pcrtc.c revision 127567
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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)clock.c 7.2 (Berkeley) 5/12/91 37 * $FreeBSD: head/sys/pc98/cbus/pcrtc.c 127567 2004-03-29 12:51:46Z nyan $ 38 */ 39 40/* 41 * Routines to handle clock hardware. 42 */ 43 44/* 45 * inittodr, settodr and support routines written 46 * by Christoph Robitschko <chmr@edvz.tu-graz.ac.at> 47 * 48 * reintroduced and updated by Chris Stenton <chris@gnome.co.uk> 8/10/94 49 */ 50 51/* 52 * modified for PC98 by Kakefuda 53 */ 54 55#include "opt_clock.h" 56#include "opt_isa.h" 57#include "opt_mca.h" 58 59#include <sys/param.h> 60#include <sys/systm.h> 61#include <sys/bus.h> 62#include <sys/limits.h> 63#include <sys/lock.h> 64#include <sys/mutex.h> 65#include <sys/proc.h> 66#include <sys/time.h> 67#include <sys/timetc.h> 68#include <sys/kernel.h> 69#include <sys/sysctl.h> 70#include <sys/cons.h> 71#include <sys/power.h> 72 73#include <machine/clock.h> 74#include <machine/cputypes.h> 75#include <machine/frame.h> 76#include <machine/intr_machdep.h> 77#include <machine/md_var.h> 78#include <machine/psl.h> 79 80#if defined(SMP) 81#include <machine/smp.h> 82#endif 83#include <machine/specialreg.h> 84 85#include <i386/isa/icu.h> 86#include <pc98/pc98/pc98.h> 87#include <pc98/pc98/pc98_machdep.h> 88#ifdef DEV_ISA 89#include <isa/isavar.h> 90#endif 91#include <i386/isa/timerreg.h> 92 93/* 94 * 32-bit time_t's can't reach leap years before 1904 or after 2036, so we 95 * can use a simple formula for leap years. 96 */ 97#define LEAPYEAR(y) (((u_int)(y) % 4 == 0) ? 1 : 0) 98#define DAYSPERYEAR (31+28+31+30+31+30+31+31+30+31+30+31) 99 100#define TIMER_DIV(x) ((timer_freq + (x) / 2) / (x)) 101 102#ifndef BURN_BRIDGES 103/* 104 * Time in timer cycles that it takes for microtime() to disable interrupts 105 * and latch the count. microtime() currently uses "cli; outb ..." so it 106 * normally takes less than 2 timer cycles. Add a few for cache misses. 107 * Add a few more to allow for latency in bogus calls to microtime() with 108 * interrupts already disabled. 109 */ 110#define TIMER0_LATCH_COUNT 20 111 112/* 113 * Maximum frequency that we are willing to allow for timer0. Must be 114 * low enough to guarantee that the timer interrupt handler returns 115 * before the next timer interrupt. 116 */ 117#define TIMER0_MAX_FREQ 20000 118#endif 119 120int adjkerntz; /* local offset from GMT in seconds */ 121int clkintr_pending; 122int disable_rtc_set; /* disable resettodr() if != 0 */ 123int pscnt = 1; 124int psdiv = 1; 125int statclock_disable; 126#ifndef TIMER_FREQ 127#define TIMER_FREQ 2457600 128#endif 129u_int timer_freq = TIMER_FREQ; 130int timer0_max_count; 131int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */ 132struct mtx clock_lock; 133 134static int beeping = 0; 135static const u_char daysinmonth[] = {31,28,31,30,31,30,31,31,30,31,30,31}; 136static u_int hardclock_max_count; 137static u_int32_t i8254_lastcount; 138static u_int32_t i8254_offset; 139static int i8254_ticked; 140static struct intsrc *i8254_intsrc; 141#ifndef BURN_BRIDGES 142/* 143 * XXX new_function and timer_func should not handle clockframes, but 144 * timer_func currently needs to hold hardclock to handle the 145 * timer0_state == 0 case. We should use inthand_add()/inthand_remove() 146 * to switch between clkintr() and a slightly different timerintr(). 