diff options
Diffstat (limited to 'ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c')
| -rw-r--r-- | ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c | 194 |
1 files changed, 2 insertions, 192 deletions
diff --git a/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c b/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c index 9ad0e14668..bf420853b0 100644 --- a/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c +++ b/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c @@ -531,201 +531,11 @@ FvbWrite ( IN UINT8 *Buffer
)
{
- EFI_STATUS TempStatus;
- UINT32 Tmp;
- UINT32 TmpBuf;
- UINT32 WordToWrite;
- UINT32 Mask;
- UINTN DoErase;
- UINTN BytesToWrite;
- UINTN CurOffset;
- UINTN WordAddr;
- UINTN BlockSize;
NOR_FLASH_INSTANCE *Instance;
- UINTN BlockAddress;
- UINTN PrevBlockAddress;
- PrevBlockAddress = 0;
+ Instance = INSTANCE_FROM_FVB_THIS (This);
- Instance = INSTANCE_FROM_FVB_THIS(This);
-
- if (!Instance->Initialized && Instance->Initialize) {
- Instance->Initialize(Instance);
- }
-
- DEBUG ((DEBUG_BLKIO, "FvbWrite(Parameters: Lba=%ld, Offset=0x%x, *NumBytes=0x%x, Buffer @ 0x%08x)\n", Instance->StartLba + Lba, Offset, *NumBytes, Buffer));
-
- // Detect WriteDisabled state
- if (Instance->Media.ReadOnly == TRUE) {
- DEBUG ((EFI_D_ERROR, "FvbWrite: 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 ((EFI_D_ERROR, "FvbWrite: 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 ((EFI_D_ERROR, "FvbWrite: 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 = 0;
- 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, Instance->StartLba + 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 = 1;
- 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 = 1;
- 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 = (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 = 1;
- 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 = 1;
- 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->FvbBuffer == NULL) {
- DEBUG ((EFI_D_ERROR, "FvbWrite: ERROR - Buffer not ready\n"));
- return EFI_DEVICE_ERROR;
- }
-
- // Read NOR Flash data into shadow buffer
- TempStatus = NorFlashReadBlocks (Instance, Instance->StartLba + Lba, BlockSize, Instance->FvbBuffer);
- 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->FvbBuffer + Offset), Buffer, *NumBytes);
-
- // Write the modified buffer back to the NorFlash
- TempStatus = NorFlashWriteBlocks (Instance, Instance->StartLba + Lba, BlockSize, Instance->FvbBuffer);
- if (EFI_ERROR (TempStatus)) {
- // Return one of the pre-approved error statuses
- return EFI_DEVICE_ERROR;
- }
-
- return EFI_SUCCESS;
+ return NorFlashWriteSingleBlock (Instance, Lba, Offset, NumBytes, Buffer);
}
/**
|