clock.c revision 1.28.4.2
1 /* $NetBSD: clock.c,v 1.28.4.2 2009/05/04 08:12:10 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz and Don Ahn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)clock.c 7.2 (Berkeley) 5/12/91 35 */ 36 /*- 37 * Copyright (c) 1993, 1994 Charles M. Hannum. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * William Jolitz and Don Ahn. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)clock.c 7.2 (Berkeley) 5/12/91 71 */ 72 /* 73 * Mach Operating System 74 * Copyright (c) 1991,1990,1989 Carnegie Mellon University 75 * All Rights Reserved. 76 * 77 * Permission to use, copy, modify and distribute this software and its 78 * documentation is hereby granted, provided that both the copyright 79 * notice and this permission notice appear in all copies of the 80 * software, derivative works or modified versions, and any portions 81 * thereof, and that both notices appear in supporting documentation. 82 * 83 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 84 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 85 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 86 * 87 * Carnegie Mellon requests users of this software to return to 88 * 89 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 90 * School of Computer Science 91 * Carnegie Mellon University 92 * Pittsburgh PA 15213-3890 93 * 94 * any improvements or extensions that they make and grant Carnegie Mellon 95 * the rights to redistribute these changes. 96 */ 97 /* 98 Copyright 1988, 1989 by Intel Corporation, Santa Clara, California. 99 100 All Rights Reserved 101 102 Permission to use, copy, modify, and distribute this software and 103 its documentation for any purpose and without fee is hereby 104 granted, provided that the above copyright notice appears in all 105 copies and that both the copyright notice and this permission notice 106 appear in supporting documentation, and that the name of Intel 107 not be used in advertising or publicity pertaining to distribution 108 of the software without specific, written prior permission. 109 110 INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 111 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, 112 IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 113 CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 114 LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 115 NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 116 WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 117 */ 118 119 /* 120 * Primitive clock interrupt routines. 121 */ 122 123 #include <sys/cdefs.h> 124 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.28.4.2 2009/05/04 08:12:10 yamt Exp $"); 125 126 /* #define CLOCKDEBUG */ 127 /* #define CLOCK_PARANOIA */ 128 129 #include "opt_multiprocessor.h" 130 #include "opt_ntp.h" 131 132 #include <sys/param.h> 133 #include <sys/systm.h> 134 #include <sys/time.h> 135 #include <sys/timetc.h> 136 #include <sys/kernel.h> 137 #include <sys/device.h> 138 #include <sys/mutex.h> 139 #include <sys/cpu.h> 140 #include <sys/intr.h> 141 142 #include <machine/pio.h> 143 #include <machine/cpufunc.h> 144 #include <machine/lock.h> 145 146 #include <dev/isa/isareg.h> 147 #include <dev/isa/isavar.h> 148 #include <dev/ic/mc146818reg.h> 149 #include <dev/ic/i8253reg.h> 150 #include <i386/isa/nvram.h> 151 #include <x86/x86/tsc.h> 152 #include <x86/lock.h> 153 #include <dev/clock_subr.h> 154 #include <machine/specialreg.h> 155 156 #ifndef __x86_64__ 157 #include "mca.h" 158 #endif 159 #if NMCA > 0 160 #include <machine/mca_machdep.h> /* for MCA_system */ 161 #endif 162 163 #include "pcppi.h" 164 #if (NPCPPI > 0) 165 #include <dev/isa/pcppivar.h> 166 167 int sysbeepmatch(device_t, cfdata_t, void *); 168 void sysbeepattach(device_t, device_t, void *); 169 int sysbeepdetach(device_t, int); 170 171 CFATTACH_DECL3_NEW(sysbeep, 0, 172 sysbeepmatch, sysbeepattach, sysbeepdetach, NULL, NULL, NULL, 173 DVF_DETACH_SHUTDOWN); 174 175 static int ppi_attached; 176 static pcppi_tag_t ppicookie; 177 #endif /* PCPPI */ 178 179 #ifdef CLOCKDEBUG 180 int clock_debug = 0; 181 #define DPRINTF(arg) if (clock_debug) printf arg 182 #else 183 #define DPRINTF(arg) 184 #endif 185 186 /* Used by lapic.c */ 187 unsigned int gettick(void); 188 void sysbeep(int, int); 189 static void tickle_tc(void); 190 191 static int clockintr(void *, struct intrframe *); 192 static void rtcinit(void); 193 static int rtcget(mc_todregs *); 194 static void rtcput(mc_todregs *); 195 196 static int cmoscheck(void); 197 198 static int clock_expandyear(int); 199 int sysbeepdetach(device_t, int); 200 201 static unsigned int gettick_broken_latch(void); 202 203 static volatile uint32_t i8254_lastcount; 204 static volatile uint32_t i8254_offset; 205 static volatile int i8254_ticked; 206 207 /* to protect TC timer variables */ 208 static __cpu_simple_lock_t tmr_lock = __SIMPLELOCK_UNLOCKED; 209 210 inline u_int mc146818_read(void *, u_int); 211 inline void mc146818_write(void *, u_int, u_int); 212 213 u_int i8254_get_timecount(struct timecounter *); 214 static void rtc_register(void); 215 216 static struct timecounter i8254_timecounter = { 217 i8254_get_timecount, /* get_timecount */ 218 0, /* no poll_pps */ 219 ~0u, /* counter_mask */ 220 TIMER_FREQ, /* frequency */ 221 "i8254", /* name */ 222 100, /* quality */ 223 NULL, /* private data */ 224 NULL, /* next */ 225 }; 226 227 /* XXX use sc? */ 228 inline u_int 229 mc146818_read(void *sc, u_int reg) 230 { 231 232 outb(IO_RTC, reg); 233 return (inb(IO_RTC+1)); 234 } 235 236 /* XXX use sc? */ 237 inline void 238 mc146818_write(void *sc, u_int reg, u_int datum) 239 { 240 241 outb(IO_RTC, reg); 242 outb(IO_RTC+1, datum); 243 } 244 245 u_long rtclock_tval; /* i8254 reload value for countdown */ 246 int rtclock_init = 0; 247 248 int clock_broken_latch = 0; 249 250 #ifdef CLOCK_PARANOIA 251 static int ticks[6]; 252 #endif 253 /* 254 * i8254 latch check routine: 255 * National Geode (formerly Cyrix MediaGX) has a serious bug in 256 * its built-in i8254-compatible clock module. 