Style(9) cleanup to src/sys/vfs, stage 20/21: umapfs.
[dragonfly.git] / sys / dev / serial / cy / cy.c
1 /*-
2  * cyclades cyclom-y serial driver
3  *      Andrew Herbert <andrew@werple.apana.org.au>, 17 August 1993
4  *
5  * Copyright (c) 1993 Andrew Herbert.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. The name Andrew Herbert may not be used to endorse or promote products
17  *    derived from this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY ``AS IS'' AND ANY EXPRESS OR IMPLIED
20  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
22  * NO EVENT SHALL I BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  *
30  * $FreeBSD: src/sys/i386/isa/cy.c,v 1.97.2.2 2001/08/22 13:04:58 bde Exp $
31  * $DragonFly: src/sys/dev/serial/cy/cy.c,v 1.10 2004/05/13 23:49:19 dillon Exp $
32  */
33
34 #include "opt_compat.h"
35 #include "use_cy.h"
36
37 /*
38  * TODO:
39  * Atomic COR change.
40  * Consoles.
41  */
42
43 /*
44  * Temporary compile-time configuration options.
45  */
46 #define RxFifoThreshold (CD1400_RX_FIFO_SIZE / 2)
47                         /* Number of chars in the receiver FIFO before an
48                          * an interrupt is generated.  Should depend on
49                          * line speed.  Needs to be about 6 on a 486DX33
50                          * for 4 active ports at 115200 bps.  Why doesn't
51                          * 10 work?
52                          */
53 #define PollMode        /* Use polling-based irq service routine, not the
54                          * hardware svcack lines.  Must be defined for
55                          * Cyclom-16Y boards.  Less efficient for Cyclom-8Ys,
56                          * and stops 4 * 115200 bps from working.
57                          */
58 #undef  Smarts          /* Enable slightly more CD1400 intelligence.  Mainly
59                          * the output CR/LF processing, plus we can avoid a
60                          * few checks usually done in ttyinput().
61                          *
62                          * XXX not fully implemented, and not particularly
63                          * worthwhile.
64                          */
65 #undef  CyDebug         /* Include debugging code (not very expensive). */
66
67 /* These will go away. */
68 #undef  SOFT_CTS_OFLOW
69 #define SOFT_HOTCHAR
70
71 #include <sys/param.h>
72 #include <sys/systm.h>
73 #include <sys/tty.h>
74 #include <sys/proc.h>
75 #include <sys/conf.h>
76 #include <sys/dkstat.h>
77 #include <sys/fcntl.h>
78 #include <sys/interrupt.h>
79 #include <sys/kernel.h>
80 #include <sys/malloc.h>
81 #include <sys/syslog.h>
82 #include <machine/clock.h>
83 #include <machine/ipl.h>
84 #ifndef SMP
85 #include <machine/lock.h>
86 #endif
87 #include <machine/psl.h>
88
89 #include <bus/isa/i386/isa_device.h>
90 #include "cyreg.h"
91 #include <i386/isa/ic/cd1400.h>
92
93 #ifdef SMP
94 #define disable_intr()  com_lock()
95 #define enable_intr()   com_unlock()
96 #endif /* SMP */
97
98 /*
99  * Dictionary so that I can name everything *sio* or *com* to compare with
100  * sio.c.  There is also lots of ugly formatting and unnecessary ifdefs to
101  * simplify the comparision.  These will go away.
102  */
103 #define LSR_BI          CD1400_RDSR_BREAK
104 #define LSR_FE          CD1400_RDSR_FE
105 #define LSR_OE          CD1400_RDSR_OE
106 #define LSR_PE          CD1400_RDSR_PE
107 #define MCR_DTR         CD1400_MSVR2_DTR
108 #define MCR_RTS         CD1400_MSVR1_RTS
109 #define MSR_CTS         CD1400_MSVR2_CTS
110 #define MSR_DCD         CD1400_MSVR2_CD
111 #define MSR_DSR         CD1400_MSVR2_DSR
112 #define MSR_RI          CD1400_MSVR2_RI
113 #define NSIO            (NCY * CY_MAX_PORTS)
114 #define comconsole      cyconsole
115 #define comdefaultrate  cydefaultrate
116 #define com_events      cy_events
117 #define comhardclose    cyhardclose
118 #define commctl         cymctl
119 #define comparam        cyparam
120 #define comspeed        cyspeed
121 #define comstart        cystart
122 #define comwakeup       cywakeup
123 #define nsio_tty        ncy_tty
124 #define p_com_addr      p_cy_addr
125 #define sioattach       cyattach
126 #define sioclose        cyclose
127 #define siodriver       cydriver
128 #define siodtrwakeup    cydtrwakeup
129 #define sioinput        cyinput
130 #define siointr         cyintr
131 #define siointr1        cyintr1
132 #define sioioctl        cyioctl
133 #define sioopen         cyopen
134 #define siopoll         cypoll
135 #define sioprobe        cyprobe
136 #define siosettimeout   cysettimeout
137 #define siosetwater     cysetwater
138 #define comstop         cystop
139 #define siowrite        cywrite
140 #define sio_registered  cy_registered
141 #define sio_timeout     cy_timeout
142 #define sio_timeout_handle cy_timeout_handle
143 #define sio_timeouts_until_log  cy_timeouts_until_log
144 #define sio_tty         cy_tty
145
146 #define CY_MAX_PORTS            (CD1400_NO_OF_CHANNELS * CY_MAX_CD1400s)
147
148 /* We encode the cyclom unit number (cyu) in spare bits in the IVR's. */
149 #define CD1400_xIVR_CHAN_SHIFT  3
150 #define CD1400_xIVR_CHAN        0x1F
151
152 /*
153  * ETC states.  com->etc may also contain a hardware ETC command value,
154  * meaning that execution of that command is pending.
155  */
156 #define ETC_NONE                0       /* we depend on bzero() setting this */
157 #define ETC_BREAK_STARTING      1
158 #define ETC_BREAK_STARTED       2
159 #define ETC_BREAK_ENDING        3
160 #define ETC_BREAK_ENDED         4
161
162 #define LOTS_OF_EVENTS  64      /* helps separate urgent events from input */
163
164 #define CALLOUT_MASK            0x80
165 #define CONTROL_MASK            0x60
166 #define CONTROL_INIT_STATE      0x20
167 #define CONTROL_LOCK_STATE      0x40
168 #define DEV_TO_UNIT(dev)        (MINOR_TO_UNIT(minor(dev)))
169 #define MINOR_MAGIC_MASK        (CALLOUT_MASK | CONTROL_MASK)
170 /*
171  * Not all of the magic is parametrized in the following macros.  16 and
172  * 0xff are related to the bitfields in a udev_t.  CY_MAX_PORTS must be
173  * ((0xff & ~MINOR_MAGIC_MASK) + 1) for things to work.
174  */
175 #define MINOR_TO_UNIT(mynor)    (((mynor) >> 16) * CY_MAX_PORTS \
176                                  | (((mynor) & 0xff) & ~MINOR_MAGIC_MASK))
177 #define UNIT_TO_MINOR(unit)     (((unit) / CY_MAX_PORTS) << 16 \
178                                  | (((unit) & 0xff) & ~MINOR_MAGIC_MASK))
179
180 /*
181  * com state bits.
182  * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
183  * than the other bits so that they can be tested as a group without masking
184  * off the low bits.
185  *
186  * The following com and tty flags correspond closely:
187  *      CS_BUSY         = TS_BUSY (maintained by comstart(), siopoll() and
188  *                                 comstop())
189  *      CS_TTGO         = ~TS_TTSTOP (maintained by comparam() and comstart())
190  *      CS_CTS_OFLOW    = CCTS_OFLOW (maintained by comparam())
191  *      CS_RTS_IFLOW    = CRTS_IFLOW (maintained by comparam())
192  * TS_FLUSH is not used.
193  * XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
194  * XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
195  */
196 #define CS_BUSY         0x80    /* output in progress */
197 #define CS_TTGO         0x40    /* output not stopped by XOFF */
198 #define CS_ODEVREADY    0x20    /* external device h/w ready (CTS) */
199 #define CS_CHECKMSR     1       /* check of MSR scheduled */
200 #define CS_CTS_OFLOW    2       /* use CTS output flow control */
201 #define CS_DTR_OFF      0x10    /* DTR held off */
202 #define CS_ODONE        4       /* output completed */
203 #define CS_RTS_IFLOW    8       /* use RTS input flow control */
204 #define CSE_ODONE       1       /* output transmitted */
205
206 static  char const * const      error_desc[] = {
207 #define CE_OVERRUN                      0
208         "silo overflow",
209 #define CE_INTERRUPT_BUF_OVERFLOW       1
210         "interrupt-level buffer overflow",
211 #define CE_TTY_BUF_OVERFLOW             2
212         "tty-level buffer overflow",
213 };
214
215 #define CE_NTYPES                       3
216 #define CE_RECORD(com, errnum)          (++(com)->delta_error_counts[errnum])
217
218 /* types.  XXX - should be elsewhere */
219 typedef u_char  bool_t;         /* boolean */
220 typedef u_char volatile *cy_addr;
221
222 /* queue of linear buffers */
223 struct lbq {
224         u_char  *l_head;        /* next char to process */
225         u_char  *l_tail;        /* one past the last char to process */
226         struct lbq *l_next;     /* next in queue */
227         bool_t  l_queued;       /* nonzero if queued */
228 };
229
230 /* com device structure */
231 struct com_s {
232         u_char  state;          /* miscellaneous flag bits */
233         bool_t  active_out;     /* nonzero if the callout device is open */
234 #if 0
235         u_char  cfcr_image;     /* copy of value written to CFCR */
236 #endif
237         u_char  etc;            /* pending Embedded Transmit Command */
238         u_char  extra_state;    /* more flag bits, separate for order trick */
239 #if 0
240         u_char  fifo_image;     /* copy of value written to FIFO */
241 #endif
242         u_char  gfrcr_image;    /* copy of value read from GFRCR */
243 #if 0
244         bool_t  hasfifo;        /* nonzero for 16550 UARTs */
245         bool_t  loses_outints;  /* nonzero if device loses output interrupts */
246 #endif
247         u_char  mcr_dtr;        /* MCR bit that is wired to DTR */
248         u_char  mcr_image;      /* copy of value written to MCR */
249         u_char  mcr_rts;        /* MCR bit that is wired to RTS */
250 #if 0
251 #ifdef COM_MULTIPORT
252         bool_t  multiport;      /* is this unit part of a multiport device? */
253 #endif /* COM_MULTIPORT */
254         bool_t  no_irq;         /* nonzero if irq is not attached */
255         bool_t  poll;           /* nonzero if polling is required */
256         bool_t  poll_output;    /* nonzero if polling for output is required */
257 #endif
258         int     unit;           /* unit number */
259         int     dtr_wait;       /* time to hold DTR down on close (* 1/hz) */
260 #if 0
261         u_int   tx_fifo_size;
262 #endif
263         u_int   wopeners;       /* # processes waiting for DCD in open() */
264
265         /*
266          * The high level of the driver never reads status registers directly
267          * because there would be too many side effects to handle conveniently.
268          * Instead, it reads copies of the registers stored here by the
269          * interrupt handler.
270          */
271         u_char  last_modem_status;      /* last MSR read by intr handler */
272         u_char  prev_modem_status;      /* last MSR handled by high level */
273
274         u_char  hotchar;        /* ldisc-specific char to be handled ASAP */
275         u_char  *ibuf;          /* start of input buffer */
276         u_char  *ibufend;       /* end of input buffer */
277         u_char  *ibufold;       /* old input buffer, to be freed */
278         u_char  *ihighwater;    /* threshold in input buffer */
279         u_char  *iptr;          /* next free spot in input buffer */
280         int     ibufsize;       /* size of ibuf (not include error bytes) */
281         int     ierroff;        /* offset of error bytes in ibuf */
282
283         struct lbq      obufq;  /* head of queue of output buffers */
284         struct lbq      obufs[2];       /* output buffers */
285
286         int     cy_align;       /* index for register alignment */
287         cy_addr cy_iobase;      /* base address of this port's cyclom */
288         cy_addr iobase;         /* base address of this port's cd1400 */
289         int     mcr_rts_reg;    /* cd1400 reg number of reg holding mcr_rts */
290
291         struct tty      *tp;    /* cross reference */
292
293         /* Initial state. */
294         struct termios  it_in;  /* should be in struct tty */
295         struct termios  it_out;
296
297         /* Lock state. */
298         struct termios  lt_in;  /* should be in struct tty */
299         struct termios  lt_out;
300
301         bool_t  do_timestamp;
302         bool_t  do_dcd_timestamp;
303         struct timeval  timestamp;
304         struct timeval  dcd_timestamp;
305
306         u_long  bytes_in;       /* statistics */
307         u_long  bytes_out;
308         u_int   delta_error_counts[CE_NTYPES];
309         u_long  error_counts[CE_NTYPES];
310
311         u_int   recv_exception; /* exception chars received */
312         u_int   mdm;            /* modem signal changes */
313 #ifdef CyDebug
314         u_int   start_count;    /* no. of calls to comstart() */
315         u_int   start_real;     /* no. of calls that did something */
316 #endif
317         u_char  car;            /* CD1400 CAR shadow (if first unit in cd) */
318         u_char  channel_control;/* CD1400 CCR control command shadow */
319         u_char  cor[3];         /* CD1400 COR1-3 shadows */
320         u_char  intr_enable;    /* CD1400 SRER shadow */
321
322         /*
323          * Data area for output buffers.  Someday we should build the output
324          * buffer queue without copying data.
