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: head/sys/dev/cfe/cfe_console.c 225214 2011-08-27 14:24:27Z rwatson $");
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
51static tsw_open_t cfe_tty_open;
52static tsw_close_t cfe_tty_close;
53static tsw_outwakeup_t cfe_tty_outwakeup;
54
55static 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
62static int conhandle = -1;
63/* XXX does cfe have to poll? */
64static int polltime;
65static struct callout_handle cfe_timeouthandle
66 = CALLOUT_HANDLE_INITIALIZER(&cfe_timeouthandle);
67
68#if defined(KDB)
69static int alt_break_state;
70#endif
71
72static void cfe_timeout(void *);
73
74static cn_probe_t cfe_cnprobe;
75static cn_init_t cfe_cninit;
76static cn_term_t cfe_cnterm;
77static cn_getc_t cfe_cngetc;
78static cn_putc_t cfe_cnputc;
79
80CONSOLE_DRIVER(cfe);
81
82static void
83cn_drvinit(void *unused)
84{
85 struct tty *tp;
86
87 if (cfe_consdev.cn_pri != CN_DEAD &&
88 cfe_consdev.cn_name[0] != '\0') {
89 tp = tty_alloc(&cfe_ttydevsw, NULL);
90 tty_makedev(tp, NULL, "cfecons");
91 }
92}
93
94static int
95cfe_tty_open(struct tty *tp)
96{
97 polltime = hz / CFECONS_POLL_HZ;
98 if (polltime < 1)
99 polltime = 1;
100 cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
101
102 return (0);
103}
104
105static void
106cfe_tty_close(struct tty *tp)
107{
108
109 /* XXX Should be replaced with callout_stop(9) */
110 untimeout(cfe_timeout, tp, cfe_timeouthandle);
111}
112
113static void
114cfe_tty_outwakeup(struct tty *tp)
115{
116 int len, written, rc;
117 u_char buf[CFEBURSTLEN];
118
119 for (;;) {
120 len = ttydisc_getc(tp, buf, sizeof buf);
121 if (len == 0)
122 break;
123
124 written = 0;
125 while (written < len) {
126 rc = cfe_write(conhandle, &buf[written], len - written);
127 if (rc < 0)
128 break;
129 written += rc;
130 }
131 }
132}
133
134static void
135cfe_timeout(void *v)
136{
137 struct tty *tp;
138 int c;
139
140 tp = (struct tty *)v;
141
142 tty_lock(tp);
143 while ((c = cfe_cngetc(NULL)) != -1)
144 ttydisc_rint(tp, c, 0);
145 ttydisc_rint_done(tp);
146 tty_unlock(tp);
147
148 cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
149}
150
151static void
152cfe_cnprobe(struct consdev *cp)
153{
154
155 conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
156 if (conhandle < 0) {
157 cp->cn_pri = CN_DEAD;
158 return;
159 }
160
161 /* XXX */
162 if (bootverbose) {
163 char *bootmsg = "Using CFE firmware console.\n";
164 int i;
165
166 for (i = 0; i < strlen(bootmsg); i++)
167 cfe_cnputc(cp, bootmsg[i]);
168 }
169
170 cp->cn_pri = CN_LOW;
171}
172
173static void
174cfe_cninit(struct consdev *cp)
175{
176
177 strcpy(cp->cn_name, "cfecons");
178}
179
180static void
181cfe_cnterm(struct consdev *cp)
182{
183
184}
185
186static int
187cfe_cngetc(struct consdev *cp)
188{
189 unsigned char ch;
190
191 if (cfe_read(conhandle, &ch, 1) == 1) {
192#if defined(KDB)
193 kdb_alt_break(ch, &alt_break_state);
194#endif
195 return (ch);
196 }
197
198 return (-1);
199}
200
201static void
202cfe_cnputc(struct consdev *cp, int c)
203{
204 char cbuf;
205
206 if (c == '\n')
207 cfe_cnputc(cp, '\r');
208
209 cbuf = c;
210 while (cfe_write(conhandle, &cbuf, 1) == 0)
211 continue;
212}
213
214SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);