aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/gadget/udc/aspeed-vhub/hub.c
blob: 6497185ec4e7ab822cec2651385f64b1981fcdcb (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget
 *
 * hub.c - virtual hub handling
 *
 * Copyright 2017 IBM Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/prefetch.h>
#include <linux/clk.h>
#include <linux/usb/gadget.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <linux/dma-mapping.h>
#include <linux/bcd.h>
#include <linux/version.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>

#include "vhub.h"

/* usb 2.0 hub device descriptor
 *
 * A few things we may want to improve here:
 *
 *    - We may need to indicate TT support
 *    - We may need a device qualifier descriptor
 *	as devices can pretend to be usb1 or 2
 *    - Make vid/did overridable
 *    - make it look like usb1 if usb1 mode forced
 */
#define KERNEL_REL	bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff))
#define KERNEL_VER	bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff))

enum {
	AST_VHUB_STR_INDEX_MAX = 4,
	AST_VHUB_STR_MANUF = 3,
	AST_VHUB_STR_PRODUCT = 2,
	AST_VHUB_STR_SERIAL = 1,
};

static const struct usb_device_descriptor ast_vhub_dev_desc = {
	.bLength		= USB_DT_DEVICE_SIZE,
	.bDescriptorType	= USB_DT_DEVICE,
	.bcdUSB			= cpu_to_le16(0x0200),
	.bDeviceClass		= USB_CLASS_HUB,
	.bDeviceSubClass	= 0,
	.bDeviceProtocol	= 1,
	.bMaxPacketSize0	= 64,
	.idVendor		= cpu_to_le16(0x1d6b),
	.idProduct		= cpu_to_le16(0x0107),
	.bcdDevice		= cpu_to_le16(0x0100),
	.iManufacturer		= AST_VHUB_STR_MANUF,
	.iProduct		= AST_VHUB_STR_PRODUCT,
	.iSerialNumber		= AST_VHUB_STR_SERIAL,
	.bNumConfigurations	= 1,
};

/*
 * Configuration descriptor: same comments as above
 * regarding handling USB1 mode.
 */

/*
 * We don't use sizeof() as Linux definition of
 * struct usb_endpoint_descriptor contains 2
 * extra bytes
 */
#define AST_VHUB_CONF_DESC_SIZE	(USB_DT_CONFIG_SIZE + \
				 USB_DT_INTERFACE_SIZE + \
				 USB_DT_ENDPOINT_SIZE)

static const struct ast_vhub_full_cdesc ast_vhub_conf_desc = {
	.cfg = {
		.bLength		= USB_DT_CONFIG_SIZE,
		.bDescriptorType	= USB_DT_CONFIG,
		.wTotalLength		= cpu_to_le16(AST_VHUB_CONF_DESC_SIZE),
		.bNumInterfaces		= 1,
		.bConfigurationValue	= 1,
		.iConfiguration		= 0,
		.bmAttributes		= USB_CONFIG_ATT_ONE |
					  USB_CONFIG_ATT_SELFPOWER |
					  USB_CONFIG_ATT_WAKEUP,
		.bMaxPower		= 0,
	},
	.intf = {
		.bLength		= USB_DT_INTERFACE_SIZE,
		.bDescriptorType	= USB_DT_INTERFACE,
		.bInterfaceNumber	= 0,
		.bAlternateSetting	= 0,
		.bNumEndpoints		= 1,
		.bInterfaceClass	= USB_CLASS_HUB,
		.bInterfaceSubClass	= 0,
		.bInterfaceProtocol	= 0,
		.iInterface		= 0,
	},
	.ep = {
		.bLength		= USB_DT_ENDPOINT_SIZE,
		.bDescriptorType	= USB_DT_ENDPOINT,
		.bEndpointAddress	= 0x81,
		.bmAttributes		= USB_ENDPOINT_XFER_INT,
		.wMaxPacketSize		= cpu_to_le16(1),
		.bInterval		= 0x0c,
	},
};

#define AST_VHUB_HUB_DESC_SIZE	(USB_DT_HUB_NONVAR_SIZE + 2)

static const struct usb_hub_descriptor ast_vhub_hub_desc = {
	.bDescLength			= AST_VHUB_HUB_DESC_SIZE,
	.bDescriptorType		= USB_DT_HUB,
	.bNbrPorts			= AST_VHUB_NUM_PORTS,
	.wHubCharacteristics		= cpu_to_le16(HUB_CHAR_NO_LPSM),
	.bPwrOn2PwrGood			= 10,
	.bHubContrCurrent		= 0,
	.u.hs.DeviceRemovable[0]	= 0,
	.u.hs.DeviceRemovable[1]	= 0xff,
};

