aboutsummaryrefslogtreecommitdiff
path: root/drivers/ide/ide-floppy.c
blob: 61969415c57b7de6fad2532f68d41c3424e15175 (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
/*
 * linux/drivers/ide/ide-floppy.c	Version 0.99	Feb 24 2002
 *
 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2000 - 2002 Paul Bristow <paul@paulbristow.net>
 */

/*
 * IDE ATAPI floppy driver.
 *
 * The driver currently doesn't have any fancy features, just the bare
 * minimum read/write support.
 *
 * This driver supports the following IDE floppy drives:
 *
 * LS-120/240 SuperDisk
 * Iomega Zip 100/250
 * Iomega PC Card Clik!/PocketZip
 *
 * Many thanks to Lode Leroy <Lode.Leroy@www.ibase.be>, who tested so many
 * ALPHA patches to this driver on an EASYSTOR LS-120 ATAPI floppy drive.
 *
 * Ver 0.1   Oct 17 96   Initial test version, mostly based on ide-tape.c.
 * Ver 0.2   Oct 31 96   Minor changes.
 * Ver 0.3   Dec  2 96   Fixed error recovery bug.
 * Ver 0.4   Jan 26 97   Add support for the HDIO_GETGEO ioctl.
 * Ver 0.5   Feb 21 97   Add partitions support.
 *                       Use the minimum of the LBA and CHS capacities.
 *                       Avoid hwgroup->rq == NULL on the last irq.
 *                       Fix potential null dereferencing with DEBUG_LOG.
 * Ver 0.8   Dec  7 97   Increase irq timeout from 10 to 50 seconds.
 *                       Add media write-protect detection.
 *                       Issue START command only if TEST UNIT READY fails.
 *                       Add work-around for IOMEGA ZIP revision 21.D.
 *                       Remove idefloppy_get_capabilities().
 * Ver 0.9   Jul  4 99   Fix a bug which might have caused the number of
 *                        bytes requested on each interrupt to be zero.
 *                        Thanks to <shanos@es.co.nz> for pointing this out.
 * Ver 0.9.sv Jan 6 01   Sam Varshavchik <mrsam@courier-mta.com>
 *                       Implement low level formatting.  Reimplemented
 *                       IDEFLOPPY_CAPABILITIES_PAGE, since we need the srfp
 *                       bit.  My LS-120 drive barfs on
 *                       IDEFLOPPY_CAPABILITIES_PAGE, but maybe it's just me.
 *                       Compromise by not reporting a failure to get this
 *                       mode page.  Implemented four IOCTLs in order to
 *                       implement formatting.  IOCTls begin with 0x4600,
 *                       0x46 is 'F' as in Format.
 *            Jan 9 01   Userland option to select format verify.
 *                       Added PC_SUPPRESS_ERROR flag - some idefloppy drives
 *                       do not implement IDEFLOPPY_CAPABILITIES_PAGE, and
 *                       return a sense error.  Suppress error reporting in
 *                       this particular case in order to avoid spurious
 *                       errors in syslog.  The culprit is
 *                       idefloppy_get_capability_page(), so move it to
 *                       idefloppy_begin_format() so that it's not used
 *                       unless absolutely necessary.
 *                       If drive does not support format progress indication
 *                       monitor the dsc bit in the status register.
 *                       Also, O_NDELAY on open will allow the device to be
 *                       opened without a disk available.  This can be used to
 *                       open an unformatted disk, or get the device capacity.
 * Ver 0.91  Dec 11 99   Added IOMEGA Clik! drive support by 
 *     		   <paul@paulbristow.net>
 * Ver 0.92  Oct 22 00   Paul Bristow became official maintainer for this 
 *           		   driver.  Included Powerbook internal zip kludge.
 * Ver 0.93  Oct 24 00   Fixed bugs for Clik! drive
 *                        no disk on insert and disk change now works
 * Ver 0.94  Oct 27 00   Tidied up to remove strstr(Clik) everywhere
 * Ver 0.95  Nov  7 00   Brought across to kernel 2.4
 * Ver 0.96  Jan  7 01   Actually in line with release version of 2.4.0
 *                       including set_bit patch from Rusty Russell
 * Ver 0.97  Jul 22 01   Merge 0.91-0.96 onto 0.9.sv for ac series
 * Ver 0.97.sv Aug 3 01  Backported from 2.4.7-ac3
 * Ver 0.98  Oct 26 01   Split idefloppy_transfer_pc into two pieces to
 *                        fix a lost interrupt problem. It appears the busy
 *                        bit was being deasserted by my IOMEGA ATAPI ZIP 100
 *                        drive before the drive was actually ready.
 * Ver 0.98a Oct 29 01   Expose delay value so we can play.
 * Ver 0.99  Feb 24 02   Remove duplicate code, modify clik! detection code 
 *                        to support new PocketZip drives 
 */

#define IDEFLOPPY_VERSION "0.99.newide"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/cdrom.h>
#include <linux/ide.h>
#include <linux/bitops.h>
#include <linux/mutex.h>

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

/*
 *	The following are used to debug the driver.
 */
#define IDEFLOPPY_DEBUG_LOG		0
#define IDEFLOPPY_DEBUG_INFO		0
#define IDEFLOPPY_DEBUG_BUGS		1

/* #define IDEFLOPPY_DEBUG(fmt, args...) printk(KERN_INFO fmt, ## args) */
#define IDEFLOPPY_DEBUG( fmt, args... )

#if IDEFLOPPY_DEBUG_LOG
#define debug_log printk
#else
#define debug_log(fmt, args... ) do {} while(0)
#endif


/*
 *	Some drives require a longer irq timeout.
 */
#define IDEFLOPPY_WAIT_CMD		(5 * WAIT_CMD)

/*
 *	After each failed packet command we issue a request sense command
 *	and retry the packet command IDEFLOPPY_MAX_PC_RETRIES times.
 */
#define IDEFLOPPY_MAX_PC_RETRIES	3

/*
 *	With each packet command, we allocate a buffer of
 *	IDEFLOPPY_PC_BUFFER_SIZE bytes.
 */
#define IDEFLOPPY_PC_BUFFER_SIZE	256

/*
 *	In various places in the driver, we need to allocate storage
 *	for packet commands and requests, which will remain valid while
 *	we leave the driver to wait for an interrupt or a timeout event.
 */
#define IDEFLOPPY_PC_STACK		(10 + IDEFLOPPY_MAX_PC_RETRIES)

/*
 *	Our view of a packet command.
 */
typedef struct idefloppy_packet_command_s {
	u8 c[12];				/* Actual packet bytes */
	int retries;				/* On each retry, we increment retries */
	int error;				/* Error code */
	int request_transfer;			/* Bytes to transfer */
	int actually_transferred;		/* Bytes actually transferred */
	int buffer_size;			/* Size of our data buffer */
	int b_count;				/* Missing/Available data on the current buffer */
	struct request *rq;			/* The corresponding request */
	u8 *buffer;				/* Data buffer */
	u8 *current_position;			/* Pointer into the above buffer */
	void (*callback) (ide_drive_t *);	/* Called when this packet command is completed */
	u8 pc_buffer[IDEFLOPPY_PC_BUFFER_SIZE];	/* Temporary buffer */
	unsigned long flags;			/* Status/Action bit flags: long for set_bit */
} idefloppy_pc_t;

/*
 *	Packet command flag bits.
 */
#define	PC_ABORT			0	/* Set when an error is considered normal - We won't retry */
#define PC_DMA_RECOMMENDED		2	/* 1 when we prefer to use DMA if possible */
#define	PC_DMA_IN_PROGRESS		3	/* 1 while DMA in progress */
#define	PC_DMA_ERROR			4	/* 1 when encountered problem during DMA */
#define	PC_WRITING			5	/* Data direction */

#define	PC_SUPPRESS_ERROR		6	/* Suppress error reporting */

/*
 *	Removable Block Access Capabilities Page
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	unsigned	page_code	:6;	/* Page code - Should be 0x1b */
	unsigned	reserved1_6	:1;	/* Reserved */
	unsigned	ps		:1;	/* Should be 0 */
#elif defined(__BIG_ENDIAN_BITFIELD)
	unsigned	ps		:1;	/* Should be 0 */
	unsigned	reserved1_6	:1;	/* Reserved */
	unsigned	page_code	:6;	/* Page code - Should be 0x1b */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
	u8		page_length;		/* Page Length - Should be 0xa */
#if defined(__LITTLE_ENDIAN_BITFIELD)
	unsigned	reserved2	:6;
	unsigned	srfp		:1;	/* Supports reporting progress of format */
	unsigned	sflp		:1;	/* System floppy type device */
	unsigned	tlun		:3;	/* Total logical units supported by the device */
	unsigned	reserved3	:3;
	unsigned	sml		:1;	/* Single / Multiple lun supported */
	unsigned	ncd		:1;	/* Non cd optical device */
#elif defined(__BIG_ENDIAN_BITFIELD)
	unsigned	sflp		:1;	/* System floppy type device */
	unsigned	srfp		:1;	/* Supports reporting progress of format */
	unsigned	reserved2	:6;
	unsigned	ncd		:1;	/* Non cd optical device */
	unsigned	sml		:1;	/* Single / Multiple lun supported */
	unsigned	reserved3	:3;
	unsigned	tlun		:3;	/* Total logical units supported by the device */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
	u8		reserved[8];
} idefloppy_capabilities_page_t;

