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- /** @file NorFlash.c
- Copyright (c) 2011 - 2020, Arm Limited. All rights reserved.<BR>
- Copyright (c) 2020, Linaro, Ltd. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include <Library/BaseMemoryLib.h>
- #include "NorFlash.h"
- //
- // Global variable declarations
- //
- extern NOR_FLASH_INSTANCE **mNorFlashInstances;
- extern UINT32 mNorFlashDeviceCount;
- UINT32
- NorFlashReadStatusRegister (
- IN NOR_FLASH_INSTANCE *Instance,
- IN UINTN SR_Address
- )
- {
- // Prepare to read the status register
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_READ_STATUS_REGISTER);
- return MmioRead32 (Instance->DeviceBaseAddress);
- }
- STATIC
- BOOLEAN
- NorFlashBlockIsLocked (
- IN NOR_FLASH_INSTANCE *Instance,
- IN UINTN BlockAddress
- )
- {
- UINT32 LockStatus;
- // Send command for reading device id
- SEND_NOR_COMMAND (BlockAddress, 2, P30_CMD_READ_DEVICE_ID);
- // Read block lock status
- LockStatus = MmioRead32 (CREATE_NOR_ADDRESS (BlockAddress, 2));
- // Decode block lock status
- LockStatus = FOLD_32BIT_INTO_16BIT (LockStatus);
- if ((LockStatus & 0x2) != 0) {
- DEBUG ((DEBUG_ERROR, "NorFlashBlockIsLocked: WARNING: Block LOCKED DOWN\n"));
- }
- return ((LockStatus & 0x1) != 0);
- }
- STATIC
- EFI_STATUS
- NorFlashUnlockSingleBlock (
- IN NOR_FLASH_INSTANCE *Instance,
- IN UINTN BlockAddress
- )
- {
- UINT32 LockStatus;
- // Raise the Task Priority Level to TPL_NOTIFY to serialise all its operations
- // and to protect shared data structures.
- if (FeaturePcdGet (PcdNorFlashCheckBlockLocked) == TRUE) {
- do {
- // Request a lock setup
- SEND_NOR_COMMAND (BlockAddress, 0, P30_CMD_LOCK_BLOCK_SETUP);
- // Request an unlock
- SEND_NOR_COMMAND (BlockAddress, 0, P30_CMD_UNLOCK_BLOCK);
- // Send command for reading device id
- SEND_NOR_COMMAND (BlockAddress, 2, P30_CMD_READ_DEVICE_ID);
- // Read block lock status
- LockStatus = MmioRead32 (CREATE_NOR_ADDRESS (BlockAddress, 2));
- // Decode block lock status
- LockStatus = FOLD_32BIT_INTO_16BIT (LockStatus);
- } while ((LockStatus & 0x1) == 1);
- } else {
- // Request a lock setup
- SEND_NOR_COMMAND (BlockAddress, 0, P30_CMD_LOCK_BLOCK_SETUP);
- // Request an unlock
- SEND_NOR_COMMAND (BlockAddress, 0, P30_CMD_UNLOCK_BLOCK);
- // Wait until the status register gives us the all clear
- do {
- LockStatus = NorFlashReadStatusRegister (Instance, BlockAddress);
- } while ((LockStatus & P30_SR_BIT_WRITE) != P30_SR_BIT_WRITE);
- }
- // Put device back into Read Array mode
- SEND_NOR_COMMAND (BlockAddress, 0, P30_CMD_READ_ARRAY);
- DEBUG ((DEBUG_BLKIO, "UnlockSingleBlock: BlockAddress=0x%08x\n", BlockAddress));
- return EFI_SUCCESS;
- }
- EFI_STATUS
- NorFlashUnlockSingleBlockIfNecessary (
- IN NOR_FLASH_INSTANCE *Instance,
- IN UINTN BlockAddress
- )
- {
- EFI_STATUS Status;
- Status = EFI_SUCCESS;
- if (NorFlashBlockIsLocked (Instance, BlockAddress)) {
- Status = NorFlashUnlockSingleBlock (Instance, BlockAddress);
- }
- return Status;
- }
- /**
- * The following function presumes that the block has already been unlocked.
