1 /*- 2 * Copyright (C) 2001 Benno Rice. 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 Benno Rice ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include "opt_comconsole.h" 30 #include "opt_ofw.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/ofw/openfirm.h> 44 45 #include <ddb/ddb.h> 46 47 #ifndef OFWCONS_POLL_HZ 48 #define OFWCONS_POLL_HZ 4 /* 50-100 works best on Ultra2 */ 49 #endif 50 #define OFBURSTLEN 128 /* max number of bytes to write in one chunk */ 51 52 static tsw_open_t ofwtty_open; 53 static tsw_close_t ofwtty_close; 54 static tsw_outwakeup_t ofwtty_outwakeup; 55 56 static struct ttydevsw ofw_ttydevsw = { 57 .tsw_flags = TF_NOPREFIX, 58 .tsw_open = ofwtty_open, 59 .tsw_close = ofwtty_close, 60 .tsw_outwakeup = ofwtty_outwakeup, 61 }; 62 63 static struct tty *ofw_tp = NULL; 64 static int polltime; 65 static struct callout_handle ofw_timeouthandle 66 = CALLOUT_HANDLE_INITIALIZER(&ofw_timeouthandle); 67 68 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 69 static int alt_break_state; 70 #endif 71 72 static void ofw_timeout(void *); 73 74 static cn_probe_t ofw_cnprobe; 75 static cn_init_t ofw_cninit; 76 static cn_term_t ofw_cnterm; 77 static cn_getc_t ofw_cngetc; 78 static cn_putc_t ofw_cnputc; 79 80 CONSOLE_DRIVER(ofw); 81 82 static void 83 cn_drvinit(void *unused) 84 { 85 phandle_t options; 86 char output[32]; 87 struct tty *tp; 88 89 if (ofw_consdev.cn_pri != CN_DEAD && 90 ofw_consdev.cn_name[0] != '\0') { 91 if ((options = OF_finddevice("/options")) == -1 || 92 OF_getprop(options, "output-device", output, 93 sizeof(output)) == -1) 94 return; 95 /* 96 * XXX: This is a hack and it may result in two /dev/ttya 97 * XXX: devices on platforms where the sab driver works. 98 */ 99 tp = tty_alloc(&ofw_ttydevsw, NULL, NULL); 100 tty_makedev(tp, NULL, "%s", output); 101 tty_makealias(tp, "ofwcons"); 102 } 103 } 104 105 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 106 107 static int stdin; 108 static int stdout; 109 110 static int 111 ofwtty_open(struct tty *tp) 112 { 113 polltime = hz / OFWCONS_POLL_HZ; 114 if (polltime < 1) 115 polltime = 1; 116 117 ofw_timeouthandle = timeout(ofw_timeout, tp, polltime); 118 119 return (0); 120 } 121 122 static void 123 ofwtty_close(struct tty *tp) 124 { 125 126 /* XXX Should be replaced with callout_stop(9) */ 127 untimeout(ofw_timeout, tp, ofw_timeouthandle); 128 } 129 130 static void 131 ofwtty_outwakeup(struct tty *tp) 132 { 133 int len; 134 u_char buf[OFBURSTLEN]; 135 136 for (;;) { 137 len = ttydisc_getc(tp, buf, sizeof buf); 138 if (len == 0) 139 break; 140 OF_write(stdout, buf, len); 141 } 142 } 143 144 static void 145 ofw_timeout(void *v) 146 { 147 struct tty *tp; 148 int c; 149 150 tp = (struct tty *)v; 151 152 tty_lock(tp); 153 while ((c = ofw_cngetc(NULL)) != -1) 154 ttydisc_rint(tp, c, 0); 155 ttydisc_rint_done(tp); 156 tty_unlock(tp); 157 158 ofw_timeouthandle = timeout(ofw_timeout, tp, polltime); 159 } 160 161 static void 162 ofw_cnprobe(struct consdev *cp) 163 { 164 int chosen; 165 166 if ((chosen = OF_finddevice("/chosen")) == -1) { 167 cp->cn_pri = CN_DEAD; 168 return; 169 } 170 171 if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) { 172 cp->cn_pri = CN_DEAD; 173 return; 174 } 175 176 if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) { 177 cp->cn_pri = CN_DEAD; 178 return; 179 } 180 181 cp->cn_pri = CN_LOW; 182 } 183 184 static void 185 ofw_cninit(struct consdev *cp) 186 { 187 188 /* XXX: This is the alias, but that should be good enough */ 189 sprintf(cp->cn_name, "ofwcons"); 190 cp->cn_tp = ofw_tp; 191 } 192 193 static void 194 ofw_cnterm(struct consdev *cp) 195 { 196 } 197 198 static int 199 ofw_cngetc(struct consdev *cp) 200 { 201 unsigned char ch; 202 203 if (OF_read(stdin, &ch, 1) > 0) { 204 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 205 int kdb_brk; 206 207 if ((kdb_brk = kdb_alt_break(ch, &alt_break_state)) != 0) { 208 switch (kdb_brk) { 209 case KDB_REQ_DEBUGGER: 210 kdb_enter(KDB_WHY_BREAK, 211 "Break sequence on console"); 212 break; 213 case KDB_REQ_PANIC: 214 kdb_panic("Panic sequence on console"); 215 break; 216 case KDB_REQ_REBOOT: 217 kdb_reboot(); 218 break; 219 220 } 221 } 222 #endif 223 return (ch); 224 } 225 226 return (-1); 227 } 228 229 static void 230 ofw_cnputc(struct consdev *cp, int c) 231 { 232 char cbuf; 233 234 if (c == '\n') { 235 cbuf = '\r'; 236 OF_write(stdout, &cbuf, 1); 237 } 238 239 cbuf = c; 240 OF_write(stdout, &cbuf, 1); 241 } 242