text: /*
   *      eata.c - Low-level driver for EATA/DMA SCSI host adapters.
   *
   *      03 Jun 2003 Rev. 8.10 for linux-2.5.70
   *        + Update for new IRQ API.
   *        + Use "goto" when appropriate.
   *        + Drop eata.h.
   *        + Update for new module_param API.
   *        + Module parameters  can now be specified only in the
   *          same format as the kernel boot options.
   *
   *             boot option    old module param 
   *             -----------    ------------------
   *             addr,...       io_port=addr,...
   *             lc:[y|n]       linked_comm=[1|0]
   *             mq:xx          max_queue_depth=xx
   *             tm:[0|1|2]     tag_mode=[0|1|2]
   *             et:[y|n]       ext_tran=[1|0]
   *             rs:[y|n]       rev_scan=[1|0]
   *             ip:[y|n]       isa_probe=[1|0]
   *             ep:[y|n]       eisa_probe=[1|0]
   *             pp:[y|n]       pci_probe=[1|0]
   *
   *          A valid example using the new parameter format is:
   *          modprobe eata "eata=0x7410,0x230,lc:y,tm:0,mq:4,ep:n"
   *
   *          which is equivalent to the old format:
   *          modprobe eata io_port=0x7410,0x230 linked_comm=1 tag_mode=0 \
   *                        max_queue_depth=4 eisa_probe=0
   *
   *      12 Feb 2003 Rev. 8.04 for linux 2.5.60
   *        + Release irq before calling scsi_register.
   *
   *      12 Nov 2002 Rev. 8.02 for linux 2.5.47
   *        + Release driver_lock before calling scsi_register.
   *
   *      11 Nov 2002 Rev. 8.01 for linux 2.5.47
   *        + Fixed bios_param and scsicam_bios_param calling parameters.
   *
   *      28 Oct 2002 Rev. 8.00 for linux 2.5.44-ac4
   *        + Use new tcq and adjust_queue_depth api.
   *        + New command line option (tm:[0-2]) to choose the type of tags:
   *          0 -> disable tagging ; 1 -> simple tags  ; 2 -> ordered tags.
   *          Default is tm:0 (tagged commands disabled).
   *          For compatibility the "tc:" option is an alias of the "tm:"
   *          option; tc:n is equivalent to tm:0 and tc:y is equivalent to
   *          tm:1.
   *        + The tagged_comm module parameter has been removed, use tag_mode
   *          instead, equivalent to the "tm:" boot option.
   *
   *      10 Oct 2002 Rev. 7.70 for linux 2.5.42
   *        + Foreport from revision 6.70.
   *
   *      25 Jun 2002 Rev. 6.70 for linux 2.4.19
   *        + This release is the first one tested on a Big Endian platform:
   *          fixed endian-ness problem due to bitfields;
   *          fixed endian-ness problem in read_pio.
   *        + Added new options for selectively probing ISA, EISA and PCI bus:
   *
   *          Boot option   Parameter name    Default according to
   *
   *          ip:[y|n]      isa_probe=[1|0]   CONFIG_ISA  defined
   *          ep:[y|n]      eisa_probe=[1|0]  CONFIG_EISA defined
   *          pp:[y|n]      pci_probe=[1|0]   CONFIG_PCI  defined
   *
   *          The default action is to perform probing if the corrisponding
   *          bus is configured and to skip probing otherwise.
   *
   *        + If pci_probe is in effect and a list of I/O  ports is specified
   *          as parameter or boot option, pci_enable_device() is performed
   *          on all pci devices matching PCI_CLASS_STORAGE_SCSI.
   *
   *      21 Feb 2002 Rev. 6.52 for linux 2.4.18
   *        + Backport from rev. 7.22 (use io_request_lock).
   *
   *      20 Feb 2002 Rev. 7.22 for linux 2.5.5
   *        + Remove any reference to virt_to_bus().
   *        + Fix pio hang while detecting multiple HBAs.
   *        + Fixed a board detection bug: in a system with
   *          multiple ISA/EISA boards, all but the first one
   *          were erroneously detected as PCI.
   *
   *      01 Jan 2002 Rev. 7.20 for linux 2.5.1
   *        + Use the dynamic DMA mapping API.
   *
   *      19 Dec 2001 Rev. 7.02 for linux 2.5.1
   *        + Use SCpnt->sc_data_direction if set.
   *        + Use sglist.page instead of sglist.address.
   *
   *      11 Dec 2001 Rev. 7.00 for linux 2.5.1
   *        + Use host->host_lock instead of io_request_lock.
   *
   *       1 May 2001 Rev. 6.05 for linux 2.4.4
   *        + Clean up all pci related routines.
   *        + Fix data transfer direction for opcode SEND_CUE_SHEET (0x5d)
   *
   *      30 Jan 2001 Rev. 6.04 for linux 2.4.1
   *        + Call pci_resource_start after pci_enable_device.
   *
   *      25 Jan 2001 Rev. 6.03 for linux 2.4.0
   *        + "check_region" call replaced by "request_region".
   *
   *      22 Nov 2000 Rev. 6.02 for linux 2.4.0-test11
   *        + Return code checked when calling pci_enable_device.
   *        + Removed old scsi error handling support.
   *        + The obsolete boot option flag eh:n is silently ignored.
   *        + Removed error messages while a disk drive is powered up at
   *          boot time.
   *        + Improved boot messages: all tagged capable device are
   *          indicated as "tagged" or "soft-tagged" :
   *          - "soft-tagged"  means that the driver is trying to do its
   *            own tagging (i.e. the tc:y option is in effect);
   *          - "tagged" means that the device supports tagged commands,
   *            but the driver lets the HBA be responsible for tagging
   *            support.
   *
   *      16 Sep 1999 Rev. 5.11 for linux 2.2.12 and 2.3.18
   *        + Updated to the new __setup interface for boot command line options.
   *        + When loaded as a module, accepts the new parameter boot_options
   *          which value is a string with the same format of the kernel boot
   *          command line options. A valid example is:
   *          modprobe eata 'boot_options="0x7410,0x230,lc:y,tc:n,mq:4"'
   *
   *       9 Sep 1999 Rev. 5.10 for linux 2.2.12 and 2.3.17
   *        + 64bit cleanup for Linux/Alpha platform support
   *          (contribution from H.J. Lu).
   *
   *      22 Jul 1999 Rev. 5.00 for linux 2.2.10 and 2.3.11
   *        + Removed pre-2.2 source code compatibility.
   *        + Added call to pci_set_master.
   *
   *      26 Jul 1998 Rev. 4.33 for linux 2.0.35 and 2.1.111
   *        + Added command line option (rs:[y|n]) to reverse the scan order
   *          of PCI boards. The default is rs:y, which reverses the BIOS order
   *          while registering PCI boards. The default value rs:y generates
   *          the same order of all previous revisions of this driver.
   *          Pls. note that "BIOS order" might have been reversed itself
   *          after the 2.1.9x PCI modifications in the linux kernel.
   *          The rs value is ignored when the explicit list of addresses
   *          is used by the "eata=port0,port1,..." command line option.
   *        + Added command line option (et:[y|n]) to force use of extended
   *          translation (255 heads, 63 sectors) as disk geometry.
   *          The default is et:n, which uses the disk geometry returned
   *          by scsicam_bios_param. The default value et:n is compatible with
   *          all previous revisions of this driver.
   *
   *      28 May 1998 Rev. 4.32 for linux 2.0.33 and 2.1.104
   *          Increased busy timeout from 10 msec. to 200 msec. while
   *          processing interrupts.
   *
   *      16 May 1998 Rev. 4.31 for linux 2.0.33 and 2.1.102
   *          Improved abort handling during the eh recovery process.
   *
   *      13 May 1998 Rev. 4.30 for linux 2.0.33 and 2.1.101
   *          The driver is now fully SMP safe, including the
   *          abort and reset routines.
   *          Added command line options (eh:[y|n]) to choose between
   *          new_eh_code and the old scsi code.
   *          If linux version >= 2.1.101 the default is eh:y, while the eh
   *          option is ignored for previous releases and the old scsi code
   *          is used.
   *
   *      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) 1994-2003 Dario Ballabio (ballabio_dario@emc.com)
   *
   *  Alternate email: dario.ballabio@inwind.it, dario.ballabio@tiscalinet.it
   *
   *  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)
   *  PM33340UW  -  SmartRAID Adapter for PCI  ultra wide multichannel
   *
   *  The above list is just an indication: as a matter of fact all DPT
   *  boards using the EATA/DMA protocol are supported by this driver,
   *  since they use exactely the same programming interface.
   *
   *  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 than 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:
   *
   *  et:y  force use of extended translation (255 heads, 63 sectors);
   *  et:n  use disk geometry detected by scsicam_bios_param;
   *  rs:y  reverse scan order while detecting PCI boards;
   *  rs:n  use BIOS order while detecting PCI boards;
   *  lc:y  enables linked commands;
   *  lc:n  disables linked commands;
   *  tm:0  disables tagged commands (same as tc:n);
   *  tm:1  use simple queue tags (same as tc:y);
   *  tm:2  use ordered queue tags (same as tc:2);
   *  mq:xx set the max queue depth to the value xx (2 <= xx <= 32).
   *
   *  The default value is: "eata=lc:n,mq:16,tm:0,et:n,rs:n".
   *  An example using the list of detection probes could be:
   *  "eata=0x7410,0x230,lc:y,tm:2,mq:4,et:n".
   *
   *  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 \
   *                max_queue_depth=4 ext_tran=0 tag_mode=2 \
   *                rev_scan=1
   *
   *  ----------------------------------------------------------------------------
   *  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 extended translation option (et:y) is useful when using large physical
   *  disks/arrays. It could also be useful when switching between Adaptec boards
   *  and DPT boards without reformatting the disk.
   *  When a boot disk is partitioned with extended translation, in order to
   *  be able to boot it with a DPT board is could be necessary to add to
   *  lilo.conf additional commands as in the following example:
   *
   *  fix-table
   *  disk=/dev/sda bios=0x80 sectors=63 heads=128 cylindres=546
   *
   *  where the above geometry should be replaced with the one reported at
   *  power up by the DPT controller.
   *  ----------------------------------------------------------------------------
   *
   *  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 = 1 for all ISA boards.
   */
  
