summaryrefslogtreecommitdiffstats
path: root/include/linux/ide.h
blob: 6c39482fd1a10e7eb4a7a74c17c3e29a000bfd66 (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
#ifndef _IDE_H
#define _IDE_H
/*
 *  linux/include/linux/ide.h
 *
 *  Copyright (C) 1994-2002  Linus Torvalds & authors
 */

#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/bio.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/completion.h>
#ifdef CONFIG_BLK_DEV_IDEACPI
#include <acpi/acpi.h>
#endif
#include <asm/byteorder.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/semaphore.h>
#include <asm/mutex.h>

#if defined(CONFIG_CRIS) || defined(CONFIG_FRV)
# define SUPPORT_VLB_SYNC 0
#else
# define SUPPORT_VLB_SYNC 1
#endif

/*
 * Used to indicate "no IRQ", should be a value that cannot be an IRQ
 * number.
 */
 
#define IDE_NO_IRQ		(-1)

typedef unsigned char	byte;	/* used everywhere */

/*
 * Probably not wise to fiddle with these
 */
#define ERROR_MAX	8	/* Max read/write errors per sector */
#define ERROR_RESET	3	/* Reset controller every 4th retry */
#define ERROR_RECAL	1	/* Recalibrate every 2nd retry */

/*
 * Tune flags
 */
#define IDE_TUNE_NOAUTO		2
#define IDE_TUNE_AUTO		1
#define IDE_TUNE_DEFAULT	0

/*
 * state flags
 */

#define DMA_PIO_RETRY	1	/* retrying in PIO */

#define HWIF(drive)		((ide_hwif_t *)((drive)->hwif))
#define HWGROUP(drive)		((ide_hwgroup_t *)(HWIF(drive)->hwgroup))

/*
 * Definitions for accessing IDE controller registers
 */
#define IDE_NR_PORTS		(10)

#define IDE_DATA_OFFSET		(0)
#define IDE_ERROR_OFFSET	(1)
#define IDE_NSECTOR_OFFSET	(2)
#define IDE_SECTOR_OFFSET	(3)
#define IDE_LCYL_OFFSET		(4)
#define IDE_HCYL_OFFSET		(5)
#define IDE_SELECT_OFFSET	(6)
#define IDE_STATUS_OFFSET	(7)
#define IDE_CONTROL_OFFSET	(8)
#define IDE_IRQ_OFFSET		(9)

#define IDE_FEATURE_OFFSET	IDE_ERROR_OFFSET
#define IDE_COMMAND_OFFSET	IDE_STATUS_OFFSET
#define IDE_ALTSTATUS_OFFSET	IDE_CONTROL_OFFSET
#define IDE_IREASON_OFFSET	IDE_NSECTOR_OFFSET
#define IDE_BCOUNTL_OFFSET	IDE_LCYL_OFFSET
#define IDE_BCOUNTH_OFFSET	IDE_HCYL_OFFSET

#define OK_STAT(stat,good,bad)	(((stat)&((good)|(bad)))==(good))
#define BAD_R_STAT		(BUSY_STAT   | ERR_STAT)
#define BAD_W_STAT		(BAD_R_STAT  | WRERR_STAT)
#define BAD_STAT		(BAD_R_STAT  | DRQ_STAT)
#define DRIVE_READY		(READY_STAT  | SEEK_STAT)

#define BAD_CRC			(ABRT_ERR    | ICRC_ERR)

#define SATA_NR_PORTS		(3)	/* 16 possible ?? */

#define SATA_STATUS_OFFSET	(0)
#define SATA_ERROR_OFFSET	(1)
#define SATA_CONTROL_OFFSET	(2)

/*
 * Our Physical Region Descriptor (PRD) table should be large enough
 * to handle the biggest I/O request we are likely to see.  Since requests
 * can have no more than 256 sectors, and since the typical blocksize is
 * two or more sectors, we could get by with a limit of 128 entries here for
 * the usual worst case.  Most requests seem to include some contiguous blocks,
 * further reducing the number of table entries required.
 *
 * The driver reverts to PIO mode for individual requests that exceed
 * this limit (possible with 512 byte blocksizes, eg. MSDOS f/s), so handling
 * 100% of all crazy scenarios here is not necessary.
 *
 * As it turns out though, we must allocate a full 4KB page for this,
 * so the two PRD tables (ide0 & ide1) will each get half of that,
 * allowing each to have about 256 entries (8 bytes each) from this.
 */
#define PRD_BYTES       8
#define PRD_ENTRIES	256

/*
 * Some more useful definitions
 */
#define PARTN_BITS	6	/* number of minor dev bits for partitions */
#define MAX_DRIVES	2	/* per interface; 2 assumed by lots of code */
#define SECTOR_SIZE	512
#define SECTOR_WORDS	(SECTOR_SIZE / 4)	/* number of 32bit words per sector */
#define IDE_LARGE_SEEK(b1,b2,t)	(((b1) > (b2) + (t)) || ((b2) > (b1) + (t)))

/*
 * Timeouts for various operations:
 */
#define WAIT_DRQ	(HZ/10)		/* 100msec - spec allows up to 20ms */
#define WAIT_READY	(5*HZ)		/* 5sec - some laptops are very slow */
#define WAIT_PIDENTIFY	(10*HZ)	/* 10sec  - should be less than 3ms (?), if all ATAPI CD is closed at boot */
#define WAIT_WORSTCASE	(30*HZ)	/* 30sec  - worst case when spinning up */
#define WAIT_CMD	(10*HZ)	/* 10sec  - maximum wait for an IRQ to happen */
#define WAIT_MIN_SLEEP	(2*HZ/100)	/* 20msec - minimum sleep time */

/*
 * Check for an interrupt and acknowledge the interrupt status
 */
struct hwif_s;
typedef int (ide_ack_intr_t)(struct hwif_s *);

/*
 * hwif_chipset_t is used to keep track of the specific hardware
 * chipset used by each IDE interface, if known.
 */
enum {		ide_unknown,	ide_generic,	ide_pci,
		ide_cmd640,	ide_dtc2278,	ide_ali14xx,
		ide_qd65xx,	ide_umc8672,	ide_ht6560b,
		ide_rz1000,	ide_trm290,
		ide_cmd646,	ide_cy82c693,	ide_4drives,
		ide_pmac,	ide_etrax100,	ide_acorn,
		ide_au1xxx,	ide_palm3710
};

typedef u8 hwif_chipset_t;

/*
 * Structure to hold all information about the location of this port
 */
typedef struct hw_regs_s {
	unsigned long	io_ports[IDE_NR_PORTS];	/* task file registers */
	int		irq;			/* our irq number */
	ide_ack_intr_t	*ack_intr;		/* acknowledge interrupt */
	hwif_chipset_t  chipset;
	struct device	*dev;
} hw_regs_t;

struct hwif_s * ide_find_port(unsigned long);
void ide_init_port_data(struct hwif_s *, unsigned int);
void ide_init_port_hw(struct hwif_s *, hw_regs_t *);

static inline void ide_std_init_ports(hw_regs_t *hw,
				      unsigned long io_addr,
				      unsigned long ctl_addr)
{
	unsigned int i;

