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dma.h revision 1.1 
      1  /*	$NetBSD: dma.h,v 1.1 1995/03/26 07:12:07 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