summaryrefslogtreecommitdiffstats
path: root/include/asm-blackfin/dma-mapping.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-blackfin/dma-mapping.h')
-rw-r--r--include/asm-blackfin/dma-mapping.h66
1 files changed, 66 insertions, 0 deletions
diff --git a/include/asm-blackfin/dma-mapping.h b/include/asm-blackfin/dma-mapping.h
new file mode 100644
index 00000000000..7a77d7fe3a3
--- /dev/null
+++ b/include/asm-blackfin/dma-mapping.h
@@ -0,0 +1,66 @@
+#ifndef _BLACKFIN_DMA_MAPPING_H
+#define _BLACKFIN_DMA_MAPPING_H
+
+#include <asm/scatterlist.h>
+
+void dma_alloc_init(unsigned long start, unsigned long end);
+void *dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp);
+void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle);
+
+/*
+ * Now for the API extensions over the pci_ one
+ */
+#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
+#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
+
+/*
+ * Map a single buffer of the indicated size for DMA in streaming mode.
+ * The 32-bit bus address to use is returned.
+ *
+ * Once the device is given the dma address, the device owns this memory
+ * until either pci_unmap_single or pci_dma_sync_single is performed.
+ */
+extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
+ enum dma_data_direction direction);
+
+/*
+ * Unmap a single streaming mode DMA translation. The dma_addr and size
+ * must match what was provided for in a previous pci_map_single call. All
+ * other usages are undefined.
+ *
+ * After this call, reads by the cpu to the buffer are guarenteed to see
+ * whatever the device wrote there.
+ */
+extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
+ enum dma_data_direction direction);
+
+/*
+ * Map a set of buffers described by scatterlist in streaming
+ * mode for DMA. This is the scather-gather version of the
+ * above pci_map_single interface. Here the scatter gather list
+ * elements are each tagged with the appropriate dma address
+ * and length. They are obtained via sg_dma_{address,length}(SG).
+ *
+ * NOTE: An implementation may be able to use a smaller number of
+ * DMA address/length pairs than there are SG table elements.
+ * (for example via virtual mapping capabilities)
+ * The routine returns the number of addr/length pairs actually
+ * used, at most nents.
+ *
+ * Device ownership issues as mentioned above for pci_map_single are
+ * the same here.
+ */
+extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction direction);
+
+/*
+ * Unmap a set of streaming mode DMA translations.
+ * Again, cpu read rules concerning calls here are the same as for
+ * pci_unmap_single() above.
+ */
+extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+ int nhwentries, enum dma_data_direction direction);
+
+#endif /* _BLACKFIN_DMA_MAPPING_H */