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NetBSD/sys/dev/ic/com.c
mycroft 13e9b38191 Slight optimization in soft input routine.
1997-11-03 08:20:35 +00:00

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/* $NetBSD: com.c,v 1.128 1997/11/03 08:20:35 mycroft Exp $ */
/*-
* Copyright (c) 1993, 1994, 1995, 1996, 1997
* Charles M. Hannum. All rights reserved.
*
* Interrupt processing and hardware flow control partly based on code from
* Onno van der Linden and Gordon Ross.
*
* 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 Charles M. Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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) 1991 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 7.5 (Berkeley) 5/16/91
*/
/*
* COM driver, uses National Semiconductor NS16450/NS16550AF UART
* Supports automatic hardware flow control on StarTech ST16C650A UART
*/
#include "rnd.h"
#if NRND > 0 && defined(RND_COM)
#include <sys/rnd.h>
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/select.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 <sys/types.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#include <dev/ic/ns16550reg.h>
#include <dev/ic/st16650reg.h>
#ifdef COM_HAYESP
#include <dev/ic/hayespreg.h>
#endif
#define com_lcr com_cfcr
#include <dev/cons.h>
#include "com.h"
#ifdef COM_HAYESP
int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc));
#endif
#if defined(DDB) || defined(KGDB)
static void com_enable_debugport __P((struct com_softc *));
#endif
void com_attach_subr __P((struct com_softc *sc));
int comspeed __P((long, long));
static u_char cflag2lcr __P((tcflag_t));
int comparam __P((struct tty *, struct termios *));
void comstart __P((struct tty *));
void comstop __P((struct tty *, int));
int comhwiflow __P((struct tty *, int));
void com_loadchannelregs __P((struct com_softc *));
void com_hwiflow __P((struct com_softc *));
void com_break __P((struct com_softc *, int));
void com_modem __P((struct com_softc *, int));
void com_iflush __P((struct com_softc *));
int com_common_getc __P((bus_space_tag_t, bus_space_handle_t));
void com_common_putc __P((bus_space_tag_t, bus_space_handle_t, int));
/* XXX: These belong elsewhere */
cdev_decl(com);
bdev_decl(com);
int comcngetc __P((dev_t));
void comcnputc __P((dev_t, int));
void comcnpollc __P((dev_t, int));
#define integrate static inline
#ifdef __GENERIC_SOFT_INTERRUPTS
void comsoft __P((void *));
#else
#ifndef alpha
void comsoft __P((void));
#else
void comsoft __P((void *));
#endif
#endif
integrate void com_rxsoft __P((struct com_softc *, struct tty *));
integrate void com_txsoft __P((struct com_softc *, struct tty *));
integrate void com_stsoft __P((struct com_softc *, struct tty *));
integrate void com_schedrx __P((struct com_softc *));
void comdiag __P((void *));
struct cfdriver com_cd = {
NULL, "com", DV_TTY
};
/*
* Make this an option variable one can patch.
* But be warned: this must be a power of 2!
*/
u_int com_rbuf_size = COM_RING_SIZE;
/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */
u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4;
u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4;
static int comconsaddr;
static bus_space_tag_t comconstag;
static bus_space_handle_t comconsioh;
static int comconsattached;
static int comconsrate;
static tcflag_t comconscflag;
static u_char tiocm_xxx2mcr __P((int));
#ifndef __GENERIC_SOFT_INTERRUPTS
#ifdef alpha
volatile int com_softintr_scheduled;
#endif
#endif
#ifdef KGDB
#include <sys/kgdb.h>
static int com_kgdb_addr;
static bus_space_tag_t com_kgdb_iot;
static bus_space_handle_t com_kgdb_ioh;
static int com_kgdb_attached;
int com_kgdb_getc __P((void *));
void com_kgdb_putc __P((void *, int));
#endif /* KGDB */
#define COMUNIT(x) (minor(x))
int
comspeed(speed, frequency)
long speed, frequency;
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
#if 0
if (speed == 0)
return (0);
#endif
if (speed <= 0)
return (-1);
x = divrnd(frequency / 16, speed);
if (x <= 0)
return (-1);
err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > COM_TOLERANCE)
return (-1);
return (x);
#undef divrnd(n, q)
}
#ifdef COM_DEBUG
int com_debug = 0;
void comstatus __P((struct com_softc *, char *));
void
comstatus(sc, str)
struct com_softc *sc;
char *str;
{
struct tty *tp = sc->sc_tty;
printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n",
sc->sc_dev.dv_xname, str,
ISSET(tp->t_cflag, CLOCAL) ? "+" : "-",
ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-",
ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-",
ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-",
sc->sc_tx_stopped ? "+" : "-");
printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n",
sc->sc_dev.dv_xname, str,
ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-",
ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-",
ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-",
ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-",
sc->sc_rx_flags);
}
#endif
int
comprobe1(iot, ioh, iobase)
bus_space_tag_t iot;
bus_space_handle_t ioh;
int iobase;
{
/* force access to id reg */
bus_space_write_1(iot, ioh, com_lcr, 0);
bus_space_write_1(iot, ioh, com_iir, 0);
if (bus_space_read_1(iot, ioh, com_iir) & 0x38)
return (0);
return (1);
}
#ifdef COM_HAYESP
int
comprobeHAYESP(hayespioh, sc)
bus_space_handle_t hayespioh;
struct com_softc *sc;
{
char val, dips;
int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
bus_space_tag_t iot = sc->sc_iot;
/*
* Hayes ESP cards have two iobases. One is for compatibility with
* 16550 serial chips, and at the same ISA PC base addresses. The
* other is for ESP-specific enhanced features, and lies at a
* different addressing range entirely (0x140, 0x180, 0x280, or 0x300).
