[PATCH] CONFIG_PM=n slim: drivers/parport/parport_serial.c

[linux-2.6] / drivers / scsi / qla1280.c

/******************************************************************************
*                  QLOGIC LINUX SOFTWARE
*
* QLogic  QLA1280 (Ultra2)  and  QLA12160 (Ultra3) SCSI driver
* Copyright (C) 2000 Qlogic Corporation (www.qlogic.com)
* Copyright (C) 2001-2004 Jes Sorensen, Wild Open Source Inc.
* Copyright (C) 2003-2004 Christoph Hellwig
*
* 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, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* General Public License for more details.
*
******************************************************************************/
#define QLA1280_VERSION      "3.26"
/*****************************************************************************
    Revision History:
    Rev  3.26, January 16, 2006 Jes Sorensen
        - Ditch all < 2.6 support
    Rev  3.25.1, February 10, 2005 Christoph Hellwig
        - use pci_map_single to map non-S/G requests
        - remove qla1280_proc_info
    Rev  3.25, September 28, 2004, Christoph Hellwig
        - add support for ISP1020/1040
        - don't include "scsi.h" anymore for 2.6.x
    Rev  3.24.4 June 7, 2004 Christoph Hellwig
        - restructure firmware loading, cleanup initialization code
        - prepare support for ISP1020/1040 chips
    Rev  3.24.3 January 19, 2004, Jes Sorensen
        - Handle PCI DMA mask settings correctly
        - Correct order of error handling in probe_one, free_irq should not
          be called if request_irq failed
    Rev  3.24.2 January 19, 2004, James Bottomley & Andrew Vasquez
        - Big endian fixes (James)
        - Remove bogus IOCB content on zero data transfer commands (Andrew)
    Rev  3.24.1 January 5, 2004, Jes Sorensen
        - Initialize completion queue to avoid OOPS on probe
        - Handle interrupts during mailbox testing
    Rev  3.24 November 17, 2003, Christoph Hellwig
        - use struct list_head for completion queue
        - avoid old Scsi_FOO typedefs
        - cleanup 2.4 compat glue a bit
        - use <scsi/scsi_*.h> headers on 2.6 instead of "scsi.h"
        - make initialization for memory mapped vs port I/O more similar
        - remove broken pci config space manipulation
        - kill more cruft
        - this is an almost perfect 2.6 scsi driver now! ;)
    Rev  3.23.39 December 17, 2003, Jes Sorensen
        - Delete completion queue from srb if mailbox command failed to
          to avoid qla1280_done completeting qla1280_error_action's
          obsolete context
        - Reduce arguments for qla1280_done
    Rev  3.23.38 October 18, 2003, Christoph Hellwig
        - Convert to new-style hotplugable driver for 2.6
        - Fix missing scsi_unregister/scsi_host_put on HBA removal
        - Kill some more cruft
    Rev  3.23.37 October 1, 2003, Jes Sorensen
        - Make MMIO depend on CONFIG_X86_VISWS instead of yet another
          random CONFIG option
        - Clean up locking in probe path
    Rev  3.23.36 October 1, 2003, Christoph Hellwig
        - queuecommand only ever receives new commands - clear flags
        - Reintegrate lost fixes from Linux 2.5
    Rev  3.23.35 August 14, 2003, Jes Sorensen
        - Build against 2.6
    Rev  3.23.34 July 23, 2003, Jes Sorensen
        - Remove pointless TRUE/FALSE macros
        - Clean up vchan handling
    Rev  3.23.33 July 3, 2003, Jes Sorensen
        - Don't define register access macros before define determining MMIO.
          This just happend to work out on ia64 but not elsewhere.
        - Don't try and read from the card while it is in reset as
          it won't respond and causes an MCA
    Rev  3.23.32 June 23, 2003, Jes Sorensen
        - Basic support for boot time arguments
    Rev  3.23.31 June 8, 2003, Jes Sorensen
        - Reduce boot time messages
    Rev  3.23.30 June 6, 2003, Jes Sorensen
        - Do not enable sync/wide/ppr before it has been determined
          that the target device actually supports it
        - Enable DMA arbitration for multi channel controllers
    Rev  3.23.29 June 3, 2003, Jes Sorensen
        - Port to 2.5.69
    Rev  3.23.28 June 3, 2003, Jes Sorensen
        - Eliminate duplicate marker commands on bus resets
        - Handle outstanding commands appropriately on bus/device resets
    Rev  3.23.27 May 28, 2003, Jes Sorensen
        - Remove bogus input queue code, let the Linux SCSI layer do the work
