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ofcons.c revision 1.7 
      1 /*	$NetBSD: ofcons.c,v 1.7 1998/01/26 21:49:00 cgd 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/tty.h>
     40 
     41 #include <dev/cons.h>
     42 
     43 #include <dev/ofw/openfirm.h>
     44 
     45 struct ofc_softc {
     46 	struct device of_dev;
     47 	struct tty *of_tty;
     48 	int of_flags;
     49 };
     50 /* flags: */
     51 #define	OFPOLL		1
     52 
     53 #define	OFBURSTLEN	128	/* max number of bytes to write in one chunk */
     54 
     55 static int stdin, stdout;
     56 
     57 static int ofcmatch __P((struct device *, struct cfdata *, void *));
     58 static void ofcattach __P((struct device *, struct device *, void *));
     59 
     60 struct cfattach ofcons_ca = {
     61 	sizeof(struct ofc_softc), ofcmatch, ofcattach
     62 };
     63 
     64 extern struct cfdriver ofcons_cd;
     65 
     66 static int ofcprobe __P((void));
     67 
     68 static int
     69 ofcmatch(parent, match, aux)
     70 	struct device *parent;
     71 	struct cfdata *match;
     72 	void *aux;
     73 {
     74 	struct ofprobe *ofp = aux;
     75 
     76 	if (!ofcprobe())
     77 		return 0;
     78 	return OF_instance_to_package(stdin) == ofp->phandle
     79 		|| OF_instance_to_package(stdout) == ofp->phandle;
     80 }
     81 
     82 static void
     83 ofcattach(parent, self, aux)
     84 	struct device *parent, *self;
     85 	void *aux;
     86 {
     87 	printf("\n");
     88 }
     89 
     90 static void ofcstart __P((struct tty *));
     91 static int ofcparam __P((struct tty *, struct termios *));
     92 static void ofcpoll __P((void *));
     93 
     94 int
     95 ofcopen(dev, flag, mode, p)
     96 	dev_t dev;
     97 	int flag, mode;
     98 	struct proc *p;
     99 {
    100 	struct ofc_softc *sc;
    101 	int unit = minor(dev);
    102 	struct tty *tp;
    103 
    104 	if (unit >= ofcons_cd.cd_ndevs)
    105 		return ENXIO;
    106 	sc = ofcons_cd.cd_devs[unit];
    107 	if (!sc)
    108 		return ENXIO;
    109 	if (!(tp = sc->of_tty))
    110 		sc->of_tty = tp = ttymalloc();
    111 	tp->t_oproc = ofcstart;
    112 	tp->t_param = ofcparam;
    113 	tp->t_dev = dev;
    114 	if (!(tp->t_state & TS_ISOPEN)) {
    115 		tp->t_state |= TS_WOPEN;
    116 		ttychars(tp);
    117 		tp->t_iflag = TTYDEF_IFLAG;
    118 		tp->t_oflag = TTYDEF_OFLAG;
    119 		tp->t_cflag = TTYDEF_CFLAG;
    120 		tp->t_lflag = TTYDEF_LFLAG;
    121 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    122 		ofcparam(tp, &tp->t_termios);
    123 		ttsetwater(tp);
    124 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    125 		return EBUSY;
    126 	tp->t_state |= TS_CARR_ON;
    127 
    128 	if (!(sc->of_flags & OFPOLL)) {
    129 		sc->of_flags |= OFPOLL;
    130 		timeout(ofcpoll, sc, 1);
    131 	}
    132 
    133 	return (*linesw[tp->t_line].l_open)(dev, tp);
    134 }
    135 
    136 int
    137 ofcclose(dev, flag, mode, p)
    138 	dev_t dev;
    139 	int flag, mode;
    140 	struct proc *p;
    141 {
    142 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    143 	struct tty *tp = sc->of_tty;
    144 
    145 	untimeout(ofcpoll, sc);
    146 	sc->of_flags &= ~OFPOLL;
    147 	(*linesw[tp->t_line].l_close)(tp, flag);
    148 	ttyclose(tp);
    149 	return 0;
    150 }
    151 
    152 int
    153 ofcread(dev, uio, flag)
    154 	dev_t dev;
    155 	struct uio *uio;
    156 	int flag;
    157 {
    158 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    159 	struct tty *tp = sc->of_tty;
    160 
    161 	return (*linesw[tp->t_line].l_read)(tp, uio, flag);
    162 }
    163 
    164 int
    165 ofcwrite(dev, uio, flag)
    166 	dev_t dev;
    167 	struct uio *uio;
    168 	int flag;
    169 {
    170 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    171 	struct tty *tp = sc->of_tty;
    172 
    173 	return (*linesw[tp->t_line].l_write)(tp, uio, flag);
    174 }
    175 
    176 int
    177 ofcioctl(dev, cmd, data, flag, p)
    178 	dev_t dev;
    179 	u_long cmd;
    180 	caddr_t data;
