mambo_console.c revision 314667 
1/*-
2 * Copyright (C) 2008 by Nathan Whitehorn. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
18 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
19 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
20 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
21 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
22 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include <sys/cdefs.h>
26__FBSDID("$FreeBSD: stable/10/sys/powerpc/mambo/mambo_console.c 314667 2017-03-04 13:03:31Z avg $");
27
28#include <sys/param.h>
29#include <sys/kdb.h>
30#include <sys/kernel.h>
31#include <sys/priv.h>
32#include <sys/systm.h>
33#include <sys/types.h>
34#include <sys/conf.h>
35#include <sys/cons.h>
36#include <sys/consio.h>
37#include <sys/tty.h>
38
39#include <dev/ofw/openfirm.h>
40
41#include <ddb/ddb.h>
42
43#include "mambocall.h"
44
45#define MAMBOBURSTLEN	128	/* max number of bytes to write in one chunk */
46
47#define MAMBO_CONSOLE_WRITE	0
48#define MAMBO_CONSOLE_READ	60
49
50static tsw_outwakeup_t mambotty_outwakeup;
51
52static struct ttydevsw mambo_ttydevsw = {
53	.tsw_flags	= TF_NOPREFIX,
54	.tsw_outwakeup	= mambotty_outwakeup,
55};
56
57static int			polltime;
58static struct callout		mambo_callout;
59static struct tty 		*tp = NULL;
60
61#if defined(KDB)
62static int			alt_break_state;
63#endif
64
65static void	mambo_timeout(void *);
66
67static cn_probe_t	mambo_cnprobe;
68static cn_init_t	mambo_cninit;
69static cn_term_t	mambo_cnterm;
70static cn_getc_t	mambo_cngetc;
71static cn_putc_t	mambo_cnputc;
72static cn_grab_t	mambo_cngrab;
73static cn_ungrab_t	mambo_cnungrab;
74
75CONSOLE_DRIVER(mambo);
76
77static void
78cn_drvinit(void *unused)
79{
80
81	if (mambo_consdev.cn_pri != CN_DEAD &&
82	    mambo_consdev.cn_name[0] != '\0') {
83		if (OF_finddevice("/mambo") == -1)
84			return;
85
86		tp = tty_alloc(&mambo_ttydevsw, NULL);
87		tty_init_console(tp, 0);
88		tty_makedev(tp, NULL, "%s", "mambocons");
89
90		polltime = 1;
91
92		callout_init(&mambo_callout, 1);
93		callout_reset(&mambo_callout, polltime, mambo_timeout, NULL);
94	}
95}
96
97SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
98
99static void
100mambotty_outwakeup(struct tty *tp)
101{
102	int len;
103	u_char buf[MAMBOBURSTLEN];
104
105	for (;;) {
106		len = ttydisc_getc(tp, buf, sizeof buf);
107		if (len == 0)
108			break;
109		mambocall(MAMBO_CONSOLE_WRITE, buf, (register_t)len, 1UL);
110	}
111}
112
113static void
114mambo_timeout(void *v)
115{
116	int 	c;
117
118	tty_lock(tp);
119	while ((c = mambo_cngetc(NULL)) != -1)
120		ttydisc_rint(tp, c, 0);
121	ttydisc_rint_done(tp);
122	tty_unlock(tp);
123
124	callout_reset(&mambo_callout, polltime, mambo_timeout, NULL);
125}
126
127static void
128mambo_cnprobe(struct consdev *cp)
129{
130	if (OF_finddevice("/mambo") == -1) {
131		cp->cn_pri = CN_DEAD;
132		return;
133	}
134
135	cp->cn_pri = CN_NORMAL;
136}
137
138static void
139mambo_cninit(struct consdev *cp)
140{
141
142	/* XXX: This is the alias, but that should be good enough */
143	strcpy(cp->cn_name, "mambocons");
144}
145
146static void
147mambo_cnterm(struct consdev *cp)
148{
149}
150
151static void
152mambo_cngrab(struct consdev *cp)
153{
154}
155
156static void
157mambo_cnungrab(struct consdev *cp)
158{
159}
160
161static int
162mambo_cngetc(struct consdev *cp)
163{
164	int ch;
165
166	ch = mambocall(MAMBO_CONSOLE_READ);
167
168	if (ch > 0 && ch < 0xff) {
169#if defined(KDB)
170		kdb_alt_break(ch, &alt_break_state);
171#endif
172		return (ch);
173	}
174
175	return (-1);
176}
177
178static void
179mambo_cnputc(struct consdev *cp, int c)
180{
181	char cbuf;
182
183	cbuf = c;
184	mambocall(MAMBO_CONSOLE_WRITE, &cbuf, 1UL, 1UL);
185}
186