EmbeddedPkg: import DesignWare EMMC driver

Imported from OpenPlatformPkg 0434ff62e3eb896e6c561dea84cfb8b80391603e. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2017-05-03 17:05:47 +01:00
parent d547b32dcc
commit ee66053106
4 changed files with 832 additions and 0 deletions
--- a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
+++ b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
@@ -0,0 +1,648 @@
+/** @file
+  This file implement the MMC Host Protocol for the DesignWare eMMC.
+
+  Copyright (c) 2014-2017, 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.
+
+**/
+
+#include <Library/BaseMemoryLib.h>
+#include <Library/CacheMaintenanceLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/IoLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PcdLib.h>
+#include <Library/TimerLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+
+#include <Protocol/MmcHost.h>
+
+#include "DwEmmc.h"
+
+#define DWEMMC_DESC_PAGE                1
+#define DWEMMC_BLOCK_SIZE               512
+#define DWEMMC_DMA_BUF_SIZE             (512 * 8)
+#define DWEMMC_MAX_DESC_PAGES           512
+
+typedef struct {
+  UINT32                        Des0;
+  UINT32                        Des1;
+  UINT32                        Des2;
+  UINT32                        Des3;
+} DWEMMC_IDMAC_DESCRIPTOR;
+
+EFI_MMC_HOST_PROTOCOL     *gpMmcHost;
+DWEMMC_IDMAC_DESCRIPTOR   *gpIdmacDesc;
+EFI_GUID mDwEmmcDevicePathGuid = EFI_CALLER_ID_GUID;
+STATIC UINT32 mDwEmmcCommand;
+STATIC UINT32 mDwEmmcArgument;
+
+EFI_STATUS
+DwEmmcReadBlockData (
+  IN EFI_MMC_HOST_PROTOCOL     *This,
+  IN EFI_LBA                    Lba,
+  IN UINTN                      Length,
+  IN UINT32*                    Buffer
+  );
+
+BOOLEAN
+DwEmmcIsPowerOn (
+  VOID
+  )
+{
+    return TRUE;
+}
+
+EFI_STATUS
+DwEmmcInitialize (
+  VOID
+  )
+{
+    DEBUG ((DEBUG_BLKIO, "DwEmmcInitialize()"));
+    return EFI_SUCCESS;
+}
+
+BOOLEAN
+DwEmmcIsCardPresent (
+  IN EFI_MMC_HOST_PROTOCOL     *This
+  )
+{
+  return TRUE;
+}
+
+BOOLEAN
+DwEmmcIsReadOnly (
+  IN EFI_MMC_HOST_PROTOCOL     *This
+  )
+{
+  return FALSE;
+}
+
+BOOLEAN
+DwEmmcIsDmaSupported (
+  IN EFI_MMC_HOST_PROTOCOL     *This
+  )
+{
+  return TRUE;
+}
+
+EFI_STATUS
+DwEmmcBuildDevicePath (
+  IN EFI_MMC_HOST_PROTOCOL      *This,
+  IN EFI_DEVICE_PATH_PROTOCOL   **DevicePath
+  )
+{
+  EFI_DEVICE_PATH_PROTOCOL *NewDevicePathNode;
+
+  NewDevicePathNode = CreateDeviceNode (HARDWARE_DEVICE_PATH, HW_VENDOR_DP, sizeof (VENDOR_DEVICE_PATH));
+  CopyGuid (& ((VENDOR_DEVICE_PATH*)NewDevicePathNode)->Guid, &mDwEmmcDevicePathGuid);
+
+  *DevicePath = NewDevicePathNode;
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+DwEmmcUpdateClock (
+  VOID
+  )
+{
+  UINT32 Data;
+
+  /* CMD_UPDATE_CLK */
