libdma.h

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/*
** libdma.h for lseos in lseos-srv/hw/dma
** 
** Copyright(c)2004 Vianney Rancurel
** Login   <vianney@epita.fr>
** 
** Started on  Wed Mar  3 12:27:20 2004 Vianney Rancurel
** Last update Mon Dec  6 12:23:25 2004 Vianney Rancurel
*/
#ifndef __LIBDMA_H__
#define __LIBDMA_H__    1
#include <libc.h>

#define SYSDMA_REGISTER         1
#define DMAOPT_COPY     (1<<0u)         /* copy buffer          */
#define DMAOPT_READ     (1<<1u)         /* dma read             */
#define DMAOPT_WRITE    (1<<2u)         /* dma write            */

#define SYSDMA_UNREGISTER       2
#define SYSDMA_RESET            3

#define SYSDMA_DUMP             5

/*
 * suberrno codes (advice)
 */
typedef enum
  {
    DMA_REGISTER_BAD_CHANNEL = 100,
    DMA_REGISTER_CHANNEL_NOT_AVAIL,
    DMA_REGISTER_BAD_LEN,
    DMA_REGISTER_NOT_SHARED_RW,
    DMA_REGISTER_BAD_DMA_BLOCK,
    DMA_REGISTER_NOT_DMA_MEM,
  } t_dma_register_suberrno_codes;

/* PROTO libdma.c */
/* libdma.c */
int dma_register(int channel, char *dmabuf, int dmaoff, int dmalen, u_int32_t dmaopt);
int dma_write(int channel, char *buf, int len);
int dma_read(int channel, char *buf, int len);
int dma_unregister(int channel);
int dma_reset(int channel, int dmaoff, int dmalen);
int dma_dump(void);
#endif

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