        - Clean up NVRAM handling, only read it once from the card
        - Add a number of missing default nvram parameters
    Rev  3.23.26 Beta May 28, 2003, Jes Sorensen
        - Use completion queue for mailbox commands instead of busy wait
    Rev  3.23.25 Beta May 27, 2003, James Bottomley
        - Migrate to use new error handling code
    Rev  3.23.24 Beta May 21, 2003, James Bottomley
        - Big endian support
        - Cleanup data direction code
    Rev  3.23.23 Beta May 12, 2003, Jes Sorensen
        - Switch to using MMIO instead of PIO
    Rev  3.23.22 Beta April 15, 2003, Jes Sorensen
        - Fix PCI parity problem with 12160 during reset.
    Rev  3.23.21 Beta April 14, 2003, Jes Sorensen
        - Use pci_map_page()/pci_unmap_page() instead of map_single version.
    Rev  3.23.20 Beta April 9, 2003, Jes Sorensen
        - Remove < 2.4.x support
        - Introduce HOST_LOCK to make the spin lock changes portable.
        - Remove a bunch of idiotic and unnecessary typedef's
        - Kill all leftovers of target-mode support which never worked anyway
    Rev  3.23.19 Beta April 11, 2002, Linus Torvalds
        - Do qla1280_pci_config() before calling request_irq() and
          request_region()
        - Use pci_dma_hi32() to handle upper word of DMA addresses instead
          of large shifts
        - Hand correct arguments to free_irq() in case of failure
    Rev  3.23.18 Beta April 11, 2002, Jes Sorensen
        - Run source through Lindent and clean up the output
    Rev  3.23.17 Beta April 11, 2002, Jes Sorensen
        - Update SCSI firmware to qla1280 v8.15.00 and qla12160 v10.04.32
    Rev  3.23.16 Beta March 19, 2002, Jes Sorensen
        - Rely on mailbox commands generating interrupts - do not
          run qla1280_isr() from ql1280_mailbox_command()
        - Remove device_reg_t
        - Integrate ql12160_set_target_parameters() with 1280 version
        - Make qla1280_setup() non static
        - Do not call qla1280_check_for_dead_scsi_bus() on every I/O request
          sent to the card - this command pauses the firmare!!!
    Rev  3.23.15 Beta March 19, 2002, Jes Sorensen
        - Clean up qla1280.h - remove obsolete QL_DEBUG_LEVEL_x definitions
        - Remove a pile of pointless and confusing (srb_t **) and
          (scsi_lu_t *) typecasts
        - Explicit mark that we do not use the new error handling (for now)
        - Remove scsi_qla_host_t and use 'struct' instead
        - Remove in_abort, watchdog_enabled, dpc, dpc_sched, bios_enabled,
          pci_64bit_slot flags which weren't used for anything anyway
        - Grab host->host_lock while calling qla1280_isr() from abort()
        - Use spin_lock()/spin_unlock() in qla1280_intr_handler() - we
          do not need to save/restore flags in the interrupt handler
        - Enable interrupts early (before any mailbox access) in preparation
          for cleaning up the mailbox handling
    Rev  3.23.14 Beta March 14, 2002, Jes Sorensen
        - Further cleanups. Remove all trace of QL_DEBUG_LEVEL_x and replace
          it with proper use of dprintk().
        - Make qla1280_print_scsi_cmd() and qla1280_dump_buffer() both take
          a debug level argument to determine if data is to be printed
        - Add KERN_* info to printk()
    Rev  3.23.13 Beta March 14, 2002, Jes Sorensen
        - Significant cosmetic cleanups
        - Change debug code to use dprintk() and remove #if mess
    Rev  3.23.12 Beta March 13, 2002, Jes Sorensen
        - More cosmetic cleanups, fix places treating return as function
        - use cpu_relax() in qla1280_debounce_register()
    Rev  3.23.11 Beta March 13, 2002, Jes Sorensen
        - Make it compile under 2.5.5
    Rev  3.23.10 Beta October 1, 2001, Jes Sorensen
        - Do no typecast short * to long * in QL1280BoardTbl, this
          broke miserably on big endian boxes
    Rev  3.23.9 Beta September 30, 2001, Jes Sorensen
        - Remove pre 2.2 hack for checking for reentrance in interrupt handler
        - Make data types used to receive from SCSI_{BUS,TCN,LUN}_32
          unsigned int to match the types from struct scsi_cmnd
    Rev  3.23.8 Beta September 29, 2001, Jes Sorensen
        - Remove bogus timer_t typedef from qla1280.h
        - Remove obsolete pre 2.2 PCI setup code, use proper #define's
          for PCI_ values, call pci_set_master()