/*
 * These strings converted to UTF-16 must be smaller than
 * our EP0 buffer.
 */
static const struct usb_string ast_vhub_str_array[] = {
	{
		.id = AST_VHUB_STR_SERIAL,
		.s = "00000000"
	},
	{
		.id = AST_VHUB_STR_PRODUCT,
		.s = "USB Virtual Hub"
	},
	{
		.id = AST_VHUB_STR_MANUF,
		.s = "Aspeed"
	},
	{ }
};

static const struct usb_gadget_strings ast_vhub_strings = {
	.language = 0x0409,
	.strings = (struct usb_string *)ast_vhub_str_array
};

static int ast_vhub_hub_dev_status(struct ast_vhub_ep *ep,
				   u16 wIndex, u16 wValue)
{
	u8 st0;

	EPDBG(ep, "GET_STATUS(dev)\n");

	/*
	 * Mark it as self-powered, I doubt the BMC is powered off
	 * the USB bus ...
	 */
	st0 = 1 << USB_DEVICE_SELF_POWERED;

	/*
	 * Need to double check how remote wakeup actually works
	 * on that chip and what triggers it.
	 */
	if (ep->vhub->wakeup_en)
		st0 |= 1 << USB_DEVICE_REMOTE_WAKEUP;

	return ast_vhub_simple_reply(ep, st0, 0);
}

static int ast_vhub_hub_ep_status(struct ast_vhub_ep *ep,
				  u16 wIndex, u16 wValue)
{
	int ep_num;
	u8 st0 = 0;

	ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK;
	EPDBG(ep, "GET_STATUS(ep%d)\n", ep_num);

	/* On the hub we have only EP 0 and 1 */
	if (ep_num == 1) {
		if (ep->vhub->ep1_stalled)
			st0 |= 1 << USB_ENDPOINT_HALT;
	} else if (ep_num != 0)
		return std_req_stall;

	return ast_vhub_simple_reply(ep, st0, 0);
}

static int ast_vhub_hub_dev_feature(struct ast_vhub_ep *ep,
				    u16 wIndex, u16 wValue,
				    bool is_set)
{
	EPDBG(ep, "%s_FEATURE(dev val=%02x)\n",
	      is_set ? "SET" : "CLEAR", wValue);

	if (wValue != USB_DEVICE_REMOTE_WAKEUP)
		return std_req_stall;

	ep->vhub->wakeup_en = is_set;
	EPDBG(ep, "Hub remote wakeup %s\n",
	      is_set ? "enabled" : "disabled");

	return std_req_complete;
}

static int ast_vhub_hub_ep_feature(struct ast_vhub_ep *ep,
				   u16 wIndex, u16 wValue,
				   bool is_set)
{
	int ep_num;
	u32 reg;

	ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK;
	EPDBG(ep, "%s_FEATURE(ep%d val=%02x)\n",
	      is_set ? "SET" : "CLEAR", ep_num, wValue);

	if (ep_num > 1)
		return std_req_stall;
	if (wValue != USB_ENDPOINT_HALT)
		return std_req_stall;
	if (ep_num == 0)
		return std_req_complete;

	EPDBG(ep, "%s stall on EP 1\n",
	      is_set ? "setting" : "clearing");

	ep->vhub->ep1_stalled = is_set;
	reg = readl(ep->vhub->regs + AST_VHUB_EP1_CTRL);
	if (is_set) {
		reg |= VHUB_EP1_CTRL_STALL;
	} else {
		reg &= ~VHUB_EP1_CTRL_STALL;
		reg |= VHUB_EP1_CTRL_RESET_TOGGLE;
	}
	writel(reg, ep->vhub->regs + AST_VHUB_EP1_CTRL);

	return std_req_complete;
}

static int ast_vhub_rep_desc(struct ast_vhub_ep *ep,
			     u8 desc_type, u16 len)
{
	size_t dsize;
	struct ast_vhub *vhub = ep->vhub;

	EPDBG(ep, "GET_DESCRIPTOR(type:%d)\n", desc_type);

