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isadmareg.h revision 1.7.126.1 
      1 /*	$NetBSD: isadmareg.h,v 1.7.126.1 2008/06/02 13:23:31 mjf 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_ */
     75