325          */
326         u_char  obuf1[256];
327         u_char  obuf2[256];
328 };
329
330 /* PCI driver entry point. */
331 int     cyattach_common         (cy_addr cy_iobase, int cy_align);
332 ointhand2_t     siointr;
333
334 static  int     cy_units        (cy_addr cy_iobase, int cy_align);
335 static  int     sioattach       (struct isa_device *dev);
336 static  void    cd1400_channel_cmd (struct com_s *com, int cmd);
337 static  void    cd1400_channel_cmd_wait (struct com_s *com);
338 static  void    cd_etc          (struct com_s *com, int etc);
339 static  int     cd_getreg       (struct com_s *com, int reg);
340 static  void    cd_setreg       (struct com_s *com, int reg, int val);
341 static  timeout_t siodtrwakeup;
342 static  void    comhardclose    (struct com_s *com);
343 static  void    sioinput        (struct com_s *com);
344 #if 0
345 static  void    siointr1        (struct com_s *com);
346 #endif
347 static  int     commctl         (struct com_s *com, int bits, int how);
348 static  int     comparam        (struct tty *tp, struct termios *t);
349 static  inthand2_t siopoll;
350 static  int     sioprobe        (struct isa_device *dev);
351 static  void    siosettimeout   (void);
352 static  int     siosetwater     (struct com_s *com, speed_t speed);
353 static  int     comspeed        (speed_t speed, u_long cy_clock,
354                                      int *prescaler_io);
355 static  void    comstart        (struct tty *tp);
356 static  void    comstop         (struct tty *tp, int rw);
357 static  timeout_t comwakeup;
358 static  void    disc_optim      (struct tty     *tp, struct termios *t,
359                                      struct com_s *com);
360
361 #ifdef CyDebug
362 void    cystatus        (int unit);
363 #endif
364
365 static char driver_name[] = "cy";
366
367 /* table and macro for fast conversion from a unit number to its com struct */
368 static  struct com_s    *p_com_addr[NSIO];
369 #define com_addr(unit)  (p_com_addr[unit])
370
371 struct isa_driver       siodriver = {
372         sioprobe, sioattach, driver_name
373 };
374
375 static  d_open_t        sioopen;
376 static  d_close_t       sioclose;
377 static  d_write_t       siowrite;
378 static  d_ioctl_t       sioioctl;
379
380 #define CDEV_MAJOR      48
381 static struct cdevsw sio_cdevsw = {
382         /* name */      driver_name,
383         /* maj */       CDEV_MAJOR,
384         /* flags */     D_TTY | D_KQFILTER,
385         /* port */      NULL,
386         /* clone */     NULL,
387
388         /* open */      sioopen,
389         /* close */     sioclose,
390         /* read */      ttyread,
391         /* write */     siowrite,
392         /* ioctl */     sioioctl,
393         /* poll */      ttypoll,
394         /* mmap */      nommap,
395         /* strategy */  nostrategy,
396         /* dump */      nodump,
397         /* psize */     nopsize,
398         /* kqfilter */  ttykqfilter
399 };
400
401 static  int     comconsole = -1;
402 static  speed_t comdefaultrate = TTYDEF_SPEED;
403 static  u_int   com_events;     /* input chars + weighted output completions */
404 static  bool_t  sio_registered;
405 static  int     sio_timeout;
406 static  int     sio_timeouts_until_log;
407 static  struct  callout_handle sio_timeout_handle
408     = CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle);
409 #if 0 /* XXX */
410 static struct tty       *sio_tty[NSIO];
411 #else
412 static struct tty       sio_tty[NSIO];
413 #endif
414 static  const int       nsio_tty = NSIO;
415
416 #ifdef CyDebug
417 static  u_int   cd_inbs;
418 static  u_int   cy_inbs;
419 static  u_int   cd_outbs;
420 static  u_int   cy_outbs;
421 static  u_int   cy_svrr_probes;
422 static  u_int   cy_timeouts;
423 #endif
424
425 static  int     cy_chip_offset[] = {
426         0x0000, 0x0400, 0x0800, 0x0c00, 0x0200, 0x0600, 0x0a00, 0x0e00,
427 };
428 static  int     cy_nr_cd1400s[NCY];
429 static  int     cy_total_devices;
430 #undef  RxFifoThreshold
431 static  int     volatile RxFifoThreshold = (CD1400_RX_FIFO_SIZE / 2);
432
433 static int
434 sioprobe(dev)
435         struct isa_device       *dev;
436 {
437         cy_addr iobase;
438
439         iobase = (cy_addr)dev->id_maddr;
440
441         /* Cyclom-16Y hardware reset (Cyclom-8Ys don't care) */
442         cy_inb(iobase, CY16_RESET, 0);  /* XXX? */
443         DELAY(500);     /* wait for the board to get its act together */
444
445         /* this is needed to get the board out of reset */
446         cy_outb(iobase, CY_CLEAR_INTR, 0, 0);
447         DELAY(500);
448
449         return (cy_units(iobase, 0) == 0 ? 0 : -1);
450 }
451
452 static int
453 cy_units(cy_iobase, cy_align)
454         cy_addr cy_iobase;
455         int     cy_align;
456 {
457         int     cyu;
458         u_char  firmware_version = 0;  /* assign to avoid warning */
459         int     i;
460         cy_addr iobase;
461
462         for (cyu = 0; cyu < CY_MAX_CD1400s; ++cyu) {
463                 iobase = cy_iobase + (cy_chip_offset[cyu] << cy_align);
464
465                 /* wait for chip to become ready for new command */
466                 for (i = 0; i < 10; i++) {
467                         DELAY(50);
468                         if (!cd_inb(iobase, CD1400_CCR, cy_align))
469                                 break;
470                 }
471
472                 /* clear the GFRCR register */
473                 cd_outb(iobase, CD1400_GFRCR, cy_align, 0);
474
475                 /* issue a reset command */
476                 cd_outb(iobase, CD1400_CCR, cy_align,
477                         CD1400_CCR_CMDRESET | CD1400_CCR_FULLRESET);
478
479                 /* wait for the CD1400 to initialize itself */
480                 for (i = 0; i < 200; i++) {
481                         DELAY(50);
482
483                         /* retrieve firmware version */
484                         firmware_version = cd_inb(iobase, CD1400_GFRCR,
485                                                   cy_align);
486                         if ((firmware_version & 0xf0) == 0x40)
487                                 break;
488                 }
489
490                 /*
491                  * Anything in the 0x40-0x4F range is fine.
492                  * If one CD1400 is bad then we don't support higher
493                  * numbered good ones on this board.
494                  */
495                 if ((firmware_version & 0xf0) != 0x40)
496                         break;
497         }
498         return (cyu);
499 }
500
501 static int
502 sioattach(isdp)
503         struct isa_device       *isdp;
504 {
505         int     adapter;
506
507         adapter = cyattach_common((cy_addr) isdp->id_maddr, 0);
508         if (adapter < 0)
509                 return (0);
510
511         /*
512          * XXX
513          * This kludge is to allow ISA/PCI device specifications in the
514          * kernel config file to be in any order.
515          */
516         if (isdp->id_unit != adapter) {
517                 printf("cy%d: attached as cy%d\n", isdp->id_unit, adapter);
518                 isdp->id_unit = adapter;        /* XXX */
519         }
520         isdp->id_ointr = siointr;
521         /* isdp->id_ri_flags |= RI_FAST; XXX unimplemented - use newbus! */
522         return (1);
523 }
524
525 int
526 cyattach_common(cy_iobase, cy_align)
527         cy_addr cy_iobase;
528         int     cy_align;
529 {
530         int     adapter;
531         int     cyu;
532         u_char  firmware_version;
533         cy_addr iobase;
534         int     minorbase;
535         int     ncyu;
536         int     unit;
537
538         adapter = cy_total_devices;
539         if ((u_int)adapter >= NCY) {
540                 printf(
541         "cy%d: can't attach adapter: insufficient cy devices configured\n",
542                        adapter);
543                 return (-1);
544         }
545         ncyu = cy_units(cy_iobase, cy_align);
546         if (ncyu == 0)
547                 return (-1);
548         cy_nr_cd1400s[adapter] = ncyu;
549         cy_total_devices++;
550
551         unit = adapter * CY_MAX_PORTS;
552         for (cyu = 0; cyu < ncyu; ++cyu) {
553                 int     cdu;
554
555                 iobase = (cy_addr) (cy_iobase
556                                     + (cy_chip_offset[cyu] << cy_align));
557                 firmware_version = cd_inb(iobase, CD1400_GFRCR, cy_align);
558
559                 /* Set up a receive timeout period of than 1+ ms. */
560                 cd_outb(iobase, CD1400_PPR, cy_align,
561                         howmany(CY_CLOCK(firmware_version)
562                                 / CD1400_PPR_PRESCALER, 1000));
563
564                 for (cdu = 0; cdu < CD1400_NO_OF_CHANNELS; ++cdu, ++unit) {
565                         struct com_s    *com;
566                         int             s;
567
568         com = malloc(sizeof *com, M_DEVBUF, M_NOWAIT);
569         if (com == NULL)
570                 break;
571         bzero(com, sizeof *com);
572         com->unit = unit;
573                         com->gfrcr_image = firmware_version;
574                         if (CY_RTS_DTR_SWAPPED(firmware_version)) {
575                                 com->mcr_dtr = MCR_RTS;
576                                 com->mcr_rts = MCR_DTR;
577                                 com->mcr_rts_reg = CD1400_MSVR2;
578                         } else {
579                                 com->mcr_dtr = MCR_DTR;
580                                 com->mcr_rts = MCR_RTS;
581                                 com->mcr_rts_reg = CD1400_MSVR1;
582                         }
583         com->dtr_wait = 3 * hz;
584         com->obufs[0].l_head = com->obuf1;
585         com->obufs[1].l_head = com->obuf2;
586
587                         com->cy_align = cy_align;
588                         com->cy_iobase = cy_iobase;
589         com->iobase = iobase;
590                         com->car = ~CD1400_CAR_CHAN;
591
592         /*
593          * We don't use all the flags from <sys/ttydefaults.h> since they
594          * are only relevant for logins.  It's important to have echo off
595          * initially so that the line doesn't start blathering before the
596          * echo flag can be turned off.
597          */
598         com->it_in.c_iflag = 0;
599         com->it_in.c_oflag = 0;
600         com->it_in.c_cflag = TTYDEF_CFLAG;
601         com->it_in.c_lflag = 0;
602         if (unit == comconsole) {
603                 com->it_in.c_iflag = TTYDEF_IFLAG;
604                 com->it_in.c_oflag = TTYDEF_OFLAG;
605                 com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
606                 com->it_in.c_lflag = TTYDEF_LFLAG;
607                 com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL;
608         }
609         if (siosetwater(com, com->it_in.c_ispeed) != 0) {
610                 enable_intr();
611                 free(com, M_DEVBUF);
612                 return (0);
613         }
614         enable_intr();
615         termioschars(&com->it_in);
616         com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
617         com->it_out = com->it_in;
618
619         s = spltty();
620         com_addr(unit) = com;
621         splx(s);
622
623         if (!sio_registered) {
624                 cdevsw_add(&sio_cdevsw);
625                 register_swi(SWI_TTY, siopoll, NULL, "cy");
626                 sio_registered = TRUE;
627         }
628         minorbase = UNIT_TO_MINOR(unit);
629         make_dev(&sio_cdevsw, minorbase,
630                 UID_ROOT, GID_WHEEL, 0600, "ttyc%r%r", adapter,
631                 unit % CY_MAX_PORTS);
632         make_dev(&sio_cdevsw, minorbase | CONTROL_INIT_STATE,
633                 UID_ROOT, GID_WHEEL, 0600, "ttyic%r%r", adapter,
634                 unit % CY_MAX_PORTS);
635         make_dev(&sio_cdevsw, minorbase | CONTROL_LOCK_STATE,
636                 UID_ROOT, GID_WHEEL, 0600, "ttylc%r%r", adapter,
637                 unit % CY_MAX_PORTS);
638         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK,
639                 UID_UUCP, GID_DIALER, 0660, "cuac%r%r", adapter,
640                 unit % CY_MAX_PORTS);
641         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_INIT_STATE,
642                 UID_UUCP, GID_DIALER, 0660, "cuaic%r%r", adapter,
643                 unit % CY_MAX_PORTS);
644         make_dev(&sio_cdevsw, minorbase | CALLOUT_MASK | CONTROL_LOCK_STATE,
645                 UID_UUCP, GID_DIALER, 0660, "cualc%r%r", adapter,
646                 unit % CY_MAX_PORTS);
647                 }
648         }
649
650         /* ensure an edge for the next interrupt */
651         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
652
653         return (adapter);
654 }
655
656 static int
657 sioopen(dev_t dev, int flag, int mode, struct thread *td)
658 {
659         struct com_s    *com;
660         int             error;
661         int             mynor;
662         int             s;
663         struct tty      *tp;
664         int             unit;
665
666         mynor = minor(dev);
667         unit = MINOR_TO_UNIT(mynor);
668         if ((u_int) unit >= NSIO || (com = com_addr(unit)) == NULL)
669                 return (ENXIO);
670         if (mynor & CONTROL_MASK)
671                 return (0);
672 #if 0 /* XXX */
673         tp = com->tp = sio_tty[unit] = ttymalloc(sio_tty[unit]);
674 #else
675         tp = com->tp = &sio_tty[unit];
676 #endif
677         dev->si_tty = tp;
678         s = spltty();
679         /*
680          * We jump to this label after all non-interrupted sleeps to pick
681          * up any changes of the device state.
682          */
683 open_top:
684         while (com->state & CS_DTR_OFF) {
685                 error = tsleep(&com->dtr_wait, PCATCH, "cydtr", 0);
686                 if (error != 0)
687                         goto out;
688         }
689         if (tp->t_state & TS_ISOPEN) {
690                 /*
691                  * The device is open, so everything has been initialized.
