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NetBSD/sys/arch/evbarm/dev/plcom.c

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/* $NetBSD: plcom.c,v 1.14 2006/02/20 16:50:36 thorpej Exp $ */
/*-
* Copyright (c) 2001 ARM Ltd
* 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. The name of the company 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 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) 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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) 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. 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 for the Prime Cell PL010 UART, which is similar to the 16C550,
* but has a completely different programmer's model.
* Derived from the NS16550AF com driver.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: plcom.c,v 1.14 2006/02/20 16:50:36 thorpej Exp $");
#include "opt_plcom.h"
#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "opt_lockdebug.h"
#include "opt_multiprocessor.h"
#include "rnd.h"
#if NRND > 0 && defined(RND_COM)
#include <sys/rnd.h>
#endif
/*
* Override cnmagic(9) macro before including <sys/systm.h>.
* We need to know if cn_check_magic triggered debugger, so set a flag.
* Callers of cn_check_magic must declare int cn_trapped = 0;
* XXX: this is *ugly*!
*/
#define cn_trap() \
do { \
console_debugger(); \
cn_trapped = 1; \
} while (/* CONSTCOND */ 0)
#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 <sys/timepps.h>
#include <sys/vnode.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <evbarm/dev/plcomreg.h>
#include <evbarm/dev/plcomvar.h>
#include <dev/cons.h>
static void plcom_enable_debugport (struct plcom_softc *);
void plcom_config (struct plcom_softc *);
void plcom_shutdown (struct plcom_softc *);
int plcomspeed (long, long);
static u_char cflag2lcr (tcflag_t);
int plcomparam (struct tty *, struct termios *);
void plcomstart (struct tty *);
int plcomhwiflow (struct tty *, int);
void plcom_loadchannelregs (struct plcom_softc *);
void plcom_hwiflow (struct plcom_softc *);
void plcom_break (struct plcom_softc *, int);
void plcom_modem (struct plcom_softc *, int);
void tiocm_to_plcom (struct plcom_softc *, u_long, int);
int plcom_to_tiocm (struct plcom_softc *);
void plcom_iflush (struct plcom_softc *);
int plcom_common_getc (dev_t, bus_space_tag_t, bus_space_handle_t);
void plcom_common_putc (dev_t, bus_space_tag_t, bus_space_handle_t, int);
int plcominit (bus_space_tag_t, bus_addr_t, int, int, tcflag_t,
bus_space_handle_t *);
dev_type_open(plcomopen);
dev_type_close(plcomclose);
dev_type_read(plcomread);
dev_type_write(plcomwrite);
dev_type_ioctl(plcomioctl);
dev_type_stop(plcomstop);
dev_type_tty(plcomtty);
dev_type_poll(plcompoll);
int plcomcngetc (dev_t);
void plcomcnputc (dev_t, int);
void plcomcnpollc (dev_t, int);
#define integrate static inline
#ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
void plcomsoft (void *);
#else
#ifndef __NO_SOFT_SERIAL_INTERRUPT
void plcomsoft (void);
#else
void plcomsoft (void *);
struct callout plcomsoft_callout = CALLOUT_INITIALIZER;
#endif
#endif
integrate void plcom_rxsoft (struct plcom_softc *, struct tty *);
integrate void plcom_txsoft (struct plcom_softc *, struct tty *);
integrate void plcom_stsoft (struct plcom_softc *, struct tty *);
integrate void plcom_schedrx (struct plcom_softc *);
void plcomdiag (void *);
extern struct cfdriver plcom_cd;
const struct cdevsw plcom_cdevsw = {
plcomopen, plcomclose, plcomread, plcomwrite, plcomioctl,
plcomstop, plcomtty, plcompoll, nommap, ttykqfilter, D_TTY
};
/*
* Make this an option variable one can patch.
* But be warned: this must be a power of 2!
*/
u_int plcom_rbuf_size = PLCOM_RING_SIZE;
/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */
u_int plcom_rbuf_hiwat = (PLCOM_RING_SIZE * 1) / 4;
u_int plcom_rbuf_lowat = (PLCOM_RING_SIZE * 3) / 4;
static int plcomconsunit = -1;
static bus_space_tag_t plcomconstag;
static bus_space_handle_t plcomconsioh;
static int plcomconsattached;
static int plcomconsrate;
static tcflag_t plcomconscflag;
static struct cnm_state plcom_cnm_state;
static int ppscap =
PPS_TSFMT_TSPEC |
PPS_CAPTUREASSERT |
PPS_CAPTURECLEAR |
#ifdef PPS_SYNC
PPS_HARDPPSONASSERT | PPS_HARDPPSONCLEAR |
#endif /* PPS_SYNC */
PPS_OFFSETASSERT | PPS_OFFSETCLEAR;
#ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
#ifdef __NO_SOFT_SERIAL_INTERRUPT
volatile int plcom_softintr_scheduled;
#endif
#endif
#ifdef KGDB
#include <sys/kgdb.h>
static int plcom_kgdb_unit;
static bus_space_tag_t plcom_kgdb_iot;
static bus_space_handle_t plcom_kgdb_ioh;
static int plcom_kgdb_attached;
int plcom_kgdb_getc (void *);
void plcom_kgdb_putc (void *, int);
#endif /* KGDB */
#define PLCOMUNIT_MASK 0x7ffff
#define PLCOMDIALOUT_MASK 0x80000
#define PLCOMUNIT(x) (minor(x) & PLCOMUNIT_MASK)
#define PLCOMDIALOUT(x) (minor(x) & PLCOMDIALOUT_MASK)
#define PLCOM_ISALIVE(sc) ((sc)->enabled != 0 && \
device_is_active(&(sc)->sc_dev))
#define BR BUS_SPACE_BARRIER_READ
#define BW BUS_SPACE_BARRIER_WRITE
#define PLCOM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, PLCOM_UART_SIZE, (f))
#define PLCOM_LOCK(sc) simple_lock(&(sc)->sc_lock)
#define PLCOM_UNLOCK(sc) simple_unlock(&(sc)->sc_lock)
int
plcomspeed(long speed, long 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 > PLCOM_TOLERANCE)
return -1;
return x;
#undef divrnd
}
#ifdef PLCOM_DEBUG
