EmbeddedPkg: Move Universal/MmcDxe from ArmPkg to EmbeddedPkg

The MmcDxe is not ARM architecture specific.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11725 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 614 insertions, 0 deletions

diff --git a/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c b/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
new file mode 100644
index 0000000000..f7cdb6d6d9
--- /dev/null
+++ b/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
@@ -0,0 +1,614 @@
+/** @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/MmcHost.h>

+#include <Library/DebugLib.h>

+#include <Library/BaseMemoryLib.h>

+#include <Library/TimerLib.h>

+

+#include "Mmc.h"

+

+// Untested ...

+//#define USE_STREAM

+

+#define MAX_RETRY_COUNT  1000

+#define CMD_RETRY_COUNT  20

+

+EFI_STATUS

+MmcNotifyState (

+  MMC_HOST_INSTANCE *MmcHostInstance,

+  MMC_STATE State

+  ) {

+    MmcHostInstance->State = State;

+    return MmcHostInstance->MmcHost->NotifyState(State);

+}

+

+VOID PrintOCR(UINT32 ocr) {

+    UINTN minv, maxv, volts;

+    UINTN loop;

+

+    minv  = 36;  // 3.6

+    maxv  = 20;  // 2.0

+    volts = 20;  // 2.0

+

+    // The MMC register bits [23:8] indicate the working range of the card

+    for (loop = 8; loop < 24; loop++) {

+        if (ocr & (1 << loop)) {

+            if (minv > volts) minv = volts;

+            if (maxv < volts) maxv = volts + 1;

+        }

+        volts = volts + 1;

+    }

+

+    DEBUG((EFI_D_ERROR, "- PrintOCR ocr (0x%X)\n",ocr));

+    DEBUG((EFI_D_ERROR, "\t- Card operating voltage: %d.%d to %d.%d\n", minv/10, minv % 10, maxv/10, maxv % 10));

+    if (((ocr >> 29) & 3) == 0)

+        DEBUG((EFI_D_ERROR, "\t- AccessMode: Byte Mode\n"));

+    else

+        DEBUG((EFI_D_ERROR, "\t- AccessMode: Block Mode (0x%X)\n",((ocr >> 29) & 3)));

+

+    if (ocr & MMC_OCR_POWERUP)

+        DEBUG((EFI_D_ERROR, "\t- PowerUp\n"));

+    else

+        DEBUG((EFI_D_ERROR, "\t- Voltage Not Supported\n"));

+}

+

+VOID PrintCID(UINT32* cid) {

+    DEBUG((EFI_D_ERROR, "- PrintCID\n"));

+    DEBUG((EFI_D_ERROR, "\t- Manufacturing date: %d/%d\n",(cid[0] >> 8) & 0xF,(cid[0] >> 12) & 0xFF));

+    DEBUG((EFI_D_ERROR, "\t- Product serial number: 0x%X%X\n",cid[1] & 0xFFFFFF,(cid[0] >> 24) & 0xFF));

+    DEBUG((EFI_D_ERROR, "\t- Product revision: %d\n",cid[1] >> 24));

+    //DEBUG((EFI_D_ERROR, "\t- Product name: %s\n",(char*)(cid + 2)));

+    DEBUG((EFI_D_ERROR, "\t- OEM ID: %c%c\n",(cid[3] >> 8) & 0xFF,(cid[3] >> 16) & 0xFF));

+}

+

+VOID PrintCSD(UINT32* csd) {

+    UINTN val32;

+    CONST CHAR8* str_unit[] = { "100kbit/s","1Mbit/s","10Mbit/s","100MBit/s","Unkbown","Unkbown","Unkbown","Unkbown" };

+    CONST CHAR8* str_value[] = { "1.0","1.2","1.3","1.5","2.0","2.5","3.0","3.5","4.0","4.5","5.0","Unknown","Unknown","Unknown","Unknown" };

+

+    if (((csd[2] >> 30) & 0x3) == 0)

+        DEBUG((EFI_D_ERROR, "- PrintCSD Version 1.01-1.10/Version 2.00/Standard Capacity\n"));

