53c7,8xx.h

基于组件方式开发操作系统的OSKIT源代码

struct NCR53c7x0_hostdata {
    int size;				/* Size of entire Scsi_Host
					   structure */
    int board;				/* set to board type, useful if 
					   we have host specific things,
					   ie, a general purpose I/O 
					   bit is being used to enable
					   termination, etc. */

    int chip;				/* set to chip type; 700-66 is
					   700-66, rest are last three
					   digits of part number */
    /*
     * PCI bus, device, function, only for NCR53c8x0 chips.
     * pci_valid indicates that the PCI configuration information
     * is valid, and we can twiddle MAX_LAT, etc. as recommended
     * for maximum performance in the NCR documentation.
     */
    unsigned char pci_bus, pci_device_fn;
    unsigned pci_valid:1;

    u32 *dsp;				/* dsp to restart with after
					   all stacked interrupts are
					   handled. */

    unsigned dsp_changed:1;		/* Has dsp changed within this
					   set of stacked interrupts ? */

    unsigned char dstat;		/* Most recent value of dstat */
    unsigned dstat_valid:1;

    unsigned expecting_iid:1;		/* Expect IID interrupt */
    unsigned expecting_sto:1;		/* Expect STO interrupt */
    
    /* 
     * The code stays cleaner if we use variables with function
     * pointers and offsets that are unique for the different
     * scripts rather than having a slew of switch(hostdata->chip) 
     * statements.
     * 
     * It also means that the #defines from the SCSI SCRIPTS(tm)
     * don't have to be visible outside of the script-specific
     * instructions, preventing name space pollution.
     */

    void (* init_fixup)(struct Scsi_Host *host);
    void (* init_save_regs)(struct Scsi_Host *host);
    void (* dsa_fixup)(struct NCR53c7x0_cmd *cmd);
    void (* soft_reset)(struct Scsi_Host *host);
    int (* run_tests)(struct Scsi_Host *host);

    /*
     * Called when DSTAT_SIR is set, indicating an interrupt generated
     * by the INT instruction, where values are unique for each SCSI
     * script.  Should return one of the SPEC_* values.
     */

    int (* dstat_sir_intr)(struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd);

    int dsa_len; /* Size of DSA structure */

    /*
     * Location of DSA fields for the SCSI SCRIPT corresponding to this 
     * chip.  
     */

    s32 dsa_start;			
    s32 dsa_end;			
    s32 dsa_next;
    s32 dsa_prev;
    s32 dsa_cmnd;
    s32 dsa_select;
    s32 dsa_msgout;
    s32 dsa_cmdout;
    s32 dsa_dataout;
    s32 dsa_datain;
    s32 dsa_msgin;
    s32 dsa_msgout_other;
    s32 dsa_write_sync;
    s32 dsa_write_resume;
    s32 dsa_check_reselect;
    s32 dsa_status;
    s32 dsa_saved_pointer;
    s32 dsa_jump_dest;

    /* 
     * Important entry points that generic fixup code needs
     * to know about, fixed up.
     */

    s32 E_accept_message;
    s32 E_command_complete;		
    s32 E_data_transfer;
    s32 E_dsa_code_template;
    s32 E_dsa_code_template_end;
    s32 E_end_data_transfer;
    s32 E_msg_in;
    s32 E_initiator_abort;
    s32 E_other_transfer;
    s32 E_other_in;
    s32 E_other_out;
    s32 E_target_abort;
    s32 E_debug_break;	
    s32 E_reject_message;
    s32 E_respond_message;
    s32 E_select;
    s32 E_select_msgout;
    s32 E_test_0;
    s32 E_test_1;
    s32 E_test_2;
    s32 E_test_3;
    s32 E_dsa_zero;
    s32 E_cmdout_cmdout;
    s32 E_wait_reselect;
    s32 E_dsa_code_begin;

    long long options;			/* Bitfielded set of options enabled */
    volatile u32 test_completed;	/* Test completed */
    int test_running;			/* Test currently running */
    s32 test_source;
    volatile s32 test_dest;

    volatile int state;			/* state of driver, only used for 
					   OPTION_700 */

    unsigned char  dmode;		/* 
					 * set to the address of the DMODE 
					 * register for this chip.
					 */
    unsigned char istat;		/* 
    	    	    	    	    	 * set to the address of the ISTAT 
    	    	    	    	    	 * register for this chip.
    	    	    	    	    	 */
  
    int scsi_clock;			/* 
					 * SCSI clock in HZ. 0 may be used 
					 * for unknown, although this will
					 * disable synchronous negotiation.
					 */

    volatile int intrs;			/* Number of interrupts */
    volatile int resets;		/* Number of SCSI resets */
    unsigned char saved_dmode;	
    unsigned char saved_ctest4;
    unsigned char saved_ctest7;
    unsigned char saved_dcntl;
    unsigned char saved_scntl3;

    unsigned char this_id_mask;

