[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	7.3 (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"

int 	comprobe(), comattach(), comintr(), comstart(), 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;
{
	/*if ((inb(dev->id_iobase+com_iir) & 0x38) == 0)
		return(1);
printf("base %x val %x ", dev->id_iobase,
	inb(dev->id_iobase+com_iir));*/
	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 (1/*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)
	dev_t dev;
{
	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);
	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)
	dev_t dev;
	caddr_t data;
{
	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);
	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);
}
 
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);
		}
		if (tp->t_wsel) {
			selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
			tp->t_wsel = 0;
			tp->t_state &= ~TS_WCOLL;
		}
	}
	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;
	extern int comopen();

	/* 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	*
54d5ccc6	7	* @(#)com.c 7.3 (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 WN	31
	32	int comprobe(), comattach(), comintr(), comstart(), comparam();
	33
	34	struct isa_driver comdriver = {
	35	comprobe, comattach, "com"
	36	};
	37
	38	int comsoftCAR;
	39	int com_active;
54d5ccc6	40	int com_hasfifo;
17441d36	41	int ncom = NCOM;
54d5ccc6 WN	42	#ifdef COMCONSOLE
	43	int comconsole = COMCONSOLE;
	44	#else
3bf20cd8	45	int comconsole = -1;
54d5ccc6 WN	46	#endif
54d5ccc6 WN	47	int comconsinit;
3bf20cd8	48	int comdefaultrate = TTYDEF_SPEED;
54d5ccc6	49	int commajor;
17441d36 WN	50	short com_addr[NCOM];
17441d36 WN	51	struct tty com_tty[NCOM];
3bf20cd8 WN	52
	53	struct speedtab comspeedtab[] = {
	54	0, 0,
	55	50, COMBRD(50),
	56	75, COMBRD(75),
	57	110, COMBRD(110),
	58	134, COMBRD(134),
	59	150, COMBRD(150),
	60	200, COMBRD(200),
	61	300, COMBRD(300),
	62	600, COMBRD(600),
	63	1200, COMBRD(1200),
	64	1800, COMBRD(1800),
	65	2400, COMBRD(2400),
	66	4800, COMBRD(4800),
	67	9600, COMBRD(9600),
	68	19200, COMBRD(19200),
	69	38400, COMBRD(38400),
	70	57600, COMBRD(57600),
	71	-1, -1
	72	};
	73
	74	extern struct tty *constty;
	75	#ifdef KGDB
54d5ccc6 WN	76	#include "machine/remote-sl.h"
54d5ccc6 WN	77
3bf20cd8 WN	78	extern int kgdb_dev;
	79	extern int kgdb_rate;
	80	extern int kgdb_debug_init;
	81	#endif
	82
	83	#define UNIT(x) minor(x)
	84
	85	comprobe(dev)
	86	struct isa_device *dev;
	87	{
54d5ccc6	88	/*if ((inb(dev->id_iobase+com_iir) & 0x38) == 0)
3bf20cd8	89	return(1);
54d5ccc6 WN	90	printf("base %x val %x ", dev->id_iobase,
	91	inb(dev->id_iobase+com_iir));*/
	92	return(1);
3bf20cd8 WN	93
	94	}
	95
	96
	97	int
	98	comattach(isdp)
	99	struct isa_device *isdp;
	100	{
	101	struct tty *tp;
	102	u_char unit;
	103	int port = isdp->id_iobase;
	104
54d5ccc6	105	unit = isdp->id_unit;
3bf20cd8 WN	106	if (unit == comconsole)
3bf20cd8 WN	107	DELAY(100000);
3bf20cd8 WN	108	com_addr[unit] = port;
3bf20cd8 WN	109	com_active \|= 1 << unit;
54d5ccc6 WN	110	comsoftCAR \|= 1 << unit; /* XXX */
	111
	112	/* look for a NS 16550AF UART with FIFOs */
	113	outb(port+com_fifo, FIFO_ENABLE\|FIFO_RCV_RST\|FIFO_XMT_RST\|FIFO_TRIGGER_14);
	114	DELAY(100);
	115	if ((inb(port+com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK)
	116	com_hasfifo \|= 1 << unit;
	117
3bf20cd8 WN	118	outb(port+com_ier, 0);
	119	outb(port+com_mcr, 0 \| MCR_IENABLE);
	120	#ifdef KGDB
54d5ccc6	121	if (1/kgdb_dev == makedev(commajor, unit)/) {
3bf20cd8 WN	122	if (comconsole == unit)
	123	kgdb_dev = -1; /* can't debug over console port */
	124	else {
54d5ccc6	125	(void) cominit(unit, kgdb_rate);
3bf20cd8	126	if (kgdb_debug_init) {
54d5ccc6 WN	127	/*
	128	* Print prefix of device name,
	129	* let kgdb_connect print the rest.
