File: [cvs.NetBSD.org] / src / sys / dev / ic / com.c (download)
Revision 1.46, Sun Jan 29 02:58:20 1995 UTC (29 years, 2 months ago) by cgd
Branch: MAIN
Changes since 1.45: +2 -2
lines
use chip headers in /dev/ic
|
/* $NetBSD: com.c,v 1.46 1995/01/29 02:58:20 cgd Exp $ */
/*-
* Copyright (c) 1993, 1994 Charles Hannum.
* 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.
*
* @(#)com.c 7.5 (Berkeley) 5/16/91
*/
/*
* COM driver, based on HP dca driver
* uses National Semiconductor NS16450/NS16550AF UART
*/
#include "com.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/tty.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/types.h>
#include <sys/device.h>
#include <machine/cpu.h>
#include <machine/pio.h>
#include <i386/isa/isavar.h>
#include <i386/isa/comreg.h>
#include <dev/ic/ns16550.h>
struct com_softc {
struct device sc_dev;
struct intrhand sc_ih;
int sc_overflows;
int sc_iobase;
u_char sc_hwflags;
#define COM_HW_NOIEN 0x01
#define COM_HW_FIFO 0x02
#define COM_HW_CONSOLE 0x40
u_char sc_swflags;
#define COM_SW_SOFTCAR 0x01
#define COM_SW_CLOCAL 0x02
#define COM_SW_CRTSCTS 0x04
#define COM_SW_MDMBUF 0x08
u_char sc_msr, sc_mcr;
};
/* XXXX should be in com_softc, but not ready for that yet */
struct tty *com_tty[NCOM];
int comprobe __P((struct device *, void *, void *));
void comattach __P((struct device *, struct device *, void *));
int comopen __P((dev_t, int, int, struct proc *));
int comclose __P((dev_t, int, int, struct proc *));
void comdiag __P((void *));
int comintr __P((struct com_softc *));
int comparam __P((struct tty *, struct termios *));
void comstart __P((struct tty *));
struct cfdriver comcd = {
NULL, "com", comprobe, comattach, DV_TTY, sizeof(struct com_softc)
};
int comdefaultrate = TTYDEF_SPEED;
#ifdef COMCONSOLE
int comconsole = COMCONSOLE;
#else
int comconsole = -1;
#endif
int comconsinit;
int commajor;
#ifdef KGDB
#include <machine/remote-sl.h>
extern int kgdb_dev;
extern int kgdb_rate;
extern int kgdb_debug_init;
#endif
#define COMUNIT(x) (minor(x))
#define bis(c, b) do { const register int com_ad = (c); \
outb(com_ad, inb(com_ad) | (b)); } while(0)
#define bic(c, b) do { const register int com_ad = (c); \
outb(com_ad, inb(com_ad) & ~(b)); } while(0)
int
comspeed(speed)
long speed;
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
if (speed == 0)
return 0;
if (speed < 0)
return -1;
x = divrnd((COM_FREQ / 16), speed);
if (x <= 0)
return -1;
err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > COM_TOLERANCE)
return -1;
return x;
#undef divrnd(n, q)
}
int
comprobe1(iobase)
int iobase;
{
/* force access to id reg */
outb(iobase + com_cfcr, 0);
outb(iobase + com_iir, 0);
if (inb(iobase + com_iir) & 0x38)
return 0;
return 1;
}
int
comprobe(parent, match, aux)
struct device *parent;
void *match, *aux;
{
struct isa_attach_args *ia = aux;
int iobase = ia->ia_iobase;
if (!comprobe1(iobase))
return 0;
