/*
 * 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

#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 */