sys/dev/serial/cy/cy.c

   1 /*-
   2  * cyclades cyclom-y serial driver
   3  *      Andrew Herbert <andrew@werple.apana.org.au>, 17 August 1993
   4  *
   5  * Copyright (c) 1993 Andrew Herbert.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name Andrew Herbert may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY ``AS IS'' AND ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  22  * NO EVENT SHALL I BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  24  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  25  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  26  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * $FreeBSD: src/sys/i386/isa/cy.c,v 1.97.2.2 2001/08/22 13:04:58 bde Exp $
  31  * $DragonFly: src/sys/dev/serial/cy/cy.c,v 1.4 2003/07/19 21:14:34 dillon Exp $
  32  */
  33
  34 #include "opt_compat.h"
  35 #include "cy.h"
  36
  37 /*
  38  * TODO:
  39  * Atomic COR change.
  40  * Consoles.
  41  */
  42
  43 /*
  44  * Temporary compile-time configuration options.
  45  */
  46 #define RxFifoThreshold (CD1400_RX_FIFO_SIZE / 2)
  47                         /* Number of chars in the receiver FIFO before an
  48                          * an interrupt is generated.  Should depend on
  49                          * line speed.  Needs to be about 6 on a 486DX33
  50                          * for 4 active ports at 115200 bps.  Why doesn't
  51                          * 10 work?
  52                          */
  53 #define PollMode        /* Use polling-based irq service routine, not the
  54                          * hardware svcack lines.  Must be defined for
  55                          * Cyclom-16Y boards.  Less efficient for Cyclom-8Ys,
  56                          * and stops 4 * 115200 bps from working.
  57                          */
  58 #undef  Smarts          /* Enable slightly more CD1400 intelligence.  Mainly
  59                          * the output CR/LF processing, plus we can avoid a
  60                          * few checks usually done in ttyinput().
  61                          *
  62                          * XXX not fully implemented, and not particularly
  63                          * worthwhile.
  64                          */
  65 #undef  CyDebug         /* Include debugging code (not very expensive). */
  66
  67 /* These will go away. */
  68 #undef  SOFT_CTS_OFLOW
  69 #define SOFT_HOTCHAR
  70
  71 #include <sys/param.h>
  72 #include <sys/systm.h>
  73 #include <sys/tty.h>
  74 #include <sys/proc.h>
  75 #include <sys/conf.h>
  76 #include <sys/dkstat.h>
  77 #include <sys/fcntl.h>
  78 #include <sys/interrupt.h>
  79 #include <sys/kernel.h>
  80 #include <sys/malloc.h>
  81 #include <sys/syslog.h>
  82 #include <machine/clock.h>
  83 #include <machine/ipl.h>
  84 #ifndef SMP
  85 #include <machine/lock.h>
  86 #endif
  87 #include <machine/psl.h>
  88
  89 #include <i386/isa/isa_device.h>
  90 #include <i386/isa/cyreg.h>
  91 #include <i386/isa/ic/cd1400.h>
  92
  93 #ifdef SMP
  94 #define disable_intr()  COM_DISABLE_INTR()
  95 #define enable_intr()   COM_ENABLE_INTR()
  96 #endif /* SMP */
  97
  98 /*
  99  * Dictionary so that I can name everything *sio* or *com* to compare with
 100  * sio.c.  There is also lots of ugly formatting and unnecessary ifdefs to
 101  * simplify the comparision.  These will go away.
 102  */
 103 #define LSR_BI          CD1400_RDSR_BREAK
 104 #define LSR_FE          CD1400_RDSR_FE
 105 #define LSR_OE          CD1400_RDSR_OE
 106 #define LSR_PE          CD1400_RDSR_PE
 107 #define MCR_DTR         CD1400_MSVR2_DTR
 108 #define MCR_RTS         CD1400_MSVR1_RTS
 109 #define MSR_CTS         CD1400_MSVR2_CTS
 110 #define MSR_DCD         CD1400_MSVR2_CD
 111 #define MSR_DSR         CD1400_MSVR2_DSR
 112 #define MSR_RI          CD1400_MSVR2_RI
 113 #define NSIO            (NCY * CY_MAX_PORTS)
 114 #define comconsole      cyconsole
 115 #define comdefaultrate  cydefaultrate
 116 #define com_events      cy_events
 117 #define comhardclose    cyhardclose
 118 #define commctl         cymctl
 119 #define comparam        cyparam
 120 #define comspeed        cyspeed
 121 #define comstart        cystart
 122 #define comwakeup       cywakeup
 123 #define nsio_tty        ncy_tty
 124 #define p_com_addr      p_cy_addr
 125 #define sioattach       cyattach
 126 #define sioclose        cyclose
 127 #define siodriver       cydriver
 128 #define siodtrwakeup    cydtrwakeup
 129 #define sioinput        cyinput
 130 #define siointr         cyintr
 131 #define siointr1        cyintr1
 132 #define sioioctl        cyioctl
 133 #define sioopen         cyopen
 134 #define siopoll         cypoll
 135 #define sioprobe        cyprobe
 136 #define siosettimeout   cysettimeout
 137 #define siosetwater     cysetwater
 138 #define comstop         cystop
 139 #define siowrite        cywrite
 140 #define sio_registered  cy_registered
 141 #define sio_timeout     cy_timeout
 142 #define sio_timeout_handle cy_timeout_handle
 143 #define sio_timeouts_until_log  cy_timeouts_until_log
 144 #define sio_tty         cy_tty
 145
 146 #define CY_MAX_PORTS            (CD1400_NO_OF_CHANNELS * CY_MAX_CD1400s)
 147
 148 /* We encode the cyclom unit number (cyu) in spare bits in the IVR's. */
 149 #define CD1400_xIVR_CHAN_SHIFT  3
 150 #define CD1400_xIVR_CHAN        0x1F
 151
 152 /*
 153  * ETC states.  com->etc may also contain a hardware ETC command value,
 154  * meaning that execution of that command is pending.
 155  */
 156 #define ETC_NONE                0       /* we depend on bzero() setting this */
 157 #define ETC_BREAK_STARTING      1
 158 #define ETC_BREAK_STARTED       2
 159 #define ETC_BREAK_ENDING        3
 160 #define ETC_BREAK_ENDED         4
 161
 162 #define LOTS_OF_EVENTS  64      /* helps separate urgent events from input */
 163
 164 #define CALLOUT_MASK            0x80
 165 #define CONTROL_MASK            0x60
 166 #define CONTROL_INIT_STATE      0x20
 167 #define CONTROL_LOCK_STATE      0x40
 168 #define DEV_TO_UNIT(dev)        (MINOR_TO_UNIT(minor(dev)))
 169 #define MINOR_MAGIC_MASK        (CALLOUT_MASK | CONTROL_MASK)
 170 /*
 171  * Not all of the magic is parametrized in the following macros.  16 and
 172  * 0xff are related to the bitfields in a udev_t.  CY_MAX_PORTS must be
 173  * ((0xff & ~MINOR_MAGIC_MASK) + 1) for things to work.
 174  */
 175 #define MINOR_TO_UNIT(mynor)    (((mynor) >> 16) * CY_MAX_PORTS \
 176                                  | (((mynor) & 0xff) & ~MINOR_MAGIC_MASK))
 177 #define UNIT_TO_MINOR(unit)     (((unit) / CY_MAX_PORTS) << 16 \
 178                                  | (((unit) & 0xff) & ~MINOR_MAGIC_MASK))
 179
 180 /*
 181  * com state bits.
 182  * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
 183  * than the other bits so that they can be tested as a group without masking
 184  * off the low bits.
 185  *
 186  * The following com and tty flags correspond closely:
 187  *      CS_BUSY         = TS_BUSY (maintained by comstart(), siopoll() and
 188  *                                 comstop())
 189  *      CS_TTGO         = ~TS_TTSTOP (maintained by comparam() and comstart())
 190  *      CS_CTS_OFLOW    = CCTS_OFLOW (maintained by comparam())
 191  *      CS_RTS_IFLOW    = CRTS_IFLOW (maintained by comparam())
 192  * TS_FLUSH is not used.
 193  * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
 194  * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
 195  */
 196 #define CS_BUSY         0x80    /* output in progress */
 197 #define CS_TTGO         0x40    /* output not stopped by XOFF */
 198 #define CS_ODEVREADY    0x20    /* external device h/w ready (CTS) */
 199 #define CS_CHECKMSR     1       /* check of MSR scheduled */
 200 #define CS_CTS_OFLOW    2       /* use CTS output flow control */
 201 #define CS_DTR_OFF      0x10    /* DTR held off */
 202 #define CS_ODONE        4       /* output completed */
 203 #define CS_RTS_IFLOW    8       /* use RTS input flow control */
 204 #define CSE_ODONE       1       /* output transmitted */
 205
 206 static  char const * const      error_desc[] = {
 207 #define CE_OVERRUN                      0
 208         "silo overflow",
 209 #define CE_INTERRUPT_BUF_OVERFLOW       1
 210         "interrupt-level buffer overflow",
 211 #define CE_TTY_BUF_OVERFLOW             2
 212         "tty-level buffer overflow",
 213 };
 214
 215 #define CE_NTYPES                       3
 216 #define CE_RECORD(com, errnum)          (++(com)->delta_error_counts[errnum])
 217
 218 /* types.  XXX - should be elsewhere */
 219 typedef u_char  bool_t;         /* boolean */
 220 typedef u_char volatile *cy_addr;
 221
 222 /* queue of linear buffers */
 223 struct lbq {
 224         u_char  *l_head;        /* next char to process */
 225         u_char  *l_tail;        /* one past the last char to process */
 226         struct lbq *l_next;     /* next in queue */
 227         bool_t  l_queued;       /* nonzero if queued */
 228 };
 229
 230 /* com device structure */
 231 struct com_s {
 232         u_char  state;          /* miscellaneous flag bits */
 233         bool_t  active_out;     /* nonzero if the callout device is open */
 234 #if 0
 235         u_char  cfcr_image;     /* copy of value written to CFCR */
 236 #endif
 237         u_char  etc;            /* pending Embedded Transmit Command */
 238         u_char  extra_state;    /* more flag bits, separate for order trick */
 239 #if 0
 240         u_char  fifo_image;     /* copy of value written to FIFO */
 241 #endif
 242         u_char  gfrcr_image;    /* copy of value read from GFRCR */
 243 #if 0
 244         bool_t  hasfifo;        /* nonzero for 16550 UARTs */
 245         bool_t  loses_outints;  /* nonzero if device loses output interrupts */
 246 #endif
 247         u_char  mcr_dtr;        /* MCR bit that is wired to DTR */
 248         u_char  mcr_image;      /* copy of value written to MCR */
 249         u_char  mcr_rts;        /* MCR bit that is wired to RTS */
 250 #if 0
 251 #ifdef COM_MULTIPORT
 252         bool_t  multiport;      /* is this unit part of a multiport device? */
 253 #endif /* COM_MULTIPORT */
 254         bool_t  no_irq;         /* nonzero if irq is not attached */
 255         bool_t  poll;           /* nonzero if polling is required */
 256         bool_t  poll_output;    /* nonzero if polling for output is required */
 257 #endif
 258         int     unit;           /* unit number */
 259         int     dtr_wait;       /* time to hold DTR down on close (* 1/hz) */
 260 #if 0
 261         u_int   tx_fifo_size;
 262 #endif
 263         u_int   wopeners;       /* # processes waiting for DCD in open() */
 264
 265         /*
 266          * The high level of the driver never reads status registers directly
 267          * because there would be too many side effects to handle conveniently.
 268          * Instead, it reads copies of the registers stored here by the
 269          * interrupt handler.
 270          */
 271         u_char  last_modem_status;      /* last MSR read by intr handler */
 272         u_char  prev_modem_status;      /* last MSR handled by high level */
 273
 274         u_char  hotchar;        /* ldisc-specific char to be handled ASAP */
 275         u_char  *ibuf;          /* start of input buffer */
 276         u_char  *ibufend;       /* end of input buffer */
 277         u_char  *ibufold;       /* old input buffer, to be freed */
 278         u_char  *ihighwater;    /* threshold in input buffer */
 279         u_char  *iptr;          /* next free spot in input buffer */
 280         int     ibufsize;       /* size of ibuf (not include error bytes) */
 281         int     ierroff;        /* offset of error bytes in ibuf */
 282
 283         struct lbq      obufq;  /* head of queue of output buffers */
 284         struct lbq      obufs[2];       /* output buffers */
 285
 286         int     cy_align;       /* index for register alignment */
 287         cy_addr cy_iobase;      /* base address of this port's cyclom */
 288         cy_addr iobase;         /* base address of this port's cd1400 */
 289         int     mcr_rts_reg;    /* cd1400 reg number of reg holding mcr_rts */
 290
 291         struct tty      *tp;    /* cross reference */
 292
 293         /* Initial state. */
 294         struct termios  it_in;  /* should be in struct tty */
 295         struct termios  it_out;
 296
 297         /* Lock state. */
 298         struct termios  lt_in;  /* should be in struct tty */
 299         struct termios  lt_out;
 300
 301         bool_t  do_timestamp;
 302         bool_t  do_dcd_timestamp;
 303         struct timeval  timestamp;
 304         struct timeval  dcd_timestamp;
 305
 306         u_long  bytes_in;       /* statistics */
 307         u_long  bytes_out;
 308         u_int   delta_error_counts[CE_NTYPES];
 309         u_long  error_counts[CE_NTYPES];
 310
 311         u_int   recv_exception; /* exception chars received */
 312         u_int   mdm;            /* modem signal changes */
 313 #ifdef CyDebug
 314         u_int   start_count;    /* no. of calls to comstart() */
 315         u_int   start_real;     /* no. of calls that did something */
 316 #endif
 317         u_char  car;            /* CD1400 CAR shadow (if first unit in cd) */
 318         u_char  channel_control;/* CD1400 CCR control command shadow */
 319         u_char  cor[3];         /* CD1400 COR1-3 shadows */
 320         u_char  intr_enable;    /* CD1400 SRER shadow */
 321
 322         /*
 323          * Data area for output buffers.  Someday we should build the output
 324          * buffer queue without copying data.
