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NetBSD/sys/arch/arm/ixp12x0/ixp12x0_com.c

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/* $NetBSD: ixp12x0_com.c,v 1.47 2015/04/13 21:18:41 riastradh Exp $ */
/*
* Copyright (c) 1998, 1999, 2001, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Ichiro FUKUHARA and Naoto Shimazaki.
*
* This code is derived from software contributed to The NetBSD Foundation
* by IWAMOTO Toshihiro.
*
* 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
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ixp12x0_com.c,v 1.47 2015/04/13 21:18:41 riastradh Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
#ifdef RND_COM
#include <sys/rndsource.h>
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/tty.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/kauth.h>
#include <sys/lwp.h>
#include <machine/intr.h>
#include <sys/bus.h>
#include <arm/ixp12x0/ixp12x0_comreg.h>
#include <arm/ixp12x0/ixp12x0_comvar.h>
#include <arm/ixp12x0/ixp12x0reg.h>
#include <arm/ixp12x0/ixp12x0var.h>
#include <arm/ixp12x0/ixpsipvar.h>
#include <dev/cons.h>
#include "ixpcom.h"
static int ixpcomparam(struct tty *, struct termios *);
static void ixpcomstart(struct tty *);
static int ixpcomhwiflow(struct tty *, int);
static u_int cflag2cr(tcflag_t);
static void ixpcom_iflush(struct ixpcom_softc *);
static void ixpcom_set_cr(struct ixpcom_softc *);
int ixpcomcngetc(dev_t);
void ixpcomcnputc(dev_t, int);
void ixpcomcnpollc(dev_t, int);
static void ixpcomsoft(void* arg);
inline static void ixpcom_txsoft(struct ixpcom_softc *, struct tty *);
inline static void ixpcom_rxsoft(struct ixpcom_softc *, struct tty *);
void ixpcomcnprobe(struct consdev *);
void ixpcomcninit(struct consdev *);
uint32_t ixpcom_cr = 0; /* tell cr to *_intr.c */
uint32_t ixpcom_imask = 0; /* intrrupt mask from *_intr.c */
static struct ixpcom_cons_softc {
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
bus_addr_t sc_baseaddr;
int sc_ospeed;
tcflag_t sc_cflag;
int sc_attached;
} ixpcomcn_sc;
static struct cnm_state ixpcom_cnm_state;
struct ixpcom_softc* ixpcom_sc = NULL;
extern struct cfdriver ixpcom_cd;
dev_type_open(ixpcomopen);
dev_type_close(ixpcomclose);
dev_type_read(ixpcomread);
dev_type_write(ixpcomwrite);
dev_type_ioctl(ixpcomioctl);
dev_type_stop(ixpcomstop);
dev_type_tty(ixpcomtty);
dev_type_poll(ixpcompoll);
const struct cdevsw ixpcom_cdevsw = {
.d_open = ixpcomopen,
.d_close = ixpcomclose,
.d_read = ixpcomread,
.d_write = ixpcomwrite,
.d_ioctl = ixpcomioctl,
.d_stop = ixpcomstop,
.d_tty = ixpcomtty,
.d_poll = ixpcompoll,
.d_mmap = nommap,
.d_kqfilter = ttykqfilter,
.d_discard = nodiscard,
.d_flag = D_TTY
};
struct consdev ixpcomcons = {
NULL, NULL, ixpcomcngetc, ixpcomcnputc, ixpcomcnpollc, NULL,
NULL, NULL, NODEV, CN_NORMAL
};
#ifndef DEFAULT_COMSPEED
#define DEFAULT_COMSPEED 38400
#endif
#define COMUNIT(x) TTUNIT(x)
#define COMDIALOUT(x) TTDIALOUT(x)
#define COM_ISALIVE(sc) ((sc)->enabled != 0 && \
device_is_active((sc)->sc_dev))
#define COM_BARRIER(t, h, f) bus_space_barrier((t), (h), 0, COM_NPORTS, (f))
#define COM_LOCK(sc);
#define COM_UNLOCK(sc);
#define CFLAGS2CR_MASK (CR_PE | CR_OES | CR_SBS | CR_DSS | CR_BRD)
void
ixpcom_attach_subr(struct ixpcom_softc *sc)
{
struct tty *tp;
ixpcom_sc = sc;
/* force to use ixpcom0 for console */
if (sc->sc_iot == ixpcomcn_sc.sc_iot
&& sc->sc_baseaddr == ixpcomcn_sc.sc_baseaddr) {
ixpcomcn_sc.sc_attached = 1;
sc->sc_speed = IXPCOMSPEED2BRD(ixpcomcn_sc.sc_ospeed);
/* Make sure the console is always "hardwired". */
