aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/rapidio/rio.c
blob: 7f18a65c4ed05576e4f742769defa8e2acae4c2a (plain) (blame)
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
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
/*
 * RapidIO interconnect services
 * (RapidIO Interconnect Specification, http://www.rapidio.org)
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <mporter@kernel.crashing.org>
 *
 * Copyright 2009 Integrated Device Technology, Inc.
 * Alex Bounine <alexandre.bounine@idt.com>
 * - Added Port-Write/Error Management initialization and handling
 *
 * 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.
 */

#include <linux/types.h>
#include <linux/kernel.h>

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/rio_ids.h>
#include <linux/rio_regs.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/interrupt.h>

#include "rio.h"

static LIST_HEAD(rio_mports);

/**
 * rio_local_get_device_id - Get the base/extended device id for a port
 * @port: RIO master port from which to get the deviceid
 *
 * Reads the base/extended device id from the local device
 * implementing the master port. Returns the 8/16-bit device
 * id.
 */
u16 rio_local_get_device_id(struct rio_mport *port)
{
	u32 result;

	rio_local_read_config_32(port, RIO_DID_CSR, &result);

	return (RIO_GET_DID(port->sys_size, result));
}

/**
 * rio_request_inb_mbox - request inbound mailbox service
 * @mport: RIO master port from which to allocate the mailbox resource
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox number to claim
 * @entries: Number of entries in inbound mailbox queue
 * @minb: Callback to execute when inbound message is received
 *
 * Requests ownership of an inbound mailbox resource and binds
 * a callback function to the resource. Returns %0 on success.
 */
int rio_request_inb_mbox(struct rio_mport *mport,
			 void *dev_id,
			 int mbox,
			 int entries,
			 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
				       int slot))
{
	int rc = 0;

	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
		rio_init_mbox_res(res, mbox, mbox);

		/* Make sure this mailbox isn't in use */
		if ((rc =
		     request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
				      res)) < 0) {
			kfree(res);
			goto out;
		}

		mport->inb_msg[mbox].res = res;

		/* Hook the inbound message callback */
		mport->inb_msg[mbox].mcback = minb;

		rc = rio_open_inb_mbox(mport, dev_id, mbox, entries);
	} else
		rc = -ENOMEM;

      out:
	return rc;
}

/**
 * rio_release_inb_mbox - release inbound mailbox message service
 * @mport: RIO master port from which to release the mailbox resource
 * @mbox: Mailbox number to release
 *
 * Releases ownership of an inbound mailbox resource. Returns 0
 * if the request has been satisfied.
 */
int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
{
	rio_close_inb_mbox(mport, mbox);

	/* Release the mailbox resource */
	return release_resource(mport->inb_msg[mbox].res);
}

/**
 * rio_request_outb_mbox - request outbound mailbox service
 * @mport: RIO master port from which to allocate the mailbox resource
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox number to claim
 * @entries: Number of entries in outbound mailbox queue
 * @moutb: Callback to execute when outbound message is sent
 *
 * Requests ownership of an outbound mailbox resource and binds
 * a callback function to the resource. Returns 0 on success.
 */
int rio_request_outb_mbox(struct rio_mport *mport,
			  void *dev_id,
			  int mbox,
			  int entries,
			  void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
{
	int rc = 0;

	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
		rio_init_mbox_res(res, mbox, mbox);

		/* Make sure this outbound mailbox isn't in use */
		if ((rc =
		     request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
				      res)) < 0) {
			kfree(res);
			goto out;
		}

		mport->outb_msg[mbox].res = res;

		/* Hook the inbound message callback */
		mport->outb_msg[mbox].mcback = moutb;

		rc = rio_open_outb_mbox(mport, dev_id, mbox, entries);
	} else
		rc = -ENOMEM;

      out:
	return rc;
}

/**
 * rio_release_outb_mbox - release outbound mailbox message service
 * @mport: RIO master port from which to release the mailbox resource
 * @mbox: Mailbox number to release
 *
 * Releases ownership of an inbound mailbox resource. Returns 0
 * if the request has been satisfied.
 */
int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
{
	rio_close_outb_mbox(mport, mbox);

