- pre4:

[davej-history.git] / drivers / scsi / 53c7xx.h

/*
 * 53c710 driver.  Modified from Drew Eckhardts driver
 * for 53c810 by Richard Hirst [richard@sleepie.demon.co.uk]
 *
 * I have left the code for the 53c8xx family in here, because it didn't
 * seem worth removing it.  The possibility of IO_MAPPED chips rather
 * than MEMORY_MAPPED remains, in case someone wants to add support for
 * 53c710 chips on Intel PCs (some older machines have them on the
 * motherboard).
 *
 * NOTE THERE MAY BE PROBLEMS WITH CASTS IN read8 AND Co.
 */

/*
 * NCR 53c{7,8}0x0 driver, header file
 *
 * Sponsored by
 *      iX Multiuser Multitasking Magazine
 *      Hannover, Germany
 *      hm@ix.de        
 *
 * Copyright 1993, 1994, 1995 Drew Eckhardt
 *      Visionary Computing 
 *      (Unix and Linux consulting and custom programming)
 *      drew@PoohSticks.ORG
 *      +1 (303) 786-7975
 *
 * TolerANT and SCSI SCRIPTS are registered trademarks of NCR Corporation.
 * 
 * PRE-ALPHA
 *
 * For more information, please consult 
 *
 * NCR 53C700/53C700-66
 * SCSI I/O Processor
 * Data Manual
 *
 * NCR 53C810
 * PCI-SCSI I/O Processor 
 * Data Manual
 *
 * NCR Microelectronics
 * 1635 Aeroplaza Drive
 * Colorado Springs, CO 80916
 * +1 (719) 578-3400
 *
 * Toll free literature number
 * +1 (800) 334-5454
 *
 */

#ifndef NCR53c710_H
#define NCR53c710_H
#include <linux/version.h>

/* 
 * Prevent name space pollution in hosts.c, and only provide the 
 * define we need to get the NCR53c7x0 driver into the host template
 * array.
 */

#if defined(HOSTS_C) || defined(MODULE)
#include <scsi/scsicam.h>

extern int NCR53c7xx_abort(Scsi_Cmnd *);
extern int NCR53c7xx_detect(Scsi_Host_Template *tpnt);
extern int NCR53c7xx_queue_command(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
extern int NCR53c7xx_reset(Scsi_Cmnd *, unsigned int);
#ifdef MODULE
extern int NCR53c7xx_release(struct Scsi_Host *);
#else
#define NCR53c7xx_release NULL
#endif

#define NCR53c7xx {NULL, NULL, NULL, NULL, \
        "NCR53c{7,8}xx (rel 17)", NCR53c7xx_detect,\
        NULL, /* info */ NULL, /* command, deprecated */ NULL,          \
        NCR53c7xx_queue_command, NCR53c7xx_abort, NCR53c7xx_reset,      \
        NULL /* slave attach */, scsicam_bios_param, /* can queue */ 24, \
        /* id */ 7, 127 /* old SG_ALL */, /* cmd per lun */ 3,          \
        /* present */ 0, /* unchecked isa dma */ 0, DISABLE_CLUSTERING} 

#endif /* defined(HOSTS_C) || defined(MODULE) */ 

#ifndef HOSTS_C

/* SCSI control 0 rw, default = 0xc0 */ 
#define SCNTL0_REG              0x00    
#define SCNTL0_ARB1             0x80    /* 0 0 = simple arbitration */
#define SCNTL0_ARB2             0x40    /* 1 1 = full arbitration */
#define SCNTL0_STRT             0x20    /* Start Sequence */
#define SCNTL0_WATN             0x10    /* Select with ATN */
#define SCNTL0_EPC              0x08    /* Enable parity checking */
/* Bit 2 is reserved on 800 series chips */
#define SCNTL0_EPG_700          0x04    /* Enable parity generation */
#define SCNTL0_AAP              0x02    /*  ATN/ on parity error */
#define SCNTL0_TRG              0x01    /* Target mode */

/* SCSI control 1 rw, default = 0x00 */

#define SCNTL1_REG              0x01    
#define SCNTL1_EXC              0x80    /* Extra Clock Cycle of Data setup */
#define SCNTL1_ADB              0x40    /*  contents of SODL on bus */
#define SCNTL1_ESR_700          0x20    /* Enable SIOP response to selection 
                                           and reselection */
#define SCNTL1_DHP_800          0x20    /* Disable halt on parity error or ATN
                                           target mode only */
#define SCNTL1_CON              0x10    /* Connected */
#define SCNTL1_RST              0x08    /* SCSI RST/ */
#define SCNTL1_AESP             0x04    /* Force bad parity */
#define SCNTL1_SND_700          0x02    /* Start SCSI send */
#define SCNTL1_IARB_800         0x02    /* Immediate Arbitration, start
                                           arbitration immediately after
                                           busfree is detected */
#define SCNTL1_RCV_700          0x01    /* Start SCSI receive */
#define SCNTL1_SST_800          0x01    /* Start SCSI transfer */

/* SCSI control 2 rw, */

#define SCNTL2_REG_800          0x02    
#define SCNTL2_800_SDU          0x80    /* SCSI disconnect unexpected */

/* SCSI control 3 rw */

#define SCNTL3_REG_800          0x03    
#define SCNTL3_800_SCF_SHIFT    4
#define SCNTL3_800_SCF_MASK     0x70
#define SCNTL3_800_SCF2         0x40    /* Synchronous divisor */
#define SCNTL3_800_SCF1         0x20    /* 0x00 = SCLK/3 */
#define SCNTL3_800_SCF0         0x10    /* 0x10 = SCLK/1 */
                                        /* 0x20 = SCLK/1.5 
                                           0x30 = SCLK/2 
                                           0x40 = SCLK/3 */
            
#define SCNTL3_800_CCF_SHIFT    0
#define SCNTL3_800_CCF_MASK     0x07
#define SCNTL3_800_CCF2         0x04    /* 0x00 50.01 to 66 */
#define SCNTL3_800_CCF1         0x02    /* 0x01 16.67 to 25 */
#define SCNTL3_800_CCF0         0x01    /* 0x02 25.01 - 37.5 
                                           0x03 37.51 - 50 
                                           0x04 50.01 - 66 */

/*  
 * SCSI destination ID rw - the appropriate bit is set for the selected
 * target ID.  This is written by the SCSI SCRIPTS processor.
 * default = 0x00
 */
#define SDID_REG_700            0x02    
#define SDID_REG_800            0x06

#define GP_REG_800              0x07    /* General purpose IO */
#define GP_800_IO1              0x02
#define GP_800_IO2              0x01

/* SCSI interrupt enable rw, default = 0x00 */
#define SIEN_REG_700            0x03    
#define SIEN0_REG_800           0x40
#define SIEN_MA                 0x80    /* Phase mismatch (ini) or ATN (tgt) */
#define SIEN_FC                 0x40    /* Function complete */
#define SIEN_700_STO            0x20    /* Selection or reselection timeout */
#define SIEN_800_SEL            0x20    /* Selected */
#define SIEN_700_SEL            0x10    /* Selected or reselected */
#define SIEN_800_RESEL          0x10    /* Reselected */
#define SIEN_SGE                0x08    /* SCSI gross error */
#define SIEN_UDC                0x04    /* Unexpected disconnect */
#define SIEN_RST                0x02    /* SCSI RST/ received */
#define SIEN_PAR                0x01    /* Parity error */

