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NetBSD/sys/arch/mac68k/dev/ser.c
briggs e99f003a7d Update to current work in progress. This includes an update to 
use config.new.
Numerous updates to console so it works better on the SE/30 screen.
Some nice changes from Brad Parker for handling NuBUS and an ethernet
driver that I haven't worked on, yet.
1993-11-29 00:32:22 +00:00

882 lines
21 KiB
C
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/*
* Copyright (c) 1982, 1986, 1990 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.
*
*/
/*
* Copyright (C) 1993 Allen K. Briggs, Chris P. Caputo,
* Michael L. Finch, Bradley A. Grantham, and
* Lawrence A. Kesteloot
* 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 Alice Group.
* 4. The names of the Alice Group or any of its members may not be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE ALICE GROUP ``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 ALICE GROUP 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.
*
* Hacked by Brad Parker, <brad@fcr.com>
* added CTS input flow control
* added DCD event detection
* added software fifo's
*
* $Id: ser.c,v 1.2 1993/11/29 00:32:58 briggs Exp $
*
* Mac II serial device interface
*
* Information used in this source was gleaned from low-memory
* global variables in MacOS and the Advanced Micro Devices
* 1992 Data Book/Handbook.
*/
#define NSER 2 /* Could be more later with proprietary serial iface? */
#include "sys/param.h"
#include "sys/systm.h"
#include "sys/ioctl.h"
#include "sys/tty.h"
#include "sys/proc.h"
#include "sys/conf.h"
#include "sys/file.h"
#include "sys/uio.h"
#include "sys/kernel.h"
#include "sys/syslog.h"
#include "sys/device.h"
#include "serreg.h"
#include "machine/cpu.h"
/*#define DEBUG*/
#undef DEBUG
volatile unsigned char *sccA = (unsigned char *) 0x50004000;
int serstart(), serparam(), serintr();
int ser_active = 0;
int nser = NSER;
int serdefaultrate = TTYDEF_SPEED;
int sermajor;
struct tty *ser_tty[NSER];
extern struct tty *constty;
#define UNIT(x) minor(x)
struct ser_status {
unsigned char ddcd, dcts; /* delta (change) flags */
unsigned char dcd, cts; /* last state of signal */
unsigned char dtr, rts; /* current state of signal */
int oflo; /* s/w fifo over flow */
int over; /* h/w fifo over flow */
int flags;
#define SER_BUSY 0x01
} ser_status[NSER];
#define SCC_INT 10
#define SCC_SPEED 11
char serial_id_string[] = "Two MacII serial devices built in.";
char serial_debug_id_string[] = "Two MacII serial devices--one in use for debugging.";
char serial_0_string[] = "MacBSD Serial Driver, Port 0\n\r";
char serial_1_string[] = "MacBSD Serial Driver, Port 1\n\r";
unsigned char ser_0_init_bytes[]={
#if 0 /* BG -- I made this table from scratch according to the docs. */
9, SER_W9_NV | SER_W9_DLC, /* No interrupt vector */
/* Disable lower chain */
4, SER_W4_1SBIT, /* One stop bit, clock times 1 */
10, SER_W10_NRZ, /* NRZ mode encoding */
11, SER_W11_TXBR | SER_W11_RXBR,/* Receive and Transmit using BR clock */
12, 102,
13, 0, /* Time code for 19200 baud */
14, SER_W14_ENBBR, /* Enable BR clock */
15, SER_W15_ABRTINT, /* Abort pending interrupts */
3, SER_W3_RX8DBITS | SER_W3_ENBRX,
/* Receive 8 bit data, rx int ready */
5, SER_W5_TX8DBITS | SER_W5_ENBTX,
/* Receive 8 bit data, rx int ready */
0, SER_W0_ENBRXRDY, /* Enable rx int on next char */
1, SER_W1_ENBRXRDY | SER_W1_ENBTXRDY,
/* Enable receive and transmit ints */
9, SER_W9_MIE /* Enable Master Interrupt */
#else /* but it doesn't work as well as this hacked job does: */
2, 0,
10, 0,
11, 0x50,
4, 0x44,
3, 0xc1,
5, 0x68,
14, 0x01,
15, 0x80,
12, 4,
13, 0,
1, 0x13,
0, 0x10,
0, 0x20,
9, 0x08
#endif
};
unsigned char ser_1_init_bytes[]={
2, 0,
10, 0,
11, 0x50,
4, 0x44,
3, 0xc1,
5, 0x68,
14, 0x01,
15, 0x80,
12, 4,
13, 0,
1, 0x13,
0, 0x10,
0, 0x20,
9, 0x08
};
#if 0
int
serinit(register struct macdriver *md)
{
extern int serial_boot_echo;
int bcount;
int i, s;
md->hwfound = 1;
md->name = serial_id_string;
