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* [Patch][edk2-platforms/devel-MinnowBoard3-UDK2017] SMBus Host driver.
@ 2018-02-13  5:55 zwei4
  0 siblings, 0 replies; only message in thread
From: zwei4 @ 2018-02-13  5:55 UTC (permalink / raw)
  To: edk2-devel

Add Apollo Lake SMBus host controller DXE driver.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: zwei4 <david.wei@intel.com>
---
 .../BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbus.h | 358 +++++++++++
 .../SouthCluster/Smbus/Dxe/PchSmbusArp.c           | 673 +++++++++++++++++++++
 .../SouthCluster/Smbus/Dxe/PchSmbusDxe.inf         |  63 ++
 .../SouthCluster/Smbus/Dxe/PchSmbusEntry.c         | 155 +++++
 4 files changed, 1249 insertions(+)
 create mode 100644 Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbus.h
 create mode 100644 Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusArp.c
 create mode 100644 Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusDxe.inf
 create mode 100644 Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusEntry.c

diff --git a/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbus.h b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbus.h
new file mode 100644
index 000000000..5e226a80d
--- /dev/null
+++ b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbus.h
@@ -0,0 +1,358 @@
+/** @file
+  PCH SMBus Protocol.
+
+  Copyright (c) 2018, 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.
+
+**/
+#ifndef _DXE_PCH_SMBUS_H
+#define _DXE_PCH_SMBUS_H
+
+#include <Uefi.h>
+#include <Library/UefiLib.h>
+#include <Library/BaseLib.h>
+#include <Protocol/SmbusHc.h>
+#include <Library/DebugLib.h>
+#include <PiDxe.h>
+#include <Library/HobLib.h>
+#include <Guid/HobList.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <ScAccess.h>
+#include <Private/Guid/ScPolicyHobGuid.h>
+#include <Private/Library/ScSmbusCommonLib.h>
+
+//
+// Definitions
+//
+
+///
+/// Max number of SMBus devices (7 bit address yields 128 combinations but 21 of those are reserved)
+///
+#define MAX_SMBUS_DEVICES 107
+#define MICROSECOND 10
+#define MILLISECOND (1000 * MICROSECOND)
+#define ONESECOND   (1000 * MILLISECOND)
+
+///
+/// Private Data Structures
+///
+typedef struct _SMBUS_NOTIFY_FUNCTION_LIST_NODE {
+  UINT32                    Signature;
+  LIST_ENTRY                Link;
+  EFI_SMBUS_DEVICE_ADDRESS  SlaveAddress;
+  UINTN                     Data;
+  EFI_SMBUS_NOTIFY_FUNCTION NotifyFunction;
+} SMBUS_NOTIFY_FUNCTION_LIST_NODE;
+
+#define SMBUS_NOTIFY_FUNCTION_LIST_NODE_FROM_LINK(_node) \
+  CR ( \
+  _node, \
+  SMBUS_NOTIFY_FUNCTION_LIST_NODE, \
+  Link, \
+  PCH_SMBUS_PRIVATE_DATA_SIGNATURE \
+  )
+
+///
+/// Declare a local instance structure for this driver
+///
+typedef struct _SMBUS_INSTANCE {
+  UINTN                 Signature;
+  EFI_HANDLE            Handle;
+
+  UINT32                SmbusIoBase;
+  SMBUS_IO_READ         SmbusIoRead;
+  SMBUS_IO_WRITE        SmbusIoWrite;
+  SMBUS_IO_DONE         IoDone;
+
+  ///
+  /// Published interface
+  ///
+  EFI_SMBUS_HC_PROTOCOL SmbusController;
+
+  UINT8                 DeviceMapEntries;
+  EFI_SMBUS_DEVICE_MAP  DeviceMap[MAX_SMBUS_DEVICES];
+
+  UINT8                 PlatformNumRsvd;
+  CONST UINT8           *PlatformRsvdAddr;
+
+  LIST_ENTRY            NotifyFunctionList;
+  EFI_EVENT             NotificationEvent;
+
+} SMBUS_INSTANCE;
+
+//
+// Driver global data
+//
+SMBUS_INSTANCE  *mSmbusContext;
+
+//
+// Prototypes
+//
+
+/**
+  Execute an SMBUS operation
+
+  @param[in] This                 The protocol instance
+  @param[in] SlaveAddress         The address of the SMBUS slave device
+  @param[in] Command              The SMBUS command
+  @param[in] Operation            Which SMBus protocol will be issued
+  @param[in] PecCheck             If Packet Error Code Checking is to be used
+  @param[in, out] Length          Length of dta
+  @param[in, out] Buffer          Data buffer
+
+  @retval EFI_SUCCESS             The SMBUS operation is successful
+  @retval Others                  Something error occurred
+**/
+EFI_STATUS
+EFIAPI
+SmbusExecute (
+  IN      CONST EFI_SMBUS_HC_PROTOCOL   *This,
+  IN      EFI_SMBUS_DEVICE_ADDRESS      SlaveAddress,
+  IN      EFI_SMBUS_DEVICE_COMMAND      Command,
+  IN      EFI_SMBUS_OPERATION           Operation,
+  IN      BOOLEAN                       PecCheck,
+  IN OUT  UINTN                         *Length,
+  IN OUT  VOID                          *Buffer
+  );
+
+/**
+  SMBus DXE Module Entry Point.
+  
+  - Introduction
+    The SMBus module is a DXE driver that provides a standard way to execute an SMBus command.
+
+  - @pre
+    - @link SC_POLICY SC_POLICY_HOB @endlink
+      - This module uses the parameters in SmbusConfig for platform reserved (non ARP capable) addresses.
+
+  - @result
+    The SMBus driver produces EFI_SMBUS_HC_PROTOCOL which is documented in the SMBus Host Controller
+    Protocol Specification.
+
+  @param[in] ImageHandle          ImageHandle of this module
+  @param[in] SystemTable          EFI System Table
+
+  @retval EFI_SUCCESS             Driver initializes successfully
+  @retval Others                  Some error occurred
+**/
+EFI_STATUS
+EFIAPI
+InitializePchSmbus (
+  IN  EFI_HANDLE                         ImageHandle,
+  IN  EFI_SYSTEM_TABLE                   *SystemTable
+  );
+
+/**
+  Set Slave address for an Smbus device with a known UDID or perform a general
+  ARP of all devices.
