1 files changed, 54 insertions, 0 deletions

diff --git a/drivers/pci/pcie/pme/pcie_pme_acpi.c b/drivers/pci/pcie/pme/pcie_pme_acpi.c
new file mode 100644
index 000000000000..83ab2287ae3f
--- /dev/null
+++ b/drivers/pci/pcie/pme/pcie_pme_acpi.c
@@ -0,0 +1,54 @@
+/*
+ * 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;
+}