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pcons.c revision 1.33 
      1 /*	$NetBSD: pcons.c,v 1.33 2014/03/16 05:20:26 dholland 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 1.33 2014/03/16 05:20:26 dholland 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(device_t, cfdata_t, void *);
     65 static void pconsattach(device_t, device_t, void *);
     66 
     67 CFATTACH_DECL_NEW(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 	.d_open = pconsopen,
     82 	.d_close = pconsclose,
     83 	.d_read = pconsread,
     84 	.d_write = pconswrite,
     85 	.d_ioctl = pconsioctl,
     86 	.d_stop = nostop,
     87 	.d_tty = pconstty,
     88 	.d_poll = pconspoll,
     89 	.d_mmap = nommap,
     90 	.d_kqfilter = ttykqfilter,
     91 	.d_flag = D_TTY
     92 };
     93 
     94 static struct cnm_state pcons_cnm_state;
     95 
     96 static int pconsprobe(void);
     97 extern struct consdev *cn_tab;
     98 
     99 static int
    100 pconsmatch(device_t parent, cfdata_t match, void *aux)
    101 {
    102 	struct mainbus_attach_args *ma = aux;
    103 	extern int  prom_cngetc(dev_t);
    104 
    105 	/* Only attach if no other console has attached. */
    106 	return ((strcmp("pcons", ma->ma_name) == 0) &&
    107 		(cn_tab->cn_getc == prom_cngetc));
    108 
    109 }
    110 
    111 static void
    112 pconsattach(device_t parent, device_t self, void *aux)
    113 {
    114 	struct pconssoftc *sc = device_private(self);
    115 	sc->of_dev = self;
    116 
    117 	printf("\n");
    118 	if (!pconsprobe())
    119 		return;
    120 
    121 	cn_init_magic(&pcons_cnm_state);
    122 	cn_set_magic("+++++");
    123 	callout_init(&sc->sc_poll_ch, 0);
    124 }
    125 
    126 static void pconsstart(struct tty *);
    127 static int pconsparam(struct tty *, struct termios *);
    128 static void pcons_poll(void *);
    129 
    130 int
    131 pconsopen(dev_t dev, int flag, int mode, struct lwp *l)
    132 {
    133 	struct pconssoftc *sc;
    134 	struct tty *tp;
    135 
    136 	sc = device_lookup_private(&pcons_cd, minor(dev));
    137 	if (!sc)
    138 		return ENXIO;
    139 	if (!(tp = sc->of_tty))
    140 		sc->of_tty = tp = tty_alloc();
    141 	tp->t_oproc = pconsstart;
    142 	tp->t_param = pconsparam;
    143 	tp->t_dev = dev;
    144 	cn_tab->cn_dev = dev;
    145 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
    146 		return (EBUSY);
    147 	if (!(tp->t_state & TS_ISOPEN)) {
    148 		ttychars(tp);
    149 		tp->t_iflag = TTYDEF_IFLAG;
    150 		tp->t_oflag = TTYDEF_OFLAG;
    151 		tp->t_cflag = TTYDEF_CFLAG;
    152 		tp->t_lflag = TTYDEF_LFLAG;
    153 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    154 		pconsparam(tp, &tp->t_termios);
    155 		ttsetwater(tp);
    156 	}
    157 	tp->t_state |= TS_CARR_ON;
    158 
    159 	if (!(sc->of_flags & OFPOLL)) {
    160 		sc->of_flags |= OFPOLL;
    161 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    162 	}
    163 
    164 	return (*tp->t_linesw->l_open)(dev, tp);
    165 }
    166 
    167 int
    168 pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
    169 {
    170 	struct pconssoftc *sc = device_lookup_private(&pcons_cd,minor(dev));
    171 	struct tty *tp = sc->of_tty;
    172 
    173 	callout_stop(&sc->sc_poll_ch);
    174 	sc->of_flags &= ~OFPOLL;
    175 	(*tp->t_linesw->l_close)(tp, flag);
    176 	ttyclose(tp);
    177 	return 0;
    178 }
    179 
    180 int
    181 pconsread(dev_t dev, struct uio *uio, int flag)
