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pcons.c revision 1.8 
      1 /*	$NetBSD: pcons.c,v 1.8 2005/01/22 15:36:09 chs 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 <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: pcons.c,v 1.8 2005/01/22 15:36:09 chs Exp $");
     38 
     39 #include "opt_ddb.h"
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/conf.h>
     44 #include <sys/device.h>
     45 #include <sys/file.h>
     46 #include <sys/ioctl.h>
     47 #include <sys/kernel.h>
     48 #include <sys/proc.h>
     49 #include <sys/tty.h>
     50 #include <sys/time.h>
     51 #include <sys/syslog.h>
     52 
     53 #include <machine/autoconf.h>
     54 #include <machine/promlib.h>
     55 #include <machine/cpu.h>
     56 #include <machine/psl.h>
     57 
     58 #include <dev/cons.h>
     59 
     60 #include <sun2/dev/cons.h>
     61 
     62 static int pconsmatch(struct device *, struct cfdata *, void *);
     63 static void pconsattach(struct device *, struct device *, void *);
     64 
     65 CFATTACH_DECL(pcons, sizeof(struct pconssoftc),
     66     pconsmatch, pconsattach, NULL, NULL);
     67 
     68 extern struct cfdriver pcons_cd;
     69 static struct cnm_state pcons_cnm_state;
     70 
     71 static int pconsprobe(void);
     72 extern struct consdev *cn_tab;
     73 
     74 dev_type_open(pconsopen);
     75 dev_type_close(pconsclose);
     76 dev_type_read(pconsread);
     77 dev_type_write(pconswrite);
     78 dev_type_ioctl(pconsioctl);
     79 dev_type_tty(pconstty);
     80 dev_type_poll(pconspoll);
     81 
     82 const struct cdevsw pcons_cdevsw = {
     83 	pconsopen, pconsclose, pconsread, pconswrite, pconsioctl,
     84 	nostop, pconstty, pconspoll, nommap, ttykqfilter, D_TTY
     85 };
     86 
     87 static int
     88 pconsmatch(struct device *parent, struct cfdata *match, void *aux)
     89 {
     90 	struct mainbus_attach_args *ma = aux;
     91 	extern int  prom_cngetc(dev_t);
     92 
     93 	/* Only attach if no other console has attached. */
     94 	return ((ma->ma_name != NULL) &&
     95 		(strcmp("pcons", ma->ma_name) == 0) &&
     96 		(cn_tab->cn_getc == prom_cngetc));
     97 
     98 }
     99 
    100 static void
    101 pconsattach(struct device *parent, struct device *self, void *aux)
    102 {
    103 	struct pconssoftc *sc = (struct pconssoftc *) self;
    104 
    105 	printf("\n");
    106 	if (!pconsprobe())
    107 		return;
    108 
    109 	cn_init_magic(&pcons_cnm_state);
    110 	cn_set_magic("+++++");
    111 	callout_init(&sc->sc_poll_ch);
    112 }
    113 
    114 static void pconsstart(struct tty *);
    115 static int pconsparam(struct tty *, struct termios *);
    116 static void pcons_poll(void *);
    117 
    118 int
    119 pconsopen(dev_t dev, int flag, int mode, struct proc *p)
    120 {
    121 	struct pconssoftc *sc;
    122 	int unit = minor(dev);
    123 	struct tty *tp;
    124 
    125 	if (unit >= pcons_cd.cd_ndevs)
    126 		return ENXIO;
    127 	sc = pcons_cd.cd_devs[unit];
    128 	if (!sc)
    129 		return ENXIO;
    130 	if (!(tp = sc->of_tty))
    131 		sc->of_tty = tp = ttymalloc();
    132 	tp->t_oproc = pconsstart;
    133 	tp->t_param = pconsparam;
    134 	tp->t_dev = dev;
    135 	cn_tab->cn_dev = dev;
    136 	if (!(tp->t_state & TS_ISOPEN)) {
    137 		ttychars(tp);
    138 		tp->t_iflag = TTYDEF_IFLAG;
    139 		tp->t_oflag = TTYDEF_OFLAG;
    140 		tp->t_cflag = TTYDEF_CFLAG;
    141 		tp->t_lflag = TTYDEF_LFLAG;
    142 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    143 		pconsparam(tp, &tp->t_termios);
    144 		ttsetwater(tp);
    145 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    146 		return EBUSY;
    147 	tp->t_state |= TS_CARR_ON;
    148 
    149 	if (!(sc->of_flags & OFPOLL)) {
    150 		sc->of_flags |= OFPOLL;
    151 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    152 	}
    153 
    154 	return (*tp->t_linesw->l_open)(dev, tp);
    155 }
    156 
    157 int
    158 pconsclose(dev_t dev, int flag, int mode, struct proc *p)
    159 {
    160 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    161 	struct tty *tp = sc->of_tty;
    162 
    163 	callout_stop(&sc->sc_poll_ch);
    164 	sc->of_flags &= ~OFPOLL;
    165 	(*tp->t_linesw->l_close)(tp, flag);