  #include <linux/string.h>
  #include <linux/kernel.h>
  #include <linux/ioport.h>
  #include <linux/delay.h>
  #include <linux/proc_fs.h>
  #include <linux/blkdev.h>
  #include <linux/interrupt.h>
  #include <linux/stat.h>
  #include <linux/pci.h>
  #include <linux/init.h>
  #include <linux/ctype.h>
  #include <linux/spinlock.h>
  #include <linux/dma-mapping.h>
  #include <linux/slab.h>
  #include <asm/byteorder.h>
  #include <asm/dma.h>
  #include <asm/io.h>
  #include <asm/irq.h>
  
  #include <scsi/scsi.h>
  #include <scsi/scsi_cmnd.h>
  #include <scsi/scsi_device.h>
  #include <scsi/scsi_host.h>
  #include <scsi/scsi_tcq.h>
  #include <scsi/scsicam.h>
  
  static int eata2x_detect(struct scsi_host_template *);
  static int eata2x_release(struct Scsi_Host *);
  static int eata2x_queuecommand(struct scsi_cmnd *,
  			       void (*done) (struct scsi_cmnd *));
  static int eata2x_eh_abort(struct scsi_cmnd *);
  static int eata2x_eh_host_reset(struct scsi_cmnd *);
  static int eata2x_bios_param(struct scsi_device *, struct block_device *,
  			     sector_t, int *);
  static int eata2x_slave_configure(struct scsi_device *);
  
  static struct scsi_host_template driver_template = {
  	.name = "EATA/DMA 2.0x rev. 8.10.00 ",
  	.detect = eata2x_detect,
  	.release = eata2x_release,
  	.queuecommand = eata2x_queuecommand,
  	.eh_abort_handler = eata2x_eh_abort,
  	.eh_host_reset_handler = eata2x_eh_host_reset,
  	.bios_param = eata2x_bios_param,
  	.slave_configure = eata2x_slave_configure,
  	.this_id = 7,
  	.unchecked_isa_dma = 1,
  	.use_clustering = ENABLE_CLUSTERING,
  };
  
  #if !defined(__BIG_ENDIAN_BITFIELD) && !defined(__LITTLE_ENDIAN_BITFIELD)
  #error "Adjust your <asm/byteorder.h> defines"
  #endif
  
  /* 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
  #undef  DEBUG_GENERATE_ERRORS
  #undef  DEBUG_GENERATE_ABORTS
  #undef  DEBUG_GEOMETRY
  
  #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 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_DISABLED 0
  #define TAG_SIMPLE   1
  #define TAG_ORDERED  2
  
  #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     9UL
  #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 YESNO(a) ((a) ? 'y' : 'n')
  #define TLDEV(type) ((type) == TYPE_DISK || (type) == TYPE_ROM)
  
  /* "EATA", in Big Endian format */
  #define EATA_SIG_BE 0x45415441
  
  /* 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 {
  	u_int32_t data_len;	/* Number of valid bytes after this field */
  	u_int32_t sign;		/* ASCII "EATA" signature */
  
  #if defined(__BIG_ENDIAN_BITFIELD)
  	unchar version	: 4,
  	       		: 4;
  	unchar haaval	: 1,
  	       ata	: 1,
  	       drqvld	: 1,
  	       dmasup	: 1,
  	       morsup	: 1,
  	       trnxfr	: 1,
  	       tarsup	: 1,
  	       ocsena	: 1;
  #else
  	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 */
  #endif
  
  	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 */
  	u_int32_t cp_len;	/* Number of valid bytes in cp */
  	u_int32_t 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 */
  
  #if defined(__BIG_ENDIAN_BITFIELD)
  	unchar drqx	: 2,
  	       second	: 1,
  	       irq_tr	: 1,
  	       irq	: 4;
  	unchar sync;
  	unchar		: 4,
  	       res1	: 1,
  	       large_sg	: 1,
  	       forcaddr	: 1,
  	       isaena	: 1;
  	unchar max_chan	: 3,
  	       max_id	: 5;
  	unchar max_lun;
  	unchar eisa	: 1,
  	       pci	: 1,
  	       idquest	: 1,
  	       m1	: 1,
  	       		: 4;
  #else
  	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 */
  #endif
  
  	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 */
  
  #if defined(__BIG_ENDIAN_BITFIELD)
  	unchar		: 4,
  	       tarena	: 1,
  	       mdpena	: 1,
  	       ocena	: 1,
  	       edis	: 1;
  #else
  	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;
  #endif
  	unchar cpad[511];
  };
  
  /* Returned status packet structure */
  struct mssp {
  #if defined(__BIG_ENDIAN_BITFIELD)
  	unchar eoc	: 1,
  	       adapter_status : 7;
  #else
  	unchar adapter_status : 7,	/* State related to current command */
  	       eoc	: 1;		/* End Of Command (1 = command completed) */
  #endif
  	unchar target_status;	/* SCSI status received after data transfer */
  	unchar unused[2];
  	u_int32_t inv_res_len;	/* Number of bytes not transferred */
  	u_int32_t cpp_index;	/* Index of 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 {
  #if defined(__BIG_ENDIAN_BITFIELD)
  	unchar din	: 1,
  	       dout	: 1,
  	       interp	: 1,
  	       		: 1,
  		sg	: 1,
  		reqsen	:1,
  		init	: 1,
  		sreset	: 1;
  	unchar sense_len;
  	unchar unused[3];
  	unchar		: 7,
  	       fwnest	: 1;
  	unchar		: 5,
  	       hbaci	: 1,
  	       iat	: 1,
  	       phsunit	: 1;
  	unchar channel	: 3,
  	       target	: 5;
  	unchar one	: 1,
  	       dispri	: 1,
  	       luntar	: 1,
  	       lun	: 5;
  #else
  	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 */
  #endif
  
  	unchar mess[3];		/* Massage to/from Target */
  	unchar cdb[12];		/* Command Descriptor Block */
  	u_int32_t data_len;	/* If sg=0 Data Length, if sg=1 sglist length */
  	u_int32_t cpp_index;	/* Index of address to be returned in sp */
  	u_int32_t data_address;	/* If sg=0 Data Address, if sg=1 sglist address */
  	u_int32_t sp_dma_addr;	/* Address where sp is DMA'ed when cp completes */
  	u_int32_t sense_addr;	/* Address where Sense Data is DMA'ed on error */
  
  	/* Additional fields begin here. */
  	struct scsi_cmnd *SCpnt;
  
  	/* All the cp structure is zero filled by queuecommand except the
  	   following CP_TAIL_SIZE bytes, initialized by detect */
  	dma_addr_t cp_dma_addr;	/* dma handle for this cp structure */
  	struct sg_list *sglist;	/* pointer to the allocated SG list */
  };
  
  #define CP_TAIL_SIZE (sizeof(struct sglist *) + sizeof(dma_addr_t))
  
  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 */
  	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 1 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' */
  	unsigned char is_pci;	/* 1 is bus type is PCI */
  	struct pci_dev *pdev;	/* pdev for PCI bus, NULL otherwise */
  	struct mssp *sp_cpu_addr;	/* cpu addr for DMA buffer sp */
  	dma_addr_t sp_dma_addr;	/* dma handle for DMA buffer sp */
  	struct mssp sp;		/* Local copy of sp buffer */
  };
  
  static struct Scsi_Host *sh[MAX_BOARDS];
  static const char *driver_name = "EATA";
  static char sha[MAX_BOARDS];
  static DEFINE_SPINLOCK(driver_lock);
  
  /* 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[] = {
  
  	/* 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
  };
  
