[linux-2.6] / drivers / scsi / sym53c8xx_2 / sym_hipd.h

/*
 * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family 
 * of PCI-SCSI IO processors.
 *
 * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
 *
 * This driver is derived from the Linux sym53c8xx driver.
 * Copyright (C) 1998-2000  Gerard Roudier
 *
 * The sym53c8xx driver is derived from the ncr53c8xx driver that had been 
 * a port of the FreeBSD ncr driver to Linux-1.2.13.
 *
 * The original ncr driver has been written for 386bsd and FreeBSD by
 *         Wolfgang Stanglmeier        <wolf@cologne.de>
 *         Stefan Esser                <se@mi.Uni-Koeln.de>
 * Copyright (C) 1994  Wolfgang Stanglmeier
 *
 * Other major contributions:
 *
 * NVRAM detection and reading.
 * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
 *
 *-----------------------------------------------------------------------------
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/gfp.h>

#ifndef SYM_HIPD_H
#define SYM_HIPD_H

/*
 *  Generic driver options.
 *
 *  They may be defined in platform specific headers, if they 
 *  are useful.
 *
 *    SYM_OPT_HANDLE_DIR_UNKNOWN
 *        When this option is set, the SCRIPTS used by the driver 
 *        are able to handle SCSI transfers with direction not 
 *        supplied by user.
 *        (set for Linux-2.0.X)
 *
 *    SYM_OPT_HANDLE_DEVICE_QUEUEING
 *        When this option is set, the driver will use a queue per 
 *        device and handle QUEUE FULL status requeuing internally.
 *
 *    SYM_OPT_LIMIT_COMMAND_REORDERING
 *        When this option is set, the driver tries to limit tagged 
 *        command reordering to some reasonnable value.
 *        (set for Linux)
 */
#if 0
#define SYM_OPT_HANDLE_DIR_UNKNOWN
#define SYM_OPT_HANDLE_DEVICE_QUEUEING
#define SYM_OPT_LIMIT_COMMAND_REORDERING
#endif

/*
 *  Active debugging tags and verbosity.
 *  Both DEBUG_FLAGS and sym_verbose can be redefined 
 *  by the platform specific code to something else.
 */
#define DEBUG_ALLOC     (0x0001)
#define DEBUG_PHASE     (0x0002)
#define DEBUG_POLL      (0x0004)
#define DEBUG_QUEUE     (0x0008)
#define DEBUG_RESULT    (0x0010)
#define DEBUG_SCATTER   (0x0020)
#define DEBUG_SCRIPT    (0x0040)
#define DEBUG_TINY      (0x0080)
#define DEBUG_TIMING    (0x0100)
#define DEBUG_NEGO      (0x0200)
#define DEBUG_TAGS      (0x0400)
#define DEBUG_POINTER   (0x0800)

#ifndef DEBUG_FLAGS
#define DEBUG_FLAGS     (0x0000)
#endif

#ifndef sym_verbose
#define sym_verbose     (np->verbose)
#endif

/*
 *  These ones should have been already defined.
 */
#ifndef assert
#define assert(expression) { \
        if (!(expression)) { \
                (void)panic( \
                        "assertion \"%s\" failed: file \"%s\", line %d\n", \
                        #expression, \
                        __FILE__, __LINE__); \
        } \
}
#endif

/*
 *  Number of tasks per device we want to handle.
 */
#if     SYM_CONF_MAX_TAG_ORDER > 8
#error  "more than 256 tags per logical unit not allowed."
#endif
#define SYM_CONF_MAX_TASK       (1<<SYM_CONF_MAX_TAG_ORDER)

/*
 *  Donnot use more tasks that we can handle.
 */
#ifndef SYM_CONF_MAX_TAG
#define SYM_CONF_MAX_TAG        SYM_CONF_MAX_TASK
#endif
#if     SYM_CONF_MAX_TAG > SYM_CONF_MAX_TASK
#undef  SYM_CONF_MAX_TAG
#define SYM_CONF_MAX_TAG        SYM_CONF_MAX_TASK
#endif

/*
 *    This one means 'NO TAG for this job'
 */
#define NO_TAG  (256)

/*
 *  Number of SCSI targets.
 */
#if     SYM_CONF_MAX_TARGET > 16
#error  "more than 16 targets not allowed."
#endif

/*
 *  Number of logical units per target.
 */
#if     SYM_CONF_MAX_LUN > 64
#error  "more than 64 logical units per target not allowed."
#endif

/*
 *    Asynchronous pre-scaler (ns). Shall be 40 for 
 *    the SCSI timings to be compliant.
 */
#define SYM_CONF_MIN_ASYNC (40)


/*
 * MEMORY ALLOCATOR.
 */

#define SYM_MEM_WARN    1       /* Warn on failed operations */

#define SYM_MEM_PAGE_ORDER 0    /* 1 PAGE  maximum */
#define SYM_MEM_CLUSTER_SHIFT   (PAGE_SHIFT+SYM_MEM_PAGE_ORDER)
#define SYM_MEM_FREE_UNUSED     /* Free unused pages immediately */
/*
 *  Shortest memory chunk is (1<<SYM_MEM_SHIFT), currently 16.
 *  Actual allocations happen as SYM_MEM_CLUSTER_SIZE sized.
 *  (1 PAGE at a time is just fine).
 */
#define SYM_MEM_SHIFT   4
#define SYM_MEM_CLUSTER_SIZE    (1UL << SYM_MEM_CLUSTER_SHIFT)
#define SYM_MEM_CLUSTER_MASK    (SYM_MEM_CLUSTER_SIZE-1)

/*
 *  Number of entries in the START and DONE queues.
 *
 *  We limit to 1 PAGE in order to succeed allocation of 
 *  these queues. Each entry is 8 bytes long (2 DWORDS).
 */
#ifdef  SYM_CONF_MAX_START
#define SYM_CONF_MAX_QUEUE (SYM_CONF_MAX_START+2)
#else
#define SYM_CONF_MAX_QUEUE (7*SYM_CONF_MAX_TASK+2)
#define SYM_CONF_MAX_START (SYM_CONF_MAX_QUEUE-2)
#endif

