| #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,(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 */ |