- **/
- EFI_STATUS
- NorFlashEraseSingleBlock (
- IN NOR_FLASH_INSTANCE *Instance,
- IN UINTN BlockAddress
- )
- {
- EFI_STATUS Status;
- UINT32 StatusRegister;
- Status = EFI_SUCCESS;
- // Request a block erase and then confirm it
- SEND_NOR_COMMAND (BlockAddress, 0, P30_CMD_BLOCK_ERASE_SETUP);
- SEND_NOR_COMMAND (BlockAddress, 0, P30_CMD_BLOCK_ERASE_CONFIRM);
- // Wait until the status register gives us the all clear
- do {
- StatusRegister = NorFlashReadStatusRegister (Instance, BlockAddress);
- } while ((StatusRegister & P30_SR_BIT_WRITE) != P30_SR_BIT_WRITE);
- if (StatusRegister & P30_SR_BIT_VPP) {
- DEBUG ((DEBUG_ERROR, "EraseSingleBlock(BlockAddress=0x%08x: VPP Range Error\n", BlockAddress));
- Status = EFI_DEVICE_ERROR;
- }
- if ((StatusRegister & (P30_SR_BIT_ERASE | P30_SR_BIT_PROGRAM)) == (P30_SR_BIT_ERASE | P30_SR_BIT_PROGRAM)) {
- DEBUG ((DEBUG_ERROR, "EraseSingleBlock(BlockAddress=0x%08x: Command Sequence Error\n", BlockAddress));
- Status = EFI_DEVICE_ERROR;
- }
- if (StatusRegister & P30_SR_BIT_ERASE) {
- DEBUG ((DEBUG_ERROR, "EraseSingleBlock(BlockAddress=0x%08x: Block Erase Error StatusRegister:0x%X\n", BlockAddress, StatusRegister));
- Status = EFI_DEVICE_ERROR;
- }
- if (StatusRegister & P30_SR_BIT_BLOCK_LOCKED) {
- // The debug level message has been reduced because a device lock might happen. In this case we just retry it ...
- DEBUG ((DEBUG_INFO, "EraseSingleBlock(BlockAddress=0x%08x: Block Locked Error\n", BlockAddress));
- Status = EFI_WRITE_PROTECTED;
- }
- if (EFI_ERROR (Status)) {
- // Clear the Status Register
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_CLEAR_STATUS_REGISTER);
- }
- // Put device back into Read Array mode
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_READ_ARRAY);
- return Status;
- }
- EFI_STATUS
- NorFlashWriteSingleWord (
- IN NOR_FLASH_INSTANCE *Instance,
- IN UINTN WordAddress,
- IN UINT32 WriteData
- )
- {
- EFI_STATUS Status;
- UINT32 StatusRegister;
- Status = EFI_SUCCESS;
- // Request a write single word command
- SEND_NOR_COMMAND (WordAddress, 0, P30_CMD_WORD_PROGRAM_SETUP);
- // Store the word into NOR Flash;
- MmioWrite32 (WordAddress, WriteData);
- // Wait for the write to complete and then check for any errors; i.e. check the Status Register
- do {
- // Prepare to read the status register
- StatusRegister = NorFlashReadStatusRegister (Instance, WordAddress);
- // The chip is busy while the WRITE bit is not asserted
- } while ((StatusRegister & P30_SR_BIT_WRITE) != P30_SR_BIT_WRITE);
- // Perform a full status check:
- // Mask the relevant bits of Status Register.
- // Everything should be zero, if not, we have a problem
- if (StatusRegister & P30_SR_BIT_VPP) {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteSingleWord(WordAddress:0x%X): VPP Range Error\n", WordAddress));
- Status = EFI_DEVICE_ERROR;
- }
- if (StatusRegister & P30_SR_BIT_PROGRAM) {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteSingleWord(WordAddress:0x%X): Program Error\n", WordAddress));
- Status = EFI_DEVICE_ERROR;
- }
- if (StatusRegister & P30_SR_BIT_BLOCK_LOCKED) {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteSingleWord(WordAddress:0x%X): Device Protect Error\n", WordAddress));
- Status = EFI_DEVICE_ERROR;
- }
- if (!EFI_ERROR (Status)) {
- // Clear the Status Register
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_CLEAR_STATUS_REGISTER);
- }
- // Put device back into Read Array mode
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_READ_ARRAY);
- return Status;
- }
- /*
- * Writes data to the NOR Flash using the Buffered Programming method.
- *
- * The maximum size of the on-chip buffer is 32-words, because of hardware restrictions.
- * Therefore this function will only handle buffers up to 32 words or 128 bytes.
- * To deal with larger buffers, call this function again.
- *
- * This function presumes that both the TargetAddress and the TargetAddress+BufferSize
- * exist entirely within the NOR Flash. Therefore these conditions will not be checked here.
- *
- * In buffered programming, if the target address not at the beginning of a 32-bit word boundary,
- * then programming time is doubled and power consumption is increased.
- * Therefore, it is a requirement to align buffer writes to 32-bit word boundaries.