	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
		hw->io_ports[i] = io_addr++;

	hw->io_ports[IDE_CONTROL_OFFSET] = ctl_addr;
}

#include <asm/ide.h>

#if !defined(MAX_HWIFS) || defined(CONFIG_EMBEDDED)
#undef MAX_HWIFS
#define MAX_HWIFS	CONFIG_IDE_MAX_HWIFS
#endif

/* Currently only m68k, apus and m8xx need it */
#ifndef IDE_ARCH_ACK_INTR
# define ide_ack_intr(hwif) (1)
#endif

/* Currently only Atari needs it */
#ifndef IDE_ARCH_LOCK
# define ide_release_lock()			do {} while (0)
# define ide_get_lock(hdlr, data)		do {} while (0)
#endif /* IDE_ARCH_LOCK */

/*
 * Now for the data we need to maintain per-drive:  ide_drive_t
 */

#define ide_scsi	0x21
#define ide_disk	0x20
#define ide_optical	0x7
#define ide_cdrom	0x5
#define ide_tape	0x1
#define ide_floppy	0x0

/*
 * Special Driver Flags
 *
 * set_geometry	: respecify drive geometry
 * recalibrate	: seek to cyl 0
 * set_multmode	: set multmode count
 * set_tune	: tune interface for drive
 * serviced	: service command
 * reserved	: unused
 */
typedef union {
	unsigned all			: 8;
	struct {
		unsigned set_geometry	: 1;
		unsigned recalibrate	: 1;
		unsigned set_multmode	: 1;
		unsigned set_tune	: 1;
		unsigned serviced	: 1;
		unsigned reserved	: 3;
	} b;
} special_t;

/*
 * ATA-IDE Select Register, aka Device-Head
 *
 * head		: always zeros here
 * unit		: drive select number: 0/1
 * bit5		: always 1
 * lba		: using LBA instead of CHS
 * bit7		: always 1
 */
typedef union {
	unsigned all			: 8;
	struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
		unsigned head		: 4;
		unsigned unit		: 1;
		unsigned bit5		: 1;
		unsigned lba		: 1;
		unsigned bit7		: 1;
#elif defined(__BIG_ENDIAN_BITFIELD)
		unsigned bit7		: 1;
		unsigned lba		: 1;
		unsigned bit5		: 1;
		unsigned unit		: 1;
		unsigned head		: 4;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	} b;
} select_t, ata_select_t;

/*
 * Status returned from various ide_ functions
 */
typedef enum {
	ide_stopped,	/* no drive operation was started */
	ide_started,	/* a drive operation was started, handler was set */
} ide_startstop_t;

struct ide_driver_s;
struct ide_settings_s;

#ifdef CONFIG_BLK_DEV_IDEACPI
struct ide_acpi_drive_link;
struct ide_acpi_hwif_link;
#endif

typedef struct ide_drive_s {
	char		name[4];	/* drive name, such as "hda" */
        char            driver_req[10];	/* requests specific driver */

	struct request_queue	*queue;	/* request queue */

	struct request		*rq;	/* current request */
	struct ide_drive_s 	*next;	/* circular list of hwgroup drives */
	void		*driver_data;	/* extra driver data */
	struct hd_driveid	*id;	/* drive model identification info */
#ifdef CONFIG_IDE_PROC_FS
	struct proc_dir_entry *proc;	/* /proc/ide/ directory entry */
	struct ide_settings_s *settings;/* /proc/ide/ drive settings */
#endif
	struct hwif_s		*hwif;	/* actually (ide_hwif_t *) */

	unsigned long sleep;		/* sleep until this time */
	unsigned long service_start;	/* time we started last request */
	unsigned long service_time;	/* service time of last request */
	unsigned long timeout;		/* max time to wait for irq */

	special_t	special;	/* special action flags */
	select_t	select;		/* basic drive/head select reg value */

	u8	keep_settings;		/* restore settings after drive reset */
	u8	using_dma;		/* disk is using dma for read/write */
	u8	retry_pio;		/* retrying dma capable host in pio */
	u8	state;			/* retry state */
	u8	waiting_for_dma;	/* dma currently in progress */
	u8	unmask;			/* okay to unmask other irqs */
	u8	noflush;		/* don't attempt flushes */
	u8	dsc_overlap;		/* DSC overlap */
	u8	nice1;			/* give potential excess bandwidth */

	unsigned present	: 1;	/* drive is physically present */
	unsigned dead		: 1;	/* device ejected hint */
	unsigned id_read	: 1;	/* 1=id read from disk 0 = synthetic */
	unsigned noprobe 	: 1;	/* from:  hdx=noprobe */
	unsigned removable	: 1;	/* 1 if need to do check_media_change */
	unsigned attach		: 1;	/* needed for removable devices */
	unsigned forced_geom	: 1;	/* 1 if hdx=c,h,s was given at boot */
	unsigned no_unmask	: 1;	/* disallow setting unmask bit */
	unsigned no_io_32bit	: 1;	/* disallow enabling 32bit I/O */
	unsigned atapi_overlap	: 1;	/* ATAPI overlap (not supported) */
	unsigned doorlocking	: 1;	/* for removable only: door lock/unlock works */
	unsigned nodma		: 1;	/* disallow DMA */
	unsigned autotune	: 2;	/* 0=default, 1=autotune, 2=noautotune */
	unsigned remap_0_to_1	: 1;	/* 0=noremap, 1=remap 0->1 (for EZDrive) */
	unsigned blocked        : 1;	/* 1=powermanagment told us not to do anything, so sleep nicely */
	unsigned vdma		: 1;	/* 1=doing PIO over DMA 0=doing normal DMA */
	unsigned scsi		: 1;	/* 0=default, 1=ide-scsi emulation */
	unsigned sleeping	: 1;	/* 1=sleeping & sleep field valid */
	unsigned post_reset	: 1;
	unsigned udma33_warned	: 1;

	u8	addressing;	/* 0=28-bit, 1=48-bit, 2=48-bit doing 28-bit */
        u8	quirk_list;	/* considered quirky, set for a specific host */
        u8	init_speed;	/* transfer rate set at boot */
        u8	current_speed;	/* current transfer rate set */
	u8	desired_speed;	/* desired transfer rate set */
        u8	dn;		/* now wide spread use */
        u8	wcache;		/* status of write cache */
	u8	acoustic;	/* acoustic management */
	u8	media;		/* disk, cdrom, tape, floppy, ... */
	u8	ctl;		/* "normal" value for Control register */
	u8	ready_stat;	/* min status value for drive ready */
	u8	mult_count;	/* current multiple sector setting */
	u8	mult_req;	/* requested multiple sector setting */
	u8	tune_req;	/* requested drive tuning setting */
	u8	io_32bit;	/* 0=16-bit, 1=32-bit, 2/3=32bit+sync */
	u8	bad_wstat;	/* used for ignoring WRERR_STAT */
	u8	nowerr;		/* used for ignoring WRERR_STAT */
	u8	sect0;		/* offset of first sector for DM6:DDO */
	u8	head;		/* "real" number of heads */
	u8	sect;		/* "real" sectors per track */
	u8	bios_head;	/* BIOS/fdisk/LILO number of heads */
	u8	bios_sect;	/* BIOS/fdisk/LILO sectors per track */