ia->ia_iosize = COM_NPORTS;
ia->ia_msize = 0;
return 1;
}
void
comattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct com_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
struct cfdata *cf = sc->sc_dev.dv_cfdata;
int iobase = ia->ia_iobase;
struct tty *tp;
sc->sc_iobase = iobase;
sc->sc_hwflags = cf->cf_flags & COM_HW_NOIEN;
sc->sc_swflags = 0;
if (sc->sc_dev.dv_unit == comconsole)
delay(1000);
/* look for a NS 16550AF UART with FIFOs */
outb(iobase + com_fifo,
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14);
delay(100);
if ((inb(iobase + com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK)
if ((inb(iobase + com_fifo) & FIFO_TRIGGER_14) == FIFO_TRIGGER_14) {
sc->sc_hwflags |= COM_HW_FIFO;
printf(": ns16550a, working fifo\n");
} else
printf(": ns82550 or ns16550, broken fifo\n");
else
printf(": ns82450 or ns16450, no fifo\n");
outb(iobase + com_fifo, 0);
/* disable interrupts */
outb(iobase + com_ier, 0);
outb(iobase + com_mcr, 0);
if (ia->ia_irq != IRQUNK) {
sc->sc_ih.ih_fun = comintr;
sc->sc_ih.ih_arg = sc;
sc->sc_ih.ih_level = IPL_TTY;
intr_establish(ia->ia_irq, IST_EDGE, &sc->sc_ih);
}
#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("%s: ", sc->sc_dev.dv_xname);
kgdb_connect(1);
} else
printf("%s: kgdb enabled\n",
sc->sc_dev.dv_xname);
}
}
#endif
if (sc->sc_dev.dv_unit == comconsole) {
/*
* Need to reset baud rate, etc. of next print so reset
* comconsinit. Also make sure console is always "hardwired".
*/
comconsinit = 0;
sc->sc_hwflags |= COM_HW_CONSOLE;
sc->sc_swflags |= COM_SW_SOFTCAR;
}
}
int
comopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
int unit = COMUNIT(dev);
struct com_softc *sc;
int iobase;
struct tty *tp;
int s;
int error = 0;
if (unit >= comcd.cd_ndevs)
return ENXIO;
sc = comcd.cd_devs[unit];
if (!sc)
return ENXIO;
s = spltty();
if (!com_tty[unit])
tp = com_tty[unit] = ttymalloc();
else
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);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_cflag = TTYDEF_CFLAG;
if (sc->sc_swflags & COM_SW_CLOCAL)
tp->t_cflag |= CLOCAL;
if (sc->sc_swflags & COM_SW_CRTSCTS)
tp->t_cflag |= CRTSCTS;
if (sc->sc_swflags & COM_SW_MDMBUF)
tp->t_cflag |= MDMBUF;
tp->t_lflag = TTYDEF_LFLAG;
tp->t_ispeed = tp->t_ospeed = comdefaultrate;
comparam(tp, &tp->t_termios);
ttsetwater(tp);
iobase = sc->sc_iobase;
/* Set the FIFO threshold based on the receive speed. */
if (sc->sc_hwflags & COM_HW_FIFO)
outb(iobase + com_fifo,
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST |
(tp->t_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
/* flush any pending I/O */
(void) inb(iobase + com_lsr);
(void) inb(iobase + com_data);
/* you turn me on, baby */
sc->sc_mcr = MCR_DTR | MCR_RTS;
if (!(sc->sc_hwflags & COM_HW_NOIEN))
sc->sc_mcr |= MCR_IENABLE;
outb(iobase + com_mcr, sc->sc_mcr);
outb(iobase + com_ier,
IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC);
