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pcons.c revision 1.20 
      1 /*	$NetBSD: pcons.c,v 1.20 2011/04/24 16:26:58 rmind 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 2011/04/24 16:26:58 rmind 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/promlib.h>
     56 #include <machine/cpu.h>
     57 #include <machine/psl.h>
     58 
     59 #include <dev/cons.h>
     60 
     61 #include <sun2/dev/cons.h>
     62 
     63 #include "ioconf.h"
     64 
     65 static int pconsmatch(device_t, cfdata_t, void *);
     66 static void pconsattach(device_t, device_t, void *);
     67 
     68 CFATTACH_DECL_NEW(pcons, sizeof(struct pconssoftc),
     69     pconsmatch, pconsattach, NULL, NULL);
     70 
     71 static struct cnm_state pcons_cnm_state;
     72 
     73 static int pconsprobe(void);
     74 
     75 dev_type_open(pconsopen);
     76 dev_type_close(pconsclose);
     77 dev_type_read(pconsread);
     78 dev_type_write(pconswrite);
     79 dev_type_ioctl(pconsioctl);
     80 dev_type_tty(pconstty);
     81 dev_type_poll(pconspoll);
     82 
     83 const struct cdevsw pcons_cdevsw = {
     84 	pconsopen, pconsclose, pconsread, pconswrite, pconsioctl,
     85 	nostop, pconstty, pconspoll, nommap, ttykqfilter, D_TTY
     86 };
     87 
     88 static int
     89 pconsmatch(device_t parent, cfdata_t cf, void *aux)
     90 {
     91 	struct mainbus_attach_args *ma = aux;
     92 	extern int prom_cngetc(dev_t);
     93 
     94 	/* Only attach if no other console has attached. */
     95 	return (ma->ma_name != NULL) &&
     96 	    (strcmp("pcons", ma->ma_name) == 0) &&
     97 	    (cn_tab->cn_getc == prom_cngetc);
     98 
     99 }
    100 
    101 static void
    102 pconsattach(device_t parent, device_t self, void *aux)
    103 {
    104 	struct pconssoftc *sc = device_private(self);
    105 
    106 	aprint_normal("\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, 0);
    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 	struct tty *tp;
    124 
    125 	sc = device_lookup_private(&pcons_cd, minor(dev));
    126 	if (sc == NULL)
    127 		return ENXIO;
    128 	if ((tp = sc->of_tty) == NULL)
    129 		sc->of_tty = tp = tty_alloc();
    130 	tp->t_oproc = pconsstart;
    131 	tp->t_param = pconsparam;
    132 	tp->t_dev = dev;
    133 	cn_tab->cn_dev = dev;
    134 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
    135 		return (EBUSY);
    136 	if ((tp->t_state & TS_ISOPEN) == 0) {
    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 	}
    146 	tp->t_state |= TS_CARR_ON;
    147 
    148 	if ((sc->of_flags & OFPOLL) == 0) {
    149 		sc->of_flags |= OFPOLL;
    150 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    151 	}
    152 
    153 	return (*tp->t_linesw->l_open)(dev, tp);
    154 }
    155 
    156 int
    157 pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
    158 {
    159 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    160 	struct tty *tp = sc->of_tty;
    161 
    162 	callout_stop(&sc->sc_poll_ch);
    163 	sc->of_flags &= ~OFPOLL;
    164 	(*tp->t_linesw->l_close)(tp, flag);
    165 	ttyclose(tp);
    166 	return 0;
    167 }
    168 
    169 int
    170 pconsread(dev_t dev, struct uio *uio, int flag)
    171 {
    172 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    173 	struct tty *tp = sc->of_tty;
    174 
    175 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    176 }
    177 
    178 int
    179 pconswrite(dev_t dev, struct uio *uio, int flag)
    180 {
    181 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    182 	struct tty *tp = sc->of_tty;
