summaryrefslogtreecommitdiff
path: root/drivers/usb/gadget/s3c-hsudc.c
blob: 1a1a41498db20545264dbfbf46f930e5cd735b8d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
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
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
/* linux/drivers/usb/gadget/s3c-hsudc.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com/
 *
 * S3C24XX USB 2.0 High-speed USB controller gadget driver
 *
 * The S3C24XX USB 2.0 high-speed USB controller supports upto 9 endpoints.
 * Each endpoint can be configured as either in or out endpoint. Endpoints
 * can be configured for Bulk or Interrupt transfer mode.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
#include <linux/prefetch.h>
#include <linux/platform_data/s3c-hsudc.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>

#include <mach/regs-s3c2443-clock.h>

#define S3C_HSUDC_REG(x)	(x)

/* Non-Indexed Registers */
#define S3C_IR				S3C_HSUDC_REG(0x00) /* Index Register */
#define S3C_EIR				S3C_HSUDC_REG(0x04) /* EP Intr Status */
#define S3C_EIR_EP0			(1<<0)
#define S3C_EIER			S3C_HSUDC_REG(0x08) /* EP Intr Enable */
#define S3C_FAR				S3C_HSUDC_REG(0x0c) /* Gadget Address */
#define S3C_FNR				S3C_HSUDC_REG(0x10) /* Frame Number */
#define S3C_EDR				S3C_HSUDC_REG(0x14) /* EP Direction */
#define S3C_TR				S3C_HSUDC_REG(0x18) /* Test Register */
#define S3C_SSR				S3C_HSUDC_REG(0x1c) /* System Status */
#define S3C_SSR_DTZIEN_EN		(0xff8f)
#define S3C_SSR_ERR			(0xff80)
#define S3C_SSR_VBUSON			(1 << 8)
#define S3C_SSR_HSP			(1 << 4)
#define S3C_SSR_SDE			(1 << 3)
#define S3C_SSR_RESUME			(1 << 2)
#define S3C_SSR_SUSPEND			(1 << 1)
#define S3C_SSR_RESET			(1 << 0)
#define S3C_SCR				S3C_HSUDC_REG(0x20) /* System Control */
#define S3C_SCR_DTZIEN_EN		(1 << 14)
#define S3C_SCR_RRD_EN			(1 << 5)
#define S3C_SCR_SUS_EN			(1 << 1)
#define S3C_SCR_RST_EN			(1 << 0)
#define S3C_EP0SR			S3C_HSUDC_REG(0x24) /* EP0 Status */
#define S3C_EP0SR_EP0_LWO		(1 << 6)
#define S3C_EP0SR_STALL			(1 << 4)
#define S3C_EP0SR_TX_SUCCESS		(1 << 1)
#define S3C_EP0SR_RX_SUCCESS		(1 << 0)
#define S3C_EP0CR			S3C_HSUDC_REG(0x28) /* EP0 Control */
#define S3C_BR(_x)			S3C_HSUDC_REG(0x60 + (_x * 4))

/* Indexed Registers */
#define S3C_ESR				S3C_HSUDC_REG(0x2c) /* EPn Status */
#define S3C_ESR_FLUSH			(1 << 6)
#define S3C_ESR_STALL			(1 << 5)
#define S3C_ESR_LWO			(1 << 4)
#define S3C_ESR_PSIF_ONE		(1 << 2)
#define S3C_ESR_PSIF_TWO		(2 << 2)
#define S3C_ESR_TX_SUCCESS		(1 << 1)
#define S3C_ESR_RX_SUCCESS		(1 << 0)
#define S3C_ECR				S3C_HSUDC_REG(0x30) /* EPn Control */
#define S3C_ECR_DUEN			(1 << 7)
#define S3C_ECR_FLUSH			(1 << 6)
#define S3C_ECR_STALL			(1 << 1)
#define S3C_ECR_IEMS			(1 << 0)
#define S3C_BRCR			S3C_HSUDC_REG(0x34) /* Read Count */
#define S3C_BWCR			S3C_HSUDC_REG(0x38) /* Write Count */
#define S3C_MPR				S3C_HSUDC_REG(0x3c) /* Max Pkt Size */

#define WAIT_FOR_SETUP			(0)
#define DATA_STATE_XMIT			(1)
#define DATA_STATE_RECV			(2)

static const char * const s3c_hsudc_supply_names[] = {
	"vdda",		/* analog phy supply, 3.3V */
	"vddi",		/* digital phy supply, 1.2V */
	"vddosc",	/* oscillator supply, 1.8V - 3.3V */
};

/**
 * struct s3c_hsudc_ep - Endpoint representation used by driver.
 * @ep: USB gadget layer representation of device endpoint.
 * @name: Endpoint name (as required by ep autoconfiguration).
 * @dev: Reference to the device controller to which this EP belongs.
 * @desc: Endpoint descriptor obtained from the gadget driver.
 * @queue: Transfer request queue for the endpoint.
 * @stopped: Maintains state of endpoint, set if EP is halted.
 * @bEndpointAddress: EP address (including direction bit).
 * @fifo: Base address of EP FIFO.
 */
struct s3c_hsudc_ep {
	struct usb_ep ep;
	char name[20];
	struct s3c_hsudc *dev;
	struct list_head queue;
	u8 stopped;
	u8 wedge;
	u8 bEndpointAddress;
	void __iomem *fifo;
};

/**
 * struct s3c_hsudc_req - Driver encapsulation of USB gadget transfer request.
 * @req: Reference to USB gadget transfer request.
 * @queue: Used for inserting this request to the endpoint request queue.
 */
struct s3c_hsudc_req {
	struct usb_request req;
	struct list_head queue;
};

