| 878ddf1f |
1 | /*++\r |
| 2 | \r |
| 3 | Copyright (c) 2006, Intel Corporation \r |
| 4 | All rights reserved. This program and the accompanying materials \r |
| 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 |
| f0ec738d |
24 | #include "pcibus.h"\r |
| 878ddf1f |
25 | \r |
| 26 | EFI_STATUS\r |
| 27 | ResetPowerManagementFeature (\r |
| 28 | IN PCI_IO_DEVICE *PciIoDevice\r |
| 29 | )\r |
| 30 | /*++\r |
| 31 | \r |
| 32 | Routine Description:\r |
| 33 | \r |
| 34 | This function is intended to turn off PWE assertion and\r |
| 35 | put the device to D0 state if the device supports\r |
| 36 | PCI Power Management.\r |
| 37 | \r |
| 38 | Arguments:\r |
| 39 | \r |
| 40 | Returns:\r |
| 41 | \r |
| 42 | None\r |
| 43 | \r |
| 44 | --*/\r |
| 45 | // TODO: PciIoDevice - add argument and description to function comment\r |
| 46 | // TODO: EFI_UNSUPPORTED - add return value to function comment\r |
| 47 | // TODO: EFI_SUCCESS - add return value to function comment\r |
| 48 | {\r |
| 49 | EFI_STATUS Status;\r |
| 50 | UINT8 PowerManagementRegBlock;\r |
| 51 | UINT16 PMCSR;\r |
| 52 | \r |
| 53 | PowerManagementRegBlock = 0;\r |
| 54 | \r |
| 55 | Status = LocateCapabilityRegBlock (\r |
| 56 | PciIoDevice,\r |
| 57 | EFI_PCI_CAPABILITY_ID_PMI,\r |
| 58 | &PowerManagementRegBlock,\r |
| 59 | NULL\r |
| 60 | );\r |
| 61 | \r |
| 62 | if (EFI_ERROR (Status)) {\r |
| 63 | return EFI_UNSUPPORTED;\r |
| 64 | }\r |
| 65 | \r |
| 66 | //\r |
| 67 | // Turn off the PWE assertion and put the device into D0 State\r |
| 68 | //\r |
| 69 | PMCSR = 0x8000;\r |
| 70 | \r |
| 71 | //\r |
| 72 | // Write PMCSR\r |
| 73 | //\r |
| 74 | PciIoDevice->PciIo.Pci.Write (\r |
| 75 | &PciIoDevice->PciIo,\r |
| 76 | EfiPciIoWidthUint16,\r |
| 77 | PowerManagementRegBlock + 4,\r |
| 78 | 1,\r |
| 79 | &PMCSR\r |
| 80 | );\r |
| 81 | \r |
| 82 | return EFI_SUCCESS;\r |
| 83 | }\r |
projects / mirror_edk2.git / blame