- * i.e. the last 4 bits of the target start address must be zero: 0x......00
- */
- EFI_STATUS
- NorFlashWriteBuffer (
- IN NOR_FLASH_INSTANCE *Instance,
- IN UINTN TargetAddress,
- IN UINTN BufferSizeInBytes,
- IN UINT32 *Buffer
- )
- {
- EFI_STATUS Status;
- UINTN BufferSizeInWords;
- UINTN Count;
- volatile UINT32 *Data;
- UINTN WaitForBuffer;
- BOOLEAN BufferAvailable;
- UINT32 StatusRegister;
- WaitForBuffer = MAX_BUFFERED_PROG_ITERATIONS;
- BufferAvailable = FALSE;
- // Check that the target address does not cross a 32-word boundary.
- if ((TargetAddress & BOUNDARY_OF_32_WORDS) != 0) {
- return EFI_INVALID_PARAMETER;
- }
- // Check there are some data to program
- if (BufferSizeInBytes == 0) {
- return EFI_BUFFER_TOO_SMALL;
- }
- // Check that the buffer size does not exceed the maximum hardware buffer size on chip.
- if (BufferSizeInBytes > P30_MAX_BUFFER_SIZE_IN_BYTES) {
- return EFI_BAD_BUFFER_SIZE;
- }
- // Check that the buffer size is a multiple of 32-bit words
- if ((BufferSizeInBytes % 4) != 0) {
- return EFI_BAD_BUFFER_SIZE;
- }
- // Pre-programming conditions checked, now start the algorithm.
- // Prepare the data destination address
- Data = (UINT32 *)TargetAddress;
- // Check the availability of the buffer
- do {
- // Issue the Buffered Program Setup command
- SEND_NOR_COMMAND (TargetAddress, 0, P30_CMD_BUFFERED_PROGRAM_SETUP);
- // Read back the status register bit#7 from the same address
- if (((*Data) & P30_SR_BIT_WRITE) == P30_SR_BIT_WRITE) {
- BufferAvailable = TRUE;
- }
- // Update the loop counter
- WaitForBuffer--;
- } while ((WaitForBuffer > 0) && (BufferAvailable == FALSE));
- // The buffer was not available for writing
- if (WaitForBuffer == 0) {
- Status = EFI_DEVICE_ERROR;
- goto EXIT;
- }
- // From now on we work in 32-bit words
- BufferSizeInWords = BufferSizeInBytes / (UINTN)4;
- // Write the word count, which is (buffer_size_in_words - 1),
- // because word count 0 means one word.
- SEND_NOR_COMMAND (TargetAddress, 0, (BufferSizeInWords - 1));
- // Write the data to the NOR Flash, advancing each address by 4 bytes
- for (Count = 0; Count < BufferSizeInWords; Count++, Data++, Buffer++) {
- MmioWrite32 ((UINTN)Data, *Buffer);
- }
- // Issue the Buffered Program Confirm command, to start the programming operation
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_BUFFERED_PROGRAM_CONFIRM);
- // Wait for the write to complete and then check for any errors; i.e. check the Status Register
- do {
- StatusRegister = NorFlashReadStatusRegister (Instance, TargetAddress);
- // The chip is busy while the WRITE bit is not asserted
- } while ((StatusRegister & P30_SR_BIT_WRITE) != P30_SR_BIT_WRITE);
- // Perform a full status check:
- // Mask the relevant bits of Status Register.