sc->sc_msr = inb(iobase + com_msr);
if (sc->sc_swflags & COM_SW_SOFTCAR || sc->sc_msr & MSR_DCD ||
tp->t_cflag & MDMBUF)
tp->t_state |= TS_CARR_ON;
else
tp->t_state &= ~TS_CARR_ON;
} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) {
splx(s);
return EBUSY;
}
/* wait for carrier if necessary */
if ((flag & O_NONBLOCK) == 0)
while ((tp->t_cflag & CLOCAL) == 0 &&
(tp->t_state & TS_CARR_ON) == 0) {
tp->t_state |= TS_WOPEN;
error = ttysleep(tp, (caddr_t)&tp->t_rawq,
TTIPRI | PCATCH, ttopen, 0);
if (error) {
/* XXX should turn off chip if we're the
only waiter */
splx(s);
return error;
}
}
splx(s);
return (*linesw[tp->t_line].l_open)(dev, tp);
}
int
comclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
int unit = COMUNIT(dev);
struct com_softc *sc = comcd.cd_devs[unit];
int iobase = sc->sc_iobase;
struct tty *tp = com_tty[unit];
(*linesw[tp->t_line].l_close)(tp, flag);
#ifdef KGDB
/* do not disable interrupts if debugging */
if (kgdb_dev != makedev(commajor, unit))
#endif
{
bic(iobase + com_cfcr, CFCR_SBREAK);
outb(iobase + com_ier, 0);
if (tp->t_cflag & HUPCL &&
(sc->sc_swflags & COM_SW_SOFTCAR) == 0)
/* XXX perhaps only clear DTR */
outb(iobase + com_mcr, 0);
}
ttyclose(tp);
#ifdef notyet /* XXXX */
if (unit != comconsole) {
ttyfree(tp);
com_tty[unit] = (struct tty *)NULL;
}
#endif
return 0;
}
int
comread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
struct tty *tp = com_tty[COMUNIT(dev)];
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
int
comwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
struct tty *tp = com_tty[COMUNIT(dev)];
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
static u_char
tiocm_xxx2mcr(data)
int data;
{
u_char m = 0;
if (data & TIOCM_DTR)
m |= MCR_DTR;
if (data & TIOCM_RTS)
m |= MCR_RTS;
return m;
}
int
comioctl(dev, cmd, data, flag, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
int unit = COMUNIT(dev);
struct com_softc *sc = comcd.cd_devs[unit];
int iobase = sc->sc_iobase;
struct tty *tp = com_tty[unit];
int error;
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
if (error >= 0)
return error;
error = ttioctl(tp, cmd, data, flag, p);
if (error >= 0)
return error;
switch (cmd) {
case TIOCSBRK:
bis(iobase + com_cfcr, CFCR_SBREAK);
break;
case TIOCCBRK:
bic(iobase + com_cfcr, CFCR_SBREAK);
break;
case TIOCSDTR:
outb(iobase + com_mcr, sc->sc_mcr |= (MCR_DTR | MCR_RTS));
break;
case TIOCCDTR:
outb(iobase + com_mcr, sc->sc_mcr &= ~(MCR_DTR | MCR_RTS));
break;
case TIOCMSET:
sc->sc_mcr &= ~(MCR_DTR | MCR_RTS);
case TIOCMBIS:
outb(iobase + com_mcr,
sc->sc_mcr |= tiocm_xxx2mcr(*(int *)data));
break;
case TIOCMBIC:
outb(iobase + com_mcr,
sc->sc_mcr &= ~tiocm_xxx2mcr(*(int *)data));
break;
case TIOCMGET: {
u_char m;
int bits = 0;
m = sc->sc_mcr;
if (m & MCR_DTR)
bits |= TIOCM_DTR;
if (m & MCR_RTS)
bits |= TIOCM_RTS;
m = sc->sc_msr;
if (m & MSR_DCD)
bits |= TIOCM_CD;
if (m & MSR_CTS)
bits |= TIOCM_CTS;
