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      1 /*	$NetBSD: arcbios_tty.c,v 1.25 2014/07/25 08:10:36 dholland 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 1.25 2014/07/25 08:10:36 dholland 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_discard = nodiscard,
     78 	.d_flag = D_TTY,
     79 };
     80 
     81 int
     82 arcbios_ttyopen(dev_t dev, int flag, int mode, struct lwp *l)
     83 {
     84 	int unit = minor(dev);
     85 	struct tty *tp;
     86 	int s, error = 0, setuptimeout = 0;
     87 
     88 	if (!arcbios_ch_init) {
     89 		arcbios_ch_init = true;
     90 		callout_init(&arcbios_tty_ch, 0);
     91 	}
     92 
     93 	if (unit != 0)
     94 		return (ENODEV);
     95 
     96 	s = spltty();
     97 
     98 	if (arcbios_tty[unit] == NULL) {
     99 		tp = arcbios_tty[unit] = tty_alloc();
    100 		tty_attach(tp);
    101 	} else
    102 		tp = arcbios_tty[unit];
    103 
    104 	tp->t_oproc = arcbios_tty_start;
    105 	tp->t_param = arcbios_tty_param;
    106 	tp->t_dev = dev;
    107 
    108 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) {
    109 		splx(s);
    110 		return (EBUSY);
    111 	}
    112 
    113 	if ((tp->t_state & TS_ISOPEN) == 0) {
    114 		tp->t_state |= TS_CARR_ON;
    115 		ttychars(tp);
    116 		tp->t_iflag = TTYDEF_IFLAG;
    117 		tp->t_oflag = TTYDEF_OFLAG;
    118 		tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
    119 		tp->t_lflag = TTYDEF_LFLAG;
    120 		tp->t_ispeed = tp->t_ospeed = 9600;
    121 		ttsetwater(tp);
    122 
    123 		setuptimeout = 1;
    124 	}
    125 
    126 	splx(s);
    127 
    128 	error = (*tp->t_linesw->l_open)(dev, tp);
    129 	if (error == 0 && setuptimeout)
    130 		callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    131 
    132 	return (error);
    133 }
    134 
    135 int
    136 arcbios_ttyclose(dev_t dev, int flag, int mode, struct lwp *l)
    137 {
    138 	int unit = minor(dev);
    139 	struct tty *tp = arcbios_tty[unit];
    140 
    141 	callout_stop(&arcbios_tty_ch);
    142 	(*tp->t_linesw->l_close)(tp, flag);
    143 	ttyclose(tp);
    144 	return (0);
    145 }
    146 
    147 int
    148 arcbios_ttyread(dev_t dev, struct uio *uio, int flag)
    149 {
    150 	struct tty *tp = arcbios_tty[minor(dev)];
    151 
    152 	return ((*tp->t_linesw->l_read)(tp, uio, flag));
    153 }
    154 
    155 int
    156 arcbios_ttywrite(dev_t dev, struct uio *uio, int flag)
    157 {
    158 	struct tty *tp = arcbios_tty[minor(dev)];
    159 
    160 	return ((*tp->t_linesw->l_write)(tp, uio, flag));
    161 }
    162 
    163 int
    164 arcbios_ttypoll(dev_t dev, int events, struct lwp *l)
    165 {
    166 	struct tty *tp = arcbios_tty[minor(dev)];
    167 
    168 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    169 }
    170 
    171 int
    172 arcbios_ttyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    173 {
    174 	int unit = minor(dev);
    175 	struct tty *tp = arcbios_tty[unit];
    176 	int error;
    177 
    178 	error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
    179 	if (error != EPASSTHROUGH)
    180 		return (error);
    181 	return (ttioctl(tp, cmd, data, flag, l));
    182 }
    183 
    184 int
    185 arcbios_tty_param(struct tty *tp, struct termios *t)
    186 {
    187 
    188 	return (0);
    189 }
    190 
    191 void
    192 arcbios_tty_start(struct tty *tp)
    193 {
    194 	u_long count;
    195 	int s;
    196 
    197 	s = spltty();
    198 	if (tp->t_state & (TS_TTSTOP | TS_BUSY))
    199 		goto out;
    200 	ttypull(tp);
    201 	tp->t_state |= TS_BUSY;
    202 	while (tp->t_outq.c_cc != 0) {
    203 		arcbios_Write(ARCBIOS_STDOUT, tp->t_outq.c_cf,
    204 		    ndqb(&tp->t_outq, 0), &count);
    205 		ndflush(&tp->t_outq, count);
    206 	}
    207 	tp->t_state &= ~TS_BUSY;
    208  out:
    209 	splx(s);
    210 }
    211 
    212 void
    213 arcbios_ttystop(struct tty *tp, int flag)
    214 {
    215 	int s;
    216 
    217 	s = spltty();
    218 	if (tp->t_state & TS_BUSY)
    219 		if ((tp->t_state & TS_TTSTOP) == 0)
    220 			tp->t_state |= TS_FLUSH;
    221 	splx(s);
    222 }
    223 
    224 static int
    225 arcbios_tty_getchar(int *cp)
    226 {
    227 	char c;
    228 	int32_t q;
    229 	u_long count;
    230 
    231 	q = arcbios_GetReadStatus(ARCBIOS_STDIN);
    232 
    233 	if (q == 0) {
    234 		arcbios_Read(ARCBIOS_STDIN, &c, 1, &count);
    235 		*cp = c;
    236 
    237 		return 1;
    238 	}
    239 
    240 	return 0;
    241 }
    242 
    243 void
    244 arcbios_tty_poll(void *v)
    245 {
    246 	struct tty *tp = v;
    247 	int c;
    248 
    249 	while (arcbios_tty_getchar(&c)) {
    250 		if (tp->t_state & TS_ISOPEN)
    251 			(void)(*tp->t_linesw->l_rint)(c, tp);
    252 	}
    253 	callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    254 }
    255 
    256 struct tty *
    257 arcbios_ttytty(dev_t dev)
    258 {
    259 
    260 	if (minor(dev) != 0)
    261 		panic("arcbios_ttytty: bogus");
    262 
    263 	return (arcbios_tty[0]);
    264 }
    265