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sys/arm/broadcom/bcm2835/bcm2835_cpufreq.c
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1 /*- 2 * Copyright (C) 2013-2015 Daisuke Aoyama <aoyama@peach.ne.jp> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 #include <sys/cpu.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/module.h> 39 #include <sys/mutex.h> 40 #include <sys/sema.h> 41 #include <sys/sysctl.h> 42 43 #include <machine/bus.h> 44 #include <machine/cpu.h> 45 #include <machine/intr.h> 46 47 #include <dev/ofw/ofw_bus.h> 48 #include <dev/ofw/ofw_bus_subr.h> 49 50 #include <arm/broadcom/bcm2835/bcm2835_firmware.h> 51 #include <arm/broadcom/bcm2835/bcm2835_vcbus.h> 52 53 #include "cpufreq_if.h" 54 55 #ifdef DEBUG 56 #define DPRINTF(fmt, ...) do { \ 57 printf("%s:%u: ", __func__, __LINE__); \ 58 printf(fmt, ##__VA_ARGS__); \ 59 } while (0) 60 #else 61 #define DPRINTF(fmt, ...) 62 #endif 63 64 #define HZ2MHZ(freq) ((freq) / (1000 * 1000)) 65 #define MHZ2HZ(freq) ((freq) * (1000 * 1000)) 66 67 #ifdef SOC_BCM2835 68 #define OFFSET2MVOLT(val) (1200 + ((val) * 25)) 69 #define MVOLT2OFFSET(val) (((val) - 1200) / 25) 70 #define DEFAULT_ARM_FREQUENCY 700 71 #define DEFAULT_LOWEST_FREQ 300 72 #else 73 #define OFFSET2MVOLT(val) (((val) / 1000)) 74 #define MVOLT2OFFSET(val) (((val) * 1000)) 75 #define DEFAULT_ARM_FREQUENCY 600 76 #define DEFAULT_LOWEST_FREQ 600 77 #endif 78 #define DEFAULT_CORE_FREQUENCY 250 79 #define DEFAULT_SDRAM_FREQUENCY 400 80 #define TRANSITION_LATENCY 1000 81 #define MIN_OVER_VOLTAGE -16 82 #define MAX_OVER_VOLTAGE 6 83 #define MSG_ERROR -999999999 84 #define MHZSTEP 100 85 #define HZSTEP (MHZ2HZ(MHZSTEP)) 86 #define TZ_ZEROC 2731 87 88 #define VC_LOCK(sc) do { \ 89 sema_wait(&vc_sema); \ 90 } while (0) 91 #define VC_UNLOCK(sc) do { \ 92 sema_post(&vc_sema); \ 93 } while (0) 94 95 /* ARM->VC mailbox property semaphore */ 96 static struct sema vc_sema; 97 98 static struct sysctl_ctx_list bcm2835_sysctl_ctx; 99 100 struct bcm2835_cpufreq_softc { 101 device_t dev; 102 device_t firmware; 103 int arm_max_freq; 104 int arm_min_freq; 105 int core_max_freq; 106 int core_min_freq; 107 int sdram_max_freq; 108 int sdram_min_freq; 109 int max_voltage_core; 110 int min_voltage_core; 111 112 /* the values written in mbox */ 113 int voltage_core; 114 int voltage_sdram; 115 int voltage_sdram_c; 116 int voltage_sdram_i; 117 int voltage_sdram_p; 118 int turbo_mode; 119 120 /* initial hook for waiting mbox intr */ 121 struct intr_config_hook init_hook; 122 }; 123 124 static struct ofw_compat_data compat_data[] = { 125 { "broadcom,bcm2835-vc", 1 }, 126 { "broadcom,bcm2708-vc", 1 }, 127 { "brcm,bcm2709", 1 }, 128 { "brcm,bcm2835", 1 }, 129 { "brcm,bcm2836", 1 }, 130 { "brcm,bcm2837", 1 }, 131 { "brcm,bcm2711", 1 }, 132 { NULL, 0 } 133 }; 134 135 static int cpufreq_verbose = 0; 136 TUNABLE_INT("hw.bcm2835.cpufreq.verbose", &cpufreq_verbose); 137 static int cpufreq_lowest_freq = DEFAULT_LOWEST_FREQ; 138 TUNABLE_INT("hw.bcm2835.cpufreq.lowest_freq", &cpufreq_lowest_freq); 139 140 #ifdef PROP_DEBUG 141 static void 142 bcm2835_dump(const void *data, int len) 143 { 144 const uint8_t *p = (const uint8_t*)data; 145 int i; 146 147 printf("dump @ %p:\n", data); 148 for (i = 0; i < len; i++) { 149 printf("%2.2x ", p[i]); 150 if ((i % 4) == 3) 151 printf(" "); 152 if ((i % 16) == 15) 153 printf("\n"); 154 } 155 printf("\n"); 156 } 157 #endif 158 159 static int 160 bcm2835_cpufreq_get_clock_rate(struct bcm2835_cpufreq_softc *sc, 161 uint32_t clock_id) 162 { 163 union msg_get_clock_rate_body msg; 164 int rate; 165 int err; 166 167 /* 168 * Get clock rate 169 * Tag: 0x00030002 170 * Request: 171 * Length: 4 172 * Value: 173 * u32: clock id 174 * Response: 175 * Length: 8 176 * Value: 177 * u32: clock id 178 * u32: rate (in Hz) 179 */ 180 181 /* setup single tag buffer */ 182 memset(&msg, 0, sizeof(msg)); 183 msg.req.clock_id = clock_id; 184 185 /* call mailbox property */ 186 err = bcm2835_firmware_property(sc->firmware, 187 BCM2835_FIRMWARE_TAG_GET_CLOCK_RATE, &msg, sizeof(msg)); 188 if (err) { 189 device_printf(sc->dev, "can't get clock rate (id=%u)\n", 190 clock_id); 191 return (MSG_ERROR); 192 } 193 194 /* result (Hz) */ 195 rate = (int)msg.resp.rate_hz; 196 DPRINTF("clock = %d(Hz)\n", rate); 197 return (rate); 198 } 199 200 static int 201 bcm2835_cpufreq_get_max_clock_rate(struct bcm2835_cpufreq_softc *sc, 202 uint32_t clock_id) 203 { 204 union msg_get_clock_rate_body msg; 205 int rate; 206 int err; 207 208 /* 209 * Get max clock rate 210 * Tag: 0x00030004 211 * Request: 212 * Length: 4 213 * Value: 214 * u32: clock id 215 * Response: 216 * Length: 8 217 * Value: 218 * u32: clock id 219 * u32: rate (in Hz) 220 */ 221 222 /* setup single tag buffer */ 223 memset(&msg, 0, sizeof(msg)); 224 msg.req.clock_id = clock_id; 225 226 /* call mailbox property */ 227 err = bcm2835_firmware_property(sc->firmware, 228 BCM2835_FIRMWARE_TAG_GET_MAX_CLOCK_RATE, &msg, sizeof(msg)); 229 if (err) { 230 device_printf(sc->dev, "can't get max clock rate (id=%u)\n", 231 clock_id); 232 return (MSG_ERROR); 233 } 234 235 /* result (Hz) */ 236 rate = (int)msg.resp.rate_hz; 237 DPRINTF("clock = %d(Hz)\n", rate); 238 return (rate); 239 } 240 241 static int 242 bcm2835_cpufreq_get_min_clock_rate(struct bcm2835_cpufreq_softc *sc, 243 uint32_t clock_id) 244 { 245 union msg_get_clock_rate_body msg; 246 int rate; 247 int err; 248 249 /* 250 * Get min clock rate 251 * Tag: 