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 * @pciedev: pcie_device which AER is being enabled on
24 *
25 * @return: Zero on success. Nonzero 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 **/
30 int aer_osc_setup(struct pcie_device *pciedev)
31 {
32 acpi_status status = AE_NOT_FOUND;
33 struct pci_dev *pdev = pciedev->port;
34 acpi_handle handle = 0;
35
36 /* Find root host bridge */
37 while (pdev->bus && pdev->bus->self)
38 pdev = pdev->bus->self;
39 handle = acpi_get_pci_rootbridge_handle(
40 pci_domain_nr(pdev->bus), pdev->bus->number);
41
42 if (handle) {
43 pcie_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);
44 status = pci_osc_control_set(handle,
45 OSC_PCI_EXPRESS_AER_CONTROL |
46 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
47 }
48
49 if (ACPI_FAILURE(status)) {
50 printk(KERN_DEBUG "AER service couldn't init device %s - %s\n",
51 pciedev->device.bus_id,
52 (status == AE_SUPPORT || status == AE_NOT_FOUND) ?
53 "no _OSC support" : "Run ACPI _OSC fails");
54 return -1;
55 }
56
57 return 0;
58 }
59
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