source: rtems/c/src/libchip/serial/mc68681.c @ 48bfd992

4.104.114.84.95
Last change on this file since 48bfd992 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.
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1/*
2 *  This file contains the termios TTY driver for the Motorola MC68681.
3 *
4 *  This part is available from a number of secondary sources.
5 *  In particular, we know about the following:
6 *
7 *     + Exar 88c681 and 68c681
8 *
9 *  COPYRIGHT (c) 1989-1999.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.OARcorp.com/rtems/license.html.
15 *
16 *  $Id$
17 */
18
19#include <rtems.h>
20#include <rtems/libio.h>
21#include <stdlib.h>
22
23#include <libchip/serial.h>
24#include <libchip/mc68681.h>
25#include "sersupp.h"
26#include "mc68681_p.h"
27
28/*
29 * Flow control is only supported when using interrupts
30 */
31
32console_fns mc68681_fns =
33{
34  libchip_serial_default_probe,   /* deviceProbe */
35  mc68681_open,                   /* deviceFirstOpen */
36  NULL,                           /* deviceLastClose */
37  NULL,                           /* deviceRead */
38  mc68681_write_support_int,      /* deviceWrite */
39  mc68681_initialize_interrupts,  /* deviceInitialize */
40  mc68681_write_polled,           /* deviceWritePolled */
41  mc68681_set_attributes,         /* deviceSetAttributes */
42  TRUE                            /* deviceOutputUsesInterrupts */
43};
44
45console_fns mc68681_fns_polled =
46{
47  libchip_serial_default_probe,        /* deviceProbe */
48  mc68681_open,                        /* deviceFirstOpen */
49  mc68681_close,                       /* deviceLastClose */
50  mc68681_inbyte_nonblocking_polled,   /* deviceRead */
51  mc68681_write_support_polled,        /* deviceWrite */
52  mc68681_init,                        /* deviceInitialize */
53  mc68681_write_polled,                /* deviceWritePolled */
54  mc68681_set_attributes,              /* deviceSetAttributes */
55  FALSE,                               /* deviceOutputUsesInterrupts */
56};
57
58extern void set_vector( rtems_isr_entry, rtems_vector_number, int );
59
60/*
61 *  Console Device Driver Entry Points
62 */
63
64/*
65 *  mc68681_baud_rate
66 *
67 *  This routine returns the proper ACR bit and baud rate field values
68 *  based on the requested baud rate.  The baud rate set to be used
69 *  must be configured by the user.
70 */
71
72MC68681_STATIC int mc68681_baud_rate(
73  int           minor,
74  int           baud,
75  unsigned int *baud_mask_p,
76  unsigned int *acr_bit_p,
77  unsigned int *command
78);
79
80/*
81 *  mc68681_set_attributes
82 *
83 *  This function sets the DUART channel to reflect the requested termios
84 *  port settings.
