aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ide/ide-taskfile.c
blob: 62ebefd6394a0af83b10a188c86e9a12a4d1520a (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
/*
 * linux/drivers/ide/ide-taskfile.c	Version 0.38	March 05, 2003
 *
 *  Copyright (C) 2000-2002	Michael Cornwell <cornwell@acm.org>
 *  Copyright (C) 2000-2002	Andre Hedrick <andre@linux-ide.org>
 *  Copyright (C) 2001-2002	Klaus Smolin
 *					IBM Storage Technology Division
 *  Copyright (C) 2003-2004	Bartlomiej Zolnierkiewicz
 *
 *  The big the bad and the ugly.
 *
 *  Problems to be fixed because of BH interface or the lack therefore.
 *
 *  Fill me in stupid !!!
 *
 *  HOST:
 *	General refers to the Controller and Driver "pair".
 *  DATA HANDLER:
 *	Under the context of Linux it generally refers to an interrupt handler.
 *	However, it correctly describes the 'HOST'
 *  DATA BLOCK:
 *	The amount of data needed to be transfered as predefined in the
 *	setup of the device.
 *  STORAGE ATOMIC:
 *	The 'DATA BLOCK' associated to the 'DATA HANDLER', and can be as
 *	small as a single sector or as large as the entire command block
 *	request.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.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/blkpg.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/bitops.h>

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

static void ata_bswap_data (void *buffer, int wcount)
{
	u16 *p = buffer;

	while (wcount--) {
		*p = *p << 8 | *p >> 8; p++;
		*p = *p << 8 | *p >> 8; p++;
	}
}

static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
	HWIF(drive)->ata_input_data(drive, buffer, wcount);
	if (drive->bswap)
		ata_bswap_data(buffer, wcount);
}

static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
{
	if (drive->bswap) {
		ata_bswap_data(buffer, wcount);
		HWIF(drive)->ata_output_data(drive, buffer, wcount);
		ata_bswap_data(buffer, wcount);
	} else {
		HWIF(drive)->ata_output_data(drive, buffer, wcount);
	}
}

int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
{
	ide_task_t args;
	memset(&args, 0, sizeof(ide_task_t));
	args.tfRegister[IDE_NSECTOR_OFFSET]	= 0x01;
	if (drive->media == ide_disk)
		args.tfRegister[IDE_COMMAND_OFFSET]	= WIN_IDENTIFY;
	else
		args.tfRegister[IDE_COMMAND_OFFSET]	= WIN_PIDENTIFY;
	args.command_type = IDE_DRIVE_TASK_IN;
	args.data_phase   = TASKFILE_IN;
	args.handler	  = &task_in_intr;
	return ide_raw_taskfile(drive, &args, buf);
}

ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
{
	ide_hwif_t *hwif	= HWIF(drive);
	task_struct_t *taskfile	= (task_struct_t *) task->tfRegister;
	hob_struct_t *hobfile	= (hob_struct_t *) task->hobRegister;
	u8 HIHI			= (drive->addressing == 1) ? 0xE0 : 0xEF;

	/* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
	if (IDE_CONTROL_REG) {
		/* clear nIEN */
		hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
	}
	SELECT_MASK(drive, 0);

	if (drive->addressing == 1) {
		hwif->OUTB(hobfile->feature, IDE_FEATURE_REG);
		hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
		hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
		hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
		hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
	}

	hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
	hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
	hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
	hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
	hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);

	hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);

	if (task->handler != NULL) {
		if (task->prehandler != NULL) {
			hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
			ndelay(400);	/* FIXME */
			return task->prehandler(drive, task->rq);
		}
		ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
		return ide_started;
	}

	if (!drive->using_dma)
		return ide_stopped;

	switch (taskfile->command) {
		case WIN_WRITEDMA_ONCE:
		case WIN_WRITEDMA:
		case WIN_WRITEDMA_EXT:
		case WIN_READDMA_ONCE:
		case WIN_READDMA:
		case WIN_READDMA_EXT:
		case WIN_IDENTIFY_DMA:
			if (!hwif->dma_setup(drive)) {
				hwif->dma_exec_cmd(drive, taskfile->command);
				hwif->dma_start(drive);
				return ide_started;
			}
			break;
		default:
			if (task->handler == NULL)
				return ide_stopped;
	}

	return ide_stopped;
}

/*
 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
 */
ide_startstop_t set_multmode_intr (ide_drive_t *drive)
{
	ide_hwif_t *hwif = HWIF(drive);
	u8 stat;

	if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
		drive->mult_count = drive->mult_req;
	} else {
		drive->mult_req = drive->mult_count = 0;
		drive->special.b.recalibrate = 1;
		(void) ide_dump_status(drive, "set_multmode", stat);
	}
	return ide_stopped;
}

