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pcons.c revision 1.7 
      1 /*	$NetBSD: pcons.c,v 1.7 2003/07/15 03:36:12 lukem 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 1.7 2003/07/15 03:36:12 lukem 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 __P((struct device *, struct cfdata *, void *));
     63 static void pconsattach __P((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 __P((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(parent, match, aux)
     89 	struct device *parent;
     90 	struct cfdata *match;
     91 	void *aux;
     92 {
     93 	struct mainbus_attach_args *ma = aux;
     94 	extern int  prom_cngetc __P((dev_t));
     95 
     96 	/* Only attach if no other console has attached. */
     97 	return ((ma->ma_name != NULL) &&
     98 		(strcmp("pcons", ma->ma_name) == 0) &&
     99 		(cn_tab->cn_getc == prom_cngetc));
    100 
    101 }
    102 
    103 static void
    104 pconsattach(parent, self, aux)
    105 	struct device *parent, *self;
    106 	void *aux;
    107 {
    108 	struct pconssoftc *sc = (struct pconssoftc *) self;
    109 
    110 	printf("\n");
    111 	if (!pconsprobe())
    112 		return;
    113 
    114 	cn_init_magic(&pcons_cnm_state);
    115 	cn_set_magic("+++++");
    116 	callout_init(&sc->sc_poll_ch);
    117 }
    118 
    119 static void pconsstart __P((struct tty *));
    120 static int pconsparam __P((struct tty *, struct termios *));
    121 static void pcons_poll __P((void *));
    122 
    123 int
    124 pconsopen(dev, flag, mode, p)
    125 	dev_t dev;
    126 	int flag, mode;
    127 	struct proc *p;
    128 {
    129 	struct pconssoftc *sc;
    130 	int unit = minor(dev);
    131 	struct tty *tp;
    132 
    133 	if (unit >= pcons_cd.cd_ndevs)
    134 		return ENXIO;
    135 	sc = pcons_cd.cd_devs[unit];
    136 	if (!sc)
    137 		return ENXIO;
    138 	if (!(tp = sc->of_tty))
    139 		sc->of_tty = tp = ttymalloc();
    140 	tp->t_oproc = pconsstart;
    141 	tp->t_param = pconsparam;
    142 	tp->t_dev = dev;
    143 	cn_tab->cn_dev = dev;
    144 	if (!(tp->t_state & TS_ISOPEN)) {
    145 		ttychars(tp);
    146 		tp->t_iflag = TTYDEF_IFLAG;
    147 		tp->t_oflag = TTYDEF_OFLAG;
    148 		tp->t_cflag = TTYDEF_CFLAG;
    149 		tp->t_lflag = TTYDEF_LFLAG;
    150 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    151 		pconsparam(tp, &tp->t_termios);
    152 		ttsetwater(tp);
    153 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    154 		return EBUSY;
    155 	tp->t_state |= TS_CARR_ON;
    156 
    157 	if (!(sc->of_flags & OFPOLL)) {
    158 		sc->of_flags |= OFPOLL;
    159 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    160 	}
    161 
    162 	return (*tp->t_linesw->l_open)(dev, tp);
    163 }
    164 
    165 int
    166 pconsclose(dev, flag, mode, p)
    167 	dev_t dev;
    168 	int flag, mode;
    169 	struct proc *p;
    170 {
    171 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    172 	struct tty *tp = sc->of_tty;
    173 
    174 	callout_stop(&sc->sc_poll_ch);
    175 	sc->of_flags &= ~OFPOLL;
    176 	(*tp->t_linesw->l_close)(tp, flag);
    177 	ttyclose(tp);
    178 	return 0;
    179 }
    180 
    181 int
    182 pconsread(dev, uio, flag)
    183 	dev_t dev;
    184 	struct uio *uio;
    185 	int flag;
    186 {
    187 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    188 	struct tty *tp = sc->of_tty;
    189 
    190 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    191 }
    192 
    193 int
    194 pconswrite(dev, uio, flag)
    195 	dev_t dev;
    196 	struct uio *uio;
    197 	int flag;
    198 {
    199 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    200 	struct tty *tp = sc->of_tty;
    201 
    202 	return (*tp->t_linesw->l_write)(tp, uio, flag);
    203 }
    204 
    205 int
    206 pconspoll(dev, events, p)
    207 	dev_t dev;
