aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/3w-sas.c
blob: 6a95d111d207269a920fc57c8ceee220ac5d42d8 (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
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
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
/*
   3w-sas.c -- LSI 3ware SAS/SATA-RAID Controller device driver for Linux.

   Written By: Adam Radford <linuxraid@lsi.com>

   Copyright (C) 2009 LSI Corporation.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   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.

   NO WARRANTY
   THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
   LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
   solely responsible for determining the appropriateness of using and
   distributing the Program and assumes all risks associated with its
   exercise of rights under this Agreement, including but not limited to
   the risks and costs of program errors, damage to or loss of data,
   programs or equipment, and unavailability or interruption of operations.

   DISCLAIMER OF LIABILITY
   NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), 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 OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
   HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES

   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

   Controllers supported by this driver:

   LSI 3ware 9750 6Gb/s SAS/SATA-RAID

   Bugs/Comments/Suggestions should be mailed to:
   linuxraid@lsi.com

   For more information, goto:
   http://www.lsi.com

   History
   -------
   3.26.02.000 - Initial driver release.
*/

#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/moduleparam.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/time.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_cmnd.h>
#include "3w-sas.h"

/* Globals */
#define TW_DRIVER_VERSION "3.26.02.000"
static DEFINE_MUTEX(twl_chrdev_mutex);
static TW_Device_Extension *twl_device_extension_list[TW_MAX_SLOT];
static unsigned int twl_device_extension_count;
static int twl_major = -1;
extern struct timezone sys_tz;

/* Module parameters */
MODULE_AUTHOR ("LSI");
MODULE_DESCRIPTION ("LSI 3ware SAS/SATA-RAID Linux Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(TW_DRIVER_VERSION);

static int use_msi;
module_param(use_msi, int, S_IRUGO);
MODULE_PARM_DESC(use_msi, "Use Message Signaled Interrupts. Default: 0");

/* Function prototypes */
static int twl_reset_device_extension(TW_Device_Extension *tw_dev, int ioctl_reset);

/* Functions */

/* This function returns AENs through sysfs */
static ssize_t twl_sysfs_aen_read(struct file *filp, struct kobject *kobj,
				  struct bin_attribute *bin_attr,
				  char *outbuf, loff_t offset, size_t count)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct Scsi_Host *shost = class_to_shost(dev);
	TW_Device_Extension *tw_dev = (TW_Device_Extension *)shost->hostdata;
	unsigned long flags = 0;
	ssize_t ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	spin_lock_irqsave(tw_dev->host->host_lock, flags);
	ret = memory_read_from_buffer(outbuf, count, &offset, tw_dev->event_queue[0], sizeof(TW_Event) * TW_Q_LENGTH);
	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);

	return ret;
} /* End twl_sysfs_aen_read() */

/* aen_read sysfs attribute initializer */
static struct bin_attribute twl_sysfs_aen_read_attr = {
	.attr = {
		.name = "3ware_aen_read",
		.mode = S_IRUSR,
	}, 
	.size = 0,
	.read = twl_sysfs_aen_read
};

/* This function returns driver compatibility info through sysfs */
static ssize_t twl_sysfs_compat_info(struct file *filp, struct kobject *kobj,
				     struct bin_attribute *bin_attr,
				     char *outbuf, loff_t offset, size_t count)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct Scsi_Host *shost = class_to_shost(dev);
	TW_Device_Extension *tw_dev = (TW_Device_Extension *)shost->hostdata;
	unsigned long flags = 0;
	ssize_t ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	spin_lock_irqsave(tw_dev->host->host_lock, flags);
	ret = memory_read_from_buffer(outbuf, count, &offset, &tw_dev->tw_compat_info, sizeof(TW_Compatibility_Info));
	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);

	return ret;
} /* End twl_sysfs_compat_info() */

/* compat_info sysfs attribute initializer */
static struct bin_attribute twl_sysfs_compat_info_attr = {
	.attr = {
		.name = "3ware_compat_info",
		.mode = S_IRUSR,
	}, 
	.size = 0,
	.read = twl_sysfs_compat_info
};

/* Show some statistics about the card */
static ssize_t twl_show_stats(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct Scsi_Host *host = class_to_shost(dev);
	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
	unsigned long flags = 0;
	ssize_t len;

	spin_lock_irqsave(tw_dev->host->host_lock, flags);
	len = snprintf(buf, PAGE_SIZE, "3w-sas Driver version: %s\n"
		       "Current commands posted:   %4d\n"
		       "Max commands posted:       %4d\n"
		       "Last sgl length:           %4d\n"
		       "Max sgl length:            %4d\n"
		       "Last sector count:         %4d\n"
		       "Max sector count:          %4d\n"
		       "SCSI Host Resets:          %4d\n"
		       "AEN's:                     %4d\n", 
		       TW_DRIVER_VERSION,
		       tw_dev->posted_request_count,
		       tw_dev->max_posted_request_count,
		       tw_dev->sgl_entries,
		       tw_dev->max_sgl_entries,
		       tw_dev->sector_count,
		       tw_dev->max_sector_count,
		       tw_dev->num_resets,
		       tw_dev->aen_count);
	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
	return len;
} /* End twl_show_stats() */

/* This function will set a devices queue depth */
static int twl_change_queue_depth(struct scsi_device *sdev, int queue_depth,
				  int reason)
{
	if (reason != SCSI_QDEPTH_DEFAULT)
		return -EOPNOTSUPP;

	if (queue_depth > TW_Q_LENGTH-2)
		queue_depth = TW_Q_LENGTH-2;
	scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, queue_depth);
	return queue_depth;
} /* End twl_change_queue_depth() */

/* stats sysfs attribute initializer */
static struct device_attribute twl_host_stats_attr = {
	.attr = {
		.name = 	"3ware_stats",
		.mode =		S_IRUGO,
	},
	.show = twl_show_stats
};

/* Host attributes initializer */
static struct device_attribute *twl_host_attrs[] = {
	&twl_host_stats_attr,
	NULL,
};

/* This function will look up an AEN severity string */
static char *twl_aen_severity_lookup(unsigned char severity_code)
{
	char *retval = NULL;

	if ((severity_code < (unsigned char) TW_AEN_SEVERITY_ERROR) ||
	    (severity_code > (unsigned char) TW_AEN_SEVERITY_DEBUG))
		goto out;

	retval = twl_aen_severity_table[severity_code];
out:
	return retval;
} /* End twl_aen_severity_lookup() */

/* This function will queue an event */
static void twl_aen_queue_event(TW_Device_Extension *tw_dev, TW_Command_Apache_Header *header)
{
	u32 local_time;
	struct timeval time;
	TW_Event *event;
	unsigned short aen;
	char host[16];
	char *error_str;

	tw_dev->aen_count++;

	/* Fill out event info */
	event = tw_dev->event_queue[tw_dev->error_index];

	host[0] = '\0';
	if (tw_dev->host)
		sprintf(host, " scsi%d:", tw_dev->host->host_no);

	aen = le16_to_cpu(header->status_block.error);
	memset(event, 0, sizeof(TW_Event));

	event->severity = TW_SEV_OUT(header->status_block.severity__reserved);
	do_gettimeofday(&time);
	local_time = (u32)(time.tv_sec - (sys_tz.tz_minuteswest * 60));
	event->time_stamp_sec = local_time;
	event->aen_code = aen;
	event->retrieved = TW_AEN_NOT_RETRIEVED;
	event->sequence_id = tw_dev->error_sequence_id;
	tw_dev->error_sequence_id++;

	/* Check for embedded error string */
	error_str = &(header->err_specific_desc[strlen(header->err_specific_desc)+1]);

	header->err_specific_desc[sizeof(header->err_specific_desc) - 1] = '\0';
	event->parameter_len = strlen(header->err_specific_desc);
	memcpy(event->parameter_data, header->err_specific_desc, event->parameter_len + 1 + strlen(error_str));
	if (event->severity != TW_AEN_SEVERITY_DEBUG)
		printk(KERN_WARNING "3w-sas:%s AEN: %s (0x%02X:0x%04X): %s:%s.\n",
		       host,
		       twl_aen_severity_lookup(TW_SEV_OUT(header->status_block.severity__reserved)),
		       TW_MESSAGE_SOURCE_CONTROLLER_EVENT, aen, error_str,
		       header->err_specific_desc);
	else
		tw_dev->aen_count--;

	tw_dev->error_index = (tw_dev->error_index + 1 ) % TW_Q_LENGTH;
} /* End twl_aen_queue_event() */

/* This function will attempt to post a command packet to the board */
static int twl_post_command_packet(TW_Device_Extension *tw_dev, int request_id)
{
	dma_addr_t command_que_value;

	command_que_value = tw_dev->command_packet_phys[request_id];
	command_que_value += TW_COMMAND_OFFSET;