+
+  @param[in] This                 Pointer to the instance of the EFI_SMBUS_HC_PROTOCOL.
+  @param[in] ArpAll               If TRUE, do a full ARP. Otherwise, just ARP the specified UDID.
+  @param[in] SmbusUdid            When doing a directed ARP, ARP the device with this UDID.
+  @param[in, out] SlaveAddress   Buffer to store new Slave Address during directed ARP. On output,If
+                                  ArpAlll == TRUE, this will contain the newly assigned Slave address.
+
+  @retval EFI_SUCCESS             The function completed successfully
+  @retval EFI_INVALID_PARAMETER   ArpAll == FALSE but SmbusUdid or SlaveAddress are NULL.
+  @retval Others                  Return value from SmbusFullArp() or SmbusDirectedArp().
+**/
+EFI_STATUS
+EFIAPI
+SmbusArpDevice (
+  IN      CONST EFI_SMBUS_HC_PROTOCOL   *This,
+  IN      BOOLEAN                       ArpAll,
+  IN      EFI_SMBUS_UDID                * SmbusUdid, OPTIONAL
+  IN OUT  EFI_SMBUS_DEVICE_ADDRESS      * SlaveAddress OPTIONAL
+  );
+
+/**
+  Get a pointer to the assigned mappings of UDID's to Slave Addresses.
+
+  @param[in] This                 Pointer to the instance of the EFI_SMBUS_HC_PROTOCOL.
+  @param[in, out] Length          Buffer to contain the lenght of the Device Map, it will be updated to
+                                  contain the number of pairs of UDID's mapped to Slave Addresses.
+  @param[in, out] SmbusDeviceMap  Buffer to contian a pointer to the Device Map, it will be updated to
+                                  point to the first pair in the Device Map
+
+  @retval EFI_SUCCESS             Function completed successfully.
+**/
+EFI_STATUS
+EFIAPI
+SmbusGetArpMap (
+  IN      CONST EFI_SMBUS_HC_PROTOCOL   *This,
+  IN OUT  UINTN                         *Length,
+  IN OUT  EFI_SMBUS_DEVICE_MAP          **SmbusDeviceMap
+  );
+
+/**
+  Register a callback in the event of a Host Notify command being sent by a
+  specified Slave Device.
+
+  @param[in] This                 Pointer to the instance of the EFI_SMBUS_HC_PROTOCOL.
+  @param[in] SlaveAddress         Address of the device whose Host Notify command we want to
+                                  trap.
+  @param[in] Data                 Data of the Host Notify command we want to trap.
+  @param[in] NotifyFunction       Function to be called in the event the desired Host Notify
+                                  command occurs.
+
+  @retval EFI_UNSUPPORTED         Unable to create the event needed for notifications.
+  @retval EFI_INVALID_PARAMETER   NotifyFunction was NULL.
+  @retval EFI_OUT_OF_RESOURCES    Unable to allocate space to register the notification.
+  @retval EFI_SUCCESS             Function completed successfully
+**/
+EFI_STATUS
+EFIAPI
+SmbusNotify (
+  IN  CONST EFI_SMBUS_HC_PROTOCOL   *This,
+  IN  EFI_SMBUS_DEVICE_ADDRESS      SlaveAddress,
+  IN  UINTN                         Data,
+  IN  EFI_SMBUS_NOTIFY_FUNCTION     NotifyFunction
+  );
+
+/**
+  Set up a periodic event so that we can check if any Slave Device has sent a
+  Notify ARP Master command.
+
+  @retval EFI_SUCCESS             Periodic event successfully set up.
+  @retval Others                  Failed to set up Periodic event.
+                                  Error value from CreateEvent().
+                                  Error value from SetTimer().
+**/
+EFI_STATUS
+InitializePeriodicEvent (
+  VOID
+  );
+
+/**
+  Function to be called every time periodic event happens. This will check if
+  the SMBus Host Controller has received a Host Notify command. If so, it will
+  see if a notification has been reqested on that event and make any callbacks
+  that may be necessary.
+
+  @param[in] Event                The periodic event that occured and got us into this callback.
+  @param[in] Context              Event context. Will be NULL in this case, since we already have our
+                                  private data in a module global variable.
+**/
+VOID
+EFIAPI
+PollSmbusNotify (
+  IN  EFI_EVENT                         Event,
+  IN  VOID                              *Context
+  );
+
+/**
+  Issue a prepare ARP command to informs all devices that the ARP Master is starting the ARP process
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+
+  @retval EFI_SUCCESS             The SMBUS operation is successful
+  @retval Others                  Something error occurred
+**/
+EFI_STATUS
+SmbusPrepareToArp (
+  IN  SMBUS_INSTANCE                *Private
+  );
+
+/**
+  Issue a Get UDID (general) command to requests ARP-capable and/or Discoverable devices to
+  return their slave address along with their UDID.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in, out] DeviceMap       Pointer to SMBUS device map table that slave device return
+
+  @retval EFI_SUCCESS             The SMBUS operation is successful
+  @retval Others                  Something error occurred
+**/
+EFI_STATUS
+SmbusGetUdidGeneral (
+  IN      SMBUS_INSTANCE                *Private,
+  IN OUT  EFI_SMBUS_DEVICE_MAP          *DeviceMap
+  );
+
+/**
+  Issue a Assign address command to assigns an address to a specific slave device.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in, out] DeviceMap       Pointer to SMBUS device map table that send to slave device
+
+  @retval EFI_SUCCESS             The SMBUS operation is successful
+  @retval Others                  Something error occurred
+**/
+EFI_STATUS
+SmbusAssignAddress (
+  IN      SMBUS_INSTANCE                *Private,
+  IN OUT  EFI_SMBUS_DEVICE_MAP          *DeviceMap
+  );
+
+/**
+  Do a fully (general) Arp procress to assign the slave address of all ARP-capable device.
