diff --git a/drivers/serial/sunsab.h b/drivers/serial/sunsab.h
new file mode 100644
index 0000000..686086f
--- /dev/null
+++ b/drivers/serial/sunsab.h
@@ -0,0 +1,321 @@
+/* sunsab.h: Register Definitions for the Siemens SAB82532 DUSCC
+ *
+ * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
+ */
+
+#ifndef _SUNSAB_H
+#define _SUNSAB_H
+
+struct sab82532_async_rd_regs {
+	u8	rfifo[0x20];	/* Receive FIFO				*/
+	u8	star;		/* Status Register			*/
+	u8	__pad1;
+	u8	mode;		/* Mode Register			*/
+	u8	timr;		/* Timer Register			*/
+	u8	xon;		/* XON Character			*/
+	u8	xoff;		/* XOFF Character			*/
+	u8	tcr;		/* Termination Character Register	*/
+	u8	dafo;		/* Data Format				*/
+	u8	rfc;		/* RFIFO Control Register		*/
+	u8	__pad2;
+	u8	rbcl;		/* Receive Byte Count Low		*/
+	u8	rbch;		/* Receive Byte Count High		*/
+	u8	ccr0;		/* Channel Configuration Register 0	*/
+	u8	ccr1;		/* Channel Configuration Register 1	*/
+	u8	ccr2;		/* Channel Configuration Register 2	*/
+	u8	ccr3;		/* Channel Configuration Register 3	*/
+	u8	__pad3[4];
+	u8	vstr;		/* Version Status Register		*/
+	u8	__pad4[3];
+	u8	gis;		/* Global Interrupt Status		*/
+	u8	ipc;		/* Interrupt Port Configuration		*/
+	u8	isr0;		/* Interrupt Status 0			*/
+	u8	isr1;		/* Interrupt Status 1			*/
+	u8	pvr;		/* Port Value Register			*/
+	u8	pis;		/* Port Interrupt Status		*/
+	u8	pcr;		/* Port Configuration Register		*/
+	u8	ccr4;		/* Channel Configuration Register 4	*/
+};
+
+struct sab82532_async_wr_regs {
+	u8	xfifo[0x20];	/* Transmit FIFO			*/
+	u8	cmdr;		/* Command Register			*/
+	u8	__pad1;
+	u8	mode;
+	u8	timr;
+	u8	xon;
+	u8	xoff;
+	u8	tcr;
+	u8	dafo;
+	u8	rfc;
+	u8	__pad2;
+	u8	xbcl;		/* Transmit Byte Count Low		*/
+	u8	xbch;		/* Transmit Byte Count High		*/
+	u8	ccr0;
+	u8	ccr1;
+	u8	ccr2;
+	u8	ccr3;
+	u8	tsax;		/* Time-Slot Assignment Reg. Transmit	*/
+	u8	tsar;		/* Time-Slot Assignment Reg. Receive	*/
+	u8	xccr;		/* Transmit Channel Capacity Register	*/
+	u8	rccr;		/* Receive Channel Capacity Register	*/
+	u8	bgr;		/* Baud Rate Generator Register		*/
+	u8	tic;		/* Transmit Immediate Character		*/
+	u8	mxn;		/* Mask XON Character			*/
+	u8	mxf;		/* Mask XOFF Character			*/
+	u8	iva;		/* Interrupt Vector Address		*/
+	u8	ipc;
+	u8	imr0;		/* Interrupt Mask Register 0		*/
+	u8	imr1;		/* Interrupt Mask Register 1		*/
+	u8	pvr;
+	u8	pim;		/* Port Interrupt Mask			*/
+	u8	pcr;
+	u8	ccr4;
+};
+
+struct sab82532_async_rw_regs {	/* Read/Write registers			*/
+	u8	__pad1[0x20];
+	u8	__pad2;
+	u8	__pad3;
+	u8	mode;
+	u8	timr;
+	u8	xon;
+	u8	xoff;
+	u8	tcr;
+	u8	dafo;
+	u8	rfc;
+	u8	__pad4;
+	u8	__pad5;
+	u8	__pad6;
+	u8	ccr0;
+	u8	ccr1;
+	u8	ccr2;
+	u8	ccr3;
+	u8	__pad7;
+	u8	__pad8;
+	u8	__pad9;
+	u8	__pad10;
+	u8	__pad11;
+	u8	__pad12;
+	u8	__pad13;
+	u8	__pad14;
+	u8	__pad15;
+	u8	ipc;
+	u8	__pad16;
+	u8	__pad17;
+	u8	pvr;
+	u8	__pad18;
+	u8	pcr;
+	u8	ccr4;
+};
+
+union sab82532_async_regs {
+	__volatile__ struct sab82532_async_rd_regs	r;
+	__volatile__ struct sab82532_async_wr_regs	w;
+	__volatile__ struct sab82532_async_rw_regs	rw;
+};
+
