summaryrefslogtreecommitdiff
path: root/drivers/block/ataflop.c
blob: ae596e55bcb67c18594477b7f8b27ec02d82fcc6 (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
/*
 *  drivers/block/ataflop.c
 *
 *  Copyright (C) 1993  Greg Harp
 *  Atari Support by Bjoern Brauel, Roman Hodek
 *
 *  Big cleanup Sep 11..14 1994 Roman Hodek:
 *   - Driver now works interrupt driven
 *   - Support for two drives; should work, but I cannot test that :-(
 *   - Reading is done in whole tracks and buffered to speed up things
 *   - Disk change detection and drive deselecting after motor-off
 *     similar to TOS
 *   - Autodetection of disk format (DD/HD); untested yet, because I
 *     don't have an HD drive :-(
 *
 *  Fixes Nov 13 1994 Martin Schaller:
 *   - Autodetection works now
 *   - Support for 5 1/4'' disks
 *   - Removed drive type (unknown on atari)
 *   - Do seeks with 8 Mhz
 *
 *  Changes by Andreas Schwab:
 *   - After errors in multiple read mode try again reading single sectors
 *  (Feb 1995):
 *   - Clean up error handling
 *   - Set blk_size for proper size checking
 *   - Initialize track register when testing presence of floppy
 *   - Implement some ioctl's
 *
 *  Changes by Torsten Lang:
 *   - When probing the floppies we should add the FDCCMDADD_H flag since
 *     the FDC will otherwise wait forever when no disk is inserted...
 *
 * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa:
 *  - MFPDELAY() after each FDC access -> atari 
 *  - more/other disk formats
 *  - DMA to the block buffer directly if we have a 32bit DMA
 *  - for medusa, the step rate is always 3ms
 *  - on medusa, use only cache_push()
 * Roman:
 *  - Make disk format numbering independent from minors
 *  - Let user set max. supported drive type (speeds up format
 *    detection, saves buffer space)
 *
 * Roman 10/15/95:
 *  - implement some more ioctls
 *  - disk formatting
 *  
 * Andreas 95/12/12:
 *  - increase gap size at start of track for HD/ED disks
 *
 * Michael (MSch) 11/07/96:
 *  - implemented FDSETPRM and FDDEFPRM ioctl
 *
 * Andreas (97/03/19):
 *  - implemented missing BLK* ioctls
 *
 *  Things left to do:
 *   - Formatting
 *   - Maybe a better strategy for disk change detection (does anyone
 *     know one?)
 */

#include <linux/module.h>

#include <linux/fd.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include <linux/completion.h>
#include <linux/wait.h>

#include <asm/atafd.h>
#include <asm/atafdreg.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>
#include <asm/atari_stram.h>

#define	FD_MAX_UNITS 2

#undef DEBUG

static DEFINE_MUTEX(ataflop_mutex);
static struct request *fd_request;
static int fdc_queue;

/* Disk types: DD, HD, ED */
static struct atari_disk_type {
	const char	*name;
	unsigned	spt;		/* sectors per track */
	unsigned	blocks;		/* total number of blocks */
	unsigned	fdc_speed;	/* fdc_speed setting */
	unsigned 	stretch;	/* track doubling ? */
} atari_disk_type[] = {
	{ "d360",  9, 720, 0, 0},	/*  0: 360kB diskette */
	{ "D360",  9, 720, 0, 1},	/*  1: 360kb in 720k or 1.2MB drive */
	{ "D720",  9,1440, 0, 0},	/*  2: 720kb in 720k or 1.2MB drive */
	{ "D820", 10,1640, 0, 0},	/*  3: DD disk with 82 tracks/10 sectors */
/* formats above are probed for type DD */
#define	MAX_TYPE_DD 3
	{ "h1200",15,2400, 3, 0},	/*  4: 1.2MB diskette */
	{ "H1440",18,2880, 3, 0},	/*  5: 1.4 MB diskette (HD) */
	{ "H1640",20,3280, 3, 0},	/*  6: 1.64MB diskette (fat HD) 82 tr 20 sec */
/* formats above are probed for types DD and HD */
#define	MAX_TYPE_HD 6
	{ "E2880",36,5760, 3, 0},	/*  7: 2.8 MB diskette (ED) */
	{ "E3280",40,6560, 3, 0},	/*  8: 3.2 MB diskette (fat ED) 82 tr 40 sec */
/* formats above are probed for types DD, HD and ED */
#define	MAX_TYPE_ED 8
/* types below are never autoprobed */
	{ "H1680",21,3360, 3, 0},	/*  9: 1.68MB diskette (fat HD) 80 tr 21 sec */
	{ "h410",10,820, 0, 1},		/* 10: 410k diskette 41 tr 10 sec, stretch */
	{ "h1476",18,2952, 3, 0},	/* 11: 1.48MB diskette 82 tr 18 sec */
	{ "H1722",21,3444, 3, 0},	/* 12: 1.72MB diskette 82 tr 21 sec */
	{ "h420",10,840, 0, 1},		/* 13: 420k diskette 42 tr 10 sec, stretch */
	{ "H830",10,1660, 0, 0},	/* 14: 820k diskette 83 tr 10 sec */
	{ "h1494",18,2952, 3, 0},	/* 15: 1.49MB diskette 83 tr 18 sec */
	{ "H1743",21,3486, 3, 0},	/* 16: 1.74MB diskette 83 tr 21 sec */
	{ "h880",11,1760, 0, 0},	/* 17: 880k diskette 80 tr 11 sec */
	{ "D1040",13,2080, 0, 0},	/* 18: 1.04MB diskette 80 tr 13 sec */
	{ "D1120",14,2240, 0, 0},	/* 19: 1.12MB diskette 80 tr 14 sec */
	{ "h1600",20,3200, 3, 0},	/* 20: 1.60MB diskette 80 tr 20 sec */
	{ "H1760",22,3520, 3, 0},	/* 21: 1.76MB diskette 80 tr 22 sec */
	{ "H1920",24,3840, 3, 0},	/* 22: 1.92MB diskette 80 tr 24 sec */
	{ "E3200",40,6400, 3, 0},	/* 23: 3.2MB diskette 80 tr 40 sec */
	{ "E3520",44,7040, 3, 0},	/* 24: 3.52MB diskette 80 tr 44 sec */
	{ "E3840",48,7680, 3, 0},	/* 25: 3.84MB diskette 80 tr 48 sec */
	{ "H1840",23,3680, 3, 0},	/* 26: 1.84MB diskette 80 tr 23 sec */
	{ "D800",10,1600, 0, 0},	/* 27: 800k diskette 80 tr 10 sec */
};

static int StartDiskType[] = {
	MAX_TYPE_DD,
	MAX_TYPE_HD,
	MAX_TYPE_ED
};

#define	TYPE_DD		0
#define	TYPE_HD		1
#define	TYPE_ED		2

static int DriveType = TYPE_HD;

static DEFINE_SPINLOCK(ataflop_lock);

