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/5.1/sys/i386/isa/cy.c 111821 2003-03-03 16:24:47Z phk $
   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/fcntl.h>
   75 #include <sys/interrupt.h>
   76 #include <sys/kernel.h>
   77 #include <sys/lock.h>
   78 #include <sys/malloc.h>
   79 #include <sys/mutex.h>
   80 #include <sys/syslog.h>
   81 #include <sys/tty.h>
   82 
   83 #include <machine/psl.h>
   84 
   85 #include <i386/isa/isa_device.h>
   86 #include <i386/isa/cyreg.h>
   87 #include <i386/isa/ic/cd1400.h>
   88 
   89 #ifndef COMPAT_OLDISA
   90 #error "The cy device requires the old isa compatibility shims"
   91 #endif
   92 
   93 #ifdef SMP
   94 
   95 #include <machine/smptests.h>                   /** xxx_LOCK */
   96 
   97 #ifdef USE_COMLOCK
   98 #define COM_LOCK()      mtx_lock_spin(&com_mtx)
   99 #define COM_UNLOCK()    mtx_unlock_spin(&com_mtx)
  100 #else
  101 #define COM_LOCK()
  102 #define COM_UNLOCK()
  103 #endif /* USE_COMLOCK */
  104 
  105 #else /* SMP */
  106 
  107 #define COM_LOCK()
  108 #define COM_UNLOCK()
  109 
  110 #endif /* SMP */
  111 
  112 extern struct mtx       com_mtx;
  113 
  114 /*
  115  * Dictionary so that I can name everything *sio* or *com* to compare with
  116  * sio.c.  There is also lots of ugly formatting and unnecessary ifdefs to
  117  * simplify the comparision.  These will go away.
  118  */
  119 #define LSR_BI          CD1400_RDSR_BREAK
  120 #define LSR_FE          CD1400_RDSR_FE
  121 #define LSR_OE          CD1400_RDSR_OE
  122 #define LSR_PE          CD1400_RDSR_PE
  123 #define MCR_DTR         CD1400_MSVR2_DTR
  124 #define MCR_RTS         CD1400_MSVR1_RTS
  125 #define MSR_CTS         CD1400_MSVR2_CTS
  126 #define MSR_DCD         CD1400_MSVR2_CD
  127 #define MSR_DSR         CD1400_MSVR2_DSR
  128 #define MSR_RI          CD1400_MSVR2_RI
  129 #define NSIO            (NCY * CY_MAX_PORTS)
  130 #define comconsole      cyconsole
  131 #define comdefaultrate  cydefaultrate
  132 #define com_events      cy_events
  133 #define comhardclose    cyhardclose
  134 #define commctl         cymctl
  135 #define comparam        cyparam
  136 #define comspeed        cyspeed
  137 #define comstart        cystart
  138 #define comwakeup       cywakeup
  139 #define p_com_addr      p_cy_addr
  140 #define sioattach       cyattach
  141 #define sioclose        cyclose
  142 #define siodriver       cydriver
  143 #define siodtrwakeup    cydtrwakeup
  144 #define sioinput        cyinput
  145 #define siointr         cyintr
  146 #define siointr1        cyintr1
  147 #define sioioctl        cyioctl
  148 #define sioopen         cyopen
  149 #define siopoll         cypoll
  150 #define sioprobe        cyprobe
  151 #define siosettimeout   cysettimeout
  152 #define siosetwater     cysetwater
  153 #define comstop         cystop
  154 #define siowrite        cywrite
  155 #define sio_ih          cy_ih
  156 #define sio_irec        cy_irec
  157 #define sio_timeout     cy_timeout
  158 #define sio_timeout_handle cy_timeout_handle
  159 #define sio_timeouts_until_log  cy_timeouts_until_log
  160 
  161 #define CY_MAX_PORTS            (CD1400_NO_OF_CHANNELS * CY_MAX_CD1400s)
  162 
  163 /* We encode the cyclom unit number (cyu) in spare bits in the IVR's. */
  164 #define CD1400_xIVR_CHAN_SHIFT  3
  165 #define CD1400_xIVR_CHAN        0x1F
  166 
  167 /*
  168  * ETC states.  com->etc may also contain a hardware ETC command value,
  169  * meaning that execution of that command is pending.
  170  */
  171 #define ETC_NONE                0       /* we depend on bzero() setting this */
  172 #define ETC_BREAK_STARTING      1
  173 #define ETC_BREAK_STARTED       2
  174 #define ETC_BREAK_ENDING        3
  175 #define ETC_BREAK_ENDED         4
  176 
  177 #define LOTS_OF_EVENTS  64      /* helps separate urgent events from input */
  178 
  179 #define CALLOUT_MASK            0x80
  180 #define CONTROL_MASK            0x60
  181 #define CONTROL_INIT_STATE      0x20
  182 #define CONTROL_LOCK_STATE      0x40
  183 #define DEV_TO_UNIT(dev)        (MINOR_TO_UNIT(minor(dev)))
  184 #define MINOR_MAGIC_MASK        (CALLOUT_MASK | CONTROL_MASK)
  185 /*
  186  * Not all of the magic is parametrized in the following macros.  16 and
  187  * 0xff are related to the bitfields in a udev_t.  CY_MAX_PORTS must be
  188  * ((0xff & ~MINOR_MAGIC_MASK) + 1) for things to work.
  189  */
  190 #define MINOR_TO_UNIT(mynor)    (((mynor) >> 16) * CY_MAX_PORTS \
  191                                  | (((mynor) & 0xff) & ~MINOR_MAGIC_MASK))
  192 #define UNIT_TO_MINOR(unit)     (((unit) / CY_MAX_PORTS) << 16 \
  193                                  | (((unit) & 0xff) & ~MINOR_MAGIC_MASK))
  194 
  195 /*
  196  * com state bits.
  197  * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
  198  * than the other bits so that they can be tested as a group without masking
  199  * off the low bits.
  200  *
  201  * The following com and tty flags correspond closely:
  202  *      CS_BUSY         = TS_BUSY (maintained by comstart(), siopoll() and
  203  *                                 comstop())
  204  *      CS_TTGO         = ~TS_TTSTOP (maintained by comparam() and comstart())
  205  *      CS_CTS_OFLOW    = CCTS_OFLOW (maintained by comparam())
  206  *      CS_RTS_IFLOW    = CRTS_IFLOW (maintained by comparam())
  207  * TS_FLUSH is not used.
  208  * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
  209  * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
  210  */
  211 #define CS_BUSY         0x80    /* output in progress */
  212 #define CS_TTGO         0x40    /* output not stopped by XOFF */
  213 #define CS_ODEVREADY    0x20    /* external device h/w ready (CTS) */
  214 #define CS_CHECKMSR     1       /* check of MSR scheduled */
  215 #define CS_CTS_OFLOW    2       /* use CTS output flow control */
  216 #define CS_DTR_OFF      0x10    /* DTR held off */
  217 #define CS_ODONE        4       /* output completed */
  218 #define CS_RTS_IFLOW    8       /* use RTS input flow control */
  219 #define CSE_ODONE       1       /* output transmitted */
  220 
  221 static  char const * const      error_desc[] = {
  222 #define CE_OVERRUN                      0
  223         "silo overflow",
  224 #define CE_INTERRUPT_BUF_OVERFLOW       1
  225         "interrupt-level buffer overflow",
  226 #define CE_TTY_BUF_OVERFLOW             2
  227         "tty-level buffer overflow",
  228 };
  229 
  230 #define CE_NTYPES                       3
  231 #define CE_RECORD(com, errnum)          (++(com)->delta_error_counts[errnum])
  232 
  233 /* types.  XXX - should be elsewhere */
  234 typedef u_char  bool_t;         /* boolean */
  235 typedef u_char volatile *cy_addr;
  236 
  237 /* queue of linear buffers */
  238 struct lbq {
  239         u_char  *l_head;        /* next char to process */
  240         u_char  *l_tail;        /* one past the last char to process */
  241         struct lbq *l_next;     /* next in queue */
  242         bool_t  l_queued;       /* nonzero if queued */
  243 };
  244 
  245 /* com device structure */
  246 struct com_s {
  247         u_char  state;          /* miscellaneous flag bits */
  248         bool_t  active_out;     /* nonzero if the callout device is open */
  249 #if 0
  250         u_char  cfcr_image;     /* copy of value written to CFCR */
  251 #endif
  252         u_char  etc;            /* pending Embedded Transmit Command */
  253         u_char  extra_state;    /* more flag bits, separate for order trick */
  254 #if 0
  255         u_char  fifo_image;     /* copy of value written to FIFO */
  256 #endif
  257         u_char  gfrcr_image;    /* copy of value read from GFRCR */
  258 #if 0
  259         bool_t  hasfifo;        /* nonzero for 16550 UARTs */
  260         bool_t  loses_outints;  /* nonzero if device loses output interrupts */
  261 #endif
  262         u_char  mcr_dtr;        /* MCR bit that is wired to DTR */
  263         u_char  mcr_image;      /* copy of value written to MCR */
  264         u_char  mcr_rts;        /* MCR bit that is wired to RTS */
  265 #if 0
  266 #ifdef COM_MULTIPORT
  267         bool_t  multiport;      /* is this unit part of a multiport device? */
  268 #endif /* COM_MULTIPORT */
  269         bool_t  no_irq;         /* nonzero if irq is not attached */
  270         bool_t  poll;           /* nonzero if polling is required */
  271         bool_t  poll_output;    /* nonzero if polling for output is required */
  272 #endif
  273         int     unit;           /* unit number */
  274         int     dtr_wait;       /* time to hold DTR down on close (* 1/hz) */
  275 #if 0
  276         u_int   tx_fifo_size;
  277 #endif
  278         u_int   wopeners;       /* # processes waiting for DCD in open() */
  279 
  280         /*
  281          * The high level of the driver never reads status registers directly
  282          * because there would be too many side effects to handle conveniently.
  283          * Instead, it reads copies of the registers stored here by the
  284          * interrupt handler.
  285          */
  286         u_char  last_modem_status;      /* last MSR read by intr handler */
  287         u_char  prev_modem_status;      /* last MSR handled by high level */
  288 
  289         u_char  hotchar;        /* ldisc-specific char to be handled ASAP */
  290         u_char  *ibuf;          /* start of input buffer */
  291         u_char  *ibufend;       /* end of input buffer */
  292         u_char  *ibufold;       /* old input buffer, to be freed */
  293         u_char  *ihighwater;    /* threshold in input buffer */
  294         u_char  *iptr;          /* next free spot in input buffer */
  295         int     ibufsize;       /* size of ibuf (not include error bytes) */
  296         int     ierroff;        /* offset of error bytes in ibuf */
  297 
  298         struct lbq      obufq;  /* head of queue of output buffers */
  299         struct lbq      obufs[2];       /* output buffers */
  300 
  301         int     cy_align;       /* index for register alignment */
  302         cy_addr cy_iobase;      /* base address of this port's cyclom */
  303         cy_addr iobase;         /* base address of this port's cd1400 */
  304         int     mcr_rts_reg;    /* cd1400 reg number of reg holding mcr_rts */
  305 
  306         struct tty      *tp;    /* cross reference */
  307 
  308         /* Initial state. */
  309         struct termios  it_in;  /* should be in struct tty */
  310         struct termios  it_out;
  311 
  312         /* Lock state. */
  313         struct termios  lt_in;  /* should be in struct tty */
  314         struct termios  lt_out;
  315 
  316         bool_t  do_timestamp;
  317         bool_t  do_dcd_timestamp;
  318         struct timeval  timestamp;
  319         struct timeval  dcd_timestamp;
  320 
  321         u_long  bytes_in;       /* statistics */
  322         u_long  bytes_out;
  323         u_int   delta_error_counts[CE_NTYPES];
  324         u_long  error_counts[CE_NTYPES];
  325 
  326         u_int   recv_exception; /* exception chars received */
  327         u_int   mdm;            /* modem signal changes */
  328 #ifdef CyDebug
  329         u_int   start_count;    /* no. of calls to comstart() */
  330         u_int   start_real;     /* no. of calls that did something */
  331 #endif
  332         u_char  car;            /* CD1400 CAR shadow (if first unit in cd) */
  333         u_char  channel_control;/* CD1400 CCR control command shadow */
  334         u_char  cor[3];         /* CD1400 COR1-3 shadows */
  335         u_char  intr_enable;    /* CD1400 SRER shadow */
  336 
  337         /*
  338          * Data area for output buffers.  Someday we should build the output
  339          * buffer queue without copying data.