+  Data = BIT_CMD_WAIT_PRVDATA_COMPLETE | BIT_CMD_UPDATE_CLOCK_ONLY |
+         BIT_CMD_START;
+  MmioWrite32 (DWEMMC_CMD, Data);
+  while (1) {
+    Data = MmioRead32 (DWEMMC_CMD);
+    if (!(Data & CMD_START_BIT)) {
+      break;
+    }
+    Data = MmioRead32 (DWEMMC_RINTSTS);
+    if (Data & DWEMMC_INT_HLE) {
+      Print (L"failed to update mmc clock frequency\n");
+      return EFI_DEVICE_ERROR;
+    }
+  }
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+DwEmmcSetClock (
+  IN UINTN                     ClockFreq
+  )
+{
+  UINT32 Divider, Rate, Data;
+  EFI_STATUS Status;
+  BOOLEAN Found = FALSE;
+
+  for (Divider = 1; Divider < 256; Divider++) {
+    Rate = PcdGet32 (PcdDwEmmcDxeClockFrequencyInHz);
+    if ((Rate / (2 * Divider)) <= ClockFreq) {
+      Found = TRUE;
+      break;
+    }
+  }
+  if (Found == FALSE) {
+    return EFI_NOT_FOUND;
+  }
+
+  // Wait until MMC is idle
+  do {
+    Data = MmioRead32 (DWEMMC_STATUS);
+  } while (Data & DWEMMC_STS_DATA_BUSY);
+
+  // Disable MMC clock first
+  MmioWrite32 (DWEMMC_CLKENA, 0);
+  Status = DwEmmcUpdateClock ();
+  ASSERT (!EFI_ERROR (Status));
+
+  MmioWrite32 (DWEMMC_CLKDIV, Divider);
+  Status = DwEmmcUpdateClock ();
+  ASSERT (!EFI_ERROR (Status));
+
+  // Enable MMC clock
+  MmioWrite32 (DWEMMC_CLKENA, 1);
+  MmioWrite32 (DWEMMC_CLKSRC, 0);
+  Status = DwEmmcUpdateClock ();
+  ASSERT (!EFI_ERROR (Status));
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+DwEmmcNotifyState (
+  IN EFI_MMC_HOST_PROTOCOL     *This,
+  IN MMC_STATE                 State
+  )
+{
+  UINT32      Data;
+  EFI_STATUS  Status;
+
+  switch (State) {
+  case MmcInvalidState:
+    return EFI_INVALID_PARAMETER;
+  case MmcHwInitializationState:
+    MmioWrite32 (DWEMMC_PWREN, 1);
+
+    // If device already turn on then restart it
+    Data = DWEMMC_CTRL_RESET_ALL;
+    MmioWrite32 (DWEMMC_CTRL, Data);
+    do {
+      // Wait until reset operation finished
+      Data = MmioRead32 (DWEMMC_CTRL);
+    } while (Data & DWEMMC_CTRL_RESET_ALL);
+
+    // Setup clock that could not be higher than 400KHz.
+    Status = DwEmmcSetClock (400000);
+    ASSERT (!EFI_ERROR (Status));
+    // Wait clock stable
+    MicroSecondDelay (100);
+
+    MmioWrite32 (DWEMMC_RINTSTS, ~0);
+    MmioWrite32 (DWEMMC_INTMASK, 0);
+    MmioWrite32 (DWEMMC_TMOUT, ~0);
+    MmioWrite32 (DWEMMC_IDINTEN, 0);
+    MmioWrite32 (DWEMMC_BMOD, DWEMMC_IDMAC_SWRESET);
+
+    MmioWrite32 (DWEMMC_BLKSIZ, DWEMMC_BLOCK_SIZE);
+    do {
+      Data = MmioRead32 (DWEMMC_BMOD);
+    } while (Data & DWEMMC_IDMAC_SWRESET);
+    break;
+  case MmcIdleState:
+    break;
+  case MmcReadyState:
+    break;
+  case MmcIdentificationState:
+    break;
+  case MmcStandByState:
+    break;
+  case MmcTransferState:
+    break;