+    else if (((csd[2] >> 30) & 0x3) == 1)

+        DEBUG((EFI_D_ERROR, "- PrintCSD Version 2.00/High Capacity\n"));

+    else

+        DEBUG((EFI_D_ERROR, "- PrintCSD Version Higher than v3.3\n"));

+

+    DEBUG((EFI_D_ERROR, "\t- Supported card command class: 0x%X\n",MMC_CSD_GET_CCC(csd)));

+    DEBUG((EFI_D_ERROR, "\t- Speed: %a %a\n",str_value[(MMC_CSD_GET_TRANSPEED(csd) >> 3) & 0xF],str_unit[MMC_CSD_GET_TRANSPEED(csd) & 7]));

+    DEBUG((EFI_D_ERROR, "\t- Maximum Read Data Block: %d\n",2 << (MMC_CSD_GET_READBLLEN(csd)-1)));

+    DEBUG((EFI_D_ERROR, "\t- Maximum Write Data Block: %d\n",2 << (MMC_CSD_GET_WRITEBLLEN(csd)-1)));

+    

+    if (!MMC_CSD_GET_FILEFORMATGRP(csd)) {

+        val32 = MMC_CSD_GET_FILEFORMAT(csd);

+        if (val32 == 0)         DEBUG((EFI_D_ERROR, "\t- Format(0): Hard disk-like file system with partition table\n"));

+        else if (val32 == 1)    DEBUG((EFI_D_ERROR, "\t- Format(1): DOS FAT (floppy-like) with boot sector only (no partition table)\n"));

+        else if (val32 == 2)    DEBUG((EFI_D_ERROR, "\t- Format(2): Universal File Format\n"));

+        else                    DEBUG((EFI_D_ERROR, "\t- Format(3): Others/Unknown\n"));

+    } else {

+        DEBUG((EFI_D_ERROR, "\t- Format: Reserved\n"));

+    }

+}

+

+VOID PrintRCA(UINT32 rca) {

+    DEBUG((EFI_D_ERROR, "- PrintRCA: 0x%X\n",rca));

+    DEBUG((EFI_D_ERROR, "\t- Status: 0x%X\n",rca & 0xFFFF));

+    DEBUG((EFI_D_ERROR, "\t- RCA: 0x%X\n",(rca >> 16) & 0xFFFF));

+}

+

+VOID PrintResponseR1(UINT32 response) {

+    DEBUG((EFI_D_INFO, "Response: 0x%X\n",response));

+    if (response & (1 << 8))                 DEBUG((EFI_D_INFO, "\t- READY_FOR_DATA\n"));

+

+    if (((response >> 9) & 0xF) == 0)         DEBUG((EFI_D_INFO, "\t- State: Idle\n"));

+    else if (((response >> 9) & 0xF) == 1)    DEBUG((EFI_D_INFO, "\t- State: Ready\n"));

+    else if (((response >> 9) & 0xF) == 2)    DEBUG((EFI_D_INFO, "\t- State: Ident\n"));

+    else if (((response >> 9) & 0xF) == 3)    DEBUG((EFI_D_INFO, "\t- State: StandBy\n"));

+    else if (((response >> 9) & 0xF) == 4)    DEBUG((EFI_D_INFO, "\t- State: Tran\n"));

+    else if (((response >> 9) & 0xF) == 5)    DEBUG((EFI_D_INFO, "\t- State: Data\n"));

+    else if (((response >> 9) & 0xF) == 6)    DEBUG((EFI_D_INFO, "\t- State: Rcv\n"));

+    else if (((response >> 9) & 0xF) == 7)    DEBUG((EFI_D_INFO, "\t- State: Prg\n"));

+    else if (((response >> 9) & 0xF) == 8)    DEBUG((EFI_D_INFO, "\t- State: Dis\n"));

+    else                                     DEBUG((EFI_D_INFO, "\t- State: Reserved\n"));

+}

+

+EFI_STATUS

+EFIAPI

+MmcGetCardStatus(

+		MMC_HOST_INSTANCE     *MmcHostInstance

+  ){

+    EFI_STATUS              Status=EFI_SUCCESS;

+    UINT32                  Response[4];

+    UINTN                   CmdArg;

+    EFI_MMC_HOST_PROTOCOL   *MmcHost;

+

+    MmcHost = MmcHostInstance->MmcHost;

+    CmdArg = 0;

+

+    if (MmcHost == NULL) {

+        return EFI_INVALID_PARAMETER;

+    }

+    if(MmcHostInstance->State != MmcHwInitializationState){

+    	//Get the Status of the card.

