--- /dev/null
+/** @file
+
+ Copyright (c) 2008-2009, Apple Inc. All rights reserved.
+
+ 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 "Flash.h"
+
+NAND_PART_INFO_TABLE gNandPartInfoTable[1] = {
+ { 0x2C, 0xBA, 17, 11 }
+};
+
+NAND_FLASH_INFO *gNandFlashInfo = NULL;
+UINT8 *gEccCode;
+UINTN gNum512BytesChunks = 0;
+
+//\r
+// Device path for SemiHosting. It contains our autogened Caller ID GUID.\r
+//\r
+typedef struct {\r
+ VENDOR_DEVICE_PATH Guid;\r
+ EFI_DEVICE_PATH_PROTOCOL End;\r
+} FLASH_DEVICE_PATH;\r
+\r
+FLASH_DEVICE_PATH gDevicePath = {\r
+ {\r
+ { HARDWARE_DEVICE_PATH, HW_VENDOR_DP, sizeof (VENDOR_DEVICE_PATH), 0 },\r
+ EFI_CALLER_ID_GUID\r
+ },\r
+ { END_DEVICE_PATH_TYPE, END_ENTIRE_DEVICE_PATH_SUBTYPE, sizeof (EFI_DEVICE_PATH_PROTOCOL), 0}\r
+};\r
+
+
+//Actual page address = Column address + Page address + Block address.
+UINTN
+GetActualPageAddressInBytes (
+ UINTN BlockIndex,
+ UINTN PageIndex
+)
+{
+ //BlockAddressStart = Start of the Block address in actual NAND
+ //PageAddressStart = Start of the Page address in actual NAND
+ return ((BlockIndex << gNandFlashInfo->BlockAddressStart) + (PageIndex << gNandFlashInfo->PageAddressStart));
+}
+
+VOID
+NandSendCommand (
+ UINT8 Command
+)
+{
+ MmioWrite16(GPMC_NAND_COMMAND_0, Command);
+}
+
+VOID
+NandSendAddress (
+ UINT8 Address
+)
+{
+ MmioWrite16(GPMC_NAND_ADDRESS_0, Address);
+}
+
+UINT16
+NandReadStatus (
+ VOID
+ )
+{
+ //Send READ STATUS command
+ NandSendCommand(READ_STATUS_CMD);
+
+ //Read status.
+ return MmioRead16(GPMC_NAND_DATA_0);
+}
+
+VOID
+NandSendAddressCycles (
+ UINTN Address
+)
+{
+ //Column address
+ NandSendAddress(Address & 0xff);
+ Address >>= 8;
+
+ //Column address
+ NandSendAddress(Address & 0x07);
+ Address >>= 3;
+
+ //Page and Block address
+ NandSendAddress(Address & 0xff);
+ Address >>= 8;
+
+ //Block address
+ NandSendAddress(Address & 0xff);
+ Address >>= 8;
+
+ //Block address
+ NandSendAddress(Address & 0x01);
+}
+
+VOID
+GpmcInit (
+ VOID
+ )
+{
+ //Enable Smart-idle mode.
+ MmioWrite32(GPMC_SYSCONFIG, SMARTIDLEMODE);
+
+ //Set IRQSTATUS and IRQENABLE to the reset value
+ MmioWrite32(GPMC_IRQSTATUS, 0x0);
+ MmioWrite32(GPMC_IRQENABLE, 0x0);
+
+ //Disable GPMC timeout control.
+ MmioWrite32(GPMC_TIMEOUT_CONTROL, TIMEOUTDISABLE);
+
+ //Set WRITEPROTECT bit to enable write access.
+ MmioWrite32(GPMC_CONFIG, WRITEPROTECT_HIGH);
+
+ //NOTE: Following GPMC_CONFIGi_0 register settings are taken from u-boot memory dump.
