aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/isci/port.c
blob: 8f6f9b77e41a45f46cfbe358af0e732307d8b26f (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
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
/*
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * BSD LICENSE
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "isci.h"
#include "port.h"
#include "request.h"

#define SCIC_SDS_PORT_HARD_RESET_TIMEOUT  (1000)
#define SCU_DUMMY_INDEX    (0xFFFF)

static void isci_port_change_state(struct isci_port *iport, enum isci_status status)
{
	unsigned long flags;

	dev_dbg(&iport->isci_host->pdev->dev,
		"%s: iport = %p, state = 0x%x\n",
		__func__, iport, status);

	/* XXX pointless lock */
	spin_lock_irqsave(&iport->state_lock, flags);
	iport->status = status;
	spin_unlock_irqrestore(&iport->state_lock, flags);
}

static void sci_port_get_protocols(struct isci_port *iport, struct sci_phy_proto *proto)
{
	u8 index;

	proto->all = 0;
	for (index = 0; index < SCI_MAX_PHYS; index++) {
		struct isci_phy *iphy = iport->phy_table[index];

		if (!iphy)
			continue;
		sci_phy_get_protocols(iphy, proto);
	}
}

static u32 sci_port_get_phys(struct isci_port *iport)
{
	u32 index;
	u32 mask;

	mask = 0;
	for (index = 0; index < SCI_MAX_PHYS; index++)
		if (iport->phy_table[index])
			mask |= (1 << index);

	return mask;
}

/**
 * sci_port_get_properties() - This method simply returns the properties
 *    regarding the port, such as: physical index, protocols, sas address, etc.
 * @port: this parameter specifies the port for which to retrieve the physical
 *    index.
 * @properties: This parameter specifies the properties structure into which to
 *    copy the requested information.
 *
 * Indicate if the user specified a valid port. SCI_SUCCESS This value is
 * returned if the specified port was valid. SCI_FAILURE_INVALID_PORT This
 * value is returned if the specified port is not valid.  When this value is
 * returned, no data is copied to the properties output parameter.
 */
static enum sci_status sci_port_get_properties(struct isci_port *iport,
						struct sci_port_properties *prop)
{
	if (!iport || iport->logical_port_index == SCIC_SDS_DUMMY_PORT)
		return SCI_FAILURE_INVALID_PORT;

	prop->index = iport->logical_port_index;
	prop->phy_mask = sci_port_get_phys(iport);
	sci_port_get_sas_address(iport, &prop->local.sas_address);
	sci_port_get_protocols(iport, &prop->local.protocols);
	sci_port_get_attached_sas_address(iport, &prop->remote.sas_address);

	return SCI_SUCCESS;
}

static void sci_port_bcn_enable(struct isci_port *iport)
{
	struct isci_phy *iphy;
	u32 val;
	int i;

	for (i = 0; i < ARRAY_SIZE(iport->phy_table); i++) {
		iphy = iport->phy_table[i];
		if (!iphy)
			continue;
		val = readl(&iphy->link_layer_registers->link_layer_control);
		/* clear the bit by writing 1. */
		writel(val, &iphy->link_layer_registers->link_layer_control);
	}
}

/* called under sci_lock to stabilize phy:port associations */
void isci_port_bcn_enable(struct isci_host *ihost, struct isci_port *iport)
{
	int i;

	clear_bit(IPORT_BCN_BLOCKED, &iport->flags);
	wake_up(&ihost->eventq);

	if (!test_and_clear_bit(IPORT_BCN_PENDING, &iport->flags))
		return;

	for (i = 0; i < ARRAY_SIZE(iport->phy_table); i++) {
		struct isci_phy *iphy = iport->phy_table[i];

		if (!iphy)
			continue;

		ihost->sas_ha.notify_port_event(&iphy->sas_phy,
						PORTE_BROADCAST_RCVD);
		break;
	}
}

static void isci_port_bc_change_received(struct isci_host *ihost,
					 struct isci_port *iport,
					 struct isci_phy *iphy)
{
	if (iport && test_bit(IPORT_BCN_BLOCKED, &iport->flags)) {
		dev_dbg(&ihost->pdev->dev,
			"%s: disabled BCN; isci_phy = %p, sas_phy = %p\n",
			__func__, iphy, &iphy->sas_phy);
		set_bit(IPORT_BCN_PENDING, &iport->flags);
		atomic_inc(&iport->event);
		wake_up(&ihost->eventq);
	} else {
		dev_dbg(&ihost->pdev->dev,
			"%s: isci_phy = %p, sas_phy = %p\n",
			__func__, iphy, &iphy->sas_phy);

		ihost->sas_ha.notify_port_event(&iphy->sas_phy,
						PORTE_BROADCAST_RCVD);
	}
	sci_port_bcn_enable(iport);
}

static void isci_port_link_up(struct isci_host *isci_host,
			      struct isci_port *iport,
			      struct isci_phy *iphy)
{
	unsigned long flags;
	struct sci_port_properties properties;
	unsigned long success = true;

	BUG_ON(iphy->isci_port != NULL);

	iphy->isci_port = iport;

	dev_dbg(&isci_host->pdev->dev,
		"%s: isci_port = %p\n",
		__func__, iport);

	spin_lock_irqsave(&iphy->sas_phy.frame_rcvd_lock, flags);

	isci_port_change_state(iphy->isci_port, isci_starting);

	sci_port_get_properties(iport, &properties);

	if (iphy->protocol == SCIC_SDS_PHY_PROTOCOL_SATA) {
		u64 attached_sas_address;

		iphy->sas_phy.oob_mode = SATA_OOB_MODE;
		iphy->sas_phy.frame_rcvd_size = sizeof(struct dev_to_host_fis);

		/*
		 * For direct-attached SATA devices, the SCI core will
		 * automagically assign a SAS address to the end device
		 * for the purpose of creating a port. This SAS address
		 * will not be the same as assigned to the PHY and needs
		 * to be obtained from struct sci_port_properties properties.
		 */
		attached_sas_address = properties.remote.sas_address.high;
		attached_sas_address <<= 32;
		attached_sas_address |= properties.remote.sas_address.low;
		swab64s(&attached_sas_address);

		memcpy(&iphy->sas_phy.attached_sas_addr,
		       &attached_sas_address, sizeof(attached_sas_address));
	} else if (iphy->protocol == SCIC_SDS_PHY_PROTOCOL_SAS) {
		iphy->sas_phy.oob_mode = SAS_OOB_MODE;
		iphy->sas_phy.frame_rcvd_size = sizeof(struct sas_identify_frame);

		/* Copy the attached SAS address from the IAF */
		memcpy(iphy->sas_phy.attached_sas_addr,
		       iphy->frame_rcvd.iaf.sas_addr, SAS_ADDR_SIZE);
	} else {
		dev_err(&isci_host->pdev->dev, "%s: unkown target\n", __func__);
		success = false;
	}

	iphy->sas_phy.phy->negotiated_linkrate = sci_phy_linkrate(iphy);

	spin_unlock_irqrestore(&iphy->sas_phy.frame_rcvd_lock, flags);

