summaryrefslogtreecommitdiff
path: root/drivers/usb/gadget/pxa25x_udc.c
blob: 365c02fc25fcf0f89668b79ce2a72933ada22a40 (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
/*
 * Intel PXA25x and IXP4xx on-chip full speed USB device controllers
 *
 * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker)
 * Copyright (C) 2003 Robert Schwebel, Pengutronix
 * Copyright (C) 2003 Benedikt Spranger, Pengutronix
 * Copyright (C) 2003 David Brownell
 * Copyright (C) 2003 Joshua Wise
 *
 * 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
 *
 */

/* #define VERBOSE_DEBUG */

#include <linux/device.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/slab.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/prefetch.h>

#include <asm/byteorder.h>
#include <asm/dma.h>
#include <asm/gpio.h>
#include <asm/system.h>
#include <asm/mach-types.h>
#include <asm/unaligned.h>

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

/*
 * This driver is PXA25x only.  Grab the right register definitions.
 */
#ifdef CONFIG_ARCH_PXA
#include <mach/pxa25x-udc.h>
#endif

#ifdef CONFIG_ARCH_LUBBOCK
#include <mach/lubbock.h>
#endif

#include <asm/mach/udc_pxa2xx.h>


/*
 * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
 * series processors.  The UDC for the IXP 4xx series is very similar.
 * There are fifteen endpoints, in addition to ep0.
 *
 * Such controller drivers work with a gadget driver.  The gadget driver
 * returns descriptors, implements configuration and data protocols used
 * by the host to interact with this device, and allocates endpoints to
 * the different protocol interfaces.  The controller driver virtualizes
 * usb hardware so that the gadget drivers will be more portable.
 *
 * This UDC hardware wants to implement a bit too much USB protocol, so
 * it constrains the sorts of USB configuration change events that work.
 * The errata for these chips are misleading; some "fixed" bugs from
 * pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
 *
 * Note that the UDC hardware supports DMA (except on IXP) but that's
 * not used here.  IN-DMA (to host) is simple enough, when the data is
 * suitably aligned (16 bytes) ... the network stack doesn't do that,
 * other software can.  OUT-DMA is buggy in most chip versions, as well
 * as poorly designed (data toggle not automatic).  So this driver won't
 * bother using DMA.  (Mostly-working IN-DMA support was available in
 * kernels before 2.6.23, but was never enabled or well tested.)
 */

#define	DRIVER_VERSION	"30-June-2007"
#define	DRIVER_DESC	"PXA 25x USB Device Controller driver"


static const char driver_name [] = "pxa25x_udc";

static const char ep0name [] = "ep0";


#ifdef CONFIG_ARCH_IXP4XX

/* cpu-specific register addresses are compiled in to this code */
#ifdef CONFIG_ARCH_PXA
#error "Can't configure both IXP and PXA"
#endif

/* IXP doesn't yet support <linux/clk.h> */
#define clk_get(dev,name)	NULL
#define clk_enable(clk)		do { } while (0)
#define clk_disable(clk)	do { } while (0)
#define clk_put(clk)		do { } while (0)

#endif

#include "pxa25x_udc.h"


#ifdef	CONFIG_USB_PXA25X_SMALL
#define SIZE_STR	" (small)"
#else
#define SIZE_STR	""
#endif

/* ---------------------------------------------------------------------------
 *	endpoint related parts of the api to the usb controller hardware,
 *	used by gadget driver; and the inner talker-to-hardware core.
 * ---------------------------------------------------------------------------
 */

static void pxa25x_ep_fifo_flush (struct usb_ep *ep);
static void nuke (struct pxa25x_ep *, int status);

/* one GPIO should control a D+ pullup, so host sees this device (or not) */
static void pullup_off(void)
{
	struct pxa2xx_udc_mach_info		*mach = the_controller->mach;
	int off_level = mach->gpio_pullup_inverted;

	if (gpio_is_valid(mach->gpio_pullup))
		gpio_set_value(mach->gpio_pullup, off_level);
	else if (mach->udc_command)
		mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
}

static void pullup_on(void)
{
	struct pxa2xx_udc_mach_info		*mach = the_controller->mach;
	int on_level = !mach->gpio_pullup_inverted;

	if (gpio_is_valid(mach->gpio_pullup))
		gpio_set_value(mach->gpio_pullup, on_level);
	else if (mach->udc_command)
		mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
}

static void pio_irq_enable(int bEndpointAddress)
{
        bEndpointAddress &= 0xf;
        if (bEndpointAddress < 8)
                UICR0 &= ~(1 << bEndpointAddress);
        else {
                bEndpointAddress -= 8;
                UICR1 &= ~(1 << bEndpointAddress);
	}
}

static void pio_irq_disable(int bEndpointAddress)
{
        bEndpointAddress &= 0xf;
        if (bEndpointAddress < 8)
                UICR0 |= 1 << bEndpointAddress;
        else {
                bEndpointAddress -= 8;
                UICR1 |= 1 << bEndpointAddress;
        }
}

/* The UDCCR reg contains mask and interrupt status bits,
 * so using '|=' isn't safe as it may ack an interrupt.
 */
#define UDCCR_MASK_BITS         (UDCCR_REM | UDCCR_SRM | UDCCR_UDE)

static inline void udc_set_mask_UDCCR(int mask)
{
	UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
}

static inline void udc_clear_mask_UDCCR(int mask)
{
	UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
}

static inline void udc_ack_int_UDCCR(int mask)
{
	/* udccr contains the bits we dont want to change */
	__u32 udccr = UDCCR & UDCCR_MASK_BITS;

	UDCCR = udccr | (mask & ~UDCCR_MASK_BITS);
}

/*
 * endpoint enable/disable
 *
 * we need to verify the descriptors used to enable endpoints.  since pxa25x
 * endpoint configurations are fixed, and are pretty much always enabled,
 * there's not a lot to manage here.
 *
 * because pxa25x can't selectively initialize bulk (or interrupt) endpoints,
 * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
 * for a single interface (with only the default altsetting) and for gadget
 * drivers that don't halt endpoints (not reset by set_interface).  that also
 * means that if you use ISO, you must violate the USB spec rule that all
 * iso endpoints must be in non-default altsettings.
 */
static int pxa25x_ep_enable (struct usb_ep *_ep,
		const struct usb_endpoint_descriptor *desc)
{
	struct pxa25x_ep        *ep;
	struct pxa25x_udc       *dev;

	ep = container_of (_ep, struct pxa25x_ep, ep);
	if (!_ep || !desc || ep->desc || _ep->name == ep0name
			|| desc->bDescriptorType != USB_DT_ENDPOINT
			|| ep->bEndpointAddress != desc->bEndpointAddress
			|| ep->fifo_size < le16_to_cpu
						(desc->wMaxPacketSize)) {
		DMSG("%s, bad ep or descriptor\n", __func__);
		return -EINVAL;
	}

	/* 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) {
		DMSG("%s, %s type mismatch\n", __func__, _ep->name);
		return -EINVAL;
	}

	/* hardware _could_ do smaller, but driver doesn't */
	if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
				&& le16_to_cpu (desc->wMaxPacketSize)
						!= BULK_FIFO_SIZE)
			|| !desc->wMaxPacketSize) {
		DMSG("%s, bad %s maxpacket\n", __func__, _ep->name);
		return -ERANGE;
	}

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

	ep->desc = desc;
	ep->stopped = 0;
	ep->pio_irqs = 0;
	ep->ep.maxpacket = le16_to_cpu (desc->wMaxPacketSize);

	/* flush fifo (mostly for OUT buffers) */
	pxa25x_ep_fifo_flush (_ep);

	/* ... reset halt state too, if we could ... */

	DBG(DBG_VERBOSE, "enabled %s\n", _ep->name);
	return 0;
}

static int pxa25x_ep_disable (struct usb_ep *_ep)
{
	struct pxa25x_ep	*ep;
	unsigned long		flags;

	ep = container_of (_ep, struct pxa25x_ep, ep);
	if (!_ep || !ep->desc) {
		DMSG("%s, %s not enabled\n", __func__,
			_ep ? ep->ep.name : NULL);
		return -EINVAL;
	}
	local_irq_save(flags);

	nuke (ep, -ESHUTDOWN);

	/* flush fifo (mostly for IN buffers) */
	pxa25x_ep_fifo_flush (_ep);

	ep->desc = NULL;
	ep->stopped = 1;

	local_irq_restore(flags);
	DBG(DBG_VERBOSE, "%s disabled\n", _ep->name);
	return 0;
}

