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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */
/* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */
/* All Rights Reserved */
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_PIT_H
#define _SYS_PIT_H
#pragma ident "%Z%%M% %I% %E% SMI"
#ifdef __cplusplus
extern "C" {
#endif
/* Definitions for 8254 Programmable Interrupt Timer ports on AT 386 */
#define PITCTR0_PORT 0x40 /* counter 0 port */
#define PITCTR1_PORT 0x41 /* counter 1 port */
#define PITCTR2_PORT 0x42 /* counter 2 port */
#define PITCTL_PORT 0x43 /* PIT control port */
#define PITAUX_PORT 0x61 /* PIT auxiliary port */
#define SANITY_CTR0 0x48 /* sanity timer counter */
#define SANITY_CTL 0x4B /* sanity control word */
#define SANITY_CHECK 0x461 /* bit 7 set if sanity timer went off */
#define FAILSAFE_NMI 0x80 /* to test if sanity timer went off */
#define ENABLE_SANITY 0x04 /* Enables sanity clock NMI ints */
#define RESET_SANITY 0x00 /* resets sanity NMI interrupt */
/* PIT Status Byte */
#define PITSTAT_OUTPUT 7 /* OUTPUT status bit */
#define PITSTAT_NULLCNT 6 /* NULL COUNT status bit */
/* Definitions for 8254 commands */
#define PIT_READBACK 0xc0 /* read-back command */
#define PIT_READBACKC0 0x02 /* enable read-back for counter 0 */
/* Following are used for Timer 0 */
#define PIT_C0 0x00 /* select counter 0 */
#define PIT_LOADMODE 0x30 /* load least significant byte */
/* followed by most significant byte */
#define PIT_NDIVMODE 0x04 /* divide by N counter */
#define PIT_SQUAREMODE 0x06 /* square-wave mode */
#define PIT_ENDSIGMODE 0x00 /* assert OUT at end-of-count mode */
/* Used for Timer 1. Used for delay calculations in countdown mode */
#define PIT_C1 0x40 /* select counter 1 */
#define PIT_READMODE 0x30 /* read or load least significant */
/* byte followed by most significant */
#define PIT_RATEMODE 0x06 /* square-wave mode for USART */
#define PIT_C2 0x80 /* select counter 2 */
#define SANITY_NUM 0xFFFF /* Sanity timer fires every .2 secs */
/* bits used in auxiliary control port for timer 2 */
#define PITAUX_GATE2 0x01 /* aux port, PIT gate 2 input */
#define PITAUX_OUT2 0x02 /* aux port, PIT clock out 2 enable */
#define PIT_HZ 1193182 /* 8254's cycles per second */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_PIT_H */
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