692                  * Handle conflicts.
693                  */
694                 if (mynor & CALLOUT_MASK) {
695                         if (!com->active_out) {
696                                 error = EBUSY;
697                                 goto out;
698                         }
699                 } else {
700                         if (com->active_out) {
701                                 if (flag & O_NONBLOCK) {
702                                         error = EBUSY;
703                                         goto out;
704                                 }
705                                 error = tsleep(&com->active_out,
706                                                PCATCH, "cybi", 0);
707                                 if (error != 0)
708                                         goto out;
709                                 goto open_top;
710                         }
711                 }
712                 if (tp->t_state & TS_XCLUDE &&
713                     suser(td)) {
714                         error = EBUSY;
715                         goto out;
716                 }
717         } else {
718                 /*
719                  * The device isn't open, so there are no conflicts.
720                  * Initialize it.  Initialization is done twice in many
721                  * cases: to preempt sleeping callin opens if we are
722                  * callout, and to complete a callin open after DCD rises.
723                  */
724                 tp->t_oproc = comstart;
725                 tp->t_stop = comstop;
726                 tp->t_param = comparam;
727                 tp->t_dev = dev;
728                 tp->t_termios = mynor & CALLOUT_MASK
729                                 ? com->it_out : com->it_in;
730
731                 /* Encode per-board unit in LIVR for access in intr routines. */
732                 cd_setreg(com, CD1400_LIVR,
733                           (unit & CD1400_xIVR_CHAN) << CD1400_xIVR_CHAN_SHIFT);
734
735                 (void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET);
736 #if 0
737                 com->poll = com->no_irq;
738                 com->poll_output = com->loses_outints;
739 #endif
740                 ++com->wopeners;
741                 error = comparam(tp, &tp->t_termios);
742                 --com->wopeners;
743                 if (error != 0)
744                         goto out;
745 #if 0
746                 if (com->hasfifo) {
747                         /*
748                          * (Re)enable and flush fifos.
749                          *
750                          * Certain SMC chips cause problems if the fifos
751                          * are enabled while input is ready.  Turn off the
752                          * fifo if necessary to clear the input.  We test
753                          * the input ready bit after enabling the fifos
754                          * since we've already enabled them in comparam()
755                          * and to handle races between enabling and fresh
756                          * input.
757                          */
758                         while (TRUE) {
759                                 outb(iobase + com_fifo,
760                                      FIFO_RCV_RST | FIFO_XMT_RST
761                                      | com->fifo_image);
762                                 DELAY(100);
763                                 if (!(inb(com->line_status_port) & LSR_RXRDY))
764                                         break;
765                                 outb(iobase + com_fifo, 0);
766                                 DELAY(100);
767                                 (void) inb(com->data_port);
768                         }
769                 }
770
771                 disable_intr();
772                 (void) inb(com->line_status_port);
773                 (void) inb(com->data_port);
774                 com->prev_modem_status = com->last_modem_status
775                     = inb(com->modem_status_port);
776                 outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS
777                                        | IER_EMSC);
778                 enable_intr();
779 #else /* !0 */
780                 /*
781                  * Flush fifos.  This requires a full channel reset which
782                  * also disables the transmitter and receiver.  Recover
783                  * from this.
784                  */
785                 cd1400_channel_cmd(com,
786                                    CD1400_CCR_CMDRESET | CD1400_CCR_CHANRESET);
787                 cd1400_channel_cmd(com, com->channel_control);
788
789                 disable_intr();
790                 com->prev_modem_status = com->last_modem_status
791                     = cd_getreg(com, CD1400_MSVR2);
792                 cd_setreg(com, CD1400_SRER,
793                           com->intr_enable
794                           = CD1400_SRER_MDMCH | CD1400_SRER_RXDATA);
795                 enable_intr();
796 #endif /* 0 */
797                 /*
798                  * Handle initial DCD.  Callout devices get a fake initial
799                  * DCD (trapdoor DCD).  If we are callout, then any sleeping
800                  * callin opens get woken up and resume sleeping on "cybi"
801                  * instead of "cydcd".
802                  */
803                 /*
804                  * XXX `mynor & CALLOUT_MASK' should be
805                  * `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
806                  * TRAPDOOR_CARRIER is the default initial state for callout
807                  * devices and SOFT_CARRIER is like CLOCAL except it hides
808                  * the true carrier.
809                  */
810                 if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK)
811                         (*linesw[tp->t_line].l_modem)(tp, 1);
812         }
813         /*
814          * Wait for DCD if necessary.
815          */
816         if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK)
817             && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) {
818                 ++com->wopeners;
819                 error = tsleep(TSA_CARR_ON(tp), PCATCH, "cydcd", 0);
820                 --com->wopeners;
821                 if (error != 0)
822                         goto out;
823                 goto open_top;
824         }
825         error = (*linesw[tp->t_line].l_open)(dev, tp);
826         disc_optim(tp, &tp->t_termios, com);
827         if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
828                 com->active_out = TRUE;
829         siosettimeout();
830 out:
831         splx(s);
832         if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
833                 comhardclose(com);
834         return (error);
835 }
836
837 static int
838 sioclose(dev_t dev, int flag, int mode, struct thread *td)
839 {
840         struct com_s    *com;
841         int             mynor;
842         int             s;
843         struct tty      *tp;
844
845         mynor = minor(dev);
846         if (mynor & CONTROL_MASK)
847                 return (0);
848         com = com_addr(MINOR_TO_UNIT(mynor));
849         tp = com->tp;
850         s = spltty();
851         cd_etc(com, CD1400_ETC_STOPBREAK);
852         (*linesw[tp->t_line].l_close)(tp, flag);
853         disc_optim(tp, &tp->t_termios, com);
854         comstop(tp, FREAD | FWRITE);
855         comhardclose(com);
856         ttyclose(tp);
857         siosettimeout();
858         splx(s);
859 #ifdef broken /* session holds a ref to the tty; can't deallocate */
860         ttyfree(tp);
861         com->tp = sio_tty[unit] = NULL;
862 #endif
863         return (0);
864 }
865
866 static void
867 comhardclose(com)
868         struct com_s    *com;
869 {
870         cy_addr         iobase;
871         int             s;
872         struct tty      *tp;
873         int             unit;
874
875         unit = com->unit;
876         iobase = com->iobase;
877         s = spltty();
878 #if 0
879         com->poll = FALSE;
880         com->poll_output = FALSE;
881 #endif
882         com->do_timestamp = 0;
883 #if 0
884         outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
885 #else
886         /* XXX */
887         disable_intr();
888         com->etc = ETC_NONE;
889         cd_setreg(com, CD1400_COR2, com->cor[1] &= ~CD1400_COR2_ETC);
890         enable_intr();
891         cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
892 #endif
893
894         {
895 #if 0
896                 outb(iobase + com_ier, 0);
897 #else
898                 disable_intr();
899                 cd_setreg(com, CD1400_SRER, com->intr_enable = 0);
900                 enable_intr();
901 #endif
902                 tp = com->tp;
903                 if ((tp->t_cflag & HUPCL)
904                     /*
905                      * XXX we will miss any carrier drop between here and the
906                      * next open.  Perhaps we should watch DCD even when the
907                      * port is closed; it is not sufficient to check it at
908                      * the next open because it might go up and down while
909                      * we're not watching.
910                      */
911                     || (!com->active_out
912                        && !(com->prev_modem_status & MSR_DCD)
913                        && !(com->it_in.c_cflag & CLOCAL))
914                     || !(tp->t_state & TS_ISOPEN)) {
915                         (void)commctl(com, TIOCM_DTR, DMBIC);
916
917                         /* Disable receiver (leave transmitter enabled). */
918                         com->channel_control = CD1400_CCR_CMDCHANCTL
919                                                | CD1400_CCR_XMTEN
920                                                | CD1400_CCR_RCVDIS;
921                         cd1400_channel_cmd(com, com->channel_control);
922
923                         if (com->dtr_wait != 0 && !(com->state & CS_DTR_OFF)) {
924                                 timeout(siodtrwakeup, com, com->dtr_wait);
925                                 com->state |= CS_DTR_OFF;
926                         }
927                 }
928         }
929 #if 0
930         if (com->hasfifo) {
931                 /*
932                  * Disable fifos so that they are off after controlled
933                  * reboots.  Some BIOSes fail to detect 16550s when the
934                  * fifos are enabled.
935                  */
936                 outb(iobase + com_fifo, 0);
937         }
938 #endif
939         com->active_out = FALSE;
940         wakeup(&com->active_out);
941         wakeup(TSA_CARR_ON(tp));        /* restart any wopeners */
942         splx(s);
943 }
944
945 static int
946 siowrite(dev, uio, flag)
947         dev_t           dev;
948         struct uio      *uio;
949         int             flag;
950 {
951         int             mynor;
952         struct tty      *tp;
953         int             unit;
954
955         mynor = minor(dev);
956         if (mynor & CONTROL_MASK)
957                 return (ENODEV);
958
959         unit = MINOR_TO_UNIT(mynor);
960         tp = com_addr(unit)->tp;
961         /*
962          * (XXX) We disallow virtual consoles if the physical console is
963          * a serial port.  This is in case there is a display attached that
964          * is not the console.  In that situation we don't need/want the X
965          * server taking over the console.
966          */
967         if (constty != NULL && unit == comconsole)
968                 constty = NULL;
969 #ifdef Smarts
970         /* XXX duplicate ttwrite(), but without so much output processing on
971          * CR & LF chars.  Hardly worth the effort, given that high-throughput
972          * sessions are raw anyhow.
973          */
974 #else
975         return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
976 #endif
977 }
978
979 static void
980 siodtrwakeup(chan)
981         void    *chan;
982 {
983         struct com_s    *com;
984
985         com = (struct com_s *)chan;
986         com->state &= ~CS_DTR_OFF;
987         wakeup(&com->dtr_wait);
988 }
989
990 static void
991 sioinput(com)
992         struct com_s    *com;
993 {
994         u_char          *buf;
995         int             incc;
996         u_char          line_status;
997         int             recv_data;
998         struct tty      *tp;
999
1000         buf = com->ibuf;
1001         tp = com->tp;
1002         if (!(tp->t_state & TS_ISOPEN)) {
1003                 com_events -= (com->iptr - com->ibuf);
1004                 com->iptr = com->ibuf;
1005                 return;
1006         }
1007         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1008                 /*
1009                  * Avoid the grotesquely inefficient lineswitch routine
1010                  * (ttyinput) in "raw" mode.  It usually takes about 450
1011                  * instructions (that's without canonical processing or echo!).
1012                  * slinput is reasonably fast (usually 40 instructions plus
1013                  * call overhead).
1014                  */
1015                 do {
1016                         enable_intr();
1017                         incc = com->iptr - buf;
1018                         if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
1019                             && (com->state & CS_RTS_IFLOW
1020                                 || tp->t_iflag & IXOFF)
1021                             && !(tp->t_state & TS_TBLOCK))
1022                                 ttyblock(tp);
1023                         com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
1024                                 += b_to_q((char *)buf, incc, &tp->t_rawq);
1025                         buf += incc;
1026                         tk_nin += incc;
1027                         tk_rawcc += incc;
1028                         tp->t_rawcc += incc;
1029                         ttwakeup(tp);
1030                         if (tp->t_state & TS_TTSTOP
1031                             && (tp->t_iflag & IXANY
1032                                 || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1033                                 tp->t_state &= ~TS_TTSTOP;
1034                                 tp->t_lflag &= ~FLUSHO;
1035                                 comstart(tp);
1036                         }
1037                         disable_intr();
1038                 } while (buf < com->iptr);
1039         } else {
1040                 do {
1041                         enable_intr();
1042                         line_status = buf[com->ierroff];
1043                         recv_data = *buf++;
1044                         if (line_status
1045                             & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
1046                                 if (line_status & LSR_BI)
1047                                         recv_data |= TTY_BI;
1048                                 if (line_status & LSR_FE)
1049                                         recv_data |= TTY_FE;
1050                                 if (line_status & LSR_OE)
1051                                         recv_data |= TTY_OE;
1052                                 if (line_status & LSR_PE)
1053                                         recv_data |= TTY_PE;
1054                         }
1055                         (*linesw[tp->t_line].l_rint)(recv_data, tp);
1056                         disable_intr();
1057                 } while (buf < com->iptr);
1058         }
1059         com_events -= (com->iptr - com->ibuf);
1060         com->iptr = com->ibuf;
1061
1062         /*
1063          * There is now room for another low-level buffer full of input,
1064          * so enable RTS if it is now disabled and there is room in the
1065          * high-level buffer.
