aboutsummaryrefslogtreecommitdiff
path: root/drivers/mmc/host/vub300.c
blob: 2ec978bc32ba47232b6618db96e2db1bebb25038 (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
/*
 * Remote VUB300 SDIO/SDmem Host Controller Driver
 *
 * Copyright (C) 2010 Elan Digital Systems Limited
 *
 * based on USB Skeleton driver - 2.2
 *
 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
 *
 * 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, version 2
 *
 * VUB300: is a USB 2.0 client device with a single SDIO/SDmem/MMC slot
 *         Any SDIO/SDmem/MMC device plugged into the VUB300 will appear,
 *         by virtue of this driver, to have been plugged into a local
 *         SDIO host controller, similar to, say, a PCI Ricoh controller
 *         This is because this kernel device driver is both a USB 2.0
 *         client device driver AND an MMC host controller driver. Thus
 *         if there is an existing driver for the inserted SDIO/SDmem/MMC
 *         device then that driver will be used by the kernel to manage
 *         the device in exactly the same fashion as if it had been
 *         directly plugged into, say, a local pci bus Ricoh controller
 *
 * RANT: this driver was written using a display 128x48 - converting it
 *       to a line width of 80 makes it very difficult to support. In
 *       particular functions have been broken down into sub functions
 *       and the original meaningful names have been shortened into
 *       cryptic ones.
 *       The problem is that executing a fragment of code subject to
 *       two conditions means an indentation of 24, thus leaving only
 *       56 characters for a C statement. And that is quite ridiculous!
 *
 * Data types: data passed to/from the VUB300 is fixed to a number of
 *             bits and driver data fields reflect that limit by using
 *             u8, u16, u32
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/mutex.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/workqueue.h>
#include <linux/ctype.h>
#include <linux/firmware.h>
#include <linux/scatterlist.h>

struct host_controller_info {
	u8 info_size;
	u16 firmware_version;
	u8 number_of_ports;
} __packed;

#define FIRMWARE_BLOCK_BOUNDARY 1024
struct sd_command_header {
	u8 header_size;
	u8 header_type;
	u8 port_number;
	u8 command_type; /* Bit7 - Rd/Wr */
	u8 command_index;
	u8 transfer_size[4]; /* ReadSize + ReadSize */
	u8 response_type;
	u8 arguments[4];
	u8 block_count[2];
	u8 block_size[2];
	u8 block_boundary[2];
	u8 reserved[44]; /* to pad out to 64 bytes */
} __packed;

struct sd_irqpoll_header {
	u8 header_size;
	u8 header_type;
	u8 port_number;
	u8 command_type; /* Bit7 - Rd/Wr */
	u8 padding[16]; /* don't ask why !! */
	u8 poll_timeout_msb;
	u8 poll_timeout_lsb;
	u8 reserved[42]; /* to pad out to 64 bytes */
} __packed;

struct sd_common_header {
	u8 header_size;
	u8 header_type;
	u8 port_number;
} __packed;

struct sd_response_header {
	u8 header_size;
	u8 header_type;
	u8 port_number;
	u8 command_type;
	u8 command_index;
	u8 command_response[0];
} __packed;

struct sd_status_header {
	u8 header_size;
	u8 header_type;
	u8 port_number;
	u16 port_flags;
	u32 sdio_clock;
	u16 host_header_size;
	u16 func_header_size;
	u16 ctrl_header_size;
} __packed;

struct sd_error_header {
	u8 header_size;
	u8 header_type;
	u8 port_number;
	u8 error_code;
} __packed;

struct sd_interrupt_header {
	u8 header_size;
	u8 header_type;
	u8 port_number;
} __packed;

struct offload_registers_access {
	u8 command_byte[4];
	u8 Respond_Byte[4];
} __packed;

#define INTERRUPT_REGISTER_ACCESSES 15
struct sd_offloaded_interrupt {
	u8 header_size;
	u8 header_type;
	u8 port_number;
	struct offload_registers_access reg[INTERRUPT_REGISTER_ACCESSES];
} __packed;

struct sd_register_header {
	u8 header_size;
	u8 header_type;
	u8 port_number;
	u8 command_type;
	u8 command_index;
	u8 command_response[6];
} __packed;

#define PIGGYBACK_REGISTER_ACCESSES 14
struct sd_offloaded_piggyback {
	struct sd_register_header sdio;
	struct offload_registers_access reg[PIGGYBACK_REGISTER_ACCESSES];
} __packed;

union sd_response {
	struct sd_common_header common;
	struct sd_status_header status;
	struct sd_error_header error;
	struct sd_interrupt_header interrupt;
	struct sd_response_header response;
	struct sd_offloaded_interrupt irq;
	struct sd_offloaded_piggyback pig;
} __packed;

union sd_command {
	struct sd_command_header head;
	struct sd_irqpoll_header poll;
} __packed;

enum SD_RESPONSE_TYPE {
	SDRT_UNSPECIFIED = 0,
	SDRT_NONE,
	SDRT_1,
	SDRT_1B,
	SDRT_2,
	SDRT_3,
	SDRT_4,
	SDRT_5,
	SDRT_5B,
	SDRT_6,
	SDRT_7,
};

#define RESPONSE_INTERRUPT			0x01
#define RESPONSE_ERROR				0x02
#define RESPONSE_STATUS				0x03
#define RESPONSE_IRQ_DISABLED			0x05
#define RESPONSE_IRQ_ENABLED			0x06
#define RESPONSE_PIGGYBACKED			0x07
#define RESPONSE_NO_INTERRUPT			0x08
#define RESPONSE_PIG_DISABLED			0x09
#define RESPONSE_PIG_ENABLED			0x0A
#define SD_ERROR_1BIT_TIMEOUT			0x01
#define SD_ERROR_4BIT_TIMEOUT			0x02
#define SD_ERROR_1BIT_CRC_WRONG			0x03
#define SD_ERROR_4BIT_CRC_WRONG			0x04
#define SD_ERROR_1BIT_CRC_ERROR			0x05
#define SD_ERROR_4BIT_CRC_ERROR			0x06
#define SD_ERROR_NO_CMD_ENDBIT			0x07
#define SD_ERROR_NO_1BIT_DATEND			0x08
#define SD_ERROR_NO_4BIT_DATEND			0x09
#define SD_ERROR_1BIT_UNEXPECTED_TIMEOUT	0x0A
#define SD_ERROR_4BIT_UNEXPECTED_TIMEOUT	0x0B
#define SD_ERROR_ILLEGAL_COMMAND		0x0C
#define SD_ERROR_NO_DEVICE			0x0D
#define SD_ERROR_TRANSFER_LENGTH		0x0E
#define SD_ERROR_1BIT_DATA_TIMEOUT		0x0F
#define SD_ERROR_4BIT_DATA_TIMEOUT		0x10
#define SD_ERROR_ILLEGAL_STATE			0x11
#define SD_ERROR_UNKNOWN_ERROR			0x12
#define SD_ERROR_RESERVED_ERROR			0x13
#define SD_ERROR_INVALID_FUNCTION		0x14
#define SD_ERROR_OUT_OF_RANGE			0x15
#define SD_ERROR_STAT_CMD			0x16
#define SD_ERROR_STAT_DATA			0x17
#define SD_ERROR_STAT_CMD_TIMEOUT		0x18
#define SD_ERROR_SDCRDY_STUCK			0x19
#define SD_ERROR_UNHANDLED			0x1A
#define SD_ERROR_OVERRUN			0x1B
#define SD_ERROR_PIO_TIMEOUT			0x1C

#define FUN(c) (0x000007 & (c->arg>>28))
#define REG(c) (0x01FFFF & (c->arg>>9))

static int limit_speed_to_24_MHz;
module_param(limit_speed_to_24_MHz, bool, 0644);
MODULE_PARM_DESC(limit_speed_to_24_MHz, "Limit Max SDIO Clock Speed to 24 MHz");

static int pad_input_to_usb_pkt;
module_param(pad_input_to_usb_pkt, bool, 0644);
MODULE_PARM_DESC(pad_input_to_usb_pkt,
		 "Pad USB data input transfers to whole USB Packet");

static int disable_offload_processing;
module_param(disable_offload_processing, bool, 0644);
MODULE_PARM_DESC(disable_offload_processing, "Disable Offload Processing");

static int force_1_bit_data_xfers;
module_param(force_1_bit_data_xfers, bool, 0644);
MODULE_PARM_DESC(force_1_bit_data_xfers,
		 "Force SDIO Data Transfers to 1-bit Mode");

static int force_polling_for_irqs;
module_param(force_polling_for_irqs, bool, 0644);
MODULE_PARM_DESC(force_polling_for_irqs, "Force Polling for SDIO interrupts");

static int firmware_irqpoll_timeout = 1024;
module_param(firmware_irqpoll_timeout, int, 0644);
MODULE_PARM_DESC(firmware_irqpoll_timeout, "VUB300 firmware irqpoll timeout");

static int force_max_req_size = 128;
module_param(force_max_req_size, int, 0644);
MODULE_PARM_DESC(force_max_req_size, "set max request size in kBytes");

#ifdef SMSC_DEVELOPMENT_BOARD
static int firmware_rom_wait_states = 0x04;
#else
static int firmware_rom_wait_states = 0x1C;
#endif

module_param(firmware_rom_wait_states, int, 0644);
MODULE_PARM_DESC(firmware_rom_wait_states,
		 "ROM wait states byte=RRRIIEEE (Reserved Internal External)");

#define ELAN_VENDOR_ID		0x2201
#define VUB300_VENDOR_ID	0x0424
#define VUB300_PRODUCT_ID	0x012C
static struct usb_device_id vub300_table[] = {
	{USB_DEVICE(ELAN_VENDOR_ID, VUB300_PRODUCT_ID)},
	{USB_DEVICE(VUB300_VENDOR_ID, VUB300_PRODUCT_ID)},
	{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, vub300_table);

static struct workqueue_struct *cmndworkqueue;
static struct workqueue_struct *pollworkqueue;
static struct workqueue_struct *deadworkqueue;

static inline int interface_to_InterfaceNumber(struct usb_interface *interface)
{
	if (!interface)
		return -1;
	if (!interface->cur_altsetting)
		return -1;
	return interface->cur_altsetting->desc.bInterfaceNumber;
}

struct sdio_register {
	unsigned func_num:3;
	unsigned sdio_reg:17;
	unsigned activate:1;
	unsigned prepared:1;
	unsigned regvalue:8;
	unsigned response:8;
	unsigned sparebit:26;
};

struct vub300_mmc_host {
	struct usb_device *udev;
	struct usb_interface *interface;
	struct kref kref;
	struct mutex cmd_mutex;
	struct mutex irq_mutex;
	char vub_name[3 + (9 * 8) + 4 + 1]; /* max of 7 sdio fn's */
	u8 cmnd_out_ep; /* EndPoint for commands */
	u8 cmnd_res_ep; /* EndPoint for responses */
	u8 data_out_ep; /* EndPoint for out data */
	u8 data_inp_ep; /* EndPoint for inp data */
	bool card_powered;
	bool card_present;
	bool read_only;
	bool large_usb_packets;
	bool app_spec; /* ApplicationSpecific */
	bool irq_enabled; /* by the MMC CORE */
	bool irq_disabled; /* in the firmware */
	unsigned bus_width:4;
	u8 total_offload_count;
	u8 dynamic_register_count;
	u8 resp_len;
	u32 datasize;
	int errors;
	int usb_transport_fail;
	int usb_timed_out;
	int irqs_queued;
	struct sdio_register sdio_register[16];
	struct offload_interrupt_function_register {
#define MAXREGBITS 4
#define MAXREGS (1<<MAXREGBITS)
#define MAXREGMASK (MAXREGS-1)
		u8 offload_count;
		u32 offload_point;
		struct offload_registers_access reg[MAXREGS];
	} fn[8];
	u16 fbs[8]; /* Function Block Size */
	struct mmc_command *cmd;
	struct mmc_request *req;
	struct mmc_data *data;
	struct mmc_host *mmc;
	struct urb *urb;
	struct urb *command_out_urb;
	struct urb *command_res_urb;
	struct completion command_complete;
	struct completion irqpoll_complete;
	union sd_command cmnd;
	union sd_response resp;
	struct timer_list sg_transfer_timer;
	struct usb_sg_request sg_request;
	struct timer_list inactivity_timer;
	struct work_struct deadwork;
	struct work_struct cmndwork;
	struct delayed_work pollwork;
	struct host_controller_info hc_info;
	struct sd_status_header system_port_status;
	u8 padded_buffer[64];
};

