Right now we only have the dma_sync_single_* functions, but no functions
for actually mapping a pointer. The mapping functions become necessary
when casting a pointer to unsigned long to get a dma address is not
enough. (I'm not even going so far that we'll add IOMMU support, but on
some architectures we need a place where we can check if a pointer is
DMA mappable at all)
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
include/dma.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/dma.h b/include/dma.h
index 29d94c0a52..5fdcb1733c 100644
--- a/include/dma.h
+++ b/include/dma.h
@@ -30,6 +30,18 @@ static inline void dma_free(void *mem)
}
#endif
+dma_addr_t dma_map_single(struct device_d *dev, void *ptr, size_t size,
+ enum dma_data_direction dir);
+void dma_unmap_single(struct device_d *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir);
+
+#define DMA_ERROR_CODE (~(dma_addr_t)0)
+
+static inline int dma_mapping_error(struct device_d *dev, dma_addr_t dma_addr)
+{
+ return dma_addr == DMA_ERROR_CODE;
+}
+
/* streaming DMA - implement the below calls to support HAS_DMA */
void dma_sync_single_for_cpu(dma_addr_t address, size_t size,
enum dma_data_direction dir);
--
2.16.1
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