int plcom_debug = 0;
void plcomstatus (struct plcom_softc *, char *);
void
plcomstatus(struct plcom_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
plcomprobe1(bus_space_tag_t iot, bus_space_handle_t ioh)
{
int data;
/* Disable the UART. */
bus_space_write_1(iot, ioh, plcom_cr, 0);
/* Make sure the FIFO is off. */
bus_space_write_1(iot, ioh, plcom_lcr, LCR_8BITS);
/* Disable interrupts. */
bus_space_write_1(iot, ioh, plcom_iir, 0);
/* Make sure we swallow anything in the receiving register. */
data = bus_space_read_1(iot, ioh, plcom_dr);
if (bus_space_read_1(iot, ioh, plcom_lcr) != LCR_8BITS)
return 0;
data = bus_space_read_1(iot, ioh, plcom_fr) & (FR_RXFF | FR_RXFE);
if (data != FR_RXFE)
return 0;
return 1;
}
static void
plcom_enable_debugport(struct plcom_softc *sc)
{
int s;
/* Turn on line break interrupt, set carrier. */
s = splserial();
PLCOM_LOCK(sc);
sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr);
SET(sc->sc_mcr, MCR_DTR | MCR_RTS);
sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit, sc->sc_mcr);
PLCOM_UNLOCK(sc);
splx(s);
}
void
plcom_attach_subr(struct plcom_softc *sc)
{
int unit = sc->sc_iounit;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct tty *tp;
callout_init(&sc->sc_diag_callout);
simple_lock_init(&sc->sc_lock);
/* Disable interrupts before configuring the device. */
sc->sc_cr = 0;
if (plcomconstag && unit == plcomconsunit) {
plcomconsattached = 1;
plcomconstag = iot;
plcomconsioh = ioh;
/* Make sure the console is always "hardwired". */
delay(1000); /* wait for output to finish */
SET(sc->sc_hwflags, PLCOM_HW_CONSOLE);
SET(sc->sc_swflags, TIOCFLAG_SOFTCAR);
/* Must re-enable the console immediately, or we will
hang when trying to print. */
sc->sc_cr = CR_UARTEN;
}
bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr);
/* The PL010 has a 16-byte fifo, but the tx interrupt triggers when
there is space for 8 more bytes. */
sc->sc_fifolen = 8;
printf("\n");
if (ISSET(sc->sc_hwflags, PLCOM_HW_TXFIFO_DISABLE)) {
sc->sc_fifolen = 1;
printf("%s: txfifo disabled\n", sc->sc_dev.dv_xname);
}
if (sc->sc_fifolen > 1)
SET(sc->sc_hwflags, PLCOM_HW_FIFO);
tp = ttymalloc();
tp->t_oproc = plcomstart;
tp->t_param = plcomparam;
tp->t_hwiflow = plcomhwiflow;
sc->sc_tty = tp;
sc->sc_rbuf = malloc(plcom_rbuf_size << 1, M_DEVBUF, M_NOWAIT);
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = plcom_rbuf_size;
if (sc->sc_rbuf == NULL) {
printf("%s: unable to allocate ring buffer\n",
sc->sc_dev.dv_xname);
return;
}
sc->sc_ebuf = sc->sc_rbuf + (plcom_rbuf_size << 1);
tty_attach(tp);
if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE)) {
int maj;
/* locate the major number */
maj = cdevsw_lookup_major(&plcom_cdevsw);
cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit);
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 == plcom_kgdb_iot && unit == plcom_kgdb_unit) {
plcom_kgdb_attached = 1;
SET(sc->sc_hwflags, PLCOM_HW_KGDB);
printf("%s: kgdb\n", sc->sc_dev.dv_xname);
}
#endif
#ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
sc->sc_si = softintr_establish(IPL_SOFTSERIAL, plcomsoft, sc);
#endif
#if NRND > 0 && defined(RND_COM)
rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname,
RND_TYPE_TTY, 0);
#endif
/* if there are no enable/disable functions, assume the device
is always enabled */
if (!sc->enable)
sc->enabled = 1;
plcom_config(sc);
SET(sc->sc_hwflags, PLCOM_HW_DEV_OK);
}
void
plcom_config(struct plcom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* Disable interrupts before configuring the device. */
sc->sc_cr = 0;
bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr);
if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE|PLCOM_HW_KGDB))
plcom_enable_debugport(sc);
}
int
plcom_detach(self, flags)
struct device *self;
int flags;
{
struct plcom_softc *sc = (struct plcom_softc *)self;
int maj, mn;
/* locate the major number */
maj = cdevsw_lookup_major(&plcom_cdevsw);
/* Nuke the vnodes for any open instances. */
mn = self->dv_unit;
vdevgone(maj, mn, mn, VCHR);
mn |= PLCOMDIALOUT_MASK;
vdevgone(maj, mn, mn, VCHR);
/* Free the receive buffer. */
free(sc->sc_rbuf, M_DEVBUF);
/* Detach and free the tty. */
tty_detach(sc->sc_tty);
ttyfree(sc->sc_tty);
#ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
/* Unhook the soft interrupt handler. */
softintr_disestablish(sc->sc_si);
#endif
#if NRND > 0 && defined(RND_COM)
/* Unhook the entropy source. */
rnd_detach_source(&sc->rnd_source);
#endif
return 0;
}
int
plcom_activate(struct device *self, enum devact act)
{
struct plcom_softc *sc = (struct plcom_softc *)self;
int s, rv = 0;
s = splserial();
PLCOM_LOCK(sc);
switch (act) {
case DVACT_ACTIVATE:
rv = EOPNOTSUPP;
break;
case DVACT_DEACTIVATE:
if (sc->sc_hwflags & (PLCOM_HW_CONSOLE|PLCOM_HW_KGDB)) {
rv = EBUSY;
break;
}
if (sc->disable != NULL && sc->enabled != 0) {
(*sc->disable)(sc);
sc->enabled = 0;
}
break;
}
PLCOM_UNLOCK(sc);
splx(s);
return rv;
}
void
plcom_shutdown(struct plcom_softc *sc)
{
struct tty *tp = sc->sc_tty;
int s;
s = splserial();
PLCOM_LOCK(sc);
/* If we were asserting flow control, then deassert it. */
SET(sc->sc_rx_flags, RX_IBUF_BLOCKED);
plcom_hwiflow(sc);
/* Clear any break condition set with TIOCSBRK. */
plcom_break(sc, 0);
/* Turn off PPS capture on last close. */
sc->sc_ppsmask = 0;
sc->ppsparam.mode = 0;
/*
* Hang up if necessary. Wait a bit, so the other side has time to
* notice even if we immediately open the port again.
