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NetBSD/sys/arch/arm/s3c2xx0/sscom.c

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/* $NetBSD: sscom.c,v 1.50 2022/10/26 23:38:06 riastradh Exp $ */
/*
* Copyright (c) 2002, 2003 Fujitsu Component Limited
* Copyright (c) 2002, 2003 Genetec Corporation
* 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 Fujitsu Component Limited nor the name of
* Genetec corporation may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC
* CORPORATION ``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 FUJITSU COMPONENT LIMITED OR GENETEC
* CORPORATION 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.
*
* 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
*/
/*
* Support integrated UARTs of Samsung S3C2800/2400X/2410X
* Derived from sys/dev/ic/com.c
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sscom.c,v 1.50 2022/10/26 23:38:06 riastradh Exp $");
#include "opt_sscom.h"
#include "opt_kgdb.h"
#include "opt_multiprocessor.h"
#include "opt_lockdebug.h"
#ifdef RND_COM
#include <sys/rndsource.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/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/kmem.h>
#include <sys/timepps.h>
#include <sys/vnode.h>
#include <sys/kauth.h>
#include <sys/intr.h>
#include <sys/bus.h>
#include <sys/mutex.h>
#include <ddb/db_active.h>
#include <arm/s3c2xx0/s3c2xx0reg.h>
#include <arm/s3c2xx0/sscom_var.h>
#include <dev/cons.h>
dev_type_open(sscomopen);
dev_type_close(sscomclose);
dev_type_read(sscomread);
dev_type_write(sscomwrite);
dev_type_ioctl(sscomioctl);
dev_type_stop(sscomstop);
dev_type_tty(sscomtty);
dev_type_poll(sscompoll);
int sscomcngetc (dev_t);
void sscomcnputc (dev_t, int);
void sscomcnpollc (dev_t, int);
#define integrate static inline
void sscomsoft (void *);
integrate void sscom_rxsoft (struct sscom_softc *, struct tty *);
integrate void sscom_txsoft (struct sscom_softc *, struct tty *);
integrate void sscom_stsoft (struct sscom_softc *, struct tty *);
integrate void sscom_schedrx (struct sscom_softc *);
static void sscom_modem(struct sscom_softc *, int);
static void sscom_break(struct sscom_softc *, int);
static void sscom_iflush(struct sscom_softc *);
static void sscom_hwiflow(struct sscom_softc *);
static void sscom_loadchannelregs(struct sscom_softc *);
static void tiocm_to_sscom(struct sscom_softc *, u_long, int);
static int sscom_to_tiocm(struct sscom_softc *);
static void tiocm_to_sscom(struct sscom_softc *, u_long, int);
static int sscom_to_tiocm(struct sscom_softc *);
static void sscom_iflush(struct sscom_softc *);
static int sscomhwiflow(struct tty *tp, int block);
#if defined(KGDB) || defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE)
static int sscom_init(bus_space_tag_t, const struct sscom_uart_info *,
int, int, tcflag_t, bus_space_handle_t *);
#endif
extern struct cfdriver sscom_cd;
const struct cdevsw sscom_cdevsw = {
.d_open = sscomopen,
.d_close = sscomclose,
.d_read = sscomread,
.d_write = sscomwrite,
.d_ioctl = sscomioctl,
.d_stop = sscomstop,
.d_tty = sscomtty,
.d_poll = sscompoll,
.d_mmap = nommap,
.d_kqfilter = ttykqfilter,
.d_discard = nodiscard,
.d_flag = D_TTY
};
/*
* Make this an option variable one can patch.
* But be warned: this must be a power of 2!
*/
u_int sscom_rbuf_size = SSCOM_RING_SIZE;
/* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */
u_int sscom_rbuf_hiwat = (SSCOM_RING_SIZE * 1) / 4;
u_int sscom_rbuf_lowat = (SSCOM_RING_SIZE * 3) / 4;
static int sscomconsunit = -1;
static bus_space_tag_t sscomconstag;
static bus_space_handle_t sscomconsioh;
static int sscomconsattached;
static int sscomconsrate;
static tcflag_t sscomconscflag;
static struct cnm_state sscom_cnm_state;
#ifdef KGDB
#include <sys/kgdb.h>
static int sscom_kgdb_unit = -1;
static bus_space_tag_t sscom_kgdb_iot;
static bus_space_handle_t sscom_kgdb_ioh;
static int sscom_kgdb_attached;
int sscom_kgdb_getc (void *);
void sscom_kgdb_putc (void *, int);
#endif /* KGDB */
#define SSCOMUNIT_MASK 0x7f
#define SSCOMDIALOUT_MASK 0x80
#define SSCOMUNIT(x) (minor(x) & SSCOMUNIT_MASK)
#define SSCOMDIALOUT(x) (minor(x) & SSCOMDIALOUT_MASK)
#if 0
#define SSCOM_ISALIVE(sc) ((sc)->enabled != 0 && \
device_is_active(&(sc)->sc_dev))
#else
