summaryrefslogtreecommitdiffstats
path: root/drivers/usb/renesas_usbhs/mod_gadget.c
blob: 805940c373532bd4d548b5cf4d868ce4d75024ad (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
/*
 * Renesas USB driver
 *
 * Copyright (C) 2011 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include "common.h"

/*
 *		struct
 */
struct usbhsg_request {
	struct usb_request	req;
	struct usbhs_pkt	pkt;
};

#define EP_NAME_SIZE 8
struct usbhsg_gpriv;
struct usbhsg_uep {
	struct usb_ep		 ep;
	struct usbhs_pipe	*pipe;

	char ep_name[EP_NAME_SIZE];

	struct usbhsg_gpriv *gpriv;
};

struct usbhsg_gpriv {
	struct usb_gadget	 gadget;
	struct usbhs_mod	 mod;

	struct usbhsg_uep	*uep;
	int			 uep_size;

	struct usb_gadget_driver	*driver;

	u32	status;
#define USBHSG_STATUS_STARTED		(1 << 0)
#define USBHSG_STATUS_REGISTERD		(1 << 1)
#define USBHSG_STATUS_WEDGE		(1 << 2)
#define USBHSG_STATUS_SELF_POWERED	(1 << 3)
};

struct usbhsg_recip_handle {
	char *name;
	int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
		      struct usb_ctrlrequest *ctrl);
	int (*interface)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
			 struct usb_ctrlrequest *ctrl);
	int (*endpoint)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
			struct usb_ctrlrequest *ctrl);
};

/*
 *		macro
 */
#define usbhsg_priv_to_gpriv(priv)			\
	container_of(					\
		usbhs_mod_get(priv, USBHS_GADGET),	\
		struct usbhsg_gpriv, mod)

#define __usbhsg_for_each_uep(start, pos, g, i)	\
	for (i = start, pos = (g)->uep + i;	\
	     i < (g)->uep_size;			\
	     i++, pos = (g)->uep + i)

#define usbhsg_for_each_uep(pos, gpriv, i)	\
	__usbhsg_for_each_uep(1, pos, gpriv, i)

#define usbhsg_for_each_uep_with_dcp(pos, gpriv, i)	\
	__usbhsg_for_each_uep(0, pos, gpriv, i)

#define usbhsg_gadget_to_gpriv(g)\
	container_of(g, struct usbhsg_gpriv, gadget)

#define usbhsg_req_to_ureq(r)\
	container_of(r, struct usbhsg_request, req)

#define usbhsg_ep_to_uep(e)		container_of(e, struct usbhsg_uep, ep)
#define usbhsg_gpriv_to_dev(gp)		usbhs_priv_to_dev((gp)->mod.priv)
#define usbhsg_gpriv_to_priv(gp)	((gp)->mod.priv)
#define usbhsg_gpriv_to_dcp(gp)		((gp)->uep)
#define usbhsg_gpriv_to_nth_uep(gp, i)	((gp)->uep + i)
#define usbhsg_uep_to_gpriv(u)		((u)->gpriv)
#define usbhsg_uep_to_pipe(u)		((u)->pipe)
#define usbhsg_pipe_to_uep(p)		((p)->mod_private)
#define usbhsg_is_dcp(u)		((u) == usbhsg_gpriv_to_dcp((u)->gpriv))

#define usbhsg_ureq_to_pkt(u)		(&(u)->pkt)
#define usbhsg_pkt_to_ureq(i)	\
	container_of(i, struct usbhsg_request, pkt)

#define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN)

/* status */
#define usbhsg_status_init(gp)   do {(gp)->status = 0; } while (0)
#define usbhsg_status_set(gp, b) (gp->status |=  b)
#define usbhsg_status_clr(gp, b) (gp->status &= ~b)
#define usbhsg_status_has(gp, b) (gp->status &   b)

