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/*
* PCIe Native PME support, ACPI-related part
*
* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License V2. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/pci-acpi.h>
#include <linux/pcieport_if.h>
/**
* pcie_pme_acpi_setup - Request the ACPI BIOS to release control over PCIe PME.
* @srv - PCIe PME service for a root port or event collector.
*
* Invoked when the PCIe bus type loads PCIe PME service driver. To avoid
* conflict with the BIOS PCIe support requires the BIOS to yield PCIe PME
* control to the kernel.
*/
int pcie_pme_acpi_setup(struct pcie_device *srv)
{
acpi_status status = AE_NOT_FOUND;
struct pci_dev *port = srv->port;
acpi_handle handle;
int error = 0;
if (acpi_pci_disabled)
return -ENOSYS;
dev_info(&port->dev, "Requesting control of PCIe PME from ACPI BIOS\n");
handle = acpi_find_root_bridge_handle(port);
if (!handle)
return -EINVAL;
status = acpi_pci_osc_control_set(handle,
OSC_PCI_EXPRESS_PME_CONTROL |
OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
if (ACPI_FAILURE(status)) {
dev_info(&port->dev,
"Failed to receive control of PCIe PME service: %s\n",
(status == AE_SUPPORT || status == AE_NOT_FOUND) ?
"no _OSC support" : "ACPI _OSC failed");
error = -ENODEV;
}
return error;
}
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