  340          */
  341         u_char  obuf1[256];
  342         u_char  obuf2[256];
  343 };
  344 
  345 /* PCI driver entry point. */
  346 int     cyattach_common(cy_addr cy_iobase, int cy_align);
  347 ointhand2_t     siointr;
  348 
  349 static  int     cy_units(cy_addr cy_iobase, int cy_align);
  350 static  int     sioattach(struct isa_device *dev);
  351 static  void    cd1400_channel_cmd(struct com_s *com, int cmd);
  352 static  void    cd1400_channel_cmd_wait(struct com_s *com);
  353 static  void    cd_etc(struct com_s *com, int etc);
  354 static  int     cd_getreg(struct com_s *com, int reg);
  355 static  void    cd_setreg(struct com_s *com, int reg, int val);
  356 static  timeout_t siodtrwakeup;
  357 static  void    comhardclose(struct com_s *com);
  358 static  void    sioinput(struct com_s *com);
  359 #if 0
  360 static  void    siointr1(struct com_s *com);
  361 #endif
  362 static  int     commctl(struct com_s *com, int bits, int how);
  363 static  int     comparam(struct tty *tp, struct termios *t);
  364 static  void    siopoll(void *arg);
  365 static  int     sioprobe(struct isa_device *dev);
  366 static  void    siosettimeout(void);
  367 static  int     siosetwater(struct com_s *com, speed_t speed);
  368 static  int     comspeed(speed_t speed, u_long cy_clock, int *prescaler_io);
  369 static  void    comstart(struct tty *tp);
  370 static  void    comstop(struct tty *tp, int rw);
  371 static  timeout_t comwakeup;
  372 static  void    disc_optim(struct tty *tp, struct termios *t,
  373                     struct com_s *com);
  374 
  375 #ifdef CyDebug
  376 void    cystatus(int unit);
  377 #endif
  378 
  379 static char driver_name[] = "cy";
  380 
  381 /* table and macro for fast conversion from a unit number to its com struct */
  382 static  struct com_s    *p_com_addr[NSIO];
  383 #define com_addr(unit)  (p_com_addr[unit])
  384 
  385 struct isa_driver       siodriver = {
  386         INTR_TYPE_TTY | INTR_FAST,
  387         sioprobe,
  388         sioattach,
  389         driver_name
  390 };
  391 COMPAT_ISA_DRIVER(cy, cydriver);        /* XXX */
  392 
  393 static  d_open_t        sioopen;
  394 static  d_close_t       sioclose;
  395 static  d_write_t       siowrite;
  396 static  d_ioctl_t       sioioctl;
  397 
  398 #define CDEV_MAJOR      48
  399 static struct cdevsw sio_cdevsw = {
  400         .d_open =       sioopen,
  401         .d_close =      sioclose,
  402         .d_read =       ttyread,
  403         .d_write =      siowrite,
  404         .d_ioctl =      sioioctl,
  405         .d_poll =       ttypoll,
  406         .d_name =       driver_name,
  407         .d_maj =        CDEV_MAJOR,
  408         .d_flags =      D_TTY,
  409         .d_kqfilter =   ttykqfilter,
  410 };
  411 
  412 static  int     comconsole = -1;
  413 static  speed_t comdefaultrate = TTYDEF_SPEED;
  414 static  u_int   com_events;     /* input chars + weighted output completions */
  415 static  void    *sio_ih;
  416 static  int     sio_timeout;
  417 static  int     sio_timeouts_until_log;
  418 static  struct  callout_handle sio_timeout_handle
  419     = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle);
  420 
  421 #ifdef CyDebug
  422 static  u_int   cd_inbs;
  423 static  u_int   cy_inbs;
  424 static  u_int   cd_outbs;
  425 static  u_int   cy_outbs;
  426 static  u_int   cy_svrr_probes;
  427 static  u_int   cy_timeouts;
  428 #endif
  429 
  430 static  int     cy_chip_offset[] = {
  431         0x0000, 0x0400, 0x0800, 0x0c00, 0x0200, 0x0600, 0x0a00, 0x0e00,
  432 };
  433 static  int     cy_nr_cd1400s[NCY];
  434 static  int     cy_total_devices;
  435 #undef  RxFifoThreshold
  436 static  int     volatile RxFifoThreshold = (CD1400_RX_FIFO_SIZE / 2);
  437 
  438 static int
  439 sioprobe(dev)
  440         struct isa_device       *dev;
  441 {
  442         cy_addr iobase;
  443 
  444         iobase = (cy_addr)dev->id_maddr;
  445 
  446         /* Cyclom-16Y hardware reset (Cyclom-8Ys don't care) */
  447         cy_inb(iobase, CY16_RESET, 0);  /* XXX? */
  448         DELAY(500);     /* wait for the board to get its act together */
  449 
  450         /* this is needed to get the board out of reset */
  451         cy_outb(iobase, CY_CLEAR_INTR, 0, 0);
  452         DELAY(500);
  453 
  454         return (cy_units(iobase, 0) == 0 ? 0 : -1);
  455 }
  456 
  457 static int
  458 cy_units(cy_iobase, cy_align)
  459         cy_addr cy_iobase;
  460         int     cy_align;
  461 {
  462         int     cyu;
  463         u_char  firmware_version;
  464         int     i;
  465         cy_addr iobase;
  466 
  467         for (cyu = 0; cyu < CY_MAX_CD1400s; ++cyu) {
  468                 iobase = cy_iobase + (cy_chip_offset[cyu] << cy_align);
  469 
  470                 /* wait for chip to become ready for new command */
  471                 for (i = 0; i < 10; i++) {
  472                         DELAY(50);
  473                         if (!cd_inb(iobase, CD1400_CCR, cy_align))
  474                                 break;
  475                 }
  476 
  477                 /* clear the GFRCR register */
  478                 cd_outb(iobase, CD1400_GFRCR, cy_align, 0);
  479 
  480                 /* issue a reset command */
  481                 cd_outb(iobase, CD1400_CCR, cy_align,
  482                         CD1400_CCR_CMDRESET | CD1400_CCR_FULLRESET);
  483 
  484                 /* XXX bogus initialization to avoid a gcc bug/warning. */
  485                 firmware_version = 0;
  486 
  487                 /* wait for the CD1400 to initialize itself */
  488                 for (i = 0; i < 200; i++) {
  489                         DELAY(50);
  490 
  491                         /* retrieve firmware version */
  492                         firmware_version = cd_inb(iobase, CD1400_GFRCR,
  493                                                   cy_align);
  494                         if ((firmware_version & 0xf0) == 0x40)
  495                                 break;
  496                 }
  497 
  498                 /*
  499                  * Anything in the 0x40-0x4F range is fine.
  500                  * If one CD1400 is bad then we don't support higher
  501                  * numbered good ones on this board.
  502                  */
  503                 if ((firmware_version & 0xf0) != 0x40)
  504                         break;
  505         }
  506         return (cyu);
  507 }
  508 
  509 static int
  510 sioattach(isdp)
  511         struct isa_device       *isdp;
  512 {
  513         int     adapter;
  514 
  515         adapter = cyattach_common((cy_addr) isdp->id_maddr, 0);
  516         if (adapter < 0)
  517                 return (0);
  518 
  519         /*
  520          * XXX
  521          * This kludge is to allow ISA/PCI device specifications in the
  522          * kernel config file to be in any order.
  523          */
  524         if (isdp->id_unit != adapter) {
  525                 printf("cy%d: attached as cy%d\n", isdp->id_unit, adapter);
  526                 isdp->id_unit = adapter;        /* XXX */
  527         }
  528         isdp->id_ointr = siointr;
  529         /* isdp->id_ri_flags |= RI_FAST; XXX unimplemented - use newbus! */
  530         return (1);
  531 }
  532 
  533 int
  534 cyattach_common(cy_iobase, cy_align)
  535         cy_addr cy_iobase;
  536         int     cy_align;
  537 {
  538         int     adapter;
  539         int     cyu;
  540         u_char  firmware_version;
  541         cy_addr iobase;
  542         int     minorbase;
  543         int     ncyu;
  544         int     unit;
  545 
  546         adapter = cy_total_devices;
  547         if ((u_int)adapter >= NCY) {
  548                 printf(
  549         "cy%d: can't attach adapter: insufficient cy devices configured\n",
  550                        adapter);
  551                 return (-1);
  552         }
  553         ncyu = cy_units(cy_iobase, cy_align);
  554         if (ncyu == 0)
  555                 return (-1);
  556         cy_nr_cd1400s[adapter] = ncyu;
  557         cy_total_devices++;
  558 
  559         unit = adapter * CY_MAX_PORTS;
  560         for (cyu = 0; cyu < ncyu; ++cyu) {
  561                 int     cdu;
  562 
  563                 iobase = (cy_addr) (cy_iobase
  564                                     + (cy_chip_offset[cyu] << cy_align));
  565                 firmware_version = cd_inb(iobase, CD1400_GFRCR, cy_align);
  566 
  567                 /* Set up a receive timeout period of than 1+ ms. */
  568                 cd_outb(iobase, CD1400_PPR, cy_align,
  569                         howmany(CY_CLOCK(firmware_version)
  570                                 / CD1400_PPR_PRESCALER, 1000));
  571 
  572                 for (cdu = 0; cdu < CD1400_NO_OF_CHANNELS; ++cdu, ++unit) {
  573                         struct com_s    *com;
  574                         int             s;
  575 
  576         com = malloc(sizeof *com, M_DEVBUF, M_NOWAIT | M_ZERO);
  577         if (com == NULL)
  578                 break;
  579         com->unit = unit;
  580                         com->gfrcr_image = firmware_version;
  581                         if (CY_RTS_DTR_SWAPPED(firmware_version)) {
  582                                 com->mcr_dtr = MCR_RTS;
  583                                 com->mcr_rts = MCR_DTR;
  584                                 com->mcr_rts_reg = CD1400_MSVR2;
  585                         } else {
  586                                 com->mcr_dtr = MCR_DTR;
  587                                 com->mcr_rts = MCR_RTS;
  588                                 com->mcr_rts_reg = CD1400_MSVR1;
  589                         }
  590         com->dtr_wait = 3 * hz;
  591         com->obufs[0].l_head = com->obuf1;
  592         com->obufs[1].l_head = com->obuf2;
  593 
  594                         com->cy_align = cy_align;
  595                         com->cy_iobase = cy_iobase;
  596         com->iobase = iobase;
  597                         com->car = ~CD1400_CAR_CHAN;
  598 
  599         /*
  600          * We don't use all the flags from <sys/ttydefaults.h> since they
  601          * are only relevant for logins.  It's important to have echo off
  602          * initially so that the line doesn't start blathering before the
  603          * echo flag can be turned off.
  604          */
  605         com->it_in.c_iflag = 0;
  606         com->it_in.c_oflag = 0;
  607         com->it_in.c_cflag = TTYDEF_CFLAG;
  608         com->it_in.c_lflag = 0;
  609         if (unit == comconsole) {
  610                 com->it_in.c_iflag = TTYDEF_IFLAG;
  611                 com->it_in.c_oflag = TTYDEF_OFLAG;
  612                 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
  613                 com->it_in.c_lflag = TTYDEF_LFLAG;
  614                 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL;
  615         }
  616         if (siosetwater(com, com->it_in.c_ispeed) != 0) {
  617                 free(com, M_DEVBUF);
  618                 return (0);
  619         }
  620         termioschars(&com->it_in);
  621         com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
  622         com->it_out = com->it_in;
  623 
  624         s = spltty();
  625         com_addr(unit) = com;
  626         splx(s);
  627 
  628         if (sio_ih == NULL) {
  629                 swi_add(&tty_ithd, "tty:cy", siopoll, NULL, SWI_TTY, 0,
  630                     &sio_ih);
  631         }
  632         minorbase = UNIT_TO_MINOR(unit);
  633         make_dev(&sio_cdevsw, minorbase,
  634                 UID_ROOT, GID_WHEEL, 0600, "ttyc%r%r", adapter,
  635                 unit % CY_MAX_PORTS);
  636         make_dev(&sio_cdevsw, minorbase | CONTROL_INIT_STATE,
  637                 UID_ROOT, GID_WHEEL, 0600, "ttyic%r%r", adapter,
  638                 unit % CY_MAX_PORTS);
  639         make_dev(&sio_cdevsw, minorbase | CONTROL_LOCK_STATE,
  640                 UID_ROOT, GID_WHEEL, 0600, "ttylc%r%r", adapter,
  641                 unit % CY_MAX_PORTS);
  642         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK,
  643                 UID_UUCP, GID_DIALER, 0660, "cuac%r%r", adapter,
  644                 unit % CY_MAX_PORTS);
  645         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_INIT_STATE,
  646                 UID_UUCP, GID_DIALER, 0660, "cuaic%r%r", adapter,
  647                 unit % CY_MAX_PORTS);
  648         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE,
  649                 UID_UUCP, GID_DIALER, 0660, "cualc%r%r", adapter,
  650                 unit % CY_MAX_PORTS);
  651                 }
  652         }
  653 
  654         /* ensure an edge for the next interrupt */
  655         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
  656 
  657         return (adapter);
  658 }
  659 
  660 static int
  661 sioopen(dev, flag, mode, td)
  662         dev_t           dev;
  663         int             flag;
  664         int             mode;
  665         struct thread   *td;
  666 {
  667         struct com_s    *com;
  668         int             error;
  669         int             mynor;
  670         int             s;
  671         struct tty      *tp;
  672         int             unit;
  673 
  674         mynor = minor(dev);
  675         unit = MINOR_TO_UNIT(mynor);
  676         if ((u_int) unit >= NSIO || (com = com_addr(unit)) == NULL)
  677                 return (ENXIO);
  678         if (mynor & CONTROL_MASK)
  679                 return (0);
  680         tp = dev->si_tty = com->tp = ttymalloc(com->tp);
  681         s = spltty();
  682         /*
  683          * We jump to this label after all non-interrupted sleeps to pick
  684          * up any changes of the device state.
  685          */
  686 open_top:
  687         while (com->state & CS_DTR_OFF) {
  688                 error = tsleep(&com->dtr_wait, TTIPRI | PCATCH, "cydtr", 0);
  689                 if (error != 0)
  690                         goto out;
  691         }
  692         if (tp->t_state & TS_ISOPEN) {
  693                 /*
  694                  * The device is open, so everything has been initialized.
  695                  * Handle conflicts.
  696                  */
  697                 if (mynor & CALLOUT_MASK) {
  698                         if (!com->active_out) {
  699                                 error = EBUSY;
  700                                 goto out;
  701                         }
  702                 } else {
  703                         if (com->active_out) {
  704                                 if (flag & O_NONBLOCK) {
  705                                         error = EBUSY;
  706                                         goto out;
  707                                 }
  708                                 error = tsleep(&com->active_out,
  709                                                TTIPRI | PCATCH, "cybi", 0);
  710                                 if (error != 0)
  711                                         goto out;
  712                                 goto open_top;
  713                         }
  714                 }
  715                 if (tp->t_state & TS_XCLUDE &&
  716                     suser(td)) {
  717                         error = EBUSY;
  718                         goto out;
  719                 }
  720         } else {
  721                 /*
  722                  * The device isn't open, so there are no conflicts.
  723                  * Initialize it.  Initialization is done twice in many
  724                  * cases: to preempt sleeping callin opens if we are
  725                  * callout, and to complete a callin open after DCD rises.
  726                  */
  727                 tp->t_oproc = comstart;
  728                 tp->t_stop = comstop;
  729                 tp->t_param = comparam;
  730                 tp->t_dev = dev;
  731                 tp->t_termios = mynor & CALLOUT_MASK
  732                                 ? com->it_out : com->it_in;
  733 
  734                 /* Encode per-board unit in LIVR for access in intr routines. */
  735                 cd_setreg(com, CD1400_LIVR,
  736                           (unit & CD1400_xIVR_CHAN) << CD1400_xIVR_CHAN_SHIFT);
  737 
  738                 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET);
  739 #if 0
  740                 com->poll = com->no_irq;
  741                 com->poll_output = com->loses_outints;
  742 #endif
  743                 ++com->wopeners;
  744                 error = comparam(tp, &tp->t_termios);
  745                 --com->wopeners;
  746                 if (error != 0)
  747                         goto out;
  748 #if 0
  749                 if (com->hasfifo) {
  750                         /*
  751                          * (Re)enable and flush fifos.