	unsigned int	bios_cyl;	/* BIOS/fdisk/LILO number of cyls */
	unsigned int	cyl;		/* "real" number of cyls */
	unsigned int	drive_data;	/* used by set_pio_mode/selectproc */
	unsigned int	failures;	/* current failure count */
	unsigned int	max_failures;	/* maximum allowed failure count */
	u64		probed_capacity;/* initial reported media capacity (ide-cd only currently) */

	u64		capacity64;	/* total number of sectors */

	int		lun;		/* logical unit */
	int		crc_count;	/* crc counter to reduce drive speed */
#ifdef CONFIG_BLK_DEV_IDEACPI
	struct ide_acpi_drive_link *acpidata;
#endif
	struct list_head list;
	struct device	gendev;
	struct completion gendev_rel_comp;	/* to deal with device release() */
} ide_drive_t;

#define to_ide_device(dev)container_of(dev, ide_drive_t, gendev)

#define IDE_CHIPSET_PCI_MASK	\
    ((1<<ide_pci)|(1<<ide_cmd646)|(1<<ide_ali14xx))
#define IDE_CHIPSET_IS_PCI(c)	((IDE_CHIPSET_PCI_MASK >> (c)) & 1)

struct ide_port_info;

typedef struct hwif_s {
	struct hwif_s *next;		/* for linked-list in ide_hwgroup_t */
	struct hwif_s *mate;		/* other hwif from same PCI chip */
	struct hwgroup_s *hwgroup;	/* actually (ide_hwgroup_t *) */
	struct proc_dir_entry *proc;	/* /proc/ide/ directory entry */

	char name[6];			/* name of interface, eg. "ide0" */

		/* task file registers for pata and sata */
	unsigned long	io_ports[IDE_NR_PORTS];
	unsigned long	sata_scr[SATA_NR_PORTS];

	ide_drive_t	drives[MAX_DRIVES];	/* drive info */

	u8 major;	/* our major number */
	u8 index;	/* 0 for ide0; 1 for ide1; ... */
	u8 channel;	/* for dual-port chips: 0=primary, 1=secondary */
	u8 bus_state;	/* power state of the IDE bus */

	u32 host_flags;

	u8 pio_mask;

	u8 ultra_mask;
	u8 mwdma_mask;
	u8 swdma_mask;

	u8 cbl;		/* cable type */

	hwif_chipset_t chipset;	/* sub-module for tuning.. */

	struct device *dev;

	const struct ide_port_info *cds;	/* chipset device struct */

	ide_ack_intr_t *ack_intr;

	void (*rw_disk)(ide_drive_t *, struct request *);

#if 0
	ide_hwif_ops_t	*hwifops;
#else
	/* host specific initialization of devices on a port */
	void	(*port_init_devs)(struct hwif_s *);
	/* routine to program host for PIO mode */
	void	(*set_pio_mode)(ide_drive_t *, const u8);
	/* routine to program host for DMA mode */
	void	(*set_dma_mode)(ide_drive_t *, const u8);
	/* tweaks hardware to select drive */
	void	(*selectproc)(ide_drive_t *);
	/* chipset polling based on hba specifics */
	int	(*reset_poll)(ide_drive_t *);
	/* chipset specific changes to default for device-hba resets */
	void	(*pre_reset)(ide_drive_t *);
	/* routine to reset controller after a disk reset */
	void	(*resetproc)(ide_drive_t *);
	/* special host masking for drive selection */
	void	(*maskproc)(ide_drive_t *, int);
	/* check host's drive quirk list */
	void	(*quirkproc)(ide_drive_t *);
#endif
	u8 (*mdma_filter)(ide_drive_t *);
	u8 (*udma_filter)(ide_drive_t *);

	u8 (*cable_detect)(struct hwif_s *);

	void (*ata_input_data)(ide_drive_t *, void *, u32);
	void (*ata_output_data)(ide_drive_t *, void *, u32);

	void (*atapi_input_bytes)(ide_drive_t *, void *, u32);
	void (*atapi_output_bytes)(ide_drive_t *, void *, u32);

	void (*dma_host_set)(ide_drive_t *, int);
	int (*dma_setup)(ide_drive_t *);
	void (*dma_exec_cmd)(ide_drive_t *, u8);
	void (*dma_start)(ide_drive_t *);
	int (*ide_dma_end)(ide_drive_t *drive);
	int (*ide_dma_test_irq)(ide_drive_t *drive);
	void (*ide_dma_clear_irq)(ide_drive_t *drive);
	void (*dma_lost_irq)(ide_drive_t *drive);
	void (*dma_timeout)(ide_drive_t *drive);

	void (*OUTB)(u8 addr, unsigned long port);
	void (*OUTBSYNC)(ide_drive_t *drive, u8 addr, unsigned long port);
	void (*OUTW)(u16 addr, unsigned long port);
	void (*OUTSW)(unsigned long port, void *addr, u32 count);
	void (*OUTSL)(unsigned long port, void *addr, u32 count);

	u8  (*INB)(unsigned long port);
	u16 (*INW)(unsigned long port);
	void (*INSW)(unsigned long port, void *addr, u32 count);
	void (*INSL)(unsigned long port, void *addr, u32 count);

	/* dma physical region descriptor table (cpu view) */
	unsigned int	*dmatable_cpu;
	/* dma physical region descriptor table (dma view) */
	dma_addr_t	dmatable_dma;
	/* Scatter-gather list used to build the above */
	struct scatterlist *sg_table;
	int sg_max_nents;		/* Maximum number of entries in it */
	int sg_nents;			/* Current number of entries in it */
	int sg_dma_direction;		/* dma transfer direction */

