1 /* $NetBSD: pcons.c,v 1.29 2008/06/13 13:10:49 cegger 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 1.29 2008/06/13 13:10:49 cegger 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/openfirm.h> 56 #include <machine/cpu.h> 57 #include <machine/eeprom.h> 58 #include <machine/psl.h> 59 60 #include <dev/cons.h> 61 62 #include <sparc64/dev/cons.h> 63 64 static int pconsmatch(struct device *, struct cfdata *, void *); 65 static void pconsattach(struct device *, struct device *, void *); 66 67 CFATTACH_DECL(pcons, sizeof(struct pconssoftc), 68 pconsmatch, pconsattach, NULL, NULL); 69 70 extern struct cfdriver pcons_cd; 71 72 dev_type_open(pconsopen); 73 dev_type_close(pconsclose); 74 dev_type_read(pconsread); 75 dev_type_write(pconswrite); 76 dev_type_ioctl(pconsioctl); 77 dev_type_tty(pconstty); 78 dev_type_poll(pconspoll); 79 80 const struct cdevsw pcons_cdevsw = { 81 pconsopen, pconsclose, pconsread, pconswrite, pconsioctl, 82 nostop, pconstty, pconspoll, nommap, ttykqfilter, D_TTY 83 }; 84 85 static struct cnm_state pcons_cnm_state; 86 87 static int pconsprobe(void); 88 extern struct consdev *cn_tab; 89 90 static int 91 pconsmatch(struct device *parent, struct cfdata *match, void *aux) 92 { 93 struct mainbus_attach_args *ma = aux; 94 extern int prom_cngetc(dev_t); 95 96 /* Only attach if no other console has attached. */ 97 return ((strcmp("pcons", ma->ma_name) == 0) && 98 (cn_tab->cn_getc == prom_cngetc)); 99 100 } 101 102 static void 103 pconsattach(struct device *parent, struct device *self, void *aux) 104 { 105 struct pconssoftc *sc = (struct pconssoftc *) self; 106 107 printf("\n"); 108 if (!pconsprobe()) 109 return; 110 111 cn_init_magic(&pcons_cnm_state); 112 cn_set_magic("+++++"); 113 callout_init(&sc->sc_poll_ch, 0); 114 } 115 116 static void pconsstart(struct tty *); 117 static int pconsparam(struct tty *, struct termios *); 118 static void pcons_poll(void *); 119 120 int 121 pconsopen(dev_t dev, int flag, int mode, struct lwp *l) 122 { 123 struct pconssoftc *sc; 124 struct tty *tp; 125 struct proc *p; 126 127 p = l->l_proc; 128 129 sc = device_lookup_private(&pcons_cd, minor(dev)); 130 if (!sc) 131 return ENXIO; 132 if (!(tp = sc->of_tty)) 133 sc->of_tty = tp = ttymalloc(); 134 tp->t_oproc = pconsstart; 135 tp->t_param = pconsparam; 136 tp->t_dev = dev; 137 cn_tab->cn_dev = dev; 138 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 139 return (EBUSY); 140 if (!(tp->t_state & TS_ISOPEN)) { 141 ttychars(tp); 142 tp->t_iflag = TTYDEF_IFLAG; 143 tp->t_oflag = TTYDEF_OFLAG; 144 tp->t_cflag = TTYDEF_CFLAG; 145 tp->t_lflag = TTYDEF_LFLAG; 146 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 147 pconsparam(tp, &tp->t_termios); 148 ttsetwater(tp); 149 } 150 tp->t_state |= TS_CARR_ON; 151 152 if (!(sc->of_flags & OFPOLL)) { 153 sc->of_flags |= OFPOLL; 154 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 155 } 156 157 return (*tp->t_linesw->l_open)(dev, tp); 158 } 159 160 int 161 pconsclose(dev_t dev, int flag, int mode, struct lwp *l) 162 { 163 struct pconssoftc *sc = device_lookup_private(&pcons_cd,minor(dev)); 164 struct tty *tp = sc->of_tty; 165 166 callout_stop(&sc->sc_poll_ch); 167 sc->of_flags &= ~OFPOLL; 168 (*tp->t_linesw->l_close)(tp, flag); 169 ttyclose(tp); 170 return 0; 171 } 172 173 int 174 pconsread(dev_t dev, struct uio *uio, int flag) 175 { 176 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 177 struct tty *tp = sc->of_tty; 178 179 return (*tp->t_linesw->l_read)(tp, uio, flag); 180 } 181 182 int 183 pconswrite(dev_t dev, struct uio *uio, int flag) 184 { 185 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 186 struct tty *tp = sc->of_tty; 187 188 return (*tp->t_linesw->l_write)(tp, uio, flag); 189 } 190 191 int 192 pconspoll(dev_t dev, int events, struct lwp *l) 193 { 194 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 195 struct tty *tp = sc->of_tty; 196 197 return ((*tp->t_linesw->l_poll)(tp, events, l)); 198 } 199 200 int 201 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 202 { 203 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 204 struct tty *tp = sc->of_tty; 205 int error; 206 207 if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH) 208 return error; 209 return ttioctl(tp, cmd, data, flag, l); 210 } 211 212 struct tty * 213 pconstty(dev_t dev) 214 { 215 struct pconssoftc *sc = device_lookup_private(&pcons_cd, 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_write(prom_stdout(), buf, len); 237 s = spltty(); 238 tp->t_state &= ~TS_BUSY; 239 if (ttypull(tp)) { 240 tp->t_state |= TS_TIMEOUT; 241 callout_schedule(&tp->t_rstrt_ch, 1); 242 } 243 splx(s); 244 } 245 246 static int 247 pconsparam(struct tty *tp, struct termios *t) 248 { 249 tp->t_ispeed = t->c_ispeed; 250 tp->t_ospeed = t->c_ospeed; 251 tp->t_cflag = t->c_cflag; 252 return 0; 253 } 254 255 static void 256 pcons_poll(void *aux) 257 { 258 struct pconssoftc *sc = aux; 259 struct tty *tp = sc->of_tty; 260 char ch; 261 262 while (prom_read(prom_stdin(), &ch, 1) > 0) { 263 cn_check_magic(tp->t_dev, ch, pcons_cnm_state); 264 if (tp && (tp->t_state & TS_ISOPEN)) 265 (*tp->t_linesw->l_rint)(ch, tp); 266 } 267 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 268 } 269 270 int 271 pconsprobe(void) 272 { 273 274 return (prom_stdin() && prom_stdout()); 275 } 276 277 void 278 pcons_cnpollc(dev_t dev, int on) 279 { 280 struct pconssoftc *sc; 281 282 sc = device_lookup_private(&pcons_cd, minor(dev)); 283 if (sc == NULL) 284 return; 285 286 if (on) { 287 if (sc->of_flags & OFPOLL) 288 callout_stop(&sc->sc_poll_ch); 289 sc->of_flags &= ~OFPOLL; 290 } else { 291 /* Resuming kernel. */ 292 if (!(sc->of_flags & OFPOLL)) { 293 sc->of_flags |= OFPOLL; 294 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 295 } 296 } 297 } 298 299 void pcons_dopoll(void); 300 void 301 pcons_dopoll(void) 302 { 303 pcons_poll(device_lookup_private(&pcons_cd, 0)); 304 } 305