summaryrefslogtreecommitdiff
path: root/drivers/usb/dwc3/gadget.c
blob: 28f49400f3e8b178e23c881120577da461178c35 (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
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
// SPDX-License-Identifier: GPL-2.0
/*
 * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/dma-mapping.h>

#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

#include "debug.h"
#include "core.h"
#include "gadget.h"
#include "io.h"

#define DWC3_ALIGN_FRAME(d, n)	(((d)->frame_number + ((d)->interval * (n))) \
					& ~((d)->interval - 1))

/**
 * dwc3_gadget_set_test_mode - enables usb2 test modes
 * @dwc: pointer to our context structure
 * @mode: the mode to set (J, K SE0 NAK, Force Enable)
 *
 * Caller should take care of locking. This function will return 0 on
 * success or -EINVAL if wrong Test Selector is passed.
 */
int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
{
	u32		reg;

	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
	reg &= ~DWC3_DCTL_TSTCTRL_MASK;

	switch (mode) {
	case USB_TEST_J:
	case USB_TEST_K:
	case USB_TEST_SE0_NAK:
	case USB_TEST_PACKET:
	case USB_TEST_FORCE_ENABLE:
		reg |= mode << 1;
		break;
	default:
		return -EINVAL;
	}

	dwc3_gadget_dctl_write_safe(dwc, reg);

	return 0;
}

/**
 * dwc3_gadget_get_link_state - gets current state of usb link
 * @dwc: pointer to our context structure
 *
 * Caller should take care of locking. This function will
 * return the link state on success (>= 0) or -ETIMEDOUT.
 */
int dwc3_gadget_get_link_state(struct dwc3 *dwc)
{
	u32		reg;

	reg = dwc3_readl(dwc->regs, DWC3_DSTS);

	return DWC3_DSTS_USBLNKST(reg);
}

/**
 * dwc3_gadget_set_link_state - sets usb link to a particular state
 * @dwc: pointer to our context structure
 * @state: the state to put link into
 *
 * Caller should take care of locking. This function will
 * return 0 on success or -ETIMEDOUT.
 */
int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
{
	int		retries = 10000;
	u32		reg;

	/*
	 * Wait until device controller is ready. Only applies to 1.94a and
	 * later RTL.
	 */
	if (!DWC3_VER_IS_PRIOR(DWC3, 194A)) {
		while (--retries) {
			reg = dwc3_readl(dwc->regs, DWC3_DSTS);
			if (reg & DWC3_DSTS_DCNRD)
				udelay(5);
			else
				break;
		}

		if (retries <= 0)
			return -ETIMEDOUT;
	}

	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
	reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;

	/* set no action before sending new link state change */
	dwc3_writel(dwc->regs, DWC3_DCTL, reg);

	/* set requested state */
	reg |= DWC3_DCTL_ULSTCHNGREQ(state);
	dwc3_writel(dwc->regs, DWC3_DCTL, reg);

	/*
	 * The following code is racy when called from dwc3_gadget_wakeup,
	 * and is not needed, at least on newer versions
	 */
	if (!DWC3_VER_IS_PRIOR(DWC3, 194A))
		return 0;

	/* wait for a change in DSTS */
	retries = 10000;
	while (--retries) {
		reg = dwc3_readl(dwc->regs, DWC3_DSTS);

		if (DWC3_DSTS_USBLNKST(reg) == state)
			return 0;

		udelay(5);
	}

	return -ETIMEDOUT;
}

static void dwc3_ep0_reset_state(struct dwc3 *dwc)
{
	unsigned int	dir;

	if (dwc->ep0state != EP0_SETUP_PHASE) {
		dir = !!dwc->ep0_expect_in;
		if (dwc->ep0state == EP0_DATA_PHASE)
			dwc3_ep0_end_control_data(dwc, dwc->eps[dir]);
		else
			dwc3_ep0_end_control_data(dwc, dwc->eps[!dir]);

		dwc->eps[0]->trb_enqueue = 0;
		dwc->eps[1]->trb_enqueue = 0;

		dwc3_ep0_stall_and_restart(dwc);
	}
}

/**
 * dwc3_ep_inc_trb - increment a trb index.
 * @index: Pointer to the TRB index to increment.
 *
 * The index should never point to the link TRB. After incrementing,
 * if it is point to the link TRB, wrap around to the beginning. The
 * link TRB is always at the last TRB entry.
 */
static void dwc3_ep_inc_trb(u8 *index)
{
	(*index)++;
	if (*index == (DWC3_TRB_NUM - 1))
		*index = 0;
}

/**
 * dwc3_ep_inc_enq - increment endpoint's enqueue pointer
 * @dep: The endpoint whose enqueue pointer we're incrementing
 */
static void dwc3_ep_inc_enq(struct dwc3_ep *dep)
{
	dwc3_ep_inc_trb(&dep->trb_enqueue);
}

/**
 * dwc3_ep_inc_deq - increment endpoint's dequeue pointer
 * @dep: The endpoint whose enqueue pointer we're incrementing
 */
static void dwc3_ep_inc_deq(struct dwc3_ep *dep)
{
	dwc3_ep_inc_trb(&dep->trb_dequeue);
}

static void dwc3_gadget_del_and_unmap_request(struct dwc3_ep *dep,
		struct dwc3_request *req, int status)
{
	struct dwc3			*dwc = dep->dwc;

	list_del(&req->list);
	req->remaining = 0;
	req->needs_extra_trb = false;
	req->num_trbs = 0;

	if (req->request.status == -EINPROGRESS)
		req->request.status = status;

	if (req->trb)
		usb_gadget_unmap_request_by_dev(dwc->sysdev,
				&req->request, req->direction);

	req->trb = NULL;
	trace_dwc3_gadget_giveback(req);

	if (dep->number > 1)
		pm_runtime_put(dwc->dev);
}

/**
 * dwc3_gadget_giveback - call struct usb_request's ->complete callback
 * @dep: The endpoint to whom the request belongs to
 * @req: The request we're giving back
 * @status: completion code for the request
 *
 * Must be called with controller's lock held and interrupts disabled. This
 * function will unmap @req and call its ->complete() callback to notify upper
 * layers that it has completed.
 */
void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
		int status)
{
	struct dwc3			*dwc = dep->dwc;

	dwc3_gadget_del_and_unmap_request(dep, req, status);
	req->status = DWC3_REQUEST_STATUS_COMPLETED;

	spin_unlock(&dwc->lock);
	usb_gadget_giveback_request(&dep->endpoint, &req->request);
	spin_lock(&dwc->lock);
}

/**
 * dwc3_send_gadget_generic_command - issue a generic command for the controller
 * @dwc: pointer to the controller context
 * @cmd: the command to be issued
 * @param: command parameter
 *
 * Caller should take care of locking. Issue @cmd with a given @param to @dwc
 * and wait for its completion.
 */
int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned int cmd,
		u32 param)
{
	u32		timeout = 500;
	int		status = 0;
	int		ret = 0;
	u32		reg;

	dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
	dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);

	do {
		reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
		if (!(reg & DWC3_DGCMD_CMDACT)) {
			status = DWC3_DGCMD_STATUS(reg);
			if (status)
				ret = -EINVAL;
			break;
		}
	} while (--timeout);

	if (!timeout) {
		ret = -ETIMEDOUT;
		status = -ETIMEDOUT;
	}

	trace_dwc3_gadget_generic_cmd(cmd, param, status);

	return ret;
}

static int __dwc3_gadget_wakeup(struct dwc3 *dwc, bool async);

/**
 * dwc3_send_gadget_ep_cmd - issue an endpoint command
 * @dep: the endpoint to which the command is going to be issued
 * @cmd: the command to be issued
 * @params: parameters to the command
 *
 * Caller should handle locking. This function will issue @cmd with given
 * @params to @dep and wait for its completion.
 */
int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd,
		struct dwc3_gadget_ep_cmd_params *params)
{
	const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
	struct dwc3		*dwc = dep->dwc;
	u32			timeout = 5000;
	u32			saved_config = 0;
	u32			reg;

	int			cmd_status = 0;
	int			ret = -EINVAL;

	/*
	 * When operating in USB 2.0 speeds (HS/FS), if GUSB2PHYCFG.ENBLSLPM or
	 * GUSB2PHYCFG.SUSPHY is set, it must be cleared before issuing an
	 * endpoint command.
	 *
	 * Save and clear both GUSB2PHYCFG.ENBLSLPM and GUSB2PHYCFG.SUSPHY
	 * settings. Restore them after the command is completed.
	 *
	 * DWC_usb3 3.30a and DWC_usb31 1.90a programming guide section 3.2.2
	 */
	if (dwc->gadget->speed <= USB_SPEED_HIGH ||
	    DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_ENDTRANSFER) {
		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
		if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
			saved_config |= DWC3_GUSB2PHYCFG_SUSPHY;
			reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
		}

		if (reg & DWC3_GUSB2PHYCFG_ENBLSLPM) {
			saved_config |= DWC3_GUSB2PHYCFG_ENBLSLPM;
			reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
		}

		if (saved_config)
			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
	}

	if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
		int link_state;

		/*
		 * Initiate remote wakeup if the link state is in U3 when
		 * operating in SS/SSP or L1/L2 when operating in HS/FS. If the
		 * link state is in U1/U2, no remote wakeup is needed. The Start
		 * Transfer command will initiate the link recovery.
		 */
		link_state = dwc3_gadget_get_link_state(dwc);
		switch (link_state) {
		case DWC3_LINK_STATE_U2:
			if (dwc->gadget->speed >= USB_SPEED_SUPER)
				break;

			fallthrough;
		case DWC3_LINK_STATE_U3:
			ret = __dwc3_gadget_wakeup(dwc, false);
			dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
					ret);
			break;
		}
	}

	/*
	 * For some commands such as Update Transfer command, DEPCMDPARn
	 * registers are reserved. Since the driver often sends Update Transfer
	 * command, don't write to DEPCMDPARn to avoid register write delays and
	 * improve performance.
	 */
	if (DWC3_DEPCMD_CMD(cmd) != DWC3_DEPCMD_UPDATETRANSFER) {
		dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
		dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
		dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
	}

	/*
	 * Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're
	 * not relying on XferNotReady, we can make use of a special "No
	 * Response Update Transfer" command where we should clear both CmdAct
	 * and CmdIOC bits.
	 *
	 * With this, we don't need to wait for command completion and can
	 * straight away issue further commands to the endpoint.
	 *
	 * NOTICE: We're making an assumption that control endpoints will never
	 * make use of Update Transfer command. This is a safe assumption
	 * because we can never have more than one request at a time with
	 * Control Endpoints. If anybody changes that assumption, this chunk
	 * needs to be updated accordingly.
	 */
	if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER &&
			!usb_endpoint_xfer_isoc(desc))
		cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT);
	else
		cmd |= DWC3_DEPCMD_CMDACT;

	dwc3_writel(dep->regs, DWC3_DEPCMD, cmd);

	if (!(cmd & DWC3_DEPCMD_CMDACT) ||
		(DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_ENDTRANSFER &&
		!(cmd & DWC3_DEPCMD_CMDIOC))) {
		ret = 0;
		goto skip_status;
	}

	do {
		reg = dwc3_readl(dep->regs, DWC3_DEPCMD);
		if (!(reg & DWC3_DEPCMD_CMDACT)) {
			cmd_status = DWC3_DEPCMD_STATUS(reg);

			switch (cmd_status) {
			case 0:
				ret = 0;
				break;
			case DEPEVT_TRANSFER_NO_RESOURCE:
				dev_WARN(dwc->dev, "No resource for %s\n",
					 dep->name);
				ret = -EINVAL;
				break;
			case DEPEVT_TRANSFER_BUS_EXPIRY:
				/*
				 * SW issues START TRANSFER command to
				 * isochronous ep with future frame interval. If
				 * future interval time has already passed when
				 * core receives the command, it will respond
				 * with an error status of 'Bus Expiry'.
				 *
				 * Instead of always returning -EINVAL, let's
				 * give a hint to the gadget driver that this is
				 * the case by returning -EAGAIN.
				 */
				ret = -EAGAIN;
				break;
			default:
				dev_WARN(dwc->dev, "UNKNOWN cmd status\n");
			}

			break;
		}
	} while (--timeout);

	if (timeout == 0) {
		ret = -ETIMEDOUT;
		cmd_status = -ETIMEDOUT;
	}

skip_status:
	trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);

	if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
		if (ret == 0)
			dep->flags |= DWC3_EP_TRANSFER_STARTED;

		if (ret != -ETIMEDOUT)
			dwc3_gadget_ep_get_transfer_index(dep);
	}

	if (saved_config) {
		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
		reg |= saved_config;
		dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
	}

	return ret;
}

static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
{
	struct dwc3 *dwc = dep->dwc;
	struct dwc3_gadget_ep_cmd_params params;
	u32 cmd = DWC3_DEPCMD_CLEARSTALL;

	/*
	 * As of core revision 2.60a the recommended programming model
	 * is to set the ClearPendIN bit when issuing a Clear Stall EP
	 * command for IN endpoints. This is to prevent an issue where
	 * some (non-compliant) hosts may not send ACK TPs for pending
	 * IN transfers due to a mishandled error condition. Synopsys
	 * STAR 9000614252.
	 */
	if (dep->direction &&
	    !DWC3_VER_IS_PRIOR(DWC3, 260A) &&
	    (dwc->gadget->speed >= USB_SPEED_SUPER))
		cmd |= DWC3_DEPCMD_CLEARPENDIN;

	memset(&params, 0, sizeof(params));

	return dwc3_send_gadget_ep_cmd(dep, cmd, &params);
}

static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
		struct dwc3_trb *trb)
{
	u32		offset = (char *) trb - (char *) dep->trb_pool;

	return dep->trb_pool_dma + offset;
}

static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
{
	struct dwc3		*dwc = dep->dwc;

	if (dep->trb_pool)
		return 0;

	dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
			sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
			&dep->trb_pool_dma, GFP_KERNEL);
	if (!dep->trb_pool) {
		dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
				dep->name);
		return -ENOMEM;
	}

	return 0;
}

static void dwc3_free_trb_pool(struct dwc3_ep *dep)
{
	struct dwc3		*dwc = dep->dwc;

	dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
			dep->trb_pool, dep->trb_pool_dma);

	dep->trb_pool = NULL;
	dep->trb_pool_dma = 0;
}

static int dwc3_gadget_set_xfer_resource(struct dwc3_ep *dep)
{
	struct dwc3_gadget_ep_cmd_params params;

	memset(&params, 0x00, sizeof(params));

	params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);

	return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE,
			&params);
}

/**
 * dwc3_gadget_start_config - configure ep resources
 * @dep: endpoint that is being enabled
 *
 * Issue a %DWC3_DEPCMD_DEPSTARTCFG command to @dep. After the command's
 * completion, it will set Transfer Resource for all available endpoints.
 *
 * The assignment of transfer resources cannot perfectly follow the data book
 * due to the fact that the controller driver does not have all knowledge of the
 * configuration in advance. It is given this information piecemeal by the
 * composite gadget framework after every SET_CONFIGURATION and
 * SET_INTERFACE. Trying to follow the databook programming model in this
 * scenario can cause errors. For two reasons:
 *
 * 1) The databook says to do %DWC3_DEPCMD_DEPSTARTCFG for every
 * %USB_REQ_SET_CONFIGURATION and %USB_REQ_SET_INTERFACE (8.1.5). This is
 * incorrect in the scenario of multiple interfaces.
 *
 * 2) The databook does not mention doing more %DWC3_DEPCMD_DEPXFERCFG for new
 * endpoint on alt setting (8.1.6).
 *
 * The following simplified method is used instead:
 *
 * All hardware endpoints can be assigned a transfer resource and this setting
 * will stay persistent until either a core reset or hibernation. So whenever we
 * do a %DWC3_DEPCMD_DEPSTARTCFG(0) we can go ahead and do
 * %DWC3_DEPCMD_DEPXFERCFG for every hardware endpoint as well. We are
 * guaranteed that there are as many transfer resources as endpoints.
 *
 * This function is called for each endpoint when it is being enabled but is
 * triggered only when called for EP0-out, which always happens first, and which
 * should only happen in one of the above conditions.
 */
static int dwc3_gadget_start_config(struct dwc3_ep *dep)
{
	struct dwc3_gadget_ep_cmd_params params;
	struct dwc3		*dwc;
	u32			cmd;
	int			i;
	int			ret;

	if (dep->number)
		return 0;

	memset(&params, 0x00, sizeof(params));
	cmd = DWC3_DEPCMD_DEPSTARTCFG;
	dwc = dep->dwc;

	ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
	if (ret)
		return ret;

	for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
		struct dwc3_ep *dep = dwc->eps[i];

		if (!dep)
			continue;

		ret = dwc3_gadget_set_xfer_resource(dep);
		if (ret)
			return ret;
	}

	return 0;
}

static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action)
{
	const struct usb_ss_ep_comp_descriptor *comp_desc;
	const struct usb_endpoint_descriptor *desc;
	struct dwc3_gadget_ep_cmd_params params;
	struct dwc3 *dwc = dep->dwc;

	comp_desc = dep->endpoint.comp_desc;
	desc = dep->endpoint.desc;

	memset(&params, 0x00, sizeof(params));

	params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
		| DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));

	/* Burst size is only needed in SuperSpeed mode */
	if (dwc->gadget->speed >= USB_SPEED_SUPER) {
		u32 burst = dep->endpoint.maxburst;

		params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1);
	}

	params.param0 |= action;
	if (action == DWC3_DEPCFG_ACTION_RESTORE)
		params.param2 |= dep->saved_state;

	if (usb_endpoint_xfer_control(desc))
		params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN;

	if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc))
		params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN;

	if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
		params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
			| DWC3_DEPCFG_XFER_COMPLETE_EN
			| DWC3_DEPCFG_STREAM_EVENT_EN;
		dep->stream_capable = true;
	}

	if (!usb_endpoint_xfer_control(desc))
		params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;

