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/*
2
 *  console.c
3
 *
4
 *  This file contains the MVME167 termios console package. Only asynchronous
5
 *  I/O is supported.
6
 *
7
 *  /dev/tty0 is channel 0, Serial Port 1/Console on the MVME712M.
8
 *  /dev/tty1 is channel 1, Serial Port 2/TTY01 on the MVME712M.
9
 *  /dev/tty2 is channel 2, Serial Port 3 on the MVME712M.
10
 *  /dev/tty3 is channel 3, Serial Port 4 on the MVME712M.
11
 *
12
 *  Normal I/O uses DMA for output, interrupts for input. /dev/console is
13
 *  fixed to be /dev/tty01, Serial Port 2. Very limited support is provided
14
 *  for polled I/O. Polled I/O is intended only for running the RTEMS test
15
 *  suites. In all cases, Serial Port 1/Console is allocated to 167Bug and
16
 *  is the dedicated debugger port. We configure GDB to use 167Bug for
17
 *  debugging. When debugging with GDB or 167Bug, do not open /dev/tty00.
18
 *
19
 *  Modern I/O chips often contain a number of I/O devices that can operate
20
 *  almost independently of each other. Typically, in RTEMS, all devices in
21
 *  an I/O chip are handled by a single device driver, but that need not be
22
 *  always the case. Each device driver must supply six entry points in the
23
 *  Device Driver Table: a device initialization function, as well as an open,
24
 *  close, read, write and a control function. RTEMS assigns a device major
25
 *  number to each device driver. This major device number is the index of the
26
 *  device driver entries in the Device Driver Table, and it used to identify
27
 *  a particular device driver. To distinguish multiple I/O sub-devices within
28
 *  an I/O chip, RTEMS supports device minor numbers. When a I/O device is
29
 *  initialized, the major number is supplied to the initialization function.
30
 *  That function must register each sub-device with a separate name and minor
31
 *  number (as well as the supplied major number). When an application opens a
32
 *  device by name, the corresponding major and minor numbers are returned to
33
 *  the caller to be used in subsequent I/O operations (although these details
34
 *  are typically hidden within the library functions).
35
 *
36
 *  Such a scheme recognizes that the initialization of the individual
37
 *  sub-devices is generally not completely independent. For example, the
38
 *  four serial ports of the CD2401 can be configured almost independently
39
 *  from each other. One port could be configured to operate in asynchronous
40
 *  mode with interrupt-driven I/O, while another port could be configured to
41
 *  operate in HDLC mode with DMA I/O. However, a device reset command will
42
 *  reset all four channels, and the width of DMA transfers and the number of
43
 *  retries following bus errors selected applies to all four channels.
44
 *  Consequently, when initializing one channel, one must be careful not to
45
 *  destroy the configuration of other channels that are already configured.
46
 *
47
 *  One problem with the RTEMS I/O initialization model is that no information
48
 *  other than a device major number is passed to the initialization function.
49
 *  Consequently, the sub-devices must be initialized with some pre-determined
50
 *  configuration. To change the configuration of a sub-device, it is
51
 *  necessary to either rewrite the initialization function, or to make a
52
 *  series of rtems_io_control() calls after initialization. The first
53
 *  approach is not very elegant. The second approach is acceptable if an
54
 *  application is simply changing baud rates, parity or other such
55
 *  asynchronous parameters (as supplied by the termios package). But what if
56
 *  an application requires one channel to run in HDLC or Bisync mode and
57
 *  another in async mode? With a single driver per I/O chip approach, the
58
 *  device driver must support multiple protocols. This is feasible, but it
59
 *  often means that an application that only does asynchronous I/O now links
60
 *  in code for other unused protocols, thus wasting precious ROM space.
61
 *  Worse, it requires that the sub-devices be initialized in some
62
 *  configuration, and that configuration then changed through a series of
63
 *  device driver control calls. There is no standard API in RTEMS to switch
64
 *  a serial line to some synchronous protocol.
65
 *
66
 *  A better approach is to treat each channel as a separate device, each with
67
 *  its own device device driver. The application then supplies its own device
68
 *  driver table with only the required protocols (drivers) on each line. The
69
 *  problem with this approach is that the device drivers are not really
70
 *  independent, given that the I/O sub-devices within a common chip are not
71
 *  independent themselves. Consequently, the related device drivers must
72
 *  share some information. In RTEMS, there is no standard location in which
73
 *  to share information.
74
 *
75
 *  This driver handles all four channels, i.e. it distinguishes the
76
 *  sub-devices using minor device numbers. Only asynchronous I/O is
77
 *  supported. The console is currently fixed to be channel 1 on the CD2401,
78
 *  which corresponds to the TTY01 port (Serial Port 2) on the MVME712M
79
 *  Transition Module.
80
 *
81
 *  The CD2401 does either interrupt-driven or DMA I/O; it does not support
82
 *  polling. In interrupt-driven or DMA I/O modes, interrupts from the CD2401
83
 *  are routed to the MC68040, and the processor generates an interrupt
84
 *  acknowledge cycle directly to the CD2401 to obtain an interrupt vector.
85
 *  The PCCchip2 supports a pseudo-polling mode in which interrupts from the
86
 *  CD2401 are not routed to the MC68040, but can be detected by the processor
87
 *  by reading the appropriate CD2401 registers. In this mode, interrupt
88
 *  acknowledge cycles must be generated to the CD2401 by reading the
89
 *  appropriate PCCchip2 registers.
90
 *
91
 *  Interrupts from the four channels cannot be routed independently; either
92
 *  all channels are used in the pseudo-polling mode, or all channels are used
93
 *  in interrupt-driven/DMA mode. There is no advantage in using the speudo-
94
 *  polling mode. Consenquently, this driver performs DMA input and output.
95
 *  Output is performed directly from the termios raw output buffer, while
96
 *  input is accumulated into a separate buffer.
97
 *
98
 *  THIS MODULE IS NOT RE-ENTRANT! Simultaneous access to a device from
99
 *  multiple tasks is likely to cause significant problems! Concurrency
100
 *  control is implemented in the termios package.
101
 *
102
 *  THE INTERRUPT LEVEL IS SET TO 1 FOR ALL CHANNELS.
103
 *  If the CD2401 is to be used for high speed synchronous serial I/O, the
104
 *  interrupt priority might need to be increased.
105
 *
106
 *  ALL INTERRUPT HANDLERS ARE SHARED.
107
 *  When adding extra device drivers, either rewrite the interrupt handlers
108
 *  to demultiplex the interrupts, or install separate vectors. Common vectors
109
 *  are currently used to catch spurious interrupts. We could already have
110
 *  installed separate vectors for each channel and used the spurious
111
 *  interrupt handler defined in some other BSPs, but handling spurious
112
 *  interrupts from the CD2401 in this device driver allows us to record more
113
 *  information on the source of the interrupts. Furthermore, we have observed
114
 *  the occasional spurious interrupt from channel 0. We definitely do not
115
 *  to call a debugger for those.
116
 *
117
 *  All page references are to the MVME166/MVME167/MVME187 Single Board
118
 *  Computer Programmer's Reference Guide (MVME187PG/D2) with the April
119
 *  1993 supplements/addenda (MVME187PG/D2A1).
120
 *
121
 *  Copyright (c) 1998, National Research Council of Canada
122
 *
123
 *  The license and distribution terms for this file may be
124
 *  found in the file LICENSE in this distribution or at
125
 *  http://www.OARcorp.com/rtems/license.html.
126
 */
127
 
128
#define M167_INIT
129
 
130
#include <stdarg.h>
131
#include <stdio.h>
132
#include <termios.h>
133
#include <bsp.h>                /* Must be before libio.h */
134
#include <rtems/libio.h>
135
 
136
 
137
/* Channel info */
138
/* static */ volatile struct {
139
  void *tty;                    /* Really a struct rtems_termios_tty * */
140
  int len;                      /* Record nb of chars being TX'ed */
141
  const char *buf;              /* Record where DMA is coming from */
142
  rtems_unsigned32 spur_cnt;    /* Nb of spurious ints so far */
143
  rtems_unsigned32 spur_dev;    /* Indo on last spurious int */
144
  rtems_unsigned32 buserr_addr; /* Faulting address */
145
  rtems_unsigned32 buserr_type; /* Reason of bus error during DMA */
146
  rtems_unsigned8  own_buf_A;   /* If true, buffer A belongs to the driver */
147
  rtems_unsigned8  own_buf_B;   /* If true, buffer B belongs to the driver */
148
  rtems_unsigned8  txEmpty;     /* If true, the output FIFO is supposed to be empty */
149
} CD2401_Channel_Info[4];
150
 
