summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/fotg210-hcd.c
blob: 3d1dbcf4c07326ff39a09fe1b25f7a9363e4bfc8 (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
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
// SPDX-License-Identifier: GPL-2.0+
/* Faraday FOTG210 EHCI-like driver
 *
 * Copyright (c) 2013 Faraday Technology Corporation
 *
 * Author: Yuan-Hsin Chen <yhchen@faraday-tech.com>
 *	   Feng-Hsin Chiang <john453@faraday-tech.com>
 *	   Po-Yu Chuang <ratbert.chuang@gmail.com>
 *
 * Most of code borrowed from the Linux-3.7 EHCI driver
 */
#include <linux/module.h>
#include <linux/of.h>
#include <linux/device.h>
#include <linux/dmapool.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/hrtimer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/clk.h>

#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/unaligned.h>

#define DRIVER_AUTHOR "Yuan-Hsin Chen"
#define DRIVER_DESC "FOTG210 Host Controller (EHCI) Driver"
static const char hcd_name[] = "fotg210_hcd";

#undef FOTG210_URB_TRACE
#define FOTG210_STATS

/* magic numbers that can affect system performance */
#define FOTG210_TUNE_CERR	3 /* 0-3 qtd retries; 0 == don't stop */
#define FOTG210_TUNE_RL_HS	4 /* nak throttle; see 4.9 */
#define FOTG210_TUNE_RL_TT	0
#define FOTG210_TUNE_MULT_HS	1 /* 1-3 transactions/uframe; 4.10.3 */
#define FOTG210_TUNE_MULT_TT	1

/* Some drivers think it's safe to schedule isochronous transfers more than 256
 * ms into the future (partly as a result of an old bug in the scheduling
 * code).  In an attempt to avoid trouble, we will use a minimum scheduling
 * length of 512 frames instead of 256.
 */
#define FOTG210_TUNE_FLS 1 /* (medium) 512-frame schedule */

/* Initial IRQ latency:  faster than hw default */
static int log2_irq_thresh; /* 0 to 6 */
module_param(log2_irq_thresh, int, S_IRUGO);
MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");

/* initial park setting:  slower than hw default */
static unsigned park;
module_param(park, uint, S_IRUGO);
MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets");

/* for link power management(LPM) feature */
static unsigned int hird;
module_param(hird, int, S_IRUGO);
MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");

#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)

#include "fotg210.h"

#define fotg210_dbg(fotg210, fmt, args...) \
	dev_dbg(fotg210_to_hcd(fotg210)->self.controller, fmt, ## args)
#define fotg210_err(fotg210, fmt, args...) \
	dev_err(fotg210_to_hcd(fotg210)->self.controller, fmt, ## args)
#define fotg210_info(fotg210, fmt, args...) \
	dev_info(fotg210_to_hcd(fotg210)->self.controller, fmt, ## args)
#define fotg210_warn(fotg210, fmt, args...) \
	dev_warn(fotg210_to_hcd(fotg210)->self.controller, fmt, ## args)

/* check the values in the HCSPARAMS register (host controller _Structural_
 * parameters) see EHCI spec, Table 2-4 for each value
 */
static void dbg_hcs_params(struct fotg210_hcd *fotg210, char *label)
{
	u32 params = fotg210_readl(fotg210, &fotg210->caps->hcs_params);

	fotg210_dbg(fotg210, "%s hcs_params 0x%x ports=%d\n", label, params,
			HCS_N_PORTS(params));
}

/* check the values in the HCCPARAMS register (host controller _Capability_
 * parameters) see EHCI Spec, Table 2-5 for each value
 */
static void dbg_hcc_params(struct fotg210_hcd *fotg210, char *label)
{
	u32 params = fotg210_readl(fotg210, &fotg210->caps->hcc_params);

	fotg210_dbg(fotg210, "%s hcc_params %04x uframes %s%s\n", label,
			params,
			HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
			HCC_CANPARK(params) ? " park" : "");
}

static void __maybe_unused
dbg_qtd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd)
{
	fotg210_dbg(fotg210, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
			hc32_to_cpup(fotg210, &qtd->hw_next),
			hc32_to_cpup(fotg210, &qtd->hw_alt_next),
			hc32_to_cpup(fotg210, &qtd->hw_token),
			hc32_to_cpup(fotg210, &qtd->hw_buf[0]));
	if (qtd->hw_buf[1])
		fotg210_dbg(fotg210, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
				hc32_to_cpup(fotg210, &qtd->hw_buf[1]),
				hc32_to_cpup(fotg210, &qtd->hw_buf[2]),
				hc32_to_cpup(fotg210, &qtd->hw_buf[3]),
				hc32_to_cpup(fotg210, &qtd->hw_buf[4]));
}

static void __maybe_unused
dbg_qh(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
{
	struct fotg210_qh_hw *hw = qh->hw;

	fotg210_dbg(fotg210, "%s qh %p n%08x info %x %x qtd %x\n", label, qh,
			hw->hw_next, hw->hw_info1, hw->hw_info2,
			hw->hw_current);

	dbg_qtd("overlay", fotg210, (struct fotg210_qtd *) &hw->hw_qtd_next);
}

static void __maybe_unused
dbg_itd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_itd *itd)
{
	fotg210_dbg(fotg210, "%s[%d] itd %p, next %08x, urb %p\n", label,
			itd->frame, itd, hc32_to_cpu(fotg210, itd->hw_next),
			itd->urb);

	fotg210_dbg(fotg210,
			"  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
			hc32_to_cpu(fotg210, itd->hw_transaction[0]),
			hc32_to_cpu(fotg210, itd->hw_transaction[1]),
			hc32_to_cpu(fotg210, itd->hw_transaction[2]),
			hc32_to_cpu(fotg210, itd->hw_transaction[3]),
			hc32_to_cpu(fotg210, itd->hw_transaction[4]),
			hc32_to_cpu(fotg210, itd->hw_transaction[5]),
			hc32_to_cpu(fotg210, itd->hw_transaction[6]),
			hc32_to_cpu(fotg210, itd->hw_transaction[7]));

	fotg210_dbg(fotg210,
			"  buf:   %08x %08x %08x %08x %08x %08x %08x\n",
			hc32_to_cpu(fotg210, itd->hw_bufp[0]),
			hc32_to_cpu(fotg210, itd->hw_bufp[1]),
			hc32_to_cpu(fotg210, itd->hw_bufp[2]),
			hc32_to_cpu(fotg210, itd->hw_bufp[3]),
			hc32_to_cpu(fotg210, itd->hw_bufp[4]),
			hc32_to_cpu(fotg210, itd->hw_bufp[5]),
			hc32_to_cpu(fotg210, itd->hw_bufp[6]));

	fotg210_dbg(fotg210, "  index: %d %d %d %d %d %d %d %d\n",
			itd->index[0], itd->index[1], itd->index[2],
			itd->index[3], itd->index[4], itd->index[5],
			itd->index[6], itd->index[7]);
}

static int __maybe_unused
dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
{
	return scnprintf(buf, len, "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
			label, label[0] ? " " : "", status,
			(status & STS_ASS) ? " Async" : "",
			(status & STS_PSS) ? " Periodic" : "",
			(status & STS_RECL) ? " Recl" : "",
			(status & STS_HALT) ? " Halt" : "",
			(status & STS_IAA) ? " IAA" : "",
			(status & STS_FATAL) ? " FATAL" : "",
			(status & STS_FLR) ? " FLR" : "",
			(status & STS_PCD) ? " PCD" : "",
			(status & STS_ERR) ? " ERR" : "",
			(status & STS_INT) ? " INT" : "");
}

static int __maybe_unused
dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
{
	return scnprintf(buf, len, "%s%sintrenable %02x%s%s%s%s%s%s",
			label, label[0] ? " " : "", enable,
			(enable & STS_IAA) ? " IAA" : "",
			(enable & STS_FATAL) ? " FATAL" : "",
			(enable & STS_FLR) ? " FLR" : "",
			(enable & STS_PCD) ? " PCD" : "",
			(enable & STS_ERR) ? " ERR" : "",
			(enable & STS_INT) ? " INT" : "");
}

static const char *const fls_strings[] = { "1024", "512", "256", "??" };

static int dbg_command_buf(char *buf, unsigned len, const char *label,
		u32 command)
{
	return scnprintf(buf, len,
			"%s%scommand %07x %s=%d ithresh=%d%s%s%s period=%s%s %s",
			label, label[0] ? " " : "", command,
			(command & CMD_PARK) ? " park" : "(park)",
			CMD_PARK_CNT(command),
			(command >> 16) & 0x3f,
			(command & CMD_IAAD) ? " IAAD" : "",
			(command & CMD_ASE) ? " Async" : "",
			(command & CMD_PSE) ? " Periodic" : "",
			fls_strings[(command >> 2) & 0x3],
			(command & CMD_RESET) ? " Reset" : "",
			(command & CMD_RUN) ? "RUN" : "HALT");
}

static char *dbg_port_buf(char *buf, unsigned len, const char *label, int port,
		u32 status)
{
	char *sig;

	/* signaling state */
	switch (status & (3 << 10)) {
	case 0 << 10:
		sig = "se0";
		break;
	case 1 << 10:
		sig = "k";
		break; /* low speed */
	case 2 << 10:
		sig = "j";
		break;
	default:
		sig = "?";
		break;
	}

	scnprintf(buf, len, "%s%sport:%d status %06x %d sig=%s%s%s%s%s%s%s%s",
			label, label[0] ? " " : "", port, status,
			status >> 25, /*device address */
			sig,
			(status & PORT_RESET) ? " RESET" : "",
			(status & PORT_SUSPEND) ? " SUSPEND" : "",
			(status & PORT_RESUME) ? " RESUME" : "",
			(status & PORT_PEC) ? " PEC" : "",
			(status & PORT_PE) ? " PE" : "",
			(status & PORT_CSC) ? " CSC" : "",
			(status & PORT_CONNECT) ? " CONNECT" : "");

	return buf;
}

/* functions have the "wrong" filename when they're output... */
#define dbg_status(fotg210, label, status) {			\
	char _buf[80];						\
	dbg_status_buf(_buf, sizeof(_buf), label, status);	\
	fotg210_dbg(fotg210, "%s\n", _buf);			\
}

#define dbg_cmd(fotg210, label, command) {			\
	char _buf[80];						\
	dbg_command_buf(_buf, sizeof(_buf), label, command);	\
	fotg210_dbg(fotg210, "%s\n", _buf);			\
}

#define dbg_port(fotg210, label, port, status) {			       \
	char _buf[80];							       \
	fotg210_dbg(fotg210, "%s\n",					       \
			dbg_port_buf(_buf, sizeof(_buf), label, port, status));\
}

/* troubleshooting help: expose state in debugfs */
static int debug_async_open(struct inode *, struct file *);
static int debug_periodic_open(struct inode *, struct file *);
static int debug_registers_open(struct inode *, struct file *);
static int debug_async_open(struct inode *, struct file *);

static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
static int debug_close(struct inode *, struct file *);

static const struct file_operations debug_async_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_async_open,
	.read		= debug_output,
	.release	= debug_close,
	.llseek		= default_llseek,
};
static const struct file_operations debug_periodic_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_periodic_open,
	.read		= debug_output,
	.release	= debug_close,
	.llseek		= default_llseek,
};
static const struct file_operations debug_registers_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_registers_open,
	.read		= debug_output,
	.release	= debug_close,
	.llseek		= default_llseek,
};

static struct dentry *fotg210_debug_root;

struct debug_buffer {
	ssize_t (*fill_func)(struct debug_buffer *);	/* fill method */
	struct usb_bus *bus;
	struct mutex mutex;	/* protect filling of buffer */
	size_t count;		/* number of characters filled into buffer */
	char *output_buf;
	size_t alloc_size;
};

static inline char speed_char(u32 scratch)
{
	switch (scratch & (3 << 12)) {
	case QH_FULL_SPEED:
		return 'f';

	case QH_LOW_SPEED:
		return 'l';

	case QH_HIGH_SPEED:
		return 'h';

	default:
		return '?';
	}
}

static inline char token_mark(struct fotg210_hcd *fotg210, __hc32 token)
{
	__u32 v = hc32_to_cpu(fotg210, token);

	if (v & QTD_STS_ACTIVE)
		return '*';
	if (v & QTD_STS_HALT)
		return '-';
	if (!IS_SHORT_READ(v))
		return ' ';
	/* tries to advance through hw_alt_next */
	return '/';
}

static void qh_lines(struct fotg210_hcd *fotg210, struct fotg210_qh *qh,
		char **nextp, unsigned *sizep)
{
	u32 scratch;
	u32 hw_curr;
	struct fotg210_qtd *td;
	unsigned temp;
	unsigned size = *sizep;
	char *next = *nextp;
	char mark;
	__le32 list_end = FOTG210_LIST_END(fotg210);
	struct fotg210_qh_hw *hw = qh->hw;

	if (hw->hw_qtd_next == list_end) /* NEC does this */
		mark = '@';
	else
		mark = token_mark(fotg210, hw->hw_token);
	if (mark == '/') { /* qh_alt_next controls qh advance? */
		if ((hw->hw_alt_next & QTD_MASK(fotg210)) ==
		    fotg210->async->hw->hw_alt_next)
			mark = '#'; /* blocked */
		else if (hw->hw_alt_next == list_end)
			mark = '.'; /* use hw_qtd_next */
		/* else alt_next points to some other qtd */
	}
	scratch = hc32_to_cpup(fotg210, &hw->hw_info1);
	hw_curr = (mark == '*') ? hc32_to_cpup(fotg210, &hw->hw_current) : 0;
	temp = scnprintf(next, size,
			"qh/%p dev%d %cs ep%d %08x %08x(%08x%c %s nak%d)",
			qh, scratch & 0x007f,
			speed_char(scratch),
			(scratch >> 8) & 0x000f,
			scratch, hc32_to_cpup(fotg210, &hw->hw_info2),
			hc32_to_cpup(fotg210, &hw->hw_token), mark,
			(cpu_to_hc32(fotg210, QTD_TOGGLE) & hw->hw_token)
				? "data1" : "data0",
			(hc32_to_cpup(fotg210, &hw->hw_alt_next) >> 1) & 0x0f);
	size -= temp;
	next += temp;

	/* hc may be modifying the list as we read it ... */
	list_for_each_entry(td, &qh->qtd_list, qtd_list) {
		scratch = hc32_to_cpup(fotg210, &td->hw_token);
		mark = ' ';
		if (hw_curr == td->qtd_dma)
			mark = '*';
		else if (hw->hw_qtd_next == cpu_to_hc32(fotg210, td->qtd_dma))
			mark = '+';
		else if (QTD_LENGTH(scratch)) {
			if (td->hw_alt_next == fotg210->async->hw->hw_alt_next)
				mark = '#';
			else if (td->hw_alt_next != list_end)
				mark = '/';
		}
		temp = snprintf(next, size,
				"\n\t%p%c%s len=%d %08x urb %p",
				td, mark, ({ char *tmp;
				switch ((scratch>>8)&0x03) {
				case 0:
					tmp = "out";
					break;
				case 1:
					tmp = "in";
					break;
				case 2:
					tmp = "setup";
					break;
				default:
					tmp = "?";
					break;
				 } tmp; }),
				(scratch >> 16) & 0x7fff,
				scratch,
				td->urb);
		if (size < temp)
			temp = size;
		size -= temp;
		next += temp;
		if (temp == size)
			goto done;
	}

	temp = snprintf(next, size, "\n");
	if (size < temp)
		temp = size;

	size -= temp;
	next += temp;

done:
	*sizep = size;
	*nextp = next;
}

static ssize_t fill_async_buffer(struct debug_buffer *buf)
{
	struct usb_hcd *hcd;
	struct fotg210_hcd *fotg210;
	unsigned long flags;
	unsigned temp, size;
	char *next;
	struct fotg210_qh *qh;

	hcd = bus_to_hcd(buf->bus);
	fotg210 = hcd_to_fotg210(hcd);
	next = buf->output_buf;
	size = buf->alloc_size;

	*next = 0;

	/* dumps a snapshot of the async schedule.
	 * usually empty except for long-term bulk reads, or head.
	 * one QH per line, and TDs we know about
	 */
	spin_lock_irqsave(&fotg210->lock, flags);
	for (qh = fotg210->async->qh_next.qh; size > 0 && qh;
			qh = qh->qh_next.qh)
		qh_lines(fotg210, qh, &next, &size);
	if (fotg210->async_unlink && size > 0) {
		temp = scnprintf(next, size, "\nunlink =\n");
		size -= temp;
		next += temp;

		for (qh = fotg210->async_unlink; size > 0 && qh;
				qh = qh->unlink_next)
			qh_lines(fotg210, qh, &next, &size);
	}
	spin_unlock_irqrestore(&fotg210->lock, flags);

	return strlen(buf->output_buf);
}

/* count tds, get ep direction */
static unsigned output_buf_tds_dir(char *buf, struct fotg210_hcd *fotg210,
		struct fotg210_qh_hw *hw, struct fotg210_qh *qh, unsigned size)
{
	u32 scratch = hc32_to_cpup(fotg210, &hw->hw_info1);
	struct fotg210_qtd *qtd;
	char *type = "";
	unsigned temp = 0;

	/* count tds, get ep direction */
	list_for_each_entry(qtd, &qh->qtd_list, qtd_list) {
		temp++;
		switch ((hc32_to_cpu(fotg210, qtd->hw_token) >> 8) & 0x03) {
		case 0:
			type = "out";
			continue;
		case 1:
			type = "in";
			continue;
		}
	}

	return scnprintf(buf, size, "(%c%d ep%d%s [%d/%d] q%d p%d)",
			speed_char(scratch), scratch & 0x007f,
			(scratch >> 8) & 0x000f, type, qh->usecs,
			qh->c_usecs, temp, (scratch >> 16) & 0x7ff);
}

#define DBG_SCHED_LIMIT 64
static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
{
	struct usb_hcd *hcd;
	struct fotg210_hcd *fotg210;
	unsigned long flags;
	union fotg210_shadow p, *seen;
	unsigned temp, size, seen_count;
	char *next;
	unsigned i;
	__hc32 tag;

	seen = kmalloc_array(DBG_SCHED_LIMIT, sizeof(*seen), GFP_ATOMIC);
	if (!seen)
		return 0;

	seen_count = 0;

	hcd = bus_to_hcd(buf->bus);
	fotg210 = hcd_to_fotg210(hcd);
	next = buf->output_buf;
	size = buf->alloc_size;

	temp = scnprintf(next, size, "size = %d\n", fotg210->periodic_size);
	size -= temp;
	next += temp;

	/* dump a snapshot of the periodic schedule.
	 * iso changes, interrupt usually doesn't.
	 */
	spin_lock_irqsave(&fotg210->lock, flags);
	for (i = 0; i < fotg210->periodic_size; i++) {
		p = fotg210->pshadow[i];
		if (likely(!p.ptr))
			continue;

		tag = Q_NEXT_TYPE(fotg210, fotg210->periodic[i]);

		temp = scnprintf(next, size, "%4d: ", i);
		size -= temp;
		next += temp;

		do {
			struct fotg210_qh_hw *hw;

			switch (hc32_to_cpu(fotg210, tag)) {
			case Q_TYPE_QH:
				hw = p.qh->hw;
				temp = scnprintf(next, size, " qh%d-%04x/%p",
						p.qh->period,
						hc32_to_cpup(fotg210,
							&hw->hw_info2)
							/* uframe masks */
							& (QH_CMASK | QH_SMASK),
						p.qh);
				size -= temp;
				next += temp;
				/* don't repeat what follows this qh */
				for (temp = 0; temp < seen_count; temp++) {
					if (seen[temp].ptr != p.ptr)
						continue;
					if (p.qh->qh_next.ptr) {
						temp = scnprintf(next, size,
								" ...");
						size -= temp;
						next += temp;
					}
					break;
				}
				/* show more info the first time around */
				if (temp == seen_count) {
					temp = output_buf_tds_dir(next,
							fotg210, hw,
							p.qh, size);

					if (seen_count < DBG_SCHED_LIMIT)
						seen[seen_count++].qh = p.qh;
				} else
					temp = 0;
				tag = Q_NEXT_TYPE(fotg210, hw->hw_next);
				p = p.qh->qh_next;
				break;
			case Q_TYPE_FSTN:
				temp = scnprintf(next, size,
						" fstn-%8x/%p",
						p.fstn->hw_prev, p.fstn);
				tag = Q_NEXT_TYPE(fotg210, p.fstn->hw_next);
				p = p.fstn->fstn_next;
				break;
			case Q_TYPE_ITD:
				temp = scnprintf(next, size,
						" itd/%p", p.itd);
				tag = Q_NEXT_TYPE(fotg210, p.itd->hw_next);
				p = p.itd->itd_next;
				break;
			}
			size -= temp;
			next += temp;
		} while (p.ptr);

		temp = scnprintf(next, size, "\n");
		size -= temp;
		next += temp;
	}
	spin_unlock_irqrestore(&fotg210->lock, flags);
	kfree(seen);

	return buf->alloc_size - size;
}
#undef DBG_SCHED_LIMIT

static const char *rh_state_string(struct fotg210_hcd *fotg210)
{
	switch (fotg210->rh_state) {
	case FOTG210_RH_HALTED:
		return "halted";
	case FOTG210_RH_SUSPENDED:
		return "suspended";
	case FOTG210_RH_RUNNING:
		return "running";
	case FOTG210_RH_STOPPING:
		return "stopping";
	}
	return "?";
}

static ssize_t fill_registers_buffer(struct debug_buffer *buf)
{
	struct usb_hcd *hcd;
	struct fotg210_hcd *fotg210;
	unsigned long flags;
	unsigned temp, size, i;
	char *next, scratch[80];
	static const char fmt[] = "%*s\n";
	static const char label[] = "";

	hcd = bus_to_hcd(buf->bus);
	fotg210 = hcd_to_fotg210(hcd);
	next = buf->output_buf;
	size = buf->alloc_size;

	spin_lock_irqsave(&fotg210->lock, flags);

	if (!HCD_HW_ACCESSIBLE(hcd)) {
		size = scnprintf(next, size,
				"bus %s, device %s\n"
				"%s\n"
				"SUSPENDED(no register access)\n",
				hcd->self.controller->bus->name,
				dev_name(hcd->self.controller),
				hcd->product_desc);
		goto done;
	}

	/* Capability Registers */
	i = HC_VERSION(fotg210, fotg210_readl(fotg210,
			&fotg210->caps->hc_capbase));
	temp = scnprintf(next, size,
			"bus %s, device %s\n"
			"%s\n"
			"EHCI %x.%02x, rh state %s\n",
			hcd->self.controller->bus->name,
			dev_name(hcd->self.controller),
			hcd->product_desc,
			i >> 8, i & 0x0ff, rh_state_string(fotg210));
	size -= temp;
	next += temp;

	/* FIXME interpret both types of params */
	i = fotg210_readl(fotg210, &fotg210->caps->hcs_params);
	temp = scnprintf(next, size, "structural params 0x%08x\n", i);
	size -= temp;
	next += temp;

	i = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
	temp = scnprintf(next, size, "capability params 0x%08x\n", i);
	size -= temp;
	next += temp;

