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 struct regmap *tempmon; 201 u32 c1, c2; /* See formula in imx_init_calib() */ 202 int temp_passive; 203 int temp_critical; 204 int temp_max; 205 int alarm_temp; 206 int last_temp; 207 bool irq_enabled; 208 int irq; 209 struct clk *thermal_clk; 210 const struct thermal_soc_data *socdata; 211 const char *temp_grade; 212 }; 213 214 static void imx_set_panic_temp(struct imx_thermal_data *data, 215 int panic_temp) 216 { 217 const struct thermal_soc_data *soc_data = data->socdata; 218 struct regmap *map = data->tempmon; 219 int critical_value; 220 221 critical_value = (data->c2 - panic_temp) / data->c1; 222 223 regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR, 224 soc_data->panic_alarm_mask); 225 regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET, 226 critical_value << soc_data->panic_alarm_shift); 227 } 228 229 static void imx_set_alarm_temp(struct imx_thermal_data *data, 230 int alarm_temp) 231 { 232 struct regmap *map = data->tempmon; 233 const struct thermal_soc_data *soc_data = data->socdata; 234 int alarm_value; 235 236 data->alarm_temp = alarm_temp; 237 238 if (data->socdata->version == TEMPMON_IMX7D) 239 alarm_value = alarm_temp / 1000 + data->c1 - 25; 240 else 241 alarm_value = (data->c2 - alarm_temp) / data->c1; 242 243 regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR, 244 soc_data->high_alarm_mask); 245 regmap_write(map, soc_data->high_alarm_ctrl + REG_SET, 246 alarm_value << soc_data->high_alarm_shift); 247 } 248 249 static int imx_get_temp(struct thermal_zone_device *tz, int *temp) 250 { 251 struct imx_thermal_data *data = tz->devdata; 252 const struct thermal_soc_data *soc_data = data->socdata; 253 struct regmap *map = data->tempmon; 254 unsigned int n_meas; 255 bool wait, run_measurement; 256 u32 val; 257 258 run_measurement = !data->irq_enabled; 259 if (!run_measurement) { 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 (run_measurement) { 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_change_mode(struct thermal_zone_device *tz, 335 enum thermal_device_mode mode) 336 { 337 struct imx_thermal_data *data = tz->devdata; 338 struct regmap *map = data->tempmon; 339 const struct thermal_soc_data *soc_data = data->socdata; 340 341 if (mode == THERMAL_DEVICE_ENABLED) { 342 regmap_write(map, soc_data->sensor_ctrl + REG_CLR, 343 soc_data->power_down_mask); 344 regmap_write(map, soc_data->sensor_ctrl + REG_SET, 345 soc_data->measure_temp_mask); 346 347 if (!data->irq_enabled) { 348 data->irq_enabled = true; 349 enable_irq(data->irq); 350 } 351 } else { 352 regmap_write(map, soc_data->sensor_ctrl + REG_CLR, 353 soc_data->measure_temp_mask); 354 regmap_write(map, soc_data->sensor_ctrl + REG_SET, 355 soc_data->power_down_mask); 356 357 if (data->irq_enabled) { 358 disable_irq(data->irq); 359 data->irq_enabled = false; 360 } 361 } 362 363 return 0; 364 } 365 366 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, 367 enum thermal_trip_type *type) 368 { 369 *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE : 370 THERMAL_TRIP_CRITICAL; 371 return 0; 372 } 373 374 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp) 375 { 376 struct imx_thermal_data *data = tz->devdata; 377 378 *temp = data->temp_critical; 379 return 0; 380 } 381 382 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, 383 int *temp) 384 { 385 struct imx_thermal_data *data = tz->devdata; 386 387 *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive : 388 data->temp_critical; 389 return 0; 390 } 391 392 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, 393 int temp) 394 { 395 struct imx_thermal_data *data = tz->devdata; 396 397 /* do not allow changing critical threshold */ 398 if (trip == IMX_TRIP_CRITICAL) 399 return -EPERM; 400 401 /* do not allow passive to be set higher than critical */ 402 if (temp < 0 || temp > data->temp_critical) 403 return -EINVAL; 404 405 data->temp_passive = temp; 406 407 imx_set_alarm_temp(data, temp); 408 409 return 0; 410 } 411 412 static int imx_bind(struct thermal_zone_device *tz, 413 struct thermal_cooling_device *cdev) 414 { 415 int ret; 416 417 ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, 418 THERMAL_NO_LIMIT, 419 THERMAL_NO_LIMIT, 420 THERMAL_WEIGHT_DEFAULT); 421 if (ret) { 422 dev_err(&tz->device, 423 "binding zone %s with cdev %s failed:%d\n", 