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/*
* Access ACPI _OSC method
*
* Copyright (C) 2006 Intel Corp.
* Tom Long Nguyen (tom.l.nguyen@intel.com)
* Zhang Yanmin (yanmin.zhang@intel.com)
*
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/suspend.h>
#include <linux/acpi.h>
#include <linux/pci-acpi.h>
#include <linux/delay.h>
#include "aerdrv.h"
/**
* aer_osc_setup - run ACPI _OSC method
*
* Return:
* Zero if success. Nonzero for otherwise.
*
* Invoked when PCIE bus loads AER service driver. To avoid conflict with
* BIOS AER support requires BIOS to yield AER control to OS native driver.
**/
int aer_osc_setup(struct pci_dev *dev)
{
int retval = OSC_METHOD_RUN_SUCCESS;
acpi_status status;
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
struct pci_dev *pdev = dev;
struct pci_bus *parent;
while (!handle) {
if (!pdev || !pdev->bus->parent)
break;
parent = pdev->bus->parent;
if (!parent->self)
/* Parent must be a host bridge */
handle = acpi_get_pci_rootbridge_handle(
pci_domain_nr(parent),
parent->number);
else
handle = DEVICE_ACPI_HANDLE(
&(parent->self->dev));
pdev = parent->self;
}
if (!handle)
return OSC_METHOD_NOT_SUPPORTED;
pci_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);
status = pci_osc_control_set(handle, OSC_PCI_EXPRESS_AER_CONTROL |
OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
if (ACPI_FAILURE(status)) {
if (status == AE_SUPPORT)
retval = OSC_METHOD_NOT_SUPPORTED;
else
retval = OSC_METHOD_RUN_FAILURE;
}
return retval;
}
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