summaryrefslogtreecommitdiff
path: root/drivers/char/rio/riocmd.c
blob: 8cc60b693460a2cbdbc9a1bca28c2a73724db162 (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
/*
** -----------------------------------------------------------------------------
**
**  Perle Specialix driver for Linux
**  ported from the existing SCO driver source
**
 *
 *  (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		: riocmd.c
**	SID		: 1.2
**	Last Modified	: 11/6/98 10:33:41
**	Retrieved	: 11/6/98 10:33:49
**
**  ident @(#)riocmd.c	1.2
**
** -----------------------------------------------------------------------------
*/
#ifdef SCCS_LABELS
static char *_riocmd_c_sccs_ = "@(#)riocmd.c	1.2";
#endif

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/tty.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_compat.h"
#include "rio_linux.h"
#include "pkt.h"
#include "daemon.h"
#include "rio.h"
#include "riospace.h"
#include "cmdpkt.h"
#include "map.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 "phb.h"
#include "link.h"
#include "cmdblk.h"
#include "route.h"
#include "cirrus.h"


static struct IdentifyRta IdRta;
static struct KillNeighbour KillUnit;

int RIOFoadRta(struct Host *HostP, struct Map *MapP)
{
	struct CmdBlk *CmdBlkP;

	rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA\n");

	CmdBlkP = RIOGetCmdBlk();

	if (!CmdBlkP) {
		rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: GetCmdBlk failed\n");
		return -ENXIO;
	}

	CmdBlkP->Packet.dest_unit = MapP->ID;
	CmdBlkP->Packet.dest_port = BOOT_RUP;
	CmdBlkP->Packet.src_unit = 0;
	CmdBlkP->Packet.src_port = BOOT_RUP;
	CmdBlkP->Packet.len = 0x84;
	CmdBlkP->Packet.data[0] = IFOAD;
	CmdBlkP->Packet.data[1] = 0;
	CmdBlkP->Packet.data[2] = IFOAD_MAGIC & 0xFF;
	CmdBlkP->Packet.data[3] = (IFOAD_MAGIC >> 8) & 0xFF;

	if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
		rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: Failed to queue foad command\n");
		return -EIO;
	}
	return 0;
}

int RIOZombieRta(struct Host *HostP, struct Map *MapP)
{
	struct CmdBlk *CmdBlkP;

	rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA\n");

	CmdBlkP = RIOGetCmdBlk();

	if (!CmdBlkP) {
		rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA: GetCmdBlk failed\n");
		return -ENXIO;
	}

	CmdBlkP->Packet.dest_unit = MapP->ID;
	CmdBlkP->Packet.dest_port = BOOT_RUP;
	CmdBlkP->Packet.src_unit = 0;
	CmdBlkP->Packet.src_port = BOOT_RUP;
	CmdBlkP->Packet.len = 0x84;
	CmdBlkP->Packet.data[0] = ZOMBIE;
	CmdBlkP->Packet.data[1] = 0;
	CmdBlkP->Packet.data[2] = ZOMBIE_MAGIC & 0xFF;
	CmdBlkP->Packet.data[3] = (ZOMBIE_MAGIC >> 8) & 0xFF;

	if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
		rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA: Failed to queue zombie command\n");
		return -EIO;
	}
	return 0;
}

int RIOCommandRta(struct rio_info *p, unsigned long RtaUnique, int (*func) (struct Host * HostP, struct Map * MapP))
{
	unsigned int Host;

	rio_dprintk(RIO_DEBUG_CMD, "Command RTA 0x%lx func %p\n", RtaUnique, func);

	if (!RtaUnique)
		return (0);

	for (Host = 0; Host < p->RIONumHosts; Host++) {
		unsigned int Rta;
		struct Host *HostP = &p->RIOHosts[Host];

		for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
			struct Map *MapP = &HostP->Mapping[Rta];

			if (MapP->RtaUniqueNum == RtaUnique) {
				uint Link;

