aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ide/ide-floppy.c
blob: 5f133dfb541c5e7fe4c406ef8e0775eb8a70598a (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
/*
 * IDE ATAPI floppy driver.
 *
 * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
 * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
 *
 * This driver supports the following IDE floppy drives:
 *
 * LS-120/240 SuperDisk
 * Iomega Zip 100/250
 * Iomega PC Card Clik!/PocketZip
 *
 * For a historical changelog see
 * Documentation/ide/ChangeLog.ide-floppy.1996-2002
 */

#define IDEFLOPPY_VERSION "1.00"

#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 <scsi/scsi_ioctl.h>

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

/* define to see debug info */
#define IDEFLOPPY_DEBUG_LOG		0

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

#if IDEFLOPPY_DEBUG_LOG
#define debug_log(fmt, args...) \
	printk(KERN_INFO "ide-floppy: " fmt, ## args)
#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)

/* format capacities descriptor codes */
#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 */
	struct ide_atapi_pc *pc;
	/* Last failed packet command */
	struct ide_atapi_pc *failed_pc;
	/* Packet command stack */
	struct ide_atapi_pc 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 descriptor */
	u8 cap_desc[8];
	/* Copy of the flexible disk page */
	u8 flexible_disk_page[32];
	/* 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. */
enum {
	/* DRQ interrupt device */
	IDEFLOPPY_FLAG_DRQ_INTERRUPT		= (1 <<	0),
	/* Media may have changed */
	IDEFLOPPY_FLAG_MEDIA_CHANGED		= (1 << 1),
	/* Format in progress */
	IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS	= (1 << 2),
	/* Avoid commands not supported in Clik drive */
	IDEFLOPPY_FLAG_CLIK_DRIVE		= (1 << 3),
	/* Requires BH algorithm for packets */
	IDEFLOPPY_FLAG_ZIP_DRIVE		= (1 << 4),
};

/* 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

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

/*
 * Pages of the SELECT SENSE / MODE SENSE packet commands.
 * See SFF-8070i spec.
 */
#define	IDEFLOPPY_CAPABILITIES_PAGE	0x1b
#define IDEFLOPPY_FLEXIBLE_DISK_PAGE	0x05

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 idefloppy_cleanup_obj(struct kref *);

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

/*
 * 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_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("Reached %s\n", __func__);

	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 ide_floppy_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
				  unsigned int bcount, int direction)
{
	struct request *rq = pc->rq;
	struct req_iterator iter;
	struct bio_vec *bvec;
	unsigned long flags;
	int count, done = 0;
	char *data;

	rq_for_each_segment(bvec, rq, iter) {
		if (!bcount)
			break;

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

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

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

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

	if (bcount) {
		printk(KERN_ERR "%s: leftover data in %s, bcount == %d\n",
				drive->name, __func__, bcount);
		if (direction)
			ide_atapi_write_zeros(drive, bcount);
		else
			ide_atapi_discard_data(drive, bcount);
	}
}

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

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

/*
 * Generate 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, struct ide_atapi_pc *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 struct ide_atapi_pc *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++]);
}

static void idefloppy_request_sense_callback(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	u8 *buf = floppy->pc->buf;

	debug_log("Reached %s\n", __func__);

	if (!floppy->pc->error) {
		floppy->sense_key = buf[2] & 0x0F;
		floppy->asc = buf[12];
		floppy->ascq = buf[13];
		floppy->progress_indication = buf[15] & 0x80 ?
			(u16)get_unaligned((u16 *)&buf[16]) : 0x10000;

		if (floppy->failed_pc)
			debug_log("pc = %x, sense key = %x, asc = %x,"
					" ascq = %x\n",
					floppy->failed_pc->c[0],
					floppy->sense_key,
					floppy->asc,
					floppy->ascq);
		else
			debug_log("sense key = %x, asc = %x, ascq = %x\n",
					floppy->sense_key,
					floppy->asc,
					floppy->ascq);


		idefloppy_end_request(drive, 1, 0);
	} else {
		printk(KERN_ERR "Error in REQUEST SENSE itself - Aborting"
				" request!\n");
		idefloppy_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("Reached %s\n", __func__);