#define SSCOM_ISALIVE(sc) device_is_active((sc)->sc_dev)
#endif
#define BR BUS_SPACE_BARRIER_READ
#define BW BUS_SPACE_BARRIER_WRITE
#define SSCOM_BARRIER(t, h, f) /* no-op */
#if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK)
#define SSCOM_LOCK(sc) mutex_enter((sc)->sc_lock)
#define SSCOM_UNLOCK(sc) mutex_exit((sc)->sc_lock)
#else
#define SSCOM_LOCK(sc)
#define SSCOM_UNLOCK(sc)
#endif
#ifndef SSCOM_TOLERANCE
#define SSCOM_TOLERANCE 30 /* XXX: baud rate tolerance, in 0.1% units */
#endif
/* value for UCON */
#define UCON_RXINT_MASK \
(UCON_RXMODE_MASK|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE)
#define UCON_RXINT_ENABLE \
(UCON_RXMODE_INT|UCON_ERRINT|UCON_TOINT|UCON_RXINT_TYPE_LEVEL)
#define UCON_TXINT_MASK (UCON_TXMODE_MASK|UCON_TXINT_TYPE)
#define UCON_TXINT_ENABLE (UCON_TXMODE_INT|UCON_TXINT_TYPE_LEVEL)
/* we don't want tx interrupt on debug port, but it is needed to
have transmitter active */
#define UCON_DEBUGPORT (UCON_RXINT_ENABLE|UCON_TXINT_ENABLE)
static inline void
__sscom_output_chunk(struct sscom_softc *sc, int ufstat)
{
int n, space;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
n = sc->sc_tbc;
space = 16 - ((ufstat & UFSTAT_TXCOUNT) >> UFSTAT_TXCOUNT_SHIFT);
if (n > space)
n = space;
if (n > 0) {
bus_space_write_multi_1(iot, ioh, SSCOM_UTXH, sc->sc_tba, n);
sc->sc_tbc -= n;
sc->sc_tba += n;
}
}
static void
sscom_output_chunk(struct sscom_softc *sc)
{
int ufstat = bus_space_read_2(sc->sc_iot, sc->sc_ioh, SSCOM_UFSTAT);
if (!(ufstat & UFSTAT_TXFULL))
__sscom_output_chunk(sc, ufstat);
}
int
sscomspeed(long speed, long frequency)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
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 > SSCOM_TOLERANCE)
return -1;
return x-1;
#undef divrnd
}
void sscomstatus (struct sscom_softc *, const char *);
#ifdef SSCOM_DEBUG
int sscom_debug = 0;
void
sscomstatus(struct sscom_softc *sc, const char *str)
{
struct tty *tp = sc->sc_tty;
int umstat = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMSTAT);
int umcon = bus_space_read_1(sc->sc_iot, sc->sc_iot, SSCOM_UMCON);
printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n",
device_xname(sc->sc_dev), str,
ISSET(tp->t_cflag, CLOCAL) ? "+" : "-",
"+", /* DCD */
ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-",
"+", /* DTR */
sc->sc_tx_stopped ? "+" : "-");
printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n",
device_xname(sc->sc_dev), str,
ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-",
ISSET(umstat, UMSTAT_CTS) ? "+" : "-",
ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-",
ISSET(umcon, UMCON_RTS) ? "+" : "-",
sc->sc_rx_flags);
}
#else
#define sscom_debug 0
#endif
static void
sscom_enable_debugport(struct sscom_softc *sc)
{
int s;
/* Turn on line break interrupt, set carrier. */
s = splserial();
SSCOM_LOCK(sc);
sc->sc_ucon = UCON_DEBUGPORT;
bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon);
sc->sc_umcon = UMCON_RTS|UMCON_DTR;
sc->sc_set_modem_control(sc);
sscom_enable_rxint(sc);
sscom_disable_txint(sc);
SSCOM_UNLOCK(sc);
splx(s);
}
static void
sscom_set_modem_control(struct sscom_softc *sc)
{
/* flob RTS */
bus_space_write_1(sc->sc_iot, sc->sc_ioh,
SSCOM_UMCON, sc->sc_umcon & UMCON_HW_MASK);
/* ignore DTR */
}
static int
sscom_read_modem_status(struct sscom_softc *sc)
{
int msts;
msts = bus_space_read_1(sc->sc_iot, sc->sc_ioh, SSCOM_UMSTAT);
/* DCD and DSR are always on */
return (msts & UMSTAT_CTS) | MSTS_DCD | MSTS_DSR;
}
void
sscom_attach_subr(struct sscom_softc *sc)
{
int unit = sc->sc_unit;
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, 0);
#if (defined(MULTIPROCESSOR) || defined(LOCKDEBUG)) && defined(SSCOM_MPLOCK)
sc->sc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SERIAL);
#endif
sc->sc_ucon = UCON_RXINT_ENABLE|UCON_TXINT_ENABLE;
/*
* set default for modem control hook
*/
if (sc->sc_set_modem_control == NULL)
sc->sc_set_modem_control = sscom_set_modem_control;
if (sc->sc_read_modem_status == NULL)
sc->sc_read_modem_status = sscom_read_modem_status;
/* Disable interrupts before configuring the device. */
KASSERT(sc->sc_change_txrx_interrupts != NULL);
sscom_disable_txrxint(sc);
#ifdef KGDB
/*
* Allow kgdb to "take over" this port. If this is
* the kgdb device, it has exclusive use.