				/*
				 ** now, lets just check we have a route to it...
				 ** IF the routing stuff is working, then one of the
				 ** topology entries for this unit will have a legit
				 ** route *somewhere*. We care not where - if its got
				 ** any connections, we can get to it.
				 */
				for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
					if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
						/*
						 ** Its worth trying the operation...
						 */
						return (*func) (HostP, MapP);
					}
				}
			}
		}
	}
	return -ENXIO;
}


int RIOIdentifyRta(struct rio_info *p, void __user * arg)
{
	unsigned int Host;

	if (copy_from_user(&IdRta, arg, sizeof(IdRta))) {
		rio_dprintk(RIO_DEBUG_CMD, "RIO_IDENTIFY_RTA copy failed\n");
		p->RIOError.Error = COPYIN_FAILED;
		return -EFAULT;
	}

	for (Host = 0; Host < p->RIONumHosts; Host++) {
		unsigned int Rta;
		struct Host *HostP = &p->RIOHosts[Host];

		for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
			struct Map *MapP = &HostP->Mapping[Rta];

			if (MapP->RtaUniqueNum == IdRta.RtaUnique) {
				uint Link;
				/*
				 ** now, lets just check we have a route to it...
				 ** IF the routing stuff is working, then one of the
				 ** topology entries for this unit will have a legit
				 ** route *somewhere*. We care not where - if its got
				 ** any connections, we can get to it.
				 */
				for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
					if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
						/*
						 ** Its worth trying the operation...
						 */
						struct CmdBlk *CmdBlkP;

						rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA\n");

						CmdBlkP = RIOGetCmdBlk();

						if (!CmdBlkP) {
							rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: GetCmdBlk failed\n");
							return -ENXIO;
						}

						CmdBlkP->Packet.dest_unit = MapP->ID;
						CmdBlkP->Packet.dest_port = BOOT_RUP;
						CmdBlkP->Packet.src_unit = 0;
						CmdBlkP->Packet.src_port = BOOT_RUP;
						CmdBlkP->Packet.len = 0x84;
						CmdBlkP->Packet.data[0] = IDENTIFY;
						CmdBlkP->Packet.data[1] = 0;
						CmdBlkP->Packet.data[2] = IdRta.ID;

						if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
							rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: Failed to queue command\n");
							return -EIO;
						}
						return 0;
					}
				}
			}
		}
	}
	return -ENOENT;
}


int RIOKillNeighbour(struct rio_info *p, void __user * arg)
{
	uint Host;
	uint ID;
	struct Host *HostP;
	struct CmdBlk *CmdBlkP;

	rio_dprintk(RIO_DEBUG_CMD, "KILL HOST NEIGHBOUR\n");

	if (copy_from_user(&KillUnit, arg, sizeof(KillUnit))) {
		rio_dprintk(RIO_DEBUG_CMD, "RIO_KILL_NEIGHBOUR copy failed\n");
		p->RIOError.Error = COPYIN_FAILED;
		return -EFAULT;
	}

	if (KillUnit.Link > 3)
		return -ENXIO;

	CmdBlkP = RIOGetCmdBlk();

	if (!CmdBlkP) {
		rio_dprintk(RIO_DEBUG_CMD, "UFOAD: GetCmdBlk failed\n");
		return -ENXIO;
	}

	CmdBlkP->Packet.dest_unit = 0;
	CmdBlkP->Packet.src_unit = 0;
	CmdBlkP->Packet.dest_port = BOOT_RUP;
	CmdBlkP->Packet.src_port = BOOT_RUP;
	CmdBlkP->Packet.len = 0x84;
	CmdBlkP->Packet.data[0] = UFOAD;
	CmdBlkP->Packet.data[1] = KillUnit.Link;
	CmdBlkP->Packet.data[2] = UFOAD_MAGIC & 0xFF;
	CmdBlkP->Packet.data[3] = (UFOAD_MAGIC >> 8) & 0xFF;

	for (Host = 0; Host < p->RIONumHosts; Host++) {
		ID = 0;
		HostP = &p->RIOHosts[Host];

		if (HostP->UniqueNum == KillUnit.UniqueNum) {
			if (RIOQueueCmdBlk(HostP, RTAS_PER_HOST + KillUnit.Link, CmdBlkP) == RIO_FAIL) {
				rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
				return -EIO;
			}
			return 0;
		}

