/*===================================================================
 *
 *                    Linux MegaRAID device driver
 *
 * Copyright 2001  American Megatrends Inc.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Version : v1.18 (Oct 11, 2001)
 *
 * Description: Linux device driver for LSI Logic MegaRAID controller
 *
 * Supported controllers: MegaRAID 418, 428, 438, 466, 762, 467, 471, 490
 *                                      493.
 * History:
 *
 * Version 0.90:
 *     Original source contributed by Dell; integrated it into the kernel and
 *     cleaned up some things.  Added support for 438/466 controllers.
 * Version 0.91:
 *     Aligned mailbox area on 16-byte boundary.
 *     Added schedule() at the end to properly clean up.
 *     Made improvements for conformity to linux driver standards.
 *
 * Version 0.92:
 *     Added support for 2.1 kernels.
 *         Reads from pci_dev struct, so it's not dependent on pcibios.
 *         Added some missing virt_to_bus() translations.
 *     Added support for SMP.
 *         Changed global cli()'s to spinlocks for 2.1, and simulated
 *          spinlocks for 2.0.
 *     Removed setting of SA_INTERRUPT flag when requesting Irq.
 *
 * Version 0.92ac:
 *     Small changes to the comments/formatting. Plus a couple of
 *      added notes. Returned to the authors. No actual code changes
 *      save printk levels.
 *     8 Oct 98        Alan Cox <alan.cox@linux.org>
 *
 *     Merged with 2.1.131 source tree.
 *     12 Dec 98       K. Baranowski <kgb@knm.org.pl>
 *
 * Version 0.93:
 *     Added support for vendor specific ioctl commands (M_RD_IOCTL_CMD+xxh)
 *     Changed some fields in MEGARAID struct to better values.
 *     Added signature check for Rp controllers under 2.0 kernels
 *     Changed busy-wait loop to be time-based
 *     Fixed SMP race condition in isr
 *     Added kfree (sgList) on release
 *     Added #include linux/version.h to megaraid.h for hosts.h
 *     Changed max_id to represent max logical drives instead of targets.
 *
 * Version 0.94:
 *     Got rid of some excess locking/unlocking
 *     Fixed slight memory corruption problem while memcpy'ing into mailbox
 *     Changed logical drives to be reported as luns rather than targets
 *     Changed max_id to 16 since it is now max targets/chan again.
 *     Improved ioctl interface for upcoming megamgr
 *
 * Version 0.95:
 *     Fixed problem of queueing multiple commands to adapter;
 *       still has some strange problems on some setups, so still
 *       defaults to single.  To enable parallel commands change
 *       #define MULTI_IO in megaraid.h
 *     Changed kmalloc allocation to be done in beginning.
 *     Got rid of C++ style comments
 *
 * Version 0.96:
 *     762 fully supported.
 *
 * Version 0.97:
 *     Changed megaraid_command to use wait_queue.
 *
 * Version 1.00:
 *     Checks to see if an irq occurred while in isr, and runs through
 *       routine again.
 *     Copies mailbox to temp area before processing in isr
 *     Added barrier() in busy wait to fix volatility bug
 *     Uses separate list for freed Scbs, keeps track of cmd state
 *     Put spinlocks around entire queue function for now...
 *     Full multi-io commands working stablely without previous problems
 *     Added skipXX LILO option for Madrona motherboard support
 *
 * Version 1.01:
 *     Fixed bug in mega_cmd_done() for megamgr control commands,
 *       the host_byte in the result code from the scsi request to
 *       scsi midlayer is set to DID_BAD_TARGET when adapter's
 *       returned codes are 0xF0 and 0xF4.
 *
 * Version 1.02:
 *     Fixed the tape drive bug by extending the adapter timeout value
 *       for passthrough command to 60 seconds in mega_build_cmd().
 *
 * Version 1.03:
 *    Fixed Madrona support.
 *    Changed the adapter timeout value from 60 sec in 1.02 to 10 min
 *      for bigger and slower tape drive.
 *    Added driver version printout at driver loadup time
 *
 * Version 1.04
 *    Added code for 40 ld FW support.
 *    Added new ioctl command 0x81 to support NEW_READ/WRITE_CONFIG with
 *      data area greater than 4 KB, which is the upper bound for data
 *      tranfer through scsi_ioctl interface.
 *    The additional 32 bit field for 64bit address in the newly defined
 *      mailbox64 structure is set to 0 at this point.
 *
 * Version 1.05
 *    Changed the queing implementation for handling SCBs and completed
 *      commands.
 *    Added spinlocks in the interrupt service routine to enable the driver
 *      function in the SMP environment.
 *    Fixed the problem of unnecessary aborts in the abort entry point, which
 *      also enables the driver to handle large amount of I/O requests for
 *      long duration of time.
 * Version 1.06
 *              Intel Release
 * Version 1.07
 *    Removed the usage of uaccess.h file for kernel versions less than
 *    2.0.36, as this file is not present in those versions.
 *
 * Version 108
 *    Modified mega_ioctl so that 40LD megamanager would run
 *    Made some changes for 2.3.XX compilation , esp wait structures
 *    Code merge between 1.05 and 1.06 .
 *    Bug fixed problem with ioctl interface for concurrency between
 *    8ld and 40ld firwmare
 *    Removed the flawed semaphore logic for handling new config command
 *    Added support for building own scatter / gather list for big user
 *    mode buffers
 *    Added /proc file system support ,so that information is available in
 *    human readable format
 *
 * Version 1a08
 *    Changes for IA64 kernels. Checked for CONFIG_PROC_FS flag
 *
 * Version 1b08
 *    Include file changes.
 * Version 1b08b
 *    Change PCI ID value for the 471 card, use #defines when searching
 *    for megaraid cards.
 *
 * Version 1.10
 *
 *      I) Changes made to make following ioctl commands work in 0x81 interface
 *              a)DCMD_DELETE_LOGDRV
 *              b)DCMD_GET_DISK_CONFIG
 *              c)DCMD_DELETE_DRIVEGROUP
 *              d)NC_SUBOP_ENQUIRY3
 *              e)DCMD_CHANGE_LDNO
 *              f)DCMD_CHANGE_LOOPID
 *              g)DCMD_FC_READ_NVRAM_CONFIG
 *      h)DCMD_WRITE_CONFIG
 *      II) Added mega_build_kernel_sg function
 *  III)Firmware flashing option added
 *
 * Version 1.10a
 *
 *      I)Dell updates included in the source code.
 *              Note:   This change is not tested due to the unavailability of IA64 kernel
 *      and it is in the #ifdef DELL_MODIFICATION macro which is not defined
 *
 * Version 1.10b
 *
 *      I)In M_RD_IOCTL_CMD_NEW command the wrong way of copying the data
 *    to the user address corrected
 *
 * Version 1.10c
 *
 *      I) DCMD_GET_DISK_CONFIG opcode updated for the firmware changes.
 *
 * Version 1.11
 *      I)  Version number changed from 1.10c to 1.11
 *  II) DCMD_WRITE_CONFIG(0x0D) command in the driver changed from
 *      scatter/gather list mode to direct pointer mode..
 *     Fixed bug of undesirably detecting HP onboard controllers which
 *       are disabled.
 *
 *      Version 1.12 (Sep 21, 2000)
 *
 *     I. Changes have been made for Dynamic DMA mapping in IA64 platform.
 *                To enable all these changes define M_RD_DYNAMIC_DMA_SUPPORT in megaraid.h
 *        II. Got rid of windows mode comments
 *       III. Removed unwanted code segments
 *    IV. Fixed bug of HP onboard controller information (commented with
 *                 MEGA_HP_FIX)
 *
 *      Version 1a12
 *      I.      reboot notifier and new ioctl changes ported from 1c09
 *
 *      Version 1b12
 *      I.      Changes in new ioctl interface routines ( Nov 06, 2000 )
 *
 *      Version 1c12
 *      I.      Changes in new ioctl interface routines ( Nov 07, 2000 )
 *
 *      Version 1d12
 *      I.      Compilation error under kernel 2.4.0 for 32-bit machine in mega_ioctl
 *
 *      Version 1e12, 1f12
 *      1.  Fixes for pci_map_single, pci_alloc_consistent along with mailbox
 *          alignment
 *
 *      Version 1.13beta
 *      Added Support for Full 64bit address space support. If firmware
 *      supports 64bit, it goes to 64 bit mode even on x86 32bit 
 *      systems. Data Corruption Issues while running on test9 kernel
 *      on IA64 systems. This issue not seen on test11 on x86 system
 *
 *      Version 1.13c
 *      1. Resolved Memory Leak when using M_RD_IOCTL_CMD interface
 *      2. Resolved Queuing problem when MailBox Blocks
 *      3. Added unregister_reboot_notifier support
 * 
 *      Version 1.13d
 *      Experimental changes in interfacing with the controller in ISR
 *
 *      Version 1.13e
 *      Fixed Broken 2.2.XX compilation changes + misc changes
 *
 *      Version 1.13f to 1.13i
 *      misc changes + code clean up
 *      Cleaned up the ioctl code and added set_mbox_xfer_addr()
 *      Support for START_DEV (6)
 *      
 *      Version 1.13j
 *      Moved some code to megaraid.h file, replaced some hard coded values 
 *      with respective macros. Changed some functions to static
 *
 *      Version 1.13k
 *      Only some idendation correction to 1.13j 
 *
 *      Version 1.13l , 1.13m, 1.13n, 1.13o
 *      Minor Identation changes + misc changes
 *
 *      Version 1.13q
 *      Paded the new uioctl_t MIMD structure for maintaining alignment 
 *      and size across 32 / 64 bit platforms
 *      Changed the way MIMD IOCTL interface used virt_to_bus() to use pci
 *      memory location
 *
 *      Version 1.13r
 *      2.4.xx SCSI Changes.
 *
 *      Version 1.13s
 *      Stats counter fixes
 *      Temporary fix for some 64 bit firmwares in 2.4.XX kernels
 *
 *      Version 1.13t
 *      Support for 64bit version of READ/WRITE/VIEW DISK CONFIG
 *
 *      Version 1.14
 *      Did away with MEGADEV_IOCTL flag. It is now standard part of driver
 *      without need for a special #define flag
 *      Disabled old scsi ioctl path for kernel versions > 2.3.xx. This is due
 *      to the nature in which the new scsi code queues a new scsi command to 
 *      controller during SCSI IO Completion
 *      Driver now checks for sub-system vendor id before taking ownership of
 *      the controller
 *
 *      Version 1.14a
 *      Added Host re-ordering
 *
 *      Version 1.14b
 *      Corrected some issue which caused the older cards not to work
 *      
 *      Version 1.14c
 *      IOCTL changes for not handling the non-64bit firmwares under 2.4.XX
 *      kernel
 *
 *      Version 1.14d
 *      Fixed Various MIMD Synchronization Issues
 *      
 *      Version 1.14e
 *      Fixed the error handling during card initialization
 *
 *      Version 1.14f
 *      Multiple invocations of mimd phase I ioctl stalls the cpu. Replaced
 *      spinlock with semaphore(mutex)
 *
 *      Version 1.14g
 *      Fixed running out of scbs issues while running MIMD apps under heavy IO
 *
 *      Version 1.14g-ac - 02/03/01
 *      Reformatted to Linux format so I could compare to old one and cross
 *      check bug fixes
 *      Re fixed the assorted missing 'static' cases
 *      Removed some unneeded version checks
 *      Cleaned up some of the VERSION checks in the code
 *      Left 2.0 support but removed 2.1.x support.
 *      Collected much of the compat glue into one spot
 *
 *      Version 1.14g-ac2 - 22/03/01
 *      Fixed a non obvious dereference after free in the driver unload path
 *
 *      Version 1.14i
 *      changes for making 32bit application run on IA64
 *
 *      Version 1.14j
 *      Tue Mar 13 14:27:54 EST 2001 - AM
 *      Changes made in the driver to be able to run applications if the
 *      system has memory >4GB.
 *
 *
 *      Version 1.14k
 *      Thu Mar 15 18:38:11 EST 2001 - AM
 *
 *      Firmware version check removed if subsysid==0x1111 and
 *      subsysvid==0x1111, since its not yet initialized.
 *
 *      changes made to correctly calculate the base in mega_findCard.
 *
 *      Driver informational messages now appear on the console as well as
 *      with dmesg
 *
 *      Older ioctl interface is returned failure on newer(2.4.xx) kernels.
 *
 *      Inclusion of "modversions.h" is still a debatable question. It is
 *      included anyway with this release.
 *
 *      Version 1.14l
 *      Mon Mar 19 17:39:46 EST 2001 - AM
 *
 *      Assorted changes to remove compilation error in 1.14k when compiled
 *      with kernel < 2.4.0
 *
 *      Version 1.14m
 *      Tue Mar 27 12:09:22 EST 2001 - AM
 *
 *      Added support for extended CDBs ( > 10 bytes ) and OBDR ( One Button
 *      Disaster Recovery ) feature.
 *
 *
 *      Version 1.14n
 *      Tue Apr 10 14:28:13 EDT 2001 - AM
 *
 *      "modeversions.h" is no longer included in the code.
 *      2.4.xx style mutex initialization used for older kernels also
 *
 *      Version 1.14o
 *      Wed Apr 18 17:47:26 EDT 2001 - PJ
 *
 *      Before returning status for 'inquiry', we first check if request buffer
 *      is SG list, and then return appropriate status
 *
 *      Version 1.14p
 *      Wed Apr 25 13:44:48 EDT 2001 - PJ
 *
 *      SCSI result made appropriate in case of check conditions for extended
 *      passthru commands
 *
 *      Do not support lun >7 for physically accessed devices 
 *
 *      
 *      Version 1.15
 *      Thu Apr 19 09:38:38 EDT 2001 - AM
 *
 *      1.14l rollover to 1.15 - merged with main trunk after 1.15d
 *
 *      Version 1.15b
 *  Wed May 16 20:10:01 EDT 2001 - AM
 *
 *      "modeversions.h" is no longer included in the code.
 *      2.4.xx style mutex initialization used for older kernels also
 *      Brought in-sync with Alan's changes in 2.4.4
 *      Note: 1.15a is on OBDR branch(main trunk), and is not merged with yet.
 *
 * Version 1.15c
 * Mon May 21 23:10:42 EDT 2001 - AM
 *
 * ioctl interface uses 2.4.x conforming pci dma calls
 * similar calls used for older kernels
 *
 * Version 1.15d
 * Wed May 30 17:30:41 EDT 2001 - AM
 *
 * NULL is not a valid first argument for pci_alloc_consistent() on
 * IA64(2.4.3-2.10.1). Code shuffling done in ioctl interface to get
 * "pci_dev" before making calls to pci interface routines.
 *
 * Version 1.16pre
 * Fri Jun  1 19:40:48 EDT 2001 - AM
 *
 * 1.14p and 1.15d merged
 * ROMB support added
 *
 * Version 1.16-pre1
 * Mon Jun  4 15:01:01 EDT 2001 - AM
 *
 * Non-ROMB firmware do no DMA support 0xA9 command. Value 0xFF
 * (all channels are raid ) is chosen for those firmware.
 *
 * Version 1.16-pre2
 * Mon Jun 11 18:15:31 EDT 2001 - AM
 *
 * Changes for boot from any logical drive
 *
 * Version 1.16
 * Tue Jun 26 18:07:02 EDT 2001 - AM
 *
 * branched at 1.14p
 *
 * Check added for HP 1M/2M controllers if having firmware H.01.07 or
 * H.01.08. If found, disable 64 bit support since these firmware have
 * limitations for 64 bit addressing
 *
 *
 * Version 1.17
 * Thu Jul 12 11:14:09 EDT 2001 - AM
 *
 * 1.16pre2 and 1.16 merged.
 *
 * init_MUTEX and init_MUTEX_LOCKED are defined in 2.2.19. Pre-processor
 * statements are added for them
 *
 * Linus's 2.4.7pre3 kernel introduces a new field 'max_sectors' in Scsi_Host
 * structure, to improve IO performance.
 *
 *
 * Version 1.17a
 * Fri Jul 13 18:44:01 EDT 2001 - AM
 *
 * Starting from kernel 2.4.x, LUN is not < 8 - following SCSI-III. So to have
 * our current formula working to calculate logical drive number, return
 * failure for LUN > 7
 *
 *
 * Version 1.17b
 * Mon Jul 30 19:24:02 EDT 2001 - AM
 *
 * Added support for random deletion of logical drives
 *
 * Version 1.17c
 * Tue Sep 25 09:37:49 EDT 2001 - Atul Mukker <atulm@lsil.com>
 *
 * With single and dual channel controllers, some virtaul channels are
 * displayed negative.
 *
 * Version 1.17a-ac
 * Mon Aug 6 14:59:29 BST 2001 - "Michael Johnson" <johnsom@home.com>
 *
 * Make the HP print formatting and check for buggy firmware runtime not
 * ifdef dependant.
 *
 *
 * Version 1.17d
 * Thu Oct 11 10:48:45 EDT 2001 - Atul Mukker <atulm@lsil.com>
 *
 * Driver 1.17c oops when loaded without controller.
 *
 * Special case for "use_sg == 1" removed while building the scatter gather
 * list.
 *
 * Version 1.18
 * Thu Oct 11 15:02:53 EDT 2001 - Atul Mukker <atulm@lsil.com>
 *
 * References to AMI have been changed to LSI Logic.
 *
 *
 * BUGS:
 *     Some older 2.1 kernels (eg. 2.1.90) have a bug in pci.c that
 *     fails to detect the controller as a pci device on the system.
 *
 *     Timeout period for upper scsi layer, i.e. SD_TIMEOUT in
 *     /drivers/scsi/sd.c, is too short for this controller. SD_TIMEOUT
 *     value must be increased to (30 * HZ) otherwise false timeouts
 *     will occur in the upper layer.
 *
 *     Never set skip_id. The existing PCI code the megaraid uses fails
 *     to properly check the vendor subid in some cases. Setting this then
 *     makes it steal other i960's and crashes some boxes
 *
 *     Far too many ifdefs for versions.
 *
 *===================================================================*/