+    	CmdArg = MmcHostInstance->CardInfo.RCA << 16;

+    	Status = MmcHost->SendCommand(MMC_CMD13, CmdArg);

+    	if (EFI_ERROR(Status)) {

+    		DEBUG((EFI_D_ERROR, "MmcGetCardStatus(MMC_CMD13): Error and Status = %r\n", Status));

+    		ASSERT(0);

+    		return Status;

+    	}

+

+    	//Read Response

+    	MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_R1,Response);

+    	PrintResponseR1(Response[0]);

+    }

+

+	return Status;

+}

+

+EFI_STATUS

+EFIAPI

+MmcIdentificationMode (

+  MMC_HOST_INSTANCE     *MmcHostInstance

+  ) {

+    EFI_STATUS              Status;

+    UINT32                  Response[4];

+    UINTN                   Timeout;

+    UINTN                   CmdArg;

+    BOOLEAN                 bHCS;

+    EFI_MMC_HOST_PROTOCOL   *MmcHost;

+    UINTN                   CmdRetryCnt;

+    

+    MmcHost = MmcHostInstance->MmcHost;

+    CmdArg = 0;

+    bHCS = FALSE;

+

+    if (MmcHost == NULL) {

+        return EFI_INVALID_PARAMETER;

+    }

+

+    // We can get into this function if we restart the identification mode

+    if (MmcHostInstance->State == MmcHwInitializationState) {

+        // Initialize the MMC Host HW

+        Status = MmcNotifyState (MmcHostInstance, MmcHwInitializationState);

+        if (EFI_ERROR(Status)) {

+            DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : Error MmcHwInitializationState\n"));

+            return Status;

+        }

+    } else {

+        //Note: Could even be used in all cases. But it looks this command could put the state machine into inactive for some cards

+        Status = MmcHost->SendCommand(MMC_CMD0, 0);

+        if (EFI_ERROR(Status)) {

+            DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD0): Error\n"));

+            return Status;

+        }

+    }

+

+    Status = MmcNotifyState (MmcHostInstance, MmcIdleState);

+    if (EFI_ERROR(Status)) {

+        DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : Error MmcIdleState\n"));

+        return Status;

+    }

+

+    // Are we using SDIO ?

+    Status = MmcHost->SendCommand(MMC_CMD5, 0);

+    if (Status == EFI_SUCCESS) {

+        DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD5): Error - SDIO not supported.\n"));

+        return EFI_UNSUPPORTED;

+    }

+

+    // Check which kind of card we are using. Ver2.00 or later SD Memory Card (PL180 is SD v1.1)

+    CmdArg = (0x0UL << 12 | BIT8 | 0xCEUL << 0);

+    Status = MmcHost->SendCommand(MMC_CMD8, CmdArg);

+    if (Status == EFI_SUCCESS) {

+        DEBUG ((EFI_D_ERROR, "Card is SD2.0 => Supports high capacity\n"));

+        bHCS = TRUE;

+        MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_R7,Response);

+        PrintResponseR1(Response[0]);

+        //check if it is valid response

+        if(Response[0] != CmdArg){

+        	DEBUG ((EFI_D_ERROR, "The Card is not usable\n"));

+        	return EFI_UNSUPPORTED;

+        }

+    } else {

+        DEBUG ((EFI_D_ERROR, "Not a SD2.0 Card\n"));

+    }

+

+    // We need to wait for the MMC or SD card is ready => (gCardInfo.OCRData.Busy == 1)