#if     SYM_CONF_MAX_QUEUE > SYM_MEM_CLUSTER_SIZE/8
#undef  SYM_CONF_MAX_QUEUE
#define SYM_CONF_MAX_QUEUE (SYM_MEM_CLUSTER_SIZE/8)
#undef  SYM_CONF_MAX_START
#define SYM_CONF_MAX_START (SYM_CONF_MAX_QUEUE-2)
#endif

/*
 *  For this one, we want a short name :-)
 */
#define MAX_QUEUE       SYM_CONF_MAX_QUEUE

/*
 *  Common definitions for both bus space based and legacy IO methods.
 */

#define INB_OFF(np, o)          ioread8(np->s.ioaddr + (o))
#define INW_OFF(np, o)          ioread16(np->s.ioaddr + (o))
#define INL_OFF(np, o)          ioread32(np->s.ioaddr + (o))

#define OUTB_OFF(np, o, val)    iowrite8((val), np->s.ioaddr + (o))
#define OUTW_OFF(np, o, val)    iowrite16((val), np->s.ioaddr + (o))
#define OUTL_OFF(np, o, val)    iowrite32((val), np->s.ioaddr + (o))

#define INB(np, r)              INB_OFF(np, offsetof(struct sym_reg, r))
#define INW(np, r)              INW_OFF(np, offsetof(struct sym_reg, r))
#define INL(np, r)              INL_OFF(np, offsetof(struct sym_reg, r))

#define OUTB(np, r, v)          OUTB_OFF(np, offsetof(struct sym_reg, r), (v))
#define OUTW(np, r, v)          OUTW_OFF(np, offsetof(struct sym_reg, r), (v))
#define OUTL(np, r, v)          OUTL_OFF(np, offsetof(struct sym_reg, r), (v))

#define OUTONB(np, r, m)        OUTB(np, r, INB(np, r) | (m))
#define OUTOFFB(np, r, m)       OUTB(np, r, INB(np, r) & ~(m))
#define OUTONW(np, r, m)        OUTW(np, r, INW(np, r) | (m))
#define OUTOFFW(np, r, m)       OUTW(np, r, INW(np, r) & ~(m))
#define OUTONL(np, r, m)        OUTL(np, r, INL(np, r) | (m))
#define OUTOFFL(np, r, m)       OUTL(np, r, INL(np, r) & ~(m))

/*
 *  We normally want the chip to have a consistent view
 *  of driver internal data structures when we restart it.
 *  Thus these macros.
 */
#define OUTL_DSP(np, v)                         \
        do {                                    \
                MEMORY_WRITE_BARRIER();         \
                OUTL(np, nc_dsp, (v));          \
        } while (0)

#define OUTONB_STD()                            \
        do {                                    \
                MEMORY_WRITE_BARRIER();         \
                OUTONB(np, nc_dcntl, (STD|NOCOM));      \
        } while (0)

/*
 *  Command control block states.
 */
#define HS_IDLE         (0)
#define HS_BUSY         (1)
#define HS_NEGOTIATE    (2)     /* sync/wide data transfer*/
#define HS_DISCONNECT   (3)     /* Disconnected by target */
#define HS_WAIT         (4)     /* waiting for resource   */

#define HS_DONEMASK     (0x80)
#define HS_COMPLETE     (4|HS_DONEMASK)
#define HS_SEL_TIMEOUT  (5|HS_DONEMASK) /* Selection timeout      */
#define HS_UNEXPECTED   (6|HS_DONEMASK) /* Unexpected disconnect  */
#define HS_COMP_ERR     (7|HS_DONEMASK) /* Completed with error   */

/*
 *  Software Interrupt Codes
 */
#define SIR_BAD_SCSI_STATUS     (1)
#define SIR_SEL_ATN_NO_MSG_OUT  (2)
#define SIR_MSG_RECEIVED        (3)
#define SIR_MSG_WEIRD           (4)
#define SIR_NEGO_FAILED         (5)
#define SIR_NEGO_PROTO          (6)
#define SIR_SCRIPT_STOPPED      (7)
#define SIR_REJECT_TO_SEND      (8)
#define SIR_SWIDE_OVERRUN       (9)
#define SIR_SODL_UNDERRUN       (10)
#define SIR_RESEL_NO_MSG_IN     (11)
#define SIR_RESEL_NO_IDENTIFY   (12)
#define SIR_RESEL_BAD_LUN       (13)
#define SIR_TARGET_SELECTED     (14)
#define SIR_RESEL_BAD_I_T_L     (15)
#define SIR_RESEL_BAD_I_T_L_Q   (16)
#define SIR_ABORT_SENT          (17)
#define SIR_RESEL_ABORTED       (18)
#define SIR_MSG_OUT_DONE        (19)
#define SIR_COMPLETE_ERROR      (20)
#define SIR_DATA_OVERRUN        (21)
#define SIR_BAD_PHASE           (22)
#if     SYM_CONF_DMA_ADDRESSING_MODE == 2
#define SIR_DMAP_DIRTY          (23)
#define SIR_MAX                 (23)
#else
#define SIR_MAX                 (22)
#endif

/*
 *  Extended error bit codes.
 *  xerr_status field of struct sym_ccb.
 */
#define XE_EXTRA_DATA   (1)     /* unexpected data phase         */
#define XE_BAD_PHASE    (1<<1)  /* illegal phase (4/5)           */
#define XE_PARITY_ERR   (1<<2)  /* unrecovered SCSI parity error */
#define XE_SODL_UNRUN   (1<<3)  /* ODD transfer in DATA OUT phase */
#define XE_SWIDE_OVRUN  (1<<4)  /* ODD transfer in DATA IN phase */

