The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/cy.c

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    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: releng/5.0/sys/i386/isa/cy.c 93593 2002-04-01 21:31:13Z jhb $
   31  */
   32 
   33 #include "opt_compat.h"
   34 #include "cy.h"
   35 
   36 /*
   37  * TODO:
   38  * Atomic COR change.
   39  * Consoles.
   40  */
   41 
   42 /*
   43  * Temporary compile-time configuration options.
   44  */
   45 #define RxFifoThreshold (CD1400_RX_FIFO_SIZE / 2)
   46                         /* Number of chars in the receiver FIFO before an
   47                          * an interrupt is generated.  Should depend on
   48                          * line speed.  Needs to be about 6 on a 486DX33
   49                          * for 4 active ports at 115200 bps.  Why doesn't
   50                          * 10 work?
   51                          */
   52 #define PollMode        /* Use polling-based irq service routine, not the
   53                          * hardware svcack lines.  Must be defined for
   54                          * Cyclom-16Y boards.  Less efficient for Cyclom-8Ys,
   55                          * and stops 4 * 115200 bps from working.
   56                          */
   57 #undef  Smarts          /* Enable slightly more CD1400 intelligence.  Mainly
   58                          * the output CR/LF processing, plus we can avoid a
   59                          * few checks usually done in ttyinput().
   60                          *
   61                          * XXX not fully implemented, and not particularly
   62                          * worthwhile.
   63                          */
   64 #undef  CyDebug         /* Include debugging code (not very expensive). */
   65 
   66 /* These will go away. */
   67 #undef  SOFT_CTS_OFLOW
   68 #define SOFT_HOTCHAR
   69 
   70 #include <sys/param.h>
   71 #include <sys/systm.h>
   72 #include <sys/bus.h>
   73 #include <sys/conf.h>
   74 #include <sys/dkstat.h>
   75 #include <sys/fcntl.h>
   76 #include <sys/interrupt.h>
   77 #include <sys/kernel.h>
   78 #include <sys/lock.h>
   79 #include <sys/malloc.h>
   80 #include <sys/mutex.h>
   81 #include <sys/syslog.h>
   82 #include <sys/tty.h>
   83 
   84 #include <machine/psl.h>
   85 
   86 #include <i386/isa/isa_device.h>
   87 #include <i386/isa/cyreg.h>
   88 #include <i386/isa/ic/cd1400.h>
   89 
   90 #ifndef COMPAT_OLDISA
   91 #error "The cy device requires the old isa compatibility shims"
   92 #endif
   93 
   94 #ifdef SMP
   95 
   96 #include <machine/smptests.h>                   /** xxx_LOCK */
   97 
   98 #ifdef USE_COMLOCK
   99 #define COM_LOCK()      mtx_lock_spin(&com_mtx)
  100 #define COM_UNLOCK()    mtx_unlock_spin(&com_mtx)
  101 #else
  102 #define COM_LOCK()
  103 #define COM_UNLOCK()
  104 #endif /* USE_COMLOCK */
  105 
  106 #else /* SMP */
  107 
  108 #define COM_LOCK()
  109 #define COM_UNLOCK()
  110 
  111 #endif /* SMP */
  112 
  113 extern struct mtx       com_mtx;
  114 
  115 /*
  116  * Dictionary so that I can name everything *sio* or *com* to compare with
  117  * sio.c.  There is also lots of ugly formatting and unnecessary ifdefs to
  118  * simplify the comparision.  These will go away.
  119  */
  120 #define LSR_BI          CD1400_RDSR_BREAK
  121 #define LSR_FE          CD1400_RDSR_FE
  122 #define LSR_OE          CD1400_RDSR_OE
  123 #define LSR_PE          CD1400_RDSR_PE
  124 #define MCR_DTR         CD1400_MSVR2_DTR
  125 #define MCR_RTS         CD1400_MSVR1_RTS
  126 #define MSR_CTS         CD1400_MSVR2_CTS
  127 #define MSR_DCD         CD1400_MSVR2_CD
  128 #define MSR_DSR         CD1400_MSVR2_DSR
  129 #define MSR_RI          CD1400_MSVR2_RI
  130 #define NSIO            (NCY * CY_MAX_PORTS)
  131 #define comconsole      cyconsole
  132 #define comdefaultrate  cydefaultrate
  133 #define com_events      cy_events
  134 #define comhardclose    cyhardclose
  135 #define commctl         cymctl
  136 #define comparam        cyparam
  137 #define comspeed        cyspeed
  138 #define comstart        cystart
  139 #define comwakeup       cywakeup
  140 #define p_com_addr      p_cy_addr
  141 #define sioattach       cyattach
  142 #define sioclose        cyclose
  143 #define siodriver       cydriver
  144 #define siodtrwakeup    cydtrwakeup
  145 #define sioinput        cyinput
  146 #define siointr         cyintr
  147 #define siointr1        cyintr1
  148 #define sioioctl        cyioctl
  149 #define sioopen         cyopen
  150 #define siopoll         cypoll
  151 #define sioprobe        cyprobe
  152 #define siosettimeout   cysettimeout
  153 #define siosetwater     cysetwater
  154 #define comstop         cystop
  155 #define siowrite        cywrite
  156 #define sio_ih          cy_ih
  157 #define sio_irec        cy_irec
  158 #define sio_timeout     cy_timeout
  159 #define sio_timeout_handle cy_timeout_handle
  160 #define sio_timeouts_until_log  cy_timeouts_until_log
  161 
  162 #define CY_MAX_PORTS            (CD1400_NO_OF_CHANNELS * CY_MAX_CD1400s)
  163 
  164 /* We encode the cyclom unit number (cyu) in spare bits in the IVR's. */
  165 #define CD1400_xIVR_CHAN_SHIFT  3
  166 #define CD1400_xIVR_CHAN        0x1F
  167 
  168 /*
  169  * ETC states.  com->etc may also contain a hardware ETC command value,
  170  * meaning that execution of that command is pending.
  171  */
  172 #define ETC_NONE                0       /* we depend on bzero() setting this */
  173 #define ETC_BREAK_STARTING      1
  174 #define ETC_BREAK_STARTED       2
  175 #define ETC_BREAK_ENDING        3
  176 #define ETC_BREAK_ENDED         4
  177 
  178 #define LOTS_OF_EVENTS  64      /* helps separate urgent events from input */
  179 
  180 #define CALLOUT_MASK            0x80
  181 #define CONTROL_MASK            0x60
  182 #define CONTROL_INIT_STATE      0x20
  183 #define CONTROL_LOCK_STATE      0x40
  184 #define DEV_TO_UNIT(dev)        (MINOR_TO_UNIT(minor(dev)))
  185 #define MINOR_MAGIC_MASK        (CALLOUT_MASK | CONTROL_MASK)
  186 /*
  187  * Not all of the magic is parametrized in the following macros.  16 and
  188  * 0xff are related to the bitfields in a udev_t.  CY_MAX_PORTS must be
  189  * ((0xff & ~MINOR_MAGIC_MASK) + 1) for things to work.
  190  */
  191 #define MINOR_TO_UNIT(mynor)    (((mynor) >> 16) * CY_MAX_PORTS \
  192                                  | (((mynor) & 0xff) & ~MINOR_MAGIC_MASK))
  193 #define UNIT_TO_MINOR(unit)     (((unit) / CY_MAX_PORTS) << 16 \
  194                                  | (((unit) & 0xff) & ~MINOR_MAGIC_MASK))
  195 
  196 /*
  197  * com state bits.
  198  * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
  199  * than the other bits so that they can be tested as a group without masking
  200  * off the low bits.
  201  *
  202  * The following com and tty flags correspond closely:
  203  *      CS_BUSY         = TS_BUSY (maintained by comstart(), siopoll() and
  204  *                                 comstop())
  205  *      CS_TTGO         = ~TS_TTSTOP (maintained by comparam() and comstart())
  206  *      CS_CTS_OFLOW    = CCTS_OFLOW (maintained by comparam())
  207  *      CS_RTS_IFLOW    = CRTS_IFLOW (maintained by comparam())
  208  * TS_FLUSH is not used.
  209  * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
  210  * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
  211  */
  212 #define CS_BUSY         0x80    /* output in progress */
  213 #define CS_TTGO         0x40    /* output not stopped by XOFF */
  214 #define CS_ODEVREADY    0x20    /* external device h/w ready (CTS) */
  215 #define CS_CHECKMSR     1       /* check of MSR scheduled */
  216 #define CS_CTS_OFLOW    2       /* use CTS output flow control */
  217 #define CS_DTR_OFF      0x10    /* DTR held off */
  218 #define CS_ODONE        4       /* output completed */
  219 #define CS_RTS_IFLOW    8       /* use RTS input flow control */
  220 #define CSE_ODONE       1       /* output transmitted */
  221 
  222 static  char const * const      error_desc[] = {
  223 #define CE_OVERRUN                      0
  224         "silo overflow",
  225 #define CE_INTERRUPT_BUF_OVERFLOW       1
  226         "interrupt-level buffer overflow",
  227 #define CE_TTY_BUF_OVERFLOW             2
  228         "tty-level buffer overflow",
  229 };
  230 
  231 #define CE_NTYPES                       3
  232 #define CE_RECORD(com, errnum)          (++(com)->delta_error_counts[errnum])
  233 
  234 /* types.  XXX - should be elsewhere */
  235 typedef u_char  bool_t;         /* boolean */
  236 typedef u_char volatile *cy_addr;
  237 
  238 /* queue of linear buffers */
  239 struct lbq {
  240         u_char  *l_head;        /* next char to process */
  241         u_char  *l_tail;        /* one past the last char to process */
  242         struct lbq *l_next;     /* next in queue */
  243         bool_t  l_queued;       /* nonzero if queued */
  244 };
  245 
  246 /* com device structure */
  247 struct com_s {
  248         u_char  state;          /* miscellaneous flag bits */
  249         bool_t  active_out;     /* nonzero if the callout device is open */
  250 #if 0
  251         u_char  cfcr_image;     /* copy of value written to CFCR */
  252 #endif
  253         u_char  etc;            /* pending Embedded Transmit Command */
  254         u_char  extra_state;    /* more flag bits, separate for order trick */
  255 #if 0
  256         u_char  fifo_image;     /* copy of value written to FIFO */
  257 #endif
  258         u_char  gfrcr_image;    /* copy of value read from GFRCR */
  259 #if 0
  260         bool_t  hasfifo;        /* nonzero for 16550 UARTs */
  261         bool_t  loses_outints;  /* nonzero if device loses output interrupts */
  262 #endif
  263         u_char  mcr_dtr;        /* MCR bit that is wired to DTR */
  264         u_char  mcr_image;      /* copy of value written to MCR */
  265         u_char  mcr_rts;        /* MCR bit that is wired to RTS */
  266 #if 0
  267 #ifdef COM_MULTIPORT
  268         bool_t  multiport;      /* is this unit part of a multiport device? */
  269 #endif /* COM_MULTIPORT */
  270         bool_t  no_irq;         /* nonzero if irq is not attached */
  271         bool_t  poll;           /* nonzero if polling is required */
  272         bool_t  poll_output;    /* nonzero if polling for output is required */
  273 #endif
  274         int     unit;           /* unit number */
  275         int     dtr_wait;       /* time to hold DTR down on close (* 1/hz) */
  276 #if 0
  277         u_int   tx_fifo_size;
  278 #endif
  279         u_int   wopeners;       /* # processes waiting for DCD in open() */
  280 
  281         /*
  282          * The high level of the driver never reads status registers directly
  283          * because there would be too many side effects to handle conveniently.
  284          * Instead, it reads copies of the registers stored here by the
  285          * interrupt handler.
  286          */
  287         u_char  last_modem_status;      /* last MSR read by intr handler */
  288         u_char  prev_modem_status;      /* last MSR handled by high level */
  289 
  290         u_char  hotchar;        /* ldisc-specific char to be handled ASAP */
  291         u_char  *ibuf;          /* start of input buffer */
  292         u_char  *ibufend;       /* end of input buffer */
  293         u_char  *ibufold;       /* old input buffer, to be freed */
  294         u_char  *ihighwater;    /* threshold in input buffer */
  295         u_char  *iptr;          /* next free spot in input buffer */
  296         int     ibufsize;       /* size of ibuf (not include error bytes) */
  297         int     ierroff;        /* offset of error bytes in ibuf */
  298 
  299         struct lbq      obufq;  /* head of queue of output buffers */
  300         struct lbq      obufs[2];       /* output buffers */
  301 
  302         int     cy_align;       /* index for register alignment */
  303         cy_addr cy_iobase;      /* base address of this port's cyclom */
  304         cy_addr iobase;         /* base address of this port's cd1400 */
  305         int     mcr_rts_reg;    /* cd1400 reg number of reg holding mcr_rts */
  306 
  307         struct tty      *tp;    /* cross reference */
  308 
  309         /* Initial state. */
  310         struct termios  it_in;  /* should be in struct tty */
  311         struct termios  it_out;
  312 
  313         /* Lock state. */
  314         struct termios  lt_in;  /* should be in struct tty */
  315         struct termios  lt_out;
  316 
  317         bool_t  do_timestamp;
  318         bool_t  do_dcd_timestamp;
  319         struct timeval  timestamp;
  320         struct timeval  dcd_timestamp;
  321 
  322         u_long  bytes_in;       /* statistics */
  323         u_long  bytes_out;
  324         u_int   delta_error_counts[CE_NTYPES];
  325         u_long  error_counts[CE_NTYPES];
  326 
  327         u_int   recv_exception; /* exception chars received */
  328         u_int   mdm;            /* modem signal changes */
  329 #ifdef CyDebug
  330         u_int   start_count;    /* no. of calls to comstart() */
  331         u_int   start_real;     /* no. of calls that did something */
  332 #endif
  333         u_char  car;            /* CD1400 CAR shadow (if first unit in cd) */
  334         u_char  channel_control;/* CD1400 CCR control command shadow */
  335         u_char  cor[3];         /* CD1400 COR1-3 shadows */
  336         u_char  intr_enable;    /* CD1400 SRER shadow */
  337 
  338         /*
  339          * Data area for output buffers.  Someday we should build the output
  340          * buffer queue without copying data.