1066          */
1067         if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & com->mcr_rts) &&
1068             !(tp->t_state & TS_TBLOCK))
1069 #if 0
1070                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
1071 #else
1072                 cd_setreg(com, com->mcr_rts_reg,
1073                           com->mcr_image |= com->mcr_rts);
1074 #endif
1075 }
1076
1077 void
1078 siointr(unit)
1079         int     unit;
1080 {
1081         int     baseu;
1082         int     cy_align;
1083         cy_addr cy_iobase;
1084         int     cyu;
1085         cy_addr iobase;
1086         u_char  status;
1087
1088         com_lock();     /* XXX could this be placed down lower in the loop? */
1089
1090         baseu = unit * CY_MAX_PORTS;
1091         cy_align = com_addr(baseu)->cy_align;
1092         cy_iobase = com_addr(baseu)->cy_iobase;
1093
1094         /* check each CD1400 in turn */
1095         for (cyu = 0; cyu < cy_nr_cd1400s[unit]; ++cyu) {
1096                 iobase = (cy_addr) (cy_iobase
1097                                     + (cy_chip_offset[cyu] << cy_align));
1098                 /* poll to see if it has any work */
1099                 status = cd_inb(iobase, CD1400_SVRR, cy_align);
1100                 if (status == 0)
1101                         continue;
1102 #ifdef CyDebug
1103                 ++cy_svrr_probes;
1104 #endif
1105                 /* service requests as appropriate, giving priority to RX */
1106                 if (status & CD1400_SVRR_RXRDY) {
1107                         struct com_s    *com;
1108                         u_int           count;
1109                         u_char          *ioptr;
1110                         u_char          line_status;
1111                         u_char          recv_data;
1112                         u_char          serv_type;
1113 #ifdef PollMode
1114                         u_char          save_rir;
1115 #endif
1116
1117 #ifdef PollMode
1118                         save_rir = cd_inb(iobase, CD1400_RIR, cy_align);
1119
1120                         /* enter rx service */
1121                         cd_outb(iobase, CD1400_CAR, cy_align, save_rir);
1122                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
1123                         = save_rir & CD1400_CAR_CHAN;
1124
1125                         serv_type = cd_inb(iobase, CD1400_RIVR, cy_align);
1126                         com = com_addr(baseu
1127                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
1128                                           & CD1400_xIVR_CHAN));
1129 #else
1130                         /* ack receive service */
1131                         serv_type = cy_inb(iobase, CY8_SVCACKR, cy_align);
1132
1133                         com = com_addr(baseu +
1134                                        + ((serv_type >> CD1400_xIVR_CHAN_SHIFT)
1135                                           & CD1400_xIVR_CHAN));
1136 #endif
1137
1138                 if (serv_type & CD1400_RIVR_EXCEPTION) {
1139                         ++com->recv_exception;
1140                         line_status = cd_inb(iobase, CD1400_RDSR, cy_align);
1141                         /* break/unnattached error bits or real input? */
1142                         recv_data = cd_inb(iobase, CD1400_RDSR, cy_align);
1143 #ifndef SOFT_HOTCHAR
1144                         if (line_status & CD1400_RDSR_SPECIAL
1145                             && com->hotchar != 0)
1146                                 setsofttty();
1147 #endif
1148 #if 1 /* XXX "intelligent" PFO error handling would break O error handling */
1149                         if (line_status & (LSR_PE|LSR_FE|LSR_BI)) {
1150                                 /*
1151                                   Don't store PE if IGNPAR and BI if IGNBRK,
1152                                   this hack allows "raw" tty optimization
1153                                   works even if IGN* is set.
1154                                 */
1155                                 if (   com->tp == NULL
1156                                     || !(com->tp->t_state & TS_ISOPEN)
1157                                     || ((line_status & (LSR_PE|LSR_FE))
1158                                     &&  (com->tp->t_iflag & IGNPAR))
1159                                     || ((line_status & LSR_BI)
1160                                     &&  (com->tp->t_iflag & IGNBRK)))
1161                                         goto cont;
1162                                 if (   (line_status & (LSR_PE|LSR_FE))
1163                                     && (com->tp->t_state & TS_CAN_BYPASS_L_RINT)
1164                                     && ((line_status & LSR_FE)
1165                                     ||  ((line_status & LSR_PE)
1166                                     &&  (com->tp->t_iflag & INPCK))))
1167                                         recv_data = 0;
1168                         }
1169 #endif /* 1 */
1170                         ++com->bytes_in;
1171 #ifdef SOFT_HOTCHAR
1172                         if (com->hotchar != 0 && recv_data == com->hotchar)
1173                                 setsofttty();
1174 #endif
1175                         ioptr = com->iptr;
1176                         if (ioptr >= com->ibufend)
1177                                 CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
1178                         else {
1179                                 if (com->do_timestamp)
1180                                         microtime(&com->timestamp);
1181                                 ++com_events;
1182                                 ioptr[0] = recv_data;
1183                                 ioptr[com->ierroff] = line_status;
1184                                 com->iptr = ++ioptr;
1185                                 if (ioptr == com->ihighwater
1186                                     && com->state & CS_RTS_IFLOW)
1187 #if 0
1188                                         outb(com->modem_ctl_port,
1189                                              com->mcr_image &= ~MCR_RTS);
1190 #else
1191                                         cd_outb(iobase, com->mcr_rts_reg,
1192                                                 cy_align,
1193                                                 com->mcr_image &=
1194                                                 ~com->mcr_rts);
1195 #endif
1196                                 if (line_status & LSR_OE)
1197                                         CE_RECORD(com, CE_OVERRUN);
1198                         }
1199                         goto cont;
1200                 } else {
1201                         int     ifree;
1202
1203                         count = cd_inb(iobase, CD1400_RDCR, cy_align);
1204                         if (!count)
1205                                 goto cont;
1206                         com->bytes_in += count;
1207                         ioptr = com->iptr;
1208                         ifree = com->ibufend - ioptr;
1209                         if (count > ifree) {
1210                                 count -= ifree;
1211                                 com_events += ifree;
1212                                 if (ifree != 0) {
1213                                         if (com->do_timestamp)
1214                                                 microtime(&com->timestamp);
1215                                         do {
1216                                                 recv_data = cd_inb(iobase,
1217                                                                    CD1400_RDSR,
1218                                                                    cy_align);
1219 #ifdef SOFT_HOTCHAR
1220                                                 if (com->hotchar != 0
1221                                                     && recv_data
1222                                                        == com->hotchar)
1223                                                         setsofttty();
1224 #endif
1225                                                 ioptr[0] = recv_data;
1226                                                 ioptr[com->ierroff] = 0;
1227                                                 ++ioptr;
1228                                         } while (--ifree != 0);
1229                                 }
1230                                 com->delta_error_counts
1231                                     [CE_INTERRUPT_BUF_OVERFLOW] += count;
1232                                 do {
1233                                         recv_data = cd_inb(iobase, CD1400_RDSR,
1234                                                            cy_align);
1235 #ifdef SOFT_HOTCHAR
1236                                         if (com->hotchar != 0
1237                                             && recv_data == com->hotchar)
1238                                                 setsofttty();
1239 #endif
1240                                 } while (--count != 0);
1241                         } else {
1242                                 if (com->do_timestamp)
1243                                         microtime(&com->timestamp);
1244                                 if (ioptr <= com->ihighwater
1245                                     && ioptr + count > com->ihighwater
1246                                     && com->state & CS_RTS_IFLOW)
1247 #if 0
1248                                         outb(com->modem_ctl_port,
1249                                              com->mcr_image &= ~MCR_RTS);
1250 #else
1251                                         cd_outb(iobase, com->mcr_rts_reg,
1252                                                 cy_align,
1253                                                 com->mcr_image
1254                                                 &= ~com->mcr_rts);
1255 #endif
1256                                 com_events += count;
1257                                 do {
1258                                         recv_data = cd_inb(iobase, CD1400_RDSR,
1259                                                            cy_align);
1260 #ifdef SOFT_HOTCHAR
1261                                         if (com->hotchar != 0
1262                                             && recv_data == com->hotchar)
1263                                                 setsofttty();
1264 #endif
1265                                         ioptr[0] = recv_data;
1266                                         ioptr[com->ierroff] = 0;
1267                                         ++ioptr;
1268                                 } while (--count != 0);
1269                         }
1270                         com->iptr = ioptr;
1271                 }
1272 cont:
1273
1274                         /* terminate service context */
1275 #ifdef PollMode
1276                         cd_outb(iobase, CD1400_RIR, cy_align,
1277                                 save_rir
1278                                 & ~(CD1400_RIR_RDIREQ | CD1400_RIR_RBUSY));
1279 #else
1280                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
1281 #endif
1282                 }
1283                 if (status & CD1400_SVRR_MDMCH) {
1284                         struct com_s    *com;
1285                         u_char  modem_status;
1286 #ifdef PollMode
1287                         u_char  save_mir;
1288 #else
1289                         u_char  vector;
1290 #endif
1291
1292 #ifdef PollMode
1293                         save_mir = cd_inb(iobase, CD1400_MIR, cy_align);
1294
1295                         /* enter modem service */
1296                         cd_outb(iobase, CD1400_CAR, cy_align, save_mir);
1297                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
1298                         = save_mir & CD1400_CAR_CHAN;
1299
1300                         com = com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS
1301                                        + (save_mir & CD1400_MIR_CHAN));
1302 #else
1303                         /* ack modem service */
1304                         vector = cy_inb(iobase, CY8_SVCACKM, cy_align);
1305
1306                         com = com_addr(baseu
1307                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
1308                                           & CD1400_xIVR_CHAN));
1309 #endif
1310                         ++com->mdm;
1311                         modem_status = cd_inb(iobase, CD1400_MSVR2, cy_align);
1312                 if (modem_status != com->last_modem_status) {
1313                         if (com->do_dcd_timestamp
1314                             && !(com->last_modem_status & MSR_DCD)
1315                             && modem_status & MSR_DCD)
1316                                 microtime(&com->dcd_timestamp);
1317
1318                         /*
1319                          * Schedule high level to handle DCD changes.  Note
1320                          * that we don't use the delta bits anywhere.  Some
1321                          * UARTs mess them up, and it's easy to remember the
1322                          * previous bits and calculate the delta.
1323                          */
1324                         com->last_modem_status = modem_status;
1325                         if (!(com->state & CS_CHECKMSR)) {
1326                                 com_events += LOTS_OF_EVENTS;
1327                                 com->state |= CS_CHECKMSR;
1328                                 setsofttty();
1329                         }
1330
1331 #ifdef SOFT_CTS_OFLOW
1332                         /* handle CTS change immediately for crisp flow ctl */
1333                         if (com->state & CS_CTS_OFLOW) {
1334                                 if (modem_status & MSR_CTS) {
1335                                         com->state |= CS_ODEVREADY;
1336                                         if (com->state >= (CS_BUSY | CS_TTGO
1337                                                            | CS_ODEVREADY)
1338                                             && !(com->intr_enable
1339                                                  & CD1400_SRER_TXRDY))
1340                                                 cd_outb(iobase, CD1400_SRER,
1341                                                         cy_align,
1342                                                         com->intr_enable
1343                                                         = com->intr_enable
1344                                                           & ~CD1400_SRER_TXMPTY
1345                                                           | CD1400_SRER_TXRDY);
1346                                 } else {
1347                                         com->state &= ~CS_ODEVREADY;
1348                                         if (com->intr_enable
1349                                             & CD1400_SRER_TXRDY)
1350                                                 cd_outb(iobase, CD1400_SRER,
1351                                                         cy_align,
1352                                                         com->intr_enable
1353                                                         = com->intr_enable
1354                                                           & ~CD1400_SRER_TXRDY
1355                                                           | CD1400_SRER_TXMPTY);
1356                                 }
1357                         }
1358 #endif
1359                 }
1360
1361                         /* terminate service context */
1362 #ifdef PollMode
1363                         cd_outb(iobase, CD1400_MIR, cy_align,
1364                                 save_mir
1365                                 & ~(CD1400_MIR_RDIREQ | CD1400_MIR_RBUSY));
1366 #else
1367                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
1368 #endif
1369                 }
1370                 if (status & CD1400_SVRR_TXRDY) {
1371                         struct com_s    *com;
1372 #ifdef PollMode
1373                         u_char  save_tir;
1374 #else
1375                         u_char  vector;
1376 #endif
1377
1378 #ifdef PollMode
1379                         save_tir = cd_inb(iobase, CD1400_TIR, cy_align);
1380
1381                         /* enter tx service */
1382                         cd_outb(iobase, CD1400_CAR, cy_align, save_tir);
1383                         com_addr(baseu + cyu * CD1400_NO_OF_CHANNELS)->car
1384                         = save_tir & CD1400_CAR_CHAN;
1385
1386                         com = com_addr(baseu
1387                                        + cyu * CD1400_NO_OF_CHANNELS
1388                                        + (save_tir & CD1400_TIR_CHAN));
1389 #else
1390                         /* ack transmit service */
1391                         vector = cy_inb(iobase, CY8_SVCACKT, cy_align);
1392
1393                         com = com_addr(baseu
1394                                        + ((vector >> CD1400_xIVR_CHAN_SHIFT)
1395                                           & CD1400_xIVR_CHAN));
1396 #endif
1397
1398                         if (com->etc != ETC_NONE) {
1399                                 if (com->intr_enable & CD1400_SRER_TXRDY) {
1400                                         /*
1401                                          * Here due to sloppy SRER_TXRDY
1402                                          * enabling.  Ignore.  Come back when
1403                                          * tx is empty.
1404                                          */
1405                                         cd_outb(iobase, CD1400_SRER, cy_align,
1406                                                 com->intr_enable
1407                                                 = (com->intr_enable
1408                                                   & ~CD1400_SRER_TXRDY)
1409                                                   | CD1400_SRER_TXMPTY);
1410                                         goto terminate_tx_service;
1411                                 }
1412                                 switch (com->etc) {
1413                                 case CD1400_ETC_SENDBREAK:
1414                                 case CD1400_ETC_STOPBREAK:
1415                                         /*
1416                                          * Start the command.  Come back on
1417                                          * next tx empty interrupt, hopefully
1418                                          * after command has been executed.
1419                                          */
1420                                         cd_outb(iobase, CD1400_COR2, cy_align,
1421                                                 com->cor[1] |= CD1400_COR2_ETC);
1422                                         cd_outb(iobase, CD1400_TDR, cy_align,
1423                                                 CD1400_ETC_CMD);
1424                                         cd_outb(iobase, CD1400_TDR, cy_align,
1425                                                 com->etc);
1426                                         if (com->etc == CD1400_ETC_SENDBREAK)
1427                                                 com->etc = ETC_BREAK_STARTING;
1428                                         else
1429                                                 com->etc = ETC_BREAK_ENDING;
1430                                         goto terminate_tx_service;
1431                                 case ETC_BREAK_STARTING:
1432                                         /*
1433                                          * BREAK is now on.  Continue with
1434                                          * SRER_TXMPTY processing, hopefully
1435                                          * don't come back.
