ofw_console.c revision 119418 
1/*
2 * Copyright (C) 2001 Benno Rice.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: head/sys/dev/ofw/ofw_console.c 119418 2003-08-24 17:55:58Z obrien $");
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/dev/ofw/ofw_console.c 119418 2003-08-24 17:55:58Z obrien $");
31
32#include "opt_ddb.h"
33#include "opt_comconsole.h"
34
35#include <sys/param.h>
36#include <sys/kernel.h>
37#include <sys/systm.h>
38#include <sys/types.h>
39#include <sys/conf.h>
40#include <sys/cons.h>
41#include <sys/consio.h>
42#include <sys/tty.h>
43
44#include <dev/ofw/openfirm.h>
45
46#include <ddb/ddb.h>
47
48#define	OFW_POLL_HZ	4
49
50static d_open_t		ofw_dev_open;
51static d_close_t	ofw_dev_close;
52static d_ioctl_t	ofw_dev_ioctl;
53
54#define	CDEV_MAJOR	97
55
56static struct cdevsw ofw_cdevsw = {
57	.d_open =	ofw_dev_open,
58	.d_close =	ofw_dev_close,
59	.d_read =	ttyread,
60	.d_write =	ttywrite,
61	.d_ioctl =	ofw_dev_ioctl,
62	.d_poll =	ttypoll,
63	.d_name =	"ofw",
64	.d_maj =	CDEV_MAJOR,
65};
66
67static struct tty		*ofw_tp = NULL;
68static int			polltime;
69static struct callout_handle	ofw_timeouthandle
70    = CALLOUT_HANDLE_INITIALIZER(&ofw_timeouthandle);
71
72#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
73static int			alt_break_state;
74#endif
75
76static void	ofw_tty_start(struct tty *);
77static int	ofw_tty_param(struct tty *, struct termios *);
78static void	ofw_tty_stop(struct tty *, int);
79static void	ofw_timeout(void *);
80
81static cn_probe_t	ofw_cons_probe;
82static cn_init_t	ofw_cons_init;
83static cn_getc_t	ofw_cons_getc;
84static cn_checkc_t 	ofw_cons_checkc;
85static cn_putc_t	ofw_cons_putc;
86
87CONS_DRIVER(ofw, ofw_cons_probe, ofw_cons_init, NULL, ofw_cons_getc,
88    ofw_cons_checkc, ofw_cons_putc, NULL);
89
90static void
91cn_drvinit(void *unused)
92{
93	phandle_t options;
94	char output[32];
95
96	if (ofw_consdev.cn_dev != NULL) {
97		if ((options = OF_finddevice("/options")) == -1 ||
98		    OF_getprop(options, "output-device", output,
99		    sizeof(output)) == -1)
100			return;
101		make_dev(&ofw_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "%s",
102		    output);
103		make_dev_alias(ofw_consdev.cn_dev, "ofwcons");
104	}
105}
106
107SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE + CDEV_MAJOR, cn_drvinit, NULL)
108
109static int	stdin;
110static int	stdout;
111
112static int
113ofw_dev_open(dev_t dev, int flag, int mode, struct thread *td)
114{
115	struct	tty *tp;
116	int	unit;
117	int	error, setuptimeout;
118
119	error = 0;
120	setuptimeout = 0;
121	unit = minor(dev);
122
123	tp = ofw_tp = dev->si_tty = ttymalloc(ofw_tp);
124
125	tp->t_oproc = ofw_tty_start;
126	tp->t_param = ofw_tty_param;
127	tp->t_stop = ofw_tty_stop;
128	tp->t_dev = dev;
129
130	if ((tp->t_state & TS_ISOPEN) == 0) {
131		tp->t_state |= TS_CARR_ON;
132		ttychars(tp);
133		tp->t_iflag = TTYDEF_IFLAG;
134		tp->t_oflag = TTYDEF_OFLAG;
135		tp->t_cflag = TTYDEF_CFLAG|CLOCAL;
136		tp->t_lflag = TTYDEF_LFLAG;
137		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
138		ttsetwater(tp);
139
140		setuptimeout = 1;
141	} else if ((tp->t_state & TS_XCLUDE) && suser(td)) {
142		return (EBUSY);
143	}
144
145	error = (*linesw[tp->t_line].l_open)(dev, tp);
146
147	if (error == 0 && setuptimeout) {
148		polltime = hz / OFW_POLL_HZ;
149		if (polltime < 1) {
150			polltime = 1;