#include <linux/config.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/blk.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <asm/pgtable.h>

#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/slab.h> /* for kmalloc() */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)  /* 0x20100 */
#include <linux/bios32.h>
#else
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0)  /* 0x20300 */
#include <asm/spinlock.h>
#else
#include <linux/spinlock.h>
#endif
#endif

#include <asm/io.h>
#include <asm/irq.h>

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,0,24) /* 0x020024 */
#include <asm/uaccess.h>
#endif

/*
 * These header files are required for Shutdown Notification routines
 */
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include "scsi.h"
#include "hosts.h"
#include <scsi/scsicam.h>

#include "megaraid.h"

/*
 *================================================================
 *  #Defines
 *================================================================
 */

#define MAX_SERBUF 160
#define COM_BASE 0x2f8

static ulong RDINDOOR (mega_host_config * megaCfg)
{
        return readl (megaCfg->base + 0x20);
}

static void WRINDOOR (mega_host_config * megaCfg, ulong value)
{
        writel (value, megaCfg->base + 0x20);
}

static ulong RDOUTDOOR (mega_host_config * megaCfg)
{
        return readl (megaCfg->base + 0x2C);
}

static void WROUTDOOR (mega_host_config * megaCfg, ulong value)
{
        writel (value, megaCfg->base + 0x2C);
}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0) /* 0x020200 */
#include <linux/smp.h>
#define cpuid smp_processor_id()
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,4)
#define scsi_set_pci_device(x,y)
#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0) /* 0x020400 */

/*
 *      Linux 2.4 and higher
 *
 *      No driver private lock
 *      Use the io_request_lock not cli/sti
 *      queue task is a simple api without irq forms
 */

MODULE_AUTHOR ("LSI Logic Corporation");
MODULE_DESCRIPTION ("LSI Logic MegaRAID driver");
MODULE_LICENSE ("GPL");

#define DRIVER_LOCK_T
#define DRIVER_LOCK_INIT(p)
#define DRIVER_LOCK(p)
#define DRIVER_UNLOCK(p)
#define IO_LOCK_T unsigned long io_flags = 0
#define IO_LOCK(host) spin_lock_irqsave(host->host_lock,io_flags)
#define IO_UNLOCK(host) spin_unlock_irqrestore(host->host_lock,io_flags)
#define IO_LOCK_IRQ(host) spin_lock_irq(host->host_lock)
#define IO_UNLOCK_IRQ(host) spin_unlock_irq(host->host_lock)

#define queue_task_irq(a,b)     queue_task(a,b)
#define queue_task_irq_off(a,b) queue_task(a,b)

#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)       /* 0x020200 */

/*
 *      Linux 2.2 and higher
 *
 *      No driver private lock
 *      Use the io_request_lock not cli/sti
 *      No pci region api
 *      queue_task is now a single simple API
 */

static char kernel_version[] = UTS_RELEASE;
MODULE_AUTHOR ("LSI Logic Corporation");
MODULE_DESCRIPTION ("LSI Logic MegaRAID driver");

#define DRIVER_LOCK_T
#define DRIVER_LOCK_INIT(p)
#define DRIVER_LOCK(p)
#define DRIVER_UNLOCK(p)
#define IO_LOCK_T unsigned long io_flags = 0
#define IO_LOCK(host) spin_lock_irqsave(host->host_lock,io_flags);
#define IO_UNLOCK(host) spin_unlock_irqrestore(host->host_lock,io_flags);

#define pci_free_consistent(a,b,c,d)
#define pci_unmap_single(a,b,c,d)
#define pci_enable_device(x) (0)
#define queue_task_irq(a,b)     queue_task(a,b)
#define queue_task_irq_off(a,b) queue_task(a,b)

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,2,19) /* 0x020219 */
#define init_MUTEX_LOCKED(x)    (*(x)=MUTEX_LOCKED)
#define init_MUTEX(x)           (*(x)=MUTEX)
#define DECLARE_WAIT_QUEUE_HEAD(x)      struct wait_queue *x = NULL
#endif


#else

/*
 *      Linux 2.0 macros. Here we have to provide some of our own
 *      functionality. We also only work little endian 32bit.
 *      Again no pci_alloc/free api
 *      IO_LOCK/IO_LOCK_T were never used in 2.0 so now are empty 
 */
 
#define cpuid 0
#define DRIVER_LOCK_T long cpu_flags;
#define DRIVER_LOCK_INIT(p)
#define DRIVER_LOCK(p) \
                save_flags(cpu_flags); \
                cli();
#define DRIVER_UNLOCK(p) \
                restore_flags(cpu_flags);
#define IO_LOCK_T
#define IO_LOCK(p)
#define IO_UNLOCK(p)
#define le32_to_cpu(x) (x)
#define cpu_to_le32(x) (x)

#define pci_free_consistent(a,b,c,d)
#define pci_unmap_single(a,b,c,d)

#define init_MUTEX_LOCKED(x)    (*(x)=MUTEX_LOCKED)
#define init_MUTEX(x)           (*(x)=MUTEX)

#define pci_enable_device(x) (0)

/*
 *      2.0 lacks spinlocks, iounmap/ioremap
 */

#define ioremap vremap
#define iounmap vfree

 /* simulate spin locks */
typedef struct {
        volatile char lock;
} spinlock_t;

#define spin_lock_init(x) { (x)->lock = 0;}
#define spin_lock_irqsave(x,flags) { while ((x)->lock) barrier();\
                                        (x)->lock=1; save_flags(flags);\
                                        cli();}
#define spin_unlock_irqrestore(x,flags) { (x)->lock=0; restore_flags(flags);}

#define DECLARE_WAIT_QUEUE_HEAD(x)      struct wait_queue *x = NULL

#endif


#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0) /* 0x020400 */
#define dma_alloc_consistent pci_alloc_consistent
#define dma_free_consistent pci_free_consistent
#else
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,2,19) /* 0x020219 */
typedef unsigned long dma_addr_t;
#endif
void *dma_alloc_consistent(void *, size_t, dma_addr_t *);
void dma_free_consistent(void *, size_t, void *, dma_addr_t);
int mega_get_order(int);
int pow_2(int);
#endif

/* set SERDEBUG to 1 to enable serial debugging */
#define SERDEBUG 0
#if SERDEBUG
static void ser_init (void);
static void ser_puts (char *str);
static void ser_putc (char c);
static int ser_printk (const char *fmt, ...);
#endif

#ifdef CONFIG_PROC_FS
#define COPY_BACK if (offset > megaCfg->procidx) { \
                *eof = TRUE; \
        megaCfg->procidx = 0; \
        megaCfg->procbuf[0] = 0; \
        return 0;} \
 if ((count + offset) > megaCfg->procidx) { \
      count = megaCfg->procidx - offset; \
      *eof = TRUE; } \
      memcpy(page, &megaCfg->procbuf[offset], count); \
      megaCfg->procidx = 0; \
      megaCfg->procbuf[0] = 0;
#endif

/*
 * ================================================================
 *                    Global variables
 *================================================================
 */

/*  Use "megaraid=skipXX" as LILO option to prohibit driver from scanning
    XX scsi id on each channel.  Used for Madrona motherboard, where SAF_TE
    processor id cannot be scanned */

static char *megaraid;
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,1,0)  /* 0x20100 */
#ifdef MODULE
MODULE_PARM (megaraid, "s");
#endif
#endif
static int skip_id = -1;
static int numCtlrs = 0;
static mega_host_config *megaCtlrs[FC_MAX_CHANNELS] = { 0 };
static struct proc_dir_entry *mega_proc_dir_entry;

#if DEBUG
static u32 maxCmdTime = 0;
#endif

static mega_scb *pLastScb = NULL;
static struct notifier_block mega_notifier = {
        megaraid_reboot_notify,
        NULL,
        0
};

/* For controller re-ordering */
struct mega_hbas mega_hbas[MAX_CONTROLLERS];

/*
 * The File Operations structure for the serial/ioctl interface of the driver
 */
/* For controller re-ordering */ 

static struct file_operations megadev_fops = {
        .owner                  = THIS_MODULE,
        .ioctl                  = megadev_ioctl_entry,
};

/*
 * Array to structures for storing the information about the controllers. This
 * information is sent to the user level applications, when they do an ioctl
 * for this information.
 */
static struct mcontroller mcontroller[MAX_CONTROLLERS];

/* The current driver version */
static u32 driver_ver = 114;

/* major number used by the device for character interface */
static int major;

static struct semaphore mimd_ioctl_sem;
static struct semaphore mimd_entry_mtx;

#if SERDEBUG
volatile static spinlock_t serial_lock;
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0)  /* 0x20300 */
static struct proc_dir_entry proc_scsi_megaraid = {
        PROC_SCSI_MEGARAID, 8, "megaraid",
        S_IFDIR | S_IRUGO | S_IXUGO, 2
};
#endif

#ifdef CONFIG_PROC_FS
extern struct proc_dir_entry proc_root;
#endif

static char mega_ch_class;      /* channels are raid or scsi */
#define IS_RAID_CH(ch)  ( (mega_ch_class >> (ch)) & 0x01 )

#if SERDEBUG
static char strbuf[MAX_SERBUF + 1];

static void ser_init (void)
{
        unsigned port = COM_BASE;

        outb (0x80, port + 3);
        outb (0, port + 1);
        /* 9600 Baud, if 19200: outb(6,port) */
        outb (12, port);
        outb (3, port + 3);
        outb (0, port + 1);
}

static void ser_puts (char *str)
{
        char *ptr;

        ser_init ();
        for (ptr = str; *ptr; ++ptr)
                ser_putc (*ptr);
}

static void ser_putc (char c)
{
        unsigned port = COM_BASE;

        while ((inb (port + 5) & 0x20) == 0) ;
        outb (c, port);
        if (c == 0x0a) {
                while ((inb (port + 5) & 0x20) == 0) ;
                outb (0x0d, port);
        }
}

static int ser_printk (const char *fmt, ...)
{
        va_list args;
        int i;
        long flags;

        spin_lock_irqsave (&serial_lock, flags);
        va_start (args, fmt);
        i = vsprintf (strbuf, fmt, args);
        ser_puts (strbuf);
        va_end (args);
        spin_unlock_irqrestore (&serial_lock, flags);

        return i;
}

#define TRACE(a)    { ser_printk a;}

#else
#define TRACE(A)
#endif

#define TRACE1(a)

static void callDone (Scsi_Cmnd * SCpnt)
{
        if (SCpnt->result) {
                TRACE (("*** %.08lx %.02x <%d.%d.%d> = %x\n",
                        SCpnt->serial_number, SCpnt->cmnd[0], SCpnt->channel,
                        SCpnt->target, SCpnt->lun, SCpnt->result));
        }
        SCpnt->scsi_done (SCpnt);
}

/*-------------------------------------------------------------------------
 *
 *                      Local functions
 *
 *-------------------------------------------------------------------------*/

/*=======================
 * Free a SCB structure
 *=======================
 */
static void mega_freeSCB (mega_host_config * megaCfg, mega_scb * pScb)
{

        mega_scb *pScbtmp;

        if ((pScb == NULL) || (pScb->idx >= 0xFE)) {
                return;
        }
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        switch (pScb->dma_type) {
        case M_RD_DMA_TYPE_NONE:
                break;
        case M_RD_PTHRU_WITH_BULK_DATA:
                pci_unmap_single (megaCfg->dev, pScb->dma_h_bulkdata,
                                  pScb->pthru->dataxferlen,
                                  pScb->dma_direction);
                break;
        case M_RD_EPTHRU_WITH_BULK_DATA:
                pci_unmap_single (megaCfg->dev, pScb->dma_h_bulkdata,
                                  pScb->epthru->dataxferlen,
                                  pScb->dma_direction);
                break;
        case M_RD_PTHRU_WITH_SGLIST:
        {
                int count;
                for (count = 0; count < pScb->sglist_count; count++) {
                        pci_unmap_single (megaCfg->dev,
                                          pScb->dma_h_sglist[count],
                                          pScb->sgList[count].length,
                                          pScb->dma_direction);

                }
                break;
        }
        case M_RD_BULK_DATA_ONLY:
                pci_unmap_single (megaCfg->dev,
                                  pScb->dma_h_bulkdata,
                                  pScb->iDataSize, pScb->dma_direction);

                break;
        case M_RD_SGLIST_ONLY:
                pci_unmap_sg (megaCfg->dev,
                              pScb->SCpnt->request_buffer,
                              pScb->SCpnt->use_sg, pScb->dma_direction);
                break;
        default:
                break;
        }
#endif

        /* Unlink from pending queue */
        if (pScb == megaCfg->qPendingH) {

                if (megaCfg->qPendingH == megaCfg->qPendingT)
                        megaCfg->qPendingH = megaCfg->qPendingT = NULL;
                else
                        megaCfg->qPendingH = megaCfg->qPendingH->next;

                megaCfg->qPcnt--;

        } else {
                for (pScbtmp = megaCfg->qPendingH; pScbtmp;
                     pScbtmp = pScbtmp->next) {

                        if (pScbtmp->next == pScb) {

                                pScbtmp->next = pScb->next;

                                if (pScb == megaCfg->qPendingT) {
                                        megaCfg->qPendingT = pScbtmp;
                                }

                                megaCfg->qPcnt--;
                                break;
                        }
                }
        }

        /* Link back into free list */
        pScb->state = SCB_FREE;
        pScb->SCpnt = NULL;

        if (megaCfg->qFreeH == (mega_scb *) NULL) {
                megaCfg->qFreeH = megaCfg->qFreeT = pScb;
        } else {
                megaCfg->qFreeT->next = pScb;
                megaCfg->qFreeT = pScb;
        }

        megaCfg->qFreeT->next = NULL;
        megaCfg->qFcnt++;

}

/*===========================
 * Allocate a SCB structure
 *===========================
 */
static mega_scb *mega_allocateSCB (mega_host_config * megaCfg, Scsi_Cmnd * SCpnt)
{
        mega_scb *pScb;

        /* Unlink command from Free List */
        if ((pScb = megaCfg->qFreeH) != NULL) {
                megaCfg->qFreeH = pScb->next;
                megaCfg->qFcnt--;

                pScb->isrcount = jiffies;
                pScb->next = NULL;
                pScb->state = SCB_ACTIVE;
                pScb->SCpnt = SCpnt;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                pScb->dma_type = M_RD_DMA_TYPE_NONE;
#endif

                return pScb;
        }

        printk (KERN_WARNING "Megaraid: Could not allocate free SCB!!!\n");

        return NULL;
}

/* Run through the list of completed requests  and finish it */
static void mega_rundoneq (mega_host_config * megaCfg)
{
        Scsi_Cmnd *SCpnt;

        while ((SCpnt = megaCfg->qCompletedH) != NULL) {
                megaCfg->qCompletedH = (Scsi_Cmnd *) SCpnt->host_scribble;
                megaCfg->qCcnt--;

                SCpnt->host_scribble = (unsigned char *) NULL;  /* XC : sep 14 */
                /* Callback */
                callDone (SCpnt);
        }

        megaCfg->qCompletedH = megaCfg->qCompletedT = NULL;
}

/*
 * Runs through the list of pending requests
 * Assumes that mega_lock spin_lock has been acquired.
 */
static int mega_runpendq (mega_host_config * megaCfg)
{
        mega_scb *pScb;
        int rc;

        /* Issue any pending commands to the card */
        for (pScb = megaCfg->qPendingH; pScb; pScb = pScb->next) {
                if (pScb->state == SCB_ACTIVE) {
                        if ((rc =
                             megaIssueCmd (megaCfg, pScb->mboxData, pScb, 1)) == -1)
                                return rc;
                }
        }
        return 0;
}

/* Add command to the list of completed requests */

static void mega_cmd_done (mega_host_config * megaCfg, mega_scb * pScb, int status)
{
        int islogical;
        Scsi_Cmnd *SCpnt;
        mega_passthru *pthru;
        mega_ext_passthru *epthru;
        mega_mailbox *mbox;
        struct scatterlist *sgList;
        u8      c;

        if (pScb == NULL) {
                TRACE (("NULL pScb in mega_cmd_done!"));
                printk(KERN_CRIT "NULL pScb in mega_cmd_done!");
        }

        SCpnt = pScb->SCpnt;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        pthru = pScb->pthru;
        epthru = pScb->epthru;
#else
        pthru = &pScb->pthru;
        epthru = &pScb->epthru;
#endif

        mbox = (mega_mailbox *) & pScb->mboxData;

        if (SCpnt == NULL) {
                TRACE (("NULL SCpnt in mega_cmd_done!"));
                TRACE (("pScb->idx = ", pScb->idx));
                TRACE (("pScb->state = ", pScb->state));
                TRACE (("pScb->state = ", pScb->state));
                panic(KERN_ERR "megaraid:Problem...!\n");
        }

        islogical = ( (SCpnt->channel >= megaCfg->productInfo.SCSIChanPresent) &&
                                        (SCpnt->channel <= megaCfg->host->max_channel) );
#if 0
        islogical = (SCpnt->channel == megaCfg->host->max_channel);
#endif