1436                                          */
1437                                         com->etc = ETC_BREAK_STARTED;
1438                                         break;
1439                                 case ETC_BREAK_STARTED:
1440                                         /*
1441                                          * Came back due to sloppy SRER_TXMPTY
1442                                          * enabling.  Hope again.
1443                                          */
1444                                         break;
1445                                 case ETC_BREAK_ENDING:
1446                                         /*
1447                                          * BREAK is now off.  Continue with
1448                                          * SRER_TXMPTY processing and don't
1449                                          * come back.  The SWI handler will
1450                                          * restart tx interrupts if necessary.
1451                                          */
1452                                         cd_outb(iobase, CD1400_COR2, cy_align,
1453                                                 com->cor[1]
1454                                                 &= ~CD1400_COR2_ETC);
1455                                         com->etc = ETC_BREAK_ENDED;
1456                                         if (!(com->state & CS_ODONE)) {
1457                                                 com_events += LOTS_OF_EVENTS;
1458                                                 com->state |= CS_ODONE;
1459                                                 setsofttty();
1460                                         }
1461                                         break;
1462                                 case ETC_BREAK_ENDED:
1463                                         /*
1464                                          * Shouldn't get here.  Hope again.
1465                                          */
1466                                         break;
1467                                 }
1468                         }
1469                         if (com->intr_enable & CD1400_SRER_TXMPTY) {
1470                                 if (!(com->extra_state & CSE_ODONE)) {
1471                                         com_events += LOTS_OF_EVENTS;
1472                                         com->extra_state |= CSE_ODONE;
1473                                         setsofttty();
1474                                 }
1475                                 cd_outb(iobase, CD1400_SRER, cy_align,
1476                                         com->intr_enable
1477                                         &= ~CD1400_SRER_TXMPTY);
1478                                 goto terminate_tx_service;
1479                         }
1480                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
1481                         u_char  *ioptr;
1482                         u_int   ocount;
1483
1484                         ioptr = com->obufq.l_head;
1485                                 ocount = com->obufq.l_tail - ioptr;
1486                                 if (ocount > CD1400_TX_FIFO_SIZE)
1487                                         ocount = CD1400_TX_FIFO_SIZE;
1488                                 com->bytes_out += ocount;
1489                                 do
1490                                         cd_outb(iobase, CD1400_TDR, cy_align,
1491                                                 *ioptr++);
1492                                 while (--ocount != 0);
1493                         com->obufq.l_head = ioptr;
1494                         if (ioptr >= com->obufq.l_tail) {
1495                                 struct lbq      *qp;
1496
1497                                 qp = com->obufq.l_next;
1498                                 qp->l_queued = FALSE;
1499                                 qp = qp->l_next;
1500                                 if (qp != NULL) {
1501                                         com->obufq.l_head = qp->l_head;
1502                                         com->obufq.l_tail = qp->l_tail;
1503                                         com->obufq.l_next = qp;
1504                                 } else {
1505                                         /* output just completed */
1506                                         com->state &= ~CS_BUSY;
1507
1508                                         /*
1509                                          * The setting of CSE_ODONE may be
1510                                          * stale here.  We currently only
1511                                          * use it when CS_BUSY is set, and
1512                                          * fixing it when we clear CS_BUSY
1513                                          * is easiest.
1514                                          */
1515                                         if (com->extra_state & CSE_ODONE) {
1516                                                 com_events -= LOTS_OF_EVENTS;
1517                                                 com->extra_state &= ~CSE_ODONE;
1518                                         }
1519
1520                                         cd_outb(iobase, CD1400_SRER, cy_align,
1521                                                 com->intr_enable
1522                                                 = (com->intr_enable
1523                                                   & ~CD1400_SRER_TXRDY)
1524                                                   | CD1400_SRER_TXMPTY);
1525                                 }
1526                                 if (!(com->state & CS_ODONE)) {
1527                                         com_events += LOTS_OF_EVENTS;
1528                                         com->state |= CS_ODONE;
1529
1530                                         /* handle at high level ASAP */
1531                                         setsofttty();
1532                                 }
1533                         }
1534                 }
1535
1536                         /* terminate service context */
1537 terminate_tx_service:
1538 #ifdef PollMode
1539                         cd_outb(iobase, CD1400_TIR, cy_align,
1540                                 save_tir
1541                                 & ~(CD1400_TIR_RDIREQ | CD1400_TIR_RBUSY));
1542 #else
1543                         cd_outb(iobase, CD1400_EOSRR, cy_align, 0);
1544 #endif
1545                 }
1546         }
1547
1548         /* ensure an edge for the next interrupt */
1549         cy_outb(cy_iobase, CY_CLEAR_INTR, cy_align, 0);
1550
1551         schedsofttty();
1552
1553         com_unlock();
1554 }
1555
1556 #if 0
1557 static void
1558 siointr1(com)
1559         struct com_s    *com;
1560 {
1561 }
1562 #endif
1563
1564 static int
1565 sioioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
1566 {
1567         struct com_s    *com;
1568         int             error;
1569         int             mynor;
1570         int             s;
1571         struct tty      *tp;
1572 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1573         int             oldcmd;
1574         struct termios  term;
1575 #endif
1576
1577         mynor = minor(dev);
1578         com = com_addr(MINOR_TO_UNIT(mynor));
1579         if (mynor & CONTROL_MASK) {
1580                 struct termios  *ct;
1581
1582                 switch (mynor & CONTROL_MASK) {
1583                 case CONTROL_INIT_STATE:
1584                         ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in;
1585                         break;
1586                 case CONTROL_LOCK_STATE:
1587                         ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in;
1588                         break;
1589                 default:
1590                         return (ENODEV);        /* /dev/nodev */
1591                 }
1592                 switch (cmd) {
1593                 case TIOCSETA:
1594                         error = suser(td);
1595                         if (error != 0)
1596                                 return (error);
1597                         *ct = *(struct termios *)data;
1598                         return (0);
1599                 case TIOCGETA:
1600                         *(struct termios *)data = *ct;
1601                         return (0);
1602                 case TIOCGETD:
1603                         *(int *)data = TTYDISC;
1604                         return (0);
1605                 case TIOCGWINSZ:
1606                         bzero(data, sizeof(struct winsize));
1607                         return (0);
1608                 default:
1609                         return (ENOTTY);
1610                 }
1611         }
1612         tp = com->tp;
1613 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1614         term = tp->t_termios;
1615         oldcmd = cmd;
1616         error = ttsetcompat(tp, &cmd, data, &term);
1617         if (error != 0)
1618                 return (error);
1619         if (cmd != oldcmd)
1620                 data = (caddr_t)&term;
1621 #endif
1622         if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
1623                 int     cc;
1624                 struct termios *dt = (struct termios *)data;
1625                 struct termios *lt = mynor & CALLOUT_MASK
1626                                      ? &com->lt_out : &com->lt_in;
1627
1628                 dt->c_iflag = (tp->t_iflag & lt->c_iflag)
1629                               | (dt->c_iflag & ~lt->c_iflag);
1630                 dt->c_oflag = (tp->t_oflag & lt->c_oflag)
1631                               | (dt->c_oflag & ~lt->c_oflag);
1632                 dt->c_cflag = (tp->t_cflag & lt->c_cflag)
1633                               | (dt->c_cflag & ~lt->c_cflag);
1634                 dt->c_lflag = (tp->t_lflag & lt->c_lflag)
1635                               | (dt->c_lflag & ~lt->c_lflag);
1636                 for (cc = 0; cc < NCCS; ++cc)
1637                         if (lt->c_cc[cc] != 0)
1638                                 dt->c_cc[cc] = tp->t_cc[cc];
1639                 if (lt->c_ispeed != 0)
1640                         dt->c_ispeed = tp->t_ispeed;
1641                 if (lt->c_ospeed != 0)
1642                         dt->c_ospeed = tp->t_ospeed;
1643         }
1644         error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
1645         if (error != ENOIOCTL)
1646                 return (error);
1647         s = spltty();
1648         error = ttioctl(tp, cmd, data, flag);
1649         disc_optim(tp, &tp->t_termios, com);
1650         if (error != ENOIOCTL) {
1651                 splx(s);
1652                 return (error);
1653         }
1654         switch (cmd) {
1655         case TIOCSBRK:
1656 #if 0
1657                 outb(iobase + com_cfcr, com->cfcr_image |= CFCR_SBREAK);
1658 #else
1659                 cd_etc(com, CD1400_ETC_SENDBREAK);
1660 #endif
1661                 break;
1662         case TIOCCBRK:
1663 #if 0
1664                 outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
1665 #else
1666                 cd_etc(com, CD1400_ETC_STOPBREAK);
1667 #endif
1668                 break;
1669         case TIOCSDTR:
1670                 (void)commctl(com, TIOCM_DTR, DMBIS);
1671                 break;
1672         case TIOCCDTR:
1673                 (void)commctl(com, TIOCM_DTR, DMBIC);
1674                 break;
1675         /*
1676          * XXX should disallow changing MCR_RTS if CS_RTS_IFLOW is set.  The
1677          * changes get undone on the next call to comparam().
1678          */
1679         case TIOCMSET:
1680                 (void)commctl(com, *(int *)data, DMSET);
1681                 break;
1682         case TIOCMBIS:
1683                 (void)commctl(com, *(int *)data, DMBIS);
1684                 break;
1685         case TIOCMBIC:
1686                 (void)commctl(com, *(int *)data, DMBIC);
1687                 break;
1688         case TIOCMGET:
1689                 *(int *)data = commctl(com, 0, DMGET);
1690                 break;
1691         case TIOCMSDTRWAIT:
1692                 /* must be root since the wait applies to following logins */
1693                 error = suser(td);
1694                 if (error != 0) {
1695                         splx(s);
1696                         return (error);
1697                 }
1698                 com->dtr_wait = *(int *)data * hz / 100;
1699                 break;
1700         case TIOCMGDTRWAIT:
1701                 *(int *)data = com->dtr_wait * 100 / hz;
1702                 break;
1703         case TIOCTIMESTAMP:
1704                 com->do_timestamp = TRUE;
1705                 *(struct timeval *)data = com->timestamp;
1706                 break;
1707         case TIOCDCDTIMESTAMP:
1708                 com->do_dcd_timestamp = TRUE;
1709                 *(struct timeval *)data = com->dcd_timestamp;
1710                 break;
1711         default:
1712                 splx(s);
1713                 return (ENOTTY);
1714         }
1715         splx(s);
1716         return (0);
1717 }
1718
1719 static void
1720 siopoll(void *data)
1721 {
1722         int             unit;
1723
1724 #ifdef CyDebug
1725         ++cy_timeouts;
1726 #endif
1727         if (com_events == 0)
1728                 return;
1729 repeat:
1730         for (unit = 0; unit < NSIO; ++unit) {
1731                 struct com_s    *com;
1732                 int             incc;
1733                 struct tty      *tp;
1734
1735                 com = com_addr(unit);
1736                 if (com == NULL)
1737                         continue;
1738                 tp = com->tp;
1739                 if (tp == NULL) {
1740                         /*
1741                          * XXX forget any events related to closed devices
1742                          * (actually never opened devices) so that we don't
1743                          * loop.
1744                          */
1745                         disable_intr();
1746                         incc = com->iptr - com->ibuf;
1747                         com->iptr = com->ibuf;
1748                         if (com->state & CS_CHECKMSR) {
1749                                 incc += LOTS_OF_EVENTS;
1750                                 com->state &= ~CS_CHECKMSR;
1751                         }
1752                         com_events -= incc;
1753                         enable_intr();
1754                         if (incc != 0)
1755                                 log(LOG_DEBUG,
1756                                     "sio%d: %d events for device with no tp\n",
1757                                     unit, incc);
1758                         continue;
1759                 }
1760                 if (com->iptr != com->ibuf) {
1761                         disable_intr();
1762                         sioinput(com);
1763                         enable_intr();
1764                 }
1765                 if (com->state & CS_CHECKMSR) {
1766                         u_char  delta_modem_status;
1767
1768                         disable_intr();
1769                         delta_modem_status = com->last_modem_status
1770                                              ^ com->prev_modem_status;
1771                         com->prev_modem_status = com->last_modem_status;
1772                         com_events -= LOTS_OF_EVENTS;
1773                         com->state &= ~CS_CHECKMSR;
1774                         enable_intr();
1775                         if (delta_modem_status & MSR_DCD)
1776                                 (*linesw[tp->t_line].l_modem)
1777                                         (tp, com->prev_modem_status & MSR_DCD);
1778                 }
1779                 if (com->extra_state & CSE_ODONE) {
1780                         disable_intr();
1781                         com_events -= LOTS_OF_EVENTS;
1782                         com->extra_state &= ~CSE_ODONE;
1783                         enable_intr();
1784                         if (!(com->state & CS_BUSY)) {
1785                                 tp->t_state &= ~TS_BUSY;
1786                                 ttwwakeup(com->tp);
1787                         }
1788                         if (com->etc != ETC_NONE) {
1789                                 if (com->etc == ETC_BREAK_ENDED)
1790                                         com->etc = ETC_NONE;
1791                                 wakeup(&com->etc);
1792                         }
1793                 }
1794                 if (com->state & CS_ODONE) {
1795                         disable_intr();
1796                         com_events -= LOTS_OF_EVENTS;
1797                         com->state &= ~CS_ODONE;
1798                         enable_intr();
1799                         (*linesw[tp->t_line].l_start)(tp);
1800                 }
1801                 if (com_events == 0)
1802                         break;
1803         }
1804         if (com_events >= LOTS_OF_EVENTS)
1805                 goto repeat;
1806 }
1807
1808 static int
1809 comparam(tp, t)
1810         struct tty      *tp;
1811         struct termios  *t;
1812 {
1813         int             bits;
1814         int             cflag;
1815         struct com_s    *com;
1816         u_char          cor_change;
1817         u_long          cy_clock;
1818         int             idivisor;
1819         int             iflag;
1820         int             iprescaler;
1821         int             itimeout;
1822         int             odivisor;
1823         int             oprescaler;
1824         u_char          opt;
1825         int             s;
1826         int             unit;
1827
1828         /* do historical conversions */
1829         if (t->c_ispeed == 0)
1830                 t->c_ispeed = t->c_ospeed;
1831
1832         unit = DEV_TO_UNIT(tp->t_dev);
1833         com = com_addr(unit);
1834
1835         /* check requested parameters */
1836         cy_clock = CY_CLOCK(com->gfrcr_image);
1837         idivisor = comspeed(t->c_ispeed, cy_clock, &iprescaler);
1838         if (idivisor < 0)
1839                 return (EINVAL);
1840         odivisor = comspeed(t->c_ospeed, cy_clock, &oprescaler);
1841         if (odivisor < 0)
1842                 return (EINVAL);
1843
1844         /* parameters are OK, convert them to the com struct and the device */
1845         s = spltty();
1846         if (odivisor == 0)
1847                 (void)commctl(com, TIOCM_DTR, DMBIC);   /* hang up line */
1848         else
1849                 (void)commctl(com, TIOCM_DTR, DMBIS);
1850
1851         /*
1852          * This returns with interrupts disabled so that we can complete
1853          * the speed change atomically.
