summaryrefslogtreecommitdiff
path: root/drivers/usb/cdns3/ep0.c
blob: 4761c852d9c4b8bc686206669f3a72cefd229185 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Cadence USBSS DRD Driver - gadget side.
 *
 * Copyright (C) 2018 Cadence Design Systems.
 * Copyright (C) 2017-2018 NXP
 *
 * Authors: Pawel Jez <pjez@cadence.com>,
 *          Pawel Laszczak <pawell@cadence.com>
 *          Peter Chen <peter.chen@nxp.com>
 */

#include <linux/usb/composite.h>
#include <linux/iopoll.h>

#include "gadget.h"
#include "trace.h"

static struct usb_endpoint_descriptor cdns3_gadget_ep0_desc = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bmAttributes =	USB_ENDPOINT_XFER_CONTROL,
};

/**
 * cdns3_ep0_run_transfer - Do transfer on default endpoint hardware
 * @priv_dev: extended gadget object
 * @dma_addr: physical address where data is/will be stored
 * @length: data length
 * @erdy: set it to 1 when ERDY packet should be sent -
 *        exit from flow control state
 * @zlp: add zero length packet
 */
static void cdns3_ep0_run_transfer(struct cdns3_device *priv_dev,
				   dma_addr_t dma_addr,
				   unsigned int length, int erdy, int zlp)
{
	struct cdns3_usb_regs __iomem *regs = priv_dev->regs;
	struct cdns3_endpoint *priv_ep = priv_dev->eps[0];

	priv_ep->trb_pool[0].buffer = cpu_to_le32(TRB_BUFFER(dma_addr));
	priv_ep->trb_pool[0].length = cpu_to_le32(TRB_LEN(length));

	if (zlp) {
		priv_ep->trb_pool[0].control = cpu_to_le32(TRB_CYCLE | TRB_TYPE(TRB_NORMAL));
		priv_ep->trb_pool[1].buffer = cpu_to_le32(TRB_BUFFER(dma_addr));
		priv_ep->trb_pool[1].length = cpu_to_le32(TRB_LEN(0));
		priv_ep->trb_pool[1].control = cpu_to_le32(TRB_CYCLE | TRB_IOC |
		    TRB_TYPE(TRB_NORMAL));
	} else {
		priv_ep->trb_pool[0].control = cpu_to_le32(TRB_CYCLE | TRB_IOC |
		    TRB_TYPE(TRB_NORMAL));
		priv_ep->trb_pool[1].control = 0;
	}

	trace_cdns3_prepare_trb(priv_ep, priv_ep->trb_pool);

	cdns3_select_ep(priv_dev, priv_dev->ep0_data_dir);

	writel(EP_STS_TRBERR, &regs->ep_sts);
	writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma), &regs->ep_traddr);
	trace_cdns3_doorbell_ep0(priv_dev->ep0_data_dir ? "ep0in" : "ep0out",
				 readl(&regs->ep_traddr));

	/* TRB should be prepared before starting transfer. */
	writel(EP_CMD_DRDY, &regs->ep_cmd);

	/* Resume controller before arming transfer. */
	__cdns3_gadget_wakeup(priv_dev);

	if (erdy)
		writel(EP_CMD_ERDY, &priv_dev->regs->ep_cmd);
}

/**
 * cdns3_ep0_delegate_req - Returns status of handling setup packet
 * Setup is handled by gadget driver
 * @priv_dev: extended gadget object
 * @ctrl_req: pointer to received setup packet
 *
 * Returns zero on success or negative value on failure
 */
static int cdns3_ep0_delegate_req(struct cdns3_device *priv_dev,
				  struct usb_ctrlrequest *ctrl_req)
{
	int ret;

	spin_unlock(&priv_dev->lock);
	priv_dev->setup_pending = 1;
	ret = priv_dev->gadget_driver->setup(&priv_dev->gadget, ctrl_req);
	priv_dev->setup_pending = 0;
	spin_lock(&priv_dev->lock);
	return ret;
}

