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NetBSD/sys/arch/arm/ep93xx/epcom.c

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/* $NetBSD: epcom.c,v 1.21 2011/07/01 19:31:17 dyoung Exp $ */
/*
* Copyright (c) 1998, 1999, 2001, 2002, 2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jesse Off
*
* 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
*/
/*
* TODO: hardware flow control
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: epcom.c,v 1.21 2011/07/01 19:31:17 dyoung Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "epcom.h"
#include "rnd.h"
#if NRND > 0 && defined(RND_COM)
#include <sys/rnd.h>
#endif
/*
* Override cnmagic(9) macro before including <sys/systm.h>.
* We need to know if cn_check_magic triggered debugger, so set a flag.
* Callers of cn_check_magic must declare int cn_trapped = 0;
* XXX: this is *ugly*!
*/
#define cn_trap() \
do { \
console_debugger(); \
cn_trapped = 1; \
} while (/* CONSTCOND */ 0)
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/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 <machine/intr.h>
#include <sys/bus.h>
#include <arm/ep93xx/epcomreg.h>
#include <arm/ep93xx/epcomvar.h>
#include <arm/ep93xx/ep93xxreg.h>
#include <arm/ep93xx/ep93xxvar.h>
#include <dev/cons.h>
static int epcomparam(struct tty *, struct termios *);
static void epcomstart(struct tty *);
static int epcomhwiflow(struct tty *, int);
static u_int cflag2lcrhi(tcflag_t);
static void epcom_iflush(struct epcom_softc *);
static void epcom_set(struct epcom_softc *);
int epcomcngetc(dev_t);
void epcomcnputc(dev_t, int);
void epcomcnpollc(dev_t, int);
static void epcomsoft(void* arg);
inline static void epcom_txsoft(struct epcom_softc *, struct tty *);
inline static void epcom_rxsoft(struct epcom_softc *, struct tty *);
void epcomcnprobe(struct consdev *);
void epcomcninit(struct consdev *);
static struct epcom_cons_softc {
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
bus_addr_t sc_hwbase;
int sc_ospeed;
tcflag_t sc_cflag;
int sc_attached;
} epcomcn_sc;
static struct cnm_state epcom_cnm_state;
extern struct cfdriver epcom_cd;
dev_type_open(epcomopen);
dev_type_close(epcomclose);
dev_type_read(epcomread);
dev_type_write(epcomwrite);
dev_type_ioctl(epcomioctl);
dev_type_stop(epcomstop);
dev_type_tty(epcomtty);
dev_type_poll(epcompoll);
const struct cdevsw epcom_cdevsw = {
epcomopen, epcomclose, epcomread, epcomwrite, epcomioctl,
epcomstop, epcomtty, epcompoll, nommap, ttykqfilter, D_TTY
};
struct consdev epcomcons = {
NULL, NULL, epcomcngetc, epcomcnputc, epcomcnpollc, NULL,
NULL, NULL, NODEV, CN_NORMAL
};
#ifndef DEFAULT_COMSPEED
#define DEFAULT_COMSPEED 115200
#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))
void
epcom_attach_subr(struct epcom_softc *sc)
{
struct tty *tp;
if (sc->sc_iot == epcomcn_sc.sc_iot
&& sc->sc_hwbase == epcomcn_sc.sc_hwbase) {
epcomcn_sc.sc_attached = 1;
sc->sc_lcrlo = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) & 0xff;
sc->sc_lcrmid = EPCOMSPEED2BRD(epcomcn_sc.sc_ospeed) >> 8;
/* 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 = epcomstart;
tp->t_param = epcomparam;
tp->t_hwiflow = epcomhwiflow;
sc->sc_tty = tp;
sc->sc_rbuf = malloc(EPCOM_RING_SIZE << 1, M_DEVBUF, M_NOWAIT);
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = EPCOM_RING_SIZE;
if (sc->sc_rbuf == NULL) {
printf("%s: unable to allocate ring buffer\n",
sc->sc_dev.dv_xname);
return;
}
sc->sc_ebuf = sc->sc_rbuf + (EPCOM_RING_SIZE << 1);
sc->sc_tbc = 0;
sc->sc_lcrlo = EPCOMSPEED2BRD(DEFAULT_COMSPEED) & 0xff;
sc->sc_lcrmid = EPCOMSPEED2BRD(DEFAULT_COMSPEED) >> 8;
sc->sc_lcrhi = cflag2lcrhi(CS8); /* 8N1 */
tty_attach(tp);