* Avoid tsleeping above splhigh().
*/
if (ISSET(tp->t_cflag, HUPCL)) {
plcom_modem(sc, 0);
PLCOM_UNLOCK(sc);
splx(s);
/* XXX tsleep will only timeout */
(void) tsleep(sc, TTIPRI, ttclos, hz);
s = splserial();
PLCOM_LOCK(sc);
}
/* Turn off interrupts. */
if (ISSET(sc->sc_hwflags, PLCOM_HW_CONSOLE))
/* interrupt on break */
sc->sc_cr = CR_RIE | CR_RTIE | CR_UARTEN;
else
sc->sc_cr = 0;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr);
if (sc->disable) {
#ifdef DIAGNOSTIC
if (!sc->enabled)
panic("plcom_shutdown: not enabled?");
#endif
(*sc->disable)(sc);
sc->enabled = 0;
}
PLCOM_UNLOCK(sc);
splx(s);
}
int
plcomopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct plcom_softc *sc;
struct tty *tp;
int s, s2;
int error;
sc = device_lookup(&plcom_cd, PLCOMUNIT(dev));
if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK) ||
sc->sc_rbuf == NULL)
return ENXIO;
if (!device_is_active(&sc->sc_dev))
return ENXIO;
#ifdef KGDB
/*
* If this is the kgdb port, no other use is permitted.
*/
if (ISSET(sc->sc_hwflags, PLCOM_HW_KGDB))
return EBUSY;
#endif
tp = sc->sc_tty;
if (ISSET(tp->t_state, TS_ISOPEN) &&
ISSET(tp->t_state, TS_XCLUDE) &&
suser(l->l_proc->p_ucred, &l->l_proc->p_acflag) != 0)
return EBUSY;
s = spltty();
/*
* Do the following iff this is a first open.
*/
if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
struct termios t;
tp->t_dev = dev;
s2 = splserial();
PLCOM_LOCK(sc);
if (sc->enable) {
if ((*sc->enable)(sc)) {
PLCOM_UNLOCK(sc);
splx(s2);
splx(s);
printf("%s: device enable failed\n",
sc->sc_dev.dv_xname);
return EIO;
}
sc->enabled = 1;
plcom_config(sc);
}
/* Turn on interrupts. */
/* IER_ERXRDY | IER_ERLS | IER_EMSC; */
sc->sc_cr = CR_RIE | CR_RTIE | CR_MSIE | CR_UARTEN;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr);
/* Fetch the current modem control status, needed later. */
sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, plcom_fr);
/* Clear PPS capture state on first open. */
sc->sc_ppsmask = 0;
sc->ppsparam.mode = 0;
PLCOM_UNLOCK(sc);
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, PLCOM_HW_CONSOLE)) {
t.c_ospeed = plcomconsrate;
t.c_cflag = plcomconscflag;
} 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);
/* Make sure plcomparam() will do something. */
tp->t_ospeed = 0;
(void) plcomparam(tp, &t);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
ttychars(tp);
ttsetwater(tp);
s2 = splserial();
PLCOM_LOCK(sc);
/*
* 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.
*/
plcom_modem(sc, 1);
/* Clear the input ring, and unblock. */
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = plcom_rbuf_size;
plcom_iflush(sc);
CLR(sc->sc_rx_flags, RX_ANY_BLOCK);
plcom_hwiflow(sc);
#ifdef PLCOM_DEBUG
if (plcom_debug)
plcomstatus(sc, "plcomopen ");
#endif
PLCOM_UNLOCK(sc);
splx(s2);
}
splx(s);
error = ttyopen(tp, PLCOMDIALOUT(dev), ISSET(flag, O_NONBLOCK));
if (error)
goto bad;
error = (*tp->t_linesw->l_open)(dev, tp);
if (error)
goto bad;
return 0;
bad:
if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
/*
* We failed to open the device, and nobody else had it opened.
* Clean up the state as appropriate.
*/
plcom_shutdown(sc);
}
return error;
}
int
plcomclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
/* XXX This is for cons.c. */
if (!ISSET(tp->t_state, TS_ISOPEN))
return 0;
(*tp->t_linesw->l_close)(tp, flag);
ttyclose(tp);
if (PLCOM_ISALIVE(sc) == 0)
return 0;
if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) {
/*
* Although we got a last close, the device may still be in
* use; e.g. if this was the dialout node, and there are still
* processes waiting for carrier on the non-dialout node.