/*
 *		queue push/pop
 */
static void usbhsg_queue_pop(struct usbhsg_uep *uep,
			     struct usbhsg_request *ureq,
			     int status)
{
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
	struct device *dev = usbhsg_gpriv_to_dev(gpriv);

	dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));

	ureq->req.status = status;
	ureq->req.complete(&uep->ep, &ureq->req);
}

static void usbhsg_queue_done(struct usbhs_priv *priv, struct usbhs_pkt *pkt)
{
	struct usbhs_pipe *pipe = pkt->pipe;
	struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);

	ureq->req.actual = pkt->actual;

	usbhsg_queue_pop(uep, ureq, 0);
}

static void usbhsg_queue_push(struct usbhsg_uep *uep,
			      struct usbhsg_request *ureq)
{
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
	struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
	struct usb_request *req = &ureq->req;

	req->actual = 0;
	req->status = -EINPROGRESS;
	usbhs_pkt_push(pipe, pkt, usbhsg_queue_done,
		       req->buf, req->length, req->zero, -1);
	usbhs_pkt_start(pipe);

	dev_dbg(dev, "pipe %d : queue push (%d)\n",
		usbhs_pipe_number(pipe),
		req->length);
}

/*
 *		dma map/unmap
 */
static int usbhsg_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
{
	struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
	struct usb_request *req = &ureq->req;
	struct usbhs_pipe *pipe = pkt->pipe;
	struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	enum dma_data_direction dir;
	int ret = 0;

	dir = usbhs_pipe_is_dir_host(pipe);

	if (map) {
		/* it can not use scatter/gather */
		WARN_ON(req->num_sgs);

		ret = usb_gadget_map_request(&gpriv->gadget, req, dir);
		if (ret < 0)
			return ret;

		pkt->dma = req->dma;
	} else {
		usb_gadget_unmap_request(&gpriv->gadget, req, dir);
	}

	return ret;
}

/*
 *		USB_TYPE_STANDARD / clear feature functions
 */
static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
						 struct usbhsg_uep *uep,
						 struct usb_ctrlrequest *ctrl)
{
	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);

	usbhs_dcp_control_transfer_done(pipe);

	return 0;
}

static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
						   struct usbhsg_uep *uep,
						   struct usb_ctrlrequest *ctrl)
{
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);

	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
		usbhs_pipe_disable(pipe);
		usbhs_pipe_sequence_data0(pipe);
		usbhs_pipe_enable(pipe);
	}

	usbhsg_recip_handler_std_control_done(priv, uep, ctrl);

	usbhs_pkt_start(pipe);

	return 0;
}

static struct usbhsg_recip_handle req_clear_feature = {
	.name		= "clear feature",
	.device		= usbhsg_recip_handler_std_control_done,
	.interface	= usbhsg_recip_handler_std_control_done,
	.endpoint	= usbhsg_recip_handler_std_clear_endpoint,
};

/*
 *		USB_TYPE_STANDARD / set feature functions
 */
static int usbhsg_recip_handler_std_set_device(struct usbhs_priv *priv,
						 struct usbhsg_uep *uep,
						 struct usb_ctrlrequest *ctrl)
{
	switch (le16_to_cpu(ctrl->wValue)) {
	case USB_DEVICE_TEST_MODE:
		usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
		udelay(100);
		usbhs_sys_set_test_mode(priv, le16_to_cpu(ctrl->wIndex >> 8));
		break;
	default:
		usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
		break;
	}

	return 0;
}

static int usbhsg_recip_handler_std_set_endpoint(struct usbhs_priv *priv,
						 struct usbhsg_uep *uep,
						 struct usb_ctrlrequest *ctrl)
{
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);

	usbhs_pipe_stall(pipe);

	usbhsg_recip_handler_std_control_done(priv, uep, ctrl);

	return 0;
}

static struct usbhsg_recip_handle req_set_feature = {
	.name		= "set feature",
	.device		= usbhsg_recip_handler_std_set_device,
	.interface	= usbhsg_recip_handler_std_control_done,
	.endpoint	= usbhsg_recip_handler_std_set_endpoint,
};

/*
 *		USB_TYPE_STANDARD / get status functions
 */
static void __usbhsg_recip_send_complete(struct usb_ep *ep,
					 struct usb_request *req)
{
	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);

	/* free allocated recip-buffer/usb_request */
	kfree(ureq->pkt.buf);
	usb_ep_free_request(ep, req);
}

static void __usbhsg_recip_send_status(struct usbhsg_gpriv *gpriv,
				       unsigned short status)
{
	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
	struct usb_request *req;
	unsigned short *buf;

	/* alloc new usb_request for recip */
	req = usb_ep_alloc_request(&dcp->ep, GFP_ATOMIC);
	if (!req) {
		dev_err(dev, "recip request allocation fail\n");
		return;
	}