  341          */
  342         u_char  obuf1[256];
  343         u_char  obuf2[256];
  344 };
  345 
  346 /* PCI driver entry point. */
  347 int     cyattach_common(cy_addr cy_iobase, int cy_align);
  348 ointhand2_t     siointr;
  349 
  350 static  int     cy_units(cy_addr cy_iobase, int cy_align);
  351 static  int     sioattach(struct isa_device *dev);
  352 static  void    cd1400_channel_cmd(struct com_s *com, int cmd);
  353 static  void    cd1400_channel_cmd_wait(struct com_s *com);
  354 static  void    cd_etc(struct com_s *com, int etc);
  355 static  int     cd_getreg(struct com_s *com, int reg);
  356 static  void    cd_setreg(struct com_s *com, int reg, int val);
  357 static  timeout_t siodtrwakeup;
  358 static  void    comhardclose(struct com_s *com);
  359 static  void    sioinput(struct com_s *com);
  360 #if 0
  361 static  void    siointr1(struct com_s *com);
  362 #endif
  363 static  int     commctl(struct com_s *com, int bits, int how);
  364 static  int     comparam(struct tty *tp, struct termios *t);
  365 static  void    siopoll(void *arg);
  366 static  int     sioprobe(struct isa_device *dev);
  367 static  void    siosettimeout(void);
  368 static  int     siosetwater(struct com_s *com, speed_t speed);
  369 static  int     comspeed(speed_t speed, u_long cy_clock, int *prescaler_io);
  370 static  void    comstart(struct tty *tp);
  371 static  void    comstop(struct tty *tp, int rw);
  372 static  timeout_t comwakeup;
  373 static  void    disc_optim(struct tty *tp, struct termios *t,
  374                     struct com_s *com);
  375 
  376 #ifdef CyDebug
  377 void    cystatus(int unit);
  378 #endif
  379 
  380 static char driver_name[] = "cy";
  381 
  382 /* table and macro for fast conversion from a unit number to its com struct */
  383 static  struct com_s    *p_com_addr[NSIO];
  384 #define com_addr(unit)  (p_com_addr[unit])
  385 
  386 struct isa_driver       siodriver = {
  387         INTR_TYPE_TTY | INTR_FAST,
  388         sioprobe,
  389         sioattach,
  390         driver_name
  391 };
  392 COMPAT_ISA_DRIVER(cy, cydriver);        /* XXX */
  393 
  394 static  d_open_t        sioopen;
  395 static  d_close_t       sioclose;
  396 static  d_write_t       siowrite;
  397 static  d_ioctl_t       sioioctl;
  398 
  399 #define CDEV_MAJOR      48
  400 static struct cdevsw sio_cdevsw = {
  401         /* open */      sioopen,
  402         /* close */     sioclose,
  403         /* read */      ttyread,
  404         /* write */     siowrite,
  405         /* ioctl */     sioioctl,
  406         /* poll */      ttypoll,
  407         /* mmap */      nommap,
  408         /* strategy */  nostrategy,
  409         /* name */      driver_name,
  410         /* maj */       CDEV_MAJOR,
  411         /* dump */      nodump,
  412         /* psize */     nopsize,
  413         /* flags */     D_TTY | D_KQFILTER,
  414         /* kqfilter */  ttykqfilter,
  415 };
  416 
  417 static  int     comconsole = -1;
  418 static  speed_t comdefaultrate = TTYDEF_SPEED;
  419 static  u_int   com_events;     /* input chars + weighted output completions */
  420 static  void    *sio_ih;
  421 static  int     sio_timeout;
  422 static  int     sio_timeouts_until_log;
  423 static  struct  callout_handle sio_timeout_handle
  424     = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle);
  425 
  426 #ifdef CyDebug
  427 static  u_int   cd_inbs;
  428 static  u_int   cy_inbs;
  429 static  u_int   cd_outbs;
  430 static  u_int   cy_outbs;
  431 static  u_int   cy_svrr_probes;
  432 static  u_int   cy_timeouts;
  433 #endif
  434 
  435 static  int     cy_chip_offset[] = {
  436         0x0000, 0x0400, 0x0800, 0x0c00, 0x0200, 0x0600, 0x0a00, 0x0e00,
  437 };
  438 static  int     cy_nr_cd1400s[NCY];
  439 static  int     cy_total_devices;
  440 #undef  RxFifoThreshold
  441 static  int     volatile RxFifoThreshold = (CD1400_RX_FIFO_SIZE / 2);
  442 
  443 static int
  444 sioprobe(dev)
  445         struct isa_device       *dev;
  446 {
  447         cy_addr iobase;
  448 
  449         iobase = (cy_addr)dev->id_maddr;
  450 
  451         /* Cyclom-16Y hardware reset (Cyclom-8Ys don't care) */
  452         cy_inb(iobase, CY16_RESET, 0);  /* XXX? */
  453         DELAY(500);     /* wait for the board to get its act together */
  454 
  455         /* this is needed to get the board out of reset */
  456         cy_outb(iobase, CY_CLEAR_INTR, 0, 0);
  457         DELAY(500);
  458 
  459         return (cy_units(iobase, 0) == 0 ? 0 : -1);
  460 }
  461 
  462 static int
  463 cy_units(cy_iobase, cy_align)
  464         cy_addr cy_iobase;
  465         int     cy_align;
  466 {
  467         int     cyu;
  468         u_char  firmware_version;
  469         int     i;
  470         cy_addr iobase;
  471 
  472         for (cyu = 0; cyu < CY_MAX_CD1400s; ++cyu) {
  473                 iobase = cy_iobase + (cy_chip_offset[cyu] << cy_align);
  474 
  475                 /* wait for chip to become ready for new command */
  476                 for (i = 0; i < 10; i++) {
  477                         DELAY(50);
  478                         if (!cd_inb(iobase, CD1400_CCR, cy_align))
  479                                 break;
  480                 }
  481 
  482                 /* clear the GFRCR register */
  483                 cd_outb(iobase, CD1400_GFRCR, cy_align, 0);
  484 
  485                 /* issue a reset command */
  486                 cd_outb(iobase, CD1400_CCR, cy_align,
  487                         CD1400_CCR_CMDRESET | CD1400_CCR_FULLRESET);
  488 
  489                 /* XXX bogus initialization to avoid a gcc bug/warning. */
  490                 firmware_version = 0;
  491 
  492                 /* wait for the CD1400 to initialize itself */
  493                 for (i = 0; i < 200; i++) {
  494                         DELAY(50);
  495 
  496                         /* retrieve firmware version */
  497                         firmware_version = cd_inb(iobase, CD1400_GFRCR,
  498                                                   cy_align);
  499                         if ((firmware_version & 0xf0) == 0x40)
  500                                 break;
  501                 }
  502 
  503                 /*
  504                  * Anything in the 0x40-0x4F range is fine.
  505                  * If one CD1400 is bad then we don't support higher
  506                  * numbered good ones on this board.
  507                  */
  508                 if ((firmware_version & 0xf0) != 0x40)
  509                         break;
  510         }
  511         return (cyu);
  512 }
  513 
  514 static int
  515 sioattach(isdp)
  516         struct isa_device       *isdp;
  517 {
  518         int     adapter;
  519 
  520         adapter = cyattach_common((cy_addr) isdp->id_maddr, 0);
  521         if (adapter < 0)
  522                 return (0);
  523 
  524         /*
  525          * XXX
  526          * This kludge is to allow ISA/PCI device specifications in the
  527          * kernel config file to be in any order.
  528          */
  529         if (isdp->id_unit != adapter) {
  530                 printf("cy%d: attached as cy%d\n", isdp->id_unit, adapter);
  531                 isdp->id_unit = adapter;        /* XXX */
  532         }
  533         isdp->id_ointr = siointr;
  534         /* isdp->id_ri_flags |= RI_FAST; XXX unimplemented - use newbus! */
  535         return (1);
  536 }
  537 
  538 int
  539 cyattach_common(cy_iobase, cy_align)
  540         cy_addr cy_iobase;
  541         int     cy_align;
  542 {
  543         int     adapter;
  544         int     cyu;
  545         u_char  firmware_version;
  546         cy_addr iobase;
  547         int     minorbase;
  548         int     ncyu;
  549         int     unit;
  550 
  551         adapter = cy_total_devices;
  552         if ((u_int)adapter >= NCY) {
  553                 printf(
  554         "cy%d: can't attach adapter: insufficient cy devices configured\n",
  555                        adapter);
  556                 return (-1);
  557         }
  558         ncyu = cy_units(cy_iobase, cy_align);
  559         if (ncyu == 0)
  560                 return (-1);
  561         cy_nr_cd1400s[adapter] = ncyu;
  562         cy_total_devices++;
  563 
  564         unit = adapter * CY_MAX_PORTS;
  565         for (cyu = 0; cyu < ncyu; ++cyu) {
  566                 int     cdu;
  567 
  568                 iobase = (cy_addr) (cy_iobase
  569                                     + (cy_chip_offset[cyu] << cy_align));
  570                 firmware_version = cd_inb(iobase, CD1400_GFRCR, cy_align);
  571 
  572                 /* Set up a receive timeout period of than 1+ ms. */
  573                 cd_outb(iobase, CD1400_PPR, cy_align,
  574                         howmany(CY_CLOCK(firmware_version)
  575                                 / CD1400_PPR_PRESCALER, 1000));
  576 
  577                 for (cdu = 0; cdu < CD1400_NO_OF_CHANNELS; ++cdu, ++unit) {
  578                         struct com_s    *com;
  579                         int             s;
  580 
  581         com = malloc(sizeof *com, M_DEVBUF, M_NOWAIT | M_ZERO);
  582         if (com == NULL)
  583                 break;
  584         com->unit = unit;
  585                         com->gfrcr_image = firmware_version;
  586                         if (CY_RTS_DTR_SWAPPED(firmware_version)) {
  587                                 com->mcr_dtr = MCR_RTS;
  588                                 com->mcr_rts = MCR_DTR;
  589                                 com->mcr_rts_reg = CD1400_MSVR2;
  590                         } else {
  591                                 com->mcr_dtr = MCR_DTR;
  592                                 com->mcr_rts = MCR_RTS;
  593                                 com->mcr_rts_reg = CD1400_MSVR1;
  594                         }
  595         com->dtr_wait = 3 * hz;
  596         com->obufs[0].l_head = com->obuf1;
  597         com->obufs[1].l_head = com->obuf2;
  598 
  599                         com->cy_align = cy_align;
  600                         com->cy_iobase = cy_iobase;
  601         com->iobase = iobase;
  602                         com->car = ~CD1400_CAR_CHAN;
  603 
  604         /*
  605          * We don't use all the flags from <sys/ttydefaults.h> since they
  606          * are only relevant for logins.  It's important to have echo off
  607          * initially so that the line doesn't start blathering before the
  608          * echo flag can be turned off.
  609          */
  610         com->it_in.c_iflag = 0;
  611         com->it_in.c_oflag = 0;
  612         com->it_in.c_cflag = TTYDEF_CFLAG;
  613         com->it_in.c_lflag = 0;
  614         if (unit == comconsole) {
  615                 com->it_in.c_iflag = TTYDEF_IFLAG;
  616                 com->it_in.c_oflag = TTYDEF_OFLAG;
  617                 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
  618                 com->it_in.c_lflag = TTYDEF_LFLAG;
  619                 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL;
  620         }
  621         if (siosetwater(com, com->it_in.c_ispeed) != 0) {
  622                 free(com, M_DEVBUF);
  623                 return (0);
  624         }
  625         termioschars(&com->it_in);
  626         com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
  627         com->it_out = com->it_in;
  628 
  629         s = spltty();
  630         com_addr(unit) = com;
  631         splx(s);
  632 
  633         if (sio_ih == NULL) {
  634                 swi_add(&tty_ithd, "tty:cy", siopoll, NULL, SWI_TTY, 0,
  635                     &sio_ih);
  636         }
  637         minorbase = UNIT_TO_MINOR(unit);
  638         make_dev(&sio_cdevsw, minorbase,
  639                 UID_ROOT, GID_WHEEL, 0600, "ttyc%r%r", adapter,
  640                 unit % CY_MAX_PORTS);
  641         make_dev(&sio_cdevsw, minorbase | CONTROL_INIT_STATE,
  642                 UID_ROOT, GID_WHEEL, 0600, "ttyic%r%r", adapter,
  643                 unit % CY_MAX_PORTS);
  644         make_dev(&sio_cdevsw, minorbase | CONTROL_LOCK_STATE,
  645                 UID_ROOT, GID_WHEEL, 0600, "ttylc%r%r", adapter,
  646                 unit % CY_MAX_PORTS);
  647         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK,
  648                 UID_UUCP, GID_DIALER, 0660, "cuac%r%r", adapter,
  649                 unit % CY_MAX_PORTS);
  650         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_INIT_STATE,
  651                 UID_UUCP, GID_DIALER, 0660, "cuaic%r%r", adapter,
  652                 unit % CY_MAX_PORTS);
  653         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE,
  654                 UID_UUCP, GID_DIALER, 0660, "cualc%r%r", adapter,
  655                 unit % CY_MAX_PORTS);
  656                 }
  657         }
  658 
  659         /* ensure an edge for the next interrupt */
  660         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
  661 
  662         return (adapter);
  663 }
  664 
  665 static int
  666 sioopen(dev, flag, mode, td)
  667         dev_t           dev;
  668         int             flag;
  669         int             mode;
  670         struct thread   *td;
  671 {
  672         struct com_s    *com;
  673         int             error;
  674         int             mynor;
  675         int             s;
  676         struct tty      *tp;
  677         int             unit;
  678 
  679         mynor = minor(dev);
  680         unit = MINOR_TO_UNIT(mynor);
  681         if ((u_int) unit >= NSIO || (com = com_addr(unit)) == NULL)
  682                 return (ENXIO);
  683         if (mynor & CONTROL_MASK)
  684                 return (0);
  685         tp = dev->si_tty = com->tp = ttymalloc(com->tp);
  686         s = spltty();
  687         /*
  688          * We jump to this label after all non-interrupted sleeps to pick
  689          * up any changes of the device state.
  690          */
  691 open_top:
  692         while (com->state & CS_DTR_OFF) {
  693                 error = tsleep(&com->dtr_wait, TTIPRI | PCATCH, "cydtr", 0);
  694                 if (error != 0)
  695                         goto out;
  696         }
  697         if (tp->t_state & TS_ISOPEN) {
  698                 /*
  699                  * The device is open, so everything has been initialized.
  700                  * Handle conflicts.
  701                  */
  702                 if (mynor & CALLOUT_MASK) {
  703                         if (!com->active_out) {
  704                                 error = EBUSY;
  705                                 goto out;
  706                         }
  707                 } else {
  708                         if (com->active_out) {
  709                                 if (flag & O_NONBLOCK) {
  710                                         error = EBUSY;
  711                                         goto out;
  712                                 }
  713                                 error = tsleep(&com->active_out,
  714                                                TTIPRI | PCATCH, "cybi", 0);
  715                                 if (error != 0)
  716                                         goto out;
  717                                 goto open_top;
  718                         }
  719                 }
  720                 if (tp->t_state & TS_XCLUDE &&
  721                     suser(td)) {
  722                         error = EBUSY;
  723                         goto out;
  724                 }
  725         } else {
  726                 /*
  727                  * The device isn't open, so there are no conflicts.