+    Timeout = MAX_RETRY_COUNT;

+    while (Timeout > 0) {

+        // SD Card or MMC Card ? CMD55 indicates to the card that the next command is an application specific command

+        Status = MmcHost->SendCommand(MMC_CMD55, 0);

+        if (Status == EFI_SUCCESS) {

+            DEBUG ((EFI_D_INFO, "Card should be SD\n"));

+            if (bHCS) {

+                MmcHostInstance->CardInfo.CardType = SD_CARD_2;

+            } else {

+                MmcHostInstance->CardInfo.CardType = SD_CARD;

+            }

+

+            // Note: The first time CmdArg will be zero

+            CmdArg = ((UINTN *) &(MmcHostInstance->CardInfo.OCRData))[0];

+            if (bHCS) {

+                CmdArg |= BIT30;

+            }

+            Status = MmcHost->SendCommand(MMC_ACMD41, CmdArg);

+            if (!EFI_ERROR(Status)) {

+              MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_OCR,Response);

+              ((UINT32 *) &(MmcHostInstance->CardInfo.OCRData))[0] = Response[0];

+            }

+        } else {

+            DEBUG ((EFI_D_INFO, "Card should be MMC\n"));

+            MmcHostInstance->CardInfo.CardType = MMC_CARD;

+

+            Status = MmcHost->SendCommand(MMC_CMD1, 0x800000);

+            if (!EFI_ERROR(Status)) {

+              MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_OCR,Response);

+              ((UINT32 *) &(MmcHostInstance->CardInfo.OCRData))[0] = Response[0];

+            }

+        }

+

+        if (!EFI_ERROR(Status)) {

+          if (MmcHostInstance->CardInfo.OCRData.Busy == 0) {

+              MicroSecondDelay(1);

+              Timeout--;

+          } else {

+              if ((MmcHostInstance->CardInfo.CardType == SD_CARD_2) && (MmcHostInstance->CardInfo.OCRData.AccessMode & BIT1)) {

+                  MmcHostInstance->CardInfo.CardType = SD_CARD_2_HIGH;

+                  DEBUG ((EFI_D_ERROR, "High capacity card.\n"));

+              }

+              break;  // The MMC/SD card is ready. Continue the Identification Mode

+          }

+        } else {

+          MicroSecondDelay(1);

+          Timeout--;

+        }

+    }

+

+    if (Timeout == 0) {

+        DEBUG((EFI_D_ERROR, "MmcIdentificationMode(): No Card\n"));

+        ASSERT(0);

+        return EFI_NO_MEDIA;

+    } else {

+        PrintOCR(Response[0]);

+    }

+

+    Status = MmcNotifyState (MmcHostInstance, MmcReadyState);

+    if (EFI_ERROR(Status)) {

+        DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : Error MmcReadyState\n"));

+        return Status;

+    }

+

+    Status = MmcHost->SendCommand(MMC_CMD2, 0);

+    if (EFI_ERROR(Status)) {

+        DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD2): Error\n"));

+        ASSERT(0);

+        return Status;

+    }

+    MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_CID,Response);

+    PrintCID(Response);

+

+    Status = MmcNotifyState (MmcHostInstance, MmcIdentificationState);

+    if (EFI_ERROR(Status)) {

+        DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : Error MmcIdentificationState\n"));

+        return Status;

+    }

+

+    CmdArg = 0;

+    CmdRetryCnt = CMD_RETRY_COUNT;

+    //Keep sending CMD 3 until card enters to Standby mode and Card status is ready

+    while((MMC_R0_CURRENTSTATE(Response) != MMC_R0_STATE_STDBY) && CmdRetryCnt-- ){

+        Status = MmcHost->SendCommand(MMC_CMD3, CmdArg);

+        if (EFI_ERROR(Status)) {

+            DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD3): Error\n"));

+            return Status;

+        }

+        MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_RCA,Response);

+        PrintRCA(Response[0]);

+    }

+

+    // For MMC card, RCA is assigned by CMD3 while CMD3 dumps the RCA for SD card