*/
if (unit == sscom_kgdb_unit) {
SET(sc->sc_hwflags, SSCOM_HW_KGDB);
sc->sc_ucon = UCON_DEBUGPORT;
}
#endif
if (unit == sscomconsunit) {
int timo, stat;
sscomconsattached = 1;
sscomconstag = iot;
sscomconsioh = ioh;
/* wait for this transmission to complete */
timo = 1500000;
do {
stat = bus_space_read_1(iot, ioh, SSCOM_UTRSTAT);
} while ((stat & UTRSTAT_TXEMPTY) == 0 && --timo > 0);
/* Make sure the console is always "hardwired". */
SET(sc->sc_hwflags, SSCOM_HW_CONSOLE);
SET(sc->sc_swflags, TIOCFLAG_SOFTCAR);
sc->sc_ucon = UCON_DEBUGPORT;
}
bus_space_write_1(iot, ioh, SSCOM_UFCON,
#ifdef SSCOM_S3C2440
UFCON_TXTRIGGER_16|UFCON_RXTRIGGER_16|UFCON_FIFO_ENABLE|
#else
UFCON_TXTRIGGER_8|UFCON_RXTRIGGER_8|UFCON_FIFO_ENABLE|
#endif
UFCON_TXFIFO_RESET|UFCON_RXFIFO_RESET);
bus_space_write_1(iot, ioh, SSCOM_UCON, sc->sc_ucon);
#ifdef KGDB
if (ISSET(sc->sc_hwflags, SSCOM_HW_KGDB)) {
sscom_kgdb_attached = 1;
printf("%s: kgdb\n", device_xname(sc->sc_dev));
sscom_enable_debugport(sc);
return;
}
#endif
tp = tty_alloc();
tp->t_oproc = sscomstart;
tp->t_param = sscomparam;
tp->t_hwiflow = sscomhwiflow;
sc->sc_tty = tp;
sc->sc_rbuf = kmem_alloc(sscom_rbuf_size << 1, KM_SLEEP);
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = sscom_rbuf_size;
sc->sc_ebuf = sc->sc_rbuf + (sscom_rbuf_size << 1);
tty_attach(tp);
if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE)) {
int maj;
/* locate the major number */
maj = cdevsw_lookup_major(&sscom_cdevsw);
cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev));
printf("%s: console (major=%d)\n", device_xname(sc->sc_dev), maj);
}
sc->sc_si = softint_establish(SOFTINT_SERIAL, sscomsoft, sc);
#ifdef RND_COM
rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
RND_TYPE_TTY, RND_FLAG_COLLECT_TIME|
RND_FLAG_ESTIMATE_TIME);
#endif
/* if there are no enable/disable functions, assume the device
is always enabled */
if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE))
sscom_enable_debugport(sc);
else
sscom_disable_txrxint(sc);
SET(sc->sc_hwflags, SSCOM_HW_DEV_OK);
}
int
sscom_detach(device_t self, int flags)
{
struct sscom_softc *sc = device_private(self);
if (sc->sc_hwflags & (SSCOM_HW_CONSOLE|SSCOM_HW_KGDB))
return EBUSY;
return 0;
}
int
sscom_activate(device_t self, enum devact act)
{
#ifdef notyet
struct sscom_softc *sc = device_private(self);
#endif
switch (act) {
case DVACT_DEACTIVATE:
#ifdef notyet
sc->enabled = 0;
#endif
return 0;
default:
return EOPNOTSUPP;
}
}
void
sscom_shutdown(struct sscom_softc *sc)
{
#ifdef notyet
struct tty *tp = sc->sc_tty;
int s;
s = splserial();
SSCOM_LOCK(sc);
/* If we were asserting flow control, then deassert it. */
SET(sc->sc_rx_flags, RX_IBUF_BLOCKED);
sscom_hwiflow(sc);
/* Clear any break condition set with TIOCSBRK. */
sscom_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.
* Avoid tsleeping above splhigh().
*/
if (ISSET(tp->t_cflag, HUPCL)) {
sscom_modem(sc, 0);
SSCOM_UNLOCK(sc);
splx(s);
/* XXX tsleep will only timeout */
(void) tsleep(sc, TTIPRI, ttclos, hz);
s = splserial();
SSCOM_LOCK(sc);
}
if (ISSET(sc->sc_hwflags, SSCOM_HW_CONSOLE))
/* interrupt on break */
sc->sc_ucon = UCON_DEBUGPORT;
else
sc->sc_ucon = 0;
bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON, sc->sc_ucon);
#ifdef DIAGNOSTIC
if (!sc->enabled)
panic("sscom_shutdown: not enabled?");
#endif
sc->enabled = 0;
SSCOM_UNLOCK(sc);
splx(s);
#endif
}
int
sscomopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct sscom_softc *sc;
struct tty *tp;
int s, s2;
int error;
sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev));
if (sc == NULL || !ISSET(sc->sc_hwflags, SSCOM_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, SSCOM_HW_KGDB))
return EBUSY;
#endif
tp = sc->sc_tty;
if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
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();
SSCOM_LOCK(sc);
/* Turn on interrupts. */
sscom_enable_txrxint(sc);
/* Fetch the current modem control status, needed later. */
sc->sc_msts = sc->sc_read_modem_status(sc);
#if 0
/* Clear PPS capture state on first open. */
sc->sc_ppsmask = 0;
sc->ppsparam.mode = 0;
#endif
SSCOM_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, SSCOM_HW_CONSOLE)) {
t.c_ospeed = sscomconsrate;
t.c_cflag = sscomconscflag;
} 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 sscomparam() will do something. */
tp->t_ospeed = 0;
(void) sscomparam(tp, &t);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
ttychars(tp);
ttsetwater(tp);
s2 = splserial();
SSCOM_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.
