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pcons.c revision 1.1 
      1 /*	$NetBSD: pcons.c,v 1.1 2002/03/22 00:22:44 fredette 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 "opt_ddb.h"
     37 
     38 #include <sys/param.h>
     39 #include <sys/systm.h>
     40 #include <sys/conf.h>
     41 #include <sys/device.h>
     42 #include <sys/file.h>
     43 #include <sys/ioctl.h>
     44 #include <sys/kernel.h>
     45 #include <sys/proc.h>
     46 #include <sys/tty.h>
     47 #include <sys/time.h>
     48 #include <sys/syslog.h>
     49 
     50 #include <machine/autoconf.h>
     51 #include <machine/promlib.h>
     52 #include <machine/conf.h>
     53 #include <machine/cpu.h>
     54 #include <machine/psl.h>
     55 
     56 #include <dev/cons.h>
     57 
     58 #include <sun2/dev/cons.h>
     59 
     60 static int pconsmatch __P((struct device *, struct cfdata *, void *));
     61 static void pconsattach __P((struct device *, struct device *, void *));
     62 
     63 struct cfattach pcons_ca = {
     64 	sizeof(struct pconssoftc), pconsmatch, pconsattach
     65 };
     66 
     67 extern struct cfdriver pcons_cd;
     68 static struct cnm_state pcons_cnm_state;
     69 
     70 static int pconsprobe __P((void));
     71 extern struct consdev *cn_tab;
     72 
     73 static int
     74 pconsmatch(parent, match, aux)
     75 	struct device *parent;
     76 	struct cfdata *match;
     77 	void *aux;
     78 {
     79 	struct mainbus_attach_args *ma = aux;
     80 	extern int  prom_cngetc __P((dev_t));
     81 
     82 	/* Only attach if no other console has attached. */
     83 	return ((ma->ma_name != NULL) &&
     84 		(strcmp("pcons", ma->ma_name) == 0) &&
     85 		(cn_tab->cn_getc == prom_cngetc));
     86 
     87 }
     88 
     89 static void
     90 pconsattach(parent, self, aux)
     91 	struct device *parent, *self;
     92 	void *aux;
     93 {
     94 	struct pconssoftc *sc = (struct pconssoftc *) self;
     95 
     96 	printf("\n");
     97 	if (!pconsprobe())
     98 		return;
     99 
    100 	cn_init_magic(&pcons_cnm_state);
    101 	cn_set_magic("+++++");
    102 	callout_init(&sc->sc_poll_ch);
    103 }
    104 
    105 static void pconsstart __P((struct tty *));
    106 static int pconsparam __P((struct tty *, struct termios *));
    107 static void pcons_poll __P((void *));
    108 
    109 int
    110 pconsopen(dev, flag, mode, p)
    111 	dev_t dev;
    112 	int flag, mode;
    113 	struct proc *p;
    114 {
    115 	struct pconssoftc *sc;
    116 	int unit = minor(dev);
    117 	struct tty *tp;
    118 
    119 	if (unit >= pcons_cd.cd_ndevs)
    120 		return ENXIO;
    121 	sc = pcons_cd.cd_devs[unit];
    122 	if (!sc)
    123 		return ENXIO;
    124 	if (!(tp = sc->of_tty))
    125 		sc->of_tty = tp = ttymalloc();
    126 	tp->t_oproc = pconsstart;
    127 	tp->t_param = pconsparam;
    128 	tp->t_dev = dev;
    129 	cn_tab->cn_dev = dev;
    130 	if (!(tp->t_state & TS_ISOPEN)) {
    131 		ttychars(tp);
    132 		tp->t_iflag = TTYDEF_IFLAG;
    133 		tp->t_oflag = TTYDEF_OFLAG;
    134 		tp->t_cflag = TTYDEF_CFLAG;
    135 		tp->t_lflag = TTYDEF_LFLAG;
    136 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    137 		pconsparam(tp, &tp->t_termios);
    138 		ttsetwater(tp);
    139 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    140 		return EBUSY;
    141 	tp->t_state |= TS_CARR_ON;
    142 
    143 	if (!(sc->of_flags & OFPOLL)) {
    144 		sc->of_flags |= OFPOLL;
    145 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    146 	}
    147 
    148 	return (*tp->t_linesw->l_open)(dev, tp);
    149 }
    150 
    151 int
    152 pconsclose(dev, flag, mode, p)
    153 	dev_t dev;
    154 	int flag, mode;
    155 	struct proc *p;
    156 {
    157 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    158 	struct tty *tp = sc->of_tty;
    159 
    160 	callout_stop(&sc->sc_poll_ch);
    161 	sc->of_flags &= ~OFPOLL;
    162 	(*tp->t_linesw->l_close)(tp, flag);
    163 	ttyclose(tp);
    164 	return 0;
    165 }
    166 
    167 int
    168 pconsread(dev, uio, flag)
    169 	dev_t dev;
    170 	struct uio *uio;
    171 	int flag;
    172 {
    173 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    174 	struct tty *tp = sc->of_tty;
    175 