/**
 * struct s3c_hsudc - Driver's abstraction of the device controller.
 * @gadget: Instance of usb_gadget which is referenced by gadget driver.
 * @driver: Reference to currenty active gadget driver.
 * @dev: The device reference used by probe function.
 * @lock: Lock to synchronize the usage of Endpoints (EP's are indexed).
 * @regs: Remapped base address of controller's register space.
 * irq: IRQ number used by the controller.
 * uclk: Reference to the controller clock.
 * ep0state: Current state of EP0.
 * ep: List of endpoints supported by the controller.
 */
struct s3c_hsudc {
	struct usb_gadget gadget;
	struct usb_gadget_driver *driver;
	struct device *dev;
	struct s3c24xx_hsudc_platdata *pd;
	struct usb_phy *transceiver;
	struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsudc_supply_names)];
	spinlock_t lock;
	void __iomem *regs;
	int irq;
	struct clk *uclk;
	int ep0state;
	struct s3c_hsudc_ep ep[];
};

#define ep_maxpacket(_ep)	((_ep)->ep.maxpacket)
#define ep_is_in(_ep)		((_ep)->bEndpointAddress & USB_DIR_IN)
#define ep_index(_ep)		((_ep)->bEndpointAddress & \
					USB_ENDPOINT_NUMBER_MASK)

static const char driver_name[] = "s3c-udc";
static const char ep0name[] = "ep0-control";

static inline struct s3c_hsudc_req *our_req(struct usb_request *req)
{
	return container_of(req, struct s3c_hsudc_req, req);
}

static inline struct s3c_hsudc_ep *our_ep(struct usb_ep *ep)
{
	return container_of(ep, struct s3c_hsudc_ep, ep);
}

static inline struct s3c_hsudc *to_hsudc(struct usb_gadget *gadget)
{
	return container_of(gadget, struct s3c_hsudc, gadget);
}

static inline void set_index(struct s3c_hsudc *hsudc, int ep_addr)
{
	ep_addr &= USB_ENDPOINT_NUMBER_MASK;
	writel(ep_addr, hsudc->regs + S3C_IR);
}

static inline void __orr32(void __iomem *ptr, u32 val)
{
	writel(readl(ptr) | val, ptr);
}

static void s3c_hsudc_init_phy(void)
{
	u32 cfg;

	cfg = readl(S3C2443_PWRCFG) | S3C2443_PWRCFG_USBPHY;
	writel(cfg, S3C2443_PWRCFG);

	cfg = readl(S3C2443_URSTCON);
	cfg |= (S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
	writel(cfg, S3C2443_URSTCON);
	mdelay(1);

	cfg = readl(S3C2443_URSTCON);
	cfg &= ~(S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
	writel(cfg, S3C2443_URSTCON);

	cfg = readl(S3C2443_PHYCTRL);
	cfg &= ~(S3C2443_PHYCTRL_CLKSEL | S3C2443_PHYCTRL_DSPORT);
	cfg |= (S3C2443_PHYCTRL_EXTCLK | S3C2443_PHYCTRL_PLLSEL);
	writel(cfg, S3C2443_PHYCTRL);

	cfg = readl(S3C2443_PHYPWR);
	cfg &= ~(S3C2443_PHYPWR_FSUSPEND | S3C2443_PHYPWR_PLL_PWRDN |
		S3C2443_PHYPWR_XO_ON | S3C2443_PHYPWR_PLL_REFCLK |
		S3C2443_PHYPWR_ANALOG_PD);
	cfg |= S3C2443_PHYPWR_COMMON_ON;
	writel(cfg, S3C2443_PHYPWR);

	cfg = readl(S3C2443_UCLKCON);
	cfg |= (S3C2443_UCLKCON_DETECT_VBUS | S3C2443_UCLKCON_FUNC_CLKEN |
		S3C2443_UCLKCON_TCLKEN);
	writel(cfg, S3C2443_UCLKCON);
}

static void s3c_hsudc_uninit_phy(void)
{
	u32 cfg;

	cfg = readl(S3C2443_PWRCFG) & ~S3C2443_PWRCFG_USBPHY;
	writel(cfg, S3C2443_PWRCFG);

	writel(S3C2443_PHYPWR_FSUSPEND, S3C2443_PHYPWR);

	cfg = readl(S3C2443_UCLKCON) & ~S3C2443_UCLKCON_FUNC_CLKEN;
	writel(cfg, S3C2443_UCLKCON);
}

/**
 * s3c_hsudc_complete_request - Complete a transfer request.
 * @hsep: Endpoint to which the request belongs.
 * @hsreq: Transfer request to be completed.
 * @status: Transfer completion status for the transfer request.
 */
static void s3c_hsudc_complete_request(struct s3c_hsudc_ep *hsep,
				struct s3c_hsudc_req *hsreq, int status)
{
	unsigned int stopped = hsep->stopped;
	struct s3c_hsudc *hsudc = hsep->dev;

	list_del_init(&hsreq->queue);
	hsreq->req.status = status;

	if (!ep_index(hsep)) {
		hsudc->ep0state = WAIT_FOR_SETUP;
		hsep->bEndpointAddress &= ~USB_DIR_IN;
	}

	hsep->stopped = 1;
	spin_unlock(&hsudc->lock);
	if (hsreq->req.complete != NULL)
		hsreq->req.complete(&hsep->ep, &hsreq->req);
	spin_lock(&hsudc->lock);
	hsep->stopped = stopped;
}

/**
 * s3c_hsudc_nuke_ep - Terminate all requests queued for a endpoint.
 * @hsep: Endpoint for which queued requests have to be terminated.
 * @status: Transfer completion status for the transfer request.
 */
static void s3c_hsudc_nuke_ep(struct s3c_hsudc_ep *hsep, int status)
{
	struct s3c_hsudc_req *hsreq;

	while (!list_empty(&hsep->queue)) {
		hsreq = list_entry(hsep->queue.next,
				struct s3c_hsudc_req, queue);
		s3c_hsudc_complete_request(hsep, hsreq, status);
	}
}

/**
 * s3c_hsudc_stop_activity - Stop activity on all endpoints.
 * @hsudc: Device controller for which EP activity is to be stopped.
 *
 * All the endpoints are stopped and any pending transfer requests if any on
 * the endpoint are terminated.
 */
static void s3c_hsudc_stop_activity(struct s3c_hsudc *hsudc)
{
	struct s3c_hsudc_ep *hsep;
	int epnum;

	hsudc->gadget.speed = USB_SPEED_UNKNOWN;

	for (epnum = 0; epnum < hsudc->pd->epnum; epnum++) {
		hsep = &hsudc->ep[epnum];
		hsep->stopped = 1;
		s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN);
	}
}