/*
 *	Flexible disk page.
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	unsigned	page_code	:6;	/* Page code - Should be 0x5 */
	unsigned	reserved1_6	:1;	/* Reserved */
	unsigned	ps		:1;	/* The device is capable of saving the page */
#elif defined(__BIG_ENDIAN_BITFIELD)
	unsigned	ps		:1;	/* The device is capable of saving the page */
	unsigned	reserved1_6	:1;	/* Reserved */
	unsigned	page_code	:6;	/* Page code - Should be 0x5 */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
	u8		page_length;		/* Page Length - Should be 0x1e */
	u16		transfer_rate;		/* In kilobits per second */
	u8		heads, sectors;		/* Number of heads, Number of sectors per track */
	u16		sector_size;		/* Byes per sector */
	u16		cyls;			/* Number of cylinders */
	u8		reserved10[10];
	u8		motor_delay;		/* Motor off delay */
	u8		reserved21[7];
	u16		rpm;			/* Rotations per minute */
	u8		reserved30[2];
} idefloppy_flexible_disk_page_t;
 
/*
 *	Format capacity
 */
typedef struct {
	u8		reserved[3];
	u8		length;			/* Length of the following descriptors in bytes */
} idefloppy_capacity_header_t;

typedef struct {
	u32		blocks;			/* Number of blocks */
#if defined(__LITTLE_ENDIAN_BITFIELD)
	unsigned	dc		:2;	/* Descriptor Code */
	unsigned	reserved	:6;
#elif defined(__BIG_ENDIAN_BITFIELD)
	unsigned	reserved	:6;
	unsigned	dc		:2;	/* Descriptor Code */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
	u8		length_msb;		/* Block Length (MSB)*/
	u16		length;			/* Block Length */
} idefloppy_capacity_descriptor_t;

#define CAPACITY_INVALID	0x00
#define CAPACITY_UNFORMATTED	0x01
#define CAPACITY_CURRENT	0x02
#define CAPACITY_NO_CARTRIDGE	0x03

/*
 *	Most of our global data which we need to save even as we leave the
 *	driver due to an interrupt or a timer event is stored in a variable
 *	of type idefloppy_floppy_t, defined below.
 */
typedef struct ide_floppy_obj {
	ide_drive_t	*drive;
	ide_driver_t	*driver;
	struct gendisk	*disk;
	struct kref	kref;
	unsigned int	openers;	/* protected by BKL for now */

	/* Current packet command */
	idefloppy_pc_t *pc;
	/* Last failed packet command */
	idefloppy_pc_t *failed_pc;
	/* Packet command stack */
	idefloppy_pc_t pc_stack[IDEFLOPPY_PC_STACK];
	/* Next free packet command storage space */
	int pc_stack_index;
	struct request rq_stack[IDEFLOPPY_PC_STACK];
	/* We implement a circular array */
	int rq_stack_index;

	/*
	 *	Last error information
	 */
	u8 sense_key, asc, ascq;
	/* delay this long before sending packet command */
	u8 ticks;
	int progress_indication;

	/*
	 *	Device information
	 */
	/* Current format */
	int blocks, block_size, bs_factor;
	/* Last format capacity */
	idefloppy_capacity_descriptor_t capacity;
	/* Copy of the flexible disk page */
	idefloppy_flexible_disk_page_t flexible_disk_page;
	/* Write protect */
	int wp;
	/* Supports format progress report */
	int srfp;
	/* Status/Action flags */
	unsigned long flags;
} idefloppy_floppy_t;

#define IDEFLOPPY_TICKS_DELAY	HZ/20	/* default delay for ZIP 100 (50ms) */

/*
 *	Floppy flag bits values.
 */
#define IDEFLOPPY_DRQ_INTERRUPT		0	/* DRQ interrupt device */
#define IDEFLOPPY_MEDIA_CHANGED		1	/* Media may have changed */
#define IDEFLOPPY_USE_READ12		2	/* Use READ12/WRITE12 or READ10/WRITE10 */
#define	IDEFLOPPY_FORMAT_IN_PROGRESS	3	/* Format in progress */
#define IDEFLOPPY_CLIK_DRIVE	        4       /* Avoid commands not supported in Clik drive */
#define IDEFLOPPY_ZIP_DRIVE		5	/* Requires BH algorithm for packets */

/*
 *	ATAPI floppy drive packet commands
 */
#define IDEFLOPPY_FORMAT_UNIT_CMD	0x04
#define IDEFLOPPY_INQUIRY_CMD		0x12
#define IDEFLOPPY_MODE_SELECT_CMD	0x55
#define IDEFLOPPY_MODE_SENSE_CMD	0x5a
#define IDEFLOPPY_READ10_CMD		0x28
#define IDEFLOPPY_READ12_CMD		0xa8
#define IDEFLOPPY_READ_CAPACITY_CMD	0x23
#define IDEFLOPPY_REQUEST_SENSE_CMD	0x03
#define IDEFLOPPY_PREVENT_REMOVAL_CMD	0x1e
#define IDEFLOPPY_SEEK_CMD		0x2b
#define IDEFLOPPY_START_STOP_CMD	0x1b
#define IDEFLOPPY_TEST_UNIT_READY_CMD	0x00
#define IDEFLOPPY_VERIFY_CMD		0x2f
#define IDEFLOPPY_WRITE10_CMD		0x2a
#define IDEFLOPPY_WRITE12_CMD		0xaa
#define IDEFLOPPY_WRITE_VERIFY_CMD	0x2e

/*
 *	Defines for the mode sense command
 */
#define MODE_SENSE_CURRENT		0x00
#define MODE_SENSE_CHANGEABLE		0x01
#define MODE_SENSE_DEFAULT		0x02 
#define MODE_SENSE_SAVED		0x03

/*
 *	IOCTLs used in low-level formatting.
 */

#define	IDEFLOPPY_IOCTL_FORMAT_SUPPORTED	0x4600
#define	IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY	0x4601
#define	IDEFLOPPY_IOCTL_FORMAT_START		0x4602
#define IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS	0x4603

#if 0
/*
 *	Special requests for our block device strategy routine.
 */
#define	IDEFLOPPY_FIRST_RQ	90

/*
 * 	IDEFLOPPY_PC_RQ is used to queue a packet command in the request queue.
 */
#define	IDEFLOPPY_PC_RQ		90

#define IDEFLOPPY_LAST_RQ	90

/*
 *	A macro which can be used to check if a given request command
 *	originated in the driver or in the buffer cache layer.
 */
#define IDEFLOPPY_RQ_CMD(cmd) 	((cmd >= IDEFLOPPY_FIRST_RQ) && (cmd <= IDEFLOPPY_LAST_RQ))

#endif

/*
 *	Error codes which are returned in rq->errors to the higher part
 *	of the driver.
 */
#define	IDEFLOPPY_ERROR_GENERAL		101

/*
 *	The following is used to format the general configuration word of
 *	the ATAPI IDENTIFY DEVICE command.
 */
struct idefloppy_id_gcw {	
#if defined(__LITTLE_ENDIAN_BITFIELD)
	unsigned packet_size		:2;	/* Packet Size */
	unsigned reserved234		:3;	/* Reserved */
	unsigned drq_type		:2;	/* Command packet DRQ type */
	unsigned removable		:1;	/* Removable media */
	unsigned device_type		:5;	/* Device type */
	unsigned reserved13		:1;	/* Reserved */
	unsigned protocol		:2;	/* Protocol type */
#elif defined(__BIG_ENDIAN_BITFIELD)
	unsigned protocol		:2;	/* Protocol type */
	unsigned reserved13		:1;	/* Reserved */
	unsigned device_type		:5;	/* Device type */
	unsigned removable		:1;	/* Removable media */
	unsigned drq_type		:2;	/* Command packet DRQ type */
	unsigned reserved234		:3;	/* Reserved */
	unsigned packet_size		:2;	/* Packet Size */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
};

/*
 *	INQUIRY packet command - Data Format
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	unsigned	device_type	:5;	/* Peripheral Device Type */
	unsigned	reserved0_765	:3;	/* Peripheral Qualifier - Reserved */
	unsigned	reserved1_6t0	:7;	/* Reserved */
	unsigned	rmb		:1;	/* Removable Medium Bit */
	unsigned	ansi_version	:3;	/* ANSI Version */
	unsigned	ecma_version	:3;	/* ECMA Version */
	unsigned	iso_version	:2;	/* ISO Version */
	unsigned	response_format :4;	/* Response Data Format */
	unsigned	reserved3_45	:2;	/* Reserved */
	unsigned	reserved3_6	:1;	/* TrmIOP - Reserved */
	unsigned	reserved3_7	:1;	/* AENC - Reserved */
#elif defined(__BIG_ENDIAN_BITFIELD)
	unsigned	reserved0_765	:3;	/* Peripheral Qualifier - Reserved */
	unsigned	device_type	:5;	/* Peripheral Device Type */
	unsigned	rmb		:1;	/* Removable Medium Bit */
	unsigned	reserved1_6t0	:7;	/* Reserved */
	unsigned	iso_version	:2;	/* ISO Version */
	unsigned	ecma_version	:3;	/* ECMA Version */
	unsigned	ansi_version	:3;	/* ANSI Version */
	unsigned	reserved3_7	:1;	/* AENC - Reserved */
	unsigned	reserved3_6	:1;	/* TrmIOP - Reserved */
	unsigned	reserved3_45	:2;	/* Reserved */
	unsigned	response_format :4;	/* Response Data Format */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
	u8		additional_length;	/* Additional Length (total_length-4) */
	u8		rsv5, rsv6, rsv7;	/* Reserved */
	u8		vendor_id[8];		/* Vendor Identification */
	u8		product_id[16];		/* Product Identification */
	u8		revision_level[4];	/* Revision Level */
	u8		vendor_specific[20];	/* Vendor Specific - Optional */
	u8		reserved56t95[40];	/* Reserved - Optional */
						/* Additional information may be returned */
} idefloppy_inquiry_result_t;