 325          */
 326         u_char  obuf1[256];
 327         u_char  obuf2[256];
 328 };
 329
 330 /* PCI driver entry point. */
 331 int     cyattach_common         __P((cy_addr cy_iobase, int cy_align));
 332 ointhand2_t     siointr;
 333
 334 static  int     cy_units        __P((cy_addr cy_iobase, int cy_align));
 335 static  int     sioattach       __P((struct isa_device *dev));
 336 static  void    cd1400_channel_cmd __P((struct com_s *com, int cmd));
 337 static  void    cd1400_channel_cmd_wait __P((struct com_s *com));
 338 static  void    cd_etc          __P((struct com_s *com, int etc));
 339 static  int     cd_getreg       __P((struct com_s *com, int reg));
 340 static  void    cd_setreg       __P((struct com_s *com, int reg, int val));
 341 static  timeout_t siodtrwakeup;
 342 static  void    comhardclose    __P((struct com_s *com));
 343 static  void    sioinput        __P((struct com_s *com));
 344 #if 0
 345 static  void    siointr1        __P((struct com_s *com));
 346 #endif
 347 static  int     commctl         __P((struct com_s *com, int bits, int how));
 348 static  int     comparam        __P((struct tty *tp, struct termios *t));
 349 static  swihand_t siopoll;
 350 static  int     sioprobe        __P((struct isa_device *dev));
 351 static  void    siosettimeout   __P((void));
 352 static  int     siosetwater     __P((struct com_s *com, speed_t speed));
 353 static  int     comspeed        __P((speed_t speed, u_long cy_clock,
 354                                      int *prescaler_io));
 355 static  void    comstart        __P((struct tty *tp));
 356 static  void    comstop         __P((struct tty *tp, int rw));
 357 static  timeout_t comwakeup;
 358 static  void    disc_optim      __P((struct tty *tp, struct termios *t,
 359                                      struct com_s *com));
 360
 361 #ifdef CyDebug
 362 void    cystatus        __P((int unit));
 363 #endif
 364
 365 static char driver_name[] = "cy";
 366
 367 /* table and macro for fast conversion from a unit number to its com struct */
 368 static  struct com_s    *p_com_addr[NSIO];
 369 #define com_addr(unit)  (p_com_addr[unit])
 370
 371 struct isa_driver       siodriver = {
 372         sioprobe, sioattach, driver_name
 373 };
 374
 375 static  d_open_t        sioopen;
 376 static  d_close_t       sioclose;
 377 static  d_write_t       siowrite;
 378 static  d_ioctl_t       sioioctl;
 379
 380 #define CDEV_MAJOR      48
 381 static struct cdevsw sio_cdevsw = {
 382         /* open */      sioopen,
 383         /* close */     sioclose,
 384         /* read */      ttyread,
 385         /* write */     siowrite,
 386         /* ioctl */     sioioctl,
 387         /* poll */      ttypoll,
 388         /* mmap */      nommap,
 389         /* strategy */  nostrategy,
 390         /* name */      driver_name,
 391         /* maj */       CDEV_MAJOR,
 392         /* dump */      nodump,
 393         /* psize */     nopsize,
 394         /* flags */     D_TTY | D_KQFILTER,
 395         /* bmaj */      -1,
 396         /* kqfilter */  ttykqfilter,
 397 };
 398
 399 static  int     comconsole = -1;
 400 static  speed_t comdefaultrate = TTYDEF_SPEED;
 401 static  u_int   com_events;     /* input chars + weighted output completions */
 402 static  bool_t  sio_registered;
 403 static  int     sio_timeout;
 404 static  int     sio_timeouts_until_log;
 405 static  struct  callout_handle sio_timeout_handle
 406     = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle);
 407 #if 0 /* XXX */
 408 static struct tty       *sio_tty[NSIO];
 409 #else
 410 static struct tty       sio_tty[NSIO];
 411 #endif
 412 static  const int       nsio_tty = NSIO;
 413
 414 #ifdef CyDebug
 415 static  u_int   cd_inbs;
 416 static  u_int   cy_inbs;
 417 static  u_int   cd_outbs;
 418 static  u_int   cy_outbs;
 419 static  u_int   cy_svrr_probes;
 420 static  u_int   cy_timeouts;
 421 #endif
 422
 423 static  int     cy_chip_offset[] = {
 424         0x0000, 0x0400, 0x0800, 0x0c00, 0x0200, 0x0600, 0x0a00, 0x0e00,
 425 };
 426 static  int     cy_nr_cd1400s[NCY];
 427 static  int     cy_total_devices;
 428 #undef  RxFifoThreshold
 429 static  int     volatile RxFifoThreshold = (CD1400_RX_FIFO_SIZE / 2);
 430
 431 static int
 432 sioprobe(dev)
 433         struct isa_device       *dev;
 434 {
 435         cy_addr iobase;
 436
 437         iobase = (cy_addr)dev->id_maddr;
 438
 439         /* Cyclom-16Y hardware reset (Cyclom-8Ys don't care) */
 440         cy_inb(iobase, CY16_RESET, 0);  /* XXX? */
 441         DELAY(500);     /* wait for the board to get its act together */
 442
 443         /* this is needed to get the board out of reset */
 444         cy_outb(iobase, CY_CLEAR_INTR, 0, 0);
 445         DELAY(500);
 446
 447         return (cy_units(iobase, 0) == 0 ? 0 : -1);
 448 }
 449
 450 static int
 451 cy_units(cy_iobase, cy_align)
 452         cy_addr cy_iobase;
 453         int     cy_align;
 454 {
 455         int     cyu;
 456         u_char  firmware_version;
 457         int     i;
 458         cy_addr iobase;
 459
 460         for (cyu = 0; cyu < CY_MAX_CD1400s; ++cyu) {
 461                 iobase = cy_iobase + (cy_chip_offset[cyu] << cy_align);
 462
 463                 /* wait for chip to become ready for new command */
 464                 for (i = 0; i < 10; i++) {
 465                         DELAY(50);
 466                         if (!cd_inb(iobase, CD1400_CCR, cy_align))
 467                                 break;
 468                 }
 469
 470                 /* clear the GFRCR register */
 471                 cd_outb(iobase, CD1400_GFRCR, cy_align, 0);
 472
 473                 /* issue a reset command */
 474                 cd_outb(iobase, CD1400_CCR, cy_align,
 475                         CD1400_CCR_CMDRESET | CD1400_CCR_FULLRESET);
 476
 477                 /* wait for the CD1400 to initialize itself */
 478                 for (i = 0; i < 200; i++) {
 479                         DELAY(50);
 480
 481                         /* retrieve firmware version */
 482                         firmware_version = cd_inb(iobase, CD1400_GFRCR,
 483                                                   cy_align);
 484                         if ((firmware_version & 0xf0) == 0x40)
 485                                 break;
 486                 }
 487
 488                 /*
 489                  * Anything in the 0x40-0x4F range is fine.
 490                  * If one CD1400 is bad then we don't support higher
 491                  * numbered good ones on this board.
 492                  */
 493                 if ((firmware_version & 0xf0) != 0x40)
 494                         break;
 495         }
 496         return (cyu);
 497 }
 498
 499 static int
 500 sioattach(isdp)
 501         struct isa_device       *isdp;
 502 {
 503         int     adapter;
 504
 505         adapter = cyattach_common((cy_addr) isdp->id_maddr, 0);
 506         if (adapter < 0)
 507                 return (0);
 508
 509         /*
 510          * XXX
 511          * This kludge is to allow ISA/PCI device specifications in the
 512          * kernel config file to be in any order.
 513          */
 514         if (isdp->id_unit != adapter) {
 515                 printf("cy%d: attached as cy%d\n", isdp->id_unit, adapter);
 516                 isdp->id_unit = adapter;        /* XXX */
 517         }
 518         isdp->id_ointr = siointr;
 519         /* isdp->id_ri_flags |= RI_FAST; XXX unimplemented - use newbus! */
 520         return (1);
 521 }
 522
 523 int
 524 cyattach_common(cy_iobase, cy_align)
 525         cy_addr cy_iobase;
 526         int     cy_align;
 527 {
 528         int     adapter;
 529         int     cyu;
 530         u_char  firmware_version;
 531         cy_addr iobase;
 532         int     minorbase;
 533         int     ncyu;
 534         int     unit;
 535
 536         adapter = cy_total_devices;
 537         if ((u_int)adapter >= NCY) {
 538                 printf(
 539         "cy%d: can't attach adapter: insufficient cy devices configured\n",
 540                        adapter);
 541                 return (-1);
 542         }
 543         ncyu = cy_units(cy_iobase, cy_align);
 544         if (ncyu == 0)
 545                 return (-1);
 546         cy_nr_cd1400s[adapter] = ncyu;
 547         cy_total_devices++;
 548
 549         unit = adapter * CY_MAX_PORTS;
 550         for (cyu = 0; cyu < ncyu; ++cyu) {
 551                 int     cdu;
 552
 553                 iobase = (cy_addr) (cy_iobase
 554                                     + (cy_chip_offset[cyu] << cy_align));
 555                 firmware_version = cd_inb(iobase, CD1400_GFRCR, cy_align);
 556
 557                 /* Set up a receive timeout period of than 1+ ms. */
 558                 cd_outb(iobase, CD1400_PPR, cy_align,
 559                         howmany(CY_CLOCK(firmware_version)
 560                                 / CD1400_PPR_PRESCALER, 1000));
 561
 562                 for (cdu = 0; cdu < CD1400_NO_OF_CHANNELS; ++cdu, ++unit) {
 563                         struct com_s    *com;
 564                         int             s;
 565
 566         com = malloc(sizeof *com, M_DEVBUF, M_NOWAIT);
 567         if (com == NULL)
 568                 break;
 569         bzero(com, sizeof *com);
 570         com->unit = unit;
 571                         com->gfrcr_image = firmware_version;
 572                         if (CY_RTS_DTR_SWAPPED(firmware_version)) {
 573                                 com->mcr_dtr = MCR_RTS;
 574                                 com->mcr_rts = MCR_DTR;
 575                                 com->mcr_rts_reg = CD1400_MSVR2;
 576                         } else {
 577                                 com->mcr_dtr = MCR_DTR;
 578                                 com->mcr_rts = MCR_RTS;
 579                                 com->mcr_rts_reg = CD1400_MSVR1;
 580                         }
 581         com->dtr_wait = 3 * hz;
 582         com->obufs[0].l_head = com->obuf1;
 583         com->obufs[1].l_head = com->obuf2;
 584
 585                         com->cy_align = cy_align;
 586                         com->cy_iobase = cy_iobase;
 587         com->iobase = iobase;
 588                         com->car = ~CD1400_CAR_CHAN;
 589
 590         /*
 591          * We don't use all the flags from <sys/ttydefaults.h> since they
 592          * are only relevant for logins.  It's important to have echo off
 593          * initially so that the line doesn't start blathering before the
 594          * echo flag can be turned off.
 595          */
 596         com->it_in.c_iflag = 0;
 597         com->it_in.c_oflag = 0;
 598         com->it_in.c_cflag = TTYDEF_CFLAG;
 599         com->it_in.c_lflag = 0;
 600         if (unit == comconsole) {
 601                 com->it_in.c_iflag = TTYDEF_IFLAG;
 602                 com->it_in.c_oflag = TTYDEF_OFLAG;
 603                 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
 604                 com->it_in.c_lflag = TTYDEF_LFLAG;
 605                 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL;
 606         }
 607         if (siosetwater(com, com->it_in.c_ispeed) != 0) {
 608                 enable_intr();
 609                 free(com, M_DEVBUF);
 610                 return (0);
 611         }
 612         enable_intr();
 613         termioschars(&com->it_in);
 614         com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
 615         com->it_out = com->it_in;
 616
 617         s = spltty();
 618         com_addr(unit) = com;
 619         splx(s);
 620
 621         if (!sio_registered) {
 622                 cdevsw_add(&sio_cdevsw);
 623                 register_swi(SWI_TTY, siopoll);
 624                 sio_registered = TRUE;
 625         }
 626         minorbase = UNIT_TO_MINOR(unit);
 627         make_dev(&sio_cdevsw, minorbase,
 628                 UID_ROOT, GID_WHEEL, 0600, "ttyc%r%r", adapter,
 629                 unit % CY_MAX_PORTS);
 630         make_dev(&sio_cdevsw, minorbase | CONTROL_INIT_STATE,
 631                 UID_ROOT, GID_WHEEL, 0600, "ttyic%r%r", adapter,
 632                 unit % CY_MAX_PORTS);
 633         make_dev(&sio_cdevsw, minorbase | CONTROL_LOCK_STATE,
 634                 UID_ROOT, GID_WHEEL, 0600, "ttylc%r%r", adapter,
 635                 unit % CY_MAX_PORTS);
 636         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK,
 637                 UID_UUCP, GID_DIALER, 0660, "cuac%r%r", adapter,
 638                 unit % CY_MAX_PORTS);
 639         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_INIT_STATE,
 640                 UID_UUCP, GID_DIALER, 0660, "cuaic%r%r", adapter,
 641                 unit % CY_MAX_PORTS);
 642         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE,
 643                 UID_UUCP, GID_DIALER, 0660, "cualc%r%r", adapter,
 644                 unit % CY_MAX_PORTS);
 645                 }
 646         }
 647
 648         /* ensure an edge for the next interrupt */
 649         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
 650
 651         return (adapter);
 652 }
 653
 654 static int
 655 sioopen(dev_t dev; int flag; int mode; struct thread *td)
 656 {
 657         struct com_s    *com;
 658         int             error;
 659         int             mynor;
 660         int             s;
 661         struct tty      *tp;
 662         int             unit;
 663
 664         mynor = minor(dev);
 665         unit = MINOR_TO_UNIT(mynor);
 666         if ((u_int) unit >= NSIO || (com = com_addr(unit)) == NULL)
 667                 return (ENXIO);
 668         if (mynor & CONTROL_MASK)
 669                 return (0);
 670 #if 0 /* XXX */
 671         tp = com->tp = sio_tty[unit] = ttymalloc(sio_tty[unit]);
 672 #else
 673         tp = com->tp = &sio_tty[unit];
 674 #endif
 675         dev->si_tty = tp;
 676         s = spltty();
 677         /*
 678          * We jump to this label after all non-interrupted sleeps to pick
 679          * up any changes of the device state.