151
/*
152
 *  The number of channels already opened. If zero, enable the interrupts. The
153
 *  initial value must be 0. If initialized explicitly, the variable ends up
154
 *  in the .data section. Its value is not re-initialized on system restart.
155
 *  Furthermore, because the variable is changed, the .data section would not
156
 *  be ROMable. We thus leave the variable uninitialized, which causes it to
157
 *  be allocated in the .bss section, and rely on RTEMS to zero the .bss
158
 *  section on every startup.
159
 */
160
rtems_unsigned8 Init_count;
161
 
162
 
163
/* Record previous handlers */
164
rtems_isr_entry Prev_re_isr;        /* Previous rx exception isr */
165
rtems_isr_entry Prev_rx_isr;        /* Previous rx isr */
166
rtems_isr_entry Prev_tx_isr;        /* Previous tx isr */
167
rtems_isr_entry Prev_modem_isr;     /* Previous modem/timer isr */
168
 
169
 
170
/* Define the following symbol to trace the calls to this driver */
171
/* #define CD2401_RECORD_DEBUG_INFO */
172
#include "console-recording.c"
173
 
174
 
175
/* Utility functions */
176
void cd2401_udelay( unsigned long delay );
177
void cd2401_chan_cmd( rtems_unsigned8 channel, rtems_unsigned8 cmd, rtems_unsigned8 wait );
178
rtems_unsigned16 cd2401_bitrate_divisor( rtems_unsigned32 clkrate, rtems_unsigned32* bitrate );
179
void cd2401_initialize( void );
180
void cd2401_interrupts_initialize( rtems_boolean enable );
181
 
182
/* ISRs */
183
rtems_isr cd2401_modem_isr( rtems_vector_number vector );
184
rtems_isr cd2401_re_isr( rtems_vector_number vector );
185
rtems_isr cd2401_rx_isr( rtems_vector_number vector );
186
rtems_isr cd2401_tx_isr( rtems_vector_number vector );
187
 
188
/* Termios callbacks */
189
int cd2401_firstOpen( int major, int minor, void *arg );
190
int cd2401_lastClose( int major, int minor, void *arg );
191
int cd2401_setAttributes( int minor, const struct termios *t );
192
int cd2401_startRemoteTx( int minor );
193
int cd2401_stopRemoteTx( int minor );
194
int cd2401_write( int minor, const char *buf, int len );
195
int cd2401_drainOutput( int minor );
196
int _167Bug_pollRead( int minor );
197
int _167Bug_pollWrite( int minor, const char *buf, int len );
198
 
199
 
200
/*
201
 *  Utility functions.
202
 */
203
 
204
/*
205
 *  Assumes that clock ticks 1 million times per second.
206
 *
207
 *  MAXIMUM DELAY IS ABOUT 20 ms
208
 *
209
 *  Input parameters:
210
 *    delay: Number of microseconds to delay.
211
 *
212
 *  Output parameters: NONE
213
 *
214
 *  Return values: NONE
215
 */
216
 void cd2401_udelay
217
(
218
  unsigned long delay
219
)
220
{
221
  unsigned long i = 20000;  /* In case clock is off */
222
  rtems_interval ticks_per_second, start_ticks, end_ticks, current_ticks;
223
 
224
  rtems_clock_get( RTEMS_CLOCK_GET_TICKS_PER_SECOND, &ticks_per_second );
225
  rtems_clock_get( RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &start_ticks );
226
  end_ticks = start_ticks + delay;
227
 
228
  do {
229
    rtems_clock_get(RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &current_ticks);
230
  } while ( --i && (current_ticks <= end_ticks) );
231
 
232
  CD2401_RECORD_DELAY_INFO(( start_ticks, end_ticks, current_ticks, i ));
233
}
234
 
235
 
236
/*
237
 *  cd2401_chan_cmd
238
 *
239
 *  Sends a CCR command to the specified channel. Waits for any unfinished
240
 *  previous command to complete, then sends the specified command. Optionally
241
 *  wait for the current command to finish before returning.
242
 *
243
 *  Input parameters:
244
 *    channel - CD2401 channel number
245
 *    cmd  - command byte
246
 *    wait - if non-zero, wait for specified command to complete before
247
 *          returning.
248
 *
249
 *  Output parameters: NONE
250
 *
251
 *  Return values: NONE
252
 */
253
void cd2401_chan_cmd(
254
  rtems_unsigned8 channel,
255
  rtems_unsigned8 cmd,
256
  rtems_unsigned8 wait
257
)
258
{
259
  if ( channel < 4 ) {
260
    cd2401->car = channel;      /* Select channel */
261
 
262
    while ( cd2401->ccr != 0 ); /* Wait for completion of any previous command */
263
    cd2401->ccr = cmd;          /* Send command */
264
    if ( wait )
265
      while( cd2401->ccr != 0 );/* Wait for completion */
266
  }
267
  else {
268
    /* This may not be the best error message */
269
    rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER );
270
  }
271
}
272
 
273
 
274
/*
275
 *  cd2401_bitrate_divisor
276
 *
277
 *  Compute the divisor and clock source to use to obtain the desired bitrate.
278
 *
279
 *  Input parameters:
280
 *    clkrate - system clock rate (CLK input frequency)
281
 *    bitrate - the desired bitrate
282
 *
283
 *  Output parameters:
284
 *    bitrate - The actual bitrate achievable, to the nearest bps.
285
 *
286
 *  Return values:
287
 *    Returns divisor in lower byte and clock source in upper byte for the
288
 *    specified bitrate.
289
 */
290
rtems_unsigned16 cd2401_bitrate_divisor(
291
  rtems_unsigned32 clkrate,
292
  rtems_unsigned32* bitrate
293
)
294
{
295
  rtems_unsigned32 divisor;
296
  rtems_unsigned16 clksource;
297
 
298
  divisor = *bitrate << 3;          /* temporary; multiply by 8 for CLK/8 */
299
  divisor = (clkrate + (divisor>>1)) / divisor; /* divisor for clk0 (CLK/8) */
300
 
301
  /*  Use highest speed clock source for best precision - try from clk0 to clk4:  */
302
  for( clksource = 0; clksource < 0x0400 && divisor > 0x100; clksource += 0x0100 )
303
      divisor >>= 2;
304
  divisor--;                        /* adjustment, see specs */
305
  if( divisor < 1 )
306
    divisor = 1;
307
  else if( divisor > 0xFF )
308
    divisor = 0xFF;
309
  *bitrate = clkrate / (1 << ((clksource >> 7)+3)) / (divisor+1);
310
  return( clksource | divisor );
311
}
312
 
313
 
314
/*
315
 *  cd2401_initialize
316
 *
317
 *  Initializes the CD2401 device. Individual channels on the chip are left in
318
 *  their default reset state, and should be subsequently configured.
319
 *
320
 *  Input parameters: NONE
321
 *
322
 *  Output parameters:  NONE
323
 *
324
 *  Return values: NONE
325
 */
326
void cd2401_initialize( void )
327
{
328
  int i;
329
 
330
  for ( i = 3; i >= 0; i-- ) {
331
    CD2401_Channel_Info[i].tty = NULL;
332
    CD2401_Channel_Info[i].len = 0;
333
    CD2401_Channel_Info[i].buf = NULL;
334
    CD2401_Channel_Info[i].spur_cnt = 0;
335
    CD2401_Channel_Info[i].spur_dev = 0;
336
    CD2401_Channel_Info[i].buserr_type = 0;
337
    CD2401_Channel_Info[i].buserr_addr = 0;
338
    CD2401_Channel_Info[i].own_buf_A = TRUE;
339
    CD2401_Channel_Info[i].own_buf_B = TRUE;
340
    CD2401_Channel_Info[i].txEmpty = TRUE;
341
  }
342
 
343
 /*
344
  *  Normally, do a device reset here. If we do it, we will most likely clober
345
  *  the port settings for 167Bug on channel 0. So we just shut up all the
346
  *  ports by disabling their interrupts.
347
  */
348
#if 0
349
  cd2401->gfrcr = 0;            /* So we can detect that device init is done */
350
  cd2401_chan_cmd( 0x10, 0);    /* Reset all */
351
  while(cd2401->gfrcr == 0);    /* Wait for reset all */
352
#endif
353
 