if (serial_boot_echo) {
md->name = serial_debug_id_string;
}
SER_DOCNTL(0, 9, 0xc0); /* force hardware reset */
s = splhigh();
/* initialize port 0 */
bcount = sizeof(ser_0_init_bytes);
for(i = 0; i < bcount; i += 2){
SER_DOCNTL(0, ser_0_init_bytes[i], ser_0_init_bytes[i + 1]);
}
/* initialize port 1 */
bcount = sizeof(ser_1_init_bytes);
for(i = 0; i < bcount; i += 2){
SER_DOCNTL(1, ser_1_init_bytes[i], ser_1_init_bytes[i + 1]);
}
splx(s);
return(1);
}
#endif
extern int matchbyname();
static void
serattach(parent, dev, aux)
struct device *parent, *dev;
void *aux;
{
extern int serial_boot_echo;
int bcount;
int i, s;
printf("\n");
if (serial_boot_echo) {
printf("(serial boot echo is on)\n");
}
SER_DOCNTL(0, 9, 0xc0); /* force hardware reset */
s = splhigh();
/* initialize port 0 */
bcount = sizeof(ser_0_init_bytes);
for(i = 0; i < bcount; i += 2){
SER_DOCNTL(0, ser_0_init_bytes[i], ser_0_init_bytes[i + 1]);
}
/* initialize port 1 */
bcount = sizeof(ser_1_init_bytes);
for(i = 0; i < bcount; i += 2){
SER_DOCNTL(1, ser_1_init_bytes[i], ser_1_init_bytes[i + 1]);
}
splx(s);
}
struct cfdriver sercd =
{ NULL, "ser", matchbyname, serattach,
DV_TTY, sizeof(struct device), NULL, 0 };
/* ARGSUSED */
seropen(dev_t dev, int flag, int mode, struct proc *p)
{
register struct tty *tp;
register int unit;
int error = 0;
#if defined(DEBUG)
printf("ser: entered seropen(%d, %d, %d, xx)\n", dev, flag, mode);
#endif
unit = UNIT(dev);
if (unit >= NSER ){
return (ENXIO);
}
ser_active |= 1 << unit;
if (ser_tty[unit]) {
tp = ser_tty[unit];
} else {
tp = ser_tty[unit] = ttymalloc();
}
tp->t_oproc = serstart;
tp->t_param = serparam;
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 = serdefaultrate;
}
serparam(tp, &tp->t_termios);
ttsetwater(tp);
} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0){
printf("ser%d: device is busy.\n", unit);
return (EBUSY);
}
/* serial device open code */
bzero((char *)&ser_status[unit], sizeof(struct ser_status));
/* turn on RTS & DTR */
serctl(unit, SER_W5_RTS | SER_W5_DTR, DMSET);
if(serctl(unit, 0, DMGET) & SER_R0_DCD)
tp->t_state |= TS_CARR_ON;
/* enable interrupts */
serctl(unit, 1, SCC_INT);
/* end serial device open code */
(void) spltty();
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);
#if defined(DEBUG)
printf("ser: exiting seropen()\n");
#endif
return (error);
}
/*ARGSUSED*/
serclose(dev_t dev, int flag, int mode, struct proc *p)
{
register struct tty *tp;
register int unit;
int s;
#if defined(DEBUG)
printf("ser: entered serclose()\n");
#endif
unit = UNIT(dev);
tp = ser_tty[unit];
(*linesw[tp->t_line].l_close)(tp, flag);
/* serial device close code */
/* disable interrupts */
serctl(unit, 0, SCC_INT);
if (tp->t_cflag&HUPCL || tp->t_state&TS_WOPEN ||
(tp->t_state&TS_ISOPEN) == 0)
serctl(unit, 0, DMSET); /* turn RTS and DTR off */
ser_active &= ~(1 << unit);
/* end of serial device close code */
ttyclose(tp);
#ifdef broken
ttyfree(tp);
ser_tty[unit] = NULL;
#endif
#if defined(DEBUG)
printf("ser: exiting serclose()\n");
#endif
return (0);
}
serread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
register struct tty *tp = ser_tty[UNIT(dev)];
#if defined(DEBUG)
printf("ser: called serread()\n");
#endif
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
serwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int unit = UNIT(dev);
register struct tty *tp = ser_tty[unit];
#if defined(DEBUG)
printf("ser: called serwrite()\n");
#endif
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
/* private buffers used by driver at splscc() */
#define INBUFLEN 128
#define OUTBUFLEN 512
static unsigned char ser_inbuf[NSER][INBUFLEN];
static volatile unsigned char ser_inlen[NSER] = {0,0};
static unsigned char ser_intail[NSER] = {0,0};
static unsigned char ser_outbuf[NSER][OUTBUFLEN];
static volatile unsigned int ser_outlen[NSER] = {0,0};
static volatile unsigned int ser_outtail[NSER] = {0,0};
/* NOTE: This function is called by locore.s on a level 4 interrupt.