0x00030007 252 * Request: 253 * Length: 4 254 * Value: 255 * u32: clock id 256 * Response: 257 * Length: 8 258 * Value: 259 * u32: clock id 260 * u32: rate (in Hz) 261 */ 262 263 /* setup single tag buffer */ 264 memset(&msg, 0, sizeof(msg)); 265 msg.req.clock_id = clock_id; 266 267 /* call mailbox property */ 268 err = bcm2835_firmware_property(sc->firmware, 269 BCM2835_FIRMWARE_TAG_GET_MIN_CLOCK_RATE, &msg, sizeof(msg)); 270 if (err) { 271 device_printf(sc->dev, "can't get min clock rate (id=%u)\n", 272 clock_id); 273 return (MSG_ERROR); 274 } 275 276 /* result (Hz) */ 277 rate = (int)msg.resp.rate_hz; 278 DPRINTF("clock = %d(Hz)\n", rate); 279 return (rate); 280 } 281 282 static int 283 bcm2835_cpufreq_set_clock_rate(struct bcm2835_cpufreq_softc *sc, 284 uint32_t clock_id, uint32_t rate_hz) 285 { 286 union msg_set_clock_rate_body msg; 287 int rate; 288 int err; 289 290 /* 291 * Set clock rate 292 * Tag: 0x00038002 293 * Request: 294 * Length: 8 295 * Value: 296 * u32: clock id 297 * u32: rate (in Hz) 298 * Response: 299 * Length: 8 300 * Value: 301 * u32: clock id 302 * u32: rate (in Hz) 303 */ 304 305 /* setup single tag buffer */ 306 memset(&msg, 0, sizeof(msg)); 307 msg.req.clock_id = clock_id; 308 msg.req.rate_hz = rate_hz; 309 310 /* call mailbox property */ 311 err = bcm2835_firmware_property(sc->firmware, 312 BCM2835_FIRMWARE_TAG_SET_CLOCK_RATE, &msg, sizeof(msg)); 313 if (err) { 314 device_printf(sc->dev, "can't set clock rate (id=%u)\n", 315 clock_id); 316 return (MSG_ERROR); 317 } 318 319 /* workaround for core clock */ 320 if (clock_id == BCM2835_FIRMWARE_CLOCK_ID_CORE) { 321 /* for safety (may change voltage without changing clock) */ 322 DELAY(TRANSITION_LATENCY); 323 324 /* 325 * XXX: the core clock is unable to change at once, 326 * to change certainly, write it twice now. 327 */ 328 329 /* setup single tag buffer */ 330 memset(&msg, 0, sizeof(msg)); 331 msg.req.clock_id = clock_id; 332 msg.req.rate_hz = rate_hz; 333 334 /* call mailbox property */ 335 err = bcm2835_firmware_property(sc->firmware, 336 BCM2835_FIRMWARE_TAG_SET_CLOCK_RATE, &msg, sizeof(msg)); 337 if (err) { 338 device_printf(sc->dev, 339 "can't set clock rate (id=%u)\n", clock_id); 340 return (MSG_ERROR); 341 } 342 } 343 344 /* result (Hz) */ 345 rate = (int)msg.resp.rate_hz; 346 DPRINTF("clock = %d(Hz)\n", rate); 347 return (rate); 348 } 349 350 static int 351 bcm2835_cpufreq_get_turbo(struct bcm2835_cpufreq_softc *sc) 352 { 353 union msg_get_turbo_body msg; 354 int level; 355 int err; 356 357 /* 358 * Get turbo 359 * Tag: 0x00030009 360 * Request: 361 * Length: 4 362 * Value: 363 * u32: id 364 * Response: 365 * Length: 8 366 * Value: 367 * u32: id 368 * u32: level 369 */ 370 371 /* setup single tag buffer */ 372 memset(&msg, 0, sizeof(msg)); 373 msg.req.id = 0; 374 375 /* call mailbox property */ 376 err = bcm2835_firmware_property(sc->firmware, 377 BCM2835_FIRMWARE_TAG_GET_TURBO, &msg, sizeof(msg)); 378 if (err) { 379 device_printf(sc->dev, "can't get turbo\n"); 380 return (MSG_ERROR); 381 } 382 383 /* result 0=non-turbo, 1=turbo */ 384 level = (int)msg.resp.level; 385 DPRINTF("level = %d\n", level); 386 return (level); 387 } 388 389 static int 390 bcm2835_cpufreq_set_turbo(struct bcm2835_cpufreq_softc *sc, uint32_t level) 391 { 392 union msg_set_turbo_body msg; 393 int value; 394 int err; 395 396 /* 397 * Set turbo 398 * Tag: 0x00038009 399 * Request: 400 * Length: 8 401 * Value: 402 * u32: id 403 * u32: level 404 * Response: 405 * Length: 8 406 * Value: 407 * u32: id 408 * u32: level 409 */ 410 411 /* replace unknown value to OFF */ 412 if (level != BCM2835_FIRMWARE_TURBO_ON && 413 level != BCM2835_FIRMWARE_TURBO_OFF) 414 level = BCM2835_FIRMWARE_TURBO_OFF; 415 416 /* setup single tag buffer */ 417 memset(&msg, 0, sizeof(msg)); 418 msg.req.id = 0; 419 msg.req.level = level; 420 421 /* call mailbox property */ 422 err = bcm2835_firmware_property(sc->firmware, 423 BCM2835_FIRMWARE_TAG_SET_TURBO, &msg, sizeof(msg)); 424 if (err) { 425 device_printf(sc->dev, "can't set turbo\n"); 426 return (MSG_ERROR); 427 } 428 429 /* result 0=non-turbo, 1=turbo */ 430 value = (int)msg.resp.level; 431 DPRINTF("level = %d\n", value); 432 return (value); 433 } 434 435 static int 436 bcm2835_cpufreq_get_voltage(struct bcm2835_cpufreq_softc *sc, 437 uint32_t voltage_id) 438 { 439 union msg_get_voltage_body msg; 440 int value; 441 int err; 442 443 /* 444 * Get voltage 445 * Tag: 0x00030003 446 * Request: 447 * Length: 4 448 * Value: 449 * u32: voltage id 450 * Response: 451 * Length: 8 452 * Value: 453 * u32: voltage id 454 * u32: value (offset from 1.2V in units of 0.025V) 455 */ 456 457 /* setup single tag buffer */ 458 memset(&msg, 0, sizeof(msg)); 459 msg.req.voltage_id = voltage_id; 460 461 /* call mailbox property */ 462 err = bcm2835_firmware_property(sc->firmware, 463 BCM2835_FIRMWARE_TAG_GET_VOLTAGE, &msg, sizeof(msg)); 464 if (err) { 465 device_printf(sc->dev, "can't get voltage\n"); 466 return (MSG_ERROR); 467 } 468 469 /* result (offset from 1.2V) */ 470 value = (int)msg.resp.value; 471 DPRINTF("value = %d\n", value); 472 return (value); 473 } 474 475 static int 476 bcm2835_cpufreq_get_max_voltage(struct bcm2835_cpufreq_softc *sc, 477 uint32_t voltage_id) 478 { 479 union msg_get_voltage_body msg; 480 int value; 481 int err; 482 483 /* 484 * Get voltage 485 * Tag: 0x00030005 486 * Request: 487 * Length: 4 488 * Value: 489 * u32: voltage id 490 * Response: 491 * Length: 8 492 * Value: 493 * u32: voltage id 494 * u32: value (offset from 1.2V in units of 0.025V) 495 */ 496 497 /* setup single tag buffer */ 498 memset(&msg, 0, sizeof(msg)); 499 msg.req.voltage_id = voltage_id; 500 501 /* call mailbox property */ 502 err = bcm2835_firmware_property(sc->firmware, 503 BCM2835_FIRMWARE_TAG_GET_MAX_VOLTAGE, &msg, sizeof(msg)); 504 if (err) { 505 device_printf(sc->dev, "can't get max voltage\n"); 506 return (MSG_ERROR); 507 } 508 509 /* result (offset from 1.2V) */ 510 value = (int)msg.resp.value; 511 DPRINTF("value = %d\n", value); 512 return (value); 513 } 514 static int 515 bcm2835_cpufreq_get_min_voltage(struct bcm2835_cpufreq_softc *sc, 516 uint32_t voltage_id) 517 { 518 union msg_get_voltage_body msg; 519 int value; 520 int err; 521 522 /* 523 * Get voltage 524 * Tag: 0x00030008 525 * Request: 526 * Length: 4 527 * Value: 528 * u32: voltage id 529 * Response: 530 * Length: 8 531 * Value: 532 * u32: voltage id 533 * u32: value (offset from 1.2V in units of 0.025V) 534 */ 535 536 /* setup single tag buffer */ 537 memset(&msg, 0, sizeof(msg)); 538 msg.req.voltage_id = voltage_id; 539 540 /* call mailbox property */ 541 err = bcm2835_firmware_property(sc->firmware, 542 BCM2835_FIRMWARE_TAG_GET_MIN_VOLTAGE, &msg, sizeof(msg)); 543 if (err) { 544 device_printf(sc->dev, "can't get min voltage\n"); 545 return (MSG_ERROR); 546 } 547 548 /* result (offset from 1.2V) */ 549 value = (int)msg.resp.value; 550 DPRINTF("value = %d\n", value); 551 return (value); 552 } 553 554 static int 555 bcm2835_cpufreq_set_voltage(struct bcm2835_cpufreq_softc *sc, 556 uint32_t voltage_id, int32_t value) 557 { 558 union msg_set_voltage_body msg; 559 int err; 560 561 /* 562 * Set voltage 563 * Tag: 0x00038003 564 * Request: 565 * Length: 4 566 * Value: 567 * u32: voltage id 568 * u32: value (offset from 1.2V in units of 0.025V) 569 * Response: 570 * Length: 8 571 * Value: 572 * u32: voltage id 573 * u32: value (offset from 1.2V in units of 0.025V) 574 */ 575 576 /* 577 * over_voltage: 578 * 0 (1.2 V). Values above 6 are only allowed when force_turbo or 579 * current_limit_override are specified (which set the warranty bit). 580 */ 581 if (value > MAX_OVER_VOLTAGE || value < MIN_OVER_VOLTAGE) { 582 /* currently not supported */ 583 device_printf(sc->dev, "not supported voltage: %d\n", value); 584 return (MSG_ERROR); 585 } 586 587 /* setup single tag buffer */ 588 memset(&msg, 0, sizeof(msg)); 589 msg.req.voltage_id = voltage_id; 590 msg.req.value = (uint32_t)value; 591 592 /* call mailbox property */ 593 err = bcm2835_firmware_property(sc->firmware, 594 BCM2835_FIRMWARE_TAG_SET_VOLTAGE, &msg, sizeof(msg)); 595 if (err) { 596 device_printf(sc->dev, "can't set voltage\n"); 597 return (MSG_ERROR); 598 } 599 600 /* result (offset from 1.2V) */ 601 value = (int)msg.resp.value; 602 DPRINTF("value = %d\n", value); 603 return (value); 604 } 605 606 static int 607 bcm2835_cpufreq_get_temperature(struct bcm2835_cpufreq_softc *sc) 608 { 609 union msg_get_temperature_body msg; 610 int value; 611 int err; 612 613 /* 614 * Get temperature 615 * Tag: 0x00030006 616 * Request: 617 * Length: 4 618 * Value: 619 * u32: temperature id 620 * Response: 621 * Length: 8 622 * Value: 623 * u32: temperature id 624 * u32: value 625 */ 626 627 /* setup single tag buffer */ 628 memset(&msg, 0, sizeof(msg)); 629 msg.req.temperature_id = 0; 630 631 /* call mailbox property */ 632 err = bcm2835_firmware_property(sc->firmware, 633 BCM2835_FIRMWARE_TAG_GET_TEMPERATURE, &msg, sizeof(msg)); 634 if (err) { 635 device_printf(sc->dev, "can't get temperature\n"); 636 return (MSG_ERROR); 637 } 638 639 /* result (temperature of degree C) */ 640 value = (int)msg.resp.value; 641 DPRINTF("value = %d\n", value); 642 return (value); 643 } 644 645 static int 646 sysctl_bcm2835_cpufreq_arm_freq(SYSCTL_HANDLER_ARGS) 647 { 648 struct bcm2835_cpufreq_softc *sc = arg1; 649 int val; 650 int err; 651 652 /* get realtime value */ 653 VC_LOCK(sc); 654 val = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM); 655 VC_UNLOCK(sc); 656 if (val == MSG_ERROR) 657 return (EIO); 658 659 err = sysctl_handle_int(oidp, &val, 0, req); 660 if (err || !req->newptr) /* error || read request */ 661 return (err); 662 663 /* write request */ 664 VC_LOCK(sc); 665 err = bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM, 666 val); 667 VC_UNLOCK(sc); 668 if (err == MSG_ERROR) { 669 device_printf(sc->dev, "set clock arm_freq error\n"); 670 return (EIO); 671 } 672 DELAY(TRANSITION_LATENCY); 673 674 return (0); 675 } 676 677 static int 678 sysctl_bcm2835_cpufreq_core_freq(SYSCTL_HANDLER_ARGS) 679 { 680 struct bcm2835_cpufreq_softc *sc = arg1; 681 int val; 682 int err; 683 684 /* get realtime value */ 685 VC_LOCK(sc); 686 val = bcm2835_cpufreq_get_clock_rate(sc, 687 BCM2835_FIRMWARE_CLOCK_ID_CORE); 688 VC_UNLOCK(sc); 689 if (val == MSG_ERROR) 690 return (EIO); 691 692 err = sysctl_handle_int(oidp, &val, 0, req); 693 if (err || !req->newptr) /* error || read request */ 694 return (err); 695 696 /* write request */ 697 VC_LOCK(sc); 698 err = bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE, 699 val); 700 if (err == MSG_ERROR) { 701 VC_UNLOCK(sc); 702 device_printf(sc->dev, "set clock core_freq error\n"); 703 return (EIO); 704 } 705 VC_UNLOCK(sc); 706 DELAY(TRANSITION_LATENCY); 707 708 return (0); 709 } 710 711 static int 712 sysctl_bcm2835_cpufreq_sdram_freq(SYSCTL_HANDLER_ARGS) 713 { 714 struct bcm2835_cpufreq_softc *sc = arg1; 