/*-----------------------------------------------------------------------------*
* This routine queues an SRB to reset the SCSI Bus
*
*-----------------------------------------------------------------------------*/
void Sym8xxSCSIController::resetCommand( IOSCSIParallelCommand *scsiCommand )
{
SRB * srb;
IOMemoryDescriptor * iomd;
// printf( "SCSI(Symbios8xx): resetCommand\n\r" );
srb = (SRB *) scsiCommand->getCommandData();
bzero( srb, sizeof(SRB) );
iomd = SCSI_IOMDs[ SCSI_RESET_IOMD ]; // special "target" for reset
srb->srbIOMD = iomd; // save in SRB for later ->complete() call
// ::initWithAddress() causes any previous contents of IOMD to be ::complete()'d
if ( iomd->initWithAddress( srb, sizeof( SRB ), kIODirectionOutIn ) )
{
iomd->prepare();
srb->srbPhys = (SRB *) iomd->getPhysicalAddress();
}
else
{
// this should never happen, as we have allocated enough
// IOMDs for MAX_SCSI_TARGETS plus 2 extra for reset and
// a "fudge factor" just in case.
panic( "Sym8xxSCSIController::resetCommand - IOMemoryDescriptor reinitialization failed" );
}
srb->scsiCommand = scsiCommand;
Sym8xxSCSIBusReset( srb );
}
/*-----------------------------------------------------------------------------*
*
*-----------------------------------------------------------------------------*/
void Sym8xxSCSIController::executeCommand( IOSCSIParallelCommand *scsiCommand )
{
SRB *srb = NULL;
SCSICDBInfo scsiCDB;
SCSITargetLun targetLun;
Nexus *nexus;
Nexus *nexusPhys;
UInt32 len;
bool isWrite;
IOMemoryDescriptor * iomd;
srb = (SRB *) scsiCommand->getCommandData();
bzero( srb, sizeof(SRB) );
srb->scsiCommand = scsiCommand;
scsiCommand->getCDB( &scsiCDB );
scsiCommand->getTargetLun( &targetLun );
srb->target = targetLun.target;
srb->lun = targetLun.lun;
srb->srbCDBFlags = scsiCDB.cdbFlags;
// 1 IOMD per target, since only 1 transaction possible with current architecture
iomd = SCSI_IOMDs[(int) srb->target ];
srb->srbIOMD = iomd;
// ::initWithAddress() causes any previous IOMDs to be ::complete()'d
if ( iomd->initWithAddress( srb, sizeof( SRB ), kIODirectionOutIn ) )
{
iomd->prepare();
srb->srbPhys = (SRB *) iomd->getPhysicalAddress();
}
else
{
// this should never happen, as we have allocated enough
// IOMDs for MAX_SCSI_TARGETS plus 1 extra for reset
panic( "Sym8xxSCSIController::executeCommand - IOMemoryDescriptor reinitialization failed" );
}
/*
* Setup the Nexus struct. This part of the SRB is read/written both by the
* script and the driver.
*/
nexus = &srb->nexus;
nexusPhys = &srb->srbPhys->nexus;
nexus->targetParms.target = srb->target;
// printf( "SCSI(Symbios8xx): executeCommand: T/L = %d:%d Cmd = %08x CmdType = %d\n\r",
// targetLun.target, targetLun.lun, (int)scsiCommand, scsiCommand->getCmdType() );
switch ( scsiCommand->getCmdType() )
{
case kSCSICommandAbort:
case kSCSICommandAbortAll:
case kSCSICommandDeviceReset:
Sym8xxAbortCommand( scsiCommand );
return;
default:
;
}
/*
* Set client data buffer pointers in the SRB
*/
scsiCommand->getPointers( &srb->xferDesc, &srb->xferCount, &isWrite );
srb->directionMask = (isWrite) ? 0x00000000 :0x01000000;
nexus->cdb.ppData = OSSwapHostToLittleInt32((UInt32)&nexusPhys->cdbData);
len = scsiCDB.cdbLength;
nexus->cdb.length = OSSwapHostToLittleInt32( len );
// implicit copying of arrays is not desireable. explicitly spell out what is being copied
// [rdar://problem/4092008]
// nexus->cdbData = scsiCDB.cdb;
bcopy( &scsiCDB.cdb, &nexus->cdbData, sizeof( nexus->cdbData ) );
Sym8xxCalcMsgs( scsiCommand );
/*
* Setup initial data transfer list (SGList)
*/
nexus->ppSGList = (SGEntry *)OSSwapHostToLittleInt32((UInt32)&nexusPhys->sgListData[2]);
Sym8xxUpdateSGList( srb );
Sym8xxStartSRB( srb );
}