	/* alloc recip data buffer */
	buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
	if (!buf) {
		usb_ep_free_request(&dcp->ep, req);
		dev_err(dev, "recip data allocation fail\n");
		return;
	}

	/* recip data is status */
	*buf = cpu_to_le16(status);

	/* allocated usb_request/buffer will be freed */
	req->complete	= __usbhsg_recip_send_complete;
	req->buf	= buf;
	req->length	= sizeof(*buf);
	req->zero	= 0;

	/* push packet */
	pipe->handler = &usbhs_fifo_pio_push_handler;
	usbhsg_queue_push(dcp, usbhsg_req_to_ureq(req));
}

static int usbhsg_recip_handler_std_get_device(struct usbhs_priv *priv,
					       struct usbhsg_uep *uep,
					       struct usb_ctrlrequest *ctrl)
{
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	unsigned short status = 0;

	if (usbhsg_status_has(gpriv, USBHSG_STATUS_SELF_POWERED))
		status = 1 << USB_DEVICE_SELF_POWERED;

	__usbhsg_recip_send_status(gpriv, status);

	return 0;
}

static int usbhsg_recip_handler_std_get_interface(struct usbhs_priv *priv,
						  struct usbhsg_uep *uep,
						  struct usb_ctrlrequest *ctrl)
{
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	unsigned short status = 0;

	__usbhsg_recip_send_status(gpriv, status);

	return 0;
}

static int usbhsg_recip_handler_std_get_endpoint(struct usbhs_priv *priv,
						 struct usbhsg_uep *uep,
						 struct usb_ctrlrequest *ctrl)
{
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
	unsigned short status = 0;

	if (usbhs_pipe_is_stall(pipe))
		status = 1 << USB_ENDPOINT_HALT;

	__usbhsg_recip_send_status(gpriv, status);

	return 0;
}

static struct usbhsg_recip_handle req_get_status = {
	.name		= "get status",
	.device		= usbhsg_recip_handler_std_get_device,
	.interface	= usbhsg_recip_handler_std_get_interface,
	.endpoint	= usbhsg_recip_handler_std_get_endpoint,
};

/*
 *		USB_TYPE handler
 */
static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
				   struct usbhsg_recip_handle *handler,
				   struct usb_ctrlrequest *ctrl)
{
	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
	struct usbhsg_uep *uep;
	struct usbhs_pipe *pipe;
	int recip = ctrl->bRequestType & USB_RECIP_MASK;
	int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
	int ret = 0;
	int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
		    struct usb_ctrlrequest *ctrl);
	char *msg;

	uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
	pipe = usbhsg_uep_to_pipe(uep);
	if (!pipe) {
		dev_err(dev, "wrong recip request\n");
		return -EINVAL;
	}

	switch (recip) {
	case USB_RECIP_DEVICE:
		msg	= "DEVICE";
		func	= handler->device;
		break;
	case USB_RECIP_INTERFACE:
		msg	= "INTERFACE";
		func	= handler->interface;
		break;
	case USB_RECIP_ENDPOINT:
		msg	= "ENDPOINT";
		func	= handler->endpoint;
		break;
	default:
		dev_warn(dev, "unsupported RECIP(%d)\n", recip);
		func = NULL;
		ret = -EINVAL;
	}

	if (func) {
		dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
		ret = func(priv, uep, ctrl);
	}

	return ret;
}

/*
 *		irq functions
 *
 * it will be called from usbhs_interrupt
 */
static int usbhsg_irq_dev_state(struct usbhs_priv *priv,
				struct usbhs_irq_state *irq_state)
{
	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
	struct device *dev = usbhsg_gpriv_to_dev(gpriv);

	gpriv->gadget.speed = usbhs_bus_get_speed(priv);

	dev_dbg(dev, "state = %x : speed : %d\n",
		usbhs_status_get_device_state(irq_state),
		gpriv->gadget.speed);

	return 0;
}

static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
				 struct usbhs_irq_state *irq_state)
{
	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
	struct usb_ctrlrequest ctrl;
	struct usbhsg_recip_handle *recip_handler = NULL;
	int stage = usbhs_status_get_ctrl_stage(irq_state);
	int ret = 0;

	dev_dbg(dev, "stage = %d\n", stage);