/**
 * s3c_hsudc_read_setup_pkt - Read the received setup packet from EP0 fifo.
 * @hsudc: Device controller from which setup packet is to be read.
 * @buf: The buffer into which the setup packet is read.
 *
 * The setup packet received in the EP0 fifo is read and stored into a
 * given buffer address.
 */

static void s3c_hsudc_read_setup_pkt(struct s3c_hsudc *hsudc, u16 *buf)
{
	int count;

	count = readl(hsudc->regs + S3C_BRCR);
	while (count--)
		*buf++ = (u16)readl(hsudc->regs + S3C_BR(0));

	writel(S3C_EP0SR_RX_SUCCESS, hsudc->regs + S3C_EP0SR);
}

/**
 * s3c_hsudc_write_fifo - Write next chunk of transfer data to EP fifo.
 * @hsep: Endpoint to which the data is to be written.
 * @hsreq: Transfer request from which the next chunk of data is written.
 *
 * Write the next chunk of data from a transfer request to the endpoint FIFO.
 * If the transfer request completes, 1 is returned, otherwise 0 is returned.
 */
static int s3c_hsudc_write_fifo(struct s3c_hsudc_ep *hsep,
				struct s3c_hsudc_req *hsreq)
{
	u16 *buf;
	u32 max = ep_maxpacket(hsep);
	u32 count, length;
	bool is_last;
	void __iomem *fifo = hsep->fifo;

	buf = hsreq->req.buf + hsreq->req.actual;
	prefetch(buf);

	length = hsreq->req.length - hsreq->req.actual;
	length = min(length, max);
	hsreq->req.actual += length;

	writel(length, hsep->dev->regs + S3C_BWCR);
	for (count = 0; count < length; count += 2)
		writel(*buf++, fifo);

	if (count != max) {
		is_last = true;
	} else {
		if (hsreq->req.length != hsreq->req.actual || hsreq->req.zero)
			is_last = false;
		else
			is_last = true;
	}

	if (is_last) {
		s3c_hsudc_complete_request(hsep, hsreq, 0);
		return 1;
	}

	return 0;
}

/**
 * s3c_hsudc_read_fifo - Read the next chunk of data from EP fifo.
 * @hsep: Endpoint from which the data is to be read.
 * @hsreq: Transfer request to which the next chunk of data read is written.
 *
 * Read the next chunk of data from the endpoint FIFO and a write it to the
 * transfer request buffer. If the transfer request completes, 1 is returned,
 * otherwise 0 is returned.
 */
static int s3c_hsudc_read_fifo(struct s3c_hsudc_ep *hsep,
				struct s3c_hsudc_req *hsreq)
{
	struct s3c_hsudc *hsudc = hsep->dev;
	u32 csr, offset;
	u16 *buf, word;
	u32 buflen, rcnt, rlen;
	void __iomem *fifo = hsep->fifo;
	u32 is_short = 0;

	offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR;
	csr = readl(hsudc->regs + offset);
	if (!(csr & S3C_ESR_RX_SUCCESS))
		return -EINVAL;

	buf = hsreq->req.buf + hsreq->req.actual;
	prefetchw(buf);
	buflen = hsreq->req.length - hsreq->req.actual;

	rcnt = readl(hsudc->regs + S3C_BRCR);
	rlen = (csr & S3C_ESR_LWO) ? (rcnt * 2 - 1) : (rcnt * 2);

	hsreq->req.actual += min(rlen, buflen);
	is_short = (rlen < hsep->ep.maxpacket);

	while (rcnt-- != 0) {
		word = (u16)readl(fifo);
		if (buflen) {
			*buf++ = word;
			buflen--;
		} else {
			hsreq->req.status = -EOVERFLOW;
		}
	}

	writel(S3C_ESR_RX_SUCCESS, hsudc->regs + offset);

	if (is_short || hsreq->req.actual == hsreq->req.length) {
		s3c_hsudc_complete_request(hsep, hsreq, 0);
		return 1;
	}

	return 0;
}

/**
 * s3c_hsudc_epin_intr - Handle in-endpoint interrupt.
 * @hsudc - Device controller for which the interrupt is to be handled.
 * @ep_idx - Endpoint number on which an interrupt is pending.
 *
 * Handles interrupt for a in-endpoint. The interrupts that are handled are
 * stall and data transmit complete interrupt.
 */
static void s3c_hsudc_epin_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
{
	struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx];
	struct s3c_hsudc_req *hsreq;
	u32 csr;

	csr = readl(hsudc->regs + S3C_ESR);
	if (csr & S3C_ESR_STALL) {
		writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
		return;
	}

	if (csr & S3C_ESR_TX_SUCCESS) {
		writel(S3C_ESR_TX_SUCCESS, hsudc->regs + S3C_ESR);
		if (list_empty(&hsep->queue))
			return;

		hsreq = list_entry(hsep->queue.next,
				struct s3c_hsudc_req, queue);
		if ((s3c_hsudc_write_fifo(hsep, hsreq) == 0) &&
				(csr & S3C_ESR_PSIF_TWO))
			s3c_hsudc_write_fifo(hsep, hsreq);
	}
}

/**
 * s3c_hsudc_epout_intr - Handle out-endpoint interrupt.
 * @hsudc - Device controller for which the interrupt is to be handled.
 * @ep_idx - Endpoint number on which an interrupt is pending.
 *
 * Handles interrupt for a out-endpoint. The interrupts that are handled are
 * stall, flush and data ready interrupt.
 */
static void s3c_hsudc_epout_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
{
	struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx];
	struct s3c_hsudc_req *hsreq;
	u32 csr;

	csr = readl(hsudc->regs + S3C_ESR);
	if (csr & S3C_ESR_STALL) {
		writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
		return;
	}

	if (csr & S3C_ESR_FLUSH) {
		__orr32(hsudc->regs + S3C_ECR, S3C_ECR_FLUSH);
		return;
	}

	if (csr & S3C_ESR_RX_SUCCESS) {
		if (list_empty(&hsep->queue))
			return;

		hsreq = list_entry(hsep->queue.next,
				struct s3c_hsudc_req, queue);
		if (((s3c_hsudc_read_fifo(hsep, hsreq)) == 0) &&
				(csr & S3C_ESR_PSIF_TWO))
			s3c_hsudc_read_fifo(hsep, hsreq);
	}
}

