[PATCH edk2-platforms v5 3/6] Silicon/Socionext: implement I2C master protocol for SynQuacer I2C

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

Add a driver that produces the I2C master protocol on top of the I2C
controllers that are implemented in the SynQuacer Socionext SoC. Note
that this supports two modes simultaneously: I2C controllers that are
only usable at boot time, and usable via the I2C protocol stack, and
I2C controllers that are dedicated for the RTC or other runtime
components.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
v5: fix spurious copy/paste reference to USB
    rename __DEBUG to BOOTTIME_DEBUG
    use parentheses to refer to preprocessor macro arguments

 Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/ComponentName.c     | 185 ++++++
 Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/DriverBinding.c     | 238 ++++++++
 Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.c   | 588 ++++++++++++++++++++
 Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.h   | 162 ++++++
 Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.inf |  59 ++
 Silicon/Socionext/SynQuacer/SynQuacer.dec                               |   5 +
 6 files changed, 1237 insertions(+)

diff --git a/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/ComponentName.c b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/ComponentName.c
new file mode 100644
index 000000000000..8d7aa417505b
--- /dev/null
+++ b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/ComponentName.c
@@ -0,0 +1,185 @@
+/** @file
+
+  Copyright (c) 2017, 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 "SynQuacerI2cDxe.h"
+
+STATIC EFI_UNICODE_STRING_TABLE mSynQuacerI2cDriverNameTable[] = {
+  {
+    "en",
+    (CHAR16 *)L"Socionext SynQuacer I2C Driver"
+  },
+  { }
+};
+
+STATIC EFI_UNICODE_STRING_TABLE mSynQuacerI2cControllerNameTable[] = {
+  {
+    "en",
+    (CHAR16 *)L"Socionext SynQuacer I2C Controller"
+  },
+  { }
+};
+
+/**
+  Retrieves a Unicode string that is the user readable name of the driver.
+
+  This function retrieves the user readable name of a driver in the form of a
+  Unicode string. If the driver specified by This has a user readable name in
+  the language specified by Language, then a pointer to the driver name is
+  returned in DriverName, and EFI_SUCCESS is returned. If the driver specified
+  by This does not support the language specified by Language,
+  then EFI_UNSUPPORTED is returned.
+
+  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
+                                EFI_COMPONENT_NAME_PROTOCOL instance.
+
+  @param  Language[in]          A pointer to a Null-terminated ASCII string
+                                array indicating the language. This is the
+                                language of the driver name that the caller is
+                                requesting, and it must match one of the
+                                languages specified in SupportedLanguages. The
+                                number of languages supported by a driver is up
+                                to the driver writer. Language is specified
+                                in RFC 4646 or ISO 639-2 language code format.
+
+  @param  DriverName[out]       A pointer to the Unicode string to return.
+                                This Unicode string is the name of the
+                                driver specified by This in the language
+                                specified by Language.
+
+  @retval EFI_SUCCESS           The Unicode string for the Driver specified by
+                                This and the language specified by Language was
+                                returned in DriverName.
+
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+
+  @retval EFI_INVALID_PARAMETER DriverName is NULL.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support
+                                the language specified by Language.
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SynQuacerI2cGetDriverName (
+  IN  EFI_COMPONENT_NAME2_PROTOCOL  *This,
+  IN  CHAR8                         *Language,
+  OUT CHAR16                        **DriverName
+  )
+{
+  return LookupUnicodeString2 (Language,
+                               This->SupportedLanguages,
+                               mSynQuacerI2cDriverNameTable,
+                               DriverName,
+                               FALSE);
+}
+
+/**
+  Retrieves a Unicode string that is the user readable name of the controller
+  that is being managed by a driver.
+
+  This function retrieves the user readable name of the controller specified by
+  ControllerHandle and ChildHandle in the form of a Unicode string. If the
+  driver specified by This has a user readable name in the language specified by
+  Language, then a pointer to the controller name is returned in ControllerName,
+  and EFI_SUCCESS is returned.  If the driver specified by This is not currently
+  managing the controller specified by ControllerHandle and ChildHandle,
+  then EFI_UNSUPPORTED is returned.  If the driver specified by This does not
+  support the language specified by Language, then EFI_UNSUPPORTED is returned.
+
+  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
+                                EFI_COMPONENT_NAME_PROTOCOL instance.
+
+  @param  ControllerHandle[in]  The handle of a controller that the driver
+                                specified by This is managing.  This handle
+                                specifies the controller whose name is to be
+                                returned.
+
+  @param  ChildHandle[in]       The handle of the child controller to retrieve
+                                the name of.  This is an optional parameter that
+                                may be NULL.  It will be NULL for device
+                                drivers.  It will also be NULL for a bus drivers
+                                that wish to retrieve the name of the bus
+                                controller.  It will not be NULL for a bus
+                                driver that wishes to retrieve the name of a
+                                child controller.
+
+  @param  Language[in]          A pointer to a Null-terminated ASCII string
+                                array indicating the language.  This is the
+                                language of the driver name that the caller is
+                                requesting, and it must match one of the
+                                languages specified in SupportedLanguages. The
+                                number of languages supported by a driver is up
+                                to the driver writer. Language is specified in
+                                RFC 4646 or ISO 639-2 language code format.
+
+  @param  ControllerName[out]   A pointer to the Unicode string to return.
+                                This Unicode string is the name of the
+                                controller specified by ControllerHandle and
+                                ChildHandle in the language specified by
+                                Language from the point of view of the driver
+                                specified by This.
+
+  @retval EFI_SUCCESS           The Unicode string for the user readable name in
+                                the language specified by Language for the
+                                driver specified by This was returned in
+                                DriverName.
+
+  @retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
+
+  @retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid
+                                EFI_HANDLE.
+
+  @retval EFI_INVALID_PARAMETER Language is NULL.
+
+  @retval EFI_INVALID_PARAMETER ControllerName is NULL.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This is not currently
+                                managing the controller specified by
+                                ControllerHandle and ChildHandle.
+
+  @retval EFI_UNSUPPORTED       The driver specified by This does not support
+                                the language specified by Language.