+  case MmcSendingDataState:
+    break;
+  case MmcReceiveDataState:
+    break;
+  case MmcProgrammingState:
+    break;
+  case MmcDisconnectState:
+    break;
+  default:
+    return EFI_INVALID_PARAMETER;
+  }
+  return EFI_SUCCESS;
+}
+
+// Need to prepare DMA buffer first before sending commands to MMC card
+BOOLEAN
+IsPendingReadCommand (
+  IN MMC_CMD                    MmcCmd
+  )
+{
+  UINTN  Mask;
+
+  Mask = BIT_CMD_DATA_EXPECTED | BIT_CMD_READ;
+  if ((MmcCmd & Mask) == Mask) {
+    return TRUE;
+  }
+  return FALSE;
+}
+
+BOOLEAN
+IsPendingWriteCommand (
+  IN MMC_CMD                    MmcCmd
+  )
+{
+  UINTN  Mask;
+
+  Mask = BIT_CMD_DATA_EXPECTED | BIT_CMD_WRITE;
+  if ((MmcCmd & Mask) == Mask) {
+    return TRUE;
+  }
+  return FALSE;
+}
+
+EFI_STATUS
+SendCommand (
+  IN MMC_CMD                    MmcCmd,
+  IN UINT32                     Argument
+  )
+{
+  UINT32      Data, ErrMask;
+
+  // Wait until MMC is idle
+  do {
+    Data = MmioRead32 (DWEMMC_STATUS);
+  } while (Data & DWEMMC_STS_DATA_BUSY);
+
+  MmioWrite32 (DWEMMC_RINTSTS, ~0);
+  MmioWrite32 (DWEMMC_CMDARG, Argument);
+  MmioWrite32 (DWEMMC_CMD, MmcCmd);
+
+  ErrMask = DWEMMC_INT_EBE | DWEMMC_INT_HLE | DWEMMC_INT_RTO |
+            DWEMMC_INT_RCRC | DWEMMC_INT_RE;
+  ErrMask |= DWEMMC_INT_DCRC | DWEMMC_INT_DRT | DWEMMC_INT_SBE;
+  do {
+    MicroSecondDelay(500);
+    Data = MmioRead32 (DWEMMC_RINTSTS);
+
+    if (Data & ErrMask) {
+      return EFI_DEVICE_ERROR;
+    }
+    if (Data & DWEMMC_INT_DTO) {     // Transfer Done
+      break;
+    }
+  } while (!(Data & DWEMMC_INT_CMD_DONE));
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+DwEmmcSendCommand (
+  IN EFI_MMC_HOST_PROTOCOL     *This,
+  IN MMC_CMD                    MmcCmd,
+  IN UINT32                     Argument
+  )
+{
+  UINT32       Cmd = 0;
+  EFI_STATUS   Status = EFI_SUCCESS;
+
+  switch (MMC_GET_INDX(MmcCmd)) {
+  case MMC_INDX(0):
+    Cmd = BIT_CMD_SEND_INIT;
+    break;
+  case MMC_INDX(1):
+    Cmd = BIT_CMD_RESPONSE_EXPECT;
+    break;
+  case MMC_INDX(2):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_LONG_RESPONSE |
+           BIT_CMD_CHECK_RESPONSE_CRC | BIT_CMD_SEND_INIT;
+    break;
+  case MMC_INDX(3):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
+           BIT_CMD_SEND_INIT;
+    break;
+  case MMC_INDX(7):
+    if (Argument)
+        Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC;
+    else
+        Cmd = 0;
+    break;
+  case MMC_INDX(8):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
+           BIT_CMD_DATA_EXPECTED | BIT_CMD_READ |
+           BIT_CMD_WAIT_PRVDATA_COMPLETE;
+    break;
+  case MMC_INDX(9):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
+           BIT_CMD_LONG_RESPONSE;
+    break;
