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NetBSD/sys/arch/pmax/dev/dc.c

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/*-
* Copyright (c) 1992 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell and Rick Macklem.
*
* 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.
*
* @(#)dc.c 7.12 (Berkeley) 12/20/92
*/
/*
* devDC7085.c --
*
* This file contains machine-dependent routines that handle the
* output queue for the serial lines.
*
* Copyright (C) 1989 Digital Equipment Corporation.
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies.
* Digital Equipment Corporation makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* from: $Header: /sprite/src/kernel/dev/ds3100.md/RCS/devDC7085.c,
* v 1.4 89/08/29 11:55:30 nelson Exp $ SPRITE (DECWRL)";
*/
#include <dc.h>
#if NDC > 0
/*
* DC7085 (DZ-11 look alike) Driver
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/proc.h>
#include <sys/map.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <machine/dc7085cons.h>
#include <machine/pmioctl.h>
#include <pmax/pmax/pmaxtype.h>
#include <pmax/pmax/cons.h>
#include <pmax/dev/device.h>
#include <pmax/dev/pdma.h>
#include <pmax/dev/fbreg.h>
extern int pmax_boardtype;
extern struct consdev cn_tab;
/*
* Driver information for auto-configuration stuff.
*/
int dcprobe();
void dcintr();
struct driver dcdriver = {
"dc", dcprobe, 0, 0, dcintr,
};
#define NDCLINE (NDC*4)
void dcstart __P((struct tty *));
void dcxint __P((struct tty *));
void dcPutc __P((dev_t, int));
void dcscan __P((void *));
int dcGetc __P((dev_t));
int dcparam __P((struct tty *, struct termios *));
extern void KBDReset __P((dev_t, void (*)()));
extern void MouseInit __P((dev_t, void (*)(), int (*)()));
struct tty dc_tty[NDCLINE];
int dc_cnt = NDCLINE;
void (*dcDivertXInput)(); /* X windows keyboard input routine */
void (*dcMouseEvent)(); /* X windows mouse motion event routine */
void (*dcMouseButtons)(); /* X windows mouse buttons event routine */
#ifdef DEBUG
int debugChar;
#endif
/*
* Software copy of brk register since it isn't readable
*/
int dc_brk[NDC];
char dcsoftCAR[NDC]; /* mask of dc's with carrier on (DSR) */
/*
* The DC7085 doesn't interrupt on carrier transitions, so
* we have to use a timer to watch it.
*/
int dc_timer; /* true if timer started */
/*
* Pdma structures for fast output code
*/
struct pdma dcpdma[NDCLINE];
struct speedtab dcspeedtab[] = {
0, 0,
50, LPR_B50,
75, LPR_B75,
110, LPR_B110,
134, LPR_B134,
150, LPR_B150,
300, LPR_B300,
600, LPR_B600,
1200, LPR_B1200,
1800, LPR_B1800,
2400, LPR_B2400,
4800, LPR_B4800,
9600, LPR_B9600,
19200, LPR_B19200,
-1, -1
};
#ifndef PORTSELECTOR
#define ISPEED TTYDEF_SPEED
#define LFLAG TTYDEF_LFLAG
#else
#define ISPEED B4800
#define LFLAG (TTYDEF_LFLAG & ~ECHO)
#endif
/*
* Test to see if device is present.
* Return true if found and initialized ok.
*/
dcprobe(cp)
register struct pmax_ctlr *cp;
{
register dcregs *dcaddr;
register struct pdma *pdp;
register struct tty *tp;
register int cntr;
int s;
if (cp->pmax_unit >= NDC)
return (0);
if (badaddr(cp->pmax_addr, 2))
return (0);
/*
* For a remote console, wait a while for previous output to
* complete.
