aboutsummaryrefslogtreecommitdiff
path: root/drivers/ide/ide-acpi.c
blob: a3bebba184255424ba17b49eb8bb4c80d648e93d (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
/*
 * Provides ACPI support for IDE drives.
 *
 * Copyright (C) 2005 Intel Corp.
 * Copyright (C) 2005 Randy Dunlap
 * Copyright (C) 2006 SUSE Linux Products GmbH
 * Copyright (C) 2006 Hannes Reinecke
 */

#include <linux/ata.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <acpi/acpi.h>
#include <linux/ide.h>
#include <linux/pci.h>
#include <linux/dmi.h>

#include <acpi/acpi_bus.h>

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

struct GTM_buffer {
	u32	PIO_speed0;
	u32	DMA_speed0;
	u32	PIO_speed1;
	u32	DMA_speed1;
	u32	GTM_flags;
};

struct ide_acpi_drive_link {
	acpi_handle	 obj_handle;
	u8		 idbuff[512];
};

struct ide_acpi_hwif_link {
	ide_hwif_t			*hwif;
	acpi_handle			 obj_handle;
	struct GTM_buffer		 gtm;
	struct ide_acpi_drive_link	 master;
	struct ide_acpi_drive_link	 slave;
};

#undef DEBUGGING
/* note: adds function name and KERN_DEBUG */
#ifdef DEBUGGING
#define DEBPRINT(fmt, args...)	\
		printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
#else
#define DEBPRINT(fmt, args...)	do {} while (0)
#endif	/* DEBUGGING */

static int ide_noacpi;
module_param_named(noacpi, ide_noacpi, bool, 0);
MODULE_PARM_DESC(noacpi, "disable IDE ACPI support");

static int ide_acpigtf;
module_param_named(acpigtf, ide_acpigtf, bool, 0);
MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support");

static int ide_acpionboot;
module_param_named(acpionboot, ide_acpionboot, bool, 0);
MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot");

static bool ide_noacpi_psx;
static int no_acpi_psx(const struct dmi_system_id *id)
{
	ide_noacpi_psx = true;
	printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
	return 0;
}

static const struct dmi_system_id ide_acpi_dmi_table[] = {
	/* Bug 9673. */
	/* We should check if this is because ACPI NVS isn't save/restored. */
	{
		.callback = no_acpi_psx,
		.ident    = "HP nx9005",
		.matches  = {
			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
			DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
		},
	},

	{ }	/* terminate list */
};

static int ide_acpi_blacklist(void)
{
	static int done;
	if (done)
		return 0;
	done = 1;
	dmi_check_system(ide_acpi_dmi_table);
	return 0;
}

/**
 * ide_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
 *
 * Returns the ACPI object handle to the corresponding PCI device.
 *
 * Returns 0 on success, <0 on error.
 */
static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
			       acpi_integer *pcidevfn)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	unsigned int bus, devnum, func;
	acpi_integer addr;
	acpi_handle dev_handle;
	struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
					.pointer = NULL};
	acpi_status status;
	struct acpi_device_info	*dinfo = NULL;
	int ret = -ENODEV;

	bus = pdev->bus->number;
	devnum = PCI_SLOT(pdev->devfn);
	func = PCI_FUNC(pdev->devfn);
	/* ACPI _ADR encoding for PCI bus: */
	addr = (acpi_integer)(devnum << 16 | func);

	DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func);

	dev_handle = DEVICE_ACPI_HANDLE(dev);
	if (!dev_handle) {
		DEBPRINT("no acpi handle for device\n");
		goto err;
	}

	status = acpi_get_object_info(dev_handle, &buffer);
	if (ACPI_FAILURE(status)) {
		DEBPRINT("get_object_info for device failed\n");
		goto err;
	}
	dinfo = buffer.pointer;
	if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
	    dinfo->address == addr) {
		*pcidevfn = addr;
		*handle = dev_handle;
	} else {
		DEBPRINT("get_object_info for device has wrong "
			" address: %llu, should be %u\n",
			dinfo ? (unsigned long long)dinfo->address : -1ULL,
			(unsigned int)addr);
		goto err;
	}

	DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
		 devnum, func, (unsigned long long)addr, *handle);
	ret = 0;
err:
	kfree(dinfo);
	return ret;
}

/**
 * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif
 * @hwif: device to locate
 *
 * Retrieves the object handle for a given hwif.
 *
 * Returns handle on success, 0 on error.
 */
static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
{
	struct device		*dev = hwif->gendev.parent;
	acpi_handle		uninitialized_var(dev_handle);
	acpi_integer		pcidevfn;
	acpi_handle		chan_handle;
	int			err;

