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ofcons.c revision 1.4 
      1 /*	$NetBSD: ofcons.c,v 1.4 1997/04/16 23:32:56 thorpej 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 struct cfdriver ofcons_cd = {
     65 	NULL, "ofcons", DV_TTY
     66 };
     67 
     68 static int ofcprobe __P((void));
     69 
     70 static int
     71 ofcmatch(parent, match, aux)
     72 	struct device *parent;
     73 	struct cfdata *match;
     74 	void *aux;
     75 {
     76 	struct ofprobe *ofp = aux;
     77 
     78 	if (!ofcprobe())
     79 		return 0;
     80 	return OF_instance_to_package(stdin) == ofp->phandle
     81 		|| OF_instance_to_package(stdout) == ofp->phandle;
     82 }
     83 
     84 static void
     85 ofcattach(parent, self, aux)
     86 	struct device *parent, *self;
     87 	void *aux;
     88 {
     89 	printf("\n");
     90 }
     91 
     92 static void ofcstart __P((struct tty *));
     93 static int ofcparam __P((struct tty *, struct termios *));
     94 static void ofcpoll __P((void *));
     95 
     96 int
     97 ofcopen(dev, flag, mode, p)
     98 	dev_t dev;
     99 	int flag, mode;
    100 	struct proc *p;
    101 {
    102 	struct ofc_softc *sc;
    103 	int unit = minor(dev);
    104 	struct tty *tp;
    105 
    106 	if (unit >= ofcons_cd.cd_ndevs)
    107 		return ENXIO;
    108 	sc = ofcons_cd.cd_devs[unit];
    109 	if (!sc)
    110 		return ENXIO;
    111 	if (!(tp = sc->of_tty))
    112 		sc->of_tty = tp = ttymalloc();
    113 	tp->t_oproc = ofcstart;
    114 	tp->t_param = ofcparam;
    115 	tp->t_dev = dev;
    116 	if (!(tp->t_state & TS_ISOPEN)) {
    117 		tp->t_state |= TS_WOPEN;
    118 		ttychars(tp);
    119 		tp->t_iflag = TTYDEF_IFLAG;
    120 		tp->t_oflag = TTYDEF_OFLAG;
    121 		tp->t_cflag = TTYDEF_CFLAG;
    122 		tp->t_lflag = TTYDEF_LFLAG;
    123 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    124 		ofcparam(tp, &tp->t_termios);
    125 		ttsetwater(tp);
    126 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    127 		return EBUSY;
    128 	tp->t_state |= TS_CARR_ON;
    129 
    130 	if (!(sc->of_flags & OFPOLL)) {
    131 		sc->of_flags |= OFPOLL;
    132 		timeout(ofcpoll, sc, 1);
    133 	}
    134 
    135 	return (*linesw[tp->t_line].l_open)(dev, tp);
    136 }
    137 
    138 int
    139 ofcclose(dev, flag, mode, p)
    140 	dev_t dev;
    141 	int flag, mode;
    142 	struct proc *p;
    143 {
    144 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    145 	struct tty *tp = sc->of_tty;
    146 
    147 	untimeout(ofcpoll, sc);
    148 	sc->of_flags &= ~OFPOLL;
    149 	(*linesw[tp->t_line].l_close)(tp, flag);
    150 	ttyclose(tp);
    151 	return 0;
    152 }
    153 
    154 int
    155 ofcread(dev, uio, flag)
    156 	dev_t dev;
    157 	struct uio *uio;
    158 	int flag;
    159 {
    160 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    161 	struct tty *tp = sc->of_tty;
    162 
    163 	return (*linesw[tp->t_line].l_read)(tp, uio, flag);
    164 }
    165 
    166 int
    167 ofcwrite(dev, uio, flag)
    168 	dev_t dev;
    169 	struct uio *uio;
    170 	int flag;
    171 {
    172 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    173 	struct tty *tp = sc->of_tty;
    174 
    175 	return (*linesw[tp->t_line].l_write)(tp, uio, flag);
    176 }
    177 
    178 int
    179 ofcioctl(dev, cmd, data, flag, p)
    180 	dev_t dev;
    181 	u_long cmd;
    182 	caddr_t data;
    183 	int flag;
    184 	struct proc *p;
    185 {
    186 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    187 	struct tty *tp = sc->of_tty;
    188 	int error;
    189 
    190 	if ((error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p)) >= 0)