354
  /*
355
   *  The CL-CD2400/2401 manual (part no 542400-003) states on page 87 that
356
   *  the LICR "contains the number of the interrupting channel being served.
357
   *  The channel number is always that of the current acknowledged interrupt."
358
   *  THE USER MUST PROGRAM CHANNEL NUMBER IN LICR! It is not set automatically
359
   *  by the hardware, as suggested by the manual.
360
   *
361
   *  The updated manual (part no 542400-007) has the story strait. The CD2401
362
   *  automatically initializes the LICR to contain the channel number in bits
363
   *  2 and 3. However, these bits are not preserved when the user defined bits
364
   *  are written.
365
   *
366
   *  The same vector number is used for all four channels. Different vector
367
   *  numbers could be programmed for each channel, thus avoiding the need to
368
   *  demultiplex the interrupts in the ISR.
369
   */
370
  for ( i = 0; i < 4; i++ ) {
371
    cd2401->car = i;            /* Select channel */
372
    cd2401->livr = 0x5C;        /* Motorola suggested value p. 3-15 */
373
    cd2401->licr = i << 2;      /* Don't rely on reset value */
374
    cd2401->ier = 0;            /* Disable all interrupts */
375
  }
376
 
377
  /*
378
   *  The content of the CD2401 xpilr registers must match the A7-A0 addresses
379
   *  generated by the PCCchip2 during interrupt acknowledge cycles in order
380
   *  for the CD2401 to recognize the IACK cycle and clear its interrupt
381
   *  request.
382
   */
383
  cd2401->mpilr = 0x01;         /* Match pccchip2->modem_piack p. 3-27 */
384
  cd2401->tpilr = 0x02;         /* Match pccchip2->tx_piack p. 3-28 */
385
  cd2401->rpilr = 0x03;         /* Match pccchip2->rx_piack p. 3-29 */
386
 
387
  /* Global CD2401 registers */
388
  cd2401->dmr = 0;              /* 16-bit DMA transfers when possible */
389
  cd2401->bercnt = 0;           /* Do not retry DMA upon bus errors */
390
 
391
  /*
392
   *  Setup timer prescaler period, which clocks timers 1 and 2 (or rx timeout
393
   *  and tx delay). The prescaler is clocked by the system clock) / 2048. The
394
   *  register must be in the range 0x0A..0xFF, ie. a rescaler period range of
395
   *  about 1ms..26ms for a nominal system clock rate  of 20MHz.
396
   */
397
  cd2401->tpr  = 0x0A;          /* Same value as 167Bug */
398
}
399
 
400
 
401
/*
402
 *  cd2401_interrupts_initialize
403
 *
404
 *  This routine enables or disables the CD2401 interrupts to the MC68040.
405
 *  Interrupts cannot be enabled/disabled on a per-channel basis.
406
 *
407
 *  Input parameters:
408
 *    enable - if true, enable the interrupts, else disable them.
409
 *
410
 *  Output parameters:  NONE
411
 *
412
 *  Return values: NONE
413
 *
414
 *  THE FIRST CD2401 CHANNEL OPENED SHOULD ENABLE INTERRUPTS.
415
 *  THE LAST CD2401 CHANNEL CLOSED SHOULD DISABLE INTERRUPTS.
416
 */
417
void cd2401_interrupts_initialize(
418
  rtems_boolean enable
419
)
420
{
421
  if ( enable ) {
422
   /*
423
    *  Enable interrupts from the CD2401 in the PCCchip2.
424
    *  During DMA transfers, the MC68040 supplies dirty data during read cycles
425
    *  from the CD2401 and leaves the data dirty in its data cache if there is
426
    *  a cache hit. The MC68040 updates the data cache during write cycles from
427
    *  the CD2401 if there is a cache hit.
428
    */
429
    pccchip2->SCC_error = 0x01;
430
    pccchip2->SCC_modem_int_ctl = 0x10 | CD2401_INT_LEVEL;
431
    pccchip2->SCC_tx_int_ctl = 0x10 | CD2401_INT_LEVEL;
432
    pccchip2->SCC_rx_int_ctl = 0x50 | CD2401_INT_LEVEL;
433
 
434
    pccchip2->gen_control |= 0x02;      /* Enable pccchip2 interrupts */
435
  }
436
  else {
437
    /* Disable interrupts */
438
    pccchip2->SCC_modem_int_ctl &= 0xEF;
439
    pccchip2->SCC_tx_int_ctl &= 0xEF;
440
    pccchip2->SCC_rx_int_ctl &= 0xEF;
441
  }
442
}
443
 
444
 
445
/* ISRs */
446
 
447
/*
448
 *  cd2401_modem_isr
449
 *
450
 *  Modem/timer interrupt (group 1) from CD2401. These are not used, and not
451
 *  expected. Record as spurious and clear.
452
 *
453
 *  Input parameters:
454
 *    vector - vector number
455
 *
456
 *  Output parameters: NONE
457
 *
458
 *  Return values: NONE
459
 */
460
rtems_isr cd2401_modem_isr(
461
  rtems_vector_number vector
462
)
463
{
464
  rtems_unsigned8 ch;
465
 
466
  /* Get interrupting channel ID */
467
  ch = cd2401->licr >> 2;
468
 
469
  /* Record interrupt info for debugging */
470
  CD2401_Channel_Info[ch].spur_dev =
471
      (vector << 24) | (cd2401->stk << 16) | (cd2401->mir << 8) | cd2401->misr;
472
  CD2401_Channel_Info[ch].spur_cnt++;
473
 
474
  cd2401->meoir = 0;            /* EOI */
475
  CD2401_RECORD_MODEM_ISR_SPURIOUS_INFO(( ch,
476
                                          CD2401_Channel_Info[ch].spur_dev,
477
                                          CD2401_Channel_Info[ch].spur_cnt ));
478
}
479
 
480
 
481
/*
482
 *  cd2401_re_isr
483
 *
484
 *  RX exception interrupt (group 3, receiver exception) from CD2401. These are
485
 *  not used, and not expected. Record as spurious and clear.
486
 *
487
 *  FIX THIS ISR TO DETECT BREAK CONDITIONS AND RAISE SIGINT
488
 *
489
 *  Input parameters:
490
 *    vector - vector number
491
 *
492
 *  Output parameters: NONE
493
 *
494
 *  Return values: NONE
495
 */
496
rtems_isr cd2401_re_isr(
497
  rtems_vector_number vector
498
)
499
{
500
  rtems_unsigned8 ch;
501
 
502
  /* Get interrupting channel ID */
503
  ch = cd2401->licr >> 2;
504
 
505
  /* Record interrupt info for debugging */
506
  CD2401_Channel_Info[ch].spur_dev =
507
      (vector << 24) | (cd2401->stk << 16) | (cd2401->rir << 8) | cd2401->u5.b.risrl;
508
  CD2401_Channel_Info[ch].spur_cnt++;
509
 
510
  if ( cd2401->u5.b.risrl & 0x80 )  /* Timeout interrupt? */
511
    cd2401->ier &= 0xDF;            /* Disable rx timeout interrupt */
512
  cd2401->reoir = 0x08;             /* EOI; exception char not read */
513
  CD2401_RECORD_RE_ISR_SPURIOUS_INFO(( ch,
514
                                       CD2401_Channel_Info[ch].spur_dev,
515
                                       CD2401_Channel_Info[ch].spur_cnt ));
516
}
517
 
518
 
519
/*
520
 *  cd2401_rx_isr
521
 *
522
 *  RX interrupt (group 3, receiver data) from CD2401.
523
 *
524
 *  Input parameters:
525
 *     vector - vector number
526
 *
527
 *  Output parameters: NONE
528
 *
529
 *  Return values: NONE
530
 */
531
rtems_isr cd2401_rx_isr(
532
  rtems_vector_number vector
533
)
534
{
535
  char c;
536
  rtems_unsigned8 ch, status, nchars, i, total;
537
  char buffer[256];
538
 
