aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/renesas_usbhs/mod_host.c
blob: 7955de5899512ecff50c099ab084a35a36a10f07 (plain) (blame)
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
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
/*
 * 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/io.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "common.h"

/*
 *** HARDWARE LIMITATION ***
 *
 * 1) renesas_usbhs has a limited number of controllable devices.
 *    it can control only 9 devices in generally.
 *	see DEVADDn / DCPMAXP / PIPEMAXP.
 *
 * 2) renesas_usbhs pipe number is limited.
 *    the pipe will be re-used for each devices.
 *    so, software should control DATA0/1 sequence of each devices.
 */


/*
 *		image of mod_host
 *
 * +--------+
 * | udev 0 | --> it is used when set address
 * +--------+
 *
 * +--------+					pipes are reused for each uep.
 * | udev 1 |-+- [uep 0 (dcp) ] --+		pipe will be switched when
 * +--------+ |			  |		target device was changed
 *	      +- [uep 1 (bulk)]	--|---+		   +--------------+
 *	      |			  +--------------> | pipe0 (dcp)  |
 *	      +- [uep 2 (bulk)]	--|---|---+	   +--------------+
 *				  |   |	  |	   | pipe1 (isoc) |
 * +--------+			  |   |	  |	   +--------------+
 * | udev 2 |-+- [uep 0 (dcp) ]	--+   +-- |------> | pipe2 (bulk) |
 * +--------+ |			  |   |	  |	   +--------------+
 *	      +- [uep 1 (int) ]	--|-+ |	  +------> | pipe3 (bulk) |
 *				  | | |	  |	   +--------------+
 * +--------+			  | +-|---|------> | pipe4 (int)  |
 * | udev 3 |-+- [uep 0 (dcp) ]	--+   |	  |	   +--------------+
 * +--------+ |			      |	  |	   | ....	  |
 *	      +- [uep 1 (bulk)]	------+	  |	   | ....	  |
 *	      |				  |
 *	      +- [uep 2 (bulk)]-----------+
 */


/*
 *		struct
 */
struct usbhsh_pipe_info {
	unsigned int		usr_cnt; /* see usbhsh_endpoint_alloc() */
};

struct usbhsh_request {
	struct urb		*urb;
	struct usbhs_pkt	pkt;
	struct list_head	ureq_link; /* see hpriv :: ureq_link_xxx */
};

struct usbhsh_device {
	struct usb_device	*usbv;
	struct list_head	ep_list_head; /* list of usbhsh_ep */
};

struct usbhsh_ep {
	struct usbhs_pipe	*pipe;
	struct usbhsh_device	*udev;   /* attached udev */
	struct list_head	ep_list; /* list to usbhsh_device */

	int maxp;
};

#define USBHSH_DEVICE_MAX	10 /* see DEVADDn / DCPMAXP / PIPEMAXP */
#define USBHSH_PORT_MAX		 7 /* see DEVADDn :: HUBPORT */
struct usbhsh_hpriv {
	struct usbhs_mod	mod;
	struct usbhs_pipe	*dcp;

	struct usbhsh_device	udev[USBHSH_DEVICE_MAX];

	struct usbhsh_pipe_info	*pipe_info;
	int			 pipe_size;

	u32	port_stat;	/* USB_PORT_STAT_xxx */

	struct completion	setup_ack_done;

	/* see usbhsh_req_alloc/free */
	struct list_head	ureq_link_active;
	struct list_head	ureq_link_free;
};


static const char usbhsh_hcd_name[] = "renesas_usbhs host";

/*
 *		macro
 */
#define usbhsh_priv_to_hpriv(priv) \
	container_of(usbhs_mod_get(priv, USBHS_HOST), struct usbhsh_hpriv, mod)

#define __usbhsh_for_each_hpipe(start, pos, h, i)	\
	for (i = start, pos = (h)->hpipe + i;		\
	     i < (h)->hpipe_size;			\
	     i++, pos = (h)->hpipe + i)

#define usbhsh_for_each_hpipe(pos, hpriv, i)	\
	__usbhsh_for_each_hpipe(1, pos, hpriv, i)

#define usbhsh_for_each_hpipe_with_dcp(pos, hpriv, i)	\
	__usbhsh_for_each_hpipe(0, pos, hpriv, i)

#define __usbhsh_for_each_udev(start, pos, h, i)	\
	for (i = start, pos = (h)->udev + i;		\
	     i < USBHSH_DEVICE_MAX;			\
	     i++, pos = (h)->udev + i)

#define usbhsh_for_each_udev(pos, hpriv, i)	\
	__usbhsh_for_each_udev(1, pos, hpriv, i)

#define usbhsh_for_each_udev_with_dev0(pos, hpriv, i)	\
	__usbhsh_for_each_udev(0, pos, hpriv, i)

#define usbhsh_hcd_to_hpriv(h)	(struct usbhsh_hpriv *)((h)->hcd_priv)
#define usbhsh_hcd_to_dev(h)	((h)->self.controller)

#define usbhsh_hpriv_to_priv(h)	((h)->mod.priv)
#define usbhsh_hpriv_to_dcp(h)	((h)->dcp)
#define usbhsh_hpriv_to_hcd(h)	\
	container_of((void *)h, struct usb_hcd, hcd_priv)