	/* Notify libsas that we have an address frame, if indeed
	 * we've found an SSP, SMP, or STP target */
	if (success)
		isci_host->sas_ha.notify_port_event(&iphy->sas_phy,
						    PORTE_BYTES_DMAED);
}


/**
 * isci_port_link_down() - This function is called by the sci core when a link
 *    becomes inactive.
 * @isci_host: This parameter specifies the isci host object.
 * @phy: This parameter specifies the isci phy with the active link.
 * @port: This parameter specifies the isci port with the active link.
 *
 */
static void isci_port_link_down(struct isci_host *isci_host,
				struct isci_phy *isci_phy,
				struct isci_port *isci_port)
{
	struct isci_remote_device *isci_device;

	dev_dbg(&isci_host->pdev->dev,
		"%s: isci_port = %p\n", __func__, isci_port);

	if (isci_port) {

		/* check to see if this is the last phy on this port. */
		if (isci_phy->sas_phy.port &&
		    isci_phy->sas_phy.port->num_phys == 1) {
			atomic_inc(&isci_port->event);
			isci_port_bcn_enable(isci_host, isci_port);

			/* change the state for all devices on this port.  The
			 * next task sent to this device will be returned as
			 * SAS_TASK_UNDELIVERED, and the scsi mid layer will
			 * remove the target
			 */
			list_for_each_entry(isci_device,
					    &isci_port->remote_dev_list,
					    node) {
				dev_dbg(&isci_host->pdev->dev,
					"%s: isci_device = %p\n",
					__func__, isci_device);
				set_bit(IDEV_GONE, &isci_device->flags);
			}
		}
		isci_port_change_state(isci_port, isci_stopping);
	}

	/* Notify libsas of the borken link, this will trigger calls to our
	 * isci_port_deformed and isci_dev_gone functions.
	 */
	sas_phy_disconnected(&isci_phy->sas_phy);
	isci_host->sas_ha.notify_phy_event(&isci_phy->sas_phy,
					   PHYE_LOSS_OF_SIGNAL);

	isci_phy->isci_port = NULL;

	dev_dbg(&isci_host->pdev->dev,
		"%s: isci_port = %p - Done\n", __func__, isci_port);
}


/**
 * isci_port_ready() - This function is called by the sci core when a link
 *    becomes ready.
 * @isci_host: This parameter specifies the isci host object.
 * @port: This parameter specifies the sci port with the active link.
 *
 */
static void isci_port_ready(struct isci_host *isci_host, struct isci_port *isci_port)
{
	dev_dbg(&isci_host->pdev->dev,
		"%s: isci_port = %p\n", __func__, isci_port);

	complete_all(&isci_port->start_complete);
	isci_port_change_state(isci_port, isci_ready);
	return;
}

/**
 * isci_port_not_ready() - This function is called by the sci core when a link
 *    is not ready. All remote devices on this link will be removed if they are
 *    in the stopping state.
 * @isci_host: This parameter specifies the isci host object.
 * @port: This parameter specifies the sci port with the active link.
 *
 */
static void isci_port_not_ready(struct isci_host *isci_host, struct isci_port *isci_port)
{
	dev_dbg(&isci_host->pdev->dev,
		"%s: isci_port = %p\n", __func__, isci_port);
}

static void isci_port_stop_complete(struct isci_host *ihost,
				    struct isci_port *iport,
				    enum sci_status completion_status)
{
	dev_dbg(&ihost->pdev->dev, "Port stop complete\n");
}

/**
 * isci_port_hard_reset_complete() - This function is called by the sci core
 *    when the hard reset complete notification has been received.
 * @port: This parameter specifies the sci port with the active link.
 * @completion_status: This parameter specifies the core status for the reset
 *    process.
 *
 */
static void isci_port_hard_reset_complete(struct isci_port *isci_port,
					  enum sci_status completion_status)
{
	dev_dbg(&isci_port->isci_host->pdev->dev,
		"%s: isci_port = %p, completion_status=%x\n",
		     __func__, isci_port, completion_status);

	/* Save the status of the hard reset from the port. */
	isci_port->hard_reset_status = completion_status;

	complete_all(&isci_port->hard_reset_complete);
}

/* This method will return a true value if the specified phy can be assigned to
 * this port The following is a list of phys for each port that are allowed: -
 * Port 0 - 3 2 1 0 - Port 1 -     1 - Port 2 - 3 2 - Port 3 - 3 This method
 * doesn't preclude all configurations.  It merely ensures that a phy is part
 * of the allowable set of phy identifiers for that port.  For example, one
 * could assign phy 3 to port 0 and no other phys.  Please refer to
 * sci_port_is_phy_mask_valid() for information regarding whether the
 * phy_mask for a port can be supported. bool true if this is a valid phy
 * assignment for the port false if this is not a valid phy assignment for the
 * port
 */
bool sci_port_is_valid_phy_assignment(struct isci_port *iport, u32 phy_index)
{
	struct isci_host *ihost = iport->owning_controller;
	struct sci_user_parameters *user = &ihost->user_parameters;

	/* Initialize to invalid value. */
	u32 existing_phy_index = SCI_MAX_PHYS;
	u32 index;

	if ((iport->physical_port_index == 1) && (phy_index != 1))
		return false;

	if (iport->physical_port_index == 3 && phy_index != 3)
		return false;

	if (iport->physical_port_index == 2 &&
	    (phy_index == 0 || phy_index == 1))
		return false;

	for (index = 0; index < SCI_MAX_PHYS; index++)
		if (iport->phy_table[index] && index != phy_index)
			existing_phy_index = index;

	/* Ensure that all of the phys in the port are capable of
	 * operating at the same maximum link rate.
	 */
	if (existing_phy_index < SCI_MAX_PHYS &&
	    user->phys[phy_index].max_speed_generation !=
	    user->phys[existing_phy_index].max_speed_generation)
		return false;

	return true;
}

/**
 *
 * @sci_port: This is the port object for which to determine if the phy mask
 *    can be supported.
 *
 * This method will return a true value if the port's phy mask can be supported
 * by the SCU. The following is a list of valid PHY mask configurations for
 * each port: - Port 0 - [[3  2] 1] 0 - Port 1 -        [1] - Port 2 - [[3] 2]
 * - Port 3 -  [3] This method returns a boolean indication specifying if the
 * phy mask can be supported. true if this is a valid phy assignment for the
 * port false if this is not a valid phy assignment for the port
 */
static bool sci_port_is_phy_mask_valid(
	struct isci_port *iport,
	u32 phy_mask)
{
	if (iport->physical_port_index == 0) {
		if (((phy_mask & 0x0F) == 0x0F)
		    || ((phy_mask & 0x03) == 0x03)
		    || ((phy_mask & 0x01) == 0x01)
		    || (phy_mask == 0))
			return true;
	} else if (iport->physical_port_index == 1) {
		if (((phy_mask & 0x02) == 0x02)
		    || (phy_mask == 0))
			return true;
	} else if (iport->physical_port_index == 2) {
		if (((phy_mask & 0x0C) == 0x0C)
		    || ((phy_mask & 0x04) == 0x04)
		    || (phy_mask == 0))
			return true;
	} else if (iport->physical_port_index == 3) {
		if (((phy_mask & 0x08) == 0x08)
		    || (phy_mask == 0))
			return true;
	}

	return false;
}

/*
 * This method retrieves a currently active (i.e. connected) phy contained in
 * the port.  Currently, the lowest order phy that is connected is returned.
 * This method returns a pointer to a SCIS_SDS_PHY object. NULL This value is
 * returned if there are no currently active (i.e. connected to a remote end
 * point) phys contained in the port. All other values specify a struct sci_phy
 * object that is active in the port.
 */
static struct isci_phy *sci_port_get_a_connected_phy(struct isci_port *iport)
{
	u32 index;
	struct isci_phy *iphy;

