/*

  Linux Driver for Mylex DAC960/AcceleRAID/eXtremeRAID PCI RAID Controllers

  Copyright 1998-2001 by Leonard N. Zubkoff <lnz@dandelion.com>
  Portions Copyright 2002 by Mylex (An IBM Business Unit)

  This program is free software; you may redistribute and/or modify it under
  the terms of the GNU General Public License Version 2 as published by the
  Free Software Foundation.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  for complete details.

*/


#define DAC960_DriverVersion                    "2.5.49"
#define DAC960_DriverDate                       "21 Aug 2007"


#include <linux/module.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/genhd.h>
#include <linux/hdreg.h>
#include <linux/blkpg.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/reboot.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include "DAC960.h"

#define DAC960_GAM_MINOR        252


static DAC960_Controller_T *DAC960_Controllers[DAC960_MaxControllers];
static int DAC960_ControllerCount;
static struct proc_dir_entry *DAC960_ProcDirectoryEntry;

static long disk_size(DAC960_Controller_T *p, int drive_nr)
{
        if (p->FirmwareType == DAC960_V1_Controller) {
                if (drive_nr >= p->LogicalDriveCount)
                        return 0;
                return p->V1.LogicalDriveInformation[drive_nr].
                        LogicalDriveSize;
        } else {
                DAC960_V2_LogicalDeviceInfo_T *i =
                        p->V2.LogicalDeviceInformation[drive_nr];
                if (i == NULL)
                        return 0;
                return i->ConfigurableDeviceSize;
        }
}

static int DAC960_open(struct block_device *bdev, fmode_t mode)
{
        struct gendisk *disk = bdev->bd_disk;
        DAC960_Controller_T *p = disk->queue->queuedata;
        int drive_nr = (long)disk->private_data;

        if (p->FirmwareType == DAC960_V1_Controller) {
                if (p->V1.LogicalDriveInformation[drive_nr].
                    LogicalDriveState == DAC960_V1_LogicalDrive_Offline)
                        return -ENXIO;
        } else {
                DAC960_V2_LogicalDeviceInfo_T *i =
                        p->V2.LogicalDeviceInformation[drive_nr];
                if (!i || i->LogicalDeviceState == DAC960_V2_LogicalDevice_Offline)
                        return -ENXIO;
        }

        check_disk_change(bdev);

        if (!get_capacity(p->disks[drive_nr]))
                return -ENXIO;
        return 0;
}

static int DAC960_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
        struct gendisk *disk = bdev->bd_disk;
        DAC960_Controller_T *p = disk->queue->queuedata;
        int drive_nr = (long)disk->private_data;

        if (p->FirmwareType == DAC960_V1_Controller) {
                geo->heads = p->V1.GeometryTranslationHeads;
                geo->sectors = p->V1.GeometryTranslationSectors;
                geo->cylinders = p->V1.LogicalDriveInformation[drive_nr].
                        LogicalDriveSize / (geo->heads * geo->sectors);
        } else {
                DAC960_V2_LogicalDeviceInfo_T *i =
                        p->V2.LogicalDeviceInformation[drive_nr];
                switch (i->DriveGeometry) {
                case DAC960_V2_Geometry_128_32:
                        geo->heads = 128;
                        geo->sectors = 32;
                        break;
                case DAC960_V2_Geometry_255_63:
                        geo->heads = 255;
                        geo->sectors = 63;
                        break;
                default:
                        DAC960_Error("Illegal Logical Device Geometry %d\n",
                                        p, i->DriveGeometry);
                        return -EINVAL;
                }

                geo->cylinders = i->ConfigurableDeviceSize /
                        (geo->heads * geo->sectors);
        }
        
        return 0;
}

static int DAC960_media_changed(struct gendisk *disk)
{
        DAC960_Controller_T *p = disk->queue->queuedata;
        int drive_nr = (long)disk->private_data;

        if (!p->LogicalDriveInitiallyAccessible[drive_nr])
                return 1;
        return 0;
}

static int DAC960_revalidate_disk(struct gendisk *disk)
{
        DAC960_Controller_T *p = disk->queue->queuedata;
        int unit = (long)disk->private_data;

        set_capacity(disk, disk_size(p, unit));
        return 0;
}

static const struct block_device_operations DAC960_BlockDeviceOperations = {
        .owner                  = THIS_MODULE,
        .open                   = DAC960_open,
        .getgeo                 = DAC960_getgeo,
        .media_changed          = DAC960_media_changed,
        .revalidate_disk        = DAC960_revalidate_disk,
};


/*
  DAC960_AnnounceDriver announces the Driver Version and Date, Author's Name,
  Copyright Notice, and Electronic Mail Address.
*/

static void DAC960_AnnounceDriver(DAC960_Controller_T *Controller)
{
  DAC960_Announce("***** DAC960 RAID Driver Version "
                  DAC960_DriverVersion " of "
                  DAC960_DriverDate " *****\n", Controller);
  DAC960_Announce("Copyright 1998-2001 by Leonard N. Zubkoff "
                  "<lnz@dandelion.com>\n", Controller);
}


/*
  DAC960_Failure prints a standardized error message, and then returns false.
*/

static bool DAC960_Failure(DAC960_Controller_T *Controller,
                              unsigned char *ErrorMessage)
{
  DAC960_Error("While configuring DAC960 PCI RAID Controller at\n",
               Controller);
  if (Controller->IO_Address == 0)
    DAC960_Error("PCI Bus %d Device %d Function %d I/O Address N/A "
                 "PCI Address 0x%X\n", Controller,
                 Controller->Bus, Controller->Device,
                 Controller->Function, Controller->PCI_Address);
  else DAC960_Error("PCI Bus %d Device %d Function %d I/O Address "
                    "0x%X PCI Address 0x%X\n", Controller,
                    Controller->Bus, Controller->Device,
                    Controller->Function, Controller->IO_Address,
                    Controller->PCI_Address);
  DAC960_Error("%s FAILED - DETACHING\n", Controller, ErrorMessage);
  return false;
}

/*
  init_dma_loaf() and slice_dma_loaf() are helper functions for
  aggregating the dma-mapped memory for a well-known collection of
  data structures that are of different lengths.

  These routines don't guarantee any alignment.  The caller must
  include any space needed for alignment in the sizes of the structures
  that are passed in.
 */

static bool init_dma_loaf(struct pci_dev *dev, struct dma_loaf *loaf,
                                                                 size_t len)
{
        void *cpu_addr;
        dma_addr_t dma_handle;

        cpu_addr = pci_alloc_consistent(dev, len, &dma_handle);
        if (cpu_addr == NULL)
                return false;
        
        loaf->cpu_free = loaf->cpu_base = cpu_addr;
        loaf->dma_free =loaf->dma_base = dma_handle;
        loaf->length = len;
        memset(cpu_addr, 0, len);
        return true;
}

static void *slice_dma_loaf(struct dma_loaf *loaf, size_t len,
                                        dma_addr_t *dma_handle)
{
        void *cpu_end = loaf->cpu_free + len;
        void *cpu_addr = loaf->cpu_free;

        BUG_ON(cpu_end > loaf->cpu_base + loaf->length);
        *dma_handle = loaf->dma_free;
        loaf->cpu_free = cpu_end;
        loaf->dma_free += len;
        return cpu_addr;
}

static void free_dma_loaf(struct pci_dev *dev, struct dma_loaf *loaf_handle)
{
        if (loaf_handle->cpu_base != NULL)
                pci_free_consistent(dev, loaf_handle->length,
                        loaf_handle->cpu_base, loaf_handle->dma_base);
}


/*
  DAC960_CreateAuxiliaryStructures allocates and initializes the auxiliary
  data structures for Controller.  It returns true on success and false on
  failure.
*/

static bool DAC960_CreateAuxiliaryStructures(DAC960_Controller_T *Controller)
{
  int CommandAllocationLength, CommandAllocationGroupSize;
  int CommandsRemaining = 0, CommandIdentifier, CommandGroupByteCount;
  void *AllocationPointer = NULL;
  void *ScatterGatherCPU = NULL;
  dma_addr_t ScatterGatherDMA;
  struct pci_pool *ScatterGatherPool;
  void *RequestSenseCPU = NULL;
  dma_addr_t RequestSenseDMA;
  struct pci_pool *RequestSensePool = NULL;

  if (Controller->FirmwareType == DAC960_V1_Controller)
    {
      CommandAllocationLength = offsetof(DAC960_Command_T, V1.EndMarker);
      CommandAllocationGroupSize = DAC960_V1_CommandAllocationGroupSize;
      ScatterGatherPool = pci_pool_create("DAC960_V1_ScatterGather",
                Controller->PCIDevice,
        DAC960_V1_ScatterGatherLimit * sizeof(DAC960_V1_ScatterGatherSegment_T),
        sizeof(DAC960_V1_ScatterGatherSegment_T), 0);
      if (ScatterGatherPool == NULL)
            return DAC960_Failure(Controller,
                        "AUXILIARY STRUCTURE CREATION (SG)");
      Controller->ScatterGatherPool = ScatterGatherPool;
    }
  else
    {
      CommandAllocationLength = offsetof(DAC960_Command_T, V2.EndMarker);
      CommandAllocationGroupSize = DAC960_V2_CommandAllocationGroupSize;
      ScatterGatherPool = pci_pool_create("DAC960_V2_ScatterGather",
                Controller->PCIDevice,
        DAC960_V2_ScatterGatherLimit * sizeof(DAC960_V2_ScatterGatherSegment_T),
        sizeof(DAC960_V2_ScatterGatherSegment_T), 0);
      if (ScatterGatherPool == NULL)
            return DAC960_Failure(Controller,
                        "AUXILIARY STRUCTURE CREATION (SG)");
      RequestSensePool = pci_pool_create("DAC960_V2_RequestSense",
                Controller->PCIDevice, sizeof(DAC960_SCSI_RequestSense_T),
                sizeof(int), 0);
      if (RequestSensePool == NULL) {
            pci_pool_destroy(ScatterGatherPool);
            return DAC960_Failure(Controller,
                        "AUXILIARY STRUCTURE CREATION (SG)");
      }
      Controller->ScatterGatherPool = ScatterGatherPool;
      Controller->V2.RequestSensePool = RequestSensePool;
    }
  Controller->CommandAllocationGroupSize = CommandAllocationGroupSize;
  Controller->FreeCommands = NULL;
  for (CommandIdentifier = 1;
       CommandIdentifier <= Controller->DriverQueueDepth;
       CommandIdentifier++)
    {
      DAC960_Command_T *Command;
      if (--CommandsRemaining <= 0)
        {
          CommandsRemaining =
                Controller->DriverQueueDepth - CommandIdentifier + 1;
          if (CommandsRemaining > CommandAllocationGroupSize)
                CommandsRemaining = CommandAllocationGroupSize;
          CommandGroupByteCount =
                CommandsRemaining * CommandAllocationLength;
          AllocationPointer = kzalloc(CommandGroupByteCount, GFP_ATOMIC);
          if (AllocationPointer == NULL)
                return DAC960_Failure(Controller,
                                        "AUXILIARY STRUCTURE CREATION");
         }
      Command = (DAC960_Command_T *) AllocationPointer;
      AllocationPointer += CommandAllocationLength;
      Command->CommandIdentifier = CommandIdentifier;
      Command->Controller = Controller;
      Command->Next = Controller->FreeCommands;
      Controller->FreeCommands = Command;
      Controller->Commands[CommandIdentifier-1] = Command;
      ScatterGatherCPU = pci_pool_alloc(ScatterGatherPool, GFP_ATOMIC,
                                                        &ScatterGatherDMA);
      if (ScatterGatherCPU == NULL)
          return DAC960_Failure(Controller, "AUXILIARY STRUCTURE CREATION");

      if (RequestSensePool != NULL) {
          RequestSenseCPU = pci_pool_alloc(RequestSensePool, GFP_ATOMIC,
                                                &RequestSenseDMA);
          if (RequestSenseCPU == NULL) {
                pci_pool_free(ScatterGatherPool, ScatterGatherCPU,
                                ScatterGatherDMA);
                return DAC960_Failure(Controller,
                                        "AUXILIARY STRUCTURE CREATION");
          }
        }
     if (Controller->FirmwareType == DAC960_V1_Controller) {
        Command->cmd_sglist = Command->V1.ScatterList;
        Command->V1.ScatterGatherList =
                (DAC960_V1_ScatterGatherSegment_T *)ScatterGatherCPU;
        Command->V1.ScatterGatherListDMA = ScatterGatherDMA;
        sg_init_table(Command->cmd_sglist, DAC960_V1_ScatterGatherLimit);
      } else {
        Command->cmd_sglist = Command->V2.ScatterList;
        Command->V2.ScatterGatherList =
                (DAC960_V2_ScatterGatherSegment_T *)ScatterGatherCPU;
        Command->V2.ScatterGatherListDMA = ScatterGatherDMA;
        Command->V2.RequestSense =
                                (DAC960_SCSI_RequestSense_T *)RequestSenseCPU;
        Command->V2.RequestSenseDMA = RequestSenseDMA;
        sg_init_table(Command->cmd_sglist, DAC960_V2_ScatterGatherLimit);
      }
    }
  return true;
}


/*
  DAC960_DestroyAuxiliaryStructures deallocates the auxiliary data
  structures for Controller.
*/

static void DAC960_DestroyAuxiliaryStructures(DAC960_Controller_T *Controller)
{
  int i;
  struct pci_pool *ScatterGatherPool = Controller->ScatterGatherPool;
  struct pci_pool *RequestSensePool = NULL;
  void *ScatterGatherCPU;
  dma_addr_t ScatterGatherDMA;
  void *RequestSenseCPU;
  dma_addr_t RequestSenseDMA;
  DAC960_Command_T *CommandGroup = NULL;
  

  if (Controller->FirmwareType == DAC960_V2_Controller)
        RequestSensePool = Controller->V2.RequestSensePool;

  Controller->FreeCommands = NULL;
  for (i = 0; i < Controller->DriverQueueDepth; i++)
    {
      DAC960_Command_T *Command = Controller->Commands[i];

      if (Command == NULL)
          continue;

      if (Controller->FirmwareType == DAC960_V1_Controller) {
          ScatterGatherCPU = (void *)Command->V1.ScatterGatherList;
          ScatterGatherDMA = Command->V1.ScatterGatherListDMA;
          RequestSenseCPU = NULL;
          RequestSenseDMA = (dma_addr_t)0;
      } else {
          ScatterGatherCPU = (void *)Command->V2.ScatterGatherList;
          ScatterGatherDMA = Command->V2.ScatterGatherListDMA;
          RequestSenseCPU = (void *)Command->V2.RequestSense;
          RequestSenseDMA = Command->V2.RequestSenseDMA;
      }
      if (ScatterGatherCPU != NULL)
          pci_pool_free(ScatterGatherPool, ScatterGatherCPU, ScatterGatherDMA);
      if (RequestSenseCPU != NULL)
          pci_pool_free(RequestSensePool, RequestSenseCPU, RequestSenseDMA);

      if ((Command->CommandIdentifier
           % Controller->CommandAllocationGroupSize) == 1) {
           /*
            * We can't free the group of commands until all of the
            * request sense and scatter gather dma structures are free.
            * Remember the beginning of the group, but don't free it
            * until we've reached the beginning of the next group.
            */
           kfree(CommandGroup);
           CommandGroup = Command;
      }
      Controller->Commands[i] = NULL;
    }
  kfree(CommandGroup);

  if (Controller->CombinedStatusBuffer != NULL)
    {
      kfree(Controller->CombinedStatusBuffer);
      Controller->CombinedStatusBuffer = NULL;
      Controller->CurrentStatusBuffer = NULL;
    }

  if (ScatterGatherPool != NULL)
        pci_pool_destroy(ScatterGatherPool);
  if (Controller->FirmwareType == DAC960_V1_Controller)
        return;

  if (RequestSensePool != NULL)
        pci_pool_destroy(RequestSensePool);

  for (i = 0; i < DAC960_MaxLogicalDrives; i++) {
        kfree(Controller->V2.LogicalDeviceInformation[i]);
        Controller->V2.LogicalDeviceInformation[i] = NULL;
  }

  for (i = 0; i < DAC960_V2_MaxPhysicalDevices; i++)
    {
      kfree(Controller->V2.PhysicalDeviceInformation[i]);
      Controller->V2.PhysicalDeviceInformation[i] = NULL;
      kfree(Controller->V2.InquiryUnitSerialNumber[i]);
      Controller->V2.InquiryUnitSerialNumber[i] = NULL;
    }
}


/*
  DAC960_V1_ClearCommand clears critical fields of Command for DAC960 V1
  Firmware Controllers.
*/

static inline void DAC960_V1_ClearCommand(DAC960_Command_T *Command)
{
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  memset(CommandMailbox, 0, sizeof(DAC960_V1_CommandMailbox_T));
  Command->V1.CommandStatus = 0;
}