	/* First write upper 4 bytes */
	writel((u32)((u64)command_que_value >> 32), TWL_HIBQPH_REG_ADDR(tw_dev));
	/* Then the lower 4 bytes */
	writel((u32)(command_que_value | TWL_PULL_MODE), TWL_HIBQPL_REG_ADDR(tw_dev));

	tw_dev->state[request_id] = TW_S_POSTED;
	tw_dev->posted_request_count++;
	if (tw_dev->posted_request_count > tw_dev->max_posted_request_count)
		tw_dev->max_posted_request_count = tw_dev->posted_request_count;

	return 0;
} /* End twl_post_command_packet() */

/* This function will perform a pci-dma mapping for a scatter gather list */
static int twl_map_scsi_sg_data(TW_Device_Extension *tw_dev, int request_id)
{
	int use_sg;
	struct scsi_cmnd *cmd = tw_dev->srb[request_id];

	use_sg = scsi_dma_map(cmd);
	if (!use_sg)
		return 0;
	else if (use_sg < 0) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1, "Failed to map scatter gather list");
		return 0;
	}

	cmd->SCp.phase = TW_PHASE_SGLIST;
	cmd->SCp.have_data_in = use_sg;

	return use_sg;
} /* End twl_map_scsi_sg_data() */

/* This function hands scsi cdb's to the firmware */
static int twl_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id, char *cdb, int use_sg, TW_SG_Entry_ISO *sglistarg)
{
	TW_Command_Full *full_command_packet;
	TW_Command_Apache *command_packet;
	int i, sg_count;
	struct scsi_cmnd *srb = NULL;
	struct scatterlist *sglist = NULL, *sg;
	int retval = 1;

	if (tw_dev->srb[request_id]) {
		srb = tw_dev->srb[request_id];
		if (scsi_sglist(srb))
			sglist = scsi_sglist(srb);
	}

	/* Initialize command packet */
	full_command_packet = tw_dev->command_packet_virt[request_id];
	full_command_packet->header.header_desc.size_header = 128;
	full_command_packet->header.status_block.error = 0;
	full_command_packet->header.status_block.severity__reserved = 0;

	command_packet = &full_command_packet->command.newcommand;
	command_packet->status = 0;
	command_packet->opcode__reserved = TW_OPRES_IN(0, TW_OP_EXECUTE_SCSI);

	/* We forced 16 byte cdb use earlier */
	if (!cdb)
		memcpy(command_packet->cdb, srb->cmnd, TW_MAX_CDB_LEN);
	else
		memcpy(command_packet->cdb, cdb, TW_MAX_CDB_LEN);

	if (srb) {
		command_packet->unit = srb->device->id;
		command_packet->request_id__lunl =
			cpu_to_le16(TW_REQ_LUN_IN(srb->device->lun, request_id));
	} else {
		command_packet->request_id__lunl =
			cpu_to_le16(TW_REQ_LUN_IN(0, request_id));
		command_packet->unit = 0;
	}

	command_packet->sgl_offset = 16;

	if (!sglistarg) {
		/* Map sglist from scsi layer to cmd packet */
		if (scsi_sg_count(srb)) {
			sg_count = twl_map_scsi_sg_data(tw_dev, request_id);
			if (sg_count == 0)
				goto out;

			scsi_for_each_sg(srb, sg, sg_count, i) {
				command_packet->sg_list[i].address = TW_CPU_TO_SGL(sg_dma_address(sg));
				command_packet->sg_list[i].length = TW_CPU_TO_SGL(sg_dma_len(sg));
			}
			command_packet->sgl_entries__lunh = cpu_to_le16(TW_REQ_LUN_IN((srb->device->lun >> 4), scsi_sg_count(tw_dev->srb[request_id])));
		}
	} else {
		/* Internal cdb post */
		for (i = 0; i < use_sg; i++) {
			command_packet->sg_list[i].address = TW_CPU_TO_SGL(sglistarg[i].address);
			command_packet->sg_list[i].length = TW_CPU_TO_SGL(sglistarg[i].length);
		}
		command_packet->sgl_entries__lunh = cpu_to_le16(TW_REQ_LUN_IN(0, use_sg));
	}

	/* Update some stats */
	if (srb) {
		tw_dev->sector_count = scsi_bufflen(srb) / 512;
		if (tw_dev->sector_count > tw_dev->max_sector_count)
			tw_dev->max_sector_count = tw_dev->sector_count;
		tw_dev->sgl_entries = scsi_sg_count(srb);
		if (tw_dev->sgl_entries > tw_dev->max_sgl_entries)
			tw_dev->max_sgl_entries = tw_dev->sgl_entries;
	}

	/* Now post the command to the board */
	retval = twl_post_command_packet(tw_dev, request_id);

out:
	return retval;
} /* End twl_scsiop_execute_scsi() */

/* This function will read the aen queue from the isr */
static int twl_aen_read_queue(TW_Device_Extension *tw_dev, int request_id)
{
	char cdb[TW_MAX_CDB_LEN];
	TW_SG_Entry_ISO sglist[1];
	TW_Command_Full *full_command_packet;
	int retval = 1;

	full_command_packet = tw_dev->command_packet_virt[request_id];
	memset(full_command_packet, 0, sizeof(TW_Command_Full));

	/* Initialize cdb */
	memset(&cdb, 0, TW_MAX_CDB_LEN);
	cdb[0] = REQUEST_SENSE; /* opcode */
	cdb[4] = TW_ALLOCATION_LENGTH; /* allocation length */

	/* Initialize sglist */
	memset(&sglist, 0, sizeof(TW_SG_Entry_ISO));
	sglist[0].length = TW_SECTOR_SIZE;
	sglist[0].address = tw_dev->generic_buffer_phys[request_id];

	/* Mark internal command */
	tw_dev->srb[request_id] = NULL;

	/* Now post the command packet */
	if (twl_scsiop_execute_scsi(tw_dev, request_id, cdb, 1, sglist)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x2, "Post failed while reading AEN queue");
		goto out;
	}
	retval = 0;
out:
	return retval;
} /* End twl_aen_read_queue() */

/* This function will sync firmware time with the host time */
static void twl_aen_sync_time(TW_Device_Extension *tw_dev, int request_id)
{
	u32 schedulertime;
	struct timeval utc;
	TW_Command_Full *full_command_packet;
	TW_Command *command_packet;
	TW_Param_Apache *param;
	u32 local_time;

	/* Fill out the command packet */
	full_command_packet = tw_dev->command_packet_virt[request_id];
	memset(full_command_packet, 0, sizeof(TW_Command_Full));
	command_packet = &full_command_packet->command.oldcommand;
	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_SET_PARAM);
	command_packet->request_id = request_id;
	command_packet->byte8_offset.param.sgl[0].address = TW_CPU_TO_SGL(tw_dev->generic_buffer_phys[request_id]);
	command_packet->byte8_offset.param.sgl[0].length = TW_CPU_TO_SGL(TW_SECTOR_SIZE);
	command_packet->size = TW_COMMAND_SIZE;
	command_packet->byte6_offset.parameter_count = cpu_to_le16(1);

	/* Setup the param */
	param = (TW_Param_Apache *)tw_dev->generic_buffer_virt[request_id];
	memset(param, 0, TW_SECTOR_SIZE);
	param->table_id = cpu_to_le16(TW_TIMEKEEP_TABLE | 0x8000); /* Controller time keep table */
	param->parameter_id = cpu_to_le16(0x3); /* SchedulerTime */
	param->parameter_size_bytes = cpu_to_le16(4);

	/* Convert system time in UTC to local time seconds since last 
           Sunday 12:00AM */
	do_gettimeofday(&utc);
	local_time = (u32)(utc.tv_sec - (sys_tz.tz_minuteswest * 60));
	schedulertime = local_time - (3 * 86400);
	schedulertime = cpu_to_le32(schedulertime % 604800);

	memcpy(param->data, &schedulertime, sizeof(u32));

	/* Mark internal command */
	tw_dev->srb[request_id] = NULL;

	/* Now post the command */
	twl_post_command_packet(tw_dev, request_id);
} /* End twl_aen_sync_time() */

/* This function will assign an available request id */
static void twl_get_request_id(TW_Device_Extension *tw_dev, int *request_id)
{
	*request_id = tw_dev->free_queue[tw_dev->free_head];
	tw_dev->free_head = (tw_dev->free_head + 1) % TW_Q_LENGTH;
	tw_dev->state[*request_id] = TW_S_STARTED;
} /* End twl_get_request_id() */

/* This function will free a request id */
static void twl_free_request_id(TW_Device_Extension *tw_dev, int request_id)
{
	tw_dev->free_queue[tw_dev->free_tail] = request_id;
	tw_dev->state[request_id] = TW_S_FINISHED;
	tw_dev->free_tail = (tw_dev->free_tail + 1) % TW_Q_LENGTH;
} /* End twl_free_request_id() */

