The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/isa/fdreg.h

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    1 /*-
    2  * Copyright (c) 1991 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      from: @(#)fdreg.h       7.1 (Berkeley) 5/9/91
   34  * $FreeBSD$
   35  */
   36 
   37 /*
   38  * AT floppy controller registers and bitfields
   39  */
   40 
   41 /* uses NEC765 controller */
   42 #include <isa/ic/nec765.h>
   43 
   44 /* registers */
   45 #define FDOUT   2       /* Digital Output Register (W) */
   46 #define FDO_FDSEL       0x03    /*  floppy device select */
   47 #define FDO_FRST        0x04    /*  floppy controller reset */
   48 #define FDO_FDMAEN      0x08    /*  enable floppy DMA and Interrupt */
   49 #define FDO_MOEN0       0x10    /*  motor enable drive 0 */
   50 #define FDO_MOEN1       0x20    /*  motor enable drive 1 */
   51 #define FDO_MOEN2       0x40    /*  motor enable drive 2 */
   52 #define FDO_MOEN3       0x80    /*  motor enable drive 3 */
   53 
   54 #define FDSTS   4       /* NEC 765 Main Status Register (R) */
   55 #define FDDATA  5       /* NEC 765 Data Register (R/W) */
   56 #define FDCTL   7       /* Control Register (W) */
   57 
   58 #ifndef FDC_500KBPS
   59 #  define       FDC_500KBPS     0x00    /* 500KBPS MFM drive transfer rate */
   60 #  define       FDC_300KBPS     0x01    /* 300KBPS MFM drive transfer rate */
   61 #  define       FDC_250KBPS     0x02    /* 250KBPS MFM drive transfer rate */
   62 #  define       FDC_125KBPS     0x03    /* 125KBPS FM drive transfer rate */
   63                                 /* for some controllers 1MPBS instead */
   64 #endif /* FDC_500KBPS */
   65 
   66 /*
   67  * this is the secret PIO data port (offset from base)
   68  */
   69 #define FDC_YE_DATAPORT 6
   70 
   71 #define FDIN    7       /* Digital Input Register (R) */
   72 #define FDI_DCHG        0x80    /* diskette has been changed */
   73                                 /* requires drive and motor being selected */
   74                                 /* is cleared by any step pulse to drive */

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