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        /* Special Case to handle PassThrough->XferAddrress > 4GB */
        switch (SCpnt->cmnd[0]) {
        case INQUIRY:
        case READ_CAPACITY:
                memcpy (SCpnt->request_buffer,
                        pScb->bounce_buffer, SCpnt->request_bufflen);
                break;
        }
#endif

        mega_freeSCB (megaCfg, pScb);

        /*
         * Do not return the presence of hard disk on the channel so, inquiry
         * sent, and returned data==hard disk or removable hard disk and not
         * logical, request should return failure! - PJ
         */
#if 0
        if (SCpnt->cmnd[0] == INQUIRY && ((((u_char *) SCpnt->request_buffer)[0] & 0x1F) == TYPE_DISK) && !islogical) {
                status = 0xF0;
        }
#endif
        
        if (SCpnt->cmnd[0] == INQUIRY && !islogical) {
                if ( SCpnt->use_sg ) {
                        sgList = (struct scatterlist *)SCpnt->request_buffer;
                        memcpy(&c, cpu_to_le32(sg_dma_address(&sgList[0])), 0x1);
                } else {
                        memcpy(&c, SCpnt->request_buffer, 0x1);
                }
#if 0
                if( (c & 0x1F ) == TYPE_DISK ) {
                        status = 0xF0;
                }
#endif
                if( IS_RAID_CH(SCpnt->channel) && ((c & 0x1F ) == TYPE_DISK) ) {
                        status = 0xF0;
                }
        }


        /* clear result; otherwise, success returns corrupt value */
        SCpnt->result = 0;

        if ((SCpnt->cmnd[0] & M_RD_IOCTL_CMD)) {        /* i.e. ioctl cmd such as M_RD_IOCTL_CMD, M_RD_IOCTL_CMD_NEW of megamgr */
                switch (status) {
                case 2:
                case 0xF0:
                case 0xF4:
                        SCpnt->result = (DID_BAD_TARGET << 16) | status;
                        break;
                default:
                        SCpnt->result |= status;
                }               /*end of switch */
        } else {
                /* Convert MegaRAID status to Linux error code */
                switch (status) {
                case 0x00:      /* SUCCESS , i.e. SCSI_STATUS_GOOD */
                        SCpnt->result |= (DID_OK << 16);
                        break;

                case 0x02:      /* ERROR_ABORTED, i.e. SCSI_STATUS_CHECK_CONDITION */

                        /*set sense_buffer and result fields */
                        if (mbox->cmd == MEGA_MBOXCMD_PASSTHRU) {
                                memcpy (SCpnt->sense_buffer, pthru->reqsensearea, 14);
                        } else if (mbox->cmd == MEGA_MBOXCMD_EXTPASSTHRU) {
                                SCpnt->result = (DRIVER_SENSE << 24) | (DID_OK << 16) | (CHECK_CONDITION < 1);
                                memcpy(
                                        SCpnt->sense_buffer,
                                        epthru->reqsensearea, 14
                                );
                                SCpnt->result = (DRIVER_SENSE << 24) | (DID_OK << 16) | (CHECK_CONDITION < 1);
                                /*SCpnt->result =
                                        (DRIVER_SENSE << 24) |
                                        (DID_ERROR << 16) | status;*/
                        } else {
                                SCpnt->sense_buffer[0] = 0x70;
                                SCpnt->sense_buffer[2] = ABORTED_COMMAND;
                                SCpnt->result |= (CHECK_CONDITION << 1);
                        }
                        break;

                case 0x08:      /* ERR_DEST_DRIVE_FAILED, i.e. SCSI_STATUS_BUSY */
                        SCpnt->result |= (DID_BUS_BUSY << 16) | status;
                        break;

                default:
                        SCpnt->result |= (DID_BAD_TARGET << 16) | status;
                        break;
                }
        }

        /* Add Scsi_Command to end of completed queue */
        if (megaCfg->qCompletedH == NULL) {
                megaCfg->qCompletedH = megaCfg->qCompletedT = SCpnt;
        } else {
                megaCfg->qCompletedT->host_scribble = (unsigned char *) SCpnt;
                megaCfg->qCompletedT = SCpnt;
        }

        megaCfg->qCompletedT->host_scribble = (unsigned char *) NULL;
        megaCfg->qCcnt++;
}

/*-------------------------------------------------------------------
 *
 *                 Build a SCB from a Scsi_Cmnd
 *
 * Returns a SCB pointer, or NULL
 * If NULL is returned, the scsi_done function MUST have been called
 *
 *-------------------------------------------------------------------*/

static mega_scb *mega_build_cmd (mega_host_config * megaCfg, Scsi_Cmnd * SCpnt)
{
        mega_scb *pScb;
        mega_mailbox *mbox;
        mega_passthru *pthru;
        mega_ext_passthru *epthru;
        long seg;
        char islogical;
        int lun = SCpnt->lun;
        int             max_lun;

        if ((SCpnt->cmnd[0] == MEGADEVIOC))
                return megadev_doioctl (megaCfg, SCpnt);

        if ((SCpnt->cmnd[0] == M_RD_IOCTL_CMD)
                    || (SCpnt->cmnd[0] == M_RD_IOCTL_CMD_NEW))
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0)  
                return mega_ioctl (megaCfg, SCpnt);     /* Handle IOCTL command */
#else
        {
                printk(KERN_WARNING "megaraid ioctl: older interface - "
                                "not supported.\n");
                return NULL;
        }
#endif

        islogical = ( (SCpnt->channel >= megaCfg->productInfo.SCSIChanPresent) &&
                                        (SCpnt->channel <= megaCfg->host->max_channel) );
#if 0
        islogical = (IS_RAID_CH(SCpnt->channel) && /* virtual ch is raid - AM */
                                                (SCpnt->channel == megaCfg->host->max_channel));
#endif

        if ( ! megaCfg->support_ext_cdb ) {
                if (!islogical && lun != 0) {
                        SCpnt->result = (DID_BAD_TARGET << 16);
                        callDone (SCpnt);
                        return NULL;
                }
        }

        if (!islogical && SCpnt->target == skip_id) {
                SCpnt->result = (DID_BAD_TARGET << 16);
                callDone (SCpnt);
                return NULL;
        }

        if (islogical) {

                /* have just LUN 0 for each target on virtual channels */
                if( SCpnt->lun != 0 ) {
                        SCpnt->result = (DID_BAD_TARGET << 16);
                        callDone (SCpnt);
                        return NULL;
                }

                lun = mega_get_lun(megaCfg, SCpnt);

            max_lun = (megaCfg->flag & BOARD_40LD) ?
                                                FC_MAX_LOGICAL_DRIVES : MAX_LOGICAL_DRIVES;

                 /*
                  * max_lun increases by 0x80 if some logical drive was deleted.
                  */
                if(megaCfg->read_ldidmap) {
                        max_lun += 0x80;
                }

                if( lun > max_lun ) {
                        SCpnt->result = (DID_BAD_TARGET << 16);
                        callDone (SCpnt);
                        return NULL;
                }

                /*
                 * If we have a logical drive with boot enabled, project it first
                 */
                if( megaCfg->boot_ldrv_enabled ) {
                        if( lun == 0 ) {
                                lun = megaCfg->boot_ldrv;
                        }
                        else {
                                if( lun <= megaCfg->boot_ldrv ) {
                                        lun--;
                                }
                        }
                }
        } else {
                if ( lun > 7) {
                                /* Do not support lun >7 for physically accessed devices */
                        SCpnt->result = (DID_BAD_TARGET << 16);
                        callDone (SCpnt);
                        return NULL;
                }
        }
        /*-----------------------------------------------------
         *
         *               Logical drive commands
         *
         *-----------------------------------------------------*/
        if (islogical) {
                switch (SCpnt->cmnd[0]) {
                case TEST_UNIT_READY:
                        memset (SCpnt->request_buffer, 0, SCpnt->request_bufflen);
                        SCpnt->result = (DID_OK << 16);
                        callDone (SCpnt);
                        return NULL;

                case MODE_SENSE:
                        memset (SCpnt->request_buffer, 0, SCpnt->cmnd[4]);
                        SCpnt->result = (DID_OK << 16);
                        callDone (SCpnt);
                        return NULL;

                case READ_CAPACITY:
                case INQUIRY:
                        /* Allocate a SCB and initialize passthru */
                        if ((pScb = mega_allocateSCB (megaCfg, SCpnt)) == NULL) {
                                SCpnt->result = (DID_ERROR << 16);
                                callDone (SCpnt);
                                return NULL;
                        }
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                        pthru = pScb->pthru;
#else
                        pthru = &pScb->pthru;
#endif

                        mbox = (mega_mailbox *) & pScb->mboxData;
                        memset (mbox, 0, sizeof (pScb->mboxData));
                        memset (pthru, 0, sizeof (mega_passthru));
                        pthru->timeout = 0;
                        pthru->ars = 1;
                        pthru->reqsenselen = 14;
                        pthru->islogical = 1;
                        pthru->logdrv = lun;
                        pthru->cdblen = SCpnt->cmd_len;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                        /*Not sure about the direction */
                        pScb->dma_direction = PCI_DMA_BIDIRECTIONAL;
                        pScb->dma_type = M_RD_PTHRU_WITH_BULK_DATA;

#if 0
/* Normal Code w/o the need for bounce buffer */
                        pScb->dma_h_bulkdata
                            = pci_map_single (megaCfg->dev,
                                              SCpnt->request_buffer,
                                              SCpnt->request_bufflen,
                                              pScb->dma_direction);

                        pthru->dataxferaddr = pScb->dma_h_bulkdata;
#else
/* Special Code to use bounce buffer for READ_CAPA/INQ */
                        pthru->dataxferaddr = pScb->dma_bounce_buffer;
                        pScb->dma_type = M_RD_DMA_TYPE_NONE;
#endif

#else
                        pthru->dataxferaddr =
                            virt_to_bus (SCpnt->request_buffer);
#endif

                        pthru->dataxferlen = SCpnt->request_bufflen;
                        memcpy (pthru->cdb, SCpnt->cmnd, SCpnt->cmd_len);

                        /* Initialize mailbox area */
                        mbox->cmd = MEGA_MBOXCMD_PASSTHRU;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                        mbox->xferaddr = pScb->dma_passthruhandle64;
                        TRACE1 (("M_RD_PTHRU_WITH_BULK_DATA Enabled \n"));
#else
                        mbox->xferaddr = virt_to_bus (pthru);
#endif
                        return pScb;

                case READ_6:
                case WRITE_6:
                case READ_10:
                case WRITE_10:
                        /* Allocate a SCB and initialize mailbox */
                        if ((pScb = mega_allocateSCB (megaCfg, SCpnt)) == NULL) {
                                SCpnt->result = (DID_ERROR << 16);
                                callDone (SCpnt);
                                return NULL;
                        }
                        mbox = (mega_mailbox *) & pScb->mboxData;

                        memset (mbox, 0, sizeof (pScb->mboxData));
                        mbox->logdrv = lun;

                        if (megaCfg->flag & BOARD_64BIT) {
                                mbox->cmd = (*SCpnt->cmnd == READ_6
                                             || *SCpnt->cmnd ==
                                             READ_10) ? MEGA_MBOXCMD_LREAD64 :
                                    MEGA_MBOXCMD_LWRITE64;
                        } else {
                                mbox->cmd = (*SCpnt->cmnd == READ_6
                                             || *SCpnt->cmnd ==
                                             READ_10) ? MEGA_MBOXCMD_LREAD :
                                    MEGA_MBOXCMD_LWRITE;
                        }

                        /* 6-byte */
                        if (*SCpnt->cmnd == READ_6 || *SCpnt->cmnd == WRITE_6) {
                                mbox->numsectors = (u32) SCpnt->cmnd[4];
                                mbox->lba =
                                    ((u32) SCpnt->cmnd[1] << 16) |
                                    ((u32) SCpnt->cmnd[2] << 8) |
                                    (u32) SCpnt->cmnd[3];
                                mbox->lba &= 0x1FFFFF;

                                if (*SCpnt->cmnd == READ_6) {
                                        megaCfg->nReads[(int) lun]++;
                                        megaCfg->nReadBlocks[(int) lun] +=
                                            mbox->numsectors;
                                } else {
                                        megaCfg->nWrites[(int) lun]++;
                                        megaCfg->nWriteBlocks[(int) lun] +=
                                            mbox->numsectors;
                                }
                        }

                        /* 10-byte */
                        if (*SCpnt->cmnd == READ_10 || *SCpnt->cmnd == WRITE_10) {
                                mbox->numsectors =
                                    (u32) SCpnt->cmnd[8] |
                                    ((u32) SCpnt->cmnd[7] << 8);
                                mbox->lba =
                                    ((u32) SCpnt->cmnd[2] << 24) |
                                    ((u32) SCpnt->cmnd[3] << 16) |
                                    ((u32) SCpnt->cmnd[4] << 8) |
                                    (u32) SCpnt->cmnd[5];

                                if (*SCpnt->cmnd == READ_10) {
                                        megaCfg->nReads[(int) lun]++;
                                        megaCfg->nReadBlocks[(int) lun] +=
                                            mbox->numsectors;
                                } else {
                                        megaCfg->nWrites[(int) lun]++;
                                        megaCfg->nWriteBlocks[(int) lun] +=
                                            mbox->numsectors;
                                }
                        }

                        /* 12-byte */
                        if (*SCpnt->cmnd == READ_12 || *SCpnt->cmnd == WRITE_12) {
                                mbox->lba =
                                    ((u32) SCpnt->cmnd[2] << 24) |
                                    ((u32) SCpnt->cmnd[3] << 16) |
                                    ((u32) SCpnt->cmnd[4] << 8) |
                                    (u32) SCpnt->cmnd[5];

                                mbox->numsectors =
                                    ((u32) SCpnt->cmnd[6] << 24) |
                                    ((u32) SCpnt->cmnd[7] << 16) |
                                    ((u32) SCpnt->cmnd[8] << 8) |
                                    (u32) SCpnt->cmnd[9];

                                if (*SCpnt->cmnd == READ_12) {
                                        megaCfg->nReads[(int) lun]++;
                                        megaCfg->nReadBlocks[(int) lun] +=
                                            mbox->numsectors;
                                } else {
                                        megaCfg->nWrites[(int) lun]++;
                                        megaCfg->nWriteBlocks[(int) lun] +=
                                            mbox->numsectors;
                                }
                        }

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                        if (*SCpnt->cmnd == READ_6 || *SCpnt->cmnd == READ_10
                                        || *SCpnt->cmnd == READ_12) {
                                pScb->dma_direction = PCI_DMA_FROMDEVICE;
                        } else {        /*WRITE_6 or WRITE_10 */
                                pScb->dma_direction = PCI_DMA_TODEVICE;
                        }
#endif

                        /* Calculate Scatter-Gather info */
                        mbox->numsgelements = mega_build_sglist (megaCfg, pScb,
                                                                 (u32 *)&mbox->xferaddr, (u32 *)&seg);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                        pScb->iDataSize = seg;

                        if (mbox->numsgelements) {
                                pScb->dma_type = M_RD_SGLIST_ONLY;
                                TRACE1 (("M_RD_SGLIST_ONLY Enabled \n"));
                        } else {
                                pScb->dma_type = M_RD_BULK_DATA_ONLY;
                                TRACE1 (("M_RD_BULK_DATA_ONLY Enabled \n"));
                        }
#endif

                        return pScb;
                default:
                        SCpnt->result = (DID_BAD_TARGET << 16);
                        callDone (SCpnt);
                        return NULL;
                }
        }
        /*-----------------------------------------------------
         *
         *               Passthru drive commands
         *
         *-----------------------------------------------------*/
        else {
                /* Allocate a SCB and initialize passthru */
                if ((pScb = mega_allocateSCB (megaCfg, SCpnt)) == NULL) {
                        SCpnt->result = (DID_ERROR << 16);
                        callDone (SCpnt);
                        return NULL;
                }

                mbox = (mega_mailbox *) pScb->mboxData;
                memset (mbox, 0, sizeof (pScb->mboxData));

                if ( megaCfg->support_ext_cdb && SCpnt->cmd_len > 10 ) {
                        epthru = mega_prepare_extpassthru(megaCfg, pScb, SCpnt);
                        mbox->cmd = MEGA_MBOXCMD_EXTPASSTHRU;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                        mbox->xferaddr = pScb->dma_ext_passthruhandle64;

                        if(epthru->numsgelements) {
                                pScb->dma_type = M_RD_PTHRU_WITH_SGLIST;
                        } else {
                                pScb->dma_type = M_RD_EPTHRU_WITH_BULK_DATA;
                        }
#else
                        mbox->xferaddr = virt_to_bus(epthru);
#endif
                }
                else {
                        pthru = mega_prepare_passthru(megaCfg, pScb, SCpnt);

                        /* Initialize mailbox */
                        mbox->cmd = MEGA_MBOXCMD_PASSTHRU;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                        mbox->xferaddr = pScb->dma_passthruhandle64;