    /* Debugger information */
    struct NCR53c7x0_break *breakpoints, /* Linked list of all break points */
	*breakpoint_current;		/* Current breakpoint being stepped 
					   through, NULL if we are running 
					   normally. */
#ifdef NCR_DEBUG
    int debug_size;			/* Size of debug buffer */
    volatile int debug_count;		/* Current data count */
    volatile char *debug_buf;		/* Output ring buffer */
    volatile char *debug_write;		/* Current write pointer */
    volatile char *debug_read;		/* Current read pointer */
#endif /* def NCR_DEBUG */

    /* XXX - primitive debugging junk, remove when working ? */
    int debug_print_limit;		/* Number of commands to print
					   out exhaustive debugging
					   information for if 
					   OPTION_DEBUG_DUMP is set */ 

    unsigned char debug_lun_limit[16];	/* If OPTION_DEBUG_TARGET_LIMIT
					   set, puke if commands are sent
					   to other target/lun combinations */

    int debug_count_limit;		/* Number of commands to execute
					   before puking to limit debugging 
					   output */
				    

    volatile unsigned idle:1;			/* set to 1 if idle */

    /* 
     * Table of synchronous+wide transfer parameters set on a per-target
     * basis.
     */
    
    volatile struct NCR53c7x0_synchronous sync[16];

    volatile Scsi_Cmnd *issue_queue;
						/* waiting to be issued by
						   Linux driver */
    volatile struct NCR53c7x0_cmd *running_list;	
						/* commands running, maintained
						   by Linux driver */

    volatile struct NCR53c7x0_cmd *curr;	/* currently connected 
						   nexus, ONLY valid for
						   NCR53c700/NCR53c700-66
						 */

    volatile struct NCR53c7x0_cmd *spare;	/* pointer to spare,
    	    	    	    	    	    	   allocated at probe time,
    	    	    	    	    	    	   which we can use for 
						   initialization */
    volatile struct NCR53c7x0_cmd *free;
    int max_cmd_size;				/* Maximum size of NCR53c7x0_cmd
					    	   based on number of 
						   scatter/gather segments, etc.
						   */
    volatile int num_cmds;			/* Number of commands 
						   allocated */
    volatile int extra_allocate;
    volatile unsigned char cmd_allocated[16];	/* Have we allocated commands
						   for this target yet?  If not,
						   do so ASAP */
    volatile unsigned char busy[16][8];     	/* number of commands 
						   executing on each target
    	    	    	    	    	    	 */
    /* 
     * Eventually, I'll switch to a coroutine for calling 
     * cmd->done(cmd), etc. so that we can overlap interrupt
     * processing with this code for maximum performance.
     */
    
    volatile struct NCR53c7x0_cmd *finished_queue;	
						

    /* Shared variables between SCRIPT and host driver */
    volatile u32 *schedule;			/* Array of JUMPs to dsa_begin
						   routines of various DSAs.  
						   When not in use, replace
						   with jump to next slot */


    volatile unsigned char msg_buf[16];		/* buffer for messages
						   other than the command
						   complete message */

    /* Per-target default synchronous and WIDE messages */
    volatile unsigned char synchronous_want[16][5];
    volatile unsigned char wide_want[16][4];

    /* Bit fielded set of targets we want to speak synchronously with */ 
    volatile u16 initiate_sdtr;	
    /* Bit fielded set of targets we want to speak wide with */
    volatile u16 initiate_wdtr;
    /* Bit fielded list of targets we've talked to. */
    volatile u16 talked_to;

    /* Array of bit-fielded lun lists that we need to request_sense */
    volatile unsigned char request_sense[16];

    u32 addr_reconnect_dsa_head;		/* RISCy style constant,
						   address of following */
    volatile u32 reconnect_dsa_head;	
    /* Data identifying nexus we are trying to match during reselection */
    volatile unsigned char reselected_identify; /* IDENTIFY message */
    volatile unsigned char reselected_tag;	/* second byte of queue tag 
						   message or 0 */
    /* These were static variables before we moved them */

    s32 NCR53c7xx_zero;
    s32 NCR53c7xx_sink;
    u32 NOP_insn;
    char NCR53c7xx_msg_reject;
    char NCR53c7xx_msg_abort;
    char NCR53c7xx_msg_nop;

    volatile int event_size, event_index;
    volatile struct NCR53c7x0_event *events;

    /* If we need to generate code to kill off the currently connected 
       command, this is where we do it. Should have a BMI instruction
       to source or sink the current data, followed by a JUMP
       to abort_connected */

    u32 *abort_script;

    int script_count;				/* Size of script in words */
    u32 script[0];				/* Relocated SCSI script */

};

#define IRQ_NONE	255
#define DMA_NONE	255
#define IRQ_AUTO	254
#define DMA_AUTO	254