/*
  DAC960_V2_ClearCommand clears critical fields of Command for DAC960 V2
  Firmware Controllers.
*/

static inline void DAC960_V2_ClearCommand(DAC960_Command_T *Command)
{
  DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
  memset(CommandMailbox, 0, sizeof(DAC960_V2_CommandMailbox_T));
  Command->V2.CommandStatus = 0;
}


/*
  DAC960_AllocateCommand allocates a Command structure from Controller's
  free list.  During driver initialization, a special initialization command
  has been placed on the free list to guarantee that command allocation can
  never fail.
*/

static inline DAC960_Command_T *DAC960_AllocateCommand(DAC960_Controller_T
                                                       *Controller)
{
  DAC960_Command_T *Command = Controller->FreeCommands;
  if (Command == NULL) return NULL;
  Controller->FreeCommands = Command->Next;
  Command->Next = NULL;
  return Command;
}


/*
  DAC960_DeallocateCommand deallocates Command, returning it to Controller's
  free list.
*/

static inline void DAC960_DeallocateCommand(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;

  Command->Request = NULL;
  Command->Next = Controller->FreeCommands;
  Controller->FreeCommands = Command;
}


/*
  DAC960_WaitForCommand waits for a wake_up on Controller's Command Wait Queue.
*/

static void DAC960_WaitForCommand(DAC960_Controller_T *Controller)
{
  spin_unlock_irq(&Controller->queue_lock);
  __wait_event(Controller->CommandWaitQueue, Controller->FreeCommands);
  spin_lock_irq(&Controller->queue_lock);
}

/*
  DAC960_GEM_QueueCommand queues Command for DAC960 GEM Series Controllers.
*/

static void DAC960_GEM_QueueCommand(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
  DAC960_V2_CommandMailbox_T *NextCommandMailbox =
      Controller->V2.NextCommandMailbox;

  CommandMailbox->Common.CommandIdentifier = Command->CommandIdentifier;
  DAC960_GEM_WriteCommandMailbox(NextCommandMailbox, CommandMailbox);

  if (Controller->V2.PreviousCommandMailbox1->Words[0] == 0 ||
      Controller->V2.PreviousCommandMailbox2->Words[0] == 0)
      DAC960_GEM_MemoryMailboxNewCommand(ControllerBaseAddress);

  Controller->V2.PreviousCommandMailbox2 =
      Controller->V2.PreviousCommandMailbox1;
  Controller->V2.PreviousCommandMailbox1 = NextCommandMailbox;

  if (++NextCommandMailbox > Controller->V2.LastCommandMailbox)
      NextCommandMailbox = Controller->V2.FirstCommandMailbox;

  Controller->V2.NextCommandMailbox = NextCommandMailbox;
}

/*
  DAC960_BA_QueueCommand queues Command for DAC960 BA Series Controllers.
*/

static void DAC960_BA_QueueCommand(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
  DAC960_V2_CommandMailbox_T *NextCommandMailbox =
    Controller->V2.NextCommandMailbox;
  CommandMailbox->Common.CommandIdentifier = Command->CommandIdentifier;
  DAC960_BA_WriteCommandMailbox(NextCommandMailbox, CommandMailbox);
  if (Controller->V2.PreviousCommandMailbox1->Words[0] == 0 ||
      Controller->V2.PreviousCommandMailbox2->Words[0] == 0)
    DAC960_BA_MemoryMailboxNewCommand(ControllerBaseAddress);
  Controller->V2.PreviousCommandMailbox2 =
    Controller->V2.PreviousCommandMailbox1;
  Controller->V2.PreviousCommandMailbox1 = NextCommandMailbox;
  if (++NextCommandMailbox > Controller->V2.LastCommandMailbox)
    NextCommandMailbox = Controller->V2.FirstCommandMailbox;
  Controller->V2.NextCommandMailbox = NextCommandMailbox;
}


/*
  DAC960_LP_QueueCommand queues Command for DAC960 LP Series Controllers.
*/

static void DAC960_LP_QueueCommand(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
  DAC960_V2_CommandMailbox_T *NextCommandMailbox =
    Controller->V2.NextCommandMailbox;
  CommandMailbox->Common.CommandIdentifier = Command->CommandIdentifier;
  DAC960_LP_WriteCommandMailbox(NextCommandMailbox, CommandMailbox);
  if (Controller->V2.PreviousCommandMailbox1->Words[0] == 0 ||
      Controller->V2.PreviousCommandMailbox2->Words[0] == 0)
    DAC960_LP_MemoryMailboxNewCommand(ControllerBaseAddress);
  Controller->V2.PreviousCommandMailbox2 =
    Controller->V2.PreviousCommandMailbox1;
  Controller->V2.PreviousCommandMailbox1 = NextCommandMailbox;
  if (++NextCommandMailbox > Controller->V2.LastCommandMailbox)
    NextCommandMailbox = Controller->V2.FirstCommandMailbox;
  Controller->V2.NextCommandMailbox = NextCommandMailbox;
}


/*
  DAC960_LA_QueueCommandDualMode queues Command for DAC960 LA Series
  Controllers with Dual Mode Firmware.
*/

static void DAC960_LA_QueueCommandDualMode(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  DAC960_V1_CommandMailbox_T *NextCommandMailbox =
    Controller->V1.NextCommandMailbox;
  CommandMailbox->Common.CommandIdentifier = Command->CommandIdentifier;
  DAC960_LA_WriteCommandMailbox(NextCommandMailbox, CommandMailbox);
  if (Controller->V1.PreviousCommandMailbox1->Words[0] == 0 ||
      Controller->V1.PreviousCommandMailbox2->Words[0] == 0)
    DAC960_LA_MemoryMailboxNewCommand(ControllerBaseAddress);
  Controller->V1.PreviousCommandMailbox2 =
    Controller->V1.PreviousCommandMailbox1;
  Controller->V1.PreviousCommandMailbox1 = NextCommandMailbox;
  if (++NextCommandMailbox > Controller->V1.LastCommandMailbox)
    NextCommandMailbox = Controller->V1.FirstCommandMailbox;
  Controller->V1.NextCommandMailbox = NextCommandMailbox;
}


/*
  DAC960_LA_QueueCommandSingleMode queues Command for DAC960 LA Series
  Controllers with Single Mode Firmware.
*/

static void DAC960_LA_QueueCommandSingleMode(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  DAC960_V1_CommandMailbox_T *NextCommandMailbox =
    Controller->V1.NextCommandMailbox;
  CommandMailbox->Common.CommandIdentifier = Command->CommandIdentifier;
  DAC960_LA_WriteCommandMailbox(NextCommandMailbox, CommandMailbox);
  if (Controller->V1.PreviousCommandMailbox1->Words[0] == 0 ||
      Controller->V1.PreviousCommandMailbox2->Words[0] == 0)
    DAC960_LA_HardwareMailboxNewCommand(ControllerBaseAddress);
  Controller->V1.PreviousCommandMailbox2 =
    Controller->V1.PreviousCommandMailbox1;
  Controller->V1.PreviousCommandMailbox1 = NextCommandMailbox;
  if (++NextCommandMailbox > Controller->V1.LastCommandMailbox)
    NextCommandMailbox = Controller->V1.FirstCommandMailbox;
  Controller->V1.NextCommandMailbox = NextCommandMailbox;
}


/*
  DAC960_PG_QueueCommandDualMode queues Command for DAC960 PG Series
  Controllers with Dual Mode Firmware.
*/

static void DAC960_PG_QueueCommandDualMode(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  DAC960_V1_CommandMailbox_T *NextCommandMailbox =
    Controller->V1.NextCommandMailbox;
  CommandMailbox->Common.CommandIdentifier = Command->CommandIdentifier;
  DAC960_PG_WriteCommandMailbox(NextCommandMailbox, CommandMailbox);
  if (Controller->V1.PreviousCommandMailbox1->Words[0] == 0 ||
      Controller->V1.PreviousCommandMailbox2->Words[0] == 0)
    DAC960_PG_MemoryMailboxNewCommand(ControllerBaseAddress);
  Controller->V1.PreviousCommandMailbox2 =
    Controller->V1.PreviousCommandMailbox1;
  Controller->V1.PreviousCommandMailbox1 = NextCommandMailbox;
  if (++NextCommandMailbox > Controller->V1.LastCommandMailbox)
    NextCommandMailbox = Controller->V1.FirstCommandMailbox;
  Controller->V1.NextCommandMailbox = NextCommandMailbox;
}


/*
  DAC960_PG_QueueCommandSingleMode queues Command for DAC960 PG Series
  Controllers with Single Mode Firmware.
*/

static void DAC960_PG_QueueCommandSingleMode(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  DAC960_V1_CommandMailbox_T *NextCommandMailbox =
    Controller->V1.NextCommandMailbox;
  CommandMailbox->Common.CommandIdentifier = Command->CommandIdentifier;
  DAC960_PG_WriteCommandMailbox(NextCommandMailbox, CommandMailbox);
  if (Controller->V1.PreviousCommandMailbox1->Words[0] == 0 ||
      Controller->V1.PreviousCommandMailbox2->Words[0] == 0)
    DAC960_PG_HardwareMailboxNewCommand(ControllerBaseAddress);
  Controller->V1.PreviousCommandMailbox2 =
    Controller->V1.PreviousCommandMailbox1;
  Controller->V1.PreviousCommandMailbox1 = NextCommandMailbox;
  if (++NextCommandMailbox > Controller->V1.LastCommandMailbox)
    NextCommandMailbox = Controller->V1.FirstCommandMailbox;
  Controller->V1.NextCommandMailbox = NextCommandMailbox;
}


/*
  DAC960_PD_QueueCommand queues Command for DAC960 PD Series Controllers.
*/

static void DAC960_PD_QueueCommand(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  CommandMailbox->Common.CommandIdentifier = Command->CommandIdentifier;
  while (DAC960_PD_MailboxFullP(ControllerBaseAddress))
    udelay(1);
  DAC960_PD_WriteCommandMailbox(ControllerBaseAddress, CommandMailbox);
  DAC960_PD_NewCommand(ControllerBaseAddress);
}


/*
  DAC960_P_QueueCommand queues Command for DAC960 P Series Controllers.
*/

static void DAC960_P_QueueCommand(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  CommandMailbox->Common.CommandIdentifier = Command->CommandIdentifier;
  switch (CommandMailbox->Common.CommandOpcode)
    {
    case DAC960_V1_Enquiry:
      CommandMailbox->Common.CommandOpcode = DAC960_V1_Enquiry_Old;
      break;
    case DAC960_V1_GetDeviceState:
      CommandMailbox->Common.CommandOpcode = DAC960_V1_GetDeviceState_Old;
      break;
    case DAC960_V1_Read:
      CommandMailbox->Common.CommandOpcode = DAC960_V1_Read_Old;
      DAC960_PD_To_P_TranslateReadWriteCommand(CommandMailbox);
      break;
    case DAC960_V1_Write:
      CommandMailbox->Common.CommandOpcode = DAC960_V1_Write_Old;
      DAC960_PD_To_P_TranslateReadWriteCommand(CommandMailbox);
      break;
    case DAC960_V1_ReadWithScatterGather:
      CommandMailbox->Common.CommandOpcode =
        DAC960_V1_ReadWithScatterGather_Old;
      DAC960_PD_To_P_TranslateReadWriteCommand(CommandMailbox);
      break;
    case DAC960_V1_WriteWithScatterGather:
      CommandMailbox->Common.CommandOpcode =
        DAC960_V1_WriteWithScatterGather_Old;
      DAC960_PD_To_P_TranslateReadWriteCommand(CommandMailbox);
      break;
    default:
      break;
    }
  while (DAC960_PD_MailboxFullP(ControllerBaseAddress))
    udelay(1);
  DAC960_PD_WriteCommandMailbox(ControllerBaseAddress, CommandMailbox);
  DAC960_PD_NewCommand(ControllerBaseAddress);
}


/*
  DAC960_ExecuteCommand executes Command and waits for completion.
*/

static void DAC960_ExecuteCommand(DAC960_Command_T *Command)
{
  DAC960_Controller_T *Controller = Command->Controller;
  DECLARE_COMPLETION_ONSTACK(Completion);
  unsigned long flags;
  Command->Completion = &Completion;

  spin_lock_irqsave(&Controller->queue_lock, flags);
  DAC960_QueueCommand(Command);
  spin_unlock_irqrestore(&Controller->queue_lock, flags);
 
  if (in_interrupt())
          return;
  wait_for_completion(&Completion);
}


/*
  DAC960_V1_ExecuteType3 executes a DAC960 V1 Firmware Controller Type 3
  Command and waits for completion.  It returns true on success and false
  on failure.
*/

static bool DAC960_V1_ExecuteType3(DAC960_Controller_T *Controller,
                                      DAC960_V1_CommandOpcode_T CommandOpcode,
                                      dma_addr_t DataDMA)
{
  DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  DAC960_V1_CommandStatus_T CommandStatus;
  DAC960_V1_ClearCommand(Command);
  Command->CommandType = DAC960_ImmediateCommand;
  CommandMailbox->Type3.CommandOpcode = CommandOpcode;
  CommandMailbox->Type3.BusAddress = DataDMA;
  DAC960_ExecuteCommand(Command);
  CommandStatus = Command->V1.CommandStatus;
  DAC960_DeallocateCommand(Command);
  return (CommandStatus == DAC960_V1_NormalCompletion);
}


/*
  DAC960_V1_ExecuteTypeB executes a DAC960 V1 Firmware Controller Type 3B
  Command and waits for completion.  It returns true on success and false
  on failure.
*/

static bool DAC960_V1_ExecuteType3B(DAC960_Controller_T *Controller,
                                       DAC960_V1_CommandOpcode_T CommandOpcode,
                                       unsigned char CommandOpcode2,
                                       dma_addr_t DataDMA)
{
  DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  DAC960_V1_CommandStatus_T CommandStatus;
  DAC960_V1_ClearCommand(Command);
  Command->CommandType = DAC960_ImmediateCommand;
  CommandMailbox->Type3B.CommandOpcode = CommandOpcode;
  CommandMailbox->Type3B.CommandOpcode2 = CommandOpcode2;
  CommandMailbox->Type3B.BusAddress = DataDMA;
  DAC960_ExecuteCommand(Command);
  CommandStatus = Command->V1.CommandStatus;
  DAC960_DeallocateCommand(Command);
  return (CommandStatus == DAC960_V1_NormalCompletion);
}


/*
  DAC960_V1_ExecuteType3D executes a DAC960 V1 Firmware Controller Type 3D
  Command and waits for completion.  It returns true on success and false
  on failure.
*/

static bool DAC960_V1_ExecuteType3D(DAC960_Controller_T *Controller,
                                       DAC960_V1_CommandOpcode_T CommandOpcode,
                                       unsigned char Channel,
                                       unsigned char TargetID,
                                       dma_addr_t DataDMA)
{
  DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
  DAC960_V1_CommandMailbox_T *CommandMailbox = &Command->V1.CommandMailbox;
  DAC960_V1_CommandStatus_T CommandStatus;
  DAC960_V1_ClearCommand(Command);
  Command->CommandType = DAC960_ImmediateCommand;
  CommandMailbox->Type3D.CommandOpcode = CommandOpcode;
  CommandMailbox->Type3D.Channel = Channel;
  CommandMailbox->Type3D.TargetID = TargetID;
  CommandMailbox->Type3D.BusAddress = DataDMA;
  DAC960_ExecuteCommand(Command);
  CommandStatus = Command->V1.CommandStatus;
  DAC960_DeallocateCommand(Command);
  return (CommandStatus == DAC960_V1_NormalCompletion);
}


/*
  DAC960_V2_GeneralInfo executes a DAC960 V2 Firmware General Information
  Reading IOCTL Command and waits for completion.  It returns true on success
  and false on failure.

  Return data in The controller's HealthStatusBuffer, which is dma-able memory
*/

static bool DAC960_V2_GeneralInfo(DAC960_Controller_T *Controller)
{
  DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
  DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
  DAC960_V2_CommandStatus_T CommandStatus;
  DAC960_V2_ClearCommand(Command);
  Command->CommandType = DAC960_ImmediateCommand;
  CommandMailbox->Common.CommandOpcode = DAC960_V2_IOCTL;
  CommandMailbox->Common.CommandControlBits
                        .DataTransferControllerToHost = true;
  CommandMailbox->Common.CommandControlBits
                        .NoAutoRequestSense = true;
  CommandMailbox->Common.DataTransferSize = sizeof(DAC960_V2_HealthStatusBuffer_T);
  CommandMailbox->Common.IOCTL_Opcode = DAC960_V2_GetHealthStatus;
  CommandMailbox->Common.DataTransferMemoryAddress
                        .ScatterGatherSegments[0]
                        .SegmentDataPointer =
    Controller->V2.HealthStatusBufferDMA;
  CommandMailbox->Common.DataTransferMemoryAddress
                        .ScatterGatherSegments[0]
                        .SegmentByteCount =
    CommandMailbox->Common.DataTransferSize;
  DAC960_ExecuteCommand(Command);
  CommandStatus = Command->V2.CommandStatus;
  DAC960_DeallocateCommand(Command);
  return (CommandStatus == DAC960_V2_NormalCompletion);
}


/*
  DAC960_V2_ControllerInfo executes a DAC960 V2 Firmware Controller
  Information Reading IOCTL Command and waits for completion.  It returns
  true on success and false on failure.

