summaryrefslogtreecommitdiff
path: root/common/usb_storage.c
blob: 946c6b2b323ab62747c82e5d31b5f6b43d62b6ba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
// SPDX-License-Identifier: GPL-2.0+
/*
 * Most of this source has been derived from the Linux USB
 * project:
 *   (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
 *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
 *   (c) 1999 Michael Gee (michael@linuxspecific.com)
 *   (c) 2000 Yggdrasil Computing, Inc.
 *
 *
 * Adapted for U-Boot:
 *   (C) Copyright 2001 Denis Peter, MPL AG Switzerland
 * Driver model conversion:
 *   (C) Copyright 2015 Google, Inc
 *
 * For BBB support (C) Copyright 2003
 * Gary Jennejohn, DENX Software Engineering <garyj@denx.de>
 *
 * BBB support based on /sys/dev/usb/umass.c from
 * FreeBSD.
 */

/* Note:
 * Currently only the CBI transport protocoll has been implemented, and it
 * is only tested with a TEAC USB Floppy. Other Massstorages with CBI or CB
 * transport protocoll may work as well.
 */
/*
 * New Note:
 * Support for USB Mass Storage Devices (BBB) has been added. It has
 * only been tested with USB memory sticks.
 */


#include <common.h>
#include <blk.h>
#include <command.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <mapmem.h>
#include <memalign.h>
#include <asm/byteorder.h>
#include <asm/cache.h>
#include <asm/processor.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <linux/delay.h>

#include <part.h>
#include <usb.h>

#undef BBB_COMDAT_TRACE
#undef BBB_XPORT_TRACE

#include <scsi.h>
/* direction table -- this indicates the direction of the data
 * transfer for each command code -- a 1 indicates input
 */
static const unsigned char us_direction[256/8] = {
	0x28, 0x81, 0x14, 0x14, 0x20, 0x01, 0x90, 0x77,
	0x0C, 0x20, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
#define US_DIRECTION(x) ((us_direction[x>>3] >> (x & 7)) & 1)

static struct scsi_cmd usb_ccb __aligned(ARCH_DMA_MINALIGN);
static __u32 CBWTag;

static int usb_max_devs; /* number of highest available usb device */

#if !CONFIG_IS_ENABLED(BLK)
static struct blk_desc usb_dev_desc[USB_MAX_STOR_DEV];
#endif

struct us_data;
typedef int (*trans_cmnd)(struct scsi_cmd *cb, struct us_data *data);
typedef int (*trans_reset)(struct us_data *data);

struct us_data {
	struct usb_device *pusb_dev;	 /* this usb_device */

	unsigned int	flags;			/* from filter initially */
#	define USB_READY	(1 << 0)
	unsigned char	ifnum;			/* interface number */
	unsigned char	ep_in;			/* in endpoint */
	unsigned char	ep_out;			/* out ....... */
	unsigned char	ep_int;			/* interrupt . */
	unsigned char	subclass;		/* as in overview */
	unsigned char	protocol;		/* .............. */
	unsigned char	attention_done;		/* force attn on first cmd */
	unsigned short	ip_data;		/* interrupt data */
	int		action;			/* what to do */
	int		ip_wanted;		/* needed */
	int		*irq_handle;		/* for USB int requests */
	unsigned int	irqpipe;	 	/* pipe for release_irq */
	unsigned char	irqmaxp;		/* max packed for irq Pipe */
	unsigned char	irqinterval;		/* Intervall for IRQ Pipe */
	struct scsi_cmd	*srb;			/* current srb */
	trans_reset	transport_reset;	/* reset routine */
	trans_cmnd	transport;		/* transport routine */
	unsigned short	max_xfer_blk;		/* maximum transfer blocks */
};

#if !CONFIG_IS_ENABLED(BLK)
static struct us_data usb_stor[USB_MAX_STOR_DEV];
#endif

#define USB_STOR_TRANSPORT_GOOD	   0
#define USB_STOR_TRANSPORT_FAILED -1
#define USB_STOR_TRANSPORT_ERROR  -2

int usb_stor_get_info(struct usb_device *dev, struct us_data *us,
		      struct blk_desc *dev_desc);
int usb_storage_probe(struct usb_device *dev, unsigned int ifnum,
		      struct us_data *ss);
#if CONFIG_IS_ENABLED(BLK)
static unsigned long usb_stor_read(struct udevice *dev, lbaint_t blknr,
				   lbaint_t blkcnt, void *buffer);
static unsigned long usb_stor_write(struct udevice *dev, lbaint_t blknr,
				    lbaint_t blkcnt, const void *buffer);
#else
static unsigned long usb_stor_read(struct blk_desc *block_dev, lbaint_t blknr,
				   lbaint_t blkcnt, void *buffer);
static unsigned long usb_stor_write(struct blk_desc *block_dev, lbaint_t blknr,
				    lbaint_t blkcnt, const void *buffer);
#endif
void uhci_show_temp_int_td(void);

static void usb_show_progress(void)
{
	debug(".");
}

/*******************************************************************************
 * show info on storage devices; 'usb start/init' must be invoked earlier
 * as we only retrieve structures populated during devices initialization
 */
int usb_stor_info(void)
{
	int count = 0;
#if CONFIG_IS_ENABLED(BLK)
	struct udevice *dev;

	for (blk_first_device(IF_TYPE_USB, &dev);
	     dev;
	     blk_next_device(&dev)) {
		struct blk_desc *desc = dev_get_uclass_plat(dev);

		printf("  Device %d: ", desc->devnum);
		dev_print(desc);
		count++;
	}
#else
	int i;

	if (usb_max_devs > 0) {
		for (i = 0; i < usb_max_devs; i++) {
			printf("  Device %d: ", i);
			dev_print(&usb_dev_desc[i]);
		}
		return 0;
	}
#endif
	if (!count) {
		printf("No storage devices, perhaps not 'usb start'ed..?\n");
		return 1;
	}

	return 0;
}

static unsigned int usb_get_max_lun(struct us_data *us)
{
	int len;
	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, result, 1);
	len = usb_control_msg(us->pusb_dev,
			      usb_rcvctrlpipe(us->pusb_dev, 0),
			      US_BBB_GET_MAX_LUN,
			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
			      0, us->ifnum,
			      result, sizeof(char),
			      USB_CNTL_TIMEOUT * 5);
	debug("Get Max LUN -> len = %i, result = %i\n", len, (int) *result);
	return (len > 0) ? *result : 0;
}

static int usb_stor_probe_device(struct usb_device *udev)
{
	int lun, max_lun;