	/*
	 * Copy first to EP buffer and send from there, so
	 * we can do some in-place patching if needed. We know
	 * the EP buffer is big enough but ensure that doesn't
	 * change. We do that now rather than later after we
	 * have checked sizes etc... to avoid a gcc bug where
	 * it thinks len is constant and barfs about read
	 * overflows in memcpy.
	 */
	switch(desc_type) {
	case USB_DT_DEVICE:
		dsize = USB_DT_DEVICE_SIZE;
		memcpy(ep->buf, &vhub->vhub_dev_desc, dsize);
		BUILD_BUG_ON(dsize > sizeof(vhub->vhub_dev_desc));
		BUILD_BUG_ON(USB_DT_DEVICE_SIZE >= AST_VHUB_EP0_MAX_PACKET);
		break;
	case USB_DT_CONFIG:
		dsize = AST_VHUB_CONF_DESC_SIZE;
		memcpy(ep->buf, &vhub->vhub_conf_desc, dsize);
		BUILD_BUG_ON(dsize > sizeof(vhub->vhub_conf_desc));
		BUILD_BUG_ON(AST_VHUB_CONF_DESC_SIZE >= AST_VHUB_EP0_MAX_PACKET);
		break;
	case USB_DT_HUB:
		dsize = AST_VHUB_HUB_DESC_SIZE;
		memcpy(ep->buf, &vhub->vhub_hub_desc, dsize);
		BUILD_BUG_ON(dsize > sizeof(vhub->vhub_hub_desc));
		BUILD_BUG_ON(AST_VHUB_HUB_DESC_SIZE >= AST_VHUB_EP0_MAX_PACKET);
		break;
	default:
		return std_req_stall;
	}

	/* Crop requested length */
	if (len > dsize)
		len = dsize;

	/* Shoot it from the EP buffer */
	return ast_vhub_reply(ep, NULL, len);
}

static struct usb_gadget_strings*
ast_vhub_str_of_container(struct usb_gadget_string_container *container)
{
	return (struct usb_gadget_strings *)container->stash;
}

static int ast_vhub_collect_languages(struct ast_vhub *vhub, void *buf,
				      size_t size)
{
	int rc, hdr_len, nlangs, max_langs;
	struct usb_gadget_strings *lang_str;
	struct usb_gadget_string_container *container;
	struct usb_string_descriptor *sdesc = buf;

	nlangs = 0;
	hdr_len = sizeof(struct usb_descriptor_header);
	max_langs = (size - hdr_len) / sizeof(sdesc->wData[0]);
	list_for_each_entry(container, &vhub->vhub_str_desc, list) {
		if (nlangs >= max_langs)
			break;

		lang_str = ast_vhub_str_of_container(container);
		sdesc->wData[nlangs++] = cpu_to_le16(lang_str->language);
	}

	rc = hdr_len + nlangs * sizeof(sdesc->wData[0]);
	sdesc->bLength = rc;
	sdesc->bDescriptorType = USB_DT_STRING;

	return rc;
}

static struct usb_gadget_strings *ast_vhub_lookup_string(struct ast_vhub *vhub,
							 u16 lang_id)
{
	struct usb_gadget_strings *lang_str;
	struct usb_gadget_string_container *container;

	list_for_each_entry(container, &vhub->vhub_str_desc, list) {
		lang_str = ast_vhub_str_of_container(container);
		if (lang_str->language == lang_id)
			return lang_str;
	}

	return NULL;
}

static int ast_vhub_rep_string(struct ast_vhub_ep *ep,
			       u8 string_id, u16 lang_id,
			       u16 len)
{
	int rc;
	u8 buf[256];
	struct ast_vhub *vhub = ep->vhub;
	struct usb_gadget_strings *lang_str;

	if (string_id == 0) {
		rc = ast_vhub_collect_languages(vhub, buf, sizeof(buf));
	} else {
		lang_str = ast_vhub_lookup_string(vhub, lang_id);
		if (!lang_str)
			return std_req_stall;

		rc = usb_gadget_get_string(lang_str, string_id, buf);
	}

	if (rc < 0 || rc >= AST_VHUB_EP0_MAX_PACKET)
		return std_req_stall;

	/* Shoot it from the EP buffer */
	memcpy(ep->buf, buf, rc);
	return ast_vhub_reply(ep, NULL, min_t(u16, rc, len));
}

enum std_req_rc ast_vhub_std_hub_request(struct ast_vhub_ep *ep,
					 struct usb_ctrlrequest *crq)
{
	struct ast_vhub *vhub = ep->vhub;
	u16 wValue, wIndex, wLength;

	wValue = le16_to_cpu(crq->wValue);
	wIndex = le16_to_cpu(crq->wIndex);
	wLength = le16_to_cpu(crq->wLength);

