1 /* $NetBSD: pcons.c,v 1.19 2008/07/06 13:29:50 tsutsui 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 1.19 2008/07/06 13:29:50 tsutsui 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 #include <sys/kauth.h> 53 54 #include <machine/autoconf.h> 55 #include <machine/promlib.h> 56 #include <machine/cpu.h> 57 #include <machine/psl.h> 58 59 #include <dev/cons.h> 60 61 #include <sun2/dev/cons.h> 62 63 #include "ioconf.h" 64 65 static int pconsmatch(device_t, cfdata_t, void *); 66 static void pconsattach(device_t, device_t, void *); 67 68 CFATTACH_DECL_NEW(pcons, sizeof(struct pconssoftc), 69 pconsmatch, pconsattach, NULL, NULL); 70 71 static struct cnm_state pcons_cnm_state; 72 73 static int pconsprobe(void); 74 75 dev_type_open(pconsopen); 76 dev_type_close(pconsclose); 77 dev_type_read(pconsread); 78 dev_type_write(pconswrite); 79 dev_type_ioctl(pconsioctl); 80 dev_type_tty(pconstty); 81 dev_type_poll(pconspoll); 82 83 const struct cdevsw pcons_cdevsw = { 84 pconsopen, pconsclose, pconsread, pconswrite, pconsioctl, 85 nostop, pconstty, pconspoll, nommap, ttykqfilter, D_TTY 86 }; 87 88 static int 89 pconsmatch(device_t parent, cfdata_t cf, void *aux) 90 { 91 struct mainbus_attach_args *ma = aux; 92 extern int prom_cngetc(dev_t); 93 94 /* Only attach if no other console has attached. */ 95 return (ma->ma_name != NULL) && 96 (strcmp("pcons", ma->ma_name) == 0) && 97 (cn_tab->cn_getc == prom_cngetc); 98 99 } 100 101 static void 102 pconsattach(device_t parent, device_t self, void *aux) 103 { 104 struct pconssoftc *sc = device_private(self); 105 106 aprint_normal("\n"); 107 if (!pconsprobe()) 108 return; 109 110 cn_init_magic(&pcons_cnm_state); 111 cn_set_magic("+++++"); 112 callout_init(&sc->sc_poll_ch, 0); 113 } 114 115 static void pconsstart(struct tty *); 116 static int pconsparam(struct tty *, struct termios *); 117 static void pcons_poll(void *); 118 119 int 120 pconsopen(dev_t dev, int flag, int mode, struct lwp *l) 121 { 122 struct pconssoftc *sc; 123 struct tty *tp; 124 125 sc = device_lookup_private(&pcons_cd, minor(dev)); 126 if (sc == NULL) 127 return ENXIO; 128 if ((tp = sc->of_tty) == NULL) 129 sc->of_tty = tp = ttymalloc(); 130 tp->t_oproc = pconsstart; 131 tp->t_param = pconsparam; 132 tp->t_dev = dev; 133 cn_tab->cn_dev = dev; 134 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 135 return (EBUSY); 136 if ((tp->t_state & TS_ISOPEN) == 0) { 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 } 146 tp->t_state |= TS_CARR_ON; 147 148 if ((sc->of_flags & OFPOLL) == 0) { 149 sc->of_flags |= OFPOLL; 150 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 151 } 152 153 return (*tp->t_linesw->l_open)(dev, tp); 154 } 155 156 int 157 pconsclose(dev_t dev, int flag, int mode, struct lwp *l) 158 { 159 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 160 struct tty *tp = sc->of_tty; 161 162 callout_stop(&sc->sc_poll_ch); 163 sc->of_flags &= ~OFPOLL; 164 (*tp->t_linesw->l_close)(tp, flag); 165 ttyclose(tp); 166 return 0; 167 } 168 169 int 170 pconsread(dev_t dev, struct uio *uio, int flag) 171 { 172 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 173 struct tty *tp = sc->of_tty; 