ofw_console.c revision 111815 
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#ifndef lint
27static const char rcsid[] =
28  "$FreeBSD: head/sys/dev/ofw/ofw_console.c 111815 2003-03-03 12:15:54Z phk $";
29#endif /* not lint */
30
31#include "opt_ddb.h"
32#include "opt_comconsole.h"
33
34#include <sys/param.h>
35#include <sys/kernel.h>
36#include <sys/systm.h>
37#include <sys/types.h>
38#include <sys/conf.h>
39#include <sys/cons.h>
40#include <sys/consio.h>
41#include <sys/tty.h>
42
43#include <dev/ofw/openfirm.h>
44
45#include <ddb/ddb.h>
46
47#define	OFW_POLL_HZ	4
48
49static d_open_t		ofw_dev_open;
50static d_close_t	ofw_dev_close;
51static d_ioctl_t	ofw_dev_ioctl;
52
53#define	CDEV_MAJOR	97
54
55static struct cdevsw ofw_cdevsw = {
56	.d_open =	ofw_dev_open,
57	.d_close =	ofw_dev_close,
58	.d_read =	ttyread,
59	.d_write =	ttywrite,
60	.d_ioctl =	ofw_dev_ioctl,
61	.d_poll =	ttypoll,
62	.d_name =	"ofw",
63	.d_maj =	CDEV_MAJOR,
64};
65
66static struct tty		*ofw_tp = NULL;
67static int			polltime;
68static struct callout_handle	ofw_timeouthandle
69    = CALLOUT_HANDLE_INITIALIZER(&ofw_timeouthandle);
70
71#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
72static int			alt_break_state;
73#endif
74
75static void	ofw_tty_start(struct tty *);
76static int	ofw_tty_param(struct tty *, struct termios *);
77static void	ofw_tty_stop(struct tty *, int);
78static void	ofw_timeout(void *);
79
80static cn_probe_t	ofw_cons_probe;
81static cn_init_t	ofw_cons_init;
82static cn_getc_t	ofw_cons_getc;
83static cn_checkc_t 	ofw_cons_checkc;
84static cn_putc_t	ofw_cons_putc;
85
86CONS_DRIVER(ofw, ofw_cons_probe, ofw_cons_init, NULL, ofw_cons_getc,
87    ofw_cons_checkc, ofw_cons_putc, NULL);
88
89static void
90cn_drvinit(void *unused)
91{
92	phandle_t options;
93	char output[32];
94
95	if (ofw_consdev.cn_dev != NULL) {
96		if ((options = OF_finddevice("/options")) == -1 ||
97		    OF_getprop(options, "output-device", output,
98		    sizeof(output)) == -1)
99			return;
100		make_dev(&ofw_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "%s",
101		    output);
102		make_dev_alias(ofw_consdev.cn_dev, "ofwcons");
103	}
104}
105
106SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE + CDEV_MAJOR, cn_drvinit, NULL)
107
108static int	stdin;
109static int	stdout;
110
111static int
112ofw_dev_open(dev_t dev, int flag, int mode, struct thread *td)
113{
114	struct	tty *tp;
115	int	unit;
116	int	error, setuptimeout;
117
118	error = 0;
119	setuptimeout = 0;
120	unit = minor(dev);
121
122	tp = ofw_tp = dev->si_tty = ttymalloc(ofw_tp);
123
124	tp->t_oproc = ofw_tty_start;
125	tp->t_param = ofw_tty_param;
126	tp->t_stop = ofw_tty_stop;
127	tp->t_dev = dev;
128
129	if ((tp->t_state & TS_ISOPEN) == 0) {
130		tp->t_state |= TS_CARR_ON;
131		ttychars(tp);
132		tp->t_iflag = TTYDEF_IFLAG;
133		tp->t_oflag = TTYDEF_OFLAG;
134		tp->t_cflag = TTYDEF_CFLAG|CLOCAL;
135		tp->t_lflag = TTYDEF_LFLAG;
136		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
137		ttsetwater(tp);
138
139		setuptimeout = 1;
140	} else if ((tp->t_state & TS_XCLUDE) && suser(td)) {
141		return (EBUSY);
142	}
143
144	error = (*linesw[tp->t_line].l_open)(dev, tp);
145
146	if (error == 0 && setuptimeout) {
147		polltime = hz / OFW_POLL_HZ;
148		if (polltime < 1) {
149			polltime = 1;
150		}
151