	/* data phase of the active command (currently only valid for PIO/DMA) */
	int		data_phase;

	unsigned int nsect;
	unsigned int nleft;
	struct scatterlist *cursg;
	unsigned int cursg_ofs;

	int		rqsize;		/* max sectors per request */
	int		irq;		/* our irq number */

	unsigned long	dma_base;	/* base addr for dma ports */
	unsigned long	dma_command;	/* dma command register */
	unsigned long	dma_vendor1;	/* dma vendor 1 register */
	unsigned long	dma_status;	/* dma status register */
	unsigned long	dma_vendor3;	/* dma vendor 3 register */
	unsigned long	dma_prdtable;	/* actual prd table address */

	unsigned long	config_data;	/* for use by chipset-specific code */
	unsigned long	select_data;	/* for use by chipset-specific code */

	unsigned long	extra_base;	/* extra addr for dma ports */
	unsigned	extra_ports;	/* number of extra dma ports */

	unsigned	noprobe    : 1;	/* don't probe for this interface */
	unsigned	present    : 1;	/* this interface exists */
	unsigned	serialized : 1;	/* serialized all channel operation */
	unsigned	sharing_irq: 1;	/* 1 = sharing irq with another hwif */
	unsigned	reset      : 1;	/* reset after probe */
	unsigned	sg_mapped  : 1;	/* sg_table and sg_nents are ready */
	unsigned	mmio       : 1; /* host uses MMIO */
	unsigned	straight8  : 1;	/* Alan's straight 8 check */

	struct device		gendev;
	struct device		*portdev;

	struct completion gendev_rel_comp; /* To deal with device release() */

	void		*hwif_data;	/* extra hwif data */

	unsigned dma;

#ifdef CONFIG_BLK_DEV_IDEACPI
	struct ide_acpi_hwif_link *acpidata;
#endif
} ____cacheline_internodealigned_in_smp ide_hwif_t;

/*
 *  internal ide interrupt handler type
 */
typedef ide_startstop_t (ide_handler_t)(ide_drive_t *);
typedef int (ide_expiry_t)(ide_drive_t *);

/* used by ide-cd, ide-floppy, etc. */
typedef void (xfer_func_t)(ide_drive_t *, void *, u32);

typedef struct hwgroup_s {
		/* irq handler, if active */
	ide_startstop_t	(*handler)(ide_drive_t *);

		/* BOOL: protects all fields below */
	volatile int busy;
		/* BOOL: wake us up on timer expiry */
	unsigned int sleeping	: 1;
		/* BOOL: polling active & poll_timeout field valid */
	unsigned int polling	: 1;
	 	/* BOOL: in a polling reset situation. Must not trigger another reset yet */
	unsigned int resetting  : 1;

		/* current drive */
	ide_drive_t *drive;
		/* ptr to current hwif in linked-list */
	ide_hwif_t *hwif;

		/* current request */
	struct request *rq;

		/* failsafe timer */
	struct timer_list timer;
		/* timeout value during long polls */
	unsigned long poll_timeout;
		/* queried upon timeouts */
	int (*expiry)(ide_drive_t *);

	int req_gen;
	int req_gen_timer;
} ide_hwgroup_t;

typedef struct ide_driver_s ide_driver_t;

extern struct mutex ide_setting_mtx;

int set_io_32bit(ide_drive_t *, int);
int set_pio_mode(ide_drive_t *, int);
int set_using_dma(ide_drive_t *, int);

/* ATAPI packet command flags */
enum {
	/* set when an error is considered normal - no retry (ide-tape) */
	PC_FLAG_ABORT			= (1 << 0),
	PC_FLAG_SUPPRESS_ERROR		= (1 << 1),
	PC_FLAG_WAIT_FOR_DSC		= (1 << 2),
	PC_FLAG_DMA_OK			= (1 << 3),
	PC_FLAG_DMA_RECOMMENDED		= (1 << 4),
	PC_FLAG_DMA_IN_PROGRESS		= (1 << 5),
	PC_FLAG_DMA_ERROR		= (1 << 6),
	PC_FLAG_WRITING			= (1 << 7),
	/* command timed out */
	PC_FLAG_TIMEDOUT		= (1 << 8),
};

struct ide_atapi_pc {
	/* actual packet bytes */
	u8 c[12];
	/* incremented on each retry */
	int retries;
	int error;

	/* bytes to transfer */
	int req_xfer;
	/* bytes actually transferred */
	int xferred;

	/* data buffer */
	u8 *buf;
	/* current buffer position */
	u8 *cur_pos;
	int buf_size;
	/* missing/available data on the current buffer */
	int b_count;

	/* the corresponding request */
	struct request *rq;

	unsigned long flags;

	/*
	 * those are more or less driver-specific and some of them are subject
	 * to change/removal later.
	 */
	u8 pc_buf[256];
	void (*idefloppy_callback) (ide_drive_t *);
	ide_startstop_t (*idetape_callback) (ide_drive_t *);

	/* idetape only */
	struct idetape_bh *bh;
	char *b_data;

	/* idescsi only for now */
	struct scatterlist *sg;
	unsigned int sg_cnt;

	struct scsi_cmnd *scsi_cmd;
	void (*done) (struct scsi_cmnd *);

	unsigned long timeout;
};

#ifdef CONFIG_IDE_PROC_FS
/*
 * configurable drive settings
 */

#define TYPE_INT	0
#define TYPE_BYTE	1
#define TYPE_SHORT	2

#define SETTING_READ	(1 << 0)
#define SETTING_WRITE	(1 << 1)
#define SETTING_RW	(SETTING_READ | SETTING_WRITE)

typedef int (ide_procset_t)(ide_drive_t *, int);
typedef struct ide_settings_s {
	char			*name;
	int			rw;
	int			data_type;
	int			min;
	int			max;
	int			mul_factor;
	int			div_factor;
	void			*data;
	ide_procset_t		*set;
	int			auto_remove;
	struct ide_settings_s	*next;
} ide_settings_t;

int ide_add_setting(ide_drive_t *, const char *, int, int, int, int, int, int, void *, ide_procset_t *set);

/*
 * /proc/ide interface
 */
typedef struct {
	const char	*name;
	mode_t		mode;
	read_proc_t	*read_proc;
	write_proc_t	*write_proc;
} ide_proc_entry_t;

void proc_ide_create(void);
void proc_ide_destroy(void);
void ide_proc_register_port(ide_hwif_t *);
void ide_proc_port_register_devices(ide_hwif_t *);
void ide_proc_unregister_device(ide_drive_t *);
void ide_proc_unregister_port(ide_hwif_t *);
void ide_proc_register_driver(ide_drive_t *, ide_driver_t *);
void ide_proc_unregister_driver(ide_drive_t *, ide_driver_t *);

void ide_add_generic_settings(ide_drive_t *);

read_proc_t proc_ide_read_capacity;
read_proc_t proc_ide_read_geometry;

#ifdef CONFIG_BLK_DEV_IDEPCI
void ide_pci_create_host_proc(const char *, get_info_t *);
#endif

/*
 * Standard exit stuff:
 */
#define PROC_IDE_READ_RETURN(page,start,off,count,eof,len) \
{					\
	len -= off;			\
	if (len < count) {		\
		*eof = 1;		\
		if (len <= 0)		\
			return 0;	\
	} else				\
		len = count;		\
	*start = page + off;		\
	return len;			\
}
#else
static inline void proc_ide_create(void) { ; }
static inline void proc_ide_destroy(void) { ; }
static inline void ide_proc_register_port(ide_hwif_t *hwif) { ; }
static inline void ide_proc_port_register_devices(ide_hwif_t *hwif) { ; }
static inline void ide_proc_unregister_device(ide_drive_t *drive) { ; }
static inline void ide_proc_unregister_port(ide_hwif_t *hwif) { ; }
static inline void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver) { ; }
static inline void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver) { ; }
static inline void ide_add_generic_settings(ide_drive_t *drive) { ; }
#define PROC_IDE_READ_RETURN(page,start,off,count,eof,len) return 0;
#endif

