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SCSIDisk.i
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1990-08-27
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{
SCSIDisk.i for PCQ Pascal
SCSI exec-level device command
}
{--------------------------------------------------------------------
*
* SCSI Command
* Several Amiga SCSI controller manufacturers are converging on
* standard ways to talk to their controllers. This include
* file describes an exec-device command (e.g. for hddisk.device)
* that can be used to issue SCSI commands
*
* UNIT NUMBERS
* Unit numbers to the OpenDevice call have encoded in them which
* SCSI device is being referred to. The three decimal digits of
* the unit number refer to the SCSI Target ID (bus address) in
* the 1's digit, the SCSI logical unit (LUN) in the 10's digit,
* and the controller board in the 100's digit.
*
* Examples:
* 0 drive at address 0
* 12 LUN 1 on multiple drive controller at address 2
* 104 second controller board, address 4
* 88 not valid: both logical units and addresses
* range from 0..7.
*
* CAVEATS
* Original 2090 code did not support this command.
*
* Commodore 2090/2090A unit numbers are different. The SCSI
* logical unit is the 100's digit, and the SCSI Target ID
* is a permuted 1's digit: Target ID 0..6 maps to unit 3..9
* (7 is reserved for the controller).
*
* Examples:
* 3 drive at address 0
* 109 drive at address 6, logical unit 1
* 1 not valid: this is not a SCSI unit. Perhaps
* it's an ST506 unit.
*
* Some controller boards generate a unique name (e.g. 2090A's
* iddisk.device) for the second controller board, instead of
* implementing the 100's digit.
*
* There are optional restrictions on the alignment, bus
* accessability, and size of the data for the data phase.
* Be conservative to work with all manufacturer's controllers.
*
*------------------------------------------------------------------}
Const
HD_SCSICMD = 28; { issue a SCSI command to the unit }
{ io_Data points to a SCSICmd }
{ io_Length is sizeof(struct SCSICmd) }
{ io_Actual and io_Offset are not used }
Type
SCSICmd = record
scsi_Data : Address; { word aligned data for SCSI Data Phase }
{ (optional) data need not be byte aligned }
{ (optional) data need not be bus accessable }
scsi_Length : Integer; { even length of Data area }
{ (optional) data can have odd length }
{ (optional) data length can be > 2**24 }
scsi_Actual : Integer; { actual Data used }
scsi_Command : Address; { SCSI Command (same options as scsi_Data) }
scsi_CmdLength : Short; { length of Command }
scsi_CmdActual : Short; { actual Command used }
scsi_Flags : Byte; { includes intended data direction }
scsi_Status : Byte; { SCSI status of command }
end;
SCSICmdPtr = ^SCSICmd;
Const
{----- scsi_Flags -----}
SCSIF_WRITE = 0; { intended data direction is out }
SCSIF_READ = 1; { intended data direction is in }
{----- SCSI io_Error values -----}
HFERR_SelfUnit = 40; { cannot issue SCSI command to self }
HFERR_DMA = 41; { DMA error }
HFERR_Phase = 42; { illegal or unexpected SCSI phase }
HFERR_Parity = 43; { SCSI parity error }
HFERR_SelTimeout = 44; { Select timed out }
HFERR_BadStatus = 45; { status and/or sense error }
{----- OpenDevice io_Error values -----}
HFERR_NoBoard = 50; { Open failed for non-existant board }