	/*
	 * We are doing 1:1 mapping for endpoints, meaning
	 * Physical Endpoints 2 maps to Logical Endpoint 2 and
	 * so on. We consider the direction bit as part of the physical
	 * endpoint number. So USB endpoint 0x81 is 0x03.
	 */
	params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);

	/*
	 * We must use the lower 16 TX FIFOs even though
	 * HW might have more
	 */
	if (dep->direction)
		params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);

	if (desc->bInterval) {
		u8 bInterval_m1;

		/*
		 * Valid range for DEPCFG.bInterval_m1 is from 0 to 13.
		 *
		 * NOTE: The programming guide incorrectly stated bInterval_m1
		 * must be set to 0 when operating in fullspeed. Internally the
		 * controller does not have this limitation. See DWC_usb3x
		 * programming guide section 3.2.2.1.
		 */
		bInterval_m1 = min_t(u8, desc->bInterval - 1, 13);

		if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
		    dwc->gadget->speed == USB_SPEED_FULL)
			dep->interval = desc->bInterval;
		else
			dep->interval = 1 << (desc->bInterval - 1);

		params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(bInterval_m1);
	}

	return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, &params);
}

/**
 * dwc3_gadget_calc_tx_fifo_size - calculates the txfifo size value
 * @dwc: pointer to the DWC3 context
 * @mult: multiplier to be used when calculating the fifo_size
 *
 * Calculates the size value based on the equation below:
 *
 * DWC3 revision 280A and prior:
 * fifo_size = mult * (max_packet / mdwidth) + 1;
 *
 * DWC3 revision 290A and onwards:
 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
 *
 * The max packet size is set to 1024, as the txfifo requirements mainly apply
 * to super speed USB use cases.  However, it is safe to overestimate the fifo
 * allocations for other scenarios, i.e. high speed USB.
 */
static int dwc3_gadget_calc_tx_fifo_size(struct dwc3 *dwc, int mult)
{
	int max_packet = 1024;
	int fifo_size;
	int mdwidth;

	mdwidth = dwc3_mdwidth(dwc);

	/* MDWIDTH is represented in bits, we need it in bytes */
	mdwidth >>= 3;

	if (DWC3_VER_IS_PRIOR(DWC3, 290A))
		fifo_size = mult * (max_packet / mdwidth) + 1;
	else
		fifo_size = mult * ((max_packet + mdwidth) / mdwidth) + 1;
	return fifo_size;
}

/**
 * dwc3_gadget_clear_tx_fifos - Clears txfifo allocation
 * @dwc: pointer to the DWC3 context
 *
 * Iterates through all the endpoint registers and clears the previous txfifo
 * allocations.
 */
void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc)
{
	struct dwc3_ep *dep;
	int fifo_depth;
	int size;
	int num;

	if (!dwc->do_fifo_resize)
		return;

	/* Read ep0IN related TXFIFO size */
	dep = dwc->eps[1];
	size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0));
	if (DWC3_IP_IS(DWC3))
		fifo_depth = DWC3_GTXFIFOSIZ_TXFDEP(size);
	else
		fifo_depth = DWC31_GTXFIFOSIZ_TXFDEP(size);

	dwc->last_fifo_depth = fifo_depth;
	/* Clear existing TXFIFO for all IN eps except ep0 */
	for (num = 3; num < min_t(int, dwc->num_eps, DWC3_ENDPOINTS_NUM);
	     num += 2) {
		dep = dwc->eps[num];
		/* Don't change TXFRAMNUM on usb31 version */
		size = DWC3_IP_IS(DWC3) ? 0 :
			dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1)) &
				   DWC31_GTXFIFOSIZ_TXFRAMNUM;

		dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1), size);
		dep->flags &= ~DWC3_EP_TXFIFO_RESIZED;
	}
	dwc->num_ep_resized = 0;
}

/*
 * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
 * @dwc: pointer to our context structure
 *
 * This function will a best effort FIFO allocation in order
 * to improve FIFO usage and throughput, while still allowing
 * us to enable as many endpoints as possible.
 *
 * Keep in mind that this operation will be highly dependent
 * on the configured size for RAM1 - which contains TxFifo -,
 * the amount of endpoints enabled on coreConsultant tool, and
 * the width of the Master Bus.
 *
 * In general, FIFO depths are represented with the following equation:
 *
 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
 *
 * In conjunction with dwc3_gadget_check_config(), this resizing logic will
 * ensure that all endpoints will have enough internal memory for one max
 * packet per endpoint.
 */
static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
{
	struct dwc3 *dwc = dep->dwc;
	int fifo_0_start;
	int ram1_depth;
	int fifo_size;
	int min_depth;
	int num_in_ep;
	int remaining;
	int num_fifos = 1;
	int fifo;
	int tmp;

	if (!dwc->do_fifo_resize)
		return 0;

	/* resize IN endpoints except ep0 */
	if (!usb_endpoint_dir_in(dep->endpoint.desc) || dep->number <= 1)
		return 0;

	/* bail if already resized */
	if (dep->flags & DWC3_EP_TXFIFO_RESIZED)
		return 0;

	ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);

	if ((dep->endpoint.maxburst > 1 &&
	     usb_endpoint_xfer_bulk(dep->endpoint.desc)) ||
	    usb_endpoint_xfer_isoc(dep->endpoint.desc))
		num_fifos = 3;

	if (dep->endpoint.maxburst > 6 &&
	    (usb_endpoint_xfer_bulk(dep->endpoint.desc) ||
	     usb_endpoint_xfer_isoc(dep->endpoint.desc)) && DWC3_IP_IS(DWC31))
		num_fifos = dwc->tx_fifo_resize_max_num;

	/* FIFO size for a single buffer */
	fifo = dwc3_gadget_calc_tx_fifo_size(dwc, 1);

	/* Calculate the number of remaining EPs w/o any FIFO */
	num_in_ep = dwc->max_cfg_eps;
	num_in_ep -= dwc->num_ep_resized;

	/* Reserve at least one FIFO for the number of IN EPs */
	min_depth = num_in_ep * (fifo + 1);
	remaining = ram1_depth - min_depth - dwc->last_fifo_depth;
	remaining = max_t(int, 0, remaining);
	/*
	 * We've already reserved 1 FIFO per EP, so check what we can fit in
	 * addition to it.  If there is not enough remaining space, allocate
	 * all the remaining space to the EP.
	 */
	fifo_size = (num_fifos - 1) * fifo;
	if (remaining < fifo_size)
		fifo_size = remaining;

	fifo_size += fifo;
	/* Last increment according to the TX FIFO size equation */
	fifo_size++;

	/* Check if TXFIFOs start at non-zero addr */
	tmp = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0));
	fifo_0_start = DWC3_GTXFIFOSIZ_TXFSTADDR(tmp);

	fifo_size |= (fifo_0_start + (dwc->last_fifo_depth << 16));
	if (DWC3_IP_IS(DWC3))
		dwc->last_fifo_depth += DWC3_GTXFIFOSIZ_TXFDEP(fifo_size);
	else
		dwc->last_fifo_depth += DWC31_GTXFIFOSIZ_TXFDEP(fifo_size);

	/* Check fifo size allocation doesn't exceed available RAM size. */
	if (dwc->last_fifo_depth >= ram1_depth) {
		dev_err(dwc->dev, "Fifosize(%d) > RAM size(%d) %s depth:%d\n",
			dwc->last_fifo_depth, ram1_depth,
			dep->endpoint.name, fifo_size);
		if (DWC3_IP_IS(DWC3))
			fifo_size = DWC3_GTXFIFOSIZ_TXFDEP(fifo_size);
		else
			fifo_size = DWC31_GTXFIFOSIZ_TXFDEP(fifo_size);

		dwc->last_fifo_depth -= fifo_size;
		return -ENOMEM;
	}

	dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1), fifo_size);
	dep->flags |= DWC3_EP_TXFIFO_RESIZED;
	dwc->num_ep_resized++;

	return 0;
}

/**
 * __dwc3_gadget_ep_enable - initializes a hw endpoint
 * @dep: endpoint to be initialized
 * @action: one of INIT, MODIFY or RESTORE
 *
 * Caller should take care of locking. Execute all necessary commands to
 * initialize a HW endpoint so it can be used by a gadget driver.
 */
static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
{
	const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
	struct dwc3		*dwc = dep->dwc;

	u32			reg;
	int			ret;

	if (!(dep->flags & DWC3_EP_ENABLED)) {
		ret = dwc3_gadget_resize_tx_fifos(dep);
		if (ret)
			return ret;

		ret = dwc3_gadget_start_config(dep);
		if (ret)
			return ret;
	}

	ret = dwc3_gadget_set_ep_config(dep, action);
	if (ret)
		return ret;

	if (!(dep->flags & DWC3_EP_ENABLED)) {
		struct dwc3_trb	*trb_st_hw;
		struct dwc3_trb	*trb_link;

		dep->type = usb_endpoint_type(desc);
		dep->flags |= DWC3_EP_ENABLED;

		reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
		reg |= DWC3_DALEPENA_EP(dep->number);
		dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);

		dep->trb_dequeue = 0;
		dep->trb_enqueue = 0;

		if (usb_endpoint_xfer_control(desc))
			goto out;

		/* Initialize the TRB ring */
		memset(dep->trb_pool, 0,
		       sizeof(struct dwc3_trb) * DWC3_TRB_NUM);

		/* Link TRB. The HWO bit is never reset */
		trb_st_hw = &dep->trb_pool[0];

		trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
		trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
		trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
		trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
		trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
	}

	/*
	 * Issue StartTransfer here with no-op TRB so we can always rely on No
	 * Response Update Transfer command.
	 */
	if (usb_endpoint_xfer_bulk(desc) ||
			usb_endpoint_xfer_int(desc)) {
		struct dwc3_gadget_ep_cmd_params params;
		struct dwc3_trb	*trb;
		dma_addr_t trb_dma;
		u32 cmd;

		memset(&params, 0, sizeof(params));
		trb = &dep->trb_pool[0];
		trb_dma = dwc3_trb_dma_offset(dep, trb);

		params.param0 = upper_32_bits(trb_dma);
		params.param1 = lower_32_bits(trb_dma);

		cmd = DWC3_DEPCMD_STARTTRANSFER;

		ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
		if (ret < 0)
			return ret;

		if (dep->stream_capable) {
			/*
			 * For streams, at start, there maybe a race where the
			 * host primes the endpoint before the function driver
			 * queues a request to initiate a stream. In that case,
			 * the controller will not see the prime to generate the
			 * ERDY and start stream. To workaround this, issue a
			 * no-op TRB as normal, but end it immediately. As a
			 * result, when the function driver queues the request,
			 * the next START_TRANSFER command will cause the
			 * controller to generate an ERDY to initiate the
			 * stream.
			 */
			dwc3_stop_active_transfer(dep, true, true);

			/*
			 * All stream eps will reinitiate stream on NoStream
			 * rejection until we can determine that the host can
			 * prime after the first transfer.
			 *
			 * However, if the controller is capable of
			 * TXF_FLUSH_BYPASS, then IN direction endpoints will
			 * automatically restart the stream without the driver
			 * initiation.
			 */
			if (!dep->direction ||
			    !(dwc->hwparams.hwparams9 &
			      DWC3_GHWPARAMS9_DEV_TXF_FLUSH_BYPASS))
				dep->flags |= DWC3_EP_FORCE_RESTART_STREAM;
		}
	}

out:
	trace_dwc3_gadget_ep_enable(dep);

	return 0;
}

void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep, int status)
{
	struct dwc3_request		*req;

	dwc3_stop_active_transfer(dep, true, false);

	/* If endxfer is delayed, avoid unmapping requests */
	if (dep->flags & DWC3_EP_DELAY_STOP)
		return;

	/* - giveback all requests to gadget driver */
	while (!list_empty(&dep->started_list)) {
		req = next_request(&dep->started_list);

		dwc3_gadget_giveback(dep, req, status);
	}

	while (!list_empty(&dep->pending_list)) {
		req = next_request(&dep->pending_list);

		dwc3_gadget_giveback(dep, req, status);
	}

	while (!list_empty(&dep->cancelled_list)) {
		req = next_request(&dep->cancelled_list);

		dwc3_gadget_giveback(dep, req, status);
	}
}

/**
 * __dwc3_gadget_ep_disable - disables a hw endpoint
 * @dep: the endpoint to disable
 *
 * This function undoes what __dwc3_gadget_ep_enable did and also removes
 * requests which are currently being processed by the hardware and those which
 * are not yet scheduled.
 *
 * Caller should take care of locking.
 */
static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
{
	struct dwc3		*dwc = dep->dwc;
	u32			reg;
	u32			mask;

	trace_dwc3_gadget_ep_disable(dep);

	/* make sure HW endpoint isn't stalled */
	if (dep->flags & DWC3_EP_STALL)
		__dwc3_gadget_ep_set_halt(dep, 0, false);

	reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
	reg &= ~DWC3_DALEPENA_EP(dep->number);
	dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);

	dwc3_remove_requests(dwc, dep, -ESHUTDOWN);

	dep->stream_capable = false;
	dep->type = 0;
	mask = DWC3_EP_TXFIFO_RESIZED;
	/*
	 * dwc3_remove_requests() can exit early if DWC3 EP delayed stop is
	 * set.  Do not clear DEP flags, so that the end transfer command will
	 * be reattempted during the next SETUP stage.
	 */
	if (dep->flags & DWC3_EP_DELAY_STOP)
		mask |= (DWC3_EP_DELAY_STOP | DWC3_EP_TRANSFER_STARTED);
	dep->flags &= mask;

	/* Clear out the ep descriptors for non-ep0 */
	if (dep->number > 1) {
		dep->endpoint.comp_desc = NULL;
		dep->endpoint.desc = NULL;
	}

	return 0;
}

/* -------------------------------------------------------------------------- */

static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
		const struct usb_endpoint_descriptor *desc)
{
	return -EINVAL;
}

static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
{
	return -EINVAL;
}

/* -------------------------------------------------------------------------- */

static int dwc3_gadget_ep_enable(struct usb_ep *ep,
		const struct usb_endpoint_descriptor *desc)
{
	struct dwc3_ep			*dep;
	struct dwc3			*dwc;
	unsigned long			flags;
	int				ret;

	if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
		pr_debug("dwc3: invalid parameters\n");
		return -EINVAL;
	}

	if (!desc->wMaxPacketSize) {
		pr_debug("dwc3: missing wMaxPacketSize\n");
		return -EINVAL;
	}

	dep = to_dwc3_ep(ep);
	dwc = dep->dwc;

	if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
					"%s is already enabled\n",
					dep->name))
		return 0;

	spin_lock_irqsave(&dwc->lock, flags);
	ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return ret;
}

static int dwc3_gadget_ep_disable(struct usb_ep *ep)
{
	struct dwc3_ep			*dep;
	struct dwc3			*dwc;
	unsigned long			flags;
	int				ret;

	if (!ep) {
		pr_debug("dwc3: invalid parameters\n");
		return -EINVAL;
	}

	dep = to_dwc3_ep(ep);
	dwc = dep->dwc;

	if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
					"%s is already disabled\n",
					dep->name))
		return 0;

	spin_lock_irqsave(&dwc->lock, flags);
	ret = __dwc3_gadget_ep_disable(dep);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return ret;
}

static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
		gfp_t gfp_flags)
{
	struct dwc3_request		*req;
	struct dwc3_ep			*dep = to_dwc3_ep(ep);

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

	req->direction	= dep->direction;
	req->epnum	= dep->number;
	req->dep	= dep;
	req->status	= DWC3_REQUEST_STATUS_UNKNOWN;

	trace_dwc3_alloc_request(req);

	return &req->request;
}

static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
		struct usb_request *request)
{
	struct dwc3_request		*req = to_dwc3_request(request);

	trace_dwc3_free_request(req);
	kfree(req);
}

/**
 * dwc3_ep_prev_trb - returns the previous TRB in the ring
 * @dep: The endpoint with the TRB ring
 * @index: The index of the current TRB in the ring
 *
 * Returns the TRB prior to the one pointed to by the index. If the
 * index is 0, we will wrap backwards, skip the link TRB, and return
 * the one just before that.
 */
static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
{
	u8 tmp = index;

	if (!tmp)
		tmp = DWC3_TRB_NUM - 1;

	return &dep->trb_pool[tmp - 1];
}

static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
{
	u8			trbs_left;

	/*
	 * If the enqueue & dequeue are equal then the TRB ring is either full
	 * or empty. It's considered full when there are DWC3_TRB_NUM-1 of TRBs
	 * pending to be processed by the driver.
	 */
	if (dep->trb_enqueue == dep->trb_dequeue) {
		/*
		 * If there is any request remained in the started_list at
		 * this point, that means there is no TRB available.
		 */
		if (!list_empty(&dep->started_list))
			return 0;

		return DWC3_TRB_NUM - 1;
	}

	trbs_left = dep->trb_dequeue - dep->trb_enqueue;
	trbs_left &= (DWC3_TRB_NUM - 1);

	if (dep->trb_dequeue < dep->trb_enqueue)
		trbs_left--;

	return trbs_left;
}

/**
 * dwc3_prepare_one_trb - setup one TRB from one request
 * @dep: endpoint for which this request is prepared
 * @req: dwc3_request pointer
 * @trb_length: buffer size of the TRB
 * @chain: should this TRB be chained to the next?
 * @node: only for isochronous endpoints. First TRB needs different type.
 * @use_bounce_buffer: set to use bounce buffer
 * @must_interrupt: set to interrupt on TRB completion
 */
static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
		struct dwc3_request *req, unsigned int trb_length,
		unsigned int chain, unsigned int node, bool use_bounce_buffer,
		bool must_interrupt)
{
	struct dwc3_trb		*trb;
	dma_addr_t		dma;
	unsigned int		stream_id = req->request.stream_id;
	unsigned int		short_not_ok = req->request.short_not_ok;
	unsigned int		no_interrupt = req->request.no_interrupt;
	unsigned int		is_last = req->request.is_last;
	struct dwc3		*dwc = dep->dwc;
	struct usb_gadget	*gadget = dwc->gadget;
	enum usb_device_speed	speed = gadget->speed;

	if (use_bounce_buffer)
		dma = dep->dwc->bounce_addr;
	else if (req->request.num_sgs > 0)
		dma = sg_dma_address(req->start_sg);
	else
		dma = req->request.dma;

	trb = &dep->trb_pool[dep->trb_enqueue];

	if (!req->trb) {
		dwc3_gadget_move_started_request(req);
		req->trb = trb;
		req->trb_dma = dwc3_trb_dma_offset(dep, trb);
	}

	req->num_trbs++;

	trb->size = DWC3_TRB_SIZE_LENGTH(trb_length);
	trb->bpl = lower_32_bits(dma);
	trb->bph = upper_32_bits(dma);

	switch (usb_endpoint_type(dep->endpoint.desc)) {
	case USB_ENDPOINT_XFER_CONTROL:
		trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
		break;

	case USB_ENDPOINT_XFER_ISOC:
		if (!node) {
			trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;