	/* Operational Registers */
	temp = dbg_status_buf(scratch, sizeof(scratch), label,
			fotg210_readl(fotg210, &fotg210->regs->status));
	temp = scnprintf(next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = dbg_command_buf(scratch, sizeof(scratch), label,
			fotg210_readl(fotg210, &fotg210->regs->command));
	temp = scnprintf(next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = dbg_intr_buf(scratch, sizeof(scratch), label,
			fotg210_readl(fotg210, &fotg210->regs->intr_enable));
	temp = scnprintf(next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = scnprintf(next, size, "uframe %04x\n",
			fotg210_read_frame_index(fotg210));
	size -= temp;
	next += temp;

	if (fotg210->async_unlink) {
		temp = scnprintf(next, size, "async unlink qh %p\n",
				fotg210->async_unlink);
		size -= temp;
		next += temp;
	}

#ifdef FOTG210_STATS
	temp = scnprintf(next, size,
			"irq normal %ld err %ld iaa %ld(lost %ld)\n",
			fotg210->stats.normal, fotg210->stats.error,
			fotg210->stats.iaa, fotg210->stats.lost_iaa);
	size -= temp;
	next += temp;

	temp = scnprintf(next, size, "complete %ld unlink %ld\n",
			fotg210->stats.complete, fotg210->stats.unlink);
	size -= temp;
	next += temp;
#endif

done:
	spin_unlock_irqrestore(&fotg210->lock, flags);

	return buf->alloc_size - size;
}

static struct debug_buffer
*alloc_buffer(struct usb_bus *bus, ssize_t (*fill_func)(struct debug_buffer *))
{
	struct debug_buffer *buf;

	buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);

	if (buf) {
		buf->bus = bus;
		buf->fill_func = fill_func;
		mutex_init(&buf->mutex);
		buf->alloc_size = PAGE_SIZE;
	}

	return buf;
}

static int fill_buffer(struct debug_buffer *buf)
{
	int ret = 0;

	if (!buf->output_buf)
		buf->output_buf = vmalloc(buf->alloc_size);

	if (!buf->output_buf) {
		ret = -ENOMEM;
		goto out;
	}

	ret = buf->fill_func(buf);

	if (ret >= 0) {
		buf->count = ret;
		ret = 0;
	}

out:
	return ret;
}

static ssize_t debug_output(struct file *file, char __user *user_buf,
		size_t len, loff_t *offset)
{
	struct debug_buffer *buf = file->private_data;
	int ret = 0;

	mutex_lock(&buf->mutex);
	if (buf->count == 0) {
		ret = fill_buffer(buf);
		if (ret != 0) {
			mutex_unlock(&buf->mutex);
			goto out;
		}
	}
	mutex_unlock(&buf->mutex);

	ret = simple_read_from_buffer(user_buf, len, offset,
			buf->output_buf, buf->count);

out:
	return ret;

}

static int debug_close(struct inode *inode, struct file *file)
{
	struct debug_buffer *buf = file->private_data;

	if (buf) {
		vfree(buf->output_buf);
		kfree(buf);
	}

	return 0;
}
static int debug_async_open(struct inode *inode, struct file *file)
{
	file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);

	return file->private_data ? 0 : -ENOMEM;
}

static int debug_periodic_open(struct inode *inode, struct file *file)
{
	struct debug_buffer *buf;

	buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
	if (!buf)
		return -ENOMEM;

	buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
	file->private_data = buf;
	return 0;
}

static int debug_registers_open(struct inode *inode, struct file *file)
{
	file->private_data = alloc_buffer(inode->i_private,
			fill_registers_buffer);

	return file->private_data ? 0 : -ENOMEM;
}

static inline void create_debug_files(struct fotg210_hcd *fotg210)
{
	struct usb_bus *bus = &fotg210_to_hcd(fotg210)->self;
	struct dentry *root;

	root = debugfs_create_dir(bus->bus_name, fotg210_debug_root);

	debugfs_create_file("async", S_IRUGO, root, bus, &debug_async_fops);
	debugfs_create_file("periodic", S_IRUGO, root, bus,
			    &debug_periodic_fops);
	debugfs_create_file("registers", S_IRUGO, root, bus,
			    &debug_registers_fops);
}

static inline void remove_debug_files(struct fotg210_hcd *fotg210)
{
	struct usb_bus *bus = &fotg210_to_hcd(fotg210)->self;

	debugfs_remove(debugfs_lookup(bus->bus_name, fotg210_debug_root));
}

/* handshake - spin reading hc until handshake completes or fails
 * @ptr: address of hc register to be read
 * @mask: bits to look at in result of read
 * @done: value of those bits when handshake succeeds
 * @usec: timeout in microseconds
 *
 * Returns negative errno, or zero on success
 *
 * Success happens when the "mask" bits have the specified value (hardware
 * handshake done).  There are two failure modes:  "usec" have passed (major
 * hardware flakeout), or the register reads as all-ones (hardware removed).
 *
 * That last failure should_only happen in cases like physical cardbus eject
 * before driver shutdown. But it also seems to be caused by bugs in cardbus
 * bridge shutdown:  shutting down the bridge before the devices using it.
 */
static int handshake(struct fotg210_hcd *fotg210, void __iomem *ptr,
		u32 mask, u32 done, int usec)
{
	u32 result;
	int ret;

	ret = readl_poll_timeout_atomic(ptr, result,
					((result & mask) == done ||
					 result == U32_MAX), 1, usec);
	if (result == U32_MAX)		/* card removed */
		return -ENODEV;

	return ret;
}

/* Force HC to halt state from unknown (EHCI spec section 2.3).
 * Must be called with interrupts enabled and the lock not held.
 */
static int fotg210_halt(struct fotg210_hcd *fotg210)
{
	u32 temp;

	spin_lock_irq(&fotg210->lock);

	/* disable any irqs left enabled by previous code */
	fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);

	/*
	 * This routine gets called during probe before fotg210->command
	 * has been initialized, so we can't rely on its value.
	 */
	fotg210->command &= ~CMD_RUN;
	temp = fotg210_readl(fotg210, &fotg210->regs->command);
	temp &= ~(CMD_RUN | CMD_IAAD);
	fotg210_writel(fotg210, temp, &fotg210->regs->command);

	spin_unlock_irq(&fotg210->lock);
	synchronize_irq(fotg210_to_hcd(fotg210)->irq);

	return handshake(fotg210, &fotg210->regs->status,
			STS_HALT, STS_HALT, 16 * 125);
}

/* Reset a non-running (STS_HALT == 1) controller.
 * Must be called with interrupts enabled and the lock not held.
 */
static int fotg210_reset(struct fotg210_hcd *fotg210)
{
	int retval;
	u32 command = fotg210_readl(fotg210, &fotg210->regs->command);

	/* If the EHCI debug controller is active, special care must be
	 * taken before and after a host controller reset
	 */
	if (fotg210->debug && !dbgp_reset_prep(fotg210_to_hcd(fotg210)))
		fotg210->debug = NULL;

	command |= CMD_RESET;
	dbg_cmd(fotg210, "reset", command);
	fotg210_writel(fotg210, command, &fotg210->regs->command);
	fotg210->rh_state = FOTG210_RH_HALTED;
	fotg210->next_statechange = jiffies;
	retval = handshake(fotg210, &fotg210->regs->command,
			CMD_RESET, 0, 250 * 1000);

	if (retval)
		return retval;

	if (fotg210->debug)
		dbgp_external_startup(fotg210_to_hcd(fotg210));

	fotg210->port_c_suspend = fotg210->suspended_ports =
			fotg210->resuming_ports = 0;
	return retval;
}

/* Idle the controller (turn off the schedules).
 * Must be called with interrupts enabled and the lock not held.
 */
static void fotg210_quiesce(struct fotg210_hcd *fotg210)
{
	u32 temp;

	if (fotg210->rh_state != FOTG210_RH_RUNNING)
		return;

	/* wait for any schedule enables/disables to take effect */
	temp = (fotg210->command << 10) & (STS_ASS | STS_PSS);
	handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, temp,
			16 * 125);

	/* then disable anything that's still active */
	spin_lock_irq(&fotg210->lock);
	fotg210->command &= ~(CMD_ASE | CMD_PSE);
	fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
	spin_unlock_irq(&fotg210->lock);

	/* hardware can take 16 microframes to turn off ... */
	handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, 0,
			16 * 125);
}

static void end_unlink_async(struct fotg210_hcd *fotg210);
static void unlink_empty_async(struct fotg210_hcd *fotg210);
static void fotg210_work(struct fotg210_hcd *fotg210);
static void start_unlink_intr(struct fotg210_hcd *fotg210,
			      struct fotg210_qh *qh);
static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);

/* Set a bit in the USBCMD register */
static void fotg210_set_command_bit(struct fotg210_hcd *fotg210, u32 bit)
{
	fotg210->command |= bit;
	fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);

	/* unblock posted write */
	fotg210_readl(fotg210, &fotg210->regs->command);
}

/* Clear a bit in the USBCMD register */
static void fotg210_clear_command_bit(struct fotg210_hcd *fotg210, u32 bit)
{
	fotg210->command &= ~bit;
	fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);

	/* unblock posted write */
	fotg210_readl(fotg210, &fotg210->regs->command);
}

/* EHCI timer support...  Now using hrtimers.
 *
 * Lots of different events are triggered from fotg210->hrtimer.  Whenever
 * the timer routine runs, it checks each possible event; events that are
 * currently enabled and whose expiration time has passed get handled.
 * The set of enabled events is stored as a collection of bitflags in
 * fotg210->enabled_hrtimer_events, and they are numbered in order of
 * increasing delay values (ranging between 1 ms and 100 ms).
 *
 * Rather than implementing a sorted list or tree of all pending events,
 * we keep track only of the lowest-numbered pending event, in
 * fotg210->next_hrtimer_event.  Whenever fotg210->hrtimer gets restarted, its
 * expiration time is set to the timeout value for this event.
 *
 * As a result, events might not get handled right away; the actual delay
 * could be anywhere up to twice the requested delay.  This doesn't
 * matter, because none of the events are especially time-critical.  The
 * ones that matter most all have a delay of 1 ms, so they will be
 * handled after 2 ms at most, which is okay.  In addition to this, we
 * allow for an expiration range of 1 ms.
 */

/* Delay lengths for the hrtimer event types.
 * Keep this list sorted by delay length, in the same order as
 * the event types indexed by enum fotg210_hrtimer_event in fotg210.h.
 */
static unsigned event_delays_ns[] = {
	1 * NSEC_PER_MSEC,	/* FOTG210_HRTIMER_POLL_ASS */
	1 * NSEC_PER_MSEC,	/* FOTG210_HRTIMER_POLL_PSS */
	1 * NSEC_PER_MSEC,	/* FOTG210_HRTIMER_POLL_DEAD */
	1125 * NSEC_PER_USEC,	/* FOTG210_HRTIMER_UNLINK_INTR */
	2 * NSEC_PER_MSEC,	/* FOTG210_HRTIMER_FREE_ITDS */
	6 * NSEC_PER_MSEC,	/* FOTG210_HRTIMER_ASYNC_UNLINKS */
	10 * NSEC_PER_MSEC,	/* FOTG210_HRTIMER_IAA_WATCHDOG */
	10 * NSEC_PER_MSEC,	/* FOTG210_HRTIMER_DISABLE_PERIODIC */
	15 * NSEC_PER_MSEC,	/* FOTG210_HRTIMER_DISABLE_ASYNC */
	100 * NSEC_PER_MSEC,	/* FOTG210_HRTIMER_IO_WATCHDOG */
};

/* Enable a pending hrtimer event */
static void fotg210_enable_event(struct fotg210_hcd *fotg210, unsigned event,
		bool resched)
{
	ktime_t *timeout = &fotg210->hr_timeouts[event];

	if (resched)
		*timeout = ktime_add(ktime_get(), event_delays_ns[event]);
	fotg210->enabled_hrtimer_events |= (1 << event);

	/* Track only the lowest-numbered pending event */
	if (event < fotg210->next_hrtimer_event) {
		fotg210->next_hrtimer_event = event;
		hrtimer_start_range_ns(&fotg210->hrtimer, *timeout,
				NSEC_PER_MSEC, HRTIMER_MODE_ABS);
	}
}


/* Poll the STS_ASS status bit; see when it agrees with CMD_ASE */
static void fotg210_poll_ASS(struct fotg210_hcd *fotg210)
{
	unsigned actual, want;

	/* Don't enable anything if the controller isn't running (e.g., died) */
	if (fotg210->rh_state != FOTG210_RH_RUNNING)
		return;

	want = (fotg210->command & CMD_ASE) ? STS_ASS : 0;
	actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_ASS;

	if (want != actual) {

		/* Poll again later, but give up after about 20 ms */
		if (fotg210->ASS_poll_count++ < 20) {
			fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_ASS,
					true);
			return;
		}
		fotg210_dbg(fotg210, "Waited too long for the async schedule status (%x/%x), giving up\n",
				want, actual);
	}
	fotg210->ASS_poll_count = 0;

	/* The status is up-to-date; restart or stop the schedule as needed */
	if (want == 0) {	/* Stopped */
		if (fotg210->async_count > 0)
			fotg210_set_command_bit(fotg210, CMD_ASE);

	} else {		/* Running */
		if (fotg210->async_count == 0) {

			/* Turn off the schedule after a while */
			fotg210_enable_event(fotg210,
					FOTG210_HRTIMER_DISABLE_ASYNC,
					true);
		}
	}
}

/* Turn off the async schedule after a brief delay */
static void fotg210_disable_ASE(struct fotg210_hcd *fotg210)
{
	fotg210_clear_command_bit(fotg210, CMD_ASE);
}


/* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */
static void fotg210_poll_PSS(struct fotg210_hcd *fotg210)
{
	unsigned actual, want;

	/* Don't do anything if the controller isn't running (e.g., died) */
	if (fotg210->rh_state != FOTG210_RH_RUNNING)
		return;

	want = (fotg210->command & CMD_PSE) ? STS_PSS : 0;
	actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_PSS;

	if (want != actual) {

		/* Poll again later, but give up after about 20 ms */
		if (fotg210->PSS_poll_count++ < 20) {
			fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_PSS,
					true);
			return;
		}
		fotg210_dbg(fotg210, "Waited too long for the periodic schedule status (%x/%x), giving up\n",
				want, actual);
	}
	fotg210->PSS_poll_count = 0;

	/* The status is up-to-date; restart or stop the schedule as needed */
	if (want == 0) {	/* Stopped */
		if (fotg210->periodic_count > 0)
			fotg210_set_command_bit(fotg210, CMD_PSE);

	} else {		/* Running */
		if (fotg210->periodic_count == 0) {

			/* Turn off the schedule after a while */
			fotg210_enable_event(fotg210,
					FOTG210_HRTIMER_DISABLE_PERIODIC,
					true);
		}
	}
}

/* Turn off the periodic schedule after a brief delay */
static void fotg210_disable_PSE(struct fotg210_hcd *fotg210)
{
	fotg210_clear_command_bit(fotg210, CMD_PSE);
}


/* Poll the STS_HALT status bit; see when a dead controller stops */
static void fotg210_handle_controller_death(struct fotg210_hcd *fotg210)
{
	if (!(fotg210_readl(fotg210, &fotg210->regs->status) & STS_HALT)) {

		/* Give up after a few milliseconds */
		if (fotg210->died_poll_count++ < 5) {
			/* Try again later */
			fotg210_enable_event(fotg210,
					FOTG210_HRTIMER_POLL_DEAD, true);
			return;
		}
		fotg210_warn(fotg210, "Waited too long for the controller to stop, giving up\n");
	}

	/* Clean up the mess */
	fotg210->rh_state = FOTG210_RH_HALTED;
	fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);
	fotg210_work(fotg210);
	end_unlink_async(fotg210);

	/* Not in process context, so don't try to reset the controller */
}


/* Handle unlinked interrupt QHs once they are gone from the hardware */
static void fotg210_handle_intr_unlinks(struct fotg210_hcd *fotg210)
{
	bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING);

	/*
	 * Process all the QHs on the intr_unlink list that were added
	 * before the current unlink cycle began.  The list is in
	 * temporal order, so stop when we reach the first entry in the
	 * current cycle.  But if the root hub isn't running then
	 * process all the QHs on the list.
	 */
	fotg210->intr_unlinking = true;
	while (fotg210->intr_unlink) {
		struct fotg210_qh *qh = fotg210->intr_unlink;

		if (!stopped && qh->unlink_cycle == fotg210->intr_unlink_cycle)
			break;
		fotg210->intr_unlink = qh->unlink_next;
		qh->unlink_next = NULL;
		end_unlink_intr(fotg210, qh);
	}

	/* Handle remaining entries later */
	if (fotg210->intr_unlink) {
		fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR,
				true);
		++fotg210->intr_unlink_cycle;
	}
	fotg210->intr_unlinking = false;
}


/* Start another free-iTDs/siTDs cycle */
static void start_free_itds(struct fotg210_hcd *fotg210)
{
	if (!(fotg210->enabled_hrtimer_events &
			BIT(FOTG210_HRTIMER_FREE_ITDS))) {
		fotg210->last_itd_to_free = list_entry(
				fotg210->cached_itd_list.prev,
				struct fotg210_itd, itd_list);
		fotg210_enable_event(fotg210, FOTG210_HRTIMER_FREE_ITDS, true);
	}
}

/* Wait for controller to stop using old iTDs and siTDs */
static void end_free_itds(struct fotg210_hcd *fotg210)
{
	struct fotg210_itd *itd, *n;

	if (fotg210->rh_state < FOTG210_RH_RUNNING)
		fotg210->last_itd_to_free = NULL;

	list_for_each_entry_safe(itd, n, &fotg210->cached_itd_list, itd_list) {
		list_del(&itd->itd_list);
		dma_pool_free(fotg210->itd_pool, itd, itd->itd_dma);
		if (itd == fotg210->last_itd_to_free)
			break;
	}

	if (!list_empty(&fotg210->cached_itd_list))
		start_free_itds(fotg210);
}


/* Handle lost (or very late) IAA interrupts */
static void fotg210_iaa_watchdog(struct fotg210_hcd *fotg210)
{
	if (fotg210->rh_state != FOTG210_RH_RUNNING)
		return;

	/*
	 * Lost IAA irqs wedge things badly; seen first with a vt8235.
	 * So we need this watchdog, but must protect it against both
	 * (a) SMP races against real IAA firing and retriggering, and
	 * (b) clean HC shutdown, when IAA watchdog was pending.
	 */
	if (fotg210->async_iaa) {
		u32 cmd, status;

		/* If we get here, IAA is *REALLY* late.  It's barely
		 * conceivable that the system is so busy that CMD_IAAD
		 * is still legitimately set, so let's be sure it's
		 * clear before we read STS_IAA.  (The HC should clear
		 * CMD_IAAD when it sets STS_IAA.)
		 */
		cmd = fotg210_readl(fotg210, &fotg210->regs->command);

		/*
		 * If IAA is set here it either legitimately triggered
		 * after the watchdog timer expired (_way_ late, so we'll
		 * still count it as lost) ... or a silicon erratum:
		 * - VIA seems to set IAA without triggering the IRQ;
		 * - IAAD potentially cleared without setting IAA.
		 */
		status = fotg210_readl(fotg210, &fotg210->regs->status);
		if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
			INCR(fotg210->stats.lost_iaa);
			fotg210_writel(fotg210, STS_IAA,
					&fotg210->regs->status);
		}

		fotg210_dbg(fotg210, "IAA watchdog: status %x cmd %x\n",
				status, cmd);
		end_unlink_async(fotg210);
	}
}


/* Enable the I/O watchdog, if appropriate */
static void turn_on_io_watchdog(struct fotg210_hcd *fotg210)
{
	/* Not needed if the controller isn't running or it's already enabled */
	if (fotg210->rh_state != FOTG210_RH_RUNNING ||
			(fotg210->enabled_hrtimer_events &
			BIT(FOTG210_HRTIMER_IO_WATCHDOG)))
		return;

	/*
	 * Isochronous transfers always need the watchdog.
	 * For other sorts we use it only if the flag is set.
	 */
	if (fotg210->isoc_count > 0 || (fotg210->need_io_watchdog &&
			fotg210->async_count + fotg210->intr_count > 0))
		fotg210_enable_event(fotg210, FOTG210_HRTIMER_IO_WATCHDOG,
				true);
}


/* Handler functions for the hrtimer event types.
 * Keep this array in the same order as the event types indexed by
 * enum fotg210_hrtimer_event in fotg210.h.
 */
static void (*event_handlers[])(struct fotg210_hcd *) = {
	fotg210_poll_ASS,			/* FOTG210_HRTIMER_POLL_ASS */
	fotg210_poll_PSS,			/* FOTG210_HRTIMER_POLL_PSS */
	fotg210_handle_controller_death,	/* FOTG210_HRTIMER_POLL_DEAD */
	fotg210_handle_intr_unlinks,	/* FOTG210_HRTIMER_UNLINK_INTR */
	end_free_itds,			/* FOTG210_HRTIMER_FREE_ITDS */
	unlink_empty_async,		/* FOTG210_HRTIMER_ASYNC_UNLINKS */
	fotg210_iaa_watchdog,		/* FOTG210_HRTIMER_IAA_WATCHDOG */
	fotg210_disable_PSE,		/* FOTG210_HRTIMER_DISABLE_PERIODIC */
	fotg210_disable_ASE,		/* FOTG210_HRTIMER_DISABLE_ASYNC */
	fotg210_work,			/* FOTG210_HRTIMER_IO_WATCHDOG */
};

static enum hrtimer_restart fotg210_hrtimer_func(struct hrtimer *t)
{
	struct fotg210_hcd *fotg210 =
			container_of(t, struct fotg210_hcd, hrtimer);
	ktime_t now;
	unsigned long events;
	unsigned long flags;
	unsigned e;

	spin_lock_irqsave(&fotg210->lock, flags);

	events = fotg210->enabled_hrtimer_events;
	fotg210->enabled_hrtimer_events = 0;
	fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT;

	/*
	 * Check each pending event.  If its time has expired, handle
	 * the event; otherwise re-enable it.
	 */
	now = ktime_get();
	for_each_set_bit(e, &events, FOTG210_HRTIMER_NUM_EVENTS) {
		if (ktime_compare(now, fotg210->hr_timeouts[e]) >= 0)
			event_handlers[e](fotg210);
		else
			fotg210_enable_event(fotg210, e, false);
	}

	spin_unlock_irqrestore(&fotg210->lock, flags);
	return HRTIMER_NORESTART;
}

#define fotg210_bus_suspend NULL
#define fotg210_bus_resume NULL

static int check_reset_complete(struct fotg210_hcd *fotg210, int index,
		u32 __iomem *status_reg, int port_status)
{
	if (!(port_status & PORT_CONNECT))
		return port_status;

	/* if reset finished and it's still not enabled -- handoff */
	if (!(port_status & PORT_PE))
		/* with integrated TT, there's nobody to hand it to! */
		fotg210_dbg(fotg210, "Failed to enable port %d on root hub TT\n",
				index + 1);
	else
		fotg210_dbg(fotg210, "port %d reset complete, port enabled\n",
				index + 1);

	return port_status;
}


/* build "status change" packet (one or two bytes) from HC registers */

static int fotg210_hub_status_data(struct usb_hcd *hcd, char *buf)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	u32 temp, status;
	u32 mask;
	int retval = 1;
	unsigned long flags;

	/* init status to no-changes */
	buf[0] = 0;

	/* Inform the core about resumes-in-progress by returning
	 * a non-zero value even if there are no status changes.
	 */
	status = fotg210->resuming_ports;

	mask = PORT_CSC | PORT_PEC;
	/* PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND */

