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      1 /* $NetBSD: promcons.c,v 1.41 2020/09/03 02:09:09 thorpej 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>			/* RCS ID & Copyright macro defns */
     31 
     32 __KERNEL_RCSID(0, "$NetBSD: promcons.c,v 1.41 2020/09/03 02:09:09 thorpej Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/ioctl.h>
     37 #include <sys/select.h>
     38 #include <sys/tty.h>
     39 #include <sys/proc.h>
     40 #include <sys/file.h>
     41 #include <sys/uio.h>
     42 #include <sys/kernel.h>
     43 #include <sys/syslog.h>
     44 #include <sys/types.h>
     45 #include <sys/device.h>
     46 #include <sys/conf.h>
     47 #include <sys/kauth.h>
     48 
     49 #include <uvm/uvm_extern.h>
     50 
     51 #include <machine/cpuconf.h>
     52 #include <machine/prom.h>
     53 
     54 #ifndef CONSPEED
     55 #define	CONSPEED 9600
     56 #endif
     57 
     58 #ifdef _PROM_MAY_USE_PROM_CONSOLE
     59 
     60 dev_type_open(promopen);
     61 dev_type_close(promclose);
     62 dev_type_read(promread);
     63 dev_type_write(promwrite);
     64 dev_type_ioctl(promioctl);
     65 dev_type_stop(promstop);
     66 dev_type_tty(promtty);
     67 dev_type_poll(prompoll);
     68 
     69 const struct cdevsw prom_cdevsw = {
     70 	.d_open = promopen,
     71 	.d_close = promclose,
     72 	.d_read = promread,
     73 	.d_write = promwrite,
     74 	.d_ioctl = promioctl,
     75 	.d_stop = promstop,
     76 	.d_tty = promtty,
     77 	.d_poll = prompoll,
     78 	.d_mmap = nommap,
     79 	.d_kqfilter = ttykqfilter,
     80 	.d_discard = nodiscard,
     81 	.d_flag = D_TTY
     82 };
     83 
     84 #define	PROM_POLL_HZ	50
     85 
     86 static struct  tty *prom_tty[1];
     87 static int polltime;
     88 
     89 void	promstart(struct tty *);
     90 void	promtimeout(void *);
     91 int	promparam(struct tty *, struct termios *);
     92 
     93 struct callout prom_ch;
     94 
     95 int
     96 promopen(dev_t dev, int flag, int mode, struct lwp *l)
     97 {
     98 	int unit = minor(dev);
     99 	struct tty *tp;
    100 	int s;
    101 	int error = 0, setuptimeout = 0;
    102 	static bool callo;
    103 
    104 	if (!callo) {
    105 		callout_init(&prom_ch, 0);
    106 		callo = true;
    107 	}
    108 
    109 	if (!prom_uses_prom_console() || unit >= 1)
    110 		return ENXIO;
    111 
    112 	s = spltty();
    113 
    114 	if (!prom_tty[unit]) {
    115 		tp = prom_tty[unit] = tty_alloc();
    116 		tty_attach(tp);
    117 	} else
    118 		tp = prom_tty[unit];
    119 
    120 	tp->t_oproc = promstart;
    121 	tp->t_param = promparam;
    122 	tp->t_dev = dev;
    123 
    124 	if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) {
    125 		splx(s);
    126 		return (EBUSY);
    127 	}
    128 
    129 	if ((tp->t_state & TS_ISOPEN) == 0) {
    130 		tp->t_state |= TS_CARR_ON;
    131 		ttychars(tp);
    132 		tp->t_iflag = TTYDEF_IFLAG;
    133 		tp->t_oflag = TTYDEF_OFLAG;
    134 		tp->t_cflag = TTYDEF_CFLAG|CLOCAL;
    135 		tp->t_lflag = TTYDEF_LFLAG;
    136 		tp->t_ispeed = tp->t_ospeed = CONSPEED;
    137 		ttsetwater(tp);
    138 
    139 		setuptimeout = 1;
    140 	}
    141 
    142 	splx(s);
    143 
    144 	error = (*tp->t_linesw->l_open)(dev, tp);
    145 	if (error == 0 && setuptimeout) {
    146 		polltime = hz / PROM_POLL_HZ;
    147 		if (polltime < 1)
    148 			polltime = 1;
