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/systm.h> 36 #include <sys/types.h> 37 #include <sys/conf.h> 38 #include <sys/cons.h> 39 #include <sys/consio.h> 40 #include <sys/tty.h> 41 42 #include <dev/ofw/openfirm.h> 43 44 #include <ddb/ddb.h> 45 46 #ifndef OFWCONS_POLL_HZ 47 #define OFWCONS_POLL_HZ 4 /* 50-100 works best on Ultra2 */ 48 #endif 49 #define OFBURSTLEN 128 /* max number of bytes to write in one chunk */ 50 51 static d_open_t ofw_dev_open; 52 static d_close_t ofw_dev_close; 53 54 static struct cdevsw ofw_cdevsw = { 55 .d_version = D_VERSION, 56 .d_open = ofw_dev_open, 57 .d_close = ofw_dev_close, 58 .d_name = "ofw", 59 .d_flags = D_TTY | D_NEEDGIANT, 60 }; 61 62 static struct tty *ofw_tp = NULL; 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_tty_start(struct tty *); 72 static int ofw_tty_param(struct tty *, struct termios *); 73 static void ofw_tty_stop(struct tty *, int); 74 static void ofw_timeout(void *); 75 76 static cn_probe_t ofw_cons_probe; 77 static cn_init_t ofw_cons_init; 78 static cn_getc_t ofw_cons_getc; 79 static cn_checkc_t ofw_cons_checkc; 80 static cn_putc_t ofw_cons_putc; 81 82 CONS_DRIVER(ofw, ofw_cons_probe, ofw_cons_init, NULL, ofw_cons_getc, 83 ofw_cons_checkc, ofw_cons_putc, NULL); 84 85 static void 86 cn_drvinit(void *unused) 87 { 88 phandle_t options; 89 char output[32]; 90 struct cdev *dev; 91 92 if (ofw_consdev.cn_pri != CN_DEAD && 93 ofw_consdev.cn_name[0] != '\0') { 94 if ((options = OF_finddevice("/options")) == -1 || 95 OF_getprop(options, "output-device", output, 96 sizeof(output)) == -1) 97 return; 98 dev = make_dev(&ofw_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "%s", 99 output); 100 make_dev_alias(dev, "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 ofw_dev_open(struct cdev *dev, int flag, int mode, struct thread *td) 111 { 112 struct tty *tp; 113 int unit; 114 int error, setuptimeout; 115 116 error = 0; 117 setuptimeout = 0; 118 unit = minor(dev); 119 120 tp = ofw_tp = dev->si_tty = ttymalloc(ofw_tp); 121 122 tp->t_oproc = ofw_tty_start; 123 tp->t_param = ofw_tty_param; 124 tp->t_stop = ofw_tty_stop; 125 tp->t_dev = dev; 126 127 if ((tp->t_state & TS_ISOPEN) == 0) { 128 tp->t_state |= TS_CARR_ON; 129 ttychars(tp); 130 tp->t_iflag = TTYDEF_IFLAG; 131 tp->t_oflag = TTYDEF_OFLAG; 132 tp->t_cflag = TTYDEF_CFLAG | CLOCAL; 133 tp->t_lflag = TTYDEF_LFLAG; 134 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 135 ttsetwater(tp); 136 137 setuptimeout = 1; 138 } else if ((tp->t_state & TS_XCLUDE) && suser(td)) { 139 return (EBUSY); 140 } 141 142 error = ttyld_open(tp, dev); 143 144 if (error == 0 && setuptimeout) { 145 polltime = hz / OFWCONS_POLL_HZ; 146 if (polltime < 1) { 147 polltime = 1; 148 } 149 150 ofw_timeouthandle = timeout(ofw_timeout, tp, polltime); 151 } 152 153 return (error); 154 } 155 156 static int 157 ofw_dev_close(struct cdev *dev, int flag, int mode, struct thread *td) 158 { 159 int unit; 160 struct tty *tp; 161 162 unit = minor(dev); 163 tp = ofw_tp; 164 165 if (unit != 0) { 166 return (ENXIO); 167 } 168 169 /* XXX Should be replaced with callout_stop(9) */ 170 untimeout(ofw_timeout, tp, ofw_timeouthandle); 171 ttyld_close(tp, flag); 172 tty_close(tp); 173 174 return (0); 175 } 176 177 178 static int 179 ofw_tty_param(struct tty *tp, struct termios *t) 180 { 181 182 return (0); 183 } 184 185 static void 186 ofw_tty_start(struct tty *tp) 187 { 188 struct clist *cl; 189 int len; 190 u_char buf[OFBURSTLEN]; 191 192 193 if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) 194 return; 195 196 tp->t_state |= TS_BUSY; 197 cl = &tp->t_outq; 198 len = q_to_b(cl, buf, OFBURSTLEN); 199 OF_write(stdout, buf, len); 200 tp->t_state &= ~TS_BUSY; 201 202 ttwwakeup(tp); 203 } 204 205 static void 206 ofw_tty_stop(struct tty *tp, int flag) 207 { 208 209 if (tp->t_state & TS_BUSY) { 210 if ((tp->t_state & TS_TTSTOP) == 0) { 211 tp->t_state |= TS_FLUSH; 212 } 213 } 214 } 215 216 static void 217 ofw_timeout(void *v) 218 { 219 struct tty *tp; 220 int c; 221 222 tp = (struct tty *)v; 223 224 while ((c = ofw_cons_checkc(NULL)) != -1) { 225 if (tp->t_state & TS_ISOPEN) { 226 ttyld_rint(tp, c); 227 } 228 } 229 230 ofw_timeouthandle = timeout(ofw_timeout, tp, polltime); 231 } 232 233 static void 234 ofw_cons_probe(struct consdev *cp) 235 { 236 int chosen; 237 238 if ((chosen = OF_finddevice("/chosen")) == -1) { 239 cp->cn_pri = CN_DEAD; 240 return; 241 } 242 243 if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) { 244 cp->cn_pri = CN_DEAD; 245 return; 246 } 247 248 if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) { 249 cp->cn_pri = CN_DEAD; 250 return; 251 } 252 253 cp->cn_pri = CN_LOW; 254 } 255 256 static void 257 ofw_cons_init(struct consdev *cp) 258 { 259 260 /* XXX: This is the alias, but that should be good enough */ 261 sprintf(cp->cn_name, "ofwcons"); 262 cp->cn_tp = ofw_tp; 263 } 264 265 static int 266 ofw_cons_getc(struct consdev *cp) 267 { 268 unsigned char ch; 269 int l; 270 271 ch = '\0'; 272 273 while ((l = OF_read(stdin, &ch, 1)) != 1) { 274 if (l != -2 && l != 0) { 275 return (-1); 276 } 277 } 278 279 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 280 if (kdb_alt_break(ch, &alt_break_state)) 281 kdb_enter("Break sequence on console"); 282 #endif 283 284 return (ch); 285 } 286 287 static int 288 ofw_cons_checkc(struct consdev *cp) 289 { 290 unsigned char ch; 291 292 if (OF_read(stdin, &ch, 1) > 0) { 293 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 294 if (kdb_alt_break(ch, &alt_break_state)) 295 kdb_enter("Break sequence on console"); 296 #endif 297 return (ch); 298 } 299 300 return (-1); 301 } 302 303 static void 304 ofw_cons_putc(struct consdev *cp, int c) 305 { 306 char cbuf; 307 308 if (c == '\n') { 309 cbuf = '\r'; 310 OF_write(stdout, &cbuf, 1); 311 } 312 313 cbuf = c; 314 OF_write(stdout, &cbuf, 1); 315 } 316