pcrtc.c revision 141594
1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz and Don Ahn. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)clock.c 7.2 (Berkeley) 5/12/91 33 * $FreeBSD: head/sys/pc98/cbus/pcrtc.c 141594 2005-02-09 22:48:22Z jhb $ 34 */ 35 36/* 37 * Routines to handle clock hardware. 38 */ 39 40/* 41 * inittodr, settodr and support routines written 42 * by Christoph Robitschko <chmr@edvz.tu-graz.ac.at> 43 * 44 * reintroduced and updated by Chris Stenton <chris@gnome.co.uk> 8/10/94 45 */ 46 47/* 48 * modified for PC98 by Kakefuda 49 */ 50 51#include "opt_apic.h" 52#include "opt_clock.h" 53#include "opt_isa.h" 54#include "opt_mca.h" 55 56#include <sys/param.h> 57#include <sys/systm.h> 58#include <sys/bus.h> 59#include <sys/lock.h> 60#include <sys/kdb.h> 61#include <sys/mutex.h> 62#include <sys/proc.h> 63#include <sys/time.h> 64#include <sys/timetc.h> 65#include <sys/kernel.h> 66#include <sys/limits.h> 67#include <sys/module.h> 68#include <sys/sysctl.h> 69#include <sys/cons.h> 70#include <sys/power.h> 71 72#include <machine/clock.h> 73#include <machine/cputypes.h> 74#include <machine/frame.h> 75#include <machine/intr_machdep.h> 76#include <machine/md_var.h> 77#include <machine/psl.h> 78#ifdef DEV_APIC 79#include <machine/apicvar.h> 80#endif 81#include <machine/specialreg.h> 82 83#include <i386/isa/icu.h> 84#include <pc98/pc98/pc98.h> 85#include <pc98/pc98/pc98_machdep.h> 86#ifdef DEV_ISA 87#include <isa/isavar.h> 88#endif 89#include <i386/isa/timerreg.h> 90 91/* 92 * 32-bit time_t's can't reach leap years before 1904 or after 2036, so we 93 * can use a simple formula for leap years. 94 */ 95#define LEAPYEAR(y) (((u_int)(y) % 4 == 0) ? 1 : 0) 96#define DAYSPERYEAR (31+28+31+30+31+30+31+31+30+31+30+31) 97 98#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x)) 99 100#ifndef BURN_BRIDGES 101/* 102 * Time in timer cycles that it takes for microtime() to disable interrupts 103 * and latch the count. microtime() currently uses "cli; outb ..." so it 104 * normally takes less than 2 timer cycles. Add a few for cache misses. 105 * Add a few more to allow for latency in bogus calls to microtime() with 106 * interrupts already disabled. 107 */ 108#define TIMER0_LATCH_COUNT 20 109 110/* 111 * Maximum frequency that we are willing to allow for timer0. Must be 112 * low enough to guarantee that the timer interrupt handler returns 113 * before the next timer interrupt. 114 */ 115#define TIMER0_MAX_FREQ 20000 116#endif 117 118int adjkerntz; /* local offset from GMT in seconds */ 119int clkintr_pending; 120int disable_rtc_set; /* disable resettodr() if != 0 */ 121int pscnt = 1; 122int psdiv = 1; 123int statclock_disable; 124#ifndef TIMER_FREQ 125#define TIMER_FREQ 2457600 126#endif 127u_int timer_freq = TIMER_FREQ; 128int timer0_max_count; 129int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */ 130struct mtx clock_lock; 131 132static int beeping = 0; 133static const u_char daysinmonth[] = {31,28,31,30,31,30,31,31,30,31,30,31}; 134static u_int hardclock_max_count; 135static u_int32_t i8254_lastcount; 136static u_int32_t i8254_offset; 137static int i8254_ticked; 138static int using_lapic_timer; 139static struct intsrc *i8254_intsrc; 140#ifndef BURN_BRIDGES 141/* 142 * XXX new_function and timer_func should not handle clockframes, but 143 * timer_func currently needs to hold hardclock to handle the 144 * timer0_state == 0 case. We should use inthand_add()/inthand_remove() 145 * to switch between clkintr() and a slightly different timerintr(). 