/* 
 * SCSI chip ID rw
 * NCR53c700 : 
 *      When arbitrating, the highest bit is used, when reselection or selection
 *      occurs, the chip responds to all IDs for which a bit is set.
 *      default = 0x00 
 * NCR53c810 : 
 *      Uses bit mapping
 */
#define SCID_REG                0x04    
/* Bit 7 is reserved on 800 series chips */
#define SCID_800_RRE            0x40    /* Enable response to reselection */
#define SCID_800_SRE            0x20    /* Enable response to selection */
/* Bits four and three are reserved on 800 series chips */
#define SCID_800_ENC_MASK       0x07    /* Encoded SCSI ID */

/* SCSI transfer rw, default = 0x00 */
#define SXFER_REG               0x05
#define SXFER_DHP               0x80    /* Disable halt on parity */

#define SXFER_TP2               0x40    /* Transfer period msb */
#define SXFER_TP1               0x20
#define SXFER_TP0               0x10    /* lsb */
#define SXFER_TP_MASK           0x70
/* FIXME : SXFER_TP_SHIFT == 5 is right for '8xx chips */
#define SXFER_TP_SHIFT          5
#define SXFER_TP_4              0x00    /* Divisors */
#define SXFER_TP_5              0x10<<1
#define SXFER_TP_6              0x20<<1
#define SXFER_TP_7              0x30<<1
#define SXFER_TP_8              0x40<<1
#define SXFER_TP_9              0x50<<1
#define SXFER_TP_10             0x60<<1
#define SXFER_TP_11             0x70<<1

#define SXFER_MO3               0x08    /* Max offset msb */
#define SXFER_MO2               0x04
#define SXFER_MO1               0x02
#define SXFER_MO0               0x01    /* lsb */
#define SXFER_MO_MASK           0x0f
#define SXFER_MO_SHIFT          0

/* 
 * SCSI output data latch rw
 * The contents of this register are driven onto the SCSI bus when 
 * the Assert Data Bus bit of the SCNTL1 register is set and 
 * the CD, IO, and MSG bits of the SOCL register match the SCSI phase
 */
#define SODL_REG_700            0x06    
#define SODL_REG_800            0x54


/* 
 * SCSI output control latch rw, default = 0 
 * Note that when the chip is being manually programmed as an initiator,
 * the MSG, CD, and IO bits must be set correctly for the phase the target
 * is driving the bus in.  Otherwise no data transfer will occur due to 
 * phase mismatch.
 */

#define SOCL_REG                0x07
#define SOCL_REQ                0x80    /*  REQ */
#define SOCL_ACK                0x40    /*  ACK */
#define SOCL_BSY                0x20    /*  BSY */
#define SOCL_SEL                0x10    /*  SEL */
#define SOCL_ATN                0x08    /*  ATN */
#define SOCL_MSG                0x04    /*  MSG */
#define SOCL_CD                 0x02    /*  C/D */
#define SOCL_IO                 0x01    /*  I/O */

/* 
 * SCSI first byte received latch ro 
 * This register contains the first byte received during a block MOVE 
 * SCSI SCRIPTS instruction, including
 * 
 * Initiator mode       Target mode
 * Message in           Command
 * Status               Message out
 * Data in              Data out
 *
 * It also contains the selecting or reselecting device's ID and our 
 * ID.
 *
 * Note that this is the register the various IF conditionals can 
 * operate on.
 */
#define SFBR_REG                0x08    

/* 
 * SCSI input data latch ro
 * In initiator mode, data is latched into this register on the rising
 * edge of REQ/. In target mode, data is latched on the rising edge of 
 * ACK/
 */
#define SIDL_REG_700            0x09
#define SIDL_REG_800            0x50

/* 
 * SCSI bus data lines ro 
 * This register reflects the instantaneous status of the SCSI data 
 * lines.  Note that SCNTL0 must be set to disable parity checking, 
 * otherwise reading this register will latch new parity.
 */
#define SBDL_REG_700            0x0a
#define SBDL_REG_800            0x58

#define SSID_REG_800            0x0a
#define SSID_800_VAL            0x80    /* Exactly two bits asserted at sel */
#define SSID_800_ENCID_MASK     0x07    /* Device which performed operation */


/* 
 * SCSI bus control lines rw, 
 * instantaneous readout of control lines 
 */
#define SBCL_REG                0x0b    
#define SBCL_REQ                0x80    /*  REQ ro */
#define SBCL_ACK                0x40    /*  ACK ro */
#define SBCL_BSY                0x20    /*  BSY ro */
#define SBCL_SEL                0x10    /*  SEL ro */
#define SBCL_ATN                0x08    /*  ATN ro */
#define SBCL_MSG                0x04    /*  MSG ro */
#define SBCL_CD                 0x02    /*  C/D ro */
#define SBCL_IO                 0x01    /*  I/O ro */
#define SBCL_PHASE_CMDOUT       SBCL_CD
#define SBCL_PHASE_DATAIN       SBCL_IO
#define SBCL_PHASE_DATAOUT      0
#define SBCL_PHASE_MSGIN        (SBCL_CD|SBCL_IO|SBCL_MSG)
#define SBCL_PHASE_MSGOUT       (SBCL_CD|SBCL_MSG)
#define SBCL_PHASE_STATIN       (SBCL_CD|SBCL_IO)
#define SBCL_PHASE_MASK         (SBCL_CD|SBCL_IO|SBCL_MSG)
/* 
 * Synchronous SCSI Clock Control bits 
 * 0 - set by DCNTL 
 * 1 - SCLK / 1.0
 * 2 - SCLK / 1.5
 * 3 - SCLK / 2.0 
 */
#define SBCL_SSCF1              0x02    /* wo, -66 only */
#define SBCL_SSCF0              0x01    /* wo, -66 only */
#define SBCL_SSCF_MASK          0x03

/* 
 * XXX note : when reading the DSTAT and STAT registers to clear interrupts,
 * insure that 10 clocks elapse between the two  
 */
/* DMA status ro */
#define DSTAT_REG               0x0c    
#define DSTAT_DFE               0x80    /* DMA FIFO empty */
#define DSTAT_800_MDPE          0x40    /* Master Data Parity Error */
#define DSTAT_800_BF            0x20    /* Bus Fault */
#define DSTAT_ABRT              0x10    /* Aborted - set on error */
#define DSTAT_SSI               0x08    /* SCRIPTS single step interrupt */
#define DSTAT_SIR               0x04    /* SCRIPTS interrupt received - 
                                           set when INT instruction is 
                                           executed */
#define DSTAT_WTD               0x02    /* Watchdog timeout detected */
#define DSTAT_OPC               0x01    /* Illegal instruction */
#define DSTAT_800_IID           0x01    /* Same thing, different name */


/* NCR53c800 moves this stuff into SIST0 */
#define SSTAT0_REG              0x0d    /* SCSI status 0 ro */
#define SIST0_REG_800           0x42    
#define SSTAT0_MA               0x80    /* ini : phase mismatch,
                                         * tgt : ATN/ asserted 
                                         */
#define SSTAT0_CMP              0x40    /* function complete */
#define SSTAT0_700_STO          0x20    /* Selection or reselection timeout */
#define SIST0_800_SEL           0x20    /* Selected */
#define SSTAT0_700_SEL          0x10    /* Selected or reselected */
#define SIST0_800_RSL           0x10    /* Reselected */
#define SSTAT0_SGE              0x08    /* SCSI gross error */
#define SSTAT0_UDC              0x04    /* Unexpected disconnect */
#define SSTAT0_RST              0x02    /* SCSI RST/ received */
#define SSTAT0_PAR              0x01    /* Parity error */

