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 1.30 2008/10/20 13:16:58 sephe Exp $
  32  */
  33
  34 #include "opt_compat.h"
  35 #include "use_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/priv.h>
  76 #include <sys/conf.h>
  77 #include <sys/dkstat.h>
  78 #include <sys/fcntl.h>
  79 #include <sys/interrupt.h>
  80 #include <sys/kernel.h>
  81 #include <sys/malloc.h>
  82 #include <sys/syslog.h>
  83 #include <sys/thread2.h>
  84 #include <machine/clock.h>
  85 #ifndef SMP
  86 #include <machine/lock.h>
  87 #endif
  88 #include <machine/psl.h>
  89
  90 #include <bus/isa/isa_device.h>
  91 #include "cyreg.h"
  92 #include <machine_base/isa/ic/cd1400.h>
  93
  94 #ifdef SMP
  95 #define disable_intr()  com_lock()
  96 #define enable_intr()   com_unlock()
  97 #else
  98 #define disable_intr()  ((void)0)
  99 #define enable_intr()   ((void)0)
 100 #endif /* SMP */
 101
 102 /*
 103  * Dictionary so that I can name everything *sio* or *com* to compare with
 104  * sio.c.  There is also lots of ugly formatting and unnecessary ifdefs to
 105  * simplify the comparision.  These will go away.
 106  */
 107 #define LSR_BI          CD1400_RDSR_BREAK
 108 #define LSR_FE          CD1400_RDSR_FE
 109 #define LSR_OE          CD1400_RDSR_OE
 110 #define LSR_PE          CD1400_RDSR_PE
 111 #define MCR_DTR         CD1400_MSVR2_DTR
 112 #define MCR_RTS         CD1400_MSVR1_RTS
 113 #define MSR_CTS         CD1400_MSVR2_CTS
 114 #define MSR_DCD         CD1400_MSVR2_CD
 115 #define MSR_DSR         CD1400_MSVR2_DSR
 116 #define MSR_RI          CD1400_MSVR2_RI
 117 #define NSIO            (NCY * CY_MAX_PORTS)
 118 #define comconsole      cyconsole
 119 #define comdefaultrate  cydefaultrate
 120 #define com_events      cy_events
 121 #define comhardclose    cyhardclose
 122 #define commctl         cymctl
 123 #define comparam        cyparam
 124 #define comspeed        cyspeed
 125 #define comstart        cystart
 126 #define comwakeup       cywakeup
 127 #define nsio_tty        ncy_tty
 128 #define p_com_addr      p_cy_addr
 129 #define sioattach       cyattach
 130 #define sioclose        cyclose
 131 #define siodriver       cydriver
 132 #define siodtrwakeup    cydtrwakeup
 133 #define sioinput        cyinput
 134 #define siointr         cyintr
 135 #define siointr1        cyintr1
 136 #define sioioctl        cyioctl
 137 #define sioopen         cyopen
 138 #define siopoll         cypoll
 139 #define sioprobe        cyprobe
 140 #define siosettimeout   cysettimeout
 141 #define siosetwater     cysetwater
 142 #define comstop         cystop
 143 #define siowrite        cywrite
 144 #define sio_registered  cy_registered
 145 #define sio_timeout     cy_timeout
 146 #define sio_timeout_handle cy_timeout_handle
 147 #define sio_timeouts_until_log  cy_timeouts_until_log
 148 #define sio_tty         cy_tty
 149
 150 #define CY_MAX_PORTS            (CD1400_NO_OF_CHANNELS * CY_MAX_CD1400s)
 151
 152 /* We encode the cyclom unit number (cyu) in spare bits in the IVR's. */
 153 #define CD1400_xIVR_CHAN_SHIFT  3
 154 #define CD1400_xIVR_CHAN        0x1F
 155
 156 /*
 157  * ETC states.  com->etc may also contain a hardware ETC command value,
 158  * meaning that execution of that command is pending.
 159  */
 160 #define ETC_NONE                0       /* we depend on bzero() setting this */
 161 #define ETC_BREAK_STARTING      1
 162 #define ETC_BREAK_STARTED       2
 163 #define ETC_BREAK_ENDING        3
 164 #define ETC_BREAK_ENDED         4
 165
 166 #define LOTS_OF_EVENTS  64      /* helps separate urgent events from input */
 167
 168 #define CALLOUT_MASK            0x80
 169 #define CONTROL_MASK            0x60
 170 #define CONTROL_INIT_STATE      0x20
 171 #define CONTROL_LOCK_STATE      0x40
 172 #define DEV_TO_UNIT(dev)        (MINOR_TO_UNIT(minor(dev)))
 173 #define MINOR_MAGIC_MASK        (CALLOUT_MASK | CONTROL_MASK)
 174 /*
 175  * Not all of the magic is parametrized in the following macros.  16 and
 176  * 0xff are related to the bitfields in a udev_t.  CY_MAX_PORTS must be
 177  * ((0xff & ~MINOR_MAGIC_MASK) + 1) for things to work.
 178  */
 179 #define MINOR_TO_UNIT(mynor)    (((mynor) >> 16) * CY_MAX_PORTS \
 180                                  | (((mynor) & 0xff) & ~MINOR_MAGIC_MASK))
 181 #define UNIT_TO_MINOR(unit)     (((unit) / CY_MAX_PORTS) << 16 \
 182                                  | (((unit) & 0xff) & ~MINOR_MAGIC_MASK))
 183
 184 /*
 185  * com state bits.
 186  * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
 187  * than the other bits so that they can be tested as a group without masking
 188  * off the low bits.
 189  *
 190  * The following com and tty flags correspond closely:
 191  *      CS_BUSY         = TS_BUSY (maintained by comstart(), siopoll() and
 192  *                                 comstop())
 193  *      CS_TTGO         = ~TS_TTSTOP (maintained by comparam() and comstart())
 194  *      CS_CTS_OFLOW    = CCTS_OFLOW (maintained by comparam())
 195  *      CS_RTS_IFLOW    = CRTS_IFLOW (maintained by comparam())
 196  * TS_FLUSH is not used.
 197  * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
 198  * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
 199  */
 200 #define CS_BUSY         0x80    /* output in progress */
 201 #define CS_TTGO         0x40    /* output not stopped by XOFF */
 202 #define CS_ODEVREADY    0x20    /* external device h/w ready (CTS) */
 203 #define CS_CHECKMSR     1       /* check of MSR scheduled */
 204 #define CS_CTS_OFLOW    2       /* use CTS output flow control */
 205 #define CS_DTR_OFF      0x10    /* DTR held off */
 206 #define CS_ODONE        4       /* output completed */
 207 #define CS_RTS_IFLOW    8       /* use RTS input flow control */
 208 #define CSE_ODONE       1       /* output transmitted */
 209
 210 static  char const * const      error_desc[] = {
 211 #define CE_OVERRUN                      0
 212         "silo overflow",
 213 #define CE_INTERRUPT_BUF_OVERFLOW       1
 214         "interrupt-level buffer overflow",
 215 #define CE_TTY_BUF_OVERFLOW             2
 216         "tty-level buffer overflow",
 217 };
 218
 219 #define CE_NTYPES                       3
 220 #define CE_RECORD(com, errnum)          (++(com)->delta_error_counts[errnum])
 221
 222 /* types.  XXX - should be elsewhere */
 223 typedef u_char  bool_t;         /* boolean */
 224 typedef u_char volatile *cy_addr;
 225
 226 /* queue of linear buffers */
 227 struct lbq {
 228         u_char  *l_head;        /* next char to process */
 229         u_char  *l_tail;        /* one past the last char to process */
 230         struct lbq *l_next;     /* next in queue */
 231         bool_t  l_queued;       /* nonzero if queued */
 232 };
 233
 234 /* com device structure */
 235 struct com_s {
 236         u_char  state;          /* miscellaneous flag bits */
 237         bool_t  active_out;     /* nonzero if the callout device is open */
 238 #if 0
 239         u_char  cfcr_image;     /* copy of value written to CFCR */
 240 #endif
 241         u_char  etc;            /* pending Embedded Transmit Command */
 242         u_char  extra_state;    /* more flag bits, separate for order trick */
 243 #if 0
 244         u_char  fifo_image;     /* copy of value written to FIFO */
 245 #endif
 246         u_char  gfrcr_image;    /* copy of value read from GFRCR */
 247 #if 0
 248         bool_t  hasfifo;        /* nonzero for 16550 UARTs */
 249         bool_t  loses_outints;  /* nonzero if device loses output interrupts */
 250 #endif
 251         u_char  mcr_dtr;        /* MCR bit that is wired to DTR */
 252         u_char  mcr_image;      /* copy of value written to MCR */
 253         u_char  mcr_rts;        /* MCR bit that is wired to RTS */
 254 #if 0
 255 #ifdef COM_MULTIPORT
 256         bool_t  multiport;      /* is this unit part of a multiport device? */
 257 #endif /* COM_MULTIPORT */
 258         bool_t  no_irq;         /* nonzero if irq is not attached */
 259         bool_t  poll;           /* nonzero if polling is required */
 260         bool_t  poll_output;    /* nonzero if polling for output is required */
 261 #endif
 262         int     unit;           /* unit number */
 263         int     dtr_wait;       /* time to hold DTR down on close (* 1/hz) */
 264         struct callout dtr_ch;
 265 #if 0
 266         u_int   tx_fifo_size;
 267 #endif
 268         u_int   wopeners;       /* # processes waiting for DCD in open() */
 269
 270         /*
 271          * The high level of the driver never reads status registers directly
 272          * because there would be too many side effects to handle conveniently.
 273          * Instead, it reads copies of the registers stored here by the
 274          * interrupt handler.
 275          */
 276         u_char  last_modem_status;      /* last MSR read by intr handler */
 277         u_char  prev_modem_status;      /* last MSR handled by high level */
 278
 279         u_char  hotchar;        /* ldisc-specific char to be handled ASAP */
 280         u_char  *ibuf;          /* start of input buffer */
 281         u_char  *ibufend;       /* end of input buffer */
 282         u_char  *ibufold;       /* old input buffer, to be freed */
 283         u_char  *ihighwater;    /* threshold in input buffer */
 284         u_char  *iptr;          /* next free spot in input buffer */
 285         int     ibufsize;       /* size of ibuf (not include error bytes) */
 286         int     ierroff;        /* offset of error bytes in ibuf */
 287
 288         struct lbq      obufq;  /* head of queue of output buffers */
 289         struct lbq      obufs[2];       /* output buffers */
 290
 291         int     cy_align;       /* index for register alignment */
 292         cy_addr cy_iobase;      /* base address of this port's cyclom */
 293         cy_addr iobase;         /* base address of this port's cd1400 */
 294         int     mcr_rts_reg;    /* cd1400 reg number of reg holding mcr_rts */
 295
 296         struct tty      *tp;    /* cross reference */
 297
 298         /* Initial state. */
 299         struct termios  it_in;  /* should be in struct tty */
 300         struct termios  it_out;
 301
 302         /* Lock state. */
 303         struct termios  lt_in;  /* should be in struct tty */
 304         struct termios  lt_out;
 305
 306         bool_t  do_timestamp;
 307         bool_t  do_dcd_timestamp;
 308         struct timeval  timestamp;
 309         struct timeval  dcd_timestamp;
 310
 311         u_long  bytes_in;       /* statistics */
 312         u_long  bytes_out;
 313         u_int   delta_error_counts[CE_NTYPES];
 314         u_long  error_counts[CE_NTYPES];
 315
 316         u_int   recv_exception; /* exception chars received */
 317         u_int   mdm;            /* modem signal changes */
 318 #ifdef CyDebug
 319         u_int   start_count;    /* no. of calls to comstart() */
 320         u_int   start_real;     /* no. of calls that did something */
 321 #endif
 322         u_char  car;            /* CD1400 CAR shadow (if first unit in cd) */
 323         u_char  channel_control;/* CD1400 CCR control command shadow */
 324         u_char  cor[3];         /* CD1400 COR1-3 shadows */
 325         u_char  intr_enable;    /* CD1400 SRER shadow */
 326
 327         /*
 328          * Data area for output buffers.  Someday we should build the output
 329          * buffer queue without copying data.
