ARM: imx: refactor the io mapping macro

This makes it more assembler friendly and allows it to be used in situation
that need an unsigned long and not a pointer.  Also the naming is
clearer.  IOMEM is introduced without IMX_ prefix as it is used this way
in more than one ARM subarch and it might become globally available
soon.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/plat-mxc/include/mach/mx21.h b/arch/arm/plat-mxc/include/mach/mx21.h
index 8bc5972..aed0277 100644
--- a/arch/arm/plat-mxc/include/mach/mx21.h
+++ b/arch/arm/plat-mxc/include/mach/mx21.h
@@ -92,10 +92,11 @@
 
 #define MX21_IRAM_BASE_ADDR		0xffffe800	/* internal ram */
 
-#define MX21_IO_ADDRESS(x) (						\
-	IMX_IO_ADDRESS(x, MX21_AIPI) ?:					\
-	IMX_IO_ADDRESS(x, MX21_SAHB1) ?:				\
-	IMX_IO_ADDRESS(x, MX21_X_MEMC))
+#define MX21_IO_P2V(x)	(						\
+	IMX_IO_P2V_MODULE(x, MX21_AIPI) ?:				\
+	IMX_IO_P2V_MODULE(x, MX21_SAHB1) ?:				\
+	IMX_IO_P2V_MODULE(x, MX21_X_MEMC))
+#define MX21_IO_ADDRESS(x)		IOMEM(MX21_IO_P2V(x))
 
 /* fixed interrupt numbers */
 #define MX21_INT_CSPI3		6