summaryrefslogtreecommitdiffstats
path: root/drivers/char/rio/riointr.c
blob: ddda9c14e0590277984f5234edfd5291b7ebef5f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
/*
** -----------------------------------------------------------------------------
**
**  Perle Specialix driver for Linux
**  Ported from existing RIO Driver for SCO sources.
 *
 *  (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**	Module		: riointr.c
**	SID		: 1.2
**	Last Modified	: 11/6/98 10:33:44
**	Retrieved	: 11/6/98 10:33:49
**
**  ident @(#)riointr.c	1.2
**
** -----------------------------------------------------------------------------
*/
#ifdef SCCS_LABELS
static char *_riointr_c_sccs_ = "@(#)riointr.c	1.2";
#endif


#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/string.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>

#include <linux/termios.h>
#include <linux/serial.h>

#include <linux/generic_serial.h>

#include <linux/delay.h>

#include "linux_compat.h"
#include "rio_linux.h"
#include "typdef.h"
#include "pkt.h"
#include "daemon.h"
#include "rio.h"
#include "riospace.h"
#include "top.h"
#include "cmdpkt.h"
#include "map.h"
#include "riotypes.h"
#include "rup.h"
#include "port.h"
#include "riodrvr.h"
#include "rioinfo.h"
#include "func.h"
#include "errors.h"
#include "pci.h"

#include "parmmap.h"
#include "unixrup.h"
#include "board.h"
#include "host.h"
#include "error.h"
#include "phb.h"
#include "link.h"
#include "cmdblk.h"
#include "route.h"
#include "control.h"
#include "cirrus.h"
#include "rioioctl.h"


static void RIOReceive(struct rio_info *, struct Port *);


static char *firstchars (char *p, int nch)
{
  static char buf[2][128];
  static int t=0;
  t = ! t;
  memcpy (buf[t], p, nch);
  buf[t][nch] = 0;
  return buf[t];
}


#define	INCR( P, I )	((P) = (((P)+(I)) & p->RIOBufferMask))
/* Enable and start the transmission of packets */
void
RIOTxEnable(en)
char *		en;
{
  struct Port *	PortP;
  struct rio_info *p;
  struct tty_struct* tty;
  int c;
  struct PKT *	PacketP;
  unsigned long flags;

  PortP = (struct Port *)en; 
  p = (struct rio_info *)PortP->p;
  tty = PortP->gs.tty;


  rio_dprintk (RIO_DEBUG_INTR, "tx port %d: %d chars queued.\n", 
	      PortP->PortNum, PortP->gs.xmit_cnt);

  if (!PortP->gs.xmit_cnt) return;
  

  /* This routine is an order of magnitude simpler than the specialix
     version. One of the disadvantages is that this version will send
     an incomplete packet (usually 64 bytes instead of 72) once for
     every 4k worth of data. Let's just say that this won't influence
     performance significantly..... */

  rio_spin_lock_irqsave(&PortP->portSem, flags);

  while (can_add_transmit( &PacketP, PortP )) {
    c = PortP->gs.xmit_cnt;
    if (c > PKT_MAX_DATA_LEN) c = PKT_MAX_DATA_LEN;

    /* Don't copy past the end of the source buffer */
    if (c > SERIAL_XMIT_SIZE - PortP->gs.xmit_tail) 
      c = SERIAL_XMIT_SIZE - PortP->gs.xmit_tail;

    { int t;
    t = (c > 10)?10:c;
    
    rio_dprintk (RIO_DEBUG_INTR, "rio: tx port %d: copying %d chars: %s - %s\n", 
		 PortP->PortNum, c, 
		 firstchars (PortP->gs.xmit_buf + PortP->gs.xmit_tail      , t),
		 firstchars (PortP->gs.xmit_buf + PortP->gs.xmit_tail + c-t, t));
    }
    /* If for one reason or another, we can't copy more data, 
       we're done! */
    if (c == 0) break;

    rio_memcpy_toio (PortP->HostP->Caddr, (caddr_t)PacketP->data, 
		 PortP->gs.xmit_buf + PortP->gs.xmit_tail, c);
    /*    udelay (1); */

