aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/gadget/omap_udc.c
blob: b66ea5a6ed791d6f0e8d2a05de7977da0aabe661 (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
/*
 * omap_udc.c -- for OMAP full speed udc; most chips support OTG.
 *
 * Copyright (C) 2004 Texas Instruments, Inc.
 * Copyright (C) 2004-2005 David Brownell
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#undef	DEBUG
#undef	VERBOSE

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/usb_ch9.h>
#include <linux/usb_gadget.h>
#include <linux/usb_otg.h>
#include <linux/dma-mapping.h>

#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/unaligned.h>
#include <asm/mach-types.h>

#include <asm/arch/dma.h>
#include <asm/arch/mux.h>
#include <asm/arch/usb.h>

#include "omap_udc.h"

#undef	USB_TRACE

/* bulk DMA seems to be behaving for both IN and OUT */
#define	USE_DMA

/* ISO too */
#define	USE_ISO

#define	DRIVER_DESC	"OMAP UDC driver"
#define	DRIVER_VERSION	"4 October 2004"

#define	DMA_ADDR_INVALID	(~(dma_addr_t)0)


/*
 * The OMAP UDC needs _very_ early endpoint setup:  before enabling the
 * D+ pullup to allow enumeration.  That's too early for the gadget
 * framework to use from usb_endpoint_enable(), which happens after
 * enumeration as part of activating an interface.  (But if we add an
 * optional new "UDC not yet running" state to the gadget driver model,
 * even just during driver binding, the endpoint autoconfig logic is the
 * natural spot to manufacture new endpoints.)
 *
 * So instead of using endpoint enable calls to control the hardware setup,
 * this driver defines a "fifo mode" parameter.  It's used during driver
 * initialization to choose among a set of pre-defined endpoint configs.
 * See omap_udc_setup() for available modes, or to add others.  That code
 * lives in an init section, so use this driver as a module if you need
 * to change the fifo mode after the kernel boots.
 *
 * Gadget drivers normally ignore endpoints they don't care about, and
 * won't include them in configuration descriptors.  That means only
 * misbehaving hosts would even notice they exist.
 */
#ifdef	USE_ISO
static unsigned fifo_mode = 3;
#else
static unsigned fifo_mode = 0;
#endif

/* "modprobe omap_udc fifo_mode=42", or else as a kernel
 * boot parameter "omap_udc:fifo_mode=42"
 */
module_param (fifo_mode, uint, 0);
MODULE_PARM_DESC (fifo_mode, "endpoint setup (0 == default)");

#ifdef	USE_DMA
static unsigned use_dma = 1;

/* "modprobe omap_udc use_dma=y", or else as a kernel
 * boot parameter "omap_udc:use_dma=y"
 */
module_param (use_dma, bool, 0);
MODULE_PARM_DESC (use_dma, "enable/disable DMA");
#else	/* !USE_DMA */

/* save a bit of code */
#define	use_dma		0
#endif	/* !USE_DMA */


static const char driver_name [] = "omap_udc";
static const char driver_desc [] = DRIVER_DESC;

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

/* there's a notion of "current endpoint" for modifying endpoint
 * state, and PIO access to its FIFO.  
 */

static void use_ep(struct omap_ep *ep, u16 select)
{
	u16	num = ep->bEndpointAddress & 0x0f;

	if (ep->bEndpointAddress & USB_DIR_IN)
		num |= UDC_EP_DIR;
	UDC_EP_NUM_REG = num | select;
	/* when select, MUST deselect later !! */
}

static inline void deselect_ep(void)
{
	UDC_EP_NUM_REG &= ~UDC_EP_SEL;
	/* 6 wait states before TX will happen */
}

static void dma_channel_claim(struct omap_ep *ep, unsigned preferred);

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

static int omap_ep_enable(struct usb_ep *_ep,
		const struct usb_endpoint_descriptor *desc)
{
	struct omap_ep	*ep = container_of(_ep, struct omap_ep, ep);
	struct omap_udc	*udc;
	unsigned long	flags;
	u16		maxp;

	/* catch various bogus parameters */
	if (!_ep || !desc || ep->desc
			|| desc->bDescriptorType != USB_DT_ENDPOINT
			|| ep->bEndpointAddress != desc->bEndpointAddress
			|| ep->maxpacket < le16_to_cpu
						(desc->wMaxPacketSize)) {
		DBG("%s, bad ep or descriptor\n", __FUNCTION__);
		return -EINVAL;
	}
	maxp = le16_to_cpu (desc->wMaxPacketSize);
	if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
				&& maxp != ep->maxpacket)
			|| desc->wMaxPacketSize > ep->maxpacket
			|| !desc->wMaxPacketSize) {
		DBG("%s, bad %s maxpacket\n", __FUNCTION__, _ep->name);
		return -ERANGE;
	}

#ifdef	USE_ISO
	if ((desc->bmAttributes == USB_ENDPOINT_XFER_ISOC
				&& desc->bInterval != 1)) {
		/* hardware wants period = 1; USB allows 2^(Interval-1) */
		DBG("%s, unsupported ISO period %dms\n", _ep->name,
				1 << (desc->bInterval - 1));
		return -EDOM;
	}
#else
	if (desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
		DBG("%s, ISO nyet\n", _ep->name);
		return -EDOM;
	}
#endif

	/* xfer types must match, except that interrupt ~= bulk */
	if (ep->bmAttributes != desc->bmAttributes
			&& ep->bmAttributes != USB_ENDPOINT_XFER_BULK
			&& desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
		DBG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
		return -EINVAL;
	}

	udc = ep->udc;
	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
		DBG("%s, bogus device state\n", __FUNCTION__);
		return -ESHUTDOWN;
	}

	spin_lock_irqsave(&udc->lock, flags);

	ep->desc = desc;
	ep->irqs = 0;
	ep->stopped = 0;
	ep->ep.maxpacket = maxp;

	/* set endpoint to initial state */
	ep->dma_channel = 0;
	ep->has_dma = 0;
	ep->lch = -1;
	use_ep(ep, UDC_EP_SEL);
	UDC_CTRL_REG = UDC_RESET_EP;
	ep->ackwait = 0;
	deselect_ep();

	if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
		list_add(&ep->iso, &udc->iso);

	/* maybe assign a DMA channel to this endpoint */
	if (use_dma && desc->bmAttributes == USB_ENDPOINT_XFER_BULK)
		/* FIXME ISO can dma, but prefers first channel */
		dma_channel_claim(ep, 0);

	/* PIO OUT may RX packets */
	if (desc->bmAttributes != USB_ENDPOINT_XFER_ISOC
			&& !ep->has_dma
			&& !(ep->bEndpointAddress & USB_DIR_IN)) {
		UDC_CTRL_REG = UDC_SET_FIFO_EN;
		ep->ackwait = 1 + ep->double_buf;
	}

	spin_unlock_irqrestore(&udc->lock, flags);
	VDBG("%s enabled\n", _ep->name);
	return 0;
}

static void nuke(struct omap_ep *, int status);

static int omap_ep_disable(struct usb_ep *_ep)
{
	struct omap_ep	*ep = container_of(_ep, struct omap_ep, ep);
	unsigned long	flags;

	if (!_ep || !ep->desc) {
		DBG("%s, %s not enabled\n", __FUNCTION__,
			_ep ? ep->ep.name : NULL);
		return -EINVAL;
	}

	spin_lock_irqsave(&ep->udc->lock, flags);
	ep->desc = 0;
	nuke (ep, -ESHUTDOWN);
	ep->ep.maxpacket = ep->maxpacket;
	ep->has_dma = 0;
	UDC_CTRL_REG = UDC_SET_HALT;
	list_del_init(&ep->iso);
	del_timer(&ep->timer);

	spin_unlock_irqrestore(&ep->udc->lock, flags);

	VDBG("%s disabled\n", _ep->name);
	return 0;
}

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

static struct usb_request *
omap_alloc_request(struct usb_ep *ep, int gfp_flags)
{
	struct omap_req	*req;

	req = kmalloc(sizeof *req, gfp_flags);
	if (req) {
		memset (req, 0, sizeof *req);
		req->req.dma = DMA_ADDR_INVALID;
		INIT_LIST_HEAD (&req->queue);
	}
	return &req->req;
}

static void
omap_free_request(struct usb_ep *ep, struct usb_request *_req)
{
	struct omap_req	*req = container_of(_req, struct omap_req, req);

	if (_req)
		kfree (req);
}

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

static void *
omap_alloc_buffer(
	struct usb_ep	*_ep,
	unsigned	bytes,
	dma_addr_t	*dma,
	int		gfp_flags
)
{
	void		*retval;
	struct omap_ep	*ep;

	ep = container_of(_ep, struct omap_ep, ep);
	if (use_dma && ep->has_dma) {
		static int	warned;
		if (!warned && bytes < PAGE_SIZE) {
			dev_warn(ep->udc->gadget.dev.parent,
				"using dma_alloc_coherent for "
				"small allocations wastes memory\n");
			warned++;
		}
		return dma_alloc_coherent(ep->udc->gadget.dev.parent,
				bytes, dma, gfp_flags);
	}

	retval = kmalloc(bytes, gfp_flags);
	if (retval)
		*dma = virt_to_phys(retval);
	return retval;
}

static void omap_free_buffer(
	struct usb_ep	*_ep,
	void		*buf,
	dma_addr_t	dma,
	unsigned	bytes
)
{
	struct omap_ep	*ep;

	ep = container_of(_ep, struct omap_ep, ep);
	if (use_dma && _ep && ep->has_dma)
		dma_free_coherent(ep->udc->gadget.dev.parent, bytes, buf, dma);
	else
		kfree (buf);
}

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

static void
done(struct omap_ep *ep, struct omap_req *req, int status)
{
	unsigned		stopped = ep->stopped;

	list_del_init(&req->queue);

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

	if (use_dma && ep->has_dma) {
		if (req->mapped) {
			dma_unmap_single(ep->udc->gadget.dev.parent,
				req->req.dma, req->req.length,
				(ep->bEndpointAddress & USB_DIR_IN)
					? DMA_TO_DEVICE
					: DMA_FROM_DEVICE);
			req->req.dma = DMA_ADDR_INVALID;
			req->mapped = 0;
		} else
			dma_sync_single_for_cpu(ep->udc->gadget.dev.parent,
				req->req.dma, req->req.length,
				(ep->bEndpointAddress & USB_DIR_IN)
					? DMA_TO_DEVICE
					: DMA_FROM_DEVICE);
	}

#ifndef	USB_TRACE
	if (status && status != -ESHUTDOWN)
#endif
		VDBG("complete %s req %p stat %d len %u/%u\n",
			ep->ep.name, &req->req, status,
			req->req.actual, req->req.length);

	/* don't modify queue heads during completion callback */
	ep->stopped = 1;
	spin_unlock(&ep->udc->lock);
	req->req.complete(&ep->ep, &req->req);
	spin_lock(&ep->udc->lock);
	ep->stopped = stopped;
}

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

#define	FIFO_FULL	(UDC_NON_ISO_FIFO_FULL | UDC_ISO_FIFO_FULL)
#define	FIFO_UNWRITABLE	(UDC_EP_HALTED | FIFO_FULL)

#define FIFO_EMPTY	(UDC_NON_ISO_FIFO_EMPTY | UDC_ISO_FIFO_EMPTY)
#define FIFO_UNREADABLE (UDC_EP_HALTED | FIFO_EMPTY)

static inline int 
write_packet(u8 *buf, struct omap_req *req, unsigned max)
{
	unsigned	len;
	u16		*wp;

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

	max = len;
	if (likely((((int)buf) & 1) == 0)) {
		wp = (u16 *)buf;
		while (max >= 2) {
			UDC_DATA_REG = *wp++;
			max -= 2;
		}
		buf = (u8 *)wp;
	}
	while (max--)
		*(volatile u8 *)&UDC_DATA_REG = *buf++;
	return len;
}

// FIXME change r/w fifo calling convention


// return:  0 = still running, 1 = completed, negative = errno
static int write_fifo(struct omap_ep *ep, struct omap_req *req)
{
	u8		*buf;
	unsigned	count;
	int		is_last;
	u16		ep_stat;

