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Commit 0fb2a6f2 authored by Eli Billauer's avatar Eli Billauer Committed by Michal Simek
Browse files

microblaze: Added DMA sync operations 



Added support gor dma_direct_sync_single_for_*() and dma_direct_sync_sg_for_*()

Signed-off-by: default avatarEli Billauer <eli.billauer@gmail.com>
Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
parent cf560c18

arch/microblaze/kernel/dma.c

+60 −0
Original line number Diff line number Diff line
@@ -118,6 +118,62 @@ static inline void dma_direct_unmap_page(struct device *dev, 
	__dma_sync(dma_address, size, direction);

}



static inline void

dma_direct_sync_single_for_cpu(struct device *dev,

			       dma_addr_t dma_handle, size_t size,

			       enum dma_data_direction direction)

{

	/*

	 * It's pointless to flush the cache as the memory segment

	 * is given to the CPU

	 */



	if (direction == DMA_FROM_DEVICE)

		__dma_sync(dma_handle, size, direction);

}



static inline void

dma_direct_sync_single_for_device(struct device *dev,

				  dma_addr_t dma_handle, size_t size,

				  enum dma_data_direction direction)

{

	/*

	 * It's pointless to invalidate the cache if the device isn't

	 * supposed to write to the relevant region

	 */



	if (direction == DMA_TO_DEVICE)

		__dma_sync(dma_handle, size, direction);

}



static inline void

dma_direct_sync_sg_for_cpu(struct device *dev,

			   struct scatterlist *sgl, int nents,

			   enum dma_data_direction direction)

{

	struct scatterlist *sg;

	int i;



	/* FIXME this part of code is untested */

	if (direction == DMA_FROM_DEVICE)

		for_each_sg(sgl, sg, nents, i)

			__dma_sync(sg->dma_address, sg->length, direction);

}



static inline void

dma_direct_sync_sg_for_device(struct device *dev,

			      struct scatterlist *sgl, int nents,

			      enum dma_data_direction direction)

{

	struct scatterlist *sg;

	int i;



	/* FIXME this part of code is untested */

	if (direction == DMA_TO_DEVICE)

		for_each_sg(sgl, sg, nents, i)

			__dma_sync(sg->dma_address, sg->length, direction);

}



struct dma_map_ops dma_direct_ops = {

	.alloc_coherent	= dma_direct_alloc_coherent,

	.free_coherent	= dma_direct_free_coherent,
@@ -126,6 +182,10 @@ struct dma_map_ops dma_direct_ops = { 
	.dma_supported	= dma_direct_dma_supported,

	.map_page	= dma_direct_map_page,

	.unmap_page	= dma_direct_unmap_page,

	.sync_single_for_cpu		= dma_direct_sync_single_for_cpu,

	.sync_single_for_device		= dma_direct_sync_single_for_device,

	.sync_sg_for_cpu		= dma_direct_sync_sg_for_cpu,

	.sync_sg_for_device		= dma_direct_sync_sg_for_device,

};

EXPORT_SYMBOL(dma_direct_ops);