146 */ 147static void (*new_function)(struct clockframe *frame); 148static u_int new_rate; 149static u_int timer0_prescaler_count; 150static u_char timer0_state; 151#endif 152 153/* Values for timerX_state: */ 154#define RELEASED 0 155#define RELEASE_PENDING 1 156#define ACQUIRED 2 157#define ACQUIRE_PENDING 3 158 159static u_char timer1_state; 160static u_char timer2_state; 161static void (*timer_func)(struct clockframe *frame) = hardclock; 162static void rtc_serialcombit(int); 163static void rtc_serialcom(int); 164static int rtc_inb(void); 165static void rtc_outb(int); 166 167static unsigned i8254_get_timecount(struct timecounter *tc); 168static void set_timer_freq(u_int freq, int intr_freq); 169 170static struct timecounter i8254_timecounter = { 171 i8254_get_timecount, /* get_timecount */ 172 0, /* no poll_pps */ 173 ~0u, /* counter_mask */ 174 0, /* frequency */ 175 "i8254", /* name */ 176 0 /* quality */ 177}; 178 179static void 180clkintr(struct clockframe *frame) 181{ 182 183 if (timecounter->tc_get_timecount == i8254_get_timecount) { 184 mtx_lock_spin(&clock_lock); 185 if (i8254_ticked) 186 i8254_ticked = 0; 187 else { 188 i8254_offset += timer0_max_count; 189 i8254_lastcount = 0; 190 } 191 clkintr_pending = 0; 192 mtx_unlock_spin(&clock_lock); 193 } 194 if (timer_func != hardclock || !using_lapic_timer) 195 timer_func(frame); 196#ifndef BURN_BRIDGES 197 switch (timer0_state) { 198 199 case RELEASED: 200 break; 201 202 case ACQUIRED: 203 if (using_lapic_timer) 204 break; 205 if ((timer0_prescaler_count += timer0_max_count) 206 >= hardclock_max_count) { 207 timer0_prescaler_count -= hardclock_max_count; 208 hardclock(frame); 209 } 210 break; 211 212 case ACQUIRE_PENDING: 213 mtx_lock_spin(&clock_lock); 214 i8254_offset = i8254_get_timecount(NULL); 215 i8254_lastcount = 0; 216 timer0_max_count = TIMER_DIV(new_rate); 217 outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); 218 outb(TIMER_CNTR0, timer0_max_count & 0xff); 219 outb(TIMER_CNTR0, timer0_max_count >> 8); 220 mtx_unlock_spin(&clock_lock); 221 timer_func = new_function; 222 timer0_state = ACQUIRED; 223 break; 224 225 case RELEASE_PENDING: 226 if ((timer0_prescaler_count += timer0_max_count) 227 >= hardclock_max_count) { 228 mtx_lock_spin(&clock_lock); 229 i8254_offset = i8254_get_timecount(NULL); 230 i8254_lastcount = 0; 231 timer0_max_count = hardclock_max_count; 232 outb(TIMER_MODE, 233 TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); 234 outb(TIMER_CNTR0, timer0_max_count & 0xff); 235 outb(TIMER_CNTR0, timer0_max_count >> 8); 236 mtx_unlock_spin(&clock_lock); 237 timer0_prescaler_count = 0; 238 timer_func = hardclock; 239 timer0_state = RELEASED; 240 if (!using_lapic_timer) 241 hardclock(frame); 242 } 243 break; 244 } 245#endif 246} 247 248#ifndef BURN_BRIDGES 249/* 250 * The acquire and release functions must be called at ipl >= splclock(). 