 0; 591 } 592 593 static int imx_init_from_nvmem_cells(struct platform_device *pdev) 594 { 595 int ret; 596 u32 val; 597 598 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); 599 if (ret) 600 return ret; 601 602 ret = imx_init_calib(pdev, val); 603 if (ret) 604 return ret; 605 606 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); 607 if (ret) 608 return ret; 609 imx_init_temp_grade(pdev, val); 610 611 return 0; 612 } 613 614 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) 615 { 616 struct imx_thermal_data *data = dev; 617 618 disable_irq_nosync(irq); 619 data->irq_enabled = false; 620 621 return IRQ_WAKE_THREAD; 622 } 623 624 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) 625 { 626 struct imx_thermal_data *data = dev; 627 628 dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n", 629 data->alarm_temp / 1000); 630 631 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); 632 633 return IRQ_HANDLED; 634 } 635 636 static const struct of_device_id of_imx_thermal_match[] = { 637 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, }, 638 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, }, 639 { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, }, 640 { /* end */ } 641 }; 642 MODULE_DEVICE_TABLE(of, of_imx_thermal_match); 643 644 #ifdef CONFIG_CPU_FREQ 645 /* 646 * Create cooling device in case no #cooling-cells property is available in 647 * CPU node 648 */ 649 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 650 { 651 struct device_node *np; 652 int ret; 653 654 data->policy = cpufreq_cpu_get(0); 655 if (!data->policy) { 656 pr_debug("%s: CPUFreq policy not found\n", __func__); 657 return -EPROBE_DEFER; 658 } 659 660 np = of_get_cpu_node(data->policy->cpu, NULL); 661 662 if (!np || !of_find_property(np, "#cooling-cells", NULL)) { 663 data->cdev = cpufreq_cooling_register(data->policy); 664 if (IS_ERR(data->cdev)) { 665 ret = PTR_ERR(data->cdev); 666 cpufreq_cpu_put(data->policy); 667 return ret; 668 } 669 } 670 671 return 0; 672 } 673 674 static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 675 { 676 cpufreq_cooling_unregister(data->cdev); 677 cpufreq_cpu_put(data->policy); 678 } 679 680 #else 681 682 static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 683 { 684 return 0; 685 } 686 687 static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 688 { 689 } 690 #endif 691 692 static int imx_thermal_probe(struct platform_device *pdev) 693 { 694 struct imx_thermal_data *data; 695 struct regmap *map; 696 int measure_freq; 697 int ret; 698 699 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 700 if (!data) 701 return -ENOMEM; 702 703 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); 704 if (IS_ERR(map)) { 705 ret = PTR_ERR(map); 706 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); 707 return ret; 708 } 709 data->tempmon = map; 710 711 data->socdata = of_device_get_match_data(&pdev->dev); 712 if (!data->socdata) { 713 dev_err(&pdev->dev, "no device match found\n"); 714 return -ENODEV; 715 } 716 717 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ 718 if (data->socdata->version == TEMPMON_IMX6SX) { 719 regmap_write(map, IMX6_MISC1 + REG_CLR, 720 IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW 721 | IMX6_MISC1_IRQ_TEMPPANIC); 722 /* 723 * reset value of LOW ALARM is incorrect, set it to lowest 724 * value to avoid false trigger of low alarm. 725 */ 726 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET, 727 data->socdata->low_alarm_mask); 728 } 729 730 data->irq = platform_get_irq(pdev, 0); 731 if (data->irq < 0) 732 return data->irq; 733 734 platform_set_drvdata(pdev, data); 735 736 if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) { 737 ret = imx_init_from_nvmem_cells(pdev); 738 if (ret) { 739 if (ret == -EPROBE_DEFER) 740 return ret; 741 742 dev_err(&pdev->dev, "failed to init from nvmem: %d\n", 743 ret); 744 return ret; 745 } 746 } else { 747 ret = imx_init_from_tempmon_data(pdev); 748 if (ret) { 749 dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n"); 750 return ret; 751 } 752 } 753 754 /* Make sure sensor is in known good state for measurements */ 755 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 756 data->socdata->power_down_mask); 757 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 758 data->socdata->measure_temp_mask); 759 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, 760 data->socdata->measure_freq_mask); 761 if (data->socdata->version != TEMPMON_IMX7D) 762 regmap_write(map, IMX6_MISC0 + REG_SET, 763 IMX6_MISC0_REFTOP_SELBIASOFF); 764 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 765 data->socdata->power_down_mask); 766 767 ret = imx_thermal_register_legacy_cooling(data); 768 if (ret) { 769 if (ret == -EPROBE_DEFER) 770 return ret; 771 772 dev_err(&pdev->dev, 773 "failed to register cpufreq cooling device: %d\n", ret); 774 return ret; 775 } 776 777 data->thermal_clk = devm_clk_get(&pdev->dev, NULL); 778 if (IS_ERR(data->thermal_clk)) { 779 ret = PTR_ERR(data->thermal_clk); 780 if (ret != -EPROBE_DEFER) 781 dev_err(&pdev->dev, 782 "failed to get thermal clk: %d\n", ret); 783 goto legacy_cleanup; 784 } 785 786 /* 787 * Thermal sensor needs clk on to get correct value, normally 788 * we should enable its clk before taking measurement and disable 789 * clk after measurement is done, but if alarm function is enabled, 790 * hardware will auto measure the temperature periodically, so we 791 * need to keep the clk always on for alarm function. 