    writeb (c, &(PacketP->len));
    if (!( PortP->State & RIO_DELETED ) ) {
      add_transmit ( PortP );
      /*
      ** Count chars tx'd for port statistics reporting
      */
      if ( PortP->statsGather )
	PortP->txchars += c;
    }
    PortP->gs.xmit_tail = (PortP->gs.xmit_tail + c) & (SERIAL_XMIT_SIZE-1);
    PortP->gs.xmit_cnt -= c;
  }

  rio_spin_unlock_irqrestore(&PortP->portSem, flags);

  if (PortP->gs.xmit_cnt <= (PortP->gs.wakeup_chars + 2*PKT_MAX_DATA_LEN)) {
    rio_dprintk (RIO_DEBUG_INTR, "Waking up.... ldisc:%d (%d/%d)....",
		 (int)(PortP->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)),
		 PortP->gs.wakeup_chars, PortP->gs.xmit_cnt); 
    if ((PortP->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
	PortP->gs.tty->ldisc.write_wakeup)
      (PortP->gs.tty->ldisc.write_wakeup)(PortP->gs.tty);
    rio_dprintk (RIO_DEBUG_INTR, "(%d/%d)\n",
		PortP->gs.wakeup_chars, PortP->gs.xmit_cnt); 
    wake_up_interruptible(&PortP->gs.tty->write_wait);
  }

}


/*
** RIO Host Service routine. Does all the work traditionally associated with an
** interrupt.
*/
static int	RupIntr;
static int	RxIntr;
static int	TxIntr;
void
RIOServiceHost(p, HostP, From)
struct rio_info *	p;
struct Host *HostP;
int From; 
{
  rio_spin_lock (&HostP->HostLock);
  if ( (HostP->Flags & RUN_STATE) != RC_RUNNING ) { 
    static int t =0;
    rio_spin_unlock (&HostP->HostLock); 
    if ((t++ % 200) == 0)
      rio_dprintk (RIO_DEBUG_INTR, "Interrupt but host not running. flags=%x.\n", (int)HostP->Flags);
    return;
  }
  rio_spin_unlock (&HostP->HostLock); 

  if ( RWORD( HostP->ParmMapP->rup_intr ) ) {
    WWORD( HostP->ParmMapP->rup_intr , 0 );
    p->RIORupCount++;
    RupIntr++;
    rio_dprintk (RIO_DEBUG_INTR, "rio: RUP interrupt on host %d\n", HostP-p->RIOHosts);
    RIOPollHostCommands(p, HostP );
  }

  if ( RWORD( HostP->ParmMapP->rx_intr ) ) {
    int port;

    WWORD( HostP->ParmMapP->rx_intr , 0 );
    p->RIORxCount++;
    RxIntr++;

    rio_dprintk (RIO_DEBUG_INTR, "rio: RX interrupt on host %d\n", HostP-p->RIOHosts);
    /*
    ** Loop through every port. If the port is mapped into
    ** the system ( i.e. has /dev/ttyXXXX associated ) then it is
    ** worth checking. If the port isn't open, grab any packets
    ** hanging on its receive queue and stuff them on the free
    ** list; check for commands on the way.
    */
    for ( port=p->RIOFirstPortsBooted; 
	  port<p->RIOLastPortsBooted+PORTS_PER_RTA; port++ ) {
      struct Port *PortP = p->RIOPortp[port];
      struct tty_struct *ttyP;
      struct PKT *PacketP;
		
      /*
      ** not mapped in - most of the RIOPortp[] information
      ** has not been set up!
      ** Optimise: ports come in bundles of eight.
      */
      if ( !PortP->Mapped ) {
	port += 7;
	continue; /* with the next port */
      }

      /*
      ** If the host board isn't THIS host board, check the next one.
      ** optimise: ports come in bundles of eight.
      */
      if ( PortP->HostP != HostP ) {
	port += 7;
	continue;
      }

      /*
      ** Let us see - is the port open? If not, then don't service it.
      */
      if ( !( PortP->PortState & PORT_ISOPEN ) ) {
	continue;
      }

      /*
      ** find corresponding tty structure. The process of mapping
      ** the ports puts these here.
      */
      ttyP = PortP->gs.tty;

      /*
      ** Lock the port before we begin working on it.
      */
      rio_spin_lock(&PortP->portSem);