  /* Device is Big Endian */
  #define H2DEV(x)   cpu_to_be32(x)
  #define DEV2H(x)   be32_to_cpu(x)
  #define H2DEV16(x) cpu_to_be16(x)
  #define DEV2H16(x) be16_to_cpu(x)
  
  /* But transfer orientation from the 16 bit data register is Little Endian */
  #define REG2H(x)   le16_to_cpu(x)
  
  static irqreturn_t do_interrupt_handler(int, void *);
  static void flush_dev(struct scsi_device *, unsigned long, struct hostdata *,
  		      unsigned int);
  static int do_trace = 0;
  static int setup_done = 0;
  static int link_statistics;
  static int ext_tran = 0;
  static int rev_scan = 1;
  
  #if defined(CONFIG_SCSI_EATA_TAGGED_QUEUE)
  static int tag_mode = TAG_SIMPLE;
  #else
  static int tag_mode = TAG_DISABLED;
  #endif
  
  #if defined(CONFIG_SCSI_EATA_LINKED_COMMANDS)
  static int linked_comm = 1;
  #else
  static int linked_comm = 0;
  #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
  
  #if defined(CONFIG_ISA)
  static int isa_probe = 1;
  #else
  static int isa_probe = 0;
  #endif
  
  #if defined(CONFIG_EISA)
  static int eisa_probe = 1;
  #else
  static int eisa_probe = 0;
  #endif
  
  #if defined(CONFIG_PCI)
  static int pci_probe = 1;
  #else
  static int pci_probe = 0;
  #endif
  
  #define MAX_INT_PARAM 10
  #define MAX_BOOT_OPTIONS_SIZE 256
  static char boot_options[MAX_BOOT_OPTIONS_SIZE];
  
  #if defined(MODULE)
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  
  module_param_string(eata, boot_options, MAX_BOOT_OPTIONS_SIZE, 0);
  MODULE_PARM_DESC(eata, " equivalent to the \"eata=...\" kernel boot option."
  		 "            Example: modprobe eata \"eata=0x7410,0x230,lc:y,tm:0,mq:4,ep:n\"");
  MODULE_AUTHOR("Dario Ballabio");
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("EATA/DMA SCSI Driver");
  
  #endif
  
  static int eata2x_slave_configure(struct scsi_device *dev)
  {
  	int tqd, utqd;
  	char *tag_suffix, *link_suffix;
  
  	utqd = MAX_CMD_PER_LUN;
  	tqd = max_queue_depth;
  
  	if (TLDEV(dev->type) && dev->tagged_supported) {
  		if (tag_mode == TAG_SIMPLE) {
  			scsi_adjust_queue_depth(dev, MSG_SIMPLE_TAG, tqd);
  			tag_suffix = ", simple tags";
  		} else if (tag_mode == TAG_ORDERED) {
  			scsi_adjust_queue_depth(dev, MSG_ORDERED_TAG, tqd);
  			tag_suffix = ", ordered tags";
  		} else {
  			scsi_adjust_queue_depth(dev, 0, tqd);
  			tag_suffix = ", no tags";
  		}
  	} else if (TLDEV(dev->type) && linked_comm) {
  		scsi_adjust_queue_depth(dev, 0, tqd);
  		tag_suffix = ", untagged";
  	} else {
  		scsi_adjust_queue_depth(dev, 0, utqd);
  		tag_suffix = "";
  	}
  
  	if (TLDEV(dev->type) && linked_comm && dev->queue_depth > 2)
  		link_suffix = ", sorted";
  	else if (TLDEV(dev->type))
  		link_suffix = ", unsorted";
  	else
  		link_suffix = "";
  
  	sdev_printk(KERN_INFO, dev,
  		"cmds/lun %d%s%s.\n",
  	       dev->queue_depth, link_suffix, tag_suffix);
  
  	return 0;
  }
  
  static int wait_on_busy(unsigned long iobase, unsigned int loop)
  {
  	while (inb(iobase + REG_AUX_STATUS) & ABSY_ASSERTED) {
  		udelay(1L);
  		if (--loop == 0)
  			return 1;
  	}
  	return 0;
  }
  
  static int do_dma(unsigned long iobase, unsigned long addr, unchar cmd)
  {
  	unsigned char *byaddr;
  	unsigned long devaddr;
  
  	if (wait_on_busy(iobase, (addr ? MAXLOOP * 100 : MAXLOOP)))
  		return 1;
  
  	if (addr) {
  		devaddr = H2DEV(addr);
  		byaddr = (unsigned char *)&devaddr;
  		outb(byaddr[3], iobase + REG_LOW);
  		outb(byaddr[2], iobase + REG_LM);
  		outb(byaddr[1], iobase + REG_MID);
  		outb(byaddr[0], iobase + REG_MSB);
  	}
  
  	outb(cmd, iobase + REG_CMD);
  	return 0;
  }
  
  static 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 1;
  		}
  		loop = MAXLOOP;
  		*p = REG2H(inw(iobase));
  	}
  
  	return 0;
  }
  
  static struct pci_dev *get_pci_dev(unsigned long port_base)
  {
  #if defined(CONFIG_PCI)
  	unsigned int addr;
  	struct pci_dev *dev = NULL;
  
  	while ((dev = pci_get_class(PCI_CLASS_STORAGE_SCSI << 8, dev))) {
  		addr = pci_resource_start(dev, 0);
  
  #if defined(DEBUG_PCI_DETECT)
  		printk("%s: get_pci_dev, bus %d, devfn 0x%x, addr 0x%x.\n",
  		       driver_name, dev->bus->number, dev->devfn, addr);
  #endif
  
  		/* we are in so much trouble for a pci hotplug system with this driver
  		 * anyway, so doing this at least lets people unload the driver and not
  		 * cause memory problems, but in general this is a bad thing to do (this
  		 * driver needs to be converted to the proper PCI api someday... */
  		pci_dev_put(dev);
  		if (addr + PCI_BASE_ADDRESS_0 == port_base)
  			return dev;
  	}
  #endif				/* end CONFIG_PCI */
  	return NULL;
  }
  
  static void enable_pci_ports(void)
  {
  #if defined(CONFIG_PCI)
  	struct pci_dev *dev = NULL;
  
  	while ((dev = pci_get_class(PCI_CLASS_STORAGE_SCSI << 8, dev))) {
  #if defined(DEBUG_PCI_DETECT)
  		printk("%s: enable_pci_ports, bus %d, devfn 0x%x.\n",
  		       driver_name, dev->bus->number, dev->devfn);
  #endif
  
  		if (pci_enable_device(dev))
  			printk
  			    ("%s: warning, pci_enable_device failed, bus %d devfn 0x%x.\n",
  			     driver_name, dev->bus->number, dev->devfn);
  	}
  
  #endif				/* end CONFIG_PCI */
  }
  
  static int port_detect(unsigned long port_base, unsigned int j,
  		struct scsi_host_template *tpnt)
  {
  	unsigned char irq, dma_channel, subversion, i, is_pci = 0;
  	unsigned char protocol_rev;
  	struct eata_info info;
  	char *bus_type, dma_name[16];
  	struct pci_dev *pdev;
  	/* Allowed DMA channels for ISA (0 indicates reserved) */
  	unsigned char dma_channel_table[4] = { 5, 6, 7, 0 };
  	struct Scsi_Host *shost;
  	struct hostdata *ha;
  	char name[16];
  
  	sprintf(name, "%s%d", driver_name, j);
  
  	if (!request_region(port_base, REGION_SIZE, driver_name)) {
  #if defined(DEBUG_DETECT)
  		printk("%s: address 0x%03lx in use, skipping probe.\n", name,
  		       port_base);
  #endif
  		goto fail;
  	}
  
  	spin_lock_irq(&driver_lock);
  
  	if (do_dma(port_base, 0, READ_CONFIG_PIO)) {
  #if defined(DEBUG_DETECT)
  		printk("%s: detect, do_dma failed at 0x%03lx.\n", name,
  		       port_base);
  #endif
  		goto freelock;
  	}
  
  	/* Read the info structure */
  	if (read_pio(port_base, (ushort *) & info, (ushort *) & info.ipad[0])) {
  #if defined(DEBUG_DETECT)
  		printk("%s: detect, read_pio failed at 0x%03lx.\n", name,
  		       port_base);
  #endif
  		goto freelock;
  	}
  
  	info.data_len = DEV2H(info.data_len);
  	info.sign = DEV2H(info.sign);
  	info.cp_pad_len = DEV2H16(info.cp_pad_len);
  	info.cp_len = DEV2H(info.cp_len);
  	info.sp_len = DEV2H(info.sp_len);
  	info.scatt_size = DEV2H16(info.scatt_size);
  	info.queue_size = DEV2H16(info.queue_size);
  