if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) {
int maj;
/* locate the major number */
maj = cdevsw_lookup_major(&epcom_cdevsw);
cn_tab->cn_dev = makedev(maj, device_unit(&sc->sc_dev));
aprint_normal("%s: console\n", sc->sc_dev.dv_xname);
}
sc->sc_si = softint_establish(SOFTINT_SERIAL, epcomsoft, sc);
#if NRND > 0 && defined(RND_COM)
rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname,
RND_TYPE_TTY, 0);
#endif
/* if there are no enable/disable functions, assume the device
is always enabled */
if (!sc->enable)
sc->enabled = 1;
/* XXX configure register */
/* xxx_config(sc) */
SET(sc->sc_hwflags, COM_HW_DEV_OK);
}
static int
epcomparam(struct tty *tp, struct termios *t)
{
struct epcom_softc *sc
= device_lookup_private(&epcom_cd, COMUNIT(tp->t_dev));
int s;
if (COM_ISALIVE(sc) == 0)
return (EIO);
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);
s = splserial();
sc->sc_lcrhi = cflag2lcrhi(t->c_cflag);
sc->sc_lcrlo = EPCOMSPEED2BRD(t->c_ospeed) & 0xff;
sc->sc_lcrmid = EPCOMSPEED2BRD(t->c_ospeed) >> 8;
/* And copy to tty. */
tp->t_ispeed = 0;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = t->c_cflag;
epcom_set(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;
epcomstart(tp);
}
}
return (0);
}
static int
epcomhwiflow(struct tty *tp, int block)
{
return (0);
}
static void
epcom_filltx(struct epcom_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, EPCOM_Flag) & Flag_TXFF) == 0) {
if (n >= sc->sc_tbc)
break;
bus_space_write_4(iot, ioh, EPCOM_Data,
0xff & *(sc->sc_tba + n));
n++;
}
sc->sc_tbc -= n;
sc->sc_tba += n;
}
static void
epcomstart(struct tty *tp)
{
struct epcom_softc *sc
= device_lookup_private(&epcom_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();
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. */
epcom_filltx(sc);
if (!ISSET(sc->sc_ctrl, Ctrl_TIE)) {
SET(sc->sc_ctrl, Ctrl_TIE);
epcom_set(sc);
}
out:
splx(s);
return;
}
static void
epcom_break(struct epcom_softc *sc, int onoff)
{
if (onoff)
SET(sc->sc_lcrhi, LinCtrlHigh_BRK);
else
CLR(sc->sc_lcrhi, LinCtrlHigh_BRK);
epcom_set(sc);
}
static void
epcom_shutdown(struct epcom_softc *sc)
{
int s;
s = splserial();
/* Turn off interrupts. */
CLR(sc->sc_ctrl, (Ctrl_TIE|Ctrl_RTIE|Ctrl_RIE));
/* Clear any break condition set with TIOCSBRK. */
epcom_break(sc, 0);
epcom_set(sc);
if (sc->disable) {
#ifdef DIAGNOSTIC
if (!sc->enabled)
panic("epcom_shutdown: not enabled?");
#endif
(*sc->disable)(sc);
sc->enabled = 0;
}
splx(s);
}
int
epcomopen(dev_t dev, int flag, int mode, struct lwp *l)
{
struct epcom_softc *sc;
struct tty *tp;
int s, s2;
int error;
sc = device_lookup_private(&epcom_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();
if (sc->enable) {
if ((*sc->enable)(sc)) {
splx(s2);
splx(s);
printf("%s: device enable failed\n",
sc->sc_dev.dv_xname);
return (EIO);
}
sc->enabled = 1;
#if 0
/* XXXXXXXXXXXXXXX */
com_config(sc);
#endif
}
/* Turn on interrupts. */
SET(sc->sc_ctrl, (Ctrl_UARTE|Ctrl_RIE|Ctrl_RTIE));
epcom_set(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
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 = epcomcn_sc.sc_ospeed;
t.c_cflag = epcomcn_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 epcomparam() will do something. */
tp->t_ospeed = 0;
(void) epcomparam(tp, &t);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
ttychars(tp);
ttsetwater(tp);
s2 = splserial();
/* Clear the input ring, and unblock. */
sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf;
sc->sc_rbavail = EPCOM_RING_SIZE;
epcom_iflush(sc);
CLR(sc->sc_rx_flags, RX_ANY_BLOCK);
#ifdef COM_DEBUG
if (epcom_debug)
comstatus(sc, "epcomopen ");
#endif
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.
