1 /* $NetBSD: pcons.c,v 1.9 2005/12/11 12:19:16 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 Eduardo E. Horvath 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * Default console driver. Uses the PROM or whatever 33 * driver(s) are appropriate. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: pcons.c,v 1.9 2005/12/11 12:19:16 christos Exp $"); 38 39 #include "opt_ddb.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/conf.h> 44 #include <sys/device.h> 45 #include <sys/file.h> 46 #include <sys/ioctl.h> 47 #include <sys/kernel.h> 48 #include <sys/proc.h> 49 #include <sys/tty.h> 50 #include <sys/time.h> 51 #include <sys/syslog.h> 52 53 #include <machine/autoconf.h> 54 #include <machine/promlib.h> 55 #include <machine/cpu.h> 56 #include <machine/psl.h> 57 58 #include <dev/cons.h> 59 60 #include <sun2/dev/cons.h> 61 62 static int pconsmatch(struct device *, struct cfdata *, void *); 63 static void pconsattach(struct device *, struct device *, void *); 64 65 CFATTACH_DECL(pcons, sizeof(struct pconssoftc), 66 pconsmatch, pconsattach, NULL, NULL); 67 68 extern struct cfdriver pcons_cd; 69 static struct cnm_state pcons_cnm_state; 70 71 static int pconsprobe(void); 72 extern struct consdev *cn_tab; 73 74 dev_type_open(pconsopen); 75 dev_type_close(pconsclose); 76 dev_type_read(pconsread); 77 dev_type_write(pconswrite); 78 dev_type_ioctl(pconsioctl); 79 dev_type_tty(pconstty); 80 dev_type_poll(pconspoll); 81 82 const struct cdevsw pcons_cdevsw = { 83 pconsopen, pconsclose, pconsread, pconswrite, pconsioctl, 84 nostop, pconstty, pconspoll, nommap, ttykqfilter, D_TTY 85 }; 86 87 static int 88 pconsmatch(struct device *parent, struct cfdata *match, void *aux) 89 { 90 struct mainbus_attach_args *ma = aux; 91 extern int prom_cngetc(dev_t); 92 93 /* Only attach if no other console has attached. */ 94 return ((ma->ma_name != NULL) && 95 (strcmp("pcons", ma->ma_name) == 0) && 96 (cn_tab->cn_getc == prom_cngetc)); 97 98 } 99 100 static void 101 pconsattach(struct device *parent, struct device *self, void *aux) 102 { 103 struct pconssoftc *sc = (struct pconssoftc *) self; 104 105 printf("\n"); 106 if (!pconsprobe()) 107 return; 108 109 cn_init_magic(&pcons_cnm_state); 110 cn_set_magic("+++++"); 111 callout_init(&sc->sc_poll_ch); 112 } 113 114 static void pconsstart(struct tty *); 115 static int pconsparam(struct tty *, struct termios *); 116 static void pcons_poll(void *); 117 118 int 119 pconsopen(dev_t dev, int flag, int mode, struct lwp *l) 120 { 121 struct pconssoftc *sc; 122 int unit = minor(dev); 123 struct tty *tp; 124 125 if (unit >= pcons_cd.cd_ndevs) 126 return ENXIO; 127 sc = pcons_cd.cd_devs[unit]; 128 if (!sc) 129 return ENXIO; 130 if (!(tp = sc->of_tty)) 131 sc->of_tty = tp = ttymalloc(); 132 tp->t_oproc = pconsstart; 133 tp->t_param = pconsparam; 134 tp->t_dev = dev; 135 cn_tab->cn_dev = dev; 136 if (!(tp->t_state & TS_ISOPEN)) { 137 ttychars(tp); 138 tp->t_iflag = TTYDEF_IFLAG; 139 tp->t_oflag = TTYDEF_OFLAG; 140 tp->t_cflag = TTYDEF_CFLAG; 141 tp->t_lflag = TTYDEF_LFLAG; 142 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 143 pconsparam(tp, &tp->t_termios); 144 ttsetwater(tp); 145 } else if ((tp->t_state&TS_XCLUDE) && 146 suser(l->l_proc->p_ucred, &l->l_proc->p_acflag)) 147 return EBUSY; 148 tp->t_state |= TS_CARR_ON; 149 150 if (!