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arcbios_tty.c revision 1.9.2.3
      1 /*	$NetBSD: arcbios_tty.c,v 1.9.2.3 2007/09/03 14:33:25 yamt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: arcbios_tty.c,v 1.9.2.3 2007/09/03 14:33:25 yamt Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/user.h>
     35 #include <sys/uio.h>
     36 #include <sys/systm.h>
     37 #include <sys/callout.h>
     38 #include <sys/kernel.h>
     39 #include <sys/conf.h>
     40 #include <sys/proc.h>
     41 #include <sys/tty.h>
     42 #include <sys/termios.h>
     43 #include <sys/kauth.h>
     44 
     45 #include <dev/cons.h>
     46 
     47 #include <dev/arcbios/arcbios.h>
     48 #include <dev/arcbios/arcbiosvar.h>
     49 
     50 callout_t  arcbios_tty_ch;
     51 bool arcbios_ch_init;
     52 static struct tty *arcbios_tty[1];
     53 
     54 void	arcbios_tty_start(struct tty *);
     55 void	arcbios_tty_poll(void *);
     56 int	arcbios_tty_param(struct tty *, struct termios *);
     57 
     58 dev_type_open(arcbios_ttyopen);
     59 dev_type_close(arcbios_ttyclose);
     60 dev_type_read(arcbios_ttyread);
     61 dev_type_write(arcbios_ttywrite);
     62 dev_type_ioctl(arcbios_ttyioctl);
     63 dev_type_stop(arcbios_ttystop);
     64 dev_type_tty(arcbios_ttytty);
     65 dev_type_poll(arcbios_ttypoll);
     66 
     67 const struct cdevsw arcbios_cdevsw = {
     68 	arcbios_ttyopen, arcbios_ttyclose, arcbios_ttyread, arcbios_ttywrite,
     69 	arcbios_ttyioctl, arcbios_ttystop, arcbios_ttytty, arcbios_ttypoll,
     70 	nommap, ttykqfilter, D_TTY,
     71 };
     72 
     73 int
     74 arcbios_ttyopen(dev_t dev, int flag, int mode, struct lwp *l)
     75 {
     76 	int unit = minor(dev);
     77 	struct tty *tp;
     78 	int s, error = 0, setuptimeout = 0;
     79 
     80 	if (!arcbios_ch_init) {
     81 		arcbios_ch_init = true;
     82 		callout_init(&arcbios_tty_ch, 0);
     83 	}
     84 
     85 	if (unit != 0)
     86 		return (ENODEV);
     87 
     88 	s = spltty();
     89 
     90 	if (arcbios_tty[unit] == NULL) {
     91 		tp = arcbios_tty[unit] = ttymalloc();
     92 		tty_attach(tp);
     93 	} else
     94 		tp = arcbios_tty[unit];
     95 
     96 	tp->t_oproc = arcbios_tty_start;
     97 	tp->t_param = arcbios_tty_param;
     98 	tp->t_dev = dev;
     99 
    100 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) {
    101 		splx(s);
    102 		return (EBUSY);
    103 	}
    104 
    105 	if ((tp->t_state & TS_ISOPEN) == 0) {
    106 		tp->t_state |= TS_CARR_ON;
    107 		ttychars(tp);
    108 		tp->t_iflag = TTYDEF_IFLAG;
    109 		tp->t_oflag = TTYDEF_OFLAG;
    110 		tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
    111 		tp->t_lflag = TTYDEF_LFLAG;
    112 		tp->t_ispeed = tp->t_ospeed = 9600;
    113 		ttsetwater(tp);
    114 
    115 		setuptimeout = 1;
    116 	}
    117 
    118 	splx(s);
    119 
    120 	error = (*tp->t_linesw->l_open)(dev, tp);
    121 	if (error == 0 && setuptimeout)
    122 		callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    123 
    124 	return (error);
    125 }
    126 
    127 int
    128 arcbios_ttyclose(dev_t dev, int flag, int mode, struct lwp *l)
    129 {
    130 	int unit = minor(dev);
    131 	struct tty *tp = arcbios_tty[unit];
    132 