  728                  * Initialize it.  Initialization is done twice in many
  729                  * cases: to preempt sleeping callin opens if we are
  730                  * callout, and to complete a callin open after DCD rises.
  731                  */
  732                 tp->t_oproc = comstart;
  733                 tp->t_stop = comstop;
  734                 tp->t_param = comparam;
  735                 tp->t_dev = dev;
  736                 tp->t_termios = mynor & CALLOUT_MASK
  737                                 ? com->it_out : com->it_in;
  738 
  739                 /* Encode per-board unit in LIVR for access in intr routines. */
  740                 cd_setreg(com, CD1400_LIVR,
  741                           (unit & CD1400_xIVR_CHAN) << CD1400_xIVR_CHAN_SHIFT);
  742 
  743                 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET);
  744 #if 0
  745                 com->poll = com->no_irq;
  746                 com->poll_output = com->loses_outints;
  747 #endif
  748                 ++com->wopeners;
  749                 error = comparam(tp, &tp->t_termios);
  750                 --com->wopeners;
  751                 if (error != 0)
  752                         goto out;
  753 #if 0
  754                 if (com->hasfifo) {
  755                         /*
  756                          * (Re)enable and flush fifos.
  757                          *
  758                          * Certain SMC chips cause problems if the fifos
  759                          * are enabled while input is ready.  Turn off the
  760                          * fifo if necessary to clear the input.  We test
  761                          * the input ready bit after enabling the fifos
  762                          * since we've already enabled them in comparam()
  763                          * and to handle races between enabling and fresh
  764                          * input.
  765                          */
  766                         while (TRUE) {
  767                                 outb(iobase + com_fifo,
  768                                      FIFO_RCV_RST | FIFO_XMT_RST
  769                                      | com->fifo_image);
  770                                 DELAY(100);
  771                                 if (!(inb(com->line_status_port) & LSR_RXRDY))
  772                                         break;
  773                                 outb(iobase + com_fifo, 0);
  774                                 DELAY(100);
  775                                 (void) inb(com->data_port);
  776                         }
  777                 }
  778 
  779                 critical_enter();
  780                 COM_LOCK();
  781                 (void) inb(com->line_status_port);
  782                 (void) inb(com->data_port);
  783                 com->prev_modem_status = com->last_modem_status
  784                     = inb(com->modem_status_port);
  785                 outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS
  786                                        | IER_EMSC);
  787                 COM_UNLOCK();
  788                 critical_exit();
  789 #else /* !0 */
  790                 /*
  791                  * Flush fifos.  This requires a full channel reset which
  792                  * also disables the transmitter and receiver.  Recover
  793                  * from this.
  794                  */
  795                 cd1400_channel_cmd(com,
  796                                    CD1400_CCR_CMDRESET | CD1400_CCR_CHANRESET);
  797                 cd1400_channel_cmd(com, com->channel_control);
  798 
  799                 critical_enter();
  800                 COM_LOCK();
  801                 com->prev_modem_status = com->last_modem_status
  802                     = cd_getreg(com, CD1400_MSVR2);
  803                 cd_setreg(com, CD1400_SRER,
  804                           com->intr_enable
  805                           = CD1400_SRER_MDMCH | CD1400_SRER_RXDATA);
  806                 COM_UNLOCK();
  807                 critical_exit();
  808 #endif /* 0 */
  809                 /*
  810                  * Handle initial DCD.  Callout devices get a fake initial
  811                  * DCD (trapdoor DCD).  If we are callout, then any sleeping
  812                  * callin opens get woken up and resume sleeping on "cybi"
  813                  * instead of "cydcd".
  814                  */
  815                 /*
  816                  * XXX `mynor & CALLOUT_MASK' should be
  817                  * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
  818                  * TRAPDOOR_CARRIER is the default initial state for callout
  819                  * devices and SOFT_CARRIER is like CLOCAL except it hides
  820                  * the true carrier.
  821                  */
  822                 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK)
  823                         (*linesw[tp->t_line].l_modem)(tp, 1);
  824         }
  825         /*
  826          * Wait for DCD if necessary.
  827          */
  828         if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK)
  829             && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) {
  830                 ++com->wopeners;
  831                 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "cydcd", 0);
  832                 --com->wopeners;
  833                 if (error != 0)
  834                         goto out;
  835                 goto open_top;
  836         }
  837         error = (*linesw[tp->t_line].l_open)(dev, tp);
  838         disc_optim(tp, &tp->t_termios, com);
  839         if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
  840                 com->active_out = TRUE;
  841         siosettimeout();
  842 out:
  843         splx(s);
  844         if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
  845                 comhardclose(com);
  846         return (error);
  847 }
  848 
  849 static int
  850 sioclose(dev, flag, mode, td)
  851         dev_t           dev;
  852         int             flag;
  853         int             mode;
  854         struct thread   *td;
  855 {
  856         struct com_s    *com;
  857         int             mynor;
  858         int             s;
  859         struct tty      *tp;
  860 
  861         mynor = minor(dev);
  862         if (mynor & CONTROL_MASK)
  863                 return (0);
  864         com = com_addr(MINOR_TO_UNIT(mynor));
  865         tp = com->tp;
  866         s = spltty();
  867         cd_etc(com, CD1400_ETC_STOPBREAK);
  868         (*linesw[tp->t_line].l_close)(tp, flag);
  869         disc_optim(tp, &tp->t_termios, com);
  870         comstop(tp, FREAD | FWRITE);
  871         comhardclose(com);
  872         ttyclose(tp);
  873         siosettimeout();
  874         splx(s);
  875 #ifdef broken /* session holds a ref to the tty; can't deallocate */
  876         ttyfree(tp);
  877         com->tp = NULL;
  878 #endif
  879         return (0);
  880 }
  881 
  882 static void
  883 comhardclose(com)
  884         struct com_s    *com;
  885 {
  886         cy_addr         iobase;
  887         int             s;
  888         struct tty      *tp;
  889         int             unit;
  890 
  891         unit = com->unit;
  892         iobase = com->iobase;
  893         s = spltty();
  894 #if 0
  895         com->poll = FALSE;
  896         com->poll_output = FALSE;
  897 #endif
  898         com->do_timestamp = 0;
  899 #if 0
  900         outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
  901 #else
  902         /* XXX */
  903         critical_enter();
  904         COM_LOCK();
  905         com->etc = ETC_NONE;
  906         cd_setreg(com, CD1400_COR2, com->cor[1] &= ~CD1400_COR2_ETC);
  907         COM_UNLOCK();
  908         critical_exit();
  909         cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
  910 #endif
  911 
  912         {
  913 #if 0
  914                 outb(iobase + com_ier, 0);
  915 #else
  916                 critical_enter();
  917                 COM_LOCK();
  918                 cd_setreg(com, CD1400_SRER, com->intr_enable = 0);
  919                 COM_UNLOCK();
  920                 critical_exit();
  921 #endif
  922                 tp = com->tp;
  923                 if ((tp->t_cflag & HUPCL)
  924                     /*
  925                      * XXX we will miss any carrier drop between here and the
  926                      * next open.  Perhaps we should watch DCD even when the
  927                      * port is closed; it is not sufficient to check it at
  928                      * the next open because it might go up and down while
  929                      * we're not watching.
  930                      */
  931                     || (!com->active_out
  932                        && !(com->prev_modem_status & MSR_DCD)
  933                        && !(com->it_in.c_cflag & CLOCAL))
  934                     || !(tp->t_state & TS_ISOPEN)) {
  935                         (void)commctl(com, TIOCM_DTR, DMBIC);
  936 
  937                         /* Disable receiver (leave transmitter enabled). */
  938                         com->channel_control = CD1400_CCR_CMDCHANCTL
  939                                                | CD1400_CCR_XMTEN
  940                                                | CD1400_CCR_RCVDIS;
  941                         cd1400_channel_cmd(com, com->channel_control);
  942 
  943                         if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) {
  944                                 timeout(siodtrwakeup, com, com->dtr_wait);
  945                                 com->state |= CS_DTR_OFF;
  946                         }
  947                 }
  948         }
  949 #if 0
  950         if (com->hasfifo) {
  951                 /*
  952                  * Disable fifos so that they are off after controlled
  953                  * reboots.  Some BIOSes fail to detect 16550s when the
  954                  * fifos are enabled.
  955                  */
  956                 outb(iobase + com_fifo, 0);
  957         }
  958 #endif
  959         com->active_out = FALSE;
  960         wakeup(&com->active_out);
  961         wakeup(TSA_CARR_ON(tp));        /* restart any wopeners */
  962         splx(s);
  963 }
  964 
  965 static int
  966 siowrite(dev, uio, flag)
  967         dev_t           dev;
  968         struct uio      *uio;
  969         int             flag;
  970 {
  971         int             mynor;
  972         struct tty      *tp;
  973         int             unit;
  974 
  975         mynor = minor(dev);
  976         if (mynor & CONTROL_MASK)
  977                 return (ENODEV);
  978 
  979         unit = MINOR_TO_UNIT(mynor);
  980         tp = com_addr(unit)->tp;
  981         /*
  982          * (XXX) We disallow virtual consoles if the physical console is
  983          * a serial port.  This is in case there is a display attached that
  984          * is not the console.  In that situation we don't need/want the X
  985          * server taking over the console.
  986          */
  987         if (constty != NULL && unit == comconsole)
  988                 constty = NULL;
  989 #ifdef Smarts
  990         /* XXX duplicate ttwrite(), but without so much output processing on
  991          * CR & LF chars.  Hardly worth the effort, given that high-throughput
  992          * sessions are raw anyhow.
  993          */
  994 #else
  995         return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
  996 #endif
  997 }
  998 
  999 static void
 1000 siodtrwakeup(chan)
 1001         void    *chan;
 1002 {
 1003         struct com_s    *com;
 1004 
 1005         com = (struct com_s *)chan;
 1006         com->state &= ~CS_DTR_OFF;
 1007         wakeup(&com->dtr_wait);
 1008 }
 1009 
 1010 /*
 1011  * This function:
 1012  *  a) needs to be called with COM_LOCK() held, and
 1013  *  b) needs to return with COM_LOCK() held.
 1014  */
 1015 static void
 1016 sioinput(com)
 1017         struct com_s    *com;
 1018 {
 1019         u_char          *buf;
 1020         int             incc;
 1021         u_char          line_status;
 1022         int             recv_data;
 1023         struct tty      *tp;
 1024 
 1025         buf = com->ibuf;
 1026         tp = com->tp;
 1027         if (!(tp->t_state & TS_ISOPEN)) {
 1028                 com_events -= (com->iptr - com->ibuf);
 1029                 com->iptr = com->ibuf;
 1030                 return;
 1031         }
 1032         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
 1033                 /*
 1034                  * Avoid the grotesquely inefficient lineswitch routine
 1035                  * (ttyinput) in "raw" mode.  It usually takes about 450
 1036                  * instructions (that's without canonical processing or echo!).
 1037                  * slinput is reasonably fast (usually 40 instructions plus
 1038                  * call overhead).
 1039                  */
 1040 
 1041                 do {
 1042                         /*
 1043                          * This may look odd, but it is using save-and-enable
 1044                          * semantics instead of the save-and-disable semantics
 1045                          * that are used everywhere else.
 1046                          */
 1047                         COM_UNLOCK();
 1048                         critical_exit();
 1049                         incc = com->iptr - buf;
 1050                         if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
 1051                             && (com->state & CS_RTS_IFLOW
 1052                                 || tp->t_iflag & IXOFF)
 1053                             && !(tp->t_state & TS_TBLOCK))
 1054                                 ttyblock(tp);
 1055                         com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
 1056                                 += b_to_q((char *)buf, incc, &tp->t_rawq);
 1057                         buf += incc;
 1058                         tk_nin += incc;
 1059                         tk_rawcc += incc;
 1060                         tp->t_rawcc += incc;
 1061                         ttwakeup(tp);
 1062                         if (tp->t_state & TS_TTSTOP
 1063                             && (tp->t_iflag & IXANY
 1064                                 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
 1065                                 tp->t_state &= ~TS_TTSTOP;
 1066                                 tp->t_lflag &= ~FLUSHO;
 1067                                 comstart(tp);
 1068                         }
 1069                         critical_enter();
 1070                         COM_LOCK();
 1071                 } while (buf < com->iptr);
 1072         } else {
 1073                 do {
 1074                         /*
 1075                          * This may look odd, but it is using save-and-enable
 1076                          * semantics instead of the save-and-disable semantics
 1077                          * that are used everywhere else.
 1078                          */
 1079                         COM_UNLOCK();
 1080                         critical_exit();
 1081                         line_status = buf[com->ierroff];
 1082                         recv_data = *buf++;
 1083                         if (line_status
 1084                             & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
 1085                                 if (line_status & LSR_BI)
 1086                                         recv_data |= TTY_BI;
 1087                                 if (line_status & LSR_FE)
 1088                                         recv_data |= TTY_FE;
 1089                                 if (line_status & LSR_OE)
 1090                                         recv_data |= TTY_OE;
 1091                                 if (line_status & LSR_PE)
 1092                                         recv_data |= TTY_PE;
 1093                         }
 1094                         (*linesw[tp->t_line].l_rint)(recv_data, tp);
 1095                         critical_enter();
 1096                         COM_LOCK();
 1097                 } while (buf < com->iptr);
 1098         }
 1099         com_events -= (com->iptr - com->ibuf);
 1100         com->iptr = com->ibuf;
 1101 
 1102         /*
 1103          * There is now room for another low-level buffer full of input,
 1104          * so enable RTS if it is now disabled and there is room in the
 1105          * high-level buffer.
