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mcclock.c revision 1.16 
      1 /* $NetBSD: mcclock.c,v 1.16 2005/02/04 02:10:36 perry 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 1.16 2005/02/04 02:10:36 perry 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 default rate is machine-dependent.
     44  */
     45 #ifdef __alpha__
     46 #define MC_DFEAULTHZ	1024
     47 #endif
     48 #ifdef pmax
     49 #define MC_DEFAULTHZ	256
     50 #endif
     51 
     52 
     53 void	mcclock_init(struct device *);
     54 void	mcclock_get(struct device *, time_t, struct clocktime *);
     55 void	mcclock_set(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 	int rate;
     88 
     89 again:
     90 	switch (hz) {
     91 	case 32:
     92 		rate = MC_BASE_32_KHz | MC_RATE_32_Hz;
     93 		break;
     94 	case 64:
     95 		rate = MC_BASE_32_KHz | MC_RATE_64_Hz;
     96 		break;
     97 	case 128:
     98 		rate = MC_BASE_32_KHz | MC_RATE_128_Hz;
     99 		break;
    100 	case 256:
    101 		rate = MC_BASE_32_KHz | MC_RATE_256_Hz;
    102 		break;
    103 	case 512:
    104 		rate = MC_BASE_32_KHz | MC_RATE_512_Hz;
    105 		break;
    106 	case 1024:
    107 		rate = MC_BASE_32_KHz | MC_RATE_1024_Hz;
    108 		break;
    109 	case 2048:
    110 		rate = MC_BASE_32_KHz | MC_RATE_2048_Hz;
    111 		break;
    112 	case 4096:
    113 		rate = MC_BASE_32_KHz | MC_RATE_4096_Hz;
    114 		break;
    115 	case 8192:
    116 		rate = MC_BASE_32_KHz | MC_RATE_8192_Hz;
    117 		break;
    118 	case 16384:
    119 		rate = MC_BASE_4_MHz | MC_RATE_1;
    120 		break;
    121 	case 32768:
    122 		rate = MC_BASE_4_MHz | MC_RATE_2;
    123 		break;
    124 	default:
    125 		printf("%s: Cannot get %d Hz clock; using %d Hz\n",
    126 		    sc->sc_dev.dv_xname, hz, MC_DEFAULTHZ);
    127 		hz = MC_DEFAULTHZ;
    128 		goto again;
    129 	}
    130 	mc146818_write(sc, MC_REGA, rate);
    131 	mc146818_write(sc, MC_REGB,
    132 	    MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
    133 }
    134 
    135 /*
    136  * Get the time of day, based on the clock's value and/or the base value.
    137  */
    138 void
    139 mcclock_get(dev, base, ct)
    140 	struct device *dev;
    141 	time_t base;
    142 	struct clocktime *ct;
    143 {
    144 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
    145 	mc_todregs regs;
    146 	int s;
    147 
    148 	s = splclock();
    149 	MC146818_GETTOD(sc, &regs)
    150 	splx(s);
    151 
    152 	ct->sec = regs[MC_SEC];
    153 	ct->min = regs[MC_MIN];
    154 	ct->hour = regs[MC_HOUR];
    155 	ct->dow = regs[MC_DOW];
    156 	ct->day = regs[MC_DOM];
    157 	ct->mon = regs[MC_MONTH];
    158 	ct->year = regs[MC_YEAR];
    159 }
    160 
    161 /*
    162  * Reset the TODR based on the time value.
    163  */
    164 void
    165 mcclock_set(dev, ct)
    166 	struct device *dev;
    167 	struct clocktime *ct;
    168 {
    169 	struct mcclock_softc *sc = (struct mcclock_softc *)dev;
    170 	mc_todregs regs;
    171 	int s;
    172 
    173 	s = splclock();
    174 	MC146818_GETTOD(sc, &regs);
    175 	splx(s);
    176 
    177 	regs[MC_SEC] = ct->sec;
    178 	regs[MC_MIN] = ct->min;
    179 	regs[MC_HOUR] = ct->hour;
    180 	regs[MC_DOW] = ct->dow;
    181 	regs[MC_DOM] = ct->day;
    182 	regs[MC_MONTH] = ct->mon;
    183 	regs[MC_YEAR] = ct->year;
    184 
    185 	s = splclock();
    186 	MC146818_PUTTOD(sc, &regs);
    187 	splx(s);
    188 }
    189