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mcclock.c revision 1.9 
      1 /* $NetBSD: mcclock.c,v 1.9 1997/09/02 13:18:23 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     31 
     32 __KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.9 1997/09/02 13:18:23 thorpej Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/kernel.h>
     36 #include <sys/systm.h>
     37 #include <sys/device.h>
     38 
     39 #include <dev/dec/clockvar.h>
     40 #include <dev/dec/mcclockvar.h>
     41 #include <dev/ic/mc146818reg.h>
     42 
     43 struct cfdriver mcclock_cd = {
     44 	NULL, "mcclock", DV_DULL,
     45 };
     46 
     47 void	mcclock_init __P((struct device *));
     48 void	mcclock_get __P((struct device *, time_t, struct clocktime *));
     49 void	mcclock_set __P((struct device *, struct clocktime *));
     50 
     51 const struct clockfns mcclock_clockfns = {
     52 	mcclock_init, mcclock_get, mcclock_set,
     53 };
     54 
     55 #define	mc146818_write(dev, reg, datum)					\
     56 	    (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
     57 #define	mc146818_read(dev, reg)						\
     58 	    (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
     59 
     60 void
     61 mcclock_attach(sc, busfns)
     62 	struct mcclock_softc *sc;
     63 	const struct mcclock_busfns *busfns;
     64 {
     65 
     66 	printf(": mc146818 or compatible");
     67 
     68 	sc->sc_busfns = busfns;
     69 
     70 	/* Turn interrupts off, just in case. */
     71 	mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
     72 
     73 	clockattach(&sc->sc_dev, &mcclock_clockfns);
     74 }
     75 
     76 void
     77 mcclock_init(dev)
     78 	struct device *dev;
     79 {
     80 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
     81 
     82 	mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_RATE_1024_Hz);
     83 	mc146818_write(sc, MC_REGB,
     84 	    MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
     85 }
     86 
     87 /*
     88  * Get the time of day, based on the clock's value and/or the base value.
     89  */
     90 void
     91 mcclock_get(dev, base, ct)
     92 	struct device *dev;
     93 	time_t base;
     94 	struct clocktime *ct;
     95 {
     96 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
     97 	mc_todregs regs;
     98 	int s;
     99 
    100 	s = splclock();
    101 	MC146818_GETTOD(sc, &regs)
    102 	splx(s);
    103 
    104 	ct->sec = regs[MC_SEC];
    105 	ct->min = regs[MC_MIN];
    106 	ct->hour = regs[MC_HOUR];
    107 	ct->dow = regs[MC_DOW];
    108 	ct->day = regs[MC_DOM];
    109 	ct->mon = regs[MC_MONTH];
    110 	ct->year = regs[MC_YEAR];
    111 }
    112 
    113 /*
    114  * Reset the TODR based on the time value.
    115  */
    116 void
    117 mcclock_set(dev, ct)
    118 	struct device *dev;
    119 	struct clocktime *ct;
    120 {
    121 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
    122 	mc_todregs regs;
    123 	int s;
    124 
    125 	s = splclock();
    126 	MC146818_GETTOD(sc, &regs);
    127 	splx(s);
    128 
    129 	regs[MC_SEC] = ct->sec;
    130 	regs[MC_MIN] = ct->min;
    131 	regs[MC_HOUR] = ct->hour;
    132 	regs[MC_DOW] = ct->dow;
    133 	regs[MC_DOM] = ct->day;
    134 	regs[MC_MONTH] = ct->mon;
    135 	regs[MC_YEAR] = ct->year;
    136 
    137 	s = splclock();
    138 	MC146818_PUTTOD(sc, &regs);
    139 	splx(s);
    140 }
    141