/*
 *      eata.c - Low-level driver for EATA/DMA SCSI host adapters.
 *
 *      18 Apr 1998 Rev. 4.20 for linux 2.0.33 and 2.1.97
 *          Reworked interrupt handler.
 *
 *      11 Apr 1998 rev. 4.05 for linux 2.0.33 and 2.1.95
 *          Major reliability improvement: when a batch with overlapping
 *          requests is detected, requests are queued one at a time
 *          eliminating any possible board or drive reordering.
 *
 *      10 Apr 1998 rev. 4.04 for linux 2.0.33 and 2.1.95
 *          Improved SMP support (if linux version >= 2.1.95).
 *
 *       9 Apr 1998 rev. 4.03 for linux 2.0.33 and 2.1.94
 *          Added support for new PCI code and IO-APIC remapping of irqs.
 *          Performance improvement: when sequential i/o is detected,
 *          always use direct sort instead of reverse sort.
 *
 *       4 Apr 1998 rev. 4.02 for linux 2.0.33 and 2.1.92
 *          io_port is now unsigned long.
 *
 *      17 Mar 1998 rev. 4.01 for linux 2.0.33 and 2.1.88
 *          Use new scsi error handling code (if linux version >= 2.1.88).
 *          Use new interrupt code.
 *
 *      12 Sep 1997 rev. 3.11 for linux 2.0.30 and 2.1.55
 *          Use of udelay inside the wait loops to avoid timeout
 *          problems with fast cpus.
 *          Removed check about useless calls to the interrupt service
 *          routine (reported on SMP systems only).
 *          At initialization time "sorted/unsorted" is displayed instead
 *          of "linked/unlinked" to reinforce the fact that "linking" is
 *          nothing but "elevator sorting" in the actual implementation.
 *
 *      17 May 1997 rev. 3.10 for linux 2.0.30 and 2.1.38
 *          Use of serial_number_at_timeout in abort and reset processing.
 *          Use of the __initfunc and __initdata macro in setup code.
 *          Minor cleanups in the list_statistics code.
 *          Increased controller busy timeout in order to better support
 *          slow SCSI devices.
 *
 *      24 Feb 1997 rev. 3.00 for linux 2.0.29 and 2.1.26
 *          When loading as a module, parameter passing is now supported
 *          both in 2.0 and in 2.1 style.
 *          Fixed data transfer direction for some SCSI opcodes.
 *          Immediate acknowledge to request sense commands.
 *          Linked commands to each disk device are now reordered by elevator
 *          sorting. Rare cases in which reordering of write requests could
 *          cause wrong results are managed.
 *          Fixed spurious timeouts caused by long simple queue tag sequences.
 *          New command line option (tm:[0-3]) to choose the type of tags:
 *          0 -> mixed (default); 1 -> simple; 2 -> head; 3 -> ordered.
 *
 *      18 Jan 1997 rev. 2.60 for linux 2.1.21 and 2.0.28
 *          Added command line options to enable/disable linked commands
 *          (lc:[y|n]), tagged commands (tc:[y|n]) and to set the max queue
 *          depth (mq:xx). Default is "eata=lc:n,tc:n,mq:16".
 *          Improved command linking.
 *          Documented how to setup RAID-0 with DPT SmartRAID boards.
 *
 *       8 Jan 1997 rev. 2.50 for linux 2.1.20 and 2.0.27
 *          Added linked command support.
 *          Improved detection of PCI boards using ISA base addresses.
 *
 *       3 Dec 1996 rev. 2.40 for linux 2.1.14 and 2.0.27
 *          Added support for tagged commands and queue depth adjustment.
 *
 *      22 Nov 1996 rev. 2.30 for linux 2.1.12 and 2.0.26
 *          When CONFIG_PCI is defined, BIOS32 is used to include in the
 *          list of i/o ports to be probed all the PCI SCSI controllers.
 *          The list of i/o ports to be probed can be overwritten by the
 *          "eata=port0,port1,...." boot command line option.
 *          Scatter/gather lists are now allocated by a number of kmalloc
 *          calls, in order to avoid the previous size limit of 64Kb.
 *
 *      16 Nov 1996 rev. 2.20 for linux 2.1.10 and 2.0.25
 *          Added support for EATA 2.0C, PCI, multichannel and wide SCSI.
 *
 *      27 Sep 1996 rev. 2.12 for linux 2.1.0
 *          Portability cleanups (virtual/bus addressing, little/big endian
 *          support).
 *
 *      09 Jul 1996 rev. 2.11 for linux 2.0.4
 *          Number of internal retries is now limited.
 *
 *      16 Apr 1996 rev. 2.10 for linux 1.3.90
 *          New argument "reset_flags" to the reset routine.
 *
 *       6 Jul 1995 rev. 2.01 for linux 1.3.7
 *          Update required by the new /proc/scsi support.
 *
 *      11 Mar 1995 rev. 2.00 for linux 1.2.0
 *          Fixed a bug which prevented media change detection for removable
 *          disk drives.
 *
 *      23 Feb 1995 rev. 1.18 for linux 1.1.94
 *          Added a check for scsi_register returning NULL.
 *
 *      11 Feb 1995 rev. 1.17 for linux 1.1.91
 *          Now DEBUG_RESET is disabled by default.
 *          Register a board even if it does not assert DMA protocol support
 *          (DPT SK2011B does not report correctly the dmasup bit).
 *
 *       9 Feb 1995 rev. 1.16 for linux 1.1.90
 *          Use host->wish_block instead of host->block.
 *          New list of Data Out SCSI commands.
 *
 *       8 Feb 1995 rev. 1.15 for linux 1.1.89
 *          Cleared target_time_out counter while performing a reset.
 *          All external symbols renamed to avoid possible name conflicts.
 *
 *      28 Jan 1995 rev. 1.14 for linux 1.1.86
 *          Added module support.
 *          Log and do a retry when a disk drive returns a target status
 *          different from zero on a recovered error.
 *
 *      24 Jan 1995 rev. 1.13 for linux 1.1.85
 *          Use optimized board configuration, with a measured performance
 *          increase in the range 10%-20% on i/o throughput.
 *
 *      16 Jan 1995 rev. 1.12 for linux 1.1.81
 *          Fix mscp structure comments (no functional change).
 *          Display a message if check_region detects a port address
 *          already in use.
 *
 *      17 Dec 1994 rev. 1.11 for linux 1.1.74
 *          Use the scsicam_bios_param routine. This allows an easy
 *          migration path from disk partition tables created using
 *          different SCSI drivers and non optimal disk geometry.
 *
 *      15 Dec 1994 rev. 1.10 for linux 1.1.74
 *          Added support for ISA EATA boards (DPT PM2011, DPT PM2021).
 *          The host->block flag is set for all the detected ISA boards.
 *          The detect routine no longer enforces LEVEL triggering
 *          for EISA boards, it just prints a warning message.
 *
 *      30 Nov 1994 rev. 1.09 for linux 1.1.68
 *          Redo i/o on target status CHECK_CONDITION for TYPE_DISK only.
 *          Added optional support for using a single board at a time.
 *
 *      18 Nov 1994 rev. 1.08 for linux 1.1.64
 *          Forces sg_tablesize = 64 and can_queue = 64 if these
 *          values are not correctly detected (DPT PM2012).
 *
 *      14 Nov 1994 rev. 1.07 for linux 1.1.63  Final BETA release.
 *      04 Aug 1994 rev. 1.00 for linux 1.1.39  First BETA release.
 *
 *
 *          This driver is based on the CAM (Common Access Method Committee)
 *          EATA (Enhanced AT Bus Attachment) rev. 2.0A, using DMA protocol.
 *
 *  Copyright (C) 1994-1998 Dario Ballabio (dario@milano.europe.dg.com)
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that redistributions of source
 *  code retain the above copyright notice and this comment without
 *  modification.
 *
 */