  	/* Check the controller "EATA" signature */
  	if (info.sign != EATA_SIG_BE) {
  #if defined(DEBUG_DETECT)
  		printk("%s: signature 0x%04x discarded.\n", name, info.sign);
  #endif
  		goto freelock;
  	}
  
  	if (info.data_len < EATA_2_0A_SIZE) {
  		printk
  		    ("%s: config structure size (%d bytes) too short, detaching.\n",
  		     name, info.data_len);
  		goto freelock;
  	} else if (info.data_len == EATA_2_0A_SIZE)
  		protocol_rev = 'A';
  	else if (info.data_len == EATA_2_0B_SIZE)
  		protocol_rev = 'B';
  	else
  		protocol_rev = 'C';
  
  	if (protocol_rev != 'A' && info.forcaddr) {
  		printk("%s: warning, port address has been forced.\n", name);
  		bus_type = "PCI";
  		is_pci = 1;
  		subversion = ESA;
  	} else if (port_base > MAX_EISA_ADDR
  		   || (protocol_rev == 'C' && info.pci)) {
  		bus_type = "PCI";
  		is_pci = 1;
  		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";
  		is_pci = 1;
  		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);
  		goto freelock;
  	}
  
  	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 (is_pci) {
  		pdev = get_pci_dev(port_base);
  		if (!pdev)
  			printk
  			    ("%s: warning, failed to get pci_dev structure.\n",
  			     name);
  	} else
  		pdev = NULL;
  
  	if (pdev && (irq != pdev->irq)) {
  		printk("%s: IRQ %u mapped to IO-APIC IRQ %u.\n", name, irq,
  		       pdev->irq);
  		irq = pdev->irq;
  	}
  
  	/* Board detected, allocate its IRQ */
  	if (request_irq(irq, do_interrupt_handler,
  			IRQF_DISABLED | ((subversion == ESA) ? IRQF_SHARED : 0),
  			driver_name, (void *)&sha[j])) {
  		printk("%s: unable to allocate IRQ %u, detaching.\n", name,
  		       irq);
  		goto freelock;
  	}
  
  	if (subversion == ISA && request_dma(dma_channel, driver_name)) {
  		printk("%s: unable to allocate DMA channel %u, detaching.\n",
  		       name, dma_channel);
  		goto freeirq;
  	}
  #if defined(FORCE_CONFIG)
  	{
  		struct eata_config *cf;
  		dma_addr_t cf_dma_addr;
  
  		cf = pci_alloc_consistent(pdev, sizeof(struct eata_config),
  					  &cf_dma_addr);
  
  		if (!cf) {
  			printk
  			    ("%s: config, pci_alloc_consistent failed, detaching.\n",
  			     name);
  			goto freedma;
  		}
  
  		/* Set board configuration */
  		memset((char *)cf, 0, sizeof(struct eata_config));
  		cf->len = (ushort) H2DEV16((ushort) 510);
  		cf->ocena = 1;
  
  		if (do_dma(port_base, cf_dma_addr, SET_CONFIG_DMA)) {
  			printk
  			    ("%s: busy timeout sending configuration, detaching.\n",
  			     name);
  			pci_free_consistent(pdev, sizeof(struct eata_config),
  					    cf, cf_dma_addr);
  			goto freedma;
  		}
  
  	}
  #endif
  
  	spin_unlock_irq(&driver_lock);
  	sh[j] = shost = scsi_register(tpnt, sizeof(struct hostdata));
  	spin_lock_irq(&driver_lock);
  
  	if (shost == NULL) {
  		printk("%s: unable to register host, detaching.\n", name);
  		goto freedma;
  	}
  
  	shost->io_port = port_base;
  	shost->unique_id = port_base;
  	shost->n_io_port = REGION_SIZE;
  	shost->dma_channel = dma_channel;
  	shost->irq = irq;
  	shost->sg_tablesize = (ushort) info.scatt_size;
  	shost->this_id = (ushort) info.host_addr[3];
  	shost->can_queue = (ushort) info.queue_size;
  	shost->cmd_per_lun = MAX_CMD_PER_LUN;
  
  	ha = (struct hostdata *)shost->hostdata;
  	
  	memset(ha, 0, sizeof(struct hostdata));
  	ha->subversion = subversion;
  	ha->protocol_rev = protocol_rev;
  	ha->is_pci = is_pci;
  	ha->pdev = pdev;
  	ha->board_number = j;
  
  	if (ha->subversion == ESA)
  		shost->unchecked_isa_dma = 0;
  	else {
  		unsigned long flags;
  		shost->unchecked_isa_dma = 1;
  
  		flags = claim_dma_lock();
  		disable_dma(dma_channel);
  		clear_dma_ff(dma_channel);
  		set_dma_mode(dma_channel, DMA_MODE_CASCADE);
  		enable_dma(dma_channel);
  		release_dma_lock(flags);
  
  	}
  
  	strcpy(ha->board_name, name);
  
  	/* DPT PM2012 does not allow to detect sg_tablesize correctly */
  	if (shost->sg_tablesize > MAX_SGLIST || shost->sg_tablesize < 2) {
  		printk("%s: detect, wrong n. of SG lists %d, fixed.\n",
  		       ha->board_name, shost->sg_tablesize);
  		shost->sg_tablesize = MAX_SGLIST;
  	}
  
  	/* DPT PM2012 does not allow to detect can_queue correctly */
  	if (shost->can_queue > MAX_MAILBOXES || shost->can_queue < 2) {
  		printk("%s: detect, wrong n. of mbox %d, fixed.\n",
  		       ha->board_name, shost->can_queue);
  		shost->can_queue = MAX_MAILBOXES;
  	}
  
  	if (protocol_rev != 'A') {
  		if (info.max_chan > 0 && info.max_chan < MAX_CHANNEL)
  			shost->max_channel = info.max_chan;
  
  		if (info.max_id > 7 && info.max_id < MAX_TARGET)
  			shost->max_id = info.max_id + 1;
  
  		if (info.large_sg && shost->sg_tablesize == MAX_SGLIST)
  			shost->sg_tablesize = MAX_LARGE_SGLIST;
  	}
  
  	if (protocol_rev == 'C') {
  		if (info.max_lun > 7 && info.max_lun < MAX_LUN)
  			shost->max_lun = info.max_lun + 1;
  	}
  
  	if (dma_channel == NO_DMA)
  		sprintf(dma_name, "%s", "BMST");
  	else
  		sprintf(dma_name, "DMA %u", dma_channel);
  
  	spin_unlock_irq(&driver_lock);
  
  	for (i = 0; i < shost->can_queue; i++)
  		ha->cp[i].cp_dma_addr = pci_map_single(ha->pdev,
  							  &ha->cp[i],
  							  sizeof(struct mscp),
  							  PCI_DMA_BIDIRECTIONAL);
  
  	for (i = 0; i < shost->can_queue; i++) {
  		size_t sz = shost->sg_tablesize *sizeof(struct sg_list);
  		gfp_t gfp_mask = (shost->unchecked_isa_dma ? GFP_DMA : 0) | GFP_ATOMIC;
  		ha->cp[i].sglist = kmalloc(sz, gfp_mask);
  		if (!ha->cp[i].sglist) {
  			printk
  			    ("%s: kmalloc SGlist failed, mbox %d, detaching.\n",
  			     ha->board_name, i);
  			goto release;
  		}
  	}
  
  	if (!(ha->sp_cpu_addr = pci_alloc_consistent(ha->pdev,
  							sizeof(struct mssp),
  							&ha->sp_dma_addr))) {
  		printk("%s: pci_alloc_consistent failed, detaching.\n", ha->board_name);
  		goto release;
  	}
  
  	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 (tag_mode != TAG_DISABLED && tag_mode != TAG_SIMPLE)
  		tag_mode = TAG_ORDERED;
  
  	if (j == 0) {
  		printk
  		    ("EATA/DMA 2.0x: Copyright (C) 1994-2003 Dario Ballabio.\n");
  		printk
  		    ("%s config options -> tm:%d, lc:%c, mq:%d, rs:%c, et:%c, "
  		     "ip:%c, ep:%c, pp:%c.\n", driver_name, tag_mode,
  		     YESNO(linked_comm), max_queue_depth, YESNO(rev_scan),
  		     YESNO(ext_tran), YESNO(isa_probe), YESNO(eisa_probe),
  		     YESNO(pci_probe));
  	}
  
  	printk("%s: 2.0%c, %s 0x%03lx, IRQ %u, %s, SG %d, MB %d.\n",
  	       ha->board_name, ha->protocol_rev, bus_type,
  	       (unsigned long)shost->io_port, shost->irq, dma_name,
  	       shost->sg_tablesize, shost->can_queue);
  
  	if (shost->max_id > 8 || shost->max_lun > 8)
  		printk
  		    ("%s: wide SCSI support enabled, max_id %u, max_lun %u.\n",
  		     ha->board_name, shost->max_id, shost->max_lun);
  
  	for (i = 0; i <= shost->max_channel; i++)
  		printk("%s: SCSI channel %u enabled, host target ID %d.\n",
  		       ha->board_name, 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 %d, cpl %d spl %d.\n", name, info.version,
  	       info.ocsena, info.tarsup, info.trnxfr, info.morsup, info.sync,
  	       info.second, info.data_len, info.cp_len, 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
  
