summaryrefslogtreecommitdiff
path: root/drivers/usb/dwc2/core.h
blob: 71b3b08ad516c9fb3bfbd403da1687b5825e7e14 (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
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
 * core.h - DesignWare HS OTG Controller common declarations
 *
 * Copyright (C) 2004-2013 Synopsys, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the above-listed copyright holders may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __DWC2_CORE_H__
#define __DWC2_CORE_H__

#include <linux/phy/phy.h>
#include <linux/regulator/consumer.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
#include <linux/usb/phy.h>
#include "hw.h"

/*
 * Suggested defines for tracers:
 * - no_printk:    Disable tracing
 * - pr_info:      Print this info to the console
 * - trace_printk: Print this info to trace buffer (good for verbose logging)
 */

#define DWC2_TRACE_SCHEDULER		no_printk
#define DWC2_TRACE_SCHEDULER_VB		no_printk

/* Detailed scheduler tracing, but won't overwhelm console */
#define dwc2_sch_dbg(hsotg, fmt, ...)					\
	DWC2_TRACE_SCHEDULER(pr_fmt("%s: SCH: " fmt),			\
			     dev_name(hsotg->dev), ##__VA_ARGS__)

/* Verbose scheduler tracing */
#define dwc2_sch_vdbg(hsotg, fmt, ...)					\
	DWC2_TRACE_SCHEDULER_VB(pr_fmt("%s: SCH: " fmt),		\
				dev_name(hsotg->dev), ##__VA_ARGS__)

#ifdef CONFIG_MIPS
/*
 * There are some MIPS machines that can run in either big-endian
 * or little-endian mode and that use the dwc2 register without
 * a byteswap in both ways.
 * Unlike other architectures, MIPS apparently does not require a
 * barrier before the __raw_writel() to synchronize with DMA but does
 * require the barrier after the __raw_writel() to serialize a set of
 * writes. This set of operations was added specifically for MIPS and
 * should only be used there.
 */
static inline u32 dwc2_readl(const void __iomem *addr)
{
	u32 value = __raw_readl(addr);

	/* In order to preserve endianness __raw_* operation is used. Therefore
	 * a barrier is needed to ensure IO access is not re-ordered across
	 * reads or writes
	 */
	mb();
	return value;
}

static inline void dwc2_writel(u32 value, void __iomem *addr)
{
	__raw_writel(value, addr);

	/*
	 * In order to preserve endianness __raw_* operation is used. Therefore
	 * a barrier is needed to ensure IO access is not re-ordered across
	 * reads or writes
	 */
	mb();
#ifdef DWC2_LOG_WRITES
	pr_info("INFO:: wrote %08x to %p\n", value, addr);
#endif
}
#else
/* Normal architectures just use readl/write */
static inline u32 dwc2_readl(const void __iomem *addr)
{
	return readl(addr);
}

static inline void dwc2_writel(u32 value, void __iomem *addr)
{
	writel(value, addr);

#ifdef DWC2_LOG_WRITES
	pr_info("info:: wrote %08x to %p\n", value, addr);
#endif
}
#endif

/* Maximum number of Endpoints/HostChannels */
#define MAX_EPS_CHANNELS	16

/* dwc2-hsotg declarations */
static const char * const dwc2_hsotg_supply_names[] = {
	"vusb_d",               /* digital USB supply, 1.2V */
	"vusb_a",               /* analog USB supply, 1.1V */
};

#define DWC2_NUM_SUPPLIES ARRAY_SIZE(dwc2_hsotg_supply_names)

/*
 * EP0_MPS_LIMIT
 *
 * Unfortunately there seems to be a limit of the amount of data that can
 * be transferred by IN transactions on EP0. This is either 127 bytes or 3
 * packets (which practically means 1 packet and 63 bytes of data) when the
 * MPS is set to 64.
 *
 * This means if we are wanting to move >127 bytes of data, we need to
 * split the transactions up, but just doing one packet at a time does
 * not work (this may be an implicit DATA0 PID on first packet of the
 * transaction) and doing 2 packets is outside the controller's limits.
 *
 * If we try to lower the MPS size for EP0, then no transfers work properly
 * for EP0, and the system will fail basic enumeration. As no cause for this
 * has currently been found, we cannot support any large IN transfers for
 * EP0.
 */
#define EP0_MPS_LIMIT   64

struct dwc2_hsotg;
struct dwc2_hsotg_req;

/**
 * struct dwc2_hsotg_ep - driver endpoint definition.
 * @ep: The gadget layer representation of the endpoint.
 * @name: The driver generated name for the endpoint.
 * @queue: Queue of requests for this endpoint.
 * @parent: Reference back to the parent device structure.
 * @req: The current request that the endpoint is processing. This is
 *       used to indicate an request has been loaded onto the endpoint
 *       and has yet to be completed (maybe due to data move, or simply
 *       awaiting an ack from the core all the data has been completed).
 * @debugfs: File entry for debugfs file for this endpoint.
 * @dir_in: Set to true if this endpoint is of the IN direction, which
 *          means that it is sending data to the Host.
 * @index: The index for the endpoint registers.
 * @mc: Multi Count - number of transactions per microframe
 * @interval: Interval for periodic endpoints, in frames or microframes.
 * @name: The name array passed to the USB core.
 * @halted: Set if the endpoint has been halted.
 * @periodic: Set if this is a periodic ep, such as Interrupt
 * @isochronous: Set if this is a isochronous ep
 * @send_zlp: Set if we need to send a zero-length packet.
 * @desc_list_dma: The DMA address of descriptor chain currently in use.
 * @desc_list: Pointer to descriptor DMA chain head currently in use.
 * @desc_count: Count of entries within the DMA descriptor chain of EP.
 * @next_desc: index of next free descriptor in the ISOC chain under SW control.
 * @compl_desc: index of next descriptor to be completed by xFerComplete
 * @total_data: The total number of data bytes done.
 * @fifo_size: The size of the FIFO (for periodic IN endpoints)
 * @fifo_index: For Dedicated FIFO operation, only FIFO0 can be used for EP0.
 * @fifo_load: The amount of data loaded into the FIFO (periodic IN)
 * @last_load: The offset of data for the last start of request.
 * @size_loaded: The last loaded size for DxEPTSIZE for periodic IN
 * @target_frame: Targeted frame num to setup next ISOC transfer
 * @frame_overrun: Indicates SOF number overrun in DSTS
 *
 * This is the driver's state for each registered enpoint, allowing it
 * to keep track of transactions that need doing. Each endpoint has a
 * lock to protect the state, to try and avoid using an overall lock
 * for the host controller as much as possible.
 *
 * For periodic IN endpoints, we have fifo_size and fifo_load to try
 * and keep track of the amount of data in the periodic FIFO for each
 * of these as we don't have a status register that tells us how much
 * is in each of them. (note, this may actually be useless information
 * as in shared-fifo mode periodic in acts like a single-frame packet
 * buffer than a fifo)
 */
struct dwc2_hsotg_ep {
	struct usb_ep           ep;
	struct list_head        queue;
	struct dwc2_hsotg       *parent;
	struct dwc2_hsotg_req    *req;
	struct dentry           *debugfs;

	unsigned long           total_data;
	unsigned int            size_loaded;
	unsigned int            last_load;
	unsigned int            fifo_load;
	unsigned short          fifo_size;
	unsigned short		fifo_index;

	unsigned char           dir_in;
	unsigned char           index;
	unsigned char           mc;
	u16                     interval;

	unsigned int            halted:1;
	unsigned int            periodic:1;
	unsigned int            isochronous:1;
	unsigned int            send_zlp:1;
	unsigned int            target_frame;
#define TARGET_FRAME_INITIAL   0xFFFFFFFF
	bool			frame_overrun;

	dma_addr_t		desc_list_dma;
	struct dwc2_dma_desc	*desc_list;
	u8			desc_count;

	unsigned int		next_desc;
	unsigned int		compl_desc;

	char                    name[10];
};

