summaryrefslogtreecommitdiff
path: root/common/usb.c
blob: b70f614d244f56a2ea2c29b007f45158dc92818c (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Most of this source has been derived from the Linux USB
 * project:
 * (C) Copyright Linus Torvalds 1999
 * (C) Copyright Johannes Erdfelt 1999-2001
 * (C) Copyright Andreas Gal 1999
 * (C) Copyright Gregory P. Smith 1999
 * (C) Copyright Deti Fliegl 1999 (new USB architecture)
 * (C) Copyright Randy Dunlap 2000
 * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
 * (C) Copyright Yggdrasil Computing, Inc. 2000
 *     (usb_device_id matching changes by Adam J. Richter)
 *
 * Adapted for U-Boot:
 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
 */

/*
 * How it works:
 *
 * Since this is a bootloader, the devices will not be automatic
 * (re)configured on hotplug, but after a restart of the USB the
 * device should work.
 *
 * For each transfer (except "Interrupt") we wait for completion.
 */
#include <common.h>
#include <command.h>
#include <dm.h>
#include <memalign.h>
#include <asm/processor.h>
#include <linux/compiler.h>
#include <linux/ctype.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <errno.h>
#include <usb.h>

#define USB_BUFSIZ	512

static int asynch_allowed;
char usb_started; /* flag for the started/stopped USB status */

#if !CONFIG_IS_ENABLED(DM_USB)
static struct usb_device usb_dev[USB_MAX_DEVICE];
static int dev_index;

#ifndef CONFIG_USB_MAX_CONTROLLER_COUNT
#define CONFIG_USB_MAX_CONTROLLER_COUNT 1
#endif

/***************************************************************************
 * Init USB Device
 */
int usb_init(void)
{
	void *ctrl;
	struct usb_device *dev;
	int i, start_index = 0;
	int controllers_initialized = 0;
	int ret;

	dev_index = 0;
	asynch_allowed = 1;
	usb_hub_reset();

	/* first make all devices unknown */
	for (i = 0; i < USB_MAX_DEVICE; i++) {
		memset(&usb_dev[i], 0, sizeof(struct usb_device));
		usb_dev[i].devnum = -1;
	}

	/* init low_level USB */
	for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
		/* init low_level USB */
		printf("USB%d:   ", i);
		ret = usb_lowlevel_init(i, USB_INIT_HOST, &ctrl);
		if (ret == -ENODEV) {	/* No such device. */
			puts("Port not available.\n");
			controllers_initialized++;
			continue;
		}

		if (ret) {		/* Other error. */
			puts("lowlevel init failed\n");
			continue;
		}
		/*
		 * lowlevel init is OK, now scan the bus for devices
		 * i.e. search HUBs and configure them
		 */
		controllers_initialized++;
		start_index = dev_index;
		printf("scanning bus %d for devices... ", i);
		ret = usb_alloc_new_device(ctrl, &dev);
		if (ret)
			break;

		/*
		 * device 0 is always present
		 * (root hub, so let it analyze)
		 */
		ret = usb_new_device(dev);
		if (ret)
			usb_free_device(dev->controller);

		if (start_index == dev_index) {
			puts("No USB Device found\n");
			continue;
		} else {
			printf("%d USB Device(s) found\n",
				dev_index - start_index);
		}

		usb_started = 1;
	}

	debug("scan end\n");
	/* if we were not able to find at least one working bus, bail out */
	if (controllers_initialized == 0)
		puts("USB error: all controllers failed lowlevel init\n");

	return usb_started ? 0 : -ENODEV;
}

/******************************************************************************
 * Stop USB this stops the LowLevel Part and deregisters USB devices.
 */
int usb_stop(void)
{
	int i;

	if (usb_started) {
		asynch_allowed = 1;
		usb_started = 0;
		usb_hub_reset();

		for (i = 0; i < CONFIG_USB_MAX_CONTROLLER_COUNT; i++) {
			if (usb_lowlevel_stop(i))
				printf("failed to stop USB controller %d\n", i);
		}
	}

	return 0;
}

/******************************************************************************
 * Detect if a USB device has been plugged or unplugged.
 */
int usb_detect_change(void)
{
	int i, j;
	int change = 0;

	for (j = 0; j < USB_MAX_DEVICE; j++) {
		for (i = 0; i < usb_dev[j].maxchild; i++) {
			struct usb_port_status status;

			if (usb_get_port_status(&usb_dev[j], i + 1,
						&status) < 0)
				/* USB request failed */
				continue;

			if (le16_to_cpu(status.wPortChange) &
			    USB_PORT_STAT_C_CONNECTION)
				change++;
		}
	}

	return change;
}

/*
 * disables the asynch behaviour of the control message. This is used for data
 * transfers that uses the exclusiv access to the control and bulk messages.
 * Returns the old value so it can be restored later.
 */
int usb_disable_asynch(int disable)
{
	int old_value = asynch_allowed;

	asynch_allowed = !disable;
	return old_value;
}
#endif /* !CONFIG_IS_ENABLED(DM_USB) */