 1106          */
 1107         if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & com->mcr_rts) &&
 1108             !(tp->t_state & TS_TBLOCK))
 1109 #if 0
 1110                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
 1111 #else
 1112                 cd_setreg(com, com->mcr_rts_reg,
 1113                           com->mcr_image |= com->mcr_rts);
 1114 #endif
 1115 }
 1116 
 1117 void
 1118 siointr(unit)
 1119         int     unit;
 1120 {
 1121         int     baseu;
 1122         int     cy_align;
 1123         cy_addr cy_iobase;
 1124         int     cyu;
 1125         cy_addr iobase;
 1126         u_char  status;
 1127 
 1128         COM_LOCK();     /* XXX could this be placed down lower in the loop? */
 1129 
 1130         baseu = unit * CY_MAX_PORTS;
 1131         cy_align = com_addr(baseu)->cy_align;
 1132         cy_iobase = com_addr(baseu)->cy_iobase;
 1133 
 1134         /* check each CD1400 in turn */
 1135         for (cyu = 0; cyu < cy_nr_cd1400s[unit]; ++cyu) {
 1136                 iobase = (cy_addr) (cy_iobase
 1137                                     + (cy_chip_offset[cyu] << cy_align));
 1138                 /* poll to see if it has any work */
 1139                 status = cd_inb(iobase, CD1400_SVRR, cy_align);
 1140                 if (status == 0)
 1141                         continue;
 1142 #ifdef CyDebug
 1143                 ++cy_svrr_probes;
 1144 #endif
 1145                 /* service requests as appropriate, giving priority to RX */
 1146                 if (status & CD1400_SVRR_RXRDY) {
 1147                         struct com_s    *com;
 1148                         u_int           count;
 1149                         u_char          *ioptr;
 1150                         u_char          line_status;
 1151                         u_char          recv_data;
 1152                         u_char          serv_type;
 1153 #ifdef PollMode
 1154                         u_char          save_rir;
 1155 #endif
 1156 
 1157 #ifdef PollMode
 1158                         save_rir = cd_inb(iobase, CD1400_RIR, cy_align);
 1159 
 1160                         /* enter rx service */
 1161                         cd_outb(iobase, CD1400_CAR, cy_align, save_rir);
 1162                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
 1163                         = save_rir & CD1400_CAR_CHAN;
 1164 
 1165                         serv_type = cd_inb(iobase, CD1400_RIVR, cy_align);
 1166                         com = com_addr(baseu
 1167                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
 1168                                           & CD1400_xIVR_CHAN));
 1169 #else
 1170                         /* ack receive service */
 1171                         serv_type = cy_inb(iobase, CY8_SVCACKR, cy_align);
 1172 
 1173                         com = com_addr(baseu +
 1174                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
 1175                                           & CD1400_xIVR_CHAN));
 1176 #endif
 1177 
 1178                 if (serv_type & CD1400_RIVR_EXCEPTION) {
 1179                         ++com->recv_exception;
 1180                         line_status = cd_inb(iobase, CD1400_RDSR, cy_align);
 1181                         /* break/unnattached error bits or real input? */
 1182                         recv_data = cd_inb(iobase, CD1400_RDSR, cy_align);
 1183 #ifndef SOFT_HOTCHAR
 1184                         if (line_status & CD1400_RDSR_SPECIAL
 1185                             && com->hotchar != 0)
 1186                                 swi_sched(sio_ih, 0);
 1187 
 1188 #endif
 1189 #if 1 /* XXX "intelligent" PFO error handling would break O error handling */
 1190                         if (line_status & (LSR_PE|LSR_FE|LSR_BI)) {
 1191                                 /*
 1192                                   Don't store PE if IGNPAR and BI if IGNBRK,
 1193                                   this hack allows "raw" tty optimization
 1194                                   works even if IGN* is set.
 1195                                 */
 1196                                 if (   com->tp == NULL
 1197                                     || !(com->tp->t_state & TS_ISOPEN)
 1198                                     || ((line_status & (LSR_PE|LSR_FE))
 1199                                     &&  (com->tp->t_iflag & IGNPAR))
 1200                                     || ((line_status & LSR_BI)
 1201                                     &&  (com->tp->t_iflag & IGNBRK)))
 1202                                         goto cont;
 1203                                 if (   (line_status & (LSR_PE|LSR_FE))
 1204                                     && (com->tp->t_state & TS_CAN_BYPASS_L_RINT)
 1205                                     && ((line_status & LSR_FE)
 1206                                     ||  ((line_status & LSR_PE)
 1207                                     &&  (com->tp->t_iflag & INPCK))))
 1208                                         recv_data = 0;
 1209                         }
 1210 #endif /* 1 */
 1211                         ++com->bytes_in;
 1212 #ifdef SOFT_HOTCHAR
 1213                         if (com->hotchar != 0 && recv_data == com->hotchar)
 1214                                 swi_sched(sio_ih, 0);
 1215 #endif
 1216                         ioptr = com->iptr;
 1217                         if (ioptr >= com->ibufend)
 1218                                 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
 1219                         else {
 1220                                 if (com->do_timestamp)
 1221                                         microtime(&com->timestamp);
 1222                                 ++com_events;
 1223                                 ioptr[0] = recv_data;
 1224                                 ioptr[com->ierroff] = line_status;
 1225                                 com->iptr = ++ioptr;
 1226                                 if (ioptr == com->ihighwater
 1227                                     && com->state & CS_RTS_IFLOW)
 1228 #if 0
 1229                                         outb(com->modem_ctl_port,
 1230                                              com->mcr_image &= ~MCR_RTS);
 1231 #else
 1232                                         cd_outb(iobase, com->mcr_rts_reg,
 1233                                                 cy_align,
 1234                                                 com->mcr_image &=
 1235                                                 ~com->mcr_rts);
 1236 #endif
 1237                                 if (line_status & LSR_OE)
 1238                                         CE_RECORD(com, CE_OVERRUN);
 1239                         }
 1240                         goto cont;
 1241                 } else {
 1242                         int     ifree;
 1243 
 1244                         count = cd_inb(iobase, CD1400_RDCR, cy_align);
 1245                         if (!count)
 1246                                 goto cont;
 1247                         com->bytes_in += count;
 1248                         ioptr = com->iptr;
 1249                         ifree = com->ibufend - ioptr;
 1250                         if (count > ifree) {
 1251                                 count -= ifree;
 1252                                 com_events += ifree;
 1253                                 if (ifree != 0) {
 1254                                         if (com->do_timestamp)
 1255                                                 microtime(&com->timestamp);
 1256                                         do {
 1257                                                 recv_data = cd_inb(iobase,
 1258                                                                    CD1400_RDSR,
 1259                                                                    cy_align);
 1260 #ifdef SOFT_HOTCHAR
 1261                                                 if (com->hotchar != 0
 1262                                                     && recv_data
 1263                                                        == com->hotchar)
 1264                                                         swi_sched(sio_ih, 0);
 1265 #endif
 1266                                                 ioptr[0] = recv_data;
 1267                                                 ioptr[com->ierroff] = 0;
 1268                                                 ++ioptr;
 1269                                         } while (--ifree != 0);
 1270                                 }
 1271                                 com->delta_error_counts
 1272                                     [CE_INTERRUPT_BUF_OVERFLOW] += count;
 1273                                 do {
 1274                                         recv_data = cd_inb(iobase, CD1400_RDSR,
 1275                                                            cy_align);
 1276 #ifdef SOFT_HOTCHAR
 1277                                         if (com->hotchar != 0
 1278                                             && recv_data == com->hotchar)
 1279                                                 swi_sched(sio_ih, 0);
 1280 #endif
 1281                                 } while (--count != 0);
 1282                         } else {
 1283                                 if (com->do_timestamp)
 1284                                         microtime(&com->timestamp);
 1285                                 if (ioptr <= com->ihighwater
 1286                                     && ioptr + count > com->ihighwater
 1287                                     && com->state & CS_RTS_IFLOW)
 1288 #if 0
 1289                                         outb(com->modem_ctl_port,
 1290                                              com->mcr_image &= ~MCR_RTS);
 1291 #else
 1292                                         cd_outb(iobase, com->mcr_rts_reg,
 1293                                                 cy_align,
 1294                                                 com->mcr_image
 1295                                                 &= ~com->mcr_rts);
 1296 #endif
 1297                                 com_events += count;
 1298                                 do {
 1299                                         recv_data = cd_inb(iobase, CD1400_RDSR,
 1300                                                            cy_align);
 1301 #ifdef SOFT_HOTCHAR
 1302                                         if (com->hotchar != 0
 1303                                             && recv_data == com->hotchar)
 1304                                                 swi_sched(sio_ih, 0);
 1305 #endif
 1306                                         ioptr[0] = recv_data;
 1307                                         ioptr[com->ierroff] = 0;
 1308                                         ++ioptr;
 1309                                 } while (--count != 0);
 1310                         }
 1311                         com->iptr = ioptr;
 1312                 }
 1313 cont:
 1314 
 1315                         /* terminate service context */
 1316 #ifdef PollMode
 1317                         cd_outb(iobase, CD1400_RIR, cy_align,
 1318                                 save_rir
 1319                                 & ~(CD1400_RIR_RDIREQ | CD1400_RIR_RBUSY));
 1320 #else
 1321                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
 1322 #endif
 1323                 }
 1324                 if (status & CD1400_SVRR_MDMCH) {
 1325                         struct com_s    *com;
 1326                         u_char  modem_status;
 1327 #ifdef PollMode
 1328                         u_char  save_mir;
 1329 #else
 1330                         u_char  vector;
 1331 #endif
 1332 
 1333 #ifdef PollMode
 1334                         save_mir = cd_inb(iobase, CD1400_MIR, cy_align);
 1335 
 1336                         /* enter modem service */
 1337                         cd_outb(iobase, CD1400_CAR, cy_align, save_mir);
 1338                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
 1339                         = save_mir & CD1400_CAR_CHAN;
 1340 
 1341                         com = com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS
 1342                                        + (save_mir & CD1400_MIR_CHAN));
 1343 #else
 1344                         /* ack modem service */
 1345                         vector = cy_inb(iobase, CY8_SVCACKM, cy_align);
 1346 
 1347                         com = com_addr(baseu
 1348                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
 1349                                           & CD1400_xIVR_CHAN));
 1350 #endif
 1351                         ++com->mdm;
 1352                         modem_status = cd_inb(iobase, CD1400_MSVR2, cy_align);
 1353                 if (modem_status != com->last_modem_status) {
 1354                         if (com->do_dcd_timestamp
 1355                             && !(com->last_modem_status & MSR_DCD)
 1356                             && modem_status & MSR_DCD)
 1357                                 microtime(&com->dcd_timestamp);
 1358 
 1359                         /*
 1360                          * Schedule high level to handle DCD changes.  Note
 1361                          * that we don't use the delta bits anywhere.  Some
 1362                          * UARTs mess them up, and it's easy to remember the
 1363                          * previous bits and calculate the delta.
 1364                          */
 1365                         com->last_modem_status = modem_status;
 1366                         if (!(com->state & CS_CHECKMSR)) {
 1367                                 com_events += LOTS_OF_EVENTS;
 1368                                 com->state |= CS_CHECKMSR;
 1369                                 swi_sched(sio_ih, 0);
 1370                         }
 1371 
 1372 #ifdef SOFT_CTS_OFLOW
 1373                         /* handle CTS change immediately for crisp flow ctl */
 1374                         if (com->state & CS_CTS_OFLOW) {
 1375                                 if (modem_status & MSR_CTS) {
 1376                                         com->state |= CS_ODEVREADY;
 1377                                         if (com->state >= (CS_BUSY | CS_TTGO
 1378                                                            | CS_ODEVREADY)
 1379                                             && !(com->intr_enable
 1380                                                  & CD1400_SRER_TXRDY))
 1381                                                 cd_outb(iobase, CD1400_SRER,
 1382                                                         cy_align,
 1383                                                         com->intr_enable
 1384                                                         = com->intr_enable
 1385                                                           & ~CD1400_SRER_TXMPTY
 1386                                                           | CD1400_SRER_TXRDY);
 1387                                 } else {
 1388                                         com->state &= ~CS_ODEVREADY;
 1389                                         if (com->intr_enable
 1390                                             & CD1400_SRER_TXRDY)
 1391                                                 cd_outb(iobase, CD1400_SRER,
 1392                                                         cy_align,
 1393                                                         com->intr_enable
 1394                                                         = com->intr_enable
 1395                                                           & ~CD1400_SRER_TXRDY
 1396                                                           | CD1400_SRER_TXMPTY);
 1397                                 }
 1398                         }
 1399 #endif
 1400                 }
 1401 
 1402                         /* terminate service context */
 1403 #ifdef PollMode
 1404                         cd_outb(iobase, CD1400_MIR, cy_align,
 1405                                 save_mir
 1406                                 & ~(CD1400_MIR_RDIREQ | CD1400_MIR_RBUSY));
 1407 #else
 1408                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
 1409 #endif
 1410                 }
 1411                 if (status & CD1400_SVRR_TXRDY) {
 1412                         struct com_s    *com;
 1413 #ifdef PollMode
 1414                         u_char  save_tir;
 1415 #else
 1416                         u_char  vector;
 1417 #endif
 1418 
 1419 #ifdef PollMode
 1420                         save_tir = cd_inb(iobase, CD1400_TIR, cy_align);
 1421 
 1422                         /* enter tx service */
 1423                         cd_outb(iobase, CD1400_CAR, cy_align, save_tir);
 1424                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
 1425                         = save_tir & CD1400_CAR_CHAN;
 1426 
 1427                         com = com_addr(baseu
 1428                                        + cyu * CD1400_NO_OF_CHANNELS
 1429                                        + (save_tir & CD1400_TIR_CHAN));
 1430 #else
 1431                         /* ack transmit service */
 1432                         vector = cy_inb(iobase, CY8_SVCACKT, cy_align);
 1433 
 1434                         com = com_addr(baseu
 1435                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
 1436                                           & CD1400_xIVR_CHAN));
 1437 #endif
 1438 
 1439                         if (com->etc != ETC_NONE) {
 1440                                 if (com->intr_enable & CD1400_SRER_TXRDY) {
 1441                                         /*
 1442                                          * Here due to sloppy SRER_TXRDY
 1443                                          * enabling.  Ignore.  Come back when
 1444                                          * tx is empty.
 1445                                          */
 1446                                         cd_outb(iobase, CD1400_SRER, cy_align,
 1447                                                 com->intr_enable
 1448                                                 = (com->intr_enable
 1449                                                   & ~CD1400_SRER_TXRDY)
 1450                                                   | CD1400_SRER_TXMPTY);
 1451                                         goto terminate_tx_service;
 1452                                 }
 1453                                 switch (com->etc) {
 1454                                 case CD1400_ETC_SENDBREAK:
 1455                                 case CD1400_ETC_STOPBREAK:
 1456                                         /*
 1457                                          * Start the command.  Come back on
 1458                                          * next tx empty interrupt, hopefully
 1459                                          * after command has been executed.
 1460                                          */
 1461                                         cd_outb(iobase, CD1400_COR2, cy_align,
 1462                                                 com->cor[1] |= CD1400_COR2_ETC);
 1463                                         cd_outb(iobase, CD1400_TDR, cy_align,
 1464                                                 CD1400_ETC_CMD);
 1465                                         cd_outb(iobase, CD1400_TDR, cy_align,
 1466                                                 com->etc);
 1467                                         if (com->etc == CD1400_ETC_SENDBREAK)
 1468                                                 com->etc = ETC_BREAK_STARTING;
 1469                                         else
 1470                                                 com->etc = ETC_BREAK_ENDING;
 1471                                         goto terminate_tx_service;
 1472                                 case ETC_BREAK_STARTING:
 1473                                         /*
 1474                                          * BREAK is now on.  Continue with
 1475                                          * SRER_TXMPTY processing, hopefully
 1476                                          * don't come back.
