/*-
 * Copyright (c) 1982, 1986, 1990, 1991 The Regents of the University of
 * California. All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the University of Utah and William Jolitz.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)comreg.h	7.1 (Berkeley) 04/03/91
 */


/* 16 bit baud rate divisor (lower byte in dca_data, upper in dca_ier) */
#define	COMBRD(x)	(1843200 / (16*(x)))

/* interrupt enable register */
#define	IER_ERXRDY	0x1
#define	IER_ETXRDY	0x2
#define	IER_ERLS	0x4
#define	IER_EMSC	0x8

/* interrupt identification register */
#define	IIR_NOPEND	0x1
#define	IIR_IMASK	0x6
#define	IIR_RLS		6
#define	IIR_RXRDY	4
#define	IIR_TXRDY	2
#define	IIR_MLSC	0

/* character format control register */
#define	CFCR_DLAB	0x80
#define	CFCR_SBREAK	0x40
#define	CFCR_PZERO	0x30
#define	CFCR_PONE	0x20
#define	CFCR_PEVEN	0x10
#define	CFCR_PODD	0x00
#define	CFCR_PENAB	0x08
#define	CFCR_STOPB	0x04
#define	CFCR_8BITS	0x03
#define	CFCR_7BITS	0x02
#define	CFCR_6BITS	0x01
#define	CFCR_5BITS	0x00

/* modem control register */
#define	MCR_LOOPBACK	0x10
#define	MCR_IENABLE	0x08
#define	MCR_DRS		0x04
#define	MCR_RTS		0x02
#define	MCR_DTR		0x01

/* line status register */
#define	LSR_TSRE	0x40
#define	LSR_TXRDY	0x20
#define	LSR_BI		0x10
#define	LSR_FE		0x08
#define	LSR_PE		0x04
#define	LSR_OE		0x02
#define	LSR_RXRDY	0x01

/* modem status register */
#define	MSR_DCD		0x80
#define	MSR_RI		0x40
#define	MSR_DSR		0x20
#define	MSR_CTS		0x10
#define	MSR_DDCD	0x08
#define	MSR_TERI	0x04
#define	MSR_DDSR	0x02
#define	MSR_DCTS	0x01