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SynQuacerI2cGetControllerName (
+  IN  EFI_COMPONENT_NAME2_PROTOCOL                    *This,
+  IN  EFI_HANDLE                                      ControllerHandle,
+  IN  EFI_HANDLE                                      ChildHandle        OPTIONAL,
+  IN  CHAR8                                           *Language,
+  OUT CHAR16                                          **ControllerName
+  )
+{
+  if (ChildHandle != NULL) {
+    return EFI_UNSUPPORTED;
+  }
+
+  return LookupUnicodeString2 (Language,
+                               This->SupportedLanguages,
+                               mSynQuacerI2cControllerNameTable,
+                               ControllerName,
+                               FALSE);
+}
+
+//
+// EFI Component Name 2 Protocol
+//
+EFI_COMPONENT_NAME2_PROTOCOL gSynQuacerI2cDriverComponentName2 = {
+  SynQuacerI2cGetDriverName,
+  SynQuacerI2cGetControllerName,
+  "en"
+};
diff --git a/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/DriverBinding.c b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/DriverBinding.c
new file mode 100644
index 000000000000..07bc13849381
--- /dev/null
+++ b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/DriverBinding.c
@@ -0,0 +1,238 @@
+/** @file
+
+  Copyright (c) 2017, 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.
+
+**/
+
+#include "SynQuacerI2cDxe.h"
+
+/**
+  Tests to see if this driver supports a given controller.
+
+  @param  This[in]                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL
+                                   instance.
+  @param  ControllerHandle[in]     The handle of the controller to test.
+  @param  RemainingDevicePath[in]  The remaining device path.
+                                   (Ignored - this is not a bus driver.)
+
+  @retval EFI_SUCCESS              The driver supports this controller.
+  @retval EFI_ALREADY_STARTED      The device specified by ControllerHandle is
+                                   already being managed by the driver specified
+                                   by This.
+  @retval EFI_UNSUPPORTED          The device specified by ControllerHandle is
+                                   not supported by the driver specified by This.
+
+**/
+EFI_STATUS
+EFIAPI
+SynQuacerI2cDriverBindingSupported (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE                   ControllerHandle,
+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
+  )
+{
+  NON_DISCOVERABLE_DEVICE    *Dev;
+  EFI_STATUS                 Status;
+
+  //
+  //  Connect to the non-discoverable device
+  //
+  Status = gBS->OpenProtocol (ControllerHandle,
+                              &gEdkiiNonDiscoverableDeviceProtocolGuid,
+                              (VOID **) &Dev,
+                              This->DriverBindingHandle,
+                              ControllerHandle,
+                              EFI_OPEN_PROTOCOL_BY_DRIVER);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  if (CompareGuid (Dev->Type, &gSynQuacerNonDiscoverableI2cMasterGuid) ||
+      CompareGuid (Dev->Type, &gSynQuacerNonDiscoverableRuntimeI2cMasterGuid)) {
+    Status = EFI_SUCCESS;
+  } else {
+    Status = EFI_UNSUPPORTED;
+  }
+
+  //
+  // Clean up.
+  //
+  gBS->CloseProtocol (ControllerHandle,
+                      &gEdkiiNonDiscoverableDeviceProtocolGuid,
+                      This->DriverBindingHandle,
+                      ControllerHandle);
+
+  return Status;
+}
+
+
+/**
+  Starts a device controller or a bus controller.
+
+  @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL
+                                   instance.
+  @param[in]  ControllerHandle     The handle of the device to start. This
+                                   handle must support a protocol interface that
+                                   supplies an I/O abstraction to the driver.
+  @param[in]  RemainingDevicePath  The remaining portion of the device path.
+                                   (Ignored - this is not a bus driver.)
+
+  @retval EFI_SUCCESS              The device was started.
+  @retval EFI_DEVICE_ERROR         The device could not be started due to a
+                                   device error.
+  @retval EFI_OUT_OF_RESOURCES     The request could not be completed due to a
+                                   lack of resources.
+
+**/
+EFI_STATUS
+EFIAPI
+SynQuacerI2cDriverBindingStart (
+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN EFI_HANDLE                   ControllerHandle,
+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL
+  )
+{
+  return SynQuacerI2cInit (This->DriverBindingHandle, ControllerHandle);
+}
+
+
+/**
+  Stops a device controller or a bus controller.
+
+  @param[in]  This              A pointer to the EFI_DRIVER_BINDING_PROTOCOL
+                                instance.
+  @param[in]  ControllerHandle  A handle to the device being stopped. The handle
+                                must support a bus specific I/O protocol for the
+                                driver to use to stop the device.
+  @param[in]  NumberOfChildren  The number of child device handles in
+                                ChildHandleBuffer.
+  @param[in]  ChildHandleBuffer An array of child handles to be freed. May be
+                                NULL if NumberOfChildren is 0.
+
+  @retval EFI_SUCCESS           The device was stopped.
+  @retval EFI_DEVICE_ERROR      The device could not be stopped due to a device
+                                error.
+
+**/
+EFI_STATUS
+EFIAPI
+SynQuacerI2cDriverBindingStop (
+  IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
+  IN  EFI_HANDLE                  ControllerHandle,
+  IN  UINTN                       NumberOfChildren,
+  IN  EFI_HANDLE                  *ChildHandleBuffer OPTIONAL
+  )
+{
+  return SynQuacerI2cRelease (This->DriverBindingHandle, ControllerHandle);
+}
+
+
+STATIC EFI_DRIVER_BINDING_PROTOCOL  gSynQuacerI2cDriverBinding = {
+  SynQuacerI2cDriverBindingSupported,
+  SynQuacerI2cDriverBindingStart,
+  SynQuacerI2cDriverBindingStop,
+  0xa,
+  NULL,
+  NULL
+};
+
+
+/**
+  The entry point of I2c UEFI Driver.
+
+  @param  ImageHandle                The image handle of the UEFI Driver.
+  @param  SystemTable                A pointer to the EFI System Table.
+
+  @retval  EFI_SUCCESS               The Driver or UEFI Driver exited normally.
+  @retval  EFI_INCOMPATIBLE_VERSION  _gUefiDriverRevision is greater than
+                                     SystemTable->Hdr.Revision.
+
+**/
+EFI_STATUS
+EFIAPI
+SynQuacerI2cDxeEntryPoint (
+  IN  EFI_HANDLE          ImageHandle,
+  IN  EFI_SYSTEM_TABLE    *SystemTable
+  )
+{
+  EFI_STATUS    Status;
+
+  //
+  //  Add the driver to the list of drivers
+  //
+  Status = EfiLibInstallDriverBindingComponentName2 (
+             ImageHandle, SystemTable, &gSynQuacerI2cDriverBinding, ImageHandle,
+             NULL, &gSynQuacerI2cDriverComponentName2);
+  ASSERT_EFI_ERROR (Status);
+
+  DEBUG ((DEBUG_INFO, "*** Installed SynQuacer I2C UEFI driver! ***\n"));
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Unload function for the I2c UEFI Driver.