 330          */
 331         u_char  obuf1[256];
 332         u_char  obuf2[256];
 333 };
 334
 335 /* PCI driver entry point. */
 336 int     cyattach_common         (cy_addr cy_iobase, int cy_align);
 337 void    siointr(void *);
 338
 339 static  int     cy_units        (cy_addr cy_iobase, int cy_align);
 340 static  int     sioattach       (struct isa_device *dev);
 341 static  void    cd1400_channel_cmd (struct com_s *com, int cmd);
 342 static  void    cd1400_channel_cmd_wait (struct com_s *com);
 343 static  void    cd_etc          (struct com_s *com, int etc);
 344 static  int     cd_getreg       (struct com_s *com, int reg);
 345 static  void    cd_setreg       (struct com_s *com, int reg, int val);
 346 static  timeout_t siodtrwakeup;
 347 static  void    comhardclose    (struct com_s *com);
 348 static  void    sioinput        (struct com_s *com);
 349 #if 0
 350 static  void    siointr1        (struct com_s *com);
 351 #endif
 352 static  int     commctl         (struct com_s *com, int bits, int how);
 353 static  int     comparam        (struct tty *tp, struct termios *t);
 354 static  inthand2_t siopoll;
 355 static  int     sioprobe        (struct isa_device *dev);
 356 static  void    siosettimeout   (void);
 357 static  int     siosetwater     (struct com_s *com, speed_t speed);
 358 static  int     comspeed        (speed_t speed, u_long cy_clock,
 359                                      int *prescaler_io);
 360 static  void    comstart        (struct tty *tp);
 361 static  void    comstop         (struct tty *tp, int rw);
 362 static  timeout_t comwakeup;
 363 static  void    disc_optim      (struct tty     *tp, struct termios *t,
 364                                      struct com_s *com);
 365
 366 #ifdef CyDebug
 367 void    cystatus        (int unit);
 368 #endif
 369
 370 static char driver_name[] = "cy";
 371
 372 /* table and macro for fast conversion from a unit number to its com struct */
 373 static  struct com_s    *p_com_addr[NSIO];
 374 #define com_addr(unit)  (p_com_addr[unit])
 375
 376 struct isa_driver       siodriver = {
 377         sioprobe, sioattach, driver_name
 378 };
 379
 380 static  d_open_t        sioopen;
 381 static  d_close_t       sioclose;
 382 static  d_write_t       siowrite;
 383 static  d_ioctl_t       sioioctl;
 384
 385 #define CDEV_MAJOR      48
 386 static struct dev_ops sio_ops = {
 387         { driver_name, CDEV_MAJOR, D_TTY | D_KQFILTER },
 388         .d_open =       sioopen,
 389         .d_close =      sioclose,
 390         .d_read =       ttyread,
 391         .d_write =      siowrite,
 392         .d_ioctl =      sioioctl,
 393         .d_poll =       ttypoll,
 394         .d_kqfilter =   ttykqfilter
 395 };
 396
 397 static  int     comconsole = -1;
 398 static  speed_t comdefaultrate = TTYDEF_SPEED;
 399 static  u_int   com_events;     /* input chars + weighted output completions */
 400 static  bool_t  sio_registered;
 401 static  int     sio_timeout;
 402 static  int     sio_timeouts_until_log;
 403 static  struct  callout sio_timeout_handle;
 404 #if 0 /* XXX */
 405 static struct tty       *sio_tty[NSIO];
 406 #else
 407 static struct tty       sio_tty[NSIO];
 408 #endif
 409 static  const int       nsio_tty = NSIO;
 410
 411 #ifdef CyDebug
 412 static  u_int   cd_inbs;
 413 static  u_int   cy_inbs;
 414 static  u_int   cd_outbs;
 415 static  u_int   cy_outbs;
 416 static  u_int   cy_svrr_probes;
 417 static  u_int   cy_timeouts;
 418 #endif
 419
 420 static  int     cy_chip_offset[] = {
 421         0x0000, 0x0400, 0x0800, 0x0c00, 0x0200, 0x0600, 0x0a00, 0x0e00,
 422 };
 423 static  int     cy_nr_cd1400s[NCY];
 424 static  int     cy_total_devices;
 425 #undef  RxFifoThreshold
 426 static  int     volatile RxFifoThreshold = (CD1400_RX_FIFO_SIZE / 2);
 427
 428 static int
 429 sioprobe(struct isa_device *dev)
 430 {
 431         cy_addr iobase;
 432
 433         iobase = (cy_addr)dev->id_maddr;
 434
 435         /* Cyclom-16Y hardware reset (Cyclom-8Ys don't care) */
 436         cy_inb(iobase, CY16_RESET, 0);  /* XXX? */
 437         DELAY(500);     /* wait for the board to get its act together */
 438
 439         /* this is needed to get the board out of reset */
 440         cy_outb(iobase, CY_CLEAR_INTR, 0, 0);
 441         DELAY(500);
 442
 443         return (cy_units(iobase, 0) == 0 ? 0 : -1);
 444 }
 445
 446 static int
 447 cy_units(cy_addr cy_iobase, int cy_align)
 448 {
 449         int     cyu;
 450         u_char  firmware_version = 0;  /* assign to avoid warning */
 451         int     i;
 452         cy_addr iobase;
 453
 454         for (cyu = 0; cyu < CY_MAX_CD1400s; ++cyu) {
 455                 iobase = cy_iobase + (cy_chip_offset[cyu] << cy_align);
 456
 457                 /* wait for chip to become ready for new command */
 458                 for (i = 0; i < 10; i++) {
 459                         DELAY(50);
 460                         if (!cd_inb(iobase, CD1400_CCR, cy_align))
 461                                 break;
 462                 }
 463
 464                 /* clear the GFRCR register */
 465                 cd_outb(iobase, CD1400_GFRCR, cy_align, 0);
 466
 467                 /* issue a reset command */
 468                 cd_outb(iobase, CD1400_CCR, cy_align,
 469                         CD1400_CCR_CMDRESET | CD1400_CCR_FULLRESET);
 470
 471                 /* wait for the CD1400 to initialize itself */
 472                 for (i = 0; i < 200; i++) {
 473                         DELAY(50);
 474
 475                         /* retrieve firmware version */
 476                         firmware_version = cd_inb(iobase, CD1400_GFRCR,
 477                                                   cy_align);
 478                         if ((firmware_version & 0xf0) == 0x40)
 479                                 break;
 480                 }
 481
 482                 /*
 483                  * Anything in the 0x40-0x4F range is fine.
 484                  * If one CD1400 is bad then we don't support higher
 485                  * numbered good ones on this board.
 486                  */
 487                 if ((firmware_version & 0xf0) != 0x40)
 488                         break;
 489         }
 490         return (cyu);
 491 }
 492
 493 static int
 494 sioattach(struct isa_device *isdp)
 495 {
 496         int     adapter;
 497
 498         adapter = cyattach_common((cy_addr) isdp->id_maddr, 0);
 499         if (adapter < 0)
 500                 return (0);
 501
 502         /*
 503          * XXX
 504          * This kludge is to allow ISA/PCI device specifications in the
 505          * kernel config file to be in any order.
 506          */
 507         if (isdp->id_unit != adapter) {
 508                 kprintf("cy%d: attached as cy%d\n", isdp->id_unit, adapter);
 509                 isdp->id_unit = adapter;        /* XXX */
 510         }
 511         isdp->id_intr = (inthand2_t *)siointr;
 512         /* isdp->id_ri_flags |= RI_FAST; XXX unimplemented - use newbus! */
 513         return (1);
 514 }
 515
 516 int
 517 cyattach_common(cy_addr cy_iobase, int cy_align)
 518 {
 519         int     adapter;
 520         int     cyu;
 521         u_char  firmware_version;
 522         cy_addr iobase;
 523         int     minorbase;
 524         int     ncyu;
 525         int     unit;
 526
 527         adapter = cy_total_devices;
 528         if ((u_int)adapter >= NCY) {
 529                 kprintf(
 530         "cy%d: can't attach adapter: insufficient cy devices configured\n",
 531                        adapter);
 532                 return (-1);
 533         }
 534         ncyu = cy_units(cy_iobase, cy_align);
 535         if (ncyu == 0)
 536                 return (-1);
 537         cy_nr_cd1400s[adapter] = ncyu;
 538         cy_total_devices++;
 539
 540         unit = adapter * CY_MAX_PORTS;
 541         for (cyu = 0; cyu < ncyu; ++cyu) {
 542                 int     cdu;
 543
 544                 iobase = (cy_addr) (cy_iobase
 545                                     + (cy_chip_offset[cyu] << cy_align));
 546                 firmware_version = cd_inb(iobase, CD1400_GFRCR, cy_align);
 547
 548                 /* Set up a receive timeout period of than 1+ ms. */
 549                 cd_outb(iobase, CD1400_PPR, cy_align,
 550                         howmany(CY_CLOCK(firmware_version)
 551                                 / CD1400_PPR_PRESCALER, 1000));
 552
 553                 for (cdu = 0; cdu < CD1400_NO_OF_CHANNELS; ++cdu, ++unit) {
 554                         struct com_s    *com;
 555
 556         com = kmalloc(sizeof *com, M_DEVBUF, M_WAITOK | M_ZERO);
 557         com->unit = unit;
 558                         callout_init(&com->dtr_ch);
 559                         com->gfrcr_image = firmware_version;
 560                         if (CY_RTS_DTR_SWAPPED(firmware_version)) {
 561                                 com->mcr_dtr = MCR_RTS;
 562                                 com->mcr_rts = MCR_DTR;
 563                                 com->mcr_rts_reg = CD1400_MSVR2;
 564                         } else {
 565                                 com->mcr_dtr = MCR_DTR;
 566                                 com->mcr_rts = MCR_RTS;
 567                                 com->mcr_rts_reg = CD1400_MSVR1;
 568                         }
 569         com->dtr_wait = 3 * hz;
 570         com->obufs[0].l_head = com->obuf1;
 571         com->obufs[1].l_head = com->obuf2;
 572
 573                         com->cy_align = cy_align;
 574                         com->cy_iobase = cy_iobase;
 575         com->iobase = iobase;
 576                         com->car = ~CD1400_CAR_CHAN;
 577
 578         /*
 579          * We don't use all the flags from <sys/ttydefaults.h> since they
 580          * are only relevant for logins.  It's important to have echo off
 581          * initially so that the line doesn't start blathering before the
 582          * echo flag can be turned off.
 583          */
 584         com->it_in.c_iflag = 0;
 585         com->it_in.c_oflag = 0;
 586         com->it_in.c_cflag = TTYDEF_CFLAG;
 587         com->it_in.c_lflag = 0;
 588         if (unit == comconsole) {
 589                 com->it_in.c_iflag = TTYDEF_IFLAG;
 590                 com->it_in.c_oflag = TTYDEF_OFLAG;
 591                 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
 592                 com->it_in.c_lflag = TTYDEF_LFLAG;
 593                 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL;
 594         }
 595         if (siosetwater(com, com->it_in.c_ispeed) != 0) {
 596                 enable_intr();
 597                 kfree(com, M_DEVBUF);
 598                 return (0);
 599         }
 600         enable_intr();
 601         termioschars(&com->it_in);
 602         com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
 603         com->it_out = com->it_in;
 604
 605         crit_enter();
 606         com_addr(unit) = com;
 607         crit_exit();
 608
 609         if (!sio_registered) {
 610                 callout_init(&sio_timeout_handle);
 611                 register_swi(SWI_TTY, siopoll, NULL, "cy", NULL);
 612                 sio_registered = TRUE;
 613         }
 614         minorbase = UNIT_TO_MINOR(unit);
 615         dev_ops_add(&sio_ops, UNIT_TO_MINOR(-1), minorbase);
 616         make_dev(&sio_ops, minorbase,
 617                 UID_ROOT, GID_WHEEL, 0600, "ttyc%r%r", adapter,
 618                 unit % CY_MAX_PORTS);
 619         make_dev(&sio_ops, minorbase | CONTROL_INIT_STATE,
 620                 UID_ROOT, GID_WHEEL, 0600, "ttyic%r%r", adapter,
 621                 unit % CY_MAX_PORTS);
 622         make_dev(&sio_ops, minorbase | CONTROL_LOCK_STATE,
 623                 UID_ROOT, GID_WHEEL, 0600, "ttylc%r%r", adapter,
 624                 unit % CY_MAX_PORTS);
 625         make_dev(&sio_ops, minorbase | CALLOUT_MASK,
 626                 UID_UUCP, GID_DIALER, 0660, "cuac%r%r", adapter,
 627                 unit % CY_MAX_PORTS);
 628         make_dev(&sio_ops, minorbase | CALLOUT_MASK | CONTROL_INIT_STATE,
 629                 UID_UUCP, GID_DIALER, 0660, "cuaic%r%r", adapter,
 630                 unit % CY_MAX_PORTS);
 631         make_dev(&sio_ops, minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE,
 632                 UID_UUCP, GID_DIALER, 0660, "cualc%r%r", adapter,
 633                 unit % CY_MAX_PORTS);
 634
 635         /* for(cdu...), for(cyu...) terminating blocks */
 636                 }
 637         }
 638
 639         /* ensure an edge for the next interrupt */
 640         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
 641
 642         return (adapter);
 643 }
 644
 645 static int
 646 sioopen(struct dev_open_args *ap)
 647 {
 648         cdev_t dev = ap->a_head.a_dev;
 649         struct com_s    *com;
 650         int             error;
 651         int             mynor;
 652         struct tty      *tp;
 653         int             unit;
 654
 655         mynor = minor(dev);
 656         unit = MINOR_TO_UNIT(mynor);
 657         if ((u_int) unit >= NSIO || (com = com_addr(unit)) == NULL)
 658                 return (ENXIO);
 659         if (mynor & CONTROL_MASK)
 660                 return (0);
 661 #if 0 /* XXX */
 662         tp = com->tp = sio_tty[unit] = ttymalloc(sio_tty[unit]);
 663 #else
 664         tp = com->tp = &sio_tty[unit];
 665 #endif
 666         dev->si_tty = tp;
 667         crit_enter();
 668         /*
 669          * We jump to this label after all non-interrupted sleeps to pick
 670          * up any changes of the device state.
 671          */
 672 open_top:
 673         while (com->state & CS_DTR_OFF) {
 674                 error = tsleep(&com->dtr_wait, PCATCH, "cydtr", 0);
 675                 if (error != 0)
 676                         goto out;
 677         }
 678         if (tp->t_state & TS_ISOPEN) {
 679                 /*
 680                  * The device is open, so everything has been initialized.
 681                  * Handle conflicts.