			/*
			 * USB Specification 2.0 Section 5.9.2 states that: "If
			 * there is only a single transaction in the microframe,
			 * only a DATA0 data packet PID is used.  If there are
			 * two transactions per microframe, DATA1 is used for
			 * the first transaction data packet and DATA0 is used
			 * for the second transaction data packet.  If there are
			 * three transactions per microframe, DATA2 is used for
			 * the first transaction data packet, DATA1 is used for
			 * the second, and DATA0 is used for the third."
			 *
			 * IOW, we should satisfy the following cases:
			 *
			 * 1) length <= maxpacket
			 *	- DATA0
			 *
			 * 2) maxpacket < length <= (2 * maxpacket)
			 *	- DATA1, DATA0
			 *
			 * 3) (2 * maxpacket) < length <= (3 * maxpacket)
			 *	- DATA2, DATA1, DATA0
			 */
			if (speed == USB_SPEED_HIGH) {
				struct usb_ep *ep = &dep->endpoint;
				unsigned int mult = 2;
				unsigned int maxp = usb_endpoint_maxp(ep->desc);

				if (req->request.length <= (2 * maxp))
					mult--;

				if (req->request.length <= maxp)
					mult--;

				trb->size |= DWC3_TRB_SIZE_PCM1(mult);
			}
		} else {
			trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
		}

		if (!no_interrupt && !chain)
			trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
		break;

	case USB_ENDPOINT_XFER_BULK:
	case USB_ENDPOINT_XFER_INT:
		trb->ctrl = DWC3_TRBCTL_NORMAL;
		break;
	default:
		/*
		 * This is only possible with faulty memory because we
		 * checked it already :)
		 */
		dev_WARN(dwc->dev, "Unknown endpoint type %d\n",
				usb_endpoint_type(dep->endpoint.desc));
	}

	/*
	 * Enable Continue on Short Packet
	 * when endpoint is not a stream capable
	 */
	if (usb_endpoint_dir_out(dep->endpoint.desc)) {
		if (!dep->stream_capable)
			trb->ctrl |= DWC3_TRB_CTRL_CSP;

		if (short_not_ok)
			trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
	}

	/* All TRBs setup for MST must set CSP=1 when LST=0 */
	if (dep->stream_capable && DWC3_MST_CAPABLE(&dwc->hwparams))
		trb->ctrl |= DWC3_TRB_CTRL_CSP;

	if ((!no_interrupt && !chain) || must_interrupt)
		trb->ctrl |= DWC3_TRB_CTRL_IOC;

	if (chain)
		trb->ctrl |= DWC3_TRB_CTRL_CHN;
	else if (dep->stream_capable && is_last &&
		 !DWC3_MST_CAPABLE(&dwc->hwparams))
		trb->ctrl |= DWC3_TRB_CTRL_LST;

	if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
		trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(stream_id);

	/*
	 * As per data book 4.2.3.2TRB Control Bit Rules section
	 *
	 * The controller autonomously checks the HWO field of a TRB to determine if the
	 * entire TRB is valid. Therefore, software must ensure that the rest of the TRB
	 * is valid before setting the HWO field to '1'. In most systems, this means that
	 * software must update the fourth DWORD of a TRB last.
	 *
	 * However there is a possibility of CPU re-ordering here which can cause
	 * controller to observe the HWO bit set prematurely.
	 * Add a write memory barrier to prevent CPU re-ordering.
	 */
	wmb();
	trb->ctrl |= DWC3_TRB_CTRL_HWO;

	dwc3_ep_inc_enq(dep);

	trace_dwc3_prepare_trb(dep, trb);
}

static bool dwc3_needs_extra_trb(struct dwc3_ep *dep, struct dwc3_request *req)
{
	unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
	unsigned int rem = req->request.length % maxp;

	if ((req->request.length && req->request.zero && !rem &&
			!usb_endpoint_xfer_isoc(dep->endpoint.desc)) ||
			(!req->direction && rem))
		return true;

	return false;
}

/**
 * dwc3_prepare_last_sg - prepare TRBs for the last SG entry
 * @dep: The endpoint that the request belongs to
 * @req: The request to prepare
 * @entry_length: The last SG entry size
 * @node: Indicates whether this is not the first entry (for isoc only)
 *
 * Return the number of TRBs prepared.
 */
static int dwc3_prepare_last_sg(struct dwc3_ep *dep,
		struct dwc3_request *req, unsigned int entry_length,
		unsigned int node)
{
	unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
	unsigned int rem = req->request.length % maxp;
	unsigned int num_trbs = 1;

	if (dwc3_needs_extra_trb(dep, req))
		num_trbs++;

	if (dwc3_calc_trbs_left(dep) < num_trbs)
		return 0;

	req->needs_extra_trb = num_trbs > 1;

	/* Prepare a normal TRB */
	if (req->direction || req->request.length)
		dwc3_prepare_one_trb(dep, req, entry_length,
				req->needs_extra_trb, node, false, false);

	/* Prepare extra TRBs for ZLP and MPS OUT transfer alignment */
	if ((!req->direction && !req->request.length) || req->needs_extra_trb)
		dwc3_prepare_one_trb(dep, req,
				req->direction ? 0 : maxp - rem,
				false, 1, true, false);

	return num_trbs;
}

static int dwc3_prepare_trbs_sg(struct dwc3_ep *dep,
		struct dwc3_request *req)
{
	struct scatterlist *sg = req->start_sg;
	struct scatterlist *s;
	int		i;
	unsigned int length = req->request.length;
	unsigned int remaining = req->request.num_mapped_sgs
		- req->num_queued_sgs;
	unsigned int num_trbs = req->num_trbs;
	bool needs_extra_trb = dwc3_needs_extra_trb(dep, req);

	/*
	 * If we resume preparing the request, then get the remaining length of
	 * the request and resume where we left off.
	 */
	for_each_sg(req->request.sg, s, req->num_queued_sgs, i)
		length -= sg_dma_len(s);

	for_each_sg(sg, s, remaining, i) {
		unsigned int num_trbs_left = dwc3_calc_trbs_left(dep);
		unsigned int trb_length;
		bool must_interrupt = false;
		bool last_sg = false;

		trb_length = min_t(unsigned int, length, sg_dma_len(s));

		length -= trb_length;

		/*
		 * IOMMU driver is coalescing the list of sgs which shares a
		 * page boundary into one and giving it to USB driver. With
		 * this the number of sgs mapped is not equal to the number of
		 * sgs passed. So mark the chain bit to false if it isthe last
		 * mapped sg.
		 */
		if ((i == remaining - 1) || !length)
			last_sg = true;

		if (!num_trbs_left)
			break;

		if (last_sg) {
			if (!dwc3_prepare_last_sg(dep, req, trb_length, i))
				break;
		} else {
			/*
			 * Look ahead to check if we have enough TRBs for the
			 * next SG entry. If not, set interrupt on this TRB to
			 * resume preparing the next SG entry when more TRBs are
			 * free.
			 */
			if (num_trbs_left == 1 || (needs_extra_trb &&
					num_trbs_left <= 2 &&
					sg_dma_len(sg_next(s)) >= length)) {
				struct dwc3_request *r;

				/* Check if previous requests already set IOC */
				list_for_each_entry(r, &dep->started_list, list) {
					if (r != req && !r->request.no_interrupt)
						break;

					if (r == req)
						must_interrupt = true;
				}
			}

			dwc3_prepare_one_trb(dep, req, trb_length, 1, i, false,
					must_interrupt);
		}

		/*
		 * There can be a situation where all sgs in sglist are not
		 * queued because of insufficient trb number. To handle this
		 * case, update start_sg to next sg to be queued, so that
		 * we have free trbs we can continue queuing from where we
		 * previously stopped
		 */
		if (!last_sg)
			req->start_sg = sg_next(s);

		req->num_queued_sgs++;
		req->num_pending_sgs--;

		/*
		 * The number of pending SG entries may not correspond to the
		 * number of mapped SG entries. If all the data are queued, then
		 * don't include unused SG entries.
		 */
		if (length == 0) {
			req->num_pending_sgs = 0;
			break;
		}

		if (must_interrupt)
			break;
	}

	return req->num_trbs - num_trbs;
}

static int dwc3_prepare_trbs_linear(struct dwc3_ep *dep,
		struct dwc3_request *req)
{
	return dwc3_prepare_last_sg(dep, req, req->request.length, 0);
}

/*
 * dwc3_prepare_trbs - setup TRBs from requests
 * @dep: endpoint for which requests are being prepared
 *
 * The function goes through the requests list and sets up TRBs for the
 * transfers. The function returns once there are no more TRBs available or
 * it runs out of requests.
 *
 * Returns the number of TRBs prepared or negative errno.
 */
static int dwc3_prepare_trbs(struct dwc3_ep *dep)
{
	struct dwc3_request	*req, *n;
	int			ret = 0;

	BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);

	/*
	 * We can get in a situation where there's a request in the started list
	 * but there weren't enough TRBs to fully kick it in the first time
	 * around, so it has been waiting for more TRBs to be freed up.
	 *
	 * In that case, we should check if we have a request with pending_sgs
	 * in the started list and prepare TRBs for that request first,
	 * otherwise we will prepare TRBs completely out of order and that will
	 * break things.
	 */
	list_for_each_entry(req, &dep->started_list, list) {
		if (req->num_pending_sgs > 0) {
			ret = dwc3_prepare_trbs_sg(dep, req);
			if (!ret || req->num_pending_sgs)
				return ret;
		}

		if (!dwc3_calc_trbs_left(dep))
			return ret;

		/*
		 * Don't prepare beyond a transfer. In DWC_usb32, its transfer
		 * burst capability may try to read and use TRBs beyond the
		 * active transfer instead of stopping.
		 */
		if (dep->stream_capable && req->request.is_last &&
		    !DWC3_MST_CAPABLE(&dep->dwc->hwparams))
			return ret;
	}

	list_for_each_entry_safe(req, n, &dep->pending_list, list) {
		struct dwc3	*dwc = dep->dwc;

		ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
						    dep->direction);
		if (ret)
			return ret;

		req->sg			= req->request.sg;
		req->start_sg		= req->sg;
		req->num_queued_sgs	= 0;
		req->num_pending_sgs	= req->request.num_mapped_sgs;

		if (req->num_pending_sgs > 0) {
			ret = dwc3_prepare_trbs_sg(dep, req);
			if (req->num_pending_sgs)
				return ret;
		} else {
			ret = dwc3_prepare_trbs_linear(dep, req);
		}

		if (!ret || !dwc3_calc_trbs_left(dep))
			return ret;

		/*
		 * Don't prepare beyond a transfer. In DWC_usb32, its transfer
		 * burst capability may try to read and use TRBs beyond the
		 * active transfer instead of stopping.
		 */
		if (dep->stream_capable && req->request.is_last &&
		    !DWC3_MST_CAPABLE(&dwc->hwparams))
			return ret;
	}

	return ret;
}

static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep);

static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
{
	struct dwc3_gadget_ep_cmd_params params;
	struct dwc3_request		*req;
	int				starting;
	int				ret;
	u32				cmd;

	/*
	 * Note that it's normal to have no new TRBs prepared (i.e. ret == 0).
	 * This happens when we need to stop and restart a transfer such as in
	 * the case of reinitiating a stream or retrying an isoc transfer.
	 */
	ret = dwc3_prepare_trbs(dep);
	if (ret < 0)
		return ret;

	starting = !(dep->flags & DWC3_EP_TRANSFER_STARTED);

	/*
	 * If there's no new TRB prepared and we don't need to restart a
	 * transfer, there's no need to update the transfer.
	 */
	if (!ret && !starting)
		return ret;

	req = next_request(&dep->started_list);
	if (!req) {
		dep->flags |= DWC3_EP_PENDING_REQUEST;
		return 0;
	}

	memset(&params, 0, sizeof(params));

	if (starting) {
		params.param0 = upper_32_bits(req->trb_dma);
		params.param1 = lower_32_bits(req->trb_dma);
		cmd = DWC3_DEPCMD_STARTTRANSFER;

		if (dep->stream_capable)
			cmd |= DWC3_DEPCMD_PARAM(req->request.stream_id);

		if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
			cmd |= DWC3_DEPCMD_PARAM(dep->frame_number);
	} else {
		cmd = DWC3_DEPCMD_UPDATETRANSFER |
			DWC3_DEPCMD_PARAM(dep->resource_index);
	}

	ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
	if (ret < 0) {
		struct dwc3_request *tmp;

		if (ret == -EAGAIN)
			return ret;

		dwc3_stop_active_transfer(dep, true, true);

		list_for_each_entry_safe(req, tmp, &dep->started_list, list)
			dwc3_gadget_move_cancelled_request(req, DWC3_REQUEST_STATUS_DEQUEUED);

		/* If ep isn't started, then there's no end transfer pending */
		if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
			dwc3_gadget_ep_cleanup_cancelled_requests(dep);

		return ret;
	}

	if (dep->stream_capable && req->request.is_last &&
	    !DWC3_MST_CAPABLE(&dep->dwc->hwparams))
		dep->flags |= DWC3_EP_WAIT_TRANSFER_COMPLETE;

	return 0;
}

static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
{
	u32			reg;

	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
	return DWC3_DSTS_SOFFN(reg);
}

/**
 * __dwc3_stop_active_transfer - stop the current active transfer
 * @dep: isoc endpoint
 * @force: set forcerm bit in the command
 * @interrupt: command complete interrupt after End Transfer command
 *
 * When setting force, the ForceRM bit will be set. In that case
 * the controller won't update the TRB progress on command
 * completion. It also won't clear the HWO bit in the TRB.
 * The command will also not complete immediately in that case.
 */
static int __dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force, bool interrupt)
{
	struct dwc3 *dwc = dep->dwc;
	struct dwc3_gadget_ep_cmd_params params;
	u32 cmd;
	int ret;

	cmd = DWC3_DEPCMD_ENDTRANSFER;
	cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
	cmd |= interrupt ? DWC3_DEPCMD_CMDIOC : 0;
	cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
	memset(&params, 0, sizeof(params));
	ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
	/*
	 * If the End Transfer command was timed out while the device is
	 * not in SETUP phase, it's possible that an incoming Setup packet
	 * may prevent the command's completion. Let's retry when the
	 * ep0state returns to EP0_SETUP_PHASE.
	 */
	if (ret == -ETIMEDOUT && dep->dwc->ep0state != EP0_SETUP_PHASE) {
		dep->flags |= DWC3_EP_DELAY_STOP;
		return 0;
	}
	WARN_ON_ONCE(ret);
	dep->resource_index = 0;

	if (!interrupt) {
		if (!DWC3_IP_IS(DWC3) || DWC3_VER_IS_PRIOR(DWC3, 310A))
			mdelay(1);
		dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
	} else if (!ret) {
		dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
	}

	dep->flags &= ~DWC3_EP_DELAY_STOP;
	return ret;
}

/**
 * dwc3_gadget_start_isoc_quirk - workaround invalid frame number
 * @dep: isoc endpoint
 *
 * This function tests for the correct combination of BIT[15:14] from the 16-bit
 * microframe number reported by the XferNotReady event for the future frame
 * number to start the isoc transfer.
 *
 * In DWC_usb31 version 1.70a-ea06 and prior, for highspeed and fullspeed
 * isochronous IN, BIT[15:14] of the 16-bit microframe number reported by the
 * XferNotReady event are invalid. The driver uses this number to schedule the
 * isochronous transfer and passes it to the START TRANSFER command. Because
 * this number is invalid, the command may fail. If BIT[15:14] matches the
 * internal 16-bit microframe, the START TRANSFER command will pass and the
 * transfer will start at the scheduled time, if it is off by 1, the command
 * will still pass, but the transfer will start 2 seconds in the future. For all
 * other conditions, the START TRANSFER command will fail with bus-expiry.
 *
 * In order to workaround this issue, we can test for the correct combination of
 * BIT[15:14] by sending START TRANSFER commands with different values of
 * BIT[15:14]: 'b00, 'b01, 'b10, and 'b11. Each combination is 2^14 uframe apart
 * (or 2 seconds). 4 seconds into the future will result in a bus-expiry status.
 * As the result, within the 4 possible combinations for BIT[15:14], there will
 * be 2 successful and 2 failure START COMMAND status. One of the 2 successful
 * command status will result in a 2-second delay start. The smaller BIT[15:14]
 * value is the correct combination.
 *
 * Since there are only 4 outcomes and the results are ordered, we can simply
 * test 2 START TRANSFER commands with BIT[15:14] combinations 'b00 and 'b01 to
 * deduce the smaller successful combination.
 *
 * Let test0 = test status for combination 'b00 and test1 = test status for 'b01
 * of BIT[15:14]. The correct combination is as follow:
 *
 * if test0 fails and test1 passes, BIT[15:14] is 'b01
 * if test0 fails and test1 fails, BIT[15:14] is 'b10
 * if test0 passes and test1 fails, BIT[15:14] is 'b11
 * if test0 passes and test1 passes, BIT[15:14] is 'b00
 *
 * Synopsys STAR 9001202023: Wrong microframe number for isochronous IN
 * endpoints.
 */
static int dwc3_gadget_start_isoc_quirk(struct dwc3_ep *dep)
{
	int cmd_status = 0;
	bool test0;
	bool test1;

	while (dep->combo_num < 2) {
		struct dwc3_gadget_ep_cmd_params params;
		u32 test_frame_number;
		u32 cmd;

