summaryrefslogtreecommitdiffstats
path: root/drivers/ata/libata-acpi.c
blob: 02236739b40f73787dfbd5cb40204117dd44be6f (plain) (blame)
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
/*
 * libata-acpi.c
 * Provides ACPI support for PATA/SATA.
 *
 * Copyright (C) 2006 Intel Corp.
 * Copyright (C) 2006 Randy Dunlap
 */

#include <linux/ata.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/libata.h>
#include <linux/pci.h>
#include "libata.h"

#include <acpi/acpi_bus.h>
#include <acpi/acnames.h>
#include <acpi/acnamesp.h>
#include <acpi/acparser.h>
#include <acpi/acexcep.h>
#include <acpi/acmacros.h>
#include <acpi/actypes.h>

#define SATA_ROOT_PORT(x)	(((x) >> 16) & 0xffff)
#define SATA_PORT_NUMBER(x)	((x) & 0xffff)	/* or NO_PORT_MULT */
#define NO_PORT_MULT		0xffff
#define SATA_ADR_RSVD		0xffffffff

#define REGS_PER_GTF		7
struct taskfile_array {
	u8	tfa[REGS_PER_GTF];	/* regs. 0x1f1 - 0x1f7 */
};

/*
 *	Helper - belongs in the PCI layer somewhere eventually
 */
static int is_pci_dev(struct device *dev)
{
	return (dev->bus == &pci_bus_type);
}

/**
 * sata_get_dev_handle - finds acpi_handle and PCI device.function
 * @dev: device to locate
 * @handle: returned acpi_handle for @dev
 * @pcidevfn: return PCI device.func for @dev
 *
 * This function is somewhat SATA-specific.  Or at least the
 * PATA & SATA versions of this function are different,
 * so it's not entirely generic code.
 *
 * Returns 0 on success, <0 on error.
 */
static int sata_get_dev_handle(struct device *dev, acpi_handle *handle,
					acpi_integer *pcidevfn)
{
	struct pci_dev	*pci_dev;
	acpi_integer	addr;

	if (!is_pci_dev(dev))
		return -ENODEV;

	pci_dev = to_pci_dev(dev);	/* NOTE: PCI-specific */
	/* Please refer to the ACPI spec for the syntax of _ADR. */
	addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
	*pcidevfn = addr;
	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	if (!*handle)
		return -ENODEV;
	return 0;
}

/**
 * pata_get_dev_handle - finds acpi_handle and PCI device.function
 * @dev: device to locate
 * @handle: returned acpi_handle for @dev
 * @pcidevfn: return PCI device.func for @dev
 *
 * The PATA and SATA versions of this function are different.
 *
 * Returns 0 on success, <0 on error.
 */
static int pata_get_dev_handle(struct device *dev, acpi_handle *handle,
				acpi_integer *pcidevfn)
{
	unsigned int bus, devnum, func;
	acpi_integer addr;
	acpi_handle dev_handle, parent_handle;
	struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
					.pointer = NULL};
	acpi_status status;
	struct acpi_device_info	*dinfo = NULL;
	int ret = -ENODEV;
	struct pci_dev *pdev;

	if (!is_pci_dev(dev))
		return -ENODEV;

	pdev = to_pci_dev(dev);

	bus = pdev->bus->number;
	devnum = PCI_SLOT(pdev->devfn);
	func = PCI_FUNC(pdev->devfn);

	dev_handle = DEVICE_ACPI_HANDLE(dev);
	parent_handle = DEVICE_ACPI_HANDLE(dev->parent);

	status = acpi_get_object_info(parent_handle, &buffer);
	if (ACPI_FAILURE(status))
		goto err;

	dinfo = buffer.pointer;
	if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
	    dinfo->address == bus) {
		/* ACPI spec for _ADR for PCI bus: */
		addr = (acpi_integer)(devnum << 16 | func);
		*pcidevfn = addr;
		*handle = dev_handle;
	} else {
		goto err;
	}

	if (!*handle)
		goto err;
	ret = 0;
err:
	kfree(dinfo);
	return ret;
}

struct walk_info {		/* can be trimmed some */
	struct device	*dev;
	struct acpi_device *adev;
	acpi_handle	handle;
	acpi_integer	pcidevfn;
	unsigned int	drivenum;
	acpi_handle	obj_handle;
	struct ata_port *ataport;
	struct ata_device *atadev;
	u32		sata_adr;
	int		status;
	char		basepath[ACPI_PATHNAME_MAX];
	int		basepath_len;
};

static acpi_status get_devices(acpi_handle handle,
				u32 level, void *context, void **return_value)
{
	acpi_status		status;
	struct walk_info	*winfo = context;
	struct acpi_buffer	namebuf = {ACPI_ALLOCATE_BUFFER, NULL};
	char			*pathname;
	struct acpi_buffer	buffer;
	struct acpi_device_info	*dinfo;

	status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &namebuf);
	if (status)
		goto ret;
	pathname = namebuf.pointer;

	buffer.length = ACPI_ALLOCATE_BUFFER;
	buffer.pointer = NULL;
	status = acpi_get_object_info(handle, &buffer);
	if (ACPI_FAILURE(status))
		goto out2;

	dinfo = buffer.pointer;