+
+  @param  ImageHandle[in]        The allocated handle for the EFI image
+
+  @retval EFI_SUCCESS            The driver was unloaded successfully
+  @retval EFI_INVALID_PARAMETER  ImageHandle is not a valid image handle.
+
+**/
+EFI_STATUS
+EFIAPI
+SynQuacerI2cDxeUnload (
+  IN EFI_HANDLE  ImageHandle
+  )
+{
+  EFI_STATUS  Status;
+  EFI_HANDLE  *HandleBuffer;
+  UINTN       HandleCount;
+  UINTN       Index;
+
+  //
+  // Retrieve all USB I/O handles in the handle database
+  //
+  Status = gBS->LocateHandleBuffer (ByProtocol,
+                                    &gEdkiiNonDiscoverableDeviceProtocolGuid,
+                                    NULL,
+                                    &HandleCount,
+                                    &HandleBuffer);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Disconnect the driver from the handles in the handle database
+  //
+  for (Index = 0; Index < HandleCount; Index++) {
+    Status = gBS->DisconnectController (HandleBuffer[Index],
+                                        gImageHandle,
+                                        NULL);
+  }
+
+  //
+  // Free the handle array
+  //
+  gBS->FreePool (HandleBuffer);
+
+  //
+  // Uninstall protocols installed by the driver in its entrypoint
+  //
+  Status = gBS->UninstallMultipleProtocolInterfaces (ImageHandle,
+                  &gEfiDriverBindingProtocolGuid,
+                  &gSynQuacerI2cDriverBinding,
+                  NULL
+                  );
+
+  return EFI_SUCCESS;
+}
diff --git a/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.c b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.c
new file mode 100644
index 000000000000..fb404b17f93c
--- /dev/null
+++ b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.c
@@ -0,0 +1,588 @@
+/** @file
+
+  Copyright (c) 2017, 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.
+
+**/
+
+#include "SynQuacerI2cDxe.h"
+
+#define BOOTTIME_DEBUG(x)       do { if (!EfiAtRuntime()) DEBUG (x); } while (0)
+
+//
+// We cannot use Stall () or timer events at runtime, so we need to busy-wait
+// for the controller to signal the completion interrupts. This value was
+// arbitrarily chosen, and does not appear to produce any premature timeouts
+// nor does it result in noticeable stalls in case of bus errors.
+//
+#define WAIT_FOR_INTERRUPT_TIMEOUT    50000
+
+/**
+  Set the frequency for the I2C clock line.
+
+  This routine must be called at or below TPL_NOTIFY.
+
+  The software and controller do a best case effort of using the specified
+  frequency for the I2C bus.  If the frequency does not match exactly then
+  the I2C master protocol selects the next lower frequency to avoid
+  exceeding the operating conditions for any of the I2C devices on the bus.
+  For example if 400 KHz was specified and the controller's divide network
+  only supports 402 KHz or 398 KHz then the I2C master protocol selects 398
+  KHz.  If there are not lower frequencies available, then return
+  EFI_UNSUPPORTED.
+
+  @param[in] This           Pointer to an EFI_I2C_MASTER_PROTOCOL structure
+  @param[in] BusClockHertz  Pointer to the requested I2C bus clock frequency
+                            in Hertz.  Upon return this value contains the
+                            actual frequency in use by the I2C controller.
+
+  @retval EFI_SUCCESS           The bus frequency was set successfully.
+  @retval EFI_ALREADY_STARTED   The controller is busy with another transaction.
+  @retval EFI_INVALID_PARAMETER BusClockHertz is NULL
+  @retval EFI_UNSUPPORTED       The controller does not support this frequency.
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SynQuacerI2cSetBusFrequency (
+  IN CONST EFI_I2C_MASTER_PROTOCOL   *This,
+  IN OUT UINTN                       *BusClockHertz
+  )
+{
+  SYNQUACER_I2C_MASTER        *I2c;
+  UINT8                       Ccr, Csr;
+
+  I2c = SYNQUACER_I2C_FROM_THIS (This);
+
+  if (BusClockHertz == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (*BusClockHertz >= F_I2C_SPEED_FM) {
+    if (REFCLK_RATE <= F_I2C_CLK_RATE_18M) {
+      Ccr = F_I2C_CCR_CS_FAST_MAX_18M (REFCLK_RATE);
+      Csr = F_I2C_CSR_CS_FAST_MAX_18M (REFCLK_RATE);
+    } else {
+      Ccr = F_I2C_CCR_CS_FAST_MIN_18M (REFCLK_RATE);
+      Csr = F_I2C_CSR_CS_FAST_MIN_18M (REFCLK_RATE);
+    }
+
+    // Set Clock and enable, Set fast mode
+    MmioWrite8 (I2c->MmioBase + F_I2C_REG_CCR,
+      Ccr | F_I2C_CCR_FM | F_I2C_CCR_EN);
+    MmioWrite8 (I2c->MmioBase + F_I2C_REG_CSR, Csr);
+
+    *BusClockHertz = F_I2C_SPEED_FM;
+
+  } else if (*BusClockHertz >= F_I2C_SPEED_SM) {
+    if (REFCLK_RATE <= F_I2C_CLK_RATE_18M) {
+      Ccr = F_I2C_CCR_CS_STANDARD_MAX_18M (REFCLK_RATE);
+      Csr = F_I2C_CSR_CS_STANDARD_MAX_18M (REFCLK_RATE);
+    } else {
+      Ccr = F_I2C_CCR_CS_STANDARD_MIN_18M (REFCLK_RATE);
+      Csr = F_I2C_CSR_CS_STANDARD_MIN_18M (REFCLK_RATE);
+    }
+
+    // Set Clock and enable, Set standard mode
+    MmioWrite8 (I2c->MmioBase + F_I2C_REG_CCR, Ccr | F_I2C_CCR_EN);
+    MmioWrite8 (I2c->MmioBase + F_I2C_REG_CSR, Csr);
+
+    *BusClockHertz = F_I2C_SPEED_SM;
+  } else {
+    return EFI_UNSUPPORTED;
+  }
+
+  MemoryFence ();
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Reset the I2C controller and configure it for use
+
+  This routine must be called at or below TPL_NOTIFY.
+
+  The I2C controller is reset.  The caller must call SetBusFrequench() after
+  calling Reset().
