[unix-history] / usr / src / sys / i386 / isa / com.c

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)com.c	7.7 (Berkeley) %G%
 */

#include "com.h"
#if NCOM > 0
/*
 * COM driver, based on HP dca driver
 * uses National Semiconductor NS16450/NS16550AF UART
 */
#include "param.h"
#include "systm.h"
#include "ioctl.h"
#include "tty.h"
#include "proc.h"
#include "user.h"
#include "conf.h"
#include "file.h"
#include "uio.h"
#include "kernel.h"
#include "syslog.h"

#include "i386/isa/isa_device.h"
#include "i386/isa/comreg.h"
#include "i386/isa/ic/ns16550.h"

void	comstart();
int 	comprobe(), comattach(), comintr(), comparam();

struct	isa_driver comdriver = {
	comprobe, comattach, "com"
};

int	comsoftCAR;
int	com_active;
int	com_hasfifo;
int	ncom = NCOM;
#ifdef COMCONSOLE
int	comconsole = COMCONSOLE;
#else
int	comconsole = -1;
#endif
int	comconsinit;
int	comdefaultrate = TTYDEF_SPEED;
int	commajor;
short com_addr[NCOM];
struct	tty com_tty[NCOM];

struct speedtab comspeedtab[] = {
	0,	0,
	50,	COMBRD(50),
	75,	COMBRD(75),
	110,	COMBRD(110),
	134,	COMBRD(134),
	150,	COMBRD(150),
	200,	COMBRD(200),
	300,	COMBRD(300),
	600,	COMBRD(600),
	1200,	COMBRD(1200),
	1800,	COMBRD(1800),
	2400,	COMBRD(2400),
	4800,	COMBRD(4800),
	9600,	COMBRD(9600),
	19200,	COMBRD(19200),
	38400,	COMBRD(38400),
	57600,	COMBRD(57600),
	-1,	-1
};

extern	struct tty *constty;
#ifdef KGDB
#include "machine/remote-sl.h"

extern int kgdb_dev;
extern int kgdb_rate;
extern int kgdb_debug_init;
#endif

#define	UNIT(x)		minor(x)

comprobe(dev)
struct isa_device *dev;
{
	/* force access to id reg */
	outb(dev->id_iobase+com_cfcr, 0);
	outb(dev->id_iobase+com_iir, 0);
	if ((inb(dev->id_iobase+com_iir) & 0x38) == 0)
		return(1);
	return(1);

}


int
comattach(isdp)
struct isa_device *isdp;
{
	struct	tty	*tp;
	u_char		unit;
	int		port = isdp->id_iobase;

	unit = isdp->id_unit;
	if (unit == comconsole)
		DELAY(100000);
	com_addr[unit] = port;
	com_active |= 1 << unit;
	comsoftCAR |= 1 << unit;	/* XXX */

	/* look for a NS 16550AF UART with FIFOs */
	outb(port+com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_14);
	DELAY(100);
	if ((inb(port+com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK)
		com_hasfifo |= 1 << unit;

	outb(port+com_ier, 0);
	outb(port+com_mcr, 0 | MCR_IENABLE);
#ifdef KGDB
	if (kgdb_dev == makedev(commajor, unit)) {
		if (comconsole == unit)
			kgdb_dev = -1;	/* can't debug over console port */
		else {
			(void) cominit(unit, kgdb_rate);
			if (kgdb_debug_init) {
				/*
				 * Print prefix of device name,
				 * let kgdb_connect print the rest.
				 */
				printf("com%d: ", unit);
				kgdb_connect(1);
			} else
				printf("com%d: kgdb enabled\n", unit);
		}
	}
#endif
	/*
	 * Need to reset baud rate, etc. of next print so reset comconsinit.
	 * Also make sure console is always "hardwired"
	 */
	if (unit == comconsole) {
		comconsinit = 0;
		comsoftCAR |= (1 << unit);
	}
	return (1);
}

/* ARGSUSED */
#ifdef __STDC__
comopen(dev_t dev, int flag, int mode, struct proc *p)
#else
comopen(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
#endif
{
	register struct tty *tp;
	register int unit;
	int error = 0;
 
	unit = UNIT(dev);
	if (unit >= NCOM || (com_active & (1 << unit)) == 0)
		return (ENXIO);
	tp = &com_tty[unit];
	tp->t_oproc = comstart;
	tp->t_param = comparam;
	tp->t_dev = dev;
	if ((tp->t_state & TS_ISOPEN) == 0) {
		tp->t_state |= TS_WOPEN;
		ttychars(tp);
		if (tp->t_ispeed == 0) {
			tp->t_iflag = TTYDEF_IFLAG;
			tp->t_oflag = TTYDEF_OFLAG;
			tp->t_cflag = TTYDEF_CFLAG;
			tp->t_lflag = TTYDEF_LFLAG;
			tp->t_ispeed = tp->t_ospeed = comdefaultrate;
		}
		comparam(tp, &tp->t_termios);
		ttsetwater(tp);
	} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
		return (EBUSY);
	(void) spltty();
	(void) commctl(dev, MCR_DTR | MCR_RTS, DMSET);
	if ((comsoftCAR & (1 << unit)) || (commctl(dev, 0, DMGET) & MSR_DCD))
		tp->t_state |= TS_CARR_ON;
	while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
	       (tp->t_state & TS_CARR_ON) == 0) {
		tp->t_state |= TS_WOPEN;
		if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
		    ttopen, 0))
			break;
	}
	(void) spl0();
	if (error == 0)
		error = (*linesw[tp->t_line].l_open)(dev, tp);
	return (error);
}
 
