This adds a driver that manages the 96Boards LS connector, i.e, it
installs a HII page to configure the type of mezzanine that is installed
in the slot, and it exposes this information via the LS connector protocol.
It is also in charge of applying the overlay to the platform device tree
at end of DXE.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
---
 Platform/96Boards/96Boards.dec                      |   3 +
 Platform/96Boards/Include/Guid/FormSet.h            |  23 ++
 Platform/96Boards/LsConnectorDxe/LsConnectorDxe.c   | 221 ++++++++++++++++++++
 Platform/96Boards/LsConnectorDxe/LsConnectorDxe.h   |  32 +++
 Platform/96Boards/LsConnectorDxe/LsConnectorDxe.inf |  57 +++++
 Platform/96Boards/LsConnectorDxe/LsConnectorHii.uni |  27 +++
 Platform/96Boards/LsConnectorDxe/LsConnectorHii.vfr |  45 ++++
 7 files changed, 408 insertions(+)

diff --git a/Platform/96Boards/96Boards.dec b/Platform/96Boards/96Boards.dec
index fa8e639b1a11..49641828aa60 100644
--- a/Platform/96Boards/96Boards.dec
+++ b/Platform/96Boards/96Boards.dec
@@ -37,6 +37,9 @@ [Guids]
   g96BoardsI2c1MasterGuid = { 0xcf64ac46, 0xd0be, 0x4a69, { 0x90, 0xa2, 0xf2, 
0x82, 0x5b, 0x92, 0x25, 0x61 } }
   g96BoardsSpiMasterGuid = { 0x9703fd99, 0xe638, 0x42b8, { 0xab, 0x81, 0x52, 
0x61, 0x1b, 0xf7, 0xf7, 0x5d } }
 
+  # GUID for the HII configuration form
+  g96BoardsFormsetGuid = { 0x7500c9d2, 0x9203, 0x4a37, { 0x84, 0xbb, 0x92, 
0xa9, 0xce, 0x34, 0x38, 0xbd } }
+
 [PcdsFixedAtBuild]
   # ASCII DT paths to the I2C parent nodes of the 96boards LS connector
   g96BoardsTokenSpaceGuid.PcdI2c0Parent|""|VOID*|0x00000001
diff --git a/Platform/96Boards/Include/Guid/FormSet.h 
b/Platform/96Boards/Include/Guid/FormSet.h
new file mode 100644
index 000000000000..a0475e641d69
--- /dev/null
+++ b/Platform/96Boards/Include/Guid/FormSet.h
@@ -0,0 +1,23 @@
+/** @file
+
+  Copyright (c) 2018, Linaro Limited. 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.
+
+**/
+
+#ifndef __96BOARDS_FORMSET_H__
+#define __96BOARDS_FORMSET_H__
+
+#define NINETY_SIX_BOARDS_FORMSET_GUID  \
+  { 0x7500c9d2, 0x9203, 0x4a37, { 0x84, 0xbb, 0x92, 0xa9, 0xce, 0x34, 0x38, 
0xbd } }
+
+extern EFI_GUID g96BoardsFormsetGuid;
+
+#endif // __96BOARDS_FORMSET_H__
diff --git a/Platform/96Boards/LsConnectorDxe/LsConnectorDxe.c 
b/Platform/96Boards/LsConnectorDxe/LsConnectorDxe.c
new file mode 100644
index 000000000000..f19d95635056
--- /dev/null
+++ b/Platform/96Boards/LsConnectorDxe/LsConnectorDxe.c
@@ -0,0 +1,221 @@
+/** @file
+
+  Copyright (c) 2018, Linaro, 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 <Uefi.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/HiiLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include <Protocol/LsConnector.h>
+#include <Protocol/Mezzanine.h>
+
+#include "LsConnectorDxe.h"
+
+extern  UINT8                     LsConnectorHiiBin[];
+extern  UINT8                     LsConnectorDxeStrings[];
+
+typedef struct {
+  VENDOR_DEVICE_PATH              VendorDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL        End;
+} HII_VENDOR_DEVICE_PATH;
+
+STATIC HII_VENDOR_DEVICE_PATH     m96BoardsDxeVendorDevicePath = {
+  {
+    {
+      HARDWARE_DEVICE_PATH,
+      HW_VENDOR_DP,
+      {
+        (UINT8) (sizeof (VENDOR_DEVICE_PATH)),