	130	*/
	131	printf("com%d: ", unit);
	132	kgdb_connect(1);
3bf20cd8 WN	133	} else
	134	printf("com%d: kgdb enabled\n", unit);
	135	}
	136	}
	137	#endif
	138	/*
54d5ccc6	139	* Need to reset baud rate, etc. of next print so reset comconsinit.
3bf20cd8 WN	140	* Also make sure console is always "hardwired"
	141	*/
	142	if (unit == comconsole) {
54d5ccc6	143	comconsinit = 0;
3bf20cd8 WN	144	comsoftCAR \|= (1 << unit);
3bf20cd8 WN	145	}
3bf20cd8 WN	146	return (1);
	147	}
	148
17441d36 WN	149	/* ARGSUSED */
	150	#ifdef __STDC__
	151	comopen(dev_t dev, int flag, int mode, struct proc *p)
	152	#else
	153	comopen(dev, flag, mode, p)
3bf20cd8	154	dev_t dev;
17441d36 WN	155	int flag, mode;
	156	struct proc *p;
	157	#endif
3bf20cd8 WN	158	{
	159	register struct tty *tp;
	160	register int unit;
	161	int error = 0;
	162
	163	unit = UNIT(dev);
17441d36	164	if (unit >= NCOM \|\| (com_active & (1 << unit)) == 0)
3bf20cd8 WN	165	return (ENXIO);
	166	tp = &com_tty[unit];
	167	tp->t_oproc = comstart;
	168	tp->t_param = comparam;
	169	tp->t_dev = dev;
	170	if ((tp->t_state & TS_ISOPEN) == 0) {
	171	tp->t_state \|= TS_WOPEN;
	172	ttychars(tp);
54d5ccc6 WN	173	if (tp->t_ispeed == 0) {
	174	tp->t_iflag = TTYDEF_IFLAG;
	175	tp->t_oflag = TTYDEF_OFLAG;
	176	tp->t_cflag = TTYDEF_CFLAG;
	177	tp->t_lflag = TTYDEF_LFLAG;
	178	tp->t_ispeed = tp->t_ospeed = comdefaultrate;
	179	}
3bf20cd8 WN	180	comparam(tp, &tp->t_termios);
3bf20cd8 WN	181	ttsetwater(tp);
17441d36	182	} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
3bf20cd8 WN	183	return (EBUSY);
	184	(void) spltty();
	185	(void) commctl(dev, MCR_DTR \| MCR_RTS, DMSET);
	186	if ((comsoftCAR & (1 << unit)) \|\| (commctl(dev, 0, DMGET) & MSR_DCD))
	187	tp->t_state \|= TS_CARR_ON;
	188	while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
	189	(tp->t_state & TS_CARR_ON) == 0) {
	190	tp->t_state \|= TS_WOPEN;
	191	if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI \| PCATCH,
	192	ttopen, 0))
	193	break;
	194	}
	195	(void) spl0();
	196	if (error == 0)
	197	error = (*linesw[tp->t_line].l_open)(dev, tp);
	198	return (error);
	199	}
	200
	201	/ARGSUSED/
	202	comclose(dev, flag)
	203	dev_t dev;
	204	{
	205	register struct tty *tp;
	206	register com;
	207	register int unit;
	208
	209	unit = UNIT(dev);
	210	com = com_addr[unit];
	211	tp = &com_tty[unit];
	212	(*linesw[tp->t_line].l_close)(tp);
	213	outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
	214	#ifdef KGDB
	215	/* do not disable interrupts if debugging */
54d5ccc6	216	if (kgdb_dev != makedev(commajor, unit))
3bf20cd8 WN	217	#endif
	218	outb(com+com_ier, 0);
	219	if (tp->t_cflag&HUPCL \|\| tp->t_state&TS_WOPEN \|\|
	220	(tp->t_state&TS_ISOPEN) == 0)
	221	(void) commctl(dev, 0, DMSET);
	222	ttyclose(tp);
	223	return(0);
	224	}
	225
	226	comread(dev, uio, flag)
	227	dev_t dev;
	228	struct uio *uio;
	229	{
	230	register struct tty *tp = &com_tty[UNIT(dev)];
	231
	232	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
	233	}
	234
	235	comwrite(dev, uio, flag)
	236	dev_t dev;
	237	struct uio *uio;
	238	{
	239	int unit = UNIT(dev);
	240	register struct tty *tp = &com_tty[unit];
	241
3bf20cd8 WN	242	/*
	243	* (XXX) We disallow virtual consoles if the physical console is
	244	* a serial port. This is in case there is a display attached that
	245	* is not the console. In that situation we don't need/want the X
	246	* server taking over the console.