/* And uses SSTAT0 for what was SSTAT1 */

#define SSTAT1_REG              0x0e    /* SCSI status 1 ro */
#define SSTAT1_ILF              0x80    /* SIDL full */
#define SSTAT1_ORF              0x40    /* SODR full */
#define SSTAT1_OLF              0x20    /* SODL full */
#define SSTAT1_AIP              0x10    /* Arbitration in progress */
#define SSTAT1_LOA              0x08    /* Lost arbitration */
#define SSTAT1_WOA              0x04    /* Won arbitration */
#define SSTAT1_RST              0x02    /* Instant readout of RST/ */
#define SSTAT1_SDP              0x01    /* Instant readout of SDP/ */

#define SSTAT2_REG              0x0f    /* SCSI status 2 ro */
#define SSTAT2_FF3              0x80    /* number of bytes in synchronous */
#define SSTAT2_FF2              0x40    /* data FIFO */
#define SSTAT2_FF1              0x20    
#define SSTAT2_FF0              0x10
#define SSTAT2_FF_MASK          0xf0
#define SSTAT2_FF_SHIFT         4

/* 
 * Latched signals, latched on the leading edge of REQ/ for initiators,
 * ACK/ for targets.
 */
#define SSTAT2_SDP              0x08    /* SDP */
#define SSTAT2_MSG              0x04    /* MSG */
#define SSTAT2_CD               0x02    /* C/D */
#define SSTAT2_IO               0x01    /* I/O */
#define SSTAT2_PHASE_CMDOUT     SSTAT2_CD
#define SSTAT2_PHASE_DATAIN     SSTAT2_IO
#define SSTAT2_PHASE_DATAOUT    0
#define SSTAT2_PHASE_MSGIN      (SSTAT2_CD|SSTAT2_IO|SSTAT2_MSG)
#define SSTAT2_PHASE_MSGOUT     (SSTAT2_CD|SSTAT2_MSG)
#define SSTAT2_PHASE_STATIN     (SSTAT2_CD|SSTAT2_IO)
#define SSTAT2_PHASE_MASK       (SSTAT2_CD|SSTAT2_IO|SSTAT2_MSG)


/* NCR53c700-66 only */
#define SCRATCHA_REG_00         0x10    /* through  0x13 Scratch A rw */
/* NCR53c710 and higher */
#define DSA_REG                 0x10    /* DATA structure address */

#define CTEST0_REG_700          0x14    /* Chip test 0 ro */
#define CTEST0_REG_800          0x18    /* Chip test 0 rw, general purpose */
/* 0x80 - 0x04 are reserved */
#define CTEST0_700_RTRG         0x02    /* Real target mode */
#define CTEST0_700_DDIR         0x01    /* Data direction, 1 = 
                                         * SCSI bus to host, 0  =
                                         * host to SCSI.
                                         */

#define CTEST1_REG_700          0x15    /* Chip test 1 ro */
#define CTEST1_REG_800          0x19    /* Chip test 1 ro */
#define CTEST1_FMT3             0x80    /* Identify which byte lanes are empty */
#define CTEST1_FMT2             0x40    /* in the DMA FIFO */
#define CTEST1_FMT1             0x20
#define CTEST1_FMT0             0x10

#define CTEST1_FFL3             0x08    /* Identify which bytes lanes are full */
#define CTEST1_FFL2             0x04    /* in the DMA FIFO */
#define CTEST1_FFL1             0x02
#define CTEST1_FFL0             0x01

#define CTEST2_REG_700          0x16    /* Chip test 2 ro */
#define CTEST2_REG_800          0x1a    /* Chip test 2 ro */

#define CTEST2_800_DDIR         0x80    /* 1 = SCSI->host */
#define CTEST2_800_SIGP         0x40    /* A copy of SIGP in ISTAT.
                                           Reading this register clears */
#define CTEST2_800_CIO          0x20    /* Configured as IO */.
#define CTEST2_800_CM           0x10    /* Configured as memory */

/* 0x80 - 0x40 are reserved on 700 series chips */
#define CTEST2_700_SOFF         0x20    /* SCSI Offset Compare,
                                         * As an initiator, this bit is 
                                         * one when the synchronous offset
                                         * is zero, as a target this bit 
                                         * is one when the synchronous 
                                         * offset is at the maximum
                                         * defined in SXFER
                                         */
#define CTEST2_700_SFP          0x10    /* SCSI FIFO parity bit,
                                         * reading CTEST3 unloads a byte
                                         * from the FIFO and sets this
                                         */
#define CTEST2_700_DFP          0x08    /* DMA FIFO parity bit,
                                         * reading CTEST6 unloads a byte
                                         * from the FIFO and sets this
                                         */
#define CTEST2_TEOP             0x04    /* SCSI true end of process,
                                         * indicates a totally finished
                                         * transfer
                                         */
#define CTEST2_DREQ             0x02    /* Data request signal */
/* 0x01 is reserved on 700 series chips */
#define CTEST2_800_DACK         0x01    

/* 
 * Chip test 3 ro 
 * Unloads the bottom byte of the eight deep SCSI synchronous FIFO,
 * check SSTAT2 FIFO full bits to determine size.  Note that a GROSS
 * error results if a read is attempted on this register.  Also note 
 * that 16 and 32 bit reads of this register will cause corruption.
 */
#define CTEST3_REG_700          0x17    
/*  Chip test 3 rw */
#define CTEST3_REG_800          0x1b
#define CTEST3_800_V3           0x80    /* Chip revision */
#define CTEST3_800_V2           0x40
#define CTEST3_800_V1           0x20
#define CTEST3_800_V0           0x10
#define CTEST3_800_FLF          0x08    /* Flush DMA FIFO */
#define CTEST3_800_CLF          0x04    /* Clear DMA FIFO */
#define CTEST3_800_FM           0x02    /* Fetch mode pin */
/* bit 0 is reserved on 800 series chips */

#define CTEST4_REG_700          0x18    /* Chip test 4 rw */
#define CTEST4_REG_800          0x21    /* Chip test 4 rw */
/* 0x80 is reserved on 700 series chips */
#define CTEST4_800_BDIS         0x80    /* Burst mode disable */
#define CTEST4_ZMOD             0x40    /* High impedance mode */
#define CTEST4_SZM              0x20    /* SCSI bus high impedance */
#define CTEST4_700_SLBE         0x10    /* SCSI loopback enabled */
#define CTEST4_800_SRTM         0x10    /* Shadow Register Test Mode */
#define CTEST4_700_SFWR         0x08    /* SCSI FIFO write enable, 
                                         * redirects writes from SODL
                                         * to the SCSI FIFO.
                                         */
#define CTEST4_800_MPEE         0x08    /* Enable parity checking
                                           during master cycles on PCI
                                           bus */

/* 
 * These bits send the contents of the CTEST6 register to the appropriate
 * byte lane of the 32 bit DMA FIFO.  Normal operation is zero, otherwise 
 * the high bit means the low two bits select the byte lane.
 */
#define CTEST4_FBL2             0x04    
#define CTEST4_FBL1             0x02
#define CTEST4_FBL0             0x01    
#define CTEST4_FBL_MASK         0x07
#define CTEST4_FBL_0            0x04    /* Select DMA FIFO byte lane 0 */
#define CTEST4_FBL_1            0x05    /* Select DMA FIFO byte lane 1 */
#define CTEST4_FBL_2            0x06    /* Select DMA FIFO byte lane 2 */
#define CTEST4_FBL_3            0x07    /* Select DMA FIFO byte lane 3 */
#define CTEST4_800_SAVE         (CTEST4_800_BDIS)


