MIPS: Synchronize dma_map_page and dma_map_single

Synchronize dma_map_page/dma_unmap_page and dma_map_single/dma_unmap_single.
This will reduce unnecessary writebacks and invalidates.

[Ralf: make dma_unmap_page an inline function.]
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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

@@ -24,8 +24,13 @@ extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 	enum dma_data_direction direction);
 extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
 	unsigned long offset, size_t size, enum dma_data_direction direction);
-extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
-	size_t size, enum dma_data_direction direction);
+
+static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
+	size_t size, enum dma_data_direction direction)
+{
+	dma_unmap_single(dev, dma_address, size, direction);
+}
+
 extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 	int nhwentries, enum dma_data_direction direction);
 extern void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,

arch/mips/mm/dma-default.c

@@ -209,7 +209,7 @@ dma_addr_t dma_map_page(struct device *dev, struct page *page,
 		unsigned long addr;
 
 		addr = (unsigned long) page_address(page) + offset;
-		dma_cache_wback_inv(addr, size);
+		__dma_sync(addr, size, direction);
 	}
 
 	return plat_map_dma_mem_page(dev, page) + offset;
@@ -217,23 +217,6 @@ dma_addr_t dma_map_page(struct device *dev, struct page *page,
 
 EXPORT_SYMBOL(dma_map_page);
 
-void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
-	enum dma_data_direction direction)
-{
-	BUG_ON(direction == DMA_NONE);
-
-	if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
-		unsigned long addr;
-
-		addr = dma_addr_to_virt(dma_address);
-		dma_cache_wback_inv(addr, size);
-	}
-
-	plat_unmap_dma_mem(dev, dma_address);
-}
-
-EXPORT_SYMBOL(dma_unmap_page);
-
 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 	enum dma_data_direction direction)
 {