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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 | // SPDX-License-Identifier: GPL-2.0 /* * Thermal sensor driver for Allwinner SOC * Copyright (C) 2019 Yangtao Li * * Based on the work of Icenowy Zheng <icenowy@aosc.io> * Based on the work of Ondrej Jirman <megous@megous.com> * Based on the work of Josef Gajdusek <atx@atx.name> */ #include <linux/bitmap.h> #include <linux/clk.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/nvmem-consumer.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/reset.h> #include <linux/slab.h> #include <linux/thermal.h> #include "thermal_hwmon.h" #define MAX_SENSOR_NUM 4 #define FT_TEMP_MASK GENMASK(11, 0) #define TEMP_CALIB_MASK GENMASK(11, 0) #define CALIBRATE_DEFAULT 0x800 #define SUN8I_THS_CTRL0 0x00 #define SUN8I_THS_CTRL2 0x40 #define SUN8I_THS_IC 0x44 #define SUN8I_THS_IS 0x48 #define SUN8I_THS_MFC 0x70 #define SUN8I_THS_TEMP_CALIB 0x74 #define SUN8I_THS_TEMP_DATA 0x80 #define SUN50I_THS_CTRL0 0x00 #define SUN50I_H6_THS_ENABLE 0x04 #define SUN50I_H6_THS_PC 0x08 #define SUN50I_H6_THS_DIC 0x10 #define SUN50I_H6_THS_DIS 0x20 #define SUN50I_H6_THS_MFC 0x30 #define SUN50I_H6_THS_TEMP_CALIB 0xa0 #define SUN50I_H6_THS_TEMP_DATA 0xc0 #define SUN8I_THS_CTRL0_T_ACQ0(x) (GENMASK(15, 0) & (x)) #define SUN8I_THS_CTRL2_T_ACQ1(x) ((GENMASK(15, 0) & (x)) << 16) #define SUN8I_THS_DATA_IRQ_STS(x) BIT(x + 8) #define SUN50I_THS_CTRL0_T_ACQ(x) ((GENMASK(15, 0) & (x)) << 16) #define SUN50I_THS_FILTER_EN BIT(2) #define SUN50I_THS_FILTER_TYPE(x) (GENMASK(1, 0) & (x)) #define SUN50I_H6_THS_PC_TEMP_PERIOD(x) ((GENMASK(19, 0) & (x)) << 12) #define SUN50I_H6_THS_DATA_IRQ_STS(x) BIT(x) /* millidegree celsius */ struct tsensor { struct ths_device *tmdev; struct thermal_zone_device *tzd; int id; }; struct ths_thermal_chip { bool has_mod_clk; bool has_bus_clk_reset; int sensor_num; int offset; int scale; int ft_deviation; int temp_data_base; int (*calibrate)(struct ths_device *tmdev, u16 *caldata, int callen); int (*init)(struct ths_device *tmdev); unsigned long (*irq_ack)(struct ths_device *tmdev); int (*calc_temp)(struct ths_device *tmdev, int id, int reg); }; struct ths_device { const struct ths_thermal_chip *chip; struct device *dev; struct regmap *regmap; struct reset_control *reset; struct clk *bus_clk; struct clk *mod_clk; struct tsensor sensor[MAX_SENSOR_NUM]; }; /* Temp Unit: millidegree Celsius */ static int sun8i_ths_calc_temp(struct ths_device *tmdev, int id, int reg) { return tmdev->chip->offset - (reg * tmdev->chip->scale / 10); } static int sun50i_h5_calc_temp(struct ths_device *tmdev, int id, int reg) { if (reg >= 0x500) return -1191 * reg / 10 + 223000; else if (!id) return -1452 * reg / 10 + 259000; else return -1590 * reg / 10 + 276000; } static int sun8i_ths_get_temp(struct thermal_zone_device *tz, int *temp) { struct tsensor *s = tz->devdata; struct ths_device *tmdev = s->tmdev; int val = 0; regmap_read(tmdev->regmap, tmdev->chip->temp_data_base + 0x4 * s->id, &val); /* ths have no data yet */ if (!val) return -EAGAIN; *temp = tmdev->chip->calc_temp(tmdev, s->id, val); /* * According