147 */ 148static void (*new_function)(struct clockframe *frame); 149static u_int new_rate; 150static u_int timer0_prescaler_count; 151static u_char timer0_state; 152#endif 153 154/* Values for timerX_state: */ 155#define RELEASED 0 156#define RELEASE_PENDING 1 157#define ACQUIRED 2 158#define ACQUIRE_PENDING 3 159 160static u_char timer1_state; 161static u_char timer2_state; 162static void (*timer_func)(struct clockframe *frame) = hardclock; 163static void rtc_serialcombit(int); 164static void rtc_serialcom(int); 165static int rtc_inb(void); 166static void rtc_outb(int); 167 168static unsigned i8254_get_timecount(struct timecounter *tc); 169static void set_timer_freq(u_int freq, int intr_freq); 170 171static struct timecounter i8254_timecounter = { 172 i8254_get_timecount, /* get_timecount */ 173 0, /* no poll_pps */ 174 ~0u, /* counter_mask */ 175 0, /* frequency */ 176 "i8254", /* name */ 177 0 /* quality */ 178}; 179 180static void 181clkintr(struct clockframe *frame) 182{ 183 184 if (timecounter->tc_get_timecount == i8254_get_timecount) { 185 mtx_lock_spin(&clock_lock); 186 if (i8254_ticked) 187 i8254_ticked = 0; 188 else { 189 i8254_offset += timer0_max_count; 190 i8254_lastcount = 0; 191 } 192 clkintr_pending = 0; 193 mtx_unlock_spin(&clock_lock); 194 } 195 timer_func(frame); 196#ifdef SMP 197 if (timer_func == hardclock) 198 forward_hardclock(); 199#endif 200#ifndef BURN_BRIDGES 201 switch (timer0_state) { 202 203 case RELEASED: 204 break; 205 206 case ACQUIRED: 207 if ((timer0_prescaler_count += timer0_max_count) 208 >= hardclock_max_count) { 209 timer0_prescaler_count -= hardclock_max_count; 210 hardclock(frame); 211#ifdef SMP 212 forward_hardclock(); 213#endif 214 } 215 break; 216 217 case ACQUIRE_PENDING: 218 mtx_lock_spin(&clock_lock); 219 i8254_offset = i8254_get_timecount(NULL); 220 i8254_lastcount = 0; 221 timer0_max_count = TIMER_DIV(new_rate); 222 outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); 223 outb(TIMER_CNTR0, timer0_max_count & 0xff); 224 outb(TIMER_CNTR0, timer0_max_count >> 8); 225 mtx_unlock_spin(&clock_lock); 226 timer_func = new_function; 227 timer0_state = ACQUIRED; 228 break; 229 230 case RELEASE_PENDING: 231 if ((timer0_prescaler_count += timer0_max_count) 232 >= hardclock_max_count) { 233 mtx_lock_spin(&clock_lock); 234 i8254_offset = i8254_get_timecount(NULL); 235 i8254_lastcount = 0; 236 timer0_max_count = hardclock_max_count; 237 outb(TIMER_MODE, 238 TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); 239 outb(TIMER_CNTR0, timer0_max_count & 0xff); 240 outb(TIMER_CNTR0, timer0_max_count >> 8); 241 mtx_unlock_spin(&clock_lock); 242 timer0_prescaler_count = 0; 243 timer_func = hardclock; 244 timer0_state = RELEASED; 245 hardclock(frame); 246#ifdef SMP 247 forward_hardclock(); 248#endif 249 } 250 break; 251 } 252#endif 253} 254 255#ifndef BURN_BRIDGES 256/* 257 * The acquire and release functions must be called at ipl >= splclock(). 