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Diffstat (limited to 'ReferenceCode/Chipset/LynxPoint/Wdt/Dxe/WdtDxe.c')
| -rw-r--r-- | ReferenceCode/Chipset/LynxPoint/Wdt/Dxe/WdtDxe.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/ReferenceCode/Chipset/LynxPoint/Wdt/Dxe/WdtDxe.c b/ReferenceCode/Chipset/LynxPoint/Wdt/Dxe/WdtDxe.c new file mode 100644 index 0000000..ea5bd2f --- /dev/null +++ b/ReferenceCode/Chipset/LynxPoint/Wdt/Dxe/WdtDxe.c @@ -0,0 +1,218 @@ +/** @file + Implementation file for Watchdog Timer functionality + +@copyright + Copyright (c) 2010 - 2012 Intel Corporation. All rights reserved + This software and associated documentation (if any) is furnished + under a license and may only be used or copied in accordance + with the terms of the license. Except as permitted by such + license, no part of this software or documentation may be + reproduced, stored in a retrieval system, or transmitted in any + form or by any means without the express written consent of + Intel Corporation. + + This file contains an 'Intel Peripheral Driver' and uniquely + identified as "Intel Reference Module" and is + licensed for Intel CPUs and chipsets under the terms of your + license agreement with Intel or your vendor. This file may + be modified by the user, subject to additional terms of the + license agreement +**/ +#if !defined(EDK_RELEASE_VERSION) || (EDK_RELEASE_VERSION < 0x00020000) +#include "EdkIIGlueDxe.h" +#endif + +#include EFI_PROTOCOL_CONSUMER (PchReset) +#include "WdtCommon.h" +#include EFI_PROTOCOL_PRODUCER (Wdt) + +VOID +EFIAPI +WdtRunBeforeOsBoot ( + IN EFI_EVENT Event, + IN VOID *Context + ); + +EFI_STATUS +EFIAPI +WdtPchResetCallback ( + IN PCH_RESET_TYPE PchResetType + ); + +#define TIMEOUT_AFTER_POST_MULTIPLIER 16 +#define MINIMUM_TIMEOUT_AT_S4_EXIT 600 ///< 10 minutes +EFI_HANDLE mImageHandle; +WDT_PROTOCOL mWdtProtocol = { + WdtReloadAndStart, + WdtCheckStatus, + WdtDisable, + WdtAllowKnownReset, + IsWdtRequired, + IsWdtEnabled +}; + +PCH_RESET_CALLBACK_PROTOCOL mPchResetCallbackProtocol = { WdtPchResetCallback }; + +/** + Installs WDT protocol. + Registers a function to be executed just before booting to OS. + + @param[in] ImageHandle Image handle for this driver image + @param[in] SystemTable Pointer to the EFI System Table + + @retval EFI_SUCCESS WDT DXE driver initialization completed successfully +**/ +EFI_STATUS +WdtDxeEntryPoint ( + IN EFI_HANDLE ImageHandle, + IN EFI_SYSTEM_TABLE *SystemTable + ) +{ + EFI_STATUS Status; + EFI_EVENT Event; + + DEBUG ((EFI_D_INFO, "(Wdt) Entry Point to WdtDxe\n")); + + mImageHandle = ImageHandle; + + Status = gBS->CreateEvent ( + EVENT_SIGNAL_EXIT_BOOT_SERVICES, + EFI_TPL_CALLBACK, + WdtRunBeforeOsBoot, + NULL, + &Event + ); + ASSERT_EFI_ERROR (Status); + + Status = EfiCreateEventLegacyBootEx ( + EFI_TPL_CALLBACK, + WdtRunBeforeOsBoot, + NULL, + &Event + ); + ASSERT_EFI_ERROR (Status); + + DEBUG ((EFI_D_INFO, "(Wdt) WDT event registration; Status = %r\n", Status)); + + Status = gBS->InstallProtocolInterface ( + &ImageHandle, + &gWdtProtocolGuid, + EFI_NATIVE_INTERFACE, + &mWdtProtocol + ); + ASSERT_EFI_ERROR (Status); + + Status = gBS->InstallProtocolInterface ( + &ImageHandle, + &gPchResetCallbackProtocolGuid, + EFI_NATIVE_INTERFACE, + &mPchResetCallbackProtocol + ); + ASSERT_EFI_ERROR (Status); + + return EFI_SUCCESS; +} + +/** + Turns on watchdog timer just before booting to OS, if an OS application requested that. + Clears request status. + Uninstalls Wdt protocol to prevent other modules from interfering with actions described above. + + @param[in] Event useless here, but required in functions invoked by events + @param[in] Context useless here, but required in functions invoked by events + + @retval None +**/ +VOID +EFIAPI +WdtRunBeforeOsBoot ( + IN EFI_EVENT Event, + IN VOID *Context + ) +{ + UINT32 ReloadValue; + UINT32 Readback; + EFI_STATUS Status; + EFI_BOOT_MODE BootMode; + EFI_PEI_HOB_POINTERS HobList; + WDT_HOB *WdtHob; + + gBS->CloseEvent (Event); + + DEBUG ((EFI_D_INFO, "(Wdt) RunWdtBeforeOsBoot\n")); + Status = gBS->UninstallProtocolInterface ( + mImageHandle, + &gWdtProtocolGuid, + &mWdtProtocol + ); + + Status = gBS->UninstallProtocolInterface ( + mImageHandle, + &gPchResetCallbackProtocolGuid, + &mPchResetCallbackProtocol + ); + /// + /// check boot type, there are different flows for S4/S5 + /// + EfiGetSystemConfigurationTable (&gEfiHobListGuid, (VOID **) &HobList.Raw); + if (HobList.Header->HobType != EFI_HOB_TYPE_HANDOFF) { + DEBUG ((EFI_D_ERROR, "(Wdt) Handoff Hob missing!\n")); + return; + } + + BootMode = HobList.HandoffInformationTable->BootMode; + + WdtHob = GetFirstGuidHob (&mWdtHobGuid); + if (WdtHob == NULL) { + return; + } + + Readback = IoRead32 (WdtGetAddress ()); + ReloadValue = TIMEOUT_AFTER_POST_MULTIPLIER * ((Readback & B_PCH_OC_WDT_CTL_AFTER_POST) >> 16); + + if (BootMode == BOOT_ON_S4_RESUME) { + /// + /// S4 resume: if WDT was enabled before S0->S4 transition, + /// then WDT must be turned on even though TimeoutValueAfterPost == 0 + /// unlike in S5->S0 flow, ToVaP is not set to zero after being consumed + /// + if (WdtHob->Active == 1) { + if (ReloadValue != 0) { + WdtReloadAndStart (ReloadValue); + } else { + WdtReloadAndStart (MINIMUM_TIMEOUT_AT_S4_EXIT); + } + } else { + WdtDisable (); + } + } else if (ReloadValue != 0) { + /// + /// start WDT with TimeoutValueAfterPost and clear that value from register + /// + Readback &= ~(B_PCH_OC_WDT_CTL_AFTER_POST); + IoWrite32 (WdtGetAddress (), Readback); + WdtReloadAndStart (ReloadValue); + } else { + WdtDisable (); + } + + return; +} + +/** + WDT call back function for Pch Reset. + + @param[in] PchResetType Pch Reset Types which includes PowerCycle, Globalreset. + + @retval EFI_SUCCESS The function completed successfully + @retval Others All other error conditions encountered result in an ASSERT. +**/ +EFI_STATUS +EFIAPI +WdtPchResetCallback ( + IN PCH_RESET_TYPE PchResetType + ) +{ + WdtAllowKnownReset (); + return EFI_SUCCESS; +} |