*/
if (major(cn_tab.cn_dev) == DCDEV && cp->pmax_unit == 0 &&
cn_tab.cn_screen == 0)
DELAY(10000);
/* reset chip */
dcaddr = (dcregs *)cp->pmax_addr;
dcaddr->dc_csr = CSR_CLR;
MachEmptyWriteBuffer();
while (dcaddr->dc_csr & CSR_CLR)
;
dcaddr->dc_csr = CSR_MSE | CSR_TIE | CSR_RIE;
/* init pseudo DMA structures */
pdp = &dcpdma[cp->pmax_unit * 4];
tp = &dc_tty[cp->pmax_unit * 4];
for (cntr = 0; cntr < 4; cntr++) {
pdp->p_addr = (void *)dcaddr;
pdp->p_arg = (int)tp;
pdp->p_fcn = dcxint;
tp->t_addr = (caddr_t)pdp;
pdp++, tp++;
}
dcsoftCAR[cp->pmax_unit] = cp->pmax_flags | 0xB;
if (dc_timer == 0) {
dc_timer = 1;
timeout(dcscan, (void *)0, hz);
}
/*
* Special handling for consoles.
*/
if (cp->pmax_unit == 0) {
if (cn_tab.cn_screen) {
s = spltty();
dcaddr->dc_lpr = LPR_RXENAB | LPR_8_BIT_CHAR |
LPR_B4800 | DCKBD_PORT;
dcaddr->dc_lpr = LPR_RXENAB | LPR_B4800 | LPR_OPAR |
LPR_PARENB | LPR_8_BIT_CHAR | DCMOUSE_PORT;
MachEmptyWriteBuffer();
DELAY(1000);
KBDReset(makedev(DCDEV, DCKBD_PORT), dcPutc);
MouseInit(makedev(DCDEV, DCMOUSE_PORT), dcPutc, dcGetc);
splx(s);
} else if (major(cn_tab.cn_dev) == DCDEV) {
s = spltty();
dcaddr->dc_lpr = LPR_RXENAB | LPR_8_BIT_CHAR |
LPR_B9600 | minor(cn_tab.cn_dev);
MachEmptyWriteBuffer();
DELAY(1000);
cn_tab.cn_disabled = 0;
splx(s);
}
}
printf("dc%d at nexus0 csr 0x%x priority %d\n",
cp->pmax_unit, cp->pmax_addr, cp->pmax_pri);
return (1);
}
dcopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
register struct tty *tp;
register int unit;
int s, error = 0;
unit = minor(dev);
if (unit >= dc_cnt || dcpdma[unit].p_addr == (void *)0)
return (ENXIO);
tp = &dc_tty[unit];
tp->t_addr = (caddr_t)&dcpdma[unit];
tp->t_oproc = dcstart;
tp->t_param = dcparam;
tp->t_dev = dev;
if ((tp->t_state & TS_ISOPEN) == 0) {
tp->t_state |= TS_WOPEN;
ttychars(tp);
#ifndef PORTSELECTOR
if (tp->t_ispeed == 0) {
#endif
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_cflag = TTYDEF_CFLAG;
tp->t_lflag = LFLAG;
tp->t_ispeed = tp->t_ospeed = ISPEED;
#ifdef PORTSELECTOR
tp->t_cflag |= HUPCL;
#else
}
#endif
(void) dcparam(tp, &tp->t_termios);
ttsetwater(tp);
} else if ((tp->t_state & TS_XCLUDE) && curproc->p_ucred->cr_uid != 0)
return (EBUSY);
(void) dcmctl(dev, DML_DTR, DMSET);
s = spltty();
while (!(flag & O_NONBLOCK) && !(tp->t_cflag & CLOCAL) &&
!(tp->t_state & TS_CARR_ON)) {
tp->t_state |= TS_WOPEN;
if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
ttopen, 0))
break;
}
splx(s);
if (error)
return (error);
return ((*linesw[tp->t_line].l_open)(dev, tp));
}
/*ARGSUSED*/
dcclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
register struct tty *tp;
register int unit, bit;
unit = minor(dev);
tp = &dc_tty[unit];
bit = 1 << ((unit & 03) + 8);
if (dc_brk[unit >> 2] & bit) {
dc_brk[unit >> 2] &= ~bit;
ttyoutput(0, tp);
}
(*linesw[tp->t_line].l_close)(tp, flag);