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

	/* PIO-IN isn't double buffered except for iso */
	ep_stat = UDC_STAT_FLG_REG;
	if (ep_stat & FIFO_UNWRITABLE)
		return 0;

	count = ep->ep.maxpacket;
	count = write_packet(buf, req, count);
	UDC_CTRL_REG = UDC_SET_FIFO_EN;
	ep->ackwait = 1;

	/* last packet is often short (sometimes a zlp) */
	if (count != ep->ep.maxpacket)
		is_last = 1;
	else if (req->req.length == req->req.actual
			&& !req->req.zero)
		is_last = 1;
	else
		is_last = 0;

	/* NOTE:  requests complete when all IN data is in a
	 * FIFO (or sometimes later, if a zlp was needed).
	 * Use usb_ep_fifo_status() where needed.
	 */
	if (is_last)
		done(ep, req, 0);
	return is_last;
}

static inline int 
read_packet(u8 *buf, struct omap_req *req, unsigned avail)
{
	unsigned	len;
	u16		*wp;

	len = min(req->req.length - req->req.actual, avail);
	req->req.actual += len;
	avail = len;

	if (likely((((int)buf) & 1) == 0)) {
		wp = (u16 *)buf;
		while (avail >= 2) {
			*wp++ = UDC_DATA_REG;
			avail -= 2;
		}
		buf = (u8 *)wp;
	}
	while (avail--)
		*buf++ = *(volatile u8 *)&UDC_DATA_REG;
	return len;
}

// return:  0 = still running, 1 = queue empty, negative = errno
static int read_fifo(struct omap_ep *ep, struct omap_req *req)
{
	u8		*buf;
	unsigned	count, avail;
	int		is_last;

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

	for (;;) {
		u16	ep_stat = UDC_STAT_FLG_REG;

		is_last = 0;
		if (ep_stat & FIFO_EMPTY) {
			if (!ep->double_buf)
				break;
			ep->fnf = 1;
		}
		if (ep_stat & UDC_EP_HALTED)
			break;

		if (ep_stat & FIFO_FULL)
			avail = ep->ep.maxpacket;
		else  {
			avail = UDC_RXFSTAT_REG;
			ep->fnf = ep->double_buf;
		}
		count = read_packet(buf, req, avail);

		/* partial packet reads may not be errors */
		if (count < ep->ep.maxpacket) {
			is_last = 1;
			/* overflowed this request?  flush extra data */
			if (count != avail) {
				req->req.status = -EOVERFLOW;
				avail -= count;
				while (avail--)
					(void) *(volatile u8 *)&UDC_DATA_REG;
			}
		} else if (req->req.length == req->req.actual)
			is_last = 1;
		else
			is_last = 0;

		if (!ep->bEndpointAddress)
			break;
		if (is_last)
			done(ep, req, 0);
		break;
	}
	return is_last;
}

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

static u16 dma_src_len(struct omap_ep *ep, dma_addr_t start)
{
	dma_addr_t	end;

	/* IN-DMA needs this on fault/cancel paths, so 15xx misreports
	 * the last transfer's bytecount by more than a FIFO's worth.
	 */
	if (cpu_is_omap15xx())
		return 0;

	end = omap_readw(OMAP_DMA_CSAC(ep->lch));
	if (end == ep->dma_counter)
		return 0;

	end |= start & (0xffff << 16);
	if (end < start)
		end += 0x10000;
	return end - start;
}

#define DMA_DEST_LAST(x) (cpu_is_omap15xx() \
		? OMAP_DMA_CSAC(x) /* really: CPC */ \
		: OMAP_DMA_CDAC(x))

static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start)
{
	dma_addr_t	end;

	end = omap_readw(DMA_DEST_LAST(ep->lch));
	if (end == ep->dma_counter)
		return 0;

	end |= start & (0xffff << 16);
	if (cpu_is_omap15xx())
		end++;
	if (end < start)
		end += 0x10000;
	return end - start;
}


/* Each USB transfer request using DMA maps to one or more DMA transfers.
 * When DMA completion isn't request completion, the UDC continues with
 * the next DMA transfer for that USB transfer.
 */

static void next_in_dma(struct omap_ep *ep, struct omap_req *req)
{
	u16		txdma_ctrl;
	unsigned	length = req->req.length - req->req.actual;
	const int	sync_mode = cpu_is_omap15xx()
				? OMAP_DMA_SYNC_FRAME
				: OMAP_DMA_SYNC_ELEMENT;

	/* measure length in either bytes or packets */
	if ((cpu_is_omap16xx() && length <= (UDC_TXN_TSC + 1))
			|| (cpu_is_omap15xx() && length < ep->maxpacket)) {
		txdma_ctrl = UDC_TXN_EOT | length;
		omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
				length, 1, sync_mode);
	} else {
		length = min(length / ep->maxpacket,
				(unsigned) UDC_TXN_TSC + 1);
 		txdma_ctrl = length;
		omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
				ep->ep.maxpacket, length, sync_mode);
		length *= ep->maxpacket;
	}
	omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF,
		OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual);

	omap_start_dma(ep->lch);
	ep->dma_counter = omap_readw(OMAP_DMA_CSAC(ep->lch));
	UDC_DMA_IRQ_EN_REG |= UDC_TX_DONE_IE(ep->dma_channel);
	UDC_TXDMA_REG(ep->dma_channel) = UDC_TXN_START | txdma_ctrl;
	req->dma_bytes = length;
}

static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status)
{
	if (status == 0) {
		req->req.actual += req->dma_bytes;

		/* return if this request needs to send data or zlp */
		if (req->req.actual < req->req.length)
			return;
		if (req->req.zero
				&& req->dma_bytes != 0
				&& (req->req.actual % ep->maxpacket) == 0)
			return;
	} else
		req->req.actual += dma_src_len(ep, req->req.dma
							+ req->req.actual);

	/* tx completion */
	omap_stop_dma(ep->lch);
	UDC_DMA_IRQ_EN_REG &= ~UDC_TX_DONE_IE(ep->dma_channel);
	done(ep, req, status);
}

static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
{
	unsigned packets;

	/* NOTE:  we filtered out "short reads" before, so we know
	 * the buffer has only whole numbers of packets.
	 */

	/* set up this DMA transfer, enable the fifo, start */
	packets = (req->req.length - req->req.actual) / ep->ep.maxpacket;
	packets = min(packets, (unsigned)UDC_RXN_TC + 1);
	req->dma_bytes = packets * ep->ep.maxpacket;
	omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
			ep->ep.maxpacket, packets,
			OMAP_DMA_SYNC_ELEMENT);
	omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF,
		OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual);
	ep->dma_counter = omap_readw(DMA_DEST_LAST(ep->lch));

	UDC_RXDMA_REG(ep->dma_channel) = UDC_RXN_STOP | (packets - 1);
	UDC_DMA_IRQ_EN_REG |= UDC_RX_EOT_IE(ep->dma_channel);
	UDC_EP_NUM_REG = (ep->bEndpointAddress & 0xf);
	UDC_CTRL_REG = UDC_SET_FIFO_EN;

	omap_start_dma(ep->lch);
}

static void
finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status)
{
	u16	count;

	if (status == 0)
		ep->dma_counter = (u16) (req->req.dma + req->req.actual);
	count = dma_dest_len(ep, req->req.dma + req->req.actual);
	count += req->req.actual;
	if (count <= req->req.length)
		req->req.actual = count;

	if (count != req->dma_bytes || status)
		omap_stop_dma(ep->lch);

	/* if this wasn't short, request may need another transfer */
	else if (req->req.actual < req->req.length)
		return;

	/* rx completion */
	UDC_DMA_IRQ_EN_REG &= ~UDC_RX_EOT_IE(ep->dma_channel);
	done(ep, req, status);
}

static void dma_irq(struct omap_udc *udc, u16 irq_src)
{
	u16		dman_stat = UDC_DMAN_STAT_REG;
	struct omap_ep	*ep;
	struct omap_req	*req;

	/* IN dma: tx to host */
	if (irq_src & UDC_TXN_DONE) {
		ep = &udc->ep[16 + UDC_DMA_TX_SRC(dman_stat)];
		ep->irqs++;
		/* can see TXN_DONE after dma abort */
		if (!list_empty(&ep->queue)) {
			req = container_of(ep->queue.next,
						struct omap_req, queue);
			finish_in_dma(ep, req, 0);
		}
		UDC_IRQ_SRC_REG = UDC_TXN_DONE;

		if (!list_empty (&ep->queue)) {
			req = container_of(ep->queue.next,
					struct omap_req, queue);
			next_in_dma(ep, req);
		}
	}

	/* OUT dma: rx from host */
	if (irq_src & UDC_RXN_EOT) {
		ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
		ep->irqs++;
		/* can see RXN_EOT after dma abort */
		if (!list_empty(&ep->queue)) {
			req = container_of(ep->queue.next,
					struct omap_req, queue);
			finish_out_dma(ep, req, 0);
		}
		UDC_IRQ_SRC_REG = UDC_RXN_EOT;

		if (!list_empty (&ep->queue)) {
			req = container_of(ep->queue.next,
					struct omap_req, queue);
			next_out_dma(ep, req);
		}
	}

	if (irq_src & UDC_RXN_CNT) {
		ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
		ep->irqs++;
		/* omap15xx does this unasked... */
		VDBG("%s, RX_CNT irq?\n", ep->ep.name);
		UDC_IRQ_SRC_REG = UDC_RXN_CNT;
	}
}

static void dma_error(int lch, u16 ch_status, void *data)
{
	struct omap_ep	*ep = data;

	/* if ch_status & OMAP_DMA_DROP_IRQ ... */
	/* if ch_status & OMAP_DMA_TOUT_IRQ ... */
	ERR("%s dma error, lch %d status %02x\n", ep->ep.name, lch, ch_status);

	/* complete current transfer ... */
}

static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
{
	u16	reg;
	int	status, restart, is_in;

	is_in = ep->bEndpointAddress & USB_DIR_IN;
	if (is_in)
		reg = UDC_TXDMA_CFG_REG;
	else
		reg = UDC_RXDMA_CFG_REG;
	reg |= 1 << 12;		/* "pulse" activated */

	ep->dma_channel = 0;
	ep->lch = -1;
	if (channel == 0 || channel > 3) {
		if ((reg & 0x0f00) == 0)
			channel = 3;
		else if ((reg & 0x00f0) == 0)
			channel = 2;
		else if ((reg & 0x000f) == 0)	/* preferred for ISO */
			channel = 1;
		else {
			status = -EMLINK;
			goto just_restart;
		}
	}
	reg |= (0x0f & ep->bEndpointAddress) << (4 * (channel - 1));
	ep->dma_channel = channel;

	if (is_in) {
		status = omap_request_dma(OMAP_DMA_USB_W2FC_TX0 - 1 + channel,
			ep->ep.name, dma_error, ep, &ep->lch);
		if (status == 0) {
			UDC_TXDMA_CFG_REG = reg;
			omap_set_dma_dest_params(ep->lch,
				OMAP_DMA_PORT_TIPB,
				OMAP_DMA_AMODE_CONSTANT,
				(unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG));
		}
	} else {
		status = omap_request_dma(OMAP_DMA_USB_W2FC_RX0 - 1 + channel,
			ep->ep.name, dma_error, ep, &ep->lch);
		if (status == 0) {
			UDC_RXDMA_CFG_REG = reg;
			omap_set_dma_src_params(ep->lch,
				OMAP_DMA_PORT_TIPB,
				OMAP_DMA_AMODE_CONSTANT,
				(unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG));
		}
	}
	if (status)
		ep->dma_channel = 0;
	else {
		ep->has_dma = 1;
		omap_disable_dma_irq(ep->lch, OMAP_DMA_BLOCK_IRQ);