#define BOARD_GENERIC	0

#define NCR53c7x0_insn_size(insn)					\
    (((insn) & DCMD_TYPE_MASK) == DCMD_TYPE_MMI ? 3 : 2)
    

#define NCR53c7x0_local_declare()					\
    volatile unsigned char *NCR53c7x0_address_memory;			\
    unsigned int NCR53c7x0_address_io;					\
    int NCR53c7x0_memory_mapped

#define NCR53c7x0_local_setup(host)					\
    NCR53c7x0_address_memory = (void *) (host)->base;			\
    NCR53c7x0_address_io = (unsigned int) (host)->io_port;		\
    NCR53c7x0_memory_mapped = ((struct NCR53c7x0_hostdata *) 		\
	host->hostdata)-> options & OPTION_MEMORY_MAPPED 

#define NCR53c7x0_read8(address) 					\
    (NCR53c7x0_memory_mapped ? 						\
	(unsigned int)readb(NCR53c7x0_address_memory + (address)) :	\
	inb(NCR53c7x0_address_io + (address)))

#define NCR53c7x0_read16(address) 					\
    (NCR53c7x0_memory_mapped ? 						\
	(unsigned int)readw(NCR53c7x0_address_memory + (address)) :	\
	inw(NCR53c7x0_address_io + (address)))

#define NCR53c7x0_read32(address) 					\
    (NCR53c7x0_memory_mapped ? 						\
	(unsigned int) readl(NCR53c7x0_address_memory + (address)) : 	\
	inl(NCR53c7x0_address_io + (address)))

#define NCR53c7x0_write8(address,value) 				\
    (NCR53c7x0_memory_mapped ? 						\
     ({writeb((value), NCR53c7x0_address_memory + (address)); mb();}) :	\
	outb((value), NCR53c7x0_address_io + (address)))

#define NCR53c7x0_write16(address,value) 				\
    (NCR53c7x0_memory_mapped ? 						\
     ({writew((value), NCR53c7x0_address_memory + (address)); mb();}) :	\
	outw((value), NCR53c7x0_address_io + (address)))

#define NCR53c7x0_write32(address,value) 				\
    (NCR53c7x0_memory_mapped ? 						\
     ({writel((value), NCR53c7x0_address_memory + (address)); mb();}) :	\
	outl((value), NCR53c7x0_address_io + (address)))

/* Patch arbitrary 32 bit words in the script */
#define patch_abs_32(script, offset, symbol, value)			\
    	for (i = 0; i < (sizeof (A_##symbol##_used) / sizeof 		\
    	    (u32)); ++i) {					\
	    (script)[A_##symbol##_used[i] - (offset)] += (value);	\
	    if (hostdata->options & OPTION_DEBUG_FIXUP) 		\
	      printk("scsi%d : %s reference %d at 0x%x in %s is now 0x%x\n",\
		host->host_no, #symbol, i, A_##symbol##_used[i] - 	\
		(int)(offset), #script, (script)[A_##symbol##_used[i] -	\
		(offset)]);						\
    	}

/* Patch read/write instruction immediate field */
#define patch_abs_rwri_data(script, offset, symbol, value)		\
    	for (i = 0; i < (sizeof (A_##symbol##_used) / sizeof 		\
    	    (u32)); ++i)					\
    	    (script)[A_##symbol##_used[i] - (offset)] =			\
	    	((script)[A_##symbol##_used[i] - (offset)] & 		\
	    	~DBC_RWRI_IMMEDIATE_MASK) | 				\
    	    	(((value) << DBC_RWRI_IMMEDIATE_SHIFT) &		\
		 DBC_RWRI_IMMEDIATE_MASK)

/* Patch transfer control instruction data field */
#define patch_abs_tci_data(script, offset, symbol, value)	        \
    	for (i = 0; i < (sizeof (A_##symbol##_used) / sizeof 		\
    	    (u32)); ++i)					\
    	    (script)[A_##symbol##_used[i] - (offset)] =			\
	    	((script)[A_##symbol##_used[i] - (offset)] & 		\
	    	~DBC_TCI_DATA_MASK) | 					\
    	    	(((value) << DBC_TCI_DATA_SHIFT) &			\
		 DBC_TCI_DATA_MASK)

/* Patch field in dsa structure (assignment should be +=?) */
#define patch_dsa_32(dsa, symbol, word, value)				\
	{								\
	(dsa)[(hostdata->##symbol - hostdata->dsa_start) / sizeof(u32)	\
	    + (word)] = (value);					\
	if (hostdata->options & OPTION_DEBUG_DSA)			\
	    printk("scsi : dsa %s symbol %s(%d) word %d now 0x%x\n",	\
		#dsa, #symbol, hostdata->##symbol, 			\
		(word), (u32) le32_to_cpu(value));			\
	}

/* Paranoid people could use panic() here. */
#define FATAL(host) shutdown((host));

#endif /* NCR53c7x0_C */
#endif /* NCR53c7x0_H */