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 = thermal_zone_device_priv(tz); 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 return -EAGAIN; 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 == trips[IMX_TRIP_PASSIVE].temperature && 283 *temp >= trips[IMX_TRIP_PASSIVE].temperature) 284 imx_set_alarm_temp(data, trips[IMX_TRIP_CRITICAL].temperature); 285 if (data->alarm_temp == trips[IMX_TRIP_CRITICAL].temperature && 286 *temp < trips[IMX_TRIP_PASSIVE].temperature) { 287 imx_set_alarm_temp(data, trips[IMX_TRIP_PASSIVE].temperature); 288 dev_dbg(data->dev, "thermal alarm off: T < %d\n", 289 data->alarm_temp / 1000); 290 } 291 } 292 293 if (*temp != data->last_temp) { 294 dev_dbg(data->dev, "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 = thermal_zone_device_priv(tz); 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_set_trip_temp(struct thermal_zone_device *tz, int trip_id, 334 int temp) 335 { 336 struct imx_thermal_data *data = thermal_zone_device_priv(tz); 337 struct thermal_trip trip; 338 int ret; 339 340 ret = pm_runtime_resume_and_get(data->dev); 341 if (ret < 0) 342 return ret; 343 344 ret = __thermal_zone_get_trip(tz, trip_id, &trip); 345 if (ret) 346 return ret; 347 348 /* do not allow changing critical threshold */ 349 if (trip.type == THERMAL_TRIP_CRITICAL) 350 return -EPERM; 351 352 /* do not allow passive to be set higher than critical */ 353 if (temp < 0 || temp > trips[IMX_TRIP_CRITICAL].temperature) 354 return -EINVAL; 355 356 imx_set_alarm_temp(data, temp); 357 358 pm_runtime_put(data->dev); 359 360 return 0; 361 } 362 363 static int imx_bind(struct thermal_zone_device *tz, 364 struct thermal_cooling_device *cdev) 365 { 366 return thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, 367 THERMAL_NO_LIMIT, 368 THERMAL_NO_LIMIT, 369 THERMAL_WEIGHT_DEFAULT); 370 } 371 372 static int imx_unbind(struct thermal_zone_device *tz, 373 struct thermal_cooling_device *cdev) 374 { 375 return thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); 376 } 377 378 static struct thermal_zone_device_ops imx_tz_ops = { 379 .bind = imx_bind, 380 .unbind = imx_unbind, 381 .get_temp = imx_get_temp, 382 .change_mode = imx_change_mode, 383 .set_trip_temp = imx_set_trip_temp, 384 }; 385 386 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) 387 { 388 struct imx_thermal_data *data = platform_get_drvdata(pdev); 389 int n1; 390 u64 temp64; 391 392 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { 393 dev_err(&pdev->dev, "invalid sensor calibration data\n"); 394 return -EINVAL; 395 } 396 397 /* 398 * On i.MX7D, we only use the calibration data at 25C to get the temp, 399 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. 400 */ 401 if (data->socdata->version == TEMPMON_IMX7D) { 402 data->c1 = (ocotp_ana1 >> 9) & 0x1ff; 403 return 0; 404 } 405 406 /* 407 * The sensor is calibrated at 25 °C (aka T1) and the value measured 408 * (aka N1) at this temperature is provided in bits [31:20] in the 409 * i.MX's OCOTP value ANA1. 410 * To find the actual temperature T, the following formula has to be used 411 * when reading value n from the sensor: 412 * 413 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C 414 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C 415 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C 416 * = c2 - c1 * N 417 * 418 * with 419 * 420 * T1' = 28.580661 °C 421 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C 422 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C 423 * = T1' + N1 * c1 424 */ 425 n1 = ocotp_ana1 >> 20; 426 427 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ 428 temp64 *= 1000; /* to get result in °mC */ 429 do_div(temp64, 15423 * n1 - 4148468); 430 data->c1 = temp64; 431 data->c2 = n1 * data->c1 + 28581; 432 433 return 0; 434 } 435 436 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) 437 { 438 struct imx_thermal_data *data = platform_get_drvdata(pdev); 439 440 /* The maximum die temp is specified by the Temperature Grade */ 441 switch ((ocotp_mem0 >> 6) & 0x3) { 442 case 0: /* Commercial (0 to 95 °C) */ 443 data->temp_grade = "Commercial"; 444 data->temp_max = 95000; 445 break; 446 case 1: /* Extended Commercial (-20 °C to 105 °C) */ 447 data->temp_grade = "Extended Commercial"; 448 data->temp_max = 105000; 449 break; 450 case 2: /* Industrial (-40 °C to 105 °C) */ 451 data->temp_grade = "Industrial"; 452 data->temp_max = 105000; 453 break; 454 case 3: /* Automotive (-40 °C to 125 °C) */ 455 data->temp_grade = "Automotive"; 456 data->temp_max = 125000; 457 break; 458 } 459 460 /* 461 * Set the critical trip point at 5 °C under max 462 * Set the passive trip point at 10 °C under max (changeable via sysfs) 463 */ 464 trips[IMX_TRIP_PASSIVE].temperature = data->temp_max - (1000 * 10); 465 trips[IMX_TRIP_CRITICAL].temperature = data->temp_max - (1000 * 5); 466 } 467 468 static int imx_init_from_tempmon_data(struct platform_device *pdev) 469 { 470 struct regmap *map; 471 int ret; 472 u32 val; 473 474 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, 475 "fsl,tempmon-data"); 476 if (IS_ERR(map)) { 477 ret = PTR_ERR(map); 478 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); 479 return ret; 480 } 481 482 ret = regmap_read(map, OCOTP_ANA1, &val); 483 if (ret) { 484 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 485 return ret; 486 } 487 ret = imx_init_calib(pdev, val); 488 if (ret) 489 return ret; 490 491 ret = regmap_read(map, OCOTP_MEM0, &val); 492 if (ret) { 493 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 494 return ret; 495 } 496 imx_init_temp_grade(pdev, val); 497 498 return 0; 499 } 500 501 static int imx_init_from_nvmem_cells(struct platform_device *pdev) 502 { 503 int ret; 504 u32 val; 505 506 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); 507 if (ret) 508 return ret; 509 510 ret = imx_init_calib(pdev, val); 511 if (ret) 512 return ret; 513 514 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); 515 if (ret) 516 return ret; 517 imx_init_temp_grade(pdev, val); 518 519 return 0; 520 } 521 522 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) 523 { 524 struct imx_thermal_data *data = dev; 525 526 disable_irq_nosync(irq); 527 data->irq_enabled = false; 528 529 return IRQ_WAKE_THREAD; 530 } 531 532 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) 533 { 534 struct imx_thermal_data *data = dev; 535 536 dev_dbg(data->dev, "THERMAL ALARM: T > %d\n", data->alarm_temp / 1000); 537 538 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); 539 540 return IRQ_HANDLED; 541 } 542 543 static const struct of_device_id of_imx_thermal_match[] = { 544 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, }, 545 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, }, 546 { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, }, 547 { /* end */ } 548 }; 549 MODULE_DEVICE_TABLE(of, of_imx_thermal_match); 550 551 #ifdef CONFIG_CPU_FREQ 552 /* 553 * Create cooling device in case no #cooling-cells property is available in 554 * CPU node 555 */ 556 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 557 { 558 struct device_node *np; 559 int ret = 0; 560 561 data->policy = cpufreq_cpu_get(0); 562 if (!data->policy) { 563 pr_debug("%s: CPUFreq policy not found\n", __func__); 564 return -EPROBE_DEFER; 565 } 566 567 np = of_get_cpu_node(data->policy->cpu, NULL); 568 569 if (!np || !of_property_present(np, "#cooling-cells")) { 570 data->cdev = cpufreq_cooling_register(data->policy); 571 if (IS_ERR(data->cdev)) { 572 ret = PTR_ERR(data->cdev); 573 cpufreq_cpu_put(data->policy); 574 } 575 } 576 577 of_node_put(np); 578 579 return ret; 580 } 581 582 static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 583 { 584 cpufreq_cooling_unregister(data->cdev); 585 cpufreq_cpu_put(data->policy); 586 } 587 588 #else 589 590 static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 591 { 592 return 0; 593 } 594 595 static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 596 { 597 } 598 #endif 599 600 static int imx_thermal_probe(struct platform_device *pdev) 601 { 602 struct imx_thermal_data *data; 603 struct regmap *map; 604 int measure_freq; 605 int ret; 606 607 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 608 if (!data) 609 return -ENOMEM; 610 611 data->dev = &pdev->dev; 612 613 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); 614 if (IS_ERR(map)) { 615 ret = PTR_ERR(map); 616 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); 617 return ret; 618 } 619 data->tempmon = map; 620 621 data->socdata = of_device_get_match_data(&pdev->dev); 622 if (!data->socdata) { 623 dev_err(&pdev->dev, "no device match found\n"); 624 return -ENODEV; 625 } 626 627 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ 628 if (data->socdata->version == TEMPMON_IMX6SX) { 629 regmap_write(map, IMX6_MISC1 + REG_CLR, 630 IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW 631 | IMX6_MISC1_IRQ_TEMPPANIC); 632 /* 633 * reset value of LOW ALARM is incorrect, set it to lowest 634 * value to avoid false trigger of low alarm. 