aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/host/xhci.h
blob: 2c510e4a7d4c61b92df567c83d01ffba96aa849c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
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
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
/*
 * xHCI host controller driver
 *
 * Copyright (C) 2008 Intel Corp.
 *
 * Author: Sarah Sharp
 * Some code borrowed from the Linux EHCI driver.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef __LINUX_XHCI_HCD_H
#define __LINUX_XHCI_HCD_H

#include <linux/usb.h>
#include <linux/timer.h>
#include <linux/kernel.h>
#include <linux/usb/hcd.h>

/* Code sharing between pci-quirks and xhci hcd */
#include	"xhci-ext-caps.h"
#include "pci-quirks.h"

/* xHCI PCI Configuration Registers */
#define XHCI_SBRN_OFFSET	(0x60)

/* Max number of USB devices for any host controller - limit in section 6.1 */
#define MAX_HC_SLOTS		256
/* Section 5.3.3 - MaxPorts */
#define MAX_HC_PORTS		127

/*
 * xHCI register interface.
 * This corresponds to the eXtensible Host Controller Interface (xHCI)
 * Revision 0.95 specification
 */

/**
 * struct xhci_cap_regs - xHCI Host Controller Capability Registers.
 * @hc_capbase:		length of the capabilities register and HC version number
 * @hcs_params1:	HCSPARAMS1 - Structural Parameters 1
 * @hcs_params2:	HCSPARAMS2 - Structural Parameters 2
 * @hcs_params3:	HCSPARAMS3 - Structural Parameters 3
 * @hcc_params:		HCCPARAMS - Capability Parameters
 * @db_off:		DBOFF - Doorbell array offset
 * @run_regs_off:	RTSOFF - Runtime register space offset
 */
struct xhci_cap_regs {
	__le32	hc_capbase;
	__le32	hcs_params1;
	__le32	hcs_params2;
	__le32	hcs_params3;
	__le32	hcc_params;
	__le32	db_off;
	__le32	run_regs_off;
	/* Reserved up to (CAPLENGTH - 0x1C) */
};

/* hc_capbase bitmasks */
/* bits 7:0 - how long is the Capabilities register */
#define HC_LENGTH(p)		XHCI_HC_LENGTH(p)
/* bits 31:16	*/
#define HC_VERSION(p)		(((p) >> 16) & 0xffff)

/* HCSPARAMS1 - hcs_params1 - bitmasks */
/* bits 0:7, Max Device Slots */
#define HCS_MAX_SLOTS(p)	(((p) >> 0) & 0xff)
#define HCS_SLOTS_MASK		0xff
/* bits 8:18, Max Interrupters */
#define HCS_MAX_INTRS(p)	(((p) >> 8) & 0x7ff)
/* bits 24:31, Max Ports - max value is 0x7F = 127 ports */
#define HCS_MAX_PORTS(p)	(((p) >> 24) & 0x7f)

/* HCSPARAMS2 - hcs_params2 - bitmasks */
/* bits 0:3, frames or uframes that SW needs to queue transactions
 * ahead of the HW to meet periodic deadlines */
#define HCS_IST(p)		(((p) >> 0) & 0xf)
/* bits 4:7, max number of Event Ring segments */
#define HCS_ERST_MAX(p)		(((p) >> 4) & 0xf)
/* bit 26 Scratchpad restore - for save/restore HW state - not used yet */
/* bits 27:31 number of Scratchpad buffers SW must allocate for the HW */
#define HCS_MAX_SCRATCHPAD(p)   (((p) >> 27) & 0x1f)

/* HCSPARAMS3 - hcs_params3 - bitmasks */
/* bits 0:7, Max U1 to U0 latency for the roothub ports */
#define HCS_U1_LATENCY(p)	(((p) >> 0) & 0xff)
/* bits 16:31, Max U2 to U0 latency for the roothub ports */
#define HCS_U2_LATENCY(p)	(((p) >> 16) & 0xffff)

/* HCCPARAMS - hcc_params - bitmasks */
/* true: HC can use 64-bit address pointers */
#define HCC_64BIT_ADDR(p)	((p) & (1 << 0))
/* true: HC can do bandwidth negotiation */
#define HCC_BANDWIDTH_NEG(p)	((p) & (1 << 1))
/* true: HC uses 64-byte Device Context structures
 * FIXME 64-byte context structures aren't supported yet.
 */
#define HCC_64BYTE_CONTEXT(p)	((p) & (1 << 2))
/* true: HC has port power switches */
#define HCC_PPC(p)		((p) & (1 << 3))
/* true: HC has port indicators */
#define HCS_INDICATOR(p)	((p) & (1 << 4))
/* true: HC has Light HC Reset Capability */
#define HCC_LIGHT_RESET(p)	((p) & (1 << 5))
/* true: HC supports latency tolerance messaging */
#define HCC_LTC(p)		((p) & (1 << 6))
/* true: no secondary Stream ID Support */
#define HCC_NSS(p)		((p) & (1 << 7))
/* Max size for Primary Stream Arrays - 2^(n+1), where n is bits 12:15 */
#define HCC_MAX_PSA(p)		(1 << ((((p) >> 12) & 0xf) + 1))
/* Extended Capabilities pointer from PCI base - section 5.3.6 */
#define HCC_EXT_CAPS(p)		XHCI_HCC_EXT_CAPS(p)

/* db_off bitmask - bits 0:1 reserved */
#define	DBOFF_MASK	(~0x3)

/* run_regs_off bitmask - bits 0:4 reserved */
#define	RTSOFF_MASK	(~0x1f)


/* Number of registers per port */
#define	NUM_PORT_REGS	4

/**
 * struct xhci_op_regs - xHCI Host Controller Operational Registers.
 * @command:		USBCMD - xHC command register
 * @status:		USBSTS - xHC status register
 * @page_size:		This indicates the page size that the host controller
 * 			supports.  If bit n is set, the HC supports a page size
 * 			of 2^(n+12), up to a 128MB page size.
 * 			4K is the minimum page size.
 * @cmd_ring:		CRP - 64-bit Command Ring Pointer
 * @dcbaa_ptr:		DCBAAP - 64-bit Device Context Base Address Array Pointer
 * @config_reg:		CONFIG - Configure Register
 * @port_status_base:	PORTSCn - base address for Port Status and Control
 * 			Each port has a Port Status and Control register,
 * 			followed by a Port Power Management Status and Control
 * 			register, a Port Link Info register, and a reserved
 * 			register.
 * @port_power_base:	PORTPMSCn - base address for
 * 			Port Power Management Status and Control
 * @port_link_base:	PORTLIn - base address for Port Link Info (current
 * 			Link PM state and control) for USB 2.1 and USB 3.0
 * 			devices.
 */
struct xhci_op_regs {
	__le32	command;
	__le32	status;
	__le32	page_size;
	__le32	reserved1;
	__le32	reserved2;
	__le32	dev_notification;
	__le64	cmd_ring;
	/* rsvd: offset 0x20-2F */
	__le32	reserved3[4];
	__le64	dcbaa_ptr;
	__le32	config_reg;
	/* rsvd: offset 0x3C-3FF */
	__le32	reserved4[241];
	/* port 1 registers, which serve as a base address for other ports */
	__le32	port_status_base;
	__le32	port_power_base;
	__le32	port_link_base;
	__le32	reserved5;
	/* registers for ports 2-255 */
	__le32	reserved6[NUM_PORT_REGS*254];
};

/* USBCMD - USB command - command bitmasks */
/* start/stop HC execution - do not write unless HC is halted*/
#define CMD_RUN		XHCI_CMD_RUN
/* Reset HC - resets internal HC state machine and all registers (except
 * PCI config regs).  HC does NOT drive a USB reset on the downstream ports.
 * The xHCI driver must reinitialize the xHC after setting this bit.
 */
#define CMD_RESET	(1 << 1)
/* Event Interrupt Enable - a '1' allows interrupts from the host controller */
#define CMD_EIE		XHCI_CMD_EIE
/* Host System Error Interrupt Enable - get out-of-band signal for HC errors */
#define CMD_HSEIE	XHCI_CMD_HSEIE
/* bits 4:6 are reserved (and should be preserved on writes). */
/* light reset (port status stays unchanged) - reset completed when this is 0 */
#define CMD_LRESET	(1 << 7)
/* host controller save/restore state. */
#define CMD_CSS		(1 << 8)
#define CMD_CRS		(1 << 9)
/* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
#define CMD_EWE		XHCI_CMD_EWE
/* MFINDEX power management - '1' means xHC can stop MFINDEX counter if all root
 * hubs are in U3 (selective suspend), disconnect, disabled, or powered-off.
 * '0' means the xHC can power it off if all ports are in the disconnect,
 * disabled, or powered-off state.
 */
#define CMD_PM_INDEX	(1 << 11)
/* bits 12:31 are reserved (and should be preserved on writes). */

/* IMAN - Interrupt Management Register */
#define IMAN_IE		(1 << 1)
#define IMAN_IP		(1 << 0)

/* USBSTS - USB status - status bitmasks */
/* HC not running - set to 1 when run/stop bit is cleared. */
#define STS_HALT	XHCI_STS_HALT
/* serious error, e.g. PCI parity error.  The HC will clear the run/stop bit. */
#define STS_FATAL	(1 << 2)
/* event interrupt - clear this prior to clearing any IP flags in IR set*/
#define STS_EINT	(1 << 3)
/* port change detect */
#define STS_PORT	(1 << 4)
/* bits 5:7 reserved and zeroed */
/* save state status - '1' means xHC is saving state */
#define STS_SAVE	(1 << 8)
/* restore state status - '1' means xHC is restoring state */
#define STS_RESTORE	(1 << 9)
/* true: save or restore error */
#define STS_SRE		(1 << 10)
/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
#define STS_CNR		XHCI_STS_CNR
/* true: internal Host Controller Error - SW needs to reset and reinitialize */
#define STS_HCE		(1 << 12)
/* bits 13:31 reserved and should be preserved */

