microblaze: Implement __dma_sync_page

There is necessary to do some cache handling for dma operations.

Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 23 insertions, 3 deletions

diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index 300fea46737e..64bc39f40ba7 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c
@@ -10,6 +10,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/dma-debug.h>
 #include <asm/bug.h>
+#include <asm/cacheflush.h>
 
 /*
  * Generic direct DMA implementation
@@ -20,6 +21,23 @@
  * default the offset is PCI_DRAM_OFFSET.
  */
 
+static inline void __dma_sync_page(void *vaddr, unsigned long offset,
+                                size_t size, enum dma_data_direction direction)
+{
+        unsigned long start = virt_to_phys(vaddr);
+
+        switch (direction) {
+        case DMA_TO_DEVICE:
+                flush_dcache_range(start + offset, start + offset + size);
+                break;
+        case DMA_FROM_DEVICE:
+                invalidate_dcache_range(start + offset, start + offset + size);
+                break;
+        default:
+                BUG();
+        }
+}
+
 static unsigned long get_dma_direct_offset(struct device *dev)
 {
         if (dev)
@@ -85,11 +103,11 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
                                              struct page *page,
                                              unsigned long offset,
                                              size_t size,
-                                             enum dma_data_direction dir,
+                                             enum dma_data_direction direction,
                                              struct dma_attrs *attrs)
 {
-        BUG_ON(dir == DMA_NONE);
-        __dma_sync_page(page, offset, size, dir);
+        BUG_ON(direction == DMA_NONE);
+        __dma_sync_page(page, offset, size, direction);
         return page_to_phys(page) + offset + get_dma_direct_offset(dev);
 }
 
@@ -99,6 +117,8 @@ static inline void dma_direct_unmap_page(struct device *dev,
                                          enum dma_data_direction direction,
                                          struct dma_attrs *attrs)
 {
+/* There is not necessary to do cache cleanup */
+        /* __dma_sync_page(dma_address, 0 , size, direction); */
 }
 
 struct dma_map_ops dma_direct_ops = {