#define CTEST5_REG_700          0x19    /* Chip test 5 rw */
#define CTEST5_REG_800          0x22    /* Chip test 5 rw */
/* 
 * Clock Address Incrementor.  When set, it increments the 
 * DNAD register to the next bus size boundary.  It automatically 
 * resets itself when the operation is complete.
 */
#define CTEST5_ADCK             0x80
/*
 * Clock Byte Counter.  When set, it decrements the DBC register to
 * the next bus size boundary.
 */
#define CTEST5_BBCK             0x40
/*
 * Reset SCSI Offset.  Setting this bit to 1 clears the current offset
 * pointer in the SCSI synchronous offset counter (SSTAT).  This bit
 * is set to 1 if a SCSI Gross Error Condition occurs.  The offset should
 * be cleared when a synchronous transfer fails.  When written, it is 
 * automatically cleared after the SCSI synchronous offset counter is 
 * reset.
 */
/* Bit 5 is reserved on 800 series chips */
#define CTEST5_700_ROFF         0x20
/* 
 * Master Control for Set or Reset pulses. When 1, causes the low 
 * four bits of register to set when set, 0 causes the low bits to
 * clear when set.
 */
#define CTEST5_MASR             0x10    
#define CTEST5_DDIR             0x08    /* DMA direction */
/*
 * Bits 2-0 are reserved on 800 series chips
 */
#define CTEST5_700_EOP          0x04    /* End of process */
#define CTEST5_700_DREQ         0x02    /* Data request */
#define CTEST5_700_DACK         0x01    /* Data acknowledge */

/* 
 * Chip test 6 rw - writing to this register writes to the byte 
 * lane in the DMA FIFO as determined by the FBL bits in the CTEST4
 * register.
 */
#define CTEST6_REG_700          0x1a
#define CTEST6_REG_800          0x23

#define CTEST7_REG              0x1b    /* Chip test 7 rw */
/* 0x80 - 0x40 are reserved on NCR53c700 and NCR53c700-66 chips */
#define CTEST7_10_CDIS          0x80    /* Cache burst disable */
#define CTEST7_10_SC1           0x40    /* Snoop control bits */
#define CTEST7_10_SC0           0x20    
#define CTEST7_10_SC_MASK       0x60
/* 0x20 is reserved on the NCR53c700 */
#define CTEST7_0060_FM          0x20    /* Fetch mode */
#define CTEST7_STD              0x10    /* Selection timeout disable */
#define CTEST7_DFP              0x08    /* DMA FIFO parity bit for CTEST6 */
#define CTEST7_EVP              0x04    /* 1 = host bus even parity, 0 = odd */
#define CTEST7_10_TT1           0x02    /* Transfer type */
#define CTEST7_00_DC            0x02    /* Set to drive DC low during instruction 
                                           fetch */
#define CTEST7_DIFF             0x01    /* Differential mode */

#define CTEST7_SAVE ( CTEST7_EVP | CTEST7_DIFF )


#define TEMP_REG                0x1c    /* through 0x1f Temporary stack rw */

#define DFIFO_REG               0x20    /* DMA FIFO rw */
/* 
 * 0x80 is reserved on the NCR53c710, the CLF and FLF bits have been
 * moved into the CTEST8 register.
 */
#define DFIFO_00_FLF            0x80    /* Flush DMA FIFO to memory */
#define DFIFO_00_CLF            0x40    /* Clear DMA and SCSI FIFOs */
#define DFIFO_BO6               0x40
#define DFIFO_BO5               0x20
#define DFIFO_BO4               0x10
#define DFIFO_BO3               0x08
#define DFIFO_BO2               0x04 
#define DFIFO_BO1               0x02
#define DFIFO_BO0               0x01
#define DFIFO_10_BO_MASK        0x7f    /* 7 bit counter */
#define DFIFO_00_BO_MASK        0x3f    /* 6 bit counter */

/* 
 * Interrupt status rw 
 * Note that this is the only register which can be read while SCSI
 * SCRIPTS are being executed.
 */
#define ISTAT_REG_700           0x21
#define ISTAT_REG_800           0x14
#define ISTAT_ABRT              0x80    /* Software abort, write 
                                         *1 to abort, wait for interrupt. */
/* 0x40 and 0x20 are reserved on NCR53c700 and NCR53c700-66 chips */
#define ISTAT_10_SRST           0x40    /* software reset */
#define ISTAT_10_SIGP           0x20    /* signal script */
/* 0x10 is reserved on NCR53c700 series chips */
#define ISTAT_800_SEM           0x10    /* semaphore */
#define ISTAT_CON               0x08    /* 1 when connected */
#define ISTAT_800_INTF          0x04    /* Interrupt on the fly */
#define ISTAT_700_PRE           0x04    /* Pointer register empty.
                                         * Set to 1 when DSPS and DSP
                                         * registers are empty in pipeline
                                         * mode, always set otherwise.
                                         */
#define ISTAT_SIP               0x02    /* SCSI interrupt pending from
                                         * SCSI portion of SIOP see
                                         * SSTAT0
                                         */
#define ISTAT_DIP               0x01    /* DMA interrupt pending 
                                         * see DSTAT
                                         */

/* NCR53c700-66 and NCR53c710 only */
#define CTEST8_REG              0x22    /* Chip test 8 rw */
#define CTEST8_0066_EAS         0x80    /* Enable alternate SCSI clock,
                                         * ie read from SCLK/ rather than CLK/
                                         */
#define CTEST8_0066_EFM         0x40    /* Enable fetch and master outputs */
#define CTEST8_0066_GRP         0x20    /* Generate Receive Parity for 
                                         * pass through.  This insures that 
                                         * bad parity won't reach the host 
                                         * bus.
                                         */
#define CTEST8_0066_TE          0x10    /* TolerANT enable.  Enable 
                                         * active negation, should only
                                         * be used for slow SCSI 
                                         * non-differential.
                                         */
#define CTEST8_0066_HSC         0x08    /* Halt SCSI clock */
#define CTEST8_0066_SRA         0x04    /* Shorten REQ/ACK filtering,
                                         * must be set for fast SCSI-II
                                         * speeds.
                                         */
#define CTEST8_0066_DAS         0x02    /* Disable automatic target/initiator
                                         * switching.
                                         */
#define CTEST8_0066_LDE         0x01    /* Last disconnect enable.
                                         * The status of pending 
                                         * disconnect is maintained by
                                         * the core, eliminating
                                         * the possibility of missing a 
                                         * selection or reselection
                                         * while waiting to fetch a 
                                         * WAIT DISCONNECT opcode.
                                         */

#define CTEST8_10_V3            0x80    /* Chip revision */
#define CTEST8_10_V2            0x40
#define CTEST8_10_V1            0x20    
#define CTEST8_10_V0            0x10
#define CTEST8_10_V_MASK        0xf0    
#define CTEST8_10_FLF           0x08    /* Flush FIFOs */
#define CTEST8_10_CLF           0x04    /* Clear FIFOs */
#define CTEST8_10_FM            0x02    /* Fetch pin mode */
#define CTEST8_10_SM            0x01    /* Snoop pin mode */