*/
/* Test for ESP signature */
if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0)
return (0);
/*
* ESP is present at ESP enhanced base address; unknown com port
*/
/* Get the dip-switch configurations */
bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS);
dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1);
/* Determine which com port this ESP card services: bits 0,1 of */
/* dips is the port # (0-3); combaselist[val] is the com_iobase */
if (sc->sc_iobase != combaselist[dips & 0x03])
return (0);
printf(": ESP");
/* Check ESP Self Test bits. */
/* Check for ESP version 2.0: bits 4,5,6 == 010 */
bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST);
val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */
val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2);
if ((val & 0x70) < 0x20) {
printf("-old (%o)", val & 0x70);
/* we do not support the necessary features */
return (0);
}
/* Check for ability to emulate 16550: bit 8 == 1 */
if ((dips & 0x80) == 0) {
printf(" slave");
/* XXX Does slave really mean no 16550 support?? */
return (0);
}
/*
* If we made it this far, we are a full-featured ESP v2.0 (or
* better), at the correct com port address.
*/
SET(sc->sc_hwflags, COM_HW_HAYESP);
printf(", 1024 byte fifo\n");
return (1);
}
#endif
#if defined(DDB) || defined(KGDB)
static void
com_enable_debugport(sc)
struct com_softc *sc;
{
int s;
/* Turn on line break interrupt, set carrier. */
s = splserial();
sc->sc_ier = IER_ERXRDY;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier);
SET(sc->sc_mcr, MCR_DTR | MCR_RTS);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr);
splx(s);
}
#endif
void
com_attach_subr(sc)
struct com_softc *sc;
{
int iobase = sc->sc_iobase;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct tty *tp;
#ifdef COM16650
u_int8_t lcr;
#endif
#ifdef COM_HAYESP
int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 };
int *hayespp;
#endif
/* Disable interrupts before configuring the device. */
sc->sc_ier = 0;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier);
if (iot == comconstag && iobase == comconsaddr) {
comconsattached = 1;
/* Make sure the console is always "hardwired". */
delay(1000); /* wait for output to finish */
SET(sc->sc_hwflags, COM_HW_CONSOLE);
SET(sc->sc_swflags, TIOCFLAG_SOFTCAR);
}
#ifdef COM_HAYESP
/* Look for a Hayes ESP board. */
for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) {
bus_space_handle_t hayespioh;
#define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */
if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh))
continue;
if (comprobeHAYESP(hayespioh, sc)) {
sc->sc_hayespioh = hayespioh;
sc->sc_fifolen = 1024;
/* Set 16550 compatibility mode */
bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETMODE);
bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
HAYESP_MODE_FIFO|HAYESP_MODE_RTS|
HAYESP_MODE_SCALE);
/* Set RTS/CTS flow control */
bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETFLOWTYPE);
bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_RTS);
bus_space_write_1(iot, hayespioh, HAYESP_CMD2, HAYESP_FLOW_CTS);
/* Set flow control levels */
bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_SETRXFLOW);
bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
HAYESP_HIBYTE(HAYESP_RXHIWMARK));
bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
HAYESP_LOBYTE(HAYESP_RXHIWMARK));
bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
HAYESP_HIBYTE(HAYESP_RXLOWMARK));
bus_space_write_1(iot, hayespioh, HAYESP_CMD2,
HAYESP_LOBYTE(HAYESP_RXLOWMARK));
break;
}
bus_space_unmap(iot, hayespioh, HAYESP_NPORTS);
}
/* No ESP; look for other things. */
if (*hayespp == 0) {
#endif
sc->sc_fifolen = 1;
/* look for a NS 16550AF UART with FIFOs */
bus_space_write_1(iot, ioh, com_fifo,
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14);
delay(100);
if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK)
== IIR_FIFO_MASK)
if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14)
== FIFO_TRIGGER_14) {
SET(sc->sc_hwflags, COM_HW_FIFO);
#ifdef COM16650
/*
* IIR changes into the EFR if LCR is set to LCR_EERS
* on 16650s. We also know IIR != 0 at this point.
* Write 0 into the EFR, and read it. If the result
* is 0, we have a 16650.
*
* Older 16650s were broken; the test to detect them
* is taken from the Linux driver. Apparently
* setting DLAB enable gives access to the EFR on
* these chips.