+
+  @param[in]     This       Pointer to an EFI_I2C_MASTER_PROTOCOL structure.
+
+  @retval EFI_SUCCESS         The reset completed successfully.
+  @retval EFI_ALREADY_STARTED The controller is busy with another transaction.
+  @retval EFI_DEVICE_ERROR    The reset operation failed.
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SynQuacerI2cReset (
+  IN CONST EFI_I2C_MASTER_PROTOCOL *This
+  )
+{
+  SYNQUACER_I2C_MASTER        *I2c;
+
+  I2c = SYNQUACER_I2C_FROM_THIS (This);
+
+  // Disable the clock
+  MmioWrite8 (I2c->MmioBase + F_I2C_REG_CCR, 0);
+  MmioWrite8 (I2c->MmioBase + F_I2C_REG_CSR, 0);
+
+  MemoryFence ();
+
+  // Set own Address
+  MmioWrite8 (I2c->MmioBase + F_I2C_REG_ADR, 0);
+
+  // Set PCLK frequency
+  MmioWrite8 (I2c->MmioBase + F_I2C_REG_FSR, F_I2C_BUS_CLK_FR (REFCLK_RATE));
+
+  // clear IRQ (INT=0, BER=0), Interrupt Disable
+  MmioWrite8 (I2c->MmioBase + F_I2C_REG_BCR, 0);
+  MmioWrite8 (I2c->MmioBase + F_I2C_REG_BC2R, 0);
+
+  MemoryFence ();
+
+  return EFI_SUCCESS;
+}
+
+STATIC
+EFI_STATUS
+SynQuacerI2cMasterStart (
+  IN  SYNQUACER_I2C_MASTER        *I2c,
+  IN  UINTN                       SlaveAddress,
+  IN  EFI_I2C_OPERATION           *Op
+  )
+{
+  UINT8                       Bsr;
+  UINT8                       Bcr;
+
+  if (Op->Flags & I2C_FLAG_READ) {
+    MmioWrite8 (I2c->MmioBase + F_I2C_REG_DAR, (SlaveAddress << 1) | 1);
+  } else {
+    MmioWrite8 (I2c->MmioBase + F_I2C_REG_DAR, SlaveAddress << 1);
+  }
+
+  BOOTTIME_DEBUG ((DEBUG_INFO, "%a: slave:0x%02x\n", __FUNCTION__,
+    SlaveAddress));
+
+  Bsr = MmioRead8 (I2c->MmioBase + F_I2C_REG_BSR);
+  Bcr = MmioRead8 (I2c->MmioBase + F_I2C_REG_BCR);
+
+  if ((Bsr & F_I2C_BSR_BB) && !(Bcr & F_I2C_BCR_MSS)) {
+    BOOTTIME_DEBUG ((DEBUG_INFO, "%a: bus is busy\n", __FUNCTION__));
+    return EFI_ALREADY_STARTED;
+  }
+
+  if (Bsr & F_I2C_BSR_BB) { // Bus is busy
+    BOOTTIME_DEBUG ((DEBUG_INFO, "%a: Continuous Start\n", __FUNCTION__));
+    MmioWrite8 (I2c->MmioBase + F_I2C_REG_BCR, Bcr | F_I2C_BCR_SCC);
+  } else {
+    if (Bcr & F_I2C_BCR_MSS) {
+      BOOTTIME_DEBUG ((DEBUG_WARN,
+        "%a: is not in master mode\n", __FUNCTION__));
+      return EFI_DEVICE_ERROR;
+    }
+    BOOTTIME_DEBUG ((DEBUG_INFO, "%a: Start Condition\n", __FUNCTION__));
+    MmioWrite8 (I2c->MmioBase + F_I2C_REG_BCR,
+                Bcr | F_I2C_BCR_MSS | F_I2C_BCR_INTE | F_I2C_BCR_BEIE);
+  }
+  return EFI_SUCCESS;
+}
+
+STATIC
+EFI_STATUS
+WaitForInterrupt (
+  IN  SYNQUACER_I2C_MASTER        *I2c
+  )
+{
+  UINT8       Bsr;
+  UINTN       Timeout = WAIT_FOR_INTERRUPT_TIMEOUT;
+
+  do {
+    MemoryFence ();
+
+    Bsr = MmioRead8 (I2c->MmioBase + F_I2C_REG_BCR);
+    if (Bsr & F_I2C_BCR_INT) {
+      return EFI_SUCCESS;
+    }
+  } while (Timeout--);
+
+  return EFI_DEVICE_ERROR;
+}
+
+/**
+  Start an I2C transaction on the host controller.
+
+  This routine must be called at or below TPL_NOTIFY.  For synchronous
+  requests this routine must be called at or below TPL_CALLBACK.
+
+  This function initiates an I2C transaction on the controller.  To
+  enable proper error handling by the I2C protocol stack, the I2C
+  master protocol does not support queuing but instead only manages
+  one I2C transaction at a time.  This API requires that the I2C bus
+  is in the correct configuration for the I2C transaction.
+
+  The transaction is performed by sending a start-bit and selecting the
+  I2C device with the specified I2C slave address and then performing
+  the specified I2C operations.  When multiple operations are requested
+  they are separated with a repeated start bit and the slave address.
+  The transaction is terminated with a stop bit.
+
+  When Event is NULL, StartRequest operates synchronously and returns
+  the I2C completion status as its return value.
+
+  When Event is not NULL, StartRequest synchronously returns EFI_SUCCESS
+  indicating that the I2C transaction was started asynchronously.  The
+  transaction status value is returned in the buffer pointed to by
+  I2cStatus upon the completion of the I2C transaction when I2cStatus
+  is not NULL.  After the transaction status is returned the Event is
+  signaled.
+
+  Note: The typical consumer of this API is the I2C host protocol.
+  Extreme care must be taken by other consumers of this API to prevent
+  confusing the third party I2C drivers due to a state change at the
+  I2C device which the third party I2C drivers did not initiate.  I2C
+  platform specific code may use this API within these guidelines.
+
+  @param[in] This           Pointer to an EFI_I2C_MASTER_PROTOCOL structure.
+  @param[in] SlaveAddress   Address of the device on the I2C bus.  Set the
+                            I2C_ADDRESSING_10_BIT when using 10-bit addresses,
+                            clear this bit for 7-bit addressing.  Bits 0-6
+                            are used for 7-bit I2C slave addresses and bits
+                            0-9 are used for 10-bit I2C slave addresses.
