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      1 /*	$NetBSD: pcons.c,v 1.22 2014/07/25 08:10:35 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 1.22 2014/07/25 08:10:35 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/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 	.d_open = pconsopen,
     85 	.d_close = pconsclose,
     86 	.d_read = pconsread,
     87 	.d_write = pconswrite,
     88 	.d_ioctl = pconsioctl,
     89 	.d_stop = nostop,
     90 	.d_tty = pconstty,
     91 	.d_poll = pconspoll,
     92 	.d_mmap = nommap,
     93 	.d_kqfilter = ttykqfilter,
     94 	.d_discard = nodiscard,
     95 	.d_flag = D_TTY
     96 };
     97 
     98 static int
     99 pconsmatch(device_t parent, cfdata_t cf, void *aux)
    100 {
    101 	struct mainbus_attach_args *ma = aux;
    102 	extern int prom_cngetc(dev_t);
    103 
    104 	/* Only attach if no other console has attached. */
    105 	return (ma->ma_name != NULL) &&
    106 	    (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 
    116 	aprint_normal("\n");
    117 	if (!pconsprobe())
    118 		return;
    119 
    120 	cn_init_magic(&pcons_cnm_state);
    121 	cn_set_magic("+++++");
    122 	callout_init(&sc->sc_poll_ch, 0);
    123 }
    124 
    125 static void pconsstart(struct tty *);
    126 static int pconsparam(struct tty *, struct termios *);
    127 static void pcons_poll(void *);
    128 
    129 int
    130 pconsopen(dev_t dev, int flag, int mode, struct lwp *l)
    131 {
    132 	struct pconssoftc *sc;
    133 	struct tty *tp;
    134 
    135 	sc = device_lookup_private(&pcons_cd, minor(dev));
    136 	if (sc == NULL)
    137 		return ENXIO;
    138 	if ((tp = sc->of_tty) == NULL)
    139 		sc->of_tty = tp = tty_alloc();
    140 	tp->t_oproc = pconsstart;
    141 	tp->t_param = pconsparam;
    142 	tp->t_dev = dev;
    143 	cn_tab->cn_dev = dev;
    144 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
    145 		return (EBUSY);
    146 	if ((tp->t_state & TS_ISOPEN) == 0) {
    147 		ttychars(tp);
    148 		tp->t_iflag = TTYDEF_IFLAG;
    149 		tp->t_oflag = TTYDEF_OFLAG;
    150 		tp->t_cflag = TTYDEF_CFLAG;
    151 		tp->t_lflag = TTYDEF_LFLAG;
    152 		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
    153 		pconsparam(tp, &tp->t_termios);
    154 		ttsetwater(tp);
    155 	}
    156 	tp->t_state |= TS_CARR_ON;
    157 
    158 	if ((sc->of_flags & OFPOLL) == 0) {
    159 		sc->of_flags |= OFPOLL;
    160 		callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    161 	}
    162 
    163 	return (*tp->t_linesw->l_open)(dev, tp);
    164 }
    165 
    166 int
    167 pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
    168 {
    169 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    170 	struct tty *tp = sc->of_tty;
    171 
    172 	callout_stop(&sc->sc_poll_ch);
    173 	sc->of_flags &= ~OFPOLL;
    174 	(*tp->t_linesw->l_close)(tp, flag);
    175 	ttyclose(tp);
    176 	return 0;
    177 }
    178 
    179 int
    180 pconsread(dev_t dev, struct uio *uio, int flag)
    181 {
    182 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    183 	struct tty *tp = sc->of_tty;
    184 
    185 	return (*tp->t_linesw->l_read)(tp, uio, flag);
    186 }
    187 
    188 int
    189 pconswrite(dev_t dev, struct uio *uio, int flag)
    190 {
    191 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    192 	struct tty *tp = sc->of_tty;
    193 
    194 	return (*tp->t_linesw->l_write)(tp, uio, flag);
    195 }
    196 
    197 int
