summaryrefslogtreecommitdiffstats
path: root/drivers/usb/phy/phy-fsl-usb.c
blob: 94eb2923afed03d58578bd9ea89af50116206a35 (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
/*
 * Copyright (C) 2007,2008 Freescale semiconductor, Inc.
 *
 * Author: Li Yang <LeoLi@freescale.com>
 *         Jerry Huang <Chang-Ming.Huang@freescale.com>
 *
 * Initialization based on code from Shlomi Gridish.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 * 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.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/timer.h>
#include <linux/usb.h>
#include <linux/device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/workqueue.h>
#include <linux/time.h>
#include <linux/fsl_devices.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>

#include <asm/unaligned.h>

#include "phy-fsl-usb.h"

#define DRIVER_VERSION "Rev. 1.55"
#define DRIVER_AUTHOR "Jerry Huang/Li Yang"
#define DRIVER_DESC "Freescale USB OTG Transceiver Driver"
#define DRIVER_INFO DRIVER_DESC " " DRIVER_VERSION

static const char driver_name[] = "fsl-usb2-otg";

const pm_message_t otg_suspend_state = {
	.event = 1,
};

#define HA_DATA_PULSE

static struct usb_dr_mmap *usb_dr_regs;
static struct fsl_otg *fsl_otg_dev;
static int srp_wait_done;

/* FSM timers */
struct fsl_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr, *a_aidl_bdis_tmr,
	*b_ase0_brst_tmr, *b_se0_srp_tmr;

/* Driver specific timers */
struct fsl_otg_timer *b_data_pulse_tmr, *b_vbus_pulse_tmr, *b_srp_fail_tmr,
	*b_srp_wait_tmr, *a_wait_enum_tmr;

static struct list_head active_timers;

static struct fsl_otg_config fsl_otg_initdata = {
	.otg_port = 1,
};

#ifdef CONFIG_PPC32
static u32 _fsl_readl_be(const unsigned __iomem *p)
{
	return in_be32(p);
}

static u32 _fsl_readl_le(const unsigned __iomem *p)
{
	return in_le32(p);
}

static void _fsl_writel_be(u32 v, unsigned __iomem *p)
{
	out_be32(p, v);
}

static void _fsl_writel_le(u32 v, unsigned __iomem *p)
{
	out_le32(p, v);
}

static u32 (*_fsl_readl)(const unsigned __iomem *p);
static void (*_fsl_writel)(u32 v, unsigned __iomem *p);

#define fsl_readl(p)		(*_fsl_readl)((p))
#define fsl_writel(v, p)	(*_fsl_writel)((v), (p))

#else
#define fsl_readl(addr)		readl(addr)
#define fsl_writel(val, addr)	writel(val, addr)
#endif /* CONFIG_PPC32 */

int write_ulpi(u8 addr, u8 data)
{
	u32 temp;

	temp = 0x60000000 | (addr << 16) | data;
	fsl_writel(temp, &usb_dr_regs->ulpiview);
	return 0;
}

/* -------------------------------------------------------------*/
/* Operations that will be called from OTG Finite State Machine */

/* Charge vbus for vbus pulsing in SRP */
void fsl_otg_chrg_vbus(struct otg_fsm *fsm, int on)
{
	u32 tmp;

	tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;

	if (on)
		/* stop discharging, start charging */
		tmp = (tmp & ~OTGSC_CTRL_VBUS_DISCHARGE) |
			OTGSC_CTRL_VBUS_CHARGE;
	else
		/* stop charging */
		tmp &= ~OTGSC_CTRL_VBUS_CHARGE;

	fsl_writel(tmp, &usb_dr_regs->otgsc);
}

/* Discharge vbus through a resistor to ground */
void fsl_otg_dischrg_vbus(int on)
{
	u32 tmp;

	tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;

	if (on)
		/* stop charging, start discharging */
		tmp = (tmp & ~OTGSC_CTRL_VBUS_CHARGE) |
			OTGSC_CTRL_VBUS_DISCHARGE;
	else
		/* stop discharging */
		tmp &= ~OTGSC_CTRL_VBUS_DISCHARGE;

	fsl_writel(tmp, &usb_dr_regs->otgsc);
}

/* A-device driver vbus, controlled through PP bit in PORTSC */
void fsl_otg_drv_vbus(struct otg_fsm *fsm, int on)
{
	u32 tmp;

	if (on) {
		tmp = fsl_readl(&usb_dr_regs->portsc) & ~PORTSC_W1C_BITS;
		fsl_writel(tmp | PORTSC_PORT_POWER, &usb_dr_regs->portsc);
	} else {
		tmp = fsl_readl(&usb_dr_regs->portsc) &
		      ~PORTSC_W1C_BITS & ~PORTSC_PORT_POWER;
		fsl_writel(tmp, &usb_dr_regs->portsc);
	}
}

