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pcons.c revision 1.13 
      1 /*	$NetBSD: pcons.c,v 1.13 2002/10/02 16:02:18 thorpej 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/openfirm.h>
     52 #include <machine/cpu.h>
     53 #include <machine/eeprom.h>
     54 #include <machine/psl.h>
     55 
     56 #include <dev/cons.h>
     57 
     58 #include <sparc64/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 CFATTACH_DECL(pcons, sizeof(struct pconssoftc),
     64     pconsmatch, pconsattach, NULL, NULL);
     65 
     66 extern struct cfdriver pcons_cd;
     67 
     68 dev_type_open(pconsopen);
     69 dev_type_close(pconsclose);
     70 dev_type_read(pconsread);
     71 dev_type_write(pconswrite);
     72 dev_type_ioctl(pconsioctl);
     73 dev_type_tty(pconstty);
     74 dev_type_poll(pconspoll);
     75 
     76 const struct cdevsw pcons_cdevsw = {
     77 	pconsopen, pconsclose, pconsread, pconswrite, pconsioctl,
     78 	nostop, pconstty, pconspoll, nommap, D_TTY
     79 };
     80 
     81 static struct cnm_state pcons_cnm_state;
     82 
     83 static int pconsprobe __P((void));
     84 extern struct consdev *cn_tab;
     85 
     86 static int
     87 pconsmatch(parent, match, aux)
     88 	struct device *parent;
     89 	struct cfdata *match;
     90 	void *aux;
     91 {
     92 	struct mainbus_attach_args *ma = aux;
     93 	extern int  prom_cngetc __P((dev_t));
     94 
     95 	/* Only attach if no other console has attached. */
     96 	return ((strcmp("pcons", ma->ma_name) == 0) &&
     97 		(cn_tab->cn_getc == prom_cngetc));
     98 
     99 }
    100 
    101 static void
    102 pconsattach(parent, self, aux)
    103 	struct device *parent, *self;
    104 	void *aux;
    105 {
    106 	struct pconssoftc *sc = (struct pconssoftc *) self;
    107 
    108 	printf("\n");
    109 	if (!pconsprobe())
    110 		return;
    111 
    112 	cn_init_magic(&pcons_cnm_state);
    113 	cn_set_magic("+++++");
    114 	callout_init(&sc->sc_poll_ch);
    115 }
    116 
    117 static void pconsstart __P((struct tty *));
    118 static int pconsparam __P((struct tty *, struct termios *));
    119 static void pcons_poll __P((void *));
    120 
    121 int
    122 pconsopen(dev, flag, mode, p)
    123 	dev_t dev;
    124 	int flag, mode;
    125 	struct proc *p;
    126 {
    127 	struct pconssoftc *sc;
    128 	int unit = minor(dev);
    129 	struct tty *tp;
    130 
    131 	if (unit >= pcons_cd.cd_ndevs)
    132 		return ENXIO;
    133 	sc = pcons_cd.cd_devs[unit];
    134 	if (!sc)
    135 		return ENXIO;
    136 	if (!(tp = sc->of_tty))
    137 		sc->of_tty = tp = ttymalloc();
    138 	tp->t_oproc = pconsstart;
    139 	tp->t_param = pconsparam;
    140 	tp->t_dev = dev;
    141 	cn_tab->cn_dev = dev;
    142 	if (!(tp->t_state & TS_ISOPEN)) {
    143 		ttychars(tp);
    144 		tp->t_iflag = TTYDEF_IFLAG;
    145 		tp->t_oflag = TTYDEF_OFLAG;
    146 		tp->t_cflag = TTYDEF_CFLAG;
    147 		tp->t_lflag = TTYDEF_LFLAG;
    148 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    149 		pconsparam(tp, &tp->t_termios);
    150 		ttsetwater(tp);
    151 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    152 		return EBUSY;
    153 	tp->t_state |= TS_CARR_ON;
    154 
    155 	if (!(sc->of_flags & OFPOLL)) {
    156 		sc->of_flags |= OFPOLL;
    157 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    158 	}
    159 
    160 	return (*tp->t_linesw->l_open)(dev, tp);
    161 }
    162 
    163 int
    164 pconsclose(dev, flag, mode, p)
    165 	dev_t dev;
    166 	int flag, mode;
    167 	struct proc *p;
    168 {
    169 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    170 	struct tty *tp = sc->of_tty;
    171 
    172 	callout_stop(&sc->sc_poll_ch);
    173 	sc->of_flags &= ~OFPOLL;
    174 	(*tp->t_linesw->l_close)(tp, flag);
    175 	ttyclose(tp);
    176 	return 0;
    177 }
    178 