635 */ 636 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET, 637 data->socdata->low_alarm_mask); 638 } 639 640 data->irq = platform_get_irq(pdev, 0); 641 if (data->irq < 0) 642 return data->irq; 643 644 platform_set_drvdata(pdev, data); 645 646 if (of_property_present(pdev->dev.of_node, "nvmem-cells")) { 647 ret = imx_init_from_nvmem_cells(pdev); 648 if (ret) 649 return dev_err_probe(&pdev->dev, ret, 650 "failed to init from nvmem\n"); 651 } else { 652 ret = imx_init_from_tempmon_data(pdev); 653 if (ret) { 654 dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n"); 655 return ret; 656 } 657 } 658 659 /* Make sure sensor is in known good state for measurements */ 660 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 661 data->socdata->power_down_mask); 662 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 663 data->socdata->measure_temp_mask); 664 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, 665 data->socdata->measure_freq_mask); 666 if (data->socdata->version != TEMPMON_IMX7D) 667 regmap_write(map, IMX6_MISC0 + REG_SET, 668 IMX6_MISC0_REFTOP_SELBIASOFF); 669 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 670 data->socdata->power_down_mask); 671 672 ret = imx_thermal_register_legacy_cooling(data); 673 if (ret) 674 return dev_err_probe(&pdev->dev, ret, 675 "failed to register cpufreq cooling device\n"); 676 677 data->thermal_clk = devm_clk_get(&pdev->dev, NULL); 678 if (IS_ERR(data->thermal_clk)) { 679 ret = PTR_ERR(data->thermal_clk); 680 if (ret != -EPROBE_DEFER) 681 dev_err(&pdev->dev, 682 "failed to get thermal clk: %d\n", ret); 683 goto legacy_cleanup; 684 } 685 686 /* 687 * Thermal sensor needs clk on to get correct value, normally 688 * we should enable its clk before taking measurement and disable 689 * clk after measurement is done, but if alarm function is enabled, 690 * hardware will auto measure the temperature periodically, so we 691 * need to keep the clk always on for alarm function. 692 */ 693 ret = clk_prepare_enable(data->thermal_clk); 694 if (ret) { 695 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); 696 goto legacy_cleanup; 697 } 698 699 data->tz = thermal_zone_device_register_with_trips("imx_thermal_zone", 700 trips, 701 ARRAY_SIZE(trips), 702 BIT(IMX_TRIP_PASSIVE), data, 703 &imx_tz_ops, NULL, 704 IMX_PASSIVE_DELAY, 705 IMX_POLLING_DELAY); 706 if (IS_ERR(data->tz)) { 707 ret = PTR_ERR(data->tz); 708 dev_err(&pdev->dev, 709 "failed to register thermal zone device %d\n", ret); 710 goto clk_disable; 711 } 712 713 dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" 714 " critical:%dC passive:%dC\n", data->temp_grade, 715 data->temp_max / 1000, trips[IMX_TRIP_CRITICAL].temperature / 1000, 716 trips[IMX_TRIP_PASSIVE].temperature / 1000); 717 718 /* Enable measurements at ~ 10 Hz */ 719 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, 720 data->socdata->measure_freq_mask); 721 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ 722 regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET, 723 measure_freq << data->socdata->measure_freq_shift); 724 imx_set_alarm_temp(data, trips[IMX_TRIP_PASSIVE].temperature); 725 726 if (data->socdata->version == TEMPMON_IMX6SX) 727 imx_set_panic_temp(data, trips[IMX_TRIP_CRITICAL].temperature); 728 729 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 730 data->socdata->power_down_mask); 731 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 732 data->socdata->measure_temp_mask); 733 /* After power up, we need a delay before first access can be done. */ 734 usleep_range(20, 50); 735 736 /* the core was configured and enabled just before */ 737 pm_runtime_set_active(&pdev->dev); 738 