sys/i386/isa/fdreg.h

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      from: @(#)fdreg.h       7.1 (Berkeley) 5/9/91
 *      $Id: fdreg.h,v 1.3 1994/02/07 04:27:10 alm Exp $
 */

/*
 * AT floppy controller registers and bitfields
 */

/* uses NEC765 controller */
#include "../i386/isa/ic/nec765.h"

/* registers */
#define fdout   2       /* Digital Output Register (W) */
#define FDO_FDSEL       0x03    /*  floppy device select */
#define FDO_FRST        0x04    /*  floppy controller reset */
#define FDO_FDMAEN      0x08    /*  enable floppy DMA and Interrupt */
#define FDO_MOEN0       0x10    /*  motor enable drive 0 */
#define FDO_MOEN1       0x20    /*  motor enable drive 1 */
#define FDO_MOEN2       0x30    /*  motor enable drive 2 */
#define FDO_MOEN3       0x40    /*  motor enable drive 3 */

#define fdsts   4       /* NEC 765 Main Status Register (R) */
#define fddata  5       /* NEC 765 Data Register (R/W) */

#define fdctl   7       /* Control Register (W) */
#define FDC_500KBPS     0x00    /* 500KBPS MFM drive transfer rate */
#define FDC_300KBPS     0x01    /* 300KBPS MFM drive transfer rate */
#define FDC_250KBPS     0x02    /* 250KBPS MFM drive transfer rate */
#define FDC_125KBPS     0x03    /* 125KBPS FM drive transfer rate */

#define fdin    7       /* Digital Input Register (R) */
#define FDI_DCHG        0x80    /* diskette has been changed */