arch/nios2/include/asm/dma-mapping.h

   1 #ifndef __ASM_NIOS2_DMA_MAPPING_H
   2 #define __ASM_NIOS2_DMA_MAPPING_H
   3
   4 #include <memalign.h>
   5 #include <asm/io.h>
   6
   7 /*
   8  * dma_alloc_coherent() return cache-line aligned allocation which is mapped
   9  * to uncached io region.
  10  */
  11 static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
  12 {
  13         unsigned long addr = (unsigned long)malloc_cache_aligned(len);
  14
  15         if (!addr)
  16                 return NULL;
  17
  18         invalidate_dcache_range(addr, addr + len);
  19         if (handle)
  20                 *handle = addr;
  21
  22         return ioremap(addr, len);
  23 }
  24 #endif /* __ASM_NIOS2_DMA_MAPPING_H */