	/* no hub change reports (bit 0) for now (power, ...) */

	/* port N changes (bit N)? */
	spin_lock_irqsave(&fotg210->lock, flags);

	temp = fotg210_readl(fotg210, &fotg210->regs->port_status);

	/*
	 * Return status information even for ports with OWNER set.
	 * Otherwise hub_wq wouldn't see the disconnect event when a
	 * high-speed device is switched over to the companion
	 * controller by the user.
	 */

	if ((temp & mask) != 0 || test_bit(0, &fotg210->port_c_suspend) ||
			(fotg210->reset_done[0] &&
			time_after_eq(jiffies, fotg210->reset_done[0]))) {
		buf[0] |= 1 << 1;
		status = STS_PCD;
	}
	/* FIXME autosuspend idle root hubs */
	spin_unlock_irqrestore(&fotg210->lock, flags);
	return status ? retval : 0;
}

static void fotg210_hub_descriptor(struct fotg210_hcd *fotg210,
		struct usb_hub_descriptor *desc)
{
	int ports = HCS_N_PORTS(fotg210->hcs_params);
	u16 temp;

	desc->bDescriptorType = USB_DT_HUB;
	desc->bPwrOn2PwrGood = 10;	/* fotg210 1.0, 2.3.9 says 20ms max */
	desc->bHubContrCurrent = 0;

	desc->bNbrPorts = ports;
	temp = 1 + (ports / 8);
	desc->bDescLength = 7 + 2 * temp;

	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
	memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
	memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);

	temp = HUB_CHAR_INDV_PORT_OCPM;	/* per-port overcurrent reporting */
	temp |= HUB_CHAR_NO_LPSM;	/* no power switching */
	desc->wHubCharacteristics = cpu_to_le16(temp);
}

static int fotg210_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
		u16 wIndex, char *buf, u16 wLength)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	int ports = HCS_N_PORTS(fotg210->hcs_params);
	u32 __iomem *status_reg = &fotg210->regs->port_status;
	u32 temp, temp1, status;
	unsigned long flags;
	int retval = 0;
	unsigned selector;

	/*
	 * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
	 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
	 * (track current state ourselves) ... blink for diagnostics,
	 * power, "this is the one", etc.  EHCI spec supports this.
	 */

	spin_lock_irqsave(&fotg210->lock, flags);
	switch (typeReq) {
	case ClearHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case ClearPortFeature:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		temp = fotg210_readl(fotg210, status_reg);
		temp &= ~PORT_RWC_BITS;

		/*
		 * Even if OWNER is set, so the port is owned by the
		 * companion controller, hub_wq needs to be able to clear
		 * the port-change status bits (especially
		 * USB_PORT_STAT_C_CONNECTION).
		 */

		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
			fotg210_writel(fotg210, temp & ~PORT_PE, status_reg);
			break;
		case USB_PORT_FEAT_C_ENABLE:
			fotg210_writel(fotg210, temp | PORT_PEC, status_reg);
			break;
		case USB_PORT_FEAT_SUSPEND:
			if (temp & PORT_RESET)
				goto error;
			if (!(temp & PORT_SUSPEND))
				break;
			if ((temp & PORT_PE) == 0)
				goto error;

			/* resume signaling for 20 msec */
			fotg210_writel(fotg210, temp | PORT_RESUME, status_reg);
			fotg210->reset_done[wIndex] = jiffies
					+ msecs_to_jiffies(USB_RESUME_TIMEOUT);
			break;
		case USB_PORT_FEAT_C_SUSPEND:
			clear_bit(wIndex, &fotg210->port_c_suspend);
			break;
		case USB_PORT_FEAT_C_CONNECTION:
			fotg210_writel(fotg210, temp | PORT_CSC, status_reg);
			break;
		case USB_PORT_FEAT_C_OVER_CURRENT:
			fotg210_writel(fotg210, temp | OTGISR_OVC,
					&fotg210->regs->otgisr);
			break;
		case USB_PORT_FEAT_C_RESET:
			/* GetPortStatus clears reset */
			break;
		default:
			goto error;
		}
		fotg210_readl(fotg210, &fotg210->regs->command);
		break;
	case GetHubDescriptor:
		fotg210_hub_descriptor(fotg210, (struct usb_hub_descriptor *)
				buf);
		break;
	case GetHubStatus:
		/* no hub-wide feature/status flags */
		memset(buf, 0, 4);
		/*cpu_to_le32s ((u32 *) buf); */
		break;
	case GetPortStatus:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		status = 0;
		temp = fotg210_readl(fotg210, status_reg);

		/* wPortChange bits */
		if (temp & PORT_CSC)
			status |= USB_PORT_STAT_C_CONNECTION << 16;
		if (temp & PORT_PEC)
			status |= USB_PORT_STAT_C_ENABLE << 16;

		temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr);
		if (temp1 & OTGISR_OVC)
			status |= USB_PORT_STAT_C_OVERCURRENT << 16;

		/* whoever resumes must GetPortStatus to complete it!! */
		if (temp & PORT_RESUME) {

			/* Remote Wakeup received? */
			if (!fotg210->reset_done[wIndex]) {
				/* resume signaling for 20 msec */
				fotg210->reset_done[wIndex] = jiffies
						+ msecs_to_jiffies(20);
				/* check the port again */
				mod_timer(&fotg210_to_hcd(fotg210)->rh_timer,
						fotg210->reset_done[wIndex]);
			}

			/* resume completed? */
			else if (time_after_eq(jiffies,
					fotg210->reset_done[wIndex])) {
				clear_bit(wIndex, &fotg210->suspended_ports);
				set_bit(wIndex, &fotg210->port_c_suspend);
				fotg210->reset_done[wIndex] = 0;

				/* stop resume signaling */
				temp = fotg210_readl(fotg210, status_reg);
				fotg210_writel(fotg210, temp &
						~(PORT_RWC_BITS | PORT_RESUME),
						status_reg);
				clear_bit(wIndex, &fotg210->resuming_ports);
				retval = handshake(fotg210, status_reg,
						PORT_RESUME, 0, 2000);/* 2ms */
				if (retval != 0) {
					fotg210_err(fotg210,
							"port %d resume error %d\n",
							wIndex + 1, retval);
					goto error;
				}
				temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
			}
		}

		/* whoever resets must GetPortStatus to complete it!! */
		if ((temp & PORT_RESET) && time_after_eq(jiffies,
				fotg210->reset_done[wIndex])) {
			status |= USB_PORT_STAT_C_RESET << 16;
			fotg210->reset_done[wIndex] = 0;
			clear_bit(wIndex, &fotg210->resuming_ports);

			/* force reset to complete */
			fotg210_writel(fotg210,
					temp & ~(PORT_RWC_BITS | PORT_RESET),
					status_reg);
			/* REVISIT:  some hardware needs 550+ usec to clear
			 * this bit; seems too long to spin routinely...
			 */
			retval = handshake(fotg210, status_reg,
					PORT_RESET, 0, 1000);
			if (retval != 0) {
				fotg210_err(fotg210, "port %d reset error %d\n",
						wIndex + 1, retval);
				goto error;
			}

			/* see what we found out */
			temp = check_reset_complete(fotg210, wIndex, status_reg,
					fotg210_readl(fotg210, status_reg));

			/* restart schedule */
			fotg210->command |= CMD_RUN;
			fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
		}

		if (!(temp & (PORT_RESUME|PORT_RESET))) {
			fotg210->reset_done[wIndex] = 0;
			clear_bit(wIndex, &fotg210->resuming_ports);
		}

		/* transfer dedicated ports to the companion hc */
		if ((temp & PORT_CONNECT) &&
				test_bit(wIndex, &fotg210->companion_ports)) {
			temp &= ~PORT_RWC_BITS;
			fotg210_writel(fotg210, temp, status_reg);
			fotg210_dbg(fotg210, "port %d --> companion\n",
					wIndex + 1);
			temp = fotg210_readl(fotg210, status_reg);
		}

		/*
		 * Even if OWNER is set, there's no harm letting hub_wq
		 * see the wPortStatus values (they should all be 0 except
		 * for PORT_POWER anyway).
		 */

		if (temp & PORT_CONNECT) {
			status |= USB_PORT_STAT_CONNECTION;
			status |= fotg210_port_speed(fotg210, temp);
		}
		if (temp & PORT_PE)
			status |= USB_PORT_STAT_ENABLE;

		/* maybe the port was unsuspended without our knowledge */
		if (temp & (PORT_SUSPEND|PORT_RESUME)) {
			status |= USB_PORT_STAT_SUSPEND;
		} else if (test_bit(wIndex, &fotg210->suspended_ports)) {
			clear_bit(wIndex, &fotg210->suspended_ports);
			clear_bit(wIndex, &fotg210->resuming_ports);
			fotg210->reset_done[wIndex] = 0;
			if (temp & PORT_PE)
				set_bit(wIndex, &fotg210->port_c_suspend);
		}

		temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr);
		if (temp1 & OTGISR_OVC)
			status |= USB_PORT_STAT_OVERCURRENT;
		if (temp & PORT_RESET)
			status |= USB_PORT_STAT_RESET;
		if (test_bit(wIndex, &fotg210->port_c_suspend))
			status |= USB_PORT_STAT_C_SUSPEND << 16;

		if (status & ~0xffff)	/* only if wPortChange is interesting */
			dbg_port(fotg210, "GetStatus", wIndex + 1, temp);
		put_unaligned_le32(status, buf);
		break;
	case SetHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case SetPortFeature:
		selector = wIndex >> 8;
		wIndex &= 0xff;

		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		temp = fotg210_readl(fotg210, status_reg);
		temp &= ~PORT_RWC_BITS;
		switch (wValue) {
		case USB_PORT_FEAT_SUSPEND:
			if ((temp & PORT_PE) == 0
					|| (temp & PORT_RESET) != 0)
				goto error;

			/* After above check the port must be connected.
			 * Set appropriate bit thus could put phy into low power
			 * mode if we have hostpc feature
			 */
			fotg210_writel(fotg210, temp | PORT_SUSPEND,
					status_reg);
			set_bit(wIndex, &fotg210->suspended_ports);
			break;
		case USB_PORT_FEAT_RESET:
			if (temp & PORT_RESUME)
				goto error;
			/* line status bits may report this as low speed,
			 * which can be fine if this root hub has a
			 * transaction translator built in.
			 */
			fotg210_dbg(fotg210, "port %d reset\n", wIndex + 1);
			temp |= PORT_RESET;
			temp &= ~PORT_PE;

			/*
			 * caller must wait, then call GetPortStatus
			 * usb 2.0 spec says 50 ms resets on root
			 */
			fotg210->reset_done[wIndex] = jiffies
					+ msecs_to_jiffies(50);
			fotg210_writel(fotg210, temp, status_reg);
			break;

		/* For downstream facing ports (these):  one hub port is put
		 * into test mode according to USB2 11.24.2.13, then the hub
		 * must be reset (which for root hub now means rmmod+modprobe,
		 * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
		 * about the EHCI-specific stuff.
		 */
		case USB_PORT_FEAT_TEST:
			if (!selector || selector > 5)
				goto error;
			spin_unlock_irqrestore(&fotg210->lock, flags);
			fotg210_quiesce(fotg210);
			spin_lock_irqsave(&fotg210->lock, flags);

			/* Put all enabled ports into suspend */
			temp = fotg210_readl(fotg210, status_reg) &
				~PORT_RWC_BITS;
			if (temp & PORT_PE)
				fotg210_writel(fotg210, temp | PORT_SUSPEND,
						status_reg);

			spin_unlock_irqrestore(&fotg210->lock, flags);
			fotg210_halt(fotg210);
			spin_lock_irqsave(&fotg210->lock, flags);

			temp = fotg210_readl(fotg210, status_reg);
			temp |= selector << 16;
			fotg210_writel(fotg210, temp, status_reg);
			break;

		default:
			goto error;
		}
		fotg210_readl(fotg210, &fotg210->regs->command);
		break;

	default:
error:
		/* "stall" on error */
		retval = -EPIPE;
	}
	spin_unlock_irqrestore(&fotg210->lock, flags);
	return retval;
}

static void __maybe_unused fotg210_relinquish_port(struct usb_hcd *hcd,
		int portnum)
{
	return;
}

static int __maybe_unused fotg210_port_handed_over(struct usb_hcd *hcd,
		int portnum)
{
	return 0;
}

/* There's basically three types of memory:
 *	- data used only by the HCD ... kmalloc is fine
 *	- async and periodic schedules, shared by HC and HCD ... these
 *	  need to use dma_pool or dma_alloc_coherent
 *	- driver buffers, read/written by HC ... single shot DMA mapped
 *
 * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
 * No memory seen by this driver is pageable.
 */

/* Allocate the key transfer structures from the previously allocated pool */
static inline void fotg210_qtd_init(struct fotg210_hcd *fotg210,
		struct fotg210_qtd *qtd, dma_addr_t dma)
{
	memset(qtd, 0, sizeof(*qtd));
	qtd->qtd_dma = dma;
	qtd->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT);
	qtd->hw_next = FOTG210_LIST_END(fotg210);
	qtd->hw_alt_next = FOTG210_LIST_END(fotg210);
	INIT_LIST_HEAD(&qtd->qtd_list);
}

static struct fotg210_qtd *fotg210_qtd_alloc(struct fotg210_hcd *fotg210,
		gfp_t flags)
{
	struct fotg210_qtd *qtd;
	dma_addr_t dma;

	qtd = dma_pool_alloc(fotg210->qtd_pool, flags, &dma);
	if (qtd != NULL)
		fotg210_qtd_init(fotg210, qtd, dma);

	return qtd;
}

static inline void fotg210_qtd_free(struct fotg210_hcd *fotg210,
		struct fotg210_qtd *qtd)
{
	dma_pool_free(fotg210->qtd_pool, qtd, qtd->qtd_dma);
}


static void qh_destroy(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
{
	/* clean qtds first, and know this is not linked */
	if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) {
		fotg210_dbg(fotg210, "unused qh not empty!\n");
		BUG();
	}
	if (qh->dummy)
		fotg210_qtd_free(fotg210, qh->dummy);
	dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma);
	kfree(qh);
}

static struct fotg210_qh *fotg210_qh_alloc(struct fotg210_hcd *fotg210,
		gfp_t flags)
{
	struct fotg210_qh *qh;
	dma_addr_t dma;

	qh = kzalloc(sizeof(*qh), GFP_ATOMIC);
	if (!qh)
		goto done;
	qh->hw = (struct fotg210_qh_hw *)
		dma_pool_zalloc(fotg210->qh_pool, flags, &dma);
	if (!qh->hw)
		goto fail;
	qh->qh_dma = dma;
	INIT_LIST_HEAD(&qh->qtd_list);

	/* dummy td enables safe urb queuing */
	qh->dummy = fotg210_qtd_alloc(fotg210, flags);
	if (qh->dummy == NULL) {
		fotg210_dbg(fotg210, "no dummy td\n");
		goto fail1;
	}
done:
	return qh;
fail1:
	dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma);
fail:
	kfree(qh);
	return NULL;
}

/* The queue heads and transfer descriptors are managed from pools tied
 * to each of the "per device" structures.
 * This is the initialisation and cleanup code.
 */

static void fotg210_mem_cleanup(struct fotg210_hcd *fotg210)
{
	if (fotg210->async)
		qh_destroy(fotg210, fotg210->async);
	fotg210->async = NULL;

	if (fotg210->dummy)
		qh_destroy(fotg210, fotg210->dummy);
	fotg210->dummy = NULL;

	/* DMA consistent memory and pools */
	dma_pool_destroy(fotg210->qtd_pool);
	fotg210->qtd_pool = NULL;

	dma_pool_destroy(fotg210->qh_pool);
	fotg210->qh_pool = NULL;

	dma_pool_destroy(fotg210->itd_pool);
	fotg210->itd_pool = NULL;

	if (fotg210->periodic)
		dma_free_coherent(fotg210_to_hcd(fotg210)->self.controller,
				fotg210->periodic_size * sizeof(u32),
				fotg210->periodic, fotg210->periodic_dma);
	fotg210->periodic = NULL;

	/* shadow periodic table */
	kfree(fotg210->pshadow);
	fotg210->pshadow = NULL;
}

/* remember to add cleanup code (above) if you add anything here */
static int fotg210_mem_init(struct fotg210_hcd *fotg210, gfp_t flags)
{
	int i;

	/* QTDs for control/bulk/intr transfers */
	fotg210->qtd_pool = dma_pool_create("fotg210_qtd",
			fotg210_to_hcd(fotg210)->self.controller,
			sizeof(struct fotg210_qtd),
			32 /* byte alignment (for hw parts) */,
			4096 /* can't cross 4K */);
	if (!fotg210->qtd_pool)
		goto fail;

	/* QHs for control/bulk/intr transfers */
	fotg210->qh_pool = dma_pool_create("fotg210_qh",
			fotg210_to_hcd(fotg210)->self.controller,
			sizeof(struct fotg210_qh_hw),
			32 /* byte alignment (for hw parts) */,
			4096 /* can't cross 4K */);
	if (!fotg210->qh_pool)
		goto fail;

	fotg210->async = fotg210_qh_alloc(fotg210, flags);
	if (!fotg210->async)
		goto fail;

	/* ITD for high speed ISO transfers */
	fotg210->itd_pool = dma_pool_create("fotg210_itd",
			fotg210_to_hcd(fotg210)->self.controller,
			sizeof(struct fotg210_itd),
			64 /* byte alignment (for hw parts) */,
			4096 /* can't cross 4K */);
	if (!fotg210->itd_pool)
		goto fail;

	/* Hardware periodic table */
	fotg210->periodic =
		dma_alloc_coherent(fotg210_to_hcd(fotg210)->self.controller,
				fotg210->periodic_size * sizeof(__le32),
				&fotg210->periodic_dma, 0);
	if (fotg210->periodic == NULL)
		goto fail;

	for (i = 0; i < fotg210->periodic_size; i++)
		fotg210->periodic[i] = FOTG210_LIST_END(fotg210);

	/* software shadow of hardware table */
	fotg210->pshadow = kcalloc(fotg210->periodic_size, sizeof(void *),
			flags);
	if (fotg210->pshadow != NULL)
		return 0;

fail:
	fotg210_dbg(fotg210, "couldn't init memory\n");
	fotg210_mem_cleanup(fotg210);
	return -ENOMEM;
}
/* EHCI hardware queue manipulation ... the core.  QH/QTD manipulation.
 *
 * Control, bulk, and interrupt traffic all use "qh" lists.  They list "qtd"
 * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned
 * buffers needed for the larger number).  We use one QH per endpoint, queue
 * multiple urbs (all three types) per endpoint.  URBs may need several qtds.
 *
 * ISO traffic uses "ISO TD" (itd) records, and (along with
 * interrupts) needs careful scheduling.  Performance improvements can be
 * an ongoing challenge.  That's in "ehci-sched.c".
 *
 * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs,
 * or otherwise through transaction translators (TTs) in USB 2.0 hubs using
 * (b) special fields in qh entries or (c) split iso entries.  TTs will
 * buffer low/full speed data so the host collects it at high speed.
 */

/* fill a qtd, returning how much of the buffer we were able to queue up */
static int qtd_fill(struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd,
		dma_addr_t buf, size_t len, int token, int maxpacket)
{
	int i, count;
	u64 addr = buf;

	/* one buffer entry per 4K ... first might be short or unaligned */
	qtd->hw_buf[0] = cpu_to_hc32(fotg210, (u32)addr);
	qtd->hw_buf_hi[0] = cpu_to_hc32(fotg210, (u32)(addr >> 32));
	count = 0x1000 - (buf & 0x0fff);	/* rest of that page */
	if (likely(len < count))		/* ... iff needed */
		count = len;
	else {
		buf +=  0x1000;
		buf &= ~0x0fff;

		/* per-qtd limit: from 16K to 20K (best alignment) */
		for (i = 1; count < len && i < 5; i++) {
			addr = buf;
			qtd->hw_buf[i] = cpu_to_hc32(fotg210, (u32)addr);
			qtd->hw_buf_hi[i] = cpu_to_hc32(fotg210,
					(u32)(addr >> 32));
			buf += 0x1000;
			if ((count + 0x1000) < len)
				count += 0x1000;
			else
				count = len;
		}

		/* short packets may only terminate transfers */
		if (count != len)
			count -= (count % maxpacket);
	}
	qtd->hw_token = cpu_to_hc32(fotg210, (count << 16) | token);
	qtd->length = count;

	return count;
}

static inline void qh_update(struct fotg210_hcd *fotg210,
		struct fotg210_qh *qh, struct fotg210_qtd *qtd)
{
	struct fotg210_qh_hw *hw = qh->hw;

	/* writes to an active overlay are unsafe */
	BUG_ON(qh->qh_state != QH_STATE_IDLE);

	hw->hw_qtd_next = QTD_NEXT(fotg210, qtd->qtd_dma);
	hw->hw_alt_next = FOTG210_LIST_END(fotg210);

	/* Except for control endpoints, we make hardware maintain data
	 * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
	 * and set the pseudo-toggle in udev. Only usb_clear_halt() will
	 * ever clear it.
	 */
	if (!(hw->hw_info1 & cpu_to_hc32(fotg210, QH_TOGGLE_CTL))) {
		unsigned is_out, epnum;

		is_out = qh->is_out;
		epnum = (hc32_to_cpup(fotg210, &hw->hw_info1) >> 8) & 0x0f;
		if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) {
			hw->hw_token &= ~cpu_to_hc32(fotg210, QTD_TOGGLE);
			usb_settoggle(qh->dev, epnum, is_out, 1);
		}
	}

	hw->hw_token &= cpu_to_hc32(fotg210, QTD_TOGGLE | QTD_STS_PING);
}

/* if it weren't for a common silicon quirk (writing the dummy into the qh
 * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
 * recovery (including urb dequeue) would need software changes to a QH...
 */
static void qh_refresh(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
{
	struct fotg210_qtd *qtd;

	if (list_empty(&qh->qtd_list))
		qtd = qh->dummy;
	else {
		qtd = list_entry(qh->qtd_list.next,
				struct fotg210_qtd, qtd_list);
		/*
		 * first qtd may already be partially processed.
		 * If we come here during unlink, the QH overlay region
		 * might have reference to the just unlinked qtd. The
		 * qtd is updated in qh_completions(). Update the QH
		 * overlay here.
		 */
		if (cpu_to_hc32(fotg210, qtd->qtd_dma) == qh->hw->hw_current) {
			qh->hw->hw_qtd_next = qtd->hw_next;
			qtd = NULL;
		}
	}

	if (qtd)
		qh_update(fotg210, qh, qtd);
}

static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);

static void fotg210_clear_tt_buffer_complete(struct usb_hcd *hcd,
		struct usb_host_endpoint *ep)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	struct fotg210_qh *qh = ep->hcpriv;
	unsigned long flags;

	spin_lock_irqsave(&fotg210->lock, flags);
	qh->clearing_tt = 0;
	if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list)
			&& fotg210->rh_state == FOTG210_RH_RUNNING)
		qh_link_async(fotg210, qh);
	spin_unlock_irqrestore(&fotg210->lock, flags);
}

static void fotg210_clear_tt_buffer(struct fotg210_hcd *fotg210,
		struct fotg210_qh *qh, struct urb *urb, u32 token)
{