/* 
 * The CTEST9 register may be used to differentiate between a
 * NCR53c700 and a NCR53c710.  
 *
 * Write 0xff to this register.
 * Read it.
 * If the contents are 0xff, it is a NCR53c700
 * If the contents are 0x00, it is a NCR53c700-66 first revision
 * If the contents are some other value, it is some other NCR53c700-66
 */
#define CTEST9_REG_00           0x23    /* Chip test 9 ro */
#define LCRC_REG_10             0x23    

/*
 * 0x24 through 0x27 are the DMA byte counter register.  Instructions
 * write their high 8 bits into the DCMD register, the low 24 bits into
 * the DBC register.
 *
 * Function is dependent on the command type being executed.
 */

 
#define DBC_REG                 0x24
/* 
 * For Block Move Instructions, DBC is a 24 bit quantity representing 
 *     the number of bytes to transfer.
 * For Transfer Control Instructions, DBC is bit fielded as follows : 
 */
/* Bits 20 - 23 should be clear */
#define DBC_TCI_TRUE            (1 << 19)       /* Jump when true */
#define DBC_TCI_COMPARE_DATA    (1 << 18)       /* Compare data */
#define DBC_TCI_COMPARE_PHASE   (1 << 17)       /* Compare phase with DCMD field */
#define DBC_TCI_WAIT_FOR_VALID  (1 << 16)       /* Wait for REQ */
/* Bits 8 - 15 are reserved on some implementations ? */
#define DBC_TCI_MASK_MASK       0xff00          /* Mask for data compare */
#define DBC_TCI_MASK_SHIFT      8
#define DBC_TCI_DATA_MASK       0xff            /* Data to be compared */ 
#define DBC_TCI_DATA_SHIFT      0

#define DBC_RWRI_IMMEDIATE_MASK 0xff00          /* Immediate data */
#define DBC_RWRI_IMMEDIATE_SHIFT 8              /* Amount to shift */
#define DBC_RWRI_ADDRESS_MASK   0x3f0000        /* Register address */
#define DBC_RWRI_ADDRESS_SHIFT  16


/*
 * DMA command r/w
 */
#define DCMD_REG                0x27    
#define DCMD_TYPE_MASK          0xc0    /* Masks off type */
#define DCMD_TYPE_BMI           0x00    /* Indicates a Block Move instruction */
#define DCMD_BMI_IO             0x01    /* I/O, CD, and MSG bits selecting   */
#define DCMD_BMI_CD             0x02    /* the phase for the block MOVE      */
#define DCMD_BMI_MSG            0x04    /* instruction                       */

#define DCMD_BMI_OP_MASK        0x18    /* mask for opcode */
#define DCMD_BMI_OP_MOVE_T      0x00    /* MOVE */
#define DCMD_BMI_OP_MOVE_I      0x08    /* MOVE Initiator */

#define DCMD_BMI_INDIRECT       0x20    /*  Indirect addressing */

#define DCMD_TYPE_TCI           0x80    /* Indicates a Transfer Control 
                                           instruction */
#define DCMD_TCI_IO             0x01    /* I/O, CD, and MSG bits selecting   */
#define DCMD_TCI_CD             0x02    /* the phase for the block MOVE      */
#define DCMD_TCI_MSG            0x04    /* instruction                       */
#define DCMD_TCI_OP_MASK        0x38    /* mask for opcode */
#define DCMD_TCI_OP_JUMP        0x00    /* JUMP */
#define DCMD_TCI_OP_CALL        0x08    /* CALL */
#define DCMD_TCI_OP_RETURN      0x10    /* RETURN */
#define DCMD_TCI_OP_INT         0x18    /* INT */

#define DCMD_TYPE_RWRI          0x40    /* Indicates I/O or register Read/Write
                                           instruction */
#define DCMD_RWRI_OPC_MASK      0x38    /* Opcode mask */
#define DCMD_RWRI_OPC_WRITE     0x28    /* Write SFBR to register */
#define DCMD_RWRI_OPC_READ      0x30    /* Read register to SFBR */
#define DCMD_RWRI_OPC_MODIFY    0x38    /* Modify in place */

#define DCMD_RWRI_OP_MASK       0x07
#define DCMD_RWRI_OP_MOVE       0x00
#define DCMD_RWRI_OP_SHL        0x01
#define DCMD_RWRI_OP_OR         0x02
#define DCMD_RWRI_OP_XOR        0x03
#define DCMD_RWRI_OP_AND        0x04
#define DCMD_RWRI_OP_SHR        0x05
#define DCMD_RWRI_OP_ADD        0x06
#define DCMD_RWRI_OP_ADDC       0x07

#define DCMD_TYPE_MMI           0xc0    /* Indicates a Memory Move instruction 
                                           (three words) */


#define DNAD_REG                0x28    /* through 0x2b DMA next address for 
                                           data */
#define DSP_REG                 0x2c    /* through 0x2f DMA SCRIPTS pointer rw */
#define DSPS_REG                0x30    /* through 0x33 DMA SCRIPTS pointer 
                                           save rw */
#define DMODE_REG_00            0x34    /* DMA mode rw */
#define DMODE_00_BL1    0x80    /* Burst length bits */
#define DMODE_00_BL0    0x40
#define DMODE_BL_MASK   0xc0
/* Burst lengths (800) */
#define DMODE_BL_2      0x00    /* 2 transfer */
#define DMODE_BL_4      0x40    /* 4 transfers */
#define DMODE_BL_8      0x80    /* 8 transfers */
#define DMODE_BL_16     0xc0    /* 16 transfers */

#define DMODE_10_BL_1   0x00    /* 1 transfer */
#define DMODE_10_BL_2   0x40    /* 2 transfers */
#define DMODE_10_BL_4   0x80    /* 4 transfers */
#define DMODE_10_BL_8   0xc0    /* 8 transfers */
#define DMODE_10_FC2    0x20    /* Driven to FC2 pin */
#define DMODE_10_FC1    0x10    /* Driven to FC1 pin */
#define DMODE_710_PD    0x08    /* Program/data on FC0 pin */
#define DMODE_710_UO    0x02    /* User prog. output */

#define DMODE_700_BW16  0x20    /* Host buswidth = 16 */
#define DMODE_700_286   0x10    /* 286 mode */
#define DMODE_700_IOM   0x08    /* Transfer to IO port */
#define DMODE_700_FAM   0x04    /* Fixed address mode */
#define DMODE_700_PIPE  0x02    /* Pipeline mode disables 
                                         * automatic fetch / exec 
                                         */
#define DMODE_MAN       0x01            /* Manual start mode, 
                                         * requires a 1 to be written
                                         * to the start DMA bit in the DCNTL
                                         * register to run scripts 
                                         */

#define DMODE_700_SAVE ( DMODE_00_BL_MASK | DMODE_00_BW16 | DMODE_00_286 )

/* NCR53c800 series only */
#define SCRATCHA_REG_800        0x34    /* through 0x37 Scratch A rw */
/* NCR53c710 only */
#define SCRATCHB_REG_10         0x34    /* through 0x37 scratch B rw */

#define DMODE_REG_10            0x38    /* DMA mode rw, NCR53c710 and newer */
#define DMODE_800_SIOM          0x20    /* Source IO = 1 */
#define DMODE_800_DIOM          0x10    /* Destination IO = 1 */
#define DMODE_800_ERL           0x08    /* Enable Read Line */