/**
 * struct dwc2_hsotg_req - data transfer request
 * @req: The USB gadget request
 * @queue: The list of requests for the endpoint this is queued for.
 * @saved_req_buf: variable to save req.buf when bounce buffers are used.
 */
struct dwc2_hsotg_req {
	struct usb_request      req;
	struct list_head        queue;
	void *saved_req_buf;
};

#if IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL) || \
	IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
#define call_gadget(_hs, _entry) \
do { \
	if ((_hs)->gadget.speed != USB_SPEED_UNKNOWN && \
		(_hs)->driver && (_hs)->driver->_entry) { \
		spin_unlock(&_hs->lock); \
		(_hs)->driver->_entry(&(_hs)->gadget); \
		spin_lock(&_hs->lock); \
	} \
} while (0)
#else
#define call_gadget(_hs, _entry)	do {} while (0)
#endif

struct dwc2_hsotg;
struct dwc2_host_chan;

/* Device States */
enum dwc2_lx_state {
	DWC2_L0,	/* On state */
	DWC2_L1,	/* LPM sleep state */
	DWC2_L2,	/* USB suspend state */
	DWC2_L3,	/* Off state */
};

/* Gadget ep0 states */
enum dwc2_ep0_state {
	DWC2_EP0_SETUP,
	DWC2_EP0_DATA_IN,
	DWC2_EP0_DATA_OUT,
	DWC2_EP0_STATUS_IN,
	DWC2_EP0_STATUS_OUT,
};

/**
 * struct dwc2_core_params - Parameters for configuring the core
 *
 * @otg_cap:            Specifies the OTG capabilities.
 *                       0 - HNP and SRP capable
 *                       1 - SRP Only capable
 *                       2 - No HNP/SRP capable (always available)
 *                      Defaults to best available option (0, 1, then 2)
 * @host_dma:           Specifies whether to use slave or DMA mode for accessing
 *                      the data FIFOs. The driver will automatically detect the
 *                      value for this parameter if none is specified.
 *                       0 - Slave (always available)
 *                       1 - DMA (default, if available)
 * @dma_desc_enable:    When DMA mode is enabled, specifies whether to use
 *                      address DMA mode or descriptor DMA mode for accessing
 *                      the data FIFOs. The driver will automatically detect the
 *                      value for this if none is specified.
 *                       0 - Address DMA
 *                       1 - Descriptor DMA (default, if available)
 * @dma_desc_fs_enable: When DMA mode is enabled, specifies whether to use
 *                      address DMA mode or descriptor DMA mode for accessing
 *                      the data FIFOs in Full Speed mode only. The driver
 *                      will automatically detect the value for this if none is
 *                      specified.
 *                       0 - Address DMA
 *                       1 - Descriptor DMA in FS (default, if available)
 * @speed:              Specifies the maximum speed of operation in host and
 *                      device mode. The actual speed depends on the speed of
 *                      the attached device and the value of phy_type.
 *                       0 - High Speed
 *                           (default when phy_type is UTMI+ or ULPI)
 *                       1 - Full Speed
 *                           (default when phy_type is Full Speed)
 * @enable_dynamic_fifo: 0 - Use coreConsultant-specified FIFO size parameters
 *                       1 - Allow dynamic FIFO sizing (default, if available)
 * @en_multiple_tx_fifo: Specifies whether dedicated per-endpoint transmit FIFOs
 *                      are enabled for non-periodic IN endpoints in device
 *                      mode.
 * @host_rx_fifo_size:  Number of 4-byte words in the Rx FIFO in host mode when
 *                      dynamic FIFO sizing is enabled
 *                       16 to 32768
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @host_nperio_tx_fifo_size: Number of 4-byte words in the non-periodic Tx FIFO
 *                      in host mode when dynamic FIFO sizing is enabled
 *                       16 to 32768
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @host_perio_tx_fifo_size: Number of 4-byte words in the periodic Tx FIFO in
 *                      host mode when dynamic FIFO sizing is enabled
 *                       16 to 32768
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @max_transfer_size:  The maximum transfer size supported, in bytes
 *                       2047 to 65,535
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @max_packet_count:   The maximum number of packets in a transfer
 *                       15 to 511
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @host_channels:      The number of host channel registers to use
 *                       1 to 16
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @phy_type:           Specifies the type of PHY interface to use. By default,
 *                      the driver will automatically detect the phy_type.
 *                       0 - Full Speed Phy
 *                       1 - UTMI+ Phy
 *                       2 - ULPI Phy
 *                      Defaults to best available option (2, 1, then 0)
 * @phy_utmi_width:     Specifies the UTMI+ Data Width (in bits). This parameter
 *                      is applicable for a phy_type of UTMI+ or ULPI. (For a
 *                      ULPI phy_type, this parameter indicates the data width
 *                      between the MAC and the ULPI Wrapper.) Also, this
 *                      parameter is applicable only if the OTG_HSPHY_WIDTH cC
 *                      parameter was set to "8 and 16 bits", meaning that the
 *                      core has been configured to work at either data path
 *                      width.
 *                       8 or 16 (default 16 if available)
 * @phy_ulpi_ddr:       Specifies whether the ULPI operates at double or single
 *                      data rate. This parameter is only applicable if phy_type
 *                      is ULPI.
 *                       0 - single data rate ULPI interface with 8 bit wide
 *                           data bus (default)
 *                       1 - double data rate ULPI interface with 4 bit wide
 *                           data bus
 * @phy_ulpi_ext_vbus:  For a ULPI phy, specifies whether to use the internal or
 *                      external supply to drive the VBus
 *                       0 - Internal supply (default)
 *                       1 - External supply
 * @i2c_enable:         Specifies whether to use the I2Cinterface for a full
 *                      speed PHY. This parameter is only applicable if phy_type
 *                      is FS.
 *                       0 - No (default)
 *                       1 - Yes
 * @ipg_isoc_en:        Indicates the IPG supports is enabled or disabled.
 *                       0 - Disable (default)
 *                       1 - Enable
 * @acg_enable:		For enabling Active Clock Gating in the controller
 *                       0 - No
 *                       1 - Yes
 * @ulpi_fs_ls:         Make ULPI phy operate in FS/LS mode only
 *                       0 - No (default)
 *                       1 - Yes
 * @host_support_fs_ls_low_power: Specifies whether low power mode is supported
 *                      when attached to a Full Speed or Low Speed device in
 *                      host mode.
 *                       0 - Don't support low power mode (default)
 *                       1 - Support low power mode
 * @host_ls_low_power_phy_clk: Specifies the PHY clock rate in low power mode
 *                      when connected to a Low Speed device in host
 *                      mode. This parameter is applicable only if
 *                      host_support_fs_ls_low_power is enabled.
 *                       0 - 48 MHz
 *                           (default when phy_type is UTMI+ or ULPI)
 *                       1 - 6 MHz
 *                           (default when phy_type is Full Speed)
 * @oc_disable:		Flag to disable overcurrent condition.
 *			0 - Allow overcurrent condition to get detected
 *			1 - Disable overcurrent condtion to get detected
 * @ts_dline:           Enable Term Select Dline pulsing
 *                       0 - No (default)
 *                       1 - Yes
 * @reload_ctl:         Allow dynamic reloading of HFIR register during runtime
 *                       0 - No (default for core < 2.92a)
 *                       1 - Yes (default for core >= 2.92a)
 * @ahbcfg:             This field allows the default value of the GAHBCFG
 *                      register to be overridden
 *                       -1         - GAHBCFG value will be set to 0x06
 *                                    (INCR, default)
 *                       all others - GAHBCFG value will be overridden with
 *                                    this value
 *                      Not all bits can be controlled like this, the
 *                      bits defined by GAHBCFG_CTRL_MASK are controlled
 *                      by the driver and are ignored in this
 *                      configuration value.
 * @uframe_sched:       True to enable the microframe scheduler
 * @external_id_pin_ctl: Specifies whether ID pin is handled externally.
 *                      Disable CONIDSTSCHNG controller interrupt in such
 *                      case.
 *                      0 - No (default)
 *                      1 - Yes
 * @power_down:         Specifies whether the controller support power_down.
 *			If power_down is enabled, the controller will enter
 *			power_down in both peripheral and host mode when
 *			needed.
 *			0 - No (default)
 *			1 - Partial power down
 *			2 - Hibernation
 * @lpm:		Enable LPM support.
 *			0 - No
 *			1 - Yes
 * @lpm_clock_gating:		Enable core PHY clock gating.
 *			0 - No
 *			1 - Yes
 * @besl:		Enable LPM Errata support.
 *			0 - No
 *			1 - Yes
 * @hird_threshold_en:	HIRD or HIRD Threshold enable.
 *			0 - No
 *			1 - Yes
 * @hird_threshold:	Value of BESL or HIRD Threshold.
 * @activate_stm_fs_transceiver: Activate internal transceiver using GGPIO
 *			register.
 *			0 - Deactivate the transceiver (default)
 *			1 - Activate the transceiver
 * @g_dma:              Enables gadget dma usage (default: autodetect).
 * @g_dma_desc:         Enables gadget descriptor DMA (default: autodetect).
 * @g_rx_fifo_size:	The periodic rx fifo size for the device, in
 *			DWORDS from 16-32768 (default: 2048 if
 *			possible, otherwise autodetect).
 * @g_np_tx_fifo_size:	The non-periodic tx fifo size for the device in
 *			DWORDS from 16-32768 (default: 1024 if
 *			possible, otherwise autodetect).
 * @g_tx_fifo_size:	An array of TX fifo sizes in dedicated fifo
 *			mode. Each value corresponds to one EP
 *			starting from EP1 (max 15 values). Sizes are
 *			in DWORDS with possible values from from
 *			16-32768 (default: 256, 256, 256, 256, 768,
 *			768, 768, 768, 0, 0, 0, 0, 0, 0, 0).
 * @change_speed_quirk: Change speed configuration to DWC2_SPEED_PARAM_FULL
 *                      while full&low speed device connect. And change speed
 *                      back to DWC2_SPEED_PARAM_HIGH while device is gone.
 *			0 - No (default)
 *			1 - Yes
 *
 * The following parameters may be specified when starting the module. These
 * parameters define how the DWC_otg controller should be configured. A
 * value of -1 (or any other out of range value) for any parameter means
 * to read the value from hardware (if possible) or use the builtin
 * default described above.
 */
struct dwc2_core_params {
	u8 otg_cap;
#define DWC2_CAP_PARAM_HNP_SRP_CAPABLE		0
#define DWC2_CAP_PARAM_SRP_ONLY_CAPABLE		1
#define DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE	2