if (m & MSR_DSR)
bits |= TIOCM_DSR;
if (m & (MSR_RI | MSR_TERI))
bits |= TIOCM_RI;
if (inb(iobase + com_ier))
bits |= TIOCM_LE;
*(int *)data = bits;
break;
}
case TIOCGFLAGS: {
int bits = 0;
if (sc->sc_swflags & COM_SW_SOFTCAR)
bits |= TIOCFLAG_SOFTCAR;
if (sc->sc_swflags & COM_SW_CLOCAL)
bits |= TIOCFLAG_CLOCAL;
if (sc->sc_swflags & COM_SW_CRTSCTS)
bits |= TIOCFLAG_CRTSCTS;
if (sc->sc_swflags & COM_SW_MDMBUF)
bits |= TIOCFLAG_MDMBUF;
*(int *)data = bits;
break;
}
case TIOCSFLAGS: {
int userbits, driverbits = 0;
error = suser(p->p_ucred, &p->p_acflag);
if (error != 0)
return(EPERM);
userbits = *(int *)data;
if ((userbits & TIOCFLAG_SOFTCAR) ||
(sc->sc_hwflags & COM_HW_CONSOLE))
driverbits |= COM_SW_SOFTCAR;
if (userbits & TIOCFLAG_CLOCAL)
driverbits |= COM_SW_CLOCAL;
if (userbits & TIOCFLAG_CRTSCTS)
driverbits |= COM_SW_CRTSCTS;
if (userbits & TIOCFLAG_MDMBUF)
driverbits |= COM_SW_MDMBUF;
sc->sc_swflags = driverbits;
break;
}
default:
return ENOTTY;
}
return 0;
}
int
comparam(tp, t)
struct tty *tp;
struct termios *t;
{
struct com_softc *sc = comcd.cd_devs[COMUNIT(tp->t_dev)];
int iobase = sc->sc_iobase;
int ospeed = comspeed(t->c_ospeed);
u_char cfcr;
int s;
/* check requested parameters */
if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
return EINVAL;
switch (t->c_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 (t->c_cflag & PARENB) {
cfcr |= CFCR_PENAB;
if ((t->c_cflag & PARODD) == 0)
cfcr |= CFCR_PEVEN;
}
if (t->c_cflag & CSTOPB)
cfcr |= CFCR_STOPB;
s = spltty();
if (ospeed == 0)
outb(iobase + com_mcr, sc->sc_mcr &= ~MCR_DTR);
/*
* Set the FIFO threshold based on the receive speed, if we are
* changing it.
*
* XXX
* It would be better if we waited for the FIFO to empty, so we don't
* lose any in-transit characters.
*/
if (tp->t_ispeed != t->c_ispeed) {
if (sc->sc_hwflags & COM_HW_FIFO)
outb(iobase + com_fifo,
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST |
(t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
}
outb(iobase + com_cfcr, cfcr | CFCR_DLAB);
outb(iobase + com_dlbl, ospeed);
outb(iobase + com_dlbh, ospeed>>8);
outb(iobase + com_cfcr, cfcr);
if (ospeed != 0)
outb(iobase + com_mcr, sc->sc_mcr |= MCR_DTR);
/* When not using CRTSCTS, RTS follows DTR. */
if ((t->c_cflag & CRTSCTS) == 0) {
if (sc->sc_mcr & MCR_DTR) {
if ((sc->sc_mcr & MCR_RTS) == 0)
outb(iobase + com_mcr, sc->sc_mcr |= MCR_RTS);
} else {
if (sc->sc_mcr & MCR_RTS)
outb(iobase + com_mcr, sc->sc_mcr &= ~MCR_RTS);
}
}
/*
* If CTS is off and CRTSCTS is changed, we must toggle TS_TTSTOP.
* XXX should be done at tty layer.
*/
if ((sc->sc_msr & MSR_CTS) == 0 &&
(tp->t_cflag & CRTSCTS) != (t->c_cflag & CRTSCTS)) {
if ((t->c_cflag & CRTSCTS) == 0) {
tp->t_state &= ~TS_TTSTOP;
(*linesw[tp->t_line].l_start)(tp);
} else
tp->t_state |= TS_TTSTOP;
}
/*
* If DCD is off and MDMBUF is changed, we must toggle TS_TTSTOP.
* XXX should be done at tty layer.
