#include <asm/cache.h>
#include <asm/io.h>
+/*
+ * See Documentation/DMA-API.txt for the description of how the
+ * following DMA API should work.
+ */
+
extern void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, int flag);
#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.
- */
static inline
dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction direction)
return virt_to_bus(ptr);
}
-/*
- * 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.
- */
static inline
void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction)
BUG_ON(direction == DMA_NONE);
}
-/*
- * 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.
- */
static inline
int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
enum dma_data_direction direction)
return nents;
}
-/*
- * Unmap a set of streaming mode DMA translations.
- * Again, cpu read rules concerning calls here are the same as for
- * pci_unmap_single() above.
- */
static inline
void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
enum dma_data_direction direction)
BUG_ON(!valid_dma_direction(direction));
}
-/*
- * pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical
- * to pci_map_single, but takes a struct page instead of a virtual address
- */
static inline
dma_addr_t dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
BUG_ON(direction == DMA_NONE);
}
-/*
- * Make physical memory consistent for a single streaming mode DMA translation
- * after a transfer.
- *
- * If you perform a pci_map_single() but wish to interrogate the buffer using
- * the cpu, yet do not wish to teardown the PCI dma mapping, you must call this
- * function before doing so. At the next point you give the PCI dma address
- * back to the card, the device again owns the buffer.
- */
static inline
void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction direction)
}
-/*
- * Make physical memory consistent for a set of streaming mode DMA translations
- * after a transfer.
- *
- * The same as pci_dma_sync_single but for a scatter-gather list, same rules
- * and usage.
- */
static inline
void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
int nelems, enum dma_data_direction direction)
return 0;
}
-/*
- * Return whether the given PCI device DMA address mask can be supported
- * properly. For example, if your device can only drive the low 24-bits during
- * PCI bus mastering, then you would pass 0x00ffffff as the mask to this
- * function.
- */
static inline
int dma_supported(struct device *dev, u64 mask)
{
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