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