/*      $NetBSD: isadmareg.h,v 1.9 2018/05/29 06:14:33 jdolecek 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.
*
* 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_

#include <dev/ic/i8237reg.h>

/*
* 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)

/* DMA Page Address Registers size */
#define DMAPG_IOSIZE    (1*15)

/*
* 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)

/*
* 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_ */