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