ide-acpi.c 16.6 KB
Newer Older
Hannes Reinecke's avatar
Hannes Reinecke committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
/*
 * 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>
18
#include <linux/dmi.h>
Hannes Reinecke's avatar
Hannes Reinecke committed
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

#include <acpi/acpi_bus.h>

#define REGS_PER_GTF		7

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...)	\
49
		printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
Hannes Reinecke's avatar
Hannes Reinecke committed
50 51 52 53
#else
#define DEBPRINT(fmt, args...)	do {} while (0)
#endif	/* DEBUGGING */

54
static int ide_noacpi;
55 56 57
module_param_named(noacpi, ide_noacpi, bool, 0);
MODULE_PARM_DESC(noacpi, "disable IDE ACPI support");

58
static int ide_acpigtf;
59 60 61
module_param_named(acpigtf, ide_acpigtf, bool, 0);
MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support");

62
static int ide_acpionboot;
63 64
module_param_named(acpionboot, ide_acpionboot, bool, 0);
MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot");
Hannes Reinecke's avatar
Hannes Reinecke committed
65

66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
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")
		},
	},
Jeff Garzik's avatar
Jeff Garzik committed
85 86

	{ }	/* terminate list */
87 88
};

89
int ide_acpi_init(void)
90 91 92 93 94
{
	dmi_check_system(ide_acpi_dmi_table);
	return 0;
}

Hannes Reinecke's avatar
Hannes Reinecke committed
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
/**
 * 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;
169
	acpi_handle		uninitialized_var(dev_handle);
Hannes Reinecke's avatar
Hannes Reinecke committed
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
	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;
	int				err = -ENODEV;

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

	if (!drive->acpidata->obj_handle) {
226 227
		DEBPRINT("No ACPI object found for %s\n", drive->name);
		goto out;
Hannes Reinecke's avatar
Hannes Reinecke committed
228 229 230 231 232 233 234 235 236 237 238 239 240
	}

	/* 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",
241
		       __func__, status);
Hannes Reinecke's avatar
Hannes Reinecke committed
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
		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",
267
		       __func__, out_obj->buffer.length,
Hannes Reinecke's avatar
Hannes Reinecke committed
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
		       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;
}

/**
 * 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)
{
297
	int			rc = 0, err;
Hannes Reinecke's avatar
Hannes Reinecke committed
298 299 300 301 302 303
	int			gtf_count = gtf_length / REGS_PER_GTF;
	int			ix;

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

304
	/* send all taskfile registers (0x1f1-0x1f7) *in*that*order* */
Hannes Reinecke's avatar
Hannes Reinecke committed
305
	for (ix = 0; ix < gtf_count; ix++) {
306
		u8 *gtf = (u8 *)(gtf_address + ix * REGS_PER_GTF);
307
		struct ide_cmd cmd;
308 309 310 311 312 313 314 315 316 317 318 319

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

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

		/* convert GTF to taskfile */
320 321
		memset(&cmd, 0, sizeof(cmd));
		memcpy(&cmd.tf_array[7], gtf, REGS_PER_GTF);
322 323
		cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
		cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
324

325
		err = ide_no_data_taskfile(drive, &cmd);
326 327 328
		if (err) {
			printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
					__func__, err);
Hannes Reinecke's avatar
Hannes Reinecke committed
329
			rc = err;
330
		}
Hannes Reinecke's avatar
Hannes Reinecke committed
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
	}