 1477                                          */
 1478                                         com->etc = ETC_BREAK_STARTED;
 1479                                         break;
 1480                                 case ETC_BREAK_STARTED:
 1481                                         /*
 1482                                          * Came back due to sloppy SRER_TXMPTY
 1483                                          * enabling.  Hope again.
 1484                                          */
 1485                                         break;
 1486                                 case ETC_BREAK_ENDING:
 1487                                         /*
 1488                                          * BREAK is now off.  Continue with
 1489                                          * SRER_TXMPTY processing and don't
 1490                                          * come back.  The SWI handler will
 1491                                          * restart tx interrupts if necessary.
 1492                                          */
 1493                                         cd_outb(iobase, CD1400_COR2, cy_align,
 1494                                                 com->cor[1]
 1495                                                 &= ~CD1400_COR2_ETC);
 1496                                         com->etc = ETC_BREAK_ENDED;
 1497                                         if (!(com->state & CS_ODONE)) {
 1498                                                 com_events += LOTS_OF_EVENTS;
 1499                                                 com->state |= CS_ODONE;
 1500                                                 swi_sched(sio_ih, 0);
 1501                                         }
 1502                                         break;
 1503                                 case ETC_BREAK_ENDED:
 1504                                         /*
 1505                                          * Shouldn't get here.  Hope again.
 1506                                          */
 1507                                         break;
 1508                                 }
 1509                         }
 1510                         if (com->intr_enable & CD1400_SRER_TXMPTY) {
 1511                                 if (!(com->extra_state & CSE_ODONE)) {
 1512                                         com_events += LOTS_OF_EVENTS;
 1513                                         com->extra_state |= CSE_ODONE;
 1514                                         swi_sched(sio_ih, 0);
 1515                                 }
 1516                                 cd_outb(iobase, CD1400_SRER, cy_align,
 1517                                         com->intr_enable
 1518                                         &= ~CD1400_SRER_TXMPTY);
 1519                                 goto terminate_tx_service;
 1520                         }
 1521                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
 1522                         u_char  *ioptr;
 1523                         u_int   ocount;
 1524 
 1525                         ioptr = com->obufq.l_head;
 1526                                 ocount = com->obufq.l_tail - ioptr;
 1527                                 if (ocount > CD1400_TX_FIFO_SIZE)
 1528                                         ocount = CD1400_TX_FIFO_SIZE;
 1529                                 com->bytes_out += ocount;
 1530                                 do
 1531                                         cd_outb(iobase, CD1400_TDR, cy_align,
 1532                                                 *ioptr++);
 1533                                 while (--ocount != 0);
 1534                         com->obufq.l_head = ioptr;
 1535                         if (ioptr >= com->obufq.l_tail) {
 1536                                 struct lbq      *qp;
 1537 
 1538                                 qp = com->obufq.l_next;
 1539                                 qp->l_queued = FALSE;
 1540                                 qp = qp->l_next;
 1541                                 if (qp != NULL) {
 1542                                         com->obufq.l_head = qp->l_head;
 1543                                         com->obufq.l_tail = qp->l_tail;
 1544                                         com->obufq.l_next = qp;
 1545                                 } else {
 1546                                         /* output just completed */
 1547                                         com->state &= ~CS_BUSY;
 1548 
 1549                                         /*
 1550                                          * The setting of CSE_ODONE may be
 1551                                          * stale here.  We currently only
 1552                                          * use it when CS_BUSY is set, and
 1553                                          * fixing it when we clear CS_BUSY
 1554                                          * is easiest.
 1555                                          */
 1556                                         if (com->extra_state & CSE_ODONE) {
 1557                                                 com_events -= LOTS_OF_EVENTS;
 1558                                                 com->extra_state &= ~CSE_ODONE;
 1559                                         }
 1560 
 1561                                         cd_outb(iobase, CD1400_SRER, cy_align,
 1562                                                 com->intr_enable
 1563                                                 = (com->intr_enable
 1564                                                   & ~CD1400_SRER_TXRDY)
 1565                                                   | CD1400_SRER_TXMPTY);
 1566                                 }
 1567                                 if (!(com->state & CS_ODONE)) {
 1568                                         com_events += LOTS_OF_EVENTS;
 1569                                         com->state |= CS_ODONE;
 1570 
 1571                                         /* handle at high level ASAP */
 1572                                         swi_sched(sio_ih, 0);
 1573                                 }
 1574                         }
 1575                 }
 1576 
 1577                         /* terminate service context */
 1578 terminate_tx_service:
 1579 #ifdef PollMode
 1580                         cd_outb(iobase, CD1400_TIR, cy_align,
 1581                                 save_tir
 1582                                 & ~(CD1400_TIR_RDIREQ | CD1400_TIR_RBUSY));
 1583 #else
 1584                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
 1585 #endif
 1586                 }
 1587         }
 1588 
 1589         /* ensure an edge for the next interrupt */
 1590         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
 1591 
 1592         swi_sched(sio_ih, 0);
 1593 
 1594         COM_UNLOCK();
 1595 }
 1596 
 1597 #if 0
 1598 static void
 1599 siointr1(com)
 1600         struct com_s    *com;
 1601 {
 1602 }
 1603 #endif
 1604 
 1605 static int
 1606 sioioctl(dev, cmd, data, flag, td)
 1607         dev_t           dev;
 1608         u_long          cmd;
 1609         caddr_t         data;
 1610         int             flag;
 1611         struct thread   *td;
 1612 {
 1613         struct com_s    *com;
 1614         int             error;
 1615         int             mynor;
 1616         int             s;
 1617         struct tty      *tp;
 1618 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
 1619         int             oldcmd;
 1620         struct termios  term;
 1621 #endif
 1622 
 1623         mynor = minor(dev);
 1624         com = com_addr(MINOR_TO_UNIT(mynor));
 1625         if (mynor & CONTROL_MASK) {
 1626                 struct termios  *ct;
 1627 
 1628                 switch (mynor & CONTROL_MASK) {
 1629                 case CONTROL_INIT_STATE:
 1630                         ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in;
 1631                         break;
 1632                 case CONTROL_LOCK_STATE:
 1633                         ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in;
 1634                         break;
 1635                 default:
 1636                         return (ENODEV);        /* /dev/nodev */
 1637                 }
 1638                 switch (cmd) {
 1639                 case TIOCSETA:
 1640                         error = suser(td);
 1641                         if (error != 0)
 1642                                 return (error);
 1643                         *ct = *(struct termios *)data;
 1644                         return (0);
 1645                 case TIOCGETA:
 1646                         *(struct termios *)data = *ct;
 1647                         return (0);
 1648                 case TIOCGETD:
 1649                         *(int *)data = TTYDISC;
 1650                         return (0);
 1651                 case TIOCGWINSZ:
 1652                         bzero(data, sizeof(struct winsize));
 1653                         return (0);
 1654                 default:
 1655                         return (ENOTTY);
 1656                 }
 1657         }
 1658         tp = com->tp;
 1659 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
 1660         term = tp->t_termios;
 1661         oldcmd = cmd;
 1662         error = ttsetcompat(tp, &cmd, data, &term);
 1663         if (error != 0)
 1664                 return (error);
 1665         if (cmd != oldcmd)
 1666                 data = (caddr_t)&term;
 1667 #endif
 1668         if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
 1669                 int     cc;
 1670                 struct termios *dt = (struct termios *)data;
 1671                 struct termios *lt = mynor & CALLOUT_MASK
 1672                                      ? &com->lt_out : &com->lt_in;
 1673 
 1674                 dt->c_iflag = (tp->t_iflag & lt->c_iflag)
 1675                               | (dt->c_iflag & ~lt->c_iflag);
 1676                 dt->c_oflag = (tp->t_oflag & lt->c_oflag)
 1677                               | (dt->c_oflag & ~lt->c_oflag);
 1678                 dt->c_cflag = (tp->t_cflag & lt->c_cflag)
 1679                               | (dt->c_cflag & ~lt->c_cflag);
 1680                 dt->c_lflag = (tp->t_lflag & lt->c_lflag)
 1681                               | (dt->c_lflag & ~lt->c_lflag);
 1682                 for (cc = 0; cc < NCCS; ++cc)
 1683                         if (lt->c_cc[cc] != 0)
 1684                                 dt->c_cc[cc] = tp->t_cc[cc];
 1685                 if (lt->c_ispeed != 0)
 1686                         dt->c_ispeed = tp->t_ispeed;
 1687                 if (lt->c_ospeed != 0)
 1688                         dt->c_ospeed = tp->t_ospeed;
 1689         }
 1690         error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
 1691         if (error != ENOIOCTL)
 1692                 return (error);
 1693         s = spltty();
 1694         error = ttioctl(tp, cmd, data, flag);
 1695         disc_optim(tp, &tp->t_termios, com);
 1696         if (error != ENOIOCTL) {
 1697                 splx(s);
 1698                 return (error);
 1699         }
 1700         switch (cmd) {
 1701         case TIOCSBRK:
 1702 #if 0
 1703                 outb(iobase + com_cfcr, com->cfcr_image |= CFCR_SBREAK);
 1704 #else
 1705                 cd_etc(com, CD1400_ETC_SENDBREAK);
 1706 #endif
 1707                 break;
 1708         case TIOCCBRK:
 1709 #if 0
 1710                 outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
 1711 #else
 1712                 cd_etc(com, CD1400_ETC_STOPBREAK);
 1713 #endif
 1714                 break;
 1715         case TIOCSDTR:
 1716                 (void)commctl(com, TIOCM_DTR, DMBIS);
 1717                 break;
 1718         case TIOCCDTR:
 1719                 (void)commctl(com, TIOCM_DTR, DMBIC);
 1720                 break;
 1721         /*
 1722          * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set.  The
 1723          * changes get undone on the next call to comparam().
 1724          */
 1725         case TIOCMSET:
 1726                 (void)commctl(com, *(int *)data, DMSET);
 1727                 break;
 1728         case TIOCMBIS:
 1729                 (void)commctl(com, *(int *)data, DMBIS);
 1730                 break;
 1731         case TIOCMBIC:
 1732                 (void)commctl(com, *(int *)data, DMBIC);
 1733                 break;
 1734         case TIOCMGET:
 1735                 *(int *)data = commctl(com, 0, DMGET);
 1736                 break;
 1737         case TIOCMSDTRWAIT:
 1738                 /* must be root since the wait applies to following logins */
 1739                 error = suser(td);
 1740                 if (error != 0) {
 1741                         splx(s);
 1742                         return (error);
 1743                 }
 1744                 com->dtr_wait = *(int *)data * hz / 100;
 1745                 break;
 1746         case TIOCMGDTRWAIT:
 1747                 *(int *)data = com->dtr_wait * 100 / hz;
 1748                 break;
 1749         case TIOCTIMESTAMP:
 1750                 com->do_timestamp = TRUE;
 1751                 *(struct timeval *)data = com->timestamp;
 1752                 break;
 1753         case TIOCDCDTIMESTAMP:
 1754                 com->do_dcd_timestamp = TRUE;
 1755                 *(struct timeval *)data = com->dcd_timestamp;
 1756                 break;
 1757         default:
 1758                 splx(s);
 1759                 return (ENOTTY);
 1760         }
 1761         splx(s);
 1762         return (0);
 1763 }
 1764 
 1765 static void
 1766 siopoll(void *arg)
 1767 {
 1768         int             unit;
 1769 
 1770 #ifdef CyDebug
 1771         ++cy_timeouts;
 1772 #endif
 1773         if (com_events == 0)
 1774                 return;
 1775 repeat:
 1776         for (unit = 0; unit < NSIO; ++unit) {
 1777                 struct com_s    *com;
 1778                 int             incc;
 1779                 struct tty      *tp;
 1780 
 1781                 com = com_addr(unit);
 1782                 if (com == NULL)
 1783                         continue;
 1784                 tp = com->tp;
 1785                 if (tp == NULL) {
 1786                         /*
 1787                          * XXX forget any events related to closed devices
 1788                          * (actually never opened devices) so that we don't
 1789                          * loop.