/*
 *
 *  Here is a brief description of the DPT SCSI host adapters.
 *  All these boards provide an EATA/DMA compatible programming interface
 *  and are fully supported by this driver in any configuration, including
 *  multiple SCSI channels:
 *
 *  PM2011B/9X -  Entry Level ISA
 *  PM2021A/9X -  High Performance ISA
 *  PM2012A       Old EISA
 *  PM2012B       Old EISA
 *  PM2022A/9X -  Entry Level EISA
 *  PM2122A/9X -  High Performance EISA
 *  PM2322A/9X -  Extra High Performance EISA
 *  PM3021     -  SmartRAID Adapter for ISA
 *  PM3222     -  SmartRAID Adapter for EISA (PM3222W is 16-bit wide SCSI)
 *  PM3224     -  SmartRAID Adapter for PCI  (PM3224W is 16-bit wide SCSI)
 *
 *  The DPT PM2001 provides only the EATA/PIO interface and hence is not
 *  supported by this driver.
 *
 *  This code has been tested with up to 3 Distributed Processing Technology
 *  PM2122A/9X (DPT SCSI BIOS v002.D1, firmware v05E.0) EISA controllers,
 *  in any combination of private and shared IRQ.
 *  PCI support has been tested using up to 2 DPT PM3224W (DPT SCSI BIOS
 *  v003.D0, firmware v07G.0).
 *
 *  DPT SmartRAID boards support "Hardware Array" - a group of disk drives
 *  which are all members of the same RAID-0, RAID-1 or RAID-5 array implemented
 *  in host adapter hardware. Hardware Arrays are fully compatible with this
 *  driver, since they look to it as a single disk drive.
 *
 *  WARNING: to create a RAID-0 "Hardware Array" you must select "Other Unix"
 *  as the current OS in the DPTMGR "Initial System Installation" menu.
 *  Otherwise RAID-0 is generated as an "Array Group" (i.e. software RAID-0),
 *  which is not supported by the actual SCSI subsystem.
 *  To get the "Array Group" functionality, the Linux MD driver must be used
 *  instead of the DPT "Array Group" feature.
 *
 *  Multiple ISA, EISA and PCI boards can be configured in the same system.
 *  It is suggested to put all the EISA boards on the same IRQ level, all
 *  the PCI  boards on another IRQ level, while ISA boards cannot share
 *  interrupts.
 *
 *  If you configure multiple boards on the same IRQ, the interrupt must
 *  be _level_ triggered (not _edge_ triggered).
 *
 *  This driver detects EATA boards by probes at fixed port addresses,
 *  so no BIOS32 or PCI BIOS support is required.
 *  The suggested way to detect a generic EATA PCI board is to force on it
 *  any unused EISA address, even if there are other controllers on the EISA
 *  bus, or even if you system has no EISA bus at all.
 *  Do not force any ISA address on EATA PCI boards.
 *
 *  If PCI bios support is configured into the kernel, BIOS32 is used to
 *  include in the list of i/o ports to be probed all the PCI SCSI controllers.
 *
 *  Due to a DPT BIOS "feature", it might not be possible to force an EISA
 *  address on more then a single DPT PCI board, so in this case you have to
 *  let the PCI BIOS assign the addresses.
 *
 *  The sequence of detection probes is:
 *
 *  - ISA 0x1F0;
 *  - PCI SCSI controllers (only if BIOS32 is available);
 *  - EISA/PCI 0x1C88 through 0xFC88 (corresponding to EISA slots 1 to 15);
 *  - ISA  0x170, 0x230, 0x330.
 *
 *  The above list of detection probes can be totally replaced by the
 *  boot command line option: "eata=port0,port1,port2,...", where the
 *  port0, port1... arguments are ISA/EISA/PCI addresses to be probed.
 *  For example using "eata=0x7410,0x7450,0x230", the driver probes
 *  only the two PCI addresses 0x7410 and 0x7450 and the ISA address 0x230,
 *  in this order; "eata=0" totally disables this driver.
 *
 *  After the optional list of detection probes, other possible command line
 *  options are:
 *
 *  lc:y  enables linked commands;
 *  lc:n  disables linked commands;
 *  tc:y  enables tagged commands;
 *  tc:n  disables tagged commands;
 *  tm:0  use head/simple/ordered queue tag sequences;
 *  tm:1  use only simple queue tags;
 *  tm:2  use only head of queue tags;
 *  tm:3  use only ordered queue tags;
 *  mq:xx set the max queue depth to the value xx (2 <= xx <= 32).
 *
 *  The default value is: "eata=lc:n,tc:n,mq:16,tm:0". An example using
 *  the list of detection probes could be: "eata=0x7410,0x230,lc:y,tc:n,mq:4".
 *
 *  When loading as a module, parameters can be specified as well.
 *  The above example would be (use 1 in place of y and 0 in place of n):
 *
 *  modprobe eata io_port=0x7410,0x230 linked_comm=1 tagged_comm=0 \
 *                max_queue_depth=4 tag_mode=0
 *
 *  ----------------------------------------------------------------------------
 *  In this implementation, linked commands are designed to work with any DISK
 *  or CD-ROM, since this linking has only the intent of clustering (time-wise)
 *  and reordering by elevator sorting commands directed to each device,
 *  without any relation with the actual SCSI protocol between the controller
 *  and the device.
 *  If Q is the queue depth reported at boot time for each device (also named
 *  cmds/lun) and Q > 2, whenever there is already an active command to the
 *  device all other commands to the same device  (up to Q-1) are kept waiting
 *  in the elevator sorting queue. When the active command completes, the
 *  commands in this queue are sorted by sector address. The sort is chosen
 *  between increasing or decreasing by minimizing the seek distance between
 *  the sector of the commands just completed and the sector of the first
 *  command in the list to be sorted.
 *  Trivial math assures that the unsorted average seek distance when doing
 *  random seeks over S sectors is S/3.
 *  When (Q-1) requests are uniformly distributed over S sectors, the average
 *  distance between two adjacent requests is S/((Q-1) + 1), so the sorted
 *  average seek distance for (Q-1) random requests over S sectors is S/Q.
 *  The elevator sorting hence divides the seek distance by a factor Q/3.
 *  The above pure geometric remarks are valid in all cases and the
 *  driver effectively reduces the seek distance by the predicted factor
 *  when there are Q concurrent read i/o operations on the device, but this
 *  does not necessarily results in a noticeable performance improvement:
 *  your mileage may vary....
 *
 *  Note: command reordering inside a batch of queued commands could cause
 *        wrong results only if there is at least one write request and the
 *        intersection (sector-wise) of all requests is not empty.
 *        When the driver detects a batch including overlapping requests
 *        (a really rare event) strict serial (pid) order is enforced.
 *  ----------------------------------------------------------------------------
 *
 *  The boards are named EATA0, EATA1,... according to the detection order.
 *
 *  In order to support multiple ISA boards in a reliable way,
 *  the driver sets host->wish_block = TRUE for all ISA boards.
 */

#include <linux/version.h>

#define LinuxVersionCode(v, p, s) (((v)<<16)+((p)<<8)+(s))
#define MAX_INT_PARAM 10

#if defined(MODULE)
#include <linux/module.h>

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,26)
MODULE_PARM(io_port, "1-" __MODULE_STRING(MAX_INT_PARAM) "i");
MODULE_PARM(linked_comm, "i");
MODULE_PARM(tagged_comm, "i");
MODULE_PARM(link_statistics, "i");
MODULE_PARM(max_queue_depth, "i");
MODULE_PARM(tag_mode, "i");
MODULE_AUTHOR("Dario Ballabio");
#endif

#endif

#include <linux/string.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/byteorder.h>

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,95)
#include <asm/spinlock.h>
#endif

#include <linux/proc_fs.h>
#include <linux/blk.h>
#include "scsi.h"
#include "hosts.h"
#include "sd.h"
#include <asm/dma.h>
#include <asm/irq.h>
#include "eata.h"
#include <linux/stat.h>
#include <linux/config.h>
#include <linux/pci.h>

#if LINUX_VERSION_CODE < LinuxVersionCode(2,1,93)
#include <linux/bios32.h>
#endif

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,36)
#include <linux/init.h>
#else
#define __initfunc(A) A
#define __initdata
#define __init
#endif

struct proc_dir_entry proc_scsi_eata2x = {
    PROC_SCSI_EATA2X, 6, "eata2x",
    S_IFDIR | S_IRUGO | S_IXUGO, 2
};

/* Subversion values */
#define ISA  0
#define ESA 1

#undef FORCE_CONFIG

#undef  DEBUG_LINKED_COMMANDS
#undef  DEBUG_DETECT
#undef  DEBUG_PCI_DETECT
#undef  DEBUG_INTERRUPT
#undef  DEBUG_RESET

#define MAX_ISA 4
#define MAX_VESA 0
#define MAX_EISA 15
#define MAX_PCI 16
#define MAX_BOARDS (MAX_ISA + MAX_VESA + MAX_EISA + MAX_PCI)
#define MAX_CHANNEL 4
#define MAX_LUN 32
#define MAX_TARGET 32
#define MAX_MAILBOXES 64
#define MAX_SGLIST 64
#define MAX_LARGE_SGLIST 122
#define MAX_INTERNAL_RETRIES 64
#define MAX_CMD_PER_LUN 2
#define MAX_TAGGED_CMD_PER_LUN (MAX_MAILBOXES - MAX_CMD_PER_LUN)

#define SKIP ULONG_MAX
#define FALSE 0
#define TRUE 1
#define FREE 0
#define IN_USE   1
#define LOCKED   2
#define IN_RESET 3
#define IGNORE   4
#define READY    5
#define ABORTING 6
#define NO_DMA  0xff
#define MAXLOOP  10000
#define TAG_MIXED    0
#define TAG_SIMPLE   1
#define TAG_HEAD     2
#define TAG_ORDERED  3

#define REG_CMD         7
#define REG_STATUS      7
#define REG_AUX_STATUS  8
#define REG_DATA        0
#define REG_DATA2       1
#define REG_SEE         6
#define REG_LOW         2
#define REG_LM          3
#define REG_MID         4
#define REG_MSB         5
#define REGION_SIZE     9
#define MAX_ISA_ADDR    0x03ff
#define MIN_EISA_ADDR   0x1c88
#define MAX_EISA_ADDR   0xfc88
#define BSY_ASSERTED      0x80
#define DRQ_ASSERTED      0x08
#define ABSY_ASSERTED     0x01
#define IRQ_ASSERTED      0x02
#define READ_CONFIG_PIO   0xf0
#define SET_CONFIG_PIO    0xf1
#define SEND_CP_PIO       0xf2
#define RECEIVE_SP_PIO    0xf3
#define TRUNCATE_XFR_PIO  0xf4
#define RESET_PIO         0xf9
#define READ_CONFIG_DMA   0xfd
#define SET_CONFIG_DMA    0xfe
#define SEND_CP_DMA       0xff
#define ASOK              0x00
#define ASST              0x01

#define ARRAY_SIZE(arr) (sizeof (arr) / sizeof (arr)[0])
#define YESNO(a) ((a) ? 'y' : 'n')
#define TLDEV(type) ((type) == TYPE_DISK || (type) == TYPE_ROM)

/* "EATA", in Big Endian format */
#define EATA_SIGNATURE 0x41544145

/* Number of valid bytes in the board config structure for EATA 2.0x */
#define EATA_2_0A_SIZE 28
#define EATA_2_0B_SIZE 30
#define EATA_2_0C_SIZE 34

