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ofcons.c revision 1.3 
      1 /*	$NetBSD: ofcons.c,v 1.3 1996/10/13 01:38:11 christos 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 *, void *, 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 	void *match, *aux;
     74 {
     75 	struct ofprobe *ofp = aux;
     76 
     77 	if (!ofcprobe())
     78 		return 0;
     79 	return OF_instance_to_package(stdin) == ofp->phandle
     80 		|| OF_instance_to_package(stdout) == ofp->phandle;
     81 }
     82 
     83 static void
     84 ofcattach(parent, self, aux)
     85 	struct device *parent, *self;
     86 	void *aux;
     87 {
     88 	printf("\n");
     89 }
     90 
     91 static void ofcstart __P((struct tty *));
     92 static int ofcparam __P((struct tty *, struct termios *));
     93 static void ofcpoll __P((void *));
     94 
     95 int
     96 ofcopen(dev, flag, mode, p)
     97 	dev_t dev;
     98 	int flag, mode;
     99 	struct proc *p;
    100 {
    101 	struct ofc_softc *sc;
    102 	int unit = minor(dev);
    103 	struct tty *tp;
    104 
    105 	if (unit >= ofcons_cd.cd_ndevs)
    106 		return ENXIO;
    107 	sc = ofcons_cd.cd_devs[unit];
    108 	if (!sc)
    109 		return ENXIO;
    110 	if (!(tp = sc->of_tty))
    111 		sc->of_tty = tp = ttymalloc();
    112 	tp->t_oproc = ofcstart;
    113 	tp->t_param = ofcparam;
    114 	tp->t_dev = dev;
    115 	if (!(tp->t_state & TS_ISOPEN)) {
    116 		tp->t_state |= TS_WOPEN;
    117 		ttychars(tp);
    118 		tp->t_iflag = TTYDEF_IFLAG;
    119 		tp->t_oflag = TTYDEF_OFLAG;
    120 		tp->t_cflag = TTYDEF_CFLAG;
    121 		tp->t_lflag = TTYDEF_LFLAG;
    122 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    123 		ofcparam(tp, &tp->t_termios);
    124 		ttsetwater(tp);
    125 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    126 		return EBUSY;
    127 	tp->t_state |= TS_CARR_ON;
    128 
    129 	if (!(sc->of_flags & OFPOLL)) {
    130 		sc->of_flags |= OFPOLL;
    131 		timeout(ofcpoll, sc, 1);
    132 	}
    133 
    134 	return (*linesw[tp->t_line].l_open)(dev, tp);
    135 }
    136 
    137 int
    138 ofcclose(dev, flag, mode, p)
    139 	dev_t dev;
    140 	int flag, mode;
    141 	struct proc *p;
    142 {
    143 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    144 	struct tty *tp = sc->of_tty;
    145 
    146 	untimeout(ofcpoll, sc);
    147 	sc->of_flags &= ~OFPOLL;
    148 	(*linesw[tp->t_line].l_close)(tp, flag);
    149 	ttyclose(tp);
    150 	return 0;
    151 }
    152 
    153 int
    154 ofcread(dev, uio, flag)
    155 	dev_t dev;
    156 	struct uio *uio;
    157 	int flag;
    158 {
    159 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    160 	struct tty *tp = sc->of_tty;
    161 
    162 	return (*linesw[tp->t_line].l_read)(tp, uio, flag);
    163 }
    164 
    165 int
    166 ofcwrite(dev, uio, flag)
    167 	dev_t dev;
    168 	struct uio *uio;
    169 	int flag;
    170 {
    171 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    172 	struct tty *tp = sc->of_tty;
    173 
    174 	return (*linesw[tp->t_line].l_write)(tp, uio, flag);
    175 }
    176 
    177 int
    178 ofcioctl(dev, cmd, data, flag, p)
    179 	dev_t dev;
    180 	u_long cmd;
    181 	caddr_t data;
    182 	int flag;
    183 	struct proc *p;
    184 {
    185 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    186 	struct tty *tp = sc->of_tty;
    187 	int error;
    188 
    189 	if ((error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p)) >= 0)
    190 		return error;
    191 	if ((error = ttioctl(tp, cmd, data, flag, p)) >= 0)
    192 		return error;
