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arcbios_tty.c revision 1.22.18.1 
      1 /*	$NetBSD: arcbios_tty.c,v 1.22.18.1 2014/05/18 17:45:35 rmind 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 1.22.18.1 2014/05/18 17:45:35 rmind Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/uio.h>
     35 #include <sys/systm.h>
     36 #include <sys/callout.h>
     37 #include <sys/kernel.h>
     38 #include <sys/conf.h>
     39 #include <sys/proc.h>
     40 #include <sys/tty.h>
     41 #include <sys/termios.h>
     42 #include <sys/kauth.h>
     43 
     44 #include <dev/cons.h>
     45 
     46 #include <dev/arcbios/arcbios.h>
     47 #include <dev/arcbios/arcbiosvar.h>
     48 
     49 callout_t  arcbios_tty_ch;
     50 bool arcbios_ch_init;
     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 	.d_open = arcbios_ttyopen,
     68 	.d_close = arcbios_ttyclose,
     69 	.d_read = arcbios_ttyread,
     70 	.d_write = arcbios_ttywrite,
     71 	.d_ioctl = arcbios_ttyioctl,
     72 	.d_stop = arcbios_ttystop,
     73 	.d_tty = arcbios_ttytty,
     74 	.d_poll = arcbios_ttypoll,
     75 	.d_mmap = nommap,
     76 	.d_kqfilter = ttykqfilter,
     77 	.d_flag = D_TTY,
     78 };
     79 
     80 int
     81 arcbios_ttyopen(dev_t dev, int flag, int mode, struct lwp *l)
     82 {
     83 	int unit = minor(dev);
     84 	struct tty *tp;
     85 	int s, error = 0, setuptimeout = 0;
     86 
     87 	if (!arcbios_ch_init) {
     88 		arcbios_ch_init = true;
     89 		callout_init(&arcbios_tty_ch, 0);
     90 	}
     91 
     92 	if (unit != 0)
     93 		return (ENODEV);
     94 
     95 	s = spltty();
     96 
     97 	if (arcbios_tty[unit] == NULL) {
     98 		tp = arcbios_tty[unit] = tty_alloc();
     99 		tty_attach(tp);
    100 	} else
    101 		tp = arcbios_tty[unit];
    102 
    103 	tp->t_oproc = arcbios_tty_start;
    104 	tp->t_param = arcbios_tty_param;
    105 	tp->t_dev = dev;
    106 
    107 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) {
    108 		splx(s);
    109 		return (EBUSY);
    110 	}
    111 
    112 	if ((tp->t_state & TS_ISOPEN) == 0) {
    113 		tp->t_state |= TS_CARR_ON;
    114 		ttychars(tp);
    115 		tp->t_iflag = TTYDEF_IFLAG;
    116 		tp->t_oflag = TTYDEF_OFLAG;
    117 		tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
    118 		tp->t_lflag = TTYDEF_LFLAG;
    119 		tp->t_ispeed = tp->t_ospeed = 9600;
    120 		ttsetwater(tp);
    121 
    122 		setuptimeout = 1;
    123 	}
    124 
    125 	splx(s);
    126 
    127 	error = (*tp->t_linesw->l_open)(dev, tp);
    128 	if (error == 0 && setuptimeout)
    129 		callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    130 
    131 	return (error);
    132 }
    133 
    134 int
    135 arcbios_ttyclose(dev_t dev, int flag, int mode, struct lwp *l)
    136 {
    137 	int unit = minor(dev);
    138 	struct tty *tp = arcbios_tty[unit];
    139 
    140 	callout_stop(&arcbios_tty_ch);
    141 	(*tp->t_linesw->l_close)(tp, flag);
    142 	ttyclose(tp);
    143 	return (0);
    144 }
    145 
    146 int
    147 arcbios_ttyread(dev_t dev, struct uio *uio, int flag)
    148 {
    149 	struct tty *tp = arcbios_tty[minor(dev)];
    150 
    151 	return ((*tp->t_linesw->l_read)(tp, uio, flag));
    152 }
    153 
    154 int
    155 arcbios_ttywrite(dev_t dev, struct uio *uio, int flag)
    156 {
    157 	struct tty *tp = arcbios_tty[minor(dev)];
    158 
    159 	return ((*tp->t_linesw->l_write)(tp, uio, flag));
    160 }
    161 
    162 int
    163 arcbios_ttypoll(dev_t dev, int events, struct lwp *l)
    164 {
    165 	struct tty *tp = arcbios_tty[minor(dev)];
    166 
    167 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    168 }
    169 
    170 int
    171 arcbios_ttyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    172 {
    173 	int unit = minor(dev);
    174 	struct tty *tp = arcbios_tty[unit];
    175 	int error;
    176 
    177 	error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
    178 	if (error != EPASSTHROUGH)
    179 		return (error);
    180 	return (ttioctl(tp, cmd, data, flag, l));
    181 }
    182 
    183 int
    184 arcbios_tty_param(struct tty *tp, struct termios *t)
    185 {
    186 
    187 	return (0);
    188 }
    189 
    190 void
    191 arcbios_tty_start(struct tty *tp)
    192 {
    193 	u_long count;
    194 	int s;
    195 
    196 	s = spltty();
    197 	if (tp->t_state & (TS_TTSTOP | TS_BUSY))
    198 		goto out;
    199 	ttypull(tp);
    200 	tp->t_state |= TS_BUSY;
    201 	while (tp->t_outq.c_cc != 0) {
    202 		arcbios_Write(ARCBIOS_STDOUT, tp->t_outq.c_cf,
    203 		    ndqb(&tp->t_outq, 0), &count);
    204 		ndflush(&tp->t_outq, count);
    205 	}
    206 	tp->t_state &= ~TS_BUSY;
    207  out:
    208 	splx(s);
    209 }
    210 
    211 void
    212 arcbios_ttystop(struct tty *tp, int flag)
    213 {
    214 	int s;
    215 
    216 	s = spltty();
    217 	if (tp->t_state & TS_BUSY)
    218 		if ((tp->t_state & TS_TTSTOP) == 0)
    219 			tp->t_state |= TS_FLUSH;
    220 	splx(s);
    221 }
    222 
    223 static int
    224 arcbios_tty_getchar(int *cp)
    225 {
    226 	char c;
    227 	int32_t q;
    228 	u_long count;
    229 
    230 	q = arcbios_GetReadStatus(ARCBIOS_STDIN);
    231 
    232 	if (q == 0) {
    233 		arcbios_Read(ARCBIOS_STDIN, &c, 1, &count);
    234 		*cp = c;
    235 
    236 		return 1;
    237 	}
    238 
    239 	return 0;
    240 }
    241 
    242 void
    243 arcbios_tty_poll(void *v)
    244 {
    245 	struct tty *tp = v;
    246 	int c;
    247 
    248 	while (arcbios_tty_getchar(&c)) {
    249 		if (tp->t_state & TS_ISOPEN)
    250 			(void)(*tp->t_linesw->l_rint)(c, tp);
    251 	}
    252 	callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    253 }
    254 
    255 struct tty *
    256 arcbios_ttytty(dev_t dev)
    257 {
    258 
    259 	if (minor(dev) != 0)
    260 		panic("arcbios_ttytty: bogus");
    261 
    262 	return (arcbios_tty[0]);
    263 }
    264