 1790                          */
 1791                         critical_enter();
 1792                         COM_LOCK();
 1793                         incc = com->iptr - com->ibuf;
 1794                         com->iptr = com->ibuf;
 1795                         if (com->state & CS_CHECKMSR) {
 1796                                 incc += LOTS_OF_EVENTS;
 1797                                 com->state &= ~CS_CHECKMSR;
 1798                         }
 1799                         com_events -= incc;
 1800                         COM_UNLOCK();
 1801                         critical_exit();
 1802                         if (incc != 0)
 1803                                 log(LOG_DEBUG,
 1804                                     "sio%d: %d events for device with no tp\n",
 1805                                     unit, incc);
 1806                         continue;
 1807                 }
 1808                 if (com->iptr != com->ibuf) {
 1809                         critical_enter();
 1810                         COM_LOCK();
 1811                         sioinput(com);
 1812                         COM_UNLOCK();
 1813                         critical_exit();
 1814                 }
 1815                 if (com->state & CS_CHECKMSR) {
 1816                         u_char  delta_modem_status;
 1817 
 1818                         critical_enter();
 1819                         COM_LOCK();
 1820                         sioinput(com);
 1821                         delta_modem_status = com->last_modem_status
 1822                                              ^ com->prev_modem_status;
 1823                         com->prev_modem_status = com->last_modem_status;
 1824                         com_events -= LOTS_OF_EVENTS;
 1825                         com->state &= ~CS_CHECKMSR;
 1826                         COM_UNLOCK();
 1827                         critical_exit();
 1828                         if (delta_modem_status & MSR_DCD)
 1829                                 (*linesw[tp->t_line].l_modem)
 1830                                         (tp, com->prev_modem_status & MSR_DCD);
 1831                 }
 1832                 if (com->extra_state & CSE_ODONE) {
 1833                         critical_enter();
 1834                         COM_LOCK();
 1835                         com_events -= LOTS_OF_EVENTS;
 1836                         com->extra_state &= ~CSE_ODONE;
 1837                         COM_UNLOCK();
 1838                         critical_exit();
 1839                         if (!(com->state & CS_BUSY)) {
 1840                                 tp->t_state &= ~TS_BUSY;
 1841                                 ttwwakeup(com->tp);
 1842                         }
 1843                         if (com->etc != ETC_NONE) {
 1844                                 if (com->etc == ETC_BREAK_ENDED)
 1845                                         com->etc = ETC_NONE;
 1846                                 wakeup(&com->etc);
 1847                         }
 1848                 }
 1849                 if (com->state & CS_ODONE) {
 1850                         critical_enter();
 1851                         COM_LOCK();
 1852                         com_events -= LOTS_OF_EVENTS;
 1853                         com->state &= ~CS_ODONE;
 1854                         COM_UNLOCK();
 1855                         critical_exit();
 1856                         (*linesw[tp->t_line].l_start)(tp);
 1857                 }
 1858                 if (com_events == 0)
 1859                         break;
 1860         }
 1861         if (com_events >= LOTS_OF_EVENTS)
 1862                 goto repeat;
 1863 }
 1864 
 1865 static int
 1866 comparam(tp, t)
 1867         struct tty      *tp;
 1868         struct termios  *t;
 1869 {
 1870         int             bits;
 1871         int             cflag;
 1872         struct com_s    *com;
 1873         u_char          cor_change;
 1874         u_long          cy_clock;
 1875         int             idivisor;
 1876         int             iflag;
 1877         int             iprescaler;
 1878         int             itimeout;
 1879         int             odivisor;
 1880         int             oprescaler;
 1881         u_char          opt;
 1882         int             s;
 1883         int             unit;
 1884 
 1885         /* do historical conversions */
 1886         if (t->c_ispeed == 0)
 1887                 t->c_ispeed = t->c_ospeed;
 1888 
 1889         unit = DEV_TO_UNIT(tp->t_dev);
 1890         com = com_addr(unit);
 1891 
 1892         /* check requested parameters */
 1893         cy_clock = CY_CLOCK(com->gfrcr_image);
 1894         idivisor = comspeed(t->c_ispeed, cy_clock, &iprescaler);
 1895         if (idivisor < 0)
 1896                 return (EINVAL);
 1897         odivisor = comspeed(t->c_ospeed, cy_clock, &oprescaler);
 1898         if (odivisor < 0)
 1899                 return (EINVAL);
 1900 
 1901         /* parameters are OK, convert them to the com struct and the device */
 1902         s = spltty();
 1903         if (odivisor == 0)
 1904                 (void)commctl(com, TIOCM_DTR, DMBIC);   /* hang up line */
 1905         else
 1906                 (void)commctl(com, TIOCM_DTR, DMBIS);
 1907 
 1908         (void) siosetwater(com, t->c_ispeed);
 1909 
 1910         /* XXX we don't actually change the speed atomically. */
 1911 
 1912         if (idivisor != 0) {
 1913                 cd_setreg(com, CD1400_RBPR, idivisor);
 1914                 cd_setreg(com, CD1400_RCOR, iprescaler);
 1915         }
 1916         if (odivisor != 0) {
 1917                 cd_setreg(com, CD1400_TBPR, odivisor);
 1918                 cd_setreg(com, CD1400_TCOR, oprescaler);
 1919         }
 1920 
 1921         /*
 1922          * channel control
 1923          *      receiver enable
 1924          *      transmitter enable (always set)
 1925          */
 1926         cflag = t->c_cflag;
 1927         opt = CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTEN
 1928               | (cflag & CREAD ? CD1400_CCR_RCVEN : CD1400_CCR_RCVDIS);
 1929         if (opt != com->channel_control) {
 1930                 com->channel_control = opt;
 1931                 cd1400_channel_cmd(com, opt);
 1932         }
 1933 
 1934 #ifdef Smarts
 1935         /* set special chars */
 1936         /* XXX if one is _POSIX_VDISABLE, can't use some others */
 1937         if (t->c_cc[VSTOP] != _POSIX_VDISABLE)
 1938                 cd_setreg(com, CD1400_SCHR1, t->c_cc[VSTOP]);
 1939         if (t->c_cc[VSTART] != _POSIX_VDISABLE)
 1940                 cd_setreg(com, CD1400_SCHR2, t->c_cc[VSTART]);
 1941         if (t->c_cc[VINTR] != _POSIX_VDISABLE)
 1942                 cd_setreg(com, CD1400_SCHR3, t->c_cc[VINTR]);
 1943         if (t->c_cc[VSUSP] != _POSIX_VDISABLE)
 1944                 cd_setreg(com, CD1400_SCHR4, t->c_cc[VSUSP]);
 1945 #endif
 1946 
 1947         /*
 1948          * set channel option register 1 -
 1949          *      parity mode
 1950          *      stop bits
 1951          *      char length
 1952          */
 1953         opt = 0;
 1954         /* parity */
 1955         if (cflag & PARENB) {
 1956                 if (cflag & PARODD)
 1957                         opt |= CD1400_COR1_PARODD;
 1958                 opt |= CD1400_COR1_PARNORMAL;
 1959         }
 1960         iflag = t->c_iflag;
 1961         if (!(iflag & INPCK))
 1962                 opt |= CD1400_COR1_NOINPCK;
 1963         bits = 1 + 1;
 1964         /* stop bits */
 1965         if (cflag & CSTOPB) {
 1966                 ++bits;
 1967                 opt |= CD1400_COR1_STOP2;
 1968         }
 1969         /* char length */
 1970         switch (cflag & CSIZE) {
 1971         case CS5:
 1972                 bits += 5;
 1973                 opt |= CD1400_COR1_CS5;
 1974                 break;
 1975         case CS6:
 1976                 bits += 6;
 1977                 opt |= CD1400_COR1_CS6;
 1978                 break;
 1979         case CS7:
 1980                 bits += 7;
 1981                 opt |= CD1400_COR1_CS7;
 1982                 break;
 1983         default:
 1984                 bits += 8;
 1985                 opt |= CD1400_COR1_CS8;
 1986                 break;
 1987         }
 1988         cor_change = 0;
 1989         if (opt != com->cor[0]) {
 1990                 cor_change |= CD1400_CCR_COR1;
 1991                 cd_setreg(com, CD1400_COR1, com->cor[0] = opt);
 1992         }
 1993 
 1994         /*
 1995          * Set receive time-out period, normally to max(one char time, 5 ms).
 1996          */
 1997         if (t->c_ispeed == 0)
 1998                 itimeout = cd_getreg(com, CD1400_RTPR);
 1999         else {
 2000                 itimeout = (1000 * bits + t->c_ispeed - 1) / t->c_ispeed;
 2001 #ifdef SOFT_HOTCHAR
 2002 #define MIN_RTP         1
 2003 #else
 2004 #define MIN_RTP         5
 2005 #endif
 2006                 if (itimeout < MIN_RTP)
 2007                         itimeout = MIN_RTP;
 2008         }
 2009         if (!(t->c_lflag & ICANON) && t->c_cc[VMIN] != 0 && t->c_cc[VTIME] != 0
 2010             && t->c_cc[VTIME] * 10 > itimeout)
 2011                 itimeout = t->c_cc[VTIME] * 10;
 2012         if (itimeout > 255)
 2013                 itimeout = 255;
 2014         cd_setreg(com, CD1400_RTPR, itimeout);
 2015 
 2016         /*
 2017          * set channel option register 2 -
 2018          *      flow control
 2019          */
 2020         opt = 0;
 2021 #ifdef Smarts
 2022         if (iflag & IXANY)
 2023                 opt |= CD1400_COR2_IXANY;
 2024         if (iflag & IXOFF)
 2025                 opt |= CD1400_COR2_IXOFF;
 2026 #endif
 2027 #ifndef SOFT_CTS_OFLOW
 2028         if (cflag & CCTS_OFLOW)
 2029                 opt |= CD1400_COR2_CCTS_OFLOW;
 2030 #endif
 2031         critical_enter();
 2032         COM_LOCK();
 2033         if (opt != com->cor[1]) {
 2034                 cor_change |= CD1400_CCR_COR2;
 2035                 cd_setreg(com, CD1400_COR2, com->cor[1] = opt);
 2036         }
 2037         COM_UNLOCK();
 2038         critical_exit();
 2039 
 2040         /*
 2041          * set channel option register 3 -
 2042          *      receiver FIFO interrupt threshold
 2043          *      flow control
 2044          */
 2045         opt = RxFifoThreshold;
 2046 #ifdef Smarts
 2047         if (t->c_lflag & ICANON)
 2048                 opt |= CD1400_COR3_SCD34;       /* detect INTR & SUSP chars */
 2049         if (iflag & IXOFF)
 2050                 /* detect and transparently handle START and STOP chars */
 2051                 opt |= CD1400_COR3_FCT | CD1400_COR3_SCD12;
 2052 #endif
 2053         if (opt != com->cor[2]) {
 2054                 cor_change |= CD1400_CCR_COR3;
 2055                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
 2056         }
 2057 
 2058         /* notify the CD1400 if COR1-3 have changed */
 2059         if (cor_change)
 2060                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | cor_change);
 2061 
 2062         /*
 2063          * set channel option register 4 -
 2064          *      CR/NL processing
 2065          *      break processing
 2066          *      received exception processing
 2067          */
 2068         opt = 0;
 2069         if (iflag & IGNCR)
 2070                 opt |= CD1400_COR4_IGNCR;
 2071 #ifdef Smarts
 2072         /*
 2073          * we need a new ttyinput() for this, as we don't want to
 2074          * have ICRNL && INLCR being done in both layers, or to have
 2075          * synchronisation problems
 2076          */
 2077         if (iflag & ICRNL)
 2078                 opt |= CD1400_COR4_ICRNL;
 2079         if (iflag & INLCR)
 2080                 opt |= CD1400_COR4_INLCR;
 2081 #endif
 2082         if (iflag & IGNBRK)
 2083                 opt |= CD1400_COR4_IGNBRK | CD1400_COR4_NOBRKINT;
 2084         /*
 2085          * The `-ignbrk -brkint parmrk' case is not handled by the hardware,
 2086          * so only tell the hardware about -brkint if -parmrk.
 2087          */
 2088         if (!(iflag & (BRKINT | PARMRK)))
 2089                 opt |= CD1400_COR4_NOBRKINT;
 2090 #if 0
 2091         /* XXX using this "intelligence" breaks reporting of overruns. */
 2092         if (iflag & IGNPAR)
 2093                 opt |= CD1400_COR4_PFO_DISCARD;
 2094         else {
 2095                 if (iflag & PARMRK)
 2096                         opt |= CD1400_COR4_PFO_ESC;
 2097                 else
 2098                         opt |= CD1400_COR4_PFO_NUL;
 2099         }
 2100 #else
 2101         opt |= CD1400_COR4_PFO_EXCEPTION;
 2102 #endif
 2103         cd_setreg(com, CD1400_COR4, opt);
 2104 
 2105         /*
 2106          * set channel option register 5 -
 2107          */
 2108         opt = 0;
 2109         if (iflag & ISTRIP)
 2110                 opt |= CD1400_COR5_ISTRIP;
 2111         if (t->c_iflag & IEXTEN)
 2112                 /* enable LNEXT (e.g. ctrl-v quoting) handling */
 2113                 opt |= CD1400_COR5_LNEXT;
 2114 #ifdef Smarts
 2115         if (t->c_oflag & ONLCR)
 2116                 opt |= CD1400_COR5_ONLCR;
 2117         if (t->c_oflag & OCRNL)
 2118                 opt |= CD1400_COR5_OCRNL;
 2119 #endif
 2120         cd_setreg(com, CD1400_COR5, opt);
 2121 
 2122         /*
 2123          * We always generate modem status change interrupts for CD changes.
 2124          * Among other things, this is necessary to track TS_CARR_ON for
 2125          * pstat to print even when the driver doesn't care.  CD changes
 2126          * should be rare so interrupts for them are not worth extra code to
 2127          * avoid.  We avoid interrupts for other modem status changes (except
 2128          * for CTS changes when SOFT_CTS_OFLOW is configured) since this is
 2129          * simplest and best.
 2130          */
 2131 
 2132         /*
 2133          * set modem change option register 1
 2134          *      generate modem interrupts on which 1 -> 0 input transitions
 2135          *      also controls auto-DTR output flow-control, which we don't use
 2136          */
 2137         opt = CD1400_MCOR1_CDzd;
 2138 #ifdef SOFT_CTS_OFLOW
 2139         if (cflag & CCTS_OFLOW)
 2140                 opt |= CD1400_MCOR1_CTSzd;
 2141 #endif
 2142         cd_setreg(com, CD1400_MCOR1, opt);
 2143 
 2144         /*
 2145          * set modem change option register 2
 2146          *      generate modem interrupts on specific 0 -> 1 input transitions
 2147          */
 2148         opt = CD1400_MCOR2_CDod;
 2149 #ifdef SOFT_CTS_OFLOW
 2150         if (cflag & CCTS_OFLOW)
 2151                 opt |= CD1400_MCOR2_CTSod;
 2152 #endif
 2153         cd_setreg(com, CD1400_MCOR2, opt);
 2154 
 2155         /*
 2156          * XXX should have done this long ago, but there is too much state
 2157          * to change all atomically.
 2158          */
 2159         critical_enter();
 2160         COM_LOCK();
 2161 
 2162         com->state &= ~CS_TTGO;
 2163         if (!(tp->t_state & TS_TTSTOP))
 2164                 com->state |= CS_TTGO;
 2165         if (cflag & CRTS_IFLOW) {
 2166                 com->state |= CS_RTS_IFLOW;
 2167                 /*
 2168                  * If CS_RTS_IFLOW just changed from off to on, the change
 2169                  * needs to be propagated to MCR_RTS.  This isn't urgent,
 2170                  * so do it later by calling comstart() instead of repeating
 2171                  * a lot of code from comstart() here.
 2172                  */
 2173         } else if (com->state & CS_RTS_IFLOW) {
 2174                 com->state &= ~CS_RTS_IFLOW;
 2175                 /*
 2176                  * CS_RTS_IFLOW just changed from on to off.  Force MCR_RTS
 2177                  * on here, since comstart() won't do it later.
 2178                  */
 2179 #if 0
 2180                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
 2181 #else
 2182                 cd_setreg(com, com->mcr_rts_reg,
 2183                           com->mcr_image |= com->mcr_rts);
 2184 #endif
 2185         }
 2186 
 2187         /*
 2188          * Set up state to handle output flow control.
 2189          * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
 2190          * Now has 10+ msec latency, while CTS flow has 50- usec latency.
 2191          */
 2192         com->state |= CS_ODEVREADY;
 2193 #ifdef SOFT_CTS_OFLOW
 2194         com->state &= ~CS_CTS_OFLOW;
 2195         if (cflag & CCTS_OFLOW) {
 2196                 com->state |= CS_CTS_OFLOW;
 2197                 if (!(com->last_modem_status & MSR_CTS))
 2198                         com->state &= ~CS_ODEVREADY;
 2199         }
 2200 #endif
 2201         /* XXX shouldn't call functions while intrs are disabled. */
 2202         disc_optim(tp, t, com);
 2203 #if 0
 2204         /*
 2205          * Recover from fiddling with CS_TTGO.  We used to call siointr1()
 2206          * unconditionally, but that defeated the careful discarding of
 2207          * stale input in sioopen().
