Blackfin arch: dma_memcpy borken for > 64K

Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 1 deletions

diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c
index 1c344acfd48..0ccb0dc3f83 100644
--- a/arch/blackfin/kernel/bfin_dma_5xx.c
+++ b/arch/blackfin/kernel/bfin_dma_5xx.c
@@ -595,7 +595,7 @@ unsigned short get_dma_curr_ycount(unsigned int channel)
 }
 EXPORT_SYMBOL(get_dma_curr_ycount);
 
-void *dma_memcpy(void *dest, const void *src, size_t size)
+void *_dma_memcpy(void *dest, const void *src, size_t size)
 {
         int direction;  /* 1 - address decrease, 0 - address increase */
         int flag_align; /* 1 - address aligned,  0 - address unaligned */
@@ -734,6 +734,21 @@ void *dma_memcpy(void *dest, const void *src, size_t size)
 
         return dest;
 }
+
+void *dma_memcpy(void *dest, const void *src, size_t size)
+{
+        size_t bulk;
+        size_t rest;
+        void * addr;
+
+        bulk = (size >> 16) << 16;
+        rest = size - bulk;
+        if (bulk)
+                _dma_memcpy(dest, src, bulk);
+        addr = _dma_memcpy(dest+bulk, src+bulk, rest);
+        return addr;
+}
+
 EXPORT_SYMBOL(dma_memcpy);
 
 void *safe_dma_memcpy(void *dest, const void *src, size_t size)