Commit f0402a26 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Ingo Molnar
Browse files

generic: add common struct for dma map operations 



This adds struct dma_map_ops include/linux/dma-mapping.h, which, is
used to handle multiple sets of dma mapping API.

Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent d7dff840

include/linux/dma-mapping.h

+48 −0
Original line number Diff line number Diff line
@@ -3,6 +3,8 @@ 


#include <linux/device.h>

#include <linux/err.h>

#include <linux/dma-attrs.h>

#include <linux/scatterlist.h>



/* These definitions mirror those in pci.h, so they can be used

 * interchangeably with their PCI_ counterparts */
@@ -13,6 +15,52 @@ enum dma_data_direction { 
	DMA_NONE = 3,

};



struct dma_map_ops {

	void* (*alloc_coherent)(struct device *dev, size_t size,

				dma_addr_t *dma_handle, gfp_t gfp);

	void (*free_coherent)(struct device *dev, size_t size,

			      void *vaddr, dma_addr_t dma_handle);

	dma_addr_t (*map_page)(struct device *dev, struct page *page,

			       unsigned long offset, size_t size,

			       enum dma_data_direction dir,

			       struct dma_attrs *attrs);

	void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,

			   size_t size, enum dma_data_direction dir,

			   struct dma_attrs *attrs);

	int (*map_sg)(struct device *dev, struct scatterlist *sg,

		      int nents, enum dma_data_direction dir,

		      struct dma_attrs *attrs);

	void (*unmap_sg)(struct device *dev,

			 struct scatterlist *sg, int nents,

			 enum dma_data_direction dir,

			 struct dma_attrs *attrs);

	void (*sync_single_for_cpu)(struct device *dev,

				    dma_addr_t dma_handle, size_t size,

				    enum dma_data_direction dir);

	void (*sync_single_for_device)(struct device *dev,

				       dma_addr_t dma_handle, size_t size,

				       enum dma_data_direction dir);

	void (*sync_single_range_for_cpu)(struct device *dev,

					  dma_addr_t dma_handle,

					  unsigned long offset,

					  size_t size,

					  enum dma_data_direction dir);

	void (*sync_single_range_for_device)(struct device *dev,

					     dma_addr_t dma_handle,

					     unsigned long offset,

					     size_t size,

					     enum dma_data_direction dir);

	void (*sync_sg_for_cpu)(struct device *dev,

				struct scatterlist *sg, int nents,

				enum dma_data_direction dir);

	void (*sync_sg_for_device)(struct device *dev,

				   struct scatterlist *sg, int nents,

				   enum dma_data_direction dir);

	int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);

	int (*dma_supported)(struct device *dev, u64 mask);

	int is_phys;

};



#define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))



/*