  752                          *
  753                          * Certain SMC chips cause problems if the fifos
  754                          * are enabled while input is ready.  Turn off the
  755                          * fifo if necessary to clear the input.  We test
  756                          * the input ready bit after enabling the fifos
  757                          * since we've already enabled them in comparam()
  758                          * and to handle races between enabling and fresh
  759                          * input.
  760                          */
  761                         while (TRUE) {
  762                                 outb(iobase + com_fifo,
  763                                      FIFO_RCV_RST | FIFO_XMT_RST
  764                                      | com->fifo_image);
  765                                 DELAY(100);
  766                                 if (!(inb(com->line_status_port) & LSR_RXRDY))
  767                                         break;
  768                                 outb(iobase + com_fifo, 0);
  769                                 DELAY(100);
  770                                 (void) inb(com->data_port);
  771                         }
  772                 }
  773 
  774                 critical_enter();
  775                 COM_LOCK();
  776                 (void) inb(com->line_status_port);
  777                 (void) inb(com->data_port);
  778                 com->prev_modem_status = com->last_modem_status
  779                     = inb(com->modem_status_port);
  780                 outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS
  781                                        | IER_EMSC);
  782                 COM_UNLOCK();
  783                 critical_exit();
  784 #else /* !0 */
  785                 /*
  786                  * Flush fifos.  This requires a full channel reset which
  787                  * also disables the transmitter and receiver.  Recover
  788                  * from this.
  789                  */
  790                 cd1400_channel_cmd(com,
  791                                    CD1400_CCR_CMDRESET | CD1400_CCR_CHANRESET);
  792                 cd1400_channel_cmd(com, com->channel_control);
  793 
  794                 critical_enter();
  795                 COM_LOCK();
  796                 com->prev_modem_status = com->last_modem_status
  797                     = cd_getreg(com, CD1400_MSVR2);
  798                 cd_setreg(com, CD1400_SRER,
  799                           com->intr_enable
  800                           = CD1400_SRER_MDMCH | CD1400_SRER_RXDATA);
  801                 COM_UNLOCK();
  802                 critical_exit();
  803 #endif /* 0 */
  804                 /*
  805                  * Handle initial DCD.  Callout devices get a fake initial
  806                  * DCD (trapdoor DCD).  If we are callout, then any sleeping
  807                  * callin opens get woken up and resume sleeping on "cybi"
  808                  * instead of "cydcd".
  809                  */
  810                 /*
  811                  * XXX `mynor & CALLOUT_MASK' should be
  812                  * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
  813                  * TRAPDOOR_CARRIER is the default initial state for callout
  814                  * devices and SOFT_CARRIER is like CLOCAL except it hides
  815                  * the true carrier.
  816                  */
  817                 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK)
  818                         (*linesw[tp->t_line].l_modem)(tp, 1);
  819         }
  820         /*
  821          * Wait for DCD if necessary.
  822          */
  823         if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK)
  824             && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) {
  825                 ++com->wopeners;
  826                 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "cydcd", 0);
  827                 --com->wopeners;
  828                 if (error != 0)
  829                         goto out;
  830                 goto open_top;
  831         }
  832         error = (*linesw[tp->t_line].l_open)(dev, tp);
  833         disc_optim(tp, &tp->t_termios, com);
  834         if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
  835                 com->active_out = TRUE;
  836         siosettimeout();
  837 out:
  838         splx(s);
  839         if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
  840                 comhardclose(com);
  841         return (error);
  842 }
  843 
  844 static int
  845 sioclose(dev, flag, mode, td)
  846         dev_t           dev;
  847         int             flag;
  848         int             mode;
  849         struct thread   *td;
  850 {
  851         struct com_s    *com;
  852         int             mynor;
  853         int             s;
  854         struct tty      *tp;
  855 
  856         mynor = minor(dev);
  857         if (mynor & CONTROL_MASK)
  858                 return (0);
  859         com = com_addr(MINOR_TO_UNIT(mynor));
  860         tp = com->tp;
  861         s = spltty();
  862         cd_etc(com, CD1400_ETC_STOPBREAK);
  863         (*linesw[tp->t_line].l_close)(tp, flag);
  864         disc_optim(tp, &tp->t_termios, com);
  865         comstop(tp, FREAD | FWRITE);
  866         comhardclose(com);
  867         ttyclose(tp);
  868         siosettimeout();
  869         splx(s);
  870 #ifdef broken /* session holds a ref to the tty; can't deallocate */
  871         ttyfree(tp);
  872         com->tp = NULL;
  873 #endif
  874         return (0);
  875 }
  876 
  877 static void
  878 comhardclose(com)
  879         struct com_s    *com;
  880 {
  881         cy_addr         iobase;
  882         int             s;
  883         struct tty      *tp;
  884         int             unit;
  885 
  886         unit = com->unit;
  887         iobase = com->iobase;
  888         s = spltty();
  889 #if 0
  890         com->poll = FALSE;
  891         com->poll_output = FALSE;
  892 #endif
  893         com->do_timestamp = 0;
  894 #if 0
  895         outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
  896 #else
  897         /* XXX */
  898         critical_enter();
  899         COM_LOCK();
  900         com->etc = ETC_NONE;
  901         cd_setreg(com, CD1400_COR2, com->cor[1] &= ~CD1400_COR2_ETC);
  902         COM_UNLOCK();
  903         critical_exit();
  904         cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
  905 #endif
  906 
  907         {
  908 #if 0
  909                 outb(iobase + com_ier, 0);
  910 #else
  911                 critical_enter();
  912                 COM_LOCK();
  913                 cd_setreg(com, CD1400_SRER, com->intr_enable = 0);
  914                 COM_UNLOCK();
  915                 critical_exit();
  916 #endif
  917                 tp = com->tp;
  918                 if ((tp->t_cflag & HUPCL)
  919                     /*
  920                      * XXX we will miss any carrier drop between here and the
  921                      * next open.  Perhaps we should watch DCD even when the
  922                      * port is closed; it is not sufficient to check it at
  923                      * the next open because it might go up and down while
  924                      * we're not watching.
  925                      */
  926                     || (!com->active_out
  927                        && !(com->prev_modem_status & MSR_DCD)
  928                        && !(com->it_in.c_cflag & CLOCAL))
  929                     || !(tp->t_state & TS_ISOPEN)) {
  930                         (void)commctl(com, TIOCM_DTR, DMBIC);
  931 
  932                         /* Disable receiver (leave transmitter enabled). */
  933                         com->channel_control = CD1400_CCR_CMDCHANCTL
  934                                                | CD1400_CCR_XMTEN
  935                                                | CD1400_CCR_RCVDIS;
  936                         cd1400_channel_cmd(com, com->channel_control);
  937 
  938                         if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) {
  939                                 timeout(siodtrwakeup, com, com->dtr_wait);
  940                                 com->state |= CS_DTR_OFF;
  941                         }
  942                 }
  943         }
  944 #if 0
  945         if (com->hasfifo) {
  946                 /*
  947                  * Disable fifos so that they are off after controlled
  948                  * reboots.  Some BIOSes fail to detect 16550s when the
  949                  * fifos are enabled.
  950                  */
  951                 outb(iobase + com_fifo, 0);
  952         }
  953 #endif
  954         com->active_out = FALSE;
  955         wakeup(&com->active_out);
  956         wakeup(TSA_CARR_ON(tp));        /* restart any wopeners */
  957         splx(s);
  958 }
  959 
  960 static int
  961 siowrite(dev, uio, flag)
  962         dev_t           dev;
  963         struct uio      *uio;
  964         int             flag;
  965 {
  966         int             mynor;
  967         struct tty      *tp;
  968         int             unit;
  969 
  970         mynor = minor(dev);
  971         if (mynor & CONTROL_MASK)
  972                 return (ENODEV);
  973 
  974         unit = MINOR_TO_UNIT(mynor);
  975         tp = com_addr(unit)->tp;
  976         /*
  977          * (XXX) We disallow virtual consoles if the physical console is
  978          * a serial port.  This is in case there is a display attached that
  979          * is not the console.  In that situation we don't need/want the X
  980          * server taking over the console.
  981          */
  982         if (constty != NULL && unit == comconsole)
  983                 constty = NULL;
  984 #ifdef Smarts
  985         /* XXX duplicate ttwrite(), but without so much output processing on
  986          * CR & LF chars.  Hardly worth the effort, given that high-throughput
  987          * sessions are raw anyhow.
  988          */
  989 #else
  990         return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
  991 #endif
  992 }
  993 
  994 static void
  995 siodtrwakeup(chan)
  996         void    *chan;
  997 {
  998         struct com_s    *com;
  999 
 1000         com = (struct com_s *)chan;
 1001         com->state &= ~CS_DTR_OFF;
 1002         wakeup(&com->dtr_wait);
 1003 }
 1004 
 1005 /*
 1006  * This function:
 1007  *  a) needs to be called with COM_LOCK() held, and
 1008  *  b) needs to return with COM_LOCK() held.
 1009  */
 1010 static void
 1011 sioinput(com)
 1012         struct com_s    *com;
 1013 {
 1014         u_char          *buf;
 1015         int             incc;
 1016         u_char          line_status;
 1017         int             recv_data;
 1018         struct tty      *tp;
 1019 
 1020         buf = com->ibuf;
 1021         tp = com->tp;
 1022         if (!(tp->t_state & TS_ISOPEN)) {
 1023                 com_events -= (com->iptr - com->ibuf);
 1024                 com->iptr = com->ibuf;
 1025                 return;
 1026         }
 1027         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
 1028                 /*
 1029                  * Avoid the grotesquely inefficient lineswitch routine
 1030                  * (ttyinput) in "raw" mode.  It usually takes about 450
 1031                  * instructions (that's without canonical processing or echo!).
 1032                  * slinput is reasonably fast (usually 40 instructions plus
 1033                  * call overhead).
 1034                  */
 1035 
 1036                 do {
 1037                         /*
 1038                          * This may look odd, but it is using save-and-enable
 1039                          * semantics instead of the save-and-disable semantics
 1040                          * that are used everywhere else.
 1041                          */
 1042                         COM_UNLOCK();
 1043                         critical_exit();
 1044                         incc = com->iptr - buf;
 1045                         if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
 1046                             && (com->state & CS_RTS_IFLOW
 1047                                 || tp->t_iflag & IXOFF)
 1048                             && !(tp->t_state & TS_TBLOCK))
 1049                                 ttyblock(tp);
 1050                         com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
 1051                                 += b_to_q((char *)buf, incc, &tp->t_rawq);
 1052                         buf += incc;
 1053                         tk_nin += incc;
 1054                         tk_rawcc += incc;
 1055                         tp->t_rawcc += incc;
 1056                         ttwakeup(tp);
 1057                         if (tp->t_state & TS_TTSTOP
 1058                             && (tp->t_iflag & IXANY
 1059                                 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
 1060                                 tp->t_state &= ~TS_TTSTOP;
 1061                                 tp->t_lflag &= ~FLUSHO;
 1062                                 comstart(tp);
 1063                         }
 1064                         critical_enter();
 1065                         COM_LOCK();
 1066                 } while (buf < com->iptr);
 1067         } else {
 1068                 do {
 1069                         /*
 1070                          * This may look odd, but it is using save-and-enable
 1071                          * semantics instead of the save-and-disable semantics
 1072                          * that are used everywhere else.
 1073                          */
 1074                         COM_UNLOCK();
 1075                         critical_exit();
 1076                         line_status = buf[com->ierroff];
 1077                         recv_data = *buf++;
 1078                         if (line_status
 1079                             & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
 1080                                 if (line_status & LSR_BI)
 1081                                         recv_data |= TTY_BI;
 1082                                 if (line_status & LSR_FE)
 1083                                         recv_data |= TTY_FE;
 1084                                 if (line_status & LSR_OE)
 1085                                         recv_data |= TTY_OE;
 1086                                 if (line_status & LSR_PE)
 1087                                         recv_data |= TTY_PE;
 1088                         }
 1089                         (*linesw[tp->t_line].l_rint)(recv_data, tp);
 1090                         critical_enter();
 1091                         COM_LOCK();
 1092                 } while (buf < com->iptr);
 1093         }
 1094         com_events -= (com->iptr - com->ibuf);
 1095         com->iptr = com->ibuf;
 1096 
 1097         /*
 1098          * There is now room for another low-level buffer full of input,
 1099          * so enable RTS if it is now disabled and there is room in the
 1100          * high-level buffer.
 1101          */
 1102         if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & com->mcr_rts) &&
 1103             !(tp->t_state & TS_TBLOCK))
 1104 #if 0
 1105                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
 1106 #else
 1107                 cd_setreg(com, com->mcr_rts_reg,
 1108                           com->mcr_image |= com->mcr_rts);
 1109 #endif
 1110 }
 1111 
 1112 void
 1113 siointr(unit)
 1114         int     unit;
 1115 {
 1116         int     baseu;
 1117         int     cy_align;
 1118         cy_addr cy_iobase;
 1119         int     cyu;
 1120         cy_addr iobase;
 1121         u_char  status;
 1122 
 1123         COM_LOCK();     /* XXX could this be placed down lower in the loop? */
 1124 
 1125         baseu = unit * CY_MAX_PORTS;
 1126         cy_align = com_addr(baseu)->cy_align;
 1127         cy_iobase = com_addr(baseu)->cy_iobase;
 1128 
 1129         /* check each CD1400 in turn */
 1130         for (cyu = 0; cyu < cy_nr_cd1400s[unit]; ++cyu) {
 1131                 iobase = (cy_addr) (cy_iobase
 1132                                     + (cy_chip_offset[cyu] << cy_align));
 1133                 /* poll to see if it has any work */
 1134                 status = cd_inb(iobase, CD1400_SVRR, cy_align);
 1135                 if (status == 0)
 1136                         continue;
 1137 #ifdef CyDebug
 1138                 ++cy_svrr_probes;
 1139 #endif
 1140                 /* service requests as appropriate, giving priority to RX */
 1141                 if (status & CD1400_SVRR_RXRDY) {
 1142                         struct com_s    *com;
 1143                         u_int           count;
 1144                         u_char          *ioptr;
 1145                         u_char          line_status;
 1146                         u_char          recv_data;
 1147                         u_char          serv_type;
 1148 #ifdef PollMode
 1149                         u_char          save_rir;
 1150 #endif
 1151 
 1152 #ifdef PollMode
 1153                         save_rir = cd_inb(iobase, CD1400_RIR, cy_align);
 1154 
 1155                         /* enter rx service */
 1156                         cd_outb(iobase, CD1400_CAR, cy_align, save_rir);
 1157                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
 1158                         = save_rir & CD1400_CAR_CHAN;
 1159 
 1160                         serv_type = cd_inb(iobase, CD1400_RIVR, cy_align);
 1161                         com = com_addr(baseu
 1162                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
 1163                                           & CD1400_xIVR_CHAN));
 1164 #else
 1165                         /* ack receive service */
 1166                         serv_type = cy_inb(iobase, CY8_SVCACKR, cy_align);
 1167 
 1168                         com = com_addr(baseu +
 1169                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
 1170                                           & CD1400_xIVR_CHAN));
 1171 #endif
 1172 
 1173                 if (serv_type & CD1400_RIVR_EXCEPTION) {
 1174                         ++com->recv_exception;
 1175                         line_status = cd_inb(iobase, CD1400_RDSR, cy_align);
 1176                         /* break/unnattached error bits or real input? */
 1177                         recv_data = cd_inb(iobase, CD1400_RDSR, cy_align);
 1178 #ifndef SOFT_HOTCHAR
 1179                         if (line_status & CD1400_RDSR_SPECIAL
 1180                             && com->hotchar != 0)
 1181                                 swi_sched(sio_ih, 0);
 1182 
 1183 #endif
 1184 #if 1 /* XXX "intelligent" PFO error handling would break O error handling */
 1185                         if (line_status & (LSR_PE|LSR_FE|LSR_BI)) {
 1186                                 /*
 1187                                   Don't store PE if IGNPAR and BI if IGNBRK,
 1188                                   this hack allows "raw" tty optimization
 1189                                   works even if IGN* is set.
