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