diff --git a/drivers/serial/m32r_sio.c b/drivers/serial/m32r_sio.c
index e7fe4bb..28c9ce6 100644
--- a/drivers/serial/m32r_sio.c
+++ b/drivers/serial/m32r_sio.c
@@ -76,7 +76,7 @@
  */
 #define is_real_interrupt(irq)	((irq) != 0)
 
-#include <asm/serial.h>
+#define BASE_BAUD	115200
 
 /* Standard COM flags */
 #define STD_COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST)
@@ -86,7 +86,6 @@
  * standard enumeration mechanism.   Platforms that can find all
  * serial ports via mechanisms like ACPI or PCI need not supply it.
  */
-#undef SERIAL_PORT_DFNS
 #if defined(CONFIG_PLAT_USRV)
 
 #define SERIAL_PORT_DFNS						\
@@ -109,7 +108,7 @@
 #endif /* !CONFIG_PLAT_USRV */
 
 static struct old_serial_port old_serial_port[] = {
-	SERIAL_PORT_DFNS	/* defined in asm/serial.h */
+	SERIAL_PORT_DFNS
 };
 
 #define UART_NR	ARRAY_SIZE(old_serial_port)