*/
lcr = bus_space_read_1(iot, ioh, com_lcr);
bus_space_write_1(iot, ioh, com_lcr, LCR_EERS);
bus_space_write_1(iot, ioh, com_efr, 0);
if (bus_space_read_1(iot, ioh, com_efr) == 0) {
bus_space_write_1(iot, ioh, com_lcr,
lcr | LCR_DLAB);
if (bus_space_read_1(iot, ioh, com_efr) == 0) {
CLR(sc->sc_hwflags, COM_HW_FIFO);
sc->sc_fifolen = 0;
} else {
SET(sc->sc_hwflags, COM_HW_FLOW);
sc->sc_fifolen = 32;
}
} else
#endif
sc->sc_fifolen = 16;
#ifdef COM16650
bus_space_write_1(iot, ioh, com_lcr, lcr);
if (sc->sc_fifolen == 0)
printf(": st16650, broken fifo\n");
else if (sc->sc_fifolen == 32)
printf(": st16650a, working fifo\n");
else
#endif
printf(": ns16550a, working fifo\n");
} else
printf(": ns16550, broken fifo\n");
else
printf(": ns8250 or ns16450, no fifo\n");
bus_space_write_1(iot, ioh, com_fifo, 0);
#ifdef COM_HAYESP
}
#endif
tp = ttymalloc();
tp->t_oproc = comstart;
tp->t_param = comparam;
tp->t_hwiflow = comhwiflow;
tty_attach(tp);
sc->sc_tty = tp;
sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_WAITOK);
sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1);
if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN))
SET(sc->sc_mcr, MCR_IENABLE);
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
int maj;
/* locate the major number */
for (maj = 0; maj < nchrdev; maj++)
if (cdevsw[maj].d_open == comopen)
break;
cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit);
#ifdef DDB
com_enable_debugport(sc);
#endif
printf("%s: console\n", sc->sc_dev.dv_xname);
}
#ifdef KGDB
/*
* Allow kgdb to "take over" this port. If this is
* the kgdb device, it has exclusive use.
*/
if (iot == com_kgdb_iot && iobase == com_kgdb_addr) {
com_kgdb_attached = 1;
SET(sc->sc_hwflags, COM_HW_KGDB);
com_enable_debugport(sc);
printf("%s: kgdb\n", sc->sc_dev.dv_xname);
}
#endif
#ifdef __GENERIC_SOFT_INTERRUPTS
sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc);
#endif
#if NRND > 0 && defined(RND_COM)
rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname,
RND_TYPE_TTY);
#endif
}
int
comopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
int unit = COMUNIT(dev);
struct com_softc *sc;
struct tty *tp;
int s, s2;
int error = 0;
if (unit >= com_cd.cd_ndevs)
return (ENXIO);
sc = com_cd.cd_devs[unit];
if (!sc)
return (ENXIO);
#ifdef KGDB
/*
* If this is the kgdb port, no other use is permitted.
*/
if (ISSET(sc->sc_hwflags, COM_HW_KGDB))
return (EBUSY);
#endif
tp = sc->sc_tty;
if (ISSET(tp->t_state, TS_ISOPEN) &&
ISSET(tp->t_state, TS_XCLUDE) &&
p->p_ucred->cr_uid != 0)
return (EBUSY);
s = spltty();
/* We need to set this early for the benefit of comsoft(). */
SET(tp->t_state, TS_WOPEN);
/*
* Do the following iff this is a first open.
*/
if (!ISSET(tp->t_state, TS_ISOPEN)) {
struct termios t;
tp->t_dev = dev;
s2 = splserial();
/* Turn on interrupts. */
sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier);
/* Fetch the current modem control status, needed later. */
sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr);
splx(s2);
/*
* Initialize the termios status to the defaults. Add in the
* sticky bits from TIOCSFLAGS.
*/
t.c_ispeed = 0;
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
t.c_ospeed = comconsrate;
t.c_cflag = comconscflag;
} else {
t.c_ospeed = TTYDEF_SPEED;
t.c_cflag = TTYDEF_CFLAG;
}
if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL))
SET(t.c_cflag, CLOCAL);
if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS))
SET(t.c_cflag, CRTSCTS);
if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF))
SET(t.c_cflag, MDMBUF);
(void) comparam(tp, &t);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
ttychars(tp);
ttsetwater(tp);
/*
* Turn on DTR. We must always do this, even if carrier is not
* present, because otherwise we'd have to use TIOCSDTR
* immediately after setting CLOCAL, which applications do not
* expect. We always assert DTR while the device is open
* unless explicitly requested to deassert it.
*/
com_modem(sc, 1);
s2 = splserial();
/* Clear the input ring, and unblock. */
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = com_rbuf_size;
com_iflush(sc);
CLR(sc->sc_rx_flags, RX_ANY_BLOCK);
com_hwiflow(sc);
#ifdef COM_DEBUG
if (com_debug)
comstatus(sc, "comopen ");
#endif
splx(s2);
}
error = 0;
/* If we're doing a blocking open... */
if (!ISSET(flag, O_NONBLOCK))
/* ...then wait for carrier. */
while (!ISSET(tp->t_state, TS_CARR_ON) &&
!ISSET(tp->t_cflag, CLOCAL | MDMBUF)) {
error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
ttopen, 0);
if (error) {
/*
* If the open was interrupted and nobody
* else has the device open, then hang up.
*/
if (!ISSET(tp->t_state, TS_ISOPEN)) {
com_modem(sc, 0);
CLR(tp->t_state, TS_WOPEN);
ttwakeup(tp);
}
break;
}
SET(tp->t_state, TS_WOPEN);
}
splx(s);
if (error == 0)
error = (*linesw[tp->t_line].l_open)(dev, tp);
return (error);
}
int
comclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)];
struct tty *tp = sc->sc_tty;
int s;
/* XXX This is for cons.c. */
if (!ISSET(tp->t_state, TS_ISOPEN))
return (0);
(*linesw[tp->t_line].l_close)(tp, flag);
ttyclose(tp);
s = splserial();
/* If we were asserting flow control, then deassert it. */
SET(sc->sc_rx_flags, RX_IBUF_BLOCKED);
com_hwiflow(sc);
splx(s);
/* Clear any break condition set with TIOCSBRK. */
com_break(sc, 0);
/*
* Hang up if necessary. Wait a bit, so the other side has time to
* notice even if we immediately open the port again.