  	if (ha->pdev) {
  		pci_set_master(ha->pdev);
  		if (pci_set_dma_mask(ha->pdev, DMA_BIT_MASK(32)))
  			printk("%s: warning, pci_set_dma_mask failed.\n",
  			       ha->board_name);
  	}
  
  	return 1;
  
        freedma:
  	if (subversion == ISA)
  		free_dma(dma_channel);
        freeirq:
  	free_irq(irq, &sha[j]);
        freelock:
  	spin_unlock_irq(&driver_lock);
  	release_region(port_base, REGION_SIZE);
        fail:
  	return 0;
  
        release:
  	eata2x_release(shost);
  	return 0;
  }
  
  static void internal_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 = 1;
  	}
  
  	while (cur && (pc = strchr(cur, ':'))) {
  		int val = 0, c = *++pc;
  
  		if (c == 'n' || c == 'N')
  			val = 0;
  		else if (c == 'y' || c == 'Y')
  			val = 1;
  		else
  			val = (int)simple_strtoul(pc, NULL, 0);
  
  		if (!strncmp(cur, "lc:", 3))
  			linked_comm = val;
  		else if (!strncmp(cur, "tm:", 3))
  			tag_mode = val;
  		else if (!strncmp(cur, "tc:", 3))
  			tag_mode = val;
  		else if (!strncmp(cur, "mq:", 3))
  			max_queue_depth = val;
  		else if (!strncmp(cur, "ls:", 3))
  			link_statistics = val;
  		else if (!strncmp(cur, "et:", 3))
  			ext_tran = val;
  		else if (!strncmp(cur, "rs:", 3))
  			rev_scan = val;
  		else if (!strncmp(cur, "ip:", 3))
  			isa_probe = val;
  		else if (!strncmp(cur, "ep:", 3))
  			eisa_probe = val;
  		else if (!strncmp(cur, "pp:", 3))
  			pci_probe = val;
  
  		if ((cur = strchr(cur, ',')))
  			++cur;
  	}
  
  	return;
  }
  
  static int option_setup(char *str)
  {
  	int ints[MAX_INT_PARAM];
  	char *cur = str;
  	int i = 1;
  
  	while (cur && isdigit(*cur) && i < MAX_INT_PARAM) {
  		ints[i++] = simple_strtoul(cur, NULL, 0);
  
  		if ((cur = strchr(cur, ',')) != NULL)
  			cur++;
  	}
  
  	ints[0] = i - 1;
  	internal_setup(cur, ints);
  	return 1;
  }
  
  static void add_pci_ports(void)
  {
  #if defined(CONFIG_PCI)
  	unsigned int addr, k;
  	struct pci_dev *dev = NULL;
  
  	for (k = 0; k < MAX_PCI; k++) {
  
  		if (!(dev = pci_get_class(PCI_CLASS_STORAGE_SCSI << 8, dev)))
  			break;
  
  		if (pci_enable_device(dev)) {
  #if defined(DEBUG_PCI_DETECT)
  			printk
  			    ("%s: detect, bus %d, devfn 0x%x, pci_enable_device failed.\n",
  			     driver_name, dev->bus->number, dev->devfn);
  #endif
  
  			continue;
  		}
  
  		addr = pci_resource_start(dev, 0);
  
  #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
  
  		/* Order addresses according to rev_scan value */
  		io_port[MAX_INT_PARAM + (rev_scan ? (MAX_PCI - k) : (1 + k))] =
  		    addr + PCI_BASE_ADDRESS_0;
  	}
  
  	pci_dev_put(dev);
  #endif				/* end CONFIG_PCI */
  }
  
  static int eata2x_detect(struct scsi_host_template *tpnt)
  {
  	unsigned int j = 0, k;
  
  	tpnt->proc_name = "eata2x";
  
  	if (strlen(boot_options))
  		option_setup(boot_options);
  
  #if defined(MODULE)
  	/* io_port could have been modified when loading as a module */
  	if (io_port[0] != SKIP) {
  		setup_done = 1;
  		io_port[MAX_INT_PARAM] = 0;
  	}
  #endif
  
  	for (k = MAX_INT_PARAM; io_port[k]; k++)
  		if (io_port[k] == SKIP)
  			continue;
  		else if (io_port[k] <= MAX_ISA_ADDR) {
  			if (!isa_probe)
  				io_port[k] = SKIP;
  		} else if (io_port[k] >= MIN_EISA_ADDR
  			   && io_port[k] <= MAX_EISA_ADDR) {
  			if (!eisa_probe)
  				io_port[k] = SKIP;
  		}
  
  	if (pci_probe) {
  		if (!setup_done)
  			add_pci_ports();
  		else
  			enable_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++;
  	}
  
  	num_boards = j;
  	return j;
  }
  
  static void map_dma(unsigned int i, struct hostdata *ha)
  {
  	unsigned int k, pci_dir;
  	int count;
  	struct scatterlist *sg;
  	struct mscp *cpp;
  	struct scsi_cmnd *SCpnt;
  
  	cpp = &ha->cp[i];
  	SCpnt = cpp->SCpnt;
  	pci_dir = SCpnt->sc_data_direction;
  
  	if (SCpnt->sense_buffer)
  		cpp->sense_addr =
  		    H2DEV(pci_map_single(ha->pdev, SCpnt->sense_buffer,
  			   SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE));
  
  	cpp->sense_len = SCSI_SENSE_BUFFERSIZE;
  
  	if (!scsi_sg_count(SCpnt)) {
  		cpp->data_len = 0;
  		return;
  	}
  
  	count = pci_map_sg(ha->pdev, scsi_sglist(SCpnt), scsi_sg_count(SCpnt),
  			   pci_dir);
  	BUG_ON(!count);
  
  	scsi_for_each_sg(SCpnt, sg, count, k) {
  		cpp->sglist[k].address = H2DEV(sg_dma_address(sg));
  		cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(sg));
  	}
  
  	cpp->sg = 1;
  	cpp->data_address = H2DEV(pci_map_single(ha->pdev, cpp->sglist,
  						 scsi_sg_count(SCpnt) *
  						 sizeof(struct sg_list),
  						 pci_dir));
  	cpp->data_len = H2DEV((scsi_sg_count(SCpnt) * sizeof(struct sg_list)));
  }
  
  static void unmap_dma(unsigned int i, struct hostdata *ha)
  {
  	unsigned int pci_dir;
  	struct mscp *cpp;
  	struct scsi_cmnd *SCpnt;
  
  	cpp = &ha->cp[i];
  	SCpnt = cpp->SCpnt;
  	pci_dir = SCpnt->sc_data_direction;
  
  	if (DEV2H(cpp->sense_addr))
  		pci_unmap_single(ha->pdev, DEV2H(cpp->sense_addr),
  				 DEV2H(cpp->sense_len), PCI_DMA_FROMDEVICE);
  
  	if (scsi_sg_count(SCpnt))
  		pci_unmap_sg(ha->pdev, scsi_sglist(SCpnt), scsi_sg_count(SCpnt),
  			     pci_dir);
  
  	if (!DEV2H(cpp->data_len))
  		pci_dir = PCI_DMA_BIDIRECTIONAL;
  
  	if (DEV2H(cpp->data_address))
  		pci_unmap_single(ha->pdev, DEV2H(cpp->data_address),
  				 DEV2H(cpp->data_len), pci_dir);
  }
  
  static void sync_dma(unsigned int i, struct hostdata *ha)
  {
  	unsigned int pci_dir;
  	struct mscp *cpp;
  	struct scsi_cmnd *SCpnt;
  
  	cpp = &ha->cp[i];
  	SCpnt = cpp->SCpnt;
  	pci_dir = SCpnt->sc_data_direction;
  
  	if (DEV2H(cpp->sense_addr))
  		pci_dma_sync_single_for_cpu(ha->pdev, DEV2H(cpp->sense_addr),
  					    DEV2H(cpp->sense_len),
  					    PCI_DMA_FROMDEVICE);
  
  	if (scsi_sg_count(SCpnt))
  		pci_dma_sync_sg_for_cpu(ha->pdev, scsi_sglist(SCpnt),
  					scsi_sg_count(SCpnt), pci_dir);
  
  	if (!DEV2H(cpp->data_len))
  		pci_dir = PCI_DMA_BIDIRECTIONAL;
  
  	if (DEV2H(cpp->data_address))
  		pci_dma_sync_single_for_cpu(ha->pdev,
  					    DEV2H(cpp->data_address),
  					    DEV2H(cpp->data_len), pci_dir);
  }
  
  static void scsi_to_dev_dir(unsigned int i, struct hostdata *ha)
  {
  	unsigned int k;
  
  	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, 0x5d
  	};
  
