ncr53c8xx.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

#define	XE_OK		(0)
#define	XE_EXTRA_DATA	(1)	/* unexpected data phase */
#define	XE_BAD_PHASE	(2)	/* illegal phase (4/5)   */

/*==========================================================
**
**	Negotiation status.
**	nego_status field	of struct ccb.
**
**==========================================================
*/

#define NS_NOCHANGE	(0)
#define NS_SYNC		(1)
#define NS_WIDE		(2)
#define NS_PPR		(4)

/*==========================================================
**
**	"Special features" of targets.
**	quirks field		of struct tcb.
**	actualquirks field	of struct ccb.
**
**==========================================================
*/

#define	QUIRK_AUTOSAVE	(0x01)
#define	QUIRK_NOMSG	(0x02)
#define QUIRK_NOSYNC	(0x10)
#define QUIRK_NOWIDE16	(0x20)

/*==========================================================
**
**	Capability bits in Inquire response byte 7.
**
**==========================================================
*/

#define	INQ7_QUEUE	(0x02)
#define	INQ7_SYNC	(0x10)
#define	INQ7_WIDE16	(0x20)

/*==========================================================
**
**	Misc.
**
**==========================================================
*/

#define CCB_MAGIC	(0xf2691ad2)

/*==========================================================
**
**	Declaration of structs.
**
**==========================================================
*/

struct tcb;
struct lcb;
struct ccb;
struct ncb;
struct script;

typedef struct ncb * ncb_p;
typedef struct tcb * tcb_p;
typedef struct lcb * lcb_p;
typedef struct ccb * ccb_p;

struct link {
	ncrcmd	l_cmd;
	ncrcmd	l_paddr;
};

struct	usrcmd {
	u_long	target;
	u_long	lun;
	u_long	data;
	u_long	cmd;
};

#define UC_SETSYNC      10
#define UC_SETTAGS	11
#define UC_SETDEBUG	12
#define UC_SETORDER	13
#define UC_SETWIDE	14
#define UC_SETFLAG	15
#define UC_CLEARPROF	16
#define UC_SETVERBOSE	17

#define	UF_TRACE	(0x01)
#define	UF_NODISC	(0x02)
#define	UF_NOSCAN	(0x04)

/*---------------------------------------
**
**	Timestamps for profiling
**
**---------------------------------------
*/

#ifdef SCSI_NCR_PROFILE_SUPPORT

struct tstamp {
	u_long start;
	u_long end;
	u_long command;
	u_long status;
	u_long disconnect;
	u_long reselect;
};

/*
**	profiling data (per device)
*/

struct profile {
	u_long	num_trans;
	u_long	num_kbytes;
	u_long	rest_bytes;
	u_long	num_disc;
	u_long	num_break;
	u_long	num_int;
	u_long	num_fly;
	u_long	ms_setup;
	u_long	ms_data;
	u_long	ms_disc;
	u_long	ms_post;
};
#endif

/*========================================================================
**
**	Declaration of structs:		target control block
**
**========================================================================
*/
struct tcb {
	/*----------------------------------------------------------------
	**	During reselection the ncr jumps to this point with SFBR 
	**	set to the encoded target number with bit 7 set.
	**	if it's not this target, jump to the next.
	**
	**	JUMP  IF (SFBR != #target#), @(next tcb)
	**----------------------------------------------------------------
	*/
	struct link   jump_tcb;

	/*----------------------------------------------------------------
	**	Load the actual values for the sxfer and the scntl3
	**	register (sync/wide mode).
	**
	**	SCR_COPY (1), @(sval field of this tcb), @(sxfer  register)
	**	SCR_COPY (1), @(wval field of this tcb), @(scntl3 register)
	**----------------------------------------------------------------
	*/
	ncrcmd	getscr[6];

	/*----------------------------------------------------------------
	**	Get the IDENTIFY message and load the LUN to SFBR.
	**
	**	CALL, <RESEL_LUN>
	**----------------------------------------------------------------
	*/
	struct link   call_lun;

	/*----------------------------------------------------------------
	**	Now look for the right lun.
	**
	**	For i = 0 to 3
	**		SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(first lcb mod. i)
	**
	**	Recent chips will prefetch the 4 JUMPS using only 1 burst.
	**	It is kind of hashcoding.
	**----------------------------------------------------------------
	*/
	struct link     jump_lcb[4];	/* JUMPs for reselection	*/
	lcb_p		lp[MAX_LUN];	/* The lcb's of this tcb	*/
	u_char		inq_done;	/* Target capabilities received	*/
	u_char		inq_byte7;	/* Contains these capabilities	*/