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

static void idefloppy_init_pc(struct ide_atapi_pc *pc)
{
	memset(pc->c, 0, 12);
	pc->retries = 0;
	pc->flags = 0;
	pc->req_xfer = 0;
	pc->buf = pc->pc_buf;
	pc->buf_size = IDEFLOPPY_PC_BUFFER_SIZE;
	pc->idefloppy_callback = &idefloppy_pc_callback;
}

static void idefloppy_create_request_sense_cmd(struct ide_atapi_pc *pc)
{
	idefloppy_init_pc(pc);
	pc->c[0] = GPCMD_REQUEST_SENSE;
	pc->c[4] = 255;
	pc->req_xfer = 18;
	pc->idefloppy_callback = &idefloppy_request_sense_callback;
}

/*
 * 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)
{
	struct ide_atapi_pc *pc;
	struct request *rq;

	(void)ide_read_error(drive);
	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);
}

/* The usual interrupt handler called during a packet command. */
static ide_startstop_t idefloppy_pc_intr (ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	ide_hwif_t *hwif = drive->hwif;
	struct ide_atapi_pc *pc = floppy->pc;
	struct request *rq = pc->rq;
	xfer_func_t *xferfunc;
	unsigned int temp;
	int dma_error = 0;
	u16 bcount;
	u8 stat, ireason;

	debug_log("Reached %s interrupt handler\n", __func__);

	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
		dma_error = hwif->ide_dma_end(drive);
		if (dma_error) {
			printk(KERN_ERR "%s: DMA %s error\n", drive->name,
					rq_data_dir(rq) ? "write" : "read");
			pc->flags |= PC_FLAG_DMA_ERROR;
		} else {
			pc->xferred = pc->req_xfer;
			idefloppy_update_buffers(drive, pc);
		}
		debug_log("DMA finished\n");
	}

	/* Clear the interrupt */
	stat = ide_read_status(drive);

	/* No more interrupts */
	if ((stat & DRQ_STAT) == 0) {
		debug_log("Packet command completed, %d bytes transferred\n",
				pc->xferred);
		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;

		local_irq_enable_in_hardirq();

		if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
			/* Error detected */
			debug_log("%s: I/O error\n", drive->name);
			rq->errors++;
			if (pc->c[0] == GPCMD_REQUEST_SENSE) {
				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->idefloppy_callback(drive);
		return ide_stopped;
	}

	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
		printk(KERN_ERR "ide-floppy: The floppy wants to issue "
			"more interrupts in DMA mode\n");
		ide_dma_off(drive);
		return ide_do_reset(drive);
	}

	/* Get the number of bytes to transfer */
	bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
		  hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
	/* on this interrupt */
	ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);

	if (ireason & CD) {
		printk(KERN_ERR "ide-floppy: CoD != 0 in %s\n", __func__);
		return ide_do_reset(drive);
	}
	if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
		/* Hopefully, we will never get here */
		printk(KERN_ERR "ide-floppy: We wanted to %s, ",
				(ireason & IO) ? "Write" : "Read");
		printk(KERN_ERR "but the floppy wants us to %s !\n",
				(ireason & IO) ? "Read" : "Write");
		return ide_do_reset(drive);
	}
	if (!(pc->flags & PC_FLAG_WRITING)) {
		/* Reading - Check that we have enough space */
		temp = pc->xferred + bcount;
		if (temp > pc->req_xfer) {
			if (temp > pc->buf_size) {
				printk(KERN_ERR "ide-floppy: The floppy wants "
					"to send us more data than expected "
					"- discarding data\n");
				ide_atapi_discard_data(drive, bcount);

				ide_set_handler(drive,
						&idefloppy_pc_intr,
						IDEFLOPPY_WAIT_CMD,
						NULL);
				return ide_started;
			}
			debug_log("The floppy wants to send us more data than"
					" expected - allowing transfer\n");
		}
	}
	if (pc->flags & PC_FLAG_WRITING)
		xferfunc = hwif->atapi_output_bytes;
	else
		xferfunc = hwif->atapi_input_bytes;

	if (pc->buf)
		xferfunc(drive, pc->cur_pos, bcount);
	else
		ide_floppy_io_buffers(drive, pc, bcount,
				      !!(pc->flags & PC_FLAG_WRITING));

	/* Update the current position */
	pc->xferred += bcount;
	pc->cur_pos += bcount;

	/* And set the interrupt handler again */
	ide_set_handler(drive, &idefloppy_pc_intr, IDEFLOPPY_WAIT_CMD, NULL);
	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_hwif_t *hwif = drive->hwif;
	ide_startstop_t startstop;
	idefloppy_floppy_t *floppy = drive->driver_data;
	u8 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 = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
	if ((ireason & CD) == 0 || (ireason & IO)) {
		printk(KERN_ERR "ide-floppy: (IO,CoD) != (0,1) while "
				"issuing a packet command\n");
		return ide_do_reset(drive);
	}