  Data is returned in the controller's V2.NewControllerInformation dma-able
  memory buffer.
*/

static bool DAC960_V2_NewControllerInfo(DAC960_Controller_T *Controller)
{
  DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
  DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
  DAC960_V2_CommandStatus_T CommandStatus;
  DAC960_V2_ClearCommand(Command);
  Command->CommandType = DAC960_ImmediateCommand;
  CommandMailbox->ControllerInfo.CommandOpcode = DAC960_V2_IOCTL;
  CommandMailbox->ControllerInfo.CommandControlBits
                                .DataTransferControllerToHost = true;
  CommandMailbox->ControllerInfo.CommandControlBits
                                .NoAutoRequestSense = true;
  CommandMailbox->ControllerInfo.DataTransferSize = sizeof(DAC960_V2_ControllerInfo_T);
  CommandMailbox->ControllerInfo.ControllerNumber = 0;
  CommandMailbox->ControllerInfo.IOCTL_Opcode = DAC960_V2_GetControllerInfo;
  CommandMailbox->ControllerInfo.DataTransferMemoryAddress
                                .ScatterGatherSegments[0]
                                .SegmentDataPointer =
        Controller->V2.NewControllerInformationDMA;
  CommandMailbox->ControllerInfo.DataTransferMemoryAddress
                                .ScatterGatherSegments[0]
                                .SegmentByteCount =
    CommandMailbox->ControllerInfo.DataTransferSize;
  DAC960_ExecuteCommand(Command);
  CommandStatus = Command->V2.CommandStatus;
  DAC960_DeallocateCommand(Command);
  return (CommandStatus == DAC960_V2_NormalCompletion);
}


/*
  DAC960_V2_LogicalDeviceInfo executes a DAC960 V2 Firmware Controller Logical
  Device Information Reading IOCTL Command and waits for completion.  It
  returns true on success and false on failure.

  Data is returned in the controller's V2.NewLogicalDeviceInformation
*/

static bool DAC960_V2_NewLogicalDeviceInfo(DAC960_Controller_T *Controller,
                                           unsigned short LogicalDeviceNumber)
{
  DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
  DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
  DAC960_V2_CommandStatus_T CommandStatus;

  DAC960_V2_ClearCommand(Command);
  Command->CommandType = DAC960_ImmediateCommand;
  CommandMailbox->LogicalDeviceInfo.CommandOpcode =
                                DAC960_V2_IOCTL;
  CommandMailbox->LogicalDeviceInfo.CommandControlBits
                                   .DataTransferControllerToHost = true;
  CommandMailbox->LogicalDeviceInfo.CommandControlBits
                                   .NoAutoRequestSense = true;
  CommandMailbox->LogicalDeviceInfo.DataTransferSize = 
                                sizeof(DAC960_V2_LogicalDeviceInfo_T);
  CommandMailbox->LogicalDeviceInfo.LogicalDevice.LogicalDeviceNumber =
    LogicalDeviceNumber;
  CommandMailbox->LogicalDeviceInfo.IOCTL_Opcode = DAC960_V2_GetLogicalDeviceInfoValid;
  CommandMailbox->LogicalDeviceInfo.DataTransferMemoryAddress
                                   .ScatterGatherSegments[0]
                                   .SegmentDataPointer =
        Controller->V2.NewLogicalDeviceInformationDMA;
  CommandMailbox->LogicalDeviceInfo.DataTransferMemoryAddress
                                   .ScatterGatherSegments[0]
                                   .SegmentByteCount =
    CommandMailbox->LogicalDeviceInfo.DataTransferSize;
  DAC960_ExecuteCommand(Command);
  CommandStatus = Command->V2.CommandStatus;
  DAC960_DeallocateCommand(Command);
  return (CommandStatus == DAC960_V2_NormalCompletion);
}


/*
  DAC960_V2_PhysicalDeviceInfo executes a DAC960 V2 Firmware Controller "Read
  Physical Device Information" IOCTL Command and waits for completion.  It
  returns true on success and false on failure.

  The Channel, TargetID, LogicalUnit arguments should be 0 the first time
  this function is called for a given controller.  This will return data
  for the "first" device on that controller.  The returned data includes a
  Channel, TargetID, LogicalUnit that can be passed in to this routine to
  get data for the NEXT device on that controller.

  Data is stored in the controller's V2.NewPhysicalDeviceInfo dma-able
  memory buffer.

*/

static bool DAC960_V2_NewPhysicalDeviceInfo(DAC960_Controller_T *Controller,
                                            unsigned char Channel,
                                            unsigned char TargetID,
                                            unsigned char LogicalUnit)
{
  DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
  DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
  DAC960_V2_CommandStatus_T CommandStatus;

  DAC960_V2_ClearCommand(Command);
  Command->CommandType = DAC960_ImmediateCommand;
  CommandMailbox->PhysicalDeviceInfo.CommandOpcode = DAC960_V2_IOCTL;
  CommandMailbox->PhysicalDeviceInfo.CommandControlBits
                                    .DataTransferControllerToHost = true;
  CommandMailbox->PhysicalDeviceInfo.CommandControlBits
                                    .NoAutoRequestSense = true;
  CommandMailbox->PhysicalDeviceInfo.DataTransferSize =
                                sizeof(DAC960_V2_PhysicalDeviceInfo_T);
  CommandMailbox->PhysicalDeviceInfo.PhysicalDevice.LogicalUnit = LogicalUnit;
  CommandMailbox->PhysicalDeviceInfo.PhysicalDevice.TargetID = TargetID;
  CommandMailbox->PhysicalDeviceInfo.PhysicalDevice.Channel = Channel;
  CommandMailbox->PhysicalDeviceInfo.IOCTL_Opcode =
                                        DAC960_V2_GetPhysicalDeviceInfoValid;
  CommandMailbox->PhysicalDeviceInfo.DataTransferMemoryAddress
                                    .ScatterGatherSegments[0]
                                    .SegmentDataPointer =
                                        Controller->V2.NewPhysicalDeviceInformationDMA;
  CommandMailbox->PhysicalDeviceInfo.DataTransferMemoryAddress
                                    .ScatterGatherSegments[0]
                                    .SegmentByteCount =
    CommandMailbox->PhysicalDeviceInfo.DataTransferSize;
  DAC960_ExecuteCommand(Command);
  CommandStatus = Command->V2.CommandStatus;
  DAC960_DeallocateCommand(Command);
  return (CommandStatus == DAC960_V2_NormalCompletion);
}


static void DAC960_V2_ConstructNewUnitSerialNumber(
        DAC960_Controller_T *Controller,
        DAC960_V2_CommandMailbox_T *CommandMailbox, int Channel, int TargetID,
        int LogicalUnit)
{
      CommandMailbox->SCSI_10.CommandOpcode = DAC960_V2_SCSI_10_Passthru;
      CommandMailbox->SCSI_10.CommandControlBits
                             .DataTransferControllerToHost = true;
      CommandMailbox->SCSI_10.CommandControlBits
                             .NoAutoRequestSense = true;
      CommandMailbox->SCSI_10.DataTransferSize =
        sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T);
      CommandMailbox->SCSI_10.PhysicalDevice.LogicalUnit = LogicalUnit;
      CommandMailbox->SCSI_10.PhysicalDevice.TargetID = TargetID;
      CommandMailbox->SCSI_10.PhysicalDevice.Channel = Channel;
      CommandMailbox->SCSI_10.CDBLength = 6;
      CommandMailbox->SCSI_10.SCSI_CDB[0] = 0x12; /* INQUIRY */
      CommandMailbox->SCSI_10.SCSI_CDB[1] = 1; /* EVPD = 1 */
      CommandMailbox->SCSI_10.SCSI_CDB[2] = 0x80; /* Page Code */
      CommandMailbox->SCSI_10.SCSI_CDB[3] = 0; /* Reserved */
      CommandMailbox->SCSI_10.SCSI_CDB[4] =
        sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T);
      CommandMailbox->SCSI_10.SCSI_CDB[5] = 0; /* Control */
      CommandMailbox->SCSI_10.DataTransferMemoryAddress
                             .ScatterGatherSegments[0]
                             .SegmentDataPointer =
                Controller->V2.NewInquiryUnitSerialNumberDMA;
      CommandMailbox->SCSI_10.DataTransferMemoryAddress
                             .ScatterGatherSegments[0]
                             .SegmentByteCount =
                CommandMailbox->SCSI_10.DataTransferSize;
}


/*
  DAC960_V2_NewUnitSerialNumber executes an SCSI pass-through
  Inquiry command to a SCSI device identified by Channel number,
  Target id, Logical Unit Number.  This function Waits for completion
  of the command.

  The return data includes Unit Serial Number information for the
  specified device.

  Data is stored in the controller's V2.NewPhysicalDeviceInfo dma-able
  memory buffer.
*/

static bool DAC960_V2_NewInquiryUnitSerialNumber(DAC960_Controller_T *Controller,
                        int Channel, int TargetID, int LogicalUnit)
{
      DAC960_Command_T *Command;
      DAC960_V2_CommandMailbox_T *CommandMailbox;
      DAC960_V2_CommandStatus_T CommandStatus;

      Command = DAC960_AllocateCommand(Controller);
      CommandMailbox = &Command->V2.CommandMailbox;
      DAC960_V2_ClearCommand(Command);
      Command->CommandType = DAC960_ImmediateCommand;

      DAC960_V2_ConstructNewUnitSerialNumber(Controller, CommandMailbox,
                        Channel, TargetID, LogicalUnit);

      DAC960_ExecuteCommand(Command);
      CommandStatus = Command->V2.CommandStatus;
      DAC960_DeallocateCommand(Command);
      return (CommandStatus == DAC960_V2_NormalCompletion);
}


/*
  DAC960_V2_DeviceOperation executes a DAC960 V2 Firmware Controller Device
  Operation IOCTL Command and waits for completion.  It returns true on
  success and false on failure.
*/

static bool DAC960_V2_DeviceOperation(DAC960_Controller_T *Controller,
                                         DAC960_V2_IOCTL_Opcode_T IOCTL_Opcode,
                                         DAC960_V2_OperationDevice_T
                                           OperationDevice)
{
  DAC960_Command_T *Command = DAC960_AllocateCommand(Controller);
  DAC960_V2_CommandMailbox_T *CommandMailbox = &Command->V2.CommandMailbox;
  DAC960_V2_CommandStatus_T CommandStatus;
  DAC960_V2_ClearCommand(Command);
  Command->CommandType = DAC960_ImmediateCommand;
  CommandMailbox->DeviceOperation.CommandOpcode = DAC960_V2_IOCTL;
  CommandMailbox->DeviceOperation.CommandControlBits
                                 .DataTransferControllerToHost = true;
  CommandMailbox->DeviceOperation.CommandControlBits
                                 .NoAutoRequestSense = true;
  CommandMailbox->DeviceOperation.IOCTL_Opcode = IOCTL_Opcode;
  CommandMailbox->DeviceOperation.OperationDevice = OperationDevice;
  DAC960_ExecuteCommand(Command);
  CommandStatus = Command->V2.CommandStatus;
  DAC960_DeallocateCommand(Command);
  return (CommandStatus == DAC960_V2_NormalCompletion);
}


/*
  DAC960_V1_EnableMemoryMailboxInterface enables the Memory Mailbox Interface
  for DAC960 V1 Firmware Controllers.

  PD and P controller types have no memory mailbox, but still need the
  other dma mapped memory.
*/

static bool DAC960_V1_EnableMemoryMailboxInterface(DAC960_Controller_T
                                                      *Controller)
{
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  DAC960_HardwareType_T hw_type = Controller->HardwareType;
  struct pci_dev *PCI_Device = Controller->PCIDevice;
  struct dma_loaf *DmaPages = &Controller->DmaPages;
  size_t DmaPagesSize;
  size_t CommandMailboxesSize;
  size_t StatusMailboxesSize;

  DAC960_V1_CommandMailbox_T *CommandMailboxesMemory;
  dma_addr_t CommandMailboxesMemoryDMA;

  DAC960_V1_StatusMailbox_T *StatusMailboxesMemory;
  dma_addr_t StatusMailboxesMemoryDMA;

  DAC960_V1_CommandMailbox_T CommandMailbox;
  DAC960_V1_CommandStatus_T CommandStatus;
  int TimeoutCounter;
  int i;

  
  if (pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(32)))
        return DAC960_Failure(Controller, "DMA mask out of range");
  Controller->BounceBufferLimit = DMA_BIT_MASK(32);

  if ((hw_type == DAC960_PD_Controller) || (hw_type == DAC960_P_Controller)) {
    CommandMailboxesSize =  0;
    StatusMailboxesSize = 0;
  } else {
    CommandMailboxesSize =  DAC960_V1_CommandMailboxCount * sizeof(DAC960_V1_CommandMailbox_T);
    StatusMailboxesSize = DAC960_V1_StatusMailboxCount * sizeof(DAC960_V1_StatusMailbox_T);
  }
  DmaPagesSize = CommandMailboxesSize + StatusMailboxesSize + 
        sizeof(DAC960_V1_DCDB_T) + sizeof(DAC960_V1_Enquiry_T) +
        sizeof(DAC960_V1_ErrorTable_T) + sizeof(DAC960_V1_EventLogEntry_T) +
        sizeof(DAC960_V1_RebuildProgress_T) +
        sizeof(DAC960_V1_LogicalDriveInformationArray_T) +
        sizeof(DAC960_V1_BackgroundInitializationStatus_T) +
        sizeof(DAC960_V1_DeviceState_T) + sizeof(DAC960_SCSI_Inquiry_T) +
        sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T);

  if (!init_dma_loaf(PCI_Device, DmaPages, DmaPagesSize))
        return false;


  if ((hw_type == DAC960_PD_Controller) || (hw_type == DAC960_P_Controller)) 
        goto skip_mailboxes;

  CommandMailboxesMemory = slice_dma_loaf(DmaPages,
                CommandMailboxesSize, &CommandMailboxesMemoryDMA);
  
  /* These are the base addresses for the command memory mailbox array */
  Controller->V1.FirstCommandMailbox = CommandMailboxesMemory;
  Controller->V1.FirstCommandMailboxDMA = CommandMailboxesMemoryDMA;

  CommandMailboxesMemory += DAC960_V1_CommandMailboxCount - 1;
  Controller->V1.LastCommandMailbox = CommandMailboxesMemory;
  Controller->V1.NextCommandMailbox = Controller->V1.FirstCommandMailbox;
  Controller->V1.PreviousCommandMailbox1 = Controller->V1.LastCommandMailbox;
  Controller->V1.PreviousCommandMailbox2 =
                                        Controller->V1.LastCommandMailbox - 1;

  /* These are the base addresses for the status memory mailbox array */
  StatusMailboxesMemory = slice_dma_loaf(DmaPages,
                StatusMailboxesSize, &StatusMailboxesMemoryDMA);

  Controller->V1.FirstStatusMailbox = StatusMailboxesMemory;
  Controller->V1.FirstStatusMailboxDMA = StatusMailboxesMemoryDMA;
  StatusMailboxesMemory += DAC960_V1_StatusMailboxCount - 1;
  Controller->V1.LastStatusMailbox = StatusMailboxesMemory;
  Controller->V1.NextStatusMailbox = Controller->V1.FirstStatusMailbox;

skip_mailboxes:
  Controller->V1.MonitoringDCDB = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V1_DCDB_T),
                &Controller->V1.MonitoringDCDB_DMA);

  Controller->V1.NewEnquiry = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V1_Enquiry_T),
                &Controller->V1.NewEnquiryDMA);

  Controller->V1.NewErrorTable = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V1_ErrorTable_T),
                &Controller->V1.NewErrorTableDMA);

  Controller->V1.EventLogEntry = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V1_EventLogEntry_T),
                &Controller->V1.EventLogEntryDMA);

  Controller->V1.RebuildProgress = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V1_RebuildProgress_T),
                &Controller->V1.RebuildProgressDMA);

  Controller->V1.NewLogicalDriveInformation = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V1_LogicalDriveInformationArray_T),
                &Controller->V1.NewLogicalDriveInformationDMA);

