summaryrefslogtreecommitdiff
path: root/common/cmd_usb.c
blob: e04f1c547900a99d27f88a7944a7025a541bd09f (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
/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG Switzerland
 *
 * Most of this source has been derived from the Linux USB
 * project.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 of
 * the License, 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#include <common.h>
#include <command.h>
#include <asm/byteorder.h>
#include <part.h>
#include <usb.h>

#ifdef CONFIG_USB_STORAGE
static int usb_stor_curr_dev = -1; /* current device */
#endif
#ifdef CONFIG_USB_HOST_ETHER
static int usb_ether_curr_dev = -1; /* current ethernet device */
#endif

/* some display routines (info command) */
char *usb_get_class_desc(unsigned char dclass)
{
	switch (dclass) {
	case USB_CLASS_PER_INTERFACE:
		return "See Interface";
	case USB_CLASS_AUDIO:
		return "Audio";
	case USB_CLASS_COMM:
		return "Communication";
	case USB_CLASS_HID:
		return "Human Interface";
	case USB_CLASS_PRINTER:
		return "Printer";
	case USB_CLASS_MASS_STORAGE:
		return "Mass Storage";
	case USB_CLASS_HUB:
		return "Hub";
	case USB_CLASS_DATA:
		return "CDC Data";
	case USB_CLASS_VENDOR_SPEC:
		return "Vendor specific";
	default:
		return "";
	}
}

void usb_display_class_sub(unsigned char dclass, unsigned char subclass,
			   unsigned char proto)
{
	switch (dclass) {
	case USB_CLASS_PER_INTERFACE:
		printf("See Interface");
		break;
	case USB_CLASS_HID:
		printf("Human Interface, Subclass: ");
		switch (subclass) {
		case USB_SUB_HID_NONE:
			printf("None");
			break;
		case USB_SUB_HID_BOOT:
			printf("Boot ");
			switch (proto) {
			case USB_PROT_HID_NONE:
				printf("None");
				break;
			case USB_PROT_HID_KEYBOARD:
				printf("Keyboard");
				break;
			case USB_PROT_HID_MOUSE:
				printf("Mouse");
				break;
			default:
				printf("reserved");
				break;
			}
			break;
		default:
			printf("reserved");
			break;
		}
		break;
	case USB_CLASS_MASS_STORAGE:
		printf("Mass Storage, ");
		switch (subclass) {
		case US_SC_RBC:
			printf("RBC ");
			break;
		case US_SC_8020:
			printf("SFF-8020i (ATAPI)");
			break;
		case US_SC_QIC:
			printf("QIC-157 (Tape)");
			break;
		case US_SC_UFI:
			printf("UFI");
			break;
		case US_SC_8070:
			printf("SFF-8070");
			break;
		case US_SC_SCSI:
			printf("Transp. SCSI");
			break;
		default:
			printf("reserved");
			break;
		}
		printf(", ");
		switch (proto) {
		case US_PR_CB:
			printf("Command/Bulk");
			break;
		case US_PR_CBI:
			printf("Command/Bulk/Int");
			break;
		case US_PR_BULK:
			printf("Bulk only");
			break;
		default:
			printf("reserved");
			break;
		}
		break;
	default:
		printf("%s", usb_get_class_desc(dclass));
		break;
	}
}

void usb_display_string(struct usb_device *dev, int index)
{
	char buffer[256];
	if (index != 0) {
		if (usb_string(dev, index, &buffer[0], 256) > 0)
			printf("String: \"%s\"", buffer);
	}
}

void usb_display_desc(struct usb_device *dev)
{
	if (dev->descriptor.bDescriptorType == USB_DT_DEVICE) {
		printf("%d: %s,  USB Revision %x.%x\n", dev->devnum,
		usb_get_class_desc(dev->config.if_desc[0].desc.bInterfaceClass),
				   (dev->descriptor.bcdUSB>>8) & 0xff,
				   dev->descriptor.bcdUSB & 0xff);