      /*
      ** Process received data if there is any.
      */
      if ( can_remove_receive( &PacketP, PortP ) )
	RIOReceive(p, PortP);

      /*
      ** If there is no data left to be read from the port, and
      ** it's handshake bit is set, then we must clear the handshake,
      ** so that that downstream RTA is re-enabled.
      */
      if ( !can_remove_receive( &PacketP, PortP ) && 
	   ( RWORD( PortP->PhbP->handshake )==PHB_HANDSHAKE_SET ) ) {
				/*
				** MAGIC! ( Basically, handshake the RX buffer, so that
				** the RTAs upstream can be re-enabled. )
				*/
	rio_dprintk (RIO_DEBUG_INTR, "Set RX handshake bit\n");
	WWORD( PortP->PhbP->handshake, 
	       PHB_HANDSHAKE_SET|PHB_HANDSHAKE_RESET );
      }
      rio_spin_unlock(&PortP->portSem);
    }
  }

  if ( RWORD( HostP->ParmMapP->tx_intr ) ) {
    int port;

    WWORD( HostP->ParmMapP->tx_intr , 0);

    p->RIOTxCount++;
    TxIntr++;
    rio_dprintk (RIO_DEBUG_INTR, "rio: TX interrupt on host %d\n", HostP-p->RIOHosts);

    /*
    ** Loop through every port.
    ** If the port is mapped into the system ( i.e. has /dev/ttyXXXX
    ** associated ) then it is worth checking.
    */
    for ( port=p->RIOFirstPortsBooted; 
	  port<p->RIOLastPortsBooted+PORTS_PER_RTA; port++ ) {
      struct Port *PortP = p->RIOPortp[port];
      struct tty_struct *ttyP;
      struct PKT *PacketP;

      /*
      ** not mapped in - most of the RIOPortp[] information
      ** has not been set up!
      */
      if ( !PortP->Mapped ) {
	port += 7;
	continue; /* with the next port */
      }

      /*
      ** If the host board isn't running, then its data structures
      ** are no use to us - continue quietly.
      */
      if ( PortP->HostP != HostP ) {
	port += 7;
	continue; /* with the next port */
      }

      /*
      ** Let us see - is the port open? If not, then don't service it.
      */
      if ( !( PortP->PortState & PORT_ISOPEN ) ) {
	continue;
      }

      rio_dprintk (RIO_DEBUG_INTR, "rio: Looking into port %d.\n", port);
      /*
      ** Lock the port before we begin working on it.
      */
      rio_spin_lock(&PortP->portSem);

      /*
      ** If we can't add anything to the transmit queue, then
      ** we need do none of this processing.
      */
      if ( !can_add_transmit( &PacketP, PortP ) ) {
	rio_dprintk (RIO_DEBUG_INTR, "Can't add to port, so skipping.\n");
	rio_spin_unlock(&PortP->portSem);
	continue;
      }