/*
 * Power Management step value (rq->pm->pm_step).
 *
 * The step value starts at 0 (ide_pm_state_start_suspend) for a
 * suspend operation or 1000 (ide_pm_state_start_resume) for a
 * resume operation.
 *
 * For each step, the core calls the subdriver start_power_step() first.
 * This can return:
 *	- ide_stopped :	In this case, the core calls us back again unless
 *			step have been set to ide_power_state_completed.
 *	- ide_started :	In this case, the channel is left busy until an
 *			async event (interrupt) occurs.
 * Typically, start_power_step() will issue a taskfile request with
 * do_rw_taskfile().
 *
 * Upon reception of the interrupt, the core will call complete_power_step()
 * with the error code if any. This routine should update the step value
 * and return. It should not start a new request. The core will call
 * start_power_step for the new step value, unless step have been set to
 * ide_power_state_completed.
 *
 * Subdrivers are expected to define their own additional power
 * steps from 1..999 for suspend and from 1001..1999 for resume,
 * other values are reserved for future use.
 */

enum {
	ide_pm_state_completed		= -1,
	ide_pm_state_start_suspend	= 0,
	ide_pm_state_start_resume	= 1000,
};

/*
 * Subdrivers support.
 *
 * The gendriver.owner field should be set to the module owner of this driver.
 * The gendriver.name field should be set to the name of this driver
 */
struct ide_driver_s {
	const char			*version;
	u8				media;
	unsigned supports_dsc_overlap	: 1;
	ide_startstop_t	(*do_request)(ide_drive_t *, struct request *, sector_t);
	int		(*end_request)(ide_drive_t *, int, int);
	ide_startstop_t	(*error)(ide_drive_t *, struct request *rq, u8, u8);
	ide_startstop_t	(*abort)(ide_drive_t *, struct request *rq);
	struct device_driver	gen_driver;
	int		(*probe)(ide_drive_t *);
	void		(*remove)(ide_drive_t *);
	void		(*resume)(ide_drive_t *);
	void		(*shutdown)(ide_drive_t *);
#ifdef CONFIG_IDE_PROC_FS
	ide_proc_entry_t	*proc;
#endif
};

#define to_ide_driver(drv) container_of(drv, ide_driver_t, gen_driver)

int generic_ide_ioctl(ide_drive_t *, struct file *, struct block_device *, unsigned, unsigned long);

/*
 * ide_hwifs[] is the master data structure used to keep track
 * of just about everything in ide.c.  Whenever possible, routines
 * should be using pointers to a drive (ide_drive_t *) or
 * pointers to a hwif (ide_hwif_t *), rather than indexing this
 * structure directly (the allocation/layout may change!).
 *
 */
#ifndef _IDE_C
extern	ide_hwif_t	ide_hwifs[];		/* master data repository */
#endif
extern int noautodma;

extern int ide_end_request (ide_drive_t *drive, int uptodate, int nrsecs);
int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq,
			     int uptodate, int nr_sectors);

extern void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry);

void ide_execute_command(ide_drive_t *, u8, ide_handler_t *, unsigned int,
			 ide_expiry_t *);

ide_startstop_t __ide_error(ide_drive_t *, struct request *, u8, u8);

ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, byte stat);

ide_startstop_t __ide_abort(ide_drive_t *, struct request *);

extern ide_startstop_t ide_abort(ide_drive_t *, const char *);

extern void ide_fix_driveid(struct hd_driveid *);

extern void ide_fixstring(u8 *, const int, const int);

int ide_wait_stat(ide_startstop_t *, ide_drive_t *, u8, u8, unsigned long);

extern ide_startstop_t ide_do_reset (ide_drive_t *);

extern void ide_init_drive_cmd (struct request *rq);

/*
 * "action" parameter type for ide_do_drive_cmd() below.
 */
typedef enum {
	ide_wait,	/* insert rq at end of list, and wait for it */
	ide_preempt,	/* insert rq in front of current request */
	ide_head_wait,	/* insert rq in front of current request and wait for it */
	ide_end		/* insert rq at end of list, but don't wait for it */
} ide_action_t;

extern int ide_do_drive_cmd(ide_drive_t *, struct request *, ide_action_t);

extern void ide_end_drive_cmd(ide_drive_t *, u8, u8);

enum {
	IDE_TFLAG_LBA48			= (1 << 0),
	IDE_TFLAG_NO_SELECT_MASK	= (1 << 1),
	IDE_TFLAG_FLAGGED		= (1 << 2),
	IDE_TFLAG_OUT_DATA		= (1 << 3),
	IDE_TFLAG_OUT_HOB_FEATURE	= (1 << 4),
	IDE_TFLAG_OUT_HOB_NSECT		= (1 << 5),
	IDE_TFLAG_OUT_HOB_LBAL		= (1 << 6),
	IDE_TFLAG_OUT_HOB_LBAM		= (1 << 7),
	IDE_TFLAG_OUT_HOB_LBAH		= (1 << 8),
	IDE_TFLAG_OUT_HOB		= IDE_TFLAG_OUT_HOB_FEATURE |
					  IDE_TFLAG_OUT_HOB_NSECT |
					  IDE_TFLAG_OUT_HOB_LBAL |
					  IDE_TFLAG_OUT_HOB_LBAM |
					  IDE_TFLAG_OUT_HOB_LBAH,
	IDE_TFLAG_OUT_FEATURE		= (1 << 9),
	IDE_TFLAG_OUT_NSECT		= (1 << 10),
	IDE_TFLAG_OUT_LBAL		= (1 << 11),
	IDE_TFLAG_OUT_LBAM		= (1 << 12),
	IDE_TFLAG_OUT_LBAH		= (1 << 13),
	IDE_TFLAG_OUT_TF		= IDE_TFLAG_OUT_FEATURE |
					  IDE_TFLAG_OUT_NSECT |
					  IDE_TFLAG_OUT_LBAL |
					  IDE_TFLAG_OUT_LBAM |
					  IDE_TFLAG_OUT_LBAH,
	IDE_TFLAG_OUT_DEVICE		= (1 << 14),
	IDE_TFLAG_WRITE			= (1 << 15),
	IDE_TFLAG_FLAGGED_SET_IN_FLAGS	= (1 << 16),
	IDE_TFLAG_IN_DATA		= (1 << 17),
	IDE_TFLAG_CUSTOM_HANDLER	= (1 << 18),
	IDE_TFLAG_DMA_PIO_FALLBACK	= (1 << 19),
	IDE_TFLAG_IN_HOB_FEATURE	= (1 << 20),
	IDE_TFLAG_IN_HOB_NSECT		= (1 << 21),
	IDE_TFLAG_IN_HOB_LBAL		= (1 << 22),
	IDE_TFLAG_IN_HOB_LBAM		= (1 << 23),
	IDE_TFLAG_IN_HOB_LBAH		= (1 << 24),
	IDE_TFLAG_IN_HOB_LBA		= IDE_TFLAG_IN_HOB_LBAL |
					  IDE_TFLAG_IN_HOB_LBAM |
					  IDE_TFLAG_IN_HOB_LBAH,
	IDE_TFLAG_IN_HOB		= IDE_TFLAG_IN_HOB_FEATURE |
					  IDE_TFLAG_IN_HOB_NSECT |
					  IDE_TFLAG_IN_HOB_LBA,
	IDE_TFLAG_IN_NSECT		= (1 << 25),
	IDE_TFLAG_IN_LBAL		= (1 << 26),
	IDE_TFLAG_IN_LBAM		= (1 << 27),
	IDE_TFLAG_IN_LBAH		= (1 << 28),
	IDE_TFLAG_IN_LBA		= IDE_TFLAG_IN_LBAL |
					  IDE_TFLAG_IN_LBAM |
					  IDE_TFLAG_IN_LBAH,
	IDE_TFLAG_IN_TF			= IDE_TFLAG_IN_NSECT |
					  IDE_TFLAG_IN_LBA,
	IDE_TFLAG_IN_DEVICE		= (1 << 29),
	IDE_TFLAG_HOB			= IDE_TFLAG_OUT_HOB |
					  IDE_TFLAG_IN_HOB,
	IDE_TFLAG_TF			= IDE_TFLAG_OUT_TF |
					  IDE_TFLAG_IN_TF,
	IDE_TFLAG_DEVICE		= IDE_TFLAG_OUT_DEVICE |
					  IDE_TFLAG_IN_DEVICE,
	/* force 16-bit I/O operations */
	IDE_TFLAG_IO_16BIT		= (1 << 30),
	/* ide_task_t was allocated using kmalloc() */
	IDE_TFLAG_DYN			= (1 << 31),
};