792 */ 793 ret = clk_prepare_enable(data->thermal_clk); 794 if (ret) { 795 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); 796 goto legacy_cleanup; 797 } 798 799 data->tz = thermal_zone_device_register("imx_thermal_zone", 800 IMX_TRIP_NUM, 801 BIT(IMX_TRIP_PASSIVE), data, 802 &imx_tz_ops, NULL, 803 IMX_PASSIVE_DELAY, 804 IMX_POLLING_DELAY); 805 if (IS_ERR(data->tz)) { 806 ret = PTR_ERR(data->tz); 807 dev_err(&pdev->dev, 808 "failed to register thermal zone device %d\n", ret); 809 goto clk_disable; 810 } 811 812 dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" 813 " critical:%dC passive:%dC\n", data->temp_grade, 814 data->temp_max / 1000, data->temp_critical / 1000, 815 data->temp_passive / 1000); 816 817 /* Enable measurements at ~ 10 Hz */ 818 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, 819 data->socdata->measure_freq_mask); 820 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ 821 regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET, 822 measure_freq << data->socdata->measure_freq_shift); 823 imx_set_alarm_temp(data, data->temp_passive); 824 825 if (data->socdata->version == TEMPMON_IMX6SX) 826 imx_set_panic_temp(data, data->temp_critical); 827 828 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 829 data->socdata->power_down_mask); 830 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 831 data->socdata->measure_temp_mask); 832 833 data->irq_enabled = true; 834 data->mode = THERMAL_DEVICE_ENABLED; 835 836 ret = devm_request_threaded_irq(&pdev->dev, data->irq, 837 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, 838 0, "imx_thermal", data); 839 if (ret < 0) { 840 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); 841 goto thermal_zone_unregister; 842 } 843 844 return 0; 845 846 thermal_zone_unregister: 847 thermal_zone_device_unregister(data->tz); 848 clk_disable: 849 clk_disable_unprepare(data->thermal_clk); 850 legacy_cleanup: 851 imx_thermal_unregister_legacy_cooling(data); 852 853 return ret; 854 } 855 856 static int imx_thermal_remove(struct platform_device *pdev) 857 { 858 struct imx_thermal_data *data = platform_get_drvdata(pdev); 859 struct regmap *map = data->tempmon; 860 861 /* Disable measurements */ 862 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 863 data->socdata->power_down_mask); 864 if (!IS_ERR(data->thermal_clk)) 865 clk_disable_unprepare(data->thermal_clk); 866 867 thermal_zone_device_unregister(data->tz); 868 imx_thermal_unregister_legacy_cooling(data); 869 870 return 0; 871 } 872 873 static int __maybe_unused imx_thermal_suspend(struct device *dev) 874 { 875 struct imx_thermal_data *data = dev_get_drvdata(dev); 876 struct regmap *map = data->tempmon; 877 878 /* 879 * Need to disable thermal sensor, otherwise, when thermal core 880 * try to get temperature before thermal sensor resume, a wrong 881 * temperature will be read as the thermal sensor is powered 882 * down. 883 */ 884 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 885 data->socdata->measure_temp_mask); 886 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 887 data->socdata->power_down_mask); 888 data->mode = THERMAL_DEVICE_DISABLED; 889 clk_disable_unprepare(data->thermal_clk); 890 891 return 0; 892 } 893 894 static int __maybe_unused imx_thermal_resume(struct device *dev) 895 { 896 struct imx_thermal_data *data = dev_get_drvdata(dev); 897 struct regmap *map = data->tempmon; 898 int ret; 899 900 ret = clk_prepare_enable(data->thermal_clk); 901 if (ret) 902 return ret; 903 /* Enabled thermal sensor after resume */ 904 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 905 data->socdata->power_down_mask); 906 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 907 data->socdata->measure_temp_mask); 908 data->mode = THERMAL_DEVICE_ENABLED; 909 910 return 0; 911 } 912 913 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, 914 imx_thermal_suspend, imx_thermal_resume); 915 916 static struct platform_driver imx_thermal = { 917 .driver = { 918 .name = "imx_thermal", 919 .pm = &imx_thermal_pm_ops, 920 .of_match_table = of_imx_thermal_match, 921 }, 922 .probe = imx_thermal_probe, 923 .remove = imx_thermal_remove, 924 }; 925 module_platform_driver(imx_thermal); 926 927 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 928 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); 929 MODULE_LICENSE("GPL v2"); 930 MODULE_ALIAS("platform:imx-thermal"); 931