#if CONFIG_IS_ENABLED(BLK)
	struct us_data *data;
	int ret;
#else
	int start;

	if (udev == NULL)
		return -ENOENT; /* no more devices available */
#endif

	debug("\n\nProbing for storage\n");
#if CONFIG_IS_ENABLED(BLK)
	/*
	 * We store the us_data in the mass storage device's plat. It
	 * is shared by all LUNs (block devices) attached to this mass storage
	 * device.
	 */
	data = dev_get_plat(udev->dev);
	if (!usb_storage_probe(udev, 0, data))
		return 0;
	max_lun = usb_get_max_lun(data);
	for (lun = 0; lun <= max_lun; lun++) {
		struct blk_desc *blkdev;
		struct udevice *dev;
		char str[10];

		snprintf(str, sizeof(str), "lun%d", lun);
		ret = blk_create_devicef(udev->dev, "usb_storage_blk", str,
					 IF_TYPE_USB, usb_max_devs, 512, 0,
					 &dev);
		if (ret) {
			debug("Cannot bind driver\n");
			return ret;
		}

		blkdev = dev_get_uclass_plat(dev);
		blkdev->target = 0xff;
		blkdev->lun = lun;

		ret = usb_stor_get_info(udev, data, blkdev);
		if (ret == 1) {
			usb_max_devs++;
			debug("%s: Found device %p\n", __func__, udev);
		} else {
			debug("usb_stor_get_info: Invalid device\n");
			ret = device_unbind(dev);
			if (ret)
				return ret;
		}
	}
#else
	/* We don't have space to even probe if we hit the maximum */
	if (usb_max_devs == USB_MAX_STOR_DEV) {
		printf("max USB Storage Device reached: %d stopping\n",
		       usb_max_devs);
		return -ENOSPC;
	}

	if (!usb_storage_probe(udev, 0, &usb_stor[usb_max_devs]))
		return 0;

	/*
	 * OK, it's a storage device.  Iterate over its LUNs and populate
	 * usb_dev_desc'
	 */
	start = usb_max_devs;

	max_lun = usb_get_max_lun(&usb_stor[usb_max_devs]);
	for (lun = 0; lun <= max_lun && usb_max_devs < USB_MAX_STOR_DEV;
	     lun++) {
		struct blk_desc *blkdev;

		blkdev = &usb_dev_desc[usb_max_devs];
		memset(blkdev, '\0', sizeof(struct blk_desc));
		blkdev->if_type = IF_TYPE_USB;
		blkdev->devnum = usb_max_devs;
		blkdev->part_type = PART_TYPE_UNKNOWN;
		blkdev->target = 0xff;
		blkdev->type = DEV_TYPE_UNKNOWN;
		blkdev->block_read = usb_stor_read;
		blkdev->block_write = usb_stor_write;
		blkdev->lun = lun;
		blkdev->priv = udev;

		if (usb_stor_get_info(udev, &usb_stor[start],
				      &usb_dev_desc[usb_max_devs]) == 1) {
			debug("partype: %d\n", blkdev->part_type);
			part_init(blkdev);
			debug("partype: %d\n", blkdev->part_type);
			usb_max_devs++;
			debug("%s: Found device %p\n", __func__, udev);
		}
	}
#endif

	return 0;
}

void usb_stor_reset(void)
{
	usb_max_devs = 0;
}

/*******************************************************************************
 * scan the usb and reports device info
 * to the user if mode = 1
 * returns current device or -1 if no
 */
int usb_stor_scan(int mode)
{
	if (mode == 1)
		printf("       scanning usb for storage devices... ");

#if !CONFIG_IS_ENABLED(DM_USB)
	unsigned char i;

	usb_disable_asynch(1); /* asynch transfer not allowed */

	usb_stor_reset();
	for (i = 0; i < USB_MAX_DEVICE; i++) {
		struct usb_device *dev;

		dev = usb_get_dev_index(i); /* get device */
		debug("i=%d\n", i);
		if (usb_stor_probe_device(dev))
			break;
	} /* for */

	usb_disable_asynch(0); /* asynch transfer allowed */
#endif
	printf("%d Storage Device(s) found\n", usb_max_devs);
	if (usb_max_devs > 0)
		return 0;
	return -1;
}

static int usb_stor_irq(struct usb_device *dev)
{
	struct us_data *us;
	us = (struct us_data *)dev->privptr;

	if (us->ip_wanted)
		us->ip_wanted = 0;
	return 0;
}


#ifdef	DEBUG

static void usb_show_srb(struct scsi_cmd *pccb)
{
	int i;
	printf("SRB: len %d datalen 0x%lX\n ", pccb->cmdlen, pccb->datalen);
	for (i = 0; i < 12; i++)
		printf("%02X ", pccb->cmd[i]);
	printf("\n");
}

static void display_int_status(unsigned long tmp)
{
	printf("Status: %s %s %s %s %s %s %s\n",
		(tmp & USB_ST_ACTIVE) ? "Active" : "",
		(tmp & USB_ST_STALLED) ? "Stalled" : "",
		(tmp & USB_ST_BUF_ERR) ? "Buffer Error" : "",
		(tmp & USB_ST_BABBLE_DET) ? "Babble Det" : "",
		(tmp & USB_ST_NAK_REC) ? "NAKed" : "",
		(tmp & USB_ST_CRC_ERR) ? "CRC Error" : "",
		(tmp & USB_ST_BIT_ERR) ? "Bitstuff Error" : "");
}
#endif
/***********************************************************************
 * Data transfer routines
 ***********************************************************************/

static int us_one_transfer(struct us_data *us, int pipe, char *buf, int length)
{
	int max_size;
	int this_xfer;
	int result;
	int partial;
	int maxtry;
	int stat;

	/* determine the maximum packet size for these transfers */
	max_size = usb_maxpacket(us->pusb_dev, pipe) * 16;

	/* while we have data left to transfer */
	while (length) {

		/* calculate how long this will be -- maximum or a remainder */
		this_xfer = length > max_size ? max_size : length;
		length -= this_xfer;

		/* setup the retry counter */
		maxtry = 10;

		/* set up the transfer loop */
		do {
			/* transfer the data */
			debug("Bulk xfer 0x%lx(%d) try #%d\n",
			      (ulong)map_to_sysmem(buf), this_xfer,
			      11 - maxtry);
			result = usb_bulk_msg(us->pusb_dev, pipe, buf,
					      this_xfer, &partial,
					      USB_CNTL_TIMEOUT * 5);
			debug("bulk_msg returned %d xferred %d/%d\n",
			      result, partial, this_xfer);
			if (us->pusb_dev->status != 0) {
				/* if we stall, we need to clear it before
				 * we go on
				 */
#ifdef DEBUG
				display_int_status(us->pusb_dev->status);
#endif
				if (us->pusb_dev->status & USB_ST_STALLED) {
					debug("stalled ->clearing endpoint" \
					      "halt for pipe 0x%x\n", pipe);
					stat = us->pusb_dev->status;
					usb_clear_halt(us->pusb_dev, pipe);
					us->pusb_dev->status = stat;
					if (this_xfer == partial) {
						debug("bulk transferred" \
						      "with error %lX," \
						      " but data ok\n",
						      us->pusb_dev->status);
						return 0;
					}
					else
						return result;
				}
				if (us->pusb_dev->status & USB_ST_NAK_REC) {
					debug("Device NAKed bulk_msg\n");
					return result;
				}
				debug("bulk transferred with error");
				if (this_xfer == partial) {
					debug(" %ld, but data ok\n",
					      us->pusb_dev->status);
					return 0;
				}
				/* if our try counter reaches 0, bail out */
				debug(" %ld, data %d\n",
				      us->pusb_dev->status, partial);
				if (!maxtry--)
						return result;
			}
			/* update to show what data was transferred */
			this_xfer -= partial;
			buf += partial;
			/* continue until this transfer is done */
		} while (this_xfer);
	}

