aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/storage/isd200.c
blob: e9cbc1467f76428749adb952c462efdced0e5608 (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
/* Transport & Protocol Driver for In-System Design, Inc. ISD200 ASIC
 *
 * Current development and maintenance:
 *   (C) 2001-2002 Björn Stenberg (bjorn@haxx.se)
 *
 * Developed with the assistance of:
 *   (C) 2002 Alan Stern <stern@rowland.org>
 *
 * Initial work:
 *   (C) 2000 In-System Design, Inc. (support@in-system.com)
 *
 * The ISD200 ASIC does not natively support ATA devices.  The chip
 * does implement an interface, the ATA Command Block (ATACB) which provides
 * a means of passing ATA commands and ATA register accesses to a device.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * History:
 *
 *  2002-10-19: Removed the specialized transfer routines.
 *		(Alan Stern <stern@rowland.harvard.edu>)
 *  2001-02-24: Removed lots of duplicate code and simplified the structure.
 *	      (bjorn@haxx.se)
 *  2002-01-16: Fixed endianness bug so it works on the ppc arch.
 *	      (Luc Saillard <luc@saillard.org>)
 *  2002-01-17: All bitfields removed.
 *	      (bjorn@haxx.se)
 */


/* Include files */

#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ata.h>
#include <linux/hdreg.h>
#include <linux/scatterlist.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>

#include "usb.h"
#include "transport.h"
#include "protocol.h"
#include "debug.h"
#include "scsiglue.h"

MODULE_DESCRIPTION("Driver for In-System Design, Inc. ISD200 ASIC");
MODULE_AUTHOR("Björn Stenberg <bjorn@haxx.se>");
MODULE_LICENSE("GPL");

static int isd200_Initialization(struct us_data *us);


/*
 * The table of devices
 */
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
		    vendorName, productName, useProtocol, useTransport, \
		    initFunction, flags) \
{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
  .driver_info = (flags)|(USB_US_TYPE_STOR<<24) }

struct usb_device_id isd200_usb_ids[] = {
#	include "unusual_isd200.h"
	{ }		/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, isd200_usb_ids);

#undef UNUSUAL_DEV
#undef USUAL_DEV

/*
 * The flags table
 */
#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
		    vendor_name, product_name, use_protocol, use_transport, \
		    init_function, Flags) \
{ \
	.vendorName = vendor_name,	\
	.productName = product_name,	\
	.useProtocol = use_protocol,	\
	.useTransport = use_transport,	\
	.initFunction = init_function,	\
}

static struct us_unusual_dev isd200_unusual_dev_list[] = {
#	include "unusual_isd200.h"
	{ }		/* Terminating entry */
};

#undef UNUSUAL_DEV
#undef USUAL_DEV


/* Timeout defines (in Seconds) */

#define ISD200_ENUM_BSY_TIMEOUT		35
#define ISD200_ENUM_DETECT_TIMEOUT      30
#define ISD200_DEFAULT_TIMEOUT		30

/* device flags */
#define DF_ATA_DEVICE		0x0001
#define DF_MEDIA_STATUS_ENABLED	0x0002
#define DF_REMOVABLE_MEDIA	0x0004

/* capability bit definitions */
#define CAPABILITY_DMA		0x01
#define CAPABILITY_LBA		0x02

/* command_setX bit definitions */
#define COMMANDSET_REMOVABLE	0x02
#define COMMANDSET_MEDIA_STATUS 0x10

/* ATA Vendor Specific defines */
#define ATA_ADDRESS_DEVHEAD_STD      0xa0
#define ATA_ADDRESS_DEVHEAD_LBA_MODE 0x40    
#define ATA_ADDRESS_DEVHEAD_SLAVE    0x10

/* Action Select bits */
#define ACTION_SELECT_0	     0x01
#define ACTION_SELECT_1	     0x02
#define ACTION_SELECT_2	     0x04
#define ACTION_SELECT_3	     0x08
#define ACTION_SELECT_4	     0x10
#define ACTION_SELECT_5	     0x20
#define ACTION_SELECT_6	     0x40
#define ACTION_SELECT_7	     0x80

/* Register Select bits */
#define REG_ALTERNATE_STATUS	0x01
#define REG_DEVICE_CONTROL	0x01
#define REG_ERROR		0x02
#define REG_FEATURES		0x02
#define REG_SECTOR_COUNT	0x04
#define REG_SECTOR_NUMBER	0x08
#define REG_CYLINDER_LOW	0x10
#define REG_CYLINDER_HIGH	0x20
#define REG_DEVICE_HEAD		0x40
#define REG_STATUS		0x80
#define REG_COMMAND		0x80

/* ATA registers offset definitions */
#define ATA_REG_ERROR_OFFSET		1
#define ATA_REG_LCYL_OFFSET		4
#define ATA_REG_HCYL_OFFSET		5
#define ATA_REG_STATUS_OFFSET		7

/* ATA error definitions not in <linux/hdreg.h> */
#define ATA_ERROR_MEDIA_CHANGE		0x20

/* ATA command definitions not in <linux/hdreg.h> */
#define ATA_COMMAND_GET_MEDIA_STATUS	0xDA
#define ATA_COMMAND_MEDIA_EJECT		0xED

/* ATA drive control definitions */
#define ATA_DC_DISABLE_INTERRUPTS	0x02
#define ATA_DC_RESET_CONTROLLER		0x04
#define ATA_DC_REENABLE_CONTROLLER	0x00

/*
 *  General purpose return codes
 */ 

#define ISD200_ERROR		-1
#define ISD200_GOOD		 0

/*
 * Transport return codes
 */

#define ISD200_TRANSPORT_GOOD       0   /* Transport good, command good     */
#define ISD200_TRANSPORT_FAILED     1   /* Transport good, command failed   */
#define ISD200_TRANSPORT_ERROR      2   /* Transport bad (i.e. device dead) */

/* driver action codes */
#define	ACTION_READ_STATUS	0
#define	ACTION_RESET		1
#define	ACTION_REENABLE		2
#define	ACTION_SOFT_RESET	3
#define	ACTION_ENUM		4
#define	ACTION_IDENTIFY		5