- // Everything should be zero, if not, we have a problem
- Status = EFI_SUCCESS;
- if (StatusRegister & P30_SR_BIT_VPP) {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteBuffer(TargetAddress:0x%X): VPP Range Error\n", TargetAddress));
- Status = EFI_DEVICE_ERROR;
- }
- if (StatusRegister & P30_SR_BIT_PROGRAM) {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteBuffer(TargetAddress:0x%X): Program Error\n", TargetAddress));
- Status = EFI_DEVICE_ERROR;
- }
- if (StatusRegister & P30_SR_BIT_BLOCK_LOCKED) {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteBuffer(TargetAddress:0x%X): Device Protect Error\n", TargetAddress));
- Status = EFI_DEVICE_ERROR;
- }
- if (!EFI_ERROR (Status)) {
- // Clear the Status Register
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_CLEAR_STATUS_REGISTER);
- }
- EXIT:
- // Put device back into Read Array mode
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_READ_ARRAY);
- return Status;
- }
- EFI_STATUS
- NorFlashWriteBlocks (
- IN NOR_FLASH_INSTANCE *Instance,
- IN EFI_LBA Lba,
- IN UINTN BufferSizeInBytes,
- IN VOID *Buffer
- )
- {
- UINT32 *pWriteBuffer;
- EFI_STATUS Status;
- EFI_LBA CurrentBlock;
- UINT32 BlockSizeInWords;
- UINT32 NumBlocks;
- UINT32 BlockCount;
- Status = EFI_SUCCESS;
- // The buffer must be valid
- if (Buffer == NULL) {
- return EFI_INVALID_PARAMETER;
- }
- if (Instance->Media.ReadOnly == TRUE) {
- return EFI_WRITE_PROTECTED;
- }
- // We must have some bytes to read
- DEBUG ((DEBUG_BLKIO, "NorFlashWriteBlocks: BufferSizeInBytes=0x%x\n", BufferSizeInBytes));
- if (BufferSizeInBytes == 0) {
- return EFI_BAD_BUFFER_SIZE;
- }
- // The size of the buffer must be a multiple of the block size
- DEBUG ((DEBUG_BLKIO, "NorFlashWriteBlocks: BlockSize in bytes =0x%x\n", Instance->Media.BlockSize));
- if ((BufferSizeInBytes % Instance->Media.BlockSize) != 0) {
- return EFI_BAD_BUFFER_SIZE;
- }
- // All blocks must be within the device
- NumBlocks = ((UINT32)BufferSizeInBytes) / Instance->Media.BlockSize;
- DEBUG ((DEBUG_BLKIO, "NorFlashWriteBlocks: NumBlocks=%d, LastBlock=%ld, Lba=%ld.\n", NumBlocks, Instance->Media.LastBlock, Lba));
- if ((Lba + NumBlocks) > (Instance->Media.LastBlock + 1)) {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteBlocks: ERROR - Write will exceed last block.\n"));
- return EFI_INVALID_PARAMETER;
- }
- BlockSizeInWords = Instance->Media.BlockSize / 4;
- // Because the target *Buffer is a pointer to VOID, we must put all the data into a pointer
- // to a proper data type, so use *ReadBuffer
- pWriteBuffer = (UINT32 *)Buffer;
- CurrentBlock = Lba;
- for (BlockCount = 0; BlockCount < NumBlocks; BlockCount++, CurrentBlock++, pWriteBuffer = pWriteBuffer + BlockSizeInWords) {
- DEBUG ((DEBUG_BLKIO, "NorFlashWriteBlocks: Writing block #%d\n", (UINTN)CurrentBlock));
- Status = NorFlashWriteFullBlock (Instance, CurrentBlock, pWriteBuffer, BlockSizeInWords);
- if (EFI_ERROR (Status)) {
- break;
- }
- }
- DEBUG ((DEBUG_BLKIO, "NorFlashWriteBlocks: Exit Status = \"%r\".\n", Status));
- return Status;
- }
- #define BOTH_ALIGNED(a, b, align) ((((UINTN)(a) | (UINTN)(b)) & ((align) - 1)) == 0)
- /**
- Copy Length bytes from Source to Destination, using aligned accesses only.
- Note that this implementation uses memcpy() semantics rather then memmove()
- semantics, i.e., SourceBuffer and DestinationBuffer should not overlap.
- @param DestinationBuffer The target of the copy request.
- @param SourceBuffer The place to copy from.
- @param Length The number of bytes to copy.
- @return Destination
- **/
- STATIC
- VOID *
- AlignedCopyMem (
- OUT VOID *DestinationBuffer,
- IN CONST VOID *SourceBuffer,
- IN UINTN Length
- )
- {
- UINT8 *Destination8;
- CONST UINT8 *Source8;
- UINT32 *Destination32;
- CONST UINT32 *Source32;
- UINT64 *Destination64;
- CONST UINT64 *Source64;
- if (BOTH_ALIGNED (DestinationBuffer, SourceBuffer, 8) && (Length >= 8)) {
- Destination64 = DestinationBuffer;
- Source64 = SourceBuffer;
- while (Length >= 8) {
- *Destination64++ = *Source64++;
- Length -= 8;
- }
- Destination8 = (UINT8 *)Destination64;