/* Array for translating minors into disk formats */
static struct {
	int 	 index;
	unsigned drive_types;
} minor2disktype[] = {
	{  0, TYPE_DD },	/*  1: d360 */
	{  4, TYPE_HD },	/*  2: h1200 */
	{  1, TYPE_DD },	/*  3: D360 */
	{  2, TYPE_DD },	/*  4: D720 */
	{  1, TYPE_DD },	/*  5: h360 = D360 */
	{  2, TYPE_DD },	/*  6: h720 = D720 */
	{  5, TYPE_HD },	/*  7: H1440 */
	{  7, TYPE_ED },	/*  8: E2880 */
/* some PC formats :-) */
	{  8, TYPE_ED },	/*  9: E3280    <- was "CompaQ" == E2880 for PC */
	{  5, TYPE_HD },	/* 10: h1440 = H1440 */
	{  9, TYPE_HD },	/* 11: H1680 */
	{ 10, TYPE_DD },	/* 12: h410  */
	{  3, TYPE_DD },	/* 13: H820     <- == D820, 82x10 */
	{ 11, TYPE_HD },	/* 14: h1476 */
	{ 12, TYPE_HD },	/* 15: H1722 */
	{ 13, TYPE_DD },	/* 16: h420  */
	{ 14, TYPE_DD },	/* 17: H830  */
	{ 15, TYPE_HD },	/* 18: h1494 */
	{ 16, TYPE_HD },	/* 19: H1743 */
	{ 17, TYPE_DD },	/* 20: h880  */
	{ 18, TYPE_DD },	/* 21: D1040 */
	{ 19, TYPE_DD },	/* 22: D1120 */
	{ 20, TYPE_HD },	/* 23: h1600 */
	{ 21, TYPE_HD },	/* 24: H1760 */
	{ 22, TYPE_HD },	/* 25: H1920 */
	{ 23, TYPE_ED },	/* 26: E3200 */
	{ 24, TYPE_ED },	/* 27: E3520 */
	{ 25, TYPE_ED },	/* 28: E3840 */
	{ 26, TYPE_HD },	/* 29: H1840 */
	{ 27, TYPE_DD },	/* 30: D800  */
	{  6, TYPE_HD },	/* 31: H1640    <- was H1600 == h1600 for PC */
};

#define NUM_DISK_MINORS ARRAY_SIZE(minor2disktype)

/*
 * Maximum disk size (in kilobytes). This default is used whenever the
 * current disk size is unknown.
 */
#define MAX_DISK_SIZE 3280

/*
 * MSch: User-provided type information. 'drive' points to
 * the respective entry of this array. Set by FDSETPRM ioctls.
 */
static struct atari_disk_type user_params[FD_MAX_UNITS];

/*
 * User-provided permanent type information. 'drive' points to
 * the respective entry of this array.  Set by FDDEFPRM ioctls, 
 * restored upon disk change by floppy_revalidate() if valid (as seen by
 * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?)
 */
static struct atari_disk_type default_params[FD_MAX_UNITS];

/* current info on each unit */
static struct atari_floppy_struct {
	int connected;				/* !=0 : drive is connected */
	int autoprobe;				/* !=0 : do autoprobe	    */

	struct atari_disk_type	*disktype;	/* current type of disk */

	int track;		/* current head position or -1 if
				   unknown */
	unsigned int steprate;	/* steprate setting */
	unsigned int wpstat;	/* current state of WP signal (for
				   disk change detection) */
	int flags;		/* flags */
	struct gendisk *disk;
	int ref;
	int type;
} unit[FD_MAX_UNITS];

#define	UD	unit[drive]
#define	UDT	unit[drive].disktype
#define	SUD	unit[SelectedDrive]
#define	SUDT	unit[SelectedDrive].disktype


#define FDC_READ(reg) ({			\
    /* unsigned long __flags; */		\
    unsigned short __val;			\
    /* local_irq_save(__flags); */		\
    dma_wd.dma_mode_status = 0x80 | (reg);	\
    udelay(25);					\
    __val = dma_wd.fdc_acces_seccount;		\
    MFPDELAY();					\
    /* local_irq_restore(__flags); */		\
    __val & 0xff;				\
})

#define FDC_WRITE(reg,val)			\
    do {					\
	/* unsigned long __flags; */		\
	/* local_irq_save(__flags); */		\
	dma_wd.dma_mode_status = 0x80 | (reg);	\
	udelay(25);				\
	dma_wd.fdc_acces_seccount = (val);	\
	MFPDELAY();				\
        /* local_irq_restore(__flags); */	\
    } while(0)


/* Buffering variables:
 * First, there is a DMA buffer in ST-RAM that is used for floppy DMA
 * operations. Second, a track buffer is used to cache a whole track
 * of the disk to save read operations. These are two separate buffers
 * because that allows write operations without clearing the track buffer.
 */

static int MaxSectors[] = {
	11, 22, 44
};
static int BufferSize[] = {
	15*512, 30*512, 60*512
};

#define	BUFFER_SIZE	(BufferSize[DriveType])

unsigned char *DMABuffer;			  /* buffer for writes */
static unsigned long PhysDMABuffer;   /* physical address */

static int UseTrackbuffer = -1;		  /* Do track buffering? */
module_param(UseTrackbuffer, int, 0);

unsigned char *TrackBuffer;			  /* buffer for reads */
static unsigned long PhysTrackBuffer; /* physical address */
static int BufferDrive, BufferSide, BufferTrack;
static int read_track;		/* non-zero if we are reading whole tracks */

#define	SECTOR_BUFFER(sec)	(TrackBuffer + ((sec)-1)*512)
#define	IS_BUFFERED(drive,side,track) \
    (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))

/*
 * These are global variables, as that's the easiest way to give
 * information to interrupts. They are the data used for the current
 * request.
 */
static int SelectedDrive = 0;
static int ReqCmd, ReqBlock;
static int ReqSide, ReqTrack, ReqSector, ReqCnt;
static int HeadSettleFlag = 0;
static unsigned char *ReqData, *ReqBuffer;
static int MotorOn = 0, MotorOffTrys;
static int IsFormatting = 0, FormatError;

static int UserSteprate[FD_MAX_UNITS] = { -1, -1 };
module_param_array(UserSteprate, int, NULL, 0);

/* Synchronization of FDC access. */
static volatile int fdc_busy = 0;
static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
static DECLARE_COMPLETION(format_wait);

static unsigned long changed_floppies = 0xff, fake_change = 0;
#define	CHECK_CHANGE_DELAY	HZ/2

#define	FD_MOTOR_OFF_DELAY	(3*HZ)
#define	FD_MOTOR_OFF_MAXTRY	(10*20)

#define FLOPPY_TIMEOUT		(6*HZ)
#define RECALIBRATE_ERRORS	4	/* After this many errors the drive
					 * will be recalibrated. */
#define MAX_ERRORS		8	/* After this many errors the driver
					 * will give up. */


/*
 * The driver is trying to determine the correct media format
 * while Probing is set. fd_rwsec_done() clears it after a
 * successful access.
 */
static int Probing = 0;

/* This flag is set when a dummy seek is necessary to make the WP
 * status bit accessible.
 */
static int NeedSeek = 0;


#ifdef DEBUG
#define DPRINT(a)	printk a
#else
#define DPRINT(a)
#endif

/***************************** Prototypes *****************************/

static void fd_select_side( int side );
static void fd_select_drive( int drive );
static void fd_deselect( void );
static void fd_motor_off_timer( unsigned long dummy );
static void check_change( unsigned long dummy );
static irqreturn_t floppy_irq (int irq, void *dummy);
static void fd_error( void );
static int do_format(int drive, int type, struct atari_format_descr *desc);
static void do_fd_action( int drive );
static void fd_calibrate( void );
static void fd_calibrate_done( int status );
static void fd_seek( void );
static void fd_seek_done( int status );
static void fd_rwsec( void );
static void fd_readtrack_check( unsigned long dummy );
static void fd_rwsec_done( int status );
static void fd_rwsec_done1(int status);
static void fd_writetrack( void );
static void fd_writetrack_done( int status );
static void fd_times_out( unsigned long dummy );
static void finish_fdc( void );
static void finish_fdc_done( int dummy );
static void setup_req_params( int drive );
static void redo_fd_request( void);
static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int
                     cmd, unsigned long param);
static void fd_probe( int drive );
static int fd_test_drive_present( int drive );
static void config_types( void );
static int floppy_open(struct block_device *bdev, fmode_t mode);
static void floppy_release(struct gendisk *disk, fmode_t mode);