*/
plcom_shutdown(sc);
}
return 0;
}
int
plcomread(dev_t dev, struct uio *uio, int flag)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (PLCOM_ISALIVE(sc) == 0)
return EIO;
return (*tp->t_linesw->l_read)(tp, uio, flag);
}
int
plcomwrite(dev_t dev, struct uio *uio, int flag)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (PLCOM_ISALIVE(sc) == 0)
return EIO;
return (*tp->t_linesw->l_write)(tp, uio, flag);
}
int
plcompoll(dev_t dev, int events, struct lwp *l)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (PLCOM_ISALIVE(sc) == 0)
return EIO;
return (*tp->t_linesw->l_poll)(tp, events, l);
}
struct tty *
plcomtty(dev_t dev)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
return tp;
}
int
plcomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
int error;
int s;
if (PLCOM_ISALIVE(sc) == 0)
return EIO;
error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
if (error != EPASSTHROUGH)
return error;
error = ttioctl(tp, cmd, data, flag, l);
if (error != EPASSTHROUGH)
return error;
error = 0;
s = splserial();
PLCOM_LOCK(sc);
switch (cmd) {
case TIOCSBRK:
plcom_break(sc, 1);
break;
case TIOCCBRK:
plcom_break(sc, 0);
break;
case TIOCSDTR:
plcom_modem(sc, 1);
break;
case TIOCCDTR:
plcom_modem(sc, 0);
break;
case TIOCGFLAGS:
*(int *)data = sc->sc_swflags;
break;
case TIOCSFLAGS:
error = suser(l->l_proc->p_ucred, &l->l_proc->p_acflag);
if (error)
break;
sc->sc_swflags = *(int *)data;
break;
case TIOCMSET:
case TIOCMBIS:
case TIOCMBIC:
tiocm_to_plcom(sc, cmd, *(int *)data);
break;
case TIOCMGET:
*(int *)data = plcom_to_tiocm(sc);
break;
case PPS_IOC_CREATE:
break;
case PPS_IOC_DESTROY:
break;
case PPS_IOC_GETPARAMS: {
pps_params_t *pp;
pp = (pps_params_t *)data;
*pp = sc->ppsparam;
break;
}
case PPS_IOC_SETPARAMS: {
pps_params_t *pp;
int mode;
pp = (pps_params_t *)data;
if (pp->mode & ~ppscap) {
error = EINVAL;
break;
}
sc->ppsparam = *pp;
/*
* Compute msr masks from user-specified timestamp state.
*/
mode = sc->ppsparam.mode;
#ifdef PPS_SYNC
if (mode & PPS_HARDPPSONASSERT) {
mode |= PPS_CAPTUREASSERT;
/* XXX revoke any previous HARDPPS source */
}
if (mode & PPS_HARDPPSONCLEAR) {
mode |= PPS_CAPTURECLEAR;
/* XXX revoke any previous HARDPPS source */
}
#endif /* PPS_SYNC */
switch (mode & PPS_CAPTUREBOTH) {
case 0:
sc->sc_ppsmask = 0;
break;
case PPS_CAPTUREASSERT:
sc->sc_ppsmask = MSR_DCD;
sc->sc_ppsassert = MSR_DCD;
sc->sc_ppsclear = -1;
break;
case PPS_CAPTURECLEAR:
sc->sc_ppsmask = MSR_DCD;
sc->sc_ppsassert = -1;
sc->sc_ppsclear = 0;
break;
case PPS_CAPTUREBOTH:
sc->sc_ppsmask = MSR_DCD;
sc->sc_ppsassert = MSR_DCD;
sc->sc_ppsclear = 0;
break;
default:
error = EINVAL;
break;
}
break;
}
case PPS_IOC_GETCAP:
*(int*)data = ppscap;
break;
case PPS_IOC_FETCH: {
pps_info_t *pi;
pi = (pps_info_t *)data;
*pi = sc->ppsinfo;
break;
}
case TIOCDCDTIMESTAMP: /* XXX old, overloaded API used by xntpd v3 */
/*
* Some GPS clocks models use the falling rather than
* rising edge as the on-the-second signal.
* The old API has no way to specify PPS polarity.
*/
sc->sc_ppsmask = MSR_DCD;
#ifndef PPS_TRAILING_EDGE
sc->sc_ppsassert = MSR_DCD;
sc->sc_ppsclear = -1;
TIMESPEC_TO_TIMEVAL((struct timeval *)data,
&sc->ppsinfo.assert_timestamp);
#else
sc->sc_ppsassert = -1
sc->sc_ppsclear = 0;
TIMESPEC_TO_TIMEVAL((struct timeval *)data,
&sc->ppsinfo.clear_timestamp);
#endif
break;
default:
error = EPASSTHROUGH;
break;
}
PLCOM_UNLOCK(sc);
splx(s);
#ifdef PLCOM_DEBUG
if (plcom_debug)
plcomstatus(sc, "plcomioctl ");
#endif
return error;
}
integrate void
plcom_schedrx(struct plcom_softc *sc)
{
sc->sc_rx_ready = 1;
/* Wake up the poller. */
#ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
softintr_schedule(sc->sc_si);
#else
#ifndef __NO_SOFT_SERIAL_INTERRUPT
setsoftserial();
#else
if (!plcom_softintr_scheduled) {
plcom_softintr_scheduled = 1;
callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL);
}
#endif
#endif
}
void
plcom_break(struct plcom_softc *sc, int onoff)
{
if (onoff)
SET(sc->sc_lcr, LCR_BRK);
else
CLR(sc->sc_lcr, LCR_BRK);
if (!sc->sc_heldchange) {
if (sc->sc_tx_busy) {
sc->sc_heldtbc = sc->sc_tbc;
sc->sc_tbc = 0;
sc->sc_heldchange = 1;
} else
plcom_loadchannelregs(sc);
}
}
void
plcom_modem(struct plcom_softc *sc, int onoff)
{
if (sc->sc_mcr_dtr == 0)
return;
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
plcom_loadchannelregs(sc);
}
}
void
tiocm_to_plcom(struct plcom_softc *sc, u_long how, int ttybits)
{
u_char plcombits;
plcombits = 0;
if (ISSET(ttybits, TIOCM_DTR))
SET(plcombits, MCR_DTR);
if (ISSET(ttybits, TIOCM_RTS))
SET(plcombits, MCR_RTS);
switch (how) {
case TIOCMBIC:
CLR(sc->sc_mcr, plcombits);
break;
case TIOCMBIS:
SET(sc->sc_mcr, plcombits);
break;
case TIOCMSET:
CLR(sc->sc_mcr, MCR_DTR | MCR_RTS);
SET(sc->sc_mcr, plcombits);
break;
}
if (!sc->sc_heldchange) {
if (sc->sc_tx_busy) {
sc->sc_heldtbc = sc->sc_tbc;
sc->sc_tbc = 0;
