cfe_console.c revision 266891 
1/*-
2 * Copyright (c) 2007 Bruce M. Simpson.
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 THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/cfe/cfe_console.c 266891 2014-05-30 15:46:10Z jhb $");
29
30#include <sys/param.h>
31#include <sys/kdb.h>
32#include <sys/kernel.h>
33#include <sys/priv.h>
34#include <sys/systm.h>
35#include <sys/types.h>
36#include <sys/conf.h>
37#include <sys/cons.h>
38#include <sys/consio.h>
39#include <sys/tty.h>
40
41#include <dev/cfe/cfe_api.h>
42#include <dev/cfe/cfe_error.h>
43
44#include <ddb/ddb.h>
45
46#ifndef	CFECONS_POLL_HZ
47#define	CFECONS_POLL_HZ	4
48#endif
49#define CFEBURSTLEN	128	/* max number of bytes to write in one chunk */
50
51static tsw_open_t cfe_tty_open;
52static tsw_close_t cfe_tty_close;
53static tsw_outwakeup_t cfe_tty_outwakeup;
54
55static struct ttydevsw cfe_ttydevsw = {
56	.tsw_flags	= TF_NOPREFIX,
57	.tsw_open	= cfe_tty_open,
58	.tsw_close	= cfe_tty_close,
59	.tsw_outwakeup	= cfe_tty_outwakeup,
60};
61
62static int			conhandle = -1;
63/* XXX does cfe have to poll? */
64static int			polltime;
65static struct callout		cfe_timer;
66
67#if defined(KDB)
68static int			alt_break_state;
69#endif
70
71static void	cfe_timeout(void *);
72
73static cn_probe_t	cfe_cnprobe;
74static cn_init_t	cfe_cninit;
75static cn_term_t	cfe_cnterm;
76static cn_getc_t	cfe_cngetc;
77static cn_putc_t	cfe_cnputc;
78static cn_grab_t	cfe_cngrab;
79static cn_ungrab_t	cfe_cnungrab;
80
81CONSOLE_DRIVER(cfe);
82
83static void
84cn_drvinit(void *unused)
85{
86	struct tty *tp;
87
88	if (cfe_consdev.cn_pri != CN_DEAD &&
89	    cfe_consdev.cn_name[0] != '\0') {
90		tp = tty_alloc(&cfe_ttydevsw, NULL);
91		callout_init_mtx(&cfe_timer, tty_getlock(tp), 0);
92		tty_makedev(tp, NULL, "cfecons");
93	}
94}
95
96static int
97cfe_tty_open(struct tty *tp)
98{
99	polltime = hz / CFECONS_POLL_HZ;
100	if (polltime < 1)
101		polltime = 1;
102	callout_reset(&cfe_timer, polltime, cfe_timeout, tp);
103
104	return (0);
105}
106
107static void
108cfe_tty_close(struct tty *tp)
109{
110
111	callout_stop(&cfe_timer);
112}
113
114static void
115cfe_tty_outwakeup(struct tty *tp)
116{
117	int len, written, rc;
118	u_char buf[CFEBURSTLEN];
119
120	for (;;) {
121		len = ttydisc_getc(tp, buf, sizeof buf);
122		if (len == 0)
123			break;
124
125		written = 0;
126		while (written < len) {
127			rc = cfe_write(conhandle, &buf[written], len - written);
128			if (rc < 0)
129				break;
130			written += rc;
131		}
132	}
133}
134
135static void
136cfe_timeout(void *v)
137{
138	struct	tty *tp;
139	int 	c;
140
141	tp = (struct tty *)v;
142
143	tty_lock_assert(tp, MA_OWNED);
144	while ((c = cfe_cngetc(NULL)) != -1)
145		ttydisc_rint(tp, c, 0);
146	ttydisc_rint_done(tp);
147
148	callout_reset(&cfe_timer, polltime, cfe_timeout, tp);
149}
150
151static void
152cfe_cnprobe(struct consdev *cp)
153{
154
155	conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
156	if (conhandle < 0) {
157		cp->cn_pri = CN_DEAD;
158		return;
159	}
160
161	/* XXX */
162	if (bootverbose) {
163		char *bootmsg = "Using CFE firmware console.\n";
164		int i;
165
166		for (i = 0; i < strlen(bootmsg); i++)
167			cfe_cnputc(cp, bootmsg[i]);
168	}
169
170	cp->cn_pri = CN_LOW;
171}
172
173static void
174cfe_cninit(struct consdev *cp)
175{
176
177	strcpy(cp->cn_name, "cfecons");
178}
179
180static void
181cfe_cnterm(struct consdev *cp)
182{
183
184}
185
186static void
187cfe_cngrab(struct consdev *cp)
188{
189
190}
191
192static void
193cfe_cnungrab(struct consdev *cp)
194{
195
196}
197
198static int
199cfe_cngetc(struct consdev *cp)
200{
201	unsigned char ch;
202
203	if (cfe_read(conhandle, &ch, 1) == 1) {
204#if defined(KDB)
205		kdb_alt_break(ch, &alt_break_state);
206#endif
207		return (ch);
208	}
209
210	return (-1);
211}
212
213static void
214cfe_cnputc(struct consdev *cp, int c)
215{
216	char cbuf;
217
218	if (c == '\n')
219		cfe_cnputc(cp, '\r');
220
221	cbuf = c;
222	while (cfe_write(conhandle, &cbuf, 1) == 0)
223		continue;
224}
225
226SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
227