path: root/EmbeddedPkg/Universal/MmcDxe/Mmc.c

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

  Copyright (c) 2011, 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 <Protocol/MmcHost.h>

#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DevicePathLib.h>
#include <Library/DebugLib.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->MmcHost = MmcHost;

  // Create DevicePath for the new MMC Host
  Status = MmcHost->BuildDevicePath(&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,
                &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),
        &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;
  }

  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->Initialized) {
      MmcHostInstance->State = MmcHwInitializationState;
      MmcHostInstance->BlockIo.Media->MediaPresent = !MmcHostInstance->Initialized;
      MmcHostInstance->Initialized = !MmcHostInstance->Initialized;

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

      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;
}