sys/arch/sun2/dev/pcons.c

   1 /*      $NetBSD: pcons.c,v 1.18 2008/06/13 13:11:26 cegger 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 1.18 2008/06/13 13:11:26 cegger 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/promlib.h>
  56 #include <machine/cpu.h>
  57 #include <machine/psl.h>
  58
  59 #include <dev/cons.h>
  60
  61 #include <sun2/dev/cons.h>
  62
  63 #include "ioconf.h"
  64
  65 static int pconsmatch(device_t, cfdata_t, void *);
  66 static void pconsattach(device_t, device_t, void *);
  67
  68 CFATTACH_DECL_NEW(pcons, sizeof(struct pconssoftc),
  69     pconsmatch, pconsattach, NULL, NULL);
  70
  71 static struct cnm_state pcons_cnm_state;
  72
  73 static int pconsprobe(void);
  74
  75 dev_type_open(pconsopen);
  76 dev_type_close(pconsclose);
  77 dev_type_read(pconsread);
  78 dev_type_write(pconswrite);
  79 dev_type_ioctl(pconsioctl);
  80 dev_type_tty(pconstty);
  81 dev_type_poll(pconspoll);
  82
  83 const struct cdevsw pcons_cdevsw = {
  84         pconsopen, pconsclose, pconsread, pconswrite, pconsioctl,
  85         nostop, pconstty, pconspoll, nommap, ttykqfilter, D_TTY
  86 };
  87
  88 static int
  89 pconsmatch(device_t parent, cfdata_t cf, void *aux)
  90 {
  91         struct mainbus_attach_args *ma = aux;
  92         extern int prom_cngetc(dev_t);
  93
  94         /* Only attach if no other console has attached. */
  95         return (ma->ma_name != NULL) &&
  96             (strcmp("pcons", ma->ma_name) == 0) &&
  97             (cn_tab->cn_getc == prom_cngetc);
  98
  99 }
 100
 101 static void
 102 pconsattach(device_t parent, device_t self, void *aux)
 103 {
 104         struct pconssoftc *sc = device_private(self);
 105
 106         aprint_normal("\n");
 107         if (!pconsprobe())
 108                 return;
 109
 110         cn_init_magic(&pcons_cnm_state);
 111         cn_set_magic("+++++");
 112         callout_init(&sc->sc_poll_ch, 0);
 113 }
 114
 115 static void pconsstart(struct tty *);
 116 static int pconsparam(struct tty *, struct termios *);
 117 static void pcons_poll(void *);
 118
 119 int
 120 pconsopen(dev_t dev, int flag, int mode, struct lwp *l)
 121 {
 122         struct pconssoftc *sc;
 123         struct tty *tp;
 124
 125         sc = device_lookup_private(&pcons_cd, minor(dev));
 126         if (sc == NULL)
 127                 return ENXIO;
 128         if ((tp = sc->of_tty) == NULL)
 129                 sc->of_tty = tp = ttymalloc();
 130         tp->t_oproc = pconsstart;
 131         tp->t_param = pconsparam;
 132         tp->t_dev = dev;
 133         cn_tab->cn_dev = dev;
 134         if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
 135                 return (EBUSY);
 136         if ((tp->t_state & TS_ISOPEN) == 0) {
 137                 ttychars(tp);
 138                 tp->t_iflag = TTYDEF_IFLAG;
 139                 tp->t_oflag = TTYDEF_OFLAG;
 140                 tp->t_cflag = TTYDEF_CFLAG;
 141                 tp->t_lflag = TTYDEF_LFLAG;
 142                 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
 143                 pconsparam(tp, &tp->t_termios);
 144                 ttsetwater(tp);
 145         }
 146         tp->t_state |= TS_CARR_ON;
 147
 148         if ((sc->of_flags & OFPOLL) == 0) {
 149                 sc->of_flags |= OFPOLL;
 150                 callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
 151         }
 152
 153         return (*tp->t_linesw->l_open)(dev, tp);
 154 }
 155
 156 int
 157 pconsclose(dev_t dev, int flag, int mode, struct lwp *l)
 158 {
 159         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 160         struct tty *tp = sc->of_tty;
 161
 162         callout_stop(&sc->sc_poll_ch);
 163         sc->of_flags &= ~OFPOLL;
 164         (*tp->t_linesw->l_close)(tp, flag);
 165         ttyclose(tp);
 166         return 0;
 167 }
 168
 169 int
 170 pconsread(dev_t dev, struct uio *uio, int flag)
 171 {
 172         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 173         struct tty *tp = sc->of_tty;
 174
 175         return (*tp->t_linesw->l_read)(tp, uio, flag);