                        if (pthru->numsgelements) {
                                pScb->dma_type = M_RD_PTHRU_WITH_SGLIST;
                        } else {
                                pScb->dma_type = M_RD_PTHRU_WITH_BULK_DATA;
                        }
#else
                        mbox->xferaddr = virt_to_bus(pthru);
#endif
                }
                return pScb;
        }
        return NULL;
}

static int
mega_get_lun(mega_host_config *this_hba, Scsi_Cmnd *sc)
{
        int             tgt;
        int             lun;
        int             virt_chan;

        tgt = sc->target;
        
        if ( tgt > 7 ) tgt--;   /* we do not get inquires for tgt 7 */

        virt_chan = sc->channel - this_hba->productInfo.SCSIChanPresent;
        lun = (virt_chan * 15) + tgt;

        /*
         * If "delete logical drive" feature is enabled on this controller.
         * Do only if at least one delete logical drive operation was done.
         *
         * Also, after logical drive deletion, instead of logical drive number,
         * the value returned should be 0x80+logical drive id.
         *
         * These is valid only for IO commands.
         */

         if( this_hba->support_random_del && this_hba->read_ldidmap ) {
                switch(sc->cmnd[0]) {
                case READ_6:    /* fall through */
                case WRITE_6:   /* fall through */
                case READ_10:   /* fall through */
                case WRITE_10:
                        lun += 0x80;
                }
         }

         return lun;
}


static mega_passthru *
mega_prepare_passthru(mega_host_config *megacfg, mega_scb *scb, Scsi_Cmnd *sc)
{
        mega_passthru *pthru;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        pthru = scb->pthru;
#else
        pthru = &scb->pthru;
#endif
        memset (pthru, 0, sizeof (mega_passthru));

        /* set adapter timeout value to 10 min. for tape drive  */
        /* 0=6sec/1=60sec/2=10min/3=3hrs                        */
        pthru->timeout = 2;
        pthru->ars = 1;
        pthru->reqsenselen = 14;
        pthru->islogical = 0;
        pthru->channel = (megacfg->flag & BOARD_40LD) ? 0 : sc->channel;
        pthru->target = (megacfg->flag & BOARD_40LD) ?
            (sc->channel << 4) | sc->target : sc->target;
        pthru->cdblen = sc->cmd_len;
        pthru->logdrv = sc->lun;

        memcpy (pthru->cdb, sc->cmnd, sc->cmd_len);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        /* Not sure about the direction */
        scb->dma_direction = PCI_DMA_BIDIRECTIONAL;

        /* Special Code for Handling READ_CAPA/ INQ using bounce buffers */
        switch (sc->cmnd[0]) {
        case INQUIRY:
        case READ_CAPACITY:
                pthru->numsgelements = 0;
                pthru->dataxferaddr = scb->dma_bounce_buffer;
                pthru->dataxferlen = sc->request_bufflen;
                break;
        default:
                pthru->numsgelements =
                        mega_build_sglist(
                                megacfg, scb, (u32 *)&pthru->dataxferaddr,
                                (u32 *)&pthru->dataxferlen
                        );
                break;
        }
#else
        pthru->numsgelements =
                mega_build_sglist(
                        megacfg, scb, (u32 *)&pthru->dataxferaddr,
                        (u32 *)&pthru->dataxferlen
                );
#endif
        return pthru;
}

static mega_ext_passthru *
mega_prepare_extpassthru(mega_host_config *megacfg, mega_scb *scb, Scsi_Cmnd *sc)
{
        mega_ext_passthru *epthru;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        epthru = scb->epthru;
#else
        epthru = &scb->epthru;
#endif
        memset(epthru, 0, sizeof(mega_ext_passthru));

        /* set adapter timeout value to 10 min. for tape drive  */
        /* 0=6sec/1=60sec/2=10min/3=3hrs                        */
        epthru->timeout = 2;
        epthru->ars = 1;
        epthru->reqsenselen = 14;
        epthru->islogical = 0;
        epthru->channel = (megacfg->flag & BOARD_40LD) ? 0 : sc->channel;
        epthru->target = (megacfg->flag & BOARD_40LD) ?
            (sc->channel << 4) | sc->target : sc->target;
        epthru->cdblen = sc->cmd_len;
        epthru->logdrv = sc->lun;

        memcpy(epthru->cdb, sc->cmnd, sc->cmd_len);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        /* Not sure about the direction */
        scb->dma_direction = PCI_DMA_BIDIRECTIONAL;

        /* Special Code for Handling READ_CAPA/ INQ using bounce buffers */
        switch (sc->cmnd[0]) {
        case INQUIRY:
        case READ_CAPACITY:
                epthru->numsgelements = 0;
                epthru->dataxferaddr = scb->dma_bounce_buffer;
                epthru->dataxferlen = sc->request_bufflen;
                break;
        default:
                epthru->numsgelements =
                        mega_build_sglist(
                                megacfg, scb, (u32 *)&epthru->dataxferaddr,
                                (u32 *)&epthru->dataxferlen
                        );
                break;
        }
#else
        epthru->numsgelements =
                mega_build_sglist(
                        megacfg, scb, (u32 *)&epthru->dataxferaddr,
                        (u32 *)&epthru->dataxferlen
                );
#endif
        return epthru;
}

/* Handle Driver Level IOCTLs
 * Return value of 0 indicates this function could not handle , so continue
 * processing
*/

static int mega_driver_ioctl (mega_host_config * megaCfg, Scsi_Cmnd * SCpnt)
{
        unsigned char *data = (unsigned char *) SCpnt->request_buffer;
        mega_driver_info driver_info;

        /* If this is not our command dont do anything */
        if (SCpnt->cmnd[0] != M_RD_DRIVER_IOCTL_INTERFACE)
                return 0;

        switch (SCpnt->cmnd[1]) {
        case GET_DRIVER_INFO:
                if (SCpnt->request_bufflen < sizeof (driver_info)) {
                        SCpnt->result = DID_BAD_TARGET << 16;
                        callDone (SCpnt);
                        return 1;
                }

                driver_info.size = sizeof (driver_info) - sizeof (int);
                driver_info.version = MEGARAID_IOCTL_VERSION;
                memcpy (data, &driver_info, sizeof (driver_info));
                break;
        default:
                SCpnt->result = DID_BAD_TARGET << 16;
        }

        callDone (SCpnt);
        return 1;
}

static inline void set_mbox_xfer_addr (mega_host_config * megaCfg, mega_scb * pScb,
                    mega_ioctl_mbox * mbox, u32 direction)
{

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        switch (direction) {
        case TO_DEVICE:
                pScb->dma_direction = PCI_DMA_TODEVICE;
                break;
        case FROM_DEVICE:
                pScb->dma_direction = PCI_DMA_FROMDEVICE;
                break;
        case FROMTO_DEVICE:
                pScb->dma_direction = PCI_DMA_BIDIRECTIONAL;
                break;
        }

        pScb->dma_h_bulkdata
            = pci_map_single (megaCfg->dev,
                              pScb->buff_ptr,
                              pScb->iDataSize, pScb->dma_direction);
        mbox->xferaddr = pScb->dma_h_bulkdata;
        pScb->dma_type = M_RD_BULK_DATA_ONLY;
        TRACE1 (("M_RD_BULK_DATA_ONLY Enabled \n"));
#else
        mbox->xferaddr = virt_to_bus (pScb->buff_ptr);
#endif
}

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0)

/*--------------------------------------------------------------------
 * build RAID commands for controller, passed down through ioctl()
 *--------------------------------------------------------------------*/
static mega_scb *mega_ioctl (mega_host_config * megaCfg, Scsi_Cmnd * SCpnt)
{
        mega_scb *pScb;
        mega_ioctl_mbox *mbox;
        mega_mailbox *mailbox;
        mega_passthru *pthru;
        u8 *mboxdata;
        long seg, i = 0;
        unsigned char *data = (unsigned char *) SCpnt->request_buffer;

        if ((pScb = mega_allocateSCB (megaCfg, SCpnt)) == NULL) {
                SCpnt->result = (DID_ERROR << 16);
                callDone (SCpnt);
                return NULL;
        }
        pthru = &pScb->pthru;

        mboxdata = (u8 *) & pScb->mboxData;
        mbox = (mega_ioctl_mbox *) & pScb->mboxData;
        mailbox = (mega_mailbox *) & pScb->mboxData;
        memset (mailbox, 0, sizeof (pScb->mboxData));

        if (data[0] == 0x03) {  /* passthrough command */
                unsigned char cdblen = data[2];
                memset (pthru, 0, sizeof (mega_passthru));
                pthru->islogical = (data[cdblen + 3] & 0x80) ? 1 : 0;
                pthru->timeout = data[cdblen + 3] & 0x07;
                pthru->reqsenselen = 14;
                pthru->ars = (data[cdblen + 3] & 0x08) ? 1 : 0;
                pthru->logdrv = data[cdblen + 4];
                pthru->channel = data[cdblen + 5];
                pthru->target = data[cdblen + 6];
                pthru->cdblen = cdblen;
                memcpy (pthru->cdb, &data[3], cdblen);

                mailbox->cmd = MEGA_MBOXCMD_PASSTHRU;


                pthru->numsgelements = mega_build_sglist (megaCfg, pScb,
                                                          (u32 *) & pthru->
                                                          dataxferaddr,
                                                          (u32 *) & pthru->
                                                          dataxferlen);

                mailbox->xferaddr = virt_to_bus (pthru);

                for (i = 0; i < (SCpnt->request_bufflen - cdblen - 7); i++) {
                        data[i] = data[i + cdblen + 7];
                }
                return pScb;
        }
        /* else normal (nonpassthru) command */

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,0,24) /*0x020024 */
        /*
         *usage of the function copy from user is used in case of data more than
         *4KB.This is used only with adapters which supports more than 8 logical
         * drives.This feature is disabled on kernels earlier or same as 2.0.36
         * as the uaccess.h file is not available with those kernels.
         */

        if (SCpnt->cmnd[0] == M_RD_IOCTL_CMD_NEW) {
                /* use external data area for large xfers  */
                /* If cmnd[0] is set to M_RD_IOCTL_CMD_NEW then *
                 *   cmnd[4..7] = external user buffer     *
                 *   cmnd[8..11] = length of buffer        *
                 *                                         */
        char *user_area = (char *)*((u32*)&SCpnt->cmnd[4]);
                u32 xfer_size = *((u32 *) & SCpnt->cmnd[8]);
                switch (data[0]) {
                case FW_FIRE_WRITE:
                case FW_FIRE_FLASH:
                        if ((ulong) user_area & (PAGE_SIZE - 1)) {
                                printk
                                    ("megaraid:user address not aligned on 4K boundary.Error.\n");
                                SCpnt->result = (DID_ERROR << 16);
                                callDone (SCpnt);
                                return NULL;
                        }
                        break;
                default:
                        break;
                }

                if (!(pScb->buff_ptr = kmalloc (xfer_size, GFP_KERNEL))) {
                        printk
                            ("megaraid: Insufficient mem for M_RD_IOCTL_CMD_NEW.\n");
                        SCpnt->result = (DID_ERROR << 16);
                        callDone (SCpnt);
                        return NULL;
                }

                copy_from_user (pScb->buff_ptr, user_area, xfer_size);
                pScb->iDataSize = xfer_size;

                switch (data[0]) {
                case DCMD_FC_CMD:
                        switch (data[1]) {
                        case DCMD_FC_READ_NVRAM_CONFIG:
                        case DCMD_GET_DISK_CONFIG:
                                {
                                        if ((ulong) pScb->
                                            buff_ptr & (PAGE_SIZE - 1)) {
                                                printk
                                                    ("megaraid:user address not sufficient Error.\n");
                                                SCpnt->result =
                                                    (DID_ERROR << 16);
                                                callDone (SCpnt);
                                                return NULL;
                                        }

                                        /*building SG list */
                                        mega_build_kernel_sg (pScb->buff_ptr,
                                                              xfer_size,
                                                              pScb, mbox);
                                        break;
                                }
                        default:
                                break;
                        }       /*switch (data[1]) */
                        break;
                }

        }
#endif

        mbox->cmd = data[0];
        mbox->channel = data[1];
        mbox->param = data[2];
        mbox->pad[0] = data[3];
        mbox->logdrv = data[4];

        if (SCpnt->cmnd[0] == M_RD_IOCTL_CMD_NEW) {
                switch (data[0]) {
                case FW_FIRE_WRITE:
                        mbox->cmd = FW_FIRE_WRITE;
                        mbox->channel = data[1];        /* Current Block Number */
                        set_mbox_xfer_addr (megaCfg, pScb, mbox, TO_DEVICE);
                        mbox->numsgelements = 0;
                        break;
                case FW_FIRE_FLASH:
                        mbox->cmd = FW_FIRE_FLASH;
                        mbox->channel = data[1] | 0x80; /* Origin */
                        set_mbox_xfer_addr (megaCfg, pScb, mbox, TO_DEVICE);
                        mbox->numsgelements = 0;
                        break;
                case DCMD_FC_CMD:
                        *(mboxdata + 0) = data[0];      /*mailbox byte 0: DCMD_FC_CMD */
                        *(mboxdata + 2) = data[1];      /*sub command */
                        switch (data[1]) {
                        case DCMD_FC_READ_NVRAM_CONFIG:
                        case DCMD_FC_READ_NVRAM_CONFIG_64:
                                /* number of elements in SG list */
                                *(mboxdata + 3) = mbox->numsgelements;
                                if (megaCfg->flag & BOARD_64BIT)
                                        *(mboxdata + 2) =
                                            DCMD_FC_READ_NVRAM_CONFIG_64;
                                break;
                        case DCMD_WRITE_CONFIG:
                        case DCMD_WRITE_CONFIG_64:
                                if (megaCfg->flag & BOARD_64BIT)
                                        *(mboxdata + 2) = DCMD_WRITE_CONFIG_64;
                                set_mbox_xfer_addr (megaCfg, pScb, mbox,
                                                    TO_DEVICE);
                                mbox->numsgelements = 0;
                                break;
                        case DCMD_GET_DISK_CONFIG:
                        case DCMD_GET_DISK_CONFIG_64:
                                if (megaCfg->flag & BOARD_64BIT)
                                        *(mboxdata + 2) =
                                            DCMD_GET_DISK_CONFIG_64;
                                *(mboxdata + 3) = data[2];      /*number of elements in SG list */
                                /*nr of elements in SG list */
                                *(mboxdata + 4) = mbox->numsgelements;
                                break;
                        case DCMD_DELETE_LOGDRV:
                        case DCMD_DELETE_DRIVEGROUP:
                        case NC_SUBOP_ENQUIRY3:
                                *(mboxdata + 3) = data[2];
                                set_mbox_xfer_addr (megaCfg, pScb, mbox,
                                                    FROMTO_DEVICE);
                                mbox->numsgelements = 0;
                                break;
                        case DCMD_CHANGE_LDNO:
                        case DCMD_CHANGE_LOOPID:
                                *(mboxdata + 3) = data[2];
                                *(mboxdata + 4) = data[3];
                                set_mbox_xfer_addr (megaCfg, pScb, mbox,
                                                    TO_DEVICE);
                                mbox->numsgelements = 0;
                                break;
                        default:
                                set_mbox_xfer_addr (megaCfg, pScb, mbox,
                                                    FROMTO_DEVICE);
                                mbox->numsgelements = 0;
                                break;
                        }       /*switch */
                        break;
                default:
                        set_mbox_xfer_addr (megaCfg, pScb, mbox, FROMTO_DEVICE);
                        mbox->numsgelements = 0;
                        break;
                }
        } else {

                mbox->numsgelements = mega_build_sglist (megaCfg, pScb,
                                                         (u32 *) & mbox->
                                                         xferaddr,
                                                         (u32 *) & seg);

                /* Handling some of the fw special commands */
                switch (data[0]) {
                case 6: /* START_DEV */
                        mbox->xferaddr = *((u32 *) & data[i + 6]);
                        break;
                default:
                        break;
                }

                for (i = 0; i < (SCpnt->request_bufflen - 6); i++) {
                        data[i] = data[i + 6];
                }
        }

        return (pScb);
}

static void mega_build_kernel_sg (char *barea, ulong xfersize, mega_scb * pScb, mega_ioctl_mbox * mbox)
{
        ulong i, buffer_area, len, end, end_page, x, idx = 0;

        buffer_area = (ulong) barea;
        i = buffer_area;
        end = buffer_area + xfersize;
        end_page = (end) & ~(PAGE_SIZE - 1);

        do {
                len = PAGE_SIZE - (i % PAGE_SIZE);
                x = pScb->sgList[idx].address =
                    virt_to_bus ((volatile void *) i);
                pScb->sgList[idx].length = len;
                i += len;
                idx++;
        } while (i < end_page);

        if ((end - i) < 0) {
                printk ("megaraid:Error in user address\n");
        }

        if (end - i) {
                pScb->sgList[idx].address = virt_to_bus ((volatile void *) i);
                pScb->sgList[idx].length = end - i;
                idx++;
        }
        mbox->xferaddr = virt_to_bus (pScb->sgList);
        mbox->numsgelements = idx;
}
#endif