static void cdns3_prepare_setup_packet(struct cdns3_device *priv_dev)
{
	priv_dev->ep0_data_dir = 0;
	priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
	cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
			       sizeof(struct usb_ctrlrequest), 0, 0);
}

static void cdns3_ep0_complete_setup(struct cdns3_device *priv_dev,
				     u8 send_stall, u8 send_erdy)
{
	struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
	struct usb_request *request;

	request = cdns3_next_request(&priv_ep->pending_req_list);
	if (request)
		list_del_init(&request->list);

	if (send_stall) {
		trace_cdns3_halt(priv_ep, send_stall, 0);
		/* set_stall on ep0 */
		cdns3_select_ep(priv_dev, 0x00);
		writel(EP_CMD_SSTALL, &priv_dev->regs->ep_cmd);
	} else {
		cdns3_prepare_setup_packet(priv_dev);
	}

	priv_dev->ep0_stage = CDNS3_SETUP_STAGE;
	writel((send_erdy ? EP_CMD_ERDY : 0) | EP_CMD_REQ_CMPL,
	       &priv_dev->regs->ep_cmd);
}

/**
 * cdns3_req_ep0_set_configuration - Handling of SET_CONFIG standard USB request
 * @priv_dev: extended gadget object
 * @ctrl_req: pointer to received setup packet
 *
 * Returns 0 if success, USB_GADGET_DELAYED_STATUS on deferred status stage,
 * error code on error
 */
static int cdns3_req_ep0_set_configuration(struct cdns3_device *priv_dev,
					   struct usb_ctrlrequest *ctrl_req)
{
	enum usb_device_state device_state = priv_dev->gadget.state;
	struct cdns3_endpoint *priv_ep;
	u32 config = le16_to_cpu(ctrl_req->wValue);
	int result = 0;
	int i;

	switch (device_state) {
	case USB_STATE_ADDRESS:
		/* Configure non-control EPs */
		for (i = 0; i < CDNS3_ENDPOINTS_MAX_COUNT; i++) {
			priv_ep = priv_dev->eps[i];
			if (!priv_ep)
				continue;

			if (priv_ep->flags & EP_CLAIMED)
				cdns3_ep_config(priv_ep);
		}

		result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);

		if (result)
			return result;

		if (!config) {
			cdns3_hw_reset_eps_config(priv_dev);
			usb_gadget_set_state(&priv_dev->gadget,
					     USB_STATE_ADDRESS);
		}

		break;
	case USB_STATE_CONFIGURED:
		result = cdns3_ep0_delegate_req(priv_dev, ctrl_req);

		if (!config && !result) {
			cdns3_hw_reset_eps_config(priv_dev);
			usb_gadget_set_state(&priv_dev->gadget,
					     USB_STATE_ADDRESS);
		}
		break;
	default:
		result = -EINVAL;
	}

	return result;
}

/**
 * cdns3_req_ep0_set_address - Handling of SET_ADDRESS standard USB request
 * @priv_dev: extended gadget object
 * @ctrl_req: pointer to received setup packet
 *
 * Returns 0 if success, error code on error
 */
static int cdns3_req_ep0_set_address(struct cdns3_device *priv_dev,
				     struct usb_ctrlrequest *ctrl_req)
{
	enum usb_device_state device_state = priv_dev->gadget.state;
	u32 reg;
	u32 addr;

	addr = le16_to_cpu(ctrl_req->wValue);

	if (addr > USB_DEVICE_MAX_ADDRESS) {
		dev_err(priv_dev->dev,
			"Device address (%d) cannot be greater than %d\n",
			addr, USB_DEVICE_MAX_ADDRESS);
		return -EINVAL;
	}

	if (device_state == USB_STATE_CONFIGURED) {
		dev_err(priv_dev->dev,
			"can't set_address from configured state\n");
		return -EINVAL;
	}