 176 }
 177
 178 int
 179 pconswrite(dev_t dev, struct uio *uio, int flag)
 180 {
 181         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 182         struct tty *tp = sc->of_tty;
 183
 184         return (*tp->t_linesw->l_write)(tp, uio, flag);
 185 }
 186
 187 int
 188 pconspoll(dev_t dev, int events, struct lwp *l)
 189 {
 190         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 191         struct tty *tp = sc->of_tty;
 192
 193         return (*tp->t_linesw->l_poll)(tp, events, l);
 194 }
 195
 196 int
 197 pconsioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
 198 {
 199         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 200         struct tty *tp = sc->of_tty;
 201         int error;
 202
 203         if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) >= 0)
 204                 return error;
 205         if ((error = ttioctl(tp, cmd, data, flag, l)) >= 0)
 206                 return error;
 207         return ENOTTY;
 208 }
 209
 210 struct tty *
 211 pconstty(dev_t dev)
 212 {
 213         struct pconssoftc *sc = device_lookup_private(&pcons_cd, minor(dev));
 214
 215         return sc->of_tty;
 216 }
 217
 218 static void
 219 pconsstart(struct tty *tp)
 220 {
 221         struct clist *cl;
 222         int s, len;
 223         uint8_t buf[OFBURSTLEN];
 224
 225         s = spltty();
 226         if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
 227                 splx(s);
 228                 return;
 229         }
 230         tp->t_state |= TS_BUSY;
 231         splx(s);
 232         cl = &tp->t_outq;
 233         len = q_to_b(cl, buf, OFBURSTLEN);
 234         prom_putstr(buf, len);
 235         s = spltty();
 236         tp->t_state &= ~TS_BUSY;
 237         if (ttypull(tp)) {
 238                 tp->t_state |= TS_TIMEOUT;
 239                 callout_schedule(&tp->t_rstrt_ch, 1);
 240         }
 241         splx(s);
 242 }
 243
 244 static int
 245 pconsparam(struct tty *tp, struct termios *t)
 246 {
 247
 248         tp->t_ispeed = t->c_ispeed;
 249         tp->t_ospeed = t->c_ospeed;
 250         tp->t_cflag = t->c_cflag;
 251         return 0;
 252 }
 253
 254 static void
 255 pcons_poll(void *aux)
 256 {
 257         struct pconssoftc *sc = aux;
 258         struct tty *tp = sc->of_tty;
 259         int c;
 260         char ch;
 261
 262         while ((c = prom_peekchar()) >= 0) {
 263                 ch = c;
 264                 cn_check_magic(tp->t_dev, ch, pcons_cnm_state);
 265                 if (tp && (tp->t_state & TS_ISOPEN))
 266                         (*tp->t_linesw->l_rint)(ch, tp);
 267         }
 268         callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
 269 }
 270
 271 int
 272 pconsprobe(void)
 273 {
 274
 275         switch (prom_version()) {
 276 #ifdef  PROM_OLDMON
 277         case PROM_OLDMON:
 278         case PROM_OBP_V0:
 279                 return 1;
 280 #endif  /* PROM_OLDMON */
 281 #ifdef  PROM_OBP_V2
 282         case PROM_OBP_V2:
 283         case PROM_OBP_V3:
 284         case PROM_OPENFIRM:
 285                 return prom_stdin() && prom_stdout();
 286 #endif  /* PROM_OBP_V2 */
 287         default:
 288                 break;
 289         }
 290         return 0;
 291 }
 292
 293 void
 294 pcons_cnpollc(dev_t dev, int on)
 295 {
 296         struct pconssoftc *sc;
 297
 298         sc = device_lookup_private(&pcons_cd, minor(dev));
 299         if (sc == NULL)
 300                 return;
 301
 302         if (on) {
 303                 if (sc->of_flags & OFPOLL)
 304                         callout_stop(&sc->sc_poll_ch);
 305                 sc->of_flags &= ~OFPOLL;
 306         } else {
 307                 /* Resuming kernel. */
 308                 if ((sc->of_flags & OFPOLL) == 0) {
 309                         sc->of_flags |= OFPOLL;
 310                         callout_reset(&sc->sc_poll_ch, 1, pcons_poll, sc);
 311                 }
 312         }
 313 }
 314
 315 void pcons_dopoll(void);
 316
 317 void
 318 pcons_dopoll(void)
 319 {
 320
 321         pcons_poll(device_lookup_private(&pcons_cd, 0));
 322 }