+        (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
+      }
+    },
+    NINETY_SIX_BOARDS_FORMSET_GUID
+  },
+  {
+    END_DEVICE_PATH_TYPE,
+    END_ENTIRE_DEVICE_PATH_SUBTYPE,
+    {
+      (UINT8) (END_DEVICE_PATH_LENGTH),
+      (UINT8) ((END_DEVICE_PATH_LENGTH) >> 8)
+    }
+  }
+};
+
+STATIC LS_CONNECTOR_PROTOCOL  mLsConnector;
+STATIC EFI_EVENT              EndOfDxeEvent;
+
+STATIC
+EFI_STATUS
+InstallHiiPages (
+  VOID
+  )
+{
+  EFI_STATUS                      Status;
+  EFI_HII_HANDLE                  HiiHandle;
+  EFI_HANDLE                      DriverHandle;
+
+  DriverHandle = NULL;
+  Status = gBS->InstallMultipleProtocolInterfaces (&DriverHandle,
+                  &gEfiDevicePathProtocolGuid,
+                  &m96BoardsDxeVendorDevicePath,
+                  NULL);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  HiiHandle = HiiAddPackages (&g96BoardsFormsetGuid,
+                              DriverHandle,
+                              LsConnectorDxeStrings,
+                              LsConnectorHiiBin,
+                              NULL);
+
+  if (HiiHandle == NULL) {
+    gBS->UninstallMultipleProtocolInterfaces (DriverHandle,
+           &gEfiDevicePathProtocolGuid,
+           &m96BoardsDxeVendorDevicePath,
+           NULL);
+    return EFI_OUT_OF_RESOURCES;
+  }
+  return EFI_SUCCESS;
+}
+
+STATIC
+VOID
+EFIAPI
+ApplyDeviceTreeOverlay (
+  EFI_EVENT           Event,
+  VOID                *Context
+  )
+{
+  VOID                    *Dtb;
+  MEZZANINE_PROTOCOL      *Mezzanine;
+  EFI_STATUS              Status;
+
+  //
+  // Find the DTB in the configuration table array. If it isn't there, just
+  // bail without an error: we may be running on an ACPI platform even if
+  // this driver does not support it [yet].
+  //
+  Status = EfiGetSystemConfigurationTable (&gFdtTableGuid, &Dtb);
+  if (Status == EFI_NOT_FOUND) {
+    return;
+  }
+  ASSERT_EFI_ERROR (Status);
+
+  Status = gBS->LocateProtocol (&g96BoardsMezzanineProtocolGuid, NULL,
+                  (VOID **)&Mezzanine);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_INFO, "%a: no mezzanine driver active\n", __FUNCTION__));
+    return;
+  }
+
+  Status = Mezzanine->ApplyDeviceTreeOverlay (Mezzanine, Dtb);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_WARN, "%a: failed to apply DT overlay - %r\n", __FUNCTION__,
+      Status));
+  }
+}
+
+/**
+  The entry point for 96BoardsDxe driver.
+
+  @param[in] ImageHandle     The image handle of the driver.
+  @param[in] SystemTable     The system table.
+
+  @retval EFI_ALREADY_STARTED     The driver already exists in system.
+  @retval EFI_OUT_OF_RESOURCES    Fail to execute entry point due to lack of
+                                  resources.
+  @retval EFI_SUCCES              All the related protocols are installed on
+                                  the driver.
+
+**/
+EFI_STATUS
+EFIAPI
+EntryPoint (
+  IN EFI_HANDLE                   ImageHandle,
+  IN EFI_SYSTEM_TABLE             *SystemTable
+  )
+{
+  EFI_STATUS                      Status;
+  NINETY_SIX_BOARDS_CONFIG_DATA   ConfigData;
+  UINTN                           BufferSize;
+
+  //
+  // Get the current config settings from the EFI variable.