424 tz->type, cdev->type, ret); 425 return ret; 426 } 427 428 return 0; 429 } 430 431 static int imx_unbind(struct thermal_zone_device *tz, 432 struct thermal_cooling_device *cdev) 433 { 434 int ret; 435 436 ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); 437 if (ret) { 438 dev_err(&tz->device, 439 "unbinding zone %s with cdev %s failed:%d\n", 440 tz->type, cdev->type, ret); 441 return ret; 442 } 443 444 return 0; 445 } 446 447 static struct thermal_zone_device_ops imx_tz_ops = { 448 .bind = imx_bind, 449 .unbind = imx_unbind, 450 .get_temp = imx_get_temp, 451 .change_mode = imx_change_mode, 452 .get_trip_type = imx_get_trip_type, 453 .get_trip_temp = imx_get_trip_temp, 454 .get_crit_temp = imx_get_crit_temp, 455 .set_trip_temp = imx_set_trip_temp, 456 }; 457 458 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) 459 { 460 struct imx_thermal_data *data = platform_get_drvdata(pdev); 461 int n1; 462 u64 temp64; 463 464 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { 465 dev_err(&pdev->dev, "invalid sensor calibration data\n"); 466 return -EINVAL; 467 } 468 469 /* 470 * On i.MX7D, we only use the calibration data at 25C to get the temp, 471 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. 472 */ 473 if (data->socdata->version == TEMPMON_IMX7D) { 474 data->c1 = (ocotp_ana1 >> 9) & 0x1ff; 475 return 0; 476 } 477 478 /* 479 * The sensor is calibrated at 25 °C (aka T1) and the value measured 480 * (aka N1) at this temperature is provided in bits [31:20] in the 481 * i.MX's OCOTP value ANA1. 482 * To find the actual temperature T, the following formula has to be used 483 * when reading value n from the sensor: 484 * 485 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C 486 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C 487 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C 488 * = c2 - c1 * N 489 * 490 * with 491 * 492 * T1' = 28.580661 °C 493 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C 494 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C 495 * = T1' + N1 * c1 496 */ 497 n1 = ocotp_ana1 >> 20; 498 499 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ 500 temp64 *= 1000; /* to get result in °mC */ 501 do_div(temp64, 15423 * n1 - 4148468); 502 data->c1 = temp64; 503 data->c2 = n1 * data->c1 + 28581; 504 505 return 0; 506 } 507 508 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) 509 { 510 struct imx_thermal_data *data = platform_get_drvdata(pdev); 511 512 /* The maximum die temp is specified by the Temperature Grade */ 513 switch ((ocotp_mem0 >> 6) & 0x3) { 514 case 0: /* Commercial (0 to 95 °C) */ 515 data->temp_grade = "Commercial"; 516 data->temp_max = 95000; 517 break; 518 case 1: /* Extended Commercial (-20 °C to 105 °C) */ 519 data->temp_grade = "Extended Commercial"; 520 data->temp_max = 105000; 521 break; 522 case 2: /* Industrial (-40 °C to 105 °C) */ 523 data->temp_grade = "Industrial"; 524 data->temp_max = 105000; 525 break; 526 case 3: /* Automotive (-40 °C to 125 °C) */ 527 data->temp_grade = "Automotive"; 528 data->temp_max = 125000; 529 break; 530 } 531 532 /* 533 * Set the critical trip point at 5 °C under max 534 * Set the passive trip point at 10 °C under max (changeable via sysfs) 535 */ 536 data->temp_critical = data->temp_max - (1000 * 5); 537 data->temp_passive = data->temp_max - (1000 * 10); 538 } 539 540 static int imx_init_from_tempmon_data(struct platform_device *pdev) 541 { 542 struct regmap *map; 543 int ret; 544 u32 val; 545 546 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, 547 "fsl,tempmon-data"); 548 if (IS_ERR(map)) { 549 ret = PTR_ERR(map); 550 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); 551 return ret; 552 } 553 554 ret = regmap_read(map, OCOTP_ANA1, &val); 555 if (ret) { 556 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 557 return ret; 558 } 559 ret = imx_init_calib(pdev, val); 560 if (ret) 561 return ret; 562 563 ret = regmap_read(map, OCOTP_MEM0, &val); 564 if (ret) { 565 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 566 return ret; 567 } 568 imx_init_temp_grade(pdev, val); 569 570 return 0; 571 } 572 573 static int imx_init_from_nvmem_cells(struct platform_device *pdev) 574 { 575 int ret; 576 u32 val; 577 578 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); 579 if (ret) 580 return ret; 581 582 ret = imx_init_calib(pdev, val); 