if ((tp->t_cflag & HUPCL) || (tp->t_state & TS_WOPEN) ||
!(tp->t_state & TS_ISOPEN))
(void) dcmctl(dev, 0, DMSET);
return (ttyclose(tp));
}
dcread(dev, uio, flag)
dev_t dev;
struct uio *uio;
{
register struct tty *tp;
tp = &dc_tty[minor(dev)];
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
dcwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
{
register struct tty *tp;
tp = &dc_tty[minor(dev)];
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
/*ARGSUSED*/
dcioctl(dev, cmd, data, flag)
dev_t dev;
int cmd;
caddr_t data;
int flag;
{
register struct tty *tp;
register int unit = minor(dev);
register int dc = unit >> 2;
int error;
tp = &dc_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) {
case TIOCSBRK:
dc_brk[dc] |= 1 << ((unit & 03) + 8);
ttyoutput(0, tp);
break;
case TIOCCBRK:
dc_brk[dc] &= ~(1 << ((unit & 03) + 8));
ttyoutput(0, tp);
break;
case TIOCSDTR:
(void) dcmctl(dev, DML_DTR|DML_RTS, DMBIS);
break;
case TIOCCDTR:
(void) dcmctl(dev, DML_DTR|DML_RTS, DMBIC);
break;
case TIOCMSET:
(void) dcmctl(dev, *(int *)data, DMSET);
break;
case TIOCMBIS:
(void) dcmctl(dev, *(int *)data, DMBIS);
break;
case TIOCMBIC:
(void) dcmctl(dev, *(int *)data, DMBIC);
break;
case TIOCMGET:
*(int *)data = dcmctl(dev, 0, DMGET);
break;
default:
return (ENOTTY);
}
return (0);
}
dcparam(tp, t)
register struct tty *tp;
register struct termios *t;
{
register dcregs *dcaddr;
register int lpr;
register int cflag = t->c_cflag;
int unit = minor(tp->t_dev);
int ospeed = ttspeedtab(t->c_ospeed, dcspeedtab);
/* check requested parameters */
if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed) ||
(cflag & CSIZE) == CS5 || (cflag & CSIZE) == CS6 ||
(pmax_boardtype == DS_PMAX && t->c_ospeed == 19200))
return (EINVAL);
/* and copy to tty */
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = cflag;
dcaddr = (dcregs *)dcpdma[unit].p_addr;
/*
* Handle console cases specially.
*/
if (cn_tab.cn_screen) {
if (unit == DCKBD_PORT) {
dcaddr->dc_lpr = LPR_RXENAB | LPR_8_BIT_CHAR |
LPR_B4800 | DCKBD_PORT;
MachEmptyWriteBuffer();
return (0);
} else if (unit == DCMOUSE_PORT) {
dcaddr->dc_lpr = LPR_RXENAB | LPR_B4800 | LPR_OPAR |
LPR_PARENB | LPR_8_BIT_CHAR | DCMOUSE_PORT;
MachEmptyWriteBuffer();
return (0);
}
} else if (tp->t_dev == cn_tab.cn_dev) {
dcaddr->dc_lpr = LPR_RXENAB | LPR_8_BIT_CHAR |
LPR_B9600 | unit;
MachEmptyWriteBuffer();
return (0);
}
if (ospeed == 0) {
(void) dcmctl(unit, 0, DMSET); /* hang up line */
return (0);
}
lpr = LPR_RXENAB | ospeed | (unit & 03);
if ((cflag & CSIZE) == CS7)
lpr |= LPR_7_BIT_CHAR;
else
lpr |= LPR_8_BIT_CHAR;
if (cflag & PARENB)
lpr |= LPR_PARENB;
if (cflag & PARODD)
lpr |= LPR_OPAR;
if (cflag & CSTOPB)
lpr |= LPR_2_STOP;
dcaddr->dc_lpr = lpr;
MachEmptyWriteBuffer();
return (0);
}
/*
* Check for interrupts from all devices.