    193 	return ENOTTY;
    194 }
    195 
    196 struct tty *
    197 ofctty(dev)
    198 	dev_t dev;
    199 {
    200 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    201 
    202 	return sc->of_tty;
    203 }
    204 
    205 void
    206 ofcstop(tp, flag)
    207 	struct tty *tp;
    208 	int flag;
    209 {
    210 }
    211 
    212 static void
    213 ofcstart(tp)
    214 	struct tty *tp;
    215 {
    216 	struct clist *cl;
    217 	int s, len;
    218 	u_char buf[OFBURSTLEN];
    219 
    220 	s = spltty();
    221 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    222 		splx(s);
    223 		return;
    224 	}
    225 	tp->t_state |= TS_BUSY;
    226 	splx(s);
    227 	cl = &tp->t_outq;
    228 	len = q_to_b(cl, buf, OFBURSTLEN);
    229 	OF_write(stdout, buf, len);
    230 	s = spltty();
    231 	tp->t_state &= ~TS_BUSY;
    232 	if (cl->c_cc) {
    233 		tp->t_state |= TS_TIMEOUT;
    234 		timeout(ttrstrt, (void *)tp, 1);
    235 	}
    236 	if (cl->c_cc <= tp->t_lowat) {
    237 		if (tp->t_state & TS_ASLEEP) {
    238 			tp->t_state &= ~TS_ASLEEP;
    239 			wakeup(cl);
    240 		}
    241 		selwakeup(&tp->t_wsel);
    242 	}
    243 	splx(s);
    244 }
    245 
    246 static int
    247 ofcparam(tp, t)
    248 	struct tty *tp;
    249 	struct termios *t;
    250 {
    251 	tp->t_ispeed = t->c_ispeed;
    252 	tp->t_ospeed = t->c_ospeed;
    253 	tp->t_cflag = t->c_cflag;
    254 	return 0;
    255 }
    256 
    257 static void
    258 ofcpoll(aux)
    259 	void *aux;
    260 {
    261 	struct ofc_softc *sc = aux;
    262 	struct tty *tp = sc->of_tty;
    263 	char ch;
    264 
    265 	while (OF_read(stdin, &ch, 1) > 0) {
    266 		if (tp && (tp->t_state & TS_ISOPEN))
    267 			(*linesw[tp->t_line].l_rint)(ch, tp);
    268 	}
    269 	timeout(ofcpoll, sc, 1);
    270 }
    271 
    272 static int
    273 ofcprobe()
    274 {
    275 	int chosen;
    276 
    277 	if (stdin)
    278 		return 1;
    279 	if ((chosen = OF_finddevice("/chosen")) == -1)
    280 		return 0;
    281 	if (OF_getprop(chosen, "stdin", &stdin, sizeof stdin) != sizeof stdin
    282 	    || OF_getprop(chosen, "stdout", &stdout, sizeof stdout) != sizeof stdout)
    283 		return 0;
    284 	return 1;
    285 }
    286 
    287 void
    288 ofccnprobe(cd)
    289 	struct consdev *cd;
    290 {
    291 	int maj;
    292 
    293 	if (!ofcprobe())
    294 		return;
    295 
    296 	for (maj = 0; maj < nchrdev; maj++)
    297 		if (cdevsw[maj].d_open == ofcopen)
    298 			break;
    299 	cd->cn_dev = makedev(maj, 0);
    300 	cd->cn_pri = CN_INTERNAL;
    301 }
    302 
    303 void
    304 ofccninit(cd)
    305 	struct consdev *cd;
    306 {
    307 }
    308 
    309 int
    310 ofccngetc(dev)
    311 	dev_t dev;
    312 {
    313 	unsigned char ch;
    314 	int l;
    315 
    316 	while ((l = OF_read(stdin, &ch, 1)) != 1)
    317 		if (l != -2)
    318 			return -1;
    319 	return ch;
    320 }
    321 
    322 void
    323 ofccnputc(dev, c)
    324 	dev_t dev;
    325 	int c;
    326 {
    327 	char ch = c;
    328 
    329 	OF_write(stdout, &ch, 1);
    330 }
    331 
    332 void
    333 ofccnpollc(dev, on)
    334 	dev_t dev;
    335 	int on;
    336 {
    337 	struct ofc_softc *sc = ofcons_cd.cd_devs[minor(dev)];
    338 
    339 	if (!sc)
    340 		return;
    341 	if (on) {
    342 		if (sc->of_flags & OFPOLL)
    343 			untimeout(ofcpoll, sc);
    344 		sc->of_flags &= ~OFPOLL;
    345 	} else {
    346 		if (!(sc->of_flags & OFPOLL)) {
    347 			sc->of_flags |= OFPOLL;
    348 			timeout(ofcpoll, sc, 1);
    349 		}
    350 	}
    351 }
    352