	247	*/
	248	if (constty && unit == comconsole)
	249	constty = NULL;
3bf20cd8 WN	250	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
	251	}
	252
	253	comintr(unit)
	254	register int unit;
	255	{
	256	register com;
	257	register u_char code;
	258	register struct tty *tp;
	259
	260	com = com_addr[unit];
	261	while (1) {
	262	code = inb(com+com_iir);
54d5ccc6	263	switch (code & IIR_IMASK) {
3bf20cd8 WN	264	case IIR_NOPEND:
3bf20cd8 WN	265	return (1);
54d5ccc6	266	case IIR_RXTOUT:
3bf20cd8	267	case IIR_RXRDY:
3bf20cd8	268	tp = &com_tty[unit];
54d5ccc6 WN	269	/*
	270	* Process received bytes. Inline for speed...
	271	*/
3bf20cd8	272	#ifdef KGDB
54d5ccc6 WN	273	#define RCVBYTE() \
	274	code = inb(com+com_data); \
	275	if ((tp->t_state & TS_ISOPEN) == 0) { \
	276	if (kgdb_dev == makedev(commajor, unit) && \
	277	code == FRAME_END) \
	278	kgdb_connect(0); /* trap into kgdb */ \
	279	} else \
	280	(*linesw[tp->t_line].l_rint)(code, tp)
	281	#else
	282	#define RCVBYTE() \
	283	code = inb(com+com_data); \
	284	if (tp->t_state & TS_ISOPEN) \
	285	(*linesw[tp->t_line].l_rint)(code, tp)
3bf20cd8	286	#endif
54d5ccc6 WN	287
	288	RCVBYTE();
	289
	290	if (com_hasfifo & (1 << unit))
	291	while ((code = inb(com+com_lsr)) & LSR_RCV_MASK) {
	292	if (code == LSR_RXRDY) {
	293	RCVBYTE();
	294	} else
	295	comeint(unit, code, com);
	296	}
3bf20cd8 WN	297	break;
	298	case IIR_TXRDY:
	299	tp = &com_tty[unit];
	300	tp->t_state &=~ (TS_BUSY\|TS_FLUSH);
	301	if (tp->t_line)
	302	(*linesw[tp->t_line].l_start)(tp);
	303	else
	304	comstart(tp);
	305	break;
	306	case IIR_RLS:
54d5ccc6	307	comeint(unit, inb(com+com_lsr), com);
3bf20cd8 WN	308	break;
	309	default:
	310	if (code & IIR_NOPEND)
	311	return (1);
	312	log(LOG_WARNING, "com%d: weird interrupt: 0x%x\n",
	313	unit, code);
	314	/* fall through */
	315	case IIR_MLSC:
	316	commint(unit, com);
	317	break;
	318	}
	319	}
	320	}
	321
54d5ccc6 WN	322	comeint(unit, stat, com)
54d5ccc6 WN	323	register int unit, stat;
3bf20cd8 WN	324	register com;
	325	{
	326	register struct tty *tp;
54d5ccc6	327	register int c;
3bf20cd8 WN	328
3bf20cd8 WN	329	tp = &com_tty[unit];
3bf20cd8 WN	330	c = inb(com+com_data);
	331	if ((tp->t_state & TS_ISOPEN) == 0) {
	332	#ifdef KGDB
	333	/* we don't care about parity errors */
	334	if (((stat & (LSR_BI\|LSR_FE\|LSR_PE)) == LSR_PE) &&
