189 lines
4.3 KiB
C
189 lines
4.3 KiB
C
/* $NetBSD: mcclock.c,v 1.15 2001/12/05 10:54:51 simonb 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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.15 2001/12/05 10:54:51 simonb Exp $");
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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/device.h>
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#include <dev/dec/clockvar.h>
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#include <dev/dec/mcclockvar.h>
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#include <dev/ic/mc146818reg.h>
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/*
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* XXX default rate is machine-dependent.
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*/
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#ifdef __alpha__
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#define MC_DFEAULTHZ 1024
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#endif
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#ifdef pmax
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#define MC_DEFAULTHZ 256
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#endif
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void mcclock_init __P((struct device *));
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void mcclock_get __P((struct device *, time_t, struct clocktime *));
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void mcclock_set __P((struct device *, struct clocktime *));
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const struct clockfns mcclock_clockfns = {
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mcclock_init, mcclock_get, mcclock_set,
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};
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#define mc146818_write(dev, reg, datum) \
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(*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
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#define mc146818_read(dev, reg) \
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(*(dev)->sc_busfns->mc_bf_read)(dev, reg)
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void
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mcclock_attach(sc, busfns)
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struct mcclock_softc *sc;
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const struct mcclock_busfns *busfns;
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{
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printf(": mc146818 or compatible");
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sc->sc_busfns = busfns;
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/* Turn interrupts off, just in case. */
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mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
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clockattach(&sc->sc_dev, &mcclock_clockfns);
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}
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void
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mcclock_init(dev)
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struct device *dev;
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{
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struct mcclock_softc *sc = (struct mcclock_softc *)dev;
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int rate;
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again:
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switch (hz) {
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case 32:
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rate = MC_BASE_32_KHz | MC_RATE_32_Hz;
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break;
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case 64:
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rate = MC_BASE_32_KHz | MC_RATE_64_Hz;
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break;
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case 128:
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rate = MC_BASE_32_KHz | MC_RATE_128_Hz;
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break;
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case 256:
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rate = MC_BASE_32_KHz | MC_RATE_256_Hz;
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break;
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case 512:
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rate = MC_BASE_32_KHz | MC_RATE_512_Hz;
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break;
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case 1024:
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rate = MC_BASE_32_KHz | MC_RATE_1024_Hz;
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break;
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case 2048:
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rate = MC_BASE_32_KHz | MC_RATE_2048_Hz;
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break;
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case 4096:
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rate = MC_BASE_32_KHz | MC_RATE_4096_Hz;
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break;
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case 8192:
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rate = MC_BASE_32_KHz | MC_RATE_8192_Hz;
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break;
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case 16384:
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rate = MC_BASE_4_MHz | MC_RATE_1;
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break;
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case 32768:
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rate = MC_BASE_4_MHz | MC_RATE_2;
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break;
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default:
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printf("%s: Cannot get %d Hz clock; using %d Hz\n",
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sc->sc_dev.dv_xname, hz, MC_DEFAULTHZ);
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hz = MC_DEFAULTHZ;
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goto again;
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}
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mc146818_write(sc, MC_REGA, rate);
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mc146818_write(sc, 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(dev, base, ct)
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struct device *dev;
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time_t base;
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struct clocktime *ct;
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{
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struct mcclock_softc *sc = (struct mcclock_softc *)dev;
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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(sc, ®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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/*
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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(dev, ct)
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struct device *dev;
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struct clocktime *ct;
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{
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struct mcclock_softc *sc = (struct mcclock_softc *)dev;
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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(sc, ®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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regs[MC_YEAR] = ct->year;
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s = splclock();
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MC146818_PUTTOD(sc, ®s);
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splx(s);
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}
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