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arcbios_tty.c revision 1.6.6.4 
      1 /*	$NetBSD: arcbios_tty.c,v 1.6.6.4 2005/11/10 14:03:54 skrll 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 1.6.6.4 2005/11/10 14:03:54 skrll 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 
     44 #include <dev/cons.h>
     45 
     46 #include <dev/arcbios/arcbios.h>
     47 #include <dev/arcbios/arcbiosvar.h>
     48 
     49 struct callout arcbios_tty_ch = CALLOUT_INITIALIZER;
     50 
     51 static struct tty *arcbios_tty[1];
     52 
     53 void	arcbios_tty_start(struct tty *);
     54 void	arcbios_tty_poll(void *);
     55 int	arcbios_tty_param(struct tty *, struct termios *);
     56 
     57 dev_type_open(arcbios_ttyopen);
     58 dev_type_close(arcbios_ttyclose);
     59 dev_type_read(arcbios_ttyread);
     60 dev_type_write(arcbios_ttywrite);
     61 dev_type_ioctl(arcbios_ttyioctl);
     62 dev_type_stop(arcbios_ttystop);
     63 dev_type_tty(arcbios_ttytty);
     64 dev_type_poll(arcbios_ttypoll);
     65 
     66 const struct cdevsw arcbios_cdevsw = {
     67 	arcbios_ttyopen, arcbios_ttyclose, arcbios_ttyread, arcbios_ttywrite,
     68 	arcbios_ttyioctl, arcbios_ttystop, arcbios_ttytty, arcbios_ttypoll,
     69 	nommap, ttykqfilter, D_TTY,
     70 };
     71 
     72 int
     73 arcbios_ttyopen(dev_t dev, int flag, int mode, struct lwp *l)
     74 {
     75 	int unit = minor(dev);
     76 	struct tty *tp;
     77 	int s, error = 0, setuptimeout = 0;
     78 
     79 	if (unit != 0)
     80 		return (ENODEV);
     81 
     82 	s = spltty();
     83 
     84 	if (arcbios_tty[unit] == NULL) {
     85 		tp = arcbios_tty[unit] = ttymalloc();
     86 		tty_attach(tp);
     87 	} else
     88 		tp = arcbios_tty[unit];
     89 
     90 	tp->t_oproc = arcbios_tty_start;
     91 	tp->t_param = arcbios_tty_param;
     92 	tp->t_dev = dev;
     93 	if ((tp->t_state & TS_ISOPEN) == 0) {
     94 		tp->t_state |= TS_CARR_ON;
     95 		ttychars(tp);
     96 		tp->t_iflag = TTYDEF_IFLAG;
     97 		tp->t_oflag = TTYDEF_OFLAG;
     98 		tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
     99 		tp->t_lflag = TTYDEF_LFLAG;
    100 		tp->t_ispeed = tp->t_ospeed = 9600;
    101 		ttsetwater(tp);
    102 
    103 		setuptimeout = 1;
    104 	} else if (tp->t_state & TS_XCLUDE &&
    105 	           suser(l->l_proc->p_ucred, &l->l_proc->p_acflag) != 0) {
    106 		splx(s);
    107 		return (EBUSY);
    108 	}
    109 
    110 	splx(s);
    111 
    112 	error = (*tp->t_linesw->l_open)(dev, tp);
    113 	if (error == 0 && setuptimeout)
    114 		callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    115 
    116 	return (error);
    117 }
    118 
    119 int
    120 arcbios_ttyclose(dev_t dev, int flag, int mode, struct lwp *l)
    121 {
    122 	int unit = minor(dev);
    123 	struct tty *tp = arcbios_tty[unit];
    124 
    125 	callout_stop(&arcbios_tty_ch);
    126 	(*tp->t_linesw->l_close)(tp, flag);
    127 	ttyclose(tp);
    128 	return (0);
    129 }
    130 
    131 int
    132 arcbios_ttyread(dev_t dev, struct uio *uio, int flag)