/*-------------------------------------------------------------------
 * Message wrappers.
 *
 */

/*
 * submits an Interrupt Message
 */
int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
			void *buffer, int transfer_len, int interval)
{
	return submit_int_msg(dev, pipe, buffer, transfer_len, interval);
}

/*
 * submits a control message and waits for comletion (at least timeout * 1ms)
 * If timeout is 0, we don't wait for completion (used as example to set and
 * clear keyboards LEDs). For data transfers, (storage transfers) we don't
 * allow control messages with 0 timeout, by previousely resetting the flag
 * asynch_allowed (usb_disable_asynch(1)).
 * returns the transferred length if OK or -1 if error. The transferred length
 * and the current status are stored in the dev->act_len and dev->status.
 */
int usb_control_msg(struct usb_device *dev, unsigned int pipe,
			unsigned char request, unsigned char requesttype,
			unsigned short value, unsigned short index,
			void *data, unsigned short size, int timeout)
{
	ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet, 1);
	int err;

	if ((timeout == 0) && (!asynch_allowed)) {
		/* request for a asynch control pipe is not allowed */
		return -EINVAL;
	}

	/* set setup command */
	setup_packet->requesttype = requesttype;
	setup_packet->request = request;
	setup_packet->value = cpu_to_le16(value);
	setup_packet->index = cpu_to_le16(index);
	setup_packet->length = cpu_to_le16(size);
	debug("usb_control_msg: request: 0x%X, requesttype: 0x%X, " \
	      "value 0x%X index 0x%X length 0x%X\n",
	      request, requesttype, value, index, size);
	dev->status = USB_ST_NOT_PROC; /*not yet processed */

	err = submit_control_msg(dev, pipe, data, size, setup_packet);
	if (err < 0)
		return err;
	if (timeout == 0)
		return (int)size;

	/*
	 * Wait for status to update until timeout expires, USB driver
	 * interrupt handler may set the status when the USB operation has
	 * been completed.
	 */
	while (timeout--) {
		if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
			break;
		mdelay(1);
	}
	if (dev->status)
		return -1;

	return dev->act_len;

}

/*-------------------------------------------------------------------
 * submits bulk message, and waits for completion. returns 0 if Ok or
 * negative if Error.
 * synchronous behavior
 */
int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
			void *data, int len, int *actual_length, int timeout)
{
	if (len < 0)
		return -EINVAL;
	dev->status = USB_ST_NOT_PROC; /*not yet processed */
	if (submit_bulk_msg(dev, pipe, data, len) < 0)
		return -EIO;
	while (timeout--) {
		if (!((volatile unsigned long)dev->status & USB_ST_NOT_PROC))
			break;
		mdelay(1);
	}
	*actual_length = dev->act_len;
	if (dev->status == 0)
		return 0;
	else
		return -EIO;
}


/*-------------------------------------------------------------------
 * Max Packet stuff
 */

/*
 * returns the max packet size, depending on the pipe direction and
 * the configurations values
 */
int usb_maxpacket(struct usb_device *dev, unsigned long pipe)
{
	/* direction is out -> use emaxpacket out */
	if ((pipe & USB_DIR_IN) == 0)
		return dev->epmaxpacketout[((pipe>>15) & 0xf)];
	else
		return dev->epmaxpacketin[((pipe>>15) & 0xf)];
}

/*
 * The routine usb_set_maxpacket_ep() is extracted from the loop of routine
 * usb_set_maxpacket(), because the optimizer of GCC 4.x chokes on this routine
 * when it is inlined in 1 single routine. What happens is that the register r3
 * is used as loop-count 'i', but gets overwritten later on.
 * This is clearly a compiler bug, but it is easier to workaround it here than
 * to update the compiler (Occurs with at least several GCC 4.{1,2},x
 * CodeSourcery compilers like e.g. 2007q3, 2008q1, 2008q3 lite editions on ARM)
 *
 * NOTE: Similar behaviour was observed with GCC4.6 on ARMv5.
 */
static void noinline
usb_set_maxpacket_ep(struct usb_device *dev, int if_idx, int ep_idx)
{
	int b;
	struct usb_endpoint_descriptor *ep;
	u16 ep_wMaxPacketSize;

	ep = &dev->config.if_desc[if_idx].ep_desc[ep_idx];

	b = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
	ep_wMaxPacketSize = get_unaligned(&ep->wMaxPacketSize);