539
  status = cd2401->u5.b.risrl;
540
  ch = cd2401->licr >> 2;
541
 
542
  /* Has this channel been initialized or is it a condition we ignore? */
543
  if ( CD2401_Channel_Info[ch].tty && !status ) {
544
    /* Normal Rx Int, read chars, enqueue them, and issue EOI */
545
    total = nchars = cd2401->rfoc;  /* Nb of chars to retrieve from rx FIFO */
546
    i = 0;
547
    while ( nchars-- > 0 ) {
548
      c = (char)cd2401->dr;         /* Next char in rx FIFO */
549
      rtems_termios_enqueue_raw_characters( CD2401_Channel_Info[ch].tty ,&c, 1 );
550
      buffer[i++] = c;
551
    }
552
    cd2401->reoir = 0;              /* EOI */
553
    CD2401_RECORD_RX_ISR_INFO(( ch, total, buffer ));
554
  } else {
555
    /* No, record as spurious interrupt */
556
    CD2401_Channel_Info[ch].spur_dev =
557
        (vector << 24) | (cd2401->stk << 16) | (cd2401->rir << 8) | cd2401->u5.b.risrl;
558
    CD2401_Channel_Info[ch].spur_cnt++;
559
    cd2401->reoir = 0x04;           /* EOI - character not read */
560
    CD2401_RECORD_RX_ISR_SPURIOUS_INFO(( ch, status,
561
                                         CD2401_Channel_Info[ch].spur_dev,
562
                                         CD2401_Channel_Info[ch].spur_cnt ));
563
  }
564
}
565
 
566
 
567
/*
568
 *  cd2401_tx_isr
569
 *
570
 *  TX interrupt (group 2) from CD2401.
571
 *
572
 *  Input parameters:
573
 *    vector - vector number
574
 *
575
 *  Output parameters: NONE
576
 *
577
 *  Return values: NONE
578
 */
579
rtems_isr cd2401_tx_isr(
580
  rtems_vector_number vector
581
)
582
{
583
  rtems_unsigned8 ch, status, buserr, initial_ier, final_ier;
584
 
585
  status = cd2401->tisr;
586
  ch = cd2401->licr >> 2;
587
  initial_ier = cd2401->ier;
588
 
589
  /* Has this channel been initialized? */
590
  if ( !CD2401_Channel_Info[ch].tty ) {
591
    /* No, record as spurious interrupt */
592
    CD2401_Channel_Info[ch].spur_dev =
593
        (vector << 24) | (cd2401->stk << 16) | (cd2401->tir << 8) | cd2401->tisr;
594
    CD2401_Channel_Info[ch].spur_cnt++;
595
    final_ier = cd2401->ier &= 0xFC;/* Shut up, whoever you are */
596
    cd2401->teoir = 0x88;           /* EOI - Terminate buffer and no transfer */
597
    CD2401_RECORD_TX_ISR_SPURIOUS_INFO(( ch, status, initial_ier, final_ier,
598
                                         CD2401_Channel_Info[ch].spur_dev,
599
                                         CD2401_Channel_Info[ch].spur_cnt ));
600
    return;
601
  }
602
 
603
  if ( status & 0x80 ) {
604
    /*
605
     *  Bus error occurred during DMA transfer. For now, just record.
606
     *  Get reason for DMA bus error and clear the report for the next occurrence
607
     */
608
    buserr = pccchip2->SCC_error;
609
    pccchip2->SCC_error = 0x01;
610
    CD2401_Channel_Info[ch].buserr_type =
611
         (vector << 24) | (buserr << 16) | (cd2401->tir << 8) | cd2401->tisr;
612
    CD2401_Channel_Info[ch].buserr_addr =
613
        (((rtems_unsigned32)cd2401->tcbadru) << 16) | cd2401->tcbadrl;
614
 
615
    cd2401->teoir = 0x80;           /* EOI - terminate bad buffer */
616
    CD2401_RECORD_TX_ISR_BUSERR_INFO(( ch, status, initial_ier, buserr,
617
                                       CD2401_Channel_Info[ch].buserr_type,
618
                                       CD2401_Channel_Info[ch].buserr_addr ));
619
    return;
620
  }
621
 
622
  if ( status & 0x20 ) {
623
    /* DMA done -- Turn off TxD int, turn on TxMpty */
624
    final_ier = cd2401->ier = (cd2401->ier & 0xFE) | 0x02;
625
    if( status & 0x08 ) {
626
      /* Transmit buffer B was released */
627
      CD2401_Channel_Info[ch].own_buf_B = TRUE;
628
    }
629
    else {
630
      /* Transmit buffer A was released */
631
      CD2401_Channel_Info[ch].own_buf_A = TRUE;
632
    }
633
    CD2401_RECORD_TX_ISR_INFO(( ch, status, initial_ier, final_ier,
634
                                CD2401_Channel_Info[ch].txEmpty ));
635
 
636
    /* This call can result in a call to cd2401_write() */
637
    rtems_termios_dequeue_characters (
638
        CD2401_Channel_Info[ch].tty,
639
        CD2401_Channel_Info[ch].len );
640
    cd2401->teoir = 0x08;           /* EOI - no data transfered */
641
  }
642
  else if ( status & 0x02 ) {
643
    /* TxEmpty */
644
    CD2401_Channel_Info[ch].txEmpty = TRUE;
645
    final_ier = cd2401->ier &= 0xFD;/* Shut up the interrupts */
646
    cd2401->teoir = 0x08;           /* EOI - no data transfered */
647
    CD2401_RECORD_TX_ISR_INFO(( ch, status, initial_ier, final_ier,
648
                                CD2401_Channel_Info[ch].txEmpty ));
649
  }
650
  else {
651
    /* Why did we get a Tx interrupt? */
652
    CD2401_Channel_Info[ch].spur_dev =
653
        (vector << 24) | (cd2401->stk << 16) | (cd2401->tir << 8) | cd2401->tisr;
654
    CD2401_Channel_Info[ch].spur_cnt++;
655
    cd2401->teoir = 0x08;           /* EOI - no data transfered */
656
    CD2401_RECORD_TX_ISR_SPURIOUS_INFO(( ch, status, initial_ier, 0xFF,
657
                                         CD2401_Channel_Info[ch].spur_dev,
658
                                         CD2401_Channel_Info[ch].spur_cnt ));
659
  }
660
}
661
 
662
 
663
/*
664
 *  termios callbacks
665
 */
666
 
667
/*
668
 *  cd2401_firstOpen
669
 *
670
 *  This is the first time that this minor device (channel) is opened.
671
 *  Complete the asynchronous initialization.
672
 *
673
 *  Input parameters:
674
 *    major - device major number
675
 *    minor - channel number
676
 *    arg - pointer to a struct rtems_libio_open_close_args_t
677
 *
678
 *  Output parameters: NONE
679
 *
680
 *  Return value: IGNORED
681
 */
682
int cd2401_firstOpen(
683
  int major,
684
  int minor,
685
  void *arg
686
)
687
{
688
  rtems_libio_open_close_args_t *args = arg;
689
  rtems_libio_ioctl_args_t newarg;
690
  struct termios termios;
691
  rtems_status_code sc;
692
  rtems_interrupt_level level;
693
 
694
  rtems_interrupt_disable (level);
695
 
696
  /*
697
   * Set up the line with the specified parameters. The difficulty is that
698
   * the line parameters are stored in the struct termios field of a
699
   * struct rtems_termios_tty that is not defined in a public header file.
700
   * Therefore, we do not have direct access to the termios passed in with
701
   * arg. So we make a rtems_termios_ioctl() call to get a pointer to the
702
   * termios structure.
703
   *
704
   * THIS KLUDGE MAY BREAK IN THE FUTURE!
705
   *
706
   * We could have made a tcgetattr() call if we had our fd.
707
   */
708
  newarg.iop = args->iop;
709
  newarg.command = RTEMS_IO_GET_ATTRIBUTES;
710
  newarg.buffer = &termios;
711
  sc = rtems_termios_ioctl (&newarg);
712
  if (sc != RTEMS_SUCCESSFUL)
713
    rtems_fatal_error_occurred (sc);
714
 
715
  /*
716
   *  Turn off hardware flow control. It is a pain with 3-wire cables.
717
   *  The rtems_termios_ioctl() call below results in a call to
718
   *  cd2401_setAttributes to initialize the line. The caller will "wait"
719
   *  on the ttyMutex that it already owns; this is safe in RTEMS.
720
   */
721
  termios.c_cflag |= CLOCAL;    /* Ignore modem status lines */
722
  newarg.command = RTEMS_IO_SET_ATTRIBUTES;
723
  sc = rtems_termios_ioctl (&newarg);
724
  if (sc != RTEMS_SUCCESSFUL)
725
    rtems_fatal_error_occurred (sc);
726
 