+ MmioWrite32(GPMC_CONFIG1_0, DEVICETYPE_NAND | DEVICESIZE_X16);
+ MmioWrite32(GPMC_CONFIG2_0, CSRDOFFTIME | CSWROFFTIME);
+ MmioWrite32(GPMC_CONFIG3_0, ADVRDOFFTIME | ADVWROFFTIME);
+ MmioWrite32(GPMC_CONFIG4_0, OEONTIME | OEOFFTIME | WEONTIME | WEOFFTIME);
+ MmioWrite32(GPMC_CONFIG5_0, RDCYCLETIME | WRCYCLETIME | RDACCESSTIME | PAGEBURSTACCESSTIME);
+ MmioWrite32(GPMC_CONFIG6_0, WRACCESSTIME | WRDATAONADMUXBUS | CYCLE2CYCLEDELAY | CYCLE2CYCLESAMECSEN);
+ MmioWrite32(GPMC_CONFIG7_0, MASKADDRESS_128MB | CSVALID | BASEADDRESS);
+}
+
+EFI_STATUS
+NandDetectPart (
+ VOID
+)
+{
+ UINT8 NandInfo = 0;
+ UINT8 PartInfo[5];
+ UINTN Index;
+ BOOLEAN Found = FALSE;
+
+ //Send READ ID command
+ NandSendCommand(READ_ID_CMD);
+
+ //Send one address cycle.
+ NandSendAddress(0);
+
+ //Read 5-bytes to idenfity code programmed into the NAND flash devices.
+ //BYTE 0 = Manufacture ID
+ //Byte 1 = Device ID
+ //Byte 2, 3, 4 = Nand part specific information (Page size, Block size etc)
+ for (Index = 0; Index < sizeof(PartInfo); Index++) {
+ PartInfo[Index] = MmioRead16(GPMC_NAND_DATA_0);
+ }
+
+ //Check if the ManufactureId and DeviceId are part of the currently supported nand parts.
+ for (Index = 0; Index < sizeof(gNandPartInfoTable)/sizeof(NAND_PART_INFO_TABLE); Index++) {
+ if (gNandPartInfoTable[Index].ManufactureId == PartInfo[0] && gNandPartInfoTable[Index].DeviceId == PartInfo[1]) {
+ gNandFlashInfo->BlockAddressStart = gNandPartInfoTable[Index].BlockAddressStart;
+ gNandFlashInfo->PageAddressStart = gNandPartInfoTable[Index].PageAddressStart;
+ Found = TRUE;
+ break;
+ }
+ }
+
+ if (Found == FALSE) {
+ DEBUG ((EFI_D_ERROR, "Nand part is not currently supported. Manufacture id: %x, Device id: %x\n", PartInfo[0], PartInfo[1]));
+ return EFI_NOT_FOUND;
+ }
+
+ //Populate NAND_FLASH_INFO based on the result of READ ID command.
+ gNandFlashInfo->ManufactureId = PartInfo[0];
+ gNandFlashInfo->DeviceId = PartInfo[1];
+ NandInfo = PartInfo[3];
+
+ if (PAGE_SIZE(NandInfo) == PAGE_SIZE_2K_VAL) {
+ gNandFlashInfo->PageSize = PAGE_SIZE_2K;
+ } else {
+ DEBUG ((EFI_D_ERROR, "Unknown Page size.\n"));
+ return EFI_DEVICE_ERROR;
+ }
+
+ if (SPARE_AREA_SIZE(NandInfo) == SPARE_AREA_SIZE_64B_VAL) {
+ gNandFlashInfo->SparePageSize = SPARE_AREA_SIZE_64B;
+ } else {
+ DEBUG ((EFI_D_ERROR, "Unknown Spare area size.\n"));
+ return EFI_DEVICE_ERROR;
+ }
+
+ if (BLOCK_SIZE(NandInfo) == BLOCK_SIZE_128K_VAL) {
+ gNandFlashInfo->BlockSize = BLOCK_SIZE_128K;
+ } else {
+ DEBUG ((EFI_D_ERROR, "Unknown Block size.\n"));
+ return EFI_DEVICE_ERROR;
+ }
+
+ if (ORGANIZATION(NandInfo) == ORGANIZATION_X8) {
+ gNandFlashInfo->Organization = 0;
+ } else if (ORGANIZATION(NandInfo) == ORGANIZATION_X16) {
+ gNandFlashInfo->Organization = 1;
+ }
+
+ //Calculate total number of blocks.
+ gNandFlashInfo->NumPagesPerBlock = DivU64x32(gNandFlashInfo->BlockSize, gNandFlashInfo->PageSize);
+
+ return EFI_SUCCESS;
+}
+
+VOID
+NandConfigureEcc (
+ VOID
+ )
+{
+ //Define ECC size 0 and size 1 to 512 bytes
+ MmioWrite32(GPMC_ECC_SIZE_CONFIG, (ECCSIZE0_512BYTES | ECCSIZE1_512BYTES));
+}
+
+VOID
+NandEnableEcc (
+ VOID
+ )
+{
+ //Clear all the ECC result registers and select ECC result register 1
+ MmioWrite32(GPMC_ECC_CONTROL, (ECCCLEAR | ECCPOINTER_REG1));
+
+ //Enable ECC engine on CS0
+ MmioWrite32(GPMC_ECC_CONFIG, (ECCENABLE | ECCCS_0 | ECC16B));
+}
+
+VOID
+NandDisableEcc (
+ VOID
+ )
+{
+ //Turn off ECC engine.