since "splscc()" is level 4, and this is currently higher than
anything except splhigh(), you can't call anything from this
routine or you'll break the syncronization. basically we just
do i/o from our local buffers and signal the upper layer with
a software interrupt.
*/
int
serintr()
{
/* serial interrupt code */
unsigned char reg0, reg1, ch, ch1, c, bits;
int s;
register int unit;
/* read status to reset SCC state machine */
reg0 = SCCCNTL(0);
/* reset port B vector to see who interrupted us */
bits = SER_STATUS(1, 2) & 0x0e;
if (bits < 8)
unit = 1;
else
unit = 0;
reg0 = SER_STATUS(unit, 0);
switch ((bits & 7) >> 1) {
case 0: /* tranmitter buffer empty */
if (ser_outlen[unit] > 0)
{
c = ser_outbuf[unit][ser_outtail[unit]];
ser_outtail[unit] = (ser_outtail[unit] + 1) % OUTBUFLEN;
SCCRDWR(unit) = c;
ser_outlen[unit]--;
} else {
SER_DOCNTL(unit, 0, SER_W0_RSTTXPND);
ser_status[unit].flags &= ~SER_BUSY;
setsoftserial();
}
SER_DOCNTL(unit, 0, SER_W0_RSTIUS);
break;
case 1: /* ext/status change */
if ((reg0 & SER_R0_DCD) && ser_status[unit].dcd == 0)
ser_status[unit].ddcd = 1;
else
if (!(reg0 & SER_R0_DCD) && ser_status[unit].dcd != 0)
ser_status[unit].ddcd = 1;
ser_status[unit].dcd = reg0 & SER_R0_DCD;
if ((reg0 & SER_R0_CTS) && ser_status[unit].cts == 0)
ser_status[unit].dcts = 1;
else
if (!(reg0 & SER_R0_CTS) && ser_status[unit].cts != 0)
ser_status[unit].dcts = 1;
ser_status[unit].cts = reg0 & SER_R0_CTS;
if (reg0 & SER_R0_TXUNDERRUN)
SER_DOCNTL(unit, 0, SER_W0_RSTTXUNDERRUN);
SER_DOCNTL(unit, 0, SER_W0_RSTESINTS);
SER_DOCNTL(unit, 0, SER_W0_RSTIUS);
break;
case 2: /* recv char available */
ch = SCCRDWR(unit);
c = 1;
if (SER_STATUS(unit, 0) & SER_R0_RXREADY) {
ch1 = SCCRDWR(unit);
c = 2;
}
if (ser_inlen[unit] < INBUFLEN)
ser_inbuf[unit][(ser_intail[unit] + (ser_inlen[unit]++)) % INBUFLEN] = ch;
else ser_status[unit].oflo++;
if (c > 1) {
if (ser_inlen[unit] < INBUFLEN)
ser_inbuf[unit][(ser_intail[unit] + (ser_inlen[unit]++)) % INBUFLEN] = ch1;
else ser_status[unit].oflo++;
}
setsoftserial();
SER_DOCNTL(unit, 0, SER_W0_RSTIUS);
break;
case 3: /* spec recv condition */
reg1 = SER_STATUS(unit, 1);
SCCRDWR(unit); /* flush fifo */
if (reg1 & SER_R1_RXOVERRUN)
ser_status[unit].over++;
SER_DOCNTL(unit, 0, SER_W0_RSTERR);
SER_DOCNTL(unit, 0, SER_W0_RSTIUS);
break;
}
return(1);
/* end of serial interrupt code */
}
/* serial software interrupt. do all the things we could
not do at splscc();
*/
void
sersir()
{
int unit, s, c;
register struct tty *tp;
for (unit = 0; unit < 2; unit++) {
if ((tp = ser_tty[unit]) == 0)
continue;
/* check for overflows */
if (ser_status[unit].oflo || ser_status[unit].over) {
s = splhigh();
ser_status[unit].oflo = 0;
ser_status[unit].over = 0;
splx(s);
if (tp->t_state & TS_ISOPEN)
(*linesw[tp->t_line].l_rint)('#', tp);
}
/* check for change in DCD */
if (ser_status[unit].ddcd) {
s = splhigh();
ser_status[unit].ddcd = 0;
splx(s);
if (0) {
if (ser_status[unit].dcd)