+  This function will issue the "Prepare to ARP", "Get UDID" and "Assign Address" commands.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+
+  @retval EFI_OUT_OF_RESOURCES    No available address to assign
+  @retval EFI_SUCCESS             The function completed successfully
+**/
+EFI_STATUS
+SmbusFullArp (
+  IN  SMBUS_INSTANCE                *Private
+  );
+
+/**
+  Do a directed Arp procress to assign the slave address of a single ARP-capable device.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in] SmbusUdid            When doing a directed ARP, ARP the device with this UDID.
+  @param[in, out] SlaveAddress    Buffer to store new Slave Address during directed ARP.
+
+  @retval EFI_OUT_OF_RESOURCES    DeviceMapEntries is more than Max number of SMBus devices
+                                  Or there is no available address to assign
+  @retval EFI_SUCCESS             The function completed successfully
+**/
+EFI_STATUS
+SmbusDirectedArp (
+  IN      SMBUS_INSTANCE                *Private,
+  IN      EFI_SMBUS_UDID                *SmbusUdid,
+  IN OUT  EFI_SMBUS_DEVICE_ADDRESS      *SlaveAddress
+  );
+
+/**
+  Find an available address to assign
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in, out] SlaveAddress    Buffer to store new Slave Address during directed ARP.
+
+  @retval EFI_OUT_OF_RESOURCES    There is no available address to assign
+  @retval EFI_SUCCESS             The function completed successfully
+**/
+EFI_STATUS
+GetNextAvailableAddress (
+  IN      SMBUS_INSTANCE                *Private,
+  IN OUT  EFI_SMBUS_DEVICE_ADDRESS      *SlaveAddress
+  );
+
+/**
+  Check whether the address is assignable.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in] SlaveAddress         The Slave Address for checking
+
+  @retval TRUE                    The address is assignable
+  @retval FALSE                   The address is not assignable
+**/
+BOOLEAN
+IsAddressAvailable (
+  IN  SMBUS_INSTANCE               *Private,
+  IN  EFI_SMBUS_DEVICE_ADDRESS     SlaveAddress
+  );
+
+#endif
diff --git a/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusArp.c b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusArp.c
new file mode 100644
index 000000000..7d616be8a
--- /dev/null
+++ b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusArp.c
@@ -0,0 +1,673 @@
+/** @file
+  PCH SMBus Driver, ARP functions.
+
+  Copyright (c) 2018, 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.
+
+**/
+#include "PchSmbus.h"
+
+///
+/// These addresses are reserved by the SMBus 2.0 specification
+///
+static UINT8  mReservedAddress[SMBUS_NUM_RESERVED] = {
+  0x00,
+  0x02,
+  0x04,
+  0x06,
+  0x08,
+  0x0A,
+  0x0C,
+  0x0E,
+  0x10,
+  0x18,
+  0x50,
+  0x6E,
+  0xC2,
+  0xF0,
+  0xF2,
+  0xF4,
+  0xF6,
+  0xF8,
+  0xFA,
+  0xFC,
+  0xFE,
+  0x12,
+  0x14,
+  0x16,
+  0x58,
+  0x5A,
+  0x80,
+  0x82,
+  0x84,
+  0x86,
+  0x88,
+  0x90,
+  0x92,
+  0x94,
+  0x96,
+  0x1A,
+  0x1C,
+  0x1E
+};
+
+/**
+  Set Slave address for an SMBus device with a known UDID or perform a general
+  ARP of all devices.
+
+  @param[in] This                 Pointer to the instance of the EFI_SMBUS_HC_PROTOCOL.
+  @param[in] ArpAll               If TRUE, do a full ARP. Otherwise, just ARP the specified UDID.
+  @param[in] SmbusUdid            When doing a directed ARP, ARP the device with this UDID.
+  @@param[in, out] SlaveAddress   Buffer to store new Slave Address during directed ARP. On output,If
+                                  ArpAlll == TRUE, this will contain the newly assigned Slave address.
+
+  @retval EFI_SUCCESS             The function completed successfully
+  @retval EFI_INVALID_PARAMETER   ArpAll == FALSE but SmbusUdid or SlaveAddress are NULL.
+  @retval Others                  Return value from SmbusFullArp() or SmbusDirectedArp().
+**/
+EFI_STATUS
+EFIAPI
+SmbusArpDevice (
+  IN      CONST EFI_SMBUS_HC_PROTOCOL   *This,
+  IN      BOOLEAN                       ArpAll,
+  IN      EFI_SMBUS_UDID                * SmbusUdid, OPTIONAL
+  IN OUT  EFI_SMBUS_DEVICE_ADDRESS      * SlaveAddress OPTIONAL
+  )
+{
+  DEBUG ((DEBUG_INFO, "SmbusArpDevice() Start\n"));
+
+  InitializeSmbusRegisters ();
+
+  DEBUG ((DEBUG_INFO, "SmbusArpDevice() End\n"));
+
+  if (ArpAll) {
+    return SmbusFullArp (mSmbusContext);
+  } else {
+    if ((SmbusUdid == NULL) || (SlaveAddress == NULL)) {
+      return EFI_INVALID_PARAMETER;
+    }
+
+    return SmbusDirectedArp (mSmbusContext, SmbusUdid, SlaveAddress);
+  }
+}
+
+/**
+  Get a pointer to the assigned mappings of UDID's to Slave Addresses.
+
+  @param[in] This                 Pointer to the instance of the EFI_SMBUS_HC_PROTOCOL.
+  @param[in, out] Length          Buffer to contain the lenght of the Device Map, it will be updated to
+                                  contain the number of pairs of UDID's mapped to Slave Addresses.
+  @param[in, out] SmbusDeviceMap  Buffer to contian a pointer to the Device Map, it will be updated to
+                                  point to the first pair in the Device Map
+
+  @retval EFI_SUCCESS             Function completed successfully.
