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 #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 IMX_TRIP_NUM, 80 }; 81 82 #define IMX_POLLING_DELAY 2000 /* millisecond */ 83 #define IMX_PASSIVE_DELAY 1000 84 85 #define TEMPMON_IMX6Q 1 86 #define TEMPMON_IMX6SX 2 87 #define TEMPMON_IMX7D 3 88 89 struct thermal_soc_data { 90 u32 version; 91 92 u32 sensor_ctrl; 93 u32 power_down_mask; 94 u32 measure_temp_mask; 95 96 u32 measure_freq_ctrl; 97 u32 measure_freq_mask; 98 u32 measure_freq_shift; 99 100 u32 temp_data; 101 u32 temp_value_mask; 102 u32 temp_value_shift; 103 u32 temp_valid_mask; 104 105 u32 panic_alarm_ctrl; 106 u32 panic_alarm_mask; 107 u32 panic_alarm_shift; 108 109 u32 high_alarm_ctrl; 110 u32 high_alarm_mask; 111 u32 high_alarm_shift; 112 113 u32 low_alarm_ctrl; 114 u32 low_alarm_mask; 115 u32 low_alarm_shift; 116 }; 117 118 static struct thermal_soc_data thermal_imx6q_data = { 119 .version = TEMPMON_IMX6Q, 120 121 .sensor_ctrl = IMX6_TEMPSENSE0, 122 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, 123 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, 124 125 .measure_freq_ctrl = IMX6_TEMPSENSE1, 126 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, 127 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, 128 129 .temp_data = IMX6_TEMPSENSE0, 130 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, 131 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, 132 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, 133 134 .high_alarm_ctrl = IMX6_TEMPSENSE0, 135 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, 136 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, 137 }; 138 139 static struct thermal_soc_data thermal_imx6sx_data = { 140 .version = TEMPMON_IMX6SX, 141 142 .sensor_ctrl = IMX6_TEMPSENSE0, 143 .power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN, 144 .measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP, 145 146 .measure_freq_ctrl = IMX6_TEMPSENSE1, 147 .measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT, 148 .measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ, 149 150 .temp_data = IMX6_TEMPSENSE0, 151 .temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK, 152 .temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT, 153 .temp_valid_mask = IMX6_TEMPSENSE0_FINISHED, 154 155 .high_alarm_ctrl = IMX6_TEMPSENSE0, 156 .high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK, 157 .high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT, 158 159 .panic_alarm_ctrl = IMX6_TEMPSENSE2, 160 .panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK, 161 .panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT, 162 163 .low_alarm_ctrl = IMX6_TEMPSENSE2, 164 .low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK, 165 .low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT, 166 }; 167 168 static struct thermal_soc_data thermal_imx7d_data = { 169 .version = TEMPMON_IMX7D, 170 171 .sensor_ctrl = IMX7_TEMPSENSE1, 172 .power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN, 173 .measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP, 174 175 .measure_freq_ctrl = IMX7_TEMPSENSE1, 176 .measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT, 177 .measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK, 178 179 .temp_data = IMX7_TEMPSENSE1, 180 .temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK, 181 .temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT, 182 .temp_valid_mask = IMX7_TEMPSENSE1_FINISHED, 183 184 .panic_alarm_ctrl = IMX7_TEMPSENSE1, 185 .panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK, 186 .panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT, 187 188 .high_alarm_ctrl = IMX7_TEMPSENSE0, 189 .high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK, 190 .high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT, 191 192 .low_alarm_ctrl = IMX7_TEMPSENSE0, 193 .low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK, 194 .low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT, 195 }; 196 197 struct imx_thermal_data { 198 struct device *dev; 199 struct cpufreq_policy *policy; 200 struct thermal_zone_device *tz; 201 struct thermal_cooling_device *cdev; 202 struct regmap *tempmon; 203 u32 c1, c2; /* See formula in imx_init_calib() */ 204 int temp_passive; 205 int temp_critical; 206 int temp_max; 207 int alarm_temp; 208 int last_temp; 209 bool irq_enabled; 210 int irq; 211 struct clk *thermal_clk; 212 const struct thermal_soc_data *socdata; 213 const char *temp_grade; 214 }; 215 216 static void imx_set_panic_temp(struct imx_thermal_data *data, 217 int panic_temp) 218 { 219 const struct thermal_soc_data *soc_data = data->socdata; 220 struct regmap *map = data->tempmon; 221 int critical_value; 222 223 critical_value = (data->c2 - panic_temp) / data->c1; 224 225 regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR, 226 soc_data->panic_alarm_mask); 227 regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET, 228 critical_value << soc_data->panic_alarm_shift); 229 } 230 231 static void imx_set_alarm_temp(struct imx_thermal_data *data, 232 int alarm_temp) 233 { 234 struct regmap *map = data->tempmon; 235 const struct thermal_soc_data *soc_data = data->socdata; 236 int alarm_value; 237 238 data->alarm_temp = alarm_temp; 239 240 if (data->socdata->version == TEMPMON_IMX7D) 241 alarm_value = alarm_temp / 1000 + data->c1 - 25; 242 else 243 alarm_value = (data->c2 - alarm_temp) / data->c1; 244 245 regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR, 246 soc_data->high_alarm_mask); 247 regmap_write(map, soc_data->high_alarm_ctrl + REG_SET, 248 alarm_value << soc_data->high_alarm_shift); 249 } 250 251 static int imx_get_temp(struct thermal_zone_device *tz, int *temp) 252 { 253 struct imx_thermal_data *data = tz->devdata; 254 const struct thermal_soc_data *soc_data = data->socdata; 255 struct regmap *map = data->tempmon; 256 unsigned int n_meas; 257 u32 val; 258 int ret; 259 260 ret = pm_runtime_resume_and_get(data->dev); 261 if (ret < 0) 262 return ret; 263 264 regmap_read(map, soc_data->temp_data, &val); 265 266 if ((val & soc_data->temp_valid_mask) == 0) { 267 dev_dbg(&tz->device, "temp measurement never finished\n"); 268 return -EAGAIN; 269 } 270 271 n_meas = (val & soc_data->temp_value_mask) 272 >> soc_data->temp_value_shift; 273 274 /* See imx_init_calib() for formula derivation */ 275 if (data->socdata->version == TEMPMON_IMX7D) 276 *temp = (n_meas - data->c1 + 25) * 1000; 277 else 278 *temp = data->c2 - n_meas * data->c1; 279 280 /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */ 281 if (data->socdata->version == TEMPMON_IMX6Q) { 282 if (data->alarm_temp == data->temp_passive && 283 *temp >= data->temp_passive) 284 imx_set_alarm_temp(data, data->temp_critical); 285 if (data->alarm_temp == data->temp_critical && 286 *temp < data->temp_passive) { 287 imx_set_alarm_temp(data, data->temp_passive); 288 dev_dbg(&tz->device, "thermal alarm off: T < %d\n", 289 data->alarm_temp / 1000); 290 } 291 } 292 293 if (*temp != data->last_temp) { 294 dev_dbg(&tz->device, "millicelsius: %d\n", *temp); 295 data->last_temp = *temp; 296 } 297 298 /* Reenable alarm IRQ if temperature below alarm temperature */ 299 if (!data->irq_enabled && *temp < data->alarm_temp) { 300 data->irq_enabled = true; 301 enable_irq(data->irq); 302 } 303 304 pm_runtime_put(data->dev); 305 306 return 0; 307 } 308 309 static int imx_change_mode(struct thermal_zone_device *tz, 310 enum thermal_device_mode mode) 311 { 312 struct imx_thermal_data *data = tz->devdata; 313 314 if (mode == THERMAL_DEVICE_ENABLED) { 315 pm_runtime_get(data->dev); 316 317 if (!data->irq_enabled) { 318 data->irq_enabled = true; 319 enable_irq(data->irq); 320 } 321 } else { 322 pm_runtime_put(data->dev); 323 324 if (data->irq_enabled) { 325 disable_irq(data->irq); 326 data->irq_enabled = false; 327 } 328 } 329 330 return 0; 331 } 332 333 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, 334 enum thermal_trip_type *type) 335 { 336 *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE : 337 THERMAL_TRIP_CRITICAL; 338 return 0; 339 } 340 341 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp) 342 { 343 struct imx_thermal_data *data = tz->devdata; 344 345 *temp = data->temp_critical; 346 return 0; 347 } 348 