		for (ID = 0; ID < RTAS_PER_HOST; ID++) {
			if (HostP->Mapping[ID].RtaUniqueNum == KillUnit.UniqueNum) {
				CmdBlkP->Packet.dest_unit = ID + 1;
				if (RIOQueueCmdBlk(HostP, ID, CmdBlkP) == RIO_FAIL) {
					rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
					return -EIO;
				}
				return 0;
			}
		}
	}
	RIOFreeCmdBlk(CmdBlkP);
	return -ENXIO;
}

int RIOSuspendBootRta(struct Host *HostP, int ID, int Link)
{
	struct CmdBlk *CmdBlkP;

	rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA ID %d, link %c\n", ID, 'A' + Link);

	CmdBlkP = RIOGetCmdBlk();

	if (!CmdBlkP) {
		rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: GetCmdBlk failed\n");
		return -ENXIO;
	}

	CmdBlkP->Packet.dest_unit = ID;
	CmdBlkP->Packet.dest_port = BOOT_RUP;
	CmdBlkP->Packet.src_unit = 0;
	CmdBlkP->Packet.src_port = BOOT_RUP;
	CmdBlkP->Packet.len = 0x84;
	CmdBlkP->Packet.data[0] = IWAIT;
	CmdBlkP->Packet.data[1] = Link;
	CmdBlkP->Packet.data[2] = IWAIT_MAGIC & 0xFF;
	CmdBlkP->Packet.data[3] = (IWAIT_MAGIC >> 8) & 0xFF;

	if (RIOQueueCmdBlk(HostP, ID - 1, CmdBlkP) == RIO_FAIL) {
		rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: Failed to queue iwait command\n");
		return -EIO;
	}
	return 0;
}

int RIOFoadWakeup(struct rio_info *p)
{
	int port;
	struct Port *PortP;
	unsigned long flags;

	for (port = 0; port < RIO_PORTS; port++) {
		PortP = p->RIOPortp[port];

		rio_spin_lock_irqsave(&PortP->portSem, flags);
		PortP->Config = 0;
		PortP->State = 0;
		PortP->InUse = NOT_INUSE;
		PortP->PortState = 0;
		PortP->FlushCmdBodge = 0;
		PortP->ModemLines = 0;
		PortP->ModemState = 0;
		PortP->CookMode = 0;
		PortP->ParamSem = 0;
		PortP->Mapped = 0;
		PortP->WflushFlag = 0;
		PortP->MagicFlags = 0;
		PortP->RxDataStart = 0;
		PortP->TxBufferIn = 0;
		PortP->TxBufferOut = 0;
		rio_spin_unlock_irqrestore(&PortP->portSem, flags);
	}
	return (0);
}

/*
** Incoming command on the COMMAND_RUP to be processed.
*/
static int RIOCommandRup(struct rio_info *p, uint Rup, struct Host *HostP, struct PKT __iomem *PacketP)
{
	struct PktCmd __iomem *PktCmdP = (struct PktCmd __iomem *)PacketP->data;
	struct Port *PortP;
	struct UnixRup *UnixRupP;
	unsigned short SysPort;
	unsigned short ReportedModemStatus;
	unsigned short rup;
	unsigned short subCommand;
	unsigned long flags;

	func_enter();

	/*
	 ** 16 port RTA note:
	 ** Command rup packets coming from the RTA will have pkt->data[1] (which
	 ** translates to PktCmdP->PhbNum) set to the host port number for the
	 ** particular unit. To access the correct BaseSysPort for a 16 port RTA,
	 ** we can use PhbNum to get the rup number for the appropriate 8 port
	 ** block (for the first block, this should be equal to 'Rup').
	 */
	rup = readb(&PktCmdP->PhbNum) / (unsigned short) PORTS_PER_RTA;
	UnixRupP = &HostP->UnixRups[rup];
	SysPort = UnixRupP->BaseSysPort + (readb(&PktCmdP->PhbNum) % (unsigned short) PORTS_PER_RTA);
	rio_dprintk(RIO_DEBUG_CMD, "Command on rup %d, port %d\n", rup, SysPort);

