| #ifndef __ASM_AVR32_DMA_MAPPING_H |
| #define __ASM_AVR32_DMA_MAPPING_H |
| |
| #include <linux/mm.h> |
| #include <linux/device.h> |
| #include <linux/scatterlist.h> |
| #include <asm/processor.h> |
| #include <asm/cacheflush.h> |
| #include <asm/io.h> |
| |
| extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
| int direction); |
| |
| /* |
| * Return whether the given device DMA address mask can be supported |
| * properly. For example, if your device can only drive the low 24-bits |
| * during bus mastering, then you would pass 0x00ffffff as the mask |
| * to this function. |
| */ |
| static inline int dma_supported(struct device *dev, u64 mask) |
| { |
| /* Fix when needed. I really don't know of any limitations */ |
| return 1; |
| } |
| |
| static inline int dma_set_mask(struct device *dev, u64 dma_mask) |
| { |
| if (!dev->dma_mask || !dma_supported(dev, dma_mask)) |
| return -EIO; |
| |
| *dev->dma_mask = dma_mask; |
| return 0; |
| } |
| |
| /* |
| * dma_map_single can't fail as it is implemented now. |
| */ |
| static inline int dma_mapping_error(struct device *dev, dma_addr_t addr) |
| { |
| return 0; |
| } |
| |
| /** |
| * dma_alloc_coherent - allocate consistent memory for DMA |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @size: required memory size |
| * @handle: bus-specific DMA address |
| * |
| * Allocate some uncached, unbuffered memory for a device for |
| * performing DMA. This function allocates pages, and will |
| * return the CPU-viewed address, and sets @handle to be the |
| * device-viewed address. |
| */ |
| extern void *dma_alloc_coherent(struct device *dev, size_t size, |
| dma_addr_t *handle, gfp_t gfp); |
| |
| /** |
| * dma_free_coherent - free memory allocated by dma_alloc_coherent |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @size: size of memory originally requested in dma_alloc_coherent |
| * @cpu_addr: CPU-view address returned from dma_alloc_coherent |
| * @handle: device-view address returned from dma_alloc_coherent |
| * |
| * Free (and unmap) a DMA buffer previously allocated by |
| * dma_alloc_coherent(). |
| * |
| * References to memory and mappings associated with cpu_addr/handle |
| * during and after this call executing are illegal. |
| */ |
| extern void dma_free_coherent(struct device *dev, size_t size, |
| void *cpu_addr, dma_addr_t handle); |
| |
| /** |
| * dma_alloc_writecombine - allocate write-combining memory for DMA |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @size: required memory size |
| * @handle: bus-specific DMA address |
| * |
| * Allocate some uncached, buffered memory for a device for |
| * performing DMA. This function allocates pages, and will |
| * return the CPU-viewed address, and sets @handle to be the |
| * device-viewed address. |
| */ |
| extern void *dma_alloc_writecombine(struct device *dev, size_t size, |
| dma_addr_t *handle, gfp_t gfp); |
| |
| /** |
| * dma_free_coherent - free memory allocated by dma_alloc_writecombine |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @size: size of memory originally requested in dma_alloc_writecombine |
| * @cpu_addr: CPU-view address returned from dma_alloc_writecombine |
| * @handle: device-view address returned from dma_alloc_writecombine |
| * |
| * Free (and unmap) a DMA buffer previously allocated by |
| * dma_alloc_writecombine(). |
| * |
| * References to memory and mappings associated with cpu_addr/handle |
| * during and after this call executing are illegal. |
| */ |
| extern void dma_free_writecombine(struct device *dev, size_t size, |
| void *cpu_addr, dma_addr_t handle); |
| |
| /** |
| * dma_map_single - map a single buffer for streaming DMA |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @cpu_addr: CPU direct mapped address of buffer |
| * @size: size of buffer to map |
| * @dir: DMA transfer direction |
| * |
| * Ensure that any data held in the cache is appropriately discarded |
| * or written back. |
| * |
| * The device owns this memory once this call has completed. The CPU |
| * can regain ownership by calling dma_unmap_single() or dma_sync_single(). |
| */ |
| static inline dma_addr_t |
| dma_map_single(struct device *dev, void *cpu_addr, size_t size, |
| enum dma_data_direction direction) |
| { |
| dma_cache_sync(dev, cpu_addr, size, direction); |
| return virt_to_bus(cpu_addr); |
| } |
| |
| /** |
| * dma_unmap_single - unmap a single buffer previously mapped |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @handle: DMA address of buffer |
| * @size: size of buffer to map |
| * @dir: DMA transfer direction |
| * |
| * Unmap a single streaming mode DMA translation. The handle and size |
| * must match what was provided in the previous dma_map_single() call. |
| * All other usages are undefined. |
| * |
| * After this call, reads by the CPU to the buffer are guaranteed 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) |
| { |
| |
| } |
| |
| /** |
| * dma_map_page - map a portion of a page for streaming DMA |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @page: page that buffer resides in |
| * @offset: offset into page for start of buffer |