/* This function will complete an aen request from the isr */
static int twl_aen_complete(TW_Device_Extension *tw_dev, int request_id)
{
	TW_Command_Full *full_command_packet;
	TW_Command *command_packet;
	TW_Command_Apache_Header *header;
	unsigned short aen;
	int retval = 1;

	header = (TW_Command_Apache_Header *)tw_dev->generic_buffer_virt[request_id];
	tw_dev->posted_request_count--;
	aen = le16_to_cpu(header->status_block.error);
	full_command_packet = tw_dev->command_packet_virt[request_id];
	command_packet = &full_command_packet->command.oldcommand;

	/* First check for internal completion of set param for time sync */
	if (TW_OP_OUT(command_packet->opcode__sgloffset) == TW_OP_SET_PARAM) {
		/* Keep reading the queue in case there are more aen's */
		if (twl_aen_read_queue(tw_dev, request_id))
			goto out2;
	        else {
			retval = 0;
			goto out;
		}
	}

	switch (aen) {
	case TW_AEN_QUEUE_EMPTY:
		/* Quit reading the queue if this is the last one */
		break;
	case TW_AEN_SYNC_TIME_WITH_HOST:
		twl_aen_sync_time(tw_dev, request_id);
		retval = 0;
		goto out;
	default:
		twl_aen_queue_event(tw_dev, header);

		/* If there are more aen's, keep reading the queue */
		if (twl_aen_read_queue(tw_dev, request_id))
			goto out2;
		else {
			retval = 0;
			goto out;
		}
	}
	retval = 0;
out2:
	tw_dev->state[request_id] = TW_S_COMPLETED;
	twl_free_request_id(tw_dev, request_id);
	clear_bit(TW_IN_ATTENTION_LOOP, &tw_dev->flags);
out:
	return retval;
} /* End twl_aen_complete() */

/* This function will poll for a response */
static int twl_poll_response(TW_Device_Extension *tw_dev, int request_id, int seconds)
{
	unsigned long before;
	dma_addr_t mfa;
	u32 regh, regl;
	u32 response;
	int retval = 1;
	int found = 0;

	before = jiffies;

	while (!found) {
		if (sizeof(dma_addr_t) > 4) {
			regh = readl(TWL_HOBQPH_REG_ADDR(tw_dev));
			regl = readl(TWL_HOBQPL_REG_ADDR(tw_dev));
			mfa = ((u64)regh << 32) | regl;
		} else
			mfa = readl(TWL_HOBQPL_REG_ADDR(tw_dev));

		response = (u32)mfa;

		if (TW_RESID_OUT(response) == request_id)
			found = 1;

		if (time_after(jiffies, before + HZ * seconds))
			goto out;

		msleep(50);
	}
	retval = 0;
out: 
	return retval;
} /* End twl_poll_response() */

/* This function will drain the aen queue */
static int twl_aen_drain_queue(TW_Device_Extension *tw_dev, int no_check_reset)
{
	int request_id = 0;
	char cdb[TW_MAX_CDB_LEN];
	TW_SG_Entry_ISO sglist[1];
	int finished = 0, count = 0;
	TW_Command_Full *full_command_packet;
	TW_Command_Apache_Header *header;
	unsigned short aen;
	int first_reset = 0, queue = 0, retval = 1;

	if (no_check_reset)
		first_reset = 0;
	else
		first_reset = 1;

	full_command_packet = tw_dev->command_packet_virt[request_id];
	memset(full_command_packet, 0, sizeof(TW_Command_Full));

	/* Initialize cdb */
	memset(&cdb, 0, TW_MAX_CDB_LEN);
	cdb[0] = REQUEST_SENSE; /* opcode */
	cdb[4] = TW_ALLOCATION_LENGTH; /* allocation length */

	/* Initialize sglist */
	memset(&sglist, 0, sizeof(TW_SG_Entry_ISO));
	sglist[0].length = TW_SECTOR_SIZE;
	sglist[0].address = tw_dev->generic_buffer_phys[request_id];

	/* Mark internal command */
	tw_dev->srb[request_id] = NULL;

	do {
		/* Send command to the board */
		if (twl_scsiop_execute_scsi(tw_dev, request_id, cdb, 1, sglist)) {
			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x3, "Error posting request sense");
			goto out;
		}

		/* Now poll for completion */
		if (twl_poll_response(tw_dev, request_id, 30)) {
			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x4, "No valid response while draining AEN queue");
			tw_dev->posted_request_count--;
			goto out;
		}

		tw_dev->posted_request_count--;
		header = (TW_Command_Apache_Header *)tw_dev->generic_buffer_virt[request_id];
		aen = le16_to_cpu(header->status_block.error);
		queue = 0;
		count++;

		switch (aen) {
		case TW_AEN_QUEUE_EMPTY:
			if (first_reset != 1)
				goto out;
			else
				finished = 1;
			break;
		case TW_AEN_SOFT_RESET:
			if (first_reset == 0)
				first_reset = 1;
			else
				queue = 1;
			break;
		case TW_AEN_SYNC_TIME_WITH_HOST:
			break;
		default:
			queue = 1;
		}

		/* Now queue an event info */
		if (queue)
			twl_aen_queue_event(tw_dev, header);
	} while ((finished == 0) && (count < TW_MAX_AEN_DRAIN));

	if (count == TW_MAX_AEN_DRAIN)
		goto out;

	retval = 0;
out:
	tw_dev->state[request_id] = TW_S_INITIAL;
	return retval;
} /* End twl_aen_drain_queue() */

/* This function will allocate memory and check if it is correctly aligned */
static int twl_allocate_memory(TW_Device_Extension *tw_dev, int size, int which)
{
	int i;
	dma_addr_t dma_handle;
	unsigned long *cpu_addr;
	int retval = 1;

	cpu_addr = pci_alloc_consistent(tw_dev->tw_pci_dev, size*TW_Q_LENGTH, &dma_handle);
	if (!cpu_addr) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x5, "Memory allocation failed");
		goto out;
	}

	memset(cpu_addr, 0, size*TW_Q_LENGTH);

	for (i = 0; i < TW_Q_LENGTH; i++) {
		switch(which) {
		case 0:
			tw_dev->command_packet_phys[i] = dma_handle+(i*size);
			tw_dev->command_packet_virt[i] = (TW_Command_Full *)((unsigned char *)cpu_addr + (i*size));
			break;
		case 1:
			tw_dev->generic_buffer_phys[i] = dma_handle+(i*size);
			tw_dev->generic_buffer_virt[i] = (unsigned long *)((unsigned char *)cpu_addr + (i*size));
			break;
		case 2:
			tw_dev->sense_buffer_phys[i] = dma_handle+(i*size);
			tw_dev->sense_buffer_virt[i] = (TW_Command_Apache_Header *)((unsigned char *)cpu_addr + (i*size));
			break;
		}
	}
	retval = 0;
out:
	return retval;
} /* End twl_allocate_memory() */

/* This function will load the request id and various sgls for ioctls */
static void twl_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_command_packet, int request_id, dma_addr_t dma_handle, int length)
{
	TW_Command *oldcommand;
	TW_Command_Apache *newcommand;
	TW_SG_Entry_ISO *sgl;
	unsigned int pae = 0;

	if ((sizeof(long) < 8) && (sizeof(dma_addr_t) > 4))
		pae = 1;

	if (TW_OP_OUT(full_command_packet->command.newcommand.opcode__reserved) == TW_OP_EXECUTE_SCSI) {
		newcommand = &full_command_packet->command.newcommand;
		newcommand->request_id__lunl =
			cpu_to_le16(TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->request_id__lunl), request_id));
		if (length) {
			newcommand->sg_list[0].address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1);
			newcommand->sg_list[0].length = TW_CPU_TO_SGL(length);
		}
		newcommand->sgl_entries__lunh =
			cpu_to_le16(TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->sgl_entries__lunh), length ? 1 : 0));
	} else {
		oldcommand = &full_command_packet->command.oldcommand;
		oldcommand->request_id = request_id;

		if (TW_SGL_OUT(oldcommand->opcode__sgloffset)) {
			/* Load the sg list */
			sgl = (TW_SG_Entry_ISO *)((u32 *)oldcommand+oldcommand->size - (sizeof(TW_SG_Entry_ISO)/4) + pae + (sizeof(dma_addr_t) > 4 ? 1 : 0));
			sgl->address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1);
			sgl->length = TW_CPU_TO_SGL(length);
			oldcommand->size += pae;
			oldcommand->size += sizeof(dma_addr_t) > 4 ? 1 : 0;
		}
	}
} /* End twl_load_sgl() */

/* This function handles ioctl for the character device
   This interface is used by smartmontools open source software */
static long twl_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	long timeout;
	unsigned long *cpu_addr, data_buffer_length_adjusted = 0, flags = 0;
	dma_addr_t dma_handle;
	int request_id = 0;
	TW_Ioctl_Driver_Command driver_command;
	struct inode *inode = file->f_dentry->d_inode;
	TW_Ioctl_Buf_Apache *tw_ioctl;
	TW_Command_Full *full_command_packet;
	TW_Device_Extension *tw_dev = twl_device_extension_list[iminor(inode)];
	int retval = -EFAULT;
	void __user *argp = (void __user *)arg;

	mutex_lock(&twl_chrdev_mutex);