tp->t_state |= TS_CARR_ON;
else
tp->t_state &= ~TS_CARR_ON;
(*linesw[tp->t_line].l_modem)(tp,
ser_status[unit].dcd ? 1 : 0);
}
}
/* check for change in CTS */
if (ser_status[unit].dcts) {
s = splhigh();
ser_status[unit].dcts = 0;
splx(s);
if ((tp->t_state & TS_ISOPEN) &&
(tp->t_flags & CRTSCTS)) {
tp->t_state &= ~TS_TTSTOP;
serstart(tp);
} else
tp->t_state |= TS_TTSTOP;
}
/* drain input fifo */
while (ser_inlen[unit] > 0) {
if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= TTYHOG) {
setsoftserial();
break;
}
s = splhigh();
c = ser_inbuf[unit][ser_intail[unit]];
ser_intail[unit] = (ser_intail[unit] + 1) % INBUFLEN;
ser_inlen[unit]--;
splx(s);
if (tp->t_state & TS_ISOPEN)
(*linesw[tp->t_line].l_rint)(c, tp);
}
/* fill output fifo */
if (ser_outlen[unit] == 0) {
if (tp->t_line)
(*linesw[tp->t_line].l_start)(tp);
else
serstart(tp);
}
}
}
int
serioctl(dev, cmd, data, flag)
dev_t dev;
int cmd;
caddr_t data;
int flag;
{
register struct tty *tp;
register int unit = UNIT(dev);
register int error;
#if defined(DEBUG)
printf("ser: entering ioctl()\n");
#endif
tp = ser_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);
switch (cmd) {
#if 0
case TIOCSBRK: /* turn break on */
dca->dca_cfcr |= CFCR_SBREAK;
break;
case TIOCCBRK: /* turn break off */
dca->dca_cfcr &= ~CFCR_SBREAK;
break;
#endif
case TIOCSDTR: /* set DTR */
(void) serctl(dev, SER_W5_DTR | SER_W5_RTS, DMBIS);
break;
case TIOCCDTR: /* clear DTR */
(void) serctl(dev, SER_W5_DTR | SER_W5_RTS, DMBIC);
break;
case TIOCMSET: /* set modem control bits */
(void) serctl(dev, *(int *)data, DMSET);
break;
case TIOCMBIS: /* OR bits on */
(void) serctl(dev, *(int *)data, DMBIS);
break;
case TIOCMBIC: /* AND bits off */
(void) serctl(dev, *(int *)data, DMBIC);
break;
case TIOCMGET: /* get modem bits */
*(int *)data = serctl(dev, 0, DMGET);
break;
default:
printf("ser%d: ioctl(,%d,,)\n", UNIT(dev), cmd);
return (ENOTTY);
}
#if defined(DEBUG)
printf("ser: exiting ioctl()\n");
#endif
return (0);
}
int
serparam(tp, t)
register struct tty *tp;
register struct termios *t;
{
register int cflag = t->c_cflag;
unsigned char reg3, reg4, reg5;
int unit = UNIT(tp->t_dev);
int ospeed = t->c_ospeed;
int s;
#if defined(DEBUG)
printf("ser: entering serparam()\n");
#endif
/* check requested parameters */
if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed)){
printf("ser: serparam() returning EINVAL\n");
return (EINVAL);
}
/* and copy to tty */
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = cflag;
printf("ospeed %d\n", ospeed);
/* Start of serial specific param code */
if(ospeed == 0) {
serctl(unit, 0, DMSET); /* hang up line */
return(0);
}
serctl(unit, ospeed, SCC_SPEED);
/*
ser_calc_regs(unit, cflag, &reg3, &reg4, &reg5);
s = splhigh();
SER_DOCNTL(unit, 3, reg3);
SER_DOCNTL(unit, 4, reg4);
SER_DOCNTL(unit, 5, reg5);
splx(s);
*/
serctl(unit, 1, SCC_INT);
serctl(unit, SER_W5_DTR | SER_W5_RTS, DMSET);
/* End of serial specific param code */
#if defined(DEBUG)
