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[FreeBSD/releng/9.2.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 <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
51 static tsw_open_t cfe_tty_open;
52 static tsw_close_t cfe_tty_close;
53 static tsw_outwakeup_t cfe_tty_outwakeup;
54
55 static 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
62 static int                      conhandle = -1;
63 /* XXX does cfe have to poll? */
64 static int                      polltime;
65 static struct callout_handle    cfe_timeouthandle
66     = CALLOUT_HANDLE_INITIALIZER(&cfe_timeouthandle);
67
68 #if defined(KDB)
69 static int                      alt_break_state;
70 #endif
71
72 static void     cfe_timeout(void *);
73
74 static cn_probe_t       cfe_cnprobe;
75 static cn_init_t        cfe_cninit;
76 static cn_term_t        cfe_cnterm;
77 static cn_getc_t        cfe_cngetc;
78 static cn_putc_t        cfe_cnputc;
79 static cn_grab_t        cfe_cngrab;
80 static cn_ungrab_t      cfe_cnungrab;
81
82 CONSOLE_DRIVER(cfe);
83
84 static void
85 cn_drvinit(void *unused)
86 {
87         struct tty *tp;
88
89         if (cfe_consdev.cn_pri != CN_DEAD &&
90             cfe_consdev.cn_name[0] != '\0') {
91                 tp = tty_alloc(&cfe_ttydevsw, NULL);
92                 tty_makedev(tp, NULL, "cfecons");
93         }
94 }
95
96 static int
97 cfe_tty_open(struct tty *tp)
98 {
99         polltime = hz / CFECONS_POLL_HZ;
100         if (polltime < 1)
101                 polltime = 1;
102         cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
103
104         return (0);
105 }
106
107 static void
108 cfe_tty_close(struct tty *tp)
109 {
110
111         /* XXX Should be replaced with callout_stop(9) */
112         untimeout(cfe_timeout, tp, cfe_timeouthandle);
113 }
114
115 static void
116 cfe_tty_outwakeup(struct tty *tp)
117 {
118         int len, written, rc;
119         u_char buf[CFEBURSTLEN];
120
121         for (;;) {
122                 len = ttydisc_getc(tp, buf, sizeof buf);
123                 if (len == 0)
124                         break;
125
126                 written = 0;
127                 while (written < len) {
128                         rc = cfe_write(conhandle, &buf[written], len - written);
129                         if (rc < 0)
130                                 break;
131                         written += rc;
132                 }
133         }
134 }
135
136 static void
137 cfe_timeout(void *v)
138 {
139         struct  tty *tp;
140         int     c;
141
142         tp = (struct tty *)v;
143
144         tty_lock(tp);
145         while ((c = cfe_cngetc(NULL)) != -1)
146                 ttydisc_rint(tp, c, 0);
147         ttydisc_rint_done(tp);
148         tty_unlock(tp);
149
150         cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
151 }
152
153 static void
154 cfe_cnprobe(struct consdev *cp)
155 {
156
157         conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
158         if (conhandle < 0) {
159                 cp->cn_pri = CN_DEAD;
160                 return;
161         }
162
163         /* XXX */
164         if (bootverbose) {
165                 char *bootmsg = "Using CFE firmware console.\n";
166                 int i;
167
168                 for (i = 0; i < strlen(bootmsg); i++)
169                         cfe_cnputc(cp, bootmsg[i]);
170         }
171
172         cp->cn_pri = CN_LOW;
173 }
174
175 static void
176 cfe_cninit(struct consdev *cp)
177 {
178
179         strcpy(cp->cn_name, "cfecons");
180 }
181
182 static void
183 cfe_cnterm(struct consdev *cp)
184 {
185
186 }
187
188 static void
189 cfe_cngrab(struct consdev *cp)
190 {
191
192 }
193
194 static void
195 cfe_cnungrab(struct consdev *cp)
196 {
197
198 }
199
200 static int
201 cfe_cngetc(struct consdev *cp)
202 {
203         unsigned char ch;
204
205         if (cfe_read(conhandle, &ch, 1) == 1) {
206 #if defined(KDB)
207                 kdb_alt_break(ch, &alt_break_state);
208 #endif
209                 return (ch);
210         }
211
212         return (-1);
213 }
214
215 static void
216 cfe_cnputc(struct consdev *cp, int c)
217 {
218         char cbuf;
219
220         if (c == '\n')
221                 cfe_cnputc(cp, '\r');
222
223         cbuf = c;
224         while (cfe_write(conhandle, &cbuf, 1) == 0)
225                 continue;
226 }
227
228 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);