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ofcons.c revision 1.14 
      1 /*	$NetBSD: ofcons.c,v 1.14 2001/08/25 19:05:04 matt Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
      5  * Copyright (C) 1995, 1996 TooLs GmbH.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by TooLs GmbH.
     19  * 4. The name of TooLs GmbH may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     28  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     30  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     31  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/param.h>
     35 #include <sys/conf.h>
     36 #include <sys/device.h>
     37 #include <sys/proc.h>
     38 #include <sys/systm.h>
     39 #include <sys/callout.h>
     40 #include <sys/tty.h>
     41 
     42 #include <dev/cons.h>
     43 
     44 #include <dev/ofw/openfirm.h>
     45 
     46 struct ofcons_softc {
     47 	struct device of_dev;
     48 	struct tty *of_tty;
     49 	struct callout sc_poll_ch;
     50 	int of_flags;
     51 };
     52 /* flags: */
     53 #define	OFPOLL		1
     54 
     55 #define	OFBURSTLEN	128	/* max number of bytes to write in one chunk */
     56 
     57 cdev_decl(ofcons_);
     58 cons_decl(ofcons_);
     59 
     60 static int stdin, stdout;
     61 
     62 static int ofcons_match __P((struct device *, struct cfdata *, void *));
     63 static void ofcons_attach __P((struct device *, struct device *, void *));
     64 
     65 struct cfattach ofcons_ca = {
     66 	sizeof(struct ofcons_softc), ofcons_match, ofcons_attach
     67 };
     68 
     69 extern struct cfdriver ofcons_cd;
     70 
     71 static int ofcons_probe __P((void));
     72 
     73 static int
     74 ofcons_match(parent, match, aux)
     75 	struct device *parent;
     76 	struct cfdata *match;
     77 	void *aux;
     78 {
     79 	struct ofbus_attach_args *oba = aux;
     80 
     81 	if (strcmp(oba->oba_busname, "ofw"))
     82 		return (0);
     83 	if (!ofcons_probe())
     84 		return 0;
     85 	return OF_instance_to_package(stdin) == oba->oba_phandle
     86 		|| OF_instance_to_package(stdout) == oba->oba_phandle;
     87 }
     88 
     89 static void
     90 ofcons_attach(parent, self, aux)
     91 	struct device *parent, *self;
     92 	void *aux;
     93 {
     94 	struct ofcons_softc *sc = (struct ofcons_softc *) self;
     95 
     96 	printf("\n");
     97 
     98 	callout_init(&sc->sc_poll_ch);
     99 }
    100 
    101 static void ofcons_start __P((struct tty *));
    102 static int ofcons_param __P((struct tty *, struct termios *));
    103 static void ofcons_pollin __P((void *));
    104 
    105 int
    106 ofcons_open(dev, flag, mode, p)
    107 	dev_t dev;
    108 	int flag, mode;
    109 	struct proc *p;
    110 {
    111 	struct ofcons_softc *sc;
    112 	int unit = minor(dev);
    113 	struct tty *tp;
    114 
    115 	if (unit >= ofcons_cd.cd_ndevs)
    116 		return ENXIO;
    117 	sc = ofcons_cd.cd_devs[unit];
    118 	if (!sc)
    119 		return ENXIO;
    120 	if (!(tp = sc->of_tty))
    121 		sc->of_tty = tp = ttymalloc();
    122 	tp->t_oproc = ofcons_start;
    123 	tp->t_param = ofcons_param;
    124 	tp->t_dev = dev;
    125 	if (!(tp->t_state & TS_ISOPEN)) {
    126 		ttychars(tp);