727
  /* Mark that the channel as initialized */
728
  CD2401_Channel_Info[minor].tty = args->iop->data1;
729
 
730
  /* If the first of the four channels to open, set up the interrupts */
731
  if ( !Init_count++ ) {
732
    /* Install the interrupt handlers */
733
    Prev_re_isr    = (rtems_isr_entry) set_vector( cd2401_re_isr,    0x5C, 1 );
734
    Prev_modem_isr = (rtems_isr_entry) set_vector( cd2401_modem_isr, 0x5D, 1 );
735
    Prev_tx_isr    = (rtems_isr_entry) set_vector( cd2401_tx_isr,    0x5E, 1 );
736
    Prev_rx_isr    = (rtems_isr_entry) set_vector( cd2401_rx_isr,    0x5F, 1 );
737
 
738
    cd2401_interrupts_initialize( TRUE );
739
  }
740
 
741
  CD2401_RECORD_FIRST_OPEN_INFO(( minor, Init_count ));
742
 
743
  rtems_interrupt_enable (level);
744
 
745
  /* Return something */
746
  return RTEMS_SUCCESSFUL;
747
}
748
 
749
 
750
/*
751
 * cd2401_lastClose
752
 *
753
 *  There are no more opened file descriptors to this device. Close it down.
754
 *
755
 *  Input parameters:
756
 *    major - device major number
757
 *    minor - channel number
758
 *    arg - pointer to a struct rtems_libio_open_close_args_t
759
 */
760
int cd2401_lastClose(
761
  int major,
762
  int minor,
763
  void *arg
764
)
765
{
766
  rtems_interrupt_level level;
767
 
768
  rtems_interrupt_disable (level);
769
 
770
  /* Mark that the channel is no longer is use */
771
  CD2401_Channel_Info[minor].tty = NULL;
772
 
773
  /* If the last of the four channels to close, disable the interrupts */
774
  if ( !--Init_count ) {
775
    cd2401_interrupts_initialize( FALSE );
776
 
777
    /* De-install the interrupt handlers */
778
    set_vector( Prev_re_isr,    0x5C, 1 );
779
    set_vector( Prev_modem_isr, 0x5D, 1 );
780
    set_vector( Prev_tx_isr,    0x5E, 1 );
781
    set_vector( Prev_rx_isr,    0x5F, 1 );
782
  }
783
 
784
  CD2401_RECORD_LAST_CLOSE_INFO(( minor, Init_count ));
785
 
786
  rtems_interrupt_enable (level);
787
 
788
  /* return something */
789
  return RTEMS_SUCCESSFUL;
790
}
791
 
792
 
793
/*
794
 *  cd2401_setAttributes
795
 *
796
 *  Set up the selected channel of the CD2401 chip for doing asynchronous
797
 *  I/O with DMA.
798
 *
799
 *  The chip must already have been initialized by cd2401_initialize().
800
 *
801
 *  This code was written for clarity. The code space it occupies could be
802
 *  reduced. The code could also be compiled with aggressive optimization
803
 *  turned on.
804
 *
805
 *  Input parameters:
806
 *    minor - the selected channel
807
 *    t - the termios parameters
808
 *
809
 *  Output parameters: NONE
810
 *
811
 *  Return value: IGNORED
812
 */
813
int cd2401_setAttributes(
814
  int minor,
815
  const struct termios *t
816
)
817
{
818
  rtems_unsigned8 csize, cstopb, parodd, parenb, ignpar, inpck;
819
  rtems_unsigned8 hw_flow_ctl, sw_flow_ctl, extra_flow_ctl;
820
  rtems_unsigned8 icrnl, igncr, inlcr, brkint, ignbrk, parmrk, istrip;
821
  rtems_unsigned8 need_reinitialization = FALSE;
822
  rtems_unsigned8 read_enabled;
823
  rtems_unsigned16 tx_period, rx_period;
824
  rtems_unsigned32 out_baud, in_baud;
825
  rtems_interrupt_level level;
826
 
827
  /* Determine what the line parameters should be */
828
 
829
  /* Output baud rate */
830
  switch ( cfgetospeed (t) ) {
831
    default:      out_baud = 9600;    break;
832
    case B50:     out_baud = 50;      break;
833
    case B75:     out_baud = 75;      break;
834
    case B110:    out_baud = 110;     break;
835
    case B134:    out_baud = 134;     break;
836
    case B150:    out_baud = 150;     break;
837
    case B200:    out_baud = 200;     break;
838
    case B300:    out_baud = 300;     break;
839
    case B600:    out_baud = 600;     break;
840
    case B1200:   out_baud = 1200;    break;
841
    case B1800:   out_baud = 1800;    break;
842
    case B2400:   out_baud = 2400;    break;
843
    case B4800:   out_baud = 4800;    break;
844
    case B9600:   out_baud = 9600;    break;
845
    case B19200:  out_baud = 19200;   break;
846
    case B38400:  out_baud = 38400;   break;
847
    case B57600:  out_baud = 57600;   break;
848
    case B115200: out_baud = 115200;  break;
849
    case B230400: out_baud = 230400;  break;
850
    case B460800: out_baud = 460800;  break;
851
 }
852
 
853
  /* Input baud rate */
854
  switch ( cfgetispeed (t) ) {
855
    default:      in_baud = out_baud; break;
856
    case B50:     in_baud = 50;       break;
857
    case B75:     in_baud = 75;       break;
858
    case B110:    in_baud = 110;      break;
859
    case B134:    in_baud = 134;      break;
860
    case B150:    in_baud = 150;      break;
861
    case B200:    in_baud = 200;      break;
862
    case B300:    in_baud = 300;      break;
863
    case B600:    in_baud = 600;      break;
864
    case B1200:   in_baud = 1200;     break;
865
    case B1800:   in_baud = 1800;     break;
866
    case B2400:   in_baud = 2400;     break;
867
    case B4800:   in_baud = 4800;     break;
868
    case B9600:   in_baud = 9600;     break;
869
    case B19200:  in_baud = 19200;    break;
870
    case B38400:  in_baud = 38400;    break;
871
    case B57600:  in_baud = 57600;    break;
872
    case B115200: in_baud = 115200;   break;
873
    case B230400: in_baud = 230400;   break;
874
    case B460800: in_baud = 460800;   break;
875
  }
876
 
877
  /* Number of bits per char */
878
  switch ( t->c_cflag & CSIZE ) {
879
    case CS5:     csize = 0x04;       break;
880
    case CS6:     csize = 0x05;       break;
881
    case CS7:     csize = 0x06;       break;
882
    case CS8:     csize = 0x07;       break;
883
  }
884
 
885
  /* Parity */
886
  if ( t->c_cflag & PARODD )
887
    parodd = 0x80;              /* Odd parity */
888
  else
889
    parodd = 0;
890
 
891
  if ( t->c_cflag & PARENB )
892
    parenb = 0x40;              /* Parity enabled on Tx and Rx */
893
  else
894
    parenb = 0x00;              /* No parity on Tx and Rx */
895
 
896
  /* CD2401 IGNPAR and INPCK bits are inverted wrt POSIX standard? */
897
  if ( t->c_iflag & INPCK )
898
    ignpar = 0;                 /* Check parity on input */
899
  else
900
    ignpar = 0x10;              /* Do not check parity on input */
901
  if ( t->c_iflag & IGNPAR ) {
902
    inpck = 0x03;               /* Discard error character */
903
    parmrk = 0;
904
  } else {
905
    if ( t->c_iflag & PARMRK ) {
906
      inpck = 0x01;             /* Translate to 0xFF 0x00 <char> */
907
      parmrk = 0x04;
908
    } else {
909
      inpck = 0x01;             /* Translate to 0x00 */
910
      parmrk = 0;
911
    }
912
  }
913
 
914
  /* Stop bits */
915
  if ( t->c_cflag & CSTOPB )
916
    cstopb = 0x04;              /* Two stop bits */
917
  else
918
    cstopb = 0x02;              /* One stop bit */
919
 
920
  /* Modem flow control */
921
  if ( t->c_cflag & CLOCAL )
922
    hw_flow_ctl = 0x04;         /* Always assert RTS before Tx */
923
  else
924
    hw_flow_ctl = 0x07;         /* Always assert RTS before Tx,
925
                                   wait for CTS and DSR */
926
 
