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NetBSD/sys/arch/vax/uba/dhu.c

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/* $NetBSD: dhu.c,v 1.6 1996/09/02 06:44:21 mycroft Exp $ */
/*
* Copyright (c) 1996 Ken C. Wellsch. All rights reserved.
* Copyright (c) 1992, 1993
* 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.
*/
#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 <sys/device.h>
#include <machine/trap.h>
#include <vax/uba/ubavar.h>
#include <vax/uba/dhureg.h>
/* A DHU-11 has 16 ports while a DHV-11 has only 8. We use 16 by default */
#define NDHULINE 16
#define DHU_M2U(c) ((c)>>4) /* convert minor(dev) to unit # */
#define DHU_LINE(u) ((u)&0xF) /* extract line # from minor(dev) */
struct dhu_softc {
struct device sc_dev; /* Device struct used by config */
dhuregs * sc_addr; /* controller reg address */
int sc_type; /* controller type, DHU or DHV */
struct {
struct tty *dhu_tty; /* what we work on */
int dhu_state; /* to manage TX output status */
int dhu_txaddr; /* UBA map address to TX buf */
short dhu_cc; /* character count on TX */
short dhu_modem; /* modem bits state */
} sc_dhu[NDHULINE];
};
#define IS_DHU 16 /* Unibus DHU-11 board linecount */
#define IS_DHV 8 /* Q-bus DHV-11 or DHQ-11 */
#define STATE_IDLE 000 /* no current output in progress */
#define STATE_DMA_RUNNING 001 /* DMA TX in progress */
#define STATE_DMA_STOPPED 002 /* DMA TX was aborted */
#define STATE_TX_ONE_CHAR 004 /* did a single char directly */
/* Flags used to monitor modem bits, make them understood outside driver */
#define DML_DTR TIOCM_DTR
#define DML_RTS TIOCM_RTS
#define DML_CTS TIOCM_CTS
#define DML_DCD TIOCM_CD
#define DML_RI TIOCM_RI
#define DML_DSR TIOCM_DSR
#define DML_BRK 0100000 /* no equivalent, we will mask */
/* On a stock DHV, channel pairs (0/1, 2/3, etc.) must use */
/* a baud rate from the same group. So limiting to B is likely */
/* best, although clone boards like the ABLE QHV allow all settings. */
static struct speedtab dhuspeedtab[] = {
{ 0, 0 }, /* Groups */
{ 50, DHU_LPR_B50 }, /* A */
{ 75, DHU_LPR_B75 }, /* B */
{ 110, DHU_LPR_B110 }, /* A and B */
{ 134, DHU_LPR_B134 }, /* A and B */
{ 150, DHU_LPR_B150 }, /* B */
{ 300, DHU_LPR_B300 }, /* A and B */
{ 600, DHU_LPR_B600 }, /* A and B */
{ 1200, DHU_LPR_B1200 }, /* A and B */
{ 1800, DHU_LPR_B1800 }, /* B */
{ 2000, DHU_LPR_B2000 }, /* B */
{ 2400, DHU_LPR_B2400 }, /* A and B */
{ 4800, DHU_LPR_B4800 }, /* A and B */
{ 7200, DHU_LPR_B7200 }, /* A */
{ 9600, DHU_LPR_B9600 }, /* A and B */
{ 19200, DHU_LPR_B19200 }, /* B */
{ 38400, DHU_LPR_B38400 }, /* A */
{ -1, -1 }
};
static int dhu_match __P((struct device *, void *, void *));