251 */ 252int 253acquire_timer0(int rate, void (*function)(struct clockframe *frame)) 254{ 255 static int old_rate; 256 257 if (rate <= 0 || rate > TIMER0_MAX_FREQ) 258 return (-1); 259 switch (timer0_state) { 260 261 case RELEASED: 262 timer0_state = ACQUIRE_PENDING; 263 break; 264 265 case RELEASE_PENDING: 266 if (rate != old_rate) 267 return (-1); 268 /* 269 * The timer has been released recently, but is being 270 * re-acquired before the release completed. In this 271 * case, we simply reclaim it as if it had not been 272 * released at all. 273 */ 274 timer0_state = ACQUIRED; 275 break; 276 277 default: 278 return (-1); /* busy */ 279 } 280 new_function = function; 281 old_rate = new_rate = rate; 282 return (0); 283} 284#endif 285 286int 287acquire_timer1(int mode) 288{ 289 290 if (timer1_state != RELEASED) 291 return (-1); 292 timer1_state = ACQUIRED; 293 294 /* 295 * This access to the timer registers is as atomic as possible 296 * because it is a single instruction. We could do better if we 297 * knew the rate. Use of splclock() limits glitches to 10-100us, 298 * and this is probably good enough for timer2, so we aren't as 299 * careful with it as with timer0. 300 */ 301 outb(TIMER_MODE, TIMER_SEL1 | (mode & 0x3f)); 302 303 return (0); 304} 305 306int 307acquire_timer2(int mode) 308{ 309 310 if (timer2_state != RELEASED) 311 return (-1); 312 timer2_state = ACQUIRED; 313 314 /* 315 * This access to the timer registers is as atomic as possible 316 * because it is a single instruction. We could do better if we 317 * knew the rate. Use of splclock() limits glitches to 10-100us, 318 * and this is probably good enough for timer2, so we aren't as 319 * careful with it as with timer0. 320 */ 321 outb(TIMER_MODE, TIMER_SEL2 | (mode & 0x3f)); 322 323 return (0); 324} 325 326#ifndef BURN_BRIDGES 327int 328release_timer0() 329{ 330 switch (timer0_state) { 331 332 case ACQUIRED: 333 timer0_state = RELEASE_PENDING; 334 break; 335 336 case ACQUIRE_PENDING: 337 /* Nothing happened yet, release quickly. */ 338 timer0_state = RELEASED; 339 break; 340 341 default: 342 return (-1); 343 } 344 return (0); 345} 346#endif 347 348int 349release_timer1() 350{ 351 352 if (timer1_state != ACQUIRED) 353 return (-1); 354 timer1_state = RELEASED; 355 outb(TIMER_MODE, TIMER_SEL1 | TIMER_SQWAVE | TIMER_16BIT); 356 return (0); 357} 358 359int 360release_timer2() 361{ 362 363 if (timer2_state != ACQUIRED) 364 return (-1); 365 timer2_state = RELEASED; 366 outb(TIMER_MODE, TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT); 367 return (0); 368} 369 370 371static int 372getit(void) 373{ 374 int high, low; 375 376 mtx_lock_spin(&clock_lock); 377 378 /* Select timer0 and latch counter value. */ 379 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 380 381 low = inb(TIMER_CNTR0); 382 high = inb(TIMER_CNTR0); 383 384 mtx_unlock_spin(&clock_lock); 385 return ((high << 8) | low); 386} 387 388/* 389 * Wait "n" microseconds. 