 680          */
 681 open_top:
 682         while (com->state & CS_DTR_OFF) {
 683                 error = tsleep(&com->dtr_wait, PCATCH, "cydtr", 0);
 684                 if (error != 0)
 685                         goto out;
 686         }
 687         if (tp->t_state & TS_ISOPEN) {
 688                 /*
 689                  * The device is open, so everything has been initialized.
 690                  * Handle conflicts.
 691                  */
 692                 if (mynor & CALLOUT_MASK) {
 693                         if (!com->active_out) {
 694                                 error = EBUSY;
 695                                 goto out;
 696                         }
 697                 } else {
 698                         if (com->active_out) {
 699                                 if (flag & O_NONBLOCK) {
 700                                         error = EBUSY;
 701                                         goto out;
 702                                 }
 703                                 error = tsleep(&com->active_out,
 704                                                PCATCH, "cybi", 0);
 705                                 if (error != 0)
 706                                         goto out;
 707                                 goto open_top;
 708                         }
 709                 }
 710                 if (tp->t_state & TS_XCLUDE &&
 711                     suser(td)) {
 712                         error = EBUSY;
 713                         goto out;
 714                 }
 715         } else {
 716                 /*
 717                  * The device isn't open, so there are no conflicts.
 718                  * Initialize it.  Initialization is done twice in many
 719                  * cases: to preempt sleeping callin opens if we are
 720                  * callout, and to complete a callin open after DCD rises.
 721                  */
 722                 tp->t_oproc = comstart;
 723                 tp->t_stop = comstop;
 724                 tp->t_param = comparam;
 725                 tp->t_dev = dev;
 726                 tp->t_termios = mynor & CALLOUT_MASK
 727                                 ? com->it_out : com->it_in;
 728
 729                 /* Encode per-board unit in LIVR for access in intr routines. */
 730                 cd_setreg(com, CD1400_LIVR,
 731                           (unit & CD1400_xIVR_CHAN) << CD1400_xIVR_CHAN_SHIFT);
 732
 733                 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET);
 734 #if 0
 735                 com->poll = com->no_irq;
 736                 com->poll_output = com->loses_outints;
 737 #endif
 738                 ++com->wopeners;
 739                 error = comparam(tp, &tp->t_termios);
 740                 --com->wopeners;
 741                 if (error != 0)
 742                         goto out;
 743 #if 0
 744                 if (com->hasfifo) {
 745                         /*
 746                          * (Re)enable and flush fifos.
 747                          *
 748                          * Certain SMC chips cause problems if the fifos
 749                          * are enabled while input is ready.  Turn off the
 750                          * fifo if necessary to clear the input.  We test
 751                          * the input ready bit after enabling the fifos
 752                          * since we've already enabled them in comparam()
 753                          * and to handle races between enabling and fresh
 754                          * input.
 755                          */
 756                         while (TRUE) {
 757                                 outb(iobase + com_fifo,
 758                                      FIFO_RCV_RST | FIFO_XMT_RST
 759                                      | com->fifo_image);
 760                                 DELAY(100);
 761                                 if (!(inb(com->line_status_port) & LSR_RXRDY))
 762                                         break;
 763                                 outb(iobase + com_fifo, 0);
 764                                 DELAY(100);
 765                                 (void) inb(com->data_port);
 766                         }
 767                 }
 768
 769                 disable_intr();
 770                 (void) inb(com->line_status_port);
 771                 (void) inb(com->data_port);
 772                 com->prev_modem_status = com->last_modem_status
 773                     = inb(com->modem_status_port);
 774                 outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS
 775                                        | IER_EMSC);
 776                 enable_intr();
 777 #else /* !0 */
 778                 /*
 779                  * Flush fifos.  This requires a full channel reset which
 780                  * also disables the transmitter and receiver.  Recover
 781                  * from this.
 782                  */
 783                 cd1400_channel_cmd(com,
 784                                    CD1400_CCR_CMDRESET | CD1400_CCR_CHANRESET);
 785                 cd1400_channel_cmd(com, com->channel_control);
 786
 787                 disable_intr();
 788                 com->prev_modem_status = com->last_modem_status
 789                     = cd_getreg(com, CD1400_MSVR2);
 790                 cd_setreg(com, CD1400_SRER,
 791                           com->intr_enable
 792                           = CD1400_SRER_MDMCH | CD1400_SRER_RXDATA);
 793                 enable_intr();
 794 #endif /* 0 */
 795                 /*
 796                  * Handle initial DCD.  Callout devices get a fake initial
 797                  * DCD (trapdoor DCD).  If we are callout, then any sleeping
 798                  * callin opens get woken up and resume sleeping on "cybi"
 799                  * instead of "cydcd".
 800                  */
 801                 /*
 802                  * XXX `mynor & CALLOUT_MASK' should be
 803                  * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
 804                  * TRAPDOOR_CARRIER is the default initial state for callout
 805                  * devices and SOFT_CARRIER is like CLOCAL except it hides
 806                  * the true carrier.
 807                  */
 808                 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK)
 809                         (*linesw[tp->t_line].l_modem)(tp, 1);
 810         }
 811         /*
 812          * Wait for DCD if necessary.
 813          */
 814         if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK)
 815             && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) {
 816                 ++com->wopeners;
 817                 error = tsleep(TSA_CARR_ON(tp), PCATCH, "cydcd", 0);
 818                 --com->wopeners;
 819                 if (error != 0)
 820                         goto out;
 821                 goto open_top;
 822         }
 823         error = (*linesw[tp->t_line].l_open)(dev, tp);
 824         disc_optim(tp, &tp->t_termios, com);
 825         if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
 826                 com->active_out = TRUE;
 827         siosettimeout();
 828 out:
 829         splx(s);
 830         if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
 831                 comhardclose(com);
 832         return (error);
 833 }
 834
 835 static int
 836 sioclose(dev_t dev, int flag, int mode, struct thread *td)
 837 {
 838         struct com_s    *com;
 839         int             mynor;
 840         int             s;
 841         struct tty      *tp;
 842
 843         mynor = minor(dev);
 844         if (mynor & CONTROL_MASK)
 845                 return (0);
 846         com = com_addr(MINOR_TO_UNIT(mynor));
 847         tp = com->tp;
 848         s = spltty();
 849         cd_etc(com, CD1400_ETC_STOPBREAK);
 850         (*linesw[tp->t_line].l_close)(tp, flag);
 851         disc_optim(tp, &tp->t_termios, com);
 852         comstop(tp, FREAD | FWRITE);
 853         comhardclose(com);
 854         ttyclose(tp);
 855         siosettimeout();
 856         splx(s);
 857 #ifdef broken /* session holds a ref to the tty; can't deallocate */
 858         ttyfree(tp);
 859         com->tp = sio_tty[unit] = NULL;
 860 #endif
 861         return (0);
 862 }
 863
 864 static void
 865 comhardclose(com)
 866         struct com_s    *com;
 867 {
 868         cy_addr         iobase;
 869         int             s;
 870         struct tty      *tp;
 871         int             unit;
 872
 873         unit = com->unit;
 874         iobase = com->iobase;
 875         s = spltty();
 876 #if 0
 877         com->poll = FALSE;
 878         com->poll_output = FALSE;
 879 #endif
 880         com->do_timestamp = 0;
 881 #if 0
 882         outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
 883 #else
 884         /* XXX */
 885         disable_intr();
 886         com->etc = ETC_NONE;
 887         cd_setreg(com, CD1400_COR2, com->cor[1] &= ~CD1400_COR2_ETC);
 888         enable_intr();
 889         cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
 890 #endif
 891
 892         {
 893 #if 0
 894                 outb(iobase + com_ier, 0);
 895 #else
 896                 disable_intr();
 897                 cd_setreg(com, CD1400_SRER, com->intr_enable = 0);
 898                 enable_intr();
 899 #endif
 900                 tp = com->tp;
 901                 if ((tp->t_cflag & HUPCL)
 902                     /*
 903                      * XXX we will miss any carrier drop between here and the
 904                      * next open.  Perhaps we should watch DCD even when the
 905                      * port is closed; it is not sufficient to check it at
 906                      * the next open because it might go up and down while
 907                      * we're not watching.
 908                      */
 909                     || (!com->active_out
 910                        && !(com->prev_modem_status & MSR_DCD)
 911                        && !(com->it_in.c_cflag & CLOCAL))
 912                     || !(tp->t_state & TS_ISOPEN)) {
 913                         (void)commctl(com, TIOCM_DTR, DMBIC);
 914
 915                         /* Disable receiver (leave transmitter enabled). */
 916                         com->channel_control = CD1400_CCR_CMDCHANCTL
 917                                                | CD1400_CCR_XMTEN
 918                                                | CD1400_CCR_RCVDIS;
 919                         cd1400_channel_cmd(com, com->channel_control);
 920
 921                         if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) {
 922                                 timeout(siodtrwakeup, com, com->dtr_wait);
 923                                 com->state |= CS_DTR_OFF;
 924                         }
 925                 }
 926         }
 927 #if 0
 928         if (com->hasfifo) {
 929                 /*
 930                  * Disable fifos so that they are off after controlled
 931                  * reboots.  Some BIOSes fail to detect 16550s when the
 932                  * fifos are enabled.
 933                  */
 934                 outb(iobase + com_fifo, 0);
 935         }
 936 #endif
 937         com->active_out = FALSE;
 938         wakeup(&com->active_out);
 939         wakeup(TSA_CARR_ON(tp));        /* restart any wopeners */
 940         splx(s);
 941 }
 942
 943 static int
 944 siowrite(dev, uio, flag)
 945         dev_t           dev;
 946         struct uio      *uio;
 947         int             flag;
 948 {
 949         int             mynor;
 950         struct tty      *tp;
 951         int             unit;
 952
 953         mynor = minor(dev);
 954         if (mynor & CONTROL_MASK)
 955                 return (ENODEV);
 956
 957         unit = MINOR_TO_UNIT(mynor);
 958         tp = com_addr(unit)->tp;
 959         /*
 960          * (XXX) We disallow virtual consoles if the physical console is
 961          * a serial port.  This is in case there is a display attached that
 962          * is not the console.  In that situation we don't need/want the X
 963          * server taking over the console.
 964          */
 965         if (constty != NULL && unit == comconsole)
 966                 constty = NULL;
 967 #ifdef Smarts
 968         /* XXX duplicate ttwrite(), but without so much output processing on
 969          * CR & LF chars.  Hardly worth the effort, given that high-throughput
 970          * sessions are raw anyhow.
 971          */
 972 #else
 973         return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
 974 #endif
 975 }
 976
 977 static void
 978 siodtrwakeup(chan)
 979         void    *chan;
 980 {
 981         struct com_s    *com;
 982
 983         com = (struct com_s *)chan;
 984         com->state &= ~CS_DTR_OFF;
 985         wakeup(&com->dtr_wait);
 986 }
 987
 988 static void
 989 sioinput(com)
 990         struct com_s    *com;
 991 {
 992         u_char          *buf;
 993         int             incc;
 994         u_char          line_status;
 995         int             recv_data;
 996         struct tty      *tp;
 997
 998         buf = com->ibuf;
 999         tp = com->tp;
1000         if (!(tp->t_state & TS_ISOPEN)) {
1001                 com_events -= (com->iptr - com->ibuf);
1002                 com->iptr = com->ibuf;
1003                 return;
1004         }
1005         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1006                 /*
1007                  * Avoid the grotesquely inefficient lineswitch routine
1008                  * (ttyinput) in "raw" mode.  It usually takes about 450
1009                  * instructions (that's without canonical processing or echo!).
1010                  * slinput is reasonably fast (usually 40 instructions plus
1011                  * call overhead).
1012                  */
1013                 do {
1014                         enable_intr();
1015                         incc = com->iptr - buf;
1016                         if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
1017                             && (com->state & CS_RTS_IFLOW
1018                                 || tp->t_iflag & IXOFF)
1019                             && !(tp->t_state & TS_TBLOCK))
1020                                 ttyblock(tp);
1021                         com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
1022                                 += b_to_q((char *)buf, incc, &tp->t_rawq);
1023                         buf += incc;
1024                         tk_nin += incc;
1025                         tk_rawcc += incc;
1026                         tp->t_rawcc += incc;
1027                         ttwakeup(tp);
1028                         if (tp->t_state & TS_TTSTOP
1029                             && (tp->t_iflag & IXANY
1030                                 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1031                                 tp->t_state &= ~TS_TTSTOP;
1032                                 tp->t_lflag &= ~FLUSHO;
1033                                 comstart(tp);
1034                         }
1035                         disable_intr();
1036                 } while (buf < com->iptr);
1037         } else {
1038                 do {
1039                         enable_intr();
1040                         line_status = buf[com->ierroff];
1041                         recv_data = *buf++;
1042                         if (line_status
1043                             & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
1044                                 if (line_status & LSR_BI)
1045                                         recv_data |= TTY_BI;
1046                                 if (line_status & LSR_FE)
1047                                         recv_data |= TTY_FE;
1048                                 if (line_status & LSR_OE)
1049                                         recv_data |= TTY_OE;
1050                                 if (line_status & LSR_PE)
1051                                         recv_data |= TTY_PE;
1052                         }
1053                         (*linesw[tp->t_line].l_rint)(recv_data, tp);
1054                         disable_intr();
1055                 } while (buf < com->iptr);
1056         }
1057         com_events -= (com->iptr - com->ibuf);
1058         com->iptr = com->ibuf;
1059
1060         /*
1061          * There is now room for another low-level buffer full of input,
1062          * so enable RTS if it is now disabled and there is room in the
1063          * high-level buffer.