- Source8 = (CONST UINT8 *)Source64;
- } else if (BOTH_ALIGNED (DestinationBuffer, SourceBuffer, 4) && (Length >= 4)) {
- Destination32 = DestinationBuffer;
- Source32 = SourceBuffer;
- while (Length >= 4) {
- *Destination32++ = *Source32++;
- Length -= 4;
- }
- Destination8 = (UINT8 *)Destination32;
- Source8 = (CONST UINT8 *)Source32;
- } else {
- Destination8 = DestinationBuffer;
- Source8 = SourceBuffer;
- }
- while (Length-- != 0) {
- *Destination8++ = *Source8++;
- }
- return DestinationBuffer;
- }
- EFI_STATUS
- NorFlashReadBlocks (
- IN NOR_FLASH_INSTANCE *Instance,
- IN EFI_LBA Lba,
- IN UINTN BufferSizeInBytes,
- OUT VOID *Buffer
- )
- {
- UINT32 NumBlocks;
- UINTN StartAddress;
- DEBUG ((
- DEBUG_BLKIO,
- "NorFlashReadBlocks: BufferSize=0x%xB BlockSize=0x%xB LastBlock=%ld, Lba=%ld.\n",
- BufferSizeInBytes,
- Instance->Media.BlockSize,
- Instance->Media.LastBlock,
- Lba
- ));
- // The buffer must be valid
- if (Buffer == NULL) {
- return EFI_INVALID_PARAMETER;
- }
- // Return if we have not any byte to read
- if (BufferSizeInBytes == 0) {
- return EFI_SUCCESS;
- }
- // The size of the buffer must be a multiple of the block size
- if ((BufferSizeInBytes % Instance->Media.BlockSize) != 0) {
- return EFI_BAD_BUFFER_SIZE;
- }
- // All blocks must be within the device
- NumBlocks = ((UINT32)BufferSizeInBytes) / Instance->Media.BlockSize;
- if ((Lba + NumBlocks) > (Instance->Media.LastBlock + 1)) {
- DEBUG ((DEBUG_ERROR, "NorFlashReadBlocks: ERROR - Read will exceed last block\n"));
- return EFI_INVALID_PARAMETER;
- }
- // Get the address to start reading from
- StartAddress = GET_NOR_BLOCK_ADDRESS (
- Instance->RegionBaseAddress,
- Lba,
- Instance->Media.BlockSize
- );
- // Put the device into Read Array mode
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_READ_ARRAY);
- // Readout the data
- AlignedCopyMem (Buffer, (VOID *)StartAddress, BufferSizeInBytes);
- return EFI_SUCCESS;
- }
- EFI_STATUS
- NorFlashRead (
- IN NOR_FLASH_INSTANCE *Instance,
- IN EFI_LBA Lba,
- IN UINTN Offset,
- IN UINTN BufferSizeInBytes,
- OUT VOID *Buffer
- )
- {
- UINTN StartAddress;
- // The buffer must be valid
- if (Buffer == NULL) {
- return EFI_INVALID_PARAMETER;
- }
- // Return if we have not any byte to read
- if (BufferSizeInBytes == 0) {
- return EFI_SUCCESS;
- }
- if (((Lba * Instance->Media.BlockSize) + Offset + BufferSizeInBytes) > Instance->Size) {
- DEBUG ((DEBUG_ERROR, "NorFlashRead: ERROR - Read will exceed device size.\n"));
- return EFI_INVALID_PARAMETER;
- }
- // Get the address to start reading from
- StartAddress = GET_NOR_BLOCK_ADDRESS (
- Instance->RegionBaseAddress,
- Lba,
- Instance->Media.BlockSize
- );
- // Put the device into Read Array mode
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_READ_ARRAY);
- // Readout the data
- AlignedCopyMem (Buffer, (VOID *)(StartAddress + Offset), BufferSizeInBytes);
- return EFI_SUCCESS;
- }
- /*
- Write a full or portion of a block. It must not span block boundaries; that is,
- Offset + *NumBytes <= Instance->Media.BlockSize.
- */
- EFI_STATUS
- NorFlashWriteSingleBlock (
- IN NOR_FLASH_INSTANCE *Instance,
- IN EFI_LBA Lba,
- IN UINTN Offset,
- IN OUT UINTN *NumBytes,
- IN UINT8 *Buffer
- )
- {
- EFI_STATUS TempStatus;
- UINT32 Tmp;
- UINT32 TmpBuf;
- UINT32 WordToWrite;
- UINT32 Mask;
- BOOLEAN DoErase;
- UINTN BytesToWrite;
- UINTN CurOffset;
- UINTN WordAddr;
- UINTN BlockSize;
- UINTN BlockAddress;
- UINTN PrevBlockAddress;
- PrevBlockAddress = 0;
- DEBUG ((DEBUG_BLKIO, "NorFlashWriteSingleBlock(Parameters: Lba=%ld, Offset=0x%x, *NumBytes=0x%x, Buffer @ 0x%08x)\n", Lba, Offset, *NumBytes, Buffer));
- // Detect WriteDisabled state
- if (Instance->Media.ReadOnly == TRUE) {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteSingleBlock: ERROR - Can not write: Device is in WriteDisabled state.\n"));
- // It is in WriteDisabled state, return an error right away
- return EFI_ACCESS_DENIED;
- }
- // Cache the block size to avoid de-referencing pointers all the time
- BlockSize = Instance->Media.BlockSize;
- // The write must not span block boundaries.
