diff --git a/arch/mn10300/kernel/mn10300-serial.h b/arch/mn10300/kernel/mn10300-serial.h
new file mode 100644
index 0000000..6796499
--- /dev/null
+++ b/arch/mn10300/kernel/mn10300-serial.h
@@ -0,0 +1,126 @@
+/* MN10300 On-chip serial port driver definitions
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#ifndef _MN10300_SERIAL_H
+#define _MN10300_SERIAL_H
+
+#ifndef __ASSEMBLY__
+#include <linux/serial_core.h>
+#include <linux/termios.h>
+#endif
+
+#include <asm/page.h>
+#include <asm/serial-regs.h>
+
+#define NR_PORTS		3		/* should be set 3 or 9 or 16 */
+
+#define MNSC_BUFFER_SIZE	+(PAGE_SIZE / 2)
+
+/* intr_flags bits */
+#define MNSCx_RX_AVAIL		0x01
+#define MNSCx_RX_OVERF		0x02
+#define MNSCx_TX_SPACE		0x04
+#define MNSCx_TX_EMPTY		0x08
+
+#ifndef __ASSEMBLY__
+
+struct mn10300_serial_port {
+	char			*rx_buffer;	/* reception buffer base */
+	unsigned		rx_inp;		/* pointer to rx input offset */
+	unsigned		rx_outp;	/* pointer to rx output offset */
+	u8			tx_xchar;	/* high-priority XON/XOFF buffer */
+	u8			tx_break;	/* transmit break request */
+	u8			intr_flags;	/* interrupt flags */
+	volatile u16		*rx_icr;	/* Rx interrupt control register */
+	volatile u16		*tx_icr;	/* Tx interrupt control register */
+	int			rx_irq;		/* reception IRQ */
+	int			tx_irq;		/* transmission IRQ */
+	int			tm_irq;		/* timer IRQ */
+
+	const char		*name;		/* name of serial port */
+	const char		*rx_name;	/* Rx interrupt handler name of serial port */
+	const char		*tx_name;	/* Tx interrupt handler name of serial port */
+	const char		*tm_name;	/* Timer interrupt handler name */
+	unsigned short		type;		/* type of serial port */
+	unsigned char		isconsole;	/* T if it's a console */
+	volatile void		*_iobase;	/* pointer to base of I/O control regs */
+	volatile u16		*_control;	/* control register pointer */
+	volatile u8		*_status;	/* status register pointer */
+	volatile u8		*_intr;		/* interrupt register pointer */
+	volatile void		*_rxb;		/* receive buffer register pointer */
+	volatile void		*_txb;		/* transmit buffer register pointer */
+	volatile u16		*_tmicr;	/* timer interrupt control register */
+	volatile u8		*_tmxmd;	/* baud rate timer mode register */
+	volatile u16		*_tmxbr;	/* baud rate timer base register */
+
+	/* this must come down here so that assembly can use BSET to access the
+	 * above fields */
+	struct uart_port	uart;
+
+	unsigned short		rx_brk;		/* current break reception status */
+	u16			tx_cts;		/* current CTS status */
+	int			gdbstub;	/* preemptively stolen by GDB stub */
+
+	u8			clock_src;	/* clock source */
+#define MNSCx_CLOCK_SRC_IOCLK	0
+#define MNSCx_CLOCK_SRC_IOBCLK	1
+
+	u8			div_timer;	/* timer used as divisor */
+#define MNSCx_DIV_TIMER_16BIT	0
+#define MNSCx_DIV_TIMER_8BIT	1
+
+	u16			options;	/* options */
+#define MNSCx_OPT_CTS		0x0001
+
+	unsigned long		ioclk;		/* base clock rate */
+};
+
+#ifdef CONFIG_MN10300_TTYSM0
+extern struct mn10300_serial_port mn10300_serial_port_sif0;
+#endif
+
+#ifdef CONFIG_MN10300_TTYSM1
+extern struct mn10300_serial_port mn10300_serial_port_sif1;
+#endif
+
+#ifdef CONFIG_MN10300_TTYSM2
+extern struct mn10300_serial_port mn10300_serial_port_sif2;
+#endif
+
+extern struct mn10300_serial_port *mn10300_serial_ports[];
+
+struct mn10300_serial_int {
+	struct mn10300_serial_port *port;
+	asmlinkage void (*vdma)(void);
+};
+
+extern struct mn10300_serial_int mn10300_serial_int_tbl[];
+
+extern asmlinkage void mn10300_serial_vdma_interrupt(void);
+extern asmlinkage void mn10300_serial_vdma_rx_handler(void);
+extern asmlinkage void mn10300_serial_vdma_tx_handler(void);
+
+#endif /* __ASSEMBLY__ */
+
+#if defined(CONFIG_GDBSTUB_ON_TTYSM0)
+#define SCgSTR SC0STR
+#define SCgRXB SC0RXB
+#define SCgRXIRQ SC0RXIRQ
+#elif defined(CONFIG_GDBSTUB_ON_TTYSM1)
+#define SCgSTR SC1STR
+#define SCgRXB SC1RXB
+#define SCgRXIRQ SC1RXIRQ
+#elif defined(CONFIG_GDBSTUB_ON_TTYSM2)
+#define SCgSTR SC2STR
+#define SCgRXB SC2RXB
+#define SCgRXIRQ SC2RXIRQ
+#endif
+
+#endif /* _MN10300_SERIAL_H */