/** @file
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*
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* Support ResetSystem Runtime call using PSCI calls.
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* Signals the gRaspberryPiEventResetGuid event group on reset.
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*
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* Copyright (c) 2018, Andrei Warkentin <andrey.warkentin@gmail.com>
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* Copyright (c) 2014, Linaro Ltd. All rights reserved.
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* Copyright (c) 2013-2015, ARM Ltd. All rights reserved.
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* Copyright (c) 2008-2009, Apple Inc. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-2-Clause-Patent
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*
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**/
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#include <PiDxe.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/TimerLib.h>
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#include <Library/EfiResetSystemLib.h>
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#include <Library/ArmSmcLib.h>
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#include <Library/UefiLib.h>
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#include <Library/UefiRuntimeLib.h>
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#include <IndustryStandard/ArmStdSmc.h>
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/**
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Resets the entire platform.
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@param ResetType The type of reset to perform.
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@param ResetStatus The status code for the reset.
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@param DataSize The size, in bytes, of WatchdogData.
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@param ResetData For a ResetType of EfiResetCold, EfiResetWarm, or
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EfiResetShutdown the data buffer starts with a Null-terminated
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Unicode string, optionally followed by additional binary data.
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**/
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EFI_STATUS
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EFIAPI
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LibResetSystem (
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IN EFI_RESET_TYPE ResetType,
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IN EFI_STATUS ResetStatus,
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IN UINTN DataSize,
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IN CHAR16 *ResetData OPTIONAL
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)
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{
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ARM_SMC_ARGS ArmSmcArgs;
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UINT32 Delay;
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if (!EfiAtRuntime ()) {
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/*
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* Only if still in UEFI.
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*/
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EfiEventGroupSignal (&gRaspberryPiEventResetGuid);
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Delay = PcdGet32 (PcdPlatformResetDelay);
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if (Delay != 0) {
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DEBUG ((DEBUG_INFO, "Platform will be reset in %d.%d seconds...\n",
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Delay / 1000000, (Delay % 1000000) / 100000));
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MicroSecondDelay (Delay);
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}
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}
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DEBUG ((DEBUG_INFO, "Platform %a.\n",
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(ResetType == EfiResetShutdown) ? "shutdown" : "reset"));
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switch (ResetType) {
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case EfiResetPlatformSpecific:
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// Map the platform specific reset as reboot
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case EfiResetWarm:
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// Map a warm reset into a cold reset
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case EfiResetCold:
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// Send a PSCI 0.2 SYSTEM_RESET command
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ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_RESET;
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break;
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case EfiResetShutdown:
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// Send a PSCI 0.2 SYSTEM_OFF command
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ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_OFF;
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break;
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default:
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ASSERT (FALSE);
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return EFI_UNSUPPORTED;
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}
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ArmCallSmc (&ArmSmcArgs);
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// We should never be here
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DEBUG ((DEBUG_ERROR, "%a: PSCI Reset failed\n", __FUNCTION__));
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CpuDeadLoop ();
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return EFI_UNSUPPORTED;
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}
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/**
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Initialize any infrastructure required for LibResetSystem () to function.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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LibInitializeResetSystem (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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return EFI_SUCCESS;
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}
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