+ MmioWrite32(GPMC_ECC_CONFIG, ECCDISABLE);
+}
+
+VOID
+NandCalculateEcc (
+ VOID
+ )
+{
+ UINTN Index;
+ UINTN EccResultRegister;
+ UINTN EccResult;
+
+ //Capture 32-bit ECC result for each 512-bytes chunk.
+ //In our case PageSize is 2K so read ECC1-ECC4 result registers and
+ //generate total of 12-bytes of ECC code for the particular page.
+
+ EccResultRegister = GPMC_ECC1_RESULT;
+
+ for (Index = 0; Index < gNum512BytesChunks; Index++) {
+
+ EccResult = MmioRead32(EccResultRegister);
+
+ //Calculate ECC code from 32-bit ECC result value.
+ //NOTE: Following calculation is not part of TRM. We got this information
+ //from Beagleboard mailing list.
+ gEccCode[Index * 3] = EccResult & 0xFF;
+ gEccCode[(Index * 3) + 1] = (EccResult >> 16) & 0xFF;
+ gEccCode[(Index * 3) + 2] = (((EccResult >> 20) & 0xF0) | ((EccResult >> 8) & 0x0F));
+
+ //Point to next ECC result register.
+ EccResultRegister += 4;
+ }
+}
+
+EFI_STATUS
+NandReadPage (
+ IN UINTN BlockIndex,
+ IN UINTN PageIndex,
+ OUT VOID *Buffer,
+ OUT UINT8 *SpareBuffer
+)
+{
+ UINTN Address;
+ UINTN Index;
+ UINTN NumMainAreaWords = (gNandFlashInfo->PageSize/2);
+ UINTN NumSpareAreaWords = (gNandFlashInfo->SparePageSize/2);
+ UINT16 *MainAreaWordBuffer = Buffer;
+ UINT16 *SpareAreaWordBuffer = (UINT16 *)SpareBuffer;
+ UINTN Timeout = MAX_RETRY_COUNT;
+
+ //Generate device address in bytes to access specific block and page index
+ Address = GetActualPageAddressInBytes(BlockIndex, PageIndex);
+
+ //Send READ command
+ NandSendCommand(PAGE_READ_CMD);
+
+ //Send 5 Address cycles to access specific device address
+ NandSendAddressCycles(Address);
+
+ //Send READ CONFIRM command
+ NandSendCommand(PAGE_READ_CONFIRM_CMD);
+
+ //Poll till device is busy.
+ while (Timeout) {
+ if ((NandReadStatus() & NAND_READY) == NAND_READY) {
+ break;
+ }
+ Timeout--;
+ }
+
+ if (Timeout == 0) {
+ DEBUG ((EFI_D_ERROR, "Read page timed out.\n"));
+ return EFI_TIMEOUT;
+ }
+
+ //Reissue READ command
+ NandSendCommand(PAGE_READ_CMD);
+
+ //Enable ECC engine.
+ NandEnableEcc();
+
+ //Read data into the buffer.
+ for (Index = 0; Index < NumMainAreaWords; Index++) {
+ *MainAreaWordBuffer++ = MmioRead16(GPMC_NAND_DATA_0);
+ }
+
+ //Read spare area into the buffer.
+ for (Index = 0; Index < NumSpareAreaWords; Index++) {
+ *SpareAreaWordBuffer++ = MmioRead16(GPMC_NAND_DATA_0);
+ }
+
+ //Calculate ECC.
+ NandCalculateEcc();
+
+ //Turn off ECC engine.
+ NandDisableEcc();
+
+ //Perform ECC correction.
+ //Need to implement..
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+NandWritePage (
+ IN UINTN BlockIndex,
+ IN UINTN PageIndex,
+ OUT VOID *Buffer,
+ IN UINT8 *SpareBuffer
+)
+{
+ UINTN Address;
+ UINT16 *MainAreaWordBuffer = Buffer;
+ UINT16 *SpareAreaWordBuffer = (UINT16 *)SpareBuffer;
+ UINTN Index;
+ UINTN NandStatus;
+ UINTN Timeout = MAX_RETRY_COUNT;
+
+ //Generate device address in bytes to access specific block and page index
+ Address = GetActualPageAddressInBytes(BlockIndex, PageIndex);
+
+ //Send SERIAL DATA INPUT command
+ NandSendCommand(PROGRAM_PAGE_CMD);
+
+ //Send 5 Address cycles to access specific device address
+ NandSendAddressCycles(Address);
+
+ //Enable ECC engine.