    208 	int events;
    209 	struct proc *p;
    210 {
    211 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    212 	struct tty *tp = sc->of_tty;
    213 
    214 	return ((*tp->t_linesw->l_poll)(tp, events, p));
    215 }
    216 
    217 int
    218 pconsioctl(dev, cmd, data, flag, p)
    219 	dev_t dev;
    220 	u_long cmd;
    221 	caddr_t data;
    222 	int flag;
    223 	struct proc *p;
    224 {
    225 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    226 	struct tty *tp = sc->of_tty;
    227 	int error;
    228 
    229 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p)) >= 0)
    230 		return error;
    231 	if ((error = ttioctl(tp, cmd, data, flag, p)) >= 0)
    232 		return error;
    233 	return ENOTTY;
    234 }
    235 
    236 struct tty *
    237 pconstty(dev)
    238 	dev_t dev;
    239 {
    240 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    241 
    242 	return sc->of_tty;
    243 }
    244 
    245 static void
    246 pconsstart(tp)
    247 	struct tty *tp;
    248 {
    249 	struct clist *cl;
    250 	int s, len;
    251 	u_char buf[OFBURSTLEN];
    252 
    253 	s = spltty();
    254 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    255 		splx(s);
    256 		return;
    257 	}
    258 	tp->t_state |= TS_BUSY;
    259 	splx(s);
    260 	cl = &tp->t_outq;
    261 	len = q_to_b(cl, buf, OFBURSTLEN);
    262 	prom_putstr(buf, len);
    263 	s = spltty();
    264 	tp->t_state &= ~TS_BUSY;
    265 	if (cl->c_cc) {
    266 		tp->t_state |= TS_TIMEOUT;
    267 		callout_reset(&tp->t_rstrt_ch, 1, ttrstrt, (void *)tp);
    268 	}
    269 	if (cl->c_cc <= tp->t_lowat) {
    270 		if (tp->t_state & TS_ASLEEP) {
    271 			tp->t_state &= ~TS_ASLEEP;
    272 			wakeup(cl);
    273 		}
    274 		selwakeup(&tp->t_wsel);
    275 	}
    276 	splx(s);
    277 }
    278 
    279 static int
    280 pconsparam(tp, t)
    281 	struct tty *tp;
    282 	struct termios *t;
    283 {
    284 	tp->t_ispeed = t->c_ispeed;
    285 	tp->t_ospeed = t->c_ospeed;
    286 	tp->t_cflag = t->c_cflag;
    287 	return 0;
    288 }
    289 
    290 static void
    291 pcons_poll(aux)
    292 	void *aux;
    293 {
    294 	struct pconssoftc *sc = aux;
    295 	struct tty *tp = sc->of_tty;
    296 	int c;
    297 	char ch;
    298 
    299 	while ((c = prom_peekchar()) >= 0) {
    300 		ch = c;
    301 		cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
    302 		if (tp && (tp->t_state & TS_ISOPEN))
    303 			(*tp->t_linesw->l_rint)(ch, tp);
    304 	}
    305 	callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    306 }
    307 
    308 int
    309 pconsprobe()
    310 {
    311 	switch (prom_version()) {
    312 #ifdef	PROM_OLDMON
    313 	case PROM_OLDMON:
    314 	case PROM_OBP_V0:
    315 		return (1);
    316 #endif	/* PROM_OLDMON */
    317 #ifdef	PROM_OBP_V2
    318 	case PROM_OBP_V2:
    319 	case PROM_OBP_V3:
    320 	case PROM_OPENFIRM:
    321 		return (prom_stdin() && prom_stdout());
    322 #endif	/* PROM_OBP_V2 */
    323 	default: break;
    324 	}
    325 	return (0);
    326 }
    327 
    328 void
    329 pcons_cnpollc(dev, on)
    330 	dev_t dev;
    331 	int on;
    332 {
    333 	struct pconssoftc *sc = NULL;
    334 
    335 	if (pcons_cd.cd_devs)
    336 		sc = pcons_cd.cd_devs[minor(dev)];
    337 
    338 	if (on) {
    339 		if (!sc) return;
    340 		if (sc->of_flags & OFPOLL)
    341 			callout_stop(&sc->sc_poll_ch);
    342 		sc->of_flags &= ~OFPOLL;
    343 	} else {
    344                 /* Resuming kernel. */
    345 		if (sc && !(sc->of_flags & OFPOLL)) {
    346 			sc->of_flags |= OFPOLL;
    347 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    348 		}
    349 	}
    350 }
    351 
    352 void pcons_dopoll __P((void));
    353 void
    354 pcons_dopoll() {
    355 		pcons_poll((void*)pcons_cd.cd_devs[0]);
    356 }
    357