	/* Only let one of these through at a time */
	if (mutex_lock_interruptible(&tw_dev->ioctl_lock)) {
		retval = -EINTR;
		goto out;
	}

	/* First copy down the driver command */
	if (copy_from_user(&driver_command, argp, sizeof(TW_Ioctl_Driver_Command)))
		goto out2;

	/* Check data buffer size */
	if (driver_command.buffer_length > TW_MAX_SECTORS * 2048) {
		retval = -EINVAL;
		goto out2;
	}

	/* Hardware can only do multiple of 512 byte transfers */
	data_buffer_length_adjusted = (driver_command.buffer_length + 511) & ~511;

	/* Now allocate ioctl buf memory */
	cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, &dma_handle, GFP_KERNEL);
	if (!cpu_addr) {
		retval = -ENOMEM;
		goto out2;
	}

	tw_ioctl = (TW_Ioctl_Buf_Apache *)cpu_addr;

	/* Now copy down the entire ioctl */
	if (copy_from_user(tw_ioctl, argp, driver_command.buffer_length + sizeof(TW_Ioctl_Buf_Apache) - 1))
		goto out3;

	/* See which ioctl we are doing */
	switch (cmd) {
	case TW_IOCTL_FIRMWARE_PASS_THROUGH:
		spin_lock_irqsave(tw_dev->host->host_lock, flags);
		twl_get_request_id(tw_dev, &request_id);

		/* Flag internal command */
		tw_dev->srb[request_id] = NULL;

		/* Flag chrdev ioctl */
		tw_dev->chrdev_request_id = request_id;

		full_command_packet = (TW_Command_Full *)&tw_ioctl->firmware_command;

		/* Load request id and sglist for both command types */
		twl_load_sgl(tw_dev, full_command_packet, request_id, dma_handle, data_buffer_length_adjusted);

		memcpy(tw_dev->command_packet_virt[request_id], &(tw_ioctl->firmware_command), sizeof(TW_Command_Full));

		/* Now post the command packet to the controller */
		twl_post_command_packet(tw_dev, request_id);
		spin_unlock_irqrestore(tw_dev->host->host_lock, flags);

		timeout = TW_IOCTL_CHRDEV_TIMEOUT*HZ;

		/* Now wait for command to complete */
		timeout = wait_event_timeout(tw_dev->ioctl_wqueue, tw_dev->chrdev_request_id == TW_IOCTL_CHRDEV_FREE, timeout);

		/* We timed out, and didn't get an interrupt */
		if (tw_dev->chrdev_request_id != TW_IOCTL_CHRDEV_FREE) {
			/* Now we need to reset the board */
			printk(KERN_WARNING "3w-sas: scsi%d: WARNING: (0x%02X:0x%04X): Character ioctl (0x%x) timed out, resetting card.\n",
			       tw_dev->host->host_no, TW_DRIVER, 0x6,
			       cmd);
			retval = -EIO;
			twl_reset_device_extension(tw_dev, 1);
			goto out3;
		}

		/* Now copy in the command packet response */
		memcpy(&(tw_ioctl->firmware_command), tw_dev->command_packet_virt[request_id], sizeof(TW_Command_Full));
		
		/* Now complete the io */
		spin_lock_irqsave(tw_dev->host->host_lock, flags);
		tw_dev->posted_request_count--;
		tw_dev->state[request_id] = TW_S_COMPLETED;
		twl_free_request_id(tw_dev, request_id);
		spin_unlock_irqrestore(tw_dev->host->host_lock, flags);
		break;
	default:
		retval = -ENOTTY;
		goto out3;
	}

	/* Now copy the entire response to userspace */
	if (copy_to_user(argp, tw_ioctl, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length - 1) == 0)
		retval = 0;
out3:
	/* Now free ioctl buf memory */
	dma_free_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, cpu_addr, dma_handle);
out2:
	mutex_unlock(&tw_dev->ioctl_lock);
out:
	mutex_unlock(&twl_chrdev_mutex);
	return retval;
} /* End twl_chrdev_ioctl() */

/* This function handles open for the character device */
static int twl_chrdev_open(struct inode *inode, struct file *file)
{
	unsigned int minor_number;
	int retval = -ENODEV;

	if (!capable(CAP_SYS_ADMIN)) {
		retval = -EACCES;
		goto out;
	}

	minor_number = iminor(inode);
	if (minor_number >= twl_device_extension_count)
		goto out;
	retval = 0;
out:
	return retval;
} /* End twl_chrdev_open() */

/* File operations struct for character device */
static const struct file_operations twl_fops = {
	.owner		= THIS_MODULE,
	.unlocked_ioctl	= twl_chrdev_ioctl,
	.open		= twl_chrdev_open,
	.release	= NULL,
	.llseek		= noop_llseek,
};

/* This function passes sense data from firmware to scsi layer */
static int twl_fill_sense(TW_Device_Extension *tw_dev, int i, int request_id, int copy_sense, int print_host)
{
	TW_Command_Apache_Header *header;
	TW_Command_Full *full_command_packet;
	unsigned short error;
	char *error_str;
	int retval = 1;

	header = tw_dev->sense_buffer_virt[i];
	full_command_packet = tw_dev->command_packet_virt[request_id];

	/* Get embedded firmware error string */
	error_str = &(header->err_specific_desc[strlen(header->err_specific_desc) + 1]);

	/* Don't print error for Logical unit not supported during rollcall */
	error = le16_to_cpu(header->status_block.error);
	if ((error != TW_ERROR_LOGICAL_UNIT_NOT_SUPPORTED) && (error != TW_ERROR_UNIT_OFFLINE) && (error != TW_ERROR_INVALID_FIELD_IN_CDB)) {
		if (print_host)
			printk(KERN_WARNING "3w-sas: scsi%d: ERROR: (0x%02X:0x%04X): %s:%s.\n",
			       tw_dev->host->host_no,
			       TW_MESSAGE_SOURCE_CONTROLLER_ERROR,
			       header->status_block.error,
			       error_str, 
			       header->err_specific_desc);
		else
			printk(KERN_WARNING "3w-sas: ERROR: (0x%02X:0x%04X): %s:%s.\n",
			       TW_MESSAGE_SOURCE_CONTROLLER_ERROR,
			       header->status_block.error,
			       error_str,
			       header->err_specific_desc);
	}

	if (copy_sense) {
		memcpy(tw_dev->srb[request_id]->sense_buffer, header->sense_data, TW_SENSE_DATA_LENGTH);
		tw_dev->srb[request_id]->result = (full_command_packet->command.newcommand.status << 1);
		goto out;
	}
out:
	return retval;
} /* End twl_fill_sense() */

/* This function will free up device extension resources */
static void twl_free_device_extension(TW_Device_Extension *tw_dev)
{
	if (tw_dev->command_packet_virt[0])
		pci_free_consistent(tw_dev->tw_pci_dev,
				    sizeof(TW_Command_Full)*TW_Q_LENGTH,
				    tw_dev->command_packet_virt[0],
				    tw_dev->command_packet_phys[0]);

	if (tw_dev->generic_buffer_virt[0])
		pci_free_consistent(tw_dev->tw_pci_dev,
				    TW_SECTOR_SIZE*TW_Q_LENGTH,
				    tw_dev->generic_buffer_virt[0],
				    tw_dev->generic_buffer_phys[0]);

	if (tw_dev->sense_buffer_virt[0])
		pci_free_consistent(tw_dev->tw_pci_dev,
				    sizeof(TW_Command_Apache_Header)*
				    TW_Q_LENGTH,
				    tw_dev->sense_buffer_virt[0],
				    tw_dev->sense_buffer_phys[0]);

	kfree(tw_dev->event_queue[0]);
} /* End twl_free_device_extension() */

/* This function will get parameter table entries from the firmware */
static void *twl_get_param(TW_Device_Extension *tw_dev, int request_id, int table_id, int parameter_id, int parameter_size_bytes)
{
	TW_Command_Full *full_command_packet;
	TW_Command *command_packet;
	TW_Param_Apache *param;
	void *retval = NULL;

	/* Setup the command packet */
	full_command_packet = tw_dev->command_packet_virt[request_id];
	memset(full_command_packet, 0, sizeof(TW_Command_Full));
	command_packet = &full_command_packet->command.oldcommand;

	command_packet->opcode__sgloffset = TW_OPSGL_IN(2, TW_OP_GET_PARAM);
	command_packet->size              = TW_COMMAND_SIZE;
	command_packet->request_id        = request_id;
	command_packet->byte6_offset.block_count = cpu_to_le16(1);

