[PATCH 4/5] SATA/ACPI functions

[Randy Dunlap <randy_d_dunlap@linux.intel.com>]

From: Randy Dunlap <randy_d_dunlap@linux.intel.com>

Add support for ACPI methods to SATA suspend/resume.
Add calls to ACPI methods for SATA drives.

Signed-off-by: Randy Dunlap <randy_d_dunlap@linux.intel.com>
 drivers/scsi/libata-acpi.c |  580 +++++++++++++++++++++++++++++++++++++++++++++
 drivers/scsi/libata-core.c |    5 
 drivers/scsi/libata.h      |   32 ++
 3 files changed, 617 insertions(+)

--- /dev/null
+++ linux-2615-rc7-sat/drivers/scsi/libata-acpi.c
@@ -0,0 +1,580 @@
+/*
+ * libata-acpi.c
+ * Provides ACPI support for PATA/SATA.
+ *
+ * Copyright (C) 2005 Intel Corp.
+ * Copyright (C) 2005 Randy Dunlap
+ */
+
+#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 "scsi.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 */
+};
+
+/**
+ * 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
+ * IDE and SCSI 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;
+
+	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;
+}
+
+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_SUCCESS(status)) {
+		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))
+				printk(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))
+				printk(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))
+					printk(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))
+					printk(KERN_DEBUG
+						"THIS ^^^^^ is the requested SATA drive (handle = 0x%p)\n",
+						handle);
+				winfo->sata_adr = dinfo->address;
+				winfo->obj_handle = handle;
+			}
+		}
+out:
+		acpi_os_free(dinfo);
+	}
+	acpi_os_free(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))
+			printk(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))
+			printk(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;
+}
+
+/**
+ * ata_acpi_push_id - send Identify data to a drive
+ * @ap: the ata_port for the drive
+ * @ix: drive index
+ *
+ * Must be after Identify (Packet) Device -- uses its data.
+ */
+int ata_acpi_push_id(struct ata_port *ap, unsigned int ix)
+{
+	acpi_handle			handle;
+	acpi_integer			pcidevfn;
+	int				err = -ENODEV;
+	struct device			*dev = ap->host_set->dev;
+	struct ata_device		*atadev = &ap->device[ix];
+	u32				dev_adr;
+	acpi_status			status;
+	struct acpi_object_list		input;
+	union acpi_object 		in_params[1];
+
+	if (ata_msg_probe(ap))
+		printk(KERN_DEBUG
+			"%s: ap->id: %d, ix = %d, port#: %d, hard_port#: %d\n",
+			__FUNCTION__, ap->id, ix,
+			ap->port_no, ap->hard_port_no);
+
+	/* Don't continue if not a SATA device. */
+	if (!ata_id_is_sata(atadev->id)) {
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG "%s: ata_id_is_sata is False\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(dev, &handle, &pcidevfn);
+	if (err < 0) {
+		if (ata_msg_probe(ap))
+			printk(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 (!atadev->obj_handle) {
+		dev_adr = SATA_ADR_RSVD;
+		err = get_sata_adr(dev, handle, pcidevfn, ix, ap, atadev,
+				&dev_adr);
+		if (err < 0 || dev_adr == SATA_ADR_RSVD ||
+		    !atadev->obj_handle) {
+			if (ata_msg_probe(ap))
+				printk(KERN_DEBUG "%s: get_sata_adr failed: "
+					"err=%d, dev_adr=%u, obj_handle=0x%p\n",
+					__FUNCTION__, err, dev_adr,
+					atadev->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(atadev->id);
+	in_params[0].buffer.pointer = (u8 *)atadev->id;
+	/* Output buffer: _SDD has no output */
+
+	/* It's OK for _SDD to be missing too. */
+	swap_buf_le16(atadev->id, ATA_ID_WORDS);
+	status = acpi_evaluate_object(atadev->obj_handle, "_SDD", &input, NULL);
