FreeBSD/Linux Kernel Cross Reference
sys/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
     * $FreeBSD: releng/5.2/sys/isa/fdreg.h 96459 2002-05-12 15:24:21Z joerg $
     */
    
    /*
     * AT floppy controller registers and bitfields
     */
    
    /* uses NEC765 controller */
    #include <dev/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       0x40    /*  motor enable drive 2 */
    #define FDO_MOEN3       0x80    /*  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) */
    
    /*
     * The definitions for FDC_500KBPS etc. have been moved out to <sys/fdcio.h>
     * since they need to be visible in userland.  They cover the lower two bits
     * of FDCTL when used for output.
     */
    /*
     * this is the secret PIO data port (offset from base)
     */
    #define FDC_YE_DATAPORT 6
    
    #define FDIN    7       /* Digital Input Register (R) */
    #define FDI_DCHG        0x80    /* diskette has been changed */
                                    /* requires drive and motor being selected */
                                    /* is cleared by any step pulse to drive */

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