diff options
Diffstat (limited to 'sys/dev/dec/mcclock.c')
| -rw-r--r-- | sys/dev/dec/mcclock.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/sys/dev/dec/mcclock.c b/sys/dev/dec/mcclock.c new file mode 100644 index 0000000..a8a94be --- /dev/null +++ b/sys/dev/dec/mcclock.c @@ -0,0 +1,139 @@ +/* $FreeBSD$ */ +/* $NetBSD: mcclock.c,v 1.11 1998/04/19 07:50:25 jonathan Exp $ */ + +/* + * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. + * All rights reserved. + * + * Author: Chris G. Demetriou + * + * Permission to use, copy, modify and distribute this software and + * its documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND + * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie the + * rights to redistribute these changes. + */ + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/systm.h> +#include <sys/bus.h> + +#include <machine/clockvar.h> +#include <dev/dec/mcclockvar.h> +#include <dev/dec/mc146818reg.h> + +/* + * XXX rate is machine-dependent. + */ +#ifdef __alpha__ +#define MC_DEFAULTRATE MC_RATE_1024_Hz +#endif +#ifdef __pmax__ +#define MC_DEFAULTRATE MC_RATE_256_Hz +#endif + +void +mcclock_attach(device_t dev) +{ + /* Turn interrupts off, just in case. */ + MCCLOCK_WRITE(dev, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); + + clockattach(dev); +} + +void +mcclock_init(device_t dev) +{ + MCCLOCK_WRITE(dev, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE); + MCCLOCK_WRITE(dev, MC_REGB, + MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR); +} + +/* + * Get the time of day, based on the clock's value and/or the base value. + */ +void +mcclock_get(device_t dev, time_t base, struct clocktime *ct) +{ + mc_todregs regs; + int s; + + s = splclock(); + MC146818_GETTOD(dev, ®s) + splx(s); + + ct->sec = regs[MC_SEC]; + ct->min = regs[MC_MIN]; + ct->hour = regs[MC_HOUR]; + ct->dow = regs[MC_DOW]; + ct->day = regs[MC_DOM]; + ct->mon = regs[MC_MONTH]; + ct->year = regs[MC_YEAR]; +} + +/* + * Reset the TODR based on the time value. + */ +void +mcclock_set(device_t dev, struct clocktime *ct) +{ + mc_todregs regs; + int s; + + s = splclock(); + MC146818_GETTOD(dev, ®s); + splx(s); + + regs[MC_SEC] = ct->sec; + regs[MC_MIN] = ct->min; + regs[MC_HOUR] = ct->hour; + regs[MC_DOW] = ct->dow; + regs[MC_DOM] = ct->day; + regs[MC_MONTH] = ct->mon; + regs[MC_YEAR] = ct->year; + + s = splclock(); + MC146818_PUTTOD(dev, ®s); + splx(s); +} + +int +mcclock_getsecs(device_t dev, int *secp) +{ + int timeout = 100000000; + int sec; + int s; + + s = splclock(); + for (;;) { + if (!(MCCLOCK_READ(dev, MC_REGA) & MC_REGA_UIP)) { + sec = MCCLOCK_READ(dev, MC_SEC); + break; + } + if (--timeout == 0) + goto fail; + } + + splx(s); + *secp = sec; + return 0; + + fail: + splx(s); + return ETIMEDOUT; +} |