+	swap_buf_le16(atadev->id, ATA_ID_WORDS);
+
+	err = ACPI_FAILURE(status) ? -EIO : 0;
+	if (err < 0) {
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG
+				"ata%u(%u): %s _SDD error: status = 0x%x\n",
+				ap->id, ap->device->devno,
+				__FUNCTION__, status);
+	}
+out:
+	return err;
+}
+EXPORT_SYMBOL_GPL(ata_acpi_push_id);
+
+/**
+ * do_drive_get_GTF - get the drive bootup default taskfile settings
+ * @ap: the ata_port for the drive
+ * @atadev: 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.
+ */
+int do_drive_get_GTF(struct ata_port *ap, struct ata_device *atadev,
+			unsigned int *gtf_length, unsigned long *gtf_address)
+{
+	acpi_status			status;
+	acpi_handle			handle;
+	acpi_integer			pcidevfn;
+	u32				dev_adr;
+	struct acpi_buffer		output;
+	union acpi_object 		*out_obj;
+	struct device			*dev = ap->host_set->dev;
+	int				err = -ENODEV;
+
+	if (ata_msg_probe(ap))
+		printk(KERN_DEBUG
+			"%s: ENTER: ap->id: %d, port#: %d, hard_port#: %d\n",
+			__FUNCTION__, ap->id,
+			ap->port_no, ap->hard_port_no);
+
+	if (!ata_dev_present(atadev) ||
+	    (ap->flags & ATA_FLAG_PORT_DISABLED)) {
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG "%s: ERR: "
+				"ata_dev_present: %d, PORT_DISABLED: %lu\n",
+				__FUNCTION__, ata_dev_present(atadev),
+				ap->flags & ATA_FLAG_PORT_DISABLED);
+		goto out;
+	}
+
+	/* Don't continue if device has no _ADR method.
+	 * _GTF is intended for known motherboard devices. */
+	err = sata_get_dev_handle(dev, &handle, &pcidevfn);
+	if (err < 0) {
+		if (ata_msg_probe(ap))
+			printk(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 (!atadev->obj_handle) {
+		dev_adr = SATA_ADR_RSVD;
+		err = get_sata_adr(dev, handle, pcidevfn, 0, ap, atadev,
+				&dev_adr);
+		if (err < 0 || dev_adr == SATA_ADR_RSVD ||
+		    !atadev->obj_handle) {
+			if (ata_msg_probe(ap))
+				printk(KERN_DEBUG "%s: get_sata_adr failed: "
+					"err=%d, dev_adr=%u, obj_handle=0x%p\n",
+					__FUNCTION__, err, dev_adr,
+					atadev->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(atadev->obj_handle, "_GTF",
+					NULL, &output);
+	if (ACPI_FAILURE(status)) {
+		printk(KERN_DEBUG
+			"%s: Run _GTF error: status = 0x%x\n",
+			__FUNCTION__, status);
+		goto out;
+	}
+
+	if (!output.length || !output.pointer) {
+		printk(KERN_DEBUG
+			"%s: Run _GTF: length or ptr is NULL (0x%llx, 0x%p)\n",
+			__FUNCTION__,
+			(unsigned long long)output.length, output.pointer);
+		acpi_os_free(output.pointer);
+		goto out;
+	}
+
+	out_obj = output.pointer;
+	if (out_obj->type != ACPI_TYPE_BUFFER) {
+		acpi_os_free(output.pointer);
+		printk(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;
+	}
+
+	*gtf_length = out_obj->buffer.length;
+	*gtf_address = (unsigned long)out_obj->buffer.pointer;
+	err = 0;
+out:
+	return err;
+}
+EXPORT_SYMBOL_GPL(do_drive_get_GTF);
+
+/**
+ * taskfile_load_raw - send taskfile registers to host controller
+ * @ap: Port to which output is sent
+ * @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_port *ap,
+				struct ata_device *atadev,
+				const struct taskfile_array *gtf)
+{
+	if (ata_msg_probe(ap))
+		printk(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 (ap->ops->qc_issue && ap->ops->qc_prep) {
+		int ret;
+		struct ata_queued_cmd *qc;
+		unsigned long flags;
+		DECLARE_COMPLETION(wait);
+
+		qc = ata_qc_new_init(ap, atadev);
+		if (!qc) {
+			printk(KERN_DEBUG "%s: ata_qc_new_init ret. NULL\n",
+				__FUNCTION__);
+			return;
+		}
+
+		/* convert gtf to qc.tf */
