diff --git a/include/asm-cris/arch-v32/hwregs/reg_rdwr.h b/include/asm-cris/arch-v32/hwregs/reg_rdwr.h
index 44e6023..236f91e 100644
--- a/include/asm-cris/arch-v32/hwregs/reg_rdwr.h
+++ b/include/asm-cris/arch-v32/hwregs/reg_rdwr.h
@@ -1,15 +1,17 @@
-/* $Id: reg_rdwr.h,v 1.6 2005/04/24 18:30:58 starvik Exp $
- *
+/*
  * Read/write register macros used by *_defs.h
  */
 
 #ifndef reg_rdwr_h
 #define reg_rdwr_h
 
+#ifndef REG_READ
+#define REG_READ(type, addr) (*((volatile type *) (addr)))
+#endif
 
-#define REG_READ(type, addr) *((volatile type *) (addr))
-
+#ifndef REG_WRITE
 #define REG_WRITE(type, addr, val) \
    do { *((volatile type *) (addr)) = (val); } while(0)
+#endif
 
 #endif