sc->sc_heldchange = 1;
} else
plcom_loadchannelregs(sc);
}
}
int
plcom_to_tiocm(struct plcom_softc *sc)
{
u_char plcombits;
int ttybits = 0;
plcombits = sc->sc_mcr;
if (ISSET(plcombits, MCR_DTR))
SET(ttybits, TIOCM_DTR);
if (ISSET(plcombits, MCR_RTS))
SET(ttybits, TIOCM_RTS);
plcombits = sc->sc_msr;
if (ISSET(plcombits, MSR_DCD))
SET(ttybits, TIOCM_CD);
if (ISSET(plcombits, MSR_CTS))
SET(ttybits, TIOCM_CTS);
if (ISSET(plcombits, MSR_DSR))
SET(ttybits, TIOCM_DSR);
if (sc->sc_cr != 0)
SET(ttybits, TIOCM_LE);
return ttybits;
}
static u_char
cflag2lcr(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_PEN);
if (!ISSET(cflag, PARODD))
SET(lcr, LCR_EPS);
}
if (ISSET(cflag, CSTOPB))
SET(lcr, LCR_STP2);
return lcr;
}
int
plcomparam(struct tty *tp, struct termios *t)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev));
int ospeed;
u_char lcr;
int s;
if (PLCOM_ISALIVE(sc) == 0)
return EIO;
ospeed = plcomspeed(t->c_ospeed, sc->sc_frequency);
/* 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, PLCOM_HW_CONSOLE)) {
SET(t->c_cflag, CLOCAL);
CLR(t->c_cflag, HUPCL);
}
/*
* If there were no changes, don't do anything. This avoids dropping
* input and improves performance when all we did was frob things like
* VMIN and VTIME.
*/
if (tp->t_ospeed == t->c_ospeed &&
tp->t_cflag == t->c_cflag)
return 0;
lcr = ISSET(sc->sc_lcr, LCR_BRK) | cflag2lcr(t->c_cflag);
s = splserial();
PLCOM_LOCK(sc);
sc->sc_lcr = lcr;
/*
* PL010 has a fixed-length FIFO trigger point.
*/
if (ISSET(sc->sc_hwflags, PLCOM_HW_FIFO))
sc->sc_fifo = 1;
else
sc->sc_fifo = 0;
if (sc->sc_fifo)
SET(sc->sc_lcr, LCR_FEN);
/*
* 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;
} 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;
} 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;
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;
/* 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
plcom_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);
plcom_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);
plcom_hwiflow(sc);
}
} else {
sc->sc_r_hiwat = plcom_rbuf_hiwat;
sc->sc_r_lowat = plcom_rbuf_lowat;
}
PLCOM_UNLOCK(sc);
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) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD));
#ifdef PLCOM_DEBUG
if (plcom_debug)
plcomstatus(sc, "plcomparam ");
#endif
if (!ISSET(t->c_cflag, CHWFLOW)) {
if (sc->sc_tx_stopped) {
sc->sc_tx_stopped = 0;
plcomstart(tp);
}
}
return 0;
}
void
plcom_iflush(struct plcom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
#ifdef DIAGNOSTIC
int reg;
#endif
int timo;
#ifdef DIAGNOSTIC
reg = 0xffff;
#endif
timo = 50000;
/* flush any pending I/O */
while (! ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)
&& --timo)
#ifdef DIAGNOSTIC
reg =
#else
(void)
#endif
bus_space_read_1(iot, ioh, plcom_dr);
#ifdef DIAGNOSTIC
if (!timo)
printf("%s: plcom_iflush timeout %02x\n", sc->sc_dev.dv_xname,
reg);
#endif
}
void
plcom_loadchannelregs(struct plcom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* XXXXX necessary? */
plcom_iflush(sc);
bus_space_write_1(iot, ioh, plcom_cr, 0);
bus_space_write_1(iot, ioh, plcom_dlbl, sc->sc_dlbl);
bus_space_write_1(iot, ioh, plcom_dlbh, sc->sc_dlbh);
bus_space_write_1(iot, ioh, plcom_lcr, sc->sc_lcr);
sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit,
sc->sc_mcr_active = sc->sc_mcr);
bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr);
}
int
plcomhwiflow(struct tty *tp, int block)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev));
int s;
if (PLCOM_ISALIVE(sc) == 0)
return 0;
if (sc->sc_mcr_rts == 0)
return 0;
s = splserial();
PLCOM_LOCK(sc);
if (block) {
if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
SET(sc->sc_rx_flags, RX_TTY_BLOCKED);
plcom_hwiflow(sc);
}
} else {
if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) {
CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
plcom_schedrx(sc);
}
if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_TTY_BLOCKED);
plcom_hwiflow(sc);
}
}
PLCOM_UNLOCK(sc);
splx(s);
return 1;
}
/*
* (un)block input via hw flowcontrol
*/
void
plcom_hwiflow(struct plcom_softc *sc)
{
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);
}
sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit,
sc->sc_mcr_active);
}
void
plcomstart(struct tty *tp)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev));
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int s;
if (PLCOM_ISALIVE(sc) == 0)
return;
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();
PLCOM_LOCK(sc);
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_cr, CR_TIE)) {
SET(sc->sc_cr, CR_TIE);
bus_space_write_1(iot, ioh, plcom_cr, sc->sc_cr);
}
/* 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, plcom_dr, sc->sc_tba, n);
sc->sc_tbc -= n;
sc->sc_tba += n;
}
PLCOM_UNLOCK(sc);
out:
splx(s);
return;
}
/*
* Stop output on a line.