 1190                                 */
 1191                                 if (   com->tp == NULL
 1192                                     || !(com->tp->t_state & TS_ISOPEN)
 1193                                     || ((line_status & (LSR_PE|LSR_FE))
 1194                                     &&  (com->tp->t_iflag & IGNPAR))
 1195                                     || ((line_status & LSR_BI)
 1196                                     &&  (com->tp->t_iflag & IGNBRK)))
 1197                                         goto cont;
 1198                                 if (   (line_status & (LSR_PE|LSR_FE))
 1199                                     && (com->tp->t_state & TS_CAN_BYPASS_L_RINT)
 1200                                     && ((line_status & LSR_FE)
 1201                                     ||  ((line_status & LSR_PE)
 1202                                     &&  (com->tp->t_iflag & INPCK))))
 1203                                         recv_data = 0;
 1204                         }
 1205 #endif /* 1 */
 1206                         ++com->bytes_in;
 1207 #ifdef SOFT_HOTCHAR
 1208                         if (com->hotchar != 0 && recv_data == com->hotchar)
 1209                                 swi_sched(sio_ih, 0);
 1210 #endif
 1211                         ioptr = com->iptr;
 1212                         if (ioptr >= com->ibufend)
 1213                                 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
 1214                         else {
 1215                                 if (com->do_timestamp)
 1216                                         microtime(&com->timestamp);
 1217                                 ++com_events;
 1218                                 ioptr[0] = recv_data;
 1219                                 ioptr[com->ierroff] = line_status;
 1220                                 com->iptr = ++ioptr;
 1221                                 if (ioptr == com->ihighwater
 1222                                     && com->state & CS_RTS_IFLOW)
 1223 #if 0
 1224                                         outb(com->modem_ctl_port,
 1225                                              com->mcr_image &= ~MCR_RTS);
 1226 #else
 1227                                         cd_outb(iobase, com->mcr_rts_reg,
 1228                                                 cy_align,
 1229                                                 com->mcr_image &=
 1230                                                 ~com->mcr_rts);
 1231 #endif
 1232                                 if (line_status & LSR_OE)
 1233                                         CE_RECORD(com, CE_OVERRUN);
 1234                         }
 1235                         goto cont;
 1236                 } else {
 1237                         int     ifree;
 1238 
 1239                         count = cd_inb(iobase, CD1400_RDCR, cy_align);
 1240                         if (!count)
 1241                                 goto cont;
 1242                         com->bytes_in += count;
 1243                         ioptr = com->iptr;
 1244                         ifree = com->ibufend - ioptr;
 1245                         if (count > ifree) {
 1246                                 count -= ifree;
 1247                                 com_events += ifree;
 1248                                 if (ifree != 0) {
 1249                                         if (com->do_timestamp)
 1250                                                 microtime(&com->timestamp);
 1251                                         do {
 1252                                                 recv_data = cd_inb(iobase,
 1253                                                                    CD1400_RDSR,
 1254                                                                    cy_align);
 1255 #ifdef SOFT_HOTCHAR
 1256                                                 if (com->hotchar != 0
 1257                                                     && recv_data
 1258                                                        == com->hotchar)
 1259                                                         swi_sched(sio_ih, 0);
 1260 #endif
 1261                                                 ioptr[0] = recv_data;
 1262                                                 ioptr[com->ierroff] = 0;
 1263                                                 ++ioptr;
 1264                                         } while (--ifree != 0);
 1265                                 }
 1266                                 com->delta_error_counts
 1267                                     [CE_INTERRUPT_BUF_OVERFLOW] += count;
 1268                                 do {
 1269                                         recv_data = cd_inb(iobase, CD1400_RDSR,
 1270                                                            cy_align);
 1271 #ifdef SOFT_HOTCHAR
 1272                                         if (com->hotchar != 0
 1273                                             && recv_data == com->hotchar)
 1274                                                 swi_sched(sio_ih, 0);
 1275 #endif
 1276                                 } while (--count != 0);
 1277                         } else {
 1278                                 if (com->do_timestamp)
 1279                                         microtime(&com->timestamp);
 1280                                 if (ioptr <= com->ihighwater
 1281                                     && ioptr + count > com->ihighwater
 1282                                     && com->state & CS_RTS_IFLOW)
 1283 #if 0
 1284                                         outb(com->modem_ctl_port,
 1285                                              com->mcr_image &= ~MCR_RTS);
 1286 #else
 1287                                         cd_outb(iobase, com->mcr_rts_reg,
 1288                                                 cy_align,
 1289                                                 com->mcr_image
 1290                                                 &= ~com->mcr_rts);
 1291 #endif
 1292                                 com_events += count;
 1293                                 do {
 1294                                         recv_data = cd_inb(iobase, CD1400_RDSR,
 1295                                                            cy_align);
 1296 #ifdef SOFT_HOTCHAR
 1297                                         if (com->hotchar != 0
 1298                                             && recv_data == com->hotchar)
 1299                                                 swi_sched(sio_ih, 0);
 1300 #endif
 1301                                         ioptr[0] = recv_data;
 1302                                         ioptr[com->ierroff] = 0;
 1303                                         ++ioptr;
 1304                                 } while (--count != 0);
 1305                         }
 1306                         com->iptr = ioptr;
 1307                 }
 1308 cont:
 1309 
 1310                         /* terminate service context */
 1311 #ifdef PollMode
 1312                         cd_outb(iobase, CD1400_RIR, cy_align,
 1313                                 save_rir
 1314                                 & ~(CD1400_RIR_RDIREQ | CD1400_RIR_RBUSY));
 1315 #else
 1316                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
 1317 #endif
 1318                 }
 1319                 if (status & CD1400_SVRR_MDMCH) {
 1320                         struct com_s    *com;
 1321                         u_char  modem_status;
 1322 #ifdef PollMode
 1323                         u_char  save_mir;
 1324 #else
 1325                         u_char  vector;
 1326 #endif
 1327 
 1328 #ifdef PollMode
 1329                         save_mir = cd_inb(iobase, CD1400_MIR, cy_align);
 1330 
 1331                         /* enter modem service */
 1332                         cd_outb(iobase, CD1400_CAR, cy_align, save_mir);
 1333                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
 1334                         = save_mir & CD1400_CAR_CHAN;
 1335 
 1336                         com = com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS
 1337                                        + (save_mir & CD1400_MIR_CHAN));
 1338 #else
 1339                         /* ack modem service */
 1340                         vector = cy_inb(iobase, CY8_SVCACKM, cy_align);
 1341 
 1342                         com = com_addr(baseu
 1343                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
 1344                                           & CD1400_xIVR_CHAN));
 1345 #endif
 1346                         ++com->mdm;
 1347                         modem_status = cd_inb(iobase, CD1400_MSVR2, cy_align);
 1348                 if (modem_status != com->last_modem_status) {
 1349                         if (com->do_dcd_timestamp
 1350                             && !(com->last_modem_status & MSR_DCD)
 1351                             && modem_status & MSR_DCD)
 1352                                 microtime(&com->dcd_timestamp);
 1353 
 1354                         /*
 1355                          * Schedule high level to handle DCD changes.  Note
 1356                          * that we don't use the delta bits anywhere.  Some
 1357                          * UARTs mess them up, and it's easy to remember the
 1358                          * previous bits and calculate the delta.
 1359                          */
 1360                         com->last_modem_status = modem_status;
 1361                         if (!(com->state & CS_CHECKMSR)) {
 1362                                 com_events += LOTS_OF_EVENTS;
 1363                                 com->state |= CS_CHECKMSR;
 1364                                 swi_sched(sio_ih, 0);
 1365                         }
 1366 
 1367 #ifdef SOFT_CTS_OFLOW
 1368                         /* handle CTS change immediately for crisp flow ctl */
 1369                         if (com->state & CS_CTS_OFLOW) {
 1370                                 if (modem_status & MSR_CTS) {
 1371                                         com->state |= CS_ODEVREADY;
 1372                                         if (com->state >= (CS_BUSY | CS_TTGO
 1373                                                            | CS_ODEVREADY)
 1374                                             && !(com->intr_enable
 1375                                                  & CD1400_SRER_TXRDY))
 1376                                                 cd_outb(iobase, CD1400_SRER,
 1377                                                         cy_align,
 1378                                                         com->intr_enable
 1379                                                         = com->intr_enable
 1380                                                           & ~CD1400_SRER_TXMPTY
 1381                                                           | CD1400_SRER_TXRDY);
 1382                                 } else {
 1383                                         com->state &= ~CS_ODEVREADY;
 1384                                         if (com->intr_enable
 1385                                             & CD1400_SRER_TXRDY)
 1386                                                 cd_outb(iobase, CD1400_SRER,
 1387                                                         cy_align,
 1388                                                         com->intr_enable
 1389                                                         = com->intr_enable
 1390                                                           & ~CD1400_SRER_TXRDY
 1391                                                           | CD1400_SRER_TXMPTY);
 1392                                 }
 1393                         }
 1394 #endif
 1395                 }
 1396 
 1397                         /* terminate service context */
 1398 #ifdef PollMode
 1399                         cd_outb(iobase, CD1400_MIR, cy_align,
 1400                                 save_mir
 1401                                 & ~(CD1400_MIR_RDIREQ | CD1400_MIR_RBUSY));
 1402 #else
 1403                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
 1404 #endif
 1405                 }
 1406                 if (status & CD1400_SVRR_TXRDY) {
 1407                         struct com_s    *com;
 1408 #ifdef PollMode
 1409                         u_char  save_tir;
 1410 #else
 1411                         u_char  vector;
 1412 #endif
 1413 
 1414 #ifdef PollMode
 1415                         save_tir = cd_inb(iobase, CD1400_TIR, cy_align);
 1416 
 1417                         /* enter tx service */
 1418                         cd_outb(iobase, CD1400_CAR, cy_align, save_tir);
 1419                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
 1420                         = save_tir & CD1400_CAR_CHAN;
 1421 
 1422                         com = com_addr(baseu
 1423                                        + cyu * CD1400_NO_OF_CHANNELS
 1424                                        + (save_tir & CD1400_TIR_CHAN));
 1425 #else
 1426                         /* ack transmit service */
 1427                         vector = cy_inb(iobase, CY8_SVCACKT, cy_align);
 1428 
 1429                         com = com_addr(baseu
 1430                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
 1431                                           & CD1400_xIVR_CHAN));
 1432 #endif
 1433 
 1434                         if (com->etc != ETC_NONE) {
 1435                                 if (com->intr_enable & CD1400_SRER_TXRDY) {
 1436                                         /*
 1437                                          * Here due to sloppy SRER_TXRDY
 1438                                          * enabling.  Ignore.  Come back when
 1439                                          * tx is empty.
 1440                                          */
 1441                                         cd_outb(iobase, CD1400_SRER, cy_align,
 1442                                                 com->intr_enable
 1443                                                 = (com->intr_enable
 1444                                                   & ~CD1400_SRER_TXRDY)
 1445                                                   | CD1400_SRER_TXMPTY);
 1446                                         goto terminate_tx_service;
 1447                                 }
 1448                                 switch (com->etc) {
 1449                                 case CD1400_ETC_SENDBREAK:
 1450                                 case CD1400_ETC_STOPBREAK:
 1451                                         /*
 1452                                          * Start the command.  Come back on
 1453                                          * next tx empty interrupt, hopefully
 1454                                          * after command has been executed.
 1455                                          */
 1456                                         cd_outb(iobase, CD1400_COR2, cy_align,
 1457                                                 com->cor[1] |= CD1400_COR2_ETC);
 1458                                         cd_outb(iobase, CD1400_TDR, cy_align,
 1459                                                 CD1400_ETC_CMD);
 1460                                         cd_outb(iobase, CD1400_TDR, cy_align,
 1461                                                 com->etc);
 1462                                         if (com->etc == CD1400_ETC_SENDBREAK)
 1463                                                 com->etc = ETC_BREAK_STARTING;
 1464                                         else
 1465                                                 com->etc = ETC_BREAK_ENDING;
 1466                                         goto terminate_tx_service;
 1467                                 case ETC_BREAK_STARTING:
 1468                                         /*
 1469                                          * BREAK is now on.  Continue with
 1470                                          * SRER_TXMPTY processing, hopefully
 1471                                          * don't come back.
 1472                                          */
 1473                                         com->etc = ETC_BREAK_STARTED;
 1474                                         break;
 1475                                 case ETC_BREAK_STARTED:
 1476                                         /*
 1477                                          * Came back due to sloppy SRER_TXMPTY
 1478                                          * enabling.  Hope again.
 1479                                          */
 1480                                         break;
 1481                                 case ETC_BREAK_ENDING:
 1482                                         /*
 1483                                          * BREAK is now off.  Continue with
 1484                                          * SRER_TXMPTY processing and don't
 1485                                          * come back.  The SWI handler will
 1486                                          * restart tx interrupts if necessary.