+union sab82532_irq_status {
+	unsigned short			 stat;
+	struct {
+		unsigned char		 isr0;
+		unsigned char		 isr1;
+	} sreg;
+};
+
+/* irqflags bits */
+#define SAB82532_ALLS			0x00000001
+#define SAB82532_XPR			0x00000002
+
+/* RFIFO Status Byte */
+#define SAB82532_RSTAT_PE		0x80
+#define SAB82532_RSTAT_FE		0x40
+#define SAB82532_RSTAT_PARITY		0x01
+
+/* Status Register (STAR) */
+#define SAB82532_STAR_XDOV		0x80
+#define SAB82532_STAR_XFW		0x40
+#define SAB82532_STAR_RFNE		0x20
+#define SAB82532_STAR_FCS		0x10
+#define SAB82532_STAR_TEC		0x08
+#define SAB82532_STAR_CEC		0x04
+#define SAB82532_STAR_CTS		0x02
+
+/* Command Register (CMDR) */
+#define SAB82532_CMDR_RMC		0x80
+#define SAB82532_CMDR_RRES		0x40
+#define SAB82532_CMDR_RFRD		0x20
+#define SAB82532_CMDR_STI		0x10
+#define SAB82532_CMDR_XF		0x08
+#define SAB82532_CMDR_XRES		0x01
+
+/* Mode Register (MODE) */
+#define SAB82532_MODE_FRTS		0x40
+#define SAB82532_MODE_FCTS		0x20
+#define SAB82532_MODE_FLON		0x10
+#define SAB82532_MODE_RAC		0x08
+#define SAB82532_MODE_RTS		0x04
+#define SAB82532_MODE_TRS		0x02
+#define SAB82532_MODE_TLP		0x01
+
+/* Timer Register (TIMR) */
+#define SAB82532_TIMR_CNT_MASK		0xe0
+#define SAB82532_TIMR_VALUE_MASK	0x1f
+
+/* Data Format (DAFO) */
+#define SAB82532_DAFO_XBRK		0x40
+#define SAB82532_DAFO_STOP		0x20
+#define SAB82532_DAFO_PAR_SPACE		0x00
+#define SAB82532_DAFO_PAR_ODD		0x08
+#define SAB82532_DAFO_PAR_EVEN		0x10
+#define SAB82532_DAFO_PAR_MARK		0x18
+#define SAB82532_DAFO_PARE		0x04
+#define SAB82532_DAFO_CHL8		0x00
+#define SAB82532_DAFO_CHL7		0x01
+#define SAB82532_DAFO_CHL6		0x02
+#define SAB82532_DAFO_CHL5		0x03
+
+/* RFIFO Control Register (RFC) */
+#define SAB82532_RFC_DPS		0x40
+#define SAB82532_RFC_DXS		0x20
+#define SAB82532_RFC_RFDF		0x10
+#define SAB82532_RFC_RFTH_1		0x00
+#define SAB82532_RFC_RFTH_4		0x04
+#define SAB82532_RFC_RFTH_16		0x08
+#define SAB82532_RFC_RFTH_32		0x0c
+#define SAB82532_RFC_TCDE		0x01
+
+/* Received Byte Count High (RBCH) */
+#define SAB82532_RBCH_DMA		0x80
+#define SAB82532_RBCH_CAS		0x20
+
+/* Transmit Byte Count High (XBCH) */
+#define SAB82532_XBCH_DMA		0x80
+#define SAB82532_XBCH_CAS		0x20
+#define SAB82532_XBCH_XC		0x10
+
+/* Channel Configuration Register 0 (CCR0) */
+#define SAB82532_CCR0_PU		0x80
+#define SAB82532_CCR0_MCE		0x40
+#define SAB82532_CCR0_SC_NRZ		0x00
+#define SAB82532_CCR0_SC_NRZI		0x08
+#define SAB82532_CCR0_SC_FM0		0x10
+#define SAB82532_CCR0_SC_FM1		0x14
+#define SAB82532_CCR0_SC_MANCH		0x18
+#define SAB82532_CCR0_SM_HDLC		0x00
+#define SAB82532_CCR0_SM_SDLC_LOOP	0x01
+#define SAB82532_CCR0_SM_BISYNC		0x02
+#define SAB82532_CCR0_SM_ASYNC		0x03
+
+/* Channel Configuration Register 1 (CCR1) */
+#define SAB82532_CCR1_ODS		0x10
+#define SAB82532_CCR1_BCR		0x08
+#define SAB82532_CCR1_CM_MASK		0x07
+
+/* Channel Configuration Register 2 (CCR2) */
+#define SAB82532_CCR2_SOC1		0x80
+#define SAB82532_CCR2_SOC0		0x40
+#define SAB82532_CCR2_BR9		0x80
+#define SAB82532_CCR2_BR8		0x40
+#define SAB82532_CCR2_BDF		0x20
+#define SAB82532_CCR2_SSEL		0x10
+#define SAB82532_CCR2_XCS0		0x20