/*
 *	REQUEST SENSE packet command result - Data Format.
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	unsigned	error_code	:7;	/* Current error (0x70) */
	unsigned	valid		:1;	/* The information field conforms to SFF-8070i */
	u8		reserved1	:8;	/* Reserved */
	unsigned	sense_key	:4;	/* Sense Key */
	unsigned	reserved2_4	:1;	/* Reserved */
	unsigned	ili		:1;	/* Incorrect Length Indicator */
	unsigned	reserved2_67	:2;
#elif defined(__BIG_ENDIAN_BITFIELD)
	unsigned	valid		:1;	/* The information field conforms to SFF-8070i */
	unsigned	error_code	:7;	/* Current error (0x70) */
	u8		reserved1	:8;	/* Reserved */
	unsigned	reserved2_67	:2;
	unsigned	ili		:1;	/* Incorrect Length Indicator */
	unsigned	reserved2_4	:1;	/* Reserved */
	unsigned	sense_key	:4;	/* Sense Key */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
	u32		information __attribute__ ((packed));
	u8		asl;			/* Additional sense length (n-7) */
	u32		command_specific;	/* Additional command specific information */
	u8		asc;			/* Additional Sense Code */
	u8		ascq;			/* Additional Sense Code Qualifier */
	u8		replaceable_unit_code;	/* Field Replaceable Unit Code */
	u8		sksv[3];
	u8		pad[2];			/* Padding to 20 bytes */
} idefloppy_request_sense_result_t;

/*
 *	Pages of the SELECT SENSE / MODE SENSE packet commands.
 */
#define	IDEFLOPPY_CAPABILITIES_PAGE	0x1b
#define IDEFLOPPY_FLEXIBLE_DISK_PAGE	0x05

/*
 *	Mode Parameter Header for the MODE SENSE packet command
 */
typedef struct {
	u16		mode_data_length;	/* Length of the following data transfer */
	u8		medium_type;		/* Medium Type */
#if defined(__LITTLE_ENDIAN_BITFIELD)
	unsigned	reserved3	:7;
	unsigned	wp		:1;	/* Write protect */
#elif defined(__BIG_ENDIAN_BITFIELD)
	unsigned	wp		:1;	/* Write protect */
	unsigned	reserved3	:7;
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
	u8		reserved[4];
} idefloppy_mode_parameter_header_t;

static DEFINE_MUTEX(idefloppy_ref_mutex);

#define to_ide_floppy(obj) container_of(obj, struct ide_floppy_obj, kref)

#define ide_floppy_g(disk) \
	container_of((disk)->private_data, struct ide_floppy_obj, driver)

static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
{
	struct ide_floppy_obj *floppy = NULL;

	mutex_lock(&idefloppy_ref_mutex);
	floppy = ide_floppy_g(disk);
	if (floppy)
		kref_get(&floppy->kref);
	mutex_unlock(&idefloppy_ref_mutex);
	return floppy;
}

static void ide_floppy_release(struct kref *);

static void ide_floppy_put(struct ide_floppy_obj *floppy)
{
	mutex_lock(&idefloppy_ref_mutex);
	kref_put(&floppy->kref, ide_floppy_release);
	mutex_unlock(&idefloppy_ref_mutex);
}

/*
 *	Too bad. The drive wants to send us data which we are not ready to accept.
 *	Just throw it away.
 */
static void idefloppy_discard_data (ide_drive_t *drive, unsigned int bcount)
{
	while (bcount--)
		(void) HWIF(drive)->INB(IDE_DATA_REG);
}

#if IDEFLOPPY_DEBUG_BUGS
static void idefloppy_write_zeros (ide_drive_t *drive, unsigned int bcount)
{
	while (bcount--)
		HWIF(drive)->OUTB(0, IDE_DATA_REG);
}
#endif /* IDEFLOPPY_DEBUG_BUGS */


/*
 *	idefloppy_do_end_request is used to finish servicing a request.
 *
 *	For read/write requests, we will call ide_end_request to pass to the
 *	next buffer.
 */
static int idefloppy_do_end_request(ide_drive_t *drive, int uptodate, int nsecs)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct request *rq = HWGROUP(drive)->rq;
	int error;

	debug_log(KERN_INFO "Reached idefloppy_end_request\n");

	switch (uptodate) {
		case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
		case 1: error = 0; break;
		default: error = uptodate;
	}
	if (error)
		floppy->failed_pc = NULL;
	/* Why does this happen? */
	if (!rq)
		return 0;
	if (!blk_special_request(rq)) {
		/* our real local end request function */
		ide_end_request(drive, uptodate, nsecs);
		return 0;
	}
	rq->errors = error;
	/* fixme: need to move this local also */
	ide_end_drive_cmd(drive, 0, 0);
	return 0;
}

static void idefloppy_input_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
{
	struct request *rq = pc->rq;
	struct bio_vec *bvec;
	struct bio *bio;
	unsigned long flags;
	char *data;
	int count, i, done = 0;

	rq_for_each_bio(bio, rq) {
		bio_for_each_segment(bvec, bio, i) {
			if (!bcount)
				break;

			count = min(bvec->bv_len, bcount);

			data = bvec_kmap_irq(bvec, &flags);
			drive->hwif->atapi_input_bytes(drive, data, count);
			bvec_kunmap_irq(data, &flags);

			bcount -= count;
			pc->b_count += count;
			done += count;
		}
	}

	idefloppy_do_end_request(drive, 1, done >> 9);

	if (bcount) {
		printk(KERN_ERR "%s: leftover data in idefloppy_input_buffers, bcount == %d\n", drive->name, bcount);
		idefloppy_discard_data(drive, bcount);
	}
}

static void idefloppy_output_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
{
	struct request *rq = pc->rq;
	struct bio *bio;
	struct bio_vec *bvec;
	unsigned long flags;
	int count, i, done = 0;
	char *data;

	rq_for_each_bio(bio, rq) {
		bio_for_each_segment(bvec, bio, i) {
			if (!bcount)
				break;

			count = min(bvec->bv_len, bcount);

			data = bvec_kmap_irq(bvec, &flags);
			drive->hwif->atapi_output_bytes(drive, data, count);
			bvec_kunmap_irq(data, &flags);

			bcount -= count;
			pc->b_count += count;
			done += count;
		}
	}

	idefloppy_do_end_request(drive, 1, done >> 9);

#if IDEFLOPPY_DEBUG_BUGS
	if (bcount) {
		printk(KERN_ERR "%s: leftover data in idefloppy_output_buffers, bcount == %d\n", drive->name, bcount);
		idefloppy_write_zeros(drive, bcount);
	}
#endif
}

static void idefloppy_update_buffers (ide_drive_t *drive, idefloppy_pc_t *pc)
{
	struct request *rq = pc->rq;
	struct bio *bio = rq->bio;

	while ((bio = rq->bio) != NULL)
		idefloppy_do_end_request(drive, 1, 0);
}

/*
 *	idefloppy_queue_pc_head generates a new packet command request in front
 *	of the request queue, before the current request, so that it will be
 *	processed immediately, on the next pass through the driver.
 */
static void idefloppy_queue_pc_head (ide_drive_t *drive,idefloppy_pc_t *pc,struct request *rq)
{
	struct ide_floppy_obj *floppy = drive->driver_data;

	ide_init_drive_cmd(rq);
	rq->buffer = (char *) pc;
	rq->cmd_type = REQ_TYPE_SPECIAL;
	rq->rq_disk = floppy->disk;
	(void) ide_do_drive_cmd(drive, rq, ide_preempt);
}

static idefloppy_pc_t *idefloppy_next_pc_storage (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;

	if (floppy->pc_stack_index == IDEFLOPPY_PC_STACK)
		floppy->pc_stack_index=0;
	return (&floppy->pc_stack[floppy->pc_stack_index++]);
}

static struct request *idefloppy_next_rq_storage (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;

	if (floppy->rq_stack_index == IDEFLOPPY_PC_STACK)
		floppy->rq_stack_index = 0;
	return (&floppy->rq_stack[floppy->rq_stack_index++]);
}

/*
 *	idefloppy_analyze_error is called on each failed packet command retry
 *	to analyze the request sense.
 */
static void idefloppy_analyze_error (ide_drive_t *drive,idefloppy_request_sense_result_t *result)
{
	idefloppy_floppy_t *floppy = drive->driver_data;

	floppy->sense_key = result->sense_key;
	floppy->asc = result->asc;
	floppy->ascq = result->ascq;
	floppy->progress_indication = result->sksv[0] & 0x80 ?
		(u16)get_unaligned((u16 *)(result->sksv+1)):0x10000;
	if (floppy->failed_pc)
		debug_log(KERN_INFO "ide-floppy: pc = %x, sense key = %x, "
			"asc = %x, ascq = %x\n", floppy->failed_pc->c[0],
			result->sense_key, result->asc, result->ascq);
	else
		debug_log(KERN_INFO "ide-floppy: sense key = %x, asc = %x, "
			"ascq = %x\n", result->sense_key,
			result->asc, result->ascq);
}

static void idefloppy_request_sense_callback (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;

	debug_log(KERN_INFO "ide-floppy: Reached %s\n", __FUNCTION__);
	
	if (!floppy->pc->error) {
		idefloppy_analyze_error(drive,(idefloppy_request_sense_result_t *) floppy->pc->buffer);
		idefloppy_do_end_request(drive, 1, 0);
	} else {
		printk(KERN_ERR "Error in REQUEST SENSE itself - Aborting request!\n");
		idefloppy_do_end_request(drive, 0, 0);
	}
}