+  @param[in] RequestPacket  Pointer to an EFI_I2C_REQUEST_PACKET
+                            structure describing the I2C transaction.
+  @param[in] Event          Event to signal for asynchronous transactions,
+                            NULL for synchronous transactions
+  @param[out] I2cStatus     Optional buffer to receive the I2C transaction
+                            completion status
+
+  @retval EFI_SUCCESS           The asynchronous transaction was successfully
+                                started when Event is not NULL.
+  @retval EFI_SUCCESS           The transaction completed successfully when
+                                Event is NULL.
+  @retval EFI_ALREADY_STARTED   The controller is busy with another transaction.
+  @retval EFI_BAD_BUFFER_SIZE   The RequestPacket->LengthInBytes value is too
+                                large.
+  @retval EFI_DEVICE_ERROR      There was an I2C error (NACK) during the
+                                transaction.
+  @retval EFI_INVALID_PARAMETER RequestPacket is NULL
+  @retval EFI_NOT_FOUND         Reserved bit set in the SlaveAddress parameter
+  @retval EFI_NO_RESPONSE       The I2C device is not responding to the slave
+                                address.  EFI_DEVICE_ERROR will be returned if
+                                the controller cannot distinguish when the NACK
+                                occurred.
+  @retval EFI_OUT_OF_RESOURCES  Insufficient memory for I2C transaction
+  @retval EFI_UNSUPPORTED       The controller does not support the requested
+                                transaction.
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+SynQuacerI2cStartRequest (
+  IN  CONST EFI_I2C_MASTER_PROTOCOL   *This,
+  IN  UINTN                           SlaveAddress,
+  IN  EFI_I2C_REQUEST_PACKET          *RequestPacket,
+  IN  EFI_EVENT                       Event      OPTIONAL,
+  OUT EFI_STATUS                      *I2cStatus OPTIONAL
+  )
+{
+  SYNQUACER_I2C_MASTER        *I2c;
+  UINTN                       Idx;
+  EFI_I2C_OPERATION           *Op;
+  UINTN                       BufIdx;
+  EFI_STATUS                  Status;
+  EFI_TPL                     Tpl;
+  BOOLEAN                     AtRuntime;
+  UINT8                       Bsr;
+  UINT8                       Bcr;
+
+  I2c = SYNQUACER_I2C_FROM_THIS (This);
+
+  //
+  // We can only do synchronous operations at runtime
+  //
+  AtRuntime = EfiAtRuntime ();
+  if (AtRuntime && Event != NULL) {
+    return EFI_UNSUPPORTED;
+  }
+
+  if (!AtRuntime) {
+    Tpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
+  }
+
+  for (Idx = 0, Op = RequestPacket->Operation, Status = EFI_SUCCESS;
+       Idx < RequestPacket->OperationCount && !EFI_ERROR (Status);
+       Idx++, Op++) {
+
+    Status = SynQuacerI2cMasterStart (I2c, SlaveAddress, Op);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+
+    Status = WaitForInterrupt (I2c);
+    if (EFI_ERROR (Status)) {
+        BOOTTIME_DEBUG ((DEBUG_WARN, "%a: Timeout waiting for interrupt - %r\n",
+        Status));
+      break;
+    }
+
+    if (MmioRead8 (I2c->MmioBase + F_I2C_REG_BSR) & F_I2C_BSR_LRB) {
+      BOOTTIME_DEBUG ((DEBUG_WARN, "%a: No ack received - %r\n", __FUNCTION__));
+      Status = EFI_DEVICE_ERROR;
+      break;
+    }
+
+    BufIdx = 0;
+    do {
+      Bsr = MmioRead8 (I2c->MmioBase + F_I2C_REG_BSR);
+      Bcr = MmioRead8 (I2c->MmioBase + F_I2C_REG_BCR);
+
+      if (Bcr & F_I2C_BCR_BER) {
+        BOOTTIME_DEBUG ((DEBUG_WARN, "%a: Bus error detected\n", __FUNCTION__));
+        Status = EFI_DEVICE_ERROR;
+        break;
+      }
+
+      if ((Bsr & F_I2C_BSR_AL) || !(Bcr & F_I2C_BCR_MSS)) {
+        BOOTTIME_DEBUG ((DEBUG_WARN, "%a: Arbitration lost\n", __FUNCTION__));
+        Status = EFI_DEVICE_ERROR;
+        break;
+      }
+
+      if (Op->Flags & I2C_FLAG_READ) {
+        if (BufIdx == Op->LengthInBytes - 1) {
+          MmioWrite8 (I2c->MmioBase + F_I2C_REG_BCR,
+            F_I2C_BCR_MSS | F_I2C_BCR_INTE | F_I2C_BCR_BEIE);
+        } else {
+          MmioWrite8 (I2c->MmioBase + F_I2C_REG_BCR,
+            F_I2C_BCR_MSS | F_I2C_BCR_INTE | F_I2C_BCR_BEIE | F_I2C_BCR_ACK);
+        }
+
+        Status = WaitForInterrupt (I2c);
+        if (EFI_ERROR (Status)) {
+          BOOTTIME_DEBUG ((DEBUG_WARN,
+            "%a: Timeout waiting for interrupt - %r\n", __FUNCTION__, Status));
+          break;
+        }
+
+        if (!(MmioRead8 (I2c->MmioBase + F_I2C_REG_BSR) & F_I2C_BSR_FBT)) {
+          Op->Buffer [BufIdx++] = MmioRead8 (I2c->MmioBase + F_I2C_REG_DAR);
+        }
+      } else {
+        MmioWrite8 (I2c->MmioBase + F_I2C_REG_DAR, Op->Buffer [BufIdx++]);
+        MmioWrite8 (I2c->MmioBase + F_I2C_REG_BCR,
+          F_I2C_BCR_MSS | F_I2C_BCR_INTE | F_I2C_BCR_BEIE);
+
+        Status = WaitForInterrupt (I2c);
+        if (EFI_ERROR (Status)) {
+          BOOTTIME_DEBUG ((DEBUG_WARN,
+            "%a: Timeout waiting for interrupt - %r\n", __FUNCTION__, Status));
+          break;
+        }
+
+        if (MmioRead8 (I2c->MmioBase + F_I2C_REG_BSR) & F_I2C_BSR_LRB) {
+          BOOTTIME_DEBUG ((DEBUG_WARN, "%a: No ack received\n", __FUNCTION__));
+          Status = EFI_DEVICE_ERROR;
+          break;
+        }
+      }
+    } while (BufIdx < Op->LengthInBytes);
+  }
+
+  // Stop the transfer
+  MmioWrite8 (I2c->MmioBase + F_I2C_REG_BCR, 0);
+
+  if (!AtRuntime) {
+    gBS->RestoreTPL (Tpl);
+  }
+
+  if (Event) {
+    *I2cStatus = Status;
+    gBS->SignalEvent (Event);
+  }
+  return Status;
+}
+
+STATIC CONST EFI_I2C_CONTROLLER_CAPABILITIES mI2cControllerCapabilities = {
+  sizeof (EFI_I2C_CONTROLLER_CAPABILITIES),   // StructureSizeInBytes
+  MAX_UINT32,                                 // MaximumReceiveBytes
+  MAX_UINT32,                                 // MaximumTransmitBytes