151		}
152
153		ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
154	}
155
156	return (error);
157}
158
159static int
160ofw_dev_close(dev_t dev, int flag, int mode, struct thread *td)
161{
162	int	unit;
163	struct	tty *tp;
164
165	unit = minor(dev);
166	tp = ofw_tp;
167
168	if (unit != 0) {
169		return (ENXIO);
170	}
171
172	(*linesw[tp->t_line].l_close)(tp, flag);
173	ttyclose(tp);
174
175	return (0);
176}
177
178static int
179ofw_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
180{
181	int	unit;
182	struct	tty *tp;
183	int	error;
184
185	unit = minor(dev);
186	tp = ofw_tp;
187
188	if (unit != 0) {
189		return (ENXIO);
190	}
191
192	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
193	if (error != ENOIOCTL) {
194		return (error);
195	}
196
197	error = ttioctl(tp, cmd, data, flag);
198	if (error != ENOIOCTL) {
199		return (error);
200	}
201
202	return (ENOTTY);
203}
204
205static int
206ofw_tty_param(struct tty *tp, struct termios *t)
207{
208
209	return (0);
210}
211
212static void
213ofw_tty_start(struct tty *tp)
214{
215
216	if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
217		ttwwakeup(tp);
218		return;
219	}
220
221	tp->t_state |= TS_BUSY;
222	while (tp->t_outq.c_cc != 0) {
223		ofw_cons_putc(NULL, getc(&tp->t_outq));
224	}
225	tp->t_state &= ~TS_BUSY;
226
227	ttwwakeup(tp);
228}
229
230static void
231ofw_tty_stop(struct tty *tp, int flag)
232{
233
234	if (tp->t_state & TS_BUSY) {
235		if ((tp->t_state & TS_TTSTOP) == 0) {
236			tp->t_state |= TS_FLUSH;
237		}
238	}
239}
240
241static void
242ofw_timeout(void *v)
243{
244	struct	tty *tp;
245	int 	c;
246
247	tp = (struct tty *)v;
248
249	while ((c = ofw_cons_checkc(NULL)) != -1) {
250		if (tp->t_state & TS_ISOPEN) {
251			(*linesw[tp->t_line].l_rint)(c, tp);
252		}
253	}
254
255	ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
256}
257
258static void
259ofw_cons_probe(struct consdev *cp)
260{
261	int chosen;
262
263	if ((chosen = OF_finddevice("/chosen")) == -1) {
264		cp->cn_pri = CN_DEAD;
265		return;
266	}
267
268	if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) {
269		cp->cn_pri = CN_DEAD;
270		return;
271	}
272
273	if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) {
274		cp->cn_pri = CN_DEAD;
275		return;
276	}
277
278	cp->cn_dev = NULL;
279	cp->cn_pri = CN_INTERNAL;
280}
281
282static void
283ofw_cons_init(struct consdev *cp)
284{
285
286	cp->cn_dev = makedev(CDEV_MAJOR, 0);
287	cp->cn_tp = ofw_tp;
288}
289
290static int
291ofw_cons_getc(struct consdev *cp)
292{
293	unsigned char ch;
294	int l;
295
296	ch = '\0';
297
298	while ((l = OF_read(stdin, &ch, 1)) != 1) {
299		if (l != -2 && l != 0) {
300			return (-1);
301		}
302	}
303
304#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
305	if (db_alt_break(ch, &alt_break_state))
306		breakpoint();
307#endif
308
309	return (ch);
310}
311
312static int
313ofw_cons_checkc(struct consdev *cp)
314{
315	unsigned char ch;
316
317	if (OF_read(stdin, &ch, 1) > 0) {
318#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
319		if (db_alt_break(ch, &alt_break_state))
320			breakpoint();
321#endif
322		return (ch);
323	}
324
325	return (-1);
326}
327
328static void
329ofw_cons_putc(struct consdev *cp, int c)
330{
331	char cbuf;
332
333	if (c == '\n') {
334		cbuf = '\r';
335		OF_write(stdout, &cbuf, 1);
336	}
337
338	cbuf = c;
339	OF_write(stdout, &cbuf, 1);
340}
341