1 /* $NetBSD: dma.h,v 1.2 1995/03/26 07:24:35 leo Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Leo Weppelman. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Leo Weppelman. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef _MACHINE_DMA_H 34 #define _MACHINE_DMA_H 35 36 /* 37 * Atari TT hardware: 38 * FDC/ACSI DMA circuitry 39 */ 40 41 #define DMA ((struct dma *)AD_DMA) 42 43 struct dma { 44 volatile short dma_gap[2]; /* reserved */ 45 volatile short dma_data; /* controller data path */ 46 volatile short dma_mode; /* mode register */ 47 volatile char dma_addr[6]; /* base address H/M/L */ 48 volatile short dma_drvmode; /* floppy density settings */ 49 }; 50 51 #define dma_nsec dma_data /* sector count */ 52 #define dma_stat dma_mode /* status register */ 53 54 /* 55 * Mode register bits 56 */ 57 /* 0x0001 *//* not used */ 58 #define A0 0x0002 /* signal A0 to fdc/hdc */ 59 #define A1 0x0004 /* signal A1 to fdc/hdc */ 60 #define HDC 0x0008 /* must be on if accessing hdc */ 61 #define SCREG 0x0010 /* access sector count register */ 62 /* 0x0020 *//* reserved */ 63 #define NODMA 0x0040 /* no DMA (yet) */ 64 #define FDC 0x0080 /* must be on if accessing fdc */ 65 #define WRBIT 0x0100 /* write to fdc/hdc via dma_data */ 66 67 /* 68 * Status register bits 69 */ 70 #define DMAOK 0x0001 /* something wrong */ 71 #define SCNOT0 0x0002 /* sector count not 0 */ 72 #define DATREQ 0x0004 /* FDC data request signal */ 73 74 /* 75 * Indices into dma_addr. 76 * Access low byte of 16 bits. 77 * Fill low/mid/high in this order. 78 */ 79 #define AD_HIGH 1 80 #define AD_MID 3 81 #define AD_LOW 5 82 83 /* 84 * Defines for 'dmadrv_mode'. 85 */ 86 #define FDC_HDSET 1 /* Set FDC for High density */ 87 #define FDC_HDSIG 2 /* Signal HD present to drive */ 88 #endif /* _MACHINE_DMA_H */ 89