/* Board info structure */
struct eata_info {
   ulong  data_len;     /* Number of valid bytes after this field */
   ulong  sign;         /* ASCII "EATA" signature */
   unchar        :4,    /* unused low nibble */
          version:4;    /* EATA version, should be 0x1 */
   unchar  ocsena:1,    /* Overlap Command Support Enabled */
           tarsup:1,    /* Target Mode Supported */
           trnxfr:1,    /* Truncate Transfer Cmd NOT Necessary */
           morsup:1,    /* More Supported */
           dmasup:1,    /* DMA Supported */
           drqvld:1,    /* DRQ Index (DRQX) is valid */
              ata:1,    /* This is an ATA device */
           haaval:1;    /* Host Adapter Address Valid */
   ushort cp_pad_len;   /* Number of pad bytes after cp_len */
   unchar host_addr[4]; /* Host Adapter SCSI ID for channels 3, 2, 1, 0 */
   ulong  cp_len;       /* Number of valid bytes in cp */
   ulong  sp_len;       /* Number of valid bytes in sp */
   ushort queue_size;   /* Max number of cp that can be queued */
   ushort unused;
   ushort scatt_size;   /* Max number of entries in scatter/gather table */
   unchar     irq:4,    /* Interrupt Request assigned to this controller */
           irq_tr:1,    /* 0 for edge triggered, 1 for level triggered */
           second:1,    /* 1 if this is a secondary (not primary) controller */
             drqx:2;    /* DRQ Index (0=DMA0, 1=DMA7, 2=DMA6, 3=DMA5) */
   unchar  sync;        /* 1 if scsi target id 7...0 is running sync scsi */

   /* Structure extension defined in EATA 2.0B */
   unchar  isaena:1,    /* ISA i/o addressing is disabled/enabled */
         forcaddr:1,    /* Port address has been forced */
         large_sg:1,    /* 1 if large SG lists are supported */
             res1:1,
                 :4;
   unchar  max_id:5,    /* Max SCSI target ID number */
         max_chan:3;    /* Max SCSI channel number on this board */

   /* Structure extension defined in EATA 2.0C */
   unchar   max_lun;    /* Max SCSI LUN number */
   unchar        :4,
               m1:1,    /* This is a PCI with an M1 chip installed */
          idquest:1,    /* RAIDNUM returned is questionable */
              pci:1,    /* This board is PCI */
             eisa:1;    /* This board is EISA */
   unchar   raidnum;    /* Uniquely identifies this HBA in a system */
   unchar   notused;

   ushort ipad[247];
   };

/* Board config structure */
struct eata_config {
   ushort len;          /* Number of bytes following this field */
   unchar edis:1,       /* Disable EATA interface after config command */
         ocena:1,       /* Overlapped Commands Enabled */
        mdpena:1,       /* Transfer all Modified Data Pointer Messages */
        tarena:1,       /* Target Mode Enabled for this controller */
              :4;
   unchar cpad[511];
   };

/* Returned status packet structure */
struct mssp {
   unchar adapter_status:7,    /* State related to current command */
                     eoc:1;    /* End Of Command (1 = command completed) */
   unchar target_status;       /* SCSI status received after data transfer */
   unchar unused[2];
   ulong inv_res_len;          /* Number of bytes not transferred */
   struct mscp *cpp;           /* Address set in cp */
   char mess[12];
   };

struct sg_list {
   unsigned int address;                /* Segment Address */
   unsigned int num_bytes;              /* Segment Length */
   };

/* MailBox SCSI Command Packet */
struct mscp {
   unchar  sreset:1,     /* SCSI Bus Reset Signal should be asserted */
             init:1,     /* Re-initialize controller and self test */
           reqsen:1,     /* Transfer Request Sense Data to addr using DMA */
               sg:1,     /* Use Scatter/Gather */
                 :1,
           interp:1,     /* The controller interprets cp, not the target */
             dout:1,     /* Direction of Transfer is Out (Host to Target) */
              din:1;     /* Direction of Transfer is In (Target to Host) */
   unchar sense_len;     /* Request Sense Length */
   unchar unused[3];
   unchar  fwnest:1,     /* Send command to a component of an Array Group */
                 :7;
   unchar phsunit:1,     /* Send to Target Physical Unit (bypass RAID) */
              iat:1,     /* Inhibit Address Translation */
            hbaci:1,     /* Inhibit HBA Caching for this command */
                 :5;
   unchar  target:5,     /* SCSI target ID */
          channel:3;     /* SCSI channel number */
   unchar     lun:5,     /* SCSI logical unit number */
           luntar:1,     /* This cp is for Target (not LUN) */
           dispri:1,     /* Disconnect Privilege granted */
              one:1;     /* 1 */
   unchar mess[3];       /* Massage to/from Target */
   unchar cdb[12];       /* Command Descriptor Block */
   ulong  data_len;      /* If sg=0 Data Length, if sg=1 sglist length */
   struct mscp *cpp;     /* Address to be returned in sp */
   ulong  data_address;  /* If sg=0 Data Address, if sg=1 sglist address */
   ulong  sp_addr;       /* Address where sp is DMA'ed when cp completes */
   ulong  sense_addr;    /* Address where Sense Data is DMA'ed on error */
   Scsi_Cmnd *SCpnt;
   unsigned int index;   /* cp index */
   struct sg_list *sglist;
   };

struct hostdata {
   struct mscp cp[MAX_MAILBOXES];       /* Mailboxes for this board */
   unsigned int cp_stat[MAX_MAILBOXES]; /* FREE, IN_USE, LOCKED, IN_RESET */
   unsigned int last_cp_used;           /* Index of last mailbox used */
   unsigned int iocount;                /* Total i/o done for this board */
   int board_number;                    /* Number of this board */
   char board_name[16];                 /* Name of this board */
   char board_id[256];                  /* data from INQUIRY on this board */
   int in_reset;                        /* True if board is doing a reset */
   int target_to[MAX_TARGET][MAX_CHANNEL]; /* N. of timeout errors on target */
   int target_redo[MAX_TARGET][MAX_CHANNEL]; /* If TRUE redo i/o on target */
   unsigned int retries;                /* Number of internal retries */
   unsigned long last_retried_pid;      /* Pid of last retried command */
   unsigned char subversion;            /* Bus type, either ISA or EISA/PCI */
   unsigned char protocol_rev;          /* EATA 2.0 rev., 'A' or 'B' or 'C' */
   struct mssp sp[2];                   /* Returned status for this board */
   };

static struct Scsi_Host *sh[MAX_BOARDS + 1];
static const char *driver_name = "EATA";
static char sha[MAX_BOARDS];

/* Initialize num_boards so that ihdlr can work while detect is in progress */
static unsigned int num_boards = MAX_BOARDS;

static unsigned long io_port[] __initdata = {

   /* Space for MAX_INT_PARAM ports usable while loading as a module */
   SKIP,    SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,
   SKIP,    SKIP,

   /* First ISA */
   0x1f0,

   /* Space for MAX_PCI ports possibly reported by PCI_BIOS */
   SKIP,    SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,
   SKIP,    SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,

   /* MAX_EISA ports */
   0x1c88, 0x2c88, 0x3c88, 0x4c88, 0x5c88, 0x6c88, 0x7c88, 0x8c88,
   0x9c88, 0xac88, 0xbc88, 0xcc88, 0xdc88, 0xec88, 0xfc88,

   /* Other (MAX_ISA - 1) ports */
   0x170,  0x230,  0x330,

   /* End of list */
   0x0
   };

#define HD(board) ((struct hostdata *) &sh[board]->hostdata)
#define BN(board) (HD(board)->board_name)

#define H2DEV(x) htonl(x)
#define DEV2H(x) H2DEV(x)
#define V2DEV(addr) ((addr) ? H2DEV(virt_to_bus((void *)addr)) : 0)
#define DEV2V(addr) ((addr) ? DEV2H(bus_to_virt((unsigned long)addr)) : 0)

static void do_interrupt_handler(int, void *, struct pt_regs *);
static void flush_dev(Scsi_Device *, unsigned long, unsigned int, unsigned int);
static int do_trace = FALSE;
static int setup_done = FALSE;
static int link_statistics = 0;
static int tag_mode = TAG_MIXED;

#if defined (CONFIG_SCSI_EATA_TAGGED_QUEUE)
static int tagged_comm = TRUE;
#else
static int tagged_comm = FALSE;
#endif

#if defined (CONFIG_SCSI_EATA_LINKED_COMMANDS)
static int linked_comm = TRUE;
#else
static int linked_comm = FALSE;
#endif

#if defined CONFIG_SCSI_EATA_MAX_TAGS
static int max_queue_depth = CONFIG_SCSI_EATA_MAX_TAGS;
#else
static int max_queue_depth = MAX_CMD_PER_LUN;
#endif

static void select_queue_depths(struct Scsi_Host *host, Scsi_Device *devlist) {
   Scsi_Device *dev;
   int j, ntag = 0, nuntag = 0, tqd, utqd;
   unsigned long flags;

   save_flags(flags);
   cli();

   j = ((struct hostdata *) host->hostdata)->board_number;

   for(dev = devlist; dev; dev = dev->next) {

      if (dev->host != host) continue;

      if (TLDEV(dev->type) && (dev->tagged_supported || linked_comm))
         ntag++;
      else
         nuntag++;
      }

   utqd = MAX_CMD_PER_LUN;

   tqd = (host->can_queue - utqd * nuntag) / (ntag ? ntag : 1);

   if (tqd > max_queue_depth) tqd = max_queue_depth;

   if (tqd < MAX_CMD_PER_LUN) tqd = MAX_CMD_PER_LUN;

   for(dev = devlist; dev; dev = dev->next) {
      char *tag_suffix = "", *link_suffix = "";

      if (dev->host != host) continue;

      if (TLDEV(dev->type) && (dev->tagged_supported || linked_comm))
         dev->queue_depth = tqd;
      else
         dev->queue_depth = utqd;

      if (TLDEV(dev->type)) {
         if (linked_comm && dev->queue_depth > 2)
            link_suffix = ", sorted";
         else
            link_suffix = ", unsorted";
         }

      if (tagged_comm && dev->tagged_supported && TLDEV(dev->type)) {
         dev->tagged_queue = 1;
         dev->current_tag = 1;
         }

      if (dev->tagged_supported && TLDEV(dev->type) && dev->tagged_queue)
         tag_suffix = ", tagged";
      else if (dev->tagged_supported && TLDEV(dev->type))
         tag_suffix = ", untagged";