/*
 * DNCTRL - Device Notification Control Register - dev_notification bitmasks
 * Generate a device notification event when the HC sees a transaction with a
 * notification type that matches a bit set in this bit field.
 */
#define	DEV_NOTE_MASK		(0xffff)
#define ENABLE_DEV_NOTE(x)	(1 << (x))
/* Most of the device notification types should only be used for debug.
 * SW does need to pay attention to function wake notifications.
 */
#define	DEV_NOTE_FWAKE		ENABLE_DEV_NOTE(1)

/* CRCR - Command Ring Control Register - cmd_ring bitmasks */
/* bit 0 is the command ring cycle state */
/* stop ring operation after completion of the currently executing command */
#define CMD_RING_PAUSE		(1 << 1)
/* stop ring immediately - abort the currently executing command */
#define CMD_RING_ABORT		(1 << 2)
/* true: command ring is running */
#define CMD_RING_RUNNING	(1 << 3)
/* bits 4:5 reserved and should be preserved */
/* Command Ring pointer - bit mask for the lower 32 bits. */
#define CMD_RING_RSVD_BITS	(0x3f)

/* CONFIG - Configure Register - config_reg bitmasks */
/* bits 0:7 - maximum number of device slots enabled (NumSlotsEn) */
#define MAX_DEVS(p)	((p) & 0xff)
/* bits 8:31 - reserved and should be preserved */

/* PORTSC - Port Status and Control Register - port_status_base bitmasks */
/* true: device connected */
#define PORT_CONNECT	(1 << 0)
/* true: port enabled */
#define PORT_PE		(1 << 1)
/* bit 2 reserved and zeroed */
/* true: port has an over-current condition */
#define PORT_OC		(1 << 3)
/* true: port reset signaling asserted */
#define PORT_RESET	(1 << 4)
/* Port Link State - bits 5:8
 * A read gives the current link PM state of the port,
 * a write with Link State Write Strobe set sets the link state.
 */
#define PORT_PLS_MASK	(0xf << 5)
#define XDEV_U0		(0x0 << 5)
#define XDEV_U2		(0x2 << 5)
#define XDEV_U3		(0x3 << 5)
#define XDEV_RESUME	(0xf << 5)
/* true: port has power (see HCC_PPC) */
#define PORT_POWER	(1 << 9)
/* bits 10:13 indicate device speed:
 * 0 - undefined speed - port hasn't be initialized by a reset yet
 * 1 - full speed
 * 2 - low speed
 * 3 - high speed
 * 4 - super speed
 * 5-15 reserved
 */
#define DEV_SPEED_MASK		(0xf << 10)
#define	XDEV_FS			(0x1 << 10)
#define	XDEV_LS			(0x2 << 10)
#define	XDEV_HS			(0x3 << 10)
#define	XDEV_SS			(0x4 << 10)
#define DEV_UNDEFSPEED(p)	(((p) & DEV_SPEED_MASK) == (0x0<<10))
#define DEV_FULLSPEED(p)	(((p) & DEV_SPEED_MASK) == XDEV_FS)
#define DEV_LOWSPEED(p)		(((p) & DEV_SPEED_MASK) == XDEV_LS)
#define DEV_HIGHSPEED(p)	(((p) & DEV_SPEED_MASK) == XDEV_HS)
#define DEV_SUPERSPEED(p)	(((p) & DEV_SPEED_MASK) == XDEV_SS)
/* Bits 20:23 in the Slot Context are the speed for the device */
#define	SLOT_SPEED_FS		(XDEV_FS << 10)
#define	SLOT_SPEED_LS		(XDEV_LS << 10)
#define	SLOT_SPEED_HS		(XDEV_HS << 10)
#define	SLOT_SPEED_SS		(XDEV_SS << 10)
/* Port Indicator Control */
#define PORT_LED_OFF	(0 << 14)
#define PORT_LED_AMBER	(1 << 14)
#define PORT_LED_GREEN	(2 << 14)
#define PORT_LED_MASK	(3 << 14)
/* Port Link State Write Strobe - set this when changing link state */
#define PORT_LINK_STROBE	(1 << 16)
/* true: connect status change */
#define PORT_CSC	(1 << 17)
/* true: port enable change */
#define PORT_PEC	(1 << 18)
/* true: warm reset for a USB 3.0 device is done.  A "hot" reset puts the port
 * into an enabled state, and the device into the default state.  A "warm" reset
 * also resets the link, forcing the device through the link training sequence.
 * SW can also look at the Port Reset register to see when warm reset is done.
 */
#define PORT_WRC	(1 << 19)
/* true: over-current change */
#define PORT_OCC	(1 << 20)
/* true: reset change - 1 to 0 transition of PORT_RESET */
#define PORT_RC		(1 << 21)
/* port link status change - set on some port link state transitions:
 *  Transition				Reason
 *  ------------------------------------------------------------------------------
 *  - U3 to Resume			Wakeup signaling from a device
 *  - Resume to Recovery to U0		USB 3.0 device resume
 *  - Resume to U0			USB 2.0 device resume
 *  - U3 to Recovery to U0		Software resume of USB 3.0 device complete
 *  - U3 to U0				Software resume of USB 2.0 device complete
 *  - U2 to U0				L1 resume of USB 2.1 device complete
 *  - U0 to U0 (???)			L1 entry rejection by USB 2.1 device
 *  - U0 to disabled			L1 entry error with USB 2.1 device
 *  - Any state to inactive		Error on USB 3.0 port
 */
#define PORT_PLC	(1 << 22)
/* port configure error change - port failed to configure its link partner */
#define PORT_CEC	(1 << 23)
/* Cold Attach Status - xHC can set this bit to report device attached during
 * Sx state. Warm port reset should be perfomed to clear this bit and move port
 * to connected state.
 */
#define PORT_CAS	(1 << 24)
/* wake on connect (enable) */
#define PORT_WKCONN_E	(1 << 25)
/* wake on disconnect (enable) */
#define PORT_WKDISC_E	(1 << 26)
/* wake on over-current (enable) */
#define PORT_WKOC_E	(1 << 27)
/* bits 28:29 reserved */
/* true: device is removable - for USB 3.0 roothub emulation */
#define PORT_DEV_REMOVE	(1 << 30)
/* Initiate a warm port reset - complete when PORT_WRC is '1' */
#define PORT_WR		(1 << 31)

/* We mark duplicate entries with -1 */
#define DUPLICATE_ENTRY ((u8)(-1))

/* Port Power Management Status and Control - port_power_base bitmasks */
/* Inactivity timer value for transitions into U1, in microseconds.
 * Timeout can be up to 127us.  0xFF means an infinite timeout.
 */
#define PORT_U1_TIMEOUT(p)	((p) & 0xff)
#define PORT_U1_TIMEOUT_MASK	0xff
/* Inactivity timer value for transitions into U2 */
#define PORT_U2_TIMEOUT(p)	(((p) & 0xff) << 8)
#define PORT_U2_TIMEOUT_MASK	(0xff << 8)
/* Bits 24:31 for port testing */

/* USB2 Protocol PORTSPMSC */
#define	PORT_L1S_MASK		7
#define	PORT_L1S_SUCCESS	1
#define	PORT_RWE		(1 << 3)
#define	PORT_HIRD(p)		(((p) & 0xf) << 4)
#define	PORT_HIRD_MASK		(0xf << 4)
#define	PORT_L1DS(p)		(((p) & 0xff) << 8)
#define	PORT_HLE		(1 << 16)

/**
 * struct xhci_intr_reg - Interrupt Register Set
 * @irq_pending:	IMAN - Interrupt Management Register.  Used to enable
 *			interrupts and check for pending interrupts.
 * @irq_control:	IMOD - Interrupt Moderation Register.
 * 			Used to throttle interrupts.
 * @erst_size:		Number of segments in the Event Ring Segment Table (ERST).
 * @erst_base:		ERST base address.
 * @erst_dequeue:	Event ring dequeue pointer.
 *
 * Each interrupter (defined by a MSI-X vector) has an event ring and an Event
 * Ring Segment Table (ERST) associated with it.  The event ring is comprised of
 * multiple segments of the same size.  The HC places events on the ring and
 * "updates the Cycle bit in the TRBs to indicate to software the current
 * position of the Enqueue Pointer." The HCD (Linux) processes those events and
 * updates the dequeue pointer.
 */
struct xhci_intr_reg {
	__le32	irq_pending;
	__le32	irq_control;
	__le32	erst_size;
	__le32	rsvd;
	__le64	erst_base;
	__le64	erst_dequeue;
};

/* irq_pending bitmasks */
#define	ER_IRQ_PENDING(p)	((p) & 0x1)
/* bits 2:31 need to be preserved */
/* THIS IS BUGGY - FIXME - IP IS WRITE 1 TO CLEAR */
#define	ER_IRQ_CLEAR(p)		((p) & 0xfffffffe)
#define	ER_IRQ_ENABLE(p)	((ER_IRQ_CLEAR(p)) | 0x2)
#define	ER_IRQ_DISABLE(p)	((ER_IRQ_CLEAR(p)) & ~(0x2))