715 int val; 716 int err; 717 718 /* get realtime value */ 719 VC_LOCK(sc); 720 val = bcm2835_cpufreq_get_clock_rate(sc, 721 BCM2835_FIRMWARE_CLOCK_ID_SDRAM); 722 VC_UNLOCK(sc); 723 if (val == MSG_ERROR) 724 return (EIO); 725 726 err = sysctl_handle_int(oidp, &val, 0, req); 727 if (err || !req->newptr) /* error || read request */ 728 return (err); 729 730 /* write request */ 731 VC_LOCK(sc); 732 err = bcm2835_cpufreq_set_clock_rate(sc, 733 BCM2835_FIRMWARE_CLOCK_ID_SDRAM, val); 734 VC_UNLOCK(sc); 735 if (err == MSG_ERROR) { 736 device_printf(sc->dev, "set clock sdram_freq error\n"); 737 return (EIO); 738 } 739 DELAY(TRANSITION_LATENCY); 740 741 return (0); 742 } 743 744 static int 745 sysctl_bcm2835_cpufreq_turbo(SYSCTL_HANDLER_ARGS) 746 { 747 struct bcm2835_cpufreq_softc *sc = arg1; 748 int val; 749 int err; 750 751 /* get realtime value */ 752 VC_LOCK(sc); 753 val = bcm2835_cpufreq_get_turbo(sc); 754 VC_UNLOCK(sc); 755 if (val == MSG_ERROR) 756 return (EIO); 757 758 err = sysctl_handle_int(oidp, &val, 0, req); 759 if (err || !req->newptr) /* error || read request */ 760 return (err); 761 762 /* write request */ 763 if (val > 0) 764 sc->turbo_mode = BCM2835_FIRMWARE_TURBO_ON; 765 else 766 sc->turbo_mode = BCM2835_FIRMWARE_TURBO_OFF; 767 768 VC_LOCK(sc); 769 err = bcm2835_cpufreq_set_turbo(sc, sc->turbo_mode); 770 VC_UNLOCK(sc); 771 if (err == MSG_ERROR) { 772 device_printf(sc->dev, "set turbo error\n"); 773 return (EIO); 774 } 775 DELAY(TRANSITION_LATENCY); 776 777 return (0); 778 } 779 780 static int 781 sysctl_bcm2835_cpufreq_voltage_core(SYSCTL_HANDLER_ARGS) 782 { 783 struct bcm2835_cpufreq_softc *sc = arg1; 784 int val; 785 int err; 786 787 /* get realtime value */ 788 VC_LOCK(sc); 789 val = bcm2835_cpufreq_get_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_CORE); 790 VC_UNLOCK(sc); 791 if (val == MSG_ERROR) 792 return (EIO); 793 794 err = sysctl_handle_int(oidp, &val, 0, req); 795 if (err || !req->newptr) /* error || read request */ 796 return (err); 797 798 /* write request */ 799 if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) 800 return (EINVAL); 801 sc->voltage_core = val; 802 803 VC_LOCK(sc); 804 err = bcm2835_cpufreq_set_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_CORE, 805 sc->voltage_core); 806 VC_UNLOCK(sc); 807 if (err == MSG_ERROR) { 808 device_printf(sc->dev, "set voltage core error\n"); 809 return (EIO); 810 } 811 DELAY(TRANSITION_LATENCY); 812 813 return (0); 814 } 815 816 static int 817 sysctl_bcm2835_cpufreq_voltage_sdram_c(SYSCTL_HANDLER_ARGS) 818 { 819 struct bcm2835_cpufreq_softc *sc = arg1; 820 int val; 821 int err; 822 823 /* get realtime value */ 824 VC_LOCK(sc); 825 val = bcm2835_cpufreq_get_voltage(sc, 826 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C); 827 VC_UNLOCK(sc); 828 if (val == MSG_ERROR) 829 return (EIO); 830 831 err = sysctl_handle_int(oidp, &val, 0, req); 832 if (err || !req->newptr) /* error || read request */ 833 return (err); 834 835 /* write request */ 836 if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) 837 return (EINVAL); 838 sc->voltage_sdram_c = val; 839 840 VC_LOCK(sc); 841 err = bcm2835_cpufreq_set_voltage(sc, 842 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C, 843 sc->voltage_sdram_c); 844 VC_UNLOCK(sc); 845 if (err == MSG_ERROR) { 846 device_printf(sc->dev, "set voltage sdram_c error\n"); 847 return (EIO); 848 } 849 DELAY(TRANSITION_LATENCY); 850 851 return (0); 852 } 853 854 static int 855 sysctl_bcm2835_cpufreq_voltage_sdram_i(SYSCTL_HANDLER_ARGS) 856 { 857 struct bcm2835_cpufreq_softc *sc = arg1; 858 int val; 859 int err; 860 861 /* get realtime value */ 862 VC_LOCK(sc); 863 val = bcm2835_cpufreq_get_voltage(sc, 864 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I); 865 VC_UNLOCK(sc); 866 if (val == MSG_ERROR) 867 return (EIO); 868 869 err = sysctl_handle_int(oidp, &val, 0, req); 870 if (err || !req->newptr) /* error || read request */ 871 return (err); 872 873 /* write request */ 874 if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) 875 return (EINVAL); 876 sc->voltage_sdram_i = val; 877 878 VC_LOCK(sc); 879 err = bcm2835_cpufreq_set_voltage(sc, 880 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I, sc->voltage_sdram_i); 881 VC_UNLOCK(sc); 882 if (err == MSG_ERROR) { 883 device_printf(sc->dev, "set voltage sdram_i error\n"); 884 return (EIO); 885 } 886 DELAY(TRANSITION_LATENCY); 887 888 return (0); 889 } 890 891 static int 892 sysctl_bcm2835_cpufreq_voltage_sdram_p(SYSCTL_HANDLER_ARGS) 893 { 894 struct bcm2835_cpufreq_softc *sc = arg1; 895 int val; 896 int err; 897 898 /* get realtime value */ 899 VC_LOCK(sc); 900 val = bcm2835_cpufreq_get_voltage(sc, 901 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P); 902 VC_UNLOCK(sc); 903 if (val == MSG_ERROR) 904 return (EIO); 905 906 err = sysctl_handle_int(oidp, &val, 0, req); 907 if (err || !req->newptr) /* error || read request */ 908 return (err); 909 910 /* write request */ 911 if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) 912 return (EINVAL); 913 sc->voltage_sdram_p = val; 914 915 VC_LOCK(sc); 916 err = bcm2835_cpufreq_set_voltage(sc, 917 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P, sc->voltage_sdram_p); 918 VC_UNLOCK(sc); 919 if (err == MSG_ERROR) { 920 device_printf(sc->dev, "set voltage sdram_p error\n"); 921 return (EIO); 922 } 923 DELAY(TRANSITION_LATENCY); 924 925 return (0); 926 } 927 928 static int 929 sysctl_bcm2835_cpufreq_voltage_sdram(SYSCTL_HANDLER_ARGS) 