      printk("%s: scsi%d, channel %d, id %d, lun %d, cmds/lun %d%s%s.\n",
             BN(j), host->host_no, dev->channel, dev->id, dev->lun,
             dev->queue_depth, link_suffix, tag_suffix);
      }

   restore_flags(flags);
   return;
}

static inline int wait_on_busy(unsigned long iobase, unsigned int loop) {

   while (inb(iobase + REG_AUX_STATUS) & ABSY_ASSERTED) {
      udelay(1L);
      if (--loop == 0) return TRUE;
      }

   return FALSE;
}

static inline int do_dma(unsigned long iobase, unsigned int addr, unchar cmd) {

   if (wait_on_busy(iobase, (addr ? MAXLOOP * 100 : MAXLOOP))) return TRUE;

   if ((addr = V2DEV(addr))) {
      outb((char) (addr >> 24), iobase + REG_LOW);
      outb((char) (addr >> 16), iobase + REG_LM);
      outb((char) (addr >> 8),  iobase + REG_MID);
      outb((char)  addr,        iobase + REG_MSB);
      }

   outb(cmd, iobase + REG_CMD);
   return FALSE;
}

static inline int read_pio(unsigned long iobase, ushort *start, ushort *end) {
   unsigned int loop = MAXLOOP;
   ushort *p;

   for (p = start; p <= end; p++) {

      while (!(inb(iobase + REG_STATUS) & DRQ_ASSERTED)) {
         udelay(1L);
         if (--loop == 0) return TRUE;
         }

      loop = MAXLOOP;
      *p = inw(iobase);
      }

   return FALSE;
}

__initfunc (static inline int
            get_pci_irq(unsigned long port_base, unsigned char *apic_irq)) {

#if defined(CONFIG_PCI)

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,93)

   unsigned int addr;
   struct pci_dev *dev = NULL;

   if (!pci_present()) return FALSE;

   while((dev = pci_find_class(PCI_CLASS_STORAGE_SCSI << 8, dev))) {

      if (pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &addr)) continue;

#if defined(DEBUG_PCI_DETECT)
      printk("%s: get_pci_irq, bus %d, devfn 0x%x, addr 0x%x, apic_irq %u.\n",
             driver_name, dev->bus->number, dev->devfn, addr, dev->irq);
#endif

      if ((addr & PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_IO)
             continue;

      if ((addr & PCI_BASE_ADDRESS_IO_MASK) + PCI_BASE_ADDRESS_0 == port_base) {
         *apic_irq = dev->irq;
         return TRUE;
         }

      }

#endif /* end new style PCI code */

#endif /* end CONFIG_PCI */

   return FALSE;
}

__initfunc (static inline int port_detect \
      (unsigned long port_base, unsigned int j, Scsi_Host_Template *tpnt)) {
   unsigned char irq, dma_channel, subversion, i;
   unsigned char protocol_rev, apic_irq;
   struct eata_info info;
   char *bus_type, dma_name[16], tag_type;

   /* Allowed DMA channels for ISA (0 indicates reserved) */
   unsigned char dma_channel_table[4] = { 5, 6, 7, 0 };

   char name[16];

   sprintf(name, "%s%d", driver_name, j);

   if(check_region(port_base, REGION_SIZE)) {
      printk("%s: address 0x%03lx in use, skipping probe.\n", name, port_base);
      return FALSE;
      }

   if (do_dma(port_base, 0, READ_CONFIG_PIO)) return FALSE;

   /* Read the info structure */
   if (read_pio(port_base, (ushort *)&info, (ushort *)&info.ipad[0]))
      return FALSE;

   /* Check the controller "EATA" signature */
   if (info.sign != EATA_SIGNATURE) return FALSE;

   if (DEV2H(info.data_len) < EATA_2_0A_SIZE) {
      printk("%s: config structure size (%ld bytes) too short, detaching.\n",
             name, DEV2H(info.data_len));
      return FALSE;
      }
   else if (DEV2H(info.data_len) == EATA_2_0A_SIZE)
      protocol_rev = 'A';
   else if (DEV2H(info.data_len) == EATA_2_0B_SIZE)
      protocol_rev = 'B';
   else
      protocol_rev = 'C';

   if (!setup_done && j > 0 && j <= MAX_PCI) {
      bus_type = "PCI";
      subversion = ESA;
      }
   else if (port_base > MAX_EISA_ADDR || (protocol_rev == 'C' && info.pci)) {
      bus_type = "PCI";
      subversion = ESA;
      }
   else if (port_base >= MIN_EISA_ADDR || (protocol_rev == 'C' && info.eisa)) {
      bus_type = "EISA";
      subversion = ESA;
      }
   else if (protocol_rev == 'C' && !info.eisa && !info.pci) {
      bus_type = "ISA";
      subversion = ISA;
      }
   else if (port_base > MAX_ISA_ADDR) {
      bus_type = "PCI";
      subversion = ESA;
      }
   else {
      bus_type = "ISA";
      subversion = ISA;
      }

   if (!info.haaval || info.ata) {
      printk("%s: address 0x%03lx, unusable %s board (%d%d), detaching.\n",
             name, port_base, bus_type, info.haaval, info.ata);
      return FALSE;
      }

   if (info.drqvld) {

      if (subversion ==  ESA)
         printk("%s: warning, weird %s board using DMA.\n", name, bus_type);

      subversion = ISA;
      dma_channel = dma_channel_table[3 - info.drqx];
      }
   else {

      if (subversion ==  ISA)
         printk("%s: warning, weird %s board not using DMA.\n", name, bus_type);

      subversion = ESA;
      dma_channel = NO_DMA;
      }

   if (!info.dmasup)
      printk("%s: warning, DMA protocol support not asserted.\n", name);

   irq = info.irq;

   if (subversion == ESA && !info.irq_tr)
      printk("%s: warning, LEVEL triggering is suggested for IRQ %u.\n",
             name, irq);

   if (get_pci_irq(port_base, &apic_irq) && (irq != apic_irq)) {
      printk("%s: IRQ %u mapped to IO-APIC IRQ %u.\n", name, irq, apic_irq);
      irq = apic_irq;
      }

   /* Board detected, allocate its IRQ */
   if (request_irq(irq, do_interrupt_handler,
             SA_INTERRUPT | ((subversion == ESA) ? SA_SHIRQ : 0),
             driver_name, (void *) &sha[j])) {
      printk("%s: unable to allocate IRQ %u, detaching.\n", name, irq);
      return FALSE;
      }

   if (subversion == ISA && request_dma(dma_channel, driver_name)) {
      printk("%s: unable to allocate DMA channel %u, detaching.\n",
             name, dma_channel);
      free_irq(irq, &sha[j]);
      return FALSE;
      }

#if defined (FORCE_CONFIG)
   {
   struct eata_config config;

   /* Set board configuration */
   memset((char *)&config, 0, sizeof(struct eata_config));
   config.len = (ushort) htons((ushort)510);
   config.ocena = TRUE;

   if (do_dma(port_base, (unsigned int)&config, SET_CONFIG_DMA)) {
      printk("%s: busy timeout sending configuration, detaching.\n", name);
      return FALSE;
      }
   }
#endif

   sh[j] = scsi_register(tpnt, sizeof(struct hostdata));

   if (sh[j] == NULL) {
      printk("%s: unable to register host, detaching.\n", name);

      free_irq(irq, &sha[j]);

      if (subversion == ISA) free_dma(dma_channel);

      return FALSE;
      }

   sh[j]->io_port = port_base;
   sh[j]->unique_id = port_base;
   sh[j]->n_io_port = REGION_SIZE;
   sh[j]->dma_channel = dma_channel;
   sh[j]->irq = irq;
   sh[j]->sg_tablesize = (ushort) ntohs(info.scatt_size);
   sh[j]->this_id = (ushort) info.host_addr[3];
   sh[j]->can_queue = (ushort) ntohs(info.queue_size);
   sh[j]->cmd_per_lun = MAX_CMD_PER_LUN;
   sh[j]->select_queue_depths = select_queue_depths;

   /* Register the I/O space that we use */
   request_region(sh[j]->io_port, sh[j]->n_io_port, driver_name);

   memset(HD(j), 0, sizeof(struct hostdata));
   HD(j)->subversion = subversion;
   HD(j)->protocol_rev = protocol_rev;
   HD(j)->board_number = j;

   if (HD(j)->subversion == ESA)
      sh[j]->unchecked_isa_dma = FALSE;
   else {
      sh[j]->wish_block = TRUE;
      sh[j]->unchecked_isa_dma = TRUE;
      disable_dma(dma_channel);
      clear_dma_ff(dma_channel);
      set_dma_mode(dma_channel, DMA_MODE_CASCADE);
      enable_dma(dma_channel);
      }

   strcpy(BN(j), name);

   /* DPT PM2012 does not allow to detect sg_tablesize correctly */
   if (sh[j]->sg_tablesize > MAX_SGLIST || sh[j]->sg_tablesize < 2) {
      printk("%s: detect, wrong n. of SG lists %d, fixed.\n",
             BN(j), sh[j]->sg_tablesize);
      sh[j]->sg_tablesize = MAX_SGLIST;
      }

