Blackfin arch: dma_memcpy borken for > 64K

Signed-off-by: NAubrey Li <aubrey.li@analog.com>
Signed-off-by: NBryan Wu <bryan.wu@analog.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

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)