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348 lines
12 KiB
C
348 lines
12 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* SCSI command processing routines, for SCSI commands issued by the host. Mass Storage
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* devices use a thin "Bulk-Only Transport" protocol for issuing commands and status information,
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* which wrap around standard SCSI device commands for controlling the actual storage medium.
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*/
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#define INCLUDE_FROM_SCSI_C
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#include "SCSI.h"
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/** Structure to hold the SCSI response data to a SCSI INQUIRY command. This gives information about the device's
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* features and capabilities.
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*/
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SCSI_Inquiry_Response_t InquiryData =
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{
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.DeviceType = DEVICE_TYPE_BLOCK,
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.PeripheralQualifier = 0,
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.Removable = true,
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.Version = 0,
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.ResponseDataFormat = 2,
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.NormACA = false,
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.TrmTsk = false,
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.AERC = false,
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.AdditionalLength = 0x1F,
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.SoftReset = false,
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.CmdQue = false,
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.Linked = false,
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.Sync = false,
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.WideBus16Bit = false,
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.WideBus32Bit = false,
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.RelAddr = false,
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.VendorID = "LUFA",
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.ProductID = "Dataflash Disk",
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.RevisionID = {'0','.','0','0'},
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};
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/** Structure to hold the sense data for the last issued SCSI command, which is returned to the host after a SCSI REQUEST SENSE
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* command is issued. This gives information on exactly why the last command failed to complete.
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*/
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SCSI_Request_Sense_Response_t SenseData =
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{
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.ResponseCode = 0x70,
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.AdditionalLength = 0x0A,
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};
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/** Main routine to process the SCSI command located in the Command Block Wrapper read from the host. This dispatches
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* to the appropriate SCSI command handling routine if the issued command is supported by the device, else it returns
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* a command failure due to a ILLEGAL REQUEST.
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*
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* \return Boolean true if the command completed successfully, false otherwise
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*/
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bool SCSI_DecodeSCSICommand(void)
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{
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bool CommandSuccess = false;
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/* Run the appropriate SCSI command hander function based on the passed command */
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switch (CommandBlock.SCSICommandData[0])
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{
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case SCSI_CMD_INQUIRY:
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CommandSuccess = SCSI_Command_Inquiry();
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break;
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case SCSI_CMD_REQUEST_SENSE:
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CommandSuccess = SCSI_Command_Request_Sense();
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break;
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case SCSI_CMD_READ_CAPACITY_10:
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CommandSuccess = SCSI_Command_Read_Capacity_10();
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break;
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case SCSI_CMD_SEND_DIAGNOSTIC:
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CommandSuccess = SCSI_Command_Send_Diagnostic();
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break;
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case SCSI_CMD_WRITE_10:
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CommandSuccess = SCSI_Command_ReadWrite_10(DATA_WRITE);
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break;
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case SCSI_CMD_READ_10:
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CommandSuccess = SCSI_Command_ReadWrite_10(DATA_READ);
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break;
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case SCSI_CMD_MODE_SENSE_6:
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CommandSuccess = SCSI_Command_ModeSense_6();
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break;
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case SCSI_CMD_TEST_UNIT_READY:
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case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
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case SCSI_CMD_VERIFY_10:
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/* These commands should just succeed, no handling required */
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CommandSuccess = true;
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CommandBlock.DataTransferLength = 0;
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break;
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default:
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/* Update the SENSE key to reflect the invalid command */
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SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
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SCSI_ASENSE_INVALID_COMMAND,
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SCSI_ASENSEQ_NO_QUALIFIER);
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break;
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}
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/* Check if command was successfully processed */
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if (CommandSuccess)
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{
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SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
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SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
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SCSI_ASENSEQ_NO_QUALIFIER);
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return true;
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}
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return false;
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}
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/** Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features
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* and capabilities to the host.
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*
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* \return Boolean true if the command completed successfully, false otherwise.
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*/
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static bool SCSI_Command_Inquiry(void)
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{
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uint16_t AllocationLength = SwapEndian_16(*(uint16_t*)&CommandBlock.SCSICommandData[3]);
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uint16_t BytesTransferred = (AllocationLength < sizeof(InquiryData))? AllocationLength :
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sizeof(InquiryData);
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/* Only the standard INQUIRY data is supported, check if any optional INQUIRY bits set */
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if ((CommandBlock.SCSICommandData[1] & ((1 << 0) | (1 << 1))) ||
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CommandBlock.SCSICommandData[2])
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{
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/* Optional but unsupported bits set - update the SENSE key and fail the request */
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SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
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SCSI_ASENSE_INVALID_FIELD_IN_CDB,
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SCSI_ASENSEQ_NO_QUALIFIER);
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return false;
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}
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/* Write the INQUIRY data to the endpoint */
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Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, StreamCallback_AbortOnMassStoreReset);
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uint8_t PadBytes[AllocationLength - BytesTransferred];
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/* Pad out remaining bytes with 0x00 */
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Endpoint_Write_Stream_LE(&PadBytes, sizeof(PadBytes), StreamCallback_AbortOnMassStoreReset);
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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearIN();
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/* Succeed the command and update the bytes transferred counter */
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CommandBlock.DataTransferLength -= BytesTransferred;
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return true;
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}
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/** Command processing for an issued SCSI REQUEST SENSE command. This command returns information about the last issued command,
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* including the error code and additional error information so that the host can determine why a command failed to complete.
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*
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* \return Boolean true if the command completed successfully, false otherwise.