1064          */
1065         if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & com->mcr_rts) &&
1066             !(tp->t_state & TS_TBLOCK))
1067 #if 0
1068                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1069 #else
1070                 cd_setreg(com, com->mcr_rts_reg,
1071                           com->mcr_image |= com->mcr_rts);
1072 #endif
1073 }
1074
1075 void
1076 siointr(unit)
1077         int     unit;
1078 {
1079         int     baseu;
1080         int     cy_align;
1081         cy_addr cy_iobase;
1082         int     cyu;
1083         cy_addr iobase;
1084         u_char  status;
1085
1086         COM_LOCK();     /* XXX could this be placed down lower in the loop? */
1087
1088         baseu = unit * CY_MAX_PORTS;
1089         cy_align = com_addr(baseu)->cy_align;
1090         cy_iobase = com_addr(baseu)->cy_iobase;
1091
1092         /* check each CD1400 in turn */
1093         for (cyu = 0; cyu < cy_nr_cd1400s[unit]; ++cyu) {
1094                 iobase = (cy_addr) (cy_iobase
1095                                     + (cy_chip_offset[cyu] << cy_align));
1096                 /* poll to see if it has any work */
1097                 status = cd_inb(iobase, CD1400_SVRR, cy_align);
1098                 if (status == 0)
1099                         continue;
1100 #ifdef CyDebug
1101                 ++cy_svrr_probes;
1102 #endif
1103                 /* service requests as appropriate, giving priority to RX */
1104                 if (status & CD1400_SVRR_RXRDY) {
1105                         struct com_s    *com;
1106                         u_int           count;
1107                         u_char          *ioptr;
1108                         u_char          line_status;
1109                         u_char          recv_data;
1110                         u_char          serv_type;
1111 #ifdef PollMode
1112                         u_char          save_rir;
1113 #endif
1114
1115 #ifdef PollMode
1116                         save_rir = cd_inb(iobase, CD1400_RIR, cy_align);
1117
1118                         /* enter rx service */
1119                         cd_outb(iobase, CD1400_CAR, cy_align, save_rir);
1120                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
1121                         = save_rir & CD1400_CAR_CHAN;
1122
1123                         serv_type = cd_inb(iobase, CD1400_RIVR, cy_align);
1124                         com = com_addr(baseu
1125                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
1126                                           & CD1400_xIVR_CHAN));
1127 #else
1128                         /* ack receive service */
1129                         serv_type = cy_inb(iobase, CY8_SVCACKR, cy_align);
1130
1131                         com = com_addr(baseu +
1132                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
1133                                           & CD1400_xIVR_CHAN));
1134 #endif
1135
1136                 if (serv_type & CD1400_RIVR_EXCEPTION) {
1137                         ++com->recv_exception;
1138                         line_status = cd_inb(iobase, CD1400_RDSR, cy_align);
1139                         /* break/unnattached error bits or real input? */
1140                         recv_data = cd_inb(iobase, CD1400_RDSR, cy_align);
1141 #ifndef SOFT_HOTCHAR
1142                         if (line_status & CD1400_RDSR_SPECIAL
1143                             && com->hotchar != 0)
1144                                 setsofttty();
1145 #endif
1146 #if 1 /* XXX "intelligent" PFO error handling would break O error handling */
1147                         if (line_status & (LSR_PE|LSR_FE|LSR_BI)) {
1148                                 /*
1149                                   Don't store PE if IGNPAR and BI if IGNBRK,
1150                                   this hack allows "raw" tty optimization
1151                                   works even if IGN* is set.
1152                                 */
1153                                 if (   com->tp == NULL
1154                                     || !(com->tp->t_state & TS_ISOPEN)
1155                                     || ((line_status & (LSR_PE|LSR_FE))
1156                                     &&  (com->tp->t_iflag & IGNPAR))
1157                                     || ((line_status & LSR_BI)
1158                                     &&  (com->tp->t_iflag & IGNBRK)))
1159                                         goto cont;
1160                                 if (   (line_status & (LSR_PE|LSR_FE))
1161                                     && (com->tp->t_state & TS_CAN_BYPASS_L_RINT)
1162                                     && ((line_status & LSR_FE)
1163                                     ||  ((line_status & LSR_PE)
1164                                     &&  (com->tp->t_iflag & INPCK))))
1165                                         recv_data = 0;
1166                         }
1167 #endif /* 1 */
1168                         ++com->bytes_in;
1169 #ifdef SOFT_HOTCHAR
1170                         if (com->hotchar != 0 && recv_data == com->hotchar)
1171                                 setsofttty();
1172 #endif
1173                         ioptr = com->iptr;
1174                         if (ioptr >= com->ibufend)
1175                                 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
1176                         else {
1177                                 if (com->do_timestamp)
1178                                         microtime(&com->timestamp);
1179                                 ++com_events;
1180                                 ioptr[0] = recv_data;
1181                                 ioptr[com->ierroff] = line_status;
1182                                 com->iptr = ++ioptr;
1183                                 if (ioptr == com->ihighwater
1184                                     && com->state & CS_RTS_IFLOW)
1185 #if 0
1186                                         outb(com->modem_ctl_port,
1187                                              com->mcr_image &= ~MCR_RTS);
1188 #else
1189                                         cd_outb(iobase, com->mcr_rts_reg,
1190                                                 cy_align,
1191                                                 com->mcr_image &=
1192                                                 ~com->mcr_rts);
1193 #endif
1194                                 if (line_status & LSR_OE)
1195                                         CE_RECORD(com, CE_OVERRUN);
1196                         }
1197                         goto cont;
1198                 } else {
1199                         int     ifree;
1200
1201                         count = cd_inb(iobase, CD1400_RDCR, cy_align);
1202                         if (!count)
1203                                 goto cont;
1204                         com->bytes_in += count;
1205                         ioptr = com->iptr;
1206                         ifree = com->ibufend - ioptr;
1207                         if (count > ifree) {
1208                                 count -= ifree;
1209                                 com_events += ifree;
1210                                 if (ifree != 0) {
1211                                         if (com->do_timestamp)
1212                                                 microtime(&com->timestamp);
1213                                         do {
1214                                                 recv_data = cd_inb(iobase,
1215                                                                    CD1400_RDSR,
1216                                                                    cy_align);
1217 #ifdef SOFT_HOTCHAR
1218                                                 if (com->hotchar != 0
1219                                                     && recv_data
1220                                                        == com->hotchar)
1221                                                         setsofttty();
1222 #endif
1223                                                 ioptr[0] = recv_data;
1224                                                 ioptr[com->ierroff] = 0;
1225                                                 ++ioptr;
1226                                         } while (--ifree != 0);
1227                                 }
1228                                 com->delta_error_counts
1229                                     [CE_INTERRUPT_BUF_OVERFLOW] += count;
1230                                 do {
1231                                         recv_data = cd_inb(iobase, CD1400_RDSR,
1232                                                            cy_align);
1233 #ifdef SOFT_HOTCHAR
1234                                         if (com->hotchar != 0
1235                                             && recv_data == com->hotchar)
1236                                                 setsofttty();
1237 #endif
1238                                 } while (--count != 0);
1239                         } else {
1240                                 if (com->do_timestamp)
1241                                         microtime(&com->timestamp);
1242                                 if (ioptr <= com->ihighwater
1243                                     && ioptr + count > com->ihighwater
1244                                     && com->state & CS_RTS_IFLOW)
1245 #if 0
1246                                         outb(com->modem_ctl_port,
1247                                              com->mcr_image &= ~MCR_RTS);
1248 #else
1249                                         cd_outb(iobase, com->mcr_rts_reg,
1250                                                 cy_align,
1251                                                 com->mcr_image
1252                                                 &= ~com->mcr_rts);
1253 #endif
1254                                 com_events += count;
1255                                 do {
1256                                         recv_data = cd_inb(iobase, CD1400_RDSR,
1257                                                            cy_align);
1258 #ifdef SOFT_HOTCHAR
1259                                         if (com->hotchar != 0
1260                                             && recv_data == com->hotchar)
1261                                                 setsofttty();
1262 #endif
1263                                         ioptr[0] = recv_data;
1264                                         ioptr[com->ierroff] = 0;
1265                                         ++ioptr;
1266                                 } while (--count != 0);
1267                         }
1268                         com->iptr = ioptr;
1269                 }
1270 cont:
1271
1272                         /* terminate service context */
1273 #ifdef PollMode
1274                         cd_outb(iobase, CD1400_RIR, cy_align,
1275                                 save_rir
1276                                 & ~(CD1400_RIR_RDIREQ | CD1400_RIR_RBUSY));
1277 #else
1278                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
1279 #endif
1280                 }
1281                 if (status & CD1400_SVRR_MDMCH) {
1282                         struct com_s    *com;
1283                         u_char  modem_status;
1284 #ifdef PollMode
1285                         u_char  save_mir;
1286 #else
1287                         u_char  vector;
1288 #endif
1289
1290 #ifdef PollMode
1291                         save_mir = cd_inb(iobase, CD1400_MIR, cy_align);
1292
1293                         /* enter modem service */
1294                         cd_outb(iobase, CD1400_CAR, cy_align, save_mir);
1295                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
1296                         = save_mir & CD1400_CAR_CHAN;
1297
1298                         com = com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS
1299                                        + (save_mir & CD1400_MIR_CHAN));
1300 #else
1301                         /* ack modem service */
1302                         vector = cy_inb(iobase, CY8_SVCACKM, cy_align);
1303
1304                         com = com_addr(baseu
1305                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
1306                                           & CD1400_xIVR_CHAN));
1307 #endif
1308                         ++com->mdm;
1309                         modem_status = cd_inb(iobase, CD1400_MSVR2, cy_align);
1310                 if (modem_status != com->last_modem_status) {
1311                         if (com->do_dcd_timestamp
1312                             && !(com->last_modem_status & MSR_DCD)
1313                             && modem_status & MSR_DCD)
1314                                 microtime(&com->dcd_timestamp);
1315
1316                         /*
1317                          * Schedule high level to handle DCD changes.  Note
1318                          * that we don't use the delta bits anywhere.  Some
1319                          * UARTs mess them up, and it's easy to remember the
1320                          * previous bits and calculate the delta.
1321                          */
1322                         com->last_modem_status = modem_status;
1323                         if (!(com->state & CS_CHECKMSR)) {
1324                                 com_events += LOTS_OF_EVENTS;
1325                                 com->state |= CS_CHECKMSR;
1326                                 setsofttty();
1327                         }
1328
1329 #ifdef SOFT_CTS_OFLOW
1330                         /* handle CTS change immediately for crisp flow ctl */
1331                         if (com->state & CS_CTS_OFLOW) {
1332                                 if (modem_status & MSR_CTS) {
1333                                         com->state |= CS_ODEVREADY;
1334                                         if (com->state >= (CS_BUSY | CS_TTGO
1335                                                            | CS_ODEVREADY)
1336                                             && !(com->intr_enable
1337                                                  & CD1400_SRER_TXRDY))
1338                                                 cd_outb(iobase, CD1400_SRER,
1339                                                         cy_align,
1340                                                         com->intr_enable
1341                                                         = com->intr_enable
1342                                                           & ~CD1400_SRER_TXMPTY
1343                                                           | CD1400_SRER_TXRDY);
1344                                 } else {
1345                                         com->state &= ~CS_ODEVREADY;
1346                                         if (com->intr_enable
1347                                             & CD1400_SRER_TXRDY)
1348                                                 cd_outb(iobase, CD1400_SRER,
1349                                                         cy_align,
1350                                                         com->intr_enable
1351                                                         = com->intr_enable
1352                                                           & ~CD1400_SRER_TXRDY
1353                                                           | CD1400_SRER_TXMPTY);
1354                                 }
1355                         }
1356 #endif
1357                 }
1358
1359                         /* terminate service context */
1360 #ifdef PollMode
1361                         cd_outb(iobase, CD1400_MIR, cy_align,
1362                                 save_mir
1363                                 & ~(CD1400_MIR_RDIREQ | CD1400_MIR_RBUSY));
1364 #else
1365                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
1366 #endif
1367                 }
1368                 if (status & CD1400_SVRR_TXRDY) {
1369                         struct com_s    *com;
1370 #ifdef PollMode
1371                         u_char  save_tir;
1372 #else
1373                         u_char  vector;
1374 #endif
1375
1376 #ifdef PollMode
1377                         save_tir = cd_inb(iobase, CD1400_TIR, cy_align);
1378
1379                         /* enter tx service */
1380                         cd_outb(iobase, CD1400_CAR, cy_align, save_tir);
1381                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
1382                         = save_tir & CD1400_CAR_CHAN;
1383
1384                         com = com_addr(baseu
1385                                        + cyu * CD1400_NO_OF_CHANNELS
1386                                        + (save_tir & CD1400_TIR_CHAN));
1387 #else
1388                         /* ack transmit service */
1389                         vector = cy_inb(iobase, CY8_SVCACKT, cy_align);
1390
1391                         com = com_addr(baseu
1392                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
1393                                           & CD1400_xIVR_CHAN));
1394 #endif
1395
1396                         if (com->etc != ETC_NONE) {
1397                                 if (com->intr_enable & CD1400_SRER_TXRDY) {
1398                                         /*
1399                                          * Here due to sloppy SRER_TXRDY
1400                                          * enabling.  Ignore.  Come back when
1401                                          * tx is empty.