54d5ccc6 WN	335	kgdb_dev == makedev(commajor, unit) && c == FRAME_END)
54d5ccc6 WN	336	kgdb_connect(0); /* trap into kgdb */
3bf20cd8 WN	337	#endif
	338	return;
	339	}
	340	if (stat & (LSR_BI \| LSR_FE))
	341	c \|= TTY_FE;
	342	else if (stat & LSR_PE)
	343	c \|= TTY_PE;
	344	else if (stat & LSR_OE)
	345	log(LOG_WARNING, "com%d: silo overflow\n", unit);
	346	(*linesw[tp->t_line].l_rint)(c, tp);
	347	}
	348
	349	commint(unit, com)
	350	register int unit;
	351	register com;
	352	{
	353	register struct tty *tp;
	354	register int stat;
	355
	356	tp = &com_tty[unit];
	357	stat = inb(com+com_msr);
	358	if ((stat & MSR_DDCD) && (comsoftCAR & (1 << unit)) == 0) {
	359	if (stat & MSR_DCD)
	360	(void)(*linesw[tp->t_line].l_modem)(tp, 1);
	361	else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0)
	362	outb(com+com_mcr,
	363	inb(com+com_mcr) & ~(MCR_DTR \| MCR_RTS) \| MCR_IENABLE);
	364	} else if ((stat & MSR_DCTS) && (tp->t_state & TS_ISOPEN) &&
	365	(tp->t_flags & CRTSCTS)) {
	366	/* the line is up and we want to do rts/cts flow control */
	367	if (stat & MSR_CTS) {
	368	tp->t_state &=~ TS_TTSTOP;
	369	ttstart(tp);
	370	} else
	371	tp->t_state \|= TS_TTSTOP;
	372	}
	373	}
	374
	375	comioctl(dev, cmd, data, flag)
	376	dev_t dev;
	377	caddr_t data;
	378	{
	379	register struct tty *tp;
	380	register int unit = UNIT(dev);
	381	register com;
	382	register int error;
	383
	384	tp = &com_tty[unit];
	385	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
	386	if (error >= 0)
	387	return (error);
	388	error = ttioctl(tp, cmd, data, flag);
	389	if (error >= 0)
	390	return (error);
	391
	392	com = com_addr[unit];
	393	switch (cmd) {
	394
	395	case TIOCSBRK:
	396	outb(com+com_cfcr, inb(com+com_cfcr) \| CFCR_SBREAK);
	397	break;
	398
	399	case TIOCCBRK:
	400	outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
401	break;
402
403	case TIOCSDTR:
404	(void) commctl(dev, MCR_DTR \| MCR_RTS, DMBIS);
405	break;
406
407	case TIOCCDTR:
408	(void) commctl(dev, MCR_DTR \| MCR_RTS, DMBIC);
409	break;
410
411	case TIOCMSET:
412	(void) commctl(dev, (int )data, DMSET);
413	break;
414
415	case TIOCMBIS:
416	(void) commctl(dev, (int )data, DMBIS);
417	break;
418
419	case TIOCMBIC:
420	(void) commctl(dev, (int )data, DMBIC);
421	break;
422
423	case TIOCMGET:
424	(int )data = commctl(dev, 0, DMGET);
425	break;
426
427	default:
428	return (ENOTTY);