	/* Release the mailbox resource */
	return release_resource(mport->outb_msg[mbox].res);
}

/**
 * rio_setup_inb_dbell - bind inbound doorbell callback
 * @mport: RIO master port to bind the doorbell callback
 * @dev_id: Device specific pointer to pass on event
 * @res: Doorbell message resource
 * @dinb: Callback to execute when doorbell is received
 *
 * Adds a doorbell resource/callback pair into a port's
 * doorbell event list. Returns 0 if the request has been
 * satisfied.
 */
static int
rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
		    void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
				  u16 info))
{
	int rc = 0;
	struct rio_dbell *dbell;

	if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
		rc = -ENOMEM;
		goto out;
	}

	dbell->res = res;
	dbell->dinb = dinb;
	dbell->dev_id = dev_id;

	list_add_tail(&dbell->node, &mport->dbells);

      out:
	return rc;
}

/**
 * rio_request_inb_dbell - request inbound doorbell message service
 * @mport: RIO master port from which to allocate the doorbell resource
 * @dev_id: Device specific pointer to pass on event
 * @start: Doorbell info range start
 * @end: Doorbell info range end
 * @dinb: Callback to execute when doorbell is received
 *
 * Requests ownership of an inbound doorbell resource and binds
 * a callback function to the resource. Returns 0 if the request
 * has been satisfied.
 */
int rio_request_inb_dbell(struct rio_mport *mport,
			  void *dev_id,
			  u16 start,
			  u16 end,
			  void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
					u16 dst, u16 info))
{
	int rc = 0;

	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
		rio_init_dbell_res(res, start, end);

		/* Make sure these doorbells aren't in use */
		if ((rc =
		     request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
				      res)) < 0) {
			kfree(res);
			goto out;
		}

		/* Hook the doorbell callback */
		rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
	} else
		rc = -ENOMEM;

      out:
	return rc;
}

/**
 * rio_release_inb_dbell - release inbound doorbell message service
 * @mport: RIO master port from which to release the doorbell resource
 * @start: Doorbell info range start
 * @end: Doorbell info range end
 *
 * Releases ownership of an inbound doorbell resource and removes
 * callback from the doorbell event list. Returns 0 if the request
 * has been satisfied.
 */
int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
{
	int rc = 0, found = 0;
	struct rio_dbell *dbell;

	list_for_each_entry(dbell, &mport->dbells, node) {
		if ((dbell->res->start == start) && (dbell->res->end == end)) {
			found = 1;
			break;
		}
	}

	/* If we can't find an exact match, fail */
	if (!found) {
		rc = -EINVAL;
		goto out;
	}

	/* Delete from list */
	list_del(&dbell->node);

	/* Release the doorbell resource */
	rc = release_resource(dbell->res);

	/* Free the doorbell event */
	kfree(dbell);

      out:
	return rc;
}

/**
 * rio_request_outb_dbell - request outbound doorbell message range
 * @rdev: RIO device from which to allocate the doorbell resource
 * @start: Doorbell message range start
 * @end: Doorbell message range end
 *
 * Requests ownership of a doorbell message range. Returns a resource
 * if the request has been satisfied or %NULL on failure.
 */
struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
					u16 end)
{
	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
		rio_init_dbell_res(res, start, end);