		/* channel type P: hw synch (fifo) */
		if (!cpu_is_omap15xx())
			omap_writew(2, OMAP_DMA_LCH_CTRL(ep->lch));
	}

just_restart:
	/* restart any queue, even if the claim failed  */
	restart = !ep->stopped && !list_empty(&ep->queue);

	if (status)
		DBG("%s no dma channel: %d%s\n", ep->ep.name, status,
			restart ? " (restart)" : "");
	else
		DBG("%s claimed %cxdma%d lch %d%s\n", ep->ep.name,
			is_in ? 't' : 'r',
			ep->dma_channel - 1, ep->lch,
			restart ? " (restart)" : "");

	if (restart) {
		struct omap_req	*req;
		req = container_of(ep->queue.next, struct omap_req, queue);
		if (ep->has_dma)
			(is_in ? next_in_dma : next_out_dma)(ep, req);
		else {
			use_ep(ep, UDC_EP_SEL);
			(is_in ? write_fifo : read_fifo)(ep, req);
			deselect_ep();
			if (!is_in) {
				UDC_CTRL_REG = UDC_SET_FIFO_EN;
				ep->ackwait = 1 + ep->double_buf;
			}
			/* IN: 6 wait states before it'll tx */
		}
	}
}

static void dma_channel_release(struct omap_ep *ep)
{
	int		shift = 4 * (ep->dma_channel - 1);
	u16		mask = 0x0f << shift;
	struct omap_req	*req;
	int		active;

	/* abort any active usb transfer request */
	if (!list_empty(&ep->queue))
		req = container_of(ep->queue.next, struct omap_req, queue);
	else
		req = 0;

	active = ((1 << 7) & omap_readl(OMAP_DMA_CCR(ep->lch))) != 0;

	DBG("%s release %s %cxdma%d %p\n", ep->ep.name,
			active ? "active" : "idle",
			(ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
			ep->dma_channel - 1, req);

	/* wait till current packet DMA finishes, and fifo empties */
	if (ep->bEndpointAddress & USB_DIR_IN) {
		UDC_TXDMA_CFG_REG &= ~mask;

		if (req) {
			finish_in_dma(ep, req, -ECONNRESET);

			/* clear FIFO; hosts probably won't empty it */
			use_ep(ep, UDC_EP_SEL);
			UDC_CTRL_REG = UDC_CLR_EP;
			deselect_ep();
		}
		while (UDC_TXDMA_CFG_REG & mask)
			udelay(10);
	} else {
		UDC_RXDMA_CFG_REG &= ~mask;

		/* dma empties the fifo */
		while (UDC_RXDMA_CFG_REG & mask)
			udelay(10);
		if (req)
			finish_out_dma(ep, req, -ECONNRESET);
	}
	omap_free_dma(ep->lch);
	ep->dma_channel = 0;
	ep->lch = -1;
	/* has_dma still set, till endpoint is fully quiesced */
}


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

static int
omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, int gfp_flags)
{
	struct omap_ep	*ep = container_of(_ep, struct omap_ep, ep);
	struct omap_req	*req = container_of(_req, struct omap_req, req);
	struct omap_udc	*udc;
	unsigned long	flags;
	int		is_iso = 0;

	/* catch various bogus parameters */
	if (!_req || !req->req.complete || !req->req.buf
			|| !list_empty(&req->queue)) {
		DBG("%s, bad params\n", __FUNCTION__);
		return -EINVAL;
	}
	if (!_ep || (!ep->desc && ep->bEndpointAddress)) {
		DBG("%s, bad ep\n", __FUNCTION__);
		return -EINVAL;
	}
	if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
		if (req->req.length > ep->ep.maxpacket)
			return -EMSGSIZE;
		is_iso = 1;
	}

	/* this isn't bogus, but OMAP DMA isn't the only hardware to
	 * have a hard time with partial packet reads...  reject it.
	 */
	if (use_dma
			&& ep->has_dma
			&& ep->bEndpointAddress != 0
			&& (ep->bEndpointAddress & USB_DIR_IN) == 0
			&& (req->req.length % ep->ep.maxpacket) != 0) {
		DBG("%s, no partial packet OUT reads\n", __FUNCTION__);
		return -EMSGSIZE;
	}

	udc = ep->udc;
	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
		return -ESHUTDOWN;

	if (use_dma && ep->has_dma) {
		if (req->req.dma == DMA_ADDR_INVALID) {
			req->req.dma = dma_map_single(
				ep->udc->gadget.dev.parent,
				req->req.buf,
				req->req.length,
				(ep->bEndpointAddress & USB_DIR_IN)
					? DMA_TO_DEVICE
					: DMA_FROM_DEVICE);
			req->mapped = 1;
		} else {
			dma_sync_single_for_device(
				ep->udc->gadget.dev.parent,
				req->req.dma, req->req.length,
				(ep->bEndpointAddress & USB_DIR_IN)
					? DMA_TO_DEVICE
					: DMA_FROM_DEVICE);
			req->mapped = 0;
		}
	}

	VDBG("%s queue req %p, len %d buf %p\n",
		ep->ep.name, _req, _req->length, _req->buf);

	spin_lock_irqsave(&udc->lock, flags);

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

	/* maybe kickstart non-iso i/o queues */
	if (is_iso)
		UDC_IRQ_EN_REG |= UDC_SOF_IE;
	else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) {
		int	is_in;

		if (ep->bEndpointAddress == 0) {
			if (!udc->ep0_pending || !list_empty (&ep->queue)) {
				spin_unlock_irqrestore(&udc->lock, flags);
				return -EL2HLT;
			}

			/* empty DATA stage? */
			is_in = udc->ep0_in;
			if (!req->req.length) {

				/* chip became CONFIGURED or ADDRESSED
				 * earlier; drivers may already have queued
				 * requests to non-control endpoints
				 */
				if (udc->ep0_set_config) {
					u16	irq_en = UDC_IRQ_EN_REG;

					irq_en |= UDC_DS_CHG_IE | UDC_EP0_IE;
					if (!udc->ep0_reset_config)
						irq_en |= UDC_EPN_RX_IE
							| UDC_EPN_TX_IE;
					UDC_IRQ_EN_REG = irq_en;
				}

				/* STATUS is reverse direction */
				UDC_EP_NUM_REG = is_in
						? UDC_EP_SEL
						: (UDC_EP_SEL|UDC_EP_DIR);
				UDC_CTRL_REG = UDC_CLR_EP;
				UDC_CTRL_REG = UDC_SET_FIFO_EN;
				UDC_EP_NUM_REG = udc->ep0_in ? 0 : UDC_EP_DIR;

				/* cleanup */
				udc->ep0_pending = 0;
				done(ep, req, 0);
				req = 0;

			/* non-empty DATA stage */
			} else if (is_in) {
				UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
			} else {
				if (udc->ep0_setup)
					goto irq_wait;
				UDC_EP_NUM_REG = UDC_EP_SEL;
			}
		} else {
			is_in = ep->bEndpointAddress & USB_DIR_IN;
			if (!ep->has_dma)
				use_ep(ep, UDC_EP_SEL);
			/* if ISO: SOF IRQs must be enabled/disabled! */
		}

		if (ep->has_dma)
			(is_in ? next_in_dma : next_out_dma)(ep, req);
		else if (req) {
			if ((is_in ? write_fifo : read_fifo)(ep, req) == 1)
				req = 0;
			deselect_ep();
			if (!is_in) {
				UDC_CTRL_REG = UDC_SET_FIFO_EN;
				ep->ackwait = 1 + ep->double_buf;
			}
			/* IN: 6 wait states before it'll tx */
		}
	}

irq_wait:
	/* irq handler advances the queue */
	if (req != 0)
		list_add_tail(&req->queue, &ep->queue);
	spin_unlock_irqrestore(&udc->lock, flags);

	return 0;
}

static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
	struct omap_ep	*ep = container_of(_ep, struct omap_ep, ep);
	struct omap_req	*req;
	unsigned long	flags;

	if (!_ep || !_req)
		return -EINVAL;

	spin_lock_irqsave(&ep->udc->lock, flags);

	/* make sure it's actually queued on this endpoint */
	list_for_each_entry (req, &ep->queue, queue) {
		if (&req->req == _req)
			break;
	}
	if (&req->req != _req) {
		spin_unlock_irqrestore(&ep->udc->lock, flags);
		return -EINVAL;
	}

	if (use_dma && ep->dma_channel && ep->queue.next == &req->queue) {
		int channel = ep->dma_channel;

		/* releasing the channel cancels the request,
		 * reclaiming the channel restarts the queue
		 */
		dma_channel_release(ep);
		dma_channel_claim(ep, channel);
	} else 
		done(ep, req, -ECONNRESET);
	spin_unlock_irqrestore(&ep->udc->lock, flags);
	return 0;
}

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

static int omap_ep_set_halt(struct usb_ep *_ep, int value)
{
	struct omap_ep	*ep = container_of(_ep, struct omap_ep, ep);
	unsigned long	flags;
	int		status = -EOPNOTSUPP;

	spin_lock_irqsave(&ep->udc->lock, flags);

	/* just use protocol stalls for ep0; real halts are annoying */
	if (ep->bEndpointAddress == 0) {
		if (!ep->udc->ep0_pending)
			status = -EINVAL;
		else if (value) {
			if (ep->udc->ep0_set_config) {
				WARN("error changing config?\n");
				UDC_SYSCON2_REG = UDC_CLR_CFG;
			}
			UDC_SYSCON2_REG = UDC_STALL_CMD;
			ep->udc->ep0_pending = 0;
			status = 0;
		} else /* NOP */
			status = 0;

	/* otherwise, all active non-ISO endpoints can halt */
	} else if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC && ep->desc) {

		/* IN endpoints must already be idle */
		if ((ep->bEndpointAddress & USB_DIR_IN)
				&& !list_empty(&ep->queue)) { 
			status = -EAGAIN;
			goto done;
		}

		if (value) {
			int	channel;

			if (use_dma && ep->dma_channel
					&& !list_empty(&ep->queue)) {
				channel = ep->dma_channel;
				dma_channel_release(ep);
			} else
				channel = 0;

			use_ep(ep, UDC_EP_SEL);
			if (UDC_STAT_FLG_REG & UDC_NON_ISO_FIFO_EMPTY) {
				UDC_CTRL_REG = UDC_SET_HALT;
				status = 0;
			} else
				status = -EAGAIN;
			deselect_ep();

			if (channel)
				dma_channel_claim(ep, channel);
		} else {
			use_ep(ep, 0);
			UDC_CTRL_REG = UDC_RESET_EP;
			ep->ackwait = 0;
			if (!(ep->bEndpointAddress & USB_DIR_IN)) {
				UDC_CTRL_REG = UDC_SET_FIFO_EN;
				ep->ackwait = 1 + ep->double_buf;
			}
		}
	}
done:
	VDBG("%s %s halt stat %d\n", ep->ep.name,
		value ? "set" : "clear", status);

	spin_unlock_irqrestore(&ep->udc->lock, flags);
	return status;
}

static struct usb_ep_ops omap_ep_ops = {
	.enable		= omap_ep_enable,
	.disable	= omap_ep_disable,

	.alloc_request	= omap_alloc_request,
	.free_request	= omap_free_request,

	.alloc_buffer	= omap_alloc_buffer,
	.free_buffer	= omap_free_buffer,

	.queue		= omap_ep_queue,
	.dequeue	= omap_ep_dequeue,

	.set_halt	= omap_ep_set_halt,
	// fifo_status ... report bytes in fifo
	// fifo_flush ... flush fifo
};

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

static int omap_get_frame(struct usb_gadget *gadget)
{
	u16	sof = UDC_SOF_REG;
	return (sof & UDC_TS_OK) ? (sof & UDC_TS) : -EL2NSYNC;
}

static int omap_wakeup(struct usb_gadget *gadget)
{
	struct omap_udc	*udc;
	unsigned long	flags;
	int		retval = -EHOSTUNREACH;

	udc = container_of(gadget, struct omap_udc, gadget);

	spin_lock_irqsave(&udc->lock, flags);
	if (udc->devstat & UDC_SUS) {
		/* NOTE:  OTG spec erratum says that OTG devices may
		 * issue wakeups without host enable.
		 */
		if (udc->devstat & (UDC_B_HNP_ENABLE|UDC_R_WK_OK)) {
			DBG("remote wakeup...\n");
			UDC_SYSCON2_REG = UDC_RMT_WKP;
			retval = 0;
		}