390 * Relies on timer 1 counting down from (timer_freq / hz) 391 * Note: timer had better have been programmed before this is first used! 392 */ 393void 394DELAY(int n) 395{ 396 int delta, prev_tick, tick, ticks_left; 397 398#ifdef DELAYDEBUG 399 int getit_calls = 1; 400 int n1; 401 static int state = 0; 402 403 if (state == 0) { 404 state = 1; 405 for (n1 = 1; n1 <= 10000000; n1 *= 10) 406 DELAY(n1); 407 state = 2; 408 } 409 if (state == 1) 410 printf("DELAY(%d)...", n); 411#endif 412 /* 413 * Guard against the timer being uninitialized if we are called 414 * early for console i/o. 415 */ 416 if (timer0_max_count == 0) 417 set_timer_freq(timer_freq, hz); 418 419 /* 420 * Read the counter first, so that the rest of the setup overhead is 421 * counted. Guess the initial overhead is 20 usec (on most systems it 422 * takes about 1.5 usec for each of the i/o's in getit(). The loop 423 * takes about 6 usec on a 486/33 and 13 usec on a 386/20. The 424 * multiplications and divisions to scale the count take a while). 425 * 426 * However, if ddb is active then use a fake counter since reading 427 * the i8254 counter involves acquiring a lock. ddb must not do 428 * locking for many reasons, but it calls here for at least atkbd 429 * input. 430 */ 431#ifdef KDB 432 if (kdb_active) 433 prev_tick = 1; 434 else 435#endif 436 prev_tick = getit(); 437 n -= 0; /* XXX actually guess no initial overhead */ 438 /* 439 * Calculate (n * (timer_freq / 1e6)) without using floating point 440 * and without any avoidable overflows. 441 */ 442 if (n <= 0) 443 ticks_left = 0; 444 else if (n < 256) 445 /* 446 * Use fixed point to avoid a slow division by 1000000. 447 * 39099 = 1193182 * 2^15 / 10^6 rounded to nearest. 448 * 2^15 is the first power of 2 that gives exact results 449 * for n between 0 and 256. 450 */ 451 ticks_left = ((u_int)n * 39099 + (1 << 15) - 1) >> 15; 452 else 453 /* 454 * Don't bother using fixed point, although gcc-2.7.2 455 * generates particularly poor code for the long long 456 * division, since even the slow way will complete long 457 * before the delay is up (unless we're interrupted). 458 */ 459 ticks_left = ((u_int)n * (long long)timer_freq + 999999) 460 / 1000000; 461 462 while (ticks_left > 0) { 463#ifdef KDB 464 if (kdb_active) { 465 outb(0x5f, 0); 466 tick = prev_tick - 1; 467 if (tick <= 0) 468 tick = timer0_max_count; 469 } else 470#endif 471 tick = getit(); 472#ifdef DELAYDEBUG 473 ++getit_calls; 474#endif 475 delta = prev_tick - tick; 476 prev_tick = tick; 477 if (delta < 0) { 478 delta += timer0_max_count; 479 /* 480 * Guard against timer0_max_count being wrong. 481 * This shouldn't happen in normal operation, 482 * but it may happen if set_timer_freq() is 483 * traced. 