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[FreeBSD/releng/8.1.git] / sys / dev / cfe / cfe_console.c
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("$FreeBSD$");
29
30 #include "opt_comconsole.h"
31
32 #include <sys/param.h>
33 #include <sys/kdb.h>
34 #include <sys/kernel.h>
35 #include <sys/priv.h>
36 #include <sys/systm.h>
37 #include <sys/types.h>
38 #include <sys/conf.h>
39 #include <sys/cons.h>
40 #include <sys/consio.h>
41 #include <sys/tty.h>
42
43 #include <dev/cfe/cfe_api.h>
44 #include <dev/cfe/cfe_error.h>
45
46 #include <ddb/ddb.h>
47
48 #ifndef CFECONS_POLL_HZ
49 #define CFECONS_POLL_HZ 4
50 #endif
51 #define CFEBURSTLEN     128     /* max number of bytes to write in one chunk */
52
53 static tsw_open_t cfe_tty_open;
54 static tsw_close_t cfe_tty_close;
55 static tsw_outwakeup_t cfe_tty_outwakeup;
56
57 static struct ttydevsw cfe_ttydevsw = {
58         .tsw_flags      = TF_NOPREFIX,
59         .tsw_open       = cfe_tty_open,
60         .tsw_close      = cfe_tty_close,
61         .tsw_outwakeup  = cfe_tty_outwakeup,
62 };
63
64 static int                      conhandle = -1;
65 /* XXX does cfe have to poll? */
66 static int                      polltime;
67 static struct callout_handle    cfe_timeouthandle
68     = CALLOUT_HANDLE_INITIALIZER(&cfe_timeouthandle);
69
70 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
71 static int                      alt_break_state;
72 #endif
73
74 static void     cfe_timeout(void *);
75
76 static cn_probe_t       cfe_cnprobe;
77 static cn_init_t        cfe_cninit;
78 static cn_term_t        cfe_cnterm;
79 static cn_getc_t        cfe_cngetc;
80 static cn_putc_t        cfe_cnputc;
81
82 CONSOLE_DRIVER(cfe);
83
84 static void
85 cn_drvinit(void *unused)
86 {
87         char output[32];
88         struct tty *tp;
89
90         if (cfe_consdev.cn_pri != CN_DEAD &&
91             cfe_consdev.cn_name[0] != '\0') {
92                 tp = tty_alloc(&cfe_ttydevsw, NULL);
93                 tty_makedev(tp, NULL, "%s", output);
94                 tty_makealias(tp, "cfecons");
95         }
96 }
97
98 static int
99 cfe_tty_open(struct tty *tp)
100 {
101         polltime = hz / CFECONS_POLL_HZ;
102         if (polltime < 1)
103                 polltime = 1;
104         cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
105
106         return (0);
107 }
108
109 static void
110 cfe_tty_close(struct tty *tp)
111 {
112
113         /* XXX Should be replaced with callout_stop(9) */
114         untimeout(cfe_timeout, tp, cfe_timeouthandle);
115 }
116
117 static void
118 cfe_tty_outwakeup(struct tty *tp)
119 {
120         int len;
121         u_char buf[CFEBURSTLEN];
122
123         for (;;) {
124                 len = ttydisc_getc(tp, buf, sizeof buf);
125                 if (len == 0)
126                         break;
127                 while (cfe_write(conhandle, buf, len) == 0)
128                         continue;
129         }
130 }
131
132 static void
133 cfe_timeout(void *v)
134 {
135         struct  tty *tp;
136         int     c;
137
138         tp = (struct tty *)v;
139
140         tty_lock(tp);
141         while ((c = cfe_cngetc(NULL)) != -1)
142                 ttydisc_rint(tp, c, 0);
143         ttydisc_rint_done(tp);
144         tty_unlock(tp);
145
146         cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
147 }
148
149 static void
150 cfe_cnprobe(struct consdev *cp)
151 {
152
153         conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
154         if (conhandle < 0) {
155                 cp->cn_pri = CN_DEAD;
156                 return;
157         }
158
159         /* XXX */
160         if (bootverbose) {
161                 char *bootmsg = "Using CFE firmware console.\n";
162                 int i;
163
164                 for (i = 0; i < strlen(bootmsg); i++)
165                         cfe_cnputc(cp, bootmsg[i]);
166         }
167
168         cp->cn_pri = CN_LOW;
169 }
170
171 static void
172 cfe_cninit(struct consdev *cp)
173 {
174
175         strcpy(cp->cn_name, "cfecons");
176 }
177
178 static void
179 cfe_cnterm(struct consdev *cp)
180 {
181
182 }
183
184 static int
185 cfe_cngetc(struct consdev *cp)
186 {
187         int result;
188         unsigned char ch;
189
190         while ((result = cfe_read(conhandle, &ch, 1)) == 0)
191                 continue;
192
193         if (result > 0) {
194 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
195                 int kdb_brk;
196
197                 if ((kdb_brk = kdb_alt_break(ch, &alt_break_state)) != 0) {
198                         switch (kdb_brk) {
199                         case KDB_REQ_DEBUGGER:
200                                 kdb_enter(KDB_WHY_BREAK,
201                                     "Break sequence on console");
202                                 break;
203                         case KDB_REQ_PANIC:
204                                 kdb_panic("Panic sequence on console");
205                                 break;
206                         case KDB_REQ_REBOOT:
207                                 kdb_reboot();
208                                 break;
209
210                         }
211                 }
212 #endif
213                 return (ch);
214         }
215
216         return (-1);
217 }
218
219 static void
220 cfe_cnputc(struct consdev *cp, int c)
221 {
222         char cbuf;
223
224         if (c == '\n')
225                 cfe_cnputc(cp, '\r');
226
227         cbuf = c;
228         while (cfe_write(conhandle, &cbuf, 1) == 0)
229                 continue;
230 }
231
232 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);