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		/* Ensure that the phy is both part of the port and currently
		 * connected to the remote end-point.
		 */
		iphy = iport->phy_table[index];
		if (iphy && sci_port_active_phy(iport, iphy))
			return iphy;
	}

	return NULL;
}

static enum sci_status sci_port_set_phy(struct isci_port *iport, struct isci_phy *iphy)
{
	/* Check to see if we can add this phy to a port
	 * that means that the phy is not part of a port and that the port does
	 * not already have a phy assinged to the phy index.
	 */
	if (!iport->phy_table[iphy->phy_index] &&
	    !phy_get_non_dummy_port(iphy) &&
	    sci_port_is_valid_phy_assignment(iport, iphy->phy_index)) {
		/* Phy is being added in the stopped state so we are in MPC mode
		 * make logical port index = physical port index
		 */
		iport->logical_port_index = iport->physical_port_index;
		iport->phy_table[iphy->phy_index] = iphy;
		sci_phy_set_port(iphy, iport);

		return SCI_SUCCESS;
	}

	return SCI_FAILURE;
}

static enum sci_status sci_port_clear_phy(struct isci_port *iport, struct isci_phy *iphy)
{
	/* Make sure that this phy is part of this port */
	if (iport->phy_table[iphy->phy_index] == iphy &&
	    phy_get_non_dummy_port(iphy) == iport) {
		struct isci_host *ihost = iport->owning_controller;

		/* Yep it is assigned to this port so remove it */
		sci_phy_set_port(iphy, &ihost->ports[SCI_MAX_PORTS]);
		iport->phy_table[iphy->phy_index] = NULL;
		return SCI_SUCCESS;
	}

	return SCI_FAILURE;
}

void sci_port_get_sas_address(struct isci_port *iport, struct sci_sas_address *sas)
{
	u32 index;

	sas->high = 0;
	sas->low  = 0;
	for (index = 0; index < SCI_MAX_PHYS; index++)
		if (iport->phy_table[index])
			sci_phy_get_sas_address(iport->phy_table[index], sas);
}

void sci_port_get_attached_sas_address(struct isci_port *iport, struct sci_sas_address *sas)
{
	struct isci_phy *iphy;

	/*
	 * Ensure that the phy is both part of the port and currently
	 * connected to the remote end-point.
	 */
	iphy = sci_port_get_a_connected_phy(iport);
	if (iphy) {
		if (iphy->protocol != SCIC_SDS_PHY_PROTOCOL_SATA) {
			sci_phy_get_attached_sas_address(iphy, sas);
		} else {
			sci_phy_get_sas_address(iphy, sas);
			sas->low += iphy->phy_index;
		}
	} else {
		sas->high = 0;
		sas->low  = 0;
	}
}

/**
 * sci_port_construct_dummy_rnc() - create dummy rnc for si workaround
 *
 * @sci_port: logical port on which we need to create the remote node context
 * @rni: remote node index for this remote node context.
 *
 * This routine will construct a dummy remote node context data structure
 * This structure will be posted to the hardware to work around a scheduler
 * error in the hardware.
 */
static void sci_port_construct_dummy_rnc(struct isci_port *iport, u16 rni)
{
	union scu_remote_node_context *rnc;

	rnc = &iport->owning_controller->remote_node_context_table[rni];

	memset(rnc, 0, sizeof(union scu_remote_node_context));

	rnc->ssp.remote_sas_address_hi = 0;
	rnc->ssp.remote_sas_address_lo = 0;

	rnc->ssp.remote_node_index = rni;
	rnc->ssp.remote_node_port_width = 1;
	rnc->ssp.logical_port_index = iport->physical_port_index;

	rnc->ssp.nexus_loss_timer_enable = false;
	rnc->ssp.check_bit = false;
	rnc->ssp.is_valid = true;
	rnc->ssp.is_remote_node_context = true;
	rnc->ssp.function_number = 0;
	rnc->ssp.arbitration_wait_time = 0;
}

/*
 * construct a dummy task context data structure.  This
 * structure will be posted to the hardwre to work around a scheduler error
 * in the hardware.
 */
static void sci_port_construct_dummy_task(struct isci_port *iport, u16 tag)
{
	struct isci_host *ihost = iport->owning_controller;
	struct scu_task_context *task_context;

	task_context = &ihost->task_context_table[ISCI_TAG_TCI(tag)];
	memset(task_context, 0, sizeof(struct scu_task_context));

	task_context->initiator_request = 1;
	task_context->connection_rate = 1;
	task_context->logical_port_index = iport->physical_port_index;
	task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
	task_context->task_index = ISCI_TAG_TCI(tag);
	task_context->valid = SCU_TASK_CONTEXT_VALID;
	task_context->context_type = SCU_TASK_CONTEXT_TYPE;
	task_context->remote_node_index = iport->reserved_rni;
	task_context->do_not_dma_ssp_good_response = 1;
	task_context->task_phase = 0x01;
}

static void sci_port_destroy_dummy_resources(struct isci_port *iport)
{
	struct isci_host *ihost = iport->owning_controller;

	if (iport->reserved_tag != SCI_CONTROLLER_INVALID_IO_TAG)
		isci_free_tag(ihost, iport->reserved_tag);

	if (iport->reserved_rni != SCU_DUMMY_INDEX)
		sci_remote_node_table_release_remote_node_index(&ihost->available_remote_nodes,
								     1, iport->reserved_rni);

	iport->reserved_rni = SCU_DUMMY_INDEX;
	iport->reserved_tag = SCI_CONTROLLER_INVALID_IO_TAG;
}

void sci_port_setup_transports(struct isci_port *iport, u32 device_id)
{
	u8 index;

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if (iport->active_phy_mask & (1 << index))
			sci_phy_setup_transport(iport->phy_table[index], device_id);
	}
}

static void sci_port_activate_phy(struct isci_port *iport, struct isci_phy *iphy,
				  bool do_notify_user)
{
	struct isci_host *ihost = iport->owning_controller;

	if (iphy->protocol != SCIC_SDS_PHY_PROTOCOL_SATA)
		sci_phy_resume(iphy);

	iport->active_phy_mask |= 1 << iphy->phy_index;

	sci_controller_clear_invalid_phy(ihost, iphy);

	if (do_notify_user == true)
		isci_port_link_up(ihost, iport, iphy);
}

void sci_port_deactivate_phy(struct isci_port *iport, struct isci_phy *iphy,
			     bool do_notify_user)
{
	struct isci_host *ihost = iport->owning_controller;

	iport->active_phy_mask &= ~(1 << iphy->phy_index);

	iphy->max_negotiated_speed = SAS_LINK_RATE_UNKNOWN;