printf("ser: exiting serparam()\n");
#endif
return (0);
}
ser_calc_regs(unit, cflag, preg3, preg4, preg5)
int unit;
unsigned char *preg3, *preg4, *preg5;
{
unsigned char r3, r4, r5;
r3 = SER_W3_ENBRX;
r5 = SER_W5_ENBTX;
if (ser_status[unit].dtr)
r5 |= SER_W5_DTR;
if (ser_status[unit].rts)
r5 |= SER_W5_RTS;
switch (cflag&CSIZE) {
case CS5:
r3 |= SER_W3_RX5DBITS;
r5 |= SER_W5_TX5DBITS;
break;
case CS6:
r3 |= SER_W3_RX6DBITS;
r5 |= SER_W5_TX6DBITS;
break;
case CS7:
r3 |= SER_W3_RX7DBITS;
r5 |= SER_W5_TX7DBITS;
break;
case CS8:
r3 |= SER_W3_RX8DBITS;
r5 |= SER_W5_TX8DBITS;
break;
}
r4 = 0;
if(cflag & PARENB)
r4 |= (cflag & PARODD) ? SER_W4_PARODD : SER_W4_PAREVEN;
if(cflag & CSTOPB)
r4 |= SER_W4_2SBIT;
else
r4 |= SER_W4_1SBIT;
*preg3 = r3;
*preg4 = r4;
*preg5 = r5;
}
int
serstart(tp)
register struct tty *tp;
{
int s, s1;
int i, space, unit, c, need_start;
unit = UNIT(tp->t_dev);
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 || (tp->t_state & TS_BUSY) ||
(ser_status[unit].flags & SER_BUSY))
goto out;
tp->t_state |= TS_BUSY;
if(ser_outlen[unit] == 0){
c = (char)getc(&tp->t_outq);
need_start = 1;
} else
need_start = 0;
/* put characters into a buffer that serintr() will empty */
/* out on transmit-ready interrupts. */
/* get free space in s/w fifo - this will only get better */
s1 = splhigh();
space = OUTBUFLEN - ser_outlen[unit];
splx(s1);
while(tp->t_outq.c_cc && space > 0) {
/* note that getc goes spltty() */
c = getc(&tp->t_outq);
/* protect s/w fifo at splhigh() */
s1 = splhigh();
ser_outbuf[unit][(ser_outtail[unit] + (ser_outlen[unit]++))
% OUTBUFLEN] = (char)c;
splx(s1);
space--;
}
tp->t_state &= ~TS_BUSY;
if (need_start) {
s1 = splhigh();
ser_status[unit].flags |= SER_BUSY;
SCCRDWR(unit) = c; /* to start chain */
splx(s1);
}
out:
splx(s);
}
/*
* Stop output on a line.
*/
/*ARGSUSED*/
serstop(tp, flag)
register struct tty *tp;
int flag;
{
register int s;
#if defined(DEBUG)
printf("ser: entering serstop()\n");
#endif
s = spltty();
if (tp->t_state & TS_BUSY) {
if ((tp->t_state&TS_TTSTOP)==0)
tp->t_state |= TS_FLUSH;
}
#if defined(DEBUG)
printf("ser: exiting serstop()\n");
#endif
splx(s);
}
serctl(dev, bits, how)
dev_t dev;
int bits, how;
{
int unit, s;
unit = UNIT(dev);
/* run at splhigh so we don't get interrupted by i/o */
s = splhigh();
switch (how) {
case DMSET:
ser_status[unit].dtr = bits & SER_W5_DTR;
ser_status[unit].rts = bits & SER_W5_RTS;
SER_DOCNTL(unit, 5, bits | 0x68);
break;
case DMBIS:
break;
case DMBIC:
break;
case DMGET:
bits = SER_STATUS(unit, 0);
break;
/* */
case SCC_INT:
if (bits) {
SER_DOCNTL(unit, 0, SER_W0_RSTERR);
SER_DOCNTL(unit, 0, SER_W0_RSTIUS);
SER_DOCNTL(unit, 1,
SER_W1_ENBEXTINT |
SER_W1_ENBRXINT |
SER_W1_ENBTXINT);
} else
SER_DOCNTL(unit, 1, 0);
break;
case SCC_SPEED:
SER_DOCNTL(unit, 12, SERBRD(bits) & 0xff);
SER_DOCNTL(unit, 13, (SERBRD(bits) >> 8) & 0xff);
break;
}
(void) splx(s);
return(bits);
}
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