+**/
+EFI_STATUS
+EFIAPI
+SmbusGetArpMap (
+  IN      CONST EFI_SMBUS_HC_PROTOCOL   *This,
+  IN OUT  UINTN                         *Length,
+  IN OUT  EFI_SMBUS_DEVICE_MAP          **SmbusDeviceMap
+  )
+{
+  *Length         = mSmbusContext->DeviceMapEntries * sizeof (EFI_SMBUS_DEVICE_MAP);
+  *SmbusDeviceMap = mSmbusContext->DeviceMap;
+  return EFI_SUCCESS;
+}
+
+/**
+  Register a callback in the event of a Host Notify command being sent by a
+  specified Slave Device.
+
+  @param[in] This                 Pointer to the instance of the EFI_SMBUS_HC_PROTOCOL.
+  @param[in] SlaveAddress         Address of the device whose Host Notify command we want to
+                                  trap.
+  @param[in] Data                 Data of the Host Notify command we want to trap.
+  @param[in] NotifyFunction       Function to be called in the event the desired Host Notify
+                                  command occurs.
+
+  @retval EFI_UNSUPPORTED         Unable to create the event needed for notifications.
+  @retval EFI_INVALID_PARAMETER   NotifyFunction was NULL.
+  @retval EFI_OUT_OF_RESOURCES    Unable to allocate space to register the notification.
+  @retval EFI_SUCCESS             Function completed successfully
+**/
+EFI_STATUS
+EFIAPI
+SmbusNotify (
+  IN      CONST EFI_SMBUS_HC_PROTOCOL   *This,
+  IN      EFI_SMBUS_DEVICE_ADDRESS      SlaveAddress,
+  IN      UINTN                         Data,
+  IN      EFI_SMBUS_NOTIFY_FUNCTION     NotifyFunction
+  )
+{
+  EFI_STATUS                      Status;
+  SMBUS_NOTIFY_FUNCTION_LIST_NODE *NewNode;
+
+  DEBUG ((DEBUG_INFO, "SmbusNotify() Start\n"));
+
+  if (NotifyFunction == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  NewNode = (SMBUS_NOTIFY_FUNCTION_LIST_NODE *) AllocatePool (sizeof (SMBUS_NOTIFY_FUNCTION_LIST_NODE));
+  if (NewNode == NULL) {
+    DEBUG ((DEBUG_ERROR, "Failed to allocate memory for NewNode! \n"));
+    return EFI_OUT_OF_RESOURCES;
+  }
+  //
+  // If this is the first notification request, start an event to periodically
+  // check for a Notify master command.
+  //
+  if (!mSmbusContext->NotificationEvent) {
+    Status = InitializePeriodicEvent ();
+    if (EFI_ERROR (Status)) {
+      FreePool (NewNode);
+      return EFI_UNSUPPORTED;
+    }
+  }
+
+  NewNode->Signature                        = PCH_SMBUS_PRIVATE_DATA_SIGNATURE;
+  NewNode->SlaveAddress.SmbusDeviceAddress  = SlaveAddress.SmbusDeviceAddress;
+  NewNode->Data = Data;
+  NewNode->NotifyFunction = NotifyFunction;
+
+  InsertTailList (&mSmbusContext->NotifyFunctionList, &NewNode->Link);
+
+  DEBUG ((DEBUG_INFO, "SmbusNotify() End\n"));
+  return EFI_SUCCESS;
+}
+
+/**
+  Set up a periodic event so that we can check if any Slave Device has sent a
+  Notify ARP Master command.
+
+  @retval EFI_SUCCESS             Periodic event successfully set up.
+  @retval Others                  Failed to set up Periodic event.
+                                  Error value from CreateEvent().
+                                  Error value from SetTimer().
+**/
+EFI_STATUS
+InitializePeriodicEvent (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = gBS->CreateEvent (
+                  (EVT_TIMER | EVT_NOTIFY_SIGNAL),
+                  TPL_CALLBACK,
+                  PollSmbusNotify,
+                  NULL,
+                  &mSmbusContext->NotificationEvent
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = gBS->SetTimer (
+                  mSmbusContext->NotificationEvent,
+                  TimerPeriodic,
+                  1000 * MILLISECOND
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Function to be called every time periodic event happens. This will check if
+  the SMBus Host Controller has received a Host Notify command. If so, it will
+  see if a notification has been reqested on that event and make any callbacks
+  that may be necessary.
+
+  @param[in] Event                The periodic event that occured and got us into this callback.
+  @param[in] Context              Event context. Will be NULL in this case, since we already have our
+                                  private data in a module global variable.
+**/
+VOID
+EFIAPI
+PollSmbusNotify (
+  IN  EFI_EVENT                   Event,
+  IN  VOID                        *Context
+  )
+{
+  LIST_ENTRY                      *Link;
+  EFI_SMBUS_DEVICE_ADDRESS        SlaveAddress;
+  SMBUS_NOTIFY_FUNCTION_LIST_NODE *Node;
+  UINT8                           SstsReg;
+  UINTN                           Data;
+
+  DEBUG ((DEBUG_INFO, "PollSmbusNotify() Start\n"));
+
+  InitializeSmbusRegisters ();
+
+  SstsReg = SmbusIoRead (R_SMBUS_SSTS);
+  if (!(SstsReg & B_SMBUS_HOST_NOTIFY_STS)) {
+    //
+    // Host Notify has not been received
+    //
+    return;
+  }
+  
+  //
+  // There was a Host Notify, see if any one wants to know about it
+  //
+  SlaveAddress.SmbusDeviceAddress = (SmbusIoRead (R_SMBUS_NDA)) >> 1;
+
+  Link = GetFirstNode (&mSmbusContext->NotifyFunctionList);
+
+  while (!IsNull (&mSmbusContext->NotifyFunctionList, Link)) {
+    Node = SMBUS_NOTIFY_FUNCTION_LIST_NODE_FROM_LINK (Link);
+
+    if (Node->SlaveAddress.SmbusDeviceAddress == SlaveAddress.SmbusDeviceAddress) {
+      Data = (SmbusIoRead (R_SMBUS_NDHB) << 8) + (SmbusIoRead (R_SMBUS_NDLB));
+      if ((UINT16) Node->Data == (UINT16) Data) {
+        //
+        // We have a match, notify the requested function
+        //
+        Node->NotifyFunction (SlaveAddress, Data);
+      }
+    }
+
+    Link = GetNextNode (&mSmbusContext->NotifyFunctionList, &Node->Link);
+  }
+  
+  //
+  // Clear the Notify Status bit and exit.