		/*
		 * Check if we can start isoc transfer on the next interval or
		 * 4 uframes in the future with BIT[15:14] as dep->combo_num
		 */
		test_frame_number = dep->frame_number & DWC3_FRNUMBER_MASK;
		test_frame_number |= dep->combo_num << 14;
		test_frame_number += max_t(u32, 4, dep->interval);

		params.param0 = upper_32_bits(dep->dwc->bounce_addr);
		params.param1 = lower_32_bits(dep->dwc->bounce_addr);

		cmd = DWC3_DEPCMD_STARTTRANSFER;
		cmd |= DWC3_DEPCMD_PARAM(test_frame_number);
		cmd_status = dwc3_send_gadget_ep_cmd(dep, cmd, &params);

		/* Redo if some other failure beside bus-expiry is received */
		if (cmd_status && cmd_status != -EAGAIN) {
			dep->start_cmd_status = 0;
			dep->combo_num = 0;
			return 0;
		}

		/* Store the first test status */
		if (dep->combo_num == 0)
			dep->start_cmd_status = cmd_status;

		dep->combo_num++;

		/*
		 * End the transfer if the START_TRANSFER command is successful
		 * to wait for the next XferNotReady to test the command again
		 */
		if (cmd_status == 0) {
			dwc3_stop_active_transfer(dep, true, true);
			return 0;
		}
	}

	/* test0 and test1 are both completed at this point */
	test0 = (dep->start_cmd_status == 0);
	test1 = (cmd_status == 0);

	if (!test0 && test1)
		dep->combo_num = 1;
	else if (!test0 && !test1)
		dep->combo_num = 2;
	else if (test0 && !test1)
		dep->combo_num = 3;
	else if (test0 && test1)
		dep->combo_num = 0;

	dep->frame_number &= DWC3_FRNUMBER_MASK;
	dep->frame_number |= dep->combo_num << 14;
	dep->frame_number += max_t(u32, 4, dep->interval);

	/* Reinitialize test variables */
	dep->start_cmd_status = 0;
	dep->combo_num = 0;

	return __dwc3_gadget_kick_transfer(dep);
}

static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
{
	const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
	struct dwc3 *dwc = dep->dwc;
	int ret;
	int i;

	if (list_empty(&dep->pending_list) &&
	    list_empty(&dep->started_list)) {
		dep->flags |= DWC3_EP_PENDING_REQUEST;
		return -EAGAIN;
	}

	if (!dwc->dis_start_transfer_quirk &&
	    (DWC3_VER_IS_PRIOR(DWC31, 170A) ||
	     DWC3_VER_TYPE_IS_WITHIN(DWC31, 170A, EA01, EA06))) {
		if (dwc->gadget->speed <= USB_SPEED_HIGH && dep->direction)
			return dwc3_gadget_start_isoc_quirk(dep);
	}

	if (desc->bInterval <= 14 &&
	    dwc->gadget->speed >= USB_SPEED_HIGH) {
		u32 frame = __dwc3_gadget_get_frame(dwc);
		bool rollover = frame <
				(dep->frame_number & DWC3_FRNUMBER_MASK);

		/*
		 * frame_number is set from XferNotReady and may be already
		 * out of date. DSTS only provides the lower 14 bit of the
		 * current frame number. So add the upper two bits of
		 * frame_number and handle a possible rollover.
		 * This will provide the correct frame_number unless more than
		 * rollover has happened since XferNotReady.
		 */

		dep->frame_number = (dep->frame_number & ~DWC3_FRNUMBER_MASK) |
				     frame;
		if (rollover)
			dep->frame_number += BIT(14);
	}

	for (i = 0; i < DWC3_ISOC_MAX_RETRIES; i++) {
		int future_interval = i + 1;

		/* Give the controller at least 500us to schedule transfers */
		if (desc->bInterval < 3)
			future_interval += 3 - desc->bInterval;

		dep->frame_number = DWC3_ALIGN_FRAME(dep, future_interval);

		ret = __dwc3_gadget_kick_transfer(dep);
		if (ret != -EAGAIN)
			break;
	}

	/*
	 * After a number of unsuccessful start attempts due to bus-expiry
	 * status, issue END_TRANSFER command and retry on the next XferNotReady
	 * event.
	 */
	if (ret == -EAGAIN)
		ret = __dwc3_stop_active_transfer(dep, false, true);

	return ret;
}

static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
{
	struct dwc3		*dwc = dep->dwc;

	if (!dep->endpoint.desc || !dwc->pullups_connected || !dwc->connected) {
		dev_dbg(dwc->dev, "%s: can't queue to disabled endpoint\n",
				dep->name);
		return -ESHUTDOWN;
	}

	if (WARN(req->dep != dep, "request %pK belongs to '%s'\n",
				&req->request, req->dep->name))
		return -EINVAL;

	if (WARN(req->status < DWC3_REQUEST_STATUS_COMPLETED,
				"%s: request %pK already in flight\n",
				dep->name, &req->request))
		return -EINVAL;

	pm_runtime_get(dwc->dev);

	req->request.actual	= 0;
	req->request.status	= -EINPROGRESS;

	trace_dwc3_ep_queue(req);

	list_add_tail(&req->list, &dep->pending_list);
	req->status = DWC3_REQUEST_STATUS_QUEUED;

	if (dep->flags & DWC3_EP_WAIT_TRANSFER_COMPLETE)
		return 0;

	/*
	 * Start the transfer only after the END_TRANSFER is completed
	 * and endpoint STALL is cleared.
	 */
	if ((dep->flags & DWC3_EP_END_TRANSFER_PENDING) ||
	    (dep->flags & DWC3_EP_WEDGE) ||
	    (dep->flags & DWC3_EP_DELAY_STOP) ||
	    (dep->flags & DWC3_EP_STALL)) {
		dep->flags |= DWC3_EP_DELAY_START;
		return 0;
	}

	/*
	 * NOTICE: Isochronous endpoints should NEVER be prestarted. We must
	 * wait for a XferNotReady event so we will know what's the current
	 * (micro-)frame number.
	 *
	 * Without this trick, we are very, very likely gonna get Bus Expiry
	 * errors which will force us issue EndTransfer command.
	 */
	if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
		if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) {
			if ((dep->flags & DWC3_EP_PENDING_REQUEST))
				return __dwc3_gadget_start_isoc(dep);

			return 0;
		}
	}

	__dwc3_gadget_kick_transfer(dep);

	return 0;
}

static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
	gfp_t gfp_flags)
{
	struct dwc3_request		*req = to_dwc3_request(request);
	struct dwc3_ep			*dep = to_dwc3_ep(ep);
	struct dwc3			*dwc = dep->dwc;

	unsigned long			flags;

	int				ret;

	spin_lock_irqsave(&dwc->lock, flags);
	ret = __dwc3_gadget_ep_queue(dep, req);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return ret;
}

static void dwc3_gadget_ep_skip_trbs(struct dwc3_ep *dep, struct dwc3_request *req)
{
	int i;

	/* If req->trb is not set, then the request has not started */
	if (!req->trb)
		return;

	/*
	 * If request was already started, this means we had to
	 * stop the transfer. With that we also need to ignore
	 * all TRBs used by the request, however TRBs can only
	 * be modified after completion of END_TRANSFER
	 * command. So what we do here is that we wait for
	 * END_TRANSFER completion and only after that, we jump
	 * over TRBs by clearing HWO and incrementing dequeue
	 * pointer.
	 */
	for (i = 0; i < req->num_trbs; i++) {
		struct dwc3_trb *trb;

		trb = &dep->trb_pool[dep->trb_dequeue];
		trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
		dwc3_ep_inc_deq(dep);
	}

	req->num_trbs = 0;
}

static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep)
{
	struct dwc3_request		*req;
	struct dwc3			*dwc = dep->dwc;

	while (!list_empty(&dep->cancelled_list)) {
		req = next_request(&dep->cancelled_list);
		dwc3_gadget_ep_skip_trbs(dep, req);
		switch (req->status) {
		case DWC3_REQUEST_STATUS_DISCONNECTED:
			dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
			break;
		case DWC3_REQUEST_STATUS_DEQUEUED:
			dwc3_gadget_giveback(dep, req, -ECONNRESET);
			break;
		case DWC3_REQUEST_STATUS_STALLED:
			dwc3_gadget_giveback(dep, req, -EPIPE);
			break;
		default:
			dev_err(dwc->dev, "request cancelled with wrong reason:%d\n", req->status);
			dwc3_gadget_giveback(dep, req, -ECONNRESET);
			break;
		}
		/*
		 * The endpoint is disabled, let the dwc3_remove_requests()
		 * handle the cleanup.
		 */
		if (!dep->endpoint.desc)
			break;
	}
}

static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
		struct usb_request *request)
{
	struct dwc3_request		*req = to_dwc3_request(request);
	struct dwc3_request		*r = NULL;

	struct dwc3_ep			*dep = to_dwc3_ep(ep);
	struct dwc3			*dwc = dep->dwc;

	unsigned long			flags;
	int				ret = 0;

	trace_dwc3_ep_dequeue(req);

	spin_lock_irqsave(&dwc->lock, flags);

	list_for_each_entry(r, &dep->cancelled_list, list) {
		if (r == req)
			goto out;
	}

	list_for_each_entry(r, &dep->pending_list, list) {
		if (r == req) {
			/*
			 * Explicitly check for EP0/1 as dequeue for those
			 * EPs need to be handled differently.  Control EP
			 * only deals with one USB req, and giveback will
			 * occur during dwc3_ep0_stall_and_restart().  EP0
			 * requests are never added to started_list.
			 */
			if (dep->number > 1)
				dwc3_gadget_giveback(dep, req, -ECONNRESET);
			else
				dwc3_ep0_reset_state(dwc);
			goto out;
		}
	}

	list_for_each_entry(r, &dep->started_list, list) {
		if (r == req) {
			struct dwc3_request *t;

			/* wait until it is processed */
			dwc3_stop_active_transfer(dep, true, true);

			/*
			 * Remove any started request if the transfer is
			 * cancelled.
			 */
			list_for_each_entry_safe(r, t, &dep->started_list, list)
				dwc3_gadget_move_cancelled_request(r,
						DWC3_REQUEST_STATUS_DEQUEUED);

			dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE;

			goto out;
		}
	}

	dev_err(dwc->dev, "request %pK was not queued to %s\n",
		request, ep->name);
	ret = -EINVAL;
out:
	spin_unlock_irqrestore(&dwc->lock, flags);

	return ret;
}

int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
{
	struct dwc3_gadget_ep_cmd_params	params;
	struct dwc3				*dwc = dep->dwc;
	struct dwc3_request			*req;
	struct dwc3_request			*tmp;
	int					ret;

	if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
		dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
		return -EINVAL;
	}

	memset(&params, 0x00, sizeof(params));

	if (value) {
		struct dwc3_trb *trb;

		unsigned int transfer_in_flight;
		unsigned int started;

		if (dep->number > 1)
			trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
		else
			trb = &dwc->ep0_trb[dep->trb_enqueue];

		transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO;
		started = !list_empty(&dep->started_list);

		if (!protocol && ((dep->direction && transfer_in_flight) ||
				(!dep->direction && started))) {
			return -EAGAIN;
		}

		ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL,
				&params);
		if (ret)
			dev_err(dwc->dev, "failed to set STALL on %s\n",
					dep->name);
		else
			dep->flags |= DWC3_EP_STALL;
	} else {
		/*
		 * Don't issue CLEAR_STALL command to control endpoints. The
		 * controller automatically clears the STALL when it receives
		 * the SETUP token.
		 */
		if (dep->number <= 1) {
			dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
			return 0;
		}

		dwc3_stop_active_transfer(dep, true, true);

		list_for_each_entry_safe(req, tmp, &dep->started_list, list)
			dwc3_gadget_move_cancelled_request(req, DWC3_REQUEST_STATUS_STALLED);

		if (dep->flags & DWC3_EP_END_TRANSFER_PENDING ||
		    (dep->flags & DWC3_EP_DELAY_STOP)) {
			dep->flags |= DWC3_EP_PENDING_CLEAR_STALL;
			if (protocol)
				dwc->clear_stall_protocol = dep->number;

			return 0;
		}

		dwc3_gadget_ep_cleanup_cancelled_requests(dep);

		ret = dwc3_send_clear_stall_ep_cmd(dep);
		if (ret) {
			dev_err(dwc->dev, "failed to clear STALL on %s\n",
					dep->name);
			return ret;
		}

		dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);

		if ((dep->flags & DWC3_EP_DELAY_START) &&
		    !usb_endpoint_xfer_isoc(dep->endpoint.desc))
			__dwc3_gadget_kick_transfer(dep);

		dep->flags &= ~DWC3_EP_DELAY_START;
	}

	return ret;
}

static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
{
	struct dwc3_ep			*dep = to_dwc3_ep(ep);
	struct dwc3			*dwc = dep->dwc;

	unsigned long			flags;

	int				ret;

	spin_lock_irqsave(&dwc->lock, flags);
	ret = __dwc3_gadget_ep_set_halt(dep, value, false);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return ret;
}

static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
{
	struct dwc3_ep			*dep = to_dwc3_ep(ep);
	struct dwc3			*dwc = dep->dwc;
	unsigned long			flags;
	int				ret;

	spin_lock_irqsave(&dwc->lock, flags);
	dep->flags |= DWC3_EP_WEDGE;

	if (dep->number == 0 || dep->number == 1)
		ret = __dwc3_gadget_ep0_set_halt(ep, 1);
	else
		ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return ret;
}

/* -------------------------------------------------------------------------- */

static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
	.bLength	= USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bmAttributes	= USB_ENDPOINT_XFER_CONTROL,
};

static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
	.enable		= dwc3_gadget_ep0_enable,
	.disable	= dwc3_gadget_ep0_disable,
	.alloc_request	= dwc3_gadget_ep_alloc_request,
	.free_request	= dwc3_gadget_ep_free_request,
	.queue		= dwc3_gadget_ep0_queue,
	.dequeue	= dwc3_gadget_ep_dequeue,
	.set_halt	= dwc3_gadget_ep0_set_halt,
	.set_wedge	= dwc3_gadget_ep_set_wedge,
};

static const struct usb_ep_ops dwc3_gadget_ep_ops = {
	.enable		= dwc3_gadget_ep_enable,
	.disable	= dwc3_gadget_ep_disable,
	.alloc_request	= dwc3_gadget_ep_alloc_request,
	.free_request	= dwc3_gadget_ep_free_request,
	.queue		= dwc3_gadget_ep_queue,
	.dequeue	= dwc3_gadget_ep_dequeue,
	.set_halt	= dwc3_gadget_ep_set_halt,
	.set_wedge	= dwc3_gadget_ep_set_wedge,
};

/* -------------------------------------------------------------------------- */

static void dwc3_gadget_enable_linksts_evts(struct dwc3 *dwc, bool set)
{
	u32 reg;

	if (DWC3_VER_IS_PRIOR(DWC3, 250A))
		return;

	reg = dwc3_readl(dwc->regs, DWC3_DEVTEN);
	if (set)
		reg |= DWC3_DEVTEN_ULSTCNGEN;
	else
		reg &= ~DWC3_DEVTEN_ULSTCNGEN;

	dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
}

static int dwc3_gadget_get_frame(struct usb_gadget *g)
{
	struct dwc3		*dwc = gadget_to_dwc(g);

	return __dwc3_gadget_get_frame(dwc);
}

static int __dwc3_gadget_wakeup(struct dwc3 *dwc, bool async)
{
	int			retries;

	int			ret;
	u32			reg;

	u8			link_state;

	/*
	 * According to the Databook Remote wakeup request should
	 * be issued only when the device is in early suspend state.
	 *
	 * We can check that via USB Link State bits in DSTS register.
	 */
	reg = dwc3_readl(dwc->regs, DWC3_DSTS);

	link_state = DWC3_DSTS_USBLNKST(reg);

	switch (link_state) {
	case DWC3_LINK_STATE_RESET:
	case DWC3_LINK_STATE_RX_DET:	/* in HS, means Early Suspend */
	case DWC3_LINK_STATE_U3:	/* in HS, means SUSPEND */
	case DWC3_LINK_STATE_U2:	/* in HS, means Sleep (L1) */
	case DWC3_LINK_STATE_U1:
	case DWC3_LINK_STATE_RESUME:
		break;
	default:
		return -EINVAL;
	}

	if (async)
		dwc3_gadget_enable_linksts_evts(dwc, true);

	ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
	if (ret < 0) {
		dev_err(dwc->dev, "failed to put link in Recovery\n");
		dwc3_gadget_enable_linksts_evts(dwc, false);
		return ret;
	}

	/* Recent versions do this automatically */
	if (DWC3_VER_IS_PRIOR(DWC3, 194A)) {
		/* write zeroes to Link Change Request */
		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
		reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
		dwc3_writel(dwc->regs, DWC3_DCTL, reg);
	}

	/*
	 * Since link status change events are enabled we will receive
	 * an U0 event when wakeup is successful. So bail out.
	 */
	if (async)
		return 0;

	/* poll until Link State changes to ON */
	retries = 20000;

	while (retries--) {
		reg = dwc3_readl(dwc->regs, DWC3_DSTS);

