/** @file
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Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/IoLib.h>
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#include <Library/PcdLib.h>
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#include "RamFlash.h"
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VOID *mFlashBase;
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STATIC UINTN mFdBlockSize = 0;
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STATIC UINTN mFdBlockCount = 0;
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STATIC
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UINT8*
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RamFlashPtr (
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IN EFI_LBA Lba,
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IN UINTN Offset
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)
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{
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return mFlashBase + ((UINTN)Lba * mFdBlockSize) + Offset;
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}
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/**
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Read from Ram Flash
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@param[in] Lba The starting logical block index to read from.
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@param[in] Offset Offset into the block at which to begin reading.
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@param[in] NumBytes On input, indicates the requested read size. On
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output, indicates the actual number of bytes read
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@param[in] Buffer Pointer to the buffer to read into.
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**/
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EFI_STATUS
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RamFlashRead (
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IN EFI_LBA Lba,
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IN UINTN Offset,
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IN UINTN *NumBytes,
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IN UINT8 *Buffer
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)
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{
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UINT8 *Ptr;
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//
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// Only write to the first 64k. We don't bother saving the FTW Spare
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// block into the flash memory.
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//
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if (Lba >= mFdBlockCount) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Get flash address
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//
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Ptr = (UINT8*) RamFlashPtr (Lba, Offset);
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CopyMem (Buffer, Ptr, *NumBytes);
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return EFI_SUCCESS;
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}
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/**
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Write to Ram Flash
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@param[in] Lba The starting logical block index to write to.
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@param[in] Offset Offset into the block at which to begin writing.
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@param[in] NumBytes On input, indicates the requested write size. On
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output, indicates the actual number of bytes written
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@param[in] Buffer Pointer to the data to write.
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**/
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EFI_STATUS
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RamFlashWrite (
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IN EFI_LBA Lba,
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IN UINTN Offset,
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IN UINTN *NumBytes,
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IN UINT8 *Buffer
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)
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{
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UINT8 *Ptr;
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UINTN i;
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//
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// Only write to the first 64k. We don't bother saving the FTW Spare
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// block into the flash memory.
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//
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if (Lba >= mFdBlockCount) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Program flash
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//
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Ptr = RamFlashPtr (Lba, Offset);
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for (i = 0; i < *NumBytes; i++) {
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MmioWrite8((UINTN)Ptr, Buffer[i]);
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Ptr ++;
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}
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return EFI_SUCCESS;
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}
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/**
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Erase a Ram Flash block
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@param Lba The logical block index to erase.
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**/
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EFI_STATUS
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RamFlashEraseBlock (
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IN EFI_LBA Lba
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)
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{
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return EFI_SUCCESS;
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}
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/**
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Initializes Ram flash memory support
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@retval EFI_WRITE_PROTECTED The Ram flash device is not present.
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@retval EFI_SUCCESS The Ram flash device is supported.
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**/
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EFI_STATUS
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RamFlashInitialize (
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VOID
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)
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{
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mFlashBase = (UINT8*)(UINTN) PcdGet32 (PcdVariableFdBaseAddress);
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mFdBlockSize = PcdGet32 (PcdVariableFdBlockSize);
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ASSERT(PcdGet32 (PcdVariableFdSize) % mFdBlockSize == 0);
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mFdBlockCount = PcdGet32 (PcdVariableFdSize) / mFdBlockSize;
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return EFI_SUCCESS;
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}
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