	DEBPRINT("ENTER: device %s\n", hwif->name);

	if (!dev) {
		DEBPRINT("no PCI device for %s\n", hwif->name);
		return NULL;
	}

	err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn);
	if (err < 0) {
		DEBPRINT("ide_get_dev_handle failed (%d)\n", err);
		return NULL;
	}

	/* get child objects of dev_handle == channel objects,
	 * + _their_ children == drive objects */
	/* channel is hwif->channel */
	chan_handle = acpi_get_child(dev_handle, hwif->channel);
	DEBPRINT("chan adr=%d: handle=0x%p\n",
		 hwif->channel, chan_handle);

	return chan_handle;
}

/**
 * do_drive_get_GTF - get the drive bootup default taskfile settings
 * @drive: the drive for which the taskfile settings should be retrieved
 * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 * @gtf_address: buffer containing _GTF taskfile arrays
 *
 * 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(ide_drive_t *drive,
		     unsigned int *gtf_length, unsigned long *gtf_address,
		     unsigned long *obj_loc)
{
	acpi_status			status;
	struct acpi_buffer		output;
	union acpi_object 		*out_obj;
	ide_hwif_t			*hwif = drive->hwif;
	struct device			*dev = hwif->gendev.parent;
	int				err = -ENODEV;
	int				port;

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

	if (ide_noacpi)
		return 0;

	if (!dev) {
		DEBPRINT("no PCI device for %s\n", hwif->name);
		goto out;
	}

	if (!hwif->acpidata) {
		DEBPRINT("no ACPI data for %s\n", hwif->name);
		goto out;
	}

	port = hwif->channel ? drive->dn - 2: drive->dn;

	DEBPRINT("ENTER: %s at %s, port#: %d, hard_port#: %d\n",
		 hwif->name, dev_name(dev), port, hwif->channel);

	if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0) {
		DEBPRINT("%s drive %d:%d not present\n",
			 hwif->name, hwif->channel, port);
		goto out;
	}

	if (!drive->acpidata->obj_handle) {
		DEBPRINT("No ACPI object found for %s\n", drive->name);
		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(drive->acpidata->obj_handle, "_GTF",
				      NULL, &output);
	if (ACPI_FAILURE(status)) {
		printk(KERN_DEBUG
		       "%s: Run _GTF error: status = 0x%x\n",
		       __func__, status);
		goto out;
	}

	if (!output.length || !output.pointer) {
		DEBPRINT("Run _GTF: "
		       "length or ptr is NULL (0x%llx, 0x%p)\n",
		       (unsigned long long)output.length,
		       output.pointer);
		goto out;
	}

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

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

	*gtf_length = out_obj->buffer.length;
	*gtf_address = (unsigned long)out_obj->buffer.pointer;
	*obj_loc = (unsigned long)out_obj;
	DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
		 *gtf_length, *gtf_address, *obj_loc);
	err = 0;
out:
	return err;
}

/**
 * taskfile_load_raw - send taskfile registers to drive
 * @drive: drive to which output is sent
 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 *
 * Outputs IDE taskfile to the drive.
 */
static int taskfile_load_raw(ide_drive_t *drive,
			      const struct taskfile_array *gtf)
{
	ide_task_t args;
	int err = 0;

	DEBPRINT("(0x1f1-1f7): hex: "
	       "%02x %02x %02x %02x %02x %02x %02x\n",
	       gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
	       gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);

	memset(&args, 0, sizeof(ide_task_t));

	/* convert gtf to IDE Taskfile */
	memcpy(&args.tf_array[7], &gtf->tfa, 7);
	args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;

	if (!ide_acpigtf) {
		DEBPRINT("_GTF execution disabled\n");
		return err;
	}

	err = ide_no_data_taskfile(drive, &args);
	if (err)
		printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
		       __func__, err);

	return err;
}

/**
 * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 * @drive: the drive to which the taskfile command should be sent
 * @gtf_length: total number of bytes of _GTF taskfiles
 * @gtf_address: location of _GTF taskfile arrays
 *
 * Write {gtf_address, length gtf_length} in groups of
 * REGS_PER_GTF bytes.
 */
static int do_drive_set_taskfiles(ide_drive_t *drive,
				  unsigned int gtf_length,
				  unsigned long gtf_address)
{
	int			rc = -ENODEV, err;
	int			gtf_count = gtf_length / REGS_PER_GTF;
	int			ix;
	struct taskfile_array	*gtf;

	if (ide_noacpi)
		return 0;

	DEBPRINT("ENTER: %s, hard_port#: %d\n", drive->name, drive->dn);

	if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
		goto out;

	if (!gtf_count)		/* shouldn't be here */
		goto out;

	DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
		 gtf_length, gtf_length, gtf_count, gtf_address);

	if (gtf_length % REGS_PER_GTF) {
		printk(KERN_ERR "%s: unexpected GTF length (%d)\n",
		       __func__, gtf_length);
		goto out;
	}

	rc = 0;
	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* */
		err = taskfile_load_raw(drive, gtf);
		if (err)
			rc = err;
	}

out:
	return rc;
}

/**
 * ide_acpi_exec_tfs - get then write drive taskfile settings
 * @drive: the drive for which the taskfile settings should be
 *         written.
 *
 * According to the ACPI spec this should be called after _STM
 * has been evaluated for the interface. Some ACPI vendors interpret
 * that as a hard requirement and modify the taskfile according
 * to the Identify Drive information passed down with _STM.
 * So one should really make sure to call this only after _STM has
 * been executed.
 */
int ide_acpi_exec_tfs(ide_drive_t *drive)
{
	int		ret;
	unsigned int	gtf_length;
	unsigned long	gtf_address;
	unsigned long	obj_loc;

	if (ide_noacpi)
		return 0;

	DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);

	ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
	if (ret < 0) {
		DEBPRINT("get_GTF error (%d)\n", ret);
		return ret;
	}

	DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);

	ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
	kfree((void *)obj_loc);
	if (ret < 0) {
		DEBPRINT("set_taskfiles error (%d)\n", ret);
	}

	DEBPRINT("ret=%d\n", ret);

	return ret;
}

/**
 * ide_acpi_get_timing - get the channel (controller) timings
 * @hwif: target IDE interface (channel)
 *
 * This function executes the _GTM ACPI method for the target channel.
 *
 */
void ide_acpi_get_timing(ide_hwif_t *hwif)
{
	acpi_status		status;
	struct acpi_buffer	output;
	union acpi_object 	*out_obj;

	if (ide_noacpi)
		return;

	DEBPRINT("ENTER:\n");

	if (!hwif->acpidata) {
		DEBPRINT("no ACPI data for %s\n", hwif->name);
		return;
	}

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

	/* _GTM has no input parameters */
	status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
				      NULL, &output);

	DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
		 status, output.pointer,
		 (unsigned long long)output.length);

	if (ACPI_FAILURE(status)) {
		DEBPRINT("Run _GTM error: status = 0x%x\n", status);
		return;
	}

	if (!output.length || !output.pointer) {
		DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
		       (unsigned long long)output.length,
		       output.pointer);
		kfree(output.pointer);
		return;
	}

	out_obj = output.pointer;
	if (out_obj->type != ACPI_TYPE_BUFFER) {
		kfree(output.pointer);
		DEBPRINT("Run _GTM: error: "
		       "expected object type of ACPI_TYPE_BUFFER, "
		       "got 0x%x\n", out_obj->type);
		return;
	}

	if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
	    out_obj->buffer.length != sizeof(struct GTM_buffer)) {
		kfree(output.pointer);
		printk(KERN_ERR
			"%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
			"addr (0x%p)\n",
			__func__, out_obj->buffer.length,
			sizeof(struct GTM_buffer), out_obj->buffer.pointer);
		return;
	}

	memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
	       sizeof(struct GTM_buffer));

	DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
		 out_obj->buffer.pointer, out_obj->buffer.length,
		 sizeof(struct GTM_buffer));

	DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
		 hwif->acpidata->gtm.PIO_speed0,
		 hwif->acpidata->gtm.DMA_speed0,
		 hwif->acpidata->gtm.PIO_speed1,
		 hwif->acpidata->gtm.DMA_speed1,
		 hwif->acpidata->gtm.GTM_flags);

	kfree(output.pointer);
}

/**
 * ide_acpi_push_timing - set the channel (controller) timings
 * @hwif: target IDE interface (channel)
 *
 * This function executes the _STM ACPI method for the target channel.
 *
 * _STM requires Identify Drive data, which has to passed as an argument.
 * Unfortunately drive->id is a mangled version which we can't readily
 * use; hence we'll get the information afresh.
 */
void ide_acpi_push_timing(ide_hwif_t *hwif)
{
	acpi_status		status;
	struct acpi_object_list	input;
	union acpi_object 	in_params[3];
	struct ide_acpi_drive_link	*master = &hwif->acpidata->master;
	struct ide_acpi_drive_link	*slave = &hwif->acpidata->slave;

	if (ide_noacpi)
		return;

	DEBPRINT("ENTER:\n");

	if (!hwif->acpidata) {
		DEBPRINT("no ACPI data for %s\n", hwif->name);
		return;
	}