	/* Re-assign the phy back to the LP as if it were a narrow port */
	writel(iphy->phy_index,
		&iport->port_pe_configuration_register[iphy->phy_index]);

	if (do_notify_user == true)
		isci_port_link_down(ihost, iphy, iport);
}

static void sci_port_invalid_link_up(struct isci_port *iport, struct isci_phy *iphy)
{
	struct isci_host *ihost = iport->owning_controller;

	/*
	 * Check to see if we have alreay reported this link as bad and if
	 * not go ahead and tell the SCI_USER that we have discovered an
	 * invalid link.
	 */
	if ((ihost->invalid_phy_mask & (1 << iphy->phy_index)) == 0) {
		ihost->invalid_phy_mask |= 1 << iphy->phy_index;
		dev_warn(&ihost->pdev->dev, "Invalid link up!\n");
	}
}

static bool is_port_ready_state(enum sci_port_states state)
{
	switch (state) {
	case SCI_PORT_READY:
	case SCI_PORT_SUB_WAITING:
	case SCI_PORT_SUB_OPERATIONAL:
	case SCI_PORT_SUB_CONFIGURING:
		return true;
	default:
		return false;
	}
}

/* flag dummy rnc hanling when exiting a ready state */
static void port_state_machine_change(struct isci_port *iport,
				      enum sci_port_states state)
{
	struct sci_base_state_machine *sm = &iport->sm;
	enum sci_port_states old_state = sm->current_state_id;

	if (is_port_ready_state(old_state) && !is_port_ready_state(state))
		iport->ready_exit = true;

	sci_change_state(sm, state);
	iport->ready_exit = false;
}

/**
 * sci_port_general_link_up_handler - phy can be assigned to port?
 * @sci_port: sci_port object for which has a phy that has gone link up.
 * @sci_phy: This is the struct isci_phy object that has gone link up.
 * @do_notify_user: This parameter specifies whether to inform the user (via
 *    sci_port_link_up()) as to the fact that a new phy as become ready.
 *
 * Determine if this phy can be assigned to this
 * port . If the phy is not a valid PHY for
 * this port then the function will notify the user. A PHY can only be
 * part of a port if it's attached SAS ADDRESS is the same as all other PHYs in
 * the same port. none
 */
static void sci_port_general_link_up_handler(struct isci_port *iport,
						  struct isci_phy *iphy,
						  bool do_notify_user)
{
	struct sci_sas_address port_sas_address;
	struct sci_sas_address phy_sas_address;

	sci_port_get_attached_sas_address(iport, &port_sas_address);
	sci_phy_get_attached_sas_address(iphy, &phy_sas_address);

	/* If the SAS address of the new phy matches the SAS address of
	 * other phys in the port OR this is the first phy in the port,
	 * then activate the phy and allow it to be used for operations
	 * in this port.
	 */
	if ((phy_sas_address.high == port_sas_address.high &&
	     phy_sas_address.low  == port_sas_address.low) ||
	    iport->active_phy_mask == 0) {
		struct sci_base_state_machine *sm = &iport->sm;

		sci_port_activate_phy(iport, iphy, do_notify_user);
		if (sm->current_state_id == SCI_PORT_RESETTING)
			port_state_machine_change(iport, SCI_PORT_READY);
	} else
		sci_port_invalid_link_up(iport, iphy);
}



/**
 * This method returns false if the port only has a single phy object assigned.
 *     If there are no phys or more than one phy then the method will return
 *    true.
 * @sci_port: The port for which the wide port condition is to be checked.
 *
 * bool true Is returned if this is a wide ported port. false Is returned if
 * this is a narrow port.
 */
static bool sci_port_is_wide(struct isci_port *iport)
{
	u32 index;
	u32 phy_count = 0;

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if (iport->phy_table[index] != NULL) {
			phy_count++;
		}
	}

	return phy_count != 1;
}

/**
 * This method is called by the PHY object when the link is detected. if the
 *    port wants the PHY to continue on to the link up state then the port
 *    layer must return true.  If the port object returns false the phy object
 *    must halt its attempt to go link up.
 * @sci_port: The port associated with the phy object.
 * @sci_phy: The phy object that is trying to go link up.
 *
 * true if the phy object can continue to the link up condition. true Is
 * returned if this phy can continue to the ready state. false Is returned if
 * can not continue on to the ready state. This notification is in place for
 * wide ports and direct attached phys.  Since there are no wide ported SATA
 * devices this could become an invalid port configuration.
 */
bool sci_port_link_detected(
	struct isci_port *iport,
	struct isci_phy *iphy)
{
	if ((iport->logical_port_index != SCIC_SDS_DUMMY_PORT) &&
	    (iphy->protocol == SCIC_SDS_PHY_PROTOCOL_SATA) &&
	    sci_port_is_wide(iport)) {
		sci_port_invalid_link_up(iport, iphy);

		return false;
	}

	return true;
}

static void port_timeout(unsigned long data)
{
	struct sci_timer *tmr = (struct sci_timer *)data;
	struct isci_port *iport = container_of(tmr, typeof(*iport), timer);
	struct isci_host *ihost = iport->owning_controller;
	unsigned long flags;
	u32 current_state;

	spin_lock_irqsave(&ihost->scic_lock, flags);

	if (tmr->cancel)
		goto done;

	current_state = iport->sm.current_state_id;

	if (current_state == SCI_PORT_RESETTING) {
		/* if the port is still in the resetting state then the timeout
		 * fired before the reset completed.
		 */
		port_state_machine_change(iport, SCI_PORT_FAILED);
	} else if (current_state == SCI_PORT_STOPPED) {
		/* if the port is stopped then the start request failed In this
		 * case stay in the stopped state.
		 */
		dev_err(sciport_to_dev(iport),
			"%s: SCIC Port 0x%p failed to stop before tiemout.\n",
			__func__,
			iport);
	} else if (current_state == SCI_PORT_STOPPING) {
		/* if the port is still stopping then the stop has not completed */
		isci_port_stop_complete(iport->owning_controller,
					iport,
					SCI_FAILURE_TIMEOUT);
	} else {
		/* The port is in the ready state and we have a timer
		 * reporting a timeout this should not happen.
		 */
		dev_err(sciport_to_dev(iport),
			"%s: SCIC Port 0x%p is processing a timeout operation "
			"in state %d.\n", __func__, iport, current_state);
	}

done:
	spin_unlock_irqrestore(&ihost->scic_lock, flags);
}

/* --------------------------------------------------------------------------- */

/**
 * This function updates the hardwares VIIT entry for this port.
 *
 *
 */
static void sci_port_update_viit_entry(struct isci_port *iport)
{
	struct sci_sas_address sas_address;

	sci_port_get_sas_address(iport, &sas_address);

	writel(sas_address.high,
		&iport->viit_registers->initiator_sas_address_hi);
	writel(sas_address.low,
		&iport->viit_registers->initiator_sas_address_lo);

	/* This value get cleared just in case its not already cleared */
	writel(0, &iport->viit_registers->reserved);