/* XXX IXPCOM_SR should be checked */
delay(10000); /* wait for output to finish */
SET(sc->sc_hwflags, COM_HW_CONSOLE);
SET(sc->sc_swflags, TIOCFLAG_SOFTCAR);
}
tp = tty_alloc();
tp->t_oproc = ixpcomstart;
tp->t_param = ixpcomparam;
tp->t_hwiflow = ixpcomhwiflow;
sc->sc_tty = tp;
sc->sc_rbuf = malloc(IXPCOM_RING_SIZE << 1, M_DEVBUF, M_NOWAIT);
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = IXPCOM_RING_SIZE;
if (sc->sc_rbuf == NULL) {
printf("%s: unable to allocate ring buffer\n",
device_xname(sc->sc_dev));
return;
}
sc->sc_ebuf = sc->sc_rbuf + (IXPCOM_RING_SIZE << 1);
sc->sc_tbc = 0;
sc->sc_rie = sc->sc_xie = 0;
ixpcom_cr = IXPCOMSPEED2BRD(DEFAULT_COMSPEED)
| CR_UE | sc->sc_rie | sc->sc_xie | DSS_8BIT;
tty_attach(tp);
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
int maj;
/* locate the major number */
maj = cdevsw_lookup_major(&ixpcom_cdevsw);
cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev));
aprint_normal("%s: console\n", device_xname(sc->sc_dev));
}
sc->sc_si = softint_establish(SOFTINT_SERIAL, ixpcomsoft, 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 (!sc->enable)
sc->enabled = 1;
/* XXX configure register */
/* xxx_config(sc) */
SET(sc->sc_hwflags, COM_HW_DEV_OK);
}
static int
ixpcomparam(struct tty *tp, struct termios *t)
{
struct ixpcom_softc *sc
= device_lookup_private(&ixpcom_cd, COMUNIT(tp->t_dev));
uint32_t cr;
int s;
if (COM_ISALIVE(sc) == 0)
return (EIO);
cr = IXPCOMSPEED2BRD(t->c_ospeed);
if (t->c_ispeed && t->c_ispeed != t->c_ospeed)
return (EINVAL);
/*
* For the console, always force CLOCAL and !HUPCL, so that the port
* is always active.
*/
if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) ||
ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
SET(t->c_cflag, CLOCAL);
CLR(t->c_cflag, HUPCL);
}
/*
* 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);
cr |= cflag2cr(t->c_cflag);
s = splserial();
COM_LOCK(sc);
ixpcom_cr = (ixpcom_cr & ~CFLAGS2CR_MASK) | cr;
/*
* ixpcom don't have any hardware flow control.
* we skip it.
*/
/* 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
ixpcom_set_cr(sc);
}
COM_UNLOCK(sc);
splx(s);
/*
* Update the tty layer's idea of the carrier bit.
* We tell tty the carrier is always on.
*/
(void) (*tp->t_linesw->l_modem)(tp, 1);
#ifdef COM_DEBUG
if (com_debug)
comstatus(sc, "comparam ");
#endif
if (!ISSET(t->c_cflag, CHWFLOW)) {
if (sc->sc_tx_stopped) {
sc->sc_tx_stopped = 0;
ixpcomstart(tp);
}
}
return (0);
}
static int
ixpcomhwiflow(struct tty *tp, int block)
{
return (0);
}
static void
ixpcom_filltx(struct ixpcom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int n;
n = 0;
while (bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_TXR) {
if (n >= sc->sc_tbc)
break;
bus_space_write_4(iot, ioh, IXPCOM_DR,
0xff & *(sc->sc_tba + n));
n++;
}
sc->sc_tbc -= n;
sc->sc_tba += n;
}
static void
ixpcomstart(struct tty *tp)
{
struct ixpcom_softc *sc
= device_lookup_private(&ixpcom_cd, COMUNIT(tp->t_dev));
int s;
if (COM_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();
COM_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_xie, CR_XIE)) {
SET(sc->sc_xie, CR_XIE);
ixpcom_set_cr(sc);
}
/* Output the first chunk of the contiguous buffer. */
ixpcom_filltx(sc);
COM_UNLOCK(sc);
out:
splx(s);
return;
}
static void
ixpcom_break(struct ixpcom_softc *sc, int onoff)
{
if (onoff)
SET(ixpcom_cr, CR_BRK);
else
CLR(ixpcom_cr, CR_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
ixpcom_set_cr(sc);
}
}
static void
ixpcom_shutdown(struct ixpcom_softc *sc)