        - Fix memleak of qla1280_buffer on module unload
        - Only compile module parsing code #ifdef MODULE - should be
          changed to use individual MODULE_PARM's later
        - Remove dummy_buffer that was never modified nor printed
        - ENTER()/LEAVE() are noops unless QL_DEBUG_LEVEL_3, hence remove
          #ifdef QL_DEBUG_LEVEL_3/#endif around ENTER()/LEAVE() calls
        - Remove \r from print statements, this is Linux, not DOS
        - Remove obsolete QLA1280_{SCSILU,INTR,RING}_{LOCK,UNLOCK}
          dummy macros
        - Remove C++ compile hack in header file as Linux driver are not
          supposed to be compiled as C++
        - Kill MS_64BITS macro as it makes the code more readable
        - Remove unnecessary flags.in_interrupts bit
    Rev  3.23.7 Beta August 20, 2001, Jes Sorensen
        - Dont' check for set flags on q->q_flag one by one in qla1280_next()
        - Check whether the interrupt was generated by the QLA1280 before
          doing any processing
        - qla1280_status_entry(): Only zero out part of sense_buffer that
          is not being copied into
        - Remove more superflouous typecasts
        - qla1280_32bit_start_scsi() replace home-brew memcpy() with memcpy()
    Rev  3.23.6 Beta August 20, 2001, Tony Luck, Intel
        - Don't walk the entire list in qla1280_putq_t() just to directly
          grab the pointer to the last element afterwards
    Rev  3.23.5 Beta August 9, 2001, Jes Sorensen
        - Don't use IRQF_DISABLED, it's use is deprecated for this kinda driver
    Rev  3.23.4 Beta August 8, 2001, Jes Sorensen
        - Set dev->max_sectors to 1024
    Rev  3.23.3 Beta August 6, 2001, Jes Sorensen
        - Provide compat macros for pci_enable_device(), pci_find_subsys()
          and scsi_set_pci_device()
        - Call scsi_set_pci_device() for all devices
        - Reduce size of kernel version dependent device probe code
        - Move duplicate probe/init code to separate function
        - Handle error if qla1280_mem_alloc() fails
        - Kill OFFSET() macro and use Linux's PCI definitions instead
        - Kill private structure defining PCI config space (struct config_reg)
        - Only allocate I/O port region if not in MMIO mode
        - Remove duplicate (unused) sanity check of sife of srb_t
    Rev  3.23.2 Beta August 6, 2001, Jes Sorensen
        - Change home-brew memset() implementations to use memset()
        - Remove all references to COMTRACE() - accessing a PC's COM2 serial
          port directly is not legal under Linux.
    Rev  3.23.1 Beta April 24, 2001, Jes Sorensen
        - Remove pre 2.2 kernel support
        - clean up 64 bit DMA setting to use 2.4 API (provide backwards compat)
        - Fix MMIO access to use readl/writel instead of directly
          dereferencing pointers
        - Nuke MSDOS debugging code
        - Change true/false data types to int from uint8_t
        - Use int for counters instead of uint8_t etc.
        - Clean up size & byte order conversion macro usage
    Rev  3.23 Beta January 11, 2001 BN Qlogic
        - Added check of device_id when handling non
          QLA12160s during detect().
    Rev  3.22 Beta January 5, 2001 BN Qlogic
        - Changed queue_task() to schedule_task()
          for kernels 2.4.0 and higher.
          Note: 2.4.0-testxx kernels released prior to
                the actual 2.4.0 kernel release on January 2001
                will get compile/link errors with schedule_task().
                Please update your kernel to released 2.4.0 level,
                or comment lines in this file flagged with  3.22
                to resolve compile/link error of schedule_task().
        - Added -DCONFIG_SMP in addition to -D__SMP__
          in Makefile for 2.4.0 builds of driver as module.
    Rev  3.21 Beta January 4, 2001 BN Qlogic
        - Changed criteria of 64/32 Bit mode of HBA
          operation according to BITS_PER_LONG rather
          than HBA's NVRAM setting of >4Gig memory bit;
          so that the HBA auto-configures without the need
          to setup each system individually.
    Rev  3.20 Beta December 5, 2000 BN Qlogic
        - Added priority handling to IA-64  onboard SCSI
          ISP12160 chip for kernels greater than 2.3.18.
        - Added irqrestore for qla1280_intr_handler.
        - Enabled /proc/scsi/qla1280 interface.