	/* Give the GTM buffer + drive Identify data to the channel via the
	 * _STM method: */
	/* setup input parameters buffer for _STM */
	input.count = 3;
	input.pointer = in_params;
	in_params[0].type = ACPI_TYPE_BUFFER;
	in_params[0].buffer.length = sizeof(struct GTM_buffer);
	in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
	in_params[1].type = ACPI_TYPE_BUFFER;
	in_params[1].buffer.length = ATA_ID_WORDS * 2;
	in_params[1].buffer.pointer = (u8 *)&master->idbuff;
	in_params[2].type = ACPI_TYPE_BUFFER;
	in_params[2].buffer.length = ATA_ID_WORDS * 2;
	in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
	/* Output buffer: _STM has no output */

	status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
				      &input, NULL);

	if (ACPI_FAILURE(status)) {
		DEBPRINT("Run _STM error: status = 0x%x\n", status);
	}
	DEBPRINT("_STM status: %d\n", status);
}

/**
 * ide_acpi_set_state - set the channel power state
 * @hwif: target IDE interface
 * @on: state, on/off
 *
 * This function executes the _PS0/_PS3 ACPI method to set the power state.
 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
 */
void ide_acpi_set_state(ide_hwif_t *hwif, int on)
{
	ide_drive_t *drive;
	int i;

	if (ide_noacpi || ide_noacpi_psx)
		return;

	DEBPRINT("ENTER:\n");

	if (!hwif->acpidata) {
		DEBPRINT("no ACPI data for %s\n", hwif->name);
		return;
	}
	/* channel first and then drives for power on and verse versa for power off */
	if (on)
		acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);

	ide_port_for_each_dev(i, drive, hwif) {
		if (drive->acpidata->obj_handle &&
		    (drive->dev_flags & IDE_DFLAG_PRESENT)) {
			acpi_bus_set_power(drive->acpidata->obj_handle,
				on? ACPI_STATE_D0: ACPI_STATE_D3);
		}
	}
	if (!on)
		acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
}

/**
 * ide_acpi_init - initialize the ACPI link for an IDE interface
 * @hwif: target IDE interface (channel)
 *
 * The ACPI spec is not quite clear when the drive identify buffer
 * should be obtained. Calling IDENTIFY DEVICE during shutdown
 * is not the best of ideas as the drive might already being put to
 * sleep. And obviously we can't call it during resume.
 * So we get the information during startup; but this means that
 * any changes during run-time will be lost after resume.
 */
void ide_acpi_init(ide_hwif_t *hwif)
{
	ide_acpi_blacklist();

	hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
	if (!hwif->acpidata)
		return;

	hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
	if (!hwif->acpidata->obj_handle) {
		DEBPRINT("no ACPI object for %s found\n", hwif->name);
		kfree(hwif->acpidata);
		hwif->acpidata = NULL;
	}
}

void ide_acpi_port_init_devices(ide_hwif_t *hwif)
{
	ide_drive_t *drive;
	int i, err;

	if (hwif->acpidata == NULL)
		return;

	/*
	 * The ACPI spec mandates that we send information
	 * for both drives, regardless whether they are connected
	 * or not.
	 */
	hwif->devices[0]->acpidata = &hwif->acpidata->master;
	hwif->devices[1]->acpidata = &hwif->acpidata->slave;

	/* get _ADR info for each device */
	ide_port_for_each_dev(i, drive, hwif) {
		acpi_handle dev_handle;

		if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
			continue;

		DEBPRINT("ENTER: %s at channel#: %d port#: %d\n",
			 drive->name, hwif->channel, drive->dn & 1);

		/* TBD: could also check ACPI object VALID bits */
		dev_handle = acpi_get_child(hwif->acpidata->obj_handle,
					    drive->dn & 1);

		DEBPRINT("drive %s handle 0x%p\n", drive->name, dev_handle);

		drive->acpidata->obj_handle = dev_handle;
	}

	/*
	 * Send IDENTIFY for each drive
	 */
	ide_port_for_each_dev(i, drive, hwif) {
		if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
			continue;

		err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff);
		if (err)
			DEBPRINT("identify device %s failed (%d)\n",
				 drive->name, err);
	}

	if (!ide_acpionboot) {
		DEBPRINT("ACPI methods disabled on boot\n");
		return;
	}

	/* ACPI _PS0 before _STM */
	ide_acpi_set_state(hwif, 1);
	/*
	 * ACPI requires us to call _STM on startup
	 */
	ide_acpi_get_timing(hwif);
	ide_acpi_push_timing(hwif);

	ide_port_for_each_dev(i, drive, hwif) {
		if (drive->dev_flags & IDE_DFLAG_PRESENT)
			/* Execute ACPI startup code */
			ide_acpi_exec_tfs(drive);
	}
}