	if (UnixRupP->BaseSysPort == NO_PORT) {
		rio_dprintk(RIO_DEBUG_CMD, "OBSCURE ERROR!\n");
		rio_dprintk(RIO_DEBUG_CMD, "Diagnostics follow. Please WRITE THESE DOWN and report them to Specialix Technical Support\n");
		rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: Host number %Zd, name ``%s''\n", HostP - p->RIOHosts, HostP->Name);
		rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: Rup number  0x%x\n", rup);

		if (Rup < (unsigned short) MAX_RUP) {
			rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: This is the RUP for RTA ``%s''\n", HostP->Mapping[Rup].Name);
		} else
			rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: This is the RUP for link ``%c'' of host ``%s''\n", ('A' + Rup - MAX_RUP), HostP->Name);

		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Destination 0x%x:0x%x\n", readb(&PacketP->dest_unit), readb(&PacketP->dest_port));
		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Source	  0x%x:0x%x\n", readb(&PacketP->src_unit), readb(&PacketP->src_port));
		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Length	  0x%x (%d)\n", readb(&PacketP->len), readb(&PacketP->len));
		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Control	 0x%x (%d)\n", readb(&PacketP->control), readb(&PacketP->control));
		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Check	   0x%x (%d)\n", readw(&PacketP->csum), readw(&PacketP->csum));
		rio_dprintk(RIO_DEBUG_CMD, "COMMAND information: Host Port Number 0x%x, " "Command Code 0x%x\n", readb(&PktCmdP->PhbNum), readb(&PktCmdP->Command));
		return 1;
	}
	PortP = p->RIOPortp[SysPort];
	rio_spin_lock_irqsave(&PortP->portSem, flags);
	switch (readb(&PktCmdP->Command)) {
	case BREAK_RECEIVED:
		rio_dprintk(RIO_DEBUG_CMD, "Received a break!\n");
		/* If the current line disc. is not multi-threading and
		   the current processor is not the default, reset rup_intr
		   and return 0 to ensure that the command packet is
		   not freed. */
		/* Call tmgr HANGUP HERE */
		/* Fix this later when every thing works !!!! RAMRAJ */
		gs_got_break(&PortP->gs);
		break;

	case COMPLETE:
		rio_dprintk(RIO_DEBUG_CMD, "Command complete on phb %d host %Zd\n", readb(&PktCmdP->PhbNum), HostP - p->RIOHosts);
		subCommand = 1;
		switch (readb(&PktCmdP->SubCommand)) {
		case MEMDUMP:
			rio_dprintk(RIO_DEBUG_CMD, "Memory dump cmd (0x%x) from addr 0x%x\n", readb(&PktCmdP->SubCommand), readw(&PktCmdP->SubAddr));
			break;
		case READ_REGISTER:
			rio_dprintk(RIO_DEBUG_CMD, "Read register (0x%x)\n", readw(&PktCmdP->SubAddr));
			p->CdRegister = (readb(&PktCmdP->ModemStatus) & MSVR1_HOST);
			break;
		default:
			subCommand = 0;
			break;
		}
		if (subCommand)
			break;
		rio_dprintk(RIO_DEBUG_CMD, "New status is 0x%x was 0x%x\n", readb(&PktCmdP->PortStatus), PortP->PortState);
		if (PortP->PortState != readb(&PktCmdP->PortStatus)) {
			rio_dprintk(RIO_DEBUG_CMD, "Mark status & wakeup\n");
			PortP->PortState = readb(&PktCmdP->PortStatus);
			/* What should we do here ...
			   wakeup( &PortP->PortState );
			 */
		} else
			rio_dprintk(RIO_DEBUG_CMD, "No change\n");