		/* Make sure these doorbells aren't in use */
		if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
		    < 0) {
			kfree(res);
			res = NULL;
		}
	}

	return res;
}

/**
 * rio_release_outb_dbell - release outbound doorbell message range
 * @rdev: RIO device from which to release the doorbell resource
 * @res: Doorbell resource to be freed
 *
 * Releases ownership of a doorbell message range. Returns 0 if the
 * request has been satisfied.
 */
int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
{
	int rc = release_resource(res);

	kfree(res);

	return rc;
}

/**
 * rio_request_inb_pwrite - request inbound port-write message service
 * @rdev: RIO device to which register inbound port-write callback routine
 * @pwcback: Callback routine to execute when port-write is received
 *
 * Binds a port-write callback function to the RapidIO device.
 * Returns 0 if the request has been satisfied.
 */
int rio_request_inb_pwrite(struct rio_dev *rdev,
	int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
{
	int rc = 0;

	spin_lock(&rio_global_list_lock);
	if (rdev->pwcback != NULL)
		rc = -ENOMEM;
	else
		rdev->pwcback = pwcback;

	spin_unlock(&rio_global_list_lock);
	return rc;
}
EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);

/**
 * rio_release_inb_pwrite - release inbound port-write message service
 * @rdev: RIO device which registered for inbound port-write callback
 *
 * Removes callback from the rio_dev structure. Returns 0 if the request
 * has been satisfied.
 */
int rio_release_inb_pwrite(struct rio_dev *rdev)
{
	int rc = -ENOMEM;

	spin_lock(&rio_global_list_lock);
	if (rdev->pwcback) {
		rdev->pwcback = NULL;
		rc = 0;
	}

	spin_unlock(&rio_global_list_lock);
	return rc;
}
EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);

/**
 * rio_mport_get_physefb - Helper function that returns register offset
 *                      for Physical Layer Extended Features Block.
 * @port: Master port to issue transaction
 * @local: Indicate a local master port or remote device access
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 */
u32
rio_mport_get_physefb(struct rio_mport *port, int local,
		      u16 destid, u8 hopcount)
{
	u32 ext_ftr_ptr;
	u32 ftr_header;

	ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);

	while (ext_ftr_ptr)  {
		if (local)
			rio_local_read_config_32(port, ext_ftr_ptr,
						 &ftr_header);
		else
			rio_mport_read_config_32(port, destid, hopcount,
						 ext_ftr_ptr, &ftr_header);

		ftr_header = RIO_GET_BLOCK_ID(ftr_header);
		switch (ftr_header) {

		case RIO_EFB_SER_EP_ID_V13P:
		case RIO_EFB_SER_EP_REC_ID_V13P:
		case RIO_EFB_SER_EP_FREE_ID_V13P:
		case RIO_EFB_SER_EP_ID:
		case RIO_EFB_SER_EP_REC_ID:
		case RIO_EFB_SER_EP_FREE_ID:
		case RIO_EFB_SER_EP_FREC_ID:

			return ext_ftr_ptr;

		default:
			break;
		}

		ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
						hopcount, ext_ftr_ptr);
	}

	return ext_ftr_ptr;
}

/**
 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
 * @comp_tag: RIO component tag to match
 * @from: Previous RIO device found in search, or %NULL for new search
 *
 * Iterates through the list of known RIO devices. If a RIO device is
 * found with a matching @comp_tag, a pointer to its device
 * structure is returned. Otherwise, %NULL is returned. A new search
 * is initiated by passing %NULL to the @from argument. Otherwise, if
 * @from is not %NULL, searches continue from next device on the global
 * list.
 */
struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
{
	struct list_head *n;
	struct rio_dev *rdev;

	spin_lock(&rio_global_list_lock);
	n = from ? from->global_list.next : rio_devices.next;

	while (n && (n != &rio_devices)) {
		rdev = rio_dev_g(n);
		if (rdev->comp_tag == comp_tag)
			goto exit;
		n = n->next;
	}
	rdev = NULL;
exit:
	spin_unlock(&rio_global_list_lock);
	return rdev;
}

/**
 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
 * @rdev: Pointer to RIO device control structure
 * @pnum: Switch port number to set LOCKOUT bit
 * @lock: Operation : set (=1) or clear (=0)
 */
int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
{
	u8 hopcount = 0xff;
	u16 destid = rdev->destid;
	u32 regval;

	if (rdev->rswitch) {
		destid = rdev->rswitch->destid;
		hopcount = rdev->rswitch->hopcount;
	}

	rio_mport_read_config_32(rdev->net->hport, destid, hopcount,
				 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
				 &regval);
	if (lock)
		regval |= RIO_PORT_N_CTL_LOCKOUT;
	else
		regval &= ~RIO_PORT_N_CTL_LOCKOUT;

	rio_mport_write_config_32(rdev->net->hport, destid, hopcount,
				  rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
				  regval);
	return 0;
}