/*
 * ata_cdb struct
 */


union ata_cdb {
	struct {
		unsigned char SignatureByte0;
		unsigned char SignatureByte1;
		unsigned char ActionSelect;
		unsigned char RegisterSelect;
		unsigned char TransferBlockSize;
		unsigned char WriteData3F6;
		unsigned char WriteData1F1;
		unsigned char WriteData1F2;
		unsigned char WriteData1F3;
		unsigned char WriteData1F4;
		unsigned char WriteData1F5;
		unsigned char WriteData1F6;
		unsigned char WriteData1F7;
		unsigned char Reserved[3];
	} generic;

	struct {
		unsigned char SignatureByte0;
		unsigned char SignatureByte1;
		unsigned char ActionSelect;
		unsigned char RegisterSelect;
		unsigned char TransferBlockSize;
		unsigned char AlternateStatusByte;
		unsigned char ErrorByte;
		unsigned char SectorCountByte;
		unsigned char SectorNumberByte;
		unsigned char CylinderLowByte;
		unsigned char CylinderHighByte;
		unsigned char DeviceHeadByte;
		unsigned char StatusByte;
		unsigned char Reserved[3];
	} read;

	struct {
		unsigned char SignatureByte0;
		unsigned char SignatureByte1;
		unsigned char ActionSelect;
		unsigned char RegisterSelect;
		unsigned char TransferBlockSize;
		unsigned char DeviceControlByte;
		unsigned char FeaturesByte;
		unsigned char SectorCountByte;
		unsigned char SectorNumberByte;
		unsigned char CylinderLowByte;
		unsigned char CylinderHighByte;
		unsigned char DeviceHeadByte;
		unsigned char CommandByte;
		unsigned char Reserved[3];
	} write;
};


/*
 * Inquiry data structure. This is the data returned from the target
 * after it receives an inquiry.
 *
 * This structure may be extended by the number of bytes specified
 * in the field AdditionalLength. The defined size constant only
 * includes fields through ProductRevisionLevel.
 */

/*
 * DeviceType field
 */
#define DIRECT_ACCESS_DEVICE	    0x00    /* disks */
#define DEVICE_REMOVABLE		0x80

struct inquiry_data {
   	unsigned char DeviceType;
	unsigned char DeviceTypeModifier;
	unsigned char Versions;
	unsigned char Format; 
	unsigned char AdditionalLength;
	unsigned char Reserved[2];
	unsigned char Capability;
	unsigned char VendorId[8];
	unsigned char ProductId[16];
	unsigned char ProductRevisionLevel[4];
	unsigned char VendorSpecific[20];
	unsigned char Reserved3[40];
} __attribute__ ((packed));

/*
 * INQUIRY data buffer size
 */

#define INQUIRYDATABUFFERSIZE 36


/*
 * ISD200 CONFIG data struct
 */

#define ATACFG_TIMING	  0x0f
#define ATACFG_ATAPI_RESET     0x10
#define ATACFG_MASTER	  0x20
#define ATACFG_BLOCKSIZE       0xa0

#define ATACFGE_LAST_LUN       0x07
#define ATACFGE_DESC_OVERRIDE  0x08
#define ATACFGE_STATE_SUSPEND  0x10
#define ATACFGE_SKIP_BOOT      0x20
#define ATACFGE_CONF_DESC2     0x40
#define ATACFGE_INIT_STATUS    0x80

#define CFG_CAPABILITY_SRST    0x01

struct isd200_config {
	unsigned char EventNotification;
	unsigned char ExternalClock;
	unsigned char ATAInitTimeout;
	unsigned char ATAConfig;
	unsigned char ATAMajorCommand;
	unsigned char ATAMinorCommand;
	unsigned char ATAExtraConfig;
	unsigned char Capability;
}__attribute__ ((packed));


/*
 * ISD200 driver information struct
 */

struct isd200_info {
	struct inquiry_data InquiryData;
	u16 *id;
	struct isd200_config ConfigData;
	unsigned char *RegsBuf;
	unsigned char ATARegs[8];
	unsigned char DeviceHead;
	unsigned char DeviceFlags;

	/* maximum number of LUNs supported */
	unsigned char MaxLUNs;
	unsigned char cmnd[BLK_MAX_CDB];
	struct scsi_cmnd srb;
	struct scatterlist sg;
};


/*
 * Read Capacity Data - returned in Big Endian format
 */

struct read_capacity_data {
	__be32 LogicalBlockAddress;
	__be32 BytesPerBlock;
};

/*
 * Read Block Limits Data - returned in Big Endian format
 * This structure returns the maximum and minimum block
 * size for a TAPE device.
 */

struct read_block_limits {
	unsigned char Reserved;
	unsigned char BlockMaximumSize[3];
	unsigned char BlockMinimumSize[2];
};


/*
 * Sense Data Format
 */

#define SENSE_ERRCODE	   0x7f
#define SENSE_ERRCODE_VALID     0x80
#define SENSE_FLAG_SENSE_KEY    0x0f
#define SENSE_FLAG_BAD_LENGTH   0x20
#define SENSE_FLAG_END_OF_MEDIA 0x40
#define SENSE_FLAG_FILE_MARK    0x80
struct sense_data {
	unsigned char ErrorCode;
	unsigned char SegmentNumber;
	unsigned char Flags;
	unsigned char Information[4];
	unsigned char AdditionalSenseLength;
	unsigned char CommandSpecificInformation[4];
	unsigned char AdditionalSenseCode;
	unsigned char AdditionalSenseCodeQualifier;
	unsigned char FieldReplaceableUnitCode;
	unsigned char SenseKeySpecific[3];
} __attribute__ ((packed));

/*
 * Default request sense buffer size
 */

#define SENSE_BUFFER_SIZE 18

/***********************************************************************
 * Helper routines
 ***********************************************************************/

/**************************************************************************
 * isd200_build_sense
 *									 
 *  Builds an artificial sense buffer to report the results of a 
 *  failed command.
 *								       
 * RETURNS:
 *    void
 */
static void isd200_build_sense(struct us_data *us, struct scsi_cmnd *srb)
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	struct sense_data *buf = (struct sense_data *) &srb->sense_buffer[0];
	unsigned char error = info->ATARegs[ATA_REG_ERROR_OFFSET];

	if(error & ATA_ERROR_MEDIA_CHANGE) {
		buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
		buf->AdditionalSenseLength = 0xb;
		buf->Flags = UNIT_ATTENTION;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	} else if (error & ATA_MCR) {
		buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
		buf->AdditionalSenseLength = 0xb;
		buf->Flags =  UNIT_ATTENTION;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	} else if (error & ATA_TRK0NF) {
		buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
		buf->AdditionalSenseLength = 0xb;
		buf->Flags =  NOT_READY;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	} else if (error & ATA_UNC) {
		buf->ErrorCode = 0x70 | SENSE_ERRCODE_VALID;
		buf->AdditionalSenseLength = 0xb;
		buf->Flags =  DATA_PROTECT;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	} else {
		buf->ErrorCode = 0;
		buf->AdditionalSenseLength = 0;
		buf->Flags =  0;
		buf->AdditionalSenseCode = 0;
		buf->AdditionalSenseCodeQualifier = 0;
	}
}


/***********************************************************************
 * Transport routines
 ***********************************************************************/