1854          */
1855         (void) siosetwater(com, t->c_ispeed);
1856
1857         /* XXX we don't actually change the speed atomically. */
1858         enable_intr();
1859
1860         if (idivisor != 0) {
1861                 cd_setreg(com, CD1400_RBPR, idivisor);
1862                 cd_setreg(com, CD1400_RCOR, iprescaler);
1863         }
1864         if (odivisor != 0) {
1865                 cd_setreg(com, CD1400_TBPR, odivisor);
1866                 cd_setreg(com, CD1400_TCOR, oprescaler);
1867         }
1868
1869         /*
1870          * channel control
1871          *      receiver enable
1872          *      transmitter enable (always set)
1873          */
1874         cflag = t->c_cflag;
1875         opt = CD1400_CCR_CMDCHANCTL | CD1400_CCR_XMTEN
1876               | (cflag & CREAD ? CD1400_CCR_RCVEN : CD1400_CCR_RCVDIS);
1877         if (opt != com->channel_control) {
1878                 com->channel_control = opt;
1879                 cd1400_channel_cmd(com, opt);
1880         }
1881
1882 #ifdef Smarts
1883         /* set special chars */
1884         /* XXX if one is _POSIX_VDISABLE, can't use some others */
1885         if (t->c_cc[VSTOP] != _POSIX_VDISABLE)
1886                 cd_setreg(com, CD1400_SCHR1, t->c_cc[VSTOP]);
1887         if (t->c_cc[VSTART] != _POSIX_VDISABLE)
1888                 cd_setreg(com, CD1400_SCHR2, t->c_cc[VSTART]);
1889         if (t->c_cc[VINTR] != _POSIX_VDISABLE)
1890                 cd_setreg(com, CD1400_SCHR3, t->c_cc[VINTR]);
1891         if (t->c_cc[VSUSP] != _POSIX_VDISABLE)
1892                 cd_setreg(com, CD1400_SCHR4, t->c_cc[VSUSP]);
1893 #endif
1894
1895         /*
1896          * set channel option register 1 -
1897          *      parity mode
1898          *      stop bits
1899          *      char length
1900          */
1901         opt = 0;
1902         /* parity */
1903         if (cflag & PARENB) {
1904                 if (cflag & PARODD)
1905                         opt |= CD1400_COR1_PARODD;
1906                 opt |= CD1400_COR1_PARNORMAL;
1907         }
1908         iflag = t->c_iflag;
1909         if (!(iflag & INPCK))
1910                 opt |= CD1400_COR1_NOINPCK;
1911         bits = 1 + 1;
1912         /* stop bits */
1913         if (cflag & CSTOPB) {
1914                 ++bits;
1915                 opt |= CD1400_COR1_STOP2;
1916         }
1917         /* char length */
1918         switch (cflag & CSIZE) {
1919         case CS5:
1920                 bits += 5;
1921                 opt |= CD1400_COR1_CS5;
1922                 break;
1923         case CS6:
1924                 bits += 6;
1925                 opt |= CD1400_COR1_CS6;
1926                 break;
1927         case CS7:
1928                 bits += 7;
1929                 opt |= CD1400_COR1_CS7;
1930                 break;
1931         default:
1932                 bits += 8;
1933                 opt |= CD1400_COR1_CS8;
1934                 break;
1935         }
1936         cor_change = 0;
1937         if (opt != com->cor[0]) {
1938                 cor_change |= CD1400_CCR_COR1;
1939                 cd_setreg(com, CD1400_COR1, com->cor[0] = opt);
1940         }
1941
1942         /*
1943          * Set receive time-out period, normally to max(one char time, 5 ms).
1944          */
1945         if (t->c_ispeed == 0)
1946                 itimeout = cd_getreg(com, CD1400_RTPR);
1947         else {
1948                 itimeout = (1000 * bits + t->c_ispeed - 1) / t->c_ispeed;
1949 #ifdef SOFT_HOTCHAR
1950 #define MIN_RTP         1
1951 #else
1952 #define MIN_RTP         5
1953 #endif
1954                 if (itimeout < MIN_RTP)
1955                         itimeout = MIN_RTP;
1956         }
1957         if (!(t->c_lflag & ICANON) && t->c_cc[VMIN] != 0 && t->c_cc[VTIME] != 0
1958             && t->c_cc[VTIME] * 10 > itimeout)
1959                 itimeout = t->c_cc[VTIME] * 10;
1960         if (itimeout > 255)
1961                 itimeout = 255;
1962         cd_setreg(com, CD1400_RTPR, itimeout);
1963
1964         /*
1965          * set channel option register 2 -
1966          *      flow control
1967          */
1968         opt = 0;
1969 #ifdef Smarts
1970         if (iflag & IXANY)
1971                 opt |= CD1400_COR2_IXANY;
1972         if (iflag & IXOFF)
1973                 opt |= CD1400_COR2_IXOFF;
1974 #endif
1975 #ifndef SOFT_CTS_OFLOW
1976         if (cflag & CCTS_OFLOW)
1977                 opt |= CD1400_COR2_CCTS_OFLOW;
1978 #endif
1979         disable_intr();
1980         if (opt != com->cor[1]) {
1981                 cor_change |= CD1400_CCR_COR2;
1982                 cd_setreg(com, CD1400_COR2, com->cor[1] = opt);
1983         }
1984         enable_intr();
1985
1986         /*
1987          * set channel option register 3 -
1988          *      receiver FIFO interrupt threshold
1989          *      flow control
1990          */
1991         opt = RxFifoThreshold;
1992 #ifdef Smarts
1993         if (t->c_lflag & ICANON)
1994                 opt |= CD1400_COR3_SCD34;       /* detect INTR & SUSP chars */
1995         if (iflag & IXOFF)
1996                 /* detect and transparently handle START and STOP chars */
1997                 opt |= CD1400_COR3_FCT | CD1400_COR3_SCD12;
1998 #endif
1999         if (opt != com->cor[2]) {
2000                 cor_change |= CD1400_CCR_COR3;
2001                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
2002         }
2003
2004         /* notify the CD1400 if COR1-3 have changed */
2005         if (cor_change)
2006                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | cor_change);
2007
2008         /*
2009          * set channel option register 4 -
2010          *      CR/NL processing
2011          *      break processing
2012          *      received exception processing
2013          */
2014         opt = 0;
2015         if (iflag & IGNCR)
2016                 opt |= CD1400_COR4_IGNCR;
2017 #ifdef Smarts
2018         /*
2019          * we need a new ttyinput() for this, as we don't want to
2020          * have ICRNL && INLCR being done in both layers, or to have
2021          * synchronisation problems
2022          */
2023         if (iflag & ICRNL)
2024                 opt |= CD1400_COR4_ICRNL;
2025         if (iflag & INLCR)
2026                 opt |= CD1400_COR4_INLCR;
2027 #endif
2028         if (iflag & IGNBRK)
2029                 opt |= CD1400_COR4_IGNBRK | CD1400_COR4_NOBRKINT;
2030         /*
2031          * The `-ignbrk -brkint parmrk' case is not handled by the hardware,
2032          * so only tell the hardware about -brkint if -parmrk.
2033          */
2034         if (!(iflag & (BRKINT | PARMRK)))
2035                 opt |= CD1400_COR4_NOBRKINT;
2036 #if 0
2037         /* XXX using this "intelligence" breaks reporting of overruns. */
2038         if (iflag & IGNPAR)
2039                 opt |= CD1400_COR4_PFO_DISCARD;
2040         else {
2041                 if (iflag & PARMRK)
2042                         opt |= CD1400_COR4_PFO_ESC;
2043                 else
2044                         opt |= CD1400_COR4_PFO_NUL;
2045         }
2046 #else
2047         opt |= CD1400_COR4_PFO_EXCEPTION;
2048 #endif
2049         cd_setreg(com, CD1400_COR4, opt);
2050
2051         /*
2052          * set channel option register 5 -
2053          */
2054         opt = 0;
2055         if (iflag & ISTRIP)
2056                 opt |= CD1400_COR5_ISTRIP;
2057         if (t->c_iflag & IEXTEN)
2058                 /* enable LNEXT (e.g. ctrl-v quoting) handling */
2059                 opt |= CD1400_COR5_LNEXT;
2060 #ifdef Smarts
2061         if (t->c_oflag & ONLCR)
2062                 opt |= CD1400_COR5_ONLCR;
2063         if (t->c_oflag & OCRNL)
2064                 opt |= CD1400_COR5_OCRNL;
2065 #endif
2066         cd_setreg(com, CD1400_COR5, opt);
2067
2068         /*
2069          * We always generate modem status change interrupts for CD changes.
2070          * Among other things, this is necessary to track TS_CARR_ON for
2071          * pstat to print even when the driver doesn't care.  CD changes
2072          * should be rare so interrupts for them are not worth extra code to
2073          * avoid.  We avoid interrupts for other modem status changes (except
2074          * for CTS changes when SOFT_CTS_OFLOW is configured) since this is
2075          * simplest and best.
2076          */
2077
2078         /*
2079          * set modem change option register 1
2080          *      generate modem interrupts on which 1 -> 0 input transitions
2081          *      also controls auto-DTR output flow-control, which we don't use
2082          */
2083         opt = CD1400_MCOR1_CDzd;
2084 #ifdef SOFT_CTS_OFLOW
2085         if (cflag & CCTS_OFLOW)
2086                 opt |= CD1400_MCOR1_CTSzd;
2087 #endif
2088         cd_setreg(com, CD1400_MCOR1, opt);
2089
2090         /*
2091          * set modem change option register 2
2092          *      generate modem interrupts on specific 0 -> 1 input transitions
2093          */
2094         opt = CD1400_MCOR2_CDod;
2095 #ifdef SOFT_CTS_OFLOW
2096         if (cflag & CCTS_OFLOW)
2097                 opt |= CD1400_MCOR2_CTSod;
2098 #endif
2099         cd_setreg(com, CD1400_MCOR2, opt);
2100
2101         /*
2102          * XXX should have done this long ago, but there is too much state
2103          * to change all atomically.
2104          */
2105         disable_intr();
2106
2107         com->state &= ~CS_TTGO;
2108         if (!(tp->t_state & TS_TTSTOP))
2109                 com->state |= CS_TTGO;
2110         if (cflag & CRTS_IFLOW) {
2111                 com->state |= CS_RTS_IFLOW;
2112                 /*
2113                  * If CS_RTS_IFLOW just changed from off to on, the change
2114                  * needs to be propagated to MCR_RTS.  This isn't urgent,
2115                  * so do it later by calling comstart() instead of repeating
2116                  * a lot of code from comstart() here.
2117                  */
2118         } else if (com->state & CS_RTS_IFLOW) {
2119                 com->state &= ~CS_RTS_IFLOW;
2120                 /*
2121                  * CS_RTS_IFLOW just changed from on to off.  Force MCR_RTS
2122                  * on here, since comstart() won't do it later.
2123                  */
2124 #if 0
2125                 outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2126 #else
2127                 cd_setreg(com, com->mcr_rts_reg,
2128                           com->mcr_image |= com->mcr_rts);
2129 #endif
2130         }
2131
2132         /*
2133          * Set up state to handle output flow control.
2134          * XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
2135          * Now has 10+ msec latency, while CTS flow has 50- usec latency.
2136          */
2137         com->state |= CS_ODEVREADY;
2138 #ifdef SOFT_CTS_OFLOW
2139         com->state &= ~CS_CTS_OFLOW;
2140         if (cflag & CCTS_OFLOW) {
2141                 com->state |= CS_CTS_OFLOW;
2142                 if (!(com->last_modem_status & MSR_CTS))
2143                         com->state &= ~CS_ODEVREADY;
2144         }
2145 #endif
2146         /* XXX shouldn't call functions while intrs are disabled. */
2147         disc_optim(tp, t, com);
2148 #if 0
2149         /*
2150          * Recover from fiddling with CS_TTGO.  We used to call siointr1()
2151          * unconditionally, but that defeated the careful discarding of
2152          * stale input in sioopen().