/*
 *  Negotiation status.
 *  nego_status field of struct sym_ccb.
 */
#define NS_SYNC         (1)
#define NS_WIDE         (2)
#define NS_PPR          (3)

/*
 *  A CCB hashed table is used to retrieve CCB address 
 *  from DSA value.
 */
#define CCB_HASH_SHIFT          8
#define CCB_HASH_SIZE           (1UL << CCB_HASH_SHIFT)
#define CCB_HASH_MASK           (CCB_HASH_SIZE-1)
#if 1
#define CCB_HASH_CODE(dsa)      \
        (((dsa) >> (_LGRU16_(sizeof(struct sym_ccb)))) & CCB_HASH_MASK)
#else
#define CCB_HASH_CODE(dsa)      (((dsa) >> 9) & CCB_HASH_MASK)
#endif

#if     SYM_CONF_DMA_ADDRESSING_MODE == 2
/*
 *  We may want to use segment registers for 64 bit DMA.
 *  16 segments registers -> up to 64 GB addressable.
 */
#define SYM_DMAP_SHIFT  (4)
#define SYM_DMAP_SIZE   (1u<<SYM_DMAP_SHIFT)
#define SYM_DMAP_MASK   (SYM_DMAP_SIZE-1)
#endif

/*
 *  Device flags.
 */
#define SYM_DISC_ENABLED        (1)
#define SYM_TAGS_ENABLED        (1<<1)
#define SYM_SCAN_BOOT_DISABLED  (1<<2)
#define SYM_SCAN_LUNS_DISABLED  (1<<3)

/*
 *  Host adapter miscellaneous flags.
 */
#define SYM_AVOID_BUS_RESET     (1)

/*
 *  Misc.
 */
#define SYM_SNOOP_TIMEOUT (10000000)
#define BUS_8_BIT       0
#define BUS_16_BIT      1

/*
 *  Gather negotiable parameters value
 */
struct sym_trans {
        u8 period;
        u8 offset;
        unsigned int width:1;
        unsigned int iu:1;
        unsigned int dt:1;
        unsigned int qas:1;
        unsigned int check_nego:1;
};

/*
 *  Global TCB HEADER.
 *
 *  Due to lack of indirect addressing on earlier NCR chips,
 *  this substructure is copied from the TCB to a global 
 *  address after selection.
 *  For SYMBIOS chips that support LOAD/STORE this copy is 
 *  not needed and thus not performed.
 */
struct sym_tcbh {
        /*
         *  Scripts bus addresses of LUN table accessed from scripts.
         *  LUN #0 is a special case, since multi-lun devices are rare, 
         *  and we we want to speed-up the general case and not waste 
         *  resources.
         */
        u32     luntbl_sa;      /* bus address of this table    */
        u32     lun0_sa;        /* bus address of LCB #0        */
        /*
         *  Actual SYNC/WIDE IO registers value for this target.
         *  'sval', 'wval' and 'uval' are read from SCRIPTS and 
         *  so have alignment constraints.
         */
/*0*/   u_char  uval;           /* -> SCNTL4 register           */
/*1*/   u_char  sval;           /* -> SXFER  io register        */
/*2*/   u_char  filler1;
/*3*/   u_char  wval;           /* -> SCNTL3 io register        */
};

/*
 *  Target Control Block
 */
struct sym_tcb {
        /*
         *  TCB header.
         *  Assumed at offset 0.
         */
/*0*/   struct sym_tcbh head;

        /*
         *  LUN table used by the SCRIPTS processor.
         *  An array of bus addresses is used on reselection.
         */
        u32     *luntbl;        /* LCBs bus address table       */

        /*
         *  LUN table used by the C code.
         */
        struct sym_lcb *lun0p;          /* LCB of LUN #0 (usual case)   */
#if SYM_CONF_MAX_LUN > 1
        struct sym_lcb **lunmp;         /* Other LCBs [1..MAX_LUN]      */
#endif

#ifdef  SYM_HAVE_STCB
        /*
         *  O/S specific data structure.
         */
        struct sym_stcb s;
#endif

        /* Transfer goal */
        struct sym_trans tgoal;

        /*
         * Keep track of the CCB used for the negotiation in order
         * to ensure that only 1 negotiation is queued at a time.
         */
        struct sym_ccb *  nego_cp;      /* CCB used for the nego                */

        /*
         *  Set when we want to reset the device.
         */
        u_char  to_reset;

        /*
         *  Other user settable limits and options.
         *  These limits are read from the NVRAM if present.
         */
        u_char  usrflags;
        u_short usrtags;
        struct scsi_target *starget;
};

/*
 *  Global LCB HEADER.
 *
 *  Due to lack of indirect addressing on earlier NCR chips,
 *  this substructure is copied from the LCB to a global 
 *  address after selection.
 *  For SYMBIOS chips that support LOAD/STORE this copy is 
 *  not needed and thus not performed.
 */
struct sym_lcbh {
        /*
         *  SCRIPTS address jumped by SCRIPTS on reselection.
         *  For not probed logical units, this address points to 
         *  SCRIPTS that deal with bad LU handling (must be at 
         *  offset zero of the LCB for that reason).
         */
/*0*/   u32     resel_sa;

        /*
         *  Task (bus address of a CCB) read from SCRIPTS that points 
         *  to the unique ITL nexus allowed to be disconnected.
         */
        u32     itl_task_sa;

        /*
         *  Task table bus address (read from SCRIPTS).
         */
        u32     itlq_tbl_sa;
};

/*
 *  Logical Unit Control Block
 */
struct sym_lcb {
        /*
         *  TCB header.
         *  Assumed at offset 0.
         */
/*0*/   struct sym_lcbh head;

        /*
         *  Task table read from SCRIPTS that contains pointers to 
         *  ITLQ nexuses. The bus address read from SCRIPTS is 
         *  inside the header.
         */
        u32     *itlq_tbl;      /* Kernel virtual address       */

