sys/arch/acorn26/ioc/latchreg.h

   1 /* $NetBSD: latchreg.h,v 1.1 2002/03/24 15:47:20 bjh21 Exp $ */
   2 /*-
   3  * Copyright (c) 1997, 1998, 2001 Ben Harris
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28 /*
  29  * latchreg.h - Archimedes internal latches
  30  */
  31
  32 #ifndef _LATCHREG_H
  33 #define _LATCHREG_H
  34
  35 /* Register offsets for latches (bus_space units) */
  36
  37 #define LATCH_A         0x10
  38 #define LATCH_B         0x06
  39
  40 /* Latch A controls some of the floppy disc system (all active-low). */
  41 #define LATCHA_NSEL0    0x01    /* Floppy drive 0 select */
  42 #define LATCHA_NSEL1    0x02    /* Floppy drive 1 select */
  43 #define LATCHA_NSEL2    0x04    /* Floppy drive 2 select */
  44 #define LATCHA_NSEL3    0x08    /* Floppy drive 3 select */
  45 #define LATCHA_NSIDE1   0x10    /* Floppy side select. */
  46 #define LATCHA_NMOTORON 0x20    /* Motor on/off */
  47 #define LATCHA_NINUSE   0x40    /* 'In Use' */
  48 /* Bit 7 not used */
  49
  50 /* Latch B does all sorts of random stuff (mostly active-low). */
  51 /* Bit 0 reserved */
  52 #define LATCHB_NDDEN    0x02    /* Floppy disc density setting */
  53 /* Bit 2 reserved */
  54 #define LATCHB_NFDCR    0x08    /* Floppy controller reset */
  55 #define LATCHB_NPSTB    0x10    /* Printer strobe line */
  56 #define LATCHB_AUX1     0x20    /* Spare (VIDC Enhancer?) */
  57 #define LATCHB_AUX2     0x40    /* Spare */
  58 /* Bit 7 not used */
  59
  60 #endif /* !_LATCHREG_H */