927
  /* XON/XOFF Tx flow control */
928
  if ( t->c_iflag & IXON ) {
929
    sw_flow_ctl = 0x40;         /* Tx in-band flow ctl enabled, wait for XON */
930
    extra_flow_ctl = 0x30;      /* Eat XON/XOFF, XON/XOFF in SCHR1, SCHR2 */
931
  }
932
  else {
933
    sw_flow_ctl = 0;            /* Tx in-band flow ctl disabled */
934
    extra_flow_ctl = 0;         /* Pass on XON/XOFF */
935
  }
936
 
937
  /* CL/LF translation */
938
  if ( t->c_iflag & ICRNL )
939
    icrnl = 0x40;               /* Map CR to NL on input */
940
  else
941
    icrnl = 0;                  /* Pass on CR */
942
  if ( t->c_iflag & INLCR )
943
    inlcr = 0x20;               /* Map NL to CR on input */
944
  else
945
    inlcr = 0;                  /* Pass on NL */
946
  if ( t->c_iflag & IGNCR )
947
    igncr = 0x80;               /* CR discarded on input */
948
  else
949
    igncr = 0;
950
 
951
  /* Break handling */
952
  if ( t->c_iflag & IGNBRK ) {
953
    ignbrk = 0x10;              /* Ignore break on input */
954
    brkint = 0x08;
955
  } else {
956
    if ( t->c_iflag & BRKINT ) {
957
      ignbrk = 0;               /* Generate SIGINT (interrupt ) */
958
      brkint = 0;
959
    } else {
960
      ignbrk = 0;               /* Convert to 0x00 */
961
      brkint = 0x08;
962
    }
963
  }
964
 
965
  /* Stripping */
966
  if ( t->c_iflag & ISTRIP )
967
    istrip = 0x80;              /* Strip to 7 bits */
968
  else
969
    istrip = 0;                 /* Leave as 8 bits */
970
 
971
  rx_period = cd2401_bitrate_divisor( 20000000Ul, &in_baud );
972
  tx_period = cd2401_bitrate_divisor( 20000000Ul, &out_baud );
973
 
974
  /*
975
   *  If this is the first time that the line characteristics are set up, then
976
   *  the device must be re-initialized.
977
   *  Also check if we need to change anything. It is preferable to not touch
978
   *  the device if nothing changes. As soon as we touch it, it tends to
979
   *  glitch. If anything changes, we reprogram all registers. This is
980
   *  harmless.
981
   */
982
  if ( ( CD2401_Channel_Info[minor].tty == 0 ) ||
983
       ( cd2401->cor1 != (parodd | parenb | ignpar | csize) ) ||
984
       ( cd2401->cor2 != (sw_flow_ctl | hw_flow_ctl) ) ||
985
       ( cd2401->cor3 != (extra_flow_ctl | cstopb) )  ||
986
       ( cd2401->cor6 != (igncr | icrnl | inlcr | ignbrk | brkint | parmrk | inpck) ) ||
987
       ( cd2401->cor7 != istrip ) ||
988
       ( cd2401->u1.async.schr1 != t->c_cc[VSTART] ) ||
989
       ( cd2401->u1.async.schr2 != t->c_cc[VSTOP] ) ||
990
       ( cd2401->rbpr != (unsigned char)rx_period ) ||
991
       ( cd2401->rcor != (unsigned char)(rx_period >> 8) ) ||
992
       ( cd2401->tbpr != (unsigned char)tx_period ) ||
993
       ( cd2401->tcor != ( (tx_period >> 3) & 0xE0 ) ) )
994
    need_reinitialization = TRUE;
995
 
996
  /* Write to the ports */
997
  rtems_interrupt_disable (level);
998
 
999
  cd2401->car = minor;          /* Select channel */
1000
  read_enabled = cd2401->csr & 0x80 ? TRUE : FALSE;
1001
 
1002
  if ( (t->c_cflag & CREAD ? TRUE : FALSE ) != read_enabled ) {
1003
    /* Read enable status is changing */
1004
    need_reinitialization = TRUE;
1005
  }
1006
 
1007
  if ( need_reinitialization ) {
1008
    /*
1009
     *  Could not find a way to test whether the CD2401 was done transmitting.
1010
     *  The TxEmpty interrupt does not seem to indicate that the FIFO is empty
1011
     *  in DMA mode. So, just wait a while for output to drain. May not be
1012
     *  enough, but it will have to do (should be long enough for 1 char at
1013
     *  9600 bsp)...
1014
     */
1015
    cd2401_udelay( 2000L );
1016
 
1017
    /* Clear channel */
1018
    cd2401_chan_cmd (minor, 0x40, 1);
1019
 
1020
    cd2401->car = minor;        /* Select channel */
1021
    cd2401->cmr = 0x42;         /* Interrupt Rx, DMA Tx, async mode */
1022
    cd2401->cor1 = parodd | parenb | ignpar | csize;
1023
    cd2401->cor2 = sw_flow_ctl | hw_flow_ctl;
1024
    cd2401->cor3 = extra_flow_ctl | cstopb;
1025
    cd2401->cor4 = 0x0A;        /* No DSR/DCD/CTS detect; FIFO threshold of 10 */
1026
    cd2401->cor5 = 0x0A;        /* No DSR/DCD/CTS detect; DTR threshold of 10 */
1027
    cd2401->cor6 = igncr | icrnl | inlcr | ignbrk | brkint | parmrk | inpck;
1028
    cd2401->cor7 = istrip;      /* No LNext; ignore XON/XOFF if frame error; no tx translations */
1029
    /* Special char 1: XON character */
1030
    cd2401->u1.async.schr1 = t->c_cc[VSTART];
1031
    /* special char 2: XOFF character */
1032
    cd2401->u1.async.schr2 = t->c_cc[VSTOP];
1033
 
1034
    /*
1035
     *  Special chars 3 and 4, char range, LNext, RFAR[1..4] and CRC
1036
     *  are unused, left as is.
1037
     */
1038
 
1039
    /* Set baudrates for receiver and transmitter */
1040
    cd2401->rbpr = (unsigned char)rx_period;
1041
    cd2401->rcor = (unsigned char)(rx_period >> 8); /* no DPLL */
1042
    cd2401->tbpr = (unsigned char)tx_period;
1043
    cd2401->tcor = (tx_period >> 3) & 0xE0;         /* no x1 ext clk, no loopback */
1044
 
1045
    /* Timeout for 4 chars at 9600, 8 bits per char, 1 stop bit */
1046
    cd2401->u2.w.rtpr  = 0x04;  /* NEED TO LOOK AT THIS LINE! */
1047
 
1048
    if ( t->c_cflag & CREAD ) {
1049
      /* Re-initialize channel, enable rx and tx */
1050
      cd2401_chan_cmd (minor, 0x2A, 1);
1051
      /* Enable rx data ints */
1052
      cd2401->ier = 0x08;
1053
    } else {
1054
      /* Re-initialize channel, enable tx, disable rx */
1055
      cd2401_chan_cmd (minor, 0x29, 1);
1056
    }
1057
  }
1058
 
1059
  CD2401_RECORD_SET_ATTRIBUTES_INFO(( minor, need_reinitialization, csize,
1060
                                      cstopb, parodd, parenb, ignpar, inpck,
1061
                                      hw_flow_ctl, sw_flow_ctl, extra_flow_ctl,
1062
                                      icrnl, igncr, inlcr, brkint, ignbrk,
1063
                                      parmrk, istrip, tx_period, rx_period,
1064
                                      out_baud, in_baud ));
1065
 
1066
  rtems_interrupt_enable (level);
1067
 
1068
  /*
1069
   *  Looks like the CD2401 needs time to settle after initialization. Give it
1070
   *  10 ms. I don't really believe it, but if output resumes to quickly after
1071
   *  this call, the first few characters are not right.
1072
   */
1073
  if ( need_reinitialization )
1074
    cd2401_udelay( 10000L );
1075
 