struct ide_taskfile {
	u8	hob_data;	/*  0: high data byte (for TASKFILE IOCTL) */

	u8	hob_feature;	/*  1-5: additional data to support LBA48 */
	u8	hob_nsect;
	u8	hob_lbal;
	u8	hob_lbam;
	u8	hob_lbah;

	u8	data;		/*  6: low data byte (for TASKFILE IOCTL) */

	union {			/*  7: */
		u8 error;	/*   read:  error */
		u8 feature;	/*  write: feature */
	};

	u8	nsect;		/*  8: number of sectors */
	u8	lbal;		/*  9: LBA low */
	u8	lbam;		/* 10: LBA mid */
	u8	lbah;		/* 11: LBA high */

	u8	device;		/* 12: device select */

	union {			/* 13: */
		u8 status;	/*  read: status  */
		u8 command;	/* write: command */
	};
};

typedef struct ide_task_s {
	union {
		struct ide_taskfile	tf;
		u8			tf_array[14];
	};
	u32			tf_flags;
	int			data_phase;
	struct request		*rq;		/* copy of request */
	void			*special;	/* valid_t generally */
} ide_task_t;

void ide_tf_load(ide_drive_t *, ide_task_t *);
void ide_tf_read(ide_drive_t *, ide_task_t *);

extern void SELECT_DRIVE(ide_drive_t *);
extern void SELECT_MASK(ide_drive_t *, int);

extern int drive_is_ready(ide_drive_t *);

void ide_pktcmd_tf_load(ide_drive_t *, u32, u16, u8);

ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);

void task_end_request(ide_drive_t *, struct request *, u8);

int ide_raw_taskfile(ide_drive_t *, ide_task_t *, u8 *, u16);
int ide_no_data_taskfile(ide_drive_t *, ide_task_t *);

int ide_taskfile_ioctl(ide_drive_t *, unsigned int, unsigned long);
int ide_cmd_ioctl(ide_drive_t *, unsigned int, unsigned long);
int ide_task_ioctl(ide_drive_t *, unsigned int, unsigned long);

extern int system_bus_clock(void);

extern int ide_driveid_update(ide_drive_t *);
extern int ide_config_drive_speed(ide_drive_t *, u8);
extern u8 eighty_ninty_three (ide_drive_t *);
extern int taskfile_lib_get_identify(ide_drive_t *drive, u8 *);

extern int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout);

extern void ide_stall_queue(ide_drive_t *drive, unsigned long timeout);

extern int ide_spin_wait_hwgroup(ide_drive_t *);
extern void ide_timer_expiry(unsigned long);
extern irqreturn_t ide_intr(int irq, void *dev_id);
extern void do_ide_request(struct request_queue *);

void ide_init_disk(struct gendisk *, ide_drive_t *);

#ifdef CONFIG_IDEPCI_PCIBUS_ORDER
extern int __ide_pci_register_driver(struct pci_driver *driver, struct module *owner, const char *mod_name);
#define ide_pci_register_driver(d) __ide_pci_register_driver(d, THIS_MODULE, KBUILD_MODNAME)
#else
#define ide_pci_register_driver(d) pci_register_driver(d)
#endif

void ide_pci_setup_ports(struct pci_dev *, const struct ide_port_info *, int, u8 *);
void ide_setup_pci_noise(struct pci_dev *, const struct ide_port_info *);

#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
void ide_hwif_setup_dma(ide_hwif_t *, const struct ide_port_info *);
#else
static inline void ide_hwif_setup_dma(ide_hwif_t *hwif,
				      const struct ide_port_info *d) { }
#endif

extern void default_hwif_iops(ide_hwif_t *);
extern void default_hwif_mmiops(ide_hwif_t *);
extern void default_hwif_transport(ide_hwif_t *);

typedef struct ide_pci_enablebit_s {
	u8	reg;	/* byte pci reg holding the enable-bit */
	u8	mask;	/* mask to isolate the enable-bit */
	u8	val;	/* value of masked reg when "enabled" */
} ide_pci_enablebit_t;