    198 pconspoll(dev_t dev, int events, struct lwp *l)
    199 {
    200 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    201 	struct tty *tp = sc->of_tty;
    202 
    203 	return (*tp->t_linesw->l_poll)(tp, events, l);
    204 }
    205 
    206 int
    207 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    208 {
    209 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    210 	struct tty *tp = sc->of_tty;
    211 	int error;
    212 
    213 	if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) >= 0)
    214 		return error;
    215 	if ((error = ttioctl(tp, cmd, data, flag, l)) >= 0)
    216 		return error;
    217 	return ENOTTY;
    218 }
    219 
    220 struct tty *
    221 pconstty(dev_t dev)
    222 {
    223 	struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
    224 
    225 	return sc->of_tty;
    226 }
    227 
    228 static void
    229 pconsstart(struct tty *tp)
    230 {
    231 	struct clist *cl;
    232 	int s, len;
    233 	uint8_t buf[OFBURSTLEN];
    234 
    235 	s = spltty();
    236 	if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
    237 		splx(s);
    238 		return;
    239 	}
    240 	tp->t_state |= TS_BUSY;
    241 	splx(s);
    242 	cl = &tp->t_outq;
    243 	len = q_to_b(cl, buf, OFBURSTLEN);
    244 	prom_putstr(buf, len);
    245 	s = spltty();
    246 	tp->t_state &= ~TS_BUSY;
    247 	if (ttypull(tp)) {
    248 		tp->t_state |= TS_TIMEOUT;
    249 		callout_schedule(&tp->t_rstrt_ch, 1);
    250 	}
    251 	splx(s);
    252 }
    253 
    254 static int
    255 pconsparam(struct tty *tp, struct termios *t)
    256 {
    257 
    258 	tp->t_ispeed = t->c_ispeed;
    259 	tp->t_ospeed = t->c_ospeed;
    260 	tp->t_cflag = t->c_cflag;
    261 	return 0;
    262 }
    263 
    264 static void
    265 pcons_poll(void *aux)
    266 {
    267 	struct pconssoftc *sc = aux;
    268 	struct tty *tp = sc->of_tty;
    269 	int c;
    270 	char ch;
    271 
    272 	while ((c = prom_peekchar()) >= 0) {
    273 		ch = c;
    274 		cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
    275 		if (tp && (tp->t_state & TS_ISOPEN))
    276 			(*tp->t_linesw->l_rint)(ch, tp);
    277 	}
    278 	callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    279 }
    280 
    281 int
    282 pconsprobe(void)
    283 {
    284 
    285 	switch (prom_version()) {
    286 #ifdef	PROM_OLDMON
    287 	case PROM_OLDMON:
    288 	case PROM_OBP_V0:
    289 		return 1;
    290 #endif	/* PROM_OLDMON */
    291 #ifdef	PROM_OBP_V2
    292 	case PROM_OBP_V2:
    293 	case PROM_OBP_V3:
    294 	case PROM_OPENFIRM:
    295 		return prom_stdin() && prom_stdout();
    296 #endif	/* PROM_OBP_V2 */
    297 	default:
    298 		break;
    299 	}
    300 	return 0;
    301 }
    302 
    303 void
    304 pcons_cnpollc(dev_t dev, int on)
    305 {
    306 	struct pconssoftc *sc;
    307 
    308 	sc = device_lookup_private(&pcons_cd, minor(dev));
    309 	if (sc == NULL)
    310 		return;
    311 
    312 	if (on) {
    313 		if (sc->of_flags & OFPOLL)
    314 			callout_stop(&sc->sc_poll_ch);
    315 		sc->of_flags &= ~OFPOLL;
    316 	} else {
    317                 /* Resuming kernel. */
    318 		if ((sc->of_flags & OFPOLL) == 0) {
    319 			sc->of_flags |= OFPOLL;
    320 			callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
    321 		}
    322 	}
    323 }
    324 
    325 void pcons_dopoll(void);
    326 
    327 void
    328 pcons_dopoll(void)
    329 {
    330 
    331 	pcons_poll(device_lookup_private(&pcons_cd, 0));
    332 }
    333