include/asm-arm/mach/dma.h

   1 /*
   2  * linux/arch/arm/kernel/dma.h
   3  *
   4  * Copyright (C) 1998-2000 Russell King
   5  *
   6  * This header file describes the interface between the generic DMA handler
   7  * (dma.c) and the architecture-specific DMA backends (dma-*.c)
   8  */
   9
  10 struct dma_struct;
  11 typedef struct dma_struct dma_t;
  12
  13 struct dma_ops {
  14         int     (*request)(dmach_t, dma_t *);           /* optional */
  15         void    (*free)(dmach_t, dma_t *);              /* optional */
  16         void    (*enable)(dmach_t, dma_t *);            /* mandatory */
  17         void    (*disable)(dmach_t, dma_t *);           /* mandatory */
  18         int     (*residue)(dmach_t, dma_t *);           /* optional */
  19         int     (*setspeed)(dmach_t, dma_t *, int);     /* optional */
  20         char    *type;
  21 };
  22
  23 struct dma_struct {
  24         struct scatterlist buf;         /* single DMA                   */
  25         int             sgcount;        /* number of DMA SG             */
  26         struct scatterlist *sg;         /* DMA Scatter-Gather List      */
  27
  28         unsigned int    active:1;       /* Transfer active              */
  29         unsigned int    invalid:1;      /* Address/Count changed        */
  30         unsigned int    using_sg:1;     /* using scatter list?          */
  31         dmamode_t       dma_mode;       /* DMA mode                     */
  32         int             speed;          /* DMA speed                    */
  33
  34         unsigned int    lock;           /* Device is allocated          */
  35         const char      *device_id;     /* Device name                  */
  36
  37         unsigned int    dma_base;       /* Controller base address      */
  38         int             dma_irq;        /* Controller IRQ               */
  39         int             state;          /* Controller state             */
  40         struct scatterlist cur_sg;      /* Current controller buffer    */
  41
  42         struct dma_ops  *d_ops;
  43 };
  44
  45 /* Prototype: void arch_dma_init(dma)
  46  * Purpose  : Initialise architecture specific DMA
  47  * Params   : dma - pointer to array of DMA structures
  48  */
  49 void arch_dma_init(dma_t *dma);