    191 		return error;
    192 	if ((error = ttioctl(tp, cmd, data, flag, p)) >= 0)
    193 		return error;
    194 	return ENOTTY;
    195 }
    196 
    197 struct tty *
    198 ofctty(dev)
    199 	dev_t dev;
    200 {
    201 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    202 
    203 	return sc->of_tty;
    204 }
    205 
    206 void
    207 ofcstop(tp, flag)
    208 	struct tty *tp;
    209 	int flag;
    210 {
    211 }
    212 
    213 static void
    214 ofcstart(tp)
    215 	struct tty *tp;
    216 {
    217 	struct clist *cl;
    218 	int s, len;
    219 	u_char buf[OFBURSTLEN];
    220 
    221 	s = spltty();
    222 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    223 		splx(s);
    224 		return;
    225 	}
    226 	tp->t_state |= TS_BUSY;
    227 	splx(s);
    228 	cl = &tp->t_outq;
    229 	len = q_to_b(cl, buf, OFBURSTLEN);
    230 	OF_write(stdout, buf, len);
    231 	s = spltty();
    232 	tp->t_state &= ~TS_BUSY;
    233 	if (cl->c_cc) {
    234 		tp->t_state |= TS_TIMEOUT;
    235 		timeout(ttrstrt, (void *)tp, 1);
    236 	}
    237 	if (cl->c_cc <= tp->t_lowat) {
    238 		if (tp->t_state & TS_ASLEEP) {
    239 			tp->t_state &= ~TS_ASLEEP;
    240 			wakeup(cl);
    241 		}
    242 		selwakeup(&tp->t_wsel);
    243 	}
    244 	splx(s);
    245 }
    246 
    247 static int
    248 ofcparam(tp, t)
    249 	struct tty *tp;
    250 	struct termios *t;
    251 {
    252 	tp->t_ispeed = t->c_ispeed;
    253 	tp->t_ospeed = t->c_ospeed;
    254 	tp->t_cflag = t->c_cflag;
    255 	return 0;
    256 }
    257 
    258 static void
    259 ofcpoll(aux)
    260 	void *aux;
    261 {
    262 	struct ofc_softc *sc = aux;
    263 	struct tty *tp = sc->of_tty;
    264 	char ch;
    265 
    266 	while (OF_read(stdin, &ch, 1) > 0) {
    267 		if (tp && (tp->t_state & TS_ISOPEN))
    268 			(*linesw[tp->t_line].l_rint)(ch, tp);
    269 	}
    270 	timeout(ofcpoll, sc, 1);
    271 }
    272 
    273 static int
    274 ofcprobe()
    275 {
    276 	int chosen;
    277 
    278 	if (stdin)
    279 		return 1;
    280 	if ((chosen = OF_finddevice("/chosen")) == -1)
    281 		return 0;
    282 	if (OF_getprop(chosen, "stdin", &stdin, sizeof stdin) != sizeof stdin
    283 	    || OF_getprop(chosen, "stdout", &stdout, sizeof stdout) != sizeof stdout)
    284 		return 0;
    285 	return 1;
    286 }
    287 
    288 void
    289 ofccnprobe(cd)
    290 	struct consdev *cd;
    291 {
    292 	int maj;
    293 
    294 	if (!ofcprobe())
    295 		return;
    296 
    297 	for (maj = 0; maj < nchrdev; maj++)
    298 		if (cdevsw[maj].d_open == ofcopen)
    299 			break;
    300 	cd->cn_dev = makedev(maj, 0);
    301 	cd->cn_pri = CN_INTERNAL;
    302 }
    303 
    304 void
    305 ofccninit(cd)
    306 	struct consdev *cd;
    307 {
    308 }
    309 
    310 int
    311 ofccngetc(dev)
    312 	dev_t dev;
    313 {
    314 	unsigned char ch;
    315 	int l;
    316 
    317 	while ((l = OF_read(stdin, &ch, 1)) != 1)
    318 		if (l != -2)
    319 			return -1;
    320 	return ch;
    321 }
    322 
    323 void
    324 ofccnputc(dev, c)
    325 	dev_t dev;
    326 	int c;
    327 {
    328 	char ch = c;
    329 
    330 	OF_write(stdout, &ch, 1);
    331 }
    332 
    333 void
    334 ofccnpollc(dev, on)
    335 	dev_t dev;
    336 	int on;
    337 {
    338 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    339 
    340 	if (!sc)
    341 		return;
    342 	if (on) {
    343 		if (sc->of_flags & OFPOLL)
    344 			untimeout(ofcpoll, sc);
    345 		sc->of_flags &= ~OFPOLL;
    346 	} else {
    347 		if (!(sc->of_flags & OFPOLL)) {
    348 			sc->of_flags |= OFPOLL;
    349 			timeout(ofcpoll, sc, 1);
    350 		}
    351 	}
    352 }
    353