/**************************************************************************
 *  isd200_set_srb(), isd200_srb_set_bufflen()
 *
 * Two helpers to facilitate in initialization of scsi_cmnd structure
 * Will need to change when struct scsi_cmnd changes
 */
static void isd200_set_srb(struct isd200_info *info,
	enum dma_data_direction dir, void* buff, unsigned bufflen)
{
	struct scsi_cmnd *srb = &info->srb;

	if (buff)
		sg_init_one(&info->sg, buff, bufflen);

	srb->sc_data_direction = dir;
	srb->sdb.table.sgl = buff ? &info->sg : NULL;
	srb->sdb.length = bufflen;
	srb->sdb.table.nents = buff ? 1 : 0;
}

static void isd200_srb_set_bufflen(struct scsi_cmnd *srb, unsigned bufflen)
{
	srb->sdb.length = bufflen;
}


/**************************************************************************
 *  isd200_action
 *
 * Routine for sending commands to the isd200
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_action( struct us_data *us, int action, 
			  void* pointer, int value )
{
	union ata_cdb ata;
	/* static to prevent this large struct being placed on the valuable stack */
	static struct scsi_device srb_dev;
	struct isd200_info *info = (struct isd200_info *)us->extra;
	struct scsi_cmnd *srb = &info->srb;
	int status;

	memset(&ata, 0, sizeof(ata));
	srb->cmnd = info->cmnd;
	srb->device = &srb_dev;
	++srb->serial_number;

	ata.generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
	ata.generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
	ata.generic.TransferBlockSize = 1;

	switch ( action ) {
	case ACTION_READ_STATUS:
		US_DEBUGP("   isd200_action(READ_STATUS)\n");
		ata.generic.ActionSelect = ACTION_SELECT_0|ACTION_SELECT_2;
		ata.generic.RegisterSelect =
		  REG_CYLINDER_LOW | REG_CYLINDER_HIGH |
		  REG_STATUS | REG_ERROR;
		isd200_set_srb(info, DMA_FROM_DEVICE, pointer, value);
		break;

	case ACTION_ENUM:
		US_DEBUGP("   isd200_action(ENUM,0x%02x)\n",value);
		ata.generic.ActionSelect = ACTION_SELECT_1|ACTION_SELECT_2|
					   ACTION_SELECT_3|ACTION_SELECT_4|
					   ACTION_SELECT_5;
		ata.generic.RegisterSelect = REG_DEVICE_HEAD;
		ata.write.DeviceHeadByte = value;
		isd200_set_srb(info, DMA_NONE, NULL, 0);
		break;

	case ACTION_RESET:
		US_DEBUGP("   isd200_action(RESET)\n");
		ata.generic.ActionSelect = ACTION_SELECT_1|ACTION_SELECT_2|
					   ACTION_SELECT_3|ACTION_SELECT_4;
		ata.generic.RegisterSelect = REG_DEVICE_CONTROL;
		ata.write.DeviceControlByte = ATA_DC_RESET_CONTROLLER;
		isd200_set_srb(info, DMA_NONE, NULL, 0);
		break;

	case ACTION_REENABLE:
		US_DEBUGP("   isd200_action(REENABLE)\n");
		ata.generic.ActionSelect = ACTION_SELECT_1|ACTION_SELECT_2|
					   ACTION_SELECT_3|ACTION_SELECT_4;
		ata.generic.RegisterSelect = REG_DEVICE_CONTROL;
		ata.write.DeviceControlByte = ATA_DC_REENABLE_CONTROLLER;
		isd200_set_srb(info, DMA_NONE, NULL, 0);
		break;

	case ACTION_SOFT_RESET:
		US_DEBUGP("   isd200_action(SOFT_RESET)\n");
		ata.generic.ActionSelect = ACTION_SELECT_1|ACTION_SELECT_5;
		ata.generic.RegisterSelect = REG_DEVICE_HEAD | REG_COMMAND;
		ata.write.DeviceHeadByte = info->DeviceHead;
		ata.write.CommandByte = ATA_CMD_DEV_RESET;
		isd200_set_srb(info, DMA_NONE, NULL, 0);
		break;

	case ACTION_IDENTIFY:
		US_DEBUGP("   isd200_action(IDENTIFY)\n");
		ata.generic.RegisterSelect = REG_COMMAND;
		ata.write.CommandByte = ATA_CMD_ID_ATA;
		isd200_set_srb(info, DMA_FROM_DEVICE, info->id,
				ATA_ID_WORDS * 2);
		break;

	default:
		US_DEBUGP("Error: Undefined action %d\n",action);
		return ISD200_ERROR;
	}

	memcpy(srb->cmnd, &ata, sizeof(ata.generic));
	srb->cmd_len = sizeof(ata.generic);
	status = usb_stor_Bulk_transport(srb, us);
	if (status == USB_STOR_TRANSPORT_GOOD)
		status = ISD200_GOOD;
	else {
		US_DEBUGP("   isd200_action(0x%02x) error: %d\n",action,status);
		status = ISD200_ERROR;
		/* need to reset device here */
	}

	return status;
}

/**************************************************************************
 * isd200_read_regs
 *									 
 * Read ATA Registers
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_read_regs( struct us_data *us )
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;
	int transferStatus;

	US_DEBUGP("Entering isd200_IssueATAReadRegs\n");

	transferStatus = isd200_action( us, ACTION_READ_STATUS,
				    info->RegsBuf, sizeof(info->ATARegs) );
	if (transferStatus != ISD200_TRANSPORT_GOOD) {
		US_DEBUGP("   Error reading ATA registers\n");
		retStatus = ISD200_ERROR;
	} else {
		memcpy(info->ATARegs, info->RegsBuf, sizeof(info->ATARegs));
		US_DEBUGP("   Got ATA Register[ATA_REG_ERROR_OFFSET] = 0x%x\n",
			  info->ATARegs[ATA_REG_ERROR_OFFSET]);
	}

	return retStatus;
}


/**************************************************************************
 * Invoke the transport and basic error-handling/recovery methods
 *
 * This is used by the protocol layers to actually send the message to
 * the device and receive the response.
 */
static void isd200_invoke_transport( struct us_data *us, 
			      struct scsi_cmnd *srb, 
			      union ata_cdb *ataCdb )
{
	int need_auto_sense = 0;
	int transferStatus;
	int result;

	/* send the command to the transport layer */
	memcpy(srb->cmnd, ataCdb, sizeof(ataCdb->generic));
	srb->cmd_len = sizeof(ataCdb->generic);
	transferStatus = usb_stor_Bulk_transport(srb, us);