#define kref_to_vub300_mmc_host(d) container_of(d, struct vub300_mmc_host, kref)
#define SET_TRANSFER_PSEUDOCODE		21
#define SET_INTERRUPT_PSEUDOCODE	20
#define SET_FAILURE_MODE		18
#define SET_ROM_WAIT_STATES		16
#define SET_IRQ_ENABLE			13
#define SET_CLOCK_SPEED			11
#define SET_FUNCTION_BLOCK_SIZE		9
#define SET_SD_DATA_MODE		6
#define SET_SD_POWER			4
#define ENTER_DFU_MODE			3
#define GET_HC_INF0			1
#define GET_SYSTEM_PORT_STATUS		0

static void vub300_delete(struct kref *kref)
{				/* kref callback - softirq */
	struct vub300_mmc_host *vub300 = kref_to_vub300_mmc_host(kref);
	struct mmc_host *mmc = vub300->mmc;
	usb_free_urb(vub300->command_out_urb);
	vub300->command_out_urb = NULL;
	usb_free_urb(vub300->command_res_urb);
	vub300->command_res_urb = NULL;
	usb_put_dev(vub300->udev);
	mmc_free_host(mmc);
	/*
	 * and hence also frees vub300
	 * which is contained at the end of struct mmc
	 */
}

static void vub300_queue_cmnd_work(struct vub300_mmc_host *vub300)
{
	kref_get(&vub300->kref);
	if (queue_work(cmndworkqueue, &vub300->cmndwork)) {
		/*
		 * then the cmndworkqueue was not previously
		 * running and the above get ref is obvious
		 * required and will be put when the thread
		 * terminates by a specific call
		 */
	} else {
		/*
		 * the cmndworkqueue was already running from
		 * a previous invocation and thus to keep the
		 * kref counts correct we must undo the get
		 */
		kref_put(&vub300->kref, vub300_delete);
	}
}

static void vub300_queue_poll_work(struct vub300_mmc_host *vub300, int delay)
{
	kref_get(&vub300->kref);
	if (queue_delayed_work(pollworkqueue, &vub300->pollwork, delay)) {
		/*
		 * then the pollworkqueue was not previously
		 * running and the above get ref is obvious
		 * required and will be put when the thread
		 * terminates by a specific call
		 */
	} else {
		/*
		 * the pollworkqueue was already running from
		 * a previous invocation and thus to keep the
		 * kref counts correct we must undo the get
		 */
		kref_put(&vub300->kref, vub300_delete);
	}
}

static void vub300_queue_dead_work(struct vub300_mmc_host *vub300)
{
	kref_get(&vub300->kref);
	if (queue_work(deadworkqueue, &vub300->deadwork)) {
		/*
		 * then the deadworkqueue was not previously
		 * running and the above get ref is obvious
		 * required and will be put when the thread
		 * terminates by a specific call
		 */
	} else {
		/*
		 * the deadworkqueue was already running from
		 * a previous invocation and thus to keep the
		 * kref counts correct we must undo the get
		 */
		kref_put(&vub300->kref, vub300_delete);
	}
}

static void irqpoll_res_completed(struct urb *urb)
{				/* urb completion handler - hardirq */
	struct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)urb->context;
	if (urb->status)
		vub300->usb_transport_fail = urb->status;
	complete(&vub300->irqpoll_complete);
}

static void irqpoll_out_completed(struct urb *urb)
{				/* urb completion handler - hardirq */
	struct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)urb->context;
	if (urb->status) {
		vub300->usb_transport_fail = urb->status;
		complete(&vub300->irqpoll_complete);
		return;
	} else {
		int ret;
		unsigned int pipe =
			usb_rcvbulkpipe(vub300->udev, vub300->cmnd_res_ep);
		usb_fill_bulk_urb(vub300->command_res_urb, vub300->udev, pipe,
				  &vub300->resp, sizeof(vub300->resp),
				  irqpoll_res_completed, vub300);
		vub300->command_res_urb->actual_length = 0;
		ret = usb_submit_urb(vub300->command_res_urb, GFP_ATOMIC);
		if (ret) {
			vub300->usb_transport_fail = ret;
			complete(&vub300->irqpoll_complete);
		}
		return;
	}
}

static void send_irqpoll(struct vub300_mmc_host *vub300)
{
	/* cmd_mutex is held by vub300_pollwork_thread */
	int retval;
	int timeout = 0xFFFF & (0x0001FFFF - firmware_irqpoll_timeout);
	vub300->cmnd.poll.header_size = 22;
	vub300->cmnd.poll.header_type = 1;
	vub300->cmnd.poll.port_number = 0;
	vub300->cmnd.poll.command_type = 2;
	vub300->cmnd.poll.poll_timeout_lsb = 0xFF & (unsigned)timeout;
	vub300->cmnd.poll.poll_timeout_msb = 0xFF & (unsigned)(timeout >> 8);
	usb_fill_bulk_urb(vub300->command_out_urb, vub300->udev,
			  usb_sndbulkpipe(vub300->udev, vub300->cmnd_out_ep)
			  , &vub300->cmnd, sizeof(vub300->cmnd)
			  , irqpoll_out_completed, vub300);
	retval = usb_submit_urb(vub300->command_out_urb, GFP_KERNEL);
	if (0 > retval) {
		vub300->usb_transport_fail = retval;
		vub300_queue_poll_work(vub300, 1);
		complete(&vub300->irqpoll_complete);
		return;
	} else {
		return;
	}
}

static void new_system_port_status(struct vub300_mmc_host *vub300)
{
	int old_card_present = vub300->card_present;
	int new_card_present =
		(0x0001 & vub300->system_port_status.port_flags) ? 1 : 0;
	vub300->read_only =
		(0x0010 & vub300->system_port_status.port_flags) ? 1 : 0;
	if (new_card_present && !old_card_present) {
		dev_info(&vub300->udev->dev, "card just inserted\n");
		vub300->card_present = 1;
		vub300->bus_width = 0;
		if (disable_offload_processing)
			strncpy(vub300->vub_name, "EMPTY Processing Disabled",
				sizeof(vub300->vub_name));
		else
			vub300->vub_name[0] = 0;
		mmc_detect_change(vub300->mmc, 1);
	} else if (!new_card_present && old_card_present) {
		dev_info(&vub300->udev->dev, "card just ejected\n");
		vub300->card_present = 0;
		mmc_detect_change(vub300->mmc, 0);
	} else {
		/* no change */
	}
}

static void __add_offloaded_reg_to_fifo(struct vub300_mmc_host *vub300,
					struct offload_registers_access
					*register_access, u8 func)
{
	u8 r = vub300->fn[func].offload_point + vub300->fn[func].offload_count;
	memcpy(&vub300->fn[func].reg[MAXREGMASK & r], register_access,
	       sizeof(struct offload_registers_access));
	vub300->fn[func].offload_count += 1;
	vub300->total_offload_count += 1;
}

static void add_offloaded_reg(struct vub300_mmc_host *vub300,
			      struct offload_registers_access *register_access)
{
	u32 Register = ((0x03 & register_access->command_byte[0]) << 15)
			| ((0xFF & register_access->command_byte[1]) << 7)
			| ((0xFE & register_access->command_byte[2]) >> 1);
	u8 func = ((0x70 & register_access->command_byte[0]) >> 4);
	u8 regs = vub300->dynamic_register_count;
	u8 i = 0;
	while (0 < regs-- && 1 == vub300->sdio_register[i].activate) {
		if (vub300->sdio_register[i].func_num == func &&
		    vub300->sdio_register[i].sdio_reg == Register) {
			if (vub300->sdio_register[i].prepared == 0)
				vub300->sdio_register[i].prepared = 1;
			vub300->sdio_register[i].response =
				register_access->Respond_Byte[2];
			vub300->sdio_register[i].regvalue =
				register_access->Respond_Byte[3];
			return;
		} else {
			i += 1;
			continue;
		}
	};
	__add_offloaded_reg_to_fifo(vub300, register_access, func);
}

static void check_vub300_port_status(struct vub300_mmc_host *vub300)
{
	/*
	 * cmd_mutex is held by vub300_pollwork_thread,
	 * vub300_deadwork_thread or vub300_cmndwork_thread
	 */
	int retval;
	retval =
		usb_control_msg(vub300->udev, usb_rcvctrlpipe(vub300->udev, 0),
				GET_SYSTEM_PORT_STATUS,
				USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				0x0000, 0x0000, &vub300->system_port_status,
				sizeof(vub300->system_port_status), HZ);
	if (sizeof(vub300->system_port_status) == retval)
		new_system_port_status(vub300);
}

static void __vub300_irqpoll_response(struct vub300_mmc_host *vub300)
{
	/* cmd_mutex is held by vub300_pollwork_thread */
	if (vub300->command_res_urb->actual_length == 0)
		return;

	switch (vub300->resp.common.header_type) {
	case RESPONSE_INTERRUPT:
		mutex_lock(&vub300->irq_mutex);
		if (vub300->irq_enabled)
			mmc_signal_sdio_irq(vub300->mmc);
		else
			vub300->irqs_queued += 1;
		vub300->irq_disabled = 1;
		mutex_unlock(&vub300->irq_mutex);
		break;
	case RESPONSE_ERROR:
		if (vub300->resp.error.error_code == SD_ERROR_NO_DEVICE)
			check_vub300_port_status(vub300);
		break;
	case RESPONSE_STATUS:
		vub300->system_port_status = vub300->resp.status;
		new_system_port_status(vub300);
		if (!vub300->card_present)
			vub300_queue_poll_work(vub300, HZ / 5);
		break;
	case RESPONSE_IRQ_DISABLED:
	{
		int offloaded_data_length = vub300->resp.common.header_size - 3;
		int register_count = offloaded_data_length >> 3;
		int ri = 0;
		while (register_count--) {
			add_offloaded_reg(vub300, &vub300->resp.irq.reg[ri]);
			ri += 1;
		}
		mutex_lock(&vub300->irq_mutex);
		if (vub300->irq_enabled)
			mmc_signal_sdio_irq(vub300->mmc);
		else
			vub300->irqs_queued += 1;
		vub300->irq_disabled = 1;
		mutex_unlock(&vub300->irq_mutex);
		break;
	}
	case RESPONSE_IRQ_ENABLED:
	{
		int offloaded_data_length = vub300->resp.common.header_size - 3;
		int register_count = offloaded_data_length >> 3;
		int ri = 0;
		while (register_count--) {
			add_offloaded_reg(vub300, &vub300->resp.irq.reg[ri]);
			ri += 1;
		}
		mutex_lock(&vub300->irq_mutex);
		if (vub300->irq_enabled)
			mmc_signal_sdio_irq(vub300->mmc);
		else if (vub300->irqs_queued)
			vub300->irqs_queued += 1;
		else
			vub300->irqs_queued += 1;
		vub300->irq_disabled = 0;
		mutex_unlock(&vub300->irq_mutex);
		break;
	}
	case RESPONSE_NO_INTERRUPT:
		vub300_queue_poll_work(vub300, 1);
		break;
	default:
		break;
	}
}

static void __do_poll(struct vub300_mmc_host *vub300)
{
	/* cmd_mutex is held by vub300_pollwork_thread */
	long commretval;
	mod_timer(&vub300->inactivity_timer, jiffies + HZ);
	init_completion(&vub300->irqpoll_complete);
	send_irqpoll(vub300);
	commretval = wait_for_completion_timeout(&vub300->irqpoll_complete,
						 msecs_to_jiffies(500));
	if (vub300->usb_transport_fail) {
		/* no need to do anything */
	} else if (commretval == 0) {
		vub300->usb_timed_out = 1;
		usb_kill_urb(vub300->command_out_urb);
		usb_kill_urb(vub300->command_res_urb);
	} else if (commretval < 0) {
		vub300_queue_poll_work(vub300, 1);
	} else { /* commretval > 0 */
		__vub300_irqpoll_response(vub300);
	}
}

