rawnandflash.c

8bit nand flash interface for at91sam9263ek,其中编辑器为keil for mdk

    unsigned short destPage)
{
    unsigned short numPages = NandFlashModel_GetBlockSizeInPages(MODEL(raw));
    unsigned int sourceRow = sourceBlock * numPages + sourcePage;
    unsigned int destRow = destBlock * numPages + destPage;
    unsigned char error = 0;

    ASSERT((sourcePage & 1) == (destPage & 1),
           "CopyPage: Source and destination page must have the same parity.\n\r");

    TRACE_DEBUG("CopyPage(B#%d:P#%d -> B#%d:P#%d)\n\r",
              sourceBlock, sourcePage, destBlock, destPage);

    // Use the copy-back facility if available
    if (NandFlashModel_SupportsCopyBack(MODEL(raw))) {

        // Start operation
        ENABLE_CE(raw);

        // Start copy-back read
        WRITE_COMMAND(raw, COMMAND_COPYBACK_READ_1);
        WriteColumnAddress(raw, 0);
        WriteRowAddress(raw, sourceRow);
        WRITE_COMMAND(raw, COMMAND_COPYBACK_READ_2);
        WaitReady(raw);

        // Start copy-back write
        WRITE_COMMAND(raw, COMMAND_COPYBACK_PROGRAM_1);
        WriteColumnAddress(raw, 0);
        WriteRowAddress(raw, destRow);
        WRITE_COMMAND(raw, COMMAND_COPYBACK_PROGRAM_2);
        WaitReady(raw);

        // Check status
        if (!IsOperationComplete(raw)) {
            TRACE_ERROR("CopyPage: Failed to copy page.\n\r");
            error = NandCommon_ERROR_CANNOTCOPY;
        }

        // Finish operation
        DISABLE_CE(raw);
    }
    else {

        // Software copy
        unsigned char data[NandCommon_MAXPAGEDATASIZE];
        unsigned char spare[NandCommon_MAXPAGESPARESIZE];
        if (RawNandFlash_ReadPage(raw, sourceBlock, sourcePage, data, spare)) {

            TRACE_ERROR("CopyPage: Failed to read page to copy\n\r");
            error = NandCommon_ERROR_CANNOTREAD;
        }
        else if (RawNandFlash_WritePage(raw, destBlock, destPage, data, spare)) {

            TRACE_ERROR("CopyPage: Failed to write dest. page\n\r");
            error = NandCommon_ERROR_CANNOTWRITE;
        }
    }

    return error;
}

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
/// Initializes a RawNandFlash instance based on the given model and physical
/// interface. If no model is provided, then the function tries to autodetect
/// it.
/// Returns 0 if initialization is successful; otherwise returns
/// NandCommon_ERROR_UNKNOWNMODEL.
/// \param raw  Pointer to a RawNandFlash instance.
/// \param model  Pointer to the underlying nand chip model. Can be 0.
/// \param commandAddress  Address at which commands are sent.
/// \param addressAddress  Address at which addresses are sent.
/// \param dataAddress  Address at which data is sent.
/// \param pinChipEnable  Pin controlling the CE signal of the NandFlash.
/// \param pinReadyBusy  Pin used to monitor the ready/busy signal of the Nand.
//------------------------------------------------------------------------------
unsigned char RawNandFlash_Initialize(
    struct RawNandFlash *raw,
    const struct NandFlashModel *model,
    unsigned int commandAddress,
    unsigned int addressAddress,
    unsigned int dataAddress,
    const Pin pinChipEnable,
    const Pin pinReadyBusy)
{
    TRACE_DEBUG("RawNandFlash_Initialize()\r\n");

    // Initialize fields
    raw->commandAddress = commandAddress;
    raw->addressAddress = addressAddress;
    raw->dataAddress = dataAddress;
    raw->pinChipEnable = pinChipEnable;
    raw->pinReadyBusy = pinReadyBusy;

    // Reset
    RawNandFlash_Reset(raw);

    // If model is not provided, autodetect it
    if (!model) {

        TRACE_DEBUG("No model provided, trying autodetection ...\n\r");
        if (NandFlashModel_Find(nandFlashModelList,
                                NandFlashModelList_SIZE,
                                RawNandFlash_ReadId(raw),
                                &(raw->model))) {

            TRACE_ERROR(
                      "RawNandFlash_Initialize: Could not autodetect chip.\n\r");
            return NandCommon_ERROR_UNKNOWNMODEL;
        }
    }
    else {