/* irq_control bitmasks */
/* Minimum interval between interrupts (in 250ns intervals).  The interval
 * between interrupts will be longer if there are no events on the event ring.
 * Default is 4000 (1 ms).
 */
#define ER_IRQ_INTERVAL_MASK	(0xffff)
/* Counter used to count down the time to the next interrupt - HW use only */
#define ER_IRQ_COUNTER_MASK	(0xffff << 16)

/* erst_size bitmasks */
/* Preserve bits 16:31 of erst_size */
#define	ERST_SIZE_MASK		(0xffff << 16)

/* erst_dequeue bitmasks */
/* Dequeue ERST Segment Index (DESI) - Segment number (or alias)
 * where the current dequeue pointer lies.  This is an optional HW hint.
 */
#define ERST_DESI_MASK		(0x7)
/* Event Handler Busy (EHB) - is the event ring scheduled to be serviced by
 * a work queue (or delayed service routine)?
 */
#define ERST_EHB		(1 << 3)
#define ERST_PTR_MASK		(0xf)

/**
 * struct xhci_run_regs
 * @microframe_index:
 * 		MFINDEX - current microframe number
 *
 * Section 5.5 Host Controller Runtime Registers:
 * "Software should read and write these registers using only Dword (32 bit)
 * or larger accesses"
 */
struct xhci_run_regs {
	__le32			microframe_index;
	__le32			rsvd[7];
	struct xhci_intr_reg	ir_set[128];
};

/**
 * struct doorbell_array
 *
 * Bits  0 -  7: Endpoint target
 * Bits  8 - 15: RsvdZ
 * Bits 16 - 31: Stream ID
 *
 * Section 5.6
 */
struct xhci_doorbell_array {
	__le32	doorbell[256];
};

#define DB_VALUE(ep, stream)	((((ep) + 1) & 0xff) | ((stream) << 16))
#define DB_VALUE_HOST		0x00000000

/**
 * struct xhci_protocol_caps
 * @revision:		major revision, minor revision, capability ID,
 *			and next capability pointer.
 * @name_string:	Four ASCII characters to say which spec this xHC
 *			follows, typically "USB ".
 * @port_info:		Port offset, count, and protocol-defined information.
 */
struct xhci_protocol_caps {
	u32	revision;
	u32	name_string;
	u32	port_info;
};

#define	XHCI_EXT_PORT_MAJOR(x)	(((x) >> 24) & 0xff)
#define	XHCI_EXT_PORT_OFF(x)	((x) & 0xff)
#define	XHCI_EXT_PORT_COUNT(x)	(((x) >> 8) & 0xff)

/**
 * struct xhci_container_ctx
 * @type: Type of context.  Used to calculated offsets to contained contexts.
 * @size: Size of the context data
 * @bytes: The raw context data given to HW
 * @dma: dma address of the bytes
 *
 * Represents either a Device or Input context.  Holds a pointer to the raw
 * memory used for the context (bytes) and dma address of it (dma).
 */
struct xhci_container_ctx {
	unsigned type;
#define XHCI_CTX_TYPE_DEVICE  0x1
#define XHCI_CTX_TYPE_INPUT   0x2

	int size;

	u8 *bytes;
	dma_addr_t dma;
};

/**
 * struct xhci_slot_ctx
 * @dev_info:	Route string, device speed, hub info, and last valid endpoint
 * @dev_info2:	Max exit latency for device number, root hub port number
 * @tt_info:	tt_info is used to construct split transaction tokens
 * @dev_state:	slot state and device address
 *
 * Slot Context - section 6.2.1.1.  This assumes the HC uses 32-byte context
 * structures.  If the HC uses 64-byte contexts, there is an additional 32 bytes
 * reserved at the end of the slot context for HC internal use.
 */
struct xhci_slot_ctx {
	__le32	dev_info;
	__le32	dev_info2;
	__le32	tt_info;
	__le32	dev_state;
	/* offset 0x10 to 0x1f reserved for HC internal use */
	__le32	reserved[4];
};

/* dev_info bitmasks */
/* Route String - 0:19 */
#define ROUTE_STRING_MASK	(0xfffff)
/* Device speed - values defined by PORTSC Device Speed field - 20:23 */
#define DEV_SPEED	(0xf << 20)
/* bit 24 reserved */
/* Is this LS/FS device connected through a HS hub? - bit 25 */
#define DEV_MTT		(0x1 << 25)
/* Set if the device is a hub - bit 26 */
#define DEV_HUB		(0x1 << 26)
/* Index of the last valid endpoint context in this device context - 27:31 */
#define LAST_CTX_MASK	(0x1f << 27)
#define LAST_CTX(p)	((p) << 27)
#define LAST_CTX_TO_EP_NUM(p)	(((p) >> 27) - 1)
#define SLOT_FLAG	(1 << 0)
#define EP0_FLAG	(1 << 1)

/* dev_info2 bitmasks */
/* Max Exit Latency (ms) - worst case time to wake up all links in dev path */
#define MAX_EXIT	(0xffff)
/* Root hub port number that is needed to access the USB device */
#define ROOT_HUB_PORT(p)	(((p) & 0xff) << 16)
#define DEVINFO_TO_ROOT_HUB_PORT(p)	(((p) >> 16) & 0xff)
/* Maximum number of ports under a hub device */
#define XHCI_MAX_PORTS(p)	(((p) & 0xff) << 24)

/* tt_info bitmasks */
/*
 * TT Hub Slot ID - for low or full speed devices attached to a high-speed hub
 * The Slot ID of the hub that isolates the high speed signaling from
 * this low or full-speed device.  '0' if attached to root hub port.
 */
#define TT_SLOT		(0xff)
/*
 * The number of the downstream facing port of the high-speed hub
 * '0' if the device is not low or full speed.
 */
#define TT_PORT		(0xff << 8)
#define TT_THINK_TIME(p)	(((p) & 0x3) << 16)

/* dev_state bitmasks */
/* USB device address - assigned by the HC */
#define DEV_ADDR_MASK	(0xff)
/* bits 8:26 reserved */
/* Slot state */
#define SLOT_STATE	(0x1f << 27)
#define GET_SLOT_STATE(p)	(((p) & (0x1f << 27)) >> 27)

#define SLOT_STATE_DISABLED	0
#define SLOT_STATE_ENABLED	SLOT_STATE_DISABLED
#define SLOT_STATE_DEFAULT	1
#define SLOT_STATE_ADDRESSED	2
#define SLOT_STATE_CONFIGURED	3

/**
 * struct xhci_ep_ctx
 * @ep_info:	endpoint state, streams, mult, and interval information.
 * @ep_info2:	information on endpoint type, max packet size, max burst size,
 * 		error count, and whether the HC will force an event for all
 * 		transactions.
 * @deq:	64-bit ring dequeue pointer address.  If the endpoint only
 * 		defines one stream, this points to the endpoint transfer ring.
 * 		Otherwise, it points to a stream context array, which has a
 * 		ring pointer for each flow.
 * @tx_info:
 * 		Average TRB lengths for the endpoint ring and
 * 		max payload within an Endpoint Service Interval Time (ESIT).
 *
 * Endpoint Context - section 6.2.1.2.  This assumes the HC uses 32-byte context
 * structures.  If the HC uses 64-byte contexts, there is an additional 32 bytes
 * reserved at the end of the endpoint context for HC internal use.
 */
struct xhci_ep_ctx {
	__le32	ep_info;
	__le32	ep_info2;
	__le64	deq;
	__le32	tx_info;
	/* offset 0x14 - 0x1f reserved for HC internal use */
	__le32	reserved[3];
};

/* ep_info bitmasks */
/*
 * Endpoint State - bits 0:2
 * 0 - disabled
 * 1 - running
 * 2 - halted due to halt condition - ok to manipulate endpoint ring
 * 3 - stopped
 * 4 - TRB error
 * 5-7 - reserved
 */
#define EP_STATE_MASK		(0xf)
#define EP_STATE_DISABLED	0
#define EP_STATE_RUNNING	1
#define EP_STATE_HALTED		2
#define EP_STATE_STOPPED	3
#define EP_STATE_ERROR		4
/* Mult - Max number of burtst within an interval, in EP companion desc. */
#define EP_MULT(p)		(((p) & 0x3) << 8)
#define CTX_TO_EP_MULT(p)	(((p) >> 8) & 0x3)
/* bits 10:14 are Max Primary Streams */
/* bit 15 is Linear Stream Array */
/* Interval - period between requests to an endpoint - 125u increments. */
#define EP_INTERVAL(p)		(((p) & 0xff) << 16)
#define EP_INTERVAL_TO_UFRAMES(p)		(1 << (((p) >> 16) & 0xff))
#define CTX_TO_EP_INTERVAL(p)	(((p) >> 16) & 0xff)
#define EP_MAXPSTREAMS_MASK	(0x1f << 10)
#define EP_MAXPSTREAMS(p)	(((p) << 10) & EP_MAXPSTREAMS_MASK)
/* Endpoint is set up with a Linear Stream Array (vs. Secondary Stream Array) */
#define	EP_HAS_LSA		(1 << 15)

/* ep_info2 bitmasks */
/*
 * Force Event - generate transfer events for all TRBs for this endpoint
 * This will tell the HC to ignore the IOC and ISP flags (for debugging only).
 */
#define	FORCE_EVENT	(0x1)
#define ERROR_COUNT(p)	(((p) & 0x3) << 1)
#define CTX_TO_EP_TYPE(p)	(((p) >> 3) & 0x7)
#define EP_TYPE(p)	((p) << 3)
#define ISOC_OUT_EP	1
#define BULK_OUT_EP	2
#define INT_OUT_EP	3
#define CTRL_EP		4
#define ISOC_IN_EP	5
#define BULK_IN_EP	6
#define INT_IN_EP	7
/* bit 6 reserved */
/* bit 7 is Host Initiate Disable - for disabling stream selection */
#define MAX_BURST(p)	(((p)&0xff) << 8)
#define CTX_TO_MAX_BURST(p)	(((p) >> 8) & 0xff)
#define MAX_PACKET(p)	(((p)&0xffff) << 16)
#define MAX_PACKET_MASK		(0xffff << 16)
#define MAX_PACKET_DECODED(p)	(((p) >> 16) & 0xffff)