349 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, 350 int *temp) 351 { 352 struct imx_thermal_data *data = tz->devdata; 353 354 *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive : 355 data->temp_critical; 356 return 0; 357 } 358 359 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, 360 int temp) 361 { 362 struct imx_thermal_data *data = tz->devdata; 363 int ret; 364 365 ret = pm_runtime_resume_and_get(data->dev); 366 if (ret < 0) 367 return ret; 368 369 /* do not allow changing critical threshold */ 370 if (trip == IMX_TRIP_CRITICAL) 371 return -EPERM; 372 373 /* do not allow passive to be set higher than critical */ 374 if (temp < 0 || temp > data->temp_critical) 375 return -EINVAL; 376 377 data->temp_passive = temp; 378 379 imx_set_alarm_temp(data, temp); 380 381 pm_runtime_put(data->dev); 382 383 return 0; 384 } 385 386 static int imx_bind(struct thermal_zone_device *tz, 387 struct thermal_cooling_device *cdev) 388 { 389 int ret; 390 391 ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, 392 THERMAL_NO_LIMIT, 393 THERMAL_NO_LIMIT, 394 THERMAL_WEIGHT_DEFAULT); 395 if (ret) { 396 dev_err(&tz->device, 397 "binding zone %s with cdev %s failed:%d\n", 398 tz->type, cdev->type, ret); 399 return ret; 400 } 401 402 return 0; 403 } 404 405 static int imx_unbind(struct thermal_zone_device *tz, 406 struct thermal_cooling_device *cdev) 407 { 408 int ret; 409 410 ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); 411 if (ret) { 412 dev_err(&tz->device, 413 "unbinding zone %s with cdev %s failed:%d\n", 414 tz->type, cdev->type, ret); 415 return ret; 416 } 417 418 return 0; 419 } 420 421 static struct thermal_zone_device_ops imx_tz_ops = { 422 .bind = imx_bind, 423 .unbind = imx_unbind, 424 .get_temp = imx_get_temp, 425 .change_mode = imx_change_mode, 426 .get_trip_type = imx_get_trip_type, 427 .get_trip_temp = imx_get_trip_temp, 428 .get_crit_temp = imx_get_crit_temp, 429 .set_trip_temp = imx_set_trip_temp, 430 }; 431 432 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) 433 { 434 struct imx_thermal_data *data = platform_get_drvdata(pdev); 435 int n1; 436 u64 temp64; 437 438 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { 439 dev_err(&pdev->dev, "invalid sensor calibration data\n"); 440 return -EINVAL; 441 } 442 443 /* 444 * On i.MX7D, we only use the calibration data at 25C to get the temp, 445 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. 446 */ 447 if (data->socdata->version == TEMPMON_IMX7D) { 448 data->c1 = (ocotp_ana1 >> 9) & 0x1ff; 449 return 0; 450 } 451 452 /* 453 * The sensor is calibrated at 25 °C (aka T1) and the value measured 454 * (aka N1) at this temperature is provided in bits [31:20] in the 455 * i.MX's OCOTP value ANA1. 456 * To find the actual temperature T, the following formula has to be used 457 * when reading value n from the sensor: 458 * 459 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C 460 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C 461 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C 462 * = c2 - c1 * N 463 * 464 * with 465 * 466 * T1' = 28.580661 °C 467 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C 468 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C 469 * = T1' + N1 * c1 470 */ 471 n1 = ocotp_ana1 >> 20; 472 473 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ 474 temp64 *= 1000; /* to get result in °mC */ 475 do_div(temp64, 15423 * n1 - 4148468); 476 data->c1 = temp64; 477 data->c2 = n1 * data->c1 + 28581; 478 479 return 0; 480 } 481 482 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) 483 { 484 struct imx_thermal_data *data = platform_get_drvdata(pdev); 485 486 /* The maximum die temp is specified by the Temperature Grade */ 487 switch ((ocotp_mem0 >> 6) & 0x3) { 488 case 0: /* Commercial (0 to 95 °C) */ 489 data->temp_grade = "Commercial"; 490 data->temp_max = 95000; 491 break; 492 case 1: /* Extended Commercial (-20 °C to 105 °C) */ 493 data->temp_grade = "Extended Commercial"; 494 data->temp_max = 105000; 495 break; 496 case 2: /* Industrial (-40 °C to 105 °C) */ 497 data->temp_grade = "Industrial"; 498 data->temp_max = 105000; 