/*
 * Pull-up D+, signalling connect by periperal. Also used in
 * data-line pulsing in SRP
 */
void fsl_otg_loc_conn(struct otg_fsm *fsm, int on)
{
	u32 tmp;

	tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;

	if (on)
		tmp |= OTGSC_CTRL_DATA_PULSING;
	else
		tmp &= ~OTGSC_CTRL_DATA_PULSING;

	fsl_writel(tmp, &usb_dr_regs->otgsc);
}

/*
 * Generate SOF by host.  This is controlled through suspend/resume the
 * port.  In host mode, controller will automatically send SOF.
 * Suspend will block the data on the port.
 */
void fsl_otg_loc_sof(struct otg_fsm *fsm, int on)
{
	u32 tmp;

	tmp = fsl_readl(&fsl_otg_dev->dr_mem_map->portsc) & ~PORTSC_W1C_BITS;
	if (on)
		tmp |= PORTSC_PORT_FORCE_RESUME;
	else
		tmp |= PORTSC_PORT_SUSPEND;

	fsl_writel(tmp, &fsl_otg_dev->dr_mem_map->portsc);

}

/* Start SRP pulsing by data-line pulsing, followed with v-bus pulsing. */
void fsl_otg_start_pulse(struct otg_fsm *fsm)
{
	u32 tmp;

	srp_wait_done = 0;
#ifdef HA_DATA_PULSE
	tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
	tmp |= OTGSC_HA_DATA_PULSE;
	fsl_writel(tmp, &usb_dr_regs->otgsc);
#else
	fsl_otg_loc_conn(1);
#endif

	fsl_otg_add_timer(fsm, b_data_pulse_tmr);
}

void b_data_pulse_end(unsigned long foo)
{
#ifdef HA_DATA_PULSE
#else
	fsl_otg_loc_conn(0);
#endif

	/* Do VBUS pulse after data pulse */
	fsl_otg_pulse_vbus();
}

void fsl_otg_pulse_vbus(void)
{
	srp_wait_done = 0;
	fsl_otg_chrg_vbus(&fsl_otg_dev->fsm, 1);
	/* start the timer to end vbus charge */
	fsl_otg_add_timer(&fsl_otg_dev->fsm, b_vbus_pulse_tmr);
}

void b_vbus_pulse_end(unsigned long foo)
{
	fsl_otg_chrg_vbus(&fsl_otg_dev->fsm, 0);

	/*
	 * As USB3300 using the same a_sess_vld and b_sess_vld voltage
	 * we need to discharge the bus for a while to distinguish
	 * residual voltage of vbus pulsing and A device pull up
	 */
	fsl_otg_dischrg_vbus(1);
	fsl_otg_add_timer(&fsl_otg_dev->fsm, b_srp_wait_tmr);
}

void b_srp_end(unsigned long foo)
{
	fsl_otg_dischrg_vbus(0);
	srp_wait_done = 1;

	if ((fsl_otg_dev->phy.otg->state == OTG_STATE_B_SRP_INIT) &&
	    fsl_otg_dev->fsm.b_sess_vld)
		fsl_otg_dev->fsm.b_srp_done = 1;
}

/*
 * Workaround for a_host suspending too fast.  When a_bus_req=0,
 * a_host will start by SRP.  It needs to set b_hnp_enable before
 * actually suspending to start HNP
 */
void a_wait_enum(unsigned long foo)
{
	VDBG("a_wait_enum timeout\n");
	if (!fsl_otg_dev->phy.otg->host->b_hnp_enable)
		fsl_otg_add_timer(&fsl_otg_dev->fsm, a_wait_enum_tmr);
	else
		otg_statemachine(&fsl_otg_dev->fsm);
}

/* The timeout callback function to set time out bit */
void set_tmout(unsigned long indicator)
{
	*(int *)indicator = 1;
}

/* Initialize timers */
int fsl_otg_init_timers(struct otg_fsm *fsm)
{
	/* FSM used timers */
	a_wait_vrise_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_VRISE,
				(unsigned long)&fsm->a_wait_vrise_tmout);
	if (!a_wait_vrise_tmr)
		return -ENOMEM;

	a_wait_bcon_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_BCON,
				(unsigned long)&fsm->a_wait_bcon_tmout);
	if (!a_wait_bcon_tmr)
		return -ENOMEM;

	a_aidl_bdis_tmr = otg_timer_initializer(&set_tmout, TA_AIDL_BDIS,
				(unsigned long)&fsm->a_aidl_bdis_tmout);
	if (!a_aidl_bdis_tmr)
		return -ENOMEM;

	b_ase0_brst_tmr = otg_timer_initializer(&set_tmout, TB_ASE0_BRST,
				(unsigned long)&fsm->b_ase0_brst_tmout);
	if (!b_ase0_brst_tmr)
		return -ENOMEM;

