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Commit 1902cbcc authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Stafford Horne
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openrisc: remove the sync_single_for_cpu DMA operation 



openrisc does all the required cache maintainance at dma map time, and none
at unmap time.  It thus has to implement sync_single_for_device to match
the map cace for buffer reuse, but there is no point in doing another
invalidation in the sync_single_cpu_case, which in terms of cache
maintainance is equivalent to the unmap case.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarStafford Horne <shorne@gmail.com>
parent 1e4b044d

arch/openrisc/kernel/dma.c

+0 −15
Original line number Original line Diff line number Diff line
@@ -208,20 +208,6 @@ or1k_unmap_sg(struct device *dev, struct scatterlist *sg, 
	}

	}

}

}





static void

or1k_sync_single_for_cpu(struct device *dev,

			 dma_addr_t dma_handle, size_t size,

			 enum dma_data_direction dir)

{

	unsigned long cl;

	dma_addr_t addr = dma_handle;

	struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];



	/* Invalidate the dcache for the requested range */

	for (cl = addr; cl < addr + size; cl += cpuinfo->dcache_block_size)

		mtspr(SPR_DCBIR, cl);

}



static void

static void

or1k_sync_single_for_device(struct device *dev,

or1k_sync_single_for_device(struct device *dev,

			    dma_addr_t dma_handle, size_t size,

			    dma_addr_t dma_handle, size_t size,
@@ -243,7 +229,6 @@ const struct dma_map_ops or1k_dma_map_ops = { 
	.unmap_page = or1k_unmap_page,

	.unmap_page = or1k_unmap_page,

	.map_sg = or1k_map_sg,

	.map_sg = or1k_map_sg,

	.unmap_sg = or1k_unmap_sg,

	.unmap_sg = or1k_unmap_sg,

	.sync_single_for_cpu = or1k_sync_single_for_cpu,

	.sync_single_for_device = or1k_sync_single_for_device,

	.sync_single_for_device = or1k_sync_single_for_device,

};

};

EXPORT_SYMBOL(or1k_dma_map_ops);
 
EXPORT_SYMBOL(or1k_dma_map_ops);