#define usbhsh_ep_to_uep(u)	((u)->hcpriv)
#define usbhsh_uep_to_pipe(u)	((u)->pipe)
#define usbhsh_uep_to_udev(u)	((u)->udev)
#define usbhsh_urb_to_ureq(u)	((u)->hcpriv)
#define usbhsh_urb_to_usbv(u)	((u)->dev)

#define usbhsh_usbv_to_udev(d)	dev_get_drvdata(&(d)->dev)

#define usbhsh_udev_to_usbv(h)	((h)->usbv)

#define usbhsh_pipe_info(p)	((p)->mod_private)

#define usbhsh_device_number(h, d)	((int)((d) - (h)->udev))
#define usbhsh_device_nth(h, d)		((h)->udev + d)
#define usbhsh_device0(h)		usbhsh_device_nth(h, 0)

#define usbhsh_port_stat_init(h)	((h)->port_stat = 0)
#define usbhsh_port_stat_set(h, s)	((h)->port_stat |= (s))
#define usbhsh_port_stat_clear(h, s)	((h)->port_stat &= ~(s))
#define usbhsh_port_stat_get(h)		((h)->port_stat)

#define usbhsh_pkt_to_req(p)	\
	container_of((void *)p, struct usbhsh_request, pkt)

/*
 *		req alloc/free
 */
static void usbhsh_req_list_init(struct usbhsh_hpriv *hpriv)
{
	INIT_LIST_HEAD(&hpriv->ureq_link_active);
	INIT_LIST_HEAD(&hpriv->ureq_link_free);
}

static void usbhsh_req_list_quit(struct usbhsh_hpriv *hpriv)
{
	struct usb_hcd *hcd = usbhsh_hpriv_to_hcd(hpriv);
	struct device *dev = usbhsh_hcd_to_dev(hcd);
	struct usbhsh_request *ureq, *next;

	/* kfree all active ureq */
	list_for_each_entry_safe(ureq, next,
				 &hpriv->ureq_link_active,
				 ureq_link) {
		dev_err(dev, "active ureq (%p) is force freed\n", ureq);
		kfree(ureq);
	}

	/* kfree all free ureq */
	list_for_each_entry_safe(ureq, next, &hpriv->ureq_link_free, ureq_link)
		kfree(ureq);
}

static struct usbhsh_request *usbhsh_req_alloc(struct usbhsh_hpriv *hpriv,
					       struct urb *urb,
					       gfp_t mem_flags)
{
	struct usbhsh_request *ureq;
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct device *dev = usbhs_priv_to_dev(priv);

	if (list_empty(&hpriv->ureq_link_free)) {
		/*
		 * create new one if there is no free ureq
		 */
		ureq = kzalloc(sizeof(struct usbhsh_request), mem_flags);
		if (ureq)
			INIT_LIST_HEAD(&ureq->ureq_link);
	} else {
		/*
		 * reuse "free" ureq if exist
		 */
		ureq = list_entry(hpriv->ureq_link_free.next,
				  struct usbhsh_request,
				  ureq_link);
		if (ureq)
			list_del_init(&ureq->ureq_link);
	}

	if (!ureq) {
		dev_err(dev, "ureq alloc fail\n");
		return NULL;
	}

	usbhs_pkt_init(&ureq->pkt);

	/*
	 * push it to "active" list
	 */
	list_add_tail(&ureq->ureq_link, &hpriv->ureq_link_active);
	ureq->urb = urb;

	return ureq;
}

static void usbhsh_req_free(struct usbhsh_hpriv *hpriv,
			    struct usbhsh_request *ureq)
{
	struct usbhs_pkt *pkt = &ureq->pkt;

	usbhs_pkt_init(pkt);

	/*
	 * removed from "active" list,
	 * and push it to "free" list
	 */
	ureq->urb = NULL;
	list_del_init(&ureq->ureq_link);
	list_add_tail(&ureq->ureq_link, &hpriv->ureq_link_free);
}

/*
 *		device control
 */

static int usbhsh_device_has_endpoint(struct usbhsh_device *udev)
{
	return !list_empty(&udev->ep_list_head);
}

static struct usbhsh_device *usbhsh_device_alloc(struct usbhsh_hpriv *hpriv,
						 struct urb *urb)
{
	struct usbhsh_device *udev = NULL;
	struct usb_hcd *hcd = usbhsh_hpriv_to_hcd(hpriv);
	struct device *dev = usbhsh_hcd_to_dev(hcd);
	struct usb_device *usbv = usbhsh_urb_to_usbv(urb);
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	int i;

	/*
	 * device 0
	 */
	if (0 == usb_pipedevice(urb->pipe)) {
		udev = usbhsh_device0(hpriv);
		goto usbhsh_device_find;
	}

	/*
	 * find unused device
	 */
	usbhsh_for_each_udev(udev, hpriv, i) {
		if (usbhsh_udev_to_usbv(udev))
			continue;
		goto usbhsh_device_find;
	}

	dev_err(dev, "no free usbhsh_device\n");

	return NULL;

usbhsh_device_find:
	if (usbhsh_device_has_endpoint(udev))
		dev_warn(dev, "udev have old endpoint\n");

	/* uep will be attached */
	INIT_LIST_HEAD(&udev->ep_list_head);