85 */
86
87MC68681_STATIC int mc68681_set_attributes(
88  int minor,
89  const struct termios *t
90)
91{
92  unsigned32             pMC68681_port;
93  unsigned32             pMC68681;
94  unsigned int           mode1;
95  unsigned int           mode2;
96  unsigned int           baud_mask;
97  unsigned int           acr_bit;
98  unsigned int           cmd;
99  setRegister_f          setReg;
100  rtems_interrupt_level  Irql;
101
102  pMC68681      = Console_Port_Tbl[minor].ulCtrlPort1;
103  pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2;
104  setReg        = Console_Port_Tbl[minor].setRegister;
105
106  /*
107   *  Set the baud rate
108   */
109
110  if (mc68681_baud_rate( minor, t->c_cflag, &baud_mask, &acr_bit, &cmd ) == -1)
111    return -1;
112
113  baud_mask |=  baud_mask << 4;
114  acr_bit   <<= 7;
115
116  /*
117   *  Parity
118   */
119
120  mode1 = 0;
121  mode2 = 0;
122
123  if (t->c_cflag & PARENB) {
124    if (t->c_cflag & PARODD)
125      mode1 |= 0x04;
126    else
127      mode1 |= 0x04;
128  } else {
129   mode1 |= 0x10;
130  }
131
132  /*
133   *  Character Size
134   */
135
136  if (t->c_cflag & CSIZE) {
137    switch (t->c_cflag & CSIZE) {
138      case CS5:  break;
139      case CS6:  mode1 |= 0x01;  break;
140      case CS7:  mode1 |= 0x02;  break;
141      case CS8:  mode1 |= 0x03;  break;
142    }
143  } else {
144    mode1 |= 0x03;       /* default to 9600,8,N,1 */
145  }
146
147  /*
148   *  Stop Bits
149   */
150 
151  if (t->c_cflag & CSTOPB) {
152    mode2 |= 0x07;                      /* 2 stop bits */
153  } else {
154    if ((t->c_cflag & CSIZE) == CS5)    /* CS5 and 2 stop bits not supported */
155      return -1;
156    mode2 |= 0x0F;                      /* 1 stop bit */
157  }
158
159  rtems_interrupt_disable(Irql);
160    (*setReg)( pMC68681, MC68681_AUX_CTRL_REG, acr_bit );
161    (*setReg)( pMC68681_port, MC68681_CLOCK_SELECT, baud_mask );
162    if ( cmd ) {
163      (*setReg)( pMC68681_port, MC68681_COMMAND, cmd );         /* RX */
164      (*setReg)( pMC68681_port, MC68681_COMMAND, cmd | 0x20 );  /* TX */
165    }
166    (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_MR_PTR );
167    (*setReg)( pMC68681_port, MC68681_MODE, mode1 );
168    (*setReg)( pMC68681_port, MC68681_MODE, mode2 );
169  rtems_interrupt_enable(Irql);
170  return 0;
171}
172
173/*
174 *  mc68681_initialize_context
175 *
176 *  This function sets the default values of the per port context structure.
177 */
178
179MC68681_STATIC void mc68681_initialize_context(
180  int               minor,
181  mc68681_context  *pmc68681Context
182)
183{
184  int          port;
185  unsigned int pMC68681;
186  unsigned int pMC68681_port;
187 
188  pMC68681      = Console_Port_Tbl[minor].ulCtrlPort1;
189  pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2;
190
191  pmc68681Context->mate = -1;
192
193  for (port=0 ; port<Console_Port_Count ; port++ ) {
194    if ( Console_Port_Tbl[port].ulCtrlPort1 == pMC68681 &&
195         Console_Port_Tbl[port].ulCtrlPort2 != pMC68681_port ) {
196      pmc68681Context->mate = port;
197      pmc68681Context->imr  = 0;
198      break;
199    }
200  }
201
202}
203
204/*
205 *  mc68681_init
206 *
207 *  This function initializes the DUART to a quiecsent state.
208 */
209
210MC68681_STATIC void mc68681_init(int minor)
211{
212  unsigned32              pMC68681_port;
213  unsigned32              pMC68681;
214  mc68681_context        *pmc68681Context;
215  setRegister_f           setReg;
216  getRegister_f           getReg;
217
218  pmc68681Context = (mc68681_context *) malloc(sizeof(mc68681_context));
219
220  Console_Port_Data[minor].pDeviceContext = (void *)pmc68681Context;
221
222  mc68681_initialize_context( minor, pmc68681Context );
223
224  pMC68681      = Console_Port_Tbl[minor].ulCtrlPort1;
225  pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2;
226  setReg        = Console_Port_Tbl[minor].setRegister;
227  getReg        = Console_Port_Tbl[minor].getRegister;
228
229  /*
230   *  Reset everything and leave this port disabled.
