b42cba33a3
then knocked the extra digits off). Blegh. Update the comment and adjustment method reading the chip clock year register to note that anything less than 70 means we're past the year 2000.
150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: mcclock.c,v 1.11 1998/04/19 07:50:25 jonathan Exp $ */
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/*
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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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/bus.h>
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#include <machine/clockvar.h>
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#include <dev/dec/mcclockvar.h>
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#include <dev/dec/mc146818reg.h>
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/*
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* XXX rate is machine-dependent.
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*/
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#ifdef __alpha__
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#define MC_DEFAULTRATE MC_RATE_1024_Hz
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#endif
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#ifdef __pmax__
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#define MC_DEFAULTRATE MC_RATE_256_Hz
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#endif
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void
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mcclock_attach(device_t dev)
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{
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/* Turn interrupts off, just in case. */
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MCCLOCK_WRITE(dev, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
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clockattach(dev);
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}
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void
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mcclock_init(device_t dev)
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{
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MCCLOCK_WRITE(dev, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
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MCCLOCK_WRITE(dev, MC_REGB,
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MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
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}
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/*
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* Get the time of day, based on the clock's value and/or the base value.
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*/
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void
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mcclock_get(device_t dev, time_t base, struct clocktime *ct)
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{
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mc_todregs regs;
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int s;
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s = splclock();
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MC146818_GETTOD(dev, ®s)
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splx(s);
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ct->sec = regs[MC_SEC];
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ct->min = regs[MC_MIN];
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ct->hour = regs[MC_HOUR];
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ct->dow = regs[MC_DOW];
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ct->day = regs[MC_DOM];
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ct->mon = regs[MC_MONTH];
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ct->year = regs[MC_YEAR];
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/*
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* This chip is not y2k compliant- If it's less than
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* 70, we're clearly past the year 2000.
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*/
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if (ct->year < 70) {
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ct->year += 100;
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}
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}
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/*
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* Reset the TODR based on the time value.
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*/
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void
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mcclock_set(device_t dev, struct clocktime *ct)
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{
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mc_todregs regs;
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int s;
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s = splclock();
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MC146818_GETTOD(dev, ®s);
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splx(s);
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regs[MC_SEC] = ct->sec;
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regs[MC_MIN] = ct->min;
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regs[MC_HOUR] = ct->hour;
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regs[MC_DOW] = ct->dow;
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regs[MC_DOM] = ct->day;
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regs[MC_MONTH] = ct->mon;
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/*
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* This chip is not y2k compliant- write it with
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* no more than two digits.
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*/
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regs[MC_YEAR] = ct->year % 100;
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s = splclock();
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MC146818_PUTTOD(dev, ®s);
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splx(s);
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}
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int
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mcclock_getsecs(device_t dev, int *secp)
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{
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int timeout = 100000000;
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int sec;
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int s;
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s = splclock();
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for (;;) {
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if (!(MCCLOCK_READ(dev, MC_REGA) & MC_REGA_UIP)) {
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sec = MCCLOCK_READ(dev, MC_SEC);
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break;
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}
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if (--timeout == 0)
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goto fail;
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}
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splx(s);
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*secp = sec;
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return 0;
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fail:
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splx(s);
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return ETIMEDOUT;
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}
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