| /* |
| * 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 = 0; |
| |
| /* Find root host bridge */ |
| while (pdev->bus && pdev->bus->self) |
| pdev = pdev->bus->self; |
| handle = acpi_get_pci_rootbridge_handle( |
| pci_domain_nr(pdev->bus), pdev->bus->number); |
| |
| 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; |
| } |