 2208          */
 2209         if (com->state >= (CS_BUSY | CS_TTGO))
 2210                 siointr1(com);
 2211 #endif
 2212         if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
 2213                 if (!(com->intr_enable & CD1400_SRER_TXRDY))
 2214                         cd_setreg(com, CD1400_SRER,
 2215                                   com->intr_enable
 2216                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
 2217                                     | CD1400_SRER_TXRDY);
 2218         } else {
 2219                 if (com->intr_enable & CD1400_SRER_TXRDY)
 2220                         cd_setreg(com, CD1400_SRER,
 2221                                   com->intr_enable
 2222                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
 2223                                     | CD1400_SRER_TXMPTY);
 2224         }
 2225 
 2226         COM_UNLOCK();
 2227         critical_exit();
 2228         splx(s);
 2229         comstart(tp);
 2230         if (com->ibufold != NULL) {
 2231                 free(com->ibufold, M_DEVBUF);
 2232                 com->ibufold = NULL;
 2233         }
 2234         return (0);
 2235 }
 2236 
 2237 static int
 2238 siosetwater(com, speed)
 2239         struct com_s    *com;
 2240         speed_t         speed;
 2241 {
 2242         int             cp4ticks;
 2243         u_char          *ibuf;
 2244         int             ibufsize;
 2245         struct tty      *tp;
 2246 
 2247         /*
 2248          * Make the buffer size large enough to handle a softtty interrupt
 2249          * latency of about 2 ticks without loss of throughput or data
 2250          * (about 3 ticks if input flow control is not used or not honoured,
 2251          * but a bit less for CS5-CS7 modes).
 2252          */
 2253         cp4ticks = speed / 10 / hz * 4;
 2254         for (ibufsize = 128; ibufsize < cp4ticks;)
 2255                 ibufsize <<= 1;
 2256         if (ibufsize == com->ibufsize) {
 2257                 return (0);
 2258         }
 2259 
 2260         /*
 2261          * Allocate input buffer.  The extra factor of 2 in the size is
 2262          * to allow for an error byte for each input byte.
 2263          */
 2264         ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT);
 2265         if (ibuf == NULL) {
 2266                 return (ENOMEM);
 2267         }
 2268 
 2269         /* Initialize non-critical variables. */
 2270         com->ibufold = com->ibuf;
 2271         com->ibufsize = ibufsize;
 2272         tp = com->tp;
 2273         if (tp != NULL) {
 2274                 tp->t_ififosize = 2 * ibufsize;
 2275                 tp->t_ispeedwat = (speed_t)-1;
 2276                 tp->t_ospeedwat = (speed_t)-1;
 2277         }
 2278 
 2279         /*
 2280          * Read current input buffer, if any.  Continue with interrupts
 2281          * disabled.
 2282          */
 2283         critical_enter();
 2284         COM_LOCK();
 2285         if (com->iptr != com->ibuf)
 2286                 sioinput(com);
 2287 
 2288         /*-
 2289          * Initialize critical variables, including input buffer watermarks.
 2290          * The external device is asked to stop sending when the buffer
 2291          * exactly reaches high water, or when the high level requests it.
 2292          * The high level is notified immediately (rather than at a later
 2293          * clock tick) when this watermark is reached.
 2294          * The buffer size is chosen so the watermark should almost never
 2295          * be reached.
 2296          * The low watermark is invisibly 0 since the buffer is always
 2297          * emptied all at once.
 2298          */
 2299         com->iptr = com->ibuf = ibuf;
 2300         com->ibufend = ibuf + ibufsize;
 2301         com->ierroff = ibufsize;
 2302         com->ihighwater = ibuf + 3 * ibufsize / 4;
 2303 
 2304         COM_UNLOCK();
 2305         critical_exit();
 2306         return (0);
 2307 }
 2308 
 2309 static void
 2310 comstart(tp)
 2311         struct tty      *tp;
 2312 {
 2313         struct com_s    *com;
 2314         int             s;
 2315 #ifdef CyDebug
 2316         bool_t          started;
 2317 #endif
 2318         int             unit;
 2319 
 2320         unit = DEV_TO_UNIT(tp->t_dev);
 2321         com = com_addr(unit);
 2322         s = spltty();
 2323 
 2324 #ifdef CyDebug
 2325         ++com->start_count;
 2326         started = FALSE;
 2327 #endif
 2328 
 2329         critical_enter();
 2330         COM_LOCK();
 2331         if (tp->t_state & TS_TTSTOP) {
 2332                 com->state &= ~CS_TTGO;
 2333                 if (com->intr_enable & CD1400_SRER_TXRDY)
 2334                         cd_setreg(com, CD1400_SRER,
 2335                                   com->intr_enable
 2336                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
 2337                                     | CD1400_SRER_TXMPTY);
 2338         } else {
 2339                 com->state |= CS_TTGO;
 2340                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)
 2341                     && !(com->intr_enable & CD1400_SRER_TXRDY))
 2342                         cd_setreg(com, CD1400_SRER,
 2343                                   com->intr_enable
 2344                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
 2345                                     | CD1400_SRER_TXRDY);
 2346         }
 2347         if (tp->t_state & TS_TBLOCK) {
 2348                 if (com->mcr_image & com->mcr_rts && com->state & CS_RTS_IFLOW)
 2349 #if 0
 2350                         outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
 2351 #else
 2352                         cd_setreg(com, com->mcr_rts_reg,
 2353                                   com->mcr_image &= ~com->mcr_rts);
 2354 #endif
 2355         } else {
 2356                 if (!(com->mcr_image & com->mcr_rts)
 2357                     && com->iptr < com->ihighwater
 2358                     && com->state & CS_RTS_IFLOW)
 2359 #if 0
 2360                         outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
 2361 #else
 2362                         cd_setreg(com, com->mcr_rts_reg,
 2363                                   com->mcr_image |= com->mcr_rts);
 2364 #endif
 2365         }
 2366         COM_UNLOCK();
 2367         critical_exit();
 2368         if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
 2369                 ttwwakeup(tp);
 2370                 splx(s);
 2371                 return;
 2372         }
 2373         if (tp->t_outq.c_cc != 0) {
 2374                 struct lbq      *qp;
 2375                 struct lbq      *next;
 2376 
 2377                 if (!com->obufs[0].l_queued) {
 2378 #ifdef CyDebug
 2379                         started = TRUE;
 2380 #endif
 2381                         com->obufs[0].l_tail
 2382                             = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
 2383                                                   sizeof com->obuf1);
 2384                         com->obufs[0].l_next = NULL;
 2385                         com->obufs[0].l_queued = TRUE;
 2386                         critical_enter();
 2387                         COM_LOCK();
 2388                         if (com->state & CS_BUSY) {
 2389                                 qp = com->obufq.l_next;
 2390                                 while ((next = qp->l_next) != NULL)
 2391                                         qp = next;
 2392                                 qp->l_next = &com->obufs[0];
 2393                         } else {
 2394                                 com->obufq.l_head = com->obufs[0].l_head;
 2395                                 com->obufq.l_tail = com->obufs[0].l_tail;
 2396                                 com->obufq.l_next = &com->obufs[0];
 2397                                 com->state |= CS_BUSY;
 2398                                 if (com->state >= (CS_BUSY | CS_TTGO
 2399                                                    | CS_ODEVREADY))
 2400                                         cd_setreg(com, CD1400_SRER,
 2401                                                   com->intr_enable
 2402                                                   = (com->intr_enable
 2403                                                     & ~CD1400_SRER_TXMPTY)
 2404                                                     | CD1400_SRER_TXRDY);
 2405                         }
 2406                         COM_UNLOCK();
 2407                         critical_exit();
 2408                 }
 2409                 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
 2410 #ifdef CyDebug
 2411                         started = TRUE;
 2412 #endif
 2413                         com->obufs[1].l_tail
 2414                             = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
 2415                                                   sizeof com->obuf2);
 2416                         com->obufs[1].l_next = NULL;
 2417                         com->obufs[1].l_queued = TRUE;
 2418                         critical_enter();
 2419                         COM_LOCK();
 2420                         if (com->state & CS_BUSY) {
 2421                                 qp = com->obufq.l_next;
 2422                                 while ((next = qp->l_next) != NULL)
 2423                                         qp = next;
 2424                                 qp->l_next = &com->obufs[1];
 2425                         } else {
 2426                                 com->obufq.l_head = com->obufs[1].l_head;
 2427                                 com->obufq.l_tail = com->obufs[1].l_tail;
 2428                                 com->obufq.l_next = &com->obufs[1];
 2429                                 com->state |= CS_BUSY;
 2430                                 if (com->state >= (CS_BUSY | CS_TTGO
 2431                                                    | CS_ODEVREADY))
 2432                                         cd_setreg(com, CD1400_SRER,
 2433                                                   com->intr_enable
 2434                                                   = (com->intr_enable
 2435                                                     & ~CD1400_SRER_TXMPTY)
 2436                                                     | CD1400_SRER_TXRDY);
 2437                         }
 2438                         COM_UNLOCK();
 2439                         critical_exit();
 2440                 }
 2441                 tp->t_state |= TS_BUSY;
 2442         }
 2443 #ifdef CyDebug
 2444         if (started)
 2445                 ++com->start_real;
 2446 #endif
 2447 #if 0
 2448         critical_enter();
 2449         COM_LOCK();
 2450         if (com->state >= (CS_BUSY | CS_TTGO))
 2451                 siointr1(com);  /* fake interrupt to start output */
 2452         COM_UNLOCK();
 2453         critical_exit();
 2454 #endif
 2455         ttwwakeup(tp);
 2456         splx(s);
 2457 }
 2458 
 2459 static void
 2460 comstop(tp, rw)
 2461         struct tty      *tp;
 2462         int             rw;
 2463 {
 2464         struct com_s    *com;
 2465         bool_t          wakeup_etc;
 2466 
 2467         com = com_addr(DEV_TO_UNIT(tp->t_dev));
 2468         wakeup_etc = FALSE;
 2469         critical_enter();
 2470         COM_LOCK();
 2471         if (rw & FWRITE) {
 2472                 com->obufs[0].l_queued = FALSE;
 2473                 com->obufs[1].l_queued = FALSE;
 2474                 if (com->extra_state & CSE_ODONE) {
 2475                         com_events -= LOTS_OF_EVENTS;
 2476                         com->extra_state &= ~CSE_ODONE;
 2477                         if (com->etc != ETC_NONE) {
 2478                                 if (com->etc == ETC_BREAK_ENDED)
 2479                                         com->etc = ETC_NONE;
 2480                                 wakeup_etc = TRUE;
 2481                         }
 2482                 }
 2483                 com->tp->t_state &= ~TS_BUSY;
 2484                 if (com->state & CS_ODONE)
 2485                         com_events -= LOTS_OF_EVENTS;
 2486                 com->state &= ~(CS_ODONE | CS_BUSY);
 2487         }
 2488         if (rw & FREAD) {
 2489                 /* XXX no way to reset only input fifo. */
 2490                 com_events -= (com->iptr - com->ibuf);
 2491                 com->iptr = com->ibuf;
 2492         }
 2493         COM_UNLOCK();
 2494         critical_exit();
 2495         if (wakeup_etc)
 2496                 wakeup(&com->etc);
 2497         if (rw & FWRITE && com->etc == ETC_NONE)
 2498                 cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
 2499         comstart(tp);
 2500 }
 2501 
 2502 static int
 2503 commctl(com, bits, how)
 2504         struct com_s    *com;
 2505         int             bits;
 2506         int             how;
 2507 {
 2508         int     mcr;
 2509         int     msr;
 2510 
 2511         if (how == DMGET) {
 2512                 if (com->channel_control & CD1400_CCR_RCVEN)
 2513                         bits |= TIOCM_LE;
 2514                 mcr = com->mcr_image;
 2515                 if (mcr & com->mcr_dtr)
 2516                         bits |= TIOCM_DTR;
 2517                 if (mcr & com->mcr_rts)
 2518                         /* XXX wired on for Cyclom-8Ys */
 2519                         bits |= TIOCM_RTS;
 2520 
 2521                 /*
 2522                  * We must read the modem status from the hardware because
 2523                  * we don't generate modem status change interrupts for all
 2524                  * changes, so com->prev_modem_status is not guaranteed to
 2525                  * be up to date.  This is safe, unlike for sio, because
 2526                  * reading the status register doesn't clear pending modem
 2527                  * status change interrupts.
 2528                  */
 2529                 msr = cd_getreg(com, CD1400_MSVR2);
 2530 
 2531                 if (msr & MSR_CTS)
 2532                         bits |= TIOCM_CTS;
 2533                 if (msr & MSR_DCD)
 2534                         bits |= TIOCM_CD;
 2535                 if (msr & MSR_DSR)
 2536                         bits |= TIOCM_DSR;
 2537                 if (msr & MSR_RI)
 2538                         /* XXX not connected except for Cyclom-16Y? */
 2539                         bits |= TIOCM_RI;
 2540                 return (bits);
 2541         }
 2542         mcr = 0;
 2543         if (bits & TIOCM_DTR)
 2544                 mcr |= com->mcr_dtr;
 2545         if (bits & TIOCM_RTS)
 2546                 mcr |= com->mcr_rts;
 2547         critical_enter();
 2548         COM_LOCK();
 2549         switch (how) {
 2550         case DMSET:
 2551                 com->mcr_image = mcr;
 2552                 cd_setreg(com, CD1400_MSVR1, mcr);
 2553                 cd_setreg(com, CD1400_MSVR2, mcr);
 2554                 break;
 2555         case DMBIS:
 2556                 com->mcr_image = mcr = com->mcr_image | mcr;
 2557                 cd_setreg(com, CD1400_MSVR1, mcr);
 2558                 cd_setreg(com, CD1400_MSVR2, mcr);
 2559                 break;
 2560         case DMBIC:
 2561                 com->mcr_image = mcr = com->mcr_image & ~mcr;
 2562                 cd_setreg(com, CD1400_MSVR1, mcr);
 2563                 cd_setreg(com, CD1400_MSVR2, mcr);
 2564                 break;
 2565         }
 2566         COM_UNLOCK();
 2567         critical_exit();
 2568         return (0);
 2569 }
 2570 
 2571 static void
 2572 siosettimeout()
 2573 {
 2574         struct com_s    *com;
 2575         bool_t          someopen;
 2576         int             unit;
 2577 
 2578         /*
 2579          * Set our timeout period to 1 second if no polled devices are open.
 2580          * Otherwise set it to max(1/200, 1/hz).
 2581          * Enable timeouts iff some device is open.