    149 		callout_reset(&prom_ch, polltime, promtimeout, tp);
    150 	}
    151 	return error;
    152 }
    153 
    154 int
    155 promclose(dev_t dev, int flag, int mode, struct lwp *l)
    156 {
    157 	int unit = minor(dev);
    158 	struct tty *tp = prom_tty[unit];
    159 
    160 	callout_stop(&prom_ch);
    161 	(*tp->t_linesw->l_close)(tp, flag);
    162 	ttyclose(tp);
    163 	return 0;
    164 }
    165 
    166 int
    167 promread(dev_t dev, struct uio *uio, int flag)
    168 {
    169 	struct tty *tp = prom_tty[minor(dev)];
    170 
    171 	return ((*tp->t_linesw->l_read)(tp, uio, flag));
    172 }
    173 
    174 int
    175 promwrite(dev_t dev, struct uio *uio, int flag)
    176 {
    177 	struct tty *tp = prom_tty[minor(dev)];
    178 
    179 	return ((*tp->t_linesw->l_write)(tp, uio, flag));
    180 }
    181 
    182 int
    183 prompoll(dev_t dev, int events, struct lwp *l)
    184 {
    185 	struct tty *tp = prom_tty[minor(dev)];
    186 
    187 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    188 }
    189 
    190 int
    191 promioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
    192 {
    193 	int unit = minor(dev);
    194 	struct tty *tp = prom_tty[unit];
    195 	int error;
    196 
    197 	error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
    198 	if (error != EPASSTHROUGH)
    199 		return error;
    200 	return ttioctl(tp, cmd, data, flag, l);
    201 }
    202 
    203 int
    204 promparam(struct tty *tp, struct termios *t)
    205 {
    206 
    207 	return 0;
    208 }
    209 
    210 void
    211 promstart(struct tty *tp)
    212 {
    213 	int s;
    214 
    215 	s = spltty();
    216 	if (tp->t_state & (TS_TTSTOP | TS_BUSY))
    217 		goto out;
    218 	ttypull(tp);
    219 	tp->t_state |= TS_BUSY;
    220 	while (tp->t_outq.c_cc != 0)
    221 		promcnputc(tp->t_dev, getc(&tp->t_outq));
    222 	tp->t_state &= ~TS_BUSY;
    223 out:
    224 	splx(s);
    225 }
    226 
    227 /*
    228  * Stop output on a line.
    229  */
    230 void
    231 promstop(struct tty *tp, int flag)
    232 {
    233 	int s;
    234 
    235 	s = spltty();
    236 	if (tp->t_state & TS_BUSY)
    237 		if ((tp->t_state & TS_TTSTOP) == 0)
    238 			tp->t_state |= TS_FLUSH;
    239 	splx(s);
    240 }
    241 
    242 void
    243 promtimeout(void *v)
    244 {
    245 	struct tty *tp = v;
    246 	u_char c;
    247 
    248 	while (promcnlookc(tp->t_dev, &c)) {
    249 		if (tp->t_state & TS_ISOPEN)
    250 			(*tp->t_linesw->l_rint)(c, tp);
    251 	}
    252 	callout_reset(&prom_ch, polltime, promtimeout, tp);
    253 }
    254 
    255 struct tty *
    256 promtty(dev_t dev)
    257 {
    258 
    259 	if (minor(dev) != 0)
    260 		panic("promtty: bogus");
    261 
    262 	return prom_tty[0];
    263 }
    264 
    265 #else /* _PROM_MAY_USE_PROM_CONSOLE */
    266 
    267 /*
    268  * If not defined _PROM_MAY_USE_PROM_CONSOLE,
    269  * this fake prom_cdevsw is attached to the kernel.
    270  * NEVER REMOVE!
    271  */
    272 const struct cdevsw prom_cdevsw = {
    273 	.d_open = noopen,
    274 	.d_close = noclose,
    275 	.d_read = noread,
    276 	.d_write = nowrite,
    277 	.d_ioctl = noioctl,
    278 	.d_stop = nostop,
    279 	.d_tty = notty,
    280 	.d_poll = nopoll,
    281 	.d_mmap = nommap,
    282 	.d_kqfilter = nokqfilter,
    283 	.d_discard = nodiscard,
    284 	.d_flag = 0
    285 };
    286 
    287 #endif /* _PROM_MAY_USE_PROM_CONSOLE */
    288