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pcons.c revision 1.6.4.1 
      1 /*	$NetBSD: pcons.c,v 1.6.4.1 2001/06/21 19:35:42 nathanw 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/bsd_openprom.h>
     53 #include <machine/conf.h>
     54 #include <machine/cpu.h>
     55 #include <machine/eeprom.h>
     56 #include <machine/psl.h>
     57 
     58 #include <dev/cons.h>
     59 
     60 #include <sparc64/dev/cons.h>
     61 
     62 static int pconsmatch __P((struct device *, struct cfdata *, void *));
     63 static void pconsattach __P((struct device *, struct device *, void *));
     64 
     65 struct cfattach pcons_ca = {
     66 	sizeof(struct pconssoftc), pconsmatch, pconsattach
     67 };
     68 
     69 extern struct cfdriver pcons_cd;
     70 static struct cnm_state pcons_cnm_state;
     71 
     72 static int pconsprobe __P((void));
     73 extern struct consdev *cn_tab;
     74 
     75 static int
     76 pconsmatch(parent, match, aux)
     77 	struct device *parent;
     78 	struct cfdata *match;
     79 	void *aux;
     80 {
     81 	struct mainbus_attach_args *ma = aux;
     82 	extern int  prom_cngetc __P((dev_t));
     83 
     84 	/* Only attach if no other console has attached. */
     85 	return ((strcmp("pcons", ma->ma_name) == 0) &&
     86 		(cn_tab->cn_getc == prom_cngetc));
     87 
     88 }
     89 
     90 static void
     91 pconsattach(parent, self, aux)
     92 	struct device *parent, *self;
     93 	void *aux;
     94 {
     95 	struct pconssoftc *sc = (struct pconssoftc *) self;
     96 
     97 	printf("\n");
     98 	if (!pconsprobe())
     99 		return;
    100 
    101 	cn_init_magic(&pcons_cnm_state);
    102 	cn_set_magic("+++++");
    103 	callout_init(&sc->sc_poll_ch);
    104 }
    105 
    106 static void pconsstart __P((struct tty *));
    107 static int pconsparam __P((struct tty *, struct termios *));
    108 static void pcons_poll __P((void *));
    109 
    110 int
    111 pconsopen(dev, flag, mode, p)
    112 	dev_t dev;
    113 	int flag, mode;
    114 	struct proc *p;
    115 {
    116 	struct pconssoftc *sc;
    117 	int unit = minor(dev);
    118 	struct tty *tp;
    119 
    120 	if (unit >= pcons_cd.cd_ndevs)
    121 		return ENXIO;
    122 	sc = pcons_cd.cd_devs[unit];
    123 	if (!sc)
    124 		return ENXIO;
    125 	if (!(tp = sc->of_tty))
    126 		sc->of_tty = tp = ttymalloc();
    127 	tp->t_oproc = pconsstart;
    128 	tp->t_param = pconsparam;
    129 	tp->t_dev = dev;
    130 	cn_tab->cn_dev = dev;
    131 	if (!(tp->t_state & TS_ISOPEN)) {
    132 		ttychars(tp);
    133 		tp->t_iflag = TTYDEF_IFLAG;
    134 		tp->t_oflag = TTYDEF_OFLAG;
    135 		tp->t_cflag = TTYDEF_CFLAG;
    136 		tp->t_lflag = TTYDEF_LFLAG;
    137 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    138 		pconsparam(tp, &tp->t_termios);
    139 		ttsetwater(tp);
    140 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    141 		return EBUSY;
    142 	tp->t_state |= TS_CARR_ON;
    143 
    144 	if (!(sc->of_flags & OFPOLL)) {
    145 		sc->of_flags |= OFPOLL;
    146 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    147 	}
    148 
    149 	return (*tp->t_linesw->l_open)(dev, tp);
    150 }
    151 
    152 int
    153 pconsclose(dev, flag, mode, p)
    154 	dev_t dev;
    155 	int flag, mode;
    156 	struct proc *p;
    157 {
    158 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    159 	struct tty *tp = sc->of_tty;
    160 
    161 	callout_stop(&sc->sc_poll_ch);
    162 	sc->of_flags &= ~OFPOLL;
    163 	(*tp->t_linesw->l_close)(tp, flag);
    164 	ttyclose(tp);
    165 	return 0;
    166 }
    167 
    168 int
    169 pconsread(dev, uio, flag)
    170 	dev_t dev;
    171 	struct uio *uio;
    172 	int flag;
    173 {
    174 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    175 	struct tty *tp = sc->of_tty;
    176 
    177 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    178 }
    179 
    180 int
    181 pconswrite(dev, uio, flag)