+		qc->tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */
+		qc->tf.protocol = ATA_PROT_NODATA; /* or ATA_PROT_ATAPI_NODATA */
+		qc->tf.feature = gtf->tfa[0];	/* 0x1f1 */
+		qc->tf.nsect   = gtf->tfa[1];	/* 0x1f2 */
+		qc->tf.lbal    = gtf->tfa[2];	/* 0x1f3 */
+		qc->tf.lbam    = gtf->tfa[3];	/* 0x1f4 */
+		qc->tf.lbah    = gtf->tfa[4];	/* 0x1f5 */
+		qc->tf.device  = gtf->tfa[5];	/* 0x1f6 */
+		qc->tf.command = gtf->tfa[6];	/* 0x1f7 */
+
+		qc->waiting = &wait;
+		qc->complete_fn = ata_qc_complete_noop;
+
+		// TBD: fix locking and return value/wait_for_completion here:
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG "call ata_qc_issue:\n");
+		spin_lock_irqsave(&ap->host_set->lock, flags);
+		ret = ata_qc_issue(qc);
+		spin_unlock_irqrestore(&ap->host_set->lock, flags);
+		if (ata_msg_probe(ap))
+			printk(KERN_DEBUG "%s: ata_qc_issue done: ret = 0x%x\n",
+				__FUNCTION__, ret);
+
+		if (!ret)
+			wait_for_completion(&wait);
+		/* TBD: some commands may need a delay period afterward? */
+	} else
+		if (ata_msg_warn(ap))
+			printk(KERN_WARNING
+				"%s: SATA driver is missing qc_issue/qc_prep function entry points\n",
+				__FUNCTION__);
+}
+
+/**
+ * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
+ * @ap: the ata_port for the drive
+ * @atadev: 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.
+ */
+int do_drive_set_taskfiles(struct ata_port *ap, struct ata_device *atadev,
+			unsigned int gtf_length, unsigned long gtf_address)
+{
+	int				err = -ENODEV;
+	int				gtf_count =
+					gtf_length / REGS_PER_GTF;
+	int				ix;
+	struct taskfile_array		*gtf;
+
+	if (ata_msg_probe(ap))
+		printk(KERN_DEBUG
+			"%s: ENTER: ap->id: %d, port#: %d, hard_port#: %d\n",
+			__FUNCTION__, ap->id,
+			ap->port_no, ap->hard_port_no);
+
+	if (!ata_dev_present(atadev) ||
+	    (ap->flags & ATA_FLAG_PORT_DISABLED))
+		goto out;
+	if (!gtf_count)		/* shouldn't be here */
+		goto out;
+
+	if (ata_msg_probe(ap))
+		printk(KERN_DEBUG
+			"%s: total GTF bytes = %u (0x%x), gtf_count = %d\n",
+			__FUNCTION__, gtf_length, gtf_length, gtf_count);
+	if (gtf_length % REGS_PER_GTF) {
+		if (ata_msg_drv(ap))
+			printk(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(ap, atadev, gtf);
+	}
+
+	err = 0;
+out:
+	return err;
+}
+EXPORT_SYMBOL_GPL(do_drive_set_taskfiles);
+
+/**
+ * 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;
+	unsigned int gtf_length;
+	unsigned long gtf_address;
+
+	if (ata_msg_probe(ap))
+		printk(KERN_DEBUG "%s: ENTER:\n", __FUNCTION__);
+
+	for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
+		printk(KERN_DEBUG "%s: call get_GTF, ix=%d\n",
+			__FUNCTION__, ix);
+		ret = do_drive_get_GTF(ap, &ap->device[ix],
+				&gtf_length, &gtf_address);
+		if (ret < 0) {
+			if (ata_msg_probe(ap))
+				printk(KERN_DEBUG "%s: get_GTF error (%d)\n",
+					__FUNCTION__, ret);
+			break;
+		}
+
+		printk(KERN_DEBUG "%s: call set_taskfiles, ix=%d\n",
+			__FUNCTION__, ix);
+		ret = do_drive_set_taskfiles(ap, &ap->device[ix],
+				gtf_length, gtf_address);
+		acpi_os_free((void *)gtf_address);
+		if (ret < 0) {
+			if (ata_msg_probe(ap))
+				printk(KERN_DEBUG
+					"%s: set_taskfiles error (%d)\n",
+					__FUNCTION__, ret);
+			break;
+		}
+	}
+
+	if (ata_msg_probe(ap))
+		printk(KERN_DEBUG "%s: ret=%d\n", __FUNCTION__, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ata_acpi_exec_tfs);
--- linux-2615-rc7-sat.orig/drivers/scsi/libata-core.c
+++ linux-2615-rc7-sat/drivers/scsi/libata-core.c
@@ -1345,6 +1345,8 @@ void ata_dev_config(struct ata_port *ap,
 