static void dhu_attach __P((struct device *, struct device *, void *));
static void dhurint __P((int));
static void dhuxint __P((int));
static void dhustart __P((struct tty *));
static int dhuparam __P((struct tty *, struct termios *));
static int dhuiflow __P((struct tty *, int));
static unsigned dhumctl __P((struct dhu_softc *,int, int, int));
int dhuopen __P((dev_t, int, int, struct proc *));
int dhuclose __P((dev_t, int, int, struct proc *));
int dhuread __P((dev_t, struct uio *, int));
int dhuwrite __P((dev_t, struct uio *, int));
int dhuioctl __P((dev_t, u_long, caddr_t, int, struct proc *));
void dhustop __P((struct tty *, int));
struct tty * dhutty __P((dev_t));
struct cfdriver dhu_cd = {
NULL, "dhu", DV_TTY
};
struct cfattach dhu_ca = {
sizeof(struct dhu_softc), dhu_match, dhu_attach
};
/* Autoconfig handles: setup the controller to interrupt, */
/* then complete the housecleaning for full operation */
static int
dhu_match(parent, match, aux)
struct device *parent;
void *match, *aux;
{
struct uba_attach_args *ua = aux;
register dhuregs *dhuaddr;
register int n;
dhuaddr = (dhuregs *) ua->ua_addr;
/* Reset controller to initialize, enable TX/RX interrupts */
/* to catch floating vector info elsewhere when completed */
dhuaddr->dhu_csr = (DHU_CSR_MASTER_RESET | DHU_CSR_RXIE | DHU_CSR_TXIE);
/* Now wait up to 3 seconds for self-test to complete. */
for (n = 0; n < 300; n++) {
DELAY(10000);
if ((dhuaddr->dhu_csr & DHU_CSR_MASTER_RESET) == 0)
break;
}
/* If the RESET did not clear after 3 seconds, */
/* the controller must be broken. */
if (n >= 300)
return 0;
/* Check whether diagnostic run has signalled a failure. */
if ((dhuaddr->dhu_csr & DHU_CSR_DIAG_FAIL) != 0)
return 0;
/* Register the RX interrupt handler */
ua->ua_ivec = dhurint;
return 1;
}
static void
dhu_attach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
register struct dhu_softc *sc = (void *)self;
register struct uba_attach_args *ua = aux;
register dhuregs *dhuaddr;
register unsigned c;
register int n;
dhuaddr = (dhuregs *) ua->ua_addr;
/* Process the 8 bytes of diagnostic info put into */
/* the FIFO following the master reset operation. */
printf("\n%s:", self->dv_xname);
for (n = 0; n < 8; n++) {
c = dhuaddr->dhu_rbuf;
if ((c&DHU_DIAG_CODE) == DHU_DIAG_CODE) {
if ((c&0200) == 0000)
printf(" rom(%d) version %d",
((c>>1)&01), ((c>>2)&037));
else if (((c>>2)&07) != 0)
printf(" diag-error(proc%d)=%x",
((c>>1)&01), ((c>>2)&07));
}
}
printf("\n");
c = dhuaddr->dhu_stat; /* get flag to distinguish DHU from DHV */
sc->sc_addr = dhuaddr;
sc->sc_type = (c & DHU_STAT_DHU)? IS_DHU: IS_DHV;
/* Now stuff TX interrupt handler in place */
ubasetvec(self, ua->ua_cvec + 1, dhuxint);