		/* in HS, means ON */
		if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
			break;
	}

	if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
		dev_err(dwc->dev, "failed to send remote wakeup\n");
		return -EINVAL;
	}

	return 0;
}

static int dwc3_gadget_wakeup(struct usb_gadget *g)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	unsigned long		flags;
	int			ret;

	if (!dwc->wakeup_configured) {
		dev_err(dwc->dev, "remote wakeup not configured\n");
		return -EINVAL;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	if (!dwc->gadget->wakeup_armed) {
		dev_err(dwc->dev, "not armed for remote wakeup\n");
		spin_unlock_irqrestore(&dwc->lock, flags);
		return -EINVAL;
	}
	ret = __dwc3_gadget_wakeup(dwc, true);

	spin_unlock_irqrestore(&dwc->lock, flags);

	return ret;
}

static void dwc3_resume_gadget(struct dwc3 *dwc);

static int dwc3_gadget_func_wakeup(struct usb_gadget *g, int intf_id)
{
	struct  dwc3		*dwc = gadget_to_dwc(g);
	unsigned long		flags;
	int			ret;
	int			link_state;

	if (!dwc->wakeup_configured) {
		dev_err(dwc->dev, "remote wakeup not configured\n");
		return -EINVAL;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	/*
	 * If the link is in U3, signal for remote wakeup and wait for the
	 * link to transition to U0 before sending device notification.
	 */
	link_state = dwc3_gadget_get_link_state(dwc);
	if (link_state == DWC3_LINK_STATE_U3) {
		ret = __dwc3_gadget_wakeup(dwc, false);
		if (ret) {
			spin_unlock_irqrestore(&dwc->lock, flags);
			return -EINVAL;
		}
		dwc3_resume_gadget(dwc);
		dwc->suspended = false;
		dwc->link_state = DWC3_LINK_STATE_U0;
	}

	ret = dwc3_send_gadget_generic_command(dwc, DWC3_DGCMD_DEV_NOTIFICATION,
					       DWC3_DGCMDPAR_DN_FUNC_WAKE |
					       DWC3_DGCMDPAR_INTF_SEL(intf_id));
	if (ret)
		dev_err(dwc->dev, "function remote wakeup failed, ret:%d\n", ret);

	spin_unlock_irqrestore(&dwc->lock, flags);

	return ret;
}

static int dwc3_gadget_set_remote_wakeup(struct usb_gadget *g, int set)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	unsigned long		flags;

	spin_lock_irqsave(&dwc->lock, flags);
	dwc->wakeup_configured = !!set;
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
		int is_selfpowered)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	unsigned long		flags;

	spin_lock_irqsave(&dwc->lock, flags);
	g->is_selfpowered = !!is_selfpowered;
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static void dwc3_stop_active_transfers(struct dwc3 *dwc)
{
	u32 epnum;

	for (epnum = 2; epnum < dwc->num_eps; epnum++) {
		struct dwc3_ep *dep;

		dep = dwc->eps[epnum];
		if (!dep)
			continue;

		dwc3_remove_requests(dwc, dep, -ESHUTDOWN);
	}
}

static void __dwc3_gadget_set_ssp_rate(struct dwc3 *dwc)
{
	enum usb_ssp_rate	ssp_rate = dwc->gadget_ssp_rate;
	u32			reg;

	if (ssp_rate == USB_SSP_GEN_UNKNOWN)
		ssp_rate = dwc->max_ssp_rate;

	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
	reg &= ~DWC3_DCFG_SPEED_MASK;
	reg &= ~DWC3_DCFG_NUMLANES(~0);

	if (ssp_rate == USB_SSP_GEN_1x2)
		reg |= DWC3_DCFG_SUPERSPEED;
	else if (dwc->max_ssp_rate != USB_SSP_GEN_1x2)
		reg |= DWC3_DCFG_SUPERSPEED_PLUS;

	if (ssp_rate != USB_SSP_GEN_2x1 &&
	    dwc->max_ssp_rate != USB_SSP_GEN_2x1)
		reg |= DWC3_DCFG_NUMLANES(1);

	dwc3_writel(dwc->regs, DWC3_DCFG, reg);
}

static void __dwc3_gadget_set_speed(struct dwc3 *dwc)
{
	enum usb_device_speed	speed;
	u32			reg;

	speed = dwc->gadget_max_speed;
	if (speed == USB_SPEED_UNKNOWN || speed > dwc->maximum_speed)
		speed = dwc->maximum_speed;

	if (speed == USB_SPEED_SUPER_PLUS &&
	    DWC3_IP_IS(DWC32)) {
		__dwc3_gadget_set_ssp_rate(dwc);
		return;
	}

	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
	reg &= ~(DWC3_DCFG_SPEED_MASK);

	/*
	 * WORKAROUND: DWC3 revision < 2.20a have an issue
	 * which would cause metastability state on Run/Stop
	 * bit if we try to force the IP to USB2-only mode.
	 *
	 * Because of that, we cannot configure the IP to any
	 * speed other than the SuperSpeed
	 *
	 * Refers to:
	 *
	 * STAR#9000525659: Clock Domain Crossing on DCTL in
	 * USB 2.0 Mode
	 */
	if (DWC3_VER_IS_PRIOR(DWC3, 220A) &&
	    !dwc->dis_metastability_quirk) {
		reg |= DWC3_DCFG_SUPERSPEED;
	} else {
		switch (speed) {
		case USB_SPEED_FULL:
			reg |= DWC3_DCFG_FULLSPEED;
			break;
		case USB_SPEED_HIGH:
			reg |= DWC3_DCFG_HIGHSPEED;
			break;
		case USB_SPEED_SUPER:
			reg |= DWC3_DCFG_SUPERSPEED;
			break;
		case USB_SPEED_SUPER_PLUS:
			if (DWC3_IP_IS(DWC3))
				reg |= DWC3_DCFG_SUPERSPEED;
			else
				reg |= DWC3_DCFG_SUPERSPEED_PLUS;
			break;
		default:
			dev_err(dwc->dev, "invalid speed (%d)\n", speed);

			if (DWC3_IP_IS(DWC3))
				reg |= DWC3_DCFG_SUPERSPEED;
			else
				reg |= DWC3_DCFG_SUPERSPEED_PLUS;
		}
	}

	if (DWC3_IP_IS(DWC32) &&
	    speed > USB_SPEED_UNKNOWN &&
	    speed < USB_SPEED_SUPER_PLUS)
		reg &= ~DWC3_DCFG_NUMLANES(~0);

	dwc3_writel(dwc->regs, DWC3_DCFG, reg);
}

static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
{
	u32			reg;
	u32			timeout = 2000;

	if (pm_runtime_suspended(dwc->dev))
		return 0;

	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
	if (is_on) {
		if (DWC3_VER_IS_WITHIN(DWC3, ANY, 187A)) {
			reg &= ~DWC3_DCTL_TRGTULST_MASK;
			reg |= DWC3_DCTL_TRGTULST_RX_DET;
		}

		if (!DWC3_VER_IS_PRIOR(DWC3, 194A))
			reg &= ~DWC3_DCTL_KEEP_CONNECT;
		reg |= DWC3_DCTL_RUN_STOP;

		__dwc3_gadget_set_speed(dwc);
		dwc->pullups_connected = true;
	} else {
		reg &= ~DWC3_DCTL_RUN_STOP;

		dwc->pullups_connected = false;
	}

	dwc3_gadget_dctl_write_safe(dwc, reg);

	do {
		usleep_range(1000, 2000);
		reg = dwc3_readl(dwc->regs, DWC3_DSTS);
		reg &= DWC3_DSTS_DEVCTRLHLT;
	} while (--timeout && !(!is_on ^ !reg));

	if (!timeout)
		return -ETIMEDOUT;

	return 0;
}

static void dwc3_gadget_disable_irq(struct dwc3 *dwc);
static void __dwc3_gadget_stop(struct dwc3 *dwc);
static int __dwc3_gadget_start(struct dwc3 *dwc);

static int dwc3_gadget_soft_disconnect(struct dwc3 *dwc)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&dwc->lock, flags);
	if (!dwc->pullups_connected) {
		spin_unlock_irqrestore(&dwc->lock, flags);
		return 0;
	}

	dwc->connected = false;

	/*
	 * Attempt to end pending SETUP status phase, and not wait for the
	 * function to do so.
	 */
	if (dwc->delayed_status)
		dwc3_ep0_send_delayed_status(dwc);

	/*
	 * In the Synopsys DesignWare Cores USB3 Databook Rev. 3.30a
	 * Section 4.1.8 Table 4-7, it states that for a device-initiated
	 * disconnect, the SW needs to ensure that it sends "a DEPENDXFER
	 * command for any active transfers" before clearing the RunStop
	 * bit.
	 */
	dwc3_stop_active_transfers(dwc);
	spin_unlock_irqrestore(&dwc->lock, flags);

	/*
	 * Per databook, when we want to stop the gadget, if a control transfer
	 * is still in process, complete it and get the core into setup phase.
	 * In case the host is unresponsive to a SETUP transaction, forcefully
	 * stall the transfer, and move back to the SETUP phase, so that any
	 * pending endxfers can be executed.
	 */
	if (dwc->ep0state != EP0_SETUP_PHASE) {
		reinit_completion(&dwc->ep0_in_setup);

		ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
				msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
		if (ret == 0) {
			dev_warn(dwc->dev, "wait for SETUP phase timed out\n");
			spin_lock_irqsave(&dwc->lock, flags);
			dwc3_ep0_reset_state(dwc);
			spin_unlock_irqrestore(&dwc->lock, flags);
		}
	}

	/*
	 * Note: if the GEVNTCOUNT indicates events in the event buffer, the
	 * driver needs to acknowledge them before the controller can halt.
	 * Simply let the interrupt handler acknowledges and handle the
	 * remaining event generated by the controller while polling for
	 * DSTS.DEVCTLHLT.
	 */
	ret = dwc3_gadget_run_stop(dwc, false);

	/*
	 * Stop the gadget after controller is halted, so that if needed, the
	 * events to update EP0 state can still occur while the run/stop
	 * routine polls for the halted state.  DEVTEN is cleared as part of
	 * gadget stop.
	 */
	spin_lock_irqsave(&dwc->lock, flags);
	__dwc3_gadget_stop(dwc);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return ret;
}

static int dwc3_gadget_soft_connect(struct dwc3 *dwc)
{
	int ret;

	/*
	 * In the Synopsys DWC_usb31 1.90a programming guide section
	 * 4.1.9, it specifies that for a reconnect after a
	 * device-initiated disconnect requires a core soft reset
	 * (DCTL.CSftRst) before enabling the run/stop bit.
	 */
	ret = dwc3_core_soft_reset(dwc);
	if (ret)
		return ret;

	dwc3_event_buffers_setup(dwc);
	__dwc3_gadget_start(dwc);
	return dwc3_gadget_run_stop(dwc, true);
}

static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	int			ret;

	is_on = !!is_on;

	dwc->softconnect = is_on;

	/*
	 * Avoid issuing a runtime resume if the device is already in the
	 * suspended state during gadget disconnect.  DWC3 gadget was already
	 * halted/stopped during runtime suspend.
	 */
	if (!is_on) {
		pm_runtime_barrier(dwc->dev);
		if (pm_runtime_suspended(dwc->dev))
			return 0;
	}

	/*
	 * Check the return value for successful resume, or error.  For a
	 * successful resume, the DWC3 runtime PM resume routine will handle
	 * the run stop sequence, so avoid duplicate operations here.
	 */
	ret = pm_runtime_get_sync(dwc->dev);
	if (!ret || ret < 0) {
		pm_runtime_put(dwc->dev);
		if (ret < 0)
			pm_runtime_set_suspended(dwc->dev);
		return ret;
	}

	if (dwc->pullups_connected == is_on) {
		pm_runtime_put(dwc->dev);
		return 0;
	}

	synchronize_irq(dwc->irq_gadget);

	if (!is_on)
		ret = dwc3_gadget_soft_disconnect(dwc);
	else
		ret = dwc3_gadget_soft_connect(dwc);

	pm_runtime_put(dwc->dev);

	return ret;
}

static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
{
	u32			reg;

	/* Enable all but Start and End of Frame IRQs */
	reg = (DWC3_DEVTEN_EVNTOVERFLOWEN |
			DWC3_DEVTEN_CMDCMPLTEN |
			DWC3_DEVTEN_ERRTICERREN |
			DWC3_DEVTEN_WKUPEVTEN |
			DWC3_DEVTEN_CONNECTDONEEN |
			DWC3_DEVTEN_USBRSTEN |
			DWC3_DEVTEN_DISCONNEVTEN);

	if (DWC3_VER_IS_PRIOR(DWC3, 250A))
		reg |= DWC3_DEVTEN_ULSTCNGEN;

	/* On 2.30a and above this bit enables U3/L2-L1 Suspend Events */
	if (!DWC3_VER_IS_PRIOR(DWC3, 230A))
		reg |= DWC3_DEVTEN_U3L2L1SUSPEN;

	dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
}

static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
{
	/* mask all interrupts */
	dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
}

static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);

/**
 * dwc3_gadget_setup_nump - calculate and initialize NUMP field of %DWC3_DCFG
 * @dwc: pointer to our context structure
 *
 * The following looks like complex but it's actually very simple. In order to
 * calculate the number of packets we can burst at once on OUT transfers, we're
 * gonna use RxFIFO size.
 *
 * To calculate RxFIFO size we need two numbers:
 * MDWIDTH = size, in bits, of the internal memory bus
 * RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits)
 *
 * Given these two numbers, the formula is simple:
 *
 * RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16;
 *
 * 24 bytes is for 3x SETUP packets
 * 16 bytes is a clock domain crossing tolerance
 *
 * Given RxFIFO Size, NUMP = RxFIFOSize / 1024;
 */
static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
{
	u32 ram2_depth;
	u32 mdwidth;
	u32 nump;
	u32 reg;

	ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
	mdwidth = dwc3_mdwidth(dwc);

	nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
	nump = min_t(u32, nump, 16);

	/* update NumP */
	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
	reg &= ~DWC3_DCFG_NUMP_MASK;
	reg |= nump << DWC3_DCFG_NUMP_SHIFT;
	dwc3_writel(dwc->regs, DWC3_DCFG, reg);
}

static int __dwc3_gadget_start(struct dwc3 *dwc)
{
	struct dwc3_ep		*dep;
	int			ret = 0;
	u32			reg;

	/*
	 * Use IMOD if enabled via dwc->imod_interval. Otherwise, if
	 * the core supports IMOD, disable it.
	 */
	if (dwc->imod_interval) {
		dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
		dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
	} else if (dwc3_has_imod(dwc)) {
		dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0);
	}

	/*
	 * We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
	 * field instead of letting dwc3 itself calculate that automatically.
	 *
	 * This way, we maximize the chances that we'll be able to get several
	 * bursts of data without going through any sort of endpoint throttling.
	 */
	reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
	if (DWC3_IP_IS(DWC3))
		reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
	else
		reg &= ~DWC31_GRXTHRCFG_PKTCNTSEL;

	dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);

	dwc3_gadget_setup_nump(dwc);

	/*
	 * Currently the controller handles single stream only. So, Ignore
	 * Packet Pending bit for stream selection and don't search for another
	 * stream if the host sends Data Packet with PP=0 (for OUT direction) or
	 * ACK with NumP=0 and PP=0 (for IN direction). This slightly improves
	 * the stream performance.
	 */
	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
	reg |= DWC3_DCFG_IGNSTRMPP;
	dwc3_writel(dwc->regs, DWC3_DCFG, reg);

	/* Enable MST by default if the device is capable of MST */
	if (DWC3_MST_CAPABLE(&dwc->hwparams)) {
		reg = dwc3_readl(dwc->regs, DWC3_DCFG1);
		reg &= ~DWC3_DCFG1_DIS_MST_ENH;
		dwc3_writel(dwc->regs, DWC3_DCFG1, reg);
	}

	/* Start with SuperSpeed Default */
	dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);

	dep = dwc->eps[0];
	dep->flags = 0;
	ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
	if (ret) {
		dev_err(dwc->dev, "failed to enable %s\n", dep->name);
		goto err0;
	}

	dep = dwc->eps[1];
	dep->flags = 0;
	ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
	if (ret) {
		dev_err(dwc->dev, "failed to enable %s\n", dep->name);
		goto err1;
	}

	/* begin to receive SETUP packets */
	dwc->ep0state = EP0_SETUP_PHASE;
	dwc->ep0_bounced = false;
	dwc->link_state = DWC3_LINK_STATE_SS_DIS;
	dwc->delayed_status = false;
	dwc3_ep0_out_start(dwc);

	dwc3_gadget_enable_irq(dwc);

	return 0;

err1:
	__dwc3_gadget_ep_disable(dwc->eps[0]);

err0:
	return ret;
}

static int dwc3_gadget_start(struct usb_gadget *g,
		struct usb_gadget_driver *driver)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	unsigned long		flags;
	int			ret;
	int			irq;

	irq = dwc->irq_gadget;
	ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
			IRQF_SHARED, "dwc3", dwc->ev_buf);
	if (ret) {
		dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
				irq, ret);
		return ret;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	dwc->gadget_driver	= driver;
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static void __dwc3_gadget_stop(struct dwc3 *dwc)
{
	dwc3_gadget_disable_irq(dwc);
	__dwc3_gadget_ep_disable(dwc->eps[0]);
	__dwc3_gadget_ep_disable(dwc->eps[1]);
}

static int dwc3_gadget_stop(struct usb_gadget *g)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	unsigned long		flags;

	spin_lock_irqsave(&dwc->lock, flags);
	dwc->gadget_driver	= NULL;
	dwc->max_cfg_eps = 0;
	spin_unlock_irqrestore(&dwc->lock, flags);

	free_irq(dwc->irq_gadget, dwc->ev_buf);

	return 0;
}

static void dwc3_gadget_config_params(struct usb_gadget *g,
				      struct usb_dcd_config_params *params)
{
	struct dwc3		*dwc = gadget_to_dwc(g);

	params->besl_baseline = USB_DEFAULT_BESL_UNSPECIFIED;
	params->besl_deep = USB_DEFAULT_BESL_UNSPECIFIED;

