1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2008 by Nathan Whitehorn. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
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/ofw/openfirm.h>
42
43#include <ddb/ddb.h>
44
45#include "mambocall.h"
46
47#define MAMBOBURSTLEN	128	/* max number of bytes to write in one chunk */
48
49#define MAMBO_CONSOLE_WRITE	0
50#define MAMBO_CONSOLE_READ	60
51
52static tsw_outwakeup_t mambotty_outwakeup;
53
54static struct ttydevsw mambo_ttydevsw = {
55	.tsw_flags	= TF_NOPREFIX,
56	.tsw_outwakeup	= mambotty_outwakeup,
57};
58
59static int			polltime;
60static struct callout		mambo_callout;
61static struct tty 		*tp = NULL;
62
63#if defined(KDB)
64static int			alt_break_state;
65#endif
66
67static void	mambo_timeout(void *);
68
69static cn_probe_t	mambo_cnprobe;
70static cn_init_t	mambo_cninit;
71static cn_term_t	mambo_cnterm;
72static cn_getc_t	mambo_cngetc;
73static cn_putc_t	mambo_cnputc;
74static cn_grab_t	mambo_cngrab;
75static cn_ungrab_t	mambo_cnungrab;
76
77CONSOLE_DRIVER(mambo);
78
79static void
80cn_drvinit(void *unused)
81{
82
83	if (mambo_consdev.cn_pri != CN_DEAD &&
84	    mambo_consdev.cn_name[0] != '\0') {
85		if (OF_finddevice("/mambo") == -1)
86			return;
87
88		tp = tty_alloc(&mambo_ttydevsw, NULL);
89		tty_init_console(tp, 0);
90		tty_makedev(tp, NULL, "%s", "mambocons");
91
92		polltime = 1;
93
94		callout_init(&mambo_callout, 1);
95		callout_reset(&mambo_callout, polltime, mambo_timeout, NULL);
96	}
97}
98
99SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
100
101static void
102mambotty_outwakeup(struct tty *tp)
103{
104	int len;
105	u_char buf[MAMBOBURSTLEN];
106
107	for (;;) {
108		len = ttydisc_getc(tp, buf, sizeof buf);
109		if (len == 0)
110			break;
111		mambocall(MAMBO_CONSOLE_WRITE, buf, (register_t)len, 1UL);
112	}
113}
114
115static void
116mambo_timeout(void *v)
117{
118	int 	c;
119
120	tty_lock(tp);
121	while ((c = mambo_cngetc(NULL)) != -1)
122		ttydisc_rint(tp, c, 0);
123	ttydisc_rint_done(tp);
124	tty_unlock(tp);
125
126	callout_reset(&mambo_callout, polltime, mambo_timeout, NULL);
127}
128
129static void
130mambo_cnprobe(struct consdev *cp)
131{
132	if (OF_finddevice("/mambo") == -1) {
133		cp->cn_pri = CN_DEAD;
134		return;
135	}
136
137	cp->cn_pri = CN_NORMAL;
138}
139
140static void
141mambo_cninit(struct consdev *cp)
142{
143
144	/* XXX: This is the alias, but that should be good enough */
145	strcpy(cp->cn_name, "mambocons");
146}
147
148static void
149mambo_cnterm(struct consdev *cp)
150{
151}
152
153static void
154mambo_cngrab(struct consdev *cp)
155{
156}
157
158static void
159mambo_cnungrab(struct consdev *cp)
160{
161}
162
163static int
164mambo_cngetc(struct consdev *cp)
165{
166	int ch;
167
168	ch = mambocall(MAMBO_CONSOLE_READ);
169
170	if (ch > 0 && ch < 0xff) {
171#if defined(KDB)
172		kdb_alt_break(ch, &alt_break_state);
173#endif
174		return (ch);
175	}
176
177	return (-1);
178}
179
180static void
181mambo_cnputc(struct consdev *cp, int c)
182{
183	char cbuf;
184
185	cbuf = c;
186	mambocall(MAMBO_CONSOLE_WRITE, &cbuf, 1UL, 1UL);
187}
188