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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 |