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arcbios_tty.c revision 1.9.2.2 
      1 /*	$NetBSD: arcbios_tty.c,v 1.9.2.2 2006/12/30 20:47:54 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 1.9.2.2 2006/12/30 20:47:54 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 struct callout arcbios_tty_ch = CALLOUT_INITIALIZER;
     51 
     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 (unit != 0)
     81 		return (ENODEV);
     82 
     83 	s = spltty();
     84 
     85 	if (arcbios_tty[unit] == NULL) {
     86 		tp = arcbios_tty[unit] = ttymalloc();
     87 		tty_attach(tp);
     88 	} else
     89 		tp = arcbios_tty[unit];
     90 
     91 	tp->t_oproc = arcbios_tty_start;
     92 	tp->t_param = arcbios_tty_param;
     93 	tp->t_dev = dev;
     94 
     95 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) {
     96 		splx(s);
     97 		return (EBUSY);
     98 	}
     99 
    100 	if ((tp->t_state & TS_ISOPEN) == 0) {
    101 		tp->t_state |= TS_CARR_ON;
    102 		ttychars(tp);
    103 		tp->t_iflag = TTYDEF_IFLAG;
    104 		tp->t_oflag = TTYDEF_OFLAG;
    105 		tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
    106 		tp->t_lflag = TTYDEF_LFLAG;
    107 		tp->t_ispeed = tp->t_ospeed = 9600;
    108 		ttsetwater(tp);
    109 
    110 		setuptimeout = 1;
    111 	}
    112 
    113 	splx(s);
    114 
    115 	error = (*tp->t_linesw->l_open)(dev, tp);
    116 	if (error == 0 && setuptimeout)
    117 		callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    118 
    119 	return (error);
    120 }
    121 
    122 int
    123 arcbios_ttyclose(dev_t dev, int flag, int mode, struct lwp *l)
    124 {
    125 	int unit = minor(dev);
    126 	struct tty *tp = arcbios_tty[unit];
    127 
    128 	callout_stop(&arcbios_tty_ch);
    129 	(*tp->t_linesw->l_close)(tp, flag);
    130 	ttyclose(tp);
    131 	return (0);
    132 }
    133 
    134 int
    135 arcbios_ttyread(dev_t dev, struct uio *uio, int flag)
    136 {
    137 	struct tty *tp = arcbios_tty[minor(dev)];
    138 
    139 	return ((*tp->t_linesw->l_read)(tp, uio, flag));
    140 }
    141 
    142 int
    143 arcbios_ttywrite(dev_t dev, struct uio *uio, int flag)
    144 {
    145 	struct tty *tp = arcbios_tty[minor(dev)];
    146 
    147 	return ((*tp->t_linesw->l_write)(tp, uio, flag));
    148 }
    149 
    150 int
    151 arcbios_ttypoll(dev_t dev, int events, struct lwp *l)
    152 {
    153 	struct tty *tp = arcbios_tty[minor(dev)];
    154 
    155 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    156 }
    157 
    158 int
    159 arcbios_ttyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
    160 {
    161 	int unit = minor(dev);
    162 	struct tty *tp = arcbios_tty[unit];
    163 	int error;
    164 
    165 	error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
    166 	if (error != EPASSTHROUGH)
    167 		return (error);
    168 	return (ttioctl(tp, cmd, data, flag, l));
    169 }
    170 
    171 int
    172 arcbios_tty_param(struct tty *tp, struct termios *t)
    173 {
    174 
    175 	return (0);
    176 }
    177 
    178 void
    179 arcbios_tty_start(struct tty *tp)
    180 {
    181 	u_long count;
    182 	int s;
    183 
    184 	s = spltty();
    185 	if (tp->t_state & (TS_TTSTOP | TS_BUSY))
    186 		goto out;
    187 	if (tp->t_outq.c_cc <= tp->t_lowat) {
    188 		if (tp->t_state & TS_ASLEEP) {
    189 			tp->t_state &= ~TS_ASLEEP;
    190 			wakeup((caddr_t)&tp->t_outq);
    191 		}
    192 		selwakeup(&tp->t_wsel);
    193 	}
    194 	tp->t_state |= TS_BUSY;
    195 	while (tp->t_outq.c_cc != 0) {
    196 		(*ARCBIOS->Write)(ARCBIOS_STDOUT, tp->t_outq.c_cf,
    197 		    ndqb(&tp->t_outq, 0), &count);
    198 		ndflush(&tp->t_outq, count);
    199 	}
    200 	tp->t_state &= ~TS_BUSY;
    201  out:
    202 	splx(s);
    203 }
    204 
    205 void
    206 arcbios_ttystop(struct tty *tp, int flag)
    207 {
    208 	int s;
    209 
    210 	s = spltty();
    211 	if (tp->t_state & TS_BUSY)
    212 		if ((tp->t_state & TS_TTSTOP) == 0)
    213 			tp->t_state |= TS_FLUSH;
    214 	splx(s);
    215 }
    216 
    217 static int
    218 arcbios_tty_getchar(int *cp)
    219 {
    220 	char c;
    221 	int32_t q;
    222 	u_long count;
    223 
    224 	q = ARCBIOS->GetReadStatus(ARCBIOS_STDIN);
    225 
    226 	if (q == 0) {
    227 		ARCBIOS->Read(ARCBIOS_STDIN, &c, 1, &count);
    228 		*cp = c;
    229 
    230 		return 1;
    231 	}
    232 
    233 	return 0;
    234 }
    235 
    236 void
    237 arcbios_tty_poll(void *v)
    238 {
    239 	struct tty *tp = v;
    240 	int c, l_r;
    241 
    242 	while (arcbios_tty_getchar(&c)) {
    243 		if (tp->t_state & TS_ISOPEN)
    244 			l_r = (*tp->t_linesw->l_rint)(c, tp);
    245 	}
    246 	callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    247 }
    248 
    249 struct tty *
    250 arcbios_ttytty(dev_t dev)
    251 {
    252 
    253 	if (minor(dev) != 0)
    254 		panic("arcbios_ttytty: bogus");
    255 
    256 	return (arcbios_tty[0]);
    257 }
    258