 682                  */
 683                 if (mynor & CALLOUT_MASK) {
 684                         if (!com->active_out) {
 685                                 error = EBUSY;
 686                                 goto out;
 687                         }
 688                 } else {
 689                         if (com->active_out) {
 690                                 if (ap->a_oflags & O_NONBLOCK) {
 691                                         error = EBUSY;
 692                                         goto out;
 693                                 }
 694                                 error = tsleep(&com->active_out,
 695                                                PCATCH, "cybi", 0);
 696                                 if (error != 0)
 697                                         goto out;
 698                                 goto open_top;
 699                         }
 700                 }
 701                 if (tp->t_state & TS_XCLUDE &&
 702                     priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
 703                         error = EBUSY;
 704                         goto out;
 705                 }
 706         } else {
 707                 /*
 708                  * The device isn't open, so there are no conflicts.
 709                  * Initialize it.  Initialization is done twice in many
 710                  * cases: to preempt sleeping callin opens if we are
 711                  * callout, and to complete a callin open after DCD rises.
 712                  */
 713                 tp->t_oproc = comstart;
 714                 tp->t_stop = comstop;
 715                 tp->t_param = comparam;
 716                 tp->t_dev = dev;
 717                 tp->t_termios = mynor & CALLOUT_MASK
 718                                 ? com->it_out : com->it_in;
 719
 720                 /* Encode per-board unit in LIVR for access in intr routines. */
 721                 cd_setreg(com, CD1400_LIVR,
 722                           (unit & CD1400_xIVR_CHAN) << CD1400_xIVR_CHAN_SHIFT);
 723
 724                 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET);
 725 #if 0
 726                 com->poll = com->no_irq;
 727                 com->poll_output = com->loses_outints;
 728 #endif
 729                 ++com->wopeners;
 730                 error = comparam(tp, &tp->t_termios);
 731                 --com->wopeners;
 732                 if (error != 0)
 733                         goto out;
 734 #if 0
 735                 if (com->hasfifo) {
 736                         /*
 737                          * (Re)enable and flush fifos.
 738                          *
 739                          * Certain SMC chips cause problems if the fifos
 740                          * are enabled while input is ready.  Turn off the
 741                          * fifo if necessary to clear the input.  We test
 742                          * the input ready bit after enabling the fifos
 743                          * since we've already enabled them in comparam()
 744                          * and to handle races between enabling and fresh
 745                          * input.
 746                          */
 747                         while (TRUE) {
 748                                 outb(iobase + com_fifo,
 749                                      FIFO_RCV_RST | FIFO_XMT_RST
 750                                      | com->fifo_image);
 751                                 DELAY(100);
 752                                 if (!(inb(com->line_status_port) & LSR_RXRDY))
 753                                         break;
 754                                 outb(iobase + com_fifo, 0);
 755                                 DELAY(100);
 756                                 (void) inb(com->data_port);
 757                         }
 758                 }
 759
 760                 disable_intr();
 761                 (void) inb(com->line_status_port);
 762                 (void) inb(com->data_port);
 763                 com->prev_modem_status = com->last_modem_status
 764                     = inb(com->modem_status_port);
 765                 outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS
 766                                        | IER_EMSC);
 767                 enable_intr();
 768 #else /* !0 */
 769                 /*
 770                  * Flush fifos.  This requires a full channel reset which
 771                  * also disables the transmitter and receiver.  Recover
 772                  * from this.
 773                  */
 774                 cd1400_channel_cmd(com,
 775                                    CD1400_CCR_CMDRESET | CD1400_CCR_CHANRESET);
 776                 cd1400_channel_cmd(com, com->channel_control);
 777
 778                 disable_intr();
 779                 com->prev_modem_status = com->last_modem_status
 780                     = cd_getreg(com, CD1400_MSVR2);
 781                 cd_setreg(com, CD1400_SRER,
 782                           com->intr_enable
 783                           = CD1400_SRER_MDMCH | CD1400_SRER_RXDATA);
 784                 enable_intr();
 785 #endif /* 0 */
 786                 /*
 787                  * Handle initial DCD.  Callout devices get a fake initial
 788                  * DCD (trapdoor DCD).  If we are callout, then any sleeping
 789                  * callin opens get woken up and resume sleeping on "cybi"
 790                  * instead of "cydcd".
 791                  */
 792                 /*
 793                  * XXX `mynor & CALLOUT_MASK' should be
 794                  * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
 795                  * TRAPDOOR_CARRIER is the default initial state for callout
 796                  * devices and SOFT_CARRIER is like CLOCAL except it hides
 797                  * the true carrier.
 798                  */
 799                 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK)
 800                         (*linesw[tp->t_line].l_modem)(tp, 1);
 801         }
 802         /*
 803          * Wait for DCD if necessary.
 804          */
 805         if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK)
 806             && !(tp->t_cflag & CLOCAL) && !(ap->a_oflags & O_NONBLOCK)) {
 807                 ++com->wopeners;
 808                 error = tsleep(TSA_CARR_ON(tp), PCATCH, "cydcd", 0);
 809                 --com->wopeners;
 810                 if (error != 0)
 811                         goto out;
 812                 goto open_top;
 813         }
 814         error = (*linesw[tp->t_line].l_open)(dev, tp);
 815         disc_optim(tp, &tp->t_termios, com);
 816         if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
 817                 com->active_out = TRUE;
 818         siosettimeout();
 819 out:
 820         crit_exit();
 821         if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
 822                 comhardclose(com);
 823         return (error);
 824 }
 825
 826 static int
 827 sioclose(struct dev_close_args *ap)
 828 {
 829         cdev_t dev = ap->a_head.a_dev;
 830         struct com_s    *com;
 831         int             mynor;
 832         struct tty      *tp;
 833
 834         mynor = minor(dev);
 835         if (mynor & CONTROL_MASK)
 836                 return (0);
 837         com = com_addr(MINOR_TO_UNIT(mynor));
 838         tp = com->tp;
 839         crit_enter();
 840         cd_etc(com, CD1400_ETC_STOPBREAK);
 841         (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 842         disc_optim(tp, &tp->t_termios, com);
 843         comstop(tp, FREAD | FWRITE);
 844         comhardclose(com);
 845         ttyclose(tp);
 846         siosettimeout();
 847         crit_exit();
 848 #ifdef broken /* session holds a ref to the tty; can't deallocate */
 849         ttyfree(tp);
 850         com->tp = sio_tty[unit] = NULL;
 851 #endif
 852         return (0);
 853 }
 854
 855 static void
 856 comhardclose(struct com_s *com)
 857 {
 858         cy_addr         iobase;
 859         struct tty      *tp;
 860         int             unit;
 861
 862         unit = com->unit;
 863         iobase = com->iobase;
 864         crit_enter();
 865 #if 0
 866         com->poll = FALSE;
 867         com->poll_output = FALSE;
 868 #endif
 869         com->do_timestamp = 0;
 870 #if 0
 871         outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
 872 #else
 873         /* XXX */
 874         disable_intr();
 875         com->etc = ETC_NONE;
 876         cd_setreg(com, CD1400_COR2, com->cor[1] &= ~CD1400_COR2_ETC);
 877         enable_intr();
 878         cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
 879 #endif
 880
 881         {
 882 #if 0
 883                 outb(iobase + com_ier, 0);
 884 #else
 885                 disable_intr();
 886                 cd_setreg(com, CD1400_SRER, com->intr_enable = 0);
 887                 enable_intr();
 888 #endif
 889                 tp = com->tp;
 890                 if ((tp->t_cflag & HUPCL)
 891                     /*
 892                      * XXX we will miss any carrier drop between here and the
 893                      * next open.  Perhaps we should watch DCD even when the
 894                      * port is closed; it is not sufficient to check it at
 895                      * the next open because it might go up and down while
 896                      * we're not watching.
 897                      */
 898                     || (!com->active_out
 899                        && !(com->prev_modem_status & MSR_DCD)
 900                        && !(com->it_in.c_cflag & CLOCAL))
 901                     || !(tp->t_state & TS_ISOPEN)) {
 902                         (void)commctl(com, TIOCM_DTR, DMBIC);
 903
 904                         /* Disable receiver (leave transmitter enabled). */
 905                         com->channel_control = CD1400_CCR_CMDCHANCTL
 906                                                | CD1400_CCR_XMTEN
 907                                                | CD1400_CCR_RCVDIS;
 908                         cd1400_channel_cmd(com, com->channel_control);
 909
 910                         if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) {
 911                                 callout_reset(&com->dtr_ch, com->dtr_wait,
 912                                                 siodtrwakeup, com);
 913                                 com->state |= CS_DTR_OFF;
 914                         }
 915                 }
 916         }
 917 #if 0
 918         if (com->hasfifo) {
 919                 /*
 920                  * Disable fifos so that they are off after controlled
 921                  * reboots.  Some BIOSes fail to detect 16550s when the
 922                  * fifos are enabled.
 923                  */
 924                 outb(iobase + com_fifo, 0);
 925         }
 926 #endif
 927         com->active_out = FALSE;
 928         wakeup(&com->active_out);
 929         wakeup(TSA_CARR_ON(tp));        /* restart any wopeners */
 930         crit_exit();
 931 }
 932
 933 static int
 934 siowrite(struct dev_write_args *ap)
 935 {
 936         cdev_t dev = ap->a_head.a_dev;
 937         struct uio *uio = ap->a_uio;
 938         int             mynor;
 939         struct tty      *tp;
 940         int             unit;
 941
 942         mynor = minor(dev);
 943         if (mynor & CONTROL_MASK)
 944                 return (ENODEV);
 945
 946         unit = MINOR_TO_UNIT(mynor);
 947         tp = com_addr(unit)->tp;
 948         /*
 949          * (XXX) We disallow virtual consoles if the physical console is
 950          * a serial port.  This is in case there is a display attached that
 951          * is not the console.  In that situation we don't need/want the X
 952          * server taking over the console.
 953          */
 954         if (constty != NULL && unit == comconsole)
 955                 constty = NULL;
 956 #ifdef Smarts
 957         /* XXX duplicate ttwrite(), but without so much output processing on
 958          * CR & LF chars.  Hardly worth the effort, given that high-throughput
 959          * sessions are raw anyhow.
 960          */
 961 #else
 962         return ((*linesw[tp->t_line].l_write)(tp, uio, ap->a_ioflag));
 963 #endif
 964 }
 965
 966 static void
 967 siodtrwakeup(void *chan)
 968 {
 969         struct com_s    *com;
 970
 971         com = (struct com_s *)chan;
 972         com->state &= ~CS_DTR_OFF;
 973         wakeup(&com->dtr_wait);
 974 }
 975
 976 static void
 977 sioinput(struct com_s *com)
 978 {
 979         u_char          *buf;
 980         int             incc;
 981         u_char          line_status;
 982         int             recv_data;
 983         struct tty      *tp;
 984
 985         buf = com->ibuf;
 986         tp = com->tp;
 987         if (!(tp->t_state & TS_ISOPEN)) {
 988                 com_events -= (com->iptr - com->ibuf);
 989                 com->iptr = com->ibuf;
 990                 return;
 991         }
 992         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
 993                 /*
 994                  * Avoid the grotesquely inefficient lineswitch routine
 995                  * (ttyinput) in "raw" mode.  It usually takes about 450
 996                  * instructions (that's without canonical processing or echo!).
 997                  * slinput is reasonably fast (usually 40 instructions plus
 998                  * call overhead).
 999                  */
1000                 do {
1001                         enable_intr();
1002                         incc = com->iptr - buf;
1003                         if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
1004                             && (com->state & CS_RTS_IFLOW
1005                                 || tp->t_iflag & IXOFF)
1006                             && !(tp->t_state & TS_TBLOCK))
1007                                 ttyblock(tp);
1008                         com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
1009                                 += b_to_q((char *)buf, incc, &tp->t_rawq);
1010                         buf += incc;
1011                         tk_nin += incc;
1012                         tk_rawcc += incc;
1013                         tp->t_rawcc += incc;
1014                         ttwakeup(tp);
1015                         if (tp->t_state & TS_TTSTOP
1016                             && (tp->t_iflag & IXANY
1017                                 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1018                                 tp->t_state &= ~TS_TTSTOP;
1019                                 tp->t_lflag &= ~FLUSHO;
1020                                 comstart(tp);
1021                         }
1022                         disable_intr();
1023                 } while (buf < com->iptr);
1024         } else {
1025                 do {
1026                         enable_intr();
1027                         line_status = buf[com->ierroff];
1028                         recv_data = *buf++;
1029                         if (line_status
1030                             & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
1031                                 if (line_status & LSR_BI)
1032                                         recv_data |= TTY_BI;
1033                                 if (line_status & LSR_FE)
1034                                         recv_data |= TTY_FE;
1035                                 if (line_status & LSR_OE)
1036                                         recv_data |= TTY_OE;
1037                                 if (line_status & LSR_PE)
1038                                         recv_data |= TTY_PE;
1039                         }
1040                         (*linesw[tp->t_line].l_rint)(recv_data, tp);
1041                         disable_intr();
1042                 } while (buf < com->iptr);
1043         }
1044         com_events -= (com->iptr - com->ibuf);
1045         com->iptr = com->ibuf;
1046
1047         /*
1048          * There is now room for another low-level buffer full of input,
1049          * so enable RTS if it is now disabled and there is room in the
1050          * high-level buffer.