        // Copy provided model
        raw->model = *model;
    }

    return 0;
}

//------------------------------------------------------------------------------
/// Resets a NandFlash device.
/// \param raw  Pointer to a RawNandFlash instance.
//------------------------------------------------------------------------------
void RawNandFlash_Reset(const struct RawNandFlash *raw)
{
    TRACE_DEBUG("RawNandFlash_Reset()\n\r");

    ENABLE_CE(raw);
    WRITE_COMMAND16(raw, COMMAND_RESET);
    WaitReady(raw);
    DISABLE_CE(raw);
}

//------------------------------------------------------------------------------
/// Reads and returns the identifiers of a NandFlash chip.
/// \param raw  Pointer to a RawNandFlash instance.
/// \return id1|(id2<<8)|(id3<<16)|(id4<<24)
//------------------------------------------------------------------------------
unsigned int RawNandFlash_ReadId(const struct RawNandFlash *raw)
{
    unsigned int chipId;

    TRACE_DEBUG("RawNandFlash_ReadId()\n\r");

    ENABLE_CE(raw);
    WRITE_COMMAND16(raw, COMMAND_READID);
    //WRITE_COMMAND(raw, COMMAND_READID);
    WRITE_ADDRESS(raw, 0);
    chipId  = READ_DATA8(raw);
    chipId |= READ_DATA8(raw) << 8;
    chipId |= READ_DATA8(raw) << 16;
    chipId |= READ_DATA8(raw) << 24;
    DISABLE_CE(raw);

    return chipId;
}

//------------------------------------------------------------------------------
/// Erases the specified block of the device, retrying several time if it fails.
/// Returns 0 if successful; otherwise returns NandCommon_ERROR_BADBLOCK.
/// \param raw  Pointer to a RawNandFlash instance.
/// \param block  Number of the physical block to erase.
//------------------------------------------------------------------------------
unsigned char RawNandFlash_EraseBlock(
    const struct RawNandFlash *raw,
    unsigned short block)
{
	#if !defined(OP_BOOTSTRAP_on)
    unsigned char numTries = NUMERASETRIES;

    TRACE_DEBUG("RawNandFlash_EraseBlock(B#%d)\n\r", block);

    while (numTries > 0) {

        if (!EraseBlock(raw, block)) {

            return 0;
        }
        numTries--;
    }

    TRACE_ERROR("RawNandFlash_EraseBlock: Failed to erase block after %d tries\n\r", NUMERASETRIES);
    return NandCommon_ERROR_BADBLOCK;
	#else
	return EraseBlock(raw, block);
	#endif
}

//------------------------------------------------------------------------------
/// Reads the data and/or the spare areas of a page of a NandFlash into the
/// provided buffers. If a buffer pointer is 0, the corresponding area is not
/// read.
/// Returns 0 if the operation has been successful; otherwise returns 1.
/// \param raw  Pointer to a RawNandFlash instance.
/// \param block  Number of the block where the page to read resides.
/// \param page  Number of the page to read inside the given block.
/// \param data  Buffer where the data area will be stored.
/// \param spare  Buffer where the spare area will be stored.
//------------------------------------------------------------------------------
unsigned char RawNandFlash_ReadPage(
    const struct RawNandFlash *raw,
    unsigned short block,
    unsigned short page,
    void *data,
    void *spare)
{
    unsigned char hasSmallBlocks = NandFlashModel_HasSmallBlocks(MODEL(raw));
    unsigned int pageDataSize = NandFlashModel_GetPageDataSize(MODEL(raw));
    unsigned int pageSpareSize = NandFlashModel_GetPageSpareSize(MODEL(raw));
    unsigned int colAddress;
    unsigned int rowAddress;

    ASSERT(data || spare, "RawNandFlash_ReadPage: At least one area must be read\n\r");
    TRACE_DEBUG("RawNandFlash_ReadPage(B#%d:P#%d)\r\n", block, page);

    // Calculate actual address of the page
    rowAddress = block * NandFlashModel_GetBlockSizeInPages(MODEL(raw)) + page;

    // Start operation
    ENABLE_CE(raw);

    if (data) {
        colAddress = 0;
    }
    else {
        // to read spare area in sequential access
        colAddress = pageDataSize;
    }

    // Use either small blocks or large blocks data area read
    if (hasSmallBlocks) {

        WRITE_COMMAND(raw, COMMAND_READ_A);
        WriteColumnAddress(raw, colAddress);
        WriteRowAddress(raw, rowAddress);
    }
    else {

        WRITE_COMMAND(raw, COMMAND_READ_1);
        WriteColumnAddress(raw, colAddress);
        WriteRowAddress(raw, rowAddress);
        WRITE_COMMAND(raw, COMMAND_READ_2);
    }

    // Wait for the nand to be ready
    WaitReady(raw);