#if DEBUG
static unsigned int cum_time = 0;
static unsigned int cum_time_cnt = 0;

static void showMbox (mega_scb * pScb)
{
        mega_mailbox *mbox;

        if (pScb == NULL)
                return;

        mbox = (mega_mailbox *) pScb->mboxData;
        printk ("%u cmd:%x id:%x #scts:%x lba:%x addr:%x logdrv:%x #sg:%x\n",
                pScb->SCpnt->pid,
                mbox->cmd, mbox->cmdid, mbox->numsectors,
                mbox->lba, mbox->xferaddr, mbox->logdrv, mbox->numsgelements);
}

#endif

/*--------------------------------------------------------------------
 * Interrupt service routine
 *--------------------------------------------------------------------*/
static void megaraid_isr (int irq, void *devp, struct pt_regs *regs)
{
        IO_LOCK_T;
        mega_host_config * megaCfg;
        u_char byte, idx, sIdx, tmpBox[MAILBOX_SIZE];
        u32 dword = 0;
        mega_mailbox *mbox;
        mega_scb *pScb;
        u_char qCnt, qStatus;
        u_char completed[MAX_FIRMWARE_STATUS];
        Scsi_Cmnd *SCpnt;

        megaCfg = (mega_host_config *) devp;
        mbox = (mega_mailbox *) tmpBox;

        if (megaCfg->host->irq == irq) {
                if (megaCfg->flag & IN_ISR) {
                        TRACE (("ISR called reentrantly!!\n"));
                        printk ("ISR called reentrantly!!\n");
                }
                megaCfg->flag |= IN_ISR;

                if (mega_busyWaitMbox (megaCfg)) {
                        printk (KERN_WARNING "Error: mailbox busy in isr!\n");
                }

                /* Check if a valid interrupt is pending */
                if (megaCfg->flag & BOARD_QUARTZ) {
                        dword = RDOUTDOOR (megaCfg);
                        if (dword != 0x10001234) {
                                /* Spurious interrupt */
                                megaCfg->flag &= ~IN_ISR;
                                return;
                        }
                } else {
                        byte = READ_PORT (megaCfg->host->io_port, INTR_PORT);
                        if ((byte & VALID_INTR_BYTE) == 0) {
                                /* Spurious interrupt */
                                megaCfg->flag &= ~IN_ISR;
                                return;
                        }
                        WRITE_PORT (megaCfg->host->io_port, INTR_PORT, byte);
                }

                for (idx = 0; idx < MAX_FIRMWARE_STATUS; idx++)
                        completed[idx] = 0;

                IO_LOCK(megaCfg->host);

                megaCfg->nInterrupts++;
                qCnt = 0xff;
                while ((qCnt = megaCfg->mbox->numstatus) == 0xFF) ;

                qStatus = 0xff;
                while ((qStatus = megaCfg->mbox->status) == 0xFF) ;

                /* Get list of completed requests */
                for (idx = 0; idx < qCnt; idx++) {
                        while ((sIdx = megaCfg->mbox->completed[idx]) == 0xFF) {
                                printk ("p");
                        }
                        completed[idx] = sIdx;
                        sIdx = 0xFF;
                }

                if (megaCfg->flag & BOARD_QUARTZ) {
                        WROUTDOOR (megaCfg, dword);
                        /* Acknowledge interrupt */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                        /* In this case mbox contains physical address */
#if 0
                        WRINDOOR (megaCfg, megaCfg->adjdmahandle64 | 0x2);
#else
                        WRINDOOR (megaCfg, 0x2);
#endif

#else

#if 0
                        WRINDOOR (megaCfg, virt_to_bus (megaCfg->mbox) | 0x2);
#else
                        WRINDOOR (megaCfg, 0x2);
#endif

#endif

#if 0
                        while (RDINDOOR (megaCfg) & 0x02) ;
#endif
                } else {
                        CLEAR_INTR (megaCfg->host->io_port);
                }

#if DEBUG
                if (qCnt >= MAX_FIRMWARE_STATUS) {
                        printk ("megaraid_isr: cmplt=%d ", qCnt);
                }
#endif

                for (idx = 0; idx < qCnt; idx++) {
                        sIdx = completed[idx];
                        if ((sIdx > 0) && (sIdx <= MAX_COMMANDS)) {
                                pScb = &megaCfg->scbList[sIdx - 1];

                                /* ASSERT(pScb->state == SCB_ISSUED); */

#if DEBUG
                                if (((jiffies) - pScb->isrcount) > maxCmdTime) {
                                        maxCmdTime = (jiffies) - pScb->isrcount;
                                        printk
                                            ("megaraid_isr : cmd time = %u\n",
                                             maxCmdTime);
                                }
#endif
                                /*
                                 * Assuming that the scsi command, for which 
                                 * an abort request was received earlier, has 
                                 * completed.
                                 */
                                if (pScb->state == SCB_ABORTED) {
                                        SCpnt = pScb->SCpnt;
                                }
                                if (pScb->state == SCB_RESET) {
                                        SCpnt = pScb->SCpnt;
                                        mega_freeSCB (megaCfg, pScb);
                                        SCpnt->result = (DID_RESET << 16);
                                        if (megaCfg->qCompletedH == NULL) {
                                                megaCfg->qCompletedH =
                                                    megaCfg->qCompletedT =
                                                    SCpnt;
                                        } else {
                                                megaCfg->qCompletedT->
                                                    host_scribble =
                                                    (unsigned char *) SCpnt;
                                                megaCfg->qCompletedT = SCpnt;
                                        }
                                        megaCfg->qCompletedT->host_scribble =
                                            (unsigned char *) NULL;
                                        megaCfg->qCcnt++;
                                        continue;
                                }

                                /* We don't want the ISR routine to touch M_RD_IOCTL_CMD_NEW commands, so
                                 * don't mark them as complete, instead we pop their semaphore so
                                 * that the queue routine can finish them off
                                 */
                                if (pScb->SCpnt->cmnd[0] == M_RD_IOCTL_CMD_NEW) {
                                        /* save the status byte for the queue routine to use */
                                        pScb->SCpnt->result = qStatus;
                                        up (&pScb->ioctl_sem);
                                } else {
                                        /* Mark command as completed */
                                        mega_cmd_done (megaCfg, pScb, qStatus);
                                }
                        } else {
                                printk
                                    ("megaraid: wrong cmd id completed from firmware:id=%x\n",
                                     sIdx);
                        }
                }

                mega_rundoneq (megaCfg);

                megaCfg->flag &= ~IN_ISR;
                /* Loop through any pending requests */
                mega_runpendq (megaCfg);
                IO_UNLOCK(megaCfg->host);

        }

}

/*==================================================*/
/* Wait until the controller's mailbox is available */
/*==================================================*/

static int mega_busyWaitMbox (mega_host_config * megaCfg)
{
        mega_mailbox *mbox = (mega_mailbox *) megaCfg->mbox;
        long counter;

        for (counter = 0; counter < 10000; counter++) {
                if (!mbox->busy) {
                        return 0;
                }
                udelay (100);
                barrier ();
        }
        return -1;              /* give up after 1 second */
}

/*=====================================================
 * Post a command to the card
 *
 * Arguments:
 *   mega_host_config *megaCfg - Controller structure
 *   u_char *mboxData - Mailbox area, 16 bytes
 *   mega_scb *pScb   - SCB posting (or NULL if N/A)
 *   int intr         - if 1, interrupt, 0 is blocking
 * Return Value: (added on 7/26 for 40ld/64bit)
 *   -1: the command was not actually issued out
 *   other cases:
 *     intr==0, return ScsiStatus, i.e. mbox->status
 *     intr==1, return 0
 *=====================================================
 */
static int megaIssueCmd (mega_host_config * megaCfg, u_char * mboxData, 
                mega_scb * pScb, int intr)
{
        volatile mega_mailbox *mbox = (mega_mailbox *) megaCfg->mbox;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        volatile mega_mailbox64 *mbox64 = (mega_mailbox64 *) megaCfg->mbox64;
#endif

        u_char byte;

#ifdef __LP64__
        u64 phys_mbox;
#else
        u32 phys_mbox;
#endif
        u8 retval = -1;

        mboxData[0x1] = (pScb ? pScb->idx + 1 : 0xFE);  /* Set cmdid */
        mboxData[0xF] = 1;      /* Set busy */

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        /* In this case mbox contains physical address */
        phys_mbox = megaCfg->adjdmahandle64;
#else
        phys_mbox = virt_to_bus (megaCfg->mbox);
#endif

#if DEBUG
        ShowMbox (pScb);
#endif

        /* Wait until mailbox is free */
        if (mega_busyWaitMbox (megaCfg)) {
                printk ("Blocked mailbox......!!\n");
                udelay (1000);

#if DEBUG
                showMbox (pLastScb);
#endif

                /* Abort command */
                if (pScb == NULL) {
                        TRACE (("NULL pScb in megaIssue\n"));
                        printk ("NULL pScb in megaIssue\n");
                }
                mega_cmd_done (megaCfg, pScb, 0x08);
                return -1;
        }

        pLastScb = pScb;

        /* Copy mailbox data into host structure */
        megaCfg->mbox64->xferSegment_lo = 0;
        megaCfg->mbox64->xferSegment_hi = 0;

        memcpy ((char *) mbox, mboxData, 16);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        switch (mboxData[0]) {
        case MEGA_MBOXCMD_LREAD64:
        case MEGA_MBOXCMD_LWRITE64:
                mbox64->xferSegment_lo = mbox->xferaddr;
                mbox64->xferSegment_hi = 0;
                mbox->xferaddr = 0xFFFFFFFF;
                break;
        }
#endif

        /* Kick IO */
        if (intr) {
                /* Issue interrupt (non-blocking) command */
                if (megaCfg->flag & BOARD_QUARTZ) {
                        mbox->mraid_poll = 0;
                        mbox->mraid_ack = 0;

                        WRINDOOR (megaCfg, phys_mbox | 0x1);
                } else {
                        ENABLE_INTR (megaCfg->host->io_port);
                        ISSUE_COMMAND (megaCfg->host->io_port);
                }
                pScb->state = SCB_ISSUED;

                retval = 0;
        } else {                /* Issue non-ISR (blocking) command */
                disable_irq (megaCfg->host->irq);
                if (megaCfg->flag & BOARD_QUARTZ) {
                        mbox->mraid_poll = 0;
                        mbox->mraid_ack = 0;
                        mbox->numstatus = 0xFF;
                        mbox->status = 0xFF;
                        WRINDOOR (megaCfg, phys_mbox | 0x1);

                        while (mbox->numstatus == 0xFF) ;
                        while (mbox->status == 0xFF) ;
                        while (mbox->mraid_poll != 0x77) ;
                        mbox->mraid_poll = 0;
                        mbox->mraid_ack = 0x77;

                        /* while ((cmdDone = RDOUTDOOR (megaCfg)) != 0x10001234);
                           WROUTDOOR (megaCfg, cmdDone); */

                        if (pScb) {
                                mega_cmd_done (megaCfg, pScb, mbox->status);
                        }

                        WRINDOOR (megaCfg, phys_mbox | 0x2);
                        while (RDINDOOR (megaCfg) & 0x2) ;

                } else {
                        DISABLE_INTR (megaCfg->host->io_port);
                        ISSUE_COMMAND (megaCfg->host->io_port);

                        while (!
                               ((byte =
                                 READ_PORT (megaCfg->host->io_port,
                                            INTR_PORT)) & INTR_VALID)) ;
                        WRITE_PORT (megaCfg->host->io_port, INTR_PORT, byte);

                        ENABLE_INTR (megaCfg->host->io_port);
                        CLEAR_INTR (megaCfg->host->io_port);

                        if (pScb) {
                                mega_cmd_done (megaCfg, pScb, mbox->status);
                        } else {
                                TRACE (("Error: NULL pScb!\n"));
                        }
                }
                enable_irq (megaCfg->host->irq);
                retval = mbox->status;
        }
#if DEBUG
        while (mega_busyWaitMbox (megaCfg)) {
                printk(KERN_ERR "Blocked mailbox on exit......!\n");
                udelay (1000);
        }
#endif

        return retval;
}

/*-------------------------------------------------------------------
 * Copies data to SGLIST
 *-------------------------------------------------------------------*/
/* Note:
        For 64 bit cards, we need a minimum of one SG element for read/write
*/

static int
mega_build_sglist (mega_host_config * megaCfg, mega_scb * scb,
                   u32 * buffer, u32 * length)
{
        struct scatterlist *sgList;
        int idx;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        int sgcnt;
#endif

        mega_mailbox *mbox = NULL;

        mbox = (mega_mailbox *) scb->mboxData;
        /* Scatter-gather not used */
        if (scb->SCpnt->use_sg == 0) {

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                scb->dma_h_bulkdata = pci_map_single (megaCfg->dev,
                                      scb->SCpnt->request_buffer,
                                      scb->SCpnt->request_bufflen,
                                      scb->dma_direction);
                /* We need to handle special commands like READ64, WRITE64
                   as they need a minimum of 1 SG irrespective of actually SG
                 */
                if ((megaCfg->flag & BOARD_64BIT) &&
                    ((mbox->cmd == MEGA_MBOXCMD_LREAD64) ||
                     (mbox->cmd == MEGA_MBOXCMD_LWRITE64))) {
                        scb->sg64List[0].address = scb->dma_h_bulkdata;
                        scb->sg64List[0].length = scb->SCpnt->request_bufflen;
                        *buffer = scb->dma_sghandle64;
                        *length = 0;
                        scb->sglist_count = 1;
                        return 1;
                } else {
                        *buffer = scb->dma_h_bulkdata;
                        *length = (u32) scb->SCpnt->request_bufflen;
                }
#else
                *buffer = virt_to_bus (scb->SCpnt->request_buffer);
                *length = (u32) scb->SCpnt->request_bufflen;
#endif
                return 0;
        }

        sgList = (struct scatterlist *) scb->SCpnt->request_buffer;
#if 0
        if (scb->SCpnt->use_sg == 1) {

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                scb->dma_h_bulkdata = pci_map_single (megaCfg->dev,
                                      sgList[0].address,
                                      sgList[0].length, scb->dma_direction);

                if ((megaCfg->flag & BOARD_64BIT) &&
                    ((mbox->cmd == MEGA_MBOXCMD_LREAD64) ||
                     (mbox->cmd == MEGA_MBOXCMD_LWRITE64))) {
                        scb->sg64List[0].address = scb->dma_h_bulkdata;
                        scb->sg64List[0].length = scb->SCpnt->request_bufflen;
                        *buffer = scb->dma_sghandle64;
                        *length = 0;
                        scb->sglist_count = 1;
                        return 1;
                } else {
                        *buffer = scb->dma_h_bulkdata;
                        *length = (u32) sgList[0].length;
                }
#else
                *buffer = virt_to_bus (sgList[0].address);
                *length = (u32) sgList[0].length;
#endif

                return 0;
        }
#endif
        /* Copy Scatter-Gather list info into controller structure */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        sgcnt = pci_map_sg (megaCfg->dev,
                            sgList, scb->SCpnt->use_sg, scb->dma_direction);

        /* Determine the validity of the new count  */
        if (sgcnt == 0)
                printk ("pci_map_sg returned zero!!! ");

        for (idx = 0; idx < sgcnt; idx++, sgList++) {

                if ((megaCfg->flag & BOARD_64BIT) &&
                    ((mbox->cmd == MEGA_MBOXCMD_LREAD64) ||
                     (mbox->cmd == MEGA_MBOXCMD_LWRITE64))) {
                        scb->sg64List[idx].address = sg_dma_address (sgList);
                        scb->sg64List[idx].length = sg_dma_len (sgList);
                } else {
                        scb->sgList[idx].address = sg_dma_address (sgList);
                        scb->sgList[idx].length = sg_dma_len (sgList);
                }

        }

#else
        for (idx = 0; idx < scb->SCpnt->use_sg; idx++) {
                scb->sgList[idx].address = virt_to_bus (sgList[idx].address);
                scb->sgList[idx].length = (u32) sgList[idx].length;
        }
#endif

        /* Reset pointer and length fields */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        *buffer = scb->dma_sghandle64;
        scb->sglist_count = scb->SCpnt->use_sg;
#else
        *buffer = virt_to_bus (scb->sgList);
#endif
        *length = 0;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        /* Return count of SG requests */
        return sgcnt;
#else
        /* Return count of SG requests */
        return scb->SCpnt->use_sg;
#endif
}

/*--------------------------------------------------------------------
 * Initializes the address of the controller's mailbox register
 *  The mailbox register is used to issue commands to the card.
 *  Format of the mailbox area:
 *   00 01 command
 *   01 01 command id
 *   02 02 # of sectors
 *   04 04 logical bus address
 *   08 04 physical buffer address
 *   0C 01 logical drive #
 *   0D 01 length of scatter/gather list
 *   0E 01 reserved
 *   0F 01 mailbox busy
 *   10 01 numstatus byte
 *   11 01 status byte
 *--------------------------------------------------------------------*/
static int
mega_register_mailbox (mega_host_config * megaCfg, u32 paddr)
{
        /* align on 16-byte boundary */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        megaCfg->mbox = &megaCfg->mailbox64ptr->mailbox;
#else
        megaCfg->mbox = &megaCfg->mailbox64.mailbox;
#endif