*/
if ((sc->sc_swflags & COM_SW_SOFTCAR) == 0 &&
(sc->sc_msr & MSR_DCD) == 0 &&
(tp->t_cflag & MDMBUF) != (t->c_cflag & MDMBUF)) {
if ((t->c_cflag & MDMBUF) == 0) {
tp->t_state &= ~TS_TTSTOP;
(*linesw[tp->t_line].l_start)(tp);
} else
tp->t_state |= TS_TTSTOP;
}
/* and copy to tty */
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = t->c_cflag;
splx(s);
return 0;
}
void
comstart(tp)
struct tty *tp;
{
struct com_softc *sc = comcd.cd_devs[COMUNIT(tp->t_dev)];
int iobase = sc->sc_iobase;
int s;
s = spltty();
if (tp->t_state & (TS_TTSTOP | TS_BUSY))
goto out;
#if 0 /* XXXX I think this is handled adequately by commint() and comparam(). */
if (tp->t_cflag & CRTSCTS && (sc->sc_mcr & MSR_CTS) == 0)
goto out;
#endif
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;
tp->t_state |= TS_BUSY;
if ((inb(iobase + com_lsr) & LSR_TXRDY) == 0)
goto out;
if (sc->sc_hwflags & COM_HW_FIFO) {
u_char buffer[16], *cp = buffer;
int n = q_to_b(&tp->t_outq, cp, sizeof buffer);
do {
outb(iobase + com_data, *cp++);
} while (--n);
} else
outb(iobase + com_data, getc(&tp->t_outq));
out:
splx(s);
}
/*
* Stop output on a line.
*/
void
comstop(tp, flag)
struct tty *tp;
{
int s;
s = spltty();
if (tp->t_state & TS_BUSY)
if ((tp->t_state & TS_TTSTOP) == 0)
tp->t_state |= TS_FLUSH;
splx(s);
}
static inline void
comeint(sc, stat)
struct com_softc *sc;
int stat;
{
int iobase = sc->sc_iobase;
int unit = sc->sc_dev.dv_unit;
struct tty *tp = com_tty[unit];
int c;
c = inb(iobase + 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;
if (stat & LSR_OE) {
if (sc->sc_overflows++ == 0)
timeout(comdiag, sc, 60 * hz);
}
/* XXXX put in FIFO and process later */
(*linesw[tp->t_line].l_rint)(c, tp);
}
static inline void
commint(sc)
struct com_softc *sc;
{
int iobase = sc->sc_iobase;
struct tty *tp = com_tty[sc->sc_dev.dv_unit];
u_char msr, delta;
msr = inb(iobase + com_msr);
delta = msr ^ sc->sc_msr;
sc->sc_msr = msr;
if (delta & MSR_DCD && (sc->sc_swflags & COM_SW_SOFTCAR) == 0) {
if (msr & MSR_DCD)
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0)
outb(iobase + com_mcr,
sc->sc_mcr &= ~(MCR_DTR | MCR_RTS));
}
if (delta & MSR_CTS && tp->t_cflag & CRTSCTS) {
/* the line is up and we want to do rts/cts flow control */
if (msr & MSR_CTS) {
tp->t_state &= ~TS_TTSTOP;
(*linesw[tp->t_line].l_start)(tp);
} else
tp->t_state |= TS_TTSTOP;
}
}
void
comdiag(arg)
void *arg;
{
struct com_softc *sc = arg;
int overflows;
int s;
s = spltty();
overflows = sc->sc_overflows;
sc->sc_overflows = 0;
splx(s);
if (overflows)
log(LOG_WARNING, "%s: %d silo overflow%s\n",
sc->sc_dev.dv_xname, overflows, overflows == 1 ? "" : "s");
}
int
comintr(sc)
struct com_softc *sc;
{
int iobase = sc->sc_iobase;
struct tty *tp;
u_char code;
code = inb(iobase + com_iir) & IIR_IMASK;
if (code & IIR_NOPEND)
return 0;
for (;;) {
if (code & IIR_RXRDY) {
tp = com_tty[sc->sc_dev.dv_unit];