499 break; 500 case 3: /* Automotive (-40 °C to 125 °C) */ 501 data->temp_grade = "Automotive"; 502 data->temp_max = 125000; 503 break; 504 } 505 506 /* 507 * Set the critical trip point at 5 °C under max 508 * Set the passive trip point at 10 °C under max (changeable via sysfs) 509 */ 510 data->temp_critical = data->temp_max - (1000 * 5); 511 data->temp_passive = data->temp_max - (1000 * 10); 512 } 513 514 static int imx_init_from_tempmon_data(struct platform_device *pdev) 515 { 516 struct regmap *map; 517 int ret; 518 u32 val; 519 520 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, 521 "fsl,tempmon-data"); 522 if (IS_ERR(map)) { 523 ret = PTR_ERR(map); 524 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); 525 return ret; 526 } 527 528 ret = regmap_read(map, OCOTP_ANA1, &val); 529 if (ret) { 530 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 531 return ret; 532 } 533 ret = imx_init_calib(pdev, val); 534 if (ret) 535 return ret; 536 537 ret = regmap_read(map, OCOTP_MEM0, &val); 538 if (ret) { 539 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 540 return ret; 541 } 542 imx_init_temp_grade(pdev, val); 543 544 return 0; 545 } 546 547 static int imx_init_from_nvmem_cells(struct platform_device *pdev) 548 { 549 int ret; 550 u32 val; 551 552 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); 553 if (ret) 554 return ret; 555 556 ret = imx_init_calib(pdev, val); 557 if (ret) 558 return ret; 559 560 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); 561 if (ret) 562 return ret; 563 imx_init_temp_grade(pdev, val); 564 565 return 0; 566 } 567 568 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) 569 { 570 struct imx_thermal_data *data = dev; 571 572 disable_irq_nosync(irq); 573 data->irq_enabled = false; 574 575 return IRQ_WAKE_THREAD; 576 } 577 578 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) 579 { 580 struct imx_thermal_data *data = dev; 581 582 dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n", 583 data->alarm_temp / 1000); 584 585 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); 586 587 return IRQ_HANDLED; 588 } 589 590 static const struct of_device_id of_imx_thermal_match[] = { 591 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, }, 592 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, }, 593 { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, }, 594 { /* end */ } 595 }; 596 MODULE_DEVICE_TABLE(of, of_imx_thermal_match); 597 598 #ifdef CONFIG_CPU_FREQ 599 /* 600 * Create cooling device in case no #cooling-cells property is available in 601 * CPU node 602 */ 603 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 604 { 605 struct device_node *np; 606 int ret = 0; 607 608 data->policy = cpufreq_cpu_get(0); 609 if (!data->policy) { 610 pr_debug("%s: CPUFreq policy not found\n", __func__); 611 return -EPROBE_DEFER; 612 } 613 614 np = of_get_cpu_node(data->policy->cpu, NULL); 615 616 if (!np || !of_find_property(np, "#cooling-cells", NULL)) { 617 data->cdev = cpufreq_cooling_register(data->policy); 618 if (IS_ERR(data->cdev)) { 619 ret = PTR_ERR(data->cdev); 620 cpufreq_cpu_put(data->policy); 621 } 622 } 623 624 of_node_put(np); 625 626 return ret; 627 } 628 629 static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 630 { 631 cpufreq_cooling_unregister(data->cdev); 632 cpufreq_cpu_put(data->policy); 633 } 634 635 #else 636 637 static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 638 { 639 return 0; 640 } 641 642 static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 643 { 644 } 645 #endif 646 647 static int imx_thermal_probe(struct platform_device *pdev) 648 { 649 struct imx_thermal_data *data; 650 struct regmap *map; 651 int measure_freq; 652 int ret; 653 654 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 655 if (!data) 656 return -ENOMEM; 657 658 data->dev = &pdev->dev; 659 660 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); 661 if (IS_ERR(map)) { 662 ret = PTR_ERR(map); 663 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); 664 return ret; 665 } 666 data->tempmon = map; 667 668 data->socdata = of_device_get_match_data(&pdev->dev); 669 if (!data->socdata) { 670 dev_err(&pdev->dev, "no device match found\n"); 671 return -ENODEV; 672 } 673 674 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ 675 if (data->socdata->version == TEMPMON_IMX6SX) { 676 regmap_write(map, IMX6_MISC1 + REG_CLR, 677 IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW 678 | IMX6_MISC1_IRQ_TEMPPANIC); 679 /* 680 * reset value of LOW ALARM is incorrect, set it to lowest 681 * value to avoid false trigger of low alarm. 