258 */ 259int 260acquire_timer0(int rate, void (*function)(struct clockframe *frame)) 261{ 262 static int old_rate; 263 264 if (rate <= 0 || rate > TIMER0_MAX_FREQ) 265 return (-1); 266 switch (timer0_state) { 267 268 case RELEASED: 269 timer0_state = ACQUIRE_PENDING; 270 break; 271 272 case RELEASE_PENDING: 273 if (rate != old_rate) 274 return (-1); 275 /* 276 * The timer has been released recently, but is being 277 * re-acquired before the release completed. In this 278 * case, we simply reclaim it as if it had not been 279 * released at all. 280 */ 281 timer0_state = ACQUIRED; 282 break; 283 284 default: 285 return (-1); /* busy */ 286 } 287 new_function = function; 288 old_rate = new_rate = rate; 289 return (0); 290} 291#endif 292 293int 294acquire_timer1(int mode) 295{ 296 297 if (timer1_state != RELEASED) 298 return (-1); 299 timer1_state = ACQUIRED; 300 301 /* 302 * This access to the timer registers is as atomic as possible 303 * because it is a single instruction. We could do better if we 304 * knew the rate. Use of splclock() limits glitches to 10-100us, 305 * and this is probably good enough for timer2, so we aren't as 306 * careful with it as with timer0. 307 */ 308 outb(TIMER_MODE, TIMER_SEL1 | (mode & 0x3f)); 309 310 return (0); 311} 312 313int 314acquire_timer2(int mode) 315{ 316 317 if (timer2_state != RELEASED) 318 return (-1); 319 timer2_state = ACQUIRED; 320 321 /* 322 * This access to the timer registers is as atomic as possible 323 * because it is a single instruction. We could do better if we 324 * knew the rate. Use of splclock() limits glitches to 10-100us, 325 * and this is probably good enough for timer2, so we aren't as 326 * careful with it as with timer0. 327 */ 328 outb(TIMER_MODE, TIMER_SEL2 | (mode & 0x3f)); 329 330 return (0); 331} 332 333#ifndef BURN_BRIDGES 334int 335release_timer0() 336{ 337 switch (timer0_state) { 338 339 case ACQUIRED: 340 timer0_state = RELEASE_PENDING; 341 break; 342 343 case ACQUIRE_PENDING: 344 /* Nothing happened yet, release quickly. */ 345 timer0_state = RELEASED; 346 break; 347 348 default: 349 return (-1); 350 } 351 return (0); 352} 353#endif 354 355int 356release_timer1() 357{ 358 359 if (timer1_state != ACQUIRED) 360 return (-1); 361 timer1_state = RELEASED; 362 outb(TIMER_MODE, TIMER_SEL1 | TIMER_SQWAVE | TIMER_16BIT); 363 return (0); 364} 365 366int 367release_timer2() 368{ 369 370 if (timer2_state != ACQUIRED) 371 return (-1); 372 timer2_state = RELEASED; 373 outb(TIMER_MODE, TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT); 374 return (0); 375} 376 377 378static int 379getit(void) 380{ 381 int high, low; 382 383 mtx_lock_spin(&clock_lock); 384 385 /* Select timer0 and latch counter value. */ 386 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 387 388 low = inb(TIMER_CNTR0); 389 high = inb(TIMER_CNTR0); 390 391 mtx_unlock_spin(&clock_lock); 392 return ((high << 8) | low); 393} 394 395/* 396 * Wait "n" microseconds. 