      /*
      ** find corresponding tty structure. The process of mapping
      ** the ports puts these here.
      */
      ttyP = PortP->gs.tty;
      /* If ttyP is NULL, the port is getting closed. Forget about it. */
      if (!ttyP) {
	rio_dprintk (RIO_DEBUG_INTR, "no tty, so skipping.\n");
	rio_spin_unlock(&PortP->portSem);
	continue;
      }
      /*
      ** If there is more room available we start up the transmit
      ** data process again. This can be direct I/O, if the cookmode
      ** is set to COOK_RAW or COOK_MEDIUM, or will be a call to the
      ** riotproc( T_OUTPUT ) if we are in COOK_WELL mode, to fetch
      ** characters via the line discipline. We must always call
      ** the line discipline,
      ** so that user input characters can be echoed correctly.
      **
      ** ++++ Update +++++
      ** With the advent of double buffering, we now see if
      ** TxBufferOut-In is non-zero. If so, then we copy a packet
      ** to the output place, and set it going. If this empties
      ** the buffer, then we must issue a wakeup( ) on OUT.
      ** If it frees space in the buffer then we must issue
      ** a wakeup( ) on IN.
      **
      ** ++++ Extra! Extra! If PortP->WflushFlag is set, then we
      ** have to send a WFLUSH command down the PHB, to mark the
      ** end point of a WFLUSH. We also need to clear out any
      ** data from the double buffer! ( note that WflushFlag is a
      ** *count* of the number of WFLUSH commands outstanding! )
      **
      ** ++++ And there's more!
      ** If an RTA is powered off, then on again, and rebooted,
      ** whilst it has ports open, then we need to re-open the ports.
      ** ( reasonable enough ). We can't do this when we spot the
      ** re-boot, in interrupt time, because the queue is probably
      ** full. So, when we come in here, we need to test if any
      ** ports are in this condition, and re-open the port before
      ** we try to send any more data to it. Now, the re-booted
      ** RTA will be discarding packets from the PHB until it
      ** receives this open packet, but don't worry tooo much
      ** about that. The one thing that is interesting is the
      ** combination of this effect and the WFLUSH effect!
      */
      /* For now don't handle RTA reboots. -- REW. 
	 Reenabled. Otherwise RTA reboots didn't work. Duh. -- REW */
      if ( PortP->MagicFlags ) {
#if 1
	if ( PortP->MagicFlags & MAGIC_REBOOT ) {
	  /*
	  ** well, the RTA has been rebooted, and there is room
	  ** on its queue to add the open packet that is required.
	  **
	  ** The messy part of this line is trying to decide if
	  ** we need to call the Param function as a tty or as
	  ** a modem.
	  ** DONT USE CLOCAL AS A TEST FOR THIS!
	  **
	  ** If we can't param the port, then move on to the
	  ** next port.
	  */
	  PortP->InUse = NOT_INUSE;

	  rio_spin_unlock(&PortP->portSem);
	  if ( RIOParam(PortP, OPEN, ((PortP->Cor2Copy & 
				       (COR2_RTSFLOW|COR2_CTSFLOW ) )== 
				      (COR2_RTSFLOW|COR2_CTSFLOW ) ) ? 
			TRUE : FALSE, DONT_SLEEP ) == RIO_FAIL ) {
	    continue; /* with next port */
	  }
	  rio_spin_lock(&PortP->portSem);
	  PortP->MagicFlags &= ~MAGIC_REBOOT;
	}
#endif

	/*
	** As mentioned above, this is a tacky hack to cope
	** with WFLUSH
	*/
	if ( PortP->WflushFlag ) {
	  rio_dprintk (RIO_DEBUG_INTR, "Want to WFLUSH mark this port\n");

	  if ( PortP->InUse )
	    rio_dprintk (RIO_DEBUG_INTR, "FAILS - PORT IS IN USE\n");
	}
				
	while ( PortP->WflushFlag &&
		can_add_transmit( &PacketP, PortP ) && 
		( PortP->InUse == NOT_INUSE ) ) {
	  int p;
	  struct PktCmd *PktCmdP;

	  rio_dprintk (RIO_DEBUG_INTR, "Add WFLUSH marker to data queue\n");
	  /*
	  ** make it look just like a WFLUSH command
	  */
	  PktCmdP = ( struct PktCmd * )&PacketP->data[0];

	  WBYTE( PktCmdP->Command , WFLUSH );

	  p =  PortP->HostPort % ( ushort )PORTS_PER_RTA;

	  /*
	  ** If second block of ports for 16 port RTA, add 8
	  ** to index 8-15.
	  */
	  if ( PortP->SecondBlock )
	    p += PORTS_PER_RTA;

	  WBYTE( PktCmdP->PhbNum, p );

	  /*
	  ** to make debuggery easier
	  */
	  WBYTE( PacketP->data[ 2], 'W'  );
	  WBYTE( PacketP->data[ 3], 'F'  );
	  WBYTE( PacketP->data[ 4], 'L'  );
	  WBYTE( PacketP->data[ 5], 'U'  );
	  WBYTE( PacketP->data[ 6], 'S'  );
	  WBYTE( PacketP->data[ 7], 'H'  );
	  WBYTE( PacketP->data[ 8], ' '  );
	  WBYTE( PacketP->data[ 9], '0'+PortP->WflushFlag );
	  WBYTE( PacketP->data[10], ' '  );
	  WBYTE( PacketP->data[11], ' '  );
	  WBYTE( PacketP->data[12], '\0' );

	  /*
	  ** its two bytes long!
	  */
	  WBYTE( PacketP->len , PKT_CMD_BIT | 2 );