	/* First packet, grab speed */
	if (vhub->speed == USB_SPEED_UNKNOWN) {
		u32 ustat = readl(vhub->regs + AST_VHUB_USBSTS);
		if (ustat & VHUB_USBSTS_HISPEED)
			vhub->speed = USB_SPEED_HIGH;
		else
			vhub->speed = USB_SPEED_FULL;
		UDCDBG(vhub, "USB status=%08x speed=%s\n", ustat,
		       vhub->speed == USB_SPEED_HIGH ? "high" : "full");
	}

	switch ((crq->bRequestType << 8) | crq->bRequest) {
		/* SET_ADDRESS */
	case DeviceOutRequest | USB_REQ_SET_ADDRESS:
		EPDBG(ep, "SET_ADDRESS: Got address %x\n", wValue);
		writel(wValue, vhub->regs + AST_VHUB_CONF);
		return std_req_complete;

		/* GET_STATUS */
	case DeviceRequest | USB_REQ_GET_STATUS:
		return ast_vhub_hub_dev_status(ep, wIndex, wValue);
	case InterfaceRequest | USB_REQ_GET_STATUS:
		return ast_vhub_simple_reply(ep, 0, 0);
	case EndpointRequest | USB_REQ_GET_STATUS:
		return ast_vhub_hub_ep_status(ep, wIndex, wValue);

		/* SET/CLEAR_FEATURE */
	case DeviceOutRequest | USB_REQ_SET_FEATURE:
		return ast_vhub_hub_dev_feature(ep, wIndex, wValue, true);
	case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
		return ast_vhub_hub_dev_feature(ep, wIndex, wValue, false);
	case EndpointOutRequest | USB_REQ_SET_FEATURE:
		return ast_vhub_hub_ep_feature(ep, wIndex, wValue, true);
	case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
		return ast_vhub_hub_ep_feature(ep, wIndex, wValue, false);

		/* GET/SET_CONFIGURATION */
	case DeviceRequest | USB_REQ_GET_CONFIGURATION:
		return ast_vhub_simple_reply(ep, 1);
	case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
		if (wValue != 1)
			return std_req_stall;
		return std_req_complete;

		/* GET_DESCRIPTOR */
	case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
		switch (wValue >> 8) {
		case USB_DT_DEVICE:
		case USB_DT_CONFIG:
			return ast_vhub_rep_desc(ep, wValue >> 8,
						 wLength);
		case USB_DT_STRING:
			return ast_vhub_rep_string(ep, wValue & 0xff,
						   wIndex, wLength);
		}
		return std_req_stall;

		/* GET/SET_INTERFACE */
	case DeviceRequest | USB_REQ_GET_INTERFACE:
		return ast_vhub_simple_reply(ep, 0);
	case DeviceOutRequest | USB_REQ_SET_INTERFACE:
		if (wValue != 0 || wIndex != 0)
			return std_req_stall;
		return std_req_complete;
	}
	return std_req_stall;
}

static void ast_vhub_update_hub_ep1(struct ast_vhub *vhub,
				    unsigned int port)
{
	/* Update HW EP1 response */
	u32 reg = readl(vhub->regs + AST_VHUB_EP1_STS_CHG);
	u32 pmask = (1 << (port + 1));
	if (vhub->ports[port].change)
		reg |= pmask;
	else
		reg &= ~pmask;
	writel(reg, vhub->regs + AST_VHUB_EP1_STS_CHG);
}

static void ast_vhub_change_port_stat(struct ast_vhub *vhub,
				      unsigned int port,
				      u16 clr_flags,
				      u16 set_flags,
				      bool set_c)
{
	struct ast_vhub_port *p = &vhub->ports[port];
	u16 prev;

	/* Update port status */
	prev = p->status;
	p->status = (prev & ~clr_flags) | set_flags;
	DDBG(&p->dev, "port %d status %04x -> %04x (C=%d)\n",
	     port + 1, prev, p->status, set_c);

	/* Update change bits if needed */
	if (set_c) {
		u16 chg = p->status ^ prev;

		/* Only these are relevant for change */
		chg &= USB_PORT_STAT_C_CONNECTION |
		       USB_PORT_STAT_C_ENABLE |
		       USB_PORT_STAT_C_SUSPEND |
		       USB_PORT_STAT_C_OVERCURRENT |
		       USB_PORT_STAT_C_RESET |
		       USB_PORT_STAT_C_L1;

		/*
		 * We only set USB_PORT_STAT_C_ENABLE if we are disabling
		 * the port as per USB spec, otherwise MacOS gets upset
		 */
		if (p->status & USB_PORT_STAT_ENABLE)
			chg &= ~USB_PORT_STAT_C_ENABLE;

		p->change = chg;
		ast_vhub_update_hub_ep1(vhub, port);
	}
}

static void ast_vhub_send_host_wakeup(struct ast_vhub *vhub)
{
	u32 reg = readl(vhub->regs + AST_VHUB_CTRL);
	UDCDBG(vhub, "Waking up host !\n");
	reg |= VHUB_CTRL_MANUAL_REMOTE_WAKEUP;
	writel(reg, vhub->regs + AST_VHUB_CTRL);
}

void ast_vhub_device_connect(struct ast_vhub *vhub,
			     unsigned int port, bool on)
{
	if (on)
		ast_vhub_change_port_stat(vhub, port, 0,
					  USB_PORT_STAT_CONNECTION, true);
	else
		ast_vhub_change_port_stat(vhub, port,
					  USB_PORT_STAT_CONNECTION |
					  USB_PORT_STAT_ENABLE,
					  0, true);