*/
void
dcintr(unit)
register int unit;
{
register dcregs *dcaddr;
register unsigned csr;
unit <<= 2;
dcaddr = (dcregs *)dcpdma[unit].p_addr;
while ((csr = dcaddr->dc_csr) & (CSR_RDONE | CSR_TRDY)) {
if (csr & CSR_RDONE)
dcrint(unit);
if (csr & CSR_TRDY)
dcxint(&dc_tty[unit + ((csr >> 8) & 03)]);
}
}
dcrint(unit)
register int unit;
{
register dcregs *dcaddr;
register struct tty *tp;
register int c, cc;
register struct tty *tp0;
int overrun = 0;
dcaddr = (dcregs *)dcpdma[unit].p_addr;
tp0 = &dc_tty[unit];
while ((c = dcaddr->dc_rbuf) < 0) { /* char present */
cc = c & 0xff;
tp = tp0 + ((c >> 8) & 03);
if ((c & RBUF_OERR) && overrun == 0) {
log(LOG_WARNING, "dc%d,%d: silo overflow\n", unit >> 2,
(c >> 8) & 03);
overrun = 1;
}
/* the keyboard requires special translation */
if (tp == &dc_tty[DCKBD_PORT] && cn_tab.cn_screen) {
#ifdef KADB
if (cc == LK_DO) {
spl0();
kdbpanic();
return;
}
#endif
#ifdef DEBUG
debugChar = cc;
#endif
if (dcDivertXInput) {
(*dcDivertXInput)(cc);
return;
}
if ((cc = kbdMapChar(cc)) < 0)
return;
} else if (tp == &dc_tty[DCMOUSE_PORT] && dcMouseButtons) {
register MouseReport *mrp;
static MouseReport currentRep;
mrp = &currentRep;
mrp->byteCount++;
if (cc & MOUSE_START_FRAME) {
/*
* The first mouse report byte (button state).
*/
mrp->state = cc;
if (mrp->byteCount > 1)
mrp->byteCount = 1;
} else if (mrp->byteCount == 2) {
/*
* The second mouse report byte (delta x).
*/
mrp->dx = cc;
} else if (mrp->byteCount == 3) {
/*
* The final mouse report byte (delta y).
*/
mrp->dy = cc;
mrp->byteCount = 0;
if (mrp->dx != 0 || mrp->dy != 0) {
/*
* If the mouse moved,
* post a motion event.
*/
(*dcMouseEvent)(mrp);
}
(*dcMouseButtons)(mrp);
}
return;
}
if (!(tp->t_state & TS_ISOPEN)) {
wakeup((caddr_t)&tp->t_rawq);
#ifdef PORTSELECTOR
if (!(tp->t_state & TS_WOPEN))
#endif
return;
}
if (c & RBUF_FERR)
cc |= TTY_FE;
if (c & RBUF_PERR)
cc |= TTY_PE;
(*linesw[tp->t_line].l_rint)(cc, tp);
}
DELAY(10);
}
void
dcxint(tp)
register struct tty *tp;
{
register struct pdma *dp;
register dcregs *dcaddr;
dp = (struct pdma *)tp->t_addr;
if (dp->p_mem < dp->p_end) {
dcaddr = (dcregs *)dp->p_addr;
dcaddr->dc_tdr = dc_brk[(tp - dc_tty) >> 2] | *dp->p_mem++;
MachEmptyWriteBuffer();
DELAY(10);
return;
}
tp->t_state &= ~TS_BUSY;
if (tp->t_state & TS_FLUSH)
tp->t_state &= ~TS_FLUSH;
else {
ndflush(&tp->t_outq, (u_char *)(dp->p_mem) - tp->t_outq.c_cf);
dp->p_end = dp->p_mem = tp->t_outq.c_cf;
}
if (tp->t_line)
(*linesw[tp->t_line].l_start)(tp);
else
dcstart(tp);
if (tp->t_outq.c_cc == 0 || !(tp->t_state & TS_BUSY)) {
((dcregs *)dp->p_addr)->dc_tcr &= ~(1 << (minor(tp->t_dev) & 03));
MachEmptyWriteBuffer();
DELAY(10);
}
}
void
dcstart(tp)
register struct tty *tp;
{
register struct pdma *dp;
register dcregs *dcaddr;
register int cc;
int s;
dp = (struct pdma *)tp->t_addr;
dcaddr = (dcregs *)dp->p_addr;
s = spltty();
if (tp->t_state & (TS_TIMEOUT|TS_BUSY|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;
/* handle console specially */
if (tp == &dc_tty[DCKBD_PORT] && cn_tab.cn_screen) {
while (tp->t_outq.c_cc > 0) {
cc = getc(&tp->t_outq) & 0x7f;
cnputc(cc);
}
/*
* After we flush the output queue we may need to wake
* up the process that made the output.
