sys/arch/sparc64/dev/pcons.c

   1 /*      $NetBSD: pcons.c,v 1.28 2007/11/19 18:51:43 ad Exp $    */
   2
   3 /*-
   4  * Copyright (c) 2000 Eduardo E. Horvath
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  23  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  25  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 /*
  32  * Default console driver.  Uses the PROM or whatever
  33  * driver(s) are appropriate.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 __KERNEL_RCSID(0, "$NetBSD: pcons.c,v 1.28 2007/11/19 18:51:43 ad Exp $");
  38
  39 #include "opt_ddb.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/conf.h>
  44 #include <sys/device.h>
  45 #include <sys/file.h>
  46 #include <sys/ioctl.h>
  47 #include <sys/kernel.h>
  48 #include <sys/proc.h>
  49 #include <sys/tty.h>
  50 #include <sys/time.h>
  51 #include <sys/syslog.h>
  52 #include <sys/kauth.h>
  53
  54 #include <machine/autoconf.h>
  55 #include <machine/openfirm.h>
  56 #include <machine/cpu.h>
  57 #include <machine/eeprom.h>
  58 #include <machine/psl.h>
  59
  60 #include <dev/cons.h>
  61
  62 #include <sparc64/dev/cons.h>
  63
  64 static int pconsmatch(struct device *, struct cfdata *, void *);
  65 static void pconsattach(struct device *, struct device *, void *);
  66
  67 CFATTACH_DECL(pcons, sizeof(struct pconssoftc),
  68     pconsmatch, pconsattach, NULL, NULL);
  69
  70 extern struct cfdriver pcons_cd;
  71
  72 dev_type_open(pconsopen);
  73 dev_type_close(pconsclose);
  74 dev_type_read(pconsread);
  75 dev_type_write(pconswrite);
  76 dev_type_ioctl(pconsioctl);
  77 dev_type_tty(pconstty);
  78 dev_type_poll(pconspoll);
  79
  80 const struct cdevsw pcons_cdevsw = {
  81         pconsopen, pconsclose, pconsread, pconswrite, pconsioctl,
  82         nostop, pconstty, pconspoll, nommap, ttykqfilter, D_TTY
  83 };
  84
  85 static struct cnm_state pcons_cnm_state;
  86
  87 static int pconsprobe(void);
  88 extern struct consdev *cn_tab;
  89
  90 static int
  91 pconsmatch(struct device *parent, struct cfdata *match, void *aux)
  92 {
  93         struct mainbus_attach_args *ma = aux;
  94         extern int  prom_cngetc(dev_t);
  95
  96         /* Only attach if no other console has attached. */
  97         return ((strcmp("pcons", ma->ma_name) == 0) &&
  98                 (cn_tab->cn_getc == prom_cngetc));
  99
 100 }
 101
 102 static void
 103 pconsattach(struct device *parent, struct device *self, void *aux)
 104 {
 105         struct pconssoftc *sc = (struct pconssoftc *) self;
 106
 107         printf("\n");
 108         if (!pconsprobe())
 109                 return;
 110
 111         cn_init_magic(&pcons_cnm_state);
 112         cn_set_magic("+++++");
 113         callout_init(&sc->sc_poll_ch, 0);
 114 }
 115
 116 static void pconsstart(struct tty *);
 117 static int pconsparam(struct tty *, struct termios *);
 118 static void pcons_poll(void *);
 119
 120 int
 121 pconsopen(dev_t dev, int flag, int mode, struct lwp *l)
 122 {
 123         struct pconssoftc *sc;
 124         struct tty *tp;
 125         struct proc *p;
 126
 127         p = l->l_proc;
 128
 129         sc = device_lookup_private(&pcons_cd, minor(dev));
 130         if (!sc)
 131                 return ENXIO;
 132         if (!(tp = sc->of_tty))
 133                 sc->of_tty = tp = ttymalloc();
 134         tp->t_oproc = pconsstart;
 135         tp->t_param = pconsparam;
 136         tp->t_dev = dev;
 137         cn_tab->cn_dev = dev;
 138         if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
 139                 return (EBUSY);
 140         if (!(tp->t_state & TS_ISOPEN)) {
 141                 ttychars(tp);
 142                 tp->t_iflag = TTYDEF_IFLAG;
 143                 tp->t_oflag = TTYDEF_OFLAG;
 144                 tp->t_cflag = TTYDEF_CFLAG;
 145                 tp->t_lflag = TTYDEF_LFLAG;
 146                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
 147                 pconsparam(tp, &tp->t_termios);
 148                 ttsetwater(tp);
 149         }
 150         tp->t_state |= TS_CARR_ON;
 151
 152         if (!(sc->of_flags & OFPOLL)) {
 153                 sc->of_flags |= OFPOLL;
 154                 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
