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

     /*      $NetBSD: fdreg.h,v 1.4 2003/09/23 21:36:08 mycroft Exp $        */
     
     /*-
      * 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. 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.
     *
     *      @(#)fdreg.h     7.1 (Berkeley) 5/9/91
     */
    
    /*
     * AT floppy controller registers and bitfields
     */
    
    /* uses NEC765 controller */
    #include <dev/ic/nec765reg.h>
    
    /* registers */
    #define fdout   0       /* 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_MOEN(n)     ((1 << n) * 0x10)       /* motor enable */
    
    #define fdsts   2       /* NEC 765 Main Status Register (R) */
    #define FDS_DRVBUSY(n)  ((1 << n) * 0x01)       /* drive busy */
    
    #define fddata  3       /* NEC 765 Data Register (R/W) */
    
    #define fdctl   5       /* 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    5       /* Digital Input Register (R) */
    #define FDI_DCHG        0x80    /* diskette has been changed */
    
    #define FDC_BSIZE       512
    
    /*
     * This constant is a little misleading.  Historically, the floppy
     * controller is located at 0x3f0-0x3f7, but the actual registers
     * are 0x3f2, 0x3f3, 0x3f4, and 0x3f7.  This constant assumes the
     * historic range, but the offsets above reflect the `real' offsets.
     */
    #define FDC_NPORT       8
    
    /*
     * Copyright (C) 1992-1994 by Joerg Wunsch, Dresden
     * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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: FreeBSD: Id: ioctl_fd.h,v 1.7 1994/10/30 19:17:39 joerg Exp 
     */
   
   #define FD_MAX_NSEC 36          /* highest known number of spt - allow for */
                                   /* 2.88 MB drives */
   
   struct ne7_fd_formb {
           int cyl, head;
           int transfer_rate;      /* fdreg.h: FDC_???KBPS */
   
           union {
                   struct fd_form_data {
                           /*
                            * DO NOT CHANGE THE LAYOUT OF THIS STRUCTS
                            * it is hardware-dependant since it exactly
                            * matches the byte sequence to write to FDC
                            * during its `format track' operation
                            */
                           u_char secshift; /* 0 -> 128, ...; usually 2 -> 512 */
                           u_char nsecs;   /* must be <= FD_MAX_NSEC */
                           u_char gaplen;  /* GAP 3 length; usually 84 */
                           u_char fillbyte; /* usually 0xf6 */
                           struct fd_idfield_data {
                                   /*
                                    * data to write into id fields;
                                    * for obscure formats, they mustn't match
                                    * the real values (but mostly do)
                                    */
                                   u_char cylno;   /* 0 thru 79 (or 39) */
                                   u_char headno;  /* 0, or 1 */
                                   u_char secno;   /* starting at 1! */
                                   u_char secsize; /* usually 2 */
                           } idfields[FD_MAX_NSEC]; /* 0 <= idx < nsecs used */
                   } structured;
                   u_char raw[1];  /* to have continuous indexed access */
           } format_info;
   };
   
   /* make life easier */
   # define fd_formb_secshift   format_info.structured.secshift
   # define fd_formb_nsecs      format_info.structured.nsecs
   # define fd_formb_gaplen     format_info.structured.gaplen
   # define fd_formb_fillbyte   format_info.structured.fillbyte
   /* these data must be filled in for(i = 0; i < fd_formb_nsecs; i++) */
   # define fd_formb_cylno(i)   format_info.structured.idfields[i].cylno
   # define fd_formb_headno(i)  format_info.structured.idfields[i].headno
   # define fd_formb_secno(i)   format_info.structured.idfields[i].secno
   # define fd_formb_secsize(i) format_info.structured.idfields[i].secsize

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