/**
 * rio_chk_dev_route - Validate route to the specified device.
 * @rdev:  RIO device failed to respond
 * @nrdev: Last active device on the route to rdev
 * @npnum: nrdev's port number on the route to rdev
 *
 * Follows a route to the specified RIO device to determine the last available
 * device (and corresponding RIO port) on the route.
 */
static int
rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
{
	u32 result;
	int p_port, dstid, rc = -EIO;
	struct rio_dev *prev = NULL;

	/* Find switch with failed RIO link */
	while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
		if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
			prev = rdev->prev;
			break;
		}
		rdev = rdev->prev;
	}

	if (prev == NULL)
		goto err_out;

	dstid = (rdev->pef & RIO_PEF_SWITCH) ?
			rdev->rswitch->destid : rdev->destid;
	p_port = prev->rswitch->route_table[dstid];

	if (p_port != RIO_INVALID_ROUTE) {
		pr_debug("RIO: link failed on [%s]-P%d\n",
			 rio_name(prev), p_port);
		*nrdev = prev;
		*npnum = p_port;
		rc = 0;
	} else
		pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
err_out:
	return rc;
}

/**
 * rio_mport_chk_dev_access - Validate access to the specified device.
 * @mport: Master port to send transactions
 * @destid: Device destination ID in network
 * @hopcount: Number of hops into the network
 */
int
rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
{
	int i = 0;
	u32 tmp;

	while (rio_mport_read_config_32(mport, destid, hopcount,
					RIO_DEV_ID_CAR, &tmp)) {
		i++;
		if (i == RIO_MAX_CHK_RETRY)
			return -EIO;
		mdelay(1);
	}

	return 0;
}

/**
 * rio_chk_dev_access - Validate access to the specified device.
 * @rdev: Pointer to RIO device control structure
 */
static int rio_chk_dev_access(struct rio_dev *rdev)
{
	u8 hopcount = 0xff;
	u16 destid = rdev->destid;

	if (rdev->rswitch) {
		destid = rdev->rswitch->destid;
		hopcount = rdev->rswitch->hopcount;
	}

	return rio_mport_chk_dev_access(rdev->net->hport, destid, hopcount);
}

/**
 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
 *                        returns link-response (if requested).
 * @rdev: RIO devive to issue Input-status command
 * @pnum: Device port number to issue the command
 * @lnkresp: Response from a link partner
 */
static int
rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
{
	struct rio_mport *mport = rdev->net->hport;
	u16 destid = rdev->rswitch->destid;
	u8 hopcount = rdev->rswitch->hopcount;
	u32 regval;
	int checkcount;

	if (lnkresp) {
		/* Read from link maintenance response register
		 * to clear valid bit */
		rio_mport_read_config_32(mport, destid, hopcount,
			rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
			&regval);
		udelay(50);
	}

	/* Issue Input-status command */
	rio_mport_write_config_32(mport, destid, hopcount,
		rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
		RIO_MNT_REQ_CMD_IS);

	/* Exit if the response is not expected */
	if (lnkresp == NULL)
		return 0;

	checkcount = 3;
	while (checkcount--) {
		udelay(50);
		rio_mport_read_config_32(mport, destid, hopcount,
			rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
			&regval);
		if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
			*lnkresp = regval;
			return 0;
		}
	}

	return -EIO;
}

/**
 * rio_clr_err_stopped - Clears port Error-stopped states.
 * @rdev: Pointer to RIO device control structure
 * @pnum: Switch port number to clear errors
 * @err_status: port error status (if 0 reads register from device)
 */
static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
{
	struct rio_mport *mport = rdev->net->hport;
	u16 destid = rdev->rswitch->destid;
	u8 hopcount = rdev->rswitch->hopcount;
	struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
	u32 regval;
	u32 far_ackid, far_linkstat, near_ackid;