	/*
	 * usbhsh_usbv_to_udev()
	 * usbhsh_udev_to_usbv()
	 * will be enable
	 */
	dev_set_drvdata(&usbv->dev, udev);
	udev->usbv = usbv;

	/* set device config */
	usbhs_set_device_speed(priv,
			       usbhsh_device_number(hpriv, udev),
			       usbhsh_device_number(hpriv, udev),
			       0, /* FIXME no parent */
			       usbv->speed);

	dev_dbg(dev, "%s [%d](%p)\n", __func__,
		usbhsh_device_number(hpriv, udev), udev);

	return udev;
}

static void usbhsh_device_free(struct usbhsh_hpriv *hpriv,
			       struct usbhsh_device *udev)
{
	struct usb_hcd *hcd = usbhsh_hpriv_to_hcd(hpriv);
	struct device *dev = usbhsh_hcd_to_dev(hcd);
	struct usb_device *usbv = usbhsh_udev_to_usbv(udev);

	dev_dbg(dev, "%s [%d](%p)\n", __func__,
		usbhsh_device_number(hpriv, udev), udev);

	if (usbhsh_device_has_endpoint(udev))
		dev_warn(dev, "udev still have endpoint\n");

	/*
	 * usbhsh_usbv_to_udev()
	 * usbhsh_udev_to_usbv()
	 * will be disable
	 */
	dev_set_drvdata(&usbv->dev, NULL);
	udev->usbv = NULL;
}

/*
 *		end-point control
 */
struct usbhsh_ep *usbhsh_endpoint_alloc(struct usbhsh_hpriv *hpriv,
					struct usbhsh_device *udev,
					struct usb_host_endpoint *ep,
					int dir_in_req,
					gfp_t mem_flags)
{
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct usb_hcd *hcd = usbhsh_hpriv_to_hcd(hpriv);
	struct usbhsh_ep *uep;
	struct usbhsh_pipe_info *info;
	struct usbhs_pipe *pipe, *best_pipe;
	struct device *dev = usbhsh_hcd_to_dev(hcd);
	struct usb_endpoint_descriptor *desc = &ep->desc;
	int type, i, dir_in;
	unsigned int min_usr;

	dir_in_req = !!dir_in_req;

	uep = kzalloc(sizeof(struct usbhsh_ep), mem_flags);
	if (!uep) {
		dev_err(dev, "usbhsh_ep alloc fail\n");
		return NULL;
	}

	if (usb_endpoint_xfer_control(desc)) {
		best_pipe = usbhsh_hpriv_to_dcp(hpriv);
		goto usbhsh_endpoint_alloc_find_pipe;
	}

	/*
	 * find best pipe for endpoint
	 * see
	 *	HARDWARE LIMITATION
	 */
	type = usb_endpoint_type(desc);
	min_usr = ~0;
	best_pipe = NULL;
	usbhs_for_each_pipe(pipe, priv, i) {
		if (!usbhs_pipe_type_is(pipe, type))
			continue;

		dir_in = !!usbhs_pipe_is_dir_in(pipe);
		if (0 != (dir_in - dir_in_req))
			continue;

		info = usbhsh_pipe_info(pipe);

		if (min_usr > info->usr_cnt) {
			min_usr		= info->usr_cnt;
			best_pipe	= pipe;
		}
	}

	if (unlikely(!best_pipe)) {
		dev_err(dev, "couldn't find best pipe\n");
		kfree(uep);
		return NULL;
	}
usbhsh_endpoint_alloc_find_pipe:
	/*
	 * init uep
	 */
	uep->pipe	= best_pipe;
	uep->maxp	= usb_endpoint_maxp(desc);
	usbhsh_uep_to_udev(uep)	= udev;
	usbhsh_ep_to_uep(ep)	= uep;

	/*
	 * update pipe user count
	 */
	info = usbhsh_pipe_info(best_pipe);
	info->usr_cnt++;

	/* init this endpoint, and attach it to udev */
	INIT_LIST_HEAD(&uep->ep_list);
	list_add_tail(&uep->ep_list, &udev->ep_list_head);

	/*
	 * usbhs_pipe_config_update() should be called after
	 * usbhs_device_config()
	 * see
	 *  DCPMAXP/PIPEMAXP
	 */
	usbhs_pipe_sequence_data0(uep->pipe);
	usbhs_pipe_config_update(uep->pipe,
				 usbhsh_device_number(hpriv, udev),
				 usb_endpoint_num(desc),
				 uep->maxp);

	dev_dbg(dev, "%s [%d-%s](%p)\n", __func__,
		usbhsh_device_number(hpriv, udev),
		usbhs_pipe_name(uep->pipe), uep);

	return uep;
}

void usbhsh_endpoint_free(struct usbhsh_hpriv *hpriv,
			  struct usb_host_endpoint *ep)
{
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct device *dev = usbhs_priv_to_dev(priv);
	struct usbhsh_ep *uep = usbhsh_ep_to_uep(ep);
	struct usbhsh_pipe_info *info;

	if (!uep)
		return;

	dev_dbg(dev, "%s [%d-%s](%p)\n", __func__,
		usbhsh_device_number(hpriv, usbhsh_uep_to_udev(uep)),
		usbhs_pipe_name(uep->pipe), uep);

	info = usbhsh_pipe_info(uep->pipe);
	info->usr_cnt--;