	/* NOTE:  non-OTG systems may use SRP TOO... */
	} else if (!(udc->devstat & UDC_ATT)) {
		if (udc->transceiver)
			retval = otg_start_srp(udc->transceiver);
	}
	spin_unlock_irqrestore(&udc->lock, flags);

	return retval;
}

static int
omap_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
{
	struct omap_udc	*udc;
	unsigned long	flags;
	u16		syscon1;

	udc = container_of(gadget, struct omap_udc, gadget);
	spin_lock_irqsave(&udc->lock, flags);
	syscon1 = UDC_SYSCON1_REG;
	if (is_selfpowered)
		syscon1 |= UDC_SELF_PWR;
	else
		syscon1 &= ~UDC_SELF_PWR;
	UDC_SYSCON1_REG = syscon1;
	spin_unlock_irqrestore(&udc->lock, flags);

	return 0;
}

static int can_pullup(struct omap_udc *udc)
{
	return udc->driver && udc->softconnect && udc->vbus_active;
}

static void pullup_enable(struct omap_udc *udc)
{
	UDC_SYSCON1_REG |= UDC_PULLUP_EN;
#ifndef CONFIG_USB_OTG
	if (!cpu_is_omap15xx())
		OTG_CTRL_REG |= OTG_BSESSVLD;
#endif
	UDC_IRQ_EN_REG = UDC_DS_CHG_IE;
}

static void pullup_disable(struct omap_udc *udc)
{
#ifndef CONFIG_USB_OTG
	if (!cpu_is_omap15xx())
		OTG_CTRL_REG &= ~OTG_BSESSVLD;
#endif
	UDC_IRQ_EN_REG = UDC_DS_CHG_IE;
	UDC_SYSCON1_REG &= ~UDC_PULLUP_EN;
}

/*
 * Called by whatever detects VBUS sessions:  external transceiver
 * driver, or maybe GPIO0 VBUS IRQ.  May request 48 MHz clock.
 */
static int omap_vbus_session(struct usb_gadget *gadget, int is_active)
{
	struct omap_udc	*udc;
	unsigned long	flags;

	udc = container_of(gadget, struct omap_udc, gadget);
	spin_lock_irqsave(&udc->lock, flags);
	VDBG("VBUS %s\n", is_active ? "on" : "off");
	udc->vbus_active = (is_active != 0);
	if (cpu_is_omap15xx()) {
		/* "software" detect, ignored if !VBUS_MODE_1510 */
		if (is_active)
			FUNC_MUX_CTRL_0_REG |= VBUS_CTRL_1510;
		else
			FUNC_MUX_CTRL_0_REG &= ~VBUS_CTRL_1510;
	}
	if (can_pullup(udc))
		pullup_enable(udc);
	else
		pullup_disable(udc);
	spin_unlock_irqrestore(&udc->lock, flags);
	return 0;
}

static int omap_vbus_draw(struct usb_gadget *gadget, unsigned mA)
{
	struct omap_udc	*udc;

	udc = container_of(gadget, struct omap_udc, gadget);
	if (udc->transceiver)
		return otg_set_power(udc->transceiver, mA);
	return -EOPNOTSUPP;
}

static int omap_pullup(struct usb_gadget *gadget, int is_on)
{
	struct omap_udc	*udc;
	unsigned long	flags;

	udc = container_of(gadget, struct omap_udc, gadget);
	spin_lock_irqsave(&udc->lock, flags);
	udc->softconnect = (is_on != 0);
	if (can_pullup(udc))
		pullup_enable(udc);
	else
		pullup_disable(udc);
	spin_unlock_irqrestore(&udc->lock, flags);
	return 0;
}

static struct usb_gadget_ops omap_gadget_ops = {
	.get_frame		= omap_get_frame,
	.wakeup			= omap_wakeup,
	.set_selfpowered	= omap_set_selfpowered,
	.vbus_session		= omap_vbus_session,
	.vbus_draw		= omap_vbus_draw,
	.pullup			= omap_pullup,
};

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

/* dequeue ALL requests; caller holds udc->lock */
static void nuke(struct omap_ep *ep, int status)
{
	struct omap_req	*req;

	ep->stopped = 1;

	if (use_dma && ep->dma_channel)
		dma_channel_release(ep);

	use_ep(ep, 0);
	UDC_CTRL_REG = UDC_CLR_EP;
	if (ep->bEndpointAddress && ep->bmAttributes != USB_ENDPOINT_XFER_ISOC)
		UDC_CTRL_REG = UDC_SET_HALT;

	while (!list_empty(&ep->queue)) {
		req = list_entry(ep->queue.next, struct omap_req, queue);
		done(ep, req, status);
	}
}

/* caller holds udc->lock */
static void udc_quiesce(struct omap_udc *udc)
{
	struct omap_ep	*ep;

	udc->gadget.speed = USB_SPEED_UNKNOWN;
	nuke(&udc->ep[0], -ESHUTDOWN);
	list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list)
		nuke(ep, -ESHUTDOWN);
}

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

static void update_otg(struct omap_udc *udc)
{
	u16	devstat;

	if (!udc->gadget.is_otg)
		return;

	if (OTG_CTRL_REG & OTG_ID)
		devstat = UDC_DEVSTAT_REG;
	else
		devstat = 0;

	udc->gadget.b_hnp_enable = !!(devstat & UDC_B_HNP_ENABLE);
	udc->gadget.a_hnp_support = !!(devstat & UDC_A_HNP_SUPPORT);
	udc->gadget.a_alt_hnp_support = !!(devstat & UDC_A_ALT_HNP_SUPPORT);

	/* Enable HNP early, avoiding races on suspend irq path.
	 * ASSUMES OTG state machine B_BUS_REQ input is true.
	 */
	if (udc->gadget.b_hnp_enable)
		OTG_CTRL_REG = (OTG_CTRL_REG | OTG_B_HNPEN | OTG_B_BUSREQ)
				& ~OTG_PULLUP;
}

static void ep0_irq(struct omap_udc *udc, u16 irq_src)
{
	struct omap_ep	*ep0 = &udc->ep[0];
	struct omap_req	*req = 0;

	ep0->irqs++;

	/* Clear any pending requests and then scrub any rx/tx state
	 * before starting to handle the SETUP request.
	 */
	if (irq_src & UDC_SETUP) {
		u16	ack = irq_src & (UDC_EP0_TX|UDC_EP0_RX);

		nuke(ep0, 0);
		if (ack) {
			UDC_IRQ_SRC_REG = ack;
			irq_src = UDC_SETUP;
		}
	}

	/* IN/OUT packets mean we're in the DATA or STATUS stage.  
	 * This driver uses only uses protocol stalls (ep0 never halts),
	 * and if we got this far the gadget driver already had a
	 * chance to stall.  Tries to be forgiving of host oddities.
	 *
	 * NOTE:  the last chance gadget drivers have to stall control
	 * requests is during their request completion callback.
	 */
	if (!list_empty(&ep0->queue))
		req = container_of(ep0->queue.next, struct omap_req, queue);

	/* IN == TX to host */
	if (irq_src & UDC_EP0_TX) {
		int	stat;

		UDC_IRQ_SRC_REG = UDC_EP0_TX;
		UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
		stat = UDC_STAT_FLG_REG;
		if (stat & UDC_ACK) {
			if (udc->ep0_in) {
				/* write next IN packet from response,
				 * or set up the status stage.
				 */
				if (req)
					stat = write_fifo(ep0, req);
				UDC_EP_NUM_REG = UDC_EP_DIR;
				if (!req && udc->ep0_pending) {
					UDC_EP_NUM_REG = UDC_EP_SEL;
					UDC_CTRL_REG = UDC_CLR_EP;
					UDC_CTRL_REG = UDC_SET_FIFO_EN;
					UDC_EP_NUM_REG = 0;
					udc->ep0_pending = 0;
				} /* else:  6 wait states before it'll tx */
			} else {
				/* ack status stage of OUT transfer */
				UDC_EP_NUM_REG = UDC_EP_DIR;
				if (req)
					done(ep0, req, 0);
			}
			req = 0;
		} else if (stat & UDC_STALL) {
			UDC_CTRL_REG = UDC_CLR_HALT;
			UDC_EP_NUM_REG = UDC_EP_DIR;
		} else {
			UDC_EP_NUM_REG = UDC_EP_DIR;
		}
	}

	/* OUT == RX from host */
	if (irq_src & UDC_EP0_RX) {
		int	stat;

		UDC_IRQ_SRC_REG = UDC_EP0_RX;
		UDC_EP_NUM_REG = UDC_EP_SEL;
		stat = UDC_STAT_FLG_REG;
		if (stat & UDC_ACK) {
			if (!udc->ep0_in) {
				stat = 0;
				/* read next OUT packet of request, maybe
				 * reactiviting the fifo; stall on errors.
				 */
				if (!req || (stat = read_fifo(ep0, req)) < 0) {
					UDC_SYSCON2_REG = UDC_STALL_CMD;
					udc->ep0_pending = 0;
					stat = 0;
				} else if (stat == 0)
					UDC_CTRL_REG = UDC_SET_FIFO_EN;
				UDC_EP_NUM_REG = 0;
				
				/* activate status stage */
				if (stat == 1) {
					done(ep0, req, 0);
					/* that may have STALLed ep0... */
					UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
					UDC_CTRL_REG = UDC_CLR_EP;
					UDC_CTRL_REG = UDC_SET_FIFO_EN;
					UDC_EP_NUM_REG = UDC_EP_DIR;
					udc->ep0_pending = 0;
				}
			} else {
				/* ack status stage of IN transfer */
				UDC_EP_NUM_REG = 0;
				if (req)
					done(ep0, req, 0);
			}
		} else if (stat & UDC_STALL) {
			UDC_CTRL_REG = UDC_CLR_HALT;
			UDC_EP_NUM_REG = 0;
		} else {
			UDC_EP_NUM_REG = 0;
		}
	}

	/* SETUP starts all control transfers */
	if (irq_src & UDC_SETUP) {
		union u {
			u16			word[4];
			struct usb_ctrlrequest	r;
		} u;
		int			status = -EINVAL;
		struct omap_ep		*ep;

		/* read the (latest) SETUP message */
		do {
			UDC_EP_NUM_REG = UDC_SETUP_SEL;
			/* two bytes at a time */
			u.word[0] = UDC_DATA_REG;
			u.word[1] = UDC_DATA_REG;
			u.word[2] = UDC_DATA_REG;
			u.word[3] = UDC_DATA_REG;
			UDC_EP_NUM_REG = 0;
		} while (UDC_IRQ_SRC_REG & UDC_SETUP);
		le16_to_cpus (&u.r.wValue);
		le16_to_cpus (&u.r.wIndex);
		le16_to_cpus (&u.r.wLength);

		/* Delegate almost all control requests to the gadget driver,
		 * except for a handful of ch9 status/feature requests that
		 * hardware doesn't autodecode _and_ the gadget API hides.
		 */
		udc->ep0_in = (u.r.bRequestType & USB_DIR_IN) != 0;
		udc->ep0_set_config = 0;
		udc->ep0_pending = 1;
		ep0->stopped = 0;
		ep0->ackwait = 0;
		switch (u.r.bRequest) {
		case USB_REQ_SET_CONFIGURATION:
			/* udc needs to know when ep != 0 is valid */
			if (u.r.bRequestType != USB_RECIP_DEVICE)
				goto delegate;
			if (u.r.wLength != 0)
				goto do_stall;
			udc->ep0_set_config = 1;
			udc->ep0_reset_config = (u.r.wValue == 0);
			VDBG("set config %d\n", u.r.wValue);