 	if (ap->ops->dev_config)
 		ap->ops->dev_config(ap, &ap->device[i]);
+
+	ata_acpi_push_id(ap, i);
 }
 
 /**
@@ -1385,6 +1387,8 @@ static int ata_bus_probe(struct ata_port
 	if (ap->flags & ATA_FLAG_PORT_DISABLED)
 		goto err_out_disable;
 
+	ata_acpi_exec_tfs(ap);
+
 	return 0;
 
 err_out_disable:
@@ -4172,6 +4176,7 @@ int ata_device_resume(struct ata_port *a
 	}
 	if (!ata_dev_present(dev))
 		return 0;
+	ata_acpi_exec_tfs(ap);
 	if (dev->class == ATA_DEV_ATA)
 		ata_start_drive(ap, dev);
 
--- linux-2615-rc7-sat.orig/drivers/scsi/libata.h
+++ linux-2615-rc7-sat/drivers/scsi/libata.h
@@ -53,6 +53,38 @@ extern int ata_task_ioctl(struct scsi_de
 extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
 
 
+/* libata-acpi.c */
+#ifdef CONFIG_SCSI_SATA_ACPI
+extern int ata_acpi_push_id(struct ata_port *ap, unsigned int ix);
+extern int do_drive_get_GTF(struct ata_port *ap, struct ata_device *atadev,
+			unsigned int *gtf_length, unsigned long *gtf_address);
+extern int do_drive_set_taskfiles(struct ata_port *ap, struct ata_device *atadev,
+			unsigned int gtf_length, unsigned long gtf_address);
+extern int ata_acpi_exec_tfs(struct ata_port *ap);
+#else
+static inline int ata_acpi_push_id(struct ata_port *ap, unsigned int ix)
+{
+	return 0;
+}
+static inline int do_drive_get_GTF(struct ata_port *ap,
+			struct ata_device *atadev,
+			unsigned int *gtf_length, unsigned long *gtf_address)
+{
+	return 0;
+}
+static inline int do_drive_set_taskfiles(struct ata_port *ap,
+			struct ata_device *atadev,
+			unsigned int gtf_length, unsigned long gtf_address)
+{
+	return 0;
+}
+static inline int ata_acpi_exec_tfs(struct ata_port *ap)
+{
+	return 0;
+}
+#endif
+
+
 /* libata-scsi.c */
 extern void ata_scsi_scan_host(struct ata_port *ap);
 extern int ata_scsi_error(struct Scsi_Host *host);


---