/*ARGSUSED*/
comclose(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
{
	register struct tty *tp;
	register com;
	register int unit;
 
	unit = UNIT(dev);
	com = com_addr[unit];
	tp = &com_tty[unit];
	(*linesw[tp->t_line].l_close)(tp, flag);
	outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
#ifdef KGDB
	/* do not disable interrupts if debugging */
	if (kgdb_dev != makedev(commajor, unit))
#endif
	outb(com+com_ier, 0);
	if (tp->t_cflag&HUPCL || tp->t_state&TS_WOPEN || 
	    (tp->t_state&TS_ISOPEN) == 0)
		(void) commctl(dev, 0, DMSET);
	ttyclose(tp);
	return(0);
}
 
comread(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
{
	register struct tty *tp = &com_tty[UNIT(dev)];
 
	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
 
comwrite(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
{
	int unit = UNIT(dev);
	register struct tty *tp = &com_tty[unit];
 
	/*
	 * (XXX) We disallow virtual consoles if the physical console is
	 * a serial port.  This is in case there is a display attached that
	 * is not the console.  In that situation we don't need/want the X
	 * server taking over the console.
	 */
	if (constty && unit == comconsole)
		constty = NULL;
	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
 
comintr(unit)
	register int unit;
{
	register com;
	register u_char code;
	register struct tty *tp;

	com = com_addr[unit];
	while (1) {
		code = inb(com+com_iir);
		switch (code & IIR_IMASK) {
		case IIR_NOPEND:
			return (1);
		case IIR_RXTOUT:
		case IIR_RXRDY:
			tp = &com_tty[unit];
/*
 * Process received bytes.  Inline for speed...
 */
#ifdef KGDB
#define	RCVBYTE() \
			code = inb(com+com_data); \
			if ((tp->t_state & TS_ISOPEN) == 0) { \
				if (kgdb_dev == makedev(commajor, unit) && \
				    code == FRAME_END) \
					kgdb_connect(0); /* trap into kgdb */ \
			} else \
				(*linesw[tp->t_line].l_rint)(code, tp)
#else
#define	RCVBYTE() \
			code = inb(com+com_data); \
			if (tp->t_state & TS_ISOPEN) \
				(*linesw[tp->t_line].l_rint)(code, tp)
#endif

			RCVBYTE();

			if (com_hasfifo & (1 << unit))
				while ((code = inb(com+com_lsr)) & LSR_RCV_MASK) {
					if (code == LSR_RXRDY) {
						RCVBYTE();
					} else
						comeint(unit, code, com);
				}
			break;
		case IIR_TXRDY:
			tp = &com_tty[unit];
			tp->t_state &=~ (TS_BUSY|TS_FLUSH);
			if (tp->t_line)
				(*linesw[tp->t_line].l_start)(tp);
			else
				comstart(tp);
			break;
		case IIR_RLS:
			comeint(unit, inb(com+com_lsr), com);
			break;
		default:
			if (code & IIR_NOPEND)
				return (1);
			log(LOG_WARNING, "com%d: weird interrupt: 0x%x\n",
			    unit, code);
			/* fall through */
		case IIR_MLSC:
			commint(unit, com);
			break;
		}
	}
}

comeint(unit, stat, com)
	register int unit, stat;
	register com;
{
	register struct tty *tp;
	register int c;

	tp = &com_tty[unit];
	c = inb(com+com_data);
	if ((tp->t_state & TS_ISOPEN) == 0) {
#ifdef KGDB
		/* we don't care about parity errors */
		if (((stat & (LSR_BI|LSR_FE|LSR_PE)) == LSR_PE) &&
		    kgdb_dev == makedev(commajor, unit) && c == FRAME_END)
			kgdb_connect(0); /* trap into kgdb */
#endif
		return;
	}
	if (stat & (LSR_BI | LSR_FE))
		c |= TTY_FE;
	else if (stat & LSR_PE)
		c |= TTY_PE;
	else if (stat & LSR_OE)
		log(LOG_WARNING, "com%d: silo overflow\n", unit);
	(*linesw[tp->t_line].l_rint)(c, tp);
}

commint(unit, com)
	register int unit;
	register com;
{
	register struct tty *tp;
	register int stat;

	tp = &com_tty[unit];
	stat = inb(com+com_msr);
	if ((stat & MSR_DDCD) && (comsoftCAR & (1 << unit)) == 0) {
		if (stat & MSR_DCD)
			(void)(*linesw[tp->t_line].l_modem)(tp, 1);
		else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0)
			outb(com+com_mcr,
				inb(com+com_mcr) & ~(MCR_DTR | MCR_RTS) | MCR_IENABLE);
	} else if ((stat & MSR_DCTS) && (tp->t_state & TS_ISOPEN) &&
		   (tp->t_flags & CRTSCTS)) {
		/* the line is up and we want to do rts/cts flow control */
		if (stat & MSR_CTS) {
			tp->t_state &=~ TS_TTSTOP;
			ttstart(tp);
		} else
			tp->t_state |= TS_TTSTOP;
	}
}

comioctl(dev, cmd, data, flag, p)
	dev_t dev;
	int cmd, flag;
	caddr_t data;
	struct proc *p;
{
	register struct tty *tp;
	register int unit = UNIT(dev);
	register com;
	register int error;
 
	tp = &com_tty[unit];
	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
	if (error >= 0)
		return (error);
	error = ttioctl(tp, cmd, data, flag);
	if (error >= 0)
		return (error);

	com = com_addr[unit];
	switch (cmd) {

	case TIOCSBRK:
		outb(com+com_cfcr, inb(com+com_cfcr) | CFCR_SBREAK);
		break;

