EmbeddedPkg/Universal/MmcDxe/Mmc.c - device/linaro/bootloader/edk2 - Git at Google

 /** @file
   Main file of the MMC Dxe driver. The driver entrypoint is defined into this file.

   Copyright (c) 2011-2013, ARM 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 <Protocol/DevicePath.h>

 #include <Library/BaseLib.h>
 #include <Library/BaseMemoryLib.h>
 #include <Library/MemoryAllocationLib.h>
 #include <Library/UefiBootServicesTableLib.h>
 #include <Library/DevicePathLib.h>

 #include "Mmc.h"

 EFI_BLOCK_IO_MEDIA mMmcMediaTemplate = {
   SIGNATURE_32('m','m','c','o'),            // MediaId
   TRUE,                                     // RemovableMedia
   FALSE,                                    // MediaPresent
   FALSE,                                    // LogicalPartition
   FALSE,                                    // ReadOnly
   FALSE,                                    // WriteCaching
   512,                                      // BlockSize
   4,                                        // IoAlign
   0,                                        // Pad
   0                                         // LastBlock
 };

 //
 // This device structure is serviced as a header.
 // Its next field points to the first root bridge device node.
 //
 LIST_ENTRY  mMmcHostPool;

 /**
   Event triggered by the timer to check if any cards have been removed
   or if new ones have been plugged in
 **/

 EFI_EVENT gCheckCardsEvent;

 /**
   Initialize the MMC Host Pool to support multiple MMC devices
 **/
 VOID
 InitializeMmcHostPool (
   VOID
   )
 {
   InitializeListHead (&mMmcHostPool);
 }

 /**
   Insert a new Mmc Host controller to the pool
 **/
 VOID
 InsertMmcHost (
   IN MMC_HOST_INSTANCE      *MmcHostInstance
   )
 {
   InsertTailList (&mMmcHostPool, &(MmcHostInstance->Link));
 }

 /*
   Remove a new Mmc Host controller to the pool
 */
 VOID
 RemoveMmcHost (
   IN MMC_HOST_INSTANCE      *MmcHostInstance
   )
 {
   RemoveEntryList (&(MmcHostInstance->Link));
 }

 MMC_HOST_INSTANCE* CreateMmcHostInstance (
   IN EFI_MMC_HOST_PROTOCOL* MmcHost
   )
 {
   EFI_STATUS          Status;
   MMC_HOST_INSTANCE*  MmcHostInstance;
   EFI_DEVICE_PATH_PROTOCOL    *NewDevicePathNode;
   EFI_DEVICE_PATH_PROTOCOL    *DevicePath;

   MmcHostInstance = AllocateZeroPool (sizeof (MMC_HOST_INSTANCE));
   if (MmcHostInstance == NULL) {
     return NULL;
   }

   MmcHostInstance->Signature = MMC_HOST_INSTANCE_SIGNATURE;

   MmcHostInstance->State = MmcHwInitializationState;

   MmcHostInstance->BlockIo.Media = AllocateCopyPool (sizeof(EFI_BLOCK_IO_MEDIA), &mMmcMediaTemplate);
   if (MmcHostInstance->BlockIo.Media == NULL) {
     goto FREE_INSTANCE;
   }

   MmcHostInstance->BlockIo.Revision = EFI_BLOCK_IO_INTERFACE_REVISION;
   MmcHostInstance->BlockIo.Reset = MmcReset;
   MmcHostInstance->BlockIo.ReadBlocks = MmcReadBlocks;
   MmcHostInstance->BlockIo.WriteBlocks = MmcWriteBlocks;
   MmcHostInstance->BlockIo.FlushBlocks = MmcFlushBlocks;

   MmcHostInstance->EraseBlockProtocol.Revision = EFI_ERASE_BLOCK_PROTOCOL_REVISION;
   MmcHostInstance->EraseBlockProtocol.EraseLengthGranularity = 1; //TO BE CHANGED, SHIVA
   MmcHostInstance->EraseBlockProtocol.EraseBlocks = MmcEraseBlocks;

   MmcHostInstance->MmcHost = MmcHost;

   // Create DevicePath for the new MMC Host
   Status = MmcHost->BuildDevicePath (MmcHost, &NewDevicePathNode);
   if (EFI_ERROR (Status)) {
     goto FREE_MEDIA;
   }