2153          */
2154         if (com->state >= (CS_BUSY | CS_TTGO))
2155                 siointr1(com);
2156 #endif
2157         if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
2158                 if (!(com->intr_enable & CD1400_SRER_TXRDY))
2159                         cd_setreg(com, CD1400_SRER,
2160                                   com->intr_enable
2161                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
2162                                     | CD1400_SRER_TXRDY);
2163         } else {
2164                 if (com->intr_enable & CD1400_SRER_TXRDY)
2165                         cd_setreg(com, CD1400_SRER,
2166                                   com->intr_enable
2167                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
2168                                     | CD1400_SRER_TXMPTY);
2169         }
2170
2171         enable_intr();
2172         splx(s);
2173         comstart(tp);
2174         if (com->ibufold != NULL) {
2175                 free(com->ibufold, M_DEVBUF);
2176                 com->ibufold = NULL;
2177         }
2178         return (0);
2179 }
2180
2181 static int
2182 siosetwater(com, speed)
2183         struct com_s    *com;
2184         speed_t         speed;
2185 {
2186         int             cp4ticks;
2187         u_char          *ibuf;
2188         int             ibufsize;
2189         struct tty      *tp;
2190
2191         /*
2192          * Make the buffer size large enough to handle a softtty interrupt
2193          * latency of about 2 ticks without loss of throughput or data
2194          * (about 3 ticks if input flow control is not used or not honoured,
2195          * but a bit less for CS5-CS7 modes).
2196          */
2197         cp4ticks = speed / 10 / hz * 4;
2198         for (ibufsize = 128; ibufsize < cp4ticks;)
2199                 ibufsize <<= 1;
2200         if (ibufsize == com->ibufsize) {
2201                 disable_intr();
2202                 return (0);
2203         }
2204
2205         /*
2206          * Allocate input buffer.  The extra factor of 2 in the size is
2207          * to allow for an error byte for each input byte.
2208          */
2209         ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT);
2210         if (ibuf == NULL) {
2211                 disable_intr();
2212                 return (ENOMEM);
2213         }
2214
2215         /* Initialize non-critical variables. */
2216         com->ibufold = com->ibuf;
2217         com->ibufsize = ibufsize;
2218         tp = com->tp;
2219         if (tp != NULL) {
2220                 tp->t_ififosize = 2 * ibufsize;
2221                 tp->t_ispeedwat = (speed_t)-1;
2222                 tp->t_ospeedwat = (speed_t)-1;
2223         }
2224
2225         /*
2226          * Read current input buffer, if any.  Continue with interrupts
2227          * disabled.
2228          */
2229         disable_intr();
2230         if (com->iptr != com->ibuf)
2231                 sioinput(com);
2232
2233         /*-
2234          * Initialize critical variables, including input buffer watermarks.
2235          * The external device is asked to stop sending when the buffer
2236          * exactly reaches high water, or when the high level requests it.
2237          * The high level is notified immediately (rather than at a later
2238          * clock tick) when this watermark is reached.
2239          * The buffer size is chosen so the watermark should almost never
2240          * be reached.
2241          * The low watermark is invisibly 0 since the buffer is always
2242          * emptied all at once.
2243          */
2244         com->iptr = com->ibuf = ibuf;
2245         com->ibufend = ibuf + ibufsize;
2246         com->ierroff = ibufsize;
2247         com->ihighwater = ibuf + 3 * ibufsize / 4;
2248         return (0);
2249 }
2250
2251 static void
2252 comstart(tp)
2253         struct tty      *tp;
2254 {
2255         struct com_s    *com;
2256         int             s;
2257 #ifdef CyDebug
2258         bool_t          started;
2259 #endif
2260         int             unit;
2261
2262         unit = DEV_TO_UNIT(tp->t_dev);
2263         com = com_addr(unit);
2264         s = spltty();
2265
2266 #ifdef CyDebug
2267         ++com->start_count;
2268         started = FALSE;
2269 #endif
2270
2271         disable_intr();
2272         if (tp->t_state & TS_TTSTOP) {
2273                 com->state &= ~CS_TTGO;
2274                 if (com->intr_enable & CD1400_SRER_TXRDY)
2275                         cd_setreg(com, CD1400_SRER,
2276                                   com->intr_enable
2277                                   = (com->intr_enable & ~CD1400_SRER_TXRDY)
2278                                     | CD1400_SRER_TXMPTY);
2279         } else {
2280                 com->state |= CS_TTGO;
2281                 if (com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)
2282                     && !(com->intr_enable & CD1400_SRER_TXRDY))
2283                         cd_setreg(com, CD1400_SRER,
2284                                   com->intr_enable
2285                                   = (com->intr_enable & ~CD1400_SRER_TXMPTY)
2286                                     | CD1400_SRER_TXRDY);
2287         }
2288         if (tp->t_state & TS_TBLOCK) {
2289                 if (com->mcr_image & com->mcr_rts && com->state & CS_RTS_IFLOW)
2290 #if 0
2291                         outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
2292 #else
2293                         cd_setreg(com, com->mcr_rts_reg,
2294                                   com->mcr_image &= ~com->mcr_rts);
2295 #endif
2296         } else {
2297                 if (!(com->mcr_image & com->mcr_rts)
2298                     && com->iptr < com->ihighwater
2299                     && com->state & CS_RTS_IFLOW)
2300 #if 0
2301                         outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
2302 #else
2303                         cd_setreg(com, com->mcr_rts_reg,
2304                                   com->mcr_image |= com->mcr_rts);
2305 #endif
2306         }
2307         enable_intr();
2308         if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
2309                 ttwwakeup(tp);
2310                 splx(s);
2311                 return;
2312         }
2313         if (tp->t_outq.c_cc != 0) {
2314                 struct lbq      *qp;
2315                 struct lbq      *next;
2316
2317                 if (!com->obufs[0].l_queued) {
2318 #ifdef CyDebug
2319                         started = TRUE;
2320 #endif
2321                         com->obufs[0].l_tail
2322                             = com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
2323                                                   sizeof com->obuf1);
2324                         com->obufs[0].l_next = NULL;
2325                         com->obufs[0].l_queued = TRUE;
2326                         disable_intr();
2327                         if (com->state & CS_BUSY) {
2328                                 qp = com->obufq.l_next;
2329                                 while ((next = qp->l_next) != NULL)
2330                                         qp = next;
2331                                 qp->l_next = &com->obufs[0];
2332                         } else {
2333                                 com->obufq.l_head = com->obufs[0].l_head;
2334                                 com->obufq.l_tail = com->obufs[0].l_tail;
2335                                 com->obufq.l_next = &com->obufs[0];
2336                                 com->state |= CS_BUSY;
2337                                 if (com->state >= (CS_BUSY | CS_TTGO
2338                                                    | CS_ODEVREADY))
2339                                         cd_setreg(com, CD1400_SRER,
2340                                                   com->intr_enable
2341                                                   = (com->intr_enable
2342                                                     & ~CD1400_SRER_TXMPTY)
2343                                                     | CD1400_SRER_TXRDY);
2344                         }
2345                         enable_intr();
2346                 }
2347                 if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
2348 #ifdef CyDebug
2349                         started = TRUE;
2350 #endif
2351                         com->obufs[1].l_tail
2352                             = com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
2353                                                   sizeof com->obuf2);
2354                         com->obufs[1].l_next = NULL;
2355                         com->obufs[1].l_queued = TRUE;
2356                         disable_intr();
2357                         if (com->state & CS_BUSY) {
2358                                 qp = com->obufq.l_next;
2359                                 while ((next = qp->l_next) != NULL)
2360                                         qp = next;
2361                                 qp->l_next = &com->obufs[1];
2362                         } else {
2363                                 com->obufq.l_head = com->obufs[1].l_head;
2364                                 com->obufq.l_tail = com->obufs[1].l_tail;
2365                                 com->obufq.l_next = &com->obufs[1];
2366                                 com->state |= CS_BUSY;
2367                                 if (com->state >= (CS_BUSY | CS_TTGO
2368                                                    | CS_ODEVREADY))
2369                                         cd_setreg(com, CD1400_SRER,
2370                                                   com->intr_enable
2371                                                   = (com->intr_enable
2372                                                     & ~CD1400_SRER_TXMPTY)
2373                                                     | CD1400_SRER_TXRDY);
2374                         }
2375                         enable_intr();
2376                 }
2377                 tp->t_state |= TS_BUSY;
2378         }
2379 #ifdef CyDebug
2380         if (started)
2381                 ++com->start_real;
2382 #endif
2383 #if 0
2384         disable_intr();
2385         if (com->state >= (CS_BUSY | CS_TTGO))
2386                 siointr1(com);  /* fake interrupt to start output */
2387         enable_intr();
2388 #endif
2389         ttwwakeup(tp);
2390         splx(s);
2391 }
2392
2393 static void
2394 comstop(tp, rw)
2395         struct tty      *tp;
2396         int             rw;
2397 {
2398         struct com_s    *com;
2399         bool_t          wakeup_etc;
2400
2401         com = com_addr(DEV_TO_UNIT(tp->t_dev));
2402         wakeup_etc = FALSE;
2403         disable_intr();
2404         if (rw & FWRITE) {
2405                 com->obufs[0].l_queued = FALSE;
2406                 com->obufs[1].l_queued = FALSE;
2407                 if (com->extra_state & CSE_ODONE) {
2408                         com_events -= LOTS_OF_EVENTS;
2409                         com->extra_state &= ~CSE_ODONE;
2410                         if (com->etc != ETC_NONE) {
2411                                 if (com->etc == ETC_BREAK_ENDED)
2412                                         com->etc = ETC_NONE;
2413                                 wakeup_etc = TRUE;
2414                         }
2415                 }
2416                 com->tp->t_state &= ~TS_BUSY;
2417                 if (com->state & CS_ODONE)
2418                         com_events -= LOTS_OF_EVENTS;
2419                 com->state &= ~(CS_ODONE | CS_BUSY);
2420         }
2421         if (rw & FREAD) {
2422                 /* XXX no way to reset only input fifo. */
2423                 com_events -= (com->iptr - com->ibuf);
2424                 com->iptr = com->ibuf;
2425         }
2426         enable_intr();
2427         if (wakeup_etc)
2428                 wakeup(&com->etc);
2429         if (rw & FWRITE && com->etc == ETC_NONE)
2430                 cd1400_channel_cmd(com, CD1400_CCR_CMDRESET | CD1400_CCR_FTF);
2431         comstart(tp);
2432 }
2433
2434 static int
2435 commctl(com, bits, how)
2436         struct com_s    *com;
2437         int             bits;
2438         int             how;
2439 {
2440         int     mcr;
2441         int     msr;
2442
2443         if (how == DMGET) {
2444                 if (com->channel_control & CD1400_CCR_RCVEN)
2445                         bits |= TIOCM_LE;
2446                 mcr = com->mcr_image;
2447                 if (mcr & com->mcr_dtr)
2448                         bits |= TIOCM_DTR;
2449                 if (mcr & com->mcr_rts)
2450                         /* XXX wired on for Cyclom-8Ys */
2451                         bits |= TIOCM_RTS;
2452
2453                 /*
2454                  * We must read the modem status from the hardware because
2455                  * we don't generate modem status change interrupts for all
2456                  * changes, so com->prev_modem_status is not guaranteed to
2457                  * be up to date.  This is safe, unlike for sio, because
2458                  * reading the status register doesn't clear pending modem
2459                  * status change interrupts.
2460                  */
2461                 msr = cd_getreg(com, CD1400_MSVR2);
2462
2463                 if (msr & MSR_CTS)
2464                         bits |= TIOCM_CTS;
2465                 if (msr & MSR_DCD)
2466                         bits |= TIOCM_CD;
2467                 if (msr & MSR_DSR)
2468                         bits |= TIOCM_DSR;
2469                 if (msr & MSR_RI)
2470                         /* XXX not connected except for Cyclom-16Y? */
2471                         bits |= TIOCM_RI;
2472                 return (bits);
2473         }
2474         mcr = 0;
2475         if (bits & TIOCM_DTR)
2476                 mcr |= com->mcr_dtr;
2477         if (bits & TIOCM_RTS)
2478                 mcr |= com->mcr_rts;
2479         disable_intr();
2480         switch (how) {
2481         case DMSET:
2482                 com->mcr_image = mcr;
2483                 cd_setreg(com, CD1400_MSVR1, mcr);
2484                 cd_setreg(com, CD1400_MSVR2, mcr);
2485                 break;
2486         case DMBIS:
2487                 com->mcr_image = mcr = com->mcr_image | mcr;
2488                 cd_setreg(com, CD1400_MSVR1, mcr);
2489                 cd_setreg(com, CD1400_MSVR2, mcr);
2490                 break;
2491         case DMBIC:
2492                 com->mcr_image = mcr = com->mcr_image & ~mcr;
2493                 cd_setreg(com, CD1400_MSVR1, mcr);
2494                 cd_setreg(com, CD1400_MSVR2, mcr);
2495                 break;
2496         }
2497         enable_intr();
2498         return (0);
2499 }
2500
2501 static void
2502 siosettimeout()
2503 {
2504         struct com_s    *com;
2505         bool_t          someopen;
2506         int             unit;
2507
2508         /*
2509          * Set our timeout period to 1 second if no polled devices are open.
2510          * Otherwise set it to max(1/200, 1/hz).
2511          * Enable timeouts iff some device is open.
