/*-

 * Copyright (c) 1991 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *	This product includes software developed by the University of

 *	California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * $FreeBSD: src/sys/isa/sio.c,v 1.291 2000/03/11 20:22:09 imp Exp $

 *	from: @(#)com.c	7.5 (Berkeley) 5/16/91

 *	from: i386/isa sio.c,v 1.234

 */

#define	SIO_MAXUNITS		64	/* max sio ports */

#define	CE_NTYPES		3

/* types.  XXX - should be elsewhere */

typedef u_int	Port_t;		/* hardware port */

typedef u_char	bool_t;		/* boolean */

/* queue of linear buffers */

struct lbq {

	u_char	*l_head;	/* next char to process */

	u_char	*l_tail;	/* one past the last char to process */

	struct lbq *l_next;	/* next in queue */

	bool_t	l_queued;	/* nonzero if queued */

};

/* com device structure */

struct com_s {

	u_int	flags;		/* Copy isa device flags */

	u_char	state;		/* miscellaneous flag bits */

	bool_t  active_out;	/* nonzero if the callout device is open */

	u_char	cfcr_image;	/* copy of value written to CFCR */

#ifdef COM_ESP

	bool_t	esp;		/* is this unit a hayes esp board? */

#endif

	u_char	extra_state;	/* more flag bits, separate for order trick */

	u_char	fifo_image;	/* copy of value written to FIFO */

	bool_t	hasfifo;	/* nonzero for 16550 UARTs */

	bool_t	st16650a;	/* Is a Startech 16650A or RTS/CTS compat */

	bool_t	loses_outints;	/* nonzero if device loses output interrupts */

	u_char	mcr_image;	/* copy of value written to MCR */

#ifdef COM_MULTIPORT

	bool_t	multiport;	/* is this unit part of a multiport device? */

#endif /* COM_MULTIPORT */

	bool_t	no_irq;		/* nonzero if irq is not attached */

	bool_t  gone;		/* hardware disappeared */

	bool_t	poll;		/* nonzero if polling is required */

	bool_t	poll_output;	/* nonzero if polling for output is required */

	int	unit;		/* unit	number */

	int	dtr_wait;	/* time to hold DTR down on close (* 1/hz) */

	u_int	tx_fifo_size;

	u_int	wopeners;	/* # processes waiting for DCD in open() */

	/*

	 * The high level of the driver never reads status registers directly

	 * because there would be too many side effects to handle conveniently.

	 * Instead, it reads copies of the registers stored here by the

	 * interrupt handler.

	 */

	u_char	last_modem_status;	/* last MSR read by intr handler */

	u_char	prev_modem_status;	/* last MSR handled by high level */

	u_char	hotchar;	/* ldisc-specific char to be handled ASAP */

	u_char	*ibuf;		/* start of input buffer */

	u_char	*ibufend;	/* end of input buffer */

	u_char	*ibufold;	/* old input buffer, to be freed */

	u_char	*ihighwater;	/* threshold in input buffer */

	u_char	*iptr;		/* next free spot in input buffer */

	int	ibufsize;	/* size of ibuf (not include error bytes) */

	int	ierroff;	/* offset of error bytes in ibuf */

	struct lbq	obufq;	/* head of queue of output buffers */

	struct lbq	obufs[2];	/* output buffers */

	Port_t	data_port;	/* i/o ports */

#ifdef COM_ESP

	Port_t	esp_port;

#endif

	Port_t	int_id_port;

	Port_t	iobase;

	Port_t	modem_ctl_port;

	Port_t	line_status_port;

	Port_t	modem_status_port;

	Port_t	intr_ctl_port;	/* Ports of IIR register */

	struct tty	*tp;	/* cross reference */

	/* Initial state. */

	struct termios	it_in;	/* should be in struct tty */

	struct termios	it_out;

	/* Lock state. */

	struct termios	lt_in;	/* should be in struct tty */

	struct termios	lt_out;

	bool_t	do_timestamp;

	bool_t	do_dcd_timestamp;

	struct timeval	timestamp;

	struct timeval	dcd_timestamp;

	struct	pps_state pps;

	u_long	bytes_in;	/* statistics */

	u_long	bytes_out;

	u_int	delta_error_counts[CE_NTYPES];

	u_long	error_counts[CE_NTYPES];

	struct resource *irqres;

	struct resource *ioportres;

	void *cookie;

	/*

	 * Data area for output buffers.  Someday we should build the output

	 * buffer queue without copying data.

	 */

	u_char	obuf1[256];

	u_char	obuf2[256];

};

int	sio_attach_unit	(struct com_s *com, int unit, Port_t iobase, 

			 u_int flags, bool_t no_irq);

void	siointr1 (struct com_s *com);