ncr53c8xx.c

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#define  QU_REG	scr0
#define  HS_REG	scr1
#define  HS_PRT	nc_scr1
#define  SS_REG	scr2
#define  SS_PRT	nc_scr2
#define  PS_REG	scr3

/*
**	Last four bytes (host)
*/
#ifdef SCSI_NCR_BIG_ENDIAN
#define  actualquirks  phys.header.status[3]
#define  host_status   phys.header.status[2]
#define  scsi_status   phys.header.status[1]
#define  parity_status phys.header.status[0]
#else
#define  actualquirks  phys.header.status[0]
#define  host_status   phys.header.status[1]
#define  scsi_status   phys.header.status[2]
#define  parity_status phys.header.status[3]
#endif

/*
**	First four bytes (script)
*/
#define  xerr_st       header.scr_st[0]
#define  sync_st       header.scr_st[1]
#define  nego_st       header.scr_st[2]
#define  wide_st       header.scr_st[3]

/*
**	First four bytes (host)
*/
#define  xerr_status   phys.xerr_st
#define  nego_status   phys.nego_st

#if 0
#define  sync_status   phys.sync_st
#define  wide_status   phys.wide_st
#endif

/*==========================================================
**
**      Declaration of structs:     Data structure block
**
**==========================================================
**
**	During execution of a ccb by the script processor,
**	the DSA (data structure address) register points
**	to this substructure of the ccb.
**	This substructure contains the header with
**	the script-processor-changeable data and
**	data blocks for the indirect move commands.
**
**----------------------------------------------------------
*/

struct dsb {

	/*
	**	Header.
	*/

	struct head	header;

	/*
	**	Table data for Script
	*/

	struct scr_tblsel  select;
	struct scr_tblmove smsg  ;
	struct scr_tblmove cmd   ;
	struct scr_tblmove sense ;
	struct scr_tblmove data[MAX_SCATTER];
};


/*========================================================================
**
**      Declaration of structs:     Command control block.
**
**========================================================================
*/
struct ccb {
	/*----------------------------------------------------------------
	**	This is the data structure which is pointed by the DSA 
	**	register when it is executed by the script processor.
	**	It must be the first entry because it contains the header 
	**	as first entry that must be cache line aligned.
	**----------------------------------------------------------------
	*/
	struct dsb	phys;

	/*----------------------------------------------------------------
	**	Mini-script used at CCB execution start-up.
	**	Load the DSA with the data structure address (phys) and 
	**	jump to SELECT. Jump to CANCEL if CCB is to be canceled.
	**----------------------------------------------------------------
	*/
	struct launch	start;

	/*----------------------------------------------------------------
	**	Mini-script used at CCB relection to restart the nexus.
	**	Load the DSA with the data structure address (phys) and 
	**	jump to RESEL_DSA. Jump to ABORT if CCB is to be aborted.
	**----------------------------------------------------------------
	*/
	struct launch	restart;

	/*----------------------------------------------------------------
	**	If a data transfer phase is terminated too early
	**	(after reception of a message (i.e. DISCONNECT)),
	**	we have to prepare a mini script to transfer
	**	the rest of the data.
	**----------------------------------------------------------------
	*/
	ncrcmd		patch[8];

	/*----------------------------------------------------------------
	**	The general SCSI driver provides a
	**	pointer to a control block.
	**----------------------------------------------------------------
	*/
	struct scsi_cmnd	*cmd;		/* SCSI command 		*/
	u_char		cdb_buf[16];	/* Copy of CDB			*/
	u_char		sense_buf[64];
	int		data_len;	/* Total data length		*/

	/*----------------------------------------------------------------
	**	Message areas.
	**	We prepare a message to be sent after selection.
	**	We may use a second one if the command is rescheduled 
	**	due to GETCC or QFULL.
	**      Contents are IDENTIFY and SIMPLE_TAG.
	**	While negotiating sync or wide transfer,
	**	a SDTR or WDTR message is appended.
	**----------------------------------------------------------------
	*/
	u_char		scsi_smsg [8];
	u_char		scsi_smsg2[8];

	/*----------------------------------------------------------------
	**	Other fields.
	**----------------------------------------------------------------
	*/
	u_long		p_ccb;		/* BUS address of this CCB	*/
	u_char		sensecmd[6];	/* Sense command		*/
	u_char		tag;		/* Tag for this transfer	*/
					/*  255 means no tag		*/
	u_char		target;
	u_char		lun;
	u_char		queued;
	u_char		auto_sense;
	struct ccb *	link_ccb;	/* Host adapter CCB chain	*/
	struct list_head link_ccbq;	/* Link to unit CCB queue	*/
	u32		startp;		/* Initial data pointer		*/
	u_long		magic;		/* Free / busy  CCB flag	*/
};