    127 		tp->t_iflag = TTYDEF_IFLAG;
    128 		tp->t_oflag = TTYDEF_OFLAG;
    129 		tp->t_cflag = TTYDEF_CFLAG;
    130 		tp->t_lflag = TTYDEF_LFLAG;
    131 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    132 		ofcons_param(tp, &tp->t_termios);
    133 		ttsetwater(tp);
    134 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    135 		return EBUSY;
    136 	tp->t_state |= TS_CARR_ON;
    137 
    138 	if (!(sc->of_flags & OFPOLL)) {
    139 		sc->of_flags |= OFPOLL;
    140 		callout_reset(&sc->sc_poll_ch, 1, ofcons_pollin, sc);
    141 	}
    142 
    143 	return (*tp->t_linesw->l_open)(dev, tp);
    144 }
    145 
    146 int
    147 ofcons_close(dev, flag, mode, p)
    148 	dev_t dev;
    149 	int flag, mode;
    150 	struct proc *p;
    151 {
    152 	struct ofcons_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    153 	struct tty *tp = sc->of_tty;
    154 
    155 	callout_stop(&sc->sc_poll_ch);
    156 	sc->of_flags &= ~OFPOLL;
    157 	(*tp->t_linesw->l_close)(tp, flag);
    158 	ttyclose(tp);
    159 	return 0;
    160 }
    161 
    162 int
    163 ofcons_read(dev, uio, flag)
    164 	dev_t dev;
    165 	struct uio *uio;
    166 	int flag;
    167 {
    168 	struct ofcons_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    169 	struct tty *tp = sc->of_tty;
    170 
    171 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    172 }
    173 
    174 int
    175 ofcons_write(dev, uio, flag)
    176 	dev_t dev;
    177 	struct uio *uio;
    178 	int flag;
    179 {
    180 	struct ofcons_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    181 	struct tty *tp = sc->of_tty;
    182 
    183 	return (*tp->t_linesw->l_write)(tp, uio, flag);
    184 }
    185 
    186 int
    187 ofcons_poll(dev, events, p)
    188 	dev_t dev;
    189 	int events;
    190 	struct proc *p;
    191 {
    192 	struct ofcons_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    193 	struct tty *tp = sc->of_tty;
    194 
    195 	return ((*tp->t_linesw->l_poll)(tp, events, p));
    196 }
    197 int
    198 ofcons_ioctl(dev, cmd, data, flag, p)
    199 	dev_t dev;
    200 	u_long cmd;
    201 	caddr_t data;
    202 	int flag;
    203 	struct proc *p;
    204 {
    205 	struct ofcons_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    206 	struct tty *tp = sc->of_tty;
    207 	int error;
    208 
    209 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p)) >= 0)
    210 		return error;
    211 	if ((error = ttioctl(tp, cmd, data, flag, p)) >= 0)
    212 		return error;
    213 	return ENOTTY;
    214 }
    215 
    216 struct tty *
    217 ofcons_tty(dev)
    218 	dev_t dev;
    219 {
    220 	struct ofcons_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    221 
    222 	return sc->of_tty;
    223 }
    224 
    225 void
    226 ofcons_stop(tp, flag)
    227 	struct tty *tp;
    228 	int flag;
    229 {
    230 }
    231 
    232 static void
    233 ofcons_start(tp)
    234 	struct tty *tp;
    235 {
    236 	struct clist *cl;
    237 	int s, len;
    238 	u_char buf[OFBURSTLEN];
    239 
    240 	s = spltty();
    241 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    242 		splx(s);
    243 		return;
    244 	}
    245 	tp->t_state |= TS_BUSY;
    246 	splx(s);
    247 	cl = &tp->t_outq;
