1/*
2 * Access ACPI _OSC method
3 *
4 * Copyright (C) 2006 Intel Corp.
5 *	Tom Long Nguyen (tom.l.nguyen@intel.com)
6 *	Zhang Yanmin (yanmin.zhang@intel.com)
7 *
8 */
9
10#include <linux/module.h>
11#include <linux/pci.h>
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/pm.h>
15#include <linux/suspend.h>
16#include <linux/acpi.h>
17#include <linux/pci-acpi.h>
18#include <linux/delay.h>
19#include "aerdrv.h"
20
21/**
22 * aer_osc_setup - run ACPI _OSC method
23 *
24 * Return:
25 *	Zero if success. Nonzero for otherwise.
26 *
27 * Invoked when PCIE bus loads AER service driver. To avoid conflict with
28 * BIOS AER support requires BIOS to yield AER control to OS native driver.
29 **/
30int aer_osc_setup(struct pci_dev *dev)
31{
32	int retval = OSC_METHOD_RUN_SUCCESS;
33	acpi_status status;
34	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
35	struct pci_dev *pdev = dev;
36	struct pci_bus *parent;
37
38	while (!handle) {
39		if (!pdev || !pdev->bus->parent)
40			break;
41		parent = pdev->bus->parent;
42		if (!parent->self)
43			/* Parent must be a host bridge */
44			handle = acpi_get_pci_rootbridge_handle(
45					pci_domain_nr(parent),
46					parent->number);
47		else
48			handle = DEVICE_ACPI_HANDLE(
49					&(parent->self->dev));
50		pdev = parent->self;
51	}
52
53	if (!handle)
54		return OSC_METHOD_NOT_SUPPORTED;
55
56	pci_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);
57	status = pci_osc_control_set(handle, OSC_PCI_EXPRESS_AER_CONTROL |
58		OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
59	if (ACPI_FAILURE(status)) {
60		if (status == AE_SUPPORT)
61			retval = OSC_METHOD_NOT_SUPPORTED;
62	 	else
63			retval = OSC_METHOD_RUN_FAILURE;
64	}
65
66	return retval;
67}
68