*/
void
plcomstop(struct tty *tp, int flag)
{
struct plcom_softc *sc = device_lookup(&plcom_cd, PLCOMUNIT(tp->t_dev));
int s;
s = splserial();
PLCOM_LOCK(sc);
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);
}
PLCOM_UNLOCK(sc);
splx(s);
}
void
plcomdiag(void *arg)
{
struct plcom_softc *sc = arg;
int overflows, floods;
int s;
s = splserial();
PLCOM_LOCK(sc);
overflows = sc->sc_overflows;
sc->sc_overflows = 0;
floods = sc->sc_floods;
sc->sc_floods = 0;
sc->sc_errors = 0;
PLCOM_UNLOCK(sc);
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
plcom_rxsoft(struct plcom_softc *sc, struct tty *tp)
{
int (*rint) (int, struct tty *) = tp->t_linesw->l_rint;
u_char *get, *end;
u_int cc, scc;
u_char rsr;
int code;
int s;
end = sc->sc_ebuf;
get = sc->sc_rbget;
scc = cc = plcom_rbuf_size - sc->sc_rbavail;
if (cc == plcom_rbuf_size) {
sc->sc_floods++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_callout, 60 * hz,
plcomdiag, sc);
}
while (cc) {
code = get[0];
rsr = get[1];
if (ISSET(rsr, RSR_OE | RSR_BE | RSR_FE | RSR_PE)) {
if (ISSET(rsr, RSR_OE)) {
sc->sc_overflows++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_callout,
60 * hz, plcomdiag, sc);
}
if (ISSET(rsr, RSR_BE | RSR_FE))
SET(code, TTY_FE);
if (ISSET(rsr, RSR_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 -= plcom_rbuf_size << 1;
cc = 0;
} else {
/*
* Don't schedule any more receive processing
* until the line discipline tells us there's
* space available (through plcomhwiflow()).
* 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();
PLCOM_LOCK(sc);
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_cr, CR_RIE | CR_RTIE);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, plcom_cr, sc->sc_cr);
}
if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED);
plcom_hwiflow(sc);
}
}
PLCOM_UNLOCK(sc);
splx(s);
}
}
integrate void
plcom_txsoft(struct plcom_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));
(*tp->t_linesw->l_start)(tp);
}
integrate void
plcom_stsoft(struct plcom_softc *sc, struct tty *tp)
{
u_char msr, delta;
int s;
s = splserial();
PLCOM_LOCK(sc);
msr = sc->sc_msr;
delta = sc->sc_msr_delta;
sc->sc_msr_delta = 0;
PLCOM_UNLOCK(sc);
splx(s);
if (ISSET(delta, sc->sc_msr_dcd)) {
/*
* Inform the tty layer that carrier detect changed.
*/
(void) (*tp->t_linesw->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;
(*tp->t_linesw->l_start)(tp);
} else {
sc->sc_tx_stopped = 1;
}
}
#ifdef PLCOM_DEBUG
if (plcom_debug)
plcomstatus(sc, "plcom_stsoft");
#endif
}
#ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
void
plcomsoft(void *arg)
{
struct plcom_softc *sc = arg;
struct tty *tp;
if (PLCOM_ISALIVE(sc) == 0)
return;
{
#else
void
#ifndef __NO_SOFT_SERIAL_INTERRUPT
plcomsoft(void)
#else
plcomsoft(void *arg)
#endif
{
struct plcom_softc *sc;
struct tty *tp;
int unit;
#ifdef __NO_SOFT_SERIAL_INTERRUPT
int s;
s = splsoftserial();
plcom_softintr_scheduled = 0;
#endif
for (unit = 0; unit < plcom_cd.cd_ndevs; unit++) {
sc = device_lookup(&plcom_cd, unit);
if (sc == NULL || !ISSET(sc->sc_hwflags, PLCOM_HW_DEV_OK))
continue;
if (PLCOM_ISALIVE(sc) == 0)
continue;
tp = sc->sc_tty;
if (tp == NULL)
continue;
if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0)
continue;
#endif
tp = sc->sc_tty;
if (sc->sc_rx_ready) {
sc->sc_rx_ready = 0;
plcom_rxsoft(sc, tp);
}
if (sc->sc_st_check) {
sc->sc_st_check = 0;
plcom_stsoft(sc, tp);
}
if (sc->sc_tx_done) {
sc->sc_tx_done = 0;
plcom_txsoft(sc, tp);
}
}
#ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
#ifdef __NO_SOFT_SERIAL_INTERRUPT
splx(s);
#endif
#endif
}
#ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS
/* there has got to be a better way to do plcomsoft() */
}}
#endif
int
plcomintr(void *arg)
{
struct plcom_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 rsr, iir;
if (PLCOM_ISALIVE(sc) == 0)
return 0;
PLCOM_LOCK(sc);
iir = bus_space_read_1(iot, ioh, plcom_iir);
if (! ISSET(iir, IIR_IMASK)) {
PLCOM_UNLOCK(sc);
return 0;
}
end = sc->sc_ebuf;
put = sc->sc_rbput;
cc = sc->sc_rbavail;
do {
u_char msr, delta, fr;
fr = bus_space_read_1(iot, ioh, plcom_fr);