	/* find full device path name for pcidevfn */
	if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
	    dinfo->address == winfo->pcidevfn) {
		if (ata_msg_probe(winfo->ataport))
			ata_dev_printk(winfo->atadev, KERN_DEBUG,
				":%s: matches pcidevfn (0x%llx)\n",
				pathname, winfo->pcidevfn);
		strlcpy(winfo->basepath, pathname,
			sizeof(winfo->basepath));
		winfo->basepath_len = strlen(pathname);
		goto out;
	}

	/* if basepath is not yet known, ignore this object */
	if (!winfo->basepath_len)
		goto out;

	/* if this object is in scope of basepath, maybe use it */
	if (strncmp(pathname, winfo->basepath,
	    winfo->basepath_len) == 0) {
		if (!(dinfo->valid & ACPI_VALID_ADR))
			goto out;
		if (ata_msg_probe(winfo->ataport))
			ata_dev_printk(winfo->atadev, KERN_DEBUG,
				"GOT ONE: (%s) root_port = 0x%llx,"
				" port_num = 0x%llx\n", pathname,
				SATA_ROOT_PORT(dinfo->address),
				SATA_PORT_NUMBER(dinfo->address));
		/* heuristics: */
		if (SATA_PORT_NUMBER(dinfo->address) != NO_PORT_MULT)
			if (ata_msg_probe(winfo->ataport))
				ata_dev_printk(winfo->atadev,
					KERN_DEBUG, "warning: don't"
					" know how to handle SATA port"
					" multiplier\n");
		if (SATA_ROOT_PORT(dinfo->address) ==
			winfo->ataport->port_no &&
		    SATA_PORT_NUMBER(dinfo->address) == NO_PORT_MULT) {
			if (ata_msg_probe(winfo->ataport))
				ata_dev_printk(winfo->atadev,
					KERN_DEBUG,
					"THIS ^^^^^ is the requested"
					" SATA drive (handle = 0x%p)\n",
					handle);
			winfo->sata_adr = dinfo->address;
			winfo->obj_handle = handle;
		}
	}
out:
	kfree(dinfo);
out2:
	kfree(pathname);

ret:
	return status;
}

/* Get the SATA drive _ADR object. */
static int get_sata_adr(struct device *dev, acpi_handle handle,
			acpi_integer pcidevfn, unsigned int drive,
			struct ata_port *ap,
			struct ata_device *atadev, u32 *dev_adr)
{
	acpi_status	status;
	struct walk_info *winfo;
	int		err = -ENOMEM;

	winfo = kzalloc(sizeof(struct walk_info), GFP_KERNEL);
	if (!winfo)
		goto out;

	winfo->dev = dev;
	winfo->atadev = atadev;
	winfo->ataport = ap;
	if (acpi_bus_get_device(handle, &winfo->adev) < 0)
		if (ata_msg_probe(ap))
			ata_dev_printk(winfo->atadev, KERN_DEBUG,
				"acpi_bus_get_device failed\n");
	winfo->handle = handle;
	winfo->pcidevfn = pcidevfn;
	winfo->drivenum = drive;

	status = acpi_get_devices(NULL, get_devices, winfo, NULL);
	if (ACPI_FAILURE(status)) {
		if (ata_msg_probe(ap))
			ata_dev_printk(winfo->atadev, KERN_DEBUG,
				"%s: acpi_get_devices failed\n",
				__FUNCTION__);
		err = -ENODEV;
	} else {
		*dev_adr = winfo->sata_adr;
		atadev->obj_handle = winfo->obj_handle;
		err = 0;
	}
	kfree(winfo);
out:
	return err;
}