        /*
         *  Busy CCBs management.
         */
        u_short busy_itlq;      /* Number of busy tagged CCBs   */
        u_short busy_itl;       /* Number of busy untagged CCBs */

        /*
         *  Circular tag allocation buffer.
         */
        u_short ia_tag;         /* Tag allocation index         */
        u_short if_tag;         /* Tag release index            */
        u_char  *cb_tags;       /* Circular tags buffer         */

        /*
         *  O/S specific data structure.
         */
#ifdef  SYM_HAVE_SLCB
        struct sym_slcb s;
#endif

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
        /*
         *  Optionnaly the driver can handle device queueing, 
         *  and requeues internally command to redo.
         */
        SYM_QUEHEAD waiting_ccbq;
        SYM_QUEHEAD started_ccbq;
        int     num_sgood;
        u_short started_tags;
        u_short started_no_tag;
        u_short started_max;
        u_short started_limit;
#endif

#ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
        /*
         *  Optionally the driver can try to prevent SCSI 
         *  IOs from being reordered too much.
         */
        u_char          tags_si;        /* Current index to tags sum    */
        u_short         tags_sum[2];    /* Tags sum counters            */
        u_short         tags_since;     /* # of tags since last switch  */
#endif

        /*
         *  Set when we want to clear all tasks.
         */
        u_char to_clear;

        /*
         *  Capabilities.
         */
        u_char  user_flags;
        u_char  curr_flags;
};

/*
 *  Action from SCRIPTS on a task.
 *  Is part of the CCB, but is also used separately to plug 
 *  error handling action to perform from SCRIPTS.
 */
struct sym_actscr {
        u32     start;          /* Jumped by SCRIPTS after selection    */
        u32     restart;        /* Jumped by SCRIPTS on relection       */
};

/*
 *  Phase mismatch context.
 *
 *  It is part of the CCB and is used as parameters for the 
 *  DATA pointer. We need two contexts to handle correctly the 
 *  SAVED DATA POINTER.
 */
struct sym_pmc {
        struct  sym_tblmove sg; /* Updated interrupted SG block */
        u32     ret;            /* SCRIPT return address        */
};

/*
 *  LUN control block lookup.
 *  We use a direct pointer for LUN #0, and a table of 
 *  pointers which is only allocated for devices that support 
 *  LUN(s) > 0.
 */
#if SYM_CONF_MAX_LUN <= 1
#define sym_lp(tp, lun) (!lun) ? (tp)->lun0p : NULL
#else
#define sym_lp(tp, lun) \
        (!lun) ? (tp)->lun0p : (tp)->lunmp ? (tp)->lunmp[(lun)] : NULL
#endif

/*
 *  Status are used by the host and the script processor.
 *
 *  The last four bytes (status[4]) are copied to the 
 *  scratchb register (declared as scr0..scr3) just after the 
 *  select/reselect, and copied back just after disconnecting.
 *  Inside the script the XX_REG are used.
 */

/*
 *  Last four bytes (script)
 */
#define  HX_REG scr0
#define  HX_PRT nc_scr0
#define  HS_REG scr1
#define  HS_PRT nc_scr1
#define  SS_REG scr2
#define  SS_PRT nc_scr2
#define  HF_REG scr3
#define  HF_PRT nc_scr3

/*
 *  Last four bytes (host)
 */
#define  host_xflags   phys.head.status[0]
#define  host_status   phys.head.status[1]
#define  ssss_status   phys.head.status[2]
#define  host_flags    phys.head.status[3]

/*
 *  Host flags
 */
#define HF_IN_PM0       1u
#define HF_IN_PM1       (1u<<1)
#define HF_ACT_PM       (1u<<2)
#define HF_DP_SAVED     (1u<<3)
#define HF_SENSE        (1u<<4)
#define HF_EXT_ERR      (1u<<5)
#define HF_DATA_IN      (1u<<6)
#ifdef SYM_CONF_IARB_SUPPORT
#define HF_HINT_IARB    (1u<<7)
#endif

/*
 *  More host flags
 */
#if     SYM_CONF_DMA_ADDRESSING_MODE == 2
#define HX_DMAP_DIRTY   (1u<<7)
#endif

/*
 *  Global CCB HEADER.
 *
 *  Due to lack of indirect addressing on earlier NCR chips,
 *  this substructure is copied from the ccb to a global 
 *  address after selection (or reselection) and copied back 
 *  before disconnect.
 *  For SYMBIOS chips that support LOAD/STORE this copy is 
 *  not needed and thus not performed.
 */

struct sym_ccbh {
        /*
         *  Start and restart SCRIPTS addresses (must be at 0).
         */
/*0*/   struct sym_actscr go;

        /*
         *  SCRIPTS jump address that deal with data pointers.
         *  'savep' points to the position in the script responsible 
         *  for the actual transfer of data.
         *  It's written on reception of a SAVE_DATA_POINTER message.
         */
        u32     savep;          /* Jump address to saved data pointer   */
        u32     lastp;          /* SCRIPTS address at end of data       */
#ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
        u32     wlastp;
#endif

        /*
         *  Status fields.
         */
        u8      status[4];
};

/*
 *  GET/SET the value of the data pointer used by SCRIPTS.
 *
 *  We must distinguish between the LOAD/STORE-based SCRIPTS 
 *  that use directly the header in the CCB, and the NCR-GENERIC 
 *  SCRIPTS that use the copy of the header in the HCB.
 */
#if     SYM_CONF_GENERIC_SUPPORT
#define sym_set_script_dp(np, cp, dp)                           \
        do {                                                    \
                if (np->features & FE_LDSTR)                    \
                        cp->phys.head.lastp = cpu_to_scr(dp);   \
                else                                            \
                        np->ccb_head.lastp = cpu_to_scr(dp);    \
        } while (0)
#define sym_get_script_dp(np, cp)                               \
        scr_to_cpu((np->features & FE_LDSTR) ?                  \
                cp->phys.head.lastp : np->ccb_head.lastp)
#else
#define sym_set_script_dp(np, cp, dp)                           \
        do {                                                    \
                cp->phys.head.lastp = cpu_to_scr(dp);           \
        } while (0)