397 * Relies on timer 1 counting down from (timer_freq / hz) 398 * Note: timer had better have been programmed before this is first used! 399 */ 400void 401DELAY(int n) 402{ 403 int delta, prev_tick, tick, ticks_left; 404 405#ifdef DELAYDEBUG 406 int getit_calls = 1; 407 int n1; 408 static int state = 0; 409 410 if (state == 0) { 411 state = 1; 412 for (n1 = 1; n1 <= 10000000; n1 *= 10) 413 DELAY(n1); 414 state = 2; 415 } 416 if (state == 1) 417 printf("DELAY(%d)...", n); 418#endif 419 /* 420 * Guard against the timer being uninitialized if we are called 421 * early for console i/o. 422 */ 423 if (timer0_max_count == 0) 424 set_timer_freq(timer_freq, hz); 425 426 /* 427 * Read the counter first, so that the rest of the setup overhead is 428 * counted. Guess the initial overhead is 20 usec (on most systems it 429 * takes about 1.5 usec for each of the i/o's in getit(). The loop 430 * takes about 6 usec on a 486/33 and 13 usec on a 386/20. The 431 * multiplications and divisions to scale the count take a while). 432 * 433 * However, if ddb is active then use a fake counter since reading 434 * the i8254 counter involves acquiring a lock. ddb must not go 435 * locking for many reasons, but it calls here for at least atkbd 436 * input. 437 */ 438#ifdef DDB 439 if (db_active) 440 prev_tick = 0; 441 else 442#endif 443 prev_tick = getit(); 444 n -= 0; /* XXX actually guess no initial overhead */ 445 /* 446 * Calculate (n * (timer_freq / 1e6)) without using floating point 447 * and without any avoidable overflows. 448 */ 449 if (n <= 0) 450 ticks_left = 0; 451 else if (n < 256) 452 /* 453 * Use fixed point to avoid a slow division by 1000000. 454 * 39099 = 1193182 * 2^15 / 10^6 rounded to nearest. 455 * 2^15 is the first power of 2 that gives exact results 456 * for n between 0 and 256. 457 */ 458 ticks_left = ((u_int)n * 39099 + (1 << 15) - 1) >> 15; 459 else 460 /* 461 * Don't bother using fixed point, although gcc-2.7.2 462 * generates particularly poor code for the long long 463 * division, since even the slow way will complete long 464 * before the delay is up (unless we're interrupted). 465 */ 466 ticks_left = ((u_int)n * (long long)timer_freq + 999999) 467 / 1000000; 468 469 while (ticks_left > 0) { 470#ifdef DDB 471 if (db_active) { 472 outb(0x5f, 0); 473 tick = prev_tick + 1; 474 } else 475#endif 476 tick = getit(); 477#ifdef DELAYDEBUG 478 ++getit_calls; 479#endif 480 delta = prev_tick - tick; 481 prev_tick = tick; 482 if (delta < 0) { 483 delta += timer0_max_count; 484 /* 485 * Guard against timer0_max_count being wrong. 486 * This shouldn't happen in normal operation, 487 * but it may happen if set_timer_freq() is 488 * traced. 