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

/* for the pxa25x, these can just wrap kmalloc/kfree.  gadget drivers
 * must still pass correctly initialized endpoints, since other controller
 * drivers may care about how it's currently set up (dma issues etc).
 */

/*
 *	pxa25x_ep_alloc_request - allocate a request data structure
 */
static struct usb_request *
pxa25x_ep_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
{
	struct pxa25x_request *req;

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

	INIT_LIST_HEAD (&req->queue);
	return &req->req;
}


/*
 *	pxa25x_ep_free_request - deallocate a request data structure
 */
static void
pxa25x_ep_free_request (struct usb_ep *_ep, struct usb_request *_req)
{
	struct pxa25x_request	*req;

	req = container_of (_req, struct pxa25x_request, req);
	WARN_ON(!list_empty (&req->queue));
	kfree(req);
}

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

/*
 *	done - retire a request; caller blocked irqs
 */
static void done(struct pxa25x_ep *ep, struct pxa25x_request *req, int status)
{
	unsigned		stopped = ep->stopped;

	list_del_init(&req->queue);

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

	if (status && status != -ESHUTDOWN)
		DBG(DBG_VERBOSE, "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;
	req->req.complete(&ep->ep, &req->req);
	ep->stopped = stopped;
}


static inline void ep0_idle (struct pxa25x_udc *dev)
{
	dev->ep0state = EP0_IDLE;
}

static int
write_packet(volatile u32 *uddr, struct pxa25x_request *req, unsigned max)
{
	u8		*buf;
	unsigned	length, count;

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

	/* how big will this packet be? */
	length = min(req->req.length - req->req.actual, max);
	req->req.actual += length;

	count = length;
	while (likely(count--))
		*uddr = *buf++;

	return length;
}

/*
 * write to an IN endpoint fifo, as many packets as possible.
 * irqs will use this to write the rest later.
 * caller guarantees at least one packet buffer is ready (or a zlp).
 */
static int
write_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
{
	unsigned		max;

	max = le16_to_cpu(ep->desc->wMaxPacketSize);
	do {
		unsigned	count;
		int		is_last, is_short;

		count = write_packet(ep->reg_uddr, req, max);

		/* last packet is usually short (or a zlp) */
		if (unlikely (count != max))
			is_last = is_short = 1;
		else {
			if (likely(req->req.length != req->req.actual)
					|| req->req.zero)
				is_last = 0;
			else
				is_last = 1;
			/* interrupt/iso maxpacket may not fill the fifo */
			is_short = unlikely (max < ep->fifo_size);
		}

		DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n",
			ep->ep.name, count,
			is_last ? "/L" : "", is_short ? "/S" : "",
			req->req.length - req->req.actual, req);

		/* let loose that packet. maybe try writing another one,
		 * double buffering might work.  TSP, TPC, and TFS
		 * bit values are the same for all normal IN endpoints.
		 */
		*ep->reg_udccs = UDCCS_BI_TPC;
		if (is_short)
			*ep->reg_udccs = UDCCS_BI_TSP;

		/* requests complete when all IN data is in the FIFO */
		if (is_last) {
			done (ep, req, 0);
			if (list_empty(&ep->queue))
				pio_irq_disable (ep->bEndpointAddress);
			return 1;
		}

		// TODO experiment: how robust can fifo mode tweaking be?
		// double buffering is off in the default fifo mode, which
		// prevents TFS from being set here.

	} while (*ep->reg_udccs & UDCCS_BI_TFS);
	return 0;
}

/* caller asserts req->pending (ep0 irq status nyet cleared); starts
 * ep0 data stage.  these chips want very simple state transitions.
 */
static inline
void ep0start(struct pxa25x_udc *dev, u32 flags, const char *tag)
{
	UDCCS0 = flags|UDCCS0_SA|UDCCS0_OPR;
	USIR0 = USIR0_IR0;
	dev->req_pending = 0;
	DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n",
		__func__, tag, UDCCS0, flags);
}

static int
write_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
{
	unsigned	count;
	int		is_short;

	count = write_packet(&UDDR0, req, EP0_FIFO_SIZE);
	ep->dev->stats.write.bytes += count;

	/* last packet "must be" short (or a zlp) */
	is_short = (count != EP0_FIFO_SIZE);

	DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count,
		req->req.length - req->req.actual, req);

	if (unlikely (is_short)) {
		if (ep->dev->req_pending)
			ep0start(ep->dev, UDCCS0_IPR, "short IN");
		else
			UDCCS0 = UDCCS0_IPR;

		count = req->req.length;
		done (ep, req, 0);
		ep0_idle(ep->dev);
#ifndef CONFIG_ARCH_IXP4XX
#if 1
		/* This seems to get rid of lost status irqs in some cases:
		 * host responds quickly, or next request involves config
		 * change automagic, or should have been hidden, or ...
		 *
		 * FIXME get rid of all udelays possible...
		 */
		if (count >= EP0_FIFO_SIZE) {
			count = 100;
			do {
				if ((UDCCS0 & UDCCS0_OPR) != 0) {
					/* clear OPR, generate ack */
					UDCCS0 = UDCCS0_OPR;
					break;
				}
				count--;
				udelay(1);
			} while (count);
		}
#endif
#endif
	} else if (ep->dev->req_pending)
		ep0start(ep->dev, 0, "IN");
	return is_short;
}


/*
 * read_fifo -  unload packet(s) from the fifo we use for usb OUT
 * transfers and put them into the request.  caller should have made
 * sure there's at least one packet ready.
 *
 * returns true if the request completed because of short packet or the
 * request buffer having filled (and maybe overran till end-of-packet).
 */
static int
read_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
{
	for (;;) {
		u32		udccs;
		u8		*buf;
		unsigned	bufferspace, count, is_short;

		/* make sure there's a packet in the FIFO.
		 * UDCCS_{BO,IO}_RPC are all the same bit value.
		 * UDCCS_{BO,IO}_RNE are all the same bit value.
		 */
		udccs = *ep->reg_udccs;
		if (unlikely ((udccs & UDCCS_BO_RPC) == 0))
			break;
		buf = req->req.buf + req->req.actual;
		prefetchw(buf);
		bufferspace = req->req.length - req->req.actual;

		/* read all bytes from this packet */
		if (likely (udccs & UDCCS_BO_RNE)) {
			count = 1 + (0x0ff & *ep->reg_ubcr);
			req->req.actual += min (count, bufferspace);
		} else /* zlp */
			count = 0;
		is_short = (count < ep->ep.maxpacket);
		DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
			ep->ep.name, udccs, count,
			is_short ? "/S" : "",
			req, req->req.actual, req->req.length);
		while (likely (count-- != 0)) {
			u8	byte = (u8) *ep->reg_uddr;

			if (unlikely (bufferspace == 0)) {
				/* this happens when the driver's buffer
				 * is smaller than what the host sent.
				 * discard the extra data.
				 */
				if (req->req.status != -EOVERFLOW)
					DMSG("%s overflow %d\n",
						ep->ep.name, count);
				req->req.status = -EOVERFLOW;
			} else {
				*buf++ = byte;
				bufferspace--;
			}
		}
		*ep->reg_udccs =  UDCCS_BO_RPC;
		/* RPC/RSP/RNE could now reflect the other packet buffer */

		/* iso is one request per packet */
		if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
			if (udccs & UDCCS_IO_ROF)
				req->req.status = -EHOSTUNREACH;
			/* more like "is_done" */
			is_short = 1;
		}

		/* completion */
		if (is_short || req->req.actual == req->req.length) {
			done (ep, req, 0);
			if (list_empty(&ep->queue))
				pio_irq_disable (ep->bEndpointAddress);
			return 1;
		}

		/* finished that packet.  the next one may be waiting... */
	}
	return 0;
}

/*
 * special ep0 version of the above.  no UBCR0 or double buffering; status
 * handshaking is magic.  most device protocols don't need control-OUT.
 * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
 * protocols do use them.
 */
static int
read_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
{
	u8		*buf, byte;
	unsigned	bufferspace;

	buf = req->req.buf + req->req.actual;
	bufferspace = req->req.length - req->req.actual;

	while (UDCCS0 & UDCCS0_RNE) {
		byte = (u8) UDDR0;

		if (unlikely (bufferspace == 0)) {
			/* this happens when the driver's buffer
			 * is smaller than what the host sent.
			 * discard the extra data.
			 */
			if (req->req.status != -EOVERFLOW)
				DMSG("%s overflow\n", ep->ep.name);
			req->req.status = -EOVERFLOW;
		} else {
			*buf++ = byte;
			req->req.actual++;
			bufferspace--;
		}
	}

