[PATCH] ppc64: DMA API updates

From: Anton Blanchard <anton@samba.org>

DMA API updates, in particular adding the new cache flush interfaces.

arch/ppc64/kernel/dma.c

@@ -131,27 +131,3 @@ void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 		BUG();
 }
 EXPORT_SYMBOL(dma_unmap_sg);
-
-void dma_sync_single(struct device *dev, dma_addr_t dma_handle, size_t size,
-		enum dma_data_direction direction)
-{
-	if (dev->bus == &pci_bus_type)
-		pci_dma_sync_single(to_pci_dev(dev), dma_handle, size, (int)direction);
-	else if (dev->bus == &vio_bus_type)
-		vio_dma_sync_single(to_vio_dev(dev), dma_handle, size, direction);
-	else
-		BUG();
-}
-EXPORT_SYMBOL(dma_sync_single);
-
-void dma_sync_sg(struct device *dev, struct scatterlist *sg, int nelems,
-		enum dma_data_direction direction)
-{
-	if (dev->bus == &pci_bus_type)
-		pci_dma_sync_sg(to_pci_dev(dev), sg, nelems, (int)direction);
-	else if (dev->bus == &vio_bus_type)
-		vio_dma_sync_sg(to_vio_dev(dev), sg, nelems, direction);
-	else
-		BUG();
-}
-EXPORT_SYMBOL(dma_sync_sg);

include/asm-ppc64/dma-mapping.h

@@ -36,10 +36,43 @@ extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 		enum dma_data_direction direction);
 extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 		int nhwentries, enum dma_data_direction direction);
-extern void dma_sync_single(struct device *dev, dma_addr_t dma_handle,
-		size_t size, enum dma_data_direction direction);
-extern void dma_sync_sg(struct device *dev, struct scatterlist *sg, int nelems,
-		enum dma_data_direction direction);
+
+static inline void
+dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
+			enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	/* nothing to do */
+}
+
+static inline void
+dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
+			   enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	/* nothing to do */
+}
+
+static inline void
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+		    enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	/* nothing to do */
+}
+
+static inline void
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
+		       enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	/* nothing to do */
+}
+
+static inline int dma_mapping_error(dma_addr_t dma_addr)
+{
+	return (dma_addr == DMA_ERROR_CODE);
+}
 
 /* Now for the API extensions over the pci_ one */
 
@@ -56,27 +89,29 @@ dma_get_cache_alignment(void)
 }
 
 static inline void
-dma_sync_single_range(struct device *dev, dma_addr_t dma_handle,
-		      unsigned long offset, size_t size,
-		      enum dma_data_direction direction)
+dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+			      unsigned long offset, size_t size,
+			      enum dma_data_direction direction)
 {
-	/* just sync everything, that's all the pci API can do */
-	dma_sync_single(dev, dma_handle, offset+size, direction);
+	BUG_ON(direction == DMA_NONE);
+	/* nothing to do */
 }
 
 static inline void
-dma_cache_sync(void *vaddr, size_t size,
-	       enum dma_data_direction direction)
+dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
+				 unsigned long offset, size_t size,
+				 enum dma_data_direction direction)
 {
-	/* could define this in terms of the dma_cache ... operations,
-	 * but if you get this on a platform, you should convert the platform
-	 * to using the generic device DMA API */
-	BUG();
+	BUG_ON(direction == DMA_NONE);
+	/* nothing to do */
 }
 
-static inline int dma_mapping_error(dma_addr_t dma_addr)
+static inline void
+dma_cache_sync(void *vaddr, size_t size,
+	       enum dma_data_direction direction)
 {
-	return (dma_addr == DMA_ERROR_CODE);
+	BUG_ON(direction == DMA_NONE);
+	/* nothing to do */
 }
 
 #endif	/* _ASM_DMA_MAPPING_H */

include/asm-ppc64/vio.h

@@ -78,23 +78,10 @@ static inline int vio_dma_supported(struct vio_dev *hwdev, u64 mask)
 		vio_map_single(dev, (page_address(page) + (off)), size, dir)
 #define vio_unmap_page(dev,addr,sz,dir) vio_unmap_single(dev,addr,sz,dir)
 
-
-static inline void vio_dma_sync_single(struct vio_dev *hwdev,
-				       dma_addr_t dma_handle, size_t size,
-				       enum dma_data_direction direction)
-{
-	BUG_ON(direction == DMA_NONE);
-	/* nothing to do */
-}
-
-static inline void vio_dma_sync_sg(struct vio_dev *hwdev,
-				   struct scatterlist *sg, int nelems,
-				   enum dma_data_direction direction)
+static inline int vio_set_dma_mask(struct vio_dev *dev, u64 mask)
 {
-	BUG_ON(direction == DMA_NONE);
-	/* nothing to do */
+	return -EIO;
 }
-static inline int vio_set_dma_mask(struct vio_dev *dev, u64 mask) { return -EIO; }
 
 extern struct bus_type vio_bus_type;