- // We need to check each variable individually because adding two large values together overflows.
- if ((Offset >= BlockSize) ||
- (*NumBytes > BlockSize) ||
- ((Offset + *NumBytes) > BlockSize))
- {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteSingleBlock: ERROR - EFI_BAD_BUFFER_SIZE: (Offset=0x%x + NumBytes=0x%x) > BlockSize=0x%x\n", Offset, *NumBytes, BlockSize));
- return EFI_BAD_BUFFER_SIZE;
- }
- // We must have some bytes to write
- if (*NumBytes == 0) {
- DEBUG ((DEBUG_ERROR, "NorFlashWriteSingleBlock: ERROR - EFI_BAD_BUFFER_SIZE: (Offset=0x%x + NumBytes=0x%x) > BlockSize=0x%x\n", Offset, *NumBytes, BlockSize));
- return EFI_BAD_BUFFER_SIZE;
- }
- // Pick 128bytes as a good start for word operations as opposed to erasing the
- // block and writing the data regardless if an erase is really needed.
- // It looks like most individual NV variable writes are smaller than 128bytes.
- if (*NumBytes <= 128) {
- // Check to see if we need to erase before programming the data into NOR.
- // If the destination bits are only changing from 1s to 0s we can just write.
- // After a block is erased all bits in the block is set to 1.
- // If any byte requires us to erase we just give up and rewrite all of it.
- DoErase = FALSE;
- BytesToWrite = *NumBytes;
- CurOffset = Offset;
- while (BytesToWrite > 0) {
- // Read full word from NOR, splice as required. A word is the smallest
- // unit we can write.
- TempStatus = NorFlashRead (Instance, Lba, CurOffset & ~(0x3), sizeof (Tmp), &Tmp);
- if (EFI_ERROR (TempStatus)) {
- return EFI_DEVICE_ERROR;
- }
- // Physical address of word in NOR to write.
- WordAddr = (CurOffset & ~(0x3)) + GET_NOR_BLOCK_ADDRESS (
- Instance->RegionBaseAddress,
- Lba,
- BlockSize
- );
- // The word of data that is to be written.
- TmpBuf = *((UINT32 *)(Buffer + (*NumBytes - BytesToWrite)));
- // First do word aligned chunks.
- if ((CurOffset & 0x3) == 0) {
- if (BytesToWrite >= 4) {
- // Is the destination still in 'erased' state?
- if (~Tmp != 0) {
- // Check to see if we are only changing bits to zero.
- if ((Tmp ^ TmpBuf) & TmpBuf) {
- DoErase = TRUE;
- break;
- }
- }
- // Write this word to NOR
- WordToWrite = TmpBuf;
- CurOffset += sizeof (TmpBuf);
- BytesToWrite -= sizeof (TmpBuf);
- } else {
- // BytesToWrite < 4. Do small writes and left-overs
- Mask = ~((~0) << (BytesToWrite * 8));
- // Mask out the bytes we want.
- TmpBuf &= Mask;
- // Is the destination still in 'erased' state?
- if ((Tmp & Mask) != Mask) {
- // Check to see if we are only changing bits to zero.
- if ((Tmp ^ TmpBuf) & TmpBuf) {
- DoErase = TRUE;
- break;
- }
- }
- // Merge old and new data. Write merged word to NOR
- WordToWrite = (Tmp & ~Mask) | TmpBuf;
- CurOffset += BytesToWrite;
- BytesToWrite = 0;
- }
- } else {
- // Do multiple words, but starting unaligned.
- if (BytesToWrite > (4 - (CurOffset & 0x3))) {
- Mask = ((~0) << ((CurOffset & 0x3) * 8));
- // Mask out the bytes we want.
- TmpBuf &= Mask;
- // Is the destination still in 'erased' state?
- if ((Tmp & Mask) != Mask) {
- // Check to see if we are only changing bits to zero.
- if ((Tmp ^ TmpBuf) & TmpBuf) {
- DoErase = TRUE;
- break;
- }
- }
- // Merge old and new data. Write merged word to NOR
- WordToWrite = (Tmp & ~Mask) | TmpBuf;
- BytesToWrite -= (4 - (CurOffset & 0x3));
- CurOffset += (4 - (CurOffset & 0x3));
- } else {
- // Unaligned and fits in one word.
- Mask = (~((~0) << (BytesToWrite * 8))) << ((CurOffset & 0x3) * 8);
- // Mask out the bytes we want.