| * @size: size of buffer to map |
| * @dir: DMA transfer direction |
| * |
| * Ensure that any data held in the cache is appropriately discarded |
| * or written back. |
| * |
| * The device owns this memory once this call has completed. The CPU |
| * can regain ownership by calling dma_unmap_page() or dma_sync_single(). |
| */ |
| static inline dma_addr_t |
| dma_map_page(struct device *dev, struct page *page, |
| unsigned long offset, size_t size, |
| enum dma_data_direction direction) |
| { |
| return dma_map_single(dev, page_address(page) + offset, |
| size, direction); |
| } |
| |
| /** |
| * dma_unmap_page - unmap a buffer previously mapped through dma_map_page() |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @handle: DMA address of buffer |
| * @size: size of buffer to map |
| * @dir: DMA transfer direction |
| * |
| * Unmap a single streaming mode DMA translation. The handle and size |
| * must match what was provided in the previous dma_map_single() call. |
| * All other usages are undefined. |
| * |
| * After this call, reads by the CPU to the buffer are guaranteed to see |
| * whatever the device wrote there. |
| */ |
| static inline void |
| dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, |
| enum dma_data_direction direction) |
| { |
| dma_unmap_single(dev, dma_address, size, direction); |
| } |
| |
| /** |
| * dma_map_sg - map a set of SG buffers for streaming mode DMA |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @sg: list of buffers |
| * @nents: number of buffers to map |
| * @dir: DMA transfer direction |
| * |
| * Map a set of buffers described by scatterlist in streaming |
| * mode for DMA. This is the scatter-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 *sg, int nents, |
| enum dma_data_direction direction) |
| { |
| int i; |
| |
| for (i = 0; i < nents; i++) { |
| char *virt; |
| |
| sg[i].dma_address = page_to_bus(sg_page(&sg[i])) + sg[i].offset; |
| virt = sg_virt(&sg[i]); |
| dma_cache_sync(dev, virt, sg[i].length, direction); |
| } |
| |
| return nents; |
| } |
| |
| /** |
| * dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @sg: list of buffers |
| * @nents: number of buffers to map |
| * @dir: DMA transfer 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. |
| */ |
| static inline void |
| dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, |
| enum dma_data_direction direction) |
| { |
| |
| } |
| |
| /** |
| * dma_sync_single_for_cpu |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @handle: DMA address of buffer |
| * @size: size of buffer to map |
| * @dir: DMA transfer direction |
| * |
| * Make physical memory consistent for a single streaming mode DMA |
| * translation after a transfer. |
| * |
| * If you perform a dma_map_single() but wish to interrogate the |
| * buffer using the cpu, yet do not wish to teardown the DMA mapping, |
| * you must call this function before doing so. At the next point you |
| * give the DMA address back to the card, you must first perform a |
| * dma_sync_single_for_device, and then 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) |
| { |
| /* |
| * No need to do anything since the CPU isn't supposed to |
| * touch this memory after we flushed it at mapping- or |
| * sync-for-device time. |
| */ |
| } |
| |
| static inline void |
| dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, |
| size_t size, enum dma_data_direction direction) |
| { |
| dma_cache_sync(dev, bus_to_virt(dma_handle), size, direction); |
| } |
| |
| static inline void |
| dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| unsigned long offset, size_t size, |
| enum dma_data_direction direction) |
| { |
| /* just sync everything, that's all the pci API can do */ |
| dma_sync_single_for_cpu(dev, dma_handle, offset+size, direction); |
| } |
| |
| static inline void |
| dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, |
| unsigned long offset, size_t size, |
| enum dma_data_direction direction) |
| { |
| /* just sync everything, that's all the pci API can do */ |
| dma_sync_single_for_device(dev, dma_handle, offset+size, direction); |
| } |
| |
| /** |
| * dma_sync_sg_for_cpu |
| * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| * @sg: list of buffers |
| * @nents: number of buffers to map |
| * @dir: DMA transfer direction |
| * |
| * Make physical memory consistent for a set of streaming |
| * mode DMA translations after a transfer. |
| * |
| * The same as dma_sync_single_for_* 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 nents, enum dma_data_direction direction) |
| { |
| /* |
| * No need to do anything since the CPU isn't supposed to |
| * touch this memory after we flushed it at mapping- or |
| * sync-for-device time. |
| */ |
| } |
| |
| static inline void |
| dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
| int nents, enum dma_data_direction direction) |
| { |
| int i; |
| |
| for (i = 0; i < nents; i++) { |
| dma_cache_sync(dev, sg_virt(&sg[i]), sg[i].length, direction); |
| } |
| } |
| |
| /* 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) |
| |
| #endif /* __ASM_AVR32_DMA_MAPPING_H */ |
