[edk2-staging/RISC-V-V2 PATCH v1 15/22]: RiscVPkg/RealTimeClockRuntimeDxe: Add RISC-V RTC Runtime Driver

["Abner Chang" <abner.chang@hpe.com>]

This is the abstract driver which incorporate with platform level RTC library (RealTimeClockLib) to provide Real Time Clock Architecture Protocol.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Abner Chang <abner.chang@hpe.com>
---
 .../RealTimeClockRuntimeDxe/RealTimeClock.c        | 157 +++++++++++++++++++++
 .../RealTimeClockRuntimeDxe.inf                    |  44 ++++++
 2 files changed, 201 insertions(+)
 create mode 100644 RiscVPkg/Universal/RealTimeClockRuntimeDxe/RealTimeClock.c
 create mode 100644 RiscVPkg/Universal/RealTimeClockRuntimeDxe/RealTimeClockRuntimeDxe.inf

diff --git a/RiscVPkg/Universal/RealTimeClockRuntimeDxe/RealTimeClock.c b/RiscVPkg/Universal/RealTimeClockRuntimeDxe/RealTimeClock.c
new file mode 100644
index 0000000..c3d04e7
--- /dev/null
+++ b/RiscVPkg/Universal/RealTimeClockRuntimeDxe/RealTimeClock.c
@@ -0,0 +1,157 @@
+/** @file
+  Implementation of EFI RealTimeClock runtime services via platform RTC Lib. 
+
+  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR> 
+  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which 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 <PiDxe.h>
+#include <Library/UefiLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/RealTimeClockLib.h>
+#include <Protocol/RealTimeClock.h>
+
+EFI_HANDLE  mHandle = NULL;
+
+/**
+  Returns the current time and date information, and the time-keeping capabilities
+  of the hardware platform.
+
+  @param  Time                  A pointer to storage to receive a snapshot of the current time.
+  @param  Capabilities          An optional pointer to a buffer to receive the real time clock
+                                device's capabilities.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+  @retval EFI_INVALID_PARAMETER Time is NULL.
+  @retval EFI_DEVICE_ERROR      The time could not be retrieved due to hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+GetTime (
+  OUT EFI_TIME                *Time,
+  OUT  EFI_TIME_CAPABILITIES  *Capabilities
+  )
+{
+  return LibGetTime (Time, Capabilities);
+}
+
+
+
+/**
+  Sets the current local time and date information.
+
+  @param  Time                  A pointer to the current time.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+  @retval EFI_INVALID_PARAMETER A time field is out of range.
+  @retval EFI_DEVICE_ERROR      The time could not be set due due to hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+SetTime (
+  IN EFI_TIME                *Time
+  )
+{
+  return LibSetTime (Time);
+}
+
+
+/**
+  Returns the current wakeup alarm clock setting.
+
+  @param  Enabled               Indicates if the alarm is currently enabled or disabled.
+  @param  Pending               Indicates if the alarm signal is pending and requires acknowledgement.
+  @param  Time                  The current alarm setting.
+
+  @retval EFI_SUCCESS           The alarm settings were returned.
+  @retval EFI_INVALID_PARAMETER Any parameter is NULL.
+  @retval EFI_DEVICE_ERROR      The wakeup time could not be retrieved due to a hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+GetWakeupTime (
+  OUT BOOLEAN     *Enabled,
+  OUT BOOLEAN     *Pending,
+  OUT EFI_TIME    *Time
+  )
+{
+  return LibGetWakeupTime (Enabled, Pending, Time);
+}
+
+
+/**
+  Sets the system wakeup alarm clock time.
+
+  @param  Enabled               Enable or disable the wakeup alarm.
+  @param  Time                  If Enable is TRUE, the time to set the wakeup alarm for.
+
+  @retval EFI_SUCCESS           If Enable is TRUE, then the wakeup alarm was enabled. If
+                                Enable is FALSE, then the wakeup alarm was disabled.
+  @retval EFI_INVALID_PARAMETER A time field is out of range.
+  @retval EFI_DEVICE_ERROR      The wakeup time could not be set due to a hardware error.
+  @retval EFI_UNSUPPORTED       A wakeup timer is not supported on this platform.
+
+**/
+EFI_STATUS
+EFIAPI
+SetWakeupTime (
+  IN BOOLEAN      Enabled,
+  OUT EFI_TIME    *Time
+  )
+{
+  return LibSetWakeupTime (Enabled, Time);
+}
+
+
+
+/**
+  This is the declaration of an EFI image entry point. This can be the entry point to an application
+  written to this specification, an EFI boot service driver, or an EFI runtime driver.
+
+  @param  ImageHandle           Handle that identifies the loaded image.
+  @param  SystemTable           System Table for this image.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+
+**/
+EFI_STATUS
+EFIAPI
+InitializeRealTimeClock (
+  IN EFI_HANDLE                            ImageHandle,
+  IN EFI_SYSTEM_TABLE                      *SystemTable
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = LibRtcInitialize (ImageHandle, SystemTable);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  SystemTable->RuntimeServices->GetTime       = GetTime;
+  SystemTable->RuntimeServices->SetTime       = SetTime;
+  SystemTable->RuntimeServices->GetWakeupTime = GetWakeupTime;
+  SystemTable->RuntimeServices->SetWakeupTime = SetWakeupTime;
+
+  Status = gBS->InstallMultipleProtocolInterfaces (
+                  &mHandle,
+                  &gEfiRealTimeClockArchProtocolGuid,
+                  NULL,
+                  NULL
+                  );
+
+  return Status;
+}
+
diff --git a/RiscVPkg/Universal/RealTimeClockRuntimeDxe/RealTimeClockRuntimeDxe.inf b/RiscVPkg/Universal/RealTimeClockRuntimeDxe/RealTimeClockRuntimeDxe.inf
new file mode 100644
index 0000000..afc1bca
--- /dev/null
+++ b/RiscVPkg/Universal/RealTimeClockRuntimeDxe/RealTimeClockRuntimeDxe.inf
@@ -0,0 +1,44 @@
+#/** @file
+# This driver installs RTC Architecture Protocol
+#
+#  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+#  Copyright (c) 2006 - 2007, 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
+#  which 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.
+#
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = RealTimeClock
+  FILE_GUID                      = C641D483-B367-40EF-96B3-860B75A4604E
+  MODULE_TYPE                    = DXE_RUNTIME_DRIVER
+  VERSION_STRING                 = 1.0
+
+  ENTRY_POINT                    = InitializeRealTimeClock
+
+[Sources.common]
+  RealTimeClock.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  RiscVPkg/RiscVPkg.dec
+
+[LibraryClasses]
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+  DebugLib
+  RealTimeClockLib
+
+[Protocols]
+  gEfiRealTimeClockArchProtocolGuid
+
+[Depex]
+  TRUE
+
-- 
2.7.4