/** s3c_hsudc_set_halt - Set or clear a endpoint halt.
 * @_ep: Endpoint on which halt has to be set or cleared.
 * @value: 1 for setting halt on endpoint, 0 to clear halt.
 *
 * Set or clear endpoint halt. If halt is set, the endpoint is stopped.
 * If halt is cleared, for in-endpoints, if there are any pending
 * transfer requests, transfers are started.
 */
static int s3c_hsudc_set_halt(struct usb_ep *_ep, int value)
{
	struct s3c_hsudc_ep *hsep = our_ep(_ep);
	struct s3c_hsudc *hsudc = hsep->dev;
	struct s3c_hsudc_req *hsreq;
	unsigned long irqflags;
	u32 ecr;
	u32 offset;

	if (value && ep_is_in(hsep) && !list_empty(&hsep->queue))
		return -EAGAIN;

	spin_lock_irqsave(&hsudc->lock, irqflags);
	set_index(hsudc, ep_index(hsep));
	offset = (ep_index(hsep)) ? S3C_ECR : S3C_EP0CR;
	ecr = readl(hsudc->regs + offset);

	if (value) {
		ecr |= S3C_ECR_STALL;
		if (ep_index(hsep))
			ecr |= S3C_ECR_FLUSH;
		hsep->stopped = 1;
	} else {
		ecr &= ~S3C_ECR_STALL;
		hsep->stopped = hsep->wedge = 0;
	}
	writel(ecr, hsudc->regs + offset);

	if (ep_is_in(hsep) && !list_empty(&hsep->queue) && !value) {
		hsreq = list_entry(hsep->queue.next,
			struct s3c_hsudc_req, queue);
		if (hsreq)
			s3c_hsudc_write_fifo(hsep, hsreq);
	}

	spin_unlock_irqrestore(&hsudc->lock, irqflags);
	return 0;
}

/** s3c_hsudc_set_wedge - Sets the halt feature with the clear requests ignored
 * @_ep: Endpoint on which wedge has to be set.
 *
 * Sets the halt feature with the clear requests ignored.
 */
static int s3c_hsudc_set_wedge(struct usb_ep *_ep)
{
	struct s3c_hsudc_ep *hsep = our_ep(_ep);

	if (!hsep)
		return -EINVAL;

	hsep->wedge = 1;
	return usb_ep_set_halt(_ep);
}

/** s3c_hsudc_handle_reqfeat - Handle set feature or clear feature requests.
 * @_ep: Device controller on which the set/clear feature needs to be handled.
 * @ctrl: Control request as received on the endpoint 0.
 *
 * Handle set feature or clear feature control requests on the control endpoint.
 */
static int s3c_hsudc_handle_reqfeat(struct s3c_hsudc *hsudc,
					struct usb_ctrlrequest *ctrl)
{
	struct s3c_hsudc_ep *hsep;
	bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
	u8 ep_num = ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK;

	if (ctrl->bRequestType == USB_RECIP_ENDPOINT) {
		hsep = &hsudc->ep[ep_num];
		switch (le16_to_cpu(ctrl->wValue)) {
		case USB_ENDPOINT_HALT:
			if (set || (!set && !hsep->wedge))
				s3c_hsudc_set_halt(&hsep->ep, set);
			return 0;
		}
	}

	return -ENOENT;
}

/**
 * s3c_hsudc_process_req_status - Handle get status control request.
 * @hsudc: Device controller on which get status request has be handled.
 * @ctrl: Control request as received on the endpoint 0.
 *
 * Handle get status control request received on control endpoint.
 */
static void s3c_hsudc_process_req_status(struct s3c_hsudc *hsudc,
					struct usb_ctrlrequest *ctrl)
{
	struct s3c_hsudc_ep *hsep0 = &hsudc->ep[0];
	struct s3c_hsudc_req hsreq;
	struct s3c_hsudc_ep *hsep;
	__le16 reply;
	u8 epnum;

	switch (ctrl->bRequestType & USB_RECIP_MASK) {
	case USB_RECIP_DEVICE:
		reply = cpu_to_le16(0);
		break;

	case USB_RECIP_INTERFACE:
		reply = cpu_to_le16(0);
		break;

	case USB_RECIP_ENDPOINT:
		epnum = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
		hsep = &hsudc->ep[epnum];
		reply = cpu_to_le16(hsep->stopped ? 1 : 0);
		break;
	}

	INIT_LIST_HEAD(&hsreq.queue);
	hsreq.req.length = 2;
	hsreq.req.buf = &reply;
	hsreq.req.actual = 0;
	hsreq.req.complete = NULL;
	s3c_hsudc_write_fifo(hsep0, &hsreq);
}

/**
 * s3c_hsudc_process_setup - Process control request received on endpoint 0.
 * @hsudc: Device controller on which control request has been received.
 *
 * Read the control request received on endpoint 0, decode it and handle
 * the request.
 */
static void s3c_hsudc_process_setup(struct s3c_hsudc *hsudc)
{
	struct s3c_hsudc_ep *hsep = &hsudc->ep[0];
	struct usb_ctrlrequest ctrl = {0};
	int ret;

	s3c_hsudc_nuke_ep(hsep, -EPROTO);
	s3c_hsudc_read_setup_pkt(hsudc, (u16 *)&ctrl);

	if (ctrl.bRequestType & USB_DIR_IN) {
		hsep->bEndpointAddress |= USB_DIR_IN;
		hsudc->ep0state = DATA_STATE_XMIT;
	} else {
		hsep->bEndpointAddress &= ~USB_DIR_IN;
		hsudc->ep0state = DATA_STATE_RECV;
	}

	switch (ctrl.bRequest) {
	case USB_REQ_SET_ADDRESS:
		if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE))
			break;
		hsudc->ep0state = WAIT_FOR_SETUP;
		return;