- TmpBuf = (TmpBuf << ((CurOffset & 0x3) * 8)) & Mask;
- // Is the destination still in 'erased' state?
- if ((Tmp & Mask) != Mask) {
- // Check to see if we are only changing bits to zero.
- if ((Tmp ^ TmpBuf) & TmpBuf) {
- DoErase = TRUE;
- break;
- }
- }
- // Merge old and new data. Write merged word to NOR
- WordToWrite = (Tmp & ~Mask) | TmpBuf;
- CurOffset += BytesToWrite;
- BytesToWrite = 0;
- }
- }
- //
- // Write the word to NOR.
- //
- BlockAddress = GET_NOR_BLOCK_ADDRESS (Instance->RegionBaseAddress, Lba, BlockSize);
- if (BlockAddress != PrevBlockAddress) {
- TempStatus = NorFlashUnlockSingleBlockIfNecessary (Instance, BlockAddress);
- if (EFI_ERROR (TempStatus)) {
- return EFI_DEVICE_ERROR;
- }
- PrevBlockAddress = BlockAddress;
- }
- TempStatus = NorFlashWriteSingleWord (Instance, WordAddr, WordToWrite);
- if (EFI_ERROR (TempStatus)) {
- return EFI_DEVICE_ERROR;
- }
- }
- // Exit if we got here and could write all the data. Otherwise do the
- // Erase-Write cycle.
- if (!DoErase) {
- return EFI_SUCCESS;
- }
- }
- // Check we did get some memory. Buffer is BlockSize.
- if (Instance->ShadowBuffer == NULL) {
- DEBUG ((DEBUG_ERROR, "FvbWrite: ERROR - Buffer not ready\n"));
- return EFI_DEVICE_ERROR;
- }
- // Read NOR Flash data into shadow buffer
- TempStatus = NorFlashReadBlocks (Instance, Lba, BlockSize, Instance->ShadowBuffer);
- if (EFI_ERROR (TempStatus)) {
- // Return one of the pre-approved error statuses
- return EFI_DEVICE_ERROR;
- }
- // Put the data at the appropriate location inside the buffer area
- CopyMem ((VOID *)((UINTN)Instance->ShadowBuffer + Offset), Buffer, *NumBytes);
- // Write the modified buffer back to the NorFlash
- TempStatus = NorFlashWriteBlocks (Instance, Lba, BlockSize, Instance->ShadowBuffer);
- if (EFI_ERROR (TempStatus)) {
- // Return one of the pre-approved error statuses
- return EFI_DEVICE_ERROR;
- }
- return EFI_SUCCESS;
- }
- /*
- Although DiskIoDxe will automatically install the DiskIO protocol whenever
- we install the BlockIO protocol, its implementation is sub-optimal as it reads
- and writes entire blocks using the BlockIO protocol. In fact we can access
- NOR flash with a finer granularity than that, so we can improve performance
- by directly producing the DiskIO protocol.
- */
- /**
- Read BufferSize bytes from Offset into Buffer.
- @param This Protocol instance pointer.
- @param MediaId Id of the media, changes every time the media is replaced.
- @param Offset The starting byte offset to read from
- @param BufferSize Size of Buffer
- @param Buffer Buffer containing read data
- @retval EFI_SUCCESS The data was read correctly from the device.
- @retval EFI_DEVICE_ERROR The device reported an error while performing the read.
- @retval EFI_NO_MEDIA There is no media in the device.
- @retval EFI_MEDIA_CHANGED The MediaId does not match the current device.
- @retval EFI_INVALID_PARAMETER The read request contains device addresses that are not
- valid for the device.
- **/
- EFI_STATUS
- EFIAPI
- NorFlashDiskIoReadDisk (
- IN EFI_DISK_IO_PROTOCOL *This,
- IN UINT32 MediaId,
- IN UINT64 DiskOffset,
- IN UINTN BufferSize,
- OUT VOID *Buffer
- )
- {
- NOR_FLASH_INSTANCE *Instance;
- UINT32 BlockSize;
- UINT32 BlockOffset;
- EFI_LBA Lba;
- Instance = INSTANCE_FROM_DISKIO_THIS (This);
- if (MediaId != Instance->Media.MediaId) {
- return EFI_MEDIA_CHANGED;
- }
- BlockSize = Instance->Media.BlockSize;
- Lba = (EFI_LBA)DivU64x32Remainder (DiskOffset, BlockSize, &BlockOffset);
- return NorFlashRead (Instance, Lba, BlockOffset, BufferSize, Buffer);
- }
- /**
- Writes a specified number of bytes to a device.