to the original sdk, there are some platforms(rarely) * that add a fixed offset value after calculating the temperature * value. We can't simply put it on the formula for calculating the * temperature above, because the formula for calculating the * temperature above is also used when the sensor is calibrated. If * do this, the correct calibration formula is hard to know. */ *temp += tmdev->chip->ft_deviation; return 0; } static const struct thermal_zone_device_ops ths_ops = { .get_temp = sun8i_ths_get_temp, }; static const struct regmap_config config = { .reg_bits = 32, .val_bits = 32, .reg_stride = 4, .fast_io = true, .max_register = 0xfc, }; static unsigned long sun8i_h3_irq_ack(struct ths_device *tmdev) { unsigned long irq_bitmap = 0; int i, state; regmap_read(tmdev->regmap, SUN8I_THS_IS, &state); for (i = 0; i < tmdev->chip->sensor_num; i++) { if (state & SUN8I_THS_DATA_IRQ_STS(i)) { regmap_write(tmdev->regmap, SUN8I_THS_IS, SUN8I_THS_DATA_IRQ_STS(i)); bitmap_set(&irq_bitmap, i, 1); } } return irq_bitmap; } static unsigned long sun50i_h6_irq_ack(struct ths_device *tmdev) { unsigned long irq_bitmap = 0; int i, state; regmap_read(tmdev->regmap, SUN50I_H6_THS_DIS, &state); for (i = 0; i < tmdev->chip->sensor_num; i++) { if (state & SUN50I_H6_THS_DATA_IRQ_STS(i)) { regmap_write(tmdev->regmap, SUN50I_H6_THS_DIS, SUN50I_H6_THS_DATA_IRQ_STS(i)); bitmap_set(&irq_bitmap, i, 1); } } return irq_bitmap; } static irqreturn_t sun8i_irq_thread(int irq, void *data) { struct ths_device *tmdev = data; unsigned long irq_bitmap = tmdev->chip->irq_ack(tmdev); int i; for_each_set_bit(i, &irq_bitmap, tmdev->chip->sensor_num) { thermal_zone_device_update(tmdev->sensor[i].tzd, THERMAL_EVENT_UNSPECIFIED); } return IRQ_HANDLED; } static int sun8i_h3_ths_calibrate(struct ths_device *tmdev, u16 *caldata, int callen) { int i; if (!caldata[0] || callen < 2 * tmdev->chip->sensor_num) return -EINVAL; for (i = 0; i < tmdev->chip->sensor_num; i++) { int offset = (i % 2) << 4; regmap_update_bits(tmdev->regmap, SUN8I_THS_TEMP_CALIB + (4 * (i >> 1)), 0xfff << offset, caldata[i] << offset); } return 0; } static int sun50i_h6_ths_calibrate(struct ths_device *tmdev, u16 *caldata, int callen) { struct device *dev = tmdev->dev; int i, ft_temp; if (!caldata[0] || callen < 2 + 2 * tmdev->chip->sensor_num) return -EINVAL; /* * efuse layout: * * 0 11 16 32 * +-------+-------+-------+ * |temp| |sensor0|sensor1| * +-------+-------+-------+ * * The calibration data on the H6 is the ambient temperature and * sensor values that are filled during the factory test stage. * * The unit of stored FT temperature is 0.1 degree celsius. * * We need to calculate a delta between measured and caluclated * register values and this will become a calibration offset. */ ft_temp = (caldata[0] & FT_TEMP_MASK) * 100; for (i = 0; i < tmdev->chip->sensor_num; i++) { int sensor_reg = caldata[i + 1] & TEMP_CALIB_MASK; int cdata, offset; int sensor_temp = tmdev->chip->calc_temp(tmdev, i, sensor_reg); /* * Calibration data is CALIBRATE_DEFAULT - (calculated * temperature from sensor