File: /usr/src/linux/include/asm-arm/arch-shark/dma.h

1     /*
2      * linux/include/asm-arm/arch-shark/dma.h
3      *
4      * by Alexander Schulz <aschulz@netwinder.org>
5      */
6     #ifndef __ASM_ARCH_DMA_H
7     #define __ASM_ARCH_DMA_H
8     
9     /* Use only the lowest 4MB, nothing else works.
10      * The rest is not DMAable. See dev /  .properties
11      * in OpenFirmware.
12      */
13     #define MAX_DMA_ADDRESS		0xC0400000
14     #define MAX_DMA_CHANNELS	8
15     #define DMA_ISA_CASCADE         4
16     
17     static inline void __arch_adjust_zones(int node, unsigned long *zone_size, unsigned long *zhole_size) 
18     {
19       if (node != 0) return;
20       /* Only the first 4 MB (=1024 Pages) are usable for DMA */
21       zone_size[1] = zone_size[0] - 1024;
22       zone_size[0] = 1024;
23       zhole_size[1] = zhole_size[0];
24       zhole_size[0] = 0;
25     }
26     
27     #define arch_adjust_zones(node,size,holes) __arch_adjust_zones(node,size,holes)
28     
29     #endif /* _ASM_ARCH_DMA_H */
30     
31