257 * machdep sets the variable 'clock_broken_latch' to indicate it. 258 */ 259 260 static unsigned int 261 gettick_broken_latch(void) 262 { 263 int v1, v2, v3; 264 int w1, w2, w3; 265 int s; 266 267 /* Don't want someone screwing with the counter while we're here. */ 268 s = splhigh(); 269 __cpu_simple_lock(&tmr_lock); 270 v1 = inb(IO_TIMER1+TIMER_CNTR0); 271 v1 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 272 v2 = inb(IO_TIMER1+TIMER_CNTR0); 273 v2 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 274 v3 = inb(IO_TIMER1+TIMER_CNTR0); 275 v3 |= inb(IO_TIMER1+TIMER_CNTR0) << 8; 276 __cpu_simple_unlock(&tmr_lock); 277 splx(s); 278 279 #ifdef CLOCK_PARANOIA 280 if (clock_debug) { 281 ticks[0] = ticks[3]; 282 ticks[1] = ticks[4]; 283 ticks[2] = ticks[5]; 284 ticks[3] = v1; 285 ticks[4] = v2; 286 ticks[5] = v3; 287 } 288 #endif 289 290 if (v1 >= v2 && v2 >= v3 && v1 - v3 < 0x200) 291 return (v2); 292 293 #define _swap_val(a, b) do { \ 294 int c = a; \ 295 a = b; \ 296 b = c; \ 297 } while (0) 298 299 /* 300 * sort v1 v2 v3 301 */ 302 if (v1 < v2) 303 _swap_val(v1, v2); 304 if (v2 < v3) 305 _swap_val(v2, v3); 306 if (v1 < v2) 307 _swap_val(v1, v2); 308 309 /* 310 * compute the middle value 311 */ 312 313 if (v1 - v3 < 0x200) 314 return (v2); 315 316 w1 = v2 - v3; 317 w2 = v3 - v1 + rtclock_tval; 318 w3 = v1 - v2; 319 if (w1 >= w2) { 320 if (w1 >= w3) 321 return (v1); 322 } else { 323 if (w2 >= w3) 324 return (v2); 325 } 326 return (v3); 327 } 328 329 /* minimal initialization, enough for delay() */ 330 void 331 initrtclock(u_long freq) 332 { 333 u_long tval; 334 335 /* 336 * Compute timer_count, the count-down count the timer will be 337 * set to. Also, correctly round 338 * this by carrying an extra bit through the division. 339 */ 340 tval = (freq * 2) / (u_long) hz; 341 tval = (tval / 2) + (tval & 0x1); 342 343 /* initialize 8254 clock */ 344 outb(IO_TIMER1+TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT); 345 346 /* Correct rounding will buy us a better precision in timekeeping */ 347 outb(IO_TIMER1+TIMER_CNTR0, tval % 256); 348 outb(IO_TIMER1+TIMER_CNTR0, tval / 256); 349 350 rtclock_tval = tval ? tval : 0xFFFF; 351 rtclock_init = 1; 352 } 353 354 void 355 startrtclock(void) 356 { 357 int s; 358 359 if (!rtclock_init) 360 initrtclock(TIMER_FREQ); 361 362 /* Check diagnostic status */ 363 if ((s = mc146818_read(NULL, NVRAM_DIAG)) != 0) { /* XXX softc */ 364 char bits[128]; 365 snprintb(bits, sizeof(bits), NVRAM_DIAG_BITS, s); 366 printf("RTC BIOS diagnostic error %s\n", bits); 367 } 368 369 tc_init(&i8254_timecounter); 370 rtc_register(); 371 } 372 373 /* 374 * Must be called at splsched(). 375 */ 376 static void 377 tickle_tc(void) 378 { 379 #if defined(MULTIPROCESSOR) 380 struct cpu_info *ci = curcpu(); 381 /* 382 * If we are not the primary CPU, we're not allowed to do 383 * any more work. 384 */ 385 if (CPU_IS_PRIMARY(ci) == 0) 386 return; 387 #endif 388 if (rtclock_tval && timecounter->tc_get_timecount == i8254_get_timecount) { 389 __cpu_simple_lock(&tmr_lock); 390 if (i8254_ticked) 391 i8254_ticked = 0; 392 else { 393 i8254_offset += rtclock_tval; 394 i8254_lastcount = 0; 395 } 396 __cpu_simple_unlock(&tmr_lock); 397 } 398 399 } 400 401 static int 402 clockintr(void *arg, struct intrframe *frame) 403 { 404 tickle_tc(); 405 406 hardclock((struct clockframe *)frame); 407 408 #if NMCA > 0 409 if (MCA_system) { 410 /* Reset PS/2 clock interrupt by asserting bit 7 of port 0x61 */ 411 outb(0x61, inb(0x61) | 0x80); 412 } 413 #endif 414 return -1; 415 } 416 417 u_int 418 i8254_get_timecount(struct timecounter *tc) 419 { 420 u_int count; 421 uint16_t rdval; 422 u_long