+ NandEnableEcc();
+
+ //Data input from Buffer
+ for (Index = 0; Index < (gNandFlashInfo->PageSize/2); Index++) {
+ MmioWrite16(GPMC_NAND_DATA_0, *MainAreaWordBuffer++);
+
+ //After each write access, device has to wait to accept data.
+ //Currently we may not be programming proper timing parameters to
+ //the GPMC_CONFIGi_0 registers and we would need to figure that out.
+ //Without following delay, page programming fails.
+ gBS->Stall(1);
+ }
+
+ //Calculate ECC.
+ NandCalculateEcc();
+
+ //Turn off ECC engine.
+ NandDisableEcc();
+
+ //Prepare Spare area buffer with ECC codes.
+ SetMem(SpareBuffer, gNandFlashInfo->SparePageSize, 0xFF);
+ CopyMem(&SpareBuffer[ECC_POSITION], gEccCode, gNum512BytesChunks * 3);
+
+ //Program spare area with calculated ECC.
+ for (Index = 0; Index < (gNandFlashInfo->SparePageSize/2); Index++) {
+ MmioWrite16(GPMC_NAND_DATA_0, *SpareAreaWordBuffer++);
+ }
+
+ //Send PROGRAM command
+ NandSendCommand(PROGRAM_PAGE_CONFIRM_CMD);
+
+ //Poll till device is busy.
+ while (Timeout) {
+ NandStatus = NandReadStatus();
+ if ((NandStatus & NAND_READY) == NAND_READY) {
+ break;
+ }
+ Timeout--;
+ }
+
+ if (Timeout == 0) {
+ DEBUG ((EFI_D_ERROR, "Program page timed out.\n"));
+ return EFI_TIMEOUT;
+ }
+
+ //Bit0 indicates Pass/Fail status
+ if (NandStatus & NAND_FAILURE) {
+ return EFI_DEVICE_ERROR;
+ }
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+NandEraseBlock (
+ IN UINTN BlockIndex
+)
+{
+ UINTN Address;
+ UINTN NandStatus;
+ UINTN Timeout = MAX_RETRY_COUNT;
+
+ //Generate device address in bytes to access specific block and page index
+ Address = GetActualPageAddressInBytes(BlockIndex, 0);
+
+ //Send ERASE SETUP command
+ NandSendCommand(BLOCK_ERASE_CMD);
+
+ //Send 3 address cycles to device to access Page address and Block address
+ Address >>= 11; //Ignore column addresses
+
+ NandSendAddress(Address & 0xff);
+ Address >>= 8;
+
+ NandSendAddress(Address & 0xff);
+ Address >>= 8;
+
+ NandSendAddress(Address & 0xff);
+
+ //Send ERASE CONFIRM command
+ NandSendCommand(BLOCK_ERASE_CONFIRM_CMD);
+
+ //Poll till device is busy.
+ while (Timeout) {
+ NandStatus = NandReadStatus();
+ if ((NandStatus & NAND_READY) == NAND_READY) {
+ break;
+ }
+ Timeout--;
+ gBS->Stall(1);
+ }
+
+ if (Timeout == 0) {
+ DEBUG ((EFI_D_ERROR, "Erase block timed out for Block: %d.\n", BlockIndex));
+ return EFI_TIMEOUT;
+ }
+
+ //Bit0 indicates Pass/Fail status
+ if (NandStatus & NAND_FAILURE) {
+ return EFI_DEVICE_ERROR;
+ }
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+NandReadBlock (
+ IN UINTN StartBlockIndex,
+ IN UINTN EndBlockIndex,
+ OUT VOID *Buffer,
+ OUT VOID *SpareBuffer
+)
+{
+ UINTN BlockIndex;
+ UINTN PageIndex;
+ EFI_STATUS Status = EFI_SUCCESS;
+
+ for (BlockIndex = StartBlockIndex; BlockIndex <= EndBlockIndex; BlockIndex++) {
+ //For each block read number of pages
+ for (PageIndex = 0; PageIndex < gNandFlashInfo->NumPagesPerBlock; PageIndex++) {
+ Status = NandReadPage(BlockIndex, PageIndex, Buffer, SpareBuffer);
+ if (EFI_ERROR(Status)) {
+ return Status;
+ }
+ Buffer = ((UINT8 *)Buffer + gNandFlashInfo->PageSize);
+ }
+ }
+
+ return Status;
+}
+
+EFI_STATUS
+NandWriteBlock (
+ IN UINTN StartBlockIndex,
+ IN UINTN EndBlockIndex,
+ OUT VOID *Buffer,
+ OUT VOID *SpareBuffer
+ )
+{
+ UINTN BlockIndex;
+ UINTN PageIndex;
+ EFI_STATUS Status = EFI_SUCCESS;
+
+ for (BlockIndex = StartBlockIndex; BlockIndex <= EndBlockIndex; BlockIndex++) {
+ //Page programming.
