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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Stafford Horne <shorne@gmail.com>

diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c
index ec7fd45704d23ddd99ea2437204476b26bd1914c..47601274abf75ddd8d48f66e227c91921627e3fb 100644 (file)
--- a/arch/openrisc/kernel/dma.c
+++ b/arch/openrisc/kernel/dma.c
@@ -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
 or1k_sync_single_for_device(struct device *dev,
                            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,
        .map_sg = or1k_map_sg,
        .unmap_sg = or1k_unmap_sg,
-       .sync_single_for_cpu = or1k_sync_single_for_cpu,
        .sync_single_for_device = or1k_sync_single_for_device,
 };
 EXPORT_SYMBOL(or1k_dma_map_ops);