    183 
    184 	return (*tp->t_linesw->l_write)(tp, uio, flag);
    185 }
    186 
    187 int
    188 pconspoll(dev_t dev, int events, struct lwp *l)
    189 {
    190 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    191 	struct tty *tp = sc->of_tty;
    192 
    193 	return (*tp->t_linesw->l_poll)(tp, events, l);
    194 }
    195 
    196 int
    197 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    198 {
    199 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    200 	struct tty *tp = sc->of_tty;
    201 	int error;
    202 
    203 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) >= 0)
    204 		return error;
    205 	if ((error = ttioctl(tp, cmd, data, flag, l)) >= 0)
    206 		return error;
    207 	return ENOTTY;
    208 }
    209 
    210 struct tty *
    211 pconstty(dev_t dev)
    212 {
    213 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    214 
    215 	return sc->of_tty;
    216 }
    217 
    218 static void
    219 pconsstart(struct tty *tp)
    220 {
    221 	struct clist *cl;
    222 	int s, len;
    223 	uint8_t buf[OFBURSTLEN];
    224 
    225 	s = spltty();
    226 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    227 		splx(s);
    228 		return;
    229 	}
    230 	tp->t_state |= TS_BUSY;
    231 	splx(s);
    232 	cl = &tp->t_outq;
    233 	len = q_to_b(cl, buf, OFBURSTLEN);
    234 	prom_putstr(buf, len);
    235 	s = spltty();
    236 	tp->t_state &= ~TS_BUSY;
    237 	if (ttypull(tp)) {
    238 		tp->t_state |= TS_TIMEOUT;
    239 		callout_schedule(&tp->t_rstrt_ch, 1);
    240 	}
    241 	splx(s);
    242 }
    243 
    244 static int
    245 pconsparam(struct tty *tp, struct termios *t)
    246 {
    247 
    248 	tp->t_ispeed = t->c_ispeed;
    249 	tp->t_ospeed = t->c_ospeed;
    250 	tp->t_cflag = t->c_cflag;
    251 	return 0;
    252 }
    253 
    254 static void
    255 pcons_poll(void *aux)
    256 {
    257 	struct pconssoftc *sc = aux;
    258 	struct tty *tp = sc->of_tty;
    259 	int c;
    260 	char ch;
    261 
    262 	while ((c = prom_peekchar()) >= 0) {
    263 		ch = c;
    264 		cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
    265 		if (tp && (tp->t_state & TS_ISOPEN))
    266 			(*tp->t_linesw->l_rint)(ch, tp);
    267 	}
    268 	callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    269 }
    270 
    271 int
    272 pconsprobe(void)
    273 {
    274 
    275 	switch (prom_version()) {
    276 #ifdef	PROM_OLDMON
    277 	case PROM_OLDMON:
    278 	case PROM_OBP_V0:
    279 		return 1;
    280 #endif	/* PROM_OLDMON */
    281 #ifdef	PROM_OBP_V2
    282 	case PROM_OBP_V2:
    283 	case PROM_OBP_V3:
    284 	case PROM_OPENFIRM:
    285 		return prom_stdin() && prom_stdout();
    286 #endif	/* PROM_OBP_V2 */
    287 	default:
    288 		break;
    289 	}
    290 	return 0;
    291 }
    292 
    293 void
    294 pcons_cnpollc(dev_t dev, int on)
    295 {
    296 	struct pconssoftc *sc;
    297 
    298 	sc = device_lookup_private(&pcons_cd, minor(dev));
    299 	if (sc == NULL)
    300 		return;
    301 
    302 	if (on) {
    303 		if (sc->of_flags & OFPOLL)
    304 			callout_stop(&sc->sc_poll_ch);
    305 		sc->of_flags &= ~OFPOLL;
    306 	} else {
    307                 /* Resuming kernel. */
    308 		if ((sc->of_flags & OFPOLL) == 0) {
    309 			sc->of_flags |= OFPOLL;
    310 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    311 		}
    312 	}
    313 }
    314 
    315 void pcons_dopoll(void);
    316 
    317 void
    318 pcons_dopoll(void)
    319 {
    320 
    321 	pcons_poll(device_lookup_private(&pcons_cd, 0));
    322 }
    323