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NetBSD/sys/arch/arm/sa11x0/sa11x0_com.c

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/* $NetBSD: sa11x0_com.c,v 1.50 2012/02/02 19:42:58 tls Exp $ */
/*-
* Copyright (c) 1998, 1999, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* 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: sa11x0_com.c,v 1.50 2012/02/02 19:42:58 tls Exp $");
#include "opt_com.h"
#include "opt_ddb.h"
#include "opt_ddbparam.h"
#include "opt_kgdb.h"
#include "opt_multiprocessor.h"
#include "opt_lockdebug.h"
#include "rnd.h"
#ifdef RND_COM
#include <sys/rnd.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 <dev/cons.h>
#include <sys/bus.h>
#include <arm/sa11x0/sa11x0_reg.h>
#include <arm/sa11x0/sa11x0_var.h>
#include <arm/sa11x0/sa11x0_comreg.h>
#include <arm/sa11x0/sa11x0_comvar.h>
#include <arm/sa11x0/sa11x0_gpioreg.h>
#ifdef hpcarm
#include <hpc/include/platid.h>
#include <hpc/include/platid_mask.h>
#endif
#include "sacom.h"
dev_type_open(sacomopen);
dev_type_close(sacomclose);
dev_type_read(sacomread);
dev_type_write(sacomwrite);
dev_type_ioctl(sacomioctl);
dev_type_stop(sacomstop);
dev_type_tty(sacomtty);
dev_type_poll(sacompoll);
const struct cdevsw sacom_cdevsw = {
sacomopen, sacomclose, sacomread, sacomwrite, sacomioctl,
sacomstop, sacomtty, sacompoll, nommap, ttykqfilter, D_TTY
};
static int sacom_match(device_t, cfdata_t, void *);
static void sacom_attach(device_t, device_t, void *);
static void sacom_filltx(struct sacom_softc *);
static void sacom_attach_subr(struct sacom_softc *);
#if defined(DDB) || defined(KGDB)
static void sacom_enable_debugport(struct sacom_softc *);
#endif
int sacom_detach(device_t, int);
void sacom_config(struct sacom_softc *);
int sacom_activate(device_t, enum devact);
void sacom_shutdown(struct sacom_softc *);
static u_int cflag2cr0(tcflag_t);
int sacomparam(struct tty *, struct termios *);
void sacomstart(struct tty *);
int sacomhwiflow(struct tty *, int);
void sacom_loadchannelregs(struct sacom_softc *);
void sacom_hwiflow(struct sacom_softc *);
void sacom_break(struct sacom_softc *, int);
void sacom_modem(struct sacom_softc *, int);
void tiocm_to_sacom(struct sacom_softc *, u_long, int);
int sacom_to_tiocm(struct sacom_softc *);
void sacom_iflush(struct sacom_softc *);
int sacominit(bus_space_tag_t, bus_addr_t, int, tcflag_t,
bus_space_handle_t *);
int sacom_is_console(bus_space_tag_t, bus_addr_t,
bus_space_handle_t *);
void sacomsoft(void *);
static inline void sacom_rxsoft(struct sacom_softc *, struct tty *);
static inline void sacom_txsoft(struct sacom_softc *, struct tty *);
static inline void sacom_stsoft(struct sacom_softc *, struct tty *);
static inline void sacom_schedrx(struct sacom_softc *);
#ifdef hpcarm
/* HPCARM specific functions */
static void sacom_j720_init(device_t, device_t);
#endif
#define COMUNIT_MASK 0x7ffff
#define COMDIALOUT_MASK 0x80000
#define COMUNIT(x) (minor(x) & COMUNIT_MASK)
#define COMDIALOUT(x) (minor(x) & COMDIALOUT_MASK)
#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)
int sacomintr(void *);
int sacomcngetc(dev_t);
void sacomcnputc(dev_t, int);
void sacomcnpollc(dev_t, int);
void sacomcnprobe(struct consdev *);
void sacomcninit(struct consdev *);
extern struct bus_space sa11x0_bs_tag;
static bus_space_tag_t sacomconstag;
static bus_space_handle_t sacomconsioh;
static bus_addr_t sacomconsaddr = SACOM3_BASE; /* XXX */