/* this thread runs only when the driver
 * is trying to poll the device for an IRQ
 */
static void vub300_pollwork_thread(struct work_struct *work)
{				/* NOT irq */
	struct vub300_mmc_host *vub300 = container_of(work,
			      struct vub300_mmc_host, pollwork.work);
	if (!vub300->interface) {
		kref_put(&vub300->kref, vub300_delete);
		return;
	}
	mutex_lock(&vub300->cmd_mutex);
	if (vub300->cmd) {
		vub300_queue_poll_work(vub300, 1);
	} else if (!vub300->card_present) {
		/* no need to do anything */
	} else { /* vub300->card_present */
		mutex_lock(&vub300->irq_mutex);
		if (!vub300->irq_enabled) {
			mutex_unlock(&vub300->irq_mutex);
		} else if (vub300->irqs_queued) {
			vub300->irqs_queued -= 1;
			mmc_signal_sdio_irq(vub300->mmc);
			mod_timer(&vub300->inactivity_timer, jiffies + HZ);
			mutex_unlock(&vub300->irq_mutex);
		} else { /* NOT vub300->irqs_queued */
			mutex_unlock(&vub300->irq_mutex);
			__do_poll(vub300);
		}
	}
	mutex_unlock(&vub300->cmd_mutex);
	kref_put(&vub300->kref, vub300_delete);
}

static void vub300_deadwork_thread(struct work_struct *work)
{				/* NOT irq */
	struct vub300_mmc_host *vub300 =
		container_of(work, struct vub300_mmc_host, deadwork);
	if (!vub300->interface) {
		kref_put(&vub300->kref, vub300_delete);
		return;
	}
	mutex_lock(&vub300->cmd_mutex);
	if (vub300->cmd) {
		/*
		 * a command got in as the inactivity
		 * timer expired - so we just let the
		 * processing of the command show if
		 * the device is dead
		 */
	} else if (vub300->card_present) {
		check_vub300_port_status(vub300);
	} else if (vub300->mmc && vub300->mmc->card &&
		   mmc_card_present(vub300->mmc->card)) {
		/*
		 * the MMC core must not have responded
		 * to the previous indication - lets
		 * hope that it eventually does so we
		 * will just ignore this for now
		 */
	} else {
		check_vub300_port_status(vub300);
	}
	mod_timer(&vub300->inactivity_timer, jiffies + HZ);
	mutex_unlock(&vub300->cmd_mutex);
	kref_put(&vub300->kref, vub300_delete);
}

static void vub300_inactivity_timer_expired(unsigned long data)
{				/* softirq */
	struct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)data;
	if (!vub300->interface) {
		kref_put(&vub300->kref, vub300_delete);
	} else if (vub300->cmd) {
		mod_timer(&vub300->inactivity_timer, jiffies + HZ);
	} else {
		vub300_queue_dead_work(vub300);
		mod_timer(&vub300->inactivity_timer, jiffies + HZ);
	}
}

static int vub300_response_error(u8 error_code)
{
	switch (error_code) {
	case SD_ERROR_PIO_TIMEOUT:
	case SD_ERROR_1BIT_TIMEOUT:
	case SD_ERROR_4BIT_TIMEOUT:
		return -ETIMEDOUT;
	case SD_ERROR_STAT_DATA:
	case SD_ERROR_OVERRUN:
	case SD_ERROR_STAT_CMD:
	case SD_ERROR_STAT_CMD_TIMEOUT:
	case SD_ERROR_SDCRDY_STUCK:
	case SD_ERROR_UNHANDLED:
	case SD_ERROR_1BIT_CRC_WRONG:
	case SD_ERROR_4BIT_CRC_WRONG:
	case SD_ERROR_1BIT_CRC_ERROR:
	case SD_ERROR_4BIT_CRC_ERROR:
	case SD_ERROR_NO_CMD_ENDBIT:
	case SD_ERROR_NO_1BIT_DATEND:
	case SD_ERROR_NO_4BIT_DATEND:
	case SD_ERROR_1BIT_DATA_TIMEOUT:
	case SD_ERROR_4BIT_DATA_TIMEOUT:
	case SD_ERROR_1BIT_UNEXPECTED_TIMEOUT:
	case SD_ERROR_4BIT_UNEXPECTED_TIMEOUT:
		return -EILSEQ;
	case 33:
		return -EILSEQ;
	case SD_ERROR_ILLEGAL_COMMAND:
		return -EINVAL;
	case SD_ERROR_NO_DEVICE:
		return -ENOMEDIUM;
	default:
		return -ENODEV;
	}
}

static void command_res_completed(struct urb *urb)
{				/* urb completion handler - hardirq */
	struct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)urb->context;
	if (urb->status) {
		/* we have to let the initiator handle the error */
	} else if (vub300->command_res_urb->actual_length == 0) {
		/*
		 * we have seen this happen once or twice and
		 * we suspect a buggy USB host controller
		 */
	} else if (!vub300->data) {
		/* this means that the command (typically CMD52) suceeded */
	} else if (vub300->resp.common.header_type != 0x02) {
		/*
		 * this is an error response from the VUB300 chip
		 * and we let the initiator handle it
		 */
	} else if (vub300->urb) {
		vub300->cmd->error =
			vub300_response_error(vub300->resp.error.error_code);
		usb_unlink_urb(vub300->urb);
	} else {
		vub300->cmd->error =
			vub300_response_error(vub300->resp.error.error_code);
		usb_sg_cancel(&vub300->sg_request);
	}
	complete(&vub300->command_complete);	/* got_response_in */
}

static void command_out_completed(struct urb *urb)
{				/* urb completion handler - hardirq */
	struct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)urb->context;
	if (urb->status) {
		complete(&vub300->command_complete);
	} else {
		int ret;
		unsigned int pipe =
			usb_rcvbulkpipe(vub300->udev, vub300->cmnd_res_ep);
		usb_fill_bulk_urb(vub300->command_res_urb, vub300->udev, pipe,
				  &vub300->resp, sizeof(vub300->resp),
				  command_res_completed, vub300);
		vub300->command_res_urb->actual_length = 0;
		ret = usb_submit_urb(vub300->command_res_urb, GFP_ATOMIC);
		if (ret == 0) {
			/*
			 * the urb completion handler will call
			 * our completion handler
			 */
		} else {
			/*
			 * and thus we only call it directly
			 * when it will not be called
			 */
			complete(&vub300->command_complete);
		}
	}
}

/*
 * the STUFF bits are masked out for the comparisons
 */
static void snoop_block_size_and_bus_width(struct vub300_mmc_host *vub300,
					   u32 cmd_arg)
{
	if ((0xFBFFFE00 & cmd_arg) == 0x80022200)
		vub300->fbs[1] = (cmd_arg << 8) | (0x00FF & vub300->fbs[1]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x80022000)
		vub300->fbs[1] = (0xFF & cmd_arg) | (0xFF00 & vub300->fbs[1]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x80042200)
		vub300->fbs[2] = (cmd_arg << 8) | (0x00FF & vub300->fbs[2]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x80042000)
		vub300->fbs[2] = (0xFF & cmd_arg) | (0xFF00 & vub300->fbs[2]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x80062200)
		vub300->fbs[3] = (cmd_arg << 8) | (0x00FF & vub300->fbs[3]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x80062000)
		vub300->fbs[3] = (0xFF & cmd_arg) | (0xFF00 & vub300->fbs[3]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x80082200)
		vub300->fbs[4] = (cmd_arg << 8) | (0x00FF & vub300->fbs[4]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x80082000)
		vub300->fbs[4] = (0xFF & cmd_arg) | (0xFF00 & vub300->fbs[4]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x800A2200)
		vub300->fbs[5] = (cmd_arg << 8) | (0x00FF & vub300->fbs[5]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x800A2000)
		vub300->fbs[5] = (0xFF & cmd_arg) | (0xFF00 & vub300->fbs[5]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x800C2200)
		vub300->fbs[6] = (cmd_arg << 8) | (0x00FF & vub300->fbs[6]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x800C2000)
		vub300->fbs[6] = (0xFF & cmd_arg) | (0xFF00 & vub300->fbs[6]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x800E2200)
		vub300->fbs[7] = (cmd_arg << 8) | (0x00FF & vub300->fbs[7]);
	else if ((0xFBFFFE00 & cmd_arg) == 0x800E2000)
		vub300->fbs[7] = (0xFF & cmd_arg) | (0xFF00 & vub300->fbs[7]);
	else if ((0xFBFFFE03 & cmd_arg) == 0x80000E00)
		vub300->bus_width = 1;
	else if ((0xFBFFFE03 & cmd_arg) == 0x80000E02)
		vub300->bus_width = 4;
}