 2582          */
 2583         untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
 2584         sio_timeout = hz;
 2585         someopen = FALSE;
 2586         for (unit = 0; unit < NSIO; ++unit) {
 2587                 com = com_addr(unit);
 2588                 if (com != NULL && com->tp != NULL
 2589                     && com->tp->t_state & TS_ISOPEN) {
 2590                         someopen = TRUE;
 2591 #if 0
 2592                         if (com->poll || com->poll_output) {
 2593                                 sio_timeout = hz > 200 ? hz / 200 : 1;
 2594                                 break;
 2595                         }
 2596 #endif
 2597                 }
 2598         }
 2599         if (someopen) {
 2600                 sio_timeouts_until_log = hz / sio_timeout;
 2601                 sio_timeout_handle = timeout(comwakeup, (void *)NULL,
 2602                                              sio_timeout);
 2603         } else {
 2604                 /* Flush error messages, if any. */
 2605                 sio_timeouts_until_log = 1;
 2606                 comwakeup((void *)NULL);
 2607                 untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
 2608         }
 2609 }
 2610 
 2611 static void
 2612 comwakeup(chan)
 2613         void    *chan;
 2614 {
 2615         struct com_s    *com;
 2616         int             unit;
 2617 
 2618         sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout);
 2619 
 2620 #if 0
 2621         /*
 2622          * Recover from lost output interrupts.
 2623          * Poll any lines that don't use interrupts.
 2624          */
 2625         for (unit = 0; unit < NSIO; ++unit) {
 2626                 com = com_addr(unit);
 2627                 if (com != NULL
 2628                     && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
 2629                         critical_enter();
 2630                         COM_LOCK();
 2631                         siointr1(com);
 2632                         COM_UNLOCK();
 2633                         critical_exit();
 2634                 }
 2635         }
 2636 #endif
 2637 
 2638         /*
 2639          * Check for and log errors, but not too often.
 2640          */
 2641         if (--sio_timeouts_until_log > 0)
 2642                 return;
 2643         sio_timeouts_until_log = hz / sio_timeout;
 2644         for (unit = 0; unit < NSIO; ++unit) {
 2645                 int     errnum;
 2646 
 2647                 com = com_addr(unit);
 2648                 if (com == NULL)
 2649                         continue;
 2650                 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
 2651                         u_int   delta;
 2652                         u_long  total;
 2653 
 2654                         critical_enter();
 2655                         COM_LOCK();
 2656                         delta = com->delta_error_counts[errnum];
 2657                         com->delta_error_counts[errnum] = 0;
 2658                         COM_UNLOCK();
 2659                         critical_exit();
 2660                         if (delta == 0)
 2661                                 continue;
 2662                         total = com->error_counts[errnum] += delta;
 2663                         log(LOG_ERR, "cy%d: %u more %s%s (total %lu)\n",
 2664                             unit, delta, error_desc[errnum],
 2665                             delta == 1 ? "" : "s", total);
 2666                 }
 2667         }
 2668 }
 2669 
 2670 static void
 2671 disc_optim(tp, t, com)
 2672         struct tty      *tp;
 2673         struct termios  *t;
 2674         struct com_s    *com;
 2675 {
 2676 #ifndef SOFT_HOTCHAR
 2677         u_char  opt;
 2678 #endif
 2679 
 2680         /*
 2681          * XXX can skip a lot more cases if Smarts.  Maybe
 2682          * (IGNCR | ISTRIP | IXON) in c_iflag.  But perhaps we
 2683          * shouldn't skip if (TS_CNTTB | TS_LNCH) is set in t_state.
 2684          */
 2685         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
 2686             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
 2687             && (!(t->c_iflag & PARMRK)
 2688                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
 2689             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
 2690             && linesw[tp->t_line].l_rint == ttyinput)
 2691                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
 2692         else
 2693                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
 2694         com->hotchar = linesw[tp->t_line].l_hotchar;
 2695 #ifndef SOFT_HOTCHAR
 2696         opt = com->cor[2] & ~CD1400_COR3_SCD34;
 2697         if (com->hotchar != 0) {
 2698                 cd_setreg(com, CD1400_SCHR3, com->hotchar);
 2699                 cd_setreg(com, CD1400_SCHR4, com->hotchar);
 2700                 opt |= CD1400_COR3_SCD34;
 2701         }
 2702         if (opt != com->cor[2]) {
 2703                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
 2704                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | CD1400_CCR_COR3);
 2705         }
 2706 #endif
 2707 }
 2708 
 2709 #ifdef Smarts
 2710 /* standard line discipline input routine */
 2711 int
 2712 cyinput(c, tp)
 2713         int             c;
 2714         struct tty      *tp;
 2715 {
 2716         /* XXX duplicate ttyinput(), but without the IXOFF/IXON/ISTRIP/IPARMRK
 2717          * bits, as they are done by the CD1400.  Hardly worth the effort,
 2718          * given that high-throughput sessions are raw anyhow.
 2719          */
 2720 }
 2721 #endif /* Smarts */
 2722 
 2723 static int
 2724 comspeed(speed, cy_clock, prescaler_io)
 2725         speed_t speed;
 2726         u_long  cy_clock;
 2727         int     *prescaler_io;
 2728 {
 2729         int     actual;
 2730         int     error;
 2731         int     divider;
 2732         int     prescaler;
 2733         int     prescaler_unit;
 2734 
 2735         if (speed == 0)
 2736                 return (0);
 2737         if (speed < 0 || speed > 150000)
 2738                 return (-1);
 2739 
 2740         /* determine which prescaler to use */
 2741         for (prescaler_unit = 4, prescaler = 2048; prescaler_unit;
 2742                 prescaler_unit--, prescaler >>= 2) {
 2743                 if (cy_clock / prescaler / speed > 63)
 2744                         break;
 2745         }
 2746 
 2747         divider = (cy_clock / prescaler * 2 / speed + 1) / 2; /* round off */
 2748         if (divider > 255)
 2749                 divider = 255;
 2750         actual = cy_clock/prescaler/divider;
 2751 
 2752         /* 10 times error in percent: */
 2753         error = ((actual - (long)speed) * 2000 / (long)speed + 1) / 2;
 2754 
 2755         /* 3.0% max error tolerance */
 2756         if (error < -30 || error > 30)
 2757                 return (-1);
 2758 
 2759 #if 0
 2760         printf("prescaler = %d (%d)\n", prescaler, prescaler_unit);
 2761         printf("divider = %d (%x)\n", divider, divider);
 2762         printf("actual = %d\n", actual);
 2763         printf("error = %d\n", error);
 2764 #endif
 2765 
 2766         *prescaler_io = prescaler_unit;
 2767         return (divider);
 2768 }
 2769 
 2770 static void
 2771 cd1400_channel_cmd(com, cmd)
 2772         struct com_s    *com;
 2773         int             cmd;
 2774 {
 2775         cd1400_channel_cmd_wait(com);
 2776         cd_setreg(com, CD1400_CCR, cmd);
 2777         cd1400_channel_cmd_wait(com);
 2778 }
 2779 
 2780 static void
 2781 cd1400_channel_cmd_wait(com)
 2782         struct com_s    *com;
 2783 {
 2784         struct timeval  start;
 2785         struct timeval  tv;
 2786         long            usec;
 2787 
 2788         if (cd_getreg(com, CD1400_CCR) == 0)
 2789                 return;
 2790         microtime(&start);
 2791         for (;;) {
 2792                 if (cd_getreg(com, CD1400_CCR) == 0)
 2793                         return;
 2794                 microtime(&tv);
 2795                 usec = 1000000 * (tv.tv_sec - start.tv_sec) +
 2796                     tv.tv_usec - start.tv_usec;
 2797                 if (usec >= 5000) {
 2798                         log(LOG_ERR,
 2799                             "cy%d: channel command timeout (%ld usec)\n",
 2800                             com->unit, usec);
 2801                         return;
 2802                 }
 2803         }
 2804 }
 2805 
 2806 static void
 2807 cd_etc(com, etc)
 2808         struct com_s    *com;
 2809         int             etc;
 2810 {
 2811 
 2812         /*
 2813          * We can't change the hardware's ETC state while there are any
 2814          * characters in the tx fifo, since those characters would be
 2815          * interpreted as commands!  Unputting characters from the fifo
 2816          * is difficult, so we wait up to 12 character times for the fifo
 2817          * to drain.  The command will be delayed for up to 2 character
 2818          * times for the tx to become empty.  Unputting characters from
 2819          * the tx holding and shift registers is impossible, so we wait
 2820          * for the tx to become empty so that the command is sure to be
 2821          * executed soon after we issue it.
 2822          */
 2823         critical_enter();
 2824         COM_LOCK();
 2825         if (com->etc == etc)
 2826                 goto wait;
 2827         if ((etc == CD1400_ETC_SENDBREAK
 2828             && (com->etc == ETC_BREAK_STARTING
 2829                 || com->etc == ETC_BREAK_STARTED))
 2830             || (etc == CD1400_ETC_STOPBREAK
 2831                && (com->etc == ETC_BREAK_ENDING || com->etc == ETC_BREAK_ENDED
 2832                    || com->etc == ETC_NONE))) {
 2833                 COM_UNLOCK();
 2834                 critical_exit();
 2835                 return;
 2836         }
 2837         com->etc = etc;
 2838         cd_setreg(com, CD1400_SRER,
 2839                   com->intr_enable
 2840                   = (com->intr_enable & ~CD1400_SRER_TXRDY) | CD1400_SRER_TXMPTY);
 2841 wait:
 2842         COM_UNLOCK();
 2843         critical_exit();
 2844         while (com->etc == etc
 2845                && tsleep(&com->etc, TTIPRI | PCATCH, "cyetc", 0) == 0)
 2846                 continue;
 2847 }
 2848 
 2849 static int
 2850 cd_getreg(com, reg)
 2851         struct com_s    *com;
 2852         int             reg;
 2853 {
 2854         struct com_s    *basecom;
 2855         u_char  car;
 2856         int     cy_align;
 2857         register_t      eflags;
 2858         cy_addr iobase;
 2859         int     val;
 2860 
 2861         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
 2862         car = com->unit & CD1400_CAR_CHAN;
 2863         cy_align = com->cy_align;
 2864         iobase = com->iobase;
 2865         eflags = read_eflags();
 2866         critical_enter();
 2867         if (eflags & PSL_I)
 2868                 COM_LOCK();
 2869         if (basecom->car != car)
 2870                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
 2871         val = cd_inb(iobase, reg, cy_align);
 2872         if (eflags & PSL_I)
 2873                 COM_UNLOCK();
 2874         critical_exit();
 2875         return (val);
 2876 }
 2877 
 2878 static void
 2879 cd_setreg(com, reg, val)
 2880         struct com_s    *com;
 2881         int             reg;
 2882         int             val;
 2883 {
 2884         struct com_s    *basecom;
 2885         u_char  car;
 2886         int     cy_align;
 2887         register_t      eflags;
 2888         cy_addr iobase;
 2889 
 2890         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
 2891         car = com->unit & CD1400_CAR_CHAN;
 2892         cy_align = com->cy_align;
 2893         iobase = com->iobase;
 2894         eflags = read_eflags();
 2895         critical_enter();
 2896         if (eflags & PSL_I)
 2897                 COM_LOCK();
 2898         if (basecom->car != car)
 2899                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
 2900         cd_outb(iobase, reg, cy_align, val);
 2901         if (eflags & PSL_I)
 2902                 COM_UNLOCK();
 2903         critical_exit();
 2904 }
 2905 
 2906 #ifdef CyDebug
 2907 /* useful in ddb */
 2908 void
 2909 cystatus(unit)
 2910         int     unit;
 2911 {
 2912         struct com_s    *com;
 2913         cy_addr         iobase;
 2914         u_int           ocount;
 2915         struct tty      *tp;
 2916 
 2917         com = com_addr(unit);
 2918         printf("info for channel %d\n", unit);
 2919         printf("------------------\n");
 2920         printf("total cyclom service probes:\t%d\n", cy_svrr_probes);
 2921         printf("calls to upper layer:\t\t%d\n", cy_timeouts);
 2922         if (com == NULL)
 2923                 return;
 2924         iobase = com->iobase;
 2925         printf("\n");
 2926         printf("cd1400 base address:\\tt%p\n", iobase);
 2927         printf("saved channel_control:\t\t0x%02x\n", com->channel_control);
 2928         printf("saved cor1-3:\t\t\t0x%02x 0x%02x 0x%02x\n",
 2929                com->cor[0], com->cor[1], com->cor[2]);
 2930         printf("service request enable reg:\t0x%02x (0x%02x cached)\n",
 2931                cd_getreg(com, CD1400_SRER), com->intr_enable);
 2932         printf("service request register:\t0x%02x\n",
 2933                cd_inb(iobase, CD1400_SVRR, com->cy_align));
 2934         printf("modem status:\t\t\t0x%02x (0x%02x cached)\n",
 2935                cd_getreg(com, CD1400_MSVR2), com->prev_modem_status);
 2936         printf("rx/tx/mdm interrupt registers:\t0x%02x 0x%02x 0x%02x\n",
 2937                cd_inb(iobase, CD1400_RIR, com->cy_align),
 2938                cd_inb(iobase, CD1400_TIR, com->cy_align),
 2939                cd_inb(iobase, CD1400_MIR, com->cy_align));
 2940         printf("\n");
 2941         printf("com state:\t\t\t0x%02x\n", com->state);
 2942         printf("calls to comstart():\t\t%d (%d useful)\n",
 2943                com->start_count, com->start_real);
 2944         printf("rx buffer chars free:\t\t%d\n", com->iptr - com->ibuf);
 2945         ocount = 0;
 2946         if (com->obufs[0].l_queued)
 2947                 ocount += com->obufs[0].l_tail - com->obufs[0].l_head;
 2948         if (com->obufs[1].l_queued)
 2949                 ocount += com->obufs[1].l_tail - com->obufs[1].l_head;
 2950         printf("tx buffer chars:\t\t%u\n", ocount);
 2951         printf("received chars:\t\t\t%d\n", com->bytes_in);
 2952         printf("received exceptions:\t\t%d\n", com->recv_exception);
 2953         printf("modem signal deltas:\t\t%d\n", com->mdm);
 2954         printf("transmitted chars:\t\t%d\n", com->bytes_out);
 2955         printf("\n");
 2956         tp = com->tp;
 2957         if (tp != NULL) {
 2958                 printf("tty state:\t\t\t0x%08x\n", tp->t_state);
 2959                 printf(
 2960                 "upper layer queue lengths:\t%d raw, %d canon, %d output\n",
 2961                        tp->t_rawq.c_cc, tp->t_canq.c_cc, tp->t_outq.c_cc);
 2962         } else
 2963                 printf("tty state:\t\t\tclosed\n");
 2964 }
 2965 #endif /* CyDebug */

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