	/* 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
 * that it is 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)
{
	ide_hwif_t *hwif = drive->hwif;
	idefloppy_floppy_t *floppy = drive->driver_data;
	ide_startstop_t startstop;
	u8 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 = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
	if ((ireason & CD) == 0 || (ireason & 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.
	 */

	ide_set_handler(drive, &idefloppy_pc_intr, floppy->ticks,
			&idefloppy_transfer_pc2);
	return ide_started;
}

static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
				    struct ide_atapi_pc *pc)
{
	/* supress error messages resulting from Medium not present */
	if (floppy->sense_key == 0x02 &&
	    floppy->asc       == 0x3a &&
	    floppy->ascq      == 0x00)
		return;

	printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, "
			"asc = %2x, ascq = %2x\n",
			floppy->drive->name, pc->c[0], floppy->sense_key,
			floppy->asc, floppy->ascq);

}

static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
		struct ide_atapi_pc *pc)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	ide_hwif_t *hwif = drive->hwif;
	ide_handler_t *pkt_xfer_routine;
	u16 bcount;
	u8 dma;

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

	if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
		if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
			ide_floppy_report_error(floppy, pc);
		/* Giving up */
		pc->error = IDEFLOPPY_ERROR_GENERAL;

		floppy->failed_pc = NULL;
		pc->idefloppy_callback(drive);
		return ide_stopped;
	}

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

	pc->retries++;
	/* We haven't transferred any data yet */
	pc->xferred = 0;
	pc->cur_pos = pc->buf;
	bcount = min(pc->req_xfer, 63 * 1024);

	if (pc->flags & PC_FLAG_DMA_ERROR) {
		pc->flags &= ~PC_FLAG_DMA_ERROR;
		ide_dma_off(drive);
	}
	dma = 0;

	if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma)
		dma = !hwif->dma_setup(drive);

	ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
			   IDE_TFLAG_OUT_DEVICE, bcount, dma);

	if (dma) {
		/* Begin DMA, if necessary */
		pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
		hwif->dma_start(drive);
	}

	/* Can we transfer the packet when we get the interrupt or wait? */
	if (floppy->flags & IDEFLOPPY_FLAG_ZIP_DRIVE) {
		/* wait */
		pkt_xfer_routine = &idefloppy_transfer_pc1;
	} else {
		/* immediate */
		pkt_xfer_routine = &idefloppy_transfer_pc;
	}

	if (floppy->flags & IDEFLOPPY_FLAG_DRQ_INTERRUPT) {
		/* 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->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
		return (*pkt_xfer_routine) (drive);
	}
}

static void idefloppy_rw_callback(ide_drive_t *drive)
{
	debug_log("Reached %s\n", __func__);

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

static void idefloppy_create_prevent_cmd(struct ide_atapi_pc *pc, int prevent)
{
	debug_log("creating prevent removal command, prevent = %d\n", prevent);

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

static void idefloppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
{
	idefloppy_init_pc(pc);
	pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
	pc->c[7] = 255;
	pc->c[8] = 255;
	pc->req_xfer = 255;
}

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

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

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

	put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
	put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
	pc->buf_size = 12;
	pc->flags |= PC_FLAG_WRITING;
}

/* A mode sense command is used to "sense" floppy parameters. */
static void idefloppy_create_mode_sense_cmd(struct ide_atapi_pc *pc,
		u8 page_code, u8 type)
{
	u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */

	idefloppy_init_pc(pc);
	pc->c[0] = GPCMD_MODE_SENSE_10;
	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(cpu_to_be16(length), (u16 *) &pc->c[7]);
	pc->req_xfer = length;
}