    176 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    177 }
    178 
    179 int
    180 pconswrite(dev, uio, flag)
    181 	dev_t dev;
    182 	struct uio *uio;
    183 	int flag;
    184 {
    185 	struct pconssoftc *sc = pcons_cd.cd_devs[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, events, p)
    193 	dev_t dev;
    194 	int events;
    195 	struct proc *p;
    196 {
    197 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    198 	struct tty *tp = sc->of_tty;
    199 
    200 	return ((*tp->t_linesw->l_poll)(tp, events, p));
    201 }
    202 
    203 int
    204 pconsioctl(dev, cmd, data, flag, p)
    205 	dev_t dev;
    206 	u_long cmd;
    207 	caddr_t data;
    208 	int flag;
    209 	struct proc *p;
    210 {
    211 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    212 	struct tty *tp = sc->of_tty;
    213 	int error;
    214 
    215 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p)) >= 0)
    216 		return error;
    217 	if ((error = ttioctl(tp, cmd, data, flag, p)) >= 0)
    218 		return error;
    219 	return ENOTTY;
    220 }
    221 
    222 struct tty *
    223 pconstty(dev)
    224 	dev_t dev;
    225 {
    226 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    227 
    228 	return sc->of_tty;
    229 }
    230 
    231 void
    232 pconsstop(tp, flag)
    233 	struct tty *tp;
    234 	int flag;
    235 {
    236 }
    237 
    238 static void
    239 pconsstart(tp)
    240 	struct tty *tp;
    241 {
    242 	struct clist *cl;
    243 	int s, len;
    244 	u_char buf[OFBURSTLEN];
    245 
    246 	s = spltty();
    247 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    248 		splx(s);
    249 		return;
    250 	}
    251 	tp->t_state |= TS_BUSY;
    252 	splx(s);
    253 	cl = &tp->t_outq;
    254 	len = q_to_b(cl, buf, OFBURSTLEN);
    255 	prom_putstr(buf, len);
    256 	s = spltty();
    257 	tp->t_state &= ~TS_BUSY;
    258 	if (cl->c_cc) {
    259 		tp->t_state |= TS_TIMEOUT;
    260 		callout_reset(&tp->t_rstrt_ch, 1, ttrstrt, (void *)tp);
    261 	}
    262 	if (cl->c_cc <= tp->t_lowat) {
    263 		if (tp->t_state & TS_ASLEEP) {
    264 			tp->t_state &= ~TS_ASLEEP;
    265 			wakeup(cl);
    266 		}
    267 		selwakeup(&tp->t_wsel);
    268 	}
    269 	splx(s);
    270 }
    271 
    272 static int
    273 pconsparam(tp, t)
    274 	struct tty *tp;
    275 	struct termios *t;
    276 {
    277 	tp->t_ispeed = t->c_ispeed;
    278 	tp->t_ospeed = t->c_ospeed;
    279 	tp->t_cflag = t->c_cflag;
    280 	return 0;
    281 }
    282 
    283 static void
    284 pcons_poll(aux)
    285 	void *aux;
    286 {
    287 	struct pconssoftc *sc = aux;
    288 	struct tty *tp = sc->of_tty;
    289 	int c;
    290 	char ch;
    291 
    292 	while ((c = prom_peekchar()) >= 0) {
    293 		ch = c;
    294 		cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
    295 		if (tp && (tp->t_state & TS_ISOPEN))
    296 			(*tp->t_linesw->l_rint)(ch, tp);
    297 	}
    298 	callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    299 }
    300 
    301 int
    302 pconsprobe()
    303 {
    304 	switch (prom_version()) {
    305 #ifdef	PROM_OLDMON
    306 	case PROM_OLDMON:
    307 	case PROM_OBP_V0:
    308 		return (1);
    309 #endif	/* PROM_OLDMON */
    310 #ifdef	PROM_OBP_V2
    311 	case PROM_OBP_V2:
    312 	case PROM_OBP_V3:
    313 	case PROM_OPENFIRM:
    314 		return (prom_stdin() && prom_stdout());
    315 #endif	/* PROM_OBP_V2 */
    316 	default: break;
    317 	}
    318 	return (0);
    319 }
    320 
    321 void
    322 pcons_cnpollc(dev, on)
    323 	dev_t dev;
    324 	int on;
    325 {
    326 	struct pconssoftc *sc = NULL;
    327 
    328 	if (pcons_cd.cd_devs)
    329 		sc = pcons_cd.cd_devs[minor(dev)];
    330 
    331 	if (on) {
    332 		if (!sc) return;
    333 		if (sc->of_flags & OFPOLL)
    334 			callout_stop(&sc->sc_poll_ch);
    335 		sc->of_flags &= ~OFPOLL;
    336 	} else {
    337                 /* Resuming kernel. */
    338 		if (sc && !(sc->of_flags & OFPOLL)) {
    339 			sc->of_flags |= OFPOLL;
    340 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    341 		}
    342 	}
    343 }
    344 
    345 void pcons_dopoll __P((void));
    346 void
    347 pcons_dopoll() {
    348 		pcons_poll((void*)pcons_cd.cd_devs[0]);
    349 }
    350