2512          */
2513         untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
2514         sio_timeout = hz;
2515         someopen = FALSE;
2516         for (unit = 0; unit < NSIO; ++unit) {
2517                 com = com_addr(unit);
2518                 if (com != NULL && com->tp != NULL
2519                     && com->tp->t_state & TS_ISOPEN) {
2520                         someopen = TRUE;
2521 #if 0
2522                         if (com->poll || com->poll_output) {
2523                                 sio_timeout = hz > 200 ? hz / 200 : 1;
2524                                 break;
2525                         }
2526 #endif
2527                 }
2528         }
2529         if (someopen) {
2530                 sio_timeouts_until_log = hz / sio_timeout;
2531                 sio_timeout_handle = timeout(comwakeup, (void *)NULL,
2532                                              sio_timeout);
2533         } else {
2534                 /* Flush error messages, if any. */
2535                 sio_timeouts_until_log = 1;
2536                 comwakeup((void *)NULL);
2537                 untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
2538         }
2539 }
2540
2541 static void
2542 comwakeup(chan)
2543         void    *chan;
2544 {
2545         struct com_s    *com;
2546         int             unit;
2547
2548         sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout);
2549
2550 #if 0
2551         /*
2552          * Recover from lost output interrupts.
2553          * Poll any lines that don't use interrupts.
2554          */
2555         for (unit = 0; unit < NSIO; ++unit) {
2556                 com = com_addr(unit);
2557                 if (com != NULL
2558                     && (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
2559                         disable_intr();
2560                         siointr1(com);
2561                         enable_intr();
2562                 }
2563         }
2564 #endif
2565
2566         /*
2567          * Check for and log errors, but not too often.
2568          */
2569         if (--sio_timeouts_until_log > 0)
2570                 return;
2571         sio_timeouts_until_log = hz / sio_timeout;
2572         for (unit = 0; unit < NSIO; ++unit) {
2573                 int     errnum;
2574
2575                 com = com_addr(unit);
2576                 if (com == NULL)
2577                         continue;
2578                 for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
2579                         u_int   delta;
2580                         u_long  total;
2581
2582                         disable_intr();
2583                         delta = com->delta_error_counts[errnum];
2584                         com->delta_error_counts[errnum] = 0;
2585                         enable_intr();
2586                         if (delta == 0)
2587                                 continue;
2588                         total = com->error_counts[errnum] += delta;
2589                         log(LOG_ERR, "cy%d: %u more %s%s (total %lu)\n",
2590                             unit, delta, error_desc[errnum],
2591                             delta == 1 ? "" : "s", total);
2592                 }
2593         }
2594 }
2595
2596 static void
2597 disc_optim(tp, t, com)
2598         struct tty      *tp;
2599         struct termios  *t;
2600         struct com_s    *com;
2601 {
2602 #ifndef SOFT_HOTCHAR
2603         u_char  opt;
2604 #endif
2605
2606         /*
2607          * XXX can skip a lot more cases if Smarts.  Maybe
2608          * (IGNCR | ISTRIP | IXON) in c_iflag.  But perhaps we
2609          * shouldn't skip if (TS_CNTTB | TS_LNCH) is set in t_state.
2610          */
2611         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
2612             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
2613             && (!(t->c_iflag & PARMRK)
2614                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
2615             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
2616             && linesw[tp->t_line].l_rint == ttyinput)
2617                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
2618         else
2619                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
2620         com->hotchar = linesw[tp->t_line].l_hotchar;
2621 #ifndef SOFT_HOTCHAR
2622         opt = com->cor[2] & ~CD1400_COR3_SCD34;
2623         if (com->hotchar != 0) {
2624                 cd_setreg(com, CD1400_SCHR3, com->hotchar);
2625                 cd_setreg(com, CD1400_SCHR4, com->hotchar);
2626                 opt |= CD1400_COR3_SCD34;
2627         }
2628         if (opt != com->cor[2]) {
2629                 cd_setreg(com, CD1400_COR3, com->cor[2] = opt);
2630                 cd1400_channel_cmd(com, CD1400_CCR_CMDCORCHG | CD1400_CCR_COR3);
2631         }
2632 #endif
2633 }
2634
2635 #ifdef Smarts
2636 /* standard line discipline input routine */
2637 int
2638 cyinput(c, tp)
2639         int             c;
2640         struct tty      *tp;
2641 {
2642         /* XXX duplicate ttyinput(), but without the IXOFF/IXON/ISTRIP/IPARMRK
2643          * bits, as they are done by the CD1400.  Hardly worth the effort,
2644          * given that high-throughput sessions are raw anyhow.
2645          */
2646 }
2647 #endif /* Smarts */
2648
2649 static int
2650 comspeed(speed, cy_clock, prescaler_io)
2651         speed_t speed;
2652         u_long  cy_clock;
2653         int     *prescaler_io;
2654 {
2655         int     actual;
2656         int     error;
2657         int     divider;
2658         int     prescaler;
2659         int     prescaler_unit;
2660
2661         if (speed == 0)
2662                 return (0);
2663         if (speed < 0 || speed > 150000)
2664                 return (-1);
2665
2666         /* determine which prescaler to use */
2667         for (prescaler_unit = 4, prescaler = 2048; prescaler_unit;
2668                 prescaler_unit--, prescaler >>= 2) {
2669                 if (cy_clock / prescaler / speed > 63)
2670                         break;
2671         }
2672
2673         divider = (cy_clock / prescaler * 2 / speed + 1) / 2; /* round off */
2674         if (divider > 255)
2675                 divider = 255;
2676         actual = cy_clock/prescaler/divider;
2677
2678         /* 10 times error in percent: */
2679         error = ((actual - (long)speed) * 2000 / (long)speed + 1) / 2;
2680
2681         /* 3.0% max error tolerance */
2682         if (error < -30 || error > 30)
2683                 return (-1);
2684
2685 #if 0
2686         printf("prescaler = %d (%d)\n", prescaler, prescaler_unit);
2687         printf("divider = %d (%x)\n", divider, divider);
2688         printf("actual = %d\n", actual);
2689         printf("error = %d\n", error);
2690 #endif
2691
2692         *prescaler_io = prescaler_unit;
2693         return (divider);
2694 }
2695
2696 static void
2697 cd1400_channel_cmd(com, cmd)
2698         struct com_s    *com;
2699         int             cmd;
2700 {
2701         cd1400_channel_cmd_wait(com);
2702         cd_setreg(com, CD1400_CCR, cmd);
2703         cd1400_channel_cmd_wait(com);
2704 }
2705
2706 static void
2707 cd1400_channel_cmd_wait(com)
2708         struct com_s    *com;
2709 {
2710         struct timeval  start;
2711         struct timeval  tv;
2712         long            usec;
2713
2714         if (cd_getreg(com, CD1400_CCR) == 0)
2715                 return;
2716         microtime(&start);
2717         for (;;) {
2718                 if (cd_getreg(com, CD1400_CCR) == 0)
2719                         return;
2720                 microtime(&tv);
2721                 usec = 1000000 * (tv.tv_sec - start.tv_sec) +
2722                     tv.tv_usec - start.tv_usec;
2723                 if (usec >= 5000) {
2724                         log(LOG_ERR,
2725                             "cy%d: channel command timeout (%ld usec)\n",
2726                             com->unit, usec);
2727                         return;
2728                 }
2729         }
2730 }
2731
2732 static void
2733 cd_etc(com, etc)
2734         struct com_s    *com;
2735         int             etc;
2736 {
2737         /*
2738          * We can't change the hardware's ETC state while there are any
2739          * characters in the tx fifo, since those characters would be
2740          * interpreted as commands!  Unputting characters from the fifo
2741          * is difficult, so we wait up to 12 character times for the fifo
2742          * to drain.  The command will be delayed for up to 2 character
2743          * times for the tx to become empty.  Unputting characters from
2744          * the tx holding and shift registers is impossible, so we wait
2745          * for the tx to become empty so that the command is sure to be
2746          * executed soon after we issue it.
2747          */
2748         disable_intr();
2749         if (com->etc == etc) {
2750                 enable_intr();
2751                 goto wait;
2752         }
2753         if ((etc == CD1400_ETC_SENDBREAK
2754             && (com->etc == ETC_BREAK_STARTING
2755                 || com->etc == ETC_BREAK_STARTED))
2756             || (etc == CD1400_ETC_STOPBREAK
2757                && (com->etc == ETC_BREAK_ENDING || com->etc == ETC_BREAK_ENDED
2758                    || com->etc == ETC_NONE))) {
2759                 enable_intr();
2760                 return;
2761         }
2762         com->etc = etc;
2763         cd_setreg(com, CD1400_SRER,
2764                   com->intr_enable
2765                   = (com->intr_enable & ~CD1400_SRER_TXRDY) | CD1400_SRER_TXMPTY);
2766         enable_intr();
2767 wait:
2768         while (com->etc == etc
2769                && tsleep(&com->etc, PCATCH, "cyetc", 0) == 0)
2770                 continue;
2771 }
2772
2773 static int
2774 cd_getreg(com, reg)
2775         struct com_s    *com;
2776         int             reg;
2777 {
2778         struct com_s    *basecom;
2779         u_char  car;
2780         int     cy_align;
2781         u_long  ef;
2782         cy_addr iobase;
2783         int     val;
2784
2785         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
2786         car = com->unit & CD1400_CAR_CHAN;
2787         cy_align = com->cy_align;
2788         iobase = com->iobase;
2789         ef = read_eflags();
2790         if (ef & PSL_I)
2791                 disable_intr();
2792         if (basecom->car != car)
2793                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
2794         val = cd_inb(iobase, reg, cy_align);
2795         if (ef & PSL_I)
2796                 enable_intr();
2797         return (val);
2798 }
2799
2800 static void
2801 cd_setreg(com, reg, val)
2802         struct com_s    *com;
2803         int             reg;
2804         int             val;
2805 {
2806         struct com_s    *basecom;
2807         u_char  car;
2808         int     cy_align;
2809         u_long  ef;
2810         cy_addr iobase;
2811
2812         basecom = com_addr(com->unit & ~(CD1400_NO_OF_CHANNELS - 1));
2813         car = com->unit & CD1400_CAR_CHAN;
2814         cy_align = com->cy_align;
2815         iobase = com->iobase;
2816         ef = read_eflags();
2817         if (ef & PSL_I)
2818                 disable_intr();
2819         if (basecom->car != car)
2820                 cd_outb(iobase, CD1400_CAR, cy_align, basecom->car = car);
2821         cd_outb(iobase, reg, cy_align, val);
2822         if (ef & PSL_I)
2823                 enable_intr();
2824 }
2825
2826 #ifdef CyDebug
2827 /* useful in ddb */
2828 void
2829 cystatus(unit)
2830         int     unit;
2831 {
2832         struct com_s    *com;
2833         cy_addr         iobase;
2834         u_int           ocount;
2835         struct tty      *tp;
2836
2837         com = com_addr(unit);
2838         printf("info for channel %d\n", unit);
2839         printf("------------------\n");
2840         printf("total cyclom service probes:\t%d\n", cy_svrr_probes);
2841         printf("calls to upper layer:\t\t%d\n", cy_timeouts);
2842         if (com == NULL)
2843                 return;
2844         iobase = com->iobase;
2845         printf("\n");
2846         printf("cd1400 base address:\\tt%p\n", iobase);
2847         printf("saved channel_control:\t\t0x%02x\n", com->channel_control);
2848         printf("saved cor1-3:\t\t\t0x%02x 0x%02x 0x%02x\n",
2849                com->cor[0], com->cor[1], com->cor[2]);
2850         printf("service request enable reg:\t0x%02x (0x%02x cached)\n",
2851                cd_getreg(com, CD1400_SRER), com->intr_enable);
2852         printf("service request register:\t0x%02x\n",
2853                cd_inb(iobase, CD1400_SVRR, com->cy_align));
2854         printf("modem status:\t\t\t0x%02x (0x%02x cached)\n",
2855                cd_getreg(com, CD1400_MSVR2), com->prev_modem_status);
2856         printf("rx/tx/mdm interrupt registers:\t0x%02x 0x%02x 0x%02x\n",
2857                cd_inb(iobase, CD1400_RIR, com->cy_align),
2858                cd_inb(iobase, CD1400_TIR, com->cy_align),
2859                cd_inb(iobase, CD1400_MIR, com->cy_align));
2860         printf("\n");
2861         printf("com state:\t\t\t0x%02x\n", com->state);
2862         printf("calls to comstart():\t\t%d (%d useful)\n",
2863                com->start_count, com->start_real);
2864         printf("rx buffer chars free:\t\t%d\n", com->iptr - com->ibuf);
2865         ocount = 0;
2866         if (com->obufs[0].l_queued)
2867                 ocount += com->obufs[0].l_tail - com->obufs[0].l_head;
2868         if (com->obufs[1].l_queued)
2869                 ocount += com->obufs[1].l_tail - com->obufs[1].l_head;
2870         printf("tx buffer chars:\t\t%u\n", ocount);
2871         printf("received chars:\t\t\t%d\n", com->bytes_in);
2872         printf("received exceptions:\t\t%d\n", com->recv_exception);
2873         printf("modem signal deltas:\t\t%d\n", com->mdm);
2874         printf("transmitted chars:\t\t%d\n", com->bytes_out);
2875         printf("\n");
2876         tp = com->tp;
2877         if (tp != NULL) {
2878                 printf("tty state:\t\t\t0x%08x\n", tp->t_state);
2879                 printf(
2880                 "upper layer queue lengths:\t%d raw, %d canon, %d output\n",
2881                        tp->t_rawq.c_cc, tp->t_canq.c_cc, tp->t_outq.c_cc);
2882         } else
2883                 printf("tty state:\t\t\tclosed\n");
2884 }
2885 #endif /* CyDebug */