*/
sscom_modem(sc, 1);
/* Clear the input ring, and unblock. */
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = sscom_rbuf_size;
sscom_iflush(sc);
CLR(sc->sc_rx_flags, RX_ANY_BLOCK);
sscom_hwiflow(sc);
if (sscom_debug)
sscomstatus(sc, "sscomopen ");
SSCOM_UNLOCK(sc);
splx(s2);
}
splx(s);
error = ttyopen(tp, SSCOMDIALOUT(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.
*/
sscom_shutdown(sc);
}
return error;
}
int
sscomclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(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 (SSCOM_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.
*/
sscom_shutdown(sc);
}
return 0;
}
int
sscomread(dev_t dev, struct uio *uio, int flag)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (SSCOM_ISALIVE(sc) == 0)
return EIO;
return (*tp->t_linesw->l_read)(tp, uio, flag);
}
int
sscomwrite(dev_t dev, struct uio *uio, int flag)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (SSCOM_ISALIVE(sc) == 0)
return EIO;
return (*tp->t_linesw->l_write)(tp, uio, flag);
}
int
sscompoll(dev_t dev, int events, struct lwp *l)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (SSCOM_ISALIVE(sc) == 0)
return EIO;
return (*tp->t_linesw->l_poll)(tp, events, l);
}
struct tty *
sscomtty(dev_t dev)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
return tp;
}
int
sscomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(dev));
struct tty *tp = sc->sc_tty;
int error;
int s;
if (SSCOM_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();
SSCOM_LOCK(sc);
switch (cmd) {
case TIOCSBRK:
sscom_break(sc, 1);
break;
case TIOCCBRK:
sscom_break(sc, 0);
break;
case TIOCSDTR:
sscom_modem(sc, 1);
break;
case TIOCCDTR:
sscom_modem(sc, 0);
break;
case TIOCGFLAGS:
*(int *)data = sc->sc_swflags;
break;
case TIOCSFLAGS:
error = kauth_authorize_device_tty(l->l_cred,
KAUTH_DEVICE_TTY_PRIVSET, tp);
if (error)
break;
sc->sc_swflags = *(int *)data;
break;
case TIOCMSET:
case TIOCMBIS:
case TIOCMBIC:
tiocm_to_sscom(sc, cmd, *(int *)data);
break;
case TIOCMGET:
*(int *)data = sscom_to_tiocm(sc);
break;
default:
error = EPASSTHROUGH;
break;
}
SSCOM_UNLOCK(sc);
splx(s);
if (sscom_debug)
sscomstatus(sc, "sscomioctl ");
return error;
}
integrate void
sscom_schedrx(struct sscom_softc *sc)
{
sc->sc_rx_ready = 1;
/* Wake up the poller. */
softint_schedule(sc->sc_si);
}
static void
sscom_break(struct sscom_softc *sc, int onoff)
{
if (onoff)
SET(sc->sc_ucon, UCON_SBREAK);
else
CLR(sc->sc_ucon, UCON_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
sscom_loadchannelregs(sc);
}
}
static void
sscom_modem(struct sscom_softc *sc, int onoff)
{
if (onoff)
SET(sc->sc_umcon, UMCON_DTR);
else
CLR(sc->sc_umcon, UMCON_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
sscom_loadchannelregs(sc);
}
}
static void
tiocm_to_sscom(struct sscom_softc *sc, u_long how, int ttybits)
{
u_char sscombits;
sscombits = 0;
if (ISSET(ttybits, TIOCM_DTR))
sscombits = UMCON_DTR;
if (ISSET(ttybits, TIOCM_RTS))
SET(sscombits, UMCON_RTS);
switch (how) {
case TIOCMBIC:
CLR(sc->sc_umcon, sscombits);
break;
case TIOCMBIS:
SET(sc->sc_umcon, sscombits);
break;
case TIOCMSET:
CLR(sc->sc_umcon, UMCON_DTR);
SET(sc->sc_umcon, sscombits);
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
sscom_loadchannelregs(sc);
}
}
static int
sscom_to_tiocm(struct sscom_softc *sc)
{
u_char sscombits;
int ttybits = 0;
sscombits = sc->sc_umcon;
#if 0
if (ISSET(sscombits, MCR_DTR))
SET(ttybits, TIOCM_DTR);
#endif
if (ISSET(sscombits, UMCON_RTS))
SET(ttybits, TIOCM_RTS);
sscombits = sc->sc_msts;
if (ISSET(sscombits, MSTS_DCD))
SET(ttybits, TIOCM_CD);
if (ISSET(sscombits, MSTS_DSR))
SET(ttybits, TIOCM_DSR);
if (ISSET(sscombits, MSTS_CTS))
SET(ttybits, TIOCM_CTS);
if (sc->sc_ucon != 0)
SET(ttybits, TIOCM_LE);
return ttybits;
}
static int
cflag2lcr(tcflag_t cflag)
{
u_char lcr = ULCON_PARITY_NONE;
switch (cflag & (PARENB|PARODD)) {
case PARENB|PARODD: lcr = ULCON_PARITY_ODD; break;
case PARENB: lcr = ULCON_PARITY_EVEN;
}
switch (ISSET(cflag, CSIZE)) {
case CS5:
SET(lcr, ULCON_LENGTH_5);
break;
case CS6:
SET(lcr, ULCON_LENGTH_6);
break;
case CS7:
SET(lcr, ULCON_LENGTH_7);
break;
case CS8:
SET(lcr, ULCON_LENGTH_8);
break;
}
if (ISSET(cflag, CSTOPB))
SET(lcr, ULCON_STOP);
return lcr;
}
int
sscomparam(struct tty *tp, struct termios *t)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev));
int ospeed;
u_char lcr;
int s;
if (SSCOM_ISALIVE(sc) == 0)
return EIO;
ospeed = sscomspeed(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, SSCOM_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 = cflag2lcr(t->c_cflag);
s = splserial();
SSCOM_LOCK(sc);
sc->sc_ulcon = 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 = MSTS_DCD;
/*
* Set the flow control pins depending on the current flow control
* mode.