1402                                          */
1403                                         cd_outb(iobase, CD1400_SRER, cy_align,
1404                                                 com->intr_enable
1405                                                 = (com->intr_enable
1406                                                   & ~CD1400_SRER_TXRDY)
1407                                                   | CD1400_SRER_TXMPTY);
1408                                         goto terminate_tx_service;
1409                                 }
1410                                 switch (com->etc) {
1411                                 case CD1400_ETC_SENDBREAK:
1412                                 case CD1400_ETC_STOPBREAK:
1413                                         /*
1414                                          * Start the command.  Come back on
1415                                          * next tx empty interrupt, hopefully
1416                                          * after command has been executed.
1417                                          */
1418                                         cd_outb(iobase, CD1400_COR2, cy_align,
1419                                                 com->cor[1] |= CD1400_COR2_ETC);
1420                                         cd_outb(iobase, CD1400_TDR, cy_align,
1421                                                 CD1400_ETC_CMD);
1422                                         cd_outb(iobase, CD1400_TDR, cy_align,
1423                                                 com->etc);
1424                                         if (com->etc == CD1400_ETC_SENDBREAK)
1425                                                 com->etc = ETC_BREAK_STARTING;
1426                                         else
1427                                                 com->etc = ETC_BREAK_ENDING;
1428                                         goto terminate_tx_service;
1429                                 case ETC_BREAK_STARTING:
1430                                         /*
1431                                          * BREAK is now on.  Continue with
1432                                          * SRER_TXMPTY processing, hopefully
1433                                          * don't come back.
1434                                          */
1435                                         com->etc = ETC_BREAK_STARTED;
1436                                         break;
1437                                 case ETC_BREAK_STARTED:
1438                                         /*
1439                                          * Came back due to sloppy SRER_TXMPTY
1440                                          * enabling.  Hope again.
1441                                          */
1442                                         break;
1443                                 case ETC_BREAK_ENDING:
1444                                         /*
1445                                          * BREAK is now off.  Continue with
1446                                          * SRER_TXMPTY processing and don't
1447                                          * come back.  The SWI handler will
1448                                          * restart tx interrupts if necessary.
1449                                          */
1450                                         cd_outb(iobase, CD1400_COR2, cy_align,
1451                                                 com->cor[1]
1452                                                 &= ~CD1400_COR2_ETC);
1453                                         com->etc = ETC_BREAK_ENDED;
1454                                         if (!(com->state & CS_ODONE)) {
1455                                                 com_events += LOTS_OF_EVENTS;
1456                                                 com->state |= CS_ODONE;
1457                                                 setsofttty();
1458                                         }
1459                                         break;
1460                                 case ETC_BREAK_ENDED:
1461                                         /*
1462                                          * Shouldn't get here.  Hope again.
1463                                          */
1464                                         break;
1465                                 }
1466                         }
1467                         if (com->intr_enable & CD1400_SRER_TXMPTY) {
1468                                 if (!(com->extra_state & CSE_ODONE)) {
1469                                         com_events += LOTS_OF_EVENTS;
1470                                         com->extra_state |= CSE_ODONE;
1471                                         setsofttty();
1472                                 }
1473                                 cd_outb(iobase, CD1400_SRER, cy_align,
1474                                         com->intr_enable
1475                                         &= ~CD1400_SRER_TXMPTY);
1476                                 goto terminate_tx_service;
1477                         }
1478                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
1479                         u_char  *ioptr;
1480                         u_int   ocount;
1481
1482                         ioptr = com->obufq.l_head;
1483                                 ocount = com->obufq.l_tail - ioptr;
1484                                 if (ocount > CD1400_TX_FIFO_SIZE)
1485                                         ocount = CD1400_TX_FIFO_SIZE;
1486                                 com->bytes_out += ocount;
1487                                 do
1488                                         cd_outb(iobase, CD1400_TDR, cy_align,
1489                                                 *ioptr++);
1490                                 while (--ocount != 0);
1491                         com->obufq.l_head = ioptr;
1492                         if (ioptr >= com->obufq.l_tail) {
1493                                 struct lbq      *qp;
1494
1495                                 qp = com->obufq.l_next;
1496                                 qp->l_queued = FALSE;
1497                                 qp = qp->l_next;
1498                                 if (qp != NULL) {
1499                                         com->obufq.l_head = qp->l_head;
1500                                         com->obufq.l_tail = qp->l_tail;
1501                                         com->obufq.l_next = qp;
1502                                 } else {
1503                                         /* output just completed */
1504                                         com->state &= ~CS_BUSY;
1505
1506                                         /*
1507                                          * The setting of CSE_ODONE may be
1508                                          * stale here.  We currently only
1509                                          * use it when CS_BUSY is set, and
1510                                          * fixing it when we clear CS_BUSY
1511                                          * is easiest.
1512                                          */
1513                                         if (com->extra_state & CSE_ODONE) {
1514                                                 com_events -= LOTS_OF_EVENTS;
1515                                                 com->extra_state &= ~CSE_ODONE;
1516                                         }
1517
1518                                         cd_outb(iobase, CD1400_SRER, cy_align,
1519                                                 com->intr_enable
1520                                                 = (com->intr_enable
1521                                                   & ~CD1400_SRER_TXRDY)
1522                                                   | CD1400_SRER_TXMPTY);
1523                                 }
1524                                 if (!(com->state & CS_ODONE)) {
1525                                         com_events += LOTS_OF_EVENTS;
1526                                         com->state |= CS_ODONE;
1527
1528                                         /* handle at high level ASAP */
1529                                         setsofttty();
1530                                 }
1531                         }
1532                 }
1533
1534                         /* terminate service context */
1535 terminate_tx_service:
1536 #ifdef PollMode
1537                         cd_outb(iobase, CD1400_TIR, cy_align,
1538                                 save_tir
1539                                 & ~(CD1400_TIR_RDIREQ | CD1400_TIR_RBUSY));
1540 #else
1541                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
1542 #endif
1543                 }
1544         }
1545
1546         /* ensure an edge for the next interrupt */
1547         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
1548
1549         schedsofttty();
1550
1551         COM_UNLOCK();
1552 }
1553
1554 #if 0
1555 static void
1556 siointr1(com)
1557         struct com_s    *com;
1558 {
1559 }
1560 #endif
1561
1562 static int
1563 sioioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
1564 {
1565         struct com_s    *com;
1566         int             error;
1567         int             mynor;
1568         int             s;
1569         struct tty      *tp;
1570 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1571         int             oldcmd;
1572         struct termios  term;
1573 #endif
1574
1575         mynor = minor(dev);
1576         com = com_addr(MINOR_TO_UNIT(mynor));
1577         if (mynor & CONTROL_MASK) {
1578                 struct termios  *ct;
1579
1580                 switch (mynor & CONTROL_MASK) {
1581                 case CONTROL_INIT_STATE:
1582                         ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in;
1583                         break;
1584                 case CONTROL_LOCK_STATE:
1585                         ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in;
1586                         break;
1587                 default:
1588                         return (ENODEV);        /* /dev/nodev */
1589                 }
1590                 switch (cmd) {
1591                 case TIOCSETA:
1592                         error = suser(td);
1593                         if (error != 0)
1594                                 return (error);
1595                         *ct = *(struct termios *)data;
1596                         return (0);
1597                 case TIOCGETA:
1598                         *(struct termios *)data = *ct;
1599                         return (0);
1600                 case TIOCGETD:
1601                         *(int *)data = TTYDISC;
1602                         return (0);
1603                 case TIOCGWINSZ:
1604                         bzero(data, sizeof(struct winsize));
1605                         return (0);
1606                 default:
1607                         return (ENOTTY);
1608                 }
1609         }
1610         tp = com->tp;
1611 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1612         term = tp->t_termios;
1613         oldcmd = cmd;
1614         error = ttsetcompat(tp, &cmd, data, &term);
1615         if (error != 0)
1616                 return (error);
1617         if (cmd != oldcmd)
1618                 data = (caddr_t)&term;
1619 #endif
1620         if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
1621                 int     cc;
1622                 struct termios *dt = (struct termios *)data;
1623                 struct termios *lt = mynor & CALLOUT_MASK
1624                                      ? &com->lt_out : &com->lt_in;
1625
1626                 dt->c_iflag = (tp->t_iflag & lt->c_iflag)
1627                               | (dt->c_iflag & ~lt->c_iflag);
1628                 dt->c_oflag = (tp->t_oflag & lt->c_oflag)
1629                               | (dt->c_oflag & ~lt->c_oflag);
1630                 dt->c_cflag = (tp->t_cflag & lt->c_cflag)
1631                               | (dt->c_cflag & ~lt->c_cflag);
1632                 dt->c_lflag = (tp->t_lflag & lt->c_lflag)
1633                               | (dt->c_lflag & ~lt->c_lflag);
1634                 for (cc = 0; cc < NCCS; ++cc)
1635                         if (lt->c_cc[cc] != 0)
1636                                 dt->c_cc[cc] = tp->t_cc[cc];
1637                 if (lt->c_ispeed != 0)
1638                         dt->c_ispeed = tp->t_ispeed;
1639                 if (lt->c_ospeed != 0)
1640                         dt->c_ospeed = tp->t_ospeed;
1641         }
1642         error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
1643         if (error != ENOIOCTL)
1644                 return (error);
1645         s = spltty();
1646         error = ttioctl(tp, cmd, data, flag);
1647         disc_optim(tp, &tp->t_termios, com);
1648         if (error != ENOIOCTL) {
1649                 splx(s);
1650                 return (error);
1651         }
1652         switch (cmd) {
1653         case TIOCSBRK:
1654 #if 0
1655                 outb(iobase + com_cfcr, com->cfcr_image |= CFCR_SBREAK);
1656 #else
1657                 cd_etc(com, CD1400_ETC_SENDBREAK);
1658 #endif
1659                 break;
1660         case TIOCCBRK:
1661 #if 0
1662                 outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1663 #else
1664                 cd_etc(com, CD1400_ETC_STOPBREAK);
1665 #endif
1666                 break;
1667         case TIOCSDTR:
1668                 (void)commctl(com, TIOCM_DTR, DMBIS);
1669                 break;
1670         case TIOCCDTR:
1671                 (void)commctl(com, TIOCM_DTR, DMBIC);
1672                 break;
1673         /*
1674          * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set.  The
1675          * changes get undone on the next call to comparam().
1676          */
1677         case TIOCMSET:
1678                 (void)commctl(com, *(int *)data, DMSET);
1679                 break;
1680         case TIOCMBIS:
1681                 (void)commctl(com, *(int *)data, DMBIS);
1682                 break;
1683         case TIOCMBIC:
1684                 (void)commctl(com, *(int *)data, DMBIC);
1685                 break;
1686         case TIOCMGET:
1687                 *(int *)data = commctl(com, 0, DMGET);
1688                 break;
1689         case TIOCMSDTRWAIT:
1690                 /* must be root since the wait applies to following logins */
1691                 error = suser(td);
1692                 if (error != 0) {
1693                         splx(s);
1694                         return (error);
1695                 }
1696                 com->dtr_wait = *(int *)data * hz / 100;
1697                 break;
1698         case TIOCMGDTRWAIT:
1699                 *(int *)data = com->dtr_wait * 100 / hz;
1700                 break;
1701         case TIOCTIMESTAMP:
1702                 com->do_timestamp = TRUE;
1703                 *(struct timeval *)data = com->timestamp;
1704                 break;
1705         case TIOCDCDTIMESTAMP:
1706                 com->do_dcd_timestamp = TRUE;
1707                 *(struct timeval *)data = com->dcd_timestamp;
1708                 break;
1709         default:
1710                 splx(s);
1711                 return (ENOTTY);
1712         }
1713         splx(s);
1714         return (0);
1715 }
1716
1717 static void
1718 siopoll()
1719 {
1720         int             unit;
1721
1722 #ifdef CyDebug
1723         ++cy_timeouts;
1724 #endif
1725         if (com_events == 0)
1726                 return;
1727 repeat:
1728         for (unit = 0; unit < NSIO; ++unit) {
1729                 struct com_s    *com;
1730                 int             incc;
1731                 struct tty      *tp;
1732
1733                 com = com_addr(unit);
1734                 if (com == NULL)
1735                         continue;
1736                 tp = com->tp;
1737                 if (tp == NULL) {
1738                         /*
1739                          * XXX forget any events related to closed devices
1740                          * (actually never opened devices) so that we don't
1741                          * loop.