	/* We are required to update the status register last */
	writel(SCU_VIIT_ENTRY_ID_VIIT |
	       SCU_VIIT_IPPT_INITIATOR |
	       ((1 << iport->physical_port_index) << SCU_VIIT_ENTRY_LPVIE_SHIFT) |
	       SCU_VIIT_STATUS_ALL_VALID,
	       &iport->viit_registers->status);
}

enum sas_linkrate sci_port_get_max_allowed_speed(struct isci_port *iport)
{
	u16 index;
	struct isci_phy *iphy;
	enum sas_linkrate max_allowed_speed = SAS_LINK_RATE_6_0_GBPS;

	/*
	 * Loop through all of the phys in this port and find the phy with the
	 * lowest maximum link rate. */
	for (index = 0; index < SCI_MAX_PHYS; index++) {
		iphy = iport->phy_table[index];
		if (iphy && sci_port_active_phy(iport, iphy) &&
		    iphy->max_negotiated_speed < max_allowed_speed)
			max_allowed_speed = iphy->max_negotiated_speed;
	}

	return max_allowed_speed;
}

static void sci_port_suspend_port_task_scheduler(struct isci_port *iport)
{
	u32 pts_control_value;

	pts_control_value = readl(&iport->port_task_scheduler_registers->control);
	pts_control_value |= SCU_PTSxCR_GEN_BIT(SUSPEND);
	writel(pts_control_value, &iport->port_task_scheduler_registers->control);
}

/**
 * sci_port_post_dummy_request() - post dummy/workaround request
 * @sci_port: port to post task
 *
 * Prevent the hardware scheduler from posting new requests to the front
 * of the scheduler queue causing a starvation problem for currently
 * ongoing requests.
 *
 */
static void sci_port_post_dummy_request(struct isci_port *iport)
{
	struct isci_host *ihost = iport->owning_controller;
	u16 tag = iport->reserved_tag;
	struct scu_task_context *tc;
	u32 command;

	tc = &ihost->task_context_table[ISCI_TAG_TCI(tag)];
	tc->abort = 0;

	command = SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
		  iport->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
		  ISCI_TAG_TCI(tag);

	sci_controller_post_request(ihost, command);
}

/**
 * This routine will abort the dummy request.  This will alow the hardware to
 * power down parts of the silicon to save power.
 *
 * @sci_port: The port on which the task must be aborted.
 *
 */
static void sci_port_abort_dummy_request(struct isci_port *iport)
{
	struct isci_host *ihost = iport->owning_controller;
	u16 tag = iport->reserved_tag;
	struct scu_task_context *tc;
	u32 command;

	tc = &ihost->task_context_table[ISCI_TAG_TCI(tag)];
	tc->abort = 1;

	command = SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT |
		  iport->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
		  ISCI_TAG_TCI(tag);

	sci_controller_post_request(ihost, command);
}

/**
 *
 * @sci_port: This is the struct isci_port object to resume.
 *
 * This method will resume the port task scheduler for this port object. none
 */
static void
sci_port_resume_port_task_scheduler(struct isci_port *iport)
{
	u32 pts_control_value;

	pts_control_value = readl(&iport->port_task_scheduler_registers->control);
	pts_control_value &= ~SCU_PTSxCR_GEN_BIT(SUSPEND);
	writel(pts_control_value, &iport->port_task_scheduler_registers->control);
}

static void sci_port_ready_substate_waiting_enter(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);

	sci_port_suspend_port_task_scheduler(iport);

	iport->not_ready_reason = SCIC_PORT_NOT_READY_NO_ACTIVE_PHYS;

	if (iport->active_phy_mask != 0) {
		/* At least one of the phys on the port is ready */
		port_state_machine_change(iport,
					  SCI_PORT_SUB_OPERATIONAL);
	}
}

static void sci_port_ready_substate_operational_enter(struct sci_base_state_machine *sm)
{
	u32 index;
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);
	struct isci_host *ihost = iport->owning_controller;

	isci_port_ready(ihost, iport);

	for (index = 0; index < SCI_MAX_PHYS; index++) {
		if (iport->phy_table[index]) {
			writel(iport->physical_port_index,
				&iport->port_pe_configuration_register[
					iport->phy_table[index]->phy_index]);
		}
	}

	sci_port_update_viit_entry(iport);

	sci_port_resume_port_task_scheduler(iport);

	/*
	 * Post the dummy task for the port so the hardware can schedule
	 * io correctly
	 */
	sci_port_post_dummy_request(iport);
}

static void sci_port_invalidate_dummy_remote_node(struct isci_port *iport)
{
	struct isci_host *ihost = iport->owning_controller;
	u8 phys_index = iport->physical_port_index;
	union scu_remote_node_context *rnc;
	u16 rni = iport->reserved_rni;
	u32 command;

	rnc = &ihost->remote_node_context_table[rni];

	rnc->ssp.is_valid = false;

	/* ensure the preceding tc abort request has reached the
	 * controller and give it ample time to act before posting the rnc
	 * invalidate
	 */
	readl(&ihost->smu_registers->interrupt_status); /* flush */
	udelay(10);

	command = SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE |
		  phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;

	sci_controller_post_request(ihost, command);
}

/**
 *
 * @object: This is the object which is cast to a struct isci_port object.
 *
 * This method will perform the actions required by the struct isci_port on
 * exiting the SCI_PORT_SUB_OPERATIONAL. This function reports
 * the port not ready and suspends the port task scheduler. none
 */
static void sci_port_ready_substate_operational_exit(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);
	struct isci_host *ihost = iport->owning_controller;

	/*
	 * Kill the dummy task for this port if it has not yet posted
	 * the hardware will treat this as a NOP and just return abort
	 * complete.
	 */
	sci_port_abort_dummy_request(iport);

	isci_port_not_ready(ihost, iport);

	if (iport->ready_exit)
		sci_port_invalidate_dummy_remote_node(iport);
}

static void sci_port_ready_substate_configuring_enter(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);
	struct isci_host *ihost = iport->owning_controller;

	if (iport->active_phy_mask == 0) {
		isci_port_not_ready(ihost, iport);

		port_state_machine_change(iport,
					  SCI_PORT_SUB_WAITING);
	} else if (iport->started_request_count == 0)
		port_state_machine_change(iport,
					  SCI_PORT_SUB_OPERATIONAL);
}

static void sci_port_ready_substate_configuring_exit(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);

	sci_port_suspend_port_task_scheduler(iport);
	if (iport->ready_exit)
		sci_port_invalidate_dummy_remote_node(iport);
}

enum sci_status sci_port_start(struct isci_port *iport)
{
	struct isci_host *ihost = iport->owning_controller;
	enum sci_status status = SCI_SUCCESS;
	enum sci_port_states state;
	u32 phy_mask;

	state = iport->sm.current_state_id;
	if (state != SCI_PORT_STOPPED) {
		dev_warn(sciport_to_dev(iport),
			 "%s: in wrong state: %d\n", __func__, state);
		return SCI_FAILURE_INVALID_STATE;
	}

	if (iport->assigned_device_count > 0) {
		/* TODO This is a start failure operation because
		 * there are still devices assigned to this port.
		 * There must be no devices assigned to a port on a
		 * start operation.
		 */
		return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
	}

	if (iport->reserved_rni == SCU_DUMMY_INDEX) {
		u16 rni = sci_remote_node_table_allocate_remote_node(
				&ihost->available_remote_nodes, 1);

		if (rni != SCU_DUMMY_INDEX)
			sci_port_construct_dummy_rnc(iport, rni);
		else
			status = SCI_FAILURE_INSUFFICIENT_RESOURCES;
		iport->reserved_rni = rni;
	}

	if (iport->reserved_tag == SCI_CONTROLLER_INVALID_IO_TAG) {
		u16 tag;

		tag = isci_alloc_tag(ihost);
		if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
			status = SCI_FAILURE_INSUFFICIENT_RESOURCES;
		else
			sci_port_construct_dummy_task(iport, tag);
		iport->reserved_tag = tag;
	}

	if (status == SCI_SUCCESS) {
		phy_mask = sci_port_get_phys(iport);