(sc->of_flags & OFPOLL)) { 151 sc->of_flags |= OFPOLL; 152 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 153 } 154 155 return (*tp->t_linesw->l_open)(dev, tp); 156 } 157 158 int 159 pconsclose(dev_t dev, int flag, int mode, struct lwp *l) 160 { 161 struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)]; 162 struct tty *tp = sc->of_tty; 163 164 callout_stop(&sc->sc_poll_ch); 165 sc->of_flags &= ~OFPOLL; 166 (*tp->t_linesw->l_close)(tp, flag); 167 ttyclose(tp); 168 return 0; 169 } 170 171 int 172 pconsread(dev_t dev, struct uio *uio, int flag) 173 { 174 struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)]; 175 struct tty *tp = sc->of_tty; 176 177 return (*tp->t_linesw->l_read)(tp, uio, flag); 178 } 179 180 int 181 pconswrite(dev_t dev, struct uio *uio, int flag) 182 { 183 struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)]; 184 struct tty *tp = sc->of_tty; 185 186 return (*tp->t_linesw->l_write)(tp, uio, flag); 187 } 188 189 int 190 pconspoll(dev_t dev, int events, struct lwp *l) 191 { 192 struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)]; 193 struct tty *tp = sc->of_tty; 194 195 return ((*tp->t_linesw->l_poll)(tp, events, l)); 196 } 197 198 int 199 pconsioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l) 200 { 201 struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)]; 202 struct tty *tp = sc->of_tty; 203 int error; 204 205 if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) >= 0) 206 return error; 207 if ((error = ttioctl(tp, cmd, data, flag, l)) >= 0) 208 return error; 209 return ENOTTY; 210 } 211 212 struct tty * 213 pconstty(dev_t dev) 214 { 215 struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)]; 216 217 return sc->of_tty; 218 } 219 220 static void 221 pconsstart(struct tty *tp) 222 { 223 struct clist *cl; 224 int s, len; 225 u_char buf[OFBURSTLEN]; 226 227 s = spltty(); 228 if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) { 229 splx(s); 230 return; 231 } 232 tp->t_state |= TS_BUSY; 233 splx(s); 234 cl = &tp->t_outq; 235 len = q_to_b(cl, buf, OFBURSTLEN); 236 prom_putstr(buf, len); 237 s = spltty(); 238 tp->t_state &= ~TS_BUSY; 239 if (cl->c_cc) { 240 tp->t_state |= TS_TIMEOUT; 241 callout_reset(&tp->t_rstrt_ch, 1, ttrstrt, (void *)tp); 242 } 243 if (cl->c_cc <= tp->t_lowat) { 244 if (tp->t_state & TS_ASLEEP) { 245 tp->t_state &= ~TS_ASLEEP; 246 wakeup(cl); 247 } 248 selwakeup(&tp->t_wsel); 249 } 250 splx(s); 251 } 252 253 static int 254 pconsparam(struct tty *tp, struct termios *t) 255 { 256 tp->t_ispeed = t->c_ispeed; 257 tp->t_ospeed = t->c_ospeed; 258 tp->t_cflag = t->c_cflag; 259 return 0; 260 } 261 262 static void 263 pcons_poll(void *aux) 264 { 265 struct pconssoftc *sc = aux; 266 struct tty *tp = sc->of_tty; 267 int c; 268 char ch; 269 270 while ((c = prom_peekchar()) >= 0) { 271 ch = c; 272 cn_check_magic(tp->t_dev, ch, pcons_cnm_state); 273 if (tp && (tp->t_state & TS_ISOPEN)) 274 (*tp->t_linesw->l_rint)(ch, tp); 275 } 276 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 277 } 278 279 int 280 pconsprobe(void) 281 { 282 switch (prom_version()) { 283 #ifdef PROM_OLDMON 284 case PROM_OLDMON: 285 case PROM_OBP_V0: 286 return (1); 287 #endif /* PROM_OLDMON */ 288 #ifdef PROM_OBP_V2 289 case PROM_OBP_V2: 290 case PROM_OBP_V3: 291 case PROM_OPENFIRM: 292 return (prom_stdin() && prom_stdout()); 293 #endif /* PROM_OBP_V2 */ 294 default: break; 295 } 296 return (0); 297 } 298 299 void 300 pcons_cnpollc(dev_t dev, int on) 301 { 302 struct pconssoftc *sc = NULL; 303 304 if (pcons_cd.cd_devs) 305 sc = pcons_cd.cd_devs[minor(dev)]; 306 307 if (on) { 308 if (!sc) return; 309 if (sc->of_flags & OFPOLL) 310 callout_stop(&sc->sc_poll_ch); 311 sc->of_flags &= ~OFPOLL; 312 } else { 313 /* Resuming kernel. */ 314 if (sc && !(sc->of_flags & OFPOLL)) { 315 sc->of_flags |= OFPOLL; 316 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 317 } 318 } 319 } 320 321 void pcons_dopoll(void); 322 void 323 pcons_dopoll(void) 324 { 325 pcons_poll((void*)pcons_cd.cd_devs[0]); 326 } 327