930 { 931 struct bcm2835_cpufreq_softc *sc = arg1; 932 int val; 933 int err; 934 935 /* multiple write only */ 936 if (!req->newptr) 937 return (EINVAL); 938 val = 0; 939 err = sysctl_handle_int(oidp, &val, 0, req); 940 if (err) 941 return (err); 942 943 /* write request */ 944 if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) 945 return (EINVAL); 946 sc->voltage_sdram = val; 947 948 VC_LOCK(sc); 949 err = bcm2835_cpufreq_set_voltage(sc, 950 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C, val); 951 if (err == MSG_ERROR) { 952 VC_UNLOCK(sc); 953 device_printf(sc->dev, "set voltage sdram_c error\n"); 954 return (EIO); 955 } 956 err = bcm2835_cpufreq_set_voltage(sc, 957 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I, val); 958 if (err == MSG_ERROR) { 959 VC_UNLOCK(sc); 960 device_printf(sc->dev, "set voltage sdram_i error\n"); 961 return (EIO); 962 } 963 err = bcm2835_cpufreq_set_voltage(sc, 964 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P, val); 965 if (err == MSG_ERROR) { 966 VC_UNLOCK(sc); 967 device_printf(sc->dev, "set voltage sdram_p error\n"); 968 return (EIO); 969 } 970 VC_UNLOCK(sc); 971 DELAY(TRANSITION_LATENCY); 972 973 return (0); 974 } 975 976 static int 977 sysctl_bcm2835_cpufreq_temperature(SYSCTL_HANDLER_ARGS) 978 { 979 struct bcm2835_cpufreq_softc *sc = arg1; 980 int val; 981 int err; 982 983 /* get realtime value */ 984 VC_LOCK(sc); 985 val = bcm2835_cpufreq_get_temperature(sc); 986 VC_UNLOCK(sc); 987 if (val == MSG_ERROR) 988 return (EIO); 989 990 err = sysctl_handle_int(oidp, &val, 0, req); 991 if (err || !req->newptr) /* error || read request */ 992 return (err); 993 994 /* write request */ 995 return (EINVAL); 996 } 997 998 static int 999 sysctl_bcm2835_devcpu_temperature(SYSCTL_HANDLER_ARGS) 1000 { 1001 struct bcm2835_cpufreq_softc *sc = arg1; 1002 int val; 1003 int err; 1004 1005 /* get realtime value */ 1006 VC_LOCK(sc); 1007 val = bcm2835_cpufreq_get_temperature(sc); 1008 VC_UNLOCK(sc); 1009 if (val == MSG_ERROR) 1010 return (EIO); 1011 1012 /* 1/1000 celsius (raw) to 1/10 kelvin */ 1013 val = val / 100 + TZ_ZEROC; 1014 1015 err = sysctl_handle_int(oidp, &val, 0, req); 1016 if (err || !req->newptr) /* error || read request */ 1017 return (err); 1018 1019 /* write request */ 1020 return (EINVAL); 1021 } 1022 1023 static void 1024 bcm2835_cpufreq_init(void *arg) 1025 { 1026 struct bcm2835_cpufreq_softc *sc = arg; 1027 struct sysctl_ctx_list *ctx; 1028 device_t cpu; 1029 int arm_freq, core_freq, sdram_freq; 1030 int arm_max_freq, arm_min_freq, core_max_freq, core_min_freq; 1031 int sdram_max_freq, sdram_min_freq; 1032 int voltage_core, voltage_sdram_c, voltage_sdram_i, voltage_sdram_p; 1033 int max_voltage_core, min_voltage_core; 1034 int max_voltage_sdram_c, min_voltage_sdram_c; 1035 int max_voltage_sdram_i, min_voltage_sdram_i; 1036 int max_voltage_sdram_p, min_voltage_sdram_p; 1037 int turbo, temperature; 1038 1039 VC_LOCK(sc); 1040 1041 /* current clock */ 1042 arm_freq = bcm2835_cpufreq_get_clock_rate(sc, 1043 BCM2835_FIRMWARE_CLOCK_ID_ARM); 1044 core_freq = bcm2835_cpufreq_get_clock_rate(sc, 1045 BCM2835_FIRMWARE_CLOCK_ID_CORE); 1046 sdram_freq = bcm2835_cpufreq_get_clock_rate(sc, 1047 BCM2835_FIRMWARE_CLOCK_ID_SDRAM); 1048 1049 /* max/min clock */ 1050 arm_max_freq = bcm2835_cpufreq_get_max_clock_rate(sc, 1051 BCM2835_FIRMWARE_CLOCK_ID_ARM); 1052 arm_min_freq = bcm2835_cpufreq_get_min_clock_rate(sc, 1053 BCM2835_FIRMWARE_CLOCK_ID_ARM); 1054 core_max_freq = bcm2835_cpufreq_get_max_clock_rate(sc, 1055 BCM2835_FIRMWARE_CLOCK_ID_CORE); 1056 core_min_freq = bcm2835_cpufreq_get_min_clock_rate(sc, 1057 BCM2835_FIRMWARE_CLOCK_ID_CORE); 1058 sdram_max_freq = bcm2835_cpufreq_get_max_clock_rate(sc, 1059 BCM2835_FIRMWARE_CLOCK_ID_SDRAM); 1060 sdram_min_freq = bcm2835_cpufreq_get_min_clock_rate(sc, 1061 BCM2835_FIRMWARE_CLOCK_ID_SDRAM); 1062 1063 /* turbo mode */ 1064 turbo = bcm2835_cpufreq_get_turbo(sc); 1065 if (turbo > 0) 1066 sc->turbo_mode = BCM2835_FIRMWARE_TURBO_ON; 1067 else 1068 sc->turbo_mode = BCM2835_FIRMWARE_TURBO_OFF; 1069 1070 /* voltage */ 1071 voltage_core = bcm2835_cpufreq_get_voltage(sc, 1072 BCM2835_FIRMWARE_VOLTAGE_ID_CORE); 1073 voltage_sdram_c = bcm2835_cpufreq_get_voltage(sc, 1074 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C); 1075 voltage_sdram_i = bcm2835_cpufreq_get_voltage(sc, 1076 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I); 1077 voltage_sdram_p = bcm2835_cpufreq_get_voltage(sc, 1078 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P); 1079 1080 /* current values (offset from 1.2V) */ 1081 sc->voltage_core = voltage_core; 1082 sc->voltage_sdram = voltage_sdram_c; 1083 sc->voltage_sdram_c = voltage_sdram_c; 1084 sc->voltage_sdram_i = voltage_sdram_i; 1085 sc->voltage_sdram_p = voltage_sdram_p; 1086 1087 /* max/min voltage */ 1088 max_voltage_core = bcm2835_cpufreq_get_max_voltage(sc, 1089 BCM2835_FIRMWARE_VOLTAGE_ID_CORE); 1090 min_voltage_core = bcm2835_cpufreq_get_min_voltage(sc, 1091 BCM2835_FIRMWARE_VOLTAGE_ID_CORE); 1092 max_voltage_sdram_c = bcm2835_cpufreq_get_max_voltage(sc, 1093 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C); 1094 max_voltage_sdram_i = bcm2835_cpufreq_get_max_voltage(sc, 1095 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I); 1096 max_voltage_sdram_p = bcm2835_cpufreq_get_max_voltage(sc, 1097 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P); 1098 min_voltage_sdram_c = bcm2835_cpufreq_get_min_voltage(sc, 1099 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C); 1100 min_voltage_sdram_i = bcm2835_cpufreq_get_min_voltage(sc, 1101 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I); 1102 min_voltage_sdram_p = bcm2835_cpufreq_get_min_voltage(sc, 1103 BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P); 1104 1105 /* temperature */ 1106 temperature = bcm2835_cpufreq_get_temperature(sc); 1107 1108 /* show result */ 1109 if (cpufreq_verbose || bootverbose) { 1110 device_printf(sc->dev, "Boot settings:\n"); 1111 device_printf(sc->dev, 1112 "current ARM %dMHz, Core %dMHz, SDRAM %dMHz, Turbo %s\n", 1113 HZ2MHZ(arm_freq), HZ2MHZ(core_freq), HZ2MHZ(sdram_freq), 1114 (sc->turbo_mode == BCM2835_FIRMWARE_TURBO_ON) ? "ON":"OFF"); 1115 1116 device_printf(sc->dev, 1117 "max/min ARM %d/%dMHz, Core %d/%dMHz, SDRAM %d/%dMHz\n", 1118 HZ2MHZ(arm_max_freq), HZ2MHZ(arm_min_freq), 1119 HZ2MHZ(core_max_freq), HZ2MHZ(core_min_freq), 1120 HZ2MHZ(sdram_max_freq), HZ2MHZ(sdram_min_freq)); 1121 1122 device_printf(sc->dev, 1123 "current Core %dmV, SDRAM_C %dmV, SDRAM_I %dmV, " 1124 "SDRAM_P %dmV\n", 1125 OFFSET2MVOLT(voltage_core), OFFSET2MVOLT(voltage_sdram_c), 1126 OFFSET2MVOLT(voltage_sdram_i), 1127 OFFSET2MVOLT(voltage_sdram_p)); 1128 1129 device_printf(sc->dev, 1130 "max/min Core %d/%dmV, SDRAM_C %d/%dmV, SDRAM_I %d/%dmV, " 1131 "SDRAM_P %d/%dmV\n", 1132 OFFSET2MVOLT(max_voltage_core), 1133 OFFSET2MVOLT(min_voltage_core), 1134 OFFSET2MVOLT(max_voltage_sdram_c), 1135 OFFSET2MVOLT(min_voltage_sdram_c), 1136 OFFSET2MVOLT(max_voltage_sdram_i), 1137 OFFSET2MVOLT(min_voltage_sdram_i), 1138 OFFSET2MVOLT(max_voltage_sdram_p), 1139 OFFSET2MVOLT(min_voltage_sdram_p)); 1140 1141 device_printf(sc->dev, 1142 "Temperature %d.%dC\n", (temperature / 1000), 1143 (temperature % 1000) / 100); 1144 } else { /* !cpufreq_verbose && !bootverbose */ 1145 device_printf(sc->dev, 1146 "ARM %dMHz, Core %dMHz, SDRAM %dMHz, Turbo %s\n", 1147 HZ2MHZ(arm_freq), HZ2MHZ(core_freq), HZ2MHZ(sdram_freq), 1148 (sc->turbo_mode == BCM2835_FIRMWARE_TURBO_ON) ? "ON":"OFF"); 1149 } 1150 1151 /* keep in softc (MHz/mV) */ 1152 sc->arm_max_freq = HZ2MHZ(arm_max_freq); 1153 sc->arm_min_freq = HZ2MHZ(arm_min_freq); 1154 sc->core_max_freq = HZ2MHZ(core_max_freq); 1155 sc->core_min_freq = HZ2MHZ(core_min_freq); 1156 sc->sdram_max_freq = HZ2MHZ(sdram_max_freq); 1157 sc->sdram_min_freq = HZ2MHZ(sdram_min_freq); 1158 sc->max_voltage_core = OFFSET2MVOLT(max_voltage_core); 1159 sc->min_voltage_core = OFFSET2MVOLT(min_voltage_core); 1160 1161 /* if turbo is on, set to max values */ 1162 if (sc->turbo_mode == BCM2835_FIRMWARE_TURBO_ON) { 1163 bcm2835_cpufreq_set_clock_rate(sc, 1164 BCM2835_FIRMWARE_CLOCK_ID_ARM, arm_max_freq); 1165 DELAY(TRANSITION_LATENCY); 1166 bcm2835_cpufreq_set_clock_rate(sc, 1167 BCM2835_FIRMWARE_CLOCK_ID_CORE, core_max_freq); 1168 DELAY(TRANSITION_LATENCY); 1169 bcm2835_cpufreq_set_clock_rate(sc, 1170 BCM2835_FIRMWARE_CLOCK_ID_SDRAM, sdram_max_freq); 1171 DELAY(TRANSITION_LATENCY); 1172 } else { 1173 bcm2835_cpufreq_set_clock_rate(sc, 1174 BCM2835_FIRMWARE_CLOCK_ID_ARM, arm_min_freq); 1175 DELAY(TRANSITION_LATENCY); 1176 bcm2835_cpufreq_set_clock_rate(sc, 1177 BCM2835_FIRMWARE_CLOCK_ID_CORE, core_min_freq); 1178 DELAY(TRANSITION_LATENCY); 1179 bcm2835_cpufreq_set_clock_rate(sc, 1180 BCM2835_FIRMWARE_CLOCK_ID_SDRAM, sdram_min_freq); 1181 DELAY(TRANSITION_LATENCY); 1182 } 1183 1184 VC_UNLOCK(sc); 1185 1186 /* add human readable temperature to dev.cpu node */ 1187 cpu = device_get_parent(sc->dev); 1188 if (cpu != NULL) { 1189 ctx = device_get_sysctl_ctx(cpu); 1190 SYSCTL_ADD_PROC(ctx, 1191 SYSCTL_CHILDREN(device_get_sysctl_tree(cpu)), OID_AUTO, 1192 "temperature", 1193 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, sc, 0, 1194 sysctl_bcm2835_devcpu_temperature, "IK", 1195 "Current SoC temperature"); 1196 } 1197 1198 /* release this hook (continue boot) */ 1199 config_intrhook_disestablish(&sc->init_hook); 1200 } 1201 1202 static void 1203 bcm2835_cpufreq_identify(driver_t *driver, device_t parent) 1204 { 1205 const struct ofw_compat_data *compat; 1206 phandle_t root; 1207 1208 root = OF_finddevice("/"); 1209 for (compat = compat_data; compat->ocd_str != NULL; compat++) 1210 if (ofw_bus_node_is_compatible(root, compat->ocd_str)) 1211 break; 1212 1213 if (compat->ocd_data == 0) 1214 return; 1215 1216 DPRINTF("driver=%p, parent=%p\n", driver, parent); 1217 if (device_find_child(parent, "bcm2835_cpufreq", -1) != NULL) 1218 return; 1219 if (BUS_ADD_CHILD(parent, 0, "bcm2835_cpufreq", -1) == NULL) 1220 device_printf(parent, "add child failed\n"); 1221 } 1222 1223 static int 1224 bcm2835_cpufreq_probe(device_t dev) 1225 { 1226 1227 if (device_get_unit(dev) != 0) 1228 return (ENXIO); 1229 device_set_desc(dev, "CPU Frequency Control"); 1230 1231 return (0); 1232 } 1233 1234 static int 1235 bcm2835_cpufreq_attach(device_t dev) 1236 { 1237 struct bcm2835_cpufreq_softc *sc; 1238 struct sysctl_oid *oid; 1239 1240 /* set self dev */ 1241 sc = device_get_softc(dev); 1242 sc->dev = dev; 1243 sc->firmware = devclass_get_device( 1244 devclass_find("bcm2835_firmware"), 0); 1245 if (sc->firmware == NULL) { 1246 device_printf(dev, "Unable to find firmware device\n"); 1247 return (ENXIO); 1248 } 1249 1250 /* initial values */ 1251 sc->arm_max_freq = -1; 1252 sc->arm_min_freq = -1; 1253 sc->core_max_freq = -1; 1254 sc->core_min_freq = -1; 1255 sc->sdram_max_freq = -1; 1256 sc->sdram_min_freq = -1; 1257 sc->max_voltage_core = 0; 1258 sc->min_voltage_core = 0; 1259 1260 /* setup sysctl at first device */ 1261 if (device_get_unit(dev) == 0) { 1262 sysctl_ctx_init(&bcm2835_sysctl_ctx); 1263 /* create node for hw.cpufreq */ 1264 oid = SYSCTL_ADD_NODE(&bcm2835_sysctl_ctx, 1265 SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO, "cpufreq", 1266 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, ""); 1267 1268 /* Frequency (Hz) */ 1269 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1270 OID_AUTO, "arm_freq", 1271 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, 1272 sysctl_bcm2835_cpufreq_arm_freq, "IU", 1273 "ARM frequency (Hz)"); 1274 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1275 OID_AUTO, "core_freq", 1276 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, 1277 sysctl_bcm2835_cpufreq_core_freq, "IU", 1278 "Core frequency (Hz)"); 1279 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1280 OID_AUTO, "sdram_freq", 1281 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, 1282 sysctl_bcm2835_cpufreq_sdram_freq, "IU", 1283 "SDRAM frequency (Hz)"); 1284 1285 /* Turbo state */ 1286 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1287 OID_AUTO, "turbo", 1288 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, 1289 sysctl_bcm2835_cpufreq_turbo, "IU", 1290 "Disables dynamic clocking"); 1291 1292 /* Voltage (offset from 1.2V in units of 0.025V) */ 1293 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1294 OID_AUTO, "voltage_core", 1295 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, 1296 sysctl_bcm2835_cpufreq_voltage_core, "I", 1297 "ARM/GPU core voltage" 1298 "(offset from 1.2V in units of 0.025V)"); 1299 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1300 OID_AUTO, "voltage_sdram", 1301 CTLTYPE_INT | CTLFLAG_WR | CTLFLAG_NEEDGIANT, sc, 1302 0, sysctl_bcm2835_cpufreq_voltage_sdram, "I", 1303 "SDRAM voltage (offset from 1.2V in units of 0.025V)"); 1304 1305 /* Voltage individual SDRAM */ 1306 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1307 OID_AUTO, "voltage_sdram_c", 1308 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 1309 0, sysctl_bcm2835_cpufreq_voltage_sdram_c, "I", 1310 "SDRAM controller voltage" 1311 "(offset from 1.2V in units of 0.025V)"); 1312 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1313 OID_AUTO, "voltage_sdram_i", 1314 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 1315 0, sysctl_bcm2835_cpufreq_voltage_sdram_i, "I", 1316 "SDRAM I/O voltage (offset from 1.2V in units of 0.025V)"); 1317 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1318 OID_AUTO, "voltage_sdram_p", 1319 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 1320 0, sysctl_bcm2835_cpufreq_voltage_sdram_p, "I", 1321 "SDRAM phy voltage (offset from 1.2V in units of 0.025V)"); 1322 1323 /* Temperature */ 1324 SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), 1325 OID_AUTO, "temperature", 1326 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, sc, 0, 1327 sysctl_bcm2835_cpufreq_temperature, "I", 1328 "SoC temperature (thousandths of a degree C)"); 1329 } 1330 1331 /* ARM->VC lock */ 1332 sema_init(&vc_sema, 1, "vcsema"); 1333 1334 /* register callback for using mbox when interrupts are enabled */ 1335 sc->init_hook.ich_func = bcm2835_cpufreq_init; 1336 sc->init_hook.ich_arg = sc; 1337 1338 if (config_intrhook_establish(&sc->init_hook) != 0) { 1339 device_printf(dev, "config_intrhook_establish failed\n"); 1340 return (ENOMEM); 1341 } 1342 1343 /* this device is controlled by cpufreq(4) */ 1344 cpufreq_register(dev); 1345 1346 return (0); 1347 } 1348 1349 static int 1350 bcm2835_cpufreq_detach(device_t dev) 1351 { 1352 1353 sema_destroy(&vc_sema); 1354 1355 return (cpufreq_unregister(dev)); 1356 } 1357 1358 static int 1359 bcm2835_cpufreq_set(device_t dev, const struct cf_setting *cf) 1360 { 1361 struct bcm2835_cpufreq_softc *sc; 1362 uint32_t rate_hz, rem; 1363 int resp_freq, arm_freq, min_freq, core_freq; 1364 #ifdef DEBUG 1365 int cur_freq; 1366 #endif 1367 1368 if (cf == NULL || cf->freq < 0) 1369 return (EINVAL); 1370 1371 sc = device_get_softc(dev); 1372 1373 /* setting clock (Hz) */ 1374 rate_hz = (uint32_t)MHZ2HZ(cf->freq); 1375 rem = rate_hz % HZSTEP; 1376 rate_hz -= rem; 1377 if (rate_hz == 0) 1378 return (EINVAL); 1379 1380 /* adjust min freq */ 1381 min_freq = sc->arm_min_freq; 1382 if (sc->turbo_mode != BCM2835_FIRMWARE_TURBO_ON) 1383 if (min_freq > cpufreq_lowest_freq) 1384 min_freq = cpufreq_lowest_freq; 1385 1386 if (rate_hz < MHZ2HZ(min_freq) || rate_hz > MHZ2HZ(sc->arm_max_freq)) 1387 return (EINVAL); 1388 1389 /* set new value and verify it */ 1390 VC_LOCK(sc); 1391 #ifdef DEBUG 1392 cur_freq = bcm2835_cpufreq_get_clock_rate(sc, 1393 BCM2835_FIRMWARE_CLOCK_ID_ARM); 1394 #endif 1395 resp_freq = bcm2835_cpufreq_set_clock_rate(sc, 1396 BCM2835_FIRMWARE_CLOCK_ID_ARM, rate_hz); 1397 DELAY(TRANSITION_LATENCY); 1398 arm_freq = bcm2835_cpufreq_get_clock_rate(sc, 1399 BCM2835_FIRMWARE_CLOCK_ID_ARM); 1400 1401 /* 1402 * if non-turbo and lower than or equal min_freq, 1403 * clock down core and sdram to default first. 