+  //
+  SmbusIoWrite (R_SMBUS_SSTS, B_SMBUS_HOST_NOTIFY_STS);
+
+  DEBUG ((DEBUG_INFO, "PollSmbusNotify() End\n"));
+
+  return;
+}
+
+/**
+  Issue a prepare ARP command to informs all devices that the ARP Master is starting the ARP process
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+
+  @retval EFI_SUCCESS             The SMBUS operation is successful
+  @retval Others                  Something error occurred
+**/
+EFI_STATUS
+SmbusPrepareToArp (
+  IN  SMBUS_INSTANCE        *Private
+  )
+{
+  EFI_SMBUS_DEVICE_ADDRESS  SlaveAddress;
+  EFI_STATUS                Status;
+  UINTN                     Length;
+  UINT8                     Buffer;
+
+  DEBUG ((DEBUG_INFO, "SmbusPrepareToArp() Start\n"));
+
+  SlaveAddress.SmbusDeviceAddress = SMBUS_ADDRESS_ARP;
+  Length                          = 1;
+  Buffer                          = SMBUS_DATA_PREPARE_TO_ARP;
+
+  Status = SmbusExec (
+            SlaveAddress,
+            0,
+            EfiSmbusSendByte,
+            TRUE,
+            &Length,
+            &Buffer
+            );
+
+  DEBUG ((DEBUG_INFO, "SmbusPrepareToArp() End\n"));
+
+  return Status;
+}
+
+/**
+  Issue a Get UDID (general) command to requests ARP-capable and/or Discoverable devices to
+  return their slave address along with their UDID.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in, out] DeviceMap       Pointer to SMBUS device map table that slave device return
+
+  @retval EFI_SUCCESS             The SMBUS operation is successful
+  @retval Others                  Something error occurred
+**/
+EFI_STATUS
+SmbusGetUdidGeneral (
+  IN      SMBUS_INSTANCE        *Private,
+  IN OUT  EFI_SMBUS_DEVICE_MAP  *DeviceMap
+  )
+{
+  EFI_SMBUS_DEVICE_ADDRESS  SlaveAddress;
+  EFI_STATUS                Status;
+  UINTN                     Length;
+  UINT8                     Buffer[SMBUS_GET_UDID_LENGTH];
+
+  DEBUG ((DEBUG_INFO, "SmbusGetUdidGeneral() Start\n"));
+
+  SlaveAddress.SmbusDeviceAddress = SMBUS_ADDRESS_ARP;
+  Length                          = SMBUS_GET_UDID_LENGTH;
+
+  Status = SmbusExec (
+            SlaveAddress,
+            SMBUS_DATA_GET_UDID_GENERAL,
+            EfiSmbusReadBlock,
+            TRUE,
+            &Length,
+            Buffer
+            );
+
+  if (!EFI_ERROR (Status)) {
+    if (Length == SMBUS_GET_UDID_LENGTH) {
+      DeviceMap->SmbusDeviceUdid.DeviceCapabilities = Buffer[0];
+      DeviceMap->SmbusDeviceUdid.VendorRevision     = Buffer[1];
+      DeviceMap->SmbusDeviceUdid.VendorId           = (UINT16) ((Buffer[2] << 8) + Buffer[3]);
+      DeviceMap->SmbusDeviceUdid.DeviceId           = (UINT16) ((Buffer[4] << 8) + Buffer[5]);
+      DeviceMap->SmbusDeviceUdid.Interface          = (UINT16) ((Buffer[6] << 8) + Buffer[7]);
+      DeviceMap->SmbusDeviceUdid.SubsystemVendorId  = (UINT16) ((Buffer[8] << 8) + Buffer[9]);
+      DeviceMap->SmbusDeviceUdid.SubsystemDeviceId  = (UINT16) ((Buffer[10] << 8) + Buffer[11]);
+      DeviceMap->SmbusDeviceUdid.VendorSpecificId = (UINT32) ((Buffer[12] << 24) + (Buffer[13] << 16) + (Buffer[14] << 8) + Buffer[15]);
+      DeviceMap->SmbusDeviceAddress.SmbusDeviceAddress = (UINT8) (Buffer[16] >> 1);
+    } else {
+      Status = EFI_DEVICE_ERROR;
+    }
+  }
+
+  DEBUG ((DEBUG_INFO, "SmbusGetUdidGeneral() End\n"));
+
+  return Status;
+}
+
+/**
+  Issue a Assign address command to assigns an address to a specific slave device.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in, out] DeviceMap       Pointer to SMBus device map table that send to slave device
+
+  @retval EFI_SUCCESS             The SMBus operation is successful
+  @retval Others                  Something error occurred
+**/
+EFI_STATUS
+SmbusAssignAddress (
+  IN      SMBUS_INSTANCE        *Private,
+  IN OUT  EFI_SMBUS_DEVICE_MAP  *DeviceMap
+  )
+{
+  EFI_SMBUS_DEVICE_ADDRESS  SlaveAddress;
+  EFI_STATUS                Status;
+  UINTN                     Length;
+  UINT8                     Buffer[SMBUS_GET_UDID_LENGTH];
+
+  DEBUG ((DEBUG_INFO, "SmbusAssignAddress() Start\n"));
+
+  Buffer[0] = DeviceMap->SmbusDeviceUdid.DeviceCapabilities;
+  Buffer[1] = DeviceMap->SmbusDeviceUdid.VendorRevision;
+  Buffer[2] = (UINT8) (DeviceMap->SmbusDeviceUdid.VendorId >> 8);
+  Buffer[3] = (UINT8) (DeviceMap->SmbusDeviceUdid.VendorId);
+  Buffer[4] = (UINT8) (DeviceMap->SmbusDeviceUdid.DeviceId >> 8);