	/* If an async split transaction gets an error or is unlinked,
	 * the TT buffer may be left in an indeterminate state.  We
	 * have to clear the TT buffer.
	 *
	 * Note: this routine is never called for Isochronous transfers.
	 */
	if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) {
		struct usb_device *tt = urb->dev->tt->hub;

		dev_dbg(&tt->dev,
				"clear tt buffer port %d, a%d ep%d t%08x\n",
				urb->dev->ttport, urb->dev->devnum,
				usb_pipeendpoint(urb->pipe), token);

		if (urb->dev->tt->hub !=
				fotg210_to_hcd(fotg210)->self.root_hub) {
			if (usb_hub_clear_tt_buffer(urb) == 0)
				qh->clearing_tt = 1;
		}
	}
}

static int qtd_copy_status(struct fotg210_hcd *fotg210, struct urb *urb,
		size_t length, u32 token)
{
	int status = -EINPROGRESS;

	/* count IN/OUT bytes, not SETUP (even short packets) */
	if (likely(QTD_PID(token) != 2))
		urb->actual_length += length - QTD_LENGTH(token);

	/* don't modify error codes */
	if (unlikely(urb->unlinked))
		return status;

	/* force cleanup after short read; not always an error */
	if (unlikely(IS_SHORT_READ(token)))
		status = -EREMOTEIO;

	/* serious "can't proceed" faults reported by the hardware */
	if (token & QTD_STS_HALT) {
		if (token & QTD_STS_BABBLE) {
			/* FIXME "must" disable babbling device's port too */
			status = -EOVERFLOW;
		/* CERR nonzero + halt --> stall */
		} else if (QTD_CERR(token)) {
			status = -EPIPE;

		/* In theory, more than one of the following bits can be set
		 * since they are sticky and the transaction is retried.
		 * Which to test first is rather arbitrary.
		 */
		} else if (token & QTD_STS_MMF) {
			/* fs/ls interrupt xfer missed the complete-split */
			status = -EPROTO;
		} else if (token & QTD_STS_DBE) {
			status = (QTD_PID(token) == 1) /* IN ? */
				? -ENOSR  /* hc couldn't read data */
				: -ECOMM; /* hc couldn't write data */
		} else if (token & QTD_STS_XACT) {
			/* timeout, bad CRC, wrong PID, etc */
			fotg210_dbg(fotg210, "devpath %s ep%d%s 3strikes\n",
					urb->dev->devpath,
					usb_pipeendpoint(urb->pipe),
					usb_pipein(urb->pipe) ? "in" : "out");
			status = -EPROTO;
		} else {	/* unknown */
			status = -EPROTO;
		}

		fotg210_dbg(fotg210,
				"dev%d ep%d%s qtd token %08x --> status %d\n",
				usb_pipedevice(urb->pipe),
				usb_pipeendpoint(urb->pipe),
				usb_pipein(urb->pipe) ? "in" : "out",
				token, status);
	}

	return status;
}

static void fotg210_urb_done(struct fotg210_hcd *fotg210, struct urb *urb,
		int status)
__releases(fotg210->lock)
__acquires(fotg210->lock)
{
	if (likely(urb->hcpriv != NULL)) {
		struct fotg210_qh *qh = (struct fotg210_qh *) urb->hcpriv;

		/* S-mask in a QH means it's an interrupt urb */
		if ((qh->hw->hw_info2 & cpu_to_hc32(fotg210, QH_SMASK)) != 0) {

			/* ... update hc-wide periodic stats (for usbfs) */
			fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs--;
		}
	}

	if (unlikely(urb->unlinked)) {
		INCR(fotg210->stats.unlink);
	} else {
		/* report non-error and short read status as zero */
		if (status == -EINPROGRESS || status == -EREMOTEIO)
			status = 0;
		INCR(fotg210->stats.complete);
	}

#ifdef FOTG210_URB_TRACE
	fotg210_dbg(fotg210,
			"%s %s urb %p ep%d%s status %d len %d/%d\n",
			__func__, urb->dev->devpath, urb,
			usb_pipeendpoint(urb->pipe),
			usb_pipein(urb->pipe) ? "in" : "out",
			status,
			urb->actual_length, urb->transfer_buffer_length);
#endif

	/* complete() can reenter this HCD */
	usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
	spin_unlock(&fotg210->lock);
	usb_hcd_giveback_urb(fotg210_to_hcd(fotg210), urb, status);
	spin_lock(&fotg210->lock);
}

static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);

/* Process and free completed qtds for a qh, returning URBs to drivers.
 * Chases up to qh->hw_current.  Returns number of completions called,
 * indicating how much "real" work we did.
 */
static unsigned qh_completions(struct fotg210_hcd *fotg210,
		struct fotg210_qh *qh)
{
	struct fotg210_qtd *last, *end = qh->dummy;
	struct fotg210_qtd *qtd, *tmp;
	int last_status;
	int stopped;
	unsigned count = 0;
	u8 state;
	struct fotg210_qh_hw *hw = qh->hw;

	if (unlikely(list_empty(&qh->qtd_list)))
		return count;

	/* completions (or tasks on other cpus) must never clobber HALT
	 * till we've gone through and cleaned everything up, even when
	 * they add urbs to this qh's queue or mark them for unlinking.
	 *
	 * NOTE:  unlinking expects to be done in queue order.
	 *
	 * It's a bug for qh->qh_state to be anything other than
	 * QH_STATE_IDLE, unless our caller is scan_async() or
	 * scan_intr().
	 */
	state = qh->qh_state;
	qh->qh_state = QH_STATE_COMPLETING;
	stopped = (state == QH_STATE_IDLE);

rescan:
	last = NULL;
	last_status = -EINPROGRESS;
	qh->needs_rescan = 0;

	/* remove de-activated QTDs from front of queue.
	 * after faults (including short reads), cleanup this urb
	 * then let the queue advance.
	 * if queue is stopped, handles unlinks.
	 */
	list_for_each_entry_safe(qtd, tmp, &qh->qtd_list, qtd_list) {
		struct urb *urb;
		u32 token = 0;

		urb = qtd->urb;

		/* clean up any state from previous QTD ...*/
		if (last) {
			if (likely(last->urb != urb)) {
				fotg210_urb_done(fotg210, last->urb,
						last_status);
				count++;
				last_status = -EINPROGRESS;
			}
			fotg210_qtd_free(fotg210, last);
			last = NULL;
		}

		/* ignore urbs submitted during completions we reported */
		if (qtd == end)
			break;

		/* hardware copies qtd out of qh overlay */
		rmb();
		token = hc32_to_cpu(fotg210, qtd->hw_token);

		/* always clean up qtds the hc de-activated */
retry_xacterr:
		if ((token & QTD_STS_ACTIVE) == 0) {

			/* Report Data Buffer Error: non-fatal but useful */
			if (token & QTD_STS_DBE)
				fotg210_dbg(fotg210,
					"detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n",
					urb, usb_endpoint_num(&urb->ep->desc),
					usb_endpoint_dir_in(&urb->ep->desc)
						? "in" : "out",
					urb->transfer_buffer_length, qtd, qh);

			/* on STALL, error, and short reads this urb must
			 * complete and all its qtds must be recycled.
			 */
			if ((token & QTD_STS_HALT) != 0) {

				/* retry transaction errors until we
				 * reach the software xacterr limit
				 */
				if ((token & QTD_STS_XACT) &&
						QTD_CERR(token) == 0 &&
						++qh->xacterrs < QH_XACTERR_MAX &&
						!urb->unlinked) {
					fotg210_dbg(fotg210,
						"detected XactErr len %zu/%zu retry %d\n",
						qtd->length - QTD_LENGTH(token),
						qtd->length,
						qh->xacterrs);

					/* reset the token in the qtd and the
					 * qh overlay (which still contains
					 * the qtd) so that we pick up from
					 * where we left off
					 */
					token &= ~QTD_STS_HALT;
					token |= QTD_STS_ACTIVE |
						 (FOTG210_TUNE_CERR << 10);
					qtd->hw_token = cpu_to_hc32(fotg210,
							token);
					wmb();
					hw->hw_token = cpu_to_hc32(fotg210,
							token);
					goto retry_xacterr;
				}
				stopped = 1;

			/* magic dummy for some short reads; qh won't advance.
			 * that silicon quirk can kick in with this dummy too.
			 *
			 * other short reads won't stop the queue, including
			 * control transfers (status stage handles that) or
			 * most other single-qtd reads ... the queue stops if
			 * URB_SHORT_NOT_OK was set so the driver submitting
			 * the urbs could clean it up.
			 */
			} else if (IS_SHORT_READ(token) &&
					!(qtd->hw_alt_next &
					FOTG210_LIST_END(fotg210))) {
				stopped = 1;
			}

		/* stop scanning when we reach qtds the hc is using */
		} else if (likely(!stopped
				&& fotg210->rh_state >= FOTG210_RH_RUNNING)) {
			break;

		/* scan the whole queue for unlinks whenever it stops */
		} else {
			stopped = 1;

			/* cancel everything if we halt, suspend, etc */
			if (fotg210->rh_state < FOTG210_RH_RUNNING)
				last_status = -ESHUTDOWN;

			/* this qtd is active; skip it unless a previous qtd
			 * for its urb faulted, or its urb was canceled.
			 */
			else if (last_status == -EINPROGRESS && !urb->unlinked)
				continue;

			/* qh unlinked; token in overlay may be most current */
			if (state == QH_STATE_IDLE &&
					cpu_to_hc32(fotg210, qtd->qtd_dma)
					== hw->hw_current) {
				token = hc32_to_cpu(fotg210, hw->hw_token);

				/* An unlink may leave an incomplete
				 * async transaction in the TT buffer.
				 * We have to clear it.
				 */
				fotg210_clear_tt_buffer(fotg210, qh, urb,
						token);
			}
		}

		/* unless we already know the urb's status, collect qtd status
		 * and update count of bytes transferred.  in common short read
		 * cases with only one data qtd (including control transfers),
		 * queue processing won't halt.  but with two or more qtds (for
		 * example, with a 32 KB transfer), when the first qtd gets a
		 * short read the second must be removed by hand.
		 */
		if (last_status == -EINPROGRESS) {
			last_status = qtd_copy_status(fotg210, urb,
					qtd->length, token);
			if (last_status == -EREMOTEIO &&
					(qtd->hw_alt_next &
					FOTG210_LIST_END(fotg210)))
				last_status = -EINPROGRESS;

			/* As part of low/full-speed endpoint-halt processing
			 * we must clear the TT buffer (11.17.5).
			 */
			if (unlikely(last_status != -EINPROGRESS &&
					last_status != -EREMOTEIO)) {
				/* The TT's in some hubs malfunction when they
				 * receive this request following a STALL (they
				 * stop sending isochronous packets).  Since a
				 * STALL can't leave the TT buffer in a busy
				 * state (if you believe Figures 11-48 - 11-51
				 * in the USB 2.0 spec), we won't clear the TT
				 * buffer in this case.  Strictly speaking this
				 * is a violation of the spec.
				 */
				if (last_status != -EPIPE)
					fotg210_clear_tt_buffer(fotg210, qh,
							urb, token);
			}
		}

		/* if we're removing something not at the queue head,
		 * patch the hardware queue pointer.
		 */
		if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
			last = list_entry(qtd->qtd_list.prev,
					struct fotg210_qtd, qtd_list);
			last->hw_next = qtd->hw_next;
		}

		/* remove qtd; it's recycled after possible urb completion */
		list_del(&qtd->qtd_list);
		last = qtd;

		/* reinit the xacterr counter for the next qtd */
		qh->xacterrs = 0;
	}

	/* last urb's completion might still need calling */
	if (likely(last != NULL)) {
		fotg210_urb_done(fotg210, last->urb, last_status);
		count++;
		fotg210_qtd_free(fotg210, last);
	}

	/* Do we need to rescan for URBs dequeued during a giveback? */
	if (unlikely(qh->needs_rescan)) {
		/* If the QH is already unlinked, do the rescan now. */
		if (state == QH_STATE_IDLE)
			goto rescan;

		/* Otherwise we have to wait until the QH is fully unlinked.
		 * Our caller will start an unlink if qh->needs_rescan is
		 * set.  But if an unlink has already started, nothing needs
		 * to be done.
		 */
		if (state != QH_STATE_LINKED)
			qh->needs_rescan = 0;
	}

	/* restore original state; caller must unlink or relink */
	qh->qh_state = state;

	/* be sure the hardware's done with the qh before refreshing
	 * it after fault cleanup, or recovering from silicon wrongly
	 * overlaying the dummy qtd (which reduces DMA chatter).
	 */
	if (stopped != 0 || hw->hw_qtd_next == FOTG210_LIST_END(fotg210)) {
		switch (state) {
		case QH_STATE_IDLE:
			qh_refresh(fotg210, qh);
			break;
		case QH_STATE_LINKED:
			/* We won't refresh a QH that's linked (after the HC
			 * stopped the queue).  That avoids a race:
			 *  - HC reads first part of QH;
			 *  - CPU updates that first part and the token;
			 *  - HC reads rest of that QH, including token
			 * Result:  HC gets an inconsistent image, and then
			 * DMAs to/from the wrong memory (corrupting it).
			 *
			 * That should be rare for interrupt transfers,
			 * except maybe high bandwidth ...
			 */

			/* Tell the caller to start an unlink */
			qh->needs_rescan = 1;
			break;
		/* otherwise, unlink already started */
		}
	}

	return count;
}

/* reverse of qh_urb_transaction:  free a list of TDs.
 * used for cleanup after errors, before HC sees an URB's TDs.
 */
static void qtd_list_free(struct fotg210_hcd *fotg210, struct urb *urb,
		struct list_head *head)
{
	struct fotg210_qtd *qtd, *temp;

	list_for_each_entry_safe(qtd, temp, head, qtd_list) {
		list_del(&qtd->qtd_list);
		fotg210_qtd_free(fotg210, qtd);
	}
}

/* create a list of filled qtds for this URB; won't link into qh.
 */
static struct list_head *qh_urb_transaction(struct fotg210_hcd *fotg210,
		struct urb *urb, struct list_head *head, gfp_t flags)
{
	struct fotg210_qtd *qtd, *qtd_prev;
	dma_addr_t buf;
	int len, this_sg_len, maxpacket;
	int is_input;
	u32 token;
	int i;
	struct scatterlist *sg;

	/*
	 * URBs map to sequences of QTDs:  one logical transaction
	 */
	qtd = fotg210_qtd_alloc(fotg210, flags);
	if (unlikely(!qtd))
		return NULL;
	list_add_tail(&qtd->qtd_list, head);
	qtd->urb = urb;

	token = QTD_STS_ACTIVE;
	token |= (FOTG210_TUNE_CERR << 10);
	/* for split transactions, SplitXState initialized to zero */

	len = urb->transfer_buffer_length;
	is_input = usb_pipein(urb->pipe);
	if (usb_pipecontrol(urb->pipe)) {
		/* SETUP pid */
		qtd_fill(fotg210, qtd, urb->setup_dma,
				sizeof(struct usb_ctrlrequest),
				token | (2 /* "setup" */ << 8), 8);

		/* ... and always at least one more pid */
		token ^= QTD_TOGGLE;
		qtd_prev = qtd;
		qtd = fotg210_qtd_alloc(fotg210, flags);
		if (unlikely(!qtd))
			goto cleanup;
		qtd->urb = urb;
		qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma);
		list_add_tail(&qtd->qtd_list, head);

		/* for zero length DATA stages, STATUS is always IN */
		if (len == 0)
			token |= (1 /* "in" */ << 8);
	}

	/*
	 * data transfer stage:  buffer setup
	 */
	i = urb->num_mapped_sgs;
	if (len > 0 && i > 0) {
		sg = urb->sg;
		buf = sg_dma_address(sg);

		/* urb->transfer_buffer_length may be smaller than the
		 * size of the scatterlist (or vice versa)
		 */
		this_sg_len = min_t(int, sg_dma_len(sg), len);
	} else {
		sg = NULL;
		buf = urb->transfer_dma;
		this_sg_len = len;
	}

	if (is_input)
		token |= (1 /* "in" */ << 8);
	/* else it's already initted to "out" pid (0 << 8) */

	maxpacket = usb_maxpacket(urb->dev, urb->pipe);

	/*
	 * buffer gets wrapped in one or more qtds;
	 * last one may be "short" (including zero len)
	 * and may serve as a control status ack
	 */
	for (;;) {
		int this_qtd_len;

		this_qtd_len = qtd_fill(fotg210, qtd, buf, this_sg_len, token,
				maxpacket);
		this_sg_len -= this_qtd_len;
		len -= this_qtd_len;
		buf += this_qtd_len;

		/*
		 * short reads advance to a "magic" dummy instead of the next
		 * qtd ... that forces the queue to stop, for manual cleanup.
		 * (this will usually be overridden later.)
		 */
		if (is_input)
			qtd->hw_alt_next = fotg210->async->hw->hw_alt_next;

		/* qh makes control packets use qtd toggle; maybe switch it */
		if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
			token ^= QTD_TOGGLE;

		if (likely(this_sg_len <= 0)) {
			if (--i <= 0 || len <= 0)
				break;
			sg = sg_next(sg);
			buf = sg_dma_address(sg);
			this_sg_len = min_t(int, sg_dma_len(sg), len);
		}

		qtd_prev = qtd;
		qtd = fotg210_qtd_alloc(fotg210, flags);
		if (unlikely(!qtd))
			goto cleanup;
		qtd->urb = urb;
		qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma);
		list_add_tail(&qtd->qtd_list, head);
	}

	/*
	 * unless the caller requires manual cleanup after short reads,
	 * have the alt_next mechanism keep the queue running after the
	 * last data qtd (the only one, for control and most other cases).
	 */
	if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 ||
			usb_pipecontrol(urb->pipe)))
		qtd->hw_alt_next = FOTG210_LIST_END(fotg210);

	/*
	 * control requests may need a terminating data "status" ack;
	 * other OUT ones may need a terminating short packet
	 * (zero length).
	 */
	if (likely(urb->transfer_buffer_length != 0)) {
		int one_more = 0;

		if (usb_pipecontrol(urb->pipe)) {
			one_more = 1;
			token ^= 0x0100;	/* "in" <--> "out"  */
			token |= QTD_TOGGLE;	/* force DATA1 */
		} else if (usb_pipeout(urb->pipe)
				&& (urb->transfer_flags & URB_ZERO_PACKET)
				&& !(urb->transfer_buffer_length % maxpacket)) {
			one_more = 1;
		}
		if (one_more) {
			qtd_prev = qtd;
			qtd = fotg210_qtd_alloc(fotg210, flags);
			if (unlikely(!qtd))
				goto cleanup;
			qtd->urb = urb;
			qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma);
			list_add_tail(&qtd->qtd_list, head);

			/* never any data in such packets */
			qtd_fill(fotg210, qtd, 0, 0, token, 0);
		}
	}

	/* by default, enable interrupt on urb completion */
	if (likely(!(urb->transfer_flags & URB_NO_INTERRUPT)))
		qtd->hw_token |= cpu_to_hc32(fotg210, QTD_IOC);
	return head;

cleanup:
	qtd_list_free(fotg210, urb, head);
	return NULL;
}

/* Would be best to create all qh's from config descriptors,
 * when each interface/altsetting is established.  Unlink
 * any previous qh and cancel its urbs first; endpoints are
 * implicitly reset then (data toggle too).
 * That'd mean updating how usbcore talks to HCDs. (2.7?)
 */


/* Each QH holds a qtd list; a QH is used for everything except iso.
 *
 * For interrupt urbs, the scheduler must set the microframe scheduling
 * mask(s) each time the QH gets scheduled.  For highspeed, that's
 * just one microframe in the s-mask.  For split interrupt transactions
 * there are additional complications: c-mask, maybe FSTNs.
 */
static struct fotg210_qh *qh_make(struct fotg210_hcd *fotg210, struct urb *urb,
		gfp_t flags)
{
	struct fotg210_qh *qh = fotg210_qh_alloc(fotg210, flags);
	struct usb_host_endpoint *ep;
	u32 info1 = 0, info2 = 0;
	int is_input, type;
	int maxp = 0;
	int mult;
	struct usb_tt *tt = urb->dev->tt;
	struct fotg210_qh_hw *hw;

	if (!qh)
		return qh;

	/*
	 * init endpoint/device data for this QH
	 */
	info1 |= usb_pipeendpoint(urb->pipe) << 8;
	info1 |= usb_pipedevice(urb->pipe) << 0;

	is_input = usb_pipein(urb->pipe);
	type = usb_pipetype(urb->pipe);
	ep = usb_pipe_endpoint(urb->dev, urb->pipe);
	maxp = usb_endpoint_maxp(&ep->desc);
	mult = usb_endpoint_maxp_mult(&ep->desc);

	/* 1024 byte maxpacket is a hardware ceiling.  High bandwidth
	 * acts like up to 3KB, but is built from smaller packets.
	 */
	if (maxp > 1024) {
		fotg210_dbg(fotg210, "bogus qh maxpacket %d\n", maxp);
		goto done;
	}

	/* Compute interrupt scheduling parameters just once, and save.
	 * - allowing for high bandwidth, how many nsec/uframe are used?
	 * - split transactions need a second CSPLIT uframe; same question
	 * - splits also need a schedule gap (for full/low speed I/O)
	 * - qh has a polling interval
	 *
	 * For control/bulk requests, the HC or TT handles these.
	 */
	if (type == PIPE_INTERRUPT) {
		qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
				is_input, 0, mult * maxp));
		qh->start = NO_FRAME;

		if (urb->dev->speed == USB_SPEED_HIGH) {
			qh->c_usecs = 0;
			qh->gap_uf = 0;

			qh->period = urb->interval >> 3;
			if (qh->period == 0 && urb->interval != 1) {
				/* NOTE interval 2 or 4 uframes could work.
				 * But interval 1 scheduling is simpler, and
				 * includes high bandwidth.
				 */
				urb->interval = 1;
			} else if (qh->period > fotg210->periodic_size) {
				qh->period = fotg210->periodic_size;
				urb->interval = qh->period << 3;
			}
		} else {
			int think_time;

			/* gap is f(FS/LS transfer times) */
			qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed,
					is_input, 0, maxp) / (125 * 1000);

			/* FIXME this just approximates SPLIT/CSPLIT times */
			if (is_input) {		/* SPLIT, gap, CSPLIT+DATA */
				qh->c_usecs = qh->usecs + HS_USECS(0);
				qh->usecs = HS_USECS(1);
			} else {		/* SPLIT+DATA, gap, CSPLIT */
				qh->usecs += HS_USECS(1);
				qh->c_usecs = HS_USECS(0);
			}

			think_time = tt ? tt->think_time : 0;
			qh->tt_usecs = NS_TO_US(think_time +
					usb_calc_bus_time(urb->dev->speed,
					is_input, 0, maxp));
			qh->period = urb->interval;
			if (qh->period > fotg210->periodic_size) {
				qh->period = fotg210->periodic_size;
				urb->interval = qh->period;
			}
		}
	}

	/* support for tt scheduling, and access to toggles */
	qh->dev = urb->dev;

	/* using TT? */
	switch (urb->dev->speed) {
	case USB_SPEED_LOW:
		info1 |= QH_LOW_SPEED;
		fallthrough;

	case USB_SPEED_FULL:
		/* EPS 0 means "full" */
		if (type != PIPE_INTERRUPT)
			info1 |= (FOTG210_TUNE_RL_TT << 28);
		if (type == PIPE_CONTROL) {
			info1 |= QH_CONTROL_EP;		/* for TT */
			info1 |= QH_TOGGLE_CTL;		/* toggle from qtd */
		}
		info1 |= maxp << 16;

		info2 |= (FOTG210_TUNE_MULT_TT << 30);