	reg = readl(&priv_dev->regs->usb_cmd);

	writel(reg | USB_CMD_FADDR(addr) | USB_CMD_SET_ADDR,
	       &priv_dev->regs->usb_cmd);

	usb_gadget_set_state(&priv_dev->gadget,
			     (addr ? USB_STATE_ADDRESS : USB_STATE_DEFAULT));

	return 0;
}

/**
 * cdns3_req_ep0_get_status - Handling of GET_STATUS standard USB request
 * @priv_dev: extended gadget object
 * @ctrl: pointer to received setup packet
 *
 * Returns 0 if success, error code on error
 */
static int cdns3_req_ep0_get_status(struct cdns3_device *priv_dev,
				    struct usb_ctrlrequest *ctrl)
{
	struct cdns3_endpoint *priv_ep;
	__le16 *response_pkt;
	u16 usb_status = 0;
	u32 recip;
	u8 index;

	recip = ctrl->bRequestType & USB_RECIP_MASK;

	switch (recip) {
	case USB_RECIP_DEVICE:
		/* self powered */
		if (priv_dev->is_selfpowered)
			usb_status = BIT(USB_DEVICE_SELF_POWERED);

		if (priv_dev->wake_up_flag)
			usb_status |= BIT(USB_DEVICE_REMOTE_WAKEUP);

		if (priv_dev->gadget.speed != USB_SPEED_SUPER)
			break;

		if (priv_dev->u1_allowed)
			usb_status |= BIT(USB_DEV_STAT_U1_ENABLED);

		if (priv_dev->u2_allowed)
			usb_status |= BIT(USB_DEV_STAT_U2_ENABLED);

		break;
	case USB_RECIP_INTERFACE:
		return cdns3_ep0_delegate_req(priv_dev, ctrl);
	case USB_RECIP_ENDPOINT:
		index = cdns3_ep_addr_to_index(le16_to_cpu(ctrl->wIndex));
		priv_ep = priv_dev->eps[index];

		/* check if endpoint is stalled or stall is pending */
		cdns3_select_ep(priv_dev, le16_to_cpu(ctrl->wIndex));
		if (EP_STS_STALL(readl(&priv_dev->regs->ep_sts)) ||
		    (priv_ep->flags & EP_STALL_PENDING))
			usb_status =  BIT(USB_ENDPOINT_HALT);
		break;
	default:
		return -EINVAL;
	}

	response_pkt = (__le16 *)priv_dev->setup_buf;
	*response_pkt = cpu_to_le16(usb_status);

	cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
			       sizeof(*response_pkt), 1, 0);
	return 0;
}

static int cdns3_ep0_feature_handle_device(struct cdns3_device *priv_dev,
					   struct usb_ctrlrequest *ctrl,
					   int set)
{
	enum usb_device_state state;
	enum usb_device_speed speed;
	int ret = 0;
	u32 wValue;
	u16 tmode;

	wValue = le16_to_cpu(ctrl->wValue);
	state = priv_dev->gadget.state;
	speed = priv_dev->gadget.speed;

	switch (wValue) {
	case USB_DEVICE_REMOTE_WAKEUP:
		priv_dev->wake_up_flag = !!set;
		break;
	case USB_DEVICE_U1_ENABLE:
		if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
			return -EINVAL;

		priv_dev->u1_allowed = !!set;
		break;
	case USB_DEVICE_U2_ENABLE:
		if (state != USB_STATE_CONFIGURED || speed != USB_SPEED_SUPER)
			return -EINVAL;

		priv_dev->u2_allowed = !!set;
		break;
	case USB_DEVICE_LTM_ENABLE:
		ret = -EINVAL;
		break;
	case USB_DEVICE_TEST_MODE:
		if (state != USB_STATE_CONFIGURED || speed > USB_SPEED_HIGH)
			return -EINVAL;