*/
if (ISSET(tp->t_cflag, HUPCL)) {
com_modem(sc, 0);
(void) tsleep(sc, TTIPRI, ttclos, hz);
}
s = splserial();
/* Turn off interrupts. */
#ifdef DDB
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
sc->sc_ier = IER_ERXRDY; /* interrupt on break */
else
#endif
sc->sc_ier = 0;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier);
splx(s);
return (0);
}
int
comread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)];
struct tty *tp = sc->sc_tty;
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
int
comwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)];
struct tty *tp = sc->sc_tty;
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
struct tty *
comtty(dev)
dev_t dev;
{
struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)];
struct tty *tp = sc->sc_tty;
return (tp);
}
static u_char
tiocm_xxx2mcr(data)
int data;
{
u_char m = 0;
if (ISSET(data, TIOCM_DTR))
SET(m, MCR_DTR);
if (ISSET(data, TIOCM_RTS))
SET(m, MCR_RTS);
return m;
}
int
comioctl(dev, cmd, data, flag, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)];
struct tty *tp = sc->sc_tty;
int error;
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:
com_break(sc, 1);
break;
case TIOCCBRK:
com_break(sc, 0);
break;
case TIOCSDTR:
com_modem(sc, 1);
break;
case TIOCCDTR:
com_modem(sc, 0);
break;
case TIOCGFLAGS:
*(int *)data = sc->sc_swflags;
break;
case TIOCSFLAGS:
error = suser(p->p_ucred, &p->p_acflag);
if (error)
return (error);
sc->sc_swflags = *(int *)data;
break;
case TIOCMSET:
CLR(sc->sc_mcr, MCR_DTR | MCR_RTS);
/*FALLTHROUGH*/
case TIOCMBIS:
SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data));
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr);
break;
case TIOCMBIC:
CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data));
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr);
break;
case TIOCMGET: {
u_char m;
int bits = 0;
m = sc->sc_mcr;
if (ISSET(m, MCR_DTR))
SET(bits, TIOCM_DTR);
if (ISSET(m, MCR_RTS))
SET(bits, TIOCM_RTS);
m = sc->sc_msr;
if (ISSET(m, MSR_DCD))
SET(bits, TIOCM_CD);
if (ISSET(m, MSR_CTS))
SET(bits, TIOCM_CTS);
if (ISSET(m, MSR_DSR))
SET(bits, TIOCM_DSR);
if (ISSET(m, MSR_RI | MSR_TERI))
SET(bits, TIOCM_RI);
if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier))
SET(bits, TIOCM_LE);
*(int *)data = bits;
break;
}
default:
return (ENOTTY);
}
#ifdef COM_DEBUG
if (com_debug)
comstatus(sc, "comioctl ");
#endif
return (0);
}
integrate void
com_schedrx(sc)
struct com_softc *sc;
{
sc->sc_rx_ready = 1;
/* Wake up the poller. */
#ifdef __GENERIC_SOFT_INTERRUPTS
softintr_schedule(sc->sc_si);
#else
#ifndef alpha
setsoftserial();
#else
if (!com_softintr_scheduled) {
com_softintr_scheduled = 1;
timeout(comsoft, NULL, 1);
}
#endif
#endif
}
void
com_break(sc, onoff)
struct com_softc *sc;
int onoff;
{
int s;
s = splserial();
if (onoff)
SET(sc->sc_lcr, LCR_SBREAK);
else
CLR(sc->sc_lcr, LCR_SBREAK);
if (!sc->sc_heldchange) {
if (sc->sc_tx_busy) {
sc->sc_heldtbc = sc->sc_tbc;
sc->sc_tbc = 0;
sc->sc_heldchange = 1;
} else
com_loadchannelregs(sc);
}
splx(s);
}
void
com_modem(sc, onoff)
struct com_softc *sc;
int onoff;
{
int s;
s = splserial();
if (onoff)
SET(sc->sc_mcr, sc->sc_mcr_dtr);
else
CLR(sc->sc_mcr, sc->sc_mcr_dtr);
if (!sc->sc_heldchange) {
if (sc->sc_tx_busy) {
sc->sc_heldtbc = sc->sc_tbc;
sc->sc_tbc = 0;
sc->sc_heldchange = 1;
} else
com_loadchannelregs(sc);
}
splx(s);
}
static u_char
cflag2lcr(cflag)
tcflag_t cflag;
{
u_char lcr = 0;
switch (ISSET(cflag, CSIZE)) {
case CS5:
SET(lcr, LCR_5BITS);
break;
case CS6:
SET(lcr, LCR_6BITS);
break;
case CS7:
SET(lcr, LCR_7BITS);
break;
case CS8:
SET(lcr, LCR_8BITS);
break;
}
if (ISSET(cflag, PARENB)) {
SET(lcr, LCR_PENAB);
if (!ISSET(cflag, PARODD))
SET(lcr, LCR_PEVEN);
}
if (ISSET(cflag, CSTOPB))
SET(lcr, LCR_STOPB);
return (lcr);
}
int
comparam(tp, t)
struct tty *tp;
struct termios *t;
{
struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)];
int ospeed = comspeed(t->c_ospeed, sc->sc_frequency);
u_char lcr;
int s;
/* Check requested parameters. */
if (ospeed < 0)
return (EINVAL);
if (t->c_ispeed && t->c_ispeed != t->c_ospeed)
return (EINVAL);
/*
* For the console, always force CLOCAL and !HUPCL, so that the port
* is always active.