1051          */
1052         if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & com->mcr_rts) &&
1053             !(tp->t_state & TS_TBLOCK))
1054 #if 0
1055                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1056 #else
1057                 cd_setreg(com, com->mcr_rts_reg,
1058                           com->mcr_image |= com->mcr_rts);
1059 #endif
1060 }
1061
1062 void
1063 siointr(void *arg)
1064 {
1065         int     unit = (int)arg;
1066         int     baseu;
1067         int     cy_align;
1068         cy_addr cy_iobase;
1069         int     cyu;
1070         cy_addr iobase;
1071         u_char  status;
1072
1073         com_lock();     /* XXX could this be placed down lower in the loop? */
1074
1075         baseu = unit * CY_MAX_PORTS;
1076         cy_align = com_addr(baseu)->cy_align;
1077         cy_iobase = com_addr(baseu)->cy_iobase;
1078
1079         /* check each CD1400 in turn */
1080         for (cyu = 0; cyu < cy_nr_cd1400s[unit]; ++cyu) {
1081                 iobase = (cy_addr) (cy_iobase
1082                                     + (cy_chip_offset[cyu] << cy_align));
1083                 /* poll to see if it has any work */
1084                 status = cd_inb(iobase, CD1400_SVRR, cy_align);
1085                 if (status == 0)
1086                         continue;
1087 #ifdef CyDebug
1088                 ++cy_svrr_probes;
1089 #endif
1090                 /* service requests as appropriate, giving priority to RX */
1091                 if (status & CD1400_SVRR_RXRDY) {
1092                         struct com_s    *com;
1093                         u_int           count;
1094                         u_char          *ioptr;
1095                         u_char          line_status;
1096                         u_char          recv_data;
1097                         u_char          serv_type;
1098 #ifdef PollMode
1099                         u_char          save_rir;
1100 #endif
1101
1102 #ifdef PollMode
1103                         save_rir = cd_inb(iobase, CD1400_RIR, cy_align);
1104
1105                         /* enter rx service */
1106                         cd_outb(iobase, CD1400_CAR, cy_align, save_rir);
1107                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
1108                         = save_rir & CD1400_CAR_CHAN;
1109
1110                         serv_type = cd_inb(iobase, CD1400_RIVR, cy_align);
1111                         com = com_addr(baseu
1112                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
1113                                           & CD1400_xIVR_CHAN));
1114 #else
1115                         /* ack receive service */
1116                         serv_type = cy_inb(iobase, CY8_SVCACKR, cy_align);
1117
1118                         com = com_addr(baseu +
1119                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
1120                                           & CD1400_xIVR_CHAN));
1121 #endif
1122
1123                 if (serv_type & CD1400_RIVR_EXCEPTION) {
1124                         ++com->recv_exception;
1125                         line_status = cd_inb(iobase, CD1400_RDSR, cy_align);
1126                         /* break/unnattached error bits or real input? */
1127                         recv_data = cd_inb(iobase, CD1400_RDSR, cy_align);
1128 #ifndef SOFT_HOTCHAR
1129                         if (line_status & CD1400_RDSR_SPECIAL
1130                             && com->hotchar != 0)
1131                                 setsofttty();
1132 #endif
1133 #if 1 /* XXX "intelligent" PFO error handling would break O error handling */
1134                         if (line_status & (LSR_PE|LSR_FE|LSR_BI)) {
1135                                 /*
1136                                   Don't store PE if IGNPAR and BI if IGNBRK,
1137                                   this hack allows "raw" tty optimization
1138                                   works even if IGN* is set.
1139                                 */
1140                                 if (   com->tp == NULL
1141                                     || !(com->tp->t_state & TS_ISOPEN)
1142                                     || ((line_status & (LSR_PE|LSR_FE))
1143                                     &&  (com->tp->t_iflag & IGNPAR))
1144                                     || ((line_status & LSR_BI)
1145                                     &&  (com->tp->t_iflag & IGNBRK)))
1146                                         goto cont;
1147                                 if (   (line_status & (LSR_PE|LSR_FE))
1148                                     && (com->tp->t_state & TS_CAN_BYPASS_L_RINT)
1149                                     && ((line_status & LSR_FE)
1150                                     ||  ((line_status & LSR_PE)
1151                                     &&  (com->tp->t_iflag & INPCK))))
1152                                         recv_data = 0;
1153                         }
1154 #endif /* 1 */
1155                         ++com->bytes_in;
1156 #ifdef SOFT_HOTCHAR
1157                         if (com->hotchar != 0 && recv_data == com->hotchar)
1158                                 setsofttty();
1159 #endif
1160                         ioptr = com->iptr;
1161                         if (ioptr >= com->ibufend)
1162                                 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
1163                         else {
1164                                 if (com->do_timestamp)
1165                                         microtime(&com->timestamp);
1166                                 ++com_events;
1167                                 ioptr[0] = recv_data;
1168                                 ioptr[com->ierroff] = line_status;
1169                                 com->iptr = ++ioptr;
1170                                 if (ioptr == com->ihighwater
1171                                     && com->state & CS_RTS_IFLOW)
1172 #if 0
1173                                         outb(com->modem_ctl_port,
1174                                              com->mcr_image &= ~MCR_RTS);
1175 #else
1176                                         cd_outb(iobase, com->mcr_rts_reg,
1177                                                 cy_align,
1178                                                 com->mcr_image &=
1179                                                 ~com->mcr_rts);
1180 #endif
1181                                 if (line_status & LSR_OE)
1182                                         CE_RECORD(com, CE_OVERRUN);
1183                         }
1184                         goto cont;
1185                 } else {
1186                         int     ifree;
1187
1188                         count = cd_inb(iobase, CD1400_RDCR, cy_align);
1189                         if (!count)
1190                                 goto cont;
1191                         com->bytes_in += count;
1192                         ioptr = com->iptr;
1193                         ifree = com->ibufend - ioptr;
1194                         if (count > ifree) {
1195                                 count -= ifree;
1196                                 com_events += ifree;
1197                                 if (ifree != 0) {
1198                                         if (com->do_timestamp)
1199                                                 microtime(&com->timestamp);
1200                                         do {
1201                                                 recv_data = cd_inb(iobase,
1202                                                                    CD1400_RDSR,
1203                                                                    cy_align);
1204 #ifdef SOFT_HOTCHAR
1205                                                 if (com->hotchar != 0
1206                                                     && recv_data
1207                                                        == com->hotchar)
1208                                                         setsofttty();
1209 #endif
1210                                                 ioptr[0] = recv_data;
1211                                                 ioptr[com->ierroff] = 0;
1212                                                 ++ioptr;
1213                                         } while (--ifree != 0);
1214                                 }
1215                                 com->delta_error_counts
1216                                     [CE_INTERRUPT_BUF_OVERFLOW] += count;
1217                                 do {
1218                                         recv_data = cd_inb(iobase, CD1400_RDSR,
1219                                                            cy_align);
1220 #ifdef SOFT_HOTCHAR
1221                                         if (com->hotchar != 0
1222                                             && recv_data == com->hotchar)
1223                                                 setsofttty();
1224 #endif
1225                                 } while (--count != 0);
1226                         } else {
1227                                 if (com->do_timestamp)
1228                                         microtime(&com->timestamp);
1229                                 if (ioptr <= com->ihighwater
1230                                     && ioptr + count > com->ihighwater
1231                                     && com->state & CS_RTS_IFLOW)
1232 #if 0
1233                                         outb(com->modem_ctl_port,
1234                                              com->mcr_image &= ~MCR_RTS);
1235 #else
1236                                         cd_outb(iobase, com->mcr_rts_reg,
1237                                                 cy_align,
1238                                                 com->mcr_image
1239                                                 &= ~com->mcr_rts);
1240 #endif
1241                                 com_events += count;
1242                                 do {
1243                                         recv_data = cd_inb(iobase, CD1400_RDSR,
1244                                                            cy_align);
1245 #ifdef SOFT_HOTCHAR
1246                                         if (com->hotchar != 0
1247                                             && recv_data == com->hotchar)
1248                                                 setsofttty();
1249 #endif
1250                                         ioptr[0] = recv_data;
1251                                         ioptr[com->ierroff] = 0;
1252                                         ++ioptr;
1253                                 } while (--count != 0);
1254                         }
1255                         com->iptr = ioptr;
1256                 }
1257 cont:
1258
1259                         /* terminate service context */
1260 #ifdef PollMode
1261                         cd_outb(iobase, CD1400_RIR, cy_align,
1262                                 save_rir
1263                                 & ~(CD1400_RIR_RDIREQ | CD1400_RIR_RBUSY));
1264 #else
1265                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
1266 #endif
1267                 }
1268                 if (status & CD1400_SVRR_MDMCH) {
1269                         struct com_s    *com;
1270                         u_char  modem_status;
1271 #ifdef PollMode
1272                         u_char  save_mir;
1273 #else
1274                         u_char  vector;
1275 #endif
1276
1277 #ifdef PollMode
1278                         save_mir = cd_inb(iobase, CD1400_MIR, cy_align);
1279
1280                         /* enter modem service */
1281                         cd_outb(iobase, CD1400_CAR, cy_align, save_mir);
1282                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
1283                         = save_mir & CD1400_CAR_CHAN;
1284
1285                         com = com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS
1286                                        + (save_mir & CD1400_MIR_CHAN));
1287 #else
1288                         /* ack modem service */
1289                         vector = cy_inb(iobase, CY8_SVCACKM, cy_align);
1290
1291                         com = com_addr(baseu
1292                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
1293                                           & CD1400_xIVR_CHAN));
1294 #endif
1295                         ++com->mdm;
1296                         modem_status = cd_inb(iobase, CD1400_MSVR2, cy_align);
1297                 if (modem_status != com->last_modem_status) {
1298                         if (com->do_dcd_timestamp
1299                             && !(com->last_modem_status & MSR_DCD)
1300                             && modem_status & MSR_DCD)
1301                                 microtime(&com->dcd_timestamp);
1302
1303                         /*
1304                          * Schedule high level to handle DCD changes.  Note
1305                          * that we don't use the delta bits anywhere.  Some
1306                          * UARTs mess them up, and it's easy to remember the
1307                          * previous bits and calculate the delta.
1308                          */
1309                         com->last_modem_status = modem_status;
1310                         if (!(com->state & CS_CHECKMSR)) {
1311                                 com_events += LOTS_OF_EVENTS;
1312                                 com->state |= CS_CHECKMSR;
1313                                 setsofttty();
1314                         }
1315
1316 #ifdef SOFT_CTS_OFLOW
1317                         /* handle CTS change immediately for crisp flow ctl */
1318                         if (com->state & CS_CTS_OFLOW) {
1319                                 if (modem_status & MSR_CTS) {
1320                                         com->state |= CS_ODEVREADY;
1321                                         if (com->state >= (CS_BUSY | CS_TTGO
1322                                                            | CS_ODEVREADY)
1323                                             && !(com->intr_enable
1324                                                  & CD1400_SRER_TXRDY))
1325                                                 cd_outb(iobase, CD1400_SRER,
1326                                                         cy_align,
1327                                                         com->intr_enable
1328                                                         = com->intr_enable
1329                                                           & ~CD1400_SRER_TXMPTY
1330                                                           | CD1400_SRER_TXRDY);
1331                                 } else {
1332                                         com->state &= ~CS_ODEVREADY;
1333                                         if (com->intr_enable
1334                                             & CD1400_SRER_TXRDY)
1335                                                 cd_outb(iobase, CD1400_SRER,
1336                                                         cy_align,
1337                                                         com->intr_enable
1338                                                         = com->intr_enable
1339                                                           & ~CD1400_SRER_TXRDY
1340                                                           | CD1400_SRER_TXMPTY);
1341                                 }
1342                         }
1343 #endif
1344                 }
1345
1346                         /* terminate service context */
1347 #ifdef PollMode
1348                         cd_outb(iobase, CD1400_MIR, cy_align,
1349                                 save_mir
1350                                 & ~(CD1400_MIR_RDIREQ | CD1400_MIR_RBUSY));
1351 #else
1352                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
1353 #endif
1354                 }
1355                 if (status & CD1400_SVRR_TXRDY) {
1356                         struct com_s    *com;
1357 #ifdef PollMode
1358                         u_char  save_tir;
1359 #else
1360                         u_char  vector;
1361 #endif
1362
1363 #ifdef PollMode
1364                         save_tir = cd_inb(iobase, CD1400_TIR, cy_align);
1365
1366                         /* enter tx service */
1367                         cd_outb(iobase, CD1400_CAR, cy_align, save_tir);
1368                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
1369                         = save_tir & CD1400_CAR_CHAN;
1370
1371                         com = com_addr(baseu
1372                                        + cyu * CD1400_NO_OF_CHANNELS
1373                                        + (save_tir & CD1400_TIR_CHAN));
1374 #else
1375                         /* ack transmit service */
1376                         vector = cy_inb(iobase, CY8_SVCACKT, cy_align);
1377
1378                         com = com_addr(baseu
1379                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
1380                                           & CD1400_xIVR_CHAN));
1381 #endif
1382
1383                         if (com->etc != ETC_NONE) {
1384                                 if (com->intr_enable & CD1400_SRER_TXRDY) {
1385                                         /*
1386                                          * Here due to sloppy SRER_TXRDY
1387                                          * enabling.  Ignore.  Come back when
1388                                          * tx is empty.
1389                                          */
1390                                         cd_outb(iobase, CD1400_SRER, cy_align,
1391                                                 com->intr_enable
1392                                                 = (com->intr_enable
1393                                                   & ~CD1400_SRER_TXRDY)
1394                                                   | CD1400_SRER_TXMPTY);
1395                                         goto terminate_tx_service;
1396                                 }
1397                                 switch (com->etc) {
1398                                 case CD1400_ETC_SENDBREAK:
1399                                 case CD1400_ETC_STOPBREAK:
1400                                         /*
1401                                          * Start the command.  Come back on
1402                                          * next tx empty interrupt, hopefully
1403                                          * after command has been executed.