enum {
	/* Uses ISA control ports not PCI ones. */
	IDE_HFLAG_ISA_PORTS		= (1 << 0),
	/* single port device */
	IDE_HFLAG_SINGLE		= (1 << 1),
	/* don't use legacy PIO blacklist */
	IDE_HFLAG_PIO_NO_BLACKLIST	= (1 << 2),
	/* don't use conservative PIO "downgrade" */
	IDE_HFLAG_PIO_NO_DOWNGRADE	= (1 << 3),
	/* use PIO8/9 for prefetch off/on */
	IDE_HFLAG_ABUSE_PREFETCH	= (1 << 4),
	/* use PIO6/7 for fast-devsel off/on */
	IDE_HFLAG_ABUSE_FAST_DEVSEL	= (1 << 5),
	/* use 100-102 and 200-202 PIO values to set DMA modes */
	IDE_HFLAG_ABUSE_DMA_MODES	= (1 << 6),
	/*
	 * keep DMA setting when programming PIO mode, may be used only
	 * for hosts which have separate PIO and DMA timings (ie. PMAC)
	 */
	IDE_HFLAG_SET_PIO_MODE_KEEP_DMA	= (1 << 7),
	/* program host for the transfer mode after programming device */
	IDE_HFLAG_POST_SET_MODE		= (1 << 8),
	/* don't program host/device for the transfer mode ("smart" hosts) */
	IDE_HFLAG_NO_SET_MODE		= (1 << 9),
	/* trust BIOS for programming chipset/device for DMA */
	IDE_HFLAG_TRUST_BIOS_FOR_DMA	= (1 << 10),
	/* host uses VDMA (tied with IDE_HFLAG_CS5520 for now) */
	IDE_HFLAG_VDMA			= (1 << 11),
	/* ATAPI DMA is unsupported */
	IDE_HFLAG_NO_ATAPI_DMA		= (1 << 12),
	/* set if host is a "bootable" controller */
	IDE_HFLAG_BOOTABLE		= (1 << 13),
	/* host doesn't support DMA */
	IDE_HFLAG_NO_DMA		= (1 << 14),
	/* check if host is PCI IDE device before allowing DMA */
	IDE_HFLAG_NO_AUTODMA		= (1 << 15),
	/* don't autotune PIO */
	IDE_HFLAG_NO_AUTOTUNE		= (1 << 16),
	/* host is CS5510/CS5520 */
	IDE_HFLAG_CS5520		= IDE_HFLAG_VDMA,
	/* no LBA48 */
	IDE_HFLAG_NO_LBA48		= (1 << 17),
	/* no LBA48 DMA */
	IDE_HFLAG_NO_LBA48_DMA		= (1 << 18),
	/* data FIFO is cleared by an error */
	IDE_HFLAG_ERROR_STOPS_FIFO	= (1 << 19),
	/* serialize ports */
	IDE_HFLAG_SERIALIZE		= (1 << 20),
	/* use legacy IRQs */
	IDE_HFLAG_LEGACY_IRQS		= (1 << 21),
	/* force use of legacy IRQs */
	IDE_HFLAG_FORCE_LEGACY_IRQS	= (1 << 22),
	/* limit LBA48 requests to 256 sectors */
	IDE_HFLAG_RQSIZE_256		= (1 << 23),
	/* use 32-bit I/O ops */
	IDE_HFLAG_IO_32BIT		= (1 << 24),
	/* unmask IRQs */
	IDE_HFLAG_UNMASK_IRQS		= (1 << 25),
	IDE_HFLAG_ABUSE_SET_DMA_MODE	= (1 << 26),
	/* host is CY82C693 */
	IDE_HFLAG_CY82C693		= (1 << 27),
	/* force host out of "simplex" mode */
	IDE_HFLAG_CLEAR_SIMPLEX		= (1 << 28),
	/* DSC overlap is unsupported */
	IDE_HFLAG_NO_DSC		= (1 << 29),
	/* never use 32-bit I/O ops */
	IDE_HFLAG_NO_IO_32BIT		= (1 << 30),
	/* never unmask IRQs */
	IDE_HFLAG_NO_UNMASK_IRQS	= (1 << 31),
};

#ifdef CONFIG_BLK_DEV_OFFBOARD
# define IDE_HFLAG_OFF_BOARD	IDE_HFLAG_BOOTABLE
#else
# define IDE_HFLAG_OFF_BOARD	0
#endif

struct ide_port_info {
	char			*name;
	unsigned int		(*init_chipset)(struct pci_dev *, const char *);
	void			(*init_iops)(ide_hwif_t *);
	void                    (*init_hwif)(ide_hwif_t *);
	void			(*init_dma)(ide_hwif_t *, unsigned long);
	ide_pci_enablebit_t	enablebits[2];
	hwif_chipset_t		chipset;
	u8			extra;
	u32			host_flags;
	u8			pio_mask;
	u8			swdma_mask;
	u8			mwdma_mask;
	u8			udma_mask;
};

int ide_setup_pci_device(struct pci_dev *, const struct ide_port_info *);
int ide_setup_pci_devices(struct pci_dev *, struct pci_dev *, const struct ide_port_info *);

void ide_map_sg(ide_drive_t *, struct request *);
void ide_init_sg_cmd(ide_drive_t *, struct request *);

#define BAD_DMA_DRIVE		0
#define GOOD_DMA_DRIVE		1

struct drive_list_entry {
	const char *id_model;
	const char *id_firmware;
};

int ide_in_drive_list(struct hd_driveid *, const struct drive_list_entry *);

#ifdef CONFIG_BLK_DEV_IDEDMA
int __ide_dma_bad_drive(ide_drive_t *);
int ide_id_dma_bug(ide_drive_t *);

u8 ide_find_dma_mode(ide_drive_t *, u8);

static inline u8 ide_max_dma_mode(ide_drive_t *drive)
{
	return ide_find_dma_mode(drive, XFER_UDMA_6);
}

void ide_dma_off_quietly(ide_drive_t *);
void ide_dma_off(ide_drive_t *);
void ide_dma_on(ide_drive_t *);
int ide_set_dma(ide_drive_t *);
void ide_check_dma_crc(ide_drive_t *);
ide_startstop_t ide_dma_intr(ide_drive_t *);

int ide_build_sglist(ide_drive_t *, struct request *);
void ide_destroy_dmatable(ide_drive_t *);

#ifdef CONFIG_BLK_DEV_IDEDMA_SFF
extern int ide_build_dmatable(ide_drive_t *, struct request *);
extern int ide_release_dma(ide_hwif_t *);
extern void ide_setup_dma(ide_hwif_t *, unsigned long);

void ide_dma_host_set(ide_drive_t *, int);
extern int ide_dma_setup(ide_drive_t *);
extern void ide_dma_start(ide_drive_t *);
extern int __ide_dma_end(ide_drive_t *);
extern void ide_dma_lost_irq(ide_drive_t *);
extern void ide_dma_timeout(ide_drive_t *);
#endif /* CONFIG_BLK_DEV_IDEDMA_SFF */

#else
static inline int ide_id_dma_bug(ide_drive_t *drive) { return 0; }
static inline u8 ide_find_dma_mode(ide_drive_t *drive, u8 speed) { return 0; }
static inline u8 ide_max_dma_mode(ide_drive_t *drive) { return 0; }
static inline void ide_dma_off_quietly(ide_drive_t *drive) { ; }
static inline void ide_dma_off(ide_drive_t *drive) { ; }
static inline void ide_dma_on(ide_drive_t *drive) { ; }
static inline void ide_dma_verbose(ide_drive_t *drive) { ; }
static inline int ide_set_dma(ide_drive_t *drive) { return 1; }
static inline void ide_check_dma_crc(ide_drive_t *drive) { ; }
#endif /* CONFIG_BLK_DEV_IDEDMA */