        - Clear /proc/scsi/qla1280 counters in detect().
    Rev  3.19 Beta October 13, 2000 BN Qlogic
        - Declare driver_template for new kernel
          (2.4.0 and greater) scsi initialization scheme.
        - Update /proc/scsi entry for 2.3.18 kernels and
          above as qla1280
    Rev  3.18 Beta October 10, 2000 BN Qlogic
        - Changed scan order of adapters to map
          the QLA12160 followed by the QLA1280.
    Rev  3.17 Beta September 18, 2000 BN Qlogic
        - Removed warnings for 32 bit 2.4.x compiles
        - Corrected declared size for request and response
          DMA addresses that are kept in each ha
    Rev. 3.16 Beta  August 25, 2000   BN  Qlogic
        - Corrected 64 bit addressing issue on IA-64
          where the upper 32 bits were not properly
          passed to the RISC engine.
    Rev. 3.15 Beta  August 22, 2000   BN  Qlogic
        - Modified qla1280_setup_chip to properly load
          ISP firmware for greater that 4 Gig memory on IA-64
    Rev. 3.14 Beta  August 16, 2000   BN  Qlogic
        - Added setting of dma_mask to full 64 bit
          if flags.enable_64bit_addressing is set in NVRAM
    Rev. 3.13 Beta  August 16, 2000   BN  Qlogic
        - Use new PCI DMA mapping APIs for 2.4.x kernel
    Rev. 3.12       July 18, 2000    Redhat & BN Qlogic
        - Added check of pci_enable_device to detect() for 2.3.x
        - Use pci_resource_start() instead of
          pdev->resource[0].start in detect() for 2.3.x
        - Updated driver version
    Rev. 3.11       July 14, 2000    BN  Qlogic
        - Updated SCSI Firmware to following versions:
          qla1x80:   8.13.08
          qla1x160:  10.04.08
        - Updated driver version to 3.11
    Rev. 3.10    June 23, 2000   BN Qlogic
        - Added filtering of AMI SubSys Vendor ID devices
    Rev. 3.9
        - DEBUG_QLA1280 undefined and  new version  BN Qlogic
    Rev. 3.08b      May 9, 2000    MD Dell
        - Added logic to check against AMI subsystem vendor ID
        Rev. 3.08       May 4, 2000    DG  Qlogic
        - Added logic to check for PCI subsystem ID.
        Rev. 3.07       Apr 24, 2000    DG & BN  Qlogic
           - Updated SCSI Firmware to following versions:
             qla12160:   10.01.19
                 qla1280:     8.09.00
        Rev. 3.06       Apr 12, 2000    DG & BN  Qlogic
           - Internal revision; not released
    Rev. 3.05       Mar 28, 2000    DG & BN  Qlogic
       - Edit correction for virt_to_bus and PROC.
    Rev. 3.04       Mar 28, 2000    DG & BN  Qlogic
       - Merge changes from ia64 port.
    Rev. 3.03       Mar 28, 2000    BN  Qlogic
       - Increase version to reflect new code drop with compile fix
         of issue with inclusion of linux/spinlock for 2.3 kernels
    Rev. 3.02       Mar 15, 2000    BN  Qlogic
       - Merge qla1280_proc_info from 2.10 code base
    Rev. 3.01       Feb 10, 2000    BN  Qlogic
       - Corrected code to compile on a 2.2.x kernel.
    Rev. 3.00       Jan 17, 2000    DG  Qlogic
           - Added 64-bit support.
    Rev. 2.07       Nov 9, 1999     DG  Qlogic
           - Added new routine to set target parameters for ISP12160.
    Rev. 2.06       Sept 10, 1999     DG  Qlogic
       - Added support for ISP12160 Ultra 3 chip.
    Rev. 2.03       August 3, 1999    Fred Lewis, Intel DuPont
        - Modified code to remove errors generated when compiling with
          Cygnus IA64 Compiler.
        - Changed conversion of pointers to unsigned longs instead of integers.
        - Changed type of I/O port variables from uint32_t to unsigned long.
        - Modified OFFSET macro to work with 64-bit as well as 32-bit.
        - Changed sprintf and printk format specifiers for pointers to %p.
        - Changed some int to long type casts where needed in sprintf & printk.
        - Added l modifiers to sprintf and printk format specifiers for longs.
        - Removed unused local variables.
    Rev. 1.20       June 8, 1999      DG,  Qlogic
         Changes to support RedHat release 6.0 (kernel 2.2.5).
       - Added SCSI exclusive access lock (io_request_lock) when accessing
         the adapter.
       - Added changes for the new LINUX interface template. Some new error
         handling routines have been added to the template, but for now we
         will use the old ones.
    -   Initial Beta Release.
*****************************************************************************/