return;
}
/* Receiver Interrupt */
static void
dhurint(unit)
int unit;
{
struct dhu_softc *sc = dhu_cd.cd_devs[unit];
register dhuregs *dhuaddr;
register struct tty *tp;
register int cc, line;
register unsigned c, delta;
int overrun = 0;
dhuaddr = sc->sc_addr;
while ((c = dhuaddr->dhu_rbuf) & DHU_RBUF_DATA_VALID) {
/* Ignore diagnostic FIFO entries. */
if ((c & DHU_DIAG_CODE) == DHU_DIAG_CODE)
continue;
cc = c & 0xFF;
line = DHU_LINE(c>>8);
tp = sc->sc_dhu[line].dhu_tty;
/* LINK.TYPE is set so we get modem control FIFO entries */
if ((c & DHU_DIAG_CODE) == DHU_MODEM_CODE) {
c = (c << 8);
/* Do MDMBUF flow control, wakeup sleeping opens */
if (c & DHU_STAT_DCD) {
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)
(void) dhumctl(sc, line, 0, DMSET);
/* Do CRTSCTS flow control */
delta = c ^ sc->sc_dhu[line].dhu_modem;
sc->sc_dhu[line].dhu_modem = c;
if ((delta & DHU_STAT_CTS) &&
(tp->t_state & TS_ISOPEN) &&
(tp->t_cflag & CRTSCTS)) {
if (c & DHU_STAT_CTS) {
tp->t_state &= ~TS_TTSTOP;
ttstart(tp);
} else {
tp->t_state |= TS_TTSTOP;
dhustop(tp, 0);
}
}
continue;
}
if (!(tp->t_state & TS_ISOPEN)) {
wakeup((caddr_t)&tp->t_rawq);
continue;
}
if ((c & DHU_RBUF_OVERRUN_ERR) && overrun == 0) {
log(LOG_WARNING, "%s: silo overflow, line %d\n",
sc->sc_dev.dv_xname, line);
overrun = 1;
}
/* A BREAK key will appear as a NULL with a framing error */
if (c & DHU_RBUF_FRAMING_ERR)
cc |= TTY_FE;
if (c & DHU_RBUF_PARITY_ERR)
cc |= TTY_PE;
(*linesw[tp->t_line].l_rint)(cc, tp);
}
return;
}
/* Transmitter Interrupt */
static void
dhuxint(unit)
int unit;
{
register struct dhu_softc *sc = dhu_cd.cd_devs[unit];
register dhuregs *dhuaddr;
register struct tty *tp;
register int line;
dhuaddr = sc->sc_addr;
line = DHU_LINE(dhuaddr->dhu_csr_hi);
tp = sc->sc_dhu[line].dhu_tty;
tp->t_state &= ~TS_BUSY;
if (tp->t_state & TS_FLUSH)
tp->t_state &= ~TS_FLUSH;
else {
if (sc->sc_dhu[line].dhu_state == STATE_DMA_STOPPED)
sc->sc_dhu[line].dhu_cc -= dhuaddr->dhu_tbufcnt;
ndflush(&tp->t_outq, sc->sc_dhu[line].dhu_cc);
sc->sc_dhu[line].dhu_cc = 0;
}
sc->sc_dhu[line].dhu_state = STATE_IDLE;
if (tp->t_line)
(*linesw[tp->t_line].l_start)(tp);
else
dhustart(tp);
return;
}
int
dhuopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
register dhuregs *dhuaddr;
register struct tty *tp;
register int unit, line;
struct dhu_softc *sc;
int s, error = 0;
unit = DHU_M2U(minor(dev));
line = DHU_LINE(minor(dev));
if (unit >= dhu_cd.cd_ndevs || dhu_cd.cd_devs[unit] == NULL)
return (ENXIO);
sc = dhu_cd.cd_devs[unit];
if (line >= sc->sc_type)
return ENXIO;
tp = sc->sc_dhu[line].dhu_tty;
if (tp == NULL) {
tp = sc->sc_dhu[line].dhu_tty = ttymalloc();
if (tp == NULL)
return ENXIO;