			/* update udc NOW since gadget driver may start
			 * queueing requests immediately; clear config
			 * later if it fails the request.
			 */
			if (udc->ep0_reset_config)
				UDC_SYSCON2_REG = UDC_CLR_CFG;
			else
				UDC_SYSCON2_REG = UDC_DEV_CFG;
			update_otg(udc);
			goto delegate;
		case USB_REQ_CLEAR_FEATURE:
			/* clear endpoint halt */
			if (u.r.bRequestType != USB_RECIP_ENDPOINT)
				goto delegate;
			if (u.r.wValue != USB_ENDPOINT_HALT
					|| u.r.wLength != 0)
				goto do_stall;
			ep = &udc->ep[u.r.wIndex & 0xf];
			if (ep != ep0) {
				if (u.r.wIndex & USB_DIR_IN)
					ep += 16;
				if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
						|| !ep->desc)
					goto do_stall;
				use_ep(ep, 0);
				UDC_CTRL_REG = UDC_RESET_EP;
				ep->ackwait = 0;
				if (!(ep->bEndpointAddress & USB_DIR_IN)) {
					UDC_CTRL_REG = UDC_SET_FIFO_EN;
					ep->ackwait = 1 + ep->double_buf;
				}
			}
			VDBG("%s halt cleared by host\n", ep->name);
			goto ep0out_status_stage;
		case USB_REQ_SET_FEATURE:
			/* set endpoint halt */
			if (u.r.bRequestType != USB_RECIP_ENDPOINT)
				goto delegate;
			if (u.r.wValue != USB_ENDPOINT_HALT
					|| u.r.wLength != 0)
				goto do_stall;
			ep = &udc->ep[u.r.wIndex & 0xf];
			if (u.r.wIndex & USB_DIR_IN)
				ep += 16;
			if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
					|| ep == ep0 || !ep->desc)
				goto do_stall;
			if (use_dma && ep->has_dma) {
				/* this has rude side-effects (aborts) and
				 * can't really work if DMA-IN is active
				 */
				DBG("%s host set_halt, NYET \n", ep->name);
				goto do_stall;
			}
			use_ep(ep, 0);
			/* can't halt if fifo isn't empty... */
			UDC_CTRL_REG = UDC_CLR_EP;
			UDC_CTRL_REG = UDC_SET_HALT;
			VDBG("%s halted by host\n", ep->name);
ep0out_status_stage:
			status = 0;
			UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
			UDC_CTRL_REG = UDC_CLR_EP;
			UDC_CTRL_REG = UDC_SET_FIFO_EN;
			UDC_EP_NUM_REG = UDC_EP_DIR;
			udc->ep0_pending = 0;
			break;
		case USB_REQ_GET_STATUS:
			/* return interface status.  if we were pedantic,
			 * we'd detect non-existent interfaces, and stall.
			 */
			if (u.r.bRequestType
					!= (USB_DIR_IN|USB_RECIP_INTERFACE))
				goto delegate;
			/* return two zero bytes */
			UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
			UDC_DATA_REG = 0;
			UDC_CTRL_REG = UDC_SET_FIFO_EN;
			UDC_EP_NUM_REG = UDC_EP_DIR;
			status = 0;
			VDBG("GET_STATUS, interface %d\n", u.r.wIndex);
			/* next, status stage */
			break;
		default:
delegate:
			/* activate the ep0out fifo right away */
			if (!udc->ep0_in && u.r.wLength) {
				UDC_EP_NUM_REG = 0;
				UDC_CTRL_REG = UDC_SET_FIFO_EN;
			}

			/* gadget drivers see class/vendor specific requests,
			 * {SET,GET}_{INTERFACE,DESCRIPTOR,CONFIGURATION},
			 * and more
			 */
			VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
				u.r.bRequestType, u.r.bRequest,
				u.r.wValue, u.r.wIndex, u.r.wLength);

			/* The gadget driver may return an error here,
			 * causing an immediate protocol stall.
			 *
			 * Else it must issue a response, either queueing a
			 * response buffer for the DATA stage, or halting ep0
			 * (causing a protocol stall, not a real halt).  A
			 * zero length buffer means no DATA stage.
			 *
			 * It's fine to issue that response after the setup()
			 * call returns, and this IRQ was handled.
			 */
			udc->ep0_setup = 1;
			spin_unlock(&udc->lock);
			status = udc->driver->setup (&udc->gadget, &u.r);
			spin_lock(&udc->lock);
			udc->ep0_setup = 0;
		}

		if (status < 0) {
do_stall:
			VDBG("req %02x.%02x protocol STALL; stat %d\n",
					u.r.bRequestType, u.r.bRequest, status);
			if (udc->ep0_set_config) {
				if (udc->ep0_reset_config)
					WARN("error resetting config?\n");
				else
					UDC_SYSCON2_REG = UDC_CLR_CFG;
			}
			UDC_SYSCON2_REG = UDC_STALL_CMD;
			udc->ep0_pending = 0;
		}
	}
}

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

#define OTG_FLAGS (UDC_B_HNP_ENABLE|UDC_A_HNP_SUPPORT|UDC_A_ALT_HNP_SUPPORT)

static void devstate_irq(struct omap_udc *udc, u16 irq_src)
{
	u16	devstat, change;

	devstat = UDC_DEVSTAT_REG;
	change = devstat ^ udc->devstat;
	udc->devstat = devstat;

	if (change & (UDC_USB_RESET|UDC_ATT)) {
		udc_quiesce(udc);

		if (change & UDC_ATT) {
			/* driver for any external transceiver will
			 * have called omap_vbus_session() already
			 */
			if (devstat & UDC_ATT) {
				udc->gadget.speed = USB_SPEED_FULL;
				VDBG("connect\n");
				if (!udc->transceiver)
					pullup_enable(udc);
				// if (driver->connect) call it
			} else if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
				udc->gadget.speed = USB_SPEED_UNKNOWN;
				if (!udc->transceiver)
					pullup_disable(udc);
				DBG("disconnect, gadget %s\n",
					udc->driver->driver.name);
				if (udc->driver->disconnect) {
					spin_unlock(&udc->lock);
					udc->driver->disconnect(&udc->gadget);
					spin_lock(&udc->lock);
				}
			}
			change &= ~UDC_ATT;
		}

		if (change & UDC_USB_RESET) {
			if (devstat & UDC_USB_RESET) {
				VDBG("RESET=1\n");
			} else {
				udc->gadget.speed = USB_SPEED_FULL;
				INFO("USB reset done, gadget %s\n",
					udc->driver->driver.name);
				/* ep0 traffic is legal from now on */
				UDC_IRQ_EN_REG = UDC_DS_CHG_IE | UDC_EP0_IE;
			}
			change &= ~UDC_USB_RESET;
		}
	}
	if (change & UDC_SUS) {
		if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
			// FIXME tell isp1301 to suspend/resume (?)
			if (devstat & UDC_SUS) {
				VDBG("suspend\n");
				update_otg(udc);
				/* HNP could be under way already */
				if (udc->gadget.speed == USB_SPEED_FULL
						&& udc->driver->suspend) {
					spin_unlock(&udc->lock);
					udc->driver->suspend(&udc->gadget);
					spin_lock(&udc->lock);
				}
			} else {
				VDBG("resume\n");
				if (udc->gadget.speed == USB_SPEED_FULL
						&& udc->driver->resume) {
					spin_unlock(&udc->lock);
					udc->driver->resume(&udc->gadget);
					spin_lock(&udc->lock);
				}
			}
		}
		change &= ~UDC_SUS;
	}
	if (!cpu_is_omap15xx() && (change & OTG_FLAGS)) {
		update_otg(udc);
		change &= ~OTG_FLAGS;
	}

	change &= ~(UDC_CFG|UDC_DEF|UDC_ADD);
	if (change)
		VDBG("devstat %03x, ignore change %03x\n",
			devstat,  change);

	UDC_IRQ_SRC_REG = UDC_DS_CHG;
}

static irqreturn_t
omap_udc_irq(int irq, void *_udc, struct pt_regs *r)
{
	struct omap_udc	*udc = _udc;
	u16		irq_src;
	irqreturn_t	status = IRQ_NONE;
	unsigned long	flags;

	spin_lock_irqsave(&udc->lock, flags);
	irq_src = UDC_IRQ_SRC_REG;

	/* Device state change (usb ch9 stuff) */
	if (irq_src & UDC_DS_CHG) {
		devstate_irq(_udc, irq_src);
		status = IRQ_HANDLED;
		irq_src &= ~UDC_DS_CHG;
	}

	/* EP0 control transfers */
	if (irq_src & (UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX)) {
		ep0_irq(_udc, irq_src);
		status = IRQ_HANDLED;
		irq_src &= ~(UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX);
	}

	/* DMA transfer completion */
	if (use_dma && (irq_src & (UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT))) {
		dma_irq(_udc, irq_src);
		status = IRQ_HANDLED;
		irq_src &= ~(UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT);
	}

	irq_src &= ~(UDC_SOF|UDC_EPN_TX|UDC_EPN_RX);
	if (irq_src)
		DBG("udc_irq, unhandled %03x\n", irq_src);
	spin_unlock_irqrestore(&udc->lock, flags);

	return status;
}

/* workaround for seemingly-lost IRQs for RX ACKs... */
#define PIO_OUT_TIMEOUT	(jiffies + HZ/3)
#define HALF_FULL(f)	(!((f)&(UDC_NON_ISO_FIFO_FULL|UDC_NON_ISO_FIFO_EMPTY)))

static void pio_out_timer(unsigned long _ep)
{
	struct omap_ep	*ep = (void *) _ep;
	unsigned long	flags;
	u16		stat_flg;

	spin_lock_irqsave(&ep->udc->lock, flags);
	if (!list_empty(&ep->queue) && ep->ackwait) {
		use_ep(ep, 0);
		stat_flg = UDC_STAT_FLG_REG;

		if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN)
				|| (ep->double_buf && HALF_FULL(stat_flg)))) {
			struct omap_req	*req;

			VDBG("%s: lose, %04x\n", ep->ep.name, stat_flg);
			req = container_of(ep->queue.next,
					struct omap_req, queue);
			UDC_EP_NUM_REG = ep->bEndpointAddress | UDC_EP_SEL;
			(void) read_fifo(ep, req);
			UDC_EP_NUM_REG = ep->bEndpointAddress;
			UDC_CTRL_REG = UDC_SET_FIFO_EN;
			ep->ackwait = 1 + ep->double_buf;
		}
	}
	mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
	spin_unlock_irqrestore(&ep->udc->lock, flags);
}

static irqreturn_t
omap_udc_pio_irq(int irq, void *_dev, struct pt_regs *r)
{
	u16		epn_stat, irq_src;
	irqreturn_t	status = IRQ_NONE;
	struct omap_ep	*ep;
	int		epnum;
	struct omap_udc	*udc = _dev;
	struct omap_req	*req;
	unsigned long	flags;

	spin_lock_irqsave(&udc->lock, flags);
	epn_stat = UDC_EPN_STAT_REG;
	irq_src = UDC_IRQ_SRC_REG;

	/* handle OUT first, to avoid some wasteful NAKs */
	if (irq_src & UDC_EPN_RX) {
		epnum = (epn_stat >> 8) & 0x0f;
		UDC_IRQ_SRC_REG = UDC_EPN_RX;
		status = IRQ_HANDLED;
		ep = &udc->ep[epnum];
		ep->irqs++;

		UDC_EP_NUM_REG = epnum | UDC_EP_SEL;
		ep->fnf = 0;
		if ((UDC_STAT_FLG_REG & UDC_ACK)) {
			ep->ackwait--;
			if (!list_empty(&ep->queue)) {
				int stat;
				req = container_of(ep->queue.next,
						struct omap_req, queue);
				stat = read_fifo(ep, req);
				if (!ep->double_buf)
					ep->fnf = 1;
			}
		}
		/* min 6 clock delay before clearing EP_SEL ... */
		epn_stat = UDC_EPN_STAT_REG;
		epn_stat = UDC_EPN_STAT_REG;
		UDC_EP_NUM_REG = epnum;

		/* enabling fifo _after_ clearing ACK, contrary to docs,
		 * reduces lossage; timer still needed though (sigh).
		 */
		if (ep->fnf) {
			UDC_CTRL_REG = UDC_SET_FIFO_EN;
			ep->ackwait = 1 + ep->double_buf;
		}
		mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
	}