/*
 *	General packet command callback function.
 */
static void idefloppy_pc_callback (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	
	debug_log(KERN_INFO "ide-floppy: Reached %s\n", __FUNCTION__);

	idefloppy_do_end_request(drive, floppy->pc->error ? 0 : 1, 0);
}

/*
 *	idefloppy_init_pc initializes a packet command.
 */
static void idefloppy_init_pc (idefloppy_pc_t *pc)
{
	memset(pc->c, 0, 12);
	pc->retries = 0;
	pc->flags = 0;
	pc->request_transfer = 0;
	pc->buffer = pc->pc_buffer;
	pc->buffer_size = IDEFLOPPY_PC_BUFFER_SIZE;
	pc->callback = &idefloppy_pc_callback;
}

static void idefloppy_create_request_sense_cmd (idefloppy_pc_t *pc)
{
	idefloppy_init_pc(pc);	
	pc->c[0] = IDEFLOPPY_REQUEST_SENSE_CMD;
	pc->c[4] = 255;
	pc->request_transfer = 18;
	pc->callback = &idefloppy_request_sense_callback;
}

/*
 *	idefloppy_retry_pc is called when an error was detected during the
 *	last packet command. We queue a request sense packet command in
 *	the head of the request list.
 */
static void idefloppy_retry_pc (ide_drive_t *drive)
{
	idefloppy_pc_t *pc;
	struct request *rq;
	atapi_error_t error;

	error.all = HWIF(drive)->INB(IDE_ERROR_REG);
	pc = idefloppy_next_pc_storage(drive);
	rq = idefloppy_next_rq_storage(drive);
	idefloppy_create_request_sense_cmd(pc);
	idefloppy_queue_pc_head(drive, pc, rq);
}

/*
 *	idefloppy_pc_intr is the usual interrupt handler which will be called
 *	during a packet command.
 */
static ide_startstop_t idefloppy_pc_intr (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	atapi_status_t status;
	atapi_bcount_t bcount;
	atapi_ireason_t ireason;
	idefloppy_pc_t *pc = floppy->pc;
	struct request *rq = pc->rq;
	unsigned int temp;

	debug_log(KERN_INFO "ide-floppy: Reached %s interrupt handler\n",
		__FUNCTION__);

	if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
		if (HWIF(drive)->ide_dma_end(drive)) {
			set_bit(PC_DMA_ERROR, &pc->flags);
		} else {
			pc->actually_transferred = pc->request_transfer;
			idefloppy_update_buffers(drive, pc);
		}
		debug_log(KERN_INFO "ide-floppy: DMA finished\n");
	}

	/* Clear the interrupt */
	status.all = HWIF(drive)->INB(IDE_STATUS_REG);

	if (!status.b.drq) {			/* No more interrupts */
		debug_log(KERN_INFO "Packet command completed, %d bytes "
			"transferred\n", pc->actually_transferred);
		clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);

		local_irq_enable_in_hardirq();

		if (status.b.check || test_bit(PC_DMA_ERROR, &pc->flags)) {
			/* Error detected */
			debug_log(KERN_INFO "ide-floppy: %s: I/O error\n",
				drive->name);
			rq->errors++;
			if (pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
				printk(KERN_ERR "ide-floppy: I/O error in "
					"request sense command\n");
				return ide_do_reset(drive);
			}
			/* Retry operation */
			idefloppy_retry_pc(drive);
			/* queued, but not started */
			return ide_stopped;
		}
		pc->error = 0;
		if (floppy->failed_pc == pc)
			floppy->failed_pc = NULL;
		/* Command finished - Call the callback function */
		pc->callback(drive);
		return ide_stopped;
	}

	if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
		printk(KERN_ERR "ide-floppy: The floppy wants to issue "
			"more interrupts in DMA mode\n");
		(void)__ide_dma_off(drive);
		return ide_do_reset(drive);
	}

	/* Get the number of bytes to transfer */
	bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
	bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
	/* on this interrupt */
	ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);

	if (ireason.b.cod) {
		printk(KERN_ERR "ide-floppy: CoD != 0 in idefloppy_pc_intr\n");
		return ide_do_reset(drive);
	}
	if (ireason.b.io == test_bit(PC_WRITING, &pc->flags)) {
		/* Hopefully, we will never get here */
		printk(KERN_ERR "ide-floppy: We wanted to %s, ",
			ireason.b.io ? "Write":"Read");
		printk(KERN_ERR "but the floppy wants us to %s !\n",
			ireason.b.io ? "Read":"Write");
		return ide_do_reset(drive);
	}
	if (!test_bit(PC_WRITING, &pc->flags)) {
		/* Reading - Check that we have enough space */
		temp = pc->actually_transferred + bcount.all;
		if (temp > pc->request_transfer) {
			if (temp > pc->buffer_size) {
				printk(KERN_ERR "ide-floppy: The floppy wants "
					"to send us more data than expected "
					"- discarding data\n");
				idefloppy_discard_data(drive,bcount.all);
				BUG_ON(HWGROUP(drive)->handler != NULL);
				ide_set_handler(drive,
						&idefloppy_pc_intr,
						IDEFLOPPY_WAIT_CMD,
						NULL);
				return ide_started;
			}
			debug_log(KERN_NOTICE "ide-floppy: The floppy wants to "
				"send us more data than expected - "
				"allowing transfer\n");
		}
	}
	if (test_bit(PC_WRITING, &pc->flags)) {
		if (pc->buffer != NULL)
			/* Write the current buffer */
			HWIF(drive)->atapi_output_bytes(drive,
						pc->current_position,
						bcount.all);
		else
			idefloppy_output_buffers(drive, pc, bcount.all);
	} else {
		if (pc->buffer != NULL)
			/* Read the current buffer */
			HWIF(drive)->atapi_input_bytes(drive,
						pc->current_position,
						bcount.all);
		else
			idefloppy_input_buffers(drive, pc, bcount.all);
	}
	/* Update the current position */
	pc->actually_transferred += bcount.all;
	pc->current_position += bcount.all;

	BUG_ON(HWGROUP(drive)->handler != NULL);
	ide_set_handler(drive, &idefloppy_pc_intr, IDEFLOPPY_WAIT_CMD, NULL);		/* And set the interrupt handler again */
	return ide_started;
}

/*
 * This is the original routine that did the packet transfer.
 * It fails at high speeds on the Iomega ZIP drive, so there's a slower version
 * for that drive below. The algorithm is chosen based on drive type
 */
static ide_startstop_t idefloppy_transfer_pc (ide_drive_t *drive)
{
	ide_startstop_t startstop;
	idefloppy_floppy_t *floppy = drive->driver_data;
	atapi_ireason_t ireason;

	if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
		printk(KERN_ERR "ide-floppy: Strange, packet command "
				"initiated yet DRQ isn't asserted\n");
		return startstop;
	}
	ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
	if (!ireason.b.cod || ireason.b.io) {
		printk(KERN_ERR "ide-floppy: (IO,CoD) != (0,1) while "
				"issuing a packet command\n");
		return ide_do_reset(drive);
	}
	BUG_ON(HWGROUP(drive)->handler != NULL);
	/* Set the interrupt routine */
	ide_set_handler(drive, &idefloppy_pc_intr, IDEFLOPPY_WAIT_CMD, NULL);
	/* Send the actual packet */
	HWIF(drive)->atapi_output_bytes(drive, floppy->pc->c, 12);
	return ide_started;
}


/*
 * What we have here is a classic case of a top half / bottom half
 * interrupt service routine. In interrupt mode, the device sends
 * an interrupt to signal it's ready to receive a packet. However,
 * we need to delay about 2-3 ticks before issuing the packet or we
 * gets in trouble.
 *
 * So, follow carefully. transfer_pc1 is called as an interrupt (or
 * directly). In either case, when the device says it's ready for a 
 * packet, we schedule the packet transfer to occur about 2-3 ticks
 * later in transfer_pc2.
 */
static int idefloppy_transfer_pc2 (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;

	/* Send the actual packet */
	HWIF(drive)->atapi_output_bytes(drive, floppy->pc->c, 12);
	/* Timeout for the packet command */
	return IDEFLOPPY_WAIT_CMD;
}

static ide_startstop_t idefloppy_transfer_pc1 (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	ide_startstop_t startstop;
	atapi_ireason_t ireason;

	if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
		printk(KERN_ERR "ide-floppy: Strange, packet command "
				"initiated yet DRQ isn't asserted\n");
		return startstop;
	}
	ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
	if (!ireason.b.cod || ireason.b.io) {
		printk(KERN_ERR "ide-floppy: (IO,CoD) != (0,1) "
				"while issuing a packet command\n");
		return ide_do_reset(drive);
	}
	/* 
	 * The following delay solves a problem with ATAPI Zip 100 drives
	 * where the Busy flag was apparently being deasserted before the
	 * unit was ready to receive data. This was happening on a
	 * 1200 MHz Athlon system. 10/26/01 25msec is too short,
	 * 40 and 50msec work well. idefloppy_pc_intr will not be actually
	 * used until after the packet is moved in about 50 msec.
	 */
	BUG_ON(HWGROUP(drive)->handler != NULL);
	ide_set_handler(drive, 
	  &idefloppy_pc_intr, 		/* service routine for packet command */
	  floppy->ticks,		/* wait this long before "failing" */
	  &idefloppy_transfer_pc2);	/* fail == transfer_pc2 */
	return ide_started;
}

/**
 * idefloppy_should_report_error()
 *
 * Supresses error messages resulting from Medium not present
 */
static inline int idefloppy_should_report_error(idefloppy_floppy_t *floppy)
{
	if (floppy->sense_key == 0x02 &&
	    floppy->asc       == 0x3a &&
	    floppy->ascq      == 0x00)
		return 0;
	return 1;
}

/*
 *	Issue a packet command
 */
static ide_startstop_t idefloppy_issue_pc (ide_drive_t *drive, idefloppy_pc_t *pc)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	ide_hwif_t *hwif = drive->hwif;
	atapi_feature_t feature;
	atapi_bcount_t bcount;
	ide_handler_t *pkt_xfer_routine;