	case TIOCCBRK:
		outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
		break;

	case TIOCSDTR:
		(void) commctl(dev, MCR_DTR | MCR_RTS, DMBIS);
		break;

	case TIOCCDTR:
		(void) commctl(dev, MCR_DTR | MCR_RTS, DMBIC);
		break;

	case TIOCMSET:
		(void) commctl(dev, *(int *)data, DMSET);
		break;

	case TIOCMBIS:
		(void) commctl(dev, *(int *)data, DMBIS);
		break;

	case TIOCMBIC:
		(void) commctl(dev, *(int *)data, DMBIC);
		break;

	case TIOCMGET:
		*(int *)data = commctl(dev, 0, DMGET);
		break;

	default:
		return (ENOTTY);
	}
	return (0);
}

comparam(tp, t)
	register struct tty *tp;
	register struct termios *t;
{
	register com;
	register int cfcr, cflag = t->c_cflag;
	int unit = UNIT(tp->t_dev);
	int ospeed = ttspeedtab(t->c_ospeed, comspeedtab);
 
	/* check requested parameters */
        if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
                return(EINVAL);
        /* and copy to tty */
        tp->t_ispeed = t->c_ispeed;
        tp->t_ospeed = t->c_ospeed;
        tp->t_cflag = cflag;

	com = com_addr[unit];
	outb(com+com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS /*| IER_EMSC*/);
	if (ospeed == 0) {
		(void) commctl(unit, 0, DMSET);	/* hang up line */
		return(0);
	}
	outb(com+com_cfcr, inb(com+com_cfcr) | CFCR_DLAB);
	outb(com+com_data, ospeed & 0xFF);
	outb(com+com_ier, ospeed >> 8);
	switch (cflag&CSIZE) {
	case CS5:
		cfcr = CFCR_5BITS; break;
	case CS6:
		cfcr = CFCR_6BITS; break;
	case CS7:
		cfcr = CFCR_7BITS; break;
	case CS8:
		cfcr = CFCR_8BITS; break;
	}
	if (cflag&PARENB) {
		cfcr |= CFCR_PENAB;
		if ((cflag&PARODD) == 0)
			cfcr |= CFCR_PEVEN;
	}
	if (cflag&CSTOPB)
		cfcr |= CFCR_STOPB;
	outb(com+com_cfcr, cfcr);

	if (com_hasfifo & (1 << unit))
		outb(com+com_fifo, FIFO_ENABLE | FIFO_TRIGGER_14);

	return(0);
}
 
void
comstart(tp)
	register struct tty *tp;
{
	register com;
	int s, unit, c;
 
	unit = UNIT(tp->t_dev);
	com = com_addr[unit];
	s = spltty();
	if (tp->t_state & (TS_TIMEOUT|TS_TTSTOP))
		goto out;
	if (tp->t_outq.c_cc <= tp->t_lowat) {
		if (tp->t_state&TS_ASLEEP) {
			tp->t_state &= ~TS_ASLEEP;
			wakeup((caddr_t)&tp->t_outq);
		}
		selwakeup(&tp->t_wsel);
	}
	if (tp->t_outq.c_cc == 0)
		goto out;
	if (inb(com+com_lsr) & LSR_TXRDY) {
		c = getc(&tp->t_outq);
		tp->t_state |= TS_BUSY;
		outb(com+com_data, c);
		if (com_hasfifo & (1 << unit))
			for (c = 1; c < 16 && tp->t_outq.c_cc; ++c)
				outb(com+com_data, getc(&tp->t_outq));
	}
out:
	splx(s);
}
 
/*
 * Stop output on a line.
 */
/*ARGSUSED*/
comstop(tp, flag)
	register struct tty *tp;
{
	register int s;

	s = spltty();
	if (tp->t_state & TS_BUSY) {
		if ((tp->t_state&TS_TTSTOP)==0)
			tp->t_state |= TS_FLUSH;
	}
	splx(s);
}
 
commctl(dev, bits, how)
	dev_t dev;
	int bits, how;
{
	register com;
	register int unit;
	int s;

	unit = UNIT(dev);
	com = com_addr[unit];
	s = spltty();
	switch (how) {

	case DMSET:
		outb(com+com_mcr, bits | MCR_IENABLE);
		break;

	case DMBIS:
		outb(com+com_mcr, inb(com+com_mcr) | bits | MCR_IENABLE);
		break;

	case DMBIC:
		outb(com+com_mcr, inb(com+com_mcr) & ~bits | MCR_IENABLE);
		break;

	case DMGET:
		bits = inb(com+com_msr);
		break;
	}
	(void) splx(s);
	return(bits);
}

/*
 * Following are all routines needed for COM to act as console
 */
#include "i386/i386/cons.h"

comcnprobe(cp)
	struct consdev *cp;
{
	int unit;

	/* locate the major number */
	for (commajor = 0; commajor < nchrdev; commajor++)
		if (cdevsw[commajor].d_open == comopen)
			break;

	/* XXX: ick */
	unit = CONUNIT;
	com_addr[CONUNIT] = CONADDR;

	/* make sure hardware exists?  XXX */

	/* initialize required fields */
	cp->cn_dev = makedev(commajor, unit);
	cp->cn_tp = &com_tty[unit];
#ifdef	COMCONSOLE
	cp->cn_pri = CN_REMOTE;		/* Force a serial port console */
#else
	cp->cn_pri = CN_NORMAL;
#endif
}

comcninit(cp)
	struct consdev *cp;
{
	int unit = UNIT(cp->cn_dev);

	cominit(unit, comdefaultrate);
	comconsole = unit;
	comconsinit = 1;
}

cominit(unit, rate)
	int unit, rate;
{
	register int com;
	int s;
	short stat;

