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pcons.c revision 1.29 
      1 /*	$NetBSD: pcons.c,v 1.29 2008/06/13 13:10:49 cegger 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 1.29 2008/06/13 13:10:49 cegger 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 #include <sys/kauth.h>
     53 
     54 #include <machine/autoconf.h>
     55 #include <machine/openfirm.h>
     56 #include <machine/cpu.h>
     57 #include <machine/eeprom.h>
     58 #include <machine/psl.h>
     59 
     60 #include <dev/cons.h>
     61 
     62 #include <sparc64/dev/cons.h>
     63 
     64 static int pconsmatch(struct device *, struct cfdata *, void *);
     65 static void pconsattach(struct device *, struct device *, void *);
     66 
     67 CFATTACH_DECL(pcons, sizeof(struct pconssoftc),
     68     pconsmatch, pconsattach, NULL, NULL);
     69 
     70 extern struct cfdriver pcons_cd;
     71 
     72 dev_type_open(pconsopen);
     73 dev_type_close(pconsclose);
     74 dev_type_read(pconsread);
     75 dev_type_write(pconswrite);
     76 dev_type_ioctl(pconsioctl);
     77 dev_type_tty(pconstty);
     78 dev_type_poll(pconspoll);
     79 
     80 const struct cdevsw pcons_cdevsw = {
     81 	pconsopen, pconsclose, pconsread, pconswrite, pconsioctl,
     82 	nostop, pconstty, pconspoll, nommap, ttykqfilter, D_TTY
     83 };
     84 
     85 static struct cnm_state pcons_cnm_state;
     86 
     87 static int pconsprobe(void);
     88 extern struct consdev *cn_tab;
     89 
     90 static int
     91 pconsmatch(struct device *parent, struct cfdata *match, void *aux)
     92 {
     93 	struct mainbus_attach_args *ma = aux;
     94 	extern int  prom_cngetc(dev_t);
     95 
     96 	/* Only attach if no other console has attached. */
     97 	return ((strcmp("pcons", ma->ma_name) == 0) &&
     98 		(cn_tab->cn_getc == prom_cngetc));
     99 
    100 }
    101 
    102 static void
    103 pconsattach(struct device *parent, struct device *self, void *aux)
    104 {
    105 	struct pconssoftc *sc = (struct pconssoftc *) self;
    106 
    107 	printf("\n");
    108 	if (!pconsprobe())
    109 		return;
    110 
    111 	cn_init_magic(&pcons_cnm_state);
    112 	cn_set_magic("+++++");
    113 	callout_init(&sc->sc_poll_ch, 0);
    114 }
    115 
    116 static void pconsstart(struct tty *);
    117 static int pconsparam(struct tty *, struct termios *);
    118 static void pcons_poll(void *);
    119 
    120 int
    121 pconsopen(dev_t dev, int flag, int mode, struct lwp *l)
    122 {
    123 	struct pconssoftc *sc;
    124 	struct tty *tp;
    125 	struct proc *p;
    126 
    127 	p = l->l_proc;
    128 
    129 	sc = device_lookup_private(&pcons_cd, minor(dev));
    130 	if (!sc)
    131 		return ENXIO;
    132 	if (!(tp = sc->of_tty))
    133 		sc->of_tty = tp = ttymalloc();
    134 	tp->t_oproc = pconsstart;
    135 	tp->t_param = pconsparam;
    136 	tp->t_dev = dev;
    137 	cn_tab->cn_dev = dev;
    138 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
    139 		return (EBUSY);
    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 	}
    150 	tp->t_state |= TS_CARR_ON;
    151 
    152 	if (!(sc->of_flags & OFPOLL)) {
    153 		sc->of_flags |= OFPOLL;
    154 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    155 	}
    156 
    157 	return (*tp->t_linesw->l_open)(dev, tp);
    158 }
    159 
    160 int
    161 pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
    162 {
    163 	struct pconssoftc *sc = device_lookup_private(&pcons_cd,minor(dev));
    164 	struct tty *tp = sc->of_tty;
    165 
    166 	callout_stop(&sc->sc_poll_ch);
    167 	sc->of_flags &= ~OFPOLL;
