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authorEli Billauer <eli.billauer@gmail.com>2011-09-11 22:43:07 +0300
committerMichal Simek <monstr@monstr.eu>2011-10-14 12:24:30 +0200
commit0fb2a6f283f25731217841f961cefa0a19bd449d (patch)
treeed3712d2ebc0595a13dad5889eb9de8775aa9916
parentcf560c1801e518abfe0951008c4f2df4bbb3f5e8 (diff)
downloadlinux-linaro-stable-0fb2a6f283f25731217841f961cefa0a19bd449d.tar.gz
microblaze: Added DMA sync operations
Added support gor dma_direct_sync_single_for_*() and dma_direct_sync_sg_for_*() Signed-off-by: Eli Billauer <eli.billauer@gmail.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
-rw-r--r--arch/microblaze/kernel/dma.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index 595130bceadd..dc6416d265d6 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c
@@ -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);