#ifdef lint
	stat = unit; if (stat) return;
#endif
	com = com_addr[unit];
	s = splhigh();
	outb(com+com_cfcr, CFCR_DLAB);
	rate = ttspeedtab(comdefaultrate, comspeedtab);
	outb(com+com_data, rate & 0xFF);
	outb(com+com_ier, rate >> 8);
	outb(com+com_cfcr, CFCR_8BITS);
	outb(com+com_ier, IER_ERXRDY | IER_ETXRDY);
	outb(com+com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_14);
	stat = inb(com+com_iir);
	splx(s);
}

comcngetc(dev)
{
	register com = com_addr[UNIT(dev)];
	short stat;
	int c, s;

#ifdef lint
	stat = dev; if (stat) return(0);
#endif
	s = splhigh();
	while (((stat = inb(com+com_lsr)) & LSR_RXRDY) == 0)
		;
	c = inb(com+com_data);
	stat = inb(com+com_iir);
	splx(s);
	return(c);
}

/*
 * Console kernel output character routine.
 */
comcnputc(dev, c)
	dev_t dev;
	register int c;
{
	register com = com_addr[UNIT(dev)];
	register int timo;
	short stat;
	int s = splhigh();

#ifdef lint
	stat = dev; if (stat) return;
#endif
#ifdef KGDB
	if (dev != kgdb_dev)
#endif
	if (comconsinit == 0) {
		(void) cominit(UNIT(dev), comdefaultrate);
		comconsinit = 1;
	}
	/* wait for any pending transmission to finish */
	timo = 50000;
	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
		;
	outb(com+com_data, c);
	/* wait for this transmission to complete */
	timo = 1500000;
	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
		;
	/* clear any interrupts generated by this transmission */
	stat = inb(com+com_iir);
	splx(s);
}
#endif
Commit	Line	Data
3bf20cd8	1	/*-
54d5ccc6 WN	2	* Copyright (c) 1991 The Regents of the University of California.
54d5ccc6 WN	3	* All rights reserved.
3bf20cd8 WN	4	*
	5	* %sccs.include.redist.c%
	6	*
196af303	7	* @(#)com.c 7.7 (Berkeley) %G%
3bf20cd8 WN	8	*/
3bf20cd8 WN	9
17441d36 WN	10	#include "com.h"
17441d36 WN	11	#if NCOM > 0
3bf20cd8	12	/*
54d5ccc6 WN	13	* COM driver, based on HP dca driver
54d5ccc6 WN	14	* uses National Semiconductor NS16450/NS16550AF UART
3bf20cd8	15	*/
54d5ccc6 WN	16	#include "param.h"
	17	#include "systm.h"
	18	#include "ioctl.h"
	19	#include "tty.h"
	20	#include "proc.h"
	21	#include "user.h"
	22	#include "conf.h"
	23	#include "file.h"
	24	#include "uio.h"
	25	#include "kernel.h"
	26	#include "syslog.h"
3bf20cd8 WN	27
	28	#include "i386/isa/isa_device.h"
	29	#include "i386/isa/comreg.h"
54d5ccc6	30	#include "i386/isa/ic/ns16550.h"
3bf20cd8	31
196af303 KS	32	void comstart();
196af303 KS	33	int comprobe(), comattach(), comintr(), comparam();
3bf20cd8 WN	34
	35	struct isa_driver comdriver = {
	36	comprobe, comattach, "com"
	37	};
	38
	39	int comsoftCAR;
	40	int com_active;
54d5ccc6	41	int com_hasfifo;
17441d36	42	int ncom = NCOM;
54d5ccc6 WN	43	#ifdef COMCONSOLE
	44	int comconsole = COMCONSOLE;
	45	#else
3bf20cd8	46	int comconsole = -1;
54d5ccc6 WN	47	#endif
54d5ccc6 WN	48	int comconsinit;
3bf20cd8	49	int comdefaultrate = TTYDEF_SPEED;
54d5ccc6	50	int commajor;
17441d36 WN	51	short com_addr[NCOM];
17441d36 WN	52	struct tty com_tty[NCOM];
3bf20cd8 WN	53
	54	struct speedtab comspeedtab[] = {
	55	0, 0,
	56	50, COMBRD(50),
	57	75, COMBRD(75),
	58	110, COMBRD(110),
	59	134, COMBRD(134),
	60	150, COMBRD(150),
	61	200, COMBRD(200),
	62	300, COMBRD(300),
	63	600, COMBRD(600),
	64	1200, COMBRD(1200),
	65	1800, COMBRD(1800),
	66	2400, COMBRD(2400),
	67	4800, COMBRD(4800),
	68	9600, COMBRD(9600),
	69	19200, COMBRD(19200),
	70	38400, COMBRD(38400),
	71	57600, COMBRD(57600),
	72	-1, -1
	73	};
	74
	75	extern struct tty *constty;
	76	#ifdef KGDB
54d5ccc6 WN	77	#include "machine/remote-sl.h"
54d5ccc6 WN	78
3bf20cd8 WN	79	extern int kgdb_dev;
	80	extern int kgdb_rate;
	81	extern int kgdb_debug_init;
	82	#endif
	83
	84	#define UNIT(x) minor(x)
	85
	86	comprobe(dev)
	87	struct isa_device *dev;
	88	{
fcdc0869 WN	89	/* force access to id reg */
	90	outb(dev->id_iobase+com_cfcr, 0);
	91	outb(dev->id_iobase+com_iir, 0);
	92	if ((inb(dev->id_iobase+com_iir) & 0x38) == 0)