+  MAX_UINT32,                                 // MaximumTotalBytes
+};
+
+STATIC
+VOID
+EFIAPI
+SynQuacerI2cVirtualNotifyEvent (
+  IN EFI_EVENT        Event,
+  IN VOID             *Context
+  )
+{
+  SYNQUACER_I2C_MASTER    *I2c = Context;
+
+  EfiConvertPointer (0x0, (VOID **)&I2c->I2cMaster.SetBusFrequency);
+  EfiConvertPointer (0x0, (VOID **)&I2c->I2cMaster.Reset);
+  EfiConvertPointer (0x0, (VOID **)&I2c->I2cMaster.StartRequest);
+  EfiConvertPointer (0x0, (VOID **)&I2c->I2cMaster.I2cControllerCapabilities);
+  EfiConvertPointer (0x0, (VOID **)&I2c->MmioBase);
+}
+
+EFI_STATUS
+SynQuacerI2cInit (
+  IN      EFI_HANDLE        DriverBindingHandle,
+  IN      EFI_HANDLE        ControllerHandle
+  )
+{
+  EFI_STATUS                        Status;
+  NON_DISCOVERABLE_DEVICE           *Dev;
+  SYNQUACER_I2C_MASTER              *I2c;
+  BOOLEAN                           Runtime;
+
+  Status = gBS->OpenProtocol (ControllerHandle,
+                              &gEdkiiNonDiscoverableDeviceProtocolGuid,
+                              (VOID **)&Dev, DriverBindingHandle,
+                              ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Runtime = CompareGuid (Dev->Type,
+                         &gSynQuacerNonDiscoverableRuntimeI2cMasterGuid);
+
+  // Allocate Resources
+  if (Runtime) {
+    I2c = AllocateRuntimeZeroPool (sizeof (SYNQUACER_I2C_MASTER));
+  } else {
+    I2c = AllocateZeroPool (sizeof (SYNQUACER_I2C_MASTER));
+  }
+  if (I2c == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto CloseProtocol;
+  }
+
+  I2c->Signature                            = SYNQUACER_I2C_SIGNATURE;
+  I2c->I2cMaster.SetBusFrequency            = SynQuacerI2cSetBusFrequency;
+  I2c->I2cMaster.Reset                      = SynQuacerI2cReset;
+  I2c->I2cMaster.StartRequest               = SynQuacerI2cStartRequest;
+  I2c->I2cMaster.I2cControllerCapabilities  = &mI2cControllerCapabilities;
+  I2c->MmioBase                             = Dev->Resources[0].AddrRangeMin;
+  I2c->Dev                                  = Dev;
+
+  if (Runtime) {
+    I2c->Runtime = TRUE;
+
+    // Declare the controller as EFI_MEMORY_RUNTIME
+    Status = gDS->AddMemorySpace (
+                    EfiGcdMemoryTypeMemoryMappedIo,
+                    Dev->Resources[0].AddrRangeMin,
+                    Dev->Resources[0].AddrLen,
+                    EFI_MEMORY_UC | EFI_MEMORY_RUNTIME);
+    if (EFI_ERROR (Status)) {
+      BOOTTIME_DEBUG ((DEBUG_WARN, "%a: failed to add memory space - %r\n",
+        __FUNCTION__, Status));
+    }
+
+    Status = gDS->SetMemorySpaceAttributes (
+                    Dev->Resources[0].AddrRangeMin,
+                    Dev->Resources[0].AddrLen,
+                    EFI_MEMORY_UC | EFI_MEMORY_RUNTIME);
+    if (EFI_ERROR (Status)) {
+      goto FreeDevice;
+    }
+
+    //
+    // Register for the virtual address change event
+    //
+    Status = gBS->CreateEventEx (EVT_NOTIFY_SIGNAL, TPL_NOTIFY,
+                    SynQuacerI2cVirtualNotifyEvent, I2c,
+                    &gEfiEventVirtualAddressChangeGuid,
+                    &I2c->VirtualAddressChangeEvent);
+    if (EFI_ERROR (Status)) {
+      goto FreeDevice;
+    }
+  }
+
+  CopyGuid (&I2c->DevicePath.Vendor.Guid, &gEfiCallerIdGuid);
+  I2c->DevicePath.MmioBase = I2c->MmioBase;
+  SetDevicePathNodeLength (&I2c->DevicePath.Vendor,
+    sizeof (I2c->DevicePath) - sizeof (I2c->DevicePath.End));
+  SetDevicePathEndNode (&I2c->DevicePath.End);
+
+  Status = gBS->InstallMultipleProtocolInterfaces (&ControllerHandle,
+                  &gEfiI2cMasterProtocolGuid, &I2c->I2cMaster,
+                  &gEfiDevicePathProtocolGuid, &I2c->DevicePath,
+                  NULL);
+  if (EFI_ERROR (Status)) {
+    goto CloseEvent;
+  }
+  return EFI_SUCCESS;
+
+CloseEvent:
+  if (Runtime) {
+    gBS->CloseEvent (I2c->VirtualAddressChangeEvent);
+  }
+
+FreeDevice:
+  FreePool (I2c);
+
+CloseProtocol:
+  gBS->CloseProtocol (ControllerHandle,
+                      &gEdkiiNonDiscoverableDeviceProtocolGuid,
+                      DriverBindingHandle,
+                      ControllerHandle);
+  return Status;
+}
+
+EFI_STATUS
+SynQuacerI2cRelease (
+  IN      EFI_HANDLE        DriverBindingHandle,
+  IN      EFI_HANDLE        ControllerHandle
+  )
+{
+  EFI_I2C_MASTER_PROTOCOL       *I2cMaster;
+  SYNQUACER_I2C_MASTER          *I2c;
+  EFI_STATUS                    Status;
+
+  Status = gBS->HandleProtocol (ControllerHandle,
+                                &gEfiI2cMasterProtocolGuid,
+                                (VOID **)&I2cMaster);
+  ASSERT_EFI_ERROR (Status);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  I2c = SYNQUACER_I2C_FROM_THIS (I2cMaster);
+
+  Status = gBS->UninstallMultipleProtocolInterfaces (ControllerHandle,
+                  &gEfiI2cMasterProtocolGuid, I2cMaster,
+                  &gEfiDevicePathProtocolGuid, &I2c->DevicePath,
+                  NULL);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  if (I2c->Runtime) {
+    gBS->CloseEvent (I2c->VirtualAddressChangeEvent);
+  }
+
+  Status = gBS->CloseProtocol (ControllerHandle,
+                               &gEdkiiNonDiscoverableDeviceProtocolGuid,
+                               DriverBindingHandle,
+                               ControllerHandle);
+  ASSERT_EFI_ERROR (Status);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  gBS->FreePool (I2c);
+
+  return EFI_SUCCESS;
+}
diff --git a/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.h b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.h
new file mode 100644
index 000000000000..695a885f664e
--- /dev/null
+++ b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.h
@@ -0,0 +1,162 @@
+/** @file
+
+  Copyright (c) 2017, 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.