	u8 phy_type;
#define DWC2_PHY_TYPE_PARAM_FS		0
#define DWC2_PHY_TYPE_PARAM_UTMI	1
#define DWC2_PHY_TYPE_PARAM_ULPI	2

	u8 speed;
#define DWC2_SPEED_PARAM_HIGH	0
#define DWC2_SPEED_PARAM_FULL	1
#define DWC2_SPEED_PARAM_LOW	2

	u8 phy_utmi_width;
	bool phy_ulpi_ddr;
	bool phy_ulpi_ext_vbus;
	bool enable_dynamic_fifo;
	bool en_multiple_tx_fifo;
	bool i2c_enable;
	bool acg_enable;
	bool ulpi_fs_ls;
	bool ts_dline;
	bool reload_ctl;
	bool uframe_sched;
	bool external_id_pin_ctl;

	int power_down;
#define DWC2_POWER_DOWN_PARAM_NONE		0
#define DWC2_POWER_DOWN_PARAM_PARTIAL		1
#define DWC2_POWER_DOWN_PARAM_HIBERNATION	2

	bool lpm;
	bool lpm_clock_gating;
	bool besl;
	bool hird_threshold_en;
	u8 hird_threshold;
	bool activate_stm_fs_transceiver;
	bool ipg_isoc_en;
	u16 max_packet_count;
	u32 max_transfer_size;
	u32 ahbcfg;

	/* Host parameters */
	bool host_dma;
	bool dma_desc_enable;
	bool dma_desc_fs_enable;
	bool host_support_fs_ls_low_power;
	bool host_ls_low_power_phy_clk;
	bool oc_disable;

	u8 host_channels;
	u16 host_rx_fifo_size;
	u16 host_nperio_tx_fifo_size;
	u16 host_perio_tx_fifo_size;

	/* Gadget parameters */
	bool g_dma;
	bool g_dma_desc;
	u32 g_rx_fifo_size;
	u32 g_np_tx_fifo_size;
	u32 g_tx_fifo_size[MAX_EPS_CHANNELS];

	bool change_speed_quirk;
};