#define CCB_PHYS(cp,lbl)	(cp->p_ccb + offsetof(struct ccb, lbl))


/*========================================================================
**
**      Declaration of structs:     NCR device descriptor
**
**========================================================================
*/
struct ncb {
	/*----------------------------------------------------------------
	**	The global header.
	**	It is accessible to both the host and the script processor.
	**	Must be cache line size aligned (32 for x86) in order to 
	**	allow cache line bursting when it is copied to/from CCB.
	**----------------------------------------------------------------
	*/
	struct head     header;

	/*----------------------------------------------------------------
	**	CCBs management queues.
	**----------------------------------------------------------------
	*/
	struct scsi_cmnd	*waiting_list;	/* Commands waiting for a CCB	*/
					/*  when lcb is not allocated.	*/
	struct scsi_cmnd	*done_list;	/* Commands waiting for done()  */
					/* callback to be invoked.      */ 
	spinlock_t	smp_lock;	/* Lock for SMP threading       */

	/*----------------------------------------------------------------
	**	Chip and controller indentification.
	**----------------------------------------------------------------
	*/
	int		unit;		/* Unit number			*/
	char		inst_name[16];	/* ncb instance name		*/

	/*----------------------------------------------------------------
	**	Initial value of some IO register bits.
	**	These values are assumed to have been set by BIOS, and may 
	**	be used for probing adapter implementation differences.
	**----------------------------------------------------------------
	*/
	u_char	sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest0, sv_ctest3,
		sv_ctest4, sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4;

	/*----------------------------------------------------------------
	**	Actual initial value of IO register bits used by the 
	**	driver. They are loaded at initialisation according to  
	**	features that are to be enabled.
	**----------------------------------------------------------------
	*/
	u_char	rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest0, rv_ctest3,
		rv_ctest4, rv_ctest5, rv_stest2;

	/*----------------------------------------------------------------
	**	Targets management.
	**	During reselection the ncr jumps to jump_tcb.
	**	The SFBR register is loaded with the encoded target id.
	**	For i = 0 to 3
	**		SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(next tcb mod. i)
	**
	**	Recent chips will prefetch the 4 JUMPS using only 1 burst.
	**	It is kind of hashcoding.
	**----------------------------------------------------------------
	*/
	struct link     jump_tcb[4];	/* JUMPs for reselection	*/
	struct tcb  target[MAX_TARGET];	/* Target data			*/

	/*----------------------------------------------------------------
	**	Virtual and physical bus addresses of the chip.
	**----------------------------------------------------------------
	*/
	void __iomem *vaddr;		/* Virtual and bus address of	*/
	unsigned long	paddr;		/*  chip's IO registers.	*/
	unsigned long	paddr2;		/* On-chip RAM bus address.	*/
	volatile			/* Pointer to volatile for 	*/
	struct ncr_reg	__iomem *reg;	/*  memory mapped IO.		*/

	/*----------------------------------------------------------------
	**	SCRIPTS virtual and physical bus addresses.
	**	'script'  is loaded in the on-chip RAM if present.
	**	'scripth' stays in main memory.
	**----------------------------------------------------------------
	*/
	struct script	*script0;	/* Copies of script and scripth	*/
	struct scripth	*scripth0;	/*  relocated for this ncb.	*/
	struct scripth	*scripth;	/* Actual scripth virt. address	*/
	u_long		p_script;	/* Actual script and scripth	*/
	u_long		p_scripth;	/*  bus addresses.		*/

	/*----------------------------------------------------------------
	**	General controller parameters and configuration.
	**----------------------------------------------------------------
	*/
	struct device	*dev;
	u_char		revision_id;	/* PCI device revision id	*/
	u32		irq;		/* IRQ level			*/
	u32		features;	/* Chip features map		*/
	u_char		myaddr;		/* SCSI id of the adapter	*/
	u_char		maxburst;	/* log base 2 of dwords burst	*/
	u_char		maxwide;	/* Maximum transfer width	*/
	u_char		minsync;	/* Minimum sync period factor	*/
	u_char		maxsync;	/* Maximum sync period factor	*/
	u_char		maxoffs;	/* Max scsi offset		*/
	u_char		multiplier;	/* Clock multiplier (1,2,4)	*/
	u_char		clock_divn;	/* Number of clock divisors	*/
	u_long		clock_khz;	/* SCSI clock frequency in KHz	*/

