1 /* $NetBSD: mcclock.c,v 1.10 1998/01/12 10:21:04 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@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 1.10 1998/01/12 10:21:04 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 void mcclock_init __P((struct device *)); 44 void mcclock_get __P((struct device *, time_t, struct clocktime *)); 45 void mcclock_set __P((struct device *, struct clocktime *)); 46 47 const struct clockfns mcclock_clockfns = { 48 mcclock_init, mcclock_get, mcclock_set, 49 }; 50 51 #define mc146818_write(dev, reg, datum) \ 52 (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum) 53 #define mc146818_read(dev, reg) \ 54 (*(dev)->sc_busfns->mc_bf_read)(dev, reg) 55 56 void 57 mcclock_attach(sc, busfns) 58 struct mcclock_softc *sc; 59 const struct mcclock_busfns *busfns; 60 { 61 62 printf(": mc146818 or compatible"); 63 64 sc->sc_busfns = busfns; 65 66 /* Turn interrupts off, just in case. */ 67 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); 68 69 clockattach(&sc->sc_dev, &mcclock_clockfns); 70 } 71 72 void 73 mcclock_init(dev) 74 struct device *dev; 75 { 76 struct mcclock_softc *sc = (struct mcclock_softc *)dev; 77 78 mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_RATE_1024_Hz); 79 mc146818_write(sc, MC_REGB, 80 MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR); 81 } 82 83 /* 84 * Get the time of day, based on the clock's value and/or the base value. 85 */ 86 void 87 mcclock_get(dev, base, ct) 88 struct device *dev; 89 time_t base; 90 struct clocktime *ct; 91 { 92 struct mcclock_softc *sc = (struct mcclock_softc *)dev; 93 mc_todregs regs; 94 int s; 95 96 s = splclock(); 97 MC146818_GETTOD(sc, ®s) 98 splx(s); 99 100 ct->sec = regs[MC_SEC]; 101 ct->min = regs[MC_MIN]; 102 ct->hour = regs[MC_HOUR]; 103 ct->dow = regs[MC_DOW]; 104 ct->day = regs[MC_DOM]; 105 ct->mon = regs[MC_MONTH]; 106 ct->year = regs[MC_YEAR]; 107 } 108 109 /* 110 * Reset the TODR based on the time value. 111 */ 112 void 113 mcclock_set(dev, ct) 114 struct device *dev; 115 struct clocktime *ct; 116 { 117 struct mcclock_softc *sc = (struct mcclock_softc *)dev; 118 mc_todregs regs; 119 int s; 120 121 s = splclock(); 122 MC146818_GETTOD(sc, ®s); 123 splx(s); 124 125 regs[MC_SEC] = ct->sec; 126 regs[MC_MIN] = ct->min; 127 regs[MC_HOUR] = ct->hour; 128 regs[MC_DOW] = ct->dow; 129 regs[MC_DOM] = ct->day; 130 regs[MC_MONTH] = ct->mon; 131 regs[MC_YEAR] = ct->year; 132 133 s = splclock(); 134 MC146818_PUTTOD(sc, ®s); 135 splx(s); 136 } 137