	b_se0_srp_tmr = otg_timer_initializer(&set_tmout, TB_SE0_SRP,
				(unsigned long)&fsm->b_se0_srp);
	if (!b_se0_srp_tmr)
		return -ENOMEM;

	b_srp_fail_tmr = otg_timer_initializer(&set_tmout, TB_SRP_FAIL,
				(unsigned long)&fsm->b_srp_done);
	if (!b_srp_fail_tmr)
		return -ENOMEM;

	a_wait_enum_tmr = otg_timer_initializer(&a_wait_enum, 10,
				(unsigned long)&fsm);
	if (!a_wait_enum_tmr)
		return -ENOMEM;

	/* device driver used timers */
	b_srp_wait_tmr = otg_timer_initializer(&b_srp_end, TB_SRP_WAIT, 0);
	if (!b_srp_wait_tmr)
		return -ENOMEM;

	b_data_pulse_tmr = otg_timer_initializer(&b_data_pulse_end,
				TB_DATA_PLS, 0);
	if (!b_data_pulse_tmr)
		return -ENOMEM;

	b_vbus_pulse_tmr = otg_timer_initializer(&b_vbus_pulse_end,
				TB_VBUS_PLS, 0);
	if (!b_vbus_pulse_tmr)
		return -ENOMEM;

	return 0;
}

/* Uninitialize timers */
void fsl_otg_uninit_timers(void)
{
	/* FSM used timers */
	kfree(a_wait_vrise_tmr);
	kfree(a_wait_bcon_tmr);
	kfree(a_aidl_bdis_tmr);
	kfree(b_ase0_brst_tmr);
	kfree(b_se0_srp_tmr);
	kfree(b_srp_fail_tmr);
	kfree(a_wait_enum_tmr);

	/* device driver used timers */
	kfree(b_srp_wait_tmr);
	kfree(b_data_pulse_tmr);
	kfree(b_vbus_pulse_tmr);
}

static struct fsl_otg_timer *fsl_otg_get_timer(enum otg_fsm_timer t)
{
	struct fsl_otg_timer *timer;

	/* REVISIT: use array of pointers to timers instead */
	switch (t) {
	case A_WAIT_VRISE:
		timer = a_wait_vrise_tmr;
		break;
	case A_WAIT_BCON:
		timer = a_wait_vrise_tmr;
		break;
	case A_AIDL_BDIS:
		timer = a_wait_vrise_tmr;
		break;
	case B_ASE0_BRST:
		timer = a_wait_vrise_tmr;
		break;
	case B_SE0_SRP:
		timer = a_wait_vrise_tmr;
		break;
	case B_SRP_FAIL:
		timer = a_wait_vrise_tmr;
		break;
	case A_WAIT_ENUM:
		timer = a_wait_vrise_tmr;
		break;
	default:
		timer = NULL;
	}

	return timer;
}

/* Add timer to timer list */
void fsl_otg_add_timer(struct otg_fsm *fsm, void *gtimer)
{
	struct fsl_otg_timer *timer = gtimer;
	struct fsl_otg_timer *tmp_timer;

	/*
	 * Check if the timer is already in the active list,
	 * if so update timer count
	 */
	list_for_each_entry(tmp_timer, &active_timers, list)
	    if (tmp_timer == timer) {
		timer->count = timer->expires;
		return;
	}
	timer->count = timer->expires;
	list_add_tail(&timer->list, &active_timers);
}

static void fsl_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
{
	struct fsl_otg_timer *timer;

	timer = fsl_otg_get_timer(t);
	if (!timer)
		return;

	fsl_otg_add_timer(fsm, timer);
}

/* Remove timer from the timer list; clear timeout status */
void fsl_otg_del_timer(struct otg_fsm *fsm, void *gtimer)
{
	struct fsl_otg_timer *timer = gtimer;
	struct fsl_otg_timer *tmp_timer, *del_tmp;

	list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list)
		if (tmp_timer == timer)
			list_del(&timer->list);
}

static void fsl_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
{
	struct fsl_otg_timer *timer;

	timer = fsl_otg_get_timer(t);
	if (!timer)
		return;

	fsl_otg_del_timer(fsm, timer);
}

/* Reset controller, not reset the bus */
void otg_reset_controller(void)
{
	u32 command;

	command = fsl_readl(&usb_dr_regs->usbcmd);
	command |= (1 << 1);
	fsl_writel(command, &usb_dr_regs->usbcmd);
	while (fsl_readl(&usb_dr_regs->usbcmd) & (1 << 1))
		;
}