	/* Recommended BESL */
	if (!dwc->dis_enblslpm_quirk) {
		/*
		 * If the recommended BESL baseline is 0 or if the BESL deep is
		 * less than 2, Microsoft's Windows 10 host usb stack will issue
		 * a usb reset immediately after it receives the extended BOS
		 * descriptor and the enumeration will fail. To maintain
		 * compatibility with the Windows' usb stack, let's set the
		 * recommended BESL baseline to 1 and clamp the BESL deep to be
		 * within 2 to 15.
		 */
		params->besl_baseline = 1;
		if (dwc->is_utmi_l1_suspend)
			params->besl_deep =
				clamp_t(u8, dwc->hird_threshold, 2, 15);
	}

	/* U1 Device exit Latency */
	if (dwc->dis_u1_entry_quirk)
		params->bU1devExitLat = 0;
	else
		params->bU1devExitLat = DWC3_DEFAULT_U1_DEV_EXIT_LAT;

	/* U2 Device exit Latency */
	if (dwc->dis_u2_entry_quirk)
		params->bU2DevExitLat = 0;
	else
		params->bU2DevExitLat =
				cpu_to_le16(DWC3_DEFAULT_U2_DEV_EXIT_LAT);
}

static void dwc3_gadget_set_speed(struct usb_gadget *g,
				  enum usb_device_speed speed)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	unsigned long		flags;

	spin_lock_irqsave(&dwc->lock, flags);
	dwc->gadget_max_speed = speed;
	spin_unlock_irqrestore(&dwc->lock, flags);
}

static void dwc3_gadget_set_ssp_rate(struct usb_gadget *g,
				     enum usb_ssp_rate rate)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	unsigned long		flags;

	spin_lock_irqsave(&dwc->lock, flags);
	dwc->gadget_max_speed = USB_SPEED_SUPER_PLUS;
	dwc->gadget_ssp_rate = rate;
	spin_unlock_irqrestore(&dwc->lock, flags);
}

static int dwc3_gadget_vbus_draw(struct usb_gadget *g, unsigned int mA)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	union power_supply_propval	val = {0};
	int				ret;

	if (dwc->usb2_phy)
		return usb_phy_set_power(dwc->usb2_phy, mA);

	if (!dwc->usb_psy)
		return -EOPNOTSUPP;

	val.intval = 1000 * mA;
	ret = power_supply_set_property(dwc->usb_psy, POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);

	return ret;
}

/**
 * dwc3_gadget_check_config - ensure dwc3 can support the USB configuration
 * @g: pointer to the USB gadget
 *
 * Used to record the maximum number of endpoints being used in a USB composite
 * device. (across all configurations)  This is to be used in the calculation
 * of the TXFIFO sizes when resizing internal memory for individual endpoints.
 * It will help ensured that the resizing logic reserves enough space for at
 * least one max packet.
 */
static int dwc3_gadget_check_config(struct usb_gadget *g)
{
	struct dwc3 *dwc = gadget_to_dwc(g);
	struct usb_ep *ep;
	int fifo_size = 0;
	int ram1_depth;
	int ep_num = 0;

	if (!dwc->do_fifo_resize)
		return 0;

	list_for_each_entry(ep, &g->ep_list, ep_list) {
		/* Only interested in the IN endpoints */
		if (ep->claimed && (ep->address & USB_DIR_IN))
			ep_num++;
	}

	if (ep_num <= dwc->max_cfg_eps)
		return 0;

	/* Update the max number of eps in the composition */
	dwc->max_cfg_eps = ep_num;

	fifo_size = dwc3_gadget_calc_tx_fifo_size(dwc, dwc->max_cfg_eps);
	/* Based on the equation, increment by one for every ep */
	fifo_size += dwc->max_cfg_eps;

	/* Check if we can fit a single fifo per endpoint */
	ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
	if (fifo_size > ram1_depth)
		return -ENOMEM;

	return 0;
}

static void dwc3_gadget_async_callbacks(struct usb_gadget *g, bool enable)
{
	struct dwc3		*dwc = gadget_to_dwc(g);
	unsigned long		flags;

	spin_lock_irqsave(&dwc->lock, flags);
	dwc->async_callbacks = enable;
	spin_unlock_irqrestore(&dwc->lock, flags);
}

static const struct usb_gadget_ops dwc3_gadget_ops = {
	.get_frame		= dwc3_gadget_get_frame,
	.wakeup			= dwc3_gadget_wakeup,
	.func_wakeup		= dwc3_gadget_func_wakeup,
	.set_remote_wakeup	= dwc3_gadget_set_remote_wakeup,
	.set_selfpowered	= dwc3_gadget_set_selfpowered,
	.pullup			= dwc3_gadget_pullup,
	.udc_start		= dwc3_gadget_start,
	.udc_stop		= dwc3_gadget_stop,
	.udc_set_speed		= dwc3_gadget_set_speed,
	.udc_set_ssp_rate	= dwc3_gadget_set_ssp_rate,
	.get_config_params	= dwc3_gadget_config_params,
	.vbus_draw		= dwc3_gadget_vbus_draw,
	.check_config		= dwc3_gadget_check_config,
	.udc_async_callbacks	= dwc3_gadget_async_callbacks,
};

/* -------------------------------------------------------------------------- */

static int dwc3_gadget_init_control_endpoint(struct dwc3_ep *dep)
{
	struct dwc3 *dwc = dep->dwc;

	usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
	dep->endpoint.maxburst = 1;
	dep->endpoint.ops = &dwc3_gadget_ep0_ops;
	if (!dep->direction)
		dwc->gadget->ep0 = &dep->endpoint;

	dep->endpoint.caps.type_control = true;

	return 0;
}

static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
{
	struct dwc3 *dwc = dep->dwc;
	u32 mdwidth;
	int size;
	int maxpacket;

	mdwidth = dwc3_mdwidth(dwc);

	/* MDWIDTH is represented in bits, we need it in bytes */
	mdwidth /= 8;

	size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1));
	if (DWC3_IP_IS(DWC3))
		size = DWC3_GTXFIFOSIZ_TXFDEP(size);
	else
		size = DWC31_GTXFIFOSIZ_TXFDEP(size);

	/*
	 * maxpacket size is determined as part of the following, after assuming
	 * a mult value of one maxpacket:
	 * DWC3 revision 280A and prior:
	 * fifo_size = mult * (max_packet / mdwidth) + 1;
	 * maxpacket = mdwidth * (fifo_size - 1);
	 *
	 * DWC3 revision 290A and onwards:
	 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
	 * maxpacket = mdwidth * ((fifo_size - 1) - 1) - mdwidth;
	 */
	if (DWC3_VER_IS_PRIOR(DWC3, 290A))
		maxpacket = mdwidth * (size - 1);
	else
		maxpacket = mdwidth * ((size - 1) - 1) - mdwidth;

	/* Functionally, space for one max packet is sufficient */
	size = min_t(int, maxpacket, 1024);
	usb_ep_set_maxpacket_limit(&dep->endpoint, size);

	dep->endpoint.max_streams = 16;
	dep->endpoint.ops = &dwc3_gadget_ep_ops;
	list_add_tail(&dep->endpoint.ep_list,
			&dwc->gadget->ep_list);
	dep->endpoint.caps.type_iso = true;
	dep->endpoint.caps.type_bulk = true;
	dep->endpoint.caps.type_int = true;

	return dwc3_alloc_trb_pool(dep);
}

static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep)
{
	struct dwc3 *dwc = dep->dwc;
	u32 mdwidth;
	int size;

	mdwidth = dwc3_mdwidth(dwc);

	/* MDWIDTH is represented in bits, convert to bytes */
	mdwidth /= 8;

	/* All OUT endpoints share a single RxFIFO space */
	size = dwc3_readl(dwc->regs, DWC3_GRXFIFOSIZ(0));
	if (DWC3_IP_IS(DWC3))
		size = DWC3_GRXFIFOSIZ_RXFDEP(size);
	else
		size = DWC31_GRXFIFOSIZ_RXFDEP(size);

	/* FIFO depth is in MDWDITH bytes */
	size *= mdwidth;

	/*
	 * To meet performance requirement, a minimum recommended RxFIFO size
	 * is defined as follow:
	 * RxFIFO size >= (3 x MaxPacketSize) +
	 * (3 x 8 bytes setup packets size) + (16 bytes clock crossing margin)
	 *
	 * Then calculate the max packet limit as below.
	 */
	size -= (3 * 8) + 16;
	if (size < 0)
		size = 0;
	else
		size /= 3;

	usb_ep_set_maxpacket_limit(&dep->endpoint, size);
	dep->endpoint.max_streams = 16;
	dep->endpoint.ops = &dwc3_gadget_ep_ops;
	list_add_tail(&dep->endpoint.ep_list,
			&dwc->gadget->ep_list);
	dep->endpoint.caps.type_iso = true;
	dep->endpoint.caps.type_bulk = true;
	dep->endpoint.caps.type_int = true;

	return dwc3_alloc_trb_pool(dep);
}

static int dwc3_gadget_init_endpoint(struct dwc3 *dwc, u8 epnum)
{
	struct dwc3_ep			*dep;
	bool				direction = epnum & 1;
	int				ret;
	u8				num = epnum >> 1;

	dep = kzalloc(sizeof(*dep), GFP_KERNEL);
	if (!dep)
		return -ENOMEM;

	dep->dwc = dwc;
	dep->number = epnum;
	dep->direction = direction;
	dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
	dwc->eps[epnum] = dep;
	dep->combo_num = 0;
	dep->start_cmd_status = 0;

	snprintf(dep->name, sizeof(dep->name), "ep%u%s", num,
			direction ? "in" : "out");

	dep->endpoint.name = dep->name;

	if (!(dep->number > 1)) {
		dep->endpoint.desc = &dwc3_gadget_ep0_desc;
		dep->endpoint.comp_desc = NULL;
	}

	if (num == 0)
		ret = dwc3_gadget_init_control_endpoint(dep);
	else if (direction)
		ret = dwc3_gadget_init_in_endpoint(dep);
	else
		ret = dwc3_gadget_init_out_endpoint(dep);

	if (ret)
		return ret;

	dep->endpoint.caps.dir_in = direction;
	dep->endpoint.caps.dir_out = !direction;

	INIT_LIST_HEAD(&dep->pending_list);
	INIT_LIST_HEAD(&dep->started_list);
	INIT_LIST_HEAD(&dep->cancelled_list);

	dwc3_debugfs_create_endpoint_dir(dep);

	return 0;
}

static int dwc3_gadget_init_endpoints(struct dwc3 *dwc, u8 total)
{
	u8				epnum;

	INIT_LIST_HEAD(&dwc->gadget->ep_list);

	for (epnum = 0; epnum < total; epnum++) {
		int			ret;

		ret = dwc3_gadget_init_endpoint(dwc, epnum);
		if (ret)
			return ret;
	}

	return 0;
}

static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
{
	struct dwc3_ep			*dep;
	u8				epnum;

	for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
		dep = dwc->eps[epnum];
		if (!dep)
			continue;
		/*
		 * Physical endpoints 0 and 1 are special; they form the
		 * bi-directional USB endpoint 0.
		 *
		 * For those two physical endpoints, we don't allocate a TRB
		 * pool nor do we add them the endpoints list. Due to that, we
		 * shouldn't do these two operations otherwise we would end up
		 * with all sorts of bugs when removing dwc3.ko.
		 */
		if (epnum != 0 && epnum != 1) {
			dwc3_free_trb_pool(dep);
			list_del(&dep->endpoint.ep_list);
		}

		dwc3_debugfs_remove_endpoint_dir(dep);
		kfree(dep);
	}
}

/* -------------------------------------------------------------------------- */

static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
		struct dwc3_request *req, struct dwc3_trb *trb,
		const struct dwc3_event_depevt *event, int status, int chain)
{
	unsigned int		count;

	dwc3_ep_inc_deq(dep);

	trace_dwc3_complete_trb(dep, trb);
	req->num_trbs--;

	/*
	 * If we're in the middle of series of chained TRBs and we
	 * receive a short transfer along the way, DWC3 will skip
	 * through all TRBs including the last TRB in the chain (the
	 * where CHN bit is zero. DWC3 will also avoid clearing HWO
	 * bit and SW has to do it manually.
	 *
	 * We're going to do that here to avoid problems of HW trying
	 * to use bogus TRBs for transfers.
	 */
	if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
		trb->ctrl &= ~DWC3_TRB_CTRL_HWO;

	/*
	 * For isochronous transfers, the first TRB in a service interval must
	 * have the Isoc-First type. Track and report its interval frame number.
	 */
	if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
	    (trb->ctrl & DWC3_TRBCTL_ISOCHRONOUS_FIRST)) {
		unsigned int frame_number;

		frame_number = DWC3_TRB_CTRL_GET_SID_SOFN(trb->ctrl);
		frame_number &= ~(dep->interval - 1);
		req->request.frame_number = frame_number;
	}

	/*
	 * We use bounce buffer for requests that needs extra TRB or OUT ZLP. If
	 * this TRB points to the bounce buffer address, it's a MPS alignment
	 * TRB. Don't add it to req->remaining calculation.
	 */
	if (trb->bpl == lower_32_bits(dep->dwc->bounce_addr) &&
	    trb->bph == upper_32_bits(dep->dwc->bounce_addr)) {
		trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
		return 1;
	}

	count = trb->size & DWC3_TRB_SIZE_MASK;
	req->remaining += count;

	if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
		return 1;

	if (event->status & DEPEVT_STATUS_SHORT && !chain)
		return 1;

	if ((trb->ctrl & DWC3_TRB_CTRL_ISP_IMI) &&
	    DWC3_TRB_SIZE_TRBSTS(trb->size) == DWC3_TRBSTS_MISSED_ISOC)
		return 1;

	if ((trb->ctrl & DWC3_TRB_CTRL_IOC) ||
	    (trb->ctrl & DWC3_TRB_CTRL_LST))
		return 1;

	return 0;
}

static int dwc3_gadget_ep_reclaim_trb_sg(struct dwc3_ep *dep,
		struct dwc3_request *req, const struct dwc3_event_depevt *event,
		int status)
{
	struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
	struct scatterlist *sg = req->sg;
	struct scatterlist *s;
	unsigned int num_queued = req->num_queued_sgs;
	unsigned int i;
	int ret = 0;

	for_each_sg(sg, s, num_queued, i) {
		trb = &dep->trb_pool[dep->trb_dequeue];

		req->sg = sg_next(s);
		req->num_queued_sgs--;

		ret = dwc3_gadget_ep_reclaim_completed_trb(dep, req,
				trb, event, status, true);
		if (ret)
			break;
	}

	return ret;
}

static int dwc3_gadget_ep_reclaim_trb_linear(struct dwc3_ep *dep,
		struct dwc3_request *req, const struct dwc3_event_depevt *event,
		int status)
{
	struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];

	return dwc3_gadget_ep_reclaim_completed_trb(dep, req, trb,
			event, status, false);
}

static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req)
{
	return req->num_pending_sgs == 0 && req->num_queued_sgs == 0;
}

static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
		const struct dwc3_event_depevt *event,
		struct dwc3_request *req, int status)
{
	int request_status;
	int ret;

	if (req->request.num_mapped_sgs)
		ret = dwc3_gadget_ep_reclaim_trb_sg(dep, req, event,
				status);
	else
		ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
				status);

	req->request.actual = req->request.length - req->remaining;

	if (!dwc3_gadget_ep_request_completed(req))
		goto out;

	if (req->needs_extra_trb) {
		ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
				status);
		req->needs_extra_trb = false;
	}

	/*
	 * The event status only reflects the status of the TRB with IOC set.
	 * For the requests that don't set interrupt on completion, the driver
	 * needs to check and return the status of the completed TRBs associated
	 * with the request. Use the status of the last TRB of the request.
	 */
	if (req->request.no_interrupt) {
		struct dwc3_trb *trb;

		trb = dwc3_ep_prev_trb(dep, dep->trb_dequeue);
		switch (DWC3_TRB_SIZE_TRBSTS(trb->size)) {
		case DWC3_TRBSTS_MISSED_ISOC:
			/* Isoc endpoint only */
			request_status = -EXDEV;
			break;
		case DWC3_TRB_STS_XFER_IN_PROG:
			/* Applicable when End Transfer with ForceRM=0 */
		case DWC3_TRBSTS_SETUP_PENDING:
			/* Control endpoint only */
		case DWC3_TRBSTS_OK:
		default:
			request_status = 0;
			break;
		}
	} else {
		request_status = status;
	}

	dwc3_gadget_giveback(dep, req, request_status);

out:
	return ret;
}

static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
		const struct dwc3_event_depevt *event, int status)
{
	struct dwc3_request	*req;

	while (!list_empty(&dep->started_list)) {
		int ret;

		req = next_request(&dep->started_list);
		ret = dwc3_gadget_ep_cleanup_completed_request(dep, event,
				req, status);
		if (ret)
			break;
		/*
		 * The endpoint is disabled, let the dwc3_remove_requests()
		 * handle the cleanup.
		 */
		if (!dep->endpoint.desc)
			break;
	}
}

static bool dwc3_gadget_ep_should_continue(struct dwc3_ep *dep)
{
	struct dwc3_request	*req;
	struct dwc3		*dwc = dep->dwc;

	if (!dep->endpoint.desc || !dwc->pullups_connected ||
	    !dwc->connected)
		return false;

	if (!list_empty(&dep->pending_list))
		return true;

