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pcons.c revision 1.20 
      1 /*	$NetBSD: pcons.c,v 1.20 2006/02/13 21:47:12 cdi 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 1.20 2006/02/13 21:47:12 cdi 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/openfirm.h>
     55 #include <machine/cpu.h>
     56 #include <machine/eeprom.h>
     57 #include <machine/psl.h>
     58 
     59 #include <dev/cons.h>
     60 
     61 #include <sparc64/dev/cons.h>
     62 
     63 static int pconsmatch(struct device *, struct cfdata *, void *);
     64 static void pconsattach(struct device *, struct device *, void *);
     65 
     66 CFATTACH_DECL(pcons, sizeof(struct pconssoftc),
     67     pconsmatch, pconsattach, NULL, NULL);
     68 
     69 extern struct cfdriver pcons_cd;
     70 
     71 dev_type_open(pconsopen);
     72 dev_type_close(pconsclose);
     73 dev_type_read(pconsread);
     74 dev_type_write(pconswrite);
     75 dev_type_ioctl(pconsioctl);
     76 dev_type_tty(pconstty);
     77 dev_type_poll(pconspoll);
     78 
     79 const struct cdevsw pcons_cdevsw = {
     80 	pconsopen, pconsclose, pconsread, pconswrite, pconsioctl,
     81 	nostop, pconstty, pconspoll, nommap, ttykqfilter, D_TTY
     82 };
     83 
     84 static struct cnm_state pcons_cnm_state;
     85 
     86 static int pconsprobe(void);
     87 extern struct consdev *cn_tab;
     88 
     89 static int
     90 pconsmatch(struct device *parent, struct cfdata *match, void *aux)
     91 {
     92 	struct mainbus_attach_args *ma = aux;
     93 	extern int  prom_cngetc(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(struct device *parent, struct device *self, void *aux)
    103 {
    104 	struct pconssoftc *sc = (struct pconssoftc *) self;
    105 
    106 	printf("\n");
    107 	if (!pconsprobe())
    108 		return;
    109 
    110 	cn_init_magic(&pcons_cnm_state);
    111 	cn_set_magic("+++++");
    112 	callout_init(&sc->sc_poll_ch);
    113 }
    114 
    115 static void pconsstart(struct tty *);
    116 static int pconsparam(struct tty *, struct termios *);
    117 static void pcons_poll(void *);
    118 
    119 int
    120 pconsopen(dev_t dev, int flag, int mode, struct lwp *l)
    121 {
    122 	struct pconssoftc *sc;
    123 	int unit = minor(dev);
    124 	struct tty *tp;
    125 	struct proc *p;
    126 
    127 	p = l->l_proc;
    128 
    129 	if (unit >= pcons_cd.cd_ndevs)
    130 		return ENXIO;
    131 	sc = pcons_cd.cd_devs[unit];
    132 	if (!sc)
    133 		return ENXIO;
    134 	if (!(tp = sc->of_tty))
    135 		sc->of_tty = tp = ttymalloc();
    136 	tp->t_oproc = pconsstart;
    137 	tp->t_param = pconsparam;
    138 	tp->t_dev = dev;
    139 	cn_tab->cn_dev = dev;
    140 	if (!(tp->t_state & TS_ISOPEN)) {
    141 		ttychars(tp);
    142 		tp->t_iflag = TTYDEF_IFLAG;
    143 		tp->t_oflag = TTYDEF_OFLAG;
    144 		tp->t_cflag = TTYDEF_CFLAG;
    145 		tp->t_lflag = TTYDEF_LFLAG;
    146 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    147 		pconsparam(tp, &tp->t_termios);
    148 		ttsetwater(tp);
    149 	} else if ((tp->t_state&TS_XCLUDE) && suser(p->p_ucred, &p->p_acflag))
    150 		return EBUSY;
    151 	tp->t_state |= TS_CARR_ON;
    152 
    153 	if (!(sc->of_flags & OFPOLL)) {
    154 		sc->of_flags |= OFPOLL;
    155 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    156 	}
    157 
    158 	return (*tp->t_linesw->l_open)(dev, tp);
    159 }
    160 
    161 int
    162 pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
    163 {
    164 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    165 	struct tty *tp = sc->of_tty;