		/* FALLTHROUGH */
	case MODEM_STATUS:
		/*
		 ** Knock out the tbusy and tstop bits, as these are not relevant
		 ** to the check for modem status change (they're just there because
		 ** it's a convenient place to put them!).
		 */
		ReportedModemStatus = readb(&PktCmdP->ModemStatus);
		if ((PortP->ModemState & MSVR1_HOST) == (ReportedModemStatus & MSVR1_HOST)) {
			rio_dprintk(RIO_DEBUG_CMD, "Modem status unchanged 0x%x\n", PortP->ModemState);
			/*
			 ** Update ModemState just in case tbusy or tstop states have
			 ** changed.
			 */
			PortP->ModemState = ReportedModemStatus;
		} else {
			rio_dprintk(RIO_DEBUG_CMD, "Modem status change from 0x%x to 0x%x\n", PortP->ModemState, ReportedModemStatus);
			PortP->ModemState = ReportedModemStatus;
#ifdef MODEM_SUPPORT
			if (PortP->Mapped) {
				/***********************************************************\
				*************************************************************
				***													   ***
				***		  M O D E M   S T A T E   C H A N G E		  ***
				***													   ***
				*************************************************************
				\***********************************************************/
				/*
				 ** If the device is a modem, then check the modem
				 ** carrier.
				 */
				if (PortP->gs.tty == NULL)
					break;
				if (PortP->gs.tty->termios == NULL)
					break;

				if (!(PortP->gs.tty->termios->c_cflag & CLOCAL) && ((PortP->State & (RIO_MOPEN | RIO_WOPEN)))) {

					rio_dprintk(RIO_DEBUG_CMD, "Is there a Carrier?\n");
					/*
					 ** Is there a carrier?
					 */
					if (PortP->ModemState & MSVR1_CD) {
						/*
						 ** Has carrier just appeared?
						 */
						if (!(PortP->State & RIO_CARR_ON)) {
							rio_dprintk(RIO_DEBUG_CMD, "Carrier just came up.\n");
							PortP->State |= RIO_CARR_ON;
							/*
							 ** wakeup anyone in WOPEN
							 */
							if (PortP->State & (PORT_ISOPEN | RIO_WOPEN))
								wake_up_interruptible(&PortP->gs.open_wait);
						}
					} else {
						/*
						 ** Has carrier just dropped?
						 */
						if (PortP->State & RIO_CARR_ON) {
							if (PortP->State & (PORT_ISOPEN | RIO_WOPEN | RIO_MOPEN))
								tty_hangup(PortP->gs.tty);
							PortP->State &= ~RIO_CARR_ON;
							rio_dprintk(RIO_DEBUG_CMD, "Carrirer just went down\n");
						}
					}
				}
			}
#endif
		}
		break;

	default:
		rio_dprintk(RIO_DEBUG_CMD, "Unknown command %d on CMD_RUP of host %Zd\n", readb(&PktCmdP->Command), HostP - p->RIOHosts);
		break;
	}
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);

	func_exit();

	return 1;
}

/*
** The command mechanism:
**	Each rup has a chain of commands associated with it.
**	This chain is maintained by routines in this file.
**	Periodically we are called and we run a quick check of all the
**	active chains to determine if there is a command to be executed,
**	and if the rup is ready to accept it.
**
*/

/*
** Allocate an empty command block.
*/
struct CmdBlk *RIOGetCmdBlk(void)
{
	struct CmdBlk *CmdBlkP;

	CmdBlkP = kmalloc(sizeof(struct CmdBlk), GFP_ATOMIC);
	if (CmdBlkP)
		memset(CmdBlkP, 0, sizeof(struct CmdBlk));
	return CmdBlkP;
}

/*
** Return a block to the head of the free list.
*/
void RIOFreeCmdBlk(struct CmdBlk *CmdBlkP)
{
	kfree(CmdBlkP);
}

/*
** attach a command block to the list of commands to be performed for
** a given rup.
*/
int RIOQueueCmdBlk(struct Host *HostP, uint Rup, struct CmdBlk *CmdBlkP)
{
	struct CmdBlk **Base;
	struct UnixRup *UnixRupP;
	unsigned long flags;

	if (Rup >= (unsigned short) (MAX_RUP + LINKS_PER_UNIT)) {
		rio_dprintk(RIO_DEBUG_CMD, "Illegal rup number %d in RIOQueueCmdBlk\n", Rup);
		RIOFreeCmdBlk(CmdBlkP);
		return RIO_FAIL;
	}

	UnixRupP = &HostP->UnixRups[Rup];

	rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);