489 */ 490 if (delta < 0) 491 delta = 0; 492 } 493 ticks_left -= delta; 494 } 495#ifdef DELAYDEBUG 496 if (state == 1) 497 printf(" %d calls to getit() at %d usec each\n", 498 getit_calls, (n + 5) / getit_calls); 499#endif 500} 501 502static void 503sysbeepstop(void *chan) 504{ 505 outb(IO_PPI, inb(IO_PPI)|0x08); /* disable counter1 output to speaker */ 506 release_timer1(); 507 beeping = 0; 508} 509 510int 511sysbeep(int pitch, int period) 512{ 513 int x = splclock(); 514 515 if (acquire_timer1(TIMER_SQWAVE|TIMER_16BIT)) 516 if (!beeping) { 517 /* Something else owns it. */ 518 splx(x); 519 return (-1); /* XXX Should be EBUSY, but nobody cares anyway. */ 520 } 521 disable_intr(); 522 outb(0x3fdb, pitch); 523 outb(0x3fdb, (pitch>>8)); 524 enable_intr(); 525 if (!beeping) { 526 /* enable counter1 output to speaker */ 527 outb(IO_PPI, (inb(IO_PPI) & 0xf7)); 528 beeping = period; 529 timeout(sysbeepstop, (void *)NULL, period); 530 } 531 splx(x); 532 return (0); 533} 534 535 536unsigned int delaycount; 537#define FIRST_GUESS 0x2000 538static void findcpuspeed(void) 539{ 540 int i; 541 int remainder; 542 543 /* Put counter in count down mode */ 544 outb(TIMER_MODE, TIMER_SEL0 | TIMER_16BIT | TIMER_RATEGEN); 545 outb(TIMER_CNTR0, 0xff); 546 outb(TIMER_CNTR0, 0xff); 547 for (i = FIRST_GUESS; i; i--) 548 ; 549 remainder = getit(); 550 delaycount = (FIRST_GUESS * TIMER_DIV(1000)) / (0xffff - remainder); 551} 552 553static u_int 554calibrate_clocks(void) 555{ 556 int timeout; 557 u_int count, prev_count, tot_count; 558 u_short sec, start_sec; 559 560 if (bootverbose) 561 printf("Calibrating clock(s) ... "); 562 /* Check ARTIC. */ 563 if (!(PC98_SYSTEM_PARAMETER(0x458) & 0x80) && 564 !(PC98_SYSTEM_PARAMETER(0x45b) & 0x04)) 565 goto fail; 566 timeout = 100000000; 567 568 /* Read the ARTIC. */ 569 sec = inw(0x5e); 570 571 /* Wait for the ARTIC to changes. */ 572 start_sec = sec; 573 for (;;) { 574 sec = inw(0x5e); 575 if (sec != start_sec) 576 break; 577 if (--timeout == 0) 578 goto fail; 579 } 580 prev_count = getit(); 581 if (prev_count == 0 || prev_count > timer0_max_count) 582 goto fail; 583 tot_count = 0; 584 585 start_sec = sec; 586 for (;;) { 587 sec = inw(0x5e); 588 count = getit(); 589 if (count == 0 || count > timer0_max_count) 590 goto fail; 591 if (count > prev_count) 592 tot_count += prev_count - (count - timer0_max_count); 593 else 594 tot_count += prev_count - count; 595 prev_count = count; 596 if ((sec == start_sec + 1200) || /* 1200 = 307.2KHz >> 8 */ 597 (sec < start_sec && 598 (u_int)sec + 0x10000 == (u_int)start_sec + 1200)) 599 break; 600 if (--timeout == 0) 601 goto fail; 602 } 603 604 if (bootverbose) { 605 printf("i8254 clock: %u Hz\n", tot_count); 606 } 607 return (tot_count); 608 609fail: 610 if (bootverbose) 611 printf("failed, using default i8254 clock of %u Hz\n", 612 timer_freq); 613 return (timer_freq); 614} 615 616static void 617set_timer_freq(u_int freq, int intr_freq) 618{ 619 int new_timer0_max_count; 620 621 mtx_lock_spin(&clock_lock); 622 timer_freq = freq; 623 new_timer0_max_count = hardclock_max_count = TIMER_DIV(intr_freq); 624 if (new_timer0_max_count != timer0_max_count) { 625 timer0_max_count = new_timer0_max_count; 626 outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); 627 outb(TIMER_CNTR0, timer0_max_count & 0xff); 628 outb(TIMER_CNTR0, timer0_max_count >> 8); 629 } 630 mtx_unlock_spin(&clock_lock); 631} 632 633static void 634i8254_restore(void) 635{ 636 637 mtx_lock_spin(&clock_lock); 638 outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT); 639 outb(TIMER_CNTR0, timer0_max_count & 0xff); 640 outb(TIMER_CNTR0, timer0_max_count >> 8); 641 mtx_unlock_spin(&clock_lock); 642} 643 644 645/* 646 * Restore all the timers non-atomically (XXX: should be atomically). 