sparc: use dma_map_page instead of dma_map_single

This patch converts dma_map_single and dma_unmap_single to use
map_page and unmap_page respectively and removes unnecessary
map_single and unmap_single. map_page can be used to implement
map_single but the opposite is impossible. Having only dma_map_page in
struct dma_ops is enough.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Tested-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 11 deletions

diff --git a/arch/sparc/include/asm/dma-mapping_64.h b/arch/sparc/include/asm/dma-mapping_64.h
index 0c4fb1f81caf..579757e00a25 100644
--- a/arch/sparc/include/asm/dma-mapping_64.h
+++ b/arch/sparc/include/asm/dma-mapping_64.h
@@ -9,12 +9,12 @@ struct dma_ops {
                                 dma_addr_t *dma_handle, gfp_t flag);
         void (*free_coherent)(struct device *dev, size_t size,
                               void *cpu_addr, dma_addr_t dma_handle);
-        dma_addr_t (*map_single)(struct device *dev, void *cpu_addr,
-                                 size_t size,
-                                 enum dma_data_direction direction);
-        void (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
-                             size_t size,
-                             enum dma_data_direction direction);
+        dma_addr_t (*map_page)(struct device *dev, struct page *page,
+                               unsigned long offset, size_t size,
+                               enum dma_data_direction direction);
+        void (*unmap_page)(struct device *dev, dma_addr_t dma_addr,
+                           size_t size,
+                           enum dma_data_direction direction);
         int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents,
                       enum dma_data_direction direction);
         void (*unmap_sg)(struct device *dev, struct scatterlist *sg,
@@ -51,29 +51,30 @@ static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
                                         size_t size,
                                         enum dma_data_direction direction)
 {
-        return dma_ops->map_single(dev, cpu_addr, size, direction);
+        return dma_ops->map_page(dev, virt_to_page(cpu_addr),
+                                 (unsigned long)cpu_addr & ~PAGE_MASK, size,
+                                 direction);
 }
 
 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
                                     size_t size,
                                     enum dma_data_direction direction)
 {
-        dma_ops->unmap_single(dev, dma_addr, size, direction);
+        dma_ops->unmap_page(dev, dma_addr, size, direction);
 }
 
 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
                                       unsigned long offset, size_t size,
                                       enum dma_data_direction direction)
 {
-        return dma_ops->map_single(dev, page_address(page) + offset,
-                                   size, direction);
+        return dma_ops->map_page(dev, page, offset, size, direction);
 }
 
 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
                                   size_t size,
                                   enum dma_data_direction direction)
 {
-        dma_ops->unmap_single(dev, dma_address, size, direction);
+        dma_ops->unmap_page(dev, dma_address, size, direction);
 }
 
 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,