#include <linux/module.h>

#include <linux/version.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pci_ids.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/byteorder.h>
#include <asm/processor.h>
#include <asm/types.h>
#include <asm/system.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>

#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
#include <asm/sn/io.h>
#endif

#if LINUX_VERSION_CODE < 0x020600
#error "Kernels older than 2.6.0 are no longer supported"
#endif


/*
 * Compile time Options:
 *            0 - Disable and 1 - Enable
 */
#define  DEBUG_QLA1280_INTR     0
#define  DEBUG_PRINT_NVRAM      0
#define  DEBUG_QLA1280          0

/*
 * The SGI VISWS is broken and doesn't support MMIO ;-(
 */
#ifdef CONFIG_X86_VISWS
#define MEMORY_MAPPED_IO        0
#else
#define MEMORY_MAPPED_IO        1
#endif

#define UNIQUE_FW_NAME
#include "qla1280.h"
#include "ql12160_fw.h"         /* ISP RISC codes */
#include "ql1280_fw.h"
#include "ql1040_fw.h"

#ifndef BITS_PER_LONG
#error "BITS_PER_LONG not defined!"
#endif
#if (BITS_PER_LONG == 64) || defined CONFIG_HIGHMEM
#define QLA_64BIT_PTR   1
#endif

#ifdef QLA_64BIT_PTR
#define pci_dma_hi32(a)                 ((a >> 16) >> 16)
#else
#define pci_dma_hi32(a)                 0
#endif
#define pci_dma_lo32(a)                 (a & 0xffffffff)

#define NVRAM_DELAY()                   udelay(500)     /* 2 microseconds */

#if defined(__ia64__) && !defined(ia64_platform_is)
#define ia64_platform_is(foo)           (!strcmp(x, platform_name))
#endif


#define IS_ISP1040(ha) (ha->pdev->device == PCI_DEVICE_ID_QLOGIC_ISP1020)
#define IS_ISP1x40(ha) (ha->pdev->device == PCI_DEVICE_ID_QLOGIC_ISP1020 || \
                        ha->pdev->device == PCI_DEVICE_ID_QLOGIC_ISP1240)
#define IS_ISP1x160(ha)        (ha->pdev->device == PCI_DEVICE_ID_QLOGIC_ISP10160 || \
                                ha->pdev->device == PCI_DEVICE_ID_QLOGIC_ISP12160)


static int qla1280_probe_one(struct pci_dev *, const struct pci_device_id *);
static void qla1280_remove_one(struct pci_dev *);