647 * 648 * This function is called from pmtimer_resume() to restore all the timers. 649 * This should not be necessary, but there are broken laptops that do not 650 * restore all the timers on resume. 651 */ 652void 653timer_restore(void) 654{ 655 656 i8254_restore(); /* restore timer_freq and hz */ 657} 658 659/* 660 * Initialize 8254 timer 0 early so that it can be used in DELAY(). 661 * XXX initialization of other timers is unintentionally left blank. 662 */ 663void 664startrtclock() 665{ 666 u_int delta, freq; 667 668 findcpuspeed(); 669 if (pc98_machine_type & M_8M) 670 timer_freq = 1996800L; /* 1.9968 MHz */ 671 else 672 timer_freq = 2457600L; /* 2.4576 MHz */ 673 674 set_timer_freq(timer_freq, hz); 675 freq = calibrate_clocks(); 676#ifdef CLK_CALIBRATION_LOOP 677 if (bootverbose) { 678 printf( 679 "Press a key on the console to abort clock calibration\n"); 680 while (cncheckc() == -1) 681 calibrate_clocks(); 682 } 683#endif 684 685 /* 686 * Use the calibrated i8254 frequency if it seems reasonable. 687 * Otherwise use the default, and don't use the calibrated i586 688 * frequency. 689 */ 690 delta = freq > timer_freq ? freq - timer_freq : timer_freq - freq; 691 if (delta < timer_freq / 100) { 692#ifndef CLK_USE_I8254_CALIBRATION 693 if (bootverbose) 694 printf( 695"CLK_USE_I8254_CALIBRATION not specified - using default frequency\n"); 696 freq = timer_freq; 697#endif 698 timer_freq = freq; 699 } else { 700 if (bootverbose) 701 printf( 702 "%d Hz differs from default of %d Hz by more than 1%%\n", 703 freq, timer_freq); 704 } 705 706 set_timer_freq(timer_freq, hz); 707 i8254_timecounter.tc_frequency = timer_freq; 708 tc_init(&i8254_timecounter); 709 710 init_TSC(); 711} 712 713static void 714rtc_serialcombit(int i) 715{ 716 outb(IO_RTC, ((i&0x01)<<5)|0x07); 717 DELAY(1); 718 outb(IO_RTC, ((i&0x01)<<5)|0x17); 719 DELAY(1); 720 outb(IO_RTC, ((i&0x01)<<5)|0x07); 721 DELAY(1); 722} 723 724static void 725rtc_serialcom(int i) 726{ 727 rtc_serialcombit(i&0x01); 728 rtc_serialcombit((i&0x02)>>1); 729 rtc_serialcombit((i&0x04)>>2); 730 rtc_serialcombit((i&0x08)>>3); 731 outb(IO_RTC, 0x07); 732 DELAY(1); 733 outb(IO_RTC, 0x0f); 734 DELAY(1); 735 outb(IO_RTC, 0x07); 736 DELAY(1); 737} 738 739static void 740rtc_outb(int val) 741{ 742 int s; 743 int sa = 0; 744 745 for (s=0;s<8;s++) { 746 sa = ((val >> s) & 0x01) ? 0x27 : 0x07; 747 outb(IO_RTC, sa); /* set DI & CLK 0 */ 748 DELAY(1); 749 outb(IO_RTC, sa | 0x10); /* CLK 1 */ 750 DELAY(1); 751 } 752 outb(IO_RTC, sa & 0xef); /* CLK 0 */ 753} 754 755static int 756rtc_inb(void) 757{ 758 int s; 759 int sa = 0; 760 761 for (s=0;s<8;s++) { 762 sa |= ((inb(0x33) & 0x01) << s); 763 outb(IO_RTC, 0x17); /* CLK 1 */ 764 DELAY(1); 765 outb(IO_RTC, 0x07); /* CLK 0 */ 766 DELAY(2); 767 } 768 return sa; 769} 770 771/* 772 * Initialize the time of day register, based on the time base which is, e.g. 773 * from a filesystem. 