  	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, 0x00
  	};
  
  	struct mscp *cpp;
  	struct scsi_cmnd *SCpnt;
  
  	cpp = &ha->cp[i];
  	SCpnt = cpp->SCpnt;
  
  	if (SCpnt->sc_data_direction == DMA_FROM_DEVICE) {
  		cpp->din = 1;
  		cpp->dout = 0;
  		return;
  	} else if (SCpnt->sc_data_direction == DMA_TO_DEVICE) {
  		cpp->din = 0;
  		cpp->dout = 1;
  		return;
  	} else if (SCpnt->sc_data_direction == DMA_NONE) {
  		cpp->din = 0;
  		cpp->dout = 0;
  		return;
  	}
  
  	if (SCpnt->sc_data_direction != DMA_BIDIRECTIONAL)
  		panic("%s: qcomm, invalid SCpnt->sc_data_direction.\n",
  				ha->board_name);
  
  	for (k = 0; k < ARRAY_SIZE(data_out_cmds); k++)
  		if (SCpnt->cmnd[0] == data_out_cmds[k]) {
  			cpp->dout = 1;
  			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 = 0;
  				break;
  			}
  
  }
  
  static int eata2x_queuecommand(struct scsi_cmnd *SCpnt,
  			       void (*done) (struct scsi_cmnd *))
  {
  	struct Scsi_Host *shost = SCpnt->device->host;
  	struct hostdata *ha = (struct hostdata *)shost->hostdata;
  	unsigned int i, k;
  	struct mscp *cpp;
  
  	if (SCpnt->host_scribble)
  		panic("%s: qcomm, pid %ld, SCpnt %p already active.\n",
  		      ha->board_name, SCpnt->serial_number, SCpnt);
  
  	/* i is the mailbox number, look for the first free mailbox
  	   starting from last_cp_used */
  	i = ha->last_cp_used + 1;
  
  	for (k = 0; k < shost->can_queue; k++, i++) {
  		if (i >= shost->can_queue)
  			i = 0;
  		if (ha->cp_stat[i] == FREE) {
  			ha->last_cp_used = i;
  			break;
  		}
  	}
  
  	if (k == shost->can_queue) {
  		printk("%s: qcomm, no free mailbox.\n", ha->board_name);
  		return 1;
  	}
  
  	/* Set pointer to control packet structure */
  	cpp = &ha->cp[i];
  
  	memset(cpp, 0, sizeof(struct mscp) - CP_TAIL_SIZE);
  
  	/* Set pointer to status packet structure, Big Endian format */
  	cpp->sp_dma_addr = H2DEV(ha->sp_dma_addr);
  
  	SCpnt->scsi_done = done;
  	cpp->cpp_index = i;
  	SCpnt->host_scribble = (unsigned char *)&cpp->cpp_index;
  
  	if (do_trace)
  		scmd_printk(KERN_INFO, SCpnt,
  			"qcomm, mbox %d, pid %ld.\n", i, SCpnt->serial_number);
  
  	cpp->reqsen = 1;
  	cpp->dispri = 1;
  #if 0
  	if (SCpnt->device->type == TYPE_TAPE)
  		cpp->hbaci = 1;
  #endif
  	cpp->one = 1;
  	cpp->channel = SCpnt->device->channel;
  	cpp->target = SCpnt->device->id;
  	cpp->lun = SCpnt->device->lun;
  	cpp->SCpnt = SCpnt;
  	memcpy(cpp->cdb, SCpnt->cmnd, SCpnt->cmd_len);
  
  	/* Use data transfer direction SCpnt->sc_data_direction */
  	scsi_to_dev_dir(i, ha);
  
  	/* Map DMA buffers and SG list */
  	map_dma(i, ha);
  
  	if (linked_comm && SCpnt->device->queue_depth > 2
  	    && TLDEV(SCpnt->device->type)) {
  		ha->cp_stat[i] = READY;
  		flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), ha, 0);
  		return 0;
  	}
  
  	/* Send control packet to the board */
  	if (do_dma(shost->io_port, cpp->cp_dma_addr, SEND_CP_DMA)) {
  		unmap_dma(i, ha);
  		SCpnt->host_scribble = NULL;
  		scmd_printk(KERN_INFO, SCpnt,
  			"qcomm, pid %ld, adapter busy.\n", SCpnt->serial_number);
  		return 1;
  	}
  
  	ha->cp_stat[i] = IN_USE;
  	return 0;
  }
  
  static int eata2x_eh_abort(struct scsi_cmnd *SCarg)
  {
  	struct Scsi_Host *shost = SCarg->device->host;
  	struct hostdata *ha = (struct hostdata *)shost->hostdata;
  	unsigned int i;
  
  	if (SCarg->host_scribble == NULL) {
  		scmd_printk(KERN_INFO, SCarg,
  			"abort, pid %ld inactive.\n", SCarg->serial_number);
  		return SUCCESS;
  	}
  
  	i = *(unsigned int *)SCarg->host_scribble;
  	scmd_printk(KERN_WARNING, SCarg,
  		"abort, mbox %d, pid %ld.\n", i, SCarg->serial_number);
  
  	if (i >= shost->can_queue)
  		panic("%s: abort, invalid SCarg->host_scribble.\n", ha->board_name);
  
  	if (wait_on_busy(shost->io_port, MAXLOOP)) {
  		printk("%s: abort, timeout error.\n", ha->board_name);
  		return FAILED;
  	}
  
  	if (ha->cp_stat[i] == FREE) {
  		printk("%s: abort, mbox %d is free.\n", ha->board_name, i);
  		return SUCCESS;
  	}
  
  	if (ha->cp_stat[i] == IN_USE) {
  		printk("%s: abort, mbox %d is in use.\n", ha->board_name, i);
  
  		if (SCarg != ha->cp[i].SCpnt)
  			panic("%s: abort, mbox %d, SCarg %p, cp SCpnt %p.\n",
  			      ha->board_name, i, SCarg, ha->cp[i].SCpnt);
  
  		if (inb(shost->io_port + REG_AUX_STATUS) & IRQ_ASSERTED)
  			printk("%s: abort, mbox %d, interrupt pending.\n",
  			       ha->board_name, i);
  
  		return FAILED;
  	}
  
  	if (ha->cp_stat[i] == IN_RESET) {
  		printk("%s: abort, mbox %d is in reset.\n", ha->board_name, i);
  		return FAILED;
  	}
  
  	if (ha->cp_stat[i] == LOCKED) {
  		printk("%s: abort, mbox %d is locked.\n", ha->board_name, i);
  		return SUCCESS;
  	}
  
  	if (ha->cp_stat[i] == READY || ha->cp_stat[i] == ABORTING) {
  		unmap_dma(i, ha);
  		SCarg->result = DID_ABORT << 16;
  		SCarg->host_scribble = NULL;
  		ha->cp_stat[i] = FREE;
  		printk("%s, abort, mbox %d ready, DID_ABORT, pid %ld done.\n",
  		       ha->board_name, i, SCarg->serial_number);
  		SCarg->scsi_done(SCarg);
  		return SUCCESS;
  	}
  
  	panic("%s: abort, mbox %d, invalid cp_stat.\n", ha->board_name, i);
  }
  
  static int eata2x_eh_host_reset(struct scsi_cmnd *SCarg)
  {
  	unsigned int i, time, k, c, limit = 0;
  	int arg_done = 0;
  	struct scsi_cmnd *SCpnt;
  	struct Scsi_Host *shost = SCarg->device->host;
  	struct hostdata *ha = (struct hostdata *)shost->hostdata;
  
  	scmd_printk(KERN_INFO, SCarg,
  		"reset, enter, pid %ld.\n", SCarg->serial_number);
  
  	spin_lock_irq(shost->host_lock);
  
  	if (SCarg->host_scribble == NULL)
  		printk("%s: reset, pid %ld inactive.\n", ha->board_name, SCarg->serial_number);
  
  	if (ha->in_reset) {
  		printk("%s: reset, exit, already in reset.\n", ha->board_name);
  		spin_unlock_irq(shost->host_lock);
  		return FAILED;
  	}
  
  	if (wait_on_busy(shost->io_port, MAXLOOP)) {
  		printk("%s: reset, exit, timeout error.\n", ha->board_name);
  		spin_unlock_irq(shost->host_lock);
  		return FAILED;
  	}
  
  	ha->retries = 0;
  
  	for (c = 0; c <= shost->max_channel; c++)
  		for (k = 0; k < shost->max_id; k++) {
  			ha->target_redo[k][c] = 1;
  			ha->target_to[k][c] = 0;
  		}
  
  	for (i = 0; i < shost->can_queue; i++) {
  
  		if (ha->cp_stat[i] == FREE)
  			continue;
  
  		if (ha->cp_stat[i] == LOCKED) {
  			ha->cp_stat[i] = FREE;
  			printk("%s: reset, locked mbox %d forced free.\n",
  			       ha->board_name, i);
  			continue;
  		}
  
  		if (!(SCpnt = ha->cp[i].SCpnt))
  			panic("%s: reset, mbox %d, SCpnt == NULL.\n", ha->board_name, i);
  
  		if (ha->cp_stat[i] == READY || ha->cp_stat[i] == ABORTING) {
  			ha->cp_stat[i] = ABORTING;
  			printk("%s: reset, mbox %d aborting, pid %ld.\n",
  			       ha->board_name, i, SCpnt->serial_number);
  		}
  
  		else {
  			ha->cp_stat[i] = IN_RESET;
  			printk("%s: reset, mbox %d in reset, pid %ld.\n",
  			       ha->board_name, i, SCpnt->serial_number);
  		}
  
  		if (SCpnt->host_scribble == NULL)
  			panic("%s: reset, mbox %d, garbled SCpnt.\n", ha->board_name, i);
  
  		if (*(unsigned int *)SCpnt->host_scribble != i)
  			panic("%s: reset, mbox %d, index mismatch.\n", ha->board_name, i);
  
  		if (SCpnt->scsi_done == NULL)
  			panic("%s: reset, mbox %d, SCpnt->scsi_done == NULL.\n",
  			      ha->board_name, i);
  
  		if (SCpnt == SCarg)
  			arg_done = 1;
  	}
  
  	if (do_dma(shost->io_port, 0, RESET_PIO)) {
  		printk("%s: reset, cannot reset, timeout error.\n", ha->board_name);
  		spin_unlock_irq(shost->host_lock);
  		return FAILED;
  	}
  
  	printk("%s: reset, board reset done, enabling interrupts.\n", ha->board_name);
  