/**
 * do_drive_get_GTF - get the drive bootup default taskfile settings
 * @dev: target ATA device
 * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 * @gtf_address: buffer containing _GTF taskfile arrays
 *
 * This applies to both PATA and SATA drives.
 *
 * The _GTF method has no input parameters.
 * It returns a variable number of register set values (registers
 * hex 1F1..1F7, taskfiles).
 * The <variable number> is not known in advance, so have ACPI-CA
 * allocate the buffer as needed and return it, then free it later.
 *
 * The returned @gtf_length and @gtf_address are only valid if the
 * function return value is 0.
 */
static int do_drive_get_GTF(struct ata_device *dev, unsigned int *gtf_length,
			    unsigned long *gtf_address, unsigned long *obj_loc)
{
	struct ata_port *ap = dev->ap;
	acpi_status status;
	acpi_handle dev_handle = NULL;
	acpi_handle chan_handle, drive_handle;
	acpi_integer pcidevfn = 0;
	u32 dev_adr;
	struct acpi_buffer output;
	union acpi_object *out_obj;
	struct device *gdev = ap->host->dev;
	int err = -ENODEV;

	*gtf_length = 0;
	*gtf_address = 0UL;
	*obj_loc = 0UL;

	if (libata_noacpi)
		return 0;

	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
			       __FUNCTION__, ap->port_no);

	if (!ata_dev_enabled(dev) || (ap->flags & ATA_FLAG_DISABLED)) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG, "%s: ERR: "
				"ata_dev_present: %d, PORT_DISABLED: %lu\n",
				__FUNCTION__, ata_dev_enabled(dev),
				ap->flags & ATA_FLAG_DISABLED);
		goto out;
	}

	/* Don't continue if device has no _ADR method.
	 * _GTF is intended for known motherboard devices. */
	if (!(ap->flags & ATA_FLAG_ACPI_SATA)) {
		err = pata_get_dev_handle(gdev, &dev_handle, &pcidevfn);
		if (err < 0) {
			if (ata_msg_probe(ap))
				ata_dev_printk(dev, KERN_DEBUG,
					"%s: pata_get_dev_handle failed (%d)\n",
					__FUNCTION__, err);
			goto out;
		}
	} else {
		err = sata_get_dev_handle(gdev, &dev_handle, &pcidevfn);
		if (err < 0) {
			if (ata_msg_probe(ap))
				ata_dev_printk(dev, KERN_DEBUG,
					"%s: sata_get_dev_handle failed (%d\n",
					__FUNCTION__, err);
			goto out;
		}
	}

	/* Get this drive's _ADR info. if not already known. */
	if (!dev->obj_handle) {
		if (!(ap->flags & ATA_FLAG_ACPI_SATA)) {
			/* get child objects of dev_handle == channel objects,
	 		 * + _their_ children == drive objects */
			/* channel is ap->port_no */
			chan_handle = acpi_get_child(dev_handle,
						ap->port_no);
			if (ata_msg_probe(ap))
				ata_dev_printk(dev, KERN_DEBUG,
					"%s: chan adr=%d: chan_handle=0x%p\n",
					__FUNCTION__, ap->port_no,
					chan_handle);
			if (!chan_handle) {
				err = -ENODEV;
				goto out;
			}
			/* TBD: could also check ACPI object VALID bits */
			drive_handle = acpi_get_child(chan_handle, dev->devno);
			if (!drive_handle) {
				err = -ENODEV;
				goto out;
			}
			dev_adr = dev->devno;
			dev->obj_handle = drive_handle;
		} else {	/* for SATA mode */
			dev_adr = SATA_ADR_RSVD;
			err = get_sata_adr(gdev, dev_handle, pcidevfn, 0,
					ap, dev, &dev_adr);
		}
		if (err < 0 || dev_adr == SATA_ADR_RSVD ||
		    !dev->obj_handle) {
			if (ata_msg_probe(ap))
				ata_dev_printk(dev, KERN_DEBUG,
					"%s: get_sata/pata_adr failed: "
					"err=%d, dev_adr=%u, obj_handle=0x%p\n",
					__FUNCTION__, err, dev_adr,
					dev->obj_handle);
			goto out;
		}
	}

	/* Setting up output buffer */
	output.length = ACPI_ALLOCATE_BUFFER;
	output.pointer = NULL;	/* ACPI-CA sets this; save/free it later */

