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