static void send_command(struct vub300_mmc_host *vub300)
{
	/* cmd_mutex is held by vub300_cmndwork_thread */
	struct mmc_command *cmd = vub300->cmd;
	struct mmc_data *data = vub300->data;
	int retval;
	int i;
	u8 response_type;
	if (vub300->app_spec) {
		switch (cmd->opcode) {
		case 6:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			if (0x00000000 == (0x00000003 & cmd->arg))
				vub300->bus_width = 1;
			else if (0x00000002 == (0x00000003 & cmd->arg))
				vub300->bus_width = 4;
			else
				dev_err(&vub300->udev->dev,
					"unexpected ACMD6 bus_width=%d\n",
					0x00000003 & cmd->arg);
			break;
		case 13:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 22:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 23:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 41:
			response_type = SDRT_3;
			vub300->resp_len = 6;
			break;
		case 42:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 51:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 55:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		default:
			vub300->resp_len = 0;
			cmd->error = -EINVAL;
			complete(&vub300->command_complete);
			return;
		}
		vub300->app_spec = 0;
	} else {
		switch (cmd->opcode) {
		case 0:
			response_type = SDRT_NONE;
			vub300->resp_len = 0;
			break;
		case 1:
			response_type = SDRT_3;
			vub300->resp_len = 6;
			break;
		case 2:
			response_type = SDRT_2;
			vub300->resp_len = 17;
			break;
		case 3:
			response_type = SDRT_6;
			vub300->resp_len = 6;
			break;
		case 4:
			response_type = SDRT_NONE;
			vub300->resp_len = 0;
			break;
		case 5:
			response_type = SDRT_4;
			vub300->resp_len = 6;
			break;
		case 6:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 7:
			response_type = SDRT_1B;
			vub300->resp_len = 6;
			break;
		case 8:
			response_type = SDRT_7;
			vub300->resp_len = 6;
			break;
		case 9:
			response_type = SDRT_2;
			vub300->resp_len = 17;
			break;
		case 10:
			response_type = SDRT_2;
			vub300->resp_len = 17;
			break;
		case 12:
			response_type = SDRT_1B;
			vub300->resp_len = 6;
			break;
		case 13:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 15:
			response_type = SDRT_NONE;
			vub300->resp_len = 0;
			break;
		case 16:
			for (i = 0; i < ARRAY_SIZE(vub300->fbs); i++)
				vub300->fbs[i] = 0xFFFF & cmd->arg;
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 17:
		case 18:
		case 24:
		case 25:
		case 27:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 28:
		case 29:
			response_type = SDRT_1B;
			vub300->resp_len = 6;
			break;
		case 30:
		case 32:
		case 33:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 38:
			response_type = SDRT_1B;
			vub300->resp_len = 6;
			break;
		case 42:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		case 52:
			response_type = SDRT_5;
			vub300->resp_len = 6;
			snoop_block_size_and_bus_width(vub300, cmd->arg);
			break;
		case 53:
			response_type = SDRT_5;
			vub300->resp_len = 6;
			break;
		case 55:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			vub300->app_spec = 1;
			break;
		case 56:
			response_type = SDRT_1;
			vub300->resp_len = 6;
			break;
		default:
			vub300->resp_len = 0;
			cmd->error = -EINVAL;
			complete(&vub300->command_complete);
			return;
		}
	}
	/*
	 * it is a shame that we can not use "sizeof(struct sd_command_header)"
	 * this is because the packet _must_ be padded to 64 bytes
	 */
	vub300->cmnd.head.header_size = 20;
	vub300->cmnd.head.header_type = 0x00;
	vub300->cmnd.head.port_number = 0; /* "0" means port 1 */
	vub300->cmnd.head.command_type = 0x00; /* standard read command */
	vub300->cmnd.head.response_type = response_type;
	vub300->cmnd.head.command_index = cmd->opcode;
	vub300->cmnd.head.arguments[0] = cmd->arg >> 24;
	vub300->cmnd.head.arguments[1] = cmd->arg >> 16;
	vub300->cmnd.head.arguments[2] = cmd->arg >> 8;
	vub300->cmnd.head.arguments[3] = cmd->arg >> 0;
	if (cmd->opcode == 52) {
		int fn = 0x7 & (cmd->arg >> 28);
		vub300->cmnd.head.block_count[0] = 0;
		vub300->cmnd.head.block_count[1] = 0;
		vub300->cmnd.head.block_size[0] = (vub300->fbs[fn] >> 8) & 0xFF;
		vub300->cmnd.head.block_size[1] = (vub300->fbs[fn] >> 0) & 0xFF;
		vub300->cmnd.head.command_type = 0x00;
		vub300->cmnd.head.transfer_size[0] = 0;
		vub300->cmnd.head.transfer_size[1] = 0;
		vub300->cmnd.head.transfer_size[2] = 0;
		vub300->cmnd.head.transfer_size[3] = 0;
	} else if (!data) {
		vub300->cmnd.head.block_count[0] = 0;
		vub300->cmnd.head.block_count[1] = 0;
		vub300->cmnd.head.block_size[0] = (vub300->fbs[0] >> 8) & 0xFF;
		vub300->cmnd.head.block_size[1] = (vub300->fbs[0] >> 0) & 0xFF;
		vub300->cmnd.head.command_type = 0x00;
		vub300->cmnd.head.transfer_size[0] = 0;
		vub300->cmnd.head.transfer_size[1] = 0;
		vub300->cmnd.head.transfer_size[2] = 0;
		vub300->cmnd.head.transfer_size[3] = 0;
	} else if (cmd->opcode == 53) {
		int fn = 0x7 & (cmd->arg >> 28);
		if (0x08 & vub300->cmnd.head.arguments[0]) { /* BLOCK MODE */
			vub300->cmnd.head.block_count[0] =
				(data->blocks >> 8) & 0xFF;
			vub300->cmnd.head.block_count[1] =
				(data->blocks >> 0) & 0xFF;
			vub300->cmnd.head.block_size[0] =
				(data->blksz >> 8) & 0xFF;
			vub300->cmnd.head.block_size[1] =
				(data->blksz >> 0) & 0xFF;
		} else {	/* BYTE MODE */
			vub300->cmnd.head.block_count[0] = 0;
			vub300->cmnd.head.block_count[1] = 0;
			vub300->cmnd.head.block_size[0] =
				(vub300->datasize >> 8) & 0xFF;
			vub300->cmnd.head.block_size[1] =
				(vub300->datasize >> 0) & 0xFF;
		}
		vub300->cmnd.head.command_type =
			(MMC_DATA_READ & data->flags) ? 0x00 : 0x80;
		vub300->cmnd.head.transfer_size[0] =
			(vub300->datasize >> 24) & 0xFF;
		vub300->cmnd.head.transfer_size[1] =
			(vub300->datasize >> 16) & 0xFF;
		vub300->cmnd.head.transfer_size[2] =
			(vub300->datasize >> 8) & 0xFF;
		vub300->cmnd.head.transfer_size[3] =
			(vub300->datasize >> 0) & 0xFF;
		if (vub300->datasize < vub300->fbs[fn]) {
			vub300->cmnd.head.block_count[0] = 0;
			vub300->cmnd.head.block_count[1] = 0;
		}
	} else {
		vub300->cmnd.head.block_count[0] = (data->blocks >> 8) & 0xFF;
		vub300->cmnd.head.block_count[1] = (data->blocks >> 0) & 0xFF;
		vub300->cmnd.head.block_size[0] = (data->blksz >> 8) & 0xFF;
		vub300->cmnd.head.block_size[1] = (data->blksz >> 0) & 0xFF;
		vub300->cmnd.head.command_type =
			(MMC_DATA_READ & data->flags) ? 0x00 : 0x80;
		vub300->cmnd.head.transfer_size[0] =
			(vub300->datasize >> 24) & 0xFF;
		vub300->cmnd.head.transfer_size[1] =
			(vub300->datasize >> 16) & 0xFF;
		vub300->cmnd.head.transfer_size[2] =
			(vub300->datasize >> 8) & 0xFF;
		vub300->cmnd.head.transfer_size[3] =
			(vub300->datasize >> 0) & 0xFF;
		if (vub300->datasize < vub300->fbs[0]) {
			vub300->cmnd.head.block_count[0] = 0;
			vub300->cmnd.head.block_count[1] = 0;
		}
	}
	if (vub300->cmnd.head.block_size[0] || vub300->cmnd.head.block_size[1]) {
		u16 block_size = vub300->cmnd.head.block_size[1] |
			(vub300->cmnd.head.block_size[0] << 8);
		u16 block_boundary = FIRMWARE_BLOCK_BOUNDARY -
			(FIRMWARE_BLOCK_BOUNDARY % block_size);
		vub300->cmnd.head.block_boundary[0] =
			(block_boundary >> 8) & 0xFF;
		vub300->cmnd.head.block_boundary[1] =
			(block_boundary >> 0) & 0xFF;
	} else {
		vub300->cmnd.head.block_boundary[0] = 0;
		vub300->cmnd.head.block_boundary[1] = 0;
	}
	usb_fill_bulk_urb(vub300->command_out_urb, vub300->udev,
			  usb_sndbulkpipe(vub300->udev, vub300->cmnd_out_ep),
			  &vub300->cmnd, sizeof(vub300->cmnd),
			  command_out_completed, vub300);
	retval = usb_submit_urb(vub300->command_out_urb, GFP_KERNEL);
	if (retval < 0) {
		cmd->error = retval;
		complete(&vub300->command_complete);
		return;
	} else {
		return;
	}
}

/*
 * timer callback runs in atomic mode
 *       so it cannot call usb_kill_urb()
 */
static void vub300_sg_timed_out(unsigned long data)
{
	struct vub300_mmc_host *vub300 = (struct vub300_mmc_host *)data;
	vub300->usb_timed_out = 1;
	usb_sg_cancel(&vub300->sg_request);
	usb_unlink_urb(vub300->command_out_urb);
	usb_unlink_urb(vub300->command_res_urb);
}

static u16 roundup_to_multiple_of_64(u16 number)
{
	return 0xFFC0 & (0x3F + number);
}

/*
 * this is a separate function to solve the 80 column width restriction
 */
static void __download_offload_pseudocode(struct vub300_mmc_host *vub300,
					  const struct firmware *fw)
{
	u8 register_count = 0;
	u16 ts = 0;
	u16 interrupt_size = 0;
	const u8 *data = fw->data;
	int size = fw->size;
	u8 c;
	dev_info(&vub300->udev->dev, "using %s for SDIO offload processing\n",
		 vub300->vub_name);
	do {
		c = *data++;
	} while (size-- && c); /* skip comment */
	dev_info(&vub300->udev->dev, "using offload firmware %s %s\n", fw->data,
		 vub300->vub_name);
	if (size < 4) {
		dev_err(&vub300->udev->dev,
			"corrupt offload pseudocode in firmware %s\n",
			vub300->vub_name);
		strncpy(vub300->vub_name, "corrupt offload pseudocode",
			sizeof(vub300->vub_name));
		return;
	}
	interrupt_size += *data++;
	size -= 1;
	interrupt_size <<= 8;
	interrupt_size += *data++;
	size -= 1;
	if (interrupt_size < size) {
		u16 xfer_length = roundup_to_multiple_of_64(interrupt_size);
		u8 *xfer_buffer = kmalloc(xfer_length, GFP_KERNEL);
		if (xfer_buffer) {
			int retval;
			memcpy(xfer_buffer, data, interrupt_size);
			memset(xfer_buffer + interrupt_size, 0,
			       xfer_length - interrupt_size);
			size -= interrupt_size;
			data += interrupt_size;
			retval =
				usb_control_msg(vub300->udev,
						usb_sndctrlpipe(vub300->udev, 0),
						SET_INTERRUPT_PSEUDOCODE,
						USB_DIR_OUT | USB_TYPE_VENDOR |
						USB_RECIP_DEVICE, 0x0000, 0x0000,
						xfer_buffer, xfer_length, HZ);
			kfree(xfer_buffer);
			if (retval < 0) {
				strncpy(vub300->vub_name,
					"SDIO pseudocode download failed",
					sizeof(vub300->vub_name));
				return;
			}
		} else {
			dev_err(&vub300->udev->dev,
				"not enough memory for xfer buffer to send"
				" INTERRUPT_PSEUDOCODE for %s %s\n", fw->data,
				vub300->vub_name);
			strncpy(vub300->vub_name,
				"SDIO interrupt pseudocode download failed",
				sizeof(vub300->vub_name));
			return;
		}
	} else {
		dev_err(&vub300->udev->dev,
			"corrupt interrupt pseudocode in firmware %s %s\n",
			fw->data, vub300->vub_name);
		strncpy(vub300->vub_name, "corrupt interrupt pseudocode",
			sizeof(vub300->vub_name));
		return;
	}
	ts += *data++;
	size -= 1;
	ts <<= 8;
	ts += *data++;
	size -= 1;
	if (ts < size) {
		u16 xfer_length = roundup_to_multiple_of_64(ts);
		u8 *xfer_buffer = kmalloc(xfer_length, GFP_KERNEL);
		if (xfer_buffer) {
			int retval;
			memcpy(xfer_buffer, data, ts);
			memset(xfer_buffer + ts, 0,
			       xfer_length - ts);
			size -= ts;
			data += ts;
			retval =
				usb_control_msg(vub300->udev,
						usb_sndctrlpipe(vub300->udev, 0),
						SET_TRANSFER_PSEUDOCODE,
						USB_DIR_OUT | USB_TYPE_VENDOR |
						USB_RECIP_DEVICE, 0x0000, 0x0000,
						xfer_buffer, xfer_length, HZ);
			kfree(xfer_buffer);
			if (retval < 0) {
				strncpy(vub300->vub_name,
					"SDIO pseudocode download failed",
					sizeof(vub300->vub_name));
				return;
			}
		} else {
			dev_err(&vub300->udev->dev,
				"not enough memory for xfer buffer to send"
				" TRANSFER_PSEUDOCODE for %s %s\n", fw->data,
				vub300->vub_name);
			strncpy(vub300->vub_name,
				"SDIO transfer pseudocode download failed",
				sizeof(vub300->vub_name));
			return;
		}
	} else {
		dev_err(&vub300->udev->dev,
			"corrupt transfer pseudocode in firmware %s %s\n",
			fw->data, vub300->vub_name);
		strncpy(vub300->vub_name, "corrupt transfer pseudocode",
			sizeof(vub300->vub_name));
		return;
	}
	register_count += *data++;
	size -= 1;
	if (register_count * 4 == size) {
		int I = vub300->dynamic_register_count = register_count;
		int i = 0;
		while (I--) {
			unsigned int func_num = 0;
			vub300->sdio_register[i].func_num = *data++;
			size -= 1;
			func_num += *data++;
			size -= 1;
			func_num <<= 8;
			func_num += *data++;
			size -= 1;
			func_num <<= 8;
			func_num += *data++;
			size -= 1;
			vub300->sdio_register[i].sdio_reg = func_num;
			vub300->sdio_register[i].activate = 1;
			vub300->sdio_register[i].prepared = 0;
			i += 1;
		}
		dev_info(&vub300->udev->dev,
			 "initialized %d dynamic pseudocode registers\n",
			 vub300->dynamic_register_count);
		return;
	} else {
		dev_err(&vub300->udev->dev,
			"corrupt dynamic registers in firmware %s\n",
			vub300->vub_name);
		strncpy(vub300->vub_name, "corrupt dynamic registers",
			sizeof(vub300->vub_name));
		return;
	}
}