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

static void idefloppy_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
{
	idefloppy_init_pc(pc);
	pc->c[0] = GPCMD_TEST_UNIT_READY;
}

static void idefloppy_create_rw_cmd(idefloppy_floppy_t *floppy,
				    struct ide_atapi_pc *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_rw10_cmd: block == %d, blocks == %d\n",
		block, blocks);

	idefloppy_init_pc(pc);
	pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
	put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
	put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);

	pc->idefloppy_callback = &idefloppy_rw_callback;
	pc->rq = rq;
	pc->b_count = cmd == READ ? 0 : rq->bio->bi_size;
	if (rq->cmd_flags & REQ_RW)
		pc->flags |= PC_FLAG_WRITING;
	pc->buf = NULL;
	pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
	pc->flags |= PC_FLAG_DMA_RECOMMENDED;
}

static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
		struct ide_atapi_pc *pc, struct request *rq)
{
	idefloppy_init_pc(pc);
	pc->idefloppy_callback = &idefloppy_rw_callback;
	memcpy(pc->c, rq->cmd, sizeof(pc->c));
	pc->rq = rq;
	pc->b_count = rq->data_len;
	if (rq->data_len && rq_data_dir(rq) == WRITE)
		pc->flags |= PC_FLAG_WRITING;
	pc->buf = rq->data;
	if (rq->bio)
		pc->flags |= PC_FLAG_DMA_RECOMMENDED;
	/*
	 * possibly problematic, doesn't look like ide-floppy correctly
	 * handled scattered requests if dma fails...
	 */
	pc->req_xfer = pc->buf_size = rq->data_len;
}

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;
	struct ide_atapi_pc *pc;
	unsigned long block = (unsigned long)block_s;

	debug_log("dev: %s, cmd_type: %x, errors: %d\n",
			rq->rq_disk ? rq->rq_disk->disk_name : "?",
			rq->cmd_type, rq->errors);
	debug_log("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)
			ide_floppy_report_error(floppy, floppy->failed_pc);
		else
			printk(KERN_ERR "ide-floppy: %s: I/O error\n",
				drive->name);
		idefloppy_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(KERN_ERR "%s: unsupported r/w request size\n",
					drive->name);
			idefloppy_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 = (struct ide_atapi_pc *) rq->buffer;
	} else if (blk_pc_request(rq)) {
		pc = idefloppy_next_pc_storage(drive);
		idefloppy_blockpc_cmd(floppy, pc, rq);
	} else {
		blk_dump_rq_flags(rq,
			"ide-floppy: unsupported command in queue");
		idefloppy_end_request(drive, 0, 0);
		return ide_stopped;
	}

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

/*
 * Add a special packet command request to the tail of the request queue,
 * and wait for it to be serviced.
 */
static int idefloppy_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *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 ignore the CHS capacity
 * parameters and use the LBA parameters instead.
 */
static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct ide_atapi_pc pc;
	u8 *page;
	int capacity, lba_capacity;
	u16 transfer_rate, sector_size, cyls, rpm;
	u8 heads, sectors;

	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;
	}
	floppy->wp = !!(pc.buf[3] & 0x80);
	set_disk_ro(floppy->disk, floppy->wp);
	page = &pc.buf[8];

	transfer_rate = be16_to_cpu(*(u16 *)&pc.buf[8 + 2]);
	sector_size   = be16_to_cpu(*(u16 *)&pc.buf[8 + 6]);
	cyls          = be16_to_cpu(*(u16 *)&pc.buf[8 + 8]);
	rpm           = be16_to_cpu(*(u16 *)&pc.buf[8 + 28]);
	heads         = pc.buf[8 + 4];
	sectors       = pc.buf[8 + 5];

	capacity = cyls * heads * sectors * sector_size;

	if (memcmp(page, &floppy->flexible_disk_page, 32))
		printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
				"%d sector size, %d rpm\n",
				drive->name, capacity / 1024, cyls, heads,
				sectors, transfer_rate / 8, sector_size, rpm);

	memcpy(&floppy->flexible_disk_page, page, 32);
	drive->bios_cyl = cyls;
	drive->bios_head = heads;
	drive->bios_sect = 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_sfrp_bit(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct ide_atapi_pc pc;

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

	pc.flags |= PC_FLAG_SUPPRESS_ERROR;
	if (idefloppy_queue_pc_tail(drive, &pc))
		return 1;

	floppy->srfp = pc.buf[8 + 2] & 0x40;
	return (0);
}

/*
 * Determine if a media is present in the floppy drive, and if so, its LBA
 * capacity.
 */
static int ide_floppy_get_capacity(ide_drive_t *drive)
{
	idefloppy_floppy_t *floppy = drive->driver_data;
	struct ide_atapi_pc pc;
	u8 *cap_desc;
	u8 header_len, desc_cnt;
	int i, 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_len = pc.buf[3];
	cap_desc = &pc.buf[4];
	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

	for (i = 0; i < desc_cnt; i++) {
		unsigned int desc_start = 4 + i*8;