if (!ISSET(fr, FR_RXFE) &&
!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
while (cc > 0) {
int cn_trapped = 0;
put[0] = bus_space_read_1(iot, ioh,
plcom_dr);
rsr = bus_space_read_1(iot, ioh, plcom_rsr);
/* Clear any error status. */
if (ISSET(rsr,
(RSR_BE | RSR_OE | RSR_PE | RSR_FE)))
bus_space_write_1(iot, ioh, plcom_ecr,
0);
if (ISSET(rsr, RSR_BE)) {
cn_trapped = 0;
cn_check_magic(sc->sc_tty->t_dev,
CNC_BREAK, plcom_cnm_state);
if (cn_trapped)
continue;
#if defined(KGDB)
if (ISSET(sc->sc_hwflags,
PLCOM_HW_KGDB)) {
kgdb_connect(1);
continue;
}
#endif
}
put[1] = rsr;
cn_trapped = 0;
cn_check_magic(sc->sc_tty->t_dev,
put[0], plcom_cnm_state);
if (cn_trapped) {
fr = bus_space_read_1(iot, ioh,
plcom_fr);
if (ISSET(fr, FR_RXFE))
break;
continue;
}
put += 2;
if (put >= end)
put = sc->sc_rbuf;
cc--;
fr = bus_space_read_1(iot, ioh, plcom_fr);
if (ISSET(fr, FR_RXFE))
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);
plcom_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_cr, CR_RIE | CR_RTIE);
bus_space_write_1(iot, ioh, plcom_cr,
sc->sc_cr);
}
} else {
if (ISSET(iir, IIR_RIS)) {
bus_space_write_1(iot, ioh, plcom_cr, 0);
delay(10);
bus_space_write_1(iot, ioh, plcom_cr,
sc->sc_cr);
continue;
}
}
msr = bus_space_read_1(iot, ioh, plcom_fr);
delta = msr ^ sc->sc_msr;
sc->sc_msr = msr;
/* Clear any pending modem status interrupt. */
if (iir & IIR_MIS)
bus_space_write_1(iot, ioh, plcom_icr, 0);
/*
* Pulse-per-second (PSS) signals on edge of DCD?
* Process these even if line discipline is ignoring DCD.
*/
if (delta & sc->sc_ppsmask) {
struct timeval tv;
if ((msr & sc->sc_ppsmask) == sc->sc_ppsassert) {
/* XXX nanotime() */
microtime(&tv);
TIMEVAL_TO_TIMESPEC(&tv,
&sc->ppsinfo.assert_timestamp);
if (sc->ppsparam.mode & PPS_OFFSETASSERT) {
timespecadd(&sc->ppsinfo.assert_timestamp,
&sc->ppsparam.assert_offset,
&sc->ppsinfo.assert_timestamp);
}
#ifdef PPS_SYNC
if (sc->ppsparam.mode & PPS_HARDPPSONASSERT)
hardpps(&tv, tv.tv_usec);
#endif
sc->ppsinfo.assert_sequence++;
sc->ppsinfo.current_mode = sc->ppsparam.mode;
} else if ((msr & sc->sc_ppsmask) == sc->sc_ppsclear) {
/* XXX nanotime() */
microtime(&tv);
TIMEVAL_TO_TIMESPEC(&tv,
&sc->ppsinfo.clear_timestamp);
if (sc->ppsparam.mode & PPS_OFFSETCLEAR) {
timespecadd(&sc->ppsinfo.clear_timestamp,
&sc->ppsparam.clear_offset,
&sc->ppsinfo.clear_timestamp);
}
#ifdef PPS_SYNC
if (sc->ppsparam.mode & PPS_HARDPPSONCLEAR)
hardpps(&tv, tv.tv_usec);
#endif
sc->ppsinfo.clear_sequence++;
sc->ppsinfo.current_mode = sc->ppsparam.mode;
}
}
/*
* Process normal status changes
*/
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 PLCOM_DEBUG
if (plcom_debug)
plcomstatus(sc, "plcomintr ");
#endif
}
sc->sc_st_check = 1;
}
/*
* 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(iir, IIR_TIS)) {
/*
* If we've delayed a parameter change, do it
* now, and restart * output.
*/
if (sc->sc_heldchange) {
plcom_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, plcom_dr,
sc->sc_tba, n);
sc->sc_tbc -= n;
sc->sc_tba += n;
} else {
/*
* Disable transmit plcompletion
* interrupts if necessary.
*/
if (ISSET(sc->sc_cr, CR_TIE)) {
CLR(sc->sc_cr, CR_TIE);
bus_space_write_1(iot, ioh, plcom_cr,
sc->sc_cr);
}
if (sc->sc_tx_busy) {
sc->sc_tx_busy = 0;
sc->sc_tx_done = 1;
}
}
}
} while (ISSET((iir = bus_space_read_1(iot, ioh, plcom_iir)),
IIR_IMASK));
PLCOM_UNLOCK(sc);
/* Wake up the poller. */
#ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
softintr_schedule(sc->sc_si);
#else
#ifndef __NO_SOFT_SERIAL_INTERRUPT
setsoftserial();
#else
if (!plcom_softintr_scheduled) {
plcom_softintr_scheduled = 1;
callout_reset(&plcomsoft_callout, 1, plcomsoft, NULL);
}
#endif
#endif
#if NRND > 0 && defined(RND_COM)
rnd_add_uint32(&sc->rnd_source, iir | rsr);
#endif
return 1;
}
/*
* The following functions are polled getc and putc routines, shared
* by the console and kgdb glue.
*
* The read-ahead code is so that you can detect pending in-band
* cn_magic in polled mode while doing output rather than having to
* wait until the kernel decides it needs input.