/*
 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
 */
ide_startstop_t set_geometry_intr (ide_drive_t *drive)
{
	ide_hwif_t *hwif = HWIF(drive);
	int retries = 5;
	u8 stat;

	while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
		udelay(10);

	if (OK_STAT(stat, READY_STAT, BAD_STAT))
		return ide_stopped;

	if (stat & (ERR_STAT|DRQ_STAT))
		return ide_error(drive, "set_geometry_intr", stat);

	if (HWGROUP(drive)->handler != NULL)
		BUG();
	ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
	return ide_started;
}

/*
 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
 */
ide_startstop_t recal_intr (ide_drive_t *drive)
{
	ide_hwif_t *hwif = HWIF(drive);
	u8 stat;

	if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
		return ide_error(drive, "recal_intr", stat);
	return ide_stopped;
}

/*
 * Handler for commands without a data phase
 */
ide_startstop_t task_no_data_intr (ide_drive_t *drive)
{
	ide_task_t *args	= HWGROUP(drive)->rq->special;
	ide_hwif_t *hwif	= HWIF(drive);
	u8 stat;

	local_irq_enable();
	if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
		return ide_error(drive, "task_no_data_intr", stat);
		/* calls ide_end_drive_cmd */
	}
	if (args)
		ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));

	return ide_stopped;
}

EXPORT_SYMBOL(task_no_data_intr);

static u8 wait_drive_not_busy(ide_drive_t *drive)
{
	ide_hwif_t *hwif = HWIF(drive);
	int retries = 100;
	u8 stat;

	/*
	 * Last sector was transfered, wait until drive is ready.
	 * This can take up to 10 usec, but we will wait max 1 ms
	 * (drive_cmd_intr() waits that long).
	 */
	while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
		udelay(10);

	if (!retries)
		printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);

	return stat;
}

static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
{
	ide_hwif_t *hwif = drive->hwif;
	struct scatterlist *sg = hwif->sg_table;
	struct page *page;
#ifdef CONFIG_HIGHMEM
	unsigned long flags;
#endif
	unsigned int offset;
	u8 *buf;

	page = sg[hwif->cursg].page;
	offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;

	/* get the current page and offset */
	page = nth_page(page, (offset >> PAGE_SHIFT));
	offset %= PAGE_SIZE;

#ifdef CONFIG_HIGHMEM
	local_irq_save(flags);
#endif
	buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;

	hwif->nleft--;
	hwif->cursg_ofs++;

	if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
		hwif->cursg++;
		hwif->cursg_ofs = 0;
	}

	/* do the actual data transfer */
	if (write)
		taskfile_output_data(drive, buf, SECTOR_WORDS);
	else
		taskfile_input_data(drive, buf, SECTOR_WORDS);

	kunmap_atomic(buf, KM_BIO_SRC_IRQ);
#ifdef CONFIG_HIGHMEM
	local_irq_restore(flags);
#endif
}

static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
{
	unsigned int nsect;

	nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
	while (nsect--)
		ide_pio_sector(drive, write);
}

static inline void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
				     unsigned int write)
{
	if (rq->bio)	/* fs request */
		rq->errors = 0;

	switch (drive->hwif->data_phase) {
	case TASKFILE_MULTI_IN:
	case TASKFILE_MULTI_OUT:
		ide_pio_multi(drive, write);
		break;
	default:
		ide_pio_sector(drive, write);
		break;
	}
}

static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
				  const char *s, u8 stat)
{
	if (rq->bio) {
		ide_hwif_t *hwif = drive->hwif;
		int sectors = hwif->nsect - hwif->nleft;

		switch (hwif->data_phase) {
		case TASKFILE_IN:
			if (hwif->nleft)
				break;
			/* fall through */
		case TASKFILE_OUT:
			sectors--;
			break;
		case TASKFILE_MULTI_IN:
			if (hwif->nleft)
				break;
			/* fall through */
		case TASKFILE_MULTI_OUT:
			sectors -= drive->mult_count;
		default:
			break;
		}

		if (sectors > 0) {
			ide_driver_t *drv;

			drv = *(ide_driver_t **)rq->rq_disk->private_data;
			drv->end_request(drive, 1, sectors);
		}
	}
	return ide_error(drive, s, stat);
}

static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
{
	if (rq->flags & REQ_DRIVE_TASKFILE) {
		ide_task_t *task = rq->special;

		if (task->tf_out_flags.all) {
			u8 err = drive->hwif->INB(IDE_ERROR_REG);
			ide_end_drive_cmd(drive, stat, err);
			return;
		}
	}

	ide_end_request(drive, 1, rq->hard_nr_sectors);
}

/*
 * Handler for command with PIO data-in phase (Read/Read Multiple).
 */
ide_startstop_t task_in_intr (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq = HWGROUP(drive)->rq;
	u8 stat = hwif->INB(IDE_STATUS_REG);

