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-rw-r--r--arch/blackfin/include/asm/uaccess.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
index 8894e9ffbb57..2f469a1f80fb 100644
--- a/arch/blackfin/include/asm/uaccess.h
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -265,4 +265,26 @@ __clear_user(void *to, unsigned long n)
#define clear_user(to, n) __clear_user(to, n)
+/* How to interpret these return values:
+ * CORE: can be accessed by core load or dma memcpy
+ * CORE_ONLY: can only be accessed by core load
+ * DMA: can only be accessed by dma memcpy
+ * IDMA: can only be accessed by interprocessor dma memcpy (BF561)
+ * ITEST: can be accessed by isram memcpy or dma memcpy
+ */
+enum {
+ BFIN_MEM_ACCESS_CORE = 0,
+ BFIN_MEM_ACCESS_CORE_ONLY,
+ BFIN_MEM_ACCESS_DMA,
+ BFIN_MEM_ACCESS_IDMA,
+ BFIN_MEM_ACCESS_ITEST,
+};
+/**
+ * bfin_mem_access_type() - what kind of memory access is required
+ * @addr: the address to check
+ * @size: number of bytes needed
+ * @return: <0 is error, >=0 is BFIN_MEM_ACCESS_xxx enum (see above)
+ */
+int bfin_mem_access_type(unsigned long addr, unsigned long size);
+
#endif /* _BLACKFIN_UACCESS_H */