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 */ 16