	/* if we get here, we're done and successful */
	return 0;
}

static int usb_stor_BBB_reset(struct us_data *us)
{
	int result;
	unsigned int pipe;

	/*
	 * Reset recovery (5.3.4 in Universal Serial Bus Mass Storage Class)
	 *
	 * For Reset Recovery the host shall issue in the following order:
	 * a) a Bulk-Only Mass Storage Reset
	 * b) a Clear Feature HALT to the Bulk-In endpoint
	 * c) a Clear Feature HALT to the Bulk-Out endpoint
	 *
	 * This is done in 3 steps.
	 *
	 * If the reset doesn't succeed, the device should be port reset.
	 *
	 * This comment stolen from FreeBSD's /sys/dev/usb/umass.c.
	 */
	debug("BBB_reset\n");
	result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev, 0),
				 US_BBB_RESET,
				 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
				 0, us->ifnum, NULL, 0, USB_CNTL_TIMEOUT * 5);

	if ((result < 0) && (us->pusb_dev->status & USB_ST_STALLED)) {
		debug("RESET:stall\n");
		return -1;
	}

	/* long wait for reset */
	mdelay(150);
	debug("BBB_reset result %d: status %lX reset\n",
	      result, us->pusb_dev->status);
	pipe = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
	result = usb_clear_halt(us->pusb_dev, pipe);
	/* long wait for reset */
	mdelay(150);
	debug("BBB_reset result %d: status %lX clearing IN endpoint\n",
	      result, us->pusb_dev->status);
	/* long wait for reset */
	pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
	result = usb_clear_halt(us->pusb_dev, pipe);
	mdelay(150);
	debug("BBB_reset result %d: status %lX clearing OUT endpoint\n",
	      result, us->pusb_dev->status);
	debug("BBB_reset done\n");
	return 0;
}

/* FIXME: this reset function doesn't really reset the port, and it
 * should. Actually it should probably do what it's doing here, and
 * reset the port physically
 */
static int usb_stor_CB_reset(struct us_data *us)
{
	unsigned char cmd[12];
	int result;

	debug("CB_reset\n");
	memset(cmd, 0xff, sizeof(cmd));
	cmd[0] = SCSI_SEND_DIAG;
	cmd[1] = 4;
	result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev, 0),
				 US_CBI_ADSC,
				 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
				 0, us->ifnum, cmd, sizeof(cmd),
				 USB_CNTL_TIMEOUT * 5);

	/* long wait for reset */
	mdelay(1500);
	debug("CB_reset result %d: status %lX clearing endpoint halt\n",
	      result, us->pusb_dev->status);
	usb_clear_halt(us->pusb_dev, usb_rcvbulkpipe(us->pusb_dev, us->ep_in));
	usb_clear_halt(us->pusb_dev, usb_rcvbulkpipe(us->pusb_dev, us->ep_out));

	debug("CB_reset done\n");
	return 0;
}

/*
 * Set up the command for a BBB device. Note that the actual SCSI
 * command is copied into cbw.CBWCDB.
 */
static int usb_stor_BBB_comdat(struct scsi_cmd *srb, struct us_data *us)
{
	int result;
	int actlen;
	int dir_in;
	unsigned int pipe;
	ALLOC_CACHE_ALIGN_BUFFER(struct umass_bbb_cbw, cbw, 1);

	dir_in = US_DIRECTION(srb->cmd[0]);

#ifdef BBB_COMDAT_TRACE
	printf("dir %d lun %d cmdlen %d cmd %p datalen %lu pdata %p\n",
		dir_in, srb->lun, srb->cmdlen, srb->cmd, srb->datalen,
		srb->pdata);
	if (srb->cmdlen) {
		for (result = 0; result < srb->cmdlen; result++)
			printf("cmd[%d] %#x ", result, srb->cmd[result]);
		printf("\n");
	}
#endif
	/* sanity checks */
	if (!(srb->cmdlen <= CBWCDBLENGTH)) {
		debug("usb_stor_BBB_comdat:cmdlen too large\n");
		return -1;
	}

	/* always OUT to the ep */
	pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);

	cbw->dCBWSignature = cpu_to_le32(CBWSIGNATURE);
	cbw->dCBWTag = cpu_to_le32(CBWTag++);
	cbw->dCBWDataTransferLength = cpu_to_le32(srb->datalen);
	cbw->bCBWFlags = (dir_in ? CBWFLAGS_IN : CBWFLAGS_OUT);
	cbw->bCBWLUN = srb->lun;
	cbw->bCDBLength = srb->cmdlen;
	/* copy the command data into the CBW command data buffer */
	/* DST SRC LEN!!! */

	memcpy(cbw->CBWCDB, srb->cmd, srb->cmdlen);
	result = usb_bulk_msg(us->pusb_dev, pipe, cbw, UMASS_BBB_CBW_SIZE,
			      &actlen, USB_CNTL_TIMEOUT * 5);
	if (result < 0)
		debug("usb_stor_BBB_comdat:usb_bulk_msg error\n");
	return result;
}

/* FIXME: we also need a CBI_command which sets up the completion
 * interrupt, and waits for it
 */
static int usb_stor_CB_comdat(struct scsi_cmd *srb, struct us_data *us)
{
	int result = 0;
	int dir_in, retry;
	unsigned int pipe;
	unsigned long status;

	retry = 5;
	dir_in = US_DIRECTION(srb->cmd[0]);

	if (dir_in)
		pipe = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
	else
		pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);

	while (retry--) {
		debug("CBI gets a command: Try %d\n", 5 - retry);
#ifdef DEBUG
		usb_show_srb(srb);
#endif
		/* let's send the command via the control pipe */
		result = usb_control_msg(us->pusb_dev,
					 usb_sndctrlpipe(us->pusb_dev , 0),
					 US_CBI_ADSC,
					 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
					 0, us->ifnum,
					 srb->cmd, srb->cmdlen,
					 USB_CNTL_TIMEOUT * 5);
		debug("CB_transport: control msg returned %d, status %lX\n",
		      result, us->pusb_dev->status);
		/* check the return code for the command */
		if (result < 0) {
			if (us->pusb_dev->status & USB_ST_STALLED) {
				status = us->pusb_dev->status;
				debug(" stall during command found," \
				      " clear pipe\n");
				usb_clear_halt(us->pusb_dev,
					      usb_sndctrlpipe(us->pusb_dev, 0));
				us->pusb_dev->status = status;
			}
			debug(" error during command %02X" \
			      " Stat = %lX\n", srb->cmd[0],
			      us->pusb_dev->status);
			return result;
		}
		/* transfer the data payload for this command, if one exists*/