484 */ 485 if (delta < 0) 486 delta = 0; 487 } 488 ticks_left -= delta; 489 } 490#ifdef DELAYDEBUG 491 if (state == 1) 492 printf(" %d calls to getit() at %d usec each\n", 493 getit_calls, (n + 5) / getit_calls); 494#endif 495} 496 497static void 498sysbeepstop(void *chan) 499{ 500 outb(IO_PPI, inb(IO_PPI)|0x08); /* disable counter1 output to speaker */ 501 release_timer1(); 502 beeping = 0; 503} 504 505int 506sysbeep(int pitch, int period) 507{ 508 int x = splclock(); 509 510 if (acquire_timer1(TIMER_SQWAVE|TIMER_16BIT)) 511 if (!beeping) { 512 /* Something else owns it. */ 513 splx(x); 514 return (-1); /* XXX Should be EBUSY, but nobody cares anyway. */ 515 } 516 disable_intr(); 517 outb(0x3fdb, pitch); 518 outb(0x3fdb, (pitch>>8)); 519 enable_intr(); 520 if (!beeping) { 521 /* enable counter1 output to speaker */ 522 outb(IO_PPI, (inb(IO_PPI) & 0xf7)); 523 beeping = period; 524 timeout(sysbeepstop, (void *)NULL, period); 525 } 526 splx(x); 527 return (0); 528} 529 530 531unsigned int delaycount; 532#define FIRST_GUESS 0x2000 533static void findcpuspeed(void) 534{ 535 int i; 536 int remainder; 537 538 /* Put counter in count down mode */ 539 outb(TIMER_MODE, TIMER_SEL0 | TIMER_16BIT | TIMER_RATEGEN); 540 outb(TIMER_CNTR0, 0xff); 541 outb(TIMER_CNTR0, 0xff); 542 for (i = FIRST_GUESS; i; i--) 543 ; 544 remainder = getit(); 545 delaycount = (FIRST_GUESS * TIMER_DIV(1000)) / (0xffff - remainder); 546} 547 548static u_int 549calibrate_clocks(void) 550{ 551 int timeout; 552 u_int count, prev_count, tot_count; 553 u_short sec, start_sec; 554 555 if (bootverbose) 556 printf("Calibrating clock(s) ... "); 557 /* Check ARTIC. */ 558 if (!(PC98_SYSTEM_PARAMETER(0x458) & 0x80) && 559 !(PC98_SYSTEM_PARAMETER(0x45b) & 0x04)) 560 goto fail; 561 timeout = 100000000; 562 563 /* Read the ARTIC. */ 564 sec = inw(0x5e); 565 566 /* Wait for the ARTIC to changes. */ 567 start_sec = sec; 568 for (;;) { 569 sec = inw(0x5e); 570 if (sec != start_sec) 571 break; 572 if (--timeout == 0) 573 goto fail; 574 } 575 prev_count = getit(); 576 if (prev_count == 0 || prev_count > timer0_max_count) 577 goto fail; 578 tot_count = 0; 579 580 start_sec = sec; 581 for (;;) { 582 sec = inw(0x5e); 583 count = getit(); 584 if (count == 0 || count > timer0_max_count) 585 goto fail; 586 if (count > prev_count) 587 tot_count += prev_count - (count - timer0_max_count); 588 else 589 tot_count += prev_count - count; 590 prev_count = count; 591 if ((sec == start_sec + 1200) || /* 1200 = 307.2KHz >> 8 */ 592 (sec < start_sec && 593 (u_int)sec + 0x10000 == (u_int)start_sec + 1200)) 594 break; 595 if (--timeout == 0) 596 goto fail; 597 } 598 599 if (bootverbose) { 600 printf("i8254 clock: %u Hz\n", tot_count); 601 } 602 return (tot_count); 603 604fail: 605 if (bootverbose) 606 printf("failed, using default i8254 clock of %u Hz\n", 607 timer_freq); 608 return (timer_freq); 609} 610 611static void 612set_timer_freq(u_int freq, int intr_freq) 613{ 614 int new_timer0_max_count; 615 616 mtx_lock_spin(&clock_lock); 617 timer_freq = freq; 618 new_timer0_max_count = hardclock_max_count = TIMER_DIV(intr_freq); 619 if (new_timer0_max_count != timer0_max_count) { 620 timer0_max_count = new_timer0_max_count; 621 outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); 622 outb(TIMER_CNTR0, timer0_max_count & 0xff); 623 outb(TIMER_CNTR0, timer0_max_count >> 8); 624 } 625 mtx_unlock_spin(&clock_lock); 626} 627 628static void 629i8254_restore(void) 630{ 631 632 mtx_lock_spin(&clock_lock); 633 outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); 634 outb(TIMER_CNTR0, timer0_max_count & 0xff); 635 outb(TIMER_CNTR0, timer0_max_count >> 8); 636 mtx_unlock_spin(&clock_lock); 637} 638 639 640/* 641 * Restore all the timers non-atomically (XXX: should be atomically). 