	if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
						USB_ENDPOINT_XFER_CONTROL) {
		/* Control => bidirectional */
		dev->epmaxpacketout[b] = ep_wMaxPacketSize;
		dev->epmaxpacketin[b] = ep_wMaxPacketSize;
		debug("##Control EP epmaxpacketout/in[%d] = %d\n",
		      b, dev->epmaxpacketin[b]);
	} else {
		if ((ep->bEndpointAddress & 0x80) == 0) {
			/* OUT Endpoint */
			if (ep_wMaxPacketSize > dev->epmaxpacketout[b]) {
				dev->epmaxpacketout[b] = ep_wMaxPacketSize;
				debug("##EP epmaxpacketout[%d] = %d\n",
				      b, dev->epmaxpacketout[b]);
			}
		} else {
			/* IN Endpoint */
			if (ep_wMaxPacketSize > dev->epmaxpacketin[b]) {
				dev->epmaxpacketin[b] = ep_wMaxPacketSize;
				debug("##EP epmaxpacketin[%d] = %d\n",
				      b, dev->epmaxpacketin[b]);
			}
		} /* if out */
	} /* if control */
}

/*
 * set the max packed value of all endpoints in the given configuration
 */
static int usb_set_maxpacket(struct usb_device *dev)
{
	int i, ii;

	for (i = 0; i < dev->config.desc.bNumInterfaces; i++)
		for (ii = 0; ii < dev->config.if_desc[i].desc.bNumEndpoints; ii++)
			usb_set_maxpacket_ep(dev, i, ii);

	return 0;
}

/*******************************************************************************
 * Parse the config, located in buffer, and fills the dev->config structure.
 * Note that all little/big endian swapping are done automatically.
 * (wTotalLength has already been swapped and sanitized when it was read.)
 */
static int usb_parse_config(struct usb_device *dev,
			unsigned char *buffer, int cfgno)
{
	struct usb_descriptor_header *head;
	int index, ifno, epno, curr_if_num;
	u16 ep_wMaxPacketSize;
	struct usb_interface *if_desc = NULL;

	ifno = -1;
	epno = -1;
	curr_if_num = -1;

	dev->configno = cfgno;
	head = (struct usb_descriptor_header *) &buffer[0];
	if (head->bDescriptorType != USB_DT_CONFIG) {
		printf(" ERROR: NOT USB_CONFIG_DESC %x\n",
			head->bDescriptorType);
		return -EINVAL;
	}
	if (head->bLength != USB_DT_CONFIG_SIZE) {
		printf("ERROR: Invalid USB CFG length (%d)\n", head->bLength);
		return -EINVAL;
	}
	memcpy(&dev->config, head, USB_DT_CONFIG_SIZE);
	dev->config.no_of_if = 0;

	index = dev->config.desc.bLength;
	/* Ok the first entry must be a configuration entry,
	 * now process the others */
	head = (struct usb_descriptor_header *) &buffer[index];
	while (index + 1 < dev->config.desc.wTotalLength && head->bLength) {
		switch (head->bDescriptorType) {
		case USB_DT_INTERFACE:
			if (head->bLength != USB_DT_INTERFACE_SIZE) {
				printf("ERROR: Invalid USB IF length (%d)\n",
					head->bLength);
				break;
			}
			if (index + USB_DT_INTERFACE_SIZE >
			    dev->config.desc.wTotalLength) {
				puts("USB IF descriptor overflowed buffer!\n");
				break;
			}
			if (((struct usb_interface_descriptor *) \
			     head)->bInterfaceNumber != curr_if_num) {
				/* this is a new interface, copy new desc */
				ifno = dev->config.no_of_if;
				if (ifno >= USB_MAXINTERFACES) {
					puts("Too many USB interfaces!\n");
					/* try to go on with what we have */
					return -EINVAL;
				}
				if_desc = &dev->config.if_desc[ifno];
				dev->config.no_of_if++;
				memcpy(if_desc, head,
					USB_DT_INTERFACE_SIZE);
				if_desc->no_of_ep = 0;
				if_desc->num_altsetting = 1;
				curr_if_num =
				     if_desc->desc.bInterfaceNumber;
			} else {
				/* found alternate setting for the interface */
				if (ifno >= 0) {
					if_desc = &dev->config.if_desc[ifno];
					if_desc->num_altsetting++;
				}
			}
			break;
		case USB_DT_ENDPOINT:
			if (head->bLength != USB_DT_ENDPOINT_SIZE &&
			    head->bLength != USB_DT_ENDPOINT_AUDIO_SIZE) {
				printf("ERROR: Invalid USB EP length (%d)\n",
					head->bLength);
				break;
			}
			if (index + head->bLength >
			    dev->config.desc.wTotalLength) {
				puts("USB EP descriptor overflowed buffer!\n");
				break;
			}
			if (ifno < 0) {
				puts("Endpoint descriptor out of order!\n");
				break;
			}
			epno = dev->config.if_desc[ifno].no_of_ep;
			if_desc = &dev->config.if_desc[ifno];
			if (epno >= USB_MAXENDPOINTS) {
				printf("Interface %d has too many endpoints!\n",
					if_desc->desc.bInterfaceNumber);
				return -EINVAL;
			}
			/* found an endpoint */
			if_desc->no_of_ep++;
			memcpy(&if_desc->ep_desc[epno], head,
				USB_DT_ENDPOINT_SIZE);
			ep_wMaxPacketSize = get_unaligned(&dev->config.\
							if_desc[ifno].\
							ep_desc[epno].\
							wMaxPacketSize);
			put_unaligned(le16_to_cpu(ep_wMaxPacketSize),
					&dev->config.\
					if_desc[ifno].\
					ep_desc[epno].\
					wMaxPacketSize);
			debug("if %d, ep %d\n", ifno, epno);
			break;
		case USB_DT_SS_ENDPOINT_COMP:
			if (head->bLength != USB_DT_SS_EP_COMP_SIZE) {
				printf("ERROR: Invalid USB EPC length (%d)\n",
					head->bLength);
				break;
			}
			if (index + USB_DT_SS_EP_COMP_SIZE >
			    dev->config.desc.wTotalLength) {
				puts("USB EPC descriptor overflowed buffer!\n");
				break;
			}
			if (ifno < 0 || epno < 0) {
				puts("EPC descriptor out of order!\n");
				break;
			}
			if_desc = &dev->config.if_desc[ifno];
			memcpy(&if_desc->ss_ep_comp_desc[epno], head,
				USB_DT_SS_EP_COMP_SIZE);
			break;
		default:
			if (head->bLength == 0)
				return -EINVAL;