	/*----------------------------------------------------------------
	**	Pointer to the ccb used for negotiation.
	**	Prevent from starting a negotiation for all queued commands 
	**	when tagged command queuing is enabled.
	**----------------------------------------------------------------
	*/
	ccb_p   nego_cp;

	/*----------------------------------------------------------------
	**	statistical data
	**----------------------------------------------------------------
	*/
	u_long	transfers;
	u_long	bytes;

	/*----------------------------------------------------------------
	**	negotiation of wide and synch transfer and device quirks.
	**----------------------------------------------------------------
	*/
/*0*/	u_char	minsync;
/*1*/	u_char	sval;
/*2*/	u_short	period;
/*0*/	u_char	maxoffs;
/*1*/	u_char	quirks;
/*2*/	u_char	widedone;
/*3*/	u_char	wval;

#ifdef SCSI_NCR_INTEGRITY_CHECKING
	u_char 	ic_min_sync;
	u_char 	ic_max_width;
	u_char 	ic_maximums_set;
	u_char 	ic_done;
#endif

	/*----------------------------------------------------------------
	**	User settable limits and options.
	**	These limits are read from the NVRAM if present.
	**----------------------------------------------------------------
	*/
	u_char	usrsync;
	u_char	usrwide;
	u_char	usrtags;
	u_char	usrflag;
};

/*========================================================================
**
**	Declaration of structs:		lun control block
**
**========================================================================
*/
struct lcb {
	/*----------------------------------------------------------------
	**	During reselection the ncr jumps to this point
	**	with SFBR set to the "Identify" message.
	**	if it's not this lun, jump to the next.
	**
	**	JUMP  IF (SFBR != #lun#), @(next lcb of this target)
	**
	**	It is this lun. Load TEMP with the nexus jumps table 
	**	address and jump to RESEL_TAG (or RESEL_NOTAG).
	**
	**		SCR_COPY (4), p_jump_ccb, TEMP,
	**		SCR_JUMP, <RESEL_TAG>
	**----------------------------------------------------------------
	*/
	struct link	jump_lcb;
	ncrcmd		load_jump_ccb[3];
	struct link	jump_tag;
	ncrcmd		p_jump_ccb;	/* Jump table bus address	*/

	/*----------------------------------------------------------------
	**	Jump table used by the script processor to directly jump 
	**	to the CCB corresponding to the reselected nexus.
	**	Address is allocated on 256 bytes boundary in order to 
	**	allow 8 bit calculation of the tag jump entry for up to 
	**	64 possible tags.
	**----------------------------------------------------------------
	*/
	u_int32		jump_ccb_0;	/* Default table if no tags	*/
	u_int32		*jump_ccb;	/* Virtual address		*/

	/*----------------------------------------------------------------
	**	CCB queue management.
	**----------------------------------------------------------------
	*/
	XPT_QUEHEAD	free_ccbq;	/* Queue of available CCBs	*/
	XPT_QUEHEAD	busy_ccbq;	/* Queue of busy CCBs		*/
	XPT_QUEHEAD	wait_ccbq;	/* Queue of waiting for IO CCBs	*/
	XPT_QUEHEAD	skip_ccbq;	/* Queue of skipped CCBs	*/
	u_char		actccbs;	/* Number of allocated CCBs	*/
	u_char		busyccbs;	/* CCBs busy for this lun	*/
	u_char		queuedccbs;	/* CCBs queued to the controller*/
	u_char		queuedepth;	/* Queue depth for this lun	*/
	u_char		scdev_depth;	/* SCSI device queue depth	*/
	u_char		maxnxs;		/* Max possible nexuses		*/

	/*----------------------------------------------------------------
	**	Control of tagged command queuing.
	**	Tags allocation is performed using a circular buffer.
	**	This avoids using a loop for tag allocation.
	**----------------------------------------------------------------
	*/
	u_char		ia_tag;		/* Allocation index		*/
	u_char		if_tag;		/* Freeing index		*/
	u_char cb_tags[MAX_TAGS];	/* Circular tags buffer	*/
	u_char		usetags;	/* Command queuing is active	*/
	u_char		maxtags;	/* Max nr of tags asked by user	*/
	u_char		numtags;	/* Current number of tags	*/
	u_char		inq_byte7;	/* Store unit CmdQ capabitility	*/