*/
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);
}
goto out;
}
if (tp->t_flags & (RAW|LITOUT))
cc = ndqb(&tp->t_outq, 0);
else {
cc = ndqb(&tp->t_outq, 0200);
if (cc == 0) {
cc = getc(&tp->t_outq);
timeout(ttrstrt, (void *)tp, (cc & 0x7f) + 6);
tp->t_state |= TS_TIMEOUT;
goto out;
}
}
tp->t_state |= TS_BUSY;
dp->p_end = dp->p_mem = tp->t_outq.c_cf;
dp->p_end += cc;
dcaddr->dc_tcr |= 1 << (minor(tp->t_dev) & 03);
MachEmptyWriteBuffer();
out:
splx(s);
}
/*
* Stop output on a line.
*/
/*ARGSUSED*/
dcstop(tp, flag)
register struct tty *tp;
{
register struct pdma *dp;
register int s;
dp = (struct pdma *)tp->t_addr;
s = spltty();
if (tp->t_state & TS_BUSY) {
dp->p_end = dp->p_mem;
if (!(tp->t_state & TS_TTSTOP))
tp->t_state |= TS_FLUSH;
}
splx(s);
}
dcmctl(dev, bits, how)
dev_t dev;
int bits, how;
{
register dcregs *dcaddr;
register int unit, mbits;
int b, s;
register int msr;
unit = minor(dev);
b = 1 << (unit & 03);
dcaddr = (dcregs *)dcpdma[unit].p_addr;
s = spltty();
/* only channel 2 has modem control (what about line 3?) */
mbits = DML_DTR | DML_DSR | DML_CAR;
switch (unit & 03) {
case 2:
mbits = 0;
if (dcaddr->dc_tcr & TCR_DTR2)
mbits |= DML_DTR;
msr = dcaddr->dc_msr;
if (msr & MSR_CD2)
mbits |= DML_CAR;
if (msr & MSR_DSR2) {
if (pmax_boardtype == DS_PMAX)
mbits |= DML_CAR | DML_DSR;
else
mbits |= DML_DSR;
}
break;
case 3:
if (pmax_boardtype != DS_PMAX) {
mbits = 0;
if (dcaddr->dc_tcr & TCR_DTR3)
mbits |= DML_DTR;
msr = dcaddr->dc_msr;
if (msr & MSR_CD3)
mbits |= DML_CAR;
if (msr & MSR_DSR3)
mbits |= DML_DSR;
}
}
switch (how) {
case DMSET:
mbits = bits;
break;
case DMBIS:
mbits |= bits;
break;
case DMBIC:
mbits &= ~bits;
break;
case DMGET:
(void) splx(s);
return (mbits);
}
switch (unit & 03) {
case 2:
if (mbits & DML_DTR)
dcaddr->dc_tcr |= TCR_DTR2;
else
dcaddr->dc_tcr &= ~TCR_DTR2;
break;
case 3:
if (pmax_boardtype != DS_PMAX) {
if (mbits & DML_DTR)
dcaddr->dc_tcr |= TCR_DTR3;
else
dcaddr->dc_tcr &= ~TCR_DTR3;
}
}
if ((mbits & DML_DTR) && (dcsoftCAR[unit >> 2] & b))
dc_tty[unit].t_state |= TS_CARR_ON;
(void) splx(s);
return (mbits);
}
/*
* This is called by timeout() periodically.
