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mcclock.c revision 1.13 
      1 /* $NetBSD: mcclock.c,v 1.13 2001/11/13 12:49:45 lukem 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>
     31 __KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.13 2001/11/13 12:49:45 lukem Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/kernel.h>
     35 #include <sys/systm.h>
     36 #include <sys/device.h>
     37 
     38 #include <dev/dec/clockvar.h>
     39 #include <dev/dec/mcclockvar.h>
     40 #include <dev/ic/mc146818reg.h>
     41 
     42 /*
     43  * XXX rate is machine-dependent.
     44  */
     45 #ifdef __alpha__
     46 #define MC_DFEAULTRATE MC_RATE_1024_Hz
     47 #endif
     48 #ifdef pmax
     49 #define MC_DEFAULTRATE MC_RATE_256_Hz
     50 #endif
     51 
     52 
     53 void	mcclock_init __P((struct device *));
     54 void	mcclock_get __P((struct device *, time_t, struct clocktime *));
     55 void	mcclock_set __P((struct device *, struct clocktime *));
     56 
     57 const struct clockfns mcclock_clockfns = {
     58 	mcclock_init, mcclock_get, mcclock_set,
     59 };
     60 
     61 #define	mc146818_write(dev, reg, datum)					\
     62 	    (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
     63 #define	mc146818_read(dev, reg)						\
     64 	    (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
     65 
     66 void
     67 mcclock_attach(sc, busfns)
     68 	struct mcclock_softc *sc;
     69 	const struct mcclock_busfns *busfns;
     70 {
     71 
     72 	printf(": mc146818 or compatible");
     73 
     74 	sc->sc_busfns = busfns;
     75 
     76 	/* Turn interrupts off, just in case. */
     77 	mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
     78 
     79 	clockattach(&sc->sc_dev, &mcclock_clockfns);
     80 }
     81 
     82 void
     83 mcclock_init(dev)
     84 	struct device *dev;
     85 {
     86 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
     87 
     88 	mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
     89 	mc146818_write(sc, MC_REGB,
     90 	    MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
     91 }
     92 
     93 /*
     94  * Get the time of day, based on the clock's value and/or the base value.
     95  */
     96 void
     97 mcclock_get(dev, base, ct)
     98 	struct device *dev;
     99 	time_t base;
    100 	struct clocktime *ct;
    101 {
    102 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
    103 	mc_todregs regs;
    104 	int s;
    105 
    106 	s = splclock();
    107 	MC146818_GETTOD(sc, &regs)
    108 	splx(s);
    109 
    110 	ct->sec = regs[MC_SEC];
    111 	ct->min = regs[MC_MIN];
    112 	ct->hour = regs[MC_HOUR];
    113 	ct->dow = regs[MC_DOW];
    114 	ct->day = regs[MC_DOM];
    115 	ct->mon = regs[MC_MONTH];
    116 	ct->year = regs[MC_YEAR];
    117 }
    118 
    119 /*
    120  * Reset the TODR based on the time value.
    121  */
    122 void
    123 mcclock_set(dev, ct)
    124 	struct device *dev;
    125 	struct clocktime *ct;
    126 {
    127 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
    128 	mc_todregs regs;
    129 	int s;
    130 
    131 	s = splclock();
    132 	MC146818_GETTOD(sc, &regs);
    133 	splx(s);
    134 
    135 	regs[MC_SEC] = ct->sec;
    136 	regs[MC_MIN] = ct->min;
    137 	regs[MC_HOUR] = ct->hour;
    138 	regs[MC_DOW] = ct->dow;
    139 	regs[MC_DOM] = ct->day;
    140 	regs[MC_MONTH] = ct->mon;
    141 	regs[MC_YEAR] = ct->year;
    142 
    143 	s = splclock();
    144 	MC146818_PUTTOD(sc, &regs);
    145 	splx(s);
    146 }
    147