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Diffstat (limited to 'lib/lufa/Demos/Device/LowLevel/MassStorage/Lib/SCSI.c')
| -rw-r--r-- | lib/lufa/Demos/Device/LowLevel/MassStorage/Lib/SCSI.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/lib/lufa/Demos/Device/LowLevel/MassStorage/Lib/SCSI.c b/lib/lufa/Demos/Device/LowLevel/MassStorage/Lib/SCSI.c new file mode 100644 index 000000000..bb5775ca6 --- /dev/null +++ b/lib/lufa/Demos/Device/LowLevel/MassStorage/Lib/SCSI.c @@ -0,0 +1,344 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * + * SCSI command processing routines, for SCSI commands issued by the host. Mass Storage + * devices use a thin "Bulk-Only Transport" protocol for issuing commands and status information, + * which wrap around standard SCSI device commands for controlling the actual storage medium. + */ + +#define INCLUDE_FROM_SCSI_C +#include "SCSI.h" + +/** Structure to hold the SCSI response data to a SCSI INQUIRY command. This gives information about the device's + * features and capabilities. + */ +static const SCSI_Inquiry_Response_t InquiryData = + { + .DeviceType = DEVICE_TYPE_BLOCK, + .PeripheralQualifier = 0, + + .Removable = true, + + .Version = 0, + + .ResponseDataFormat = 2, + .NormACA = false, + .TrmTsk = false, + .AERC = false, + + .AdditionalLength = 0x1F, + + .SoftReset = false, + .CmdQue = false, + .Linked = false, + .Sync = false, + .WideBus16Bit = false, + .WideBus32Bit = false, + .RelAddr = false, + + .VendorID = "LUFA", + .ProductID = "Dataflash Disk", + .RevisionID = {'0','.','0','0'}, + }; + +/** Structure to hold the sense data for the last issued SCSI command, which is returned to the host after a SCSI REQUEST SENSE + * command is issued. This gives information on exactly why the last command failed to complete. + */ +static SCSI_Request_Sense_Response_t SenseData = + { + .ResponseCode = 0x70, + .AdditionalLength = 0x0A, + }; + + +/** Main routine to process the SCSI command located in the Command Block Wrapper read from the host. This dispatches + * to the appropriate SCSI command handling routine if the issued command is supported by the device, else it returns + * a command failure due to a ILLEGAL REQUEST. + * + * \return Boolean \c true if the command completed successfully, \c false otherwise + */ +bool SCSI_DecodeSCSICommand(void) +{ + bool CommandSuccess = false; + + /* Run the appropriate SCSI command hander function based on the passed command */ + switch (CommandBlock.SCSICommandData[0]) + { + case SCSI_CMD_INQUIRY: + CommandSuccess = SCSI_Command_Inquiry(); + break; + case SCSI_CMD_REQUEST_SENSE: + CommandSuccess = SCSI_Command_Request_Sense(); + break; + case SCSI_CMD_READ_CAPACITY_10: + CommandSuccess = SCSI_Command_Read_Capacity_10(); + break; + case SCSI_CMD_SEND_DIAGNOSTIC: + CommandSuccess = SCSI_Command_Send_Diagnostic(); + break; + case SCSI_CMD_WRITE_10: + CommandSuccess = SCSI_Command_ReadWrite_10(DATA_WRITE); + break; + case SCSI_CMD_READ_10: + CommandSuccess = SCSI_Command_ReadWrite_10(DATA_READ); + break; + case SCSI_CMD_MODE_SENSE_6: + CommandSuccess = SCSI_Command_ModeSense_6(); + break; + case SCSI_CMD_START_STOP_UNIT: + case SCSI_CMD_TEST_UNIT_READY: + case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL: + case SCSI_CMD_VERIFY_10: + /* These commands should just succeed, no handling required */ + CommandSuccess = true; + CommandBlock.DataTransferLength = 0; + break; + default: + /* Update the SENSE key to reflect the invalid command */ + SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST, + SCSI_ASENSE_INVALID_COMMAND, + SCSI_ASENSEQ_NO_QUALIFIER); + break; + } + + /* Check if command was successfully processed */ + if (CommandSuccess) + { + SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD, + SCSI_ASENSE_NO_ADDITIONAL_INFORMATION, + SCSI_ASENSEQ_NO_QUALIFIER); + + return true; + } + + return false; +} + +/** Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features + * and capabilities to the host. + * + * \return Boolean \c true if the command completed successfully, \c false otherwise. + */ +static bool SCSI_Command_Inquiry(void) +{ + uint16_t AllocationLength = SwapEndian_16(*(uint16_t*)&CommandBlock.SCSICommandData[3]); + uint16_t BytesTransferred = MIN(AllocationLength, sizeof(InquiryData)); + + /* Only the standard INQUIRY data is supported, check if any optional INQUIRY bits set */ + if ((CommandBlock.SCSICommandData[1] & ((1 << 0) | (1 << 1))) || + CommandBlock.SCSICommandData[2]) + { + /* Optional but unsupported bits set - update the SENSE key and fail the request */ + SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST, + SCSI_ASENSE_INVALID_FIELD_IN_CDB, + SCSI_ASENSEQ_NO_QUALIFIER); + + return false; + } + + /* Write the INQUIRY data to the endpoint */ + Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NULL); + + /* Pad out remaining bytes with 0x00 */ + Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL); + + /* Finalize the stream transfer to send the last packet */ + Endpoint_ClearIN(); + + /* Succeed the command and update the bytes transferred counter */ + CommandBlock.DataTransferLength -= BytesTransferred; + + return true; +} + +/** Command processing for an issued SCSI REQUEST SENSE command. This command returns information about the last issued command, + * including the error code and additional error information so that the host can determine why a command failed to complete. + * + * \return Boolean \c true if the command completed successfully, \c false otherwise. + */ +static bool SCSI_Command_Request_Sense(void) +{ + uint8_t AllocationLength = CommandBlock.SCSICommandData[4]; + uint8_t BytesTransferred = MIN(AllocationLength, sizeof(SenseData)); + + /* Send the SENSE data - this indicates to the host the status of the last command */ + Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NULL); + + /* Pad out remaining bytes with 0x00 */ + Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL); + + /* Finalize the stream transfer to send the last packet */ + Endpoint_ClearIN(); + + /* Succeed the command and update the bytes transferred counter */ + CommandBlock.DataTransferLength -= BytesTransferred; + + return true; +} + +/** Command processing for an issued SCSI READ CAPACITY (10) command. This command returns information about the device's capacity + * on the selected Logical Unit (drive), as a number of OS-sized blocks. + * + * \return Boolean \c true if the command completed successfully, \c false otherwise. + */ +static bool SCSI_Command_Read_Capacity_10(void) +{ + /* Send the total number of logical blocks in the current LUN */ + Endpoint_Write_32_BE(LUN_MEDIA_BLOCKS - 1); + + /* Send the logical block size of the device (must be 512 bytes) */ + Endpoint_Write_32_BE(VIRTUAL_MEMORY_BLOCK_SIZE); + + /* Check if the current command is being aborted by the host */ + if (IsMassStoreReset) + return false; + + /* Send the endpoint data packet to the host */ + Endpoint_ClearIN(); + + /* Succeed the command and update the bytes transferred counter */ + CommandBlock.DataTransferLength -= 8; + + return true; +} + +/** Command processing for an issued SCSI SEND DIAGNOSTIC command. This command performs a quick check of the Dataflash ICs on the + * board, and indicates if they are present and functioning correctly. Only the Self-Test portion of the diagnostic command is + * supported. + * + * \return Boolean \c true if the command completed successfully, \c false otherwise. + */ +static bool SCSI_Command_Send_Diagnostic(void) +{ + /* Check to see if the SELF TEST bit is not set */ + if (!(CommandBlock.SCSICommandData[1] & (1 << 2))) + { + /* Only self-test supported - update SENSE key and fail the command */ + SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST, + SCSI_ASENSE_INVALID_FIELD_IN_CDB, + SCSI_ASENSEQ_NO_QUALIFIER); + + return false; + } + + /* Check to see if all attached Dataflash ICs are functional */ + if (!(DataflashManager_CheckDataflashOperation())) + { + /* Update SENSE key with a hardware error condition and return command fail */ + SCSI_SET_SENSE(SCSI_SENSE_KEY_HARDWARE_ERROR, + SCSI_ASENSE_NO_ADDITIONAL_INFORMATION, + SCSI_ASENSEQ_NO_QUALIFIER); + + return false; + } + + /* Succeed the command and update the bytes transferred counter */ + CommandBlock.DataTransferLength = 0; + + return true; +} + +/** 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] 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(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; + } + + BlockAddress = SwapEndian_32(*(uint32_t*)&CommandBlock.SCSICommandData[2]); + TotalBlocks = SwapEndian_16(*(uint16_t*)&CommandBlock.SCSICommandData[7]); + + /* Check if the block address is outside the maximum allowable value for the LUN */ + if (BlockAddress >= LUN_MEDIA_BLOCKS) + { + /* 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)CommandBlock.LUN * LUN_MEDIA_BLOCKS); + #endif + + /* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */ + if (IsDataRead == DATA_READ) + DataflashManager_ReadBlocks(BlockAddress, TotalBlocks); + else + DataflashManager_WriteBlocks(BlockAddress, TotalBlocks); + + /* Update the bytes transferred counter and succeed the command */ + CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * VIRTUAL_MEMORY_BLOCK_SIZE); + + return true; +} + +/** Command processing for an issued SCSI MODE SENSE (6) command. This command returns various informational pages about + * the SCSI device, as well as the device's Write Protect status. + * + * \return Boolean \c true if the command completed successfully, \c false otherwise. + */ +static bool SCSI_Command_ModeSense_6(void) +{ + /* Send an empty header response with the Write Protect flag status */ + Endpoint_Write_8(0x00); + Endpoint_Write_8(0x00); + Endpoint_Write_8(DISK_READ_ONLY ? 0x80 : 0x00); + Endpoint_Write_8(0x00); + Endpoint_ClearIN(); + + /* Update the bytes transferred counter and succeed the command */ + CommandBlock.DataTransferLength -= 4; + + return true; +} + |