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Improved OMTI support #202

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May 9, 2023
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Improved OMTI support #202

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66 changes: 66 additions & 0 deletions lib/SCSI2SD/src/firmware/scsi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -145,6 +145,12 @@ void process_Status()

if (scsiDev.target->cfg->quirks == S2S_CFG_QUIRKS_OMTI)
{
// All commands have a control byte, except 0xC0
if (scsiDev.cdb[0] == 0xC0)
{
control = 0;
}

// OMTI non-standard LINK control
if (control & 0x01)
{
Expand Down Expand Up @@ -389,6 +395,66 @@ static void process_Command()
scsiDev.data[2] = transfer.lba >> 8;
scsiDev.data[3] = transfer.lba;
}
else if (cfg->quirks == S2S_CFG_QUIRKS_OMTI)
{
// The response is completely non-standard.
if (likely(allocLength > 12))
allocLength = 12;
else if (unlikely(allocLength < 4))
allocLength = 4;
if (cfg->deviceType != S2S_CFG_SEQUENTIAL)
allocLength = 4;
memset(scsiDev.data, 0, allocLength);
if (scsiDev.target->sense.code == NO_SENSE)
{
// Nothing to report.
}
else if (scsiDev.target->sense.code == UNIT_ATTENTION &&
cfg->deviceType == S2S_CFG_SEQUENTIAL)
{
scsiDev.data[0] = 0x10; // Tape exception
}
else if (scsiDev.target->sense.code == ILLEGAL_REQUEST)
{
if (scsiDev.target->sense.asc == LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE)
{
if (cfg->deviceType == S2S_CFG_SEQUENTIAL)
scsiDev.data[0] = 0x10; // Tape exception
else
scsiDev.data[0] = 0x21; // Illegal Parameters
}
else if (scsiDev.target->sense.asc == INVALID_COMMAND_OPERATION_CODE)
{
scsiDev.data[0] = 0x20; // Invalid Command
}
}
else if (scsiDev.target->sense.code == NOT_READY)
{
scsiDev.data[0] = 0x04; // Drive not ready
}
else if (scsiDev.target->sense.code == BLANK_CHECK)
{
scsiDev.data[0] = 0x10; // Tape exception
}
else
{
scsiDev.data[0] = 0x11; // Uncorrectable data error
}
scsiDev.data[1] = (scsiDev.cdb[1] & 0x60) | ((transfer.lba >> 16) & 0x1F);
scsiDev.data[2] = transfer.lba >> 8;
scsiDev.data[3] = transfer.lba;
if (cfg->deviceType == S2S_CFG_SEQUENTIAL)
{
// For the tape drive there are 8 extra sense bytes.
if (scsiDev.target->sense.code == BLANK_CHECK)
scsiDev.data[11] = 0x88; // End of data recorded on the tape
else if (scsiDev.target->sense.code == UNIT_ATTENTION)
scsiDev.data[5] = 0x81; // Power On Reset occurred
else if (scsiDev.target->sense.code == ILLEGAL_REQUEST &&
scsiDev.target->sense.asc == LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE)
scsiDev.data[4] = 0x81; // File Mark detected
}
}
else
{
// As specified by the SASI and SCSI1 standard.
Expand Down