    166 
    167 	callout_stop(&sc->sc_poll_ch);
    168 	sc->of_flags &= ~OFPOLL;
    169 	(*tp->t_linesw->l_close)(tp, flag);
    170 	ttyclose(tp);
    171 	return 0;
    172 }
    173 
    174 int
    175 pconsread(dev_t dev, struct uio *uio, int flag)
    176 {
    177 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    178 	struct tty *tp = sc->of_tty;
    179 
    180 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    181 }
    182 
    183 int
    184 pconswrite(dev_t dev, struct uio *uio, 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_t dev, int events, struct lwp *l)
    194 {
    195 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    196 	struct tty *tp = sc->of_tty;
    197 
    198 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    199 }
    200 
    201 int
    202 pconsioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
    203 {
    204 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    205 	struct tty *tp = sc->of_tty;
    206 	int error;
    207 
    208 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH)
    209 		return error;
    210 	return ttioctl(tp, cmd, data, flag, l);
    211 }
    212 
    213 struct tty *
    214 pconstty(dev_t dev)
    215 {
    216 	struct pconssoftc *sc = pcons_cd.cd_devs[minor(dev)];
    217 
    218 	return sc->of_tty;
    219 }
    220 
    221 static void
    222 pconsstart(struct tty *tp)
    223 {
    224 	struct clist *cl;
    225 	int s, len;
    226 	u_char buf[OFBURSTLEN];
    227 
    228 	s = spltty();
    229 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    230 		splx(s);
    231 		return;
    232 	}
    233 	tp->t_state |= TS_BUSY;
    234 	splx(s);
    235 	cl = &tp->t_outq;
    236 	len = q_to_b(cl, buf, OFBURSTLEN);
    237 	prom_write(prom_stdout(), buf, len);
    238 	s = spltty();
    239 	tp->t_state &= ~TS_BUSY;
    240 	if (cl->c_cc) {
    241 		tp->t_state |= TS_TIMEOUT;
    242 		callout_reset(&tp->t_rstrt_ch, 1, ttrstrt, (void *)tp);
    243 	}
    244 	if (cl->c_cc <= tp->t_lowat) {
    245 		if (tp->t_state & TS_ASLEEP) {
    246 			tp->t_state &= ~TS_ASLEEP;
    247 			wakeup(cl);
    248 		}
    249 		selwakeup(&tp->t_wsel);
    250 	}
    251 	splx(s);
    252 }
    253 
    254 static int
    255 pconsparam(struct tty *tp, struct termios *t)
    256 {
    257 	tp->t_ispeed = t->c_ispeed;
    258 	tp->t_ospeed = t->c_ospeed;
    259 	tp->t_cflag = t->c_cflag;
    260 	return 0;
    261 }
    262 
    263 static void
    264 pcons_poll(void *aux)
    265 {
    266 	struct pconssoftc *sc = aux;
    267 	struct tty *tp = sc->of_tty;
    268 	char ch;
    269 
    270 	while (prom_read(prom_stdin(), &ch, 1) > 0) {
    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()
    280 {
    281 
    282 	return (prom_stdin() && prom_stdout());
    283 }
    284 
    285 void
    286 pcons_cnpollc(dev_t dev, int on)
    287 {
    288 	struct pconssoftc *sc = NULL;
    289 
    290 	if (pcons_cd.cd_devs)
    291 		sc = pcons_cd.cd_devs[minor(dev)];
    292 
    293 	if (on) {
    294 		if (!sc) return;
    295 		if (sc->of_flags & OFPOLL)
    296 			callout_stop(&sc->sc_poll_ch);
    297 		sc->of_flags &= ~OFPOLL;
    298 	} else {
    299                 /* Resuming kernel. */
    300 		if (sc && !(sc->of_flags & OFPOLL)) {
    301 			sc->of_flags |= OFPOLL;
    302 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    303 		}
    304 	}
    305 }
    306 
    307 void pcons_dopoll(void);
    308 void
    309 pcons_dopoll() {
    310 		pcons_poll((void*)pcons_cd.cd_devs[0]);
    311 }
    312