	  /*
	  ** queue it!
	  */
	  if ( !( PortP->State & RIO_DELETED ) ) {
	    add_transmit( PortP );
	    /*
	    ** Count chars tx'd for port statistics reporting
	    */
	    if ( PortP->statsGather )
	      PortP->txchars += 2;
	  }

	  if ( --( PortP->WflushFlag ) == 0 ) {
	    PortP->MagicFlags &= ~MAGIC_FLUSH;
	  }

	  rio_dprintk (RIO_DEBUG_INTR, "Wflush count now stands at %d\n", 
		 PortP->WflushFlag);
	}
	if ( PortP->MagicFlags & MORE_OUTPUT_EYGOR ) {
	  if ( PortP->MagicFlags & MAGIC_FLUSH ) {
	    PortP->MagicFlags |= MORE_OUTPUT_EYGOR;
	  }
	  else {
	    if ( !can_add_transmit( &PacketP, PortP ) ) {
	      rio_spin_unlock(&PortP->portSem);
	      continue;
	    }
	    rio_spin_unlock(&PortP->portSem);
	    RIOTxEnable((char *)PortP);
	    rio_spin_lock(&PortP->portSem);
	    PortP->MagicFlags &= ~MORE_OUTPUT_EYGOR;
	  }
	}
      }


      /*
      ** If we can't add anything to the transmit queue, then
      ** we need do none of the remaining processing.
      */
      if (!can_add_transmit( &PacketP, PortP ) ) {
	rio_spin_unlock(&PortP->portSem);
	continue;
      }

      rio_spin_unlock(&PortP->portSem);
      RIOTxEnable((char *)PortP);
    }
  }
}

/*
** Routine for handling received data for clist drivers.
** NB: Called with the tty locked. The spl from the lockb( ) is passed.
** we return the ttySpl level that we re-locked at.
*/
static void
RIOReceive(p, PortP)
struct rio_info *	p;
struct Port *		PortP;
{
  struct tty_struct *TtyP;
  register ushort transCount;
  struct PKT *PacketP;
  register uint	DataCnt;
  uchar *	ptr;
  unsigned char *buf;
  int copied =0;

  static int intCount, RxIntCnt;

  /*
  ** The receive data process is to remove packets from the
  ** PHB until there aren't any more or the current cblock
  ** is full. When this occurs, there will be some left over
  ** data in the packet, that we must do something with.
  ** As we haven't unhooked the packet from the read list
  ** yet, we can just leave the packet there, having first
  ** made a note of how far we got. This means that we need
  ** a pointer per port saying where we start taking the
  ** data from - this will normally be zero, but when we
  ** run out of space it will be set to the offset of the
  ** next byte to copy from the packet data area. The packet
  ** length field is decremented by the number of bytes that
  ** we succesfully removed from the packet. When this reaches
  ** zero, we reset the offset pointer to be zero, and free
  ** the packet from the front of the queue.
  */

  intCount++;

  TtyP = PortP->gs.tty;
  if (!TtyP) {
    rio_dprintk (RIO_DEBUG_INTR, "RIOReceive: tty is null. \n");
    return;
  }

  if (PortP->State & RIO_THROTTLE_RX) {
    rio_dprintk (RIO_DEBUG_INTR, "RIOReceive: Throttled. Can't handle more input.\n");
    return;
  }

  if ( PortP->State & RIO_DELETED )
    {
      while ( can_remove_receive( &PacketP, PortP ) )
	{
	  remove_receive( PortP );
	  put_free_end( PortP->HostP, PacketP );
	}
    }
  else
    {
      /*
      ** loop, just so long as:
      **   i ) there's some data ( i.e. can_remove_receive )
      **  ii ) we haven't been blocked
      ** iii ) there's somewhere to put the data
      **  iv ) we haven't outstayed our welcome
      */
      transCount = 1;
      while ( can_remove_receive(&PacketP, PortP)
	      && transCount)
	{
#ifdef STATS
	  PortP->Stat.RxIntCnt++;
#endif /* STATS */
	  RxIntCnt++;

