1. Impl PI 1.2 PCI part. Major changes include:

[mirror_edk2.git] / MdeModulePkg / Bus / Pci / PciBusDxe / PciPowerManagement.c

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciPowerManagement.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciPowerManagement.c
new file mode 100644 (file)
index 0000000..860d427
--- /dev/null
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciPowerManagement.c
@@ -0,0 +1,68 @@
+/** @file\r
+  Power management support fucntions implementation for PCI Bus module.\r
+\r
+Copyright (c) 2006 - 2009, Intel Corporation\r
+All rights reserved. This program and the accompanying materials\r
+are licensed and made available under the terms and conditions of the BSD License\r
+which accompanies this distribution.  The full text of the license may be found at\r
+http://opensource.org/licenses/bsd-license.php\r
+\r
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+**/\r
+\r
+#include "PciBus.h"\r
+\r
+/**\r
+  This function is intended to turn off PWE assertion and\r
+  put the device to D0 state if the device supports\r
+  PCI Power Management.\r
+\r
+  @param PciIoDevice      PCI device instance.\r
+\r
+  @retval EFI_UNSUPPORTED PCI Device does not support power management.\r
+  @retval EFI_SUCCESS     Turned off PWE successfully.\r
+\r
+**/\r
+EFI_STATUS\r
+ResetPowerManagementFeature (\r
+  IN PCI_IO_DEVICE *PciIoDevice\r
+  )\r
+{\r
+  EFI_STATUS  Status;\r
+  UINT8       PowerManagementRegBlock;\r
+  UINT16      PowerManagementCSR;\r
+\r
+  PowerManagementRegBlock = 0;\r
+\r
+  Status = LocateCapabilityRegBlock (\r
+            PciIoDevice,\r
+            EFI_PCI_CAPABILITY_ID_PMI,\r
+            &PowerManagementRegBlock,\r
+            NULL\r
+            );\r
+\r
+  if (EFI_ERROR (Status)) {\r
+    return EFI_UNSUPPORTED;\r
+  }\r
+\r
+  //\r
+  // Turn off the PWE assertion and put the device into D0 State\r
+  //\r
+  PowerManagementCSR = 0x8000;\r
+\r
+  //\r
+  // Write PMCSR\r
+  //\r
+  PciIoDevice->PciIo.Pci.Write (\r
+                           &PciIoDevice->PciIo,\r
+                           EfiPciIoWidthUint16,\r
+                           PowerManagementRegBlock + 4,\r
+                           1,\r
+                           &PowerManagementCSR\r
+                           );\r
+\r
+  return EFI_SUCCESS;\r
+}\r
+\r