/* Call suspend/resume routines in host driver */
int fsl_otg_start_host(struct otg_fsm *fsm, int on)
{
	struct usb_otg *otg = fsm->otg;
	struct device *dev;
	struct fsl_otg *otg_dev =
		container_of(otg->usb_phy, struct fsl_otg, phy);
	u32 retval = 0;

	if (!otg->host)
		return -ENODEV;
	dev = otg->host->controller;

	/*
	 * Update a_vbus_vld state as a_vbus_vld int is disabled
	 * in device mode
	 */
	fsm->a_vbus_vld =
		!!(fsl_readl(&usb_dr_regs->otgsc) & OTGSC_STS_A_VBUS_VALID);
	if (on) {
		/* start fsl usb host controller */
		if (otg_dev->host_working)
			goto end;
		else {
			otg_reset_controller();
			VDBG("host on......\n");
			if (dev->driver->pm && dev->driver->pm->resume) {
				retval = dev->driver->pm->resume(dev);
				if (fsm->id) {
					/* default-b */
					fsl_otg_drv_vbus(fsm, 1);
					/*
					 * Workaround: b_host can't driver
					 * vbus, but PP in PORTSC needs to
					 * be 1 for host to work.
					 * So we set drv_vbus bit in
					 * transceiver to 0 thru ULPI.
					 */
					write_ulpi(0x0c, 0x20);
				}
			}

			otg_dev->host_working = 1;
		}
	} else {
		/* stop fsl usb host controller */
		if (!otg_dev->host_working)
			goto end;
		else {
			VDBG("host off......\n");
			if (dev && dev->driver) {
				if (dev->driver->pm && dev->driver->pm->suspend)
					retval = dev->driver->pm->suspend(dev);
				if (fsm->id)
					/* default-b */
					fsl_otg_drv_vbus(fsm, 0);
			}
			otg_dev->host_working = 0;
		}
	}
end:
	return retval;
}

/*
 * Call suspend and resume function in udc driver
 * to stop and start udc driver.
 */
int fsl_otg_start_gadget(struct otg_fsm *fsm, int on)
{
	struct usb_otg *otg = fsm->otg;
	struct device *dev;

	if (!otg->gadget || !otg->gadget->dev.parent)
		return -ENODEV;

	VDBG("gadget %s\n", on ? "on" : "off");
	dev = otg->gadget->dev.parent;

	if (on) {
		if (dev->driver->resume)
			dev->driver->resume(dev);
	} else {
		if (dev->driver->suspend)
			dev->driver->suspend(dev, otg_suspend_state);
	}

	return 0;
}

/*
 * Called by initialization code of host driver.  Register host controller
 * to the OTG.  Suspend host for OTG role detection.
 */
static int fsl_otg_set_host(struct usb_otg *otg, struct usb_bus *host)
{
	struct fsl_otg *otg_dev;

	if (!otg)
		return -ENODEV;

	otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
	if (otg_dev != fsl_otg_dev)
		return -ENODEV;

	otg->host = host;

	otg_dev->fsm.a_bus_drop = 0;
	otg_dev->fsm.a_bus_req = 1;

	if (host) {
		VDBG("host off......\n");

		otg->host->otg_port = fsl_otg_initdata.otg_port;
		otg->host->is_b_host = otg_dev->fsm.id;
		/*
		 * must leave time for hub_wq to finish its thing
		 * before yanking the host driver out from under it,
		 * so suspend the host after a short delay.
		 */
		otg_dev->host_working = 1;
		schedule_delayed_work(&otg_dev->otg_event, 100);
		return 0;
	} else {
		/* host driver going away */
		if (!(fsl_readl(&otg_dev->dr_mem_map->otgsc) &
		      OTGSC_STS_USB_ID)) {
			/* Mini-A cable connected */
			struct otg_fsm *fsm = &otg_dev->fsm;

			otg->state = OTG_STATE_UNDEFINED;
			fsm->protocol = PROTO_UNDEF;
		}
	}

	otg_dev->host_working = 0;

	otg_statemachine(&otg_dev->fsm);

	return 0;
}

/* Called by initialization code of udc.  Register udc to OTG. */
static int fsl_otg_set_peripheral(struct usb_otg *otg,
					struct usb_gadget *gadget)
{
	struct fsl_otg *otg_dev;

	if (!otg)
		return -ENODEV;

	otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
	VDBG("otg_dev 0x%x\n", (int)otg_dev);
	VDBG("fsl_otg_dev 0x%x\n", (int)fsl_otg_dev);
	if (otg_dev != fsl_otg_dev)
		return -ENODEV;

	if (!gadget) {
		if (!otg->default_a)
			otg->gadget->ops->vbus_draw(otg->gadget, 0);
		usb_gadget_vbus_disconnect(otg->gadget);
		otg->gadget = 0;
		otg_dev->fsm.b_bus_req = 0;
		otg_statemachine(&otg_dev->fsm);
		return 0;
	}

	otg->gadget = gadget;
	otg->gadget->is_a_peripheral = !otg_dev->fsm.id;

	otg_dev->fsm.b_bus_req = 1;