	/*
	 * see Manual
	 *
	 *  "Operation"
	 *  - "Interrupt Function"
	 *    - "Control Transfer Stage Transition Interrupt"
	 *      - Fig. "Control Transfer Stage Transitions"
	 */

	switch (stage) {
	case READ_DATA_STAGE:
		pipe->handler = &usbhs_fifo_pio_push_handler;
		break;
	case WRITE_DATA_STAGE:
		pipe->handler = &usbhs_fifo_pio_pop_handler;
		break;
	case NODATA_STATUS_STAGE:
		pipe->handler = &usbhs_ctrl_stage_end_handler;
		break;
	default:
		return ret;
	}

	/*
	 * get usb request
	 */
	usbhs_usbreq_get_val(priv, &ctrl);

	switch (ctrl.bRequestType & USB_TYPE_MASK) {
	case USB_TYPE_STANDARD:
		switch (ctrl.bRequest) {
		case USB_REQ_CLEAR_FEATURE:
			recip_handler = &req_clear_feature;
			break;
		case USB_REQ_SET_FEATURE:
			recip_handler = &req_set_feature;
			break;
		case USB_REQ_GET_STATUS:
			recip_handler = &req_get_status;
			break;
		}
	}

	/*
	 * setup stage / run recip
	 */
	if (recip_handler)
		ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
	else
		ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);

	if (ret < 0)
		usbhs_pipe_stall(pipe);

	return ret;
}

/*
 *
 *		usb_dcp_ops
 *
 */
static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
{
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
	struct usbhs_pkt *pkt;

	while (1) {
		pkt = usbhs_pkt_pop(pipe, NULL);
		if (!pkt)
			break;

		usbhsg_queue_pop(uep, usbhsg_pkt_to_ureq(pkt), -ECONNRESET);
	}

	usbhs_pipe_disable(pipe);

	return 0;
}

/*
 *
 *		usb_ep_ops
 *
 */
static int usbhsg_ep_enable(struct usb_ep *ep,
			 const struct usb_endpoint_descriptor *desc)
{
	struct usbhsg_uep *uep   = usbhsg_ep_to_uep(ep);
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
	struct usbhs_pipe *pipe;
	int ret = -EIO;

	/*
	 * if it already have pipe,
	 * nothing to do
	 */
	if (uep->pipe) {
		usbhs_pipe_clear(uep->pipe);
		usbhs_pipe_sequence_data0(uep->pipe);
		return 0;
	}

	pipe = usbhs_pipe_malloc(priv,
				 usb_endpoint_type(desc),
				 usb_endpoint_dir_in(desc));
	if (pipe) {
		uep->pipe		= pipe;
		pipe->mod_private	= uep;

		/* set epnum / maxp */
		usbhs_pipe_config_update(pipe, 0,
					 usb_endpoint_num(desc),
					 usb_endpoint_maxp(desc));

		/*
		 * usbhs_fifo_dma_push/pop_handler try to
		 * use dmaengine if possible.
		 * It will use pio handler if impossible.
		 */
		if (usb_endpoint_dir_in(desc))
			pipe->handler = &usbhs_fifo_dma_push_handler;
		else
			pipe->handler = &usbhs_fifo_dma_pop_handler;

		ret = 0;
	}

	return ret;
}

static int usbhsg_ep_disable(struct usb_ep *ep)
{
	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);

	usbhsg_pipe_disable(uep);

	uep->pipe->mod_private	= NULL;
	uep->pipe		= NULL;

	return 0;
}

static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
						   gfp_t gfp_flags)
{
	struct usbhsg_request *ureq;

	ureq = kzalloc(sizeof *ureq, gfp_flags);
	if (!ureq)
		return NULL;

	usbhs_pkt_init(usbhsg_ureq_to_pkt(ureq));

	return &ureq->req;
}

static void usbhsg_ep_free_request(struct usb_ep *ep,
				   struct usb_request *req)
{
	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);

	WARN_ON(!list_empty(&ureq->pkt.node));
	kfree(ureq);
}

static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
			  gfp_t gfp_flags)
{
	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);

	/* param check */
	if (usbhsg_is_not_connected(gpriv)	||
	    unlikely(!gpriv->driver)		||
	    unlikely(!pipe))
		return -ESHUTDOWN;

	usbhsg_queue_push(uep, ureq);

	return 0;
}

static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
{
	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);

	usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
	usbhsg_queue_pop(uep, ureq, -ECONNRESET);

	return 0;
}

static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
{
	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
	unsigned long flags;

	usbhsg_pipe_disable(uep);

	dev_dbg(dev, "set halt %d (pipe %d)\n",
		halt, usbhs_pipe_number(pipe));