		/* Some Freescale processors have an erratum in which the
		 * port number in the queue head was 0..N-1 instead of 1..N.
		 */
		if (fotg210_has_fsl_portno_bug(fotg210))
			info2 |= (urb->dev->ttport-1) << 23;
		else
			info2 |= urb->dev->ttport << 23;

		/* set the address of the TT; for TDI's integrated
		 * root hub tt, leave it zeroed.
		 */
		if (tt && tt->hub != fotg210_to_hcd(fotg210)->self.root_hub)
			info2 |= tt->hub->devnum << 16;

		/* NOTE:  if (PIPE_INTERRUPT) { scheduler sets c-mask } */

		break;

	case USB_SPEED_HIGH:		/* no TT involved */
		info1 |= QH_HIGH_SPEED;
		if (type == PIPE_CONTROL) {
			info1 |= (FOTG210_TUNE_RL_HS << 28);
			info1 |= 64 << 16;	/* usb2 fixed maxpacket */
			info1 |= QH_TOGGLE_CTL;	/* toggle from qtd */
			info2 |= (FOTG210_TUNE_MULT_HS << 30);
		} else if (type == PIPE_BULK) {
			info1 |= (FOTG210_TUNE_RL_HS << 28);
			/* The USB spec says that high speed bulk endpoints
			 * always use 512 byte maxpacket.  But some device
			 * vendors decided to ignore that, and MSFT is happy
			 * to help them do so.  So now people expect to use
			 * such nonconformant devices with Linux too; sigh.
			 */
			info1 |= maxp << 16;
			info2 |= (FOTG210_TUNE_MULT_HS << 30);
		} else {		/* PIPE_INTERRUPT */
			info1 |= maxp << 16;
			info2 |= mult << 30;
		}
		break;
	default:
		fotg210_dbg(fotg210, "bogus dev %p speed %d\n", urb->dev,
				urb->dev->speed);
done:
		qh_destroy(fotg210, qh);
		return NULL;
	}

	/* NOTE:  if (PIPE_INTERRUPT) { scheduler sets s-mask } */

	/* init as live, toggle clear, advance to dummy */
	qh->qh_state = QH_STATE_IDLE;
	hw = qh->hw;
	hw->hw_info1 = cpu_to_hc32(fotg210, info1);
	hw->hw_info2 = cpu_to_hc32(fotg210, info2);
	qh->is_out = !is_input;
	usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1);
	qh_refresh(fotg210, qh);
	return qh;
}

static void enable_async(struct fotg210_hcd *fotg210)
{
	if (fotg210->async_count++)
		return;

	/* Stop waiting to turn off the async schedule */
	fotg210->enabled_hrtimer_events &= ~BIT(FOTG210_HRTIMER_DISABLE_ASYNC);

	/* Don't start the schedule until ASS is 0 */
	fotg210_poll_ASS(fotg210);
	turn_on_io_watchdog(fotg210);
}

static void disable_async(struct fotg210_hcd *fotg210)
{
	if (--fotg210->async_count)
		return;

	/* The async schedule and async_unlink list are supposed to be empty */
	WARN_ON(fotg210->async->qh_next.qh || fotg210->async_unlink);

	/* Don't turn off the schedule until ASS is 1 */
	fotg210_poll_ASS(fotg210);
}

/* move qh (and its qtds) onto async queue; maybe enable queue.  */

static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
{
	__hc32 dma = QH_NEXT(fotg210, qh->qh_dma);
	struct fotg210_qh *head;

	/* Don't link a QH if there's a Clear-TT-Buffer pending */
	if (unlikely(qh->clearing_tt))
		return;

	WARN_ON(qh->qh_state != QH_STATE_IDLE);

	/* clear halt and/or toggle; and maybe recover from silicon quirk */
	qh_refresh(fotg210, qh);

	/* splice right after start */
	head = fotg210->async;
	qh->qh_next = head->qh_next;
	qh->hw->hw_next = head->hw->hw_next;
	wmb();

	head->qh_next.qh = qh;
	head->hw->hw_next = dma;

	qh->xacterrs = 0;
	qh->qh_state = QH_STATE_LINKED;
	/* qtd completions reported later by interrupt */

	enable_async(fotg210);
}

/* For control/bulk/interrupt, return QH with these TDs appended.
 * Allocates and initializes the QH if necessary.
 * Returns null if it can't allocate a QH it needs to.
 * If the QH has TDs (urbs) already, that's great.
 */
static struct fotg210_qh *qh_append_tds(struct fotg210_hcd *fotg210,
		struct urb *urb, struct list_head *qtd_list,
		int epnum, void **ptr)
{
	struct fotg210_qh *qh = NULL;
	__hc32 qh_addr_mask = cpu_to_hc32(fotg210, 0x7f);

	qh = (struct fotg210_qh *) *ptr;
	if (unlikely(qh == NULL)) {
		/* can't sleep here, we have fotg210->lock... */
		qh = qh_make(fotg210, urb, GFP_ATOMIC);
		*ptr = qh;
	}
	if (likely(qh != NULL)) {
		struct fotg210_qtd *qtd;

		if (unlikely(list_empty(qtd_list)))
			qtd = NULL;
		else
			qtd = list_entry(qtd_list->next, struct fotg210_qtd,
					qtd_list);

		/* control qh may need patching ... */
		if (unlikely(epnum == 0)) {
			/* usb_reset_device() briefly reverts to address 0 */
			if (usb_pipedevice(urb->pipe) == 0)
				qh->hw->hw_info1 &= ~qh_addr_mask;
		}

		/* just one way to queue requests: swap with the dummy qtd.
		 * only hc or qh_refresh() ever modify the overlay.
		 */
		if (likely(qtd != NULL)) {
			struct fotg210_qtd *dummy;
			dma_addr_t dma;
			__hc32 token;

			/* to avoid racing the HC, use the dummy td instead of
			 * the first td of our list (becomes new dummy).  both
			 * tds stay deactivated until we're done, when the
			 * HC is allowed to fetch the old dummy (4.10.2).
			 */
			token = qtd->hw_token;
			qtd->hw_token = HALT_BIT(fotg210);

			dummy = qh->dummy;

			dma = dummy->qtd_dma;
			*dummy = *qtd;
			dummy->qtd_dma = dma;

			list_del(&qtd->qtd_list);
			list_add(&dummy->qtd_list, qtd_list);
			list_splice_tail(qtd_list, &qh->qtd_list);

			fotg210_qtd_init(fotg210, qtd, qtd->qtd_dma);
			qh->dummy = qtd;

			/* hc must see the new dummy at list end */
			dma = qtd->qtd_dma;
			qtd = list_entry(qh->qtd_list.prev,
					struct fotg210_qtd, qtd_list);
			qtd->hw_next = QTD_NEXT(fotg210, dma);

			/* let the hc process these next qtds */
			wmb();
			dummy->hw_token = token;

			urb->hcpriv = qh;
		}
	}
	return qh;
}

static int submit_async(struct fotg210_hcd *fotg210, struct urb *urb,
		struct list_head *qtd_list, gfp_t mem_flags)
{
	int epnum;
	unsigned long flags;
	struct fotg210_qh *qh = NULL;
	int rc;

	epnum = urb->ep->desc.bEndpointAddress;

#ifdef FOTG210_URB_TRACE
	{
		struct fotg210_qtd *qtd;

		qtd = list_entry(qtd_list->next, struct fotg210_qtd, qtd_list);
		fotg210_dbg(fotg210,
				"%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
				__func__, urb->dev->devpath, urb,
				epnum & 0x0f, (epnum & USB_DIR_IN)
					? "in" : "out",
				urb->transfer_buffer_length,
				qtd, urb->ep->hcpriv);
	}
#endif

	spin_lock_irqsave(&fotg210->lock, flags);
	if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) {
		rc = -ESHUTDOWN;
		goto done;
	}
	rc = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb);
	if (unlikely(rc))
		goto done;

	qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv);
	if (unlikely(qh == NULL)) {
		usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
		rc = -ENOMEM;
		goto done;
	}

	/* Control/bulk operations through TTs don't need scheduling,
	 * the HC and TT handle it when the TT has a buffer ready.
	 */
	if (likely(qh->qh_state == QH_STATE_IDLE))
		qh_link_async(fotg210, qh);
done:
	spin_unlock_irqrestore(&fotg210->lock, flags);
	if (unlikely(qh == NULL))
		qtd_list_free(fotg210, urb, qtd_list);
	return rc;
}

static void single_unlink_async(struct fotg210_hcd *fotg210,
		struct fotg210_qh *qh)
{
	struct fotg210_qh *prev;

	/* Add to the end of the list of QHs waiting for the next IAAD */
	qh->qh_state = QH_STATE_UNLINK;
	if (fotg210->async_unlink)
		fotg210->async_unlink_last->unlink_next = qh;
	else
		fotg210->async_unlink = qh;
	fotg210->async_unlink_last = qh;

	/* Unlink it from the schedule */
	prev = fotg210->async;
	while (prev->qh_next.qh != qh)
		prev = prev->qh_next.qh;

	prev->hw->hw_next = qh->hw->hw_next;
	prev->qh_next = qh->qh_next;
	if (fotg210->qh_scan_next == qh)
		fotg210->qh_scan_next = qh->qh_next.qh;
}

static void start_iaa_cycle(struct fotg210_hcd *fotg210, bool nested)
{
	/*
	 * Do nothing if an IAA cycle is already running or
	 * if one will be started shortly.
	 */
	if (fotg210->async_iaa || fotg210->async_unlinking)
		return;

	/* Do all the waiting QHs at once */
	fotg210->async_iaa = fotg210->async_unlink;
	fotg210->async_unlink = NULL;

	/* If the controller isn't running, we don't have to wait for it */
	if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING)) {
		if (!nested)		/* Avoid recursion */
			end_unlink_async(fotg210);

	/* Otherwise start a new IAA cycle */
	} else if (likely(fotg210->rh_state == FOTG210_RH_RUNNING)) {
		/* Make sure the unlinks are all visible to the hardware */
		wmb();

		fotg210_writel(fotg210, fotg210->command | CMD_IAAD,
				&fotg210->regs->command);
		fotg210_readl(fotg210, &fotg210->regs->command);
		fotg210_enable_event(fotg210, FOTG210_HRTIMER_IAA_WATCHDOG,
				true);
	}
}

/* the async qh for the qtds being unlinked are now gone from the HC */

static void end_unlink_async(struct fotg210_hcd *fotg210)
{
	struct fotg210_qh *qh;

	/* Process the idle QHs */
restart:
	fotg210->async_unlinking = true;
	while (fotg210->async_iaa) {
		qh = fotg210->async_iaa;
		fotg210->async_iaa = qh->unlink_next;
		qh->unlink_next = NULL;

		qh->qh_state = QH_STATE_IDLE;
		qh->qh_next.qh = NULL;

		qh_completions(fotg210, qh);
		if (!list_empty(&qh->qtd_list) &&
				fotg210->rh_state == FOTG210_RH_RUNNING)
			qh_link_async(fotg210, qh);
		disable_async(fotg210);
	}
	fotg210->async_unlinking = false;

	/* Start a new IAA cycle if any QHs are waiting for it */
	if (fotg210->async_unlink) {
		start_iaa_cycle(fotg210, true);
		if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING))
			goto restart;
	}
}

static void unlink_empty_async(struct fotg210_hcd *fotg210)
{
	struct fotg210_qh *qh, *next;
	bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING);
	bool check_unlinks_later = false;

	/* Unlink all the async QHs that have been empty for a timer cycle */
	next = fotg210->async->qh_next.qh;
	while (next) {
		qh = next;
		next = qh->qh_next.qh;

		if (list_empty(&qh->qtd_list) &&
				qh->qh_state == QH_STATE_LINKED) {
			if (!stopped && qh->unlink_cycle ==
					fotg210->async_unlink_cycle)
				check_unlinks_later = true;
			else
				single_unlink_async(fotg210, qh);
		}
	}

	/* Start a new IAA cycle if any QHs are waiting for it */
	if (fotg210->async_unlink)
		start_iaa_cycle(fotg210, false);

	/* QHs that haven't been empty for long enough will be handled later */
	if (check_unlinks_later) {
		fotg210_enable_event(fotg210, FOTG210_HRTIMER_ASYNC_UNLINKS,
				true);
		++fotg210->async_unlink_cycle;
	}
}

/* makes sure the async qh will become idle */
/* caller must own fotg210->lock */

static void start_unlink_async(struct fotg210_hcd *fotg210,
		struct fotg210_qh *qh)
{
	/*
	 * If the QH isn't linked then there's nothing we can do
	 * unless we were called during a giveback, in which case
	 * qh_completions() has to deal with it.
	 */
	if (qh->qh_state != QH_STATE_LINKED) {
		if (qh->qh_state == QH_STATE_COMPLETING)
			qh->needs_rescan = 1;
		return;
	}

	single_unlink_async(fotg210, qh);
	start_iaa_cycle(fotg210, false);
}

static void scan_async(struct fotg210_hcd *fotg210)
{
	struct fotg210_qh *qh;
	bool check_unlinks_later = false;

	fotg210->qh_scan_next = fotg210->async->qh_next.qh;
	while (fotg210->qh_scan_next) {
		qh = fotg210->qh_scan_next;
		fotg210->qh_scan_next = qh->qh_next.qh;
rescan:
		/* clean any finished work for this qh */
		if (!list_empty(&qh->qtd_list)) {
			int temp;

			/*
			 * Unlinks could happen here; completion reporting
			 * drops the lock.  That's why fotg210->qh_scan_next
			 * always holds the next qh to scan; if the next qh
			 * gets unlinked then fotg210->qh_scan_next is adjusted
			 * in single_unlink_async().
			 */
			temp = qh_completions(fotg210, qh);
			if (qh->needs_rescan) {
				start_unlink_async(fotg210, qh);
			} else if (list_empty(&qh->qtd_list)
					&& qh->qh_state == QH_STATE_LINKED) {
				qh->unlink_cycle = fotg210->async_unlink_cycle;
				check_unlinks_later = true;
			} else if (temp != 0)
				goto rescan;
		}
	}

	/*
	 * Unlink empty entries, reducing DMA usage as well
	 * as HCD schedule-scanning costs.  Delay for any qh
	 * we just scanned, there's a not-unusual case that it
	 * doesn't stay idle for long.
	 */
	if (check_unlinks_later && fotg210->rh_state == FOTG210_RH_RUNNING &&
			!(fotg210->enabled_hrtimer_events &
			BIT(FOTG210_HRTIMER_ASYNC_UNLINKS))) {
		fotg210_enable_event(fotg210,
				FOTG210_HRTIMER_ASYNC_UNLINKS, true);
		++fotg210->async_unlink_cycle;
	}
}
/* EHCI scheduled transaction support:  interrupt, iso, split iso
 * These are called "periodic" transactions in the EHCI spec.
 *
 * Note that for interrupt transfers, the QH/QTD manipulation is shared
 * with the "asynchronous" transaction support (control/bulk transfers).
 * The only real difference is in how interrupt transfers are scheduled.
 *
 * For ISO, we make an "iso_stream" head to serve the same role as a QH.
 * It keeps track of every ITD (or SITD) that's linked, and holds enough
 * pre-calculated schedule data to make appending to the queue be quick.
 */
static int fotg210_get_frame(struct usb_hcd *hcd);

/* periodic_next_shadow - return "next" pointer on shadow list
 * @periodic: host pointer to qh/itd
 * @tag: hardware tag for type of this record
 */
static union fotg210_shadow *periodic_next_shadow(struct fotg210_hcd *fotg210,
		union fotg210_shadow *periodic, __hc32 tag)
{
	switch (hc32_to_cpu(fotg210, tag)) {
	case Q_TYPE_QH:
		return &periodic->qh->qh_next;
	case Q_TYPE_FSTN:
		return &periodic->fstn->fstn_next;
	default:
		return &periodic->itd->itd_next;
	}
}

static __hc32 *shadow_next_periodic(struct fotg210_hcd *fotg210,
		union fotg210_shadow *periodic, __hc32 tag)
{
	switch (hc32_to_cpu(fotg210, tag)) {
	/* our fotg210_shadow.qh is actually software part */
	case Q_TYPE_QH:
		return &periodic->qh->hw->hw_next;
	/* others are hw parts */
	default:
		return periodic->hw_next;
	}
}

/* caller must hold fotg210->lock */
static void periodic_unlink(struct fotg210_hcd *fotg210, unsigned frame,
		void *ptr)
{
	union fotg210_shadow *prev_p = &fotg210->pshadow[frame];
	__hc32 *hw_p = &fotg210->periodic[frame];
	union fotg210_shadow here = *prev_p;

	/* find predecessor of "ptr"; hw and shadow lists are in sync */
	while (here.ptr && here.ptr != ptr) {
		prev_p = periodic_next_shadow(fotg210, prev_p,
				Q_NEXT_TYPE(fotg210, *hw_p));
		hw_p = shadow_next_periodic(fotg210, &here,
				Q_NEXT_TYPE(fotg210, *hw_p));
		here = *prev_p;
	}
	/* an interrupt entry (at list end) could have been shared */
	if (!here.ptr)
		return;

	/* update shadow and hardware lists ... the old "next" pointers
	 * from ptr may still be in use, the caller updates them.
	 */
	*prev_p = *periodic_next_shadow(fotg210, &here,
			Q_NEXT_TYPE(fotg210, *hw_p));

	*hw_p = *shadow_next_periodic(fotg210, &here,
			Q_NEXT_TYPE(fotg210, *hw_p));
}

/* how many of the uframe's 125 usecs are allocated? */
static unsigned short periodic_usecs(struct fotg210_hcd *fotg210,
		unsigned frame, unsigned uframe)
{
	__hc32 *hw_p = &fotg210->periodic[frame];
	union fotg210_shadow *q = &fotg210->pshadow[frame];
	unsigned usecs = 0;
	struct fotg210_qh_hw *hw;

	while (q->ptr) {
		switch (hc32_to_cpu(fotg210, Q_NEXT_TYPE(fotg210, *hw_p))) {
		case Q_TYPE_QH:
			hw = q->qh->hw;
			/* is it in the S-mask? */
			if (hw->hw_info2 & cpu_to_hc32(fotg210, 1 << uframe))
				usecs += q->qh->usecs;
			/* ... or C-mask? */
			if (hw->hw_info2 & cpu_to_hc32(fotg210,
					1 << (8 + uframe)))
				usecs += q->qh->c_usecs;
			hw_p = &hw->hw_next;
			q = &q->qh->qh_next;
			break;
		/* case Q_TYPE_FSTN: */
		default:
			/* for "save place" FSTNs, count the relevant INTR
			 * bandwidth from the previous frame
			 */
			if (q->fstn->hw_prev != FOTG210_LIST_END(fotg210))
				fotg210_dbg(fotg210, "ignoring FSTN cost ...\n");

			hw_p = &q->fstn->hw_next;
			q = &q->fstn->fstn_next;
			break;
		case Q_TYPE_ITD:
			if (q->itd->hw_transaction[uframe])
				usecs += q->itd->stream->usecs;
			hw_p = &q->itd->hw_next;
			q = &q->itd->itd_next;
			break;
		}
	}
	if (usecs > fotg210->uframe_periodic_max)
		fotg210_err(fotg210, "uframe %d sched overrun: %d usecs\n",
				frame * 8 + uframe, usecs);
	return usecs;
}

static int same_tt(struct usb_device *dev1, struct usb_device *dev2)
{
	if (!dev1->tt || !dev2->tt)
		return 0;
	if (dev1->tt != dev2->tt)
		return 0;
	if (dev1->tt->multi)
		return dev1->ttport == dev2->ttport;
	else
		return 1;
}

/* return true iff the device's transaction translator is available
 * for a periodic transfer starting at the specified frame, using
 * all the uframes in the mask.
 */
static int tt_no_collision(struct fotg210_hcd *fotg210, unsigned period,
		struct usb_device *dev, unsigned frame, u32 uf_mask)
{
	if (period == 0)	/* error */
		return 0;

	/* note bandwidth wastage:  split never follows csplit
	 * (different dev or endpoint) until the next uframe.
	 * calling convention doesn't make that distinction.
	 */
	for (; frame < fotg210->periodic_size; frame += period) {
		union fotg210_shadow here;
		__hc32 type;
		struct fotg210_qh_hw *hw;

		here = fotg210->pshadow[frame];
		type = Q_NEXT_TYPE(fotg210, fotg210->periodic[frame]);
		while (here.ptr) {
			switch (hc32_to_cpu(fotg210, type)) {
			case Q_TYPE_ITD:
				type = Q_NEXT_TYPE(fotg210, here.itd->hw_next);
				here = here.itd->itd_next;
				continue;
			case Q_TYPE_QH:
				hw = here.qh->hw;
				if (same_tt(dev, here.qh->dev)) {
					u32 mask;

					mask = hc32_to_cpu(fotg210,
							hw->hw_info2);
					/* "knows" no gap is needed */
					mask |= mask >> 8;
					if (mask & uf_mask)
						break;
				}
				type = Q_NEXT_TYPE(fotg210, hw->hw_next);
				here = here.qh->qh_next;
				continue;
			/* case Q_TYPE_FSTN: */
			default:
				fotg210_dbg(fotg210,
						"periodic frame %d bogus type %d\n",
						frame, type);
			}

			/* collision or error */
			return 0;
		}
	}

	/* no collision */
	return 1;
}

static void enable_periodic(struct fotg210_hcd *fotg210)
{
	if (fotg210->periodic_count++)
		return;

	/* Stop waiting to turn off the periodic schedule */
	fotg210->enabled_hrtimer_events &=
		~BIT(FOTG210_HRTIMER_DISABLE_PERIODIC);

	/* Don't start the schedule until PSS is 0 */
	fotg210_poll_PSS(fotg210);
	turn_on_io_watchdog(fotg210);
}

static void disable_periodic(struct fotg210_hcd *fotg210)
{
	if (--fotg210->periodic_count)
		return;

	/* Don't turn off the schedule until PSS is 1 */
	fotg210_poll_PSS(fotg210);
}

/* periodic schedule slots have iso tds (normal or split) first, then a
 * sparse tree for active interrupt transfers.
 *
 * this just links in a qh; caller guarantees uframe masks are set right.
 * no FSTN support (yet; fotg210 0.96+)
 */
static void qh_link_periodic(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
{
	unsigned i;
	unsigned period = qh->period;

	dev_dbg(&qh->dev->dev,
			"link qh%d-%04x/%p start %d [%d/%d us]\n", period,
			hc32_to_cpup(fotg210, &qh->hw->hw_info2) &
			(QH_CMASK | QH_SMASK), qh, qh->start, qh->usecs,
			qh->c_usecs);

	/* high bandwidth, or otherwise every microframe */
	if (period == 0)
		period = 1;

	for (i = qh->start; i < fotg210->periodic_size; i += period) {
		union fotg210_shadow *prev = &fotg210->pshadow[i];
		__hc32 *hw_p = &fotg210->periodic[i];
		union fotg210_shadow here = *prev;
		__hc32 type = 0;

		/* skip the iso nodes at list head */
		while (here.ptr) {
			type = Q_NEXT_TYPE(fotg210, *hw_p);
			if (type == cpu_to_hc32(fotg210, Q_TYPE_QH))
				break;
			prev = periodic_next_shadow(fotg210, prev, type);
			hw_p = shadow_next_periodic(fotg210, &here, type);
			here = *prev;
		}