	/* new way for dealing with premature shared PCI interrupts */
	if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
		if (stat & (ERR_STAT | DRQ_STAT))
			return task_error(drive, rq, __FUNCTION__, stat);
		/* No data yet, so wait for another IRQ. */
		ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
		return ide_started;
	}

	ide_pio_datablock(drive, rq, 0);

	/* If it was the last datablock check status and finish transfer. */
	if (!hwif->nleft) {
		stat = wait_drive_not_busy(drive);
		if (!OK_STAT(stat, 0, BAD_R_STAT))
			return task_error(drive, rq, __FUNCTION__, stat);
		task_end_request(drive, rq, stat);
		return ide_stopped;
	}

	/* Still data left to transfer. */
	ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);

	return ide_started;
}
EXPORT_SYMBOL(task_in_intr);

/*
 * Handler for command with PIO data-out phase (Write/Write Multiple).
 */
static ide_startstop_t task_out_intr (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq = HWGROUP(drive)->rq;
	u8 stat = hwif->INB(IDE_STATUS_REG);

	if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
		return task_error(drive, rq, __FUNCTION__, stat);

	/* Deal with unexpected ATA data phase. */
	if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
		return task_error(drive, rq, __FUNCTION__, stat);

	if (!hwif->nleft) {
		task_end_request(drive, rq, stat);
		return ide_stopped;
	}

	/* Still data left to transfer. */
	ide_pio_datablock(drive, rq, 1);
	ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);

	return ide_started;
}

ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
{
	ide_startstop_t startstop;

	if (ide_wait_stat(&startstop, drive, DATA_READY,
			  drive->bad_wstat, WAIT_DRQ)) {
		printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
				drive->name,
				drive->hwif->data_phase ? "MULT" : "",
				drive->addressing ? "_EXT" : "");
		return startstop;
	}

	if (!drive->unmask)
		local_irq_disable();

	ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
	ide_pio_datablock(drive, rq, 1);

	return ide_started;
}
EXPORT_SYMBOL(pre_task_out_intr);

static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
{
	struct request rq;

	memset(&rq, 0, sizeof(rq));
	rq.flags = REQ_DRIVE_TASKFILE;
	rq.buffer = buf;

	/*
	 * (ks) We transfer currently only whole sectors.
	 * This is suffient for now.  But, it would be great,
	 * if we would find a solution to transfer any size.
	 * To support special commands like READ LONG.
	 */
	if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
		if (data_size == 0)
			rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
		else
			rq.nr_sectors = data_size / SECTOR_SIZE;

		if (!rq.nr_sectors) {
			printk(KERN_ERR "%s: in/out command without data\n",
					drive->name);
			return -EFAULT;
		}

		rq.hard_nr_sectors = rq.nr_sectors;
		rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;

		if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
			rq.flags |= REQ_RW;
	}

	rq.special = args;
	args->rq = &rq;
	return ide_do_drive_cmd(drive, &rq, ide_wait);
}

int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
{
	return ide_diag_taskfile(drive, args, 0, buf);
}

EXPORT_SYMBOL(ide_raw_taskfile);

int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
{
	ide_task_request_t	*req_task;
	ide_task_t		args;
	u8 *outbuf		= NULL;
	u8 *inbuf		= NULL;
	task_ioreg_t *argsptr	= args.tfRegister;
	task_ioreg_t *hobsptr	= args.hobRegister;
	int err			= 0;
	int tasksize		= sizeof(struct ide_task_request_s);
	int taskin		= 0;
	int taskout		= 0;
	u8 io_32bit		= drive->io_32bit;
	char __user *buf = (char __user *)arg;