			debug("unknown Description Type : %x\n",
			      head->bDescriptorType);

#ifdef DEBUG
			{
				unsigned char *ch = (unsigned char *)head;
				int i;

				for (i = 0; i < head->bLength; i++)
					debug("%02X ", *ch++);
				debug("\n\n\n");
			}
#endif
			break;
		}
		index += head->bLength;
		head = (struct usb_descriptor_header *)&buffer[index];
	}
	return 0;
}

/***********************************************************************
 * Clears an endpoint
 * endp: endpoint number in bits 0-3;
 * direction flag in bit 7 (1 = IN, 0 = OUT)
 */
int usb_clear_halt(struct usb_device *dev, int pipe)
{
	int result;
	int endp = usb_pipeendpoint(pipe)|(usb_pipein(pipe)<<7);

	result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 0,
				 endp, NULL, 0, USB_CNTL_TIMEOUT * 3);

	/* don't clear if failed */
	if (result < 0)
		return result;

	/*
	 * NOTE: we do not get status and verify reset was successful
	 * as some devices are reported to lock up upon this check..
	 */

	usb_endpoint_running(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));

	/* toggle is reset on clear */
	usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
	return 0;
}


/**********************************************************************
 * get_descriptor type
 */
static int usb_get_descriptor(struct usb_device *dev, unsigned char type,
			unsigned char index, void *buf, int size)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			       USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
			       (type << 8) + index, 0, buf, size,
			       USB_CNTL_TIMEOUT);
}

/**********************************************************************
 * gets len of configuration cfgno
 */
int usb_get_configuration_len(struct usb_device *dev, int cfgno)
{
	int result;
	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, 9);
	struct usb_config_descriptor *config;

	config = (struct usb_config_descriptor *)&buffer[0];
	result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, 9);
	if (result < 9) {
		if (result < 0)
			printf("unable to get descriptor, error %lX\n",
				dev->status);
		else
			printf("config descriptor too short " \
				"(expected %i, got %i)\n", 9, result);
		return -EIO;
	}
	return le16_to_cpu(config->wTotalLength);
}

/**********************************************************************
 * gets configuration cfgno and store it in the buffer
 */
int usb_get_configuration_no(struct usb_device *dev, int cfgno,
			     unsigned char *buffer, int length)
{
	int result;
	struct usb_config_descriptor *config;

	config = (struct usb_config_descriptor *)&buffer[0];
	result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, length);
	debug("get_conf_no %d Result %d, wLength %d\n", cfgno, result,
	      le16_to_cpu(config->wTotalLength));
	config->wTotalLength = result; /* validated, with CPU byte order */

	return result;
}

/********************************************************************
 * set address of a device to the value in dev->devnum.
 * This can only be done by addressing the device via the default address (0)
 */
static int usb_set_address(struct usb_device *dev)
{
	debug("set address %d\n", dev->devnum);

	return usb_control_msg(dev, usb_snddefctrl(dev), USB_REQ_SET_ADDRESS,
			       0, (dev->devnum), 0, NULL, 0, USB_CNTL_TIMEOUT);
}

