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 int polltime; 64 static struct callout_handle ofw_timeouthandle 65 = CALLOUT_HANDLE_INITIALIZER(&ofw_timeouthandle); 66 67 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 68 static int alt_break_state; 69 #endif 70 71 static void ofw_timeout(void *); 72 73 static cn_probe_t ofw_cnprobe; 74 static cn_init_t ofw_cninit; 75 static cn_term_t ofw_cnterm; 76 static cn_getc_t ofw_cngetc; 77 static cn_putc_t ofw_cnputc; 78 79 CONSOLE_DRIVER(ofw); 80 81 static void 82 cn_drvinit(void *unused) 83 { 84 phandle_t options; 85 char output[32]; 86 struct tty *tp; 87 88 if (ofw_consdev.cn_pri != CN_DEAD && 89 ofw_consdev.cn_name[0] != '\0') { 90 if ((options = OF_finddevice("/options")) == -1 || 91 OF_getprop(options, "output-device", output, 92 sizeof(output)) == -1) 93 return; 94 /* 95 * XXX: This is a hack and it may result in two /dev/ttya 96 * XXX: devices on platforms where the sab driver works. 97 */ 98 tp = tty_alloc(&ofw_ttydevsw, NULL); 99 tty_makedev(tp, NULL, "%s", output); 100 tty_makealias(tp, "ofwcons"); 101 } 102 } 103 104 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 105 106 static int stdin; 107 static int stdout; 108 109 static int 110 ofwtty_open(struct tty *tp) 111 { 112 polltime = hz / OFWCONS_POLL_HZ; 113 if (polltime < 1) 114 polltime = 1; 115 116 ofw_timeouthandle = timeout(ofw_timeout, tp, polltime); 117 118 return (0); 119 } 120 121 static void 122 ofwtty_close(struct tty *tp) 123 { 124 125 /* XXX Should be replaced with callout_stop(9) */ 126 untimeout(ofw_timeout, tp, ofw_timeouthandle); 127 } 128 129 static void 130 ofwtty_outwakeup(struct tty *tp) 131 { 132 int len; 133 u_char buf[OFBURSTLEN]; 134 135 for (;;) { 136 len = ttydisc_getc(tp, buf, sizeof buf); 137 if (len == 0) 138 break; 139 OF_write(stdout, buf, len); 140 } 141 } 142 143 static void 144 ofw_timeout(void *v) 145 { 146 struct tty *tp; 147 int c; 148 149 tp = (struct tty *)v; 150 151 tty_lock(tp); 152 while ((c = ofw_cngetc(NULL)) != -1) 153 ttydisc_rint(tp, c, 0); 154 ttydisc_rint_done(tp); 155 tty_unlock(tp); 156 157 ofw_timeouthandle = timeout(ofw_timeout, tp, polltime); 158 } 159 160 static void 161 ofw_cnprobe(struct consdev *cp) 162 { 163 int chosen; 164 165 if ((chosen = OF_finddevice("/chosen")) == -1) { 166 cp->cn_pri = CN_DEAD; 167 return; 168 } 169 170 if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) { 171 cp->cn_pri = CN_DEAD; 172 return; 173 } 174 175 if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) { 176 cp->cn_pri = CN_DEAD; 177 return; 178 } 179 180 cp->cn_pri = CN_LOW; 181 } 182 183 static void 184 ofw_cninit(struct consdev *cp) 185 { 186 187 /* XXX: This is the alias, but that should be good enough */ 188 strcpy(cp->cn_name, "ofwcons"); 189 } 190 191 static void 192 ofw_cnterm(struct consdev *cp) 193 { 194 } 195 196 static int 197 ofw_cngetc(struct consdev *cp) 198 { 199 unsigned char ch; 200 201 if (OF_read(stdin, &ch, 1) > 0) { 202 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 203 int kdb_brk; 204 205 if ((kdb_brk = kdb_alt_break(ch, &alt_break_state)) != 0) { 206 switch (kdb_brk) { 207 case KDB_REQ_DEBUGGER: 208 kdb_enter(KDB_WHY_BREAK, 209 "Break sequence on console"); 210 break; 211 case KDB_REQ_PANIC: 212 kdb_panic("Panic sequence on console"); 213 break; 214 case KDB_REQ_REBOOT: 215 kdb_reboot(); 216 break; 217 218 } 219 } 220 #endif 221 return (ch); 222 } 223 224 return (-1); 225 } 226 227 static void 228 ofw_cnputc(struct consdev *cp, int c) 229 { 230 char cbuf; 231 232 if (c == '\n') { 233 cbuf = '\r'; 234 OF_write(stdout, &cbuf, 1); 235 } 236 237 cbuf = c; 238 OF_write(stdout, &cbuf, 1); 239 } 240