+ for (PageIndex = 0; PageIndex < gNandFlashInfo->NumPagesPerBlock; PageIndex++) {
+ Status = NandWritePage(BlockIndex, PageIndex, Buffer, SpareBuffer);
+ if (EFI_ERROR(Status)) {
+ return Status;
+ }
+ Buffer = ((UINT8 *)Buffer + gNandFlashInfo->PageSize);
+ }
+ }
+
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+NandFlashReset (
+ IN EFI_BLOCK_IO_PROTOCOL *This,
+ IN BOOLEAN ExtendedVerification
+ )
+{
+ UINTN BusyStall = 50; // microSeconds
+ UINTN ResetBusyTimeout = (1000000 / BusyStall); // 1 Second
+
+ //Send RESET command to device.
+ NandSendCommand(RESET_CMD);
+
+ //Wait for 1ms before we check status register.
+ gBS->Stall(1000);
+
+ //Check BIT#5 & BIT#6 in Status register to make sure RESET is done.
+ while ((NandReadStatus() & NAND_RESET_STATUS) != NAND_RESET_STATUS) {
+
+ //In case of extended verification, wait for extended amount of time
+ //to make sure device is reset.
+ if (ExtendedVerification) {
+ if (ResetBusyTimeout == 0) {
+ return EFI_DEVICE_ERROR;
+ }
+
+ gBS->Stall(BusyStall);
+ ResetBusyTimeout--;
+ }
+ }
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+NandFlashReadBlocks (
+ IN EFI_BLOCK_IO_PROTOCOL *This,
+ IN UINT32 MediaId,
+ IN EFI_LBA Lba,
+ IN UINTN BufferSize,
+ OUT VOID *Buffer
+ )
+{
+ UINTN NumBlocks;
+ UINTN EndBlockIndex;
+ EFI_STATUS Status;
+ UINT8 *SpareBuffer = NULL;
+
+ if (Buffer == NULL) {
+ Status = EFI_INVALID_PARAMETER;
+ goto exit;
+ }
+
+ if (Lba > LAST_BLOCK) {
+ Status = EFI_INVALID_PARAMETER;
+ goto exit;
+ }
+
+ if ((BufferSize % gNandFlashInfo->BlockSize) != 0) {
+ Status = EFI_BAD_BUFFER_SIZE;
+ goto exit;
+ }
+
+ NumBlocks = DivU64x32(BufferSize, gNandFlashInfo->BlockSize);
+ EndBlockIndex = ((UINTN)Lba + NumBlocks) - 1;
+
+ SpareBuffer = (UINT8 *)AllocatePool(gNandFlashInfo->SparePageSize);
+ if (SpareBuffer == NULL) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto exit;
+ }
+
+ //Read block
+ Status = NandReadBlock((UINTN)Lba, EndBlockIndex, Buffer, SpareBuffer);
+ if (EFI_ERROR(Status)) {
+ DEBUG((EFI_D_ERROR, "Read block fails: %x\n", Status));
+ goto exit;
+ }
+
+exit:
+ if (SpareBuffer != NULL) {
+ FreePool (SpareBuffer);
+ }
+
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+NandFlashWriteBlocks (
+ IN EFI_BLOCK_IO_PROTOCOL *This,
+ IN UINT32 MediaId,
+ IN EFI_LBA Lba,
+ IN UINTN BufferSize,
+ IN VOID *Buffer
+ )
+{
+ UINTN BlockIndex;
+ UINTN NumBlocks;
+ UINTN EndBlockIndex;
+ EFI_STATUS Status;
+ UINT8 *SpareBuffer = NULL;
+
+ if (Buffer == NULL) {
+ Status = EFI_INVALID_PARAMETER;
+ goto exit;
+ }
+
+ if (Lba > LAST_BLOCK) {
+ Status = EFI_INVALID_PARAMETER;
+ goto exit;
+ }
+
+ if ((BufferSize % gNandFlashInfo->BlockSize) != 0) {
+ Status = EFI_BAD_BUFFER_SIZE;
+ goto exit;
+ }
+
+ NumBlocks = DivU64x32(BufferSize, gNandFlashInfo->BlockSize);
