diff --git a/arch/arm/mach-s3c6400/include/mach/map.h b/arch/arm/mach-s3c6400/include/mach/map.h
index cff27d813fc6..baf1c0f1ea5a 100644
--- a/arch/arm/mach-s3c6400/include/mach/map.h
+++ b/arch/arm/mach-s3c6400/include/mach/map.h
@@ -52,6 +52,9 @@
 #define S3C64XX_PA_VIC0		(0x71200000)
 #define S3C64XX_PA_VIC1		(0x71300000)
 
+#define S3C64XX_PA_MODEM	(0x74108000)
+#define S3C64XX_VA_MODEM	S3C_ADDR(0x00600000)
+
 /* place VICs close together */
 #define S3C_VA_VIC0		(S3C_VA_IRQ + 0x00)
 #define S3C_VA_VIC1		(S3C_VA_IRQ + 0x10000)
diff --git a/arch/arm/plat-s3c64xx/cpu.c b/arch/arm/plat-s3c64xx/cpu.c
index fbde183a4560..91f49a3a665d 100644
--- a/arch/arm/plat-s3c64xx/cpu.c
+++ b/arch/arm/plat-s3c64xx/cpu.c
@@ -96,6 +96,11 @@ static struct map_desc s3c_iodesc[] __initdata = {
 		.pfn		= __phys_to_pfn(S3C64XX_PA_GPIO),
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C64XX_VA_MODEM,
+		.pfn		= __phys_to_pfn(S3C64XX_PA_MODEM),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
 	},
 };
 
diff --git a/arch/arm/plat-s3c64xx/include/plat/regs-modem.h b/arch/arm/plat-s3c64xx/include/plat/regs-modem.h
new file mode 100644
index 000000000000..49f7759dedfa
--- /dev/null
+++ b/arch/arm/plat-s3c64xx/include/plat/regs-modem.h
@@ -0,0 +1,31 @@
+/* arch/arm/plat-s3c64xx/include/plat/regs-modem.h
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C64XX - modem block registers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#ifndef __PLAT_S3C64XX_REGS_MODEM_H
+#define __PLAT_S3C64XX_REGS_MODEM_H __FILE__
+
+#define S3C64XX_MODEMREG(x)	(S3C64XX_VA_MODEM + (x))
+
+#define S3C64XX_MODEM_INT2AP			S3C64XX_MODEMREG(0x0)
+#define S3C64XX_MODEM_INT2MODEM			S3C64XX_MODEMREG(0x4)
+#define S3C64XX_MODEM_MIFCON			S3C64XX_MODEMREG(0x8)
+#define S3C64XX_MODEM_MIFPCON			S3C64XX_MODEMREG(0xC)
+#define S3C64XX_MODEM_INTCLR			S3C64XX_MODEMREG(0x10)
+#define S3C64XX_MODEM_DMA_TXADDR		S3C64XX_MODEMREG(0x14)
+#define S3C64XX_MODEM_DMA_RXADDR		S3C64XX_MODEMREG(0x18)
+
+#define MIFPCON_INT2M_LEVEL			(1 << 4)
+#define MIFPCON_LCD_BYPASS			(1 << 3)
+
+#endif /* __PLAT_S3C64XX_REGS_MODEM_H */