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