4.4BSD/usr/src/sys/i386/isa/com.c
/*-
* Copyright (c) 1991, 1993
* 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 8.1 (Berkeley) 6/11/93
*/
#include "com.h"
#if NCOM > 0
/*
* COM driver, based on HP dca driver
* uses National Semiconductor NS16450/NS16550AF UART
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.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 <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, inb (dev->id_iobase+com_cfcr) & ~0x80);
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