projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 10590588 | 1 | /*++\r |
| 2 | \r | |
| b1f700a8 HT |
3 | Copyright (c) 2005 - 2006, Intel Corporation. All rights reserved.<BR>\r |
| 4 | This program and the accompanying materials \r | |
| 10590588 | 5 | are licensed and made available under the terms and conditions of the BSD License \r |
| 6 | which accompanies this distribution. The full text of the license may be found at \r | |
| 7 | http://opensource.org/licenses/bsd-license.php \r | |
| 8 | \r | |
| 9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
| 10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
| 11 | \r | |
| 12 | Module Name:\r | |
| 13 | \r | |
| 14 | PciPowerManagement.c\r | |
| 15 | \r | |
| 16 | Abstract:\r | |
| 17 | \r | |
| 18 | PCI Bus Driver\r | |
| 19 | \r | |
| 20 | Revision History\r | |
| 21 | \r | |
| 22 | --*/\r | |
| 23 | \r | |
| d8bee43c | 24 | #include "PciBus.h"\r |
| 10590588 | 25 | \r |
| 26 | EFI_STATUS\r | |
| d8bee43c | 27 | EFIAPI\r |
| 10590588 | 28 | ResetPowerManagementFeature (\r |
| 29 | IN PCI_IO_DEVICE *PciIoDevice\r | |
| 30 | )\r | |
| 31 | /*++\r | |
| 32 | \r | |
| 33 | Routine Description:\r | |
| 34 | \r | |
| 35 | This function is intended to turn off PWE assertion and\r | |
| 36 | put the device to D0 state if the device supports\r | |
| 37 | PCI Power Management.\r | |
| 38 | \r | |
| 39 | Arguments:\r | |
| 40 | \r | |
| 41 | Returns:\r | |
| 42 | \r | |
| 43 | None\r | |
| 44 | \r | |
| 45 | --*/\r | |
| 46 | {\r | |
| 47 | EFI_STATUS Status;\r | |
| 48 | UINT8 PowerManagementRegBlock;\r | |
| 49 | UINT16 PMCSR;\r | |
| 50 | \r | |
| 51 | PowerManagementRegBlock = 0;\r | |
| 52 | \r | |
| 53 | Status = LocateCapabilityRegBlock (\r | |
| 54 | PciIoDevice,\r | |
| 55 | EFI_PCI_CAPABILITY_ID_PMI,\r | |
| 56 | &PowerManagementRegBlock,\r | |
| 57 | NULL\r | |
| 58 | );\r | |
| 59 | \r | |
| 60 | if (EFI_ERROR (Status)) {\r | |
| 61 | return EFI_UNSUPPORTED;\r | |
| 62 | }\r | |
| 63 | \r | |
| 64 | //\r | |
| 65 | // Turn off the PWE assertion and put the device into D0 State\r | |
| 66 | //\r | |
| 67 | PMCSR = 0x8000;\r | |
| 68 | \r | |
| 69 | //\r | |
| 70 | // Write PMCSR\r | |
| 71 | //\r | |
| 72 | PciIoDevice->PciIo.Pci.Write (\r | |
| 73 | &PciIoDevice->PciIo,\r | |
| 74 | EfiPciIoWidthUint16,\r | |
| 75 | PowerManagementRegBlock + 4,\r | |
| 76 | 1,\r | |
| 77 | &PMCSR\r | |
| 78 | );\r | |
| 79 | \r | |
| 80 | return EFI_SUCCESS;\r | |
| 81 | }\r |