/************************* End of Prototypes **************************/

static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer);
static DEFINE_TIMER(readtrack_timer, fd_readtrack_check);
static DEFINE_TIMER(timeout_timer, fd_times_out);
static DEFINE_TIMER(fd_timer, check_change);
	
static void fd_end_request_cur(blk_status_t err)
{
	if (!__blk_end_request_cur(fd_request, err))
		fd_request = NULL;
}

static inline void start_motor_off_timer(void)
{
	mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY);
	MotorOffTrys = 0;
}

static inline void start_check_change_timer( void )
{
	mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY);
}

static inline void start_timeout(void)
{
	mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT);
}

static inline void stop_timeout(void)
{
	del_timer(&timeout_timer);
}

/* Select the side to use. */

static void fd_select_side( int side )
{
	unsigned long flags;

	/* protect against various other ints mucking around with the PSG */
	local_irq_save(flags);
  
	sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
	sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 :
	                                 sound_ym.rd_data_reg_sel & 0xfe;

	local_irq_restore(flags);
}


/* Select a drive, update the FDC's track register and set the correct
 * clock speed for this disk's type.
 */

static void fd_select_drive( int drive )
{
	unsigned long flags;
	unsigned char tmp;
  
	if (drive == SelectedDrive)
	  return;

	/* protect against various other ints mucking around with the PSG */
	local_irq_save(flags);
	sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
	tmp = sound_ym.rd_data_reg_sel;
	sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1);
	atari_dont_touch_floppy_select = 1;
	local_irq_restore(flags);

	/* restore track register to saved value */
	FDC_WRITE( FDCREG_TRACK, UD.track );
	udelay(25);

	/* select 8/16 MHz */
	if (UDT)
		if (ATARIHW_PRESENT(FDCSPEED))
			dma_wd.fdc_speed = UDT->fdc_speed;
	
	SelectedDrive = drive;
}


/* Deselect both drives. */

static void fd_deselect( void )
{
	unsigned long flags;

	/* protect against various other ints mucking around with the PSG */
	local_irq_save(flags);
	atari_dont_touch_floppy_select = 0;
	sound_ym.rd_data_reg_sel=14;	/* Select PSG Port A */
	sound_ym.wd_data = (sound_ym.rd_data_reg_sel |
			    (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */
	/* On Falcon, the drive B select line is used on the printer port, so
	 * leave it alone... */
	SelectedDrive = -1;
	local_irq_restore(flags);
}


/* This timer function deselects the drives when the FDC switched the
 * motor off. The deselection cannot happen earlier because the FDC
 * counts the index signals, which arrive only if one drive is selected.
 */

static void fd_motor_off_timer( unsigned long dummy )
{
	unsigned char status;

	if (SelectedDrive < 0)
		/* no drive selected, needn't deselect anyone */
		return;

	if (stdma_islocked())
		goto retry;

	status = FDC_READ( FDCREG_STATUS );

	if (!(status & 0x80)) {
		/* motor already turned off by FDC -> deselect drives */
		MotorOn = 0;
		fd_deselect();
		return;
	}
	/* not yet off, try again */

  retry:
	/* Test again later; if tested too often, it seems there is no disk
	 * in the drive and the FDC will leave the motor on forever (or,
	 * at least until a disk is inserted). So we'll test only twice
	 * per second from then on...
	 */
	mod_timer(&motor_off_timer,
		  jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2));
}


/* This function is repeatedly called to detect disk changes (as good
 * as possible) and keep track of the current state of the write protection.
 */

static void check_change( unsigned long dummy )
{
	static int    drive = 0;

	unsigned long flags;
	unsigned char old_porta;
	int			  stat;

	if (++drive > 1 || !UD.connected)
		drive = 0;

	/* protect against various other ints mucking around with the PSG */
	local_irq_save(flags);

	if (!stdma_islocked()) {
		sound_ym.rd_data_reg_sel = 14;
		old_porta = sound_ym.rd_data_reg_sel;
		sound_ym.wd_data = (old_porta | DSKDRVNONE) &
			               ~(drive == 0 ? DSKDRV0 : DSKDRV1);
		stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT);
		sound_ym.wd_data = old_porta;

		if (stat != UD.wpstat) {
			DPRINT(( "wpstat[%d] = %d\n", drive, stat ));
			UD.wpstat = stat;
			set_bit (drive, &changed_floppies);
		}
	}
	local_irq_restore(flags);

	start_check_change_timer();
}

 
/* Handling of the Head Settling Flag: This flag should be set after each
 * seek operation, because we don't use seeks with verify.
 */

static inline void set_head_settle_flag(void)
{
	HeadSettleFlag = FDCCMDADD_E;
}

static inline int get_head_settle_flag(void)
{
	int	tmp = HeadSettleFlag;
	HeadSettleFlag = 0;
	return( tmp );
}

static inline void copy_buffer(void *from, void *to)
{
	ulong *p1 = (ulong *)from, *p2 = (ulong *)to;
	int cnt;

	for (cnt = 512/4; cnt; cnt--)
		*p2++ = *p1++;
}

  
  

/* General Interrupt Handling */

static void (*FloppyIRQHandler)( int status ) = NULL;

static irqreturn_t floppy_irq (int irq, void *dummy)
{
	unsigned char status;
	void (*handler)( int );

	handler = xchg(&FloppyIRQHandler, NULL);

	if (handler) {
		nop();
		status = FDC_READ( FDCREG_STATUS );
		DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler));
		handler( status );
	}
	else {
		DPRINT(("FDC irq, no handler\n"));
	}
	return IRQ_HANDLED;
}


/* Error handling: If some error happened, retry some times, then
 * recalibrate, then try again, and fail after MAX_ERRORS.
 */

static void fd_error( void )
{
	if (IsFormatting) {
		IsFormatting = 0;
		FormatError = 1;
		complete(&format_wait);
		return;
	}

	if (!fd_request)
		return;

	fd_request->error_count++;
	if (fd_request->error_count >= MAX_ERRORS) {
		printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive );
		fd_end_request_cur(BLK_STS_IOERR);
	}
	else if (fd_request->error_count == RECALIBRATE_ERRORS) {
		printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive );
		if (SelectedDrive != -1)
			SUD.track = -1;
	}
	redo_fd_request();
}



#define	SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)


/* ---------- Formatting ---------- */

#define FILL(n,val)		\
    do {			\
	memset( p, val, n );	\
	p += n;			\
    } while(0)

static int do_format(int drive, int type, struct atari_format_descr *desc)
{
	unsigned char	*p;
	int sect, nsect;
	unsigned long	flags;

	DPRINT(("do_format( dr=%d tr=%d he=%d offs=%d )\n",
		drive, desc->track, desc->head, desc->sect_offset ));

	wait_event(fdc_wait, cmpxchg(&fdc_busy, 0, 1) == 0);
	local_irq_save(flags);
	stdma_lock(floppy_irq, NULL);
	atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
	local_irq_restore(flags);

	if (type) {
		if (--type >= NUM_DISK_MINORS ||
		    minor2disktype[type].drive_types > DriveType) {
			redo_fd_request();
			return -EINVAL;
		}
		type = minor2disktype[type].index;
		UDT = &atari_disk_type[type];
	}

	if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
		redo_fd_request();
		return -EINVAL;
	}

	nsect = UDT->spt;
	p = TrackBuffer;
	/* The track buffer is used for the raw track data, so its
	   contents become invalid! */
	BufferDrive = -1;
	/* stop deselect timer */
	del_timer( &motor_off_timer );