+  Buffer[5] = (UINT8) (DeviceMap->SmbusDeviceUdid.DeviceId);
+  Buffer[6] = (UINT8) (DeviceMap->SmbusDeviceUdid.Interface >> 8);
+  Buffer[7] = (UINT8) (DeviceMap->SmbusDeviceUdid.Interface);
+  Buffer[8] = (UINT8) (DeviceMap->SmbusDeviceUdid.SubsystemVendorId >> 8);
+  Buffer[9] = (UINT8) (DeviceMap->SmbusDeviceUdid.SubsystemVendorId);
+  Buffer[10] = (UINT8) (DeviceMap->SmbusDeviceUdid.SubsystemDeviceId >> 8);
+  Buffer[11] = (UINT8) (DeviceMap->SmbusDeviceUdid.SubsystemDeviceId);
+  Buffer[12] = (UINT8) (DeviceMap->SmbusDeviceUdid.VendorSpecificId >> 24);
+  Buffer[13] = (UINT8) (DeviceMap->SmbusDeviceUdid.VendorSpecificId >> 16);
+  Buffer[14] = (UINT8) (DeviceMap->SmbusDeviceUdid.VendorSpecificId >> 8);
+  Buffer[15] = (UINT8) (DeviceMap->SmbusDeviceUdid.VendorSpecificId);
+  Buffer[16] = (UINT8) (DeviceMap->SmbusDeviceAddress.SmbusDeviceAddress << 1);
+
+  SlaveAddress.SmbusDeviceAddress = SMBUS_ADDRESS_ARP;
+  Length                          = SMBUS_GET_UDID_LENGTH;
+
+  Status = SmbusExec (
+            SlaveAddress,
+            SMBUS_DATA_ASSIGN_ADDRESS,
+            EfiSmbusWriteBlock,
+            TRUE,
+            &Length,
+            Buffer
+            );
+
+  DEBUG ((DEBUG_INFO, "SmbusAssignAddress() End\n"));
+
+  return Status;
+}
+
+/**
+  Do a fully (general) Arp procress to assign the slave address of all ARP-capable device.
+  This function will issue issue the "Prepare to ARP", "Get UDID" and "Assign Address" commands.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+
+  @retval EFI_OUT_OF_RESOURCES    No available address to assign
+  @retval EFI_SUCCESS             The function completed successfully
+**/
+EFI_STATUS
+SmbusFullArp (
+  IN      SMBUS_INSTANCE  *Private
+  )
+{
+  EFI_STATUS            Status;
+  EFI_SMBUS_DEVICE_MAP  *CurrentDeviceMap;
+
+  DEBUG ((DEBUG_INFO, "SmbusFullArp() Start\n"));
+
+  Status = SmbusPrepareToArp (Private);
+  if (EFI_ERROR (Status)) {
+    if (Status == EFI_DEVICE_ERROR) {
+      //
+      //  ARP is complete
+      //
+      return EFI_SUCCESS;
+    } else {
+      return Status;
+    }
+  }
+  //
+  //  Main loop to ARP all ARP-capable devices
+  //
+  do {
+    CurrentDeviceMap  = &Private->DeviceMap[Private->DeviceMapEntries];
+    Status            = SmbusGetUdidGeneral (Private, CurrentDeviceMap);
+    if (EFI_ERROR (Status)) {
+      break;
+    }
+
+    if (CurrentDeviceMap->SmbusDeviceAddress.SmbusDeviceAddress == (0xFF >> 1)) {
+      //
+      // If address is unassigned, assign it
+      //
+      Status = GetNextAvailableAddress (
+                Private,
+                &CurrentDeviceMap->SmbusDeviceAddress
+                );
+      if (EFI_ERROR (Status)) {
+        return EFI_OUT_OF_RESOURCES;
+      }
+    } else if (((CurrentDeviceMap->SmbusDeviceUdid.DeviceCapabilities) & 0xC0) != 0) {
+      //
+      // if address is not fixed, check if the current address is available
+      //
+      if (!IsAddressAvailable (
+            Private,
+            CurrentDeviceMap->SmbusDeviceAddress
+            )) {
+        //
+        // if currently assigned address is already used, get a new one
+        //
+        Status = GetNextAvailableAddress (
+                  Private,
+                  &CurrentDeviceMap->SmbusDeviceAddress
+                  );
+        if (EFI_ERROR (Status)) {
+          return EFI_OUT_OF_RESOURCES;
+        }
+      }
+    }
+
+    Status = SmbusAssignAddress (Private, CurrentDeviceMap);
+    if (EFI_ERROR (Status)) {
+      //
+      // If there was a device error, just continue on and try again.
+      // Other errors should be reported.
+      //
+      if (Status != EFI_DEVICE_ERROR) {
+        return Status;
+      }
+    } else {
+      //
+      // If there was no error, the address was assigned and we must update our
+      // records.
+      //
+      Private->DeviceMapEntries++;
+    }
+
+  } while (Private->DeviceMapEntries < MAX_SMBUS_DEVICES);
+
+  DEBUG ((DEBUG_INFO, "SmbusFullArp() End\n"));
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Do a directed Arp procress to assign the slave address of a single ARP-capable device.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in] SmbusUdid            When doing a directed ARP, ARP the device with this UDID.
+  @param[in, out] SlaveAddress    Buffer to store new Slave Address during directed ARP.
