MIPS: CPC: provide functions to retrieve register addresses

This patch introduces addr_ functions in addition to the existing read_
& write_ functions. The new functions simply return the address of the
appropriate CPC register rather than performing a memory access. This
will be used in a subsequent patch.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>

arch/mips/include/asm/mips-cpc.h

@@ -73,6 +73,11 @@ static inline bool mips_cpc_present(void)
 
 /* Macros to ease the creation of register access functions */
 #define BUILD_CPC_R_(name, off)					\
+static inline u32 *addr_cpc_##name(void)			\
+{								\
+	return (u32 *)(mips_cpc_base + (off));			\
+}								\
+								\
 static inline u32 read_cpc_##name(void)				\
 {								\
 	return __raw_readl(mips_cpc_base + (off));		\