1742                          */
1743                         disable_intr();
1744                         incc = com->iptr - com->ibuf;
1745                         com->iptr = com->ibuf;
1746                         if (com->state & CS_CHECKMSR) {
1747                                 incc += LOTS_OF_EVENTS;
1748                                 com->state &= ~CS_CHECKMSR;
1749                         }
1750                         com_events -= incc;
1751                         enable_intr();
1752                         if (incc != 0)
1753                                 log(LOG_DEBUG,
1754                                     "sio%d: %d events for device with no tp\n",
1755                                     unit, incc);
1756                         continue;
1757                 }
1758                 if (com->iptr != com->ibuf) {
1759                         disable_intr();
1760                         sioinput(com);
1761                         enable_intr();
1762                 }
1763                 if (com->state & CS_CHECKMSR) {
1764                         u_char  delta_modem_status;
1765
1766                         disable_intr();
1767                         delta_modem_status = com->last_modem_status
1768                                              ^ com->prev_modem_status;
1769                         com->prev_modem_status = com->last_modem_status;
1770                         com_events -= LOTS_OF_EVENTS;
1771                         com->state &= ~CS_CHECKMSR;
1772                         enable_intr();
1773                         if (delta_modem_status & MSR_DCD)
1774                                 (*linesw[tp->t_line].l_modem)
1775                                         (tp, com->prev_modem_status & MSR_DCD);
1776                 }
1777                 if (com->extra_state & CSE_ODONE) {
1778                         disable_intr();
1779                         com_events -= LOTS_OF_EVENTS;
1780                         com->extra_state &= ~CSE_ODONE;
1781                         enable_intr();
1782                         if (!(com->state & CS_BUSY)) {
1783                                 tp->t_state &= ~TS_BUSY;
1784                                 ttwwakeup(com->tp);
1785                         }
1786                         if (com->etc != ETC_NONE) {
1787                                 if (com->etc == ETC_BREAK_ENDED)
1788                                         com->etc = ETC_NONE;
1789                                 wakeup(&com->etc);
1790                         }
1791                 }
1792                 if (com->state & CS_ODONE) {
1793                         disable_intr();
1794                         com_events -= LOTS_OF_EVENTS;
1795                         com->state &= ~CS_ODONE;
1796                         enable_intr();
1797                         (*linesw[tp->t_line].l_start)(tp);
1798                 }
1799                 if (com_events == 0)
1800                         break;
1801         }
1802         if (com_events >= LOTS_OF_EVENTS)
1803                 goto repeat;
1804 }
1805
1806 static int
1807 comparam(tp, t)
1808         struct tty      *tp;
1809         struct termios  *t;
1810 {
1811         int             bits;
1812         int             cflag;
1813         struct com_s    *com;
1814         u_char          cor_change;
1815         u_long          cy_clock;
1816         int             idivisor;
1817         int             iflag;
1818         int             iprescaler;
1819         int             itimeout;
1820         int             odivisor;
1821         int             oprescaler;
1822         u_char          opt;
1823         int             s;
1824         int             unit;
1825
1826         /* do historical conversions */
1827         if (t->c_ispeed == 0)
1828                 t->c_ispeed = t->c_ospeed;
1829
1830         unit = DEV_TO_UNIT(tp->t_dev);
1831         com = com_addr(unit);
1832
1833         /* check requested parameters */
1834         cy_clock = CY_CLOCK(com->gfrcr_image);
1835         idivisor = comspeed(t->c_ispeed, cy_clock, &iprescaler);
1836         if (idivisor < 0)
1837                 return (EINVAL);
1838         odivisor = comspeed(t->c_ospeed, cy_clock, &oprescaler);
1839         if (odivisor < 0)
1840                 return (EINVAL);
1841
1842         /* parameters are OK, convert them to the com struct and the device */
1843         s = spltty();
1844         if (odivisor == 0)
1845                 (void)commctl(com, TIOCM_DTR, DMBIC);   /* hang up line */
1846         else
1847                 (void)commctl(com, TIOCM_DTR, DMBIS);
1848
1849         /*
1850          * This returns with interrupts disabled so that we can complete
1851          * the speed change atomically.
1852          */
1853         (void) siosetwater(com, t->c_ispeed);
1854
1855         /* XXX we don't actually change the speed atomically. */
1856         enable_intr();
1857
1858         if (idivisor != 0) {
1859                 cd_setreg(com, CD1400_RBPR, idivisor);
1860                 cd_setreg(com, CD1400_RCOR, iprescaler);
1861         }
1862         if (odivisor != 0) {
1863                 cd_setreg(com, CD1400_TBPR, odivisor);
1864                 cd_setreg(com, CD1400_TCOR, oprescaler);
1865         }
1866
1867         /*
1868          * channel control
1869          *      receiver enable
1870          *      transmitter enable (always set)
1871          */
1872         cflag = t->c_cflag;
1873         opt = CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTEN
1874               | (cflag & CREAD ? CD1400_CCR_RCVEN : CD1400_CCR_RCVDIS);
1875         if (opt != com->channel_control) {
1876                 com->channel_control = opt;
1877                 cd1400_channel_cmd(com, opt);
1878         }
1879
1880 #ifdef Smarts
1881         /* set special chars */
1882         /* XXX if one is _POSIX_VDISABLE, can't use some others */
1883         if (t->c_cc[VSTOP] != _POSIX_VDISABLE)
1884                 cd_setreg(com, CD1400_SCHR1, t->c_cc[VSTOP]);
1885         if (t->c_cc[VSTART] != _POSIX_VDISABLE)
1886                 cd_setreg(com, CD1400_SCHR2, t->c_cc[VSTART]);
1887         if (t->c_cc[VINTR] != _POSIX_VDISABLE)
1888                 cd_setreg(com, CD1400_SCHR3, t->c_cc[VINTR]);
1889         if (t->c_cc[VSUSP] != _POSIX_VDISABLE)
1890                 cd_setreg(com, CD1400_SCHR4, t->c_cc[VSUSP]);
1891 #endif
1892
1893         /*
1894          * set channel option register 1 -
1895          *      parity mode
1896          *      stop bits
1897          *      char length
1898          */
1899         opt = 0;
1900         /* parity */
1901         if (cflag & PARENB) {
1902                 if (cflag & PARODD)
1903                         opt |= CD1400_COR1_PARODD;
1904                 opt |= CD1400_COR1_PARNORMAL;
1905         }
1906         iflag = t->c_iflag;
1907         if (!(iflag & INPCK))
1908                 opt |= CD1400_COR1_NOINPCK;
1909         bits = 1 + 1;
1910         /* stop bits */
1911         if (cflag & CSTOPB) {
1912                 ++bits;
1913                 opt |= CD1400_COR1_STOP2;
1914         }
1915         /* char length */
1916         switch (cflag & CSIZE) {
1917         case CS5:
1918                 bits += 5;
1919                 opt |= CD1400_COR1_CS5;
1920                 break;
1921         case CS6:
1922                 bits += 6;
1923                 opt |= CD1400_COR1_CS6;
1924                 break;
1925         case CS7:
1926                 bits += 7;
1927                 opt |= CD1400_COR1_CS7;
1928                 break;
1929         default:
1930                 bits += 8;
1931                 opt |= CD1400_COR1_CS8;
1932                 break;
1933         }
1934         cor_change = 0;
1935         if (opt != com->cor[0]) {
1936                 cor_change |= CD1400_CCR_COR1;
1937                 cd_setreg(com, CD1400_COR1, com->cor[0] = opt);
1938         }
1939
1940         /*
1941          * Set receive time-out period, normally to max(one char time, 5 ms).
1942          */
1943         if (t->c_ispeed == 0)
1944                 itimeout = cd_getreg(com, CD1400_RTPR);
1945         else {
1946                 itimeout = (1000 * bits + t->c_ispeed - 1) / t->c_ispeed;
1947 #ifdef SOFT_HOTCHAR
1948 #define MIN_RTP         1
1949 #else
1950 #define MIN_RTP         5
1951 #endif
1952                 if (itimeout < MIN_RTP)
1953                         itimeout = MIN_RTP;
1954         }
1955         if (!(t->c_lflag & ICANON) && t->c_cc[VMIN] != 0 && t->c_cc[VTIME] != 0
1956             && t->c_cc[VTIME] * 10 > itimeout)
1957                 itimeout = t->c_cc[VTIME] * 10;
1958         if (itimeout > 255)
1959                 itimeout = 255;
1960         cd_setreg(com, CD1400_RTPR, itimeout);
1961
1962         /*
1963          * set channel option register 2 -
1964          *      flow control
1965          */
1966         opt = 0;
1967 #ifdef Smarts
1968         if (iflag & IXANY)
1969                 opt |= CD1400_COR2_IXANY;
1970         if (iflag & IXOFF)
1971                 opt |= CD1400_COR2_IXOFF;
1972 #endif
1973 #ifndef SOFT_CTS_OFLOW
1974         if (cflag & CCTS_OFLOW)
1975                 opt |= CD1400_COR2_CCTS_OFLOW;
1976 #endif
1977         disable_intr();
1978         if (opt != com->cor[1]) {
1979                 cor_change |= CD1400_CCR_COR2;
1980                 cd_setreg(com, CD1400_COR2, com->cor[1] = opt);
1981         }
1982         enable_intr();
1983
1984         /*
1985          * set channel option register 3 -
1986          *      receiver FIFO interrupt threshold
1987          *      flow control
1988          */
1989         opt = RxFifoThreshold;
1990 #ifdef Smarts
1991         if (t->c_lflag & ICANON)
1992                 opt |= CD1400_COR3_SCD34;       /* detect INTR & SUSP chars */
1993         if (iflag & IXOFF)
1994                 /* detect and transparently handle START and STOP chars */
1995                 opt |= CD1400_COR3_FCT | CD1400_COR3_SCD12;
1996 #endif
1997         if (opt != com->cor[2]) {
1998                 cor_change |= CD1400_CCR_COR3;
1999                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
2000         }
2001
2002         /* notify the CD1400 if COR1-3 have changed */
2003         if (cor_change)
2004                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | cor_change);
2005
2006         /*
2007          * set channel option register 4 -
2008          *      CR/NL processing
2009          *      break processing
2010          *      received exception processing
2011          */
2012         opt = 0;
2013         if (iflag & IGNCR)
2014                 opt |= CD1400_COR4_IGNCR;
2015 #ifdef Smarts
2016         /*
2017          * we need a new ttyinput() for this, as we don't want to
2018          * have ICRNL && INLCR being done in both layers, or to have
2019          * synchronisation problems
2020          */
2021         if (iflag & ICRNL)
2022                 opt |= CD1400_COR4_ICRNL;
2023         if (iflag & INLCR)
2024                 opt |= CD1400_COR4_INLCR;
2025 #endif
2026         if (iflag & IGNBRK)
2027                 opt |= CD1400_COR4_IGNBRK | CD1400_COR4_NOBRKINT;
2028         /*
2029          * The `-ignbrk -brkint parmrk' case is not handled by the hardware,
2030          * so only tell the hardware about -brkint if -parmrk.
2031          */
2032         if (!(iflag & (BRKINT | PARMRK)))
2033                 opt |= CD1400_COR4_NOBRKINT;
2034 #if 0
2035         /* XXX using this "intelligence" breaks reporting of overruns. */
2036         if (iflag & IGNPAR)
2037                 opt |= CD1400_COR4_PFO_DISCARD;
2038         else {
2039                 if (iflag & PARMRK)
2040                         opt |= CD1400_COR4_PFO_ESC;
2041                 else
2042                         opt |= CD1400_COR4_PFO_NUL;
2043         }
2044 #else
2045         opt |= CD1400_COR4_PFO_EXCEPTION;
2046 #endif
2047         cd_setreg(com, CD1400_COR4, opt);
2048
2049         /*
2050          * set channel option register 5 -
2051          */
2052         opt = 0;
2053         if (iflag & ISTRIP)
2054                 opt |= CD1400_COR5_ISTRIP;
2055         if (t->c_iflag & IEXTEN)
2056                 /* enable LNEXT (e.g. ctrl-v quoting) handling */
2057                 opt |= CD1400_COR5_LNEXT;
2058 #ifdef Smarts
2059         if (t->c_oflag & ONLCR)
2060                 opt |= CD1400_COR5_ONLCR;
2061         if (t->c_oflag & OCRNL)
2062                 opt |= CD1400_COR5_OCRNL;
2063 #endif
2064         cd_setreg(com, CD1400_COR5, opt);
2065
2066         /*
2067          * We always generate modem status change interrupts for CD changes.
2068          * Among other things, this is necessary to track TS_CARR_ON for
2069          * pstat to print even when the driver doesn't care.  CD changes
2070          * should be rare so interrupts for them are not worth extra code to
2071          * avoid.  We avoid interrupts for other modem status changes (except
2072          * for CTS changes when SOFT_CTS_OFLOW is configured) since this is
2073          * simplest and best.
2074          */
2075
2076         /*
2077          * set modem change option register 1
2078          *      generate modem interrupts on which 1 -> 0 input transitions
2079          *      also controls auto-DTR output flow-control, which we don't use
2080          */
2081         opt = CD1400_MCOR1_CDzd;
2082 #ifdef SOFT_CTS_OFLOW
2083         if (cflag & CCTS_OFLOW)
2084                 opt |= CD1400_MCOR1_CTSzd;
2085 #endif
2086         cd_setreg(com, CD1400_MCOR1, opt);
2087
2088         /*
2089          * set modem change option register 2
2090          *      generate modem interrupts on specific 0 -> 1 input transitions
2091          */
2092         opt = CD1400_MCOR2_CDod;
2093 #ifdef SOFT_CTS_OFLOW
2094         if (cflag & CCTS_OFLOW)
2095                 opt |= CD1400_MCOR2_CTSod;
2096 #endif
2097         cd_setreg(com, CD1400_MCOR2, opt);
2098
2099         /*
2100          * XXX should have done this long ago, but there is too much state
2101          * to change all atomically.
2102          */
2103         disable_intr();
2104
2105         com->state &= ~CS_TTGO;
2106         if (!(tp->t_state & TS_TTSTOP))
2107                 com->state |= CS_TTGO;
2108         if (cflag & CRTS_IFLOW) {
2109                 com->state |= CS_RTS_IFLOW;
2110                 /*
2111                  * If CS_RTS_IFLOW just changed from off to on, the change
2112                  * needs to be propagated to MCR_RTS.  This isn't urgent,
2113                  * so do it later by calling comstart() instead of repeating
2114                  * a lot of code from comstart() here.
2115                  */
2116         } else if (com->state & CS_RTS_IFLOW) {
2117                 com->state &= ~CS_RTS_IFLOW;
2118                 /*
2119                  * CS_RTS_IFLOW just changed from on to off.  Force MCR_RTS
2120                  * on here, since comstart() won't do it later.