- @param This Indicates a pointer to the calling context.
- @param MediaId ID of the medium to be written.
- @param Offset The starting byte offset on the logical block I/O device to write.
- @param BufferSize The size in bytes of Buffer. The number of bytes to write to the device.
- @param Buffer A pointer to the buffer containing the data to be written.
- @retval EFI_SUCCESS The data was written correctly to the device.
- @retval EFI_WRITE_PROTECTED The device can not be written to.
- @retval EFI_DEVICE_ERROR The device reported an error while performing the write.
- @retval EFI_NO_MEDIA There is no media in the device.
- @retval EFI_MEDIA_CHANGED The MediaId does not match the current device.
- @retval EFI_INVALID_PARAMETER The write request contains device addresses that are not
- valid for the device.
- **/
- EFI_STATUS
- EFIAPI
- NorFlashDiskIoWriteDisk (
- IN EFI_DISK_IO_PROTOCOL *This,
- IN UINT32 MediaId,
- IN UINT64 DiskOffset,
- IN UINTN BufferSize,
- IN VOID *Buffer
- )
- {
- NOR_FLASH_INSTANCE *Instance;
- UINT32 BlockSize;
- UINT32 BlockOffset;
- EFI_LBA Lba;
- UINTN RemainingBytes;
- UINTN WriteSize;
- EFI_STATUS Status;
- Instance = INSTANCE_FROM_DISKIO_THIS (This);
- if (MediaId != Instance->Media.MediaId) {
- return EFI_MEDIA_CHANGED;
- }
- BlockSize = Instance->Media.BlockSize;
- Lba = (EFI_LBA)DivU64x32Remainder (DiskOffset, BlockSize, &BlockOffset);
- RemainingBytes = BufferSize;
- // Write either all the remaining bytes, or the number of bytes that bring
- // us up to a block boundary, whichever is less.
- // (DiskOffset | (BlockSize - 1)) + 1) rounds DiskOffset up to the next
- // block boundary (even if it is already on one).
- WriteSize = MIN (RemainingBytes, ((DiskOffset | (BlockSize - 1)) + 1) - DiskOffset);
- do {
- if (WriteSize == BlockSize) {
- // Write a full block
- Status = NorFlashWriteFullBlock (Instance, Lba, Buffer, BlockSize / sizeof (UINT32));
- } else {
- // Write a partial block
- Status = NorFlashWriteSingleBlock (Instance, Lba, BlockOffset, &WriteSize, Buffer);
- }
- if (EFI_ERROR (Status)) {
- return Status;
- }
- // Now continue writing either all the remaining bytes or single blocks.
- RemainingBytes -= WriteSize;
- Buffer = (UINT8 *)Buffer + WriteSize;
- Lba++;
- BlockOffset = 0;
- WriteSize = MIN (RemainingBytes, BlockSize);
- } while (RemainingBytes);
- return Status;
- }
- EFI_STATUS
- NorFlashReset (
- IN NOR_FLASH_INSTANCE *Instance
- )
- {
- // As there is no specific RESET to perform, ensure that the devices is in the default Read Array mode
- SEND_NOR_COMMAND (Instance->DeviceBaseAddress, 0, P30_CMD_READ_ARRAY);
- return EFI_SUCCESS;
- }
- /**
- Fixup internal data so that EFI can be call in virtual mode.
- Call the passed in Child Notify event and convert any pointers in
- lib to virtual mode.
- @param[in] Event The Event that is being processed
- @param[in] Context Event Context
- **/
- VOID
- EFIAPI
- NorFlashVirtualNotifyEvent (
- IN EFI_EVENT Event,
- IN VOID *Context
- )
- {
- UINTN Index;
- for (Index = 0; Index < mNorFlashDeviceCount; Index++) {
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->DeviceBaseAddress);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->RegionBaseAddress);
- // Convert BlockIo protocol
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->BlockIoProtocol.FlushBlocks);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->BlockIoProtocol.ReadBlocks);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->BlockIoProtocol.Reset);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->BlockIoProtocol.WriteBlocks);
- // Convert Fvb
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->FvbProtocol.EraseBlocks);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->FvbProtocol.GetAttributes);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->FvbProtocol.GetBlockSize);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->FvbProtocol.GetPhysicalAddress);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->FvbProtocol.Read);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->FvbProtocol.SetAttributes);
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->FvbProtocol.Write);
- if (mNorFlashInstances[Index]->ShadowBuffer != NULL) {
- EfiConvertPointer (0x0, (VOID **)&mNorFlashInstances[Index]->ShadowBuffer);
- }
- }
- return;
- }
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