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/dev/isa/fdreg.h

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    1 /*      $OpenBSD: fdreg.h,v 1.12 2006/08/13 03:36:24 krw Exp $  */
    2 /*      $NetBSD: fdreg.h,v 1.8 1995/06/28 04:30:57 cgd Exp $    */
    3 
    4 /*-
    5  * Copyright (c) 1991 The Regents of the University of California.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)fdreg.h     7.1 (Berkeley) 5/9/91
   33  */
   34 
   35 /*
   36  * AT floppy controller registers and bitfields
   37  */
   38 
   39 /* uses NEC765 controller */
   40 #include <dev/ic/nec765reg.h>
   41 
   42 /* registers */
   43 #define fdout   2       /* Digital Output Register (W) */
   44 #define FDO_FDSEL       0x03    /*  floppy device select */
   45 #define FDO_FRST        0x04    /*  floppy controller reset */
   46 #define FDO_FDMAEN      0x08    /*  enable floppy DMA and Interrupt */
   47 #define FDO_MOEN(n)     ((1 << n) * 0x10)       /* motor enable */
   48 
   49 #define fdsts   4       /* NEC 765 Main Status Register (R) */
   50 #define fddata  5       /* NEC 765 Data Register (R/W) */
   51 
   52 #define FDCTL_OFFSET    7       /* Offset from the other registers. */
   53 #define fdctl   0       /* Control Register (W) */
   54 #define FDC_500KBPS     0x00    /* 500KBPS MFM drive transfer rate */
   55 #define FDC_300KBPS     0x01    /* 300KBPS MFM drive transfer rate */
   56 #define FDC_250KBPS     0x02    /* 250KBPS MFM drive transfer rate */
   57 #define FDC_125KBPS     0x03    /* 125KBPS FM drive transfer rate */
   58 
   59 #define fdin    0       /* Digital Input Register (R) */
   60 #define FDI_DCHG        0x80    /* diskette has been changed */
   61 
   62 #define FDC_NPORT       6
   63 #define FDCTL_NPORT     1
   64 #define FDC_MAXIOSIZE   NBPG    /* XXX should be MAXBSIZE */
   65 #define FD_BSIZE(fd)    (128 << fd->sc_type->secsize)
   66 
   67 #define FDUNIT(dev)     ((dev & 0x80) >> 7)     /* XXX two drives max, sorry */
   68 #define FDTYPE(dev)     ((minor(dev) & 0x70) >> 4)
   69 #define FDPART(dev)     (minor(dev) & 0x0f)

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