{
int s;
s = splserial();
COM_LOCK(sc);
/* Clear any break condition set with TIOCSBRK. */
ixpcom_break(sc, 0);
/* Turn off interrupts. */
sc->sc_rie = sc->sc_xie = 0;
ixpcom_set_cr(sc);
if (sc->disable) {
#ifdef DIAGNOSTIC
if (!sc->enabled)
panic("ixpcom_shutdown: not enabled?");
#endif
(*sc->disable)(sc);
sc->enabled = 0;
}
COM_UNLOCK(sc);
splx(s);
}
int
ixpcomopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct ixpcom_softc *sc;
struct tty *tp;
int s, s2;
int error;
sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev));
if (sc == NULL || !ISSET(sc->sc_hwflags, COM_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, COM_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();
COM_LOCK(sc);
if (sc->enable) {
if ((*sc->enable)(sc)) {
COM_UNLOCK(sc);
splx(s2);
splx(s);
printf("%s: device enable failed\n",
device_xname(sc->sc_dev));
return (EIO);
}
sc->enabled = 1;
#if 0
/* XXXXXXXXXXXXXXX */
com_config(sc);
#endif
}
/* Turn on interrupts. */
SET(sc->sc_rie, CR_RIE);
ixpcom_set_cr(sc);
#if 0
/* Fetch the current modem control status, needed later. */
sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr);
/* Clear PPS capture state on first open. */
sc->sc_ppsmask = 0;
sc->ppsparam.mode = 0;
#endif
COM_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, COM_HW_CONSOLE)) {
t.c_ospeed = ixpcomcn_sc.sc_ospeed;
t.c_cflag = ixpcomcn_sc.sc_cflag;
} 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 ixpcomparam() will do something. */
tp->t_ospeed = 0;
(void) ixpcomparam(tp, &t);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
ttychars(tp);
ttsetwater(tp);
s2 = splserial();
COM_LOCK(sc);
/* Clear the input ring, and unblock. */
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = IXPCOM_RING_SIZE;
ixpcom_iflush(sc);
CLR(sc->sc_rx_flags, RX_ANY_BLOCK);
#ifdef COM_DEBUG
if (ixpcom_debug)
comstatus(sc, "ixpcomopen ");
#endif
COM_UNLOCK(sc);
splx(s2);
}
splx(s);
error = ttyopen(tp, COMDIALOUT(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.
*/
ixpcom_shutdown(sc);
}
return (error);
}
int
ixpcomclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(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 (COM_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.
*/
ixpcom_shutdown(sc);
}
return (0);
}
int
ixpcomread(dev_t dev, struct uio *uio, int flag)
{
struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (COM_ISALIVE(sc) == 0)
return (EIO);
return ((*tp->t_linesw->l_read)(tp, uio, flag));
}
int
ixpcomwrite(dev_t dev, struct uio *uio, int flag)
{
struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (COM_ISALIVE(sc) == 0)
return (EIO);
return ((*tp->t_linesw->l_write)(tp, uio, flag));
}
int
ixpcompoll(dev_t dev, int events, struct lwp *l)
{
struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
if (COM_ISALIVE(sc) == 0)
return (EIO);
return ((*tp->t_linesw->l_poll)(tp, events, l));
}
struct tty *
ixpcomtty(dev_t dev)
{
struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
return (tp);
}
int
ixpcomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct ixpcom_softc *sc = device_lookup_private(&ixpcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
int error;
int s;
if (COM_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();
COM_LOCK(sc);
switch (cmd) {
case TIOCSBRK:
ixpcom_break(sc, 1);
break;
case TIOCCBRK:
ixpcom_break(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;
default:
error = EPASSTHROUGH;
break;
}
COM_UNLOCK(sc);
splx(s);
return (error);
}
/*
* Stop output on a line.