	if (err_status == 0)
		rio_mport_read_config_32(mport, destid, hopcount,
			rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
			&err_status);

	if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
		pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
		/*
		 * Send a Link-Request/Input-Status control symbol
		 */
		if (rio_get_input_status(rdev, pnum, &regval)) {
			pr_debug("RIO_EM: Input-status response timeout\n");
			goto rd_err;
		}

		pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
			 pnum, regval);
		far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
		far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
		rio_mport_read_config_32(mport, destid, hopcount,
			rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
			&regval);
		pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
		near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
		pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
			 " near_ackID=0x%02x\n",
			pnum, far_ackid, far_linkstat, near_ackid);

		/*
		 * If required, synchronize ackIDs of near and
		 * far sides.
		 */
		if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
		    (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
			/* Align near outstanding/outbound ackIDs with
			 * far inbound.
			 */
			rio_mport_write_config_32(mport, destid,
				hopcount, rdev->phys_efptr +
					RIO_PORT_N_ACK_STS_CSR(pnum),
				(near_ackid << 24) |
					(far_ackid << 8) | far_ackid);
			/* Align far outstanding/outbound ackIDs with
			 * near inbound.
			 */
			far_ackid++;
			if (nextdev)
				rio_write_config_32(nextdev,
					nextdev->phys_efptr +
					RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
					(far_ackid << 24) |
					(near_ackid << 8) | near_ackid);
			else
				pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
		}
rd_err:
		rio_mport_read_config_32(mport, destid, hopcount,
			rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
			&err_status);
		pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
	}

	if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
		pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
		rio_get_input_status(nextdev,
				     RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
		udelay(50);

		rio_mport_read_config_32(mport, destid, hopcount,
			rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
			&err_status);
		pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
	}

	return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
			      RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
}

/**
 * rio_inb_pwrite_handler - process inbound port-write message
 * @pw_msg: pointer to inbound port-write message
 *
 * Processes an inbound port-write message. Returns 0 if the request
 * has been satisfied.
 */
int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
{
	struct rio_dev *rdev;
	struct rio_mport *mport;
	u8 hopcount;
	u16 destid;
	u32 err_status, em_perrdet, em_ltlerrdet;
	int rc, portnum;

	rdev = rio_get_comptag(pw_msg->em.comptag, NULL);
	if (rdev == NULL) {
		/* Device removed or enumeration error */
		pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
			__func__, pw_msg->em.comptag);
		return -EIO;
	}

	pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));

#ifdef DEBUG_PW
	{
	u32 i;
	for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) {
			pr_debug("0x%02x: %08x %08x %08x %08x\n",
				 i*4, pw_msg->raw[i], pw_msg->raw[i + 1],
				 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
			i += 4;
	}
	}
#endif

	/* Call an external service function (if such is registered
	 * for this device). This may be the service for endpoints that send
	 * device-specific port-write messages. End-point messages expected
	 * to be handled completely by EP specific device driver.
	 * For switches rc==0 signals that no standard processing required.
	 */
	if (rdev->pwcback != NULL) {
		rc = rdev->pwcback(rdev, pw_msg, 0);
		if (rc == 0)
			return 0;
	}

	portnum = pw_msg->em.is_port & 0xFF;

	/* Check if device and route to it are functional:
	 * Sometimes devices may send PW message(s) just before being
	 * powered down (or link being lost).
	 */
	if (rio_chk_dev_access(rdev)) {
		pr_debug("RIO: device access failed - get link partner\n");
		/* Scan route to the device and identify failed link.
		 * This will replace device and port reported in PW message.
		 * PW message should not be used after this point.
		 */
		if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
			pr_err("RIO: Route trace for %s failed\n",
				rio_name(rdev));
			return -EIO;
		}
		pw_msg = NULL;
	}