	/* Now setup the param */
	param = (TW_Param_Apache *)tw_dev->generic_buffer_virt[request_id];
	memset(param, 0, TW_SECTOR_SIZE);
	param->table_id = cpu_to_le16(table_id | 0x8000);
	param->parameter_id = cpu_to_le16(parameter_id);
	param->parameter_size_bytes = cpu_to_le16(parameter_size_bytes);

	command_packet->byte8_offset.param.sgl[0].address = TW_CPU_TO_SGL(tw_dev->generic_buffer_phys[request_id]);
	command_packet->byte8_offset.param.sgl[0].length = TW_CPU_TO_SGL(TW_SECTOR_SIZE);

	/* Post the command packet to the board */
	twl_post_command_packet(tw_dev, request_id);

	/* Poll for completion */
	if (twl_poll_response(tw_dev, request_id, 30))
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x7, "No valid response during get param")
	else
		retval = (void *)&(param->data[0]);

	tw_dev->posted_request_count--;
	tw_dev->state[request_id] = TW_S_INITIAL;

	return retval;
} /* End twl_get_param() */

/* This function will send an initconnection command to controller */
static int twl_initconnection(TW_Device_Extension *tw_dev, int message_credits,
 			      u32 set_features, unsigned short current_fw_srl, 
			      unsigned short current_fw_arch_id, 
			      unsigned short current_fw_branch, 
			      unsigned short current_fw_build, 
			      unsigned short *fw_on_ctlr_srl, 
			      unsigned short *fw_on_ctlr_arch_id, 
			      unsigned short *fw_on_ctlr_branch, 
			      unsigned short *fw_on_ctlr_build, 
			      u32 *init_connect_result)
{
	TW_Command_Full *full_command_packet;
	TW_Initconnect *tw_initconnect;
	int request_id = 0, retval = 1;

	/* Initialize InitConnection command packet */
	full_command_packet = tw_dev->command_packet_virt[request_id];
	memset(full_command_packet, 0, sizeof(TW_Command_Full));
	full_command_packet->header.header_desc.size_header = 128;
	
	tw_initconnect = (TW_Initconnect *)&full_command_packet->command.oldcommand;
	tw_initconnect->opcode__reserved = TW_OPRES_IN(0, TW_OP_INIT_CONNECTION);
	tw_initconnect->request_id = request_id;
	tw_initconnect->message_credits = cpu_to_le16(message_credits);
	tw_initconnect->features = set_features;

	/* Turn on 64-bit sgl support if we need to */
	tw_initconnect->features |= sizeof(dma_addr_t) > 4 ? 1 : 0;

	tw_initconnect->features = cpu_to_le32(tw_initconnect->features);

	if (set_features & TW_EXTENDED_INIT_CONNECT) {
		tw_initconnect->size = TW_INIT_COMMAND_PACKET_SIZE_EXTENDED;
		tw_initconnect->fw_srl = cpu_to_le16(current_fw_srl);
		tw_initconnect->fw_arch_id = cpu_to_le16(current_fw_arch_id);
		tw_initconnect->fw_branch = cpu_to_le16(current_fw_branch);
		tw_initconnect->fw_build = cpu_to_le16(current_fw_build);
	} else 
		tw_initconnect->size = TW_INIT_COMMAND_PACKET_SIZE;

	/* Send command packet to the board */
	twl_post_command_packet(tw_dev, request_id);

	/* Poll for completion */
	if (twl_poll_response(tw_dev, request_id, 30)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x8, "No valid response during init connection");
	} else {
		if (set_features & TW_EXTENDED_INIT_CONNECT) {
			*fw_on_ctlr_srl = le16_to_cpu(tw_initconnect->fw_srl);
			*fw_on_ctlr_arch_id = le16_to_cpu(tw_initconnect->fw_arch_id);
			*fw_on_ctlr_branch = le16_to_cpu(tw_initconnect->fw_branch);
			*fw_on_ctlr_build = le16_to_cpu(tw_initconnect->fw_build);
			*init_connect_result = le32_to_cpu(tw_initconnect->result);
		}
		retval = 0;
	}

	tw_dev->posted_request_count--;
	tw_dev->state[request_id] = TW_S_INITIAL;

	return retval;
} /* End twl_initconnection() */

/* This function will initialize the fields of a device extension */
static int twl_initialize_device_extension(TW_Device_Extension *tw_dev)
{
	int i, retval = 1;

	/* Initialize command packet buffers */
	if (twl_allocate_memory(tw_dev, sizeof(TW_Command_Full), 0)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x9, "Command packet memory allocation failed");
		goto out;
	}

	/* Initialize generic buffer */
	if (twl_allocate_memory(tw_dev, TW_SECTOR_SIZE, 1)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0xa, "Generic memory allocation failed");
		goto out;
	}

	/* Allocate sense buffers */
	if (twl_allocate_memory(tw_dev, sizeof(TW_Command_Apache_Header), 2)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0xb, "Sense buffer allocation failed");
		goto out;
	}

	/* Allocate event info space */
	tw_dev->event_queue[0] = kcalloc(TW_Q_LENGTH, sizeof(TW_Event), GFP_KERNEL);
	if (!tw_dev->event_queue[0]) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0xc, "Event info memory allocation failed");
		goto out;
	}

	for (i = 0; i < TW_Q_LENGTH; i++) {
		tw_dev->event_queue[i] = (TW_Event *)((unsigned char *)tw_dev->event_queue[0] + (i * sizeof(TW_Event)));
		tw_dev->free_queue[i] = i;
		tw_dev->state[i] = TW_S_INITIAL;
	}

	tw_dev->free_head = TW_Q_START;
	tw_dev->free_tail = TW_Q_START;
	tw_dev->error_sequence_id = 1;
	tw_dev->chrdev_request_id = TW_IOCTL_CHRDEV_FREE;

	mutex_init(&tw_dev->ioctl_lock);
	init_waitqueue_head(&tw_dev->ioctl_wqueue);

	retval = 0;
out:
	return retval;
} /* End twl_initialize_device_extension() */

/* This function will perform a pci-dma unmap */
static void twl_unmap_scsi_data(TW_Device_Extension *tw_dev, int request_id)
{
	struct scsi_cmnd *cmd = tw_dev->srb[request_id];

	if (cmd->SCp.phase == TW_PHASE_SGLIST)
		scsi_dma_unmap(cmd);
} /* End twl_unmap_scsi_data() */

/* This function will handle attention interrupts */
static int twl_handle_attention_interrupt(TW_Device_Extension *tw_dev)
{
	int retval = 1;
	u32 request_id, doorbell;

	/* Read doorbell status */
	doorbell = readl(TWL_HOBDB_REG_ADDR(tw_dev));

	/* Check for controller errors */
	if (doorbell & TWL_DOORBELL_CONTROLLER_ERROR) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0xd, "Microcontroller Error: clearing");
		goto out;
	}

	/* Check if we need to perform an AEN drain */
	if (doorbell & TWL_DOORBELL_ATTENTION_INTERRUPT) {
		if (!(test_and_set_bit(TW_IN_ATTENTION_LOOP, &tw_dev->flags))) {
			twl_get_request_id(tw_dev, &request_id);
			if (twl_aen_read_queue(tw_dev, request_id)) {
				tw_dev->state[request_id] = TW_S_COMPLETED;
				twl_free_request_id(tw_dev, request_id);
				clear_bit(TW_IN_ATTENTION_LOOP, &tw_dev->flags);
			}
		}
	}

	retval = 0;
out:
	/* Clear doorbell interrupt */
	TWL_CLEAR_DB_INTERRUPT(tw_dev);

	/* Make sure the clear was flushed by reading it back */
	readl(TWL_HOBDBC_REG_ADDR(tw_dev));

	return retval;
} /* End twl_handle_attention_interrupt() */

/* Interrupt service routine */
static irqreturn_t twl_interrupt(int irq, void *dev_instance)
{
	TW_Device_Extension *tw_dev = (TW_Device_Extension *)dev_instance;
	int i, handled = 0, error = 0;
	dma_addr_t mfa = 0;
	u32 reg, regl, regh, response, request_id = 0;
	struct scsi_cmnd *cmd;
	TW_Command_Full *full_command_packet;

	spin_lock(tw_dev->host->host_lock);

	/* Read host interrupt status */
	reg = readl(TWL_HISTAT_REG_ADDR(tw_dev));

	/* Check if this is our interrupt, otherwise bail */
	if (!(reg & TWL_HISTATUS_VALID_INTERRUPT))
		goto twl_interrupt_bail;

	handled = 1;

	/* If we are resetting, bail */
	if (test_bit(TW_IN_RESET, &tw_dev->flags))
		goto twl_interrupt_bail;

	/* Attention interrupt */
	if (reg & TWL_HISTATUS_ATTENTION_INTERRUPT) {
		if (twl_handle_attention_interrupt(tw_dev)) {
			TWL_MASK_INTERRUPTS(tw_dev);
			goto twl_interrupt_bail;
		}
	}