    133 {
    134 	struct tty *tp = arcbios_tty[minor(dev)];
    135 
    136 	return ((*tp->t_linesw->l_read)(tp, uio, flag));
    137 }
    138 
    139 int
    140 arcbios_ttywrite(dev_t dev, struct uio *uio, int flag)
    141 {
    142 	struct tty *tp = arcbios_tty[minor(dev)];
    143 
    144 	return ((*tp->t_linesw->l_write)(tp, uio, flag));
    145 }
    146 
    147 int
    148 arcbios_ttypoll(dev_t dev, int events, struct lwp *l)
    149 {
    150 	struct tty *tp = arcbios_tty[minor(dev)];
    151 
    152 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    153 }
    154 
    155 int
    156 arcbios_ttyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
    157 {
    158 	int unit = minor(dev);
    159 	struct tty *tp = arcbios_tty[unit];
    160 	int error;
    161 
    162 	error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
    163 	if (error != EPASSTHROUGH)
    164 		return (error);
    165 	return (ttioctl(tp, cmd, data, flag, l));
    166 }
    167 
    168 int
    169 arcbios_tty_param(struct tty *tp, struct termios *t)
    170 {
    171 
    172 	return (0);
    173 }
    174 
    175 void
    176 arcbios_tty_start(struct tty *tp)
    177 {
    178 	u_long count;
    179 	int s;
    180 
    181 	s = spltty();
    182 	if (tp->t_state & (TS_TTSTOP | TS_BUSY))
    183 		goto out;
    184 	if (tp->t_outq.c_cc <= tp->t_lowat) {
    185 		if (tp->t_state & TS_ASLEEP) {
    186 			tp->t_state &= ~TS_ASLEEP;
    187 			wakeup((caddr_t)&tp->t_outq);
    188 		}
    189 		selwakeup(&tp->t_wsel);
    190 	}
    191 	tp->t_state |= TS_BUSY;
    192 	while (tp->t_outq.c_cc != 0) {
    193 		(*ARCBIOS->Write)(ARCBIOS_STDOUT, tp->t_outq.c_cf,
    194 		    ndqb(&tp->t_outq, 0), &count);
    195 		ndflush(&tp->t_outq, count);
    196 	}
    197 	tp->t_state &= ~TS_BUSY;
    198  out:
    199 	splx(s);
    200 }
    201 
    202 void
    203 arcbios_ttystop(struct tty *tp, int flag)
    204 {
    205 	int s;
    206 
    207 	s = spltty();
    208 	if (tp->t_state & TS_BUSY)
    209 		if ((tp->t_state & TS_TTSTOP) == 0)
    210 			tp->t_state |= TS_FLUSH;
    211 	splx(s);
    212 }
    213 
    214 static int
    215 arcbios_tty_getchar(int *cp)
    216 {
    217 	char c;
    218 	int32_t q;
    219 	u_long count;
    220 
    221 	q = ARCBIOS->GetReadStatus(ARCBIOS_STDIN);
    222 
    223 	if (q == 0) {
    224 		ARCBIOS->Read(ARCBIOS_STDIN, &c, 1, &count);
    225 		*cp = c;
    226 
    227 		return 1;
    228 	}
    229 
    230 	return 0;
    231 }
    232 
    233 void
    234 arcbios_tty_poll(void *v)
    235 {
    236 	struct tty *tp = v;
    237 	int c, l_r;
    238 
    239 	while (arcbios_tty_getchar(&c)) {
    240 		if (tp->t_state & TS_ISOPEN)
    241 			l_r = (*tp->t_linesw->l_rint)(c, tp);
    242 	}
    243 	callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    244 }
    245 
    246 struct tty *
    247 arcbios_ttytty(dev_t dev)
    248 {
    249 
    250 	if (minor(dev) != 0)
    251 		panic("arcbios_ttytty: bogus");
    252 
    253 	return (arcbios_tty[0]);
    254 }
    255