429	}
430	return (0);
431	}
432
433	comparam(tp, t)
434	register struct tty *tp;
435	register struct termios *t;
436	{
437	register com;
438	register int cfcr, cflag = t->c_cflag;
439	int unit = UNIT(tp->t_dev);
440	int ospeed = ttspeedtab(t->c_ospeed, comspeedtab);
441
442	/* check requested parameters */
443	if (ospeed < 0 \|\| (t->c_ispeed && t->c_ispeed != t->c_ospeed))
444	return(EINVAL);
445	/* and copy to tty */
446	tp->t_ispeed = t->c_ispeed;
447	tp->t_ospeed = t->c_ospeed;
448	tp->t_cflag = cflag;
449
450	com = com_addr[unit];
451	outb(com+com_ier, IER_ERXRDY \| IER_ETXRDY \| IER_ERLS /\| IER_EMSC/);
452	if (ospeed == 0) {
453	(void) commctl(unit, 0, DMSET); /* hang up line */
454	return(0);
455	}
456	outb(com+com_cfcr, inb(com+com_cfcr) \| CFCR_DLAB);
457	outb(com+com_data, ospeed & 0xFF);
458	outb(com+com_ier, ospeed >> 8);
459	switch (cflag&CSIZE) {
460	case CS5:
461	cfcr = CFCR_5BITS; break;
462	case CS6:
463	cfcr = CFCR_6BITS; break;
464	case CS7:
465	cfcr = CFCR_7BITS; break;
466	case CS8:
467	cfcr = CFCR_8BITS; break;
468	}
469	if (cflag&PARENB) {
470	cfcr \|= CFCR_PENAB;
471	if ((cflag&PARODD) == 0)
472	cfcr \|= CFCR_PEVEN;
473	}
474	if (cflag&CSTOPB)
475	cfcr \|= CFCR_STOPB;
476	outb(com+com_cfcr, cfcr);
54d5ccc6 WN	477
	478	if (com_hasfifo & (1 << unit))
	479	outb(com+com_fifo, FIFO_ENABLE \| FIFO_TRIGGER_14);
	480
3bf20cd8 WN	481	return(0);
	482	}
	483
	484	comstart(tp)
	485	register struct tty *tp;
	486	{
	487	register com;
	488	int s, unit, c;
	489
	490	unit = UNIT(tp->t_dev);
	491	com = com_addr[unit];
	492	s = spltty();
	493	if (tp->t_state & (TS_TIMEOUT\|TS_TTSTOP))
	494	goto out;
	495	if (tp->t_outq.c_cc <= tp->t_lowat) {
	496	if (tp->t_state&TS_ASLEEP) {
	497	tp->t_state &= ~TS_ASLEEP;
	498	wakeup((caddr_t)&tp->t_outq);
	499	}
	500	if (tp->t_wsel) {
	501	selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
	502	tp->t_wsel = 0;
	503	tp->t_state &= ~TS_WCOLL;
	504	}
	505	}
	506	if (tp->t_outq.c_cc == 0)
	507	goto out;
	508	if (inb(com+com_lsr) & LSR_TXRDY) {
	509	c = getc(&tp->t_outq);
	510	tp->t_state \|= TS_BUSY;
	511	outb(com+com_data, c);
54d5ccc6 WN	512	if (com_hasfifo & (1 << unit))
	513	for (c = 1; c < 16 && tp->t_outq.c_cc; ++c)
	514	outb(com+com_data, getc(&tp->t_outq));
3bf20cd8 WN	515	}
	516	out:
	517	splx(s);
	518	}
	519
	520	/*
	521	* Stop output on a line.