+
+  @retval EFI_OUT_OF_RESOURCES    DeviceMapEntries is more than Max number of SMBus devices
+                                  Or there is no available address to assign
+  @retval EFI_SUCCESS             The function completed successfully
+**/
+EFI_STATUS
+SmbusDirectedArp (
+  IN      SMBUS_INSTANCE            *Private,
+  IN      EFI_SMBUS_UDID            *SmbusUdid,
+  IN OUT  EFI_SMBUS_DEVICE_ADDRESS  *SlaveAddress
+  )
+{
+  EFI_STATUS            Status;
+  EFI_SMBUS_DEVICE_MAP  *CurrentDeviceMap;
+
+  DEBUG ((DEBUG_INFO, "SmbusDirectedArp() Start\n"));
+
+  if (Private->DeviceMapEntries >= MAX_SMBUS_DEVICES) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  CurrentDeviceMap = &Private->DeviceMap[Private->DeviceMapEntries];
+
+  //
+  // Find an available address to assign
+  //
+  Status = GetNextAvailableAddress (
+            Private,
+            &CurrentDeviceMap->SmbusDeviceAddress
+            );
+  if (EFI_ERROR (Status)) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  CurrentDeviceMap->SmbusDeviceUdid.DeviceCapabilities  = SmbusUdid->DeviceCapabilities;
+  CurrentDeviceMap->SmbusDeviceUdid.DeviceId            = SmbusUdid->DeviceId;
+  CurrentDeviceMap->SmbusDeviceUdid.Interface           = SmbusUdid->Interface;
+  CurrentDeviceMap->SmbusDeviceUdid.SubsystemDeviceId   = SmbusUdid->SubsystemDeviceId;
+  CurrentDeviceMap->SmbusDeviceUdid.SubsystemVendorId   = SmbusUdid->SubsystemVendorId;
+  CurrentDeviceMap->SmbusDeviceUdid.VendorId            = SmbusUdid->VendorId;
+  CurrentDeviceMap->SmbusDeviceUdid.VendorRevision      = SmbusUdid->VendorRevision;
+  CurrentDeviceMap->SmbusDeviceUdid.VendorSpecificId    = SmbusUdid->VendorSpecificId;
+
+  Status = SmbusAssignAddress (Private, CurrentDeviceMap);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Private->DeviceMapEntries++;
+  SlaveAddress->SmbusDeviceAddress = CurrentDeviceMap->SmbusDeviceAddress.SmbusDeviceAddress;
+
+  DEBUG ((DEBUG_INFO, "SmbusDirectedArp() End\n"));
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Find an available address to assign
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in, out] SlaveAddress    Buffer to store new Slave Address during directed ARP.
+
+  @retval EFI_OUT_OF_RESOURCES    There is no available address to assign
+  @retval EFI_SUCCESS             The function completed successfully
+**/
+EFI_STATUS
+GetNextAvailableAddress (
+  IN     SMBUS_INSTANCE            *Private,
+  IN OUT EFI_SMBUS_DEVICE_ADDRESS  *SlaveAddress
+  )
+{
+  for (SlaveAddress->SmbusDeviceAddress = 0x03;
+       SlaveAddress->SmbusDeviceAddress < 0x7F;
+       SlaveAddress->SmbusDeviceAddress++
+      ) {
+    if (IsAddressAvailable (Private, *SlaveAddress)) {
+      return EFI_SUCCESS;
+    }
+  }
+
+  return EFI_OUT_OF_RESOURCES;
+}
+
+/**
+  Check whether the address is assignable.
+
+  @param[in] Private              Pointer to the SMBUS_INSTANCE
+  @param[in] SlaveAddress         The Slave Address for checking
+
+  @retval TRUE                    The address is assignable
+  @retval FALSE                   The address is not assignable
+**/
+BOOLEAN
+IsAddressAvailable (
+  IN SMBUS_INSTANCE              *Private,
+  IN EFI_SMBUS_DEVICE_ADDRESS    SlaveAddress
+  )
+{
+  UINT8 Index;
+
+  //
+  // See if we have already assigned this address to a device
+  //
+  for (Index = 0; Index < Private->DeviceMapEntries; Index++) {
+    if (SlaveAddress.SmbusDeviceAddress == Private->DeviceMap[Index].SmbusDeviceAddress.SmbusDeviceAddress) {
+      return FALSE;
+    }
+  }
+  //
+  // See if this address is claimed by a platform non-ARP-capable device
+  //
+  for (Index = 0; Index < Private->PlatformNumRsvd; Index++) {
+    if ((SlaveAddress.SmbusDeviceAddress << 1) == Private->PlatformRsvdAddr[Index]) {
+      return FALSE;
+    }
+  }
+  //
+  // See if this is a reserved address
+  //
+  for (Index = 0; Index < SMBUS_NUM_RESERVED; Index++) {
+    if ((SlaveAddress.SmbusDeviceAddress << 1) == (UINTN) mReservedAddress[Index]) {
+      return FALSE;
+    }
+  }
+
+  return TRUE;
+}
diff --git a/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusDxe.inf b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusDxe.inf
new file mode 100644
index 000000000..ef083d09b
--- /dev/null
+++ b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusDxe.inf
@@ -0,0 +1,63 @@
+## @file
+#  SMBus driver.
+#
+#  Copyright (c) 2018, 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                      = ScSmbusDxe
+  FILE_GUID                      = E052D8A6-224A-4c32-8D37-2E0AE162364D
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = InitializeScSmbus
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 EBC
+
+[Sources]
+  PchSmbusEntry.c
+  PchSmbus.h
+  PchSmbusArp.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  BroxtonSiPkg/BroxtonSiPkg.dec
+  BroxtonSiPkg/BroxtonSiPrivate.dec
+
+[LibraryClasses]
+  UefiDriverEntryPoint
+  IoLib
+  BaseLib
+  DebugLib
+  TimerLib
+  UefiBootServicesTableLib
+  ScPlatformLib
+  UefiLib
+  HobLib
+  BaseMemoryLib
+  ScSmbusCommonLib
+  ConfigBlockLib
+
+[Protocols]
+  gEfiSmbusHcProtocolGuid ## PRODUCES
+
+[Guids]
+  gEfiSmbusArpMapGuid     ## UNDEFINED
+  gEfiHobListGuid         ## UNDEFINED
+  gScPolicyHobGuid        ## UNDEFINED
+  gSmbusConfigGuid
+
+[Depex]
+  TRUE
\ No newline at end of file
diff --git a/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusEntry.c b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusEntry.c
new file mode 100644
index 000000000..6ae16f343
--- /dev/null
+++ b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Smbus/Dxe/PchSmbusEntry.c
@@ -0,0 +1,155 @@
+/** @file
+  PCH SMBus Driver.
+
+  Copyright (c) 2018, 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.