#define sym_get_script_dp(np, cp) (cp->phys.head.lastp)
#endif

/*
 *  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.
 */
struct sym_dsb {
        /*
         *  CCB header.
         *  Also assumed at offset 0 of the sym_ccb structure.
         */
/*0*/   struct sym_ccbh head;

        /*
         *  Phase mismatch contexts.
         *  We need two to handle correctly the SAVED DATA POINTER.
         *  MUST BOTH BE AT OFFSET < 256, due to using 8 bit arithmetic 
         *  for address calculation from SCRIPTS.
         */
        struct sym_pmc pm0;
        struct sym_pmc pm1;

        /*
         *  Table data for Script
         */
        struct sym_tblsel  select;
        struct sym_tblmove smsg;
        struct sym_tblmove smsg_ext;
        struct sym_tblmove cmd;
        struct sym_tblmove sense;
        struct sym_tblmove wresid;
        struct sym_tblmove data [SYM_CONF_MAX_SG];
};

/*
 *  Our Command Control Block
 */
struct sym_ccb {
        /*
         *  This is the data structure which is pointed by the DSA 
         *  register when it is executed by the script processor.
         *  It must be the first entry.
         */
        struct sym_dsb phys;

        /*
         *  Pointer to CAM ccb and related stuff.
         */
        struct scsi_cmnd *cmd;  /* CAM scsiio ccb               */
        u8      cdb_buf[16];    /* Copy of CDB                  */
#define SYM_SNS_BBUF_LEN 32
        u8      sns_bbuf[SYM_SNS_BBUF_LEN]; /* Bounce buffer for sense data */
        int     data_len;       /* Total data length            */
        int     segments;       /* Number of SG segments        */

        u8      order;          /* Tag type (if tagged command) */
        unsigned char odd_byte_adjustment;      /* odd-sized req on wide bus */

        u_char  nego_status;    /* Negotiation status           */
        u_char  xerr_status;    /* Extended error flags         */
        u32     extra_bytes;    /* Extraneous bytes transferred */

        /*
         *  Message areas.
         *  We prepare a message to be sent after selection.
         *  We may use a second one if the command is rescheduled 
         *  due to CHECK_CONDITION or COMMAND TERMINATED.
         *  Contents are IDENTIFY and SIMPLE_TAG.
         *  While negotiating sync or wide transfer,
         *  a SDTR or WDTR message is appended.
         */
        u_char  scsi_smsg [12];
        u_char  scsi_smsg2[12];

        /*
         *  Auto request sense related fields.
         */
        u_char  sensecmd[6];    /* Request Sense command        */
        u_char  sv_scsi_status; /* Saved SCSI status            */
        u_char  sv_xerr_status; /* Saved extended status        */
        int     sv_resid;       /* Saved residual               */

        /*
         *  Other fields.
         */
        u32     ccb_ba;         /* BUS address of this CCB      */
        u_short tag;            /* Tag for this transfer        */
                                /*  NO_TAG means no tag         */
        u_char  target;
        u_char  lun;
        struct sym_ccb *link_ccbh;      /* Host adapter CCB hash chain  */
        SYM_QUEHEAD link_ccbq;  /* Link to free/busy CCB queue  */
        u32     startp;         /* Initial data pointer         */
        u32     goalp;          /* Expected last data pointer   */
#ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
        u32     wgoalp;
#endif
        int     ext_sg;         /* Extreme data pointer, used   */
        int     ext_ofs;        /*  to calculate the residual.  */
#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
        SYM_QUEHEAD link2_ccbq; /* Link for device queueing     */
        u_char  started;        /* CCB queued to the squeue     */
#endif
        u_char  to_abort;       /* Want this IO to be aborted   */
#ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
        u_char  tags_si;        /* Lun tags sum index (0,1)     */
#endif
};

#define CCB_BA(cp,lbl)  cpu_to_scr(cp->ccb_ba + offsetof(struct sym_ccb, lbl))

#ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
#define sym_goalp(cp) ((cp->host_flags & HF_DATA_IN) ? cp->goalp : cp->wgoalp)
#else
#define sym_goalp(cp) (cp->goalp)
#endif

typedef struct device *m_pool_ident_t;

/*
 *  Host Control Block
 */
struct sym_hcb {
        /*
         *  Global headers.
         *  Due to poorness of addressing capabilities, earlier 
         *  chips (810, 815, 825) copy part of the data structures 
         *  (CCB, TCB and LCB) in fixed areas.
         */
#if     SYM_CONF_GENERIC_SUPPORT
        struct sym_ccbh ccb_head;
        struct sym_tcbh tcb_head;
        struct sym_lcbh lcb_head;
#endif
        /*
         *  Idle task and invalid task actions and 
         *  their bus addresses.
         */
        struct sym_actscr idletask, notask, bad_itl, bad_itlq;
        u32 idletask_ba, notask_ba, bad_itl_ba, bad_itlq_ba;

        /*
         *  Dummy lun table to protect us against target 
         *  returning bad lun number on reselection.
         */
        u32     *badluntbl;     /* Table physical address       */
        u32     badlun_sa;      /* SCRIPT handler BUS address   */

        /*
         *  Bus address of this host control block.
         */
        u32     hcb_ba;

        /*
         *  Bit 32-63 of the on-chip RAM bus address in LE format.
         *  The START_RAM64 script loads the MMRS and MMWS from this 
         *  field.
         */
        u32     scr_ram_seg;