	case USB_REQ_GET_STATUS:
		if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
			break;
		s3c_hsudc_process_req_status(hsudc, &ctrl);
		return;

	case USB_REQ_SET_FEATURE:
	case USB_REQ_CLEAR_FEATURE:
		if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
			break;
		s3c_hsudc_handle_reqfeat(hsudc, &ctrl);
		hsudc->ep0state = WAIT_FOR_SETUP;
		return;
	}

	if (hsudc->driver) {
		spin_unlock(&hsudc->lock);
		ret = hsudc->driver->setup(&hsudc->gadget, &ctrl);
		spin_lock(&hsudc->lock);

		if (ctrl.bRequest == USB_REQ_SET_CONFIGURATION) {
			hsep->bEndpointAddress &= ~USB_DIR_IN;
			hsudc->ep0state = WAIT_FOR_SETUP;
		}

		if (ret < 0) {
			dev_err(hsudc->dev, "setup failed, returned %d\n",
						ret);
			s3c_hsudc_set_halt(&hsep->ep, 1);
			hsudc->ep0state = WAIT_FOR_SETUP;
			hsep->bEndpointAddress &= ~USB_DIR_IN;
		}
	}
}

/** s3c_hsudc_handle_ep0_intr - Handle endpoint 0 interrupt.
 * @hsudc: Device controller on which endpoint 0 interrupt has occured.
 *
 * Handle endpoint 0 interrupt when it occurs. EP0 interrupt could occur
 * when a stall handshake is sent to host or data is sent/received on
 * endpoint 0.
 */
static void s3c_hsudc_handle_ep0_intr(struct s3c_hsudc *hsudc)
{
	struct s3c_hsudc_ep *hsep = &hsudc->ep[0];
	struct s3c_hsudc_req *hsreq;
	u32 csr = readl(hsudc->regs + S3C_EP0SR);
	u32 ecr;

	if (csr & S3C_EP0SR_STALL) {
		ecr = readl(hsudc->regs + S3C_EP0CR);
		ecr &= ~(S3C_ECR_STALL | S3C_ECR_FLUSH);
		writel(ecr, hsudc->regs + S3C_EP0CR);

		writel(S3C_EP0SR_STALL, hsudc->regs + S3C_EP0SR);
		hsep->stopped = 0;

		s3c_hsudc_nuke_ep(hsep, -ECONNABORTED);
		hsudc->ep0state = WAIT_FOR_SETUP;
		hsep->bEndpointAddress &= ~USB_DIR_IN;
		return;
	}

	if (csr & S3C_EP0SR_TX_SUCCESS) {
		writel(S3C_EP0SR_TX_SUCCESS, hsudc->regs + S3C_EP0SR);
		if (ep_is_in(hsep)) {
			if (list_empty(&hsep->queue))
				return;

			hsreq = list_entry(hsep->queue.next,
					struct s3c_hsudc_req, queue);
			s3c_hsudc_write_fifo(hsep, hsreq);
		}
	}

	if (csr & S3C_EP0SR_RX_SUCCESS) {
		if (hsudc->ep0state == WAIT_FOR_SETUP)
			s3c_hsudc_process_setup(hsudc);
		else {
			if (!ep_is_in(hsep)) {
				if (list_empty(&hsep->queue))
					return;
				hsreq = list_entry(hsep->queue.next,
					struct s3c_hsudc_req, queue);
				s3c_hsudc_read_fifo(hsep, hsreq);
			}
		}
	}
}

/**
 * s3c_hsudc_ep_enable - Enable a endpoint.
 * @_ep: The endpoint to be enabled.
 * @desc: Endpoint descriptor.
 *
 * Enables a endpoint when called from the gadget driver. Endpoint stall if
 * any is cleared, transfer type is configured and endpoint interrupt is
 * enabled.
 */
static int s3c_hsudc_ep_enable(struct usb_ep *_ep,
				const struct usb_endpoint_descriptor *desc)
{
	struct s3c_hsudc_ep *hsep;
	struct s3c_hsudc *hsudc;
	unsigned long flags;
	u32 ecr = 0;

	hsep = our_ep(_ep);
	if (!_ep || !desc || _ep->name == ep0name
		|| desc->bDescriptorType != USB_DT_ENDPOINT
		|| hsep->bEndpointAddress != desc->bEndpointAddress
		|| ep_maxpacket(hsep) < usb_endpoint_maxp(desc))
		return -EINVAL;

	if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
		&& usb_endpoint_maxp(desc) != ep_maxpacket(hsep))
		|| !desc->wMaxPacketSize)
		return -ERANGE;

	hsudc = hsep->dev;
	if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN)
		return -ESHUTDOWN;

	spin_lock_irqsave(&hsudc->lock, flags);

	set_index(hsudc, hsep->bEndpointAddress);
	ecr |= ((usb_endpoint_xfer_int(desc)) ? S3C_ECR_IEMS : S3C_ECR_DUEN);
	writel(ecr, hsudc->regs + S3C_ECR);

	hsep->stopped = hsep->wedge = 0;
	hsep->ep.desc = desc;
	hsep->ep.maxpacket = usb_endpoint_maxp(desc);

	s3c_hsudc_set_halt(_ep, 0);
	__set_bit(ep_index(hsep), hsudc->regs + S3C_EIER);

	spin_unlock_irqrestore(&hsudc->lock, flags);
	return 0;
}

/**
 * s3c_hsudc_ep_disable - Disable a endpoint.
 * @_ep: The endpoint to be disabled.
 * @desc: Endpoint descriptor.
 *
 * Disables a endpoint when called from the gadget driver.
 */
static int s3c_hsudc_ep_disable(struct usb_ep *_ep)
{
	struct s3c_hsudc_ep *hsep = our_ep(_ep);
	struct s3c_hsudc *hsudc = hsep->dev;
	unsigned long flags;

	if (!_ep || !hsep->ep.desc)
		return -EINVAL;

	spin_lock_irqsave(&hsudc->lock, flags);

	set_index(hsudc, hsep->bEndpointAddress);
	__clear_bit(ep_index(hsep), hsudc->regs + S3C_EIER);

	s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN);

	hsep->ep.desc = NULL;
	hsep->stopped = 1;

	spin_unlock_irqrestore(&hsudc->lock, flags);
	return 0;
}

/**
 * s3c_hsudc_alloc_request - Allocate a new request.
 * @_ep: Endpoint for which request is allocated (not used).
 * @gfp_flags: Flags used for the allocation.
 *
 * Allocates a single transfer request structure when called from gadget driver.
 */
static struct usb_request *s3c_hsudc_alloc_request(struct usb_ep *_ep,
						gfp_t gfp_flags)
{
	struct s3c_hsudc_req *hsreq;