	/* Response interrupt */
	while (reg & TWL_HISTATUS_RESPONSE_INTERRUPT) {
		if (sizeof(dma_addr_t) > 4) {
			regh = readl(TWL_HOBQPH_REG_ADDR(tw_dev));
			regl = readl(TWL_HOBQPL_REG_ADDR(tw_dev));
			mfa = ((u64)regh << 32) | regl;
		} else
			mfa = readl(TWL_HOBQPL_REG_ADDR(tw_dev));

		error = 0;
		response = (u32)mfa;

		/* Check for command packet error */
		if (!TW_NOTMFA_OUT(response)) {
			for (i=0;i<TW_Q_LENGTH;i++) {
				if (tw_dev->sense_buffer_phys[i] == mfa) {
					request_id = le16_to_cpu(tw_dev->sense_buffer_virt[i]->header_desc.request_id);
					if (tw_dev->srb[request_id] != NULL)
						error = twl_fill_sense(tw_dev, i, request_id, 1, 1);
					else {
						/* Skip ioctl error prints */
						if (request_id != tw_dev->chrdev_request_id)
							error = twl_fill_sense(tw_dev, i, request_id, 0, 1);
						else
							memcpy(tw_dev->command_packet_virt[request_id], tw_dev->sense_buffer_virt[i], sizeof(TW_Command_Apache_Header));
					}

					/* Now re-post the sense buffer */
					writel((u32)((u64)tw_dev->sense_buffer_phys[i] >> 32), TWL_HOBQPH_REG_ADDR(tw_dev));
					writel((u32)tw_dev->sense_buffer_phys[i], TWL_HOBQPL_REG_ADDR(tw_dev));
					break;
				}
			}
		} else
			request_id = TW_RESID_OUT(response);

		full_command_packet = tw_dev->command_packet_virt[request_id];

		/* Check for correct state */
		if (tw_dev->state[request_id] != TW_S_POSTED) {
			if (tw_dev->srb[request_id] != NULL) {
				TW_PRINTK(tw_dev->host, TW_DRIVER, 0xe, "Received a request id that wasn't posted");
				TWL_MASK_INTERRUPTS(tw_dev);
				goto twl_interrupt_bail;
			}
		}

		/* Check for internal command completion */
		if (tw_dev->srb[request_id] == NULL) {
			if (request_id != tw_dev->chrdev_request_id) {
				if (twl_aen_complete(tw_dev, request_id))
					TW_PRINTK(tw_dev->host, TW_DRIVER, 0xf, "Error completing AEN during attention interrupt");
			} else {
				tw_dev->chrdev_request_id = TW_IOCTL_CHRDEV_FREE;
				wake_up(&tw_dev->ioctl_wqueue);
			}
		} else {
			cmd = tw_dev->srb[request_id];

			if (!error)
				cmd->result = (DID_OK << 16);
			
			/* Report residual bytes for single sgl */
			if ((scsi_sg_count(cmd) <= 1) && (full_command_packet->command.newcommand.status == 0)) {
				if (full_command_packet->command.newcommand.sg_list[0].length < scsi_bufflen(tw_dev->srb[request_id]))
					scsi_set_resid(cmd, scsi_bufflen(cmd) - full_command_packet->command.newcommand.sg_list[0].length);
			}

			/* Now complete the io */
			tw_dev->state[request_id] = TW_S_COMPLETED;
			twl_free_request_id(tw_dev, request_id);
			tw_dev->posted_request_count--;
			tw_dev->srb[request_id]->scsi_done(tw_dev->srb[request_id]);
			twl_unmap_scsi_data(tw_dev, request_id);
		}

		/* Check for another response interrupt */
		reg = readl(TWL_HISTAT_REG_ADDR(tw_dev));
	}

twl_interrupt_bail:
	spin_unlock(tw_dev->host->host_lock);
	return IRQ_RETVAL(handled);
} /* End twl_interrupt() */

/* This function will poll for a register change */
static int twl_poll_register(TW_Device_Extension *tw_dev, void *reg, u32 value, u32 result, int seconds)
{
	unsigned long before;
	int retval = 1;
	u32 reg_value;

	reg_value = readl(reg);
	before = jiffies;

        while ((reg_value & value) != result) {
		reg_value = readl(reg);
		if (time_after(jiffies, before + HZ * seconds))
			goto out;
		msleep(50);
	}
	retval = 0;
out:
	return retval;
} /* End twl_poll_register() */

/* This function will reset a controller */
static int twl_reset_sequence(TW_Device_Extension *tw_dev, int soft_reset)
{
	int retval = 1;
	int i = 0;
	u32 status = 0;
	unsigned short fw_on_ctlr_srl = 0, fw_on_ctlr_arch_id = 0;
	unsigned short fw_on_ctlr_branch = 0, fw_on_ctlr_build = 0;
	u32 init_connect_result = 0;
	int tries = 0;
	int do_soft_reset = soft_reset;

	while (tries < TW_MAX_RESET_TRIES) {
		/* Do a soft reset if one is needed */
		if (do_soft_reset) {
			TWL_SOFT_RESET(tw_dev);

			/* Make sure controller is in a good state */
			if (twl_poll_register(tw_dev, TWL_SCRPD3_REG_ADDR(tw_dev), TWL_CONTROLLER_READY, 0x0, 30)) {
				TW_PRINTK(tw_dev->host, TW_DRIVER, 0x10, "Controller never went non-ready during reset sequence");
				tries++;
				continue;
			}
			if (twl_poll_register(tw_dev, TWL_SCRPD3_REG_ADDR(tw_dev), TWL_CONTROLLER_READY, TWL_CONTROLLER_READY, 60)) {
				TW_PRINTK(tw_dev->host, TW_DRIVER, 0x11, "Controller not ready during reset sequence");
				tries++;
				continue;
			}
		}

		/* Initconnect */
		if (twl_initconnection(tw_dev, TW_INIT_MESSAGE_CREDITS,
				       TW_EXTENDED_INIT_CONNECT, TW_CURRENT_DRIVER_SRL,
				       TW_9750_ARCH_ID, TW_CURRENT_DRIVER_BRANCH,
				       TW_CURRENT_DRIVER_BUILD, &fw_on_ctlr_srl,
				       &fw_on_ctlr_arch_id, &fw_on_ctlr_branch,
				       &fw_on_ctlr_build, &init_connect_result)) {
			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x12, "Initconnection failed while checking SRL");
			do_soft_reset = 1;
			tries++;
			continue;
		}

		/* Load sense buffers */
		while (i < TW_Q_LENGTH) {
			writel((u32)((u64)tw_dev->sense_buffer_phys[i] >> 32), TWL_HOBQPH_REG_ADDR(tw_dev));
			writel((u32)tw_dev->sense_buffer_phys[i], TWL_HOBQPL_REG_ADDR(tw_dev));

			/* Check status for over-run after each write */
			status = readl(TWL_STATUS_REG_ADDR(tw_dev));
			if (!(status & TWL_STATUS_OVERRUN_SUBMIT))
			    i++;
		}

		/* Now check status */
		status = readl(TWL_STATUS_REG_ADDR(tw_dev));
		if (status) {
			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x13, "Bad controller status after loading sense buffers");
			do_soft_reset = 1;
			tries++;
			continue;
		}

		/* Drain the AEN queue */
		if (twl_aen_drain_queue(tw_dev, soft_reset)) {
			TW_PRINTK(tw_dev->host, TW_DRIVER, 0x14, "AEN drain failed during reset sequence");
			do_soft_reset = 1;
			tries++;
			continue;
		}

		/* Load rest of compatibility struct */
		strncpy(tw_dev->tw_compat_info.driver_version, TW_DRIVER_VERSION, strlen(TW_DRIVER_VERSION));
		tw_dev->tw_compat_info.driver_srl_high = TW_CURRENT_DRIVER_SRL;
		tw_dev->tw_compat_info.driver_branch_high = TW_CURRENT_DRIVER_BRANCH;
		tw_dev->tw_compat_info.driver_build_high = TW_CURRENT_DRIVER_BUILD;
		tw_dev->tw_compat_info.driver_srl_low = TW_BASE_FW_SRL;
		tw_dev->tw_compat_info.driver_branch_low = TW_BASE_FW_BRANCH;
		tw_dev->tw_compat_info.driver_build_low = TW_BASE_FW_BUILD;
		tw_dev->tw_compat_info.fw_on_ctlr_srl = fw_on_ctlr_srl;
		tw_dev->tw_compat_info.fw_on_ctlr_branch = fw_on_ctlr_branch;
		tw_dev->tw_compat_info.fw_on_ctlr_build = fw_on_ctlr_build;

		/* If we got here, controller is in a good state */
		retval = 0;
		goto out;
	}
out:
	return retval;
} /* End twl_reset_sequence() */

/* This function will reset a device extension */
static int twl_reset_device_extension(TW_Device_Extension *tw_dev, int ioctl_reset)
{
	int i = 0, retval = 1;
	unsigned long flags = 0;