	FILL( 60 * (nsect / 9), 0x4e );
	for( sect = 0; sect < nsect; ++sect ) {
		FILL( 12, 0 );
		FILL( 3, 0xf5 );
		*p++ = 0xfe;
		*p++ = desc->track;
		*p++ = desc->head;
		*p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
		*p++ = 2;
		*p++ = 0xf7;
		FILL( 22, 0x4e );
		FILL( 12, 0 );
		FILL( 3, 0xf5 );
		*p++ = 0xfb;
		FILL( 512, 0xe5 );
		*p++ = 0xf7;
		FILL( 40, 0x4e );
	}
	FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );

	IsFormatting = 1;
	FormatError = 0;
	ReqTrack = desc->track;
	ReqSide  = desc->head;
	do_fd_action( drive );

	wait_for_completion(&format_wait);

	redo_fd_request();
	return( FormatError ? -EIO : 0 );	
}


/* do_fd_action() is the general procedure for a fd request: All
 * required parameter settings (drive select, side select, track
 * position) are checked and set if needed. For each of these
 * parameters and the actual reading or writing exist two functions:
 * one that starts the setting (or skips it if possible) and one
 * callback for the "done" interrupt. Each done func calls the next
 * set function to propagate the request down to fd_rwsec_done().
 */

static void do_fd_action( int drive )
{
	DPRINT(("do_fd_action\n"));
	
	if (UseTrackbuffer && !IsFormatting) {
	repeat:
	    if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
		if (ReqCmd == READ) {
		    copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
		    if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
			/* read next sector */
			setup_req_params( drive );
			goto repeat;
		    }
		    else {
			/* all sectors finished */
			fd_end_request_cur(BLK_STS_OK);
			redo_fd_request();
			return;
		    }
		}
		else {
		    /* cmd == WRITE, pay attention to track buffer
		     * consistency! */
		    copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
		}
	    }
	}

	if (SelectedDrive != drive)
		fd_select_drive( drive );
    
	if (UD.track == -1)
		fd_calibrate();
	else if (UD.track != ReqTrack << UDT->stretch)
		fd_seek();
	else if (IsFormatting)
		fd_writetrack();
	else
		fd_rwsec();
}


/* Seek to track 0 if the current track is unknown */

static void fd_calibrate( void )
{
	if (SUD.track >= 0) {
		fd_calibrate_done( 0 );
		return;
	}

	if (ATARIHW_PRESENT(FDCSPEED))
		dma_wd.fdc_speed = 0; 	/* always seek with 8 Mhz */;
	DPRINT(("fd_calibrate\n"));
	SET_IRQ_HANDLER( fd_calibrate_done );
	/* we can't verify, since the speed may be incorrect */
	FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );

	NeedSeek = 1;
	MotorOn = 1;
	start_timeout();
	/* wait for IRQ */
}


static void fd_calibrate_done( int status )
{
	DPRINT(("fd_calibrate_done()\n"));
	stop_timeout();
    
	/* set the correct speed now */
	if (ATARIHW_PRESENT(FDCSPEED))
		dma_wd.fdc_speed = SUDT->fdc_speed;
	if (status & FDCSTAT_RECNF) {
		printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive );
		fd_error();
	}
	else {
		SUD.track = 0;
		fd_seek();
	}
}
  
  
/* Seek the drive to the requested track. The drive must have been
 * calibrated at some point before this.
 */
  
static void fd_seek( void )
{
	if (SUD.track == ReqTrack << SUDT->stretch) {
		fd_seek_done( 0 );
		return;
	}

	if (ATARIHW_PRESENT(FDCSPEED)) {
		dma_wd.fdc_speed = 0;	/* always seek witch 8 Mhz */
		MFPDELAY();
	}

	DPRINT(("fd_seek() to track %d\n",ReqTrack));
	FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
	udelay(25);
	SET_IRQ_HANDLER( fd_seek_done );
	FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );

	MotorOn = 1;
	set_head_settle_flag();
	start_timeout();
	/* wait for IRQ */
}


static void fd_seek_done( int status )
{
	DPRINT(("fd_seek_done()\n"));
	stop_timeout();
	
	/* set the correct speed */
	if (ATARIHW_PRESENT(FDCSPEED))
		dma_wd.fdc_speed = SUDT->fdc_speed;
	if (status & FDCSTAT_RECNF) {
		printk(KERN_ERR "fd%d: seek error (to track %d)\n",
				SelectedDrive, ReqTrack );
		/* we don't know exactly which track we are on now! */
		SUD.track = -1;
		fd_error();
	}
	else {
		SUD.track = ReqTrack << SUDT->stretch;
		NeedSeek = 0;
		if (IsFormatting)
			fd_writetrack();
		else
			fd_rwsec();
	}
}


/* This does the actual reading/writing after positioning the head
 * over the correct track.
 */

static int MultReadInProgress = 0;


static void fd_rwsec( void )
{
	unsigned long paddr, flags;
	unsigned int  rwflag, old_motoron;
	unsigned int track;
	
	DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
	if (ReqCmd == WRITE) {
		if (ATARIHW_PRESENT(EXTD_DMA)) {
			paddr = virt_to_phys(ReqData);
		}
		else {
			copy_buffer( ReqData, DMABuffer );
			paddr = PhysDMABuffer;
		}
		dma_cache_maintenance( paddr, 512, 1 );
		rwflag = 0x100;
	}
	else {
		if (read_track)
			paddr = PhysTrackBuffer;
		else
			paddr = ATARIHW_PRESENT(EXTD_DMA) ? 
				virt_to_phys(ReqData) : PhysDMABuffer;
		rwflag = 0;
	}

	fd_select_side( ReqSide );
  
	/* Start sector of this operation */
	FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
	MFPDELAY();
	/* Cheat for track if stretch != 0 */
	if (SUDT->stretch) {
		track = FDC_READ( FDCREG_TRACK);
		MFPDELAY();
		FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
	}
	udelay(25);
  
	/* Setup DMA */
	local_irq_save(flags);
	dma_wd.dma_lo = (unsigned char)paddr;
	MFPDELAY();
	paddr >>= 8;
	dma_wd.dma_md = (unsigned char)paddr;
	MFPDELAY();
	paddr >>= 8;
	if (ATARIHW_PRESENT(EXTD_DMA))
		st_dma_ext_dmahi = (unsigned short)paddr;
	else
		dma_wd.dma_hi = (unsigned char)paddr;
	MFPDELAY();
	local_irq_restore(flags);
  
	/* Clear FIFO and switch DMA to correct mode */  
	dma_wd.dma_mode_status = 0x90 | rwflag;  
	MFPDELAY();
	dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);  
	MFPDELAY();
	dma_wd.dma_mode_status = 0x90 | rwflag;
	MFPDELAY();
  
	/* How many sectors for DMA */
	dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
  
	udelay(25);  
  
	/* Start operation */
	dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
	udelay(25);
	SET_IRQ_HANDLER( fd_rwsec_done );
	dma_wd.fdc_acces_seccount =
	  (get_head_settle_flag() |
	   (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));

	old_motoron = MotorOn;
	MotorOn = 1;
	NeedSeek = 1;
	/* wait for interrupt */

	if (read_track) {
		/* If reading a whole track, wait about one disk rotation and
		 * then check if all sectors are read. The FDC will even
		 * search for the first non-existent sector and need 1 sec to
		 * recognise that it isn't present :-(
		 */
		MultReadInProgress = 1;
		mod_timer(&readtrack_timer,
			  /* 1 rot. + 5 rot.s if motor was off  */
			  jiffies + HZ/5 + (old_motoron ? 0 : HZ));
	}
	start_timeout();
}

    
static void fd_readtrack_check( unsigned long dummy )
{
	unsigned long flags, addr, addr2;

	local_irq_save(flags);

	if (!MultReadInProgress) {
		/* This prevents a race condition that could arise if the
		 * interrupt is triggered while the calling of this timer
		 * callback function takes place. The IRQ function then has
		 * already cleared 'MultReadInProgress'  when flow of control
		 * gets here.
		 */
		local_irq_restore(flags);
		return;
	}

