[net-next-2.6.git] / drivers / pci / pcie / pme / pcie_pme_acpi.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;
}
Commit	Line	Data
c7f48656 RW	1	/*
	2	* PCIe Native PME support, ACPI-related part
	3	*
	4	* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License V2. See the file "COPYING" in the main directory of this archive
	8	* for more details.
	9	*/
	10
	11	#include <linux/pci.h>
	12	#include <linux/kernel.h>
	13	#include <linux/errno.h>
	14	#include <linux/acpi.h>
	15	#include <linux/pci-acpi.h>
	16	#include <linux/pcieport_if.h>
	17
	18	/**
	19	* pcie_pme_acpi_setup - Request the ACPI BIOS to release control over PCIe PME.
	20	* @srv - PCIe PME service for a root port or event collector.
	21	*
	22	* Invoked when the PCIe bus type loads PCIe PME service driver. To avoid
	23	* conflict with the BIOS PCIe support requires the BIOS to yield PCIe PME
	24	* control to the kernel.
	25	*/
	26	int pcie_pme_acpi_setup(struct pcie_device *srv)
	27	{
	28	acpi_status status = AE_NOT_FOUND;
	29	struct pci_dev *port = srv->port;
	30	acpi_handle handle;
	31	int error = 0;
	32
	33	if (acpi_pci_disabled)
	34	return -ENOSYS;
	35
	36	dev_info(&port->dev, "Requesting control of PCIe PME from ACPI BIOS\n");
	37
	38	handle = acpi_find_root_bridge_handle(port);
	39	if (!handle)
	40	return -EINVAL;
	41
	42	status = acpi_pci_osc_control_set(handle,
	43	OSC_PCI_EXPRESS_PME_CONTROL \|
	44	OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
	45	if (ACPI_FAILURE(status)) {
	46	dev_info(&port->dev,
	47	"Failed to receive control of PCIe PME service: %s\n",
	48	(status == AE_SUPPORT \|\| status == AE_NOT_FOUND) ?
	49	"no _OSC support" : "ACPI _OSC failed");
	50	error = -ENODEV;
	51	}
	52
	53	return error;
	54	}