   DevicePath = (EFI_DEVICE_PATH_PROTOCOL *) AllocatePool (END_DEVICE_PATH_LENGTH);
   if (DevicePath == NULL) {
     goto FREE_MEDIA;
   }

   SetDevicePathEndNode (DevicePath);
   MmcHostInstance->DevicePath = AppendDevicePathNode (DevicePath, NewDevicePathNode);

   // Publish BlockIO protocol interface
   Status = gBS->InstallMultipleProtocolInterfaces (
                 &MmcHostInstance->MmcHandle,
                 &gEfiBlockIoProtocolGuid,&MmcHostInstance->BlockIo,
                 &gEfiEraseBlockProtocolGuid,&MmcHostInstance->EraseBlockProtocol,
                 &gEfiDevicePathProtocolGuid,MmcHostInstance->DevicePath,
                 NULL
                 );
   if (EFI_ERROR(Status)) {
     goto FREE_DEVICE_PATH;
   }

   return MmcHostInstance;

 FREE_DEVICE_PATH:
   FreePool(DevicePath);

 FREE_MEDIA:
   FreePool(MmcHostInstance->BlockIo.Media);

 FREE_INSTANCE:
   FreePool(MmcHostInstance);

   return NULL;
 }

 EFI_STATUS DestroyMmcHostInstance (
   IN MMC_HOST_INSTANCE* MmcHostInstance
   )
 {
   EFI_STATUS Status;

   // Uninstall Protocol Interfaces
   Status = gBS->UninstallMultipleProtocolInterfaces (
         MmcHostInstance->MmcHandle,
         &gEfiBlockIoProtocolGuid,&(MmcHostInstance->BlockIo),
         &gEfiEraseBlockProtocolGuid,&MmcHostInstance->EraseBlockProtocol,
         &gEfiDevicePathProtocolGuid,MmcHostInstance->DevicePath,
         NULL
         );
   ASSERT_EFI_ERROR (Status);

   // Free Memory allocated for the instance
   if (MmcHostInstance->BlockIo.Media) {
     FreePool(MmcHostInstance->BlockIo.Media);
   }
   FreePool (MmcHostInstance);

   return Status;
 }

 /**
   This function checks if the controller implement the Mmc Host and the Device Path Protocols
 **/
 EFI_STATUS
 EFIAPI
 MmcDriverBindingSupported (
   IN EFI_DRIVER_BINDING_PROTOCOL    *This,
   IN EFI_HANDLE                     Controller,
   IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath
   )
 {
   EFI_STATUS                      Status;
   //EFI_DEVICE_PATH_PROTOCOL        *ParentDevicePath;
   EFI_MMC_HOST_PROTOCOL           *MmcHost;
   EFI_DEV_PATH_PTR                Node;

   //
   // Check RemainingDevicePath validation
   //
   if (RemainingDevicePath != NULL) {
     //
     // Check if RemainingDevicePath is the End of Device Path Node,
     // if yes, go on checking other conditions
     //
     if (!IsDevicePathEnd (RemainingDevicePath)) {
       //
       // If RemainingDevicePath isn't the End of Device Path Node,
       // check its validation
       //
       Node.DevPath = RemainingDevicePath;
       if (Node.DevPath->Type != HARDWARE_DEVICE_PATH ||
         Node.DevPath->SubType != HW_VENDOR_DP      ||
         DevicePathNodeLength(Node.DevPath) != sizeof(VENDOR_DEVICE_PATH)) {
           return EFI_UNSUPPORTED;
       }
     }
   }

   //
   // Check if Mmc Host protocol is installed by platform
   //
   Status = gBS->OpenProtocol (
                 Controller,
                 &gEfiMmcHostProtocolGuid,
                 (VOID **) &MmcHost,
                 This->DriverBindingHandle,
                 Controller,
                 EFI_OPEN_PROTOCOL_BY_DRIVER
                 );
   if (Status == EFI_ALREADY_STARTED) {
     return EFI_SUCCESS;
   }
   if (EFI_ERROR (Status)) {
     return Status;
   }