	UDCCS0 = UDCCS0_OPR | UDCCS0_IPR;

	/* completion */
	if (req->req.actual >= req->req.length)
		return 1;

	/* finished that packet.  the next one may be waiting... */
	return 0;
}

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

static int
pxa25x_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
{
	struct pxa25x_request	*req;
	struct pxa25x_ep	*ep;
	struct pxa25x_udc	*dev;
	unsigned long		flags;

	req = container_of(_req, struct pxa25x_request, req);
	if (unlikely (!_req || !_req->complete || !_req->buf
			|| !list_empty(&req->queue))) {
		DMSG("%s, bad params\n", __func__);
		return -EINVAL;
	}

	ep = container_of(_ep, struct pxa25x_ep, ep);
	if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
		DMSG("%s, bad ep\n", __func__);
		return -EINVAL;
	}

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

	/* iso is always one packet per request, that's the only way
	 * we can report per-packet status.  that also helps with dma.
	 */
	if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
			&& req->req.length > le16_to_cpu
						(ep->desc->wMaxPacketSize)))
		return -EMSGSIZE;

	DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n",
		_ep->name, _req, _req->length, _req->buf);

	local_irq_save(flags);

	_req->status = -EINPROGRESS;
	_req->actual = 0;

	/* kickstart this i/o queue? */
	if (list_empty(&ep->queue) && !ep->stopped) {
		if (ep->desc == NULL/* ep0 */) {
			unsigned	length = _req->length;

			switch (dev->ep0state) {
			case EP0_IN_DATA_PHASE:
				dev->stats.write.ops++;
				if (write_ep0_fifo(ep, req))
					req = NULL;
				break;

			case EP0_OUT_DATA_PHASE:
				dev->stats.read.ops++;
				/* messy ... */
				if (dev->req_config) {
					DBG(DBG_VERBOSE, "ep0 config ack%s\n",
						dev->has_cfr ?  "" : " raced");
					if (dev->has_cfr)
						UDCCFR = UDCCFR_AREN|UDCCFR_ACM
							|UDCCFR_MB1;
					done(ep, req, 0);
					dev->ep0state = EP0_END_XFER;
					local_irq_restore (flags);
					return 0;
				}
				if (dev->req_pending)
					ep0start(dev, UDCCS0_IPR, "OUT");
				if (length == 0 || ((UDCCS0 & UDCCS0_RNE) != 0
						&& read_ep0_fifo(ep, req))) {
					ep0_idle(dev);
					done(ep, req, 0);
					req = NULL;
				}
				break;

			default:
				DMSG("ep0 i/o, odd state %d\n", dev->ep0state);
				local_irq_restore (flags);
				return -EL2HLT;
			}
		/* can the FIFO can satisfy the request immediately? */
		} else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
			if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0
					&& write_fifo(ep, req))
				req = NULL;
		} else if ((*ep->reg_udccs & UDCCS_BO_RFS) != 0
				&& read_fifo(ep, req)) {
			req = NULL;
		}

		if (likely (req && ep->desc))
			pio_irq_enable(ep->bEndpointAddress);
	}

	/* pio or dma irq handler advances the queue. */
	if (likely(req != NULL))
		list_add_tail(&req->queue, &ep->queue);
	local_irq_restore(flags);

	return 0;
}


/*
 *	nuke - dequeue ALL requests
 */
static void nuke(struct pxa25x_ep *ep, int status)
{
	struct pxa25x_request *req;

	/* called with irqs blocked */
	while (!list_empty(&ep->queue)) {
		req = list_entry(ep->queue.next,
				struct pxa25x_request,
				queue);
		done(ep, req, status);
	}
	if (ep->desc)
		pio_irq_disable (ep->bEndpointAddress);
}


/* dequeue JUST ONE request */
static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
	struct pxa25x_ep	*ep;
	struct pxa25x_request	*req;
	unsigned long		flags;

	ep = container_of(_ep, struct pxa25x_ep, ep);
	if (!_ep || ep->ep.name == ep0name)
		return -EINVAL;

	local_irq_save(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) {
		local_irq_restore(flags);
		return -EINVAL;
	}

	done(ep, req, -ECONNRESET);

	local_irq_restore(flags);
	return 0;
}

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

static int pxa25x_ep_set_halt(struct usb_ep *_ep, int value)
{
	struct pxa25x_ep	*ep;
	unsigned long		flags;

	ep = container_of(_ep, struct pxa25x_ep, ep);
	if (unlikely (!_ep
			|| (!ep->desc && ep->ep.name != ep0name))
			|| ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
		DMSG("%s, bad ep\n", __func__);
		return -EINVAL;
	}
	if (value == 0) {
		/* this path (reset toggle+halt) is needed to implement
		 * SET_INTERFACE on normal hardware.  but it can't be
		 * done from software on the PXA UDC, and the hardware
		 * forgets to do it as part of SET_INTERFACE automagic.
		 */
		DMSG("only host can clear %s halt\n", _ep->name);
		return -EROFS;
	}

	local_irq_save(flags);

	if ((ep->bEndpointAddress & USB_DIR_IN) != 0
			&& ((*ep->reg_udccs & UDCCS_BI_TFS) == 0
			   || !list_empty(&ep->queue))) {
		local_irq_restore(flags);
		return -EAGAIN;
	}

	/* FST bit is the same for control, bulk in, bulk out, interrupt in */
	*ep->reg_udccs = UDCCS_BI_FST|UDCCS_BI_FTF;

	/* ep0 needs special care */
	if (!ep->desc) {
		start_watchdog(ep->dev);
		ep->dev->req_pending = 0;
		ep->dev->ep0state = EP0_STALL;

	/* and bulk/intr endpoints like dropping stalls too */
	} else {
		unsigned i;
		for (i = 0; i < 1000; i += 20) {
			if (*ep->reg_udccs & UDCCS_BI_SST)
				break;
			udelay(20);
		}
	}
	local_irq_restore(flags);

	DBG(DBG_VERBOSE, "%s halt\n", _ep->name);
	return 0;
}

static int pxa25x_ep_fifo_status(struct usb_ep *_ep)
{
	struct pxa25x_ep        *ep;

	ep = container_of(_ep, struct pxa25x_ep, ep);
	if (!_ep) {
		DMSG("%s, bad ep\n", __func__);
		return -ENODEV;
	}
	/* pxa can't report unclaimed bytes from IN fifos */
	if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
		return -EOPNOTSUPP;
	if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
			|| (*ep->reg_udccs & UDCCS_BO_RFS) == 0)
		return 0;
	else
		return (*ep->reg_ubcr & 0xfff) + 1;
}

static void pxa25x_ep_fifo_flush(struct usb_ep *_ep)
{
	struct pxa25x_ep        *ep;

	ep = container_of(_ep, struct pxa25x_ep, ep);
	if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
		DMSG("%s, bad ep\n", __func__);
		return;
	}

	/* toggle and halt bits stay unchanged */

	/* for OUT, just read and discard the FIFO contents. */
	if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
		while (((*ep->reg_udccs) & UDCCS_BO_RNE) != 0)
			(void) *ep->reg_uddr;
		return;
	}

	/* most IN status is the same, but ISO can't stall */
	*ep->reg_udccs = UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
		| (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
			? 0 : UDCCS_BI_SST);
}


static struct usb_ep_ops pxa25x_ep_ops = {
	.enable		= pxa25x_ep_enable,
	.disable	= pxa25x_ep_disable,

	.alloc_request	= pxa25x_ep_alloc_request,
	.free_request	= pxa25x_ep_free_request,

	.queue		= pxa25x_ep_queue,
	.dequeue	= pxa25x_ep_dequeue,

	.set_halt	= pxa25x_ep_set_halt,
	.fifo_status	= pxa25x_ep_fifo_status,
	.fifo_flush	= pxa25x_ep_fifo_flush,
};


/* ---------------------------------------------------------------------------
 *	device-scoped parts of the api to the usb controller hardware
 * ---------------------------------------------------------------------------
 */

static int pxa25x_udc_get_frame(struct usb_gadget *_gadget)
{
	return ((UFNRH & 0x07) << 8) | (UFNRL & 0xff);
}

static int pxa25x_udc_wakeup(struct usb_gadget *_gadget)
{
	/* host may not have enabled remote wakeup */
	if ((UDCCS0 & UDCCS0_DRWF) == 0)
		return -EHOSTUNREACH;
	udc_set_mask_UDCCR(UDCCR_RSM);
	return 0;
}

static void stop_activity(struct pxa25x_udc *, struct usb_gadget_driver *);
static void udc_enable (struct pxa25x_udc *);
static void udc_disable(struct pxa25x_udc *);

