summaryrefslogtreecommitdiff
path: root/drivers/ide/ide.c
blob: 60c5db1c59e55b56f6de5dcf4c2c9ec27fa3f878 (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
/*
 *  Copyright (C) 1994-1998	    Linus Torvalds & authors (see below)
 *  Copyrifht (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
 */

/*
 *  Mostly written by Mark Lord  <mlord@pobox.com>
 *                and Gadi Oxman <gadio@netvision.net.il>
 *                and Andre Hedrick <andre@linux-ide.org>
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 * This is the multiple IDE interface driver, as evolved from hd.c.
 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
 *   (usually 14 & 15).
 * There can be up to two drives per interface, as per the ATA-2 spec.
 *
 * ...
 *
 *  From hd.c:
 *  |
 *  | It traverses the request-list, using interrupts to jump between functions.
 *  | As nearly all functions can be called within interrupts, we may not sleep.
 *  | Special care is recommended.  Have Fun!
 *  |
 *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
 *  |
 *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
 *  | in the early extended-partition checks and added DM partitions.
 *  |
 *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
 *  |
 *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
 *  | and general streamlining by Mark Lord (mlord@pobox.com).
 *
 *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
 *
 *	Mark Lord	(mlord@pobox.com)		(IDE Perf.Pkg)
 *	Delman Lee	(delman@ieee.org)		("Mr. atdisk2")
 *	Scott Snyder	(snyder@fnald0.fnal.gov)	(ATAPI IDE cd-rom)
 *
 *  This was a rewrite of just about everything from hd.c, though some original
 *  code is still sprinkled about.  Think of it as a major evolution, with
 *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
 */

#define _IDE_C			/* Tell ide.h it's really us */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/completion.h>
#include <linux/device.h>


/* default maximum number of failures */
#define IDE_DEFAULT_MAX_FAILURES 	1

struct class *ide_port_class;

static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
					IDE2_MAJOR, IDE3_MAJOR,
					IDE4_MAJOR, IDE5_MAJOR,
					IDE6_MAJOR, IDE7_MAJOR,
					IDE8_MAJOR, IDE9_MAJOR };

DEFINE_MUTEX(ide_cfg_mtx);

__cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
EXPORT_SYMBOL(ide_lock);

static void ide_port_init_devices_data(ide_hwif_t *);

/*
 * Do not even *think* about calling this!
 */
void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
{
	/* bulk initialize hwif & drive info with zeros */
	memset(hwif, 0, sizeof(ide_hwif_t));

	/* fill in any non-zero initial values */
	hwif->index	= index;
	hwif->major	= ide_hwif_to_major[index];

	hwif->name[0]	= 'i';
	hwif->name[1]	= 'd';
	hwif->name[2]	= 'e';
	hwif->name[3]	= '0' + index;

	hwif->bus_state	= BUSSTATE_ON;

	init_completion(&hwif->gendev_rel_comp);

	hwif->tp_ops = &default_tp_ops;

	ide_port_init_devices_data(hwif);
}

static void ide_port_init_devices_data(ide_hwif_t *hwif)
{
	int unit;

	for (unit = 0; unit < MAX_DRIVES; ++unit) {
		ide_drive_t *drive = &hwif->drives[unit];
		u8 j = (hwif->index * MAX_DRIVES) + unit;

		memset(drive, 0, sizeof(*drive));

		drive->media			= ide_disk;
		drive->select.all		= (unit<<4)|0xa0;
		drive->hwif			= hwif;
		drive->ready_stat		= READY_STAT;
		drive->bad_wstat		= BAD_W_STAT;
		drive->special.b.recalibrate	= 1;
		drive->special.b.set_geometry	= 1;
		drive->name[0]			= 'h';
		drive->name[1]			= 'd';
		drive->name[2]			= 'a' + j;
		drive->max_failures		= IDE_DEFAULT_MAX_FAILURES;