	/*
	 ** If the RUP is currently inactive, then put the request
	 ** straight on the RUP....
	 */
	if ((UnixRupP->CmdsWaitingP == NULL) && (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE) && (CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP)
																	     : 1)) {
		rio_dprintk(RIO_DEBUG_CMD, "RUP inactive-placing command straight on. Cmd byte is 0x%x\n", CmdBlkP->Packet.data[0]);

		/*
		 ** Whammy! blat that pack!
		 */
		HostP->Copy(&CmdBlkP->Packet, RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->txpkt)), sizeof(struct PKT));

		/*
		 ** place command packet on the pending position.
		 */
		UnixRupP->CmdPendingP = CmdBlkP;

		/*
		 ** set the command register
		 */
		writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);

		rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);

		return 0;
	}
	rio_dprintk(RIO_DEBUG_CMD, "RUP active - en-queing\n");

	if (UnixRupP->CmdsWaitingP != NULL)
		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command waiting\n");
	if (UnixRupP->CmdPendingP != NULL)
		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command pending\n");
	if (readw(&UnixRupP->RupP->txcontrol) != TX_RUP_INACTIVE)
		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command rup not ready\n");

	Base = &UnixRupP->CmdsWaitingP;

	rio_dprintk(RIO_DEBUG_CMD, "First try to queue cmdblk %p at %p\n", CmdBlkP, Base);

	while (*Base) {
		rio_dprintk(RIO_DEBUG_CMD, "Command cmdblk %p here\n", *Base);
		Base = &((*Base)->NextP);
		rio_dprintk(RIO_DEBUG_CMD, "Now try to queue cmd cmdblk %p at %p\n", CmdBlkP, Base);
	}

	rio_dprintk(RIO_DEBUG_CMD, "Will queue cmdblk %p at %p\n", CmdBlkP, Base);

	*Base = CmdBlkP;

	CmdBlkP->NextP = NULL;

	rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);

	return 0;
}

/*
** Here we go - if there is an empty rup, fill it!
** must be called at splrio() or higher.
*/
void RIOPollHostCommands(struct rio_info *p, struct Host *HostP)
{
	struct CmdBlk *CmdBlkP;
	struct UnixRup *UnixRupP;
	struct PKT __iomem *PacketP;
	unsigned short Rup;
	unsigned long flags;


	Rup = MAX_RUP + LINKS_PER_UNIT;

	do {			/* do this loop for each RUP */
		/*
		 ** locate the rup we are processing & lock it
		 */
		UnixRupP = &HostP->UnixRups[--Rup];

		spin_lock_irqsave(&UnixRupP->RupLock, flags);

		/*
		 ** First check for incoming commands:
		 */
		if (readw(&UnixRupP->RupP->rxcontrol) != RX_RUP_INACTIVE) {
			int FreeMe;

			PacketP = (struct PKT __iomem *) RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->rxpkt));

			switch (readb(&PacketP->dest_port)) {
			case BOOT_RUP:
				rio_dprintk(RIO_DEBUG_CMD, "Incoming Boot %s packet '%x'\n", readb(&PacketP->len) & 0x80 ? "Command" : "Data", readb(&PacketP->data[0]));
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				FreeMe = RIOBootRup(p, Rup, HostP, PacketP);
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
				break;

			case COMMAND_RUP:
				/*
				 ** Free the RUP lock as loss of carrier causes a
				 ** ttyflush which will (eventually) call another
				 ** routine that uses the RUP lock.
				 */
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				FreeMe = RIOCommandRup(p, Rup, HostP, PacketP);
				if (readb(&PacketP->data[5]) == MEMDUMP) {
					rio_dprintk(RIO_DEBUG_CMD, "Memdump from 0x%x complete\n", readw(&(PacketP->data[6])));
					rio_memcpy_fromio(p->RIOMemDump, &(PacketP->data[8]), 32);
				}
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
				break;

			case ROUTE_RUP:
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				FreeMe = RIORouteRup(p, Rup, HostP, PacketP);
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
				break;

			default:
				rio_dprintk(RIO_DEBUG_CMD, "Unknown RUP %d\n", readb(&PacketP->dest_port));
				FreeMe = 1;
				break;
			}

			if (FreeMe) {
				rio_dprintk(RIO_DEBUG_CMD, "Free processed incoming command packet\n");
				put_free_end(HostP, PacketP);

				writew(RX_RUP_INACTIVE, &UnixRupP->RupP->rxcontrol);

				if (readw(&UnixRupP->RupP->handshake) == PHB_HANDSHAKE_SET) {
					rio_dprintk(RIO_DEBUG_CMD, "Handshake rup %d\n", Rup);
					writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &UnixRupP->RupP->handshake);
				}
			}
		}