*/
epcom_shutdown(sc);
}
return (error);
}
int
epcomclose(dev_t dev, int flag, int mode, struct lwp *l)
{
struct epcom_softc *sc = device_lookup_private(&epcom_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.
*/
epcom_shutdown(sc);
}
return (0);
}
int
epcomread(dev_t dev, struct uio *uio, int flag)
{
struct epcom_softc *sc = device_lookup_private(&epcom_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
epcomwrite(dev_t dev, struct uio *uio, int flag)
{
struct epcom_softc *sc = device_lookup_private(&epcom_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
epcompoll(dev_t dev, int events, struct lwp *l)
{
struct epcom_softc *sc = device_lookup_private(&epcom_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 *
epcomtty(dev_t dev)
{
struct epcom_softc *sc = device_lookup_private(&epcom_cd, COMUNIT(dev));
struct tty *tp = sc->sc_tty;
return (tp);
}
int
epcomioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct epcom_softc *sc = device_lookup_private(&epcom_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();
switch (cmd) {
case TIOCSBRK:
epcom_break(sc, 1);
break;
case TIOCCBRK:
epcom_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;
}
splx(s);
return (error);
}
/*
* Stop output on a line.
*/
void
epcomstop(struct tty *tp, int flag)
{
struct epcom_softc *sc
= device_lookup_private(&epcom_cd, COMUNIT(tp->t_dev));
int s;
s = splserial();
if (ISSET(tp->t_state, TS_BUSY)) {
/* Stop transmitting at the next chunk. */
sc->sc_tbc = 0;
if (!ISSET(tp->t_state, TS_TTSTOP))
SET(tp->t_state, TS_FLUSH);
}
splx(s);
}
static u_int
cflag2lcrhi(tcflag_t cflag)
{
u_int lcrhi;
switch (cflag & CSIZE) {
case CS7:
lcrhi = 0x40;
break;
case CS6:
lcrhi = 0x20;
break;
case CS8:
default:
lcrhi = 0x60;
break;
}
lcrhi |= (cflag & PARENB) ? LinCtrlHigh_PEN : 0;
lcrhi |= (cflag & PARODD) ? 0 : LinCtrlHigh_EPS;
lcrhi |= (cflag & CSTOPB) ? LinCtrlHigh_STP2 : 0;
lcrhi |= LinCtrlHigh_FEN; /* FIFO always enabled */
return (lcrhi);
}
static void
epcom_iflush(struct epcom_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 ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) == 0
&& --timo)
#ifdef DIAGNOSTIC
reg =
#else
(void)
#endif
bus_space_read_4(iot, ioh, EPCOM_Data);
#ifdef DIAGNOSTIC
if (!timo)
printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname,
reg);
#endif
}
static void
epcom_set(struct epcom_softc *sc)
{
bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlLow,
sc->sc_lcrlo);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlMid,
sc->sc_lcrmid);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_LinCtrlHigh,
sc->sc_lcrhi);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, EPCOM_Ctrl,
sc->sc_ctrl);
}
int
epcomcnattach(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t ioh,