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

	INIT_LIST_HEAD(&hsreq->queue);
	return &hsreq->req;
}

/**
 * s3c_hsudc_free_request - Deallocate a request.
 * @ep: Endpoint for which request is deallocated (not used).
 * @_req: Request to be deallocated.
 *
 * Allocates a single transfer request structure when called from gadget driver.
 */
static void s3c_hsudc_free_request(struct usb_ep *ep, struct usb_request *_req)
{
	struct s3c_hsudc_req *hsreq;

	hsreq = our_req(_req);
	WARN_ON(!list_empty(&hsreq->queue));
	kfree(hsreq);
}

/**
 * s3c_hsudc_queue - Queue a transfer request for the endpoint.
 * @_ep: Endpoint for which the request is queued.
 * @_req: Request to be queued.
 * @gfp_flags: Not used.
 *
 * Start or enqueue a request for a endpoint when called from gadget driver.
 */
static int s3c_hsudc_queue(struct usb_ep *_ep, struct usb_request *_req,
			gfp_t gfp_flags)
{
	struct s3c_hsudc_req *hsreq;
	struct s3c_hsudc_ep *hsep;
	struct s3c_hsudc *hsudc;
	unsigned long flags;
	u32 offset;
	u32 csr;

	hsreq = our_req(_req);
	if ((!_req || !_req->complete || !_req->buf ||
		!list_empty(&hsreq->queue)))
		return -EINVAL;

	hsep = our_ep(_ep);
	hsudc = hsep->dev;
	if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN)
		return -ESHUTDOWN;

	spin_lock_irqsave(&hsudc->lock, flags);
	set_index(hsudc, hsep->bEndpointAddress);

	_req->status = -EINPROGRESS;
	_req->actual = 0;

	if (!ep_index(hsep) && _req->length == 0) {
		hsudc->ep0state = WAIT_FOR_SETUP;
		s3c_hsudc_complete_request(hsep, hsreq, 0);
		spin_unlock_irqrestore(&hsudc->lock, flags);
		return 0;
	}

	if (list_empty(&hsep->queue) && !hsep->stopped) {
		offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR;
		if (ep_is_in(hsep)) {
			csr = readl(hsudc->regs + offset);
			if (!(csr & S3C_ESR_TX_SUCCESS) &&
				(s3c_hsudc_write_fifo(hsep, hsreq) == 1))
				hsreq = NULL;
		} else {
			csr = readl(hsudc->regs + offset);
			if ((csr & S3C_ESR_RX_SUCCESS)
				   && (s3c_hsudc_read_fifo(hsep, hsreq) == 1))
				hsreq = NULL;
		}
	}

	if (hsreq)
		list_add_tail(&hsreq->queue, &hsep->queue);

	spin_unlock_irqrestore(&hsudc->lock, flags);
	return 0;
}

/**
 * s3c_hsudc_dequeue - Dequeue a transfer request from an endpoint.
 * @_ep: Endpoint from which the request is dequeued.
 * @_req: Request to be dequeued.
 *
 * Dequeue a request from a endpoint when called from gadget driver.
 */
static int s3c_hsudc_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
	struct s3c_hsudc_ep *hsep = our_ep(_ep);
	struct s3c_hsudc *hsudc = hsep->dev;
	struct s3c_hsudc_req *hsreq;
	unsigned long flags;

	hsep = our_ep(_ep);
	if (!_ep || hsep->ep.name == ep0name)
		return -EINVAL;

	spin_lock_irqsave(&hsudc->lock, flags);

	list_for_each_entry(hsreq, &hsep->queue, queue) {
		if (&hsreq->req == _req)
			break;
	}
	if (&hsreq->req != _req) {
		spin_unlock_irqrestore(&hsudc->lock, flags);
		return -EINVAL;
	}

	set_index(hsudc, hsep->bEndpointAddress);
	s3c_hsudc_complete_request(hsep, hsreq, -ECONNRESET);

	spin_unlock_irqrestore(&hsudc->lock, flags);
	return 0;
}

static struct usb_ep_ops s3c_hsudc_ep_ops = {
	.enable = s3c_hsudc_ep_enable,
	.disable = s3c_hsudc_ep_disable,
	.alloc_request = s3c_hsudc_alloc_request,
	.free_request = s3c_hsudc_free_request,
	.queue = s3c_hsudc_queue,
	.dequeue = s3c_hsudc_dequeue,
	.set_halt = s3c_hsudc_set_halt,
	.set_wedge = s3c_hsudc_set_wedge,
};

/**
 * s3c_hsudc_initep - Initialize a endpoint to default state.
 * @hsudc - Reference to the device controller.
 * @hsep - Endpoint to be initialized.
 * @epnum - Address to be assigned to the endpoint.
 *
 * Initialize a endpoint with default configuration.
 */
static void s3c_hsudc_initep(struct s3c_hsudc *hsudc,
				struct s3c_hsudc_ep *hsep, int epnum)
{
	char *dir;

	if ((epnum % 2) == 0) {
		dir = "out";
	} else {
		dir = "in";
		hsep->bEndpointAddress = USB_DIR_IN;
	}

	hsep->bEndpointAddress |= epnum;
	if (epnum)
		snprintf(hsep->name, sizeof(hsep->name), "ep%d%s", epnum, dir);
	else
		snprintf(hsep->name, sizeof(hsep->name), "%s", ep0name);