	/*
	 * We only need to check the first entry of the started list. We can
	 * assume the completed requests are removed from the started list.
	 */
	req = next_request(&dep->started_list);
	if (!req)
		return false;

	return !dwc3_gadget_ep_request_completed(req);
}

static void dwc3_gadget_endpoint_frame_from_event(struct dwc3_ep *dep,
		const struct dwc3_event_depevt *event)
{
	dep->frame_number = event->parameters;
}

static bool dwc3_gadget_endpoint_trbs_complete(struct dwc3_ep *dep,
		const struct dwc3_event_depevt *event, int status)
{
	struct dwc3		*dwc = dep->dwc;
	bool			no_started_trb = true;

	dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);

	if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
		goto out;

	if (!dep->endpoint.desc)
		return no_started_trb;

	if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
		list_empty(&dep->started_list) &&
		(list_empty(&dep->pending_list) || status == -EXDEV))
		dwc3_stop_active_transfer(dep, true, true);
	else if (dwc3_gadget_ep_should_continue(dep))
		if (__dwc3_gadget_kick_transfer(dep) == 0)
			no_started_trb = false;

out:
	/*
	 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
	 * See dwc3_gadget_linksts_change_interrupt() for 1st half.
	 */
	if (DWC3_VER_IS_PRIOR(DWC3, 183A)) {
		u32		reg;
		int		i;

		for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
			dep = dwc->eps[i];

			if (!(dep->flags & DWC3_EP_ENABLED))
				continue;

			if (!list_empty(&dep->started_list))
				return no_started_trb;
		}

		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
		reg |= dwc->u1u2;
		dwc3_writel(dwc->regs, DWC3_DCTL, reg);

		dwc->u1u2 = 0;
	}

	return no_started_trb;
}

static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
		const struct dwc3_event_depevt *event)
{
	int status = 0;

	if (!dep->endpoint.desc)
		return;

	if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
		dwc3_gadget_endpoint_frame_from_event(dep, event);

	if (event->status & DEPEVT_STATUS_BUSERR)
		status = -ECONNRESET;

	if (event->status & DEPEVT_STATUS_MISSED_ISOC)
		status = -EXDEV;

	dwc3_gadget_endpoint_trbs_complete(dep, event, status);
}

static void dwc3_gadget_endpoint_transfer_complete(struct dwc3_ep *dep,
		const struct dwc3_event_depevt *event)
{
	int status = 0;

	dep->flags &= ~DWC3_EP_TRANSFER_STARTED;

	if (event->status & DEPEVT_STATUS_BUSERR)
		status = -ECONNRESET;

	if (dwc3_gadget_endpoint_trbs_complete(dep, event, status))
		dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE;
}

static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
		const struct dwc3_event_depevt *event)
{
	dwc3_gadget_endpoint_frame_from_event(dep, event);

	/*
	 * The XferNotReady event is generated only once before the endpoint
	 * starts. It will be generated again when END_TRANSFER command is
	 * issued. For some controller versions, the XferNotReady event may be
	 * generated while the END_TRANSFER command is still in process. Ignore
	 * it and wait for the next XferNotReady event after the command is
	 * completed.
	 */
	if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
		return;

	(void) __dwc3_gadget_start_isoc(dep);
}

static void dwc3_gadget_endpoint_command_complete(struct dwc3_ep *dep,
		const struct dwc3_event_depevt *event)
{
	u8 cmd = DEPEVT_PARAMETER_CMD(event->parameters);

	if (cmd != DWC3_DEPCMD_ENDTRANSFER)
		return;

	/*
	 * The END_TRANSFER command will cause the controller to generate a
	 * NoStream Event, and it's not due to the host DP NoStream rejection.
	 * Ignore the next NoStream event.
	 */
	if (dep->stream_capable)
		dep->flags |= DWC3_EP_IGNORE_NEXT_NOSTREAM;

	dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
	dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
	dwc3_gadget_ep_cleanup_cancelled_requests(dep);

	if (dep->flags & DWC3_EP_PENDING_CLEAR_STALL) {
		struct dwc3 *dwc = dep->dwc;

		dep->flags &= ~DWC3_EP_PENDING_CLEAR_STALL;
		if (dwc3_send_clear_stall_ep_cmd(dep)) {
			struct usb_ep *ep0 = &dwc->eps[0]->endpoint;

			dev_err(dwc->dev, "failed to clear STALL on %s\n", dep->name);
			if (dwc->delayed_status)
				__dwc3_gadget_ep0_set_halt(ep0, 1);
			return;
		}

		dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
		if (dwc->clear_stall_protocol == dep->number)
			dwc3_ep0_send_delayed_status(dwc);
	}

	if ((dep->flags & DWC3_EP_DELAY_START) &&
	    !usb_endpoint_xfer_isoc(dep->endpoint.desc))
		__dwc3_gadget_kick_transfer(dep);

	dep->flags &= ~DWC3_EP_DELAY_START;
}

static void dwc3_gadget_endpoint_stream_event(struct dwc3_ep *dep,
		const struct dwc3_event_depevt *event)
{
	struct dwc3 *dwc = dep->dwc;

	if (event->status == DEPEVT_STREAMEVT_FOUND) {
		dep->flags |= DWC3_EP_FIRST_STREAM_PRIMED;
		goto out;
	}

	/* Note: NoStream rejection event param value is 0 and not 0xFFFF */
	switch (event->parameters) {
	case DEPEVT_STREAM_PRIME:
		/*
		 * If the host can properly transition the endpoint state from
		 * idle to prime after a NoStream rejection, there's no need to
		 * force restarting the endpoint to reinitiate the stream. To
		 * simplify the check, assume the host follows the USB spec if
		 * it primed the endpoint more than once.
		 */
		if (dep->flags & DWC3_EP_FORCE_RESTART_STREAM) {
			if (dep->flags & DWC3_EP_FIRST_STREAM_PRIMED)
				dep->flags &= ~DWC3_EP_FORCE_RESTART_STREAM;
			else
				dep->flags |= DWC3_EP_FIRST_STREAM_PRIMED;
		}

		break;
	case DEPEVT_STREAM_NOSTREAM:
		if ((dep->flags & DWC3_EP_IGNORE_NEXT_NOSTREAM) ||
		    !(dep->flags & DWC3_EP_FORCE_RESTART_STREAM) ||
		    (!DWC3_MST_CAPABLE(&dwc->hwparams) &&
		     !(dep->flags & DWC3_EP_WAIT_TRANSFER_COMPLETE)))
			break;

		/*
		 * If the host rejects a stream due to no active stream, by the
		 * USB and xHCI spec, the endpoint will be put back to idle
		 * state. When the host is ready (buffer added/updated), it will
		 * prime the endpoint to inform the usb device controller. This
		 * triggers the device controller to issue ERDY to restart the
		 * stream. However, some hosts don't follow this and keep the
		 * endpoint in the idle state. No prime will come despite host
		 * streams are updated, and the device controller will not be
		 * triggered to generate ERDY to move the next stream data. To
		 * workaround this and maintain compatibility with various
		 * hosts, force to reinitiate the stream until the host is ready
		 * instead of waiting for the host to prime the endpoint.
		 */
		if (DWC3_VER_IS_WITHIN(DWC32, 100A, ANY)) {
			unsigned int cmd = DWC3_DGCMD_SET_ENDPOINT_PRIME;

			dwc3_send_gadget_generic_command(dwc, cmd, dep->number);
		} else {
			dep->flags |= DWC3_EP_DELAY_START;
			dwc3_stop_active_transfer(dep, true, true);
			return;
		}
		break;
	}

out:
	dep->flags &= ~DWC3_EP_IGNORE_NEXT_NOSTREAM;
}

static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
		const struct dwc3_event_depevt *event)
{
	struct dwc3_ep		*dep;
	u8			epnum = event->endpoint_number;

	dep = dwc->eps[epnum];

	if (!(dep->flags & DWC3_EP_ENABLED)) {
		if ((epnum > 1) && !(dep->flags & DWC3_EP_TRANSFER_STARTED))
			return;

		/* Handle only EPCMDCMPLT when EP disabled */
		if ((event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT) &&
			!(epnum <= 1 && event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE))
			return;
	}

	if (epnum == 0 || epnum == 1) {
		dwc3_ep0_interrupt(dwc, event);
		return;
	}

	switch (event->endpoint_event) {
	case DWC3_DEPEVT_XFERINPROGRESS:
		dwc3_gadget_endpoint_transfer_in_progress(dep, event);
		break;
	case DWC3_DEPEVT_XFERNOTREADY:
		dwc3_gadget_endpoint_transfer_not_ready(dep, event);
		break;
	case DWC3_DEPEVT_EPCMDCMPLT:
		dwc3_gadget_endpoint_command_complete(dep, event);
		break;
	case DWC3_DEPEVT_XFERCOMPLETE:
		dwc3_gadget_endpoint_transfer_complete(dep, event);
		break;
	case DWC3_DEPEVT_STREAMEVT:
		dwc3_gadget_endpoint_stream_event(dep, event);
		break;
	case DWC3_DEPEVT_RXTXFIFOEVT:
		break;
	default:
		dev_err(dwc->dev, "unknown endpoint event %d\n", event->endpoint_event);
		break;
	}
}

static void dwc3_disconnect_gadget(struct dwc3 *dwc)
{
	if (dwc->async_callbacks && dwc->gadget_driver->disconnect) {
		spin_unlock(&dwc->lock);
		dwc->gadget_driver->disconnect(dwc->gadget);
		spin_lock(&dwc->lock);
	}
}

static void dwc3_suspend_gadget(struct dwc3 *dwc)
{
	if (dwc->async_callbacks && dwc->gadget_driver->suspend) {
		spin_unlock(&dwc->lock);
		dwc->gadget_driver->suspend(dwc->gadget);
		spin_lock(&dwc->lock);
	}
}

static void dwc3_resume_gadget(struct dwc3 *dwc)
{
	if (dwc->async_callbacks && dwc->gadget_driver->resume) {
		spin_unlock(&dwc->lock);
		dwc->gadget_driver->resume(dwc->gadget);
		spin_lock(&dwc->lock);
	}
}

static void dwc3_reset_gadget(struct dwc3 *dwc)
{
	if (!dwc->gadget_driver)
		return;

	if (dwc->async_callbacks && dwc->gadget->speed != USB_SPEED_UNKNOWN) {
		spin_unlock(&dwc->lock);
		usb_gadget_udc_reset(dwc->gadget, dwc->gadget_driver);
		spin_lock(&dwc->lock);
	}
}

void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
	bool interrupt)
{
	struct dwc3 *dwc = dep->dwc;

	/*
	 * Only issue End Transfer command to the control endpoint of a started
	 * Data Phase. Typically we should only do so in error cases such as
	 * invalid/unexpected direction as described in the control transfer
	 * flow of the programming guide.
	 */
	if (dep->number <= 1 && dwc->ep0state != EP0_DATA_PHASE)
		return;

	if (interrupt && (dep->flags & DWC3_EP_DELAY_STOP))
		return;

	if (!(dep->flags & DWC3_EP_TRANSFER_STARTED) ||
	    (dep->flags & DWC3_EP_END_TRANSFER_PENDING))
		return;

	/*
	 * If a Setup packet is received but yet to DMA out, the controller will
	 * not process the End Transfer command of any endpoint. Polling of its
	 * DEPCMD.CmdAct may block setting up TRB for Setup packet, causing a
	 * timeout. Delay issuing the End Transfer command until the Setup TRB is
	 * prepared.
	 */
	if (dwc->ep0state != EP0_SETUP_PHASE && !dwc->delayed_status) {
		dep->flags |= DWC3_EP_DELAY_STOP;
		return;
	}

	/*
	 * NOTICE: We are violating what the Databook says about the
	 * EndTransfer command. Ideally we would _always_ wait for the
	 * EndTransfer Command Completion IRQ, but that's causing too
	 * much trouble synchronizing between us and gadget driver.
	 *
	 * We have discussed this with the IP Provider and it was
	 * suggested to giveback all requests here.
	 *
	 * Note also that a similar handling was tested by Synopsys
	 * (thanks a lot Paul) and nothing bad has come out of it.
	 * In short, what we're doing is issuing EndTransfer with
	 * CMDIOC bit set and delay kicking transfer until the
	 * EndTransfer command had completed.
	 *
	 * As of IP version 3.10a of the DWC_usb3 IP, the controller
	 * supports a mode to work around the above limitation. The
	 * software can poll the CMDACT bit in the DEPCMD register
	 * after issuing a EndTransfer command. This mode is enabled
	 * by writing GUCTL2[14]. This polling is already done in the
	 * dwc3_send_gadget_ep_cmd() function so if the mode is
	 * enabled, the EndTransfer command will have completed upon
	 * returning from this function.
	 *
	 * This mode is NOT available on the DWC_usb31 IP.  In this
	 * case, if the IOC bit is not set, then delay by 1ms
	 * after issuing the EndTransfer command.  This allows for the
	 * controller to handle the command completely before DWC3
	 * remove requests attempts to unmap USB request buffers.
	 */

	__dwc3_stop_active_transfer(dep, force, interrupt);
}

static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
{
	u32 epnum;

	for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
		struct dwc3_ep *dep;
		int ret;

		dep = dwc->eps[epnum];
		if (!dep)
			continue;

		if (!(dep->flags & DWC3_EP_STALL))
			continue;

		dep->flags &= ~DWC3_EP_STALL;

		ret = dwc3_send_clear_stall_ep_cmd(dep);
		WARN_ON_ONCE(ret);
	}
}

static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
{
	int			reg;

	dwc->suspended = false;

	dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RX_DET);

	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
	reg &= ~DWC3_DCTL_INITU1ENA;
	reg &= ~DWC3_DCTL_INITU2ENA;
	dwc3_gadget_dctl_write_safe(dwc, reg);

	dwc->connected = false;

	dwc3_disconnect_gadget(dwc);

	dwc->gadget->speed = USB_SPEED_UNKNOWN;
	dwc->setup_packet_pending = false;
	dwc->gadget->wakeup_armed = false;
	dwc3_gadget_enable_linksts_evts(dwc, false);
	usb_gadget_set_state(dwc->gadget, USB_STATE_NOTATTACHED);

	dwc3_ep0_reset_state(dwc);

	/*
	 * Request PM idle to address condition where usage count is
	 * already decremented to zero, but waiting for the disconnect
	 * interrupt to set dwc->connected to FALSE.
	 */
	pm_request_idle(dwc->dev);
}

static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
{
	u32			reg;

	dwc->suspended = false;

	/*
	 * Ideally, dwc3_reset_gadget() would trigger the function
	 * drivers to stop any active transfers through ep disable.
	 * However, for functions which defer ep disable, such as mass
	 * storage, we will need to rely on the call to stop active
	 * transfers here, and avoid allowing of request queuing.
	 */
	dwc->connected = false;

	/*
	 * WORKAROUND: DWC3 revisions <1.88a have an issue which
	 * would cause a missing Disconnect Event if there's a
	 * pending Setup Packet in the FIFO.
	 *
	 * There's no suggested workaround on the official Bug
	 * report, which states that "unless the driver/application
	 * is doing any special handling of a disconnect event,
	 * there is no functional issue".
	 *
	 * Unfortunately, it turns out that we _do_ some special
	 * handling of a disconnect event, namely complete all
	 * pending transfers, notify gadget driver of the
	 * disconnection, and so on.
	 *
	 * Our suggested workaround is to follow the Disconnect
	 * Event steps here, instead, based on a setup_packet_pending
	 * flag. Such flag gets set whenever we have a SETUP_PENDING
	 * status for EP0 TRBs and gets cleared on XferComplete for the
	 * same endpoint.
	 *
	 * Refers to:
	 *
	 * STAR#9000466709: RTL: Device : Disconnect event not
	 * generated if setup packet pending in FIFO
	 */
	if (DWC3_VER_IS_PRIOR(DWC3, 188A)) {
		if (dwc->setup_packet_pending)
			dwc3_gadget_disconnect_interrupt(dwc);
	}

	dwc3_reset_gadget(dwc);

	/*
	 * From SNPS databook section 8.1.2, the EP0 should be in setup
	 * phase. So ensure that EP0 is in setup phase by issuing a stall
	 * and restart if EP0 is not in setup phase.
	 */
	dwc3_ep0_reset_state(dwc);

	/*
	 * In the Synopsis DesignWare Cores USB3 Databook Rev. 3.30a
	 * Section 4.1.2 Table 4-2, it states that during a USB reset, the SW
	 * needs to ensure that it sends "a DEPENDXFER command for any active
	 * transfers."
	 */
	dwc3_stop_active_transfers(dwc);
	dwc->connected = true;

	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
	reg &= ~DWC3_DCTL_TSTCTRL_MASK;
	dwc3_gadget_dctl_write_safe(dwc, reg);
	dwc->test_mode = false;
	dwc->gadget->wakeup_armed = false;
	dwc3_gadget_enable_linksts_evts(dwc, false);
	dwc3_clear_stall_all_ep(dwc);

	/* Reset device address to zero */
	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
	reg &= ~(DWC3_DCFG_DEVADDR_MASK);
	dwc3_writel(dwc->regs, DWC3_DCFG, reg);
}

static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
{
	struct dwc3_ep		*dep;
	int			ret;
	u32			reg;
	u8			lanes = 1;
	u8			speed;

	if (!dwc->softconnect)
		return;

	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
	speed = reg & DWC3_DSTS_CONNECTSPD;
	dwc->speed = speed;

	if (DWC3_IP_IS(DWC32))
		lanes = DWC3_DSTS_CONNLANES(reg) + 1;

	dwc->gadget->ssp_rate = USB_SSP_GEN_UNKNOWN;

	/*
	 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
	 * each time on Connect Done.
	 *
	 * Currently we always use the reset value. If any platform
	 * wants to set this to a different value, we need to add a
	 * setting and update GCTL.RAMCLKSEL here.
	 */

	switch (speed) {
	case DWC3_DSTS_SUPERSPEED_PLUS:
		dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
		dwc->gadget->ep0->maxpacket = 512;
		dwc->gadget->speed = USB_SPEED_SUPER_PLUS;

		if (lanes > 1)
			dwc->gadget->ssp_rate = USB_SSP_GEN_2x2;
		else
			dwc->gadget->ssp_rate = USB_SSP_GEN_2x1;
		break;
	case DWC3_DSTS_SUPERSPEED:
		/*
		 * WORKAROUND: DWC3 revisions <1.90a have an issue which
		 * would cause a missing USB3 Reset event.
		 *
		 * In such situations, we should force a USB3 Reset
		 * event by calling our dwc3_gadget_reset_interrupt()
		 * routine.
		 *
		 * Refers to:
		 *
		 * STAR#9000483510: RTL: SS : USB3 reset event may
		 * not be generated always when the link enters poll
		 */
		if (DWC3_VER_IS_PRIOR(DWC3, 190A))
			dwc3_gadget_reset_interrupt(dwc);

		dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
		dwc->gadget->ep0->maxpacket = 512;
		dwc->gadget->speed = USB_SPEED_SUPER;

		if (lanes > 1) {
			dwc->gadget->speed = USB_SPEED_SUPER_PLUS;
			dwc->gadget->ssp_rate = USB_SSP_GEN_1x2;
		}
		break;
	case DWC3_DSTS_HIGHSPEED:
		dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
		dwc->gadget->ep0->maxpacket = 64;
		dwc->gadget->speed = USB_SPEED_HIGH;
		break;
	case DWC3_DSTS_FULLSPEED:
		dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
		dwc->gadget->ep0->maxpacket = 64;
		dwc->gadget->speed = USB_SPEED_FULL;
		break;
	}

	dwc->eps[1]->endpoint.maxpacket = dwc->gadget->ep0->maxpacket;