/*
 * if the binary containing the EMPTY PseudoCode can not be found
 * vub300->vub_name is set anyway in order to prevent an automatic retry
 */
static void download_offload_pseudocode(struct vub300_mmc_host *vub300)
{
	struct mmc_card *card = vub300->mmc->card;
	int sdio_funcs = card->sdio_funcs;
	const struct firmware *fw = NULL;
	int l = snprintf(vub300->vub_name, sizeof(vub300->vub_name),
			 "vub_%04X%04X", card->cis.vendor, card->cis.device);
	int n = 0;
	int retval;
	for (n = 0; n < sdio_funcs; n++) {
		struct sdio_func *sf = card->sdio_func[n];
		l += snprintf(vub300->vub_name + l,
			      sizeof(vub300->vub_name) - l, "_%04X%04X",
			      sf->vendor, sf->device);
	};
	snprintf(vub300->vub_name + l, sizeof(vub300->vub_name) - l, ".bin");
	dev_info(&vub300->udev->dev, "requesting offload firmware %s\n",
		 vub300->vub_name);
	retval = request_firmware(&fw, vub300->vub_name, &card->dev);
	if (retval < 0) {
		strncpy(vub300->vub_name, "vub_default.bin",
			sizeof(vub300->vub_name));
		retval = request_firmware(&fw, vub300->vub_name, &card->dev);
		if (retval < 0) {
			strncpy(vub300->vub_name,
				"no SDIO offload firmware found",
				sizeof(vub300->vub_name));
		} else {
			__download_offload_pseudocode(vub300, fw);
			release_firmware(fw);
		}
	} else {
		__download_offload_pseudocode(vub300, fw);
		release_firmware(fw);
	}
}

static void vub300_usb_bulk_msg_completion(struct urb *urb)
{				/* urb completion handler - hardirq */
	complete((struct completion *)urb->context);
}

static int vub300_usb_bulk_msg(struct vub300_mmc_host *vub300,
			       unsigned int pipe, void *data, int len,
			       int *actual_length, int timeout_msecs)
{
	/* cmd_mutex is held by vub300_cmndwork_thread */
	struct usb_device *usb_dev = vub300->udev;
	struct completion done;
	int retval;
	vub300->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!vub300->urb)
		return -ENOMEM;
	usb_fill_bulk_urb(vub300->urb, usb_dev, pipe, data, len,
			  vub300_usb_bulk_msg_completion, NULL);
	init_completion(&done);
	vub300->urb->context = &done;
	vub300->urb->actual_length = 0;
	retval = usb_submit_urb(vub300->urb, GFP_KERNEL);
	if (unlikely(retval))
		goto out;
	if (!wait_for_completion_timeout
	    (&done, msecs_to_jiffies(timeout_msecs))) {
		retval = -ETIMEDOUT;
		usb_kill_urb(vub300->urb);
	} else {
		retval = vub300->urb->status;
	}
out:
	*actual_length = vub300->urb->actual_length;
	usb_free_urb(vub300->urb);
	vub300->urb = NULL;
	return retval;
}

static int __command_read_data(struct vub300_mmc_host *vub300,
			       struct mmc_command *cmd, struct mmc_data *data)
{
	/* cmd_mutex is held by vub300_cmndwork_thread */
	int linear_length = vub300->datasize;
	int padded_length = vub300->large_usb_packets ?
		((511 + linear_length) >> 9) << 9 :
		((63 + linear_length) >> 6) << 6;
	if ((padded_length == linear_length) || !pad_input_to_usb_pkt) {
		int result;
		unsigned pipe;
		pipe = usb_rcvbulkpipe(vub300->udev, vub300->data_inp_ep);
		result = usb_sg_init(&vub300->sg_request, vub300->udev,
				     pipe, 0, data->sg,
				     data->sg_len, 0, GFP_KERNEL);
		if (result < 0) {
			usb_unlink_urb(vub300->command_out_urb);
			usb_unlink_urb(vub300->command_res_urb);
			cmd->error = result;
			data->bytes_xfered = 0;
			return 0;
		} else {
			vub300->sg_transfer_timer.expires =
				jiffies + msecs_to_jiffies(2000 +
						  (linear_length / 16384));
			add_timer(&vub300->sg_transfer_timer);
			usb_sg_wait(&vub300->sg_request);
			del_timer(&vub300->sg_transfer_timer);
			if (vub300->sg_request.status < 0) {
				cmd->error = vub300->sg_request.status;
				data->bytes_xfered = 0;
				return 0;
			} else {
				data->bytes_xfered = vub300->datasize;
				return linear_length;
			}
		}
	} else {
		u8 *buf = kmalloc(padded_length, GFP_KERNEL);
		if (buf) {
			int result;
			unsigned pipe = usb_rcvbulkpipe(vub300->udev,
							vub300->data_inp_ep);
			int actual_length = 0;
			result = vub300_usb_bulk_msg(vub300, pipe, buf,
					     padded_length, &actual_length,
					     2000 + (padded_length / 16384));
			if (result < 0) {
				cmd->error = result;
				data->bytes_xfered = 0;
				kfree(buf);
				return 0;
			} else if (actual_length < linear_length) {
				cmd->error = -EREMOTEIO;
				data->bytes_xfered = 0;
				kfree(buf);
				return 0;
			} else {
				sg_copy_from_buffer(data->sg, data->sg_len, buf,
						    linear_length);
				kfree(buf);
				data->bytes_xfered = vub300->datasize;
				return linear_length;
			}
		} else {
			cmd->error = -ENOMEM;
			data->bytes_xfered = 0;
			return 0;
		}
	}
}

static int __command_write_data(struct vub300_mmc_host *vub300,
				struct mmc_command *cmd, struct mmc_data *data)
{
	/* cmd_mutex is held by vub300_cmndwork_thread */
	unsigned pipe = usb_sndbulkpipe(vub300->udev, vub300->data_out_ep);
	int linear_length = vub300->datasize;
	int modulo_64_length = linear_length & 0x003F;
	int modulo_512_length = linear_length & 0x01FF;
	if (linear_length < 64) {
		int result;
		int actual_length;
		sg_copy_to_buffer(data->sg, data->sg_len,
				  vub300->padded_buffer,
				  sizeof(vub300->padded_buffer));
		memset(vub300->padded_buffer + linear_length, 0,
		       sizeof(vub300->padded_buffer) - linear_length);
		result = vub300_usb_bulk_msg(vub300, pipe, vub300->padded_buffer,
					     sizeof(vub300->padded_buffer),
					     &actual_length, 2000 +
					     (sizeof(vub300->padded_buffer) /
					      16384));
		if (result < 0) {
			cmd->error = result;
			data->bytes_xfered = 0;
		} else {
			data->bytes_xfered = vub300->datasize;
		}
	} else if ((!vub300->large_usb_packets && (0 < modulo_64_length)) ||
		    (vub300->large_usb_packets && (64 > modulo_512_length))
		) {		/* don't you just love these work-rounds */
		int padded_length = ((63 + linear_length) >> 6) << 6;
		u8 *buf = kmalloc(padded_length, GFP_KERNEL);
		if (buf) {
			int result;
			int actual_length;
			sg_copy_to_buffer(data->sg, data->sg_len, buf,
					  padded_length);
			memset(buf + linear_length, 0,
			       padded_length - linear_length);
			result =
				vub300_usb_bulk_msg(vub300, pipe, buf,
						    padded_length, &actual_length,
						    2000 + padded_length / 16384);
			kfree(buf);
			if (result < 0) {
				cmd->error = result;
				data->bytes_xfered = 0;
			} else {
				data->bytes_xfered = vub300->datasize;
			}
		} else {
			cmd->error = -ENOMEM;
			data->bytes_xfered = 0;
		}
	} else {		/* no data padding required */
		int result;
		unsigned char buf[64 * 4];
		sg_copy_to_buffer(data->sg, data->sg_len, buf, sizeof(buf));
		result = usb_sg_init(&vub300->sg_request, vub300->udev,
				     pipe, 0, data->sg,
				     data->sg_len, 0, GFP_KERNEL);
		if (result < 0) {
			usb_unlink_urb(vub300->command_out_urb);
			usb_unlink_urb(vub300->command_res_urb);
			cmd->error = result;
			data->bytes_xfered = 0;
		} else {
			vub300->sg_transfer_timer.expires =
				jiffies + msecs_to_jiffies(2000 +
							   linear_length / 16384);
			add_timer(&vub300->sg_transfer_timer);
			usb_sg_wait(&vub300->sg_request);
			if (cmd->error) {
				data->bytes_xfered = 0;
			} else {
				del_timer(&vub300->sg_transfer_timer);
				if (vub300->sg_request.status < 0) {
					cmd->error = vub300->sg_request.status;
					data->bytes_xfered = 0;
				} else {
					data->bytes_xfered = vub300->datasize;
				}
			}
		}
	}
	return linear_length;
}