		INIT_LIST_HEAD(&drive->list);
		init_completion(&drive->gendev_rel_comp);
	}
}

/* Called with ide_lock held. */
static void __ide_port_unregister_devices(ide_hwif_t *hwif)
{
	int i;

	for (i = 0; i < MAX_DRIVES; i++) {
		ide_drive_t *drive = &hwif->drives[i];

		if (drive->present) {
			spin_unlock_irq(&ide_lock);
			device_unregister(&drive->gendev);
			wait_for_completion(&drive->gendev_rel_comp);
			spin_lock_irq(&ide_lock);
		}
	}
}

void ide_port_unregister_devices(ide_hwif_t *hwif)
{
	mutex_lock(&ide_cfg_mtx);
	spin_lock_irq(&ide_lock);
	__ide_port_unregister_devices(hwif);
	hwif->present = 0;
	ide_port_init_devices_data(hwif);
	spin_unlock_irq(&ide_lock);
	mutex_unlock(&ide_cfg_mtx);
}
EXPORT_SYMBOL_GPL(ide_port_unregister_devices);

/**
 *	ide_unregister		-	free an IDE interface
 *	@hwif: IDE interface
 *
 *	Perform the final unregister of an IDE interface. At the moment
 *	we don't refcount interfaces so this will also get split up.
 *
 *	Locking:
 *	The caller must not hold the IDE locks
 *	The drive present/vanishing is not yet properly locked
 *	Take care with the callbacks. These have been split to avoid
 *	deadlocking the IDE layer. The shutdown callback is called
 *	before we take the lock and free resources. It is up to the
 *	caller to be sure there is no pending I/O here, and that
 *	the interface will not be reopened (present/vanishing locking
 *	isn't yet done BTW). After we commit to the final kill we
 *	call the cleanup callback with the ide locks held.
 *
 *	Unregister restores the hwif structures to the default state.
 *	This is raving bonkers.
 */

void ide_unregister(ide_hwif_t *hwif)
{
	ide_hwif_t *g;
	ide_hwgroup_t *hwgroup;
	int irq_count = 0;

	BUG_ON(in_interrupt());
	BUG_ON(irqs_disabled());

	mutex_lock(&ide_cfg_mtx);

	spin_lock_irq(&ide_lock);
	if (hwif->present) {
		__ide_port_unregister_devices(hwif);
		hwif->present = 0;
	}
	spin_unlock_irq(&ide_lock);

	ide_proc_unregister_port(hwif);

	hwgroup = hwif->hwgroup;
	/*
	 * free the irq if we were the only hwif using it
	 */
	g = hwgroup->hwif;
	do {
		if (g->irq == hwif->irq)
			++irq_count;
		g = g->next;
	} while (g != hwgroup->hwif);
	if (irq_count == 1)
		free_irq(hwif->irq, hwgroup);

	ide_remove_port_from_hwgroup(hwif);

	device_unregister(hwif->portdev);
	device_unregister(&hwif->gendev);
	wait_for_completion(&hwif->gendev_rel_comp);

	/*
	 * Remove us from the kernel's knowledge
	 */
	blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
	kfree(hwif->sg_table);
	unregister_blkdev(hwif->major, hwif->name);

	if (hwif->dma_base)
		ide_release_dma_engine(hwif);

	spin_lock_irq(&ide_lock);
	/* restore hwif data to pristine status */
	ide_init_port_data(hwif, hwif->index);
	spin_unlock_irq(&ide_lock);

	mutex_unlock(&ide_cfg_mtx);
}

void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
{
	memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
	hwif->irq = hw->irq;
	hwif->chipset = hw->chipset;
	hwif->dev = hw->dev;
	hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
	hwif->ack_intr = hw->ack_intr;
	hwif->config_data = hw->config;
}

/*
 *	Locks for IDE setting functionality
 */

DEFINE_MUTEX(ide_setting_mtx);

EXPORT_SYMBOL_GPL(ide_setting_mtx);

/**
 *	ide_spin_wait_hwgroup	-	wait for group
 *	@drive: drive in the group
 *
 *	Wait for an IDE device group to go non busy and then return
 *	holding the ide_lock which guards the hwgroup->busy status
 *	and right to use it.
 */

int ide_spin_wait_hwgroup (ide_drive_t *drive)
{
	ide_hwgroup_t *hwgroup = HWGROUP(drive);
	unsigned long timeout = jiffies + (3 * HZ);

	spin_lock_irq(&ide_lock);

	while (hwgroup->busy) {
		unsigned long lflags;
		spin_unlock_irq(&ide_lock);
		local_irq_set(lflags);
		if (time_after(jiffies, timeout)) {
			local_irq_restore(lflags);
			printk(KERN_ERR "%s: channel busy\n", drive->name);
			return -EBUSY;
		}
		local_irq_restore(lflags);
		spin_lock_irq(&ide_lock);
	}
	return 0;
}