*/
if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) ||
ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
SET(t->c_cflag, CLOCAL);
CLR(t->c_cflag, HUPCL);
}
lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag);
s = splserial();
sc->sc_lcr = lcr;
/*
* If we're not in a mode that assumes a connection is present, then
* ignore carrier changes.
*/
if (ISSET(t->c_cflag, CLOCAL | MDMBUF))
sc->sc_msr_dcd = 0;
else
sc->sc_msr_dcd = MSR_DCD;
/*
* Set the flow control pins depending on the current flow control
* mode.
*/
if (ISSET(t->c_cflag, CRTSCTS)) {
sc->sc_mcr_dtr = MCR_DTR;
sc->sc_mcr_rts = MCR_RTS;
sc->sc_msr_cts = MSR_CTS;
sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS;
} else if (ISSET(t->c_cflag, MDMBUF)) {
/*
* For DTR/DCD flow control, make sure we don't toggle DTR for
* carrier detection.
*/
sc->sc_mcr_dtr = 0;
sc->sc_mcr_rts = MCR_DTR;
sc->sc_msr_cts = MSR_DCD;
sc->sc_efr = 0;
} else {
/*
* If no flow control, then always set RTS. This will make
* the other side happy if it mistakenly thinks we're doing
* RTS/CTS flow control.
*/
sc->sc_mcr_dtr = MCR_DTR | MCR_RTS;
sc->sc_mcr_rts = 0;
sc->sc_msr_cts = 0;
sc->sc_efr = 0;
if (ISSET(sc->sc_mcr, MCR_DTR))
SET(sc->sc_mcr, MCR_RTS);
else
CLR(sc->sc_mcr, MCR_RTS);
}
sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd;
#if 0
if (ospeed == 0)
CLR(sc->sc_mcr, sc->sc_mcr_dtr);
else
SET(sc->sc_mcr, sc->sc_mcr_dtr);
#endif
sc->sc_dlbl = ospeed;
sc->sc_dlbh = ospeed >> 8;
/*
* Set the FIFO threshold based on the receive speed.
*
* * If it's a low speed, it's probably a mouse or some other
* interactive device, so set the threshold low.
* * If it's a high speed, trim the trigger level down to prevent
* overflows.
* * Otherwise set it a bit higher.
*/
if (ISSET(sc->sc_hwflags, COM_HW_HAYESP))
sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8;
else if (ISSET(sc->sc_hwflags, COM_HW_FIFO))
sc->sc_fifo = FIFO_ENABLE |
(t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 :
t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4);
else
sc->sc_fifo = 0;
/* And copy to tty. */
tp->t_ispeed = 0;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = t->c_cflag;
if (!sc->sc_heldchange) {
if (sc->sc_tx_busy) {
sc->sc_heldtbc = sc->sc_tbc;
sc->sc_tbc = 0;
sc->sc_heldchange = 1;
} else
com_loadchannelregs(sc);
}
if (!ISSET(t->c_cflag, CHWFLOW)) {
/* Disable the high water mark. */
sc->sc_r_hiwat = 0;
sc->sc_r_lowat = 0;
if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) {
CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
com_schedrx(sc);
}
if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED);
com_hwiflow(sc);
}
} else {
sc->sc_r_hiwat = com_rbuf_hiwat;
sc->sc_r_lowat = com_rbuf_lowat;
}
splx(s);
/*
* Update the tty layer's idea of the carrier bit, in case we changed
* CLOCAL or MDMBUF. We don't hang up here; we only do that by
* explicit request.