static void __vub300_command_response(struct vub300_mmc_host *vub300,
				      struct mmc_command *cmd,
				      struct mmc_data *data, int data_length)
{
	/* cmd_mutex is held by vub300_cmndwork_thread */
	long respretval;
	int msec_timeout = 1000 + data_length / 4;
	respretval =
		wait_for_completion_timeout(&vub300->command_complete,
					    msecs_to_jiffies(msec_timeout));
	if (respretval == 0) { /* TIMED OUT */
		/* we don't know which of "out" and "res" if any failed */
		int result;
		vub300->usb_timed_out = 1;
		usb_kill_urb(vub300->command_out_urb);
		usb_kill_urb(vub300->command_res_urb);
		cmd->error = -ETIMEDOUT;
		result = usb_lock_device_for_reset(vub300->udev,
						   vub300->interface);
		if (result == 0) {
			result = usb_reset_device(vub300->udev);
			usb_unlock_device(vub300->udev);
		}
	} else if (respretval < 0) {
		/* we don't know which of "out" and "res" if any failed */
		usb_kill_urb(vub300->command_out_urb);
		usb_kill_urb(vub300->command_res_urb);
		cmd->error = respretval;
	} else if (cmd->error) {
		/*
		 * the error occurred sending the command
		 * or receiving the response
		 */
	} else if (vub300->command_out_urb->status) {
		vub300->usb_transport_fail = vub300->command_out_urb->status;
		cmd->error = -EPROTO == vub300->command_out_urb->status ?
			-ESHUTDOWN : vub300->command_out_urb->status;
	} else if (vub300->command_res_urb->status) {
		vub300->usb_transport_fail = vub300->command_res_urb->status;
		cmd->error = -EPROTO == vub300->command_res_urb->status ?
			-ESHUTDOWN : vub300->command_res_urb->status;
	} else if (vub300->resp.common.header_type == 0x00) {
		/*
		 * the command completed successfully
		 * and there was no piggybacked data
		 */
	} else if (vub300->resp.common.header_type == RESPONSE_ERROR) {
		cmd->error =
			vub300_response_error(vub300->resp.error.error_code);
		if (vub300->data)
			usb_sg_cancel(&vub300->sg_request);
	} else if (vub300->resp.common.header_type == RESPONSE_PIGGYBACKED) {
		int offloaded_data_length =
			vub300->resp.common.header_size -
			sizeof(struct sd_register_header);
		int register_count = offloaded_data_length >> 3;
		int ri = 0;
		while (register_count--) {
			add_offloaded_reg(vub300, &vub300->resp.pig.reg[ri]);
			ri += 1;
		}
		vub300->resp.common.header_size =
			sizeof(struct sd_register_header);
		vub300->resp.common.header_type = 0x00;
		cmd->error = 0;
	} else if (vub300->resp.common.header_type == RESPONSE_PIG_DISABLED) {
		int offloaded_data_length =
			vub300->resp.common.header_size -
			sizeof(struct sd_register_header);
		int register_count = offloaded_data_length >> 3;
		int ri = 0;
		while (register_count--) {
			add_offloaded_reg(vub300, &vub300->resp.pig.reg[ri]);
			ri += 1;
		}
		mutex_lock(&vub300->irq_mutex);
		if (vub300->irqs_queued) {
			vub300->irqs_queued += 1;
		} else if (vub300->irq_enabled) {
			vub300->irqs_queued += 1;
			vub300_queue_poll_work(vub300, 0);
		} else {
			vub300->irqs_queued += 1;
		}
		vub300->irq_disabled = 1;
		mutex_unlock(&vub300->irq_mutex);
		vub300->resp.common.header_size =
			sizeof(struct sd_register_header);
		vub300->resp.common.header_type = 0x00;
		cmd->error = 0;
	} else if (vub300->resp.common.header_type == RESPONSE_PIG_ENABLED) {
		int offloaded_data_length =
			vub300->resp.common.header_size -
			sizeof(struct sd_register_header);
		int register_count = offloaded_data_length >> 3;
		int ri = 0;
		while (register_count--) {
			add_offloaded_reg(vub300, &vub300->resp.pig.reg[ri]);
			ri += 1;
		}
		mutex_lock(&vub300->irq_mutex);
		if (vub300->irqs_queued) {
			vub300->irqs_queued += 1;
		} else if (vub300->irq_enabled) {
			vub300->irqs_queued += 1;
			vub300_queue_poll_work(vub300, 0);
		} else {
			vub300->irqs_queued += 1;
		}
		vub300->irq_disabled = 0;
		mutex_unlock(&vub300->irq_mutex);
		vub300->resp.common.header_size =
			sizeof(struct sd_register_header);
		vub300->resp.common.header_type = 0x00;
		cmd->error = 0;
	} else {
		cmd->error = -EINVAL;
	}
}

static void construct_request_response(struct vub300_mmc_host *vub300,
				       struct mmc_command *cmd)
{
	int resp_len = vub300->resp_len;
	int less_cmd = (17 == resp_len) ? resp_len : resp_len - 1;
	int bytes = 3 & less_cmd;
	int words = less_cmd >> 2;
	u8 *r = vub300->resp.response.command_response;
	if (bytes == 3) {
		cmd->resp[words] = (r[1 + (words << 2)] << 24)
			| (r[2 + (words << 2)] << 16)
			| (r[3 + (words << 2)] << 8);
	} else if (bytes == 2) {
		cmd->resp[words] = (r[1 + (words << 2)] << 24)
			| (r[2 + (words << 2)] << 16);
	} else if (bytes == 1) {
		cmd->resp[words] = (r[1 + (words << 2)] << 24);
	}
	while (words-- > 0) {
		cmd->resp[words] = (r[1 + (words << 2)] << 24)
			| (r[2 + (words << 2)] << 16)
			| (r[3 + (words << 2)] << 8)
			| (r[4 + (words << 2)] << 0);
	}
	if ((cmd->opcode == 53) && (0x000000FF & cmd->resp[0]))
		cmd->resp[0] &= 0xFFFFFF00;
}

/* this thread runs only when there is an upper level command req outstanding */
static void vub300_cmndwork_thread(struct work_struct *work)
{
	struct vub300_mmc_host *vub300 =
		container_of(work, struct vub300_mmc_host, cmndwork);
	if (!vub300->interface) {
		kref_put(&vub300->kref, vub300_delete);
		return;
	} else {
		struct mmc_request *req = vub300->req;
		struct mmc_command *cmd = vub300->cmd;
		struct mmc_data *data = vub300->data;
		int data_length;
		mutex_lock(&vub300->cmd_mutex);
		init_completion(&vub300->command_complete);
		if (likely(vub300->vub_name[0]) || !vub300->mmc->card ||
		    !mmc_card_present(vub300->mmc->card)) {
			/*
			 * the name of the EMPTY Pseudo firmware file
			 * is used as a flag to indicate that the file
			 * has been already downloaded to the VUB300 chip
			 */
		} else if (0 == vub300->mmc->card->sdio_funcs) {
			strncpy(vub300->vub_name, "SD memory device",
				sizeof(vub300->vub_name));
		} else {
			download_offload_pseudocode(vub300);
		}
		send_command(vub300);
		if (!data)
			data_length = 0;
		else if (MMC_DATA_READ & data->flags)
			data_length = __command_read_data(vub300, cmd, data);
		else
			data_length = __command_write_data(vub300, cmd, data);
		__vub300_command_response(vub300, cmd, data, data_length);
		vub300->req = NULL;
		vub300->cmd = NULL;
		vub300->data = NULL;
		if (cmd->error) {
			if (cmd->error == -ENOMEDIUM)
				check_vub300_port_status(vub300);
			mutex_unlock(&vub300->cmd_mutex);
			mmc_request_done(vub300->mmc, req);
			kref_put(&vub300->kref, vub300_delete);
			return;
		} else {
			construct_request_response(vub300, cmd);
			vub300->resp_len = 0;
			mutex_unlock(&vub300->cmd_mutex);
			kref_put(&vub300->kref, vub300_delete);
			mmc_request_done(vub300->mmc, req);
			return;
		}
	}
}

static int examine_cyclic_buffer(struct vub300_mmc_host *vub300,
				 struct mmc_command *cmd, u8 Function)
{
	/* cmd_mutex is held by vub300_mmc_request */
	u8 cmd0 = 0xFF & (cmd->arg >> 24);
	u8 cmd1 = 0xFF & (cmd->arg >> 16);
	u8 cmd2 = 0xFF & (cmd->arg >> 8);
	u8 cmd3 = 0xFF & (cmd->arg >> 0);
	int first = MAXREGMASK & vub300->fn[Function].offload_point;
	struct offload_registers_access *rf = &vub300->fn[Function].reg[first];
	if (cmd0 == rf->command_byte[0] &&
	    cmd1 == rf->command_byte[1] &&
	    cmd2 == rf->command_byte[2] &&
	    cmd3 == rf->command_byte[3]) {
		u8 checksum = 0x00;
		cmd->resp[1] = checksum << 24;
		cmd->resp[0] = (rf->Respond_Byte[0] << 24)
			| (rf->Respond_Byte[1] << 16)
			| (rf->Respond_Byte[2] << 8)
			| (rf->Respond_Byte[3] << 0);
		vub300->fn[Function].offload_point += 1;
		vub300->fn[Function].offload_count -= 1;
		vub300->total_offload_count -= 1;
		return 1;
	} else {
		int delta = 1;	/* because it does not match the first one */
		u8 register_count = vub300->fn[Function].offload_count - 1;
		u32 register_point = vub300->fn[Function].offload_point + 1;
		while (0 < register_count) {
			int point = MAXREGMASK & register_point;
			struct offload_registers_access *r =
				&vub300->fn[Function].reg[point];
			if (cmd0 == r->command_byte[0] &&
			    cmd1 == r->command_byte[1] &&
			    cmd2 == r->command_byte[2] &&
			    cmd3 == r->command_byte[3]) {
				u8 checksum = 0x00;
				cmd->resp[1] = checksum << 24;
				cmd->resp[0] = (r->Respond_Byte[0] << 24)
					| (r->Respond_Byte[1] << 16)
					| (r->Respond_Byte[2] << 8)
					| (r->Respond_Byte[3] << 0);
				vub300->fn[Function].offload_point += delta;
				vub300->fn[Function].offload_count -= delta;
				vub300->total_offload_count -= delta;
				return 1;
			} else {
				register_point += 1;
				register_count -= 1;
				delta += 1;
				continue;
			}
		}
		return 0;
	}
}

static int satisfy_request_from_offloaded_data(struct vub300_mmc_host *vub300,
					       struct mmc_command *cmd)
{
	/* cmd_mutex is held by vub300_mmc_request */
	u8 regs = vub300->dynamic_register_count;
	u8 i = 0;
	u8 func = FUN(cmd);
	u32 reg = REG(cmd);
	while (0 < regs--) {
		if ((vub300->sdio_register[i].func_num == func) &&
		    (vub300->sdio_register[i].sdio_reg == reg)) {
			if (!vub300->sdio_register[i].prepared) {
				return 0;
			} else if ((0x80000000 & cmd->arg) == 0x80000000) {
				/*
				 * a write to a dynamic register
				 * nullifies our offloaded value
				 */
				vub300->sdio_register[i].prepared = 0;
				return 0;
			} else {
				u8 checksum = 0x00;
				u8 rsp0 = 0x00;
				u8 rsp1 = 0x00;
				u8 rsp2 = vub300->sdio_register[i].response;
				u8 rsp3 = vub300->sdio_register[i].regvalue;
				vub300->sdio_register[i].prepared = 0;
				cmd->resp[1] = checksum << 24;
				cmd->resp[0] = (rsp0 << 24)
					| (rsp1 << 16)
					| (rsp2 << 8)
					| (rsp3 << 0);
				return 1;
			}
		} else {
			i += 1;
			continue;
		}
	};
	if (vub300->total_offload_count == 0)
		return 0;
	else if (vub300->fn[func].offload_count == 0)
		return 0;
	else
		return examine_cyclic_buffer(vub300, cmd, func);
}

