[PATCH] nios2: Fix DMA functions when CPU has no dcache

[Franck Jullien]

Signed-off-by: Franck Jullien <franck.jullien at gmail.com>
---
 arch/nios2/include/asm/dma-mapping.h |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/arch/nios2/include/asm/dma-mapping.h b/arch/nios2/include/asm/dma-mapping.h
index 9819a97..620c207 100644
--- a/arch/nios2/include/asm/dma-mapping.h
+++ b/arch/nios2/include/asm/dma-mapping.h
@@ -6,7 +6,6 @@
 
 #include <asm/cache.h>
 
-
 /* dma_alloc_coherent() return cache-line aligned allocation which is mapped
  * to uncached io region.
  *
@@ -14,6 +13,7 @@
  *   0x80000000 for nommu, 0xe0000000 for mmu
  */
 
+#if (DCACHE_SIZE != 0)
 static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
 {
 	void *addr = malloc(len + DCACHE_LINE_SIZE);
@@ -25,11 +25,23 @@ static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
 		~(DCACHE_LINE_SIZE - 1) & ~(IO_REGION_BASE);
 	return (void *)(*handle | IO_REGION_BASE);
 }
+#else
+static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
+{
+	void *addr = malloc(len);
+	if (!addr)
+		return 0;
+	*handle = (unsigned long)addr;
+	return (void *)(*handle | IO_REGION_BASE);
+}
+#endif
 
+#if (DCACHE_SIZE != 0)
 #define dma_alloc dma_alloc
 static inline void *dma_alloc(size_t size)
 {
 	return xmemalign(DCACHE_LINE_SIZE, ALIGN(size, DCACHE_LINE_SIZE));
 }
+#endif
 
 #endif /* __ASM_NIOS2_DMA_MAPPING_H */
-- 
1.7.1