1 /* $NetBSD: dma.h,v 1.8 1996/02/22 10:11:41 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 u_short dma_data; /* controller data path */ 46 volatile u_short dma_mode; /* mode register */ 47 volatile u_char dma_addr[6]; /* base address H/M/L */ 48 volatile u_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 DMA_A0 0x0002 /* signal A0 to fdc/hdc */ 59 #define DMA_A1 0x0004 /* signal A1 to fdc/hdc */ 60 #define DMA_HDC 0x0008 /* must be on if accessing hdc */ 61 #define DMA_SCREG 0x0010 /* access sector count register */ 62 /* 0x0020 *//* reserved */ 63 #define DMA_NODMA 0x0040 /* no DMA (yet) */ 64 #define DMA_FDC 0x0080 /* must be on if accessing fdc */ 65 #define DMA_WRBIT 0x0100 /* write to fdc/hdc via dma_data*/ 66 #define DMA_SCSI 0x0088 /* select 5380 chip */ 67 68 /* 69 * Status register bits 70 */ 71 #define DMAOK 0x0001 /* something wrong */ 72 #define SCNOT0 0x0002 /* sector count not 0 */ 73 #define DATREQ 0x0004 /* FDC data request signal */ 74 75 /* 76 * Indices into dma_addr. 77 * Access low byte of 16 bits. 78 * Fill low/mid/high in this order. 79 */ 80 #define AD_HIGH 1 81 #define AD_MID 3 82 #define AD_LOW 5 83 84 /* 85 * Defines for 'dmadrv_mode'. 86 */ 87 #define FDC_HDSET 1 /* Set FDC for High density */ 88 #define FDC_HDSIG 2 /* Signal HD present to drive */ 89 90 /* 91 * Lock status bits: 92 */ 93 #define DMA_LOCK_REQ 1 /* DMA lock requested */ 94 #define DMA_LOCK_GRANT 2 /* DMA lock granted */ 95 96 #ifdef _KERNEL 97 typedef void (*dma_farg)(void*); 98 99 int st_dmagrab __P((dma_farg, dma_farg, void *, int *, int)); 100 void st_dmafree __P((void *, int *)); 101 int st_dmawanted __P((void)); 102 void st_dmaaddr_set __P((caddr_t)); 103 u_long st_dmaaddr_get __P((void)); 104 void st_dmacomm __P((int, int)); 105 #endif /* _KERNEL */ 106 107 #endif /* _MACHINE_DMA_H */ 108