Moved to /cvsroot/syssrc/sys/arch/arc/arc/clock.c,v
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/* $NetBSD: clock.c,v 1.7 1998/01/12 20:04:30 thorpej Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department and Ralph Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah Hdr: clock.c 1.18 91/01/21
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*
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* from: @(#)clock.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <machine/autoconf.h>
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#include <machine/machConst.h>
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#include <pica/pica/clockvar.h>
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#include <pica/pica/picatype.h>
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extern int cputype; /* What kind of cpu we are running on */
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/* Definition of the driver for autoconfig. */
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static int clockmatch __P((struct device *, void *, void *));
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static void clockattach __P((struct device *, struct device *, void *));
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struct cfattach clock_ca = {
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sizeof(struct clock_softc), clockmatch, clockattach
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};
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extern struct cfdriver clock_cd;
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void mcclock_attach __P((struct device *, struct device *, void *));
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#define SECMIN ((unsigned)60) /* seconds per minute */
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#define SECHOUR ((unsigned)(60*SECMIN)) /* seconds per hour */
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#define SECDAY ((unsigned)(24*SECHOUR)) /* seconds per day */
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#define SECYR ((unsigned)(365*SECDAY)) /* seconds per common year */
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#define LEAPYEAR(year) (((year) % 4) == 0)
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static int
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clockmatch(parent, cfdata, aux)
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struct device *parent;
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void *cfdata;
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void *aux;
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{
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struct cfdata *cf = cfdata;
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struct confargs *ca = aux;
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/* See how many clocks this system has */
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switch (cputype) {
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case MIPS_PICA_61:
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/* make sure that we're looking for this type of device. */
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if (!BUS_MATCHNAME(ca, "dallas_rtc"))
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return (0);
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if (cf->cf_unit >= 1)
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return (0);
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break;
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default:
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panic("unknown CPU");
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}
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return (1);
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}
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static void
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clockattach(parent, self, aux)
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struct device *parent;
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struct device *self;
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void *aux;
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{
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switch (cputype) {
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case MIPS_PICA_61:
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mcclock_attach(parent, self, aux);
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break;
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default:
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panic("clockattach: it didn't get here. really.");
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}
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/*
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* establish the clock interrupt; it's a special case
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*/
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BUS_INTR_ESTABLISH((struct confargs *)aux,
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(intr_handler_t) hardclock, self);
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printf("\n");
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}
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/*
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* Wait "n" microseconds. This doesn't belong here. XXX.
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*/
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void
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delay(n)
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int n;
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{
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DELAY(n);
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}
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/*
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* Machine-dependent clock routines.
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*
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* Startrtclock restarts the real-time clock, which provides
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* hardclock interrupts to kern_clock.c.
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*
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* Inittodr initializes the time of day hardware which provides
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* date functions. Its primary function is to use some file
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* system information in case the hardare clock lost state.
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*
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* Resettodr restores the time of day hardware after a time change.
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*/
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/*
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* Start the real-time and statistics clocks. Leave stathz 0 since there
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* are no other timers available.
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*/
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void
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cpu_initclocks()
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{
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extern int tickadj;
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struct clock_softc *csc = (struct clock_softc *)clock_cd.cd_devs[0];
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hz = 100; /* 100 Hz */
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tick = 1000000 / hz; /* number of micro-seconds between interrupts */
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/*
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* Start the clock.
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*/
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(*csc->sc_init)(csc);
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}
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/*
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* We assume newhz is either stathz or profhz, and that neither will
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* change after being set up above. Could recalculate intervals here
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* but that would be a drag.
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*/
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void
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setstatclockrate(newhz)
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int newhz;
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{
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}
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/*
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* This code is defunct after 2099.
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* Will Unix still be here then??
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*/
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static short dayyr[12] = {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
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};
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/*
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* Initialze the time of day register, based on the time base which is, e.g.