682 */ 683 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET, 684 data->socdata->low_alarm_mask); 685 } 686 687 data->irq = platform_get_irq(pdev, 0); 688 if (data->irq < 0) 689 return data->irq; 690 691 platform_set_drvdata(pdev, data); 692 693 if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) { 694 ret = imx_init_from_nvmem_cells(pdev); 695 if (ret) 696 return dev_err_probe(&pdev->dev, ret, 697 "failed to init from nvmem\n"); 698 } else { 699 ret = imx_init_from_tempmon_data(pdev); 700 if (ret) { 701 dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n"); 702 return ret; 703 } 704 } 705 706 /* Make sure sensor is in known good state for measurements */ 707 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 708 data->socdata->power_down_mask); 709 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 710 data->socdata->measure_temp_mask); 711 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, 712 data->socdata->measure_freq_mask); 713 if (data->socdata->version != TEMPMON_IMX7D) 714 regmap_write(map, IMX6_MISC0 + REG_SET, 715 IMX6_MISC0_REFTOP_SELBIASOFF); 716 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 717 data->socdata->power_down_mask); 718 719 ret = imx_thermal_register_legacy_cooling(data); 720 if (ret) 721 return dev_err_probe(&pdev->dev, ret, 722 "failed to register cpufreq cooling device\n"); 723 724 data->thermal_clk = devm_clk_get(&pdev->dev, NULL); 725 if (IS_ERR(data->thermal_clk)) { 726 ret = PTR_ERR(data->thermal_clk); 727 if (ret != -EPROBE_DEFER) 728 dev_err(&pdev->dev, 729 "failed to get thermal clk: %d\n", ret); 730 goto legacy_cleanup; 731 } 732 733 /* 734 * Thermal sensor needs clk on to get correct value, normally 735 * we should enable its clk before taking measurement and disable 736 * clk after measurement is done, but if alarm function is enabled, 737 * hardware will auto measure the temperature periodically, so we 738 * need to keep the clk always on for alarm function. 739 */ 740 ret = clk_prepare_enable(data->thermal_clk); 741 if (ret) { 742 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); 743 goto legacy_cleanup; 744 } 745 746 data->tz = thermal_zone_device_register("imx_thermal_zone", 747 IMX_TRIP_NUM, 748 BIT(IMX_TRIP_PASSIVE), data, 749 &imx_tz_ops, NULL, 750 IMX_PASSIVE_DELAY, 751 IMX_POLLING_DELAY); 752 if (IS_ERR(data->tz)) { 753 ret = PTR_ERR(data->tz); 754 dev_err(&pdev->dev, 755 "failed to register thermal zone device %d\n", ret); 756 goto clk_disable; 757 } 758 759 dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" 760 " critical:%dC passive:%dC\n", data->temp_grade, 761 data->temp_max / 1000, data->temp_critical / 1000, 762 data->temp_passive / 1000); 763 764 /* Enable measurements at ~ 10 Hz */ 765 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, 766 data->socdata->measure_freq_mask); 767 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ 768 regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET, 769 measure_freq << data->socdata->measure_freq_shift); 770 imx_set_alarm_temp(data, data->temp_passive); 771 772 if (data->socdata->version == TEMPMON_IMX6SX) 773 imx_set_panic_temp(data, data->temp_critical); 774 775 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 776 data->socdata->power_down_mask); 777 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 778 data->socdata->measure_temp_mask); 779 /* After power up, we need a delay before first access can be done. */ 780 usleep_range(20, 50); 781 782 /* the core was configured and enabled just before */ 783 pm_runtime_set_active(&pdev->dev); 784 pm_runtime_enable(data->dev); 785 786 ret = pm_runtime_resume_and_get(data->dev); 787 if (ret < 0) 788 goto