/* We disable the UDC -- and its 48 MHz clock -- whenever it's not
 * in active use.
 */
static int pullup(struct pxa25x_udc *udc)
{
	int is_active = udc->vbus && udc->pullup && !udc->suspended;
	DMSG("%s\n", is_active ? "active" : "inactive");
	if (is_active) {
		if (!udc->active) {
			udc->active = 1;
			/* Enable clock for USB device */
			clk_enable(udc->clk);
			udc_enable(udc);
		}
	} else {
		if (udc->active) {
			if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
				DMSG("disconnect %s\n", udc->driver
					? udc->driver->driver.name
					: "(no driver)");
				stop_activity(udc, udc->driver);
			}
			udc_disable(udc);
			/* Disable clock for USB device */
			clk_disable(udc->clk);
			udc->active = 0;
		}

	}
	return 0;
}

/* VBUS reporting logically comes from a transceiver */
static int pxa25x_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
{
	struct pxa25x_udc	*udc;

	udc = container_of(_gadget, struct pxa25x_udc, gadget);
	udc->vbus = is_active;
	DMSG("vbus %s\n", is_active ? "supplied" : "inactive");
	pullup(udc);
	return 0;
}

/* drivers may have software control over D+ pullup */
static int pxa25x_udc_pullup(struct usb_gadget *_gadget, int is_active)
{
	struct pxa25x_udc	*udc;

	udc = container_of(_gadget, struct pxa25x_udc, gadget);

	/* not all boards support pullup control */
	if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command)
		return -EOPNOTSUPP;

	udc->pullup = (is_active != 0);
	pullup(udc);
	return 0;
}

/* boards may consume current from VBUS, up to 100-500mA based on config.
 * the 500uA suspend ceiling means that exclusively vbus-powered PXA designs
 * violate USB specs.
 */
static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
{
	struct pxa25x_udc	*udc;

	udc = container_of(_gadget, struct pxa25x_udc, gadget);

	if (udc->transceiver)
		return otg_set_power(udc->transceiver, mA);
	return -EOPNOTSUPP;
}

static const struct usb_gadget_ops pxa25x_udc_ops = {
	.get_frame	= pxa25x_udc_get_frame,
	.wakeup		= pxa25x_udc_wakeup,
	.vbus_session	= pxa25x_udc_vbus_session,
	.pullup		= pxa25x_udc_pullup,
	.vbus_draw	= pxa25x_udc_vbus_draw,
};

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

#ifdef CONFIG_USB_GADGET_DEBUG_FS

static int
udc_seq_show(struct seq_file *m, void *_d)
{
	struct pxa25x_udc	*dev = m->private;
	unsigned long		flags;
	int			i;
	u32			tmp;

	local_irq_save(flags);

	/* basic device status */
	seq_printf(m, DRIVER_DESC "\n"
		"%s version: %s\nGadget driver: %s\nHost %s\n\n",
		driver_name, DRIVER_VERSION SIZE_STR "(pio)",
		dev->driver ? dev->driver->driver.name : "(none)",
		dev->gadget.speed == USB_SPEED_FULL ? "full speed" : "disconnected");

	/* registers for device and ep0 */
	seq_printf(m,
		"uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
		UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);

	tmp = UDCCR;
	seq_printf(m,
		"udccr %02X =%s%s%s%s%s%s%s%s\n", tmp,
		(tmp & UDCCR_REM) ? " rem" : "",
		(tmp & UDCCR_RSTIR) ? " rstir" : "",
		(tmp & UDCCR_SRM) ? " srm" : "",
		(tmp & UDCCR_SUSIR) ? " susir" : "",
		(tmp & UDCCR_RESIR) ? " resir" : "",
		(tmp & UDCCR_RSM) ? " rsm" : "",
		(tmp & UDCCR_UDA) ? " uda" : "",
		(tmp & UDCCR_UDE) ? " ude" : "");

	tmp = UDCCS0;
	seq_printf(m,
		"udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp,
		(tmp & UDCCS0_SA) ? " sa" : "",
		(tmp & UDCCS0_RNE) ? " rne" : "",
		(tmp & UDCCS0_FST) ? " fst" : "",
		(tmp & UDCCS0_SST) ? " sst" : "",
		(tmp & UDCCS0_DRWF) ? " dwrf" : "",
		(tmp & UDCCS0_FTF) ? " ftf" : "",
		(tmp & UDCCS0_IPR) ? " ipr" : "",
		(tmp & UDCCS0_OPR) ? " opr" : "");

	if (dev->has_cfr) {
		tmp = UDCCFR;
		seq_printf(m,
			"udccfr %02X =%s%s\n", tmp,
			(tmp & UDCCFR_AREN) ? " aren" : "",
			(tmp & UDCCFR_ACM) ? " acm" : "");
	}

	if (dev->gadget.speed != USB_SPEED_FULL || !dev->driver)
		goto done;

	seq_printf(m, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
		dev->stats.write.bytes, dev->stats.write.ops,
		dev->stats.read.bytes, dev->stats.read.ops,
		dev->stats.irqs);

	/* dump endpoint queues */
	for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
		struct pxa25x_ep	*ep = &dev->ep [i];
		struct pxa25x_request	*req;

		if (i != 0) {
			const struct usb_endpoint_descriptor	*desc;

			desc = ep->desc;
			if (!desc)
				continue;
			tmp = *dev->ep [i].reg_udccs;
			seq_printf(m,
				"%s max %d %s udccs %02x irqs %lu\n",
				ep->ep.name, le16_to_cpu(desc->wMaxPacketSize),
				"pio", tmp, ep->pio_irqs);
			/* TODO translate all five groups of udccs bits! */

		} else /* ep0 should only have one transfer queued */
			seq_printf(m, "ep0 max 16 pio irqs %lu\n",
				ep->pio_irqs);

		if (list_empty(&ep->queue)) {
			seq_printf(m, "\t(nothing queued)\n");
			continue;
		}
		list_for_each_entry(req, &ep->queue, queue) {
			seq_printf(m,
					"\treq %p len %d/%d buf %p\n",
					&req->req, req->req.actual,
					req->req.length, req->req.buf);
		}
	}

done:
	local_irq_restore(flags);
	return 0;
}

static int
udc_debugfs_open(struct inode *inode, struct file *file)
{
	return single_open(file, udc_seq_show, inode->i_private);
}

static const struct file_operations debug_fops = {
	.open		= udc_debugfs_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.owner		= THIS_MODULE,
};

#define create_debug_files(dev) \
	do { \
		dev->debugfs_udc = debugfs_create_file(dev->gadget.name, \
			S_IRUGO, NULL, dev, &debug_fops); \
	} while (0)
#define remove_debug_files(dev) \
	do { \
		if (dev->debugfs_udc) \
			debugfs_remove(dev->debugfs_udc); \
	} while (0)

#else	/* !CONFIG_USB_GADGET_DEBUG_FILES */

#define create_debug_files(dev) do {} while (0)
#define remove_debug_files(dev) do {} while (0)

#endif	/* CONFIG_USB_GADGET_DEBUG_FILES */

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

/*
 *	udc_disable - disable USB device controller
 */
static void udc_disable(struct pxa25x_udc *dev)
{
	/* block all irqs */
	udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
	UICR0 = UICR1 = 0xff;
	UFNRH = UFNRH_SIM;

	/* if hardware supports it, disconnect from usb */
	pullup_off();

	udc_clear_mask_UDCCR(UDCCR_UDE);

	ep0_idle (dev);
	dev->gadget.speed = USB_SPEED_UNKNOWN;
}


/*
 *	udc_reinit - initialize software state
 */
static void udc_reinit(struct pxa25x_udc *dev)
{
	u32	i;

	/* device/ep0 records init */
	INIT_LIST_HEAD (&dev->gadget.ep_list);
	INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
	dev->ep0state = EP0_IDLE;

	/* basic endpoint records init */
	for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
		struct pxa25x_ep *ep = &dev->ep[i];

		if (i != 0)
			list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);

		ep->desc = NULL;
		ep->stopped = 0;
		INIT_LIST_HEAD (&ep->queue);
		ep->pio_irqs = 0;
	}