/********************************************************************
 * set interface number to interface
 */
int usb_set_interface(struct usb_device *dev, int interface, int alternate)
{
	struct usb_interface *if_face = NULL;
	int ret, i;

	for (i = 0; i < dev->config.desc.bNumInterfaces; i++) {
		if (dev->config.if_desc[i].desc.bInterfaceNumber == interface) {
			if_face = &dev->config.if_desc[i];
			break;
		}
	}
	if (!if_face) {
		printf("selecting invalid interface %d", interface);
		return -EINVAL;
	}
	/*
	 * We should return now for devices with only one alternate setting.
	 * According to 9.4.10 of the Universal Serial Bus Specification
	 * Revision 2.0 such devices can return with a STALL. This results in
	 * some USB sticks timeouting during initialization and then being
	 * unusable in U-Boot.
	 */
	if (if_face->num_altsetting == 1)
		return 0;

	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE,
				alternate, interface, NULL, 0,
				USB_CNTL_TIMEOUT * 5);
	if (ret < 0)
		return ret;

	return 0;
}

/********************************************************************
 * set configuration number to configuration
 */
static int usb_set_configuration(struct usb_device *dev, int configuration)
{
	int res;
	debug("set configuration %d\n", configuration);
	/* set setup command */
	res = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				USB_REQ_SET_CONFIGURATION, 0,
				configuration, 0,
				NULL, 0, USB_CNTL_TIMEOUT);
	if (res == 0) {
		dev->toggle[0] = 0;
		dev->toggle[1] = 0;
		return 0;
	} else
		return -EIO;
}

/********************************************************************
 * set protocol to protocol
 */
int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		USB_REQ_SET_PROTOCOL, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
		protocol, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
}

/********************************************************************
 * set idle
 */
int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		USB_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
		(duration << 8) | report_id, ifnum, NULL, 0, USB_CNTL_TIMEOUT);
}

/********************************************************************
 * get report
 */
int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
		   unsigned char id, void *buf, int size)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			USB_REQ_GET_REPORT,
			USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
			(type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
}

/********************************************************************
 * get class descriptor
 */
int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
		unsigned char type, unsigned char id, void *buf, int size)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
		(type << 8) + id, ifnum, buf, size, USB_CNTL_TIMEOUT);
}

/********************************************************************
 * get string index in buffer
 */
static int usb_get_string(struct usb_device *dev, unsigned short langid,
		   unsigned char index, void *buf, int size)
{
	int i;
	int result;

	for (i = 0; i < 3; ++i) {
		/* some devices are flaky */
		result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
			(USB_DT_STRING << 8) + index, langid, buf, size,
			USB_CNTL_TIMEOUT);

		if (result > 0)
			break;
	}

	return result;
}


static void usb_try_string_workarounds(unsigned char *buf, int *length)
{
	int newlength, oldlength = *length;

	for (newlength = 2; newlength + 1 < oldlength; newlength += 2)
		if (!isprint(buf[newlength]) || buf[newlength + 1])
			break;

	if (newlength > 2) {
		buf[0] = newlength;
		*length = newlength;
	}
}


static int usb_string_sub(struct usb_device *dev, unsigned int langid,
		unsigned int index, unsigned char *buf)
{
	int rc;

	/* Try to read the string descriptor by asking for the maximum
	 * possible number of bytes */
	rc = usb_get_string(dev, langid, index, buf, 255);

	/* If that failed try to read the descriptor length, then
	 * ask for just that many bytes */
	if (rc < 2) {
		rc = usb_get_string(dev, langid, index, buf, 2);
		if (rc == 2)
			rc = usb_get_string(dev, langid, index, buf, buf[0]);
	}

	if (rc >= 2) {
		if (!buf[0] && !buf[1])
			usb_try_string_workarounds(buf, &rc);

		/* There might be extra junk at the end of the descriptor */
		if (buf[0] < rc)
			rc = buf[0];

		rc = rc - (rc & 1); /* force a multiple of two */
	}

	if (rc < 2)
		rc = -EINVAL;

	return rc;
}


/********************************************************************
 * usb_string:
 * Get string index and translate it to ascii.
 * returns string length (> 0) or error (< 0)
 */
int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
{
	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, mybuf, USB_BUFSIZ);
	unsigned char *tbuf;
	int err;
	unsigned int u, idx;

	if (size <= 0 || !buf || !index)
		return -EINVAL;
	buf[0] = 0;
	tbuf = &mybuf[0];