reading at factory temperature * minus actual factory temperature) * 14.88 (scale from * temperature to register values) */ cdata = CALIBRATE_DEFAULT - ((sensor_temp - ft_temp) * 10 / tmdev->chip->scale); if (cdata & ~TEMP_CALIB_MASK) { /* * Calibration value more than 12-bit, but calibration * register is 12-bit. In this case, ths hardware can * still work without calibration, although the data * won't be so accurate. */ dev_warn(dev, "sensor%d is not calibrated.\n", i); continue; } offset = (i % 2) * 16; regmap_update_bits(tmdev->regmap, SUN50I_H6_THS_TEMP_CALIB + (i / 2 * 4), 0xfff << offset, cdata << offset); } return 0; } static int sun8i_ths_calibrate(struct ths_device *tmdev) { struct nvmem_cell *calcell; struct device *dev = tmdev->dev; u16 *caldata; size_t callen; int ret = 0; calcell = devm_nvmem_cell_get(dev, "calibration"); if (IS_ERR(calcell)) { if (PTR_ERR(calcell) == -EPROBE_DEFER) return -EPROBE_DEFER; /* * Even if the external calibration data stored in sid is * not accessible, the THS hardware can still work, although * the data won't be so accurate. * * The default value of calibration register is 0x800 for * every sensor, and the calibration value is usually 0x7xx * or 0x8xx, so they won't be away from the default value * for a lot. * * So here we do not return error if the calibration data is * not available, except the probe needs deferring. */ goto out; } caldata = nvmem_cell_read(calcell, &callen); if (IS_ERR(caldata)) { ret = PTR_ERR(caldata); goto out; } tmdev->chip->calibrate(tmdev, caldata, callen); kfree(caldata); out: return ret; } static int sun8i_ths_resource_init(struct ths_device *tmdev) { struct device *dev = tmdev->dev; struct platform_device *pdev = to_platform_device(dev); void __iomem *base; int ret; base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(base)) return PTR_ERR(base); tmdev->regmap = devm_regmap_init_mmio(dev, base, &config); if (IS_ERR(tmdev->regmap)) return PTR_ERR(tmdev->regmap); if (tmdev->chip->has_bus_clk_reset) { tmdev->reset = devm_reset_control_get(dev, NULL); if (IS_ERR(tmdev->reset)) return PTR_ERR(tmdev->reset); tmdev->bus_clk = devm_clk_get(&pdev->dev, "bus"); if (IS_ERR(tmdev->bus_clk)) return PTR_ERR(tmdev->bus_clk); } if (tmdev->chip->has_mod_clk) { tmdev->mod_clk = devm_clk_get(&pdev->dev, "mod"); if (IS_ERR(tmdev->mod_clk)) return PTR_ERR(tmdev->mod_clk); } ret = reset_control_deassert(tmdev->reset); if (ret) return ret; ret = clk_prepare_enable(tmdev->bus_clk); if (ret) goto assert_reset; ret = clk_set_rate(tmdev->mod_clk, 24000000); if (ret) goto bus_disable; ret = clk_prepare_enable(tmdev->mod_clk); if (ret) goto bus_disable; ret = sun8i_ths_calibrate(tmdev); if (ret) goto mod_disable; return 0; mod_disable: clk_disable_unprepare(tmdev->mod_clk); bus_disable: clk_disable_unprepare(tmdev->bus_clk); assert_reset: reset_control_assert(tmdev->reset); return ret; } static int sun8i_h3_thermal_init(struct ths_device *tmdev) { int val; /* average over 4 samples */ regmap_write(tmdev->regmap, SUN8I_THS_MFC, SUN50I_THS_FILTER_EN | SUN50I_THS_FILTER_TYPE(1)); /* * clkin = 24MHz * filter_samples = 4 * period = 0.25s * * x = period * clkin / 4096 / filter_samples - 1 * = 365 */ val = GENMASK(7 + tmdev->chip->sensor_num, 8); regmap_write(tmdev->regmap, SUN8I_THS_IC, SUN50I_H6_THS_PC_TEMP_PERIOD(365) | val); /* * T_acq = 20us * clkin = 24MHz * * x = T_acq * clkin - 1 * = 479 */ regmap_write(tmdev->regmap, SUN8I_THS_CTRL0, SUN8I_THS_CTRL0_T_ACQ0(479)); val = GENMASK(tmdev->chip->sensor_num - 1, 0); regmap_write(tmdev->regmap, SUN8I_THS_CTRL2, SUN8I_THS_CTRL2_T_ACQ1(479) | val); return 0; } /* * Without this undocumented value, the returned temperatures would * be higher than real ones by about 20C. */ #define SUN50I_H6_CTRL0_UNK 0x0000002f static int sun50i_h6_thermal_init(struct ths_device *tmdev) { int val; /* * T_acq = 20us * clkin = 24MHz * * x = T_acq * clkin - 1 * = 479 */ regmap_write(tmdev->regmap, SUN50I_THS_CTRL0, SUN50I_H6_CTRL0_UNK | SUN50I_THS_CTRL0_T_ACQ(479)); /* average over 4 samples */ regmap_write(tmdev->regmap, SUN50I_H6_THS_MFC, SUN50I_THS_FILTER_EN | SUN50I_THS_FILTER_TYPE(1)); /* * clkin = 24MHz * filter_samples = 4 * period = 0.25s * * x = period * clkin / 4096 / filter_samples - 1 * = 365 */ regmap_write(tmdev->regmap, SUN50I_H6_THS_PC, SUN50I_H6_THS_PC_TEMP_PERIOD(365)); /* enable sensor */ val = GENMASK(tmdev->chip->sensor_num - 1, 0); regmap_write(tmdev->regmap, SUN50I_H6_THS_ENABLE, val); /* thermal data interrupt enable */ val = GENMASK(tmdev->chip->sensor_num - 1, 0); regmap_write(tmdev->regmap, SUN50I_H6_THS_DIC, val); return 0; } static int sun8i_ths_register(struct ths_device *tmdev) { int i; for (i = 0; i < tmdev->chip->sensor_num; i++) { tmdev->sensor[i].tmdev = tmdev; tmdev->sensor[i].id = i; tmdev->sensor[i].tzd = devm_thermal_of_zone_register(tmdev->dev, i, &tmdev->sensor[i], &ths_ops); if (IS_ERR(tmdev->sensor[i].tzd)) return PTR_ERR(tmdev->sensor[i].tzd); if (devm_thermal_add_hwmon_sysfs(tmdev->sensor[i].tzd)) dev_warn(tmdev->dev, "Failed to add hwmon sysfs attributes\n"); } return 0; } static int sun8i_ths_probe(struct platform_device *pdev) { struct ths_device *tmdev; struct device *dev = &pdev->dev; int ret, irq; tmdev = devm_kzalloc(dev, sizeof(*tmdev), GFP_KERNEL); if (!tmdev) return -ENOMEM; tmdev->dev = dev; tmdev->chip = of_device_get_match_data(&pdev->dev); if (!tmdev->chip) return -EINVAL; platform_set_drvdata(pdev, tmdev); ret = sun8i_ths_resource_init(tmdev); if (ret) return ret; irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; ret = tmdev->chip->init(tmdev); if (ret) return ret; ret = sun8i_ths_register(tmdev); if (ret) return ret; /* * Avoid entering the interrupt handler, the thermal device is not * registered yet, we deffer the registration of the interrupt to * the end. */ ret = devm_request_threaded_irq(dev, irq, NULL, sun8i_irq_thread, IRQF_ONESHOT, "ths", tmdev); if (ret) return ret; return 0; } static int sun8i_ths_remove(struct platform_device *pdev) { struct ths_device *tmdev = platform_get_drvdata(pdev); clk_disable_unprepare(tmdev->mod_clk); clk_disable_unprepare(tmdev->bus_clk); reset_control_assert(tmdev->reset); return 0; } static const struct