	/*----------------------------------------------------------------
	**	QUEUE FULL control and ORDERED tag control.
	**----------------------------------------------------------------
	*/
	/*----------------------------------------------------------------
	**	QUEUE FULL and ORDERED tag control.
	**----------------------------------------------------------------
	*/
	u_short		num_good;	/* Nr of GOOD since QUEUE FULL	*/
	tagmap_t	tags_umap;	/* Used tags bitmap		*/
	tagmap_t	tags_smap;	/* Tags in use at 'tag_stime'	*/
	u_long		tags_stime;	/* Last time we set smap=umap	*/
	ccb_p		held_ccb;	/* CCB held for QUEUE FULL	*/
};

/*========================================================================
**
**      Declaration of structs:     the launch script.
**
**========================================================================
**
**	It is part of the CCB and is called by the scripts processor to 
**	start or restart the data structure (nexus).
**	This 6 DWORDs mini script makes use of prefetching.
**
**------------------------------------------------------------------------
*/
struct launch {
	/*----------------------------------------------------------------
	**	SCR_COPY(4),	@(p_phys), @(dsa register)
	**	SCR_JUMP,	@(scheduler_point)
	**----------------------------------------------------------------
	*/
	ncrcmd		setup_dsa[3];	/* Copy 'phys' address to dsa	*/
	struct link	schedule;	/* Jump to scheduler point	*/
	ncrcmd		p_phys;		/* 'phys' header bus address	*/
};

/*========================================================================
**
**      Declaration of structs:     global HEADER.
**
**========================================================================
**
**	This substructure is copied from the ccb to a global address after 
**	selection (or reselection) and copied back before disconnect.
**
**	These fields are accessible to the script processor.
**
**------------------------------------------------------------------------
*/

struct head {
	/*----------------------------------------------------------------
	**	Saved data pointer.
	**	Points to the position in the script responsible for the
	**	actual transfer transfer of data.
	**	It's written after reception of a SAVE_DATA_POINTER message.
	**	The goalpointer points after the last transfer command.
	**----------------------------------------------------------------
	*/
	u_int32		savep;
	u_int32		lastp;
	u_int32		goalp;

	/*----------------------------------------------------------------
	**	Alternate data pointer.
	**	They are copied back to savep/lastp/goalp by the SCRIPTS 
	**	when the direction is unknown and the device claims data out.
	**----------------------------------------------------------------
	*/
	u_int32		wlastp;
	u_int32		wgoalp;

	/*----------------------------------------------------------------
	**	The virtual address of the ccb containing this header.
	**----------------------------------------------------------------
	*/
	ccb_p	cp;

#ifdef SCSI_NCR_PROFILE_SUPPORT
	/*----------------------------------------------------------------
	**	Space for some timestamps to gather profiling data.
	**----------------------------------------------------------------
	*/
	struct tstamp	stamp;
#endif

	/*----------------------------------------------------------------
	**	Status fields.
	**----------------------------------------------------------------
	*/
	u_char		scr_st[4];	/* script status		*/
	u_char		status[4];	/* host status. must be the 	*/
					/*  last DWORD of the header.	*/
};

/*
**	The status bytes are used by the host and the script processor.
**
**	The byte corresponding to the host_status must be stored in the 
**	last DWORD of the CCB header since it is used for command 
**	completion (ncr_wakeup()). Doing so, we are sure that the header 
**	has been entirely copied back to the CCB when the host_status is 
**	seen complete by the CPU.
**
**	The last four bytes (status[4]) are copied to the scratchb register
**	(declared as scr0..scr3 in ncr_reg.h) just after the select/reselect,
**	and copied back just after disconnecting.
**	Inside the script the XX_REG are used.
**
**	The first four bytes (scr_st[4]) are used inside the script by 
**	"COPY" commands.
**	Because source and destination must have the same alignment
**	in a DWORD, the fields HAVE to be at the choosen offsets.
**		xerr_st		0	(0x34)	scratcha
**		sync_st		1	(0x05)	sxfer
**		wide_st		3	(0x03)	scntl3
*/

/*
**	Last four bytes (script)
*/
#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)
*/
#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]

/*
**	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-changable data and
**	data blocks for the indirect move commands.
**
**----------------------------------------------------------
*/

struct dsb {

	/*
	**	Header.