		blocks = be32_to_cpu(*(u32 *)&pc.buf[desc_start]);
		length = be16_to_cpu(*(u16 *)&pc.buf[desc_start + 6]);

		debug_log("Descriptor %d: %dkB, %d blocks, %d sector size\n",
				i, blocks * length / 1024, blocks, length);

		if (i)
			continue;
		/*
		 * the code below is valid only for the 1st descriptor, ie i=0
		 */

		switch (pc.buf[desc_start + 4] & 0x03) {
		/* Clik! drive returns this instead of CAPACITY_CURRENT */
		case CAPACITY_UNFORMATTED:
			if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE))
				/*
				 * If it is not a clik drive, break out
				 * (maintains previous driver behaviour)
				 */
				break;
		case CAPACITY_CURRENT:
			/* Normal Zip/LS-120 disks */
			if (memcmp(cap_desc, &floppy->cap_desc, 8))
				printk(KERN_INFO "%s: %dkB, %d blocks, %d "
					"sector size\n", drive->name,
					blocks * length / 1024, blocks, length);
			memcpy(&floppy->cap_desc, cap_desc, 8);

			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;
				floppy->bs_factor = length / 512;
				if (floppy->bs_factor != 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;
		}
		debug_log("Descriptor 0 Code: %d\n",
			  pc.buf[desc_start + 4] & 0x03);
	}

	/* Clik! disk does not support get_flexible_disk_page */
	if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE))
		(void) ide_floppy_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 ide_floppy_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 ide_floppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
{
	struct ide_atapi_pc pc;
	u8 header_len, desc_cnt;
	int i, blocks, length, u_array_size, 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_len = pc.buf[3];
	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

	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 = 1; i < desc_cnt; i++) {
		unsigned int desc_start = 4 + i*8;

		if (u_index >= u_array_size)
			break;	/* User-supplied buffer too small */

		blocks = be32_to_cpu(*(u32 *)&pc.buf[desc_start]);
		length = be16_to_cpu(*(u16 *)&pc.buf[desc_start + 6]);

		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);
}

/*
 * 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;
	struct ide_atapi_pc 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 {
		unsigned long flags;
		u8 stat;

		local_irq_save(flags);
		stat = ide_read_status(drive);
		local_irq_restore(flags);

		progress_indication = ((stat & SEEK_STAT) == 0) ? 0 : 0x10000;
	}
	if (put_user(progress_indication, arg))
		return (-EFAULT);

	return (0);
}

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;
}

/*
 * Check whether 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)
{
	u8 gcw[2];
	u8 device_type, protocol, removable, drq_type, packet_size;

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

	device_type =  gcw[1] & 0x1F;
	removable   = (gcw[0] & 0x80) >> 7;
	protocol    = (gcw[1] & 0xC0) >> 6;
	drq_type    = (gcw[0] & 0x60) >> 5;
	packet_size =  gcw[0] & 0x03;

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

	if (protocol != 2)
		printk(KERN_ERR "ide-floppy: Protocol (0x%02x) is not ATAPI\n",
			protocol);
	else if (device_type != 0)
		printk(KERN_ERR "ide-floppy: Device type (0x%02x) is not set "
				"to floppy\n", device_type);
	else if (!removable)
		printk(KERN_ERR "ide-floppy: The removable flag is not set\n");
	else if (drq_type == 3)
		printk(KERN_ERR "ide-floppy: Sorry, DRQ type (0x%02x) not "
				"supported\n", drq_type);
	else if (packet_size != 0)
		printk(KERN_ERR "ide-floppy: Packet size (0x%02x) is not 12 "
				"bytes\n", packet_size);
	else
		return 1;
	return 0;
}

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

	ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1,
			&drive->bios_cyl, NULL);
	ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
			&drive->bios_head, NULL);
	ide_add_setting(drive, "bios_sect", SETTING_RW,	TYPE_BYTE, 0,  63, 1, 1,
			&drive->bios_sect, NULL);
	ide_add_setting(drive, "ticks",	   SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
			&floppy->ticks,	 NULL);
}
#else
static inline void idefloppy_add_settings(ide_drive_t *drive) { ; }
#endif

static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
{
	u8 gcw[2];

	*((u16 *) &gcw) = drive->id->config;
	floppy->pc = floppy->pc_stack;

	if (((gcw[0] & 0x60) >> 5) == 1)
		floppy->flags |= IDEFLOPPY_FLAG_DRQ_INTERRUPT;
	/*
	 * 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)) {
		floppy->flags |= IDEFLOPPY_FLAG_ZIP_DRIVE;
		/* 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);
		floppy->flags |= IDEFLOPPY_FLAG_CLIK_DRIVE;
	}