    182 	dev_t dev;
    183 	struct uio *uio;
    184 	int flag;
    185 {
    186 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    187 	struct tty *tp = sc->of_tty;
    188 
    189 	return (*tp->t_linesw->l_write)(tp, uio, flag);
    190 }
    191 
    192 int
    193 pconspoll(dev, events, p)
    194 	dev_t dev;
    195 	int events;
    196 	struct proc *p;
    197 {
    198 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    199 	struct tty *tp = sc->of_tty;
    200 
    201 	return ((*tp->t_linesw->l_poll)(tp, events, p));
    202 }
    203 
    204 int
    205 pconsioctl(dev, cmd, data, flag, p)
    206 	dev_t dev;
    207 	u_long cmd;
    208 	caddr_t data;
    209 	int flag;
    210 	struct proc *p;
    211 {
    212 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    213 	struct tty *tp = sc->of_tty;
    214 	int error;
    215 
    216 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p)) >= 0)
    217 		return error;
    218 	if ((error = ttioctl(tp, cmd, data, flag, p)) >= 0)
    219 		return error;
    220 	return ENOTTY;
    221 }
    222 
    223 struct tty *
    224 pconstty(dev)
    225 	dev_t dev;
    226 {
    227 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    228 
    229 	return sc->of_tty;
    230 }
    231 
    232 void
    233 pconsstop(tp, flag)
    234 	struct tty *tp;
    235 	int flag;
    236 {
    237 }
    238 
    239 static void
    240 pconsstart(tp)
    241 	struct tty *tp;
    242 {
    243 	struct clist *cl;
    244 	int s, len;
    245 	u_char buf[OFBURSTLEN];
    246 
    247 	s = spltty();
    248 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    249 		splx(s);
    250 		return;
    251 	}
    252 	tp->t_state |= TS_BUSY;
    253 	splx(s);
    254 	cl = &tp->t_outq;
    255 	len = q_to_b(cl, buf, OFBURSTLEN);
    256 	OF_write(stdout, buf, len);
    257 	s = spltty();
    258 	tp->t_state &= ~TS_BUSY;
    259 	if (cl->c_cc) {
    260 		tp->t_state |= TS_TIMEOUT;
    261 		callout_reset(&tp->t_rstrt_ch, 1, ttrstrt, (void *)tp);
    262 	}
    263 	if (cl->c_cc <= tp->t_lowat) {
    264 		if (tp->t_state & TS_ASLEEP) {
    265 			tp->t_state &= ~TS_ASLEEP;
    266 			wakeup(cl);
    267 		}
    268 		selwakeup(&tp->t_wsel);
    269 	}
    270 	splx(s);
    271 }
    272 
    273 static int
    274 pconsparam(tp, t)
    275 	struct tty *tp;
    276 	struct termios *t;
    277 {
    278 	tp->t_ispeed = t->c_ispeed;
    279 	tp->t_ospeed = t->c_ospeed;
    280 	tp->t_cflag = t->c_cflag;
    281 	return 0;
    282 }
    283 
    284 static void
    285 pcons_poll(aux)
    286 	void *aux;
    287 {
    288 	struct pconssoftc *sc = aux;
    289 	struct tty *tp = sc->of_tty;
    290 	char ch;
    291 
    292 	while (OF_read(stdin, &ch, 1) > 0) {
    293 		cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
    294 		if (tp && (tp->t_state & TS_ISOPEN))
    295 			(*tp->t_linesw->l_rint)(ch, tp);
    296 	}
    297 	callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    298 }
    299 
    300 int
    301 pconsprobe()
    302 {
    303 	if (!stdin) stdin = OF_stdin();
    304 	if (!stdout) stdout = OF_stdout();
    305 
    306 	return (stdin && stdout);
    307 }
    308 
    309 void
    310 pcons_cnpollc(dev, on)
    311 	dev_t dev;
    312 	int on;
    313 {
    314 	struct pconssoftc *sc = NULL;
    315 
    316 	if (pcons_cd.cd_devs)
    317 		sc = pcons_cd.cd_devs[minor(dev)];
    318 
    319 	if (on) {
    320 		if (!sc) return;
    321 		if (sc->of_flags & OFPOLL)
    322 			callout_stop(&sc->sc_poll_ch);
    323 		sc->of_flags &= ~OFPOLL;
    324 	} else {
    325                 /* Resuming kernel. */
    326 		if (sc && !(sc->of_flags & OFPOLL)) {
    327 			sc->of_flags |= OFPOLL;
    328 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    329 		}
    330 	}
    331 }
    332 
    333 void pcons_dopoll __P((void));
    334 void
    335 pcons_dopoll() {
    336 		pcons_poll((void*)pcons_cd.cd_devs[0]);
    337 }
    338