304 lines
6.3 KiB
C
304 lines
6.3 KiB
C
/*-
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* Copyright (C) 2001 Benno Rice.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_comconsole.h"
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#include "opt_ofw.h"
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#include <sys/param.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/types.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/consio.h>
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#include <sys/tty.h>
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#include <dev/ofw/openfirm.h>
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#include <ddb/ddb.h>
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#ifndef OFWCONS_POLL_HZ
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#define OFWCONS_POLL_HZ 4 /* 50-100 works best on Ultra2 */
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#endif
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#define OFBURSTLEN 128 /* max number of bytes to write in one chunk */
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static d_open_t ofw_dev_open;
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static d_close_t ofw_dev_close;
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static struct cdevsw ofw_cdevsw = {
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.d_version = D_VERSION,
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.d_open = ofw_dev_open,
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.d_close = ofw_dev_close,
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.d_name = "ofw",
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.d_flags = D_TTY | D_NEEDGIANT,
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};
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static struct tty *ofw_tp = NULL;
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static int polltime;
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static struct callout_handle ofw_timeouthandle
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= CALLOUT_HANDLE_INITIALIZER(&ofw_timeouthandle);
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#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
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static int alt_break_state;
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#endif
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static void ofw_tty_start(struct tty *);
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static int ofw_tty_param(struct tty *, struct termios *);
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static void ofw_tty_stop(struct tty *, int);
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static void ofw_timeout(void *);
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static cn_probe_t ofw_cnprobe;
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static cn_init_t ofw_cninit;
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static cn_term_t ofw_cnterm;
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static cn_getc_t ofw_cngetc;
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static cn_putc_t ofw_cnputc;
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CONSOLE_DRIVER(ofw);
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static void
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cn_drvinit(void *unused)
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{
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phandle_t options;
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char output[32];
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struct cdev *dev;
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if (ofw_consdev.cn_pri != CN_DEAD &&
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ofw_consdev.cn_name[0] != '\0') {
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if ((options = OF_finddevice("/options")) == -1 ||
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OF_getprop(options, "output-device", output,
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sizeof(output)) == -1)
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return;
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/*
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* XXX: This is a hack and it may result in two /dev/ttya
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* XXX: devices on platforms where the sab driver works.
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*/
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dev = make_dev(&ofw_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "%s",
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output);
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make_dev_alias(dev, "ofwcons");
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}
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}
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SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL)
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static int stdin;
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static int stdout;
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static int
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ofw_dev_open(struct cdev *dev, int flag, int mode, struct thread *td)
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{
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struct tty *tp;
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int unit;
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int error, setuptimeout;
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error = 0;
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setuptimeout = 0;
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unit = minor(dev);
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/*
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* XXX: BAD, should happen at attach time
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*/
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if (dev->si_tty == NULL) {
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ofw_tp = ttyalloc();
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dev->si_tty = ofw_tp;
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ofw_tp->t_dev = dev;
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}
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tp = dev->si_tty;
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tp->t_oproc = ofw_tty_start;
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tp->t_param = ofw_tty_param;
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tp->t_stop = ofw_tty_stop;
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tp->t_dev = dev;
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if ((tp->t_state & TS_ISOPEN) == 0) {
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tp->t_state |= TS_CARR_ON;
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ttyconsolemode(tp, 0);
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setuptimeout = 1;
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} else if ((tp->t_state & TS_XCLUDE) && suser(td)) {
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return (EBUSY);
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}
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error = ttyld_open(tp, dev);
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if (error == 0 && setuptimeout) {
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polltime = hz / OFWCONS_POLL_HZ;
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if (polltime < 1) {
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polltime = 1;
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}
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ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
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}
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return (error);
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}
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static int
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ofw_dev_close(struct cdev *dev, int flag, int mode, struct thread *td)
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{
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int unit;
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struct tty *tp;
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unit = minor(dev);
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tp = dev->si_tty;
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if (unit != 0) {
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return (ENXIO);
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}
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/* XXX Should be replaced with callout_stop(9) */
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untimeout(ofw_timeout, tp, ofw_timeouthandle);
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ttyld_close(tp, flag);
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tty_close(tp);
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return (0);
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}
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static int
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ofw_tty_param(struct tty *tp, struct termios *t)
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{
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return (0);
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}
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static void
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ofw_tty_start(struct tty *tp)
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{
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struct clist *cl;
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int len;
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u_char buf[OFBURSTLEN];
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if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP))
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return;
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tp->t_state |= TS_BUSY;
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cl = &tp->t_outq;
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len = q_to_b(cl, buf, OFBURSTLEN);
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OF_write(stdout, buf, len);
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tp->t_state &= ~TS_BUSY;
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ttwwakeup(tp);
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}
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static void
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ofw_tty_stop(struct tty *tp, int flag)
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{
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if (tp->t_state & TS_BUSY) {
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if ((tp->t_state & TS_TTSTOP) == 0) {
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tp->t_state |= TS_FLUSH;
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}
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}
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}
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static void
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ofw_timeout(void *v)
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{
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struct tty *tp;
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int c;
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tp = (struct tty *)v;
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while ((c = ofw_cngetc(NULL)) != -1) {
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if (tp->t_state & TS_ISOPEN) {
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ttyld_rint(tp, c);
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}
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}
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ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
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}
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static void
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ofw_cnprobe(struct consdev *cp)
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{
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int chosen;
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if ((chosen = OF_finddevice("/chosen")) == -1) {
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cp->cn_pri = CN_DEAD;
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return;
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}
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if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) {
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cp->cn_pri = CN_DEAD;
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return;
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}
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if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) {
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cp->cn_pri = CN_DEAD;
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return;
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}
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cp->cn_pri = CN_LOW;
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}
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static void
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ofw_cninit(struct consdev *cp)
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{
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/* XXX: This is the alias, but that should be good enough */
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sprintf(cp->cn_name, "ofwcons");
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cp->cn_tp = ofw_tp;
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}
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static void
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ofw_cnterm(struct consdev *cp)
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{
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}
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static int
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ofw_cngetc(struct consdev *cp)
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{
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unsigned char ch;
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if (OF_read(stdin, &ch, 1) > 0) {
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#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
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if (kdb_alt_break(ch, &alt_break_state))
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kdb_enter("Break sequence on console");
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#endif
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return (ch);
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}
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return (-1);
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}
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static void
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ofw_cnputc(struct consdev *cp, int c)
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{
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char cbuf;
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if (c == '\n') {
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cbuf = '\r';
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OF_write(stdout, &cbuf, 1);
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}
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cbuf = c;
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OF_write(stdout, &cbuf, 1);
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}
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