/* Get max packet size from ep desc. Bit 10..0 specify the max packet size.
 * USB2.0 spec 9.6.6.
 */
#define GET_MAX_PACKET(p)	((p) & 0x7ff)

/* tx_info bitmasks */
#define AVG_TRB_LENGTH_FOR_EP(p)	((p) & 0xffff)
#define MAX_ESIT_PAYLOAD_FOR_EP(p)	(((p) & 0xffff) << 16)
#define CTX_TO_MAX_ESIT_PAYLOAD(p)	(((p) >> 16) & 0xffff)

/* deq bitmasks */
#define EP_CTX_CYCLE_MASK		(1 << 0)


/**
 * struct xhci_input_control_context
 * Input control context; see section 6.2.5.
 *
 * @drop_context:	set the bit of the endpoint context you want to disable
 * @add_context:	set the bit of the endpoint context you want to enable
 */
struct xhci_input_control_ctx {
	__le32	drop_flags;
	__le32	add_flags;
	__le32	rsvd2[6];
};

#define	EP_IS_ADDED(ctrl_ctx, i) \
	(le32_to_cpu(ctrl_ctx->add_flags) & (1 << (i + 1)))
#define	EP_IS_DROPPED(ctrl_ctx, i)       \
	(le32_to_cpu(ctrl_ctx->drop_flags) & (1 << (i + 1)))

/* Represents everything that is needed to issue a command on the command ring.
 * It's useful to pre-allocate these for commands that cannot fail due to
 * out-of-memory errors, like freeing streams.
 */
struct xhci_command {
	/* Input context for changing device state */
	struct xhci_container_ctx	*in_ctx;
	u32				status;
	/* If completion is null, no one is waiting on this command
	 * and the structure can be freed after the command completes.
	 */
	struct completion		*completion;
	union xhci_trb			*command_trb;
	struct list_head		cmd_list;
};

/* drop context bitmasks */
#define	DROP_EP(x)	(0x1 << x)
/* add context bitmasks */
#define	ADD_EP(x)	(0x1 << x)

struct xhci_stream_ctx {
	/* 64-bit stream ring address, cycle state, and stream type */
	__le64	stream_ring;
	/* offset 0x14 - 0x1f reserved for HC internal use */
	__le32	reserved[2];
};

/* Stream Context Types (section 6.4.1) - bits 3:1 of stream ctx deq ptr */
#define	SCT_FOR_CTX(p)		(((p) << 1) & 0x7)
/* Secondary stream array type, dequeue pointer is to a transfer ring */
#define	SCT_SEC_TR		0
/* Primary stream array type, dequeue pointer is to a transfer ring */
#define	SCT_PRI_TR		1
/* Dequeue pointer is for a secondary stream array (SSA) with 8 entries */
#define SCT_SSA_8		2
#define SCT_SSA_16		3
#define SCT_SSA_32		4
#define SCT_SSA_64		5
#define SCT_SSA_128		6
#define SCT_SSA_256		7

/* Assume no secondary streams for now */
struct xhci_stream_info {
	struct xhci_ring		**stream_rings;
	/* Number of streams, including stream 0 (which drivers can't use) */
	unsigned int			num_streams;
	/* The stream context array may be bigger than
	 * the number of streams the driver asked for
	 */
	struct xhci_stream_ctx		*stream_ctx_array;
	unsigned int			num_stream_ctxs;
	dma_addr_t			ctx_array_dma;
	/* For mapping physical TRB addresses to segments in stream rings */
	struct radix_tree_root		trb_address_map;
	struct xhci_command		*free_streams_command;
};

#define	SMALL_STREAM_ARRAY_SIZE		256
#define	MEDIUM_STREAM_ARRAY_SIZE	1024

/* Some Intel xHCI host controllers need software to keep track of the bus
 * bandwidth.  Keep track of endpoint info here.  Each root port is allocated
 * the full bus bandwidth.  We must also treat TTs (including each port under a
 * multi-TT hub) as a separate bandwidth domain.  The direct memory interface
 * (DMI) also limits the total bandwidth (across all domains) that can be used.
 */
struct xhci_bw_info {
	/* ep_interval is zero-based */
	unsigned int		ep_interval;
	/* mult and num_packets are one-based */
	unsigned int		mult;
	unsigned int		num_packets;
	unsigned int		max_packet_size;
	unsigned int		max_esit_payload;
	unsigned int		type;
};

/* "Block" sizes in bytes the hardware uses for different device speeds.
 * The logic in this part of the hardware limits the number of bits the hardware
 * can use, so must represent bandwidth in a less precise manner to mimic what
 * the scheduler hardware computes.
 */
#define	FS_BLOCK	1
#define	HS_BLOCK	4
#define	SS_BLOCK	16
#define	DMI_BLOCK	32

/* Each device speed has a protocol overhead (CRC, bit stuffing, etc) associated
 * with each byte transferred.  SuperSpeed devices have an initial overhead to
 * set up bursts.  These are in blocks, see above.  LS overhead has already been
 * translated into FS blocks.
 */
#define DMI_OVERHEAD 8
#define DMI_OVERHEAD_BURST 4
#define SS_OVERHEAD 8
#define SS_OVERHEAD_BURST 32
#define HS_OVERHEAD 26
#define FS_OVERHEAD 20
#define LS_OVERHEAD 128
/* The TTs need to claim roughly twice as much bandwidth (94 bytes per
 * microframe ~= 24Mbps) of the HS bus as the devices can actually use because
 * of overhead associated with split transfers crossing microframe boundaries.
 * 31 blocks is pure protocol overhead.
 */
#define TT_HS_OVERHEAD (31 + 94)
#define TT_DMI_OVERHEAD (25 + 12)

/* Bandwidth limits in blocks */
#define FS_BW_LIMIT		1285
#define TT_BW_LIMIT		1320
#define HS_BW_LIMIT		1607
#define SS_BW_LIMIT_IN		3906
#define DMI_BW_LIMIT_IN		3906
#define SS_BW_LIMIT_OUT		3906
#define DMI_BW_LIMIT_OUT	3906

/* Percentage of bus bandwidth reserved for non-periodic transfers */
#define FS_BW_RESERVED		10
#define HS_BW_RESERVED		20
#define SS_BW_RESERVED		10

struct xhci_virt_ep {
	struct xhci_ring		*ring;
	/* Related to endpoints that are configured to use stream IDs only */
	struct xhci_stream_info		*stream_info;
	/* Temporary storage in case the configure endpoint command fails and we
	 * have to restore the device state to the previous state
	 */
	struct xhci_ring		*new_ring;
	unsigned int			ep_state;
#define SET_DEQ_PENDING		(1 << 0)
#define EP_HALTED		(1 << 1)	/* For stall handling */
#define EP_HALT_PENDING		(1 << 2)	/* For URB cancellation */
/* Transitioning the endpoint to using streams, don't enqueue URBs */
#define EP_GETTING_STREAMS	(1 << 3)
#define EP_HAS_STREAMS		(1 << 4)
/* Transitioning the endpoint to not using streams, don't enqueue URBs */
#define EP_GETTING_NO_STREAMS	(1 << 5)
	/* ----  Related to URB cancellation ---- */
	struct list_head	cancelled_td_list;
	/* The TRB that was last reported in a stopped endpoint ring */
	union xhci_trb		*stopped_trb;
	struct xhci_td		*stopped_td;
	unsigned int		stopped_stream;
	/* Watchdog timer for stop endpoint command to cancel URBs */
	struct timer_list	stop_cmd_timer;
	int			stop_cmds_pending;
	struct xhci_hcd		*xhci;
	/* Dequeue pointer and dequeue segment for a submitted Set TR Dequeue
	 * command.  We'll need to update the ring's dequeue segment and dequeue
	 * pointer after the command completes.
	 */
	struct xhci_segment	*queued_deq_seg;
	union xhci_trb		*queued_deq_ptr;
	/*
	 * Sometimes the xHC can not process isochronous endpoint ring quickly
	 * enough, and it will miss some isoc tds on the ring and generate
	 * a Missed Service Error Event.
	 * Set skip flag when receive a Missed Service Error Event and
	 * process the missed tds on the endpoint ring.
	 */
	bool			skip;
	/* Bandwidth checking storage */
	struct xhci_bw_info	bw_info;
	struct list_head	bw_endpoint_list;
};

enum xhci_overhead_type {
	LS_OVERHEAD_TYPE = 0,
	FS_OVERHEAD_TYPE,
	HS_OVERHEAD_TYPE,
};

struct xhci_interval_bw {
	unsigned int		num_packets;
	/* Sorted by max packet size.
	 * Head of the list is the greatest max packet size.
	 */
	struct list_head	endpoints;
	/* How many endpoints of each speed are present. */
	unsigned int		overhead[3];
};