  #if defined(DEBUG_RESET)
  	do_trace = 1;
  #endif
  
  	ha->in_reset = 1;
  
  	spin_unlock_irq(shost->host_lock);
  
  	/* FIXME: use a sleep instead */
  	time = jiffies;
  	while ((jiffies - time) < (10 * HZ) && limit++ < 200000)
  		udelay(100L);
  
  	spin_lock_irq(shost->host_lock);
  
  	printk("%s: reset, interrupts disabled, loops %d.\n", ha->board_name, limit);
  
  	for (i = 0; i < shost->can_queue; i++) {
  
  		if (ha->cp_stat[i] == IN_RESET) {
  			SCpnt = ha->cp[i].SCpnt;
  			unmap_dma(i, ha);
  			SCpnt->result = DID_RESET << 16;
  			SCpnt->host_scribble = NULL;
  
  			/* This mailbox is still waiting for its interrupt */
  			ha->cp_stat[i] = LOCKED;
  
  			printk
  			    ("%s, reset, mbox %d locked, DID_RESET, pid %ld done.\n",
  			     ha->board_name, i, SCpnt->serial_number);
  		}
  
  		else if (ha->cp_stat[i] == ABORTING) {
  			SCpnt = ha->cp[i].SCpnt;
  			unmap_dma(i, ha);
  			SCpnt->result = DID_RESET << 16;
  			SCpnt->host_scribble = NULL;
  
  			/* This mailbox was never queued to the adapter */
  			ha->cp_stat[i] = FREE;
  
  			printk
  			    ("%s, reset, mbox %d aborting, DID_RESET, pid %ld done.\n",
  			     ha->board_name, i, SCpnt->serial_number);
  		}
  
  		else
  			/* Any other mailbox has already been set free by interrupt */
  			continue;
  
  		SCpnt->scsi_done(SCpnt);
  	}
  
  	ha->in_reset = 0;
  	do_trace = 0;
  
  	if (arg_done)
  		printk("%s: reset, exit, pid %ld done.\n", ha->board_name, SCarg->serial_number);
  	else
  		printk("%s: reset, exit.\n", ha->board_name);
  
  	spin_unlock_irq(shost->host_lock);
  	return SUCCESS;
  }
  
  int eata2x_bios_param(struct scsi_device *sdev, struct block_device *bdev,
  		      sector_t capacity, int *dkinfo)
  {
  	unsigned int size = capacity;
  
  	if (ext_tran || (scsicam_bios_param(bdev, capacity, dkinfo) < 0)) {
  		dkinfo[0] = 255;
  		dkinfo[1] = 63;
  		dkinfo[2] = size / (dkinfo[0] * dkinfo[1]);
  	}
  #if defined (DEBUG_GEOMETRY)
  	printk("%s: bios_param, head=%d, sec=%d, cyl=%d.\n", driver_name,
  	       dkinfo[0], dkinfo[1], dkinfo[2]);
  #endif
  
  	return 0;
  }
  
  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 int reorder(struct hostdata *ha, unsigned long cursec,
  		   unsigned int ihdlr, unsigned int il[], unsigned int n_ready)
  {
  	struct scsi_cmnd *SCpnt;
  	struct mscp *cpp;
  	unsigned int k, n;
  	unsigned int rev = 0, s = 1, r = 1;
  	unsigned int input_only = 1, overlap = 0;
  	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 0;
  
  	for (n = 0; n < n_ready; n++) {
  		k = il[n];
  		cpp = &ha->cp[k];
  		SCpnt = cpp->SCpnt;
  
  		if (!cpp->din)
  			input_only = 0;
  
  		if (blk_rq_pos(SCpnt->request) < minsec)
  			minsec = blk_rq_pos(SCpnt->request);
  		if (blk_rq_pos(SCpnt->request) > maxsec)
  			maxsec = blk_rq_pos(SCpnt->request);
  
  		sl[n] = blk_rq_pos(SCpnt->request);
  		ioseek += blk_rq_sectors(SCpnt->request);
  
  		if (!n)
  			continue;
  
  		if (sl[n] < sl[n - 1])
  			s = 0;
  		if (sl[n] > sl[n - 1])
  			r = 0;
  
  		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 = 1;
  
  	if (ioseek > ((maxsec - minsec) / 2))
  		rev = 0;
  
  	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 = &ha->cp[k];
  			SCpnt = cpp->SCpnt;
  			ll[n] = blk_rq_sectors(SCpnt->request);
  			pl[n] = SCpnt->serial_number;
  
  			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 = 1;
  		}
  
  	if (overlap)
  		sort(pl, il, n_ready, 0);
  
  	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 = &ha->cp[k];
  			SCpnt = cpp->SCpnt;
  			scmd_printk(KERN_INFO, SCpnt,
  			    "%s pid %ld mb %d fc %d nr %d sec %ld ns %u"
  			     " cur %ld s:%c r:%c rev:%c in:%c ov:%c xd %d.\n",
  			     (ihdlr ? "ihdlr" : "qcomm"),
  			     SCpnt->serial_number, k, flushcount,
  			     n_ready, blk_rq_pos(SCpnt->request),
  			     blk_rq_sectors(SCpnt->request), cursec, YESNO(s),
  			     YESNO(r), YESNO(rev), YESNO(input_only),
  			     YESNO(overlap), cpp->din);
  		}
  #endif
  	return overlap;
  }
  
  static void flush_dev(struct scsi_device *dev, unsigned long cursec,
  		      struct hostdata *ha, unsigned int ihdlr)
  {
  	struct scsi_cmnd *SCpnt;
  	struct mscp *cpp;
  	unsigned int k, n, n_ready = 0, il[MAX_MAILBOXES];
  
  	for (k = 0; k < dev->host->can_queue; k++) {
  
  		if (ha->cp_stat[k] != READY && ha->cp_stat[k] != IN_USE)
  			continue;
  
  		cpp = &ha->cp[k];
  		SCpnt = cpp->SCpnt;
  
  		if (SCpnt->device != dev)
  			continue;
  
  		if (ha->cp_stat[k] == IN_USE)
  			return;
  
  		il[n_ready++] = k;
  	}
  
  	if (reorder(ha, cursec, ihdlr, il, n_ready))
  		n_ready = 1;
  
  	for (n = 0; n < n_ready; n++) {
  		k = il[n];
  		cpp = &ha->cp[k];
  		SCpnt = cpp->SCpnt;
  
  		if (do_dma(dev->host->io_port, cpp->cp_dma_addr, SEND_CP_DMA)) {
  			scmd_printk(KERN_INFO, SCpnt,
  			    "%s, pid %ld, mbox %d, adapter"
  			     " busy, will abort.\n",
  			     (ihdlr ? "ihdlr" : "qcomm"),
  			     SCpnt->serial_number, k);
  			ha->cp_stat[k] = ABORTING;
  			continue;
  		}
  
  		ha->cp_stat[k] = IN_USE;
  	}
  }
  
  static irqreturn_t ihdlr(struct Scsi_Host *shost)
  {
  	struct scsi_cmnd *SCpnt;
  	unsigned int i, k, c, status, tstatus, reg;
  	struct mssp *spp;
  	struct mscp *cpp;
  	struct hostdata *ha = (struct hostdata *)shost->hostdata;
  	int irq = shost->irq;
  
  	/* Check if this board need to be serviced */
  	if (!(inb(shost->io_port + REG_AUX_STATUS) & IRQ_ASSERTED))
  		goto none;
  
  	ha->iocount++;
  
  	if (do_trace)
  		printk("%s: ihdlr, enter, irq %d, count %d.\n", ha->board_name, irq,
  		       ha->iocount);
  