+  case MMC_INDX(12):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
+           BIT_CMD_STOP_ABORT_CMD;
+    break;
+  case MMC_INDX(13):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
+           BIT_CMD_WAIT_PRVDATA_COMPLETE;
+    break;
+  case MMC_INDX(16):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
+           BIT_CMD_DATA_EXPECTED | BIT_CMD_READ |
+           BIT_CMD_WAIT_PRVDATA_COMPLETE;
+    break;
+  case MMC_INDX(17):
+  case MMC_INDX(18):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
+           BIT_CMD_DATA_EXPECTED | BIT_CMD_READ |
+           BIT_CMD_WAIT_PRVDATA_COMPLETE;
+    break;
+  case MMC_INDX(24):
+  case MMC_INDX(25):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
+           BIT_CMD_DATA_EXPECTED | BIT_CMD_WRITE |
+           BIT_CMD_WAIT_PRVDATA_COMPLETE;
+    break;
+  case MMC_INDX(30):
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC |
+           BIT_CMD_DATA_EXPECTED;
+    break;
+  default:
+    Cmd = BIT_CMD_RESPONSE_EXPECT | BIT_CMD_CHECK_RESPONSE_CRC;
+    break;
+  }
+
+  Cmd |= MMC_GET_INDX(MmcCmd) | BIT_CMD_USE_HOLD_REG | BIT_CMD_START;
+  if (IsPendingReadCommand (Cmd) || IsPendingWriteCommand (Cmd)) {
+    mDwEmmcCommand = Cmd;
+    mDwEmmcArgument = Argument;
+  } else {
+    Status = SendCommand (Cmd, Argument);
+  }
+  return Status;
+}
+
+EFI_STATUS
+DwEmmcReceiveResponse (
+  IN EFI_MMC_HOST_PROTOCOL     *This,
+  IN MMC_RESPONSE_TYPE          Type,
+  IN UINT32*                    Buffer
+  )
+{
+  if (Buffer == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (   (Type == MMC_RESPONSE_TYPE_R1)
+      || (Type == MMC_RESPONSE_TYPE_R1b)
+      || (Type == MMC_RESPONSE_TYPE_R3)
+      || (Type == MMC_RESPONSE_TYPE_R6)
+      || (Type == MMC_RESPONSE_TYPE_R7))
+  {
+    Buffer[0] = MmioRead32 (DWEMMC_RESP0);
+  } else if (Type == MMC_RESPONSE_TYPE_R2) {
+    Buffer[0] = MmioRead32 (DWEMMC_RESP0);
+    Buffer[1] = MmioRead32 (DWEMMC_RESP1);
+    Buffer[2] = MmioRead32 (DWEMMC_RESP2);
+    Buffer[3] = MmioRead32 (DWEMMC_RESP3);
+  }
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+PrepareDmaData (
+  IN DWEMMC_IDMAC_DESCRIPTOR*    IdmacDesc,
+  IN UINTN                      Length,
+  IN UINT32*                    Buffer
+  )
+{
+  UINTN  Cnt, Blks, Idx, LastIdx;
+
+  Cnt = (Length + DWEMMC_DMA_BUF_SIZE - 1) / DWEMMC_DMA_BUF_SIZE;
+  Blks = (Length + DWEMMC_BLOCK_SIZE - 1) / DWEMMC_BLOCK_SIZE;
+  Length = DWEMMC_BLOCK_SIZE * Blks;
+
+  for (Idx = 0; Idx < Cnt; Idx++) {
+    (IdmacDesc + Idx)->Des0 = DWEMMC_IDMAC_DES0_OWN | DWEMMC_IDMAC_DES0_CH |
+                              DWEMMC_IDMAC_DES0_DIC;
+    (IdmacDesc + Idx)->Des1 = DWEMMC_IDMAC_DES1_BS1(DWEMMC_DMA_BUF_SIZE);
+    /* Buffer Address */