		/* sorting each branch by period (slow-->fast)
		 * enables sharing interior tree nodes
		 */
		while (here.ptr && qh != here.qh) {
			if (qh->period > here.qh->period)
				break;
			prev = &here.qh->qh_next;
			hw_p = &here.qh->hw->hw_next;
			here = *prev;
		}
		/* link in this qh, unless some earlier pass did that */
		if (qh != here.qh) {
			qh->qh_next = here;
			if (here.qh)
				qh->hw->hw_next = *hw_p;
			wmb();
			prev->qh = qh;
			*hw_p = QH_NEXT(fotg210, qh->qh_dma);
		}
	}
	qh->qh_state = QH_STATE_LINKED;
	qh->xacterrs = 0;

	/* update per-qh bandwidth for usbfs */
	fotg210_to_hcd(fotg210)->self.bandwidth_allocated += qh->period
		? ((qh->usecs + qh->c_usecs) / qh->period)
		: (qh->usecs * 8);

	list_add(&qh->intr_node, &fotg210->intr_qh_list);

	/* maybe enable periodic schedule processing */
	++fotg210->intr_count;
	enable_periodic(fotg210);
}

static void qh_unlink_periodic(struct fotg210_hcd *fotg210,
		struct fotg210_qh *qh)
{
	unsigned i;
	unsigned period;

	/*
	 * If qh is for a low/full-speed device, simply unlinking it
	 * could interfere with an ongoing split transaction.  To unlink
	 * it safely would require setting the QH_INACTIVATE bit and
	 * waiting at least one frame, as described in EHCI 4.12.2.5.
	 *
	 * We won't bother with any of this.  Instead, we assume that the
	 * only reason for unlinking an interrupt QH while the current URB
	 * is still active is to dequeue all the URBs (flush the whole
	 * endpoint queue).
	 *
	 * If rebalancing the periodic schedule is ever implemented, this
	 * approach will no longer be valid.
	 */

	/* high bandwidth, or otherwise part of every microframe */
	period = qh->period;
	if (!period)
		period = 1;

	for (i = qh->start; i < fotg210->periodic_size; i += period)
		periodic_unlink(fotg210, i, qh);

	/* update per-qh bandwidth for usbfs */
	fotg210_to_hcd(fotg210)->self.bandwidth_allocated -= qh->period
		? ((qh->usecs + qh->c_usecs) / qh->period)
		: (qh->usecs * 8);

	dev_dbg(&qh->dev->dev,
			"unlink qh%d-%04x/%p start %d [%d/%d us]\n",
			qh->period, hc32_to_cpup(fotg210, &qh->hw->hw_info2) &
			(QH_CMASK | QH_SMASK), qh, qh->start, qh->usecs,
			qh->c_usecs);

	/* qh->qh_next still "live" to HC */
	qh->qh_state = QH_STATE_UNLINK;
	qh->qh_next.ptr = NULL;

	if (fotg210->qh_scan_next == qh)
		fotg210->qh_scan_next = list_entry(qh->intr_node.next,
				struct fotg210_qh, intr_node);
	list_del(&qh->intr_node);
}

static void start_unlink_intr(struct fotg210_hcd *fotg210,
		struct fotg210_qh *qh)
{
	/* If the QH isn't linked then there's nothing we can do
	 * unless we were called during a giveback, in which case
	 * qh_completions() has to deal with it.
	 */
	if (qh->qh_state != QH_STATE_LINKED) {
		if (qh->qh_state == QH_STATE_COMPLETING)
			qh->needs_rescan = 1;
		return;
	}

	qh_unlink_periodic(fotg210, qh);

	/* Make sure the unlinks are visible before starting the timer */
	wmb();

	/*
	 * The EHCI spec doesn't say how long it takes the controller to
	 * stop accessing an unlinked interrupt QH.  The timer delay is
	 * 9 uframes; presumably that will be long enough.
	 */
	qh->unlink_cycle = fotg210->intr_unlink_cycle;

	/* New entries go at the end of the intr_unlink list */
	if (fotg210->intr_unlink)
		fotg210->intr_unlink_last->unlink_next = qh;
	else
		fotg210->intr_unlink = qh;
	fotg210->intr_unlink_last = qh;

	if (fotg210->intr_unlinking)
		;	/* Avoid recursive calls */
	else if (fotg210->rh_state < FOTG210_RH_RUNNING)
		fotg210_handle_intr_unlinks(fotg210);
	else if (fotg210->intr_unlink == qh) {
		fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR,
				true);
		++fotg210->intr_unlink_cycle;
	}
}

static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
{
	struct fotg210_qh_hw *hw = qh->hw;
	int rc;

	qh->qh_state = QH_STATE_IDLE;
	hw->hw_next = FOTG210_LIST_END(fotg210);

	qh_completions(fotg210, qh);

	/* reschedule QH iff another request is queued */
	if (!list_empty(&qh->qtd_list) &&
			fotg210->rh_state == FOTG210_RH_RUNNING) {
		rc = qh_schedule(fotg210, qh);

		/* An error here likely indicates handshake failure
		 * or no space left in the schedule.  Neither fault
		 * should happen often ...
		 *
		 * FIXME kill the now-dysfunctional queued urbs
		 */
		if (rc != 0)
			fotg210_err(fotg210, "can't reschedule qh %p, err %d\n",
					qh, rc);
	}

	/* maybe turn off periodic schedule */
	--fotg210->intr_count;
	disable_periodic(fotg210);
}

static int check_period(struct fotg210_hcd *fotg210, unsigned frame,
		unsigned uframe, unsigned period, unsigned usecs)
{
	int claimed;

	/* complete split running into next frame?
	 * given FSTN support, we could sometimes check...
	 */
	if (uframe >= 8)
		return 0;

	/* convert "usecs we need" to "max already claimed" */
	usecs = fotg210->uframe_periodic_max - usecs;

	/* we "know" 2 and 4 uframe intervals were rejected; so
	 * for period 0, check _every_ microframe in the schedule.
	 */
	if (unlikely(period == 0)) {
		do {
			for (uframe = 0; uframe < 7; uframe++) {
				claimed = periodic_usecs(fotg210, frame,
						uframe);
				if (claimed > usecs)
					return 0;
			}
		} while ((frame += 1) < fotg210->periodic_size);

	/* just check the specified uframe, at that period */
	} else {
		do {
			claimed = periodic_usecs(fotg210, frame, uframe);
			if (claimed > usecs)
				return 0;
		} while ((frame += period) < fotg210->periodic_size);
	}

	/* success! */
	return 1;
}

static int check_intr_schedule(struct fotg210_hcd *fotg210, unsigned frame,
		unsigned uframe, const struct fotg210_qh *qh, __hc32 *c_maskp)
{
	int retval = -ENOSPC;
	u8 mask = 0;

	if (qh->c_usecs && uframe >= 6)		/* FSTN territory? */
		goto done;

	if (!check_period(fotg210, frame, uframe, qh->period, qh->usecs))
		goto done;
	if (!qh->c_usecs) {
		retval = 0;
		*c_maskp = 0;
		goto done;
	}

	/* Make sure this tt's buffer is also available for CSPLITs.
	 * We pessimize a bit; probably the typical full speed case
	 * doesn't need the second CSPLIT.
	 *
	 * NOTE:  both SPLIT and CSPLIT could be checked in just
	 * one smart pass...
	 */
	mask = 0x03 << (uframe + qh->gap_uf);
	*c_maskp = cpu_to_hc32(fotg210, mask << 8);

	mask |= 1 << uframe;
	if (tt_no_collision(fotg210, qh->period, qh->dev, frame, mask)) {
		if (!check_period(fotg210, frame, uframe + qh->gap_uf + 1,
				qh->period, qh->c_usecs))
			goto done;
		if (!check_period(fotg210, frame, uframe + qh->gap_uf,
				qh->period, qh->c_usecs))
			goto done;
		retval = 0;
	}
done:
	return retval;
}

/* "first fit" scheduling policy used the first time through,
 * or when the previous schedule slot can't be re-used.
 */
static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
{
	int status;
	unsigned uframe;
	__hc32 c_mask;
	unsigned frame;	/* 0..(qh->period - 1), or NO_FRAME */
	struct fotg210_qh_hw *hw = qh->hw;

	qh_refresh(fotg210, qh);
	hw->hw_next = FOTG210_LIST_END(fotg210);
	frame = qh->start;

	/* reuse the previous schedule slots, if we can */
	if (frame < qh->period) {
		uframe = ffs(hc32_to_cpup(fotg210, &hw->hw_info2) & QH_SMASK);
		status = check_intr_schedule(fotg210, frame, --uframe,
				qh, &c_mask);
	} else {
		uframe = 0;
		c_mask = 0;
		status = -ENOSPC;
	}

	/* else scan the schedule to find a group of slots such that all
	 * uframes have enough periodic bandwidth available.
	 */
	if (status) {
		/* "normal" case, uframing flexible except with splits */
		if (qh->period) {
			int i;

			for (i = qh->period; status && i > 0; --i) {
				frame = ++fotg210->random_frame % qh->period;
				for (uframe = 0; uframe < 8; uframe++) {
					status = check_intr_schedule(fotg210,
							frame, uframe, qh,
							&c_mask);
					if (status == 0)
						break;
				}
			}

		/* qh->period == 0 means every uframe */
		} else {
			frame = 0;
			status = check_intr_schedule(fotg210, 0, 0, qh,
					&c_mask);
		}
		if (status)
			goto done;
		qh->start = frame;

		/* reset S-frame and (maybe) C-frame masks */
		hw->hw_info2 &= cpu_to_hc32(fotg210, ~(QH_CMASK | QH_SMASK));
		hw->hw_info2 |= qh->period
			? cpu_to_hc32(fotg210, 1 << uframe)
			: cpu_to_hc32(fotg210, QH_SMASK);
		hw->hw_info2 |= c_mask;
	} else
		fotg210_dbg(fotg210, "reused qh %p schedule\n", qh);

	/* stuff into the periodic schedule */
	qh_link_periodic(fotg210, qh);
done:
	return status;
}

static int intr_submit(struct fotg210_hcd *fotg210, struct urb *urb,
		struct list_head *qtd_list, gfp_t mem_flags)
{
	unsigned epnum;
	unsigned long flags;
	struct fotg210_qh *qh;
	int status;
	struct list_head empty;

	/* get endpoint and transfer/schedule data */
	epnum = urb->ep->desc.bEndpointAddress;

	spin_lock_irqsave(&fotg210->lock, flags);

	if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) {
		status = -ESHUTDOWN;
		goto done_not_linked;
	}
	status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb);
	if (unlikely(status))
		goto done_not_linked;

	/* get qh and force any scheduling errors */
	INIT_LIST_HEAD(&empty);
	qh = qh_append_tds(fotg210, urb, &empty, epnum, &urb->ep->hcpriv);
	if (qh == NULL) {
		status = -ENOMEM;
		goto done;
	}
	if (qh->qh_state == QH_STATE_IDLE) {
		status = qh_schedule(fotg210, qh);
		if (status)
			goto done;
	}

	/* then queue the urb's tds to the qh */
	qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv);
	BUG_ON(qh == NULL);

	/* ... update usbfs periodic stats */
	fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs++;

done:
	if (unlikely(status))
		usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
done_not_linked:
	spin_unlock_irqrestore(&fotg210->lock, flags);
	if (status)
		qtd_list_free(fotg210, urb, qtd_list);

	return status;
}

static void scan_intr(struct fotg210_hcd *fotg210)
{
	struct fotg210_qh *qh;

	list_for_each_entry_safe(qh, fotg210->qh_scan_next,
			&fotg210->intr_qh_list, intr_node) {
rescan:
		/* clean any finished work for this qh */
		if (!list_empty(&qh->qtd_list)) {
			int temp;

			/*
			 * Unlinks could happen here; completion reporting
			 * drops the lock.  That's why fotg210->qh_scan_next
			 * always holds the next qh to scan; if the next qh
			 * gets unlinked then fotg210->qh_scan_next is adjusted
			 * in qh_unlink_periodic().
			 */
			temp = qh_completions(fotg210, qh);
			if (unlikely(qh->needs_rescan ||
					(list_empty(&qh->qtd_list) &&
					qh->qh_state == QH_STATE_LINKED)))
				start_unlink_intr(fotg210, qh);
			else if (temp != 0)
				goto rescan;
		}
	}
}

/* fotg210_iso_stream ops work with both ITD and SITD */

static struct fotg210_iso_stream *iso_stream_alloc(gfp_t mem_flags)
{
	struct fotg210_iso_stream *stream;

	stream = kzalloc(sizeof(*stream), mem_flags);
	if (likely(stream != NULL)) {
		INIT_LIST_HEAD(&stream->td_list);
		INIT_LIST_HEAD(&stream->free_list);
		stream->next_uframe = -1;
	}
	return stream;
}

static void iso_stream_init(struct fotg210_hcd *fotg210,
		struct fotg210_iso_stream *stream, struct usb_device *dev,
		int pipe, unsigned interval)
{
	u32 buf1;
	unsigned epnum, maxp;
	int is_input;
	long bandwidth;
	unsigned multi;
	struct usb_host_endpoint *ep;

	/*
	 * this might be a "high bandwidth" highspeed endpoint,
	 * as encoded in the ep descriptor's wMaxPacket field
	 */
	epnum = usb_pipeendpoint(pipe);
	is_input = usb_pipein(pipe) ? USB_DIR_IN : 0;
	ep = usb_pipe_endpoint(dev, pipe);
	maxp = usb_endpoint_maxp(&ep->desc);
	if (is_input)
		buf1 = (1 << 11);
	else
		buf1 = 0;

	multi = usb_endpoint_maxp_mult(&ep->desc);
	buf1 |= maxp;
	maxp *= multi;

	stream->buf0 = cpu_to_hc32(fotg210, (epnum << 8) | dev->devnum);
	stream->buf1 = cpu_to_hc32(fotg210, buf1);
	stream->buf2 = cpu_to_hc32(fotg210, multi);

	/* usbfs wants to report the average usecs per frame tied up
	 * when transfers on this endpoint are scheduled ...
	 */
	if (dev->speed == USB_SPEED_FULL) {
		interval <<= 3;
		stream->usecs = NS_TO_US(usb_calc_bus_time(dev->speed,
				is_input, 1, maxp));
		stream->usecs /= 8;
	} else {
		stream->highspeed = 1;
		stream->usecs = HS_USECS_ISO(maxp);
	}
	bandwidth = stream->usecs * 8;
	bandwidth /= interval;

	stream->bandwidth = bandwidth;
	stream->udev = dev;
	stream->bEndpointAddress = is_input | epnum;
	stream->interval = interval;
	stream->maxp = maxp;
}

static struct fotg210_iso_stream *iso_stream_find(struct fotg210_hcd *fotg210,
		struct urb *urb)
{
	unsigned epnum;
	struct fotg210_iso_stream *stream;
	struct usb_host_endpoint *ep;
	unsigned long flags;

	epnum = usb_pipeendpoint(urb->pipe);
	if (usb_pipein(urb->pipe))
		ep = urb->dev->ep_in[epnum];
	else
		ep = urb->dev->ep_out[epnum];

	spin_lock_irqsave(&fotg210->lock, flags);
	stream = ep->hcpriv;

	if (unlikely(stream == NULL)) {
		stream = iso_stream_alloc(GFP_ATOMIC);
		if (likely(stream != NULL)) {
			ep->hcpriv = stream;
			stream->ep = ep;
			iso_stream_init(fotg210, stream, urb->dev, urb->pipe,
					urb->interval);
		}

	/* if dev->ep[epnum] is a QH, hw is set */
	} else if (unlikely(stream->hw != NULL)) {
		fotg210_dbg(fotg210, "dev %s ep%d%s, not iso??\n",
				urb->dev->devpath, epnum,
				usb_pipein(urb->pipe) ? "in" : "out");
		stream = NULL;
	}

	spin_unlock_irqrestore(&fotg210->lock, flags);
	return stream;
}

/* fotg210_iso_sched ops can be ITD-only or SITD-only */

static struct fotg210_iso_sched *iso_sched_alloc(unsigned packets,
		gfp_t mem_flags)
{
	struct fotg210_iso_sched *iso_sched;

	iso_sched = kzalloc(struct_size(iso_sched, packet, packets), mem_flags);
	if (likely(iso_sched != NULL))
		INIT_LIST_HEAD(&iso_sched->td_list);

	return iso_sched;
}

static inline void itd_sched_init(struct fotg210_hcd *fotg210,
		struct fotg210_iso_sched *iso_sched,
		struct fotg210_iso_stream *stream, struct urb *urb)
{
	unsigned i;
	dma_addr_t dma = urb->transfer_dma;

	/* how many uframes are needed for these transfers */
	iso_sched->span = urb->number_of_packets * stream->interval;

	/* figure out per-uframe itd fields that we'll need later
	 * when we fit new itds into the schedule.
	 */
	for (i = 0; i < urb->number_of_packets; i++) {
		struct fotg210_iso_packet *uframe = &iso_sched->packet[i];
		unsigned length;
		dma_addr_t buf;
		u32 trans;

		length = urb->iso_frame_desc[i].length;
		buf = dma + urb->iso_frame_desc[i].offset;

		trans = FOTG210_ISOC_ACTIVE;
		trans |= buf & 0x0fff;
		if (unlikely(((i + 1) == urb->number_of_packets))
				&& !(urb->transfer_flags & URB_NO_INTERRUPT))
			trans |= FOTG210_ITD_IOC;
		trans |= length << 16;
		uframe->transaction = cpu_to_hc32(fotg210, trans);

		/* might need to cross a buffer page within a uframe */
		uframe->bufp = (buf & ~(u64)0x0fff);
		buf += length;
		if (unlikely((uframe->bufp != (buf & ~(u64)0x0fff))))
			uframe->cross = 1;
	}
}

static void iso_sched_free(struct fotg210_iso_stream *stream,
		struct fotg210_iso_sched *iso_sched)
{
	if (!iso_sched)
		return;
	/* caller must hold fotg210->lock!*/
	list_splice(&iso_sched->td_list, &stream->free_list);
	kfree(iso_sched);
}

static int itd_urb_transaction(struct fotg210_iso_stream *stream,
		struct fotg210_hcd *fotg210, struct urb *urb, gfp_t mem_flags)
{
	struct fotg210_itd *itd;
	dma_addr_t itd_dma;
	int i;
	unsigned num_itds;
	struct fotg210_iso_sched *sched;
	unsigned long flags;

	sched = iso_sched_alloc(urb->number_of_packets, mem_flags);
	if (unlikely(sched == NULL))
		return -ENOMEM;

	itd_sched_init(fotg210, sched, stream, urb);

	if (urb->interval < 8)
		num_itds = 1 + (sched->span + 7) / 8;
	else
		num_itds = urb->number_of_packets;

	/* allocate/init ITDs */
	spin_lock_irqsave(&fotg210->lock, flags);
	for (i = 0; i < num_itds; i++) {

		/*
		 * Use iTDs from the free list, but not iTDs that may
		 * still be in use by the hardware.
		 */
		if (likely(!list_empty(&stream->free_list))) {
			itd = list_first_entry(&stream->free_list,
					struct fotg210_itd, itd_list);
			if (itd->frame == fotg210->now_frame)
				goto alloc_itd;
			list_del(&itd->itd_list);
			itd_dma = itd->itd_dma;
		} else {
alloc_itd:
			spin_unlock_irqrestore(&fotg210->lock, flags);
			itd = dma_pool_alloc(fotg210->itd_pool, mem_flags,
					&itd_dma);
			spin_lock_irqsave(&fotg210->lock, flags);
			if (!itd) {
				iso_sched_free(stream, sched);
				spin_unlock_irqrestore(&fotg210->lock, flags);
				return -ENOMEM;
			}
		}

		memset(itd, 0, sizeof(*itd));
		itd->itd_dma = itd_dma;
		list_add(&itd->itd_list, &sched->td_list);
	}
	spin_unlock_irqrestore(&fotg210->lock, flags);

	/* temporarily store schedule info in hcpriv */
	urb->hcpriv = sched;
	urb->error_count = 0;
	return 0;
}

static inline int itd_slot_ok(struct fotg210_hcd *fotg210, u32 mod, u32 uframe,
		u8 usecs, u32 period)
{
	uframe %= period;
	do {
		/* can't commit more than uframe_periodic_max usec */
		if (periodic_usecs(fotg210, uframe >> 3, uframe & 0x7)
				> (fotg210->uframe_periodic_max - usecs))
			return 0;

		/* we know urb->interval is 2^N uframes */
		uframe += period;
	} while (uframe < mod);
	return 1;
}

/* This scheduler plans almost as far into the future as it has actual
 * periodic schedule slots.  (Affected by TUNE_FLS, which defaults to
 * "as small as possible" to be cache-friendlier.)  That limits the size
 * transfers you can stream reliably; avoid more than 64 msec per urb.
 * Also avoid queue depths of less than fotg210's worst irq latency (affected
 * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
 * and other factors); or more than about 230 msec total (for portability,
 * given FOTG210_TUNE_FLS and the slop).  Or, write a smarter scheduler!
 */

#define SCHEDULE_SLOP 80 /* microframes */

static int iso_stream_schedule(struct fotg210_hcd *fotg210, struct urb *urb,
		struct fotg210_iso_stream *stream)
{
	u32 now, next, start, period, span;
	int status;
	unsigned mod = fotg210->periodic_size << 3;
	struct fotg210_iso_sched *sched = urb->hcpriv;

	period = urb->interval;
	span = sched->span;

	if (span > mod - SCHEDULE_SLOP) {
		fotg210_dbg(fotg210, "iso request %p too long\n", urb);
		status = -EFBIG;
		goto fail;
	}

	now = fotg210_read_frame_index(fotg210) & (mod - 1);

	/* Typical case: reuse current schedule, stream is still active.
	 * Hopefully there are no gaps from the host falling behind
	 * (irq delays etc), but if there are we'll take the next
	 * slot in the schedule, implicitly assuming URB_ISO_ASAP.
	 */
	if (likely(!list_empty(&stream->td_list))) {
		u32 excess;

		/* For high speed devices, allow scheduling within the
		 * isochronous scheduling threshold.  For full speed devices
		 * and Intel PCI-based controllers, don't (work around for
		 * Intel ICH9 bug).
		 */
		if (!stream->highspeed && fotg210->fs_i_thresh)
			next = now + fotg210->i_thresh;
		else
			next = now;

		/* Fell behind (by up to twice the slop amount)?
		 * We decide based on the time of the last currently-scheduled
		 * slot, not the time of the next available slot.
		 */
		excess = (stream->next_uframe - period - next) & (mod - 1);
		if (excess >= mod - 2 * SCHEDULE_SLOP)
			start = next + excess - mod + period *
					DIV_ROUND_UP(mod - excess, period);
		else
			start = next + excess + period;
		if (start - now >= mod) {
			fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n",
					urb, start - now - period, period,
					mod);
			status = -EFBIG;
			goto fail;
		}
	}

	/* need to schedule; when's the next (u)frame we could start?
	 * this is bigger than fotg210->i_thresh allows; scheduling itself
	 * isn't free, the slop should handle reasonably slow cpus.  it
	 * can also help high bandwidth if the dma and irq loads don't
	 * jump until after the queue is primed.
	 */
	else {
		int done = 0;

		start = SCHEDULE_SLOP + (now & ~0x07);

