microblaze: Implement __dma_sync_page
There is necessary to do some cache handling for dma operations.
Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index 300fea4..64bc39f 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 @@
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 @@
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 = {