psl; 423 424 /* Don't want someone screwing with the counter while we're here. */ 425 psl = x86_read_psl(); 426 x86_disable_intr(); 427 __cpu_simple_lock(&tmr_lock); 428 /* Select timer0 and latch counter value. */ 429 outb(IO_TIMER1 + TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 430 /* insb to make the read atomic */ 431 rdval = inb(IO_TIMER1+TIMER_CNTR0); 432 rdval |= (inb(IO_TIMER1+TIMER_CNTR0) << 8); 433 count = rtclock_tval - rdval; 434 if (rtclock_tval && (count < i8254_lastcount && 435 (!i8254_ticked || rtclock_tval == 0xFFFF))) { 436 i8254_ticked = 1; 437 i8254_offset += rtclock_tval; 438 } 439 i8254_lastcount = count; 440 count += i8254_offset; 441 __cpu_simple_unlock(&tmr_lock); 442 x86_write_psl(psl); 443 444 return (count); 445 } 446 447 unsigned int 448 gettick(void) 449 { 450 uint16_t rdval; 451 u_long psl; 452 453 if (clock_broken_latch) 454 return (gettick_broken_latch()); 455 456 /* Don't want someone screwing with the counter while we're here. */ 457 psl = x86_read_psl(); 458 x86_disable_intr(); 459 __cpu_simple_lock(&tmr_lock); 460 /* Select counter 0 and latch it. */ 461 outb(IO_TIMER1+TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 462 rdval = inb(IO_TIMER1+TIMER_CNTR0); 463 rdval |= (inb(IO_TIMER1+TIMER_CNTR0) << 8); 464 __cpu_simple_unlock(&tmr_lock); 465 x86_write_psl(psl); 466 467 return rdval; 468 } 469 470 /* 471 * Wait approximately `n' microseconds. 472 * Relies on timer 1 counting down from (TIMER_FREQ / hz) at TIMER_FREQ Hz. 473 * Note: timer had better have been programmed before this is first used! 474 * (Note that we use `rate generator' mode, which counts at 1:1; `square 475 * wave' mode counts at 2:1). 476 * Don't rely on this being particularly accurate. 477 */ 478 void 479 i8254_delay(unsigned int n) 480 { 481 unsigned int cur_tick, initial_tick; 482 int remaining; 483 484 /* allow DELAY() to be used before startrtclock() */ 485 if (!rtclock_init) 486 initrtclock(TIMER_FREQ); 487 488 /* 489 * Read the counter first, so that the rest of the setup overhead is 490 * counted. 491 */ 492 initial_tick = gettick(); 493 494 if (n <= UINT_MAX / TIMER_FREQ) { 495 /* 496 * For unsigned arithmetic, division can be replaced with 497 * multiplication with the inverse and a shift. 498 */ 499 remaining = n * TIMER_FREQ / 1000000; 500 } else { 501 /* This is a very long delay. 502 * Being slow here doesn't matter. 503 */ 504 remaining = (unsigned long long) n * TIMER_FREQ / 1000000; 505 } 506 507 while (remaining > 1) { 508 #ifdef CLOCK_PARANOIA 509 int delta; 510 cur_tick = gettick(); 511 if (cur_tick > initial_tick) 512 delta = rtclock_tval - (cur_tick - initial_tick); 513 else 514 delta = initial_tick - cur_tick; 515 if (delta < 0 || delta >= rtclock_tval / 2) { 516 DPRINTF(("delay: ignore ticks %.4x-%.4x", 517 initial_tick, cur_tick)); 518 if (clock_broken_latch) { 519 DPRINTF((" (%.4x %.4x %.4x %.4x %.4x %.4x)\n", 520 ticks[0], ticks[1], ticks[2], 521 ticks[3], ticks[4], ticks[5])); 522 } else { 523 DPRINTF(("\n")); 524 } 525 } else 526 remaining -= delta; 527 #else 528 cur_tick = gettick(); 529 if (cur_tick > initial_tick) 530 remaining -= rtclock_tval - (cur_tick - initial_tick); 531 else 532 remaining -= initial_tick - cur_tick; 