    166 	ttyclose(tp);
    167 	return 0;
    168 }
    169 
    170 int
    171 pconsread(dev_t dev, struct uio *uio, int flag)
    172 {
    173 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    174 	struct tty *tp = sc->of_tty;
    175 
    176 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    177 }
    178 
    179 int
    180 pconswrite(dev_t dev, struct uio *uio, int flag)
    181 {
    182 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    183 	struct tty *tp = sc->of_tty;
    184 
    185 	return (*tp->t_linesw->l_write)(tp, uio, flag);
    186 }
    187 
    188 int
    189 pconspoll(dev_t dev, int events, struct proc *p)
    190 {
    191 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    192 	struct tty *tp = sc->of_tty;
    193 
    194 	return ((*tp->t_linesw->l_poll)(tp, events, p));
    195 }
    196 
    197 int
    198 pconsioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
    199 {
    200 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    201 	struct tty *tp = sc->of_tty;
    202 	int error;
    203 
    204 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p)) >= 0)
    205 		return error;
    206 	if ((error = ttioctl(tp, cmd, data, flag, p)) >= 0)
    207 		return error;
    208 	return ENOTTY;
    209 }
    210 
    211 struct tty *
    212 pconstty(dev_t dev)
    213 {
    214 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    215 
    216 	return sc->of_tty;
    217 }
    218 
    219 static void
    220 pconsstart(struct tty *tp)
    221 {
    222 	struct clist *cl;
    223 	int s, len;
    224 	u_char buf[OFBURSTLEN];
    225 
    226 	s = spltty();
    227 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    228 		splx(s);
    229 		return;
    230 	}
    231 	tp->t_state |= TS_BUSY;
    232 	splx(s);
    233 	cl = &tp->t_outq;
    234 	len = q_to_b(cl, buf, OFBURSTLEN);
    235 	prom_putstr(buf, len);
    236 	s = spltty();
    237 	tp->t_state &= ~TS_BUSY;
    238 	if (cl->c_cc) {
    239 		tp->t_state |= TS_TIMEOUT;
    240 		callout_reset(&tp->t_rstrt_ch, 1, ttrstrt, (void *)tp);
    241 	}
    242 	if (cl->c_cc <= tp->t_lowat) {
    243 		if (tp->t_state & TS_ASLEEP) {
    244 			tp->t_state &= ~TS_ASLEEP;
    245 			wakeup(cl);
    246 		}
    247 		selwakeup(&tp->t_wsel);
    248 	}
    249 	splx(s);
    250 }
    251 
    252 static int
    253 pconsparam(struct tty *tp, struct termios *t)
    254 {
    255 	tp->t_ispeed = t->c_ispeed;
    256 	tp->t_ospeed = t->c_ospeed;
    257 	tp->t_cflag = t->c_cflag;
    258 	return 0;
    259 }
    260 
    261 static void
    262 pcons_poll(void *aux)
    263 {
    264 	struct pconssoftc *sc = aux;
    265 	struct tty *tp = sc->of_tty;
    266 	int c;
    267 	char ch;
    268 
    269 	while ((c = prom_peekchar()) >= 0) {
    270 		ch = c;
    271 		cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
    272 		if (tp && (tp->t_state & TS_ISOPEN))
    273 			(*tp->t_linesw->l_rint)(ch, tp);
    274 	}
    275 	callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    276 }
    277 
    278 int
    279 pconsprobe(void)
    280 {
    281 	switch (prom_version()) {
    282 #ifdef	PROM_OLDMON
    283 	case PROM_OLDMON:
    284 	case PROM_OBP_V0:
    285 		return (1);
    286 #endif	/* PROM_OLDMON */
    287 #ifdef	PROM_OBP_V2
    288 	case PROM_OBP_V2:
    289 	case PROM_OBP_V3:
    290 	case PROM_OPENFIRM:
    291 		return (prom_stdin() && prom_stdout());
    292 #endif	/* PROM_OBP_V2 */
    293 	default: break;
    294 	}
    295 	return (0);
    296 }
    297 
    298 void
    299 pcons_cnpollc(dev_t dev, int on)
    300 {
    301 	struct pconssoftc *sc = NULL;
    302 
    303 	if (pcons_cd.cd_devs)
    304 		sc = pcons_cd.cd_devs[minor(dev)];
    305 
    306 	if (on) {
    307 		if (!sc) return;
    308 		if (sc->of_flags & OFPOLL)
    309 			callout_stop(&sc->sc_poll_ch);
    310 		sc->of_flags &= ~OFPOLL;
    311 	} else {
    312                 /* Resuming kernel. */
    313 		if (sc && !(sc->of_flags & OFPOLL)) {
    314 			sc->of_flags |= OFPOLL;
    315 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    316 		}
    317 	}
    318 }
    319 
    320 void pcons_dopoll(void);
    321 void
    322 pcons_dopoll(void)
    323 {
    324 	pcons_poll((void*)pcons_cd.cd_devs[0]);
    325 }
    326