642 * 643 * This function is called from pmtimer_resume() to restore all the timers. 644 * This should not be necessary, but there are broken laptops that do not 645 * restore all the timers on resume. 646 */ 647void 648timer_restore(void) 649{ 650 651 i8254_restore(); /* restore timer_freq and hz */ 652} 653 654/* 655 * Initialize 8254 timer 0 early so that it can be used in DELAY(). 656 * XXX initialization of other timers is unintentionally left blank. 657 */ 658void 659startrtclock() 660{ 661 u_int delta, freq; 662 663 findcpuspeed(); 664 if (pc98_machine_type & M_8M) 665 timer_freq = 1996800L; /* 1.9968 MHz */ 666 else 667 timer_freq = 2457600L; /* 2.4576 MHz */ 668 669 set_timer_freq(timer_freq, hz); 670 freq = calibrate_clocks(); 671#ifdef CLK_CALIBRATION_LOOP 672 if (bootverbose) { 673 printf( 674 "Press a key on the console to abort clock calibration\n"); 675 while (cncheckc() == -1) 676 calibrate_clocks(); 677 } 678#endif 679 680 /* 681 * Use the calibrated i8254 frequency if it seems reasonable. 682 * Otherwise use the default, and don't use the calibrated i586 683 * frequency. 684 */ 685 delta = freq > timer_freq ? freq - timer_freq : timer_freq - freq; 686 if (delta < timer_freq / 100) { 687#ifndef CLK_USE_I8254_CALIBRATION 688 if (bootverbose) 689 printf( 690"CLK_USE_I8254_CALIBRATION not specified - using default frequency\n"); 691 freq = timer_freq; 692#endif 693 timer_freq = freq; 694 } else { 695 if (bootverbose) 696 printf( 697 "%d Hz differs from default of %d Hz by more than 1%%\n", 698 freq, timer_freq); 699 } 700 701 set_timer_freq(timer_freq, hz); 702 i8254_timecounter.tc_frequency = timer_freq; 703 tc_init(&i8254_timecounter); 704 705 init_TSC(); 706} 707 708static void 709rtc_serialcombit(int i) 710{ 711 outb(IO_RTC, ((i&0x01)<<5)|0x07); 712 DELAY(1); 713 outb(IO_RTC, ((i&0x01)<<5)|0x17); 714 DELAY(1); 715 outb(IO_RTC, ((i&0x01)<<5)|0x07); 716 DELAY(1); 717} 718 719static void 720rtc_serialcom(int i) 721{ 722 rtc_serialcombit(i&0x01); 723 rtc_serialcombit((i&0x02)>>1); 724 rtc_serialcombit((i&0x04)>>2); 725 rtc_serialcombit((i&0x08)>>3); 726 outb(IO_RTC, 0x07); 727 DELAY(1); 728 outb(IO_RTC, 0x0f); 729 DELAY(1); 730 outb(IO_RTC, 0x07); 731 DELAY(1); 732} 733 734static void 735rtc_outb(int val) 736{ 737 int s; 738 int sa = 0; 739 740 for (s=0;s<8;s++) { 741 sa = ((val >> s) & 0x01) ? 0x27 : 0x07; 742 outb(IO_RTC, sa); /* set DI & CLK 0 */ 743 DELAY(1); 744 outb(IO_RTC, sa | 0x10); /* CLK 1 */ 745 DELAY(1); 746 } 747 outb(IO_RTC, sa & 0xef); /* CLK 0 */ 748} 749 750static int 751rtc_inb(void) 752{ 753 int s; 754 int sa = 0; 755 756 for (s=0;s<8;s++) { 757 sa |= ((inb(0x33) & 0x01) << s); 758 outb(IO_RTC, 0x17); /* CLK 1 */ 759 DELAY(1); 760 outb(IO_RTC, 0x07); /* CLK 0 */ 761 DELAY(2); 762 } 763 return sa; 764} 765 766/* 767 * Initialize the time of day register, based on the time base which is, e.g. 768 * from a filesystem. 