/*
 *  QLogic Driver Support Function Prototypes.
 */
static void qla1280_done(struct scsi_qla_host *);
static int qla1280_get_token(char *);
static int qla1280_setup(char *s) __init;

/*
 *  QLogic ISP1280 Hardware Support Function Prototypes.
 */
static int qla1280_load_firmware(struct scsi_qla_host *);
static int qla1280_init_rings(struct scsi_qla_host *);
static int qla1280_nvram_config(struct scsi_qla_host *);
static int qla1280_mailbox_command(struct scsi_qla_host *,
                                   uint8_t, uint16_t *);
static int qla1280_bus_reset(struct scsi_qla_host *, int);
static int qla1280_device_reset(struct scsi_qla_host *, int, int);
static int qla1280_abort_device(struct scsi_qla_host *, int, int, int);
static int qla1280_abort_command(struct scsi_qla_host *, struct srb *, int);
static int qla1280_abort_isp(struct scsi_qla_host *);
#ifdef QLA_64BIT_PTR
static int qla1280_64bit_start_scsi(struct scsi_qla_host *, struct srb *);
#else
static int qla1280_32bit_start_scsi(struct scsi_qla_host *, struct srb *);
#endif
static void qla1280_nv_write(struct scsi_qla_host *, uint16_t);
static void qla1280_poll(struct scsi_qla_host *);
static void qla1280_reset_adapter(struct scsi_qla_host *);
static void qla1280_marker(struct scsi_qla_host *, int, int, int, u8);
static void qla1280_isp_cmd(struct scsi_qla_host *);
static void qla1280_isr(struct scsi_qla_host *, struct list_head *);
static void qla1280_rst_aen(struct scsi_qla_host *);
static void qla1280_status_entry(struct scsi_qla_host *, struct response *,
                                 struct list_head *);
static void qla1280_error_entry(struct scsi_qla_host *, struct response *,
                                struct list_head *);
static uint16_t qla1280_get_nvram_word(struct scsi_qla_host *, uint32_t);
static uint16_t qla1280_nvram_request(struct scsi_qla_host *, uint32_t);
static uint16_t qla1280_debounce_register(volatile uint16_t __iomem *);
static request_t *qla1280_req_pkt(struct scsi_qla_host *);
static int qla1280_check_for_dead_scsi_bus(struct scsi_qla_host *,
                                           unsigned int);
static void qla1280_get_target_parameters(struct scsi_qla_host *,
                                           struct scsi_device *);
static int qla1280_set_target_parameters(struct scsi_qla_host *, int, int);


static struct qla_driver_setup driver_setup;

/*
 * convert scsi data direction to request_t control flags
 */
static inline uint16_t
qla1280_data_direction(struct scsi_cmnd *cmnd)
{
        switch(cmnd->sc_data_direction) {
        case DMA_FROM_DEVICE:
                return BIT_5;
        case DMA_TO_DEVICE:
                return BIT_6;
        case DMA_BIDIRECTIONAL:
                return BIT_5 | BIT_6;
        /*
         * We could BUG() on default here if one of the four cases aren't
         * met, but then again if we receive something like that from the
         * SCSI layer we have more serious problems. This shuts up GCC.
         */
        case DMA_NONE:
        default:
                return 0;
        }
}
                
#if DEBUG_QLA1280
static void __qla1280_print_scsi_cmd(struct scsi_cmnd * cmd);
static void __qla1280_dump_buffer(char *, int);
#endif


/*
 * insmod needs to find the variable and make it point to something
 */
#ifdef MODULE
static char *qla1280;

/* insmod qla1280 options=verbose" */
module_param(qla1280, charp, 0);
#else
__setup("qla1280=", qla1280_setup);
#endif


/*
 * We use the scsi_pointer structure that's included with each scsi_command
 * to overlay our struct srb over it. qla1280_init() checks that a srb is not
 * bigger than a scsi_pointer.
 */