1404 */ 1405 if (sc->turbo_mode != BCM2835_FIRMWARE_TURBO_ON) { 1406 core_freq = bcm2835_cpufreq_get_clock_rate(sc, 1407 BCM2835_FIRMWARE_CLOCK_ID_CORE); 1408 if (rate_hz > MHZ2HZ(sc->arm_min_freq)) { 1409 bcm2835_cpufreq_set_clock_rate(sc, 1410 BCM2835_FIRMWARE_CLOCK_ID_CORE, 1411 MHZ2HZ(sc->core_max_freq)); 1412 DELAY(TRANSITION_LATENCY); 1413 bcm2835_cpufreq_set_clock_rate(sc, 1414 BCM2835_FIRMWARE_CLOCK_ID_SDRAM, 1415 MHZ2HZ(sc->sdram_max_freq)); 1416 DELAY(TRANSITION_LATENCY); 1417 } else { 1418 if (sc->core_min_freq < DEFAULT_CORE_FREQUENCY && 1419 core_freq > DEFAULT_CORE_FREQUENCY) { 1420 /* first, down to 250, then down to min */ 1421 DELAY(TRANSITION_LATENCY); 1422 bcm2835_cpufreq_set_clock_rate(sc, 1423 BCM2835_FIRMWARE_CLOCK_ID_CORE, 1424 MHZ2HZ(DEFAULT_CORE_FREQUENCY)); 1425 DELAY(TRANSITION_LATENCY); 1426 /* reset core voltage */ 1427 bcm2835_cpufreq_set_voltage(sc, 1428 BCM2835_FIRMWARE_VOLTAGE_ID_CORE, 0); 1429 DELAY(TRANSITION_LATENCY); 1430 } 1431 bcm2835_cpufreq_set_clock_rate(sc, 1432 BCM2835_FIRMWARE_CLOCK_ID_CORE, 1433 MHZ2HZ(sc->core_min_freq)); 1434 DELAY(TRANSITION_LATENCY); 1435 bcm2835_cpufreq_set_clock_rate(sc, 1436 BCM2835_FIRMWARE_CLOCK_ID_SDRAM, 1437 MHZ2HZ(sc->sdram_min_freq)); 1438 DELAY(TRANSITION_LATENCY); 1439 } 1440 } 1441 1442 VC_UNLOCK(sc); 1443 1444 if (resp_freq < 0 || arm_freq < 0 || resp_freq != arm_freq) { 1445 device_printf(dev, "wrong freq\n"); 1446 return (EIO); 1447 } 1448 DPRINTF("cpufreq: %d -> %d\n", cur_freq, arm_freq); 1449 1450 return (0); 1451 } 1452 1453 static int 1454 bcm2835_cpufreq_get(device_t dev, struct cf_setting *cf) 1455 { 1456 struct bcm2835_cpufreq_softc *sc; 1457 int arm_freq; 1458 1459 if (cf == NULL) 1460 return (EINVAL); 1461 1462 sc = device_get_softc(dev); 1463 memset(cf, CPUFREQ_VAL_UNKNOWN, sizeof(*cf)); 1464 cf->dev = NULL; 1465 1466 /* get cuurent value */ 1467 VC_LOCK(sc); 1468 arm_freq = bcm2835_cpufreq_get_clock_rate(sc, 1469 BCM2835_FIRMWARE_CLOCK_ID_ARM); 1470 VC_UNLOCK(sc); 1471 if (arm_freq < 0) { 1472 device_printf(dev, "can't get clock\n"); 1473 return (EINVAL); 1474 } 1475 1476 /* CPU clock in MHz or 100ths of a percent. */ 1477 cf->freq = HZ2MHZ(arm_freq); 1478 /* Voltage in mV. */ 1479 cf->volts = CPUFREQ_VAL_UNKNOWN; 1480 /* Power consumed in mW. */ 1481 cf->power = CPUFREQ_VAL_UNKNOWN; 1482 /* Transition latency in us. */ 1483 cf->lat = TRANSITION_LATENCY; 1484 /* Driver providing this setting. */ 1485 cf->dev = dev; 1486 1487 return (0); 1488 } 1489 1490 static int 1491 bcm2835_cpufreq_make_freq_list(device_t dev, struct cf_setting *sets, 1492 int *count) 1493 { 1494 struct bcm2835_cpufreq_softc *sc; 1495 int freq, min_freq, volts, rem; 1496 int idx; 1497 1498 sc = device_get_softc(dev); 1499 freq = sc->arm_max_freq; 1500 min_freq = sc->arm_min_freq; 1501 1502 /* adjust head freq to STEP */ 1503 rem = freq % MHZSTEP; 1504 freq -= rem; 1505 if (freq < min_freq) 1506 freq = min_freq; 1507 1508 /* if non-turbo, add extra low freq */ 1509 if (sc->turbo_mode != BCM2835_FIRMWARE_TURBO_ON) 1510 if (min_freq > cpufreq_lowest_freq) 1511 min_freq = cpufreq_lowest_freq; 1512 1513 #ifdef SOC_BCM2835 1514 /* from freq to min_freq */ 1515 for (idx = 0; idx < *count && freq >= min_freq; idx++) { 1516 if (freq > sc->arm_min_freq) 1517 volts = sc->max_voltage_core; 1518 else 1519 volts = sc->min_voltage_core; 1520 sets[idx].freq = freq; 1521 sets[idx].volts = volts; 1522 sets[idx].lat = TRANSITION_LATENCY; 1523 sets[idx].dev = dev; 1524 freq -= MHZSTEP; 1525 } 1526 #else 1527 /* XXX RPi2 have only 900/600MHz */ 1528 idx = 0; 1529 volts = sc->min_voltage_core; 1530 sets[idx].freq = freq; 1531 sets[idx].volts = volts; 1532 sets[idx].lat = TRANSITION_LATENCY; 1533 sets[idx].dev = dev; 1534 idx++; 1535 if (freq != min_freq) { 1536 sets[idx].freq = min_freq; 1537 sets[idx].volts = volts; 1538 sets[idx].lat = TRANSITION_LATENCY; 1539 sets[idx].dev = dev; 1540 idx++; 1541 } 1542 #endif 1543 *count = idx; 1544 1545 return (0); 1546 } 1547 1548 static int 1549 bcm2835_cpufreq_settings(device_t dev, struct cf_setting *sets, int *count) 1550 { 1551 struct bcm2835_cpufreq_softc *sc; 1552 1553 if (sets == NULL || count == NULL) 1554 return (EINVAL); 1555 1556 sc = device_get_softc(dev); 1557 if (sc->arm_min_freq < 0 || sc->arm_max_freq < 0) { 1558 printf("device is not configured\n"); 1559 return (EINVAL); 1560 } 1561 1562 /* fill data with unknown value */ 1563 memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * (*count)); 1564 /* create new array up to count */ 1565 bcm2835_cpufreq_make_freq_list(dev, sets, count); 1566 1567 return (0); 1568 } 1569 1570 static int 1571 bcm2835_cpufreq_type(device_t dev, int *type) 1572 { 1573 1574 if (type == NULL) 1575 return (EINVAL); 1576 *type = CPUFREQ_TYPE_ABSOLUTE; 1577 1578 return (0); 1579 } 1580 1581 static device_method_t bcm2835_cpufreq_methods[] = { 1582 /* Device interface */ 1583 DEVMETHOD(device_identify, bcm2835_cpufreq_identify), 1584 DEVMETHOD(device_probe, bcm2835_cpufreq_probe), 1585 DEVMETHOD(device_attach, bcm2835_cpufreq_attach), 1586 DEVMETHOD(device_detach, bcm2835_cpufreq_detach), 1587 1588 /* cpufreq interface */ 1589 DEVMETHOD(cpufreq_drv_set, bcm2835_cpufreq_set), 1590 DEVMETHOD(cpufreq_drv_get, bcm2835_cpufreq_get), 1591 DEVMETHOD(cpufreq_drv_settings, bcm2835_cpufreq_settings), 1592 DEVMETHOD(cpufreq_drv_type, bcm2835_cpufreq_type), 1593 1594 DEVMETHOD_END 1595 }; 1596 1597 static driver_t bcm2835_cpufreq_driver = { 1598 "bcm2835_cpufreq", 1599 bcm2835_cpufreq_methods, 1600 sizeof(struct bcm2835_cpufreq_softc), 1601 }; 1602 1603 DRIVER_MODULE(bcm2835_cpufreq, cpu, bcm2835_cpufreq_driver, 0, 0); 1604 MODULE_DEPEND(bcm2835_cpufreq, bcm2835_firmware, 1, 1, 1);
Cache object: 2da030a9600a970f3a24fbdde26157ee
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