  Controller->V1.BackgroundInitializationStatus = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V1_BackgroundInitializationStatus_T),
                &Controller->V1.BackgroundInitializationStatusDMA);

  Controller->V1.NewDeviceState = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V1_DeviceState_T),
                &Controller->V1.NewDeviceStateDMA);

  Controller->V1.NewInquiryStandardData = slice_dma_loaf(DmaPages,
                sizeof(DAC960_SCSI_Inquiry_T),
                &Controller->V1.NewInquiryStandardDataDMA);

  Controller->V1.NewInquiryUnitSerialNumber = slice_dma_loaf(DmaPages,
                sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T),
                &Controller->V1.NewInquiryUnitSerialNumberDMA);

  if ((hw_type == DAC960_PD_Controller) || (hw_type == DAC960_P_Controller))
        return true;
 
  /* Enable the Memory Mailbox Interface. */
  Controller->V1.DualModeMemoryMailboxInterface = true;
  CommandMailbox.TypeX.CommandOpcode = 0x2B;
  CommandMailbox.TypeX.CommandIdentifier = 0;
  CommandMailbox.TypeX.CommandOpcode2 = 0x14;
  CommandMailbox.TypeX.CommandMailboxesBusAddress =
                                Controller->V1.FirstCommandMailboxDMA;
  CommandMailbox.TypeX.StatusMailboxesBusAddress =
                                Controller->V1.FirstStatusMailboxDMA;
#define TIMEOUT_COUNT 1000000

  for (i = 0; i < 2; i++)
    switch (Controller->HardwareType)
      {
      case DAC960_LA_Controller:
        TimeoutCounter = TIMEOUT_COUNT;
        while (--TimeoutCounter >= 0)
          {
            if (!DAC960_LA_HardwareMailboxFullP(ControllerBaseAddress))
              break;
            udelay(10);
          }
        if (TimeoutCounter < 0) return false;
        DAC960_LA_WriteHardwareMailbox(ControllerBaseAddress, &CommandMailbox);
        DAC960_LA_HardwareMailboxNewCommand(ControllerBaseAddress);
        TimeoutCounter = TIMEOUT_COUNT;
        while (--TimeoutCounter >= 0)
          {
            if (DAC960_LA_HardwareMailboxStatusAvailableP(
                  ControllerBaseAddress))
              break;
            udelay(10);
          }
        if (TimeoutCounter < 0) return false;
        CommandStatus = DAC960_LA_ReadStatusRegister(ControllerBaseAddress);
        DAC960_LA_AcknowledgeHardwareMailboxInterrupt(ControllerBaseAddress);
        DAC960_LA_AcknowledgeHardwareMailboxStatus(ControllerBaseAddress);
        if (CommandStatus == DAC960_V1_NormalCompletion) return true;
        Controller->V1.DualModeMemoryMailboxInterface = false;
        CommandMailbox.TypeX.CommandOpcode2 = 0x10;
        break;
      case DAC960_PG_Controller:
        TimeoutCounter = TIMEOUT_COUNT;
        while (--TimeoutCounter >= 0)
          {
            if (!DAC960_PG_HardwareMailboxFullP(ControllerBaseAddress))
              break;
            udelay(10);
          }
        if (TimeoutCounter < 0) return false;
        DAC960_PG_WriteHardwareMailbox(ControllerBaseAddress, &CommandMailbox);
        DAC960_PG_HardwareMailboxNewCommand(ControllerBaseAddress);

        TimeoutCounter = TIMEOUT_COUNT;
        while (--TimeoutCounter >= 0)
          {
            if (DAC960_PG_HardwareMailboxStatusAvailableP(
                  ControllerBaseAddress))
              break;
            udelay(10);
          }
        if (TimeoutCounter < 0) return false;
        CommandStatus = DAC960_PG_ReadStatusRegister(ControllerBaseAddress);
        DAC960_PG_AcknowledgeHardwareMailboxInterrupt(ControllerBaseAddress);
        DAC960_PG_AcknowledgeHardwareMailboxStatus(ControllerBaseAddress);
        if (CommandStatus == DAC960_V1_NormalCompletion) return true;
        Controller->V1.DualModeMemoryMailboxInterface = false;
        CommandMailbox.TypeX.CommandOpcode2 = 0x10;
        break;
      default:
        DAC960_Failure(Controller, "Unknown Controller Type\n");
        break;
      }
  return false;
}


/*
  DAC960_V2_EnableMemoryMailboxInterface enables the Memory Mailbox Interface
  for DAC960 V2 Firmware Controllers.

  Aggregate the space needed for the controller's memory mailbox and
  the other data structures that will be targets of dma transfers with
  the controller.  Allocate a dma-mapped region of memory to hold these
  structures.  Then, save CPU pointers and dma_addr_t values to reference
  the structures that are contained in that region.
*/

static bool DAC960_V2_EnableMemoryMailboxInterface(DAC960_Controller_T
                                                      *Controller)
{
  void __iomem *ControllerBaseAddress = Controller->BaseAddress;
  struct pci_dev *PCI_Device = Controller->PCIDevice;
  struct dma_loaf *DmaPages = &Controller->DmaPages;
  size_t DmaPagesSize;
  size_t CommandMailboxesSize;
  size_t StatusMailboxesSize;

  DAC960_V2_CommandMailbox_T *CommandMailboxesMemory;
  dma_addr_t CommandMailboxesMemoryDMA;

  DAC960_V2_StatusMailbox_T *StatusMailboxesMemory;
  dma_addr_t StatusMailboxesMemoryDMA;

  DAC960_V2_CommandMailbox_T *CommandMailbox;
  dma_addr_t    CommandMailboxDMA;
  DAC960_V2_CommandStatus_T CommandStatus;

        if (!pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(64)))
                Controller->BounceBufferLimit = DMA_BIT_MASK(64);
        else if (!pci_set_dma_mask(Controller->PCIDevice, DMA_BIT_MASK(32)))
                Controller->BounceBufferLimit = DMA_BIT_MASK(32);
        else
                return DAC960_Failure(Controller, "DMA mask out of range");

  /* This is a temporary dma mapping, used only in the scope of this function */
  CommandMailbox = pci_alloc_consistent(PCI_Device,
                sizeof(DAC960_V2_CommandMailbox_T), &CommandMailboxDMA);
  if (CommandMailbox == NULL)
          return false;

  CommandMailboxesSize = DAC960_V2_CommandMailboxCount * sizeof(DAC960_V2_CommandMailbox_T);
  StatusMailboxesSize = DAC960_V2_StatusMailboxCount * sizeof(DAC960_V2_StatusMailbox_T);
  DmaPagesSize =
    CommandMailboxesSize + StatusMailboxesSize +
    sizeof(DAC960_V2_HealthStatusBuffer_T) +
    sizeof(DAC960_V2_ControllerInfo_T) +
    sizeof(DAC960_V2_LogicalDeviceInfo_T) +
    sizeof(DAC960_V2_PhysicalDeviceInfo_T) +
    sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T) +
    sizeof(DAC960_V2_Event_T) +
    sizeof(DAC960_V2_PhysicalToLogicalDevice_T);

  if (!init_dma_loaf(PCI_Device, DmaPages, DmaPagesSize)) {
        pci_free_consistent(PCI_Device, sizeof(DAC960_V2_CommandMailbox_T),
                                        CommandMailbox, CommandMailboxDMA);
        return false;
  }

  CommandMailboxesMemory = slice_dma_loaf(DmaPages,
                CommandMailboxesSize, &CommandMailboxesMemoryDMA);

  /* These are the base addresses for the command memory mailbox array */
  Controller->V2.FirstCommandMailbox = CommandMailboxesMemory;
  Controller->V2.FirstCommandMailboxDMA = CommandMailboxesMemoryDMA;

  CommandMailboxesMemory += DAC960_V2_CommandMailboxCount - 1;
  Controller->V2.LastCommandMailbox = CommandMailboxesMemory;
  Controller->V2.NextCommandMailbox = Controller->V2.FirstCommandMailbox;
  Controller->V2.PreviousCommandMailbox1 = Controller->V2.LastCommandMailbox;
  Controller->V2.PreviousCommandMailbox2 =
                                        Controller->V2.LastCommandMailbox - 1;

  /* These are the base addresses for the status memory mailbox array */
  StatusMailboxesMemory = slice_dma_loaf(DmaPages,
                StatusMailboxesSize, &StatusMailboxesMemoryDMA);

  Controller->V2.FirstStatusMailbox = StatusMailboxesMemory;
  Controller->V2.FirstStatusMailboxDMA = StatusMailboxesMemoryDMA;
  StatusMailboxesMemory += DAC960_V2_StatusMailboxCount - 1;
  Controller->V2.LastStatusMailbox = StatusMailboxesMemory;
  Controller->V2.NextStatusMailbox = Controller->V2.FirstStatusMailbox;

  Controller->V2.HealthStatusBuffer = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V2_HealthStatusBuffer_T),
                &Controller->V2.HealthStatusBufferDMA);

  Controller->V2.NewControllerInformation = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V2_ControllerInfo_T), 
                &Controller->V2.NewControllerInformationDMA);

  Controller->V2.NewLogicalDeviceInformation =  slice_dma_loaf(DmaPages,
                sizeof(DAC960_V2_LogicalDeviceInfo_T),
                &Controller->V2.NewLogicalDeviceInformationDMA);

  Controller->V2.NewPhysicalDeviceInformation = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V2_PhysicalDeviceInfo_T),
                &Controller->V2.NewPhysicalDeviceInformationDMA);

  Controller->V2.NewInquiryUnitSerialNumber = slice_dma_loaf(DmaPages,
                sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T),
                &Controller->V2.NewInquiryUnitSerialNumberDMA);

  Controller->V2.Event = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V2_Event_T),
                &Controller->V2.EventDMA);

  Controller->V2.PhysicalToLogicalDevice = slice_dma_loaf(DmaPages,
                sizeof(DAC960_V2_PhysicalToLogicalDevice_T),
                &Controller->V2.PhysicalToLogicalDeviceDMA);

  /*
    Enable the Memory Mailbox Interface.
    
    I don't know why we can't just use one of the memory mailboxes
    we just allocated to do this, instead of using this temporary one.
    Try this change later.
  */
  memset(CommandMailbox, 0, sizeof(DAC960_V2_CommandMailbox_T));
  CommandMailbox->SetMemoryMailbox.CommandIdentifier = 1;
  CommandMailbox->SetMemoryMailbox.CommandOpcode = DAC960_V2_IOCTL;
  CommandMailbox->SetMemoryMailbox.CommandControlBits.NoAutoRequestSense = true;
  CommandMailbox->SetMemoryMailbox.FirstCommandMailboxSizeKB =
    (DAC960_V2_CommandMailboxCount * sizeof(DAC960_V2_CommandMailbox_T)) >> 10;
  CommandMailbox->SetMemoryMailbox.FirstStatusMailboxSizeKB =
    (DAC960_V2_StatusMailboxCount * sizeof(DAC960_V2_StatusMailbox_T)) >> 10;
  CommandMailbox->SetMemoryMailbox.SecondCommandMailboxSizeKB = 0;
  CommandMailbox->SetMemoryMailbox.SecondStatusMailboxSizeKB = 0;
  CommandMailbox->SetMemoryMailbox.RequestSenseSize = 0;
  CommandMailbox->SetMemoryMailbox.IOCTL_Opcode = DAC960_V2_SetMemoryMailbox;
  CommandMailbox->SetMemoryMailbox.HealthStatusBufferSizeKB = 1;
  CommandMailbox->SetMemoryMailbox.HealthStatusBufferBusAddress =
                                        Controller->V2.HealthStatusBufferDMA;
  CommandMailbox->SetMemoryMailbox.FirstCommandMailboxBusAddress =
                                        Controller->V2.FirstCommandMailboxDMA;
  CommandMailbox->SetMemoryMailbox.FirstStatusMailboxBusAddress =
                                        Controller->V2.FirstStatusMailboxDMA;
  switch (Controller->HardwareType)
    {
    case DAC960_GEM_Controller:
      while (DAC960_GEM_HardwareMailboxFullP(ControllerBaseAddress))
        udelay(1);
      DAC960_GEM_WriteHardwareMailbox(ControllerBaseAddress, CommandMailboxDMA);
      DAC960_GEM_HardwareMailboxNewCommand(ControllerBaseAddress);
      while (!DAC960_GEM_HardwareMailboxStatusAvailableP(ControllerBaseAddress))
        udelay(1);
      CommandStatus = DAC960_GEM_ReadCommandStatus(ControllerBaseAddress);
      DAC960_GEM_AcknowledgeHardwareMailboxInterrupt(ControllerBaseAddress);
      DAC960_GEM_AcknowledgeHardwareMailboxStatus(ControllerBaseAddress);
      break;
    case DAC960_BA_Controller:
      while (DAC960_BA_HardwareMailboxFullP(ControllerBaseAddress))
        udelay(1);
      DAC960_BA_WriteHardwareMailbox(ControllerBaseAddress, CommandMailboxDMA);
      DAC960_BA_HardwareMailboxNewCommand(ControllerBaseAddress);
      while (!DAC960_BA_HardwareMailboxStatusAvailableP(ControllerBaseAddress))
        udelay(1);
      CommandStatus = DAC960_BA_ReadCommandStatus(ControllerBaseAddress);
      DAC960_BA_AcknowledgeHardwareMailboxInterrupt(ControllerBaseAddress);
      DAC960_BA_AcknowledgeHardwareMailboxStatus(ControllerBaseAddress);
      break;
    case DAC960_LP_Controller:
      while (DAC960_LP_HardwareMailboxFullP(ControllerBaseAddress))
        udelay(1);
      DAC960_LP_WriteHardwareMailbox(ControllerBaseAddress, CommandMailboxDMA);
      DAC960_LP_HardwareMailboxNewCommand(ControllerBaseAddress);
      while (!DAC960_LP_HardwareMailboxStatusAvailableP(ControllerBaseAddress))
        udelay(1);
      CommandStatus = DAC960_LP_ReadCommandStatus(ControllerBaseAddress);
      DAC960_LP_AcknowledgeHardwareMailboxInterrupt(ControllerBaseAddress);
      DAC960_LP_AcknowledgeHardwareMailboxStatus(ControllerBaseAddress);
      break;
    default:
      DAC960_Failure(Controller, "Unknown Controller Type\n");
      CommandStatus = DAC960_V2_AbormalCompletion;
      break;
    }
  pci_free_consistent(PCI_Device, sizeof(DAC960_V2_CommandMailbox_T),
                                        CommandMailbox, CommandMailboxDMA);
  return (CommandStatus == DAC960_V2_NormalCompletion);
}


/*
  DAC960_V1_ReadControllerConfiguration reads the Configuration Information
  from DAC960 V1 Firmware Controllers and initializes the Controller structure.
*/

static bool DAC960_V1_ReadControllerConfiguration(DAC960_Controller_T
                                                     *Controller)
{
  DAC960_V1_Enquiry2_T *Enquiry2;
  dma_addr_t Enquiry2DMA;
  DAC960_V1_Config2_T *Config2;
  dma_addr_t Config2DMA;
  int LogicalDriveNumber, Channel, TargetID;
  struct dma_loaf local_dma;

  if (!init_dma_loaf(Controller->PCIDevice, &local_dma,
                sizeof(DAC960_V1_Enquiry2_T) + sizeof(DAC960_V1_Config2_T)))
        return DAC960_Failure(Controller, "LOGICAL DEVICE ALLOCATION");