/**
 * struct dwc2_hw_params - Autodetected parameters.
 *
 * These parameters are the various parameters read from hardware
 * registers during initialization. They typically contain the best
 * supported or maximum value that can be configured in the
 * corresponding dwc2_core_params value.
 *
 * The values that are not in dwc2_core_params are documented below.
 *
 * @op_mode:             Mode of Operation
 *                       0 - HNP- and SRP-Capable OTG (Host & Device)
 *                       1 - SRP-Capable OTG (Host & Device)
 *                       2 - Non-HNP and Non-SRP Capable OTG (Host & Device)
 *                       3 - SRP-Capable Device
 *                       4 - Non-OTG Device
 *                       5 - SRP-Capable Host
 *                       6 - Non-OTG Host
 * @arch:                Architecture
 *                       0 - Slave only
 *                       1 - External DMA
 *                       2 - Internal DMA
 * @ipg_isoc_en:        This feature indicates that the controller supports
 *                      the worst-case scenario of Rx followed by Rx
 *                      Interpacket Gap (IPG) (32 bitTimes) as per the utmi
 *                      specification for any token following ISOC OUT token.
 *                       0 - Don't support
 *                       1 - Support
 * @power_optimized:    Are power optimizations enabled?
 * @num_dev_ep:         Number of device endpoints available
 * @num_dev_in_eps:     Number of device IN endpoints available
 * @num_dev_perio_in_ep: Number of device periodic IN endpoints
 *                       available
 * @dev_token_q_depth:  Device Mode IN Token Sequence Learning Queue
 *                      Depth
 *                       0 to 30
 * @host_perio_tx_q_depth:
 *                      Host Mode Periodic Request Queue Depth
 *                       2, 4 or 8
 * @nperio_tx_q_depth:
 *                      Non-Periodic Request Queue Depth
 *                       2, 4 or 8
 * @hs_phy_type:         High-speed PHY interface type
 *                       0 - High-speed interface not supported
 *                       1 - UTMI+
 *                       2 - ULPI
 *                       3 - UTMI+ and ULPI
 * @fs_phy_type:         Full-speed PHY interface type
 *                       0 - Full speed interface not supported
 *                       1 - Dedicated full speed interface
 *                       2 - FS pins shared with UTMI+ pins
 *                       3 - FS pins shared with ULPI pins
 * @total_fifo_size:    Total internal RAM for FIFOs (bytes)
 * @hibernation:	Is hibernation enabled?
 * @utmi_phy_data_width: UTMI+ PHY data width
 *                       0 - 8 bits
 *                       1 - 16 bits
 *                       2 - 8 or 16 bits
 * @snpsid:             Value from SNPSID register
 * @dev_ep_dirs:        Direction of device endpoints (GHWCFG1)
 * @g_tx_fifo_size:	Power-on values of TxFIFO sizes
 * @dma_desc_enable:    When DMA mode is enabled, specifies whether to use
 *                      address DMA mode or descriptor DMA mode for accessing
 *                      the data FIFOs. The driver will automatically detect the
 *                      value for this if none is specified.
 *                       0 - Address DMA
 *                       1 - Descriptor DMA (default, if available)
 * @enable_dynamic_fifo: 0 - Use coreConsultant-specified FIFO size parameters
 *                       1 - Allow dynamic FIFO sizing (default, if available)
 * @en_multiple_tx_fifo: Specifies whether dedicated per-endpoint transmit FIFOs
 *                      are enabled for non-periodic IN endpoints in device
 *                      mode.
 * @host_nperio_tx_fifo_size: Number of 4-byte words in the non-periodic Tx FIFO
 *                      in host mode when dynamic FIFO sizing is enabled
 *                       16 to 32768
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @host_perio_tx_fifo_size: Number of 4-byte words in the periodic Tx FIFO in
 *                      host mode when dynamic FIFO sizing is enabled
 *                       16 to 32768
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @max_transfer_size:  The maximum transfer size supported, in bytes
 *                       2047 to 65,535
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @max_packet_count:   The maximum number of packets in a transfer
 *                       15 to 511
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @host_channels:      The number of host channel registers to use
 *                       1 to 16
 *                      Actual maximum value is autodetected and also
 *                      the default.
 * @dev_nperio_tx_fifo_size: Number of 4-byte words in the non-periodic Tx FIFO
 *			     in device mode when dynamic FIFO sizing is enabled
 *			     16 to 32768
 *			     Actual maximum value is autodetected and also
 *			     the default.
 * @i2c_enable:         Specifies whether to use the I2Cinterface for a full
 *                      speed PHY. This parameter is only applicable if phy_type
 *                      is FS.
 *                       0 - No (default)
 *                       1 - Yes
 * @acg_enable:		For enabling Active Clock Gating in the controller
 *                       0 - Disable
 *                       1 - Enable
 * @lpm_mode:		For enabling Link Power Management in the controller
 *                       0 - Disable
 *                       1 - Enable
 * @rx_fifo_size:	Number of 4-byte words in the  Rx FIFO when dynamic
 *			FIFO sizing is enabled 16 to 32768
 *			Actual maximum value is autodetected and also
 *			the default.
 */
struct dwc2_hw_params {
	unsigned op_mode:3;
	unsigned arch:2;
	unsigned dma_desc_enable:1;
	unsigned enable_dynamic_fifo:1;
	unsigned en_multiple_tx_fifo:1;
	unsigned rx_fifo_size:16;
	unsigned host_nperio_tx_fifo_size:16;
	unsigned dev_nperio_tx_fifo_size:16;
	unsigned host_perio_tx_fifo_size:16;
	unsigned nperio_tx_q_depth:3;
	unsigned host_perio_tx_q_depth:3;
	unsigned dev_token_q_depth:5;
	unsigned max_transfer_size:26;
	unsigned max_packet_count:11;
	unsigned host_channels:5;
	unsigned hs_phy_type:2;
	unsigned fs_phy_type:2;
	unsigned i2c_enable:1;
	unsigned acg_enable:1;
	unsigned num_dev_ep:4;
	unsigned num_dev_in_eps : 4;
	unsigned num_dev_perio_in_ep:4;
	unsigned total_fifo_size:16;
	unsigned power_optimized:1;
	unsigned hibernation:1;
	unsigned utmi_phy_data_width:2;
	unsigned lpm_mode:1;
	unsigned ipg_isoc_en:1;
	u32 snpsid;
	u32 dev_ep_dirs;
	u32 g_tx_fifo_size[MAX_EPS_CHANNELS];
};

/* Size of control and EP0 buffers */
#define DWC2_CTRL_BUFF_SIZE 8

/**
 * struct dwc2_gregs_backup - Holds global registers state before
 * entering partial power down
 * @gotgctl:		Backup of GOTGCTL register
 * @gintmsk:		Backup of GINTMSK register
 * @gahbcfg:		Backup of GAHBCFG register
 * @gusbcfg:		Backup of GUSBCFG register
 * @grxfsiz:		Backup of GRXFSIZ register
 * @gnptxfsiz:		Backup of GNPTXFSIZ register
 * @gi2cctl:		Backup of GI2CCTL register
 * @glpmcfg:		Backup of GLPMCFG register
 * @gdfifocfg:		Backup of GDFIFOCFG register
 * @pcgcctl:		Backup of PCGCCTL register
 * @pcgcctl1:		Backup of PCGCCTL1 register
 * @dtxfsiz:		Backup of DTXFSIZ registers for each endpoint
 * @gpwrdn:		Backup of GPWRDN register
 * @valid:		True if registers values backuped.
 */
struct dwc2_gregs_backup {
	u32 gotgctl;
	u32 gintmsk;
	u32 gahbcfg;
	u32 gusbcfg;
	u32 grxfsiz;
	u32 gnptxfsiz;
	u32 gi2cctl;
	u32 glpmcfg;
	u32 pcgcctl;
	u32 pcgcctl1;
	u32 gdfifocfg;
	u32 gpwrdn;
	bool valid;
};

/**
 * struct dwc2_dregs_backup - Holds device registers state before
 * entering partial power down
 * @dcfg:		Backup of DCFG register
 * @dctl:		Backup of DCTL register
 * @daintmsk:		Backup of DAINTMSK register
 * @diepmsk:		Backup of DIEPMSK register
 * @doepmsk:		Backup of DOEPMSK register
 * @diepctl:		Backup of DIEPCTL register
 * @dieptsiz:		Backup of DIEPTSIZ register
 * @diepdma:		Backup of DIEPDMA register
 * @doepctl:		Backup of DOEPCTL register
 * @doeptsiz:		Backup of DOEPTSIZ register
 * @doepdma:		Backup of DOEPDMA register
 * @dtxfsiz:		Backup of DTXFSIZ registers for each endpoint
 * @valid:      True if registers values backuped.
 */
struct dwc2_dregs_backup {
	u32 dcfg;
	u32 dctl;
	u32 daintmsk;
	u32 diepmsk;
	u32 doepmsk;
	u32 diepctl[MAX_EPS_CHANNELS];
	u32 dieptsiz[MAX_EPS_CHANNELS];
	u32 diepdma[MAX_EPS_CHANNELS];
	u32 doepctl[MAX_EPS_CHANNELS];
	u32 doeptsiz[MAX_EPS_CHANNELS];
	u32 doepdma[MAX_EPS_CHANNELS];
	u32 dtxfsiz[MAX_EPS_CHANNELS];
	bool valid;
};