+#define SAB82532_CCR2_RCS0		0x10
+#define SAB82532_CCR2_TOE		0x08
+#define SAB82532_CCR2_RWX		0x04
+#define SAB82532_CCR2_DIV		0x01
+
+/* Channel Configuration Register 3 (CCR3) */
+#define SAB82532_CCR3_PSD		0x01
+
+/* Time Slot Assignment Register Transmit (TSAX) */
+#define SAB82532_TSAX_TSNX_MASK		0xfc
+#define SAB82532_TSAX_XCS2		0x02	/* see also CCR2 */
+#define SAB82532_TSAX_XCS1		0x01
+
+/* Time Slot Assignment Register Receive (TSAR) */
+#define SAB82532_TSAR_TSNR_MASK		0xfc
+#define SAB82532_TSAR_RCS2		0x02	/* see also CCR2 */
+#define SAB82532_TSAR_RCS1		0x01
+
+/* Version Status Register (VSTR) */
+#define SAB82532_VSTR_CD		0x80
+#define SAB82532_VSTR_DPLA		0x40
+#define SAB82532_VSTR_VN_MASK		0x0f
+#define SAB82532_VSTR_VN_1		0x00
+#define SAB82532_VSTR_VN_2		0x01
+#define SAB82532_VSTR_VN_3_2		0x02
+
+/* Global Interrupt Status Register (GIS) */
+#define SAB82532_GIS_PI			0x80
+#define SAB82532_GIS_ISA1		0x08
+#define SAB82532_GIS_ISA0		0x04
+#define SAB82532_GIS_ISB1		0x02
+#define SAB82532_GIS_ISB0		0x01
+
+/* Interrupt Vector Address (IVA) */
+#define SAB82532_IVA_MASK		0xf1
+
+/* Interrupt Port Configuration (IPC) */
+#define SAB82532_IPC_VIS		0x80
+#define SAB82532_IPC_SLA1		0x10
+#define SAB82532_IPC_SLA0		0x08
+#define SAB82532_IPC_CASM		0x04
+#define SAB82532_IPC_IC_OPEN_DRAIN	0x00
+#define SAB82532_IPC_IC_ACT_LOW		0x01
+#define SAB82532_IPC_IC_ACT_HIGH	0x03
+
+/* Interrupt Status Register 0 (ISR0) */
+#define SAB82532_ISR0_TCD		0x80
+#define SAB82532_ISR0_TIME		0x40
+#define SAB82532_ISR0_PERR		0x20
+#define SAB82532_ISR0_FERR		0x10
+#define SAB82532_ISR0_PLLA		0x08
+#define SAB82532_ISR0_CDSC		0x04
+#define SAB82532_ISR0_RFO		0x02
+#define SAB82532_ISR0_RPF		0x01
+
+/* Interrupt Status Register 1 (ISR1) */
+#define SAB82532_ISR1_BRK		0x80
+#define SAB82532_ISR1_BRKT		0x40
+#define SAB82532_ISR1_ALLS		0x20
+#define SAB82532_ISR1_XOFF		0x10
+#define SAB82532_ISR1_TIN		0x08
+#define SAB82532_ISR1_CSC		0x04
+#define SAB82532_ISR1_XON		0x02
+#define SAB82532_ISR1_XPR		0x01
+
+/* Interrupt Mask Register 0 (IMR0) */
+#define SAB82532_IMR0_TCD		0x80
+#define SAB82532_IMR0_TIME		0x40
+#define SAB82532_IMR0_PERR		0x20
+#define SAB82532_IMR0_FERR		0x10
+#define SAB82532_IMR0_PLLA		0x08
+#define SAB82532_IMR0_CDSC		0x04
+#define SAB82532_IMR0_RFO		0x02
+#define SAB82532_IMR0_RPF		0x01
+
+/* Interrupt Mask Register 1 (IMR1) */
+#define SAB82532_IMR1_BRK		0x80
+#define SAB82532_IMR1_BRKT		0x40
+#define SAB82532_IMR1_ALLS		0x20
+#define SAB82532_IMR1_XOFF		0x10
+#define SAB82532_IMR1_TIN		0x08
+#define SAB82532_IMR1_CSC		0x04
+#define SAB82532_IMR1_XON		0x02
+#define SAB82532_IMR1_XPR		0x01
+
+/* Port Interrupt Status Register (PIS) */
+#define SAB82532_PIS_SYNC_B		0x08
+#define SAB82532_PIS_DTR_B		0x04
+#define SAB82532_PIS_DTR_A		0x02
+#define SAB82532_PIS_SYNC_A		0x01
+
+/* Channel Configuration Register 4 (CCR4) */
+#define SAB82532_CCR4_MCK4		0x80
+#define SAB82532_CCR4_EBRG		0x40
+#define SAB82532_CCR4_TST1		0x20
+#define SAB82532_CCR4_ICD		0x10
+
+
+#endif /* !(_SUNSAB_H) */