	/* remove this endpoint from udev */
	list_del_init(&uep->ep_list);

	usbhsh_uep_to_udev(uep) = NULL;
	usbhsh_ep_to_uep(ep) = NULL;

	kfree(uep);
}

/*
 *		queue push/pop
 */
static void usbhsh_queue_done(struct usbhs_priv *priv, struct usbhs_pkt *pkt)
{
	struct usbhsh_request *ureq = usbhsh_pkt_to_req(pkt);
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct usb_hcd *hcd = usbhsh_hpriv_to_hcd(hpriv);
	struct urb *urb = ureq->urb;
	struct device *dev = usbhs_priv_to_dev(priv);

	dev_dbg(dev, "%s\n", __func__);

	if (!urb) {
		dev_warn(dev, "pkt doesn't have urb\n");
		return;
	}

	urb->actual_length = pkt->actual;
	usbhsh_req_free(hpriv, ureq);
	usbhsh_urb_to_ureq(urb) = NULL;

	usb_hcd_unlink_urb_from_ep(hcd, urb);
	usb_hcd_giveback_urb(hcd, urb, 0);
}

static int usbhsh_queue_push(struct usb_hcd *hcd,
			     struct usbhs_pipe *pipe,
			     struct urb *urb)
{
	struct usbhsh_request *ureq = usbhsh_urb_to_ureq(urb);
	struct usbhs_pkt *pkt = &ureq->pkt;
	struct device *dev = usbhsh_hcd_to_dev(hcd);
	void *buf;
	int len;

	if (usb_pipeisoc(urb->pipe)) {
		dev_err(dev, "pipe iso is not supported now\n");
		return -EIO;
	}

	if (usb_pipein(urb->pipe))
		pipe->handler = &usbhs_fifo_pio_pop_handler;
	else
		pipe->handler = &usbhs_fifo_pio_push_handler;

	buf = (void *)(urb->transfer_buffer + urb->actual_length);
	len = urb->transfer_buffer_length - urb->actual_length;

	dev_dbg(dev, "%s\n", __func__);
	usbhs_pkt_push(pipe, pkt, usbhsh_queue_done,
		       buf, len, (urb->transfer_flags & URB_ZERO_PACKET));
	usbhs_pkt_start(pipe);

	return 0;
}

/*
 *		DCP setup stage
 */
static int usbhsh_is_request_address(struct urb *urb)
{
	struct usb_ctrlrequest *cmd;

	cmd = (struct usb_ctrlrequest *)urb->setup_packet;

	if ((DeviceOutRequest    == cmd->bRequestType << 8) &&
	    (USB_REQ_SET_ADDRESS == cmd->bRequest))
		return 1;
	else
		return 0;
}

static void usbhsh_setup_stage_packet_push(struct usbhsh_hpriv *hpriv,
					   struct urb *urb,
					   struct usbhs_pipe *pipe)
{
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct usb_ctrlrequest req;
	struct device *dev = usbhs_priv_to_dev(priv);

	/*
	 * wait setup packet ACK
	 * see
	 *	usbhsh_irq_setup_ack()
	 *	usbhsh_irq_setup_err()
	 */
	init_completion(&hpriv->setup_ack_done);

	/* copy original request */
	memcpy(&req, urb->setup_packet, sizeof(struct usb_ctrlrequest));

	/*
	 * renesas_usbhs can not use original usb address.
	 * see HARDWARE LIMITATION.
	 * modify usb address here.
	 */
	if (usbhsh_is_request_address(urb)) {
		/* FIXME */
		req.wValue = 1;
		dev_dbg(dev, "create new address - %d\n", req.wValue);
	}

	/* set request */
	usbhs_usbreq_set_val(priv, &req);

	/*
	 * wait setup packet ACK
	 */
	wait_for_completion(&hpriv->setup_ack_done);

	dev_dbg(dev, "%s done\n", __func__);
}

/*
 *		DCP data stage
 */
static void usbhsh_data_stage_packet_done(struct usbhs_priv *priv,
					  struct usbhs_pkt *pkt)
{
	struct usbhsh_request *ureq = usbhsh_pkt_to_req(pkt);
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct urb *urb = ureq->urb;

	/* this ureq was connected to urb when usbhsh_urb_enqueue()  */

	usbhsh_req_free(hpriv, ureq);
	usbhsh_urb_to_ureq(urb) = NULL;
}

static void usbhsh_data_stage_packet_push(struct usbhsh_hpriv *hpriv,
					  struct urb *urb,
					  struct usbhs_pipe *pipe)
{
	struct usbhsh_request *ureq;
	struct usbhs_pkt *pkt;

	/*
	 * FIXME
	 *
	 * data stage uses ureq which is connected to urb
	 * see usbhsh_urb_enqueue() :: alloc new request.
	 * it will be freed in usbhsh_data_stage_packet_done()
	 */
	ureq	= usbhsh_urb_to_ureq(urb);
	pkt	= &ureq->pkt;

	if (usb_pipein(urb->pipe))
		pipe->handler = &usbhs_dcp_data_stage_in_handler;
	else
		pipe->handler = &usbhs_dcp_data_stage_out_handler;

	usbhs_pkt_push(pipe, pkt,
		       usbhsh_data_stage_packet_done,
		       urb->transfer_buffer,
		       urb->transfer_buffer_length,
		       (urb->transfer_flags & URB_ZERO_PACKET));
}