		/*
		 * There are one or more phys assigned to this port.  Make sure
		 * the port's phy mask is in fact legal and supported by the
		 * silicon.
		 */
		if (sci_port_is_phy_mask_valid(iport, phy_mask) == true) {
			port_state_machine_change(iport,
						  SCI_PORT_READY);

			return SCI_SUCCESS;
		}
		status = SCI_FAILURE;
	}

	if (status != SCI_SUCCESS)
		sci_port_destroy_dummy_resources(iport);

	return status;
}

enum sci_status sci_port_stop(struct isci_port *iport)
{
	enum sci_port_states state;

	state = iport->sm.current_state_id;
	switch (state) {
	case SCI_PORT_STOPPED:
		return SCI_SUCCESS;
	case SCI_PORT_SUB_WAITING:
	case SCI_PORT_SUB_OPERATIONAL:
	case SCI_PORT_SUB_CONFIGURING:
	case SCI_PORT_RESETTING:
		port_state_machine_change(iport,
					  SCI_PORT_STOPPING);
		return SCI_SUCCESS;
	default:
		dev_warn(sciport_to_dev(iport),
			 "%s: in wrong state: %d\n", __func__, state);
		return SCI_FAILURE_INVALID_STATE;
	}
}

static enum sci_status sci_port_hard_reset(struct isci_port *iport, u32 timeout)
{
	enum sci_status status = SCI_FAILURE_INVALID_PHY;
	struct isci_phy *iphy = NULL;
	enum sci_port_states state;
	u32 phy_index;

	state = iport->sm.current_state_id;
	if (state != SCI_PORT_SUB_OPERATIONAL) {
		dev_warn(sciport_to_dev(iport),
			 "%s: in wrong state: %d\n", __func__, state);
		return SCI_FAILURE_INVALID_STATE;
	}

	/* Select a phy on which we can send the hard reset request. */
	for (phy_index = 0; phy_index < SCI_MAX_PHYS && !iphy; phy_index++) {
		iphy = iport->phy_table[phy_index];
		if (iphy && !sci_port_active_phy(iport, iphy)) {
			/*
			 * We found a phy but it is not ready select
			 * different phy
			 */
			iphy = NULL;
		}
	}

	/* If we have a phy then go ahead and start the reset procedure */
	if (!iphy)
		return status;
	status = sci_phy_reset(iphy);

	if (status != SCI_SUCCESS)
		return status;

	sci_mod_timer(&iport->timer, timeout);
	iport->not_ready_reason = SCIC_PORT_NOT_READY_HARD_RESET_REQUESTED;

	port_state_machine_change(iport, SCI_PORT_RESETTING);
	return SCI_SUCCESS;
}

/**
 * sci_port_add_phy() -
 * @sci_port: This parameter specifies the port in which the phy will be added.
 * @sci_phy: This parameter is the phy which is to be added to the port.
 *
 * This method will add a PHY to the selected port. This method returns an
 * enum sci_status. SCI_SUCCESS the phy has been added to the port. Any other
 * status is a failure to add the phy to the port.
 */
enum sci_status sci_port_add_phy(struct isci_port *iport,
				      struct isci_phy *iphy)
{
	enum sci_status status;
	enum sci_port_states state;

	state = iport->sm.current_state_id;
	switch (state) {
	case SCI_PORT_STOPPED: {
		struct sci_sas_address port_sas_address;

		/* Read the port assigned SAS Address if there is one */
		sci_port_get_sas_address(iport, &port_sas_address);

		if (port_sas_address.high != 0 && port_sas_address.low != 0) {
			struct sci_sas_address phy_sas_address;

			/* Make sure that the PHY SAS Address matches the SAS Address
			 * for this port
			 */
			sci_phy_get_sas_address(iphy, &phy_sas_address);

			if (port_sas_address.high != phy_sas_address.high ||
			    port_sas_address.low  != phy_sas_address.low)
				return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
		}
		return sci_port_set_phy(iport, iphy);
	}
	case SCI_PORT_SUB_WAITING:
	case SCI_PORT_SUB_OPERATIONAL:
		status = sci_port_set_phy(iport, iphy);

		if (status != SCI_SUCCESS)
			return status;

		sci_port_general_link_up_handler(iport, iphy, true);
		iport->not_ready_reason = SCIC_PORT_NOT_READY_RECONFIGURING;
		port_state_machine_change(iport, SCI_PORT_SUB_CONFIGURING);

		return status;
	case SCI_PORT_SUB_CONFIGURING:
		status = sci_port_set_phy(iport, iphy);

		if (status != SCI_SUCCESS)
			return status;
		sci_port_general_link_up_handler(iport, iphy, true);

		/* Re-enter the configuring state since this may be the last phy in
		 * the port.
		 */
		port_state_machine_change(iport,
					  SCI_PORT_SUB_CONFIGURING);
		return SCI_SUCCESS;
	default:
		dev_warn(sciport_to_dev(iport),
			 "%s: in wrong state: %d\n", __func__, state);
		return SCI_FAILURE_INVALID_STATE;
	}
}

/**
 * sci_port_remove_phy() -
 * @sci_port: This parameter specifies the port in which the phy will be added.
 * @sci_phy: This parameter is the phy which is to be added to the port.
 *
 * This method will remove the PHY from the selected PORT. This method returns
 * an enum sci_status. SCI_SUCCESS the phy has been removed from the port. Any
 * other status is a failure to add the phy to the port.
 */
enum sci_status sci_port_remove_phy(struct isci_port *iport,
					 struct isci_phy *iphy)
{
	enum sci_status status;
	enum sci_port_states state;

	state = iport->sm.current_state_id;

	switch (state) {
	case SCI_PORT_STOPPED:
		return sci_port_clear_phy(iport, iphy);
	case SCI_PORT_SUB_OPERATIONAL:
		status = sci_port_clear_phy(iport, iphy);
		if (status != SCI_SUCCESS)
			return status;

		sci_port_deactivate_phy(iport, iphy, true);
		iport->not_ready_reason = SCIC_PORT_NOT_READY_RECONFIGURING;
		port_state_machine_change(iport,
					  SCI_PORT_SUB_CONFIGURING);
		return SCI_SUCCESS;
	case SCI_PORT_SUB_CONFIGURING:
		status = sci_port_clear_phy(iport, iphy);

		if (status != SCI_SUCCESS)
			return status;
		sci_port_deactivate_phy(iport, iphy, true);

