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mcclock.c revision 1.13
      1  1.13     lukem /* $NetBSD: mcclock.c,v 1.13 2001/11/13 12:49:45 lukem Exp $ */
      2   1.2       cgd 
      3   1.2       cgd /*
      4   1.2       cgd  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
      5   1.2       cgd  * All rights reserved.
      6   1.2       cgd  *
      7   1.2       cgd  * Author: Chris G. Demetriou
      8   1.2       cgd  *
      9   1.2       cgd  * Permission to use, copy, modify and distribute this software and
     10   1.2       cgd  * its documentation is hereby granted, provided that both the copyright
     11   1.2       cgd  * notice and this permission notice appear in all copies of the
     12   1.2       cgd  * software, derivative works or modified versions, and any portions
     13   1.2       cgd  * thereof, and that both notices appear in supporting documentation.
     14   1.2       cgd  *
     15   1.2       cgd  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16   1.2       cgd  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17   1.2       cgd  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18   1.2       cgd  *
     19   1.2       cgd  * Carnegie Mellon requests users of this software to return to
     20   1.2       cgd  *
     21   1.2       cgd  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22   1.2       cgd  *  School of Computer Science
     23   1.2       cgd  *  Carnegie Mellon University
     24   1.2       cgd  *  Pittsburgh PA 15213-3890
     25   1.2       cgd  *
     26   1.2       cgd  * any improvements or extensions that they make and grant Carnegie the
     27   1.2       cgd  * rights to redistribute these changes.
     28   1.2       cgd  */
     29   1.6       cgd 
     30  1.13     lukem #include <sys/cdefs.h>
     31  1.13     lukem __KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.13 2001/11/13 12:49:45 lukem Exp $");
     32   1.1       cgd 
     33   1.1       cgd #include <sys/param.h>
     34   1.1       cgd #include <sys/kernel.h>
     35   1.1       cgd #include <sys/systm.h>
     36   1.1       cgd #include <sys/device.h>
     37   1.1       cgd 
     38   1.8  jonathan #include <dev/dec/clockvar.h>
     39   1.8  jonathan #include <dev/dec/mcclockvar.h>
     40   1.1       cgd #include <dev/ic/mc146818reg.h>
     41   1.1       cgd 
     42  1.11  jonathan /*
     43  1.11  jonathan  * XXX rate is machine-dependent.
     44  1.12   thorpej  */
     45  1.12   thorpej #ifdef __alpha__
     46  1.11  jonathan #define MC_DFEAULTRATE MC_RATE_1024_Hz
     47  1.11  jonathan #endif
     48  1.12   thorpej #ifdef pmax
     49  1.11  jonathan #define MC_DEFAULTRATE MC_RATE_256_Hz
     50  1.11  jonathan #endif
     51  1.11  jonathan 
     52  1.11  jonathan 
     53   1.1       cgd void	mcclock_init __P((struct device *));
     54   1.1       cgd void	mcclock_get __P((struct device *, time_t, struct clocktime *));
     55   1.1       cgd void	mcclock_set __P((struct device *, struct clocktime *));
     56   1.1       cgd 
     57   1.1       cgd const struct clockfns mcclock_clockfns = {
     58   1.1       cgd 	mcclock_init, mcclock_get, mcclock_set,
     59   1.1       cgd };
     60   1.1       cgd 
     61   1.1       cgd #define	mc146818_write(dev, reg, datum)					\
     62   1.1       cgd 	    (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
     63   1.1       cgd #define	mc146818_read(dev, reg)						\
     64   1.1       cgd 	    (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
     65   1.1       cgd 
     66   1.1       cgd void
     67   1.1       cgd mcclock_attach(sc, busfns)
     68   1.1       cgd 	struct mcclock_softc *sc;
     69   1.1       cgd 	const struct mcclock_busfns *busfns;
     70   1.1       cgd {
     71   1.1       cgd 
     72   1.4  christos 	printf(": mc146818 or compatible");
     73   1.1       cgd 
     74   1.1       cgd 	sc->sc_busfns = busfns;
     75   1.1       cgd 
     76   1.1       cgd 	/* Turn interrupts off, just in case. */
     77   1.1       cgd 	mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
     78   1.1       cgd 
     79   1.1       cgd 	clockattach(&sc->sc_dev, &mcclock_clockfns);
     80   1.1       cgd }
     81   1.1       cgd 
     82   1.1       cgd void
     83   1.1       cgd mcclock_init(dev)
     84   1.1       cgd 	struct device *dev;
     85   1.1       cgd {
     86   1.1       cgd 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
     87   1.1       cgd 
     88  1.11  jonathan 	mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
     89   1.1       cgd 	mc146818_write(sc, MC_REGB,
     90   1.5       cgd 	    MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
     91   1.1       cgd }
     92   1.1       cgd 
     93   1.1       cgd /*
     94   1.1       cgd  * Get the time of day, based on the clock's value and/or the base value.
     95   1.1       cgd  */
     96   1.1       cgd void
     97   1.1       cgd mcclock_get(dev, base, ct)
     98   1.1       cgd 	struct device *dev;
     99   1.1       cgd 	time_t base;
    100   1.1       cgd 	struct clocktime *ct;
    101   1.1       cgd {
    102   1.1       cgd 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
    103   1.1       cgd 	mc_todregs regs;
    104   1.1       cgd 	int s;
    105   1.1       cgd 
    106   1.1       cgd 	s = splclock();
    107   1.1       cgd 	MC146818_GETTOD(sc, &regs)
    108   1.1       cgd 	splx(s);
    109   1.1       cgd 
    110   1.1       cgd 	ct->sec = regs[MC_SEC];
    111   1.1       cgd 	ct->min = regs[MC_MIN];
    112   1.1       cgd 	ct->hour = regs[MC_HOUR];
    113   1.1       cgd 	ct->dow = regs[MC_DOW];
    114   1.1       cgd 	ct->day = regs[MC_DOM];
    115   1.1       cgd 	ct->mon = regs[MC_MONTH];
    116   1.1       cgd 	ct->year = regs[MC_YEAR];
    117   1.1       cgd }
    118   1.1       cgd 
    119   1.1       cgd /*
    120   1.1       cgd  * Reset the TODR based on the time value.
    121   1.1       cgd  */
    122   1.1       cgd void
    123   1.1       cgd mcclock_set(dev, ct)
    124   1.1       cgd 	struct device *dev;
    125   1.1       cgd 	struct clocktime *ct;
    126   1.1       cgd {
    127   1.1       cgd 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
    128   1.1       cgd 	mc_todregs regs;
    129   1.1       cgd 	int s;
    130   1.1       cgd 
    131   1.1       cgd 	s = splclock();
    132   1.1       cgd 	MC146818_GETTOD(sc, &regs);
    133   1.1       cgd 	splx(s);
    134   1.1       cgd 
    135   1.1       cgd 	regs[MC_SEC] = ct->sec;
    136   1.1       cgd 	regs[MC_MIN] = ct->min;
    137   1.1       cgd 	regs[MC_HOUR] = ct->hour;
    138   1.1       cgd 	regs[MC_DOW] = ct->dow;
    139   1.1       cgd 	regs[MC_DOM] = ct->day;
    140   1.1       cgd 	regs[MC_MONTH] = ct->mon;
    141   1.1       cgd 	regs[MC_YEAR] = ct->year;
    142   1.1       cgd 
    143   1.1       cgd 	s = splclock();
    144   1.1       cgd 	MC146818_PUTTOD(sc, &regs);
    145   1.1       cgd 	splx(s);
    146   1.1       cgd }
    147