3bf20cd8	93	return(1);
54d5ccc6	94	return(1);
3bf20cd8 WN	95
	96	}
	97
	98
	99	int
	100	comattach(isdp)
	101	struct isa_device *isdp;
	102	{
	103	struct tty *tp;
	104	u_char unit;
	105	int port = isdp->id_iobase;
	106
54d5ccc6	107	unit = isdp->id_unit;
3bf20cd8 WN	108	if (unit == comconsole)
3bf20cd8 WN	109	DELAY(100000);
3bf20cd8 WN	110	com_addr[unit] = port;
3bf20cd8 WN	111	com_active \|= 1 << unit;
54d5ccc6 WN	112	comsoftCAR \|= 1 << unit; /* XXX */
	113
	114	/* look for a NS 16550AF UART with FIFOs */
	115	outb(port+com_fifo, FIFO_ENABLE\|FIFO_RCV_RST\|FIFO_XMT_RST\|FIFO_TRIGGER_14);
	116	DELAY(100);
	117	if ((inb(port+com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK)
	118	com_hasfifo \|= 1 << unit;
	119
3bf20cd8 WN	120	outb(port+com_ier, 0);
	121	outb(port+com_mcr, 0 \| MCR_IENABLE);
	122	#ifdef KGDB
fcdc0869	123	if (kgdb_dev == makedev(commajor, unit)) {
3bf20cd8 WN	124	if (comconsole == unit)
	125	kgdb_dev = -1; /* can't debug over console port */
	126	else {
54d5ccc6	127	(void) cominit(unit, kgdb_rate);
3bf20cd8	128	if (kgdb_debug_init) {
54d5ccc6 WN	129	/*
	130	* Print prefix of device name,
	131	* let kgdb_connect print the rest.
	132	*/
	133	printf("com%d: ", unit);
	134	kgdb_connect(1);
3bf20cd8 WN	135	} else
	136	printf("com%d: kgdb enabled\n", unit);
	137	}
	138	}
	139	#endif
	140	/*
54d5ccc6	141	* Need to reset baud rate, etc. of next print so reset comconsinit.
3bf20cd8 WN	142	* Also make sure console is always "hardwired"
	143	*/
	144	if (unit == comconsole) {
54d5ccc6	145	comconsinit = 0;
3bf20cd8 WN	146	comsoftCAR \|= (1 << unit);
3bf20cd8 WN	147	}
3bf20cd8 WN	148	return (1);
	149	}
	150
17441d36 WN	151	/* ARGSUSED */
	152	#ifdef __STDC__
	153	comopen(dev_t dev, int flag, int mode, struct proc *p)
	154	#else
	155	comopen(dev, flag, mode, p)
3bf20cd8	156	dev_t dev;
17441d36 WN	157	int flag, mode;
	158	struct proc *p;
	159	#endif
3bf20cd8 WN	160	{
	161	register struct tty *tp;
	162	register int unit;
	163	int error = 0;
	164
	165	unit = UNIT(dev);
17441d36	166	if (unit >= NCOM \|\| (com_active & (1 << unit)) == 0)
3bf20cd8 WN	167	return (ENXIO);
	168	tp = &com_tty[unit];
	169	tp->t_oproc = comstart;
	170	tp->t_param = comparam;
	171	tp->t_dev = dev;
	172	if ((tp->t_state & TS_ISOPEN) == 0) {
	173	tp->t_state \|= TS_WOPEN;
	174	ttychars(tp);
54d5ccc6 WN	175	if (tp->t_ispeed == 0) {
	176	tp->t_iflag = TTYDEF_IFLAG;
	177	tp->t_oflag = TTYDEF_OFLAG;
	178	tp->t_cflag = TTYDEF_CFLAG;
	179	tp->t_lflag = TTYDEF_LFLAG;
	180	tp->t_ispeed = tp->t_ospeed = comdefaultrate;
	181	}
3bf20cd8 WN	182	comparam(tp, &tp->t_termios);
3bf20cd8 WN	183	ttsetwater(tp);
17441d36	184	} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
3bf20cd8 WN	185	return (EBUSY);
	186	(void) spltty();
	187	(void) commctl(dev, MCR_DTR \| MCR_RTS, DMSET);
	188	if ((comsoftCAR & (1 << unit)) \|\| (commctl(dev, 0, DMGET) & MSR_DCD))
	189	tp->t_state \|= TS_CARR_ON;
	190	while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
	191	(tp->t_state & TS_CARR_ON) == 0) {
	192	tp->t_state \|= TS_WOPEN;
	193	if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI \| PCATCH,
	194	ttopen, 0))
	195	break;
	196	}
	197	(void) spl0();
	198	if (error == 0)
	199	error = (*linesw[tp->t_line].l_open)(dev, tp);
	200	return (error);
	201	}
	202
	203	/ARGSUSED/
f9208832	204	comclose(dev, flag, mode, p)
3bf20cd8	205	dev_t dev;
f9208832 MT	206	int flag, mode;
f9208832 MT	207	struct proc *p;
3bf20cd8 WN	208	{
	209	register struct tty *tp;
	210	register com;
	211	register int unit;
	212
	213	unit = UNIT(dev);
	214	com = com_addr[unit];
	215	tp = &com_tty[unit];
f9208832	216	(*linesw[tp->t_line].l_close)(tp, flag);
3bf20cd8 WN	217	outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
	218	#ifdef KGDB
	219	/* do not disable interrupts if debugging */
54d5ccc6	220	if (kgdb_dev != makedev(commajor, unit))
3bf20cd8 WN	221	#endif