	/*
	 * If the hub is set to wakup the host on connection events
	 * then send a wakeup.
	 */
	if (vhub->wakeup_en)
		ast_vhub_send_host_wakeup(vhub);
}

static void ast_vhub_wake_work(struct work_struct *work)
{
	struct ast_vhub *vhub = container_of(work,
					     struct ast_vhub,
					     wake_work);
	unsigned long flags;
	unsigned int i;

	/*
	 * Wake all sleeping ports. If a port is suspended by
	 * the host suspend (without explicit state suspend),
	 * we let the normal host wake path deal with it later.
	 */
	spin_lock_irqsave(&vhub->lock, flags);
	for (i = 0; i < vhub->max_ports; i++) {
		struct ast_vhub_port *p = &vhub->ports[i];

		if (!(p->status & USB_PORT_STAT_SUSPEND))
			continue;
		ast_vhub_change_port_stat(vhub, i,
					  USB_PORT_STAT_SUSPEND,
					  0, true);
		ast_vhub_dev_resume(&p->dev);
	}
	ast_vhub_send_host_wakeup(vhub);
	spin_unlock_irqrestore(&vhub->lock, flags);
}

void ast_vhub_hub_wake_all(struct ast_vhub *vhub)
{
	/*
	 * A device is trying to wake the world, because this
	 * can recurse into the device, we break the call chain
	 * using a work queue
	 */
	schedule_work(&vhub->wake_work);
}

static void ast_vhub_port_reset(struct ast_vhub *vhub, u8 port)
{
	struct ast_vhub_port *p = &vhub->ports[port];
	u16 set, clr, speed;

	/* First mark disabled */
	ast_vhub_change_port_stat(vhub, port,
				  USB_PORT_STAT_ENABLE |
				  USB_PORT_STAT_SUSPEND,
				  USB_PORT_STAT_RESET,
				  false);

	if (!p->dev.driver)
		return;

	/*
	 * This will either "start" the port or reset the
	 * device if already started...
	 */
	ast_vhub_dev_reset(&p->dev);

	/* Grab the right speed */
	speed = p->dev.driver->max_speed;
	if (speed == USB_SPEED_UNKNOWN || speed > vhub->speed)
		speed = vhub->speed;

	switch (speed) {
	case USB_SPEED_LOW:
		set = USB_PORT_STAT_LOW_SPEED;
		clr = USB_PORT_STAT_HIGH_SPEED;
		break;
	case USB_SPEED_FULL:
		set = 0;
		clr = USB_PORT_STAT_LOW_SPEED |
			USB_PORT_STAT_HIGH_SPEED;
		break;
	case USB_SPEED_HIGH:
		set = USB_PORT_STAT_HIGH_SPEED;
		clr = USB_PORT_STAT_LOW_SPEED;
		break;
	default:
		UDCDBG(vhub, "Unsupported speed %d when"
		       " connecting device\n",
		       speed);
		return;
	}
	clr |= USB_PORT_STAT_RESET;
	set |= USB_PORT_STAT_ENABLE;

	/* This should ideally be delayed ... */
	ast_vhub_change_port_stat(vhub, port, clr, set, true);
}

static enum std_req_rc ast_vhub_set_port_feature(struct ast_vhub_ep *ep,
						 u8 port, u16 feat)
{
	struct ast_vhub *vhub = ep->vhub;
	struct ast_vhub_port *p;

	if (port == 0 || port > vhub->max_ports)
		return std_req_stall;
	port--;
	p = &vhub->ports[port];