		/*
		 ** IF a command was running on the port,
		 ** and it has completed, then tidy it up.
		 */
		if ((CmdBlkP = UnixRupP->CmdPendingP) &&	/* ASSIGN! */
		    (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
			/*
			 ** we are idle.
			 ** there is a command in pending.
			 ** Therefore, this command has finished.
			 ** So, wakeup whoever is waiting for it (and tell them
			 ** what happened).
			 */
			if (CmdBlkP->Packet.dest_port == BOOT_RUP)
				rio_dprintk(RIO_DEBUG_CMD, "Free Boot %s Command Block '%x'\n", CmdBlkP->Packet.len & 0x80 ? "Command" : "Data", CmdBlkP->Packet.data[0]);

			rio_dprintk(RIO_DEBUG_CMD, "Command %p completed\n", CmdBlkP);

			/*
			 ** Clear the Rup lock to prevent mutual exclusion.
			 */
			if (CmdBlkP->PostFuncP) {
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				(*CmdBlkP->PostFuncP) (CmdBlkP->PostArg, CmdBlkP);
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
			}

			/*
			 ** ....clear the pending flag....
			 */
			UnixRupP->CmdPendingP = NULL;

			/*
			 ** ....and return the command block to the freelist.
			 */
			RIOFreeCmdBlk(CmdBlkP);
		}

		/*
		 ** If there is a command for this rup, and the rup
		 ** is idle, then process the command
		 */
		if ((CmdBlkP = UnixRupP->CmdsWaitingP) &&	/* ASSIGN! */
		    (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
			/*
			 ** if the pre-function is non-zero, call it.
			 ** If it returns RIO_FAIL then don't
			 ** send this command yet!
			 */
			if (!(CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP) : 1)) {
				rio_dprintk(RIO_DEBUG_CMD, "Not ready to start command %p\n", CmdBlkP);
			} else {
				rio_dprintk(RIO_DEBUG_CMD, "Start new command %p Cmd byte is 0x%x\n", CmdBlkP, CmdBlkP->Packet.data[0]);
				/*
				 ** Whammy! blat that pack!
				 */
				HostP->Copy(&CmdBlkP->Packet, RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->txpkt)), sizeof(struct PKT));

				/*
				 ** remove the command from the rup command queue...
				 */
				UnixRupP->CmdsWaitingP = CmdBlkP->NextP;

				/*
				 ** ...and place it on the pending position.
				 */
				UnixRupP->CmdPendingP = CmdBlkP;

				/*
				 ** set the command register
				 */
				writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);

				/*
				 ** the command block will be freed
				 ** when the command has been processed.
				 */
			}
		}
		spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
	} while (Rup);
}

int RIOWFlushMark(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
	struct Port *PortP = (struct Port *) iPortP;
	unsigned long flags;

	rio_spin_lock_irqsave(&PortP->portSem, flags);
	PortP->WflushFlag++;
	PortP->MagicFlags |= MAGIC_FLUSH;
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
	return RIOUnUse(iPortP, CmdBlkP);
}

int RIORFlushEnable(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
	struct Port *PortP = (struct Port *) iPortP;
	struct PKT __iomem *PacketP;
	unsigned long flags;

	rio_spin_lock_irqsave(&PortP->portSem, flags);

	while (can_remove_receive(&PacketP, PortP)) {
		remove_receive(PortP);
		put_free_end(PortP->HostP, PacketP);
	}

	if (readw(&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_CMD, "Util: Set RX handshake bit\n");
		writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake);
	}
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
	return RIOUnUse(iPortP, CmdBlkP);
}

