55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
|
/*
|
||
|
|
* 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;
|
||
|
|
}
|