1 files changed, 138 insertions, 0 deletions
diff --git a/include/asm-x86_64/dma-mapping.h b/include/asm-x86_64/dma-mapping.h
new file mode 100644
index 000000000000..a416dc31634a
--- /dev/null
+++ b/include/asm-x86_64/dma-mapping.h
@@ -0,0 +1,138 @@
+#ifndef _X8664_DMA_MAPPING_H
+#define _X8664_DMA_MAPPING_H 1
+
+/*
+ * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
+ * documentation.
+ */
+
+#include <linux/config.h>
+
+#include <asm/scatterlist.h>
+#include <asm/io.h>
+#include <asm/swiotlb.h>
+
+extern dma_addr_t bad_dma_address;
+#define dma_mapping_error(x) \
+	(swiotlb ? swiotlb_dma_mapping_error(x) : ((x) == bad_dma_address))
+
+void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
+			 unsigned gfp);
+void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
+			 dma_addr_t dma_handle);
+
+#ifdef CONFIG_GART_IOMMU
+
+extern dma_addr_t dma_map_single(struct device *hwdev, void *ptr, size_t size,
+				 int direction);
+extern void dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
+			     int direction);
+
+#else
+
+/* No IOMMU */
+
+static inline dma_addr_t dma_map_single(struct device *hwdev, void *ptr,
+					size_t size, int direction)
+{
+	dma_addr_t addr;
+
+	if (direction == DMA_NONE)
+		out_of_line_bug();
+	addr = virt_to_bus(ptr);
+
+	if ((addr+size) & ~*hwdev->dma_mask)
+		out_of_line_bug();
+	return addr;
+}
+
+static inline void dma_unmap_single(struct device *hwdev, dma_addr_t dma_addr,
+				    size_t size, int direction)
+{
+	if (direction == DMA_NONE)
+		out_of_line_bug();
+	/* Nothing to do */
+}
+
+#endif
+
+#define dma_map_page(dev,page,offset,size,dir) \
+	dma_map_single((dev), page_address(page)+(offset), (size), (dir))
+
+static inline void dma_sync_single_for_cpu(struct device *hwdev,
+					       dma_addr_t dma_handle,
+					       size_t size, int direction)
+{
+	if (direction == DMA_NONE)
+		out_of_line_bug();
+
+	if (swiotlb)
+		return swiotlb_sync_single_for_cpu(hwdev,dma_handle,size,direction);
+
+	flush_write_buffers();
+}
+
+static inline void dma_sync_single_for_device(struct device *hwdev,
+						  dma_addr_t dma_handle,
+						  size_t size, int direction)
+{
+        if (direction == DMA_NONE)
+		out_of_line_bug();
+
+	if (swiotlb)
+		return swiotlb_sync_single_for_device(hwdev,dma_handle,size,direction);
+
+	flush_write_buffers();
+}
+
+static inline void dma_sync_sg_for_cpu(struct device *hwdev,
+				       struct scatterlist *sg,
+				       int nelems, int direction)
+{
+	if (direction == DMA_NONE)
+		out_of_line_bug();
+
+	if (swiotlb)
+		return swiotlb_sync_sg_for_cpu(hwdev,sg,nelems,direction);
+
+	flush_write_buffers();
+}
+
+static inline void dma_sync_sg_for_device(struct device *hwdev,
+					  struct scatterlist *sg,
+					  int nelems, int direction)
+{
+	if (direction == DMA_NONE)
+		out_of_line_bug();
+
+	if (swiotlb)
+		return swiotlb_sync_sg_for_device(hwdev,sg,nelems,direction);
+
+	flush_write_buffers();
+}
+
+extern int dma_map_sg(struct device *hwdev, struct scatterlist *sg,
+		      int nents, int direction);
+extern void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg,
+			 int nents, int direction);
+
+#define dma_unmap_page dma_unmap_single
+
+extern int dma_supported(struct device *hwdev, u64 mask);
+extern int dma_get_cache_alignment(void);
+#define dma_is_consistent(h) 1
+
+static inline int dma_set_mask(struct device *dev, u64 mask)
+{
+	if (!dev->dma_mask || !dma_supported(dev, mask))
+		return -EIO;
+	*dev->dma_mask = mask;
+	return 0;
+}
+
+static inline void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
+{
+	flush_write_buffers();
+}
+
+#endif