	/* get the current DMA address */
	/* ++ f.a. read twice to avoid being fooled by switcher */
	addr = 0;
	do {
		addr2 = addr;
		addr = dma_wd.dma_lo & 0xff;
		MFPDELAY();
		addr |= (dma_wd.dma_md & 0xff) << 8;
		MFPDELAY();
		if (ATARIHW_PRESENT( EXTD_DMA ))
			addr |= (st_dma_ext_dmahi & 0xffff) << 16;
		else
			addr |= (dma_wd.dma_hi & 0xff) << 16;
		MFPDELAY();
	} while(addr != addr2);
  
	if (addr >= PhysTrackBuffer + SUDT->spt*512) {
		/* already read enough data, force an FDC interrupt to stop
		 * the read operation
		 */
		SET_IRQ_HANDLER( NULL );
		MultReadInProgress = 0;
		local_irq_restore(flags);
		DPRINT(("fd_readtrack_check(): done\n"));
		FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
		udelay(25);

		/* No error until now -- the FDC would have interrupted
		 * otherwise!
		 */
		fd_rwsec_done1(0);
	}
	else {
		/* not yet finished, wait another tenth rotation */
		local_irq_restore(flags);
		DPRINT(("fd_readtrack_check(): not yet finished\n"));
		mod_timer(&readtrack_timer, jiffies + HZ/5/10);
	}
}


static void fd_rwsec_done( int status )
{
	DPRINT(("fd_rwsec_done()\n"));

	if (read_track) {
		del_timer(&readtrack_timer);
		if (!MultReadInProgress)
			return;
		MultReadInProgress = 0;
	}
	fd_rwsec_done1(status);
}

static void fd_rwsec_done1(int status)
{
	unsigned int track;

	stop_timeout();
	
	/* Correct the track if stretch != 0 */
	if (SUDT->stretch) {
		track = FDC_READ( FDCREG_TRACK);
		MFPDELAY();
		FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
	}

	if (!UseTrackbuffer) {
		dma_wd.dma_mode_status = 0x90;
		MFPDELAY();
		if (!(dma_wd.dma_mode_status & 0x01)) {
			printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive );
			goto err_end;
		}
	}
	MFPDELAY();

	if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
		printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
		goto err_end;
	}	
	if ((status & FDCSTAT_RECNF) &&
	    /* RECNF is no error after a multiple read when the FDC
	       searched for a non-existent sector! */
	    !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
		if (Probing) {
			if (SUDT > atari_disk_type) {
			    if (SUDT[-1].blocks > ReqBlock) {
				/* try another disk type */
				SUDT--;
				set_capacity(unit[SelectedDrive].disk,
							SUDT->blocks);
			    } else
				Probing = 0;
			}
			else {
				if (SUD.flags & FTD_MSG)
					printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n",
					       SelectedDrive, SUDT->name );
				Probing=0;
			}
		} else {	
/* record not found, but not probing. Maybe stretch wrong ? Restart probing */
			if (SUD.autoprobe) {
				SUDT = atari_disk_type + StartDiskType[DriveType];
				set_capacity(unit[SelectedDrive].disk,
							SUDT->blocks);
				Probing = 1;
			}
		}
		if (Probing) {
			if (ATARIHW_PRESENT(FDCSPEED)) {
				dma_wd.fdc_speed = SUDT->fdc_speed;
				MFPDELAY();
			}
			setup_req_params( SelectedDrive );
			BufferDrive = -1;
			do_fd_action( SelectedDrive );
			return;
		}

		printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",
		       SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
		goto err_end;
	}
	if (status & FDCSTAT_CRC) {
		printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",
		       SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
		goto err_end;
	}
	if (status & FDCSTAT_LOST) {
		printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",
		       SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
		goto err_end;
	}

	Probing = 0;
	
	if (ReqCmd == READ) {
		if (!read_track) {
			void *addr;
			addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
			dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
			if (!ATARIHW_PRESENT( EXTD_DMA ))
				copy_buffer (addr, ReqData);
		} else {
			dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
			BufferDrive = SelectedDrive;
			BufferSide  = ReqSide;
			BufferTrack = ReqTrack;
			copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
		}
	}
  
	if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
		/* read next sector */
		setup_req_params( SelectedDrive );
		do_fd_action( SelectedDrive );
	}
	else {
		/* all sectors finished */
		fd_end_request_cur(BLK_STS_OK);
		redo_fd_request();
	}
	return;
  
  err_end:
	BufferDrive = -1;
	fd_error();
}


static void fd_writetrack( void )
{
	unsigned long paddr, flags;
	unsigned int track;
	
	DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide ));

	paddr = PhysTrackBuffer;
	dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );

	fd_select_side( ReqSide );
  
	/* Cheat for track if stretch != 0 */
	if (SUDT->stretch) {
		track = FDC_READ( FDCREG_TRACK);
		MFPDELAY();
		FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
	}
	udelay(40);
  
	/* Setup DMA */
	local_irq_save(flags);
	dma_wd.dma_lo = (unsigned char)paddr;
	MFPDELAY();
	paddr >>= 8;
	dma_wd.dma_md = (unsigned char)paddr;
	MFPDELAY();
	paddr >>= 8;
	if (ATARIHW_PRESENT( EXTD_DMA ))
		st_dma_ext_dmahi = (unsigned short)paddr;
	else
		dma_wd.dma_hi = (unsigned char)paddr;
	MFPDELAY();
	local_irq_restore(flags);
  
	/* Clear FIFO and switch DMA to correct mode */  
	dma_wd.dma_mode_status = 0x190;  
	MFPDELAY();
	dma_wd.dma_mode_status = 0x90;  
	MFPDELAY();
	dma_wd.dma_mode_status = 0x190;
	MFPDELAY();
  
	/* How many sectors for DMA */
	dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
	udelay(40);  
  
	/* Start operation */
	dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
	udelay(40);
	SET_IRQ_HANDLER( fd_writetrack_done );
	dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag(); 

	MotorOn = 1;
	start_timeout();
	/* wait for interrupt */
}


static void fd_writetrack_done( int status )
{
	DPRINT(("fd_writetrack_done()\n"));

	stop_timeout();

	if (status & FDCSTAT_WPROT) {
		printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
		goto err_end;
	}	
	if (status & FDCSTAT_LOST) {
		printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",
				SelectedDrive, ReqSide, ReqTrack );
		goto err_end;
	}

	complete(&format_wait);
	return;

  err_end:
	fd_error();
}

static void fd_times_out( unsigned long dummy )
{
	atari_disable_irq( IRQ_MFP_FDC );
	if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
					  * before we came here... */

	SET_IRQ_HANDLER( NULL );
	/* If the timeout occurred while the readtrack_check timer was
	 * active, we need to cancel it, else bad things will happen */
	if (UseTrackbuffer)
		del_timer( &readtrack_timer );
	FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
	udelay( 25 );
	
	printk(KERN_ERR "floppy timeout\n" );
	fd_error();
  end:
	atari_enable_irq( IRQ_MFP_FDC );
}