#ifndef CONFIG_BLK_DEV_IDEDMA_SFF
static inline void ide_release_dma(ide_hwif_t *drive) {;}
#endif

#ifdef CONFIG_BLK_DEV_IDEACPI
extern int ide_acpi_exec_tfs(ide_drive_t *drive);
extern void ide_acpi_get_timing(ide_hwif_t *hwif);
extern void ide_acpi_push_timing(ide_hwif_t *hwif);
extern void ide_acpi_init(ide_hwif_t *hwif);
void ide_acpi_port_init_devices(ide_hwif_t *);
extern void ide_acpi_set_state(ide_hwif_t *hwif, int on);
#else
static inline int ide_acpi_exec_tfs(ide_drive_t *drive) { return 0; }
static inline void ide_acpi_get_timing(ide_hwif_t *hwif) { ; }
static inline void ide_acpi_push_timing(ide_hwif_t *hwif) { ; }
static inline void ide_acpi_init(ide_hwif_t *hwif) { ; }
static inline void ide_acpi_port_init_devices(ide_hwif_t *hwif) { ; }
static inline void ide_acpi_set_state(ide_hwif_t *hwif, int on) {}
#endif

void ide_remove_port_from_hwgroup(ide_hwif_t *);
extern int ide_hwif_request_regions(ide_hwif_t *hwif);
extern void ide_hwif_release_regions(ide_hwif_t* hwif);
void ide_unregister(unsigned int);

void ide_register_region(struct gendisk *);
void ide_unregister_region(struct gendisk *);

void ide_undecoded_slave(ide_drive_t *);

int ide_device_add_all(u8 *idx, const struct ide_port_info *);
int ide_device_add(u8 idx[4], const struct ide_port_info *);
void ide_port_unregister_devices(ide_hwif_t *);
void ide_port_scan(ide_hwif_t *);

static inline void *ide_get_hwifdata (ide_hwif_t * hwif)
{
	return hwif->hwif_data;
}

static inline void ide_set_hwifdata (ide_hwif_t * hwif, void *data)
{
	hwif->hwif_data = data;
}

const char *ide_xfer_verbose(u8 mode);
extern void ide_toggle_bounce(ide_drive_t *drive, int on);
extern int ide_set_xfer_rate(ide_drive_t *drive, u8 rate);

static inline int ide_dev_has_iordy(struct hd_driveid *id)
{
	return ((id->field_valid & 2) && (id->capability & 8)) ? 1 : 0;
}

static inline int ide_dev_is_sata(struct hd_driveid *id)
{
	/*
	 * See if word 93 is 0 AND drive is at least ATA-5 compatible
	 * verifying that word 80 by casting it to a signed type --
	 * this trick allows us to filter out the reserved values of
	 * 0x0000 and 0xffff along with the earlier ATA revisions...
	 */
	if (id->hw_config == 0 && (short)id->major_rev_num >= 0x0020)
		return 1;
	return 0;
}

u64 ide_get_lba_addr(struct ide_taskfile *, int);
u8 ide_dump_status(ide_drive_t *, const char *, u8);

typedef struct ide_pio_timings_s {
	int	setup_time;	/* Address setup (ns) minimum */
	int	active_time;	/* Active pulse (ns) minimum */
	int	cycle_time;	/* Cycle time (ns) minimum = */
				/* active + recovery (+ setup for some chips) */
} ide_pio_timings_t;

unsigned int ide_pio_cycle_time(ide_drive_t *, u8);
u8 ide_get_best_pio_mode(ide_drive_t *, u8, u8);
extern const ide_pio_timings_t ide_pio_timings[6];

int ide_set_pio_mode(ide_drive_t *, u8);
int ide_set_dma_mode(ide_drive_t *, u8);

void ide_set_pio(ide_drive_t *, u8);

static inline void ide_set_max_pio(ide_drive_t *drive)
{
	ide_set_pio(drive, 255);
}

extern spinlock_t ide_lock;
extern struct mutex ide_cfg_mtx;
/*
 * Structure locking:
 *
 * ide_cfg_mtx and ide_lock together protect changes to
 * ide_hwif_t->{next,hwgroup}
 * ide_drive_t->next
 *
 * ide_hwgroup_t->busy: ide_lock
 * ide_hwgroup_t->hwif: ide_lock
 * ide_hwif_t->mate: constant, no locking
 * ide_drive_t->hwif: constant, no locking
 */

#define local_irq_set(flags)	do { local_save_flags((flags)); local_irq_enable_in_hardirq(); } while (0)

extern struct bus_type ide_bus_type;
extern struct class *ide_port_class;

/* check if CACHE FLUSH (EXT) command is supported (bits defined in ATA-6) */
#define ide_id_has_flush_cache(id)	((id)->cfs_enable_2 & 0x3000)

/* some Maxtor disks have bit 13 defined incorrectly so check bit 10 too */
#define ide_id_has_flush_cache_ext(id)	\
	(((id)->cfs_enable_2 & 0x2400) == 0x2400)

static inline void ide_dump_identify(u8 *id)
{
	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 2, id, 512, 0);
}

static inline int hwif_to_node(ide_hwif_t *hwif)
{
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	return hwif->dev ? pcibus_to_node(dev->bus) : -1;
}

static inline ide_drive_t *ide_get_paired_drive(ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);

	return &hwif->drives[(drive->dn ^ 1) & 1];
}

static inline void ide_set_irq(ide_drive_t *drive, int on)
{
	ide_hwif_t *hwif = drive->hwif;

	hwif->OUTB(drive->ctl | (on ? 0 : 2),
		   hwif->io_ports[IDE_CONTROL_OFFSET]);
}

static inline u8 ide_read_status(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;

	return hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
}

static inline u8 ide_read_altstatus(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;

	return hwif->INB(hwif->io_ports[IDE_CONTROL_OFFSET]);
}

static inline u8 ide_read_error(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;

	return hwif->INB(hwif->io_ports[IDE_ERROR_OFFSET]);
}

/*
 * Too bad. The drive wants to send us data which we are not ready to accept.
 * Just throw it away.
 */
static inline void ide_atapi_discard_data(ide_drive_t *drive, unsigned bcount)
{
	ide_hwif_t *hwif = drive->hwif;

	/* FIXME: use ->atapi_input_bytes */
	while (bcount--)
		(void)hwif->INB(hwif->io_ports[IDE_DATA_OFFSET]);
}

static inline void ide_atapi_write_zeros(ide_drive_t *drive, unsigned bcount)
{
	ide_hwif_t *hwif = drive->hwif;

	/* FIXME: use ->atapi_output_bytes */
	while (bcount--)
		hwif->OUTB(0, hwif->io_ports[IDE_DATA_OFFSET]);
}

#endif /* _IDE_H */
OpenPOWER on IntegriCloud