microblaze: Implement flush_dcache_page macro
flush_dcache_page macro is necessary to implement for
JFFS2 rootfs support on WB system.
Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/include/asm/cacheflush.h b/arch/microblaze/include/asm/cacheflush.h
index a6edd356..e9bb567 100644
--- a/arch/microblaze/include/asm/cacheflush.h
+++ b/arch/microblaze/include/asm/cacheflush.h
@@ -17,6 +17,7 @@
/* Somebody depends on this; sigh... */
#include <linux/mm.h>
+#include <linux/io.h>
/* Look at Documentation/cachetlb.txt */
@@ -60,7 +61,6 @@
#define invalidate_icache() mbc->iin();
#define invalidate_icache_range(start, end) mbc->iinr(start, end);
-
#define flush_icache_user_range(vma, pg, adr, len) flush_icache();
#define flush_icache_page(vma, pg) do { } while (0)
@@ -72,9 +72,15 @@
#define flush_dcache() mbc->dfl();
#define flush_dcache_range(start, end) mbc->dflr(start, end);
-#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
-/* D-cache aliasing problem can't happen - cache is between MMU and ram */
-#define flush_dcache_page(page) do { } while (0)
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
+/* MS: We have to implement it because of rootfs-jffs2 issue on WB */
+#define flush_dcache_page(page) \
+do { \
+ unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
+ addr = (u32)virt_to_phys((void *)addr); \
+ flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
+} while (0);
+
#define flush_dcache_mmap_lock(mapping) do { } while (0)
#define flush_dcache_mmap_unlock(mapping) do { } while (0)