	/* start the gadget right away if the ID pin says Mini-B */
	pr_debug("ID pin=%d\n", otg_dev->fsm.id);
	if (otg_dev->fsm.id == 1) {
		fsl_otg_start_host(&otg_dev->fsm, 0);
		otg_drv_vbus(&otg_dev->fsm, 0);
		fsl_otg_start_gadget(&otg_dev->fsm, 1);
	}

	return 0;
}

/* Set OTG port power, only for B-device */
static int fsl_otg_set_power(struct usb_phy *phy, unsigned mA)
{
	if (!fsl_otg_dev)
		return -ENODEV;
	if (phy->otg->state == OTG_STATE_B_PERIPHERAL)
		pr_info("FSL OTG: Draw %d mA\n", mA);

	return 0;
}

/*
 * Delayed pin detect interrupt processing.
 *
 * When the Mini-A cable is disconnected from the board,
 * the pin-detect interrupt happens before the disconnect
 * interrupts for the connected device(s).  In order to
 * process the disconnect interrupt(s) prior to switching
 * roles, the pin-detect interrupts are delayed, and handled
 * by this routine.
 */
static void fsl_otg_event(struct work_struct *work)
{
	struct fsl_otg *og = container_of(work, struct fsl_otg, otg_event.work);
	struct otg_fsm *fsm = &og->fsm;

	if (fsm->id) {		/* switch to gadget */
		fsl_otg_start_host(fsm, 0);
		otg_drv_vbus(fsm, 0);
		fsl_otg_start_gadget(fsm, 1);
	}
}

/* B-device start SRP */
static int fsl_otg_start_srp(struct usb_otg *otg)
{
	struct fsl_otg *otg_dev;

	if (!otg || otg->state != OTG_STATE_B_IDLE)
		return -ENODEV;

	otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
	if (otg_dev != fsl_otg_dev)
		return -ENODEV;

	otg_dev->fsm.b_bus_req = 1;
	otg_statemachine(&otg_dev->fsm);

	return 0;
}

/* A_host suspend will call this function to start hnp */
static int fsl_otg_start_hnp(struct usb_otg *otg)
{
	struct fsl_otg *otg_dev;

	if (!otg)
		return -ENODEV;

	otg_dev = container_of(otg->usb_phy, struct fsl_otg, phy);
	if (otg_dev != fsl_otg_dev)
		return -ENODEV;

	pr_debug("start_hnp...\n");

	/* clear a_bus_req to enter a_suspend state */
	otg_dev->fsm.a_bus_req = 0;
	otg_statemachine(&otg_dev->fsm);

	return 0;
}

/*
 * Interrupt handler.  OTG/host/peripheral share the same int line.
 * OTG driver clears OTGSC interrupts and leaves USB interrupts
 * intact.  It needs to have knowledge of some USB interrupts
 * such as port change.
 */
irqreturn_t fsl_otg_isr(int irq, void *dev_id)
{
	struct otg_fsm *fsm = &((struct fsl_otg *)dev_id)->fsm;
	struct usb_otg *otg = ((struct fsl_otg *)dev_id)->phy.otg;
	u32 otg_int_src, otg_sc;

	otg_sc = fsl_readl(&usb_dr_regs->otgsc);
	otg_int_src = otg_sc & OTGSC_INTSTS_MASK & (otg_sc >> 8);

	/* Only clear otg interrupts */
	fsl_writel(otg_sc, &usb_dr_regs->otgsc);

	/*FIXME: ID change not generate when init to 0 */
	fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
	otg->default_a = (fsm->id == 0);

	/* process OTG interrupts */
	if (otg_int_src) {
		if (otg_int_src & OTGSC_INTSTS_USB_ID) {
			fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
			otg->default_a = (fsm->id == 0);
			/* clear conn information */
			if (fsm->id)
				fsm->b_conn = 0;
			else
				fsm->a_conn = 0;

			if (otg->host)
				otg->host->is_b_host = fsm->id;
			if (otg->gadget)
				otg->gadget->is_a_peripheral = !fsm->id;
			VDBG("ID int (ID is %d)\n", fsm->id);

			if (fsm->id) {	/* switch to gadget */
				schedule_delayed_work(
					&((struct fsl_otg *)dev_id)->otg_event,
					100);
			} else {	/* switch to host */
				cancel_delayed_work(&
						    ((struct fsl_otg *)dev_id)->
						    otg_event);
				fsl_otg_start_gadget(fsm, 0);
				otg_drv_vbus(fsm, 1);
				fsl_otg_start_host(fsm, 1);
			}
			return IRQ_HANDLED;
		}
	}
	return IRQ_NONE;
}

static struct otg_fsm_ops fsl_otg_ops = {
	.chrg_vbus = fsl_otg_chrg_vbus,
	.drv_vbus = fsl_otg_drv_vbus,
	.loc_conn = fsl_otg_loc_conn,
	.loc_sof = fsl_otg_loc_sof,
	.start_pulse = fsl_otg_start_pulse,

