aboutsummaryrefslogtreecommitdiff
path: root/sys/dev/ofw/ofw_console.c
blob: 7d6f5ebd9e7e34ffb5942718cd1a8e8a0d88143d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
/*-
 * Copyright (C) 2001 Benno Rice.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``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 TOOLS GMBH 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_comconsole.h"
#include "opt_ofw.h"

#include <sys/param.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/priv.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/cons.h>
#include <sys/consio.h>
#include <sys/tty.h>

#include <dev/ofw/openfirm.h>

#include <ddb/ddb.h>

#ifndef	OFWCONS_POLL_HZ
#define	OFWCONS_POLL_HZ	4	/* 50-100 works best on Ultra2 */
#endif
#define OFBURSTLEN	128	/* max number of bytes to write in one chunk */

static d_open_t		ofw_dev_open;
static d_close_t	ofw_dev_close;

static struct cdevsw ofw_cdevsw = {
	.d_version =	D_VERSION,
	.d_open =	ofw_dev_open,
	.d_close =	ofw_dev_close,
	.d_name =	"ofw",
	.d_flags =	D_TTY | D_NEEDGIANT,
};

static struct tty		*ofw_tp = NULL;
static int			polltime;
static struct callout_handle	ofw_timeouthandle
    = CALLOUT_HANDLE_INITIALIZER(&ofw_timeouthandle);

#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
static int			alt_break_state;
#endif

static void	ofw_tty_start(struct tty *);
static int	ofw_tty_param(struct tty *, struct termios *);
static void	ofw_tty_stop(struct tty *, int);
static void	ofw_timeout(void *);

static cn_probe_t	ofw_cnprobe;
static cn_init_t	ofw_cninit;
static cn_term_t	ofw_cnterm;
static cn_getc_t	ofw_cngetc;
static cn_putc_t	ofw_cnputc;

CONSOLE_DRIVER(ofw);

static void
cn_drvinit(void *unused)
{
	phandle_t options;
	char output[32];
	struct cdev *dev;

	if (ofw_consdev.cn_pri != CN_DEAD &&
	    ofw_consdev.cn_name[0] != '\0') {
		if ((options = OF_finddevice("/options")) == -1 ||
		    OF_getprop(options, "output-device", output,
		    sizeof(output)) == -1)
			return;
		/*
		 * XXX: This is a hack and it may result in two /dev/ttya
		 * XXX: devices on platforms where the sab driver works.
		 */
		dev = make_dev(&ofw_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "%s",
		    output);
		make_dev_alias(dev, "ofwcons");
	}
}

SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL)

static int	stdin;
static int	stdout;

static int
ofw_dev_open(struct cdev *dev, int flag, int mode, struct thread *td)
{
	struct	tty *tp;
	int	unit;
	int	error, setuptimeout;

	error = 0;
	setuptimeout = 0;
	unit = minor(dev);

	/*
	 * XXX: BAD, should happen at attach time
	 */
	if (dev->si_tty == NULL) {
		ofw_tp = ttyalloc();
		dev->si_tty = ofw_tp;
		ofw_tp->t_dev = dev;
	}
	tp = dev->si_tty;

	tp->t_oproc = ofw_tty_start;
	tp->t_param = ofw_tty_param;
	tp->t_stop = ofw_tty_stop;
	tp->t_dev = dev;

	if ((tp->t_state & TS_ISOPEN) == 0) {
		tp->t_state |= TS_CARR_ON;
		ttyconsolemode(tp, 0);

		setuptimeout = 1;
	} else if ((tp->t_state & TS_XCLUDE) &&
	    priv_check(td, PRIV_TTY_EXCLUSIVE)) {
		return (EBUSY);
	}

	error = ttyld_open(tp, dev);

	if (error == 0 && setuptimeout) {
		polltime = hz / OFWCONS_POLL_HZ;
		if (polltime < 1) {
			polltime = 1;
		}

		ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
	}

	return (error);
}

static int
ofw_dev_close(struct cdev *dev, int flag, int mode, struct thread *td)
{
	int	unit;
	struct	tty *tp;

	unit = minor(dev);
	tp = dev->si_tty;

	if (unit != 0) {
		return (ENXIO);
	}

	/* XXX Should be replaced with callout_stop(9) */
	untimeout(ofw_timeout, tp, ofw_timeouthandle);
	ttyld_close(tp, flag);
	tty_close(tp);

	return (0);
}


static int
ofw_tty_param(struct tty *tp, struct termios *t)
{

	return (0);
}

static void
ofw_tty_start(struct tty *tp)
{
	struct clist *cl;
	int len;
	u_char buf[OFBURSTLEN];


	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP))
		return;

	tp->t_state |= TS_BUSY;
	cl = &tp->t_outq;
	len = q_to_b(cl, buf, OFBURSTLEN);
	OF_write(stdout, buf, len);
	tp->t_state &= ~TS_BUSY;

	ttwwakeup(tp);
}

static void
ofw_tty_stop(struct tty *tp, int flag)
{

	if (tp->t_state & TS_BUSY) {
		if ((tp->t_state & TS_TTSTOP) == 0) {
			tp->t_state |= TS_FLUSH;
		}
	}
}

static void
ofw_timeout(void *v)
{
	struct	tty *tp;
	int 	c;

	tp = (struct tty *)v;

	while ((c = ofw_cngetc(NULL)) != -1) {
		if (tp->t_state & TS_ISOPEN) {
			ttyld_rint(tp, c);
		}
	}

	ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
}

static void
ofw_cnprobe(struct consdev *cp)
{
	int chosen;

	if ((chosen = OF_finddevice("/chosen")) == -1) {
		cp->cn_pri = CN_DEAD;
		return;
	}

	if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) {
		cp->cn_pri = CN_DEAD;
		return;
	}

	if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) {
		cp->cn_pri = CN_DEAD;
		return;
	}

	cp->cn_pri = CN_LOW;
}

static void
ofw_cninit(struct consdev *cp)
{

	/* XXX: This is the alias, but that should be good enough */
	sprintf(cp->cn_name, "ofwcons");
	cp->cn_tp = ofw_tp;
}

static void
ofw_cnterm(struct consdev *cp)
{
}

static int
ofw_cngetc(struct consdev *cp)
{
	unsigned char ch;

	if (OF_read(stdin, &ch, 1) > 0) {
#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
		if (kdb_alt_break(ch, &alt_break_state))
			kdb_enter(KDB_WHY_BREAK, "Break sequence on console");
#endif
		return (ch);
	}

	return (-1);
}

static void
ofw_cnputc(struct consdev *cp, int c)
{
	char cbuf;

	if (c == '\n') {
		cbuf = '\r';
		OF_write(stdout, &cbuf, 1);
	}

	cbuf = c;
	OF_write(stdout, &cbuf, 1);
}