 1487                                          */
 1488                                         cd_outb(iobase, CD1400_COR2, cy_align,
 1489                                                 com->cor[1]
 1490                                                 &= ~CD1400_COR2_ETC);
 1491                                         com->etc = ETC_BREAK_ENDED;
 1492                                         if (!(com->state & CS_ODONE)) {
 1493                                                 com_events += LOTS_OF_EVENTS;
 1494                                                 com->state |= CS_ODONE;
 1495                                                 swi_sched(sio_ih, 0);
 1496                                         }
 1497                                         break;
 1498                                 case ETC_BREAK_ENDED:
 1499                                         /*
 1500                                          * Shouldn't get here.  Hope again.
 1501                                          */
 1502                                         break;
 1503                                 }
 1504                         }
 1505                         if (com->intr_enable & CD1400_SRER_TXMPTY) {
 1506                                 if (!(com->extra_state & CSE_ODONE)) {
 1507                                         com_events += LOTS_OF_EVENTS;
 1508                                         com->extra_state |= CSE_ODONE;
 1509                                         swi_sched(sio_ih, 0);
 1510                                 }
 1511                                 cd_outb(iobase, CD1400_SRER, cy_align,
 1512                                         com->intr_enable
 1513                                         &= ~CD1400_SRER_TXMPTY);
 1514                                 goto terminate_tx_service;
 1515                         }
 1516                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
 1517                         u_char  *ioptr;
 1518                         u_int   ocount;
 1519 
 1520                         ioptr = com->obufq.l_head;
 1521                                 ocount = com->obufq.l_tail - ioptr;
 1522                                 if (ocount > CD1400_TX_FIFO_SIZE)
 1523                                         ocount = CD1400_TX_FIFO_SIZE;
 1524                                 com->bytes_out += ocount;
 1525                                 do
 1526                                         cd_outb(iobase, CD1400_TDR, cy_align,
 1527                                                 *ioptr++);
 1528                                 while (--ocount != 0);
 1529                         com->obufq.l_head = ioptr;
 1530                         if (ioptr >= com->obufq.l_tail) {
 1531                                 struct lbq      *qp;
 1532 
 1533                                 qp = com->obufq.l_next;
 1534                                 qp->l_queued = FALSE;
 1535                                 qp = qp->l_next;
 1536                                 if (qp != NULL) {
 1537                                         com->obufq.l_head = qp->l_head;
 1538                                         com->obufq.l_tail = qp->l_tail;
 1539                                         com->obufq.l_next = qp;
 1540                                 } else {
 1541                                         /* output just completed */
 1542                                         com->state &= ~CS_BUSY;
 1543 
 1544                                         /*
 1545                                          * The setting of CSE_ODONE may be
 1546                                          * stale here.  We currently only
 1547                                          * use it when CS_BUSY is set, and
 1548                                          * fixing it when we clear CS_BUSY
 1549                                          * is easiest.
 1550                                          */
 1551                                         if (com->extra_state & CSE_ODONE) {
 1552                                                 com_events -= LOTS_OF_EVENTS;
 1553                                                 com->extra_state &= ~CSE_ODONE;
 1554                                         }
 1555 
 1556                                         cd_outb(iobase, CD1400_SRER, cy_align,
 1557                                                 com->intr_enable
 1558                                                 = (com->intr_enable
 1559                                                   & ~CD1400_SRER_TXRDY)
 1560                                                   | CD1400_SRER_TXMPTY);
 1561                                 }
 1562                                 if (!(com->state & CS_ODONE)) {
 1563                                         com_events += LOTS_OF_EVENTS;
 1564                                         com->state |= CS_ODONE;
 1565 
 1566                                         /* handle at high level ASAP */
 1567                                         swi_sched(sio_ih, 0);
 1568                                 }
 1569                         }
 1570                 }
 1571 
 1572                         /* terminate service context */
 1573 terminate_tx_service:
 1574 #ifdef PollMode
 1575                         cd_outb(iobase, CD1400_TIR, cy_align,
 1576                                 save_tir
 1577                                 & ~(CD1400_TIR_RDIREQ | CD1400_TIR_RBUSY));
 1578 #else
 1579                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
 1580 #endif
 1581                 }
 1582         }
 1583 
 1584         /* ensure an edge for the next interrupt */
 1585         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
 1586 
 1587         swi_sched(sio_ih, 0);
 1588 
 1589         COM_UNLOCK();
 1590 }
 1591 
 1592 #if 0
 1593 static void
 1594 siointr1(com)
 1595         struct com_s    *com;
 1596 {
 1597 }
 1598 #endif
 1599 
 1600 static int
 1601 sioioctl(dev, cmd, data, flag, td)
 1602         dev_t           dev;
 1603         u_long          cmd;
 1604         caddr_t         data;
 1605         int             flag;
 1606         struct thread   *td;
 1607 {
 1608         struct com_s    *com;
 1609         int             error;
 1610         int             mynor;
 1611         int             s;
 1612         struct tty      *tp;
 1613 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
 1614         int             oldcmd;
 1615         struct termios  term;
 1616 #endif
 1617 
 1618         mynor = minor(dev);
 1619         com = com_addr(MINOR_TO_UNIT(mynor));
 1620         if (mynor & CONTROL_MASK) {
 1621                 struct termios  *ct;
 1622 
 1623                 switch (mynor & CONTROL_MASK) {
 1624                 case CONTROL_INIT_STATE:
 1625                         ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in;
 1626                         break;
 1627                 case CONTROL_LOCK_STATE:
 1628                         ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in;
 1629                         break;
 1630                 default:
 1631                         return (ENODEV);        /* /dev/nodev */
 1632                 }
 1633                 switch (cmd) {
 1634                 case TIOCSETA:
 1635                         error = suser(td);
 1636                         if (error != 0)
 1637                                 return (error);
 1638                         *ct = *(struct termios *)data;
 1639                         return (0);
 1640                 case TIOCGETA:
 1641                         *(struct termios *)data = *ct;
 1642                         return (0);
 1643                 case TIOCGETD:
 1644                         *(int *)data = TTYDISC;
 1645                         return (0);
 1646                 case TIOCGWINSZ:
 1647                         bzero(data, sizeof(struct winsize));
 1648                         return (0);
 1649                 default:
 1650                         return (ENOTTY);
 1651                 }
 1652         }
 1653         tp = com->tp;
 1654 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
 1655         term = tp->t_termios;
 1656         oldcmd = cmd;
 1657         error = ttsetcompat(tp, &cmd, data, &term);
 1658         if (error != 0)
 1659                 return (error);
 1660         if (cmd != oldcmd)
 1661                 data = (caddr_t)&term;
 1662 #endif
 1663         if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
 1664                 int     cc;
 1665                 struct termios *dt = (struct termios *)data;
 1666                 struct termios *lt = mynor & CALLOUT_MASK
 1667                                      ? &com->lt_out : &com->lt_in;
 1668 
 1669                 dt->c_iflag = (tp->t_iflag & lt->c_iflag)
 1670                               | (dt->c_iflag & ~lt->c_iflag);
 1671                 dt->c_oflag = (tp->t_oflag & lt->c_oflag)
 1672                               | (dt->c_oflag & ~lt->c_oflag);
 1673                 dt->c_cflag = (tp->t_cflag & lt->c_cflag)
 1674                               | (dt->c_cflag & ~lt->c_cflag);
 1675                 dt->c_lflag = (tp->t_lflag & lt->c_lflag)
 1676                               | (dt->c_lflag & ~lt->c_lflag);
 1677                 for (cc = 0; cc < NCCS; ++cc)
 1678                         if (lt->c_cc[cc] != 0)
 1679                                 dt->c_cc[cc] = tp->t_cc[cc];
 1680                 if (lt->c_ispeed != 0)
 1681                         dt->c_ispeed = tp->t_ispeed;
 1682                 if (lt->c_ospeed != 0)
 1683                         dt->c_ospeed = tp->t_ospeed;
 1684         }
 1685         error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
 1686         if (error != ENOIOCTL)
 1687                 return (error);
 1688         s = spltty();
 1689         error = ttioctl(tp, cmd, data, flag);
 1690         disc_optim(tp, &tp->t_termios, com);
 1691         if (error != ENOIOCTL) {
 1692                 splx(s);
 1693                 return (error);
 1694         }
 1695         switch (cmd) {
 1696         case TIOCSBRK:
 1697 #if 0
 1698                 outb(iobase + com_cfcr, com->cfcr_image |= CFCR_SBREAK);
 1699 #else
 1700                 cd_etc(com, CD1400_ETC_SENDBREAK);
 1701 #endif
 1702                 break;
 1703         case TIOCCBRK:
 1704 #if 0
 1705                 outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
 1706 #else
 1707                 cd_etc(com, CD1400_ETC_STOPBREAK);
 1708 #endif
 1709                 break;
 1710         case TIOCSDTR:
 1711                 (void)commctl(com, TIOCM_DTR, DMBIS);
 1712                 break;
 1713         case TIOCCDTR:
 1714                 (void)commctl(com, TIOCM_DTR, DMBIC);
 1715                 break;
 1716         /*
 1717          * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set.  The
 1718          * changes get undone on the next call to comparam().
 1719          */
 1720         case TIOCMSET:
 1721                 (void)commctl(com, *(int *)data, DMSET);
 1722                 break;
 1723         case TIOCMBIS:
 1724                 (void)commctl(com, *(int *)data, DMBIS);
 1725                 break;
 1726         case TIOCMBIC:
 1727                 (void)commctl(com, *(int *)data, DMBIC);
 1728                 break;
 1729         case TIOCMGET:
 1730                 *(int *)data = commctl(com, 0, DMGET);
 1731                 break;
 1732         case TIOCMSDTRWAIT:
 1733                 /* must be root since the wait applies to following logins */
 1734                 error = suser(td);
 1735                 if (error != 0) {
 1736                         splx(s);
 1737                         return (error);
 1738                 }
 1739                 com->dtr_wait = *(int *)data * hz / 100;
 1740                 break;
 1741         case TIOCMGDTRWAIT:
 1742                 *(int *)data = com->dtr_wait * 100 / hz;
 1743                 break;
 1744         case TIOCTIMESTAMP:
 1745                 com->do_timestamp = TRUE;
 1746                 *(struct timeval *)data = com->timestamp;
 1747                 break;
 1748         case TIOCDCDTIMESTAMP:
 1749                 com->do_dcd_timestamp = TRUE;
 1750                 *(struct timeval *)data = com->dcd_timestamp;
 1751                 break;
 1752         default:
 1753                 splx(s);
 1754                 return (ENOTTY);
 1755         }
 1756         splx(s);
 1757         return (0);
 1758 }
 1759 
 1760 static void
 1761 siopoll(void *arg)
 1762 {
 1763         int             unit;
 1764 
 1765 #ifdef CyDebug
 1766         ++cy_timeouts;
 1767 #endif
 1768         if (com_events == 0)
 1769                 return;
 1770 repeat:
 1771         for (unit = 0; unit < NSIO; ++unit) {
 1772                 struct com_s    *com;
 1773                 int             incc;
 1774                 struct tty      *tp;
 1775 
 1776                 com = com_addr(unit);
 1777                 if (com == NULL)
 1778                         continue;
 1779                 tp = com->tp;
 1780                 if (tp == NULL) {
 1781                         /*
 1782                          * XXX forget any events related to closed devices
 1783                          * (actually never opened devices) so that we don't
 1784                          * loop.