174 175 return (*tp->t_linesw->l_read)(tp, uio, flag); 176 } 177 178 int 179 pconswrite(dev_t dev, struct uio *uio, int flag) 180 { 181 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 182 struct tty *tp = sc->of_tty; 183 184 return (*tp->t_linesw->l_write)(tp, uio, flag); 185 } 186 187 int 188 pconspoll(dev_t dev, int events, struct lwp *l) 189 { 190 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 191 struct tty *tp = sc->of_tty; 192 193 return (*tp->t_linesw->l_poll)(tp, events, l); 194 } 195 196 int 197 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 198 { 199 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 200 struct tty *tp = sc->of_tty; 201 int error; 202 203 if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) >= 0) 204 return error; 205 if ((error = ttioctl(tp, cmd, data, flag, l)) >= 0) 206 return error; 207 return ENOTTY; 208 } 209 210 struct tty * 211 pconstty(dev_t dev) 212 { 213 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 214 215 return sc->of_tty; 216 } 217 218 static void 219 pconsstart(struct tty *tp) 220 { 221 struct clist *cl; 222 int s, len; 223 uint8_t buf[OFBURSTLEN]; 224 225 s = spltty(); 226 if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) { 227 splx(s); 228 return; 229 } 230 tp->t_state |= TS_BUSY; 231 splx(s); 232 cl = &tp->t_outq; 233 len = q_to_b(cl, buf, OFBURSTLEN); 234 prom_putstr(buf, len); 235 s = spltty(); 236 tp->t_state &= ~TS_BUSY; 237 if (ttypull(tp)) { 238 tp->t_state |= TS_TIMEOUT; 239 callout_schedule(&tp->t_rstrt_ch, 1); 240 } 241 splx(s); 242 } 243 244 static int 245 pconsparam(struct tty *tp, struct termios *t) 246 { 247 248 tp->t_ispeed = t->c_ispeed; 249 tp->t_ospeed = t->c_ospeed; 250 tp->t_cflag = t->c_cflag; 251 return 0; 252 } 253 254 static void 255 pcons_poll(void *aux) 256 { 257 struct pconssoftc *sc = aux; 258 struct tty *tp = sc->of_tty; 259 int c; 260 char ch; 261 262 while ((c = prom_peekchar()) >= 0) { 263 ch = c; 264 cn_check_magic(tp->t_dev, ch, pcons_cnm_state); 265 if (tp && (tp->t_state & TS_ISOPEN)) 266 (*tp->t_linesw->l_rint)(ch, tp); 267 } 268 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 269 } 270 271 int 272 pconsprobe(void) 273 { 274 275 switch (prom_version()) { 276 #ifdef PROM_OLDMON 277 case PROM_OLDMON: 278 case PROM_OBP_V0: 279 return 1; 280 #endif /* PROM_OLDMON */ 281 #ifdef PROM_OBP_V2 282 case PROM_OBP_V2: 283 case PROM_OBP_V3: 284 case PROM_OPENFIRM: 285 return prom_stdin() && prom_stdout(); 286 #endif /* PROM_OBP_V2 */ 287 default: 288 break; 289 } 290 return 0; 291 } 292 293 void 294 pcons_cnpollc(dev_t dev, int on) 295 { 296 struct pconssoftc *sc; 297 298 sc = device_lookup_private(&pcons_cd, minor(dev)); 299 if (sc == NULL) 300 return; 301 302 if (on) { 303 if (sc->of_flags & OFPOLL) 304 callout_stop(&sc->sc_poll_ch); 305 sc->of_flags &= ~OFPOLL; 306 } else { 307 /* Resuming kernel. */ 308 if ((sc->of_flags & OFPOLL) == 0) { 309 sc->of_flags |= OFPOLL; 310 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 311 } 312 } 313 } 314 315 void pcons_dopoll(void); 316 317 void 318 pcons_dopoll(void) 319 { 320 321 pcons_poll(device_lookup_private(&pcons_cd, 0)); 322 } 323