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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
* @pciedev: pcie_device which AER is being enabled on
*
* @return: Zero on success. Nonzero 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 pcie_device *pciedev)
{
acpi_status status = AE_NOT_FOUND;
struct pci_dev *pdev = pciedev->port;
acpi_handle handle = DEVICE_ACPI_HANDLE(&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) {
pcie_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)) {
printk(KERN_DEBUG "AER service couldn't init device %s - %s\n",
pciedev->device.bus_id,
(status == AE_SUPPORT || status == AE_NOT_FOUND) ?
"no _OSC support" : "Run ACPI _OSC fails");
return -1;
}
return 0;
}
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