1076
  /* Return something */
1077
  return RTEMS_SUCCESSFUL;
1078
}
1079
 
1080
 
1081
/*
1082
 *  cd2401_startRemoreTx
1083
 *
1084
 *  Defined as a callback, but it would appear that it is never called. The
1085
 *  POSIX standard states that when the tcflow() function is called with the
1086
 *  TCION action, the system wall transmit a START character. Presumably,
1087
 *  tcflow() is called internally when IXOFF is set in the termios c_iflag
1088
 *  field when the input buffer can accomodate enough characters. It should
1089
 *  probably be called from fillBufferQueue(). Clearly, the function is also
1090
 *  explicitly callable by user code. The action is clearly to send the START
1091
 *  character, regardless of whether START/STOP flow control is in effect.
1092
 *
1093
 *  Input parameters:
1094
 *    minor - selected channel
1095
 *
1096
 *  Output parameters: NONE
1097
 *
1098
 *  Return value: IGNORED
1099
 *
1100
 *  PROPER START CHARACTER MUST BE PROGRAMMED IN SCHR1.
1101
 */
1102
int cd2401_startRemoteTx(
1103
  int minor
1104
)
1105
{
1106
  rtems_interrupt_level level;
1107
 
1108
  rtems_interrupt_disable (level);
1109
 
1110
  cd2401->car = minor;              /* Select channel */
1111
  cd2401->stcr = 0x01;              /* Send SCHR1 ahead of chars in FIFO */
1112
 
1113
  CD2401_RECORD_START_REMOTE_TX_INFO(( minor ));
1114
 
1115
  rtems_interrupt_enable (level);
1116
 
1117
  /* Return something */
1118
  return RTEMS_SUCCESSFUL;
1119
}
1120
 
1121
 
1122
/*
1123
 *  cd2401_stopRemoteTx
1124
 *
1125
 *  Defined as a callback, but it would appear that it is never called. The
1126
 *  POSIX standard states that when the tcflow() function is called with the
1127
 *  TCIOFF function, the system wall transmit a STOP character. Presumably,
1128
 *  tcflow() is called internally when IXOFF is set in the termios c_iflag
1129
 *  field as the input buffer is about to overflow. It should probably be
1130
 *  called from rtems_termios_enqueue_raw_characters(). Clearly, the function
1131
 *  is also explicitly callable by user code. The action is clearly to send
1132
 *  the STOP character, regardless of whether START/STOP flow control is in
1133
 *  effect.
1134
 *
1135
 *  Input parameters:
1136
 *    minor - selected channel
1137
 *
1138
 *  Output parameters: NONE
1139
 *
1140
 *  Return value: IGNORED
1141
 *
1142
 *  PROPER STOP CHARACTER MUST BE PROGRAMMED IN SCHR2.
1143
 */
1144
int cd2401_stopRemoteTx(
1145
  int minor
1146
)
1147
{
1148
  rtems_interrupt_level level;
1149
 
1150
  rtems_interrupt_disable (level);
1151
 
1152
  cd2401->car = minor;              /* Select channel */
1153
  cd2401->stcr = 0x02;              /* Send SCHR2 ahead of chars in FIFO */
1154
 
1155
  CD2401_RECORD_STOP_REMOTE_TX_INFO(( minor ));
1156
 
1157
  rtems_interrupt_enable (level);
1158
 
1159
  /* Return something */
1160
  return RTEMS_SUCCESSFUL;
1161
}
1162
 
1163
 
1164
/*
1165
 *  cd2401_write
1166
 *
1167
 *  Initiate DMA output. Termios guarantees that the buffer does not wrap
1168
 *  around, so we can do DMA strait from the supplied buffer.
1169
 *
1170
 *  Input parameters:
1171
 *    minor - selected channel
1172
 *    buf - output buffer
1173
 *    len - number of chars to output
1174
 *
1175
 *  Output parameters:  NONE
1176
 *
1177
 *  Return value: IGNORED
1178
 *
1179
 *  MUST BE EXECUTED WITH THE CD2401 INTERRUPTS DISABLED!
1180
 *  The processor is placed at interrupt level CD2401_INT_LEVEL explicitly in
1181
 *  console_write(). The processor is necessarily at interrupt level 1 in
1182
 *  cd2401_tx_isr().
1183
 */
1184
int cd2401_write(
1185
  int minor,
1186
  const char *buf,
1187
  int len
1188
)
1189
{
1190
  cd2401->car = minor;              /* Select channel */
1191
 
1192
  if ( (cd2401->dmabsts & 0x08) == 0 ) {
1193
    /* Next buffer is A. Wait for it to be ours. */
1194
    while ( cd2401->atbsts & 0x01 );
1195
 
1196
    CD2401_Channel_Info[minor].own_buf_A = FALSE;
1197
    CD2401_Channel_Info[minor].len = len;
1198
    CD2401_Channel_Info[minor].buf = buf;
1199
    cd2401->atbadru = (rtems_unsigned16)( ( (rtems_unsigned32) buf ) >> 16 );
1200
    cd2401->atbadrl = (rtems_unsigned16)( (rtems_unsigned32) buf );
1201
    cd2401->atbcnt = len;
1202
    CD2401_RECORD_WRITE_INFO(( len, buf, 'A' ));
1203
    cd2401->atbsts = 0x03;          /* CD2401 owns buffer, int when empty */
1204
  }
1205
  else {
1206
    /* Next buffer is B. Wait for it to be ours. */
1207
    while ( cd2401->btbsts & 0x01 );
1208
 
1209
    CD2401_Channel_Info[minor].own_buf_B = FALSE;
1210
    CD2401_Channel_Info[minor].len = len;
1211
    CD2401_Channel_Info[minor].buf = buf;
1212
    cd2401->btbadru = (rtems_unsigned16)( ( (rtems_unsigned32) buf ) >> 16 );
1213
    cd2401->btbadrl = (rtems_unsigned16)( (rtems_unsigned32) buf );
1214
    cd2401->btbcnt = len;
1215
    CD2401_RECORD_WRITE_INFO(( len, buf, 'B' ));
1216
    cd2401->btbsts = 0x03;          /* CD2401 owns buffer, int when empty */
1217
  }
1218
  /* Nuts -- Need TxD ints */
1219
  CD2401_Channel_Info[minor].txEmpty = FALSE;
1220
  cd2401->ier |= 0x01;
1221
 
1222
  /* Return something */
1223
  return RTEMS_SUCCESSFUL;
1224
}
1225
 
1226
#if 0
1227
/*
1228
 *  cd2401_drainOutput
1229
 *
1230
 *  Wait for the txEmpty indication on the specified channel.
1231
 *
1232
 *  Input parameters:
1233
 *    minor - selected channel
1234
 *
1235
 *  Output parameters:  NONE
1236
 *
1237
 *  Return value: IGNORED
1238
 *
1239
 *  MUST NOT BE EXECUTED WITH THE CD2401 INTERRUPTS DISABLED!
1240
 *  The txEmpty flag is set by the tx ISR.
1241
 */
1242
int cd2401_drainOutput(
1243
  int minor
1244
)
1245
{
1246
  CD2401_RECORD_DRAIN_OUTPUT_INFO(( CD2401_Channel_Info[minor].txEmpty,
1247
                                    CD2401_Channel_Info[minor].own_buf_A,
1248
                                    CD2401_Channel_Info[minor].own_buf_B ));
1249
 
1250
  while( ! (CD2401_Channel_Info[minor].txEmpty &&
1251
            CD2401_Channel_Info[minor].own_buf_A &&
1252
            CD2401_Channel_Info[minor].own_buf_B) );
1253
 
1254
  /* Return something */
1255
  return RTEMS_SUCCESSFUL;
1256
}
1257
#endif
1258
 
1259
 
1260
/*
1261
 * _167Bug_pollRead
1262
 *
1263
 *  Read a character from the 167Bug console, and return it. Return -1
1264
 *  if there is no character in the input FIFO.
1265
 *
1266
 *  Input parameters:
1267
 *    minor - selected channel
1268
 *
1269
 *  Output parameters:  NONE
1270
 *
1271
 *  Return value: char returned as positive signed int
1272
 *                -1 if no character is present in the input FIFO.
1273
 *
1274
 *  CANNOT BE COMBINED WITH INTERRUPT DRIVEN I/O!
1275
 *  This function is invoked when the device driver is compiled with
1276
 *  CD2401_POLLED_IO set to 1 above. All I/O is then done through 167Bug.
1277
 */
1278
int _167Bug_pollRead(
1279
  int minor
1280
)
1281
{
1282
  int char_not_available;
1283
  unsigned char c;
1284
 