		if (strlen(dev->mf) || strlen(dev->prod) ||
		    strlen(dev->serial))
			printf(" - %s %s %s\n", dev->mf, dev->prod,
				dev->serial);
		if (dev->descriptor.bDeviceClass) {
			printf(" - Class: ");
			usb_display_class_sub(dev->descriptor.bDeviceClass,
					      dev->descriptor.bDeviceSubClass,
					      dev->descriptor.bDeviceProtocol);
			printf("\n");
		} else {
			printf(" - Class: (from Interface) %s\n",
			       usb_get_class_desc(
				dev->config.if_desc[0].desc.bInterfaceClass));
		}
		printf(" - PacketSize: %d  Configurations: %d\n",
			dev->descriptor.bMaxPacketSize0,
			dev->descriptor.bNumConfigurations);
		printf(" - Vendor: 0x%04x  Product 0x%04x Version %d.%d\n",
			dev->descriptor.idVendor, dev->descriptor.idProduct,
			(dev->descriptor.bcdDevice>>8) & 0xff,
			dev->descriptor.bcdDevice & 0xff);
	}

}

void usb_display_conf_desc(struct usb_configuration_descriptor *config,
			   struct usb_device *dev)
{
	printf("   Configuration: %d\n", config->bConfigurationValue);
	printf("   - Interfaces: %d %s%s%dmA\n", config->bNumInterfaces,
	       (config->bmAttributes & 0x40) ? "Self Powered " : "Bus Powered ",
	       (config->bmAttributes & 0x20) ? "Remote Wakeup " : "",
		config->bMaxPower*2);
	if (config->iConfiguration) {
		printf("   - ");
		usb_display_string(dev, config->iConfiguration);
		printf("\n");
	}
}

void usb_display_if_desc(struct usb_interface_descriptor *ifdesc,
			 struct usb_device *dev)
{
	printf("     Interface: %d\n", ifdesc->bInterfaceNumber);
	printf("     - Alternate Setting %d, Endpoints: %d\n",
		ifdesc->bAlternateSetting, ifdesc->bNumEndpoints);
	printf("     - Class ");
	usb_display_class_sub(ifdesc->bInterfaceClass,
		ifdesc->bInterfaceSubClass, ifdesc->bInterfaceProtocol);
	printf("\n");
	if (ifdesc->iInterface) {
		printf("     - ");
		usb_display_string(dev, ifdesc->iInterface);
		printf("\n");
	}
}

void usb_display_ep_desc(struct usb_endpoint_descriptor *epdesc)
{
	printf("     - Endpoint %d %s ", epdesc->bEndpointAddress & 0xf,
		(epdesc->bEndpointAddress & 0x80) ? "In" : "Out");
	switch ((epdesc->bmAttributes & 0x03)) {
	case 0:
		printf("Control");
		break;
	case 1:
		printf("Isochronous");
		break;
	case 2:
		printf("Bulk");
		break;
	case 3:
		printf("Interrupt");
		break;
	}
	printf(" MaxPacket %d", epdesc->wMaxPacketSize);
	if ((epdesc->bmAttributes & 0x03) == 0x3)
		printf(" Interval %dms", epdesc->bInterval);
	printf("\n");
}

/* main routine to diasplay the configs, interfaces and endpoints */
void usb_display_config(struct usb_device *dev)
{
	struct usb_config *config;
	struct usb_interface *ifdesc;
	struct usb_endpoint_descriptor *epdesc;
	int i, ii;

	config = &dev->config;
	usb_display_conf_desc(&config->desc, dev);
	for (i = 0; i < config->no_of_if; i++) {
		ifdesc = &config->if_desc[i];
		usb_display_if_desc(&ifdesc->desc, dev);
		for (ii = 0; ii < ifdesc->no_of_ep; ii++) {
			epdesc = &ifdesc->ep_desc[ii];
			usb_display_ep_desc(epdesc);
		}
	}
	printf("\n");
}

static inline char *portspeed(int speed)
{
	if (speed == USB_SPEED_HIGH)
		return "480 Mb/s";
	else if (speed == USB_SPEED_LOW)
		return "1.5 Mb/s";
	else
		return "12 Mb/s";
}