/* The (noop) seek operation here is needed to make the WP bit in the
 * FDC status register accessible for check_change. If the last disk
 * operation would have been a RDSEC, this bit would always read as 0
 * no matter what :-( To save time, the seek goes to the track we're
 * already on.
 */

static void finish_fdc( void )
{
	if (!NeedSeek) {
		finish_fdc_done( 0 );
	}
	else {
		DPRINT(("finish_fdc: dummy seek started\n"));
		FDC_WRITE (FDCREG_DATA, SUD.track);
		SET_IRQ_HANDLER( finish_fdc_done );
		FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
		MotorOn = 1;
		start_timeout();
		/* we must wait for the IRQ here, because the ST-DMA
		   is released immediately afterwards and the interrupt
		   may be delivered to the wrong driver. */
	  }
}


static void finish_fdc_done( int dummy )
{
	unsigned long flags;

	DPRINT(("finish_fdc_done entered\n"));
	stop_timeout();
	NeedSeek = 0;

	if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
		/* If the check for a disk change is done too early after this
		 * last seek command, the WP bit still reads wrong :-((
		 */
		mod_timer(&fd_timer, jiffies + 5);
	else
		start_check_change_timer();
	start_motor_off_timer();

	local_irq_save(flags);
	stdma_release();
	fdc_busy = 0;
	wake_up( &fdc_wait );
	local_irq_restore(flags);

	DPRINT(("finish_fdc() finished\n"));
}

/* The detection of disk changes is a dark chapter in Atari history :-(
 * Because the "Drive ready" signal isn't present in the Atari
 * hardware, one has to rely on the "Write Protect". This works fine,
 * as long as no write protected disks are used. TOS solves this
 * problem by introducing tri-state logic ("maybe changed") and
 * looking at the serial number in block 0. This isn't possible for
 * Linux, since the floppy driver can't make assumptions about the
 * filesystem used on the disk and thus the contents of block 0. I've
 * chosen the method to always say "The disk was changed" if it is
 * unsure whether it was. This implies that every open or mount
 * invalidates the disk buffers if you work with write protected
 * disks. But at least this is better than working with incorrect data
 * due to unrecognised disk changes.
 */

static unsigned int floppy_check_events(struct gendisk *disk,
					unsigned int clearing)
{
	struct atari_floppy_struct *p = disk->private_data;
	unsigned int drive = p - unit;
	if (test_bit (drive, &fake_change)) {
		/* simulated change (e.g. after formatting) */
		return DISK_EVENT_MEDIA_CHANGE;
	}
	if (test_bit (drive, &changed_floppies)) {
		/* surely changed (the WP signal changed at least once) */
		return DISK_EVENT_MEDIA_CHANGE;
	}
	if (UD.wpstat) {
		/* WP is on -> could be changed: to be sure, buffers should be
		 * invalidated...
		 */
		return DISK_EVENT_MEDIA_CHANGE;
	}

	return 0;
}

static int floppy_revalidate(struct gendisk *disk)
{
	struct atari_floppy_struct *p = disk->private_data;
	unsigned int drive = p - unit;

	if (test_bit(drive, &changed_floppies) ||
	    test_bit(drive, &fake_change) ||
	    p->disktype == 0) {
		if (UD.flags & FTD_MSG)
			printk(KERN_ERR "floppy: clear format %p!\n", UDT);
		BufferDrive = -1;
		clear_bit(drive, &fake_change);
		clear_bit(drive, &changed_floppies);
		/* MSch: clearing geometry makes sense only for autoprobe
		   formats, for 'permanent user-defined' parameter:
		   restore default_params[] here if flagged valid! */
		if (default_params[drive].blocks == 0)
			UDT = NULL;
		else
			UDT = &default_params[drive];
	}
	return 0;
}


/* This sets up the global variables describing the current request. */

static void setup_req_params( int drive )
{
	int block = ReqBlock + ReqCnt;

	ReqTrack = block / UDT->spt;
	ReqSector = block - ReqTrack * UDT->spt + 1;
	ReqSide = ReqTrack & 1;
	ReqTrack >>= 1;
	ReqData = ReqBuffer + 512 * ReqCnt;

	if (UseTrackbuffer)
		read_track = (ReqCmd == READ && fd_request->error_count == 0);
	else
		read_track = 0;

	DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide,
			ReqTrack, ReqSector, (unsigned long)ReqData ));
}

/*
 * Round-robin between our available drives, doing one request from each
 */
static struct request *set_next_request(void)
{
	struct request_queue *q;
	int old_pos = fdc_queue;
	struct request *rq = NULL;

	do {
		q = unit[fdc_queue].disk->queue;
		if (++fdc_queue == FD_MAX_UNITS)
			fdc_queue = 0;
		if (q) {
			rq = blk_fetch_request(q);
			if (rq) {
				rq->error_count = 0;
				break;
			}
		}
	} while (fdc_queue != old_pos);

	return rq;
}


static void redo_fd_request(void)
{
	int drive, type;
	struct atari_floppy_struct *floppy;

	DPRINT(("redo_fd_request: fd_request=%p dev=%s fd_request->sector=%ld\n",
		fd_request, fd_request ? fd_request->rq_disk->disk_name : "",
		fd_request ? blk_rq_pos(fd_request) : 0 ));

	IsFormatting = 0;

repeat:
	if (!fd_request) {
		fd_request = set_next_request();
		if (!fd_request)
			goto the_end;
	}

	floppy = fd_request->rq_disk->private_data;
	drive = floppy - unit;
	type = floppy->type;
	
	if (!UD.connected) {
		/* drive not connected */
		printk(KERN_ERR "Unknown Device: fd%d\n", drive );
		fd_end_request_cur(BLK_STS_IOERR);
		goto repeat;
	}
		
	if (type == 0) {
		if (!UDT) {
			Probing = 1;
			UDT = atari_disk_type + StartDiskType[DriveType];
			set_capacity(floppy->disk, UDT->blocks);
			UD.autoprobe = 1;
		}
	} 
	else {
		/* user supplied disk type */
		if (--type >= NUM_DISK_MINORS) {
			printk(KERN_WARNING "fd%d: invalid disk format", drive );
			fd_end_request_cur(BLK_STS_IOERR);
			goto repeat;
		}
		if (minor2disktype[type].drive_types > DriveType)  {
			printk(KERN_WARNING "fd%d: unsupported disk format", drive );
			fd_end_request_cur(BLK_STS_IOERR);
			goto repeat;
		}
		type = minor2disktype[type].index;
		UDT = &atari_disk_type[type];
		set_capacity(floppy->disk, UDT->blocks);
		UD.autoprobe = 0;
	}
	
	if (blk_rq_pos(fd_request) + 1 > UDT->blocks) {
		fd_end_request_cur(BLK_STS_IOERR);
		goto repeat;
	}

	/* stop deselect timer */
	del_timer( &motor_off_timer );
		
	ReqCnt = 0;
	ReqCmd = rq_data_dir(fd_request);
	ReqBlock = blk_rq_pos(fd_request);
	ReqBuffer = bio_data(fd_request->bio);
	setup_req_params( drive );
	do_fd_action( drive );

	return;

  the_end:
	finish_fdc();
}


void do_fd_request(struct request_queue * q)
{
	DPRINT(("do_fd_request for pid %d\n",current->pid));
	wait_event(fdc_wait, cmpxchg(&fdc_busy, 0, 1) == 0);
	stdma_lock(floppy_irq, NULL);

	atari_disable_irq( IRQ_MFP_FDC );
	redo_fd_request();
	atari_enable_irq( IRQ_MFP_FDC );
}

static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
		    unsigned int cmd, unsigned long param)
{
	struct gendisk *disk = bdev->bd_disk;
	struct atari_floppy_struct *floppy = disk->private_data;
	int drive = floppy - unit;
	int type = floppy->type;
	struct atari_format_descr fmt_desc;
	struct atari_disk_type *dtp;
	struct floppy_struct getprm;
	int settype;
	struct floppy_struct setprm;
	void __user *argp = (void __user *)param;