		/* NOTE:  assumes URB_ISO_ASAP, to limit complexity/bugs */

		/* find a uframe slot with enough bandwidth.
		 * Early uframes are more precious because full-speed
		 * iso IN transfers can't use late uframes,
		 * and therefore they should be allocated last.
		 */
		next = start;
		start += period;
		do {
			start--;
			/* check schedule: enough space? */
			if (itd_slot_ok(fotg210, mod, start,
					stream->usecs, period))
				done = 1;
		} while (start > next && !done);

		/* no room in the schedule */
		if (!done) {
			fotg210_dbg(fotg210, "iso resched full %p (now %d max %d)\n",
					urb, now, now + mod);
			status = -ENOSPC;
			goto fail;
		}
	}

	/* Tried to schedule too far into the future? */
	if (unlikely(start - now + span - period >=
			mod - 2 * SCHEDULE_SLOP)) {
		fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n",
				urb, start - now, span - period,
				mod - 2 * SCHEDULE_SLOP);
		status = -EFBIG;
		goto fail;
	}

	stream->next_uframe = start & (mod - 1);

	/* report high speed start in uframes; full speed, in frames */
	urb->start_frame = stream->next_uframe;
	if (!stream->highspeed)
		urb->start_frame >>= 3;

	/* Make sure scan_isoc() sees these */
	if (fotg210->isoc_count == 0)
		fotg210->next_frame = now >> 3;
	return 0;

fail:
	iso_sched_free(stream, sched);
	urb->hcpriv = NULL;
	return status;
}

static inline void itd_init(struct fotg210_hcd *fotg210,
		struct fotg210_iso_stream *stream, struct fotg210_itd *itd)
{
	int i;

	/* it's been recently zeroed */
	itd->hw_next = FOTG210_LIST_END(fotg210);
	itd->hw_bufp[0] = stream->buf0;
	itd->hw_bufp[1] = stream->buf1;
	itd->hw_bufp[2] = stream->buf2;

	for (i = 0; i < 8; i++)
		itd->index[i] = -1;

	/* All other fields are filled when scheduling */
}

static inline void itd_patch(struct fotg210_hcd *fotg210,
		struct fotg210_itd *itd, struct fotg210_iso_sched *iso_sched,
		unsigned index, u16 uframe)
{
	struct fotg210_iso_packet *uf = &iso_sched->packet[index];
	unsigned pg = itd->pg;

	uframe &= 0x07;
	itd->index[uframe] = index;

	itd->hw_transaction[uframe] = uf->transaction;
	itd->hw_transaction[uframe] |= cpu_to_hc32(fotg210, pg << 12);
	itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, uf->bufp & ~(u32)0);
	itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(uf->bufp >> 32));

	/* iso_frame_desc[].offset must be strictly increasing */
	if (unlikely(uf->cross)) {
		u64 bufp = uf->bufp + 4096;

		itd->pg = ++pg;
		itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, bufp & ~(u32)0);
		itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(bufp >> 32));
	}
}

static inline void itd_link(struct fotg210_hcd *fotg210, unsigned frame,
		struct fotg210_itd *itd)
{
	union fotg210_shadow *prev = &fotg210->pshadow[frame];
	__hc32 *hw_p = &fotg210->periodic[frame];
	union fotg210_shadow here = *prev;
	__hc32 type = 0;

	/* skip any iso nodes which might belong to previous microframes */
	while (here.ptr) {
		type = Q_NEXT_TYPE(fotg210, *hw_p);
		if (type == cpu_to_hc32(fotg210, Q_TYPE_QH))
			break;
		prev = periodic_next_shadow(fotg210, prev, type);
		hw_p = shadow_next_periodic(fotg210, &here, type);
		here = *prev;
	}

	itd->itd_next = here;
	itd->hw_next = *hw_p;
	prev->itd = itd;
	itd->frame = frame;
	wmb();
	*hw_p = cpu_to_hc32(fotg210, itd->itd_dma | Q_TYPE_ITD);
}

/* fit urb's itds into the selected schedule slot; activate as needed */
static void itd_link_urb(struct fotg210_hcd *fotg210, struct urb *urb,
		unsigned mod, struct fotg210_iso_stream *stream)
{
	int packet;
	unsigned next_uframe, uframe, frame;
	struct fotg210_iso_sched *iso_sched = urb->hcpriv;
	struct fotg210_itd *itd;

	next_uframe = stream->next_uframe & (mod - 1);

	if (unlikely(list_empty(&stream->td_list))) {
		fotg210_to_hcd(fotg210)->self.bandwidth_allocated
				+= stream->bandwidth;
		fotg210_dbg(fotg210,
			"schedule devp %s ep%d%s-iso period %d start %d.%d\n",
			urb->dev->devpath, stream->bEndpointAddress & 0x0f,
			(stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
			urb->interval,
			next_uframe >> 3, next_uframe & 0x7);
	}

	/* fill iTDs uframe by uframe */
	for (packet = 0, itd = NULL; packet < urb->number_of_packets;) {
		if (itd == NULL) {
			/* ASSERT:  we have all necessary itds */

			/* ASSERT:  no itds for this endpoint in this uframe */

			itd = list_entry(iso_sched->td_list.next,
					struct fotg210_itd, itd_list);
			list_move_tail(&itd->itd_list, &stream->td_list);
			itd->stream = stream;
			itd->urb = urb;
			itd_init(fotg210, stream, itd);
		}

		uframe = next_uframe & 0x07;
		frame = next_uframe >> 3;

		itd_patch(fotg210, itd, iso_sched, packet, uframe);

		next_uframe += stream->interval;
		next_uframe &= mod - 1;
		packet++;

		/* link completed itds into the schedule */
		if (((next_uframe >> 3) != frame)
				|| packet == urb->number_of_packets) {
			itd_link(fotg210, frame & (fotg210->periodic_size - 1),
					itd);
			itd = NULL;
		}
	}
	stream->next_uframe = next_uframe;

	/* don't need that schedule data any more */
	iso_sched_free(stream, iso_sched);
	urb->hcpriv = NULL;

	++fotg210->isoc_count;
	enable_periodic(fotg210);
}

#define ISO_ERRS (FOTG210_ISOC_BUF_ERR | FOTG210_ISOC_BABBLE |\
		FOTG210_ISOC_XACTERR)

/* Process and recycle a completed ITD.  Return true iff its urb completed,
 * and hence its completion callback probably added things to the hardware
 * schedule.
 *
 * Note that we carefully avoid recycling this descriptor until after any
 * completion callback runs, so that it won't be reused quickly.  That is,
 * assuming (a) no more than two urbs per frame on this endpoint, and also
 * (b) only this endpoint's completions submit URBs.  It seems some silicon
 * corrupts things if you reuse completed descriptors very quickly...
 */
static bool itd_complete(struct fotg210_hcd *fotg210, struct fotg210_itd *itd)
{
	struct urb *urb = itd->urb;
	struct usb_iso_packet_descriptor *desc;
	u32 t;
	unsigned uframe;
	int urb_index = -1;
	struct fotg210_iso_stream *stream = itd->stream;
	struct usb_device *dev;
	bool retval = false;

	/* for each uframe with a packet */
	for (uframe = 0; uframe < 8; uframe++) {
		if (likely(itd->index[uframe] == -1))
			continue;
		urb_index = itd->index[uframe];
		desc = &urb->iso_frame_desc[urb_index];

		t = hc32_to_cpup(fotg210, &itd->hw_transaction[uframe]);
		itd->hw_transaction[uframe] = 0;

		/* report transfer status */
		if (unlikely(t & ISO_ERRS)) {
			urb->error_count++;
			if (t & FOTG210_ISOC_BUF_ERR)
				desc->status = usb_pipein(urb->pipe)
					? -ENOSR  /* hc couldn't read */
					: -ECOMM; /* hc couldn't write */
			else if (t & FOTG210_ISOC_BABBLE)
				desc->status = -EOVERFLOW;
			else /* (t & FOTG210_ISOC_XACTERR) */
				desc->status = -EPROTO;

			/* HC need not update length with this error */
			if (!(t & FOTG210_ISOC_BABBLE)) {
				desc->actual_length = FOTG210_ITD_LENGTH(t);
				urb->actual_length += desc->actual_length;
			}
		} else if (likely((t & FOTG210_ISOC_ACTIVE) == 0)) {
			desc->status = 0;
			desc->actual_length = FOTG210_ITD_LENGTH(t);
			urb->actual_length += desc->actual_length;
		} else {
			/* URB was too late */
			desc->status = -EXDEV;
		}
	}

	/* handle completion now? */
	if (likely((urb_index + 1) != urb->number_of_packets))
		goto done;

	/* ASSERT: it's really the last itd for this urb
	 * list_for_each_entry (itd, &stream->td_list, itd_list)
	 *	BUG_ON (itd->urb == urb);
	 */

	/* give urb back to the driver; completion often (re)submits */
	dev = urb->dev;
	fotg210_urb_done(fotg210, urb, 0);
	retval = true;
	urb = NULL;

	--fotg210->isoc_count;
	disable_periodic(fotg210);

	if (unlikely(list_is_singular(&stream->td_list))) {
		fotg210_to_hcd(fotg210)->self.bandwidth_allocated
				-= stream->bandwidth;
		fotg210_dbg(fotg210,
			"deschedule devp %s ep%d%s-iso\n",
			dev->devpath, stream->bEndpointAddress & 0x0f,
			(stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
	}

done:
	itd->urb = NULL;

	/* Add to the end of the free list for later reuse */
	list_move_tail(&itd->itd_list, &stream->free_list);

	/* Recycle the iTDs when the pipeline is empty (ep no longer in use) */
	if (list_empty(&stream->td_list)) {
		list_splice_tail_init(&stream->free_list,
				&fotg210->cached_itd_list);
		start_free_itds(fotg210);
	}

	return retval;
}

static int itd_submit(struct fotg210_hcd *fotg210, struct urb *urb,
		gfp_t mem_flags)
{
	int status = -EINVAL;
	unsigned long flags;
	struct fotg210_iso_stream *stream;

	/* Get iso_stream head */
	stream = iso_stream_find(fotg210, urb);
	if (unlikely(stream == NULL)) {
		fotg210_dbg(fotg210, "can't get iso stream\n");
		return -ENOMEM;
	}
	if (unlikely(urb->interval != stream->interval &&
			fotg210_port_speed(fotg210, 0) ==
			USB_PORT_STAT_HIGH_SPEED)) {
		fotg210_dbg(fotg210, "can't change iso interval %d --> %d\n",
				stream->interval, urb->interval);
		goto done;
	}

#ifdef FOTG210_URB_TRACE
	fotg210_dbg(fotg210,
			"%s %s urb %p ep%d%s len %d, %d pkts %d uframes[%p]\n",
			__func__, urb->dev->devpath, urb,
			usb_pipeendpoint(urb->pipe),
			usb_pipein(urb->pipe) ? "in" : "out",
			urb->transfer_buffer_length,
			urb->number_of_packets, urb->interval,
			stream);
#endif

	/* allocate ITDs w/o locking anything */
	status = itd_urb_transaction(stream, fotg210, urb, mem_flags);
	if (unlikely(status < 0)) {
		fotg210_dbg(fotg210, "can't init itds\n");
		goto done;
	}

	/* schedule ... need to lock */
	spin_lock_irqsave(&fotg210->lock, flags);
	if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) {
		status = -ESHUTDOWN;
		goto done_not_linked;
	}
	status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb);
	if (unlikely(status))
		goto done_not_linked;
	status = iso_stream_schedule(fotg210, urb, stream);
	if (likely(status == 0))
		itd_link_urb(fotg210, urb, fotg210->periodic_size << 3, stream);
	else
		usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
done_not_linked:
	spin_unlock_irqrestore(&fotg210->lock, flags);
done:
	return status;
}

static inline int scan_frame_queue(struct fotg210_hcd *fotg210, unsigned frame,
		unsigned now_frame, bool live)
{
	unsigned uf;
	bool modified;
	union fotg210_shadow q, *q_p;
	__hc32 type, *hw_p;

	/* scan each element in frame's queue for completions */
	q_p = &fotg210->pshadow[frame];
	hw_p = &fotg210->periodic[frame];
	q.ptr = q_p->ptr;
	type = Q_NEXT_TYPE(fotg210, *hw_p);
	modified = false;

	while (q.ptr) {
		switch (hc32_to_cpu(fotg210, type)) {
		case Q_TYPE_ITD:
			/* If this ITD is still active, leave it for
			 * later processing ... check the next entry.
			 * No need to check for activity unless the
			 * frame is current.
			 */
			if (frame == now_frame && live) {
				rmb();
				for (uf = 0; uf < 8; uf++) {
					if (q.itd->hw_transaction[uf] &
							ITD_ACTIVE(fotg210))
						break;
				}
				if (uf < 8) {
					q_p = &q.itd->itd_next;
					hw_p = &q.itd->hw_next;
					type = Q_NEXT_TYPE(fotg210,
							q.itd->hw_next);
					q = *q_p;
					break;
				}
			}

			/* Take finished ITDs out of the schedule
			 * and process them:  recycle, maybe report
			 * URB completion.  HC won't cache the
			 * pointer for much longer, if at all.
			 */
			*q_p = q.itd->itd_next;
			*hw_p = q.itd->hw_next;
			type = Q_NEXT_TYPE(fotg210, q.itd->hw_next);
			wmb();
			modified = itd_complete(fotg210, q.itd);
			q = *q_p;
			break;
		default:
			fotg210_dbg(fotg210, "corrupt type %d frame %d shadow %p\n",
					type, frame, q.ptr);
			fallthrough;
		case Q_TYPE_QH:
		case Q_TYPE_FSTN:
			/* End of the iTDs and siTDs */
			q.ptr = NULL;
			break;
		}

		/* assume completion callbacks modify the queue */
		if (unlikely(modified && fotg210->isoc_count > 0))
			return -EINVAL;
	}
	return 0;
}

static void scan_isoc(struct fotg210_hcd *fotg210)
{
	unsigned uf, now_frame, frame, ret;
	unsigned fmask = fotg210->periodic_size - 1;
	bool live;

	/*
	 * When running, scan from last scan point up to "now"
	 * else clean up by scanning everything that's left.
	 * Touches as few pages as possible:  cache-friendly.
	 */
	if (fotg210->rh_state >= FOTG210_RH_RUNNING) {
		uf = fotg210_read_frame_index(fotg210);
		now_frame = (uf >> 3) & fmask;
		live = true;
	} else  {
		now_frame = (fotg210->next_frame - 1) & fmask;
		live = false;
	}
	fotg210->now_frame = now_frame;

	frame = fotg210->next_frame;
	for (;;) {
		ret = 1;
		while (ret != 0)
			ret = scan_frame_queue(fotg210, frame,
					now_frame, live);

		/* Stop when we have reached the current frame */
		if (frame == now_frame)
			break;
		frame = (frame + 1) & fmask;
	}
	fotg210->next_frame = now_frame;
}

/* Display / Set uframe_periodic_max
 */
static ssize_t uframe_periodic_max_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct fotg210_hcd *fotg210;
	int n;

	fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev)));
	n = scnprintf(buf, PAGE_SIZE, "%d\n", fotg210->uframe_periodic_max);
	return n;
}


static ssize_t uframe_periodic_max_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct fotg210_hcd *fotg210;
	unsigned uframe_periodic_max;
	unsigned frame, uframe;
	unsigned short allocated_max;
	unsigned long flags;
	ssize_t ret;

	fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev)));
	if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
		return -EINVAL;

	if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
		fotg210_info(fotg210, "rejecting invalid request for uframe_periodic_max=%u\n",
				uframe_periodic_max);
		return -EINVAL;
	}

	ret = -EINVAL;

	/*
	 * lock, so that our checking does not race with possible periodic
	 * bandwidth allocation through submitting new urbs.
	 */
	spin_lock_irqsave(&fotg210->lock, flags);

	/*
	 * for request to decrease max periodic bandwidth, we have to check
	 * every microframe in the schedule to see whether the decrease is
	 * possible.
	 */
	if (uframe_periodic_max < fotg210->uframe_periodic_max) {
		allocated_max = 0;

		for (frame = 0; frame < fotg210->periodic_size; ++frame)
			for (uframe = 0; uframe < 7; ++uframe)
				allocated_max = max(allocated_max,
						periodic_usecs(fotg210, frame,
						uframe));

		if (allocated_max > uframe_periodic_max) {
			fotg210_info(fotg210,
					"cannot decrease uframe_periodic_max because periodic bandwidth is already allocated (%u > %u)\n",
					allocated_max, uframe_periodic_max);
			goto out_unlock;
		}
	}

	/* increasing is always ok */

	fotg210_info(fotg210,
			"setting max periodic bandwidth to %u%% (== %u usec/uframe)\n",
			100 * uframe_periodic_max/125, uframe_periodic_max);

	if (uframe_periodic_max != 100)
		fotg210_warn(fotg210, "max periodic bandwidth set is non-standard\n");

	fotg210->uframe_periodic_max = uframe_periodic_max;
	ret = count;

out_unlock:
	spin_unlock_irqrestore(&fotg210->lock, flags);
	return ret;
}

static DEVICE_ATTR_RW(uframe_periodic_max);

static inline int create_sysfs_files(struct fotg210_hcd *fotg210)
{
	struct device *controller = fotg210_to_hcd(fotg210)->self.controller;

	return device_create_file(controller, &dev_attr_uframe_periodic_max);
}

static inline void remove_sysfs_files(struct fotg210_hcd *fotg210)
{
	struct device *controller = fotg210_to_hcd(fotg210)->self.controller;

	device_remove_file(controller, &dev_attr_uframe_periodic_max);
}
/* On some systems, leaving remote wakeup enabled prevents system shutdown.
 * The firmware seems to think that powering off is a wakeup event!
 * This routine turns off remote wakeup and everything else, on all ports.
 */
static void fotg210_turn_off_all_ports(struct fotg210_hcd *fotg210)
{
	u32 __iomem *status_reg = &fotg210->regs->port_status;

	fotg210_writel(fotg210, PORT_RWC_BITS, status_reg);
}

/* Halt HC, turn off all ports, and let the BIOS use the companion controllers.
 * Must be called with interrupts enabled and the lock not held.
 */
static void fotg210_silence_controller(struct fotg210_hcd *fotg210)
{
	fotg210_halt(fotg210);

	spin_lock_irq(&fotg210->lock);
	fotg210->rh_state = FOTG210_RH_HALTED;
	fotg210_turn_off_all_ports(fotg210);
	spin_unlock_irq(&fotg210->lock);
}

/* fotg210_shutdown kick in for silicon on any bus (not just pci, etc).
 * This forcibly disables dma and IRQs, helping kexec and other cases
 * where the next system software may expect clean state.
 */
static void fotg210_shutdown(struct usb_hcd *hcd)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);

	spin_lock_irq(&fotg210->lock);
	fotg210->shutdown = true;
	fotg210->rh_state = FOTG210_RH_STOPPING;
	fotg210->enabled_hrtimer_events = 0;
	spin_unlock_irq(&fotg210->lock);

	fotg210_silence_controller(fotg210);

	hrtimer_cancel(&fotg210->hrtimer);
}

/* fotg210_work is called from some interrupts, timers, and so on.
 * it calls driver completion functions, after dropping fotg210->lock.
 */
static void fotg210_work(struct fotg210_hcd *fotg210)
{
	/* another CPU may drop fotg210->lock during a schedule scan while
	 * it reports urb completions.  this flag guards against bogus
	 * attempts at re-entrant schedule scanning.
	 */
	if (fotg210->scanning) {
		fotg210->need_rescan = true;
		return;
	}
	fotg210->scanning = true;

rescan:
	fotg210->need_rescan = false;
	if (fotg210->async_count)
		scan_async(fotg210);
	if (fotg210->intr_count > 0)
		scan_intr(fotg210);
	if (fotg210->isoc_count > 0)
		scan_isoc(fotg210);
	if (fotg210->need_rescan)
		goto rescan;
	fotg210->scanning = false;

	/* the IO watchdog guards against hardware or driver bugs that
	 * misplace IRQs, and should let us run completely without IRQs.
	 * such lossage has been observed on both VT6202 and VT8235.
	 */
	turn_on_io_watchdog(fotg210);
}

/* Called when the fotg210_hcd module is removed.
 */
static void fotg210_stop(struct usb_hcd *hcd)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);

	fotg210_dbg(fotg210, "stop\n");

	/* no more interrupts ... */

	spin_lock_irq(&fotg210->lock);
	fotg210->enabled_hrtimer_events = 0;
	spin_unlock_irq(&fotg210->lock);

	fotg210_quiesce(fotg210);
	fotg210_silence_controller(fotg210);
	fotg210_reset(fotg210);

	hrtimer_cancel(&fotg210->hrtimer);
	remove_sysfs_files(fotg210);
	remove_debug_files(fotg210);

	/* root hub is shut down separately (first, when possible) */
	spin_lock_irq(&fotg210->lock);
	end_free_itds(fotg210);
	spin_unlock_irq(&fotg210->lock);
	fotg210_mem_cleanup(fotg210);

#ifdef FOTG210_STATS
	fotg210_dbg(fotg210, "irq normal %ld err %ld iaa %ld (lost %ld)\n",
			fotg210->stats.normal, fotg210->stats.error,
			fotg210->stats.iaa, fotg210->stats.lost_iaa);
	fotg210_dbg(fotg210, "complete %ld unlink %ld\n",
			fotg210->stats.complete, fotg210->stats.unlink);
#endif

	dbg_status(fotg210, "fotg210_stop completed",
			fotg210_readl(fotg210, &fotg210->regs->status));
}

/* one-time init, only for memory state */
static int hcd_fotg210_init(struct usb_hcd *hcd)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	u32 temp;
	int retval;
	u32 hcc_params;
	struct fotg210_qh_hw *hw;

	spin_lock_init(&fotg210->lock);

	/*
	 * keep io watchdog by default, those good HCDs could turn off it later
	 */
	fotg210->need_io_watchdog = 1;

	hrtimer_init(&fotg210->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
	fotg210->hrtimer.function = fotg210_hrtimer_func;
	fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT;

	hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params);

	/*
	 * by default set standard 80% (== 100 usec/uframe) max periodic
	 * bandwidth as required by USB 2.0
	 */
	fotg210->uframe_periodic_max = 100;

	/*
	 * hw default: 1K periodic list heads, one per frame.
	 * periodic_size can shrink by USBCMD update if hcc_params allows.
	 */
	fotg210->periodic_size = DEFAULT_I_TDPS;
	INIT_LIST_HEAD(&fotg210->intr_qh_list);
	INIT_LIST_HEAD(&fotg210->cached_itd_list);

	if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
		/* periodic schedule size can be smaller than default */
		switch (FOTG210_TUNE_FLS) {
		case 0:
			fotg210->periodic_size = 1024;
			break;
		case 1:
			fotg210->periodic_size = 512;
			break;
		case 2:
			fotg210->periodic_size = 256;
			break;
		default:
			BUG();
		}
	}
	retval = fotg210_mem_init(fotg210, GFP_KERNEL);
	if (retval < 0)
		return retval;

	/* controllers may cache some of the periodic schedule ... */
	fotg210->i_thresh = 2;