EXPORT_SYMBOL(ide_spin_wait_hwgroup);

int set_io_32bit(ide_drive_t *drive, int arg)
{
	if (drive->no_io_32bit)
		return -EPERM;

	if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
		return -EINVAL;

	if (ide_spin_wait_hwgroup(drive))
		return -EBUSY;

	drive->io_32bit = arg;

	spin_unlock_irq(&ide_lock);

	return 0;
}

static int set_ksettings(ide_drive_t *drive, int arg)
{
	if (arg < 0 || arg > 1)
		return -EINVAL;

	if (ide_spin_wait_hwgroup(drive))
		return -EBUSY;
	drive->keep_settings = arg;
	spin_unlock_irq(&ide_lock);

	return 0;
}

int set_using_dma(ide_drive_t *drive, int arg)
{
#ifdef CONFIG_BLK_DEV_IDEDMA
	ide_hwif_t *hwif = drive->hwif;
	int err = -EPERM;

	if (arg < 0 || arg > 1)
		return -EINVAL;

	if (!drive->id || !(drive->id->capability & 1))
		goto out;

	if (hwif->dma_ops == NULL)
		goto out;

	err = -EBUSY;
	if (ide_spin_wait_hwgroup(drive))
		goto out;
	/*
	 * set ->busy flag, unlock and let it ride
	 */
	hwif->hwgroup->busy = 1;
	spin_unlock_irq(&ide_lock);

	err = 0;

	if (arg) {
		if (ide_set_dma(drive))
			err = -EIO;
	} else
		ide_dma_off(drive);

	/*
	 * lock, clear ->busy flag and unlock before leaving
	 */
	spin_lock_irq(&ide_lock);
	hwif->hwgroup->busy = 0;
	spin_unlock_irq(&ide_lock);
out:
	return err;
#else
	if (arg < 0 || arg > 1)
		return -EINVAL;

	return -EPERM;
#endif
}

int set_pio_mode(ide_drive_t *drive, int arg)
{
	struct request *rq;
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_port_ops *port_ops = hwif->port_ops;

	if (arg < 0 || arg > 255)
		return -EINVAL;

	if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
	    (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
		return -ENOSYS;

	if (drive->special.b.set_tune)
		return -EBUSY;

	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_ATA_TASKFILE;

	drive->tune_req = (u8) arg;
	drive->special.b.set_tune = 1;

	blk_execute_rq(drive->queue, NULL, rq, 0);
	blk_put_request(rq);

	return 0;
}

static int set_unmaskirq(ide_drive_t *drive, int arg)
{
	if (drive->no_unmask)
		return -EPERM;

	if (arg < 0 || arg > 1)
		return -EINVAL;

	if (ide_spin_wait_hwgroup(drive))
		return -EBUSY;
	drive->unmask = arg;
	spin_unlock_irq(&ide_lock);

	return 0;
}

static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
{
	ide_drive_t *drive = dev->driver_data;
	ide_hwif_t *hwif = HWIF(drive);
	struct request *rq;
	struct request_pm_state rqpm;
	ide_task_t args;
	int ret;

	/* Call ACPI _GTM only once */
	if (!(drive->dn % 2))
		ide_acpi_get_timing(hwif);

	memset(&rqpm, 0, sizeof(rqpm));
	memset(&args, 0, sizeof(args));
	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_PM_SUSPEND;
	rq->special = &args;
	rq->data = &rqpm;
	rqpm.pm_step = ide_pm_state_start_suspend;
	if (mesg.event == PM_EVENT_PRETHAW)
		mesg.event = PM_EVENT_FREEZE;
	rqpm.pm_state = mesg.event;

	ret = blk_execute_rq(drive->queue, NULL, rq, 0);
	blk_put_request(rq);
	/* only call ACPI _PS3 after both drivers are suspended */
	if (!ret && (((drive->dn % 2) && hwif->drives[0].present
		 && hwif->drives[1].present)
		 || !hwif->drives[0].present
		 || !hwif->drives[1].present))
		ide_acpi_set_state(hwif, 0);
	return ret;
}

static int generic_ide_resume(struct device *dev)
{
	ide_drive_t *drive = dev->driver_data;
	ide_hwif_t *hwif = HWIF(drive);
	struct request *rq;
	struct request_pm_state rqpm;
	ide_task_t args;
	int err;