533 #endif 534 initial_tick = cur_tick; 535 } 536 } 537 538 #if (NPCPPI > 0) 539 int 540 sysbeepmatch(device_t parent, cfdata_t match, void *aux) 541 { 542 return (!ppi_attached); 543 } 544 545 void 546 sysbeepattach(device_t parent, device_t self, void *aux) 547 { 548 aprint_naive("\n"); 549 aprint_normal("\n"); 550 551 ppicookie = ((struct pcppi_attach_args *)aux)->pa_cookie; 552 ppi_attached = 1; 553 554 if (!pmf_device_register(self, NULL, NULL)) 555 aprint_error_dev(self, "couldn't establish power handler\n"); 556 } 557 558 int 559 sysbeepdetach(device_t self, int flags) 560 { 561 pmf_device_deregister(self); 562 ppi_attached = 0; 563 return 0; 564 } 565 #endif 566 567 void 568 sysbeep(int pitch, int period) 569 { 570 #if (NPCPPI > 0) 571 if (ppi_attached) 572 pcppi_bell(ppicookie, pitch, period, 0); 573 #endif 574 } 575 576 void 577 i8254_initclocks(void) 578 { 579 580 /* 581 * XXX If you're doing strange things with multiple clocks, you might 582 * want to keep track of clock handlers. 583 */ 584 (void)isa_intr_establish(NULL, 0, IST_PULSE, IPL_CLOCK, 585 (int (*)(void *))clockintr, 0); 586 } 587 588 static void 589 rtcinit(void) 590 { 591 static int first_rtcopen_ever = 1; 592 593 if (!first_rtcopen_ever) 594 return; 595 first_rtcopen_ever = 0; 596 597 mc146818_write(NULL, MC_REGA, /* XXX softc */ 598 MC_BASE_32_KHz | MC_RATE_1024_Hz); 599 mc146818_write(NULL, MC_REGB, MC_REGB_24HR); /* XXX softc */ 600 } 601 602 static int 603 rtcget(mc_todregs *regs) 604 { 605 606 rtcinit(); 607 if ((mc146818_read(NULL, MC_REGD) & MC_REGD_VRT) == 0) /* XXX softc */ 608 return (-1); 609 MC146818_GETTOD(NULL, regs); /* XXX softc */ 610 return (0); 611 } 612 613 static void 614 rtcput(mc_todregs *regs) 615 { 616 617 rtcinit(); 618 MC146818_PUTTOD(NULL, regs); /* XXX softc */ 619 } 620 621 /* 622 * check whether the CMOS layout is "standard"-like (ie, not PS/2-like), 623 * to be called at splclock() 624 */ 625 static int 626 cmoscheck(void) 627 { 628 int i; 629 unsigned short cksum = 0; 630 631 for (i = 0x10; i <= 0x2d; i++) 632 cksum += mc146818_read(NULL, i); /* XXX softc */ 633 634 return (cksum == (mc146818_read(NULL, 0x2e) << 8) 635 + mc146818_read(NULL, 0x2f)); 636 } 637 638 #if NMCA > 0 639 /* 640 * Check whether the CMOS layout is PS/2 like, to be called at splclock(). 641 */ 642 static int cmoscheckps2(void); 643 static int 644 cmoscheckps2(void) 645 { 646 #if 0 647 /* Disabled until I find out the CRC checksum algorithm IBM uses */ 648 int i; 649 unsigned short cksum = 0; 650 651 for (i = 0x10; i <= 0x31; i++) 652 cksum += mc146818_read(NULL, i); /* XXX softc */ 653 654 return (cksum == (mc146818_read(NULL, 0x32) << 8) 655 + mc146818_read(NULL, 0x33)); 656 #else 657 /* Check 'incorrect checksum' bit of IBM PS/2 Diagnostic Status Byte */ 658 return ((mc146818_read(NULL, NVRAM_DIAG) & (1<<6)) == 0); 659 #endif 660 } 661 #endif /* NMCA > 0 */ 662 663 /* 664 * patchable to control century byte handling: 665 * 1: always update 666 * -1: never touch 667 * 0: try to figure out itself 668 */ 669 int rtc_update_century = 0; 670 671 /* 672 * Expand a two-digit year as read from the clock chip 673 * into full width. 