	/*
	 * dedicate a qh for the async ring head, since we couldn't unlink
	 * a 'real' qh without stopping the async schedule [4.8].  use it
	 * as the 'reclamation list head' too.
	 * its dummy is used in hw_alt_next of many tds, to prevent the qh
	 * from automatically advancing to the next td after short reads.
	 */
	fotg210->async->qh_next.qh = NULL;
	hw = fotg210->async->hw;
	hw->hw_next = QH_NEXT(fotg210, fotg210->async->qh_dma);
	hw->hw_info1 = cpu_to_hc32(fotg210, QH_HEAD);
	hw->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT);
	hw->hw_qtd_next = FOTG210_LIST_END(fotg210);
	fotg210->async->qh_state = QH_STATE_LINKED;
	hw->hw_alt_next = QTD_NEXT(fotg210, fotg210->async->dummy->qtd_dma);

	/* clear interrupt enables, set irq latency */
	if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
		log2_irq_thresh = 0;
	temp = 1 << (16 + log2_irq_thresh);
	if (HCC_CANPARK(hcc_params)) {
		/* HW default park == 3, on hardware that supports it (like
		 * NVidia and ALI silicon), maximizes throughput on the async
		 * schedule by avoiding QH fetches between transfers.
		 *
		 * With fast usb storage devices and NForce2, "park" seems to
		 * make problems:  throughput reduction (!), data errors...
		 */
		if (park) {
			park = min_t(unsigned, park, 3);
			temp |= CMD_PARK;
			temp |= park << 8;
		}
		fotg210_dbg(fotg210, "park %d\n", park);
	}
	if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
		/* periodic schedule size can be smaller than default */
		temp &= ~(3 << 2);
		temp |= (FOTG210_TUNE_FLS << 2);
	}
	fotg210->command = temp;

	/* Accept arbitrarily long scatter-gather lists */
	if (!hcd->localmem_pool)
		hcd->self.sg_tablesize = ~0;
	return 0;
}

/* start HC running; it's halted, hcd_fotg210_init() has been run (once) */
static int fotg210_run(struct usb_hcd *hcd)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	u32 temp;

	hcd->uses_new_polling = 1;

	/* EHCI spec section 4.1 */

	fotg210_writel(fotg210, fotg210->periodic_dma,
			&fotg210->regs->frame_list);
	fotg210_writel(fotg210, (u32)fotg210->async->qh_dma,
			&fotg210->regs->async_next);

	/*
	 * hcc_params controls whether fotg210->regs->segment must (!!!)
	 * be used; it constrains QH/ITD/SITD and QTD locations.
	 * dma_pool consistent memory always uses segment zero.
	 * streaming mappings for I/O buffers, like dma_map_single(),
	 * can return segments above 4GB, if the device allows.
	 *
	 * NOTE:  the dma mask is visible through dev->dma_mask, so
	 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
	 * Scsi_Host.highmem_io, and so forth.  It's readonly to all
	 * host side drivers though.
	 */
	fotg210_readl(fotg210, &fotg210->caps->hcc_params);

	/*
	 * Philips, Intel, and maybe others need CMD_RUN before the
	 * root hub will detect new devices (why?); NEC doesn't
	 */
	fotg210->command &= ~(CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
	fotg210->command |= CMD_RUN;
	fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
	dbg_cmd(fotg210, "init", fotg210->command);

	/*
	 * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
	 * are explicitly handed to companion controller(s), so no TT is
	 * involved with the root hub.  (Except where one is integrated,
	 * and there's no companion controller unless maybe for USB OTG.)
	 *
	 * Turning on the CF flag will transfer ownership of all ports
	 * from the companions to the EHCI controller.  If any of the
	 * companions are in the middle of a port reset at the time, it
	 * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
	 * guarantees that no resets are in progress.  After we set CF,
	 * a short delay lets the hardware catch up; new resets shouldn't
	 * be started before the port switching actions could complete.
	 */
	down_write(&ehci_cf_port_reset_rwsem);
	fotg210->rh_state = FOTG210_RH_RUNNING;
	/* unblock posted writes */
	fotg210_readl(fotg210, &fotg210->regs->command);
	usleep_range(5000, 10000);
	up_write(&ehci_cf_port_reset_rwsem);
	fotg210->last_periodic_enable = ktime_get_real();

	temp = HC_VERSION(fotg210,
			fotg210_readl(fotg210, &fotg210->caps->hc_capbase));
	fotg210_info(fotg210,
			"USB %x.%x started, EHCI %x.%02x\n",
			((fotg210->sbrn & 0xf0) >> 4), (fotg210->sbrn & 0x0f),
			temp >> 8, temp & 0xff);

	fotg210_writel(fotg210, INTR_MASK,
			&fotg210->regs->intr_enable); /* Turn On Interrupts */

	/* GRR this is run-once init(), being done every time the HC starts.
	 * So long as they're part of class devices, we can't do it init()
	 * since the class device isn't created that early.
	 */
	create_debug_files(fotg210);
	create_sysfs_files(fotg210);

	return 0;
}

static int fotg210_setup(struct usb_hcd *hcd)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	int retval;

	fotg210->regs = (void __iomem *)fotg210->caps +
			HC_LENGTH(fotg210,
			fotg210_readl(fotg210, &fotg210->caps->hc_capbase));
	dbg_hcs_params(fotg210, "reset");
	dbg_hcc_params(fotg210, "reset");

	/* cache this readonly data; minimize chip reads */
	fotg210->hcs_params = fotg210_readl(fotg210,
			&fotg210->caps->hcs_params);

	fotg210->sbrn = HCD_USB2;

	/* data structure init */
	retval = hcd_fotg210_init(hcd);
	if (retval)
		return retval;

	retval = fotg210_halt(fotg210);
	if (retval)
		return retval;

	fotg210_reset(fotg210);

	return 0;
}

static irqreturn_t fotg210_irq(struct usb_hcd *hcd)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	u32 status, masked_status, pcd_status = 0, cmd;
	int bh;

	spin_lock(&fotg210->lock);

	status = fotg210_readl(fotg210, &fotg210->regs->status);

	/* e.g. cardbus physical eject */
	if (status == ~(u32) 0) {
		fotg210_dbg(fotg210, "device removed\n");
		goto dead;
	}

	/*
	 * We don't use STS_FLR, but some controllers don't like it to
	 * remain on, so mask it out along with the other status bits.
	 */
	masked_status = status & (INTR_MASK | STS_FLR);

	/* Shared IRQ? */
	if (!masked_status ||
			unlikely(fotg210->rh_state == FOTG210_RH_HALTED)) {
		spin_unlock(&fotg210->lock);
		return IRQ_NONE;
	}

	/* clear (just) interrupts */
	fotg210_writel(fotg210, masked_status, &fotg210->regs->status);
	cmd = fotg210_readl(fotg210, &fotg210->regs->command);
	bh = 0;

	/* unrequested/ignored: Frame List Rollover */
	dbg_status(fotg210, "irq", status);

	/* INT, ERR, and IAA interrupt rates can be throttled */

	/* normal [4.15.1.2] or error [4.15.1.1] completion */
	if (likely((status & (STS_INT|STS_ERR)) != 0)) {
		if (likely((status & STS_ERR) == 0))
			INCR(fotg210->stats.normal);
		else
			INCR(fotg210->stats.error);
		bh = 1;
	}

	/* complete the unlinking of some qh [4.15.2.3] */
	if (status & STS_IAA) {

		/* Turn off the IAA watchdog */
		fotg210->enabled_hrtimer_events &=
			~BIT(FOTG210_HRTIMER_IAA_WATCHDOG);

		/*
		 * Mild optimization: Allow another IAAD to reset the
		 * hrtimer, if one occurs before the next expiration.
		 * In theory we could always cancel the hrtimer, but
		 * tests show that about half the time it will be reset
		 * for some other event anyway.
		 */
		if (fotg210->next_hrtimer_event == FOTG210_HRTIMER_IAA_WATCHDOG)
			++fotg210->next_hrtimer_event;

		/* guard against (alleged) silicon errata */
		if (cmd & CMD_IAAD)
			fotg210_dbg(fotg210, "IAA with IAAD still set?\n");
		if (fotg210->async_iaa) {
			INCR(fotg210->stats.iaa);
			end_unlink_async(fotg210);
		} else
			fotg210_dbg(fotg210, "IAA with nothing unlinked?\n");
	}

	/* remote wakeup [4.3.1] */
	if (status & STS_PCD) {
		int pstatus;
		u32 __iomem *status_reg = &fotg210->regs->port_status;

		/* kick root hub later */
		pcd_status = status;

		/* resume root hub? */
		if (fotg210->rh_state == FOTG210_RH_SUSPENDED)
			usb_hcd_resume_root_hub(hcd);

		pstatus = fotg210_readl(fotg210, status_reg);

		if (test_bit(0, &fotg210->suspended_ports) &&
				((pstatus & PORT_RESUME) ||
				!(pstatus & PORT_SUSPEND)) &&
				(pstatus & PORT_PE) &&
				fotg210->reset_done[0] == 0) {

			/* start 20 msec resume signaling from this port,
			 * and make hub_wq collect PORT_STAT_C_SUSPEND to
			 * stop that signaling.  Use 5 ms extra for safety,
			 * like usb_port_resume() does.
			 */
			fotg210->reset_done[0] = jiffies + msecs_to_jiffies(25);
			set_bit(0, &fotg210->resuming_ports);
			fotg210_dbg(fotg210, "port 1 remote wakeup\n");
			mod_timer(&hcd->rh_timer, fotg210->reset_done[0]);
		}
	}

	/* PCI errors [4.15.2.4] */
	if (unlikely((status & STS_FATAL) != 0)) {
		fotg210_err(fotg210, "fatal error\n");
		dbg_cmd(fotg210, "fatal", cmd);
		dbg_status(fotg210, "fatal", status);
dead:
		usb_hc_died(hcd);

		/* Don't let the controller do anything more */
		fotg210->shutdown = true;
		fotg210->rh_state = FOTG210_RH_STOPPING;
		fotg210->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
		fotg210_writel(fotg210, fotg210->command,
				&fotg210->regs->command);
		fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);
		fotg210_handle_controller_death(fotg210);

		/* Handle completions when the controller stops */
		bh = 0;
	}

	if (bh)
		fotg210_work(fotg210);
	spin_unlock(&fotg210->lock);
	if (pcd_status)
		usb_hcd_poll_rh_status(hcd);
	return IRQ_HANDLED;
}

/* non-error returns are a promise to giveback() the urb later
 * we drop ownership so next owner (or urb unlink) can get it
 *
 * urb + dev is in hcd.self.controller.urb_list
 * we're queueing TDs onto software and hardware lists
 *
 * hcd-specific init for hcpriv hasn't been done yet
 *
 * NOTE:  control, bulk, and interrupt share the same code to append TDs
 * to a (possibly active) QH, and the same QH scanning code.
 */
static int fotg210_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
		gfp_t mem_flags)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	struct list_head qtd_list;

	INIT_LIST_HEAD(&qtd_list);

	switch (usb_pipetype(urb->pipe)) {
	case PIPE_CONTROL:
		/* qh_completions() code doesn't handle all the fault cases
		 * in multi-TD control transfers.  Even 1KB is rare anyway.
		 */
		if (urb->transfer_buffer_length > (16 * 1024))
			return -EMSGSIZE;
		fallthrough;
	/* case PIPE_BULK: */
	default:
		if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags))
			return -ENOMEM;
		return submit_async(fotg210, urb, &qtd_list, mem_flags);

	case PIPE_INTERRUPT:
		if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags))
			return -ENOMEM;
		return intr_submit(fotg210, urb, &qtd_list, mem_flags);

	case PIPE_ISOCHRONOUS:
		return itd_submit(fotg210, urb, mem_flags);
	}
}

/* remove from hardware lists
 * completions normally happen asynchronously
 */

static int fotg210_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	struct fotg210_qh *qh;
	unsigned long flags;
	int rc;

	spin_lock_irqsave(&fotg210->lock, flags);
	rc = usb_hcd_check_unlink_urb(hcd, urb, status);
	if (rc)
		goto done;

	switch (usb_pipetype(urb->pipe)) {
	/* case PIPE_CONTROL: */
	/* case PIPE_BULK:*/
	default:
		qh = (struct fotg210_qh *) urb->hcpriv;
		if (!qh)
			break;
		switch (qh->qh_state) {
		case QH_STATE_LINKED:
		case QH_STATE_COMPLETING:
			start_unlink_async(fotg210, qh);
			break;
		case QH_STATE_UNLINK:
		case QH_STATE_UNLINK_WAIT:
			/* already started */
			break;
		case QH_STATE_IDLE:
			/* QH might be waiting for a Clear-TT-Buffer */
			qh_completions(fotg210, qh);
			break;
		}
		break;

	case PIPE_INTERRUPT:
		qh = (struct fotg210_qh *) urb->hcpriv;
		if (!qh)
			break;
		switch (qh->qh_state) {
		case QH_STATE_LINKED:
		case QH_STATE_COMPLETING:
			start_unlink_intr(fotg210, qh);
			break;
		case QH_STATE_IDLE:
			qh_completions(fotg210, qh);
			break;
		default:
			fotg210_dbg(fotg210, "bogus qh %p state %d\n",
					qh, qh->qh_state);
			goto done;
		}
		break;

	case PIPE_ISOCHRONOUS:
		/* itd... */

		/* wait till next completion, do it then. */
		/* completion irqs can wait up to 1024 msec, */
		break;
	}
done:
	spin_unlock_irqrestore(&fotg210->lock, flags);
	return rc;
}

/* bulk qh holds the data toggle */

static void fotg210_endpoint_disable(struct usb_hcd *hcd,
		struct usb_host_endpoint *ep)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	unsigned long flags;
	struct fotg210_qh *qh, *tmp;

	/* ASSERT:  any requests/urbs are being unlinked */
	/* ASSERT:  nobody can be submitting urbs for this any more */

rescan:
	spin_lock_irqsave(&fotg210->lock, flags);
	qh = ep->hcpriv;
	if (!qh)
		goto done;

	/* endpoints can be iso streams.  for now, we don't
	 * accelerate iso completions ... so spin a while.
	 */
	if (qh->hw == NULL) {
		struct fotg210_iso_stream *stream = ep->hcpriv;

		if (!list_empty(&stream->td_list))
			goto idle_timeout;

		/* BUG_ON(!list_empty(&stream->free_list)); */
		kfree(stream);
		goto done;
	}

	if (fotg210->rh_state < FOTG210_RH_RUNNING)
		qh->qh_state = QH_STATE_IDLE;
	switch (qh->qh_state) {
	case QH_STATE_LINKED:
	case QH_STATE_COMPLETING:
		for (tmp = fotg210->async->qh_next.qh;
				tmp && tmp != qh;
				tmp = tmp->qh_next.qh)
			continue;
		/* periodic qh self-unlinks on empty, and a COMPLETING qh
		 * may already be unlinked.
		 */
		if (tmp)
			start_unlink_async(fotg210, qh);
		fallthrough;
	case QH_STATE_UNLINK:		/* wait for hw to finish? */
	case QH_STATE_UNLINK_WAIT:
idle_timeout:
		spin_unlock_irqrestore(&fotg210->lock, flags);
		schedule_timeout_uninterruptible(1);
		goto rescan;
	case QH_STATE_IDLE:		/* fully unlinked */
		if (qh->clearing_tt)
			goto idle_timeout;
		if (list_empty(&qh->qtd_list)) {
			qh_destroy(fotg210, qh);
			break;
		}
		fallthrough;
	default:
		/* caller was supposed to have unlinked any requests;
		 * that's not our job.  just leak this memory.
		 */
		fotg210_err(fotg210, "qh %p (#%02x) state %d%s\n",
				qh, ep->desc.bEndpointAddress, qh->qh_state,
				list_empty(&qh->qtd_list) ? "" : "(has tds)");
		break;
	}
done:
	ep->hcpriv = NULL;
	spin_unlock_irqrestore(&fotg210->lock, flags);
}

static void fotg210_endpoint_reset(struct usb_hcd *hcd,
		struct usb_host_endpoint *ep)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
	struct fotg210_qh *qh;
	int eptype = usb_endpoint_type(&ep->desc);
	int epnum = usb_endpoint_num(&ep->desc);
	int is_out = usb_endpoint_dir_out(&ep->desc);
	unsigned long flags;

	if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
		return;

	spin_lock_irqsave(&fotg210->lock, flags);
	qh = ep->hcpriv;

	/* For Bulk and Interrupt endpoints we maintain the toggle state
	 * in the hardware; the toggle bits in udev aren't used at all.
	 * When an endpoint is reset by usb_clear_halt() we must reset
	 * the toggle bit in the QH.
	 */
	if (qh) {
		usb_settoggle(qh->dev, epnum, is_out, 0);
		if (!list_empty(&qh->qtd_list)) {
			WARN_ONCE(1, "clear_halt for a busy endpoint\n");
		} else if (qh->qh_state == QH_STATE_LINKED ||
				qh->qh_state == QH_STATE_COMPLETING) {

			/* The toggle value in the QH can't be updated
			 * while the QH is active.  Unlink it now;
			 * re-linking will call qh_refresh().
			 */
			if (eptype == USB_ENDPOINT_XFER_BULK)
				start_unlink_async(fotg210, qh);
			else
				start_unlink_intr(fotg210, qh);
		}
	}
	spin_unlock_irqrestore(&fotg210->lock, flags);
}

static int fotg210_get_frame(struct usb_hcd *hcd)
{
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);

	return (fotg210_read_frame_index(fotg210) >> 3) %
		fotg210->periodic_size;
}

/* The EHCI in ChipIdea HDRC cannot be a separate module or device,
 * because its registers (and irq) are shared between host/gadget/otg
 * functions  and in order to facilitate role switching we cannot
 * give the fotg210 driver exclusive access to those.
 */
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_LICENSE("GPL");

static const struct hc_driver fotg210_fotg210_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "Faraday USB2.0 Host Controller",
	.hcd_priv_size		= sizeof(struct fotg210_hcd),

	/*
	 * generic hardware linkage
	 */
	.irq			= fotg210_irq,
	.flags			= HCD_MEMORY | HCD_DMA | HCD_USB2,

	/*
	 * basic lifecycle operations
	 */
	.reset			= hcd_fotg210_init,
	.start			= fotg210_run,
	.stop			= fotg210_stop,
	.shutdown		= fotg210_shutdown,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue		= fotg210_urb_enqueue,
	.urb_dequeue		= fotg210_urb_dequeue,
	.endpoint_disable	= fotg210_endpoint_disable,
	.endpoint_reset		= fotg210_endpoint_reset,

	/*
	 * scheduling support
	 */
	.get_frame_number	= fotg210_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data	= fotg210_hub_status_data,
	.hub_control		= fotg210_hub_control,
	.bus_suspend		= fotg210_bus_suspend,
	.bus_resume		= fotg210_bus_resume,

	.relinquish_port	= fotg210_relinquish_port,
	.port_handed_over	= fotg210_port_handed_over,

	.clear_tt_buffer_complete = fotg210_clear_tt_buffer_complete,
};

static void fotg210_init(struct fotg210_hcd *fotg210)
{
	u32 value;

	iowrite32(GMIR_MDEV_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY,
			&fotg210->regs->gmir);

	value = ioread32(&fotg210->regs->otgcsr);
	value &= ~OTGCSR_A_BUS_DROP;
	value |= OTGCSR_A_BUS_REQ;
	iowrite32(value, &fotg210->regs->otgcsr);
}

/*
 * fotg210_hcd_probe - initialize faraday FOTG210 HCDs
 *
 * Allocates basic resources for this USB host controller, and
 * then invokes the start() method for the HCD associated with it
 * through the hotplug entry's driver_data.
 */
static int fotg210_hcd_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct usb_hcd *hcd;
	struct resource *res;
	int irq;
	int retval;
	struct fotg210_hcd *fotg210;

	if (usb_disabled())
		return -ENODEV;

	pdev->dev.power.power_state = PMSG_ON;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	hcd = usb_create_hcd(&fotg210_fotg210_hc_driver, dev,
			dev_name(dev));
	if (!hcd) {
		dev_err(dev, "failed to create hcd\n");
		retval = -ENOMEM;
		goto fail_create_hcd;
	}

	hcd->has_tt = 1;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(hcd->regs)) {
		retval = PTR_ERR(hcd->regs);
		goto failed_put_hcd;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	fotg210 = hcd_to_fotg210(hcd);

	fotg210->caps = hcd->regs;

	/* It's OK not to supply this clock */
	fotg210->pclk = clk_get(dev, "PCLK");
	if (!IS_ERR(fotg210->pclk)) {
		retval = clk_prepare_enable(fotg210->pclk);
		if (retval) {
			dev_err(dev, "failed to enable PCLK\n");
			goto failed_put_hcd;
		}
	} else if (PTR_ERR(fotg210->pclk) == -EPROBE_DEFER) {
		/*
		 * Percolate deferrals, for anything else,
		 * just live without the clocking.
		 */
		retval = PTR_ERR(fotg210->pclk);
		goto failed_dis_clk;
	}

	retval = fotg210_setup(hcd);
	if (retval)
		goto failed_dis_clk;

	fotg210_init(fotg210);

	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (retval) {
		dev_err(dev, "failed to add hcd with err %d\n", retval);
		goto failed_dis_clk;
	}
	device_wakeup_enable(hcd->self.controller);
	platform_set_drvdata(pdev, hcd);

	return retval;

failed_dis_clk:
	if (!IS_ERR(fotg210->pclk)) {
		clk_disable_unprepare(fotg210->pclk);
		clk_put(fotg210->pclk);
	}
failed_put_hcd:
	usb_put_hcd(hcd);
fail_create_hcd:
	dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval);
	return retval;
}

/*
 * fotg210_hcd_remove - shutdown processing for EHCI HCDs
 * @dev: USB Host Controller being removed
 *
 */
static int fotg210_hcd_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);

	if (!IS_ERR(fotg210->pclk)) {
		clk_disable_unprepare(fotg210->pclk);
		clk_put(fotg210->pclk);
	}

	usb_remove_hcd(hcd);
	usb_put_hcd(hcd);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id fotg210_of_match[] = {
	{ .compatible = "faraday,fotg210" },
	{},
};
MODULE_DEVICE_TABLE(of, fotg210_of_match);
#endif

static struct platform_driver fotg210_hcd_driver = {
	.driver = {
		.name   = "fotg210-hcd",
		.of_match_table = of_match_ptr(fotg210_of_match),
	},
	.probe  = fotg210_hcd_probe,
	.remove = fotg210_hcd_remove,
};

static int __init fotg210_hcd_init(void)
{
	int retval = 0;

	if (usb_disabled())
		return -ENODEV;

	set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
	if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
			test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
		pr_warn("Warning! fotg210_hcd should always be loaded before uhci_hcd and ohci_hcd, not after\n");

	pr_debug("%s: block sizes: qh %zd qtd %zd itd %zd\n",
			hcd_name, sizeof(struct fotg210_qh),
			sizeof(struct fotg210_qtd),
			sizeof(struct fotg210_itd));

	fotg210_debug_root = debugfs_create_dir("fotg210", usb_debug_root);

	retval = platform_driver_register(&fotg210_hcd_driver);
	if (retval < 0)
		goto clean;
	return retval;

clean:
	debugfs_remove(fotg210_debug_root);
	fotg210_debug_root = NULL;

	clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
	return retval;
}
module_init(fotg210_hcd_init);

static void __exit fotg210_hcd_cleanup(void)
{
	platform_driver_unregister(&fotg210_hcd_driver);
	debugfs_remove(fotg210_debug_root);
	clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
}
module_exit(fotg210_hcd_cleanup);