ncr53c8xx.c

linux和2410结合开发 用他可以生成2410所需的zImage文件

#define	RELOC_REGISTER	0x60000000
#if 0
#define	RELOC_KVAR	0x70000000
#endif
#define	RELOC_LABELH	0x80000000
#define	RELOC_MASK	0xf0000000

#define	NADDR(label)	(RELOC_SOFTC | offsetof(struct ncb, label))
#define PADDR(label)    (RELOC_LABEL | offsetof(struct script, label))
#define PADDRH(label)   (RELOC_LABELH | offsetof(struct scripth, label))
#define	RADDR(label)	(RELOC_REGISTER | REG(label))
#define	FADDR(label,ofs)(RELOC_REGISTER | ((REG(label))+(ofs)))
#if 0
#define	KVAR(which)	(RELOC_KVAR | (which))
#endif

#if 0
#define	SCRIPT_KVAR_JIFFIES	(0)
#define	SCRIPT_KVAR_FIRST		SCRIPT_KVAR_JIFFIES
#define	SCRIPT_KVAR_LAST		SCRIPT_KVAR_JIFFIES
/*
 * Kernel variables referenced in the scripts.
 * THESE MUST ALL BE ALIGNED TO A 4-BYTE BOUNDARY.
 */
static void *script_kvars[] __initdata =
	{ (void *)&jiffies };
#endif

static	struct script script0 __initdata = {
/*--------------------------< START >-----------------------*/ {
	/*
	**	This NOP will be patched with LED ON
	**	SCR_REG_REG (gpreg, SCR_AND, 0xfe)
	*/
	SCR_NO_OP,
		0,
	/*
	**      Clear SIGP.
	*/
	SCR_FROM_REG (ctest2),
		0,
	/*
	**	Then jump to a certain point in tryloop.
	**	Due to the lack of indirect addressing the code
	**	is self modifying here.
	*/
	SCR_JUMP,
}/*-------------------------< STARTPOS >--------------------*/,{
		PADDRH(tryloop),

}/*-------------------------< SELECT >----------------------*/,{
	/*
	**	DSA	contains the address of a scheduled
	**		data structure.
	**
	**	SCRATCHA contains the address of the script,
	**		which starts the next entry.
	**
	**	Set Initiator mode.
	**
	**	(Target mode is left as an exercise for the reader)
	*/

	SCR_CLR (SCR_TRG),
		0,
	SCR_LOAD_REG (HS_REG, HS_SELECTING),
		0,

	/*
	**      And try to select this target.
	*/
	SCR_SEL_TBL_ATN ^ offsetof (struct dsb, select),
		PADDR (reselect),

}/*-------------------------< SELECT2 >----------------------*/,{
	/*
	**	Now there are 4 possibilities:
	**
	**	(1) The ncr looses arbitration.
	**	This is ok, because it will try again,
	**	when the bus becomes idle.
	**	(But beware of the timeout function!)
	**
	**	(2) The ncr is reselected.
	**	Then the script processor takes the jump
	**	to the RESELECT label.
	**
	**	(3) The ncr wins arbitration.
	**	Then it will execute SCRIPTS instruction until 
	**	the next instruction that checks SCSI phase.
	**	Then will stop and wait for selection to be 
	**	complete or selection time-out to occur.
	**	As a result the SCRIPTS instructions until 
	**	LOADPOS + 2 should be executed in parallel with 
	**	the SCSI core performing selection.
	*/

	/*
	**	The M_REJECT problem seems to be due to a selection 
	**	timing problem.
	**	Wait immediately for the selection to complete. 
	**	(2.5x behaves so)
	*/
	SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_OUT)),
		0,

	/*
	**	Next time use the next slot.
	*/
	SCR_COPY (4),
		RADDR (temp),
		PADDR (startpos),
	/*
	**      The ncr doesn't have an indirect load
	**	or store command. So we have to
	**	copy part of the control block to a
	**	fixed place, where we can access it.
	**
	**	We patch the address part of a
	**	COPY command with the DSA-register.
	*/
	SCR_COPY_F (4),
		RADDR (dsa),
		PADDR (loadpos),
	/*
	**	then we do the actual copy.
	*/
	SCR_COPY (sizeof (struct head)),
	/*
	**	continued after the next label ...
	*/
}/*-------------------------< LOADPOS >---------------------*/,{
		0,
		NADDR (header),
	/*
	**	Wait for the next phase or the selection
	**	to complete or time-out.
	*/
	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
		PADDR (prepare),