/**
 * struct dwc2_hregs_backup - Holds host registers state before
 * entering partial power down
 * @hcfg:		Backup of HCFG register
 * @haintmsk:		Backup of HAINTMSK register
 * @hcintmsk:		Backup of HCINTMSK register
 * @hprt0:		Backup of HPTR0 register
 * @hfir:		Backup of HFIR register
 * @hptxfsiz:		Backup of HPTXFSIZ register
 * @valid:      True if registers values backuped.
 */
struct dwc2_hregs_backup {
	u32 hcfg;
	u32 haintmsk;
	u32 hcintmsk[MAX_EPS_CHANNELS];
	u32 hprt0;
	u32 hfir;
	u32 hptxfsiz;
	bool valid;
};

/*
 * Constants related to high speed periodic scheduling
 *
 * We have a periodic schedule that is DWC2_HS_SCHEDULE_UFRAMES long.  From a
 * reservation point of view it's assumed that the schedule goes right back to
 * the beginning after the end of the schedule.
 *
 * What does that mean for scheduling things with a long interval?  It means
 * we'll reserve time for them in every possible microframe that they could
 * ever be scheduled in.  ...but we'll still only actually schedule them as
 * often as they were requested.
 *
 * We keep our schedule in a "bitmap" structure.  This simplifies having
 * to keep track of and merge intervals: we just let the bitmap code do most
 * of the heavy lifting.  In a way scheduling is much like memory allocation.
 *
 * We schedule 100us per uframe or 80% of 125us (the maximum amount you're
 * supposed to schedule for periodic transfers).  That's according to spec.
 *
 * Note that though we only schedule 80% of each microframe, the bitmap that we
 * keep the schedule in is tightly packed (AKA it doesn't have 100us worth of
 * space for each uFrame).
 *
 * Requirements:
 * - DWC2_HS_SCHEDULE_UFRAMES must even divide 0x4000 (HFNUM_MAX_FRNUM + 1)
 * - DWC2_HS_SCHEDULE_UFRAMES must be 8 times DWC2_LS_SCHEDULE_FRAMES (probably
 *   could be any multiple of 8 times DWC2_LS_SCHEDULE_FRAMES, but there might
 *   be bugs).  The 8 comes from the USB spec: number of microframes per frame.
 */
#define DWC2_US_PER_UFRAME		125
#define DWC2_HS_PERIODIC_US_PER_UFRAME	100

#define DWC2_HS_SCHEDULE_UFRAMES	8
#define DWC2_HS_SCHEDULE_US		(DWC2_HS_SCHEDULE_UFRAMES * \
					 DWC2_HS_PERIODIC_US_PER_UFRAME)

/*
 * Constants related to low speed scheduling
 *
 * For high speed we schedule every 1us.  For low speed that's a bit overkill,
 * so we make up a unit called a "slice" that's worth 25us.  There are 40
 * slices in a full frame and we can schedule 36 of those (90%) for periodic
 * transfers.
 *
 * Our low speed schedule can be as short as 1 frame or could be longer.  When
 * we only schedule 1 frame it means that we'll need to reserve a time every
 * frame even for things that only transfer very rarely, so something that runs
 * every 2048 frames will get time reserved in every frame.  Our low speed
 * schedule can be longer and we'll be able to handle more overlap, but that
 * will come at increased memory cost and increased time to schedule.
 *
 * Note: one other advantage of a short low speed schedule is that if we mess
 * up and miss scheduling we can jump in and use any of the slots that we
 * happened to reserve.
 *
 * With 25 us per slice and 1 frame in the schedule, we only need 4 bytes for
 * the schedule.  There will be one schedule per TT.
 *
 * Requirements:
 * - DWC2_US_PER_SLICE must evenly divide DWC2_LS_PERIODIC_US_PER_FRAME.
 */
#define DWC2_US_PER_SLICE	25
#define DWC2_SLICES_PER_UFRAME	(DWC2_US_PER_UFRAME / DWC2_US_PER_SLICE)

#define DWC2_ROUND_US_TO_SLICE(us) \
				(DIV_ROUND_UP((us), DWC2_US_PER_SLICE) * \
				 DWC2_US_PER_SLICE)

#define DWC2_LS_PERIODIC_US_PER_FRAME \
				900
#define DWC2_LS_PERIODIC_SLICES_PER_FRAME \
				(DWC2_LS_PERIODIC_US_PER_FRAME / \
				 DWC2_US_PER_SLICE)

#define DWC2_LS_SCHEDULE_FRAMES	1
#define DWC2_LS_SCHEDULE_SLICES	(DWC2_LS_SCHEDULE_FRAMES * \
				 DWC2_LS_PERIODIC_SLICES_PER_FRAME)