	/* _GTF has no input parameters */
	err = -EIO;
	status = acpi_evaluate_object(dev->obj_handle, "_GTF",
					NULL, &output);
	if (ACPI_FAILURE(status)) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG,
				"%s: Run _GTF error: status = 0x%x\n",
				__FUNCTION__, status);
		goto out;
	}

	if (!output.length || !output.pointer) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
				"length or ptr is NULL (0x%llx, 0x%p)\n",
				__FUNCTION__,
				(unsigned long long)output.length,
				output.pointer);
		kfree(output.pointer);
		goto out;
	}

	out_obj = output.pointer;
	if (out_obj->type != ACPI_TYPE_BUFFER) {
		kfree(output.pointer);
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
				"error: expected object type of "
				" ACPI_TYPE_BUFFER, got 0x%x\n",
				__FUNCTION__, out_obj->type);
		err = -ENOENT;
		goto out;
	}

	if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
	    out_obj->buffer.length % REGS_PER_GTF) {
		if (ata_msg_drv(ap))
			ata_dev_printk(dev, KERN_ERR,
				"%s: unexpected GTF length (%d) or addr (0x%p)\n",
				__FUNCTION__, out_obj->buffer.length,
				out_obj->buffer.pointer);
		err = -ENOENT;
		goto out;
	}

	*gtf_length = out_obj->buffer.length;
	*gtf_address = (unsigned long)out_obj->buffer.pointer;
	*obj_loc = (unsigned long)out_obj;
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: returning "
			"gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
			__FUNCTION__, *gtf_length, *gtf_address, *obj_loc);
	err = 0;
out:
	return err;
}

/**
 * taskfile_load_raw - send taskfile registers to host controller
 * @dev: target ATA device
 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 *
 * Outputs ATA taskfile to standard ATA host controller using MMIO
 * or PIO as indicated by the ATA_FLAG_MMIO flag.
 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
 * hob_lbal, hob_lbam, and hob_lbah.
 *
 * This function waits for idle (!BUSY and !DRQ) after writing
 * registers.  If the control register has a new value, this
 * function also waits for idle after writing control and before
 * writing the remaining registers.
 *
 * LOCKING: TBD:
 * Inherited from caller.
 */
static void taskfile_load_raw(struct ata_device *dev,
			      const struct taskfile_array *gtf)
{
	struct ata_port *ap = dev->ap;
	struct ata_taskfile tf;
	unsigned int err;

	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: (0x1f1-1f7): hex: "
			"%02x %02x %02x %02x %02x %02x %02x\n",
			__FUNCTION__,
			gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
			gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);

	if ((gtf->tfa[0] == 0) && (gtf->tfa[1] == 0) && (gtf->tfa[2] == 0)
	    && (gtf->tfa[3] == 0) && (gtf->tfa[4] == 0) && (gtf->tfa[5] == 0)
	    && (gtf->tfa[6] == 0))
		return;

	ata_tf_init(dev, &tf);

	/* convert gtf to tf */
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */
	tf.protocol = ATA_PROT_NODATA;
	tf.feature = gtf->tfa[0];	/* 0x1f1 */
	tf.nsect   = gtf->tfa[1];	/* 0x1f2 */
	tf.lbal    = gtf->tfa[2];	/* 0x1f3 */
	tf.lbam    = gtf->tfa[3];	/* 0x1f4 */
	tf.lbah    = gtf->tfa[4];	/* 0x1f5 */
	tf.device  = gtf->tfa[5];	/* 0x1f6 */
	tf.command = gtf->tfa[6];	/* 0x1f7 */

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err && ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_ERR,
			"%s: ata_exec_internal failed: %u\n",
			__FUNCTION__, err);
}

/**
 * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 * @dev: target ATA device
 * @gtf_length: total number of bytes of _GTF taskfiles
 * @gtf_address: location of _GTF taskfile arrays
 *
 * This applies to both PATA and SATA drives.
 *
 * Write {gtf_address, length gtf_length} in groups of
 * REGS_PER_GTF bytes.
 */
static int do_drive_set_taskfiles(struct ata_device *dev,
				  unsigned int gtf_length,
				  unsigned long gtf_address)
{
	struct ata_port *ap = dev->ap;
	int err = -ENODEV;
	int gtf_count = gtf_length / REGS_PER_GTF;
	int ix;
	struct taskfile_array	*gtf;

	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
			       __FUNCTION__, ap->port_no);

	if (libata_noacpi || !(ap->flags & ATA_FLAG_ACPI_SATA))
		return 0;

	if (!ata_dev_enabled(dev) || (ap->flags & ATA_FLAG_DISABLED))
		goto out;
	if (!gtf_count)		/* shouldn't be here */
		goto out;

	if (gtf_length % REGS_PER_GTF) {
		if (ata_msg_drv(ap))
			ata_dev_printk(dev, KERN_ERR,
				"%s: unexpected GTF length (%d)\n",
				__FUNCTION__, gtf_length);
		goto out;
	}

	for (ix = 0; ix < gtf_count; ix++) {
		gtf = (struct taskfile_array *)
			(gtf_address + ix * REGS_PER_GTF);