#define	XHCI_MAX_INTERVAL	16

struct xhci_interval_bw_table {
	unsigned int		interval0_esit_payload;
	struct xhci_interval_bw	interval_bw[XHCI_MAX_INTERVAL];
	/* Includes reserved bandwidth for async endpoints */
	unsigned int		bw_used;
	unsigned int		ss_bw_in;
	unsigned int		ss_bw_out;
};


struct xhci_virt_device {
	struct usb_device		*udev;
	/*
	 * Commands to the hardware are passed an "input context" that
	 * tells the hardware what to change in its data structures.
	 * The hardware will return changes in an "output context" that
	 * software must allocate for the hardware.  We need to keep
	 * track of input and output contexts separately because
	 * these commands might fail and we don't trust the hardware.
	 */
	struct xhci_container_ctx       *out_ctx;
	/* Used for addressing devices and configuration changes */
	struct xhci_container_ctx       *in_ctx;
	/* Rings saved to ensure old alt settings can be re-instated */
	struct xhci_ring		**ring_cache;
	int				num_rings_cached;
	/* Store xHC assigned device address */
	int				address;
#define	XHCI_MAX_RINGS_CACHED	31
	struct xhci_virt_ep		eps[31];
	struct completion		cmd_completion;
	/* Status of the last command issued for this device */
	u32				cmd_status;
	struct list_head		cmd_list;
	u8				fake_port;
	u8				real_port;
	struct xhci_interval_bw_table	*bw_table;
	struct xhci_tt_bw_info		*tt_info;
	/* The current max exit latency for the enabled USB3 link states. */
	u16				current_mel;
};

/*
 * For each roothub, keep track of the bandwidth information for each periodic
 * interval.
 *
 * If a high speed hub is attached to the roothub, each TT associated with that
 * hub is a separate bandwidth domain.  The interval information for the
 * endpoints on the devices under that TT will appear in the TT structure.
 */
struct xhci_root_port_bw_info {
	struct list_head		tts;
	unsigned int			num_active_tts;
	struct xhci_interval_bw_table	bw_table;
};

struct xhci_tt_bw_info {
	struct list_head		tt_list;
	int				slot_id;
	int				ttport;
	struct xhci_interval_bw_table	bw_table;
	int				active_eps;
};


/**
 * struct xhci_device_context_array
 * @dev_context_ptr	array of 64-bit DMA addresses for device contexts
 */
struct xhci_device_context_array {
	/* 64-bit device addresses; we only write 32-bit addresses */
	__le64			dev_context_ptrs[MAX_HC_SLOTS];
	/* private xHCD pointers */
	dma_addr_t	dma;
};
/* TODO: write function to set the 64-bit device DMA address */
/*
 * TODO: change this to be dynamically sized at HC mem init time since the HC
 * might not be able to handle the maximum number of devices possible.
 */


struct xhci_transfer_event {
	/* 64-bit buffer address, or immediate data */
	__le64	buffer;
	__le32	transfer_len;
	/* This field is interpreted differently based on the type of TRB */
	__le32	flags;
};

/** Transfer Event bit fields **/
#define	TRB_TO_EP_ID(p)	(((p) >> 16) & 0x1f)

/* Completion Code - only applicable for some types of TRBs */
#define	COMP_CODE_MASK		(0xff << 24)
#define GET_COMP_CODE(p)	(((p) & COMP_CODE_MASK) >> 24)
#define COMP_SUCCESS	1
/* Data Buffer Error */
#define COMP_DB_ERR	2
/* Babble Detected Error */
#define COMP_BABBLE	3
/* USB Transaction Error */
#define COMP_TX_ERR	4
/* TRB Error - some TRB field is invalid */
#define COMP_TRB_ERR	5
/* Stall Error - USB device is stalled */
#define COMP_STALL	6
/* Resource Error - HC doesn't have memory for that device configuration */
#define COMP_ENOMEM	7
/* Bandwidth Error - not enough room in schedule for this dev config */
#define COMP_BW_ERR	8
/* No Slots Available Error - HC ran out of device slots */
#define COMP_ENOSLOTS	9
/* Invalid Stream Type Error */
#define COMP_STREAM_ERR	10
/* Slot Not Enabled Error - doorbell rung for disabled device slot */
#define COMP_EBADSLT	11
/* Endpoint Not Enabled Error */
#define COMP_EBADEP	12
/* Short Packet */
#define COMP_SHORT_TX	13
/* Ring Underrun - doorbell rung for an empty isoc OUT ep ring */
#define COMP_UNDERRUN	14
/* Ring Overrun - isoc IN ep ring is empty when ep is scheduled to RX */
#define COMP_OVERRUN	15
/* Virtual Function Event Ring Full Error */
#define COMP_VF_FULL	16
/* Parameter Error - Context parameter is invalid */
#define COMP_EINVAL	17
/* Bandwidth Overrun Error - isoc ep exceeded its allocated bandwidth */
#define COMP_BW_OVER	18
/* Context State Error - illegal context state transition requested */
#define COMP_CTX_STATE	19
/* No Ping Response Error - HC didn't get PING_RESPONSE in time to TX */
#define COMP_PING_ERR	20
/* Event Ring is full */
#define COMP_ER_FULL	21
/* Incompatible Device Error */
#define COMP_DEV_ERR	22
/* Missed Service Error - HC couldn't service an isoc ep within interval */
#define COMP_MISSED_INT	23
/* Successfully stopped command ring */
#define COMP_CMD_STOP	24
/* Successfully aborted current command and stopped command ring */
#define COMP_CMD_ABORT	25
/* Stopped - transfer was terminated by a stop endpoint command */
#define COMP_STOP	26
/* Same as COMP_EP_STOPPED, but the transferred length in the event is invalid */
#define COMP_STOP_INVAL	27
/* Control Abort Error - Debug Capability - control pipe aborted */
#define COMP_DBG_ABORT	28
/* Max Exit Latency Too Large Error */
#define COMP_MEL_ERR	29
/* TRB type 30 reserved */
/* Isoc Buffer Overrun - an isoc IN ep sent more data than could fit in TD */
#define COMP_BUFF_OVER	31
/* Event Lost Error - xHC has an "internal event overrun condition" */
#define COMP_ISSUES	32
/* Undefined Error - reported when other error codes don't apply */
#define COMP_UNKNOWN	33
/* Invalid Stream ID Error */
#define COMP_STRID_ERR	34
/* Secondary Bandwidth Error - may be returned by a Configure Endpoint cmd */
#define COMP_2ND_BW_ERR	35
/* Split Transaction Error */
#define	COMP_SPLIT_ERR	36

struct xhci_link_trb {
	/* 64-bit segment pointer*/
	__le64 segment_ptr;
	__le32 intr_target;
	__le32 control;
};

/* control bitfields */
#define LINK_TOGGLE	(0x1<<1)

/* Command completion event TRB */
struct xhci_event_cmd {
	/* Pointer to command TRB, or the value passed by the event data trb */
	__le64 cmd_trb;
	__le32 status;
	__le32 flags;
};

/* flags bitmasks */
/* bits 16:23 are the virtual function ID */
/* bits 24:31 are the slot ID */
#define TRB_TO_SLOT_ID(p)	(((p) & (0xff<<24)) >> 24)
#define SLOT_ID_FOR_TRB(p)	(((p) & 0xff) << 24)

/* Stop Endpoint TRB - ep_index to endpoint ID for this TRB */
#define TRB_TO_EP_INDEX(p)		((((p) & (0x1f << 16)) >> 16) - 1)
#define	EP_ID_FOR_TRB(p)		((((p) + 1) & 0x1f) << 16)

#define SUSPEND_PORT_FOR_TRB(p)		(((p) & 1) << 23)
#define TRB_TO_SUSPEND_PORT(p)		(((p) & (1 << 23)) >> 23)
#define LAST_EP_INDEX			30

/* Set TR Dequeue Pointer command TRB fields */
#define TRB_TO_STREAM_ID(p)		((((p) & (0xffff << 16)) >> 16))
#define STREAM_ID_FOR_TRB(p)		((((p)) & 0xffff) << 16)


/* Port Status Change Event TRB fields */
/* Port ID - bits 31:24 */
#define GET_PORT_ID(p)		(((p) & (0xff << 24)) >> 24)

/* Normal TRB fields */
/* transfer_len bitmasks - bits 0:16 */
#define	TRB_LEN(p)		((p) & 0x1ffff)
/* Interrupter Target - which MSI-X vector to target the completion event at */
#define TRB_INTR_TARGET(p)	(((p) & 0x3ff) << 22)
#define GET_INTR_TARGET(p)	(((p) >> 22) & 0x3ff)
#define TRB_TBC(p)		(((p) & 0x3) << 7)
#define TRB_TLBPC(p)		(((p) & 0xf) << 16)

/* Cycle bit - indicates TRB ownership by HC or HCD */
#define TRB_CYCLE		(1<<0)
/*
 * Force next event data TRB to be evaluated before task switch.
 * Used to pass OS data back after a TD completes.
 */
#define TRB_ENT			(1<<1)
/* Interrupt on short packet */
#define TRB_ISP			(1<<2)
/* Set PCIe no snoop attribute */
#define TRB_NO_SNOOP		(1<<3)
/* Chain multiple TRBs into a TD */
#define TRB_CHAIN		(1<<4)
/* Interrupt on completion */
#define TRB_IOC			(1<<5)
/* The buffer pointer contains immediate data */
#define TRB_IDT			(1<<6)

/* Block Event Interrupt */
#define	TRB_BEI			(1<<9)

/* Control transfer TRB specific fields */
#define TRB_DIR_IN		(1<<16)
#define	TRB_TX_TYPE(p)		((p) << 16)
#define	TRB_DATA_OUT		2
#define	TRB_DATA_IN		3

/* Isochronous TRB specific fields */
#define TRB_SIA			(1<<31)

struct xhci_generic_trb {
	__le32 field[4];
};

union xhci_trb {
	struct xhci_link_trb		link;
	struct xhci_transfer_event	trans_event;
	struct xhci_event_cmd		event_cmd;
	struct xhci_generic_trb		generic;
};