sc->sc_dhu[line].dhu_state = STATE_IDLE;
sc->sc_dhu[line].dhu_txaddr = uballoc(
sc->sc_dev.dv_parent->dv_unit,
tp->t_outq.c_cs, tp->t_outq.c_cn, 0);
dhuaddr = sc->sc_addr;
s = spltty();
dhuaddr->dhu_csr_lo = (DHU_CSR_RXIE | line);
sc->sc_dhu[line].dhu_modem = dhuaddr->dhu_stat;
(void) splx(s);
}
tp->t_oproc = dhustart;
tp->t_param = dhuparam;
tp->t_hwiflow = dhuiflow;
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 = TTYDEF_SPEED;
}
(void) dhuparam(tp, &tp->t_termios);
ttsetwater(tp);
} else if ((tp->t_state & TS_XCLUDE) && curproc->p_ucred->cr_uid != 0)
return (EBUSY);
/* Use DMBIS and *not* DMSET or else we clobber incoming bits */
if (dhumctl(sc, line, DML_DTR|DML_RTS, DMBIS) & DML_DCD)
tp->t_state |= TS_CARR_ON;
s = spltty();
while (!(flag & O_NONBLOCK) && !(tp->t_cflag & CLOCAL) &&
!(tp->t_state & TS_CARR_ON)) {
tp->t_state |= TS_WOPEN;
error = ttysleep(tp, (caddr_t)&tp->t_rawq,
TTIPRI | PCATCH, ttopen, 0);
if (error)
break;
}
(void) splx(s);
if (error)
return (error);
return ((*linesw[tp->t_line].l_open)(dev, tp));
}
/*ARGSUSED*/
int
dhuclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
register struct tty *tp;
register int unit, line;
struct dhu_softc *sc;
unit = DHU_M2U(minor(dev));
line = DHU_LINE(minor(dev));
sc = dhu_cd.cd_devs[unit];
tp = sc->sc_dhu[line].dhu_tty;
(*linesw[tp->t_line].l_close)(tp, flag);
/* Make sure a BREAK state is not left enabled. */
(void) dhumctl(sc, line, DML_BRK, DMBIC);
/* Do a hangup if so required. */
if ((tp->t_cflag & HUPCL) || (tp->t_state & TS_WOPEN) ||
!(tp->t_state & TS_ISOPEN))
(void) dhumctl(sc, line, 0, DMSET);
return (ttyclose(tp));
}
int
dhuread(dev, uio, flag)
dev_t dev;
struct uio *uio;
{
register struct dhu_softc *sc;
register struct tty *tp;
sc = dhu_cd.cd_devs[DHU_M2U(minor(dev))];
tp = sc->sc_dhu[DHU_LINE(minor(dev))].dhu_tty;
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
int
dhuwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
{
register struct dhu_softc *sc;
register struct tty *tp;
sc = dhu_cd.cd_devs[DHU_M2U(minor(dev))];
tp = sc->sc_dhu[DHU_LINE(minor(dev))].dhu_tty;
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
/*ARGSUSED*/
int
dhuioctl(dev, cmd, data, flag, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
register struct dhu_softc *sc;
register struct tty *tp;
register int unit, line;
int error;
unit = DHU_M2U(minor(dev));
line = DHU_LINE(minor(dev));
sc = dhu_cd.cd_devs[unit];
tp = sc->sc_dhu[line].dhu_tty;
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:
(void) dhumctl(sc, line, DML_BRK, DMBIS);
break;
case TIOCCBRK:
(void) dhumctl(sc, line, DML_BRK, DMBIC);
break;
case TIOCSDTR:
(void) dhumctl(sc, line, DML_DTR|DML_RTS, DMBIS);