    182 {
    183 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    184 	struct tty *tp = sc->of_tty;
    185 
    186 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    187 }
    188 
    189 int
    190 pconswrite(dev_t dev, struct uio *uio, int flag)
    191 {
    192 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    193 	struct tty *tp = sc->of_tty;
    194 
    195 	return (*tp->t_linesw->l_write)(tp, uio, flag);
    196 }
    197 
    198 int
    199 pconspoll(dev_t dev, int events, struct lwp *l)
    200 {
    201 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    202 	struct tty *tp = sc->of_tty;
    203 
    204 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    205 }
    206 
    207 int
    208 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    209 {
    210 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    211 	struct tty *tp = sc->of_tty;
    212 	int error;
    213 
    214 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH)
    215 		return error;
    216 	return ttioctl(tp, cmd, data, flag, l);
    217 }
    218 
    219 struct tty *
    220 pconstty(dev_t dev)
    221 {
    222 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    223 
    224 	return sc->of_tty;
    225 }
    226 
    227 static void
    228 pconsstart(struct tty *tp)
    229 {
    230 	struct clist *cl;
    231 	int s, len;
    232 	u_char buf[OFBURSTLEN];
    233 
    234 	s = spltty();
    235 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    236 		splx(s);
    237 		return;
    238 	}
    239 	tp->t_state |= TS_BUSY;
    240 	splx(s);
    241 	cl = &tp->t_outq;
    242 	len = q_to_b(cl, buf, OFBURSTLEN);
    243 	prom_write(prom_stdout(), buf, len);
    244 	s = spltty();
    245 	tp->t_state &= ~TS_BUSY;
    246 	if (ttypull(tp)) {
    247 		tp->t_state |= TS_TIMEOUT;
    248 		callout_schedule(&tp->t_rstrt_ch, 1);
    249 	}
    250 	splx(s);
    251 }
    252 
    253 static int
    254 pconsparam(struct tty *tp, struct termios *t)
    255 {
    256 	tp->t_ispeed = t->c_ispeed;
    257 	tp->t_ospeed = t->c_ospeed;
    258 	tp->t_cflag = t->c_cflag;
    259 	return 0;
    260 }
    261 
    262 static void
    263 pcons_poll(void *aux)
    264 {
    265 	struct pconssoftc *sc = aux;
    266 	struct tty *tp = sc->of_tty;
    267 	char ch;
    268 
    269 	while (prom_read(prom_stdin(), &ch, 1) > 0) {
    270 		cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
    271 		if (tp && (tp->t_state & TS_ISOPEN))
    272 			(*tp->t_linesw->l_rint)(ch, tp);
    273 	}
    274 	callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    275 }
    276 
    277 int
    278 pconsprobe(void)
    279 {
    280 
    281 	return (prom_stdin() && prom_stdout());
    282 }
    283 
    284 void
    285 pcons_cnpollc(dev_t dev, int on)
    286 {
    287 	struct pconssoftc *sc;
    288 
    289 	sc = device_lookup_private(&pcons_cd, minor(dev));
    290 	if (sc == NULL)
    291 		return;
    292 
    293 	if (on) {
    294 		if (sc->of_flags & OFPOLL)
    295 			callout_stop(&sc->sc_poll_ch);
    296 		sc->of_flags &= ~OFPOLL;
    297 	} else {
    298                 /* Resuming kernel. */
    299 		if (!(sc->of_flags & OFPOLL)) {
    300 			sc->of_flags |= OFPOLL;
    301 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    302 		}
    303 	}
    304 }
    305 
    306 void pcons_dopoll(void);
    307 void
    308 pcons_dopoll(void)
    309 {
    310 		pcons_poll(device_lookup_private(&pcons_cd, 0));
    311 }
    312