	/* Enable USB2 LPM Capability */

	if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A) &&
	    !dwc->usb2_gadget_lpm_disable &&
	    (speed != DWC3_DSTS_SUPERSPEED) &&
	    (speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
		reg = dwc3_readl(dwc->regs, DWC3_DCFG);
		reg |= DWC3_DCFG_LPM_CAP;
		dwc3_writel(dwc->regs, DWC3_DCFG, reg);

		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
		reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);

		reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold |
					    (dwc->is_utmi_l1_suspend << 4));

		/*
		 * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
		 * DCFG.LPMCap is set, core responses with an ACK and the
		 * BESL value in the LPM token is less than or equal to LPM
		 * NYET threshold.
		 */
		WARN_ONCE(DWC3_VER_IS_PRIOR(DWC3, 240A) && dwc->has_lpm_erratum,
				"LPM Erratum not available on dwc3 revisions < 2.40a\n");

		if (dwc->has_lpm_erratum && !DWC3_VER_IS_PRIOR(DWC3, 240A))
			reg |= DWC3_DCTL_NYET_THRES(dwc->lpm_nyet_threshold);

		dwc3_gadget_dctl_write_safe(dwc, reg);
	} else {
		if (dwc->usb2_gadget_lpm_disable) {
			reg = dwc3_readl(dwc->regs, DWC3_DCFG);
			reg &= ~DWC3_DCFG_LPM_CAP;
			dwc3_writel(dwc->regs, DWC3_DCFG, reg);
		}

		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
		reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
		dwc3_gadget_dctl_write_safe(dwc, reg);
	}

	dep = dwc->eps[0];
	ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
	if (ret) {
		dev_err(dwc->dev, "failed to enable %s\n", dep->name);
		return;
	}

	dep = dwc->eps[1];
	ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
	if (ret) {
		dev_err(dwc->dev, "failed to enable %s\n", dep->name);
		return;
	}

	/*
	 * Configure PHY via GUSB3PIPECTLn if required.
	 *
	 * Update GTXFIFOSIZn
	 *
	 * In both cases reset values should be sufficient.
	 */
}

static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc, unsigned int evtinfo)
{
	dwc->suspended = false;

	/*
	 * TODO take core out of low power mode when that's
	 * implemented.
	 */

	if (dwc->async_callbacks && dwc->gadget_driver->resume) {
		spin_unlock(&dwc->lock);
		dwc->gadget_driver->resume(dwc->gadget);
		spin_lock(&dwc->lock);
	}

	dwc->link_state = evtinfo & DWC3_LINK_STATE_MASK;
}

static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
		unsigned int evtinfo)
{
	enum dwc3_link_state	next = evtinfo & DWC3_LINK_STATE_MASK;
	unsigned int		pwropt;

	/*
	 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
	 * Hibernation mode enabled which would show up when device detects
	 * host-initiated U3 exit.
	 *
	 * In that case, device will generate a Link State Change Interrupt
	 * from U3 to RESUME which is only necessary if Hibernation is
	 * configured in.
	 *
	 * There are no functional changes due to such spurious event and we
	 * just need to ignore it.
	 *
	 * Refers to:
	 *
	 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
	 * operational mode
	 */
	pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
	if (DWC3_VER_IS_PRIOR(DWC3, 250A) &&
			(pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
		if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
				(next == DWC3_LINK_STATE_RESUME)) {
			return;
		}
	}

	/*
	 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
	 * on the link partner, the USB session might do multiple entry/exit
	 * of low power states before a transfer takes place.
	 *
	 * Due to this problem, we might experience lower throughput. The
	 * suggested workaround is to disable DCTL[12:9] bits if we're
	 * transitioning from U1/U2 to U0 and enable those bits again
	 * after a transfer completes and there are no pending transfers
	 * on any of the enabled endpoints.
	 *
	 * This is the first half of that workaround.
	 *
	 * Refers to:
	 *
	 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
	 * core send LGO_Ux entering U0
	 */
	if (DWC3_VER_IS_PRIOR(DWC3, 183A)) {
		if (next == DWC3_LINK_STATE_U0) {
			u32	u1u2;
			u32	reg;

			switch (dwc->link_state) {
			case DWC3_LINK_STATE_U1:
			case DWC3_LINK_STATE_U2:
				reg = dwc3_readl(dwc->regs, DWC3_DCTL);
				u1u2 = reg & (DWC3_DCTL_INITU2ENA
						| DWC3_DCTL_ACCEPTU2ENA
						| DWC3_DCTL_INITU1ENA
						| DWC3_DCTL_ACCEPTU1ENA);

				if (!dwc->u1u2)
					dwc->u1u2 = reg & u1u2;

				reg &= ~u1u2;

				dwc3_gadget_dctl_write_safe(dwc, reg);
				break;
			default:
				/* do nothing */
				break;
			}
		}
	}

	switch (next) {
	case DWC3_LINK_STATE_U0:
		if (dwc->gadget->wakeup_armed) {
			dwc3_gadget_enable_linksts_evts(dwc, false);
			dwc3_resume_gadget(dwc);
			dwc->suspended = false;
		}
		break;
	case DWC3_LINK_STATE_U1:
		if (dwc->speed == USB_SPEED_SUPER)
			dwc3_suspend_gadget(dwc);
		break;
	case DWC3_LINK_STATE_U2:
	case DWC3_LINK_STATE_U3:
		dwc3_suspend_gadget(dwc);
		break;
	case DWC3_LINK_STATE_RESUME:
		dwc3_resume_gadget(dwc);
		break;
	default:
		/* do nothing */
		break;
	}

	dwc->link_state = next;
}

static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
					  unsigned int evtinfo)
{
	enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;

	if (!dwc->suspended && next == DWC3_LINK_STATE_U3) {
		dwc->suspended = true;
		dwc3_suspend_gadget(dwc);
	}

	dwc->link_state = next;
}

static void dwc3_gadget_interrupt(struct dwc3 *dwc,
		const struct dwc3_event_devt *event)
{
	switch (event->type) {
	case DWC3_DEVICE_EVENT_DISCONNECT:
		dwc3_gadget_disconnect_interrupt(dwc);
		break;
	case DWC3_DEVICE_EVENT_RESET:
		dwc3_gadget_reset_interrupt(dwc);
		break;
	case DWC3_DEVICE_EVENT_CONNECT_DONE:
		dwc3_gadget_conndone_interrupt(dwc);
		break;
	case DWC3_DEVICE_EVENT_WAKEUP:
		dwc3_gadget_wakeup_interrupt(dwc, event->event_info);
		break;
	case DWC3_DEVICE_EVENT_HIBER_REQ:
		dev_WARN_ONCE(dwc->dev, true, "unexpected hibernation event\n");
		break;
	case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
		dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
		break;
	case DWC3_DEVICE_EVENT_SUSPEND:
		/* It changed to be suspend event for version 2.30a and above */
		if (!DWC3_VER_IS_PRIOR(DWC3, 230A))
			dwc3_gadget_suspend_interrupt(dwc, event->event_info);
		break;
	case DWC3_DEVICE_EVENT_SOF:
	case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
	case DWC3_DEVICE_EVENT_CMD_CMPL:
	case DWC3_DEVICE_EVENT_OVERFLOW:
		break;
	default:
		dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
	}
}

static void dwc3_process_event_entry(struct dwc3 *dwc,
		const union dwc3_event *event)
{
	trace_dwc3_event(event->raw, dwc);

	if (!event->type.is_devspec)
		dwc3_endpoint_interrupt(dwc, &event->depevt);
	else if (event->type.type == DWC3_EVENT_TYPE_DEV)
		dwc3_gadget_interrupt(dwc, &event->devt);
	else
		dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
}

static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
{
	struct dwc3 *dwc = evt->dwc;
	irqreturn_t ret = IRQ_NONE;
	int left;

	left = evt->count;

	if (!(evt->flags & DWC3_EVENT_PENDING))
		return IRQ_NONE;

	while (left > 0) {
		union dwc3_event event;

		event.raw = *(u32 *) (evt->cache + evt->lpos);

		dwc3_process_event_entry(dwc, &event);

		/*
		 * FIXME we wrap around correctly to the next entry as
		 * almost all entries are 4 bytes in size. There is one
		 * entry which has 12 bytes which is a regular entry
		 * followed by 8 bytes data. ATM I don't know how
		 * things are organized if we get next to the a
		 * boundary so I worry about that once we try to handle
		 * that.
		 */
		evt->lpos = (evt->lpos + 4) % evt->length;
		left -= 4;
	}

	evt->count = 0;
	ret = IRQ_HANDLED;

	/* Unmask interrupt */
	dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
		    DWC3_GEVNTSIZ_SIZE(evt->length));

	if (dwc->imod_interval) {
		dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
		dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
	}

	/* Keep the clearing of DWC3_EVENT_PENDING at the end */
	evt->flags &= ~DWC3_EVENT_PENDING;

	return ret;
}

static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
{
	struct dwc3_event_buffer *evt = _evt;
	struct dwc3 *dwc = evt->dwc;
	unsigned long flags;
	irqreturn_t ret = IRQ_NONE;

	local_bh_disable();
	spin_lock_irqsave(&dwc->lock, flags);
	ret = dwc3_process_event_buf(evt);
	spin_unlock_irqrestore(&dwc->lock, flags);
	local_bh_enable();

	return ret;
}

static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
{
	struct dwc3 *dwc = evt->dwc;
	u32 amount;
	u32 count;

	if (pm_runtime_suspended(dwc->dev)) {
		dwc->pending_events = true;
		/*
		 * Trigger runtime resume. The get() function will be balanced
		 * after processing the pending events in dwc3_process_pending
		 * events().
		 */
		pm_runtime_get(dwc->dev);
		disable_irq_nosync(dwc->irq_gadget);
		return IRQ_HANDLED;
	}

	/*
	 * With PCIe legacy interrupt, test shows that top-half irq handler can
	 * be called again after HW interrupt deassertion. Check if bottom-half
	 * irq event handler completes before caching new event to prevent
	 * losing events.
	 */
	if (evt->flags & DWC3_EVENT_PENDING)
		return IRQ_HANDLED;

	count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
	count &= DWC3_GEVNTCOUNT_MASK;
	if (!count)
		return IRQ_NONE;

	evt->count = count;
	evt->flags |= DWC3_EVENT_PENDING;

	/* Mask interrupt */
	dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
		    DWC3_GEVNTSIZ_INTMASK | DWC3_GEVNTSIZ_SIZE(evt->length));

	amount = min(count, evt->length - evt->lpos);
	memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount);

	if (amount < count)
		memcpy(evt->cache, evt->buf, count - amount);

	dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count);

	return IRQ_WAKE_THREAD;
}

static irqreturn_t dwc3_interrupt(int irq, void *_evt)
{
	struct dwc3_event_buffer	*evt = _evt;

	return dwc3_check_event_buf(evt);
}

static int dwc3_gadget_get_irq(struct dwc3 *dwc)
{
	struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
	int irq;

	irq = platform_get_irq_byname_optional(dwc3_pdev, "peripheral");
	if (irq > 0)
		goto out;

	if (irq == -EPROBE_DEFER)
		goto out;

	irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
	if (irq > 0)
		goto out;

	if (irq == -EPROBE_DEFER)
		goto out;

	irq = platform_get_irq(dwc3_pdev, 0);

out:
	return irq;
}

static void dwc_gadget_release(struct device *dev)
{
	struct usb_gadget *gadget = container_of(dev, struct usb_gadget, dev);

	kfree(gadget);
}

/**
 * dwc3_gadget_init - initializes gadget related registers
 * @dwc: pointer to our controller context structure
 *
 * Returns 0 on success otherwise negative errno.
 */
int dwc3_gadget_init(struct dwc3 *dwc)
{
	int ret;
	int irq;
	struct device *dev;

	irq = dwc3_gadget_get_irq(dwc);
	if (irq < 0) {
		ret = irq;
		goto err0;
	}

	dwc->irq_gadget = irq;

	dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
					  sizeof(*dwc->ep0_trb) * 2,
					  &dwc->ep0_trb_addr, GFP_KERNEL);
	if (!dwc->ep0_trb) {
		dev_err(dwc->dev, "failed to allocate ep0 trb\n");
		ret = -ENOMEM;
		goto err0;
	}

	dwc->setup_buf = kzalloc(DWC3_EP0_SETUP_SIZE, GFP_KERNEL);
	if (!dwc->setup_buf) {
		ret = -ENOMEM;
		goto err1;
	}

	dwc->bounce = dma_alloc_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE,
			&dwc->bounce_addr, GFP_KERNEL);
	if (!dwc->bounce) {
		ret = -ENOMEM;
		goto err2;
	}

	init_completion(&dwc->ep0_in_setup);
	dwc->gadget = kzalloc(sizeof(struct usb_gadget), GFP_KERNEL);
	if (!dwc->gadget) {
		ret = -ENOMEM;
		goto err3;
	}


	usb_initialize_gadget(dwc->dev, dwc->gadget, dwc_gadget_release);
	dev				= &dwc->gadget->dev;
	dev->platform_data		= dwc;
	dwc->gadget->ops		= &dwc3_gadget_ops;
	dwc->gadget->speed		= USB_SPEED_UNKNOWN;
	dwc->gadget->ssp_rate		= USB_SSP_GEN_UNKNOWN;
	dwc->gadget->sg_supported	= true;
	dwc->gadget->name		= "dwc3-gadget";
	dwc->gadget->lpm_capable	= !dwc->usb2_gadget_lpm_disable;
	dwc->gadget->wakeup_capable	= true;

	/*
	 * FIXME We might be setting max_speed to <SUPER, however versions
	 * <2.20a of dwc3 have an issue with metastability (documented
	 * elsewhere in this driver) which tells us we can't set max speed to
	 * anything lower than SUPER.
	 *
	 * Because gadget.max_speed is only used by composite.c and function
	 * drivers (i.e. it won't go into dwc3's registers) we are allowing this
	 * to happen so we avoid sending SuperSpeed Capability descriptor
	 * together with our BOS descriptor as that could confuse host into
	 * thinking we can handle super speed.
	 *
	 * Note that, in fact, we won't even support GetBOS requests when speed
	 * is less than super speed because we don't have means, yet, to tell
	 * composite.c that we are USB 2.0 + LPM ECN.
	 */
	if (DWC3_VER_IS_PRIOR(DWC3, 220A) &&
	    !dwc->dis_metastability_quirk)
		dev_info(dwc->dev, "changing max_speed on rev %08x\n",
				dwc->revision);

	dwc->gadget->max_speed		= dwc->maximum_speed;
	dwc->gadget->max_ssp_rate	= dwc->max_ssp_rate;

	/*
	 * REVISIT: Here we should clear all pending IRQs to be
	 * sure we're starting from a well known location.
	 */

	ret = dwc3_gadget_init_endpoints(dwc, dwc->num_eps);
	if (ret)
		goto err4;

	ret = usb_add_gadget(dwc->gadget);
	if (ret) {
		dev_err(dwc->dev, "failed to add gadget\n");
		goto err5;
	}

	if (DWC3_IP_IS(DWC32) && dwc->maximum_speed == USB_SPEED_SUPER_PLUS)
		dwc3_gadget_set_ssp_rate(dwc->gadget, dwc->max_ssp_rate);
	else
		dwc3_gadget_set_speed(dwc->gadget, dwc->maximum_speed);

	return 0;

err5:
	dwc3_gadget_free_endpoints(dwc);
err4:
	usb_put_gadget(dwc->gadget);
	dwc->gadget = NULL;
err3:
	dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
			dwc->bounce_addr);

err2:
	kfree(dwc->setup_buf);

err1:
	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
			dwc->ep0_trb, dwc->ep0_trb_addr);

err0:
	return ret;
}

/* -------------------------------------------------------------------------- */

void dwc3_gadget_exit(struct dwc3 *dwc)
{
	if (!dwc->gadget)
		return;

	usb_del_gadget(dwc->gadget);
	dwc3_gadget_free_endpoints(dwc);
	usb_put_gadget(dwc->gadget);
	dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
			  dwc->bounce_addr);
	kfree(dwc->setup_buf);
	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
			  dwc->ep0_trb, dwc->ep0_trb_addr);
}

int dwc3_gadget_suspend(struct dwc3 *dwc)
{
	unsigned long flags;
	int ret;

	ret = dwc3_gadget_soft_disconnect(dwc);
	if (ret)
		goto err;

	spin_lock_irqsave(&dwc->lock, flags);
	if (dwc->gadget_driver)
		dwc3_disconnect_gadget(dwc);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;

err:
	/*
	 * Attempt to reset the controller's state. Likely no
	 * communication can be established until the host
	 * performs a port reset.
	 */
	if (dwc->softconnect)
		dwc3_gadget_soft_connect(dwc);

	return ret;
}

int dwc3_gadget_resume(struct dwc3 *dwc)
{
	if (!dwc->gadget_driver || !dwc->softconnect)
		return 0;

	return dwc3_gadget_soft_connect(dwc);
}

void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
{
	if (dwc->pending_events) {
		dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
		dwc3_thread_interrupt(dwc->irq_gadget, dwc->ev_buf);
		pm_runtime_put(dwc->dev);
		dwc->pending_events = false;
		enable_irq(dwc->irq_gadget);
	}
}