#if 0 /* Accessing floppy->pc is not valid here, the previous pc may be gone
         and have lived on another thread's stack; that stack may have become
         unmapped meanwhile (CONFIG_DEBUG_PAGEALLOC). */
#if IDEFLOPPY_DEBUG_BUGS
	if (floppy->pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD &&
	    pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
		printk(KERN_ERR "ide-floppy: possible ide-floppy.c bug - "
			"Two request sense in serial were issued\n");
	}
#endif /* IDEFLOPPY_DEBUG_BUGS */
#endif

	if (floppy->failed_pc == NULL &&
	    pc->c[0] != IDEFLOPPY_REQUEST_SENSE_CMD)
		floppy->failed_pc = pc;
	/* Set the current packet command */
	floppy->pc = pc;

	if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES ||
	    test_bit(PC_ABORT, &pc->flags)) {
		/*
		 *	We will "abort" retrying a packet command in case
		 *	a legitimate error code was received.
		 */
		if (!test_bit(PC_ABORT, &pc->flags)) {
			if (!test_bit(PC_SUPPRESS_ERROR, &pc->flags)) {
				if (idefloppy_should_report_error(floppy))
					printk(KERN_ERR "ide-floppy: %s: I/O error, "
					       "pc = %2x, key = %2x, "
					       "asc = %2x, ascq = %2x\n",
					       drive->name, pc->c[0],
					       floppy->sense_key,
					       floppy->asc, floppy->ascq);
			}
			/* Giving up */
			pc->error = IDEFLOPPY_ERROR_GENERAL;
		}
		floppy->failed_pc = NULL;
		pc->callback(drive);
		return ide_stopped;
	}

	debug_log(KERN_INFO "Retry number - %d\n",pc->retries);

	pc->retries++;
	/* We haven't transferred any data yet */
	pc->actually_transferred = 0;
	pc->current_position = pc->buffer;
	bcount.all = min(pc->request_transfer, 63 * 1024);

	if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
		(void)__ide_dma_off(drive);
	}
	feature.all = 0;

	if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
		feature.b.dma = !hwif->dma_setup(drive);

	if (IDE_CONTROL_REG)
		HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
	/* Use PIO/DMA */
	HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
	HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
	HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
	HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);

	if (feature.b.dma) {	/* Begin DMA, if necessary */
		set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
		hwif->dma_start(drive);
	}

	/* Can we transfer the packet when we get the interrupt or wait? */
	if (test_bit(IDEFLOPPY_ZIP_DRIVE, &floppy->flags)) {
		/* wait */
		pkt_xfer_routine = &idefloppy_transfer_pc1;
	} else {
		/* immediate */
		pkt_xfer_routine = &idefloppy_transfer_pc;
	}
	
	if (test_bit (IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags)) {
		/* Issue the packet command */
		ide_execute_command(drive, WIN_PACKETCMD,
				pkt_xfer_routine,
				IDEFLOPPY_WAIT_CMD,
				NULL);
		return ide_started;
	} else {
		/* Issue the packet command */
		HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
		return (*pkt_xfer_routine) (drive);
	}
}

static void idefloppy_rw_callback (ide_drive_t *drive)
{
	debug_log(KERN_INFO "ide-floppy: Reached idefloppy_rw_callback\n");

	idefloppy_do_end_request(drive, 1, 0);
	return;
}

static void idefloppy_create_prevent_cmd (idefloppy_pc_t *pc, int prevent)
{
	debug_log(KERN_INFO "ide-floppy: creating prevent removal command, "
		"prevent = %d\n", prevent);

	idefloppy_init_pc(pc);
	pc->c[0] = IDEFLOPPY_PREVENT_REMOVAL_CMD;
	pc->c[4] = prevent;
}

static void idefloppy_create_read_capacity_cmd (idefloppy_pc_t *pc)
{
	idefloppy_init_pc(pc);
	pc->c[0] = IDEFLOPPY_READ_CAPACITY_CMD;
	pc->c[7] = 255;
	pc->c[8] = 255;
	pc->request_transfer = 255;
}

static void idefloppy_create_format_unit_cmd (idefloppy_pc_t *pc, int b, int l,
					      int flags)
{
	idefloppy_init_pc(pc);
	pc->c[0] = IDEFLOPPY_FORMAT_UNIT_CMD;
	pc->c[1] = 0x17;

	memset(pc->buffer, 0, 12);
	pc->buffer[1] = 0xA2;
	/* Default format list header, u8 1: FOV/DCRT/IMM bits set */

	if (flags & 1)				/* Verify bit on... */
		pc->buffer[1] ^= 0x20;		/* ... turn off DCRT bit */
	pc->buffer[3] = 8;

	put_unaligned(htonl(b), (unsigned int *)(&pc->buffer[4]));
	put_unaligned(htonl(l), (unsigned int *)(&pc->buffer[8]));
	pc->buffer_size=12;
	set_bit(PC_WRITING, &pc->flags);
}

/*
 *	A mode sense command is used to "sense" floppy parameters.
 */
static void idefloppy_create_mode_sense_cmd (idefloppy_pc_t *pc, u8 page_code, u8 type)
{
	u16 length = sizeof(idefloppy_mode_parameter_header_t);
	
	idefloppy_init_pc(pc);
	pc->c[0] = IDEFLOPPY_MODE_SENSE_CMD;
	pc->c[1] = 0;
	pc->c[2] = page_code + (type << 6);

	switch (page_code) {
		case IDEFLOPPY_CAPABILITIES_PAGE:
			length += 12;
			break;
		case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
			length += 32;
			break;
		default:
			printk(KERN_ERR "ide-floppy: unsupported page code "
				"in create_mode_sense_cmd\n");
	}
	put_unaligned(htons(length), (u16 *) &pc->c[7]);
	pc->request_transfer = length;
}

static void idefloppy_create_start_stop_cmd (idefloppy_pc_t *pc, int start)
{
	idefloppy_init_pc(pc);
	pc->c[0] = IDEFLOPPY_START_STOP_CMD;
	pc->c[4] = start;
}

static void idefloppy_create_test_unit_ready_cmd(idefloppy_pc_t *pc)
{
	idefloppy_init_pc(pc);
	pc->c[0] = IDEFLOPPY_TEST_UNIT_READY_CMD;
}

static void idefloppy_create_rw_cmd (idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct request *rq, unsigned long sector)
{
	int block = sector / floppy->bs_factor;
	int blocks = rq->nr_sectors / floppy->bs_factor;
	int cmd = rq_data_dir(rq);

	debug_log("create_rw1%d_cmd: block == %d, blocks == %d\n",
		2 * test_bit (IDEFLOPPY_USE_READ12, &floppy->flags),
		block, blocks);

	idefloppy_init_pc(pc);
	if (test_bit(IDEFLOPPY_USE_READ12, &floppy->flags)) {
		pc->c[0] = cmd == READ ? IDEFLOPPY_READ12_CMD : IDEFLOPPY_WRITE12_CMD;
		put_unaligned(htonl(blocks), (unsigned int *) &pc->c[6]);
	} else {
		pc->c[0] = cmd == READ ? IDEFLOPPY_READ10_CMD : IDEFLOPPY_WRITE10_CMD;
		put_unaligned(htons(blocks), (unsigned short *) &pc->c[7]);
	}
	put_unaligned(htonl(block), (unsigned int *) &pc->c[2]);
	pc->callback = &idefloppy_rw_callback;
	pc->rq = rq;
	pc->b_count = cmd == READ ? 0 : rq->bio->bi_size;
	if (rq->cmd_flags & REQ_RW)
		set_bit(PC_WRITING, &pc->flags);
	pc->buffer = NULL;
	pc->request_transfer = pc->buffer_size = blocks * floppy->block_size;
	set_bit(PC_DMA_RECOMMENDED, &pc->flags);
}

static int
idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct request *rq)
{
	/*
	 * just support eject for now, it would not be hard to make the
	 * REQ_BLOCK_PC support fully-featured
	 */
	if (rq->cmd[0] != IDEFLOPPY_START_STOP_CMD)
		return 1;

	idefloppy_init_pc(pc);
	memcpy(pc->c, rq->cmd, sizeof(pc->c));
	return 0;
}

/*
 *	idefloppy_do_request is our request handling function.	
 */
static ide_startstop_t idefloppy_do_request (ide_drive_t *drive, struct request *rq, sector_t block_s)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t *pc;
	unsigned long block = (unsigned long)block_s;

	debug_log(KERN_INFO "dev: %s, flags: %lx, errors: %d\n",
			rq->rq_disk ? rq->rq_disk->disk_name : "?",
			rq->flags, rq->errors);
	debug_log(KERN_INFO "sector: %ld, nr_sectors: %ld, "
			"current_nr_sectors: %d\n", (long)rq->sector,
			rq->nr_sectors, rq->current_nr_sectors);

	if (rq->errors >= ERROR_MAX) {
		if (floppy->failed_pc != NULL) {
			if (idefloppy_should_report_error(floppy))
				printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x,"
				       " key = %2x, asc = %2x, ascq = %2x\n",
				       drive->name, floppy->failed_pc->c[0],
				       floppy->sense_key, floppy->asc, floppy->ascq);
		}
		else
			printk(KERN_ERR "ide-floppy: %s: I/O error\n",
				drive->name);
		idefloppy_do_end_request(drive, 0, 0);
		return ide_stopped;
	}
	if (blk_fs_request(rq)) {
		if (((long)rq->sector % floppy->bs_factor) ||
		    (rq->nr_sectors % floppy->bs_factor)) {
			printk("%s: unsupported r/w request size\n",
				drive->name);
			idefloppy_do_end_request(drive, 0, 0);
			return ide_stopped;
		}
		pc = idefloppy_next_pc_storage(drive);
		idefloppy_create_rw_cmd(floppy, pc, rq, block);
	} else if (blk_special_request(rq)) {
		pc = (idefloppy_pc_t *) rq->buffer;
	} else if (blk_pc_request(rq)) {
		pc = idefloppy_next_pc_storage(drive);
		if (idefloppy_blockpc_cmd(floppy, pc, rq)) {
			idefloppy_do_end_request(drive, 0, 0);
			return ide_stopped;
		}
	} else {
		blk_dump_rq_flags(rq,
			"ide-floppy: unsupported command in queue");
		idefloppy_do_end_request(drive, 0, 0);
		return ide_stopped;
	}