	.add_timer = fsl_otg_fsm_add_timer,
	.del_timer = fsl_otg_fsm_del_timer,

	.start_host = fsl_otg_start_host,
	.start_gadget = fsl_otg_start_gadget,
};

/* Initialize the global variable fsl_otg_dev and request IRQ for OTG */
static int fsl_otg_conf(struct platform_device *pdev)
{
	struct fsl_otg *fsl_otg_tc;
	int status;

	if (fsl_otg_dev)
		return 0;

	/* allocate space to fsl otg device */
	fsl_otg_tc = kzalloc(sizeof(struct fsl_otg), GFP_KERNEL);
	if (!fsl_otg_tc)
		return -ENOMEM;

	fsl_otg_tc->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL);
	if (!fsl_otg_tc->phy.otg) {
		kfree(fsl_otg_tc);
		return -ENOMEM;
	}

	INIT_DELAYED_WORK(&fsl_otg_tc->otg_event, fsl_otg_event);

	INIT_LIST_HEAD(&active_timers);
	status = fsl_otg_init_timers(&fsl_otg_tc->fsm);
	if (status) {
		pr_info("Couldn't init OTG timers\n");
		goto err;
	}
	mutex_init(&fsl_otg_tc->fsm.lock);

	/* Set OTG state machine operations */
	fsl_otg_tc->fsm.ops = &fsl_otg_ops;

	/* initialize the otg structure */
	fsl_otg_tc->phy.label = DRIVER_DESC;
	fsl_otg_tc->phy.dev = &pdev->dev;
	fsl_otg_tc->phy.set_power = fsl_otg_set_power;

	fsl_otg_tc->phy.otg->usb_phy = &fsl_otg_tc->phy;
	fsl_otg_tc->phy.otg->set_host = fsl_otg_set_host;
	fsl_otg_tc->phy.otg->set_peripheral = fsl_otg_set_peripheral;
	fsl_otg_tc->phy.otg->start_hnp = fsl_otg_start_hnp;
	fsl_otg_tc->phy.otg->start_srp = fsl_otg_start_srp;

	fsl_otg_dev = fsl_otg_tc;

	/* Store the otg transceiver */
	status = usb_add_phy(&fsl_otg_tc->phy, USB_PHY_TYPE_USB2);
	if (status) {
		pr_warn(FSL_OTG_NAME ": unable to register OTG transceiver.\n");
		goto err;
	}

	return 0;
err:
	fsl_otg_uninit_timers();
	kfree(fsl_otg_tc->phy.otg);
	kfree(fsl_otg_tc);
	return status;
}

/* OTG Initialization */
int usb_otg_start(struct platform_device *pdev)
{
	struct fsl_otg *p_otg;
	struct usb_phy *otg_trans = usb_get_phy(USB_PHY_TYPE_USB2);
	struct otg_fsm *fsm;
	int status;
	struct resource *res;
	u32 temp;
	struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);

	p_otg = container_of(otg_trans, struct fsl_otg, phy);
	fsm = &p_otg->fsm;

	/* Initialize the state machine structure with default values */
	SET_OTG_STATE(otg_trans, OTG_STATE_UNDEFINED);
	fsm->otg = p_otg->phy.otg;

	/* We don't require predefined MEM/IRQ resource index */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENXIO;

	/* We don't request_mem_region here to enable resource sharing
	 * with host/device */

	usb_dr_regs = ioremap(res->start, sizeof(struct usb_dr_mmap));
	p_otg->dr_mem_map = (struct usb_dr_mmap *)usb_dr_regs;
	pdata->regs = (void *)usb_dr_regs;

	if (pdata->init && pdata->init(pdev) != 0)
		return -EINVAL;

	if (pdata->big_endian_mmio) {
		_fsl_readl = _fsl_readl_be;
		_fsl_writel = _fsl_writel_be;
	} else {
		_fsl_readl = _fsl_readl_le;
		_fsl_writel = _fsl_writel_le;
	}

	/* request irq */
	p_otg->irq = platform_get_irq(pdev, 0);
	status = request_irq(p_otg->irq, fsl_otg_isr,
				IRQF_SHARED, driver_name, p_otg);
	if (status) {
		dev_dbg(p_otg->phy.dev, "can't get IRQ %d, error %d\n",
			p_otg->irq, status);
		iounmap(p_otg->dr_mem_map);
		kfree(p_otg->phy.otg);
		kfree(p_otg);
		return status;
	}

