include/asm-generic/dma.h

   1 #ifndef __ASM_GENERIC_DMA_H
   2 #define __ASM_GENERIC_DMA_H
   3 /*
   4  * This file traditionally describes the i8237 PC style DMA controller.
   5  * Most architectures don't have these any more and can get the minimal
   6  * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS.
   7  *
   8  * Some code relies on seeing MAX_DMA_ADDRESS though.
   9  */
  10 #define MAX_DMA_ADDRESS PAGE_OFFSET
  11
  12 extern int request_dma(unsigned int dmanr, const char *device_id);
  13 extern void free_dma(unsigned int dmanr);
  14
  15 #endif /* __ASM_GENERIC_DMA_H */