    179 int
    180 pconsread(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_read)(tp, uio, flag);
    189 }
    190 
    191 int
    192 pconswrite(dev, uio, flag)
    193 	dev_t dev;
    194 	struct uio *uio;
    195 	int flag;
    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_write)(tp, uio, flag);
    201 }
    202 
    203 int
    204 pconspoll(dev, events, p)
    205 	dev_t dev;
    206 	int events;
    207 	struct proc *p;
    208 {
    209 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    210 	struct tty *tp = sc->of_tty;
    211 
    212 	return ((*tp->t_linesw->l_poll)(tp, events, p));
    213 }
    214 
    215 int
    216 pconsioctl(dev, cmd, data, flag, p)
    217 	dev_t dev;
    218 	u_long cmd;
    219 	caddr_t data;
    220 	int flag;
    221 	struct proc *p;
    222 {
    223 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    224 	struct tty *tp = sc->of_tty;
    225 	int error;
    226 
    227 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p)) != EPASSTHROUGH)
    228 		return error;
    229 	return ttioctl(tp, cmd, data, flag, p);
    230 }
    231 
    232 struct tty *
    233 pconstty(dev)
    234 	dev_t dev;
    235 {
    236 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    237 
    238 	return sc->of_tty;
    239 }
    240 
    241 static void
    242 pconsstart(tp)
    243 	struct tty *tp;
    244 {
    245 	struct clist *cl;
    246 	int s, len;
    247 	u_char buf[OFBURSTLEN];
    248 
    249 	s = spltty();
    250 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    251 		splx(s);
    252 		return;
    253 	}
    254 	tp->t_state |= TS_BUSY;
    255 	splx(s);
    256 	cl = &tp->t_outq;
    257 	len = q_to_b(cl, buf, OFBURSTLEN);
    258 	OF_write(stdout, buf, len);
    259 	s = spltty();
    260 	tp->t_state &= ~TS_BUSY;
    261 	if (cl->c_cc) {
    262 		tp->t_state |= TS_TIMEOUT;
    263 		callout_reset(&tp->t_rstrt_ch, 1, ttrstrt, (void *)tp);
    264 	}
    265 	if (cl->c_cc <= tp->t_lowat) {
    266 		if (tp->t_state & TS_ASLEEP) {
    267 			tp->t_state &= ~TS_ASLEEP;
    268 			wakeup(cl);
    269 		}
    270 		selwakeup(&tp->t_wsel);
    271 	}
    272 	splx(s);
    273 }
    274 
    275 static int
    276 pconsparam(tp, t)
    277 	struct tty *tp;
    278 	struct termios *t;
    279 {
    280 	tp->t_ispeed = t->c_ispeed;
    281 	tp->t_ospeed = t->c_ospeed;
    282 	tp->t_cflag = t->c_cflag;
    283 	return 0;
    284 }
    285 
    286 static void
    287 pcons_poll(aux)
    288 	void *aux;
    289 {
    290 	struct pconssoftc *sc = aux;
    291 	struct tty *tp = sc->of_tty;
    292 	char ch;
    293 
    294 	while (OF_read(stdin, &ch, 1) > 0) {
    295 		cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
    296 		if (tp && (tp->t_state & TS_ISOPEN))
    297 			(*tp->t_linesw->l_rint)(ch, tp);
    298 	}
    299 	callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    300 }
    301 
    302 int
    303 pconsprobe()
    304 {
    305 	if (!stdin) stdin = OF_stdin();
    306 	if (!stdout) stdout = OF_stdout();
    307 
    308 	return (stdin && stdout);
    309 }
    310 
    311 void
    312 pcons_cnpollc(dev, on)
    313 	dev_t dev;
    314 	int on;
    315 {
    316 	struct pconssoftc *sc = NULL;
    317 
    318 	if (pcons_cd.cd_devs)
    319 		sc = pcons_cd.cd_devs[minor(dev)];
    320 
    321 	if (on) {
    322 		if (!sc) return;
    323 		if (sc->of_flags & OFPOLL)
    324 			callout_stop(&sc->sc_poll_ch);
    325 		sc->of_flags &= ~OFPOLL;
    326 	} else {
    327                 /* Resuming kernel. */
    328 		if (sc && !(sc->of_flags & OFPOLL)) {
    329 			sc->of_flags |= OFPOLL;
    330 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    331 		}
    332 	}
    333 }
    334 
    335 void pcons_dopoll __P((void));
    336 void
    337 pcons_dopoll() {
    338 		pcons_poll((void*)pcons_cd.cd_devs[0]);
    339 }
    340