   //
   // Close the Mmc Host used to perform the supported test
   //
   gBS->CloseProtocol (
       Controller,
       &gEfiMmcHostProtocolGuid,
       This->DriverBindingHandle,
       Controller
       );

   return EFI_SUCCESS;
 }

 /**

 **/
 EFI_STATUS
 EFIAPI
 MmcDriverBindingStart (
   IN EFI_DRIVER_BINDING_PROTOCOL  *This,
   IN EFI_HANDLE                   Controller,
   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
   )
 {
   EFI_STATUS              Status;
   MMC_HOST_INSTANCE       *MmcHostInstance;
   EFI_MMC_HOST_PROTOCOL   *MmcHost;

   //
   // Check RemainingDevicePath validation
   //
   if (RemainingDevicePath != NULL) {
     //
     // Check if RemainingDevicePath is the End of Device Path Node,
     // if yes, return EFI_SUCCESS
     //
     if (IsDevicePathEnd (RemainingDevicePath)) {
       return EFI_SUCCESS;
     }
   }

   //
   // Get the Mmc Host protocol
   //
   Status = gBS->OpenProtocol (
                 Controller,
                 &gEfiMmcHostProtocolGuid,
                 (VOID **) &MmcHost,
                 This->DriverBindingHandle,
                 Controller,
                 EFI_OPEN_PROTOCOL_BY_DRIVER
                 );
   if (EFI_ERROR (Status)) {
     if (Status == EFI_ALREADY_STARTED) {
       return EFI_SUCCESS;
     }
     return Status;
   }

   MmcHostInstance = CreateMmcHostInstance(MmcHost);
   if (MmcHostInstance != NULL) {
     // Add the handle to the pool
     InsertMmcHost (MmcHostInstance);

     MmcHostInstance->Initialized = FALSE;

     // Detect card presence now
     CheckCardsCallback (NULL, NULL);
   }

   return EFI_SUCCESS;
 }

 /**

 **/
 EFI_STATUS
 EFIAPI
 MmcDriverBindingStop (
   IN  EFI_DRIVER_BINDING_PROTOCOL   *This,
   IN  EFI_HANDLE                    Controller,
   IN  UINTN                         NumberOfChildren,
   IN  EFI_HANDLE                    *ChildHandleBuffer
   )
 {
   EFI_STATUS          Status = EFI_SUCCESS;
   LIST_ENTRY          *CurrentLink;
   MMC_HOST_INSTANCE   *MmcHostInstance;

   MMC_TRACE("MmcDriverBindingStop()");

   // For each MMC instance
   CurrentLink = mMmcHostPool.ForwardLink;
   while (CurrentLink != NULL && CurrentLink != &mMmcHostPool && (Status == EFI_SUCCESS)) {
     MmcHostInstance = MMC_HOST_INSTANCE_FROM_LINK(CurrentLink);
     ASSERT(MmcHostInstance != NULL);

     // Close gEfiMmcHostProtocolGuid
     Status = gBS->CloseProtocol (
                 Controller,
                 &gEfiMmcHostProtocolGuid,(VOID **) &MmcHostInstance->MmcHost,
                 This->DriverBindingHandle
                 );

     // Remove MMC Host Instance from the pool
     RemoveMmcHost (MmcHostInstance);

     // Destroy MmcHostInstance
     DestroyMmcHostInstance (MmcHostInstance);
   }

   return Status;
 }

 VOID
 EFIAPI
 CheckCardsCallback (
   IN  EFI_EVENT   Event,
   IN  VOID        *Context
   )
 {
   LIST_ENTRY          *CurrentLink;
   MMC_HOST_INSTANCE   *MmcHostInstance;
   EFI_STATUS          Status;

   CurrentLink = mMmcHostPool.ForwardLink;
   while (CurrentLink != NULL && CurrentLink != &mMmcHostPool) {
     MmcHostInstance = MMC_HOST_INSTANCE_FROM_LINK(CurrentLink);
     ASSERT(MmcHostInstance != NULL);

     if (MmcHostInstance->MmcHost->IsCardPresent (MmcHostInstance->MmcHost) == !MmcHostInstance->Initialized) {
       MmcHostInstance->State = MmcHwInitializationState;
       MmcHostInstance->BlockIo.Media->MediaPresent = !MmcHostInstance->Initialized;
       MmcHostInstance->Initialized = !MmcHostInstance->Initialized;

       if (MmcHostInstance->BlockIo.Media->MediaPresent) {
         InitializeMmcDevice (MmcHostInstance);
       }