/* shows the device tree recursively */
void usb_show_tree_graph(struct usb_device *dev, char *pre)
{
	int i, index;
	int has_child, last_child;

	index = strlen(pre);
	printf(" %s", pre);
	/* check if the device has connected children */
	has_child = 0;
	for (i = 0; i < dev->maxchild; i++) {
		if (dev->children[i] != NULL)
			has_child = 1;
	}
	/* check if we are the last one */
	last_child = 1;
	if (dev->parent != NULL) {
		for (i = 0; i < dev->parent->maxchild; i++) {
			/* search for children */
			if (dev->parent->children[i] == dev) {
				/* found our pointer, see if we have a
				 * little sister
				 */
				while (i++ < dev->parent->maxchild) {
					if (dev->parent->children[i] != NULL) {
						/* found a sister */
						last_child = 0;
						break;
					} /* if */
				} /* while */
			} /* device found */
		} /* for all children of the parent */
		printf("\b+-");
		/* correct last child */
		if (last_child)
			pre[index-1] = ' ';
	} /* if not root hub */
	else
		printf(" ");
	printf("%d ", dev->devnum);
	pre[index++] = ' ';
	pre[index++] = has_child ? '|' : ' ';
	pre[index] = 0;
	printf(" %s (%s, %dmA)\n", usb_get_class_desc(
					dev->config.if_desc[0].desc.bInterfaceClass),
					portspeed(dev->speed),
					dev->config.desc.bMaxPower * 2);
	if (strlen(dev->mf) || strlen(dev->prod) || strlen(dev->serial))
		printf(" %s  %s %s %s\n", pre, dev->mf, dev->prod, dev->serial);
	printf(" %s\n", pre);
	if (dev->maxchild > 0) {
		for (i = 0; i < dev->maxchild; i++) {
			if (dev->children[i] != NULL) {
				usb_show_tree_graph(dev->children[i], pre);
				pre[index] = 0;
			}
		}
	}
}

/* main routine for the tree command */
void usb_show_tree(struct usb_device *dev)
{
	char preamble[32];

	memset(preamble, 0, 32);
	usb_show_tree_graph(dev, &preamble[0]);
}


/******************************************************************************
 * usb boot command intepreter. Derived from diskboot
 */
#ifdef CONFIG_USB_STORAGE
int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	char *boot_device = NULL;
	char *ep;
	int dev, part = 1, rcode;
	ulong addr, cnt;
	disk_partition_t info;
	image_header_t *hdr;
	block_dev_desc_t *stor_dev;
#if defined(CONFIG_FIT)
	const void *fit_hdr = NULL;
#endif

	switch (argc) {
	case 1:
		addr = CONFIG_SYS_LOAD_ADDR;
		boot_device = getenv("bootdevice");
		break;
	case 2:
		addr = simple_strtoul(argv[1], NULL, 16);
		boot_device = getenv("bootdevice");
		break;
	case 3:
		addr = simple_strtoul(argv[1], NULL, 16);
		boot_device = argv[2];
		break;
	default:
		return cmd_usage(cmdtp);
	}

	if (!boot_device) {
		puts("\n** No boot device **\n");
		return 1;
	}

	dev = simple_strtoul(boot_device, &ep, 16);
	stor_dev = usb_stor_get_dev(dev);
	if (stor_dev == NULL || stor_dev->type == DEV_TYPE_UNKNOWN) {
		printf("\n** Device %d not available\n", dev);
		return 1;
	}
	if (stor_dev->block_read == NULL) {
		printf("storage device not initialized. Use usb scan\n");
		return 1;
	}
	if (*ep) {
		if (*ep != ':') {
			puts("\n** Invalid boot device, use `dev[:part]' **\n");
			return 1;
		}
		part = simple_strtoul(++ep, NULL, 16);
	}

