+#define DMA_31BIT_MASK 0x000000007fffffffULL
+#define DMA_30BIT_MASK 0x000000003fffffffULL
+#define DMA_29BIT_MASK 0x000000001fffffffULL
+#define DMA_28BIT_MASK 0x000000000fffffffULL
+#define DMA_24BIT_MASK 0x0000000000ffffffULL
+
+static inline int valid_dma_direction(int dma_direction)
+{
+ return ((dma_direction == DMA_BIDIRECTIONAL) ||
+ (dma_direction == DMA_TO_DEVICE) ||
+ (dma_direction == DMA_FROM_DEVICE));
+}