static int sacomconsattached;
static int sacomconsrate;
static tcflag_t sacomconscflag;
CFATTACH_DECL_NEW(sacom, sizeof(struct sacom_softc),
sacom_match, sacom_attach, NULL, NULL);
extern struct cfdriver sacom_cd;
#ifdef hpcarm
struct platid_data sacom_platid_table[] = {
{ &platid_mask_MACH_HP_JORNADA_7XX, sacom_j720_init },
{ NULL, NULL }
};
#endif
struct consdev sacomcons = {
NULL, NULL, sacomcngetc, sacomcnputc, sacomcnpollc, NULL,
NULL, NULL, NODEV, CN_NORMAL
};
#ifndef CONMODE
#define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */
#endif
#ifndef CONSPEED
#define CONSPEED 9600
#endif
#ifndef CONADDR
#define CONADDR SACOM3_BASE
#endif
static int
sacom_match(device_t parent, cfdata_t match, void *aux)
{
return 1;
}
void
sacom_attach(device_t parent, device_t self, void *aux)
{
struct sacom_softc *sc = device_private(self);
struct sa11x0_attach_args *sa = aux;
#ifdef hpcarm
struct platid_data *p;
void (*mdinit)(device_t, device_t);
#endif
aprint_normal("\n");
sc->sc_dev = self;
sc->sc_iot = sa->sa_iot;
sc->sc_baseaddr = sa->sa_addr;
if (bus_space_map(sa->sa_iot, sa->sa_addr, sa->sa_size, 0,
&sc->sc_ioh)) {
aprint_normal_dev(self, "unable to map registers\n");
return;
}
switch (sc->sc_baseaddr) {
case SACOM1_BASE:
aprint_normal_dev(self, "SA-11x0 UART1\n");
break;
case SACOM2_BASE:
aprint_normal_dev(self, "SA-11x0 UART2 (IRDA)\n");
break;
case SACOM3_BASE:
aprint_normal_dev(self, "SA-11x0 UART3\n");
break;
default:
aprint_normal_dev(self, "unknown SA-11x0 UART\n");
break;
}
sacom_attach_subr(sc);
#ifdef hpcarm
/* Do hpcarm specific initialization, if any */
if ((p = platid_search_data(&platid, sacom_platid_table)) != NULL) {
mdinit = p->data;
(*mdinit)(parent, self);
}
#endif
sa11x0_intr_establish(0, sa->sa_intr, 1, IPL_SERIAL, sacomintr, sc);
}
void
sacom_attach_subr(struct sacom_softc *sc)
{
bus_addr_t iobase = sc->sc_baseaddr;
bus_space_tag_t iot = sc->sc_iot;
struct tty *tp;
/* XXX Do we need to disable interrupts here? */
if (iot == sacomconstag && iobase == sacomconsaddr) {
sacomconsattached = 1;
sc->sc_speed = SACOMSPEED(sacomconsrate);
/* Make sure the console is always "hardwired". */
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 = sacomstart;
tp->t_param = sacomparam;
tp->t_hwiflow = sacomhwiflow;
sc->sc_tty = tp;
sc->sc_rbuf = malloc(SACOM_RING_SIZE << 1, M_DEVBUF, M_NOWAIT);
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = SACOM_RING_SIZE;
if (sc->sc_rbuf == NULL) {
aprint_normal_dev(sc->sc_dev, "unable to allocate ring buffer\n");
return;
}
sc->sc_ebuf = sc->sc_rbuf + (SACOM_RING_SIZE << 1);
sc->sc_tbc = 0;
tty_attach(tp);
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
int maj;
/* locate the major number */
maj = cdevsw_lookup_major(&sacom_cdevsw);
cn_tab->cn_dev = makedev(maj, device_unit(sc->sc_dev));
delay(10000); /* XXX */
aprint_normal_dev(sc->sc_dev, "console\n");
delay(10000); /* XXX */
}
sc->sc_si = softint_establish(SOFTINT_SERIAL, sacomsoft, sc);
#ifdef RND_COM
rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev),
RND_TYPE_TTY, 0);
#endif
/* if there are no enable/disable functions, assume the device
is always enabled */
if (!sc->enable)
sc->enabled = 1;
sacom_config(sc);
SET(sc->sc_hwflags, COM_HW_DEV_OK);
}
/* This is necessary when dynamically changing SAIP configuration. */
int
sacom_detach(device_t dev, int flags)
{
struct sacom_softc *sc = device_private(dev);
int maj, mn;
if (sc->sc_hwflags & (COM_HW_CONSOLE|COM_HW_KGDB))
