/** @file
  Diagnostics Protocol implementation for the MMC DXE driver

  Copyright (c) 2011-2014, 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 <Uefi.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseLib.h>

#include "Mmc.h"

#define DIAGNOSTIC_LOGBUFFER_MAXCHAR  1024

CHAR16* mLogBuffer = NULL;
UINTN   mLogRemainChar = 0;

CHAR16*
DiagnosticInitLog (
  UINTN MaxBufferChar
  )
{
  mLogRemainChar = MaxBufferChar;
  mLogBuffer = AllocatePool ((UINTN)MaxBufferChar * sizeof (CHAR16));
  return mLogBuffer;
}

UINTN
DiagnosticLog (
  CONST CHAR16* Str
  )
{
  UINTN len = StrLen (Str);
  if (len <= mLogRemainChar) {
    mLogRemainChar -= len;
    StrCpy (mLogBuffer, Str);
    mLogBuffer += len;
    return len;
  } else {
    return 0;
  }
}

VOID
GenerateRandomBuffer (
  VOID* Buffer,
  UINTN BufferSize
  )
{
  UINT64  i;
  UINT64* Buffer64 = (UINT64*)Buffer;

  for (i = 0; i < (BufferSize >> 3); i++) {
    *Buffer64 = i | (~i << 32);
    Buffer64++;
  }
}

BOOLEAN
CompareBuffer (
  VOID  *BufferA,
  VOID  *BufferB,
  UINTN BufferSize
  )
{
  UINTN i;
  UINT64* BufferA64 = (UINT64*)BufferA;
  UINT64* BufferB64 = (UINT64*)BufferB;

  for (i = 0; i < (BufferSize >> 3); i++) {
    if (*BufferA64 != *BufferB64) {
      DEBUG ((EFI_D_ERROR, "CompareBuffer: Error at %i", i));
      DEBUG ((EFI_D_ERROR, "(0x%lX) != (0x%lX)\n", *BufferA64, *BufferB64));
      return FALSE;
    }
    BufferA64++;
    BufferB64++;
  }
  return TRUE;
}

EFI_STATUS
MmcReadWriteDataTest (
  MMC_HOST_INSTANCE *MmcHostInstance,
  EFI_LBA           Lba,
  UINTN             BufferSize
  )
{
  VOID                        *BackBuffer;
  VOID                        *WriteBuffer;
  VOID                        *ReadBuffer;
  EFI_STATUS                  Status;

  // Check if a Media is Present
  if (!MmcHostInstance->BlockIo.Media->MediaPresent) {
    DiagnosticLog (L"ERROR: No Media Present\n");
    return EFI_NO_MEDIA;
  }

  if (MmcHostInstance->State != MmcTransferState) {
    DiagnosticLog (L"ERROR: Not ready for Transfer state\n");
    return EFI_NOT_READY;
  }

  BackBuffer = AllocatePool (BufferSize);
  WriteBuffer = AllocatePool (BufferSize);
  ReadBuffer = AllocatePool (BufferSize);

  // Read (and save) buffer at a specific location
  Status = MmcReadBlocks (&(MmcHostInstance->BlockIo), MmcHostInstance->BlockIo.Media->MediaId,Lba,BufferSize,BackBuffer);
  if (Status != EFI_SUCCESS) {
    DiagnosticLog (L"ERROR: Fail to Read Block (1)\n");
    return Status;
  }

  // Write buffer at the same location
  GenerateRandomBuffer (WriteBuffer,BufferSize);
  Status = MmcWriteBlocks (&(MmcHostInstance->BlockIo), MmcHostInstance->BlockIo.Media->MediaId,Lba,BufferSize,WriteBuffer);
  if (Status != EFI_SUCCESS) {
    DiagnosticLog (L"ERROR: Fail to Write Block (1)\n");
    return Status;
  }

  // Read the buffer at the same location
  Status = MmcReadBlocks (&(MmcHostInstance->BlockIo), MmcHostInstance->BlockIo.Media->MediaId,Lba,BufferSize,ReadBuffer);
  if (Status != EFI_SUCCESS) {
    DiagnosticLog (L"ERROR: Fail to Read Block (2)\n");
    return Status;
  }

  // Check that is conform
  if (!CompareBuffer (ReadBuffer,WriteBuffer,BufferSize)) {
    DiagnosticLog (L"ERROR: Fail to Read/Write Block (1)\n");
    return EFI_INVALID_PARAMETER;
  }

  // Restore content at the original location
  Status = MmcWriteBlocks (&(MmcHostInstance->BlockIo), MmcHostInstance->BlockIo.Media->MediaId,Lba,BufferSize,BackBuffer);
  if (Status != EFI_SUCCESS) {
    DiagnosticLog (L"ERROR: Fail to Write Block (2)\n");
    return Status;
  }