	switch(feat) {
	case USB_PORT_FEAT_SUSPEND:
		if (!(p->status & USB_PORT_STAT_ENABLE))
			return std_req_complete;
		ast_vhub_change_port_stat(vhub, port,
					  0, USB_PORT_STAT_SUSPEND,
					  false);
		ast_vhub_dev_suspend(&p->dev);
		return std_req_complete;
	case USB_PORT_FEAT_RESET:
		EPDBG(ep, "Port reset !\n");
		ast_vhub_port_reset(vhub, port);
		return std_req_complete;
	case USB_PORT_FEAT_POWER:
		/*
		 * On Power-on, we mark the connected flag changed,
		 * if there's a connected device, some hosts will
		 * otherwise fail to detect it.
		 */
		if (p->status & USB_PORT_STAT_CONNECTION) {
			p->change |= USB_PORT_STAT_C_CONNECTION;
			ast_vhub_update_hub_ep1(vhub, port);
		}
		return std_req_complete;
	case USB_PORT_FEAT_TEST:
	case USB_PORT_FEAT_INDICATOR:
		/* We don't do anything with these */
		return std_req_complete;
	}
	return std_req_stall;
}

static enum std_req_rc ast_vhub_clr_port_feature(struct ast_vhub_ep *ep,
						 u8 port, u16 feat)
{
	struct ast_vhub *vhub = ep->vhub;
	struct ast_vhub_port *p;

	if (port == 0 || port > vhub->max_ports)
		return std_req_stall;
	port--;
	p = &vhub->ports[port];

	switch(feat) {
	case USB_PORT_FEAT_ENABLE:
		ast_vhub_change_port_stat(vhub, port,
					  USB_PORT_STAT_ENABLE |
					  USB_PORT_STAT_SUSPEND, 0,
					  false);
		ast_vhub_dev_suspend(&p->dev);
		return std_req_complete;
	case USB_PORT_FEAT_SUSPEND:
		if (!(p->status & USB_PORT_STAT_SUSPEND))
			return std_req_complete;
		ast_vhub_change_port_stat(vhub, port,
					  USB_PORT_STAT_SUSPEND, 0,
					  false);
		ast_vhub_dev_resume(&p->dev);
		return std_req_complete;
	case USB_PORT_FEAT_POWER:
		/* We don't do power control */
		return std_req_complete;
	case USB_PORT_FEAT_INDICATOR:
		/* We don't have indicators */
		return std_req_complete;
	case USB_PORT_FEAT_C_CONNECTION:
	case USB_PORT_FEAT_C_ENABLE:
	case USB_PORT_FEAT_C_SUSPEND:
	case USB_PORT_FEAT_C_OVER_CURRENT:
	case USB_PORT_FEAT_C_RESET:
		/* Clear state-change feature */
		p->change &= ~(1u << (feat - 16));
		ast_vhub_update_hub_ep1(vhub, port);
		return std_req_complete;
	}
	return std_req_stall;
}

static enum std_req_rc ast_vhub_get_port_stat(struct ast_vhub_ep *ep,
					      u8 port)
{
	struct ast_vhub *vhub = ep->vhub;
	u16 stat, chg;

	if (port == 0 || port > vhub->max_ports)
		return std_req_stall;
	port--;

	stat = vhub->ports[port].status;
	chg = vhub->ports[port].change;

	/* We always have power */
	stat |= USB_PORT_STAT_POWER;

	EPDBG(ep, " port status=%04x change=%04x\n", stat, chg);

	return ast_vhub_simple_reply(ep,
				     stat & 0xff,
				     stat >> 8,
				     chg & 0xff,
				     chg >> 8);
}

enum std_req_rc ast_vhub_class_hub_request(struct ast_vhub_ep *ep,
					   struct usb_ctrlrequest *crq)
{
	u16 wValue, wIndex, wLength;

	wValue = le16_to_cpu(crq->wValue);
	wIndex = le16_to_cpu(crq->wIndex);
	wLength = le16_to_cpu(crq->wLength);

	switch ((crq->bRequestType << 8) | crq->bRequest) {
	case GetHubStatus:
		EPDBG(ep, "GetHubStatus\n");
		return ast_vhub_simple_reply(ep, 0, 0, 0, 0);
	case GetPortStatus:
		EPDBG(ep, "GetPortStatus(%d)\n", wIndex & 0xff);
		return ast_vhub_get_port_stat(ep, wIndex & 0xf);
	case GetHubDescriptor:
		if (wValue != (USB_DT_HUB << 8))
			return std_req_stall;
		EPDBG(ep, "GetHubDescriptor(%d)\n", wIndex & 0xff);
		return ast_vhub_rep_desc(ep, USB_DT_HUB, wLength);
	case SetHubFeature:
	case ClearHubFeature:
		EPDBG(ep, "Get/SetHubFeature(%d)\n", wValue);
		/* No feature, just complete the requests */
		if (wValue == C_HUB_LOCAL_POWER ||
		    wValue == C_HUB_OVER_CURRENT)
			return std_req_complete;
		return std_req_stall;
	case SetPortFeature:
		EPDBG(ep, "SetPortFeature(%d,%d)\n", wIndex & 0xf, wValue);
		return ast_vhub_set_port_feature(ep, wIndex & 0xf, wValue);
	case ClearPortFeature:
		EPDBG(ep, "ClearPortFeature(%d,%d)\n", wIndex & 0xf, wValue);
		return ast_vhub_clr_port_feature(ep, wIndex & 0xf, wValue);
	case ClearTTBuffer:
	case ResetTT:
	case StopTT:
		return std_req_complete;
	case GetTTState:
		return ast_vhub_simple_reply(ep, 0, 0, 0, 0);
	default:
		EPDBG(ep, "Unknown class request\n");
	}
	return std_req_stall;
}

