NetBSD/sys/arch/x68k/dev/rtclock.c

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/* $NetBSD: rtclock.c,v 1.3 1997/10/12 12:13:52 oki Exp $ */
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/*
* Copyright 1993, 1994 Masaru Oki
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Masaru Oki.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* X680x0 internal real time clock interface
* alarm is not supported.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/file.h>
#include <sys/kernel.h>
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#include <x68k/dev/rtclock_var.h>
#include <x68k/x68k/iodevice.h>
static u_long rtgettod __P((void));
static int rtsettod __P((long));
/*
* x68k/clock.c calls thru this vector, if it is set, to read
* the realtime clock.
*/
u_long (*gettod) __P((void));
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int (*settod) __P((long));
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static volatile union rtc *rtc_addr = 0;
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int rtclockinit __P((void));
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int
rtclockinit()
{
rtc_addr = &IODEVbase->io_rtc;
if (rtgettod()) {
gettod = rtgettod;
settod = rtsettod;
} else {
return 0;
}
return 1;
}
static int month_days[12] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
static u_long
rtgettod()
{
register int i;
register u_long tmp;
int year, month, day, hour, min, sec;
/* hold clock */
RTC_WRITE(rtc_addr, mode, RTC_HOLD_CLOCK);
/* read it */
sec = RTC_REG(sec10) * 10 + RTC_REG(sec);
min = RTC_REG(min10) * 10 + RTC_REG(min);
hour = RTC_REG(hour10) * 10 + RTC_REG(hour);
day = RTC_REG(day10) * 10 + RTC_REG(day);
month = RTC_REG(mon10) * 10 + RTC_REG(mon);
year = RTC_REG(year10) * 10 + RTC_REG(year) + 1980;
/* let it run again.. */
RTC_WRITE(rtc_addr, mode, RTC_FREE_CLOCK);
range_test(hour, 0, 23);
range_test(day, 1, 31);
range_test(month, 1, 12);
range_test(year, STARTOFTIME, 2000);
tmp = 0;
for (i = STARTOFTIME; i < year; i++)
tmp += days_in_year(i);
if (leapyear(year) && month > FEBRUARY)
tmp++;
for (i = 1; i < month; i++)
tmp += days_in_month(i);
tmp += (day - 1);
tmp = ((tmp * 24 + hour) * 60 + min + rtc_offset) * 60 + sec;
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return tmp;
}
static int
rtsettod (tim)
long tim;
{
/*
* I don't know if setting the clock is analogous
* to reading it, I don't have demo-code for setting.
* just give it a try..
*/
register int i;
register long hms, day;
u_char sec1, sec2;
u_char min1, min2;
u_char hour1, hour2;
u_char day1, day2;
u_char mon1, mon2;
u_char year1, year2;
/*
* there seem to be problems with the bitfield addressing
* currently used..
*/
if (!rtc_addr)
return 0;
tim -= (rtc_offset * 60);
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/* prepare values to be written to clock */
day = tim / SECDAY;
hms = tim % SECDAY;
hour2 = hms / 3600;
hour1 = hour2 / 10;
hour2 %= 10;
min2 = (hms % 3600) / 60;
min1 = min2 / 10;
min2 %= 10;
sec2 = (hms % 3600) % 60;
sec1 = sec2 / 10;
sec2 %= 10;
/* Number of years in days */
for (i = STARTOFTIME - 1980; day >= days_in_year(i); i++)
day -= days_in_year(i);
year1 = i / 10;
year2 = i % 10;
/* Number of months in days left */
if (leapyear(i))
days_in_month(FEBRUARY) = 29;
for (i = 1; day >= days_in_month(i); i++)
day -= days_in_month(i);
days_in_month(FEBRUARY) = 28;
mon1 = i / 10;
mon2 = i % 10;
/* Days are what is left over (+1) from all that. */
day ++;
day1 = day / 10;
day2 = day % 10;
RTC_WRITE(rtc_addr, mode, RTC_HOLD_CLOCK);
RTC_WRITE(rtc_addr, sec10, sec1);
RTC_WRITE(rtc_addr, sec, sec2);
RTC_WRITE(rtc_addr, min10, min1);
RTC_WRITE(rtc_addr, min, min2);
RTC_WRITE(rtc_addr, hour10, hour1);
RTC_WRITE(rtc_addr, hour, hour2);
RTC_WRITE(rtc_addr, day10, day1);
RTC_WRITE(rtc_addr, day, day2);
RTC_WRITE(rtc_addr, mon10, mon1);
RTC_WRITE(rtc_addr, mon, mon2);
RTC_WRITE(rtc_addr, year10, year1);
RTC_WRITE(rtc_addr, year, year2);
RTC_WRITE(rtc_addr, mode, RTC_FREE_CLOCK);
return 1;
}