	  /*
	  ** check that it is not a command!
	  */
	  if ( PacketP->len & PKT_CMD_BIT ) {
	    rio_dprintk (RIO_DEBUG_INTR, "RIO: unexpected command packet received on PHB\n");
	    /*	    rio_dprint(RIO_DEBUG_INTR, (" sysport   = %d\n", p->RIOPortp->PortNum)); */
	    rio_dprintk (RIO_DEBUG_INTR, " dest_unit = %d\n", PacketP->dest_unit);
	    rio_dprintk (RIO_DEBUG_INTR, " dest_port = %d\n", PacketP->dest_port);
	    rio_dprintk (RIO_DEBUG_INTR, " src_unit  = %d\n", PacketP->src_unit);
	    rio_dprintk (RIO_DEBUG_INTR, " src_port  = %d\n", PacketP->src_port);
	    rio_dprintk (RIO_DEBUG_INTR, " len	   = %d\n", PacketP->len);
	    rio_dprintk (RIO_DEBUG_INTR, " control   = %d\n", PacketP->control);
	    rio_dprintk (RIO_DEBUG_INTR, " csum	   = %d\n", PacketP->csum);
	    rio_dprintk (RIO_DEBUG_INTR, "	 data bytes: ");
	    for ( DataCnt=0; DataCnt<PKT_MAX_DATA_LEN; DataCnt++ )
	      rio_dprintk (RIO_DEBUG_INTR, "%d\n", PacketP->data[DataCnt]);
	    remove_receive( PortP );
	    put_free_end( PortP->HostP, PacketP );
	    continue; /* with next packet */
	  }

	  /*
	  ** How many characters can we move 'upstream' ?
	  **
	  ** Determine the minimum of the amount of data
	  ** available and the amount of space in which to
	  ** put it.
	  **
	  ** 1.	Get the packet length by masking 'len'
	  **	for only the length bits.
	  ** 2.	Available space is [buffer size] - [space used]
	  **
	  ** Transfer count is the minimum of packet length
	  ** and available space.
	  */
			
	  transCount = tty_buffer_request_room(TtyP, PacketP->len & PKT_LEN_MASK);
	  rio_dprintk (RIO_DEBUG_REC,  "port %d: Copy %d bytes\n", 
				      PortP->PortNum, transCount);
	  /*
	  ** To use the following 'kkprintfs' for debugging - change the '#undef'
	  ** to '#define', (this is the only place ___DEBUG_IT___ occurs in the
	  ** driver).
	  */
#undef ___DEBUG_IT___
#ifdef ___DEBUG_IT___
	  kkprintf("I:%d R:%d P:%d Q:%d C:%d F:%x ",
		   intCount,
		   RxIntCnt,
		   PortP->PortNum,
		   TtyP->rxqueue.count,
		   transCount,
		   TtyP->flags );
#endif
	  ptr = (uchar *) PacketP->data + PortP->RxDataStart;

	  tty_prepare_flip_string(TtyP, &buf, transCount);
	  rio_memcpy_fromio (buf, ptr, transCount);
#ifdef STATS
	  /*
	  ** keep a count for statistical purposes
	  */
	  PortP->Stat.RxCharCnt	+= transCount;
#endif
	  PortP->RxDataStart	+= transCount;
	  PacketP->len		-= transCount;
	  copied += transCount;


#ifdef ___DEBUG_IT___
	  kkprintf("T:%d L:%d\n", DataCnt, PacketP->len );
#endif

	  if ( PacketP->len == 0 )
	    {
				/*
				** If we have emptied the packet, then we can
				** free it, and reset the start pointer for
				** the next packet.
				*/
	      remove_receive( PortP );
	      put_free_end( PortP->HostP, PacketP );
	      PortP->RxDataStart = 0;
#ifdef STATS
				/*
				** more lies ( oops, I mean statistics )
				*/
	      PortP->Stat.RxPktCnt++;
#endif /* STATS */
	    }
	}
    }
  if (copied) {
    rio_dprintk (RIO_DEBUG_REC, "port %d: pushing tty flip buffer: %d total bytes copied.\n", PortP->PortNum, copied);
    tty_flip_buffer_push (TtyP);
  }

  return;
}

#ifdef FUTURE_RELEASE
/*
** The proc routine called by the line discipline to do the work for it.
** The proc routine works hand in hand with the interrupt routine.
*/
int
riotproc(p, tp, cmd, port)
struct rio_info *	p;
register struct ttystatics *tp;
int cmd;
int	port;
{
	register struct Port *PortP;
	int SysPort;
	struct PKT *PacketP;