1285
  /* Check for a char in the input FIFO */
1286
  asm volatile( "movew  #0x1, -(%%sp)   /* Code for .INSTAT */
1287
                 movew  %1, -(%%sp)     /* Channel */
1288
                 trap   #15             /* Trap to 167Bug */
1289
                 .short 0x60            /* Code for .REDIR */
1290
                 move   %%cc, %0        /* Get condition codes */
1291
                 andil  #4, %0"         /* Keep the Zero bit */
1292
    : "=d" (char_not_available) : "d" (minor): "%%cc" );
1293
 
1294
  if (char_not_available)
1295
    return -1;
1296
 
1297
  /* Read the char and return it */
1298
  asm volatile( "subq.l #2,%%a7         /* Space for result */
1299
                 movew  #0x0, -(%%sp)   /* Code for .INCHR */
1300
                 movew  %1, -(%%sp)     /* Channel */
1301
                 trap   #15             /* Trap to 167 Bug */
1302
                 .short 0x60            /* Code for .REDIR */
1303
                 moveb  (%%a7)+, %0"    /* Pop char into c */
1304
    : "=d" (c) : "d" (minor) );
1305
 
1306
  return (int)c;
1307
}
1308
 
1309
 
1310
/*
1311
 * _167Bug_pollWrite
1312
 *
1313
 *  Output buffer through 167Bug. Returns only once every character has been
1314
 *  sent (polled output).
1315
 *
1316
 *  Input parameters:
1317
 *    minor - selected channel
1318
 *    buf - output buffer
1319
 *    len - number of chars to output
1320
 *
1321
 *  Output parameters:  NONE
1322
 *
1323
 *  Return value: IGNORED
1324
 *
1325
 *  CANNOT BE COMBINED WITH INTERRUPT DRIVEN I/O!
1326
 *  This function is invoked when the device driver is compiled with
1327
 *  CD2401_POLLED_IO set to 1 above. All I/O is then done through 167Bug.
1328
 */
1329
int _167Bug_pollWrite(
1330
  int minor,
1331
  const char *buf,
1332
  int len
1333
)
1334
{
1335
  const char *endbuf = buf + len;
1336
 
1337
  asm volatile( "pea    (%0)            /* endbuf */
1338
                 pea    (%1)            /* buf */
1339
                 movew  #0x21, -(%%sp)  /* Code for .OUTSTR */
1340
                 movew  %2, -(%%sp)     /* Channel */
1341
                 trap   #15             /* Trap to 167Bug */
1342
                 .short 0x60"           /* Code for .REDIR */
1343
    :: "a" (endbuf), "a" (buf), "d" (minor) );
1344
 
1345
  /* Return something */
1346
  return RTEMS_SUCCESSFUL;
1347
}
1348
 
1349
 
1350
/*
1351
 *  Print functions: prototyped in bsp.h
1352
 *  Debug printing on Channel 1
1353
 */
1354
 
1355
void printk( char *fmt, ... )
1356
{
1357
  va_list  ap;                  /* points to each unnamed argument in turn */
1358
  static char buf[256];
1359
  unsigned int level;
1360
 
1361
  _CPU_ISR_Disable(level);
1362
 
1363
  va_start(ap, fmt);            /* make ap point to 1st unnamed arg */
1364
  vsprintf(buf, fmt, ap);       /* send output to buffer */
1365
 
1366
  BSP_output_string(buf);       /* print buffer -- Channel 1 */
1367
 
1368
  va_end(ap);                           /* clean up and re-enable interrupts */
1369
  _CPU_ISR_Enable(level);
1370
}
1371
 
1372
 
1373
void BSP_output_string( char * buf )
1374
{
1375
  int len = strlen(buf);
1376
  rtems_status_code sc;
1377
 
1378
  /* The first argument forces a print to Port2 (ttyS1) */
1379
  sc = _167Bug_pollWrite(1, buf, len);
1380
  if (sc != RTEMS_SUCCESSFUL)
1381
    rtems_fatal_error_occurred (sc);
1382
}
1383
 
1384
 
1385
/*
1386
 ***************
1387
 * BOILERPLATE *
1388
 ***************
1389
 *
1390
 *  All these functions are prototyped in rtems/c/src/lib/include/console.h.
1391
 */
1392
 
1393
/*
1394
 * Initialize and register the device
1395
 */
1396
rtems_device_driver console_initialize(
1397
  rtems_device_major_number  major,
1398
  rtems_device_minor_number  minor,
1399
  void                      *arg
1400
)
1401
{
1402
  rtems_status_code status;
1403
 
1404
  /*
1405
   * Set up TERMIOS
1406
   */
1407
  rtems_termios_initialize ();
1408
 
1409
  /*
1410
   * Do device-specific initialization
1411
   */
1412
  cd2401_initialize ();
1413
 
1414
  /*
1415
   * Register the devices
1416
   */
1417
  status = rtems_io_register_name ("/dev/tty0", major, 0);
1418
  if (status != RTEMS_SUCCESSFUL)
1419
    rtems_fatal_error_occurred (status);
1420
 
1421
  status = rtems_io_register_name ("/dev/tty1", major, 1);
1422
  if (status != RTEMS_SUCCESSFUL)
1423
    rtems_fatal_error_occurred (status);
1424
 
1425
  status = rtems_io_register_name ("/dev/console", major, 1);
1426
  if (status != RTEMS_SUCCESSFUL)
1427
    rtems_fatal_error_occurred (status);
1428
 
1429
  status = rtems_io_register_name ("/dev/tty2", major, 2);
1430
  if (status != RTEMS_SUCCESSFUL)
1431
    rtems_fatal_error_occurred (status);
1432
 
1433
  status = rtems_io_register_name ("/dev/tty3", major, 3);
1434
  if (status != RTEMS_SUCCESSFUL)
1435
    rtems_fatal_error_occurred (status);
1436
 
1437
  return RTEMS_SUCCESSFUL;
1438
}
1439
 
1440
/*
1441
 * Open the device
1442
 */
1443
rtems_device_driver console_open(
1444
  rtems_device_major_number major,
1445
  rtems_device_minor_number minor,
1446
  void                    * arg
1447
)
1448
{
1449
#if CD2401_POLLED_IO
1450
 
1451
  /* I/O is limited to 167Bug console. minor is ignored! */
1452
  static const rtems_termios_callbacks callbacks = {
1453
    NULL,                       /* firstOpen */
1454
    NULL,                       /* lastClose */
1455
    _167Bug_pollRead,           /* pollRead */
1456
    _167Bug_pollWrite,          /* write */
1457
    NULL,                       /* setAttributes */
1458
    NULL,                       /* stopRemoteTx */
1459
    NULL,                       /* startRemoteTx */
1460
 
1461
  };
1462
 
1463
#else
1464
 
1465
  static const rtems_termios_callbacks callbacks = {
1466
    cd2401_firstOpen,           /* firstOpen */
1467
    cd2401_lastClose,           /* lastClose */
1468
    NULL,                       /* pollRead */
1469
    cd2401_write,               /* write */
1470
    cd2401_setAttributes,       /* setAttributes */
1471
    cd2401_stopRemoteTx,        /* stopRemoteTx */
1472
    cd2401_startRemoteTx,       /* startRemoteTx */
1473
    1                           /* outputUsesInterrupts */
1474
  };
1475
 
1476
#endif
1477
 
1478
  return rtems_termios_open (major, minor, arg, &callbacks);
1479
}
1480
 
1481
/*
1482
 * Close the device
1483
 */
1484
rtems_device_driver console_close(
1485
  rtems_device_major_number major,
1486
  rtems_device_minor_number minor,
1487
  void                    * arg
1488
)
1489
{
1490
  return rtems_termios_close (arg);
1491
}
1492
 
1493
/*
1494
 * Read from the device
1495
 */
1496
rtems_device_driver console_read(
1497
  rtems_device_major_number major,
1498
  rtems_device_minor_number minor,
1499
  void                    * arg
1500
)
1501
{
1502
  return rtems_termios_read (arg);
1503
}
1504
 
1505
/*
1506
 * Write to the device
1507
 */
1508
rtems_device_driver console_write(
1509
  rtems_device_major_number major,
1510
  rtems_device_minor_number minor,
1511
  void                    * arg
1512
)
1513
{
1514
  return rtems_termios_write (arg);
1515
}
1516
 
1517
/*
1518
 * Handle ioctl request.
1519
 */
1520
rtems_device_driver console_control(
1521
  rtems_device_major_number major,
1522
  rtems_device_minor_number minor,
1523
  void                    * arg
1524
)
1525
{
1526
  return rtems_termios_ioctl (arg);
1527
}

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