583 if (ret) 584 return ret; 585 586 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); 587 if (ret) 588 return ret; 589 imx_init_temp_grade(pdev, val); 590 591 return 0; 592 } 593 594 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) 595 { 596 struct imx_thermal_data *data = dev; 597 598 disable_irq_nosync(irq); 599 data->irq_enabled = false; 600 601 return IRQ_WAKE_THREAD; 602 } 603 604 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) 605 { 606 struct imx_thermal_data *data = dev; 607 608 dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n", 609 data->alarm_temp / 1000); 610 611 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); 612 613 return IRQ_HANDLED; 614 } 615 616 static const struct of_device_id of_imx_thermal_match[] = { 617 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, }, 618 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, }, 619 { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, }, 620 { /* end */ } 621 }; 622 MODULE_DEVICE_TABLE(of, of_imx_thermal_match); 623 624 #ifdef CONFIG_CPU_FREQ 625 /* 626 * Create cooling device in case no #cooling-cells property is available in 627 * CPU node 628 */ 629 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 630 { 631 struct device_node *np; 632 int ret = 0; 633 634 data->policy = cpufreq_cpu_get(0); 635 if (!data->policy) { 636 pr_debug("%s: CPUFreq policy not found\n", __func__); 637 return -EPROBE_DEFER; 638 } 639 640 np = of_get_cpu_node(data->policy->cpu, NULL); 641 642 if (!np || !of_find_property(np, "#cooling-cells", NULL)) { 643 data->cdev = cpufreq_cooling_register(data->policy); 644 if (IS_ERR(data->cdev)) { 645 ret = PTR_ERR(data->cdev); 646 cpufreq_cpu_put(data->policy); 647 } 648 } 649 650 of_node_put(np); 651 652 return ret; 653 } 654 655 static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 656 { 657 cpufreq_cooling_unregister(data->cdev); 658 cpufreq_cpu_put(data->policy); 659 } 660 661 #else 662 663 static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 664 { 665 return 0; 666 } 667 668 static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 669 { 670 } 671 #endif 672 673 static int imx_thermal_probe(struct platform_device *pdev) 674 { 675 struct imx_thermal_data *data; 676 struct regmap *map; 677 int measure_freq; 678 int ret; 679 680 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 681 if (!data) 682 return -ENOMEM; 683 684 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); 685 if (IS_ERR(map)) { 686 ret = PTR_ERR(map); 687 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); 688 return ret; 689 } 690 data->tempmon = map; 691 692 data->socdata = of_device_get_match_data(&pdev->dev); 693 if (!data->socdata) { 694 dev_err(&pdev->dev, "no device match found\n"); 695 return -ENODEV; 696 } 697 698 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ 699 if (data->socdata->version == TEMPMON_IMX6SX) { 700 regmap_write(map, IMX6_MISC1 + REG_CLR, 701 IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW 702 | IMX6_MISC1_IRQ_TEMPPANIC); 703 /* 704 * reset value of LOW ALARM is incorrect, set it to lowest 705 * value to avoid false trigger of low alarm. 706 */ 707 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET, 708 data->socdata->low_alarm_mask); 709 } 710 711 data->irq = platform_get_irq(pdev, 0); 712 if (data->irq < 0) 713 return data->irq; 714 715 platform_set_drvdata(pdev, data); 716 717 if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) { 718 ret = imx_init_from_nvmem_cells(pdev); 719 if (ret) 720 return dev_err_probe(&pdev->dev, ret, 721 "failed to init from nvmem\n"); 722 } else { 723 ret = imx_init_from_tempmon_data(pdev); 724 if (ret) { 725 dev_err(&pdev->dev, "failed to init 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 ret = imx_thermal_register_legacy_cooling(data); 744 if (ret) 745 return dev_err_probe(&pdev->dev, ret, 746 "failed to register cpufreq cooling device\n"); 747 748 data->thermal_clk = devm_clk_get(&pdev->dev, NULL); 749 if (IS_ERR(data->thermal_clk)) { 750 ret = PTR_ERR(data->thermal_clk); 751 if (ret != -EPROBE_DEFER) 752 dev_err(&pdev->dev, 753 "failed to get thermal clk: %d\n", ret); 754 goto legacy_cleanup; 755 } 756 757 /* 758 * Thermal sensor needs clk on to get correct value, normally 759 * we should enable its clk before taking measurement and disable 760 * clk after measurement is done, but if alarm function is enabled, 761 * hardware will auto measure the temperature periodically, so we 762 * need to keep the clk always on for alarm function. 