diff --git a/arch/nios2/include/asm/dma-mapping.h b/arch/nios2/include/asm/dma-mapping.h
index 620c207..5ecc1ed 100644
--- a/arch/nios2/include/asm/dma-mapping.h
+++ b/arch/nios2/include/asm/dma-mapping.h
@@ -14,24 +14,25 @@
  */
 
 #if (DCACHE_SIZE != 0)
-static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
+static inline void *dma_alloc_coherent(size_t len, dma_addr_t *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);
+	if (handle)
+		*handle = ((dma_addr_t)addr + (DCACHE_LINE_SIZE - 1)) &
+			  ~(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)
+static inline void *dma_alloc_coherent(size_t len, dma_addr_t *handle)
 {
 	void *addr = malloc(len);
 	if (!addr)
 		return 0;
-	*handle = (unsigned long)addr;
+	if (handle)
+		*handle = (dma_addr_t)addr;
 	return (void *)(*handle | IO_REGION_BASE);
 }
 #endif
diff --git a/arch/nios2/include/asm/types.h b/arch/nios2/include/asm/types.h
index 1f613d1..21c3415 100644
--- a/arch/nios2/include/asm/types.h
+++ b/arch/nios2/include/asm/types.h
@@ -3,5 +3,7 @@
 
 #include <asm/int-ll64.h>
 
+typedef u32 dma_addr_t;
+
 #endif
 
diff --git a/drivers/net/altera_tse.c b/drivers/net/altera_tse.c
index ecbb9f8..3c49c09 100644
--- a/drivers/net/altera_tse.c
+++ b/drivers/net/altera_tse.c
@@ -520,7 +520,7 @@
 		return PTR_ERR(tx_desc);
 	rx_desc = tx_desc + 2;
 #else
-	tx_desc = dma_alloc_coherent(sizeof(*tx_desc) * (3 + PKTBUFSRX), (unsigned long *)&dma_handle);
+	tx_desc = dma_alloc_coherent(sizeof(*tx_desc) * (3 + PKTBUFSRX), (dma_addr_t *)&dma_handle);
 	rx_desc = tx_desc + 2;
 
 	if (!tx_desc) {