		debug("CB_transport: control msg returned %d," \
		      " direction is %s to go 0x%lx\n", result,
		      dir_in ? "IN" : "OUT", srb->datalen);
		if (srb->datalen) {
			result = us_one_transfer(us, pipe, (char *)srb->pdata,
						 srb->datalen);
			debug("CBI attempted to transfer data," \
			      " result is %d status %lX, len %d\n",
			      result, us->pusb_dev->status,
				us->pusb_dev->act_len);
			if (!(us->pusb_dev->status & USB_ST_NAK_REC))
				break;
		} /* if (srb->datalen) */
		else
			break;
	}
	/* return result */

	return result;
}


static int usb_stor_CBI_get_status(struct scsi_cmd *srb, struct us_data *us)
{
	int timeout;

	us->ip_wanted = 1;
	usb_int_msg(us->pusb_dev, us->irqpipe,
		    (void *)&us->ip_data, us->irqmaxp, us->irqinterval, false);
	timeout = 1000;
	while (timeout--) {
		if (us->ip_wanted == 0)
			break;
		mdelay(10);
	}
	if (us->ip_wanted) {
		printf("	Did not get interrupt on CBI\n");
		us->ip_wanted = 0;
		return USB_STOR_TRANSPORT_ERROR;
	}
	debug("Got interrupt data 0x%x, transferred %d status 0x%lX\n",
	      us->ip_data, us->pusb_dev->irq_act_len,
	      us->pusb_dev->irq_status);
	/* UFI gives us ASC and ASCQ, like a request sense */
	if (us->subclass == US_SC_UFI) {
		if (srb->cmd[0] == SCSI_REQ_SENSE ||
		    srb->cmd[0] == SCSI_INQUIRY)
			return USB_STOR_TRANSPORT_GOOD; /* Good */
		else if (us->ip_data)
			return USB_STOR_TRANSPORT_FAILED;
		else
			return USB_STOR_TRANSPORT_GOOD;
	}
	/* otherwise, we interpret the data normally */
	switch (us->ip_data) {
	case 0x0001:
		return USB_STOR_TRANSPORT_GOOD;
	case 0x0002:
		return USB_STOR_TRANSPORT_FAILED;
	default:
		return USB_STOR_TRANSPORT_ERROR;
	}			/* switch */
	return USB_STOR_TRANSPORT_ERROR;
}

#define USB_TRANSPORT_UNKNOWN_RETRY 5
#define USB_TRANSPORT_NOT_READY_RETRY 10

/* clear a stall on an endpoint - special for BBB devices */
static int usb_stor_BBB_clear_endpt_stall(struct us_data *us, __u8 endpt)
{
	/* ENDPOINT_HALT = 0, so set value to 0 */
	return usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev, 0),
			       USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 0,
			       endpt, NULL, 0, USB_CNTL_TIMEOUT * 5);
}

static int usb_stor_BBB_transport(struct scsi_cmd *srb, struct us_data *us)
{
	int result, retry;
	int dir_in;
	int actlen, data_actlen;
	unsigned int pipe, pipein, pipeout;
	ALLOC_CACHE_ALIGN_BUFFER(struct umass_bbb_csw, csw, 1);
#ifdef BBB_XPORT_TRACE
	unsigned char *ptr;
	int index;
#endif

	dir_in = US_DIRECTION(srb->cmd[0]);

	/* COMMAND phase */
	debug("COMMAND phase\n");
	result = usb_stor_BBB_comdat(srb, us);
	if (result < 0) {
		debug("failed to send CBW status %ld\n",
		      us->pusb_dev->status);
		usb_stor_BBB_reset(us);
		return USB_STOR_TRANSPORT_FAILED;
	}
	if (!(us->flags & USB_READY))
		mdelay(5);
	pipein = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
	pipeout = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
	/* DATA phase + error handling */
	data_actlen = 0;
	/* no data, go immediately to the STATUS phase */
	if (srb->datalen == 0)
		goto st;
	debug("DATA phase\n");
	if (dir_in)
		pipe = pipein;
	else
		pipe = pipeout;

	result = usb_bulk_msg(us->pusb_dev, pipe, srb->pdata, srb->datalen,
			      &data_actlen, USB_CNTL_TIMEOUT * 5);
	/* special handling of STALL in DATA phase */
	if ((result < 0) && (us->pusb_dev->status & USB_ST_STALLED)) {
		debug("DATA:stall\n");
		/* clear the STALL on the endpoint */
		result = usb_stor_BBB_clear_endpt_stall(us,
					dir_in ? us->ep_in : us->ep_out);
		if (result >= 0)
			/* continue on to STATUS phase */
			goto st;
	}
	if (result < 0) {
		debug("usb_bulk_msg error status %ld\n",
		      us->pusb_dev->status);
		usb_stor_BBB_reset(us);
		return USB_STOR_TRANSPORT_FAILED;
	}
#ifdef BBB_XPORT_TRACE
	for (index = 0; index < data_actlen; index++)
		printf("pdata[%d] %#x ", index, srb->pdata[index]);
	printf("\n");
#endif
	/* STATUS phase + error handling */
st:
	retry = 0;
again:
	debug("STATUS phase\n");
	result = usb_bulk_msg(us->pusb_dev, pipein, csw, UMASS_BBB_CSW_SIZE,
				&actlen, USB_CNTL_TIMEOUT*5);

	/* special handling of STALL in STATUS phase */
	if ((result < 0) && (retry < 1) &&
	    (us->pusb_dev->status & USB_ST_STALLED)) {
		debug("STATUS:stall\n");
		/* clear the STALL on the endpoint */
		result = usb_stor_BBB_clear_endpt_stall(us, us->ep_in);
		if (result >= 0 && (retry++ < 1))
			/* do a retry */
			goto again;
	}
	if (result < 0) {
		debug("usb_bulk_msg error status %ld\n",
		      us->pusb_dev->status);
		usb_stor_BBB_reset(us);
		return USB_STOR_TRANSPORT_FAILED;
	}
#ifdef BBB_XPORT_TRACE
	ptr = (unsigned char *)csw;
	for (index = 0; index < UMASS_BBB_CSW_SIZE; index++)
		printf("ptr[%d] %#x ", index, ptr[index]);
	printf("\n");
#endif
	/* misuse pipe to get the residue */
	pipe = le32_to_cpu(csw->dCSWDataResidue);
	if (pipe == 0 && srb->datalen != 0 && srb->datalen - data_actlen != 0)
		pipe = srb->datalen - data_actlen;
	if (CSWSIGNATURE != le32_to_cpu(csw->dCSWSignature)) {
		debug("!CSWSIGNATURE\n");
		usb_stor_BBB_reset(us);
		return USB_STOR_TRANSPORT_FAILED;
	} else if ((CBWTag - 1) != le32_to_cpu(csw->dCSWTag)) {
		debug("!Tag\n");
		usb_stor_BBB_reset(us);
		return USB_STOR_TRANSPORT_FAILED;
	} else if (csw->bCSWStatus > CSWSTATUS_PHASE) {
		debug(">PHASE\n");
		usb_stor_BBB_reset(us);
		return USB_STOR_TRANSPORT_FAILED;
	} else if (csw->bCSWStatus == CSWSTATUS_PHASE) {
		debug("=PHASE\n");
		usb_stor_BBB_reset(us);
		return USB_STOR_TRANSPORT_FAILED;
	} else if (data_actlen > srb->datalen) {
		debug("transferred %dB instead of %ldB\n",
		      data_actlen, srb->datalen);
		return USB_STOR_TRANSPORT_FAILED;
	} else if (csw->bCSWStatus == CSWSTATUS_FAILED) {
		debug("FAILED\n");
		return USB_STOR_TRANSPORT_FAILED;
	}