       Status = gBS->ReinstallProtocolInterface (
                     (MmcHostInstance->MmcHandle),
                     &gEfiBlockIoProtocolGuid,
                     &(MmcHostInstance->BlockIo),
                     &(MmcHostInstance->BlockIo)
                     );
       Status = gBS->ReinstallProtocolInterface (
                     (MmcHostInstance->MmcHandle),
                     &gEfiEraseBlockProtocolGuid,
                     &(MmcHostInstance->EraseBlockProtocol),
                     &(MmcHostInstance->EraseBlockProtocol)
                     );

       if (EFI_ERROR(Status)) {
         Print(L"MMC Card: Error reinstalling BlockIo interface\n");
       }
     }

     CurrentLink = CurrentLink->ForwardLink;
   }
 }


 EFI_DRIVER_BINDING_PROTOCOL gMmcDriverBinding = {
   MmcDriverBindingSupported,
   MmcDriverBindingStart,
   MmcDriverBindingStop,
   0xa,
   NULL,
   NULL
 };

 /**

 **/
 EFI_STATUS
 EFIAPI
 MmcDxeInitialize (
   IN EFI_HANDLE         ImageHandle,
   IN EFI_SYSTEM_TABLE   *SystemTable
   )
 {
   EFI_STATUS  Status;

   //
   // Initializes MMC Host pool
   //
   InitializeMmcHostPool ();

   //
   // Install driver model protocol(s).
   //
   Status = EfiLibInstallDriverBindingComponentName2 (
            ImageHandle,
            SystemTable,
            &gMmcDriverBinding,
            ImageHandle,
            &gMmcComponentName,
            &gMmcComponentName2
            );
   ASSERT_EFI_ERROR (Status);

   // Install driver diagnostics
   Status = gBS->InstallMultipleProtocolInterfaces (
                 &ImageHandle,
                 &gEfiDriverDiagnostics2ProtocolGuid,&gMmcDriverDiagnostics2,
                 NULL
                 );
   ASSERT_EFI_ERROR (Status);

   // Use a timer to detect if a card has been plugged in or removed
   Status = gBS->CreateEvent (
                 EVT_NOTIFY_SIGNAL | EVT_TIMER,
                 TPL_CALLBACK,
                 CheckCardsCallback,
                 NULL,
                 &gCheckCardsEvent);
   ASSERT_EFI_ERROR (Status);

   Status = gBS->SetTimer(
                 gCheckCardsEvent,
                 TimerPeriodic,
                 (UINT64)(10*1000*200)); // 200 ms
   ASSERT_EFI_ERROR (Status);

   return Status;
 }
	/** @file
	Main file of the MMC Dxe driver. The driver entrypoint is defined into this file.

	Copyright (c) 2011-2013, ARM 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 <Protocol/DevicePath.h>

	#include <Library/BaseLib.h>
	#include <Library/BaseMemoryLib.h>
	#include <Library/MemoryAllocationLib.h>
	#include <Library/UefiBootServicesTableLib.h>
	#include <Library/DevicePathLib.h>

	#include "Mmc.h"

	EFI_BLOCK_IO_MEDIA mMmcMediaTemplate = {
	SIGNATURE_32('m','m','c','o'), // MediaId
	TRUE, // RemovableMedia
	FALSE, // MediaPresent
	FALSE, // LogicalPartition
	FALSE, // ReadOnly
	FALSE, // WriteCaching
	512, // BlockSize
	4, // IoAlign
	0, // Pad
	0 // LastBlock
	};

	//
	// This device structure is serviced as a header.
	// Its next field points to the first root bridge device node.
	//
	LIST_ENTRY mMmcHostPool;

	/**
	Event triggered by the timer to check if any cards have been removed
	or if new ones have been plugged in
	**/

	EFI_EVENT gCheckCardsEvent;

	/**
	Initialize the MMC Host Pool to support multiple MMC devices
	**/
	VOID
	InitializeMmcHostPool (
	VOID
	)
	{
	InitializeListHead (&mMmcHostPool);
	}

	/**
	Insert a new Mmc Host controller to the pool
	**/
	VOID
	InsertMmcHost (
	IN MMC_HOST_INSTANCE *MmcHostInstance
	)
	{
	InsertTailList (&mMmcHostPool, &(MmcHostInstance->Link));
	}