/**
 * struct dwc2_hsotg - Holds the state of the driver, including the non-periodic
 * and periodic schedules
 *
 * These are common for both host and peripheral modes:
 *
 * @dev:                The struct device pointer
 * @regs:		Pointer to controller regs
 * @hw_params:          Parameters that were autodetected from the
 *                      hardware registers
 * @params:	Parameters that define how the core should be configured
 * @op_state:           The operational State, during transitions (a_host=>
 *                      a_peripheral and b_device=>b_host) this may not match
 *                      the core, but allows the software to determine
 *                      transitions
 * @dr_mode:            Requested mode of operation, one of following:
 *                      - USB_DR_MODE_PERIPHERAL
 *                      - USB_DR_MODE_HOST
 *                      - USB_DR_MODE_OTG
 * @hcd_enabled:	Host mode sub-driver initialization indicator.
 * @gadget_enabled:	Peripheral mode sub-driver initialization indicator.
 * @ll_hw_enabled:	Status of low-level hardware resources.
 * @hibernated:		True if core is hibernated
 * @frame_number:       Frame number read from the core. For both device
 *			and host modes. The value ranges are from 0
 *			to HFNUM_MAX_FRNUM.
 * @phy:                The otg phy transceiver structure for phy control.
 * @uphy:               The otg phy transceiver structure for old USB phy
 *                      control.
 * @plat:               The platform specific configuration data. This can be
 *                      removed once all SoCs support usb transceiver.
 * @supplies:           Definition of USB power supplies
 * @vbus_supply:        Regulator supplying vbus.
 * @phyif:              PHY interface width
 * @lock:		Spinlock that protects all the driver data structures
 * @priv:		Stores a pointer to the struct usb_hcd
 * @queuing_high_bandwidth: True if multiple packets of a high-bandwidth
 *                      transfer are in process of being queued
 * @srp_success:        Stores status of SRP request in the case of a FS PHY
 *                      with an I2C interface
 * @wq_otg:             Workqueue object used for handling of some interrupts
 * @wf_otg:             Work object for handling Connector ID Status Change
 *                      interrupt
 * @wkp_timer:          Timer object for handling Wakeup Detected interrupt
 * @lx_state:           Lx state of connected device
 * @gr_backup: Backup of global registers during suspend
 * @dr_backup: Backup of device registers during suspend
 * @hr_backup: Backup of host registers during suspend
 *
 * These are for host mode:
 *
 * @flags:              Flags for handling root port state changes
 * @flags.d32:          Contain all root port flags
 * @flags.b:            Separate root port flags from each other
 * @flags.b.port_connect_status_change: True if root port connect status
 *                      changed
 * @flags.b.port_connect_status: True if device connected to root port
 * @flags.b.port_reset_change: True if root port reset status changed
 * @flags.b.port_enable_change: True if root port enable status changed
 * @flags.b.port_suspend_change: True if root port suspend status changed
 * @flags.b.port_over_current_change: True if root port over current state
 *                       changed.
 * @flags.b.port_l1_change: True if root port l1 status changed
 * @flags.b.reserved:   Reserved bits of root port register
 * @non_periodic_sched_inactive: Inactive QHs in the non-periodic schedule.
 *                      Transfers associated with these QHs are not currently
 *                      assigned to a host channel.
 * @non_periodic_sched_active: Active QHs in the non-periodic schedule.
 *                      Transfers associated with these QHs are currently
 *                      assigned to a host channel.
 * @non_periodic_qh_ptr: Pointer to next QH to process in the active
 *                      non-periodic schedule
 * @non_periodic_sched_waiting: Waiting QHs in the non-periodic schedule.
 *                      Transfers associated with these QHs are not currently
 *                      assigned to a host channel.
 * @periodic_sched_inactive: Inactive QHs in the periodic schedule. This is a
 *                      list of QHs for periodic transfers that are _not_
 *                      scheduled for the next frame. Each QH in the list has an
 *                      interval counter that determines when it needs to be
 *                      scheduled for execution. This scheduling mechanism
 *                      allows only a simple calculation for periodic bandwidth
 *                      used (i.e. must assume that all periodic transfers may
 *                      need to execute in the same frame). However, it greatly
 *                      simplifies scheduling and should be sufficient for the
 *                      vast majority of OTG hosts, which need to connect to a
 *                      small number of peripherals at one time. Items move from
 *                      this list to periodic_sched_ready when the QH interval
 *                      counter is 0 at SOF.
 * @periodic_sched_ready:  List of periodic QHs that are ready for execution in
 *                      the next frame, but have not yet been assigned to host
 *                      channels. Items move from this list to
 *                      periodic_sched_assigned as host channels become
 *                      available during the current frame.
 * @periodic_sched_assigned: List of periodic QHs to be executed in the next
 *                      frame that are assigned to host channels. Items move
 *                      from this list to periodic_sched_queued as the
 *                      transactions for the QH are queued to the DWC_otg
 *                      controller.
 * @periodic_sched_queued: List of periodic QHs that have been queued for
 *                      execution. Items move from this list to either
 *                      periodic_sched_inactive or periodic_sched_ready when the
 *                      channel associated with the transfer is released. If the
 *                      interval for the QH is 1, the item moves to
 *                      periodic_sched_ready because it must be rescheduled for
 *                      the next frame. Otherwise, the item moves to
 *                      periodic_sched_inactive.
 * @split_order:        List keeping track of channels doing splits, in order.
 * @periodic_usecs:     Total bandwidth claimed so far for periodic transfers.
 *                      This value is in microseconds per (micro)frame. The
 *                      assumption is that all periodic transfers may occur in
 *                      the same (micro)frame.
 * @hs_periodic_bitmap: Bitmap used by the microframe scheduler any time the
 *                      host is in high speed mode; low speed schedules are
 *                      stored elsewhere since we need one per TT.
 * @periodic_qh_count:  Count of periodic QHs, if using several eps. Used for
 *                      SOF enable/disable.
 * @free_hc_list:       Free host channels in the controller. This is a list of
 *                      struct dwc2_host_chan items.
 * @periodic_channels:  Number of host channels assigned to periodic transfers.
 *                      Currently assuming that there is a dedicated host
 *                      channel for each periodic transaction and at least one
 *                      host channel is available for non-periodic transactions.
 * @non_periodic_channels: Number of host channels assigned to non-periodic
 *                      transfers
 * @available_host_channels: Number of host channels available for the
 *			     microframe scheduler to use
 * @hc_ptr_array:       Array of pointers to the host channel descriptors.
 *                      Allows accessing a host channel descriptor given the
 *                      host channel number. This is useful in interrupt
 *                      handlers.
 * @status_buf:         Buffer used for data received during the status phase of
 *                      a control transfer.
 * @status_buf_dma:     DMA address for status_buf
 * @start_work:         Delayed work for handling host A-cable connection
 * @reset_work:         Delayed work for handling a port reset
 * @otg_port:           OTG port number
 * @frame_list:         Frame list
 * @frame_list_dma:     Frame list DMA address
 * @frame_list_sz:      Frame list size
 * @desc_gen_cache:     Kmem cache for generic descriptors
 * @desc_hsisoc_cache:  Kmem cache for hs isochronous descriptors
 * @unaligned_cache:    Kmem cache for DMA mode to handle non-aligned buf
 *
 * These are for peripheral mode:
 *
 * @driver:             USB gadget driver
 * @dedicated_fifos:    Set if the hardware has dedicated IN-EP fifos.
 * @num_of_eps:         Number of available EPs (excluding EP0)
 * @debug_root:         Root directrory for debugfs.
 * @ep0_reply:          Request used for ep0 reply.
 * @ep0_buff:           Buffer for EP0 reply data, if needed.
 * @ctrl_buff:          Buffer for EP0 control requests.
 * @ctrl_req:           Request for EP0 control packets.
 * @ep0_state:          EP0 control transfers state
 * @test_mode:          USB test mode requested by the host
 * @remote_wakeup_allowed: True if device is allowed to wake-up host by
 *                      remote-wakeup signalling
 * @setup_desc_dma:	EP0 setup stage desc chain DMA address
 * @setup_desc:		EP0 setup stage desc chain pointer
 * @ctrl_in_desc_dma:	EP0 IN data phase desc chain DMA address
 * @ctrl_in_desc:	EP0 IN data phase desc chain pointer
 * @ctrl_out_desc_dma:	EP0 OUT data phase desc chain DMA address
 * @ctrl_out_desc:	EP0 OUT data phase desc chain pointer
 * @irq:		Interrupt request line number
 * @clk:		Pointer to otg clock
 * @reset:		Pointer to dwc2 reset controller
 * @reset_ecc:          Pointer to dwc2 optional reset controller in Stratix10.
 * @regset:		A pointer to a struct debugfs_regset32, which contains
 *			a pointer to an array of register definitions, the
 *			array size and the base address where the register bank
 *			is to be found.
 * @bus_suspended:	True if bus is suspended
 * @last_frame_num:	Number of last frame. Range from 0 to  32768
 * @frame_num_array:    Used only  if CONFIG_USB_DWC2_TRACK_MISSED_SOFS is
 *			defined, for missed SOFs tracking. Array holds that
 *			frame numbers, which not equal to last_frame_num +1
 * @last_frame_num_array:   Used only  if CONFIG_USB_DWC2_TRACK_MISSED_SOFS is
 *			    defined, for missed SOFs tracking.
 *			    If current_frame_number != last_frame_num+1
 *			    then last_frame_num added to this array
 * @frame_num_idx:	Actual size of frame_num_array and last_frame_num_array
 * @dumped_frame_num_array:	1 - if missed SOFs frame numbers dumbed
 *				0 - if missed SOFs frame numbers not dumbed
 * @fifo_mem:			Total internal RAM for FIFOs (bytes)
 * @fifo_map:		Each bit intend for concrete fifo. If that bit is set,
 *			then that fifo is used
 * @gadget:		Represents a usb slave device
 * @connected:		Used in slave mode. True if device connected with host
 * @eps_in:		The IN endpoints being supplied to the gadget framework
 * @eps_out:		The OUT endpoints being supplied to the gadget framework
 * @new_connection:	Used in host mode. True if there are new connected
 *			device
 * @enabled:		Indicates the enabling state of controller
 *
 */
struct dwc2_hsotg {
	struct device *dev;
	void __iomem *regs;
	/** Params detected from hardware */
	struct dwc2_hw_params hw_params;
	/** Params to actually use */
	struct dwc2_core_params params;
	enum usb_otg_state op_state;
	enum usb_dr_mode dr_mode;
	unsigned int hcd_enabled:1;
	unsigned int gadget_enabled:1;
	unsigned int ll_hw_enabled:1;
	unsigned int hibernated:1;
	u16 frame_number;

