1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HiSilicon thermal sensor driver 4 * 5 * Copyright (c) 2014-2015 HiSilicon Limited. 6 * Copyright (c) 2014-2015 Linaro Limited. 7 * 8 * Xinwei Kong <kong.kongxinwei@hisilicon.com> 9 * Leo Yan <leo.yan@linaro.org> 10 */ 11 12 #include <linux/cpufreq.h> 13 #include <linux/delay.h> 14 #include <linux/interrupt.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/platform_device.h> 18 #include <linux/io.h> 19 #include <linux/thermal.h> 20 21 #define HI6220_TEMP0_LAG (0x0) 22 #define HI6220_TEMP0_TH (0x4) 23 #define HI6220_TEMP0_RST_TH (0x8) 24 #define HI6220_TEMP0_CFG (0xC) 25 #define HI6220_TEMP0_CFG_SS_MSK (0xF000) 26 #define HI6220_TEMP0_CFG_HDAK_MSK (0x30) 27 #define HI6220_TEMP0_EN (0x10) 28 #define HI6220_TEMP0_INT_EN (0x14) 29 #define HI6220_TEMP0_INT_CLR (0x18) 30 #define HI6220_TEMP0_RST_MSK (0x1C) 31 #define HI6220_TEMP0_VALUE (0x28) 32 33 #define HI3660_OFFSET(chan) ((chan) * 0x40) 34 #define HI3660_TEMP(chan) (HI3660_OFFSET(chan) + 0x1C) 35 #define HI3660_TH(chan) (HI3660_OFFSET(chan) + 0x20) 36 #define HI3660_LAG(chan) (HI3660_OFFSET(chan) + 0x28) 37 #define HI3660_INT_EN(chan) (HI3660_OFFSET(chan) + 0x2C) 38 #define HI3660_INT_CLR(chan) (HI3660_OFFSET(chan) + 0x30) 39 40 #define HI6220_TEMP_BASE (-60000) 41 #define HI6220_TEMP_RESET (100000) 42 #define HI6220_TEMP_STEP (785) 43 #define HI6220_TEMP_LAG (3500) 44 45 #define HI3660_TEMP_BASE (-63780) 46 #define HI3660_TEMP_STEP (205) 47 #define HI3660_TEMP_LAG (4000) 48 49 #define HI6220_CLUSTER0_SENSOR 2 50 #define HI6220_CLUSTER1_SENSOR 1 51 52 #define HI3660_LITTLE_SENSOR 0 53 #define HI3660_BIG_SENSOR 1 54 #define HI3660_G3D_SENSOR 2 55 #define HI3660_MODEM_SENSOR 3 56 57 struct hisi_thermal_data; 58 59 struct hisi_thermal_sensor { 60 struct hisi_thermal_data *data; 61 struct thermal_zone_device *tzd; 62 const char *irq_name; 63 uint32_t id; 64 uint32_t thres_temp; 65 }; 66 67 struct hisi_thermal_ops { 68 int (*get_temp)(struct hisi_thermal_sensor *sensor); 69 int (*enable_sensor)(struct hisi_thermal_sensor *sensor); 70 int (*disable_sensor)(struct hisi_thermal_sensor *sensor); 71 int (*irq_handler)(struct hisi_thermal_sensor *sensor); 72 int (*probe)(struct hisi_thermal_data *data); 73 }; 74 75 struct hisi_thermal_data { 76 const struct hisi_thermal_ops *ops; 77 struct hisi_thermal_sensor *sensor; 78 struct platform_device *pdev; 79 struct clk *clk; 80 void __iomem *regs; 81 int nr_sensors; 82 }; 83 84 /* 85 * The temperature computation on the tsensor is as follow: 86 * Unit: millidegree Celsius 87 * Step: 200/255 (0.7843) 88 * Temperature base: -60°C 89 * 90 * The register is programmed in temperature steps, every step is 785 91 * millidegree and begins at -60 000 m°C 92 * 93 * The temperature from the steps: 94 * 95 * Temp = TempBase + (steps x 785) 96 * 97 * and the steps from the temperature: 98 * 99 * steps = (Temp - TempBase) / 785 100 * 101 */ 102 static inline int hi6220_thermal_step_to_temp(int step) 103 { 104 return HI6220_TEMP_BASE + (step * HI6220_TEMP_STEP); 105 } 106 107 static