//	printk("IDE Taskfile ...\n");

	req_task = kzalloc(tasksize, GFP_KERNEL);
	if (req_task == NULL) return -ENOMEM;
	if (copy_from_user(req_task, buf, tasksize)) {
		kfree(req_task);
		return -EFAULT;
	}

	taskout = (int) req_task->out_size;
	taskin  = (int) req_task->in_size;

	if (taskout) {
		int outtotal = tasksize;
		outbuf = kzalloc(taskout, GFP_KERNEL);
		if (outbuf == NULL) {
			err = -ENOMEM;
			goto abort;
		}
		if (copy_from_user(outbuf, buf + outtotal, taskout)) {
			err = -EFAULT;
			goto abort;
		}
	}

	if (taskin) {
		int intotal = tasksize + taskout;
		inbuf = kzalloc(taskin, GFP_KERNEL);
		if (inbuf == NULL) {
			err = -ENOMEM;
			goto abort;
		}
		if (copy_from_user(inbuf, buf + intotal, taskin)) {
			err = -EFAULT;
			goto abort;
		}
	}

	memset(&args, 0, sizeof(ide_task_t));
	memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
	memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);

	args.tf_in_flags  = req_task->in_flags;
	args.tf_out_flags = req_task->out_flags;
	args.data_phase   = req_task->data_phase;
	args.command_type = req_task->req_cmd;

	drive->io_32bit = 0;
	switch(req_task->data_phase) {
		case TASKFILE_OUT_DMAQ:
		case TASKFILE_OUT_DMA:
			err = ide_diag_taskfile(drive, &args, taskout, outbuf);
			break;
		case TASKFILE_IN_DMAQ:
		case TASKFILE_IN_DMA:
			err = ide_diag_taskfile(drive, &args, taskin, inbuf);
			break;
		case TASKFILE_MULTI_OUT:
			if (!drive->mult_count) {
				/* (hs): give up if multcount is not set */
				printk(KERN_ERR "%s: %s Multimode Write " \
					"multcount is not set\n",
					drive->name, __FUNCTION__);
				err = -EPERM;
				goto abort;
			}
			/* fall through */
		case TASKFILE_OUT:
			args.prehandler = &pre_task_out_intr;
			args.handler = &task_out_intr;
			err = ide_diag_taskfile(drive, &args, taskout, outbuf);
			break;
		case TASKFILE_MULTI_IN:
			if (!drive->mult_count) {
				/* (hs): give up if multcount is not set */
				printk(KERN_ERR "%s: %s Multimode Read failure " \
					"multcount is not set\n",
					drive->name, __FUNCTION__);
				err = -EPERM;
				goto abort;
			}
			/* fall through */
		case TASKFILE_IN:
			args.handler = &task_in_intr;
			err = ide_diag_taskfile(drive, &args, taskin, inbuf);
			break;
		case TASKFILE_NO_DATA:
			args.handler = &task_no_data_intr;
			err = ide_diag_taskfile(drive, &args, 0, NULL);
			break;
		default:
			err = -EFAULT;
			goto abort;
	}

	memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
	memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
	req_task->in_flags  = args.tf_in_flags;
	req_task->out_flags = args.tf_out_flags;

	if (copy_to_user(buf, req_task, tasksize)) {
		err = -EFAULT;
		goto abort;
	}
	if (taskout) {
		int outtotal = tasksize;
		if (copy_to_user(buf + outtotal, outbuf, taskout)) {
			err = -EFAULT;
			goto abort;
		}
	}
	if (taskin) {
		int intotal = tasksize + taskout;
		if (copy_to_user(buf + intotal, inbuf, taskin)) {
			err = -EFAULT;
			goto abort;
		}
	}
abort:
	kfree(req_task);
	kfree(outbuf);
	kfree(inbuf);

//	printk("IDE Taskfile ioctl ended. rc = %i\n", err);

	drive->io_32bit = io_32bit;

	return err;
}

int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
{
	struct request rq;
	u8 buffer[4];

	if (!buf)
		buf = buffer;
	memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
	ide_init_drive_cmd(&rq);
	rq.buffer = buf;
	*buf++ = cmd;
	*buf++ = nsect;
	*buf++ = feature;
	*buf++ = sectors;
	return ide_do_drive_cmd(drive, &rq, ide_wait);
}

/*
 * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 */
int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
{
	int err = 0;
	u8 args[4], *argbuf = args;
	u8 xfer_rate = 0;
	int argsize = 4;
	ide_task_t tfargs;

	if (NULL == (void *) arg) {
		struct request rq;
		ide_init_drive_cmd(&rq);
		return ide_do_drive_cmd(drive, &rq, ide_wait);
	}

	if (copy_from_user(args, (void __user *)arg, 4))
		return -EFAULT;

	memset(&tfargs, 0, sizeof(ide_task_t));
	tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
	tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
	tfargs.tfRegister[IDE_SECTOR_OFFSET]  = args[1];
	tfargs.tfRegister[IDE_LCYL_OFFSET]    = 0x00;
	tfargs.tfRegister[IDE_HCYL_OFFSET]    = 0x00;
	tfargs.tfRegister[IDE_SELECT_OFFSET]  = 0x00;
	tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];