	222	outb(com+com_ier, 0);
	223	if (tp->t_cflag&HUPCL \|\| tp->t_state&TS_WOPEN \|\|
	224	(tp->t_state&TS_ISOPEN) == 0)
	225	(void) commctl(dev, 0, DMSET);
	226	ttyclose(tp);
	227	return(0);
	228	}
	229
	230	comread(dev, uio, flag)
	231	dev_t dev;
	232	struct uio *uio;
	233	{
	234	register struct tty *tp = &com_tty[UNIT(dev)];
	235
	236	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
	237	}
	238
	239	comwrite(dev, uio, flag)
	240	dev_t dev;
	241	struct uio *uio;
	242	{
	243	int unit = UNIT(dev);
	244	register struct tty *tp = &com_tty[unit];
	245
3bf20cd8 WN	246	/*
	247	* (XXX) We disallow virtual consoles if the physical console is
	248	* a serial port. This is in case there is a display attached that
	249	* is not the console. In that situation we don't need/want the X
	250	* server taking over the console.
	251	*/
	252	if (constty && unit == comconsole)
	253	constty = NULL;
3bf20cd8 WN	254	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
	255	}
	256
	257	comintr(unit)
	258	register int unit;
	259	{
	260	register com;
	261	register u_char code;
	262	register struct tty *tp;
	263
	264	com = com_addr[unit];
	265	while (1) {
	266	code = inb(com+com_iir);
54d5ccc6	267	switch (code & IIR_IMASK) {
3bf20cd8 WN	268	case IIR_NOPEND:
3bf20cd8 WN	269	return (1);
54d5ccc6	270	case IIR_RXTOUT:
3bf20cd8	271	case IIR_RXRDY:
3bf20cd8	272	tp = &com_tty[unit];
54d5ccc6 WN	273	/*
	274	* Process received bytes. Inline for speed...
	275	*/
3bf20cd8	276	#ifdef KGDB
54d5ccc6 WN	277	#define RCVBYTE() \
	278	code = inb(com+com_data); \
	279	if ((tp->t_state & TS_ISOPEN) == 0) { \
	280	if (kgdb_dev == makedev(commajor, unit) && \
	281	code == FRAME_END) \
	282	kgdb_connect(0); /* trap into kgdb */ \
	283	} else \
	284	(*linesw[tp->t_line].l_rint)(code, tp)
	285	#else
	286	#define RCVBYTE() \
	287	code = inb(com+com_data); \
	288	if (tp->t_state & TS_ISOPEN) \
	289	(*linesw[tp->t_line].l_rint)(code, tp)
3bf20cd8	290	#endif
54d5ccc6 WN	291
	292	RCVBYTE();
	293
	294	if (com_hasfifo & (1 << unit))
	295	while ((code = inb(com+com_lsr)) & LSR_RCV_MASK) {
	296	if (code == LSR_RXRDY) {
	297	RCVBYTE();
	298	} else
	299	comeint(unit, code, com);
	300	}
3bf20cd8 WN	301	break;
	302	case IIR_TXRDY:
	303	tp = &com_tty[unit];
	304	tp->t_state &=~ (TS_BUSY\|TS_FLUSH);
	305	if (tp->t_line)
	306	(*linesw[tp->t_line].l_start)(tp);
	307	else
	308	comstart(tp);
	309	break;
	310	case IIR_RLS:
54d5ccc6	311	comeint(unit, inb(com+com_lsr), com);
3bf20cd8 WN	312	break;
	313	default:
	314	if (code & IIR_NOPEND)
	315	return (1);
	316	log(LOG_WARNING, "com%d: weird interrupt: 0x%x\n",
	317	unit, code);
	318	/* fall through */
	319	case IIR_MLSC:
	320	commint(unit, com);
	321	break;
	322	}
	323	}
	324	}
	325
54d5ccc6 WN	326	comeint(unit, stat, com)
54d5ccc6 WN	327	register int unit, stat;
3bf20cd8 WN	328	register com;
	329	{
	330	register struct tty *tp;
54d5ccc6	331	register int c;
3bf20cd8 WN	332
3bf20cd8 WN	333	tp = &com_tty[unit];
3bf20cd8 WN	334	c = inb(com+com_data);
	335	if ((tp->t_state & TS_ISOPEN) == 0) {
	336	#ifdef KGDB
	337	/* we don't care about parity errors */
	338	if (((stat & (LSR_BI\|LSR_FE\|LSR_PE)) == LSR_PE) &&
54d5ccc6 WN	339	kgdb_dev == makedev(commajor, unit) && c == FRAME_END)
54d5ccc6 WN	340	kgdb_connect(0); /* trap into kgdb */
3bf20cd8 WN	341	#endif
	342	return;
	343	}
	344	if (stat & (LSR_BI \| LSR_FE))
	345	c \|= TTY_FE;
	346	else if (stat & LSR_PE)
	347	c \|= TTY_PE;
	348	else if (stat & LSR_OE)
	349	log(LOG_WARNING, "com%d: silo overflow\n", unit);
	350	(*linesw[tp->t_line].l_rint)(c, tp);
	351	}
	352
	353	commint(unit, com)
	354	register int unit;
	355	register com;
	356	{
	357	register struct tty *tp;
	358	register int stat;
	359
	360	tp = &com_tty[unit];
	361	stat = inb(com+com_msr);
	362	if ((stat & MSR_DDCD) && (comsoftCAR & (1 << unit)) == 0) {
	363	if (stat & MSR_DCD)
	364	(void)(*linesw[tp->t_line].l_modem)(tp, 1);
