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 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the NetBSD
22 * Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 * contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40 #ifndef _DEV_ISA_ISADMAREG_H_
41 #define _DEV_ISA_ISADMAREG_H_
42
43 #include <dev/ic/i8237reg.h>
44
45 /*
46 * By default, ISA DMA controllers can do 64k or 128k transfers, depending
47 * on the width of the channel being used. However, this may be modified
48 * by our parent based on bus constraints, etc. Clients of ISA DMA should
49 * query the ISA DMA to determine the maximum transfer size allowed.
50 */
51 #define ISA_DMA_MAXSIZE_8BIT (64 * 1024)
52 #define ISA_DMA_MAXSIZE_16BIT (ISA_DMA_MAXSIZE_8BIT * 2)
53
54 #define ISA_DMA_MAXSIZE_DEFAULT(chan) \
55 (((chan) & 4) ? ISA_DMA_MAXSIZE_16BIT : ISA_DMA_MAXSIZE_8BIT)
56
57 /*
58 * Register definitions for DMA controller 1 (channels 0..3):
59 */
60 #define DMA1_CHN(c) (1*(2*(c))) /* addr reg for channel c */
61 #define DMA1_SR (1*8) /* status register */
62 #define DMA1_SMSK (1*10) /* single mask register */
63 #define DMA1_MODE (1*11) /* mode register */
64 #define DMA1_FFC (1*12) /* clear first/last FF */
65 #define DMA1_MASK (1*15) /* mask register */
66
67 #define DMA1_IOSIZE (1*16)
68
69 /*
70 * Register definitions for DMA controller 2 (channels 4..7):
71 */
72 #define DMA2_CHN(c) (2*(2*(c))) /* addr reg for channel c */
73 #define DMA2_SR (2*8) /* status register */
74 #define DMA2_SMSK (2*10) /* single mask register */
75 #define DMA2_MODE (2*11) /* mode register */
76 #define DMA2_FFC (2*12) /* clear first/last FF */
77 #define DMA2_MASK (2*15) /* mask register */
78
79 #define DMA2_IOSIZE (2*16)
80
81 #endif /* _DEV_ISA_ISADMAREG_H_ */
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