1 /* $FreeBSD: src/sys/dev/dec/mcclock.c,v 1.5.2.2 2001/12/17 14:03:15 gallatin Exp $ */
2 /* $DragonFly: src/sys/dev/misc/dec/Attic/mcclock.c,v 1.4 2004/01/30 05:42:15 dillon Exp $ */
3 /* $NetBSD: mcclock.c,v 1.11 1998/04/19 07:50:25 jonathan Exp $ */
6 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
9 * Author: Chris G. Demetriou
11 * Permission to use, copy, modify and distribute this software and
12 * its documentation is hereby granted, provided that both the copyright
13 * notice and this permission notice appear in all copies of the
14 * software, derivative works or modified versions, and any portions
15 * thereof, and that both notices appear in supporting documentation.
17 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
18 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
19 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
21 * Carnegie Mellon requests users of this software to return to
23 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
24 * School of Computer Science
25 * Carnegie Mellon University
26 * Pittsburgh PA 15213-3890
28 * any improvements or extensions that they make and grant Carnegie the
29 * rights to redistribute these changes.
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/systm.h>
37 #include <machine/clockvar.h>
38 #include "mcclockvar.h"
39 #include "mc146818reg.h"
42 * XXX rate is machine-dependent.
45 #define MC_DEFAULTRATE MC_RATE_1024_Hz
48 #define MC_DEFAULTRATE MC_RATE_256_Hz
52 mcclock_attach(device_t dev)
54 /* Turn interrupts off, just in case. */
55 MCCLOCK_WRITE(dev, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
61 mcclock_init(device_t dev)
63 MCCLOCK_WRITE(dev, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
64 MCCLOCK_WRITE(dev, MC_REGB,
65 MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
69 * Get the time of day, based on the clock's value and/or the base value.
72 mcclock_get(device_t dev, time_t base, struct clocktime *ct)
77 MC146818_GETTOD(dev, ®s)
80 ct->sec = regs[MC_SEC];
81 ct->min = regs[MC_MIN];
82 ct->hour = regs[MC_HOUR];
83 ct->dow = regs[MC_DOW];
84 ct->day = regs[MC_DOM];
85 ct->mon = regs[MC_MONTH];
86 ct->year = regs[MC_YEAR];
90 * Reset the TODR based on the time value.
93 mcclock_set(device_t dev, struct clocktime *ct)
98 MC146818_GETTOD(dev, ®s);
101 regs[MC_SEC] = ct->sec;
102 regs[MC_MIN] = ct->min;
103 regs[MC_HOUR] = ct->hour;
104 regs[MC_DOW] = ct->dow;
105 regs[MC_DOM] = ct->day;
106 regs[MC_MONTH] = ct->mon;
107 regs[MC_YEAR] = ct->year;
110 MC146818_PUTTOD(dev, ®s);
115 mcclock_getsecs(device_t dev, int *secp)
117 int timeout = 100000000;
122 if (!(MCCLOCK_READ(dev, MC_REGA) & MC_REGA_UIP)) {
123 sec = MCCLOCK_READ(dev, MC_SEC);
127 if (--timeout == 0) {