/*
 *		DCP status stage
 */
static void usbhsh_status_stage_packet_push(struct usbhsh_hpriv *hpriv,
					    struct urb *urb,
					    struct usbhs_pipe *pipe)
{
	struct usbhsh_request *ureq;
	struct usbhs_pkt *pkt;

	/*
	 * FIXME
	 *
	 * status stage uses allocated ureq.
	 * it will be freed on usbhsh_queue_done()
	 */
	ureq	= usbhsh_req_alloc(hpriv, urb, GFP_KERNEL);
	pkt	= &ureq->pkt;

	if (usb_pipein(urb->pipe))
		pipe->handler = &usbhs_dcp_status_stage_in_handler;
	else
		pipe->handler = &usbhs_dcp_status_stage_out_handler;

	usbhs_pkt_push(pipe, pkt,
		       usbhsh_queue_done,
		       NULL,
		       urb->transfer_buffer_length,
		       0);
}

static int usbhsh_dcp_queue_push(struct usb_hcd *hcd,
				 struct usbhsh_hpriv *hpriv,
				 struct usbhs_pipe *pipe,
				 struct urb *urb)
{
	struct device *dev = usbhsh_hcd_to_dev(hcd);

	dev_dbg(dev, "%s\n", __func__);

	/*
	 * setup stage
	 *
	 * usbhsh_send_setup_stage_packet() wait SACK/SIGN
	 */
	usbhsh_setup_stage_packet_push(hpriv, urb, pipe);

	/*
	 * data stage
	 *
	 * It is pushed only when urb has buffer.
	 */
	if (urb->transfer_buffer_length)
		usbhsh_data_stage_packet_push(hpriv, urb, pipe);

	/*
	 * status stage
	 */
	usbhsh_status_stage_packet_push(hpriv, urb, pipe);

	/*
	 * start pushed packets
	 */
	usbhs_pkt_start(pipe);

	return 0;
}

/*
 *		dma map functions
 */
static int usbhsh_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
{
	return 0;
}

/*
 *		for hc_driver
 */
static int usbhsh_host_start(struct usb_hcd *hcd)
{
	return 0;
}

static void usbhsh_host_stop(struct usb_hcd *hcd)
{
}

static int usbhsh_urb_enqueue(struct usb_hcd *hcd,
			      struct urb *urb,
			      gfp_t mem_flags)
{
	struct usbhsh_hpriv *hpriv = usbhsh_hcd_to_hpriv(hcd);
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct device *dev = usbhs_priv_to_dev(priv);
	struct usb_device *usbv = usbhsh_urb_to_usbv(urb);
	struct usb_host_endpoint *ep = urb->ep;
	struct usbhsh_request *ureq;
	struct usbhsh_device *udev, *new_udev = NULL;
	struct usbhs_pipe *pipe;
	struct usbhsh_ep *uep;
	int is_dir_in = usb_pipein(urb->pipe);

	int ret;

	dev_dbg(dev, "%s (%s)\n", __func__, is_dir_in ? "in" : "out");

	ret = usb_hcd_link_urb_to_ep(hcd, urb);
	if (ret)
		goto usbhsh_urb_enqueue_error_not_linked;

	/*
	 * get udev
	 */
	udev = usbhsh_usbv_to_udev(usbv);
	if (!udev) {
		new_udev = usbhsh_device_alloc(hpriv, urb);
		if (!new_udev)
			goto usbhsh_urb_enqueue_error_not_linked;

		udev = new_udev;
	}

	/*
	 * get uep
	 */
	uep = usbhsh_ep_to_uep(ep);
	if (!uep) {
		uep = usbhsh_endpoint_alloc(hpriv, udev, ep,
					    is_dir_in, mem_flags);
		if (!uep)
			goto usbhsh_urb_enqueue_error_free_device;
	}
	pipe = usbhsh_uep_to_pipe(uep);

	/*
	 * alloc new request
	 */
	ureq = usbhsh_req_alloc(hpriv, urb, mem_flags);
	if (unlikely(!ureq)) {
		ret = -ENOMEM;
		goto usbhsh_urb_enqueue_error_free_endpoint;
	}
	usbhsh_urb_to_ureq(urb) = ureq;

	/*
	 * push packet
	 */
	if (usb_pipecontrol(urb->pipe))
		usbhsh_dcp_queue_push(hcd, hpriv, pipe, urb);
	else
		usbhsh_queue_push(hcd, pipe, urb);

	return 0;

usbhsh_urb_enqueue_error_free_endpoint:
	usbhsh_endpoint_free(hpriv, ep);
usbhsh_urb_enqueue_error_free_device:
	if (new_udev)
		usbhsh_device_free(hpriv, new_udev);
usbhsh_urb_enqueue_error_not_linked:

	dev_dbg(dev, "%s error\n", __func__);

	return ret;
}

static int usbhsh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
	struct usbhsh_hpriv *hpriv = usbhsh_hcd_to_hpriv(hcd);
	struct usbhsh_request *ureq = usbhsh_urb_to_ureq(urb);

	if (ureq) {
		usbhsh_req_free(hpriv, ureq);
		usbhsh_urb_to_ureq(urb) = NULL;
	}

	return 0;
}

static void usbhsh_endpoint_disable(struct usb_hcd *hcd,
				    struct usb_host_endpoint *ep)
{
	struct usbhsh_ep *uep = usbhsh_ep_to_uep(ep);
	struct usbhsh_device *udev;
	struct usbhsh_hpriv *hpriv;