1404                                          */
1405                                         cd_outb(iobase, CD1400_COR2, cy_align,
1406                                                 com->cor[1] |= CD1400_COR2_ETC);
1407                                         cd_outb(iobase, CD1400_TDR, cy_align,
1408                                                 CD1400_ETC_CMD);
1409                                         cd_outb(iobase, CD1400_TDR, cy_align,
1410                                                 com->etc);
1411                                         if (com->etc == CD1400_ETC_SENDBREAK)
1412                                                 com->etc = ETC_BREAK_STARTING;
1413                                         else
1414                                                 com->etc = ETC_BREAK_ENDING;
1415                                         goto terminate_tx_service;
1416                                 case ETC_BREAK_STARTING:
1417                                         /*
1418                                          * BREAK is now on.  Continue with
1419                                          * SRER_TXMPTY processing, hopefully
1420                                          * don't come back.
1421                                          */
1422                                         com->etc = ETC_BREAK_STARTED;
1423                                         break;
1424                                 case ETC_BREAK_STARTED:
1425                                         /*
1426                                          * Came back due to sloppy SRER_TXMPTY
1427                                          * enabling.  Hope again.
1428                                          */
1429                                         break;
1430                                 case ETC_BREAK_ENDING:
1431                                         /*
1432                                          * BREAK is now off.  Continue with
1433                                          * SRER_TXMPTY processing and don't
1434                                          * come back.  The SWI handler will
1435                                          * restart tx interrupts if necessary.
1436                                          */
1437                                         cd_outb(iobase, CD1400_COR2, cy_align,
1438                                                 com->cor[1]
1439                                                 &= ~CD1400_COR2_ETC);
1440                                         com->etc = ETC_BREAK_ENDED;
1441                                         if (!(com->state & CS_ODONE)) {
1442                                                 com_events += LOTS_OF_EVENTS;
1443                                                 com->state |= CS_ODONE;
1444                                                 setsofttty();
1445                                         }
1446                                         break;
1447                                 case ETC_BREAK_ENDED:
1448                                         /*
1449                                          * Shouldn't get here.  Hope again.
1450                                          */
1451                                         break;
1452                                 }
1453                         }
1454                         if (com->intr_enable & CD1400_SRER_TXMPTY) {
1455                                 if (!(com->extra_state & CSE_ODONE)) {
1456                                         com_events += LOTS_OF_EVENTS;
1457                                         com->extra_state |= CSE_ODONE;
1458                                         setsofttty();
1459                                 }
1460                                 cd_outb(iobase, CD1400_SRER, cy_align,
1461                                         com->intr_enable
1462                                         &= ~CD1400_SRER_TXMPTY);
1463                                 goto terminate_tx_service;
1464                         }
1465                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
1466                         u_char  *ioptr;
1467                         u_int   ocount;
1468
1469                         ioptr = com->obufq.l_head;
1470                                 ocount = com->obufq.l_tail - ioptr;
1471                                 if (ocount > CD1400_TX_FIFO_SIZE)
1472                                         ocount = CD1400_TX_FIFO_SIZE;
1473                                 com->bytes_out += ocount;
1474                                 do
1475                                         cd_outb(iobase, CD1400_TDR, cy_align,
1476                                                 *ioptr++);
1477                                 while (--ocount != 0);
1478                         com->obufq.l_head = ioptr;
1479                         if (ioptr >= com->obufq.l_tail) {
1480                                 struct lbq      *qp;
1481
1482                                 qp = com->obufq.l_next;
1483                                 qp->l_queued = FALSE;
1484                                 qp = qp->l_next;
1485                                 if (qp != NULL) {
1486                                         com->obufq.l_head = qp->l_head;
1487                                         com->obufq.l_tail = qp->l_tail;
1488                                         com->obufq.l_next = qp;
1489                                 } else {
1490                                         /* output just completed */
1491                                         com->state &= ~CS_BUSY;
1492
1493                                         /*
1494                                          * The setting of CSE_ODONE may be
1495                                          * stale here.  We currently only
1496                                          * use it when CS_BUSY is set, and
1497                                          * fixing it when we clear CS_BUSY
1498                                          * is easiest.
1499                                          */
1500                                         if (com->extra_state & CSE_ODONE) {
1501                                                 com_events -= LOTS_OF_EVENTS;
1502                                                 com->extra_state &= ~CSE_ODONE;
1503                                         }
1504
1505                                         cd_outb(iobase, CD1400_SRER, cy_align,
1506                                                 com->intr_enable
1507                                                 = (com->intr_enable
1508                                                   & ~CD1400_SRER_TXRDY)
1509                                                   | CD1400_SRER_TXMPTY);
1510                                 }
1511                                 if (!(com->state & CS_ODONE)) {
1512                                         com_events += LOTS_OF_EVENTS;
1513                                         com->state |= CS_ODONE;
1514
1515                                         /* handle at high level ASAP */
1516                                         setsofttty();
1517                                 }
1518                         }
1519                 }
1520
1521                         /* terminate service context */
1522 terminate_tx_service:
1523 #ifdef PollMode
1524                         cd_outb(iobase, CD1400_TIR, cy_align,
1525                                 save_tir
1526                                 & ~(CD1400_TIR_RDIREQ | CD1400_TIR_RBUSY));
1527 #else
1528                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
1529 #endif
1530                 }
1531         }
1532
1533         /* ensure an edge for the next interrupt */
1534         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
1535
1536         schedsofttty();
1537
1538         com_unlock();
1539 }
1540
1541 #if 0
1542 static void
1543 siointr1(struct com_s *com)
1544 {
1545 }
1546 #endif
1547
1548 static int
1549 sioioctl(struct dev_ioctl_args *ap)
1550 {
1551         cdev_t dev = ap->a_head.a_dev;
1552         caddr_t data = ap->a_data;
1553         u_long cmd = ap->a_cmd;
1554         struct com_s    *com;
1555         int             error;
1556         int             mynor;
1557         struct tty      *tp;
1558 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1559         int             oldcmd;
1560         struct termios  term;
1561 #endif
1562
1563         mynor = minor(dev);
1564         com = com_addr(MINOR_TO_UNIT(mynor));
1565         if (mynor & CONTROL_MASK) {
1566                 struct termios  *ct;
1567
1568                 switch (mynor & CONTROL_MASK) {
1569                 case CONTROL_INIT_STATE:
1570                         ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in;
1571                         break;
1572                 case CONTROL_LOCK_STATE:
1573                         ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in;
1574                         break;
1575                 default:
1576                         return (ENODEV);        /* /dev/nodev */
1577                 }
1578                 switch (cmd) {
1579                 case TIOCSETA:
1580                         error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0);
1581                         if (error != 0)
1582                                 return (error);
1583                         *ct = *(struct termios *)data;
1584                         return (0);
1585                 case TIOCGETA:
1586                         *(struct termios *)data = *ct;
1587                         return (0);
1588                 case TIOCGETD:
1589                         *(int *)data = TTYDISC;
1590                         return (0);
1591                 case TIOCGWINSZ:
1592                         bzero(data, sizeof(struct winsize));
1593                         return (0);
1594                 default:
1595                         return (ENOTTY);
1596                 }
1597         }
1598         tp = com->tp;
1599 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1600         term = tp->t_termios;
1601         oldcmd = cmd;
1602         error = ttsetcompat(tp, &cmd, data, &term);
1603         if (error != 0)
1604                 return (error);
1605         if (cmd != oldcmd)
1606                 data = (caddr_t)&term;
1607 #endif
1608         if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
1609                 int     cc;
1610                 struct termios *dt = (struct termios *)data;
1611                 struct termios *lt = mynor & CALLOUT_MASK
1612                                      ? &com->lt_out : &com->lt_in;
1613
1614                 dt->c_iflag = (tp->t_iflag & lt->c_iflag)
1615                               | (dt->c_iflag & ~lt->c_iflag);
1616                 dt->c_oflag = (tp->t_oflag & lt->c_oflag)
1617                               | (dt->c_oflag & ~lt->c_oflag);
1618                 dt->c_cflag = (tp->t_cflag & lt->c_cflag)
1619                               | (dt->c_cflag & ~lt->c_cflag);
1620                 dt->c_lflag = (tp->t_lflag & lt->c_lflag)
1621                               | (dt->c_lflag & ~lt->c_lflag);
1622                 for (cc = 0; cc < NCCS; ++cc)
1623                         if (lt->c_cc[cc] != 0)
1624                                 dt->c_cc[cc] = tp->t_cc[cc];
1625                 if (lt->c_ispeed != 0)
1626                         dt->c_ispeed = tp->t_ispeed;
1627                 if (lt->c_ospeed != 0)
1628                         dt->c_ospeed = tp->t_ospeed;
1629         }
1630         error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data,
1631                                               ap->a_fflag, ap->a_cred);
1632         if (error != ENOIOCTL)
1633                 return (error);
1634         crit_enter();
1635         error = ttioctl(tp, cmd, data, ap->a_fflag);
1636         disc_optim(tp, &tp->t_termios, com);
1637         if (error != ENOIOCTL) {
1638                 crit_exit();
1639                 return (error);
1640         }
1641         switch (cmd) {
1642         case TIOCSBRK:
1643 #if 0
1644                 outb(iobase + com_cfcr, com->cfcr_image |= CFCR_SBREAK);
1645 #else
1646                 cd_etc(com, CD1400_ETC_SENDBREAK);
1647 #endif
1648                 break;
1649         case TIOCCBRK:
1650 #if 0
1651                 outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1652 #else
1653                 cd_etc(com, CD1400_ETC_STOPBREAK);
1654 #endif
1655                 break;
1656         case TIOCSDTR:
1657                 (void)commctl(com, TIOCM_DTR, DMBIS);
1658                 break;
1659         case TIOCCDTR:
1660                 (void)commctl(com, TIOCM_DTR, DMBIC);
1661                 break;
1662         /*
1663          * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set.  The
1664          * changes get undone on the next call to comparam().
1665          */
1666         case TIOCMSET:
1667                 (void)commctl(com, *(int *)data, DMSET);
1668                 break;
1669         case TIOCMBIS:
1670                 (void)commctl(com, *(int *)data, DMBIS);
1671                 break;
1672         case TIOCMBIC:
1673                 (void)commctl(com, *(int *)data, DMBIC);
1674                 break;
1675         case TIOCMGET:
1676                 *(int *)data = commctl(com, 0, DMGET);
1677                 break;
1678         case TIOCMSDTRWAIT:
1679                 /* must be root since the wait applies to following logins */
1680                 error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0);
1681                 if (error != 0) {
1682                         crit_exit();
1683                         return (error);
1684                 }
1685                 com->dtr_wait = *(int *)data * hz / 100;
1686                 break;
1687         case TIOCMGDTRWAIT:
1688                 *(int *)data = com->dtr_wait * 100 / hz;
1689                 break;
1690         case TIOCTIMESTAMP:
1691                 com->do_timestamp = TRUE;
1692                 *(struct timeval *)data = com->timestamp;
1693                 break;
1694         case TIOCDCDTIMESTAMP:
1695                 com->do_dcd_timestamp = TRUE;
1696                 *(struct timeval *)data = com->dcd_timestamp;
1697                 break;
1698         default:
1699                 crit_exit();
1700                 return (ENOTTY);
1701         }
1702         crit_exit();
1703         return (0);
1704 }
1705
1706 static void
1707 siopoll(void *data, void *frame)
1708 {
1709         int             unit;
1710
1711 #ifdef CyDebug
1712         ++cy_timeouts;
1713 #endif
1714         if (com_events == 0)
1715                 return;
1716 repeat:
1717         for (unit = 0; unit < NSIO; ++unit) {
1718                 struct com_s    *com;
1719                 int             incc;
1720                 struct tty      *tp;
1721
1722                 com = com_addr(unit);
1723                 if (com == NULL)
1724                         continue;
1725                 tp = com->tp;
1726                 if (tp == NULL) {
1727                         /*
1728                          * XXX forget any events related to closed devices
1729                          * (actually never opened devices) so that we don't
1730                          * loop.
