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/** @file
The PEI Library Implements OcWdt Support.
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under
the terms and conditions of the BSD License that accompanies this distribution.
The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Library/DebugLib.h>
#include <Library/PeiServicesLib.h>
#include <Ppi/Wdt.h>
#include <Library/PchWdtCommonLib.h>
#include <PchAccess.h>
#include <Library/PchCycleDecodingLib.h>
#include <Library/IoLib.h>
static WDT_PPI mWdtPpi = {
WdtReloadAndStart,
WdtCheckStatus,
WdtDisable,
WdtAllowKnownReset,
IsWdtRequired,
IsWdtEnabled
};
static EFI_PEI_PPI_DESCRIPTOR mInstallWdtPpi = {
(EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
&gWdtPpiGuid,
&mWdtPpi
};
/**
Reads PCH registers to check if platform wakes from S3/S4
@retval TRUE if platfrom wakes from S3/S4
@retval FALSE otherwise
**/
BOOLEAN
IsWakeFromS3S4 (
VOID
)
{
UINT16 ABase;
UINT16 SleepType;
PchAcpiBaseGet (&ABase);
if (IoRead16 (ABase + R_PCH_ACPI_PM1_STS) & B_PCH_ACPI_PM1_STS_WAK) {
SleepType = IoRead16 (ABase + R_PCH_ACPI_PM1_CNT) & B_PCH_ACPI_PM1_CNT_SLP_TYP;
if ((SleepType == V_PCH_ACPI_PM1_CNT_S3) || (SleepType == V_PCH_ACPI_PM1_CNT_S4)) {
return TRUE;
}
}
return FALSE;
}
/**
Check for unexpected reset.
If there was an unexpected reset, enforces WDT expiration.
**/
VOID
OcWdtResetCheck (
VOID
)
{
UINT32 Readback;
Readback = IoRead32 (WdtGetAddress ());
DEBUG ((DEBUG_ERROR, "(WDT) OcWdtResetCheck\n"));
///
/// If there was a WDT expiration, set Failure Status and clear timeout status bits
/// Timeout status bits are cleared by writing '1'
///
if (Readback & (B_PCH_OC_WDT_CTL_ICCSURV_STS | B_PCH_OC_WDT_CTL_NO_ICCSURV_STS)) {
DEBUG ((DEBUG_ERROR, "(WDT) Expiration detected.\n", Readback));
Readback |= B_PCH_OC_WDT_CTL_FAILURE_STS;
Readback |= (B_PCH_OC_WDT_CTL_ICCSURV_STS | B_PCH_OC_WDT_CTL_NO_ICCSURV_STS);
Readback &= ~(B_PCH_OC_WDT_CTL_UNXP_RESET_STS);
} else {
///
/// If there was unexpected reset but no WDT expiration and no resume from S3/S4,
/// clear unexpected reset status and enforce expiration. This is to inform Firmware
/// which has no access to unexpected reset status bit, that something went wrong.
///
if ((Readback & B_PCH_OC_WDT_CTL_UNXP_RESET_STS) && !IsWakeFromS3S4 ()) {
#ifndef MDEPKG_NDEBUG
DEBUG ((DEBUG_ERROR, "(WDT) Unexpected reset detected and ignored.\n"));
Readback &= ~(B_PCH_OC_WDT_CTL_FAILURE_STS | B_PCH_OC_WDT_CTL_UNXP_RESET_STS);
Readback |= (B_PCH_OC_WDT_CTL_ICCSURV_STS | B_PCH_OC_WDT_CTL_NO_ICCSURV_STS);
#else
DEBUG ((DEBUG_ERROR, "(WDT) Unexpected reset detected. Enforcing Wdt expiration.\n"));
WdtReloadAndStart (1);
///
/// wait for reboot caused by WDT expiration
///
CpuDeadLoop ();
#endif
} else {
///
/// No WDT expiration and no unexpected reset - clear Failure status
///
DEBUG ((DEBUG_INFO, "(WDT) Status OK.\n", Readback));
Readback &= ~(B_PCH_OC_WDT_CTL_FAILURE_STS);
Readback |= (B_PCH_OC_WDT_CTL_ICCSURV_STS | B_PCH_OC_WDT_CTL_NO_ICCSURV_STS);
}
}
IoWrite32 (WdtGetAddress (), Readback);
}
/**
This function install WDT PPI
@retval EFI_STATUS Results of the installation of the WDT PPI
**/
EFI_STATUS
EFIAPI
OcWdtInit (
VOID
)
{
EFI_STATUS Status;
Status = PeiServicesInstallPpi (&mInstallWdtPpi);
ASSERT_EFI_ERROR (Status);
return Status;
}
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