	/*
	 * this function might be called manytimes by same hcd/ep
	 * in-endpoitn == out-endpoint if ep == dcp.
	 */
	if (!uep)
		return;

	udev	= usbhsh_uep_to_udev(uep);
	hpriv	= usbhsh_hcd_to_hpriv(hcd);

	usbhsh_endpoint_free(hpriv, ep);
	ep->hcpriv = NULL;

	/*
	 * if there is no endpoint,
	 * free device
	 */
	if (!usbhsh_device_has_endpoint(udev))
		usbhsh_device_free(hpriv, udev);
}

static int usbhsh_hub_status_data(struct usb_hcd *hcd, char *buf)
{
	struct usbhsh_hpriv *hpriv = usbhsh_hcd_to_hpriv(hcd);
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct device *dev = usbhs_priv_to_dev(priv);
	int roothub_id = 1; /* only 1 root hub */

	/*
	 * does port stat was changed ?
	 * check USB_PORT_STAT_C_xxx << 16
	 */
	if (usbhsh_port_stat_get(hpriv) & 0xFFFF0000)
		*buf = (1 << roothub_id);
	else
		*buf = 0;

	dev_dbg(dev, "%s (%02x)\n", __func__, *buf);

	return !!(*buf);
}

static int __usbhsh_hub_hub_feature(struct usbhsh_hpriv *hpriv,
				    u16 typeReq, u16 wValue,
				    u16 wIndex, char *buf, u16 wLength)
{
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct device *dev = usbhs_priv_to_dev(priv);

	switch (wValue) {
	case C_HUB_OVER_CURRENT:
	case C_HUB_LOCAL_POWER:
		dev_dbg(dev, "%s :: C_HUB_xx\n", __func__);
		return 0;
	}

	return -EPIPE;
}

static int __usbhsh_hub_port_feature(struct usbhsh_hpriv *hpriv,
				     u16 typeReq, u16 wValue,
				     u16 wIndex, char *buf, u16 wLength)
{
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct device *dev = usbhs_priv_to_dev(priv);
	int enable = (typeReq == SetPortFeature);
	int speed, i, timeout = 128;
	int roothub_id = 1; /* only 1 root hub */

	/* common error */
	if (wIndex > roothub_id || wLength != 0)
		return -EPIPE;

	/* check wValue */
	switch (wValue) {
	case USB_PORT_FEAT_POWER:
		usbhs_vbus_ctrl(priv, enable);
		dev_dbg(dev, "%s :: USB_PORT_FEAT_POWER\n", __func__);
		break;

	case USB_PORT_FEAT_ENABLE:
	case USB_PORT_FEAT_SUSPEND:
	case USB_PORT_FEAT_C_ENABLE:
	case USB_PORT_FEAT_C_SUSPEND:
	case USB_PORT_FEAT_C_CONNECTION:
	case USB_PORT_FEAT_C_OVER_CURRENT:
	case USB_PORT_FEAT_C_RESET:
		dev_dbg(dev, "%s :: USB_PORT_FEAT_xxx\n", __func__);
		break;

	case USB_PORT_FEAT_RESET:
		if (!enable)
			break;

		usbhsh_port_stat_clear(hpriv,
				       USB_PORT_STAT_HIGH_SPEED |
				       USB_PORT_STAT_LOW_SPEED);

		usbhs_bus_send_reset(priv);
		msleep(20);
		usbhs_bus_send_sof_enable(priv);

		for (i = 0; i < timeout ; i++) {
			switch (usbhs_bus_get_speed(priv)) {
			case USB_SPEED_LOW:
				speed = USB_PORT_STAT_LOW_SPEED;
				goto got_usb_bus_speed;
			case USB_SPEED_HIGH:
				speed = USB_PORT_STAT_HIGH_SPEED;
				goto got_usb_bus_speed;
			case USB_SPEED_FULL:
				speed = 0;
				goto got_usb_bus_speed;
			}

			msleep(20);
		}
		return -EPIPE;

got_usb_bus_speed:
		usbhsh_port_stat_set(hpriv, speed);
		usbhsh_port_stat_set(hpriv, USB_PORT_STAT_ENABLE);

		dev_dbg(dev, "%s :: USB_PORT_FEAT_RESET (speed = %d)\n",
			__func__, speed);

		/* status change is not needed */
		return 0;

	default:
		return -EPIPE;
	}

	/* set/clear status */
	if (enable)
		usbhsh_port_stat_set(hpriv, (1 << wValue));
	else
		usbhsh_port_stat_clear(hpriv, (1 << wValue));

	return 0;
}

static int __usbhsh_hub_get_status(struct usbhsh_hpriv *hpriv,
				   u16 typeReq, u16 wValue,
				   u16 wIndex, char *buf, u16 wLength)
{
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct usb_hub_descriptor *desc = (struct usb_hub_descriptor *)buf;
	struct device *dev = usbhs_priv_to_dev(priv);
	int roothub_id = 1; /* only 1 root hub */

	switch (typeReq) {
	case GetHubStatus:
		dev_dbg(dev, "%s :: GetHubStatus\n", __func__);