 155         }
 156
 157         return (*tp->t_linesw->l_open)(dev, tp);
 158 }
 159
 160 int
 161 pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
 162 {
 163         struct pconssoftc *sc = device_lookup_private(&pcons_cd,minor(dev));
 164         struct tty *tp = sc->of_tty;
 165
 166         callout_stop(&sc->sc_poll_ch);
 167         sc->of_flags &= ~OFPOLL;
 168         (*tp->t_linesw->l_close)(tp, flag);
 169         ttyclose(tp);
 170         return 0;
 171 }
 172
 173 int
 174 pconsread(dev_t dev, struct uio *uio, int flag)
 175 {
 176         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 177         struct tty *tp = sc->of_tty;
 178
 179         return (*tp->t_linesw->l_read)(tp, uio, flag);
 180 }
 181
 182 int
 183 pconswrite(dev_t dev, struct uio *uio, int flag)
 184 {
 185         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 186         struct tty *tp = sc->of_tty;
 187
 188         return (*tp->t_linesw->l_write)(tp, uio, flag);
 189 }
 190
 191 int
 192 pconspoll(dev_t dev, int events, struct lwp *l)
 193 {
 194         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 195         struct tty *tp = sc->of_tty;
 196
 197         return ((*tp->t_linesw->l_poll)(tp, events, l));
 198 }
 199
 200 int
 201 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
 202 {
 203         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 204         struct tty *tp = sc->of_tty;
 205         int error;
 206
 207         if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH)
 208                 return error;
 209         return ttioctl(tp, cmd, data, flag, l);
 210 }
 211
 212 struct tty *
 213 pconstty(dev_t dev)
 214 {
 215         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 216
 217         return sc->of_tty;
 218 }
 219
 220 static void
 221 pconsstart(struct tty *tp)
 222 {
 223         struct clist *cl;
 224         int s, len;
 225         u_char buf[OFBURSTLEN];
 226
 227         s = spltty();
 228         if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
 229                 splx(s);
 230                 return;
 231         }
 232         tp->t_state |= TS_BUSY;
 233         splx(s);
 234         cl = &tp->t_outq;
 235         len = q_to_b(cl, buf, OFBURSTLEN);
 236         prom_write(prom_stdout(), buf, len);
 237         s = spltty();
 238         tp->t_state &= ~TS_BUSY;
 239         if (ttypull(tp)) {
 240                 tp->t_state |= TS_TIMEOUT;
 241                 callout_schedule(&tp->t_rstrt_ch, 1);
 242         }
 243         splx(s);
 244 }
 245
 246 static int
 247 pconsparam(struct tty *tp, struct termios *t)
 248 {
 249         tp->t_ispeed = t->c_ispeed;
 250         tp->t_ospeed = t->c_ospeed;
 251         tp->t_cflag = t->c_cflag;
 252         return 0;
 253 }
 254
 255 static void
 256 pcons_poll(void *aux)
 257 {
 258         struct pconssoftc *sc = aux;
 259         struct tty *tp = sc->of_tty;
 260         char ch;
 261
 262         while (prom_read(prom_stdin(), &ch, 1) > 0) {
 263                 cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
 264                 if (tp && (tp->t_state & TS_ISOPEN))
 265                         (*tp->t_linesw->l_rint)(ch, tp);
 266         }
 267         callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
 268 }
 269
 270 int
 271 pconsprobe(void)
 272 {
 273
 274         return (prom_stdin() && prom_stdout());
 275 }
 276
 277 void
 278 pcons_cnpollc(dev_t dev, int on)
 279 {
 280         struct pconssoftc *sc;
 281
 282         sc = device_lookup_private(&pcons_cd, minor(dev));
 283         if (sc == NULL)
 284                 return;
 285
 286         if (on) {
 287                 if (sc->of_flags & OFPOLL)
 288                         callout_stop(&sc->sc_poll_ch);
 289                 sc->of_flags &= ~OFPOLL;
 290         } else {
 291                 /* Resuming kernel. */
 292                 if (!(sc->of_flags & OFPOLL)) {
 293                         sc->of_flags |= OFPOLL;
 294                         callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
 295                 }
 296         }
 297 }
 298
 299 void pcons_dopoll(void);
 300 void
 301 pcons_dopoll(void)
 302 {
 303                 pcons_poll(device_lookup_private(&pcons_cd, 0));
 304 }