*/
#define MAX_READAHEAD 20
static int plcom_readahead[MAX_READAHEAD];
static int plcom_readaheadcount = 0;
int
plcom_common_getc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh)
{
int s = splserial();
u_char stat, c;
/* got a character from reading things earlier */
if (plcom_readaheadcount > 0) {
int i;
c = plcom_readahead[0];
for (i = 1; i < plcom_readaheadcount; i++) {
plcom_readahead[i-1] = plcom_readahead[i];
}
plcom_readaheadcount--;
splx(s);
return c;
}
/* block until a character becomes available */
while (ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE))
;
c = bus_space_read_1(iot, ioh, plcom_dr);
stat = bus_space_read_1(iot, ioh, plcom_iir);
{
int cn_trapped = 0; /* unused */
#ifdef DDB
extern int db_active;
if (!db_active)
#endif
cn_check_magic(dev, c, plcom_cnm_state);
}
splx(s);
return c;
}
void
plcom_common_putc(dev_t dev, bus_space_tag_t iot, bus_space_handle_t ioh,
int c)
{
int s = splserial();
int timo;
int cin, stat;
if (plcom_readaheadcount < MAX_READAHEAD
&& !ISSET(stat = bus_space_read_1(iot, ioh, plcom_fr), FR_RXFE)) {
int cn_trapped = 0;
cin = bus_space_read_1(iot, ioh, plcom_dr);
stat = bus_space_read_1(iot, ioh, plcom_iir);
cn_check_magic(dev, cin, plcom_cnm_state);
plcom_readahead[plcom_readaheadcount++] = cin;
}
/* wait for any pending transmission to finish */
timo = 150000;
while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo)
continue;
bus_space_write_1(iot, ioh, plcom_dr, c);
PLCOM_BARRIER(iot, ioh, BR | BW);
/* wait for this transmission to complete */
timo = 1500000;
while (!ISSET(bus_space_read_1(iot, ioh, plcom_fr), FR_TXFE) && --timo)
continue;
splx(s);
}
/*
* Initialize UART for use as console or KGDB line.
*/
int
plcominit(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency,
tcflag_t cflag, bus_space_handle_t *iohp)
{
bus_space_handle_t ioh;
if (bus_space_map(iot, iobase, PLCOM_UART_SIZE, 0, &ioh))
return ENOMEM; /* ??? */
rate = plcomspeed(rate, frequency);
bus_space_write_1(iot, ioh, plcom_cr, 0);
bus_space_write_1(iot, ioh, plcom_dlbl, rate);
bus_space_write_1(iot, ioh, plcom_dlbh, rate >> 8);
bus_space_write_1(iot, ioh, plcom_lcr, cflag2lcr(cflag) | LCR_FEN);
bus_space_write_1(iot, ioh, plcom_cr, CR_UARTEN);
#if 0
/* Ought to do something like this, but we have no sc to
dereference. */
sc->sc_set_mcr(sc->sc_set_mcr_arg, sc->sc_dev.dv_unit,
MCR_DTR | MCR_RTS);
#endif
*iohp = ioh;
return 0;
}
/*
* Following are all routines needed for PLCOM to act as console
*/
struct consdev plcomcons = {
NULL, NULL, plcomcngetc, plcomcnputc, plcomcnpollc, NULL,
NULL, NULL, NODEV, CN_NORMAL
};
int
plcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, int rate, int frequency,
tcflag_t cflag, int unit)
{
int res;
res = plcominit(iot, iobase, rate, frequency, cflag, &plcomconsioh);
if (res)
return res;
cn_tab = &plcomcons;
cn_init_magic(&plcom_cnm_state);
cn_set_magic("\047\001"); /* default magic is BREAK */
plcomconstag = iot;
plcomconsunit = unit;
plcomconsrate = rate;
plcomconscflag = cflag;
return 0;
}
void
plcomcndetach(void)
{
bus_space_unmap(plcomconstag, plcomconsioh, PLCOM_UART_SIZE);
plcomconstag = NULL;
cn_tab = NULL;
}
int
plcomcngetc(dev_t dev)
{
return plcom_common_getc(dev, plcomconstag, plcomconsioh);
}
/*
* Console kernel output character routine.
*/
void
plcomcnputc(dev_t dev, int c)
{
plcom_common_putc(dev, plcomconstag, plcomconsioh, c);
}
void
plcomcnpollc(dev_t dev, int on)
{
}
#ifdef KGDB
int
plcom_kgdb_attach(bus_space_tag_t iot, bus_addr_t iobase, int rate,
int frequency, tcflag_t cflag, int unit)
{
int res;
if (iot == plcomconstag && iobase == plcomconsunit)
return EBUSY; /* cannot share with console */
res = plcominit(iot, iobase, rate, frequency, cflag, &plcom_kgdb_ioh);
if (res)
return res;
kgdb_attach(plcom_kgdb_getc, plcom_kgdb_putc, NULL);
kgdb_dev = 123; /* unneeded, only to satisfy some tests */
plcom_kgdb_iot = iot;
plcom_kgdb_unit = unit;
return 0;
}
/* ARGSUSED */
int
plcom_kgdb_getc(void *arg)
{
return plcom_common_getc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh);
}
/* ARGSUSED */
void
plcom_kgdb_putc(void *arg, int c)
{
plcom_common_putc(NODEV, plcom_kgdb_iot, plcom_kgdb_ioh, c);
}
#endif /* KGDB */
/* helper function to identify the plcom ports used by
console or KGDB (and not yet autoconf attached) */
int
plcom_is_console(bus_space_tag_t iot, int unit,
bus_space_handle_t *ioh)
{
bus_space_handle_t help;
if (!plcomconsattached &&
iot == plcomconstag && unit == plcomconsunit)
help = plcomconsioh;
#ifdef KGDB
else if (!plcom_kgdb_attached &&
iot == plcom_kgdb_iot && unit == plcom_kgdb_unit)
help = plcom_kgdb_ioh;
#endif
else
return 0;
if (ioh)
*ioh = help;
return 1;
}
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