  Enquiry2 = slice_dma_loaf(&local_dma, sizeof(DAC960_V1_Enquiry2_T), &Enquiry2DMA);
  Config2 = slice_dma_loaf(&local_dma, sizeof(DAC960_V1_Config2_T), &Config2DMA);

  if (!DAC960_V1_ExecuteType3(Controller, DAC960_V1_Enquiry,
                              Controller->V1.NewEnquiryDMA)) {
    free_dma_loaf(Controller->PCIDevice, &local_dma);
    return DAC960_Failure(Controller, "ENQUIRY");
  }
  memcpy(&Controller->V1.Enquiry, Controller->V1.NewEnquiry,
                                                sizeof(DAC960_V1_Enquiry_T));

  if (!DAC960_V1_ExecuteType3(Controller, DAC960_V1_Enquiry2, Enquiry2DMA)) {
    free_dma_loaf(Controller->PCIDevice, &local_dma);
    return DAC960_Failure(Controller, "ENQUIRY2");
  }

  if (!DAC960_V1_ExecuteType3(Controller, DAC960_V1_ReadConfig2, Config2DMA)) {
    free_dma_loaf(Controller->PCIDevice, &local_dma);
    return DAC960_Failure(Controller, "READ CONFIG2");
  }

  if (!DAC960_V1_ExecuteType3(Controller, DAC960_V1_GetLogicalDriveInformation,
                              Controller->V1.NewLogicalDriveInformationDMA)) {
    free_dma_loaf(Controller->PCIDevice, &local_dma);
    return DAC960_Failure(Controller, "GET LOGICAL DRIVE INFORMATION");
  }
  memcpy(&Controller->V1.LogicalDriveInformation,
                Controller->V1.NewLogicalDriveInformation,
                sizeof(DAC960_V1_LogicalDriveInformationArray_T));

  for (Channel = 0; Channel < Enquiry2->ActualChannels; Channel++)
    for (TargetID = 0; TargetID < Enquiry2->MaxTargets; TargetID++) {
      if (!DAC960_V1_ExecuteType3D(Controller, DAC960_V1_GetDeviceState,
                                   Channel, TargetID,
                                   Controller->V1.NewDeviceStateDMA)) {
                free_dma_loaf(Controller->PCIDevice, &local_dma);
                return DAC960_Failure(Controller, "GET DEVICE STATE");
        }
        memcpy(&Controller->V1.DeviceState[Channel][TargetID],
                Controller->V1.NewDeviceState, sizeof(DAC960_V1_DeviceState_T));
     }
  /*
    Initialize the Controller Model Name and Full Model Name fields.
  */
  switch (Enquiry2->HardwareID.SubModel)
    {
    case DAC960_V1_P_PD_PU:
      if (Enquiry2->SCSICapability.BusSpeed == DAC960_V1_Ultra)
        strcpy(Controller->ModelName, "DAC960PU");
      else strcpy(Controller->ModelName, "DAC960PD");
      break;
    case DAC960_V1_PL:
      strcpy(Controller->ModelName, "DAC960PL");
      break;
    case DAC960_V1_PG:
      strcpy(Controller->ModelName, "DAC960PG");
      break;
    case DAC960_V1_PJ:
      strcpy(Controller->ModelName, "DAC960PJ");
      break;
    case DAC960_V1_PR:
      strcpy(Controller->ModelName, "DAC960PR");
      break;
    case DAC960_V1_PT:
      strcpy(Controller->ModelName, "DAC960PT");
      break;
    case DAC960_V1_PTL0:
      strcpy(Controller->ModelName, "DAC960PTL0");
      break;
    case DAC960_V1_PRL:
      strcpy(Controller->ModelName, "DAC960PRL");
      break;
    case DAC960_V1_PTL1:
      strcpy(Controller->ModelName, "DAC960PTL1");
      break;
    case DAC960_V1_1164P:
      strcpy(Controller->ModelName, "DAC1164P");
      break;
    default:
      free_dma_loaf(Controller->PCIDevice, &local_dma);
      return DAC960_Failure(Controller, "MODEL VERIFICATION");
    }
  strcpy(Controller->FullModelName, "Mylex ");
  strcat(Controller->FullModelName, Controller->ModelName);
  /*
    Initialize the Controller Firmware Version field and verify that it
    is a supported firmware version.  The supported firmware versions are:

    DAC1164P                5.06 and above
    DAC960PTL/PRL/PJ/PG     4.06 and above
    DAC960PU/PD/PL          3.51 and above
    DAC960PU/PD/PL/P        2.73 and above
  */
#if defined(CONFIG_ALPHA)
  /*
    DEC Alpha machines were often equipped with DAC960 cards that were
    OEMed from Mylex, and had their own custom firmware. Version 2.70,
    the last custom FW revision to be released by DEC for these older
    controllers, appears to work quite well with this driver.

    Cards tested successfully were several versions each of the PD and
    PU, called by DEC the KZPSC and KZPAC, respectively, and having
    the Manufacturer Numbers (from Mylex), usually on a sticker on the
    back of the board, of:

    KZPSC:  D040347 (1-channel) or D040348 (2-channel) or D040349 (3-channel)
    KZPAC:  D040395 (1-channel) or D040396 (2-channel) or D040397 (3-channel)
  */
# define FIRMWARE_27X   "2.70"
#else
# define FIRMWARE_27X   "2.73"
#endif

  if (Enquiry2->FirmwareID.MajorVersion == 0)
    {
      Enquiry2->FirmwareID.MajorVersion =
        Controller->V1.Enquiry.MajorFirmwareVersion;
      Enquiry2->FirmwareID.MinorVersion =
        Controller->V1.Enquiry.MinorFirmwareVersion;
      Enquiry2->FirmwareID.FirmwareType = '0';
      Enquiry2->FirmwareID.TurnID = 0;
    }
  sprintf(Controller->FirmwareVersion, "%d.%02d-%c-%02d",
          Enquiry2->FirmwareID.MajorVersion, Enquiry2->FirmwareID.MinorVersion,
          Enquiry2->FirmwareID.FirmwareType, Enquiry2->FirmwareID.TurnID);
  if (!((Controller->FirmwareVersion[0] == '5' &&
         strcmp(Controller->FirmwareVersion, "5.06") >= 0) ||
        (Controller->FirmwareVersion[0] == '4' &&
         strcmp(Controller->FirmwareVersion, "4.06") >= 0) ||
        (Controller->FirmwareVersion[0] == '3' &&
         strcmp(Controller->FirmwareVersion, "3.51") >= 0) ||
        (Controller->FirmwareVersion[0] == '2' &&
         strcmp(Controller->FirmwareVersion, FIRMWARE_27X) >= 0)))
    {
      DAC960_Failure(Controller, "FIRMWARE VERSION VERIFICATION");
      DAC960_Error("Firmware Version = '%s'\n", Controller,
                   Controller->FirmwareVersion);
      free_dma_loaf(Controller->PCIDevice, &local_dma);
      return false;
    }
  /*
    Initialize the Controller Channels, Targets, Memory Size, and SAF-TE
    Enclosure Management Enabled fields.
  */
  Controller->Channels = Enquiry2->ActualChannels;
  Controller->Targets = Enquiry2->MaxTargets;
  Controller->MemorySize = Enquiry2->MemorySize >> 20;
  Controller->V1.SAFTE_EnclosureManagementEnabled =
    (Enquiry2->FaultManagementType == DAC960_V1_SAFTE);
  /*
    Initialize the Controller Queue Depth, Driver Queue Depth, Logical Drive
    Count, Maximum Blocks per Command, Controller Scatter/Gather Limit, and
    Driver Scatter/Gather Limit.  The Driver Queue Depth must be at most one
    less than the Controller Queue Depth to allow for an automatic drive
    rebuild operation.
  */
  Controller->ControllerQueueDepth = Controller->V1.Enquiry.MaxCommands;
  Controller->DriverQueueDepth = Controller->ControllerQueueDepth - 1;
  if (Controller->DriverQueueDepth > DAC960_MaxDriverQueueDepth)
    Controller->DriverQueueDepth = DAC960_MaxDriverQueueDepth;
  Controller->LogicalDriveCount =
    Controller->V1.Enquiry.NumberOfLogicalDrives;
  Controller->MaxBlocksPerCommand = Enquiry2->MaxBlocksPerCommand;
  Controller->ControllerScatterGatherLimit = Enquiry2->MaxScatterGatherEntries;
  Controller->DriverScatterGatherLimit =
    Controller->ControllerScatterGatherLimit;
  if (Controller->DriverScatterGatherLimit > DAC960_V1_ScatterGatherLimit)
    Controller->DriverScatterGatherLimit = DAC960_V1_ScatterGatherLimit;
  /*
    Initialize the Stripe Size, Segment Size, and Geometry Translation.
  */
  Controller->V1.StripeSize = Config2->BlocksPerStripe * Config2->BlockFactor
                              >> (10 - DAC960_BlockSizeBits);
  Controller->V1.SegmentSize = Config2->BlocksPerCacheLine * Config2->BlockFactor
                               >> (10 - DAC960_BlockSizeBits);
  switch (Config2->DriveGeometry)
    {
    case DAC960_V1_Geometry_128_32:
      Controller->V1.GeometryTranslationHeads = 128;
      Controller->V1.GeometryTranslationSectors = 32;
      break;
    case DAC960_V1_Geometry_255_63:
      Controller->V1.GeometryTranslationHeads = 255;
      Controller->V1.GeometryTranslationSectors = 63;
      break;
    default:
      free_dma_loaf(Controller->PCIDevice, &local_dma);
      return DAC960_Failure(Controller, "CONFIG2 DRIVE GEOMETRY");
    }
  /*
    Initialize the Background Initialization Status.
  */
  if ((Controller->FirmwareVersion[0] == '4' &&
      strcmp(Controller->FirmwareVersion, "4.08") >= 0) ||
      (Controller->FirmwareVersion[0] == '5' &&
       strcmp(Controller->FirmwareVersion, "5.08") >= 0))
    {
      Controller->V1.BackgroundInitializationStatusSupported = true;
      DAC960_V1_ExecuteType3B(Controller,
                              DAC960_V1_BackgroundInitializationControl, 0x20,
                              Controller->
                               V1.BackgroundInitializationStatusDMA);
      memcpy(&Controller->V1.LastBackgroundInitializationStatus,
                Controller->V1.BackgroundInitializationStatus,
                sizeof(DAC960_V1_BackgroundInitializationStatus_T));
    }
  /*
    Initialize the Logical Drive Initially Accessible flag.
  */
  for (LogicalDriveNumber = 0;
       LogicalDriveNumber < Controller->LogicalDriveCount;
       LogicalDriveNumber++)
    if (Controller->V1.LogicalDriveInformation
                       [LogicalDriveNumber].LogicalDriveState !=
        DAC960_V1_LogicalDrive_Offline)
      Controller->LogicalDriveInitiallyAccessible[LogicalDriveNumber] = true;
  Controller->V1.LastRebuildStatus = DAC960_V1_NoRebuildOrCheckInProgress;
  free_dma_loaf(Controller->PCIDevice, &local_dma);
  return true;
}


/*
  DAC960_V2_ReadControllerConfiguration reads the Configuration Information
  from DAC960 V2 Firmware Controllers and initializes the Controller structure.
*/

static bool DAC960_V2_ReadControllerConfiguration(DAC960_Controller_T
                                                     *Controller)
{
  DAC960_V2_ControllerInfo_T *ControllerInfo =
                &Controller->V2.ControllerInformation;
  unsigned short LogicalDeviceNumber = 0;
  int ModelNameLength;

  /* Get data into dma-able area, then copy into permanant location */
  if (!DAC960_V2_NewControllerInfo(Controller))
    return DAC960_Failure(Controller, "GET CONTROLLER INFO");
  memcpy(ControllerInfo, Controller->V2.NewControllerInformation,
                        sizeof(DAC960_V2_ControllerInfo_T));
         
  
  if (!DAC960_V2_GeneralInfo(Controller))
    return DAC960_Failure(Controller, "GET HEALTH STATUS");

  /*
    Initialize the Controller Model Name and Full Model Name fields.
  */
  ModelNameLength = sizeof(ControllerInfo->ControllerName);
  if (ModelNameLength > sizeof(Controller->ModelName)-1)
    ModelNameLength = sizeof(Controller->ModelName)-1;
  memcpy(Controller->ModelName, ControllerInfo->ControllerName,
         ModelNameLength);
  ModelNameLength--;
  while (Controller->ModelName[ModelNameLength] == ' ' ||
         Controller->ModelName[ModelNameLength] == '\0')
    ModelNameLength--;
  Controller->ModelName[++ModelNameLength] = '\0';
  strcpy(Controller->FullModelName, "Mylex ");
  strcat(Controller->FullModelName, Controller->ModelName);
  /*
    Initialize the Controller Firmware Version field.
  */
  sprintf(Controller->FirmwareVersion, "%d.%02d-%02d",
          ControllerInfo->FirmwareMajorVersion,
          ControllerInfo->FirmwareMinorVersion,
          ControllerInfo->FirmwareTurnNumber);
  if (ControllerInfo->FirmwareMajorVersion == 6 &&
      ControllerInfo->FirmwareMinorVersion == 0 &&
      ControllerInfo->FirmwareTurnNumber < 1)
    {
      DAC960_Info("FIRMWARE VERSION %s DOES NOT PROVIDE THE CONTROLLER\n",
                  Controller, Controller->FirmwareVersion);
      DAC960_Info("STATUS MONITORING FUNCTIONALITY NEEDED BY THIS DRIVER.\n",
                  Controller);
      DAC960_Info("PLEASE UPGRADE TO VERSION 6.00-01 OR ABOVE.\n",
                  Controller);
    }
  /*
    Initialize the Controller Channels, Targets, and Memory Size.
  */
  Controller->Channels = ControllerInfo->NumberOfPhysicalChannelsPresent;
  Controller->Targets =
    ControllerInfo->MaximumTargetsPerChannel
                    [ControllerInfo->NumberOfPhysicalChannelsPresent-1];
  Controller->MemorySize = ControllerInfo->MemorySizeMB;
  /*
    Initialize the Controller Queue Depth, Driver Queue Depth, Logical Drive
    Count, Maximum Blocks per Command, Controller Scatter/Gather Limit, and
    Driver Scatter/Gather Limit.  The Driver Queue Depth must be at most one
    less than the Controller Queue Depth to allow for an automatic drive
    rebuild operation.
  */
  Controller->ControllerQueueDepth = ControllerInfo->MaximumParallelCommands;
  Controller->DriverQueueDepth = Controller->ControllerQueueDepth - 1;
  if (Controller->DriverQueueDepth > DAC960_MaxDriverQueueDepth)
    Controller->DriverQueueDepth = DAC960_MaxDriverQueueDepth;
  Controller->LogicalDriveCount = ControllerInfo->LogicalDevicesPresent;
  Controller->MaxBlocksPerCommand =
    ControllerInfo->MaximumDataTransferSizeInBlocks;
  Controller->ControllerScatterGatherLimit =
    ControllerInfo->MaximumScatterGatherEntries;
  Controller->DriverScatterGatherLimit =
    Controller->ControllerScatterGatherLimit;
  if (Controller->DriverScatterGatherLimit > DAC960_V2_ScatterGatherLimit)
    Controller->DriverScatterGatherLimit = DAC960_V2_ScatterGatherLimit;
  /*
    Initialize the Logical Device Information.
  */
  while (true)
    {
      DAC960_V2_LogicalDeviceInfo_T *NewLogicalDeviceInfo =
        Controller->V2.NewLogicalDeviceInformation;
      DAC960_V2_LogicalDeviceInfo_T *LogicalDeviceInfo;
      DAC960_V2_PhysicalDevice_T PhysicalDevice;

      if (!DAC960_V2_NewLogicalDeviceInfo(Controller, LogicalDeviceNumber))
        break;
      LogicalDeviceNumber = NewLogicalDeviceInfo->LogicalDeviceNumber;
      if (LogicalDeviceNumber >= DAC960_MaxLogicalDrives) {
        DAC960_Error("DAC960: Logical Drive Number %d not supported\n",
                       Controller, LogicalDeviceNumber);
                break;
      }
      if (NewLogicalDeviceInfo->DeviceBlockSizeInBytes != DAC960_BlockSize) {
        DAC960_Error("DAC960: Logical Drive Block Size %d not supported\n",
              Controller, NewLogicalDeviceInfo->DeviceBlockSizeInBytes);
        LogicalDeviceNumber++;
        continue;
      }
      PhysicalDevice.Controller = 0;
      PhysicalDevice.Channel = NewLogicalDeviceInfo->Channel;
      PhysicalDevice.TargetID = NewLogicalDeviceInfo->TargetID;
      PhysicalDevice.LogicalUnit = NewLogicalDeviceInfo->LogicalUnit;
      Controller->V2.LogicalDriveToVirtualDevice[LogicalDeviceNumber] =
        PhysicalDevice;
      if (NewLogicalDeviceInfo->LogicalDeviceState !=
          DAC960_V2_LogicalDevice_Offline)
        Controller->LogicalDriveInitiallyAccessible[LogicalDeviceNumber] = true;
      LogicalDeviceInfo = kmalloc(sizeof(DAC960_V2_LogicalDeviceInfo_T),
                                   GFP_ATOMIC);
      if (LogicalDeviceInfo == NULL)
        return DAC960_Failure(Controller, "LOGICAL DEVICE ALLOCATION");
      Controller->V2.LogicalDeviceInformation[LogicalDeviceNumber] =
        LogicalDeviceInfo;
      memcpy(LogicalDeviceInfo, NewLogicalDeviceInfo,
             sizeof(DAC960_V2_LogicalDeviceInfo_T));
      LogicalDeviceNumber++;
    }
  return true;
}