	/* the rest was statically initialized, and is read-only */
}

/* until it's enabled, this UDC should be completely invisible
 * to any USB host.
 */
static void udc_enable (struct pxa25x_udc *dev)
{
	udc_clear_mask_UDCCR(UDCCR_UDE);

	/* try to clear these bits before we enable the udc */
	udc_ack_int_UDCCR(UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR);

	ep0_idle(dev);
	dev->gadget.speed = USB_SPEED_UNKNOWN;
	dev->stats.irqs = 0;

	/*
	 * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
	 * - enable UDC
	 * - if RESET is already in progress, ack interrupt
	 * - unmask reset interrupt
	 */
	udc_set_mask_UDCCR(UDCCR_UDE);
	if (!(UDCCR & UDCCR_UDA))
		udc_ack_int_UDCCR(UDCCR_RSTIR);

	if (dev->has_cfr /* UDC_RES2 is defined */) {
		/* pxa255 (a0+) can avoid a set_config race that could
		 * prevent gadget drivers from configuring correctly
		 */
		UDCCFR = UDCCFR_ACM | UDCCFR_MB1;
	} else {
		/* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1)
		 * which could result in missing packets and interrupts.
		 * supposedly one bit per endpoint, controlling whether it
		 * double buffers or not; ACM/AREN bits fit into the holes.
		 * zero bits (like USIR0_IRx) disable double buffering.
		 */
		UDC_RES1 = 0x00;
		UDC_RES2 = 0x00;
	}

	/* enable suspend/resume and reset irqs */
	udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);

	/* enable ep0 irqs */
	UICR0 &= ~UICR0_IM0;

	/* if hardware supports it, pullup D+ and wait for reset */
	pullup_on();
}


/* when a driver is successfully registered, it will receive
 * control requests including set_configuration(), which enables
 * non-control requests.  then usb traffic follows until a
 * disconnect is reported.  then a host may connect again, or
 * the driver might get unbound.
 */
int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
		int (*bind)(struct usb_gadget *))
{
	struct pxa25x_udc	*dev = the_controller;
	int			retval;

	if (!driver
			|| driver->speed < USB_SPEED_FULL
			|| !bind
			|| !driver->disconnect
			|| !driver->setup)
		return -EINVAL;
	if (!dev)
		return -ENODEV;
	if (dev->driver)
		return -EBUSY;

	/* first hook up the driver ... */
	dev->driver = driver;
	dev->gadget.dev.driver = &driver->driver;
	dev->pullup = 1;

	retval = device_add (&dev->gadget.dev);
	if (retval) {
fail:
		dev->driver = NULL;
		dev->gadget.dev.driver = NULL;
		return retval;
	}
	retval = bind(&dev->gadget);
	if (retval) {
		DMSG("bind to driver %s --> error %d\n",
				driver->driver.name, retval);
		device_del (&dev->gadget.dev);
		goto fail;
	}

	/* ... then enable host detection and ep0; and we're ready
	 * for set_configuration as well as eventual disconnect.
	 */
	DMSG("registered gadget driver '%s'\n", driver->driver.name);

	/* connect to bus through transceiver */
	if (dev->transceiver) {
		retval = otg_set_peripheral(dev->transceiver, &dev->gadget);
		if (retval) {
			DMSG("can't bind to transceiver\n");
			if (driver->unbind)
				driver->unbind(&dev->gadget);
			goto bind_fail;
		}
	}

	pullup(dev);
	dump_state(dev);
	return 0;
bind_fail:
	return retval;
}
EXPORT_SYMBOL(usb_gadget_probe_driver);

static void
stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver)
{
	int i;

	/* don't disconnect drivers more than once */
	if (dev->gadget.speed == USB_SPEED_UNKNOWN)
		driver = NULL;
	dev->gadget.speed = USB_SPEED_UNKNOWN;

	/* prevent new request submissions, kill any outstanding requests  */
	for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
		struct pxa25x_ep *ep = &dev->ep[i];

		ep->stopped = 1;
		nuke(ep, -ESHUTDOWN);
	}
	del_timer_sync(&dev->timer);

	/* report disconnect; the driver is already quiesced */
	if (driver)
		driver->disconnect(&dev->gadget);

	/* re-init driver-visible data structures */
	udc_reinit(dev);
}

int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
	struct pxa25x_udc	*dev = the_controller;

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

	local_irq_disable();
	dev->pullup = 0;
	pullup(dev);
	stop_activity(dev, driver);
	local_irq_enable();

	if (dev->transceiver)
		(void) otg_set_peripheral(dev->transceiver, NULL);

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

	device_del (&dev->gadget.dev);

	DMSG("unregistered gadget driver '%s'\n", driver->driver.name);
	dump_state(dev);
	return 0;
}
EXPORT_SYMBOL(usb_gadget_unregister_driver);


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

#ifdef CONFIG_ARCH_LUBBOCK

/* Lubbock has separate connect and disconnect irqs.  More typical designs
 * use one GPIO as the VBUS IRQ, and another to control the D+ pullup.
 */

static irqreturn_t
lubbock_vbus_irq(int irq, void *_dev)
{
	struct pxa25x_udc	*dev = _dev;
	int			vbus;

	dev->stats.irqs++;
	switch (irq) {
	case LUBBOCK_USB_IRQ:
		vbus = 1;
		disable_irq(LUBBOCK_USB_IRQ);
		enable_irq(LUBBOCK_USB_DISC_IRQ);
		break;
	case LUBBOCK_USB_DISC_IRQ:
		vbus = 0;
		disable_irq(LUBBOCK_USB_DISC_IRQ);
		enable_irq(LUBBOCK_USB_IRQ);
		break;
	default:
		return IRQ_NONE;
	}

	pxa25x_udc_vbus_session(&dev->gadget, vbus);
	return IRQ_HANDLED;
}

#endif


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

static inline void clear_ep_state (struct pxa25x_udc *dev)
{
	unsigned i;

	/* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
	 * fifos, and pending transactions mustn't be continued in any case.
	 */
	for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
		nuke(&dev->ep[i], -ECONNABORTED);
}

static void udc_watchdog(unsigned long _dev)
{
	struct pxa25x_udc	*dev = (void *)_dev;

	local_irq_disable();
	if (dev->ep0state == EP0_STALL
			&& (UDCCS0 & UDCCS0_FST) == 0
			&& (UDCCS0 & UDCCS0_SST) == 0) {
		UDCCS0 = UDCCS0_FST|UDCCS0_FTF;
		DBG(DBG_VERBOSE, "ep0 re-stall\n");
		start_watchdog(dev);
	}
	local_irq_enable();
}

static void handle_ep0 (struct pxa25x_udc *dev)
{
	u32			udccs0 = UDCCS0;
	struct pxa25x_ep	*ep = &dev->ep [0];
	struct pxa25x_request	*req;
	union {
		struct usb_ctrlrequest	r;
		u8			raw [8];
		u32			word [2];
	} u;

	if (list_empty(&ep->queue))
		req = NULL;
	else
		req = list_entry(ep->queue.next, struct pxa25x_request, queue);

	/* clear stall status */
	if (udccs0 & UDCCS0_SST) {
		nuke(ep, -EPIPE);
		UDCCS0 = UDCCS0_SST;
		del_timer(&dev->timer);
		ep0_idle(dev);
	}

	/* previous request unfinished?  non-error iff back-to-back ... */
	if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
		nuke(ep, 0);
		del_timer(&dev->timer);
		ep0_idle(dev);
	}

	switch (dev->ep0state) {
	case EP0_IDLE:
		/* late-breaking status? */
		udccs0 = UDCCS0;

		/* start control request? */
		if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
				== (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
			int i;

			nuke (ep, -EPROTO);

			/* read SETUP packet */
			for (i = 0; i < 8; i++) {
				if (unlikely(!(UDCCS0 & UDCCS0_RNE))) {
bad_setup:
					DMSG("SETUP %d!\n", i);
					goto stall;
				}
				u.raw [i] = (u8) UDDR0;
			}
			if (unlikely((UDCCS0 & UDCCS0_RNE) != 0))
				goto bad_setup;

got_setup:
			DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n",
				u.r.bRequestType, u.r.bRequest,
				le16_to_cpu(u.r.wValue),
				le16_to_cpu(u.r.wIndex),
				le16_to_cpu(u.r.wLength));