		tmode = le16_to_cpu(ctrl->wIndex);

		if (!set || (tmode & 0xff) != 0)
			return -EINVAL;

		tmode >>= 8;
		switch (tmode) {
		case USB_TEST_J:
		case USB_TEST_K:
		case USB_TEST_SE0_NAK:
		case USB_TEST_PACKET:
			cdns3_set_register_bit(&priv_dev->regs->usb_cmd,
					       USB_CMD_STMODE |
					       USB_STS_TMODE_SEL(tmode - 1));
			break;
		default:
			ret = -EINVAL;
		}
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int cdns3_ep0_feature_handle_intf(struct cdns3_device *priv_dev,
					 struct usb_ctrlrequest *ctrl,
					 int set)
{
	u32 wValue;
	int ret = 0;

	wValue = le16_to_cpu(ctrl->wValue);

	switch (wValue) {
	case USB_INTRF_FUNC_SUSPEND:
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int cdns3_ep0_feature_handle_endpoint(struct cdns3_device *priv_dev,
					     struct usb_ctrlrequest *ctrl,
					     int set)
{
	struct cdns3_endpoint *priv_ep;
	int ret = 0;
	u8 index;

	if (le16_to_cpu(ctrl->wValue) != USB_ENDPOINT_HALT)
		return -EINVAL;

	if (!(ctrl->wIndex & ~USB_DIR_IN))
		return 0;

	index = cdns3_ep_addr_to_index(le16_to_cpu(ctrl->wIndex));
	priv_ep = priv_dev->eps[index];

	cdns3_select_ep(priv_dev, le16_to_cpu(ctrl->wIndex));

	if (set)
		__cdns3_gadget_ep_set_halt(priv_ep);
	else if (!(priv_ep->flags & EP_WEDGE))
		ret = __cdns3_gadget_ep_clear_halt(priv_ep);

	cdns3_select_ep(priv_dev, 0x00);

	return ret;
}

/**
 * cdns3_req_ep0_handle_feature -
 * Handling of GET/SET_FEATURE standard USB request
 *
 * @priv_dev: extended gadget object
 * @ctrl: pointer to received setup packet
 * @set: must be set to 1 for SET_FEATURE request
 *
 * Returns 0 if success, error code on error
 */
static int cdns3_req_ep0_handle_feature(struct cdns3_device *priv_dev,
					struct usb_ctrlrequest *ctrl,
					int set)
{
	int ret = 0;
	u32 recip;

	recip = ctrl->bRequestType & USB_RECIP_MASK;

	switch (recip) {
	case USB_RECIP_DEVICE:
		ret = cdns3_ep0_feature_handle_device(priv_dev, ctrl, set);
		break;
	case USB_RECIP_INTERFACE:
		ret = cdns3_ep0_feature_handle_intf(priv_dev, ctrl, set);
		break;
	case USB_RECIP_ENDPOINT:
		ret = cdns3_ep0_feature_handle_endpoint(priv_dev, ctrl, set);
		break;
	default:
		return -EINVAL;
	}

	return ret;
}

/**
 * cdns3_req_ep0_set_sel - Handling of SET_SEL standard USB request
 * @priv_dev: extended gadget object
 * @ctrl_req: pointer to received setup packet
 *
 * Returns 0 if success, error code on error
 */
static int cdns3_req_ep0_set_sel(struct cdns3_device *priv_dev,
				 struct usb_ctrlrequest *ctrl_req)
{
	if (priv_dev->gadget.state < USB_STATE_ADDRESS)
		return -EINVAL;

	if (le16_to_cpu(ctrl_req->wLength) != 6) {
		dev_err(priv_dev->dev, "Set SEL should be 6 bytes, got %d\n",
			ctrl_req->wLength);
		return -EINVAL;
	}

	cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma, 6, 1, 0);
	return 0;
}

/**
 * cdns3_req_ep0_set_isoch_delay -
 * Handling of GET_ISOCH_DELAY standard USB request
 * @priv_dev: extended gadget object
 * @ctrl_req: pointer to received setup packet
 *
 * Returns 0 if success, error code on error
 */
static int cdns3_req_ep0_set_isoch_delay(struct cdns3_device *priv_dev,
					 struct usb_ctrlrequest *ctrl_req)
{
	if (ctrl_req->wIndex || ctrl_req->wLength)
		return -EINVAL;

	priv_dev->isoch_delay = le16_to_cpu(ctrl_req->wValue);

	return 0;
}

/**
 * cdns3_ep0_standard_request - Handling standard USB requests
 * @priv_dev: extended gadget object
 * @ctrl_req: pointer to received setup packet
 *
 * Returns 0 if success, error code on error
 */
static int cdns3_ep0_standard_request(struct cdns3_device *priv_dev,
				      struct usb_ctrlrequest *ctrl_req)
{
	int ret;

	switch (ctrl_req->bRequest) {
	case USB_REQ_SET_ADDRESS:
		ret = cdns3_req_ep0_set_address(priv_dev, ctrl_req);
		break;
	case USB_REQ_SET_CONFIGURATION:
		ret = cdns3_req_ep0_set_configuration(priv_dev, ctrl_req);
		break;
	case USB_REQ_GET_STATUS:
		ret = cdns3_req_ep0_get_status(priv_dev, ctrl_req);
		break;
	case USB_REQ_CLEAR_FEATURE:
		ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 0);
		break;
	case USB_REQ_SET_FEATURE:
		ret = cdns3_req_ep0_handle_feature(priv_dev, ctrl_req, 1);
		break;
	case USB_REQ_SET_SEL:
		ret = cdns3_req_ep0_set_sel(priv_dev, ctrl_req);
		break;
	case USB_REQ_SET_ISOCH_DELAY:
		ret = cdns3_req_ep0_set_isoch_delay(priv_dev, ctrl_req);
		break;
	default:
		ret = cdns3_ep0_delegate_req(priv_dev, ctrl_req);
		break;
	}

	return ret;
}

static void __pending_setup_status_handler(struct cdns3_device *priv_dev)
{
	struct usb_request *request = priv_dev->pending_status_request;

	if (priv_dev->status_completion_no_call && request &&
	    request->complete) {
		request->complete(&priv_dev->eps[0]->endpoint, request);
		priv_dev->status_completion_no_call = 0;
	}
}

void cdns3_pending_setup_status_handler(struct work_struct *work)
{
	struct cdns3_device *priv_dev = container_of(work, struct cdns3_device,
			pending_status_wq);
	unsigned long flags;

	spin_lock_irqsave(&priv_dev->lock, flags);
	__pending_setup_status_handler(priv_dev);
	spin_unlock_irqrestore(&priv_dev->lock, flags);
}

/**
 * cdns3_ep0_setup_phase - Handling setup USB requests
 * @priv_dev: extended gadget object
 */
static void cdns3_ep0_setup_phase(struct cdns3_device *priv_dev)
{
	struct usb_ctrlrequest *ctrl = priv_dev->setup_buf;
	struct cdns3_endpoint *priv_ep = priv_dev->eps[0];
	int result;

	priv_dev->ep0_data_dir = ctrl->bRequestType & USB_DIR_IN;

	trace_cdns3_ctrl_req(ctrl);

	if (!list_empty(&priv_ep->pending_req_list)) {
		struct usb_request *request;

		request = cdns3_next_request(&priv_ep->pending_req_list);
		priv_ep->dir = priv_dev->ep0_data_dir;
		cdns3_gadget_giveback(priv_ep, to_cdns3_request(request),
				      -ECONNRESET);
	}

	if (le16_to_cpu(ctrl->wLength))
		priv_dev->ep0_stage = CDNS3_DATA_STAGE;
	else
		priv_dev->ep0_stage = CDNS3_STATUS_STAGE;

