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); 233