1731                          */
1732                         disable_intr();
1733                         incc = com->iptr - com->ibuf;
1734                         com->iptr = com->ibuf;
1735                         if (com->state & CS_CHECKMSR) {
1736                                 incc += LOTS_OF_EVENTS;
1737                                 com->state &= ~CS_CHECKMSR;
1738                         }
1739                         com_events -= incc;
1740                         enable_intr();
1741                         if (incc != 0)
1742                                 log(LOG_DEBUG,
1743                                     "sio%d: %d events for device with no tp\n",
1744                                     unit, incc);
1745                         continue;
1746                 }
1747                 if (com->iptr != com->ibuf) {
1748                         disable_intr();
1749                         sioinput(com);
1750                         enable_intr();
1751                 }
1752                 if (com->state & CS_CHECKMSR) {
1753                         u_char  delta_modem_status;
1754
1755                         disable_intr();
1756                         delta_modem_status = com->last_modem_status
1757                                              ^ com->prev_modem_status;
1758                         com->prev_modem_status = com->last_modem_status;
1759                         com_events -= LOTS_OF_EVENTS;
1760                         com->state &= ~CS_CHECKMSR;
1761                         enable_intr();
1762                         if (delta_modem_status & MSR_DCD)
1763                                 (*linesw[tp->t_line].l_modem)
1764                                         (tp, com->prev_modem_status & MSR_DCD);
1765                 }
1766                 if (com->extra_state & CSE_ODONE) {
1767                         disable_intr();
1768                         com_events -= LOTS_OF_EVENTS;
1769                         com->extra_state &= ~CSE_ODONE;
1770                         enable_intr();
1771                         if (!(com->state & CS_BUSY)) {
1772                                 tp->t_state &= ~TS_BUSY;
1773                                 ttwwakeup(com->tp);
1774                         }
1775                         if (com->etc != ETC_NONE) {
1776                                 if (com->etc == ETC_BREAK_ENDED)
1777                                         com->etc = ETC_NONE;
1778                                 wakeup(&com->etc);
1779                         }
1780                 }
1781                 if (com->state & CS_ODONE) {
1782                         disable_intr();
1783                         com_events -= LOTS_OF_EVENTS;
1784                         com->state &= ~CS_ODONE;
1785                         enable_intr();
1786                         (*linesw[tp->t_line].l_start)(tp);
1787                 }
1788                 if (com_events == 0)
1789                         break;
1790         }
1791         if (com_events >= LOTS_OF_EVENTS)
1792                 goto repeat;
1793 }
1794
1795 static int
1796 comparam(struct tty *tp, struct termios *t)
1797 {
1798         int             bits;
1799         int             cflag;
1800         struct com_s    *com;
1801         u_char          cor_change;
1802         u_long          cy_clock;
1803         int             idivisor;
1804         int             iflag;
1805         int             iprescaler;
1806         int             itimeout;
1807         int             odivisor;
1808         int             oprescaler;
1809         u_char          opt;
1810         int             unit;
1811
1812         /* do historical conversions */
1813         if (t->c_ispeed == 0)
1814                 t->c_ispeed = t->c_ospeed;
1815
1816         unit = DEV_TO_UNIT(tp->t_dev);
1817         com = com_addr(unit);
1818
1819         /* check requested parameters */
1820         cy_clock = CY_CLOCK(com->gfrcr_image);
1821         idivisor = comspeed(t->c_ispeed, cy_clock, &iprescaler);
1822         if (idivisor < 0)
1823                 return (EINVAL);
1824         odivisor = comspeed(t->c_ospeed, cy_clock, &oprescaler);
1825         if (odivisor < 0)
1826                 return (EINVAL);
1827
1828         /* parameters are OK, convert them to the com struct and the device */
1829         crit_enter();
1830         if (odivisor == 0)
1831                 (void)commctl(com, TIOCM_DTR, DMBIC);   /* hang up line */
1832         else
1833                 (void)commctl(com, TIOCM_DTR, DMBIS);
1834
1835         /*
1836          * This returns with interrupts disabled so that we can complete
1837          * the speed change atomically.
1838          */
1839         (void) siosetwater(com, t->c_ispeed);
1840
1841         /* XXX we don't actually change the speed atomically. */
1842         enable_intr();
1843
1844         if (idivisor != 0) {
1845                 cd_setreg(com, CD1400_RBPR, idivisor);
1846                 cd_setreg(com, CD1400_RCOR, iprescaler);
1847         }
1848         if (odivisor != 0) {
1849                 cd_setreg(com, CD1400_TBPR, odivisor);
1850                 cd_setreg(com, CD1400_TCOR, oprescaler);
1851         }
1852
1853         /*
1854          * channel control
1855          *      receiver enable
1856          *      transmitter enable (always set)
1857          */
1858         cflag = t->c_cflag;
1859         opt = CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTEN
1860               | (cflag & CREAD ? CD1400_CCR_RCVEN : CD1400_CCR_RCVDIS);
1861         if (opt != com->channel_control) {
1862                 com->channel_control = opt;
1863                 cd1400_channel_cmd(com, opt);
1864         }
1865
1866 #ifdef Smarts
1867         /* set special chars */
1868         /* XXX if one is _POSIX_VDISABLE, can't use some others */
1869         if (t->c_cc[VSTOP] != _POSIX_VDISABLE)
1870                 cd_setreg(com, CD1400_SCHR1, t->c_cc[VSTOP]);
1871         if (t->c_cc[VSTART] != _POSIX_VDISABLE)
1872                 cd_setreg(com, CD1400_SCHR2, t->c_cc[VSTART]);
1873         if (t->c_cc[VINTR] != _POSIX_VDISABLE)
1874                 cd_setreg(com, CD1400_SCHR3, t->c_cc[VINTR]);
1875         if (t->c_cc[VSUSP] != _POSIX_VDISABLE)
1876                 cd_setreg(com, CD1400_SCHR4, t->c_cc[VSUSP]);
1877 #endif
1878
1879         /*
1880          * set channel option register 1 -
1881          *      parity mode
1882          *      stop bits
1883          *      char length
1884          */
1885         opt = 0;
1886         /* parity */
1887         if (cflag & PARENB) {
1888                 if (cflag & PARODD)
1889                         opt |= CD1400_COR1_PARODD;
1890                 opt |= CD1400_COR1_PARNORMAL;
1891         }
1892         iflag = t->c_iflag;
1893         if (!(iflag & INPCK))
1894                 opt |= CD1400_COR1_NOINPCK;
1895         bits = 1 + 1;
1896         /* stop bits */
1897         if (cflag & CSTOPB) {
1898                 ++bits;
1899                 opt |= CD1400_COR1_STOP2;
1900         }
1901         /* char length */
1902         switch (cflag & CSIZE) {
1903         case CS5:
1904                 bits += 5;
1905                 opt |= CD1400_COR1_CS5;
1906                 break;
1907         case CS6:
1908                 bits += 6;
1909                 opt |= CD1400_COR1_CS6;
1910                 break;
1911         case CS7:
1912                 bits += 7;
1913                 opt |= CD1400_COR1_CS7;
1914                 break;
1915         default:
1916                 bits += 8;
1917                 opt |= CD1400_COR1_CS8;
1918                 break;
1919         }
1920         cor_change = 0;
1921         if (opt != com->cor[0]) {
1922                 cor_change |= CD1400_CCR_COR1;
1923                 cd_setreg(com, CD1400_COR1, com->cor[0] = opt);
1924         }
1925
1926         /*
1927          * Set receive time-out period, normally to max(one char time, 5 ms).
1928          */
1929         if (t->c_ispeed == 0)
1930                 itimeout = cd_getreg(com, CD1400_RTPR);
1931         else {
1932                 itimeout = (1000 * bits + t->c_ispeed - 1) / t->c_ispeed;
1933 #ifdef SOFT_HOTCHAR
1934 #define MIN_RTP         1
1935 #else
1936 #define MIN_RTP         5
1937 #endif
1938                 if (itimeout < MIN_RTP)
1939                         itimeout = MIN_RTP;
1940         }
1941         if (!(t->c_lflag & ICANON) && t->c_cc[VMIN] != 0 && t->c_cc[VTIME] != 0
1942             && t->c_cc[VTIME] * 10 > itimeout)
1943                 itimeout = t->c_cc[VTIME] * 10;
1944         if (itimeout > 255)
1945                 itimeout = 255;
1946         cd_setreg(com, CD1400_RTPR, itimeout);
1947
1948         /*
1949          * set channel option register 2 -
1950          *      flow control
1951          */
1952         opt = 0;
1953 #ifdef Smarts
1954         if (iflag & IXANY)
1955                 opt |= CD1400_COR2_IXANY;
1956         if (iflag & IXOFF)
1957                 opt |= CD1400_COR2_IXOFF;
1958 #endif
1959 #ifndef SOFT_CTS_OFLOW
1960         if (cflag & CCTS_OFLOW)
1961                 opt |= CD1400_COR2_CCTS_OFLOW;
1962 #endif
1963         disable_intr();
1964         if (opt != com->cor[1]) {
1965                 cor_change |= CD1400_CCR_COR2;
1966                 cd_setreg(com, CD1400_COR2, com->cor[1] = opt);
1967         }
1968         enable_intr();
1969
1970         /*
1971          * set channel option register 3 -
1972          *      receiver FIFO interrupt threshold
1973          *      flow control
1974          */
1975         opt = RxFifoThreshold;
1976 #ifdef Smarts
1977         if (t->c_lflag & ICANON)
1978                 opt |= CD1400_COR3_SCD34;       /* detect INTR & SUSP chars */
1979         if (iflag & IXOFF)
1980                 /* detect and transparently handle START and STOP chars */
1981                 opt |= CD1400_COR3_FCT | CD1400_COR3_SCD12;
1982 #endif
1983         if (opt != com->cor[2]) {
1984                 cor_change |= CD1400_CCR_COR3;
1985                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
1986         }
1987
1988         /* notify the CD1400 if COR1-3 have changed */
1989         if (cor_change)
1990                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | cor_change);
1991
1992         /*
1993          * set channel option register 4 -
1994          *      CR/NL processing
1995          *      break processing
1996          *      received exception processing
1997          */
1998         opt = 0;
1999         if (iflag & IGNCR)
2000                 opt |= CD1400_COR4_IGNCR;
2001 #ifdef Smarts
2002         /*
2003          * we need a new ttyinput() for this, as we don't want to
2004          * have ICRNL && INLCR being done in both layers, or to have
2005          * synchronisation problems
2006          */
2007         if (iflag & ICRNL)
2008                 opt |= CD1400_COR4_ICRNL;
2009         if (iflag & INLCR)
2010                 opt |= CD1400_COR4_INLCR;
2011 #endif
2012         if (iflag & IGNBRK)
2013                 opt |= CD1400_COR4_IGNBRK | CD1400_COR4_NOBRKINT;
2014         /*
2015          * The `-ignbrk -brkint parmrk' case is not handled by the hardware,
2016          * so only tell the hardware about -brkint if -parmrk.
2017          */
2018         if (!(iflag & (BRKINT | PARMRK)))
2019                 opt |= CD1400_COR4_NOBRKINT;
2020 #if 0
2021         /* XXX using this "intelligence" breaks reporting of overruns. */
2022         if (iflag & IGNPAR)
2023                 opt |= CD1400_COR4_PFO_DISCARD;
2024         else {
2025                 if (iflag & PARMRK)
2026                         opt |= CD1400_COR4_PFO_ESC;
2027                 else
2028                         opt |= CD1400_COR4_PFO_NUL;
2029         }
2030 #else
2031         opt |= CD1400_COR4_PFO_EXCEPTION;
2032 #endif
2033         cd_setreg(com, CD1400_COR4, opt);
2034
2035         /*
2036          * set channel option register 5 -
2037          */
2038         opt = 0;
2039         if (iflag & ISTRIP)
2040                 opt |= CD1400_COR5_ISTRIP;
2041         if (t->c_iflag & IEXTEN)
2042                 /* enable LNEXT (e.g. ctrl-v quoting) handling */
2043                 opt |= CD1400_COR5_LNEXT;
2044 #ifdef Smarts
2045         if (t->c_oflag & ONLCR)
2046                 opt |= CD1400_COR5_ONLCR;
2047         if (t->c_oflag & OCRNL)
2048                 opt |= CD1400_COR5_OCRNL;
2049 #endif
2050         cd_setreg(com, CD1400_COR5, opt);
2051
2052         /*
2053          * We always generate modem status change interrupts for CD changes.
2054          * Among other things, this is necessary to track TS_CARR_ON for
2055          * pstat to print even when the driver doesn't care.  CD changes
2056          * should be rare so interrupts for them are not worth extra code to
2057          * avoid.  We avoid interrupts for other modem status changes (except
2058          * for CTS changes when SOFT_CTS_OFLOW is configured) since this is
2059          * simplest and best.
2060          */
2061
2062         /*
2063          * set modem change option register 1
2064          *      generate modem interrupts on which 1 -> 0 input transitions
2065          *      also controls auto-DTR output flow-control, which we don't use
2066          */
2067         opt = CD1400_MCOR1_CDzd;
2068 #ifdef SOFT_CTS_OFLOW
2069         if (cflag & CCTS_OFLOW)
2070                 opt |= CD1400_MCOR1_CTSzd;
2071 #endif
2072         cd_setreg(com, CD1400_MCOR1, opt);
2073
2074         /*
2075          * set modem change option register 2
2076          *      generate modem interrupts on specific 0 -> 1 input transitions
2077          */
2078         opt = CD1400_MCOR2_CDod;
2079 #ifdef SOFT_CTS_OFLOW
2080         if (cflag & CCTS_OFLOW)
2081                 opt |= CD1400_MCOR2_CTSod;
2082 #endif
2083         cd_setreg(com, CD1400_MCOR2, opt);
2084
2085         /*
2086          * XXX should have done this long ago, but there is too much state
2087          * to change all atomically.
2088          */
2089         disable_intr();
2090
2091         com->state &= ~CS_TTGO;
2092         if (!(tp->t_state & TS_TTSTOP))
2093                 com->state |= CS_TTGO;
2094         if (cflag & CRTS_IFLOW) {
2095                 com->state |= CS_RTS_IFLOW;
2096                 /*
2097                  * If CS_RTS_IFLOW just changed from off to on, the change
2098                  * needs to be propagated to MCR_RTS.  This isn't urgent,
2099                  * so do it later by calling comstart() instead of repeating
2100                  * a lot of code from comstart() here.
2101                  */
2102         } else if (com->state & CS_RTS_IFLOW) {
2103                 com->state &= ~CS_RTS_IFLOW;
2104                 /*
2105                  * CS_RTS_IFLOW just changed from on to off.  Force MCR_RTS
2106                  * on here, since comstart() won't do it later.
2107                  */
2108 #if 0
2109                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2110 #else
2111                 cd_setreg(com, com->mcr_rts_reg,
2112                           com->mcr_image |= com->mcr_rts);
2113 #endif
2114         }
2115
2116         /*
2117          * Set up state to handle output flow control.
2118          * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
2119          * Now has 10+ msec latency, while CTS flow has 50- usec latency.