	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
		result = cdns3_ep0_standard_request(priv_dev, ctrl);
	else
		result = cdns3_ep0_delegate_req(priv_dev, ctrl);

	if (result == USB_GADGET_DELAYED_STATUS)
		return;

	if (result < 0)
		cdns3_ep0_complete_setup(priv_dev, 1, 1);
	else if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE)
		cdns3_ep0_complete_setup(priv_dev, 0, 1);
}

static void cdns3_transfer_completed(struct cdns3_device *priv_dev)
{
	struct cdns3_endpoint *priv_ep = priv_dev->eps[0];

	if (!list_empty(&priv_ep->pending_req_list)) {
		struct usb_request *request;

		trace_cdns3_complete_trb(priv_ep, priv_ep->trb_pool);
		request = cdns3_next_request(&priv_ep->pending_req_list);

		request->actual =
			TRB_LEN(le32_to_cpu(priv_ep->trb_pool->length));

		priv_ep->dir = priv_dev->ep0_data_dir;
		cdns3_gadget_giveback(priv_ep, to_cdns3_request(request), 0);
	}

	cdns3_ep0_complete_setup(priv_dev, 0, 0);
}

/**
 * cdns3_check_new_setup - Check if controller receive new SETUP packet.
 * @priv_dev: extended gadget object
 *
 * The SETUP packet can be kept in on-chip memory or in system memory.
 */
static bool cdns3_check_new_setup(struct cdns3_device *priv_dev)
{
	u32 ep_sts_reg;

	cdns3_select_ep(priv_dev, USB_DIR_OUT);
	ep_sts_reg = readl(&priv_dev->regs->ep_sts);

	return !!(ep_sts_reg & (EP_STS_SETUP | EP_STS_STPWAIT));
}

/**
 * cdns3_check_ep0_interrupt_proceed - Processes interrupt related to endpoint 0
 * @priv_dev: extended gadget object
 * @dir: USB_DIR_IN for IN direction, USB_DIR_OUT for OUT direction
 */
void cdns3_check_ep0_interrupt_proceed(struct cdns3_device *priv_dev, int dir)
{
	u32 ep_sts_reg;

	cdns3_select_ep(priv_dev, dir);

	ep_sts_reg = readl(&priv_dev->regs->ep_sts);
	writel(ep_sts_reg, &priv_dev->regs->ep_sts);

	trace_cdns3_ep0_irq(priv_dev, ep_sts_reg);

	__pending_setup_status_handler(priv_dev);

	if (ep_sts_reg & EP_STS_SETUP)
		priv_dev->wait_for_setup = 1;

	if (priv_dev->wait_for_setup && ep_sts_reg & EP_STS_IOC) {
		priv_dev->wait_for_setup = 0;
		cdns3_ep0_setup_phase(priv_dev);
	} else if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP)) {
		priv_dev->ep0_data_dir = dir;
		cdns3_transfer_completed(priv_dev);
	}

	if (ep_sts_reg & EP_STS_DESCMIS) {
		if (dir == 0 && !priv_dev->setup_pending)
			cdns3_prepare_setup_packet(priv_dev);
	}
}

/**
 * cdns3_gadget_ep0_enable
 * @ep: pointer to endpoint zero object
 * @desc: pointer to usb endpoint descriptor
 *
 * Function shouldn't be called by gadget driver,
 * endpoint 0 is allways active
 */
static int cdns3_gadget_ep0_enable(struct usb_ep *ep,
				   const struct usb_endpoint_descriptor *desc)
{
	return -EINVAL;
}

/**
 * cdns3_gadget_ep0_disable
 * @ep: pointer to endpoint zero object
 *
 * Function shouldn't be called by gadget driver,
 * endpoint 0 is allways active
 */
static int cdns3_gadget_ep0_disable(struct usb_ep *ep)
{
	return -EINVAL;
}

