Loading arch/arc/mm/dma.c +45 −0 Original line number Diff line number Diff line Loading @@ -153,6 +153,19 @@ static void _dma_cache_sync(phys_addr_t paddr, size_t size, } } /* * arc_dma_map_page - map a portion of a page for streaming DMA * * 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(). * * Note: while it takes struct page as arg, caller can "abuse" it to pass * a region larger than PAGE_SIZE, provided it is physically contiguous * and this still works correctly */ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, unsigned long attrs) Loading @@ -165,6 +178,24 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page, return plat_phys_to_dma(dev, paddr); } /* * arc_dma_unmap_page - unmap a buffer previously mapped through dma_map_page() * * After this call, reads by the CPU to the buffer are guaranteed to see * whatever the device wrote there. * * Note: historically this routine was not implemented for ARC */ static void arc_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir, unsigned long attrs) { phys_addr_t paddr = plat_dma_to_phys(dev, handle); if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) _dma_cache_sync(paddr, size, dir); } static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs) { Loading @@ -178,6 +209,18 @@ static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg, return nents; } static void arc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs) { struct scatterlist *s; int i; for_each_sg(sg, s, nents, i) arc_dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs); } static void arc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir) { Loading Loading @@ -223,7 +266,9 @@ const struct dma_map_ops arc_dma_ops = { .free = arc_dma_free, .mmap = arc_dma_mmap, .map_page = arc_dma_map_page, .unmap_page = arc_dma_unmap_page, .map_sg = arc_dma_map_sg, .unmap_sg = arc_dma_unmap_sg, .sync_single_for_device = arc_dma_sync_single_for_device, .sync_single_for_cpu = arc_dma_sync_single_for_cpu, .sync_sg_for_cpu = arc_dma_sync_sg_for_cpu, Loading Loading
arch/arc/mm/dma.c +45 −0 Original line number Diff line number Diff line Loading @@ -153,6 +153,19 @@ static void _dma_cache_sync(phys_addr_t paddr, size_t size, } } /* * arc_dma_map_page - map a portion of a page for streaming DMA * * 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(). * * Note: while it takes struct page as arg, caller can "abuse" it to pass * a region larger than PAGE_SIZE, provided it is physically contiguous * and this still works correctly */ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, unsigned long attrs) Loading @@ -165,6 +178,24 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page, return plat_phys_to_dma(dev, paddr); } /* * arc_dma_unmap_page - unmap a buffer previously mapped through dma_map_page() * * After this call, reads by the CPU to the buffer are guaranteed to see * whatever the device wrote there. * * Note: historically this routine was not implemented for ARC */ static void arc_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir, unsigned long attrs) { phys_addr_t paddr = plat_dma_to_phys(dev, handle); if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) _dma_cache_sync(paddr, size, dir); } static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs) { Loading @@ -178,6 +209,18 @@ static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg, return nents; } static void arc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs) { struct scatterlist *s; int i; for_each_sg(sg, s, nents, i) arc_dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs); } static void arc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir) { Loading Loading @@ -223,7 +266,9 @@ const struct dma_map_ops arc_dma_ops = { .free = arc_dma_free, .mmap = arc_dma_mmap, .map_page = arc_dma_map_page, .unmap_page = arc_dma_unmap_page, .map_sg = arc_dma_map_sg, .unmap_sg = arc_dma_unmap_sg, .sync_single_for_device = arc_dma_sync_single_for_device, .sync_single_for_cpu = arc_dma_sync_single_for_cpu, .sync_sg_for_cpu = arc_dma_sync_sg_for_cpu, Loading
Vineet Gupta <vgupta@synopsys.com>Vineet Gupta <vgupta@synopsys.com>