152		ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
153	}
154
155	return (error);
156}
157
158static int
159ofw_dev_close(dev_t dev, int flag, int mode, struct thread *td)
160{
161	int	unit;
162	struct	tty *tp;
163
164	unit = minor(dev);
165	tp = ofw_tp;
166
167	if (unit != 0) {
168		return (ENXIO);
169	}
170
171	(*linesw[tp->t_line].l_close)(tp, flag);
172	ttyclose(tp);
173
174	return (0);
175}
176
177static int
178ofw_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
179{
180	int	unit;
181	struct	tty *tp;
182	int	error;
183
184	unit = minor(dev);
185	tp = ofw_tp;
186
187	if (unit != 0) {
188		return (ENXIO);
189	}
190
191	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
192	if (error != ENOIOCTL) {
193		return (error);
194	}
195
196	error = ttioctl(tp, cmd, data, flag);
197	if (error != ENOIOCTL) {
198		return (error);
199	}
200
201	return (ENOTTY);
202}
203
204static int
205ofw_tty_param(struct tty *tp, struct termios *t)
206{
207
208	return (0);
209}
210
211static void
212ofw_tty_start(struct tty *tp)
213{
214
215	if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
216		ttwwakeup(tp);
217		return;
218	}
219
220	tp->t_state |= TS_BUSY;
221	while (tp->t_outq.c_cc != 0) {
222		ofw_cons_putc(NULL, getc(&tp->t_outq));
223	}
224	tp->t_state &= ~TS_BUSY;
225
226	ttwwakeup(tp);
227}
228
229static void
230ofw_tty_stop(struct tty *tp, int flag)
231{
232
233	if (tp->t_state & TS_BUSY) {
234		if ((tp->t_state & TS_TTSTOP) == 0) {
235			tp->t_state |= TS_FLUSH;
236		}
237	}
238}
239
240static void
241ofw_timeout(void *v)
242{
243	struct	tty *tp;
244	int 	c;
245
246	tp = (struct tty *)v;
247
248	while ((c = ofw_cons_checkc(NULL)) != -1) {
249		if (tp->t_state & TS_ISOPEN) {
250			(*linesw[tp->t_line].l_rint)(c, tp);
251		}
252	}
253
254	ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
255}
256
257static void
258ofw_cons_probe(struct consdev *cp)
259{
260	int chosen;
261
262	if ((chosen = OF_finddevice("/chosen")) == -1) {
263		cp->cn_pri = CN_DEAD;
264		return;
265	}
266
267	if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) {
268		cp->cn_pri = CN_DEAD;
269		return;
270	}
271
272	if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) {
273		cp->cn_pri = CN_DEAD;
274		return;
275	}
276
277	cp->cn_dev = NULL;
278	cp->cn_pri = CN_INTERNAL;
279}
280
281static void
282ofw_cons_init(struct consdev *cp)
283{
284
285	cp->cn_dev = makedev(CDEV_MAJOR, 0);
286	cp->cn_tp = ofw_tp;
287}
288
289static int
290ofw_cons_getc(struct consdev *cp)
291{
292	unsigned char ch;
293	int l;
294
295	ch = '\0';
296
297	while ((l = OF_read(stdin, &ch, 1)) != 1) {
298		if (l != -2 && l != 0) {
299			return (-1);
300		}
301	}
302
303#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
304	if (db_alt_break(ch, &alt_break_state))
305		breakpoint();
306#endif
307
308	return (ch);
309}
310
311static int
312ofw_cons_checkc(struct consdev *cp)
313{
314	unsigned char ch;
315
316	if (OF_read(stdin, &ch, 1) > 0) {
317#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
318		if (db_alt_break(ch, &alt_break_state))
319			breakpoint();
320#endif
321		return (ch);
322	}
323
324	return (-1);
325}
326
327static void
328ofw_cons_putc(struct consdev *cp, int c)
329{
330	char cbuf;
331
332	if (c == '\n') {
333		cbuf = '\r';
334		OF_write(stdout, &cbuf, 1);
335	}
336
337	cbuf = c;
338	OF_write(stdout, &cbuf, 1);
339}
340