*/
if (ISSET(t->c_cflag, CRTSCTS)) {
sc->sc_mcr_dtr = UMCON_DTR;
sc->sc_mcr_rts = UMCON_RTS;
sc->sc_msr_cts = MSTS_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 = UMCON_DTR;
sc->sc_msr_cts = MSTS_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 = UMCON_DTR | UMCON_RTS;
sc->sc_mcr_rts = 0;
sc->sc_msr_cts = 0;
if (ISSET(sc->sc_umcon, UMCON_DTR))
SET(sc->sc_umcon, UMCON_RTS);
else
CLR(sc->sc_umcon, UMCON_RTS);
}
sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd;
if (ospeed == 0)
CLR(sc->sc_umcon, sc->sc_mcr_dtr);
else
SET(sc->sc_umcon, sc->sc_mcr_dtr);
sc->sc_ubrdiv = ospeed;
/* 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
sscom_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);
sscom_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);
sscom_hwiflow(sc);
}
} else {
sc->sc_r_hiwat = sscom_rbuf_hiwat;
sc->sc_r_lowat = sscom_rbuf_lowat;
}
SSCOM_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_msts, MSTS_DCD));
if (sscom_debug)
sscomstatus(sc, "sscomparam ");
if (!ISSET(t->c_cflag, CHWFLOW)) {
if (sc->sc_tx_stopped) {
sc->sc_tx_stopped = 0;
sscomstart(tp);
}
}
return 0;
}
static void
sscom_iflush(struct sscom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int timo;
timo = 50000;
/* flush any pending I/O */
while ( sscom_rxrdy(iot, ioh) && --timo)
(void)sscom_getc(iot,ioh);
#ifdef DIAGNOSTIC
if (!timo)
printf("%s: sscom_iflush timeout\n", device_xname(sc->sc_dev));
#endif
}
static void
sscom_loadchannelregs(struct sscom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* XXXXX necessary? */
sscom_iflush(sc);
bus_space_write_2(iot, ioh, SSCOM_UCON, 0);
#if 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);
}
#endif
bus_space_write_2(iot, ioh, SSCOM_UBRDIV, sc->sc_ubrdiv);
bus_space_write_1(iot, ioh, SSCOM_ULCON, sc->sc_ulcon);
sc->sc_set_modem_control(sc);
bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon);
}
static int
sscomhwiflow(struct tty *tp, int block)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev));
int s;
if (SSCOM_ISALIVE(sc) == 0)
return 0;
if (sc->sc_mcr_rts == 0)
return 0;
s = splserial();
SSCOM_LOCK(sc);
if (block) {
if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
SET(sc->sc_rx_flags, RX_TTY_BLOCKED);
sscom_hwiflow(sc);
}
} else {
if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) {
CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
sscom_schedrx(sc);
}
if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_TTY_BLOCKED);
sscom_hwiflow(sc);
}
}
SSCOM_UNLOCK(sc);
splx(s);
return 1;
}
/*
* (un)block input via hw flowcontrol
*/
static void
sscom_hwiflow(struct sscom_softc *sc)
{
if (sc->sc_mcr_rts == 0)
return;
if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) {
CLR(sc->sc_umcon, sc->sc_mcr_rts);
CLR(sc->sc_mcr_active, sc->sc_mcr_rts);
} else {
SET(sc->sc_umcon, sc->sc_mcr_rts);
SET(sc->sc_mcr_active, sc->sc_mcr_rts);
}
sc->sc_set_modem_control(sc);
}
void
sscomstart(struct tty *tp)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev));
int s;
if (SSCOM_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 (!ttypull(tp))
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();
SSCOM_LOCK(sc);
sc->sc_tba = tba;
sc->sc_tbc = tbc;
}
SET(tp->t_state, TS_BUSY);
sc->sc_tx_busy = 1;
/* Output the first chunk of the contiguous buffer. */
sscom_output_chunk(sc);
/* Enable transmit completion interrupts if necessary. */
if ((sc->sc_hwflags & SSCOM_HW_TXINT) == 0)
sscom_enable_txint(sc);
SSCOM_UNLOCK(sc);
out:
splx(s);
return;
}
/*
* Stop output on a line.