/* TRB bit mask */
#define	TRB_TYPE_BITMASK	(0xfc00)
#define TRB_TYPE(p)		((p) << 10)
#define TRB_FIELD_TO_TYPE(p)	(((p) & TRB_TYPE_BITMASK) >> 10)
/* TRB type IDs */
/* bulk, interrupt, isoc scatter/gather, and control data stage */
#define TRB_NORMAL		1
/* setup stage for control transfers */
#define TRB_SETUP		2
/* data stage for control transfers */
#define TRB_DATA		3
/* status stage for control transfers */
#define TRB_STATUS		4
/* isoc transfers */
#define TRB_ISOC		5
/* TRB for linking ring segments */
#define TRB_LINK		6
#define TRB_EVENT_DATA		7
/* Transfer Ring No-op (not for the command ring) */
#define TRB_TR_NOOP		8
/* Command TRBs */
/* Enable Slot Command */
#define TRB_ENABLE_SLOT		9
/* Disable Slot Command */
#define TRB_DISABLE_SLOT	10
/* Address Device Command */
#define TRB_ADDR_DEV		11
/* Configure Endpoint Command */
#define TRB_CONFIG_EP		12
/* Evaluate Context Command */
#define TRB_EVAL_CONTEXT	13
/* Reset Endpoint Command */
#define TRB_RESET_EP		14
/* Stop Transfer Ring Command */
#define TRB_STOP_RING		15
/* Set Transfer Ring Dequeue Pointer Command */
#define TRB_SET_DEQ		16
/* Reset Device Command */
#define TRB_RESET_DEV		17
/* Force Event Command (opt) */
#define TRB_FORCE_EVENT		18
/* Negotiate Bandwidth Command (opt) */
#define TRB_NEG_BANDWIDTH	19
/* Set Latency Tolerance Value Command (opt) */
#define TRB_SET_LT		20
/* Get port bandwidth Command */
#define TRB_GET_BW		21
/* Force Header Command - generate a transaction or link management packet */
#define TRB_FORCE_HEADER	22
/* No-op Command - not for transfer rings */
#define TRB_CMD_NOOP		23
/* TRB IDs 24-31 reserved */
/* Event TRBS */
/* Transfer Event */
#define TRB_TRANSFER		32
/* Command Completion Event */
#define TRB_COMPLETION		33
/* Port Status Change Event */
#define TRB_PORT_STATUS		34
/* Bandwidth Request Event (opt) */
#define TRB_BANDWIDTH_EVENT	35
/* Doorbell Event (opt) */
#define TRB_DOORBELL		36
/* Host Controller Event */
#define TRB_HC_EVENT		37
/* Device Notification Event - device sent function wake notification */
#define TRB_DEV_NOTE		38
/* MFINDEX Wrap Event - microframe counter wrapped */
#define TRB_MFINDEX_WRAP	39
/* TRB IDs 40-47 reserved, 48-63 is vendor-defined */

/* Nec vendor-specific command completion event. */
#define	TRB_NEC_CMD_COMP	48
/* Get NEC firmware revision. */
#define	TRB_NEC_GET_FW		49

#define TRB_TYPE_LINK(x)	(((x) & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK))
/* Above, but for __le32 types -- can avoid work by swapping constants: */
#define TRB_TYPE_LINK_LE32(x)	(((x) & cpu_to_le32(TRB_TYPE_BITMASK)) == \
				 cpu_to_le32(TRB_TYPE(TRB_LINK)))
#define TRB_TYPE_NOOP_LE32(x)	(((x) & cpu_to_le32(TRB_TYPE_BITMASK)) == \
				 cpu_to_le32(TRB_TYPE(TRB_TR_NOOP)))

#define NEC_FW_MINOR(p)		(((p) >> 0) & 0xff)
#define NEC_FW_MAJOR(p)		(((p) >> 8) & 0xff)

/*
 * TRBS_PER_SEGMENT must be a multiple of 4,
 * since the command ring is 64-byte aligned.
 * It must also be greater than 16.
 */
#define TRBS_PER_SEGMENT	64
/* Allow two commands + a link TRB, along with any reserved command TRBs */
#define MAX_RSVD_CMD_TRBS	(TRBS_PER_SEGMENT - 3)
#define SEGMENT_SIZE		(TRBS_PER_SEGMENT*16)
#define SEGMENT_SHIFT		(__ffs(SEGMENT_SIZE))
/* TRB buffer pointers can't cross 64KB boundaries */
#define TRB_MAX_BUFF_SHIFT		16
#define TRB_MAX_BUFF_SIZE	(1 << TRB_MAX_BUFF_SHIFT)

struct xhci_segment {
	union xhci_trb		*trbs;
	/* private to HCD */
	struct xhci_segment	*next;
	dma_addr_t		dma;
};

struct xhci_td {
	struct list_head	td_list;
	struct list_head	cancelled_td_list;
	struct urb		*urb;
	struct xhci_segment	*start_seg;
	union xhci_trb		*first_trb;
	union xhci_trb		*last_trb;
};

/* xHCI command default timeout value */
#define XHCI_CMD_DEFAULT_TIMEOUT	(5 * HZ)

/* command descriptor */
struct xhci_cd {
	struct list_head	cancel_cmd_list;
	struct xhci_command	*command;
	union xhci_trb		*cmd_trb;
};

struct xhci_dequeue_state {
	struct xhci_segment *new_deq_seg;
	union xhci_trb *new_deq_ptr;
	int new_cycle_state;
};

enum xhci_ring_type {
	TYPE_CTRL = 0,
	TYPE_ISOC,
	TYPE_BULK,
	TYPE_INTR,
	TYPE_STREAM,
	TYPE_COMMAND,
	TYPE_EVENT,
};

struct xhci_ring {
	struct xhci_segment	*first_seg;
	struct xhci_segment	*last_seg;
	union  xhci_trb		*enqueue;
	struct xhci_segment	*enq_seg;
	unsigned int		enq_updates;
	union  xhci_trb		*dequeue;
	struct xhci_segment	*deq_seg;
	unsigned int		deq_updates;
	struct list_head	td_list;
	/*
	 * Write the cycle state into the TRB cycle field to give ownership of
	 * the TRB to the host controller (if we are the producer), or to check
	 * if we own the TRB (if we are the consumer).  See section 4.9.1.
	 */
	u32			cycle_state;
	unsigned int		stream_id;
	unsigned int		num_segs;
	unsigned int		num_trbs_free;
	unsigned int		num_trbs_free_temp;
	enum xhci_ring_type	type;
	bool			last_td_was_short;
};

struct xhci_erst_entry {
	/* 64-bit event ring segment address */
	__le64	seg_addr;
	__le32	seg_size;
	/* Set to zero */
	__le32	rsvd;
};

struct xhci_erst {
	struct xhci_erst_entry	*entries;
	unsigned int		num_entries;
	/* xhci->event_ring keeps track of segment dma addresses */
	dma_addr_t		erst_dma_addr;
	/* Num entries the ERST can contain */
	unsigned int		erst_size;
};

struct xhci_scratchpad {
	u64 *sp_array;
	dma_addr_t sp_dma;
	void **sp_buffers;
	dma_addr_t *sp_dma_buffers;
};

struct urb_priv {
	int	length;
	int	td_cnt;
	struct	xhci_td	*td[0];
};

/*
 * Each segment table entry is 4*32bits long.  1K seems like an ok size:
 * (1K bytes * 8bytes/bit) / (4*32 bits) = 64 segment entries in the table,
 * meaning 64 ring segments.
 * Initial allocated size of the ERST, in number of entries */
#define	ERST_NUM_SEGS	1
/* Initial allocated size of the ERST, in number of entries */
#define	ERST_SIZE	64
/* Initial number of event segment rings allocated */
#define	ERST_ENTRIES	1
/* Poll every 60 seconds */
#define	POLL_TIMEOUT	60
/* Stop endpoint command timeout (secs) for URB cancellation watchdog timer */
#define XHCI_STOP_EP_CMD_TIMEOUT	5
/* XXX: Make these module parameters */

struct s3_save {
	u32	command;
	u32	dev_nt;
	u64	dcbaa_ptr;
	u32	config_reg;
	u32	irq_pending;
	u32	irq_control;
	u32	erst_size;
	u64	erst_base;
	u64	erst_dequeue;
};

/* Use for lpm */
struct dev_info {
	u32			dev_id;
	struct	list_head	list;
};

struct xhci_bus_state {
	unsigned long		bus_suspended;
	unsigned long		next_statechange;

	/* Port suspend arrays are indexed by the portnum of the fake roothub */
	/* ports suspend status arrays - max 31 ports for USB2, 15 for USB3 */
	u32			port_c_suspend;
	u32			suspended_ports;
	u32			port_remote_wakeup;
	unsigned long		resume_done[USB_MAXCHILDREN];
	/* which ports have started to resume */
	unsigned long		resuming_ports;
};

static inline unsigned int hcd_index(struct usb_hcd *hcd)
{
	if (hcd->speed == HCD_USB3)
		return 0;
	else
		return 1;
}

/* There is one xhci_hcd structure per controller */
struct xhci_hcd {
	struct usb_hcd *main_hcd;
	struct usb_hcd *shared_hcd;
	/* glue to PCI and HCD framework */
	struct xhci_cap_regs __iomem *cap_regs;
	struct xhci_op_regs __iomem *op_regs;
	struct xhci_run_regs __iomem *run_regs;
	struct xhci_doorbell_array __iomem *dba;
	/* Our HCD's current interrupter register set */
	struct	xhci_intr_reg __iomem *ir_set;

