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: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index ba9114e..d7d090d 100644 (file)
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -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))
 
 /*