*/
void
sscomstop(struct tty *tp, int flag)
{
struct sscom_softc *sc = device_lookup_private(&sscom_cd, SSCOMUNIT(tp->t_dev));
int s;
s = splserial();
SSCOM_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);
}
SSCOM_UNLOCK(sc);
splx(s);
}
void
sscomdiag(void *arg)
{
struct sscom_softc *sc = arg;
int overflows, floods;
int s;
s = splserial();
SSCOM_LOCK(sc);
overflows = sc->sc_overflows;
sc->sc_overflows = 0;
floods = sc->sc_floods;
sc->sc_floods = 0;
sc->sc_errors = 0;
SSCOM_UNLOCK(sc);
splx(s);
log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n",
device_xname(sc->sc_dev),
overflows, overflows == 1 ? "" : "s",
floods, floods == 1 ? "" : "s");
}
integrate void
sscom_rxsoft(struct sscom_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 = sscom_rbuf_size - sc->sc_rbavail;
if (cc == sscom_rbuf_size) {
sc->sc_floods++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_callout, 60 * hz,
sscomdiag, sc);
}
while (cc) {
code = get[0];
rsr = get[1];
if (rsr) {
if (ISSET(rsr, UERSTAT_OVERRUN)) {
sc->sc_overflows++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_callout,
60 * hz, sscomdiag, sc);
}
if (ISSET(rsr, UERSTAT_BREAK | UERSTAT_FRAME))
SET(code, TTY_FE);
if (ISSET(rsr, UERSTAT_PARITY))
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 -= sscom_rbuf_size << 1;
cc = 0;
} else {
/*
* Don't schedule any more receive processing
* until the line discipline tells us there's
* space available (through sscomhwiflow()).
* 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();
SSCOM_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);
sscom_enable_rxint(sc);
sc->sc_ucon |= UCON_ERRINT;
bus_space_write_2(sc->sc_iot, sc->sc_ioh, SSCOM_UCON,
sc->sc_ucon);
}
if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED);
sscom_hwiflow(sc);
}
}
SSCOM_UNLOCK(sc);
splx(s);
}
}
integrate void
sscom_txsoft(struct sscom_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
sscom_stsoft(struct sscom_softc *sc, struct tty *tp)
{
u_char msr, delta;
int s;
s = splserial();
SSCOM_LOCK(sc);
msr = sc->sc_msts;
delta = sc->sc_msr_delta;
sc->sc_msr_delta = 0;
SSCOM_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, MSTS_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;
}
}
if (sscom_debug)
sscomstatus(sc, "sscom_stsoft");
}
void
sscomsoft(void *arg)
{
struct sscom_softc *sc = arg;
struct tty *tp;
if (SSCOM_ISALIVE(sc) == 0)
return;
{
tp = sc->sc_tty;
if (sc->sc_rx_ready) {
sc->sc_rx_ready = 0;
sscom_rxsoft(sc, tp);
}
if (sc->sc_st_check) {
sc->sc_st_check = 0;
sscom_stsoft(sc, tp);
}
if (sc->sc_tx_done) {
sc->sc_tx_done = 0;
sscom_txsoft(sc, tp);
}
}
}
int
sscomrxintr(void *arg)
{
struct sscom_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;
if (SSCOM_ISALIVE(sc) == 0)
return 0;
SSCOM_LOCK(sc);
end = sc->sc_ebuf;
put = sc->sc_rbput;
cc = sc->sc_rbavail;
do {
u_char msts, delta;
u_char uerstat;
uint16_t ufstat;
ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT);
/* XXX: break interrupt with no character? */
if ( (ufstat & (UFSTAT_RXCOUNT|UFSTAT_RXFULL)) &&
!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
while (cc > 0) {
int cn_trapped = 0;
/* get status and received character.
read status register first */
uerstat = sscom_geterr(iot, ioh);
put[0] = sscom_getc(iot, ioh);
if (ISSET(uerstat, UERSTAT_BREAK)) {
int con_trapped = 0;
cn_check_magic(sc->sc_tty->t_dev,
CNC_BREAK, sscom_cnm_state);
if (con_trapped)
continue;
#if defined(KGDB)
if (ISSET(sc->sc_hwflags,
SSCOM_HW_KGDB)) {
kgdb_connect(1);
continue;
}
#endif
}
put[1] = uerstat;
cn_check_magic(sc->sc_tty->t_dev,
put[0], sscom_cnm_state);
if (!cn_trapped) {
put += 2;
if (put >= end)
put = sc->sc_rbuf;
cc--;
}
ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT);
if ( (ufstat & (UFSTAT_RXFULL|UFSTAT_RXCOUNT)) == 0 )
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);
sscom_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);
sscom_disable_rxint(sc);
sc->sc_ucon &= ~UCON_ERRINT;
bus_space_write_2(iot, ioh, SSCOM_UCON, sc->sc_ucon);
}
}
msts = sc->sc_read_modem_status(sc);
delta = msts ^ sc->sc_msts;
sc->sc_msts = msts;
#ifdef notyet
/*
* 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;
}
}
#endif
/*
* 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(~msts, sc->sc_msr_mask)) {
sc->sc_tbc = 0;
sc->sc_heldtbc = 0;
#ifdef SSCOM_DEBUG
if (sscom_debug)
sscomstatus(sc, "sscomintr ");
#endif
}
sc->sc_st_check = 1;
}
/*
* Done handling any receive interrupts.