231   */
232
233  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_RX );
234  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_TX );
235  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_ERROR );
236  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_BREAK );
237  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_STOP_BREAK );
238  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_TX );
239  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_RX );
240
241
242  (*setReg)( pMC68681_port, MC68681_MODE_REG_1A, 0x00 );
243  (*setReg)( pMC68681_port, MC68681_MODE_REG_2A, 0x02 );
244
245  /*
246   *  Disable interrupts on RX and TX for this port
247   */
248
249  mc68681_enable_interrupts( minor, MC68681_IMR_DISABLE_ALL );
250}
251
252/*
253 *  mc68681_open
254 *
255 *  This function opens a port for communication.
256 *
257 *  Default state is 9600 baud, 8 bits, No parity, and 1 stop bit.
258 */
259
260MC68681_STATIC int mc68681_open(
261  int      major,
262  int      minor,
263  void    *arg
264)
265{
266  unsigned32             pMC68681;
267  unsigned32             pMC68681_port;
268  unsigned int           baud;
269  unsigned int           acr;
270  unsigned int           vector;
271  unsigned int           command;
272  rtems_interrupt_level  Irql;
273  setRegister_f          setReg;
274
275  pMC68681      = Console_Port_Tbl[minor].ulCtrlPort1;
276  pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2;
277  setReg        = Console_Port_Tbl[minor].setRegister;
278  vector        = Console_Port_Tbl[minor].ulIntVector;
279
280  /* XXX default baud rate should be from configuration table */
281
282  (void) mc68681_baud_rate( minor, B9600, &baud, &acr, &command );
283
284  /*
285   *  Set the DUART channel to a default useable state
286   */
287
288  rtems_interrupt_disable(Irql);
289    (*setReg)( pMC68681, MC68681_AUX_CTRL_REG, acr );
290    (*setReg)( pMC68681_port, MC68681_CLOCK_SELECT, baud );
291    if ( command ) {
292      (*setReg)( pMC68681_port, MC68681_COMMAND, command );         /* RX */
293      (*setReg)( pMC68681_port, MC68681_COMMAND, command | 0x20 );  /* TX */
294    }
295    (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_MR_PTR );
296    (*setReg)( pMC68681_port, MC68681_MODE, 0x13 );
297    (*setReg)( pMC68681_port, MC68681_MODE, 0x07 );
298  rtems_interrupt_enable(Irql);
299
300  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_ENABLE_TX );
301  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_ENABLE_RX );
302
303  (*setReg)( pMC68681, MC68681_INTERRUPT_VECTOR_REG, vector );
304
305  return RTEMS_SUCCESSFUL;
306}
307
308/*
309 *  mc68681_close
310 *
311 *  This function shuts down the requested port.
312 */
313
314MC68681_STATIC int mc68681_close(
315  int      major,
316  int      minor,
317  void    *arg
318)
319{
320  unsigned32      pMC68681;
321  unsigned32      pMC68681_port;
322  setRegister_f   setReg;
323
324  pMC68681      = Console_Port_Tbl[minor].ulCtrlPort1;
325  pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2;
326  setReg        = Console_Port_Tbl[minor].setRegister;
327
328  /*
329   *  Disable interrupts from this channel and then disable it totally.
330   */
331
332#if 0
333  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_TX );
334  (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_DISABLE_RX );
335#endif
336
337  return(RTEMS_SUCCESSFUL);
338}
339
340/*
341 *  mc68681_write_polled
342 *
343 *  This routine polls out the requested character.