	if (get_partition_info(stor_dev, part, &info)) {
		/* try to boot raw .... */
		strncpy((char *)&info.type[0], BOOT_PART_TYPE,
			sizeof(BOOT_PART_TYPE));
		strncpy((char *)&info.name[0], "Raw", 4);
		info.start = 0;
		info.blksz = 0x200;
		info.size = 2880;
		printf("error reading partinfo...try to boot raw\n");
	}
	if ((strncmp((char *)info.type, BOOT_PART_TYPE,
	    sizeof(info.type)) != 0) &&
	    (strncmp((char *)info.type, BOOT_PART_COMP,
	    sizeof(info.type)) != 0)) {
		printf("\n** Invalid partition type \"%.32s\""
			" (expect \"" BOOT_PART_TYPE "\")\n",
			info.type);
		return 1;
	}
	printf("\nLoading from USB device %d, partition %d: "
		"Name: %.32s  Type: %.32s\n",
		dev, part, info.name, info.type);

	debug("First Block: %ld,  # of blocks: %ld, Block Size: %ld\n",
		info.start, info.size, info.blksz);

	if (stor_dev->block_read(dev, info.start, 1, (ulong *)addr) != 1) {
		printf("** Read error on %d:%d\n", dev, part);
		return 1;
	}

	switch (genimg_get_format((void *)addr)) {
	case IMAGE_FORMAT_LEGACY:
		hdr = (image_header_t *)addr;

		if (!image_check_hcrc(hdr)) {
			puts("\n** Bad Header Checksum **\n");
			return 1;
		}

		image_print_contents(hdr);

		cnt = image_get_image_size(hdr);
		break;
#if defined(CONFIG_FIT)
	case IMAGE_FORMAT_FIT:
		fit_hdr = (const void *)addr;
		puts("Fit image detected...\n");

		cnt = fit_get_size(fit_hdr);
		break;
#endif
	default:
		puts("** Unknown image type\n");
		return 1;
	}

	cnt += info.blksz - 1;
	cnt /= info.blksz;
	cnt -= 1;

	if (stor_dev->block_read(dev, info.start+1, cnt,
		      (ulong *)(addr+info.blksz)) != cnt) {
		printf("\n** Read error on %d:%d\n", dev, part);
		return 1;
	}

#if defined(CONFIG_FIT)
	/* This cannot be done earlier, we need complete FIT image in RAM
	 * first
	 */
	if (genimg_get_format((void *)addr) == IMAGE_FORMAT_FIT) {
		if (!fit_check_format(fit_hdr)) {
			puts("** Bad FIT image format\n");
			return 1;
		}
		fit_print_contents(fit_hdr);
	}
#endif

	/* Loading ok, update default load address */
	load_addr = addr;

	flush_cache(addr, (cnt+1)*info.blksz);

	/* Check if we should attempt an auto-start */
	if (((ep = getenv("autostart")) != NULL) && (strcmp(ep, "yes") == 0)) {
		char *local_args[2];
		local_args[0] = argv[0];
		local_args[1] = NULL;
		printf("Automatic boot of image at addr 0x%08lX ...\n", addr);
		rcode = do_bootm(cmdtp, 0, 1, local_args);
		return rcode;
	}
	return 0;
}
#endif /* CONFIG_USB_STORAGE */