	/*----------------------------------------------------------------
	**	Start queue management.
	**	It is filled up by the host processor and accessed by the 
	**	SCRIPTS processor in order to start SCSI commands.
	**----------------------------------------------------------------
	*/
	u16		squeueput;	/* Next free slot of the queue	*/
	u16		actccbs;	/* Number of allocated CCBs	*/
	u16		queuedccbs;	/* Number of CCBs in start queue*/
	u16		queuedepth;	/* Start queue depth		*/

	/*----------------------------------------------------------------
	**	Timeout handler.
	**----------------------------------------------------------------
	*/
	struct timer_list timer;	/* Timer handler link header	*/
	u_long		lasttime;
	u_long		settle_time;	/* Resetting the SCSI BUS	*/

	/*----------------------------------------------------------------
	**	Debugging and profiling.
	**----------------------------------------------------------------
	*/
	struct ncr_reg	regdump;	/* Register dump		*/
	u_long		regtime;	/* Time it has been done	*/

	/*----------------------------------------------------------------
	**	Miscellaneous buffers accessed by the scripts-processor.
	**	They shall be DWORD aligned, because they may be read or 
	**	written with a SCR_COPY script command.
	**----------------------------------------------------------------
	*/
	u_char		msgout[8];	/* Buffer for MESSAGE OUT 	*/
	u_char		msgin [8];	/* Buffer for MESSAGE IN	*/
	u32		lastmsg;	/* Last SCSI message sent	*/
	u_char		scratch;	/* Scratch for SCSI receive	*/

	/*----------------------------------------------------------------
	**	Miscellaneous configuration and status parameters.
	**----------------------------------------------------------------
	*/
	u_char		disc;		/* Diconnection allowed		*/
	u_char		scsi_mode;	/* Current SCSI BUS mode	*/
	u_char		order;		/* Tag order to use		*/
	u_char		verbose;	/* Verbosity for this controller*/
	int		ncr_cache;	/* Used for cache test at init.	*/
	u_long		p_ncb;		/* BUS address of this NCB	*/

	/*----------------------------------------------------------------
	**	Command completion handling.
	**----------------------------------------------------------------
	*/
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
	struct ccb	*(ccb_done[MAX_DONE]);
	int		ccb_done_ic;
#endif
	/*----------------------------------------------------------------
	**	Fields that should be removed or changed.
	**----------------------------------------------------------------
	*/
	struct ccb	*ccb;		/* Global CCB			*/
	struct usrcmd	user;		/* Command from user		*/
	volatile u_char	release_stage;	/* Synchronisation stage on release  */
};

#define NCB_SCRIPT_PHYS(np,lbl)	 (np->p_script  + offsetof (struct script, lbl))
#define NCB_SCRIPTH_PHYS(np,lbl) (np->p_scripth + offsetof (struct scripth,lbl))

/*==========================================================
**
**
**      Script for NCR-Processor.
**
**	Use ncr_script_fill() to create the variable parts.
**	Use ncr_script_copy_and_bind() to make a copy and
**	bind to physical addresses.
**
**
**==========================================================
**
**	We have to know the offsets of all labels before
**	we reach them (for forward jumps).
**	Therefore we declare a struct here.
**	If you make changes inside the script,
**	DONT FORGET TO CHANGE THE LENGTHS HERE!
**
**----------------------------------------------------------
*/

/*
**	For HP Zalon/53c720 systems, the Zalon interface
**	between CPU and 53c720 does prefetches, which causes
**	problems with self modifying scripts.  The problem
**	is overcome by calling a dummy subroutine after each
**	modification, to force a refetch of the script on
**	return from the subroutine.
*/

#ifdef CONFIG_NCR53C8XX_PREFETCH
#define PREFETCH_FLUSH_CNT	2
#define PREFETCH_FLUSH		SCR_CALL, PADDRH (wait_dma),
#else
#define PREFETCH_FLUSH_CNT	0
#define PREFETCH_FLUSH
#endif