#ifdef __LP64__
        megaCfg->mbox = (mega_mailbox *) ((((u64) megaCfg->mbox) + 16) & ((u64) (-1) ^ 0x0F));
        megaCfg->adjdmahandle64 = (megaCfg->dma_handle64 + 16) & ((u64) (-1) ^ 0x0F);
        megaCfg->mbox64 = (mega_mailbox64 *) ((u_char *) megaCfg->mbox - sizeof (u64));
        paddr = (paddr + 4 + 16) & ((u64) (-1) ^ 0x0F);
#else
        megaCfg->mbox
            = (mega_mailbox *) ((((u32) megaCfg->mbox) + 16) & 0xFFFFFFF0);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        megaCfg->adjdmahandle64 = ((megaCfg->dma_handle64 + 16) & 0xFFFFFFF0);
#endif

        megaCfg->mbox64 = (mega_mailbox64 *) ((u_char *) megaCfg->mbox - 8);
        paddr = (paddr + 4 + 16) & 0xFFFFFFF0;
#endif

        /* Register mailbox area with the firmware */
        if (!(megaCfg->flag & BOARD_QUARTZ)) {
                WRITE_PORT (megaCfg->host->io_port, MBOX_PORT0, paddr & 0xFF);
                WRITE_PORT (megaCfg->host->io_port, MBOX_PORT1,
                            (paddr >> 8) & 0xFF);
                WRITE_PORT (megaCfg->host->io_port, MBOX_PORT2,
                            (paddr >> 16) & 0xFF);
                WRITE_PORT (megaCfg->host->io_port, MBOX_PORT3,
                            (paddr >> 24) & 0xFF);
                WRITE_PORT (megaCfg->host->io_port, ENABLE_MBOX_REGION,
                            ENABLE_MBOX_BYTE);

                CLEAR_INTR (megaCfg->host->io_port);
                ENABLE_INTR (megaCfg->host->io_port);
        }
        return 0;
}

/*---------------------------------------------------------------------------
 * mega_Convert8ldTo40ld() -- takes all info in AdapterInquiry structure and
 * puts it into ProductInfo and Enquiry3 structures for later use
 *---------------------------------------------------------------------------*/
static void mega_Convert8ldTo40ld (mega_RAIDINQ * inquiry,
                       mega_Enquiry3 * enquiry3,
                       megaRaidProductInfo * productInfo)
{
        int i;

        productInfo->MaxConcCmds = inquiry->AdpInfo.MaxConcCmds;
        enquiry3->rbldRate = inquiry->AdpInfo.RbldRate;
        productInfo->SCSIChanPresent = inquiry->AdpInfo.ChanPresent;

        for (i = 0; i < 4; i++) {
                productInfo->FwVer[i] = inquiry->AdpInfo.FwVer[i];
                productInfo->BiosVer[i] = inquiry->AdpInfo.BiosVer[i];
        }
        enquiry3->cacheFlushInterval = inquiry->AdpInfo.CacheFlushInterval;
        productInfo->DramSize = inquiry->AdpInfo.DramSize;

        enquiry3->numLDrv = inquiry->LogdrvInfo.NumLDrv;

        for (i = 0; i < MAX_LOGICAL_DRIVES; i++) {
                enquiry3->lDrvSize[i] = inquiry->LogdrvInfo.LDrvSize[i];
                enquiry3->lDrvProp[i] = inquiry->LogdrvInfo.LDrvProp[i];
                enquiry3->lDrvState[i]
                    = inquiry->LogdrvInfo.LDrvState[i];
        }

        for (i = 0; i < (MAX_PHYSICAL_DRIVES); i++) {
                enquiry3->pDrvState[i]
                    = inquiry->PhysdrvInfo.PDrvState[i];
        }
}

/*-------------------------------------------------------------------
 * Issue an adapter info query to the controller
 *-------------------------------------------------------------------*/
static int mega_i_query_adapter (mega_host_config * megaCfg)
{
        mega_Enquiry3 *enquiry3Pnt;
        mega_mailbox *mbox;
        u_char mboxData[16];

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        dma_addr_t raid_inq_dma_handle = 0, prod_info_dma_handle = 0, enquiry3_dma_handle = 0;
#endif
        u8 retval;

        /* Initialize adapter inquiry mailbox */

        mbox = (mega_mailbox *) mboxData;

        memset ((void *) megaCfg->mega_buffer, 0,
                sizeof (megaCfg->mega_buffer));
        memset (mbox, 0, 16);

/*
 * Try to issue Enquiry3 command
 * if not succeeded, then issue MEGA_MBOXCMD_ADAPTERINQ command and
 * update enquiry3 structure
 */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        enquiry3_dma_handle = pci_map_single (megaCfg->dev,
                              (void *) megaCfg->mega_buffer,
                              (2 * 1024L), PCI_DMA_FROMDEVICE);

        mbox->xferaddr = enquiry3_dma_handle;
#else
        /*Taken care */
        mbox->xferaddr = virt_to_bus ((void *) megaCfg->mega_buffer);
#endif

        /* Initialize mailbox databuffer addr */
        enquiry3Pnt = (mega_Enquiry3 *) megaCfg->mega_buffer;
        /* point mega_Enguiry3 to the data buf */

        mboxData[0] = FC_NEW_CONFIG;    /* i.e. mbox->cmd=0xA1 */
        mboxData[2] = NC_SUBOP_ENQUIRY3;        /* i.e. 0x0F */
        mboxData[3] = ENQ3_GET_SOLICITED_FULL;  /* i.e. 0x02 */

        /* Issue a blocking command to the card */
        if ((retval = megaIssueCmd (megaCfg, mboxData, NULL, 0)) != 0) {        /* the adapter does not support 40ld */
                mega_RAIDINQ adapterInquiryData;
                mega_RAIDINQ *adapterInquiryPnt = &adapterInquiryData;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                raid_inq_dma_handle = pci_map_single (megaCfg->dev,
                                      (void *) adapterInquiryPnt,
                                      sizeof (mega_RAIDINQ),
                                      PCI_DMA_FROMDEVICE);
                mbox->xferaddr = raid_inq_dma_handle;
#else
                /*taken care */
                mbox->xferaddr = virt_to_bus ((void *) adapterInquiryPnt);
#endif

                mbox->cmd = MEGA_MBOXCMD_ADAPTERINQ;    /*issue old 0x05 command to adapter */
                /* Issue a blocking command to the card */ ;
                retval = megaIssueCmd (megaCfg, mboxData, NULL, 0);

                pci_unmap_single (megaCfg->dev,
                                  raid_inq_dma_handle,
                                  sizeof (mega_RAIDINQ), PCI_DMA_FROMDEVICE);

                /*update Enquiry3 and ProductInfo structures with mega_RAIDINQ structure*/
                mega_Convert8ldTo40ld (adapterInquiryPnt,
                                       enquiry3Pnt,
                                       (megaRaidProductInfo *) & megaCfg->
                                       productInfo);

        } else {                /* adapter supports 40ld */
                megaCfg->flag |= BOARD_40LD;

                pci_unmap_single (megaCfg->dev,
                                  enquiry3_dma_handle,
                                  (2 * 1024L), PCI_DMA_FROMDEVICE);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
/*get productInfo, which is static information and will be unchanged*/
                prod_info_dma_handle
                    = pci_map_single (megaCfg->dev,
                                      (void *) &megaCfg->productInfo,
                                      sizeof (megaRaidProductInfo),
                                      PCI_DMA_FROMDEVICE);
                mbox->xferaddr = prod_info_dma_handle;
#else
                /*taken care */
                mbox->xferaddr = virt_to_bus ((void *) &megaCfg->productInfo);
#endif

                mboxData[0] = FC_NEW_CONFIG;    /* i.e. mbox->cmd=0xA1 */
                mboxData[2] = NC_SUBOP_PRODUCT_INFO;    /* i.e. 0x0E */

                if ((retval = megaIssueCmd (megaCfg, mboxData, NULL, 0)) != 0)
                        printk ("megaraid: Product_info cmd failed with error: %d\n",
                                retval);

                pci_unmap_single (megaCfg->dev,
                                  prod_info_dma_handle,
                                  sizeof (megaRaidProductInfo),
                                  PCI_DMA_FROMDEVICE);
        }

        /*
         * kernel scans the channels from 0 to <= max_channel
         */
        megaCfg->host->max_channel =
                megaCfg->productInfo.SCSIChanPresent + NVIRT_CHAN -1;

        megaCfg->host->max_id = 16;     /* max targets per channel */
        /*(megaCfg->flag & BOARD_40LD)?FC_MAX_TARGETS_PER_CHANNEL:MAX_TARGET+1; */
#if 0
        megaCfg->host->max_lun =        /* max lun */
            (megaCfg->flag & BOARD_40LD) ?
                        FC_MAX_LOGICAL_DRIVES : MAX_LOGICAL_DRIVES;
#endif
        megaCfg->host->max_lun = 7;     /* Upto 7 luns for non disk devices */

        megaCfg->host->cmd_per_lun = MAX_CMD_PER_LUN;

        megaCfg->numldrv = enquiry3Pnt->numLDrv;
        megaCfg->max_cmds = megaCfg->productInfo.MaxConcCmds;
        if (megaCfg->max_cmds > MAX_COMMANDS)
                megaCfg->max_cmds = MAX_COMMANDS - 1;

        megaCfg->host->can_queue = megaCfg->max_cmds - 1;

#if 0
        if (megaCfg->host->can_queue >= MAX_COMMANDS) {
                megaCfg->host->can_queue = MAX_COMMANDS - 16;
        }
#endif

        /* use HP firmware and bios version encoding */
        if (megaCfg->productInfo.subSystemVendorID == HP_SUBSYS_ID) {
                sprintf (megaCfg->fwVer, "%c%d%d.%d%d",
                         megaCfg->productInfo.FwVer[2],
                         megaCfg->productInfo.FwVer[1] >> 8,
                         megaCfg->productInfo.FwVer[1] & 0x0f,
                         megaCfg->productInfo.FwVer[0] >> 8,
                         megaCfg->productInfo.FwVer[0] & 0x0f);
                sprintf (megaCfg->biosVer, "%c%d%d.%d%d",
                         megaCfg->productInfo.BiosVer[2],
                         megaCfg->productInfo.BiosVer[1] >> 8,
                         megaCfg->productInfo.BiosVer[1] & 0x0f,
                         megaCfg->productInfo.BiosVer[0] >> 8,
                         megaCfg->productInfo.BiosVer[0] & 0x0f);
        } else {
                memcpy (megaCfg->fwVer, (char *) megaCfg->productInfo.FwVer, 4);
                megaCfg->fwVer[4] = 0;

                memcpy (megaCfg->biosVer, (char *) megaCfg->productInfo.BiosVer, 4);
                megaCfg->biosVer[4] = 0;
        }
        megaCfg->support_ext_cdb = mega_support_ext_cdb(megaCfg);

        printk (KERN_NOTICE "megaraid: [%s:%s] detected %d logical drives" M_RD_CRLFSTR,
                megaCfg->fwVer, megaCfg->biosVer, megaCfg->numldrv);

        if ( megaCfg->support_ext_cdb ) {
                printk(KERN_NOTICE "megaraid: supports extended CDBs.\n");
        }

        /*
         * I hope that I can unmap here, reason DMA transaction is not required any more
         * after this
         */

        return 0;
}

/*-------------------------------------------------------------------------
 *
 *                      Driver interface functions
 *
 *-------------------------------------------------------------------------*/

/*----------------------------------------------------------
 * Returns data to be displayed in /proc/scsi/megaraid/X
 *----------------------------------------------------------*/

int megaraid_proc_info (char *buffer, char **start, off_t offset,
                    int length, int host_no, int inout)
{
        *start = buffer;
        return 0;
}

static int mega_findCard (Scsi_Host_Template * pHostTmpl,
               u16 pciVendor, u16 pciDev, long flag)
{
        mega_host_config *megaCfg = NULL;
        struct Scsi_Host *host = NULL;
        u_char pciBus, pciDevFun, megaIrq;

        u16 magic;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        u32 magic64;
#endif

        int             i;

#ifdef __LP64__
        u64 megaBase;
#else
        u32 megaBase;
#endif

        u16 pciIdx = 0;
        u16 numFound = 0;
        u16 subsysid, subsysvid;

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)  /* 0x20100 */
        while (!pcibios_find_device
               (pciVendor, pciDev, pciIdx, &pciBus, &pciDevFun)) {
#else

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0)  /*0x20300 */
        struct pci_dev *pdev = NULL;
#else
        struct pci_dev *pdev = pci_devices;
#endif

        while ((pdev = pci_find_device (pciVendor, pciDev, pdev))) {
                if(pci_enable_device (pdev))
                        continue;
                pciBus = pdev->bus->number;
                pciDevFun = pdev->devfn;
#endif
                if ((flag & BOARD_QUARTZ) && (skip_id == -1)) {
                        pci_read_config_word (pdev, PCI_CONF_AMISIG, &magic);
                        if ((magic != AMI_SIGNATURE)
                            && (magic != AMI_SIGNATURE_471)) {
                                pciIdx++;
                                continue;       /* not an AMI board */
                        }
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                        pci_read_config_dword (pdev, PCI_CONF_AMISIG64, &magic64);

                        if (magic64 == AMI_64BIT_SIGNATURE)
                                flag |= BOARD_64BIT;
#endif
                }

                /* Hmmm...Should we not make this more modularized so that in future we dont add
                   for each firmware */

                if (flag & BOARD_QUARTZ) {
                        /* Check to see if this is a Dell PERC RAID controller model 466 */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)  /* 0x20100 */
                        pcibios_read_config_word (pciBus, pciDevFun,
                                                  PCI_SUBSYSTEM_VENDOR_ID,
                                                  &subsysvid);
                        pcibios_read_config_word (pciBus, pciDevFun,
                                                  PCI_SUBSYSTEM_ID, &subsysid);
#else
                        pci_read_config_word (pdev,
                                              PCI_SUBSYSTEM_VENDOR_ID,
                                              &subsysvid);
                        pci_read_config_word (pdev,
                                              PCI_SUBSYSTEM_ID, &subsysid);
#endif

#if 0
                        /*
                         * This routine is called with well know values and we
                         * should not be getting what we have not asked.
                         * Also, the check is not right. It should have been for
                         * pci_vendor_id not subsysvid - AM
                         */

                        /* If we dont detect this valid subsystem vendor id's 
                           we refuse to load the driver 
                           PART of PC200X compliance
                         */

                        if ((subsysvid != AMI_SUBSYS_ID)
                            && (subsysvid != DELL_SUBSYS_ID)
                            && (subsysvid != HP_SUBSYS_ID))
                                continue;
#endif
                }

                printk (KERN_NOTICE
                        "megaraid: found 0x%4.04x:0x%4.04x:idx %d:bus %d:slot %d:func %d\n",
                        pciVendor, pciDev, pciIdx, pciBus, PCI_SLOT (pciDevFun),
                        PCI_FUNC (pciDevFun));
                /* Read the base port and IRQ from PCI */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)  /* 0x20100 */
                pcibios_read_config_dword (pciBus, pciDevFun,
                                           PCI_BASE_ADDRESS_0,
                                           (u_int *) & megaBase);
                pcibios_read_config_byte (pciBus, pciDevFun,
                                          PCI_INTERRUPT_LINE, &megaIrq);
#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0)        /*0x20300 */
                megaBase = pdev->base_address[0];
                megaIrq = pdev->irq;
#else

                megaBase = pci_resource_start (pdev, 0);
                megaIrq = pdev->irq;
#endif

                pciIdx++;

                if (flag & BOARD_QUARTZ) {
                        megaBase &= PCI_BASE_ADDRESS_MEM_MASK;
                        megaBase = (long) ioremap (megaBase, 128);
                        if (!megaBase)
                                continue;
                } else {
                        megaBase &= PCI_BASE_ADDRESS_IO_MASK;
                        megaBase += 0x10;
                }

                /* Initialize SCSI Host structure */
                host = scsi_register (pHostTmpl, sizeof (mega_host_config));
                if (!host)
                        goto err_unmap;

                /*
                 * Comment the following initialization if you know 'max_sectors' is
                 * not defined for this kernel.
                 * This field was introduced in Linus's kernel 2.4.7pre3 and it
                 * greatly increases the IO performance - AM
                 */
                host->max_sectors = 1024;

                scsi_set_pci_device(host, pdev);
                megaCfg = (mega_host_config *) host->hostdata;
                memset (megaCfg, 0, sizeof (mega_host_config));

                printk (KERN_NOTICE "scsi%d : Found a MegaRAID controller at 0x%x, IRQ: %d"
                        M_RD_CRLFSTR, host->host_no, (u_int) megaBase, megaIrq);

                if (flag & BOARD_64BIT)
                        printk (KERN_NOTICE "scsi%d : Enabling 64 bit support\n",
                                host->host_no);

                /* Copy resource info into structure */
                megaCfg->qCompletedH = NULL;
                megaCfg->qCompletedT = NULL;
                megaCfg->qPendingH = NULL;
                megaCfg->qPendingT = NULL;
                megaCfg->qFreeH = NULL;
                megaCfg->qFreeT = NULL;
                megaCfg->qFcnt = 0;
                megaCfg->qPcnt = 0;
                megaCfg->qCcnt = 0;
                megaCfg->lock_free = SPIN_LOCK_UNLOCKED;
                megaCfg->lock_pend = SPIN_LOCK_UNLOCKED;
                megaCfg->lock_scsicmd = SPIN_LOCK_UNLOCKED;
                megaCfg->flag = flag;
                megaCfg->int_qh = NULL;
                megaCfg->int_qt = NULL;
                megaCfg->int_qlen = 0;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                megaCfg->dev = pdev;
#endif
                megaCfg->host = host;
                megaCfg->base = megaBase;
                megaCfg->host->irq = megaIrq;

                megaCfg->host->io_port = megaBase;
                megaCfg->host->n_io_port = 16;
                megaCfg->host->unique_id = (pciBus << 8) | pciDevFun;
                megaCtlrs[numCtlrs] = megaCfg;

                if (!(flag & BOARD_QUARTZ)) {
                        /* Request our IO Range */
                        if (!request_region(megaBase, 16, "megaraid")) {
                                printk(KERN_WARNING "megaraid: Couldn't register I/O range!\n");
                                goto err_unregister;
                        }
                }