	SysPort = port;	/* Believe me, it works. */

	if ( SysPort < 0 || SysPort >= RIO_PORTS ) {
		rio_dprintk (RIO_DEBUG_INTR, "Illegal port %d derived from TTY in riotproc()\n",SysPort);
		return 0;
	}
	PortP = p->RIOPortp[SysPort];

	if ((uint)PortP->PhbP < (uint)PortP->Caddr || 
			(uint)PortP->PhbP >= (uint)PortP->Caddr+SIXTY_FOUR_K ) {
		rio_dprintk (RIO_DEBUG_INTR, "RIO: NULL or BAD PhbP on sys port %d in proc routine\n",
							SysPort);
		rio_dprintk (RIO_DEBUG_INTR, "	 PortP = 0x%x\n",PortP);
		rio_dprintk (RIO_DEBUG_INTR, "	 PortP->PhbP = 0x%x\n",PortP->PhbP);
		rio_dprintk (RIO_DEBUG_INTR, "	 PortP->Caddr = 0x%x\n",PortP->PhbP);
		rio_dprintk (RIO_DEBUG_INTR, "	 PortP->HostPort = 0x%x\n",PortP->HostPort);
		return 0;
	}

	switch(cmd) {
		case T_WFLUSH:
			rio_dprintk (RIO_DEBUG_INTR, "T_WFLUSH\n");
			/*
			** Because of the spooky way the RIO works, we don't need
			** to issue a flush command on any of the SET*F commands,
			** as that causes trouble with getty and login, which issue
			** these commands to incur a READ flush, and rely on the fact
			** that the line discipline does a wait for drain for them.
			** As the rio doesn't wait for drain, the write flush would
			** destroy the Password: prompt. This isn't very friendly, so
			** here we only issue a WFLUSH command if we are in the interrupt
			** routine, or we aren't executing a SET*F command.
			*/
			if ( PortP->HostP->InIntr || !PortP->FlushCmdBodge ) {
				/*
				** form a wflush packet - 1 byte long, no data
				*/
				if ( PortP->State & RIO_DELETED ) {
					rio_dprintk (RIO_DEBUG_INTR, "WFLUSH on deleted RTA\n");
				}
				else {
					if ( RIOPreemptiveCmd(p, PortP, WFLUSH ) == RIO_FAIL ) {
						rio_dprintk (RIO_DEBUG_INTR, "T_WFLUSH Command failed\n");
					}
					else
						rio_dprintk (RIO_DEBUG_INTR, "T_WFLUSH Command\n");
				}
				/*
				** WFLUSH operation - flush the data!
				*/
				PortP->TxBufferIn = PortP->TxBufferOut = 0;
			}
			else {
				rio_dprintk (RIO_DEBUG_INTR, "T_WFLUSH Command ignored\n");
			}
			/*
			** sort out the line discipline
			*/
			if (PortP->CookMode == COOK_WELL)
				goto start;
			break;
	
		case T_RESUME:
			rio_dprintk (RIO_DEBUG_INTR, "T_RESUME\n");
			/*
			** send pre-emptive resume packet
			*/
			if ( PortP->State & RIO_DELETED ) {
				rio_dprintk (RIO_DEBUG_INTR, "RESUME on deleted RTA\n");
			}
			else {
				if ( RIOPreemptiveCmd(p, PortP, RESUME ) == RIO_FAIL ) {
					rio_dprintk (RIO_DEBUG_INTR, "T_RESUME Command failed\n");
				}
			}
			/*
			** and re-start the sender software!
			*/
			if (PortP->CookMode == COOK_WELL)
				goto start;
			break;
	
		case T_TIME:
			rio_dprintk (RIO_DEBUG_INTR, "T_TIME\n");
			/*
			** T_TIME is called when xDLY is set in oflags and
			** the line discipline timeout has expired. It's
			** function in life is to clear the TIMEOUT flag
			** and to re-start output to the port.
			*/
			/*
			** Fall through and re-start output
			*/
		case T_OUTPUT:
start:
			if ( PortP->MagicFlags & MAGIC_FLUSH ) {
				PortP->MagicFlags |= MORE_OUTPUT_EYGOR;
				return 0;
			}
			RIOTxEnable((char *)PortP);
			PortP->MagicFlags &= ~MORE_OUTPUT_EYGOR;
			/*rio_dprint(RIO_DEBUG_INTR, PortP,DBG_PROC,"T_OUTPUT finished\n");*/
			break;
	
