| 1 | /* $NetBSD: isadmareg.h,v 1.8 2008/04/28 20:23:52 martin 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 | |