+
+**/
+#include "PchSmbus.h"
+#include <Library/ConfigBlockLib.h>
+
+extern EFI_GUID gEfiSmbusArpMapGuid;
+
+/**
+  Execute an SMBus operation
+
+  @param[in] This                 The protocol instance
+  @param[in] SlaveAddress         The address of the SMBUS slave device
+  @param[in] Command              The SMBUS command
+  @param[in] Operation            Which SMBus protocol will be issued
+  @param[in] PecCheck             If Packet Error Code Checking is to be used
+  @param[in, out] Length          Length of data
+  @param[in, out] Buffer          Data buffer
+
+  @retval EFI_SUCCESS             The SMBUS operation is successful
+  @retval Others                  Something error occurred
+**/
+EFI_STATUS
+EFIAPI
+SmbusExecute (
+  IN      CONST EFI_SMBUS_HC_PROTOCOL   *This,
+  IN      EFI_SMBUS_DEVICE_ADDRESS      SlaveAddress,
+  IN      EFI_SMBUS_DEVICE_COMMAND      Command,
+  IN      EFI_SMBUS_OPERATION           Operation,
+  IN      BOOLEAN                       PecCheck,
+  IN OUT  UINTN                         *Length,
+  IN OUT  VOID                          *Buffer
+  )
+{
+  DEBUG ((DEBUG_INFO, "SmbusExecute() Start, SmbusDeviceAddress=%x, Command=%x, Operation=%x\n", (SlaveAddress.SmbusDeviceAddress << 1), Command, Operation));
+  InitializeSmbusRegisters ();
+
+  return SmbusExec (
+          SlaveAddress,
+          Command,
+          Operation,
+          PecCheck,
+          Length,
+          Buffer
+          );
+}
+
+/**
+  <b>SMBus DXE Module Entry Point</b>\n
+  - <b>Introduction</b>\n
+    The SMBus module is a DXE driver that provides a standard way to execute an SMBus command.
+
+  - @pre
+    - @link SC_POLICY SC_POLICY_HOB @endlink
+      - This module uses the parameters in SmbusConfig for platform reserved (non ARP capable) addresses.
+
+  - @result
+    The SMBus driver produces EFI_SMBUS_HC_PROTOCOL which is documented in the SMBus Host Controller
+    Protocol Specification.
+
+  @param[in] ImageHandle          ImageHandle of this module
+  @param[in] SystemTable          EFI System Table
+
+  @retval EFI_SUCCESS             Driver initializes successfully
+  @retval Others                  Some error occurred
+**/
+EFI_STATUS
+EFIAPI
+InitializeScSmbus (
+  IN      EFI_HANDLE            ImageHandle,
+  IN      EFI_SYSTEM_TABLE      *SystemTable
+  )
+{
+  SC_POLICY_HOB           *ScPolicy;
+  EFI_STATUS               Status;
+  UINTN                    DataSize;
+  VOID                     *Data;
+  EFI_PEI_HOB_POINTERS     HobList;
+  SC_SMBUS_CONFIG          *SmbusConfig;
+
+  DEBUG ((DEBUG_INFO, "InitializeScSmbus() Start\n"));
+
+  HobList.Guid = GetFirstGuidHob (&gScPolicyHobGuid);
+  ASSERT (HobList.Guid != NULL);
+  ScPolicy = GET_GUID_HOB_DATA (HobList.Guid);
+  Status   = GetConfigBlock ((VOID *) ScPolicy, &gSmbusConfigGuid, (VOID *) &SmbusConfig);
+  ASSERT_EFI_ERROR (Status);
+
+  mSmbusContext = AllocateZeroPool (sizeof (SMBUS_INSTANCE));
+  if (mSmbusContext == NULL) {
+    ASSERT (FALSE);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  mSmbusContext->Signature                  = PCH_SMBUS_PRIVATE_DATA_SIGNATURE;
+  mSmbusContext->IoDone                     = IoDone;
+  mSmbusContext->SmbusIoRead                = SmbusIoRead;
+  mSmbusContext->SmbusIoWrite               = SmbusIoWrite;
+  mSmbusContext->SmbusController.Execute    = SmbusExecute;
+  mSmbusContext->SmbusController.ArpDevice  = SmbusArpDevice;
+  mSmbusContext->SmbusController.GetArpMap  = SmbusGetArpMap;
+  mSmbusContext->SmbusController.Notify     = SmbusNotify;
+  mSmbusContext->PlatformNumRsvd            = SmbusConfig->NumRsvdSmbusAddresses;
+  mSmbusContext->PlatformRsvdAddr           = SmbusConfig->RsvdSmbusAddressTable;
+  ASSERT (mSmbusContext->PlatformNumRsvd <= SC_MAX_SMBUS_RESERVED_ADDRESS);
+
+  //
+  // See if PEI already ARPed any devices, and if so, update our device map.
+  //
+  // Get Hob list
+  //
+  Status = EfiGetSystemConfigurationTable (&gEfiHobListGuid, (VOID **) &HobList.Raw);
+  ASSERT_EFI_ERROR (Status);
+
+  HobList.Raw = GetNextGuidHob (&gEfiSmbusArpMapGuid, HobList.Raw);
+  //
+  // If we found the right hob, store the information. Otherwise, continue.
+  //
+  if (HobList.Raw != NULL) {
+    Data      = (VOID *) ((UINT8 *) (&HobList.Guid->Name) + sizeof (EFI_GUID));
+    DataSize  = HobList.Header->HobLength - sizeof (EFI_HOB_GUID_TYPE);
+    CopyMem (mSmbusContext->DeviceMap, Data, DataSize);
+    mSmbusContext->DeviceMapEntries = (UINT8) (DataSize / sizeof (EFI_SMBUS_DEVICE_MAP));
+  }
+  //
+  // Initialize the NotifyFunctionList
+  //
+  InitializeListHead (&mSmbusContext->NotifyFunctionList);
+
+  //
+  // Install the SMBus interface
+  //
+  Status = gBS->InstallMultipleProtocolInterfaces (
+                  &mSmbusContext->Handle,
+                  &gEfiSmbusHcProtocolGuid,
+                  &mSmbusContext->SmbusController,
+                  NULL
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+  DEBUG ((DEBUG_INFO, "InitializeScSmbus() End\n"));
+
+  return EFI_SUCCESS;
+}
-- 
2.14.1.windows.1



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