204 lines
5.1 KiB
C
204 lines
5.1 KiB
C
/* $NetBSD: rtclock.c,v 1.2 1997/01/15 01:29:25 perry Exp $ */
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/*
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* Copyright 1993, 1994 Masaru Oki
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* All rights reserved.
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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 Masaru Oki.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* X680x0 internal real time clock interface
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* alarm is not supported.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/file.h>
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#include <sys/kernel.h>
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#include <x68k/dev/rtclock_var.h>
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#include <x68k/x68k/iodevice.h>
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static u_long rtgettod __P((void));
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static int rtsettod __P((long));
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/*
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* x68k/clock.c calls thru this vector, if it is set, to read
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* the realtime clock.
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*/
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u_long (*gettod) __P((void));
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int (*settod)();
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static volatile union rtc *rtc_addr = 0;
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int
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rtclockinit()
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{
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rtc_addr = &IODEVbase->io_rtc;
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if (rtgettod()) {
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gettod = rtgettod;
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settod = rtsettod;
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} else {
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return 0;
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}
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return 1;
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}
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static int month_days[12] = {
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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static u_long
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rtgettod()
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{
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register int i;
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register u_long tmp;
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int year, month, day, hour, min, sec;
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/* hold clock */
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RTC_WRITE(rtc_addr, mode, RTC_HOLD_CLOCK);
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/* read it */
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sec = RTC_REG(sec10) * 10 + RTC_REG(sec);
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min = RTC_REG(min10) * 10 + RTC_REG(min);
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hour = RTC_REG(hour10) * 10 + RTC_REG(hour);
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day = RTC_REG(day10) * 10 + RTC_REG(day);
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month = RTC_REG(mon10) * 10 + RTC_REG(mon);
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year = RTC_REG(year10) * 10 + RTC_REG(year) + 1980;
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/* let it run again.. */
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RTC_WRITE(rtc_addr, mode, RTC_FREE_CLOCK);
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range_test(hour, 0, 23);
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range_test(day, 1, 31);
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range_test(month, 1, 12);
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range_test(year, STARTOFTIME, 2000);
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tmp = 0;
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for (i = STARTOFTIME; i < year; i++)
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tmp += days_in_year(i);
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if (leapyear(year) && month > FEBRUARY)
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tmp++;
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for (i = 1; i < month; i++)
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tmp += days_in_month(i);
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tmp += (day - 1);
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tmp = ((tmp * 24 + hour) * 60 + min + rtc_offset) * 60 + sec;
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return tmp;
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}
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static int
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rtsettod (tim)
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long tim;
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{
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/*
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* I don't know if setting the clock is analogous
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* to reading it, I don't have demo-code for setting.
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* just give it a try..
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*/
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register int i;
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register long hms, day;
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u_char sec1, sec2;
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u_char min1, min2;
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u_char hour1, hour2;
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u_char day1, day2;
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u_char mon1, mon2;
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u_char year1, year2;
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/*
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* there seem to be problems with the bitfield addressing
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* currently used..
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*/
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if (!rtc_addr)
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return 0;
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tim -= (rtc_offset * 60);
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/* prepare values to be written to clock */
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day = tim / SECDAY;
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hms = tim % SECDAY;
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hour2 = hms / 3600;
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hour1 = hour2 / 10;
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hour2 %= 10;
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min2 = (hms % 3600) / 60;
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min1 = min2 / 10;
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min2 %= 10;
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sec2 = (hms % 3600) % 60;
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sec1 = sec2 / 10;
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sec2 %= 10;
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/* Number of years in days */
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for (i = STARTOFTIME - 1980; day >= days_in_year(i); i++)
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day -= days_in_year(i);
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year1 = i / 10;
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year2 = i % 10;
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/* Number of months in days left */
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if (leapyear(i))
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days_in_month(FEBRUARY) = 29;
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for (i = 1; day >= days_in_month(i); i++)
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day -= days_in_month(i);
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days_in_month(FEBRUARY) = 28;
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mon1 = i / 10;
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mon2 = i % 10;
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/* Days are what is left over (+1) from all that. */
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day ++;
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day1 = day / 10;
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day2 = day % 10;
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RTC_WRITE(rtc_addr, mode, RTC_HOLD_CLOCK);
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RTC_WRITE(rtc_addr, sec10, sec1);
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RTC_WRITE(rtc_addr, sec, sec2);
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RTC_WRITE(rtc_addr, min10, min1);
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RTC_WRITE(rtc_addr, min, min2);
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RTC_WRITE(rtc_addr, hour10, hour1);
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RTC_WRITE(rtc_addr, hour, hour2);
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RTC_WRITE(rtc_addr, day10, day1);
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RTC_WRITE(rtc_addr, day, day2);
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RTC_WRITE(rtc_addr, mon10, mon1);
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RTC_WRITE(rtc_addr, mon, mon2);
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RTC_WRITE(rtc_addr, year10, year1);
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RTC_WRITE(rtc_addr, year, year2);
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RTC_WRITE(rtc_addr, mode, RTC_FREE_CLOCK);
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return 1;
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}
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