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eeefcb9d | 1 | /** @file\r |
8e8227d1 | 2 | Power management support fucntions implementation for PCI Bus module.\r |
3db51098 | 3 | \r |
8e8227d1 | 4 | Copyright (c) 2006 - 2009, Intel Corporation\r |
5 | All rights reserved. This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
3db51098 | 12 | \r |
13 | **/\r | |
ead42efc | 14 | \r |
03417d8d | 15 | #include "PciBus.h"\r |
ead42efc | 16 | \r |
bcd70414 | 17 | /**\r |
ead42efc | 18 | This function is intended to turn off PWE assertion and\r |
19 | put the device to D0 state if the device supports\r | |
20 | PCI Power Management.\r | |
21 | \r | |
8e8227d1 | 22 | @param PciIoDevice PCI device instance.\r |
23 | \r | |
24 | @retval EFI_UNSUPPORTED PCI Device does not support power management.\r | |
25 | @retval EFI_SUCCESS Turned off PWE successfully.\r | |
ead42efc | 26 | \r |
bcd70414 | 27 | **/\r |
57076f45 | 28 | EFI_STATUS\r |
29 | ResetPowerManagementFeature (\r | |
30 | IN PCI_IO_DEVICE *PciIoDevice\r | |
31 | )\r | |
ead42efc | 32 | {\r |
33 | EFI_STATUS Status;\r | |
34 | UINT8 PowerManagementRegBlock;\r | |
5326528b | 35 | UINT16 PowerManagementCSR;\r |
ead42efc | 36 | \r |
37 | PowerManagementRegBlock = 0;\r | |
38 | \r | |
39 | Status = LocateCapabilityRegBlock (\r | |
40 | PciIoDevice,\r | |
41 | EFI_PCI_CAPABILITY_ID_PMI,\r | |
42 | &PowerManagementRegBlock,\r | |
43 | NULL\r | |
44 | );\r | |
45 | \r | |
46 | if (EFI_ERROR (Status)) {\r | |
47 | return EFI_UNSUPPORTED;\r | |
48 | }\r | |
49 | \r | |
50 | //\r | |
51 | // Turn off the PWE assertion and put the device into D0 State\r | |
52 | //\r | |
5326528b | 53 | PowerManagementCSR = 0x8000;\r |
ead42efc | 54 | \r |
55 | //\r | |
56 | // Write PMCSR\r | |
57 | //\r | |
9eb130ff | 58 | PciIoDevice->PciIo.Pci.Write (\r |
59 | &PciIoDevice->PciIo,\r | |
60 | EfiPciIoWidthUint16,\r | |
61 | PowerManagementRegBlock + 4,\r | |
62 | 1,\r | |
63 | &PowerManagementCSR\r | |
64 | );\r | |
ead42efc | 65 | \r |
66 | return EFI_SUCCESS;\r | |
67 | }\r | |
57076f45 | 68 | \r |