	/* if the command gets aborted by the higher layers, we need to
	 * short-circuit all other processing
	 */
	if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
		US_DEBUGP("-- command was aborted\n");
		goto Handle_Abort;
	}

	switch (transferStatus) {

	case USB_STOR_TRANSPORT_GOOD:
		/* Indicate a good result */
		srb->result = SAM_STAT_GOOD;
		break;

	case USB_STOR_TRANSPORT_NO_SENSE:
		US_DEBUGP("-- transport indicates protocol failure\n");
		srb->result = SAM_STAT_CHECK_CONDITION;
		return;

	case USB_STOR_TRANSPORT_FAILED:
		US_DEBUGP("-- transport indicates command failure\n");
		need_auto_sense = 1;
		break;

	case USB_STOR_TRANSPORT_ERROR:
		US_DEBUGP("-- transport indicates transport error\n");
		srb->result = DID_ERROR << 16;
		/* Need reset here */
		return;
    
	default:
		US_DEBUGP("-- transport indicates unknown error\n");   
		srb->result = DID_ERROR << 16;
		/* Need reset here */
		return;
	}

	if ((scsi_get_resid(srb) > 0) &&
	    !((srb->cmnd[0] == REQUEST_SENSE) ||
	      (srb->cmnd[0] == INQUIRY) ||
	      (srb->cmnd[0] == MODE_SENSE) ||
	      (srb->cmnd[0] == LOG_SENSE) ||
	      (srb->cmnd[0] == MODE_SENSE_10))) {
		US_DEBUGP("-- unexpectedly short transfer\n");
		need_auto_sense = 1;
	}

	if (need_auto_sense) {
		result = isd200_read_regs(us);
		if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
			US_DEBUGP("-- auto-sense aborted\n");
			goto Handle_Abort;
		}
		if (result == ISD200_GOOD) {
			isd200_build_sense(us, srb);
			srb->result = SAM_STAT_CHECK_CONDITION;

			/* If things are really okay, then let's show that */
			if ((srb->sense_buffer[2] & 0xf) == 0x0)
				srb->result = SAM_STAT_GOOD;
		} else {
			srb->result = DID_ERROR << 16;
			/* Need reset here */
		}
	}

	/* Regardless of auto-sense, if we _know_ we have an error
	 * condition, show that in the result code
	 */
	if (transferStatus == USB_STOR_TRANSPORT_FAILED)
		srb->result = SAM_STAT_CHECK_CONDITION;
	return;

	/* abort processing: the bulk-only transport requires a reset
	 * following an abort */
	Handle_Abort:
	srb->result = DID_ABORT << 16;

	/* permit the reset transfer to take place */
	clear_bit(US_FLIDX_ABORTING, &us->dflags);
	/* Need reset here */
}

#ifdef CONFIG_USB_STORAGE_DEBUG
static void isd200_log_config( struct isd200_info* info )
{
	US_DEBUGP("      Event Notification: 0x%x\n", 
		  info->ConfigData.EventNotification);
	US_DEBUGP("      External Clock: 0x%x\n", 
		  info->ConfigData.ExternalClock);
	US_DEBUGP("      ATA Init Timeout: 0x%x\n", 
		  info->ConfigData.ATAInitTimeout);
	US_DEBUGP("      ATAPI Command Block Size: 0x%x\n", 
		  (info->ConfigData.ATAConfig & ATACFG_BLOCKSIZE) >> 6);
	US_DEBUGP("      Master/Slave Selection: 0x%x\n", 
		  info->ConfigData.ATAConfig & ATACFG_MASTER);
	US_DEBUGP("      ATAPI Reset: 0x%x\n",
		  info->ConfigData.ATAConfig & ATACFG_ATAPI_RESET);
	US_DEBUGP("      ATA Timing: 0x%x\n",
		  info->ConfigData.ATAConfig & ATACFG_TIMING);
	US_DEBUGP("      ATA Major Command: 0x%x\n", 
		  info->ConfigData.ATAMajorCommand);
	US_DEBUGP("      ATA Minor Command: 0x%x\n", 
		  info->ConfigData.ATAMinorCommand);
	US_DEBUGP("      Init Status: 0x%x\n", 
		  info->ConfigData.ATAExtraConfig & ATACFGE_INIT_STATUS);
	US_DEBUGP("      Config Descriptor 2: 0x%x\n", 
		  info->ConfigData.ATAExtraConfig & ATACFGE_CONF_DESC2);
	US_DEBUGP("      Skip Device Boot: 0x%x\n",
		  info->ConfigData.ATAExtraConfig & ATACFGE_SKIP_BOOT);
	US_DEBUGP("      ATA 3 State Supsend: 0x%x\n",
		  info->ConfigData.ATAExtraConfig & ATACFGE_STATE_SUSPEND);
	US_DEBUGP("      Descriptor Override: 0x%x\n", 
		  info->ConfigData.ATAExtraConfig & ATACFGE_DESC_OVERRIDE);
	US_DEBUGP("      Last LUN Identifier: 0x%x\n",
		  info->ConfigData.ATAExtraConfig & ATACFGE_LAST_LUN);
	US_DEBUGP("      SRST Enable: 0x%x\n", 
		  info->ConfigData.ATAExtraConfig & CFG_CAPABILITY_SRST);
}
#endif

/**************************************************************************
 * isd200_write_config
 *									 
 * Write the ISD200 Configuration data
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_write_config( struct us_data *us ) 
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;
	int result;

#ifdef CONFIG_USB_STORAGE_DEBUG
	US_DEBUGP("Entering isd200_write_config\n");
	US_DEBUGP("   Writing the following ISD200 Config Data:\n");
	isd200_log_config(info);
#endif

	/* let's send the command via the control pipe */
	result = usb_stor_ctrl_transfer(
		us, 
		us->send_ctrl_pipe,
		0x01, 
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
		0x0000, 
		0x0002, 
		(void *) &info->ConfigData, 
		sizeof(info->ConfigData));

	if (result >= 0) {
		US_DEBUGP("   ISD200 Config Data was written successfully\n");
	} else {
		US_DEBUGP("   Request to write ISD200 Config Data failed!\n");
		retStatus = ISD200_ERROR;
	}

	US_DEBUGP("Leaving isd200_write_config %08X\n", retStatus);
	return retStatus;
}


/**************************************************************************
 * isd200_read_config
 *									 
 * Reads the ISD200 Configuration data
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_read_config( struct us_data *us ) 
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;
	int result;

	US_DEBUGP("Entering isd200_read_config\n");

	/* read the configuration information from ISD200.  Use this to */
	/* determine what the special ATA CDB bytes are.		*/

	result = usb_stor_ctrl_transfer(
		us, 
		us->recv_ctrl_pipe,
		0x02, 
		USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
		0x0000, 
		0x0002, 
		(void *) &info->ConfigData, 
		sizeof(info->ConfigData));


	if (result >= 0) {
		US_DEBUGP("   Retrieved the following ISD200 Config Data:\n");
#ifdef CONFIG_USB_STORAGE_DEBUG
		isd200_log_config(info);
#endif
	} else {
		US_DEBUGP("   Request to get ISD200 Config Data failed!\n");
		retStatus = ISD200_ERROR;
	}

