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Diffstat (limited to 'arch/metag/include/asm/dma-mapping.h')
| -rw-r--r-- | arch/metag/include/asm/dma-mapping.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/arch/metag/include/asm/dma-mapping.h b/arch/metag/include/asm/dma-mapping.h new file mode 100644 index 00000000000..14b23efd9b7 --- /dev/null +++ b/arch/metag/include/asm/dma-mapping.h @@ -0,0 +1,190 @@ +#ifndef _ASM_METAG_DMA_MAPPING_H +#define _ASM_METAG_DMA_MAPPING_H + +#include <linux/mm.h> + +#include <asm/cache.h> +#include <asm/io.h> +#include <linux/scatterlist.h> +#include <asm/bug.h> + +#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) + +void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flag); + +void dma_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle); + +void dma_sync_for_device(void *vaddr, size_t size, int dma_direction); +void dma_sync_for_cpu(void *vaddr, size_t size, int dma_direction); + +int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size); + +int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size); + +static inline dma_addr_t +dma_map_single(struct device *dev, void *ptr, size_t size, + enum dma_data_direction direction) +{ + BUG_ON(!valid_dma_direction(direction)); + WARN_ON(size == 0); + dma_sync_for_device(ptr, size, direction); + return virt_to_phys(ptr); +} + +static inline void +dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, + enum dma_data_direction direction) +{ + BUG_ON(!valid_dma_direction(direction)); + dma_sync_for_cpu(phys_to_virt(dma_addr), size, direction); +} + +static inline int +dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, + enum dma_data_direction direction) +{ + struct scatterlist *sg; + int i; + + BUG_ON(!valid_dma_direction(direction)); + WARN_ON(nents == 0 || sglist[0].length == 0); + + for_each_sg(sglist, sg, nents, i) { + BUG_ON(!sg_page(sg)); + + sg->dma_address = sg_phys(sg); + dma_sync_for_device(sg_virt(sg), sg->length, direction); + } + + return nents; +} + +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) +{ + BUG_ON(!valid_dma_direction(direction)); + dma_sync_for_device((void *)(page_to_phys(page) + offset), size, + direction); + return page_to_phys(page) + offset; +} + +static inline void +dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, + enum dma_data_direction direction) +{ + BUG_ON(!valid_dma_direction(direction)); + dma_sync_for_cpu(phys_to_virt(dma_address), size, direction); +} + + +static inline void +dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nhwentries, + enum dma_data_direction direction) +{ + struct scatterlist *sg; + int i; + + BUG_ON(!valid_dma_direction(direction)); + WARN_ON(nhwentries == 0 || sglist[0].length == 0); + + for_each_sg(sglist, sg, nhwentries, i) { + BUG_ON(!sg_page(sg)); + + sg->dma_address = sg_phys(sg); + dma_sync_for_cpu(sg_virt(sg), sg->length, direction); + } +} + +static inline void +dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, + enum dma_data_direction direction) +{ + dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction); +} + +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_sync_for_device(phys_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) +{ + dma_sync_for_cpu(phys_to_virt(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) +{ + dma_sync_for_device(phys_to_virt(dma_handle)+offset, size, + direction); +} + +static inline void +dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, + enum dma_data_direction direction) +{ + int i; + for (i = 0; i < nelems; i++, sg++) + dma_sync_for_cpu(sg_virt(sg), sg->length, direction); +} + +static inline void +dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, + enum dma_data_direction direction) +{ + int i; + for (i = 0; i < nelems; i++, sg++) + dma_sync_for_device(sg_virt(sg), sg->length, direction); +} + +static inline int +dma_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + return 0; +} + +#define dma_supported(dev, mask) (1) + +static inline int +dma_set_mask(struct device *dev, u64 mask) +{ + if (!dev->dma_mask || !dma_supported(dev, mask)) + return -EIO; + + *dev->dma_mask = mask; + + return 0; +} + +/* + * dma_alloc_noncoherent() returns non-cacheable memory, so there's no need to + * do any flushing here. + */ +static inline void +dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction) +{ +} + +/* drivers/base/dma-mapping.c */ +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_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s) + +#endif |