sys/dev/isa/isadmareg.h

   1 /*      $NetBSD: isadmareg.h,v 1.7 2000/02/07 22:07:31 thorpej Exp $    */
   2
   3 /*-
   4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
   9  * NASA Ames Research Center.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #ifndef _DEV_ISA_ISADMAREG_H_
  34 #define _DEV_ISA_ISADMAREG_H_
  35
  36 #include <dev/ic/i8237reg.h>
  37
  38 /*
  39  * By default, ISA DMA controllers can do 64k or 128k transfers, depending
  40  * on the width of the channel being used.  However, this may be modified
  41  * by our parent based on bus constraints, etc.  Clients of ISA DMA should
  42  * query the ISA DMA to determine the maximum transfer size allowed.
  43  */
  44 #define ISA_DMA_MAXSIZE_8BIT    (64 * 1024)
  45 #define ISA_DMA_MAXSIZE_16BIT   (ISA_DMA_MAXSIZE_8BIT * 2)
  46
  47 #define ISA_DMA_MAXSIZE_DEFAULT(chan)                                   \
  48         (((chan) & 4) ? ISA_DMA_MAXSIZE_16BIT : ISA_DMA_MAXSIZE_8BIT)
  49
  50 /*
  51  * Register definitions for DMA controller 1 (channels 0..3):
  52  */
  53 #define DMA1_CHN(c)     (1*(2*(c)))             /* addr reg for channel c */
  54 #define DMA1_SR         (1*8)                   /* status register */
  55 #define DMA1_SMSK       (1*10)                  /* single mask register */
  56 #define DMA1_MODE       (1*11)                  /* mode register */
  57 #define DMA1_FFC        (1*12)                  /* clear first/last FF */
  58 #define DMA1_MASK       (1*15)                  /* mask register */
  59
  60 #define DMA1_IOSIZE     (1*16)
  61
  62 /*
  63  * Register definitions for DMA controller 2 (channels 4..7):
  64  */
  65 #define DMA2_CHN(c)     (2*(2*(c)))             /* addr reg for channel c */
  66 #define DMA2_SR         (2*8)                   /* status register */
  67 #define DMA2_SMSK       (2*10)                  /* single mask register */
  68 #define DMA2_MODE       (2*11)                  /* mode register */
  69 #define DMA2_FFC        (2*12)                  /* clear first/last FF */
  70 #define DMA2_MASK       (2*15)                  /* mask register */
  71
  72 #define DMA2_IOSIZE     (2*16)
  73
  74 #endif /* _DEV_ISA_ISADMAREG_H_ */