   /* DPT PM2012 does not allow to detect can_queue correctly */
   if (sh[j]->can_queue > MAX_MAILBOXES || sh[j]->can_queue  < 2) {
      printk("%s: detect, wrong n. of mbox %d, fixed.\n",
             BN(j), sh[j]->can_queue);
      sh[j]->can_queue = MAX_MAILBOXES;
      }

   if (protocol_rev != 'A') {

      if (info.max_chan > 0 && info.max_chan < MAX_CHANNEL)
         sh[j]->max_channel = info.max_chan;

      if (info.max_id > 7 && info.max_id < MAX_TARGET)
         sh[j]->max_id = info.max_id + 1;

      if (info.large_sg && sh[j]->sg_tablesize == MAX_SGLIST)
         sh[j]->sg_tablesize = MAX_LARGE_SGLIST;
      }

   if (protocol_rev == 'C') {

      if (info.max_lun > 7 && info.max_lun < MAX_LUN)
         sh[j]->max_lun = info.max_lun + 1;
      }

   if (dma_channel == NO_DMA) sprintf(dma_name, "%s", "BMST");
   else                       sprintf(dma_name, "DMA %u", dma_channel);

   for (i = 0; i < sh[j]->can_queue; i++)
      if (! ((&HD(j)->cp[i])->sglist = kmalloc(
            sh[j]->sg_tablesize * sizeof(struct sg_list),
            (sh[j]->unchecked_isa_dma ? GFP_DMA : 0) | GFP_ATOMIC))) {
         printk("%s: kmalloc SGlist failed, mbox %d, detaching.\n", BN(j), i);
         eata2x_release(sh[j]);
         return FALSE;
         }

   if (max_queue_depth > MAX_TAGGED_CMD_PER_LUN)
       max_queue_depth = MAX_TAGGED_CMD_PER_LUN;

   if (max_queue_depth < MAX_CMD_PER_LUN) max_queue_depth = MAX_CMD_PER_LUN;

   if (tagged_comm) {
      if      (tag_mode == TAG_SIMPLE)  tag_type = '1';
      else if (tag_mode == TAG_HEAD)    tag_type = '2';
      else if (tag_mode == TAG_ORDERED) tag_type = '3';
      else                              tag_type = 'y';
      }
   else                                 tag_type = 'n';

   printk("%s: 2.0%c, %s 0x%03lx, IRQ %u, %s, SG %d, MB %d, tc:%c, lc:%c, "\
          "mq:%d.\n", BN(j), HD(j)->protocol_rev, bus_type,
          (unsigned long)sh[j]->io_port, sh[j]->irq, dma_name,
          sh[j]->sg_tablesize, sh[j]->can_queue, tag_type, YESNO(linked_comm),
          max_queue_depth);

   if (sh[j]->max_id > 8 || sh[j]->max_lun > 8)
      printk("%s: wide SCSI support enabled, max_id %u, max_lun %u.\n",
             BN(j), sh[j]->max_id, sh[j]->max_lun);

   for (i = 0; i <= sh[j]->max_channel; i++)
      printk("%s: SCSI channel %u enabled, host target ID %u.\n",
             BN(j), i, info.host_addr[3 - i]);

#if defined (DEBUG_DETECT)
   printk("%s: Vers. 0x%x, ocs %u, tar %u, trnxfr %u, more %u, SYNC 0x%x, "\
          "sec. %u, infol %ld, cpl %ld spl %ld.\n", name, info.version,
          info.ocsena, info.tarsup, info.trnxfr, info.morsup, info.sync,
          info.second, DEV2H(info.data_len), DEV2H(info.cp_len),
          DEV2H(info.sp_len));

   if (protocol_rev == 'B' || protocol_rev == 'C')
      printk("%s: isaena %u, forcaddr %u, max_id %u, max_chan %u, "\
             "large_sg %u, res1 %u.\n", name, info.isaena, info.forcaddr,
             info.max_id, info.max_chan, info.large_sg, info.res1);

   if (protocol_rev == 'C')
      printk("%s: max_lun %u, m1 %u, idquest %u, pci %u, eisa %u, "\
             "raidnum %u.\n", name, info.max_lun, info.m1, info.idquest,
             info.pci, info.eisa, info.raidnum);
#endif

   return TRUE;
}

__initfunc (void eata2x_setup(char *str, int *ints)) {
   int i, argc = ints[0];
   char *cur = str, *pc;

   if (argc > 0) {

      if (argc > MAX_INT_PARAM) argc = MAX_INT_PARAM;

      for (i = 0; i < argc; i++) io_port[i] = ints[i + 1];

      io_port[i] = 0;
      setup_done = TRUE;
      }

   while (cur && (pc = strchr(cur, ':'))) {
      int val = 0, c = *++pc;

      if (c == 'n' || c == 'N') val = FALSE;
      else if (c == 'y' || c == 'Y') val = TRUE;
      else val = (int) simple_strtoul(pc, NULL, 0);

      if (!strncmp(cur, "lc:", 3)) linked_comm = val;
      else if (!strncmp(cur, "tc:", 3)) tagged_comm = val;
      else if (!strncmp(cur, "tm:", 3)) tag_mode = val;
      else if (!strncmp(cur, "mq:", 3))  max_queue_depth = val;
      else if (!strncmp(cur, "ls:", 3))  link_statistics = val;

      if ((cur = strchr(cur, ','))) ++cur;
      }

   return;
}

__initfunc (static void add_pci_ports(void)) {

#if defined(CONFIG_PCI)

   unsigned int addr, k;

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,93)

   struct pci_dev *dev = NULL;

   if (!pci_present()) return;

   for (k = 0; k < MAX_PCI; k++) {

      if (!(dev = pci_find_class(PCI_CLASS_STORAGE_SCSI << 8, dev))) break;

      if (pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &addr)) continue;

#if defined(DEBUG_PCI_DETECT)
      printk("%s: detect, seq. %d, bus %d, devfn 0x%x, addr 0x%x.\n",
             driver_name, k, dev->bus->number, dev->devfn, addr);
#endif

      if ((addr & PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_IO)
             continue;

      /* Reverse the returned address order */
      io_port[MAX_INT_PARAM + MAX_PCI - k] =
             (addr & PCI_BASE_ADDRESS_IO_MASK) + PCI_BASE_ADDRESS_0;
      }

#else  /* else old style PCI code */

   unsigned short i = 0;
   unsigned char bus, devfn;

   if (!pcibios_present()) return;

   for (k = 0; k < MAX_PCI; k++) {

      if (pcibios_find_class(PCI_CLASS_STORAGE_SCSI << 8, i++, &bus, &devfn)
             != PCIBIOS_SUCCESSFUL) break;

      if (pcibios_read_config_dword(bus, devfn, PCI_BASE_ADDRESS_0, &addr)
             != PCIBIOS_SUCCESSFUL) continue;

#if defined(DEBUG_PCI_DETECT)
      printk("%s: detect, seq. %d, bus %d, devfn 0x%x, addr 0x%x.\n",
             driver_name, k, bus, devfn, addr);
#endif

      if ((addr & PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_IO)
             continue;

      /* Reverse the returned address order */
      io_port[MAX_INT_PARAM + MAX_PCI - k] =
             (addr & PCI_BASE_ADDRESS_IO_MASK) + PCI_BASE_ADDRESS_0;
      }

#endif /* end old style PCI code */

#endif /* end CONFIG_PCI */

   return;
}

__initfunc (int eata2x_detect(Scsi_Host_Template *tpnt)) {
   unsigned long flags;
   unsigned int j = 0, k;

   tpnt->proc_dir = &proc_scsi_eata2x;

   save_flags(flags);
   cli();

#if defined(MODULE)
   /* io_port could have been modified when loading as a module */
   if(io_port[0] != SKIP) {
      setup_done = TRUE;
      io_port[MAX_INT_PARAM] = 0;
      }
#endif

   for (k = 0; k < MAX_BOARDS + 1; k++) sh[k] = NULL;

   if (!setup_done) add_pci_ports();

   for (k = 0; io_port[k]; k++) {

      if (io_port[k] == SKIP) continue;

      if (j < MAX_BOARDS && port_detect(io_port[k], j, tpnt)) j++;
      }

   if (j > 0)
      printk("EATA/DMA 2.0x: Copyright (C) 1994-1998 Dario Ballabio.\n");

   num_boards = j;
   restore_flags(flags);
   return j;
}

static inline void build_sg_list(struct mscp *cpp, Scsi_Cmnd *SCpnt) {
   unsigned int k;
   struct scatterlist *sgpnt;

   sgpnt = (struct scatterlist *) SCpnt->request_buffer;

   for (k = 0; k < SCpnt->use_sg; k++) {
      cpp->sglist[k].address = V2DEV(sgpnt[k].address);
      cpp->sglist[k].num_bytes = H2DEV(sgpnt[k].length);
      }

   cpp->data_address = V2DEV(cpp->sglist);
   cpp->data_len = H2DEV((SCpnt->use_sg * sizeof(struct sg_list)));
}

int eata2x_queuecommand(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *)) {
   unsigned long flags;
   unsigned int i, j, k;
   struct mscp *cpp;
   struct mssp *spp;

   static const unsigned char data_out_cmds[] = {
      0x0a, 0x2a, 0x15, 0x55, 0x04, 0x07, 0x18, 0x1d, 0x24, 0x2e,
      0x30, 0x31, 0x32, 0x38, 0x39, 0x3a, 0x3b, 0x3d, 0x3f, 0x40,
      0x41, 0x4c, 0xaa, 0xae, 0xb0, 0xb1, 0xb2, 0xb6, 0xea, 0x1b
      };

   static const unsigned char data_none_cmds[] = {
      0x01, 0x0b, 0x10, 0x11, 0x13, 0x16, 0x17, 0x19, 0x2b, 0x1e,
      0x2c, 0xac, 0x2f, 0xaf, 0x33, 0xb3, 0x35, 0x36, 0x45, 0x47,
      0x48, 0x49, 0xa9, 0x4b, 0xa5, 0xa6, 0xb5
      };

   save_flags(flags);
   cli();
   /* j is the board number */
   j = ((struct hostdata *) SCpnt->host->hostdata)->board_number;

   if (!done) panic("%s: qcomm, pid %ld, null done.\n", BN(j), SCpnt->pid);

   if (SCpnt->cmnd[0] == REQUEST_SENSE && SCpnt->sense_buffer[0]) {
      SCpnt->result = DID_OK << 16;
      SCpnt->host_scribble = NULL;
      printk("%s: qcomm, target %d.%d:%d, pid %ld, request sense ignored.\n",
             BN(j), SCpnt->channel, SCpnt->target, SCpnt->lun, SCpnt->pid);
      restore_flags(flags);
      done(SCpnt);
      return 0;
      }