pm_runtime_enable(data->dev); 739 740 ret = pm_runtime_resume_and_get(data->dev); 741 if (ret < 0) 742 goto disable_runtime_pm; 743 744 data->irq_enabled = true; 745 ret = thermal_zone_device_enable(data->tz); 746 if (ret) 747 goto thermal_zone_unregister; 748 749 ret = devm_request_threaded_irq(&pdev->dev, data->irq, 750 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, 751 0, "imx_thermal", data); 752 if (ret < 0) { 753 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); 754 goto thermal_zone_unregister; 755 } 756 757 pm_runtime_put(data->dev); 758 759 return 0; 760 761 thermal_zone_unregister: 762 thermal_zone_device_unregister(data->tz); 763 disable_runtime_pm: 764 pm_runtime_put_noidle(data->dev); 765 pm_runtime_disable(data->dev); 766 clk_disable: 767 clk_disable_unprepare(data->thermal_clk); 768 legacy_cleanup: 769 imx_thermal_unregister_legacy_cooling(data); 770 771 return ret; 772 } 773 774 static int imx_thermal_remove(struct platform_device *pdev) 775 { 776 struct imx_thermal_data *data = platform_get_drvdata(pdev); 777 778 pm_runtime_put_noidle(data->dev); 779 pm_runtime_disable(data->dev); 780 781 thermal_zone_device_unregister(data->tz); 782 imx_thermal_unregister_legacy_cooling(data); 783 784 return 0; 785 } 786 787 static int __maybe_unused imx_thermal_suspend(struct device *dev) 788 { 789 struct imx_thermal_data *data = dev_get_drvdata(dev); 790 int ret; 791 792 /* 793 * Need to disable thermal sensor, otherwise, when thermal core 794 * try to get temperature before thermal sensor resume, a wrong 795 * temperature will be read as the thermal sensor is powered 796 * down. This is done in change_mode() operation called from 797 * thermal_zone_device_disable() 798 */ 799 ret = thermal_zone_device_disable(data->tz); 800 if (ret) 801 return ret; 802 803 return pm_runtime_force_suspend(data->dev); 804 } 805 806 static int __maybe_unused imx_thermal_resume(struct device *dev) 807 { 808 struct imx_thermal_data *data = dev_get_drvdata(dev); 809 int ret; 810 811 ret = pm_runtime_force_resume(data->dev); 812 if (ret) 813 return ret; 814 /* Enabled thermal sensor after resume */ 815 return thermal_zone_device_enable(data->tz); 816 } 817 818 static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev) 819 { 820 struct imx_thermal_data *data = dev_get_drvdata(dev); 821 const struct thermal_soc_data *socdata = data->socdata; 822 struct regmap *map = data->tempmon; 823 int ret; 824 825 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, 826 socdata->measure_temp_mask); 827 if (ret) 828 return ret; 829 830 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, 831 socdata->power_down_mask); 832 if (ret) 833 return ret; 834 835 clk_disable_unprepare(data->thermal_clk); 836 837 return 0; 838 } 839 840 static int __maybe_unused imx_thermal_runtime_resume(struct device *dev) 841 { 842 struct imx_thermal_data *data = dev_get_drvdata(dev); 843 const struct thermal_soc_data *socdata = data->socdata; 844 struct regmap *map = data->tempmon; 845 int ret; 846 847 ret = clk_prepare_enable(data->thermal_clk); 848 if (ret) 849 return ret; 850 851 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, 852 socdata->power_down_mask); 853 if (ret) 854 return ret; 855 856 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, 857 socdata->measure_temp_mask); 858 if (ret) 859 return ret; 860 861 /* 862 * According to the temp sensor designers, it may require up to ~17us 863 * to complete a measurement. 864 */ 865 usleep_range(20, 50); 866 867 return 0; 868 } 869 870 static const struct dev_pm_ops imx_thermal_pm_ops = { 871 SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume) 872 SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend, 873 imx_thermal_runtime_resume, NULL) 874 }; 875 876 static struct platform_driver imx_thermal = { 877 .driver = { 878 .name = "imx_thermal", 879 .pm = &imx_thermal_pm_ops, 880 .of_match_table = of_imx_thermal_match, 881 }, 882 .probe = imx_thermal_probe, 883 .remove = imx_thermal_remove, 884 }; 885 module_platform_driver(imx_thermal); 886 887 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 888 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); 889 MODULE_LICENSE("GPL v2"); 890 MODULE_ALIAS("platform:imx-thermal"); 891