1 /* $NetBSD: pcons.c,v 1.31 2011/06/03 03:20:39 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 1.31 2011/06/03 03:20:39 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 #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(device_t, cfdata_t, void *); 65 static void pconsattach(device_t, device_t, void *); 66 67 CFATTACH_DECL_NEW(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(device_t parent, cfdata_t 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(device_t parent, device_t self, void *aux) 104 { 105 struct pconssoftc *sc = device_private(self); 106 sc->of_dev = self; 107 108 printf("\n"); 109 if (!pconsprobe()) 110 return; 111 112 cn_init_magic(&pcons_cnm_state); 113 cn_set_magic("+++++"); 114 callout_init(&sc->sc_poll_ch, 0); 115 } 116 117 static void pconsstart(struct tty *); 118 static int pconsparam(struct tty *, struct termios *); 119 static void pcons_poll(void *); 120 121 int 122 pconsopen(dev_t dev, int flag, int mode, struct lwp *l) 123 { 124 struct pconssoftc *sc; 125 struct tty *tp; 126 struct proc *p; 127 128 p = l->l_proc; 129 130 sc = device_lookup_private(&pcons_cd, minor(dev)); 131 if (!sc) 132 return ENXIO; 133 if (!(tp = sc->of_tty)) 134 sc->of_tty = tp = tty_alloc(); 135 tp->t_oproc = pconsstart; 136 tp->t_param = pconsparam; 137 tp->t_dev = dev; 138 cn_tab->cn_dev = dev; 139 if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) 140 return (EBUSY); 141 if (!(tp->t_state & TS_ISOPEN)) { 142 ttychars(tp); 143 tp->t_iflag = TTYDEF_IFLAG; 144 tp->t_oflag = TTYDEF_OFLAG; 145 tp->t_cflag = TTYDEF_CFLAG; 146 tp->t_lflag = TTYDEF_LFLAG; 147 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 148 pconsparam(tp, &tp->t_termios); 149 ttsetwater(tp); 150 } 151 tp->t_state |= TS_CARR_ON; 152 153 if (!(sc->of_flags & OFPOLL)) { 154 sc->of_flags |= OFPOLL; 155 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 156 } 157 158 return (*tp->t_linesw->l_open)(dev, tp); 159 } 160 161 int 162 pconsclose(dev_t dev, int flag, int mode, struct lwp *l) 163 { 164 struct pconssoftc *sc = device_lookup_private(&pcons_cd,minor(dev)); 165 struct tty *tp = sc->of_tty; 166 167 callout_stop(&sc->sc_poll_ch); 168 sc->of_flags &= ~OFPOLL; 169 (*tp->t_linesw->l_close)(tp, flag); 170 ttyclose(tp); 171 return 0; 172 } 173 174 int 175 pconsread(dev_t dev, struct uio *uio, int flag) 176 { 177 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 178 struct tty *tp = sc->of_tty; 179 180 return (*tp->t_linesw->l_read)(tp, uio, flag); 181 } 182 183 int 184 pconswrite(dev_t dev, struct uio *uio, int flag) 185 { 186 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 187 struct tty *tp = sc->of_tty; 188 189 return (*tp->t_linesw->l_write)(tp, uio, flag); 190 } 191 192 int 193 pconspoll(dev_t dev, int events, struct lwp *l) 194 { 195 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 196 struct tty *tp = sc->of_tty; 197 198 return ((*tp->t_linesw->l_poll)(tp, events, l)); 199 } 200 201 int 202 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 203 { 204 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 205 struct tty *tp = sc->of_tty; 206 int error; 207 208 if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH) 209 return error; 210 return ttioctl(tp, cmd, data, flag, l); 211 } 212 213 struct tty * 214 pconstty(dev_t dev) 215 { 216 struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev)); 217 218 return sc->of_tty; 219 } 220 221 static void 222 pconsstart(struct tty *tp) 223 { 224 struct clist *cl; 225 int s, len; 226 u_char buf[OFBURSTLEN]; 227 228 s = spltty(); 229 if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) { 230 splx(s); 231 return; 232 } 233 tp->t_state |= TS_BUSY; 234 splx(s); 235 cl = &tp->t_outq; 236 len = q_to_b(cl, buf, OFBURSTLEN); 237 prom_write(prom_stdout(), buf, len); 238 s = spltty(); 239 tp->t_state &= ~TS_BUSY; 240 if (ttypull(tp)) { 241 tp->t_state |= TS_TIMEOUT; 242 callout_schedule(&tp->t_rstrt_ch, 1); 243 } 244 splx(s); 245 } 246 247 static int 248 pconsparam(struct tty *tp, struct termios *t) 249 { 250 tp->t_ispeed = t->c_ispeed; 251 tp->t_ospeed = t->c_ospeed; 252 tp->t_cflag = t->c_cflag; 253 return 0; 254 } 255 256 static void 257 pcons_poll(void *aux) 258 { 259 struct pconssoftc *sc = aux; 260 struct tty *tp = sc->of_tty; 261 char ch; 262 263 while (prom_read(prom_stdin(), &ch, 1) > 0) { 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 return (prom_stdin() && prom_stdout()); 276 } 277 278 void 279 pcons_cnpollc(dev_t dev, int on) 280 { 281 struct pconssoftc *sc; 282 283 sc = device_lookup_private(&pcons_cd, minor(dev)); 284 if (sc == NULL) 285 return; 286 287 if (on) { 288 if (sc->of_flags & OFPOLL) 289 callout_stop(&sc->sc_poll_ch); 290 sc->of_flags &= ~OFPOLL; 291 } else { 292 /* Resuming kernel. */ 293 if (!(sc->of_flags & OFPOLL)) { 294 sc->of_flags |= OFPOLL; 295 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc); 296 } 297 } 298 } 299 300 void pcons_dopoll(void); 301 void 302 pcons_dopoll(void) 303 { 304 pcons_poll(device_lookup_private(&pcons_cd, 0)); 305 } 306