return EBUSY;
if (sc->disable != NULL && sc->enabled != 0) {
(*sc->disable)(sc);
sc->enabled = 0;
}
/* locate the major number */
maj = cdevsw_lookup_major(&sacom_cdevsw);
/* Nuke the vnodes for any open instances. */
mn = device_unit(dev);
vdevgone(maj, mn, mn, VCHR);
mn |= COMDIALOUT_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);
tty_free(sc->sc_tty);
/* Unhook the soft interrupt handler. */
softint_disestablish(sc->sc_si);
#ifdef RND_COM
/* Unhook the entropy source. */
rnd_detach_source(&sc->rnd_source);
#endif
return 0;
}
void
sacom_config(struct sacom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* Disable engine before configuring the device. */
sc->sc_cr3 = 0;
bus_space_write_4(iot, ioh, SACOM_CR3, sc->sc_cr3);
#ifdef DDB
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE))
sacom_enable_debugport(sc);
#endif
}
#ifdef DDB
static void
sacom_enable_debugport(struct sacom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int s;
s = splserial();
COM_LOCK(sc);
sc->sc_cr3 = CR3_RXE | CR3_TXE;
bus_space_write_4(iot, ioh, SACOM_CR3, sc->sc_cr3);
COM_UNLOCK(sc);
splx(s);
}
#endif
int
sacom_activate(device_t dev, enum devact act)
{
struct sacom_softc *sc = device_private(dev);
switch (act) {
case DVACT_DEACTIVATE:
sc->enabled = 0;
return 0;
default:
return EOPNOTSUPP;
}
}
void
sacom_shutdown(struct sacom_softc *sc)
{
struct tty *tp = sc->sc_tty;
int s;
s = splserial();
COM_LOCK(sc);
/* Clear any break condition set with TIOCSBRK. */
sacom_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)) {
sacom_modem(sc, 0);
COM_UNLOCK(sc);
splx(s);
/* XXX tsleep will only timeout */
(void) tsleep(sc, TTIPRI, ttclos, hz);
s = splserial();
COM_LOCK(sc);
}
/* Turn off interrupts. */
sc->sc_cr3 = 0;
bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACOM_CR3, sc->sc_cr3);
if (sc->disable) {
#ifdef DIAGNOSTIC
if (!sc->enabled)
panic("sacom_shutdown: not enabled?");
#endif
(*sc->disable)(sc);
sc->enabled = 0;
}
COM_UNLOCK(sc);
splx(s);
}
int
sacomopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct sacom_softc *sc;
struct tty *tp;
int s, s2;
int error;
sc = device_lookup_private(&sacom_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;
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);
aprint_normal_dev(sc->sc_dev, "device enable failed\n");
return EIO;
}
sc->enabled = 1;
sacom_config(sc);
}
/* Turn on interrupts. */
sc->sc_cr3 = CR3_RXE | CR3_TXE | CR3_RIE | CR3_TIE;
bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACOM_CR3,
sc->sc_cr3);
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 = sacomconsrate;
t.c_cflag = sacomconscflag;
} 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 sacomparam() will do something. */
tp->t_ospeed = 0;
(void) sacomparam(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);
/*
* 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.
*/
sacom_modem(sc, 1);
/* Clear the input ring, and unblock. */
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = SACOM_RING_SIZE;
sacom_iflush(sc);
CLR(sc->sc_rx_flags, RX_ANY_BLOCK);
sacom_hwiflow(sc);
#ifdef COM_DEBUG
if (sacom_debug)
comstatus(sc, "sacomopen ");
#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.
*/
sacom_shutdown(sc);
}
return error;
}
int
sacomclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct sacom_softc *sc =
device_lookup_private(&sacom_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.