	pc->rq = rq;
	return idefloppy_issue_pc(drive, pc);
}

/*
 *	idefloppy_queue_pc_tail adds a special packet command request to the
 *	tail of the request queue, and waits for it to be serviced.
 */
static int idefloppy_queue_pc_tail (ide_drive_t *drive,idefloppy_pc_t *pc)
{
	struct ide_floppy_obj *floppy = drive->driver_data;
	struct request rq;

	ide_init_drive_cmd (&rq);
	rq.buffer = (char *) pc;
	rq.cmd_type = REQ_TYPE_SPECIAL;
	rq.rq_disk = floppy->disk;

	return ide_do_drive_cmd(drive, &rq, ide_wait);
}

/*
 *	Look at the flexible disk page parameters. We will ignore the CHS
 *	capacity parameters and use the LBA parameters instead.
 */
static int idefloppy_get_flexible_disk_page (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t pc;
	idefloppy_mode_parameter_header_t *header;
	idefloppy_flexible_disk_page_t *page;
	int capacity, lba_capacity;

	idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE, MODE_SENSE_CURRENT);
	if (idefloppy_queue_pc_tail(drive,&pc)) {
		printk(KERN_ERR "ide-floppy: Can't get flexible disk "
			"page parameters\n");
		return 1;
	}
	header = (idefloppy_mode_parameter_header_t *) pc.buffer;
	floppy->wp = header->wp;
	set_disk_ro(floppy->disk, floppy->wp);
	page = (idefloppy_flexible_disk_page_t *) (header + 1);

	page->transfer_rate = ntohs(page->transfer_rate);
	page->sector_size = ntohs(page->sector_size);
	page->cyls = ntohs(page->cyls);
	page->rpm = ntohs(page->rpm);
	capacity = page->cyls * page->heads * page->sectors * page->sector_size;
	if (memcmp (page, &floppy->flexible_disk_page, sizeof (idefloppy_flexible_disk_page_t)))
		printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
				"%d sector size, %d rpm\n",
			drive->name, capacity / 1024, page->cyls,
			page->heads, page->sectors,
			page->transfer_rate / 8, page->sector_size, page->rpm);

	floppy->flexible_disk_page = *page;
	drive->bios_cyl = page->cyls;
	drive->bios_head = page->heads;
	drive->bios_sect = page->sectors;
	lba_capacity = floppy->blocks * floppy->block_size;
	if (capacity < lba_capacity) {
		printk(KERN_NOTICE "%s: The disk reports a capacity of %d "
			"bytes, but the drive only handles %d\n",
			drive->name, lba_capacity, capacity);
		floppy->blocks = floppy->block_size ? capacity / floppy->block_size : 0;
	}
	return 0;
}

static int idefloppy_get_capability_page(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t pc;
	idefloppy_mode_parameter_header_t *header;
	idefloppy_capabilities_page_t *page;

	floppy->srfp = 0;
	idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_CAPABILITIES_PAGE,
						 MODE_SENSE_CURRENT);

	set_bit(PC_SUPPRESS_ERROR, &pc.flags);
	if (idefloppy_queue_pc_tail(drive,&pc)) {
		return 1;
	}

	header = (idefloppy_mode_parameter_header_t *) pc.buffer;
	page= (idefloppy_capabilities_page_t *)(header+1);
	floppy->srfp = page->srfp;
	return (0);
}

/*
 *	Determine if a media is present in the floppy drive, and if so,
 *	its LBA capacity.
 */
static int idefloppy_get_capacity (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t pc;
	idefloppy_capacity_header_t *header;
	idefloppy_capacity_descriptor_t *descriptor;
	int i, descriptors, rc = 1, blocks, length;
	
	drive->bios_cyl = 0;
	drive->bios_head = drive->bios_sect = 0;
	floppy->blocks = 0;
	floppy->bs_factor = 1;
	set_capacity(floppy->disk, 0);

	idefloppy_create_read_capacity_cmd(&pc);
	if (idefloppy_queue_pc_tail(drive, &pc)) {
		printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
		return 1;
	}
	header = (idefloppy_capacity_header_t *) pc.buffer;
	descriptors = header->length / sizeof(idefloppy_capacity_descriptor_t);
	descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);

	for (i = 0; i < descriptors; i++, descriptor++) {
		blocks = descriptor->blocks = ntohl(descriptor->blocks);
		length = descriptor->length = ntohs(descriptor->length);

		if (!i) 
		{
		switch (descriptor->dc) {
		/* Clik! drive returns this instead of CAPACITY_CURRENT */
		case CAPACITY_UNFORMATTED:
			if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags))
                                /*
				 * If it is not a clik drive, break out
				 * (maintains previous driver behaviour)
				 */
				break;
		case CAPACITY_CURRENT:
			/* Normal Zip/LS-120 disks */
			if (memcmp(descriptor, &floppy->capacity, sizeof (idefloppy_capacity_descriptor_t)))
				printk(KERN_INFO "%s: %dkB, %d blocks, %d "
					"sector size\n", drive->name,
					blocks * length / 1024, blocks, length);
			floppy->capacity = *descriptor;
			if (!length || length % 512) {
				printk(KERN_NOTICE "%s: %d bytes block size "
					"not supported\n", drive->name, length);
			} else {
                                floppy->blocks = blocks;
                                floppy->block_size = length;
                                if ((floppy->bs_factor = length / 512) != 1)
                                        printk(KERN_NOTICE "%s: warning: non "
						"512 bytes block size not "
						"fully supported\n",
						drive->name);
                                rc = 0;
			}
			break;
		case CAPACITY_NO_CARTRIDGE:
			/*
			 * This is a KERN_ERR so it appears on screen
			 * for the user to see
			 */
			printk(KERN_ERR "%s: No disk in drive\n", drive->name);
			break;
		case CAPACITY_INVALID:
			printk(KERN_ERR "%s: Invalid capacity for disk "
				"in drive\n", drive->name);
			break;
		}
		}
		if (!i) {
			debug_log( "Descriptor 0 Code: %d\n",
				descriptor->dc);
		}
		debug_log( "Descriptor %d: %dkB, %d blocks, %d "
			"sector size\n", i, blocks * length / 1024, blocks,
			length);
	}

	/* Clik! disk does not support get_flexible_disk_page */
        if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
		(void) idefloppy_get_flexible_disk_page(drive);
	}

	set_capacity(floppy->disk, floppy->blocks * floppy->bs_factor);
	return rc;
}

/*
** Obtain the list of formattable capacities.
** Very similar to idefloppy_get_capacity, except that we push the capacity
** descriptors to userland, instead of our own structures.
**
** Userland gives us the following structure:
**
** struct idefloppy_format_capacities {
**        int nformats;
**        struct {
**                int nblocks;
**                int blocksize;
**                } formats[];
**        } ;
**
** userland initializes nformats to the number of allocated formats[]
** records.  On exit we set nformats to the number of records we've
** actually initialized.
**
*/

static int idefloppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
{
        idefloppy_pc_t pc;
	idefloppy_capacity_header_t *header;
        idefloppy_capacity_descriptor_t *descriptor;
	int i, descriptors, blocks, length;
	int u_array_size;
	int u_index;
	int __user *argp;

	if (get_user(u_array_size, arg))
		return (-EFAULT);

	if (u_array_size <= 0)
		return (-EINVAL);

	idefloppy_create_read_capacity_cmd(&pc);
	if (idefloppy_queue_pc_tail(drive, &pc)) {
		printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
                return (-EIO);
        }
        header = (idefloppy_capacity_header_t *) pc.buffer;
        descriptors = header->length /
		sizeof(idefloppy_capacity_descriptor_t);
	descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);

	u_index = 0;
	argp = arg + 1;

	/*
	** We always skip the first capacity descriptor.  That's the
	** current capacity.  We are interested in the remaining descriptors,
	** the formattable capacities.
	*/

	for (i=0; i<descriptors; i++, descriptor++) {
		if (u_index >= u_array_size)
			break;	/* User-supplied buffer too small */
		if (i == 0)
			continue;	/* Skip the first descriptor */

		blocks = ntohl(descriptor->blocks);
		length = ntohs(descriptor->length);

		if (put_user(blocks, argp))
			return(-EFAULT);
		++argp;

		if (put_user(length, argp))
			return (-EFAULT);
		++argp;

		++u_index;
	}

	if (put_user(u_index, arg))
		return (-EFAULT);
	return (0);
}

/*
** Send ATAPI_FORMAT_UNIT to the drive.
**
** Userland gives us the following structure:
**
** struct idefloppy_format_command {
**        int nblocks;
**        int blocksize;
**        int flags;
**        } ;
**
** flags is a bitmask, currently, the only defined flag is:
**
**        0x01 - verify media after format.
*/

static int idefloppy_begin_format(ide_drive_t *drive, int __user *arg)
{
	int blocks;
	int length;
	int flags;
	idefloppy_pc_t pc;

	if (get_user(blocks, arg) ||
	    get_user(length, arg+1) ||
	    get_user(flags, arg+2)) {
		return (-EFAULT);
	}