+  //
+  BufferSize = sizeof (ConfigData);
+  Status = gRT->GetVariable (NINETY_SIX_BOARDS_CONFIG_VARIABLE_NAME,
+                  &g96BoardsFormsetGuid, NULL, &BufferSize, &ConfigData);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_INFO, "%a: no config data found\n", __FUNCTION__));
+    ConfigData.MezzanineType = MEZZANINE_NONE;
+  }
+
+  if (!EFI_ERROR (Status) &&
+      ConfigData.MezzanineType >= MEZZANINE_MAX) {
+    DEBUG ((DEBUG_WARN,
+      "%a: invalid value for %s, defaulting to MEZZANINE_NONE\n",
+      __FUNCTION__, NINETY_SIX_BOARDS_CONFIG_VARIABLE_NAME));
+    ConfigData.MezzanineType = MEZZANINE_NONE;
+    Status = EFI_INVALID_PARAMETER; // trigger setvar below
+  }
+
+  //
+  // Write the newly selected value back to the variable store.
+  //
+  if (EFI_ERROR (Status)) {
+    ZeroMem (&ConfigData.Reserved, sizeof (ConfigData.Reserved));
+    Status = gRT->SetVariable (NINETY_SIX_BOARDS_CONFIG_VARIABLE_NAME,
+                    &g96BoardsFormsetGuid,
+                    EFI_VARIABLE_NON_VOLATILE | 
EFI_VARIABLE_BOOTSERVICE_ACCESS,
+                    sizeof (ConfigData), &ConfigData);
+
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "%a: gRT->SetVariable () failed - %r\n",
+        __FUNCTION__, Status));
+      return Status;
+    }
+  }
+
+  switch (ConfigData.MezzanineType) {
+  case MEZZANINE_SECURE96:
+    mLsConnector.MezzanineType = MezzanineSecure96;
+    break;
+  default:
+    mLsConnector.MezzanineType = MezzanineUnknown;
+  }
+
+  Status = gBS->InstallProtocolInterface (&ImageHandle,
+                  &g96BoardsLsConnectorProtocolGuid,
+                  EFI_NATIVE_INTERFACE,
+                  &mLsConnector);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = gBS->CreateEventEx (
+                  EVT_NOTIFY_SIGNAL,
+                  TPL_NOTIFY,
+                  ApplyDeviceTreeOverlay,
+                  NULL,
+                  &gEfiEndOfDxeEventGroupGuid,
+                  &EndOfDxeEvent);
+  ASSERT_EFI_ERROR (Status);
+
+  return InstallHiiPages ();
+}
diff --git a/Platform/96Boards/LsConnectorDxe/LsConnectorDxe.h 
b/Platform/96Boards/LsConnectorDxe/LsConnectorDxe.h
new file mode 100644
index 000000000000..c2a21c52b7a2
--- /dev/null
+++ b/Platform/96Boards/LsConnectorDxe/LsConnectorDxe.h
@@ -0,0 +1,32 @@
+/** @file
+
+  Copyright (c) 2018, Linaro Limited. 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.
+
+**/
+
+#ifndef __LSCONNECTOR_DXE_H__
+#define __LSCONNECTOR_DXE_H__
+
+#include <Guid/HiiPlatformSetupFormset.h>
+#include <Guid/FormSet.h>
+
+#define MEZZANINE_NONE                            0x0
+#define MEZZANINE_SECURE96                        0x1
+#define MEZZANINE_MAX                             0x2
+
+#define NINETY_SIX_BOARDS_CONFIG_VARIABLE_NAME    L"NinetySixBoardsConfig"
+
+typedef struct {
+  UINT8         MezzanineType;
+  UINT8         Reserved[7];
+} NINETY_SIX_BOARDS_CONFIG_DATA;
+
+#endif // __LSCONNECTOR_DXE_H__
diff --git a/Platform/96Boards/LsConnectorDxe/LsConnectorDxe.inf 
b/Platform/96Boards/LsConnectorDxe/LsConnectorDxe.inf
new file mode 100644
index 000000000000..1bf528ceaa84
--- /dev/null
+++ b/Platform/96Boards/LsConnectorDxe/LsConnectorDxe.inf
@@ -0,0 +1,57 @@
+## @file
+#
+#  Copyright (c) 2018, Linaro, Ltd. 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               = 0x0001001A
+  BASE_NAME                 = LsConnectorDxe
+  FILE_GUID                 = 3f68e889-cb77-4efc-bc84-afa0a64ad26e
+  MODULE_TYPE               = DXE_DRIVER
+  VERSION_STRING            = 1.0
+  ENTRY_POINT               = EntryPoint
+
+[Sources]
+  LsConnectorDxe.c
+  LsConnectorDxe.h
+  LsConnectorHii.vfr
+  LsConnectorHii.uni
+
+[Packages]
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  Platform/96Boards/96Boards.dec
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  HiiLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+  UefiLib
+  UefiRuntimeServicesTableLib
+
+[Protocols]
+  g96BoardsLsConnectorProtocolGuid     ## PRODUCES
+  g96BoardsMezzanineProtocolGuid       ## CONSUMES
+
+[Guids]
+  gEfiEndOfDxeEventGroupGuid
+  gFdtTableGuid
+  g96BoardsFormsetGuid
+
+[Depex]
+  gEfiVariableArchProtocolGuid        AND
+  gEfiVariableWriteArchProtocolGuid
diff --git a/Platform/96Boards/LsConnectorDxe/LsConnectorHii.uni 
b/Platform/96Boards/LsConnectorDxe/LsConnectorHii.uni
new file mode 100644
index 000000000000..23f4c5859207
--- /dev/null
+++ b/Platform/96Boards/LsConnectorDxe/LsConnectorHii.uni
@@ -0,0 +1,27 @@
+/** @file
+
+  Copyright (c) 2018, Linaro, 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.