	/*
	Remove a new Mmc Host controller to the pool
	*/
	VOID
	RemoveMmcHost (
	IN MMC_HOST_INSTANCE *MmcHostInstance
	)
	{
	RemoveEntryList (&(MmcHostInstance->Link));
	}

	MMC_HOST_INSTANCE* CreateMmcHostInstance (
	IN EFI_MMC_HOST_PROTOCOL* MmcHost
	)
	{
	EFI_STATUS Status;
	MMC_HOST_INSTANCE* MmcHostInstance;
	EFI_DEVICE_PATH_PROTOCOL *NewDevicePathNode;
	EFI_DEVICE_PATH_PROTOCOL *DevicePath;

	MmcHostInstance = AllocateZeroPool (sizeof (MMC_HOST_INSTANCE));
	if (MmcHostInstance == NULL) {
	return NULL;
	}

	MmcHostInstance->Signature = MMC_HOST_INSTANCE_SIGNATURE;

	MmcHostInstance->State = MmcHwInitializationState;

	MmcHostInstance->BlockIo.Media = AllocateCopyPool (sizeof(EFI_BLOCK_IO_MEDIA), &mMmcMediaTemplate);
	if (MmcHostInstance->BlockIo.Media == NULL) {
	goto FREE_INSTANCE;
	}

	MmcHostInstance->BlockIo.Revision = EFI_BLOCK_IO_INTERFACE_REVISION;
	MmcHostInstance->BlockIo.Reset = MmcReset;
	MmcHostInstance->BlockIo.ReadBlocks = MmcReadBlocks;
	MmcHostInstance->BlockIo.WriteBlocks = MmcWriteBlocks;
	MmcHostInstance->BlockIo.FlushBlocks = MmcFlushBlocks;

	MmcHostInstance->EraseBlockProtocol.Revision = EFI_ERASE_BLOCK_PROTOCOL_REVISION;
	MmcHostInstance->EraseBlockProtocol.EraseLengthGranularity = 1; //TO BE CHANGED, SHIVA
	MmcHostInstance->EraseBlockProtocol.EraseBlocks = MmcEraseBlocks;

	MmcHostInstance->MmcHost = MmcHost;

	// Create DevicePath for the new MMC Host
	Status = MmcHost->BuildDevicePath (MmcHost, &NewDevicePathNode);
	if (EFI_ERROR (Status)) {
	goto FREE_MEDIA;
	}

	DevicePath = (EFI_DEVICE_PATH_PROTOCOL *) AllocatePool (END_DEVICE_PATH_LENGTH);
	if (DevicePath == NULL) {
	goto FREE_MEDIA;
	}

	SetDevicePathEndNode (DevicePath);
	MmcHostInstance->DevicePath = AppendDevicePathNode (DevicePath, NewDevicePathNode);

	// Publish BlockIO protocol interface
	Status = gBS->InstallMultipleProtocolInterfaces (
	&MmcHostInstance->MmcHandle,
	&gEfiBlockIoProtocolGuid,&MmcHostInstance->BlockIo,
	&gEfiEraseBlockProtocolGuid,&MmcHostInstance->EraseBlockProtocol,
	&gEfiDevicePathProtocolGuid,MmcHostInstance->DevicePath,
	NULL
	);
	if (EFI_ERROR(Status)) {
	goto FREE_DEVICE_PATH;
	}

	return MmcHostInstance;

	FREE_DEVICE_PATH:
	FreePool(DevicePath);

	FREE_MEDIA:
	FreePool(MmcHostInstance->BlockIo.Media);

	FREE_INSTANCE:
	FreePool(MmcHostInstance);

	return NULL;
	}

	EFI_STATUS DestroyMmcHostInstance (
	IN MMC_HOST_INSTANCE* MmcHostInstance
	)
	{
	EFI_STATUS Status;

	// Uninstall Protocol Interfaces
	Status = gBS->UninstallMultipleProtocolInterfaces (
	MmcHostInstance->MmcHandle,
	&gEfiBlockIoProtocolGuid,&(MmcHostInstance->BlockIo),
	&gEfiEraseBlockProtocolGuid,&MmcHostInstance->EraseBlockProtocol,
	&gEfiDevicePathProtocolGuid,MmcHostInstance->DevicePath,
	NULL
	);
	ASSERT_EFI_ERROR (Status);