	365	else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0)
	366	outb(com+com_mcr,
	367	inb(com+com_mcr) & ~(MCR_DTR \| MCR_RTS) \| MCR_IENABLE);
	368	} else if ((stat & MSR_DCTS) && (tp->t_state & TS_ISOPEN) &&
	369	(tp->t_flags & CRTSCTS)) {
	370	/* the line is up and we want to do rts/cts flow control */
	371	if (stat & MSR_CTS) {
	372	tp->t_state &=~ TS_TTSTOP;
	373	ttstart(tp);
	374	} else
	375	tp->t_state \|= TS_TTSTOP;
	376	}
	377	}
	378
196af303	379	comioctl(dev, cmd, data, flag, p)
3bf20cd8	380	dev_t dev;
196af303	381	int cmd, flag;
3bf20cd8	382	caddr_t data;
196af303	383	struct proc *p;
3bf20cd8 WN	384	{
	385	register struct tty *tp;
	386	register int unit = UNIT(dev);
	387	register com;
	388	register int error;
	389
	390	tp = &com_tty[unit];
196af303	391	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
3bf20cd8 WN	392	if (error >= 0)
	393	return (error);
	394	error = ttioctl(tp, cmd, data, flag);
	395	if (error >= 0)
	396	return (error);
	397
	398	com = com_addr[unit];
	399	switch (cmd) {
	400
	401	case TIOCSBRK:
	402	outb(com+com_cfcr, inb(com+com_cfcr) \| CFCR_SBREAK);
	403	break;
	404
	405	case TIOCCBRK:
	406	outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
	407	break;
	408
	409	case TIOCSDTR:
	410	(void) commctl(dev, MCR_DTR \| MCR_RTS, DMBIS);
	411	break;
	412
	413	case TIOCCDTR:
	414	(void) commctl(dev, MCR_DTR \| MCR_RTS, DMBIC);
	415	break;
	416
	417	case TIOCMSET:
	418	(void) commctl(dev, (int )data, DMSET);
	419	break;
	420
	421	case TIOCMBIS:
	422	(void) commctl(dev, (int )data, DMBIS);
	423	break;
	424
	425	case TIOCMBIC:
	426	(void) commctl(dev, (int )data, DMBIC);
	427	break;
	428
	429	case TIOCMGET:
	430	(int )data = commctl(dev, 0, DMGET);
	431	break;
	432
	433	default:
	434	return (ENOTTY);
	435	}
	436	return (0);
	437	}
	438
	439	comparam(tp, t)
	440	register struct tty *tp;
	441	register struct termios *t;
	442	{
	443	register com;
	444	register int cfcr, cflag = t->c_cflag;
	445	int unit = UNIT(tp->t_dev);
	446	int ospeed = ttspeedtab(t->c_ospeed, comspeedtab);
	447
	448	/* check requested parameters */
	449	if (ospeed < 0 \|\| (t->c_ispeed && t->c_ispeed != t->c_ospeed))
	450	return(EINVAL);
	451	/* and copy to tty */
	452	tp->t_ispeed = t->c_ispeed;
	453	tp->t_ospeed = t->c_ospeed;
	454	tp->t_cflag = cflag;
	455
456	com = com_addr[unit];
457	outb(com+com_ier, IER_ERXRDY \| IER_ETXRDY \| IER_ERLS /\| IER_EMSC/);
458	if (ospeed == 0) {
459	(void) commctl(unit, 0, DMSET); /* hang up line */
460	return(0);
461	}
462	outb(com+com_cfcr, inb(com+com_cfcr) \| CFCR_DLAB);
463	outb(com+com_data, ospeed & 0xFF);
464	outb(com+com_ier, ospeed >> 8);
465	switch (cflag&CSIZE) {
466	case CS5:
467	cfcr = CFCR_5BITS; break;
468	case CS6:
469	cfcr = CFCR_6BITS; break;
470	case CS7:
471	cfcr = CFCR_7BITS; break;
472	case CS8:
473	cfcr = CFCR_8BITS; break;
474	}
475	if (cflag&PARENB) {
476	cfcr \|= CFCR_PENAB;
477	if ((cflag&PARODD) == 0)
478	cfcr \|= CFCR_PEVEN;
479	}
480	if (cflag&CSTOPB)
481	cfcr \|= CFCR_STOPB;
482	outb(com+com_cfcr, cfcr);
54d5ccc6 WN	483
	484	if (com_hasfifo & (1 << unit))
	485	outb(com+com_fifo, FIFO_ENABLE \| FIFO_TRIGGER_14);
	486
3bf20cd8 WN	487	return(0);
	488	}
	489
196af303	490	void
3bf20cd8 WN	491	comstart(tp)
	492	register struct tty *tp;
	493	{
	494	register com;
	495	int s, unit, c;
	496
	497	unit = UNIT(tp->t_dev);
	498	com = com_addr[unit];
	499	s = spltty();
	500	if (tp->t_state & (TS_TIMEOUT\|TS_TTSTOP))
	501	goto out;
	502	if (tp->t_outq.c_cc <= tp->t_lowat) {
	503	if (tp->t_state&TS_ASLEEP) {
	504	tp->t_state &= ~TS_ASLEEP;
	505	wakeup((caddr_t)&tp->t_outq);
	506	}
e3f0eb64	507	selwakeup(&tp->t_wsel);
3bf20cd8 WN	508	}
	509	if (tp->t_outq.c_cc == 0)
	510	goto out;
	511	if (inb(com+com_lsr) & LSR_TXRDY) {
	512	c = getc(&tp->t_outq);
	513	tp->t_state \|= TS_BUSY;
	514	outb(com+com_data, c);
