sys/arch/atari/include/dma.h

   1 /*      $NetBSD: dma.h,v 1.10 2009/03/05 13:00:45 tsutsui 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);
  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 */