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Only reset FIFO if changing baud rate. From John Kohl (slightly edited).

This commit is contained in:
mycroft 1994-09-16 02:50:39 +00:00
parent 23ece5babc
commit c7003d37d3
3 changed files with 72 additions and 27 deletions
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33
sys/arch/i386/isa/com.c
View File

@ -32,7 +32,7 @@
* SUCH DAMAGE.
*
* from: @(#)com.c 7.5 (Berkeley) 5/16/91
* $Id: com.c,v 1.35 1994/08/24 07:25:18 mycroft Exp $
* $Id: com.c,v 1.36 1994/09/16 02:50:39 mycroft Exp $
*/
/*
@ -296,6 +296,11 @@ comopen(dev, flag, mode, p)
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);
@ -555,22 +560,32 @@ comparam(tp, t)
s = spltty();
/* 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 |
(t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
if (ospeed == 0)
outb(iobase + com_mcr, sc->sc_mcr &= ~MCR_DTR);
else
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) {

33
sys/dev/ic/com.c
View File

@ -32,7 +32,7 @@
* SUCH DAMAGE.
*
* from: @(#)com.c 7.5 (Berkeley) 5/16/91
* $Id: com.c,v 1.35 1994/08/24 07:25:18 mycroft Exp $
* $Id: com.c,v 1.36 1994/09/16 02:50:39 mycroft Exp $
*/
/*
@ -296,6 +296,11 @@ comopen(dev, flag, mode, p)
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);
@ -555,22 +560,32 @@ comparam(tp, t)
s = spltty();
/* 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 |
(t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
if (ospeed == 0)
outb(iobase + com_mcr, sc->sc_mcr &= ~MCR_DTR);
else
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) {

33
sys/dev/isa/com.c
View File

@ -32,7 +32,7 @@
* SUCH DAMAGE.
*
* from: @(#)com.c 7.5 (Berkeley) 5/16/91
* $Id: com.c,v 1.35 1994/08/24 07:25:18 mycroft Exp $
* $Id: com.c,v 1.36 1994/09/16 02:50:39 mycroft Exp $
*/
/*
@ -296,6 +296,11 @@ comopen(dev, flag, mode, p)
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);
@ -555,22 +560,32 @@ comparam(tp, t)
s = spltty();
/* 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 |
(t->c_ispeed <= 1200 ? FIFO_TRIGGER_1 : FIFO_TRIGGER_8));
if (ospeed == 0)
outb(iobase + com_mcr, sc->sc_mcr &= ~MCR_DTR);
else
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) {