		case T_SUSPEND:
			rio_dprintk (RIO_DEBUG_INTR, "T_SUSPEND\n");
			/*
			** send a suspend pre-emptive packet.
			*/
			if ( PortP->State & RIO_DELETED ) {
				rio_dprintk (RIO_DEBUG_INTR, "SUSPEND deleted RTA\n");
			}
			else {
				if ( RIOPreemptiveCmd(p, PortP, SUSPEND ) == RIO_FAIL ) {
					rio_dprintk (RIO_DEBUG_INTR, "T_SUSPEND Command failed\n");
				}
			}
			/*
			** done!
			*/
			break;
	
		case T_BLOCK:
			rio_dprintk (RIO_DEBUG_INTR, "T_BLOCK\n");
			break;
	
		case T_RFLUSH:
			rio_dprintk (RIO_DEBUG_INTR, "T_RFLUSH\n");
			if ( PortP->State & RIO_DELETED ) {
				rio_dprintk (RIO_DEBUG_INTR, "RFLUSH on deleted RTA\n");
				PortP->RxDataStart = 0;
			}
			else {
				if ( RIOPreemptiveCmd( p, PortP, RFLUSH ) == RIO_FAIL ) {
					rio_dprintk (RIO_DEBUG_INTR, "T_RFLUSH Command failed\n");
					return 0;
				}
				PortP->RxDataStart = 0;
				while ( can_remove_receive(&PacketP, PortP) ) {
					remove_receive(PortP);
					ShowPacket(DBG_PROC, PacketP );
					put_free_end(PortP->HostP, PacketP );
				}
				if ( PortP->PhbP->handshake == PHB_HANDSHAKE_SET ) {
					/*
					** MAGIC!
					*/
					rio_dprintk (RIO_DEBUG_INTR, "Set receive handshake bit\n");
					PortP->PhbP->handshake |= PHB_HANDSHAKE_RESET;
				}
			}
			break;
			/* FALLTHROUGH */
		case T_UNBLOCK:
			rio_dprintk (RIO_DEBUG_INTR, "T_UNBLOCK\n");
			/*
			** If there is any data to receive set a timeout to service it.
			*/
			RIOReceive(p, PortP);
			break;
	
		case T_BREAK:
			rio_dprintk (RIO_DEBUG_INTR, "T_BREAK\n");
			/*
			** Send a break command. For Sys V
			** this is a timed break, so we
			** send a SBREAK[time] packet
			*/
			/*
			** Build a BREAK command
			*/
			if ( PortP->State & RIO_DELETED ) {
				rio_dprintk (RIO_DEBUG_INTR, "BREAK on deleted RTA\n");
			}
			else {
				if (RIOShortCommand(PortP,SBREAK,2,
								p->RIOConf.BreakInterval)==RIO_FAIL) {
			   		rio_dprintk (RIO_DEBUG_INTR, "SBREAK RIOShortCommand failed\n");
				}
			}
	
			/*
			** done!
			*/
			break;
	
		case T_INPUT:
			rio_dprintk (RIO_DEBUG_INTR, "Proc T_INPUT called - I don't know what to do!\n");
			break;
		case T_PARM:
			rio_dprintk (RIO_DEBUG_INTR, "Proc T_PARM called - I don't know what to do!\n");
			break;
	
		case T_SWTCH:
			rio_dprintk (RIO_DEBUG_INTR, "Proc T_SWTCH called - I don't know what to do!\n");
			break;
	
		default:
			rio_dprintk (RIO_DEBUG_INTR, "Proc UNKNOWN command %d\n",cmd);
	}
	/*
	** T_OUTPUT returns without passing through this point!
	*/
	/*rio_dprint(RIO_DEBUG_INTR, PortP,DBG_PROC,"riotproc done\n");*/
	return(0);
}
#endif
OpenPOWER on IntegriCloud