*/
void
ixpcomstop(struct tty *tp, int flag)
{
struct ixpcom_softc *sc
= device_lookup_private(&ixpcom_cd, COMUNIT(tp->t_dev));
int s;
s = splserial();
COM_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);
}
COM_UNLOCK(sc);
splx(s);
}
static u_int
cflag2cr(tcflag_t cflag)
{
u_int cr;
cr = (cflag & PARENB) ? CR_PE : 0;
cr |= (cflag & PARODD) ? CR_OES : 0;
cr |= (cflag & CSTOPB) ? CR_SBS : 0;
cr |= ((cflag & CSIZE) == CS8) ? DSS_8BIT : 0;
return (cr);
}
static void
ixpcom_iflush(struct ixpcom_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_4(iot, ioh, IXPCOM_SR), SR_RXR)
&& --timo)
#ifdef DIAGNOSTIC
reg =
#else
(void)
#endif
bus_space_read_4(iot, ioh, IXPCOM_DR);
#ifdef DIAGNOSTIC
if (!timo)
printf("%s: com_iflush timeout %02x\n", device_xname(sc->sc_dev),
reg);
#endif
}
static void
ixpcom_set_cr(struct ixpcom_softc *sc)
{
/* XXX */
ixpcom_cr &= ~(CR_RIE | CR_XIE);
ixpcom_cr |= sc->sc_rie | sc->sc_xie;
bus_space_write_4(sc->sc_iot, sc->sc_ioh, IXPCOM_CR,
ixpcom_cr & ~ixpcom_imask);
}
int
ixpcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh, int ospeed, tcflag_t cflag)
{
int cr;
cn_tab = &ixpcomcons;
cn_init_magic(&ixpcom_cnm_state);
/*
* XXX
*
* ixpcom cannot detect a break. It can only detect framing
* errors. And, a sequence of "framing error, framing error"
* meens a break. So I made this hack:
*
* 1. Set default magic is a sequence of "BREAK, BREAK".
* 2. Tell cn_check_magic() a "framing error" as BREAK.
*
* see ixpcom_intr() too.
*
*/
/* default magic is a couple of BREAK. */
cn_set_magic("\047\001\047\001");
ixpcomcn_sc.sc_iot = iot;
ixpcomcn_sc.sc_ioh = ioh;
ixpcomcn_sc.sc_baseaddr = iobase;
ixpcomcn_sc.sc_ospeed = ospeed;
ixpcomcn_sc.sc_cflag = cflag;
cr = cflag2cr(cflag);
cr |= IXPCOMSPEED2BRD(ospeed);
cr |= CR_UE;
ixpcom_cr = cr;
/* enable the UART */
bus_space_write_4(iot, iobase, IXPCOM_CR, cr);
return (0);
}
void
ixpcomcnprobe(struct consdev *cp)
{
cp->cn_pri = CN_REMOTE;
}
void
ixpcomcnpollc(dev_t dev, int on)
{
}
void
ixpcomcnputc(dev_t dev, int c)
{
int s;
bus_space_tag_t iot = ixpcomcn_sc.sc_iot;
bus_space_handle_t ioh = ixpcomcn_sc.sc_ioh;
s = splserial();
while(!(bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_TXR))
;
bus_space_write_4(iot, ioh, IXPCOM_DR, c);
#ifdef DEBUG
if (c == '\r') {
while(!(bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_TXE))
;
}
#endif
splx(s);
}
int
ixpcomcngetc(dev_t dev)
{
int c;
int s;
bus_space_tag_t iot = ixpcomcn_sc.sc_iot;
bus_space_handle_t ioh = ixpcomcn_sc.sc_ioh;
s = splserial();
while(!(bus_space_read_4(iot, ioh, IXPCOM_SR) & SR_RXR))
;
c = bus_space_read_4(iot, ioh, IXPCOM_DR);
c &= 0xff;
splx(s);
return (c);
}
inline static void
ixpcom_txsoft(struct ixpcom_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);
}
inline static void
ixpcom_rxsoft(struct ixpcom_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 lsr;
int code;
int s;
end = sc->sc_ebuf;
get = sc->sc_rbget;
scc = cc = IXPCOM_RING_SIZE - sc->sc_rbavail;
#if 0
if (cc == IXPCOM_RING_SIZE) {
sc->sc_floods++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_callout, 60 * hz,
comdiag, sc);
}
#endif
while (cc) {
code = get[0];
lsr = get[1];
if (ISSET(lsr, DR_ROR | DR_FRE | DR_PRE)) {
#if 0
if (ISSET(lsr, DR_ROR)) {
sc->sc_overflows++;
if (sc->sc_errors++ == 0)
callout_reset(&sc->sc_diag_callout,
60 * hz, comdiag, sc);
}
#endif
if (ISSET(lsr, DR_FRE))
SET(code, TTY_FE);
if (ISSET(lsr, DR_PRE))
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 -= IXPCOM_RING_SIZE << 1;
cc = 0;
} else {
/*
* Don't schedule any more receive processing
* until the line discipline tells us there's
* space available (through comhwiflow()).