/*
  DAC960_ReportControllerConfiguration reports the Configuration Information
  for Controller.
*/

static bool DAC960_ReportControllerConfiguration(DAC960_Controller_T
                                                    *Controller)
{
  DAC960_Info("Configuring Mylex %s PCI RAID Controller\n",
              Controller, Controller->ModelName);
  DAC960_Info("  Firmware Version: %s, Channels: %d, Memory Size: %dMB\n",
              Controller, Controller->FirmwareVersion,
              Controller->Channels, Controller->MemorySize);
  DAC960_Info("  PCI Bus: %d, Device: %d, Function: %d, I/O Address: ",
              Controller, Controller->Bus,
              Controller->Device, Controller->Function);
  if (Controller->IO_Address == 0)
    DAC960_Info("Unassigned\n", Controller);
  else DAC960_Info("0x%X\n", Controller, Controller->IO_Address);
  DAC960_Info("  PCI Address: 0x%X mapped at 0x%lX, IRQ Channel: %d\n",
              Controller, Controller->PCI_Address,
              (unsigned long) Controller->BaseAddress,
              Controller->IRQ_Channel);
  DAC960_Info("  Controller Queue Depth: %d, "
              "Maximum Blocks per Command: %d\n",
              Controller, Controller->ControllerQueueDepth,
              Controller->MaxBlocksPerCommand);
  DAC960_Info("  Driver Queue Depth: %d, "
              "Scatter/Gather Limit: %d of %d Segments\n",
              Controller, Controller->DriverQueueDepth,
              Controller->DriverScatterGatherLimit,
              Controller->ControllerScatterGatherLimit);
  if (Controller->FirmwareType == DAC960_V1_Controller)
    {
      DAC960_Info("  Stripe Size: %dKB, Segment Size: %dKB, "
                  "BIOS Geometry: %d/%d\n", Controller,
                  Controller->V1.StripeSize,
                  Controller->V1.SegmentSize,
                  Controller->V1.GeometryTranslationHeads,
                  Controller->V1.GeometryTranslationSectors);
      if (Controller->V1.SAFTE_EnclosureManagementEnabled)
        DAC960_Info("  SAF-TE Enclosure Management Enabled\n", Controller);
    }
  return true;
}


/*
  DAC960_V1_ReadDeviceConfiguration reads the Device Configuration Information
  for DAC960 V1 Firmware Controllers by requesting the SCSI Inquiry and SCSI
  Inquiry Unit Serial Number information for each device connected to
  Controller.
*/

static bool DAC960_V1_ReadDeviceConfiguration(DAC960_Controller_T
                                                 *Controller)
{
  struct dma_loaf local_dma;

  dma_addr_t DCDBs_dma[DAC960_V1_MaxChannels];
  DAC960_V1_DCDB_T *DCDBs_cpu[DAC960_V1_MaxChannels];

  dma_addr_t SCSI_Inquiry_dma[DAC960_V1_MaxChannels];
  DAC960_SCSI_Inquiry_T *SCSI_Inquiry_cpu[DAC960_V1_MaxChannels];

  dma_addr_t SCSI_NewInquiryUnitSerialNumberDMA[DAC960_V1_MaxChannels];
  DAC960_SCSI_Inquiry_UnitSerialNumber_T *SCSI_NewInquiryUnitSerialNumberCPU[DAC960_V1_MaxChannels];

  struct completion Completions[DAC960_V1_MaxChannels];
  unsigned long flags;
  int Channel, TargetID;

  if (!init_dma_loaf(Controller->PCIDevice, &local_dma, 
                DAC960_V1_MaxChannels*(sizeof(DAC960_V1_DCDB_T) +
                        sizeof(DAC960_SCSI_Inquiry_T) +
                        sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T))))
     return DAC960_Failure(Controller,
                        "DMA ALLOCATION FAILED IN ReadDeviceConfiguration"); 
   
  for (Channel = 0; Channel < Controller->Channels; Channel++) {
        DCDBs_cpu[Channel] = slice_dma_loaf(&local_dma,
                        sizeof(DAC960_V1_DCDB_T), DCDBs_dma + Channel);
        SCSI_Inquiry_cpu[Channel] = slice_dma_loaf(&local_dma,
                        sizeof(DAC960_SCSI_Inquiry_T),
                        SCSI_Inquiry_dma + Channel);
        SCSI_NewInquiryUnitSerialNumberCPU[Channel] = slice_dma_loaf(&local_dma,
                        sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T),
                        SCSI_NewInquiryUnitSerialNumberDMA + Channel);
  }
                
  for (TargetID = 0; TargetID < Controller->Targets; TargetID++)
    {
      /*
       * For each channel, submit a probe for a device on that channel.
       * The timeout interval for a device that is present is 10 seconds.
       * With this approach, the timeout periods can elapse in parallel
       * on each channel.

       */
      for (Channel = 0; Channel < Controller->Channels; Channel++)
        {
          dma_addr_t NewInquiryStandardDataDMA = SCSI_Inquiry_dma[Channel];
          DAC960_V1_DCDB_T *DCDB = DCDBs_cpu[Channel];
          dma_addr_t DCDB_dma = DCDBs_dma[Channel];
          DAC960_Command_T *Command = Controller->Commands[Channel];
          struct completion *Completion = &Completions[Channel];

          init_completion(Completion);
          DAC960_V1_ClearCommand(Command);
          Command->CommandType = DAC960_ImmediateCommand;
          Command->Completion = Completion;
          Command->V1.CommandMailbox.Type3.CommandOpcode = DAC960_V1_DCDB;
          Command->V1.CommandMailbox.Type3.BusAddress = DCDB_dma;
          DCDB->Channel = Channel;
          DCDB->TargetID = TargetID;
          DCDB->Direction = DAC960_V1_DCDB_DataTransferDeviceToSystem;
          DCDB->EarlyStatus = false;
          DCDB->Timeout = DAC960_V1_DCDB_Timeout_10_seconds;
          DCDB->NoAutomaticRequestSense = false;
          DCDB->DisconnectPermitted = true;
          DCDB->TransferLength = sizeof(DAC960_SCSI_Inquiry_T);
          DCDB->BusAddress = NewInquiryStandardDataDMA;
          DCDB->CDBLength = 6;
          DCDB->TransferLengthHigh4 = 0;
          DCDB->SenseLength = sizeof(DCDB->SenseData);
          DCDB->CDB[0] = 0x12; /* INQUIRY */
          DCDB->CDB[1] = 0; /* EVPD = 0 */
          DCDB->CDB[2] = 0; /* Page Code */
          DCDB->CDB[3] = 0; /* Reserved */
          DCDB->CDB[4] = sizeof(DAC960_SCSI_Inquiry_T);
          DCDB->CDB[5] = 0; /* Control */

          spin_lock_irqsave(&Controller->queue_lock, flags);
          DAC960_QueueCommand(Command);
          spin_unlock_irqrestore(&Controller->queue_lock, flags);
        }
      /*
       * Wait for the problems submitted in the previous loop
       * to complete.  On the probes that are successful, 
       * get the serial number of the device that was found.
       */
      for (Channel = 0; Channel < Controller->Channels; Channel++)
        {
          DAC960_SCSI_Inquiry_T *InquiryStandardData =
            &Controller->V1.InquiryStandardData[Channel][TargetID];
          DAC960_SCSI_Inquiry_T *NewInquiryStandardData = SCSI_Inquiry_cpu[Channel];
          dma_addr_t NewInquiryUnitSerialNumberDMA =
                        SCSI_NewInquiryUnitSerialNumberDMA[Channel];
          DAC960_SCSI_Inquiry_UnitSerialNumber_T *NewInquiryUnitSerialNumber =
                        SCSI_NewInquiryUnitSerialNumberCPU[Channel];
          DAC960_SCSI_Inquiry_UnitSerialNumber_T *InquiryUnitSerialNumber =
            &Controller->V1.InquiryUnitSerialNumber[Channel][TargetID];
          DAC960_Command_T *Command = Controller->Commands[Channel];
          DAC960_V1_DCDB_T *DCDB = DCDBs_cpu[Channel];
          struct completion *Completion = &Completions[Channel];

          wait_for_completion(Completion);

          if (Command->V1.CommandStatus != DAC960_V1_NormalCompletion) {
            memset(InquiryStandardData, 0, sizeof(DAC960_SCSI_Inquiry_T));
            InquiryStandardData->PeripheralDeviceType = 0x1F;
            continue;
          } else
            memcpy(InquiryStandardData, NewInquiryStandardData, sizeof(DAC960_SCSI_Inquiry_T));
        
          /* Preserve Channel and TargetID values from the previous loop */
          Command->Completion = Completion;
          DCDB->TransferLength = sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T);
          DCDB->BusAddress = NewInquiryUnitSerialNumberDMA;
          DCDB->SenseLength = sizeof(DCDB->SenseData);
          DCDB->CDB[0] = 0x12; /* INQUIRY */
          DCDB->CDB[1] = 1; /* EVPD = 1 */
          DCDB->CDB[2] = 0x80; /* Page Code */
          DCDB->CDB[3] = 0; /* Reserved */
          DCDB->CDB[4] = sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T);
          DCDB->CDB[5] = 0; /* Control */

          spin_lock_irqsave(&Controller->queue_lock, flags);
          DAC960_QueueCommand(Command);
          spin_unlock_irqrestore(&Controller->queue_lock, flags);
          wait_for_completion(Completion);

          if (Command->V1.CommandStatus != DAC960_V1_NormalCompletion) {
                memset(InquiryUnitSerialNumber, 0,
                        sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T));
                InquiryUnitSerialNumber->PeripheralDeviceType = 0x1F;
          } else
                memcpy(InquiryUnitSerialNumber, NewInquiryUnitSerialNumber,
                        sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T));
        }
    }
    free_dma_loaf(Controller->PCIDevice, &local_dma);
  return true;
}


/*
  DAC960_V2_ReadDeviceConfiguration reads the Device Configuration Information
  for DAC960 V2 Firmware Controllers by requesting the Physical Device
  Information and SCSI Inquiry Unit Serial Number information for each
  device connected to Controller.
*/

static bool DAC960_V2_ReadDeviceConfiguration(DAC960_Controller_T
                                                 *Controller)
{
  unsigned char Channel = 0, TargetID = 0, LogicalUnit = 0;
  unsigned short PhysicalDeviceIndex = 0;

  while (true)
    {
      DAC960_V2_PhysicalDeviceInfo_T *NewPhysicalDeviceInfo =
                Controller->V2.NewPhysicalDeviceInformation;
      DAC960_V2_PhysicalDeviceInfo_T *PhysicalDeviceInfo;
      DAC960_SCSI_Inquiry_UnitSerialNumber_T *NewInquiryUnitSerialNumber =
                Controller->V2.NewInquiryUnitSerialNumber;
      DAC960_SCSI_Inquiry_UnitSerialNumber_T *InquiryUnitSerialNumber;

      if (!DAC960_V2_NewPhysicalDeviceInfo(Controller, Channel, TargetID, LogicalUnit))
          break;

      PhysicalDeviceInfo = kmalloc(sizeof(DAC960_V2_PhysicalDeviceInfo_T),
                                    GFP_ATOMIC);
      if (PhysicalDeviceInfo == NULL)
                return DAC960_Failure(Controller, "PHYSICAL DEVICE ALLOCATION");
      Controller->V2.PhysicalDeviceInformation[PhysicalDeviceIndex] =
                PhysicalDeviceInfo;
      memcpy(PhysicalDeviceInfo, NewPhysicalDeviceInfo,
                sizeof(DAC960_V2_PhysicalDeviceInfo_T));

      InquiryUnitSerialNumber = kmalloc(
              sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T), GFP_ATOMIC);
      if (InquiryUnitSerialNumber == NULL) {
        kfree(PhysicalDeviceInfo);
        return DAC960_Failure(Controller, "SERIAL NUMBER ALLOCATION");
      }
      Controller->V2.InquiryUnitSerialNumber[PhysicalDeviceIndex] =
                InquiryUnitSerialNumber;

      Channel = NewPhysicalDeviceInfo->Channel;
      TargetID = NewPhysicalDeviceInfo->TargetID;
      LogicalUnit = NewPhysicalDeviceInfo->LogicalUnit;

      /*
         Some devices do NOT have Unit Serial Numbers.
         This command fails for them.  But, we still want to
         remember those devices are there.  Construct a
         UnitSerialNumber structure for the failure case.
      */
      if (!DAC960_V2_NewInquiryUnitSerialNumber(Controller, Channel, TargetID, LogicalUnit)) {
        memset(InquiryUnitSerialNumber, 0,
             sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T));
        InquiryUnitSerialNumber->PeripheralDeviceType = 0x1F;
      } else
        memcpy(InquiryUnitSerialNumber, NewInquiryUnitSerialNumber,
                sizeof(DAC960_SCSI_Inquiry_UnitSerialNumber_T));

      PhysicalDeviceIndex++;
      LogicalUnit++;
    }
  return true;
}


/*
  DAC960_SanitizeInquiryData sanitizes the Vendor, Model, Revision, and
  Product Serial Number fields of the Inquiry Standard Data and Inquiry
  Unit Serial Number structures.
*/

static void DAC960_SanitizeInquiryData(DAC960_SCSI_Inquiry_T
                                         *InquiryStandardData,
                                       DAC960_SCSI_Inquiry_UnitSerialNumber_T
                                         *InquiryUnitSerialNumber,
                                       unsigned char *Vendor,
                                       unsigned char *Model,
                                       unsigned char *Revision,
                                       unsigned char *SerialNumber)
{
  int SerialNumberLength, i;
  if (InquiryStandardData->PeripheralDeviceType == 0x1F) return;
  for (i = 0; i < sizeof(InquiryStandardData->VendorIdentification); i++)
    {
      unsigned char VendorCharacter =
        InquiryStandardData->VendorIdentification[i];
      Vendor[i] = (VendorCharacter >= ' ' && VendorCharacter <= '~'
                   ? VendorCharacter : ' ');
    }
  Vendor[sizeof(InquiryStandardData->VendorIdentification)] = '\0';
  for (i = 0; i < sizeof(InquiryStandardData->ProductIdentification); i++)
    {
      unsigned char ModelCharacter =
        InquiryStandardData->ProductIdentification[i];
      Model[i] = (ModelCharacter >= ' ' && ModelCharacter <= '~'
                  ? ModelCharacter : ' ');
    }
  Model[sizeof(InquiryStandardData->ProductIdentification)] = '\0';
  for (i = 0; i < sizeof(InquiryStandardData->ProductRevisionLevel); i++)
    {
      unsigned char RevisionCharacter =
        InquiryStandardData->ProductRevisionLevel[i];
      Revision[i] = (RevisionCharacter >= ' ' && RevisionCharacter <= '~'
                     ? RevisionCharacter : ' ');
    }
  Revision[sizeof(InquiryStandardData->ProductRevisionLevel)] = '\0';
  if (InquiryUnitSerialNumber->PeripheralDeviceType == 0x1F) return;
  SerialNumberLength = InquiryUnitSerialNumber->PageLength;
  if (SerialNumberLength >
      sizeof(InquiryUnitSerialNumber->ProductSerialNumber))
    SerialNumberLength = sizeof(InquiryUnitSerialNumber->ProductSerialNumber);
  for (i = 0; i < SerialNumberLength; i++)
    {
      unsigned char SerialNumberCharacter =
        InquiryUnitSerialNumber->ProductSerialNumber[i];
      SerialNumber[i] =
        (SerialNumberCharacter >= ' ' && SerialNumberCharacter <= '~'
         ? SerialNumberCharacter : ' ');
    }
  SerialNumber[SerialNumberLength] = '\0';
}


