Annotation of sys/arch/mvme88k/mvme88k/clock.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: clock.c,v 1.3 2006/04/19 22:09:40 miod Exp $ */
! 2: /*
! 3: * Copyright (c) 1999 Steve Murphree, Jr.
! 4: * Copyright (c) 1995 Theo de Raadt
! 5: *
! 6: * Redistribution and use in source and binary forms, with or without
! 7: * modification, are permitted provided that the following conditions
! 8: * are met:
! 9: * 1. Redistributions of source code must retain the above copyright
! 10: * notice, this list of conditions and the following disclaimer.
! 11: * 2. Redistributions in binary form must reproduce the above copyright
! 12: * notice, this list of conditions and the following disclaimer in the
! 13: * documentation and/or other materials provided with the distribution.
! 14: *
! 15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
! 16: * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
! 17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 18: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
! 19: * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 20: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 21: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 23: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 24: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 25: * SUCH DAMAGE.
! 26: *
! 27: * Copyright (c) 1992, 1993
! 28: * The Regents of the University of California. All rights reserved.
! 29: * Copyright (c) 1995 Nivas Madhur
! 30: * Copyright (c) 1994 Gordon W. Ross
! 31: * Copyright (c) 1993 Adam Glass
! 32: *
! 33: * This software was developed by the Computer Systems Engineering group
! 34: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 35: * contributed to Berkeley.
! 36: *
! 37: * All advertising materials mentioning features or use of this software
! 38: * must display the following acknowledgement:
! 39: * This product includes software developed by the University of
! 40: * California, Lawrence Berkeley Laboratory.
! 41: *
! 42: * Redistribution and use in source and binary forms, with or without
! 43: * modification, are permitted provided that the following conditions
! 44: * are met:
! 45: * 1. Redistributions of source code must retain the above copyright
! 46: * notice, this list of conditions and the following disclaimer.
! 47: * 2. Redistributions in binary form must reproduce the above copyright
! 48: * notice, this list of conditions and the following disclaimer in the
! 49: * documentation and/or other materials provided with the distribution.
! 50: * 3. Neither the name of the University nor the names of its contributors
! 51: * may be used to endorse or promote products derived from this software
! 52: * without specific prior written permission.
! 53: *
! 54: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 55: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 56: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 57: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 58: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 59: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 60: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 61: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 62: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 63: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 64: * SUCH DAMAGE.
! 65: *
! 66: * @(#)clock.c 8.1 (Berkeley) 6/11/93
! 67: */
! 68:
! 69: /*
! 70: * Interval and statistic clocks driver.
! 71: */
! 72:
! 73: #include <sys/param.h>
! 74: #include <sys/kernel.h>
! 75: #include <sys/device.h>
! 76: #include <sys/systm.h>
! 77:
! 78: #include <machine/autoconf.h>
! 79: #include <machine/bus.h>
! 80:
! 81: #include <mvme88k/mvme88k/clockvar.h>
! 82: #include <mvme88k/dev/vme.h>
! 83:
! 84: struct intrhand clock_ih;
! 85: struct intrhand statclock_ih;
! 86:
! 87: /*
! 88: * Statistics clock interval and variance, in usec. Variance must be a
! 89: * power of two. Since this gives us an even number, not an odd number,
! 90: * we discard one case and compensate. That is, a variance of 4096 would
! 91: * give us offsets in [0..4095]. Instead, we take offsets in [1..4095].
! 92: * This is symmetric about the point 2048, or statvar/2, and thus averages
! 93: * to that value (assuming uniform random numbers).
! 94: */
! 95: int statvar = 8192;
! 96: int statmin; /* statclock interval - 1/2*variance */
! 97:
! 98: void
! 99: delay(int us)
! 100: {
! 101: if (brdtyp == BRD_188) {
! 102: extern void m188_delay(int);
! 103:
! 104: m188_delay(us);
! 105: } else {
! 106: /*
! 107: * On MVME187 and MVME197, use the VMEchip for the
! 108: * delay clock.
! 109: */
! 110: *(volatile u_int32_t *)(VME2_BASE + VME2_T1CMP) = 0xffffffff;
! 111: *(volatile u_int32_t *)(VME2_BASE + VME2_T1COUNT) = 0;
! 112: *(volatile u_int32_t *)(VME2_BASE + VME2_TCTL) |=
! 113: VME2_TCTL1_CEN;
! 114:
! 115: while ((*(volatile u_int32_t *)(VME2_BASE + VME2_T1COUNT)) <
! 116: (u_int32_t)us)
! 117: ;
! 118: *(volatile u_int32_t *)(VME2_BASE + VME2_TCTL) &=
! 119: ~VME2_TCTL1_CEN;
! 120: }
! 121: }
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