        /*
         *  Initial value of some IO register bits.
         *  These values are assumed to have been set by BIOS, and may 
         *  be used to probe adapter implementation differences.
         */
        u_char  sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest3, sv_ctest4,
                sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4, sv_scntl4,
                sv_stest1;

        /*
         *  Actual initial value of IO register bits used by the 
         *  driver. They are loaded at initialisation according to  
         *  features that are to be enabled/disabled.
         */
        u_char  rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest3, rv_ctest4, 
                rv_ctest5, rv_stest2, rv_ccntl0, rv_ccntl1, rv_scntl4;

        /*
         *  Target data.
         */
        struct sym_tcb  target[SYM_CONF_MAX_TARGET];

        /*
         *  Target control block bus address array used by the SCRIPT 
         *  on reselection.
         */
        u32             *targtbl;
        u32             targtbl_ba;

        /*
         *  DMA pool handle for this HBA.
         */
        m_pool_ident_t  bus_dmat;

        /*
         *  O/S specific data structure
         */
        struct sym_shcb s;

        /*
         *  Physical bus addresses of the chip.
         */
        u32             mmio_ba;        /* MMIO 32 bit BUS address      */
        int             mmio_ws;        /* MMIO Window size             */

        u32             ram_ba;         /* RAM 32 bit BUS address       */
        int             ram_ws;         /* RAM window size              */

        /*
         *  SCRIPTS virtual and physical bus addresses.
         *  'script'  is loaded in the on-chip RAM if present.
         *  'scripth' stays in main memory for all chips except the 
         *  53C895A, 53C896 and 53C1010 that provide 8K on-chip RAM.
         */
        u_char          *scripta0;      /* Copy of scripts A, B, Z      */
        u_char          *scriptb0;
        u_char          *scriptz0;
        u32             scripta_ba;     /* Actual scripts A, B, Z       */
        u32             scriptb_ba;     /* 32 bit bus addresses.        */
        u32             scriptz_ba;
        u_short         scripta_sz;     /* Actual size of script A, B, Z*/
        u_short         scriptb_sz;
        u_short         scriptz_sz;

        /*
         *  Bus addresses, setup and patch methods for 
         *  the selected firmware.
         */
        struct sym_fwa_ba fwa_bas;      /* Useful SCRIPTA bus addresses */
        struct sym_fwb_ba fwb_bas;      /* Useful SCRIPTB bus addresses */
        struct sym_fwz_ba fwz_bas;      /* Useful SCRIPTZ bus addresses */
        void            (*fw_setup)(struct sym_hcb *np, struct sym_fw *fw);
        void            (*fw_patch)(struct sym_hcb *np);
        char            *fw_name;

        /*
         *  General controller parameters and configuration.
         */
        u_short device_id;      /* PCI device id                */
        u_char  revision_id;    /* PCI device revision id       */
        u_int   features;       /* Chip features map            */
        u_char  myaddr;         /* SCSI id of the adapter       */
        u_char  maxburst;       /* log base 2 of dwords burst   */
        u_char  maxwide;        /* Maximum transfer width       */
        u_char  minsync;        /* Min sync period factor (ST)  */
        u_char  maxsync;        /* Max sync period factor (ST)  */
        u_char  maxoffs;        /* Max scsi offset        (ST)  */
        u_char  minsync_dt;     /* Min sync period factor (DT)  */
        u_char  maxsync_dt;     /* Max sync period factor (DT)  */
        u_char  maxoffs_dt;     /* Max scsi offset        (DT)  */
        u_char  multiplier;     /* Clock multiplier (1,2,4)     */
        u_char  clock_divn;     /* Number of clock divisors     */
        u32     clock_khz;      /* SCSI clock frequency in KHz  */
        u32     pciclk_khz;     /* Estimated PCI clock  in KHz  */
        /*
         *  Start queue management.
         *  It is filled up by the host processor and accessed by the 
         *  SCRIPTS processor in order to start SCSI commands.
         */
        volatile                /* Prevent code optimizations   */
        u32     *squeue;        /* Start queue virtual address  */
        u32     squeue_ba;      /* Start queue BUS address      */
        u_short squeueput;      /* Next free slot of the queue  */
        u_short actccbs;        /* Number of allocated CCBs     */

        /*
         *  Command completion queue.
         *  It is the same size as the start queue to avoid overflow.
         */
        u_short dqueueget;      /* Next position to scan        */
        volatile                /* Prevent code optimizations   */
        u32     *dqueue;        /* Completion (done) queue      */
        u32     dqueue_ba;      /* Done queue BUS address       */

        /*
         *  Miscellaneous buffers accessed by the scripts-processor.
         *  They shall be DWORD aligned, because they may be read or 
         *  written with a script command.
         */
        u_char          msgout[8];      /* Buffer for MESSAGE OUT       */
        u_char          msgin [8];      /* Buffer for MESSAGE IN        */
        u32             lastmsg;        /* Last SCSI message sent       */
        u32             scratch;        /* Scratch for SCSI receive     */
                                        /* Also used for cache test     */
        /*
         *  Miscellaneous configuration and status parameters.
         */
        u_char          usrflags;       /* Miscellaneous user flags     */
        u_char          scsi_mode;      /* Current SCSI BUS mode        */
        u_char          verbose;        /* Verbosity for this controller*/

        /*
         *  CCB lists and queue.
         */
        struct sym_ccb **ccbh;                  /* CCBs hashed by DSA value     */
                                        /* CCB_HASH_SIZE lists of CCBs  */
        SYM_QUEHEAD     free_ccbq;      /* Queue of available CCBs      */
        SYM_QUEHEAD     busy_ccbq;      /* Queue of busy CCBs           */

        /*
         *  During error handling and/or recovery,
         *  active CCBs that are to be completed with 
         *  error or requeued are moved from the busy_ccbq
         *  to the comp_ccbq prior to completion.
         */
        SYM_QUEHEAD     comp_ccbq;

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
        SYM_QUEHEAD     dummy_ccbq;
#endif