	522	*/
	523	/ARGSUSED/
	524	comstop(tp, flag)
	525	register struct tty *tp;
	526	{
	527	register int s;
	528
	529	s = spltty();
	530	if (tp->t_state & TS_BUSY) {
	531	if ((tp->t_state&TS_TTSTOP)==0)
	532	tp->t_state \|= TS_FLUSH;
	533	}
	534	splx(s);
	535	}
	536
	537	commctl(dev, bits, how)
	538	dev_t dev;
	539	int bits, how;
	540	{
	541	register com;
	542	register int unit;
	543	int s;
	544
	545	unit = UNIT(dev);
	546	com = com_addr[unit];
	547	s = spltty();
	548	switch (how) {
	549
	550	case DMSET:
	551	outb(com+com_mcr, bits \| MCR_IENABLE);
	552	break;
	553
	554	case DMBIS:
	555	outb(com+com_mcr, inb(com+com_mcr) \| bits \| MCR_IENABLE);
	556	break;
	557
	558	case DMBIC:
	559	outb(com+com_mcr, inb(com+com_mcr) & ~bits \| MCR_IENABLE);
	560	break;
	561
	562	case DMGET:
	563	bits = inb(com+com_msr);
	564	break;
	565	}
	566	(void) splx(s);
	567	return(bits);
	568	}
54d5ccc6 WN	569
	570	/*
	571	* Following are all routines needed for COM to act as console
	572	*/
	573	#include "i386/i386/cons.h"
	574
	575	comcnprobe(cp)
	576	struct consdev *cp;
	577	{
	578	int unit;
	579	extern int comopen();
	580
	581	/* locate the major number */
	582	for (commajor = 0; commajor < nchrdev; commajor++)
	583	if (cdevsw[commajor].d_open == comopen)
	584	break;
	585
	586	/* XXX: ick */
	587	unit = CONUNIT;
	588	com_addr[CONUNIT] = CONADDR;
	589
	590	/* make sure hardware exists? XXX */
	591
	592	/* initialize required fields */
	593	cp->cn_dev = makedev(commajor, unit);
	594	cp->cn_tp = &com_tty[unit];
	595	#ifdef COMCONSOLE
	596	cp->cn_pri = CN_REMOTE; /* Force a serial port console */
	597	#else
	598	cp->cn_pri = CN_NORMAL;
	599	#endif
	600	}
	601
	602	comcninit(cp)
	603	struct consdev *cp;
	604	{
	605	int unit = UNIT(cp->cn_dev);
	606
	607	cominit(unit, comdefaultrate);
	608	comconsole = unit;
	609	comconsinit = 1;
	610	}
	611
	612	cominit(unit, rate)
	613	int unit, rate;
	614	{
	615	register int com;
	616	int s;
	617	short stat;
	618
	619	#ifdef lint
	620	stat = unit; if (stat) return;
	621	#endif
	622	com = com_addr[unit];
	623	s = splhigh();
	624	outb(com+com_cfcr, CFCR_DLAB);
	625	rate = ttspeedtab(comdefaultrate, comspeedtab);
	626	outb(com+com_data, rate & 0xFF);
	627	outb(com+com_ier, rate >> 8);
	628	outb(com+com_cfcr, CFCR_8BITS);
	629	outb(com+com_ier, IER_ERXRDY \| IER_ETXRDY);
	630	outb(com+com_fifo, FIFO_ENABLE\|FIFO_RCV_RST\|FIFO_XMT_RST\|FIFO_TRIGGER_14);
	631	stat = inb(com+com_iir);
	632	splx(s);
633	}
634
635	comcngetc(dev)
636	{
637	register com = com_addr[UNIT(dev)];
638	short stat;
639	int c, s;
640
641	#ifdef lint
642	stat = dev; if (stat) return(0);
643	#endif
644	s = splhigh();
645	while (((stat = inb(com+com_lsr)) & LSR_RXRDY) == 0)
646	;
647	c = inb(com+com_data);
648	stat = inb(com+com_iir);
649	splx(s);
650	return(c);
651	}
652
653	/*
654	* Console kernel output character routine.
655	*/
656	comcnputc(dev, c)
657	dev_t dev;
658	register int c;
659	{
660	register com = com_addr[UNIT(dev)];
661	register int timo;
662	short stat;
663	int s = splhigh();
664
665	#ifdef lint
666	stat = dev; if (stat) return;
667	#endif
668	#ifdef KGDB
669	if (dev != kgdb_dev)
670	#endif
671	if (comconsinit == 0) {
672	(void) cominit(UNIT(dev), comdefaultrate);
673	comconsinit = 1;
674	}
675	/* wait for any pending transmission to finish */
676	timo = 50000;
677	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
678	;
679	outb(com+com_data, c);
680	/* wait for this transmission to complete */
681	timo = 1500000;
682	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
683	;
684	/* clear any interrupts generated by this transmission */
685	stat = inb(com+com_iir);
686	splx(s);
687	}
3bf20cd8	688	#endif