774 */ 775void 776inittodr(time_t base) 777{ 778 unsigned long sec, days; 779 int year, month; 780 int y, m, s; 781 struct timespec ts; 782 int second, min, hour; 783 784 if (base) { 785 s = splclock(); 786 ts.tv_sec = base; 787 ts.tv_nsec = 0; 788 tc_setclock(&ts); 789 splx(s); 790 } 791 792 rtc_serialcom(0x03); /* Time Read */ 793 rtc_serialcom(0x01); /* Register shift command. */ 794 DELAY(20); 795 796 second = bcd2bin(rtc_inb() & 0xff); /* sec */ 797 min = bcd2bin(rtc_inb() & 0xff); /* min */ 798 hour = bcd2bin(rtc_inb() & 0xff); /* hour */ 799 days = bcd2bin(rtc_inb() & 0xff) - 1; /* date */ 800 801 month = (rtc_inb() >> 4) & 0x0f; /* month */ 802 for (m = 1; m < month; m++) 803 days += daysinmonth[m-1]; 804 year = bcd2bin(rtc_inb() & 0xff) + 1900; /* year */ 805 /* 2000 year problem */ 806 if (year < 1995) 807 year += 100; 808 if (year < 1970) 809 goto wrong_time; 810 for (y = 1970; y < year; y++) 811 days += DAYSPERYEAR + LEAPYEAR(y); 812 if ((month > 2) && LEAPYEAR(year)) 813 days ++; 814 sec = ((( days * 24 + 815 hour) * 60 + 816 min) * 60 + 817 second); 818 /* sec now contains the number of seconds, since Jan 1 1970, 819 in the local time zone */ 820 821 s = splhigh(); 822 823 sec += tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0); 824 825 y = time_second - sec; 826 if (y <= -2 || y >= 2) { 827 /* badly off, adjust it */ 828 ts.tv_sec = sec; 829 ts.tv_nsec = 0; 830 tc_setclock(&ts); 831 } 832 splx(s); 833 return; 834 835wrong_time: 836 printf("Invalid time in real time clock.\n"); 837 printf("Check and reset the date immediately!\n"); 838} 839 840/* 841 * Write system time back to RTC 842 */ 843void 844resettodr() 845{ 846 unsigned long tm; 847 int y, m, s; 848 int wd; 849 850 if (disable_rtc_set) 851 return; 852 853 s = splclock(); 854 tm = time_second; 855 splx(s); 856 857 rtc_serialcom(0x01); /* Register shift command. */ 858 859 /* Calculate local time to put in RTC */ 860 861 tm -= tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0); 862 863 rtc_outb(bin2bcd(tm%60)); tm /= 60; /* Write back Seconds */ 864 rtc_outb(bin2bcd(tm%60)); tm /= 60; /* Write back Minutes */ 865 rtc_outb(bin2bcd(tm%24)); tm /= 24; /* Write back Hours */ 866 867 /* We have now the days since 01-01-1970 in tm */ 868 wd = (tm + 4) % 7 + 1; /* Write back Weekday */ 869 for (y = 1970, m = DAYSPERYEAR + LEAPYEAR(y); 870 tm >= m; 871 y++, m = DAYSPERYEAR + LEAPYEAR(y)) 872 tm -= m; 873 874 /* Now we have the years in y and the day-of-the-year in tm */ 875 for (m = 0; ; m++) { 876 int ml; 877 878 ml = daysinmonth[m]; 879 if (m == 1 && LEAPYEAR(y)) 880 ml++; 881 if (tm < ml) 882 break; 883 tm -= ml; 884 } 885 886 m++; 887 rtc_outb(bin2bcd(tm+1)); /* Write back Day */ 888 rtc_outb((m << 4) | wd); /* Write back Month & Weekday */ 889 rtc_outb(bin2bcd(y%100)); /* Write back Year */ 890 891 rtc_serialcom(0x02); /* Time set & Counter hold command. */ 892 rtc_serialcom(0x00); /* Register hold command. */ 893} 894 895 896/* 897 * Start both clocks running. 