/*
**	Script fragments which are loaded into the on-chip RAM 
**	of 825A, 875 and 895 chips.
*/
struct script {
	ncrcmd	start		[  5];
	ncrcmd  startpos	[  1];
	ncrcmd	select		[  6];
	ncrcmd	select2		[  9 + PREFETCH_FLUSH_CNT];
	ncrcmd	loadpos		[  4];
	ncrcmd	send_ident	[  9];
	ncrcmd	prepare		[  6];
	ncrcmd	prepare2	[  7];
	ncrcmd  command		[  6];
	ncrcmd  dispatch	[ 32];
	ncrcmd  clrack		[  4];
	ncrcmd	no_data		[ 17];
	ncrcmd  status		[  8];
	ncrcmd  msg_in		[  2];
	ncrcmd  msg_in2		[ 16];
	ncrcmd  msg_bad		[  4];
	ncrcmd	setmsg		[  7];
	ncrcmd	cleanup		[  6];
	ncrcmd  complete	[  9];
	ncrcmd	cleanup_ok	[  8 + PREFETCH_FLUSH_CNT];
	ncrcmd	cleanup0	[  1];
#ifndef SCSI_NCR_CCB_DONE_SUPPORT
	ncrcmd	signal		[ 12];
#else
	ncrcmd	signal		[  9];
	ncrcmd	done_pos	[  1];
	ncrcmd	done_plug	[  2];
	ncrcmd	done_end	[  7];
#endif
	ncrcmd  save_dp		[  7];
	ncrcmd  restore_dp	[  5];
	ncrcmd  disconnect	[ 10];
	ncrcmd	msg_out		[  9];
	ncrcmd	msg_out_done	[  7];
	ncrcmd  idle		[  2];
	ncrcmd	reselect	[  8];
	ncrcmd	reselected	[  8];
	ncrcmd	resel_dsa	[  6 + PREFETCH_FLUSH_CNT];
	ncrcmd	loadpos1	[  4];
	ncrcmd  resel_lun	[  6];
	ncrcmd	resel_tag	[  6];
	ncrcmd	jump_to_nexus	[  4 + PREFETCH_FLUSH_CNT];
	ncrcmd	nexus_indirect	[  4];
	ncrcmd	resel_notag	[  4];
	ncrcmd  data_in		[MAX_SCATTERL * 4];
	ncrcmd  data_in2	[  4];
	ncrcmd  data_out	[MAX_SCATTERL * 4];
	ncrcmd  data_out2	[  4];
};

/*
**	Script fragments which stay in main memory for all chips.
*/
struct scripth {
	ncrcmd  tryloop		[MAX_START*2];
	ncrcmd  tryloop2	[  2];
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
	ncrcmd  done_queue	[MAX_DONE*5];
	ncrcmd  done_queue2	[  2];
#endif
	ncrcmd	select_no_atn	[  8];
	ncrcmd	cancel		[  4];
	ncrcmd	skip		[  9 + PREFETCH_FLUSH_CNT];
	ncrcmd	skip2		[ 19];
	ncrcmd	par_err_data_in	[  6];
	ncrcmd	par_err_other	[  4];
	ncrcmd	msg_reject	[  8];
	ncrcmd	msg_ign_residue	[ 24];
	ncrcmd  msg_extended	[ 10];
	ncrcmd  msg_ext_2	[ 10];
	ncrcmd	msg_wdtr	[ 14];
	ncrcmd	send_wdtr	[  7];
	ncrcmd  msg_ext_3	[ 10];
	ncrcmd	msg_sdtr	[ 14];
	ncrcmd	send_sdtr	[  7];
	ncrcmd	nego_bad_phase	[  4];
	ncrcmd	msg_out_abort	[ 10];
	ncrcmd  hdata_in	[MAX_SCATTERH * 4];
	ncrcmd  hdata_in2	[  2];
	ncrcmd  hdata_out	[MAX_SCATTERH * 4];
	ncrcmd  hdata_out2	[  2];
	ncrcmd	reset		[  4];
	ncrcmd	aborttag	[  4];
	ncrcmd	abort		[  2];
	ncrcmd	abort_resel	[ 20];
	ncrcmd	resend_ident	[  4];
	ncrcmd	clratn_go_on	[  3];
	ncrcmd	nxtdsp_go_on	[  1];
	ncrcmd	sdata_in	[  8];
	ncrcmd  data_io		[ 18];
	ncrcmd	bad_identify	[ 12];
	ncrcmd	bad_i_t_l	[  4];
	ncrcmd	bad_i_t_l_q	[  4];
	ncrcmd	bad_target	[  8];
	ncrcmd	bad_status	[  8];
	ncrcmd	start_ram	[  4 + PREFETCH_FLUSH_CNT];
	ncrcmd	start_ram0	[  4];
	ncrcmd	sto_restart	[  5];