		/* Re-enter the configuring state since this may be the last phy in
		 * the port
		 */
		port_state_machine_change(iport,
					  SCI_PORT_SUB_CONFIGURING);
		return SCI_SUCCESS;
	default:
		dev_warn(sciport_to_dev(iport),
			 "%s: in wrong state: %d\n", __func__, state);
		return SCI_FAILURE_INVALID_STATE;
	}
}

enum sci_status sci_port_link_up(struct isci_port *iport,
				      struct isci_phy *iphy)
{
	enum sci_port_states state;

	state = iport->sm.current_state_id;
	switch (state) {
	case SCI_PORT_SUB_WAITING:
		/* Since this is the first phy going link up for the port we
		 * can just enable it and continue
		 */
		sci_port_activate_phy(iport, iphy, true);

		port_state_machine_change(iport,
					  SCI_PORT_SUB_OPERATIONAL);
		return SCI_SUCCESS;
	case SCI_PORT_SUB_OPERATIONAL:
		sci_port_general_link_up_handler(iport, iphy, true);
		return SCI_SUCCESS;
	case SCI_PORT_RESETTING:
		/* TODO We should  make  sure  that  the phy  that  has gone
		 * link up is the same one on which we sent the reset.  It is
		 * possible that the phy on which we sent  the reset is not the
		 * one that has  gone  link up  and we  want to make sure that
		 * phy being reset  comes  back.  Consider the case where a
		 * reset is sent but before the hardware processes the reset it
		 * get a link up on  the  port because of a hot plug event.
		 * because  of  the reset request this phy will go link down
		 * almost immediately.
		 */

		/* In the resetting state we don't notify the user regarding
		 * link up and link down notifications.
		 */
		sci_port_general_link_up_handler(iport, iphy, false);
		return SCI_SUCCESS;
	default:
		dev_warn(sciport_to_dev(iport),
			 "%s: in wrong state: %d\n", __func__, state);
		return SCI_FAILURE_INVALID_STATE;
	}
}

enum sci_status sci_port_link_down(struct isci_port *iport,
					struct isci_phy *iphy)
{
	enum sci_port_states state;

	state = iport->sm.current_state_id;
	switch (state) {
	case SCI_PORT_SUB_OPERATIONAL:
		sci_port_deactivate_phy(iport, iphy, true);

		/* If there are no active phys left in the port, then
		 * transition the port to the WAITING state until such time
		 * as a phy goes link up
		 */
		if (iport->active_phy_mask == 0)
			port_state_machine_change(iport,
						  SCI_PORT_SUB_WAITING);
		return SCI_SUCCESS;
	case SCI_PORT_RESETTING:
		/* In the resetting state we don't notify the user regarding
		 * link up and link down notifications. */
		sci_port_deactivate_phy(iport, iphy, false);
		return SCI_SUCCESS;
	default:
		dev_warn(sciport_to_dev(iport),
			 "%s: in wrong state: %d\n", __func__, state);
		return SCI_FAILURE_INVALID_STATE;
	}
}

enum sci_status sci_port_start_io(struct isci_port *iport,
				  struct isci_remote_device *idev,
				  struct isci_request *ireq)
{
	enum sci_port_states state;

	state = iport->sm.current_state_id;
	switch (state) {
	case SCI_PORT_SUB_WAITING:
		return SCI_FAILURE_INVALID_STATE;
	case SCI_PORT_SUB_OPERATIONAL:
		iport->started_request_count++;
		return SCI_SUCCESS;
	default:
		dev_warn(sciport_to_dev(iport),
			 "%s: in wrong state: %d\n", __func__, state);
		return SCI_FAILURE_INVALID_STATE;
	}
}

enum sci_status sci_port_complete_io(struct isci_port *iport,
				     struct isci_remote_device *idev,
				     struct isci_request *ireq)
{
	enum sci_port_states state;

	state = iport->sm.current_state_id;
	switch (state) {
	case SCI_PORT_STOPPED:
		dev_warn(sciport_to_dev(iport),
			 "%s: in wrong state: %d\n", __func__, state);
		return SCI_FAILURE_INVALID_STATE;
	case SCI_PORT_STOPPING:
		sci_port_decrement_request_count(iport);

		if (iport->started_request_count == 0)
			port_state_machine_change(iport,
						  SCI_PORT_STOPPED);
		break;
	case SCI_PORT_READY:
	case SCI_PORT_RESETTING:
	case SCI_PORT_FAILED:
	case SCI_PORT_SUB_WAITING:
	case SCI_PORT_SUB_OPERATIONAL:
		sci_port_decrement_request_count(iport);
		break;
	case SCI_PORT_SUB_CONFIGURING:
		sci_port_decrement_request_count(iport);
		if (iport->started_request_count == 0) {
			port_state_machine_change(iport,
						  SCI_PORT_SUB_OPERATIONAL);
		}
		break;
	}
	return SCI_SUCCESS;
}

static void sci_port_enable_port_task_scheduler(struct isci_port *iport)
{
	u32 pts_control_value;

	 /* enable the port task scheduler in a suspended state */
	pts_control_value = readl(&iport->port_task_scheduler_registers->control);
	pts_control_value |= SCU_PTSxCR_GEN_BIT(ENABLE) | SCU_PTSxCR_GEN_BIT(SUSPEND);
	writel(pts_control_value, &iport->port_task_scheduler_registers->control);
}

static void sci_port_disable_port_task_scheduler(struct isci_port *iport)
{
	u32 pts_control_value;

	pts_control_value = readl(&iport->port_task_scheduler_registers->control);
	pts_control_value &=
		~(SCU_PTSxCR_GEN_BIT(ENABLE) | SCU_PTSxCR_GEN_BIT(SUSPEND));
	writel(pts_control_value, &iport->port_task_scheduler_registers->control);
}

static void sci_port_post_dummy_remote_node(struct isci_port *iport)
{
	struct isci_host *ihost = iport->owning_controller;
	u8 phys_index = iport->physical_port_index;
	union scu_remote_node_context *rnc;
	u16 rni = iport->reserved_rni;
	u32 command;

	rnc = &ihost->remote_node_context_table[rni];
	rnc->ssp.is_valid = true;

	command = SCU_CONTEXT_COMMAND_POST_RNC_32 |
		  phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;

	sci_controller_post_request(ihost, command);

	/* ensure hardware has seen the post rnc command and give it
	 * ample time to act before sending the suspend
	 */
	readl(&ihost->smu_registers->interrupt_status); /* flush */
	udelay(10);

	command = SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX_RX |
		  phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;

	sci_controller_post_request(ihost, command);
}

static void sci_port_stopped_state_enter(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);

	if (iport->sm.previous_state_id == SCI_PORT_STOPPING) {
		/*
		 * If we enter this state becasuse of a request to stop
		 * the port then we want to disable the hardwares port
		 * task scheduler. */
		sci_port_disable_port_task_scheduler(iport);
	}
}

static void sci_port_stopped_state_exit(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);