/**
 * cdns3_gadget_ep0_set_halt
 * @ep: pointer to endpoint zero object
 * @value: 1 for set stall, 0 for clear stall
 *
 * Returns 0
 */
static int cdns3_gadget_ep0_set_halt(struct usb_ep *ep, int value)
{
	/* TODO */
	return 0;
}

/**
 * cdns3_gadget_ep0_queue Transfer data on endpoint zero
 * @ep: pointer to endpoint zero object
 * @request: pointer to request object
 * @gfp_flags: gfp flags
 *
 * Returns 0 on success, error code elsewhere
 */
static int cdns3_gadget_ep0_queue(struct usb_ep *ep,
				  struct usb_request *request,
				  gfp_t gfp_flags)
{
	struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
	unsigned long flags;
	int ret = 0;
	u8 zlp = 0;

	spin_lock_irqsave(&priv_dev->lock, flags);
	trace_cdns3_ep0_queue(priv_dev, request);

	/* cancel the request if controller receive new SETUP packet. */
	if (cdns3_check_new_setup(priv_dev)) {
		spin_unlock_irqrestore(&priv_dev->lock, flags);
		return -ECONNRESET;
	}

	/* send STATUS stage. Should be called only for SET_CONFIGURATION */
	if (priv_dev->ep0_stage == CDNS3_STATUS_STAGE) {
		u32 val;

		cdns3_select_ep(priv_dev, 0x00);
		cdns3_set_hw_configuration(priv_dev);
		cdns3_ep0_complete_setup(priv_dev, 0, 1);
		/* wait until configuration set */
		ret = readl_poll_timeout_atomic(&priv_dev->regs->usb_sts, val,
					  val & USB_STS_CFGSTS_MASK, 1, 100);
		if (ret == -ETIMEDOUT)
			dev_warn(priv_dev->dev, "timeout for waiting configuration set\n");

		request->actual = 0;
		priv_dev->status_completion_no_call = true;
		priv_dev->pending_status_request = request;
		spin_unlock_irqrestore(&priv_dev->lock, flags);

		/*
		 * Since there is no completion interrupt for status stage,
		 * it needs to call ->completion in software after
		 * ep0_queue is back.
		 */
		queue_work(system_freezable_wq, &priv_dev->pending_status_wq);
		return ret;
	}

	if (!list_empty(&priv_ep->pending_req_list)) {
		dev_err(priv_dev->dev,
			"can't handle multiple requests for ep0\n");
		spin_unlock_irqrestore(&priv_dev->lock, flags);
		return -EBUSY;
	}

	ret = usb_gadget_map_request_by_dev(priv_dev->sysdev, request,
					    priv_dev->ep0_data_dir);
	if (ret) {
		spin_unlock_irqrestore(&priv_dev->lock, flags);
		dev_err(priv_dev->dev, "failed to map request\n");
		return -EINVAL;
	}

	request->status = -EINPROGRESS;
	list_add_tail(&request->list, &priv_ep->pending_req_list);

	if (request->zero && request->length &&
	    (request->length % ep->maxpacket == 0))
		zlp = 1;

	cdns3_ep0_run_transfer(priv_dev, request->dma, request->length, 1, zlp);

	spin_unlock_irqrestore(&priv_dev->lock, flags);

	return ret;
}

/**
 * cdns3_gadget_ep_set_wedge Set wedge on selected endpoint
 * @ep: endpoint object
 *
 * Returns 0
 */
int cdns3_gadget_ep_set_wedge(struct usb_ep *ep)
{
	struct cdns3_endpoint *priv_ep = ep_to_cdns3_ep(ep);
	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;

	dev_dbg(priv_dev->dev, "Wedge for %s\n", ep->name);
	cdns3_gadget_ep_set_halt(ep, 1);
	priv_ep->flags |= EP_WEDGE;

	return 0;
}

const struct usb_ep_ops cdns3_gadget_ep0_ops = {
	.enable = cdns3_gadget_ep0_enable,
	.disable = cdns3_gadget_ep0_disable,
	.alloc_request = cdns3_gadget_ep_alloc_request,
	.free_request = cdns3_gadget_ep_free_request,
	.queue = cdns3_gadget_ep0_queue,
	.dequeue = cdns3_gadget_ep_dequeue,
	.set_halt = cdns3_gadget_ep0_set_halt,
	.set_wedge = cdns3_gadget_ep_set_wedge,
};