* Check to see if modem status bits have changed.
*/
void
dcscan(arg)
void *arg;
{
register dcregs *dcaddr;
register struct tty *tp;
register int i, bit, car;
int s;
s = spltty();
/* only channel 2 has modem control (what about line 3?) */
dcaddr = (dcregs *)dcpdma[i = 2].p_addr;
tp = &dc_tty[i];
bit = TCR_DTR2;
if (dcsoftCAR[i >> 2] & bit)
car = 1;
else
car = dcaddr->dc_msr & MSR_DSR2;
if (car) {
/* carrier present */
if (!(tp->t_state & TS_CARR_ON))
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
} else if ((tp->t_state & TS_CARR_ON) &&
(*linesw[tp->t_line].l_modem)(tp, 0) == 0)
dcaddr->dc_tcr &= ~bit;
splx(s);
timeout(dcscan, (void *)0, hz);
}
/*
* ----------------------------------------------------------------------------
*
* dcGetc --
*
* Read a character from a serial line.
*
* Results:
* A character read from the serial port.
*
* Side effects:
* None.
*
* ----------------------------------------------------------------------------
*/
int
dcGetc(dev)
dev_t dev;
{
register dcregs *dcaddr;
register int c;
int s;
dcaddr = (dcregs *)dcpdma[minor(dev)].p_addr;
if (!dcaddr)
return (0);
s = spltty();
for (;;) {
if (!(dcaddr->dc_csr & CSR_RDONE))
continue;
c = dcaddr->dc_rbuf;
DELAY(10);
if (((c >> 8) & 03) == (minor(dev) & 03))
break;
}
splx(s);
return (c & 0xff);
}
/*
* Send a char on a port, non interrupt driven.
*/
void
dcPutc(dev, c)
dev_t dev;
int c;
{
register dcregs *dcaddr;
register u_short tcr;
register int timeout;
int s, line;
s = spltty();
dcaddr = (dcregs *)dcpdma[minor(dev)].p_addr;
tcr = dcaddr->dc_tcr;
dcaddr->dc_tcr = tcr | (1 << minor(dev));
MachEmptyWriteBuffer();
DELAY(10);
while (1) {
/*
* Wait for transmitter to be not busy.
*/
timeout = 1000000;
while (!(dcaddr->dc_csr & CSR_TRDY) && timeout > 0)
timeout--;
if (timeout == 0) {
printf("dcPutc: timeout waiting for CSR_TRDY\n");
break;
}
line = (dcaddr->dc_csr >> 8) & 3;
/*
* Check to be sure its the right port.
*/
if (line != minor(dev)) {
tcr |= 1 << line;
dcaddr->dc_tcr &= ~(1 << line);
MachEmptyWriteBuffer();
DELAY(10);
continue;
}
/*
* Start sending the character.
*/
dcaddr->dc_tdr = dc_brk[0] | (c & 0xff);
MachEmptyWriteBuffer();
DELAY(10);
/*
* Wait for character to be sent.
*/
while (1) {
/*
* cc -O bug: this code produces and infinite loop!
* while (!(dcaddr->dc_csr & CSR_TRDY))
* ;
*/
timeout = 1000000;
while (!(dcaddr->dc_csr & CSR_TRDY) && timeout > 0)
timeout--;
line = (dcaddr->dc_csr >> 8) & 3;
if (line != minor(dev)) {
tcr |= 1 << line;
dcaddr->dc_tcr &= ~(1 << line);
MachEmptyWriteBuffer();
DELAY(10);
continue;
}
dcaddr->dc_tcr &= ~(1 << minor(dev));
MachEmptyWriteBuffer();
DELAY(10);
break;
}
break;
}
/*
* Enable interrupts for other lines which became ready.
*/
if (tcr & 0xF) {
dcaddr->dc_tcr = tcr;
MachEmptyWriteBuffer();
DELAY(10);
}
splx(s);
}
#endif /* NDC */
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