   /* i is the mailbox number, look for the first free mailbox
      starting from last_cp_used */
   i = HD(j)->last_cp_used + 1;

   for (k = 0; k < sh[j]->can_queue; k++, i++) {

      if (i >= sh[j]->can_queue) i = 0;

      if (HD(j)->cp_stat[i] == FREE) {
         HD(j)->last_cp_used = i;
         break;
         }
      }

   if (k == sh[j]->can_queue) {
      printk("%s: qcomm, no free mailbox, resetting.\n", BN(j));

      if (HD(j)->in_reset)
         printk("%s: qcomm, already in reset.\n", BN(j));
      else if (eata2x_reset(SCpnt, SCSI_RESET_SUGGEST_BUS_RESET)
               == SCSI_RESET_SUCCESS)
         panic("%s: qcomm, SCSI_RESET_SUCCESS.\n", BN(j));

      SCpnt->result = DID_BUS_BUSY << 16;
      SCpnt->host_scribble = NULL;
      printk("%s: qcomm, pid %ld, DID_BUS_BUSY, done.\n", BN(j), SCpnt->pid);
      restore_flags(flags);
      done(SCpnt);
      return 1;
      }

   /* Set pointer to control packet structure */
   cpp = &HD(j)->cp[i];

   memset(cpp, 0, sizeof(struct mscp) - sizeof(struct sg_list *));

   /* Set pointer to status packet structure */
   spp = &HD(j)->sp[0];

   /* The EATA protocol uses Big Endian format */
   cpp->sp_addr = V2DEV(spp);

   cpp->cpp = cpp;
   SCpnt->scsi_done = done;
   cpp->index = i;
   SCpnt->host_scribble = (unsigned char *) &cpp->index;

   if (do_trace) printk("%s: qcomm, mbox %d, target %d.%d:%d, pid %ld.\n",
                        BN(j), i, SCpnt->channel, SCpnt->target,
                        SCpnt->lun, SCpnt->pid);

   for (k = 0; k < ARRAY_SIZE(data_out_cmds); k++)
     if (SCpnt->cmnd[0] == data_out_cmds[k]) {
        cpp->dout = TRUE;
        break;
        }

   if ((cpp->din = !cpp->dout))
      for (k = 0; k < ARRAY_SIZE(data_none_cmds); k++)
        if (SCpnt->cmnd[0] == data_none_cmds[k]) {
           cpp->din = FALSE;
           break;
           }

   cpp->reqsen = TRUE;
   cpp->dispri = TRUE;
#if 0
   if (SCpnt->device->type == TYPE_TAPE) cpp->hbaci = TRUE;
#endif
   cpp->one = TRUE;
   cpp->channel = SCpnt->channel;
   cpp->target = SCpnt->target;
   cpp->lun = SCpnt->lun;
   cpp->SCpnt = SCpnt;
   cpp->sense_addr = V2DEV(SCpnt->sense_buffer);
   cpp->sense_len = sizeof SCpnt->sense_buffer;

   if (SCpnt->device->tagged_queue) {

      if (HD(j)->target_redo[SCpnt->target][SCpnt->channel] ||
            HD(j)->target_to[SCpnt->target][SCpnt->channel])
         cpp->mess[0] = ORDERED_QUEUE_TAG;
      else if (tag_mode == TAG_SIMPLE)  cpp->mess[0] = SIMPLE_QUEUE_TAG;
      else if (tag_mode == TAG_HEAD)    cpp->mess[0] = HEAD_OF_QUEUE_TAG;
      else if (tag_mode == TAG_ORDERED) cpp->mess[0] = ORDERED_QUEUE_TAG;
      else if (SCpnt->device->current_tag == 0)
         cpp->mess[0] = ORDERED_QUEUE_TAG;
      else if (SCpnt->device->current_tag == 1)
         cpp->mess[0] = HEAD_OF_QUEUE_TAG;
      else
         cpp->mess[0] = SIMPLE_QUEUE_TAG;

      cpp->mess[1] = SCpnt->device->current_tag++;
      }

   if (SCpnt->use_sg) {
      cpp->sg = TRUE;
      build_sg_list(cpp, SCpnt);
      }
   else {
      cpp->data_address = V2DEV(SCpnt->request_buffer);
      cpp->data_len = H2DEV(SCpnt->request_bufflen);
      }

   memcpy(cpp->cdb, SCpnt->cmnd, SCpnt->cmd_len);

   if (linked_comm && SCpnt->device->queue_depth > 2
                                     && TLDEV(SCpnt->device->type)) {
      HD(j)->cp_stat[i] = READY;
      flush_dev(SCpnt->device, SCpnt->request.sector, j, FALSE);
      restore_flags(flags);
      return 0;
      }

   /* Send control packet to the board */
   if (do_dma(sh[j]->io_port, (unsigned int) cpp, SEND_CP_DMA)) {
      SCpnt->result = DID_ERROR << 16;
      SCpnt->host_scribble = NULL;
      printk("%s: qcomm, target %d.%d:%d, pid %ld, adapter busy, DID_ERROR,"\
             " done.\n", BN(j), SCpnt->channel, SCpnt->target, SCpnt->lun,
             SCpnt->pid);
      restore_flags(flags);
      done(SCpnt);
      return 1;
      }

   HD(j)->cp_stat[i] = IN_USE;
   restore_flags(flags);
   return 0;
}

int eata2x_abort(Scsi_Cmnd *SCarg) {
   unsigned long flags;
   unsigned int i, j;

   save_flags(flags);
   cli();
   j = ((struct hostdata *) SCarg->host->hostdata)->board_number;

   if (SCarg->host_scribble == NULL
       || SCarg->serial_number != SCarg->serial_number_at_timeout) {
      printk("%s: abort, target %d.%d:%d, pid %ld inactive.\n",
             BN(j), SCarg->channel, SCarg->target, SCarg->lun, SCarg->pid);
      restore_flags(flags);
      return SCSI_ABORT_NOT_RUNNING;
      }

   i = *(unsigned int *)SCarg->host_scribble;
   printk("%s: abort, mbox %d, target %d.%d:%d, pid %ld.\n",
          BN(j), i, SCarg->channel, SCarg->target, SCarg->lun, SCarg->pid);

   if (i >= sh[j]->can_queue)
      panic("%s: abort, invalid SCarg->host_scribble.\n", BN(j));

   if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
      printk("%s: abort, timeout error.\n", BN(j));
      restore_flags(flags);
      return SCSI_ABORT_ERROR;
      }

   if (HD(j)->cp_stat[i] == FREE) {
      printk("%s: abort, mbox %d is free.\n", BN(j), i);
      restore_flags(flags);
      return SCSI_ABORT_NOT_RUNNING;
      }

   if (HD(j)->cp_stat[i] == IN_USE) {
      printk("%s: abort, mbox %d is in use.\n", BN(j), i);

      if (SCarg != HD(j)->cp[i].SCpnt)
         panic("%s: abort, mbox %d, SCarg %p, cp SCpnt %p.\n",
               BN(j), i, SCarg, HD(j)->cp[i].SCpnt);

      if (inb(sh[j]->io_port + REG_AUX_STATUS) & IRQ_ASSERTED)
         printk("%s: abort, mbox %d, interrupt pending.\n", BN(j), i);

      restore_flags(flags);
      return SCSI_ABORT_SNOOZE;
      }

   if (HD(j)->cp_stat[i] == IN_RESET) {
      printk("%s: abort, mbox %d is in reset.\n", BN(j), i);
      restore_flags(flags);
      return SCSI_ABORT_ERROR;
      }

   if (HD(j)->cp_stat[i] == LOCKED) {
      printk("%s: abort, mbox %d is locked.\n", BN(j), i);
      restore_flags(flags);
      return SCSI_ABORT_NOT_RUNNING;
      }

   if (HD(j)->cp_stat[i] == READY || HD(j)->cp_stat[i] == ABORTING) {
      SCarg->result = DID_ABORT << 16;
      SCarg->host_scribble = NULL;
      HD(j)->cp_stat[i] = FREE;
      printk("%s, abort, mbox %d ready, DID_ABORT, pid %ld done.\n",
             BN(j), i, SCarg->pid);
      SCarg->scsi_done(SCarg);
      restore_flags(flags);
      return SCSI_ABORT_SUCCESS;
      }

   restore_flags(flags);
   panic("%s: abort, mbox %d, invalid cp_stat.\n", BN(j), i);
}

int eata2x_reset(Scsi_Cmnd *SCarg, unsigned int reset_flags) {
   unsigned long flags;
   unsigned int i, j, time, k, c, limit = 0;
   int arg_done = FALSE;
   Scsi_Cmnd *SCpnt;

   save_flags(flags);
   cli();
   j = ((struct hostdata *) SCarg->host->hostdata)->board_number;
   printk("%s: reset, enter, target %d.%d:%d, pid %ld, reset_flags %u.\n",
          BN(j), SCarg->channel, SCarg->target, SCarg->lun, SCarg->pid,
          reset_flags);

   if (SCarg->host_scribble == NULL)
      printk("%s: reset, pid %ld inactive.\n", BN(j), SCarg->pid);

   if (SCarg->serial_number != SCarg->serial_number_at_timeout) {
      printk("%s: reset, pid %ld, reset not running.\n", BN(j), SCarg->pid);
      restore_flags(flags);
      return SCSI_RESET_NOT_RUNNING;
      }

   if (HD(j)->in_reset) {
      printk("%s: reset, exit, already in reset.\n", BN(j));
      restore_flags(flags);
      return SCSI_RESET_ERROR;
      }

   if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
      printk("%s: reset, exit, timeout error.\n", BN(j));
      restore_flags(flags);
      return SCSI_RESET_ERROR;
      }