/**
 * cdns3_ep0_config - Configures default endpoint
 * @priv_dev: extended gadget object
 *
 * Functions sets parameters: maximal packet size and enables interrupts
 */
void cdns3_ep0_config(struct cdns3_device *priv_dev)
{
	struct cdns3_usb_regs __iomem *regs;
	struct cdns3_endpoint *priv_ep;
	u32 max_packet_size = 64;

	regs = priv_dev->regs;

	if (priv_dev->gadget.speed == USB_SPEED_SUPER)
		max_packet_size = 512;

	priv_ep = priv_dev->eps[0];

	if (!list_empty(&priv_ep->pending_req_list)) {
		struct usb_request *request;

		request = cdns3_next_request(&priv_ep->pending_req_list);
		list_del_init(&request->list);
	}

	priv_dev->u1_allowed = 0;
	priv_dev->u2_allowed = 0;

	priv_dev->gadget.ep0->maxpacket = max_packet_size;
	cdns3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(max_packet_size);

	/* init ep out */
	cdns3_select_ep(priv_dev, USB_DIR_OUT);

	if (priv_dev->dev_ver >= DEV_VER_V3) {
		cdns3_set_register_bit(&priv_dev->regs->dtrans,
				       BIT(0) | BIT(16));
		cdns3_set_register_bit(&priv_dev->regs->tdl_from_trb,
				       BIT(0) | BIT(16));
	}

	writel(EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size),
	       &regs->ep_cfg);

	writel(EP_STS_EN_SETUPEN | EP_STS_EN_DESCMISEN | EP_STS_EN_TRBERREN,
	       &regs->ep_sts_en);

	/* init ep in */
	cdns3_select_ep(priv_dev, USB_DIR_IN);

	writel(EP_CFG_ENABLE | EP_CFG_MAXPKTSIZE(max_packet_size),
	       &regs->ep_cfg);

	writel(EP_STS_EN_SETUPEN | EP_STS_EN_TRBERREN, &regs->ep_sts_en);

	cdns3_set_register_bit(&regs->usb_conf, USB_CONF_U1DS | USB_CONF_U2DS);
}

/**
 * cdns3_init_ep0 Initializes software endpoint 0 of gadget
 * @priv_dev: extended gadget object
 * @priv_ep: extended endpoint object
 *
 * Returns 0 on success else error code.
 */
int cdns3_init_ep0(struct cdns3_device *priv_dev,
		   struct cdns3_endpoint *priv_ep)
{
	sprintf(priv_ep->name, "ep0");

	/* fill linux fields */
	priv_ep->endpoint.ops = &cdns3_gadget_ep0_ops;
	priv_ep->endpoint.maxburst = 1;
	usb_ep_set_maxpacket_limit(&priv_ep->endpoint,
				   CDNS3_EP0_MAX_PACKET_LIMIT);
	priv_ep->endpoint.address = 0;
	priv_ep->endpoint.caps.type_control = 1;
	priv_ep->endpoint.caps.dir_in = 1;
	priv_ep->endpoint.caps.dir_out = 1;
	priv_ep->endpoint.name = priv_ep->name;
	priv_ep->endpoint.desc = &cdns3_gadget_ep0_desc;
	priv_dev->gadget.ep0 = &priv_ep->endpoint;
	priv_ep->type = USB_ENDPOINT_XFER_CONTROL;

	return cdns3_allocate_trb_pool(priv_ep);
}