inline int hi6220_thermal_temp_to_step(int temp) 108 { 109 return DIV_ROUND_UP(temp - HI6220_TEMP_BASE, HI6220_TEMP_STEP); 110 } 111 112 /* 113 * for Hi3660, 114 * Step: 189/922 (0.205) 115 * Temperature base: -63.780°C 116 * 117 * The register is programmed in temperature steps, every step is 205 118 * millidegree and begins at -63 780 m°C 119 */ 120 static inline int hi3660_thermal_step_to_temp(int step) 121 { 122 return HI3660_TEMP_BASE + step * HI3660_TEMP_STEP; 123 } 124 125 static inline int hi3660_thermal_temp_to_step(int temp) 126 { 127 return DIV_ROUND_UP(temp - HI3660_TEMP_BASE, HI3660_TEMP_STEP); 128 } 129 130 /* 131 * The lag register contains 5 bits encoding the temperature in steps. 132 * 133 * Each time the temperature crosses the threshold boundary, an 134 * interrupt is raised. It could be when the temperature is going 135 * above the threshold or below. However, if the temperature is 136 * fluctuating around this value due to the load, we can receive 137 * several interrupts which may not desired. 138 * 139 * We can setup a temperature representing the delta between the 140 * threshold and the current temperature when the temperature is 141 * decreasing. 142 * 143 * For instance: the lag register is 5°C, the threshold is 65°C, when 144 * the temperature reaches 65°C an interrupt is raised and when the 145 * temperature decrease to 65°C - 5°C another interrupt is raised. 146 * 147 * A very short lag can lead to an interrupt storm, a long lag 148 * increase the latency to react to the temperature changes. In our 149 * case, that is not really a problem as we are polling the 150 * temperature. 151 * 152 * [0:4] : lag register 153 * 154 * The temperature is coded in steps, cf. HI6220_TEMP_STEP. 155 * 156 * Min : 0x00 : 0.0 °C 157 * Max : 0x1F : 24.3 °C 158 * 159 * The 'value' parameter is in milliCelsius. 160 */ 161 static inline void hi6220_thermal_set_lag(void __iomem *addr, int value) 162 { 163 writel(DIV_ROUND_UP(value, HI6220_TEMP_STEP) & 0x1F, 164 addr + HI6220_TEMP0_LAG); 165 } 166 167 static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value) 168 { 169 writel(value, addr + HI6220_TEMP0_INT_CLR); 170 } 171 172 static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value) 173 { 174 writel(value, addr + HI6220_TEMP0_INT_EN); 175 } 176 177 static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp) 178 { 179 writel(hi6220_thermal_temp_to_step(temp) | 0x0FFFFFF00, 180 addr + HI6220_TEMP0_TH); 181 } 182 183 static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp) 184 { 185 writel(hi6220_thermal_temp_to_step(temp), addr + HI6220_TEMP0_RST_TH); 186 } 187 188 static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value) 189 { 190 writel(value, addr + HI6220_TEMP0_RST_MSK); 191 } 192 193 static inline void hi6220_thermal_enable(void __iomem *addr, int value) 194 { 195 writel(value, addr + HI6220_TEMP0_EN); 196 } 197 198 static inline int hi6220_thermal_get_temperature(void __iomem *addr) 199 { 200 return hi6220_thermal_step_to_temp(readl(addr + HI6220_TEMP0_VALUE)); 201 } 202 203 /* 204 * [0:6] lag register 205 * 206 * The temperature is coded in steps, cf. HI3660_TEMP_STEP. 207 * 208 * Min : 0x00 : 0.0 °C 209 * Max : 0x7F : 26.0 °C 210 * 211 */ 212 static inline void hi3660_thermal_set_lag(void __iomem *addr, 213 int id, int value) 214 { 215 writel(DIV_ROUND_UP(value, HI3660_TEMP_STEP) & 0x7F, 216 addr + HI3660_LAG(id)); 217 } 218 219 static inline void hi3660_thermal_alarm_clear(void __iomem *addr, 220 int id, int value) 221 { 222 writel(value, addr + HI3660_INT_CLR(id)); 223 } 224 225 static inline void hi3660_thermal_alarm_enable(void __iomem *addr, 226 int id, int value) 227 { 228 writel(value, addr + HI3660_INT_EN(id)); 229 } 230 231 static inline void hi3660_thermal_alarm_set(void __iomem *addr, 232 int id, int value) 233 { 234 writel(value, addr + HI3660_TH(id)); 235 } 236 237 static inline int hi3660_thermal_get_temperature(void __iomem *addr, int id) 238 { 239 return hi3660_thermal_step_to_temp(readl(addr + HI3660_TEMP(id))); 240 } 241 242 /* 243 * Temperature configuration register - Sensor selection 244 * 245 * Bits [19:12] 246 * 247 * 0x0: local sensor (default) 248 * 0x1: remote sensor 1 (ACPU cluster 1) 249 * 0x2: remote sensor 2 (ACPU cluster 0) 250 * 0x3: remote sensor 3 (G3D) 251 */ 252 static inline void hi6220_thermal_sensor_select(void __iomem *addr, int sensor) 253 { 254 writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_SS_MSK) | 255 (sensor << 12), addr + HI6220_TEMP0_CFG); 256 } 257 258 /* 259 * Temperature configuration register - Hdak conversion polling interval 260 * 261 * Bits [5:4] 262 * 263 * 0x0 : 0.768 ms 264 * 0x1 : 6.144 ms 265 * 0x2 : 49.152 ms 266 * 0x3 : 393.216 ms 267 */ 268 static inline void hi6220_thermal_hdak_set(void __iomem *addr, int value) 269 { 270 writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_HDAK_MSK) | 271 (value << 4), addr + HI6220_TEMP0_CFG); 272 } 273 274 static int hi6220_thermal_irq_handler(struct hisi_thermal_sensor *sensor) 275 { 276 struct hisi_thermal_data *data = sensor->data; 277 278 hi6220_thermal_alarm_clear(data->regs, 1); 279 return 0; 280 } 281 282 static int hi3660_thermal_irq_handler(struct hisi_thermal_sensor *sensor) 283 { 284 struct hisi_thermal_data *data = sensor->data; 285 286 hi3660_thermal_alarm_clear(data->regs, sensor->id, 1); 287 return 0; 288 } 289 290 static int hi6220_thermal_get_temp(struct hisi_thermal_sensor *sensor) 291 { 292 struct hisi_thermal_data *data = sensor->data; 293 294 return hi6220_thermal_get_temperature(data->regs); 295 } 296 297 static int hi3660_thermal_get_temp(struct hisi_thermal_sensor *sensor) 298 { 299 struct hisi_thermal_data *data = sensor->data; 300 301 return hi3660_thermal_get_temperature(data->regs, sensor->id); 302 } 303 304 static int hi6220_thermal_disable_sensor(struct hisi_thermal_sensor *sensor) 305 { 306 struct hisi_thermal_data *data = sensor->data; 307 308 /* disable sensor module */ 309 hi6220_thermal_enable(data->regs, 0); 310 hi6220_thermal_alarm_enable(data->regs, 0); 311 hi6220_thermal_reset_enable(data->regs, 0); 312 313 