break;
case TIOCCDTR:
(void) dhumctl(sc, line, DML_DTR|DML_RTS, DMBIC);
break;
case TIOCMSET:
(void) dhumctl(sc, line, *(int *)data, DMSET);
break;
case TIOCMBIS:
(void) dhumctl(sc, line, *(int *)data, DMBIS);
break;
case TIOCMBIC:
(void) dhumctl(sc, line, *(int *)data, DMBIC);
break;
case TIOCMGET:
*(int *)data = (dhumctl(sc, line, 0, DMGET) & ~DML_BRK);
break;
default:
return (ENOTTY);
}
return (0);
}
struct tty *
dhutty(dev)
dev_t dev;
{
struct dhu_softc *sc = dhu_cd.cd_devs[DHU_M2U(minor(dev))];
struct tty *tp = sc->sc_dhu[DHU_LINE(minor(dev))].dhu_tty;
return (tp);
}
/*ARGSUSED*/
void
dhustop(tp, flag)
register struct tty *tp;
{
register struct dhu_softc *sc;
register dhuregs *dhuaddr;
register int line;
int s;
s = spltty();
if (tp->t_state & TS_BUSY) {
sc = dhu_cd.cd_devs[DHU_M2U(minor(tp->t_dev))];
line = DHU_LINE(minor(tp->t_dev));
if (sc->sc_dhu[line].dhu_state == STATE_DMA_RUNNING) {
sc->sc_dhu[line].dhu_state = STATE_DMA_STOPPED;
dhuaddr = sc->sc_addr;
dhuaddr->dhu_csr_lo = (DHU_CSR_RXIE | line);
dhuaddr->dhu_lnctrl |= DHU_LNCTRL_DMA_ABORT;
}
if (!(tp->t_state & TS_TTSTOP))
tp->t_state |= TS_FLUSH;
}
(void) splx(s);
}
static void
dhustart(tp)
register struct tty *tp;
{
register struct dhu_softc *sc;
register dhuregs *dhuaddr;
register int line, cc;
register int addr;
int s;
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;
cc = ndqb(&tp->t_outq, 0);
if (cc == 0)
goto out;
tp->t_state |= TS_BUSY;
sc = dhu_cd.cd_devs[DHU_M2U(minor(tp->t_dev))];
line = DHU_LINE(minor(tp->t_dev));
dhuaddr = sc->sc_addr;
dhuaddr->dhu_csr_lo = (DHU_CSR_RXIE | line);
sc->sc_dhu[line].dhu_cc = cc;
if (cc == 1) {
sc->sc_dhu[line].dhu_state = STATE_TX_ONE_CHAR;
dhuaddr->dhu_txchar = DHU_TXCHAR_DATA_VALID | *tp->t_outq.c_cf;
} else {
sc->sc_dhu[line].dhu_state = STATE_DMA_RUNNING;
addr = UBAI_ADDR(sc->sc_dhu[line].dhu_txaddr) +
(tp->t_outq.c_cf - tp->t_outq.c_cs);
dhuaddr->dhu_tbufcnt = cc;
dhuaddr->dhu_tbufad1 = (addr & 0xFFFF);
dhuaddr->dhu_tbufad2 = ((addr>>16) & 0x3F) |
DHU_TBUFAD2_TX_ENABLE;
dhuaddr->dhu_lnctrl &= ~DHU_LNCTRL_DMA_ABORT;
dhuaddr->dhu_tbufad2 |= DHU_TBUFAD2_DMA_START;
}
out:
(void) splx(s);
return;
}
static int
dhuparam(tp, t)
register struct tty *tp;
register struct termios *t;
{
struct dhu_softc *sc;
register dhuregs *dhuaddr;
register int cflag = t->c_cflag;
int ispeed = ttspeedtab(t->c_ispeed, dhuspeedtab);
int ospeed = ttspeedtab(t->c_ospeed, dhuspeedtab);
register unsigned lpr, lnctrl;
int unit, line;
int s;
unit = DHU_M2U(minor(tp->t_dev));
line = DHU_LINE(minor(tp->t_dev));
sc = dhu_cd.cd_devs[unit];
/* check requested parameters */
if (ospeed < 0 || ispeed < 0)
return (EINVAL);