674 * Being here, deal with the CMOS century byte. 675 */ 676 static int centb = NVRAM_CENTURY; 677 static int 678 clock_expandyear(int clockyear) 679 { 680 int s, clockcentury, cmoscentury; 681 682 clockcentury = (clockyear < 70) ? 20 : 19; 683 clockyear += 100 * clockcentury; 684 685 if (rtc_update_century < 0) 686 return (clockyear); 687 688 s = splclock(); 689 if (cmoscheck()) 690 cmoscentury = mc146818_read(NULL, NVRAM_CENTURY); 691 #if NMCA > 0 692 else if (MCA_system && cmoscheckps2()) 693 cmoscentury = mc146818_read(NULL, (centb = 0x37)); 694 #endif 695 else 696 cmoscentury = 0; 697 splx(s); 698 if (!cmoscentury) { 699 #ifdef DIAGNOSTIC 700 printf("clock: unknown CMOS layout\n"); 701 #endif 702 return (clockyear); 703 } 704 cmoscentury = bcdtobin(cmoscentury); 705 706 if (cmoscentury != clockcentury) { 707 /* XXX note: saying "century is 20" might confuse the naive. */ 708 printf("WARNING: NVRAM century is %d but RTC year is %d\n", 709 cmoscentury, clockyear); 710 711 /* Kludge to roll over century. */ 712 if ((rtc_update_century > 0) || 713 ((cmoscentury == 19) && (clockcentury == 20) && 714 (clockyear == 2000))) { 715 printf("WARNING: Setting NVRAM century to %d\n", 716 clockcentury); 717 s = splclock(); 718 mc146818_write(NULL, centb, bintobcd(clockcentury)); 719 splx(s); 720 } 721 } else if (cmoscentury == 19 && rtc_update_century == 0) 722 rtc_update_century = 1; /* will update later in resettodr() */ 723 724 return (clockyear); 725 } 726 727 static int 728 rtc_get_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 729 { 730 int s; 731 mc_todregs rtclk; 732 733 s = splclock(); 734 if (rtcget(&rtclk)) { 735 splx(s); 736 return -1; 737 } 738 splx(s); 739 740 dt->dt_sec = bcdtobin(rtclk[MC_SEC]); 741 dt->dt_min = bcdtobin(rtclk[MC_MIN]); 742 dt->dt_hour = bcdtobin(rtclk[MC_HOUR]); 743 dt->dt_day = bcdtobin(rtclk[MC_DOM]); 744 dt->dt_mon = bcdtobin(rtclk[MC_MONTH]); 745 dt->dt_year = clock_expandyear(bcdtobin(rtclk[MC_YEAR])); 746 747 return 0; 748 } 749 750 static int 751 rtc_set_ymdhms(todr_chip_handle_t tch, struct clock_ymdhms *dt) 752 { 753 mc_todregs rtclk; 754 int century; 755 int s; 756 757 s = splclock(); 758 if (rtcget(&rtclk)) 759 memset(&rtclk, 0, sizeof(rtclk)); 760 splx(s); 761 762 rtclk[MC_SEC] = bintobcd(dt->dt_sec); 763 rtclk[MC_MIN] = bintobcd(dt->dt_min); 764 rtclk[MC_HOUR] = bintobcd(dt->dt_hour); 765 rtclk[MC_DOW] = dt->dt_wday + 1; 766 rtclk[MC_YEAR] = bintobcd(dt->dt_year % 100); 767 rtclk[MC_MONTH] = bintobcd(dt->dt_mon); 768 rtclk[MC_DOM] = bintobcd(dt->dt_day); 769 770 #ifdef DEBUG_CLOCK 771 printf("setclock: %x/%x/%x %x:%x:%x\n", rtclk[MC_YEAR], rtclk[MC_MONTH], 772 rtclk[MC_DOM], rtclk[MC_HOUR], rtclk[MC_MIN], rtclk[MC_SEC]); 773 #endif 774 s = splclock(); 775 rtcput(&rtclk); 776 if (rtc_update_century > 0) { 777 century = bintobcd(dt->dt_year / 100); 778 mc146818_write(NULL, centb, century); /* XXX softc */ 779 } 780 splx(s); 781 return 0; 782 783 } 784 785 static void 786 rtc_register(void) 787 { 788 static struct todr_chip_handle tch; 789 tch.todr_gettime_ymdhms = rtc_get_ymdhms; 790 tch.todr_settime_ymdhms = rtc_set_ymdhms; 791 tch.todr_setwen = NULL; 792 793 todr_attach(&tch); 794 } 795 796 void 797 setstatclockrate(int arg) 798 { 799 } 800
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