	/* get langid for strings if it's not yet known */
	if (!dev->have_langid) {
		err = usb_string_sub(dev, 0, 0, tbuf);
		if (err < 0) {
			debug("error getting string descriptor 0 " \
			      "(error=%lx)\n", dev->status);
			return -EIO;
		} else if (tbuf[0] < 4) {
			debug("string descriptor 0 too short\n");
			return -EIO;
		} else {
			dev->have_langid = -1;
			dev->string_langid = tbuf[2] | (tbuf[3] << 8);
				/* always use the first langid listed */
			debug("USB device number %d default " \
			      "language ID 0x%x\n",
			      dev->devnum, dev->string_langid);
		}
	}

	err = usb_string_sub(dev, dev->string_langid, index, tbuf);
	if (err < 0)
		return err;

	size--;		/* leave room for trailing NULL char in output buffer */
	for (idx = 0, u = 2; u < err; u += 2) {
		if (idx >= size)
			break;
		if (tbuf[u+1])			/* high byte */
			buf[idx++] = '?';  /* non-ASCII character */
		else
			buf[idx++] = tbuf[u];
	}
	buf[idx] = 0;
	err = idx;
	return err;
}


/********************************************************************
 * USB device handling:
 * the USB device are static allocated [USB_MAX_DEVICE].
 */

#if !CONFIG_IS_ENABLED(DM_USB)

/* returns a pointer to the device with the index [index].
 * if the device is not assigned (dev->devnum==-1) returns NULL
 */
struct usb_device *usb_get_dev_index(int index)
{
	if (usb_dev[index].devnum == -1)
		return NULL;
	else
		return &usb_dev[index];
}

int usb_alloc_new_device(struct udevice *controller, struct usb_device **devp)
{
	int i;
	debug("New Device %d\n", dev_index);
	if (dev_index == USB_MAX_DEVICE) {
		printf("ERROR, too many USB Devices, max=%d\n", USB_MAX_DEVICE);
		return -ENOSPC;
	}
	/* default Address is 0, real addresses start with 1 */
	usb_dev[dev_index].devnum = dev_index + 1;
	usb_dev[dev_index].maxchild = 0;
	for (i = 0; i < USB_MAXCHILDREN; i++)
		usb_dev[dev_index].children[i] = NULL;
	usb_dev[dev_index].parent = NULL;
	usb_dev[dev_index].controller = controller;
	dev_index++;
	*devp = &usb_dev[dev_index - 1];

	return 0;
}

/*
 * Free the newly created device node.
 * Called in error cases where configuring a newly attached
 * device fails for some reason.
 */
void usb_free_device(struct udevice *controller)
{
	dev_index--;
	debug("Freeing device node: %d\n", dev_index);
	memset(&usb_dev[dev_index], 0, sizeof(struct usb_device));
	usb_dev[dev_index].devnum = -1;
}

/*
 * XHCI issues Enable Slot command and thereafter
 * allocates device contexts. Provide a weak alias
 * function for the purpose, so that XHCI overrides it
 * and EHCI/OHCI just work out of the box.
 */
__weak int usb_alloc_device(struct usb_device *udev)
{
	return 0;
}
#endif /* !CONFIG_IS_ENABLED(DM_USB) */

static int usb_hub_port_reset(struct usb_device *dev, struct usb_device *hub)
{
	if (!hub)
		usb_reset_root_port(dev);

	return 0;
}

static int get_descriptor_len(struct usb_device *dev, int len, int expect_len)
{
	__maybe_unused struct usb_device_descriptor *desc;
	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ);
	int err;

	desc = (struct usb_device_descriptor *)tmpbuf;

	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, len);
	if (err < expect_len) {
		if (err < 0) {
			printf("unable to get device descriptor (error=%d)\n",
				err);
			return err;
		} else {
			printf("USB device descriptor short read (expected %i, got %i)\n",
				expect_len, err);
			return -EIO;
		}
	}
	memcpy(&dev->descriptor, tmpbuf, sizeof(dev->descriptor));

	return 0;
}

static int usb_setup_descriptor(struct usb_device *dev, bool do_read)
{
	/*
	 * This is a Windows scheme of initialization sequence, with double
	 * reset of the device (Linux uses the same sequence)
	 * Some equipment is said to work only with such init sequence; this
	 * patch is based on the work by Alan Stern:
	 * http://sourceforge.net/mailarchive/forum.php?
	 * thread_id=5729457&forum_id=5398
	 */

	/*
	 * send 64-byte GET-DEVICE-DESCRIPTOR request.  Since the descriptor is
	 * only 18 bytes long, this will terminate with a short packet.  But if
	 * the maxpacket size is 8 or 16 the device may be waiting to transmit
	 * some more, or keeps on retransmitting the 8 byte header.
	 */

	if (dev->speed == USB_SPEED_LOW) {
		dev->descriptor.bMaxPacketSize0 = 8;
		dev->maxpacketsize = PACKET_SIZE_8;
	} else {
		dev->descriptor.bMaxPacketSize0 = 64;
		dev->maxpacketsize = PACKET_SIZE_64;
	}
	dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
	dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;

	if (do_read && dev->speed == USB_SPEED_FULL) {
		int err;