/******************************************************************************
 * usb command intepreter
 */
int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{

	int i;
	struct usb_device *dev = NULL;
	extern char usb_started;
#ifdef CONFIG_USB_STORAGE
	block_dev_desc_t *stor_dev;
#endif

	if (argc < 2)
		return cmd_usage(cmdtp);

	if ((strncmp(argv[1], "reset", 5) == 0) ||
		 (strncmp(argv[1], "start", 5) == 0)) {
		bootstage_mark(BOOTSTAGE_USB_START, "usb_start");
		usb_stop();
		printf("(Re)start USB...\n");
		i = usb_init();
		if (i >= 0) {
#ifdef CONFIG_USB_KEYBOARD
			drv_usb_kbd_init();
#endif
#ifdef CONFIG_USB_STORAGE
			/* try to recognize storage devices immediately */
			usb_stor_curr_dev = usb_stor_scan(1);
#endif
#ifdef CONFIG_USB_HOST_ETHER
			/* try to recognize ethernet devices immediately */
			usb_ether_curr_dev = usb_host_eth_scan(1);
#endif
		}
		return 0;
	}
	if (strncmp(argv[1], "stop", 4) == 0) {
#ifdef CONFIG_USB_KEYBOARD
		if (argc == 2) {
			if (usb_kbd_deregister() != 0) {
				printf("USB not stopped: usbkbd still"
					" using USB\n");
				return 1;
			}
		} else {
			/* forced stop, switch console in to serial */
			console_assign(stdin, "serial");
			usb_kbd_deregister();
		}
#endif
		printf("stopping USB..\n");
		usb_stop();
		return 0;
	}
	if (!usb_started) {
		printf("USB is stopped. Please issue 'usb start' first.\n");
		return 1;
	}
	if (strncmp(argv[1], "tree", 4) == 0) {
		printf("\nDevice Tree:\n");
		usb_show_tree(usb_get_dev_index(0));
		return 0;
	}
	if (strncmp(argv[1], "inf", 3) == 0) {
		int d;
		if (argc == 2) {
			for (d = 0; d < USB_MAX_DEVICE; d++) {
				dev = usb_get_dev_index(d);
				if (dev == NULL)
					break;
				usb_display_desc(dev);
				usb_display_config(dev);
			}
			return 0;
		} else {
			int d;

			i = simple_strtoul(argv[2], NULL, 16);
			printf("config for device %d\n", i);
			for (d = 0; d < USB_MAX_DEVICE; d++) {
				dev = usb_get_dev_index(d);
				if (dev == NULL)
					break;
				if (dev->devnum == i)
					break;
			}
			if (dev == NULL) {
				printf("*** No device available ***\n");
				return 0;
			} else {
				usb_display_desc(dev);
				usb_display_config(dev);
			}
		}
		return 0;
	}
#ifdef CONFIG_USB_STORAGE
	if (strncmp(argv[1], "stor", 4) == 0)
		return usb_stor_info();