+
+**/
+
+#ifndef __SYNQUACER_I2C_DXE_H__
+#define __SYNQUACER_I2C_DXE_H__
+
+#include <PiDxe.h>
+
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/IoLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+#include <Library/UefiRuntimeLib.h>
+
+#include <Protocol/I2cMaster.h>
+#include <Protocol/NonDiscoverableDevice.h>
+
+extern EFI_COMPONENT_NAME2_PROTOCOL gSynQuacerI2cDriverComponentName2;
+
+#define SYNQUACER_I2C_SIGNATURE         SIGNATURE_32 ('S', 'I', '2', 'C')
+#define SYNQUACER_I2C_FROM_THIS(a)      CR ((a), SYNQUACER_I2C_MASTER, \
+                                            I2cMaster, SYNQUACER_I2C_SIGNATURE)
+
+#pragma pack(1)
+typedef struct {
+  VENDOR_DEVICE_PATH              Vendor;
+  UINT64                          MmioBase;
+  EFI_DEVICE_PATH_PROTOCOL        End;
+} SYNQUACER_I2C_DEVICE_PATH;
+#pragma pack()
+
+typedef struct {
+  UINT32                          Signature;
+  EFI_I2C_MASTER_PROTOCOL         I2cMaster;
+  EFI_PHYSICAL_ADDRESS            MmioBase;
+  SYNQUACER_I2C_DEVICE_PATH       DevicePath;
+  NON_DISCOVERABLE_DEVICE         *Dev;
+  EFI_EVENT                       VirtualAddressChangeEvent;
+  BOOLEAN                         Runtime;
+} SYNQUACER_I2C_MASTER;
+
+EFI_STATUS
+SynQuacerI2cInit (
+  IN      EFI_HANDLE              DriverBindingHandle,
+  IN      EFI_HANDLE              ControllerHandle
+  );
+
+EFI_STATUS
+SynQuacerI2cRelease (
+  IN      EFI_HANDLE              DriverBindingHandle,
+  IN      EFI_HANDLE              ControllerHandle
+  );
+
+#define REFCLK_RATE         FixedPcdGet32 (PcdI2cReferenceClock)
+
+#define DIV_ROUND_UP(n, d)  (((n) + (d) - 1) / (d))
+
+#define F_I2C_SPEED_SM      100000
+#define F_I2C_SPEED_FM      400000
+
+// I2C register adress definitions
+#define F_I2C_REG_BSR       (0x00 << 2) // Bus Status Regster
+#define F_I2C_REG_BCR       (0x01 << 2) // Bus Control Register
+#define F_I2C_REG_CCR       (0x02 << 2) // Clock Control Register
+#define F_I2C_REG_ADR       (0x03 << 2) // Address Register
+#define F_I2C_REG_DAR       (0x04 << 2) // Data Register
+#define F_I2C_REG_CSR       (0x05 << 2) // Expansion CS Register
+#define F_I2C_REG_FSR       (0x06 << 2) // Bus Clock Frequency Register
+#define F_I2C_REG_BC2R      (0x07 << 2) // Bus Control 2 Register
+
+// I2C register bit definitions
+#define F_I2C_BSR_FBT       BIT0        // First Byte Transfer
+#define F_I2C_BSR_GCA       BIT1        // General Call Address
+#define F_I2C_BSR_AAS       BIT2        // Address as Slave
+#define F_I2C_BSR_TRX       BIT3        // Transfer/Receive
+#define F_I2C_BSR_LRB       BIT4        // Last Received Bit
+#define F_I2C_BSR_AL        BIT5        // Arbitration Lost
+#define F_I2C_BSR_RSC       BIT6        // Repeated Start Condition
+#define F_I2C_BSR_BB        BIT7        // Bus Busy
+
+#define F_I2C_BCR_INT       BIT0        // Interrupt
+#define F_I2C_BCR_INTE      BIT1        // Interrupt Enable
+#define F_I2C_BCR_GCAA      BIT2        // General Call Access Acknowledge
+#define F_I2C_BCR_ACK       BIT3        // Acknowledge
+#define F_I2C_BCR_MSS       BIT4        // Master Slave Select
+#define F_I2C_BCR_SCC       BIT5        // Start Condition Continue
+#define F_I2C_BCR_BEIE      BIT6        // Bus Error Interrupt Enable
+#define F_I2C_BCR_BER       BIT7        // Bus Error
+
+#define F_I2C_CCR_CS_MASK   0x1f        // CCR Clock Period Select
+#define F_I2C_CCR_EN        BIT5        // Enable
+#define F_I2C_CCR_FM        BIT6        // Speed Mode Select
+
+#define F_I2C_CSR_CS_MASK   0x3f        // CSR Clock Period Select
+
+#define F_I2C_BC2R_SCLL     BIT0        // SCL Low Drive
+#define F_I2C_BC2R_SDAL     BIT1        // SDA Low Drive
+#define F_I2C_BC2R_SCLS     BIT4        // SCL Status
+#define F_I2C_BC2R_SDAS     BIT5        // SDA Status
+
+// PCLK frequency
+#define F_I2C_BUS_CLK_FR(rate)          ((rate) / 20000000 + 1)
+
+#define F_I2C_MIN_CLK_RATE              (14 * 1000000)  // min frequency 14 MHz
+#define F_I2C_MAX_CLK_RATE              (200 * 1000000) // max frequency 200 MHz
+#define F_I2C_CLK_RATE_18M              (18 * 1000000)  // threshold freq 18 MHz
+
+// STANDARD MODE frequency