/* 35-38 are reserved on 700 and 700-66 series chips */
#define DIEN_REG                0x39    /* DMA interrupt enable rw */
/* 0x80, 0x40, and 0x20 are reserved on 700-series chips */
#define DIEN_800_MDPE           0x40    /* Master data parity error */
#define DIEN_800_BF             0x20    /* BUS fault */
#define DIEN_700_BF             0x20    /* BUS fault */
#define DIEN_ABRT               0x10    /* Enable aborted interrupt */
#define DIEN_SSI                0x08    /* Enable single step interrupt */
#define DIEN_SIR                0x04    /* Enable SCRIPTS INT command 
                                         * interrupt
                                         */
/* 0x02 is reserved on 800 series chips */
#define DIEN_700_WTD            0x02    /* Enable watchdog timeout interrupt */
#define DIEN_700_OPC            0x01    /* Enable illegal instruction 
                                         * interrupt 
                                         */
#define DIEN_800_IID            0x01    /*  Same meaning, different name */ 

/*
 * DMA watchdog timer rw
 * set in 16 CLK input periods.
 */
#define DWT_REG                 0x3a

/* DMA control rw */
#define DCNTL_REG               0x3b
#define DCNTL_700_CF1           0x80    /* Clock divisor bits */
#define DCNTL_700_CF0           0x40
#define DCNTL_700_CF_MASK       0xc0
/* Clock divisors                          Divisor SCLK range (MHZ) */
#define DCNTL_700_CF_2          0x00    /* 2.0     37.51-50.00 */
#define DCNTL_700_CF_1_5        0x40    /* 1.5     25.01-37.50 */
#define DCNTL_700_CF_1          0x80    /* 1.0     16.67-25.00 */
#define DCNTL_700_CF_3          0xc0    /* 3.0     50.01-66.67 (53c700-66) */

#define DCNTL_700_S16           0x20    /* Load scripts 16 bits at a time */
#define DCNTL_SSM               0x10    /* Single step mode */
#define DCNTL_700_LLM           0x08    /* Low level mode, can only be set 
                                         * after selection */
#define DCNTL_800_IRQM          0x08    /* Totem pole IRQ pin */
#define DCNTL_STD               0x04    /* Start DMA / SCRIPTS */
/* 0x02 is reserved */
#define DCNTL_00_RST            0x01    /* Software reset, resets everything
                                         * but 286 mode bit  in DMODE. On the
                                         * NCR53c710, this bit moved to CTEST8
                                         */
#define DCNTL_10_COM            0x01    /* 700 software compatibility mode */
#define DCNTL_10_EA             0x20    /* Enable Ack - needed for MVME16x */

#define DCNTL_700_SAVE ( DCNTL_CF_MASK | DCNTL_S16)


/* NCR53c700-66 only */
#define SCRATCHB_REG_00         0x3c    /* through 0x3f scratch b rw */
#define SCRATCHB_REG_800        0x5c    /* through 0x5f scratch b rw */
/* NCR53c710 only */
#define ADDER_REG_10            0x3c    /* Adder, NCR53c710 only */

#define SIEN1_REG_800           0x41
#define SIEN1_800_STO           0x04    /* selection/reselection timeout */
#define SIEN1_800_GEN           0x02    /* general purpose timer */
#define SIEN1_800_HTH           0x01    /* handshake to handshake */

#define SIST1_REG_800           0x43
#define SIST1_800_STO           0x04    /* selection/reselection timeout */
#define SIST1_800_GEN           0x02    /* general purpose timer */
#define SIST1_800_HTH           0x01    /* handshake to handshake */

#define SLPAR_REG_800           0x44    /* Parity */

#define MACNTL_REG_800          0x46    /* Memory access control */
#define MACNTL_800_TYP3         0x80
#define MACNTL_800_TYP2         0x40
#define MACNTL_800_TYP1         0x20
#define MACNTL_800_TYP0         0x10
#define MACNTL_800_DWR          0x08
#define MACNTL_800_DRD          0x04
#define MACNTL_800_PSCPT        0x02
#define MACNTL_800_SCPTS        0x01

#define GPCNTL_REG_800          0x47    /* General Purpose Pin Control */

/* Timeouts are expressed such that 0=off, 1=100us, doubling after that */
#define STIME0_REG_800          0x48    /* SCSI Timer Register 0 */
#define STIME0_800_HTH_MASK     0xf0    /* Handshake to Handshake timeout */
#define STIME0_800_HTH_SHIFT    4
#define STIME0_800_SEL_MASK     0x0f    /* Selection timeout */
#define STIME0_800_SEL_SHIFT    0

#define STIME1_REG_800          0x49
#define STIME1_800_GEN_MASK     0x0f    /* General purpose timer */

#define RESPID_REG_800          0x4a    /* Response ID, bit fielded.  8
                                           bits on narrow chips, 16 on WIDE */

#define STEST0_REG_800          0x4c    
#define STEST0_800_SLT          0x08    /* Selection response logic test */
#define STEST0_800_ART          0x04    /* Arbitration priority encoder test */
#define STEST0_800_SOZ          0x02    /* Synchronous offset zero */
#define STEST0_800_SOM          0x01    /* Synchronous offset maximum */

#define STEST1_REG_800          0x4d
#define STEST1_800_SCLK         0x80    /* Disable SCSI clock */

#define STEST2_REG_800          0x4e    
#define STEST2_800_SCE          0x80    /* Enable SOCL/SODL */
#define STEST2_800_ROF          0x40    /* Reset SCSI sync offset */
#define STEST2_800_SLB          0x10    /* Enable SCSI loopback mode */
#define STEST2_800_SZM          0x08    /* SCSI high impedance mode */
#define STEST2_800_EXT          0x02    /* Extend REQ/ACK filter 30 to 60ns */
#define STEST2_800_LOW          0x01    /* SCSI low level mode */

#define STEST3_REG_800          0x4f     
#define STEST3_800_TE           0x80    /* Enable active negation */
#define STEST3_800_STR          0x40    /* SCSI FIFO test read */
#define STEST3_800_HSC          0x20    /* Halt SCSI clock */
#define STEST3_800_DSI          0x10    /* Disable single initiator response */
#define STEST3_800_TTM          0x04    /* Time test mode */
#define STEST3_800_CSF          0x02    /* Clear SCSI FIFO */
#define STEST3_800_STW          0x01    /* SCSI FIFO test write */

