Annotation of sys/arch/sparc64/sparc64/timerreg.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: timerreg.h,v 1.5 2007/05/29 09:54:23 sobrado Exp $ */
! 2: /* $NetBSD: timerreg.h,v 1.3 1999/06/05 05:10:01 mrg Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1992, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * This software was developed by the Computer Systems Engineering group
! 9: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 10: * contributed to Berkeley.
! 11: *
! 12: * All advertising materials mentioning features or use of this software
! 13: * must display the following acknowledgement:
! 14: * This product includes software developed by the University of
! 15: * California, Lawrence Berkeley Laboratory.
! 16: *
! 17: * Redistribution and use in source and binary forms, with or without
! 18: * modification, are permitted provided that the following conditions
! 19: * are met:
! 20: * 1. Redistributions of source code must retain the above copyright
! 21: * notice, this list of conditions and the following disclaimer.
! 22: * 2. Redistributions in binary form must reproduce the above copyright
! 23: * notice, this list of conditions and the following disclaimer in the
! 24: * documentation and/or other materials provided with the distribution.
! 25: * 3. Neither the name of the University nor the names of its contributors
! 26: * may be used to endorse or promote products derived from this software
! 27: * without specific prior written permission.
! 28: *
! 29: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 30: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 31: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 32: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 33: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 34: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 35: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 36: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 37: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 38: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 39: * SUCH DAMAGE.
! 40: *
! 41: * @(#)timerreg.h 8.1 (Berkeley) 6/11/93
! 42: */
! 43:
! 44: /*
! 45: * These timers work in a rather peculiar fashion. Most clock counters
! 46: * run to 0 (as, e.g., on the VAX, where the ICR counts up to 0 from a
! 47: * large unsigned number). On the Sun-4c, it counts up to a limit. But
! 48: * for some reason, when it reaches the limit, it resets to 1, not 0.
! 49: * Thus, if the limit is set to 4, the counter counts like this:
! 50: *
! 51: * 1, 2, 3, 1, 2, 3, ...
! 52: *
! 53: * and if we want to divide by N we must set the limit register to N+1.
! 54: *
! 55: * Sun-4u counters/timer are similar but:
! 56: *
! 57: * - the registers have been shuffled around once again. We need
! 58: * to use offsets from the 3 addresses the ROM provides us.
! 59: * - The counters are 29 bits wide with 1us accuracy.
! 60: * - You can make them do funky things with the limit register
! 61: * - They have standard 64-bit SBus control registers.
! 62: *
! 63: * There is a problem on the Ultra5 and Ultra10. As the PCI controller
! 64: * doesn't include the timer, there are no `counter-timer' nodes here
! 65: * and so we must use %tick.
! 66: */
! 67: #ifndef _LOCORE
! 68: struct timer_4u {
! 69: volatile int64_t t_count; /* counter reg */
! 70: volatile int64_t t_limit; /* limit reg */
! 71:
! 72: #define TMR_LIM_IEN 0x80000000 /* interrupt enable bit */
! 73: #define TMR_LIM_RELOAD 0x40000000 /* reload counter to 0 */
! 74: #define TMR_LIM_PERIODIC 0x20000000 /* reset at limit */
! 75: #define TMR_LIM_MASK 0x1fffffff
! 76: };
! 77:
! 78: struct timerreg_4u {
! 79: struct timer_4u *t_timer; /* There are two of them. */
! 80: volatile int64_t *t_clrintr; /* There are two of these. */
! 81: volatile int64_t *t_mapintr; /* Same here. */
! 82: };
! 83:
! 84: #endif /* _LOCORE */
! 85:
! 86: /* Compute a limit that causes the timer to fire every n microseconds. */
! 87: #define tmr_ustolim(n) (((n) - 1) & TMR_LIM_MASK)
CVSweb