/*      $NetBSD: clockvar.h,v 1.9 2009/05/12 14:38:26 cegger 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.
*
* 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>

/*
* Definitions 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)(void *, int, int);
       void                    *ca_arg;
};

void    clock_config(device_t, struct clock_attach_args *,
                       struct evcnt *);

/*
* 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 */