*/
sacom_shutdown(sc);
}
return 0;
}
int
sacomread(dev_t dev, struct uio *uio, int flag)
{
struct sacom_softc *sc =
device_lookup_private(&sacom_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
sacomwrite(dev_t dev, struct uio *uio, int flag)
{
struct sacom_softc *sc =
device_lookup_private(&sacom_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
sacompoll(dev_t dev, int events, struct lwp *l)
{
struct sacom_softc *sc =
device_lookup_private(&sacom_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 *
sacomtty(dev_t dev)
{
struct sacom_softc *sc =
device_lookup_private(&sacom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
return tp;
}
int
sacomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct sacom_softc *sc =
device_lookup_private(&sacom_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:
sacom_break(sc, 1);
break;
case TIOCCBRK:
sacom_break(sc, 0);
break;
case TIOCSDTR:
sacom_modem(sc, 1);
break;
case TIOCCDTR:
sacom_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_sacom(sc, cmd, *(int *)data);
break;
case TIOCMGET:
*(int *)data = sacom_to_tiocm(sc);
break;
default:
error = EPASSTHROUGH;
break;
}
COM_UNLOCK(sc);
splx(s);
#ifdef COM_DEBUG
if (sacom_debug)
comstatus(sc, "comioctl ");
#endif
return error;
}
static inline void
sacom_schedrx(struct sacom_softc *sc)
{
sc->sc_rx_ready = 1;
/* Wake up the poller. */
softint_schedule(sc->sc_si);
}
void
sacom_break(struct sacom_softc *sc, int onoff)
{
if (onoff)
SET(sc->sc_cr3, CR3_BRK);
else
CLR(sc->sc_cr3, CR3_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
sacom_loadchannelregs(sc);
}
}
void
sacom_modem(struct sacom_softc *sc, int onoff)
{
if (!sc->sc_heldchange) {
if (sc->sc_tx_busy) {
sc->sc_heldtbc = sc->sc_tbc;
sc->sc_tbc = 0;
sc->sc_heldchange = 1;
} else
sacom_loadchannelregs(sc);
}
}
void
tiocm_to_sacom(struct sacom_softc *sc, u_long how, int ttybits)
{
}
int
sacom_to_tiocm(struct sacom_softc *sc)
{
int ttybits = 0;
if (sc->sc_cr3 != 0)
SET(ttybits, TIOCM_LE);
return ttybits;
}
static u_int
cflag2cr0(tcflag_t cflag)
{
u_int cr0;
cr0 = (cflag & PARENB) ? CR0_PE : 0;
cr0 |= (cflag & PARODD) ? 0 : CR0_OES;
cr0 |= (cflag & CSTOPB) ? CR0_SBS : 0;
cr0 |= ((cflag & CSIZE) == CS8) ? CR0_DSS : 0;
return cr0;
}
int
sacomparam(struct tty *tp, struct termios *t)
{
struct sacom_softc *sc =
device_lookup_private(&sacom_cd, COMUNIT(tp->t_dev));
int ospeed = SACOMSPEED(t->c_ospeed);
u_int cr0;
int s;
if (COM_ISALIVE(sc) == 0)
return EIO;
/* Check requested parameters. */
if (ospeed < 0)
return EINVAL;
if (t->c_ispeed && t->c_ispeed != t->c_ospeed)
return EINVAL;
/*
* For the console, always force CLOCAL and !HUPCL, so that the port
* is always active.