int ospeed, tcflag_t cflag)
{
u_int lcrlo, lcrmid, lcrhi, ctrl, pwrcnt;
bus_space_handle_t syscon_ioh;
cn_tab = &epcomcons;
cn_init_magic(&epcom_cnm_state);
cn_set_magic("\047\001");
epcomcn_sc.sc_iot = iot;
epcomcn_sc.sc_ioh = ioh;
epcomcn_sc.sc_hwbase = iobase;
epcomcn_sc.sc_ospeed = ospeed;
epcomcn_sc.sc_cflag = cflag;
lcrhi = cflag2lcrhi(cflag);
lcrlo = EPCOMSPEED2BRD(ospeed) & 0xff;
lcrmid = EPCOMSPEED2BRD(ospeed) >> 8;
ctrl = Ctrl_UARTE;
bus_space_map(iot, EP93XX_APB_HWBASE + EP93XX_APB_SYSCON,
EP93XX_APB_SYSCON_SIZE, 0, &syscon_ioh);
pwrcnt = bus_space_read_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt);
pwrcnt &= ~(PwrCnt_UARTBAUD);
bus_space_write_4(iot, syscon_ioh, EP93XX_SYSCON_PwrCnt, pwrcnt);
bus_space_unmap(iot, syscon_ioh, EP93XX_APB_SYSCON_SIZE);
bus_space_write_4(iot, ioh, EPCOM_LinCtrlLow, lcrlo);
bus_space_write_4(iot, ioh, EPCOM_LinCtrlMid, lcrmid);
bus_space_write_4(iot, ioh, EPCOM_LinCtrlHigh, lcrhi);
bus_space_write_4(iot, ioh, EPCOM_Ctrl, ctrl);
return (0);
}
void
epcomcnprobe(struct consdev *cp)
{
cp->cn_pri = CN_REMOTE;
}
void
epcomcnpollc(dev_t dev, int on)
{
}
void
epcomcnputc(dev_t dev, int c)
{
int s;
bus_space_tag_t iot = epcomcn_sc.sc_iot;
bus_space_handle_t ioh = epcomcn_sc.sc_ioh;
s = splserial();
while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFF) != 0)
;
bus_space_write_4(iot, ioh, EPCOM_Data, c);
#ifdef DEBUG
if (c == '\r') {
while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_TXFE) == 0)
;
}
#endif
splx(s);
}
int
epcomcngetc(dev_t dev)
{
int c, sts;
int s;
bus_space_tag_t iot = epcomcn_sc.sc_iot;
bus_space_handle_t ioh = epcomcn_sc.sc_ioh;
s = splserial();
while((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) != 0)
;
c = bus_space_read_4(iot, ioh, EPCOM_Data);
sts = bus_space_read_4(iot, ioh, EPCOM_RXSts);
if (ISSET(sts, RXSts_BE)) c = CNC_BREAK;
#ifdef DDB
extern int db_active;
if (!db_active)
#endif
{
int cn_trapped = 0; /* unused */
cn_check_magic(dev, c, epcom_cnm_state);
}
c &= 0xff;
splx(s);
return (c);
}
inline static void
epcom_txsoft(struct epcom_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
epcom_rxsoft(struct epcom_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 sts;
int code;
int s;
end = sc->sc_ebuf;
get = sc->sc_rbget;
scc = cc = EPCOM_RING_SIZE - sc->sc_rbavail;
#if 0
if (cc == EPCOM_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];
sts = get[1];
if (ISSET(sts, RXSts_OE | RXSts_FE | RXSts_PE | RXSts_BE)) {
#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(sts, (RXSts_FE|RXSts_BE)))
SET(code, TTY_FE);
if (ISSET(sts, RXSts_PE))
SET(code, TTY_PE);
}
if ((*rint)(code, tp) == -1) {
/*
* The line discipline's buffer is out of space.