		/*
		 * Validate we've received only at least 8 bytes, not that
		 * we've received the entire descriptor. The reasoning is:
		 * - The code only uses fields in the first 8 bytes, so
		 *   that's all we need to have fetched at this stage.
		 * - The smallest maxpacket size is 8 bytes. Before we know
		 *   the actual maxpacket the device uses, the USB controller
		 *   may only accept a single packet. Consequently we are only
		 *   guaranteed to receive 1 packet (at least 8 bytes) even in
		 *   a non-error case.
		 *
		 * At least the DWC2 controller needs to be programmed with
		 * the number of packets in addition to the number of bytes.
		 * A request for 64 bytes of data with the maxpacket guessed
		 * as 64 (above) yields a request for 1 packet.
		 */
		err = get_descriptor_len(dev, 64, 8);
		if (err)
			return err;
	}

	dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
	dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
	switch (dev->descriptor.bMaxPacketSize0) {
	case 8:
		dev->maxpacketsize  = PACKET_SIZE_8;
		break;
	case 16:
		dev->maxpacketsize = PACKET_SIZE_16;
		break;
	case 32:
		dev->maxpacketsize = PACKET_SIZE_32;
		break;
	case 64:
		dev->maxpacketsize = PACKET_SIZE_64;
		break;
	default:
		printf("%s: invalid max packet size\n", __func__);
		return -EIO;
	}

	return 0;
}

static int usb_prepare_device(struct usb_device *dev, int addr, bool do_read,
			      struct usb_device *parent)
{
	int err;

	/*
	 * Allocate usb 3.0 device context.
	 * USB 3.0 (xHCI) protocol tries to allocate device slot
	 * and related data structures first. This call does that.
	 * Refer to sec 4.3.2 in xHCI spec rev1.0
	 */
	err = usb_alloc_device(dev);
	if (err) {
		printf("Cannot allocate device context to get SLOT_ID\n");
		return err;
	}
	err = usb_setup_descriptor(dev, do_read);
	if (err)
		return err;
	err = usb_hub_port_reset(dev, parent);
	if (err)
		return err;

	dev->devnum = addr;

	err = usb_set_address(dev); /* set address */

	if (err < 0) {
		printf("\n      USB device not accepting new address " \
			"(error=%lX)\n", dev->status);
		return err;
	}

	mdelay(10);	/* Let the SET_ADDRESS settle */

	/*
	 * If we haven't read device descriptor before, read it here
	 * after device is assigned an address. This is only applicable
	 * to xHCI so far.
	 */
	if (!do_read) {
		err = usb_setup_descriptor(dev, true);
		if (err)
			return err;
	}

	return 0;
}

int usb_select_config(struct usb_device *dev)
{
	unsigned char *tmpbuf = NULL;
	int err;

	err = get_descriptor_len(dev, USB_DT_DEVICE_SIZE, USB_DT_DEVICE_SIZE);
	if (err)
		return err;

	/* correct le values */
	le16_to_cpus(&dev->descriptor.bcdUSB);
	le16_to_cpus(&dev->descriptor.idVendor);
	le16_to_cpus(&dev->descriptor.idProduct);
	le16_to_cpus(&dev->descriptor.bcdDevice);

	/*
	 * Kingston DT Ultimate 32GB USB 3.0 seems to be extremely sensitive
	 * about this first Get Descriptor request. If there are any other
	 * requests in the first microframe, the stick crashes. Wait about
	 * one microframe duration here (1mS for USB 1.x , 125uS for USB 2.0).
	 */
	mdelay(1);

	/* only support for one config for now */
	err = usb_get_configuration_len(dev, 0);
	if (err >= 0) {
		tmpbuf = (unsigned char *)malloc_cache_aligned(err);
		if (!tmpbuf)
			err = -ENOMEM;
		else
			err = usb_get_configuration_no(dev, 0, tmpbuf, err);
	}
	if (err < 0) {
		printf("usb_new_device: Cannot read configuration, " \
		       "skipping device %04x:%04x\n",
		       dev->descriptor.idVendor, dev->descriptor.idProduct);
		free(tmpbuf);
		return err;
	}
	usb_parse_config(dev, tmpbuf, 0);
	free(tmpbuf);
	usb_set_maxpacket(dev);
	/*
	 * we set the default configuration here
	 * This seems premature. If the driver wants a different configuration
	 * it will need to select itself.
	 */
	err = usb_set_configuration(dev, dev->config.desc.bConfigurationValue);
	if (err < 0) {
		printf("failed to set default configuration " \
			"len %d, status %lX\n", dev->act_len, dev->status);
		return err;
	}

