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ARC: dma: implement dma_unmap_page and sg variant
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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1 changed files with 45 additions and 0 deletions
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@ -153,6 +153,19 @@ static void _dma_cache_sync(phys_addr_t paddr, size_t size,
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}
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}
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/*
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* arc_dma_map_page - map a portion of a page for streaming DMA
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*
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* Ensure that any data held in the cache is appropriately discarded
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* or written back.
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*
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* The device owns this memory once this call has completed. The CPU
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* can regain ownership by calling dma_unmap_page().
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*
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* Note: while it takes struct page as arg, caller can "abuse" it to pass
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* a region larger than PAGE_SIZE, provided it is physically contiguous
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* and this still works correctly
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*/
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static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size, enum dma_data_direction dir,
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unsigned long attrs)
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@ -165,6 +178,24 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page,
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return plat_phys_to_dma(dev, paddr);
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}
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/*
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* arc_dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
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*
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* After this call, reads by the CPU to the buffer are guaranteed to see
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* whatever the device wrote there.
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*
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* Note: historically this routine was not implemented for ARC
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*/
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static void arc_dma_unmap_page(struct device *dev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir,
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unsigned long attrs)
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{
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phys_addr_t paddr = plat_dma_to_phys(dev, handle);
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if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
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_dma_cache_sync(paddr, size, dir);
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}
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static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir, unsigned long attrs)
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{
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@ -178,6 +209,18 @@ static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg,
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return nents;
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}
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static void arc_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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unsigned long attrs)
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{
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struct scatterlist *s;
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int i;
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for_each_sg(sg, s, nents, i)
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arc_dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir,
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attrs);
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}
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static void arc_dma_sync_single_for_cpu(struct device *dev,
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dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
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{
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@ -223,7 +266,9 @@ const struct dma_map_ops arc_dma_ops = {
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.free = arc_dma_free,
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.mmap = arc_dma_mmap,
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.map_page = arc_dma_map_page,
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.unmap_page = arc_dma_unmap_page,
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.map_sg = arc_dma_map_sg,
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.unmap_sg = arc_dma_unmap_sg,
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.sync_single_for_device = arc_dma_sync_single_for_device,
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.sync_single_for_cpu = arc_dma_sync_single_for_cpu,
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.sync_sg_for_cpu = arc_dma_sync_sg_for_cpu,
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