			/* cope with automagic for some standard requests. */
			dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
						== USB_TYPE_STANDARD;
			dev->req_config = 0;
			dev->req_pending = 1;
			switch (u.r.bRequest) {
			/* hardware restricts gadget drivers here! */
			case USB_REQ_SET_CONFIGURATION:
				if (u.r.bRequestType == USB_RECIP_DEVICE) {
					/* reflect hardware's automagic
					 * up to the gadget driver.
					 */
config_change:
					dev->req_config = 1;
					clear_ep_state(dev);
					/* if !has_cfr, there's no synch
					 * else use AREN (later) not SA|OPR
					 * USIR0_IR0 acts edge sensitive
					 */
				}
				break;
			/* ... and here, even more ... */
			case USB_REQ_SET_INTERFACE:
				if (u.r.bRequestType == USB_RECIP_INTERFACE) {
					/* udc hardware is broken by design:
					 *  - altsetting may only be zero;
					 *  - hw resets all interfaces' eps;
					 *  - ep reset doesn't include halt(?).
					 */
					DMSG("broken set_interface (%d/%d)\n",
						le16_to_cpu(u.r.wIndex),
						le16_to_cpu(u.r.wValue));
					goto config_change;
				}
				break;
			/* hardware was supposed to hide this */
			case USB_REQ_SET_ADDRESS:
				if (u.r.bRequestType == USB_RECIP_DEVICE) {
					ep0start(dev, 0, "address");
					return;
				}
				break;
			}

			if (u.r.bRequestType & USB_DIR_IN)
				dev->ep0state = EP0_IN_DATA_PHASE;
			else
				dev->ep0state = EP0_OUT_DATA_PHASE;

			i = dev->driver->setup(&dev->gadget, &u.r);
			if (i < 0) {
				/* hardware automagic preventing STALL... */
				if (dev->req_config) {
					/* hardware sometimes neglects to tell
					 * tell us about config change events,
					 * so later ones may fail...
					 */
					WARNING("config change %02x fail %d?\n",
						u.r.bRequest, i);
					return;
					/* TODO experiment:  if has_cfr,
					 * hardware didn't ACK; maybe we
					 * could actually STALL!
					 */
				}
				DBG(DBG_VERBOSE, "protocol STALL, "
					"%02x err %d\n", UDCCS0, i);
stall:
				/* the watchdog timer helps deal with cases
				 * where udc seems to clear FST wrongly, and
				 * then NAKs instead of STALLing.
				 */
				ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
				start_watchdog(dev);
				dev->ep0state = EP0_STALL;

			/* deferred i/o == no response yet */
			} else if (dev->req_pending) {
				if (likely(dev->ep0state == EP0_IN_DATA_PHASE
						|| dev->req_std || u.r.wLength))
					ep0start(dev, 0, "defer");
				else
					ep0start(dev, UDCCS0_IPR, "defer/IPR");
			}

			/* expect at least one data or status stage irq */
			return;

		} else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
				== (UDCCS0_OPR|UDCCS0_SA))) {
			unsigned i;

			/* pxa210/250 erratum 131 for B0/B1 says RNE lies.
			 * still observed on a pxa255 a0.
			 */
			DBG(DBG_VERBOSE, "e131\n");
			nuke(ep, -EPROTO);

			/* read SETUP data, but don't trust it too much */
			for (i = 0; i < 8; i++)
				u.raw [i] = (u8) UDDR0;
			if ((u.r.bRequestType & USB_RECIP_MASK)
					> USB_RECIP_OTHER)
				goto stall;
			if (u.word [0] == 0 && u.word [1] == 0)
				goto stall;
			goto got_setup;
		} else {
			/* some random early IRQ:
			 * - we acked FST
			 * - IPR cleared
			 * - OPR got set, without SA (likely status stage)
			 */
			UDCCS0 = udccs0 & (UDCCS0_SA|UDCCS0_OPR);
		}
		break;
	case EP0_IN_DATA_PHASE:			/* GET_DESCRIPTOR etc */
		if (udccs0 & UDCCS0_OPR) {
			UDCCS0 = UDCCS0_OPR|UDCCS0_FTF;
			DBG(DBG_VERBOSE, "ep0in premature status\n");
			if (req)
				done(ep, req, 0);
			ep0_idle(dev);
		} else /* irq was IPR clearing */ {
			if (req) {
				/* this IN packet might finish the request */
				(void) write_ep0_fifo(ep, req);
			} /* else IN token before response was written */
		}
		break;
	case EP0_OUT_DATA_PHASE:		/* SET_DESCRIPTOR etc */
		if (udccs0 & UDCCS0_OPR) {
			if (req) {
				/* this OUT packet might finish the request */
				if (read_ep0_fifo(ep, req))
					done(ep, req, 0);
				/* else more OUT packets expected */
			} /* else OUT token before read was issued */
		} else /* irq was IPR clearing */ {
			DBG(DBG_VERBOSE, "ep0out premature status\n");
			if (req)
				done(ep, req, 0);
			ep0_idle(dev);
		}
		break;
	case EP0_END_XFER:
		if (req)
			done(ep, req, 0);
		/* ack control-IN status (maybe in-zlp was skipped)
		 * also appears after some config change events.
		 */
		if (udccs0 & UDCCS0_OPR)
			UDCCS0 = UDCCS0_OPR;
		ep0_idle(dev);
		break;
	case EP0_STALL:
		UDCCS0 = UDCCS0_FST;
		break;
	}
	USIR0 = USIR0_IR0;
}

static void handle_ep(struct pxa25x_ep *ep)
{
	struct pxa25x_request	*req;
	int			is_in = ep->bEndpointAddress & USB_DIR_IN;
	int			completed;
	u32			udccs, tmp;

	do {
		completed = 0;
		if (likely (!list_empty(&ep->queue)))
			req = list_entry(ep->queue.next,
					struct pxa25x_request, queue);
		else
			req = NULL;

		// TODO check FST handling

		udccs = *ep->reg_udccs;
		if (unlikely(is_in)) {	/* irq from TPC, SST, or (ISO) TUR */
			tmp = UDCCS_BI_TUR;
			if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
				tmp |= UDCCS_BI_SST;
			tmp &= udccs;
			if (likely (tmp))
				*ep->reg_udccs = tmp;
			if (req && likely ((udccs & UDCCS_BI_TFS) != 0))
				completed = write_fifo(ep, req);

		} else {	/* irq from RPC (or for ISO, ROF) */
			if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
				tmp = UDCCS_BO_SST | UDCCS_BO_DME;
			else
				tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
			tmp &= udccs;
			if (likely(tmp))
				*ep->reg_udccs = tmp;

			/* fifos can hold packets, ready for reading... */
			if (likely(req)) {
				completed = read_fifo(ep, req);
			} else
				pio_irq_disable (ep->bEndpointAddress);
		}
		ep->pio_irqs++;
	} while (completed);
}

/*
 *	pxa25x_udc_irq - interrupt handler
 *
 * avoid delays in ep0 processing. the control handshaking isn't always
 * under software control (pxa250c0 and the pxa255 are better), and delays
 * could cause usb protocol errors.
 */
static irqreturn_t
pxa25x_udc_irq(int irq, void *_dev)
{
	struct pxa25x_udc	*dev = _dev;
	int			handled;

	dev->stats.irqs++;
	do {
		u32		udccr = UDCCR;

		handled = 0;

		/* SUSpend Interrupt Request */
		if (unlikely(udccr & UDCCR_SUSIR)) {
			udc_ack_int_UDCCR(UDCCR_SUSIR);
			handled = 1;
			DBG(DBG_VERBOSE, "USB suspend\n");

			if (dev->gadget.speed != USB_SPEED_UNKNOWN
					&& dev->driver
					&& dev->driver->suspend)
				dev->driver->suspend(&dev->gadget);
			ep0_idle (dev);
		}

		/* RESume Interrupt Request */
		if (unlikely(udccr & UDCCR_RESIR)) {
			udc_ack_int_UDCCR(UDCCR_RESIR);
			handled = 1;
			DBG(DBG_VERBOSE, "USB resume\n");

			if (dev->gadget.speed != USB_SPEED_UNKNOWN
					&& dev->driver
					&& dev->driver->resume)
				dev->driver->resume(&dev->gadget);
		}

		/* ReSeT Interrupt Request - USB reset */
		if (unlikely(udccr & UDCCR_RSTIR)) {
			udc_ack_int_UDCCR(UDCCR_RSTIR);
			handled = 1;

			if ((UDCCR & UDCCR_UDA) == 0) {
				DBG(DBG_VERBOSE, "USB reset start\n");

				/* reset driver and endpoints,
				 * in case that's not yet done
				 */
				stop_activity (dev, dev->driver);