	/* Cached register copies of read-only HC data */
	__u32		hcs_params1;
	__u32		hcs_params2;
	__u32		hcs_params3;
	__u32		hcc_params;

	spinlock_t	lock;

	/* packed release number */
	u8		sbrn;
	u16		hci_version;
	u8		max_slots;
	u8		max_interrupters;
	u8		max_ports;
	u8		isoc_threshold;
	int		event_ring_max;
	int		addr_64;
	/* 4KB min, 128MB max */
	int		page_size;
	/* Valid values are 12 to 20, inclusive */
	int		page_shift;
	/* msi-x vectors */
	int		msix_count;
	struct msix_entry	*msix_entries;
	/* data structures */
	struct xhci_device_context_array *dcbaa;
	struct xhci_ring	*cmd_ring;
	unsigned int            cmd_ring_state;
#define CMD_RING_STATE_RUNNING         (1 << 0)
#define CMD_RING_STATE_ABORTED         (1 << 1)
#define CMD_RING_STATE_STOPPED         (1 << 2)
	struct list_head        cancel_cmd_list;
	unsigned int		cmd_ring_reserved_trbs;
	struct xhci_ring	*event_ring;
	struct xhci_erst	erst;
	/* Scratchpad */
	struct xhci_scratchpad  *scratchpad;
	/* Store LPM test failed devices' information */
	struct list_head	lpm_failed_devs;

	/* slot enabling and address device helpers */
	struct completion	addr_dev;
	int slot_id;
	/* For USB 3.0 LPM enable/disable. */
	struct xhci_command		*lpm_command;
	/* Internal mirror of the HW's dcbaa */
	struct xhci_virt_device	*devs[MAX_HC_SLOTS];
	/* For keeping track of bandwidth domains per roothub. */
	struct xhci_root_port_bw_info	*rh_bw;

	/* DMA pools */
	struct dma_pool	*device_pool;
	struct dma_pool	*segment_pool;
	struct dma_pool	*small_streams_pool;
	struct dma_pool	*medium_streams_pool;

#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
	/* Poll the rings - for debugging */
	struct timer_list	event_ring_timer;
	int			zombie;
#endif
	/* Host controller watchdog timer structures */
	unsigned int		xhc_state;

	u32			command;
	struct s3_save		s3;
/* Host controller is dying - not responding to commands. "I'm not dead yet!"
 *
 * xHC interrupts have been disabled and a watchdog timer will (or has already)
 * halt the xHCI host, and complete all URBs with an -ESHUTDOWN code.  Any code
 * that sees this status (other than the timer that set it) should stop touching
 * hardware immediately.  Interrupt handlers should return immediately when
 * they see this status (any time they drop and re-acquire xhci->lock).
 * xhci_urb_dequeue() should call usb_hcd_check_unlink_urb() and return without
 * putting the TD on the canceled list, etc.
 *
 * There are no reports of xHCI host controllers that display this issue.
 */
#define XHCI_STATE_DYING	(1 << 0)
#define XHCI_STATE_HALTED	(1 << 1)
	/* Statistics */
	int			error_bitmask;
	unsigned int		quirks;
#define	XHCI_LINK_TRB_QUIRK	(1 << 0)
#define XHCI_RESET_EP_QUIRK	(1 << 1)
#define XHCI_NEC_HOST		(1 << 2)
#define XHCI_AMD_PLL_FIX	(1 << 3)
#define XHCI_SPURIOUS_SUCCESS	(1 << 4)
/*
 * Certain Intel host controllers have a limit to the number of endpoint
 * contexts they can handle.  Ideally, they would signal that they can't handle
 * anymore endpoint contexts by returning a Resource Error for the Configure
 * Endpoint command, but they don't.  Instead they expect software to keep track
 * of the number of active endpoints for them, across configure endpoint
 * commands, reset device commands, disable slot commands, and address device
 * commands.
 */
#define XHCI_EP_LIMIT_QUIRK	(1 << 5)
#define XHCI_BROKEN_MSI		(1 << 6)
#define XHCI_RESET_ON_RESUME	(1 << 7)
#define	XHCI_SW_BW_CHECKING	(1 << 8)
#define XHCI_AMD_0x96_HOST	(1 << 9)
#define XHCI_TRUST_TX_LENGTH	(1 << 10)
#define XHCI_LPM_SUPPORT	(1 << 11)
#define XHCI_INTEL_HOST		(1 << 12)
#define XHCI_SPURIOUS_REBOOT	(1 << 13)
#define XHCI_COMP_MODE_QUIRK	(1 << 14)
#define XHCI_AVOID_BEI		(1 << 15)
	unsigned int		num_active_eps;
	unsigned int		limit_active_eps;
	/* There are two roothubs to keep track of bus suspend info for */
	struct xhci_bus_state   bus_state[2];
	/* Is each xHCI roothub port a USB 3.0, USB 2.0, or USB 1.1 port? */
	u8			*port_array;
	/* Array of pointers to USB 3.0 PORTSC registers */
	__le32 __iomem		**usb3_ports;
	unsigned int		num_usb3_ports;
	/* Array of pointers to USB 2.0 PORTSC registers */
	__le32 __iomem		**usb2_ports;
	unsigned int		num_usb2_ports;
	/* support xHCI 0.96 spec USB2 software LPM */
	unsigned		sw_lpm_support:1;
	/* support xHCI 1.0 spec USB2 hardware LPM */
	unsigned		hw_lpm_support:1;
	/* Compliance Mode Recovery Data */
	struct timer_list	comp_mode_recovery_timer;
	u32			port_status_u0;
/* Compliance Mode Timer Triggered every 2 seconds */
#define COMP_MODE_RCVRY_MSECS 2000
};

/* convert between an HCD pointer and the corresponding EHCI_HCD */
static inline struct xhci_hcd *hcd_to_xhci(struct usb_hcd *hcd)
{
	return *((struct xhci_hcd **) (hcd->hcd_priv));
}

static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci)
{
	return xhci->main_hcd;
}

#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
#define XHCI_DEBUG	1
#else
#define XHCI_DEBUG	0
#endif

#define xhci_dbg(xhci, fmt, args...) \
	do { if (XHCI_DEBUG) dev_dbg(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
#define xhci_info(xhci, fmt, args...) \
	do { if (XHCI_DEBUG) dev_info(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
#define xhci_err(xhci, fmt, args...) \
	dev_err(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
#define xhci_warn(xhci, fmt, args...) \
	dev_warn(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
#define xhci_warn_ratelimited(xhci, fmt, args...) \
	dev_warn_ratelimited(xhci_to_hcd(xhci)->self.controller , fmt , ## args)

/* TODO: copied from ehci.h - can be refactored? */
/* xHCI spec says all registers are little endian */
static inline unsigned int xhci_readl(const struct xhci_hcd *xhci,
		__le32 __iomem *regs)
{
	return readl(regs);
}
static inline void xhci_writel(struct xhci_hcd *xhci,
		const unsigned int val, __le32 __iomem *regs)
{
	writel(val, regs);
}

/*
 * Registers should always be accessed with double word or quad word accesses.
 *
 * Some xHCI implementations may support 64-bit address pointers.  Registers
 * with 64-bit address pointers should be written to with dword accesses by
 * writing the low dword first (ptr[0]), then the high dword (ptr[1]) second.
 * xHCI implementations that do not support 64-bit address pointers will ignore
 * the high dword, and write order is irrelevant.
 */
static inline u64 xhci_read_64(const struct xhci_hcd *xhci,
		__le64 __iomem *regs)
{
	__u32 __iomem *ptr = (__u32 __iomem *) regs;
	u64 val_lo = readl(ptr);
	u64 val_hi = readl(ptr + 1);
	return val_lo + (val_hi << 32);
}
static inline void xhci_write_64(struct xhci_hcd *xhci,
				 const u64 val, __le64 __iomem *regs)
{
	__u32 __iomem *ptr = (__u32 __iomem *) regs;
	u32 val_lo = lower_32_bits(val);
	u32 val_hi = upper_32_bits(val);

	writel(val_lo, ptr);
	writel(val_hi, ptr + 1);
}

static inline int xhci_link_trb_quirk(struct xhci_hcd *xhci)
{
	return xhci->quirks & XHCI_LINK_TRB_QUIRK;
}

/* xHCI debugging */
void xhci_print_ir_set(struct xhci_hcd *xhci, int set_num);
void xhci_print_registers(struct xhci_hcd *xhci);
void xhci_dbg_regs(struct xhci_hcd *xhci);
void xhci_print_run_regs(struct xhci_hcd *xhci);
void xhci_print_trb_offsets(struct xhci_hcd *xhci, union xhci_trb *trb);
void xhci_debug_trb(struct xhci_hcd *xhci, union xhci_trb *trb);
void xhci_debug_segment(struct xhci_hcd *xhci, struct xhci_segment *seg);
void xhci_debug_ring(struct xhci_hcd *xhci, struct xhci_ring *ring);
void xhci_dbg_erst(struct xhci_hcd *xhci, struct xhci_erst *erst);
void xhci_dbg_cmd_ptrs(struct xhci_hcd *xhci);
void xhci_dbg_ring_ptrs(struct xhci_hcd *xhci, struct xhci_ring *ring);
void xhci_dbg_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx, unsigned int last_ep);
char *xhci_get_slot_state(struct xhci_hcd *xhci,
		struct xhci_container_ctx *ctx);
void xhci_dbg_ep_rings(struct xhci_hcd *xhci,
		unsigned int slot_id, unsigned int ep_index,
		struct xhci_virt_ep *ep);

