NetBSD/sys/dev/mvme/clockvar.h

91 lines
3.1 KiB
C

/* $NetBSD: clockvar.h,v 1.1 2002/02/12 20:38:41 scw Exp $ */
/*-
* Copyright (c) 1996, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MVME_CLOCKVAR_H
#define _MVME_CLOCKVAR_H
#include <dev/clock_subr.h>
#include <dev/ic/mk48txxreg.h>
/*
* Defintions exported to ASIC-specific clock attachment.
*/
extern struct evcnt clock_profcnt;
extern struct evcnt clock_statcnt;
extern int clock_statvar;
extern int clock_statmin;
struct clock_attach_args {
void (*ca_initfunc) __P((void *, int, int));
long (*ca_microtime) __P((void *));
void *ca_arg;
};
void clock_config __P((struct device *, struct clock_attach_args *,
struct evcnt *));
void clock_rtc_config __P((todr_chip_handle_t));
/*
* Macro to compute a new randomized interval. The intervals are
* uniformly distributed on [statint - statvar / 2, statint + statvar / 2],
* and therefore have mean statint, giving a stathz frequency clock.
*
* This is gratuitously stolen from sparc/sparc/clock.c
*/
#define CLOCK_NEWINT(statvar, statmin) ({ \
u_long r, var = (statvar); \
do { r = random() & (var - 1); } while (r == 0); \
(statmin + r); \
})
/*
* Sun chose the year `68' as their base count, so that
* cl_year==0 means 1968.
*/
#define YEAR0 1968
/*
* interrupt level for clock
*/
#define CLOCK_LEVEL 5
#endif /* _MVME_CLOCKVAR_H */