clk_disable_unprepare(data->clk); 314 315 return 0; 316 } 317 318 static int hi3660_thermal_disable_sensor(struct hisi_thermal_sensor *sensor) 319 { 320 struct hisi_thermal_data *data = sensor->data; 321 322 /* disable sensor module */ 323 hi3660_thermal_alarm_enable(data->regs, sensor->id, 0); 324 return 0; 325 } 326 327 static int hi6220_thermal_enable_sensor(struct hisi_thermal_sensor *sensor) 328 { 329 struct hisi_thermal_data *data = sensor->data; 330 int ret; 331 332 /* enable clock for tsensor */ 333 ret = clk_prepare_enable(data->clk); 334 if (ret) 335 return ret; 336 337 /* disable module firstly */ 338 hi6220_thermal_reset_enable(data->regs, 0); 339 hi6220_thermal_enable(data->regs, 0); 340 341 /* select sensor id */ 342 hi6220_thermal_sensor_select(data->regs, sensor->id); 343 344 /* setting the hdak time */ 345 hi6220_thermal_hdak_set(data->regs, 0); 346 347 /* setting lag value between current temp and the threshold */ 348 hi6220_thermal_set_lag(data->regs, HI6220_TEMP_LAG); 349 350 /* enable for interrupt */ 351 hi6220_thermal_alarm_set(data->regs, sensor->thres_temp); 352 353 hi6220_thermal_reset_set(data->regs, HI6220_TEMP_RESET); 354 355 /* enable module */ 356 hi6220_thermal_reset_enable(data->regs, 1); 357 hi6220_thermal_enable(data->regs, 1); 358 359 hi6220_thermal_alarm_clear(data->regs, 0); 360 hi6220_thermal_alarm_enable(data->regs, 1); 361 362 return 0; 363 } 364 365 static int hi3660_thermal_enable_sensor(struct hisi_thermal_sensor *sensor) 366 { 367 unsigned int value; 368 struct hisi_thermal_data *data = sensor->data; 369 370 /* disable interrupt */ 371 hi3660_thermal_alarm_enable(data->regs, sensor->id, 0); 372 373 /* setting lag value between current temp and the threshold */ 374 hi3660_thermal_set_lag(data->regs, sensor->id, HI3660_TEMP_LAG); 375 376 /* set interrupt threshold */ 377 value = hi3660_thermal_temp_to_step(sensor->thres_temp); 378 hi3660_thermal_alarm_set(data->regs, sensor->id, value); 379 380 /* enable interrupt */ 381 hi3660_thermal_alarm_clear(data->regs, sensor->id, 1); 382 hi3660_thermal_alarm_enable(data->regs, sensor->id, 1); 383 384 return 0; 385 } 386 387 static int hi6220_thermal_probe(struct hisi_thermal_data *data) 388 { 389 struct platform_device *pdev = data->pdev; 390 struct device *dev = &pdev->dev; 391 392 data->clk = devm_clk_get(dev, "thermal_clk"); 393 if (IS_ERR(data->clk)) 394 return dev_err_probe(dev, PTR_ERR(data->clk), "failed to get thermal clk\n"); 395 396 data->sensor = devm_kzalloc(dev, sizeof(*data->sensor), GFP_KERNEL); 397 if (!data->sensor) 398 return -ENOMEM; 399 400 data->sensor[0].id = HI6220_CLUSTER0_SENSOR; 401 data->sensor[0].irq_name = "tsensor_intr"; 402 data->sensor[0].data = data; 403 data->nr_sensors = 1; 404 405 return 0; 406 } 407 408 static int hi3660_thermal_probe(struct hisi_thermal_data *data) 409 { 410 struct platform_device *pdev = data->pdev; 411 struct device *dev = &pdev->dev; 412 413 data->nr_sensors = 1; 414 415 data->sensor = devm_kzalloc(dev, sizeof(*data->sensor) * 416 data->nr_sensors, GFP_KERNEL); 417 