+    (IdmacDesc + Idx)->Des2 = (UINT32)((UINTN)Buffer + DWEMMC_DMA_BUF_SIZE * Idx);
+    /* Next Descriptor Address */
+    (IdmacDesc + Idx)->Des3 = (UINT32)((UINTN)IdmacDesc +
+                                       (sizeof(DWEMMC_IDMAC_DESCRIPTOR) * (Idx + 1)));
+  }
+  /* First Descriptor */
+  IdmacDesc->Des0 |= DWEMMC_IDMAC_DES0_FS;
+  /* Last Descriptor */
+  LastIdx = Cnt - 1;
+  (IdmacDesc + LastIdx)->Des0 |= DWEMMC_IDMAC_DES0_LD;
+  (IdmacDesc + LastIdx)->Des0 &= ~(DWEMMC_IDMAC_DES0_DIC | DWEMMC_IDMAC_DES0_CH);
+  (IdmacDesc + LastIdx)->Des1 = DWEMMC_IDMAC_DES1_BS1(Length -
+                                                      (LastIdx * DWEMMC_DMA_BUF_SIZE));
+  /* Set the Next field of Last Descriptor */
+  (IdmacDesc + LastIdx)->Des3 = 0;
+  MmioWrite32 (DWEMMC_DBADDR, (UINT32)((UINTN)IdmacDesc));
+
+  return EFI_SUCCESS;
+}
+
+VOID
+StartDma (
+  UINTN    Length
+  )
+{
+  UINT32 Data;
+
+  Data = MmioRead32 (DWEMMC_CTRL);
+  Data |= DWEMMC_CTRL_INT_EN | DWEMMC_CTRL_DMA_EN | DWEMMC_CTRL_IDMAC_EN;
+  MmioWrite32 (DWEMMC_CTRL, Data);
+  Data = MmioRead32 (DWEMMC_BMOD);
+  Data |= DWEMMC_IDMAC_ENABLE | DWEMMC_IDMAC_FB;
+  MmioWrite32 (DWEMMC_BMOD, Data);
+
+  MmioWrite32 (DWEMMC_BLKSIZ, DWEMMC_BLOCK_SIZE);
+  MmioWrite32 (DWEMMC_BYTCNT, Length);
+}
+
+EFI_STATUS
+DwEmmcReadBlockData (
+  IN EFI_MMC_HOST_PROTOCOL     *This,
+  IN EFI_LBA                    Lba,
+  IN UINTN                      Length,
+  IN UINT32*                   Buffer
+  )
+{
+  EFI_STATUS  Status;
+  UINT32      DescPages, CountPerPage, Count;
+  EFI_TPL     Tpl;
+
+  Tpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+  CountPerPage = EFI_PAGE_SIZE / 16;
+  Count = (Length + DWEMMC_DMA_BUF_SIZE - 1) / DWEMMC_DMA_BUF_SIZE;
+  DescPages = (Count + CountPerPage - 1) / CountPerPage;
+
+  InvalidateDataCacheRange (Buffer, Length);
+
+  Status = PrepareDmaData (gpIdmacDesc, Length, Buffer);
+  if (EFI_ERROR (Status)) {
+    goto out;
+  }
+
+  WriteBackDataCacheRange (gpIdmacDesc, DescPages * EFI_PAGE_SIZE);
+  StartDma (Length);
+
+  Status = SendCommand (mDwEmmcCommand, mDwEmmcArgument);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "Failed to read data, mDwEmmcCommand:%x, mDwEmmcArgument:%x, Status:%r\n", mDwEmmcCommand, mDwEmmcArgument, Status));
+    goto out;
+  }
+out:
+  // Restore Tpl
+  gBS->RestoreTPL (Tpl);
+  return Status;
+}
+
+EFI_STATUS
+DwEmmcWriteBlockData (
+  IN EFI_MMC_HOST_PROTOCOL     *This,
+  IN EFI_LBA                    Lba,
+  IN UINTN                      Length,
+  IN UINT32*                    Buffer
+  )
+{
+  EFI_STATUS  Status;
+  UINT32      DescPages, CountPerPage, Count;
+  EFI_TPL     Tpl;
+
+  Tpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+  CountPerPage = EFI_PAGE_SIZE / 16;