2120          */
2121         com->state |= CS_ODEVREADY;
2122 #ifdef SOFT_CTS_OFLOW
2123         com->state &= ~CS_CTS_OFLOW;
2124         if (cflag & CCTS_OFLOW) {
2125                 com->state |= CS_CTS_OFLOW;
2126                 if (!(com->last_modem_status & MSR_CTS))
2127                         com->state &= ~CS_ODEVREADY;
2128         }
2129 #endif
2130         /* XXX shouldn't call functions while intrs are disabled. */
2131         disc_optim(tp, t, com);
2132 #if 0
2133         /*
2134          * Recover from fiddling with CS_TTGO.  We used to call siointr1()
2135          * unconditionally, but that defeated the careful discarding of
2136          * stale input in sioopen().
2137          */
2138         if (com->state >= (CS_BUSY | CS_TTGO))
2139                 siointr1(com);
2140 #endif
2141         if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
2142                 if (!(com->intr_enable & CD1400_SRER_TXRDY))
2143                         cd_setreg(com, CD1400_SRER,
2144                                   com->intr_enable
2145                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
2146                                     | CD1400_SRER_TXRDY);
2147         } else {
2148                 if (com->intr_enable & CD1400_SRER_TXRDY)
2149                         cd_setreg(com, CD1400_SRER,
2150                                   com->intr_enable
2151                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
2152                                     | CD1400_SRER_TXMPTY);
2153         }
2154
2155         enable_intr();
2156         crit_exit();
2157         comstart(tp);
2158         if (com->ibufold != NULL) {
2159                 kfree(com->ibufold, M_DEVBUF);
2160                 com->ibufold = NULL;
2161         }
2162         return (0);
2163 }
2164
2165 static int
2166 siosetwater(struct com_s *com, speed_t speed)
2167 {
2168         int             cp4ticks;
2169         u_char          *ibuf;
2170         int             ibufsize;
2171         struct tty      *tp;
2172
2173         /*
2174          * Make the buffer size large enough to handle a softtty interrupt
2175          * latency of about 2 ticks without loss of throughput or data
2176          * (about 3 ticks if input flow control is not used or not honoured,
2177          * but a bit less for CS5-CS7 modes).
2178          */
2179         cp4ticks = speed / 10 / hz * 4;
2180         for (ibufsize = 128; ibufsize < cp4ticks;)
2181                 ibufsize <<= 1;
2182         if (ibufsize == com->ibufsize) {
2183                 disable_intr();
2184                 return (0);
2185         }
2186
2187         /*
2188          * Allocate input buffer.  The extra factor of 2 in the size is
2189          * to allow for an error byte for each input byte.
2190          */
2191         ibuf = kmalloc(2 * ibufsize, M_DEVBUF, M_WAITOK);
2192
2193         /* Initialize non-critical variables. */
2194         com->ibufold = com->ibuf;
2195         com->ibufsize = ibufsize;
2196         tp = com->tp;
2197         if (tp != NULL) {
2198                 tp->t_ififosize = 2 * ibufsize;
2199                 tp->t_ispeedwat = (speed_t)-1;
2200                 tp->t_ospeedwat = (speed_t)-1;
2201         }
2202
2203         /*
2204          * Read current input buffer, if any.  Continue with interrupts
2205          * disabled.
2206          */
2207         disable_intr();
2208         if (com->iptr != com->ibuf)
2209                 sioinput(com);
2210
2211         /*-
2212          * Initialize critical variables, including input buffer watermarks.
2213          * The external device is asked to stop sending when the buffer
2214          * exactly reaches high water, or when the high level requests it.
2215          * The high level is notified immediately (rather than at a later
2216          * clock tick) when this watermark is reached.
2217          * The buffer size is chosen so the watermark should almost never
2218          * be reached.
2219          * The low watermark is invisibly 0 since the buffer is always
2220          * emptied all at once.
2221          */
2222         com->iptr = com->ibuf = ibuf;
2223         com->ibufend = ibuf + ibufsize;
2224         com->ierroff = ibufsize;
2225         com->ihighwater = ibuf + 3 * ibufsize / 4;
2226         return (0);
2227 }
2228
2229 static void
2230 comstart(struct tty *tp)
2231 {
2232         struct com_s    *com;
2233 #ifdef CyDebug
2234         bool_t          started;
2235 #endif
2236         int             unit;
2237
2238         unit = DEV_TO_UNIT(tp->t_dev);
2239         com = com_addr(unit);
2240         crit_enter();
2241
2242 #ifdef CyDebug
2243         ++com->start_count;
2244         started = FALSE;
2245 #endif
2246
2247         disable_intr();
2248         if (tp->t_state & TS_TTSTOP) {
2249                 com->state &= ~CS_TTGO;
2250                 if (com->intr_enable & CD1400_SRER_TXRDY)
2251                         cd_setreg(com, CD1400_SRER,
2252                                   com->intr_enable
2253                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
2254                                     | CD1400_SRER_TXMPTY);
2255         } else {
2256                 com->state |= CS_TTGO;
2257                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)
2258                     && !(com->intr_enable & CD1400_SRER_TXRDY))
2259                         cd_setreg(com, CD1400_SRER,
2260                                   com->intr_enable
2261                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
2262                                     | CD1400_SRER_TXRDY);
2263         }
2264         if (tp->t_state & TS_TBLOCK) {
2265                 if (com->mcr_image & com->mcr_rts && com->state & CS_RTS_IFLOW)
2266 #if 0
2267                         outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
2268 #else
2269                         cd_setreg(com, com->mcr_rts_reg,
2270                                   com->mcr_image &= ~com->mcr_rts);
2271 #endif
2272         } else {
2273                 if (!(com->mcr_image & com->mcr_rts)
2274                     && com->iptr < com->ihighwater
2275                     && com->state & CS_RTS_IFLOW)
2276 #if 0
2277                         outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2278 #else
2279                         cd_setreg(com, com->mcr_rts_reg,
2280                                   com->mcr_image |= com->mcr_rts);
2281 #endif
2282         }
2283         enable_intr();
2284         if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
2285                 ttwwakeup(tp);
2286                 crit_exit();
2287                 return;
2288         }
2289         if (tp->t_outq.c_cc != 0) {
2290                 struct lbq      *qp;
2291                 struct lbq      *next;
2292
2293                 if (!com->obufs[0].l_queued) {
2294 #ifdef CyDebug
2295                         started = TRUE;
2296 #endif
2297                         com->obufs[0].l_tail
2298                             = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
2299                                                   sizeof com->obuf1);
2300                         com->obufs[0].l_next = NULL;
2301                         com->obufs[0].l_queued = TRUE;
2302                         disable_intr();
2303                         if (com->state & CS_BUSY) {
2304                                 qp = com->obufq.l_next;
2305                                 while ((next = qp->l_next) != NULL)
2306                                         qp = next;
2307                                 qp->l_next = &com->obufs[0];
2308                         } else {
2309                                 com->obufq.l_head = com->obufs[0].l_head;
2310                                 com->obufq.l_tail = com->obufs[0].l_tail;
2311                                 com->obufq.l_next = &com->obufs[0];
2312                                 com->state |= CS_BUSY;
2313                                 if (com->state >= (CS_BUSY | CS_TTGO
2314                                                    | CS_ODEVREADY))
2315                                         cd_setreg(com, CD1400_SRER,
2316                                                   com->intr_enable
2317                                                   = (com->intr_enable
2318                                                     & ~CD1400_SRER_TXMPTY)
2319                                                     | CD1400_SRER_TXRDY);
2320                         }
2321                         enable_intr();
2322                 }
2323                 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
2324 #ifdef CyDebug
2325                         started = TRUE;
2326 #endif
2327                         com->obufs[1].l_tail
2328                             = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
2329                                                   sizeof com->obuf2);
2330                         com->obufs[1].l_next = NULL;
2331                         com->obufs[1].l_queued = TRUE;
2332                         disable_intr();
2333                         if (com->state & CS_BUSY) {
2334                                 qp = com->obufq.l_next;
2335                                 while ((next = qp->l_next) != NULL)
2336                                         qp = next;
2337                                 qp->l_next = &com->obufs[1];
2338                         } else {
2339                                 com->obufq.l_head = com->obufs[1].l_head;
2340                                 com->obufq.l_tail = com->obufs[1].l_tail;
2341                                 com->obufq.l_next = &com->obufs[1];
2342                                 com->state |= CS_BUSY;
2343                                 if (com->state >= (CS_BUSY | CS_TTGO
2344                                                    | CS_ODEVREADY))
2345                                         cd_setreg(com, CD1400_SRER,
2346                                                   com->intr_enable
2347                                                   = (com->intr_enable
2348                                                     & ~CD1400_SRER_TXMPTY)
2349                                                     | CD1400_SRER_TXRDY);
2350                         }
2351                         enable_intr();
2352                 }
2353                 tp->t_state |= TS_BUSY;
2354         }
2355 #ifdef CyDebug
2356         if (started)
2357                 ++com->start_real;
2358 #endif
2359 #if 0
2360         disable_intr();
2361         if (com->state >= (CS_BUSY | CS_TTGO))
2362                 siointr1(com);  /* fake interrupt to start output */
2363         enable_intr();
2364 #endif
2365         ttwwakeup(tp);
2366         crit_exit();
2367 }
2368
2369 static void
2370 comstop(struct tty *tp, int rw)
2371 {
2372         struct com_s    *com;
2373         bool_t          wakeup_etc;
2374
2375         com = com_addr(DEV_TO_UNIT(tp->t_dev));
2376         wakeup_etc = FALSE;
2377         disable_intr();
2378         if (rw & FWRITE) {
2379                 com->obufs[0].l_queued = FALSE;
2380                 com->obufs[1].l_queued = FALSE;
2381                 if (com->extra_state & CSE_ODONE) {
2382                         com_events -= LOTS_OF_EVENTS;
2383                         com->extra_state &= ~CSE_ODONE;
2384                         if (com->etc != ETC_NONE) {
2385                                 if (com->etc == ETC_BREAK_ENDED)
2386                                         com->etc = ETC_NONE;
2387                                 wakeup_etc = TRUE;
2388                         }
2389                 }
2390                 com->tp->t_state &= ~TS_BUSY;
2391                 if (com->state & CS_ODONE)
2392                         com_events -= LOTS_OF_EVENTS;
2393                 com->state &= ~(CS_ODONE | CS_BUSY);
2394         }
2395         if (rw & FREAD) {
2396                 /* XXX no way to reset only input fifo. */
2397                 com_events -= (com->iptr - com->ibuf);
2398                 com->iptr = com->ibuf;
2399         }
2400         enable_intr();
2401         if (wakeup_etc)
2402                 wakeup(&com->etc);
2403         if (rw & FWRITE && com->etc == ETC_NONE)
2404                 cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
2405         comstart(tp);
2406 }
2407
2408 static int
2409 commctl(struct com_s *com, int bits, int how)
2410 {
2411         int     mcr;
2412         int     msr;
2413
2414         if (how == DMGET) {
2415                 if (com->channel_control & CD1400_CCR_RCVEN)
2416                         bits |= TIOCM_LE;
2417                 mcr = com->mcr_image;
2418                 if (mcr & com->mcr_dtr)
2419                         bits |= TIOCM_DTR;
2420                 if (mcr & com->mcr_rts)
2421                         /* XXX wired on for Cyclom-8Ys */
2422                         bits |= TIOCM_RTS;
2423
2424                 /*
2425                  * We must read the modem status from the hardware because
2426                  * we don't generate modem status change interrupts for all
2427                  * changes, so com->prev_modem_status is not guaranteed to
2428                  * be up to date.  This is safe, unlike for sio, because
2429                  * reading the status register doesn't clear pending modem
2430                  * status change interrupts.
2431                  */
2432                 msr = cd_getreg(com, CD1400_MSVR2);
2433
2434                 if (msr & MSR_CTS)
2435                         bits |= TIOCM_CTS;
2436                 if (msr & MSR_DCD)
2437                         bits |= TIOCM_CD;
2438                 if (msr & MSR_DSR)
2439                         bits |= TIOCM_DSR;
2440                 if (msr & MSR_RI)
2441                         /* XXX not connected except for Cyclom-16Y? */
2442                         bits |= TIOCM_RI;
2443                 return (bits);
2444         }
2445         mcr = 0;
2446         if (bits & TIOCM_DTR)
2447                 mcr |= com->mcr_dtr;
2448         if (bits & TIOCM_RTS)
2449                 mcr |= com->mcr_rts;
2450         disable_intr();
2451         switch (how) {
2452         case DMSET:
2453                 com->mcr_image = mcr;
2454                 cd_setreg(com, CD1400_MSVR1, mcr);
2455                 cd_setreg(com, CD1400_MSVR2, mcr);
2456                 break;
2457         case DMBIS:
2458                 com->mcr_image = mcr = com->mcr_image | mcr;
2459                 cd_setreg(com, CD1400_MSVR1, mcr);
2460                 cd_setreg(com, CD1400_MSVR2, mcr);
2461                 break;
2462         case DMBIC:
2463                 com->mcr_image = mcr = com->mcr_image & ~mcr;
2464                 cd_setreg(com, CD1400_MSVR1, mcr);
2465                 cd_setreg(com, CD1400_MSVR2, mcr);
2466                 break;
2467         }
2468         enable_intr();
2469         return (0);
2470 }
2471
2472 static void
2473 siosettimeout(void)
2474 {
2475         struct com_s    *com;
2476         bool_t          someopen;
2477         int             unit;
2478
2479         /*
2480          * Set our timeout period to 1 second if no polled devices are open.