			} else {
				DBG(DBG_VERBOSE, "USB reset end\n");
				dev->gadget.speed = USB_SPEED_FULL;
				memset(&dev->stats, 0, sizeof dev->stats);
				/* driver and endpoints are still reset */
			}

		} else {
			u32	usir0 = USIR0 & ~UICR0;
			u32	usir1 = USIR1 & ~UICR1;
			int	i;

			if (unlikely (!usir0 && !usir1))
				continue;

			DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0);

			/* control traffic */
			if (usir0 & USIR0_IR0) {
				dev->ep[0].pio_irqs++;
				handle_ep0(dev);
				handled = 1;
			}

			/* endpoint data transfers */
			for (i = 0; i < 8; i++) {
				u32	tmp = 1 << i;

				if (i && (usir0 & tmp)) {
					handle_ep(&dev->ep[i]);
					USIR0 |= tmp;
					handled = 1;
				}
#ifndef	CONFIG_USB_PXA25X_SMALL
				if (usir1 & tmp) {
					handle_ep(&dev->ep[i+8]);
					USIR1 |= tmp;
					handled = 1;
				}
#endif
			}
		}

		/* we could also ask for 1 msec SOF (SIR) interrupts */

	} while (handled);
	return IRQ_HANDLED;
}

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

static void nop_release (struct device *dev)
{
	DMSG("%s %s\n", __func__, dev_name(dev));
}

/* this uses load-time allocation and initialization (instead of
 * doing it at run-time) to save code, eliminate fault paths, and
 * be more obviously correct.
 */
static struct pxa25x_udc memory = {
	.gadget = {
		.ops		= &pxa25x_udc_ops,
		.ep0		= &memory.ep[0].ep,
		.name		= driver_name,
		.dev = {
			.init_name	= "gadget",
			.release	= nop_release,
		},
	},

	/* control endpoint */
	.ep[0] = {
		.ep = {
			.name		= ep0name,
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= EP0_FIFO_SIZE,
		},
		.dev		= &memory,
		.reg_udccs	= &UDCCS0,
		.reg_uddr	= &UDDR0,
	},

	/* first group of endpoints */
	.ep[1] = {
		.ep = {
			.name		= "ep1in-bulk",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= BULK_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= BULK_FIFO_SIZE,
		.bEndpointAddress = USB_DIR_IN | 1,
		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
		.reg_udccs	= &UDCCS1,
		.reg_uddr	= &UDDR1,
	},
	.ep[2] = {
		.ep = {
			.name		= "ep2out-bulk",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= BULK_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= BULK_FIFO_SIZE,
		.bEndpointAddress = 2,
		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
		.reg_udccs	= &UDCCS2,
		.reg_ubcr	= &UBCR2,
		.reg_uddr	= &UDDR2,
	},
#ifndef CONFIG_USB_PXA25X_SMALL
	.ep[3] = {
		.ep = {
			.name		= "ep3in-iso",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= ISO_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= ISO_FIFO_SIZE,
		.bEndpointAddress = USB_DIR_IN | 3,
		.bmAttributes	= USB_ENDPOINT_XFER_ISOC,
		.reg_udccs	= &UDCCS3,
		.reg_uddr	= &UDDR3,
	},
	.ep[4] = {
		.ep = {
			.name		= "ep4out-iso",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= ISO_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= ISO_FIFO_SIZE,
		.bEndpointAddress = 4,
		.bmAttributes	= USB_ENDPOINT_XFER_ISOC,
		.reg_udccs	= &UDCCS4,
		.reg_ubcr	= &UBCR4,
		.reg_uddr	= &UDDR4,
	},
	.ep[5] = {
		.ep = {
			.name		= "ep5in-int",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= INT_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= INT_FIFO_SIZE,
		.bEndpointAddress = USB_DIR_IN | 5,
		.bmAttributes	= USB_ENDPOINT_XFER_INT,
		.reg_udccs	= &UDCCS5,
		.reg_uddr	= &UDDR5,
	},

	/* second group of endpoints */
	.ep[6] = {
		.ep = {
			.name		= "ep6in-bulk",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= BULK_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= BULK_FIFO_SIZE,
		.bEndpointAddress = USB_DIR_IN | 6,
		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
		.reg_udccs	= &UDCCS6,
		.reg_uddr	= &UDDR6,
	},
	.ep[7] = {
		.ep = {
			.name		= "ep7out-bulk",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= BULK_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= BULK_FIFO_SIZE,
		.bEndpointAddress = 7,
		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
		.reg_udccs	= &UDCCS7,
		.reg_ubcr	= &UBCR7,
		.reg_uddr	= &UDDR7,
	},
	.ep[8] = {
		.ep = {
			.name		= "ep8in-iso",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= ISO_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= ISO_FIFO_SIZE,
		.bEndpointAddress = USB_DIR_IN | 8,
		.bmAttributes	= USB_ENDPOINT_XFER_ISOC,
		.reg_udccs	= &UDCCS8,
		.reg_uddr	= &UDDR8,
	},
	.ep[9] = {
		.ep = {
			.name		= "ep9out-iso",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= ISO_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= ISO_FIFO_SIZE,
		.bEndpointAddress = 9,
		.bmAttributes	= USB_ENDPOINT_XFER_ISOC,
		.reg_udccs	= &UDCCS9,
		.reg_ubcr	= &UBCR9,
		.reg_uddr	= &UDDR9,
	},
	.ep[10] = {
		.ep = {
			.name		= "ep10in-int",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= INT_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= INT_FIFO_SIZE,
		.bEndpointAddress = USB_DIR_IN | 10,
		.bmAttributes	= USB_ENDPOINT_XFER_INT,
		.reg_udccs	= &UDCCS10,
		.reg_uddr	= &UDDR10,
	},

	/* third group of endpoints */
	.ep[11] = {
		.ep = {
			.name		= "ep11in-bulk",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= BULK_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= BULK_FIFO_SIZE,
		.bEndpointAddress = USB_DIR_IN | 11,
		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
		.reg_udccs	= &UDCCS11,
		.reg_uddr	= &UDDR11,
	},
	.ep[12] = {
		.ep = {
			.name		= "ep12out-bulk",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= BULK_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= BULK_FIFO_SIZE,
		.bEndpointAddress = 12,
		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
		.reg_udccs	= &UDCCS12,
		.reg_ubcr	= &UBCR12,
		.reg_uddr	= &UDDR12,
	},
	.ep[13] = {
		.ep = {
			.name		= "ep13in-iso",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= ISO_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= ISO_FIFO_SIZE,
		.bEndpointAddress = USB_DIR_IN | 13,
		.bmAttributes	= USB_ENDPOINT_XFER_ISOC,
		.reg_udccs	= &UDCCS13,
		.reg_uddr	= &UDDR13,
	},
	.ep[14] = {
		.ep = {
			.name		= "ep14out-iso",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= ISO_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= ISO_FIFO_SIZE,
		.bEndpointAddress = 14,
		.bmAttributes	= USB_ENDPOINT_XFER_ISOC,
		.reg_udccs	= &UDCCS14,
		.reg_ubcr	= &UBCR14,
		.reg_uddr	= &UDDR14,
	},
	.ep[15] = {
		.ep = {
			.name		= "ep15in-int",
			.ops		= &pxa25x_ep_ops,
			.maxpacket	= INT_FIFO_SIZE,
		},
		.dev		= &memory,
		.fifo_size	= INT_FIFO_SIZE,
		.bEndpointAddress = USB_DIR_IN | 15,
		.bmAttributes	= USB_ENDPOINT_XFER_INT,
		.reg_udccs	= &UDCCS15,
		.reg_uddr	= &UDDR15,
	},
#endif /* !CONFIG_USB_PXA25X_SMALL */
};

#define CP15R0_VENDOR_MASK	0xffffe000

#if	defined(CONFIG_ARCH_PXA)
#define CP15R0_XSCALE_VALUE	0x69052000	/* intel/arm/xscale */

#elif	defined(CONFIG_ARCH_IXP4XX)
#define CP15R0_XSCALE_VALUE	0x69054000	/* intel/arm/ixp4xx */

#endif

#define CP15R0_PROD_MASK	0x000003f0
#define PXA25x			0x00000100	/* and PXA26x */
#define PXA210			0x00000120

#define CP15R0_REV_MASK		0x0000000f

#define CP15R0_PRODREV_MASK	(CP15R0_PROD_MASK | CP15R0_REV_MASK)