344 */
345
346MC68681_STATIC void mc68681_write_polled(
347  int   minor,
348  char  cChar
349)
350{
351  unsigned32              pMC68681_port;
352  unsigned char           ucLineStatus;
353  int                     iTimeout;
354  getRegister_f           getReg;
355  setRegister_f           setReg;
356
357  pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2;
358  getReg        = Console_Port_Tbl[minor].getRegister;
359  setReg        = Console_Port_Tbl[minor].setRegister;
360
361  /*
362   * wait for transmitter holding register to be empty
363   */
364  iTimeout = 1000;
365  ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS);
366  while ((ucLineStatus & (MC68681_TX_READY|MC68681_TX_EMPTY)) == 0) {
367
368    if ((ucLineStatus & 0xF0))
369      (*setReg)( pMC68681_port, MC68681_COMMAND, MC68681_MODE_REG_RESET_ERROR );
370
371    /*
372     * Yield while we wait
373     */
374
375#if 0
376     if(_System_state_Is_up(_System_state_Get())) {
377       rtems_task_wake_after(RTEMS_YIELD_PROCESSOR);
378     }
379#endif
380     ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS);
381     if(!--iTimeout) {
382       break;
383     }
384  }
385
386  /*
387   * transmit character
388   */
389
390  (*setReg)(pMC68681_port, MC68681_TX_BUFFER, cChar);
391}
392
393/*
394 *  mc68681_isr
395 *
396 *  This is the single interrupt entry point which parcels interrupts
397 *  out to the various ports.
398 */
399
400MC68681_STATIC rtems_isr mc68681_isr(
401  rtems_vector_number vector
402)
403{
404  int     minor;
405
406  for(minor=0 ; minor<Console_Port_Count ; minor++) {
407    if(Console_Port_Tbl[minor].ulIntVector == vector &&
408       Console_Port_Tbl[minor].deviceType == SERIAL_MC68681 ) {
409      mc68681_process(minor);
410    }
411  }
412}
413
414/*
415 *  mc68681_initialize_interrupts
416 *
417 *  This routine initializes the console's receive and transmit
418 *  ring buffers and loads the appropriate vectors to handle the interrupts.
419 */
420
421MC68681_STATIC void mc68681_initialize_interrupts(int minor)
422{
423  mc68681_init(minor);
424
425  Console_Port_Data[minor].bActive = FALSE;
426
427  set_vector(mc68681_isr, Console_Port_Tbl[minor].ulIntVector, 1);
428
429  mc68681_enable_interrupts(minor,MC68681_IMR_ENABLE_ALL_EXCEPT_TX);
430}
431
432/*
433 *  mc68681_write_support_int
434 *
435 *  Console Termios output entry point when using interrupt driven output.
436 */
437
438MC68681_STATIC int mc68681_write_support_int(
439  int         minor,
440  const char *buf,
441  int         len
442)
443{
444  unsigned32      Irql;
445  unsigned32      pMC68681_port;
446  setRegister_f   setReg;
447
448  pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2;
449  setReg        = Console_Port_Tbl[minor].setRegister;
450
451  /*
452   *  We are using interrupt driven output and termios only sends us
453   *  one character at a time.
454   */
455
456  if ( !len )
457    return 0;
458
459  /*
460   *  Put the character out and enable interrupts if necessary.
461   */
462
463  rtems_interrupt_disable(Irql);
464    if ( Console_Port_Data[minor].bActive == FALSE ) {
465      Console_Port_Data[minor].bActive = TRUE;
466      mc68681_enable_interrupts(minor, MC68681_IMR_ENABLE_ALL);
467    }
468    (*setReg)(pMC68681_port, MC68681_TX_BUFFER, *buf);
469  rtems_interrupt_enable(Irql);
470
471  return 1;
472}
473
474/*
475 *  mc68681_write_support_polled
476 *
477 *  Console Termios output entry point when using polled output.
478 *
479 */
480
481MC68681_STATIC int mc68681_write_support_polled(
482  int         minor,
483  const char *buf,
484  int         len
485)
486{
487  int nwrite = 0;
488
489  /*
490   * poll each byte in the string out of the port.
491   */
492  while (nwrite < len) {
493    /*
494     * transmit character
495     */
496    mc68681_write_polled(minor, *buf++);
497    nwrite++;
498  }
499
500  /*
501   * return the number of bytes written.
502   */
503  return nwrite;
504}
505
506/*
507 *  mc68681_inbyte_nonblocking_polled
508 *
509 *  Console Termios polling input entry point.