if (!data->sensor) 418 return -ENOMEM; 419 420 data->sensor[0].id = HI3660_BIG_SENSOR; 421 data->sensor[0].irq_name = "tsensor_a73"; 422 data->sensor[0].data = data; 423 424 return 0; 425 } 426 427 static int hisi_thermal_get_temp(struct thermal_zone_device *tz, int *temp) 428 { 429 struct hisi_thermal_sensor *sensor = thermal_zone_device_priv(tz); 430 struct hisi_thermal_data *data = sensor->data; 431 432 *temp = data->ops->get_temp(sensor); 433 434 return 0; 435 } 436 437 static const struct thermal_zone_device_ops hisi_of_thermal_ops = { 438 .get_temp = hisi_thermal_get_temp, 439 }; 440 441 static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) 442 { 443 struct hisi_thermal_sensor *sensor = dev; 444 struct hisi_thermal_data *data = sensor->data; 445 int temp = 0; 446 447 data->ops->irq_handler(sensor); 448 449 temp = data->ops->get_temp(sensor); 450 451 if (temp >= sensor->thres_temp) { 452 dev_crit(&data->pdev->dev, 453 "sensor <%d> THERMAL ALARM: %d > %d\n", 454 sensor->id, temp, sensor->thres_temp); 455 456 thermal_zone_device_update(sensor->tzd, 457 THERMAL_EVENT_UNSPECIFIED); 458 459 } else { 460 dev_crit(&data->pdev->dev, 461 "sensor <%d> THERMAL ALARM stopped: %d < %d\n", 462 sensor->id, temp, sensor->thres_temp); 463 } 464 465 return IRQ_HANDLED; 466 } 467 468 static int hisi_thermal_register_sensor(struct platform_device *pdev, 469 struct hisi_thermal_sensor *sensor) 470 { 471 int ret, i; 472 struct thermal_trip trip; 473 474 sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, 475 sensor->id, sensor, 476 &hisi_of_thermal_ops); 477 if (IS_ERR(sensor->tzd)) { 478 ret = PTR_ERR(sensor->tzd); 479 sensor->tzd = NULL; 480 dev_err(&pdev->dev, "failed to register sensor id %d: %d\n", 481 sensor->id, ret); 482 return ret; 483 } 484 485 for (i = 0; i < thermal_zone_get_num_trips(sensor->tzd); i++) { 486 487 thermal_zone_get_trip(sensor->tzd, i, &trip); 488 489 if (trip.type == THERMAL_TRIP_PASSIVE) { 490 sensor->thres_temp = trip.temperature; 491 break; 492 } 493 } 494 495 return 0; 496 } 497 498 static const struct hisi_thermal_ops hi6220_ops = { 499 .get_temp = hi6220_thermal_get_temp, 500 .enable_sensor = hi6220_thermal_enable_sensor, 501 .disable_sensor = hi6220_thermal_disable_sensor, 502 .irq_handler = hi6220_thermal_irq_handler, 503 .probe = hi6220_thermal_probe, 504 }; 505 506 static const struct hisi_thermal_ops hi3660_ops = { 507 .get_temp = hi3660_thermal_get_temp, 508 .enable_sensor = hi3660_thermal_enable_sensor, 509 .disable_sensor = hi3660_thermal_disable_sensor, 510 .irq_handler = hi3660_thermal_irq_handler, 511 .probe = hi3660_thermal_probe, 512 }; 513 514 static const struct of_device_id of_hisi_thermal_match[] = { 515 { 516 .compatible = "hisilicon,tsensor", 517 .data = &hi6220_ops, 518 }, 519 { 520 .compatible = "hisilicon,hi3660-tsensor", 521 .data = &hi3660_ops, 522 }, 523 { /* end */ } 524 }; 525 MODULE_DEVICE_TABLE(of, of_hisi_thermal_match); 526 527 static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor, 528 bool on) 529 { 530 struct thermal_zone_device *tzd = sensor->tzd; 531 532 if (on) 533 thermal_zone_device_enable(tzd); 534 else 535 thermal_zone_device_disable(tzd); 536 } 537 538 static int hisi_thermal_probe(struct platform_device *pdev) 539 { 540 struct hisi_thermal_data *data; 541 struct device *dev = &pdev->dev; 542 int i, ret; 543 544 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 545 if (!data) 546 return -ENOMEM; 547 548 data->pdev = pdev; 549 platform_set_drvdata(pdev, data); 550 data->ops = of_device_get_match_data(dev); 551 552 data->regs = devm_platform_ioremap_resource(pdev, 0); 553 if (IS_ERR(data->regs)) 554 return PTR_ERR(data->regs); 555 556 ret = data->ops->probe(data); 557 if (ret) 558 return ret; 559 560 for (i = 0; i < data->nr_sensors; i++) { 561 struct hisi_thermal_sensor *sensor = &data->sensor[i]; 562 563 ret = hisi_thermal_register_sensor(pdev, sensor); 564 if (ret) { 565 dev_err(dev, "failed to register thermal sensor: %d\n", 566 ret); 567 return ret; 568 } 569 570 ret = platform_get_irq(pdev, 0); 571 if (ret < 0) 572 return ret; 573 574 ret = devm_request_threaded_irq(dev, ret, NULL, 575 hisi_thermal_alarm_irq_thread, 576 IRQF_ONESHOT, sensor->irq_name, 577 sensor); 578 if (ret < 0) { 579 dev_err(dev, "Failed to request alarm irq: %d\n", ret); 580 return ret; 581 } 582 583 ret = data->ops->enable_sensor(sensor); 584 if (ret) { 585 dev_err(dev, "Failed to setup the sensor: %d\n", ret); 586 return ret; 587 } 588 589 hisi_thermal_toggle_sensor(sensor, true); 590 } 591 592 return 0; 593 } 594 595 static void hisi_thermal_remove(struct platform_device *pdev) 596 { 597 struct hisi_thermal_data *data = platform_get_drvdata(pdev); 598 int i; 599 600 for (i = 0; i < data->nr_sensors; i++) { 601 struct hisi_thermal_sensor *sensor = &data->sensor[i]; 602 603 hisi_thermal_toggle_sensor(sensor, false); 604 data->ops->disable_sensor(sensor); 605 } 606 } 607 608 static int hisi_thermal_suspend(struct device *dev) 609 { 610 struct hisi_thermal_data *data = dev_get_drvdata(dev); 611 int i; 612 613 for (i = 0; i < data->nr_sensors; i++) 614 data->ops->disable_sensor(&data->sensor[i]); 615 616 return 0; 617 } 618 619 static int hisi_thermal_resume(struct device *dev) 620 { 621 struct hisi_thermal_data *data = dev_get_drvdata(dev); 622 int i, ret = 0; 623 624 for (i = 0; i < data->nr_sensors; i++) 625 ret |= data->ops->enable_sensor(&data->sensor[i]); 626 627 return ret; 628 } 629 630 static DEFINE_SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops, 631 hisi_thermal_suspend, hisi_thermal_resume); 632 633 static struct platform_driver hisi_thermal_driver = { 634 .driver = { 635 .name = "hisi_thermal", 636 .pm = pm_sleep_ptr(&hisi_thermal_pm_ops), 637 .of_match_table = of_hisi_thermal_match, 638 }, 639 .probe = hisi_thermal_probe, 640 .remove_new = hisi_thermal_remove, 641 }; 642 643 module_platform_driver(hisi_thermal_driver); 644 645 MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>"); 646 MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>"); 647 MODULE_DESCRIPTION("HiSilicon thermal driver"); 648 MODULE_LICENSE("GPL v2"); 649