2 * Access ACPI _OSC method
4 * Copyright (C) 2006 Intel Corp.
5 * Tom Long Nguyen (tom.l.nguyen@intel.com)
6 * Zhang Yanmin (yanmin.zhang@intel.com)
10 #include <linux/module.h>
11 #include <linux/pci.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
15 #include <linux/suspend.h>
16 #include <linux/acpi.h>
17 #include <linux/pci-acpi.h>
18 #include <linux/delay.h>
22 * aer_osc_setup - run ACPI _OSC method
23 * @pciedev: pcie_device which AER is being enabled on
25 * @return: Zero on success. Nonzero otherwise.
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.
30 int aer_osc_setup(struct pcie_device *pciedev)
32 acpi_status status = AE_NOT_FOUND;
33 struct pci_dev *pdev = pciedev->port;
34 acpi_handle handle = NULL;
36 if (acpi_pci_disabled)
39 /* Find root host bridge */
40 while (pdev->bus->self)
41 pdev = pdev->bus->self;
42 handle = acpi_get_pci_rootbridge_handle(
43 pci_domain_nr(pdev->bus), pdev->bus->number);
46 pcie_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);
47 status = pci_osc_control_set(handle,
48 OSC_PCI_EXPRESS_AER_CONTROL |
49 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
52 if (ACPI_FAILURE(status)) {
53 dev_printk(KERN_DEBUG, &pciedev->device, "AER service couldn't "
55 (status == AE_SUPPORT || status == AE_NOT_FOUND) ?
56 "no _OSC support" : "_OSC failed");