510 */
511
512MC68681_STATIC int mc68681_inbyte_nonblocking_polled(
513  int minor
514)
515{
516  unsigned32           pMC68681_port;
517  unsigned char        ucLineStatus;
518  unsigned char        cChar;
519  getRegister_f        getReg;
520
521  pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2;
522  getReg        = Console_Port_Tbl[minor].getRegister;
523
524  ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS);
525  if(ucLineStatus & MC68681_RX_READY) {
526    cChar = (*getReg)(pMC68681_port, MC68681_RX_BUFFER);
527    return (int)cChar;
528  } else {
529    return -1;
530  }
531}
532
533/*
534 *  mc68681_baud_rate
535 */
536
537MC68681_STATIC int mc68681_baud_rate(
538  int           minor,
539  int           baud,
540  unsigned int *baud_mask_p,
541  unsigned int *acr_bit_p,
542  unsigned int *command
543)
544{
545  unsigned int           baud_mask;
546  unsigned int           acr_bit;
547  int                    status;
548  int                    is_extended;
549  int                    baud_requested;
550  mc68681_baud_table_t  *baud_tbl;
551
552  baud_mask = 0;
553  acr_bit = 0;
554  status = 0;
555
556  if ( !(Console_Port_Tbl[minor].ulDataPort & MC68681_DATA_BAUD_RATE_SET_1) )
557    acr_bit = 1;
558
559  is_extended = 0;
560
561  switch (Console_Port_Tbl[minor].ulDataPort & MC68681_XBRG_MASK) {
562    case MC68681_XBRG_IGNORED:
563      *command = 0x00;
564      break;
565    case MC68681_XBRG_ENABLED:
566      *command = 0x80;
567      is_extended = 1;
568      break;
569    case MC68681_XBRG_DISABLED:
570      *command = 0x90;
571      break;
572  }
573
574  baud_requested = baud & CBAUD;
575  if (!baud_requested)
576    baud_requested = B9600;              /* default to 9600 baud */
577 
578  baud_requested = termios_baud_to_index( baud_requested );
579
580  baud_tbl = (mc68681_baud_table_t *) Console_Port_Tbl[minor].ulClock;
581  if (!baud_tbl)
582    rtems_fatal_error_occurred(RTEMS_INVALID_ADDRESS);
583
584  if ( is_extended )
585    baud_mask = (unsigned int)baud_tbl[ acr_bit + 2 ][ baud_requested ];
586  else
587    baud_mask = baud_tbl[ acr_bit ][ baud_requested ];
588
589  if ( baud_mask == MC68681_BAUD_NOT_VALID )
590    status = -1;
591
592  /*
593   *  upper nibble is receiver and lower nibble is transmitter
594   */
595
596  *baud_mask_p = (baud_mask << 4) | baud_mask;
597  *acr_bit_p   = acr_bit;
598  return status;
599}
600
601/*
602 *  mc68681_process
603 *
604 *  This routine is the per port console interrupt handler.
605 */
606
607MC68681_STATIC void mc68681_process(
608  int  minor
609)
610{
611  unsigned32              pMC68681;
612  unsigned32              pMC68681_port;
613  volatile unsigned8      ucLineStatus;
614  unsigned char           cChar;
615  getRegister_f           getReg;
616  setRegister_f           setReg;
617
618  pMC68681      = Console_Port_Tbl[minor].ulCtrlPort1;
619  pMC68681_port = Console_Port_Tbl[minor].ulCtrlPort2;
620  getReg        = Console_Port_Tbl[minor].getRegister;
621  setReg        = Console_Port_Tbl[minor].setRegister;
622
623  /*
624   * Deal with any received characters
625   */
626  while(TRUE) {
627    ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS);
628    if(!(ucLineStatus & MC68681_RX_READY)) {
629      break;
630    }
631    /*
632     *  If there is a RX error, then dump all the data.