	switch (cmd) {
	case FDGETPRM:
		if (type) {
			if (--type >= NUM_DISK_MINORS)
				return -ENODEV;
			if (minor2disktype[type].drive_types > DriveType)
				return -ENODEV;
			type = minor2disktype[type].index;
			dtp = &atari_disk_type[type];
			if (UD.flags & FTD_MSG)
			    printk (KERN_ERR "floppy%d: found dtp %p name %s!\n",
			        drive, dtp, dtp->name);
		}
		else {
			if (!UDT)
				return -ENXIO;
			else
				dtp = UDT;
		}
		memset((void *)&getprm, 0, sizeof(getprm));
		getprm.size = dtp->blocks;
		getprm.sect = dtp->spt;
		getprm.head = 2;
		getprm.track = dtp->blocks/dtp->spt/2;
		getprm.stretch = dtp->stretch;
		if (copy_to_user(argp, &getprm, sizeof(getprm)))
			return -EFAULT;
		return 0;
	}
	switch (cmd) {
	case FDSETPRM:
	case FDDEFPRM:
	        /* 
		 * MSch 7/96: simple 'set geometry' case: just set the
		 * 'default' device params (minor == 0).
		 * Currently, the drive geometry is cleared after each
		 * disk change and subsequent revalidate()! simple
		 * implementation of FDDEFPRM: save geometry from a
		 * FDDEFPRM call and restore it in floppy_revalidate() !
		 */

		/* get the parameters from user space */
		if (floppy->ref != 1 && floppy->ref != -1)
			return -EBUSY;
		if (copy_from_user(&setprm, argp, sizeof(setprm)))
			return -EFAULT;
		/* 
		 * first of all: check for floppy change and revalidate, 
		 * or the next access will revalidate - and clear UDT :-(
		 */

		if (floppy_check_events(disk, 0))
		        floppy_revalidate(disk);

		if (UD.flags & FTD_MSG)
		    printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n",
			drive, setprm.size, setprm.sect, setprm.stretch);

		/* what if type > 0 here? Overwrite specified entry ? */
		if (type) {
		        /* refuse to re-set a predefined type for now */
			redo_fd_request();
			return -EINVAL;
		}

		/* 
		 * type == 0: first look for a matching entry in the type list,
		 * and set the UD.disktype field to use the perdefined entry.
		 * TODO: add user-defined format to head of autoprobe list ? 
		 * Useful to include the user-type for future autodetection!
		 */

		for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
			int setidx = 0;
			if (minor2disktype[settype].drive_types > DriveType) {
				/* skip this one, invalid for drive ... */
				continue;
			}
			setidx = minor2disktype[settype].index;
			dtp = &atari_disk_type[setidx];

			/* found matching entry ?? */
			if (   dtp->blocks  == setprm.size 
			    && dtp->spt     == setprm.sect
			    && dtp->stretch == setprm.stretch ) {
				if (UD.flags & FTD_MSG)
				    printk (KERN_INFO "floppy%d: setting %s %p!\n",
				        drive, dtp->name, dtp);
				UDT = dtp;
				set_capacity(floppy->disk, UDT->blocks);

				if (cmd == FDDEFPRM) {
				  /* save settings as permanent default type */
				  default_params[drive].name    = dtp->name;
				  default_params[drive].spt     = dtp->spt;
				  default_params[drive].blocks  = dtp->blocks;
				  default_params[drive].fdc_speed = dtp->fdc_speed;
				  default_params[drive].stretch = dtp->stretch;
				}
				
				return 0;
			}

		}

		/* no matching disk type found above - setting user_params */

	       	if (cmd == FDDEFPRM) {
			/* set permanent type */
			dtp = &default_params[drive];
		} else
			/* set user type (reset by disk change!) */
			dtp = &user_params[drive];

		dtp->name   = "user format";
		dtp->blocks = setprm.size;
		dtp->spt    = setprm.sect;
		if (setprm.sect > 14) 
			dtp->fdc_speed = 3;
		else
			dtp->fdc_speed = 0;
		dtp->stretch = setprm.stretch;

		if (UD.flags & FTD_MSG)
			printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n",
				drive, dtp->blocks, dtp->spt, dtp->stretch);

		/* sanity check */
		if (setprm.track != dtp->blocks/dtp->spt/2 ||
		    setprm.head != 2) {
			redo_fd_request();
			return -EINVAL;
		}

		UDT = dtp;
		set_capacity(floppy->disk, UDT->blocks);

		return 0;
	case FDMSGON:
		UD.flags |= FTD_MSG;
		return 0;
	case FDMSGOFF:
		UD.flags &= ~FTD_MSG;
		return 0;
	case FDSETEMSGTRESH:
		return -EINVAL;
	case FDFMTBEG:
		return 0;
	case FDFMTTRK:
		if (floppy->ref != 1 && floppy->ref != -1)
			return -EBUSY;
		if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc)))
			return -EFAULT;
		return do_format(drive, type, &fmt_desc);
	case FDCLRPRM:
		UDT = NULL;
		/* MSch: invalidate default_params */
		default_params[drive].blocks  = 0;
		set_capacity(floppy->disk, MAX_DISK_SIZE * 2);
	case FDFMTEND:
	case FDFLUSH:
		/* invalidate the buffer track to force a reread */
		BufferDrive = -1;
		set_bit(drive, &fake_change);
		check_disk_change(bdev);
		return 0;
	default:
		return -EINVAL;
	}
}

static int fd_ioctl(struct block_device *bdev, fmode_t mode,
			     unsigned int cmd, unsigned long arg)
{
	int ret;

	mutex_lock(&ataflop_mutex);
	ret = fd_locked_ioctl(bdev, mode, cmd, arg);
	mutex_unlock(&ataflop_mutex);

	return ret;
}

/* Initialize the 'unit' variable for drive 'drive' */

static void __init fd_probe( int drive )
{
	UD.connected = 0;
	UDT  = NULL;

	if (!fd_test_drive_present( drive ))
		return;

	UD.connected = 1;
	UD.track     = 0;
	switch( UserSteprate[drive] ) {
	case 2:
		UD.steprate = FDCSTEP_2;
		break;
	case 3:
		UD.steprate = FDCSTEP_3;
		break;
	case 6:
		UD.steprate = FDCSTEP_6;
		break;
	case 12:
		UD.steprate = FDCSTEP_12;
		break;
	default: /* should be -1 for "not set by user" */
		if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
			UD.steprate = FDCSTEP_3;
		else
			UD.steprate = FDCSTEP_6;
		break;
	}
	MotorOn = 1;	/* from probe restore operation! */
}


/* This function tests the physical presence of a floppy drive (not
 * whether a disk is inserted). This is done by issuing a restore
 * command, waiting max. 2 seconds (that should be enough to move the
 * head across the whole disk) and looking at the state of the "TR00"
 * signal. This should now be raised if there is a drive connected
 * (and there is no hardware failure :-) Otherwise, the drive is
 * declared absent.
 */

static int __init fd_test_drive_present( int drive )
{
	unsigned long timeout;
	unsigned char status;
	int ok;
	
	if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
	fd_select_drive( drive );

	/* disable interrupt temporarily */
	atari_turnoff_irq( IRQ_MFP_FDC );
	FDC_WRITE (FDCREG_TRACK, 0xff00);
	FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );

	timeout = jiffies + 2*HZ+HZ/2;
	while (time_before(jiffies, timeout))
		if (!(st_mfp.par_dt_reg & 0x20))
			break;

	status = FDC_READ( FDCREG_STATUS );
	ok = (status & FDCSTAT_TR00) != 0;