static void vub300_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
{				/* NOT irq */
	struct mmc_command *cmd = req->cmd;
	struct vub300_mmc_host *vub300 = mmc_priv(mmc);
	if (!vub300->interface) {
		cmd->error = -ESHUTDOWN;
		mmc_request_done(mmc, req);
		return;
	} else {
		struct mmc_data *data = req->data;
		if (!vub300->card_powered) {
			cmd->error = -ENOMEDIUM;
			mmc_request_done(mmc, req);
			return;
		}
		if (!vub300->card_present) {
			cmd->error = -ENOMEDIUM;
			mmc_request_done(mmc, req);
			return;
		}
		if (vub300->usb_transport_fail) {
			cmd->error = vub300->usb_transport_fail;
			mmc_request_done(mmc, req);
			return;
		}
		if (!vub300->interface) {
			cmd->error = -ENODEV;
			mmc_request_done(mmc, req);
			return;
		}
		kref_get(&vub300->kref);
		mutex_lock(&vub300->cmd_mutex);
		mod_timer(&vub300->inactivity_timer, jiffies + HZ);
		/*
		 * for performance we have to return immediately
		 * if the requested data has been offloaded
		 */
		if (cmd->opcode == 52 &&
		    satisfy_request_from_offloaded_data(vub300, cmd)) {
			cmd->error = 0;
			mutex_unlock(&vub300->cmd_mutex);
			kref_put(&vub300->kref, vub300_delete);
			mmc_request_done(mmc, req);
			return;
		} else {
			vub300->cmd = cmd;
			vub300->req = req;
			vub300->data = data;
			if (data)
				vub300->datasize = data->blksz * data->blocks;
			else
				vub300->datasize = 0;
			vub300_queue_cmnd_work(vub300);
			mutex_unlock(&vub300->cmd_mutex);
			kref_put(&vub300->kref, vub300_delete);
			/*
			 * the kernel lock diagnostics complain
			 * if the cmd_mutex * is "passed on"
			 * to the cmndwork thread,
			 * so we must release it now
			 * and re-acquire it in the cmndwork thread
			 */
		}
	}
}

static void __set_clock_speed(struct vub300_mmc_host *vub300, u8 buf[8],
			      struct mmc_ios *ios)
{
	int buf_array_size = 8; /* ARRAY_SIZE(buf) does not work !!! */
	int retval;
	u32 kHzClock;
	if (ios->clock >= 48000000)
		kHzClock = 48000;
	else if (ios->clock >= 24000000)
		kHzClock = 24000;
	else if (ios->clock >= 20000000)
		kHzClock = 20000;
	else if (ios->clock >= 15000000)
		kHzClock = 15000;
	else if (ios->clock >= 200000)
		kHzClock = 200;
	else
		kHzClock = 0;
	{
		int i;
		u64 c = kHzClock;
		for (i = 0; i < buf_array_size; i++) {
			buf[i] = c;
			c >>= 8;
		}
	}
	retval =
		usb_control_msg(vub300->udev, usb_sndctrlpipe(vub300->udev, 0),
				SET_CLOCK_SPEED,
				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				0x00, 0x00, buf, buf_array_size, HZ);
	if (retval != 8) {
		dev_err(&vub300->udev->dev, "SET_CLOCK_SPEED"
			" %dkHz failed with retval=%d\n", kHzClock, retval);
	} else {
		dev_dbg(&vub300->udev->dev, "SET_CLOCK_SPEED"
			" %dkHz\n", kHzClock);
	}
}

static void vub300_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{				/* NOT irq */
	struct vub300_mmc_host *vub300 = mmc_priv(mmc);
	if (!vub300->interface)
		return;
	kref_get(&vub300->kref);
	mutex_lock(&vub300->cmd_mutex);
	if ((ios->power_mode == MMC_POWER_OFF) && vub300->card_powered) {
		vub300->card_powered = 0;
		usb_control_msg(vub300->udev, usb_sndctrlpipe(vub300->udev, 0),
				SET_SD_POWER,
				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				0x0000, 0x0000, NULL, 0, HZ);
		/* must wait for the VUB300 u-proc to boot up */
		msleep(600);
	} else if ((ios->power_mode == MMC_POWER_UP) && !vub300->card_powered) {
		usb_control_msg(vub300->udev, usb_sndctrlpipe(vub300->udev, 0),
				SET_SD_POWER,
				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				0x0001, 0x0000, NULL, 0, HZ);
		msleep(600);
		vub300->card_powered = 1;
	} else if (ios->power_mode == MMC_POWER_ON) {
		u8 *buf = kmalloc(8, GFP_KERNEL);
		if (buf) {
			__set_clock_speed(vub300, buf, ios);
			kfree(buf);
		}
	} else {
		/* this should mean no change of state */
	}
	mutex_unlock(&vub300->cmd_mutex);
	kref_put(&vub300->kref, vub300_delete);
}

static int vub300_mmc_get_ro(struct mmc_host *mmc)
{
	struct vub300_mmc_host *vub300 = mmc_priv(mmc);
	return vub300->read_only;
}

static void vub300_enable_sdio_irq(struct mmc_host *mmc, int enable)
{				/* NOT irq */
	struct vub300_mmc_host *vub300 = mmc_priv(mmc);
	if (!vub300->interface)
		return;
	kref_get(&vub300->kref);
	if (enable) {
		mutex_lock(&vub300->irq_mutex);
		if (vub300->irqs_queued) {
			vub300->irqs_queued -= 1;
			mmc_signal_sdio_irq(vub300->mmc);
		} else if (vub300->irq_disabled) {
			vub300->irq_disabled = 0;
			vub300->irq_enabled = 1;
			vub300_queue_poll_work(vub300, 0);
		} else if (vub300->irq_enabled) {
			/* this should not happen, so we will just ignore it */
		} else {
			vub300->irq_enabled = 1;
			vub300_queue_poll_work(vub300, 0);
		}
		mutex_unlock(&vub300->irq_mutex);
	} else {
		vub300->irq_enabled = 0;
	}
	kref_put(&vub300->kref, vub300_delete);
}

void vub300_init_card(struct mmc_host *mmc, struct mmc_card *card)
{				/* NOT irq */
	struct vub300_mmc_host *vub300 = mmc_priv(mmc);
	dev_info(&vub300->udev->dev, "NO host QUIRKS for this card\n");
}

static struct mmc_host_ops vub300_mmc_ops = {
	.request = vub300_mmc_request,
	.set_ios = vub300_mmc_set_ios,
	.get_ro = vub300_mmc_get_ro,
	.enable_sdio_irq = vub300_enable_sdio_irq,
	.init_card = vub300_init_card,
};

static int vub300_probe(struct usb_interface *interface,
			const struct usb_device_id *id)
{				/* NOT irq */
	struct vub300_mmc_host *vub300;
	struct usb_host_interface *iface_desc;
	struct usb_device *udev = usb_get_dev(interface_to_usbdev(interface));
	int i;
	int retval = -ENOMEM;
	struct urb *command_out_urb;
	struct urb *command_res_urb;
	struct mmc_host *mmc;
	char manufacturer[48];
	char product[32];
	char serial_number[32];
	usb_string(udev, udev->descriptor.iManufacturer, manufacturer,
		   sizeof(manufacturer));
	usb_string(udev, udev->descriptor.iProduct, product, sizeof(product));
	usb_string(udev, udev->descriptor.iSerialNumber, serial_number,
		   sizeof(serial_number));
	dev_info(&udev->dev, "probing VID:PID(%04X:%04X) %s %s %s\n",
		 udev->descriptor.idVendor, udev->descriptor.idProduct,
		 manufacturer, product, serial_number);
	command_out_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!command_out_urb) {
		retval = -ENOMEM;
		dev_err(&udev->dev, "not enough memory for command_out_urb\n");
		goto error0;
	}
	command_res_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!command_res_urb) {
		retval = -ENOMEM;
		dev_err(&udev->dev, "not enough memory for command_res_urb\n");
		goto error1;
	}
	/* this also allocates memory for our VUB300 mmc host device */
	mmc = mmc_alloc_host(sizeof(struct vub300_mmc_host), &udev->dev);
	if (!mmc) {
		retval = -ENOMEM;
		dev_err(&udev->dev, "not enough memory for the mmc_host\n");
		goto error4;
	}
	/* MMC core transfer sizes tunable parameters */
	mmc->caps = 0;
	if (!force_1_bit_data_xfers)
		mmc->caps |= MMC_CAP_4_BIT_DATA;
	if (!force_polling_for_irqs)
		mmc->caps |= MMC_CAP_SDIO_IRQ;
	mmc->caps &= ~MMC_CAP_NEEDS_POLL;
	/*
	 * MMC_CAP_NEEDS_POLL causes core.c:mmc_rescan() to poll
	 * for devices which results in spurious CMD7's being
	 * issued which stops some SDIO cards from working
	 */
	if (limit_speed_to_24_MHz) {
		mmc->caps |= MMC_CAP_MMC_HIGHSPEED;
		mmc->caps |= MMC_CAP_SD_HIGHSPEED;
		mmc->f_max = 24000000;
		dev_info(&udev->dev, "limiting SDIO speed to 24_MHz\n");
	} else {
		mmc->caps |= MMC_CAP_MMC_HIGHSPEED;
		mmc->caps |= MMC_CAP_SD_HIGHSPEED;
		mmc->f_max = 48000000;
	}
	mmc->f_min = 200000;
	mmc->max_blk_count = 511;
	mmc->max_blk_size = 512;
	mmc->max_segs = 128;
	if (force_max_req_size)
		mmc->max_req_size = force_max_req_size * 1024;
	else
		mmc->max_req_size = 64 * 1024;
	mmc->max_seg_size = mmc->max_req_size;
	mmc->ocr_avail = 0;
	mmc->ocr_avail |= MMC_VDD_165_195;
	mmc->ocr_avail |= MMC_VDD_20_21;
	mmc->ocr_avail |= MMC_VDD_21_22;
	mmc->ocr_avail |= MMC_VDD_22_23;
	mmc->ocr_avail |= MMC_VDD_23_24;
	mmc->ocr_avail |= MMC_VDD_24_25;
	mmc->ocr_avail |= MMC_VDD_25_26;
	mmc->ocr_avail |= MMC_VDD_26_27;
	mmc->ocr_avail |= MMC_VDD_27_28;
	mmc->ocr_avail |= MMC_VDD_28_29;
	mmc->ocr_avail |= MMC_VDD_29_30;
	mmc->ocr_avail |= MMC_VDD_30_31;
	mmc->ocr_avail |= MMC_VDD_31_32;
	mmc->ocr_avail |= MMC_VDD_32_33;
	mmc->ocr_avail |= MMC_VDD_33_34;
	mmc->ocr_avail |= MMC_VDD_34_35;
	mmc->ocr_avail |= MMC_VDD_35_36;
	mmc->ops = &vub300_mmc_ops;
	vub300 = mmc_priv(mmc);
	vub300->mmc = mmc;
	vub300->card_powered = 0;
	vub300->bus_width = 0;
	vub300->cmnd.head.block_size[0] = 0x00;
	vub300->cmnd.head.block_size[1] = 0x00;
	vub300->app_spec = 0;
	mutex_init(&vub300->cmd_mutex);
	mutex_init(&vub300->irq_mutex);
	vub300->command_out_urb = command_out_urb;
	vub300->command_res_urb = command_res_urb;
	vub300->usb_timed_out = 0;
	vub300->dynamic_register_count = 0;

	for (i = 0; i < ARRAY_SIZE(vub300->fn); i++) {
		vub300->fn[i].offload_point = 0;
		vub300->fn[i].offload_count = 0;
	}

	vub300->total_offload_count = 0;
	vub300->irq_enabled = 0;
	vub300->irq_disabled = 0;
	vub300->irqs_queued = 0;

	for (i = 0; i < ARRAY_SIZE(vub300->sdio_register); i++)
		vub300->sdio_register[i++].activate = 0;

	vub300->udev = udev;
	vub300->interface = interface;
	vub300->cmnd_res_ep = 0;
	vub300->cmnd_out_ep = 0;
	vub300->data_inp_ep = 0;
	vub300->data_out_ep = 0;

	for (i = 0; i < ARRAY_SIZE(vub300->fbs); i++)
		vub300->fbs[i] = 512;