	/* Get the SFRP bit */
	(void) idefloppy_get_capability_page(drive);
	idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);
	if (idefloppy_queue_pc_tail(drive, &pc)) {
                return (-EIO);
	}

	return (0);
}

/*
** Get ATAPI_FORMAT_UNIT progress indication.
**
** Userland gives a pointer to an int.  The int is set to a progress
** indicator 0-65536, with 65536=100%.
**
** If the drive does not support format progress indication, we just check
** the dsc bit, and return either 0 or 65536.
*/

static int idefloppy_get_format_progress(ide_drive_t *drive, int __user *arg)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	idefloppy_pc_t pc;
	int progress_indication = 0x10000;

	if (floppy->srfp) {
		idefloppy_create_request_sense_cmd(&pc);
		if (idefloppy_queue_pc_tail(drive, &pc)) {
			return (-EIO);
		}

		if (floppy->sense_key == 2 &&
		    floppy->asc == 4 &&
		    floppy->ascq == 4) {
			progress_indication = floppy->progress_indication;
		}
		/* Else assume format_unit has finished, and we're
		** at 0x10000 */
	} else {
		atapi_status_t status;
		unsigned long flags;

		local_irq_save(flags);
		status.all = HWIF(drive)->INB(IDE_STATUS_REG);
		local_irq_restore(flags);

		progress_indication = !status.b.dsc ? 0 : 0x10000;
	}
	if (put_user(progress_indication, arg))
		return (-EFAULT);

	return (0);
}

/*
 *	Return the current floppy capacity.
 */
static sector_t idefloppy_capacity (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	unsigned long capacity = floppy->blocks * floppy->bs_factor;

	return capacity;
}

/*
 *	idefloppy_identify_device checks if we can support a drive,
 *	based on the ATAPI IDENTIFY command results.
 */
static int idefloppy_identify_device (ide_drive_t *drive,struct hd_driveid *id)
{
	struct idefloppy_id_gcw gcw;
#if IDEFLOPPY_DEBUG_INFO
	u16 mask,i;
	char buffer[80];
#endif /* IDEFLOPPY_DEBUG_INFO */

	*((u16 *) &gcw) = id->config;

#ifdef CONFIG_PPC
	/* kludge for Apple PowerBook internal zip */
	if ((gcw.device_type == 5) &&
	    !strstr(id->model, "CD-ROM") &&
	    strstr(id->model, "ZIP"))
		gcw.device_type = 0;			
#endif

#if IDEFLOPPY_DEBUG_INFO
	printk(KERN_INFO "Dumping ATAPI Identify Device floppy parameters\n");
	switch (gcw.protocol) {
		case 0: case 1: sprintf(buffer, "ATA");break;
		case 2:	sprintf(buffer, "ATAPI");break;
		case 3: sprintf(buffer, "Reserved (Unknown to ide-floppy)");break;
	}
	printk(KERN_INFO "Protocol Type: %s\n", buffer);
	switch (gcw.device_type) {
		case 0: sprintf(buffer, "Direct-access Device");break;
		case 1: sprintf(buffer, "Streaming Tape Device");break;
		case 2: case 3: case 4: sprintf (buffer, "Reserved");break;
		case 5: sprintf(buffer, "CD-ROM Device");break;
		case 6: sprintf(buffer, "Reserved");
		case 7: sprintf(buffer, "Optical memory Device");break;
		case 0x1f: sprintf(buffer, "Unknown or no Device type");break;
		default: sprintf(buffer, "Reserved");
	}
	printk(KERN_INFO "Device Type: %x - %s\n", gcw.device_type, buffer);
	printk(KERN_INFO "Removable: %s\n",gcw.removable ? "Yes":"No");	
	switch (gcw.drq_type) {
		case 0: sprintf(buffer, "Microprocessor DRQ");break;
		case 1: sprintf(buffer, "Interrupt DRQ");break;
		case 2: sprintf(buffer, "Accelerated DRQ");break;
		case 3: sprintf(buffer, "Reserved");break;
	}
	printk(KERN_INFO "Command Packet DRQ Type: %s\n", buffer);
	switch (gcw.packet_size) {
		case 0: sprintf(buffer, "12 bytes");break;
		case 1: sprintf(buffer, "16 bytes");break;
		default: sprintf(buffer, "Reserved");break;
	}
	printk(KERN_INFO "Command Packet Size: %s\n", buffer);
	printk(KERN_INFO "Model: %.40s\n",id->model);
	printk(KERN_INFO "Firmware Revision: %.8s\n",id->fw_rev);
	printk(KERN_INFO "Serial Number: %.20s\n",id->serial_no);
	printk(KERN_INFO "Write buffer size(?): %d bytes\n",id->buf_size*512);
	printk(KERN_INFO "DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
	printk(KERN_INFO "LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
	printk(KERN_INFO "IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
	printk(KERN_INFO "IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
	printk(KERN_INFO "ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
	printk(KERN_INFO "PIO Cycle Timing Category: %d\n",id->tPIO);
	printk(KERN_INFO "DMA Cycle Timing Category: %d\n",id->tDMA);
	printk(KERN_INFO "Single Word DMA supported modes:\n");
	for (i=0,mask=1;i<8;i++,mask=mask << 1) {
		if (id->dma_1word & mask)
			printk(KERN_INFO "   Mode %d%s\n", i,
			(id->dma_1word & (mask << 8)) ? " (active)" : "");
	}
	printk(KERN_INFO "Multi Word DMA supported modes:\n");
	for (i=0,mask=1;i<8;i++,mask=mask << 1) {
		if (id->dma_mword & mask)
			printk(KERN_INFO "   Mode %d%s\n", i,
			(id->dma_mword & (mask << 8)) ? " (active)" : "");
	}
	if (id->field_valid & 0x0002) {
		printk(KERN_INFO "Enhanced PIO Modes: %s\n",
			id->eide_pio_modes & 1 ? "Mode 3":"None");
		if (id->eide_dma_min == 0)
			sprintf(buffer, "Not supported");
		else
			sprintf(buffer, "%d ns",id->eide_dma_min);
		printk(KERN_INFO "Minimum Multi-word DMA cycle per word: %s\n", buffer);
		if (id->eide_dma_time == 0)
			sprintf(buffer, "Not supported");
		else
			sprintf(buffer, "%d ns",id->eide_dma_time);
		printk(KERN_INFO "Manufacturer\'s Recommended Multi-word cycle: %s\n", buffer);
		if (id->eide_pio == 0)
			sprintf(buffer, "Not supported");
		else
			sprintf(buffer, "%d ns",id->eide_pio);
		printk(KERN_INFO "Minimum PIO cycle without IORDY: %s\n",
			buffer);
		if (id->eide_pio_iordy == 0)
			sprintf(buffer, "Not supported");
		else
			sprintf(buffer, "%d ns",id->eide_pio_iordy);
		printk(KERN_INFO "Minimum PIO cycle with IORDY: %s\n", buffer);
	} else
		printk(KERN_INFO "According to the device, fields 64-70 are not valid.\n");
#endif /* IDEFLOPPY_DEBUG_INFO */

	if (gcw.protocol != 2)
		printk(KERN_ERR "ide-floppy: Protocol is not ATAPI\n");
	else if (gcw.device_type != 0)
		printk(KERN_ERR "ide-floppy: Device type is not set to floppy\n");
	else if (!gcw.removable)
		printk(KERN_ERR "ide-floppy: The removable flag is not set\n");
	else if (gcw.drq_type == 3) {
		printk(KERN_ERR "ide-floppy: Sorry, DRQ type %d not supported\n", gcw.drq_type);
	} else if (gcw.packet_size != 0) {
		printk(KERN_ERR "ide-floppy: Packet size is not 12 bytes long\n");
	} else
		return 1;
	return 0;
}

static void idefloppy_add_settings(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;

/*
 *			drive	setting name	read/write	ioctl	ioctl		data type	min	max	mul_factor	div_factor	data pointer		set function
 */
	ide_add_setting(drive,	"bios_cyl",		SETTING_RW,					-1,			-1,			TYPE_INT,	0,	1023,				1,	1,	&drive->bios_cyl,		NULL);
	ide_add_setting(drive,	"bios_head",		SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	255,				1,	1,	&drive->bios_head,		NULL);
	ide_add_setting(drive,	"bios_sect",		SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	63,				1,	1,	&drive->bios_sect,		NULL);
	ide_add_setting(drive,	"ticks",		SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	255,				1,	1,	&floppy->ticks,		NULL);
}

/*
 *	Driver initialization.
 */
static void idefloppy_setup (ide_drive_t *drive, idefloppy_floppy_t *floppy)
{
	struct idefloppy_id_gcw gcw;

	*((u16 *) &gcw) = drive->id->config;
	floppy->pc = floppy->pc_stack;
	if (gcw.drq_type == 1)
		set_bit(IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags);
	/*
	 *	We used to check revisions here. At this point however
	 *	I'm giving up. Just assume they are all broken, its easier.
	 *
	 *	The actual reason for the workarounds was likely
	 *	a driver bug after all rather than a firmware bug,
	 *	and the workaround below used to hide it. It should
	 *	be fixed as of version 1.9, but to be on the safe side
	 *	we'll leave the limitation below for the 2.2.x tree.
	 */

	if (!strncmp(drive->id->model, "IOMEGA ZIP 100 ATAPI", 20)) {
		set_bit(IDEFLOPPY_ZIP_DRIVE, &floppy->flags);
		/* This value will be visible in the /proc/ide/hdx/settings */
		floppy->ticks = IDEFLOPPY_TICKS_DELAY;
		blk_queue_max_sectors(drive->queue, 64);
	}

	/*
	*      Guess what?  The IOMEGA Clik! drive also needs the
	*      above fix.  It makes nasty clicking noises without
	*      it, so please don't remove this.
	*/
	if (strncmp(drive->id->model, "IOMEGA Clik!", 11) == 0) {
		blk_queue_max_sectors(drive->queue, 64);
		set_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags);
	}