/*
  DAC960_V1_ReportDeviceConfiguration reports the Device Configuration
  Information for DAC960 V1 Firmware Controllers.
*/

static bool DAC960_V1_ReportDeviceConfiguration(DAC960_Controller_T
                                                   *Controller)
{
  int LogicalDriveNumber, Channel, TargetID;
  DAC960_Info("  Physical Devices:\n", Controller);
  for (Channel = 0; Channel < Controller->Channels; Channel++)
    for (TargetID = 0; TargetID < Controller->Targets; TargetID++)
      {
        DAC960_SCSI_Inquiry_T *InquiryStandardData =
          &Controller->V1.InquiryStandardData[Channel][TargetID];
        DAC960_SCSI_Inquiry_UnitSerialNumber_T *InquiryUnitSerialNumber =
          &Controller->V1.InquiryUnitSerialNumber[Channel][TargetID];
        DAC960_V1_DeviceState_T *DeviceState =
          &Controller->V1.DeviceState[Channel][TargetID];
        DAC960_V1_ErrorTableEntry_T *ErrorEntry =
          &Controller->V1.ErrorTable.ErrorTableEntries[Channel][TargetID];
        char Vendor[1+sizeof(InquiryStandardData->VendorIdentification)];
        char Model[1+sizeof(InquiryStandardData->ProductIdentification)];
        char Revision[1+sizeof(InquiryStandardData->ProductRevisionLevel)];
        char SerialNumber[1+sizeof(InquiryUnitSerialNumber
                                   ->ProductSerialNumber)];
        if (InquiryStandardData->PeripheralDeviceType == 0x1F) continue;
        DAC960_SanitizeInquiryData(InquiryStandardData, InquiryUnitSerialNumber,
                                   Vendor, Model, Revision, SerialNumber);
        DAC960_Info("    %d:%d%s Vendor: %s  Model: %s  Revision: %s\n",
                    Controller, Channel, TargetID, (TargetID < 10 ? " " : ""),
                    Vendor, Model, Revision);
        if (InquiryUnitSerialNumber->PeripheralDeviceType != 0x1F)
          DAC960_Info("         Serial Number: %s\n", Controller, SerialNumber);
        if (DeviceState->Present &&
            DeviceState->DeviceType == DAC960_V1_DiskType)
          {
            if (Controller->V1.DeviceResetCount[Channel][TargetID] > 0)
              DAC960_Info("         Disk Status: %s, %u blocks, %d resets\n",
                          Controller,
                          (DeviceState->DeviceState == DAC960_V1_Device_Dead
                           ? "Dead"
                           : DeviceState->DeviceState
                             == DAC960_V1_Device_WriteOnly
                             ? "Write-Only"
                             : DeviceState->DeviceState
                               == DAC960_V1_Device_Online
                               ? "Online" : "Standby"),
                          DeviceState->DiskSize,
                          Controller->V1.DeviceResetCount[Channel][TargetID]);
            else
              DAC960_Info("         Disk Status: %s, %u blocks\n", Controller,
                          (DeviceState->DeviceState == DAC960_V1_Device_Dead
                           ? "Dead"
                           : DeviceState->DeviceState
                             == DAC960_V1_Device_WriteOnly
                             ? "Write-Only"
                             : DeviceState->DeviceState
                               == DAC960_V1_Device_Online
                               ? "Online" : "Standby"),
                          DeviceState->DiskSize);
          }
        if (ErrorEntry->ParityErrorCount > 0 ||
            ErrorEntry->SoftErrorCount > 0 ||
            ErrorEntry->HardErrorCount > 0 ||
            ErrorEntry->MiscErrorCount > 0)
          DAC960_Info("         Errors - Parity: %d, Soft: %d, "
                      "Hard: %d, Misc: %d\n", Controller,
                      ErrorEntry->ParityErrorCount,
                      ErrorEntry->SoftErrorCount,
                      ErrorEntry->HardErrorCount,
                      ErrorEntry->MiscErrorCount);
      }
  DAC960_Info("  Logical Drives:\n", Controller);
  for (LogicalDriveNumber = 0;
       LogicalDriveNumber < Controller->LogicalDriveCount;
       LogicalDriveNumber++)
    {
      DAC960_V1_LogicalDriveInformation_T *LogicalDriveInformation =
        &Controller->V1.LogicalDriveInformation[LogicalDriveNumber];
      DAC960_Info("    /dev/rd/c%dd%d: RAID-%d, %s, %u blocks, %s\n",
                  Controller, Controller->ControllerNumber, LogicalDriveNumber,
                  LogicalDriveInformation->RAIDLevel,
                  (LogicalDriveInformation->LogicalDriveState
                   == DAC960_V1_LogicalDrive_Online
                   ? "Online"
                   : LogicalDriveInformation->LogicalDriveState
                     == DAC960_V1_LogicalDrive_Critical
                     ? "Critical" : "Offline"),
                  LogicalDriveInformation->LogicalDriveSize,
                  (LogicalDriveInformation->WriteBack
                   ? "Write Back" : "Write Thru"));
    }
  return true;
}


/*
  DAC960_V2_ReportDeviceConfiguration reports the Device Configuration
  Information for DAC960 V2 Firmware Controllers.
*/

static bool DAC960_V2_ReportDeviceConfiguration(DAC960_Controller_T
                                                   *Controller)
{
  int PhysicalDeviceIndex, LogicalDriveNumber;
  DAC960_Info("  Physical Devices:\n", Controller);
  for (PhysicalDeviceIndex = 0;
       PhysicalDeviceIndex < DAC960_V2_MaxPhysicalDevices;
       PhysicalDeviceIndex++)
    {
      DAC960_V2_PhysicalDeviceInfo_T *PhysicalDeviceInfo =
        Controller->V2.PhysicalDeviceInformation[PhysicalDeviceIndex];
      DAC960_SCSI_Inquiry_T *InquiryStandardData =
        (DAC960_SCSI_Inquiry_T *) &PhysicalDeviceInfo->SCSI_InquiryData;
      DAC960_SCSI_Inquiry_UnitSerialNumber_T *InquiryUnitSerialNumber =
        Controller->V2.InquiryUnitSerialNumber[PhysicalDeviceIndex];
      char Vendor[1+sizeof(InquiryStandardData->VendorIdentification)];
      char Model[1+sizeof(InquiryStandardData->ProductIdentification)];
      char Revision[1+sizeof(InquiryStandardData->ProductRevisionLevel)];
      char SerialNumber[1+sizeof(InquiryUnitSerialNumber->ProductSerialNumber)];
      if (PhysicalDeviceInfo == NULL) break;
      DAC960_SanitizeInquiryData(InquiryStandardData, InquiryUnitSerialNumber,
                                 Vendor, Model, Revision, SerialNumber);
      DAC960_Info("    %d:%d%s Vendor: %s  Model: %s  Revision: %s\n",
                  Controller,
                  PhysicalDeviceInfo->Channel,
                  PhysicalDeviceInfo->TargetID,
                  (PhysicalDeviceInfo->TargetID < 10 ? " " : ""),
                  Vendor, Model, Revision);
      if (PhysicalDeviceInfo->NegotiatedSynchronousMegaTransfers == 0)
        DAC960_Info("         %sAsynchronous\n", Controller,
                    (PhysicalDeviceInfo->NegotiatedDataWidthBits == 16
                     ? "Wide " :""));
      else
        DAC960_Info("         %sSynchronous at %d MB/sec\n", Controller,
                    (PhysicalDeviceInfo->NegotiatedDataWidthBits == 16
                     ? "Wide " :""),
                    (PhysicalDeviceInfo->NegotiatedSynchronousMegaTransfers
                     * PhysicalDeviceInfo->NegotiatedDataWidthBits/8));
      if (InquiryUnitSerialNumber->PeripheralDeviceType != 0x1F)
        DAC960_Info("         Serial Number: %s\n", Controller, SerialNumber);
      if (PhysicalDeviceInfo->PhysicalDeviceState ==
          DAC960_V2_Device_Unconfigured)
        continue;
      DAC960_Info("         Disk Status: %s, %u blocks\n", Controller,
                  (PhysicalDeviceInfo->PhysicalDeviceState
                   == DAC960_V2_Device_Online
                   ? "Online"
                   : PhysicalDeviceInfo->PhysicalDeviceState
                     == DAC960_V2_Device_Rebuild
                     ? "Rebuild"
                     : PhysicalDeviceInfo->PhysicalDeviceState
                       == DAC960_V2_Device_Missing
                       ? "Missing"
                       : PhysicalDeviceInfo->PhysicalDeviceState
                         == DAC960_V2_Device_Critical
                         ? "Critical"
                         : PhysicalDeviceInfo->PhysicalDeviceState
                           == DAC960_V2_Device_Dead
                           ? "Dead"
                           : PhysicalDeviceInfo->PhysicalDeviceState
                             == DAC960_V2_Device_SuspectedDead
                             ? "Suspected-Dead"
                             : PhysicalDeviceInfo->PhysicalDeviceState
                               == DAC960_V2_Device_CommandedOffline
                               ? "Commanded-Offline"
                               : PhysicalDeviceInfo->PhysicalDeviceState
                                 == DAC960_V2_Device_Standby
                                 ? "Standby" : "Unknown"),
                  PhysicalDeviceInfo->ConfigurableDeviceSize);
      if (PhysicalDeviceInfo->ParityErrors == 0 &&
          PhysicalDeviceInfo->SoftErrors == 0 &&
          PhysicalDeviceInfo->HardErrors == 0 &&
          PhysicalDeviceInfo->MiscellaneousErrors == 0 &&
          PhysicalDeviceInfo->CommandTimeouts == 0 &&
          PhysicalDeviceInfo->Retries == 0 &&
          PhysicalDeviceInfo->Aborts == 0 &&
          PhysicalDeviceInfo->PredictedFailuresDetected == 0)
        continue;
      DAC960_Info("         Errors - Parity: %d, Soft: %d, "
                  "Hard: %d, Misc: %d\n", Controller,
                  PhysicalDeviceInfo->ParityErrors,
                  PhysicalDeviceInfo->SoftErrors,
                  PhysicalDeviceInfo->HardErrors,
                  PhysicalDeviceInfo->MiscellaneousErrors);
      DAC960_Info("                  Timeouts: %d, Retries: %d, "
                  "Aborts: %d, Predicted: %d\n", Controller,
                  PhysicalDeviceInfo->CommandTimeouts,
                  PhysicalDeviceInfo->Retries,
                  PhysicalDeviceInfo->Aborts,
                  PhysicalDeviceInfo->PredictedFailuresDetected);
    }
  DAC960_Info("  Logical Drives:\n", Controller);
  for (LogicalDriveNumber = 0;
       LogicalDriveNumber < DAC960_MaxLogicalDrives;
       LogicalDriveNumber++)
    {
      DAC960_V2_LogicalDeviceInfo_T *LogicalDeviceInfo =
        Controller->V2.LogicalDeviceInformation[LogicalDriveNumber];
      unsigned char *ReadCacheStatus[] = { "Read Cache Disabled",
                                           "Read Cache Enabled",
                                           "Read Ahead Enabled",
                                           "Intelligent Read Ahead Enabled",
                                           "-", "-", "-", "-" };
      unsigned char *WriteCacheStatus[] = { "Write Cache Disabled",
                                            "Logical Device Read Only",
                                            "Write Cache Enabled",
                                            "Intelligent Write Cache Enabled",
                                            "-", "-", "-", "-" };
      unsigned char *GeometryTranslation;
      if (LogicalDeviceInfo == NULL) continue;
      switch (LogicalDeviceInfo->DriveGeometry)
        {
        case DAC960_V2_Geometry_128_32:
          GeometryTranslation = "128/32";
          break;
        case DAC960_V2_Geometry_255_63:
          GeometryTranslation = "255/63";
          break;
        default:
          GeometryTranslation = "Invalid";
          DAC960_Error("Illegal Logical Device Geometry %d\n",
                       Controller, LogicalDeviceInfo->DriveGeometry);
          break;
        }
      DAC960_Info("    /dev/rd/c%dd%d: RAID-%d, %s, %u blocks\n",
                  Controller, Controller->ControllerNumber, LogicalDriveNumber,
                  LogicalDeviceInfo->RAIDLevel,
                  (LogicalDeviceInfo->LogicalDeviceState
                   == DAC960_V2_LogicalDevice_Online
                   ? "Online"
                   : LogicalDeviceInfo->LogicalDeviceState
                     == DAC960_V2_LogicalDevice_Critical
                     ? "Critical" : "Offline"),
                  LogicalDeviceInfo->ConfigurableDeviceSize);
      DAC960_Info("                  Logical Device %s, BIOS Geometry: %s\n",
                  Controller,
                  (LogicalDeviceInfo->LogicalDeviceControl
                                     .LogicalDeviceInitialized
                   ? "Initialized" : "Uninitialized"),
                  GeometryTranslation);
      if (LogicalDeviceInfo->StripeSize == 0)
        {
          if (LogicalDeviceInfo->CacheLineSize == 0)
            DAC960_Info("                  Stripe Size: N/A, "
                        "Segment Size: N/A\n", Controller);
          else
            DAC960_Info("                  Stripe Size: N/A, "
                        "Segment Size: %dKB\n", Controller,
                        1 << (LogicalDeviceInfo->CacheLineSize - 2));
        }
      else
        {
          if (LogicalDeviceInfo->CacheLineSize == 0)
            DAC960_Info("                  Stripe Size: %dKB, "
                        "Segment Size: N/A\n", Controller,
                        1 << (LogicalDeviceInfo->StripeSize - 2));
          else
            DAC960_Info("                  Stripe Size: %dKB, "
                        "Segment Size: %dKB\n", Controller,
                        1 << (LogicalDeviceInfo->StripeSize - 2),
                        1 << (LogicalDeviceInfo->CacheLineSize - 2));
        }
      DAC960_Info("                  %s, %s\n", Controller,
                  ReadCacheStatus[
                    LogicalDeviceInfo->LogicalDeviceControl.ReadCache],
                  WriteCacheStatus[
                    LogicalDeviceInfo->LogicalDeviceControl.WriteCache]);
      if (LogicalDeviceInfo->SoftErrors > 0 ||
          LogicalDeviceInfo->CommandsFailed > 0 ||
          LogicalDeviceInfo->DeferredWriteErrors)
        DAC960_Info("                  Errors - Soft: %d, Failed: %d, "
                    "Deferred Write: %d\n", Controller,
                    LogicalDeviceInfo->SoftErrors,
                    LogicalDeviceInfo->CommandsFailed,
                    LogicalDeviceInfo->DeferredWriteErrors);

    }
  return true;
}

/*
  DAC960_RegisterBlockDevice registers the Block Device structures
  associated with Controller.
*/

static bool DAC960_RegisterBlockDevice(DAC960_Controller_T *Controller)
{
  int MajorNumber = DAC960_MAJOR + Controller->ControllerNumber;
  int n;

  /*
    Register the Block Device Major Number for this DAC960 Controller.
  */
  if (register_blkdev(MajorNumber, "dac960") < 0)
      return false;

  for (n = 0; n < DAC960_MaxLogicalDrives; n++) {
        struct gendisk *disk = Controller->disks[n];
        struct request_queue *RequestQueue;

        /* for now, let all request queues share controller's lock */
        RequestQueue = blk_init_queue(DAC960_RequestFunction,&Controller->queue_lock);
        if (!RequestQueue) {
                printk("DAC960: failure to allocate request queue\n");
                continue;
        }
        Controller->RequestQueue[n] = RequestQueue;
        blk_queue_bounce_limit(RequestQueue, Controller->BounceBufferLimit);
        RequestQueue->queuedata = Controller;
        blk_queue_max_hw_segments(RequestQueue, Controller->DriverScatterGatherLimit);
        blk_queue_max_phys_segments(RequestQueue, Controller->DriverScatterGatherLimit);
        blk_queue_max_sectors(RequestQueue, Controller->MaxBlocksPerCommand);
        disk->queue = RequestQueue;
        sprintf(disk->disk_name, "rd/c%dd%d", Controller->ControllerNumber, n);
        disk->major = MajorNumber;
        disk->first_minor = n << DAC960_MaxPartitionsBits;
        disk->fops = &DAC960_BlockDeviceOperations;
   }
  /*
    Indicate the Block Device Registration completed successfully,
  */
  return true;
}


/*
  DAC960_UnregisterBlockDevice unregisters the Block Device structures
  associated with Controller.
*/

static void DAC960_UnregisterBlockDevice(DAC960_Controller_T *Controller)
{
  int MajorNumber = DAC960_MAJOR + Controller->ControllerNumber;
  int disk;

  /* does order matter when deleting gendisk and cleanup in request queue? */
  for (disk = 0; disk < DAC960_MaxLogicalDrives; disk++) {
        del_gendisk(Controller->disks[disk]);
        blk_cleanup_queue(Controller->RequestQueue[disk]);
        Controller->RequestQueue[disk] = NULL;
  }

  /*
    Unregister the Block Device Major Number for this DAC960 Controller.
  */
  unregister_blkdev(MajorNumber, "dac960");
}

/*
  DAC960_ComputeGenericDiskInfo computes the values for the Generic Disk
  Information Partition Sector Counts and Block Sizes.
*/

static void DAC960_ComputeGenericDiskInfo(DAC960_Controller_T *Controller)
{
        int disk;
        for (disk = 0; disk < DAC960_MaxLogicalDrives; disk++)
                set_capacity(Controller->disks[disk], disk_size(Controller, disk));
}

