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      1 /*	$NetBSD: dma.h,v 1.12 2017/10/07 16:05:31 jdolecek 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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef _MACHINE_DMA_H
     29 #define _MACHINE_DMA_H
     30 
     31 /*
     32  * Atari TT hardware:
     33  * FDC/ACSI DMA circuitry
     34  */
     35 
     36 #define	DMA	((struct dma *)AD_DMA)
     37 
     38 struct dma {
     39 	volatile short	  dma_gap[2];	/* reserved			*/
     40 	volatile u_short  dma_data;	/* controller data path		*/
     41 	volatile u_short  dma_mode;	/* mode register		*/
     42 	volatile u_char   dma_addr[6];	/* base address H/M/L		*/
     43 	volatile u_short  dma_drvmode;	/* floppy density settings	*/
     44 };
     45 
     46 #define	dma_nsec      dma_data		/* sector count			*/
     47 #define	dma_stat      dma_mode		/* status register		*/
     48 
     49 /*
     50  * Mode register bits
     51  */
     52 /*			0x0001		*//* not used			*/
     53 #define	DMA_A0		0x0002		/* signal A0 to fdc/hdc		*/
     54 #define	DMA_A1		0x0004		/* signal A1 to fdc/hdc		*/
     55 #define	DMA_HDC		0x0008		/* must be on if accessing hdc	*/
     56 #define	DMA_SCREG	0x0010		/* access sector count register	*/
     57 /*			0x0020		*//* reserved			*/
     58 #define	DMA_NODMA	0x0040		/* no DMA (yet)			*/
     59 #define	DMA_FDC		0x0080		/* must be on if accessing fdc	*/
     60 #define	DMA_WRBIT	0x0100		/* write to fdc/hdc via dma_data*/
     61 #define	DMA_SCSI	0x0088		/* select 5380 chip		*/
     62 
     63 /*
     64  * Status register bits
     65  */
     66 #define	DMAOK	0x0001		/* something wrong			*/
     67 #define	SCNOT0	0x0002		/* sector count not 0			*/
     68 #define	DATREQ	0x0004		/* FDC data request signal		*/
     69 
     70 /*
     71  * Indices into dma_addr.
     72  * Access low byte of 16 bits.
     73  * Fill low/mid/high in this order.
     74  */
     75 #define	AD_HIGH	1
     76 #define	AD_MID	3
     77 #define	AD_LOW	5
     78 
     79 /*
     80  * Defines for 'dmadrv_mode'.
     81  */
     82 #define	FDC_HDSET	1	/* Set FDC for High density		*/
     83 #define	FDC_HDSIG	2	/* Signal HD present to drive		*/
     84 
     85 /*
     86  * Lock status bits:
     87  */
     88 #define	DMA_LOCK_REQ	1	/* DMA lock requested			*/
     89 #define	DMA_LOCK_GRANT	2	/* DMA lock granted			*/
     90 
     91 #ifdef _KERNEL
     92 typedef void (*dma_farg)(void*);
     93 
     94 int	st_dmagrab(dma_farg, dma_farg, void *, int *, int, kmutex_t *);
     95 void	st_dmafree(void *, int *);
     96 int	st_dmawanted(void);
     97 void	st_dmaaddr_set(void *);
     98 u_long	st_dmaaddr_get(void);
     99 void	st_dmacomm(int, int);
    100 #endif /* _KERNEL	*/
    101 
    102 #endif /* _MACHINE_DMA_H */
    103