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mcclock.c revision 1.1 
      1 /* XXX COPYRIGHT */
      2 
      3 #include <sys/param.h>
      4 #include <sys/kernel.h>
      5 #include <sys/systm.h>
      6 #include <sys/device.h>
      7 
      8 #include <alpha/alpha/clockvar.h>
      9 #include <alpha/alpha/mcclockvar.h>
     10 #include <dev/ic/mc146818reg.h>
     11 
     12 struct cfdriver mcclock_cd = {
     13 	NULL, "mcclock", DV_DULL,
     14 };
     15 
     16 void	mcclock_init __P((struct device *));
     17 void	mcclock_get __P((struct device *, time_t, struct clocktime *));
     18 void	mcclock_set __P((struct device *, struct clocktime *));
     19 
     20 const struct clockfns mcclock_clockfns = {
     21 	mcclock_init, mcclock_get, mcclock_set,
     22 };
     23 
     24 #define	mc146818_write(dev, reg, datum)					\
     25 	    (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
     26 #define	mc146818_read(dev, reg)						\
     27 	    (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
     28 
     29 void
     30 mcclock_attach(sc, busfns)
     31 	struct mcclock_softc *sc;
     32 	const struct mcclock_busfns *busfns;
     33 {
     34 
     35 	printf(": mc146818 or compatible");
     36 
     37 	sc->sc_busfns = busfns;
     38 
     39 	/* Turn interrupts off, just in case. */
     40 	mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
     41 
     42 	clockattach(&sc->sc_dev, &mcclock_clockfns);
     43 }
     44 
     45 void
     46 mcclock_init(dev)
     47 	struct device *dev;
     48 {
     49 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
     50 
     51 	mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_RATE_1024_Hz);
     52 	mc146818_write(sc, MC_REGB,
     53 	    MC_REGB_PIE | MC_REGB_BINARY | MC_REGB_24HR);
     54 }
     55 
     56 /*
     57  * Get the time of day, based on the clock's value and/or the base value.
     58  */
     59 void
     60 mcclock_get(dev, base, ct)
     61 	struct device *dev;
     62 	time_t base;
     63 	struct clocktime *ct;
     64 {
     65 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
     66 	mc_todregs regs;
     67 	int s;
     68 
     69 	s = splclock();
     70 	MC146818_GETTOD(sc, &regs)
     71 	splx(s);
     72 
     73 	ct->sec = regs[MC_SEC];
     74 	ct->min = regs[MC_MIN];
     75 	ct->hour = regs[MC_HOUR];
     76 	ct->dow = regs[MC_DOW];
     77 	ct->day = regs[MC_DOM];
     78 	ct->mon = regs[MC_MONTH];
     79 	ct->year = regs[MC_YEAR];
     80 }
     81 
     82 /*
     83  * Reset the TODR based on the time value.
     84  */
     85 void
     86 mcclock_set(dev, ct)
     87 	struct device *dev;
     88 	struct clocktime *ct;
     89 {
     90 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
     91 	mc_todregs regs;
     92 	int s;
     93 
     94 	s = splclock();
     95 	MC146818_GETTOD(sc, &regs);
     96 	splx(s);
     97 
     98 	regs[MC_SEC] = ct->sec;
     99 	regs[MC_MIN] = ct->min;
    100 	regs[MC_HOUR] = ct->hour;
    101 	regs[MC_DOW] = ct->dow;
    102 	regs[MC_DOM] = ct->day;
    103 	regs[MC_MONTH] = ct->mon;
    104 	regs[MC_YEAR] = ct->year;
    105 
    106 	s = splclock();
    107 	MC146818_PUTTOD(sc, &regs);
    108 	splx(s);
    109 }
    110