disable_runtime_pm; 789 790 data->irq_enabled = true; 791 ret = thermal_zone_device_enable(data->tz); 792 if (ret) 793 goto thermal_zone_unregister; 794 795 ret = devm_request_threaded_irq(&pdev->dev, data->irq, 796 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, 797 0, "imx_thermal", data); 798 if (ret < 0) { 799 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); 800 goto thermal_zone_unregister; 801 } 802 803 pm_runtime_put(data->dev); 804 805 return 0; 806 807 thermal_zone_unregister: 808 thermal_zone_device_unregister(data->tz); 809 disable_runtime_pm: 810 pm_runtime_put_noidle(data->dev); 811 pm_runtime_disable(data->dev); 812 clk_disable: 813 clk_disable_unprepare(data->thermal_clk); 814 legacy_cleanup: 815 imx_thermal_unregister_legacy_cooling(data); 816 817 return ret; 818 } 819 820 static int imx_thermal_remove(struct platform_device *pdev) 821 { 822 struct imx_thermal_data *data = platform_get_drvdata(pdev); 823 824 pm_runtime_put_noidle(data->dev); 825 pm_runtime_disable(data->dev); 826 827 thermal_zone_device_unregister(data->tz); 828 imx_thermal_unregister_legacy_cooling(data); 829 830 return 0; 831 } 832 833 static int __maybe_unused imx_thermal_suspend(struct device *dev) 834 { 835 struct imx_thermal_data *data = dev_get_drvdata(dev); 836 int ret; 837 838 /* 839 * Need to disable thermal sensor, otherwise, when thermal core 840 * try to get temperature before thermal sensor resume, a wrong 841 * temperature will be read as the thermal sensor is powered 842 * down. This is done in change_mode() operation called from 843 * thermal_zone_device_disable() 844 */ 845 ret = thermal_zone_device_disable(data->tz); 846 if (ret) 847 return ret; 848 849 return pm_runtime_force_suspend(data->dev); 850 } 851 852 static int __maybe_unused imx_thermal_resume(struct device *dev) 853 { 854 struct imx_thermal_data *data = dev_get_drvdata(dev); 855 int ret; 856 857 ret = pm_runtime_force_resume(data->dev); 858 if (ret) 859 return ret; 860 /* Enabled thermal sensor after resume */ 861 return thermal_zone_device_enable(data->tz); 862 } 863 864 static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev) 865 { 866 struct imx_thermal_data *data = dev_get_drvdata(dev); 867 const struct thermal_soc_data *socdata = data->socdata; 868 struct regmap *map = data->tempmon; 869 int ret; 870 871 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, 872 socdata->measure_temp_mask); 873 if (ret) 874 return ret; 875 876 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, 877 socdata->power_down_mask); 878 if (ret) 879 return ret; 880 881 clk_disable_unprepare(data->thermal_clk); 882 883 return 0; 884 } 885 886 static int __maybe_unused imx_thermal_runtime_resume(struct device *dev) 887 { 888 struct imx_thermal_data *data = dev_get_drvdata(dev); 889 const struct thermal_soc_data *socdata = data->socdata; 890 struct regmap *map = data->tempmon; 891 int ret; 892 893 ret = clk_prepare_enable(data->thermal_clk); 894 if (ret) 895 return ret; 896 897 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, 898 socdata->power_down_mask); 899 if (ret) 900 return ret; 901 902 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, 903 socdata->measure_temp_mask); 904 if (ret) 905 return ret; 906 907 /* 908 * According to the temp sensor designers, it may require up to ~17us 909 * to complete a measurement. 910 */ 911 usleep_range(20, 50); 912 913 return 0; 914 } 915 916 static const struct dev_pm_ops imx_thermal_pm_ops = { 917 SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume) 918 SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend, 919 imx_thermal_runtime_resume, NULL) 920 }; 921 922 static struct platform_driver imx_thermal = { 923 .driver = { 924 .name = "imx_thermal", 925 .pm = &imx_thermal_pm_ops, 926 .of_match_table = of_imx_thermal_match, 927 }, 928 .probe = imx_thermal_probe, 929 .remove = imx_thermal_remove, 930 }; 931 module_platform_driver(imx_thermal); 932 933 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 934 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); 935 MODULE_LICENSE("GPL v2"); 936 MODULE_ALIAS("platform:imx-thermal"); 937