	/* Call ACPI _STM only once */
	if (!(drive->dn % 2)) {
		ide_acpi_set_state(hwif, 1);
		ide_acpi_push_timing(hwif);
	}

	ide_acpi_exec_tfs(drive);

	memset(&rqpm, 0, sizeof(rqpm));
	memset(&args, 0, sizeof(args));
	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_PM_RESUME;
	rq->cmd_flags |= REQ_PREEMPT;
	rq->special = &args;
	rq->data = &rqpm;
	rqpm.pm_step = ide_pm_state_start_resume;
	rqpm.pm_state = PM_EVENT_ON;

	err = blk_execute_rq(drive->queue, NULL, rq, 1);
	blk_put_request(rq);

	if (err == 0 && dev->driver) {
		ide_driver_t *drv = to_ide_driver(dev->driver);

		if (drv->resume)
			drv->resume(drive);
	}

	return err;
}

static int generic_drive_reset(ide_drive_t *drive)
{
	struct request *rq;
	int ret = 0;

	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_SPECIAL;
	rq->cmd_len = 1;
	rq->cmd[0] = REQ_DRIVE_RESET;
	rq->cmd_flags |= REQ_SOFTBARRIER;
	if (blk_execute_rq(drive->queue, NULL, rq, 1))
		ret = rq->errors;
	blk_put_request(rq);
	return ret;
}

int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
			unsigned int cmd, unsigned long arg)
{
	unsigned long flags;
	ide_driver_t *drv;
	void __user *p = (void __user *)arg;
	int err = 0, (*setfunc)(ide_drive_t *, int);
	u8 *val;

	switch (cmd) {
	case HDIO_GET_32BIT:	    val = &drive->io_32bit;	 goto read_val;
	case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
	case HDIO_GET_UNMASKINTR:   val = &drive->unmask;	 goto read_val;
	case HDIO_GET_DMA:	    val = &drive->using_dma;	 goto read_val;
	case HDIO_SET_32BIT:	    setfunc = set_io_32bit;	 goto set_val;
	case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;	 goto set_val;
	case HDIO_SET_PIO_MODE:	    setfunc = set_pio_mode;	 goto set_val;
	case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;	 goto set_val;
	case HDIO_SET_DMA:	    setfunc = set_using_dma;	 goto set_val;
	}

	switch (cmd) {
		case HDIO_OBSOLETE_IDENTITY:
		case HDIO_GET_IDENTITY:
			if (bdev != bdev->bd_contains)
				return -EINVAL;
			if (drive->id_read == 0)
				return -ENOMSG;
			if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
				return -EFAULT;
			return 0;

		case HDIO_GET_NICE:
			return put_user(drive->dsc_overlap	<<	IDE_NICE_DSC_OVERLAP	|
					drive->atapi_overlap	<<	IDE_NICE_ATAPI_OVERLAP	|
					drive->nice1 << IDE_NICE_1,
					(long __user *) arg);
#ifdef CONFIG_IDE_TASK_IOCTL
		case HDIO_DRIVE_TASKFILE:
		        if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
				return -EACCES;
			switch(drive->media) {
				case ide_disk:
					return ide_taskfile_ioctl(drive, cmd, arg);
				default:
					return -ENOMSG;
			}
#endif /* CONFIG_IDE_TASK_IOCTL */

		case HDIO_DRIVE_CMD:
			if (!capable(CAP_SYS_RAWIO))
				return -EACCES;
			return ide_cmd_ioctl(drive, cmd, arg);

		case HDIO_DRIVE_TASK:
			if (!capable(CAP_SYS_RAWIO))
				return -EACCES;
			return ide_task_ioctl(drive, cmd, arg);
		case HDIO_SET_NICE:
			if (!capable(CAP_SYS_ADMIN)) return -EACCES;
			if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
				return -EPERM;
			drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
			drv = *(ide_driver_t **)bdev->bd_disk->private_data;
			if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
				drive->dsc_overlap = 0;
				return -EPERM;
			}
			drive->nice1 = (arg >> IDE_NICE_1) & 1;
			return 0;
		case HDIO_DRIVE_RESET:
			if (!capable(CAP_SYS_ADMIN))
				return -EACCES;

			return generic_drive_reset(drive);

