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path: root/drivers/pci/pcie/pme/pcie_pme_acpi.c
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Diffstat (limited to 'drivers/pci/pcie/pme/pcie_pme_acpi.c')
-rw-r--r--drivers/pci/pcie/pme/pcie_pme_acpi.c54
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 00000000000..83ab2287ae3
--- /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;
+}