2481          * Otherwise set it to max(1/200, 1/hz).
2482          * Enable timeouts iff some device is open.
2483          */
2484         callout_stop(&sio_timeout_handle);
2485         sio_timeout = hz;
2486         someopen = FALSE;
2487         for (unit = 0; unit < NSIO; ++unit) {
2488                 com = com_addr(unit);
2489                 if (com != NULL && com->tp != NULL
2490                     && com->tp->t_state & TS_ISOPEN) {
2491                         someopen = TRUE;
2492 #if 0
2493                         if (com->poll || com->poll_output) {
2494                                 sio_timeout = hz > 200 ? hz / 200 : 1;
2495                                 break;
2496                         }
2497 #endif
2498                 }
2499         }
2500         if (someopen) {
2501                 sio_timeouts_until_log = hz / sio_timeout;
2502                 callout_reset(&sio_timeout_handle, sio_timeout,
2503                                 comwakeup, NULL);
2504         } else {
2505                 /* Flush error messages, if any. */
2506                 sio_timeouts_until_log = 1;
2507                 comwakeup(NULL);
2508                 callout_stop(&sio_timeout_handle);
2509         }
2510 }
2511
2512 static void
2513 comwakeup(void *chan)
2514 {
2515         struct com_s    *com;
2516         int             unit;
2517
2518         callout_reset(&sio_timeout_handle, sio_timeout, comwakeup, NULL);
2519
2520 #if 0
2521         /*
2522          * Recover from lost output interrupts.
2523          * Poll any lines that don't use interrupts.
2524          */
2525         for (unit = 0; unit < NSIO; ++unit) {
2526                 com = com_addr(unit);
2527                 if (com != NULL
2528                     && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
2529                         disable_intr();
2530                         siointr1(com);
2531                         enable_intr();
2532                 }
2533         }
2534 #endif
2535
2536         /*
2537          * Check for and log errors, but not too often.
2538          */
2539         if (--sio_timeouts_until_log > 0)
2540                 return;
2541         sio_timeouts_until_log = hz / sio_timeout;
2542         for (unit = 0; unit < NSIO; ++unit) {
2543                 int     errnum;
2544
2545                 com = com_addr(unit);
2546                 if (com == NULL)
2547                         continue;
2548                 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
2549                         u_int   delta;
2550                         u_long  total;
2551
2552                         disable_intr();
2553                         delta = com->delta_error_counts[errnum];
2554                         com->delta_error_counts[errnum] = 0;
2555                         enable_intr();
2556                         if (delta == 0)
2557                                 continue;
2558                         total = com->error_counts[errnum] += delta;
2559                         log(LOG_ERR, "cy%d: %u more %s%s (total %lu)\n",
2560                             unit, delta, error_desc[errnum],
2561                             delta == 1 ? "" : "s", total);
2562                 }
2563         }
2564 }
2565
2566 static void
2567 disc_optim(struct tty *tp, struct termios *t, struct com_s *com)
2568 {
2569 #ifndef SOFT_HOTCHAR
2570         u_char  opt;
2571 #endif
2572
2573         /*
2574          * XXX can skip a lot more cases if Smarts.  Maybe
2575          * (IGNCR | ISTRIP | IXON) in c_iflag.  But perhaps we
2576          * shouldn't skip if (TS_CNTTB | TS_LNCH) is set in t_state.
2577          */
2578         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
2579             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
2580             && (!(t->c_iflag & PARMRK)
2581                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
2582             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
2583             && linesw[tp->t_line].l_rint == ttyinput)
2584                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
2585         else
2586                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
2587         com->hotchar = linesw[tp->t_line].l_hotchar;
2588 #ifndef SOFT_HOTCHAR
2589         opt = com->cor[2] & ~CD1400_COR3_SCD34;
2590         if (com->hotchar != 0) {
2591                 cd_setreg(com, CD1400_SCHR3, com->hotchar);
2592                 cd_setreg(com, CD1400_SCHR4, com->hotchar);
2593                 opt |= CD1400_COR3_SCD34;
2594         }
2595         if (opt != com->cor[2]) {
2596                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
2597                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | CD1400_CCR_COR3);
2598         }
2599 #endif
2600 }
2601
2602 #ifdef Smarts
2603 /* standard line discipline input routine */
2604 int
2605 cyinput(int c, struct tty *tp)
2606 {
2607         /* XXX duplicate ttyinput(), but without the IXOFF/IXON/ISTRIP/IPARMRK
2608          * bits, as they are done by the CD1400.  Hardly worth the effort,
2609          * given that high-throughput sessions are raw anyhow.
2610          */
2611 }
2612 #endif /* Smarts */
2613
2614 static int
2615 comspeed(speed_t speed, u_long cy_clock, int *prescaler_io)
2616 {
2617         int     actual;
2618         int     error;
2619         int     divider;
2620         int     prescaler;
2621         int     prescaler_unit;
2622
2623         if (speed == 0)
2624                 return (0);
2625         if (speed < 0 || speed > 150000)
2626                 return (-1);
2627
2628         /* determine which prescaler to use */
2629         for (prescaler_unit = 4, prescaler = 2048; prescaler_unit;
2630                 prescaler_unit--, prescaler >>= 2) {
2631                 if (cy_clock / prescaler / speed > 63)
2632                         break;
2633         }
2634
2635         divider = (cy_clock / prescaler * 2 / speed + 1) / 2; /* round off */
2636         if (divider > 255)
2637                 divider = 255;
2638         actual = cy_clock/prescaler/divider;
2639
2640         /* 10 times error in percent: */
2641         error = ((actual - (long)speed) * 2000 / (long)speed + 1) / 2;
2642
2643         /* 3.0% max error tolerance */
2644         if (error < -30 || error > 30)
2645                 return (-1);
2646
2647 #if 0
2648         kprintf("prescaler = %d (%d)\n", prescaler, prescaler_unit);
2649         kprintf("divider = %d (%x)\n", divider, divider);
2650         kprintf("actual = %d\n", actual);
2651         kprintf("error = %d\n", error);
2652 #endif
2653
2654         *prescaler_io = prescaler_unit;
2655         return (divider);
2656 }
2657
2658 static void
2659 cd1400_channel_cmd(struct com_s *com, int cmd)
2660 {
2661         cd1400_channel_cmd_wait(com);
2662         cd_setreg(com, CD1400_CCR, cmd);
2663         cd1400_channel_cmd_wait(com);
2664 }
2665
2666 static void
2667 cd1400_channel_cmd_wait(struct com_s *com)
2668 {
2669         struct timeval  start;
2670         struct timeval  tv;
2671         long            usec;
2672
2673         if (cd_getreg(com, CD1400_CCR) == 0)
2674                 return;
2675         microtime(&start);
2676         for (;;) {
2677                 if (cd_getreg(com, CD1400_CCR) == 0)
2678                         return;
2679                 microtime(&tv);
2680                 usec = 1000000 * (tv.tv_sec - start.tv_sec) +
2681                     tv.tv_usec - start.tv_usec;
2682                 if (usec >= 5000) {
2683                         log(LOG_ERR,
2684                             "cy%d: channel command timeout (%ld usec)\n",
2685                             com->unit, usec);
2686                         return;
2687                 }
2688         }
2689 }
2690
2691 static void
2692 cd_etc(struct com_s *com, int etc)
2693 {
2694         /*
2695          * We can't change the hardware's ETC state while there are any
2696          * characters in the tx fifo, since those characters would be
2697          * interpreted as commands!  Unputting characters from the fifo
2698          * is difficult, so we wait up to 12 character times for the fifo
2699          * to drain.  The command will be delayed for up to 2 character
2700          * times for the tx to become empty.  Unputting characters from
2701          * the tx holding and shift registers is impossible, so we wait
2702          * for the tx to become empty so that the command is sure to be
2703          * executed soon after we issue it.
2704          */
2705         disable_intr();
2706         if (com->etc == etc) {
2707                 enable_intr();
2708                 goto wait;
2709         }
2710         if ((etc == CD1400_ETC_SENDBREAK
2711             && (com->etc == ETC_BREAK_STARTING
2712                 || com->etc == ETC_BREAK_STARTED))
2713             || (etc == CD1400_ETC_STOPBREAK
2714                && (com->etc == ETC_BREAK_ENDING || com->etc == ETC_BREAK_ENDED
2715                    || com->etc == ETC_NONE))) {
2716                 enable_intr();
2717                 return;
2718         }
2719         com->etc = etc;
2720         cd_setreg(com, CD1400_SRER,
2721                   com->intr_enable
2722                   = (com->intr_enable & ~CD1400_SRER_TXRDY) | CD1400_SRER_TXMPTY);
2723         enable_intr();
2724 wait:
2725         while (com->etc == etc
2726                && tsleep(&com->etc, PCATCH, "cyetc", 0) == 0)
2727                 continue;
2728 }
2729
2730 static int
2731 cd_getreg(struct com_s *com, int reg)
2732 {
2733         struct com_s    *basecom;
2734         u_char  car;
2735         int     cy_align;
2736         u_long  ef;
2737         cy_addr iobase;
2738         int     val;
2739
2740         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
2741         car = com->unit & CD1400_CAR_CHAN;
2742         cy_align = com->cy_align;
2743         iobase = com->iobase;
2744         ef = read_eflags();
2745         if (ef & PSL_I)
2746                 disable_intr();
2747         if (basecom->car != car)
2748                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
2749         val = cd_inb(iobase, reg, cy_align);
2750         if (ef & PSL_I)
2751                 enable_intr();
2752         return (val);
2753 }
2754
2755 static void
2756 cd_setreg(struct com_s *com, int reg, int val)
2757 {
2758         struct com_s    *basecom;
2759         u_char  car;
2760         int     cy_align;
2761         u_long  ef;
2762         cy_addr iobase;
2763
2764         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
2765         car = com->unit & CD1400_CAR_CHAN;
2766         cy_align = com->cy_align;
2767         iobase = com->iobase;
2768         ef = read_eflags();
2769         if (ef & PSL_I)
2770                 disable_intr();
2771         if (basecom->car != car)
2772                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
2773         cd_outb(iobase, reg, cy_align, val);
2774         if (ef & PSL_I)
2775                 enable_intr();
2776 }
2777
2778 #ifdef CyDebug
2779 /* useful in ddb */
2780 void
2781 cystatus(int unit)
2782 {
2783         struct com_s    *com;
2784         cy_addr         iobase;
2785         u_int           ocount;
2786         struct tty      *tp;
2787
2788         com = com_addr(unit);
2789         kprintf("info for channel %d\n", unit);
2790         kprintf("------------------\n");
2791         kprintf("total cyclom service probes:\t%d\n", cy_svrr_probes);
2792         kprintf("calls to upper layer:\t\t%d\n", cy_timeouts);
2793         if (com == NULL)
2794                 return;
2795         iobase = com->iobase;
2796         kprintf("\n");
2797         kprintf("cd1400 base address:\\tt%p\n", iobase);
2798         kprintf("saved channel_control:\t\t0x%02x\n", com->channel_control);
2799         kprintf("saved cor1-3:\t\t\t0x%02x 0x%02x 0x%02x\n",
2800                com->cor[0], com->cor[1], com->cor[2]);
2801         kprintf("service request enable reg:\t0x%02x (0x%02x cached)\n",
2802                cd_getreg(com, CD1400_SRER), com->intr_enable);
2803         kprintf("service request register:\t0x%02x\n",
2804                cd_inb(iobase, CD1400_SVRR, com->cy_align));
2805         kprintf("modem status:\t\t\t0x%02x (0x%02x cached)\n",
2806                cd_getreg(com, CD1400_MSVR2), com->prev_modem_status);
2807         kprintf("rx/tx/mdm interrupt registers:\t0x%02x 0x%02x 0x%02x\n",
2808                cd_inb(iobase, CD1400_RIR, com->cy_align),
2809                cd_inb(iobase, CD1400_TIR, com->cy_align),
2810                cd_inb(iobase, CD1400_MIR, com->cy_align));
2811         kprintf("\n");
2812         kprintf("com state:\t\t\t0x%02x\n", com->state);
2813         kprintf("calls to comstart():\t\t%d (%d useful)\n",
2814                com->start_count, com->start_real);
2815         kprintf("rx buffer chars free:\t\t%d\n", com->iptr - com->ibuf);
2816         ocount = 0;
2817         if (com->obufs[0].l_queued)
2818                 ocount += com->obufs[0].l_tail - com->obufs[0].l_head;
2819         if (com->obufs[1].l_queued)
2820                 ocount += com->obufs[1].l_tail - com->obufs[1].l_head;
2821         kprintf("tx buffer chars:\t\t%u\n", ocount);
2822         kprintf("received chars:\t\t\t%d\n", com->bytes_in);
2823         kprintf("received exceptions:\t\t%d\n", com->recv_exception);
2824         kprintf("modem signal deltas:\t\t%d\n", com->mdm);
2825         kprintf("transmitted chars:\t\t%d\n", com->bytes_out);
2826         kprintf("\n");
2827         tp = com->tp;
2828         if (tp != NULL) {
2829                 kprintf("tty state:\t\t\t0x%08x\n", tp->t_state);
2830                 kprintf(
2831                 "upper layer queue lengths:\t%d raw, %d canon, %d output\n",
2832                        tp->t_rawq.c_cc, tp->t_canq.c_cc, tp->t_outq.c_cc);
2833         } else
2834                 kprintf("tty state:\t\t\tclosed\n");
2835 }
2836 #endif /* CyDebug */