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nios2: add dma_alloc_coherent 

This function return cache-line aligned allocation which is mapped
to uncached io region.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
This commit is contained in:
Thomas Chou 2010-04-17 23:34:40 +08:00 committed by Scott McNutt
parent 0dc1c7f692
commit 7e812f2e9c
1 changed files with 23 additions and 0 deletions
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23
arch/nios2/include/asm/dma-mapping.h Normal file
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#ifndef __ASM_NIOS2_DMA_MAPPING_H
#define __ASM_NIOS2_DMA_MAPPING_H
/* dma_alloc_coherent() return cache-line aligned allocation which is mapped
* to uncached io region.
*
* IO_REGION_BASE should be defined in board config header file
* 0x80000000 for nommu, 0xe0000000 for mmu
*/
static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
{
void *addr = malloc(len + CONFIG_SYS_DCACHELINE_SIZE);
if (!addr)
return 0;
flush_dcache((unsigned long)addr, len + CONFIG_SYS_DCACHELINE_SIZE);
*handle = ((unsigned long)addr +
(CONFIG_SYS_DCACHELINE_SIZE - 1)) &
~(CONFIG_SYS_DCACHELINE_SIZE - 1) & ~(IO_REGION_BASE);
return (void *)(*handle | IO_REGION_BASE);
}
#endif /* __ASM_NIOS2_DMA_MAPPING_H */