    168 	(*tp->t_linesw->l_close)(tp, flag);
    169 	ttyclose(tp);
    170 	return 0;
    171 }
    172 
    173 int
    174 pconsread(dev_t dev, struct uio *uio, int flag)
    175 {
    176 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    177 	struct tty *tp = sc->of_tty;
    178 
    179 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    180 }
    181 
    182 int
    183 pconswrite(dev_t dev, struct uio *uio, int flag)
    184 {
    185 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    186 	struct tty *tp = sc->of_tty;
    187 
    188 	return (*tp->t_linesw->l_write)(tp, uio, flag);
    189 }
    190 
    191 int
    192 pconspoll(dev_t dev, int events, struct lwp *l)
    193 {
    194 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    195 	struct tty *tp = sc->of_tty;
    196 
    197 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    198 }
    199 
    200 int
    201 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    202 {
    203 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    204 	struct tty *tp = sc->of_tty;
    205 	int error;
    206 
    207 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH)
    208 		return error;
    209 	return ttioctl(tp, cmd, data, flag, l);
    210 }
    211 
    212 struct tty *
    213 pconstty(dev_t dev)
    214 {
    215 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    216 
    217 	return sc->of_tty;
    218 }
    219 
    220 static void
    221 pconsstart(struct tty *tp)
    222 {
    223 	struct clist *cl;
    224 	int s, len;
    225 	u_char buf[OFBURSTLEN];
    226 
    227 	s = spltty();
    228 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    229 		splx(s);
    230 		return;
    231 	}
    232 	tp->t_state |= TS_BUSY;
    233 	splx(s);
    234 	cl = &tp->t_outq;
    235 	len = q_to_b(cl, buf, OFBURSTLEN);
    236 	prom_write(prom_stdout(), buf, len);
    237 	s = spltty();
    238 	tp->t_state &= ~TS_BUSY;
    239 	if (ttypull(tp)) {
    240 		tp->t_state |= TS_TIMEOUT;
    241 		callout_schedule(&tp->t_rstrt_ch, 1);
    242 	}
    243 	splx(s);
    244 }
    245 
    246 static int
    247 pconsparam(struct tty *tp, struct termios *t)
    248 {
    249 	tp->t_ispeed = t->c_ispeed;
    250 	tp->t_ospeed = t->c_ospeed;
    251 	tp->t_cflag = t->c_cflag;
    252 	return 0;
    253 }
    254 
    255 static void
    256 pcons_poll(void *aux)
    257 {
    258 	struct pconssoftc *sc = aux;
    259 	struct tty *tp = sc->of_tty;
    260 	char ch;
    261 
    262 	while (prom_read(prom_stdin(), &ch, 1) > 0) {
    263 		cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
    264 		if (tp && (tp->t_state & TS_ISOPEN))
    265 			(*tp->t_linesw->l_rint)(ch, tp);
    266 	}
    267 	callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    268 }
    269 
    270 int
    271 pconsprobe(void)
    272 {
    273 
    274 	return (prom_stdin() && prom_stdout());
    275 }
    276 
    277 void
    278 pcons_cnpollc(dev_t dev, int on)
    279 {
    280 	struct pconssoftc *sc;
    281 
    282 	sc = device_lookup_private(&pcons_cd, minor(dev));
    283 	if (sc == NULL)
    284 		return;
    285 
    286 	if (on) {
    287 		if (sc->of_flags & OFPOLL)
    288 			callout_stop(&sc->sc_poll_ch);
    289 		sc->of_flags &= ~OFPOLL;
    290 	} else {
    291                 /* Resuming kernel. */
    292 		if (!(sc->of_flags & OFPOLL)) {
    293 			sc->of_flags |= OFPOLL;
    294 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    295 		}
    296 	}
    297 }
    298 
    299 void pcons_dopoll(void);
    300 void
    301 pcons_dopoll(void)
    302 {
    303 		pcons_poll(device_lookup_private(&pcons_cd, 0));
    304 }
    305