345 lines
13 KiB
C
345 lines
13 KiB
C
/*
|
|
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.
|
|
*
|
|
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
|
|
*
|
|
* \return Boolean \c true if the command completed successfully, \c false otherwise
|
|
*/
|
|
bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
|
|
{
|
|
bool CommandSuccess = false;
|
|
|
|
/* Run the appropriate SCSI command hander function based on the passed command */
|
|
switch (MSInterfaceInfo->State.CommandBlock.SCSICommandData[0])
|
|
{
|
|
case SCSI_CMD_INQUIRY:
|
|
CommandSuccess = SCSI_Command_Inquiry(MSInterfaceInfo);
|
|
break;
|
|
case SCSI_CMD_REQUEST_SENSE:
|
|
CommandSuccess = SCSI_Command_Request_Sense(MSInterfaceInfo);
|
|
break;
|
|
case SCSI_CMD_READ_CAPACITY_10:
|
|
CommandSuccess = SCSI_Command_Read_Capacity_10(MSInterfaceInfo);
|
|
break;
|
|
case SCSI_CMD_SEND_DIAGNOSTIC:
|
|
CommandSuccess = SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
|
|
break;
|
|
case SCSI_CMD_WRITE_10:
|
|
CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
|
|
break;
|
|
case SCSI_CMD_READ_10:
|
|
CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
|
|
break;
|
|
case SCSI_CMD_MODE_SENSE_6:
|
|
CommandSuccess = SCSI_Command_ModeSense_6(MSInterfaceInfo);
|
|
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;
|
|
MSInterfaceInfo->State.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.
|
|
*
|
|
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
|
|
*
|
|
* \return Boolean \c true if the command completed successfully, \c false otherwise.
|
|
*/
|
|
static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
|
|
{
|
|
uint16_t AllocationLength = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.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 ((MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & ((1 << 0) | (1 << 1))) ||
|
|
MSInterfaceInfo->State.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;
|
|
}
|
|
|
|
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 */
|
|
MSInterfaceInfo->State.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.
|
|
*
|
|
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
|
|
*
|
|
* \return Boolean \c true if the command completed successfully, \c false otherwise.
|
|
*/
|
|
static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
|
|
{
|
|
uint8_t AllocationLength = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
|
|
uint8_t BytesTransferred = MIN(AllocationLength, sizeof(SenseData));
|
|
|
|
Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NULL);
|
|
Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
|
|
Endpoint_ClearIN();
|
|
|
|
/* Succeed the command and update the bytes transferred counter */
|
|
MSInterfaceInfo->State.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.
|
|
*
|
|
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
|
|
*
|
|
* \return Boolean \c true if the command completed successfully, \c false otherwise.
|
|
*/
|
|
static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
|
|
{
|
|
uint32_t LastBlockAddressInLUN = (VIRTUAL_MEMORY_BLOCKS - 1);
|
|
uint32_t MediaBlockSize = VIRTUAL_MEMORY_BLOCK_SIZE;
|
|
|
|
Endpoint_Write_Stream_BE(&LastBlockAddressInLUN, sizeof(LastBlockAddressInLUN), NULL);
|
|
Endpoint_Write_Stream_BE(&MediaBlockSize, sizeof(MediaBlockSize), NULL);
|
|
Endpoint_ClearIN();
|
|
|
|
/* Succeed the command and update the bytes transferred counter */
|
|
MSInterfaceInfo->State.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.
|
|
*
|
|
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
|
|
*
|
|
* \return Boolean \c true if the command completed successfully, \c false otherwise.
|
|
*/
|
|
static bool SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
|
|
{
|
|
/* Check to see if the SELF TEST bit is not set */
|
|
if (!(MSInterfaceInfo->State.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 */
|
|
MSInterfaceInfo->State.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] 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 >= VIRTUAL_MEMORY_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;
|
|
}
|
|
|
|
/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
|
|
if (IsDataRead == DATA_READ)
|
|
DataflashManager_ReadBlocks(MSInterfaceInfo, BlockAddress, TotalBlocks);
|
|
else
|
|
DataflashManager_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;
|
|
}
|
|
|
|
/** 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.
|
|
*
|
|
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
|
|
*
|
|
* \return Boolean \c true if the command completed successfully, \c false otherwise.
|
|
*/
|
|
static bool SCSI_Command_ModeSense_6(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
|
|
{
|
|
/* 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 */
|
|
MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 4;
|
|
|
|
return true;
|
|
}
|
|
|