	INIT_LIST_HEAD(&hsep->queue);
	INIT_LIST_HEAD(&hsep->ep.ep_list);
	if (epnum)
		list_add_tail(&hsep->ep.ep_list, &hsudc->gadget.ep_list);

	hsep->dev = hsudc;
	hsep->ep.name = hsep->name;
	hsep->ep.maxpacket = epnum ? 512 : 64;
	hsep->ep.ops = &s3c_hsudc_ep_ops;
	hsep->fifo = hsudc->regs + S3C_BR(epnum);
	hsep->ep.desc = NULL;
	hsep->stopped = 0;
	hsep->wedge = 0;

	set_index(hsudc, epnum);
	writel(hsep->ep.maxpacket, hsudc->regs + S3C_MPR);
}

/**
 * s3c_hsudc_setup_ep - Configure all endpoints to default state.
 * @hsudc: Reference to device controller.
 *
 * Configures all endpoints to default state.
 */
static void s3c_hsudc_setup_ep(struct s3c_hsudc *hsudc)
{
	int epnum;

	hsudc->ep0state = WAIT_FOR_SETUP;
	INIT_LIST_HEAD(&hsudc->gadget.ep_list);
	for (epnum = 0; epnum < hsudc->pd->epnum; epnum++)
		s3c_hsudc_initep(hsudc, &hsudc->ep[epnum], epnum);
}

/**
 * s3c_hsudc_reconfig - Reconfigure the device controller to default state.
 * @hsudc: Reference to device controller.
 *
 * Reconfigures the device controller registers to a default state.
 */
static void s3c_hsudc_reconfig(struct s3c_hsudc *hsudc)
{
	writel(0xAA, hsudc->regs + S3C_EDR);
	writel(1, hsudc->regs + S3C_EIER);
	writel(0, hsudc->regs + S3C_TR);
	writel(S3C_SCR_DTZIEN_EN | S3C_SCR_RRD_EN | S3C_SCR_SUS_EN |
			S3C_SCR_RST_EN, hsudc->regs + S3C_SCR);
	writel(0, hsudc->regs + S3C_EP0CR);

	s3c_hsudc_setup_ep(hsudc);
}

/**
 * s3c_hsudc_irq - Interrupt handler for device controller.
 * @irq: Not used.
 * @_dev: Reference to the device controller.
 *
 * Interrupt handler for the device controller. This handler handles controller
 * interrupts and endpoint interrupts.
 */
static irqreturn_t s3c_hsudc_irq(int irq, void *_dev)
{
	struct s3c_hsudc *hsudc = _dev;
	struct s3c_hsudc_ep *hsep;
	u32 ep_intr;
	u32 sys_status;
	u32 ep_idx;

	spin_lock(&hsudc->lock);

	sys_status = readl(hsudc->regs + S3C_SSR);
	ep_intr = readl(hsudc->regs + S3C_EIR) & 0x3FF;

	if (!ep_intr && !(sys_status & S3C_SSR_DTZIEN_EN)) {
		spin_unlock(&hsudc->lock);
		return IRQ_HANDLED;
	}

	if (sys_status) {
		if (sys_status & S3C_SSR_VBUSON)
			writel(S3C_SSR_VBUSON, hsudc->regs + S3C_SSR);

		if (sys_status & S3C_SSR_ERR)
			writel(S3C_SSR_ERR, hsudc->regs + S3C_SSR);

		if (sys_status & S3C_SSR_SDE) {
			writel(S3C_SSR_SDE, hsudc->regs + S3C_SSR);
			hsudc->gadget.speed = (sys_status & S3C_SSR_HSP) ?
				USB_SPEED_HIGH : USB_SPEED_FULL;
		}

		if (sys_status & S3C_SSR_SUSPEND) {
			writel(S3C_SSR_SUSPEND, hsudc->regs + S3C_SSR);
			if (hsudc->gadget.speed != USB_SPEED_UNKNOWN
				&& hsudc->driver && hsudc->driver->suspend)
				hsudc->driver->suspend(&hsudc->gadget);
		}

		if (sys_status & S3C_SSR_RESUME) {
			writel(S3C_SSR_RESUME, hsudc->regs + S3C_SSR);
			if (hsudc->gadget.speed != USB_SPEED_UNKNOWN
				&& hsudc->driver && hsudc->driver->resume)
				hsudc->driver->resume(&hsudc->gadget);
		}

		if (sys_status & S3C_SSR_RESET) {
			writel(S3C_SSR_RESET, hsudc->regs + S3C_SSR);
			for (ep_idx = 0; ep_idx < hsudc->pd->epnum; ep_idx++) {
				hsep = &hsudc->ep[ep_idx];
				hsep->stopped = 1;
				s3c_hsudc_nuke_ep(hsep, -ECONNRESET);
			}
			s3c_hsudc_reconfig(hsudc);
			hsudc->ep0state = WAIT_FOR_SETUP;
		}
	}

	if (ep_intr & S3C_EIR_EP0) {
		writel(S3C_EIR_EP0, hsudc->regs + S3C_EIR);
		set_index(hsudc, 0);
		s3c_hsudc_handle_ep0_intr(hsudc);
	}

	ep_intr >>= 1;
	ep_idx = 1;
	while (ep_intr) {
		if (ep_intr & 1)  {
			hsep = &hsudc->ep[ep_idx];
			set_index(hsudc, ep_idx);
			writel(1 << ep_idx, hsudc->regs + S3C_EIR);
			if (ep_is_in(hsep))
				s3c_hsudc_epin_intr(hsudc, ep_idx);
			else
				s3c_hsudc_epout_intr(hsudc, ep_idx);
		}
		ep_intr >>= 1;
		ep_idx++;
	}

	spin_unlock(&hsudc->lock);
	return IRQ_HANDLED;
}

static int s3c_hsudc_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	struct s3c_hsudc *hsudc = to_hsudc(gadget);
	int ret;

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

	if (!hsudc)
		return -ENODEV;

	if (hsudc->driver)
		return -EBUSY;

	hsudc->driver = driver;

	ret = regulator_bulk_enable(ARRAY_SIZE(hsudc->supplies),
				    hsudc->supplies);
	if (ret != 0) {
		dev_err(hsudc->dev, "failed to enable supplies: %d\n", ret);
		goto err_supplies;
	}