	/* Block SCSI requests while we are resetting */
	if (ioctl_reset)
		scsi_block_requests(tw_dev->host);

	set_bit(TW_IN_RESET, &tw_dev->flags);
	TWL_MASK_INTERRUPTS(tw_dev);
	TWL_CLEAR_DB_INTERRUPT(tw_dev);

	spin_lock_irqsave(tw_dev->host->host_lock, flags);

	/* Abort all requests that are in progress */
	for (i = 0; i < TW_Q_LENGTH; i++) {
		if ((tw_dev->state[i] != TW_S_FINISHED) &&
		    (tw_dev->state[i] != TW_S_INITIAL) &&
		    (tw_dev->state[i] != TW_S_COMPLETED)) {
			if (tw_dev->srb[i]) {
				tw_dev->srb[i]->result = (DID_RESET << 16);
				tw_dev->srb[i]->scsi_done(tw_dev->srb[i]);
				twl_unmap_scsi_data(tw_dev, i);
			}
		}
	}

	/* Reset queues and counts */
	for (i = 0; i < TW_Q_LENGTH; i++) {
		tw_dev->free_queue[i] = i;
		tw_dev->state[i] = TW_S_INITIAL;
	}
	tw_dev->free_head = TW_Q_START;
	tw_dev->free_tail = TW_Q_START;
	tw_dev->posted_request_count = 0;

	spin_unlock_irqrestore(tw_dev->host->host_lock, flags);

	if (twl_reset_sequence(tw_dev, 1))
		goto out;

	TWL_UNMASK_INTERRUPTS(tw_dev);

	clear_bit(TW_IN_RESET, &tw_dev->flags);
	tw_dev->chrdev_request_id = TW_IOCTL_CHRDEV_FREE;

	retval = 0;
out:
	if (ioctl_reset)
		scsi_unblock_requests(tw_dev->host);
	return retval;
} /* End twl_reset_device_extension() */

/* This funciton returns unit geometry in cylinders/heads/sectors */
static int twl_scsi_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int geom[])
{
	int heads, sectors;
	TW_Device_Extension *tw_dev;

	tw_dev = (TW_Device_Extension *)sdev->host->hostdata;

	if (capacity >= 0x200000) {
		heads = 255;
		sectors = 63;
	} else {
		heads = 64;
		sectors = 32;
	}

	geom[0] = heads;
	geom[1] = sectors;
	geom[2] = sector_div(capacity, heads * sectors); /* cylinders */

	return 0;
} /* End twl_scsi_biosparam() */

/* This is the new scsi eh reset function */
static int twl_scsi_eh_reset(struct scsi_cmnd *SCpnt)
{
	TW_Device_Extension *tw_dev = NULL;
	int retval = FAILED;

	tw_dev = (TW_Device_Extension *)SCpnt->device->host->hostdata;

	tw_dev->num_resets++;

	sdev_printk(KERN_WARNING, SCpnt->device,
		"WARNING: (0x%02X:0x%04X): Command (0x%x) timed out, resetting card.\n",
		TW_DRIVER, 0x2c, SCpnt->cmnd[0]);

	/* Make sure we are not issuing an ioctl or resetting from ioctl */
	mutex_lock(&tw_dev->ioctl_lock);

	/* Now reset the card and some of the device extension data */
	if (twl_reset_device_extension(tw_dev, 0)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x15, "Controller reset failed during scsi host reset");
		goto out;
	}

	retval = SUCCESS;
out:
	mutex_unlock(&tw_dev->ioctl_lock);
	return retval;
} /* End twl_scsi_eh_reset() */

/* This is the main scsi queue function to handle scsi opcodes */
static int twl_scsi_queue(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *))
{
	int request_id, retval;
	TW_Device_Extension *tw_dev = (TW_Device_Extension *)SCpnt->device->host->hostdata;

	/* If we are resetting due to timed out ioctl, report as busy */
	if (test_bit(TW_IN_RESET, &tw_dev->flags)) {
		retval = SCSI_MLQUEUE_HOST_BUSY;
		goto out;
	}

	/* Save done function into scsi_cmnd struct */
	SCpnt->scsi_done = done;
		
	/* Get a free request id */
	twl_get_request_id(tw_dev, &request_id);

	/* Save the scsi command for use by the ISR */
	tw_dev->srb[request_id] = SCpnt;

	/* Initialize phase to zero */
	SCpnt->SCp.phase = TW_PHASE_INITIAL;

	retval = twl_scsiop_execute_scsi(tw_dev, request_id, NULL, 0, NULL);
	if (retval) {
		tw_dev->state[request_id] = TW_S_COMPLETED;
		twl_free_request_id(tw_dev, request_id);
		SCpnt->result = (DID_ERROR << 16);
		done(SCpnt);
		retval = 0;
	}
out:
	return retval;
} /* End twl_scsi_queue() */

/* This function tells the controller to shut down */
static void __twl_shutdown(TW_Device_Extension *tw_dev)
{
	/* Disable interrupts */
	TWL_MASK_INTERRUPTS(tw_dev);

	/* Free up the IRQ */
	free_irq(tw_dev->tw_pci_dev->irq, tw_dev);

	printk(KERN_WARNING "3w-sas: Shutting down host %d.\n", tw_dev->host->host_no);

	/* Tell the card we are shutting down */
	if (twl_initconnection(tw_dev, 1, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x16, "Connection shutdown failed");
	} else {
		printk(KERN_WARNING "3w-sas: Shutdown complete.\n");
	}

	/* Clear doorbell interrupt just before exit */
	TWL_CLEAR_DB_INTERRUPT(tw_dev);
} /* End __twl_shutdown() */

/* Wrapper for __twl_shutdown */
static void twl_shutdown(struct pci_dev *pdev)
{
	struct Scsi_Host *host = pci_get_drvdata(pdev);
	TW_Device_Extension *tw_dev;

	if (!host)
		return;

	tw_dev = (TW_Device_Extension *)host->hostdata;

	if (tw_dev->online) 
		__twl_shutdown(tw_dev);
} /* End twl_shutdown() */

/* This function configures unit settings when a unit is coming on-line */
static int twl_slave_configure(struct scsi_device *sdev)
{
	/* Force 60 second timeout */
	blk_queue_rq_timeout(sdev->request_queue, 60 * HZ);

	return 0;
} /* End twl_slave_configure() */

/* scsi_host_template initializer */
static struct scsi_host_template driver_template = {
	.module			= THIS_MODULE,
	.name			= "3w-sas",
	.queuecommand		= twl_scsi_queue,
	.eh_host_reset_handler	= twl_scsi_eh_reset,
	.bios_param		= twl_scsi_biosparam,
	.change_queue_depth	= twl_change_queue_depth,
	.can_queue		= TW_Q_LENGTH-2,
	.slave_configure	= twl_slave_configure,
	.this_id		= -1,
	.sg_tablesize		= TW_LIBERATOR_MAX_SGL_LENGTH,
	.max_sectors		= TW_MAX_SECTORS,
	.cmd_per_lun		= TW_MAX_CMDS_PER_LUN,
	.use_clustering		= ENABLE_CLUSTERING,
	.shost_attrs		= twl_host_attrs,
	.emulated		= 1
};

/* This function will probe and initialize a card */
static int __devinit twl_probe(struct pci_dev *pdev, const struct pci_device_id *dev_id)
{
	struct Scsi_Host *host = NULL;
	TW_Device_Extension *tw_dev;
	int retval = -ENODEV;
	int *ptr_phycount, phycount=0;

	retval = pci_enable_device(pdev);
	if (retval) {
		TW_PRINTK(host, TW_DRIVER, 0x17, "Failed to enable pci device");
		goto out_disable_device;
	}

	pci_set_master(pdev);
	pci_try_set_mwi(pdev);

	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
	    || pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))
		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))
		    || pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32))) {
			TW_PRINTK(host, TW_DRIVER, 0x18, "Failed to set dma mask");
			retval = -ENODEV;
			goto out_disable_device;
		}

	host = scsi_host_alloc(&driver_template, sizeof(TW_Device_Extension));
	if (!host) {
		TW_PRINTK(host, TW_DRIVER, 0x19, "Failed to allocate memory for device extension");
		retval = -ENOMEM;
		goto out_disable_device;
	}
	tw_dev = shost_priv(host);

	/* Save values to device extension */
	tw_dev->host = host;
	tw_dev->tw_pci_dev = pdev;

	if (twl_initialize_device_extension(tw_dev)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1a, "Failed to initialize device extension");
		goto out_free_device_extension;
	}

	/* Request IO regions */
	retval = pci_request_regions(pdev, "3w-sas");
	if (retval) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1b, "Failed to get mem region");
		goto out_free_device_extension;
	}

	/* Save base address, use region 1 */
	tw_dev->base_addr = pci_iomap(pdev, 1, 0);
	if (!tw_dev->base_addr) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1c, "Failed to ioremap");
		goto out_release_mem_region;
	}

	/* Disable interrupts on the card */
	TWL_MASK_INTERRUPTS(tw_dev);

	/* Initialize the card */
	if (twl_reset_sequence(tw_dev, 0)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1d, "Controller reset failed during probe");
		goto out_iounmap;
	}

