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/* $OpenBSD: mcclock.c,v 1.5 2002/03/14 01:26:26 millert Exp $ */
/* $NetBSD: mcclock.c,v 1.4 1996/10/13 02:59:41 christos Exp $ */
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <alpha/alpha/clockvar.h>
#include <alpha/alpha/mcclockvar.h>
#include <dev/ic/mc146818reg.h>
struct cfdriver mcclock_cd = {
NULL, "mcclock", DV_DULL,
};
void mcclock_init(struct device *);
void mcclock_get(struct device *, time_t, struct clocktime *);
void mcclock_set(struct device *, struct clocktime *);
const struct clockfns mcclock_clockfns = {
mcclock_init, mcclock_get, mcclock_set,
};
#define mc146818_write(dev, reg, datum) \
(*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
#define mc146818_read(dev, reg) \
(*(dev)->sc_busfns->mc_bf_read)(dev, reg)
void
mcclock_attach(sc, busfns)
struct mcclock_softc *sc;
const struct mcclock_busfns *busfns;
{
printf(": mc146818 or compatible");
sc->sc_busfns = busfns;
/* Turn interrupts off, just in case. */
mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
clockattach(&sc->sc_dev, &mcclock_clockfns);
}
void
mcclock_init(dev)
struct device *dev;
{
struct mcclock_softc *sc = (struct mcclock_softc *)dev;
mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_RATE_1024_Hz);
mc146818_write(sc, MC_REGB,
MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
}
/*
* Get the time of day, based on the clock's value and/or the base value.
*/
void
mcclock_get(dev, base, ct)
struct device *dev;
time_t base;
struct clocktime *ct;
{
struct mcclock_softc *sc = (struct mcclock_softc *)dev;
mc_todregs regs;
int s;
s = splclock();
MC146818_GETTOD(sc, ®s)
splx(s);
ct->sec = regs[MC_SEC];
ct->min = regs[MC_MIN];
ct->hour = regs[MC_HOUR];
ct->dow = regs[MC_DOW];
ct->day = regs[MC_DOM];
ct->mon = regs[MC_MONTH];
ct->year = regs[MC_YEAR];
}
/*
* Reset the TODR based on the time value.
*/
void
mcclock_set(dev, ct)
struct device *dev;
struct clocktime *ct;
{
struct mcclock_softc *sc = (struct mcclock_softc *)dev;
mc_todregs regs;
int s;
s = splclock();
MC146818_GETTOD(sc, ®s);
splx(s);
regs[MC_SEC] = ct->sec;
regs[MC_MIN] = ct->min;
regs[MC_HOUR] = ct->hour;
regs[MC_DOW] = ct->dow;
regs[MC_DOM] = ct->day;
regs[MC_MONTH] = ct->mon;
regs[MC_YEAR] = ct->year;
s = splclock();
MC146818_PUTTOD(sc, ®s);
splx(s);
}
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