ths_thermal_chip sun8i_a83t_ths = { .sensor_num = 3, .scale = 705, .offset = 191668, .temp_data_base = SUN8I_THS_TEMP_DATA, .calibrate = sun8i_h3_ths_calibrate, .init = sun8i_h3_thermal_init, .irq_ack = sun8i_h3_irq_ack, .calc_temp = sun8i_ths_calc_temp, }; static const struct ths_thermal_chip sun8i_h3_ths = { .sensor_num = 1, .scale = 1211, .offset = 217000, .has_mod_clk = true, .has_bus_clk_reset = true, .temp_data_base = SUN8I_THS_TEMP_DATA, .calibrate = sun8i_h3_ths_calibrate, .init = sun8i_h3_thermal_init, .irq_ack = sun8i_h3_irq_ack, .calc_temp = sun8i_ths_calc_temp, }; static const struct ths_thermal_chip sun8i_r40_ths = { .sensor_num = 2, .offset = 251086, .scale = 1130, .has_mod_clk = true, .has_bus_clk_reset = true, .temp_data_base = SUN8I_THS_TEMP_DATA, .calibrate = sun8i_h3_ths_calibrate, .init = sun8i_h3_thermal_init, .irq_ack = sun8i_h3_irq_ack, .calc_temp = sun8i_ths_calc_temp, }; static const struct ths_thermal_chip sun50i_a64_ths = { .sensor_num = 3, .offset = 260890, .scale = 1170, .has_mod_clk = true, .has_bus_clk_reset = true, .temp_data_base = SUN8I_THS_TEMP_DATA, .calibrate = sun8i_h3_ths_calibrate, .init = sun8i_h3_thermal_init, .irq_ack = sun8i_h3_irq_ack, .calc_temp = sun8i_ths_calc_temp, }; static const struct ths_thermal_chip sun50i_a100_ths = { .sensor_num = 3, .has_bus_clk_reset = true, .ft_deviation = 8000, .offset = 187744, .scale = 672, .temp_data_base = SUN50I_H6_THS_TEMP_DATA, .calibrate = sun50i_h6_ths_calibrate, .init = sun50i_h6_thermal_init, .irq_ack = sun50i_h6_irq_ack, .calc_temp = sun8i_ths_calc_temp, }; static const struct ths_thermal_chip sun50i_h5_ths = { .sensor_num = 2, .has_mod_clk = true, .has_bus_clk_reset = true, .temp_data_base = SUN8I_THS_TEMP_DATA, .calibrate = sun8i_h3_ths_calibrate, .init = sun8i_h3_thermal_init, .irq_ack = sun8i_h3_irq_ack, .calc_temp = sun50i_h5_calc_temp, }; static const struct ths_thermal_chip sun50i_h6_ths = { .sensor_num = 2, .has_bus_clk_reset = true, .ft_deviation = 7000, .offset = 187744, .scale = 672, .temp_data_base = SUN50I_H6_THS_TEMP_DATA, .calibrate = sun50i_h6_ths_calibrate, .init = sun50i_h6_thermal_init, .irq_ack = sun50i_h6_irq_ack, .calc_temp = sun8i_ths_calc_temp, }; static const struct of_device_id of_ths_match[] = { { .compatible = "allwinner,sun8i-a83t-ths", .data = &sun8i_a83t_ths }, { .compatible = "allwinner,sun8i-h3-ths", .data = &sun8i_h3_ths }, { .compatible = "allwinner,sun8i-r40-ths", .data = &sun8i_r40_ths }, { .compatible = "allwinner,sun50i-a64-ths", .data = &sun50i_a64_ths }, { .compatible = "allwinner,sun50i-a100-ths", .data = &sun50i_a100_ths }, { .compatible = "allwinner,sun50i-h5-ths", .data = &sun50i_h5_ths }, { .compatible = "allwinner,sun50i-h6-ths", .data = &sun50i_h6_ths }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, of_ths_match); static struct platform_driver ths_driver = { .probe = sun8i_ths_probe, .remove = sun8i_ths_remove, .driver = { .name = "sun8i-thermal", .of_match_table = of_ths_match, }, }; module_platform_driver(ths_driver); MODULE_DESCRIPTION("Thermal sensor driver for Allwinner SOC"); MODULE_LICENSE("GPL v2"); |