	return result;
}

static int usb_stor_CB_transport(struct scsi_cmd *srb, struct us_data *us)
{
	int result, status;
	struct scsi_cmd *psrb;
	struct scsi_cmd reqsrb;
	int retry, notready;

	psrb = &reqsrb;
	status = USB_STOR_TRANSPORT_GOOD;
	retry = 0;
	notready = 0;
	/* issue the command */
do_retry:
	result = usb_stor_CB_comdat(srb, us);
	debug("command / Data returned %d, status %lX\n",
	      result, us->pusb_dev->status);
	/* if this is an CBI Protocol, get IRQ */
	if (us->protocol == US_PR_CBI) {
		status = usb_stor_CBI_get_status(srb, us);
		/* if the status is error, report it */
		if (status == USB_STOR_TRANSPORT_ERROR) {
			debug(" USB CBI Command Error\n");
			return status;
		}
		srb->sense_buf[12] = (unsigned char)(us->ip_data >> 8);
		srb->sense_buf[13] = (unsigned char)(us->ip_data & 0xff);
		if (!us->ip_data) {
			/* if the status is good, report it */
			if (status == USB_STOR_TRANSPORT_GOOD) {
				debug(" USB CBI Command Good\n");
				return status;
			}
		}
	}
	/* do we have to issue an auto request? */
	/* HERE we have to check the result */
	if ((result < 0) && !(us->pusb_dev->status & USB_ST_STALLED)) {
		debug("ERROR %lX\n", us->pusb_dev->status);
		us->transport_reset(us);
		return USB_STOR_TRANSPORT_ERROR;
	}
	if ((us->protocol == US_PR_CBI) &&
	    ((srb->cmd[0] == SCSI_REQ_SENSE) ||
	    (srb->cmd[0] == SCSI_INQUIRY))) {
		/* do not issue an autorequest after request sense */
		debug("No auto request and good\n");
		return USB_STOR_TRANSPORT_GOOD;
	}
	/* issue an request_sense */
	memset(&psrb->cmd[0], 0, 12);
	psrb->cmd[0] = SCSI_REQ_SENSE;
	psrb->cmd[1] = srb->lun << 5;
	psrb->cmd[4] = 18;
	psrb->datalen = 18;
	psrb->pdata = &srb->sense_buf[0];
	psrb->cmdlen = 12;
	/* issue the command */
	result = usb_stor_CB_comdat(psrb, us);
	debug("auto request returned %d\n", result);
	/* if this is an CBI Protocol, get IRQ */
	if (us->protocol == US_PR_CBI)
		status = usb_stor_CBI_get_status(psrb, us);

	if ((result < 0) && !(us->pusb_dev->status & USB_ST_STALLED)) {
		debug(" AUTO REQUEST ERROR %ld\n",
		      us->pusb_dev->status);
		return USB_STOR_TRANSPORT_ERROR;
	}
	debug("autorequest returned 0x%02X 0x%02X 0x%02X 0x%02X\n",
	      srb->sense_buf[0], srb->sense_buf[2],
	      srb->sense_buf[12], srb->sense_buf[13]);
	/* Check the auto request result */
	if ((srb->sense_buf[2] == 0) &&
	    (srb->sense_buf[12] == 0) &&
	    (srb->sense_buf[13] == 0)) {
		/* ok, no sense */
		return USB_STOR_TRANSPORT_GOOD;
	}

	/* Check the auto request result */
	switch (srb->sense_buf[2]) {
	case 0x01:
		/* Recovered Error */
		return USB_STOR_TRANSPORT_GOOD;
		break;
	case 0x02:
		/* Not Ready */
		if (notready++ > USB_TRANSPORT_NOT_READY_RETRY) {
			printf("cmd 0x%02X returned 0x%02X 0x%02X 0x%02X"
			       " 0x%02X (NOT READY)\n", srb->cmd[0],
				srb->sense_buf[0], srb->sense_buf[2],
				srb->sense_buf[12], srb->sense_buf[13]);
			return USB_STOR_TRANSPORT_FAILED;
		} else {
			mdelay(100);
			goto do_retry;
		}
		break;
	default:
		if (retry++ > USB_TRANSPORT_UNKNOWN_RETRY) {
			printf("cmd 0x%02X returned 0x%02X 0x%02X 0x%02X"
			       " 0x%02X\n", srb->cmd[0], srb->sense_buf[0],
				srb->sense_buf[2], srb->sense_buf[12],
				srb->sense_buf[13]);
			return USB_STOR_TRANSPORT_FAILED;
		} else
			goto do_retry;
		break;
	}
	return USB_STOR_TRANSPORT_FAILED;
}

static void usb_stor_set_max_xfer_blk(struct usb_device *udev,
				      struct us_data *us)
{
	/*
	 * Limit the total size of a transfer to 120 KB.
	 *
	 * Some devices are known to choke with anything larger. It seems like
	 * the problem stems from the fact that original IDE controllers had
	 * only an 8-bit register to hold the number of sectors in one transfer
	 * and even those couldn't handle a full 256 sectors.
	 *
	 * Because we want to make sure we interoperate with as many devices as
	 * possible, we will maintain a 240 sector transfer size limit for USB
	 * Mass Storage devices.
	 *
	 * Tests show that other operating have similar limits with Microsoft
	 * Windows 7 limiting transfers to 128 sectors for both USB2 and USB3
	 * and Apple Mac OS X 10.11 limiting transfers to 256 sectors for USB2
	 * and 2048 for USB3 devices.
	 */
	unsigned short blk = 240;