	/* For End-point devices processing stops here */
	if (!(rdev->pef & RIO_PEF_SWITCH))
		return 0;

	if (rdev->phys_efptr == 0) {
		pr_err("RIO_PW: Bad switch initialization for %s\n",
			rio_name(rdev));
		return 0;
	}

	mport = rdev->net->hport;
	destid = rdev->rswitch->destid;
	hopcount = rdev->rswitch->hopcount;

	/*
	 * Process the port-write notification from switch
	 */
	if (rdev->rswitch->em_handle)
		rdev->rswitch->em_handle(rdev, portnum);

	rio_mport_read_config_32(mport, destid, hopcount,
			rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
			&err_status);
	pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);

	if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {

		if (!(rdev->rswitch->port_ok & (1 << portnum))) {
			rdev->rswitch->port_ok |= (1 << portnum);
			rio_set_port_lockout(rdev, portnum, 0);
			/* Schedule Insertion Service */
			pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
			       rio_name(rdev), portnum);
		}

		/* Clear error-stopped states (if reported).
		 * Depending on the link partner state, two attempts
		 * may be needed for successful recovery.
		 */
		if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
				  RIO_PORT_N_ERR_STS_PW_INP_ES)) {
			if (rio_clr_err_stopped(rdev, portnum, err_status))
				rio_clr_err_stopped(rdev, portnum, 0);
		}
	}  else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */

		if (rdev->rswitch->port_ok & (1 << portnum)) {
			rdev->rswitch->port_ok &= ~(1 << portnum);
			rio_set_port_lockout(rdev, portnum, 1);

			rio_mport_write_config_32(mport, destid, hopcount,
				rdev->phys_efptr +
					RIO_PORT_N_ACK_STS_CSR(portnum),
				RIO_PORT_N_ACK_CLEAR);

			/* Schedule Extraction Service */
			pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
			       rio_name(rdev), portnum);
		}
	}

	rio_mport_read_config_32(mport, destid, hopcount,
		rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
	if (em_perrdet) {
		pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
			 portnum, em_perrdet);
		/* Clear EM Port N Error Detect CSR */
		rio_mport_write_config_32(mport, destid, hopcount,
			rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
	}

	rio_mport_read_config_32(mport, destid, hopcount,
		rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
	if (em_ltlerrdet) {
		pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
			 em_ltlerrdet);
		/* Clear EM L/T Layer Error Detect CSR */
		rio_mport_write_config_32(mport, destid, hopcount,
			rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
	}

	/* Clear remaining error bits */
	rio_mport_write_config_32(mport, destid, hopcount,
			rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
			err_status & RIO_PORT_N_ERR_STS_CLR_MASK);

	/* Clear Port-Write Pending bit */
	rio_mport_write_config_32(mport, destid, hopcount,
			rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
			RIO_PORT_N_ERR_STS_PW_PEND);

	return 0;
}
EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);

/**
 * rio_mport_get_efb - get pointer to next extended features block
 * @port: Master port to issue transaction
 * @local: Indicate a local master port or remote device access
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 * @from: Offset of  current Extended Feature block header (if 0 starts
 * from	ExtFeaturePtr)
 */
u32
rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
		      u8 hopcount, u32 from)
{
	u32 reg_val;

	if (from == 0) {
		if (local)
			rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
						 &reg_val);
		else
			rio_mport_read_config_32(port, destid, hopcount,
						 RIO_ASM_INFO_CAR, &reg_val);
		return reg_val & RIO_EXT_FTR_PTR_MASK;
	} else {
		if (local)
			rio_local_read_config_32(port, from, &reg_val);
		else
			rio_mport_read_config_32(port, destid, hopcount,
						 from, &reg_val);
		return RIO_GET_BLOCK_ID(reg_val);
	}
}

