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_get_crit_temp(struct thermal_zone_device *tz, int *temp) 334 { 335 *temp = trips[IMX_TRIP_CRITICAL].temperature; 336 337 return 0; 338 } 339 340 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, 341 int temp) 342 { 343 struct imx_thermal_data *data = thermal_zone_device_priv(tz); 344 int ret; 345 346 ret = pm_runtime_resume_and_get(data->dev); 347 if (ret < 0) 348 return ret; 349 350 /* do not allow changing critical threshold */ 351 if (trip == IMX_TRIP_CRITICAL) 352 return -EPERM; 353 354 /* do not allow passive to be set higher than critical */ 355 if (temp < 0 || temp > trips[IMX_TRIP_CRITICAL].temperature) 356 return -EINVAL; 357 358 trips[IMX_TRIP_PASSIVE].temperature = temp; 359 360 imx_set_alarm_temp(data, temp); 361 362 pm_runtime_put(data->dev); 363 364 return 0; 365 } 366 367 static int imx_bind(struct thermal_zone_device *tz, 368 struct thermal_cooling_device *cdev) 369 { 370 return thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, 371 THERMAL_NO_LIMIT, 372 THERMAL_NO_LIMIT, 373 THERMAL_WEIGHT_DEFAULT); 374 } 375 376 static int imx_unbind(struct thermal_zone_device *tz, 377 struct thermal_cooling_device *cdev) 378 { 379 return thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); 380 } 381 382 static struct thermal_zone_device_ops imx_tz_ops = { 383 .bind = imx_bind, 384 .unbind = imx_unbind, 385 .get_temp = imx_get_temp, 386 .change_mode = imx_change_mode, 387 .get_crit_temp = imx_get_crit_temp, 388 .set_trip_temp = imx_set_trip_temp, 389 }; 390 391 static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1) 392 { 393 struct imx_thermal_data *data = platform_get_drvdata(pdev); 394 int n1; 395 u64 temp64; 396 397 if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) { 398 dev_err(&pdev->dev, "invalid sensor calibration data\n"); 399 return -EINVAL; 400 } 401 402 /* 403 * On i.MX7D, we only use the calibration data at 25C to get the temp, 404 * Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C. 405 */ 406 if (data->socdata->version == TEMPMON_IMX7D) { 407 data->c1 = (ocotp_ana1 >> 9) & 0x1ff; 408 return 0; 409 } 410 411 /* 412 * The sensor is calibrated at 25 °C (aka T1) and the value measured 413 * (aka N1) at this temperature is provided in bits [31:20] in the 414 * i.MX's OCOTP value ANA1. 415 * To find the actual temperature T, the following formula has to be used 416 * when reading value n from the sensor: 417 * 418 * T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C 419 * = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C 420 * = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C 421 * = c2 - c1 * N 422 * 423 * with 424 * 425 * T1' = 28.580661 °C 426 * c1 = 1 / (0.0015423 * N1 - 0.4297157) °C 427 * c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C 428 * = T1' + N1 * c1 429 */ 430 n1 = ocotp_ana1 >> 20; 431 432 temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */ 433 temp64 *= 1000; /* to get result in °mC */ 434 do_div(temp64, 15423 * n1 - 4148468); 435 data->c1 = temp64; 436 data->c2 = n1 * data->c1 + 28581; 437 438 return 0; 439 } 440 441 static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0) 442 { 443 struct imx_thermal_data *data = platform_get_drvdata(pdev); 444 445 /* The maximum die temp is specified by the Temperature Grade */ 446 switch ((ocotp_mem0 >> 6) & 0x3) { 447 case 0: /* Commercial (0 to 95 °C) */ 448 data->temp_grade = "Commercial"; 449 data->temp_max = 95000; 450 break; 451 case 1: /* Extended Commercial (-20 °C to 105 °C) */ 452 data->temp_grade = "Extended Commercial"; 453 data->temp_max = 105000; 454 break; 455 case 2: /* Industrial (-40 °C to 105 °C) */ 456 data->temp_grade = "Industrial"; 457 data->temp_max = 105000; 458 break; 459 case 3: /* Automotive (-40 °C to 125 °C) */ 460 data->temp_grade = "Automotive"; 461 data->temp_max = 125000; 462 break; 463 } 464 465 /* 466 * Set the critical trip point at 5 °C under max 467 * Set the passive trip point at 10 °C under max (changeable via sysfs) 468 */ 469 trips[IMX_TRIP_PASSIVE].temperature = data->temp_max - (1000 * 10); 470 trips[IMX_TRIP_CRITICAL].temperature = data->temp_max - (1000 * 5); 471 } 472 473 static int imx_init_from_tempmon_data(struct platform_device *pdev) 474 { 475 struct regmap *map; 476 int ret; 477 u32 val; 478 479 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, 480 "fsl,tempmon-data"); 481 if (IS_ERR(map)) { 482 ret = PTR_ERR(map); 483 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); 484 return ret; 485 } 486 487 ret = regmap_read(map, OCOTP_ANA1, &val); 488 if (ret) { 489 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 490 return ret; 491 } 492 ret = imx_init_calib(pdev, val); 493 if (ret) 494 return ret; 495 496 ret = regmap_read(map, OCOTP_MEM0, &val); 497 if (ret) { 498 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); 499 return ret; 500 } 501 imx_init_temp_grade(pdev, val); 502 503 return 0; 504 } 505 506 static int imx_init_from_nvmem_cells(struct platform_device *pdev) 507 { 508 int ret; 509 u32 val; 510 511 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val); 512 if (ret) 513 return ret; 514 515 ret = imx_init_calib(pdev, val); 516 if (ret) 517 return ret; 518 519 ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val); 520 if (ret) 521 return ret; 522 imx_init_temp_grade(pdev, val); 523 524 return 0; 525 } 526 527 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) 528 { 529 struct imx_thermal_data *data = dev; 530 531 disable_irq_nosync(irq); 532 data->irq_enabled = false; 533 534 return IRQ_WAKE_THREAD; 535 } 536 537 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) 538 { 539 struct imx_thermal_data *data = dev; 540 541 dev_dbg(data->dev, "THERMAL ALARM: T > %d\n", data->alarm_temp / 1000); 542 543 thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED); 544 545 return IRQ_HANDLED; 546 } 547 548 static const struct of_device_id of_imx_thermal_match[] = { 549 { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, }, 550 { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, }, 551 { .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, }, 552 { /* end */ } 553 }; 554 MODULE_DEVICE_TABLE(of, of_imx_thermal_match); 555 556 #ifdef CONFIG_CPU_FREQ 557 /* 558 * Create cooling device in case no #cooling-cells property is available in 559 * CPU node 560 */ 561 static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 562 { 563 struct device_node *np; 564 int ret = 0; 565 566 data->policy = cpufreq_cpu_get(0); 567 if (!data->policy) { 568 pr_debug("%s: CPUFreq policy not found\n", __func__); 569 return -EPROBE_DEFER; 570 } 571 572 np = of_get_cpu_node(data->policy->cpu, NULL); 573 574 if (!np || !of_find_property(np, "#cooling-cells", NULL)) { 575 data->cdev = cpufreq_cooling_register(data->policy); 576 if (IS_ERR(data->cdev)) { 577 ret = PTR_ERR(data->cdev); 578 cpufreq_cpu_put(data->policy); 579 } 580 } 581 582 of_node_put(np); 583 584 return ret; 585 } 586 587 static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 588 { 589 cpufreq_cooling_unregister(data->cdev); 590 cpufreq_cpu_put(data->policy); 591 } 592 593 #else 594 595 static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data) 596 { 597 return 0; 598 } 599 600 static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data) 601 { 602 } 603 #endif 604 605 static int imx_thermal_probe(struct platform_device *pdev) 606 { 607 struct imx_thermal_data *data; 608 struct regmap *map; 609 int measure_freq; 610 int ret; 611 612 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 613 if (!data) 614 return -ENOMEM; 615 616 data->dev = &pdev->dev; 617 618 map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); 619 if (IS_ERR(map)) { 620 ret = PTR_ERR(map); 621 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); 622 return ret; 623 } 624 data->tempmon = map; 625 626 data->socdata = of_device_get_match_data(&pdev->dev); 627 if (!data->socdata) { 628 dev_err(&pdev->dev, "no device match found\n"); 629 return -ENODEV; 630 } 631 632 /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */ 633 if (data->socdata->version == TEMPMON_IMX6SX) { 634 regmap_write(map, IMX6_MISC1 + REG_CLR, 635 IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW 636 | IMX6_MISC1_IRQ_TEMPPANIC); 637 /* 638 * reset value of LOW ALARM is incorrect, set it to lowest 639 * value to avoid false trigger of low alarm. 