	/* force interrupt to abort restore operation (FDC would try
	 * about 50 seconds!) */
	FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
	udelay(500);
	status = FDC_READ( FDCREG_STATUS );
	udelay(20);

	if (ok) {
		/* dummy seek command to make WP bit accessible */
		FDC_WRITE( FDCREG_DATA, 0 );
		FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
		while( st_mfp.par_dt_reg & 0x20 )
			;
		status = FDC_READ( FDCREG_STATUS );
	}

	atari_turnon_irq( IRQ_MFP_FDC );
	return( ok );
}


/* Look how many and which kind of drives are connected. If there are
 * floppies, additionally start the disk-change and motor-off timers.
 */

static void __init config_types( void )
{
	int drive, cnt = 0;

	/* for probing drives, set the FDC speed to 8 MHz */
	if (ATARIHW_PRESENT(FDCSPEED))
		dma_wd.fdc_speed = 0;

	printk(KERN_INFO "Probing floppy drive(s):\n");
	for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
		fd_probe( drive );
		if (UD.connected) {
			printk(KERN_INFO "fd%d\n", drive);
			++cnt;
		}
	}

	if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
		/* If FDC is still busy from probing, give it another FORCI
		 * command to abort the operation. If this isn't done, the FDC
		 * will interrupt later and its IRQ line stays low, because
		 * the status register isn't read. And this will block any
		 * interrupts on this IRQ line :-(
		 */
		FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
		udelay(500);
		FDC_READ( FDCREG_STATUS );
		udelay(20);
	}
	
	if (cnt > 0) {
		start_motor_off_timer();
		if (cnt == 1) fd_select_drive( 0 );
		start_check_change_timer();
	}
}

/*
 * floppy_open check for aliasing (/dev/fd0 can be the same as
 * /dev/PS0 etc), and disallows simultaneous access to the same
 * drive with different device numbers.
 */

static int floppy_open(struct block_device *bdev, fmode_t mode)
{
	struct atari_floppy_struct *p = bdev->bd_disk->private_data;
	int type  = MINOR(bdev->bd_dev) >> 2;

	DPRINT(("fd_open: type=%d\n",type));
	if (p->ref && p->type != type)
		return -EBUSY;

	if (p->ref == -1 || (p->ref && mode & FMODE_EXCL))
		return -EBUSY;

	if (mode & FMODE_EXCL)
		p->ref = -1;
	else
		p->ref++;

	p->type = type;

	if (mode & FMODE_NDELAY)
		return 0;

	if (mode & (FMODE_READ|FMODE_WRITE)) {
		check_disk_change(bdev);
		if (mode & FMODE_WRITE) {
			if (p->wpstat) {
				if (p->ref < 0)
					p->ref = 0;
				else
					p->ref--;
				return -EROFS;
			}
		}
	}
	return 0;
}

static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
{
	int ret;

	mutex_lock(&ataflop_mutex);
	ret = floppy_open(bdev, mode);
	mutex_unlock(&ataflop_mutex);

	return ret;
}

static void floppy_release(struct gendisk *disk, fmode_t mode)
{
	struct atari_floppy_struct *p = disk->private_data;
	mutex_lock(&ataflop_mutex);
	if (p->ref < 0)
		p->ref = 0;
	else if (!p->ref--) {
		printk(KERN_ERR "floppy_release with fd_ref == 0");
		p->ref = 0;
	}
	mutex_unlock(&ataflop_mutex);
}

static const struct block_device_operations floppy_fops = {
	.owner		= THIS_MODULE,
	.open		= floppy_unlocked_open,
	.release	= floppy_release,
	.ioctl		= fd_ioctl,
	.check_events	= floppy_check_events,
	.revalidate_disk= floppy_revalidate,
};

static struct kobject *floppy_find(dev_t dev, int *part, void *data)
{
	int drive = *part & 3;
	int type  = *part >> 2;
	if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS)
		return NULL;
	*part = 0;
	return get_disk(unit[drive].disk);
}

static int __init atari_floppy_init (void)
{
	int i;

	if (!MACH_IS_ATARI)
		/* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
		return -ENODEV;

	if (register_blkdev(FLOPPY_MAJOR,"fd"))
		return -EBUSY;

	for (i = 0; i < FD_MAX_UNITS; i++) {
		unit[i].disk = alloc_disk(1);
		if (!unit[i].disk)
			goto Enomem;
	}

	if (UseTrackbuffer < 0)
		/* not set by user -> use default: for now, we turn
		   track buffering off for all Medusas, though it
		   could be used with ones that have a counter
		   card. But the test is too hard :-( */
		UseTrackbuffer = !MACH_IS_MEDUSA;

	/* initialize variables */
	SelectedDrive = -1;
	BufferDrive = -1;

	DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
	if (!DMABuffer) {
		printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
		goto Enomem;
	}
	TrackBuffer = DMABuffer + 512;
	PhysDMABuffer = atari_stram_to_phys(DMABuffer);
	PhysTrackBuffer = virt_to_phys(TrackBuffer);
	BufferDrive = BufferSide = BufferTrack = -1;

	for (i = 0; i < FD_MAX_UNITS; i++) {
		unit[i].track = -1;
		unit[i].flags = 0;
		unit[i].disk->major = FLOPPY_MAJOR;
		unit[i].disk->first_minor = i;
		sprintf(unit[i].disk->disk_name, "fd%d", i);
		unit[i].disk->fops = &floppy_fops;
		unit[i].disk->private_data = &unit[i];
		unit[i].disk->queue = blk_init_queue(do_fd_request,
					&ataflop_lock);
		if (!unit[i].disk->queue)
			goto Enomem;
		set_capacity(unit[i].disk, MAX_DISK_SIZE * 2);
		add_disk(unit[i].disk);
	}

	blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
				floppy_find, NULL, NULL);

	printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
	       DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
	       UseTrackbuffer ? "" : "no ");
	config_types();

	return 0;
Enomem:
	while (i--) {
		struct request_queue *q = unit[i].disk->queue;

		put_disk(unit[i].disk);
		if (q)
			blk_cleanup_queue(q);
	}

	unregister_blkdev(FLOPPY_MAJOR, "fd");
	return -ENOMEM;
}

#ifndef MODULE
static int __init atari_floppy_setup(char *str)
{
	int ints[3 + FD_MAX_UNITS];
	int i;

	if (!MACH_IS_ATARI)
		return 0;

	str = get_options(str, 3 + FD_MAX_UNITS, ints);
	
	if (ints[0] < 1) {
		printk(KERN_ERR "ataflop_setup: no arguments!\n" );
		return 0;
	}
	else if (ints[0] > 2+FD_MAX_UNITS) {
		printk(KERN_ERR "ataflop_setup: too many arguments\n" );
	}

	if (ints[1] < 0 || ints[1] > 2)
		printk(KERN_ERR "ataflop_setup: bad drive type\n" );
	else
		DriveType = ints[1];

	if (ints[0] >= 2)
		UseTrackbuffer = (ints[2] > 0);

	for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
		if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
			printk(KERN_ERR "ataflop_setup: bad steprate\n" );
		else
			UserSteprate[i-3] = ints[i];
	}
	return 1;
}

__setup("floppy=", atari_floppy_setup);
#endif

static void __exit atari_floppy_exit(void)
{
	int i;
	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
	for (i = 0; i < FD_MAX_UNITS; i++) {
		struct request_queue *q = unit[i].disk->queue;

		del_gendisk(unit[i].disk);
		put_disk(unit[i].disk);
		blk_cleanup_queue(q);
	}
	unregister_blkdev(FLOPPY_MAJOR, "fd");

	del_timer_sync(&fd_timer);
	atari_stram_free( DMABuffer );
}

module_init(atari_floppy_init)
module_exit(atari_floppy_exit)

MODULE_LICENSE("GPL");