+    if (MmcHostInstance->CardInfo.CardType != MMC_CARD) {

+        MmcHostInstance->CardInfo.RCA = Response[0] >> 16;

+    } else {

+        MmcHostInstance->CardInfo.RCA = CmdArg;

+    }

+

+    Status = MmcNotifyState (MmcHostInstance, MmcStandByState);

+    if (EFI_ERROR(Status)) {

+        DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : Error MmcStandByState\n"));

+        return Status;

+    }

+

+    return EFI_SUCCESS;

+}

+

+EFI_STATUS

+EFIAPI

+MmcReset (

+  IN EFI_BLOCK_IO_PROTOCOL    *This,

+  IN BOOLEAN                  ExtendedVerification

+  ) {

+    // Implement me. Either send a CMD0 (could not work for some MMC host) or just turn off/turn

+    //      on power and restart Identification mode

+    return EFI_SUCCESS;

+}

+

+EFI_STATUS

+MmcDetectCard (

+  EFI_MMC_HOST_PROTOCOL     *MmcHost

+  )

+{

+    if (!MmcHost->IsCardPresent()) {

+        return EFI_NO_MEDIA;

+    } else {

+        return EFI_SUCCESS;

+    }

+}

+

+#define MMCI0_BLOCKLEN 512

+#define MMCI0_TIMEOUT  10000

+

+EFI_STATUS MmcIoBlocks (

+  IN EFI_BLOCK_IO_PROTOCOL    *This,

+  IN UINTN                    Transfer,

+  IN UINT32                   MediaId,

+  IN EFI_LBA                  Lba,

+  IN UINTN                    BufferSize,

+  OUT VOID                    *Buffer

+  ) {

+    UINT32                  Response[4];

+    EFI_STATUS              Status;

+    UINTN                   CardSize, NumBlocks, BlockSize, CmdArg;

+    UINTN                   Timeout;

+    UINTN                   Cmd;

+    MMC_HOST_INSTANCE       *MmcHostInstance;

+    EFI_MMC_HOST_PROTOCOL   *MmcHost;

+    UINTN                   BytesRemainingToBeTransfered;

+    UINTN                   BlockCount = 1;

+

+    MmcHostInstance = MMC_HOST_INSTANCE_FROM_BLOCK_IO_THIS(This);

+    ASSERT(MmcHostInstance != 0);

+    MmcHost = MmcHostInstance->MmcHost;

+    ASSERT(MmcHost);

+

+    if (MmcHost == 0) {

+        return EFI_INVALID_PARAMETER;

+    }

+

+    // Check if a Card is Present

+    if (!MmcHost->IsCardPresent()) {

+        MmcHostInstance->BlockIo.Media->MediaPresent = FALSE;

+        MmcHostInstance->BlockIo.Media->LastBlock    = 0;

+        MmcHostInstance->BlockIo.Media->BlockSize    = 512;  // Should be zero but there is a bug in DiskIo

+        MmcHostInstance->BlockIo.Media->ReadOnly     = FALSE; 

+        return EFI_NO_MEDIA;

+    }

+

+    // If the driver has not been initialized yet then go into Iddentification Mode

+    if (MmcHostInstance->State == MmcHwInitializationState) {

+        MmcIdentificationMode (MmcHostInstance);

+

+        //Send a command to get Card specific data

+        CmdArg = MmcHostInstance->CardInfo.RCA << 16;

+        Status = MmcHost->SendCommand(MMC_CMD9, CmdArg);

+        if (EFI_ERROR(Status)) {

+            DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD9): Error, Status=%r\n", Status));

+            ASSERT(0);

+            return Status;

+        }

+        //Read Response

+        MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_CSD,Response);

+        PrintCSD(Response);

+

+        if (MmcHostInstance->CardInfo.CardType == SD_CARD_2_HIGH) {

+            ASSERT(0);  //TODO: Implementation needed

+            CardSize = MMC_CSD_GET_DEVICESIZE(Response);

+            NumBlocks = ((CardSize + 1) * 1024);;

+            BlockSize = 1 << MMC_CSD_GET_READBLLEN(Response);

+        } else {

+            CardSize = MMC_CSD_GET_DEVICESIZE(Response);

+            NumBlocks = (CardSize + 1) * (1 << (MMC_CSD_GET_DEVICESIZEMULT(Response) + 2));

+            BlockSize = 1 << MMC_CSD_GET_READBLLEN(Response);

+        }

+

+        //For >=2G card, BlockSize may be 1K, but the transfer size is 512 bytes.