	// Free Memory allocated for the instance
	if (MmcHostInstance->BlockIo.Media) {
	FreePool(MmcHostInstance->BlockIo.Media);
	}
	FreePool (MmcHostInstance);

	return Status;
	}

	/**
	This function checks if the controller implement the Mmc Host and the Device Path Protocols
	**/
	EFI_STATUS
	EFIAPI
	MmcDriverBindingSupported (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller,
	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
	)
	{
	EFI_STATUS Status;
	//EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;
	EFI_MMC_HOST_PROTOCOL *MmcHost;
	EFI_DEV_PATH_PTR Node;

	//
	// Check RemainingDevicePath validation
	//
	if (RemainingDevicePath != NULL) {
	//
	// Check if RemainingDevicePath is the End of Device Path Node,
	// if yes, go on checking other conditions
	//
	if (!IsDevicePathEnd (RemainingDevicePath)) {
	//
	// If RemainingDevicePath isn't the End of Device Path Node,
	// check its validation
	//
	Node.DevPath = RemainingDevicePath;
	if (Node.DevPath->Type != HARDWARE_DEVICE_PATH \|\|
	Node.DevPath->SubType != HW_VENDOR_DP \|\|
	DevicePathNodeLength(Node.DevPath) != sizeof(VENDOR_DEVICE_PATH)) {
	return EFI_UNSUPPORTED;
	}
	}
	}

	//
	// Check if Mmc Host protocol is installed by platform
	//
	Status = gBS->OpenProtocol (
	Controller,
	&gEfiMmcHostProtocolGuid,
	(VOID **) &MmcHost,
	This->DriverBindingHandle,
	Controller,
	EFI_OPEN_PROTOCOL_BY_DRIVER
	);
	if (Status == EFI_ALREADY_STARTED) {
	return EFI_SUCCESS;
	}
	if (EFI_ERROR (Status)) {
	return Status;
	}

	//
	// Close the Mmc Host used to perform the supported test
	//
	gBS->CloseProtocol (
	Controller,
	&gEfiMmcHostProtocolGuid,
	This->DriverBindingHandle,
	Controller
	);

	return EFI_SUCCESS;
	}

	/**

	**/
	EFI_STATUS
	EFIAPI
	MmcDriverBindingStart (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller,
	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
	)
	{
	EFI_STATUS Status;
	MMC_HOST_INSTANCE *MmcHostInstance;
	EFI_MMC_HOST_PROTOCOL *MmcHost;

	//
	// Check RemainingDevicePath validation
	//
	if (RemainingDevicePath != NULL) {
	//
	// Check if RemainingDevicePath is the End of Device Path Node,
	// if yes, return EFI_SUCCESS
	//
	if (IsDevicePathEnd (RemainingDevicePath)) {
	return EFI_SUCCESS;
	}
	}

	//
	// Get the Mmc Host protocol
	//
	Status = gBS->OpenProtocol (
	Controller,
	&gEfiMmcHostProtocolGuid,
	(VOID **) &MmcHost,
	This->DriverBindingHandle,
	Controller,
	EFI_OPEN_PROTOCOL_BY_DRIVER
	);
	if (EFI_ERROR (Status)) {
	if (Status == EFI_ALREADY_STARTED) {
	return EFI_SUCCESS;
	}
	return Status;
	}

	MmcHostInstance = CreateMmcHostInstance(MmcHost);
	if (MmcHostInstance != NULL) {
	// Add the handle to the pool
	InsertMmcHost (MmcHostInstance);

	MmcHostInstance->Initialized = FALSE;

	// Detect card presence now
	CheckCardsCallback (NULL, NULL);
	}

	return EFI_SUCCESS;
	}

	/**

	**/
	EFI_STATUS
	EFIAPI
	MmcDriverBindingStop (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller,
	IN UINTN NumberOfChildren,
	IN EFI_HANDLE *ChildHandleBuffer
	)
	{
	EFI_STATUS Status = EFI_SUCCESS;
	LIST_ENTRY *CurrentLink;
	MMC_HOST_INSTANCE *MmcHostInstance;

	MMC_TRACE("MmcDriverBindingStop()");

	// For each MMC instance
	CurrentLink = mMmcHostPool.ForwardLink;
	while (CurrentLink != NULL && CurrentLink != &mMmcHostPool && (Status == EFI_SUCCESS)) {
	MmcHostInstance = MMC_HOST_INSTANCE_FROM_LINK(CurrentLink);
	ASSERT(MmcHostInstance != NULL);