	/* then IN transfers */
	else if (irq_src & UDC_EPN_TX) {
		epnum = epn_stat & 0x0f;
		UDC_IRQ_SRC_REG = UDC_EPN_TX;
		status = IRQ_HANDLED;
		ep = &udc->ep[16 + epnum];
		ep->irqs++;

		UDC_EP_NUM_REG = epnum | UDC_EP_DIR | UDC_EP_SEL;
		if ((UDC_STAT_FLG_REG & UDC_ACK)) {
			ep->ackwait = 0;
			if (!list_empty(&ep->queue)) {
				req = container_of(ep->queue.next,
						struct omap_req, queue);
				(void) write_fifo(ep, req);
			}
		}
		/* min 6 clock delay before clearing EP_SEL ... */
		epn_stat = UDC_EPN_STAT_REG;
		epn_stat = UDC_EPN_STAT_REG;
		UDC_EP_NUM_REG = epnum | UDC_EP_DIR;
		/* then 6 clocks before it'd tx */
	}

	spin_unlock_irqrestore(&udc->lock, flags);
	return status;
}

#ifdef	USE_ISO
static irqreturn_t
omap_udc_iso_irq(int irq, void *_dev, struct pt_regs *r)
{
	struct omap_udc	*udc = _dev;
	struct omap_ep	*ep;
	int		pending = 0;
	unsigned long	flags;

	spin_lock_irqsave(&udc->lock, flags);

	/* handle all non-DMA ISO transfers */
	list_for_each_entry (ep, &udc->iso, iso) {
		u16		stat;
		struct omap_req	*req;

		if (ep->has_dma || list_empty(&ep->queue))
			continue;
		req = list_entry(ep->queue.next, struct omap_req, queue);

		use_ep(ep, UDC_EP_SEL);
		stat = UDC_STAT_FLG_REG;

		/* NOTE: like the other controller drivers, this isn't
		 * currently reporting lost or damaged frames.
		 */
		if (ep->bEndpointAddress & USB_DIR_IN) {
			if (stat & UDC_MISS_IN)
				/* done(ep, req, -EPROTO) */;
			else
				write_fifo(ep, req);
		} else {
			int	status = 0;

			if (stat & UDC_NO_RXPACKET)
				status = -EREMOTEIO;
			else if (stat & UDC_ISO_ERR)
				status = -EILSEQ;
			else if (stat & UDC_DATA_FLUSH)
				status = -ENOSR;

			if (status)
				/* done(ep, req, status) */;
			else
				read_fifo(ep, req);
		}
		deselect_ep();
		/* 6 wait states before next EP */

		ep->irqs++;
		if (!list_empty(&ep->queue))
			pending = 1;
	}
	if (!pending)
		UDC_IRQ_EN_REG &= ~UDC_SOF_IE;
	UDC_IRQ_SRC_REG = UDC_SOF;

	spin_unlock_irqrestore(&udc->lock, flags);
	return IRQ_HANDLED;
}
#endif

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

static struct omap_udc *udc;

int usb_gadget_register_driver (struct usb_gadget_driver *driver)
{
	int		status = -ENODEV;
	struct omap_ep	*ep;
	unsigned long	flags;

	/* basic sanity tests */
	if (!udc)
		return -ENODEV;
	if (!driver
			// FIXME if otg, check:  driver->is_otg
			|| driver->speed < USB_SPEED_FULL
			|| !driver->bind
			|| !driver->unbind
			|| !driver->setup)
		return -EINVAL;

	spin_lock_irqsave(&udc->lock, flags);
	if (udc->driver) {
		spin_unlock_irqrestore(&udc->lock, flags);
		return -EBUSY;
	}

	/* reset state */
	list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
		ep->irqs = 0;
		if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
			continue;
		use_ep(ep, 0);
		UDC_CTRL_REG = UDC_SET_HALT;
	}
	udc->ep0_pending = 0;
	udc->ep[0].irqs = 0;
	udc->softconnect = 1;

	/* hook up the driver */
	driver->driver.bus = 0;
	udc->driver = driver;
	udc->gadget.dev.driver = &driver->driver;
	spin_unlock_irqrestore(&udc->lock, flags);

	status = driver->bind (&udc->gadget);
	if (status) {
		DBG("bind to %s --> %d\n", driver->driver.name, status);
		udc->gadget.dev.driver = 0;
		udc->driver = 0;
		goto done;
	}
	DBG("bound to driver %s\n", driver->driver.name);

	UDC_IRQ_SRC_REG = UDC_IRQ_SRC_MASK;

	/* connect to bus through transceiver */
	if (udc->transceiver) {
		status = otg_set_peripheral(udc->transceiver, &udc->gadget);
		if (status < 0) {
			ERR("can't bind to transceiver\n");
			driver->unbind (&udc->gadget);
			udc->gadget.dev.driver = 0;
			udc->driver = 0;
			goto done;
		}
	} else {
		if (can_pullup(udc))
			pullup_enable (udc);
		else
			pullup_disable (udc);
	}

	/* boards that don't have VBUS sensing can't autogate 48MHz;
	 * can't enter deep sleep while a gadget driver is active.
	 */
	if (machine_is_omap_innovator() || machine_is_omap_osk())
		omap_vbus_session(&udc->gadget, 1);

done:
	return status;
}
EXPORT_SYMBOL(usb_gadget_register_driver);

int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
{
	unsigned long	flags;
	int		status = -ENODEV;

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

	if (machine_is_omap_innovator() || machine_is_omap_osk())
		omap_vbus_session(&udc->gadget, 0);

	if (udc->transceiver)
		(void) otg_set_peripheral(udc->transceiver, 0);
	else
		pullup_disable(udc);

	spin_lock_irqsave(&udc->lock, flags);
	udc_quiesce(udc);
	spin_unlock_irqrestore(&udc->lock, flags);

	driver->unbind(&udc->gadget);
	udc->gadget.dev.driver = 0;
	udc->driver = 0;


	DBG("unregistered driver '%s'\n", driver->driver.name);
	return status;
}
EXPORT_SYMBOL(usb_gadget_unregister_driver);


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

#ifdef CONFIG_USB_GADGET_DEBUG_FILES

#include <linux/seq_file.h>

static const char proc_filename[] = "driver/udc";

#define FOURBITS "%s%s%s%s"
#define EIGHTBITS FOURBITS FOURBITS

static void proc_ep_show(struct seq_file *s, struct omap_ep *ep)
{
	u16		stat_flg;
	struct omap_req	*req;
	char		buf[20];

	use_ep(ep, 0);

	if (use_dma && ep->has_dma)
		snprintf(buf, sizeof buf, "(%cxdma%d lch%d) ",
			(ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
			ep->dma_channel - 1, ep->lch);
	else
		buf[0] = 0;

	stat_flg = UDC_STAT_FLG_REG;
	seq_printf(s,
		"\n%s %s%s%sirqs %ld stat %04x " EIGHTBITS FOURBITS "%s\n",
		ep->name, buf,
		ep->double_buf ? "dbuf " : "",
		({char *s; switch(ep->ackwait){
		case 0: s = ""; break;
		case 1: s = "(ackw) "; break;
		case 2: s = "(ackw2) "; break;
		default: s = "(?) "; break;
		} s;}),
		ep->irqs, stat_flg,
		(stat_flg & UDC_NO_RXPACKET) ? "no_rxpacket " : "",
		(stat_flg & UDC_MISS_IN) ? "miss_in " : "",
		(stat_flg & UDC_DATA_FLUSH) ? "data_flush " : "",
		(stat_flg & UDC_ISO_ERR) ? "iso_err " : "",
		(stat_flg & UDC_ISO_FIFO_EMPTY) ? "iso_fifo_empty " : "",
		(stat_flg & UDC_ISO_FIFO_FULL) ? "iso_fifo_full " : "",
		(stat_flg & UDC_EP_HALTED) ? "HALT " : "",
		(stat_flg & UDC_STALL) ? "STALL " : "",
		(stat_flg & UDC_NAK) ? "NAK " : "",
		(stat_flg & UDC_ACK) ? "ACK " : "",
		(stat_flg & UDC_FIFO_EN) ? "fifo_en " : "",
		(stat_flg & UDC_NON_ISO_FIFO_EMPTY) ? "fifo_empty " : "",
		(stat_flg & UDC_NON_ISO_FIFO_FULL) ? "fifo_full " : "");

	if (list_empty (&ep->queue))
		seq_printf(s, "\t(queue empty)\n");
	else
		list_for_each_entry (req, &ep->queue, queue) {
			unsigned	length = req->req.actual;

			if (use_dma && buf[0]) {
				length += ((ep->bEndpointAddress & USB_DIR_IN)
						? dma_src_len : dma_dest_len)
					(ep, req->req.dma + length);
				buf[0] = 0;
			}
			seq_printf(s, "\treq %p len %d/%d buf %p\n",
					&req->req, length,
					req->req.length, req->req.buf);
		}
}

static char *trx_mode(unsigned m, int enabled)
{
	switch (m) {
	case 0:		return enabled ? "*6wire" : "unused";
	case 1:		return "4wire";
	case 2:		return "3wire";
	case 3: 	return "6wire";
	default:	return "unknown";
	}
}

static int proc_otg_show(struct seq_file *s)
{
	u32		tmp;
	u32		trans;

	tmp = OTG_REV_REG;
	trans = USB_TRANSCEIVER_CTRL_REG;
	seq_printf(s, "OTG rev %d.%d, transceiver_ctrl %03x\n",
		tmp >> 4, tmp & 0xf, trans);
	tmp = OTG_SYSCON_1_REG;
	seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s,"
			FOURBITS "\n", tmp,
		trx_mode(USB2_TRX_MODE(tmp), trans & CONF_USB2_UNI_R),
		trx_mode(USB1_TRX_MODE(tmp), trans & CONF_USB1_UNI_R),
		(USB0_TRX_MODE(tmp) == 0)
			? "internal"
			: trx_mode(USB0_TRX_MODE(tmp), 1),
		(tmp & OTG_IDLE_EN) ? " !otg" : "",
		(tmp & HST_IDLE_EN) ? " !host" : "",
		(tmp & DEV_IDLE_EN) ? " !dev" : "",
		(tmp & OTG_RESET_DONE) ? " reset_done" : " reset_active");
	tmp = OTG_SYSCON_2_REG;
	seq_printf(s, "otg_syscon2 %08x%s" EIGHTBITS
			" b_ase_brst=%d hmc=%d\n", tmp,
		(tmp & OTG_EN) ? " otg_en" : "",
		(tmp & USBX_SYNCHRO) ? " synchro" : "",
		// much more SRP stuff
		(tmp & SRP_DATA) ? " srp_data" : "",
		(tmp & SRP_VBUS) ? " srp_vbus" : "",
		(tmp & OTG_PADEN) ? " otg_paden" : "",
		(tmp & HMC_PADEN) ? " hmc_paden" : "",
		(tmp & UHOST_EN) ? " uhost_en" : "",
		(tmp & HMC_TLLSPEED) ? " tllspeed" : "",
		(tmp & HMC_TLLATTACH) ? " tllattach" : "",
		B_ASE_BRST(tmp),
		OTG_HMC(tmp));
	tmp = OTG_CTRL_REG;
	seq_printf(s, "otg_ctrl    %06x" EIGHTBITS EIGHTBITS "%s\n", tmp,
		(tmp & OTG_ASESSVLD) ? " asess" : "",
		(tmp & OTG_BSESSEND) ? " bsess_end" : "",
		(tmp & OTG_BSESSVLD) ? " bsess" : "",
		(tmp & OTG_VBUSVLD) ? " vbus" : "",
		(tmp & OTG_ID) ? " id" : "",
		(tmp & OTG_DRIVER_SEL) ? " DEVICE" : " HOST",
		(tmp & OTG_A_SETB_HNPEN) ? " a_setb_hnpen" : "",
		(tmp & OTG_A_BUSREQ) ? " a_bus" : "",
		(tmp & OTG_B_HNPEN) ? " b_hnpen" : "",
		(tmp & OTG_B_BUSREQ) ? " b_bus" : "",
		(tmp & OTG_BUSDROP) ? " busdrop" : "",
		(tmp & OTG_PULLDOWN) ? " down" : "",
		(tmp & OTG_PULLUP) ? " up" : "",
		(tmp & OTG_DRV_VBUS) ? " drv" : "",
		(tmp & OTG_PD_VBUS) ? " pd_vb" : "",
		(tmp & OTG_PU_VBUS) ? " pu_vb" : "",
		(tmp & OTG_PU_ID) ? " pu_id" : ""
		);
	tmp = OTG_IRQ_EN_REG;
	seq_printf(s, "otg_irq_en  %04x" "\n", tmp);
	tmp = OTG_IRQ_SRC_REG;
	seq_printf(s, "otg_irq_src %04x" "\n", tmp);
	tmp = OTG_OUTCTRL_REG;
	seq_printf(s, "otg_outctrl %04x" "\n", tmp);
	tmp = OTG_TEST_REG;
	seq_printf(s, "otg_test    %04x" "\n", tmp);
}