void ast_vhub_hub_suspend(struct ast_vhub *vhub)
{
	unsigned int i;

	UDCDBG(vhub, "USB bus suspend\n");

	if (vhub->suspended)
		return;

	vhub->suspended = true;

	/*
	 * Forward to unsuspended ports without changing
	 * their connection status.
	 */
	for (i = 0; i < vhub->max_ports; i++) {
		struct ast_vhub_port *p = &vhub->ports[i];

		if (!(p->status & USB_PORT_STAT_SUSPEND))
			ast_vhub_dev_suspend(&p->dev);
	}
}

void ast_vhub_hub_resume(struct ast_vhub *vhub)
{
	unsigned int i;

	UDCDBG(vhub, "USB bus resume\n");

	if (!vhub->suspended)
		return;

	vhub->suspended = false;

	/*
	 * Forward to unsuspended ports without changing
	 * their connection status.
	 */
	for (i = 0; i < vhub->max_ports; i++) {
		struct ast_vhub_port *p = &vhub->ports[i];

		if (!(p->status & USB_PORT_STAT_SUSPEND))
			ast_vhub_dev_resume(&p->dev);
	}
}

void ast_vhub_hub_reset(struct ast_vhub *vhub)
{
	unsigned int i;

	UDCDBG(vhub, "USB bus reset\n");

	/*
	 * Is the speed known ? If not we don't care, we aren't
	 * initialized yet and ports haven't been enabled.
	 */
	if (vhub->speed == USB_SPEED_UNKNOWN)
		return;

	/* We aren't suspended anymore obviously */
	vhub->suspended = false;

	/* No speed set */
	vhub->speed = USB_SPEED_UNKNOWN;

	/* Wakeup not enabled anymore */
	vhub->wakeup_en = false;

	/*
	 * Clear all port status, disable gadgets and "suspend"
	 * them. They will be woken up by a port reset.
	 */
	for (i = 0; i < vhub->max_ports; i++) {
		struct ast_vhub_port *p = &vhub->ports[i];

		/* Only keep the connected flag */
		p->status &= USB_PORT_STAT_CONNECTION;
		p->change = 0;

		/* Suspend the gadget if any */
		ast_vhub_dev_suspend(&p->dev);
	}

	/* Cleanup HW */
	writel(0, vhub->regs + AST_VHUB_CONF);
	writel(0, vhub->regs + AST_VHUB_EP0_CTRL);
	writel(VHUB_EP1_CTRL_RESET_TOGGLE |
	       VHUB_EP1_CTRL_ENABLE,
	       vhub->regs + AST_VHUB_EP1_CTRL);
	writel(0, vhub->regs + AST_VHUB_EP1_STS_CHG);
}

static void ast_vhub_of_parse_dev_desc(struct ast_vhub *vhub,
				       const struct device_node *vhub_np)
{
	u16 id;
	u32 data;

	if (!of_property_read_u32(vhub_np, "vhub-vendor-id", &data)) {
		id = (u16)data;
		vhub->vhub_dev_desc.idVendor = cpu_to_le16(id);
	}
	if (!of_property_read_u32(vhub_np, "vhub-product-id", &data)) {
		id = (u16)data;
		vhub->vhub_dev_desc.idProduct = cpu_to_le16(id);
	}
	if (!of_property_read_u32(vhub_np, "vhub-device-revision", &data)) {
		id = (u16)data;
		vhub->vhub_dev_desc.bcdDevice = cpu_to_le16(id);
	}
}

static void ast_vhub_fixup_usb1_dev_desc(struct ast_vhub *vhub)
{
	vhub->vhub_dev_desc.bcdUSB = cpu_to_le16(0x0100);
	vhub->vhub_dev_desc.bDeviceProtocol = 0;
}

static struct usb_gadget_string_container*
ast_vhub_str_container_alloc(struct ast_vhub *vhub)
{
	unsigned int size;
	struct usb_string *str_array;
	struct usb_gadget_strings *lang_str;
	struct usb_gadget_string_container *container;