*/
if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) {
/*
* We're either not using flow control, or the
* line discipline didn't tell us to block for
* some reason. Either way, we have no way to
* know when there's more space available, so
* just drop the rest of the data.
*/
get += cc << 1;
if (get >= end)
get -= EPCOM_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();
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_ctrl, (Ctrl_RIE|Ctrl_RTIE));
epcom_set(sc);
}
if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) {
CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED);
#if 0
com_hwiflow(sc);
#endif
}
}
splx(s);
}
}
static void
epcomsoft(void* arg)
{
struct epcom_softc *sc = arg;
if (COM_ISALIVE(sc) == 0)
return;
if (sc->sc_rx_ready) {
sc->sc_rx_ready = 0;
epcom_rxsoft(sc, sc->sc_tty);
}
if (sc->sc_tx_done) {
sc->sc_tx_done = 0;
epcom_txsoft(sc, sc->sc_tty);
}
}
int
epcomintr(void* arg)
{
struct epcom_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 flagr;
u_int intr;
u_int32_t c, csts;
intr = bus_space_read_4(iot, ioh, EPCOM_IntIDIntClr);
if (COM_ISALIVE(sc) == 0)
panic("intr on disabled epcom");
flagr = bus_space_read_4(iot, ioh, EPCOM_Flag);
end = sc->sc_ebuf;
put = sc->sc_rbput;
cc = sc->sc_rbavail;
if (!(ISSET(flagr, Flag_RXFE))) {
if (!ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) {
while (cc > 0) {
if (ISSET(flagr, Flag_RXFE))
break;
c = bus_space_read_4(iot, ioh, EPCOM_Data);
csts = bus_space_read_4(iot, ioh, EPCOM_RXSts);
if (ISSET(csts, RXSts_BE)) {
int cn_trapped = 0;
cn_check_magic(sc->sc_tty->t_dev,
CNC_BREAK, epcom_cnm_state);
if (cn_trapped)
goto next;
#if defined(KGDB) && !defined(DDB)
if (ISSET(sc->sc_hwflags, COM_HW_KGDB)){
kgdb_connect(1);
goto next;
}
#endif
} else {
int cn_trapped = 0;
cn_check_magic(sc->sc_tty->t_dev,
(c & 0xff), epcom_cnm_state);
if (cn_trapped)
goto next;
}
put[0] = c & 0xff;
put[1] = csts & 0xf;
put += 2;
if (put >= end)
put = sc->sc_rbuf;
cc--;
next:
flagr = bus_space_read_4(iot, ioh, EPCOM_Flag);
}
/*
* 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 epcom 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_ctrl, (Ctrl_RIE|Ctrl_RTIE));
epcom_set(sc);
}
} else {
#ifdef DIAGNOSTIC
panic("epcomintr: we shouldn't reach here");
#endif
CLR(sc->sc_ctrl, (Ctrl_RIE|Ctrl_RTIE));
epcom_set(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.
*/
if (!ISSET(flagr, Flag_TXFF) && sc->sc_tbc > 0) {
/* Output the next chunk of the contiguous buffer, if any. */
epcom_filltx(sc);
} else {
/* Disable transmit completion interrupts if necessary. */
if (ISSET(sc->sc_ctrl, Ctrl_TIE)) {
CLR(sc->sc_ctrl, Ctrl_TIE);
epcom_set(sc);
}
if (sc->sc_tx_busy) {
sc->sc_tx_busy = 0;
sc->sc_tx_done = 1;
}
}
/* Wake up the poller. */
softint_schedule(sc->sc_si);
#if 0 /* XXX: broken */
#if NRND > 0 && defined(RND_COM)
rnd_add_uint32(&sc->rnd_source, intr ^ flagr);
#endif
#endif
return (1);
}
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