}/*-------------------------< SEND_IDENT >----------------------*/,{
	/*
	**	Selection complete.
	**	Send the IDENTIFY and SIMPLE_TAG messages
	**	(and the M_X_SYNC_REQ message)
	*/
	SCR_MOVE_TBL ^ SCR_MSG_OUT,
		offsetof (struct dsb, smsg),
	SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
		PADDRH (resend_ident),
	SCR_LOAD_REG (scratcha, 0x80),
		0,
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (lastmsg),
}/*-------------------------< PREPARE >----------------------*/,{
	/*
	**      load the savep (saved pointer) into
	**      the TEMP register (actual pointer)
	*/
	SCR_COPY (4),
		NADDR (header.savep),
		RADDR (temp),
	/*
	**      Initialize the status registers
	*/
	SCR_COPY (4),
		NADDR (header.status),
		RADDR (scr0),
}/*-------------------------< PREPARE2 >---------------------*/,{
	/*
	**	Initialize the msgout buffer with a NOOP message.
	*/
	SCR_LOAD_REG (scratcha, M_NOOP),
		0,
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (msgout),
#if 0
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (msgin),
#endif
	/*
	**	Anticipate the COMMAND phase.
	**	This is the normal case for initial selection.
	*/
	SCR_JUMP ^ IFFALSE (WHEN (SCR_COMMAND)),
		PADDR (dispatch),

}/*-------------------------< COMMAND >--------------------*/,{
	/*
	**	... and send the command
	*/
	SCR_MOVE_TBL ^ SCR_COMMAND,
		offsetof (struct dsb, cmd),
	/*
	**	If status is still HS_NEGOTIATE, negotiation failed.
	**	We check this here, since we want to do that 
	**	only once.
	*/
	SCR_FROM_REG (HS_REG),
		0,
	SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
		SIR_NEGO_FAILED,

}/*-----------------------< DISPATCH >----------------------*/,{
	/*
	**	MSG_IN is the only phase that shall be 
	**	entered at least once for each (re)selection.
	**	So we test it first.
	*/
	SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN)),
		PADDR (msg_in),

	SCR_RETURN ^ IFTRUE (IF (SCR_DATA_OUT)),
		0,
	/*
	**	DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 4.
	**	Possible data corruption during Memory Write and Invalidate.
	**	This work-around resets the addressing logic prior to the 
	**	start of the first MOVE of a DATA IN phase.
	**	(See README.ncr53c8xx for more information)
	*/
	SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
		20,
	SCR_COPY (4),
		RADDR (scratcha),
		RADDR (scratcha),
	SCR_RETURN,
 		0,
	SCR_JUMP ^ IFTRUE (IF (SCR_STATUS)),
		PADDR (status),
	SCR_JUMP ^ IFTRUE (IF (SCR_COMMAND)),
		PADDR (command),
	SCR_JUMP ^ IFTRUE (IF (SCR_MSG_OUT)),
		PADDR (msg_out),
	/*
	**      Discard one illegal phase byte, if required.
	*/
	SCR_LOAD_REG (scratcha, XE_BAD_PHASE),
		0,
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (xerr_st),
	SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_OUT)),
		8,
	SCR_MOVE_ABS (1) ^ SCR_ILG_OUT,
		NADDR (scratch),
	SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_IN)),
		8,
	SCR_MOVE_ABS (1) ^ SCR_ILG_IN,
		NADDR (scratch),
	SCR_JUMP,
		PADDR (dispatch),

}/*-------------------------< CLRACK >----------------------*/,{
	/*
	**	Terminate possible pending message phase.
	*/
	SCR_CLR (SCR_ACK),
		0,
	SCR_JUMP,
		PADDR (dispatch),

}/*-------------------------< NO_DATA >--------------------*/,{
	/*
	**	The target wants to tranfer too much data
	**	or in the wrong direction.
	**      Remember that in extended error.
	*/
	SCR_LOAD_REG (scratcha, XE_EXTRA_DATA),
		0,
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (xerr_st),
	/*
	**      Discard one data byte, if required.
	*/
	SCR_JUMPR ^ IFFALSE (WHEN (SCR_DATA_OUT)),
		8,
	SCR_MOVE_ABS (1) ^ SCR_DATA_OUT,
		NADDR (scratch),
	SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
		8,
	SCR_MOVE_ABS (1) ^ SCR_DATA_IN,
		NADDR (scratch),
	/*
	**      .. and repeat as required.
	*/
	SCR_CALL,
		PADDR (dispatch),
	SCR_JUMP,
		PADDR (no_data),