640 */ 641 regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET, 642 data->socdata->low_alarm_mask); 643 } 644 645 data->irq = platform_get_irq(pdev, 0); 646 if (data->irq < 0) 647 return data->irq; 648 649 platform_set_drvdata(pdev, data); 650 651 if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) { 652 ret = imx_init_from_nvmem_cells(pdev); 653 if (ret) 654 return dev_err_probe(&pdev->dev, ret, 655 "failed to init from nvmem\n"); 656 } else { 657 ret = imx_init_from_tempmon_data(pdev); 658 if (ret) { 659 dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n"); 660 return ret; 661 } 662 } 663 664 /* Make sure sensor is in known good state for measurements */ 665 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 666 data->socdata->power_down_mask); 667 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 668 data->socdata->measure_temp_mask); 669 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, 670 data->socdata->measure_freq_mask); 671 if (data->socdata->version != TEMPMON_IMX7D) 672 regmap_write(map, IMX6_MISC0 + REG_SET, 673 IMX6_MISC0_REFTOP_SELBIASOFF); 674 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 675 data->socdata->power_down_mask); 676 677 ret = imx_thermal_register_legacy_cooling(data); 678 if (ret) 679 return dev_err_probe(&pdev->dev, ret, 680 "failed to register cpufreq cooling device\n"); 681 682 data->thermal_clk = devm_clk_get(&pdev->dev, NULL); 683 if (IS_ERR(data->thermal_clk)) { 684 ret = PTR_ERR(data->thermal_clk); 685 if (ret != -EPROBE_DEFER) 686 dev_err(&pdev->dev, 687 "failed to get thermal clk: %d\n", ret); 688 goto legacy_cleanup; 689 } 690 691 /* 692 * Thermal sensor needs clk on to get correct value, normally 693 * we should enable its clk before taking measurement and disable 694 * clk after measurement is done, but if alarm function is enabled, 695 * hardware will auto measure the temperature periodically, so we 696 * need to keep the clk always on for alarm function. 697 */ 698 ret = clk_prepare_enable(data->thermal_clk); 699 if (ret) { 700 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); 701 goto legacy_cleanup; 702 } 703 704 data->tz = thermal_zone_device_register_with_trips("imx_thermal_zone", 705 trips, 706 ARRAY_SIZE(trips), 707 BIT(IMX_TRIP_PASSIVE), data, 708 &imx_tz_ops, NULL, 709 IMX_PASSIVE_DELAY, 710 IMX_POLLING_DELAY); 711 if (IS_ERR(data->tz)) { 712 ret = PTR_ERR(data->tz); 713 dev_err(&pdev->dev, 714 "failed to register thermal zone device %d\n", ret); 715 goto clk_disable; 716 } 717 718 dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC" 719 " critical:%dC passive:%dC\n", data->temp_grade, 720 data->temp_max / 1000, trips[IMX_TRIP_CRITICAL].temperature / 1000, 721 trips[IMX_TRIP_PASSIVE].temperature / 1000); 722 723 /* Enable measurements at ~ 10 Hz */ 724 regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR, 725 data->socdata->measure_freq_mask); 726 measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ 727 regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET, 728 measure_freq << data->socdata->measure_freq_shift); 729 imx_set_alarm_temp(data, trips[IMX_TRIP_PASSIVE].temperature); 730 731 if (data->socdata->version == TEMPMON_IMX6SX) 732 imx_set_panic_temp(data, trips[IMX_TRIP_CRITICAL].temperature); 733 734 regmap_write(map, data->socdata->sensor_ctrl + REG_CLR, 735 data->socdata->power_down_mask); 736 regmap_write(map, data->socdata->sensor_ctrl + REG_SET, 737 data->socdata->measure_temp_mask); 738 /* After power up, we need a delay before first access can be done. */ 739 usleep_range(20, 50); 740 741 /* the core was configured and enabled just before */ 742 pm_runtime_set_active(&pdev->dev); 743 pm_runtime_enable(data->dev); 744 745 ret = pm_runtime_resume_and_get(data->dev); 746 if (ret < 0) 747 goto disable_runtime_pm; 748 749 data->irq_enabled = true; 750 