+
+**/
+
+#langdef en-US  "English"
+
+#string STR_FORM_SET_TITLE             #language en-US "96boards Mezzanine 
options"
+#string STR_FORM_SET_TITLE_HELP        #language en-US "Configure the 
installed 96boards mezzanine"
+
+#string STR_MAIN_FORM_TITLE            #language en-US "96boards Mezzanine 
options"
+#string STR_NULL_STRING                #language en-US ""
+
+#string STR_MEZZANINE_SELECT_PROMPT    #language en-US "96boards mezzanine"
+#string STR_MEZZANINE_SELECT_HELP      #language en-US "The type of mezzanine 
board plugged into the 96boards LS connector"
+
+#string STR_MEZZANINE_NONE             #language en-US "None/Unknown"
+#string STR_MEZZANINE_SECURE96         #language en-US "Secure96"
diff --git a/Platform/96Boards/LsConnectorDxe/LsConnectorHii.vfr 
b/Platform/96Boards/LsConnectorDxe/LsConnectorHii.vfr
new file mode 100644
index 000000000000..c4dd69db8e2f
--- /dev/null
+++ b/Platform/96Boards/LsConnectorDxe/LsConnectorHii.vfr
@@ -0,0 +1,45 @@
+/** @file
+
+  Copyright (c) 2018, Linaro, 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 "LsConnectorDxe.h"
+
+#include <Uefi/UefiMultiPhase.h>
+
+formset
+  guid      = NINETY_SIX_BOARDS_FORMSET_GUID,
+  title     = STRING_TOKEN(STR_FORM_SET_TITLE),
+  help      = STRING_TOKEN(STR_FORM_SET_TITLE_HELP),
+  classguid = EFI_HII_PLATFORM_SETUP_FORMSET_GUID,
+
+  efivarstore NINETY_SIX_BOARDS_CONFIG_DATA,
+    attribute = EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_NON_VOLATILE,  
// EFI variable attributes
+    name  = NinetySixBoardsConfig,
+    guid  = NINETY_SIX_BOARDS_FORMSET_GUID;
+
+  form formid = 0x1000,
+    title  = STRING_TOKEN(STR_MAIN_FORM_TITLE);
+
+    oneof varid = NinetySixBoardsConfig.MezzanineType,
+        prompt      = STRING_TOKEN(STR_MEZZANINE_SELECT_PROMPT),
+        help        = STRING_TOKEN(STR_MEZZANINE_SELECT_HELP),
+        flags       = NUMERIC_SIZE_1 | INTERACTIVE | RESET_REQUIRED,
+        option text = STRING_TOKEN(STR_MEZZANINE_NONE), value = 
MEZZANINE_NONE, flags = DEFAULT;
+        option text = STRING_TOKEN(STR_MEZZANINE_SECURE96), value = 
MEZZANINE_SECURE96, flags = 0;
+    endoneof;
+
+    subtitle text = STRING_TOKEN(STR_NULL_STRING);
+
+  endform;
+
+endformset;
-- 
2.11.0

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