*/
/*
* If we've delayed a parameter change, do it
* now, and restart * output.
*/
if ((ufstat & UFSTAT_TXCOUNT) == 0) {
/* XXX: we should check transmitter empty also */
if (sc->sc_heldchange) {
sscom_loadchannelregs(sc);
sc->sc_heldchange = 0;
sc->sc_tbc = sc->sc_heldtbc;
sc->sc_heldtbc = 0;
}
}
} while (0);
SSCOM_UNLOCK(sc);
/* Wake up the poller. */
softint_schedule(sc->sc_si);
#ifdef RND_COM
rnd_add_uint32(&sc->rnd_source, iir | rsr);
#endif
return 1;
}
int
sscomtxintr(void *arg)
{
struct sscom_softc *sc = arg;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
uint16_t ufstat;
if (SSCOM_ISALIVE(sc) == 0)
return 0;
SSCOM_LOCK(sc);
ufstat = bus_space_read_2(iot, ioh, SSCOM_UFSTAT);
/*
* If we've delayed a parameter change, do it
* now, and restart * output.
*/
if (sc->sc_heldchange && (ufstat & UFSTAT_TXCOUNT) == 0) {
/* XXX: we should check transmitter empty also */
sscom_loadchannelregs(sc);
sc->sc_heldchange = 0;
sc->sc_tbc = sc->sc_heldtbc;
sc->sc_heldtbc = 0;
}
/*
* See if data can be transmitted as well. Schedule tx
* done event if no data left and tty was marked busy.
*/
if (!ISSET(ufstat,UFSTAT_TXFULL)) {
/*
* Output the next chunk of the contiguous
* buffer, if any.
*/
if (sc->sc_tbc > 0) {
__sscom_output_chunk(sc, ufstat);
}
else {
/*
* Disable transmit sscompletion
* interrupts if necessary.
*/
if (sc->sc_hwflags & SSCOM_HW_TXINT)
sscom_disable_txint(sc);
if (sc->sc_tx_busy) {
sc->sc_tx_busy = 0;
sc->sc_tx_done = 1;
}
}
}
SSCOM_UNLOCK(sc);
/* Wake up the poller. */
softint_schedule(sc->sc_si);
#ifdef RND_COM
rnd_add_uint32(&sc->rnd_source, iir | rsr);
#endif
return 1;
}
#if defined(KGDB) || defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE)
/*
* Initialize UART for use as console or KGDB line.
*/
static int
sscom_init(bus_space_tag_t iot, const struct sscom_uart_info *config,
int rate, int frequency, tcflag_t cflag, bus_space_handle_t *iohp)
{
bus_space_handle_t ioh;
bus_addr_t iobase = config->iobase;
if (bus_space_map(iot, iobase, SSCOM_SIZE, 0, &ioh))
return ENOMEM; /* ??? */
bus_space_write_2(iot, ioh, SSCOM_UCON, 0);
bus_space_write_1(iot, ioh, SSCOM_UFCON,
#ifdef SSCOM_S3C2440
UFCON_TXTRIGGER_16 | UFCON_RXTRIGGER_16 |
#else
UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 |
#endif
UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET |
UFCON_FIFO_ENABLE );
/* tx/rx fifo reset are auto-cleared */
rate = sscomspeed(rate, frequency);
bus_space_write_2(iot, ioh, SSCOM_UBRDIV, rate);
bus_space_write_2(iot, ioh, SSCOM_ULCON, cflag2lcr(cflag));
/* enable UART */
bus_space_write_2(iot, ioh, SSCOM_UCON,
UCON_TXMODE_INT|UCON_RXMODE_INT);
bus_space_write_2(iot, ioh, SSCOM_UMCON, UMCON_RTS);
*iohp = ioh;
return 0;
}
#endif
#if defined(SSCOM0CONSOLE) || defined(SSCOM1CONSOLE)
/*
* Following are all routines needed for SSCOM to act as console
*/
struct consdev sscomcons = {
NULL, NULL, sscomcngetc, sscomcnputc, sscomcnpollc, NULL,
NULL, NULL, NODEV, CN_NORMAL
};
int
sscom_cnattach(bus_space_tag_t iot, const struct sscom_uart_info *config,
int rate, int frequency, tcflag_t cflag)
{
int res;
res = sscom_init(iot, config, rate, frequency, cflag, &sscomconsioh);
if (res)
return res;
cn_tab = &sscomcons;
cn_init_magic(&sscom_cnm_state);
cn_set_magic("\047\001"); /* default magic is BREAK */
sscomconstag = iot;
sscomconsunit = config->unit;
sscomconsrate = rate;
sscomconscflag = cflag;
return 0;
}
void
sscom_cndetach(void)
{
bus_space_unmap(sscomconstag, sscomconsioh, SSCOM_SIZE);
sscomconstag = NULL;
cn_tab = NULL;
}
/*
* 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 sscom_readahead[MAX_READAHEAD];
static int sscom_readaheadcount = 0;
int
sscomcngetc(dev_t dev)
{
int s = splserial();
u_char __attribute__((__unused__)) stat;
u_char c;
/* got a character from reading things earlier */
if (sscom_readaheadcount > 0) {
int i;
c = sscom_readahead[0];
for (i = 1; i < sscom_readaheadcount; i++) {
sscom_readahead[i-1] = sscom_readahead[i];
}
sscom_readaheadcount--;
splx(s);
return c;
}
/* block until a character becomes available */
while (!sscom_rxrdy(sscomconstag, sscomconsioh))
;
c = sscom_getc(sscomconstag, sscomconsioh);
stat = sscom_geterr(sscomconstag, sscomconsioh);
{
int cn_trapped __unused = 0;
if (!db_active)
cn_check_magic(dev, c, sscom_cnm_state);
}
splx(s);
return c;
}
/*
* Console kernel output character routine.