/**
 * rio_mport_get_feature - query for devices' extended features
 * @port: Master port to issue transaction
 * @local: Indicate a local master port or remote device access
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 * @ftr: Extended feature code
 *
 * Tell if a device supports a given RapidIO capability.
 * Returns the offset of the requested extended feature
 * block within the device's RIO configuration space or
 * 0 in case the device does not support it.  Possible
 * values for @ftr:
 *
 * %RIO_EFB_PAR_EP_ID		LP/LVDS EP Devices
 *
 * %RIO_EFB_PAR_EP_REC_ID	LP/LVDS EP Recovery Devices
 *
 * %RIO_EFB_PAR_EP_FREE_ID	LP/LVDS EP Free Devices
 *
 * %RIO_EFB_SER_EP_ID		LP/Serial EP Devices
 *
 * %RIO_EFB_SER_EP_REC_ID	LP/Serial EP Recovery Devices
 *
 * %RIO_EFB_SER_EP_FREE_ID	LP/Serial EP Free Devices
 */
u32
rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
		      u8 hopcount, int ftr)
{
	u32 asm_info, ext_ftr_ptr, ftr_header;

	if (local)
		rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
	else
		rio_mport_read_config_32(port, destid, hopcount,
					 RIO_ASM_INFO_CAR, &asm_info);

	ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;

	while (ext_ftr_ptr) {
		if (local)
			rio_local_read_config_32(port, ext_ftr_ptr,
						 &ftr_header);
		else
			rio_mport_read_config_32(port, destid, hopcount,
						 ext_ftr_ptr, &ftr_header);
		if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
			return ext_ftr_ptr;
		if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
			break;
	}

	return 0;
}

/**
 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
 * @did: RIO did to match or %RIO_ANY_ID to match all dids
 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
 * @from: Previous RIO device found in search, or %NULL for new search
 *
 * Iterates through the list of known RIO devices. If a RIO device is
 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
 * count to the device is incrememted and a pointer to its device
 * structure is returned. Otherwise, %NULL is returned. A new search
 * is initiated by passing %NULL to the @from argument. Otherwise, if
 * @from is not %NULL, searches continue from next device on the global
 * list. The reference count for @from is always decremented if it is
 * not %NULL.
 */
struct rio_dev *rio_get_asm(u16 vid, u16 did,
			    u16 asm_vid, u16 asm_did, struct rio_dev *from)
{
	struct list_head *n;
	struct rio_dev *rdev;

	WARN_ON(in_interrupt());
	spin_lock(&rio_global_list_lock);
	n = from ? from->global_list.next : rio_devices.next;

	while (n && (n != &rio_devices)) {
		rdev = rio_dev_g(n);
		if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
		    (did == RIO_ANY_ID || rdev->did == did) &&
		    (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
		    (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
			goto exit;
		n = n->next;
	}
	rdev = NULL;
      exit:
	rio_dev_put(from);
	rdev = rio_dev_get(rdev);
	spin_unlock(&rio_global_list_lock);
	return rdev;
}

/**
 * rio_get_device - Begin or continue searching for a RIO device by vid/did
 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
 * @did: RIO did to match or %RIO_ANY_ID to match all dids
 * @from: Previous RIO device found in search, or %NULL for new search
 *
 * Iterates through the list of known RIO devices. If a RIO device is
 * found with a matching @vid and @did, the reference count to the
 * device is incrememted and a pointer to its device structure is returned.
 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
 * to the @from argument. Otherwise, if @from is not %NULL, searches
 * continue from next device on the global list. The reference count for
 * @from is always decremented if it is not %NULL.
 */
struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
{
	return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
}