        /*
         *  IMMEDIATE ARBITRATION (IARB) control.
         *
         *  We keep track in 'last_cp' of the last CCB that has been 
         *  queued to the SCRIPTS processor and clear 'last_cp' when 
         *  this CCB completes. If last_cp is not zero at the moment 
         *  we queue a new CCB, we set a flag in 'last_cp' that is 
         *  used by the SCRIPTS as a hint for setting IARB.
         *  We donnot set more than 'iarb_max' consecutive hints for 
         *  IARB in order to leave devices a chance to reselect.
         *  By the way, any non zero value of 'iarb_max' is unfair. :)
         */
#ifdef SYM_CONF_IARB_SUPPORT
        u_short         iarb_max;       /* Max. # consecutive IARB hints*/
        u_short         iarb_count;     /* Actual # of these hints      */
        struct sym_ccb *        last_cp;
#endif

        /*
         *  Command abort handling.
         *  We need to synchronize tightly with the SCRIPTS 
         *  processor in order to handle things correctly.
         */
        u_char          abrt_msg[4];    /* Message to send buffer       */
        struct sym_tblmove abrt_tbl;    /* Table for the MOV of it      */
        struct sym_tblsel  abrt_sel;    /* Sync params for selection    */
        u_char          istat_sem;      /* Tells the chip to stop (SEM) */

        /*
         *  64 bit DMA handling.
         */
#if     SYM_CONF_DMA_ADDRESSING_MODE != 0
        u_char  use_dac;                /* Use PCI DAC cycles           */
#if     SYM_CONF_DMA_ADDRESSING_MODE == 2
        u_char  dmap_dirty;             /* Dma segments registers dirty */
        u32     dmap_bah[SYM_DMAP_SIZE];/* Segment registers map        */
#endif
#endif
};

#define HCB_BA(np, lbl) (np->hcb_ba + offsetof(struct sym_hcb, lbl))


/*
 *  FIRMWARES (sym_fw.c)
 */
struct sym_fw * sym_find_firmware(struct sym_chip *chip);
void sym_fw_bind_script(struct sym_hcb *np, u32 *start, int len);

/*
 *  Driver methods called from O/S specific code.
 */
char *sym_driver_name(void);
void sym_print_xerr(struct scsi_cmnd *cmd, int x_status);
int sym_reset_scsi_bus(struct sym_hcb *np, int enab_int);
struct sym_chip *sym_lookup_chip_table(u_short device_id, u_char revision);
#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
void sym_start_next_ccbs(struct sym_hcb *np, struct sym_lcb *lp, int maxn);
#endif
void sym_start_up(struct sym_hcb *np, int reason);
void sym_interrupt(struct sym_hcb *np);
int sym_clear_tasks(struct sym_hcb *np, int cam_status, int target, int lun, int task);
struct sym_ccb *sym_get_ccb(struct sym_hcb *np, struct scsi_cmnd *cmd, u_char tag_order);
void sym_free_ccb(struct sym_hcb *np, struct sym_ccb *cp);
struct sym_lcb *sym_alloc_lcb(struct sym_hcb *np, u_char tn, u_char ln);
int sym_queue_scsiio(struct sym_hcb *np, struct scsi_cmnd *csio, struct sym_ccb *cp);
int sym_abort_scsiio(struct sym_hcb *np, struct scsi_cmnd *ccb, int timed_out);
int sym_reset_scsi_target(struct sym_hcb *np, int target);
void sym_hcb_free(struct sym_hcb *np);
int sym_hcb_attach(struct Scsi_Host *shost, struct sym_fw *fw, struct sym_nvram *nvram);

/*
 *  Build a scatter/gather entry.
 *
 *  For 64 bit systems, we use the 8 upper bits of the size field 
 *  to provide bus address bits 32-39 to the SCRIPTS processor.
 *  This allows the 895A, 896, 1010 to address up to 1 TB of memory.
 */

#if   SYM_CONF_DMA_ADDRESSING_MODE == 0
#define sym_build_sge(np, data, badd, len)      \
do {                                            \
        (data)->addr = cpu_to_scr(badd);        \
        (data)->size = cpu_to_scr(len);         \
} while (0)
#elif SYM_CONF_DMA_ADDRESSING_MODE == 1
#define sym_build_sge(np, data, badd, len)                              \
do {                                                                    \
        (data)->addr = cpu_to_scr(badd);                                \
        (data)->size = cpu_to_scr((((badd) >> 8) & 0xff000000) + len);  \
} while (0)
#elif SYM_CONF_DMA_ADDRESSING_MODE == 2
int sym_lookup_dmap(struct sym_hcb *np, u32 h, int s);
static __inline void 
sym_build_sge(struct sym_hcb *np, struct sym_tblmove *data, u64 badd, int len)
{
        u32 h = (badd>>32);
        int s = (h&SYM_DMAP_MASK);

        if (h != np->dmap_bah[s])
                goto bad;
good:
        (data)->addr = cpu_to_scr(badd);
        (data)->size = cpu_to_scr((s<<24) + len);
        return;
bad:
        s = sym_lookup_dmap(np, h, s);
        goto good;
}
#else
#error "Unsupported DMA addressing mode"
#endif

/*
 *  Set up data pointers used by SCRIPTS.
 *  Called from O/S specific code.
 */
static inline void sym_setup_data_pointers(struct sym_hcb *np,
                struct sym_ccb *cp, int dir)
{
        u32 lastp, goalp;

        /*
         *  No segments means no data.
         */
        if (!cp->segments)
                dir = DMA_NONE;