    // Read data area if needed
    if (data) {
        WRITE_COMMAND(raw, COMMAND_READ_1);
        ReadData(raw, (unsigned char *) data, pageDataSize);

        if (spare) {
            ReadData(raw, (unsigned char *) spare, pageSpareSize);
        }
    }
    else {
        // Read spare area only
        WRITE_COMMAND(raw, COMMAND_READ_1);
        ReadData(raw, (unsigned char *) spare, pageSpareSize);
    }

    // Disable CE
    DISABLE_CE(raw);

    return 0;
}

//------------------------------------------------------------------------------
/// Writes the data and/or the spare area of a page on a NandFlash chip. If one
/// of the buffer pointer is 0, the corresponding area is not written. Retries
/// several time if there is an error.
/// Returns 0 if the write operation is successful; otherwise returns
/// NandCommon_ERROR_BADBLOCK.
/// \param raw  Pointer to a RawNandFlash instance.
/// \param block  Number of the block where the page to write resides.
/// \param page  Number of the page to write inside the given block.
/// \param data  Buffer containing the data area.
/// \param spare  Buffer containing the spare area.
//------------------------------------------------------------------------------
unsigned char RawNandFlash_WritePage(
    const struct RawNandFlash *raw,
    unsigned short block,
    unsigned short page,
    void *data,
    void *spare)
{
    unsigned char numTries = NUMWRITETRIES;

    TRACE_DEBUG("RawNandFlash_WritePage(B#%d:P#%d)\r\n", block, page);

    while (numTries > 0) {

        if (!WritePage(raw, block, page, data, spare)) {

            return 0;
        }
        numTries--;
    }

    TRACE_ERROR("RawNandFlash_WritePage: Failed to write page after %d tries\n\r", NUMWRITETRIES);
    return NandCommon_ERROR_BADBLOCK;
}

//------------------------------------------------------------------------------
/// Copy the data in a page of the NandFlash device to an other page on that
/// same chip. Both pages must have be even or odd; it is not possible to copy
/// and even page to an odd page and vice-versa. Several retries are attempted
/// if errors are encountered.
/// Returns 0 if the operation is successful; otherwise returns
/// NandCommon_ERROR_BADBLOCK indicating that the destination block is bad.
/// \param raw  Pointer to a RawNandFlash instance.
/// \param sourceBlock  Source block number.
/// \param sourcePage  Source page number inside the source block.
/// \param destBlock  Destination block number.
/// \param destPage  Destination page number inside the destination block.
//------------------------------------------------------------------------------
unsigned char RawNandFlash_CopyPage(
    const struct RawNandFlash *raw,
    unsigned short sourceBlock,
    unsigned short sourcePage,
    unsigned short destBlock,
    unsigned short destPage)
{
    unsigned char numTries = NUMCOPYTRIES;

    TRACE_DEBUG("RawNandFlash_CopyPage(B#%d:P#%d -> B#%d:P#%d)\n\r",
              sourceBlock, sourcePage, destBlock, destPage);

    while (numTries) {

        if (!CopyPage(raw, sourceBlock, sourcePage, destBlock, destPage)) {

            return 0;
        }
        numTries--;
    }

    TRACE_ERROR("RawNandFlash_CopyPage: Failed to copy page after %d tries\n\r", NUMCOPYTRIES);
    return NandCommon_ERROR_BADBLOCK;
}

//------------------------------------------------------------------------------
/// Copies the data of one whole block of a NandFlash device to another block.
/// Returns 0 if successful; otherwise returns NandCommon_ERROR_BADBLOCK.
/// \param raw  Pointer to a RawNandFlash instance.
/// \param sourceBlock  Source block number.
/// \param destBlock  Destination block number.
//------------------------------------------------------------------------------
unsigned char RawNandFlash_CopyBlock(
    const struct RawNandFlash *raw,
    unsigned short sourceBlock,
    unsigned short destBlock)
{
    unsigned short numPages = NandFlashModel_GetBlockSizeInPages(MODEL(raw));
    unsigned int i;

    ASSERT(sourceBlock != destBlock,
           "RawNandFlash_CopyBlock: Source block must be different from dest block\n\r");
    TRACE_DEBUG("RawNandFlash_CopyBlock(B#%d->B#%d)\n\r",
              sourceBlock, destBlock);

    // Copy all pages
    for (i=0; i < numPages; i++) {

        if (RawNandFlash_CopyPage(raw, sourceBlock, i, destBlock, i)) {

            TRACE_ERROR(
                      "RawNandFlash_CopyBlock: Failed to copy page %u\n\r",
                      i);
            return NandCommon_ERROR_BADBLOCK;
        }
    }

    return 0;
}