*/
if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) ||
ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
SET(t->c_cflag, CLOCAL);
CLR(t->c_cflag, HUPCL);
}
/*
* 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;
cr0 = cflag2cr0(t->c_cflag);
s = splserial();
COM_LOCK(sc);
sc->sc_cr0 = cr0;
sc->sc_speed = 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
sacom_loadchannelregs(sc);
}
if (!ISSET(t->c_cflag, CHWFLOW)) {
/* Disable the high water mark. */
if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) {
CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
sacom_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);
sacom_hwiflow(sc);
}
}
COM_UNLOCK(sc);
splx(s);
(void) (*tp->t_linesw->l_modem)(tp, 1);
#ifdef COM_DEBUG
if (sacom_debug)
comstatus(sc, "comparam ");
#endif
return 0;
}
void
sacom_iflush(struct sacom_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 = 50;
/* flush any pending I/O */
if (sc->sc_cr3 & CR3_RXE) {
while (ISSET(bus_space_read_4(iot, ioh, SACOM_SR1), SR1_RNE)
&& --timo)
#ifdef DIAGNOSTIC
reg =
#else
(void)
#endif
bus_space_read_4(iot, ioh, SACOM_DR);
}
#if 0
/* XXX is it good idea to wait TX finish? */
if (sc->sc_cr3 & CR3_TXE) {
timo = 500;
while (ISSET(bus_space_read_4(iot, ioh, SACOM_SR1), SR1_TBY)
&& --timo)
delay(100);
}
#endif
#ifdef DIAGNOSTIC
if (!timo)
aprint_debug_dev(sc->sc_dev, "sacom_iflush timeout %02x\n", reg);
#endif
}
void
sacom_loadchannelregs(struct sacom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* XXXXX necessary? */
sacom_iflush(sc);
/* Need to stop engines first. */
bus_space_write_4(iot, ioh, SACOM_CR3, 0);
bus_space_write_4(iot, ioh, SACOM_CR1, sc->sc_speed >> 8);
bus_space_write_4(iot, ioh, SACOM_CR2, sc->sc_speed & 0xff);
bus_space_write_4(iot, ioh, SACOM_CR0, sc->sc_cr0);
bus_space_write_4(iot, ioh, SACOM_CR3, sc->sc_cr3);
}
int
sacomhwiflow(struct tty *tp, int block)
{
#if 0
struct sacom_softc *sc =
device_lookup_private(&sacom_cd, COMUNIT(tp->t_dev));
int s;
if (COM_ISALIVE(sc) == 0)
return 0;
if (sc->sc_mcr_rts == 0)
return 0;
s = splserial();
COM_LOCK(sc);
if (block) {
if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
SET(sc->sc_rx_flags, RX_TTY_BLOCKED);
sacom_hwiflow(sc);
}
} else {
if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) {
CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED);
sacom_schedrx(sc);
}
if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_TTY_BLOCKED);
sacom_hwiflow(sc);
}
}
COM_UNLOCK(sc);
splx(s);
#endif
return 1;
}
/*
* (un)block input via hw flowcontrol
*/
void
sacom_hwiflow(struct sacom_softc *sc)
{
#if 0
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* XXX implement */
#endif
}
void
sacomstart(struct tty *tp)
{
struct sacom_softc *sc =
device_lookup_private(&sacom_cd, COMUNIT(tp->t_dev));
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int s;
if (COM_ISALIVE(sc) == 0)
return;
s = spltty();
if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP))
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_cr3, CR3_TIE)) {
SET(sc->sc_cr3, CR3_TIE);
bus_space_write_4(iot, ioh, SACOM_CR3, sc->sc_cr3);
}
/* Output the first chunk of the contiguous buffer. */
sacom_filltx(sc);
COM_UNLOCK(sc);
out:
splx(s);
return;
}
void
sacom_filltx(struct sacom_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int c, n;
n = 0;
while (bus_space_read_4(iot, ioh, SACOM_SR1) & SR1_TNF) {
if (n == SACOM_TXFIFOLEN || n == sc->sc_tbc)
break;
c = *(sc->sc_tba + n);
c &= 0xff;
bus_space_write_4(iot, ioh, SACOM_DR, c);
n++;
}
sc->sc_tbc -= n;
sc->sc_tba += n;
}
/*
* Stop output on a line.