static int proc_udc_show(struct seq_file *s, void *_)
{
	u32		tmp;
	struct omap_ep	*ep;
	unsigned long	flags;

	spin_lock_irqsave(&udc->lock, flags);

	seq_printf(s, "%s, version: " DRIVER_VERSION
#ifdef	USE_ISO
		" (iso)"
#endif
		"%s\n",
		driver_desc,
		use_dma ?  " (dma)" : "");

	tmp = UDC_REV_REG & 0xff; 
	seq_printf(s,
		"UDC rev %d.%d, fifo mode %d, gadget %s\n"
		"hmc %d, transceiver %s\n",
		tmp >> 4, tmp & 0xf,
		fifo_mode,
		udc->driver ? udc->driver->driver.name : "(none)",
		HMC,
		udc->transceiver ? udc->transceiver->label : "(none)");
	seq_printf(s, "ULPD control %04x req %04x status %04x\n",
		__REG16(ULPD_CLOCK_CTRL),
		__REG16(ULPD_SOFT_REQ),
		__REG16(ULPD_STATUS_REQ));

	/* OTG controller registers */
	if (!cpu_is_omap15xx())
		proc_otg_show(s);

	tmp = UDC_SYSCON1_REG;
	seq_printf(s, "\nsyscon1     %04x" EIGHTBITS "\n", tmp,
		(tmp & UDC_CFG_LOCK) ? " cfg_lock" : "",
		(tmp & UDC_DATA_ENDIAN) ? " data_endian" : "",
		(tmp & UDC_DMA_ENDIAN) ? " dma_endian" : "",
		(tmp & UDC_NAK_EN) ? " nak" : "",
		(tmp & UDC_AUTODECODE_DIS) ? " autodecode_dis" : "",
		(tmp & UDC_SELF_PWR) ? " self_pwr" : "",
		(tmp & UDC_SOFF_DIS) ? " soff_dis" : "",
		(tmp & UDC_PULLUP_EN) ? " PULLUP" : "");
	// syscon2 is write-only

	/* UDC controller registers */
	if (!(tmp & UDC_PULLUP_EN)) {
		seq_printf(s, "(suspended)\n");
		spin_unlock_irqrestore(&udc->lock, flags);
		return 0;
	}

	tmp = UDC_DEVSTAT_REG;
	seq_printf(s, "devstat     %04x" EIGHTBITS "%s%s\n", tmp,
		(tmp & UDC_B_HNP_ENABLE) ? " b_hnp" : "",
		(tmp & UDC_A_HNP_SUPPORT) ? " a_hnp" : "",
		(tmp & UDC_A_ALT_HNP_SUPPORT) ? " a_alt_hnp" : "",
		(tmp & UDC_R_WK_OK) ? " r_wk_ok" : "",
		(tmp & UDC_USB_RESET) ? " usb_reset" : "",
		(tmp & UDC_SUS) ? " SUS" : "",
		(tmp & UDC_CFG) ? " CFG" : "",
		(tmp & UDC_ADD) ? " ADD" : "",
		(tmp & UDC_DEF) ? " DEF" : "",
		(tmp & UDC_ATT) ? " ATT" : "");
	seq_printf(s, "sof         %04x\n", UDC_SOF_REG);
	tmp = UDC_IRQ_EN_REG;
	seq_printf(s, "irq_en      %04x" FOURBITS "%s\n", tmp,
		(tmp & UDC_SOF_IE) ? " sof" : "",
		(tmp & UDC_EPN_RX_IE) ? " epn_rx" : "",
		(tmp & UDC_EPN_TX_IE) ? " epn_tx" : "",
		(tmp & UDC_DS_CHG_IE) ? " ds_chg" : "",
		(tmp & UDC_EP0_IE) ? " ep0" : "");
	tmp = UDC_IRQ_SRC_REG;
	seq_printf(s, "irq_src     %04x" EIGHTBITS "%s%s\n", tmp,
		(tmp & UDC_TXN_DONE) ? " txn_done" : "",
		(tmp & UDC_RXN_CNT) ? " rxn_cnt" : "",
		(tmp & UDC_RXN_EOT) ? " rxn_eot" : "",
		(tmp & UDC_SOF) ? " sof" : "",
		(tmp & UDC_EPN_RX) ? " epn_rx" : "",
		(tmp & UDC_EPN_TX) ? " epn_tx" : "",
		(tmp & UDC_DS_CHG) ? " ds_chg" : "",
		(tmp & UDC_SETUP) ? " setup" : "",
		(tmp & UDC_EP0_RX) ? " ep0out" : "",
		(tmp & UDC_EP0_TX) ? " ep0in" : "");
	if (use_dma) {
		unsigned i;

		tmp = UDC_DMA_IRQ_EN_REG;
		seq_printf(s, "dma_irq_en  %04x%s" EIGHTBITS "\n", tmp,
			(tmp & UDC_TX_DONE_IE(3)) ? " tx2_done" : "",
			(tmp & UDC_RX_CNT_IE(3)) ? " rx2_cnt" : "",
			(tmp & UDC_RX_EOT_IE(3)) ? " rx2_eot" : "",

			(tmp & UDC_TX_DONE_IE(2)) ? " tx1_done" : "",
			(tmp & UDC_RX_CNT_IE(2)) ? " rx1_cnt" : "",
			(tmp & UDC_RX_EOT_IE(2)) ? " rx1_eot" : "",

			(tmp & UDC_TX_DONE_IE(1)) ? " tx0_done" : "",
			(tmp & UDC_RX_CNT_IE(1)) ? " rx0_cnt" : "",
			(tmp & UDC_RX_EOT_IE(1)) ? " rx0_eot" : "");

		tmp = UDC_RXDMA_CFG_REG;
		seq_printf(s, "rxdma_cfg   %04x\n", tmp);
		if (tmp) {
			for (i = 0; i < 3; i++) {
				if ((tmp & (0x0f << (i * 4))) == 0)
					continue;
				seq_printf(s, "rxdma[%d]    %04x\n", i,
						UDC_RXDMA_REG(i + 1));
			}
		}
		tmp = UDC_TXDMA_CFG_REG;
		seq_printf(s, "txdma_cfg   %04x\n", tmp);
		if (tmp) {
			for (i = 0; i < 3; i++) {
				if (!(tmp & (0x0f << (i * 4))))
					continue;
				seq_printf(s, "txdma[%d]    %04x\n", i,
						UDC_TXDMA_REG(i + 1));
			}
		}
	}

	tmp = UDC_DEVSTAT_REG;
	if (tmp & UDC_ATT) {
		proc_ep_show(s, &udc->ep[0]);
		if (tmp & UDC_ADD) {
			list_for_each_entry (ep, &udc->gadget.ep_list,
					ep.ep_list) {
				if (ep->desc)
					proc_ep_show(s, ep);
			}
		}
	}
	spin_unlock_irqrestore(&udc->lock, flags);
	return 0;
}

static int proc_udc_open(struct inode *inode, struct file *file)
{
	return single_open(file, proc_udc_show, 0);
}

static struct file_operations proc_ops = {
	.open		= proc_udc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static void create_proc_file(void)
{
	struct proc_dir_entry *pde;

	pde = create_proc_entry (proc_filename, 0, NULL);
	if (pde)
		pde->proc_fops = &proc_ops;
}

static void remove_proc_file(void)
{
	remove_proc_entry(proc_filename, 0);
}

#else

static inline void create_proc_file(void) {}
static inline void remove_proc_file(void) {}

#endif

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

/* Before this controller can enumerate, we need to pick an endpoint
 * configuration, or "fifo_mode"  That involves allocating 2KB of packet
 * buffer space among the endpoints we'll be operating.
 */
static unsigned __init
omap_ep_setup(char *name, u8 addr, u8 type,
		unsigned buf, unsigned maxp, int dbuf)
{
	struct omap_ep	*ep;
	u16		epn_rxtx = 0;

	/* OUT endpoints first, then IN */
	ep = &udc->ep[addr & 0xf];
	if (addr & USB_DIR_IN)
		ep += 16;

	/* in case of ep init table bugs */
	BUG_ON(ep->name[0]);

	/* chip setup ... bit values are same for IN, OUT */
	if (type == USB_ENDPOINT_XFER_ISOC) {
		switch (maxp) {
		case 8:		epn_rxtx = 0 << 12; break;
		case 16:	epn_rxtx = 1 << 12; break;
		case 32:	epn_rxtx = 2 << 12; break;
		case 64:	epn_rxtx = 3 << 12; break;
		case 128:	epn_rxtx = 4 << 12; break;
		case 256:	epn_rxtx = 5 << 12; break;
		case 512:	epn_rxtx = 6 << 12; break;
		default:	BUG();
		}
		epn_rxtx |= UDC_EPN_RX_ISO;
		dbuf = 1;
	} else {
		/* double-buffering "not supported" on 15xx,
		 * and ignored for PIO-IN on 16xx
		 */
		if (!use_dma || cpu_is_omap15xx())
			dbuf = 0;

		switch (maxp) {
		case 8:		epn_rxtx = 0 << 12; break;
		case 16:	epn_rxtx = 1 << 12; break;
		case 32:	epn_rxtx = 2 << 12; break;
		case 64:	epn_rxtx = 3 << 12; break;
		default:	BUG();
		}
		if (dbuf && addr)
			epn_rxtx |= UDC_EPN_RX_DB;
		init_timer(&ep->timer);
		ep->timer.function = pio_out_timer;
		ep->timer.data = (unsigned long) ep;
	}
	if (addr)
		epn_rxtx |= UDC_EPN_RX_VALID;
	BUG_ON(buf & 0x07);
	epn_rxtx |= buf >> 3;

	DBG("%s addr %02x rxtx %04x maxp %d%s buf %d\n",
		name, addr, epn_rxtx, maxp, dbuf ? "x2" : "", buf);

	if (addr & USB_DIR_IN)
		UDC_EP_TX_REG(addr & 0xf) = epn_rxtx;
	else
		UDC_EP_RX_REG(addr) = epn_rxtx;

	/* next endpoint's buffer starts after this one's */
	buf += maxp;
	if (dbuf)
		buf += maxp;
	BUG_ON(buf > 2048);

	/* set up driver data structures */
	BUG_ON(strlen(name) >= sizeof ep->name);
	strlcpy(ep->name, name, sizeof ep->name);
	INIT_LIST_HEAD(&ep->queue);
	INIT_LIST_HEAD(&ep->iso);
	ep->bEndpointAddress = addr;
	ep->bmAttributes = type;
	ep->double_buf = dbuf;
	ep->udc = udc; 

	ep->ep.name = ep->name;
	ep->ep.ops = &omap_ep_ops;
	ep->ep.maxpacket = ep->maxpacket = maxp;
	list_add_tail (&ep->ep.ep_list, &udc->gadget.ep_list);

	return buf;
}

static void omap_udc_release(struct device *dev)
{
	complete(udc->done);
	kfree (udc);
	udc = 0;
}

static int __init
omap_udc_setup(struct platform_device *odev, struct otg_transceiver *xceiv)
{
	unsigned	tmp, buf;