		*buf = 0x00;
		break;

	case GetPortStatus:
		if (wIndex != roothub_id)
			return -EPIPE;

		dev_dbg(dev, "%s :: GetPortStatus\n", __func__);
		*(__le32 *)buf = cpu_to_le32(usbhsh_port_stat_get(hpriv));
		break;

	case GetHubDescriptor:
		desc->bDescriptorType		= 0x29;
		desc->bHubContrCurrent		= 0;
		desc->bNbrPorts			= roothub_id;
		desc->bDescLength		= 9;
		desc->bPwrOn2PwrGood		= 0;
		desc->wHubCharacteristics	= cpu_to_le16(0x0011);
		desc->u.hs.DeviceRemovable[0]	= (roothub_id << 1);
		desc->u.hs.DeviceRemovable[1]	= ~0;
		dev_dbg(dev, "%s :: GetHubDescriptor\n", __func__);
		break;
	}

	return 0;
}

static int usbhsh_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
			      u16 wIndex, char *buf, u16 wLength)
{
	struct usbhsh_hpriv *hpriv = usbhsh_hcd_to_hpriv(hcd);
	struct usbhs_priv *priv = usbhsh_hpriv_to_priv(hpriv);
	struct device *dev = usbhs_priv_to_dev(priv);
	int ret = -EPIPE;

	switch (typeReq) {

	/* Hub Feature */
	case ClearHubFeature:
	case SetHubFeature:
		ret = __usbhsh_hub_hub_feature(hpriv, typeReq,
					       wValue, wIndex, buf, wLength);
		break;

	/* Port Feature */
	case SetPortFeature:
	case ClearPortFeature:
		ret = __usbhsh_hub_port_feature(hpriv, typeReq,
						wValue, wIndex, buf, wLength);
		break;

	/* Get status */
	case GetHubStatus:
	case GetPortStatus:
	case GetHubDescriptor:
		ret = __usbhsh_hub_get_status(hpriv, typeReq,
					      wValue, wIndex, buf, wLength);
		break;
	}

	dev_dbg(dev, "typeReq = %x, ret = %d, port_stat = %x\n",
		typeReq, ret, usbhsh_port_stat_get(hpriv));

	return ret;
}

static struct hc_driver usbhsh_driver = {
	.description =		usbhsh_hcd_name,
	.hcd_priv_size =	sizeof(struct usbhsh_hpriv),

	/*
	 * generic hardware linkage
	 */
	.flags =		HCD_USB2,

	.start =		usbhsh_host_start,
	.stop =			usbhsh_host_stop,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue =		usbhsh_urb_enqueue,
	.urb_dequeue =		usbhsh_urb_dequeue,
	.endpoint_disable =	usbhsh_endpoint_disable,

	/*
	 * root hub
	 */
	.hub_status_data =	usbhsh_hub_status_data,
	.hub_control =		usbhsh_hub_control,
};

/*
 *		interrupt functions
 */
static int usbhsh_irq_attch(struct usbhs_priv *priv,
			    struct usbhs_irq_state *irq_state)
{
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct device *dev = usbhs_priv_to_dev(priv);

	dev_dbg(dev, "device attached\n");

	usbhsh_port_stat_set(hpriv, USB_PORT_STAT_CONNECTION);
	usbhsh_port_stat_set(hpriv, USB_PORT_STAT_C_CONNECTION << 16);

	return 0;
}

static int usbhsh_irq_dtch(struct usbhs_priv *priv,
			   struct usbhs_irq_state *irq_state)
{
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct device *dev = usbhs_priv_to_dev(priv);

	dev_dbg(dev, "device detached\n");

	usbhsh_port_stat_clear(hpriv, USB_PORT_STAT_CONNECTION);
	usbhsh_port_stat_set(hpriv, USB_PORT_STAT_C_CONNECTION << 16);

	return 0;
}

static int usbhsh_irq_setup_ack(struct usbhs_priv *priv,
				struct usbhs_irq_state *irq_state)
{
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct device *dev = usbhs_priv_to_dev(priv);

	dev_dbg(dev, "setup packet OK\n");

	complete(&hpriv->setup_ack_done); /* see usbhsh_urb_enqueue() */

	return 0;
}

static int usbhsh_irq_setup_err(struct usbhs_priv *priv,
				struct usbhs_irq_state *irq_state)
{
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct device *dev = usbhs_priv_to_dev(priv);

	dev_dbg(dev, "setup packet Err\n");

	complete(&hpriv->setup_ack_done); /* see usbhsh_urb_enqueue() */

	return 0;
}

/*
 *		module start/stop
 */
static void usbhsh_pipe_init_for_host(struct usbhs_priv *priv)
{
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct usbhsh_pipe_info *pipe_info = hpriv->pipe_info;
	struct usbhs_pipe *pipe;
	u32 *pipe_type = usbhs_get_dparam(priv, pipe_type);
	int pipe_size = usbhs_get_dparam(priv, pipe_size);
	int old_type, dir_in, i;

	/* init all pipe */
	old_type = USB_ENDPOINT_XFER_CONTROL;
	for (i = 0; i < pipe_size; i++) {
		pipe_info[i].usr_cnt	= 0;