 1785                          */
 1786                         critical_enter();
 1787                         COM_LOCK();
 1788                         incc = com->iptr - com->ibuf;
 1789                         com->iptr = com->ibuf;
 1790                         if (com->state & CS_CHECKMSR) {
 1791                                 incc += LOTS_OF_EVENTS;
 1792                                 com->state &= ~CS_CHECKMSR;
 1793                         }
 1794                         com_events -= incc;
 1795                         COM_UNLOCK();
 1796                         critical_exit();
 1797                         if (incc != 0)
 1798                                 log(LOG_DEBUG,
 1799                                     "sio%d: %d events for device with no tp\n",
 1800                                     unit, incc);
 1801                         continue;
 1802                 }
 1803                 if (com->iptr != com->ibuf) {
 1804                         critical_enter();
 1805                         COM_LOCK();
 1806                         sioinput(com);
 1807                         COM_UNLOCK();
 1808                         critical_exit();
 1809                 }
 1810                 if (com->state & CS_CHECKMSR) {
 1811                         u_char  delta_modem_status;
 1812 
 1813                         critical_enter();
 1814                         COM_LOCK();
 1815                         sioinput(com);
 1816                         delta_modem_status = com->last_modem_status
 1817                                              ^ com->prev_modem_status;
 1818                         com->prev_modem_status = com->last_modem_status;
 1819                         com_events -= LOTS_OF_EVENTS;
 1820                         com->state &= ~CS_CHECKMSR;
 1821                         COM_UNLOCK();
 1822                         critical_exit();
 1823                         if (delta_modem_status & MSR_DCD)
 1824                                 (*linesw[tp->t_line].l_modem)
 1825                                         (tp, com->prev_modem_status & MSR_DCD);
 1826                 }
 1827                 if (com->extra_state & CSE_ODONE) {
 1828                         critical_enter();
 1829                         COM_LOCK();
 1830                         com_events -= LOTS_OF_EVENTS;
 1831                         com->extra_state &= ~CSE_ODONE;
 1832                         COM_UNLOCK();
 1833                         critical_exit();
 1834                         if (!(com->state & CS_BUSY)) {
 1835                                 tp->t_state &= ~TS_BUSY;
 1836                                 ttwwakeup(com->tp);
 1837                         }
 1838                         if (com->etc != ETC_NONE) {
 1839                                 if (com->etc == ETC_BREAK_ENDED)
 1840                                         com->etc = ETC_NONE;
 1841                                 wakeup(&com->etc);
 1842                         }
 1843                 }
 1844                 if (com->state & CS_ODONE) {
 1845                         critical_enter();
 1846                         COM_LOCK();
 1847                         com_events -= LOTS_OF_EVENTS;
 1848                         com->state &= ~CS_ODONE;
 1849                         COM_UNLOCK();
 1850                         critical_exit();
 1851                         (*linesw[tp->t_line].l_start)(tp);
 1852                 }
 1853                 if (com_events == 0)
 1854                         break;
 1855         }
 1856         if (com_events >= LOTS_OF_EVENTS)
 1857                 goto repeat;
 1858 }
 1859 
 1860 static int
 1861 comparam(tp, t)
 1862         struct tty      *tp;
 1863         struct termios  *t;
 1864 {
 1865         int             bits;
 1866         int             cflag;
 1867         struct com_s    *com;
 1868         u_char          cor_change;
 1869         u_long          cy_clock;
 1870         int             idivisor;
 1871         int             iflag;
 1872         int             iprescaler;
 1873         int             itimeout;
 1874         int             odivisor;
 1875         int             oprescaler;
 1876         u_char          opt;
 1877         int             s;
 1878         int             unit;
 1879 
 1880         /* do historical conversions */
 1881         if (t->c_ispeed == 0)
 1882                 t->c_ispeed = t->c_ospeed;
 1883 
 1884         unit = DEV_TO_UNIT(tp->t_dev);
 1885         com = com_addr(unit);
 1886 
 1887         /* check requested parameters */
 1888         cy_clock = CY_CLOCK(com->gfrcr_image);
 1889         idivisor = comspeed(t->c_ispeed, cy_clock, &iprescaler);
 1890         if (idivisor < 0)
 1891                 return (EINVAL);
 1892         odivisor = comspeed(t->c_ospeed, cy_clock, &oprescaler);
 1893         if (odivisor < 0)
 1894                 return (EINVAL);
 1895 
 1896         /* parameters are OK, convert them to the com struct and the device */
 1897         s = spltty();
 1898         if (odivisor == 0)
 1899                 (void)commctl(com, TIOCM_DTR, DMBIC);   /* hang up line */
 1900         else
 1901                 (void)commctl(com, TIOCM_DTR, DMBIS);
 1902 
 1903         (void) siosetwater(com, t->c_ispeed);
 1904 
 1905         /* XXX we don't actually change the speed atomically. */
 1906 
 1907         if (idivisor != 0) {
 1908                 cd_setreg(com, CD1400_RBPR, idivisor);
 1909                 cd_setreg(com, CD1400_RCOR, iprescaler);
 1910         }
 1911         if (odivisor != 0) {
 1912                 cd_setreg(com, CD1400_TBPR, odivisor);
 1913                 cd_setreg(com, CD1400_TCOR, oprescaler);
 1914         }
 1915 
 1916         /*
 1917          * channel control
 1918          *      receiver enable
 1919          *      transmitter enable (always set)
 1920          */
 1921         cflag = t->c_cflag;
 1922         opt = CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTEN
 1923               | (cflag & CREAD ? CD1400_CCR_RCVEN : CD1400_CCR_RCVDIS);
 1924         if (opt != com->channel_control) {
 1925                 com->channel_control = opt;
 1926                 cd1400_channel_cmd(com, opt);
 1927         }
 1928 
 1929 #ifdef Smarts
 1930         /* set special chars */
 1931         /* XXX if one is _POSIX_VDISABLE, can't use some others */
 1932         if (t->c_cc[VSTOP] != _POSIX_VDISABLE)
 1933                 cd_setreg(com, CD1400_SCHR1, t->c_cc[VSTOP]);
 1934         if (t->c_cc[VSTART] != _POSIX_VDISABLE)
 1935                 cd_setreg(com, CD1400_SCHR2, t->c_cc[VSTART]);
 1936         if (t->c_cc[VINTR] != _POSIX_VDISABLE)
 1937                 cd_setreg(com, CD1400_SCHR3, t->c_cc[VINTR]);
 1938         if (t->c_cc[VSUSP] != _POSIX_VDISABLE)
 1939                 cd_setreg(com, CD1400_SCHR4, t->c_cc[VSUSP]);
 1940 #endif
 1941 
 1942         /*
 1943          * set channel option register 1 -
 1944          *      parity mode
 1945          *      stop bits
 1946          *      char length
 1947          */
 1948         opt = 0;
 1949         /* parity */
 1950         if (cflag & PARENB) {
 1951                 if (cflag & PARODD)
 1952                         opt |= CD1400_COR1_PARODD;
 1953                 opt |= CD1400_COR1_PARNORMAL;
 1954         }
 1955         iflag = t->c_iflag;
 1956         if (!(iflag & INPCK))
 1957                 opt |= CD1400_COR1_NOINPCK;
 1958         bits = 1 + 1;
 1959         /* stop bits */
 1960         if (cflag & CSTOPB) {
 1961                 ++bits;
 1962                 opt |= CD1400_COR1_STOP2;
 1963         }
 1964         /* char length */
 1965         switch (cflag & CSIZE) {
 1966         case CS5:
 1967                 bits += 5;
 1968                 opt |= CD1400_COR1_CS5;
 1969                 break;
 1970         case CS6:
 1971                 bits += 6;
 1972                 opt |= CD1400_COR1_CS6;
 1973                 break;
 1974         case CS7:
 1975                 bits += 7;
 1976                 opt |= CD1400_COR1_CS7;
 1977                 break;
 1978         default:
 1979                 bits += 8;
 1980                 opt |= CD1400_COR1_CS8;
 1981                 break;
 1982         }
 1983         cor_change = 0;
 1984         if (opt != com->cor[0]) {
 1985                 cor_change |= CD1400_CCR_COR1;
 1986                 cd_setreg(com, CD1400_COR1, com->cor[0] = opt);
 1987         }
 1988 
 1989         /*
 1990          * Set receive time-out period, normally to max(one char time, 5 ms).
 1991          */
 1992         if (t->c_ispeed == 0)
 1993                 itimeout = cd_getreg(com, CD1400_RTPR);
 1994         else {
 1995                 itimeout = (1000 * bits + t->c_ispeed - 1) / t->c_ispeed;
 1996 #ifdef SOFT_HOTCHAR
 1997 #define MIN_RTP         1
 1998 #else
 1999 #define MIN_RTP         5
 2000 #endif
 2001                 if (itimeout < MIN_RTP)
 2002                         itimeout = MIN_RTP;
 2003         }
 2004         if (!(t->c_lflag & ICANON) && t->c_cc[VMIN] != 0 && t->c_cc[VTIME] != 0
 2005             && t->c_cc[VTIME] * 10 > itimeout)
 2006                 itimeout = t->c_cc[VTIME] * 10;
 2007         if (itimeout > 255)
 2008                 itimeout = 255;
 2009         cd_setreg(com, CD1400_RTPR, itimeout);
 2010 
 2011         /*
 2012          * set channel option register 2 -
 2013          *      flow control
 2014          */
 2015         opt = 0;
 2016 #ifdef Smarts
 2017         if (iflag & IXANY)
 2018                 opt |= CD1400_COR2_IXANY;
 2019         if (iflag & IXOFF)
 2020                 opt |= CD1400_COR2_IXOFF;
 2021 #endif
 2022 #ifndef SOFT_CTS_OFLOW
 2023         if (cflag & CCTS_OFLOW)
 2024                 opt |= CD1400_COR2_CCTS_OFLOW;
 2025 #endif
 2026         critical_enter();
 2027         COM_LOCK();
 2028         if (opt != com->cor[1]) {
 2029                 cor_change |= CD1400_CCR_COR2;
 2030                 cd_setreg(com, CD1400_COR2, com->cor[1] = opt);
 2031         }
 2032         COM_UNLOCK();
 2033         critical_exit();
 2034 
 2035         /*
 2036          * set channel option register 3 -
 2037          *      receiver FIFO interrupt threshold
 2038          *      flow control
 2039          */
 2040         opt = RxFifoThreshold;
 2041 #ifdef Smarts
 2042         if (t->c_lflag & ICANON)
 2043                 opt |= CD1400_COR3_SCD34;       /* detect INTR & SUSP chars */
 2044         if (iflag & IXOFF)
 2045                 /* detect and transparently handle START and STOP chars */
 2046                 opt |= CD1400_COR3_FCT | CD1400_COR3_SCD12;
 2047 #endif
 2048         if (opt != com->cor[2]) {
 2049                 cor_change |= CD1400_CCR_COR3;
 2050                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
 2051         }
 2052 
 2053         /* notify the CD1400 if COR1-3 have changed */
 2054         if (cor_change)
 2055                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | cor_change);
 2056 
 2057         /*
 2058          * set channel option register 4 -
 2059          *      CR/NL processing
 2060          *      break processing
 2061          *      received exception processing
 2062          */
 2063         opt = 0;
 2064         if (iflag & IGNCR)
 2065                 opt |= CD1400_COR4_IGNCR;
 2066 #ifdef Smarts
 2067         /*
 2068          * we need a new ttyinput() for this, as we don't want to
 2069          * have ICRNL && INLCR being done in both layers, or to have
 2070          * synchronisation problems
 2071          */
 2072         if (iflag & ICRNL)
 2073                 opt |= CD1400_COR4_ICRNL;
 2074         if (iflag & INLCR)
 2075                 opt |= CD1400_COR4_INLCR;
 2076 #endif
 2077         if (iflag & IGNBRK)
 2078                 opt |= CD1400_COR4_IGNBRK | CD1400_COR4_NOBRKINT;
 2079         /*
 2080          * The `-ignbrk -brkint parmrk' case is not handled by the hardware,
 2081          * so only tell the hardware about -brkint if -parmrk.
 2082          */
 2083         if (!(iflag & (BRKINT | PARMRK)))
 2084                 opt |= CD1400_COR4_NOBRKINT;
 2085 #if 0
 2086         /* XXX using this "intelligence" breaks reporting of overruns. */
 2087         if (iflag & IGNPAR)
 2088                 opt |= CD1400_COR4_PFO_DISCARD;
 2089         else {
 2090                 if (iflag & PARMRK)
 2091                         opt |= CD1400_COR4_PFO_ESC;
 2092                 else
 2093                         opt |= CD1400_COR4_PFO_NUL;
 2094         }
 2095 #else
 2096         opt |= CD1400_COR4_PFO_EXCEPTION;
 2097 #endif
 2098         cd_setreg(com, CD1400_COR4, opt);
 2099 
 2100         /*
 2101          * set channel option register 5 -
 2102          */
 2103         opt = 0;
 2104         if (iflag & ISTRIP)
 2105                 opt |= CD1400_COR5_ISTRIP;
 2106         if (t->c_iflag & IEXTEN)
 2107                 /* enable LNEXT (e.g. ctrl-v quoting) handling */
 2108                 opt |= CD1400_COR5_LNEXT;
 2109 #ifdef Smarts
 2110         if (t->c_oflag & ONLCR)
 2111                 opt |= CD1400_COR5_ONLCR;
 2112         if (t->c_oflag & OCRNL)
 2113                 opt |= CD1400_COR5_OCRNL;
 2114 #endif
 2115         cd_setreg(com, CD1400_COR5, opt);
 2116 
 2117         /*
 2118          * We always generate modem status change interrupts for CD changes.
 2119          * Among other things, this is necessary to track TS_CARR_ON for
 2120          * pstat to print even when the driver doesn't care.  CD changes
 2121          * should be rare so interrupts for them are not worth extra code to
 2122          * avoid.  We avoid interrupts for other modem status changes (except
 2123          * for CTS changes when SOFT_CTS_OFLOW is configured) since this is
 2124          * simplest and best.
 2125          */
 2126 
 2127         /*
 2128          * set modem change option register 1
 2129          *      generate modem interrupts on which 1 -> 0 input transitions
 2130          *      also controls auto-DTR output flow-control, which we don't use
 2131          */
 2132         opt = CD1400_MCOR1_CDzd;
 2133 #ifdef SOFT_CTS_OFLOW
 2134         if (cflag & CCTS_OFLOW)
 2135                 opt |= CD1400_MCOR1_CTSzd;
 2136 #endif
 2137         cd_setreg(com, CD1400_MCOR1, opt);
 2138 
 2139         /*
 2140          * set modem change option register 2
 2141          *      generate modem interrupts on specific 0 -> 1 input transitions
 2142          */
 2143         opt = CD1400_MCOR2_CDod;
 2144 #ifdef SOFT_CTS_OFLOW
 2145         if (cflag & CCTS_OFLOW)
 2146                 opt |= CD1400_MCOR2_CTSod;
 2147 #endif
 2148         cd_setreg(com, CD1400_MCOR2, opt);
 2149 
 2150         /*
 2151          * XXX should have done this long ago, but there is too much state
 2152          * to change all atomically.
 2153          */
 2154         critical_enter();
 2155         COM_LOCK();
 2156 
 2157         com->state &= ~CS_TTGO;
 2158         if (!(tp->t_state & TS_TTSTOP))
 2159                 com->state |= CS_TTGO;
 2160         if (cflag & CRTS_IFLOW) {
 2161                 com->state |= CS_RTS_IFLOW;
 2162                 /*
 2163                  * If CS_RTS_IFLOW just changed from off to on, the change
 2164                  * needs to be propagated to MCR_RTS.  This isn't urgent,
 2165                  * so do it later by calling comstart() instead of repeating
 2166                  * a lot of code from comstart() here.
 2167                  */
 2168         } else if (com->state & CS_RTS_IFLOW) {
 2169                 com->state &= ~CS_RTS_IFLOW;
 2170                 /*
 2171                  * CS_RTS_IFLOW just changed from on to off.  Force MCR_RTS
 2172                  * on here, since comstart() won't do it later.
 2173                  */
 2174 #if 0
 2175                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
 2176 #else
 2177                 cd_setreg(com, com->mcr_rts_reg,
 2178                           com->mcr_image |= com->mcr_rts);
 2179 #endif
 2180         }
 2181 
 2182         /*
 2183          * Set up state to handle output flow control.
 2184          * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
 2185          * Now has 10+ msec latency, while CTS flow has 50- usec latency.
 2186          */
 2187         com->state |= CS_ODEVREADY;
 2188 #ifdef SOFT_CTS_OFLOW
 2189         com->state &= ~CS_CTS_OFLOW;
 2190         if (cflag & CCTS_OFLOW) {
 2191                 com->state |= CS_CTS_OFLOW;
 2192                 if (!(com->last_modem_status & MSR_CTS))
 2193                         com->state &= ~CS_ODEVREADY;
 2194         }
 2195 #endif
 2196         /* XXX shouldn't call functions while intrs are disabled. */
 2197         disc_optim(tp, t, com);
 2198 #if 0
 2199         /*
 2200          * Recover from fiddling with CS_TTGO.  We used to call siointr1()
 2201          * unconditionally, but that defeated the careful discarding of
 2202          * stale input in sioopen().