		case HDIO_GET_BUSSTATE:
			if (!capable(CAP_SYS_ADMIN))
				return -EACCES;
			if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
				return -EFAULT;
			return 0;

		case HDIO_SET_BUSSTATE:
			if (!capable(CAP_SYS_ADMIN))
				return -EACCES;
			return -EOPNOTSUPP;
		default:
			return -EINVAL;
	}

read_val:
	mutex_lock(&ide_setting_mtx);
	spin_lock_irqsave(&ide_lock, flags);
	err = *val;
	spin_unlock_irqrestore(&ide_lock, flags);
	mutex_unlock(&ide_setting_mtx);
	return err >= 0 ? put_user(err, (long __user *)arg) : err;

set_val:
	if (bdev != bdev->bd_contains)
		err = -EINVAL;
	else {
		if (!capable(CAP_SYS_ADMIN))
			err = -EACCES;
		else {
			mutex_lock(&ide_setting_mtx);
			err = setfunc(drive, arg);
			mutex_unlock(&ide_setting_mtx);
		}
	}
	return err;
}

EXPORT_SYMBOL(generic_ide_ioctl);

static int ide_bus_match(struct device *dev, struct device_driver *drv)
{
	return 1;
}

static char *media_string(ide_drive_t *drive)
{
	switch (drive->media) {
	case ide_disk:
		return "disk";
	case ide_cdrom:
		return "cdrom";
	case ide_tape:
		return "tape";
	case ide_floppy:
		return "floppy";
	case ide_optical:
		return "optical";
	default:
		return "UNKNOWN";
	}
}

static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ide_drive_t *drive = to_ide_device(dev);
	return sprintf(buf, "%s\n", media_string(drive));
}

static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ide_drive_t *drive = to_ide_device(dev);
	return sprintf(buf, "%s\n", drive->name);
}

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ide_drive_t *drive = to_ide_device(dev);
	return sprintf(buf, "ide:m-%s\n", media_string(drive));
}

static ssize_t model_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	ide_drive_t *drive = to_ide_device(dev);
	return sprintf(buf, "%s\n", drive->id->model);
}

static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	ide_drive_t *drive = to_ide_device(dev);
	return sprintf(buf, "%s\n", drive->id->fw_rev);
}

static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	ide_drive_t *drive = to_ide_device(dev);
	return sprintf(buf, "%s\n", drive->id->serial_no);
}

static struct device_attribute ide_dev_attrs[] = {
	__ATTR_RO(media),
	__ATTR_RO(drivename),
	__ATTR_RO(modalias),
	__ATTR_RO(model),
	__ATTR_RO(firmware),
	__ATTR(serial, 0400, serial_show, NULL),
	__ATTR_NULL
};

static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	ide_drive_t *drive = to_ide_device(dev);

	add_uevent_var(env, "MEDIA=%s", media_string(drive));
	add_uevent_var(env, "DRIVENAME=%s", drive->name);
	add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
	return 0;
}

static int generic_ide_probe(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	ide_driver_t *drv = to_ide_driver(dev->driver);

	return drv->probe ? drv->probe(drive) : -ENODEV;
}

static int generic_ide_remove(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	ide_driver_t *drv = to_ide_driver(dev->driver);

	if (drv->remove)
		drv->remove(drive);

	return 0;
}

static void generic_ide_shutdown(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	ide_driver_t *drv = to_ide_driver(dev->driver);

	if (dev->driver && drv->shutdown)
		drv->shutdown(drive);
}

struct bus_type ide_bus_type = {
	.name		= "ide",
	.match		= ide_bus_match,
	.uevent		= ide_uevent,
	.probe		= generic_ide_probe,
	.remove		= generic_ide_remove,
	.shutdown	= generic_ide_shutdown,
	.dev_attrs	= ide_dev_attrs,
	.suspend	= generic_ide_suspend,
	.resume		= generic_ide_resume,
};