   HD(j)->retries = 0;

   for (c = 0; c <= sh[j]->max_channel; c++)
      for (k = 0; k < sh[j]->max_id; k++) {
         HD(j)->target_redo[k][c] = TRUE;
         HD(j)->target_to[k][c] = 0;
         }

   for (i = 0; i < sh[j]->can_queue; i++) {

      if (HD(j)->cp_stat[i] == FREE) continue;

      if (HD(j)->cp_stat[i] == LOCKED) {
         HD(j)->cp_stat[i] = FREE;
         printk("%s: reset, locked mbox %d forced free.\n", BN(j), i);
         continue;
         }

      if (!(SCpnt = HD(j)->cp[i].SCpnt))
         panic("%s: reset, mbox %d, SCpnt == NULL.\n", BN(j), i);

      if (HD(j)->cp_stat[i] == READY || HD(j)->cp_stat[i] == ABORTING) {
         HD(j)->cp_stat[i] = ABORTING;
         printk("%s: reset, mbox %d aborting, pid %ld.\n",
                BN(j), i, SCpnt->pid);
         }

      else {
         HD(j)->cp_stat[i] = IN_RESET;
         printk("%s: reset, mbox %d in reset, pid %ld.\n",
                BN(j), i, SCpnt->pid);
         }

      if (SCpnt->host_scribble == NULL)
         panic("%s: reset, mbox %d, garbled SCpnt.\n", BN(j), i);

      if (*(unsigned int *)SCpnt->host_scribble != i)
         panic("%s: reset, mbox %d, index mismatch.\n", BN(j), i);

      if (SCpnt->scsi_done == NULL)
         panic("%s: reset, mbox %d, SCpnt->scsi_done == NULL.\n", BN(j), i);

      if (SCpnt == SCarg) arg_done = TRUE;
      }

   if (do_dma(sh[j]->io_port, 0, RESET_PIO)) {
      printk("%s: reset, cannot reset, timeout error.\n", BN(j));
      restore_flags(flags);
      return SCSI_RESET_ERROR;
      }

   printk("%s: reset, board reset done, enabling interrupts.\n", BN(j));

#if defined (DEBUG_RESET)
   do_trace = TRUE;
#endif

   HD(j)->in_reset = TRUE;
   sti();
   time = jiffies;
   while ((jiffies - time) < (10 * HZ) && limit++ < 200000) udelay(100L);
   cli();
   printk("%s: reset, interrupts disabled, loops %d.\n", BN(j), limit);

   for (i = 0; i < sh[j]->can_queue; i++) {

      if (HD(j)->cp_stat[i] == IN_RESET) {
         SCpnt = HD(j)->cp[i].SCpnt;
         SCpnt->result = DID_RESET << 16;
         SCpnt->host_scribble = NULL;

         /* This mailbox is still waiting for its interrupt */
         HD(j)->cp_stat[i] = LOCKED;

         printk("%s, reset, mbox %d locked, DID_RESET, pid %ld done.\n",
                BN(j), i, SCpnt->pid);
         }

      else if (HD(j)->cp_stat[i] == ABORTING) {
         SCpnt = HD(j)->cp[i].SCpnt;
         SCpnt->result = DID_RESET << 16;
         SCpnt->host_scribble = NULL;

         /* This mailbox was never queued to the adapter */
         HD(j)->cp_stat[i] = FREE;

         printk("%s, reset, mbox %d aborting, DID_RESET, pid %ld done.\n",
                BN(j), i, SCpnt->pid);
         }

      else

         /* Any other mailbox has already been set free by interrupt */
         continue;

      restore_flags(flags);
      SCpnt->scsi_done(SCpnt);
      cli();
      }

   HD(j)->in_reset = FALSE;
   do_trace = FALSE;
   restore_flags(flags);

   if (arg_done) {
      printk("%s: reset, exit, success.\n", BN(j));
      return SCSI_RESET_SUCCESS;
      }
   else {
      printk("%s: reset, exit, wakeup.\n", BN(j));
      return SCSI_RESET_PUNT;
      }
}

static void sort(unsigned long sk[], unsigned int da[], unsigned int n,
                 unsigned int rev) {
   unsigned int i, j, k, y;
   unsigned long x;

   for (i = 0; i < n - 1; i++) {
      k = i;

      for (j = k + 1; j < n; j++)
         if (rev) {
            if (sk[j] > sk[k]) k = j;
            }
         else {
            if (sk[j] < sk[k]) k = j;
            }

      if (k != i) {
         x = sk[k]; sk[k] = sk[i]; sk[i] = x;
         y = da[k]; da[k] = da[i]; da[i] = y;
         }
      }

   return;
   }

static inline int reorder(unsigned int j, unsigned long cursec,
                 unsigned int ihdlr, unsigned int il[], unsigned int n_ready) {
   Scsi_Cmnd *SCpnt;
   struct mscp *cpp;
   unsigned int k, n;
   unsigned int rev = FALSE, s = TRUE, r = TRUE;
   unsigned int input_only = TRUE, overlap = FALSE;
   unsigned long sl[n_ready], pl[n_ready], ll[n_ready];
   unsigned long maxsec = 0, minsec = ULONG_MAX, seek = 0, iseek = 0;
   unsigned long ioseek = 0;

   static unsigned int flushcount = 0, batchcount = 0, sortcount = 0;
   static unsigned int readycount = 0, ovlcount = 0, inputcount = 0;
   static unsigned int readysorted = 0, revcount = 0;
   static unsigned long seeksorted = 0, seeknosort = 0;

   if (link_statistics && !(++flushcount % link_statistics))
      printk("fc %d bc %d ic %d oc %d rc %d rs %d sc %d re %d"\
             " av %ldK as %ldK.\n", flushcount, batchcount, inputcount,
             ovlcount, readycount, readysorted, sortcount, revcount,
             seeknosort / (readycount + 1),
             seeksorted / (readycount + 1));

   if (n_ready <= 1) return FALSE;

   for (n = 0; n < n_ready; n++) {
      k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;

      if (!cpp->din) input_only = FALSE;

      if (SCpnt->request.sector < minsec) minsec = SCpnt->request.sector;
      if (SCpnt->request.sector > maxsec) maxsec = SCpnt->request.sector;

      sl[n] = SCpnt->request.sector;
      ioseek += SCpnt->request.nr_sectors;

      if (!n) continue;

      if (sl[n] < sl[n - 1]) s = FALSE;
      if (sl[n] > sl[n - 1]) r = FALSE;

      if (link_statistics) {
         if (sl[n] > sl[n - 1])
            seek += sl[n] - sl[n - 1];
         else
            seek += sl[n - 1] - sl[n];
         }

      }

   if (link_statistics) {
      if (cursec > sl[0]) seek += cursec - sl[0]; else seek += sl[0] - cursec;
      }

   if (cursec > ((maxsec + minsec) / 2)) rev = TRUE;

   if (ioseek > ((maxsec - minsec) / 2)) rev = FALSE;

   if (!((rev && r) || (!rev && s))) sort(sl, il, n_ready, rev);

   if (!input_only) for (n = 0; n < n_ready; n++) {
      k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;
      ll[n] = SCpnt->request.nr_sectors; pl[n] = SCpnt->pid;

      if (!n) continue;

      if ((sl[n] == sl[n - 1]) || (!rev && ((sl[n - 1] + ll[n - 1]) > sl[n]))
          || (rev && ((sl[n] + ll[n]) > sl[n - 1]))) overlap = TRUE;
      }

   if (overlap) sort(pl, il, n_ready, FALSE);

   if (link_statistics) {
      if (cursec > sl[0]) iseek = cursec - sl[0]; else iseek = sl[0] - cursec;
      batchcount++; readycount += n_ready, seeknosort += seek / 1024;
      if (input_only) inputcount++;
      if (overlap) { ovlcount++; seeksorted += iseek / 1024; }
      else seeksorted += (iseek + maxsec - minsec) / 1024;
      if (rev && !r)     {  revcount++; readysorted += n_ready; }
      if (!rev && !s)    { sortcount++; readysorted += n_ready; }
      }

#if defined (DEBUG_LINKED_COMMANDS)
   if (link_statistics && (overlap || !(flushcount % link_statistics)))
      for (n = 0; n < n_ready; n++) {
         k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;
         printk("%s %d.%d:%d pid %ld mb %d fc %d nr %d sec %ld ns %ld"\
                " cur %ld s:%c r:%c rev:%c in:%c ov:%c xd %d.\n",
                (ihdlr ? "ihdlr" : "qcomm"), SCpnt->channel, SCpnt->target,
                SCpnt->lun, SCpnt->pid, k, flushcount, n_ready,
                SCpnt->request.sector, SCpnt->request.nr_sectors, cursec,
                YESNO(s), YESNO(r), YESNO(rev), YESNO(input_only),
                YESNO(overlap), cpp->din);
         }
#endif
   return overlap;
}

static void flush_dev(Scsi_Device *dev, unsigned long cursec, unsigned int j,
                      unsigned int ihdlr) {
   Scsi_Cmnd *SCpnt;
   struct mscp *cpp;
   unsigned int k, n, n_ready = 0, il[MAX_MAILBOXES];

   for (k = 0; k < sh[j]->can_queue; k++) {

      if (HD(j)->cp_stat[k] != READY && HD(j)->cp_stat[k] != IN_USE) continue;

      cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;

      if (SCpnt->device != dev) continue;

      if (HD(j)->cp_stat[k] == IN_USE) return;

      il[n_ready++] = k;
      }

   if (reorder(j, cursec, ihdlr, il, n_ready)) n_ready = 1;

   for (n = 0; n < n_ready; n++) {
      k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;

      if (do_dma(sh[j]->io_port, (unsigned int) cpp, SEND_CP_DMA)) {
         printk("%s: %s, target %d.%d:%d, pid %ld, mbox %d, adapter"\
                " busy, will abort.\n", BN(j), (ihdlr ? "ihdlr" : "qcomm"),
                SCpnt->channel, SCpnt->target, SCpnt->lun, SCpnt->pid, k);
         HD(j)->cp_stat[k] = ABORTING;
         continue;
         }