int RIOUnUse(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
	struct Port *PortP = (struct Port *) iPortP;
	unsigned long flags;

	rio_spin_lock_irqsave(&PortP->portSem, flags);

	rio_dprintk(RIO_DEBUG_CMD, "Decrement in use count for port\n");

	if (PortP->InUse) {
		if (--PortP->InUse != NOT_INUSE) {
			rio_spin_unlock_irqrestore(&PortP->portSem, flags);
			return 0;
		}
	}
	/*
	 ** While PortP->InUse is set (i.e. a preemptive command has been sent to
	 ** the RTA and is awaiting completion), any transmit data is prevented from
	 ** being transferred from the write queue into the transmit packets
	 ** (add_transmit) and no furthur transmit interrupt will be sent for that
	 ** data. The next interrupt will occur up to 500ms later (RIOIntr is called
	 ** twice a second as a saftey measure). This was the case when kermit was
	 ** used to send data into a RIO port. After each packet was sent, TCFLSH
	 ** was called to flush the read queue preemptively. PortP->InUse was
	 ** incremented, thereby blocking the 6 byte acknowledgement packet
	 ** transmitted back. This acknowledgment hung around for 500ms before
	 ** being sent, thus reducing input performance substantially!.
	 ** When PortP->InUse becomes NOT_INUSE, we must ensure that any data
	 ** hanging around in the transmit buffer is sent immediately.
	 */
	writew(1, &PortP->HostP->ParmMapP->tx_intr);
	/* What to do here ..
	   wakeup( (caddr_t)&(PortP->InUse) );
	 */
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
	return 0;
}

/*
** 
** How to use this file:
** 
** To send a command down a rup, you need to allocate a command block, fill
** in the packet information, fill in the command number, fill in the pre-
** and post- functions and arguments, and then add the command block to the
** queue of command blocks for the port in question. When the port is idle,
** then the pre-function will be called. If this returns RIO_FAIL then the
** command will be re-queued and tried again at a later date (probably in one
** clock tick). If the pre-function returns NOT RIO_FAIL, then the command
** packet will be queued on the RUP, and the txcontrol field set to the
** command number. When the txcontrol field has changed from being the
** command number, then the post-function will be called, with the argument
** specified earlier, a pointer to the command block, and the value of
** txcontrol.
** 
** To allocate a command block, call RIOGetCmdBlk(). This returns a pointer
** to the command block structure allocated, or NULL if there aren't any.
** The block will have been zeroed for you.
** 
** The structure has the following fields:
** 
** struct CmdBlk
** {
**	 struct CmdBlk *NextP;		  ** Pointer to next command block   **
**	 struct PKT	 Packet;		** A packet, to copy to the rup	**
**			int	 (*PreFuncP)();  ** The func to call to check if OK **
**			int	 PreArg;		** The arg for the func			**
**			int	 (*PostFuncP)(); ** The func to call when completed **
**			int	 PostArg;	   ** The arg for the func			**
** };
** 
** You need to fill in ALL fields EXCEPT NextP, which is used to link the
** blocks together either on the free list or on the Rup list.
** 
** Packet is an actual packet structure to be filled in with the packet
** information associated with the command. You need to fill in everything,
** as the command processor doesn't process the command packet in any way.
** 
** The PreFuncP is called before the packet is enqueued on the host rup.
** PreFuncP is called as (*PreFuncP)(PreArg, CmdBlkP);. PreFuncP must
** return !RIO_FAIL to have the packet queued on the rup, and RIO_FAIL
** if the packet is NOT to be queued.
** 
** The PostFuncP is called when the command has completed. It is called
** as (*PostFuncP)(PostArg, CmdBlkP, txcontrol);. PostFuncP is not expected
** to return a value. PostFuncP does NOT need to free the command block,
** as this happens automatically after PostFuncP returns.
** 
** Once the command block has been filled in, it is attached to the correct
** queue by calling RIOQueueCmdBlk( HostP, Rup, CmdBlkP ) where HostP is
** a pointer to the struct Host, Rup is the NUMBER of the rup (NOT a pointer
** to it!), and CmdBlkP is the pointer to the command block allocated using
** RIOGetCmdBlk().
** 
*/