#define PXA255_A0		0x00000106	/* or PXA260_B1 */
#define PXA250_C0		0x00000105	/* or PXA26x_B0 */
#define PXA250_B2		0x00000104
#define PXA250_B1		0x00000103	/* or PXA260_A0 */
#define PXA250_B0		0x00000102
#define PXA250_A1		0x00000101
#define PXA250_A0		0x00000100

#define PXA210_C0		0x00000125
#define PXA210_B2		0x00000124
#define PXA210_B1		0x00000123
#define PXA210_B0		0x00000122
#define IXP425_A0		0x000001c1
#define IXP425_B0		0x000001f1
#define IXP465_AD		0x00000200

/*
 *	probe - binds to the platform device
 */
static int __init pxa25x_udc_probe(struct platform_device *pdev)
{
	struct pxa25x_udc *dev = &memory;
	int retval, irq;
	u32 chiprev;

	/* insist on Intel/ARM/XScale */
	asm("mrc%? p15, 0, %0, c0, c0" : "=r" (chiprev));
	if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) {
		pr_err("%s: not XScale!\n", driver_name);
		return -ENODEV;
	}

	/* trigger chiprev-specific logic */
	switch (chiprev & CP15R0_PRODREV_MASK) {
#if	defined(CONFIG_ARCH_PXA)
	case PXA255_A0:
		dev->has_cfr = 1;
		break;
	case PXA250_A0:
	case PXA250_A1:
		/* A0/A1 "not released"; ep 13, 15 unusable */
		/* fall through */
	case PXA250_B2: case PXA210_B2:
	case PXA250_B1: case PXA210_B1:
	case PXA250_B0: case PXA210_B0:
		/* OUT-DMA is broken ... */
		/* fall through */
	case PXA250_C0: case PXA210_C0:
		break;
#elif	defined(CONFIG_ARCH_IXP4XX)
	case IXP425_A0:
	case IXP425_B0:
	case IXP465_AD:
		dev->has_cfr = 1;
		break;
#endif
	default:
		pr_err("%s: unrecognized processor: %08x\n",
			driver_name, chiprev);
		/* iop3xx, ixp4xx, ... */
		return -ENODEV;
	}

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

	dev->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(dev->clk)) {
		retval = PTR_ERR(dev->clk);
		goto err_clk;
	}

	pr_debug("%s: IRQ %d%s%s\n", driver_name, irq,
		dev->has_cfr ? "" : " (!cfr)",
		SIZE_STR "(pio)"
		);

	/* other non-static parts of init */
	dev->dev = &pdev->dev;
	dev->mach = pdev->dev.platform_data;

	dev->transceiver = otg_get_transceiver();

	if (gpio_is_valid(dev->mach->gpio_pullup)) {
		if ((retval = gpio_request(dev->mach->gpio_pullup,
				"pca25x_udc GPIO PULLUP"))) {
			dev_dbg(&pdev->dev,
				"can't get pullup gpio %d, err: %d\n",
				dev->mach->gpio_pullup, retval);
			goto err_gpio_pullup;
		}
		gpio_direction_output(dev->mach->gpio_pullup, 0);
	}

	init_timer(&dev->timer);
	dev->timer.function = udc_watchdog;
	dev->timer.data = (unsigned long) dev;

	device_initialize(&dev->gadget.dev);
	dev->gadget.dev.parent = &pdev->dev;
	dev->gadget.dev.dma_mask = pdev->dev.dma_mask;

	the_controller = dev;
	platform_set_drvdata(pdev, dev);

	udc_disable(dev);
	udc_reinit(dev);

	dev->vbus = 0;

	/* irq setup after old hardware state is cleaned up */
	retval = request_irq(irq, pxa25x_udc_irq,
			IRQF_DISABLED, driver_name, dev);
	if (retval != 0) {
		pr_err("%s: can't get irq %d, err %d\n",
			driver_name, irq, retval);
		goto err_irq1;
	}
	dev->got_irq = 1;

#ifdef CONFIG_ARCH_LUBBOCK
	if (machine_is_lubbock()) {
		retval = request_irq(LUBBOCK_USB_DISC_IRQ,
				lubbock_vbus_irq,
				IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
				driver_name, dev);
		if (retval != 0) {
			pr_err("%s: can't get irq %i, err %d\n",
				driver_name, LUBBOCK_USB_DISC_IRQ, retval);
lubbock_fail0:
			goto err_irq_lub;
		}
		retval = request_irq(LUBBOCK_USB_IRQ,
				lubbock_vbus_irq,
				IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
				driver_name, dev);
		if (retval != 0) {
			pr_err("%s: can't get irq %i, err %d\n",
				driver_name, LUBBOCK_USB_IRQ, retval);
			free_irq(LUBBOCK_USB_DISC_IRQ, dev);
			goto lubbock_fail0;
		}
	} else
#endif
	create_debug_files(dev);

	return 0;

#ifdef	CONFIG_ARCH_LUBBOCK
	free_irq(LUBBOCK_USB_DISC_IRQ, dev);
 err_irq_lub:
#endif
	free_irq(irq, dev);
 err_irq1:
	if (gpio_is_valid(dev->mach->gpio_pullup))
		gpio_free(dev->mach->gpio_pullup);
 err_gpio_pullup:
	if (dev->transceiver) {
		otg_put_transceiver(dev->transceiver);
		dev->transceiver = NULL;
	}
	clk_put(dev->clk);
 err_clk:
	return retval;
}

static void pxa25x_udc_shutdown(struct platform_device *_dev)
{
	pullup_off();
}

static int __exit pxa25x_udc_remove(struct platform_device *pdev)
{
	struct pxa25x_udc *dev = platform_get_drvdata(pdev);

	if (dev->driver)
		return -EBUSY;

	dev->pullup = 0;
	pullup(dev);

	remove_debug_files(dev);

	if (dev->got_irq) {
		free_irq(platform_get_irq(pdev, 0), dev);
		dev->got_irq = 0;
	}
#ifdef CONFIG_ARCH_LUBBOCK
	if (machine_is_lubbock()) {
		free_irq(LUBBOCK_USB_DISC_IRQ, dev);
		free_irq(LUBBOCK_USB_IRQ, dev);
	}
#endif
	if (gpio_is_valid(dev->mach->gpio_pullup))
		gpio_free(dev->mach->gpio_pullup);

	clk_put(dev->clk);

	if (dev->transceiver) {
		otg_put_transceiver(dev->transceiver);
		dev->transceiver = NULL;
	}

	platform_set_drvdata(pdev, NULL);
	the_controller = NULL;
	return 0;
}

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

#ifdef	CONFIG_PM

/* USB suspend (controlled by the host) and system suspend (controlled
 * by the PXA) don't necessarily work well together.  If USB is active,
 * the 48 MHz clock is required; so the system can't enter 33 MHz idle
 * mode, or any deeper PM saving state.
 *
 * For now, we punt and forcibly disconnect from the USB host when PXA
 * enters any suspend state.  While we're disconnected, we always disable
 * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states.
 * Boards without software pullup control shouldn't use those states.
 * VBUS IRQs should probably be ignored so that the PXA device just acts
 * "dead" to USB hosts until system resume.
 */
static int pxa25x_udc_suspend(struct platform_device *dev, pm_message_t state)
{
	struct pxa25x_udc	*udc = platform_get_drvdata(dev);
	unsigned long flags;

	if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command)
		WARNING("USB host won't detect disconnect!\n");
	udc->suspended = 1;

	local_irq_save(flags);
	pullup(udc);
	local_irq_restore(flags);

	return 0;
}

static int pxa25x_udc_resume(struct platform_device *dev)
{
	struct pxa25x_udc	*udc = platform_get_drvdata(dev);
	unsigned long flags;

	udc->suspended = 0;
	local_irq_save(flags);
	pullup(udc);
	local_irq_restore(flags);

	return 0;
}

#else
#define	pxa25x_udc_suspend	NULL
#define	pxa25x_udc_resume	NULL
#endif

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

static struct platform_driver udc_driver = {
	.shutdown	= pxa25x_udc_shutdown,
	.remove		= __exit_p(pxa25x_udc_remove),
	.suspend	= pxa25x_udc_suspend,
	.resume		= pxa25x_udc_resume,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "pxa25x-udc",
	},
};

static int __init udc_init(void)
{
	pr_info("%s: version %s\n", driver_name, DRIVER_VERSION);
	return platform_driver_probe(&udc_driver, pxa25x_udc_probe);
}
module_init(udc_init);

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

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa25x-udc");