633     */
634    if ( ucLineStatus & MC68681_RX_ERRORS ) {
635      do {
636        cChar = (*getReg)(pMC68681_port, MC68681_RX_BUFFER);
637        ucLineStatus = (*getReg)(pMC68681_port, MC68681_STATUS);
638      } while ( ucLineStatus & MC68681_RX_READY );
639      continue;
640    }
641    cChar = (*getReg)(pMC68681_port, MC68681_RX_BUFFER);
642    rtems_termios_enqueue_raw_characters(
643      Console_Port_Data[minor].termios_data,
644      &cChar,
645      1
646    );
647  }
648
649  /*
650   *  Deal with the transmitter
651   */
652
653  ucLineStatus = (*getReg)(pMC68681, MC68681_INTERRUPT_STATUS_REG);
654  if (pMC68681 != pMC68681_port)
655    ucLineStatus >>= 4;
656
657  if(ucLineStatus & MC68681_IR_TX_READY) {
658    if (rtems_termios_dequeue_characters(
659         Console_Port_Data[minor].termios_data, 1)) {
660      Console_Port_Data[minor].bActive = FALSE;
661      mc68681_enable_interrupts(minor, MC68681_IMR_ENABLE_ALL_EXCEPT_TX);
662    }
663  }
664
665}
666
667/*
668 *  mc68681_build_imr
669 *
670 *  This function returns the value for the interrupt mask register for this
671 *  DUART.  Since this is a shared register, we must look at the other port
672 *  on this chip to determine whether or not it is using interrupts.
673 */
674
675MC68681_STATIC unsigned int mc68681_build_imr(
676  int  minor,
677  int  enable_flag
678)
679{
680  int              mate;
681  int              is_a;
682  unsigned int     mask;
683  unsigned int     mate_mask;
684  unsigned int     pMC68681;
685  unsigned int     pMC68681_port;
686  mc68681_context *pmc68681Context;
687  mc68681_context *mateContext;
688 
689  pMC68681        = Console_Port_Tbl[minor].ulCtrlPort1;
690  pMC68681_port   = Console_Port_Tbl[minor].ulCtrlPort2;
691  pmc68681Context = (mc68681_context *) Console_Port_Data[minor].pDeviceContext;
692  mate            = pmc68681Context->mate;
693
694  mask = 0;
695  mate_mask = 0;
696
697  is_a = (pMC68681 == pMC68681_port);
698 
699  /*
700   *  If there is a mate for this port, get its IMR mask.
701   */
702
703  if ( mate != -1 ) {
704    mateContext = Console_Port_Data[mate].pDeviceContext;
705   
706    if (mateContext)
707      mate_mask = mateContext->imr;
708  }
709
710  /*
711   *  Calculate this port's IMR mask and save it in the context area.
712   */
713
714  if ( Console_Port_Tbl[minor].pDeviceFns->deviceOutputUsesInterrupts )
715    mask = enable_flag;
716
717  pmc68681Context->imr = mask;
718
719  /*
720   *  Now return the full IMR value
721   */
722
723  if (is_a)
724    return (mate_mask << 4) | mask;
725
726  return (mask << 4) | mate_mask;
727}
728
729/*
730 *  mc68681_enable_interrupts
731 *
732 *  This function enables specific interrupt sources on the DUART.
733 */
734
735MC68681_STATIC void mc68681_enable_interrupts(
736  int minor,
737  int imr_mask
738)
739{
740  unsigned32            pMC68681;
741  setRegister_f         setReg;
742
743  pMC68681 = Console_Port_Tbl[minor].ulCtrlPort1;
744  setReg   = Console_Port_Tbl[minor].setRegister;
745
746  /*
747   *  Enable interrupts on RX and TX -- not break
748   */
749
750  (*setReg)(
751     pMC68681,
752     MC68681_INTERRUPT_MASK_REG,
753     mc68681_build_imr(minor, imr_mask)
754  );
755}
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