    133 	callout_stop(&arcbios_tty_ch);
    134 	(*tp->t_linesw->l_close)(tp, flag);
    135 	ttyclose(tp);
    136 	return (0);
    137 }
    138 
    139 int
    140 arcbios_ttyread(dev_t dev, struct uio *uio, int flag)
    141 {
    142 	struct tty *tp = arcbios_tty[minor(dev)];
    143 
    144 	return ((*tp->t_linesw->l_read)(tp, uio, flag));
    145 }
    146 
    147 int
    148 arcbios_ttywrite(dev_t dev, struct uio *uio, int flag)
    149 {
    150 	struct tty *tp = arcbios_tty[minor(dev)];
    151 
    152 	return ((*tp->t_linesw->l_write)(tp, uio, flag));
    153 }
    154 
    155 int
    156 arcbios_ttypoll(dev_t dev, int events, struct lwp *l)
    157 {
    158 	struct tty *tp = arcbios_tty[minor(dev)];
    159 
    160 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    161 }
    162 
    163 int
    164 arcbios_ttyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    165 {
    166 	int unit = minor(dev);
    167 	struct tty *tp = arcbios_tty[unit];
    168 	int error;
    169 
    170 	error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
    171 	if (error != EPASSTHROUGH)
    172 		return (error);
    173 	return (ttioctl(tp, cmd, data, flag, l));
    174 }
    175 
    176 int
    177 arcbios_tty_param(struct tty *tp, struct termios *t)
    178 {
    179 
    180 	return (0);
    181 }
    182 
    183 void
    184 arcbios_tty_start(struct tty *tp)
    185 {
    186 	u_long count;
    187 	int s;
    188 
    189 	s = spltty();
    190 	if (tp->t_state & (TS_TTSTOP | TS_BUSY))
    191 		goto out;
    192 	if (tp->t_outq.c_cc <= tp->t_lowat) {
    193 		if (tp->t_state & TS_ASLEEP) {
    194 			tp->t_state &= ~TS_ASLEEP;
    195 			wakeup((void *)&tp->t_outq);
    196 		}
    197 		selwakeup(&tp->t_wsel);
    198 	}
    199 	tp->t_state |= TS_BUSY;
    200 	while (tp->t_outq.c_cc != 0) {
    201 		(*ARCBIOS->Write)(ARCBIOS_STDOUT, tp->t_outq.c_cf,
    202 		    ndqb(&tp->t_outq, 0), &count);
    203 		ndflush(&tp->t_outq, count);
    204 	}
    205 	tp->t_state &= ~TS_BUSY;
    206  out:
    207 	splx(s);
    208 }
    209 
    210 void
    211 arcbios_ttystop(struct tty *tp, int flag)
    212 {
    213 	int s;
    214 
    215 	s = spltty();
    216 	if (tp->t_state & TS_BUSY)
    217 		if ((tp->t_state & TS_TTSTOP) == 0)
    218 			tp->t_state |= TS_FLUSH;
    219 	splx(s);
    220 }
    221 
    222 static int
    223 arcbios_tty_getchar(int *cp)
    224 {
    225 	char c;
    226 	int32_t q;
    227 	u_long count;
    228 
    229 	q = ARCBIOS->GetReadStatus(ARCBIOS_STDIN);
    230 
    231 	if (q == 0) {
    232 		ARCBIOS->Read(ARCBIOS_STDIN, &c, 1, &count);
    233 		*cp = c;
    234 
    235 		return 1;
    236 	}
    237 
    238 	return 0;
    239 }
    240 
    241 void
    242 arcbios_tty_poll(void *v)
    243 {
    244 	struct tty *tp = v;
    245 	int c, l_r;
    246 
    247 	while (arcbios_tty_getchar(&c)) {
    248 		if (tp->t_state & TS_ISOPEN)
    249 			l_r = (*tp->t_linesw->l_rint)(c, tp);
    250 	}
    251 	callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    252 }
    253 
    254 struct tty *
    255 arcbios_ttytty(dev_t dev)
    256 {
    257 
    258 	if (minor(dev) != 0)
    259 		panic("arcbios_ttytty: bogus");
    260 
    261 	return (arcbios_tty[0]);
    262 }
    263