  	/* Check if this board is still busy */
  	if (wait_on_busy(shost->io_port, 20 * MAXLOOP)) {
  		reg = inb(shost->io_port + REG_STATUS);
  		printk
  		    ("%s: ihdlr, busy timeout error,  irq %d, reg 0x%x, count %d.\n",
  		     ha->board_name, irq, reg, ha->iocount);
  		goto none;
  	}
  
  	spp = &ha->sp;
  
  	/* Make a local copy just before clearing the interrupt indication */
  	memcpy(spp, ha->sp_cpu_addr, sizeof(struct mssp));
  
  	/* Clear the completion flag and cp pointer on the dynamic copy of sp */
  	memset(ha->sp_cpu_addr, 0, sizeof(struct mssp));
  
  	/* Read the status register to clear the interrupt indication */
  	reg = inb(shost->io_port + REG_STATUS);
  
  #if defined (DEBUG_INTERRUPT)
  	{
  		unsigned char *bytesp;
  		int cnt;
  		bytesp = (unsigned char *)spp;
  		if (ha->iocount < 200) {
  			printk("sp[] =");
  			for (cnt = 0; cnt < 15; cnt++)
  				printk(" 0x%x", bytesp[cnt]);
  			printk("\n");
  		}
  	}
  #endif
  
  	/* Reject any sp with supspect data */
  	if (spp->eoc == 0 && ha->iocount > 1)
  		printk
  		    ("%s: ihdlr, spp->eoc == 0, irq %d, reg 0x%x, count %d.\n",
  		     ha->board_name, irq, reg, ha->iocount);
  	if (spp->cpp_index < 0 || spp->cpp_index >= shost->can_queue)
  		printk
  		    ("%s: ihdlr, bad spp->cpp_index %d, irq %d, reg 0x%x, count %d.\n",
  		     ha->board_name, spp->cpp_index, irq, reg, ha->iocount);
  	if (spp->eoc == 0 || spp->cpp_index < 0
  	    || spp->cpp_index >= shost->can_queue)
  		goto handled;
  
  	/* Find the mailbox to be serviced on this board */
  	i = spp->cpp_index;
  
  	cpp = &(ha->cp[i]);
  
  #if defined(DEBUG_GENERATE_ABORTS)
  	if ((ha->iocount > 500) && ((ha->iocount % 500) < 3))
  		goto handled;
  #endif
  
  	if (ha->cp_stat[i] == IGNORE) {
  		ha->cp_stat[i] = FREE;
  		goto handled;
  	} else if (ha->cp_stat[i] == LOCKED) {
  		ha->cp_stat[i] = FREE;
  		printk("%s: ihdlr, mbox %d unlocked, count %d.\n", ha->board_name, i,
  		       ha->iocount);
  		goto handled;
  	} else if (ha->cp_stat[i] == FREE) {
  		printk("%s: ihdlr, mbox %d is free, count %d.\n", ha->board_name, i,
  		       ha->iocount);
  		goto handled;
  	} else if (ha->cp_stat[i] == IN_RESET)
  		printk("%s: ihdlr, mbox %d is in reset.\n", ha->board_name, i);
  	else if (ha->cp_stat[i] != IN_USE)
  		panic("%s: ihdlr, mbox %d, invalid cp_stat: %d.\n",
  		      ha->board_name, i, ha->cp_stat[i]);
  
  	ha->cp_stat[i] = FREE;
  	SCpnt = cpp->SCpnt;
  
  	if (SCpnt == NULL)
  		panic("%s: ihdlr, mbox %d, SCpnt == NULL.\n", ha->board_name, i);
  
  	if (SCpnt->host_scribble == NULL)
  		panic("%s: ihdlr, mbox %d, pid %ld, SCpnt %p garbled.\n", ha->board_name,
  		      i, SCpnt->serial_number, SCpnt);
  
  	if (*(unsigned int *)SCpnt->host_scribble != i)
  		panic("%s: ihdlr, mbox %d, pid %ld, index mismatch %d.\n",
  		      ha->board_name, i, SCpnt->serial_number,
  		      *(unsigned int *)SCpnt->host_scribble);
  
  	sync_dma(i, ha);
  
  	if (linked_comm && SCpnt->device->queue_depth > 2
  	    && TLDEV(SCpnt->device->type))
  		flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), ha, 1);
  
  	tstatus = status_byte(spp->target_status);
  
  #if defined(DEBUG_GENERATE_ERRORS)
  	if ((ha->iocount > 500) && ((ha->iocount % 200) < 2))
  		spp->adapter_status = 0x01;
  #endif
  
  	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
  			 && ha->target_redo[SCpnt->device->id][SCpnt->
  								  device->
  								  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)
  			ha->target_redo[SCpnt->device->id][SCpnt->device->
  							      channel] = 0;
  
  		if (spp->target_status && SCpnt->device->type == TYPE_DISK &&
  		    (!(tstatus == CHECK_CONDITION && ha->iocount <= 1000 &&
  		       (SCpnt->sense_buffer[2] & 0xf) == NOT_READY)))
  			printk("%s: ihdlr, target %d.%d:%d, pid %ld, "
  			       "target_status 0x%x, sense key 0x%x.\n",
  			       ha->board_name,
  			       SCpnt->device->channel, SCpnt->device->id,
  			       SCpnt->device->lun, SCpnt->serial_number,
  			       spp->target_status, SCpnt->sense_buffer[2]);
  
  		ha->target_to[SCpnt->device->id][SCpnt->device->channel] = 0;
  
  		if (ha->last_retried_pid == SCpnt->serial_number)
  			ha->retries = 0;
  
  		break;
  	case ASST:		/* Selection Time Out */
  	case 0x02:		/* Command Time Out   */
  
  		if (ha->target_to[SCpnt->device->id][SCpnt->device->channel] > 1)
  			status = DID_ERROR << 16;
  		else {
  			status = DID_TIME_OUT << 16;
  			ha->target_to[SCpnt->device->id][SCpnt->device->
  							    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 <= shost->max_channel; c++)
  			for (k = 0; k < shost->max_id; k++)
  				ha->target_redo[k][c] = 1;
  
  		if (SCpnt->device->type != TYPE_TAPE
  		    && ha->retries < MAX_INTERNAL_RETRIES) {
  
  #if defined(DID_SOFT_ERROR)
  			status = DID_SOFT_ERROR << 16;
  #else
  			status = DID_BUS_BUSY << 16;
  #endif
  
  			ha->retries++;
  			ha->last_retried_pid = SCpnt->serial_number;
  		} 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 && ha->iocount > 1000) ||
  	    (spp->adapter_status != ASOK &&
  	     spp->adapter_status != ASST && ha->iocount <= 1000) ||
  	    do_trace || msg_byte(spp->target_status))
  #endif
  		scmd_printk(KERN_INFO, SCpnt, "ihdlr, mbox %2d, err 0x%x:%x,"
  		       " pid %ld, reg 0x%x, count %d.\n",
  		       i, spp->adapter_status, spp->target_status,
  		       SCpnt->serial_number, reg, ha->iocount);
  
  	unmap_dma(i, ha);
  
  	/* 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", ha->board_name,
  				irq, ha->iocount);
  
        handled:
  	return IRQ_HANDLED;
        none:
  	return IRQ_NONE;
  }
  
  static irqreturn_t do_interrupt_handler(int dummy, void *shap)
  {
  	struct Scsi_Host *shost;
  	unsigned int j;
  	unsigned long spin_flags;
  	irqreturn_t ret;
  
  	/* Check if the interrupt must be processed by this handler */
  	if ((j = (unsigned int)((char *)shap - sha)) >= num_boards)
  		return IRQ_NONE;
  	shost = sh[j];
  
  	spin_lock_irqsave(shost->host_lock, spin_flags);
  	ret = ihdlr(shost);
  	spin_unlock_irqrestore(shost->host_lock, spin_flags);
  	return ret;
  }
  
  static int eata2x_release(struct Scsi_Host *shost)
  {
  	struct hostdata *ha = (struct hostdata *)shost->hostdata;
  	unsigned int i;
  
  	for (i = 0; i < shost->can_queue; i++)
  		kfree((&ha->cp[i])->sglist);
  
  	for (i = 0; i < shost->can_queue; i++)
  		pci_unmap_single(ha->pdev, ha->cp[i].cp_dma_addr,
  				 sizeof(struct mscp), PCI_DMA_BIDIRECTIONAL);
  
  	if (ha->sp_cpu_addr)
  		pci_free_consistent(ha->pdev, sizeof(struct mssp),
  				    ha->sp_cpu_addr, ha->sp_dma_addr);
  
  	free_irq(shost->irq, &sha[ha->board_number]);
  
  	if (shost->dma_channel != NO_DMA)
  		free_dma(shost->dma_channel);
  
  	release_region(shost->io_port, shost->n_io_port);
  	scsi_unregister(shost);
  	return 0;
  }
  
  #include "scsi_module.c"
  
  #ifndef MODULE
  __setup("eata=", option_setup);
  #endif				/* end MODULE */
  