	(void) ide_floppy_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_proc_unregister_driver(drive, floppy->driver);

	del_gendisk(g);

	ide_floppy_put(floppy);
}

static void idefloppy_cleanup_obj(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_IDE_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 }
};
#endif	/* CONFIG_IDE_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_end_request,
	.error			= __ide_error,
	.abort			= __ide_abort,
#ifdef CONFIG_IDE_PROC_FS
	.proc			= idefloppy_proc,
#endif
};

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;
	struct ide_atapi_pc pc;
	int ret = 0;

	debug_log("Reached %s\n", __func__);

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

	drive = floppy->drive;

	floppy->openers++;

	if (floppy->openers == 1) {
		floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
		/* 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 (ide_floppy_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;
		}
		floppy->flags |= IDEFLOPPY_FLAG_MEDIA_CHANGED;
		/* IOMEGA Clik! drives do not support lock/unlock commands */
		if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
			idefloppy_create_prevent_cmd(&pc, 1);
			(void) idefloppy_queue_pc_tail(drive, &pc);
		}
		check_disk_change(inode->i_bdev);
	} else if (floppy->flags & IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS) {
		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;
	struct ide_atapi_pc pc;

	debug_log("Reached %s\n", __func__);

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

		floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
	}

	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 ide_floppy_lockdoor(idefloppy_floppy_t *floppy,
		struct ide_atapi_pc *pc, unsigned long arg, unsigned int cmd)
{
	if (floppy->openers > 1)
		return -EBUSY;

	/* The IOMEGA Clik! Drive doesn't support this command -
	 * no room for an eject mechanism */
	if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
		int prevent = arg ? 1 : 0;

		if (cmd == CDROMEJECT)
			prevent = 0;

		idefloppy_create_prevent_cmd(pc, prevent);
		(void) idefloppy_queue_pc_tail(floppy->drive, pc);
	}

	if (cmd == CDROMEJECT) {
		idefloppy_create_start_stop_cmd(pc, 2);
		(void) idefloppy_queue_pc_tail(floppy->drive, pc);
	}

	return 0;
}

static int ide_floppy_format_unit(idefloppy_floppy_t *floppy,
				  int __user *arg)
{
	int blocks, length, flags, err = 0;
	struct ide_atapi_pc pc;

	if (floppy->openers > 1) {
		/* Don't format if someone is using the disk */
		floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
		return -EBUSY;
	}

	floppy->flags |= IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;

	/*
	 * 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.
	 */
	if (get_user(blocks, arg) ||
			get_user(length, arg+1) ||
			get_user(flags, arg+2)) {
		err = -EFAULT;
		goto out;
	}

	(void) idefloppy_get_sfrp_bit(floppy->drive);
	idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);

	if (idefloppy_queue_pc_tail(floppy->drive, &pc))
		err = -EIO;

out:
	if (err)
		floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
	return err;
}


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;
	struct ide_atapi_pc pc;
	void __user *argp = (void __user *)arg;
	int err;

	switch (cmd) {
	case CDROMEJECT:
		/* fall through */
	case CDROM_LOCKDOOR:
		return ide_floppy_lockdoor(floppy, &pc, arg, cmd);
	case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
		return 0;
	case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
		return ide_floppy_get_format_capacities(drive, argp);
	case IDEFLOPPY_IOCTL_FORMAT_START:
		if (!(file->f_mode & 2))
			return -EPERM;

		return ide_floppy_format_unit(floppy, (int __user *)arg);
	case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
		return idefloppy_get_format_progress(drive, argp);
	}

	/*
	 * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
	 * and CDROM_SEND_PACKET (legacy) ioctls
	 */
	if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
		err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
					bdev->bd_disk, cmd, argp);
	else
		err = -ENOTTY;

	if (err == -ENOTTY)
		err = generic_ide_ioctl(drive, file, bdev, cmd, arg);

	return err;
}

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

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

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(KERN_INFO "ide-floppy: passing drive %s to ide-scsi"
				" emulation.\n", drive->name);
		goto failed;
	}
	floppy = kzalloc(sizeof(idefloppy_floppy_t), GFP_KERNEL);
	if (!floppy) {
		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_proc_register_driver(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;
}

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");
MODULE_DESCRIPTION("ATAPI FLOPPY Driver");