                /* Request our IRQ */
                if (request_irq (megaIrq, megaraid_isr, SA_SHIRQ,
                                 "megaraid", megaCfg)) {
                        printk (KERN_WARNING
                                "megaraid: Couldn't register IRQ %d!\n",
                                megaIrq);
                        goto err_release;
                }

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                /*
                 * unmap while releasing the driver, Is it required to be 
                 * PCI_DMA_BIDIRECTIONAL 
                */

                megaCfg->mailbox64ptr
                    = pci_alloc_consistent (megaCfg->dev,
                                            sizeof (mega_mailbox64),
                                            &(megaCfg->dma_handle64));

                mega_register_mailbox (megaCfg, megaCfg->dma_handle64);
#else
                mega_register_mailbox (megaCfg,
                                       virt_to_bus ((void *) &megaCfg->
                                                    mailbox64));
#endif

                mega_i_query_adapter (megaCfg);

                if ((subsysid == 0x1111) && (subsysvid == 0x1111)) {

                        /*
                         * Which firmware
                         */
                        if( strcmp(megaCfg->fwVer, "3.00") == 0 ||
                                        strcmp(megaCfg->fwVer, "3.01") == 0 ) {

                                printk( KERN_WARNING
                                        "megaraid: Your  card is a Dell PERC 2/SC RAID controller "
                                        "with  firmware\nmegaraid: 3.00 or 3.01.  This driver is "
                                        "known to have corruption issues\nmegaraid: with those "
                                        "firmware versions on this specific card.  In order\n"
                                        "megaraid: to protect your data, please upgrade your "
                                        "firmware to version\nmegaraid: 3.10 or later, available "
                                        "from the Dell Technical Support web\nmegaraid: site at\n"
                                        "http://support.dell.com/us/en/filelib/download/"
                                        "index.asp?fileid=2940\n"
                                );
                        }
                }

                /*
                 * If we have a HP 1M(0x60E7)/2M(0x60E8) controller with
                 * firmware H.01.07 or H.01.08, disable 64 bit support,
                 * since this firmware cannot handle 64 bit addressing
                 */

                if( (subsysvid == HP_SUBSYS_ID) &&
                                ((subsysid == 0x60E7)||(subsysid == 0x60E8)) ) {

                        /*
                         * which firmware
                         */
                        if( strcmp(megaCfg->fwVer, "H01.07") == 0 ||
                                        strcmp(megaCfg->fwVer, "H01.08") == 0 ) {
                                printk(KERN_WARNING
                                                "megaraid: Firmware H.01.07 or H.01.08 on 1M/2M "
                                                "controllers\nmegaraid: do not support 64 bit "
                                                "addressing.\n"
                                                "megaraid: DISABLING 64 bit support.\n");
                                megaCfg->flag &= ~BOARD_64BIT;
                        }
                }

                if (mega_is_bios_enabled (megaCfg)) {
                        mega_hbas[numCtlrs].is_bios_enabled = 1;
                }

                /*
                 * Find out which channel is raid and which is scsi
                 */
                mega_enum_raid_scsi(megaCfg);
                for( i = 0; i < megaCfg->productInfo.SCSIChanPresent; i++ ) {
                        if(IS_RAID_CH(i))
                                printk(KERN_NOTICE"megaraid: channel[%d] is raid.\n", i+1);
                        else
                                printk(KERN_NOTICE"megaraid: channel[%d] is scsi.\n", i+1);
                }

                /*
                 * Find out if a logical drive is set as the boot drive. If there is
                 * one, will make that as the first logical drive.
                 */
                mega_get_boot_ldrv(megaCfg);

                mega_hbas[numCtlrs].hostdata_addr = megaCfg;

                /*
                 * Do we support random deletion and addition of logical drives
                 */
                megaCfg->read_ldidmap = 0;      /* set it after first logdrv delete cmd */
                megaCfg->support_random_del = mega_support_random_del(megaCfg);

                /* Initialize SCBs */
                if (mega_init_scb (megaCfg)) {
                        pci_free_consistent (megaCfg->dev,
                                             sizeof (mega_mailbox64),
                                             (void *) megaCfg->mailbox64ptr,
                                             megaCfg->dma_handle64);
                        scsi_unregister (host);
                        continue;
                }

                /*
                 * Fill in the structure which needs to be passed back to the
                 * application when it does an ioctl() for controller related
                 * information.
                 */

                i = numCtlrs;
                numCtlrs++;

                mcontroller[i].base = megaBase;
                mcontroller[i].irq = megaIrq;
                mcontroller[i].numldrv = megaCfg->numldrv;
                mcontroller[i].pcibus = pciBus;
                mcontroller[i].pcidev = pciDev;
                mcontroller[i].pcifun = PCI_FUNC (pciDevFun);
                mcontroller[i].pciid = pciIdx;
                mcontroller[i].pcivendor = pciVendor;
                mcontroller[i].pcislot = PCI_SLOT (pciDevFun);
                mcontroller[i].uid = (pciBus << 8) | pciDevFun;

                numFound++;

                /* Set the Mode of addressing to 64 bit */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
                if ((megaCfg->flag & BOARD_64BIT) && BITS_PER_LONG == 64)
#ifdef __LP64__
                        pdev->dma_mask = 0xffffffffffffffff;
#else
                        pdev->dma_mask = 0xffffffff;
#endif
#endif
                continue;
              err_release:
                if (flag & BOARD_QUARTZ)
                        release_region (megaBase, 16);
              err_unregister:
                scsi_unregister (host);
              err_unmap:
                if (flag & BOARD_QUARTZ)
                        iounmap ((void *) megaBase);
        }
        return numFound;
}

/*---------------------------------------------------------
 * Detects if a megaraid controller exists in this system
 *---------------------------------------------------------*/

int megaraid_detect (Scsi_Host_Template * pHostTmpl)
{
        int ctlridx = 0, count = 0;

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0)  /*0x20300 */
        pHostTmpl->proc_dir = &proc_scsi_megaraid;
#else
        pHostTmpl->proc_name = "megaraid";
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)  /* 0x20100 */
        if (!pcibios_present ()) {
                printk (KERN_WARNING "megaraid: PCI bios not present."
                        M_RD_CRLFSTR);
                return 0;
        }
#endif
        skip_id = -1;
        if (megaraid && !strncmp (megaraid, "skip", strlen ("skip"))) {
                if (megaraid[4] != '\0') {
                        skip_id = megaraid[4] - '0';
                        if (megaraid[5] != '\0') {
                                skip_id = (skip_id * 10) + (megaraid[5] - '0');
                        }
                }
                skip_id = (skip_id > 15) ? -1 : skip_id;
        }

        printk (KERN_NOTICE "megaraid: " MEGARAID_VERSION);

        memset (mega_hbas, 0, sizeof (mega_hbas));

        count += mega_findCard (pHostTmpl, PCI_VENDOR_ID_AMI,
                                PCI_DEVICE_ID_AMI_MEGARAID, 0);
        count += mega_findCard (pHostTmpl, PCI_VENDOR_ID_AMI,
                                PCI_DEVICE_ID_AMI_MEGARAID2, 0);
        count += mega_findCard (pHostTmpl, 0x8086,
                                PCI_DEVICE_ID_AMI_MEGARAID3, BOARD_QUARTZ);
        count += mega_findCard (pHostTmpl, PCI_VENDOR_ID_AMI,
                                PCI_DEVICE_ID_AMI_MEGARAID3, BOARD_QUARTZ);


#ifdef CONFIG_PROC_FS
        if (count) {
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0)  /*0x20300 */
                mega_proc_dir_entry = proc_mkdir ("megaraid", &proc_root);
#else
                mega_proc_dir_entry = create_proc_entry ("megaraid",
                                                         S_IFDIR | S_IRUGO |
                                                         S_IXUGO, &proc_root);
#endif
                if (!mega_proc_dir_entry)
                        printk ("megaraid: failed to create megaraid root\n");
                else
                        for (ctlridx = 0; ctlridx < count; ctlridx++)
                                mega_create_proc_entry (ctlridx,
                                                        mega_proc_dir_entry);
        }
#endif

        /*
         * Register the driver as a character device, for applications to access
         * it for ioctls.
         * Ideally, this should go in the init_module() routine, but since it is
         * hidden in the file "scsi_module.c" ( included in the end ), we define
         * it here
         * First argument (major) to register_chrdev implies a dynamic major
         * number allocation.
         */
        if (count) {
                major = register_chrdev (0, "megadev", &megadev_fops);

                /*
                 * Register the Shutdown Notification hook in kernel
                 */
                if (register_reboot_notifier (&mega_notifier)) {
                        printk ("MegaRAID Shutdown routine not registered!!\n");
                }

                init_MUTEX (&mimd_entry_mtx);
        }

        return count;
}

/*---------------------------------------------------------------------
 * Release the controller's resources
 *---------------------------------------------------------------------*/
int megaraid_release (struct Scsi_Host *pSHost)
{
        mega_host_config *megaCfg;
        mega_mailbox *mbox;
        u_char mboxData[16];
        int i;

        megaCfg = (mega_host_config *) pSHost->hostdata;
        mbox = (mega_mailbox *) mboxData;

        /* Flush cache to disk */
        memset (mbox, 0, 16);
        mboxData[0] = 0xA;

        free_irq (megaCfg->host->irq, megaCfg); /* Must be freed first, otherwise
                                                   extra interrupt is generated */

        /* Issue a blocking (interrupts disabled) command to the card */
        megaIssueCmd (megaCfg, mboxData, NULL, 0);

        /* Free our resources */
        if (megaCfg->flag & BOARD_QUARTZ) {
                iounmap ((void *) megaCfg->base);
        } else {
                release_region (megaCfg->host->io_port, 16);
        }

        mega_freeSgList (megaCfg);
        pci_free_consistent (megaCfg->dev,
                             sizeof (mega_mailbox64),
                             (void *) megaCfg->mailbox64ptr,
                             megaCfg->dma_handle64);

#ifdef CONFIG_PROC_FS
        if (megaCfg->controller_proc_dir_entry) {
                remove_proc_entry ("stat", megaCfg->controller_proc_dir_entry);
                remove_proc_entry ("status",
                                   megaCfg->controller_proc_dir_entry);
                remove_proc_entry ("config",
                                   megaCfg->controller_proc_dir_entry);
                remove_proc_entry ("mailbox",
                                   megaCfg->controller_proc_dir_entry);
                for (i = 0; i < numCtlrs; i++) {
                        char buf[12] = { 0 };
                        sprintf (buf, "%d", i);
                        remove_proc_entry (buf, mega_proc_dir_entry);
                }
                remove_proc_entry ("megaraid", &proc_root);
        }
#endif

        /*
         *      Release the controller memory. A word of warning this frees
         *      hostdata and that includes megaCfg-> so be careful what you
         *      dereference beyond this point
         */
         
        scsi_unregister (pSHost);

        /*
         * Unregister the character device interface to the driver. Ideally this
         * should have been done in cleanup_module routine. Since this is hidden
         * in file "scsi_module.c", we do it here.
         * major is the major number of the character device returned by call to
         * register_chrdev() routine.
         */

        unregister_chrdev (major, "megadev");
        unregister_reboot_notifier (&mega_notifier);

        return 0;
}

static int mega_is_bios_enabled (mega_host_config * megacfg)
{
        mega_mailbox *mboxpnt;
        unsigned char mbox[16];
        int ret;

        mboxpnt = (mega_mailbox *) mbox;

        memset (mbox, 0, sizeof (mbox));
        memset ((void *) megacfg->mega_buffer,
                0, sizeof (megacfg->mega_buffer));

        /*
         * issue command to find out if the BIOS is enabled for this controller
         */
        mbox[0] = IS_BIOS_ENABLED;
        mbox[2] = GET_BIOS;

        mboxpnt->xferaddr = virt_to_bus ((void *) megacfg->mega_buffer);

        ret = megaIssueCmd (megacfg, mbox, NULL, 0);

        return (*(char *) megacfg->mega_buffer);
}

/*
 * Find out what channels are RAID/SCSI
 */
void
mega_enum_raid_scsi(mega_host_config *megacfg)
{
        mega_mailbox *mboxp;
        unsigned char mbox[16];
        int             i;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        dma_addr_t      dma_handle;
#endif

        mboxp = (mega_mailbox *)mbox;

        memset(mbox, 0, sizeof(mbox));
        /*
         * issue command to find out what channels are raid/scsi
         */
        mbox[0] = CHNL_CLASS;
        mbox[2] = GET_CHNL_CLASS;

        memset((void *)megacfg->mega_buffer, 0, sizeof(megacfg->mega_buffer));

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        dma_handle = pci_map_single(megacfg->dev, (void *)megacfg->mega_buffer,
                              (2 * 1024L), PCI_DMA_FROMDEVICE);

        mboxp->xferaddr = dma_handle;
#else
        mboxp->xferaddr = virt_to_bus((void *)megacfg->mega_buffer);
#endif

        /*
         * Non-ROMB firware fail this command, so all channels
         * must be shown RAID
         */
        if( megaIssueCmd(megacfg, mbox, NULL, 0) == 0 ) {
                mega_ch_class = *((char *)megacfg->mega_buffer);

                for( i = 0; i < NVIRT_CHAN; i++ ) {
                        /* logical drives channel is RAID */
                        mega_ch_class |= (0x01 << (megacfg->productInfo.SCSIChanPresent+i));
                }
        }
        else {
                mega_ch_class = 0xFF;
        }


#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        pci_unmap_single(megacfg->dev, dma_handle,
                                  (2 * 1024L), PCI_DMA_FROMDEVICE);
#endif

}


/*
 * get the boot logical drive number if enabled
 */
void
mega_get_boot_ldrv(mega_host_config *megacfg)
{
        mega_mailbox *mboxp;
        unsigned char mbox[16];
        struct private_bios_data *prv_bios_data;
        u16             cksum = 0;
        char    *cksum_p;
        int             i;

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        dma_addr_t      dma_handle;
#endif

        mboxp = (mega_mailbox *)mbox;

        memset(mbox, 0, sizeof(mbox));

        mbox[0] = BIOS_PVT_DATA;
        mbox[2] = GET_BIOS_PVT_DATA;

        memset((void *)megacfg->mega_buffer, 0, sizeof(megacfg->mega_buffer));

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        dma_handle = pci_map_single(megacfg->dev, (void *)megacfg->mega_buffer,
                              (2 * 1024L), PCI_DMA_FROMDEVICE);

        mboxp->xferaddr = dma_handle;
#else
        mboxp->xferaddr = virt_to_bus((void *)megacfg->mega_buffer);
#endif

        megacfg->boot_ldrv_enabled = 0;
        megacfg->boot_ldrv = 0;
        if( megaIssueCmd(megacfg, mbox, NULL, 0) == 0 ) {

                prv_bios_data = (struct private_bios_data *)megacfg->mega_buffer;

                cksum = 0;
                cksum_p = (char *)prv_bios_data;
                for( i = 0; i < 14; i++ ) {
                        cksum += (u16)(*cksum_p++);
                }

                if( prv_bios_data->cksum == (u16)(0-cksum) ) {
                        megacfg->boot_ldrv_enabled = 1;
                        megacfg->boot_ldrv = prv_bios_data->boot_ldrv;
                }
        }

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
        pci_unmap_single(megacfg->dev, dma_handle,
                                  (2 * 1024L), PCI_DMA_FROMDEVICE);
#endif

}


static inline void mega_freeSgList (mega_host_config * megaCfg)
{
        int i;

        for (i = 0; i < megaCfg->max_cmds; i++) {
                if (megaCfg->scbList[i].sgList)
                        pci_free_consistent (megaCfg->dev,
                                             sizeof (mega_64sglist) *
                                             MAX_SGLIST,
                                             megaCfg->scbList[i].sgList,
                                             megaCfg->scbList[i].
                                             dma_sghandle64);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0)  /* 0x020400 */
                        kfree (megaCfg->scbList[i].sgList);     /* free sgList */
#endif
        }
}

/*----------------------------------------------
 * Get information about the card/driver
 *----------------------------------------------*/
const char *megaraid_info (struct Scsi_Host *pSHost)
{
        static char buffer[512];
        mega_host_config *megaCfg;

        megaCfg = (mega_host_config *) pSHost->hostdata;

        sprintf (buffer,
                 "LSI Logic MegaRAID %s %d commands %d targs %d chans %d luns",
                 megaCfg->fwVer, megaCfg->productInfo.MaxConcCmds,
                 megaCfg->host->max_id, megaCfg->host->max_channel,
                 megaCfg->host->max_lun);
        return buffer;
}