#if CONFIG_IS_ENABLED(DM_USB)
	size_t size;
	int ret;

	ret = usb_get_max_xfer_size(udev, (size_t *)&size);
	if ((ret >= 0) && (size < blk * 512))
		blk = size / 512;
#endif

	us->max_xfer_blk = blk;
}

static int usb_inquiry(struct scsi_cmd *srb, struct us_data *ss)
{
	int retry, i;
	retry = 5;
	do {
		memset(&srb->cmd[0], 0, 12);
		srb->cmd[0] = SCSI_INQUIRY;
		srb->cmd[1] = srb->lun << 5;
		srb->cmd[4] = 36;
		srb->datalen = 36;
		srb->cmdlen = 12;
		i = ss->transport(srb, ss);
		debug("inquiry returns %d\n", i);
		if (i == 0)
			break;
	} while (--retry);

	if (!retry) {
		printf("error in inquiry\n");
		return -1;
	}
	return 0;
}

static int usb_request_sense(struct scsi_cmd *srb, struct us_data *ss)
{
	char *ptr;

	ptr = (char *)srb->pdata;
	memset(&srb->cmd[0], 0, 12);
	srb->cmd[0] = SCSI_REQ_SENSE;
	srb->cmd[1] = srb->lun << 5;
	srb->cmd[4] = 18;
	srb->datalen = 18;
	srb->pdata = &srb->sense_buf[0];
	srb->cmdlen = 12;
	ss->transport(srb, ss);
	debug("Request Sense returned %02X %02X %02X\n",
	      srb->sense_buf[2], srb->sense_buf[12],
	      srb->sense_buf[13]);
	srb->pdata = (uchar *)ptr;
	return 0;
}

static int usb_test_unit_ready(struct scsi_cmd *srb, struct us_data *ss)
{
	int retries = 10;

	do {
		memset(&srb->cmd[0], 0, 12);
		srb->cmd[0] = SCSI_TST_U_RDY;
		srb->cmd[1] = srb->lun << 5;
		srb->datalen = 0;
		srb->cmdlen = 12;
		if (ss->transport(srb, ss) == USB_STOR_TRANSPORT_GOOD) {
			ss->flags |= USB_READY;
			return 0;
		}
		usb_request_sense(srb, ss);
		/*
		 * Check the Key Code Qualifier, if it matches
		 * "Not Ready - medium not present"
		 * (the sense Key equals 0x2 and the ASC is 0x3a)
		 * return immediately as the medium being absent won't change
		 * unless there is a user action.
		 */
		if ((srb->sense_buf[2] == 0x02) &&
		    (srb->sense_buf[12] == 0x3a))
			return -1;
		mdelay(100);
	} while (retries--);

	return -1;
}

static int usb_read_capacity(struct scsi_cmd *srb, struct us_data *ss)
{
	int retry;
	/* XXX retries */
	retry = 3;
	do {
		memset(&srb->cmd[0], 0, 12);
		srb->cmd[0] = SCSI_RD_CAPAC;
		srb->cmd[1] = srb->lun << 5;
		srb->datalen = 8;
		srb->cmdlen = 12;
		if (ss->transport(srb, ss) == USB_STOR_TRANSPORT_GOOD)
			return 0;
	} while (retry--);

	return -1;
}

static int usb_read_10(struct scsi_cmd *srb, struct us_data *ss,
		       unsigned long start, unsigned short blocks)
{
	memset(&srb->cmd[0], 0, 12);
	srb->cmd[0] = SCSI_READ10;
	srb->cmd[1] = srb->lun << 5;
	srb->cmd[2] = ((unsigned char) (start >> 24)) & 0xff;
	srb->cmd[3] = ((unsigned char) (start >> 16)) & 0xff;
	srb->cmd[4] = ((unsigned char) (start >> 8)) & 0xff;
	srb->cmd[5] = ((unsigned char) (start)) & 0xff;
	srb->cmd[7] = ((unsigned char) (blocks >> 8)) & 0xff;
	srb->cmd[8] = (unsigned char) blocks & 0xff;
	srb->cmdlen = 12;
	debug("read10: start %lx blocks %x\n", start, blocks);
	return ss->transport(srb, ss);
}

static int usb_write_10(struct scsi_cmd *srb, struct us_data *ss,
			unsigned long start, unsigned short blocks)
{
	memset(&srb->cmd[0], 0, 12);
	srb->cmd[0] = SCSI_WRITE10;
	srb->cmd[1] = srb->lun << 5;
	srb->cmd[2] = ((unsigned char) (start >> 24)) & 0xff;
	srb->cmd[3] = ((unsigned char) (start >> 16)) & 0xff;
	srb->cmd[4] = ((unsigned char) (start >> 8)) & 0xff;
	srb->cmd[5] = ((unsigned char) (start)) & 0xff;
	srb->cmd[7] = ((unsigned char) (blocks >> 8)) & 0xff;
	srb->cmd[8] = (unsigned char) blocks & 0xff;
	srb->cmdlen = 12;
	debug("write10: start %lx blocks %x\n", start, blocks);
	return ss->transport(srb, ss);
}


#ifdef CONFIG_USB_BIN_FIXUP
/*
 * Some USB storage devices queried for SCSI identification data respond with
 * binary strings, which if output to the console freeze the terminal. The
 * workaround is to modify the vendor and product strings read from such
 * device with proper values (as reported by 'usb info').
 *
 * Vendor and product length limits are taken from the definition of
 * struct blk_desc in include/part.h.
 */
static void usb_bin_fixup(struct usb_device_descriptor descriptor,
				unsigned char vendor[],
				unsigned char product[]) {
	const unsigned char max_vendor_len = 40;
	const unsigned char max_product_len = 20;
	if (descriptor.idVendor == 0x0424 && descriptor.idProduct == 0x223a) {
		strncpy((char *)vendor, "SMSC", max_vendor_len);
		strncpy((char *)product, "Flash Media Cntrller",
			max_product_len);
	}
}
#endif /* CONFIG_USB_BIN_FIXUP */

#if CONFIG_IS_ENABLED(BLK)
static unsigned long usb_stor_read(struct udevice *dev, lbaint_t blknr,
				   lbaint_t blkcnt, void *buffer)
#else
static unsigned long usb_stor_read(struct blk_desc *block_dev, lbaint_t blknr,
				   lbaint_t blkcnt, void *buffer)
#endif
{
	lbaint_t start, blks;
	uintptr_t buf_addr;
	unsigned short smallblks;
	struct usb_device *udev;
	struct us_data *ss;
	int retry;
	struct scsi_cmd *srb = &usb_ccb;
#if CONFIG_IS_ENABLED(BLK)
	struct blk_desc *block_dev;
#endif

	if (blkcnt == 0)
		return 0;
	/* Setup  device */
#if CONFIG_IS_ENABLED(BLK)
	block_dev = dev_get_uclass_plat(dev);
	udev = dev_get_parent_priv(dev_get_parent(dev));
	debug("\nusb_read: udev %d\n", block_dev->devnum);
#else
	debug("\nusb_read: udev %d\n", block_dev->devnum);
	udev = usb_dev_desc[block_dev->devnum].priv;
	if (!udev) {
		debug("%s: No device\n", __func__);
		return 0;
	}
#endif
	ss = (struct us_data *)udev->privptr;

	usb_disable_asynch(1); /* asynch transfer not allowed */
	usb_lock_async(udev, 1);
	srb->lun = block_dev->lun;
	buf_addr = (uintptr_t)buffer;
	start = blknr;
	blks = blkcnt;

	debug("\nusb_read: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n",
	      block_dev->devnum, start, blks, buf_addr);

	do {
		/* XXX need some comment here */
		retry = 2;
		srb->pdata = (unsigned char *)buf_addr;
		if (blks > ss->max_xfer_blk)
			smallblks = ss->max_xfer_blk;
		else
			smallblks = (unsigned short) blks;
retry_it:
		if (smallblks == ss->max_xfer_blk)
			usb_show_progress();
		srb->datalen = block_dev->blksz * smallblks;
		srb->pdata = (unsigned char *)buf_addr;
		if (usb_read_10(srb, ss, start, smallblks)) {
			debug("Read ERROR\n");
			ss->flags &= ~USB_READY;
			usb_request_sense(srb, ss);
			if (retry--)
				goto retry_it;
			blkcnt -= blks;
			break;
		}
		start += smallblks;
		blks -= smallblks;
		buf_addr += srb->datalen;
	} while (blks != 0);

	debug("usb_read: end startblk " LBAF ", blccnt %x buffer %lx\n",
	      start, smallblks, buf_addr);

	usb_lock_async(udev, 0);
	usb_disable_asynch(0); /* asynch transfer allowed */
	if (blkcnt >= ss->max_xfer_blk)
		debug("\n");
	return blkcnt;
}

