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| author | Franck JULLIEN <franck.jullien@gmail.com> | 2011-03-23 22:07:43 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2011-03-30 23:22:35 +0200 |
| commit | ddd06e264a2f26381811d02d160f4aa708035ac3 (patch) | |
| tree | abec20ebbf4aff694895117e0631ec27b74fd45a /arch/nios2/include/asm/dma-mapping.h | |
| parent | 4b4958dbb73e6fb553aaf91d539ff3e22bfe9e40 (diff) | |
| download | barebox-ddd06e264a2f26381811d02d160f4aa708035ac3.tar.gz barebox-ddd06e264a2f26381811d02d160f4aa708035ac3.tar.xz | |
Add Nios2 arch support to barebox
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/nios2/include/asm/dma-mapping.h')
| -rw-r--r-- | arch/nios2/include/asm/dma-mapping.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/dma-mapping.h b/arch/nios2/include/asm/dma-mapping.h new file mode 100644 index 0000000000..49ebf798af --- /dev/null +++ b/arch/nios2/include/asm/dma-mapping.h @@ -0,0 +1,25 @@ +#ifndef __ASM_NIOS2_DMA_MAPPING_H +#define __ASM_NIOS2_DMA_MAPPING_H + +#include <asm/cache.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 + DCACHE_LINE_SIZE); + if (!addr) + return 0; + flush_dcache_range((unsigned long)addr, len + DCACHE_LINE_SIZE); + *handle = ((unsigned long)addr + + (DCACHE_LINE_SIZE - 1)) & + ~(DCACHE_LINE_SIZE - 1) & ~(IO_REGION_BASE); + return (void *)(*handle | IO_REGION_BASE); +} + +#endif /* __ASM_NIOS2_DMA_MAPPING_H */ |