*/
void
sacomstop(struct tty *tp, int flag)
{
struct sacom_softc *sc =
device_lookup_private(&sacom_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 inline void
sacom_rxsoft(struct sacom_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 sr1;
int code;
int s;
end = sc->sc_ebuf;
get = sc->sc_rbget;
scc = cc = SACOM_RING_SIZE - sc->sc_rbavail;
while (cc) {
code = get[0];
sr1 = get[1];
if (ISSET(sr1, SR1_FRE))
SET(code, TTY_FE);
if (ISSET(sr1, SR1_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 -= SACOM_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_cr3, CR3_RIE);
bus_space_write_4(sc->sc_iot, sc->sc_ioh,
SACOM_CR3, sc->sc_cr3);
}
}
COM_UNLOCK(sc);
splx(s);
}
}
static inline void
sacom_txsoft(struct sacom_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);
}
static inline void
sacom_stsoft(struct sacom_softc *sc, struct tty *tp)
{
}
void
sacomsoft(void *arg)
{
struct sacom_softc *sc = arg;
struct tty *tp;
if (COM_ISALIVE(sc) == 0)
return;
tp = sc->sc_tty;
if (sc->sc_rx_ready) {
sc->sc_rx_ready = 0;
sacom_rxsoft(sc, tp);
}
if (sc->sc_st_check) {
sc->sc_st_check = 0;
sacom_stsoft(sc, tp);
}
if (sc->sc_tx_done) {
sc->sc_tx_done = 0;
sacom_txsoft(sc, tp);
}
}
int
sacomintr(void *arg)
{
struct sacom_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 sr0, sr1;
if (COM_ISALIVE(sc) == 0)
return 0;
COM_LOCK(sc);
sr0 = bus_space_read_4(iot, ioh, SACOM_SR0);
if (!sr0) {
COM_UNLOCK(sc);
return 0;
}
if (ISSET(sr0, SR0_EIF))
/* XXX silently discard error bits */
bus_space_read_4(iot, ioh, SACOM_DR);
if (ISSET(sr0, SR0_RBB))
bus_space_write_4(iot, ioh, SACOM_SR0, SR0_RBB);
if (ISSET(sr0, SR0_REB)) {
bus_space_write_4(iot, ioh, SACOM_SR0, SR0_REB);
#if defined(DDB) || defined(KGDB)
#ifndef DDB_BREAK_CHAR
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
console_debugger();
}
#endif
#endif /* DDB || KGDB */
}
end = sc->sc_ebuf;
put = sc->sc_rbput;
cc = sc->sc_rbavail;
sr1 = bus_space_read_4(iot, ioh, SACOM_SR1);
if (ISSET(sr0, SR0_RFS | SR0_RID)) {
if (!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
while (cc > 0) {
if (!ISSET(sr1, SR1_RNE)) {
bus_space_write_4(iot, ioh, SACOM_SR0,
SR0_RID);
break;
}
put[0] = bus_space_read_4(iot, ioh, SACOM_DR);
put[1] = sr1;
#if defined(DDB) && defined(DDB_BREAK_CHAR)
if (put[0] == DDB_BREAK_CHAR &&
ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
console_debugger();
sr1 = bus_space_read_4(iot, ioh, SACOM_SR1);
continue;
}
#endif
put += 2;
if (put >= end)
put = sc->sc_rbuf;
cc--;
sr1 = bus_space_read_4(iot, ioh, SACOM_SR1);
}
/*
* 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;
/* XXX do RX hardware flow control */
/*
* 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_cr3, CR3_RIE);
bus_space_write_4(iot, ioh, SACOM_CR3,
sc->sc_cr3);
}
} else {
#ifdef DIAGNOSTIC
panic("sacomintr: we shouldn't reach here");
#endif
CLR(sc->sc_cr3, CR3_RIE);
bus_space_write_4(iot, ioh, SACOM_CR3, sc->sc_cr3);
}
}
/*
* 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.
*/
sr0 = bus_space_read_4(iot, ioh, SACOM_SR0);
if (ISSET(sr0, SR0_TFS)) {
/*
* If we've delayed a parameter change, do it now, and restart
* output.