#define OPTION_PARITY           0x1     /* Enable parity checking */
#define OPTION_TAGGED_QUEUE     0x2     /* Enable SCSI-II tagged queuing */
#define OPTION_700              0x8     /* Always run NCR53c700 scripts */
#define OPTION_INTFLY           0x10    /* Use INTFLY interrupts */
#define OPTION_DEBUG_INTR       0x20    /* Debug interrupts */
#define OPTION_DEBUG_INIT_ONLY  0x40    /* Run initialization code and 
                                           simple test code, return
                                           DID_NO_CONNECT if any SCSI
                                           commands are attempted. */
#define OPTION_DEBUG_READ_ONLY  0x80    /* Return DID_ERROR if any 
                                           SCSI write is attempted */
#define OPTION_DEBUG_TRACE      0x100   /* Animated trace mode, print 
                                           each address and instruction 
                                           executed to debug buffer. */
#define OPTION_DEBUG_SINGLE     0x200   /* stop after executing one 
                                           instruction */
#define OPTION_SYNCHRONOUS      0x400   /* Enable sync SCSI.  */
#define OPTION_MEMORY_MAPPED    0x800   /* NCR registers have valid 
                                           memory mapping */
#define OPTION_IO_MAPPED        0x1000  /* NCR registers have valid
                                             I/O mapping */
#define OPTION_DEBUG_PROBE_ONLY 0x2000  /* Probe only, don't even init */
#define OPTION_DEBUG_TESTS_ONLY 0x4000  /* Probe, init, run selected tests */
#define OPTION_DEBUG_TEST0      0x08000 /* Run test 0 */
#define OPTION_DEBUG_TEST1      0x10000 /* Run test 1 */
#define OPTION_DEBUG_TEST2      0x20000 /* Run test 2 */
#define OPTION_DEBUG_DUMP       0x40000 /* Dump commands */
#define OPTION_DEBUG_TARGET_LIMIT 0x80000 /* Only talk to target+luns specified */
#define OPTION_DEBUG_NCOMMANDS_LIMIT 0x100000 /* Limit the number of commands */
#define OPTION_DEBUG_SCRIPT 0x200000 /* Print when checkpoints are passed */
#define OPTION_DEBUG_FIXUP 0x400000 /* print fixup values */
#define OPTION_DEBUG_DSA 0x800000
#define OPTION_DEBUG_CORRUPTION 0x1000000       /* Detect script corruption */
#define OPTION_DEBUG_SDTR       0x2000000       /* Debug SDTR problem */
#define OPTION_DEBUG_MISMATCH   0x4000000       /* Debug phase mismatches */
#define OPTION_DISCONNECT       0x8000000       /* Allow disconnect */
#define OPTION_DEBUG_DISCONNECT 0x10000000      
#define OPTION_ALWAYS_SYNCHRONOUS 0x20000000    /* Negotiate sync. transfers
                                                   on power up */
#define OPTION_DEBUG_QUEUES     0x80000000      
#define OPTION_DEBUG_ALLOCATION 0x100000000LL
#define OPTION_DEBUG_SYNCHRONOUS 0x200000000LL  /* Sanity check SXFER and 
                                                   SCNTL3 registers */
#define OPTION_NO_ASYNC 0x400000000LL           /* Don't automagically send
                                                   SDTR for async transfers when
                                                   we haven't been told to do
                                                   a synchronous transfer. */
#define OPTION_NO_PRINT_RACE 0x800000000LL      /* Don't print message when
                                                   the reselect/WAIT DISCONNECT
                                                   race condition hits */
#if !defined(PERM_OPTIONS)
#define PERM_OPTIONS 0
#endif
                                
/*
 * Some data which is accessed by the NCR chip must be 4-byte aligned.
 * For some hosts the default is less than that (eg. 68K uses 2-byte).
 * Alignment has only been forced where it is important; also if one
 * 32 bit structure field is aligned then it is assumed that following
 * 32 bit fields are also aligned.  Take care when adding fields
 * which are other than 32 bit.
 */

struct NCR53c7x0_synchronous {
    u32 select_indirect                 /* Value used for indirect selection */
        __attribute__ ((aligned (4)));
    u32 sscf_710;                       /* Used to set SSCF bits for 710 */
    u32 script[8];                      /* Size ?? Script used when target is 
                                                reselected */
    unsigned char synchronous_want[5];  /* Per target desired SDTR */
/* 
 * Set_synchronous programs these, select_indirect and current settings after
 * int_debug_should show a match.
 */
    unsigned char sxfer_sanity, scntl3_sanity;
};

#define CMD_FLAG_SDTR           1       /* Initiating synchronous 
                                           transfer negotiation */
#define CMD_FLAG_WDTR           2       /* Initiating wide transfer
                                           negotiation */
#define CMD_FLAG_DID_SDTR       4       /* did SDTR */
#define CMD_FLAG_DID_WDTR       8       /* did WDTR */

struct NCR53c7x0_table_indirect {
    u32 count;
    void *address;
};

enum ncr_event { 
    EVENT_NONE = 0,
/* 
 * Order is IMPORTANT, since these must correspond to the event interrupts
 * in 53c7,8xx.scr 
 */

    EVENT_ISSUE_QUEUE = 0x5000000,      /* 0 Command was added to issue queue */
    EVENT_START_QUEUE,                  /* 1 Command moved to start queue */
    EVENT_SELECT,                       /* 2 Command completed selection */
    EVENT_DISCONNECT,                   /* 3 Command disconnected */
    EVENT_RESELECT,                     /* 4 Command reselected */
    EVENT_COMPLETE,                     /* 5 Command completed */
    EVENT_IDLE,                         /* 6 */
    EVENT_SELECT_FAILED,                /* 7 */
    EVENT_BEFORE_SELECT,                /* 8 */
    EVENT_RESELECT_FAILED               /* 9 */
};

struct NCR53c7x0_event {
    enum ncr_event event;       /* What type of event */
    unsigned char target;
    unsigned char lun;
    struct timeval time;        
    u32 *dsa;                   /* What's in the DSA register now (virt) */
/* 
 * A few things from that SCSI pid so we know what happened after 
 * the Scsi_Cmnd structure in question may have disappeared.
 */
    unsigned long pid;          /* The SCSI PID which caused this 
                                   event */
    unsigned char cmnd[12];
};

/*
 * Things in the NCR53c7x0_cmd structure are split into two parts :
 *
 * 1.  A fixed portion, for things which are not accessed directly by static NCR
 *      code (ie, are referenced only by the Linux side of the driver,
 *      or only by dynamically generated code).  
 *
 * 2.  The DSA portion, for things which are accessed directly by static NCR
 *      code.
 *
 * This is a little ugly, but it 
 * 1.  Avoids conflicts between the NCR code's picture of the structure, and 
 *      Linux code's idea of what it looks like.
 *
 * 2.  Minimizes the pain in the Linux side of the code needed 
 *      to calculate real dsa locations for things, etc.
 * 
 */

struct NCR53c7x0_cmd {
    void *real;                         /* Real, unaligned address for
                                           free function */
    void (* free)(void *, int);         /* Command to deallocate; NULL
                                           for structures allocated with
                                           scsi_register, etc. */
    Scsi_Cmnd *cmd;                     /* Associated Scsi_Cmnd 
                                           structure, Scsi_Cmnd points
                                           at NCR53c7x0_cmd using 
                                           host_scribble structure */

    int size;                           /* scsi_malloc'd size of this 
                                           structure */

    int flags;                          /* CMD_* flags */

    unsigned char      cmnd[12];        /* CDB, copied from Scsi_Cmnd */
    int                result;          /* Copy to Scsi_Cmnd when done */

    struct {                            /* Private non-cached bounce buffer */
        unsigned char buf[256];
        u32           addr;
        u32           len;
    } bounce;

/*
 * SDTR and WIDE messages are an either/or affair
 * in this message, since we will go into message out and send
 * _the whole mess_ without dropping out of message out to 
 * let the target go into message in after sending the first 
 * message.
 */

    unsigned char select[11];           /* Select message, includes
                                           IDENTIFY
                                           (optional) QUEUE TAG
                                           (optional) SDTR or WDTR
                                         */


    volatile struct NCR53c7x0_cmd *next; /* Linux maintained lists (free,
                                            running, eventually finished */
                                         

    u32 *data_transfer_start;           /* Start of data transfer routines */
    u32 *data_transfer_end;             /* Address after end of data transfer o
                                           routines */
/* 
 * The following three fields were moved from the DSA proper to here
 * since only dynamically generated NCR code refers to them, meaning
 * we don't need dsa_* absolutes, and it is simpler to let the 
 * host code refer to them directly.
 */

/* 
 * HARD CODED : residual and saved_residual need to agree with the sizes
 * used in NCR53c7,8xx.scr.  
 * 
 * FIXME: we want to consider the case where we have odd-length 
 *      scatter/gather buffers and a WIDE transfer, in which case 
 *      we'll need to use the CHAIN MOVE instruction.  Ick.
 */
    u32 residual[6] __attribute__ ((aligned (4)));
                                        /* Residual data transfer which
                                           allows pointer code to work
                                           right.

