sys/arch/arm/iomd/iomd_dma.h

   1 /*      $NetBSD: iomd_dma.h,v 1.2 2002/02/18 11:41:18 bjh21 Exp $       */
   2
   3 /*
   4  * Copyright (c) 1997 Scott Stevens
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by Scott Stevens.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)dmavar.h
  34  */
  35
  36 /*
  37  * dma structures
  38  */
  39
  40 struct dma_ctrl {
  41         int                     dc_flags;
  42         int                     dc_channel;
  43         int                     dc_dmasize;
  44         volatile u_int          *dc_cura;
  45         volatile u_int          *dc_enda;
  46         volatile u_int          *dc_curb;
  47         volatile u_int          *dc_endb;
  48         volatile u_char         *dc_cr;
  49         volatile u_char         *dc_st;
  50
  51         u_char                  *dc_nextaddr;
  52         int                     dc_len;
  53
  54         irqhandler_t            dc_ih;
  55 };
  56
  57 #define DMA_FL_ACTIVE   0x01
  58 #define DMA_FL_READY    0x02
  59
  60 #define DMA_CR_CLEAR    0x80
  61 #define DMA_CR_DIR      0x40
  62 #define DMA_CR_ENABLE   0x20
  63 #define DMA_CR_INC      0x1f
  64
  65 #define DMA_ST_CHAN     0x01
  66 #define DMA_ST_INT      0x02
  67 #define DMA_ST_OVER     0x04
  68 #define DMA_ST_MASK     (DMA_ST_CHAN | DMA_ST_INT | DMA_ST_OVER)
  69
  70 #define DMA_END_STOP    0x80000000
  71 #define DMA_END_LAST    0x40000000
  72
  73 /* Prototypes */
  74 struct dma_ctrl *dma_init(int, int, int, int);
  75 void dma_go(struct dma_ctrl *);
  76 int dma_reset(struct dma_ctrl *);
  77 int dma_setup(struct dma_ctrl *, u_char *, int, int);
  78 int dma_isactive(struct dma_ctrl *);
  79 int dma_isintr(struct dma_ctrl *);
  80 int dma_intr(void *);