	(void) idefloppy_get_capacity(drive);
	idefloppy_add_settings(drive);
}

static void ide_floppy_remove(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct gendisk *g = floppy->disk;

	ide_unregister_subdriver(drive, floppy->driver);

	del_gendisk(g);

	ide_floppy_put(floppy);
}

static void ide_floppy_release(struct kref *kref)
{
	struct ide_floppy_obj *floppy = to_ide_floppy(kref);
	ide_drive_t *drive = floppy->drive;
	struct gendisk *g = floppy->disk;

	drive->driver_data = NULL;
	g->private_data = NULL;
	put_disk(g);
	kfree(floppy);
}

#ifdef CONFIG_PROC_FS

static int proc_idefloppy_read_capacity
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_drive_t*drive = (ide_drive_t *)data;
	int len;

	len = sprintf(page,"%llu\n", (long long)idefloppy_capacity(drive));
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

static ide_proc_entry_t idefloppy_proc[] = {
	{ "capacity",	S_IFREG|S_IRUGO,	proc_idefloppy_read_capacity, NULL },
	{ "geometry",	S_IFREG|S_IRUGO,	proc_ide_read_geometry,	NULL },
	{ NULL, 0, NULL, NULL }
};

#else

#define	idefloppy_proc	NULL

#endif	/* CONFIG_PROC_FS */

static int ide_floppy_probe(ide_drive_t *);

static ide_driver_t idefloppy_driver = {
	.gen_driver = {
		.owner		= THIS_MODULE,
		.name		= "ide-floppy",
		.bus		= &ide_bus_type,
	},
	.probe			= ide_floppy_probe,
	.remove			= ide_floppy_remove,
	.version		= IDEFLOPPY_VERSION,
	.media			= ide_floppy,
	.supports_dsc_overlap	= 0,
	.do_request		= idefloppy_do_request,
	.end_request		= idefloppy_do_end_request,
	.error			= __ide_error,
	.abort			= __ide_abort,
	.proc			= idefloppy_proc,
};

static int idefloppy_open(struct inode *inode, struct file *filp)
{
	struct gendisk *disk = inode->i_bdev->bd_disk;
	struct ide_floppy_obj *floppy;
	ide_drive_t *drive;
	idefloppy_pc_t pc;
	int ret = 0;

	debug_log(KERN_INFO "Reached idefloppy_open\n");

	if (!(floppy = ide_floppy_get(disk)))
		return -ENXIO;

	drive = floppy->drive;

	floppy->openers++;

	if (floppy->openers == 1) {
		clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
		/* Just in case */

		idefloppy_create_test_unit_ready_cmd(&pc);
		if (idefloppy_queue_pc_tail(drive, &pc)) {
			idefloppy_create_start_stop_cmd(&pc, 1);
			(void) idefloppy_queue_pc_tail(drive, &pc);
		}

		if (idefloppy_get_capacity (drive)
		   && (filp->f_flags & O_NDELAY) == 0
		    /*
		    ** Allow O_NDELAY to open a drive without a disk, or with
		    ** an unreadable disk, so that we can get the format
		    ** capacity of the drive or begin the format - Sam
		    */
		    ) {
			ret = -EIO;
			goto out_put_floppy;
		}

		if (floppy->wp && (filp->f_mode & 2)) {
			ret = -EROFS;
			goto out_put_floppy;
		}
		set_bit(IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
		/* IOMEGA Clik! drives do not support lock/unlock commands */
                if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
			idefloppy_create_prevent_cmd(&pc, 1);
			(void) idefloppy_queue_pc_tail(drive, &pc);
		}
		check_disk_change(inode->i_bdev);
	} else if (test_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags)) {
		ret = -EBUSY;
		goto out_put_floppy;
	}
	return 0;

out_put_floppy:
	floppy->openers--;
	ide_floppy_put(floppy);
	return ret;
}

static int idefloppy_release(struct inode *inode, struct file *filp)
{
	struct gendisk *disk = inode->i_bdev->bd_disk;
	struct ide_floppy_obj *floppy = ide_floppy_g(disk);
	ide_drive_t *drive = floppy->drive;
	idefloppy_pc_t pc;
	
	debug_log(KERN_INFO "Reached idefloppy_release\n");

	if (floppy->openers == 1) {
		/* IOMEGA Clik! drives do not support lock/unlock commands */
                if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
			idefloppy_create_prevent_cmd(&pc, 0);
			(void) idefloppy_queue_pc_tail(drive, &pc);
		}

		clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
	}

	floppy->openers--;

	ide_floppy_put(floppy);

	return 0;
}

static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
	ide_drive_t *drive = floppy->drive;

	geo->heads = drive->bios_head;
	geo->sectors = drive->bios_sect;
	geo->cylinders = (u16)drive->bios_cyl; /* truncate */
	return 0;
}

static int idefloppy_ioctl(struct inode *inode, struct file *file,
			unsigned int cmd, unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
	ide_drive_t *drive = floppy->drive;
	void __user *argp = (void __user *)arg;
	int err;
	int prevent = (arg) ? 1 : 0;
	idefloppy_pc_t pc;

	switch (cmd) {
	case CDROMEJECT:
		prevent = 0;
		/* fall through */
	case CDROM_LOCKDOOR:
		if (floppy->openers > 1)
			return -EBUSY;

		/* The IOMEGA Clik! Drive doesn't support this command - no room for an eject mechanism */
                if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
			idefloppy_create_prevent_cmd(&pc, prevent);
			(void) idefloppy_queue_pc_tail(drive, &pc);
		}
		if (cmd == CDROMEJECT) {
			idefloppy_create_start_stop_cmd(&pc, 2);
			(void) idefloppy_queue_pc_tail(drive, &pc);
		}
		return 0;
	case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
		return 0;
	case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
		return idefloppy_get_format_capacities(drive, argp);
	case IDEFLOPPY_IOCTL_FORMAT_START:

		if (!(file->f_mode & 2))
			return -EPERM;

		if (floppy->openers > 1) {
			/* Don't format if someone is using the disk */

			clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS,
				  &floppy->flags);
			return -EBUSY;
		}

		set_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);

		err = idefloppy_begin_format(drive, argp);
		if (err)
			clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
		return err;
		/*
		** Note, the bit will be cleared when the device is
		** closed.  This is the cleanest way to handle the
		** situation where the drive does not support
		** format progress reporting.
		*/
	case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
		return idefloppy_get_format_progress(drive, argp);
	}
	return generic_ide_ioctl(drive, file, bdev, cmd, arg);
}

static int idefloppy_media_changed(struct gendisk *disk)
{
	struct ide_floppy_obj *floppy = ide_floppy_g(disk);
	ide_drive_t *drive = floppy->drive;

	/* do not scan partitions twice if this is a removable device */
	if (drive->attach) {
		drive->attach = 0;
		return 0;
	}
	return test_and_clear_bit(IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
}

static int idefloppy_revalidate_disk(struct gendisk *disk)
{
	struct ide_floppy_obj *floppy = ide_floppy_g(disk);
	set_capacity(disk, idefloppy_capacity(floppy->drive));
	return 0;
}

static struct block_device_operations idefloppy_ops = {
	.owner		= THIS_MODULE,
	.open		= idefloppy_open,
	.release	= idefloppy_release,
	.ioctl		= idefloppy_ioctl,
	.getgeo		= idefloppy_getgeo,
	.media_changed	= idefloppy_media_changed,
	.revalidate_disk= idefloppy_revalidate_disk
};

static int ide_floppy_probe(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy;
	struct gendisk *g;

	if (!strstr("ide-floppy", drive->driver_req))
		goto failed;
	if (!drive->present)
		goto failed;
	if (drive->media != ide_floppy)
		goto failed;
	if (!idefloppy_identify_device (drive, drive->id)) {
		printk (KERN_ERR "ide-floppy: %s: not supported by this version of ide-floppy\n", drive->name);
		goto failed;
	}
	if (drive->scsi) {
		printk("ide-floppy: passing drive %s to ide-scsi emulation.\n", drive->name);
		goto failed;
	}
	if ((floppy = kzalloc(sizeof (idefloppy_floppy_t), GFP_KERNEL)) == NULL) {
		printk (KERN_ERR "ide-floppy: %s: Can't allocate a floppy structure\n", drive->name);
		goto failed;
	}

	g = alloc_disk(1 << PARTN_BITS);
	if (!g)
		goto out_free_floppy;

	ide_init_disk(g, drive);

	ide_register_subdriver(drive, &idefloppy_driver);

	kref_init(&floppy->kref);

	floppy->drive = drive;
	floppy->driver = &idefloppy_driver;
	floppy->disk = g;

	g->private_data = &floppy->driver;

	drive->driver_data = floppy;

	idefloppy_setup (drive, floppy);

	g->minors = 1 << PARTN_BITS;
	g->driverfs_dev = &drive->gendev;
	g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
	g->fops = &idefloppy_ops;
	drive->attach = 1;
	add_disk(g);
	return 0;

out_free_floppy:
	kfree(floppy);
failed:
	return -ENODEV;
}

MODULE_DESCRIPTION("ATAPI FLOPPY Driver");

static void __exit idefloppy_exit (void)
{
	driver_unregister(&idefloppy_driver.gen_driver);
}

static int __init idefloppy_init(void)
{
	printk("ide-floppy driver " IDEFLOPPY_VERSION "\n");
	return driver_register(&idefloppy_driver.gen_driver);
}

MODULE_ALIAS("ide:*m-floppy*");
module_init(idefloppy_init);
module_exit(idefloppy_exit);
MODULE_LICENSE("GPL");