| #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) | |
| /* drivers/base/dma-mapping.c */ | |
| extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, | |
| void *cpu_addr, dma_addr_t dma_addr, size_t size); | |
| extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, | |
| void *cpu_addr, dma_addr_t dma_addr, | |
| size_t size); | |
| #define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s) | |
| #define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s) | |
| #endif /* __ASM_AVR32_DMA_MAPPING_H */ |