	US_DEBUGP("Leaving isd200_read_config %08X\n", retStatus);
	return retStatus;
}


/**************************************************************************
 * isd200_atapi_soft_reset
 *									 
 * Perform an Atapi Soft Reset on the device
 *
 * RETURNS:
 *    NT status code
 */
static int isd200_atapi_soft_reset( struct us_data *us ) 
{
	int retStatus = ISD200_GOOD;
	int transferStatus;

	US_DEBUGP("Entering isd200_atapi_soft_reset\n");

	transferStatus = isd200_action( us, ACTION_SOFT_RESET, NULL, 0 );
	if (transferStatus != ISD200_TRANSPORT_GOOD) {
		US_DEBUGP("   Error issuing Atapi Soft Reset\n");
		retStatus = ISD200_ERROR;
	}

	US_DEBUGP("Leaving isd200_atapi_soft_reset %08X\n", retStatus);
	return retStatus;
}


/**************************************************************************
 * isd200_srst
 *									 
 * Perform an SRST on the device
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_srst( struct us_data *us ) 
{
	int retStatus = ISD200_GOOD;
	int transferStatus;

	US_DEBUGP("Entering isd200_SRST\n");

	transferStatus = isd200_action( us, ACTION_RESET, NULL, 0 );

	/* check to see if this request failed */
	if (transferStatus != ISD200_TRANSPORT_GOOD) {
		US_DEBUGP("   Error issuing SRST\n");
		retStatus = ISD200_ERROR;
	} else {
		/* delay 10ms to give the drive a chance to see it */
		msleep(10);

		transferStatus = isd200_action( us, ACTION_REENABLE, NULL, 0 );
		if (transferStatus != ISD200_TRANSPORT_GOOD) {
			US_DEBUGP("   Error taking drive out of reset\n");
			retStatus = ISD200_ERROR;
		} else {
			/* delay 50ms to give the drive a chance to recover after SRST */
			msleep(50);
		}
	}

	US_DEBUGP("Leaving isd200_srst %08X\n", retStatus);
	return retStatus;
}


/**************************************************************************
 * isd200_try_enum
 *									 
 * Helper function for isd200_manual_enum(). Does ENUM and READ_STATUS
 * and tries to analyze the status registers
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_try_enum(struct us_data *us, unsigned char master_slave,
			   int detect )
{
	int status = ISD200_GOOD;
	unsigned long endTime;
	struct isd200_info *info = (struct isd200_info *)us->extra;
	unsigned char *regs = info->RegsBuf;
	int recheckAsMaster = 0;

	if ( detect )
		endTime = jiffies + ISD200_ENUM_DETECT_TIMEOUT * HZ;
	else
		endTime = jiffies + ISD200_ENUM_BSY_TIMEOUT * HZ;

	/* loop until we detect !BSY or timeout */
	while(1) {
#ifdef CONFIG_USB_STORAGE_DEBUG
		char* mstr = master_slave == ATA_ADDRESS_DEVHEAD_STD ?
			"Master" : "Slave";
#endif

		status = isd200_action( us, ACTION_ENUM, NULL, master_slave );
		if ( status != ISD200_GOOD )
			break;

		status = isd200_action( us, ACTION_READ_STATUS, 
					regs, 8 );
		if ( status != ISD200_GOOD )
			break;

		if (!detect) {
			if (regs[ATA_REG_STATUS_OFFSET] & ATA_BUSY) {
				US_DEBUGP("   %s status is still BSY, try again...\n",mstr);
			} else {
				US_DEBUGP("   %s status !BSY, continue with next operation\n",mstr);
				break;
			}
		}
		/* check for ATA_BUSY and */
		/* ATA_DF (workaround ATA Zip drive) and */
		/* ATA_ERR (workaround for Archos CD-ROM) */
		else if (regs[ATA_REG_STATUS_OFFSET] &
			 (ATA_BUSY | ATA_DF | ATA_ERR)) {
			US_DEBUGP("   Status indicates it is not ready, try again...\n");
		}
		/* check for DRDY, ATA devices set DRDY after SRST */
		else if (regs[ATA_REG_STATUS_OFFSET] & ATA_DRDY) {
			US_DEBUGP("   Identified ATA device\n");
			info->DeviceFlags |= DF_ATA_DEVICE;
			info->DeviceHead = master_slave;
			break;
		} 
		/* check Cylinder High/Low to
		   determine if it is an ATAPI device
		*/
		else if (regs[ATA_REG_HCYL_OFFSET] == 0xEB &&
			 regs[ATA_REG_LCYL_OFFSET] == 0x14) {
			/* It seems that the RICOH 
			   MP6200A CD/RW drive will 
			   report itself okay as a
			   slave when it is really a
			   master. So this check again
			   as a master device just to
			   make sure it doesn't report
			   itself okay as a master also
			*/
			if ((master_slave & ATA_ADDRESS_DEVHEAD_SLAVE) &&
			    !recheckAsMaster) {
				US_DEBUGP("   Identified ATAPI device as slave.  Rechecking again as master\n");
				recheckAsMaster = 1;
				master_slave = ATA_ADDRESS_DEVHEAD_STD;
			} else {
				US_DEBUGP("   Identified ATAPI device\n");
				info->DeviceHead = master_slave;
			      
				status = isd200_atapi_soft_reset(us);
				break;
			}
		} else {
 			US_DEBUGP("   Not ATA, not ATAPI. Weird.\n");
			break;
		}

		/* check for timeout on this request */
		if (time_after_eq(jiffies, endTime)) {
			if (!detect)
				US_DEBUGP("   BSY check timeout, just continue with next operation...\n");
			else
				US_DEBUGP("   Device detect timeout!\n");
			break;
		}
	}

	return status;
}

/**************************************************************************
 * isd200_manual_enum
 *									 
 * Determines if the drive attached is an ATA or ATAPI and if it is a
 * master or slave.
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_manual_enum(struct us_data *us)
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;

	US_DEBUGP("Entering isd200_manual_enum\n");

	retStatus = isd200_read_config(us);
	if (retStatus == ISD200_GOOD) {
		int isslave;
		/* master or slave? */
		retStatus = isd200_try_enum( us, ATA_ADDRESS_DEVHEAD_STD, 0);
		if (retStatus == ISD200_GOOD)
			retStatus = isd200_try_enum( us, ATA_ADDRESS_DEVHEAD_SLAVE, 0);

		if (retStatus == ISD200_GOOD) {
			retStatus = isd200_srst(us);
			if (retStatus == ISD200_GOOD)
				/* ata or atapi? */
				retStatus = isd200_try_enum( us, ATA_ADDRESS_DEVHEAD_STD, 1);
		}

		isslave = (info->DeviceHead & ATA_ADDRESS_DEVHEAD_SLAVE) ? 1 : 0;
		if (!(info->ConfigData.ATAConfig & ATACFG_MASTER)) {
			US_DEBUGP("   Setting Master/Slave selection to %d\n", isslave);
			info->ConfigData.ATAConfig &= 0x3f;
			info->ConfigData.ATAConfig |= (isslave<<6);
			retStatus = isd200_write_config(us);
		}
	}