	/* stop the controller */
	temp = fsl_readl(&p_otg->dr_mem_map->usbcmd);
	temp &= ~USB_CMD_RUN_STOP;
	fsl_writel(temp, &p_otg->dr_mem_map->usbcmd);

	/* reset the controller */
	temp = fsl_readl(&p_otg->dr_mem_map->usbcmd);
	temp |= USB_CMD_CTRL_RESET;
	fsl_writel(temp, &p_otg->dr_mem_map->usbcmd);

	/* wait reset completed */
	while (fsl_readl(&p_otg->dr_mem_map->usbcmd) & USB_CMD_CTRL_RESET)
		;

	/* configure the VBUSHS as IDLE(both host and device) */
	temp = USB_MODE_STREAM_DISABLE | (pdata->es ? USB_MODE_ES : 0);
	fsl_writel(temp, &p_otg->dr_mem_map->usbmode);

	/* configure PHY interface */
	temp = fsl_readl(&p_otg->dr_mem_map->portsc);
	temp &= ~(PORTSC_PHY_TYPE_SEL | PORTSC_PTW);
	switch (pdata->phy_mode) {
	case FSL_USB2_PHY_ULPI:
		temp |= PORTSC_PTS_ULPI;
		break;
	case FSL_USB2_PHY_UTMI_WIDE:
		temp |= PORTSC_PTW_16BIT;
		/* fall through */
	case FSL_USB2_PHY_UTMI:
		temp |= PORTSC_PTS_UTMI;
		/* fall through */
	default:
		break;
	}
	fsl_writel(temp, &p_otg->dr_mem_map->portsc);

	if (pdata->have_sysif_regs) {
		/* configure control enable IO output, big endian register */
		temp = __raw_readl(&p_otg->dr_mem_map->control);
		temp |= USB_CTRL_IOENB;
		__raw_writel(temp, &p_otg->dr_mem_map->control);
	}

	/* disable all interrupt and clear all OTGSC status */
	temp = fsl_readl(&p_otg->dr_mem_map->otgsc);
	temp &= ~OTGSC_INTERRUPT_ENABLE_BITS_MASK;
	temp |= OTGSC_INTERRUPT_STATUS_BITS_MASK | OTGSC_CTRL_VBUS_DISCHARGE;
	fsl_writel(temp, &p_otg->dr_mem_map->otgsc);

	/*
	 * The identification (id) input is FALSE when a Mini-A plug is inserted
	 * in the devices Mini-AB receptacle. Otherwise, this input is TRUE.
	 * Also: record initial state of ID pin
	 */
	if (fsl_readl(&p_otg->dr_mem_map->otgsc) & OTGSC_STS_USB_ID) {
		p_otg->phy.otg->state = OTG_STATE_UNDEFINED;
		p_otg->fsm.id = 1;
	} else {
		p_otg->phy.otg->state = OTG_STATE_A_IDLE;
		p_otg->fsm.id = 0;
	}

	pr_debug("initial ID pin=%d\n", p_otg->fsm.id);

	/* enable OTG ID pin interrupt */
	temp = fsl_readl(&p_otg->dr_mem_map->otgsc);
	temp |= OTGSC_INTR_USB_ID_EN;
	temp &= ~(OTGSC_CTRL_VBUS_DISCHARGE | OTGSC_INTR_1MS_TIMER_EN);
	fsl_writel(temp, &p_otg->dr_mem_map->otgsc);

	return 0;
}

/*
 * state file in sysfs
 */
static int show_fsl_usb2_otg_state(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct otg_fsm *fsm = &fsl_otg_dev->fsm;
	char *next = buf;
	unsigned size = PAGE_SIZE;
	int t;

	mutex_lock(&fsm->lock);

	/* basic driver infomation */
	t = scnprintf(next, size,
			DRIVER_DESC "\n" "fsl_usb2_otg version: %s\n\n",
			DRIVER_VERSION);
	size -= t;
	next += t;

	/* Registers */
	t = scnprintf(next, size,
			"OTGSC:   0x%08x\n"
			"PORTSC:  0x%08x\n"
			"USBMODE: 0x%08x\n"
			"USBCMD:  0x%08x\n"
			"USBSTS:  0x%08x\n"
			"USBINTR: 0x%08x\n",
			fsl_readl(&usb_dr_regs->otgsc),
			fsl_readl(&usb_dr_regs->portsc),
			fsl_readl(&usb_dr_regs->usbmode),
			fsl_readl(&usb_dr_regs->usbcmd),
			fsl_readl(&usb_dr_regs->usbsts),
			fsl_readl(&usb_dr_regs->usbintr));
	size -= t;
	next += t;

	/* State */
	t = scnprintf(next, size,
		      "OTG state: %s\n\n",
		      usb_otg_state_string(fsl_otg_dev->phy.otg->state));
	size -= t;
	next += t;

