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3db51098 | 1 | /**@file\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 | **/\r | |
ead42efc | 13 | \r |
14 | #include "pcibus.h"\r | |
15 | \r | |
16 | EFI_STATUS\r | |
17 | ResetPowerManagementFeature (\r | |
18 | IN PCI_IO_DEVICE *PciIoDevice\r | |
19 | )\r | |
20 | /*++\r | |
21 | \r | |
22 | Routine Description:\r | |
23 | \r | |
24 | This function is intended to turn off PWE assertion and\r | |
25 | put the device to D0 state if the device supports\r | |
26 | PCI Power Management.\r | |
27 | \r | |
28 | Arguments:\r | |
29 | \r | |
30 | Returns:\r | |
31 | \r | |
32 | None\r | |
33 | \r | |
34 | --*/\r | |
35 | // TODO: PciIoDevice - add argument and description to function comment\r | |
36 | // TODO: EFI_UNSUPPORTED - add return value to function comment\r | |
37 | // TODO: EFI_SUCCESS - add return value to function comment\r | |
38 | {\r | |
39 | EFI_STATUS Status;\r | |
40 | UINT8 PowerManagementRegBlock;\r | |
41 | UINT16 PMCSR;\r | |
42 | \r | |
43 | PowerManagementRegBlock = 0;\r | |
44 | \r | |
45 | Status = LocateCapabilityRegBlock (\r | |
46 | PciIoDevice,\r | |
47 | EFI_PCI_CAPABILITY_ID_PMI,\r | |
48 | &PowerManagementRegBlock,\r | |
49 | NULL\r | |
50 | );\r | |
51 | \r | |
52 | if (EFI_ERROR (Status)) {\r | |
53 | return EFI_UNSUPPORTED;\r | |
54 | }\r | |
55 | \r | |
56 | //\r | |
57 | // Turn off the PWE assertion and put the device into D0 State\r | |
58 | //\r | |
59 | PMCSR = 0x8000;\r | |
60 | \r | |
61 | //\r | |
62 | // Write PMCSR\r | |
63 | //\r | |
64 | PciIoWrite (\r | |
65 | &PciIoDevice->PciIo,\r | |
66 | EfiPciIoWidthUint16,\r | |
67 | PowerManagementRegBlock + 4,\r | |
68 | 1,\r | |
69 | &PMCSR\r | |
70 | );\r | |
71 | \r | |
72 | return EFI_SUCCESS;\r | |
73 | }\r |