*/
(void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD));
#ifdef COM_DEBUG
if (com_debug)
comstatus(sc, "comparam ");
#endif
if (!ISSET(t->c_cflag, CHWFLOW)) {
if (sc->sc_tx_stopped) {
sc->sc_tx_stopped = 0;
comstart(tp);
}
}
return (0);
}
void
com_iflush(sc)
struct com_softc *sc;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* flush any pending I/O */
while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY))
(void) bus_space_read_1(iot, ioh, com_data);
}
void
com_loadchannelregs(sc)
struct com_softc *sc;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* XXXXX necessary? */
com_iflush(sc);
bus_space_write_1(iot, ioh, com_ier, 0);
if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) {
bus_space_write_1(iot, ioh, com_lcr, LCR_EERS);
bus_space_write_1(iot, ioh, com_efr, sc->sc_efr);
}
bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB);
bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl);
bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh);
bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr);
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr);
bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo);
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
}
int
comhwiflow(tp, block)
struct tty *tp;
int block;
{
struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)];
int s;
if (sc->sc_mcr_rts == 0)
return (0);
s = splserial();
if (block) {
if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
SET(sc->sc_rx_flags, RX_TTY_BLOCKED);
com_hwiflow(sc);
}
} else {
if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) {
CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
com_schedrx(sc);
}
if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_TTY_BLOCKED);
com_hwiflow(sc);
}
}
splx(s);
return (1);
}
/*
* (un)block input via hw flowcontrol
*/
void
com_hwiflow(sc)
struct com_softc *sc;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
if (sc->sc_mcr_rts == 0)
return;
if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) {
CLR(sc->sc_mcr, sc->sc_mcr_rts);
CLR(sc->sc_mcr_active, sc->sc_mcr_rts);
} else {
SET(sc->sc_mcr, sc->sc_mcr_rts);
SET(sc->sc_mcr_active, sc->sc_mcr_rts);
}
bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active);
}
void
comstart(tp)
struct tty *tp;
{
struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)];
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int s;
s = spltty();
if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP))
goto out;
if (sc->sc_tx_stopped)
goto out;
if (tp->t_outq.c_cc <= tp->t_lowat) {
if (ISSET(tp->t_state, TS_ASLEEP)) {
CLR(tp->t_state, TS_ASLEEP);
wakeup(&tp->t_outq);
}
selwakeup(&tp->t_wsel);
if (tp->t_outq.c_cc == 0)
goto out;
}
/* Grab the first contiguous region of buffer space. */
{
u_char *tba;
int tbc;
tba = tp->t_outq.c_cf;
tbc = ndqb(&tp->t_outq, 0);
(void)splserial();
sc->sc_tba = tba;
sc->sc_tbc = tbc;
}
SET(tp->t_state, TS_BUSY);
sc->sc_tx_busy = 1;
/* Enable transmit completion interrupts if necessary. */
if (!ISSET(sc->sc_ier, IER_ETXRDY)) {
SET(sc->sc_ier, IER_ETXRDY);
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
}
/* Output the first chunk of the contiguous buffer. */
{
int n;
n = sc->sc_tbc;
if (n > sc->sc_fifolen)
n = sc->sc_fifolen;
bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n);
sc->sc_tbc -= n;
sc->sc_tba += n;
}
out:
splx(s);
return;
}
/*
* Stop output on a line.
*/
void
comstop(tp, flag)
struct tty *tp;
int flag;
{
struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)];
int s;
s = splserial();
if (ISSET(tp->t_state, TS_BUSY)) {
/* Stop transmitting at the next chunk. */
sc->sc_tbc = 0;
sc->sc_heldtbc = 0;
if (!ISSET(tp->t_state, TS_TTSTOP))
SET(tp->t_state, TS_FLUSH);
}
splx(s);
}
void
comdiag(arg)
void *arg;
{
struct com_softc *sc = arg;
int overflows, floods;
int s;
s = splserial();
overflows = sc->sc_overflows;
sc->sc_overflows = 0;
floods = sc->sc_floods;
sc->sc_floods = 0;
sc->sc_errors = 0;
splx(s);
log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n",
sc->sc_dev.dv_xname,
overflows, overflows == 1 ? "" : "s",
floods, floods == 1 ? "" : "s");
}
integrate void
com_rxsoft(sc, tp)
struct com_softc *sc;
struct tty *tp;
{
int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint;
u_char *get, *end;
u_int cc, scc;
u_char lsr;
int code;
int s;
end = sc->sc_ebuf;
get = sc->sc_rbget;
scc = cc = com_rbuf_size - sc->sc_rbavail;
if (cc == com_rbuf_size) {
sc->sc_floods++;
if (sc->sc_errors++ == 0)
timeout(comdiag, sc, 60 * hz);
}
while (cc) {
code = get[0];
lsr = get[1];
if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) {
if (ISSET(lsr, LSR_OE)) {
sc->sc_overflows++;
if (sc->sc_errors++ == 0)
timeout(comdiag, sc, 60 * hz);
}
if (ISSET(lsr, LSR_BI | LSR_FE))
SET(code, TTY_FE);
if (ISSET(lsr, LSR_PE))
SET(code, TTY_PE);
}
if ((*rint)(code, tp) == -1) {
/*
* The line discipline's buffer is out of space.
*/
if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
/*
* We're either not using flow control, or the
* line discipline didn't tell us to block for
* some reason. Either way, we have no way to
* know when there's more space available, so
* just drop the rest of the data.
*/
get += cc << 1;
if (get >= end)
get -= com_rbuf_size << 1;
cc = 0;
} else {
/*
* Don't schedule any more receive processing
* until the line discipline tells us there's
* space available (through comhwiflow()).
* Leave the rest of the data in the input
* buffer.
*/
SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
}
break;
}
get += 2;
if (get >= end)
get = sc->sc_rbuf;
cc--;
}
if (cc != scc) {
sc->sc_rbget = get;
s = splserial();
cc = sc->sc_rbavail += scc - cc;
/* Buffers should be ok again, release possible block. */
if (cc >= sc->sc_r_lowat) {
if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED);
SET(sc->sc_ier, IER_ERXRDY);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier);
}
if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED);
com_hwiflow(sc);
}
}
splx(s);
}
}
integrate void
com_txsoft(sc, tp)
struct com_softc *sc;
struct tty *tp;
{
CLR(tp->t_state, TS_BUSY);
if (ISSET(tp->t_state, TS_FLUSH))
CLR(tp->t_state, TS_FLUSH);
else
ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf));
(*linesw[tp->t_line].l_start)(tp);
}
integrate void
com_stsoft(sc, tp)
struct com_softc *sc;
struct tty *tp;
{
u_char msr, delta;
int s;
s = splserial();
msr = sc->sc_msr;
delta = sc->sc_msr_delta;
sc->sc_msr_delta = 0;
splx(s);
if (ISSET(delta, sc->sc_msr_dcd)) {
/*
* Inform the tty layer that carrier detect changed.