        /*
         *  Set the data pointer.
         */
        switch(dir) {
#ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
        case DMA_BIDIRECTIONAL:
#endif
        case DMA_TO_DEVICE:
                goalp = SCRIPTA_BA(np, data_out2) + 8;
                lastp = goalp - 8 - (cp->segments * (2*4));
#ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
                cp->wgoalp = cpu_to_scr(goalp);
                if (dir != DMA_BIDIRECTIONAL)
                        break;
                cp->phys.head.wlastp = cpu_to_scr(lastp);
                /* fall through */
#else
                break;
#endif
        case DMA_FROM_DEVICE:
                cp->host_flags |= HF_DATA_IN;
                goalp = SCRIPTA_BA(np, data_in2) + 8;
                lastp = goalp - 8 - (cp->segments * (2*4));
                break;
        case DMA_NONE:
        default:
#ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
                cp->host_flags |= HF_DATA_IN;
#endif
                lastp = goalp = SCRIPTB_BA(np, no_data);
                break;
        }

        /*
         *  Set all pointers values needed by SCRIPTS.
         */
        cp->phys.head.lastp = cpu_to_scr(lastp);
        cp->phys.head.savep = cpu_to_scr(lastp);
        cp->startp          = cp->phys.head.savep;
        cp->goalp           = cpu_to_scr(goalp);

#ifdef  SYM_OPT_HANDLE_DIR_UNKNOWN
        /*
         *  If direction is unknown, start at data_io.
         */
        if (dir == DMA_BIDIRECTIONAL)
                cp->phys.head.savep = cpu_to_scr(SCRIPTB_BA(np, data_io));
#endif
}

/*
 *  MEMORY ALLOCATOR.
 */

#define sym_get_mem_cluster()   \
        (void *) __get_free_pages(GFP_ATOMIC, SYM_MEM_PAGE_ORDER)
#define sym_free_mem_cluster(p) \
        free_pages((unsigned long)p, SYM_MEM_PAGE_ORDER)

/*
 *  Link between free memory chunks of a given size.
 */
typedef struct sym_m_link {
        struct sym_m_link *next;
} *m_link_p;

/*
 *  Virtual to bus physical translation for a given cluster.
 *  Such a structure is only useful with DMA abstraction.
 */
typedef struct sym_m_vtob {     /* Virtual to Bus address translation */
        struct sym_m_vtob *next;
        void *vaddr;            /* Virtual address */
        dma_addr_t baddr;       /* Bus physical address */
} *m_vtob_p;

/* Hash this stuff a bit to speed up translations */
#define VTOB_HASH_SHIFT         5
#define VTOB_HASH_SIZE          (1UL << VTOB_HASH_SHIFT)
#define VTOB_HASH_MASK          (VTOB_HASH_SIZE-1)
#define VTOB_HASH_CODE(m)       \
        ((((unsigned long)(m)) >> SYM_MEM_CLUSTER_SHIFT) & VTOB_HASH_MASK)

/*
 *  Memory pool of a given kind.
 *  Ideally, we want to use:
 *  1) 1 pool for memory we donnot need to involve in DMA.
 *  2) The same pool for controllers that require same DMA 
 *     constraints and features.
 *     The OS specific m_pool_id_t thing and the sym_m_pool_match() 
 *     method are expected to tell the driver about.
 */
typedef struct sym_m_pool {
        m_pool_ident_t  dev_dmat;       /* Identifies the pool (see above) */
        void * (*get_mem_cluster)(struct sym_m_pool *);
#ifdef  SYM_MEM_FREE_UNUSED
        void (*free_mem_cluster)(struct sym_m_pool *, void *);
#endif
#define M_GET_MEM_CLUSTER()             mp->get_mem_cluster(mp)
#define M_FREE_MEM_CLUSTER(p)           mp->free_mem_cluster(mp, p)
        int nump;
        m_vtob_p vtob[VTOB_HASH_SIZE];
        struct sym_m_pool *next;
        struct sym_m_link h[SYM_MEM_CLUSTER_SHIFT - SYM_MEM_SHIFT + 1];
} *m_pool_p;

/*
 *  Alloc, free and translate addresses to bus physical 
 *  for DMAable memory.
 */
void *__sym_calloc_dma(m_pool_ident_t dev_dmat, int size, char *name);
void __sym_mfree_dma(m_pool_ident_t dev_dmat, void *m, int size, char *name);
dma_addr_t __vtobus(m_pool_ident_t dev_dmat, void *m);

/*
 * Verbs used by the driver code for DMAable memory handling.
 * The _uvptv_ macro avoids a nasty warning about pointer to volatile 
 * being discarded.
 */
#define _uvptv_(p) ((void *)((u_long)(p)))

#define _sym_calloc_dma(np, l, n)       __sym_calloc_dma(np->bus_dmat, l, n)
#define _sym_mfree_dma(np, p, l, n)     \
                        __sym_mfree_dma(np->bus_dmat, _uvptv_(p), l, n)
#define sym_calloc_dma(l, n)            _sym_calloc_dma(np, l, n)
#define sym_mfree_dma(p, l, n)          _sym_mfree_dma(np, p, l, n)
#define vtobus(p)                       __vtobus(np->bus_dmat, _uvptv_(p))

/*
 *  We have to provide the driver memory allocator with methods for 
 *  it to maintain virtual to bus physical address translations.
 */

#define sym_m_pool_match(mp_id1, mp_id2)        (mp_id1 == mp_id2)

static __inline void *sym_m_get_dma_mem_cluster(m_pool_p mp, m_vtob_p vbp)
{
        void *vaddr = NULL;
        dma_addr_t baddr = 0;

        vaddr = dma_alloc_coherent(mp->dev_dmat, SYM_MEM_CLUSTER_SIZE, &baddr,
                        GFP_ATOMIC);
        if (vaddr) {
                vbp->vaddr = vaddr;
                vbp->baddr = baddr;
        }
        return vaddr;
}

static __inline void sym_m_free_dma_mem_cluster(m_pool_p mp, m_vtob_p vbp)
{
        dma_free_coherent(mp->dev_dmat, SYM_MEM_CLUSTER_SIZE, vbp->vaddr,
                        vbp->baddr);
}

#endif /* SYM_HIPD_H */