ret = thermal_zone_device_enable(data->tz); 751 if (ret) 752 goto thermal_zone_unregister; 753 754 ret = devm_request_threaded_irq(&pdev->dev, data->irq, 755 imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, 756 0, "imx_thermal", data); 757 if (ret < 0) { 758 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); 759 goto thermal_zone_unregister; 760 } 761 762 pm_runtime_put(data->dev); 763 764 return 0; 765 766 thermal_zone_unregister: 767 thermal_zone_device_unregister(data->tz); 768 disable_runtime_pm: 769 pm_runtime_put_noidle(data->dev); 770 pm_runtime_disable(data->dev); 771 clk_disable: 772 clk_disable_unprepare(data->thermal_clk); 773 legacy_cleanup: 774 imx_thermal_unregister_legacy_cooling(data); 775 776 return ret; 777 } 778 779 static int imx_thermal_remove(struct platform_device *pdev) 780 { 781 struct imx_thermal_data *data = platform_get_drvdata(pdev); 782 783 pm_runtime_put_noidle(data->dev); 784 pm_runtime_disable(data->dev); 785 786 thermal_zone_device_unregister(data->tz); 787 imx_thermal_unregister_legacy_cooling(data); 788 789 return 0; 790 } 791 792 static int __maybe_unused imx_thermal_suspend(struct device *dev) 793 { 794 struct imx_thermal_data *data = dev_get_drvdata(dev); 795 int ret; 796 797 /* 798 * Need to disable thermal sensor, otherwise, when thermal core 799 * try to get temperature before thermal sensor resume, a wrong 800 * temperature will be read as the thermal sensor is powered 801 * down. This is done in change_mode() operation called from 802 * thermal_zone_device_disable() 803 */ 804 ret = thermal_zone_device_disable(data->tz); 805 if (ret) 806 return ret; 807 808 return pm_runtime_force_suspend(data->dev); 809 } 810 811 static int __maybe_unused imx_thermal_resume(struct device *dev) 812 { 813 struct imx_thermal_data *data = dev_get_drvdata(dev); 814 int ret; 815 816 ret = pm_runtime_force_resume(data->dev); 817 if (ret) 818 return ret; 819 /* Enabled thermal sensor after resume */ 820 return thermal_zone_device_enable(data->tz); 821 } 822 823 static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev) 824 { 825 struct imx_thermal_data *data = dev_get_drvdata(dev); 826 const struct thermal_soc_data *socdata = data->socdata; 827 struct regmap *map = data->tempmon; 828 int ret; 829 830 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, 831 socdata->measure_temp_mask); 832 if (ret) 833 return ret; 834 835 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, 836 socdata->power_down_mask); 837 if (ret) 838 return ret; 839 840 clk_disable_unprepare(data->thermal_clk); 841 842 return 0; 843 } 844 845 static int __maybe_unused imx_thermal_runtime_resume(struct device *dev) 846 { 847 struct imx_thermal_data *data = dev_get_drvdata(dev); 848 const struct thermal_soc_data *socdata = data->socdata; 849 struct regmap *map = data->tempmon; 850 int ret; 851 852 ret = clk_prepare_enable(data->thermal_clk); 853 if (ret) 854 return ret; 855 856 ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, 857 socdata->power_down_mask); 858 if (ret) 859 return ret; 860 861 ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, 862 socdata->measure_temp_mask); 863 if (ret) 864 return ret; 865 866 /* 867 * According to the temp sensor designers, it may require up to ~17us 868 * to complete a measurement. 869 */ 870 usleep_range(20, 50); 871 872 return 0; 873 } 874 875 static const struct dev_pm_ops imx_thermal_pm_ops = { 876 SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume) 877 SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend, 878 imx_thermal_runtime_resume, NULL) 879 }; 880 881 static struct platform_driver imx_thermal = { 882 .driver = { 883 .name = "imx_thermal", 884 .pm = &imx_thermal_pm_ops, 885 .of_match_table = of_imx_thermal_match, 886 }, 887 .probe = imx_thermal_probe, 888 .remove = imx_thermal_remove, 889 }; 890 module_platform_driver(imx_thermal); 891 892 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 893 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); 894 MODULE_LICENSE("GPL v2"); 895 MODULE_ALIAS("platform:imx-thermal"); 896