	/* abolish any previous hardware state */
	UDC_SYSCON1_REG = 0;
	UDC_IRQ_EN_REG = 0;
	UDC_IRQ_SRC_REG = UDC_IRQ_SRC_MASK;
	UDC_DMA_IRQ_EN_REG = 0;
	UDC_RXDMA_CFG_REG = 0;
	UDC_TXDMA_CFG_REG = 0;

	/* UDC_PULLUP_EN gates the chip clock */
	// OTG_SYSCON_1_REG |= DEV_IDLE_EN;

	udc = kmalloc (sizeof *udc, SLAB_KERNEL);
	if (!udc)
		return -ENOMEM;

	memset(udc, 0, sizeof *udc);
	spin_lock_init (&udc->lock);

	udc->gadget.ops = &omap_gadget_ops;
	udc->gadget.ep0 = &udc->ep[0].ep;
	INIT_LIST_HEAD(&udc->gadget.ep_list);
	INIT_LIST_HEAD(&udc->iso);
	udc->gadget.speed = USB_SPEED_UNKNOWN;
	udc->gadget.name = driver_name;

	device_initialize(&udc->gadget.dev);
	strcpy (udc->gadget.dev.bus_id, "gadget");
	udc->gadget.dev.release = omap_udc_release;
	udc->gadget.dev.parent = &odev->dev;
	if (use_dma)
		udc->gadget.dev.dma_mask = odev->dev.dma_mask;

	udc->transceiver = xceiv;

	/* ep0 is special; put it right after the SETUP buffer */
	buf = omap_ep_setup("ep0", 0, USB_ENDPOINT_XFER_CONTROL,
			8 /* after SETUP */, 64 /* maxpacket */, 0);
	list_del_init(&udc->ep[0].ep.ep_list);

	/* initially disable all non-ep0 endpoints */
	for (tmp = 1; tmp < 15; tmp++) {
		UDC_EP_RX_REG(tmp) = 0;
		UDC_EP_TX_REG(tmp) = 0;
	}

#define OMAP_BULK_EP(name,addr) \
	buf = omap_ep_setup(name "-bulk", addr, \
			USB_ENDPOINT_XFER_BULK, buf, 64, 1);
#define OMAP_INT_EP(name,addr, maxp) \
	buf = omap_ep_setup(name "-int", addr, \
			USB_ENDPOINT_XFER_INT, buf, maxp, 0);
#define OMAP_ISO_EP(name,addr, maxp) \
	buf = omap_ep_setup(name "-iso", addr, \
			USB_ENDPOINT_XFER_ISOC, buf, maxp, 1);

	switch (fifo_mode) {
	case 0:
		OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
		OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
		OMAP_INT_EP("ep3in",   USB_DIR_IN  | 3, 16);
		break;
	case 1:
		OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
		OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
		OMAP_BULK_EP("ep3in",  USB_DIR_IN  | 3);
		OMAP_BULK_EP("ep4out", USB_DIR_OUT | 4);

		OMAP_BULK_EP("ep5in",  USB_DIR_IN  | 5);
		OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
		OMAP_BULK_EP("ep6in",  USB_DIR_IN  | 6);
		OMAP_BULK_EP("ep6out", USB_DIR_OUT | 6);

		OMAP_BULK_EP("ep7in",  USB_DIR_IN  | 7);
		OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
		OMAP_BULK_EP("ep8in",  USB_DIR_IN  | 8);
		OMAP_BULK_EP("ep8out", USB_DIR_OUT | 8);

		OMAP_INT_EP("ep9in",   USB_DIR_IN  | 9, 16);
		OMAP_INT_EP("ep10out", USB_DIR_IN  | 10, 16);
		OMAP_INT_EP("ep11in",  USB_DIR_IN  | 9, 16);
		OMAP_INT_EP("ep12out", USB_DIR_IN  | 10, 16);
		break;

#ifdef	USE_ISO
	case 2:			/* mixed iso/bulk */
		OMAP_ISO_EP("ep1in",   USB_DIR_IN  | 1, 256);
		OMAP_ISO_EP("ep2out",  USB_DIR_OUT | 2, 256);
		OMAP_ISO_EP("ep3in",   USB_DIR_IN  | 3, 128);
		OMAP_ISO_EP("ep4out",  USB_DIR_OUT | 4, 128);

		OMAP_INT_EP("ep5in",   USB_DIR_IN  | 5, 16);

		OMAP_BULK_EP("ep6in",  USB_DIR_IN  | 6);
		OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
		OMAP_INT_EP("ep8in",   USB_DIR_IN  | 8, 16);
		break;
	case 3:			/* mixed bulk/iso */
		OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
		OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
		OMAP_INT_EP("ep3in",   USB_DIR_IN  | 3, 16);

		OMAP_BULK_EP("ep4in",  USB_DIR_IN  | 4);
		OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
		OMAP_INT_EP("ep6in",   USB_DIR_IN  | 6, 16);

		OMAP_ISO_EP("ep7in",   USB_DIR_IN  | 7, 256);
		OMAP_ISO_EP("ep8out",  USB_DIR_OUT | 8, 256);
		OMAP_INT_EP("ep9in",   USB_DIR_IN  | 9, 16);
		break;
#endif

	/* add more modes as needed */

	default:
		ERR("unsupported fifo_mode #%d\n", fifo_mode);
		return -ENODEV;
	}
	UDC_SYSCON1_REG = UDC_CFG_LOCK|UDC_SELF_PWR;
	INFO("fifo mode %d, %d bytes not used\n", fifo_mode, 2048 - buf);
	return 0;
}

static int __init omap_udc_probe(struct device *dev)
{
	struct platform_device	*odev = to_platform_device(dev);
	int			status = -ENODEV;
	int			hmc;
	struct otg_transceiver	*xceiv = 0;
	const char		*type = 0;
	struct omap_usb_config	*config = dev->platform_data;

	/* NOTE:  "knows" the order of the resources! */
	if (!request_mem_region(odev->resource[0].start, 
			odev->resource[0].end - odev->resource[0].start + 1,
			driver_name)) {
		DBG("request_mem_region failed\n");
		return -EBUSY;
	}

	INFO("OMAP UDC rev %d.%d%s\n",
		UDC_REV_REG >> 4, UDC_REV_REG & 0xf,
		config->otg ? ", Mini-AB" : "");

	/* use the mode given to us by board init code */
	if (cpu_is_omap15xx()) {
		hmc = HMC_1510;
		type = "(unknown)";

		if (machine_is_omap_innovator()) {
			/* just set up software VBUS detect, and then
			 * later rig it so we always report VBUS.
			 * FIXME without really sensing VBUS, we can't
			 * know when to turn PULLUP_EN on/off; and that
			 * means we always "need" the 48MHz clock.
			 */
			u32 tmp = FUNC_MUX_CTRL_0_REG;

			FUNC_MUX_CTRL_0_REG &= ~VBUS_CTRL_1510;
			tmp |= VBUS_MODE_1510;
			tmp &= ~VBUS_CTRL_1510;
			FUNC_MUX_CTRL_0_REG = tmp;
		}
	} else {
		hmc = HMC_1610;
		switch (hmc) {
		case 3:
		case 11:
		case 16:
		case 19:
		case 25:
			xceiv = otg_get_transceiver();
			if (!xceiv) {
				DBG("external transceiver not registered!\n");
				if (config->otg)
					goto cleanup0;
				type = "(unknown external)";
			} else
				type = xceiv->label;
			break;
		case 0:			/* POWERUP DEFAULT == 0 */
		case 4:
		case 12:
		case 20:
			type = "INTEGRATED";
			break;
		case 21:			/* internal loopback */
			type = "(loopback)";
			break;
		case 14:			/* transceiverless */
			type = "(none)";
			break;

		default:
			ERR("unrecognized UDC HMC mode %d\n", hmc);
			return -ENODEV;
		}
	}
	INFO("hmc mode %d, transceiver %s\n", hmc, type);

	/* a "gadget" abstracts/virtualizes the controller */
	status = omap_udc_setup(odev, xceiv);
	if (status) {
		goto cleanup0;
	}
	xceiv = 0;
	// "udc" is now valid
	pullup_disable(udc);
#if	defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
	udc->gadget.is_otg = (config->otg != 0);
#endif

	/* USB general purpose IRQ:  ep0, state changes, dma, etc */
	status = request_irq(odev->resource[1].start, omap_udc_irq,
			SA_SAMPLE_RANDOM, driver_name, udc);
	if (status != 0) {
		ERR( "can't get irq %ld, err %d\n",
			odev->resource[1].start, status);
		goto cleanup1;
	}

	/* USB "non-iso" IRQ (PIO for all but ep0) */
	status = request_irq(odev->resource[2].start, omap_udc_pio_irq,
			SA_SAMPLE_RANDOM, "omap_udc pio", udc);
	if (status != 0) {
		ERR( "can't get irq %ld, err %d\n",
			odev->resource[2].start, status);
		goto cleanup2;
	}
#ifdef	USE_ISO
	status = request_irq(odev->resource[3].start, omap_udc_iso_irq,
			SA_INTERRUPT, "omap_udc iso", udc);
	if (status != 0) {
		ERR("can't get irq %ld, err %d\n",
			odev->resource[3].start, status);
		goto cleanup3;
	}
#endif

	create_proc_file();
	device_add(&udc->gadget.dev);
	return 0;

#ifdef	USE_ISO
cleanup3:
	free_irq(odev->resource[2].start, udc);
#endif

cleanup2:
	free_irq(odev->resource[1].start, udc);

cleanup1:
	kfree (udc);
	udc = 0;

cleanup0:
	if (xceiv)
		put_device(xceiv->dev);
	release_mem_region(odev->resource[0].start,
			odev->resource[0].end - odev->resource[0].start + 1);
	return status;
}

static int __exit omap_udc_remove(struct device *dev)
{
	struct platform_device	*odev = to_platform_device(dev);
	DECLARE_COMPLETION(done);

	if (!udc)
		return -ENODEV;

	udc->done = &done;

	pullup_disable(udc);
	if (udc->transceiver) {
		put_device(udc->transceiver->dev);
		udc->transceiver = 0;
	}
	UDC_SYSCON1_REG = 0;

	remove_proc_file();

#ifdef	USE_ISO
	free_irq(odev->resource[3].start, udc);
#endif
	free_irq(odev->resource[2].start, udc);
	free_irq(odev->resource[1].start, udc);

	release_mem_region(odev->resource[0].start,
			odev->resource[0].end - odev->resource[0].start + 1);

	device_unregister(&udc->gadget.dev);
	wait_for_completion(&done);

	return 0;
}

/* suspend/resume/wakeup from sysfs (echo > power/state) */

static int omap_udc_suspend(struct device *dev, u32 state, u32 level)
{
	if (level != 0)
		return 0;

	DBG("suspend, state %d\n", state);
	omap_pullup(&udc->gadget, 0);
	udc->gadget.dev.power.power_state = 3;
	udc->gadget.dev.parent->power.power_state = 3;
	return 0;
}

static int omap_udc_resume(struct device *dev, u32 level)
{
	if (level != 0)
		return 0;

	DBG("resume + wakeup/SRP\n");
	udc->gadget.dev.parent->power.power_state = 0;
	udc->gadget.dev.power.power_state = 0;
	omap_pullup(&udc->gadget, 1);

	/* maybe the host would enumerate us if we nudged it */
	msleep(100);
	return omap_wakeup(&udc->gadget);
}

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

static struct device_driver udc_driver = {
	.name		= (char *) driver_name,
	.bus		= &platform_bus_type,
	.probe		= omap_udc_probe,
	.remove		= __exit_p(omap_udc_remove),
	.suspend	= omap_udc_suspend,
	.resume		= omap_udc_resume,
};

static int __init udc_init(void)
{
	INFO("%s, version: " DRIVER_VERSION
#ifdef	USE_ISO
		" (iso)"
#endif
		"%s\n", driver_desc,
		use_dma ?  " (dma)" : "");
	return driver_register(&udc_driver);
}
module_init(udc_init);

static void __exit udc_exit(void)
{
	driver_unregister(&udc_driver);
}
module_exit(udc_exit);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");