                                            [0-1] : Conditional call to 
                                                appropriate other transfer 
                                                routine.
                                            [2-3] : Residual block transfer
                                                instruction.
                                            [4-5] : Jump to instruction
                                                after splice.
                                         */
    u32 saved_residual[6];              /* Copy of old residual, so we 
                                           can get another partial 
                                           transfer and still recover 
                                         */
                
    u32 saved_data_pointer;             /* Saved data pointer */

    u32 dsa_next_addr;                  /* _Address_ of dsa_next field  
                                           in this dsa for RISCy 
                                           style constant. */

    u32 dsa_addr;                       /* Address of dsa; RISCy style
                                           constant */

    u32 dsa[0];                         /* Variable length (depending
                                           on host type, number of scatter /
                                           gather buffers, etc).  */
};

struct NCR53c7x0_break {
    u32 *address, old_instruction[2];
    struct NCR53c7x0_break *next;
    unsigned char old_size;             /* Size of old instruction */
};

/* Indicates that the NCR is not executing code */
#define STATE_HALTED    0               
/* 
 * Indicates that the NCR is executing the wait for select / reselect 
 * script.  Only used when running NCR53c700 compatible scripts, only 
 * state during which an ABORT is _not_ considered an error condition.
 */
#define STATE_WAITING   1               
/* Indicates that the NCR is executing other code. */
#define STATE_RUNNING   2               
/* 
 * Indicates that the NCR was being aborted.
 */
#define STATE_ABORTING  3
/* Indicates that the NCR was successfully aborted. */
#define STATE_ABORTED 4
/* Indicates that the NCR has been disabled due to a fatal error */
#define STATE_DISABLED 5

/* 
 * Where knowledge of SCSI SCRIPT(tm) specified values are needed 
 * in an interrupt handler, an interrupt handler exists for each 
 * different SCSI script so we don't have name space problems.
 * 
 * Return values of these handlers are as follows : 
 */
#define SPECIFIC_INT_NOTHING    0       /* don't even restart */
#define SPECIFIC_INT_RESTART    1       /* restart at the next instruction */
#define SPECIFIC_INT_ABORT      2       /* recoverable error, abort cmd */
#define SPECIFIC_INT_PANIC      3       /* unrecoverable error, panic */
#define SPECIFIC_INT_DONE       4       /* normal command completion */
#define SPECIFIC_INT_BREAK      5       /* break point encountered */

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 */

    char valid_ids[8];                  /* Valid SCSI ID's for adapter */

    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
        __attribute__ ((aligned (4)));
    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]
        __attribute__ ((aligned (4)));

    volatile Scsi_Cmnd *issue_queue
        __attribute__ ((aligned (4)));
                                                /* waiting to be issued by
                                                   Linux driver */
    volatile struct NCR53c7x0_cmd *running_list;        
                                                /* commands running, maintained
                                                   by Linux driver */

    volatile struct NCR53c7x0_cmd *ncrcurrent;  /* 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
        __attribute__ ((aligned (4)));          /* 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
        __attribute__ ((aligned (4)));          /* 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
        __attribute__ ((aligned (4)));
    s32 NCR53c7xx_sink;
    u32 NOP_insn;
    char NCR53c7xx_msg_reject;
    char NCR53c7xx_msg_abort;
    char NCR53c7xx_msg_nop;

    /*
     * Following item introduced by RGH to support NCRc710, which is
     * VERY brain-dead when it come to memory moves
     */

                          /* DSA save area used only by the NCR chip */
    volatile unsigned long saved2_dsa
        __attribute__ ((aligned (4)));

    volatile unsigned long emulated_intfly
        __attribute__ ((aligned (4)));

    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[0])-> options & OPTION_MEMORY_MAPPED 

#ifdef BIG_ENDIAN
/* These could be more efficient, given that we are always memory mapped,
 * but they don't give the same problems as the write macros, so leave
 * them. */
#define NCR53c7x0_read8(address)                                        \
    (NCR53c7x0_memory_mapped ?                                          \
        (unsigned int)readb((u32)NCR53c7x0_address_memory + ((u32)(address)^3)) :       \
        inb(NCR53c7x0_address_io + (address)))

#define NCR53c7x0_read16(address)                                       \
    (NCR53c7x0_memory_mapped ?                                          \
        (unsigned int)readw((u32)NCR53c7x0_address_memory + ((u32)(address)^2)) :       \
        inw(NCR53c7x0_address_io + (address)))
#else
#define NCR53c7x0_read8(address)                                        \
    (NCR53c7x0_memory_mapped ?                                          \
        (unsigned int)readb((u32)NCR53c7x0_address_memory + (u32)(address)) :   \
        inb(NCR53c7x0_address_io + (address)))

#define NCR53c7x0_read16(address)                                       \
    (NCR53c7x0_memory_mapped ?                                          \
        (unsigned int)readw((u32)NCR53c7x0_address_memory + (u32)(address)) :   \
        inw(NCR53c7x0_address_io + (address)))
#endif
#define NCR53c7x0_read32(address)                                       \
    (NCR53c7x0_memory_mapped ?                                          \
        (unsigned int) readl((u32)NCR53c7x0_address_memory + (u32)(address)) :  \
        inl(NCR53c7x0_address_io + (address)))

#ifdef BIG_ENDIAN
/* If we are big-endian, then we are not Intel, so probably don't have
 * an i/o map as well as a memory map.  So, let's assume memory mapped.
 * Also, I am having terrible problems trying to persuade the compiler
 * not to lay down code which does a read after write for these macros.
 * If you remove 'volatile' from writeb() and friends it is ok....
 */

#define NCR53c7x0_write8(address,value)                                 \
        *(volatile unsigned char *)                                     \
                ((u32)NCR53c7x0_address_memory + ((u32)(address)^3)) = (value)

#define NCR53c7x0_write16(address,value)                                \
        *(volatile unsigned short *)                                    \
                ((u32)NCR53c7x0_address_memory + ((u32)(address)^2)) = (value)

#define NCR53c7x0_write32(address,value)                                \
        *(volatile unsigned long *)                                     \
                ((u32)NCR53c7x0_address_memory + ((u32)(address))) = (value)

#else

#define NCR53c7x0_write8(address,value)                                 \
    (NCR53c7x0_memory_mapped ?                                          \
     ({writeb((value), (u32)NCR53c7x0_address_memory + (u32)(address)); mb();}) :       \
        outb((value), NCR53c7x0_address_io + (address)))

#define NCR53c7x0_write16(address,value)                                \
    (NCR53c7x0_memory_mapped ?                                          \
     ({writew((value), (u32)NCR53c7x0_address_memory + (u32)(address)); mb();}) :       \
        outw((value), NCR53c7x0_address_io + (address)))

#define NCR53c7x0_write32(address,value)                                \
    (NCR53c7x0_memory_mapped ?                                          \
     ({writel((value), (u32)NCR53c7x0_address_memory + (u32)(address)); mb();}) :       \
        outl((value), NCR53c7x0_address_io + (address)))

#endif

/* 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) (value));                                 \
        }

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

#endif /* NCR53c710_C */
#endif /* NCR53c710_H */