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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("$FreeBSD$");
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
50 static tsw_outwakeup_t mambotty_outwakeup;
51
52 static struct ttydevsw mambo_ttydevsw = {
53         .tsw_flags      = TF_NOPREFIX,
54         .tsw_outwakeup  = mambotty_outwakeup,
55 };
56
57 static int                      polltime;
58 static struct callout           mambo_callout;
59 static struct tty               *tp = NULL;
60
61 #if defined(KDB)
62 static int                      alt_break_state;
63 #endif
64
65 static void     mambo_timeout(void *);
66
67 static cn_probe_t       mambo_cnprobe;
68 static cn_init_t        mambo_cninit;
69 static cn_term_t        mambo_cnterm;
70 static cn_getc_t        mambo_cngetc;
71 static cn_putc_t        mambo_cnputc;
72
73 CONSOLE_DRIVER(mambo);
74
75 static void
76 cn_drvinit(void *unused)
77 {
78
79         if (mambo_consdev.cn_pri != CN_DEAD &&
80             mambo_consdev.cn_name[0] != '\0') {
81                 if (OF_finddevice("/mambo") == -1)
82                         return;
83
84                 tp = tty_alloc(&mambo_ttydevsw, NULL);
85                 tty_init_console(tp, 0);
86                 tty_makedev(tp, NULL, "%s", "mambocons");
87
88                 polltime = 1;
89
90                 callout_init(&mambo_callout, CALLOUT_MPSAFE);
91                 callout_reset(&mambo_callout, polltime, mambo_timeout, NULL);
92         }
93 }
94
95 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
96
97 static void
98 mambotty_outwakeup(struct tty *tp)
99 {
100         int len;
101         u_char buf[MAMBOBURSTLEN];
102
103         for (;;) {
104                 len = ttydisc_getc(tp, buf, sizeof buf);
105                 if (len == 0)
106                         break;
107                 mambocall(MAMBO_CONSOLE_WRITE, buf, (register_t)len, 1UL);
108         }
109 }
110
111 static void
112 mambo_timeout(void *v)
113 {
114         int     c;
115
116         tty_lock(tp);
117         while ((c = mambo_cngetc(NULL)) != -1)
118                 ttydisc_rint(tp, c, 0);
119         ttydisc_rint_done(tp);
120         tty_unlock(tp);
121
122         callout_reset(&mambo_callout, polltime, mambo_timeout, NULL);
123 }
124
125 static void
126 mambo_cnprobe(struct consdev *cp)
127 {
128         if (OF_finddevice("/mambo") == -1) {
129                 cp->cn_pri = CN_DEAD;
130                 return;
131         }
132
133         cp->cn_pri = CN_NORMAL;
134 }
135
136 static void
137 mambo_cninit(struct consdev *cp)
138 {
139
140         /* XXX: This is the alias, but that should be good enough */
141         strcpy(cp->cn_name, "mambocons");
142 }
143
144 static void
145 mambo_cnterm(struct consdev *cp)
146 {
147 }
148
149 static int
150 mambo_cngetc(struct consdev *cp)
151 {
152         int ch;
153
154         ch = mambocall(MAMBO_CONSOLE_READ);
155
156         if (ch > 0 && ch < 0xff) {
157 #if defined(KDB)
158                 kdb_alt_break(ch, &alt_break_state);
159 #endif
160                 return (ch);
161         }
162
163         return (-1);
164 }
165
166 static void
167 mambo_cnputc(struct consdev *cp, int c)
168 {
169         char cbuf;
170
171         cbuf = c;
172         mambocall(MAMBO_CONSOLE_WRITE, &cbuf, 1UL, 1UL);
173 }