	if (args[3]) {
		argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
		argbuf = kzalloc(argsize, GFP_KERNEL);
		if (argbuf == NULL)
			return -ENOMEM;
	}
	if (set_transfer(drive, &tfargs)) {
		xfer_rate = args[1];
		if (ide_ata66_check(drive, &tfargs))
			goto abort;
	}

	err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);

	if (!err && xfer_rate) {
		/* active-retuning-calls future */
		ide_set_xfer_rate(drive, xfer_rate);
		ide_driveid_update(drive);
	}
abort:
	if (copy_to_user((void __user *)arg, argbuf, argsize))
		err = -EFAULT;
	if (argsize > 4)
		kfree(argbuf);
	return err;
}

static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
{
	struct request rq;

	ide_init_drive_cmd(&rq);
	rq.flags = REQ_DRIVE_TASK;
	rq.buffer = buf;
	return ide_do_drive_cmd(drive, &rq, ide_wait);
}

/*
 * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
 */
int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
{
	void __user *p = (void __user *)arg;
	int err = 0;
	u8 args[7], *argbuf = args;
	int argsize = 7;

	if (copy_from_user(args, p, 7))
		return -EFAULT;
	err = ide_wait_cmd_task(drive, argbuf);
	if (copy_to_user(p, argbuf, argsize))
		err = -EFAULT;
	return err;
}

/*
 * NOTICE: This is additions from IBM to provide a discrete interface,
 * for selective taskregister access operations.  Nice JOB Klaus!!!
 * Glad to be able to work and co-develop this with you and IBM.
 */
ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
{
	ide_hwif_t *hwif	= HWIF(drive);
	task_struct_t *taskfile	= (task_struct_t *) task->tfRegister;
	hob_struct_t *hobfile	= (hob_struct_t *) task->hobRegister;

	if (task->data_phase == TASKFILE_MULTI_IN ||
	    task->data_phase == TASKFILE_MULTI_OUT) {
		if (!drive->mult_count) {
			printk(KERN_ERR "%s: multimode not set!\n", drive->name);
			return ide_stopped;
		}
	}

	/*
	 * (ks) Check taskfile in flags.
	 * If set, then execute as it is defined.
	 * If not set, then define default settings.
	 * The default values are:
	 *	read all taskfile registers (except data)
	 *	read the hob registers (sector, nsector, lcyl, hcyl)
	 */
	if (task->tf_in_flags.all == 0) {
		task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
		if (drive->addressing == 1)
			task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
        }

	/* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
	if (IDE_CONTROL_REG)
		/* clear nIEN */
		hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
	SELECT_MASK(drive, 0);

	if (task->tf_out_flags.b.data) {
		u16 data =  taskfile->data + (hobfile->data << 8);
		hwif->OUTW(data, IDE_DATA_REG);
	}

	/* (ks) send hob registers first */
	if (task->tf_out_flags.b.nsector_hob)
		hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
	if (task->tf_out_flags.b.sector_hob)
		hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
	if (task->tf_out_flags.b.lcyl_hob)
		hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
	if (task->tf_out_flags.b.hcyl_hob)
		hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);

	/* (ks) Send now the standard registers */
	if (task->tf_out_flags.b.error_feature)
		hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
	/* refers to number of sectors to transfer */
	if (task->tf_out_flags.b.nsector)
		hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
	/* refers to sector offset or start sector */
	if (task->tf_out_flags.b.sector)
		hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
	if (task->tf_out_flags.b.lcyl)
		hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
	if (task->tf_out_flags.b.hcyl)
		hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);

        /*
	 * (ks) In the flagged taskfile approch, we will use all specified
	 * registers and the register value will not be changed, except the
	 * select bit (master/slave) in the drive_head register. We must make
	 * sure that the desired drive is selected.
	 */
	hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
	switch(task->data_phase) {

   	        case TASKFILE_OUT_DMAQ:
		case TASKFILE_OUT_DMA:
		case TASKFILE_IN_DMAQ:
		case TASKFILE_IN_DMA:
			hwif->dma_setup(drive);
			hwif->dma_exec_cmd(drive, taskfile->command);
			hwif->dma_start(drive);
			break;

	        default:
 			if (task->handler == NULL)
				return ide_stopped;

			/* Issue the command */
			if (task->prehandler) {
				hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
				ndelay(400);	/* FIXME */
				return task->prehandler(drive, task->rq);
			}
			ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
	}

	return ide_started;
}