      HD(j)->cp_stat[k] = IN_USE;
      }

}

static inline void ihdlr(int irq, unsigned int j) {
   Scsi_Cmnd *SCpnt;
   unsigned int i, k, c, status, tstatus, reg;
   struct mssp *dspp, *spp;
   struct mscp *cpp;

   if (sh[j]->irq != irq)
       panic("%s: ihdlr, irq %d, sh[j]->irq %d.\n", BN(j), irq, sh[j]->irq);

   /* Check if this board need to be serviced */
   if (!(inb(sh[j]->io_port + REG_AUX_STATUS) & IRQ_ASSERTED)) return;

   HD(j)->iocount++;

   if (do_trace) printk("%s: ihdlr, enter, irq %d, count %d.\n", BN(j), irq,
                        HD(j)->iocount);

   /* Check if this board is still busy */
   if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
      reg = inb(sh[j]->io_port + REG_STATUS);
      printk("%s: ihdlr, busy timeout error,  irq %d, reg 0x%x, count %d.\n",
             BN(j), irq, reg, HD(j)->iocount);
      return;
      }

   dspp = &HD(j)->sp[0];
   spp  = &HD(j)->sp[1];

   /* Make a local copy just before clearing the interrupt indication */
   memcpy(spp, dspp, sizeof(struct mssp));

   /* Clear the completion flag and cp pointer on the dynamic copy of sp */
   memset(dspp, 0, sizeof(struct mssp));

   /* Read the status register to clear the interrupt indication */
   reg = inb(sh[j]->io_port + REG_STATUS);

   /* Reject any sp with supspect data */
   if (spp->eoc == FALSE) 
      printk("%s: ihdlr, spp->eoc == FALSE, irq %d, reg 0x%x, count %d.\n",
             BN(j), irq, reg, HD(j)->iocount);
   if (spp->cpp == NULL) 
      printk("%s: ihdlr, spp->cpp == NULL,  irq %d, reg 0x%x, count %d.\n",
             BN(j), irq, reg, HD(j)->iocount);
   if (spp->eoc == FALSE || spp->cpp == NULL) return;

   cpp = spp->cpp;

   /* Find the mailbox to be serviced on this board */
   i = cpp - HD(j)->cp;

   if (cpp < HD(j)->cp || cpp >= HD(j)->cp + sh[j]->can_queue
                                     || i >= sh[j]->can_queue)
      panic("%s: ihdlr, invalid mscp bus address %p, cp0 %p.\n", BN(j),
            cpp, HD(j)->cp);

   if (HD(j)->cp_stat[i] == IGNORE) {
      HD(j)->cp_stat[i] = FREE;
      return;
      }
   else if (HD(j)->cp_stat[i] == LOCKED) {
      HD(j)->cp_stat[i] = FREE;
      printk("%s: ihdlr, mbox %d unlocked, count %d.\n", BN(j), i,
             HD(j)->iocount);
      return;
      }
   else if (HD(j)->cp_stat[i] == FREE) {
      printk("%s: ihdlr, mbox %d is free, count %d.\n", BN(j), i,
             HD(j)->iocount);
      return;
      }
   else if (HD(j)->cp_stat[i] == IN_RESET)
      printk("%s: ihdlr, mbox %d is in reset.\n", BN(j), i);
   else if (HD(j)->cp_stat[i] != IN_USE)
      panic("%s: ihdlr, mbox %d, invalid cp_stat: %d.\n",
            BN(j), i, HD(j)->cp_stat[i]);

   HD(j)->cp_stat[i] = FREE;
   SCpnt = cpp->SCpnt;

   if (SCpnt == NULL) panic("%s: ihdlr, mbox %d, SCpnt == NULL.\n", BN(j), i);

   if (SCpnt->host_scribble == NULL)
      panic("%s: ihdlr, mbox %d, pid %ld, SCpnt %p garbled.\n", BN(j), i,
            SCpnt->pid, SCpnt);

   if (*(unsigned int *)SCpnt->host_scribble != i)
      panic("%s: ihdlr, mbox %d, pid %ld, index mismatch %d.\n",
            BN(j), i, SCpnt->pid, *(unsigned int *)SCpnt->host_scribble);

   if (linked_comm && SCpnt->device->queue_depth > 2
                                     && TLDEV(SCpnt->device->type))
      flush_dev(SCpnt->device, SCpnt->request.sector, j, TRUE);

   tstatus = status_byte(spp->target_status);

   switch (spp->adapter_status) {
      case ASOK:     /* status OK */

         /* Forces a reset if a disk drive keeps returning BUSY */
         if (tstatus == BUSY && SCpnt->device->type != TYPE_TAPE)
            status = DID_ERROR << 16;

         /* If there was a bus reset, redo operation on each target */
         else if (tstatus != GOOD && SCpnt->device->type == TYPE_DISK
                  && HD(j)->target_redo[SCpnt->target][SCpnt->channel])
            status = DID_BUS_BUSY << 16;

         /* Works around a flaw in scsi.c */
         else if (tstatus == CHECK_CONDITION
                  && SCpnt->device->type == TYPE_DISK
                  && (SCpnt->sense_buffer[2] & 0xf) == RECOVERED_ERROR)
            status = DID_BUS_BUSY << 16;

         else
            status = DID_OK << 16;

         if (tstatus == GOOD)
            HD(j)->target_redo[SCpnt->target][SCpnt->channel] = FALSE;

         if (spp->target_status && SCpnt->device->type == TYPE_DISK)
            printk("%s: ihdlr, target %d.%d:%d, pid %ld, "\
                   "target_status 0x%x, sense key 0x%x.\n", BN(j),
                   SCpnt->channel, SCpnt->target, SCpnt->lun,
                   SCpnt->pid, spp->target_status,
                   SCpnt->sense_buffer[2]);

         HD(j)->target_to[SCpnt->target][SCpnt->channel] = 0;

         if (HD(j)->last_retried_pid == SCpnt->pid) HD(j)->retries = 0;

         break;
      case ASST:     /* Selection Time Out */
      case 0x02:     /* Command Time Out   */

         if (HD(j)->target_to[SCpnt->target][SCpnt->channel] > 1)
            status = DID_ERROR << 16;
         else {
            status = DID_TIME_OUT << 16;
            HD(j)->target_to[SCpnt->target][SCpnt->channel]++;
            }

         break;

      /* Perform a limited number of internal retries */
      case 0x03:     /* SCSI Bus Reset Received */
      case 0x04:     /* Initial Controller Power-up */

         for (c = 0; c <= sh[j]->max_channel; c++)
            for (k = 0; k < sh[j]->max_id; k++)
               HD(j)->target_redo[k][c] = TRUE;

         if (SCpnt->device->type != TYPE_TAPE
             && HD(j)->retries < MAX_INTERNAL_RETRIES) {
            status = DID_BUS_BUSY << 16;
            HD(j)->retries++;
            HD(j)->last_retried_pid = SCpnt->pid;
            }
         else
            status = DID_ERROR << 16;

         break;
      case 0x05:     /* Unexpected Bus Phase */
      case 0x06:     /* Unexpected Bus Free */
      case 0x07:     /* Bus Parity Error */
      case 0x08:     /* SCSI Hung */
      case 0x09:     /* Unexpected Message Reject */
      case 0x0a:     /* SCSI Bus Reset Stuck */
      case 0x0b:     /* Auto Request-Sense Failed */
      case 0x0c:     /* Controller Ram Parity Error */
      default:
         status = DID_ERROR << 16;
         break;
      }

   SCpnt->result = status | spp->target_status;

#if defined (DEBUG_INTERRUPT)
   if (SCpnt->result || do_trace)
#else
   if ((spp->adapter_status != ASOK && HD(j)->iocount >  1000) ||
       (spp->adapter_status != ASOK &&
        spp->adapter_status != ASST && HD(j)->iocount <= 1000) ||
        do_trace || msg_byte(spp->target_status))
#endif
      printk("%s: ihdlr, mbox %2d, err 0x%x:%x,"\
             " target %d.%d:%d, pid %ld, reg 0x%x, count %d.\n",
             BN(j), i, spp->adapter_status, spp->target_status,
             SCpnt->channel, SCpnt->target, SCpnt->lun, SCpnt->pid,
             reg, HD(j)->iocount);

   /* Set the command state to inactive */
   SCpnt->host_scribble = NULL;

   SCpnt->scsi_done(SCpnt);

   if (do_trace) printk("%s: ihdlr, exit, irq %d, count %d.\n", BN(j), irq,
                        HD(j)->iocount);

   return;
}

static void do_interrupt_handler(int irq, void *shap, struct pt_regs *regs) {

   unsigned int j;

   /* Check if the interrupt must be processed by this handler */
   if ((j = (unsigned int)((char *)shap - sha)) >= num_boards) return;

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,95)
   {
   unsigned long flags;
   spin_lock_irqsave(&io_request_lock, flags);
   ihdlr(irq, j);
   spin_unlock_irqrestore(&io_request_lock, flags);
   }
#else
   ihdlr(irq, j);
#endif

}

int eata2x_release(struct Scsi_Host *shpnt) {
   unsigned long flags;
   unsigned int i, j;

   save_flags(flags);
   cli();

   for (j = 0; sh[j] != NULL && sh[j] != shpnt; j++);

   if (sh[j] == NULL) panic("%s: release, invalid Scsi_Host pointer.\n",
                            driver_name);

   for (i = 0; i < sh[j]->can_queue; i++)
      if ((&HD(j)->cp[i])->sglist) kfree((&HD(j)->cp[i])->sglist);

   free_irq(sh[j]->irq, &sha[j]);

   if (sh[j]->dma_channel != NO_DMA) free_dma(sh[j]->dma_channel);

   release_region(sh[j]->io_port, sh[j]->n_io_port);
   scsi_unregister(sh[j]);
   restore_flags(flags);
   return FALSE;
}

#if defined(MODULE)
Scsi_Host_Template driver_template = EATA;

#include "scsi_module.c"
#endif