763 */ 764 ret = clk_prepare_enable(data->thermal_clk); 765 if (ret) { 766 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); 767 goto legacy_cleanup; 768 } 769 770 data->tz = thermal_zone_device_register("imx_thermal_zone", 771 IMX_TRIP_NUM, 772 BIT(IMX_TRIP_PASSIVE), data, 773 &imx_tz_ops, NULL, 774 IMX_PASSIVE_DELAY, 775 IMX_POLLING_DELAY); 776 if (IS_ERR(data->tz)) { 777 ret = PTR_ERR(data->tz); 778 dev_err(&pdev->dev, 779 "failed to register thermal zone device %d\n", ret); 780 goto clk_disable; 781 } 782 783 dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" 784 " critical:%dC passive:%dC\n", data->temp_grade, 785 data->temp_max / 1000, data->temp_critical / 1000, 786 data->temp_passive / 1000); 787 788 /* Enable measurements at ~ 10 Hz */ 789 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, 790 data->socdata->measure_freq_mask); 791 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ 792 regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET, 793 measure_freq << data->socdata->measure_freq_shift); 794 imx_set_alarm_temp(data, data->temp_passive); 795 796 if (data->socdata->version == TEMPMON_IMX6SX) 797 imx_set_panic_temp(data, data->temp_critical); 798 799 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 800 data->socdata->power_down_mask); 801 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 802 data->socdata->measure_temp_mask); 803 804 data->irq_enabled = true; 805 ret = thermal_zone_device_enable(data->tz); 806 if (ret) 807 goto thermal_zone_unregister; 808 809 ret = devm_request_threaded_irq(&pdev->dev, data->irq, 810 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, 811 0, "imx_thermal", data); 812 if (ret < 0) { 813 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); 814 goto thermal_zone_unregister; 815 } 816 817 return 0; 818 819 thermal_zone_unregister: 820 thermal_zone_device_unregister(data->tz); 821 clk_disable: 822 clk_disable_unprepare(data->thermal_clk); 823 legacy_cleanup: 824 imx_thermal_unregister_legacy_cooling(data); 825 826 return ret; 827 } 828 829 static int imx_thermal_remove(struct platform_device *pdev) 830 { 831 struct imx_thermal_data *data = platform_get_drvdata(pdev); 832 struct regmap *map = data->tempmon; 833 834 /* Disable measurements */ 835 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 836 data->socdata->power_down_mask); 837 if (!IS_ERR(data->thermal_clk)) 838 clk_disable_unprepare(data->thermal_clk); 839 840 thermal_zone_device_unregister(data->tz); 841 imx_thermal_unregister_legacy_cooling(data); 842 843 return 0; 844 } 845 846 static int __maybe_unused imx_thermal_suspend(struct device *dev) 847 { 848 struct imx_thermal_data *data = dev_get_drvdata(dev); 849 int ret; 850 851 /* 852 * Need to disable thermal sensor, otherwise, when thermal core 853 * try to get temperature before thermal sensor resume, a wrong 854 * temperature will be read as the thermal sensor is powered 855 * down. This is done in change_mode() operation called from 856 * thermal_zone_device_disable() 857 */ 858 ret = thermal_zone_device_disable(data->tz); 859 if (ret) 860 return ret; 861 clk_disable_unprepare(data->thermal_clk); 862 863 return 0; 864 } 865 866 static int __maybe_unused imx_thermal_resume(struct device *dev) 867 { 868 struct imx_thermal_data *data = dev_get_drvdata(dev); 869 int ret; 870 871 ret = clk_prepare_enable(data->thermal_clk); 872 if (ret) 873 return ret; 874 /* Enabled thermal sensor after resume */ 875 ret = thermal_zone_device_enable(data->tz); 876 if (ret) 877 return ret; 878 879 return 0; 880 } 881 882 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, 883 imx_thermal_suspend, imx_thermal_resume); 884 885 static struct platform_driver imx_thermal = { 886 .driver = { 887 .name = "imx_thermal", 888 .pm = &imx_thermal_pm_ops, 889 .of_match_table = of_imx_thermal_match, 890 }, 891 .probe = imx_thermal_probe, 892 .remove = imx_thermal_remove, 893 }; 894 module_platform_driver(imx_thermal); 895 896 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 897 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); 898 MODULE_LICENSE("GPL v2"); 899 MODULE_ALIAS("platform:imx-thermal"); 900