}/*-------------------------< STATUS >--------------------*/,{
	/*
	**	get the status
	*/
	SCR_MOVE_ABS (1) ^ SCR_STATUS,
		NADDR (scratch),
	/*
	**	save status to scsi_status.
	**	mark as complete.
	*/
	SCR_TO_REG (SS_REG),
		0,
	SCR_LOAD_REG (HS_REG, HS_COMPLETE),
		0,
	SCR_JUMP,
		PADDR (dispatch),
}/*-------------------------< MSG_IN >--------------------*/,{
	/*
	**	Get the first byte of the message
	**	and save it to SCRATCHA.
	**
	**	The script processor doesn't negate the
	**	ACK signal after this transfer.
	*/
	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
		NADDR (msgin[0]),
}/*-------------------------< MSG_IN2 >--------------------*/,{
	/*
	**	Handle this message.
	*/
	SCR_JUMP ^ IFTRUE (DATA (M_COMPLETE)),
		PADDR (complete),
	SCR_JUMP ^ IFTRUE (DATA (M_DISCONNECT)),
		PADDR (disconnect),
	SCR_JUMP ^ IFTRUE (DATA (M_SAVE_DP)),
		PADDR (save_dp),
	SCR_JUMP ^ IFTRUE (DATA (M_RESTORE_DP)),
		PADDR (restore_dp),
	SCR_JUMP ^ IFTRUE (DATA (M_EXTENDED)),
		PADDRH (msg_extended),
	SCR_JUMP ^ IFTRUE (DATA (M_NOOP)),
		PADDR (clrack),
	SCR_JUMP ^ IFTRUE (DATA (M_REJECT)),
		PADDRH (msg_reject),
	SCR_JUMP ^ IFTRUE (DATA (M_IGN_RESIDUE)),
		PADDRH (msg_ign_residue),
	/*
	**	Rest of the messages left as
	**	an exercise ...
	**
	**	Unimplemented messages:
	**	fall through to MSG_BAD.
	*/
}/*-------------------------< MSG_BAD >------------------*/,{
	/*
	**	unimplemented message - reject it.
	*/
	SCR_INT,
		SIR_REJECT_SENT,
	SCR_LOAD_REG (scratcha, M_REJECT),
		0,
}/*-------------------------< SETMSG >----------------------*/,{
	SCR_COPY (1),
		RADDR (scratcha),
		NADDR (msgout),
	SCR_SET (SCR_ATN),
		0,
	SCR_JUMP,
		PADDR (clrack),
}/*-------------------------< CLEANUP >-------------------*/,{
	/*
	**      dsa:    Pointer to ccb
	**	      or xxxxxxFF (no ccb)
	**
	**      HS_REG:   Host-Status (<>0!)
	*/
	SCR_FROM_REG (dsa),
		0,
	SCR_JUMP ^ IFTRUE (DATA (0xff)),
		PADDR (start),
	/*
	**      dsa is valid.
	**	complete the cleanup.
	*/
	SCR_JUMP,
		PADDR (cleanup_ok),

}/*-------------------------< COMPLETE >-----------------*/,{
	/*
	**	Complete message.
	**
	**	Copy TEMP register to LASTP in header.
	*/
	SCR_COPY (4),
		RADDR (temp),
		NADDR (header.lastp),
	/*
	**	When we terminate the cycle by clearing ACK,
	**	the target may disconnect immediately.
	**
	**	We don't want to be told of an
	**	"unexpected disconnect",
	**	so we disable this feature.
	*/
	SCR_REG_REG (scntl2, SCR_AND, 0x7f),
		0,
	/*
	**	Terminate cycle ...
	*/
	SCR_CLR (SCR_ACK|SCR_ATN),
		0,
	/*
	**	... and wait for the disconnect.
	*/
	SCR_WAIT_DISC,
		0,
}/*-------------------------< CLEANUP_OK >----------------*/,{
	/*
	**	Save host status to header.
	*/
	SCR_COPY (4),
		RADDR (scr0),
		NADDR (header.status),
	/*
	**	and copy back the header to the ccb.
	*/
	SCR_COPY_F (4),
		RADDR (dsa),
		PADDR (cleanup0),
	SCR_COPY (sizeof (struct head)),
		NADDR (header),
}/*-------------------------< CLEANUP0 >--------------------*/,{
		0,
}/*-------------------------< SIGNAL >----------------------*/,{
	/*
	**	if job not completed ...
	*/
	SCR_FROM_REG (HS_REG),
		0,
	/*
	**	... start the next command.
	*/
	SCR_JUMP ^ IFTRUE (MASK (0, (HS_DONEMASK|HS_SKIPMASK))),
		PADDR(start),
	/*
	**	If command resulted in not GOOD status,
	**	call the C code if needed.
	*/
	SCR_FROM_REG (SS_REG),
		0,
	SCR_CALL ^ IFFALSE (DATA (S_GOOD)),
		PADDRH (bad_status),

#ifndef	SCSI_NCR_CCB_DONE_SUPPORT

	/*
	**	... signal completion to the host
	*/
	SCR_INT_FLY,
		0,
	/*
	**	Auf zu neuen Schandtaten!
	*/
	SCR_JUMP,
		PADDR(start),

#else	/* defined SCSI_NCR_CCB_DONE_SUPPORT */

	/*
	**	... signal completion to the host
	*/
	SCR_JUMP,