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*/
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static bool SCSI_Command_Request_Sense(void)
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{
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uint8_t AllocationLength = CommandBlock.SCSICommandData[4];
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uint8_t BytesTransferred = (AllocationLength < sizeof(SenseData))? AllocationLength : sizeof(SenseData);
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/* Send the SENSE data - this indicates to the host the status of the last command */
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Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, StreamCallback_AbortOnMassStoreReset);
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uint8_t PadBytes[AllocationLength - BytesTransferred];
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/* Pad out remaining bytes with 0x00 */
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Endpoint_Write_Stream_LE(&PadBytes, sizeof(PadBytes), StreamCallback_AbortOnMassStoreReset);
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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearIN();
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/* Succeed the command and update the bytes transferred counter */
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CommandBlock.DataTransferLength -= BytesTransferred;
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return true;
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}
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/** Command processing for an issued SCSI READ CAPACITY (10) command. This command returns information about the device's capacity
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* on the selected Logical Unit (drive), as a number of OS-sized blocks.
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*
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* \return Boolean true if the command completed successfully, false otherwise.
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*/
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static bool SCSI_Command_Read_Capacity_10(void)
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{
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/* Send the total number of logical blocks in the current LUN */
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Endpoint_Write_DWord_BE(LUN_MEDIA_BLOCKS - 1);
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/* Send the logical block size of the device (must be 512 bytes) */
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Endpoint_Write_DWord_BE(VIRTUAL_MEMORY_BLOCK_SIZE);
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/* Check if the current command is being aborted by the host */
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if (IsMassStoreReset)
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return false;
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/* Send the endpoint data packet to the host */
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Endpoint_ClearIN();
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/* Succeed the command and update the bytes transferred counter */
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CommandBlock.DataTransferLength -= 8;
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return true;
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}
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/** Command processing for an issued SCSI SEND DIAGNOSTIC command. This command performs a quick check of the Dataflash ICs on the
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* board, and indicates if they are present and functioning correctly. Only the Self-Test portion of the diagnostic command is
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* supported.
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*
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* \return Boolean true if the command completed successfully, false otherwise.
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*/
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static bool SCSI_Command_Send_Diagnostic(void)
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{
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/* Check to see if the SELF TEST bit is not set */
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if (!(CommandBlock.SCSICommandData[1] & (1 << 2)))
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{
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/* Only self-test supported - update SENSE key and fail the command */
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SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
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SCSI_ASENSE_INVALID_FIELD_IN_CDB,
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SCSI_ASENSEQ_NO_QUALIFIER);
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return false;
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}
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/* Check to see if all attached Dataflash ICs are functional */
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if (!(DataflashManager_CheckDataflashOperation()))
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{
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/* Update SENSE key with a hardware error condition and return command fail */
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SCSI_SET_SENSE(SCSI_SENSE_KEY_HARDWARE_ERROR,
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SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
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SCSI_ASENSEQ_NO_QUALIFIER);
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return false;
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}
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/* Succeed the command and update the bytes transferred counter */
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CommandBlock.DataTransferLength = 0;
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return true;
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}
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/** Command processing for an issued SCSI READ (10) or WRITE (10) command. This command reads in the block start address
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* and total number of blocks to process, then calls the appropriate low-level Dataflash routine to handle the actual
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* reading and writing of the data.
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*
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* \param[in] IsDataRead Indicates if the command is a READ (10) command or WRITE (10) command (DATA_READ or DATA_WRITE)
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*
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* \return Boolean true if the command completed successfully, false otherwise.
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*/
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static bool SCSI_Command_ReadWrite_10(const bool IsDataRead)
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{
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uint32_t BlockAddress;
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uint16_t TotalBlocks;
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/* Check if the disk is write protected or not */
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if ((IsDataRead == DATA_WRITE) && DISK_READ_ONLY)
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{
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/* Block address is invalid, update SENSE key and return command fail */
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SCSI_SET_SENSE(SCSI_SENSE_KEY_DATA_PROTECT,
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SCSI_ASENSE_WRITE_PROTECTED,
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SCSI_ASENSEQ_NO_QUALIFIER);
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return false;
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}
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BlockAddress = SwapEndian_32(*(uint32_t*)&CommandBlock.SCSICommandData[2]);
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TotalBlocks = SwapEndian_16(*(uint16_t*)&CommandBlock.SCSICommandData[7]);
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/* Check if the block address is outside the maximum allowable value for the LUN */
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if (BlockAddress >= LUN_MEDIA_BLOCKS)
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{
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/* Block address is invalid, update SENSE key and return command fail */
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SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
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SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE,
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SCSI_ASENSEQ_NO_QUALIFIER);
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return false;
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}
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#if (TOTAL_LUNS > 1)
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/* Adjust the given block address to the real media address based on the selected LUN */
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BlockAddress += ((uint32_t)CommandBlock.LUN * LUN_MEDIA_BLOCKS);
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#endif
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/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
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if (IsDataRead == DATA_READ)
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DataflashManager_ReadBlocks(BlockAddress, TotalBlocks);
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else
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DataflashManager_WriteBlocks(BlockAddress, TotalBlocks);
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/* Update the bytes transferred counter and succeed the command */
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CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * VIRTUAL_MEMORY_BLOCK_SIZE);
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return true;
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}
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/** Command processing for an issued SCSI MODE SENSE (6) command. This command returns various informational pages about
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* the SCSI device, as well as the device's Write Protect status.
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*
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* \return Boolean true if the command completed successfully, false otherwise.
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*/
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static bool SCSI_Command_ModeSense_6(void)
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{
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/* Send an empty header response with the Write Protect flag status */
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Endpoint_Write_Byte(0x00);
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Endpoint_Write_Byte(0x00);
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Endpoint_Write_Byte(DISK_READ_ONLY ? 0x80 : 0x00);
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Endpoint_Write_Byte(0x00);
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Endpoint_ClearIN();
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/* Update the bytes transferred counter and succeed the command */
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CommandBlock.DataTransferLength -= 4;
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return true;
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}
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