diff --git a/arch/arm/plat-s5p/dev-uart.c b/arch/arm/plat-s5p/dev-uart.c
index a89331e..6a73428 100644
--- a/arch/arm/plat-s5p/dev-uart.c
+++ b/arch/arm/plat-s5p/dev-uart.c
@@ -119,6 +119,56 @@
 #endif
 };
 
+static struct resource s5p_uart4_resource[] = {
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 4
+	[0] = {
+		.start	= S5P_PA_UART4,
+		.end	= S5P_PA_UART4 + S5P_SZ_UART,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= IRQ_S5P_UART_RX4,
+		.end	= IRQ_S5P_UART_RX4,
+		.flags	= IORESOURCE_IRQ,
+	},
+	[2] = {
+		.start	= IRQ_S5P_UART_TX4,
+		.end	= IRQ_S5P_UART_TX4,
+		.flags	= IORESOURCE_IRQ,
+	},
+	[3] = {
+		.start	= IRQ_S5P_UART_ERR4,
+		.end	= IRQ_S5P_UART_ERR4,
+		.flags	= IORESOURCE_IRQ,
+	},
+#endif
+};
+
+static struct resource s5p_uart5_resource[] = {
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 5
+	[0] = {
+		.start	= S5P_PA_UART5,
+		.end	= S5P_PA_UART5 + S5P_SZ_UART,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= IRQ_S5P_UART_RX5,
+		.end	= IRQ_S5P_UART_RX5,
+		.flags	= IORESOURCE_IRQ,
+	},
+	[2] = {
+		.start	= IRQ_S5P_UART_TX5,
+		.end	= IRQ_S5P_UART_TX5,
+		.flags	= IORESOURCE_IRQ,
+	},
+	[3] = {
+		.start	= IRQ_S5P_UART_ERR5,
+		.end	= IRQ_S5P_UART_ERR5,
+		.flags	= IORESOURCE_IRQ,
+	},
+#endif
+};
+
 struct s3c24xx_uart_resources s5p_uart_resources[] __initdata = {
 	[0] = {
 		.resources	= s5p_uart0_resource,
@@ -136,4 +186,12 @@
 		.resources	= s5p_uart3_resource,
 		.nr_resources	= ARRAY_SIZE(s5p_uart3_resource),
 	},
+	[4] = {
+		.resources	= s5p_uart4_resource,
+		.nr_resources	= ARRAY_SIZE(s5p_uart4_resource),
+	},
+	[5] = {
+		.resources	= s5p_uart5_resource,
+		.nr_resources	= ARRAY_SIZE(s5p_uart5_resource),
+	},
 };
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 12900f7..3198c53 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -458,6 +458,7 @@
 	int
 	depends on ARM && PLAT_SAMSUNG
 	default 2 if ARCH_S3C2400
+	default 6 if ARCH_S5P6450
 	default 4 if SERIAL_SAMSUNG_UARTS_4
 	default 3
 	help
@@ -526,12 +527,12 @@
 	  Serial port support for the Samsung S3C24A0 SoC
 
 config SERIAL_S3C6400
-	tristate "Samsung S3C6400/S3C6410/S5P6440/S5PC100 Serial port support"
-	depends on SERIAL_SAMSUNG && (CPU_S3C6400 || CPU_S3C6410 || CPU_S5P6440 || CPU_S5PC100)
+	tristate "Samsung S3C6400/S3C6410/S5P6440/S5P6450/S5PC100 Serial port support"
+	depends on SERIAL_SAMSUNG && (CPU_S3C6400 || CPU_S3C6410 || CPU_S5P6440 || CPU_S5P6450 || CPU_S5PC100)
 	select SERIAL_SAMSUNG_UARTS_4
 	default y
 	help
-	  Serial port support for the Samsung S3C6400, S3C6410, S5P6440
+	  Serial port support for the Samsung S3C6400, S3C6410, S5P6440, S5P6450
 	  and S5PC100 SoCs
 
 config SERIAL_S5PV210
diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index b1156ba..7ac2bf5 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -1101,7 +1101,7 @@
 	dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
 
 	port->mapbase = res->start;
-	port->membase = S3C_VA_UART + res->start - (S3C_PA_UART & 0xfff00000);
+	port->membase = S3C_VA_UART + (res->start & 0xfffff);
 	ret = platform_get_irq(platdev, 0);
 	if (ret < 0)
 		port->irq = 0;