* XXX sacom_loadchannelregs() waits TX completion,
* XXX resulting in ~0.1s hang (300bps, 4 bytes) in worst case
*/
if (sc->sc_heldchange) {
sacom_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) {
sacom_filltx(sc);
} else {
/* Disable transmit completion interrupts if necessary. */
if (ISSET(sc->sc_cr3, CR3_TIE)) {
CLR(sc->sc_cr3, CR3_TIE);
bus_space_write_4(iot, ioh, SACOM_CR3,
sc->sc_cr3);
}
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;
}
static void
sacom_j720_init(device_t parent, device_t self)
{
struct sa11x0_softc *sasc;
sasc = device_private(parent);
/* XXX this should be done at sc->enable function */
bus_space_write_4(sasc->sc_iot, sasc->sc_gpioh,
SAGPIO_PCR, 0xa0000);
bus_space_write_4(sasc->sc_iot, sasc->sc_gpioh,
SAGPIO_PSR, 0x100);
}
/* Initialization for serial console */
int
sacominit(bus_space_tag_t iot, bus_addr_t iobase, int baud, tcflag_t cflag,
bus_space_handle_t *iohp)
{
int brd, cr0;
if (bus_space_map(iot, iobase, SACOM_NPORTS, 0, iohp))
aprint_normal("register map failed\n");
/* wait for the Tx queue to drain and disable the UART */
while (bus_space_read_4(iot, *iohp, SACOM_SR1) & SR1_TBY)
continue;
bus_space_write_4(iot, *iohp, SACOM_CR3, 0);
cr0 = cflag2cr0(cflag);
bus_space_write_4(iot, *iohp, SACOM_CR0, cr0);
brd = SACOMSPEED(baud);
sacomconsrate = baud;
sacomconsaddr = iobase;
sacomconscflag = cflag;
/* XXX assumes little endian */
bus_space_write_4(iot, *iohp, SACOM_CR1, brd >> 8);
bus_space_write_4(iot, *iohp, SACOM_CR2, brd & 0xff);
/* enable the UART */
bus_space_write_4(iot, *iohp, SACOM_CR3, CR3_RXE | CR3_TXE);
return 0;
}
void
sacomcnprobe(struct consdev *cp)
{
cp->cn_pri = CN_REMOTE;
}
void
sacomcninit(struct consdev *cp)
{
if (cp == NULL) {
/* XXX cp == NULL means that MMU is disabled. */
sacomconsioh = SACOM3_BASE;
sacomconstag = &sa11x0_bs_tag;
cn_tab = &sacomcons;
return;
}
if (sacominit(&sa11x0_bs_tag, CONADDR, CONSPEED,
CONMODE, &sacomconsioh))
panic("can't init serial console @%x", CONADDR);
cn_tab = &sacomcons;
sacomconstag = &sa11x0_bs_tag;
}
int
sacomcngetc(dev_t dev)
{
int c, s;
s = spltty(); /* XXX do we need this? */
while (!(bus_space_read_4(sacomconstag, sacomconsioh, SACOM_SR1)
& SR1_RNE)) {
#if defined(DDB) || defined(KGDB)
#ifndef DDB_BREAK_CHAR
u_int sr0;
extern int db_active;
sr0 = bus_space_read_4(sacomconstag, sacomconsioh, SACOM_SR0);
if (ISSET(sr0, SR0_RBB))
bus_space_write_4(sacomconstag, sacomconsioh,
SACOM_SR0, SR0_RBB);
if (ISSET(sr0, SR0_REB)) {
bus_space_write_4(sacomconstag, sacomconsioh,
SACOM_SR0, SR0_REB);
if (db_active == 0)
console_debugger();
}
#endif
#endif /* DDB || KGDB */
}
c = bus_space_read_4(sacomconstag, sacomconsioh, SACOM_DR);
c &= 0xff;
splx(s);
return c;
}
void
sacomcnputc(dev_t dev, int c)
{
int s;
s = spltty(); /* XXX do we need this? */
while (!(bus_space_read_4(sacomconstag, sacomconsioh, SACOM_SR1)
& SR1_TNF))
continue;
bus_space_write_4(sacomconstag, sacomconsioh, SACOM_DR, c);
splx(s);
}
void
sacomcnpollc(dev_t dev, int on)
{
}
#if 0
#ifdef DEBUG
int
sacomcncharpoll(void)
{
int c;
if (!(bus_space_read_4(sacomconstag, sacomconsioh, SACOM_SR1)
& SR1_RNE))
return -1;
c = bus_space_read_4(sacomconstag, sacomconsioh, SACOM_DR);
c &= 0xff;
return c;
}
#endif
#endif
/* helper function to identify the com ports used by
console or KGDB (and not yet autoconf attached) */
int
sacom_is_console(bus_space_tag_t iot, bus_addr_t iobase,
bus_space_handle_t *ioh)
{
bus_space_handle_t help;
if (!sacomconsattached &&
iot == sacomconstag && iobase == sacomconsaddr)
help = sacomconsioh;
else
return 0;
if (ioh)
*ioh = help;
return 1;
}
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