/* XXXX put in FIFO and process later */
while (code = (inb(iobase + com_lsr) & LSR_RCV_MASK)) {
if (code == LSR_RXRDY) {
code = inb(iobase + com_data);
if (tp->t_state & TS_ISOPEN)
(*linesw[tp->t_line].l_rint)(code, tp);
#ifdef KGDB
else {
if (kgdb_dev == makedev(commajor, unit) &&
code == FRAME_END)
kgdb_connect(0);
}
#endif
} else if (code & LSR_RXRDY)
comeint(sc, code);
}
} else if (code == IIR_TXRDY) {
tp = com_tty[sc->sc_dev.dv_unit];
tp->t_state &= ~TS_BUSY;
if (tp->t_state & TS_FLUSH)
tp->t_state &= ~TS_FLUSH;
else
if (tp->t_line)
(*linesw[tp->t_line].l_start)(tp);
else
comstart(tp);
} else if (code == IIR_MLSC) {
commint(sc);
} else {
log(LOG_WARNING, "%s: weird interrupt: iir=0x%02x\n",
sc->sc_dev.dv_xname, code);
}
code = inb(iobase + com_iir) & IIR_IMASK;
if (code & IIR_NOPEND)
return 1;
}
}
/*
* Following are all routines needed for COM to act as console
*/
#include <dev/cons.h>
comcnprobe(cp)
struct consdev *cp;
{
if (!comprobe1(CONADDR)) {
cp->cn_pri = CN_DEAD;
return;
}
/* locate the major number */
for (commajor = 0; commajor < nchrdev; commajor++)
if (cdevsw[commajor].d_open == comopen)
break;
/* initialize required fields */
cp->cn_dev = makedev(commajor, CONUNIT);
#ifdef COMCONSOLE
cp->cn_pri = CN_REMOTE; /* Force a serial port console */
#else
cp->cn_pri = CN_NORMAL;
#endif
}
comcninit(cp)
struct consdev *cp;
{
cominit(CONUNIT, comdefaultrate);
comconsole = CONUNIT;
comconsinit = 0;
}
cominit(unit, rate)
int unit, rate;
{
int s = splhigh();
int iobase = CONADDR;
u_char stat;
outb(iobase + com_cfcr, CFCR_DLAB);
rate = comspeed(comdefaultrate);
outb(iobase + com_dlbl, rate);
outb(iobase + com_dlbh, rate >> 8);
outb(iobase + com_cfcr, CFCR_8BITS);
outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY);
outb(iobase + com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_4);
stat = inb(iobase + com_iir);
splx(s);
}
comcngetc(dev)
dev_t dev;
{
int s = splhigh();
int iobase = CONADDR;
u_char stat, c;
while (((stat = inb(iobase + com_lsr)) & LSR_RXRDY) == 0)
;
c = inb(iobase + com_data);
stat = inb(iobase + com_iir);
splx(s);
return c;
}
/*
* Console kernel output character routine.
*/
comcnputc(dev, c)
dev_t dev;
int c;
{
int s = splhigh();
int iobase = CONADDR;
u_char stat;
register int timo;
#ifdef KGDB
if (dev != kgdb_dev)
#endif
if (comconsinit == 0) {
(void) cominit(COMUNIT(dev), comdefaultrate);
comconsinit = 1;
}
/* wait for any pending transmission to finish */
timo = 50000;
while (((stat = inb(iobase + com_lsr)) & LSR_TXRDY) == 0 && --timo)
;
outb(iobase + com_data, c);
/* wait for this transmission to complete */
timo = 1500000;
while (((stat = inb(iobase + com_lsr)) & LSR_TXRDY) == 0 && --timo)
;
/* clear any interrupts generated by this transmission */
stat = inb(iobase + com_iir);
splx(s);
}
void
comcnpollc(dev, on)
dev_t dev;
int on;
{
}
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