	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
Andrew Morton's avatar
Andrew Morton committed
440 441
			"%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
			"addr (0x%p)\n",
442
			__func__, out_obj->buffer.length,
Andrew Morton's avatar
Andrew Morton committed
443
			sizeof(struct GTM_buffer), out_obj->buffer.pointer);
Hannes Reinecke's avatar
Hannes Reinecke committed
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
		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.
471
 * Unfortunately drive->id is a mangled version which we can't readily
Hannes Reinecke's avatar
Hannes Reinecke committed
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
 * 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;
501
	in_params[1].buffer.length = ATA_ID_WORDS * 2;
Hannes Reinecke's avatar
Hannes Reinecke committed
502 503
	in_params[1].buffer.pointer = (u8 *)&master->idbuff;
	in_params[2].type = ACPI_TYPE_BUFFER;
504
	in_params[2].buffer.length = ATA_ID_WORDS * 2;
Hannes Reinecke's avatar
Hannes Reinecke committed
505 506 507 508 509 510 511 512 513 514 515 516
	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);
}

517 518 519 520 521 522 523 524 525 526
/**
 * 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)
{
527 528
	ide_drive_t *drive;
	int i;
529

530
	if (ide_noacpi || ide_noacpi_psx)
531 532 533 534 535 536 537 538
		return;

	DEBPRINT("ENTER:\n");

	if (!hwif->acpidata) {
		DEBPRINT("no ACPI data for %s\n", hwif->name);
		return;
	}
539

540 541 542 543
	/* 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);

544 545
	ide_port_for_each_present_dev(i, drive, hwif) {
		if (drive->acpidata->obj_handle)
546
			acpi_bus_set_power(drive->acpidata->obj_handle,
547
					   on ? ACPI_STATE_D0 : ACPI_STATE_D3);
548
	}
549

550 551 552 553
	if (!on)
		acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);
}

Hannes Reinecke's avatar
Hannes Reinecke committed
554
/**
555
 * ide_acpi_init_port - initialize the ACPI link for an IDE interface
Hannes Reinecke's avatar
Hannes Reinecke committed
556 557 558 559 560 561 562 563 564
 * @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.
 */
565
void ide_acpi_init_port(ide_hwif_t *hwif)
Hannes Reinecke's avatar
Hannes Reinecke committed
566 567 568 569 570 571 572 573 574 575 576
{
	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;
	}
577 578 579 580 581 582 583 584 585
}

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

	if (hwif->acpidata == NULL)
		return;
Hannes Reinecke's avatar
Hannes Reinecke committed
586 587 588 589 590 591

	/*
	 * The ACPI spec mandates that we send information
	 * for both drives, regardless whether they are connected
	 * or not.
	 */
592 593
	hwif->devices[0]->acpidata = &hwif->acpidata->master;
	hwif->devices[1]->acpidata = &hwif->acpidata->slave;
Hannes Reinecke's avatar
Hannes Reinecke committed
594

595
	/* get _ADR info for each device */
596
	ide_port_for_each_present_dev(i, drive, hwif) {
597 598 599 600 601 602 603 604 605 606 607 608 609 610
		acpi_handle dev_handle;

		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;
	}

611 612
	/* send IDENTIFY for each device */
	ide_port_for_each_present_dev(i, drive, hwif) {
613 614
		err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff);
		if (err)
Hannes Reinecke's avatar
Hannes Reinecke committed
615
			DEBPRINT("identify device %s failed (%d)\n",
616
				 drive->name, err);
Hannes Reinecke's avatar
Hannes Reinecke committed
617 618
	}

619
	if (!ide_acpionboot) {
Hannes Reinecke's avatar
Hannes Reinecke committed
620 621 622 623
		DEBPRINT("ACPI methods disabled on boot\n");
		return;
	}

624 625
	/* ACPI _PS0 before _STM */
	ide_acpi_set_state(hwif, 1);
Hannes Reinecke's avatar
Hannes Reinecke committed
626 627 628 629 630 631
	/*
	 * ACPI requires us to call _STM on startup
	 */
	ide_acpi_get_timing(hwif);
	ide_acpi_push_timing(hwif);

632 633
	ide_port_for_each_present_dev(i, drive, hwif) {
		ide_acpi_exec_tfs(drive);
Hannes Reinecke's avatar
Hannes Reinecke committed
634 635
	}
}