EXPORT_SYMBOL_GPL(ide_bus_type);

int ide_vlb_clk;
EXPORT_SYMBOL_GPL(ide_vlb_clk);

module_param_named(vlb_clock, ide_vlb_clk, int, 0);
MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");

int ide_pci_clk;
EXPORT_SYMBOL_GPL(ide_pci_clk);

module_param_named(pci_clock, ide_pci_clk, int, 0);
MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");

static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
{
	int a, b, i, j = 1;
	unsigned int *dev_param_mask = (unsigned int *)kp->arg;

	if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
	    sscanf(s, "%d.%d", &a, &b) != 2)
		return -EINVAL;

	i = a * MAX_DRIVES + b;

	if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
		return -EINVAL;

	if (j)
		*dev_param_mask |= (1 << i);
	else
		*dev_param_mask &= (1 << i);

	return 0;
}

static unsigned int ide_nodma;

module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
MODULE_PARM_DESC(nodma, "disallow DMA for a device");

static unsigned int ide_noflush;

module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
MODULE_PARM_DESC(noflush, "disable flush requests for a device");

static unsigned int ide_noprobe;

module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
MODULE_PARM_DESC(noprobe, "skip probing for a device");

static unsigned int ide_nowerr;

module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");

static unsigned int ide_cdroms;

module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");

struct chs_geom {
	unsigned int	cyl;
	u8		head;
	u8		sect;
};

static unsigned int ide_disks;
static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];

static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
{
	int a, b, c = 0, h = 0, s = 0, i, j = 1;

	if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
	    sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
		return -EINVAL;

	i = a * MAX_DRIVES + b;

	if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
		return -EINVAL;

	if (c > INT_MAX || h > 255 || s > 255)
		return -EINVAL;

	if (j)
		ide_disks |= (1 << i);
	else
		ide_disks &= (1 << i);

	ide_disks_chs[i].cyl  = c;
	ide_disks_chs[i].head = h;
	ide_disks_chs[i].sect = s;

	return 0;
}

module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");

static void ide_dev_apply_params(ide_drive_t *drive)
{
	int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;

	if (ide_nodma & (1 << i)) {
		printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
		drive->nodma = 1;
	}
	if (ide_noflush & (1 << i)) {
		printk(KERN_INFO "ide: disabling flush requests for %s\n",
				 drive->name);
		drive->noflush = 1;
	}
	if (ide_noprobe & (1 << i)) {
		printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
		drive->noprobe = 1;
	}
	if (ide_nowerr & (1 << i)) {
		printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
				 drive->name);
		drive->bad_wstat = BAD_R_STAT;
	}
	if (ide_cdroms & (1 << i)) {
		printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
		drive->present = 1;
		drive->media = ide_cdrom;
		/* an ATAPI device ignores DRDY */
		drive->ready_stat = 0;
	}
	if (ide_disks & (1 << i)) {
		drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
		drive->head = drive->bios_head = ide_disks_chs[i].head;
		drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
		drive->forced_geom = 1;
		printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
				 drive->name,
				 drive->cyl, drive->head, drive->sect);
		drive->present = 1;
		drive->media = ide_disk;
		drive->ready_stat = READY_STAT;
	}
}

static unsigned int ide_ignore_cable;

static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
{
	int i, j = 1;

	if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
		return -EINVAL;

	if (i >= MAX_HWIFS || j < 0 || j > 1)
		return -EINVAL;

	if (j)
		ide_ignore_cable |= (1 << i);
	else
		ide_ignore_cable &= (1 << i);

	return 0;
}

module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
MODULE_PARM_DESC(ignore_cable, "ignore cable detection");

void ide_port_apply_params(ide_hwif_t *hwif)
{
	int i;

	if (ide_ignore_cable & (1 << hwif->index)) {
		printk(KERN_INFO "ide: ignoring cable detection for %s\n",
				 hwif->name);
		hwif->cbl = ATA_CBL_PATA40_SHORT;
	}

	for (i = 0; i < MAX_DRIVES; i++)
		ide_dev_apply_params(&hwif->drives[i]);
}

/*
 * This is gets invoked once during initialization, to set *everything* up
 */
static int __init ide_init(void)
{
	int ret;

	printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");

	ret = bus_register(&ide_bus_type);
	if (ret < 0) {
		printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
		return ret;
	}

	ide_port_class = class_create(THIS_MODULE, "ide_port");
	if (IS_ERR(ide_port_class)) {
		ret = PTR_ERR(ide_port_class);
		goto out_port_class;
	}

	proc_ide_create();

	return 0;

out_port_class:
	bus_unregister(&ide_bus_type);

	return ret;
}

static void __exit ide_exit(void)
{
	proc_ide_destroy();

	class_destroy(ide_port_class);

	bus_unregister(&ide_bus_type);
}

module_init(ide_init);
module_exit(ide_exit);

MODULE_LICENSE("GPL");