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         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 int
 189 cfe_cngetc(struct consdev *cp)
 190 {
 191         unsigned char ch;
 192
 193         if (cfe_read(conhandle, &ch, 1) == 1) {
 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);