#if CONFIG_IS_ENABLED(BLK)
static unsigned long usb_stor_write(struct udevice *dev, lbaint_t blknr,
				    lbaint_t blkcnt, const void *buffer)
#else
static unsigned long usb_stor_write(struct blk_desc *block_dev, lbaint_t blknr,
				    lbaint_t blkcnt, const void *buffer)
#endif
{
	lbaint_t start, blks;
	uintptr_t buf_addr;
	unsigned short smallblks;
	struct usb_device *udev;
	struct us_data *ss;
	int retry;
	struct scsi_cmd *srb = &usb_ccb;
#if CONFIG_IS_ENABLED(BLK)
	struct blk_desc *block_dev;
#endif

	if (blkcnt == 0)
		return 0;

	/* Setup  device */
#if CONFIG_IS_ENABLED(BLK)
	block_dev = dev_get_uclass_plat(dev);
	udev = dev_get_parent_priv(dev_get_parent(dev));
	debug("\nusb_read: udev %d\n", block_dev->devnum);
#else
	debug("\nusb_read: udev %d\n", block_dev->devnum);
	udev = usb_dev_desc[block_dev->devnum].priv;
	if (!udev) {
		debug("%s: No device\n", __func__);
		return 0;
	}
#endif
	ss = (struct us_data *)udev->privptr;

	usb_disable_asynch(1); /* asynch transfer not allowed */
	usb_lock_async(udev, 1);

	srb->lun = block_dev->lun;
	buf_addr = (uintptr_t)buffer;
	start = blknr;
	blks = blkcnt;

	debug("\nusb_write: dev %d startblk " LBAF ", blccnt " LBAF " buffer %lx\n",
	      block_dev->devnum, start, blks, buf_addr);

	do {
		/* If write fails retry for max retry count else
		 * return with number of blocks written successfully.
		 */
		retry = 2;
		srb->pdata = (unsigned char *)buf_addr;
		if (blks > ss->max_xfer_blk)
			smallblks = ss->max_xfer_blk;
		else
			smallblks = (unsigned short) blks;
retry_it:
		if (smallblks == ss->max_xfer_blk)
			usb_show_progress();
		srb->datalen = block_dev->blksz * smallblks;
		srb->pdata = (unsigned char *)buf_addr;
		if (usb_write_10(srb, ss, start, smallblks)) {
			debug("Write ERROR\n");
			ss->flags &= ~USB_READY;
			usb_request_sense(srb, ss);
			if (retry--)
				goto retry_it;
			blkcnt -= blks;
			break;
		}
		start += smallblks;
		blks -= smallblks;
		buf_addr += srb->datalen;
	} while (blks != 0);

	debug("usb_write: end startblk " LBAF ", blccnt %x buffer %lx\n",
	      start, smallblks, buf_addr);

	usb_lock_async(udev, 0);
	usb_disable_asynch(0); /* asynch transfer allowed */
	if (blkcnt >= ss->max_xfer_blk)
		debug("\n");
	return blkcnt;

}

/* Probe to see if a new device is actually a Storage device */
int usb_storage_probe(struct usb_device *dev, unsigned int ifnum,
		      struct us_data *ss)
{
	struct usb_interface *iface;
	int i;
	struct usb_endpoint_descriptor *ep_desc;
	unsigned int flags = 0;

	/* let's examine the device now */
	iface = &dev->config.if_desc[ifnum];

	if (dev->descriptor.bDeviceClass != 0 ||
			iface->desc.bInterfaceClass != USB_CLASS_MASS_STORAGE ||
			iface->desc.bInterfaceSubClass < US_SC_MIN ||
			iface->desc.bInterfaceSubClass > US_SC_MAX) {
		debug("Not mass storage\n");
		/* if it's not a mass storage, we go no further */
		return 0;
	}

	memset(ss, 0, sizeof(struct us_data));

	/* At this point, we know we've got a live one */
	debug("\n\nUSB Mass Storage device detected\n");

	/* Initialize the us_data structure with some useful info */
	ss->flags = flags;
	ss->ifnum = ifnum;
	ss->pusb_dev = dev;
	ss->attention_done = 0;
	ss->subclass = iface->desc.bInterfaceSubClass;
	ss->protocol = iface->desc.bInterfaceProtocol;

	/* set the handler pointers based on the protocol */
	debug("Transport: ");
	switch (ss->protocol) {
	case US_PR_CB:
		debug("Control/Bulk\n");
		ss->transport = usb_stor_CB_transport;
		ss->transport_reset = usb_stor_CB_reset;
		break;

	case US_PR_CBI:
		debug("Control/Bulk/Interrupt\n");
		ss->transport = usb_stor_CB_transport;
		ss->transport_reset = usb_stor_CB_reset;
		break;
	case US_PR_BULK:
		debug("Bulk/Bulk/Bulk\n");
		ss->transport = usb_stor_BBB_transport;
		ss->transport_reset = usb_stor_BBB_reset;
		break;
	default:
		printf("USB Storage Transport unknown / not yet implemented\n");
		return 0;
		break;
	}

	/*
	 * We are expecting a minimum of 2 endpoints - in and out (bulk).
	 * An optional interrupt is OK (necessary for CBI protocol).
	 * We will ignore any others.
	 */
	for (i = 0; i < iface->desc.bNumEndpoints; i++) {
		ep_desc = &iface->ep_desc[i];
		/* is it an BULK endpoint? */
		if ((ep_desc->bmAttributes &
		     USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK) {
			if (ep_desc->bEndpointAddress & USB_DIR_IN)
				ss->ep_in = ep_desc->bEndpointAddress &
						USB_ENDPOINT_NUMBER_MASK;
			else
				ss->ep_out =
					ep_desc->bEndpointAddress &
					USB_ENDPOINT_NUMBER_MASK;
		}

		/* is it an interrupt endpoint? */
		if ((ep_desc->bmAttributes &
		     USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT) {
			ss->ep_int = ep_desc->bEndpointAddress &
						USB_ENDPOINT_NUMBER_MASK;
			ss->irqinterval = ep_desc->bInterval;
		}
	}
	debug("Endpoints In %d Out %d Int %d\n",
	      ss->ep_in, ss->ep_out, ss->ep_int);

