/** Command processing for an issued SCSI READ (10) or WRITE (10) command. This command reads in the block start address
* and total number of blocks to process, then calls the appropriate low-level Dataflash routine to handle the actual
* reading and writing of the data.
*
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
* \param[in] IsDataRead Indicates if the command is a READ (10) command or WRITE (10) command (DATA_READ or DATA_WRITE)
*
* \return Boolean \c true if the command completed successfully, \c false otherwise.
*/
static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
const bool IsDataRead)
{
uint32_t BlockAddress;
uint16_t TotalBlocks;
/* Check if the disk is write protected or not */
if ((IsDataRead == DATA_WRITE) && DISK_READ_ONLY)
{
/* Block address is invalid, update SENSE key and return command fail */
SCSI_SET_SENSE(SCSI_SENSE_KEY_DATA_PROTECT,
SCSI_ASENSE_WRITE_PROTECTED,
SCSI_ASENSEQ_NO_QUALIFIER);
return false;
}
/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
/* Load in the 16-bit total blocks (SCSI uses big-endian, so have to reverse the byte order) */
TotalBlocks = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
/* Check if the block address is outside the maximum allowable value for the LUN */
if (BlockAddress >= MMC_MediaBlocks())
{
/* Block address is invalid, update SENSE key and return command fail */
SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE,
SCSI_ASENSEQ_NO_QUALIFIER);
return false;
}
#if (TOTAL_LUNS > 1)
/* Adjust the given block address to the real media address based on the selected LUN */
BlockAddress += ((uint32_t)MSInterfaceInfo->State.CommandBlock.LUN * MMC_MediaBlocks());
#endif
/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
if (IsDataRead == DATA_READ)
MMC_ReadBlocks(MSInterfaceInfo, BlockAddress, TotalBlocks);
else
MMC_WriteBlocks(MSInterfaceInfo, BlockAddress, TotalBlocks);
/* Update the bytes transferred counter and succeed the command */
MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * VIRTUAL_MEMORY_BLOCK_SIZE);
return true;
}
/**
* @brief Reads data from EMMC block device manager
*
* @param[in] FPDConfig_p Flash device configuration of BDM
* @param[in] Pos EMMC sector where reading should start.
* @param[in] Length Number of sectors to read.
* @param[in,out] FirstBad_p Not used for eMMC.
* @param[out] Data_p Output buffer.
*
* @return ErrorCode_e Forwards the response from EMMC module.
*
* @remark This function should be called only from BDM module.
*/
ErrorCode_e Do_BDM_EMMC_Read(FPD_Config_t *const FPDConfig_p, uint32 Pos, uint32 Length, uint32 *FirstBad_p, uint8 *Data_p)
{
ErrorCode_e ReturnValue = E_GENERAL_FATAL_ERROR;
t_mmc_error MMC_Error;
void *TmpData_p = Data_p;
IDENTIFIER_NOT_USED(FirstBad_p);
// MMC interface requires uint32* for data, Data_p must be 32-bit aligned
IS_ALIGNED((uint32)Data_p);
// Jedec 84-A44 : Size < 2GB => byte addressing
if (!FPDConfig_p->HC_Card) {
Pos *= MMC_ADDRESS_MODE_FACTOR;
}
// Typecast on Data_p OK, alignment checked above
MMC_Error = MMC_ReadBlocks(1, Pos, (uint32 *)TmpData_p, FPDConfig_p->PageSize, Length, FPDConfig_p->DeviceId);
VERIFY(MMC_OK == MMC_Error, E_BDM_READ_FAILED);
ReturnValue = E_SUCCESS;
ErrorExit:
return ReturnValue;
}