*/
void
sscomcnputc(dev_t dev, int c)
{
int s = splserial();
int timo;
int cin;
int __attribute__((__unused__)) stat;
if (sscom_readaheadcount < MAX_READAHEAD &&
sscom_rxrdy(sscomconstag, sscomconsioh)) {
int __attribute__((__unused__))cn_trapped = 0;
cin = sscom_getc(sscomconstag, sscomconsioh);
stat = sscom_geterr(sscomconstag, sscomconsioh);
cn_check_magic(dev, cin, sscom_cnm_state);
sscom_readahead[sscom_readaheadcount++] = cin;
}
/* wait for any pending transmission to finish */
timo = 150000;
while (ISSET(bus_space_read_2(sscomconstag, sscomconsioh, SSCOM_UFSTAT),
UFSTAT_TXFULL) && --timo)
continue;
bus_space_write_1(sscomconstag, sscomconsioh, SSCOM_UTXH, c);
SSCOM_BARRIER(sscomconstag, sscomconsioh, BR | BW);
#if 0
/* wait for this transmission to complete */
timo = 1500000;
while (!ISSET(bus_space_read_1(sscomconstag, sscomconsioh, SSCOM_UTRSTAT),
UTRSTAT_TXEMPTY) && --timo)
continue;
#endif
splx(s);
}
void
sscomcnpollc(dev_t dev, int on)
{
sscom_readaheadcount = 0;
}
#endif /* SSCOM0CONSOLE||SSCOM1CONSOLE */
#ifdef KGDB
int
sscom_kgdb_attach(bus_space_tag_t iot, const struct sscom_uart_info *config,
int rate, int frequency, tcflag_t cflag)
{
int res;
if (iot == sscomconstag && config->unit == sscomconsunit) {
printf( "console==kgdb_port (%d): kgdb disabled\n", sscomconsunit);
return EBUSY; /* cannot share with console */
}
res = sscom_init(iot, config, rate, frequency, cflag, &sscom_kgdb_ioh);
if (res)
return res;
kgdb_attach(sscom_kgdb_getc, sscom_kgdb_putc, NULL);
kgdb_dev = 123; /* unneeded, only to satisfy some tests */
sscom_kgdb_iot = iot;
sscom_kgdb_unit = config->unit;
return 0;
}
/* ARGSUSED */
int
sscom_kgdb_getc(void *arg)
{
int c, stat;
/* block until a character becomes available */
while (!sscom_rxrdy(sscom_kgdb_iot, sscom_kgdb_ioh))
;
c = sscom_getc(sscom_kgdb_iot, sscom_kgdb_ioh);
stat = sscom_geterr(sscom_kgdb_iot, sscom_kgdb_ioh);
return c;
}
/* ARGSUSED */
void
sscom_kgdb_putc(void *arg, int c)
{
int timo;
/* wait for any pending transmission to finish */
timo = 150000;
while (ISSET(bus_space_read_2(sscom_kgdb_iot, sscom_kgdb_ioh,
SSCOM_UFSTAT), UFSTAT_TXFULL) && --timo)
continue;
bus_space_write_1(sscom_kgdb_iot, sscom_kgdb_ioh, SSCOM_UTXH, c);
SSCOM_BARRIER(sscom_kgdb_iot, sscom_kgdb_ioh, BR | BW);
#if 0
/* wait for this transmission to complete */
timo = 1500000;
while (!ISSET(bus_space_read_1(sscom_kgdb_iot, sscom_kgdb_ioh,
SSCOM_UTRSTAT), UTRSTAT_TXEMPTY) && --timo)
continue;
#endif
}
#endif /* KGDB */
/* helper function to identify the sscom ports used by
console or KGDB (and not yet autoconf attached) */
int
sscom_is_console(bus_space_tag_t iot, int unit,
bus_space_handle_t *ioh)
{
bus_space_handle_t help;
if (!sscomconsattached &&
iot == sscomconstag && unit == sscomconsunit)
help = sscomconsioh;
#ifdef KGDB
else if (!sscom_kgdb_attached &&
iot == sscom_kgdb_iot && unit == sscom_kgdb_unit)
help = sscom_kgdb_ioh;
#endif
else
return 0;
if (ioh)
*ioh = help;
return 1;
}
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