Linux Kernel  3.7.1
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dma.h
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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 */