	struct phy *phy;
	struct usb_phy *uphy;
	struct dwc2_hsotg_plat *plat;
	struct regulator_bulk_data supplies[DWC2_NUM_SUPPLIES];
	struct regulator *vbus_supply;
	u32 phyif;

	spinlock_t lock;
	void *priv;
	int     irq;
	struct clk *clk;
	struct reset_control *reset;
	struct reset_control *reset_ecc;

	unsigned int queuing_high_bandwidth:1;
	unsigned int srp_success:1;

	struct workqueue_struct *wq_otg;
	struct work_struct wf_otg;
	struct timer_list wkp_timer;
	enum dwc2_lx_state lx_state;
	struct dwc2_gregs_backup gr_backup;
	struct dwc2_dregs_backup dr_backup;
	struct dwc2_hregs_backup hr_backup;

	struct dentry *debug_root;
	struct debugfs_regset32 *regset;

	/* DWC OTG HW Release versions */
#define DWC2_CORE_REV_2_71a	0x4f54271a
#define DWC2_CORE_REV_2_72a     0x4f54272a
#define DWC2_CORE_REV_2_80a	0x4f54280a
#define DWC2_CORE_REV_2_90a	0x4f54290a
#define DWC2_CORE_REV_2_91a	0x4f54291a
#define DWC2_CORE_REV_2_92a	0x4f54292a
#define DWC2_CORE_REV_2_94a	0x4f54294a
#define DWC2_CORE_REV_3_00a	0x4f54300a
#define DWC2_CORE_REV_3_10a	0x4f54310a
#define DWC2_CORE_REV_4_00a	0x4f54400a
#define DWC2_FS_IOT_REV_1_00a	0x5531100a
#define DWC2_HS_IOT_REV_1_00a	0x5532100a

	/* DWC OTG HW Core ID */
#define DWC2_OTG_ID		0x4f540000
#define DWC2_FS_IOT_ID		0x55310000
#define DWC2_HS_IOT_ID		0x55320000

#if IS_ENABLED(CONFIG_USB_DWC2_HOST) || IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
	union dwc2_hcd_internal_flags {
		u32 d32;
		struct {
			unsigned port_connect_status_change:1;
			unsigned port_connect_status:1;
			unsigned port_reset_change:1;
			unsigned port_enable_change:1;
			unsigned port_suspend_change:1;
			unsigned port_over_current_change:1;
			unsigned port_l1_change:1;
			unsigned reserved:25;
		} b;
	} flags;

	struct list_head non_periodic_sched_inactive;
	struct list_head non_periodic_sched_waiting;
	struct list_head non_periodic_sched_active;
	struct list_head *non_periodic_qh_ptr;
	struct list_head periodic_sched_inactive;
	struct list_head periodic_sched_ready;
	struct list_head periodic_sched_assigned;
	struct list_head periodic_sched_queued;
	struct list_head split_order;
	u16 periodic_usecs;
	unsigned long hs_periodic_bitmap[
		DIV_ROUND_UP(DWC2_HS_SCHEDULE_US, BITS_PER_LONG)];
	u16 periodic_qh_count;
	bool bus_suspended;
	bool new_connection;

	u16 last_frame_num;

#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
#define FRAME_NUM_ARRAY_SIZE 1000
	u16 *frame_num_array;
	u16 *last_frame_num_array;
	int frame_num_idx;
	int dumped_frame_num_array;
#endif

	struct list_head free_hc_list;
	int periodic_channels;
	int non_periodic_channels;
	int available_host_channels;
	struct dwc2_host_chan *hc_ptr_array[MAX_EPS_CHANNELS];
	u8 *status_buf;
	dma_addr_t status_buf_dma;
#define DWC2_HCD_STATUS_BUF_SIZE 64

	struct delayed_work start_work;
	struct delayed_work reset_work;
	u8 otg_port;
	u32 *frame_list;
	dma_addr_t frame_list_dma;
	u32 frame_list_sz;
	struct kmem_cache *desc_gen_cache;
	struct kmem_cache *desc_hsisoc_cache;
	struct kmem_cache *unaligned_cache;
#define DWC2_KMEM_UNALIGNED_BUF_SIZE 1024

#endif /* CONFIG_USB_DWC2_HOST || CONFIG_USB_DWC2_DUAL_ROLE */

#if IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL) || \
	IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
	/* Gadget structures */
	struct usb_gadget_driver *driver;
	int fifo_mem;
	unsigned int dedicated_fifos:1;
	unsigned char num_of_eps;
	u32 fifo_map;

	struct usb_request *ep0_reply;
	struct usb_request *ctrl_req;
	void *ep0_buff;
	void *ctrl_buff;
	enum dwc2_ep0_state ep0_state;
	u8 test_mode;

	dma_addr_t setup_desc_dma[2];
	struct dwc2_dma_desc *setup_desc[2];
	dma_addr_t ctrl_in_desc_dma;
	struct dwc2_dma_desc *ctrl_in_desc;
	dma_addr_t ctrl_out_desc_dma;
	struct dwc2_dma_desc *ctrl_out_desc;

	struct usb_gadget gadget;
	unsigned int enabled:1;
	unsigned int connected:1;
	unsigned int remote_wakeup_allowed:1;
	struct dwc2_hsotg_ep *eps_in[MAX_EPS_CHANNELS];
	struct dwc2_hsotg_ep *eps_out[MAX_EPS_CHANNELS];
#endif /* CONFIG_USB_DWC2_PERIPHERAL || CONFIG_USB_DWC2_DUAL_ROLE */
};

/* Reasons for halting a host channel */
enum dwc2_halt_status {
	DWC2_HC_XFER_NO_HALT_STATUS,
	DWC2_HC_XFER_COMPLETE,
	DWC2_HC_XFER_URB_COMPLETE,
	DWC2_HC_XFER_ACK,
	DWC2_HC_XFER_NAK,
	DWC2_HC_XFER_NYET,
	DWC2_HC_XFER_STALL,
	DWC2_HC_XFER_XACT_ERR,
	DWC2_HC_XFER_FRAME_OVERRUN,
	DWC2_HC_XFER_BABBLE_ERR,
	DWC2_HC_XFER_DATA_TOGGLE_ERR,
	DWC2_HC_XFER_AHB_ERR,
	DWC2_HC_XFER_PERIODIC_INCOMPLETE,
	DWC2_HC_XFER_URB_DEQUEUE,
};

/* Core version information */
static inline bool dwc2_is_iot(struct dwc2_hsotg *hsotg)
{
	return (hsotg->hw_params.snpsid & 0xfff00000) == 0x55300000;
}

static inline bool dwc2_is_fs_iot(struct dwc2_hsotg *hsotg)
{
	return (hsotg->hw_params.snpsid & 0xffff0000) == 0x55310000;
}

static inline bool dwc2_is_hs_iot(struct dwc2_hsotg *hsotg)
{
	return (hsotg->hw_params.snpsid & 0xffff0000) == 0x55320000;
}