	/*
	 *      set up the endpoint information
	 *
	 * use the first pair of bulk-in and bulk-out
	 *     endpoints for Command/Response+Interrupt
	 *
	 * use the second pair of bulk-in and bulk-out
	 *     endpoints for Data In/Out
	 */
	vub300->large_usb_packets = 0;
	iface_desc = interface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		struct usb_endpoint_descriptor *endpoint =
			&iface_desc->endpoint[i].desc;
		dev_info(&vub300->udev->dev,
			 "vub300 testing %s EndPoint(%d) %02X\n",
			 usb_endpoint_is_bulk_in(endpoint) ? "BULK IN" :
			 usb_endpoint_is_bulk_out(endpoint) ? "BULK OUT" :
			 "UNKNOWN", i, endpoint->bEndpointAddress);
		if (endpoint->wMaxPacketSize > 64)
			vub300->large_usb_packets = 1;
		if (usb_endpoint_is_bulk_in(endpoint)) {
			if (!vub300->cmnd_res_ep) {
				vub300->cmnd_res_ep =
					endpoint->bEndpointAddress;
			} else if (!vub300->data_inp_ep) {
				vub300->data_inp_ep =
					endpoint->bEndpointAddress;
			} else {
				dev_warn(&vub300->udev->dev,
					 "ignoring"
					 " unexpected bulk_in endpoint");
			}
		} else if (usb_endpoint_is_bulk_out(endpoint)) {
			if (!vub300->cmnd_out_ep) {
				vub300->cmnd_out_ep =
					endpoint->bEndpointAddress;
			} else if (!vub300->data_out_ep) {
				vub300->data_out_ep =
					endpoint->bEndpointAddress;
			} else {
				dev_warn(&vub300->udev->dev,
					 "ignoring"
					 " unexpected bulk_out endpoint");
			}
		} else {
			dev_warn(&vub300->udev->dev,
				 "vub300 ignoring EndPoint(%d) %02X", i,
				 endpoint->bEndpointAddress);
		}
	}
	if (vub300->cmnd_res_ep && vub300->cmnd_out_ep &&
	    vub300->data_inp_ep && vub300->data_out_ep) {
		dev_info(&vub300->udev->dev,
			 "vub300 %s packets"
			 " using EndPoints %02X %02X %02X %02X\n",
			 vub300->large_usb_packets ? "LARGE" : "SMALL",
			 vub300->cmnd_out_ep, vub300->cmnd_res_ep,
			 vub300->data_out_ep, vub300->data_inp_ep);
		/* we have the expected EndPoints */
	} else {
		dev_err(&vub300->udev->dev,
		    "Could not find two sets of bulk-in/out endpoint pairs\n");
		retval = -EINVAL;
		goto error5;
	}
	retval =
		usb_control_msg(vub300->udev, usb_rcvctrlpipe(vub300->udev, 0),
				GET_HC_INF0,
				USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				0x0000, 0x0000, &vub300->hc_info,
				sizeof(vub300->hc_info), HZ);
	if (retval < 0)
		goto error5;
	retval =
		usb_control_msg(vub300->udev, usb_rcvctrlpipe(vub300->udev, 0),
				SET_ROM_WAIT_STATES,
				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				firmware_rom_wait_states, 0x0000, NULL, 0, HZ);
	if (retval < 0)
		goto error5;
	dev_info(&vub300->udev->dev,
		 "operating_mode = %s %s %d MHz %s %d byte USB packets\n",
		 (mmc->caps & MMC_CAP_SDIO_IRQ) ? "IRQs" : "POLL",
		 (mmc->caps & MMC_CAP_4_BIT_DATA) ? "4-bit" : "1-bit",
		 mmc->f_max / 1000000,
		 pad_input_to_usb_pkt ? "padding input data to" : "with",
		 vub300->large_usb_packets ? 512 : 64);
	retval =
		usb_control_msg(vub300->udev, usb_rcvctrlpipe(vub300->udev, 0),
				GET_SYSTEM_PORT_STATUS,
				USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				0x0000, 0x0000, &vub300->system_port_status,
				sizeof(vub300->system_port_status), HZ);
	if (retval < 0) {
		goto error4;
	} else if (sizeof(vub300->system_port_status) == retval) {
		vub300->card_present =
			(0x0001 & vub300->system_port_status.port_flags) ? 1 : 0;
		vub300->read_only =
			(0x0010 & vub300->system_port_status.port_flags) ? 1 : 0;
	} else {
		goto error4;
	}
	usb_set_intfdata(interface, vub300);
	INIT_DELAYED_WORK(&vub300->pollwork, vub300_pollwork_thread);
	INIT_WORK(&vub300->cmndwork, vub300_cmndwork_thread);
	INIT_WORK(&vub300->deadwork, vub300_deadwork_thread);
	kref_init(&vub300->kref);
	init_timer(&vub300->sg_transfer_timer);
	vub300->sg_transfer_timer.data = (unsigned long)vub300;
	vub300->sg_transfer_timer.function = vub300_sg_timed_out;
	kref_get(&vub300->kref);
	init_timer(&vub300->inactivity_timer);
	vub300->inactivity_timer.data = (unsigned long)vub300;
	vub300->inactivity_timer.function = vub300_inactivity_timer_expired;
	vub300->inactivity_timer.expires = jiffies + HZ;
	add_timer(&vub300->inactivity_timer);
	if (vub300->card_present)
		dev_info(&vub300->udev->dev,
			 "USB vub300 remote SDIO host controller[%d]"
			 "connected with SD/SDIO card inserted\n",
			 interface_to_InterfaceNumber(interface));
	else
		dev_info(&vub300->udev->dev,
			 "USB vub300 remote SDIO host controller[%d]"
			 "connected with no SD/SDIO card inserted\n",
			 interface_to_InterfaceNumber(interface));
	mmc_add_host(mmc);
	return 0;
error5:
	mmc_free_host(mmc);
	/*
	 * and hence also frees vub300
	 * which is contained at the end of struct mmc
	 */
error4:
	usb_free_urb(command_out_urb);
error1:
	usb_free_urb(command_res_urb);
error0:
	return retval;
}

static void vub300_disconnect(struct usb_interface *interface)
{				/* NOT irq */
	struct vub300_mmc_host *vub300 = usb_get_intfdata(interface);
	if (!vub300 || !vub300->mmc) {
		return;
	} else {
		struct mmc_host *mmc = vub300->mmc;
		if (!vub300->mmc) {
			return;
		} else {
			int ifnum = interface_to_InterfaceNumber(interface);
			usb_set_intfdata(interface, NULL);
			/* prevent more I/O from starting */
			vub300->interface = NULL;
			kref_put(&vub300->kref, vub300_delete);
			mmc_remove_host(mmc);
			pr_info("USB vub300 remote SDIO host controller[%d]"
				" now disconnected", ifnum);
			return;
		}
	}
}

#ifdef CONFIG_PM
static int vub300_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct vub300_mmc_host *vub300 = usb_get_intfdata(intf);
	if (!vub300 || !vub300->mmc) {
		return 0;
	} else {
		struct mmc_host *mmc = vub300->mmc;
		mmc_suspend_host(mmc);
		return 0;
	}
}

static int vub300_resume(struct usb_interface *intf)
{
	struct vub300_mmc_host *vub300 = usb_get_intfdata(intf);
	if (!vub300 || !vub300->mmc) {
		return 0;
	} else {
		struct mmc_host *mmc = vub300->mmc;
		mmc_resume_host(mmc);
		return 0;
	}
}
#else
#define vub300_suspend NULL
#define vub300_resume NULL
#endif
static int vub300_pre_reset(struct usb_interface *intf)
{				/* NOT irq */
	struct vub300_mmc_host *vub300 = usb_get_intfdata(intf);
	mutex_lock(&vub300->cmd_mutex);
	return 0;
}

static int vub300_post_reset(struct usb_interface *intf)
{				/* NOT irq */
	struct vub300_mmc_host *vub300 = usb_get_intfdata(intf);
	/* we are sure no URBs are active - no locking needed */
	vub300->errors = -EPIPE;
	mutex_unlock(&vub300->cmd_mutex);
	return 0;
}

static struct usb_driver vub300_driver = {
	.name = "vub300",
	.probe = vub300_probe,
	.disconnect = vub300_disconnect,
	.suspend = vub300_suspend,
	.resume = vub300_resume,
	.pre_reset = vub300_pre_reset,
	.post_reset = vub300_post_reset,
	.id_table = vub300_table,
	.supports_autosuspend = 1,
};

static int __init vub300_init(void)
{				/* NOT irq */
	int result;

	pr_info("VUB300 Driver rom wait states = %02X irqpoll timeout = %04X",
		firmware_rom_wait_states, 0x0FFFF & firmware_irqpoll_timeout);
	cmndworkqueue = create_singlethread_workqueue("kvub300c");
	if (!cmndworkqueue) {
		pr_err("not enough memory for the REQUEST workqueue");
		result = -ENOMEM;
		goto out1;
	}
	pollworkqueue = create_singlethread_workqueue("kvub300p");
	if (!pollworkqueue) {
		pr_err("not enough memory for the IRQPOLL workqueue");
		result = -ENOMEM;
		goto out2;
	}
	deadworkqueue = create_singlethread_workqueue("kvub300d");
	if (!deadworkqueue) {
		pr_err("not enough memory for the EXPIRED workqueue");
		result = -ENOMEM;
		goto out3;
	}
	result = usb_register(&vub300_driver);
	if (result) {
		pr_err("usb_register failed. Error number %d", result);
		goto out4;
	}
	return 0;
out4:
	destroy_workqueue(deadworkqueue);
out3:
	destroy_workqueue(pollworkqueue);
out2:
	destroy_workqueue(cmndworkqueue);
out1:
	return result;
}

static void __exit vub300_exit(void)
{
	usb_deregister(&vub300_driver);
	flush_workqueue(cmndworkqueue);
	flush_workqueue(pollworkqueue);
	flush_workqueue(deadworkqueue);
	destroy_workqueue(cmndworkqueue);
	destroy_workqueue(pollworkqueue);
	destroy_workqueue(deadworkqueue);
}

module_init(vub300_init);
module_exit(vub300_exit);

MODULE_AUTHOR("Tony Olech <tony.olech@elandigitalsystems.com>");
MODULE_DESCRIPTION("VUB300 USB to SD/MMC/SDIO adapter driver");
MODULE_LICENSE("GPL");