	if (strncmp(argv[1], "part", 4) == 0) {
		int devno, ok = 0;
		if (argc == 2) {
			for (devno = 0; ; ++devno) {
				stor_dev = usb_stor_get_dev(devno);
				if (stor_dev == NULL)
					break;
				if (stor_dev->type != DEV_TYPE_UNKNOWN) {
					ok++;
					if (devno)
						printf("\n");
					debug("print_part of %x\n", devno);
					print_part(stor_dev);
				}
			}
		} else {
			devno = simple_strtoul(argv[2], NULL, 16);
			stor_dev = usb_stor_get_dev(devno);
			if (stor_dev != NULL &&
			    stor_dev->type != DEV_TYPE_UNKNOWN) {
				ok++;
				debug("print_part of %x\n", devno);
				print_part(stor_dev);
			}
		}
		if (!ok) {
			printf("\nno USB devices available\n");
			return 1;
		}
		return 0;
	}
	if (strcmp(argv[1], "read") == 0) {
		if (usb_stor_curr_dev < 0) {
			printf("no current device selected\n");
			return 1;
		}
		if (argc == 5) {
			unsigned long addr = simple_strtoul(argv[2], NULL, 16);
			unsigned long blk  = simple_strtoul(argv[3], NULL, 16);
			unsigned long cnt  = simple_strtoul(argv[4], NULL, 16);
			unsigned long n;
			printf("\nUSB read: device %d block # %ld, count %ld"
				" ... ", usb_stor_curr_dev, blk, cnt);
			stor_dev = usb_stor_get_dev(usb_stor_curr_dev);
			n = stor_dev->block_read(usb_stor_curr_dev, blk, cnt,
						 (ulong *)addr);
			printf("%ld blocks read: %s\n", n,
				(n == cnt) ? "OK" : "ERROR");
			if (n == cnt)
				return 0;
			return 1;
		}
	}
	if (strcmp(argv[1], "write") == 0) {
		if (usb_stor_curr_dev < 0) {
			printf("no current device selected\n");
			return 1;
		}
		if (argc == 5) {
			unsigned long addr = simple_strtoul(argv[2], NULL, 16);
			unsigned long blk  = simple_strtoul(argv[3], NULL, 16);
			unsigned long cnt  = simple_strtoul(argv[4], NULL, 16);
			unsigned long n;
			printf("\nUSB write: device %d block # %ld, count %ld"
				" ... ", usb_stor_curr_dev, blk, cnt);
			stor_dev = usb_stor_get_dev(usb_stor_curr_dev);
			n = stor_dev->block_write(usb_stor_curr_dev, blk, cnt,
						(ulong *)addr);
			printf("%ld blocks write: %s\n", n,
				(n == cnt) ? "OK" : "ERROR");
			if (n == cnt)
				return 0;
			return 1;
		}
	}
	if (strncmp(argv[1], "dev", 3) == 0) {
		if (argc == 3) {
			int dev = (int)simple_strtoul(argv[2], NULL, 10);
			printf("\nUSB device %d: ", dev);
			stor_dev = usb_stor_get_dev(dev);
			if (stor_dev == NULL) {
				printf("unknown device\n");
				return 1;
			}
			printf("\n    Device %d: ", dev);
			dev_print(stor_dev);
			if (stor_dev->type == DEV_TYPE_UNKNOWN)
				return 1;
			usb_stor_curr_dev = dev;
			printf("... is now current device\n");
			return 0;
		} else {
			printf("\nUSB device %d: ", usb_stor_curr_dev);
			stor_dev = usb_stor_get_dev(usb_stor_curr_dev);
			dev_print(stor_dev);
			if (stor_dev->type == DEV_TYPE_UNKNOWN)
				return 1;
			return 0;
		}
		return 0;
	}
#endif /* CONFIG_USB_STORAGE */
	return cmd_usage(cmdtp);
}

#ifdef CONFIG_USB_STORAGE
U_BOOT_CMD(
	usb,	5,	1,	do_usb,
	"USB sub-system",
	"reset - reset (rescan) USB controller\n"
	"usb stop [f]  - stop USB [f]=force stop\n"
	"usb tree  - show USB device tree\n"
	"usb info [dev] - show available USB devices\n"
	"usb storage  - show details of USB storage devices\n"
	"usb dev [dev] - show or set current USB storage device\n"
	"usb part [dev] - print partition table of one or all USB storage"
	" devices\n"
	"usb read addr blk# cnt - read `cnt' blocks starting at block `blk#'\n"
	"    to memory address `addr'\n"
	"usb write addr blk# cnt - write `cnt' blocks starting at block `blk#'\n"
	"    from memory address `addr'"
);


U_BOOT_CMD(
	usbboot,	3,	1,	do_usbboot,
	"boot from USB device",
	"loadAddr dev:part"
);

#else
U_BOOT_CMD(
	usb,	5,	1,	do_usb,
	"USB sub-system",
	"reset - reset (rescan) USB controller\n"
	"usb  tree  - show USB device tree\n"
	"usb  info [dev] - show available USB devices"
);
#endif