/*
 * The following functions support initialization of the core driver component
 * and the DWC_otg controller
 */
int dwc2_core_reset(struct dwc2_hsotg *hsotg, bool skip_wait);
int dwc2_enter_partial_power_down(struct dwc2_hsotg *hsotg);
int dwc2_exit_partial_power_down(struct dwc2_hsotg *hsotg, bool restore);
int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg, int is_host);
int dwc2_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup,
		int reset, int is_host);

void dwc2_force_mode(struct dwc2_hsotg *hsotg, bool host);
void dwc2_force_dr_mode(struct dwc2_hsotg *hsotg);

bool dwc2_is_controller_alive(struct dwc2_hsotg *hsotg);

/*
 * Common core Functions.
 * The following functions support managing the DWC_otg controller in either
 * device or host mode.
 */
void dwc2_read_packet(struct dwc2_hsotg *hsotg, u8 *dest, u16 bytes);
void dwc2_flush_tx_fifo(struct dwc2_hsotg *hsotg, const int num);
void dwc2_flush_rx_fifo(struct dwc2_hsotg *hsotg);

void dwc2_enable_global_interrupts(struct dwc2_hsotg *hcd);
void dwc2_disable_global_interrupts(struct dwc2_hsotg *hcd);

void dwc2_hib_restore_common(struct dwc2_hsotg *hsotg, int rem_wakeup,
			     int is_host);
int dwc2_backup_global_registers(struct dwc2_hsotg *hsotg);
int dwc2_restore_global_registers(struct dwc2_hsotg *hsotg);

void dwc2_enable_acg(struct dwc2_hsotg *hsotg);

/* This function should be called on every hardware interrupt. */
irqreturn_t dwc2_handle_common_intr(int irq, void *dev);

/* The device ID match table */
extern const struct of_device_id dwc2_of_match_table[];

int dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg);
int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg);

/* Common polling functions */
int dwc2_hsotg_wait_bit_set(struct dwc2_hsotg *hs_otg, u32 reg, u32 bit,
			    u32 timeout);
int dwc2_hsotg_wait_bit_clear(struct dwc2_hsotg *hs_otg, u32 reg, u32 bit,
			      u32 timeout);
/* Parameters */
int dwc2_get_hwparams(struct dwc2_hsotg *hsotg);
int dwc2_init_params(struct dwc2_hsotg *hsotg);

/*
 * The following functions check the controller's OTG operation mode
 * capability (GHWCFG2.OTG_MODE).
 *
 * These functions can be used before the internal hsotg->hw_params
 * are read in and cached so they always read directly from the
 * GHWCFG2 register.
 */
unsigned int dwc2_op_mode(struct dwc2_hsotg *hsotg);
bool dwc2_hw_is_otg(struct dwc2_hsotg *hsotg);
bool dwc2_hw_is_host(struct dwc2_hsotg *hsotg);
bool dwc2_hw_is_device(struct dwc2_hsotg *hsotg);

/*
 * Returns the mode of operation, host or device
 */
static inline int dwc2_is_host_mode(struct dwc2_hsotg *hsotg)
{
	return (dwc2_readl(hsotg->regs + GINTSTS) & GINTSTS_CURMODE_HOST) != 0;
}

static inline int dwc2_is_device_mode(struct dwc2_hsotg *hsotg)
{
	return (dwc2_readl(hsotg->regs + GINTSTS) & GINTSTS_CURMODE_HOST) == 0;
}

/*
 * Dump core registers and SPRAM
 */
void dwc2_dump_dev_registers(struct dwc2_hsotg *hsotg);
void dwc2_dump_host_registers(struct dwc2_hsotg *hsotg);
void dwc2_dump_global_registers(struct dwc2_hsotg *hsotg);

/* Gadget defines */
#if IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL) || \
	IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
int dwc2_hsotg_remove(struct dwc2_hsotg *hsotg);
int dwc2_hsotg_suspend(struct dwc2_hsotg *dwc2);
int dwc2_hsotg_resume(struct dwc2_hsotg *dwc2);
int dwc2_gadget_init(struct dwc2_hsotg *hsotg);
void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2,
				       bool reset);
void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg);
void dwc2_hsotg_disconnect(struct dwc2_hsotg *dwc2);
int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, int testmode);
#define dwc2_is_device_connected(hsotg) (hsotg->connected)
int dwc2_backup_device_registers(struct dwc2_hsotg *hsotg);
int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg, int remote_wakeup);
int dwc2_gadget_enter_hibernation(struct dwc2_hsotg *hsotg);
int dwc2_gadget_exit_hibernation(struct dwc2_hsotg *hsotg,
				 int rem_wakeup, int reset);
int dwc2_hsotg_tx_fifo_count(struct dwc2_hsotg *hsotg);
int dwc2_hsotg_tx_fifo_total_depth(struct dwc2_hsotg *hsotg);
int dwc2_hsotg_tx_fifo_average_depth(struct dwc2_hsotg *hsotg);
void dwc2_gadget_init_lpm(struct dwc2_hsotg *hsotg);
#else
static inline int dwc2_hsotg_remove(struct dwc2_hsotg *dwc2)
{ return 0; }
static inline int dwc2_hsotg_suspend(struct dwc2_hsotg *dwc2)
{ return 0; }
static inline int dwc2_hsotg_resume(struct dwc2_hsotg *dwc2)
{ return 0; }
static inline int dwc2_gadget_init(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2,
						     bool reset) {}
static inline void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg) {}
static inline void dwc2_hsotg_disconnect(struct dwc2_hsotg *dwc2) {}
static inline int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg,
					   int testmode)
{ return 0; }
#define dwc2_is_device_connected(hsotg) (0)
static inline int dwc2_backup_device_registers(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg,
						int remote_wakeup)
{ return 0; }
static inline int dwc2_gadget_enter_hibernation(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline int dwc2_gadget_exit_hibernation(struct dwc2_hsotg *hsotg,
					       int rem_wakeup, int reset)
{ return 0; }
static inline int dwc2_hsotg_tx_fifo_count(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline int dwc2_hsotg_tx_fifo_total_depth(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline int dwc2_hsotg_tx_fifo_average_depth(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline void dwc2_gadget_init_lpm(struct dwc2_hsotg *hsotg) {}
#endif

#if IS_ENABLED(CONFIG_USB_DWC2_HOST) || IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
int dwc2_hcd_get_frame_number(struct dwc2_hsotg *hsotg);
int dwc2_hcd_get_future_frame_number(struct dwc2_hsotg *hsotg, int us);
void dwc2_hcd_connect(struct dwc2_hsotg *hsotg);
void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg, bool force);
void dwc2_hcd_start(struct dwc2_hsotg *hsotg);
int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup);
int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg);
int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg);
int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg);
int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg,
			       int rem_wakeup, int reset);
#else
static inline int dwc2_hcd_get_frame_number(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline int dwc2_hcd_get_future_frame_number(struct dwc2_hsotg *hsotg,
						   int us)
{ return 0; }
static inline void dwc2_hcd_connect(struct dwc2_hsotg *hsotg) {}
static inline void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg, bool force) {}
static inline void dwc2_hcd_start(struct dwc2_hsotg *hsotg) {}
static inline void dwc2_hcd_remove(struct dwc2_hsotg *hsotg) {}
static inline int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup)
{ return 0; }
static inline int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg)
{ return 0; }
static inline int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg,
					     int rem_wakeup, int reset)
{ return 0; }

#endif

#endif /* __DWC2_CORE_H__ */