 2203          */
 2204         if (com->state >= (CS_BUSY | CS_TTGO))
 2205                 siointr1(com);
 2206 #endif
 2207         if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
 2208                 if (!(com->intr_enable & CD1400_SRER_TXRDY))
 2209                         cd_setreg(com, CD1400_SRER,
 2210                                   com->intr_enable
 2211                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
 2212                                     | CD1400_SRER_TXRDY);
 2213         } else {
 2214                 if (com->intr_enable & CD1400_SRER_TXRDY)
 2215                         cd_setreg(com, CD1400_SRER,
 2216                                   com->intr_enable
 2217                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
 2218                                     | CD1400_SRER_TXMPTY);
 2219         }
 2220 
 2221         COM_UNLOCK();
 2222         critical_exit();
 2223         splx(s);
 2224         comstart(tp);
 2225         if (com->ibufold != NULL) {
 2226                 free(com->ibufold, M_DEVBUF);
 2227                 com->ibufold = NULL;
 2228         }
 2229         return (0);
 2230 }
 2231 
 2232 static int
 2233 siosetwater(com, speed)
 2234         struct com_s    *com;
 2235         speed_t         speed;
 2236 {
 2237         int             cp4ticks;
 2238         u_char          *ibuf;
 2239         int             ibufsize;
 2240         struct tty      *tp;
 2241 
 2242         /*
 2243          * Make the buffer size large enough to handle a softtty interrupt
 2244          * latency of about 2 ticks without loss of throughput or data
 2245          * (about 3 ticks if input flow control is not used or not honoured,
 2246          * but a bit less for CS5-CS7 modes).
 2247          */
 2248         cp4ticks = speed / 10 / hz * 4;
 2249         for (ibufsize = 128; ibufsize < cp4ticks;)
 2250                 ibufsize <<= 1;
 2251         if (ibufsize == com->ibufsize) {
 2252                 return (0);
 2253         }
 2254 
 2255         /*
 2256          * Allocate input buffer.  The extra factor of 2 in the size is
 2257          * to allow for an error byte for each input byte.
 2258          */
 2259         ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT);
 2260         if (ibuf == NULL) {
 2261                 return (ENOMEM);
 2262         }
 2263 
 2264         /* Initialize non-critical variables. */
 2265         com->ibufold = com->ibuf;
 2266         com->ibufsize = ibufsize;
 2267         tp = com->tp;
 2268         if (tp != NULL) {
 2269                 tp->t_ififosize = 2 * ibufsize;
 2270                 tp->t_ispeedwat = (speed_t)-1;
 2271                 tp->t_ospeedwat = (speed_t)-1;
 2272         }
 2273 
 2274         /*
 2275          * Read current input buffer, if any.  Continue with interrupts
 2276          * disabled.
 2277          */
 2278         critical_enter();
 2279         COM_LOCK();
 2280         if (com->iptr != com->ibuf)
 2281                 sioinput(com);
 2282 
 2283         /*-
 2284          * Initialize critical variables, including input buffer watermarks.
 2285          * The external device is asked to stop sending when the buffer
 2286          * exactly reaches high water, or when the high level requests it.
 2287          * The high level is notified immediately (rather than at a later
 2288          * clock tick) when this watermark is reached.
 2289          * The buffer size is chosen so the watermark should almost never
 2290          * be reached.
 2291          * The low watermark is invisibly 0 since the buffer is always
 2292          * emptied all at once.
 2293          */
 2294         com->iptr = com->ibuf = ibuf;
 2295         com->ibufend = ibuf + ibufsize;
 2296         com->ierroff = ibufsize;
 2297         com->ihighwater = ibuf + 3 * ibufsize / 4;
 2298 
 2299         COM_UNLOCK();
 2300         critical_exit();
 2301         return (0);
 2302 }
 2303 
 2304 static void
 2305 comstart(tp)
 2306         struct tty      *tp;
 2307 {
 2308         struct com_s    *com;
 2309         int             s;
 2310 #ifdef CyDebug
 2311         bool_t          started;
 2312 #endif
 2313         int             unit;
 2314 
 2315         unit = DEV_TO_UNIT(tp->t_dev);
 2316         com = com_addr(unit);
 2317         s = spltty();
 2318 
 2319 #ifdef CyDebug
 2320         ++com->start_count;
 2321         started = FALSE;
 2322 #endif
 2323 
 2324         critical_enter();
 2325         COM_LOCK();
 2326         if (tp->t_state & TS_TTSTOP) {
 2327                 com->state &= ~CS_TTGO;
 2328                 if (com->intr_enable & CD1400_SRER_TXRDY)
 2329                         cd_setreg(com, CD1400_SRER,
 2330                                   com->intr_enable
 2331                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
 2332                                     | CD1400_SRER_TXMPTY);
 2333         } else {
 2334                 com->state |= CS_TTGO;
 2335                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)
 2336                     && !(com->intr_enable & CD1400_SRER_TXRDY))
 2337                         cd_setreg(com, CD1400_SRER,
 2338                                   com->intr_enable
 2339                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
 2340                                     | CD1400_SRER_TXRDY);
 2341         }
 2342         if (tp->t_state & TS_TBLOCK) {
 2343                 if (com->mcr_image & com->mcr_rts && com->state & CS_RTS_IFLOW)
 2344 #if 0
 2345                         outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
 2346 #else
 2347                         cd_setreg(com, com->mcr_rts_reg,
 2348                                   com->mcr_image &= ~com->mcr_rts);
 2349 #endif
 2350         } else {
 2351                 if (!(com->mcr_image & com->mcr_rts)
 2352                     && com->iptr < com->ihighwater
 2353                     && com->state & CS_RTS_IFLOW)
 2354 #if 0
 2355                         outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
 2356 #else
 2357                         cd_setreg(com, com->mcr_rts_reg,
 2358                                   com->mcr_image |= com->mcr_rts);
 2359 #endif
 2360         }
 2361         COM_UNLOCK();
 2362         critical_exit();
 2363         if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
 2364                 ttwwakeup(tp);
 2365                 splx(s);
 2366                 return;
 2367         }
 2368         if (tp->t_outq.c_cc != 0) {
 2369                 struct lbq      *qp;
 2370                 struct lbq      *next;
 2371 
 2372                 if (!com->obufs[0].l_queued) {
 2373 #ifdef CyDebug
 2374                         started = TRUE;
 2375 #endif
 2376                         com->obufs[0].l_tail
 2377                             = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
 2378                                                   sizeof com->obuf1);
 2379                         com->obufs[0].l_next = NULL;
 2380                         com->obufs[0].l_queued = TRUE;
 2381                         critical_enter();
 2382                         COM_LOCK();
 2383                         if (com->state & CS_BUSY) {
 2384                                 qp = com->obufq.l_next;
 2385                                 while ((next = qp->l_next) != NULL)
 2386                                         qp = next;
 2387                                 qp->l_next = &com->obufs[0];
 2388                         } else {
 2389                                 com->obufq.l_head = com->obufs[0].l_head;
 2390                                 com->obufq.l_tail = com->obufs[0].l_tail;
 2391                                 com->obufq.l_next = &com->obufs[0];
 2392                                 com->state |= CS_BUSY;
 2393                                 if (com->state >= (CS_BUSY | CS_TTGO
 2394                                                    | CS_ODEVREADY))
 2395                                         cd_setreg(com, CD1400_SRER,
 2396                                                   com->intr_enable
 2397                                                   = (com->intr_enable
 2398                                                     & ~CD1400_SRER_TXMPTY)
 2399                                                     | CD1400_SRER_TXRDY);
 2400                         }
 2401                         COM_UNLOCK();
 2402                         critical_exit();
 2403                 }
 2404                 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
 2405 #ifdef CyDebug
 2406                         started = TRUE;
 2407 #endif
 2408                         com->obufs[1].l_tail
 2409                             = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
 2410                                                   sizeof com->obuf2);
 2411                         com->obufs[1].l_next = NULL;
 2412                         com->obufs[1].l_queued = TRUE;
 2413                         critical_enter();
 2414                         COM_LOCK();
 2415                         if (com->state & CS_BUSY) {
 2416                                 qp = com->obufq.l_next;
 2417                                 while ((next = qp->l_next) != NULL)
 2418                                         qp = next;
 2419                                 qp->l_next = &com->obufs[1];
 2420                         } else {
 2421                                 com->obufq.l_head = com->obufs[1].l_head;
 2422                                 com->obufq.l_tail = com->obufs[1].l_tail;
 2423                                 com->obufq.l_next = &com->obufs[1];
 2424                                 com->state |= CS_BUSY;
 2425                                 if (com->state >= (CS_BUSY | CS_TTGO
 2426                                                    | CS_ODEVREADY))
 2427                                         cd_setreg(com, CD1400_SRER,
 2428                                                   com->intr_enable
 2429                                                   = (com->intr_enable
 2430                                                     & ~CD1400_SRER_TXMPTY)
 2431                                                     | CD1400_SRER_TXRDY);
 2432                         }
 2433                         COM_UNLOCK();
 2434                         critical_exit();
 2435                 }
 2436                 tp->t_state |= TS_BUSY;
 2437         }
 2438 #ifdef CyDebug
 2439         if (started)
 2440                 ++com->start_real;
 2441 #endif
 2442 #if 0
 2443         critical_enter();
 2444         COM_LOCK();
 2445         if (com->state >= (CS_BUSY | CS_TTGO))
 2446                 siointr1(com);  /* fake interrupt to start output */
 2447         COM_UNLOCK();
 2448         critical_exit();
 2449 #endif
 2450         ttwwakeup(tp);
 2451         splx(s);
 2452 }
 2453 
 2454 static void
 2455 comstop(tp, rw)
 2456         struct tty      *tp;
 2457         int             rw;
 2458 {
 2459         struct com_s    *com;
 2460         bool_t          wakeup_etc;
 2461 
 2462         com = com_addr(DEV_TO_UNIT(tp->t_dev));
 2463         wakeup_etc = FALSE;
 2464         critical_enter();
 2465         COM_LOCK();
 2466         if (rw & FWRITE) {
 2467                 com->obufs[0].l_queued = FALSE;
 2468                 com->obufs[1].l_queued = FALSE;
 2469                 if (com->extra_state & CSE_ODONE) {
 2470                         com_events -= LOTS_OF_EVENTS;
 2471                         com->extra_state &= ~CSE_ODONE;
 2472                         if (com->etc != ETC_NONE) {
 2473                                 if (com->etc == ETC_BREAK_ENDED)
 2474                                         com->etc = ETC_NONE;
 2475                                 wakeup_etc = TRUE;
 2476                         }
 2477                 }
 2478                 com->tp->t_state &= ~TS_BUSY;
 2479                 if (com->state & CS_ODONE)
 2480                         com_events -= LOTS_OF_EVENTS;
 2481                 com->state &= ~(CS_ODONE | CS_BUSY);
 2482         }
 2483         if (rw & FREAD) {
 2484                 /* XXX no way to reset only input fifo. */
 2485                 com_events -= (com->iptr - com->ibuf);
 2486                 com->iptr = com->ibuf;
 2487         }
 2488         COM_UNLOCK();
 2489         critical_exit();
 2490         if (wakeup_etc)
 2491                 wakeup(&com->etc);
 2492         if (rw & FWRITE && com->etc == ETC_NONE)
 2493                 cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
 2494         comstart(tp);
 2495 }
 2496 
 2497 static int
 2498 commctl(com, bits, how)
 2499         struct com_s    *com;
 2500         int             bits;
 2501         int             how;
 2502 {
 2503         int     mcr;
 2504         int     msr;
 2505 
 2506         if (how == DMGET) {
 2507                 if (com->channel_control & CD1400_CCR_RCVEN)
 2508                         bits |= TIOCM_LE;
 2509                 mcr = com->mcr_image;
 2510                 if (mcr & com->mcr_dtr)
 2511                         bits |= TIOCM_DTR;
 2512                 if (mcr & com->mcr_rts)
 2513                         /* XXX wired on for Cyclom-8Ys */
 2514                         bits |= TIOCM_RTS;
 2515 
 2516                 /*
 2517                  * We must read the modem status from the hardware because
 2518                  * we don't generate modem status change interrupts for all
 2519                  * changes, so com->prev_modem_status is not guaranteed to
 2520                  * be up to date.  This is safe, unlike for sio, because
 2521                  * reading the status register doesn't clear pending modem
 2522                  * status change interrupts.
 2523                  */
 2524                 msr = cd_getreg(com, CD1400_MSVR2);
 2525 
 2526                 if (msr & MSR_CTS)
 2527                         bits |= TIOCM_CTS;
 2528                 if (msr & MSR_DCD)
 2529                         bits |= TIOCM_CD;
 2530                 if (msr & MSR_DSR)
 2531                         bits |= TIOCM_DSR;
 2532                 if (msr & MSR_RI)
 2533                         /* XXX not connected except for Cyclom-16Y? */
 2534                         bits |= TIOCM_RI;
 2535                 return (bits);
 2536         }
 2537         mcr = 0;
 2538         if (bits & TIOCM_DTR)
 2539                 mcr |= com->mcr_dtr;
 2540         if (bits & TIOCM_RTS)
 2541                 mcr |= com->mcr_rts;
 2542         critical_enter();
 2543         COM_LOCK();
 2544         switch (how) {
 2545         case DMSET:
 2546                 com->mcr_image = mcr;
 2547                 cd_setreg(com, CD1400_MSVR1, mcr);
 2548                 cd_setreg(com, CD1400_MSVR2, mcr);
 2549                 break;
 2550         case DMBIS:
 2551                 com->mcr_image = mcr = com->mcr_image | mcr;
 2552                 cd_setreg(com, CD1400_MSVR1, mcr);
 2553                 cd_setreg(com, CD1400_MSVR2, mcr);
 2554                 break;
 2555         case DMBIC:
 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         }
 2561         COM_UNLOCK();
 2562         critical_exit();
 2563         return (0);
 2564 }
 2565 
 2566 static void
 2567 siosettimeout()
 2568 {
 2569         struct com_s    *com;
 2570         bool_t          someopen;
 2571         int             unit;
 2572 
 2573         /*
 2574          * Set our timeout period to 1 second if no polled devices are open.
 2575          * Otherwise set it to max(1/200, 1/hz).
 2576          * Enable timeouts iff some device is open.