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* from a filesystem. Base provides the time to within six months,
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* and the time of year clock (if any) provides the rest.
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*/
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void
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inittodr(base)
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time_t base;
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{
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struct tod_time c;
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struct clock_softc *csc = (struct clock_softc *)clock_cd.cd_devs[0];
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register int days, yr;
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long deltat;
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int badbase, s;
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if (base < 5*SECYR) {
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printf("WARNING: preposterous time in file system");
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/* read the system clock anyway */
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base = 6*SECYR + 186*SECDAY + SECDAY/2;
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badbase = 1;
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} else
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badbase = 0;
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/* Read RTC chip registers */
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(*csc->sc_get)(csc, base, &c);
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csc->sc_initted = 1;
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/* simple sanity checks */
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c.year = c.year+80; /* must be multiple of 4 because chip knows leap */
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if (c.year < 70 || c.mon < 1 || c.mon > 12 || c.day < 1 ||
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c.day > 31 || c.hour > 23 || c.min > 59 || c.sec > 59) {
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/*
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* Believe the time in the file system for lack of
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* anything better, resetting the TODR.
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*/
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time.tv_sec = base;
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if (!badbase) {
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printf("WARNING: preposterous clock chip time\n");
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resettodr();
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}
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goto bad;
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}
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days = 0;
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for (yr = 70; yr < c.year; yr++)
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days += LEAPYEAR(yr) ? 366 : 365;
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days += dayyr[c.mon - 1] + c.day - 1;
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if (LEAPYEAR(yr) && c.mon > 2)
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days++;
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/* now have days since Jan 1, 1970; the rest is easy... */
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time.tv_sec = days * SECDAY + c.hour * 3600 + c.min * 60 + c.sec;
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if (!badbase) {
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/*
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* See if we gained/lost two or more days;
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* if so, assume something is amiss.
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*/
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deltat = time.tv_sec - base;
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if (deltat < 0)
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deltat = -deltat;
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if (deltat < 2 * SECDAY)
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return;
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printf("WARNING: clock %s %d days",
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time.tv_sec < base ? "lost" : "gained", deltat / SECDAY);
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}
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bad:
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printf(" -- CHECK AND RESET THE DATE!\n");
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}
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/*
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* Reset the TODR based on the time value; used when the TODR
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* has a preposterous value and also when the time is reset
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* by the stime system call. Also called when the TODR goes past
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* TODRZERO + 100*(SECYEAR+2*SECDAY) (e.g. on Jan 2 just after midnight)
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* to wrap the TODR around.
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*/
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void
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resettodr()
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{
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struct tod_time c;
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struct clock_softc *csc = (struct clock_softc *)clock_cd.cd_devs[0];
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register int t, t2;
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int s;
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if(!csc->sc_initted)
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return;
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/* compute the day of week. 1 is Sunday*/
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t2 = time.tv_sec / SECDAY;
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c.dow = (t2 + 5) % 7; /* 1/1/1970 was thursday */
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/* compute the year */
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t2 = time.tv_sec / SECDAY;
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c.year = 69;
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while (t2 >= 0) { /* whittle off years */
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t = t2;
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c.year++;
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t2 -= LEAPYEAR(c.year) ? 366 : 365;
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}
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/* t = month + day; separate */
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t2 = LEAPYEAR(c.year);
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for (c.mon = 1; c.mon < 12; c.mon++)
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if (t < dayyr[c.mon] + (t2 && c.mon > 1))
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break;
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c.day = t - dayyr[c.mon - 1] + 1;
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if (t2 && c.mon > 2)
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c.day--;
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/* the rest is easy */
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t = time.tv_sec % SECDAY;
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c.hour = t / 3600;
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t %= 3600;
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c.min = t / 60;
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c.sec = t % 60;
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c.year = c.year-80; /* must be multiple of 4 because chip knows leap */
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(*csc->sc_set)(csc, &c);
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}
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