1 /* $NetBSD: clockvar.h,v 1.1 2002/02/12 20:38:41 scw Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #ifndef _MVME_CLOCKVAR_H 40 #define _MVME_CLOCKVAR_H 41 42 #include <dev/clock_subr.h> 43 #include <dev/ic/mk48txxreg.h> 44 45 /* 46 * Defintions exported to ASIC-specific clock attachment. 47 */ 48 49 extern struct evcnt clock_profcnt; 50 extern struct evcnt clock_statcnt; 51 52 extern int clock_statvar; 53 extern int clock_statmin; 54 55 struct clock_attach_args { 56 void (*ca_initfunc) __P((void *, int, int)); 57 long (*ca_microtime) __P((void *)); 58 void *ca_arg; 59 }; 60 61 void clock_config __P((struct device *, struct clock_attach_args *, 62 struct evcnt *)); 63 64 void clock_rtc_config __P((todr_chip_handle_t)); 65 66 /* 67 * Macro to compute a new randomized interval. The intervals are 68 * uniformly distributed on [statint - statvar / 2, statint + statvar / 2], 69 * and therefore have mean statint, giving a stathz frequency clock. 70 * 71 * This is gratuitously stolen from sparc/sparc/clock.c 72 */ 73 #define CLOCK_NEWINT(statvar, statmin) ({ \ 74 u_long r, var = (statvar); \ 75 do { r = random() & (var - 1); } while (r == 0); \ 76 (statmin + r); \ 77 }) 78 79 /* 80 * Sun chose the year `68' as their base count, so that 81 * cl_year==0 means 1968. 82 */ 83 #define YEAR0 1968 84 85 /* 86 * interrupt level for clock 87 */ 88 #define CLOCK_LEVEL 5 89 90 #endif /* _MVME_CLOCKVAR_H */ 91