	US_DEBUGP("Leaving isd200_manual_enum %08X\n", retStatus);
	return(retStatus);
}

static void isd200_fix_driveid(u16 *id)
{
#ifndef __LITTLE_ENDIAN
# ifdef __BIG_ENDIAN
	int i;

	for (i = 0; i < ATA_ID_WORDS; i++)
		id[i] = __le16_to_cpu(id[i]);
# else
#  error "Please fix <asm/byteorder.h>"
# endif
#endif
}

static void isd200_dump_driveid(u16 *id)
{
	US_DEBUGP("   Identify Data Structure:\n");
	US_DEBUGP("      config = 0x%x\n",	  id[ATA_ID_CONFIG]);
	US_DEBUGP("      cyls = 0x%x\n",	  id[ATA_ID_CYLS]);
	US_DEBUGP("      heads = 0x%x\n",	  id[ATA_ID_HEADS]);
	US_DEBUGP("      track_bytes = 0x%x\n",	  id[4]);
	US_DEBUGP("      sector_bytes = 0x%x\n",  id[5]);
	US_DEBUGP("      sectors = 0x%x\n",	  id[ATA_ID_SECTORS]);
	US_DEBUGP("      serial_no[0] = 0x%x\n",  *(char *)&id[ATA_ID_SERNO]);
	US_DEBUGP("      buf_type = 0x%x\n",	  id[20]);
	US_DEBUGP("      buf_size = 0x%x\n",	  id[ATA_ID_BUF_SIZE]);
	US_DEBUGP("      ecc_bytes = 0x%x\n",	  id[22]);
	US_DEBUGP("      fw_rev[0] = 0x%x\n",	  *(char *)&id[ATA_ID_FW_REV]);
	US_DEBUGP("      model[0] = 0x%x\n",	  *(char *)&id[ATA_ID_PROD]);
	US_DEBUGP("      max_multsect = 0x%x\n",  id[ATA_ID_MAX_MULTSECT] & 0xff);
	US_DEBUGP("      dword_io = 0x%x\n",	  id[ATA_ID_DWORD_IO]);
	US_DEBUGP("      capability = 0x%x\n",	  id[ATA_ID_CAPABILITY] >> 8);
	US_DEBUGP("      tPIO = 0x%x\n",	  id[ATA_ID_OLD_PIO_MODES] >> 8);
	US_DEBUGP("      tDMA = 0x%x\n",	  id[ATA_ID_OLD_DMA_MODES] >> 8);
	US_DEBUGP("      field_valid = 0x%x\n",	  id[ATA_ID_FIELD_VALID]);
	US_DEBUGP("      cur_cyls = 0x%x\n",	  id[ATA_ID_CUR_CYLS]);
	US_DEBUGP("      cur_heads = 0x%x\n",	  id[ATA_ID_CUR_HEADS]);
	US_DEBUGP("      cur_sectors = 0x%x\n",	  id[ATA_ID_CUR_SECTORS]);
	US_DEBUGP("      cur_capacity = 0x%x\n",  ata_id_u32(id, 57));
	US_DEBUGP("      multsect = 0x%x\n",	  id[ATA_ID_MULTSECT] & 0xff);
	US_DEBUGP("      lba_capacity = 0x%x\n",  ata_id_u32(id, ATA_ID_LBA_CAPACITY));
	US_DEBUGP("      command_set_1 = 0x%x\n", id[ATA_ID_COMMAND_SET_1]);
	US_DEBUGP("      command_set_2 = 0x%x\n", id[ATA_ID_COMMAND_SET_2]);
}

/**************************************************************************
 * isd200_get_inquiry_data
 *
 * Get inquiry data
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_get_inquiry_data( struct us_data *us )
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	int retStatus = ISD200_GOOD;
	u16 *id = info->id;

	US_DEBUGP("Entering isd200_get_inquiry_data\n");

	/* set default to Master */
	info->DeviceHead = ATA_ADDRESS_DEVHEAD_STD;

	/* attempt to manually enumerate this device */
	retStatus = isd200_manual_enum(us);
	if (retStatus == ISD200_GOOD) {
		int transferStatus;

		/* check for an ATA device */
		if (info->DeviceFlags & DF_ATA_DEVICE) {
			/* this must be an ATA device */
			/* perform an ATA Command Identify */
			transferStatus = isd200_action( us, ACTION_IDENTIFY,
							id, ATA_ID_WORDS * 2);
			if (transferStatus != ISD200_TRANSPORT_GOOD) {
				/* Error issuing ATA Command Identify */
				US_DEBUGP("   Error issuing ATA Command Identify\n");
				retStatus = ISD200_ERROR;
			} else {
				/* ATA Command Identify successful */
				int i;
				__be16 *src;
				__u16 *dest;

				isd200_fix_driveid(id);
				isd200_dump_driveid(id);

				memset(&info->InquiryData, 0, sizeof(info->InquiryData));

				/* Standard IDE interface only supports disks */
				info->InquiryData.DeviceType = DIRECT_ACCESS_DEVICE;

				/* The length must be at least 36 (5 + 31) */
				info->InquiryData.AdditionalLength = 0x1F;

				if (id[ATA_ID_COMMAND_SET_1] & COMMANDSET_MEDIA_STATUS) {
					/* set the removable bit */
					info->InquiryData.DeviceTypeModifier = DEVICE_REMOVABLE;
					info->DeviceFlags |= DF_REMOVABLE_MEDIA;
				}

				/* Fill in vendor identification fields */
				src = (__be16 *)&id[ATA_ID_PROD];
				dest = (__u16*)info->InquiryData.VendorId;
				for (i=0;i<4;i++)
					dest[i] = be16_to_cpu(src[i]);

				src = (__be16 *)&id[ATA_ID_PROD + 8/2];
				dest = (__u16*)info->InquiryData.ProductId;
				for (i=0;i<8;i++)
					dest[i] = be16_to_cpu(src[i]);

				src = (__be16 *)&id[ATA_ID_FW_REV];
				dest = (__u16*)info->InquiryData.ProductRevisionLevel;
				for (i=0;i<2;i++)
					dest[i] = be16_to_cpu(src[i]);

				/* determine if it supports Media Status Notification */
				if (id[ATA_ID_COMMAND_SET_2] & COMMANDSET_MEDIA_STATUS) {
					US_DEBUGP("   Device supports Media Status Notification\n");

					/* Indicate that it is enabled, even though it is not
					 * This allows the lock/unlock of the media to work
					 * correctly.
					 */
					info->DeviceFlags |= DF_MEDIA_STATUS_ENABLED;
				}
				else
					info->DeviceFlags &= ~DF_MEDIA_STATUS_ENABLED;

