drivers/ata/libata-acpi.c - fp2-dev/kernel/msm - Gitiles

 /*
  * 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 NO_PORT_MULT		0xffff
 #define SATA_ADR(root,pmp)	(((root) << 16) | (pmp))

 #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);
 }

 static void ata_acpi_associate_sata_port(struct ata_port *ap)
 {
 	acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);

 	ap->device->acpi_handle = acpi_get_child(ap->host->acpi_handle, adr);
 }

 static void ata_acpi_associate_ide_port(struct ata_port *ap)
 {
 	int max_devices, i;

 	ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
 	if (!ap->acpi_handle)
 		return;

 	max_devices = 1;
 	if (ap->flags & ATA_FLAG_SLAVE_POSS)
 		max_devices++;

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

 		dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
 	}
 }

 /**
  * ata_acpi_associate - associate ATA host with ACPI objects
  * @host: target ATA host
  *
  * Look up ACPI objects associated with @host and initialize
  * acpi_handle fields of @host, its ports and devices accordingly.
  *
  * LOCKING:
  * EH context.
  *
  * RETURNS:
  * 0 on success, -errno on failure.
  */
 void ata_acpi_associate(struct ata_host *host)
 {
 	int i;

 	if (!is_pci_dev(host->dev) || libata_noacpi)
 		return;

 	host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
 	if (!host->acpi_handle)
 		return;

 	for (i = 0; i < host->n_ports; i++) {
 		struct ata_port *ap = host->ports[i];

 		if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
 			ata_acpi_associate_sata_port(ap);
 		else
 			ata_acpi_associate_ide_port(ap);
 	}
 }

 /**
  * 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;
 	struct acpi_buffer output;
 	union acpi_object *out_obj;
 	int err = -ENODEV;

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

 	if (!dev->acpi_handle)
 		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;
 	}

 	/* 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->acpi_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 (!(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;

 	/*
 	 * 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;
 	int err;
 	acpi_status status;
 	struct acpi_object_list input;
 	union acpi_object in_params[1];

 	if (!dev->acpi_handle)
 		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;
 	}

 	/* 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->acpi_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;
 }
	/*
	* 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 NO_PORT_MULT 0xffff
	#define SATA_ADR(root,pmp) (((root) << 16) \| (pmp))

	#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);
	}

	static void ata_acpi_associate_sata_port(struct ata_port *ap)
	{
	acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);

	ap->device->acpi_handle = acpi_get_child(ap->host->acpi_handle, adr);
	}

	static void ata_acpi_associate_ide_port(struct ata_port *ap)
	{
	int max_devices, i;

	ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
	if (!ap->acpi_handle)
	return;

	max_devices = 1;
	if (ap->flags & ATA_FLAG_SLAVE_POSS)
	max_devices++;

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

	dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
	}
	}

	/**
	* ata_acpi_associate - associate ATA host with ACPI objects
	* @host: target ATA host
	*
	* Look up ACPI objects associated with @host and initialize
	* acpi_handle fields of @host, its ports and devices accordingly.
	*
	* LOCKING:
	* EH context.
	*
	* RETURNS:
	* 0 on success, -errno on failure.
	*/
	void ata_acpi_associate(struct ata_host *host)
	{
	int i;

	if (!is_pci_dev(host->dev) \|\| libata_noacpi)
	return;

	host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
	if (!host->acpi_handle)
	return;

	for (i = 0; i < host->n_ports; i++) {
	struct ata_port *ap = host->ports[i];

	if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
	ata_acpi_associate_sata_port(ap);
	else
	ata_acpi_associate_ide_port(ap);
	}
	}

	/**
	* 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;
	struct acpi_buffer output;
	union acpi_object *out_obj;
	int err = -ENODEV;

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

	if (!dev->acpi_handle)
	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;
	}

	/* 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->acpi_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 (!(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) inthatorder */
	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;

	/*
	* 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;
	int err;
	acpi_status status;
	struct acpi_object_list input;
	union acpi_object in_params[1];

	if (!dev->acpi_handle)
	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;
	}

	/* 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->acpi_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;
	}