	/* Do some basic sanity checks, and bail if we find a problem */
	if (usb_set_interface(dev, iface->desc.bInterfaceNumber, 0) ||
	    !ss->ep_in || !ss->ep_out ||
	    (ss->protocol == US_PR_CBI && ss->ep_int == 0)) {
		debug("Problems with device\n");
		return 0;
	}
	/* set class specific stuff */
	/* We only handle certain protocols.  Currently, these are
	 * the only ones.
	 * The SFF8070 accepts the requests used in u-boot
	 */
	if (ss->subclass != US_SC_UFI && ss->subclass != US_SC_SCSI &&
	    ss->subclass != US_SC_8070) {
		printf("Sorry, protocol %d not yet supported.\n", ss->subclass);
		return 0;
	}
	if (ss->ep_int) {
		/* we had found an interrupt endpoint, prepare irq pipe
		 * set up the IRQ pipe and handler
		 */
		ss->irqinterval = (ss->irqinterval > 0) ? ss->irqinterval : 255;
		ss->irqpipe = usb_rcvintpipe(ss->pusb_dev, ss->ep_int);
		ss->irqmaxp = usb_maxpacket(dev, ss->irqpipe);
		dev->irq_handle = usb_stor_irq;
	}

	/* Set the maximum transfer size per host controller setting */
	usb_stor_set_max_xfer_blk(dev, ss);

	dev->privptr = (void *)ss;
	return 1;
}

int usb_stor_get_info(struct usb_device *dev, struct us_data *ss,
		      struct blk_desc *dev_desc)
{
	unsigned char perq, modi;
	ALLOC_CACHE_ALIGN_BUFFER(u32, cap, 2);
	ALLOC_CACHE_ALIGN_BUFFER(u8, usb_stor_buf, 36);
	u32 capacity, blksz;
	struct scsi_cmd *pccb = &usb_ccb;

	pccb->pdata = usb_stor_buf;

	dev_desc->target = dev->devnum;
	pccb->lun = dev_desc->lun;
	debug(" address %d\n", dev_desc->target);

	if (usb_inquiry(pccb, ss)) {
		debug("%s: usb_inquiry() failed\n", __func__);
		return -1;
	}

	perq = usb_stor_buf[0];
	modi = usb_stor_buf[1];

	/*
	 * Skip unknown devices (0x1f) and enclosure service devices (0x0d),
	 * they would not respond to test_unit_ready .
	 */
	if (((perq & 0x1f) == 0x1f) || ((perq & 0x1f) == 0x0d)) {
		debug("%s: unknown/unsupported device\n", __func__);
		return 0;
	}
	if ((modi&0x80) == 0x80) {
		/* drive is removable */
		dev_desc->removable = 1;
	}
	memcpy(dev_desc->vendor, (const void *)&usb_stor_buf[8], 8);
	memcpy(dev_desc->product, (const void *)&usb_stor_buf[16], 16);
	memcpy(dev_desc->revision, (const void *)&usb_stor_buf[32], 4);
	dev_desc->vendor[8] = 0;
	dev_desc->product[16] = 0;
	dev_desc->revision[4] = 0;
#ifdef CONFIG_USB_BIN_FIXUP
	usb_bin_fixup(dev->descriptor, (uchar *)dev_desc->vendor,
		      (uchar *)dev_desc->product);
#endif /* CONFIG_USB_BIN_FIXUP */
	debug("ISO Vers %X, Response Data %X\n", usb_stor_buf[2],
	      usb_stor_buf[3]);
	if (usb_test_unit_ready(pccb, ss)) {
		printf("Device NOT ready\n"
		       "   Request Sense returned %02X %02X %02X\n",
		       pccb->sense_buf[2], pccb->sense_buf[12],
		       pccb->sense_buf[13]);
		if (dev_desc->removable == 1)
			dev_desc->type = perq;
		return 0;
	}
	pccb->pdata = (unsigned char *)cap;
	memset(pccb->pdata, 0, 8);
	if (usb_read_capacity(pccb, ss) != 0) {
		printf("READ_CAP ERROR\n");
		ss->flags &= ~USB_READY;
		cap[0] = 2880;
		cap[1] = 0x200;
	}
	debug("Read Capacity returns: 0x%08x, 0x%08x\n", cap[0], cap[1]);
#if 0
	if (cap[0] > (0x200000 * 10)) /* greater than 10 GByte */
		cap[0] >>= 16;

	cap[0] = cpu_to_be32(cap[0]);
	cap[1] = cpu_to_be32(cap[1]);
#endif

	capacity = be32_to_cpu(cap[0]) + 1;
	blksz = be32_to_cpu(cap[1]);

	debug("Capacity = 0x%08x, blocksz = 0x%08x\n", capacity, blksz);
	dev_desc->lba = capacity;
	dev_desc->blksz = blksz;
	dev_desc->log2blksz = LOG2(dev_desc->blksz);
	dev_desc->type = perq;
	debug(" address %d\n", dev_desc->target);

	return 1;
}

#if CONFIG_IS_ENABLED(DM_USB)

static int usb_mass_storage_probe(struct udevice *dev)
{
	struct usb_device *udev = dev_get_parent_priv(dev);
	int ret;

	usb_disable_asynch(1); /* asynch transfer not allowed */
	ret = usb_stor_probe_device(udev);
	usb_disable_asynch(0); /* asynch transfer allowed */

	return ret;
}

static const struct udevice_id usb_mass_storage_ids[] = {
	{ .compatible = "usb-mass-storage" },
	{ }
};

U_BOOT_DRIVER(usb_mass_storage) = {
	.name	= "usb_mass_storage",
	.id	= UCLASS_MASS_STORAGE,
	.of_match = usb_mass_storage_ids,
	.probe = usb_mass_storage_probe,
#if CONFIG_IS_ENABLED(BLK)
	.plat_auto	= sizeof(struct us_data),
#endif
};

UCLASS_DRIVER(usb_mass_storage) = {
	.id		= UCLASS_MASS_STORAGE,
	.name		= "usb_mass_storage",
};

static const struct usb_device_id mass_storage_id_table[] = {
	{
		.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
		.bInterfaceClass = USB_CLASS_MASS_STORAGE
	},
	{ }		/* Terminating entry */
};

U_BOOT_USB_DEVICE(usb_mass_storage, mass_storage_id_table);
#endif

#if CONFIG_IS_ENABLED(BLK)
static const struct blk_ops usb_storage_ops = {
	.read	= usb_stor_read,
	.write	= usb_stor_write,
};

U_BOOT_DRIVER(usb_storage_blk) = {
	.name		= "usb_storage_blk",
	.id		= UCLASS_BLK,
	.ops		= &usb_storage_ops,
};
#else
U_BOOT_LEGACY_BLK(usb) = {
	.if_typename	= "usb",
	.if_type	= IF_TYPE_USB,
	.max_devs	= USB_MAX_STOR_DEV,
	.desc		= usb_dev_desc,
};
#endif