diff options
Diffstat (limited to 'Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiOcWdtLib/PeiOcWdtLib.c')
| -rw-r--r-- | Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiOcWdtLib/PeiOcWdtLib.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiOcWdtLib/PeiOcWdtLib.c b/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiOcWdtLib/PeiOcWdtLib.c new file mode 100644 index 0000000000..0996b02ea6 --- /dev/null +++ b/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiOcWdtLib/PeiOcWdtLib.c @@ -0,0 +1,138 @@ +/** @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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