			}
		} else {
			/* 
			 * this must be an ATAPI device 
			 * use an ATAPI protocol (Transparent SCSI)
			 */
			us->protocol_name = "Transparent SCSI";
			us->proto_handler = usb_stor_transparent_scsi_command;

			US_DEBUGP("Protocol changed to: %s\n", us->protocol_name);
	    
			/* Free driver structure */	    
			us->extra_destructor(info);
			kfree(info);
			us->extra = NULL;
			us->extra_destructor = NULL;
		}
	}

	US_DEBUGP("Leaving isd200_get_inquiry_data %08X\n", retStatus);

	return(retStatus);
}

/**************************************************************************
 * isd200_scsi_to_ata
 *									 
 * Translate SCSI commands to ATA commands.
 *
 * RETURNS:
 *    1 if the command needs to be sent to the transport layer
 *    0 otherwise
 */
static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us,
			      union ata_cdb * ataCdb)
{
	struct isd200_info *info = (struct isd200_info *)us->extra;
	u16 *id = info->id;
	int sendToTransport = 1;
	unsigned char sectnum, head;
	unsigned short cylinder;
	unsigned long lba;
	unsigned long blockCount;
	unsigned char senseData[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };

	memset(ataCdb, 0, sizeof(union ata_cdb));

	/* SCSI Command */
	switch (srb->cmnd[0]) {
	case INQUIRY:
		US_DEBUGP("   ATA OUT - INQUIRY\n");

		/* copy InquiryData */
		usb_stor_set_xfer_buf((unsigned char *) &info->InquiryData,
				sizeof(info->InquiryData), srb);
		srb->result = SAM_STAT_GOOD;
		sendToTransport = 0;
		break;

	case MODE_SENSE:
		US_DEBUGP("   ATA OUT - SCSIOP_MODE_SENSE\n");

		/* Initialize the return buffer */
		usb_stor_set_xfer_buf(senseData, sizeof(senseData), srb);

		if (info->DeviceFlags & DF_MEDIA_STATUS_ENABLED)
		{
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 1;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS;
			isd200_srb_set_bufflen(srb, 0);
		} else {
			US_DEBUGP("   Media Status not supported, just report okay\n");
			srb->result = SAM_STAT_GOOD;
			sendToTransport = 0;
		}
		break;

	case TEST_UNIT_READY:
		US_DEBUGP("   ATA OUT - SCSIOP_TEST_UNIT_READY\n");

		if (info->DeviceFlags & DF_MEDIA_STATUS_ENABLED)
		{
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 1;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS;
			isd200_srb_set_bufflen(srb, 0);
		} else {
			US_DEBUGP("   Media Status not supported, just report okay\n");
			srb->result = SAM_STAT_GOOD;
			sendToTransport = 0;
		}
		break;

	case READ_CAPACITY:
	{
		unsigned long capacity;
		struct read_capacity_data readCapacityData;

		US_DEBUGP("   ATA OUT - SCSIOP_READ_CAPACITY\n");

		if (ata_id_has_lba(id))
			capacity = ata_id_u32(id, ATA_ID_LBA_CAPACITY) - 1;
		else
			capacity = (id[ATA_ID_HEADS] * id[ATA_ID_CYLS] *
				    id[ATA_ID_SECTORS]) - 1;

		readCapacityData.LogicalBlockAddress = cpu_to_be32(capacity);
		readCapacityData.BytesPerBlock = cpu_to_be32(0x200);

		usb_stor_set_xfer_buf((unsigned char *) &readCapacityData,
				sizeof(readCapacityData), srb);
		srb->result = SAM_STAT_GOOD;
		sendToTransport = 0;
	}
	break;

	case READ_10:
		US_DEBUGP("   ATA OUT - SCSIOP_READ\n");

		lba = be32_to_cpu(*(__be32 *)&srb->cmnd[2]);
		blockCount = (unsigned long)srb->cmnd[7]<<8 | (unsigned long)srb->cmnd[8];

		if (ata_id_has_lba(id)) {
			sectnum = (unsigned char)(lba);
			cylinder = (unsigned short)(lba>>8);
			head = ATA_ADDRESS_DEVHEAD_LBA_MODE | (unsigned char)(lba>>24 & 0x0F);
		} else {
			sectnum = (u8)((lba % id[ATA_ID_SECTORS]) + 1);
			cylinder = (u16)(lba / (id[ATA_ID_SECTORS] *
					id[ATA_ID_HEADS]));
			head = (u8)((lba / id[ATA_ID_SECTORS]) %
					id[ATA_ID_HEADS]);
		}
		ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
		ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
		ataCdb->generic.TransferBlockSize = 1;
		ataCdb->generic.RegisterSelect =
		  REG_SECTOR_COUNT | REG_SECTOR_NUMBER |
		  REG_CYLINDER_LOW | REG_CYLINDER_HIGH |
		  REG_DEVICE_HEAD  | REG_COMMAND;
		ataCdb->write.SectorCountByte = (unsigned char)blockCount;
		ataCdb->write.SectorNumberByte = sectnum;
		ataCdb->write.CylinderHighByte = (unsigned char)(cylinder>>8);
		ataCdb->write.CylinderLowByte = (unsigned char)cylinder;
		ataCdb->write.DeviceHeadByte = (head | ATA_ADDRESS_DEVHEAD_STD);
		ataCdb->write.CommandByte = ATA_CMD_PIO_READ;
		break;

	case WRITE_10:
		US_DEBUGP("   ATA OUT - SCSIOP_WRITE\n");

		lba = be32_to_cpu(*(__be32 *)&srb->cmnd[2]);
		blockCount = (unsigned long)srb->cmnd[7]<<8 | (unsigned long)srb->cmnd[8];

		if (ata_id_has_lba(id)) {
			sectnum = (unsigned char)(lba);
			cylinder = (unsigned short)(lba>>8);
			head = ATA_ADDRESS_DEVHEAD_LBA_MODE | (unsigned char)(lba>>24 & 0x0F);
		} else {
			sectnum = (u8)((lba % id[ATA_ID_SECTORS]) + 1);
			cylinder = (u16)(lba / (id[ATA_ID_SECTORS] *
					id[ATA_ID_HEADS]));
			head = (u8)((lba / id[ATA_ID_SECTORS]) %
					id[ATA_ID_HEADS]);
		}
		ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
		ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
		ataCdb->generic.TransferBlockSize = 1;
		ataCdb->generic.RegisterSelect =
		  REG_SECTOR_COUNT | REG_SECTOR_NUMBER |
		  REG_CYLINDER_LOW | REG_CYLINDER_HIGH |
		  REG_DEVICE_HEAD  | REG_COMMAND;
		ataCdb->write.SectorCountByte = (unsigned char)blockCount;
		ataCdb->write.SectorNumberByte = sectnum;
		ataCdb->write.CylinderHighByte = (unsigned char)(cylinder>>8);
		ataCdb->write.CylinderLowByte = (unsigned char)cylinder;
		ataCdb->write.DeviceHeadByte = (head | ATA_ADDRESS_DEVHEAD_STD);
		ataCdb->write.CommandByte = ATA_CMD_PIO_WRITE;
		break;

	case ALLOW_MEDIUM_REMOVAL:
		US_DEBUGP("   ATA OUT - SCSIOP_MEDIUM_REMOVAL\n");

		if (info->DeviceFlags & DF_REMOVABLE_MEDIA) {
			US_DEBUGP("   srb->cmnd[4] = 0x%X\n", srb->cmnd[4]);
	    
