130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/* $NetBSD: rtc.c,v 1.2 1999/03/26 06:54:40 dbj Exp $ */
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/*
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* Copyright (c) 1997 Rolf Grossmann
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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 Rolf Grossmann.
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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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#include <sys/param.h>
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#include <next68k/dev/clockreg.h>
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#include <machine/cpu.h>
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#include <stand.h>
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u_char rtc_read __P((u_char reg));
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void rtc_init __P((void));
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time_t getsecs __P((void));
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/* ### where shall I put this definition? */
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#define DELAY(n) { register int N = (n); while (--N > 0); }
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static volatile u_int *scr2 = (u_int *)NEXT_P_SCR2_CON;
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static u_char new_clock;
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u_char
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rtc_read(u_char reg)
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{
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int i;
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u_int tmp;
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u_char val;
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*scr2 = (*scr2 & ~(SCR2_RTDATA | SCR2_RTCLK)) | SCR2_RTCE;
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DELAY(1);
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val = reg;
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for (i=0; i<8; i++) {
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tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK);
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if (val & 0x80)
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tmp |= SCR2_RTDATA;
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*scr2 = tmp;
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DELAY(1);
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*scr2 = tmp | SCR2_RTCLK;
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DELAY(1);
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*scr2 = tmp;
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DELAY(1);
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val <<= 1;
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}
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val = 0; /* should be anyway */
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for (i=0; i<8; i++) {
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val <<= 1;
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tmp = *scr2 & ~(SCR2_RTDATA | SCR2_RTCLK);
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*scr2 = tmp | SCR2_RTCLK;
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DELAY(1);
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*scr2 = tmp;
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DELAY(1);
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if (*scr2 & SCR2_RTDATA)
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val |= 1;
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}
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*scr2 &= ~(SCR2_RTDATA|SCR2_RTCLK|SCR2_RTCE);
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DELAY(1);
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return val;
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}
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void
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rtc_init(void)
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{
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u_char val;
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val = rtc_read(RTC_STATUS);
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new_clock = (val & RTC_NEW_CLOCK) ? 1 : 0;
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}
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time_t
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getsecs(void)
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{
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u_int secs;
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if (new_clock) {
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secs = rtc_read(RTC_CNTR3) << 24 |
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rtc_read(RTC_CNTR2) << 16 |
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rtc_read(RTC_CNTR1) << 8 |
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rtc_read(RTC_CNTR0);
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} else {
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u_char d,h,m,s;
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#define BCD_DECODE(x) (((x) >> 4) * 10 + ((x) & 0xf))
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d = rtc_read(RTC_DAY);
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h = rtc_read(RTC_HRS);
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m = rtc_read(RTC_MIN);
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s = rtc_read(RTC_SEC);
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secs = BCD_DECODE(d) * (60*60*24) +
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BCD_DECODE(h) * (60*60) +
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BCD_DECODE(m) * 60 +
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BCD_DECODE(s);
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}
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return secs;
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}
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