	/* Enable and suspend the port task scheduler */
	sci_port_enable_port_task_scheduler(iport);
}

static void sci_port_ready_state_enter(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);
	struct isci_host *ihost = iport->owning_controller;
	u32 prev_state;

	prev_state = iport->sm.previous_state_id;
	if (prev_state  == SCI_PORT_RESETTING)
		isci_port_hard_reset_complete(iport, SCI_SUCCESS);
	else
		isci_port_not_ready(ihost, iport);

	/* Post and suspend the dummy remote node context for this port. */
	sci_port_post_dummy_remote_node(iport);

	/* Start the ready substate machine */
	port_state_machine_change(iport,
				  SCI_PORT_SUB_WAITING);
}

static void sci_port_resetting_state_exit(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);

	sci_del_timer(&iport->timer);
}

static void sci_port_stopping_state_exit(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);

	sci_del_timer(&iport->timer);

	sci_port_destroy_dummy_resources(iport);
}

static void sci_port_failed_state_enter(struct sci_base_state_machine *sm)
{
	struct isci_port *iport = container_of(sm, typeof(*iport), sm);

	isci_port_hard_reset_complete(iport, SCI_FAILURE_TIMEOUT);
}

/* --------------------------------------------------------------------------- */

static const struct sci_base_state sci_port_state_table[] = {
	[SCI_PORT_STOPPED] = {
		.enter_state = sci_port_stopped_state_enter,
		.exit_state  = sci_port_stopped_state_exit
	},
	[SCI_PORT_STOPPING] = {
		.exit_state  = sci_port_stopping_state_exit
	},
	[SCI_PORT_READY] = {
		.enter_state = sci_port_ready_state_enter,
	},
	[SCI_PORT_SUB_WAITING] = {
		.enter_state = sci_port_ready_substate_waiting_enter,
	},
	[SCI_PORT_SUB_OPERATIONAL] = {
		.enter_state = sci_port_ready_substate_operational_enter,
		.exit_state  = sci_port_ready_substate_operational_exit
	},
	[SCI_PORT_SUB_CONFIGURING] = {
		.enter_state = sci_port_ready_substate_configuring_enter,
		.exit_state  = sci_port_ready_substate_configuring_exit
	},
	[SCI_PORT_RESETTING] = {
		.exit_state  = sci_port_resetting_state_exit
	},
	[SCI_PORT_FAILED] = {
		.enter_state = sci_port_failed_state_enter,
	}
};

void sci_port_construct(struct isci_port *iport, u8 index,
			     struct isci_host *ihost)
{
	sci_init_sm(&iport->sm, sci_port_state_table, SCI_PORT_STOPPED);

	iport->logical_port_index  = SCIC_SDS_DUMMY_PORT;
	iport->physical_port_index = index;
	iport->active_phy_mask     = 0;
	iport->ready_exit	      = false;

	iport->owning_controller = ihost;

	iport->started_request_count = 0;
	iport->assigned_device_count = 0;

	iport->reserved_rni = SCU_DUMMY_INDEX;
	iport->reserved_tag = SCI_CONTROLLER_INVALID_IO_TAG;

	sci_init_timer(&iport->timer, port_timeout);

	iport->port_task_scheduler_registers = NULL;

	for (index = 0; index < SCI_MAX_PHYS; index++)
		iport->phy_table[index] = NULL;
}

void isci_port_init(struct isci_port *iport, struct isci_host *ihost, int index)
{
	INIT_LIST_HEAD(&iport->remote_dev_list);
	INIT_LIST_HEAD(&iport->domain_dev_list);
	spin_lock_init(&iport->state_lock);
	init_completion(&iport->start_complete);
	iport->isci_host = ihost;
	isci_port_change_state(iport, isci_freed);
	atomic_set(&iport->event, 0);
}

/**
 * isci_port_get_state() - This function gets the status of the port object.
 * @isci_port: This parameter points to the isci_port object
 *
 * status of the object as a isci_status enum.
 */
enum isci_status isci_port_get_state(
	struct isci_port *isci_port)
{
	return isci_port->status;
}

void sci_port_broadcast_change_received(struct isci_port *iport, struct isci_phy *iphy)
{
	struct isci_host *ihost = iport->owning_controller;

	/* notify the user. */
	isci_port_bc_change_received(ihost, iport, iphy);
}

int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
				 struct isci_phy *iphy)
{
	unsigned long flags;
	enum sci_status status;
	int idx, ret = TMF_RESP_FUNC_COMPLETE;

	dev_dbg(&ihost->pdev->dev, "%s: iport = %p\n",
		__func__, iport);

	init_completion(&iport->hard_reset_complete);

	spin_lock_irqsave(&ihost->scic_lock, flags);

	#define ISCI_PORT_RESET_TIMEOUT SCIC_SDS_SIGNATURE_FIS_TIMEOUT
	status = sci_port_hard_reset(iport, ISCI_PORT_RESET_TIMEOUT);

	spin_unlock_irqrestore(&ihost->scic_lock, flags);

	if (status == SCI_SUCCESS) {
		wait_for_completion(&iport->hard_reset_complete);

		dev_dbg(&ihost->pdev->dev,
			"%s: iport = %p; hard reset completion\n",
			__func__, iport);

		if (iport->hard_reset_status != SCI_SUCCESS)
			ret = TMF_RESP_FUNC_FAILED;
	} else {
		ret = TMF_RESP_FUNC_FAILED;

		dev_err(&ihost->pdev->dev,
			"%s: iport = %p; sci_port_hard_reset call"
			" failed 0x%x\n",
			__func__, iport, status);

	}

	/* If the hard reset for the port has failed, consider this
	 * the same as link failures on all phys in the port.
	 */
	if (ret != TMF_RESP_FUNC_COMPLETE) {

		dev_err(&ihost->pdev->dev,
			"%s: iport = %p; hard reset failed "
			"(0x%x) - driving explicit link fail for all phys\n",
			__func__, iport, iport->hard_reset_status);

		/* Down all phys in the port. */
		spin_lock_irqsave(&ihost->scic_lock, flags);
		for (idx = 0; idx < SCI_MAX_PHYS; ++idx) {
			struct isci_phy *iphy = iport->phy_table[idx];

			if (!iphy)
				continue;
			sci_phy_stop(iphy);
			sci_phy_start(iphy);
		}
		spin_unlock_irqrestore(&ihost->scic_lock, flags);
	}
	return ret;
}

/**
 * isci_port_deformed() - This function is called by libsas when a port becomes
 *    inactive.
 * @phy: This parameter specifies the libsas phy with the inactive port.
 *
 */
void isci_port_deformed(struct asd_sas_phy *phy)
{
	pr_debug("%s: sas_phy = %p\n", __func__, phy);
}

/**
 * isci_port_formed() - This function is called by libsas when a port becomes
 *    active.
 * @phy: This parameter specifies the libsas phy with the active port.
 *
 */
void isci_port_formed(struct asd_sas_phy *phy)
{
	pr_debug("%s: sas_phy = %p, sas_port = %p\n", __func__, phy, phy->port);
}