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 1;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = (srb->cmnd[4] & 0x1) ?
				ATA_CMD_MEDIA_LOCK : ATA_CMD_MEDIA_UNLOCK;
			isd200_srb_set_bufflen(srb, 0);
		} else {
			US_DEBUGP("   Not removeable media, just report okay\n");
			srb->result = SAM_STAT_GOOD;
			sendToTransport = 0;
		}
		break;

	case START_STOP:    
		US_DEBUGP("   ATA OUT - SCSIOP_START_STOP_UNIT\n");
		US_DEBUGP("   srb->cmnd[4] = 0x%X\n", srb->cmnd[4]);

		if ((srb->cmnd[4] & 0x3) == 0x2) {
			US_DEBUGP("   Media Eject\n");
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 0;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = ATA_COMMAND_MEDIA_EJECT;
		} else if ((srb->cmnd[4] & 0x3) == 0x1) {
			US_DEBUGP("   Get Media Status\n");
			ataCdb->generic.SignatureByte0 = info->ConfigData.ATAMajorCommand;
			ataCdb->generic.SignatureByte1 = info->ConfigData.ATAMinorCommand;
			ataCdb->generic.TransferBlockSize = 1;
			ataCdb->generic.RegisterSelect = REG_COMMAND;
			ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS;
			isd200_srb_set_bufflen(srb, 0);
		} else {
			US_DEBUGP("   Nothing to do, just report okay\n");
			srb->result = SAM_STAT_GOOD;
			sendToTransport = 0;
		}
		break;

	default:
		US_DEBUGP("Unsupported SCSI command - 0x%X\n", srb->cmnd[0]);
		srb->result = DID_ERROR << 16;
		sendToTransport = 0;
		break;
	}

	return(sendToTransport);
}


/**************************************************************************
 * isd200_free_info
 *
 * Frees the driver structure.
 */
static void isd200_free_info_ptrs(void *info_)
{
	struct isd200_info *info = (struct isd200_info *) info_;

	if (info) {
		kfree(info->id);
		kfree(info->RegsBuf);
		kfree(info->srb.sense_buffer);
	}
}

/**************************************************************************
 * isd200_init_info
 *									 
 * Allocates (if necessary) and initializes the driver structure.
 *
 * RETURNS:
 *    ISD status code
 */
static int isd200_init_info(struct us_data *us)
{
	int retStatus = ISD200_GOOD;
	struct isd200_info *info;

	info = (struct isd200_info *)
			kzalloc(sizeof(struct isd200_info), GFP_KERNEL);
	if (!info)
		retStatus = ISD200_ERROR;
	else {
		info->id = kzalloc(ATA_ID_WORDS * 2, GFP_KERNEL);
		info->RegsBuf = (unsigned char *)
				kmalloc(sizeof(info->ATARegs), GFP_KERNEL);
		info->srb.sense_buffer =
				kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
		if (!info->id || !info->RegsBuf || !info->srb.sense_buffer) {
			isd200_free_info_ptrs(info);
			kfree(info);
			retStatus = ISD200_ERROR;
		}
	}

	if (retStatus == ISD200_GOOD) {
		us->extra = info;
		us->extra_destructor = isd200_free_info_ptrs;
	} else
		US_DEBUGP("ERROR - kmalloc failure\n");

	return retStatus;
}

/**************************************************************************
 * Initialization for the ISD200 
 */

static int isd200_Initialization(struct us_data *us)
{
	US_DEBUGP("ISD200 Initialization...\n");

	/* Initialize ISD200 info struct */

	if (isd200_init_info(us) == ISD200_ERROR) {
		US_DEBUGP("ERROR Initializing ISD200 Info struct\n");
	} else {
		/* Get device specific data */

		if (isd200_get_inquiry_data(us) != ISD200_GOOD)
			US_DEBUGP("ISD200 Initialization Failure\n");
		else
			US_DEBUGP("ISD200 Initialization complete\n");
	}

	return 0;
}


/**************************************************************************
 * Protocol and Transport for the ISD200 ASIC
 *
 * This protocol and transport are for ATA devices connected to an ISD200
 * ASIC.  An ATAPI device that is conected as a slave device will be
 * detected in the driver initialization function and the protocol will
 * be changed to an ATAPI protocol (Transparent SCSI).
 *
 */

static void isd200_ata_command(struct scsi_cmnd *srb, struct us_data *us)
{
	int sendToTransport = 1, orig_bufflen;
	union ata_cdb ataCdb;

	/* Make sure driver was initialized */

	if (us->extra == NULL)
		US_DEBUGP("ERROR Driver not initialized\n");

	scsi_set_resid(srb, 0);
	/* scsi_bufflen might change in protocol translation to ata */
	orig_bufflen = scsi_bufflen(srb);
	sendToTransport = isd200_scsi_to_ata(srb, us, &ataCdb);

	/* send the command to the transport layer */
	if (sendToTransport)
		isd200_invoke_transport(us, srb, &ataCdb);

	isd200_srb_set_bufflen(srb, orig_bufflen);
}

static int isd200_probe(struct usb_interface *intf,
			 const struct usb_device_id *id)
{
	struct us_data *us;
	int result;

	result = usb_stor_probe1(&us, intf, id,
			(id - isd200_usb_ids) + isd200_unusual_dev_list);
	if (result)
		return result;

	us->protocol_name = "ISD200 ATA/ATAPI";
	us->proto_handler = isd200_ata_command;

	result = usb_stor_probe2(us);
	return result;
}

static struct usb_driver isd200_driver = {
	.name =		"ums-isd200",
	.probe =	isd200_probe,
	.disconnect =	usb_stor_disconnect,
	.suspend =	usb_stor_suspend,
	.resume =	usb_stor_resume,
	.reset_resume =	usb_stor_reset_resume,
	.pre_reset =	usb_stor_pre_reset,
	.post_reset =	usb_stor_post_reset,
	.id_table =	isd200_usb_ids,
	.soft_unbind =	1,
};

static int __init isd200_init(void)
{
	return usb_register(&isd200_driver);
}

static void __exit isd200_exit(void)
{
	usb_deregister(&isd200_driver);
}

module_init(isd200_init);
module_exit(isd200_exit);