	/********************  spin lock ********************/
	usbhs_lock(priv, flags);

	if (halt)
		usbhs_pipe_stall(pipe);
	else
		usbhs_pipe_disable(pipe);

	if (halt && wedge)
		usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
	else
		usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);

	usbhs_unlock(priv, flags);
	/********************  spin unlock ******************/

	return 0;
}

static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
{
	return __usbhsg_ep_set_halt_wedge(ep, value, 0);
}

static int usbhsg_ep_set_wedge(struct usb_ep *ep)
{
	return __usbhsg_ep_set_halt_wedge(ep, 1, 1);
}

static struct usb_ep_ops usbhsg_ep_ops = {
	.enable		= usbhsg_ep_enable,
	.disable	= usbhsg_ep_disable,

	.alloc_request	= usbhsg_ep_alloc_request,
	.free_request	= usbhsg_ep_free_request,

	.queue		= usbhsg_ep_queue,
	.dequeue	= usbhsg_ep_dequeue,

	.set_halt	= usbhsg_ep_set_halt,
	.set_wedge	= usbhsg_ep_set_wedge,
};

/*
 *		usb module start/end
 */
static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
{
	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
	struct device *dev = usbhs_priv_to_dev(priv);
	unsigned long flags;
	int ret = 0;

	/********************  spin lock ********************/
	usbhs_lock(priv, flags);

	usbhsg_status_set(gpriv, status);
	if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
	      usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
		ret = -1; /* not ready */

	usbhs_unlock(priv, flags);
	/********************  spin unlock ********************/

	if (ret < 0)
		return 0; /* not ready is not error */

	/*
	 * enable interrupt and systems if ready
	 */
	dev_dbg(dev, "start gadget\n");

	/*
	 * pipe initialize and enable DCP
	 */
	usbhs_pipe_init(priv,
			usbhsg_dma_map_ctrl);
	usbhs_fifo_init(priv);

	/* dcp init instead of usbhsg_ep_enable() */
	dcp->pipe		= usbhs_dcp_malloc(priv);
	dcp->pipe->mod_private	= dcp;
	usbhs_pipe_config_update(dcp->pipe, 0, 0, 64);

	/*
	 * system config enble
	 * - HI speed
	 * - function
	 * - usb module
	 */
	usbhs_sys_function_ctrl(priv, 1);

	/*
	 * enable irq callback
	 */
	mod->irq_dev_state	= usbhsg_irq_dev_state;
	mod->irq_ctrl_stage	= usbhsg_irq_ctrl_stage;
	usbhs_irq_callback_update(priv, mod);

	return 0;
}

static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
{
	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
	struct device *dev = usbhs_priv_to_dev(priv);
	unsigned long flags;
	int ret = 0;

	/********************  spin lock ********************/
	usbhs_lock(priv, flags);

	usbhsg_status_clr(gpriv, status);
	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
	    !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
		ret = -1; /* already done */

	usbhs_unlock(priv, flags);
	/********************  spin unlock ********************/

	if (ret < 0)
		return 0; /* already done is not error */

	/*
	 * disable interrupt and systems if 1st try
	 */
	usbhs_fifo_quit(priv);

	/* disable all irq */
	mod->irq_dev_state	= NULL;
	mod->irq_ctrl_stage	= NULL;
	usbhs_irq_callback_update(priv, mod);

	gpriv->gadget.speed = USB_SPEED_UNKNOWN;

	/* disable sys */
	usbhs_sys_set_test_mode(priv, 0);
	usbhs_sys_function_ctrl(priv, 0);

	usbhsg_ep_disable(&dcp->ep);

	dev_dbg(dev, "stop gadget\n");

	return 0;
}

/*
 *
 *		linux usb function
 *
 */
static int usbhsg_gadget_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);

	if (!driver		||
	    !driver->setup	||
	    driver->max_speed < USB_SPEED_FULL)
		return -EINVAL;