	/* State Machine Variables */
	t = scnprintf(next, size,
			"a_bus_req: %d\n"
			"b_bus_req: %d\n"
			"a_bus_resume: %d\n"
			"a_bus_suspend: %d\n"
			"a_conn: %d\n"
			"a_sess_vld: %d\n"
			"a_srp_det: %d\n"
			"a_vbus_vld: %d\n"
			"b_bus_resume: %d\n"
			"b_bus_suspend: %d\n"
			"b_conn: %d\n"
			"b_se0_srp: %d\n"
			"b_ssend_srp: %d\n"
			"b_sess_vld: %d\n"
			"id: %d\n",
			fsm->a_bus_req,
			fsm->b_bus_req,
			fsm->a_bus_resume,
			fsm->a_bus_suspend,
			fsm->a_conn,
			fsm->a_sess_vld,
			fsm->a_srp_det,
			fsm->a_vbus_vld,
			fsm->b_bus_resume,
			fsm->b_bus_suspend,
			fsm->b_conn,
			fsm->b_se0_srp,
			fsm->b_ssend_srp,
			fsm->b_sess_vld,
			fsm->id);
	size -= t;
	next += t;

	mutex_unlock(&fsm->lock);

	return PAGE_SIZE - size;
}

static DEVICE_ATTR(fsl_usb2_otg_state, S_IRUGO, show_fsl_usb2_otg_state, NULL);


/* Char driver interface to control some OTG input */

/*
 * Handle some ioctl command, such as get otg
 * status and set host suspend
 */
static long fsl_otg_ioctl(struct file *file, unsigned int cmd,
			  unsigned long arg)
{
	u32 retval = 0;

	switch (cmd) {
	case GET_OTG_STATUS:
		retval = fsl_otg_dev->host_working;
		break;

	case SET_A_SUSPEND_REQ:
		fsl_otg_dev->fsm.a_suspend_req_inf = arg;
		break;

	case SET_A_BUS_DROP:
		fsl_otg_dev->fsm.a_bus_drop = arg;
		break;

	case SET_A_BUS_REQ:
		fsl_otg_dev->fsm.a_bus_req = arg;
		break;

	case SET_B_BUS_REQ:
		fsl_otg_dev->fsm.b_bus_req = arg;
		break;

	default:
		break;
	}

	otg_statemachine(&fsl_otg_dev->fsm);

	return retval;
}

static int fsl_otg_open(struct inode *inode, struct file *file)
{
	return 0;
}

static int fsl_otg_release(struct inode *inode, struct file *file)
{
	return 0;
}

static const struct file_operations otg_fops = {
	.owner = THIS_MODULE,
	.llseek = NULL,
	.read = NULL,
	.write = NULL,
	.unlocked_ioctl = fsl_otg_ioctl,
	.open = fsl_otg_open,
	.release = fsl_otg_release,
};

static int fsl_otg_probe(struct platform_device *pdev)
{
	int ret;

	if (!dev_get_platdata(&pdev->dev))
		return -ENODEV;

	/* configure the OTG */
	ret = fsl_otg_conf(pdev);
	if (ret) {
		dev_err(&pdev->dev, "Couldn't configure OTG module\n");
		return ret;
	}

	/* start OTG */
	ret = usb_otg_start(pdev);
	if (ret) {
		dev_err(&pdev->dev, "Can't init FSL OTG device\n");
		return ret;
	}

	ret = register_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME, &otg_fops);
	if (ret) {
		dev_err(&pdev->dev, "unable to register FSL OTG device\n");
		return ret;
	}

	ret = device_create_file(&pdev->dev, &dev_attr_fsl_usb2_otg_state);
	if (ret)
		dev_warn(&pdev->dev, "Can't register sysfs attribute\n");

	return ret;
}

static int fsl_otg_remove(struct platform_device *pdev)
{
	struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);

	usb_remove_phy(&fsl_otg_dev->phy);
	free_irq(fsl_otg_dev->irq, fsl_otg_dev);

	iounmap((void *)usb_dr_regs);

	fsl_otg_uninit_timers();
	kfree(fsl_otg_dev->phy.otg);
	kfree(fsl_otg_dev);

	device_remove_file(&pdev->dev, &dev_attr_fsl_usb2_otg_state);

	unregister_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME);

	if (pdata->exit)
		pdata->exit(pdev);

	return 0;
}

struct platform_driver fsl_otg_driver = {
	.probe = fsl_otg_probe,
	.remove = fsl_otg_remove,
	.driver = {
		.name = driver_name,
		.owner = THIS_MODULE,
	},
};

module_platform_driver(fsl_otg_driver);

MODULE_DESCRIPTION(DRIVER_INFO);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_LICENSE("GPL");