ncr.c

国产CPU－龙芯（loongson)BIOS源代码

	struct timeval	reselect;
};

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

struct profile {
	u_long	num_trans;
	u_long	num_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;
};

/*==========================================================
**
**	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];

	/*
	**	if next message is "identify"
	**	then load the message to SFBR,
	**	else load 0 to SFBR.
	**
	**	CALL
	**	<RESEL_LUN>
	*/

	struct link   call_lun;

	/*
	**	now look for the right lun.
	**
	**	JUMP
	**	@(first ccb of this lun)
	*/

	struct link   jump_lcb;

	/*
	**	pointer to interrupted getcc ccb
	*/

	ccb_p   hold_cp;

	/*
	**	pointer to ccb used for negotiating.
	**	Avoid to start a nego for all queued commands
	**	when tagged command queuing is enabled.
	*/

	ccb_p   nego_cp;

	/*
	**	statistical data
	*/

	u_long	transfers;
	u_long	bytes;

	/*
	**	user settable limits for sync transfer
	**	and tagged commands.
	*/

	u_char	usrsync;
	u_char	usrtags;
	u_char	usrwide;
	u_char	usrflag;

	/*
	**	negotiation of wide and synch transfer.
	**	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;
	/*
	**	inquire data
	*/
#define MAX_INQUIRE 36
	u_char	inqdata[MAX_INQUIRE];

	/*
	**	the lcb's of this tcb
	*/

	lcb_p   lp[MAX_LUN];
};

/*==========================================================
**
**	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)
	*/

	struct link	jump_lcb;

	/*
	**	if next message is "simple tag",
	**	then load the tag to SFBR,
	**	else load 0 to SFBR.
	**
	**	CALL
	**	<RESEL_TAG>
	*/

	struct link	call_tag;

	/*
	**	now look for the right ccb.
	**
	**	JUMP
	**	@(first ccb of this lun)
	*/

	struct link	jump_ccb;

	/*
	**	start of the ccb chain
	*/

	ccb_p	next_ccb;

	/*
	**	Control of tagged queueing
	*/

	u_char		reqccbs;
	u_char		actccbs;
	u_char		reqlink;
	u_char		actlink;
	u_char		usetags;
	u_char		lasttag;
};

/*==========================================================
**
**      Declaration of structs:     COMMAND control block
**
**==========================================================
**
**	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 {
	/*
	**	Execution of a ccb starts at this point.
	**	It's a jump to the "SELECT" label
	**	of the script.
	**
	**	After successful selection the script
	**	processor overwrites it with a jump to
	**	the IDLE label of the script.
	*/

	struct link	launch;

	/*
	**	Saved data pointer.
	**	Points to the position in the script
	**	responsible for the actual transfer
	**	of data.
	**	It's written after reception of a
	**	"SAVE_DATA_POINTER" message.
	**	The goalpointer points after
	**	the last transfer command.
	*/

	u_int32_t	savep;
	u_int32_t	lastp;
	u_int32_t	goalp;

	/*
	**	The virtual address of the ccb
	**	containing this header.
	*/

	ccb_p	cp;

	/*
	**	space for some timestamps to gather
	**	profiling data about devices and this driver.
	*/

	struct tstamp	stamp;

	/*
	**	status fields.
	*/

	u_char		status[8];
};

/*
**	The status bytes are used by the host and the script processor.
**
**	The first four byte are copied to the scratchb register
**	(declared as scr0..scr3 in ncrreg.h) just after the select/reselect,
**	and copied back just after disconnecting.
**	Inside the script the XX_REG are used.
**
**	The last four bytes are used inside the script by "COPY" commands.
**	Because source and destination must have the same alignment
**	in a longword, the fields HAVE to be at the choosen offsets.
**		xerr_st	(4)	0	(0x34)	scratcha
**		sync_st	(5)	1	(0x05)	sxfer
**		wide_st	(7)	3	(0x03)	scntl3
*/

/*
**	First four bytes (script)
*/
#define  QU_REG	scr0
#define  HS_REG	scr1
#define  HS_PRT	nc_scr1
#define  SS_REG	scr2
#define  PS_REG	scr3

/*
**	First 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]

/*
**	Last four bytes (script)
*/
#define  xerr_st       header.status[4]	/* MUST be ==0 mod 4 */
#define  sync_st       header.status[5]	/* MUST be ==1 mod 4 */
#define  nego_st       header.status[6]
#define  wide_st       header.status[7]	/* MUST be ==3 mod 4 */

/*
**	Last four bytes (host)
*/
#define  xerr_status   phys.xerr_st
#define  sync_status   phys.sync_st
#define  nego_status   phys.nego_st
#define  wide_status   phys.wide_st

/*==========================================================
**
**      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.
	**	Has to be the first entry,
	**	because it's jumped to by the
	**	script processor
	*/

	struct head	header;

	/*
	**	Table data for Script
	*/

	struct scr_tblsel  select;
	struct scr_tblmove smsg  ;
	struct scr_tblmove smsg2 ;
	struct scr_tblmove cmd   ;
	struct scr_tblmove scmd  ;
	struct scr_tblmove sense ;
	struct scr_tblmove data [MAX_SCATTER];
};