	/*
	 * Wait until the Set Configuration request gets processed by the
	 * device. This is required by at least SanDisk Cruzer Pop USB 2.0
	 * and Kingston DT Ultimate 32GB USB 3.0 on DWC2 OTG controller.
	 */
	mdelay(10);

	debug("new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
	      dev->descriptor.iManufacturer, dev->descriptor.iProduct,
	      dev->descriptor.iSerialNumber);
	memset(dev->mf, 0, sizeof(dev->mf));
	memset(dev->prod, 0, sizeof(dev->prod));
	memset(dev->serial, 0, sizeof(dev->serial));
	if (dev->descriptor.iManufacturer)
		usb_string(dev, dev->descriptor.iManufacturer,
			   dev->mf, sizeof(dev->mf));
	if (dev->descriptor.iProduct)
		usb_string(dev, dev->descriptor.iProduct,
			   dev->prod, sizeof(dev->prod));
	if (dev->descriptor.iSerialNumber)
		usb_string(dev, dev->descriptor.iSerialNumber,
			   dev->serial, sizeof(dev->serial));
	debug("Manufacturer %s\n", dev->mf);
	debug("Product      %s\n", dev->prod);
	debug("SerialNumber %s\n", dev->serial);

	return 0;
}

int usb_setup_device(struct usb_device *dev, bool do_read,
		     struct usb_device *parent)
{
	int addr;
	int ret;

	/* We still haven't set the Address yet */
	addr = dev->devnum;
	dev->devnum = 0;

	ret = usb_prepare_device(dev, addr, do_read, parent);
	if (ret)
		return ret;
	ret = usb_select_config(dev);

	return ret;
}

#if !CONFIG_IS_ENABLED(DM_USB)
/*
 * By the time we get here, the device has gotten a new device ID
 * and is in the default state. We need to identify the thing and
 * get the ball rolling..
 *
 * Returns 0 for success, != 0 for error.
 */
int usb_new_device(struct usb_device *dev)
{
	bool do_read = true;
	int err;

	/*
	 * XHCI needs to issue a Address device command to setup
	 * proper device context structures, before it can interact
	 * with the device. So a get_descriptor will fail before any
	 * of that is done for XHCI unlike EHCI.
	 */
#ifdef CONFIG_USB_XHCI_HCD
	do_read = false;
#endif
	err = usb_setup_device(dev, do_read, dev->parent);
	if (err)
		return err;

	/* Now probe if the device is a hub */
	err = usb_hub_probe(dev, 0);
	if (err < 0)
		return err;

	return 0;
}
#endif

__weak
int board_usb_init(int index, enum usb_init_type init)
{
	return 0;
}

__weak
int board_usb_cleanup(int index, enum usb_init_type init)
{
	return 0;
}

bool usb_device_has_child_on_port(struct usb_device *parent, int port)
{
#if CONFIG_IS_ENABLED(DM_USB)
	return false;
#else
	return parent->children[port] != NULL;
#endif
}

#if CONFIG_IS_ENABLED(DM_USB)
void usb_find_usb2_hub_address_port(struct usb_device *udev,
			       uint8_t *hub_address, uint8_t *hub_port)
{
	struct udevice *parent;
	struct usb_device *uparent, *ttdev;

	/*
	 * When called from usb-uclass.c: usb_scan_device() udev->dev points
	 * to the parent udevice, not the actual udevice belonging to the
	 * udev as the device is not instantiated yet. So when searching
	 * for the first usb-2 parent start with udev->dev not
	 * udev->dev->parent .
	 */
	ttdev = udev;
	parent = udev->dev;
	uparent = dev_get_parent_priv(parent);

	while (uparent->speed != USB_SPEED_HIGH) {
		struct udevice *dev = parent;

		if (device_get_uclass_id(dev->parent) != UCLASS_USB_HUB) {
			printf("Error: Cannot find high speed parent of usb-1 device\n");
			*hub_address = 0;
			*hub_port = 0;
			return;
		}

		ttdev = dev_get_parent_priv(dev);
		parent = dev->parent;
		uparent = dev_get_parent_priv(parent);
	}
	*hub_address = uparent->devnum;
	*hub_port = ttdev->portnr;
}
#else
void usb_find_usb2_hub_address_port(struct usb_device *udev,
			       uint8_t *hub_address, uint8_t *hub_port)
{
	/* Find out the nearest parent which is high speed */
	while (udev->parent->parent != NULL)
		if (udev->parent->speed != USB_SPEED_HIGH) {
			udev = udev->parent;
		} else {
			*hub_address = udev->parent->devnum;
			*hub_port = udev->portnr;
			return;
		}

	printf("Error: Cannot find high speed parent of usb-1 device\n");
	*hub_address = 0;
	*hub_port = 0;
}
#endif


/* EOF */