* Leave the rest of the data in the input
* buffer.
*/
SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
}
break;
}
get += 2;
if (get >= end)
get = sc->sc_rbuf;
cc--;
}
if (cc != scc) {
sc->sc_rbget = get;
s = splserial();
COM_LOCK(sc);
cc = sc->sc_rbavail += scc - cc;
/* Buffers should be ok again, release possible block. */
if (cc >= 1) {
if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED);
SET(sc->sc_rie, CR_RIE);
ixpcom_set_cr(sc);
}
if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED);
#if 0
com_hwiflow(sc);
#endif
}
}
COM_UNLOCK(sc);
splx(s);
}
}
static void
ixpcomsoft(void* arg)
{
struct ixpcom_softc *sc = arg;
if (COM_ISALIVE(sc) == 0)
return;
if (sc->sc_rx_ready) {
sc->sc_rx_ready = 0;
ixpcom_rxsoft(sc, sc->sc_tty);
}
if (sc->sc_tx_done) {
sc->sc_tx_done = 0;
ixpcom_txsoft(sc, sc->sc_tty);
}
}
int
ixpcomintr(void* arg)
{
struct ixpcom_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_int cr;
u_int sr;
uint32_t c;
if (COM_ISALIVE(sc) == 0)
return (0);
COM_LOCK(sc);
cr = bus_space_read_4(iot, ioh, IXPCOM_CR) & CR_UE;
if (!cr) {
COM_UNLOCK(sc);
return (0);
}
sr = bus_space_read_4(iot, ioh, IXPCOM_SR);
if (!ISSET(sr, SR_TXR | SR_RXR))
return (0);
/*
* XXX
*
* ixpcom cannot detect a break. It can only detect framing
* errors. And, a sequence of "framing error, framing error"
* meens a break. So I made this hack:
*
* 1. Set default magic is a sequence of "BREAK, BREAK".
* 2. Tell cn_check_magic() a "framing error" as BREAK.
*
* see ixpcomcnattach() too.
*
*/
if (ISSET(sr, SR_FRE)) {
cn_check_magic(sc->sc_tty->t_dev,
CNC_BREAK, ixpcom_cnm_state);
}
end = sc->sc_ebuf;
put = sc->sc_rbput;
cc = sc->sc_rbavail;
if (ISSET(sr, SR_RXR)) {
if (!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
while (cc > 0) {
if (!ISSET(sr, SR_RXR))
break;
c = bus_space_read_4(iot, ioh, IXPCOM_DR);
if (ISSET(c, DR_FRE)) {
cn_check_magic(sc->sc_tty->t_dev,
CNC_BREAK,
ixpcom_cnm_state);
}
put[0] = c & 0xff;
put[1] = (c >> 8) & 0xff;
cn_check_magic(sc->sc_tty->t_dev,
put[0], ixpcom_cnm_state);
put += 2;
if (put >= end)
put = sc->sc_rbuf;
cc--;
sr = bus_space_read_4(iot, ioh, IXPCOM_SR);
}
/*
* 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.
*/
/* but ixpcom cannot. X-( */
/*
* 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_rie, CR_RIE);
ixpcom_set_cr(sc);
}
} else {
#ifdef DIAGNOSTIC
panic("ixpcomintr: we shouldn't reach here");
#endif
CLR(sc->sc_rie, CR_RIE);
ixpcom_set_cr(sc);
}
}
/*
* 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.
*/
sr = bus_space_read_4(iot, ioh, IXPCOM_SR);
if (ISSET(sr, SR_TXR)) {
/*
* If we've delayed a parameter change, do it now, and restart
* output.
*/
if (sc->sc_heldchange) {
ixpcom_set_cr(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) {
ixpcom_filltx(sc);
} else {
/* Disable transmit completion interrupts if necessary. */
if (ISSET(sc->sc_xie, CR_XIE)) {
CLR(sc->sc_xie, CR_XIE);
ixpcom_set_cr(sc);
}
if (sc->sc_tx_busy) {
sc->sc_tx_busy = 0;
sc->sc_tx_done = 1;
}
}
}
COM_UNLOCK(sc);
/* Wake up the poller. */
softint_schedule(sc->sc_si);
#ifdef RND_COM
rnd_add_uint32(&sc->rnd_source, iir | lsr);
#endif
return (1);
}
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