/*==========================================================
**
**      Declaration of structs:     Command control 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 then
**	data blocks for the indirect move commands.
**
**----------------------------------------------------------
*/


struct ccb {
	/*
	**	This filler ensures that the global header is
	**	cache line size aligned.
	*/
	ncrcmd	filler[4];

	/*
	**	during reselection the ncr jumps to this point.
	**	If a "SIMPLE_TAG" message was received,
	**	then SFBR is set to the tag.
	**	else SFBR is set to 0
	**	If looking for another tag, jump to the next ccb.
	**
	**	JUMP  IF (SFBR != #TAG#)
	**	@(next ccb of this lun)
	*/

	struct link		jump_ccb;

	/*
	**	After execution of this call, the return address
	**	(in  the TEMP register) points to the following
	**	data structure block.
	**	So copy it to the DSA register, and start
	**	processing of this data structure.
	**
	**	CALL
	**	<RESEL_TMP>
	*/

	struct link		call_tmp;

	/*
	**	This is the data structure which is
	**	to be executed by the script processor.
	*/

	struct dsb		phys;

	/*
	**	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_xfer	*xfer;

	/*
	**	We prepare a message to be sent after selection,
	**	and a second one to be sent after getcc selection.
	**      Contents are IDENTIFY and SIMPLE_TAG.
	**	While negotiating sync or wide transfer,
	**	a SDTM or WDTM message is appended.
	*/

	u_char			scsi_smsg [8];
	u_char			scsi_smsg2[8];
#if defined(__mips__)
	u_char			local_sense[sizeof(struct scsi_sense_data)];
#endif

	/*
	**	Lock this ccb.
	**	Flag is used while looking for a free ccb.
	*/

	u_long		magic;

	/*
	**	Physical address of this instance of ccb
	*/

	u_long		p_ccb;

	/*
	**	Completion time out for this job.
	**	It's set to time of start + allowed number of seconds.
	*/

	u_long		tlimit;

	/*
	**	All ccbs of one hostadapter are chained.
	*/

	ccb_p		link_ccb;

	/*
	**	All ccbs of one target/lun are chained.
	*/

	ccb_p		next_ccb;

	/*
	**	Sense command
	*/

	u_char		sensecmd[6];

	/*
	**	Tag for this transfer.
	**	It's patched into jump_ccb.
	**	If it's not zero, a SIMPLE_TAG
	**	message is included in smsg.
	*/

	u_char			tag;
};

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

/*==========================================================
**
**      Declaration of structs:     NCR device descriptor
**
**==========================================================
*/

struct ncb {
#ifndef __OpenBSD__
	/*
	**	The global header.
	**	Accessible to both the host and the
	**	script-processor.
	**	We assume it is cache line size aligned.
	*/
	struct head     header;
#endif

#ifdef __OpenBSD__
	struct device sc_dev;
	pci_chipset_tag_t sc_pc;
	void *sc_ih;
	bus_space_tag_t sc_st;
	bus_space_handle_t sc_sh;
	int sc_iomapped;
#else /* !__OpenBSD__ */
	int	unit;
#endif /* __OpenBSD__ */

	/*-----------------------------------------------
	**	Scripts ..
	**-----------------------------------------------
	**
	**	During reselection the ncr jumps to this point.
	**	The SFBR register is loaded with the encoded target id.
	**
	**	Jump to the first target.
	**
	**	JUMP
	**	@(next tcb)
	*/
	struct link     jump_tcb;

	/*-----------------------------------------------
	**	Configuration ..
	**-----------------------------------------------
	**
	**	virtual and physical addresses
	**	of the 53c810 chip.
	*/
#ifdef __OpenBSD__
	bus_addr_t	paddr;

	bus_space_tag_t ram_tag;
	bus_space_handle_t ram_handle;
	bus_addr_t	paddr2;
	int		scriptmapped;
#else
	vm_offset_t     vaddr;
	vm_offset_t     paddr;

	vm_offset_t     vaddr2;
	vm_offset_t     paddr2;

	/*
	**	pointer to the chip's registers.
	*/
	volatile
	struct ncr_reg* reg;
#endif

	/*
	**	Scripts instance virtual address.
	*/
	struct script	*script;
	struct scripth	*scripth;

	/*
	**	Scripts instance physical address.
	*/
	u_long		p_script;
	u_long		p_scripth;

	/*
	**	The SCSI address of the host adapter.
	*/
	u_char		myaddr;

	/*
	**	timing parameters
	*/
	u_char		minsync;	/* Minimum sync period factor	*/
	u_char		maxsync;	/* Maximum sync period factor	*/
	u_char		maxoffs;	/* Max scsi offset		*/
	u_char		clock_divn;	/* Number of clock divisors	*/
	u_long		clock_khz;	/* SCSI clock frequency in KHz	*/
	u_long		features;	/* Chip features map		*/
	u_char		multiplier;	/* Clock multiplier (1,2,4)	*/

	u_char		maxburst;	/* log base 2 of dwords burst	*/

	/*
	**	BIOS supplied PCI bus options
	*/
	u_char		rv_scntl3;
	u_char		rv_dcntl;
	u_char		rv_dmode;
	u_char		rv_ctest3;
	u_char		rv_ctest4;
	u_char		rv_ctest5;
	u_char		rv_gpcntl;