	/* first hook up the driver ... */
	gpriv->driver = driver;

	return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
}

static int usbhsg_gadget_stop(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);

	usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
	gpriv->driver = NULL;

	return 0;
}

/*
 *		usb gadget ops
 */
static int usbhsg_get_frame(struct usb_gadget *gadget)
{
	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);

	return usbhs_frame_get_num(priv);
}

static int usbhsg_pullup(struct usb_gadget *gadget, int is_on)
{
	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);

	usbhs_sys_function_pullup(priv, is_on);

	return 0;
}

static int usbhsg_set_selfpowered(struct usb_gadget *gadget, int is_self)
{
	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);

	if (is_self)
		usbhsg_status_set(gpriv, USBHSG_STATUS_SELF_POWERED);
	else
		usbhsg_status_clr(gpriv, USBHSG_STATUS_SELF_POWERED);

	return 0;
}

static const struct usb_gadget_ops usbhsg_gadget_ops = {
	.get_frame		= usbhsg_get_frame,
	.set_selfpowered	= usbhsg_set_selfpowered,
	.udc_start		= usbhsg_gadget_start,
	.udc_stop		= usbhsg_gadget_stop,
	.pullup			= usbhsg_pullup,
};

static int usbhsg_start(struct usbhs_priv *priv)
{
	return usbhsg_try_start(priv, USBHSG_STATUS_STARTED);
}

static int usbhsg_stop(struct usbhs_priv *priv)
{
	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);

	/* cable disconnect */
	if (gpriv->driver &&
	    gpriv->driver->disconnect)
		gpriv->driver->disconnect(&gpriv->gadget);

	return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED);
}

int usbhs_mod_gadget_probe(struct usbhs_priv *priv)
{
	struct usbhsg_gpriv *gpriv;
	struct usbhsg_uep *uep;
	struct device *dev = usbhs_priv_to_dev(priv);
	int pipe_size = usbhs_get_dparam(priv, pipe_size);
	int i;
	int ret;

	gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
	if (!gpriv) {
		dev_err(dev, "Could not allocate gadget priv\n");
		return -ENOMEM;
	}

	uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
	if (!uep) {
		dev_err(dev, "Could not allocate ep\n");
		ret = -ENOMEM;
		goto usbhs_mod_gadget_probe_err_gpriv;
	}

	/*
	 * CAUTION
	 *
	 * There is no guarantee that it is possible to access usb module here.
	 * Don't accesses to it.
	 * The accesse will be enable after "usbhsg_start"
	 */

	/*
	 * register itself
	 */
	usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET);

	/* init gpriv */
	gpriv->mod.name		= "gadget";
	gpriv->mod.start	= usbhsg_start;
	gpriv->mod.stop		= usbhsg_stop;
	gpriv->uep		= uep;
	gpriv->uep_size		= pipe_size;
	usbhsg_status_init(gpriv);

	/*
	 * init gadget
	 */
	gpriv->gadget.dev.parent	= dev;
	gpriv->gadget.name		= "renesas_usbhs_udc";
	gpriv->gadget.ops		= &usbhsg_gadget_ops;
	gpriv->gadget.max_speed		= USB_SPEED_HIGH;

	INIT_LIST_HEAD(&gpriv->gadget.ep_list);

	/*
	 * init usb_ep
	 */
	usbhsg_for_each_uep_with_dcp(uep, gpriv, i) {
		uep->gpriv	= gpriv;
		uep->pipe	= NULL;
		snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i);

		uep->ep.name		= uep->ep_name;
		uep->ep.ops		= &usbhsg_ep_ops;
		INIT_LIST_HEAD(&uep->ep.ep_list);

		/* init DCP */
		if (usbhsg_is_dcp(uep)) {
			gpriv->gadget.ep0 = &uep->ep;
			uep->ep.maxpacket = 64;
		}
		/* init normal pipe */
		else {
			uep->ep.maxpacket = 512;
			list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
		}
	}

	ret = usb_add_gadget_udc(dev, &gpriv->gadget);
	if (ret)
		goto err_add_udc;


	dev_info(dev, "gadget probed\n");

	return 0;

err_add_udc:
	kfree(gpriv->uep);

usbhs_mod_gadget_probe_err_gpriv:
	kfree(gpriv);

	return ret;
}

void usbhs_mod_gadget_remove(struct usbhs_priv *priv)
{
	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);

	usb_del_gadget_udc(&gpriv->gadget);

	kfree(gpriv->uep);
	kfree(gpriv);
}