54d5ccc6 WN	515	if (com_hasfifo & (1 << unit))
	516	for (c = 1; c < 16 && tp->t_outq.c_cc; ++c)
	517	outb(com+com_data, getc(&tp->t_outq));
3bf20cd8 WN	518	}
	519	out:
	520	splx(s);
	521	}
	522
	523	/*
	524	* Stop output on a line.
	525	*/
	526	/ARGSUSED/
	527	comstop(tp, flag)
	528	register struct tty *tp;
	529	{
	530	register int s;
	531
	532	s = spltty();
	533	if (tp->t_state & TS_BUSY) {
	534	if ((tp->t_state&TS_TTSTOP)==0)
	535	tp->t_state \|= TS_FLUSH;
	536	}
	537	splx(s);
	538	}
	539
	540	commctl(dev, bits, how)
	541	dev_t dev;
	542	int bits, how;
	543	{
	544	register com;
	545	register int unit;
	546	int s;
	547
	548	unit = UNIT(dev);
	549	com = com_addr[unit];
	550	s = spltty();
	551	switch (how) {
	552
	553	case DMSET:
	554	outb(com+com_mcr, bits \| MCR_IENABLE);
	555	break;
	556
	557	case DMBIS:
	558	outb(com+com_mcr, inb(com+com_mcr) \| bits \| MCR_IENABLE);
	559	break;
	560
	561	case DMBIC:
	562	outb(com+com_mcr, inb(com+com_mcr) & ~bits \| MCR_IENABLE);
	563	break;
	564
	565	case DMGET:
	566	bits = inb(com+com_msr);
	567	break;
	568	}
	569	(void) splx(s);
	570	return(bits);
	571	}
54d5ccc6 WN	572
	573	/*
	574	* Following are all routines needed for COM to act as console
	575	*/
	576	#include "i386/i386/cons.h"
	577
	578	comcnprobe(cp)
	579	struct consdev *cp;
	580	{
	581	int unit;
54d5ccc6 WN	582
	583	/* locate the major number */
	584	for (commajor = 0; commajor < nchrdev; commajor++)
	585	if (cdevsw[commajor].d_open == comopen)
	586	break;
	587
	588	/* XXX: ick */
	589	unit = CONUNIT;
	590	com_addr[CONUNIT] = CONADDR;
	591
	592	/* make sure hardware exists? XXX */
	593
	594	/* initialize required fields */
	595	cp->cn_dev = makedev(commajor, unit);
	596	cp->cn_tp = &com_tty[unit];
	597	#ifdef COMCONSOLE
	598	cp->cn_pri = CN_REMOTE; /* Force a serial port console */
	599	#else
	600	cp->cn_pri = CN_NORMAL;
	601	#endif
	602	}
	603
	604	comcninit(cp)
	605	struct consdev *cp;
	606	{
	607	int unit = UNIT(cp->cn_dev);
	608
	609	cominit(unit, comdefaultrate);
	610	comconsole = unit;
	611	comconsinit = 1;
	612	}
	613
	614	cominit(unit, rate)
	615	int unit, rate;
	616	{
	617	register int com;
	618	int s;
	619	short stat;
	620
	621	#ifdef lint
	622	stat = unit; if (stat) return;
	623	#endif
	624	com = com_addr[unit];
	625	s = splhigh();
	626	outb(com+com_cfcr, CFCR_DLAB);
	627	rate = ttspeedtab(comdefaultrate, comspeedtab);
	628	outb(com+com_data, rate & 0xFF);
	629	outb(com+com_ier, rate >> 8);
	630	outb(com+com_cfcr, CFCR_8BITS);
	631	outb(com+com_ier, IER_ERXRDY \| IER_ETXRDY);
	632	outb(com+com_fifo, FIFO_ENABLE\|FIFO_RCV_RST\|FIFO_XMT_RST\|FIFO_TRIGGER_14);
	633	stat = inb(com+com_iir);
	634	splx(s);
	635	}
	636
	637	comcngetc(dev)
	638	{
	639	register com = com_addr[UNIT(dev)];
	640	short stat;
	641	int c, s;
	642
	643	#ifdef lint
	644	stat = dev; if (stat) return(0);
	645	#endif
646	s = splhigh();
647	while (((stat = inb(com+com_lsr)) & LSR_RXRDY) == 0)
648	;
649	c = inb(com+com_data);
650	stat = inb(com+com_iir);
651	splx(s);
652	return(c);
653	}
654
655	/*
656	* Console kernel output character routine.
657	*/
658	comcnputc(dev, c)
659	dev_t dev;
660	register int c;
661	{
662	register com = com_addr[UNIT(dev)];
663	register int timo;
664	short stat;
665	int s = splhigh();
666
667	#ifdef lint
668	stat = dev; if (stat) return;
669	#endif
670	#ifdef KGDB
671	if (dev != kgdb_dev)
672	#endif
673	if (comconsinit == 0) {
674	(void) cominit(UNIT(dev), comdefaultrate);
675	comconsinit = 1;
676	}
677	/* wait for any pending transmission to finish */
678	timo = 50000;
679	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
680	;
681	outb(com+com_data, c);
682	/* wait for this transmission to complete */
683	timo = 1500000;
684	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
685	;
686	/* clear any interrupts generated by this transmission */
687	stat = inb(com+com_iir);
688	splx(s);
689	}
3bf20cd8	690	#endif