		/* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
		taskfile_load_raw(dev, gtf);
	}

	err = 0;
out:
	return err;
}

/**
 * ata_acpi_exec_tfs - get then write drive taskfile settings
 * @ap: the ata_port for the drive
 *
 * This applies to both PATA and SATA drives.
 */
int ata_acpi_exec_tfs(struct ata_port *ap)
{
	int ix;
	int ret = 0;
	unsigned int gtf_length;
	unsigned long gtf_address;
	unsigned long obj_loc;

	if (libata_noacpi)
		return 0;
	/*
	 * TBD - implement PATA support.  For now,
	 * we should not run GTF on PATA devices since some
	 * PATA require execution of GTM/STM before GTF.
	 */
	if (!(ap->flags & ATA_FLAG_ACPI_SATA))
		return 0;

	for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
		struct ata_device *dev = &ap->device[ix];

		if (!ata_dev_enabled(dev))
			continue;

		ret = do_drive_get_GTF(dev, &gtf_length, &gtf_address,
				       &obj_loc);
		if (ret < 0) {
			if (ata_msg_probe(ap))
				ata_port_printk(ap, KERN_DEBUG,
					"%s: get_GTF error (%d)\n",
					__FUNCTION__, ret);
			break;
		}

		ret = do_drive_set_taskfiles(dev, gtf_length, gtf_address);
		kfree((void *)obj_loc);
		if (ret < 0) {
			if (ata_msg_probe(ap))
				ata_port_printk(ap, KERN_DEBUG,
					"%s: set_taskfiles error (%d)\n",
					__FUNCTION__, ret);
			break;
		}
	}

	return ret;
}

/**
 * ata_acpi_push_id - send Identify data to drive
 * @dev: target ATA device
 *
 * _SDD ACPI object: for SATA mode only
 * Must be after Identify (Packet) Device -- uses its data
 * ATM this function never returns a failure.  It is an optional
 * method and if it fails for whatever reason, we should still
 * just keep going.
 */
int ata_acpi_push_id(struct ata_device *dev)
{
	struct ata_port *ap = dev->ap;
	acpi_handle handle;
	acpi_integer pcidevfn;
	int err;
	struct device *gdev = ap->host->dev;
	u32 dev_adr;
	acpi_status status;
	struct acpi_object_list input;
	union acpi_object in_params[1];

	if (libata_noacpi)
		return 0;

	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
			       __FUNCTION__, dev->devno, ap->port_no);

	/* Don't continue if not a SATA device. */
	if (!(ap->flags & ATA_FLAG_ACPI_SATA)) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG,
				"%s: Not a SATA device\n", __FUNCTION__);
		goto out;
	}

	/* Don't continue if device has no _ADR method.
	 * _SDD is intended for known motherboard devices. */
	err = sata_get_dev_handle(gdev, &handle, &pcidevfn);
	if (err < 0) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG,
				"%s: sata_get_dev_handle failed (%d\n",
				__FUNCTION__, err);
		goto out;
	}

	/* Get this drive's _ADR info, if not already known */
	if (!dev->obj_handle) {
		dev_adr = SATA_ADR_RSVD;
		err = get_sata_adr(gdev, handle, pcidevfn, dev->devno, ap, dev,
					&dev_adr);
		if (err < 0 || dev_adr == SATA_ADR_RSVD ||
			!dev->obj_handle) {
			if (ata_msg_probe(ap))
				ata_dev_printk(dev, KERN_DEBUG,
					"%s: get_sata_adr failed: "
					"err=%d, dev_adr=%u, obj_handle=0x%p\n",
					__FUNCTION__, err, dev_adr,
					dev->obj_handle);
			goto out;
		}
	}

	/* Give the drive Identify data to the drive via the _SDD method */
	/* _SDD: set up input parameters */
	input.count = 1;
	input.pointer = in_params;
	in_params[0].type = ACPI_TYPE_BUFFER;
	in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
	in_params[0].buffer.pointer = (u8 *)dev->id;
	/* Output buffer: _SDD has no output */

	/* It's OK for _SDD to be missing too. */
	swap_buf_le16(dev->id, ATA_ID_WORDS);
	status = acpi_evaluate_object(dev->obj_handle, "_SDD", &input, NULL);
	swap_buf_le16(dev->id, ATA_ID_WORDS);

	err = ACPI_FAILURE(status) ? -EIO : 0;
	if (err < 0) {
		if (ata_msg_probe(ap))
			ata_dev_printk(dev, KERN_DEBUG,
				       "%s _SDD error: status = 0x%x\n",
				       __FUNCTION__, status);
	}

	/* always return success */
out:
	return 0;
}