/*-----------------------------------------------------------------
 * Perform a SCSI command
 * Mailbox area:
 *   00 01 command
 *   01 01 command id
 *   02 02 # of sectors
 *   04 04 logical bus address
 *   08 04 physical buffer address
 *   0C 01 logical drive #
 *   0D 01 length of scatter/gather list
 *   0E 01 reserved
 *   0F 01 mailbox busy
 *   10 01 numstatus byte
 *   11 01 status byte
 *-----------------------------------------------------------------*/
int megaraid_queue (Scsi_Cmnd * SCpnt, void (*pktComp) (Scsi_Cmnd *))
{
        DRIVER_LOCK_T mega_host_config * megaCfg;
        mega_scb *pScb;
        char *user_area = NULL;

        megaCfg = (mega_host_config *) SCpnt->host->hostdata;
        DRIVER_LOCK (megaCfg);

        if (!(megaCfg->flag & (1L << SCpnt->channel))) {
                if (SCpnt->channel < megaCfg->productInfo.SCSIChanPresent)
                        printk ( KERN_NOTICE
                                "scsi%d: scanning channel %d for devices.\n",
                                megaCfg->host->host_no, SCpnt->channel);
                else
                        printk ( KERN_NOTICE
                                "scsi%d: scanning virtual channel %d for logical drives.\n",
                                megaCfg->host->host_no,
                                SCpnt->channel-megaCfg->productInfo.SCSIChanPresent+1);

                megaCfg->flag |= (1L << SCpnt->channel);
        }

        SCpnt->scsi_done = pktComp;

        if (mega_driver_ioctl (megaCfg, SCpnt))
                return 0;

        /* If driver in abort or reset.. cancel this command */
        if (megaCfg->flag & IN_ABORT) {
                SCpnt->result = (DID_ABORT << 16);
                /* Add Scsi_Command to end of completed queue */
                if (megaCfg->qCompletedH == NULL) {
                        megaCfg->qCompletedH = megaCfg->qCompletedT = SCpnt;
                } else {
                        megaCfg->qCompletedT->host_scribble =
                            (unsigned char *) SCpnt;
                        megaCfg->qCompletedT = SCpnt;
                }
                megaCfg->qCompletedT->host_scribble = (unsigned char *) NULL;
                megaCfg->qCcnt++;

                DRIVER_UNLOCK (megaCfg);
                return 0;
        } else if (megaCfg->flag & IN_RESET) {
                SCpnt->result = (DID_RESET << 16);
                /* Add Scsi_Command to end of completed queue */
                if (megaCfg->qCompletedH == NULL) {
                        megaCfg->qCompletedH = megaCfg->qCompletedT = SCpnt;
                } else {
                        megaCfg->qCompletedT->host_scribble =
                            (unsigned char *) SCpnt;
                        megaCfg->qCompletedT = SCpnt;
                }
                megaCfg->qCompletedT->host_scribble = (unsigned char *) NULL;
                megaCfg->qCcnt++;

                DRIVER_UNLOCK (megaCfg);
                return 0;
        }

        megaCfg->flag |= IN_QUEUE;
        /* Allocate and build a SCB request */
        if ((pScb = mega_build_cmd (megaCfg, SCpnt)) != NULL) {

                /*
                 * Check if the HBA is in quiescent state, e.g., during a delete
                 * logical drive opertion. If it is, queue the commands in the
                 * internal queue until the delete operation is complete.
                 */
                if( ! megaCfg->quiescent ) {
                        /* Add SCB to the head of the pending queue */
                        if (megaCfg->qPendingH == NULL) {
                                megaCfg->qPendingH = megaCfg->qPendingT = pScb;
                        } else {
                                megaCfg->qPendingT->next = pScb;
                                megaCfg->qPendingT = pScb;
                        }
                        megaCfg->qPendingT->next = NULL;
                        megaCfg->qPcnt++;

                        if (mega_runpendq (megaCfg) == -1) {
                                DRIVER_UNLOCK (megaCfg);
                                return 0;
                        }
                }
                else {
                        /* Add SCB to the internal queue */
                        if (megaCfg->int_qh == NULL) {
                                megaCfg->int_qh = megaCfg->int_qt = pScb;
                        } else {
                                megaCfg->int_qt->next = pScb;
                                megaCfg->int_qt = pScb;
                        }
                        megaCfg->int_qt->next = NULL;
                        megaCfg->int_qlen++;
                }

                if (pScb->SCpnt->cmnd[0] == M_RD_IOCTL_CMD_NEW) {
                        init_MUTEX_LOCKED (&pScb->ioctl_sem);
                        IO_UNLOCK_IRQ(megaCfg->host);
                        down (&pScb->ioctl_sem);
                user_area = (char *)*((u32*)&pScb->SCpnt->cmnd[4]);
                        if (copy_to_user
                            (user_area, pScb->buff_ptr, pScb->iDataSize)) {
                                printk
                                    ("megaraid: Error copying ioctl return value to user buffer.\n");
                                pScb->SCpnt->result = (DID_ERROR << 16);
                        }
                    IO_LOCK_IRQ(megaCfg->host);
                        DRIVER_LOCK (megaCfg);
                        kfree (pScb->buff_ptr);
                        pScb->buff_ptr = NULL;
                        mega_cmd_done (megaCfg, pScb, pScb->SCpnt->result);
                        mega_rundoneq (megaCfg);
                        mega_runpendq (megaCfg);
                        DRIVER_UNLOCK (megaCfg);
                }

                megaCfg->flag &= ~IN_QUEUE;

        }

        DRIVER_UNLOCK (megaCfg);
        return 0;
}

/*----------------------------------------------------------------------
 * Issue a blocking command to the controller
 *----------------------------------------------------------------------*/
volatile static int internal_done_flag = 0;
volatile static int internal_done_errcode = 0;

static DECLARE_WAIT_QUEUE_HEAD (internal_wait);

static void internal_done (Scsi_Cmnd * SCpnt)
{
        internal_done_errcode = SCpnt->result;
        internal_done_flag++;
        wake_up (&internal_wait);
}

/* shouldn't be used, but included for completeness */

int megaraid_command (Scsi_Cmnd * SCpnt)
{
        internal_done_flag = 0;

        /* Queue command, and wait until it has completed */
        megaraid_queue (SCpnt, internal_done);

        while (!internal_done_flag) {
                interruptible_sleep_on (&internal_wait);
        }

        return internal_done_errcode;
}

/*---------------------------------------------------------------------
 * Abort a previous SCSI request
 *---------------------------------------------------------------------*/
int megaraid_abort (Scsi_Cmnd * SCpnt)
{
        mega_host_config *megaCfg;
        int rc;                 /*, idx; */
        mega_scb *pScb;

        rc = SCSI_ABORT_NOT_RUNNING;

        megaCfg = (mega_host_config *) SCpnt->host->hostdata;

        megaCfg->flag |= IN_ABORT;

        for (pScb = megaCfg->qPendingH; pScb; pScb = pScb->next) {
                if (pScb->SCpnt == SCpnt) {
                        /* Found an aborting command */
#if DEBUG
                        showMbox (pScb);
#endif

        /*
         * If the command is queued to be issued to the firmware, abort the scsi cmd,
         * If the command is already aborted in a previous call to the _abort entry
         *  point, return SCSI_ABORT_SNOOZE, suggesting a reset.
         * If the command is issued to the firmware, which might complete after
         *  some time, we will mark the scb as aborted, and return to the mid layer,
         *  that abort could not be done.
         *  In the ISR, when this command actually completes, we will perform a normal
         *  completion.
         *
         * Oct 27, 1999
         */

                        switch (pScb->state) {
                        case SCB_ABORTED:       /* Already aborted */
                                rc = SCSI_ABORT_SNOOZE;
                                break;
                        case SCB_ISSUED:        /* Waiting on ISR result */
                                rc = SCSI_ABORT_NOT_RUNNING;
                                pScb->state = SCB_ABORTED;
                                break;
                        case SCB_ACTIVE:        /* still on the pending queue */
                                mega_freeSCB (megaCfg, pScb);
                                SCpnt->result = (DID_ABORT << 16);
                                if (megaCfg->qCompletedH == NULL) {
                                        megaCfg->qCompletedH =
                                            megaCfg->qCompletedT = SCpnt;
                                } else {
                                        megaCfg->qCompletedT->host_scribble =
                                            (unsigned char *) SCpnt;
                                        megaCfg->qCompletedT = SCpnt;
                                }
                                megaCfg->qCompletedT->host_scribble =
                                    (unsigned char *) NULL;
                                megaCfg->qCcnt++;
                                rc = SCSI_ABORT_SUCCESS;
                                break;
                        default:
                                printk
                                    ("megaraid_abort: unknown command state!!\n");
                                rc = SCSI_ABORT_NOT_RUNNING;
                                break;
                        }
                        break;
                }
        }

        megaCfg->flag &= ~IN_ABORT;

#if DEBUG
        if (megaCfg->flag & IN_QUEUE)
                printk ("ma:flag is in queue\n");
        if (megaCfg->qCompletedH == NULL)
                printk ("ma:qchead == null\n");
#endif

        /*
         * This is required here to complete any completed requests to be communicated
         * over to the mid layer.
         * Calling just mega_rundoneq() did not work.
         */
        if (megaCfg->qCompletedH) {
                SCpnt = megaCfg->qCompletedH;
                megaCfg->qCompletedH = (Scsi_Cmnd *) SCpnt->host_scribble;
                megaCfg->qCcnt--;

                SCpnt->host_scribble = (unsigned char *) NULL;
                /* Callback */
                callDone (SCpnt);
        }
        mega_rundoneq (megaCfg);

        return rc;
}

/*---------------------------------------------------------------------
 * Reset a previous SCSI request
 *---------------------------------------------------------------------*/

int megaraid_reset (Scsi_Cmnd * SCpnt, unsigned int rstflags)
{
        mega_host_config *megaCfg;
        int idx;
        int rc;
        mega_scb *pScb;

        rc = SCSI_RESET_NOT_RUNNING;
        megaCfg = (mega_host_config *) SCpnt->host->hostdata;

        megaCfg->flag |= IN_RESET;

        printk
            ("megaraid_RESET: %.08lx cmd=%.02x <c=%d.t=%d.l=%d>, flag = %x\n",
             SCpnt->serial_number, SCpnt->cmnd[0], SCpnt->channel,
             SCpnt->target, SCpnt->lun, rstflags);

        TRACE (("RESET: %.08lx %.02x <%d.%d.%d>\n",
                SCpnt->serial_number, SCpnt->cmnd[0], SCpnt->channel,
                SCpnt->target, SCpnt->lun));

        /*
         * Walk list of SCBs for any that are still outstanding
         */
        for (idx = 0; idx < megaCfg->max_cmds; idx++) {
                if (megaCfg->scbList[idx].state != SCB_FREE) {
                        SCpnt = megaCfg->scbList[idx].SCpnt;
                        pScb = &megaCfg->scbList[idx];
                        if (SCpnt != NULL) {
                                pScb->state = SCB_RESET;
                                break;
                        }
                }
        }

        megaCfg->flag &= ~IN_RESET;

        mega_rundoneq (megaCfg);
        return rc;
}

#ifdef CONFIG_PROC_FS
/* Following code handles /proc fs  */
static int proc_printf (mega_host_config * megaCfg, const char *fmt, ...)
{
        va_list args;
        int i;

        if (megaCfg->procidx > PROCBUFSIZE)
                return 0;

        va_start (args, fmt);
        i = vsprintf ((megaCfg->procbuf + megaCfg->procidx), fmt, args);
        va_end (args);

        megaCfg->procidx += i;
        return i;
}

static int proc_read_config (char *page, char **start, off_t offset,
                  int count, int *eof, void *data)
{

        mega_host_config *megaCfg = (mega_host_config *) data;

        *start = page;

        if (megaCfg->productInfo.ProductName[0] != 0)
                proc_printf (megaCfg, "%s\n", megaCfg->productInfo.ProductName);

        proc_printf (megaCfg, "Controller Type: ");

        if (megaCfg->flag & BOARD_QUARTZ)
                proc_printf (megaCfg, "438/466/467/471/493\n");
        else
                proc_printf (megaCfg, "418/428/434\n");

        if (megaCfg->flag & BOARD_40LD)
                proc_printf (megaCfg,
                             "Controller Supports 40 Logical Drives\n");

        if (megaCfg->flag & BOARD_64BIT)
                proc_printf (megaCfg,
                             "Controller / Driver uses 64 bit memory addressing\n");

        proc_printf (megaCfg, "Base = %08x, Irq = %d, ", megaCfg->base,
                     megaCfg->host->irq);

        proc_printf (megaCfg, "Logical Drives = %d, Channels = %d\n",
                     megaCfg->numldrv, megaCfg->productInfo.SCSIChanPresent);

        proc_printf (megaCfg, "Version =%s:%s, DRAM = %dMb\n",
                     megaCfg->fwVer, megaCfg->biosVer,
                     megaCfg->productInfo.DramSize);

        proc_printf (megaCfg,
                     "Controller Queue Depth = %d, Driver Queue Depth = %d\n",
                     megaCfg->productInfo.MaxConcCmds, megaCfg->max_cmds);
        COPY_BACK;
        return count;
}

static int proc_read_stat (char *page, char **start, off_t offset,
                int count, int *eof, void *data)
{
        int i;
        mega_host_config *megaCfg = (mega_host_config *) data;

        *start = page;

        proc_printf (megaCfg, "Statistical Information for this controller\n");
        proc_printf (megaCfg, "Interrupts Collected = %lu\n",
                     megaCfg->nInterrupts);

        for (i = 0; i < megaCfg->numldrv; i++) {
                proc_printf (megaCfg, "Logical Drive %d:\n", i);

                proc_printf (megaCfg,
                             "\tReads Issued = %lu, Writes Issued = %lu\n",
                             megaCfg->nReads[i], megaCfg->nWrites[i]);

                proc_printf (megaCfg,
                             "\tSectors Read = %lu, Sectors Written = %lu\n\n",
                             megaCfg->nReadBlocks[i], megaCfg->nWriteBlocks[i]);

        }

        COPY_BACK;
        return count;
}

static int proc_read_status (char *page, char **start, off_t offset,
                  int count, int *eof, void *data)
{
        mega_host_config *megaCfg = (mega_host_config *) data;
        *start = page;

        proc_printf (megaCfg, "TBD\n");
        COPY_BACK;
        return count;
}

static int proc_read_mbox (char *page, char **start, off_t offset,
                int count, int *eof, void *data)
{

        mega_host_config *megaCfg = (mega_host_config *) data;
        volatile mega_mailbox *mbox = megaCfg->mbox;

        *start = page;

        proc_printf (megaCfg, "Contents of Mail Box Structure\n");
        proc_printf (megaCfg, "  Fw Command   = 0x%02x\n", mbox->cmd);
        proc_printf (megaCfg, "  Cmd Sequence = 0x%02x\n", mbox->cmdid);
        proc_printf (megaCfg, "  No of Sectors= %04d\n", mbox->numsectors);
        proc_printf (megaCfg, "  LBA          = 0x%02x\n", mbox->lba);
        proc_printf (megaCfg, "  DTA          = 0x%08x\n", mbox->xferaddr);
        proc_printf (megaCfg, "  Logical Drive= 0x%02x\n", mbox->logdrv);
        proc_printf (megaCfg, "  No of SG Elmt= 0x%02x\n", mbox->numsgelements);
        proc_printf (megaCfg, "  Busy         = %01x\n", mbox->busy);
        proc_printf (megaCfg, "  Status       = 0x%02x\n", mbox->status);

        /* proc_printf(megaCfg, "Dump of MailBox\n");
        for (i = 0; i < 16; i++)
                proc_printf(megaCfg, "%02x ",*(mbox + i));

        proc_printf(megaCfg, "\n\nNumber of Status = %02d\n",mbox->numstatus);

        for (i = 0; i < 46; i++) {
                proc_printf(megaCfg,"%02d ",*(mbox + 16 + i));
        if (i%16)
                proc_printf(megaCfg,"\n");
        }

        if (!mbox->numsgelements) {
                dta = phys_to_virt(mbox->xferaddr);
                for (i = 0; i < mbox->numsgelements; i++)
                        if (dta) {
                                proc_printf(megaCfg,"Addr = %08x\n", (ulong)*(dta + i));                        proc_printf(megaCfg,"Length = %08x\n",
                                        (ulong)*(dta + i + 4));
                        }
        }*/
        COPY_BACK;
        return count;
}

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0)  /*0x20300 */
#define CREATE_READ_PROC(string, fxn) create_proc_read_entry(string, \
                                         S_IRUSR | S_IFREG,\
                                         controller_proc_dir_entry,\
                                         fxn, megaCfg)
#else
#define CREATE_READ_PROC(string, fxn) create_proc_read_entry(string,S_IRUSR | S_IFREG, controller_proc_dir_entry, fxn, megaCfg)

static struct proc_dir_entry *
create_proc_read_entry (const char *string,
                        int mode,
                        struct proc_dir_entry *parent,
                        read_proc_t * fxn, mega_host_config * megaCfg)
{
        struct proc_dir_entry *temp = NULL;

        temp = kmalloc (sizeof (struct proc_dir_entry), GFP_KERNEL);
        if (!temp)
                return NULL;
        memset (temp, 0, sizeof (struct proc_dir_entry));

        if ((temp->name = kmalloc (strlen (string) + 1, GFP_KERNEL)) == NULL) {
                kfree (temp);
                return NULL;