    181 	int flag;
    182 	struct proc *p;
    183 {
    184 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    185 	struct tty *tp = sc->of_tty;
    186 	int error;
    187 
    188 	if ((error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p)) >= 0)
    189 		return error;
    190 	if ((error = ttioctl(tp, cmd, data, flag, p)) >= 0)
    191 		return error;
    192 	return ENOTTY;
    193 }
    194 
    195 struct tty *
    196 ofctty(dev)
    197 	dev_t dev;
    198 {
    199 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    200 
    201 	return sc->of_tty;
    202 }
    203 
    204 void
    205 ofcstop(tp, flag)
    206 	struct tty *tp;
    207 	int flag;
    208 {
    209 }
    210 
    211 static void
    212 ofcstart(tp)
    213 	struct tty *tp;
    214 {
    215 	struct clist *cl;
    216 	int s, len;
    217 	u_char buf[OFBURSTLEN];
    218 
    219 	s = spltty();
    220 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    221 		splx(s);
    222 		return;
    223 	}
    224 	tp->t_state |= TS_BUSY;
    225 	splx(s);
    226 	cl = &tp->t_outq;
    227 	len = q_to_b(cl, buf, OFBURSTLEN);
    228 	OF_write(stdout, buf, len);
    229 	s = spltty();
    230 	tp->t_state &= ~TS_BUSY;
    231 	if (cl->c_cc) {
    232 		tp->t_state |= TS_TIMEOUT;
    233 		timeout(ttrstrt, (void *)tp, 1);
    234 	}
    235 	if (cl->c_cc <= tp->t_lowat) {
    236 		if (tp->t_state & TS_ASLEEP) {
    237 			tp->t_state &= ~TS_ASLEEP;
    238 			wakeup(cl);
    239 		}
    240 		selwakeup(&tp->t_wsel);
    241 	}
    242 	splx(s);
    243 }
    244 
    245 static int
    246 ofcparam(tp, t)
    247 	struct tty *tp;
    248 	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 ofcpoll(aux)
    258 	void *aux;
    259 {
    260 	struct ofc_softc *sc = aux;
    261 	struct tty *tp = sc->of_tty;
    262 	char ch;
    263 
    264 	while (OF_read(stdin, &ch, 1) > 0) {
    265 		if (tp && (tp->t_state & TS_ISOPEN))
    266 			(*linesw[tp->t_line].l_rint)(ch, tp);
    267 	}
    268 	timeout(ofcpoll, sc, 1);
    269 }
    270 
    271 static int
    272 ofcprobe()
    273 {
    274 	int chosen;
    275 	char stdinbuf[4], stdoutbuf[4];
    276 
    277 	if (stdin)
    278 		return 1;
    279 	if ((chosen = OF_finddevice("/chosen")) == -1)
    280 		return 0;
    281 	if (OF_getprop(chosen, "stdin", stdinbuf, sizeof stdinbuf) !=
    282 	      sizeof stdinbuf ||
    283 	    OF_getprop(chosen, "stdout", stdoutbuf, sizeof stdoutbuf) !=
    284 	      sizeof stdoutbuf)
    285 		return 0;
    286 
    287 	/* Decode properties. */
    288 	stdin = of_decode_int(stdinbuf);
    289 	stdout = of_decode_int(stdoutbuf);
    290 
    291 	return 1;
    292 }
    293 
    294 void
    295 ofccnprobe(cd)
    296 	struct consdev *cd;
    297 {
    298 	int maj;
    299 
    300 	if (!ofcprobe())
    301 		return;
    302 
    303 	for (maj = 0; maj < nchrdev; maj++)
    304 		if (cdevsw[maj].d_open == ofcopen)
    305 			break;
    306 	cd->cn_dev = makedev(maj, 0);
    307 	cd->cn_pri = CN_INTERNAL;
    308 }
    309 
    310 void
    311 ofccninit(cd)
    312 	struct consdev *cd;
    313 {
    314 }
    315 
    316 int
    317 ofccngetc(dev)
    318 	dev_t dev;
    319 {
    320 	unsigned char ch = '\0';
    321 	int l;
    322 
    323 	while ((l = OF_read(stdin, &ch, 1)) != 1)
    324 		if (l != -2 && l != 0)
    325 			return -1;
    326 	return ch;
    327 }
    328 
    329 void
    330 ofccnputc(dev, c)
    331 	dev_t dev;
    332 	int c;
    333 {
    334 	char ch = c;
    335 
    336 	OF_write(stdout, &ch, 1);
    337 }
    338 
    339 void
    340 ofccnpollc(dev, on)
    341 	dev_t dev;
    342 	int on;
    343 {
    344 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    345 
    346 	if (!sc)
    347 		return;
    348 	if (on) {
    349 		if (sc->of_flags & OFPOLL)
    350 			untimeout(ofcpoll, sc);
    351 		sc->of_flags &= ~OFPOLL;
    352 	} else {
    353 		if (!(sc->of_flags & OFPOLL)) {
    354 			sc->of_flags |= OFPOLL;
    355 			timeout(ofcpoll, sc, 1);
    356 		}
    357 	}
    358 }
    359