+#define F_I2C_CLK_MASTER_STANDARD(rate) \
+            DIV_ROUND_UP (DIV_ROUND_UP ((rate), 100000) - 2, 2)
+
+// FAST MODE frequency
+#define F_I2C_CLK_MASTER_FAST(rate) \
+            DIV_ROUND_UP ((DIV_ROUND_UP ((rate), 400000) - 2) * 2, 3)
+
+// (clkrate <= 18000000)
+// calculate the value of CS bits in CCR register in standard mode
+#define F_I2C_CCR_CS_STANDARD_MAX_18M(rate) \
+            ((F_I2C_CLK_MASTER_STANDARD (rate) - 65) & F_I2C_CCR_CS_MASK)
+
+// calculate the value of CS bits in CSR register in standard mode
+#define F_I2C_CSR_CS_STANDARD_MAX_18M(rate) 0x00
+
+// calculate the value of CS bits in CCR register in fast mode
+#define F_I2C_CCR_CS_FAST_MAX_18M(rate) \
+            ((F_I2C_CLK_MASTER_FAST (rate) - 1)  & F_I2C_CCR_CS_MASK)
+
+// calculate the value of CS bits in CSR register in fast mode
+#define F_I2C_CSR_CS_FAST_MAX_18M(rate) 0x00
+
+// (clkrate > 18000000)
+// calculate the value of CS bits in CCR register in standard mode */
+#define F_I2C_CCR_CS_STANDARD_MIN_18M(rate) \
+            ((F_I2C_CLK_MASTER_STANDARD (rate) - 1) & F_I2C_CCR_CS_MASK)
+
+// calculate the value of CS bits in CSR register in standard mode
+#define F_I2C_CSR_CS_STANDARD_MIN_18M(rate) \
+            (((F_I2C_CLK_MASTER_STANDARD (rate) - 1) >> 5) & F_I2C_CSR_CS_MASK)
+
+// calculate the value of CS bits in CCR register in fast mode
+#define F_I2C_CCR_CS_FAST_MIN_18M(rate) \
+            ((F_I2C_CLK_MASTER_FAST (rate) - 1) & F_I2C_CCR_CS_MASK)
+
+/* calculate the value of CS bits in CSR register in fast mode */
+#define F_I2C_CSR_CS_FAST_MIN_18M(rate) \
+            (((F_I2C_CLK_MASTER_FAST (rate) - 1) >> 5) & F_I2C_CSR_CS_MASK)
+
+#endif
diff --git a/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.inf b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.inf
new file mode 100644
index 000000000000..fa715366878c
--- /dev/null
+++ b/Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.inf
@@ -0,0 +1,59 @@
+#/** @file
+#
+#  Copyright (c) 2017, 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                      = SynQuacerI2cDxe
+  FILE_GUID                      = ab5ed376-dd38-4d22-ae89-b645a4a3236e
+  MODULE_TYPE                    = DXE_RUNTIME_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = SynQuacerI2cDxeEntryPoint
+  UNLOAD                         = SynQuacerI2cDxeUnload
+
+[Sources.common]
+  ComponentName.c
+  DriverBinding.c
+  SynQuacerI2cDxe.c
+  SynQuacerI2cDxe.h
+
+[Packages]
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+  Silicon/Socionext/SynQuacer/SynQuacer.dec
+
+[LibraryClasses]
+  BaseMemoryLib
+  DebugLib
+  DevicePathLib
+  DxeServicesTableLib
+  IoLib
+  MemoryAllocationLib
+  UefiBootServicesTableLib
+  UefiLib
+  UefiDriverEntryPoint
+  UefiRuntimeLib
+
+[Guids]
+  gEfiEventVirtualAddressChangeGuid
+  gSynQuacerNonDiscoverableI2cMasterGuid
+  gSynQuacerNonDiscoverableRuntimeI2cMasterGuid
+
+[Protocols]
+  gEdkiiNonDiscoverableDeviceProtocolGuid     ## TO_START
+  gEfiI2cMasterProtocolGuid                   ## BY_START
+
+[FixedPcd]
+  gSynQuacerTokenSpaceGuid.PcdI2cReferenceClock
+
+[Depex]
+  TRUE
diff --git a/Silicon/Socionext/SynQuacer/SynQuacer.dec b/Silicon/Socionext/SynQuacer/SynQuacer.dec
index cb3f836f5922..05ec15749e2e 100644
--- a/Silicon/Socionext/SynQuacer/SynQuacer.dec
+++ b/Silicon/Socionext/SynQuacer/SynQuacer.dec
@@ -22,6 +22,9 @@ [Includes]
 [Guids]
   gSynQuacerTokenSpaceGuid = { 0x4d04555b, 0xdfdc, 0x418a, { 0x8a, 0xab, 0x07, 0xce, 0xef, 0x46, 0x82, 0xbb } }
 
+  gSynQuacerNonDiscoverableI2cMasterGuid = { 0x364ee675, 0x9e44, 0x42b7, { 0xa5, 0xe4, 0x92, 0x84, 0xdb, 0x85, 0xda, 0x09 } }
+  gSynQuacerNonDiscoverableRuntimeI2cMasterGuid = { 0x5f35aa9b, 0x8c6f, 0x4828, { 0xbd, 0x44, 0x7c, 0xc0, 0xeb, 0x2d, 0xfe, 0xb9 } }
+
 [Ppis]
   gSynQuacerDramInfoPpiGuid = { 0x3e1d7356, 0xdda4, 0x4b1a, { 0x93, 0x46, 0xbf, 0x89, 0x1c, 0x86, 0x46, 0xcc } }
 
@@ -33,3 +36,5 @@ [PcdsFixedAtBuild]
 
   # GPIO pin index [0 .. 31] or 0xFF for not implemented
   gSynQuacerTokenSpaceGuid.PcdClearSettingsGpioPin|0xFF|UINT8|0x00000004
+
+  gSynQuacerTokenSpaceGuid.PcdI2cReferenceClock|62500000|UINT32|0x00000005
-- 
2.11.0