    248 	len = q_to_b(cl, buf, OFBURSTLEN);
    249 	OF_write(stdout, buf, len);
    250 	s = spltty();
    251 	tp->t_state &= ~TS_BUSY;
    252 	if (cl->c_cc) {
    253 		tp->t_state |= TS_TIMEOUT;
    254 		callout_reset(&tp->t_rstrt_ch, 1, ttrstrt, (void *)tp);
    255 	}
    256 	if (cl->c_cc <= tp->t_lowat) {
    257 		if (tp->t_state & TS_ASLEEP) {
    258 			tp->t_state &= ~TS_ASLEEP;
    259 			wakeup(cl);
    260 		}
    261 		selwakeup(&tp->t_wsel);
    262 	}
    263 	splx(s);
    264 }
    265 
    266 static int
    267 ofcons_param(tp, t)
    268 	struct tty *tp;
    269 	struct termios *t;
    270 {
    271 	tp->t_ispeed = t->c_ispeed;
    272 	tp->t_ospeed = t->c_ospeed;
    273 	tp->t_cflag = t->c_cflag;
    274 	return 0;
    275 }
    276 
    277 static void
    278 ofcons_pollin(aux)
    279 	void *aux;
    280 {
    281 	struct ofcons_softc *sc = aux;
    282 	struct tty *tp = sc->of_tty;
    283 	char ch;
    284 
    285 	while (OF_read(stdin, &ch, 1) > 0) {
    286 		if (tp && (tp->t_state & TS_ISOPEN))
    287 			(*tp->t_linesw->l_rint)(ch, tp);
    288 	}
    289 	callout_reset(&sc->sc_poll_ch, 1, ofcons_pollin, sc);
    290 }
    291 
    292 static int
    293 ofcons_probe()
    294 {
    295 	int chosen;
    296 	char stdinbuf[4], stdoutbuf[4];
    297 
    298 	if (stdin)
    299 		return 1;
    300 	if ((chosen = OF_finddevice("/chosen")) == -1)
    301 		return 0;
    302 	if (OF_getprop(chosen, "stdin", stdinbuf, sizeof stdinbuf) !=
    303 	      sizeof stdinbuf ||
    304 	    OF_getprop(chosen, "stdout", stdoutbuf, sizeof stdoutbuf) !=
    305 	      sizeof stdoutbuf)
    306 		return 0;
    307 
    308 	/* Decode properties. */
    309 	stdin = of_decode_int(stdinbuf);
    310 	stdout = of_decode_int(stdoutbuf);
    311 
    312 	return 1;
    313 }
    314 
    315 void
    316 ofcons_cnprobe(cd)
    317 	struct consdev *cd;
    318 {
    319 	int maj;
    320 
    321 	if (!ofcons_probe())
    322 		return;
    323 
    324 	for (maj = 0; maj < nchrdev; maj++)
    325 		if (cdevsw[maj].d_open == ofcons_open)
    326 			break;
    327 	cd->cn_dev = makedev(maj, 0);
    328 	cd->cn_pri = CN_INTERNAL;
    329 }
    330 
    331 void
    332 ofcons_cninit(cd)
    333 	struct consdev *cd;
    334 {
    335 }
    336 
    337 int
    338 ofcons_cngetc(dev)
    339 	dev_t dev;
    340 {
    341 	unsigned char ch = '\0';
    342 	int l;
    343 
    344 	while ((l = OF_read(stdin, &ch, 1)) != 1)
    345 		if (l != -2 && l != 0)
    346 			return -1;
    347 	return ch;
    348 }
    349 
    350 void
    351 ofcons_cnputc(dev, c)
    352 	dev_t dev;
    353 	int c;
    354 {
    355 	char ch = c;
    356 
    357 	OF_write(stdout, &ch, 1);
    358 }
    359 
    360 void
    361 ofcons_cnpollc(dev, on)
    362 	dev_t dev;
    363 	int on;
    364 {
    365 	struct ofcons_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    366 
    367 	if (!sc)
    368 		return;
    369 	if (on) {
    370 		if (sc->of_flags & OFPOLL)
    371 			callout_stop(&sc->sc_poll_ch);
    372 		sc->of_flags &= ~OFPOLL;
    373 	} else {
    374 		if (!(sc->of_flags & OFPOLL)) {
    375 			sc->of_flags |= OFPOLL;
    376 			callout_reset(&sc->sc_poll_ch, 1, ofcons_pollin, sc);
    377 		}
    378 	}
    379 }
    380