898 */ 899void 900cpu_initclocks() 901{ 902 903 /* Finish initializing 8254 timer 0. */ 904 intr_add_handler("clk", 0, (driver_intr_t *)clkintr, NULL, 905 INTR_TYPE_CLK | INTR_FAST, NULL); 906 907 init_TSC_tc(); 908} 909 910void 911cpu_startprofclock(void) 912{ 913} 914 915void 916cpu_stopprofclock(void) 917{ 918} 919 920static int 921sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS) 922{ 923 int error; 924 u_int freq; 925 926 /* 927 * Use `i8254' instead of `timer' in external names because `timer' 928 * is is too generic. Should use it everywhere. 929 */ 930 freq = timer_freq; 931 error = sysctl_handle_int(oidp, &freq, sizeof(freq), req); 932 if (error == 0 && req->newptr != NULL) { 933#ifndef BURN_BRIDGES 934 if (timer0_state != RELEASED) 935 return (EBUSY); /* too much trouble to handle */ 936#endif 937 set_timer_freq(freq, hz); 938 i8254_timecounter.tc_frequency = freq; 939 } 940 return (error); 941} 942 943SYSCTL_PROC(_machdep, OID_AUTO, i8254_freq, CTLTYPE_INT | CTLFLAG_RW, 944 0, sizeof(u_int), sysctl_machdep_i8254_freq, "IU", ""); 945 946static unsigned 947i8254_get_timecount(struct timecounter *tc) 948{ 949 u_int count; 950 u_int high, low; 951 u_int eflags; 952 953 eflags = read_eflags(); 954 mtx_lock_spin(&clock_lock); 955 956 /* Select timer0 and latch counter value. */ 957 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 958 959 low = inb(TIMER_CNTR0); 960 high = inb(TIMER_CNTR0); 961 count = timer0_max_count - ((high << 8) | low); 962 if (count < i8254_lastcount || 963 (!i8254_ticked && (clkintr_pending || 964 ((count < 20 || (!(eflags & PSL_I) && count < timer0_max_count / 2u)) && 965 i8254_intsrc != NULL && 966 i8254_intsrc->is_pic->pic_source_pending(i8254_intsrc))))) { 967 i8254_ticked = 1; 968 i8254_offset += timer0_max_count; 969 } 970 i8254_lastcount = count; 971 count += i8254_offset; 972 mtx_unlock_spin(&clock_lock); 973 return (count); 974} 975 976#ifdef DEV_ISA 977/* 978 * Attach to the ISA PnP descriptors for the timer and realtime clock. 979 */ 980static struct isa_pnp_id attimer_ids[] = { 981 { 0x0001d041 /* PNP0100 */, "AT timer" }, 982 { 0x000bd041 /* PNP0B00 */, "AT realtime clock" }, 983 { 0 } 984}; 985 986static int 987attimer_probe(device_t dev) 988{ 989 int result; 990 991 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, attimer_ids)) <= 0) 992 device_quiet(dev); 993 return(result); 994} 995 996static int 997attimer_attach(device_t dev) 998{ 999 return(0); 1000} 1001 1002static device_method_t attimer_methods[] = { 1003 /* Device interface */ 1004 DEVMETHOD(device_probe, attimer_probe), 1005 DEVMETHOD(device_attach, attimer_attach), 1006 DEVMETHOD(device_detach, bus_generic_detach), 1007 DEVMETHOD(device_shutdown, bus_generic_shutdown), 1008 DEVMETHOD(device_suspend, bus_generic_suspend), /* XXX stop statclock? */ 1009 DEVMETHOD(device_resume, bus_generic_resume), /* XXX restart statclock? */ 1010 { 0, 0 } 1011}; 1012 1013static driver_t attimer_driver = { 1014 "attimer", 1015 attimer_methods, 1016 1, /* no softc */ 1017}; 1018 1019static devclass_t attimer_devclass; 1020 1021DRIVER_MODULE(attimer, isa, attimer_driver, attimer_devclass, 0, 0); 1022#endif /* DEV_ISA */ 1023