/*
  DAC960_ReportErrorStatus reports Controller BIOS Messages passed through
  the Error Status Register when the driver performs the BIOS handshaking.
  It returns true for fatal errors and false otherwise.
*/

static bool DAC960_ReportErrorStatus(DAC960_Controller_T *Controller,
                                        unsigned char ErrorStatus,
                                        unsigned char Parameter0,
                                        unsigned char Parameter1)
{
  switch (ErrorStatus)
    {
    case 0x00:
      DAC960_Notice("Physical Device %d:%d Not Responding\n",
                    Controller, Parameter1, Parameter0);
      break;
    case 0x08:
      if (Controller->DriveSpinUpMessageDisplayed) break;
      DAC960_Notice("Spinning Up Drives\n", Controller);
      Controller->DriveSpinUpMessageDisplayed = true;
      break;
    case 0x30:
      DAC960_Notice("Configuration Checksum Error\n", Controller);
      break;
    case 0x60:
      DAC960_Notice("Mirror Race Recovery Failed\n", Controller);
      break;
    case 0x70:
      DAC960_Notice("Mirror Race Recovery In Progress\n", Controller);
      break;
    case 0x90:
      DAC960_Notice("Physical Device %d:%d COD Mismatch\n",
                    Controller, Parameter1, Parameter0);
      break;
    case 0xA0:
      DAC960_Notice("Logical Drive Installation Aborted\n", Controller);
      break;
    case 0xB0:
      DAC960_Notice("Mirror Race On A Critical Logical Drive\n", Controller);
      break;
    case 0xD0:
      DAC960_Notice("New Controller Configuration Found\n", Controller);
      break;
    case 0xF0:
      DAC960_Error("Fatal Memory Parity Error for Controller at\n", Controller);
      return true;
    default:
      DAC960_Error("Unknown Initialization Error %02X for Controller at\n",
                   Controller, ErrorStatus);
      return true;
    }
  return false;
}


/*
 * DAC960_DetectCleanup releases the resources that were allocated
 * during DAC960_DetectController().  DAC960_DetectController can
 * has several internal failure points, so not ALL resources may 
 * have been allocated.  It's important to free only
 * resources that HAVE been allocated.  The code below always
 * tests that the resource has been allocated before attempting to
 * free it.
 */
static void DAC960_DetectCleanup(DAC960_Controller_T *Controller)
{
  int i;

  /* Free the memory mailbox, status, and related structures */
  free_dma_loaf(Controller->PCIDevice, &Controller->DmaPages);
  if (Controller->MemoryMappedAddress) {
        switch(Controller->HardwareType)
        {
                case DAC960_GEM_Controller:
                        DAC960_GEM_DisableInterrupts(Controller->BaseAddress);
                        break;
                case DAC960_BA_Controller:
                        DAC960_BA_DisableInterrupts(Controller->BaseAddress);
                        break;
                case DAC960_LP_Controller:
                        DAC960_LP_DisableInterrupts(Controller->BaseAddress);
                        break;
                case DAC960_LA_Controller:
                        DAC960_LA_DisableInterrupts(Controller->BaseAddress);
                        break;
                case DAC960_PG_Controller:
                        DAC960_PG_DisableInterrupts(Controller->BaseAddress);
                        break;
                case DAC960_PD_Controller:
                        DAC960_PD_DisableInterrupts(Controller->BaseAddress);
                        break;
                case DAC960_P_Controller:
                        DAC960_PD_DisableInterrupts(Controller->BaseAddress);
                        break;
        }
        iounmap(Controller->MemoryMappedAddress);
  }
  if (Controller->IRQ_Channel)
        free_irq(Controller->IRQ_Channel, Controller);
  if (Controller->IO_Address)
        release_region(Controller->IO_Address, 0x80);
  pci_disable_device(Controller->PCIDevice);
  for (i = 0; (i < DAC960_MaxLogicalDrives) && Controller->disks[i]; i++)
       put_disk(Controller->disks[i]);
  DAC960_Controllers[Controller->ControllerNumber] = NULL;
  kfree(Controller);
}


/*
  DAC960_DetectController detects Mylex DAC960/AcceleRAID/eXtremeRAID
  PCI RAID Controllers by interrogating the PCI Configuration Space for
  Controller Type.
*/

static DAC960_Controller_T * 
DAC960_DetectController(struct pci_dev *PCI_Device,
                        const struct pci_device_id *entry)
{
  struct DAC960_privdata *privdata =
                (struct DAC960_privdata *)entry->driver_data;
  irq_handler_t InterruptHandler = privdata->InterruptHandler;
  unsigned int MemoryWindowSize = privdata->MemoryWindowSize;
  DAC960_Controller_T *Controller = NULL;
  unsigned char DeviceFunction = PCI_Device->devfn;
  unsigned char ErrorStatus, Parameter0, Parameter1;
  unsigned int IRQ_Channel;
  void __iomem *BaseAddress;
  int i;

  Controller = kzalloc(sizeof(DAC960_Controller_T), GFP_ATOMIC);
  if (Controller == NULL) {
        DAC960_Error("Unable to allocate Controller structure for "
                       "Controller at\n", NULL);
        return NULL;
  }
  Controller->ControllerNumber = DAC960_ControllerCount;
  DAC960_Controllers[DAC960_ControllerCount++] = Controller;
  Controller->Bus = PCI_Device->bus->number;
  Controller->FirmwareType = privdata->FirmwareType;
  Controller->HardwareType = privdata->HardwareType;
  Controller->Device = DeviceFunction >> 3;
  Controller->Function = DeviceFunction & 0x7;
  Controller->PCIDevice = PCI_Device;
  strcpy(Controller->FullModelName, "DAC960");

  if (pci_enable_device(PCI_Device))
        goto Failure;

  switch (Controller->HardwareType)
  {
        case DAC960_GEM_Controller:
          Controller->PCI_Address = pci_resource_start(PCI_Device, 0);
          break;
        case DAC960_BA_Controller:
          Controller->PCI_Address = pci_resource_start(PCI_Device, 0);
          break;
        case DAC960_LP_Controller:
          Controller->PCI_Address = pci_resource_start(PCI_Device, 0);
          break;
        case DAC960_LA_Controller:
          Controller->PCI_Address = pci_resource_start(PCI_Device, 0);
          break;
        case DAC960_PG_Controller:
          Controller->PCI_Address = pci_resource_start(PCI_Device, 0);
          break;
        case DAC960_PD_Controller:
          Controller->IO_Address = pci_resource_start(PCI_Device, 0);
          Controller->PCI_Address = pci_resource_start(PCI_Device, 1);
          break;
        case DAC960_P_Controller:
          Controller->IO_Address = pci_resource_start(PCI_Device, 0);
          Controller->PCI_Address = pci_resource_start(PCI_Device, 1);
          break;
  }

  pci_set_drvdata(PCI_Device, (void *)((long)Controller->ControllerNumber));
  for (i = 0; i < DAC960_MaxLogicalDrives; i++) {
        Controller->disks[i] = alloc_disk(1<<DAC960_MaxPartitionsBits);
        if (!Controller->disks[i])
                goto Failure;
        Controller->disks[i]->private_data = (void *)((long)i);
  }
  init_waitqueue_head(&Controller->CommandWaitQueue);
  init_waitqueue_head(&Controller->HealthStatusWaitQueue);
  spin_lock_init(&Controller->queue_lock);
  DAC960_AnnounceDriver(Controller);
  /*
    Map the Controller Register Window.
  */
 if (MemoryWindowSize < PAGE_SIZE)
        MemoryWindowSize = PAGE_SIZE;
  Controller->MemoryMappedAddress =
        ioremap_nocache(Controller->PCI_Address & PAGE_MASK, MemoryWindowSize);
  Controller->BaseAddress =
        Controller->MemoryMappedAddress + (Controller->PCI_Address & ~PAGE_MASK);
  if (Controller->MemoryMappedAddress == NULL)
  {
          DAC960_Error("Unable to map Controller Register Window for "
                       "Controller at\n", Controller);
          goto Failure;
  }
  BaseAddress = Controller->BaseAddress;
  switch (Controller->HardwareType)
  {
        case DAC960_GEM_Controller:
          DAC960_GEM_DisableInterrupts(BaseAddress);
          DAC960_GEM_AcknowledgeHardwareMailboxStatus(BaseAddress);
          udelay(1000);
          while (DAC960_GEM_InitializationInProgressP(BaseAddress))
            {
              if (DAC960_GEM_ReadErrorStatus(BaseAddress, &ErrorStatus,
                                            &Parameter0, &Parameter1) &&
                  DAC960_ReportErrorStatus(Controller, ErrorStatus,
                                           Parameter0, Parameter1))
                goto Failure;
              udelay(10);
            }
          if (!DAC960_V2_EnableMemoryMailboxInterface(Controller))
            {
              DAC960_Error("Unable to Enable Memory Mailbox Interface "
                           "for Controller at\n", Controller);
              goto Failure;
            }
          DAC960_GEM_EnableInterrupts(BaseAddress);
          Controller->QueueCommand = DAC960_GEM_QueueCommand;
          Controller->ReadControllerConfiguration =
            DAC960_V2_ReadControllerConfiguration;
          Controller->ReadDeviceConfiguration =
            DAC960_V2_ReadDeviceConfiguration;
          Controller->ReportDeviceConfiguration =
            DAC960_V2_ReportDeviceConfiguration;
          Controller->QueueReadWriteCommand =
            DAC960_V2_QueueReadWriteCommand;
          break;
        case DAC960_BA_Controller:
          DAC960_BA_DisableInterrupts(BaseAddress);
          DAC960_BA_AcknowledgeHardwareMailboxStatus(BaseAddress);
          udelay(1000);
          while (DAC960_BA_InitializationInProgressP(BaseAddress))
            {
              if (DAC960_BA_ReadErrorStatus(BaseAddress, &ErrorStatus,
                                            &Parameter0, &Parameter1) &&
                  DAC960_ReportErrorStatus(Controller, ErrorStatus,
                                           Parameter0, Parameter1))
                goto Failure;
              udelay(10);
            }
          if (!DAC960_V2_EnableMemoryMailboxInterface(Controller))
            {
              DAC960_Error("Unable to Enable Memory Mailbox Interface "
                           "for Controller at\n", Controller);
              goto Failure;
            }
          DAC960_BA_EnableInterrupts(BaseAddress);
          Controller->QueueCommand = DAC960_BA_QueueCommand;
          Controller->ReadControllerConfiguration =
            DAC960_V2_ReadControllerConfiguration;
          Controller->ReadDeviceConfiguration =
            DAC960_V2_ReadDeviceConfiguration;
          Controller->ReportDeviceConfiguration =
            DAC960_V2_ReportDeviceConfiguration;
          Controller->QueueReadWriteCommand =
            DAC960_V2_QueueReadWriteCommand;
          break;
        case DAC960_LP_Controller:
          DAC960_LP_DisableInterrupts(BaseAddress);
          DAC960_LP_AcknowledgeHardwareMailboxStatus(BaseAddress);
          udelay(1000);
          while (DAC960_LP_InitializationInProgressP(BaseAddress))
            {
              if (DAC960_LP_ReadErrorStatus(BaseAddress, &ErrorStatus,
                                            &Parameter0, &Parameter1) &&
                  DAC960_ReportErrorStatus(Controller, ErrorStatus,
                                           Parameter0, Parameter1))
                goto Failure;
              udelay(10);
            }
          if (!DAC960_V2_EnableMemoryMailboxInterface(Controller))
            {
              DAC960_Error("Unable to Enable Memory Mailbox Interface "
                           "for Controller at\n", Controller);
              goto Failure;
            }
          DAC960_LP_EnableInterrupts(BaseAddress);
          Controller->QueueCommand = DAC960_LP_QueueCommand;
          Controller->ReadControllerConfiguration =
            DAC960_V2_ReadControllerConfiguration;
          Controller->ReadDeviceConfiguration =
            DAC960_V2_ReadDeviceConfiguration;
          Controller->ReportDeviceConfiguration =
            DAC960_V2_ReportDeviceConfiguration;
          Controller->QueueReadWriteCommand =
            DAC960_V2_QueueReadWriteCommand;
          break;
        case DAC960_LA_Controller:
          DAC960_LA_DisableInterrupts(BaseAddress);
          DAC960_LA_AcknowledgeHardwareMailboxStatus(BaseAddress);
          udelay(1000);
          while (DAC960_LA_InitializationInProgressP(BaseAddress))
            {
              if (DAC960_LA_ReadErrorStatus(BaseAddress, &ErrorStatus,
                                            &Parameter0, &Parameter1) &&
                  DAC960_ReportErrorStatus(Controller, ErrorStatus,
                                           Parameter0, Parameter1))
                goto Failure;
              udelay(10);
            }
          if (!DAC960_V1_EnableMemoryMailboxInterface(Controller))
            {
              DAC960_Error("Unable to Enable Memory Mailbox Interface "
                           "for Controller at\n", Controller);
              goto Failure;
            }
          DAC960_LA_EnableInterrupts(BaseAddress);
          if (Controller->V1.DualModeMemoryMailboxInterface)
            Controller->QueueCommand = DAC960_LA_QueueCommandDualMode;
          else Controller->QueueCommand = DAC960_LA_QueueCommandSingleMode;
          Controller->ReadControllerConfiguration =
            DAC960_V1_ReadControllerConfiguration;
          Controller->ReadDeviceConfiguration =
            DAC960_V1_ReadDeviceConfiguration;
          Controller->ReportDeviceConfiguration =
            DAC960_V1_ReportDeviceConfiguration;
          Controller->QueueReadWriteCommand =
            DAC960_V1_QueueReadWriteCommand;
          break;
        case DAC960_PG_Controller:
          DAC960_PG_DisableInterrupts(BaseAddress);
          DAC960_PG_AcknowledgeHardwareMailboxStatus(BaseAddress);
          udelay(1000);
          while (DAC960_PG_InitializationInProgressP(BaseAddress))
            {
              if (DAC960_PG_ReadErrorStatus(BaseAddress, &ErrorStatus,
                                            &Parameter0, &Parameter1) &&
                  DAC960_ReportErrorStatus(Controller, ErrorStatus,
                                           Parameter0, Parameter1))
                goto Failure;
              udelay(10);
            }
          if (!DAC960_V1_EnableMemoryMailboxInterface(Controller))
            {
              DAC960_Error("Unable to Enable Memory Mailbox Interface "
                           "for Controller at\n", Controller);
              goto Failure;
            }
          DAC960_PG_EnableInterrupts(BaseAddress);
          if (Controller->V1.DualModeMemoryMailboxInterface)
            Controller->QueueCommand = DAC960_PG_QueueCommandDualMode;
          else Controller->QueueCommand = DAC960_PG_QueueCommandSingleMode;
          Controller->ReadControllerConfiguration =
            DAC960_V1_ReadControllerConfiguration;
          Controller->ReadDeviceConfiguration =
            DAC960_V1_ReadDeviceConfiguration;
          Controller->ReportDeviceConfiguration =
            DAC960_V1_ReportDeviceConfiguration;
          Controller->QueueReadWriteCommand =
            DAC960_V1_QueueReadWriteCommand;
          break;
        case DAC960_PD_Controller:
          if (!request_region(Controller->IO_Address, 0x80,
                              Controller->FullModelName)) {
                DAC960_Error("IO port 0x%d busy for Controller at\n",
                             Controller, Controller->IO_Address);
                goto Failure;
          }
          DAC960_PD_DisableInterrupts(BaseAddress);
          DAC960_PD_AcknowledgeStatus(BaseAddress);
          udelay(1000);
          while (DAC960_PD_InitializationInProgressP(BaseAddress))
            {
              if (DAC960_PD_ReadErrorStatus(BaseAddress, &ErrorStatus,
                                            &Parameter0, &Parameter1) &&
                  DAC960_ReportErrorStatus(Controller, ErrorStatus,
                                           Parameter0, Parameter1))
                goto Failure;
              udelay(10);
            }
          if (!DAC960_V1_EnableMemoryMailboxInterface(Controller))
            {
              DAC960_Error("Unable to allocate DMA mapped memory "
                           "for Controller at\n", Controller);
              goto Failure;
            }
          DAC960_PD_EnableInterrupts(BaseAddress);
          Controller->QueueCommand = DAC960_PD_QueueCommand;
          Controller->ReadControllerConfiguration =
            DAC960_V1_ReadControllerConfiguration;
          Controller->ReadDeviceConfiguration =
            DAC960_V1_ReadDeviceConfiguration;
          Controller->ReportDeviceConfiguration =
            DAC960_V1_ReportDeviceConfiguration;
          Controller->QueueReadWriteCommand =
            DAC960_V1_QueueReadWriteCommand;
          break;
        case DAC960_P_Controller:
          if (!request_region(Controller->IO_Address, 0x80,
                              Controller->FullModelName)){
                DAC960_Error("IO port 0x%d busy for Controller at\n",
                             Controller, Controller->IO_Address);
                goto Failure;
          }
          DAC960_PD_DisableInterrupts(BaseAddress);
          DAC960_PD_AcknowledgeStatus(BaseAddress);
          udelay(1000);
          while (DAC960_PD_InitializationInProgressP(BaseAddress))
            {
              if (DAC960_PD_ReadErrorStatus(BaseAddress, &ErrorStatus,
                                            &Parameter0, &Parameter1) &&
                  DAC960_ReportErrorStatus(Controller, ErrorStatus,
                                           Parameter0, Parameter1))
                goto Failure;
              udelay(10);