	// Close gEfiMmcHostProtocolGuid
	Status = gBS->CloseProtocol (
	Controller,
	&gEfiMmcHostProtocolGuid,(VOID **) &MmcHostInstance->MmcHost,
	This->DriverBindingHandle
	);

	// Remove MMC Host Instance from the pool
	RemoveMmcHost (MmcHostInstance);

	// Destroy MmcHostInstance
	DestroyMmcHostInstance (MmcHostInstance);
	}

	return Status;
	}

	VOID
	EFIAPI
	CheckCardsCallback (
	IN EFI_EVENT Event,
	IN VOID *Context
	)
	{
	LIST_ENTRY *CurrentLink;
	MMC_HOST_INSTANCE *MmcHostInstance;
	EFI_STATUS Status;

	CurrentLink = mMmcHostPool.ForwardLink;
	while (CurrentLink != NULL && CurrentLink != &mMmcHostPool) {
	MmcHostInstance = MMC_HOST_INSTANCE_FROM_LINK(CurrentLink);
	ASSERT(MmcHostInstance != NULL);

	if (MmcHostInstance->MmcHost->IsCardPresent (MmcHostInstance->MmcHost) == !MmcHostInstance->Initialized) {
	MmcHostInstance->State = MmcHwInitializationState;
	MmcHostInstance->BlockIo.Media->MediaPresent = !MmcHostInstance->Initialized;
	MmcHostInstance->Initialized = !MmcHostInstance->Initialized;

	if (MmcHostInstance->BlockIo.Media->MediaPresent) {
	InitializeMmcDevice (MmcHostInstance);
	}

	Status = gBS->ReinstallProtocolInterface (
	(MmcHostInstance->MmcHandle),
	&gEfiBlockIoProtocolGuid,
	&(MmcHostInstance->BlockIo),
	&(MmcHostInstance->BlockIo)
	);
	Status = gBS->ReinstallProtocolInterface (
	(MmcHostInstance->MmcHandle),
	&gEfiEraseBlockProtocolGuid,
	&(MmcHostInstance->EraseBlockProtocol),
	&(MmcHostInstance->EraseBlockProtocol)
	);

	if (EFI_ERROR(Status)) {
	Print(L"MMC Card: Error reinstalling BlockIo interface\n");
	}
	}

	CurrentLink = CurrentLink->ForwardLink;
	}
	}


	EFI_DRIVER_BINDING_PROTOCOL gMmcDriverBinding = {
	MmcDriverBindingSupported,
	MmcDriverBindingStart,
	MmcDriverBindingStop,
	0xa,
	NULL,
	NULL
	};

	/**

	**/
	EFI_STATUS
	EFIAPI
	MmcDxeInitialize (
	IN EFI_HANDLE ImageHandle,
	IN EFI_SYSTEM_TABLE *SystemTable
	)
	{
	EFI_STATUS Status;

	//
	// Initializes MMC Host pool
	//
	InitializeMmcHostPool ();

	//
	// Install driver model protocol(s).
	//
	Status = EfiLibInstallDriverBindingComponentName2 (
	ImageHandle,
	SystemTable,
	&gMmcDriverBinding,
	ImageHandle,
	&gMmcComponentName,
	&gMmcComponentName2
	);
	ASSERT_EFI_ERROR (Status);

	// Install driver diagnostics
	Status = gBS->InstallMultipleProtocolInterfaces (
	&ImageHandle,
	&gEfiDriverDiagnostics2ProtocolGuid,&gMmcDriverDiagnostics2,
	NULL
	);
	ASSERT_EFI_ERROR (Status);

	// Use a timer to detect if a card has been plugged in or removed
	Status = gBS->CreateEvent (
	EVT_NOTIFY_SIGNAL \| EVT_TIMER,
	TPL_CALLBACK,
	CheckCardsCallback,
	NULL,
	&gCheckCardsEvent);
	ASSERT_EFI_ERROR (Status);

	Status = gBS->SetTimer(
	gCheckCardsEvent,
	TimerPeriodic,
	(UINT64)(101000200)); // 200 ms
	ASSERT_EFI_ERROR (Status);

	return Status;
	}