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = cflag;
if (ospeed == 0) {
(void) dhumctl(sc, line, 0, DMSET); /* hang up line */
return (0);
}
s = spltty();
dhuaddr = sc->sc_addr;
dhuaddr->dhu_csr_lo = (DHU_CSR_RXIE | line);
lpr = ((ispeed&017)<<8) | ((ospeed&017)<<12) ;
switch (cflag & CSIZE) {
case CS5:
lpr |= DHU_LPR_5_BIT_CHAR;
break;
case CS6:
lpr |= DHU_LPR_6_BIT_CHAR;
break;
case CS7:
lpr |= DHU_LPR_7_BIT_CHAR;
break;
default:
lpr |= DHU_LPR_8_BIT_CHAR;
break;
}
if (cflag & PARENB)
lpr |= DHU_LPR_PARENB;
if (!(cflag & PARODD))
lpr |= DHU_LPR_EPAR;
if (cflag & CSTOPB)
lpr |= DHU_LPR_2_STOP;
dhuaddr->dhu_lpr = lpr;
dhuaddr->dhu_tbufad2 |= DHU_TBUFAD2_TX_ENABLE;
lnctrl = dhuaddr->dhu_lnctrl;
/* Setting LINK.TYPE enables modem signal change interrupts. */
lnctrl |= (DHU_LNCTRL_RX_ENABLE | DHU_LNCTRL_LINK_TYPE);
/* Enable the auto XON/XOFF feature on the controller */
if (t->c_iflag & IXON)
lnctrl |= DHU_LNCTRL_OAUTO;
else
lnctrl &= ~DHU_LNCTRL_OAUTO;
if (t->c_iflag & IXOFF)
lnctrl |= DHU_LNCTRL_IAUTO;
else
lnctrl &= ~DHU_LNCTRL_IAUTO;
dhuaddr->dhu_lnctrl = lnctrl;
(void) splx(s);
return (0);
}
static int
dhuiflow(tp, flag)
struct tty *tp;
int flag;
{
register struct dhu_softc *sc;
register int line = DHU_LINE(minor(tp->t_dev));
if (tp->t_cflag & CRTSCTS) {
sc = dhu_cd.cd_devs[DHU_M2U(minor(tp->t_dev))];
(void) dhumctl(sc, line, DML_RTS, ((flag)? DMBIC: DMBIS));
return (1);
}
return (0);
}
static unsigned
dhumctl(sc, line, bits, how)
struct dhu_softc *sc;
int line, bits, how;
{
register dhuregs *dhuaddr;
register unsigned status;
register unsigned lnctrl;
register unsigned mbits;
int s;
s = spltty();
dhuaddr = sc->sc_addr;
dhuaddr->dhu_csr_lo = (DHU_CSR_RXIE | line);
mbits = 0;
/* external signals as seen from the port */
status = dhuaddr->dhu_stat;
if (status & DHU_STAT_CTS)
mbits |= DML_CTS;
if (status & DHU_STAT_DCD)
mbits |= DML_DCD;
if (status & DHU_STAT_DSR)
mbits |= DML_DSR;
if (status & DHU_STAT_RI)
mbits |= DML_RI;
/* internal signals/state delivered to port */
lnctrl = dhuaddr->dhu_lnctrl;
if (lnctrl & DHU_LNCTRL_RTS)
mbits |= DML_RTS;
if (lnctrl & DHU_LNCTRL_DTR)
mbits |= DML_DTR;
if (lnctrl & DHU_LNCTRL_BREAK)
mbits |= DML_BRK;
switch (how) {
case DMSET:
mbits = bits;
break;
case DMBIS:
mbits |= bits;
break;
case DMBIC:
mbits &= ~bits;
break;
case DMGET:
(void) splx(s);
return (mbits);
}
if (mbits & DML_RTS)
lnctrl |= DHU_LNCTRL_RTS;
else
lnctrl &= ~DHU_LNCTRL_RTS;
if (mbits & DML_DTR)
lnctrl |= DHU_LNCTRL_DTR;
else
lnctrl &= ~DHU_LNCTRL_DTR;
if (mbits & DML_BRK)
lnctrl |= DHU_LNCTRL_BREAK;
else
lnctrl &= ~DHU_LNCTRL_BREAK;
dhuaddr->dhu_lnctrl = lnctrl;
(void) splx(s);
return (mbits);
}
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