769 */ 770void 771inittodr(time_t base) 772{ 773 unsigned long sec, days; 774 int year, month; 775 int y, m, s; 776 struct timespec ts; 777 int second, min, hour; 778 779 if (base) { 780 s = splclock(); 781 ts.tv_sec = base; 782 ts.tv_nsec = 0; 783 tc_setclock(&ts); 784 splx(s); 785 } 786 787 rtc_serialcom(0x03); /* Time Read */ 788 rtc_serialcom(0x01); /* Register shift command. */ 789 DELAY(20); 790 791 second = bcd2bin(rtc_inb() & 0xff); /* sec */ 792 min = bcd2bin(rtc_inb() & 0xff); /* min */ 793 hour = bcd2bin(rtc_inb() & 0xff); /* hour */ 794 days = bcd2bin(rtc_inb() & 0xff) - 1; /* date */ 795 796 month = (rtc_inb() >> 4) & 0x0f; /* month */ 797 for (m = 1; m < month; m++) 798 days += daysinmonth[m-1]; 799 year = bcd2bin(rtc_inb() & 0xff) + 1900; /* year */ 800 /* 2000 year problem */ 801 if (year < 1995) 802 year += 100; 803 if (year < 1970) 804 goto wrong_time; 805 for (y = 1970; y < year; y++) 806 days += DAYSPERYEAR + LEAPYEAR(y); 807 if ((month > 2) && LEAPYEAR(year)) 808 days ++; 809 sec = ((( days * 24 + 810 hour) * 60 + 811 min) * 60 + 812 second); 813 /* sec now contains the number of seconds, since Jan 1 1970, 814 in the local time zone */ 815 816 s = splhigh(); 817 818 sec += tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0); 819 820 y = time_second - sec; 821 if (y <= -2 || y >= 2) { 822 /* badly off, adjust it */ 823 ts.tv_sec = sec; 824 ts.tv_nsec = 0; 825 tc_setclock(&ts); 826 } 827 splx(s); 828 return; 829 830wrong_time: 831 printf("Invalid time in real time clock.\n"); 832 printf("Check and reset the date immediately!\n"); 833} 834 835/* 836 * Write system time back to RTC 837 */ 838void 839resettodr() 840{ 841 unsigned long tm; 842 int y, m, s; 843 int wd; 844 845 if (disable_rtc_set) 846 return; 847 848 s = splclock(); 849 tm = time_second; 850 splx(s); 851 852 rtc_serialcom(0x01); /* Register shift command. */ 853 854 /* Calculate local time to put in RTC */ 855 856 tm -= tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0); 857 858 rtc_outb(bin2bcd(tm%60)); tm /= 60; /* Write back Seconds */ 859 rtc_outb(bin2bcd(tm%60)); tm /= 60; /* Write back Minutes */ 860 rtc_outb(bin2bcd(tm%24)); tm /= 24; /* Write back Hours */ 861 862 /* We have now the days since 01-01-1970 in tm */ 863 wd = (tm + 4) % 7 + 1; /* Write back Weekday */ 864 for (y = 1970, m = DAYSPERYEAR + LEAPYEAR(y); 865 tm >= m; 866 y++, m = DAYSPERYEAR + LEAPYEAR(y)) 867 tm -= m; 868 869 /* Now we have the years in y and the day-of-the-year in tm */ 870 for (m = 0; ; m++) { 871 int ml; 872 873 ml = daysinmonth[m]; 874 if (m == 1 && LEAPYEAR(y)) 875 ml++; 876 if (tm < ml) 877 break; 878 tm -= ml; 879 } 880 881 m++; 882 rtc_outb(bin2bcd(tm+1)); /* Write back Day */ 883 rtc_outb((m << 4) | wd); /* Write back Month & Weekday */ 884 rtc_outb(bin2bcd(y%100)); /* Write back Year */ 885 886 rtc_serialcom(0x02); /* Time set & Counter hold command. */ 887 rtc_serialcom(0x00); /* Register hold command. */ 888} 889 890 891/* 892 * Start both clocks running. 