+  Count = (Length + DWEMMC_DMA_BUF_SIZE - 1) / DWEMMC_DMA_BUF_SIZE;
+  DescPages = (Count + CountPerPage - 1) / CountPerPage;
+
+  WriteBackDataCacheRange (Buffer, Length);
+
+  Status = PrepareDmaData (gpIdmacDesc, Length, Buffer);
+  if (EFI_ERROR (Status)) {
+    goto out;
+  }
+
+  WriteBackDataCacheRange (gpIdmacDesc, DescPages * EFI_PAGE_SIZE);
+  StartDma (Length);
+
+  Status = SendCommand (mDwEmmcCommand, mDwEmmcArgument);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "Failed to write data, mDwEmmcCommand:%x, mDwEmmcArgument:%x, Status:%r\n", mDwEmmcCommand, mDwEmmcArgument, Status));
+    goto out;
+  }
+out:
+  // Restore Tpl
+  gBS->RestoreTPL (Tpl);
+  return Status;
+}
+
+EFI_STATUS
+DwEmmcSetIos (
+  IN EFI_MMC_HOST_PROTOCOL      *This,
+  IN  UINT32                    BusClockFreq,
+  IN  UINT32                    BusWidth,
+  IN  UINT32                    TimingMode
+  )
+{
+  EFI_STATUS Status = EFI_SUCCESS;
+  UINT32    Data;
+
+  if (TimingMode != EMMCBACKWARD) {
+    Data = MmioRead32 (DWEMMC_UHSREG);
+    switch (TimingMode) {
+    case EMMCHS52DDR1V2:
+    case EMMCHS52DDR1V8:
+      Data |= 1 << 16;
+      break;
+    case EMMCHS52:
+    case EMMCHS26:
+      Data &= ~(1 << 16);
+      break;
+    default:
+      return EFI_UNSUPPORTED;
+    }
+    MmioWrite32 (DWEMMC_UHSREG, Data);
+  }
+
+  switch (BusWidth) {
+  case 1:
+    MmioWrite32 (DWEMMC_CTYPE, 0);
+    break;
+  case 4:
+    MmioWrite32 (DWEMMC_CTYPE, 1);
+    break;
+  case 8:
+    MmioWrite32 (DWEMMC_CTYPE, 1 << 16);
+    break;
+  default:
+    return EFI_UNSUPPORTED;
+  }
+  if (BusClockFreq) {
+    Status = DwEmmcSetClock (BusClockFreq);
+  }
+  return Status;
+}
+
+BOOLEAN
+DwEmmcIsMultiBlock (
+  IN EFI_MMC_HOST_PROTOCOL      *This
+  )
+{
+  return TRUE;
+}
+
+EFI_MMC_HOST_PROTOCOL gMciHost = {
+  MMC_HOST_PROTOCOL_REVISION,
+  DwEmmcIsCardPresent,
+  DwEmmcIsReadOnly,
+  DwEmmcBuildDevicePath,
+  DwEmmcNotifyState,
+  DwEmmcSendCommand,
+  DwEmmcReceiveResponse,
+  DwEmmcReadBlockData,
+  DwEmmcWriteBlockData,
+  DwEmmcSetIos,
+  DwEmmcIsMultiBlock
+};
+
+EFI_STATUS
+DwEmmcDxeInitialize (
+  IN EFI_HANDLE         ImageHandle,
+  IN EFI_SYSTEM_TABLE   *SystemTable
+  )
+{
+  EFI_STATUS    Status;
+  EFI_HANDLE    Handle;
+
+  Handle = NULL;
+
+  gpIdmacDesc = (DWEMMC_IDMAC_DESCRIPTOR *)AllocatePages (DWEMMC_MAX_DESC_PAGES);
+  if (gpIdmacDesc == NULL) {
+    return EFI_BUFFER_TOO_SMALL;
+  }
+
+  DEBUG ((DEBUG_BLKIO, "DwEmmcDxeInitialize()\n"));
+
+  //Publish Component Name, BlockIO protocol interfaces
+  Status = gBS->InstallMultipleProtocolInterfaces (
+                  &Handle,
+                  &gEfiMmcHostProtocolGuid,         &gMciHost,
+                  NULL
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+  return EFI_SUCCESS;
+}