+        if (BlockSize > 512) {

+            NumBlocks = MultU64x32(NumBlocks, BlockSize/512);

+            BlockSize = 512;        

+        }

+

+        MmcHostInstance->BlockIo.Media->LastBlock    = (NumBlocks - 1);

+        MmcHostInstance->BlockIo.Media->BlockSize    = BlockSize;

+        MmcHostInstance->BlockIo.Media->ReadOnly     = MmcHost->IsReadOnly();

+        MmcHostInstance->BlockIo.Media->MediaPresent = TRUE; 

+        MmcHostInstance->BlockIo.Media->MediaId++; 

+

+        CmdArg = MmcHostInstance->CardInfo.RCA << 16;

+        Status = MmcHost->SendCommand(MMC_CMD7, CmdArg);

+        if (EFI_ERROR(Status)) {

+            DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD7): Error and Status = %r\n", Status));

+            ASSERT(0);

+            return Status;

+        }

+

+        Status = MmcNotifyState (MmcHostInstance, MmcTransferState);

+        if (EFI_ERROR(Status)) {

+            DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : Error MmcTransferState\n"));

+            return Status;

+        }

+    } else {

+        // Maybe test if the card has changed to update gMmcMedia information

+        if (MmcHostInstance->State == MmcTransferState) {

+            //DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : MmcTransferState\n"));

+        } else if (MmcHostInstance->State == MmcStandByState) {

+            DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : MmcStandByState\n"));

+        } else {

+            ASSERT(0);

+        }

+    }

+

+    if (Lba > This->Media->LastBlock) {

+        ASSERT(0);

+        return EFI_INVALID_PARAMETER;

+    }

+  

+    if ((BufferSize % This->Media->BlockSize) != 0) {

+        ASSERT(0);

+        return EFI_BAD_BUFFER_SIZE;

+    }

+

+    BytesRemainingToBeTransfered = BufferSize;

+    while (BytesRemainingToBeTransfered > 0) {

+

+    	//Check if the Card is in Ready status

+		CmdArg = MmcHostInstance->CardInfo.RCA << 16;

+		Response[0] = 0;

+		Timeout = 20;

+    	while((Response[0] & (1 << 8)) && Timeout-- ){

+    		Status = MmcHost->SendCommand(MMC_CMD13, CmdArg);

+    		if (!EFI_ERROR(Status)){

+    			MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_R1,Response);

+    		}

+    	}

+

+        // Set Block Length

+        Status = MmcHost->SendCommand(MMC_CMD16, This->Media->BlockSize);

+        if (EFI_ERROR(Status)) {

+        	DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD16): Error This->Media->BlockSize:%d and Error = %r\n",This->Media->BlockSize, Status));

+            return Status;

+        }

+

+        // Block Count (not used). Could return an error for SD card

+        MmcHost->SendCommand(MMC_CMD23, BlockCount);

+

+        //Set command argument based on the card access mode (Byte mode or Block mode)

+        if (MmcHostInstance->CardInfo.OCRData.AccessMode & BIT1) {

+            CmdArg = Lba;

+        } else {

+            CmdArg = Lba * This->Media->BlockSize;

+        }

+

+        if (Transfer == MMC_IOBLOCKS_READ) {

+#ifndef USE_STREAM

+            // Read a single block

+            Cmd = MMC_CMD17;

+#else

+            //TODO: Should we support read stream (MMC_CMD11)

+#endif

+        } else {

+#ifndef USE_STREAM

+            // Write a single block

+            Cmd = MMC_CMD24;

