diff --git a/include/asm-arm/arch-kirkwood/kirkwood.h b/include/asm-arm/arch-kirkwood/kirkwood.h
index 47679dd..2470efb 100644
--- a/include/asm-arm/arch-kirkwood/kirkwood.h
+++ b/include/asm-arm/arch-kirkwood/kirkwood.h
@@ -44,6 +44,7 @@
 #define KW_REG_UNDOC_0x1470		(KW_REGISTER(0x1470))
 #define KW_REG_UNDOC_0x1478		(KW_REGISTER(0x1478))
 
+#define KW_TWSI_BASE			(KW_REGISTER(0x11000))
 #define KW_UART0_BASE			(KW_REGISTER(0x12000))
 #define KW_UART1_BASE			(KW_REGISTER(0x12100))
 #define KW_MPP_BASE			(KW_REGISTER(0x10000))