  // Read the restored content
  Status = MmcReadBlocks (&(MmcHostInstance->BlockIo), MmcHostInstance->BlockIo.Media->MediaId,Lba,BufferSize,ReadBuffer);
  if (Status != EFI_SUCCESS) {
    DiagnosticLog (L"ERROR: Fail to Read Block (3)\n");
    return Status;
  }

  // Check the content is correct
  if (!CompareBuffer (ReadBuffer,BackBuffer,BufferSize)) {
    DiagnosticLog (L"ERROR: Fail to Read/Write Block (2)\n");
    return EFI_INVALID_PARAMETER;
  }

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
MmcDriverDiagnosticsRunDiagnostics (
  IN  EFI_DRIVER_DIAGNOSTICS_PROTOCOL               *This,
  IN  EFI_HANDLE                                    ControllerHandle,
  IN  EFI_HANDLE                                    ChildHandle  OPTIONAL,
  IN  EFI_DRIVER_DIAGNOSTIC_TYPE                    DiagnosticType,
  IN  CHAR8                                         *Language,
  OUT EFI_GUID                                      **ErrorType,
  OUT UINTN                                         *BufferSize,
  OUT CHAR16                                        **Buffer
  )
{
  LIST_ENTRY              *CurrentLink;
  MMC_HOST_INSTANCE       *MmcHostInstance;
  EFI_STATUS              Status;

  if ((Language         == NULL) ||
      (ErrorType        == NULL) ||
      (Buffer           == NULL) ||
      (ControllerHandle == NULL) ||
      (BufferSize       == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  // Check Language is supported (i.e. is "en-*" - only English is supported)
  if (AsciiStrnCmp (Language, "en", 2) != 0) {
    return EFI_UNSUPPORTED;
  }

  Status = EFI_SUCCESS;
  *ErrorType  = NULL;
  *BufferSize = DIAGNOSTIC_LOGBUFFER_MAXCHAR;
  *Buffer = DiagnosticInitLog (DIAGNOSTIC_LOGBUFFER_MAXCHAR);

  DiagnosticLog (L"MMC Driver Diagnostics\n");

  // Find the MMC Host instance on which we have been asked to run diagnostics
  MmcHostInstance = NULL;
  CurrentLink = mMmcHostPool.ForwardLink;
  while (CurrentLink != NULL && CurrentLink != &mMmcHostPool && (Status == EFI_SUCCESS)) {
    MmcHostInstance = MMC_HOST_INSTANCE_FROM_LINK(CurrentLink);
    ASSERT(MmcHostInstance != NULL);
    if (MmcHostInstance->MmcHandle == ControllerHandle) {
      break;
    }
    CurrentLink = CurrentLink->ForwardLink;
  }

  // If we didn't find the controller, return EFI_UNSUPPORTED
  if ((MmcHostInstance == NULL)
      || (MmcHostInstance->MmcHandle != ControllerHandle)) {
    return EFI_UNSUPPORTED;
  }

  // LBA=1 Size=BlockSize
  DiagnosticLog (L"MMC Driver Diagnostics - Test: First Block\n");
  Status = MmcReadWriteDataTest (MmcHostInstance, 1, MmcHostInstance->BlockIo.Media->BlockSize);

  // LBA=2 Size=BlockSize
  DiagnosticLog (L"MMC Driver Diagnostics - Test: Second Block\n");
  Status = MmcReadWriteDataTest (MmcHostInstance, 2, MmcHostInstance->BlockIo.Media->BlockSize);

  // LBA=10 Size=BlockSize
  DiagnosticLog (L"MMC Driver Diagnostics - Test: Any Block\n");
  Status = MmcReadWriteDataTest (MmcHostInstance, MmcHostInstance->BlockIo.Media->LastBlock >> 1, MmcHostInstance->BlockIo.Media->BlockSize);

  // LBA=LastBlock Size=BlockSize
  DiagnosticLog (L"MMC Driver Diagnostics - Test: Last Block\n");
  Status = MmcReadWriteDataTest (MmcHostInstance, MmcHostInstance->BlockIo.Media->LastBlock, MmcHostInstance->BlockIo.Media->BlockSize);

  // LBA=1 Size=2*BlockSize
  DiagnosticLog (L"MMC Driver Diagnostics - Test: First Block / 2 BlockSSize\n");
  Status = MmcReadWriteDataTest (MmcHostInstance, 1, 2 * MmcHostInstance->BlockIo.Media->BlockSize);

  return Status;
}

//
// EFI Driver Diagnostics 2 Protocol
//
GLOBAL_REMOVE_IF_UNREFERENCED EFI_DRIVER_DIAGNOSTICS2_PROTOCOL gMmcDriverDiagnostics2 = {
  (EFI_DRIVER_DIAGNOSTICS2_RUN_DIAGNOSTICS) MmcDriverDiagnosticsRunDiagnostics,
  "en"
};