	size = sizeof(*container);
	size += sizeof(struct usb_gadget_strings);
	size += sizeof(struct usb_string) * AST_VHUB_STR_INDEX_MAX;
	container = devm_kzalloc(&vhub->pdev->dev, size, GFP_KERNEL);
	if (!container)
		return ERR_PTR(-ENOMEM);

	lang_str = ast_vhub_str_of_container(container);
	str_array = (struct usb_string *)(lang_str + 1);
	lang_str->strings = str_array;
	return container;
}

static void ast_vhub_str_deep_copy(struct usb_gadget_strings *dest,
				   const struct usb_gadget_strings *src)
{
	struct usb_string *src_array = src->strings;
	struct usb_string *dest_array = dest->strings;

	dest->language = src->language;
	if (src_array && dest_array) {
		do {
			*dest_array = *src_array;
			dest_array++;
			src_array++;
		} while (src_array->s);
	}
}

static int ast_vhub_str_alloc_add(struct ast_vhub *vhub,
				  const struct usb_gadget_strings *src_str)
{
	struct usb_gadget_strings *dest_str;
	struct usb_gadget_string_container *container;

	container = ast_vhub_str_container_alloc(vhub);
	if (IS_ERR(container))
		return PTR_ERR(container);

	dest_str = ast_vhub_str_of_container(container);
	ast_vhub_str_deep_copy(dest_str, src_str);
	list_add_tail(&container->list, &vhub->vhub_str_desc);

	return 0;
}

static const struct {
	const char *name;
	u8 id;
} str_id_map[] = {
	{"manufacturer",	AST_VHUB_STR_MANUF},
	{"product",		AST_VHUB_STR_PRODUCT},
	{"serial-number",	AST_VHUB_STR_SERIAL},
	{},
};

static int ast_vhub_of_parse_str_desc(struct ast_vhub *vhub,
				      const struct device_node *desc_np)
{
	u32 langid;
	int ret = 0;
	int i, offset;
	const char *str;
	struct device_node *child;
	struct usb_string str_array[AST_VHUB_STR_INDEX_MAX];
	struct usb_gadget_strings lang_str = {
		.strings = (struct usb_string *)str_array,
	};

	for_each_child_of_node(desc_np, child) {
		if (of_property_read_u32(child, "reg", &langid))
			continue; /* no language identifier specified */

		if (!usb_validate_langid(langid))
			continue; /* invalid language identifier */

		lang_str.language = langid;
		for (i = offset = 0; str_id_map[i].name; i++) {
			str = of_get_property(child, str_id_map[i].name, NULL);
			if (str) {
				str_array[offset].s = str;
				str_array[offset].id = str_id_map[i].id;
				offset++;
			}
		}
		str_array[offset].id = 0;
		str_array[offset].s = NULL;

		ret = ast_vhub_str_alloc_add(vhub, &lang_str);
		if (ret)
			break;
	}

	return ret;
}

static int ast_vhub_init_desc(struct ast_vhub *vhub)
{
	int ret;
	struct device_node *desc_np;
	const struct device_node *vhub_np = vhub->pdev->dev.of_node;

	/* Initialize vhub Device Descriptor. */
	memcpy(&vhub->vhub_dev_desc, &ast_vhub_dev_desc,
		sizeof(vhub->vhub_dev_desc));
	ast_vhub_of_parse_dev_desc(vhub, vhub_np);
	if (vhub->force_usb1)
		ast_vhub_fixup_usb1_dev_desc(vhub);

	/* Initialize vhub Configuration Descriptor. */
	memcpy(&vhub->vhub_conf_desc, &ast_vhub_conf_desc,
		sizeof(vhub->vhub_conf_desc));

	/* Initialize vhub Hub Descriptor. */
	memcpy(&vhub->vhub_hub_desc, &ast_vhub_hub_desc,
		sizeof(vhub->vhub_hub_desc));
	vhub->vhub_hub_desc.bNbrPorts = vhub->max_ports;

	/* Initialize vhub String Descriptors. */
	INIT_LIST_HEAD(&vhub->vhub_str_desc);
	desc_np = of_get_child_by_name(vhub_np, "vhub-strings");
	if (desc_np)
		ret = ast_vhub_of_parse_str_desc(vhub, desc_np);
	else
		ret = ast_vhub_str_alloc_add(vhub, &ast_vhub_strings);

	return ret;
}

int ast_vhub_init_hub(struct ast_vhub *vhub)
{
	vhub->speed = USB_SPEED_UNKNOWN;
	INIT_WORK(&vhub->wake_work, ast_vhub_wake_work);

	return ast_vhub_init_desc(vhub);
}