	/* Set host specific parameters */
	host->max_id = TW_MAX_UNITS;
	host->max_cmd_len = TW_MAX_CDB_LEN;
	host->max_lun = TW_MAX_LUNS;
	host->max_channel = 0;

	/* Register the card with the kernel SCSI layer */
	retval = scsi_add_host(host, &pdev->dev);
	if (retval) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1e, "scsi add host failed");
		goto out_iounmap;
	}

	pci_set_drvdata(pdev, host);

	printk(KERN_WARNING "3w-sas: scsi%d: Found an LSI 3ware %s Controller at 0x%llx, IRQ: %d.\n",
	       host->host_no,
	       (char *)twl_get_param(tw_dev, 1, TW_VERSION_TABLE,
				     TW_PARAM_MODEL, TW_PARAM_MODEL_LENGTH),
	       (u64)pci_resource_start(pdev, 1), pdev->irq);

	ptr_phycount = twl_get_param(tw_dev, 2, TW_PARAM_PHY_SUMMARY_TABLE,
				     TW_PARAM_PHYCOUNT, TW_PARAM_PHYCOUNT_LENGTH);
	if (ptr_phycount)
		phycount = le32_to_cpu(*(int *)ptr_phycount);

	printk(KERN_WARNING "3w-sas: scsi%d: Firmware %s, BIOS %s, Phys: %d.\n",
	       host->host_no,
	       (char *)twl_get_param(tw_dev, 1, TW_VERSION_TABLE,
				     TW_PARAM_FWVER, TW_PARAM_FWVER_LENGTH),
	       (char *)twl_get_param(tw_dev, 2, TW_VERSION_TABLE,
				     TW_PARAM_BIOSVER, TW_PARAM_BIOSVER_LENGTH),
	       phycount);

	/* Try to enable MSI */
	if (use_msi && !pci_enable_msi(pdev))
		set_bit(TW_USING_MSI, &tw_dev->flags);

	/* Now setup the interrupt handler */
	retval = request_irq(pdev->irq, twl_interrupt, IRQF_SHARED, "3w-sas", tw_dev);
	if (retval) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x1f, "Error requesting IRQ");
		goto out_remove_host;
	}

	twl_device_extension_list[twl_device_extension_count] = tw_dev;
	twl_device_extension_count++;

	/* Re-enable interrupts on the card */
	TWL_UNMASK_INTERRUPTS(tw_dev);
	
	/* Finally, scan the host */
	scsi_scan_host(host);

	/* Add sysfs binary files */
	if (sysfs_create_bin_file(&host->shost_dev.kobj, &twl_sysfs_aen_read_attr))
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x20, "Failed to create sysfs binary file: 3ware_aen_read");
	if (sysfs_create_bin_file(&host->shost_dev.kobj, &twl_sysfs_compat_info_attr))
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x21, "Failed to create sysfs binary file: 3ware_compat_info");

	if (twl_major == -1) {
		if ((twl_major = register_chrdev (0, "twl", &twl_fops)) < 0)
			TW_PRINTK(host, TW_DRIVER, 0x22, "Failed to register character device");
	}
	tw_dev->online = 1;
	return 0;

out_remove_host:
	if (test_bit(TW_USING_MSI, &tw_dev->flags))
		pci_disable_msi(pdev);
	scsi_remove_host(host);
out_iounmap:
	iounmap(tw_dev->base_addr);
out_release_mem_region:
	pci_release_regions(pdev);
out_free_device_extension:
	twl_free_device_extension(tw_dev);
	scsi_host_put(host);
out_disable_device:
	pci_disable_device(pdev);

	return retval;
} /* End twl_probe() */

/* This function is called to remove a device */
static void twl_remove(struct pci_dev *pdev)
{
	struct Scsi_Host *host = pci_get_drvdata(pdev);
	TW_Device_Extension *tw_dev;

	if (!host)
		return;

	tw_dev = (TW_Device_Extension *)host->hostdata;

	if (!tw_dev->online)
		return;

	/* Remove sysfs binary files */
	sysfs_remove_bin_file(&host->shost_dev.kobj, &twl_sysfs_aen_read_attr);
	sysfs_remove_bin_file(&host->shost_dev.kobj, &twl_sysfs_compat_info_attr);

	scsi_remove_host(tw_dev->host);

	/* Unregister character device */
	if (twl_major >= 0) {
		unregister_chrdev(twl_major, "twl");
		twl_major = -1;
	}

	/* Shutdown the card */
	__twl_shutdown(tw_dev);

	/* Disable MSI if enabled */
	if (test_bit(TW_USING_MSI, &tw_dev->flags))
		pci_disable_msi(pdev);

	/* Free IO remapping */
	iounmap(tw_dev->base_addr);

	/* Free up the mem region */
	pci_release_regions(pdev);

	/* Free up device extension resources */
	twl_free_device_extension(tw_dev);

	scsi_host_put(tw_dev->host);
	pci_disable_device(pdev);
	twl_device_extension_count--;
} /* End twl_remove() */

#ifdef CONFIG_PM
/* This function is called on PCI suspend */
static int twl_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct Scsi_Host *host = pci_get_drvdata(pdev);
	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;

	printk(KERN_WARNING "3w-sas: Suspending host %d.\n", tw_dev->host->host_no);
	/* Disable interrupts */
	TWL_MASK_INTERRUPTS(tw_dev);

	free_irq(tw_dev->tw_pci_dev->irq, tw_dev);

	/* Tell the card we are shutting down */
	if (twl_initconnection(tw_dev, 1, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL)) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x23, "Connection shutdown failed during suspend");
	} else {
		printk(KERN_WARNING "3w-sas: Suspend complete.\n");
	}

	/* Clear doorbell interrupt */
	TWL_CLEAR_DB_INTERRUPT(tw_dev);

	pci_save_state(pdev);
	pci_disable_device(pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, state));

	return 0;
} /* End twl_suspend() */

/* This function is called on PCI resume */
static int twl_resume(struct pci_dev *pdev)
{
	int retval = 0;
	struct Scsi_Host *host = pci_get_drvdata(pdev);
	TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;

	printk(KERN_WARNING "3w-sas: Resuming host %d.\n", tw_dev->host->host_no);
	pci_set_power_state(pdev, PCI_D0);
	pci_enable_wake(pdev, PCI_D0, 0);
	pci_restore_state(pdev);

	retval = pci_enable_device(pdev);
	if (retval) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x24, "Enable device failed during resume");
		return retval;
	}

	pci_set_master(pdev);
	pci_try_set_mwi(pdev);

	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
	    || pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))
		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))
		    || pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32))) {
			TW_PRINTK(host, TW_DRIVER, 0x25, "Failed to set dma mask during resume");
			retval = -ENODEV;
			goto out_disable_device;
		}

	/* Initialize the card */
	if (twl_reset_sequence(tw_dev, 0)) {
		retval = -ENODEV;
		goto out_disable_device;
	}

	/* Now setup the interrupt handler */
	retval = request_irq(pdev->irq, twl_interrupt, IRQF_SHARED, "3w-sas", tw_dev);
	if (retval) {
		TW_PRINTK(tw_dev->host, TW_DRIVER, 0x26, "Error requesting IRQ during resume");
		retval = -ENODEV;
		goto out_disable_device;
	}

	/* Now enable MSI if enabled */
	if (test_bit(TW_USING_MSI, &tw_dev->flags))
		pci_enable_msi(pdev);

	/* Re-enable interrupts on the card */
	TWL_UNMASK_INTERRUPTS(tw_dev);

	printk(KERN_WARNING "3w-sas: Resume complete.\n");
	return 0;

out_disable_device:
	scsi_remove_host(host);
	pci_disable_device(pdev);

	return retval;
} /* End twl_resume() */
#endif

/* PCI Devices supported by this driver */
static struct pci_device_id twl_pci_tbl[] __devinitdata = {
	{ PCI_VDEVICE(3WARE, PCI_DEVICE_ID_3WARE_9750) },
	{ }
};
MODULE_DEVICE_TABLE(pci, twl_pci_tbl);

/* pci_driver initializer */
static struct pci_driver twl_driver = {
	.name		= "3w-sas",
	.id_table	= twl_pci_tbl,
	.probe		= twl_probe,
	.remove		= twl_remove,
#ifdef CONFIG_PM
	.suspend	= twl_suspend,
	.resume		= twl_resume,
#endif
	.shutdown	= twl_shutdown
};

/* This function is called on driver initialization */
static int __init twl_init(void)
{
	printk(KERN_INFO "LSI 3ware SAS/SATA-RAID Controller device driver for Linux v%s.\n", TW_DRIVER_VERSION);

	return pci_register_driver(&twl_driver);
} /* End twl_init() */

/* This function is called on driver exit */
static void __exit twl_exit(void)
{
	pci_unregister_driver(&twl_driver);
} /* End twl_exit() */

module_init(twl_init);
module_exit(twl_exit);