 2577          */
 2578         untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
 2579         sio_timeout = hz;
 2580         someopen = FALSE;
 2581         for (unit = 0; unit < NSIO; ++unit) {
 2582                 com = com_addr(unit);
 2583                 if (com != NULL && com->tp != NULL
 2584                     && com->tp->t_state & TS_ISOPEN) {
 2585                         someopen = TRUE;
 2586 #if 0
 2587                         if (com->poll || com->poll_output) {
 2588                                 sio_timeout = hz > 200 ? hz / 200 : 1;
 2589                                 break;
 2590                         }
 2591 #endif
 2592                 }
 2593         }
 2594         if (someopen) {
 2595                 sio_timeouts_until_log = hz / sio_timeout;
 2596                 sio_timeout_handle = timeout(comwakeup, (void *)NULL,
 2597                                              sio_timeout);
 2598         } else {
 2599                 /* Flush error messages, if any. */
 2600                 sio_timeouts_until_log = 1;
 2601                 comwakeup((void *)NULL);
 2602                 untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
 2603         }
 2604 }
 2605 
 2606 static void
 2607 comwakeup(chan)
 2608         void    *chan;
 2609 {
 2610         struct com_s    *com;
 2611         int             unit;
 2612 
 2613         sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout);
 2614 
 2615 #if 0
 2616         /*
 2617          * Recover from lost output interrupts.
 2618          * Poll any lines that don't use interrupts.
 2619          */
 2620         for (unit = 0; unit < NSIO; ++unit) {
 2621                 com = com_addr(unit);
 2622                 if (com != NULL
 2623                     && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
 2624                         critical_enter();
 2625                         COM_LOCK();
 2626                         siointr1(com);
 2627                         COM_UNLOCK();
 2628                         critical_exit();
 2629                 }
 2630         }
 2631 #endif
 2632 
 2633         /*
 2634          * Check for and log errors, but not too often.
 2635          */
 2636         if (--sio_timeouts_until_log > 0)
 2637                 return;
 2638         sio_timeouts_until_log = hz / sio_timeout;
 2639         for (unit = 0; unit < NSIO; ++unit) {
 2640                 int     errnum;
 2641 
 2642                 com = com_addr(unit);
 2643                 if (com == NULL)
 2644                         continue;
 2645                 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
 2646                         u_int   delta;
 2647                         u_long  total;
 2648 
 2649                         critical_enter();
 2650                         COM_LOCK();
 2651                         delta = com->delta_error_counts[errnum];
 2652                         com->delta_error_counts[errnum] = 0;
 2653                         COM_UNLOCK();
 2654                         critical_exit();
 2655                         if (delta == 0)
 2656                                 continue;
 2657                         total = com->error_counts[errnum] += delta;
 2658                         log(LOG_ERR, "cy%d: %u more %s%s (total %lu)\n",
 2659                             unit, delta, error_desc[errnum],
 2660                             delta == 1 ? "" : "s", total);
 2661                 }
 2662         }
 2663 }
 2664 
 2665 static void
 2666 disc_optim(tp, t, com)
 2667         struct tty      *tp;
 2668         struct termios  *t;
 2669         struct com_s    *com;
 2670 {
 2671 #ifndef SOFT_HOTCHAR
 2672         u_char  opt;
 2673 #endif
 2674 
 2675         /*
 2676          * XXX can skip a lot more cases if Smarts.  Maybe
 2677          * (IGNCR | ISTRIP | IXON) in c_iflag.  But perhaps we
 2678          * shouldn't skip if (TS_CNTTB | TS_LNCH) is set in t_state.
 2679          */
 2680         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
 2681             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
 2682             && (!(t->c_iflag & PARMRK)
 2683                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
 2684             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
 2685             && linesw[tp->t_line].l_rint == ttyinput)
 2686                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
 2687         else
 2688                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
 2689         com->hotchar = linesw[tp->t_line].l_hotchar;
 2690 #ifndef SOFT_HOTCHAR
 2691         opt = com->cor[2] & ~CD1400_COR3_SCD34;
 2692         if (com->hotchar != 0) {
 2693                 cd_setreg(com, CD1400_SCHR3, com->hotchar);
 2694                 cd_setreg(com, CD1400_SCHR4, com->hotchar);
 2695                 opt |= CD1400_COR3_SCD34;
 2696         }
 2697         if (opt != com->cor[2]) {
 2698                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
 2699                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | CD1400_CCR_COR3);
 2700         }
 2701 #endif
 2702 }
 2703 
 2704 #ifdef Smarts
 2705 /* standard line discipline input routine */
 2706 int
 2707 cyinput(c, tp)
 2708         int             c;
 2709         struct tty      *tp;
 2710 {
 2711         /* XXX duplicate ttyinput(), but without the IXOFF/IXON/ISTRIP/IPARMRK
 2712          * bits, as they are done by the CD1400.  Hardly worth the effort,
 2713          * given that high-throughput sessions are raw anyhow.
 2714          */
 2715 }
 2716 #endif /* Smarts */
 2717 
 2718 static int
 2719 comspeed(speed, cy_clock, prescaler_io)
 2720         speed_t speed;
 2721         u_long  cy_clock;
 2722         int     *prescaler_io;
 2723 {
 2724         int     actual;
 2725         int     error;
 2726         int     divider;
 2727         int     prescaler;
 2728         int     prescaler_unit;
 2729 
 2730         if (speed == 0)
 2731                 return (0);
 2732         if (speed < 0 || speed > 150000)
 2733                 return (-1);
 2734 
 2735         /* determine which prescaler to use */
 2736         for (prescaler_unit = 4, prescaler = 2048; prescaler_unit;
 2737                 prescaler_unit--, prescaler >>= 2) {
 2738                 if (cy_clock / prescaler / speed > 63)
 2739                         break;
 2740         }
 2741 
 2742         divider = (cy_clock / prescaler * 2 / speed + 1) / 2; /* round off */
 2743         if (divider > 255)
 2744                 divider = 255;
 2745         actual = cy_clock/prescaler/divider;
 2746 
 2747         /* 10 times error in percent: */
 2748         error = ((actual - (long)speed) * 2000 / (long)speed + 1) / 2;
 2749 
 2750         /* 3.0% max error tolerance */
 2751         if (error < -30 || error > 30)
 2752                 return (-1);
 2753 
 2754 #if 0
 2755         printf("prescaler = %d (%d)\n", prescaler, prescaler_unit);
 2756         printf("divider = %d (%x)\n", divider, divider);
 2757         printf("actual = %d\n", actual);
 2758         printf("error = %d\n", error);
 2759 #endif
 2760 
 2761         *prescaler_io = prescaler_unit;
 2762         return (divider);
 2763 }
 2764 
 2765 static void
 2766 cd1400_channel_cmd(com, cmd)
 2767         struct com_s    *com;
 2768         int             cmd;
 2769 {
 2770         cd1400_channel_cmd_wait(com);
 2771         cd_setreg(com, CD1400_CCR, cmd);
 2772         cd1400_channel_cmd_wait(com);
 2773 }
 2774 
 2775 static void
 2776 cd1400_channel_cmd_wait(com)
 2777         struct com_s    *com;
 2778 {
 2779         struct timeval  start;
 2780         struct timeval  tv;
 2781         long            usec;
 2782 
 2783         if (cd_getreg(com, CD1400_CCR) == 0)
 2784                 return;
 2785         microtime(&start);
 2786         for (;;) {
 2787                 if (cd_getreg(com, CD1400_CCR) == 0)
 2788                         return;
 2789                 microtime(&tv);
 2790                 usec = 1000000 * (tv.tv_sec - start.tv_sec) +
 2791                     tv.tv_usec - start.tv_usec;
 2792                 if (usec >= 5000) {
 2793                         log(LOG_ERR,
 2794                             "cy%d: channel command timeout (%ld usec)\n",
 2795                             com->unit, usec);
 2796                         return;
 2797                 }
 2798         }
 2799 }
 2800 
 2801 static void
 2802 cd_etc(com, etc)
 2803         struct com_s    *com;
 2804         int             etc;
 2805 {
 2806 
 2807         /*
 2808          * We can't change the hardware's ETC state while there are any
 2809          * characters in the tx fifo, since those characters would be
 2810          * interpreted as commands!  Unputting characters from the fifo
 2811          * is difficult, so we wait up to 12 character times for the fifo
 2812          * to drain.  The command will be delayed for up to 2 character
 2813          * times for the tx to become empty.  Unputting characters from
 2814          * the tx holding and shift registers is impossible, so we wait
 2815          * for the tx to become empty so that the command is sure to be
 2816          * executed soon after we issue it.
 2817          */
 2818         critical_enter();
 2819         COM_LOCK();
 2820         if (com->etc == etc)
 2821                 goto wait;
 2822         if ((etc == CD1400_ETC_SENDBREAK
 2823             && (com->etc == ETC_BREAK_STARTING
 2824                 || com->etc == ETC_BREAK_STARTED))
 2825             || (etc == CD1400_ETC_STOPBREAK
 2826                && (com->etc == ETC_BREAK_ENDING || com->etc == ETC_BREAK_ENDED
 2827                    || com->etc == ETC_NONE))) {
 2828                 COM_UNLOCK();
 2829                 critical_exit();
 2830                 return;
 2831         }
 2832         com->etc = etc;
 2833         cd_setreg(com, CD1400_SRER,
 2834                   com->intr_enable
 2835                   = (com->intr_enable & ~CD1400_SRER_TXRDY) | CD1400_SRER_TXMPTY);
 2836 wait:
 2837         COM_UNLOCK();
 2838         critical_exit();
 2839         while (com->etc == etc
 2840                && tsleep(&com->etc, TTIPRI | PCATCH, "cyetc", 0) == 0)
 2841                 continue;
 2842 }
 2843 
 2844 static int
 2845 cd_getreg(com, reg)
 2846         struct com_s    *com;
 2847         int             reg;
 2848 {
 2849         struct com_s    *basecom;
 2850         u_char  car;
 2851         int     cy_align;
 2852         register_t      eflags;
 2853         cy_addr iobase;
 2854         int     val;
 2855 
 2856         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
 2857         car = com->unit & CD1400_CAR_CHAN;
 2858         cy_align = com->cy_align;
 2859         iobase = com->iobase;
 2860         eflags = read_eflags();
 2861         critical_enter();
 2862         if (eflags & PSL_I)
 2863                 COM_LOCK();
 2864         if (basecom->car != car)
 2865                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
 2866         val = cd_inb(iobase, reg, cy_align);
 2867         if (eflags & PSL_I)
 2868                 COM_UNLOCK();
 2869         critical_exit();
 2870         return (val);
 2871 }
 2872 
 2873 static void
 2874 cd_setreg(com, reg, val)
 2875         struct com_s    *com;
 2876         int             reg;
 2877         int             val;
 2878 {
 2879         struct com_s    *basecom;
 2880         u_char  car;
 2881         int     cy_align;
 2882         register_t      eflags;
 2883         cy_addr iobase;
 2884 
 2885         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
 2886         car = com->unit & CD1400_CAR_CHAN;
 2887         cy_align = com->cy_align;
 2888         iobase = com->iobase;
 2889         eflags = read_eflags();
 2890         critical_enter();
 2891         if (eflags & PSL_I)
 2892                 COM_LOCK();
 2893         if (basecom->car != car)
 2894                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
 2895         cd_outb(iobase, reg, cy_align, val);
 2896         if (eflags & PSL_I)
 2897                 COM_UNLOCK();
 2898         critical_exit();
 2899 }
 2900 
 2901 #ifdef CyDebug
 2902 /* useful in ddb */
 2903 void
 2904 cystatus(unit)
 2905         int     unit;
 2906 {
 2907         struct com_s    *com;
 2908         cy_addr         iobase;
 2909         u_int           ocount;
 2910         struct tty      *tp;
 2911 
 2912         com = com_addr(unit);
 2913         printf("info for channel %d\n", unit);
 2914         printf("------------------\n");
 2915         printf("total cyclom service probes:\t%d\n", cy_svrr_probes);
 2916         printf("calls to upper layer:\t\t%d\n", cy_timeouts);
 2917         if (com == NULL)
 2918                 return;
 2919         iobase = com->iobase;
 2920         printf("\n");
 2921         printf("cd1400 base address:\\tt%p\n", iobase);
 2922         printf("saved channel_control:\t\t0x%02x\n", com->channel_control);
 2923         printf("saved cor1-3:\t\t\t0x%02x 0x%02x 0x%02x\n",
 2924                com->cor[0], com->cor[1], com->cor[2]);
 2925         printf("service request enable reg:\t0x%02x (0x%02x cached)\n",
 2926                cd_getreg(com, CD1400_SRER), com->intr_enable);
 2927         printf("service request register:\t0x%02x\n",
 2928                cd_inb(iobase, CD1400_SVRR, com->cy_align));
 2929         printf("modem status:\t\t\t0x%02x (0x%02x cached)\n",
 2930                cd_getreg(com, CD1400_MSVR2), com->prev_modem_status);
 2931         printf("rx/tx/mdm interrupt registers:\t0x%02x 0x%02x 0x%02x\n",
 2932                cd_inb(iobase, CD1400_RIR, com->cy_align),
 2933                cd_inb(iobase, CD1400_TIR, com->cy_align),
 2934                cd_inb(iobase, CD1400_MIR, com->cy_align));
 2935         printf("\n");
 2936         printf("com state:\t\t\t0x%02x\n", com->state);
 2937         printf("calls to comstart():\t\t%d (%d useful)\n",
 2938                com->start_count, com->start_real);
 2939         printf("rx buffer chars free:\t\t%d\n", com->iptr - com->ibuf);
 2940         ocount = 0;
 2941         if (com->obufs[0].l_queued)
 2942                 ocount += com->obufs[0].l_tail - com->obufs[0].l_head;
 2943         if (com->obufs[1].l_queued)
 2944                 ocount += com->obufs[1].l_tail - com->obufs[1].l_head;
 2945         printf("tx buffer chars:\t\t%u\n", ocount);
 2946         printf("received chars:\t\t\t%d\n", com->bytes_in);
 2947         printf("received exceptions:\t\t%d\n", com->recv_exception);
 2948         printf("modem signal deltas:\t\t%d\n", com->mdm);
 2949         printf("transmitted chars:\t\t%d\n", com->bytes_out);
 2950         printf("\n");
 2951         tp = com->tp;
 2952         if (tp != NULL) {
 2953                 printf("tty state:\t\t\t0x%08x\n", tp->t_state);
 2954                 printf(
 2955                 "upper layer queue lengths:\t%d raw, %d canon, %d output\n",
 2956                        tp->t_rawq.c_cc, tp->t_canq.c_cc, tp->t_outq.c_cc);
 2957         } else
 2958                 printf("tty state:\t\t\tclosed\n");
 2959 }
 2960 #endif /* CyDebug */

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