+#else

+            //TODO: Should we support write stream (MMC_CMD20)

+#endif

+        }

+        Status = MmcHost->SendCommand(Cmd, CmdArg);

+        if (EFI_ERROR(Status)) {

+            DEBUG((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD%d): Error %r\n",Cmd, Status));

+            return Status;

+        }

+

+        if (Transfer == MMC_IOBLOCKS_READ) {

+#ifndef USE_STREAM

+            // Read one block of Data

+            Status = MmcHost->ReadBlockData(Lba,This->Media->BlockSize,Buffer);

+            if (EFI_ERROR(Status)) {

+                DEBUG((EFI_D_BLKIO, "MmcIdentificationMode(): Error Read Block Data and Status = %r\n", Status));

+                return Status;

+            }

+#else

+            //TODO: Read a steam

+            ASSERT(0);

+#endif

+            Status = MmcNotifyState (MmcHostInstance, MmcProgrammingState);

+            if (EFI_ERROR(Status)) {

+                DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : Error MmcProgrammingState\n"));

+                return Status;

+            }

+        } else {

+#ifndef USE_STREAM

+            // Write one block of Data

+            Status = MmcHost->WriteBlockData(Lba,This->Media->BlockSize,Buffer);

+            if (EFI_ERROR(Status)) {

+                DEBUG((EFI_D_BLKIO, "MmcIdentificationMode(): Error Write Block Data and Status = %r\n", Status));

+                return Status;

+            }

+#else

+            //TODO: Write a steam

+            ASSERT(0);

+#endif

+        }

+

+        // Command 12 - Stop transmission (ends read)

+        Status = MmcHost->SendCommand(MMC_CMD12, 0);

+        MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_R1b,Response);

+

+        // Command 13 - Read status and wait for programming to complete (return to tran)

+        Timeout = MMCI0_TIMEOUT;

+        CmdArg = MmcHostInstance->CardInfo.RCA << 16;

+        while ((MMC_R0_CURRENTSTATE(Response) != MMC_R0_STATE_TRAN) && Timeout) {

+            MmcHost->SendCommand(MMC_CMD13, CmdArg);

+            MmcHost->ReceiveResponse(MMC_RESPONSE_TYPE_R1,Response);

+            NanoSecondDelay(100);

+            Timeout--;

+        }

+

+        Status = MmcNotifyState (MmcHostInstance, MmcTransferState);

+        if (EFI_ERROR(Status)) {

+            DEBUG((EFI_D_ERROR, "MmcIdentificationMode() : Error MmcTransferState\n"));

+            return Status;

+        }

+

+        BytesRemainingToBeTransfered -= This->Media->BlockSize;

+        Lba    += BlockCount;

+        Buffer = (UINT8 *)Buffer + This->Media->BlockSize;

+    }

+

+    return EFI_SUCCESS;

+}

+

+EFI_STATUS

+EFIAPI

+MmcReadBlocks (

+  IN EFI_BLOCK_IO_PROTOCOL    *This,

+  IN UINT32                   MediaId,

+  IN EFI_LBA                  Lba,

+  IN UINTN                    BufferSize,

+  OUT VOID                    *Buffer

+  ) {

+    return MmcIoBlocks (This, MMC_IOBLOCKS_READ, MediaId, Lba, BufferSize, Buffer);

+}

+

+EFI_STATUS

+EFIAPI

+MmcWriteBlocks (

+  IN EFI_BLOCK_IO_PROTOCOL    *This,

+  IN UINT32                   MediaId,

+  IN EFI_LBA                  Lba,

+  IN UINTN                    BufferSize,

+  IN VOID                     *Buffer

+  ) {

+    return MmcIoBlocks (This, MMC_IOBLOCKS_WRITE, MediaId, Lba, BufferSize, Buffer);

+}

+

+EFI_STATUS

+EFIAPI

+MmcFlushBlocks (

+  IN EFI_BLOCK_IO_PROTOCOL  *This

+  ) {

+    return EFI_SUCCESS;

+}

+