		/*
		 * data "output" will be finished as soon as possible,
		 * but there is no guaranty at data "input" case.
		 *
		 * "input" needs "standby" pipe.
		 * So, "input" direction pipe > "output" direction pipe
		 * is good idea.
		 *
		 * 1st USB_ENDPOINT_XFER_xxx will be output direction,
		 * and the other will be input direction here.
		 *
		 * ex)
		 * ...
		 * USB_ENDPOINT_XFER_ISOC -> dir out
		 * USB_ENDPOINT_XFER_ISOC -> dir in
		 * USB_ENDPOINT_XFER_BULK -> dir out
		 * USB_ENDPOINT_XFER_BULK -> dir in
		 * USB_ENDPOINT_XFER_BULK -> dir in
		 * ...
		 */
		dir_in = (pipe_type[i] == old_type);
		old_type = pipe_type[i];

		if (USB_ENDPOINT_XFER_CONTROL == pipe_type[i]) {
			pipe = usbhs_dcp_malloc(priv);
			usbhsh_hpriv_to_dcp(hpriv) = pipe;
		} else {
			pipe = usbhs_pipe_malloc(priv,
						 pipe_type[i],
						 dir_in);
		}

		pipe->mod_private = pipe_info + i;
	}
}

static int usbhsh_start(struct usbhs_priv *priv)
{
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct usb_hcd *hcd = usbhsh_hpriv_to_hcd(hpriv);
	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
	struct device *dev = usbhs_priv_to_dev(priv);
	int ret;

	/* add hcd */
	ret = usb_add_hcd(hcd, 0, 0);
	if (ret < 0)
		return 0;

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

	/*
	 * system config enble
	 * - HI speed
	 * - host
	 * - usb module
	 */
	usbhs_sys_hispeed_ctrl(priv, 1);
	usbhs_sys_host_ctrl(priv, 1);
	usbhs_sys_usb_ctrl(priv, 1);

	/*
	 * enable irq callback
	 */
	mod->irq_attch		= usbhsh_irq_attch;
	mod->irq_dtch		= usbhsh_irq_dtch;
	mod->irq_sack		= usbhsh_irq_setup_ack;
	mod->irq_sign		= usbhsh_irq_setup_err;
	usbhs_irq_callback_update(priv, mod);

	dev_dbg(dev, "start host\n");

	return ret;
}

static int usbhsh_stop(struct usbhs_priv *priv)
{
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct usb_hcd *hcd = usbhsh_hpriv_to_hcd(hpriv);
	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
	struct device *dev = usbhs_priv_to_dev(priv);

	/*
	 * disable irq callback
	 */
	mod->irq_attch	= NULL;
	mod->irq_dtch	= NULL;
	mod->irq_sack	= NULL;
	mod->irq_sign	= NULL;
	usbhs_irq_callback_update(priv, mod);

	usb_remove_hcd(hcd);

	/* disable sys */
	usbhs_sys_hispeed_ctrl(priv, 0);
	usbhs_sys_host_ctrl(priv, 0);
	usbhs_sys_usb_ctrl(priv, 0);

	dev_dbg(dev, "quit host\n");

	return 0;
}

int usbhs_mod_host_probe(struct usbhs_priv *priv)
{
	struct usbhsh_hpriv *hpriv;
	struct usb_hcd *hcd;
	struct usbhsh_pipe_info *pipe_info;
	struct usbhsh_device *udev;
	struct device *dev = usbhs_priv_to_dev(priv);
	int pipe_size = usbhs_get_dparam(priv, pipe_size);
	int i;

	/* initialize hcd */
	hcd = usb_create_hcd(&usbhsh_driver, dev, usbhsh_hcd_name);
	if (!hcd) {
		dev_err(dev, "Failed to create hcd\n");
		return -ENOMEM;
	}
	hcd->has_tt = 1; /* for low/full speed */

	pipe_info = kzalloc(sizeof(*pipe_info) * pipe_size, GFP_KERNEL);
	if (!pipe_info) {
		dev_err(dev, "Could not allocate pipe_info\n");
		goto usbhs_mod_host_probe_err;
	}

	/*
	 * 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 "usbhsh_start"
	 */

	hpriv = usbhsh_hcd_to_hpriv(hcd);

	/*
	 * register itself
	 */
	usbhs_mod_register(priv, &hpriv->mod, USBHS_HOST);

	/* init hpriv */
	hpriv->mod.name		= "host";
	hpriv->mod.start	= usbhsh_start;
	hpriv->mod.stop		= usbhsh_stop;
	hpriv->pipe_info	= pipe_info;
	hpriv->pipe_size	= pipe_size;
	usbhsh_req_list_init(hpriv);
	usbhsh_port_stat_init(hpriv);

	/* init all device */
	usbhsh_for_each_udev_with_dev0(udev, hpriv, i) {
		udev->usbv	= NULL;
		INIT_LIST_HEAD(&udev->ep_list_head);
	}

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

	return 0;

usbhs_mod_host_probe_err:
	usb_put_hcd(hcd);

	return -ENOMEM;
}

int usbhs_mod_host_remove(struct usbhs_priv *priv)
{
	struct usbhsh_hpriv *hpriv = usbhsh_priv_to_hpriv(priv);
	struct usb_hcd *hcd = usbhsh_hpriv_to_hcd(hpriv);

	usbhsh_req_list_quit(hpriv);

	usb_put_hcd(hcd);

	return 0;
}