	/* connect to bus through transceiver */
	if (!IS_ERR_OR_NULL(hsudc->transceiver)) {
		ret = otg_set_peripheral(hsudc->transceiver->otg,
					&hsudc->gadget);
		if (ret) {
			dev_err(hsudc->dev, "%s: can't bind to transceiver\n",
					hsudc->gadget.name);
			goto err_otg;
		}
	}

	enable_irq(hsudc->irq);
	dev_info(hsudc->dev, "bound driver %s\n", driver->driver.name);

	s3c_hsudc_reconfig(hsudc);

	pm_runtime_get_sync(hsudc->dev);

	s3c_hsudc_init_phy();
	if (hsudc->pd->gpio_init)
		hsudc->pd->gpio_init();

	return 0;
err_otg:
	regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);
err_supplies:
	hsudc->driver = NULL;
	return ret;
}

static int s3c_hsudc_stop(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	struct s3c_hsudc *hsudc = to_hsudc(gadget);
	unsigned long flags;

	if (!hsudc)
		return -ENODEV;

	if (!driver || driver != hsudc->driver)
		return -EINVAL;

	spin_lock_irqsave(&hsudc->lock, flags);
	hsudc->driver = NULL;
	hsudc->gadget.speed = USB_SPEED_UNKNOWN;
	s3c_hsudc_uninit_phy();

	pm_runtime_put(hsudc->dev);

	if (hsudc->pd->gpio_uninit)
		hsudc->pd->gpio_uninit();
	s3c_hsudc_stop_activity(hsudc);
	spin_unlock_irqrestore(&hsudc->lock, flags);

	if (!IS_ERR_OR_NULL(hsudc->transceiver))
		(void) otg_set_peripheral(hsudc->transceiver->otg, NULL);

	disable_irq(hsudc->irq);

	regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);

	dev_info(hsudc->dev, "unregistered gadget driver '%s'\n",
			driver->driver.name);
	return 0;
}

static inline u32 s3c_hsudc_read_frameno(struct s3c_hsudc *hsudc)
{
	return readl(hsudc->regs + S3C_FNR) & 0x3FF;
}

static int s3c_hsudc_gadget_getframe(struct usb_gadget *gadget)
{
	return s3c_hsudc_read_frameno(to_hsudc(gadget));
}

static int s3c_hsudc_vbus_draw(struct usb_gadget *gadget, unsigned mA)
{
	struct s3c_hsudc *hsudc = to_hsudc(gadget);

	if (!hsudc)
		return -ENODEV;

	if (!IS_ERR_OR_NULL(hsudc->transceiver))
		return usb_phy_set_power(hsudc->transceiver, mA);

	return -EOPNOTSUPP;
}

static const struct usb_gadget_ops s3c_hsudc_gadget_ops = {
	.get_frame	= s3c_hsudc_gadget_getframe,
	.udc_start	= s3c_hsudc_start,
	.udc_stop	= s3c_hsudc_stop,
	.vbus_draw	= s3c_hsudc_vbus_draw,
};

static int s3c_hsudc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct s3c_hsudc *hsudc;
	struct s3c24xx_hsudc_platdata *pd = dev_get_platdata(&pdev->dev);
	int ret, i;

	hsudc = devm_kzalloc(&pdev->dev, sizeof(struct s3c_hsudc) +
			sizeof(struct s3c_hsudc_ep) * pd->epnum,
			GFP_KERNEL);
	if (!hsudc) {
		dev_err(dev, "cannot allocate memory\n");
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, dev);
	hsudc->dev = dev;
	hsudc->pd = dev_get_platdata(&pdev->dev);

	hsudc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);

	for (i = 0; i < ARRAY_SIZE(hsudc->supplies); i++)
		hsudc->supplies[i].supply = s3c_hsudc_supply_names[i];

	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(hsudc->supplies),
				 hsudc->supplies);
	if (ret != 0) {
		dev_err(dev, "failed to request supplies: %d\n", ret);
		goto err_supplies;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	hsudc->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(hsudc->regs)) {
		ret = PTR_ERR(hsudc->regs);
		goto err_res;
	}

	spin_lock_init(&hsudc->lock);

	hsudc->gadget.max_speed = USB_SPEED_HIGH;
	hsudc->gadget.ops = &s3c_hsudc_gadget_ops;
	hsudc->gadget.name = dev_name(dev);
	hsudc->gadget.ep0 = &hsudc->ep[0].ep;
	hsudc->gadget.is_otg = 0;
	hsudc->gadget.is_a_peripheral = 0;
	hsudc->gadget.speed = USB_SPEED_UNKNOWN;

	s3c_hsudc_setup_ep(hsudc);

	ret = platform_get_irq(pdev, 0);
	if (ret < 0) {
		dev_err(dev, "unable to obtain IRQ number\n");
		goto err_res;
	}
	hsudc->irq = ret;

	ret = devm_request_irq(&pdev->dev, hsudc->irq, s3c_hsudc_irq, 0,
				driver_name, hsudc);
	if (ret < 0) {
		dev_err(dev, "irq request failed\n");
		goto err_res;
	}

	hsudc->uclk = devm_clk_get(&pdev->dev, "usb-device");
	if (IS_ERR(hsudc->uclk)) {
		dev_err(dev, "failed to find usb-device clock source\n");
		ret = PTR_ERR(hsudc->uclk);
		goto err_res;
	}
	clk_enable(hsudc->uclk);

	local_irq_disable();

	disable_irq(hsudc->irq);
	local_irq_enable();

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

	pm_runtime_enable(dev);

	return 0;
err_add_udc:
err_add_device:
	clk_disable(hsudc->uclk);
err_res:
	if (!IS_ERR_OR_NULL(hsudc->transceiver))
		usb_put_phy(hsudc->transceiver);

err_supplies:
	return ret;
}

static struct platform_driver s3c_hsudc_driver = {
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "s3c-hsudc",
	},
	.probe		= s3c_hsudc_probe,
};

module_platform_driver(s3c_hsudc_driver);

MODULE_DESCRIPTION("Samsung S3C24XX USB high-speed controller driver");
MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c-hsudc");