1 /* $NetBSD: mcclock.c,v 1.12 1999/01/15 23:29:55 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 1.12 1999/01/15 23:29:55 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 /* 44 * XXX rate is machine-dependent. 45 */ 46 #ifdef __alpha__ 47 #define MC_DFEAULTRATE MC_RATE_1024_Hz 48 #endif 49 #ifdef pmax 50 #define MC_DEFAULTRATE MC_RATE_256_Hz 51 #endif 52 53 54 void mcclock_init __P((struct device *)); 55 void mcclock_get __P((struct device *, time_t, struct clocktime *)); 56 void mcclock_set __P((struct device *, struct clocktime *)); 57 58 const struct clockfns mcclock_clockfns = { 59 mcclock_init, mcclock_get, mcclock_set, 60 }; 61 62 #define mc146818_write(dev, reg, datum) \ 63 (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum) 64 #define mc146818_read(dev, reg) \ 65 (*(dev)->sc_busfns->mc_bf_read)(dev, reg) 66 67 void 68 mcclock_attach(sc, busfns) 69 struct mcclock_softc *sc; 70 const struct mcclock_busfns *busfns; 71 { 72 73 printf(": mc146818 or compatible"); 74 75 sc->sc_busfns = busfns; 76 77 /* Turn interrupts off, just in case. */ 78 mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); 79 80 clockattach(&sc->sc_dev, &mcclock_clockfns); 81 } 82 83 void 84 mcclock_init(dev) 85 struct device *dev; 86 { 87 struct mcclock_softc *sc = (struct mcclock_softc *)dev; 88 89 mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE); 90 mc146818_write(sc, MC_REGB, 91 MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR); 92 } 93 94 /* 95 * Get the time of day, based on the clock's value and/or the base value. 96 */ 97 void 98 mcclock_get(dev, base, ct) 99 struct device *dev; 100 time_t base; 101 struct clocktime *ct; 102 { 103 struct mcclock_softc *sc = (struct mcclock_softc *)dev; 104 mc_todregs regs; 105 int s; 106 107 s = splclock(); 108 MC146818_GETTOD(sc, ®s) 109 splx(s); 110 111 ct->sec = regs[MC_SEC]; 112 ct->min = regs[MC_MIN]; 113 ct->hour = regs[MC_HOUR]; 114 ct->dow = regs[MC_DOW]; 115 ct->day = regs[MC_DOM]; 116 ct->mon = regs[MC_MONTH]; 117 ct->year = regs[MC_YEAR]; 118 } 119 120 /* 121 * Reset the TODR based on the time value. 122 */ 123 void 124 mcclock_set(dev, ct) 125 struct device *dev; 126 struct clocktime *ct; 127 { 128 struct mcclock_softc *sc = (struct mcclock_softc *)dev; 129 mc_todregs regs; 130 int s; 131 132 s = splclock(); 133 MC146818_GETTOD(sc, ®s); 134 splx(s); 135 136 regs[MC_SEC] = ct->sec; 137 regs[MC_MIN] = ct->min; 138 regs[MC_HOUR] = ct->hour; 139 regs[MC_DOW] = ct->dow; 140 regs[MC_DOM] = ct->day; 141 regs[MC_MONTH] = ct->mon; 142 regs[MC_YEAR] = ct->year; 143 144 s = splclock(); 145 MC146818_PUTTOD(sc, ®s); 146 splx(s); 147 } 148