NetBSD/sys/dev/isa/isadmareg.h

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/* $NetBSD: isadmareg.h,v 1.7 2000/02/07 22:07:31 thorpej Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#ifndef _DEV_ISA_ISADMAREG_H_
#define _DEV_ISA_ISADMAREG_H_
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#include <dev/ic/i8237reg.h>
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/*
* By default, ISA DMA controllers can do 64k or 128k transfers, depending
* on the width of the channel being used. However, this may be modified
* by our parent based on bus constraints, etc. Clients of ISA DMA should
* query the ISA DMA to determine the maximum transfer size allowed.
*/
#define ISA_DMA_MAXSIZE_8BIT (64 * 1024)
#define ISA_DMA_MAXSIZE_16BIT (ISA_DMA_MAXSIZE_8BIT * 2)
#define ISA_DMA_MAXSIZE_DEFAULT(chan) \
(((chan) & 4) ? ISA_DMA_MAXSIZE_16BIT : ISA_DMA_MAXSIZE_8BIT)
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/*
* Register definitions for DMA controller 1 (channels 0..3):
*/
#define DMA1_CHN(c) (1*(2*(c))) /* addr reg for channel c */
#define DMA1_SR (1*8) /* status register */
#define DMA1_SMSK (1*10) /* single mask register */
#define DMA1_MODE (1*11) /* mode register */
#define DMA1_FFC (1*12) /* clear first/last FF */
#define DMA1_MASK (1*15) /* mask register */
#define DMA1_IOSIZE (1*16)
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/*
* Register definitions for DMA controller 2 (channels 4..7):
*/
#define DMA2_CHN(c) (2*(2*(c))) /* addr reg for channel c */
#define DMA2_SR (2*8) /* status register */
#define DMA2_SMSK (2*10) /* single mask register */
#define DMA2_MODE (2*11) /* mode register */
#define DMA2_FFC (2*12) /* clear first/last FF */
#define DMA2_MASK (2*15) /* mask register */
#define DMA2_IOSIZE (2*16)
#endif /* _DEV_ISA_ISADMAREG_H_ */