projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 658e7a41 AB |
1 | /** @file\r |
| 2 | FDT client library for ARM's PL031 RTC driver\r | |
| 3 | \r | |
| 4 | Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>\r | |
| 5 | \r | |
| 6 | This program and the accompanying materials\r | |
| 7 | are licensed and made available under the terms and conditions of the BSD License\r | |
| 8 | which accompanies this distribution. The full text of the license may be found at\r | |
| 9 | http://opensource.org/licenses/bsd-license.php\r | |
| 10 | \r | |
| 11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 13 | \r | |
| 14 | **/\r | |
| 15 | \r | |
| 16 | #include <Uefi.h>\r | |
| 17 | \r | |
| 18 | #include <Library/BaseLib.h>\r | |
| 19 | #include <Library/DebugLib.h>\r | |
| 20 | #include <Library/PcdLib.h>\r | |
| 21 | #include <Library/UefiBootServicesTableLib.h>\r | |
| 22 | \r | |
| 23 | #include <Protocol/FdtClient.h>\r | |
| 24 | \r | |
| 25 | RETURN_STATUS\r | |
| 26 | EFIAPI\r | |
| 27 | ArmVirtPL031FdtClientLibConstructor (\r | |
| 28 | VOID\r | |
| 29 | )\r | |
| 30 | {\r | |
| 31 | EFI_STATUS Status;\r | |
| 32 | FDT_CLIENT_PROTOCOL *FdtClient;\r | |
| 33 | INT32 Node;\r | |
| 34 | CONST UINT64 *Reg;\r | |
| 35 | UINT32 RegSize;\r | |
| 36 | UINT64 RegBase;\r | |
| 37 | \r | |
| 38 | Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,\r | |
| 39 | (VOID **)&FdtClient);\r | |
| 40 | ASSERT_EFI_ERROR (Status);\r | |
| 41 | \r | |
| 42 | Status = FdtClient->FindCompatibleNode (FdtClient, "arm,pl031", &Node);\r | |
| 43 | if (EFI_ERROR (Status)) {\r | |
| 44 | DEBUG ((EFI_D_WARN, "%a: No 'arm,pl031' compatible DT node found\n",\r | |
| 45 | __FUNCTION__));\r | |
| 46 | return EFI_SUCCESS;\r | |
| 47 | }\r | |
| 48 | \r | |
| 49 | Status = FdtClient->GetNodeProperty (FdtClient, Node, "reg",\r | |
| 50 | (CONST VOID **)&Reg, &RegSize);\r | |
| 51 | if (EFI_ERROR (Status)) {\r | |
| 52 | DEBUG ((EFI_D_WARN,\r | |
| 53 | "%a: No 'reg' property found in 'arm,pl031' compatible DT node\n",\r | |
| 54 | __FUNCTION__));\r | |
| 55 | return EFI_SUCCESS;\r | |
| 56 | }\r | |
| 57 | \r | |
| 58 | ASSERT (RegSize == 16);\r | |
| 59 | \r | |
| 60 | RegBase = SwapBytes64 (Reg[0]);\r | |
| 61 | ASSERT (RegBase < MAX_UINT32);\r | |
| 62 | \r | |
| 63 | PcdSet32 (PcdPL031RtcBase, (UINT32)RegBase);\r | |
| 64 | \r | |
| 65 | DEBUG ((EFI_D_INFO, "Found PL031 RTC @ 0x%Lx\n", RegBase));\r | |
| 66 | \r | |
| 67 | if (!FeaturePcdGet (PcdPureAcpiBoot)) {\r | |
| 68 | //\r | |
| 69 | // UEFI takes ownership of the RTC hardware, and exposes its functionality\r | |
| 70 | // through the UEFI Runtime Services GetTime, SetTime, etc. This means we\r | |
| 71 | // need to disable it in the device tree to prevent the OS from attaching\r | |
| 72 | // its device driver as well.\r | |
| 73 | //\r | |
| 74 | Status = FdtClient->SetNodeProperty (FdtClient, Node, "status",\r | |
| 75 | "disabled", sizeof ("disabled"));\r | |
| 76 | if (EFI_ERROR (Status)) {\r | |
| 77 | DEBUG ((EFI_D_WARN, "Failed to set PL031 status to 'disabled'\n"));\r | |
| 78 | }\r | |
| 79 | }\r | |
| 80 | \r | |
| 81 | return EFI_SUCCESS;\r | |
| 82 | }\r |