2121                  */
2122 #if 0
2123                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2124 #else
2125                 cd_setreg(com, com->mcr_rts_reg,
2126                           com->mcr_image |= com->mcr_rts);
2127 #endif
2128         }
2129
2130         /*
2131          * Set up state to handle output flow control.
2132          * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
2133          * Now has 10+ msec latency, while CTS flow has 50- usec latency.
2134          */
2135         com->state |= CS_ODEVREADY;
2136 #ifdef SOFT_CTS_OFLOW
2137         com->state &= ~CS_CTS_OFLOW;
2138         if (cflag & CCTS_OFLOW) {
2139                 com->state |= CS_CTS_OFLOW;
2140                 if (!(com->last_modem_status & MSR_CTS))
2141                         com->state &= ~CS_ODEVREADY;
2142         }
2143 #endif
2144         /* XXX shouldn't call functions while intrs are disabled. */
2145         disc_optim(tp, t, com);
2146 #if 0
2147         /*
2148          * Recover from fiddling with CS_TTGO.  We used to call siointr1()
2149          * unconditionally, but that defeated the careful discarding of
2150          * stale input in sioopen().
2151          */
2152         if (com->state >= (CS_BUSY | CS_TTGO))
2153                 siointr1(com);
2154 #endif
2155         if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
2156                 if (!(com->intr_enable & CD1400_SRER_TXRDY))
2157                         cd_setreg(com, CD1400_SRER,
2158                                   com->intr_enable
2159                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
2160                                     | CD1400_SRER_TXRDY);
2161         } else {
2162                 if (com->intr_enable & CD1400_SRER_TXRDY)
2163                         cd_setreg(com, CD1400_SRER,
2164                                   com->intr_enable
2165                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
2166                                     | CD1400_SRER_TXMPTY);
2167         }
2168
2169         enable_intr();
2170         splx(s);
2171         comstart(tp);
2172         if (com->ibufold != NULL) {
2173                 free(com->ibufold, M_DEVBUF);
2174                 com->ibufold = NULL;
2175         }
2176         return (0);
2177 }
2178
2179 static int
2180 siosetwater(com, speed)
2181         struct com_s    *com;
2182         speed_t         speed;
2183 {
2184         int             cp4ticks;
2185         u_char          *ibuf;
2186         int             ibufsize;
2187         struct tty      *tp;
2188
2189         /*
2190          * Make the buffer size large enough to handle a softtty interrupt
2191          * latency of about 2 ticks without loss of throughput or data
2192          * (about 3 ticks if input flow control is not used or not honoured,
2193          * but a bit less for CS5-CS7 modes).
2194          */
2195         cp4ticks = speed / 10 / hz * 4;
2196         for (ibufsize = 128; ibufsize < cp4ticks;)
2197                 ibufsize <<= 1;
2198         if (ibufsize == com->ibufsize) {
2199                 disable_intr();
2200                 return (0);
2201         }
2202
2203         /*
2204          * Allocate input buffer.  The extra factor of 2 in the size is
2205          * to allow for an error byte for each input byte.
2206          */
2207         ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT);
2208         if (ibuf == NULL) {
2209                 disable_intr();
2210                 return (ENOMEM);
2211         }
2212
2213         /* Initialize non-critical variables. */
2214         com->ibufold = com->ibuf;
2215         com->ibufsize = ibufsize;
2216         tp = com->tp;
2217         if (tp != NULL) {
2218                 tp->t_ififosize = 2 * ibufsize;
2219                 tp->t_ispeedwat = (speed_t)-1;
2220                 tp->t_ospeedwat = (speed_t)-1;
2221         }
2222
2223         /*
2224          * Read current input buffer, if any.  Continue with interrupts
2225          * disabled.
2226          */
2227         disable_intr();
2228         if (com->iptr != com->ibuf)
2229                 sioinput(com);
2230
2231         /*-
2232          * Initialize critical variables, including input buffer watermarks.
2233          * The external device is asked to stop sending when the buffer
2234          * exactly reaches high water, or when the high level requests it.
2235          * The high level is notified immediately (rather than at a later
2236          * clock tick) when this watermark is reached.
2237          * The buffer size is chosen so the watermark should almost never
2238          * be reached.
2239          * The low watermark is invisibly 0 since the buffer is always
2240          * emptied all at once.
2241          */
2242         com->iptr = com->ibuf = ibuf;
2243         com->ibufend = ibuf + ibufsize;
2244         com->ierroff = ibufsize;
2245         com->ihighwater = ibuf + 3 * ibufsize / 4;
2246         return (0);
2247 }
2248
2249 static void
2250 comstart(tp)
2251         struct tty      *tp;
2252 {
2253         struct com_s    *com;
2254         int             s;
2255 #ifdef CyDebug
2256         bool_t          started;
2257 #endif
2258         int             unit;
2259
2260         unit = DEV_TO_UNIT(tp->t_dev);
2261         com = com_addr(unit);
2262         s = spltty();
2263
2264 #ifdef CyDebug
2265         ++com->start_count;
2266         started = FALSE;
2267 #endif
2268
2269         disable_intr();
2270         if (tp->t_state & TS_TTSTOP) {
2271                 com->state &= ~CS_TTGO;
2272                 if (com->intr_enable & CD1400_SRER_TXRDY)
2273                         cd_setreg(com, CD1400_SRER,
2274                                   com->intr_enable
2275                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
2276                                     | CD1400_SRER_TXMPTY);
2277         } else {
2278                 com->state |= CS_TTGO;
2279                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)
2280                     && !(com->intr_enable & CD1400_SRER_TXRDY))
2281                         cd_setreg(com, CD1400_SRER,
2282                                   com->intr_enable
2283                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
2284                                     | CD1400_SRER_TXRDY);
2285         }
2286         if (tp->t_state & TS_TBLOCK) {
2287                 if (com->mcr_image & com->mcr_rts && com->state & CS_RTS_IFLOW)
2288 #if 0
2289                         outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
2290 #else
2291                         cd_setreg(com, com->mcr_rts_reg,
2292                                   com->mcr_image &= ~com->mcr_rts);
2293 #endif
2294         } else {
2295                 if (!(com->mcr_image & com->mcr_rts)
2296                     && com->iptr < com->ihighwater
2297                     && com->state & CS_RTS_IFLOW)
2298 #if 0
2299                         outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2300 #else
2301                         cd_setreg(com, com->mcr_rts_reg,
2302                                   com->mcr_image |= com->mcr_rts);
2303 #endif
2304         }
2305         enable_intr();
2306         if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
2307                 ttwwakeup(tp);
2308                 splx(s);
2309                 return;
2310         }
2311         if (tp->t_outq.c_cc != 0) {
2312                 struct lbq      *qp;
2313                 struct lbq      *next;
2314
2315                 if (!com->obufs[0].l_queued) {
2316 #ifdef CyDebug
2317                         started = TRUE;
2318 #endif
2319                         com->obufs[0].l_tail
2320                             = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
2321                                                   sizeof com->obuf1);
2322                         com->obufs[0].l_next = NULL;
2323                         com->obufs[0].l_queued = TRUE;
2324                         disable_intr();
2325                         if (com->state & CS_BUSY) {
2326                                 qp = com->obufq.l_next;
2327                                 while ((next = qp->l_next) != NULL)
2328                                         qp = next;
2329                                 qp->l_next = &com->obufs[0];
2330                         } else {
2331                                 com->obufq.l_head = com->obufs[0].l_head;
2332                                 com->obufq.l_tail = com->obufs[0].l_tail;
2333                                 com->obufq.l_next = &com->obufs[0];
2334                                 com->state |= CS_BUSY;
2335                                 if (com->state >= (CS_BUSY | CS_TTGO
2336                                                    | CS_ODEVREADY))
2337                                         cd_setreg(com, CD1400_SRER,
2338                                                   com->intr_enable
2339                                                   = (com->intr_enable
2340                                                     & ~CD1400_SRER_TXMPTY)
2341                                                     | CD1400_SRER_TXRDY);
2342                         }
2343                         enable_intr();
2344                 }
2345                 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
2346 #ifdef CyDebug
2347                         started = TRUE;
2348 #endif
2349                         com->obufs[1].l_tail
2350                             = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
2351                                                   sizeof com->obuf2);
2352                         com->obufs[1].l_next = NULL;
2353                         com->obufs[1].l_queued = TRUE;
2354                         disable_intr();
2355                         if (com->state & CS_BUSY) {
2356                                 qp = com->obufq.l_next;
2357                                 while ((next = qp->l_next) != NULL)
2358                                         qp = next;
2359                                 qp->l_next = &com->obufs[1];
2360                         } else {
2361                                 com->obufq.l_head = com->obufs[1].l_head;
2362                                 com->obufq.l_tail = com->obufs[1].l_tail;
2363                                 com->obufq.l_next = &com->obufs[1];
2364                                 com->state |= CS_BUSY;
2365                                 if (com->state >= (CS_BUSY | CS_TTGO
2366                                                    | CS_ODEVREADY))
2367                                         cd_setreg(com, CD1400_SRER,
2368                                                   com->intr_enable
2369                                                   = (com->intr_enable
2370                                                     & ~CD1400_SRER_TXMPTY)
2371                                                     | CD1400_SRER_TXRDY);
2372                         }
2373                         enable_intr();
2374                 }
2375                 tp->t_state |= TS_BUSY;
2376         }
2377 #ifdef CyDebug
2378         if (started)
2379                 ++com->start_real;
2380 #endif
2381 #if 0
2382         disable_intr();
2383         if (com->state >= (CS_BUSY | CS_TTGO))
2384                 siointr1(com);  /* fake interrupt to start output */
2385         enable_intr();
2386 #endif
2387         ttwwakeup(tp);
2388         splx(s);
2389 }
2390
2391 static void
2392 comstop(tp, rw)
2393         struct tty      *tp;
2394         int             rw;
2395 {
2396         struct com_s    *com;
2397         bool_t          wakeup_etc;
2398
2399         com = com_addr(DEV_TO_UNIT(tp->t_dev));
2400         wakeup_etc = FALSE;
2401         disable_intr();
2402         if (rw & FWRITE) {
2403                 com->obufs[0].l_queued = FALSE;
2404                 com->obufs[1].l_queued = FALSE;
2405                 if (com->extra_state & CSE_ODONE) {
2406                         com_events -= LOTS_OF_EVENTS;
2407                         com->extra_state &= ~CSE_ODONE;
2408                         if (com->etc != ETC_NONE) {
2409                                 if (com->etc == ETC_BREAK_ENDED)
2410                                         com->etc = ETC_NONE;
2411                                 wakeup_etc = TRUE;
2412                         }
2413                 }
2414                 com->tp->t_state &= ~TS_BUSY;
2415                 if (com->state & CS_ODONE)
2416                         com_events -= LOTS_OF_EVENTS;
2417                 com->state &= ~(CS_ODONE | CS_BUSY);
2418         }
2419         if (rw & FREAD) {
2420                 /* XXX no way to reset only input fifo. */
2421                 com_events -= (com->iptr - com->ibuf);
2422                 com->iptr = com->ibuf;
2423         }
2424         enable_intr();
2425         if (wakeup_etc)
2426                 wakeup(&com->etc);
2427         if (rw & FWRITE && com->etc == ETC_NONE)
2428                 cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
2429         comstart(tp);
2430 }
2431
2432 static int
2433 commctl(com, bits, how)
2434         struct com_s    *com;
2435         int             bits;
2436         int             how;
2437 {
2438         int     mcr;
2439         int     msr;
2440
2441         if (how == DMGET) {
2442                 if (com->channel_control & CD1400_CCR_RCVEN)
2443                         bits |= TIOCM_LE;
2444                 mcr = com->mcr_image;
2445                 if (mcr & com->mcr_dtr)
2446                         bits |= TIOCM_DTR;
2447                 if (mcr & com->mcr_rts)
2448                         /* XXX wired on for Cyclom-8Ys */
2449                         bits |= TIOCM_RTS;
2450
2451                 /*
2452                  * We must read the modem status from the hardware because
2453                  * we don't generate modem status change interrupts for all
2454                  * changes, so com->prev_modem_status is not guaranteed to
2455                  * be up to date.  This is safe, unlike for sio, because
2456                  * reading the status register doesn't clear pending modem
2457                  * status change interrupts.
2458                  */
2459                 msr = cd_getreg(com, CD1400_MSVR2);
2460
2461                 if (msr & MSR_CTS)
2462                         bits |= TIOCM_CTS;
2463                 if (msr & MSR_DCD)
2464                         bits |= TIOCM_CD;
2465                 if (msr & MSR_DSR)
2466                         bits |= TIOCM_DSR;
2467                 if (msr & MSR_RI)
2468                         /* XXX not connected except for Cyclom-16Y? */
2469                         bits |= TIOCM_RI;
2470                 return (bits);
2471         }
2472         mcr = 0;
2473         if (bits & TIOCM_DTR)
2474                 mcr |= com->mcr_dtr;
2475         if (bits & TIOCM_RTS)
2476                 mcr |= com->mcr_rts;
2477         disable_intr();
2478         switch (how) {
2479         case DMSET:
2480                 com->mcr_image = mcr;
2481                 cd_setreg(com, CD1400_MSVR1, mcr);
2482                 cd_setreg(com, CD1400_MSVR2, mcr);
2483                 break;
2484         case DMBIS:
2485                 com->mcr_image = mcr = com->mcr_image | mcr;
2486                 cd_setreg(com, CD1400_MSVR1, mcr);
2487                 cd_setreg(com, CD1400_MSVR2, mcr);
2488                 break;
2489         case DMBIC:
2490                 com->mcr_image = mcr = com->mcr_image & ~mcr;
2491                 cd_setreg(com, CD1400_MSVR1, mcr);
2492                 cd_setreg(com, CD1400_MSVR2, mcr);
2493                 break;
2494         }
2495         enable_intr();
2496         return (0);
2497 }
2498
2499 static void
2500 siosettimeout()
2501 {
2502         struct com_s    *com;
2503         bool_t          someopen;
2504         int             unit;
2505
2506         /*
2507          * Set our timeout period to 1 second if no polled devices are open.