+ EndBlockIndex = ((UINTN)Lba + NumBlocks) - 1;
+
+ SpareBuffer = (UINT8 *)AllocatePool(gNandFlashInfo->SparePageSize);
+ if (SpareBuffer == NULL) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto exit;
+ }
+
+ // Erase block
+ for (BlockIndex = (UINTN)Lba; BlockIndex <= EndBlockIndex; BlockIndex++) {
+ Status = NandEraseBlock(BlockIndex);
+ if (EFI_ERROR(Status)) {
+ DEBUG((EFI_D_ERROR, "Erase block failed. Status: %x\n", Status));
+ goto exit;
+ }
+ }
+
+ // Program data
+ Status = NandWriteBlock((UINTN)Lba, EndBlockIndex, Buffer, SpareBuffer);
+ if (EFI_ERROR(Status)) {
+ DEBUG((EFI_D_ERROR, "Block write fails: %x\n", Status));
+ goto exit;
+ }
+
+exit:
+ if (SpareBuffer != NULL) {
+ FreePool (SpareBuffer);
+ }
+
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+NandFlashFlushBlocks (
+ IN EFI_BLOCK_IO_PROTOCOL *This
+ )
+{
+ return EFI_SUCCESS;
+}
+
+
+
+EFI_BLOCK_IO_MEDIA gNandFlashMedia = {
+ SIGNATURE_32('n','a','n','d'), // MediaId
+ FALSE, // RemovableMedia
+ TRUE, // MediaPresent
+ FALSE, // LogicalPartition
+ FALSE, // ReadOnly
+ FALSE, // WriteCaching
+ 0, // BlockSize
+ 2, // IoAlign
+ 0, // Pad
+ 0 // LastBlock
+};
+
+EFI_BLOCK_IO_PROTOCOL BlockIo =
+{
+ EFI_BLOCK_IO_INTERFACE_REVISION, // Revision
+ &gNandFlashMedia, // *Media
+ NandFlashReset, // Reset
+ NandFlashReadBlocks, // ReadBlocks
+ NandFlashWriteBlocks, // WriteBlocks
+ NandFlashFlushBlocks // FlushBlocks
+};
+
+EFI_STATUS
+NandFlashInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+
+ gNandFlashInfo = (NAND_FLASH_INFO *)AllocateZeroPool (sizeof(NAND_FLASH_INFO));
+
+ //Initialize GPMC module.
+ GpmcInit();
+
+ //Reset NAND part
+ NandFlashReset(&BlockIo, FALSE);
+
+ //Detect NAND part and populate gNandFlashInfo structure
+ Status = NandDetectPart ();
+ if (EFI_ERROR(Status)) {
+ DEBUG((EFI_D_ERROR, "Nand part id detection failure: Status: %x\n", Status));
+ return Status;
+ }
+
+ //Count total number of 512Bytes chunk based on the page size.
+ if (gNandFlashInfo->PageSize == PAGE_SIZE_512B) {
+ gNum512BytesChunks = 1;
+ } else if (gNandFlashInfo->PageSize == PAGE_SIZE_2K) {
+ gNum512BytesChunks = 4;
+ } else if (gNandFlashInfo->PageSize == PAGE_SIZE_4K) {
+ gNum512BytesChunks = 8;
+ }
+
+ gEccCode = (UINT8 *)AllocatePool(gNum512BytesChunks * 3);
+ if (gEccCode == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ //Configure ECC
+ NandConfigureEcc ();
+
+ //Patch EFI_BLOCK_IO_MEDIA structure.
+ gNandFlashMedia.BlockSize = gNandFlashInfo->BlockSize;
+ gNandFlashMedia.LastBlock = LAST_BLOCK;
+
+ //Publish BlockIO.
+ Status = gBS->InstallMultipleProtocolInterfaces (
+ &ImageHandle,
+ &gEfiBlockIoProtocolGuid, &BlockIo,
+ &gEfiDevicePathProtocolGuid, &gDevicePath,
+ NULL
+ );
+ return Status;
+}
+
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