*/
(void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD));
}
if (ISSET(delta, sc->sc_msr_cts)) {
/* Block or unblock output according to flow control. */
if (ISSET(msr, sc->sc_msr_cts)) {
sc->sc_tx_stopped = 0;
(*linesw[tp->t_line].l_start)(tp);
} else {
sc->sc_tx_stopped = 1;
}
}
#ifdef COM_DEBUG
if (com_debug)
comstatus(sc, "com_stsoft");
#endif
}
#ifdef __GENERIC_SOFT_INTERRUPTS
void
comsoft(arg)
void *arg;
{
struct com_softc *sc = arg;
struct tty *tp;
{
#else
void
#ifndef alpha
comsoft()
#else
comsoft(arg)
void *arg;
#endif
{
struct com_softc *sc;
struct tty *tp;
int unit;
#ifdef alpha
int s;
s = splsoftserial();
com_softintr_scheduled = 0;
#endif
for (unit = 0; unit < com_cd.cd_ndevs; unit++) {
sc = com_cd.cd_devs[unit];
if (sc == NULL)
continue;
tp = sc->sc_tty;
if (tp == NULL || !ISSET(tp->t_state, TS_ISOPEN | TS_WOPEN))
continue;
#endif
tp = sc->sc_tty;
if (sc->sc_rx_ready) {
sc->sc_rx_ready = 0;
com_rxsoft(sc, tp);
}
if (sc->sc_st_check) {
sc->sc_st_check = 0;
com_stsoft(sc, tp);
}
if (sc->sc_tx_done) {
sc->sc_tx_done = 0;
com_txsoft(sc, tp);
}
}
#ifndef __GENERIC_SOFT_INTERRUPTS
#ifdef alpha
splx(s);
#endif
#endif
}
int
comintr(arg)
void *arg;
{
struct com_softc *sc = arg;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
u_char *put, *end;
u_int cc;
u_char lsr, iir;
iir = bus_space_read_1(iot, ioh, com_iir);
if (ISSET(iir, IIR_NOPEND))
return (0);
end = sc->sc_ebuf;
put = sc->sc_rbput;
cc = sc->sc_rbavail;
do {
u_char msr, delta;
lsr = bus_space_read_1(iot, ioh, com_lsr);
#if defined(DDB) || defined(KGDB)
if (ISSET(lsr, LSR_BI)) {
#ifdef DDB
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
Debugger();
continue;
}
#endif
#ifdef KGDB
if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) {
kgdb_connect(1);
continue;
}
#endif
}
#endif /* DDB || KGDB */
if (ISSET(lsr, LSR_RCV_MASK) &&
!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
while (cc > 0) {
put[0] = bus_space_read_1(iot, ioh, com_data);
put[1] = lsr;
put += 2;
if (put >= end)
put = sc->sc_rbuf;
cc--;
lsr = bus_space_read_1(iot, ioh, com_lsr);
if (!ISSET(lsr, LSR_RCV_MASK))
break;
}
/*
* Current string of incoming characters ended because
* no more data was available or we ran out of space.
* Schedule a receive event if any data was received.
* If we're out of space, turn off receive interrupts.
*/
sc->sc_rbput = put;
sc->sc_rbavail = cc;
if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED))
sc->sc_rx_ready = 1;
/*
* See if we are in danger of overflowing a buffer. If
* so, use hardware flow control to ease the pressure.
*/
if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) &&
cc < sc->sc_r_hiwat) {
SET(sc->sc_rx_flags, RX_IBUF_BLOCKED);
com_hwiflow(sc);
}
/*
* If we're out of space, disable receive interrupts
* until the queue has drained a bit.
*/
if (!cc) {
SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED);
CLR(sc->sc_ier, IER_ERXRDY);
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
}
} else {
if ((iir & IIR_IMASK) == IIR_RXRDY) {
bus_space_write_1(iot, ioh, com_ier, 0);
delay(10);
bus_space_write_1(iot, ioh, com_ier,sc->sc_ier);
iir = IIR_NOPEND;
continue;
}
}
msr = bus_space_read_1(iot, ioh, com_msr);
delta = msr ^ sc->sc_msr;
sc->sc_msr = msr;
if (ISSET(delta, sc->sc_msr_mask)) {
SET(sc->sc_msr_delta, delta);
/*
* Stop output immediately if we lose the output
* flow control signal or carrier detect.
*/
if (ISSET(~msr, sc->sc_msr_mask)) {
sc->sc_tbc = 0;
sc->sc_heldtbc = 0;
#ifdef COM_DEBUG
if (com_debug)
comstatus(sc, "comintr ");
#endif
}
sc->sc_st_check = 1;
}
} while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND));
/*
* Done handling any receive interrupts. See if data can be
* transmitted as well. Schedule tx done event if no data left
* and tty was marked busy.
*/
if (ISSET(lsr, LSR_TXRDY)) {
/*
* If we've delayed a parameter change, do it now, and restart
* output.
