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295 lines
11 KiB
295 lines
11 KiB
7 years ago
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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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 2017 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 disclaims 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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static const 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 = "Bootloader",
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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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static 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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* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
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*
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* \return Boolean \c true if the command completed successfully, \c false otherwise
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*/
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bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
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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 (MSInterfaceInfo->State.CommandBlock.SCSICommandData[0])
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{
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case SCSI_CMD_INQUIRY:
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CommandSuccess = SCSI_Command_Inquiry(MSInterfaceInfo);
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break;
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case SCSI_CMD_REQUEST_SENSE:
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CommandSuccess = SCSI_Command_Request_Sense(MSInterfaceInfo);
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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(MSInterfaceInfo);
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break;
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case SCSI_CMD_WRITE_10:
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CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, 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(MSInterfaceInfo, 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(MSInterfaceInfo);
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break;
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case SCSI_CMD_START_STOP_UNIT:
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#if !defined(NO_APP_START_ON_EJECT)
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/* If the user ejected the volume, signal bootloader exit at next opportunity. */
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RunBootloader = ((MSInterfaceInfo->State.CommandBlock.SCSICommandData[4] & 0x03) != 0x02);
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#endif
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case SCSI_CMD_SEND_DIAGNOSTIC:
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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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MSInterfaceInfo->State.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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* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
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*
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* \return Boolean \c true if the command completed successfully, \c false otherwise.
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*/
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static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
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{
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uint16_t AllocationLength = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[3]);
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uint16_t BytesTransferred = MIN(AllocationLength, 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 ((MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & ((1 << 0) | (1 << 1))) ||
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MSInterfaceInfo->State.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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Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NULL);
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/* Pad out remaining bytes with 0x00 */
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Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
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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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MSInterfaceInfo->State.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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* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
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*
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* \return Boolean \c true if the command completed successfully, \c false otherwise.
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*/
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static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
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{
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uint8_t AllocationLength = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
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uint8_t BytesTransferred = MIN(AllocationLength, sizeof(SenseData));
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Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NULL);
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Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
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Endpoint_ClearIN();
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/* Succeed the command and update the bytes transferred counter */
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MSInterfaceInfo->State.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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* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
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*
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* \return Boolean \c true if the command completed successfully, \c false otherwise.
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*/
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static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
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{
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Endpoint_Write_32_BE(LUN_MEDIA_BLOCKS - 1);
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Endpoint_Write_32_BE(SECTOR_SIZE_BYTES);
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Endpoint_ClearIN();
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/* Succeed the command and update the bytes transferred counter */
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MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 8;
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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] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
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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 \c true if the command completed successfully, \c false otherwise.
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*/
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static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
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const bool IsDataRead)
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{
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uint16_t BlockAddress;
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uint16_t TotalBlocks;
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/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
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BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
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/* Load in the 16-bit total blocks (SCSI uses big-endian, so have to reverse the byte order) */
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TotalBlocks = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.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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/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
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for (uint16_t i = 0; i < TotalBlocks; i++)
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{
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if (IsDataRead == DATA_READ)
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VirtualFAT_ReadBlock(BlockAddress + i);
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else
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VirtualFAT_WriteBlock(BlockAddress + i);
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}
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/* Update the bytes transferred counter and succeed the command */
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MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * SECTOR_SIZE_BYTES);
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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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* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
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*
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* \return Boolean \c true if the command completed successfully, \c false otherwise.
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*/
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static bool SCSI_Command_ModeSense_6(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
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{
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/* Send an empty header response indicating Write Protect flag is off */
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Endpoint_Write_32_LE(0);
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Endpoint_ClearIN();
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/* Update the bytes transferred counter and succeed the command */
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MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 4;
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return true;
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}
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