Re: [edk2-platforms][PATCH v1] KabylakeSiliconPkg/PchPmcLib: Add GetSleepTypeAfterWakeup()

["Chaganty, Rangasai V" <rangasai.v.chaganty@intel.com>]

Reviewed-by: Sai Chaganty <rangasai.v.chaganty@intel.com>    

-----Original Message-----
From: Desimone, Nathaniel L <nathaniel.l.desimone@intel.com> 
Sent: Wednesday, August 11, 2021 6:22 PM
To: devel@edk2.groups.io
Cc: Desimone, Nathaniel L <nathaniel.l.desimone@intel.com>; Michael Kubacki <michael.kubacki@microsoft.com>; Chiu, Chasel <chasel.chiu@intel.com>; Chaganty, Rangasai V <rangasai.v.chaganty@intel.com>; Benjamin Doron <benjamin.doron00@gmail.com>
Subject: [edk2-platforms][PATCH v1] KabylakeSiliconPkg/PchPmcLib: Add GetSleepTypeAfterWakeup()

From: Michael Kubacki <michael.kubacki@microsoft.com>

Adds the capability to get the system sleep type after wakeup to PchPmcLib in KabylakeSiliconPkg.

This is needed by platforms to determine the Sx resume state.

Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Sai Chaganty <rangasai.v.chaganty@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Benjamin Doron <benjamin.doron00@gmail.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
---
 Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/PchPmcLib.c            | 54 ++++++++++++++++++++
 Silicon/Intel/KabylakeSiliconPkg/Pch/Include/Library/PchPmcLib.h                       | 15 ++++++
 Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/PeiDxeSmmPchPmcLib.inf |  4 ++
 3 files changed, 73 insertions(+)

diff --git a/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/PchPmcLib.c b/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/PchPmcLib.c
index 790af0a7a1..3c9c4c2a2d 100644
--- a/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/PchPmcLib.c
+++ b/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/Pc
+++ hPmcLib.c
@@ -128,3 +128,57 @@ PchIsRtcBatteryGood (
   }
   return FALSE;
 }
+
+/**
+  Returns the sleep type after system wakeup.
+
+  @param[out] SleepType  Sleep type to be returned.
+
+  @retval     TRUE       A wake event occurred without power failure.
+  @retval     FALSE      Power failure occurred or not a wakeup.
+
+**/
+BOOLEAN
+EFIAPI
+GetSleepTypeAfterWakeup (
+  OUT UINT32            *SleepType
+  )
+{
+  UINT16                Pm1Sts;
+  UINT32                Pm1Cnt;
+  UINTN                 PmcBaseAddress;
+
+  PmcBaseAddress = MmPciBase (
+                     DEFAULT_PCI_BUS_NUMBER_PCH,
+                     PCI_DEVICE_NUMBER_PCH_PMC,
+                     PCI_FUNCTION_NUMBER_PCH_PMC
+                     );
+
+  ///
+  /// Read the ACPI registers
+  ///
+  Pm1Sts  = IoRead16 (PcdGet16 (PcdAcpiBaseAddress) + 
+ R_PCH_ACPI_PM1_STS);  Pm1Cnt  = IoRead32 (PcdGet16 
+ (PcdAcpiBaseAddress) + R_PCH_ACPI_PM1_CNT);
+
+  ///
+  /// Get sleep type if a wake event occurred and there is no power 
+ failure and reset  ///  if ((Pm1Sts & B_PCH_ACPI_PM1_STS_WAK) != 0) {
+    if ((MmioRead16 (PmcBaseAddress + R_PCH_PMC_GEN_PMCON_B) & (B_PCH_PMC_GEN_PMCON_B_RTC_PWR_STS | B_PCH_PMC_GEN_PMCON_B_PWR_FLR)) == 0) {
+      *SleepType = Pm1Cnt & B_PCH_ACPI_PM1_CNT_SLP_TYP;
+
+      return  TRUE;
+    } else {
+      ///
+      /// Clear Wake Status (WAK_STS) and Sleep Type (SLP_TYP)
+      ///
+      IoWrite16 (PcdGet16 (PcdAcpiBaseAddress) + R_PCH_ACPI_PM1_STS, B_PCH_ACPI_PM1_STS_WAK);
+      Pm1Cnt &= ~B_PCH_ACPI_PM1_CNT_SLP_TYP;
+      IoWrite32 (PcdGet16 (PcdAcpiBaseAddress) + R_PCH_ACPI_PM1_CNT, 
+ Pm1Cnt);
+
+      return  FALSE;
+    }
+  }
+
+  return  FALSE;
+}
diff --git a/Silicon/Intel/KabylakeSiliconPkg/Pch/Include/Library/PchPmcLib.h b/Silicon/Intel/KabylakeSiliconPkg/Pch/Include/Library/PchPmcLib.h
index ec98e07100..f84606d31c 100644
--- a/Silicon/Intel/KabylakeSiliconPkg/Pch/Include/Library/PchPmcLib.h
+++ b/Silicon/Intel/KabylakeSiliconPkg/Pch/Include/Library/PchPmcLib.h
@@ -41,4 +41,19 @@ PchIsRtcBatteryGood (
   VOID
   );
 
+/**
+  Returns the sleep type after system wakeup.
+
+  @param[out] SleepType  Sleep type to be returned.
+
+  @retval     TRUE       A wake event occurred without power failure.
+  @retval     FALSE      Power failure occurred or not a wakeup.
+
+**/
+BOOLEAN
+EFIAPI
+GetSleepTypeAfterWakeup (
+  OUT UINT32            *SleepType
+  );
+
 #endif // _PCH_PMC_LIB_H_
diff --git a/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/PeiDxeSmmPchPmcLib.inf b/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/PeiDxeSmmPchPmcLib.inf
index 8b46a59b67..1e6103f4ca 100644
--- a/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/PeiDxeSmmPchPmcLib.inf
+++ b/Silicon/Intel/KabylakeSiliconPkg/Pch/Library/PeiDxeSmmPchPmcLib/Pe
+++ iDxeSmmPchPmcLib.inf
@@ -33,5 +33,9 @@ MdePkg/MdePkg.dec
 KabylakeSiliconPkg/SiPkg.dec
 
 
+[Pcd]
+gSiPkgTokenSpaceGuid.PcdAcpiBaseAddress
+
+
 [Sources]
 PchPmcLib.c
--
2.29.2.windows.2