/* xHCI memory management */
void xhci_mem_cleanup(struct xhci_hcd *xhci);
int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags);
void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id);
int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id, struct usb_device *udev, gfp_t flags);
int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *udev);
void xhci_copy_ep0_dequeue_into_input_ctx(struct xhci_hcd *xhci,
		struct usb_device *udev);
unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc);
unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc);
unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index);
unsigned int xhci_last_valid_endpoint(u32 added_ctxs);
void xhci_endpoint_zero(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, struct usb_host_endpoint *ep);
void xhci_drop_ep_from_interval_table(struct xhci_hcd *xhci,
		struct xhci_bw_info *ep_bw,
		struct xhci_interval_bw_table *bw_table,
		struct usb_device *udev,
		struct xhci_virt_ep *virt_ep,
		struct xhci_tt_bw_info *tt_info);
void xhci_update_tt_active_eps(struct xhci_hcd *xhci,
		struct xhci_virt_device *virt_dev,
		int old_active_eps);
void xhci_clear_endpoint_bw_info(struct xhci_bw_info *bw_info);
void xhci_update_bw_info(struct xhci_hcd *xhci,
		struct xhci_container_ctx *in_ctx,
		struct xhci_input_control_ctx *ctrl_ctx,
		struct xhci_virt_device *virt_dev);
void xhci_endpoint_copy(struct xhci_hcd *xhci,
		struct xhci_container_ctx *in_ctx,
		struct xhci_container_ctx *out_ctx,
		unsigned int ep_index);
void xhci_slot_copy(struct xhci_hcd *xhci,
		struct xhci_container_ctx *in_ctx,
		struct xhci_container_ctx *out_ctx);
int xhci_endpoint_init(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev,
		struct usb_device *udev, struct usb_host_endpoint *ep,
		gfp_t mem_flags);
void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring);
int xhci_ring_expansion(struct xhci_hcd *xhci, struct xhci_ring *ring,
				unsigned int num_trbs, gfp_t flags);
void xhci_free_or_cache_endpoint_ring(struct xhci_hcd *xhci,
		struct xhci_virt_device *virt_dev,
		unsigned int ep_index);
struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
		unsigned int num_stream_ctxs,
		unsigned int num_streams, gfp_t flags);
void xhci_free_stream_info(struct xhci_hcd *xhci,
		struct xhci_stream_info *stream_info);
void xhci_setup_streams_ep_input_ctx(struct xhci_hcd *xhci,
		struct xhci_ep_ctx *ep_ctx,
		struct xhci_stream_info *stream_info);
void xhci_setup_no_streams_ep_input_ctx(struct xhci_hcd *xhci,
		struct xhci_ep_ctx *ep_ctx,
		struct xhci_virt_ep *ep);
void xhci_free_device_endpoint_resources(struct xhci_hcd *xhci,
	struct xhci_virt_device *virt_dev, bool drop_control_ep);
struct xhci_ring *xhci_dma_to_transfer_ring(
		struct xhci_virt_ep *ep,
		u64 address);
struct xhci_ring *xhci_stream_id_to_ring(
		struct xhci_virt_device *dev,
		unsigned int ep_index,
		unsigned int stream_id);
struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci,
		bool allocate_in_ctx, bool allocate_completion,
		gfp_t mem_flags);
void xhci_urb_free_priv(struct xhci_hcd *xhci, struct urb_priv *urb_priv);
void xhci_free_command(struct xhci_hcd *xhci,
		struct xhci_command *command);

#ifdef CONFIG_PCI
/* xHCI PCI glue */
int xhci_register_pci(void);
void xhci_unregister_pci(void);
#else
static inline int xhci_register_pci(void) { return 0; }
static inline void xhci_unregister_pci(void) {}
#endif

#if defined(CONFIG_USB_XHCI_PLATFORM) \
	|| defined(CONFIG_USB_XHCI_PLATFORM_MODULE)
int xhci_register_plat(void);
void xhci_unregister_plat(void);
#else
static inline int xhci_register_plat(void)
{ return 0; }
static inline void xhci_unregister_plat(void)
{  }
#endif

/* xHCI host controller glue */
typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *);
int xhci_handshake(struct xhci_hcd *xhci, void __iomem *ptr,
		u32 mask, u32 done, int usec);
void xhci_quiesce(struct xhci_hcd *xhci);
int xhci_halt(struct xhci_hcd *xhci);
int xhci_reset(struct xhci_hcd *xhci);
int xhci_init(struct usb_hcd *hcd);
int xhci_run(struct usb_hcd *hcd);
void xhci_stop(struct usb_hcd *hcd);
void xhci_shutdown(struct usb_hcd *hcd);
int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks);

#ifdef	CONFIG_PM
int xhci_suspend(struct xhci_hcd *xhci);
int xhci_resume(struct xhci_hcd *xhci, bool hibernated);
#else
#define	xhci_suspend	NULL
#define	xhci_resume	NULL
#endif

int xhci_get_frame(struct usb_hcd *hcd);
irqreturn_t xhci_irq(struct usb_hcd *hcd);
irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd);
int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev);
void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev);
int xhci_alloc_tt_info(struct xhci_hcd *xhci,
		struct xhci_virt_device *virt_dev,
		struct usb_device *hdev,
		struct usb_tt *tt, gfp_t mem_flags);
int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
		struct usb_host_endpoint **eps, unsigned int num_eps,
		unsigned int num_streams, gfp_t mem_flags);
int xhci_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
		struct usb_host_endpoint **eps, unsigned int num_eps,
		gfp_t mem_flags);
int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev);
int xhci_update_device(struct usb_hcd *hcd, struct usb_device *udev);
int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
				struct usb_device *udev, int enable);
int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
			struct usb_tt *tt, gfp_t mem_flags);
int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags);
int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev, struct usb_host_endpoint *ep);
int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev, struct usb_host_endpoint *ep);
void xhci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep);
int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev);
int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);

/* xHCI ring, segment, TRB, and TD functions */
dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, union xhci_trb *trb);
struct xhci_segment *trb_in_td(struct xhci_segment *start_seg,
		union xhci_trb *start_trb, union xhci_trb *end_trb,
		dma_addr_t suspect_dma);
int xhci_is_vendor_info_code(struct xhci_hcd *xhci, unsigned int trb_comp_code);
void xhci_ring_cmd_db(struct xhci_hcd *xhci);
int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id);
int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
		u32 slot_id);
int xhci_queue_vendor_command(struct xhci_hcd *xhci,
		u32 field1, u32 field2, u32 field3, u32 field4);
int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id,
		unsigned int ep_index, int suspend);
int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,
		int slot_id, unsigned int ep_index);
int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,
		int slot_id, unsigned int ep_index);
int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,
		int slot_id, unsigned int ep_index);
int xhci_queue_isoc_tx_prepare(struct xhci_hcd *xhci, gfp_t mem_flags,
		struct urb *urb, int slot_id, unsigned int ep_index);
int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
		u32 slot_id, bool command_must_succeed);
int xhci_queue_evaluate_context(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
		u32 slot_id, bool command_must_succeed);
int xhci_queue_reset_ep(struct xhci_hcd *xhci, int slot_id,
		unsigned int ep_index);
int xhci_queue_reset_device(struct xhci_hcd *xhci, u32 slot_id);
void xhci_find_new_dequeue_state(struct xhci_hcd *xhci,
		unsigned int slot_id, unsigned int ep_index,
		unsigned int stream_id, struct xhci_td *cur_td,
		struct xhci_dequeue_state *state);
void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
		unsigned int slot_id, unsigned int ep_index,
		unsigned int stream_id,
		struct xhci_dequeue_state *deq_state);
void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
		struct usb_device *udev, unsigned int ep_index);
void xhci_queue_config_ep_quirk(struct xhci_hcd *xhci,
		unsigned int slot_id, unsigned int ep_index,
		struct xhci_dequeue_state *deq_state);
void xhci_stop_endpoint_command_watchdog(unsigned long arg);
int xhci_cancel_cmd(struct xhci_hcd *xhci, struct xhci_command *command,
		union xhci_trb *cmd_trb);
void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id,
		unsigned int ep_index, unsigned int stream_id);

/* xHCI roothub code */
void xhci_set_link_state(struct xhci_hcd *xhci, __le32 __iomem **port_array,
				int port_id, u32 link_state);
int xhci_enable_usb3_lpm_timeout(struct usb_hcd *hcd,
			struct usb_device *udev, enum usb3_link_state state);
int xhci_disable_usb3_lpm_timeout(struct usb_hcd *hcd,
			struct usb_device *udev, enum usb3_link_state state);
void xhci_test_and_clear_bit(struct xhci_hcd *xhci, __le32 __iomem **port_array,
				int port_id, u32 port_bit);
int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex,
		char *buf, u16 wLength);
int xhci_hub_status_data(struct usb_hcd *hcd, char *buf);

#ifdef CONFIG_PM
int xhci_bus_suspend(struct usb_hcd *hcd);
int xhci_bus_resume(struct usb_hcd *hcd);
#else
#define	xhci_bus_suspend	NULL
#define	xhci_bus_resume		NULL
#endif	/* CONFIG_PM */

u32 xhci_port_state_to_neutral(u32 state);
int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
		u16 port);
void xhci_ring_device(struct xhci_hcd *xhci, int slot_id);

/* xHCI contexts */
struct xhci_input_control_ctx *xhci_get_input_control_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx);
struct xhci_slot_ctx *xhci_get_slot_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx);
struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx, unsigned int ep_index);

#endif /* __LINUX_XHCI_HCD_H */