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