[PATCH edk2-platforms 2/3] Platform/ARM/Sgi: allow MM_STANDALONE modules to use NorFlashPlatformLib

[Jagadeesh Ujja <jagadeesh.ujja@arm.com>]

“NorFlashPlatformLib” library can be used by MM_STANDALONE drivers as
well. When used in MM mode, the third instance of the NOR flash is used as
the non-volatile storage. This NOR flash instance is partitioned into
two regions - first 4MB space is used for secure boot and next 3MB for
secure variable storage

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
---
 Platform/ARM/SgiPkg/Library/NorFlashLib/StandaloneMmNorFlashLib.c   | 63 ++++++++++++++++++++
 Platform/ARM/SgiPkg/Library/NorFlashLib/StandaloneMmNorFlashLib.inf | 35 +++++++++++
 2 files changed, 98 insertions(+)

diff --git a/Platform/ARM/SgiPkg/Library/NorFlashLib/StandaloneMmNorFlashLib.c b/Platform/ARM/SgiPkg/Library/NorFlashLib/StandaloneMmNorFlashLib.c
new file mode 100644
index 0000000..06e3f97
--- /dev/null
+++ b/Platform/ARM/SgiPkg/Library/NorFlashLib/StandaloneMmNorFlashLib.c
@@ -0,0 +1,63 @@
+/** @file
+
+  Copyright (c) 2019, ARM Ltd. All rights reserved.
+
+  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 <PiMm.h>
+#include <Library/DebugLib.h>
+#include <Library/IoLib.h>
+#include <Library/NorFlashPlatformLib.h>
+#include <SgiPlatform.h>
+
+STATIC NOR_FLASH_DESCRIPTION mNorFlashDevices[] = {
+  {
+    // Secure Boot storage space of 4MB
+    SGI_EXP_SMC_CS2_BASE,
+    SGI_EXP_SMC_CS2_BASE,
+    SIZE_256KB * 16,
+    SIZE_256KB,
+  },
+  {
+    //Secure variable storage space of 1MB*3
+    SGI_EXP_SMC_CS2_BASE,
+    SGI_EXP_SMC_CS2_BASE + SIZE_256KB * 16,
+    SIZE_256KB * 12,
+    SIZE_256KB,
+  },
+};
+
+EFI_STATUS
+NorFlashPlatformInitialization (
+  VOID
+  )
+{
+  UINT64 SysRegFlash;
+
+  SysRegFlash = SGI_EXP_SYSPH_SYSTEM_REGISTERS + SGI_SYSPH_SYS_REG_FLASH;
+  MmioOr32 (SysRegFlash, SGI_SYSPH_SYS_REG_FLASH_RWEN);
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+NorFlashPlatformGetDevices (
+  OUT NOR_FLASH_DESCRIPTION   **NorFlashDevices,
+  OUT UINT32                  *Count
+  )
+{
+  if ((NorFlashDevices == NULL) || (Count == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  *NorFlashDevices = mNorFlashDevices;
+  *Count = ARRAY_SIZE (mNorFlashDevices);
+  return EFI_SUCCESS;
+}
diff --git a/Platform/ARM/SgiPkg/Library/NorFlashLib/StandaloneMmNorFlashLib.inf b/Platform/ARM/SgiPkg/Library/NorFlashLib/StandaloneMmNorFlashLib.inf
new file mode 100644
index 0000000..eedfacc
--- /dev/null
+++ b/Platform/ARM/SgiPkg/Library/NorFlashLib/StandaloneMmNorFlashLib.inf
@@ -0,0 +1,35 @@
+#/** @file
+#
+#  Copyright (c) 2019, ARM Ltd. All rights reserved.
+
+#  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                    = 0x0001001A
+  BASE_NAME                      = NorFlashSgiLib
+  FILE_GUID                      = 2ce22190-b933-4d1e-99ba-8bf1f0768255
+  MODULE_TYPE                    = MM_STANDALONE
+  VERSION_STRING                 = 1.0
+  PI_SPECIFICATION_VERSION       = 0x00010032
+  LIBRARY_CLASS                  = NorFlashPlatformLib
+
+[Sources.common]
+  StandaloneMmNorFlashLib.c
+
+[Packages]
+  ArmPlatformPkg/ArmPlatformPkg.dec
+  MdePkg/MdePkg.dec
+  Platform/ARM/SgiPkg/SgiPlatform.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  IoLib
-- 
2.7.4