2508          * Otherwise set it to max(1/200, 1/hz).
2509          * Enable timeouts iff some device is open.
2510          */
2511         untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
2512         sio_timeout = hz;
2513         someopen = FALSE;
2514         for (unit = 0; unit < NSIO; ++unit) {
2515                 com = com_addr(unit);
2516                 if (com != NULL && com->tp != NULL
2517                     && com->tp->t_state & TS_ISOPEN) {
2518                         someopen = TRUE;
2519 #if 0
2520                         if (com->poll || com->poll_output) {
2521                                 sio_timeout = hz > 200 ? hz / 200 : 1;
2522                                 break;
2523                         }
2524 #endif
2525                 }
2526         }
2527         if (someopen) {
2528                 sio_timeouts_until_log = hz / sio_timeout;
2529                 sio_timeout_handle = timeout(comwakeup, (void *)NULL,
2530                                              sio_timeout);
2531         } else {
2532                 /* Flush error messages, if any. */
2533                 sio_timeouts_until_log = 1;
2534                 comwakeup((void *)NULL);
2535                 untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
2536         }
2537 }
2538
2539 static void
2540 comwakeup(chan)
2541         void    *chan;
2542 {
2543         struct com_s    *com;
2544         int             unit;
2545
2546         sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout);
2547
2548 #if 0
2549         /*
2550          * Recover from lost output interrupts.
2551          * Poll any lines that don't use interrupts.
2552          */
2553         for (unit = 0; unit < NSIO; ++unit) {
2554                 com = com_addr(unit);
2555                 if (com != NULL
2556                     && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
2557                         disable_intr();
2558                         siointr1(com);
2559                         enable_intr();
2560                 }
2561         }
2562 #endif
2563
2564         /*
2565          * Check for and log errors, but not too often.
2566          */
2567         if (--sio_timeouts_until_log > 0)
2568                 return;
2569         sio_timeouts_until_log = hz / sio_timeout;
2570         for (unit = 0; unit < NSIO; ++unit) {
2571                 int     errnum;
2572
2573                 com = com_addr(unit);
2574                 if (com == NULL)
2575                         continue;
2576                 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
2577                         u_int   delta;
2578                         u_long  total;
2579
2580                         disable_intr();
2581                         delta = com->delta_error_counts[errnum];
2582                         com->delta_error_counts[errnum] = 0;
2583                         enable_intr();
2584                         if (delta == 0)
2585                                 continue;
2586                         total = com->error_counts[errnum] += delta;
2587                         log(LOG_ERR, "cy%d: %u more %s%s (total %lu)\n",
2588                             unit, delta, error_desc[errnum],
2589                             delta == 1 ? "" : "s", total);
2590                 }
2591         }
2592 }
2593
2594 static void
2595 disc_optim(tp, t, com)
2596         struct tty      *tp;
2597         struct termios  *t;
2598         struct com_s    *com;
2599 {
2600 #ifndef SOFT_HOTCHAR
2601         u_char  opt;
2602 #endif
2603
2604         /*
2605          * XXX can skip a lot more cases if Smarts.  Maybe
2606          * (IGNCR | ISTRIP | IXON) in c_iflag.  But perhaps we
2607          * shouldn't skip if (TS_CNTTB | TS_LNCH) is set in t_state.
2608          */
2609         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
2610             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
2611             && (!(t->c_iflag & PARMRK)
2612                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
2613             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
2614             && linesw[tp->t_line].l_rint == ttyinput)
2615                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
2616         else
2617                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
2618         com->hotchar = linesw[tp->t_line].l_hotchar;
2619 #ifndef SOFT_HOTCHAR
2620         opt = com->cor[2] & ~CD1400_COR3_SCD34;
2621         if (com->hotchar != 0) {
2622                 cd_setreg(com, CD1400_SCHR3, com->hotchar);
2623                 cd_setreg(com, CD1400_SCHR4, com->hotchar);
2624                 opt |= CD1400_COR3_SCD34;
2625         }
2626         if (opt != com->cor[2]) {
2627                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
2628                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | CD1400_CCR_COR3);
2629         }
2630 #endif
2631 }
2632
2633 #ifdef Smarts
2634 /* standard line discipline input routine */
2635 int
2636 cyinput(c, tp)
2637         int             c;
2638         struct tty      *tp;
2639 {
2640         /* XXX duplicate ttyinput(), but without the IXOFF/IXON/ISTRIP/IPARMRK
2641          * bits, as they are done by the CD1400.  Hardly worth the effort,
2642          * given that high-throughput sessions are raw anyhow.
2643          */
2644 }
2645 #endif /* Smarts */
2646
2647 static int
2648 comspeed(speed, cy_clock, prescaler_io)
2649         speed_t speed;
2650         u_long  cy_clock;
2651         int     *prescaler_io;
2652 {
2653         int     actual;
2654         int     error;
2655         int     divider;
2656         int     prescaler;
2657         int     prescaler_unit;
2658
2659         if (speed == 0)
2660                 return (0);
2661         if (speed < 0 || speed > 150000)
2662                 return (-1);
2663
2664         /* determine which prescaler to use */
2665         for (prescaler_unit = 4, prescaler = 2048; prescaler_unit;
2666                 prescaler_unit--, prescaler >>= 2) {
2667                 if (cy_clock / prescaler / speed > 63)
2668                         break;
2669         }
2670
2671         divider = (cy_clock / prescaler * 2 / speed + 1) / 2; /* round off */
2672         if (divider > 255)
2673                 divider = 255;
2674         actual = cy_clock/prescaler/divider;
2675
2676         /* 10 times error in percent: */
2677         error = ((actual - (long)speed) * 2000 / (long)speed + 1) / 2;
2678
2679         /* 3.0% max error tolerance */
2680         if (error < -30 || error > 30)
2681                 return (-1);
2682
2683 #if 0
2684         printf("prescaler = %d (%d)\n", prescaler, prescaler_unit);
2685         printf("divider = %d (%x)\n", divider, divider);
2686         printf("actual = %d\n", actual);
2687         printf("error = %d\n", error);
2688 #endif
2689
2690         *prescaler_io = prescaler_unit;
2691         return (divider);
2692 }
2693
2694 static void
2695 cd1400_channel_cmd(com, cmd)
2696         struct com_s    *com;
2697         int             cmd;
2698 {
2699         cd1400_channel_cmd_wait(com);
2700         cd_setreg(com, CD1400_CCR, cmd);
2701         cd1400_channel_cmd_wait(com);
2702 }
2703
2704 static void
2705 cd1400_channel_cmd_wait(com)
2706         struct com_s    *com;
2707 {
2708         struct timeval  start;
2709         struct timeval  tv;
2710         long            usec;
2711
2712         if (cd_getreg(com, CD1400_CCR) == 0)
2713                 return;
2714         microtime(&start);
2715         for (;;) {
2716                 if (cd_getreg(com, CD1400_CCR) == 0)
2717                         return;
2718                 microtime(&tv);
2719                 usec = 1000000 * (tv.tv_sec - start.tv_sec) +
2720                     tv.tv_usec - start.tv_usec;
2721                 if (usec >= 5000) {
2722                         log(LOG_ERR,
2723                             "cy%d: channel command timeout (%ld usec)\n",
2724                             com->unit, usec);
2725                         return;
2726                 }
2727         }
2728 }
2729
2730 static void
2731 cd_etc(com, etc)
2732         struct com_s    *com;
2733         int             etc;
2734 {
2735         /*
2736          * We can't change the hardware's ETC state while there are any
2737          * characters in the tx fifo, since those characters would be
2738          * interpreted as commands!  Unputting characters from the fifo
2739          * is difficult, so we wait up to 12 character times for the fifo
2740          * to drain.  The command will be delayed for up to 2 character
2741          * times for the tx to become empty.  Unputting characters from
2742          * the tx holding and shift registers is impossible, so we wait
2743          * for the tx to become empty so that the command is sure to be
2744          * executed soon after we issue it.
2745          */
2746         disable_intr();
2747         if (com->etc == etc) {
2748                 enable_intr();
2749                 goto wait;
2750         }
2751         if ((etc == CD1400_ETC_SENDBREAK
2752             && (com->etc == ETC_BREAK_STARTING
2753                 || com->etc == ETC_BREAK_STARTED))
2754             || (etc == CD1400_ETC_STOPBREAK
2755                && (com->etc == ETC_BREAK_ENDING || com->etc == ETC_BREAK_ENDED
2756                    || com->etc == ETC_NONE))) {
2757                 enable_intr();
2758                 return;
2759         }
2760         com->etc = etc;
2761         cd_setreg(com, CD1400_SRER,
2762                   com->intr_enable
2763                   = (com->intr_enable & ~CD1400_SRER_TXRDY) | CD1400_SRER_TXMPTY);
2764         enable_intr();
2765 wait:
2766         while (com->etc == etc
2767                && tsleep(&com->etc, PCATCH, "cyetc", 0) == 0)
2768                 continue;
2769 }
2770
2771 static int
2772 cd_getreg(com, reg)
2773         struct com_s    *com;
2774         int             reg;
2775 {
2776         struct com_s    *basecom;
2777         u_char  car;
2778         int     cy_align;
2779         u_long  ef;
2780         cy_addr iobase;
2781         int     val;
2782
2783         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
2784         car = com->unit & CD1400_CAR_CHAN;
2785         cy_align = com->cy_align;
2786         iobase = com->iobase;
2787         ef = read_eflags();
2788         if (ef & PSL_I)
2789                 disable_intr();
2790         if (basecom->car != car)
2791                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
2792         val = cd_inb(iobase, reg, cy_align);
2793         if (ef & PSL_I)
2794                 enable_intr();
2795         return (val);
2796 }
2797
2798 static void
2799 cd_setreg(com, reg, val)
2800         struct com_s    *com;
2801         int             reg;
2802         int             val;
2803 {
2804         struct com_s    *basecom;
2805         u_char  car;
2806         int     cy_align;
2807         u_long  ef;
2808         cy_addr iobase;
2809
2810         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
2811         car = com->unit & CD1400_CAR_CHAN;
2812         cy_align = com->cy_align;
2813         iobase = com->iobase;
2814         ef = read_eflags();
2815         if (ef & PSL_I)
2816                 disable_intr();
2817         if (basecom->car != car)
2818                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
2819         cd_outb(iobase, reg, cy_align, val);
2820         if (ef & PSL_I)
2821                 enable_intr();
2822 }
2823
2824 #ifdef CyDebug
2825 /* useful in ddb */
2826 void
2827 cystatus(unit)
2828         int     unit;
2829 {
2830         struct com_s    *com;
2831         cy_addr         iobase;
2832         u_int           ocount;
2833         struct tty      *tp;
2834
2835         com = com_addr(unit);
2836         printf("info for channel %d\n", unit);
2837         printf("------------------\n");
2838         printf("total cyclom service probes:\t%d\n", cy_svrr_probes);
2839         printf("calls to upper layer:\t\t%d\n", cy_timeouts);
2840         if (com == NULL)
2841                 return;
2842         iobase = com->iobase;
2843         printf("\n");
2844         printf("cd1400 base address:\\tt%p\n", iobase);
2845         printf("saved channel_control:\t\t0x%02x\n", com->channel_control);
2846         printf("saved cor1-3:\t\t\t0x%02x 0x%02x 0x%02x\n",
2847                com->cor[0], com->cor[1], com->cor[2]);
2848         printf("service request enable reg:\t0x%02x (0x%02x cached)\n",
2849                cd_getreg(com, CD1400_SRER), com->intr_enable);
2850         printf("service request register:\t0x%02x\n",
2851                cd_inb(iobase, CD1400_SVRR, com->cy_align));
2852         printf("modem status:\t\t\t0x%02x (0x%02x cached)\n",
2853                cd_getreg(com, CD1400_MSVR2), com->prev_modem_status);
2854         printf("rx/tx/mdm interrupt registers:\t0x%02x 0x%02x 0x%02x\n",
2855                cd_inb(iobase, CD1400_RIR, com->cy_align),
2856                cd_inb(iobase, CD1400_TIR, com->cy_align),
2857                cd_inb(iobase, CD1400_MIR, com->cy_align));
2858         printf("\n");
2859         printf("com state:\t\t\t0x%02x\n", com->state);
2860         printf("calls to comstart():\t\t%d (%d useful)\n",
2861                com->start_count, com->start_real);
2862         printf("rx buffer chars free:\t\t%d\n", com->iptr - com->ibuf);
2863         ocount = 0;
2864         if (com->obufs[0].l_queued)
2865                 ocount += com->obufs[0].l_tail - com->obufs[0].l_head;
2866         if (com->obufs[1].l_queued)
2867                 ocount += com->obufs[1].l_tail - com->obufs[1].l_head;
2868         printf("tx buffer chars:\t\t%u\n", ocount);
2869         printf("received chars:\t\t\t%d\n", com->bytes_in);
2870         printf("received exceptions:\t\t%d\n", com->recv_exception);
2871         printf("modem signal deltas:\t\t%d\n", com->mdm);
2872         printf("transmitted chars:\t\t%d\n", com->bytes_out);
2873         printf("\n");
2874         tp = com->tp;
2875         if (tp != NULL) {
2876                 printf("tty state:\t\t\t0x%08x\n", tp->t_state);
2877                 printf(
2878                 "upper layer queue lengths:\t%d raw, %d canon, %d output\n",
2879                        tp->t_rawq.c_cc, tp->t_canq.c_cc, tp->t_outq.c_cc);
2880         } else
2881                 printf("tty state:\t\t\tclosed\n");
2882 }
2883 #endif /* CyDebug */