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>
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index 595130b..dc6416d 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c
@@ -118,6 +118,62 @@
__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 @@
.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);