893 */ 894void 895cpu_initclocks() 896{ 897 898#ifdef DEV_APIC 899 using_lapic_timer = lapic_setup_clock(); 900#endif 901 /* Finish initializing 8254 timer 0. */ 902 intr_add_handler("clk", 0, (driver_intr_t *)clkintr, NULL, 903 INTR_TYPE_CLK | INTR_FAST, NULL); 904 i8254_intsrc = intr_lookup_source(0); 905 906 init_TSC_tc(); 907} 908 909void 910cpu_startprofclock(void) 911{ 912} 913 914void 915cpu_stopprofclock(void) 916{ 917} 918 919static int 920sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS) 921{ 922 int error; 923 u_int freq; 924 925 /* 926 * Use `i8254' instead of `timer' in external names because `timer' 927 * is is too generic. Should use it everywhere. 928 */ 929 freq = timer_freq; 930 error = sysctl_handle_int(oidp, &freq, sizeof(freq), req); 931 if (error == 0 && req->newptr != NULL) { 932#ifndef BURN_BRIDGES 933 if (timer0_state != RELEASED) 934 return (EBUSY); /* too much trouble to handle */ 935#endif 936 set_timer_freq(freq, hz); 937 i8254_timecounter.tc_frequency = freq; 938 } 939 return (error); 940} 941 942SYSCTL_PROC(_machdep, OID_AUTO, i8254_freq, CTLTYPE_INT | CTLFLAG_RW, 943 0, sizeof(u_int), sysctl_machdep_i8254_freq, "IU", ""); 944 945static unsigned 946i8254_get_timecount(struct timecounter *tc) 947{ 948 u_int count; 949 u_int high, low; 950 u_int eflags; 951 952 eflags = read_eflags(); 953 mtx_lock_spin(&clock_lock); 954 955 /* Select timer0 and latch counter value. */ 956 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 957 958 low = inb(TIMER_CNTR0); 959 high = inb(TIMER_CNTR0); 960 count = timer0_max_count - ((high << 8) | low); 961 if (count < i8254_lastcount || 962 (!i8254_ticked && (clkintr_pending || 963 ((count < 20 || (!(eflags & PSL_I) && count < timer0_max_count / 2u)) && 964 i8254_intsrc != NULL && 965 i8254_intsrc->is_pic->pic_source_pending(i8254_intsrc))))) { 966 i8254_ticked = 1; 967 i8254_offset += timer0_max_count; 968 } 969 i8254_lastcount = count; 970 count += i8254_offset; 971 mtx_unlock_spin(&clock_lock); 972 return (count); 973} 974 975#ifdef DEV_ISA 976/* 977 * Attach to the ISA PnP descriptors for the timer and realtime clock. 978 */ 979static struct isa_pnp_id attimer_ids[] = { 980 { 0x0001d041 /* PNP0100 */, "AT timer" }, 981 { 0x000bd041 /* PNP0B00 */, "AT realtime clock" }, 982 { 0 } 983}; 984 985static int 986attimer_probe(device_t dev) 987{ 988 int result; 989 990 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, attimer_ids)) <= 0) 991 device_quiet(dev); 992 return(result); 993} 994 995static int 996attimer_attach(device_t dev) 997{ 998 return(0); 999} 1000 1001static device_method_t attimer_methods[] = { 1002 /* Device interface */ 1003 DEVMETHOD(device_probe, attimer_probe), 1004 DEVMETHOD(device_attach, attimer_attach), 1005 DEVMETHOD(device_detach, bus_generic_detach), 1006 DEVMETHOD(device_shutdown, bus_generic_shutdown), 1007 DEVMETHOD(device_suspend, bus_generic_suspend), /* XXX stop statclock? */ 1008 DEVMETHOD(device_resume, bus_generic_resume), /* XXX restart statclock? */ 1009 { 0, 0 } 1010}; 1011 1012static driver_t attimer_driver = { 1013 "attimer", 1014 attimer_methods, 1015 1, /* no softc */ 1016}; 1017 1018static devclass_t attimer_devclass; 1019 1020DRIVER_MODULE(attimer, isa, attimer_driver, attimer_devclass, 0, 0); 1021#endif /* DEV_ISA */ 1022