/**
 * rio_std_route_add_entry - Add switch route table entry using standard
 *   registers defined in RIO specification rev.1.3
 * @mport: Master port to issue transaction
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 * @table: routing table ID (global or port-specific)
 * @route_destid: destID entry in the RT
 * @route_port: destination port for specified destID
 */
int rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
		       u16 table, u16 route_destid, u8 route_port)
{
	if (table == RIO_GLOBAL_TABLE) {
		rio_mport_write_config_32(mport, destid, hopcount,
				RIO_STD_RTE_CONF_DESTID_SEL_CSR,
				(u32)route_destid);
		rio_mport_write_config_32(mport, destid, hopcount,
				RIO_STD_RTE_CONF_PORT_SEL_CSR,
				(u32)route_port);
	}

	udelay(10);
	return 0;
}

/**
 * rio_std_route_get_entry - Read switch route table entry (port number)
 *   associated with specified destID using standard registers defined in RIO
 *   specification rev.1.3
 * @mport: Master port to issue transaction
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 * @table: routing table ID (global or port-specific)
 * @route_destid: destID entry in the RT
 * @route_port: returned destination port for specified destID
 */
int rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
		       u16 table, u16 route_destid, u8 *route_port)
{
	u32 result;

	if (table == RIO_GLOBAL_TABLE) {
		rio_mport_write_config_32(mport, destid, hopcount,
				RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
		rio_mport_read_config_32(mport, destid, hopcount,
				RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);

		*route_port = (u8)result;
	}

	return 0;
}

/**
 * rio_std_route_clr_table - Clear swotch route table using standard registers
 *   defined in RIO specification rev.1.3.
 * @mport: Master port to issue transaction
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 * @table: routing table ID (global or port-specific)
 */
int rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
		       u16 table)
{
	u32 max_destid = 0xff;
	u32 i, pef, id_inc = 1, ext_cfg = 0;
	u32 port_sel = RIO_INVALID_ROUTE;

	if (table == RIO_GLOBAL_TABLE) {
		rio_mport_read_config_32(mport, destid, hopcount,
					 RIO_PEF_CAR, &pef);

		if (mport->sys_size) {
			rio_mport_read_config_32(mport, destid, hopcount,
						 RIO_SWITCH_RT_LIMIT,
						 &max_destid);
			max_destid &= RIO_RT_MAX_DESTID;
		}

		if (pef & RIO_PEF_EXT_RT) {
			ext_cfg = 0x80000000;
			id_inc = 4;
			port_sel = (RIO_INVALID_ROUTE << 24) |
				   (RIO_INVALID_ROUTE << 16) |
				   (RIO_INVALID_ROUTE << 8) |
				   RIO_INVALID_ROUTE;
		}

		for (i = 0; i <= max_destid;) {
			rio_mport_write_config_32(mport, destid, hopcount,
					RIO_STD_RTE_CONF_DESTID_SEL_CSR,
					ext_cfg | i);
			rio_mport_write_config_32(mport, destid, hopcount,
					RIO_STD_RTE_CONF_PORT_SEL_CSR,
					port_sel);
			i += id_inc;
		}
	}

	udelay(10);
	return 0;
}

static void rio_fixup_device(struct rio_dev *dev)
{
}

static int __devinit rio_init(void)
{
	struct rio_dev *dev = NULL;

	while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
		rio_fixup_device(dev);
	}
	return 0;
}

device_initcall(rio_init);

int __devinit rio_init_mports(void)
{
	int rc = 0;
	struct rio_mport *port;

	list_for_each_entry(port, &rio_mports, node) {
		if (!request_mem_region(port->iores.start,
					port->iores.end - port->iores.start,
					port->name)) {
			printk(KERN_ERR
			       "RIO: Error requesting master port region 0x%016llx-0x%016llx\n",
			       (u64)port->iores.start, (u64)port->iores.end - 1);
			rc = -ENOMEM;
			goto out;
		}

		if (port->host_deviceid >= 0)
			rio_enum_mport(port);
		else
			rio_disc_mport(port);
	}

      out:
	return rc;
}

void rio_register_mport(struct rio_mport *port)
{
	list_add_tail(&port->node, &rio_mports);
}

EXPORT_SYMBOL_GPL(rio_local_get_device_id);
EXPORT_SYMBOL_GPL(rio_get_device);
EXPORT_SYMBOL_GPL(rio_get_asm);
EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
EXPORT_SYMBOL_GPL(rio_release_outb_mbox);