*/
if (sc->sc_heldchange) {
com_loadchannelregs(sc);
sc->sc_heldchange = 0;
sc->sc_tbc = sc->sc_heldtbc;
sc->sc_heldtbc = 0;
}
/* Output the next chunk of the contiguous buffer, if any. */
if (sc->sc_tbc > 0) {
int n;
n = sc->sc_tbc;
if (n > sc->sc_fifolen)
n = sc->sc_fifolen;
bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n);
sc->sc_tbc -= n;
sc->sc_tba += n;
} else {
/* Disable transmit completion interrupts if necessary. */
if (ISSET(sc->sc_ier, IER_ETXRDY)) {
CLR(sc->sc_ier, IER_ETXRDY);
bus_space_write_1(iot, ioh, com_ier, sc->sc_ier);
}
if (sc->sc_tx_busy) {
sc->sc_tx_busy = 0;
sc->sc_tx_done = 1;
}
}
}
/* Wake up the poller. */
#ifdef __GENERIC_SOFT_INTERRUPTS
softintr_schedule(sc->sc_si);
#else
#ifndef alpha
setsoftserial();
#else
if (!com_softintr_scheduled) {
com_softintr_scheduled = 1;
timeout(comsoft, NULL, 1);
}
#endif
#endif
#if NRND > 0 && defined(RND_COM)
rnd_add_uint32(&sc->rnd_source, iir | lsr);
#endif
return (1);
}
/*
* The following functions are polled getc and putc routines, shared
* by the console and kgdb glue.
*/
int
com_common_getc(iot, ioh)
bus_space_tag_t iot;
bus_space_handle_t ioh;
{
int s = splserial();
u_char stat, c;
while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY))
;
c = bus_space_read_1(iot, ioh, com_data);
stat = bus_space_read_1(iot, ioh, com_iir);
splx(s);
return (c);
}
void
com_common_putc(iot, ioh, c)
bus_space_tag_t iot;
bus_space_handle_t ioh;
int c;
{
int s = splserial();
u_char stat;
int timo;
/* wait for any pending transmission to finish */
timo = 50000;
while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY)
&& --timo)
;
bus_space_write_1(iot, ioh, com_data, c);
/* wait for this transmission to complete */
timo = 1500000;
while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY)
&& --timo)
;
/* clear any interrupts generated by this transmission */
stat = bus_space_read_1(iot, ioh, com_iir);
splx(s);
}
/*
* Initialize UART to known state.
*/
int
cominit(iot, iobase, rate, frequency, cflag, iohp)
bus_space_tag_t iot;
int iobase;
int rate, frequency;
tcflag_t cflag;
bus_space_handle_t *iohp;
{
bus_space_handle_t ioh;
if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh))
return (ENOMEM); /* ??? */
bus_space_write_1(iot, ioh, com_lcr, LCR_EERS);
bus_space_write_1(iot, ioh, com_efr, 0);
bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB);
rate = comspeed(rate, frequency);
bus_space_write_1(iot, ioh, com_dlbl, rate);
bus_space_write_1(iot, ioh, com_dlbh, rate >> 8);
bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag));
bus_space_write_1(iot, ioh, com_mcr, 0);
bus_space_write_1(iot, ioh, com_fifo,
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
bus_space_write_1(iot, ioh, com_ier, 0);
*iohp = ioh;
return (0);
}
/*
* Following are all routines needed for COM to act as console
*/
int
comcnattach(iot, iobase, rate, frequency, cflag)
bus_space_tag_t iot;
int iobase;
int rate, frequency;
tcflag_t cflag;
{
int res;
static struct consdev comcons = {
NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL
};
res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh);
if (res)
return (res);
cn_tab = &comcons;
comconstag = iot;
comconsaddr = iobase;
comconsrate = rate;
comconscflag = cflag;
return (0);
}
int
comcngetc(dev)
dev_t dev;
{
return (com_common_getc(comconstag, comconsioh));
}
/*
* Console kernel output character routine.
*/
void
comcnputc(dev, c)
dev_t dev;
int c;
{
com_common_putc(comconstag, comconsioh, c);
}
void
comcnpollc(dev, on)
dev_t dev;
int on;
{
}
#ifdef KGDB
int
com_kgdb_attach(iot, iobase, rate, frequency, cflag)
bus_space_tag_t iot;
int iobase;
int rate, frequency;
tcflag_t cflag;
{
int res;
if (iot == comconstag && iobase == comconsaddr)
return (EBUSY); /* cannot share with console */
res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh);
if (res)
return (res);
kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL);
kgdb_dev = 123; /* unneeded, only to satisfy some tests */
com_kgdb_iot = iot;
com_kgdb_addr = iobase;
return (0);
}
/* ARGSUSED */
int
com_kgdb_getc(arg)
void *arg;
{
return (com_common_getc(com_kgdb_iot, com_kgdb_ioh));
}
/* ARGSUSED */
void
com_kgdb_putc(arg, c)
void *arg;
int c;
{
return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c));
}
#endif /* KGDB */
/* helper function to identify the com ports used by
console or KGDB (and not yet autoconf attached) */
int
com_is_console(iot, iobase, ioh)
bus_space_tag_t iot;
int iobase;
bus_space_handle_t *ioh;
{
bus_space_handle_t help;
if (!comconsattached &&
iot == comconstag && iobase == comconsaddr)
help = comconsioh;
#ifdef KGDB
else if (!com_kgdb_attached &&
iot == com_kgdb_iot && iobase == com_kgdb_addr)
help = com_kgdb_ioh;
#endif
else
return (0);
if (ioh)
*ioh = help;
return (1);
}
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