#define CMD_SP(Cmnd)            &Cmnd->SCp
#define CMD_CDBLEN(Cmnd)        Cmnd->cmd_len
#define CMD_CDBP(Cmnd)          Cmnd->cmnd
#define CMD_SNSP(Cmnd)          Cmnd->sense_buffer
#define CMD_SNSLEN(Cmnd)        sizeof(Cmnd->sense_buffer)
#define CMD_RESULT(Cmnd)        Cmnd->result
#define CMD_HANDLE(Cmnd)        Cmnd->host_scribble
#define CMD_REQUEST(Cmnd)       Cmnd->request->cmd

#define CMD_HOST(Cmnd)          Cmnd->device->host
#define SCSI_BUS_32(Cmnd)       Cmnd->device->channel
#define SCSI_TCN_32(Cmnd)       Cmnd->device->id
#define SCSI_LUN_32(Cmnd)       Cmnd->device->lun


/*****************************************/
/*   ISP Boards supported by this driver */
/*****************************************/

struct qla_boards {
        unsigned char name[9];  /* Board ID String */
        int numPorts;           /* Number of SCSI ports */
        unsigned short *fwcode; /* pointer to FW array         */
        unsigned short *fwlen;  /* number of words in array    */
        unsigned short *fwstart;        /* start address for F/W       */
        unsigned char *fwver;   /* Ptr to F/W version array    */
};

/* NOTE: the last argument in each entry is used to index ql1280_board_tbl */
static struct pci_device_id qla1280_pci_tbl[] = {
        {PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_ISP12160,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_ISP1020,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
        {PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_ISP1080,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 2},
        {PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_ISP1240,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 3},
        {PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_ISP1280,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4},
        {PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_ISP10160,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 5},
        {0,}
};
MODULE_DEVICE_TABLE(pci, qla1280_pci_tbl);

static struct qla_boards ql1280_board_tbl[] = {
        /* Name ,  Number of ports, FW details */
        {"QLA12160", 2, &fw12160i_code01[0], &fw12160i_length01,
         &fw12160i_addr01, &fw12160i_version_str[0]},
        {"QLA1040", 1, &risc_code01[0], &risc_code_length01,
         &risc_code_addr01, &firmware_version[0]},
        {"QLA1080", 1, &fw1280ei_code01[0], &fw1280ei_length01,
         &fw1280ei_addr01, &fw1280ei_version_str[0]},
        {"QLA1240", 2, &fw1280ei_code01[0], &fw1280ei_length01,
         &fw1280ei_addr01, &fw1280ei_version_str[0]},
        {"QLA1280", 2, &fw1280ei_code01[0], &fw1280ei_length01,
         &fw1280ei_addr01, &fw1280ei_version_str[0]},
        {"QLA10160", 1, &fw12160i_code01[0], &fw12160i_length01,
         &fw12160i_addr01, &fw12160i_version_str[0]},
        {"        ", 0}
};

static int qla1280_verbose = 1;

#if DEBUG_QLA1280
static int ql_debug_level = 1;
#define dprintk(level, format, a...)    \
        do { if (ql_debug_level >= level) printk(KERN_ERR format, ##a); } while(0)
#define qla1280_dump_buffer(level, buf, size)   \
        if (ql_debug_level >= level) __qla1280_dump_buffer(buf, size)
#define qla1280_print_scsi_cmd(level, cmd)      \
        if (ql_debug_level >= level) __qla1280_print_scsi_cmd(cmd)
#else
#define ql_debug_level                  0
#define dprintk(level, format, a...)    do{}while(0)
#define qla1280_dump_buffer(a, b, c)    do{}while(0)
#define qla1280_print_scsi_cmd(a, b)    do{}while(0)
#endif

#define ENTER(x)                dprintk(3, "qla1280 : Entering %s()\n", x);
#define LEAVE(x)                dprintk(3, "qla1280 : Leaving %s()\n", x);
#define ENTER_INTR(x)           dprintk(4, "qla1280 : Entering %s()\n", x);
#define LEAVE_INTR(x)           dprintk(4, "qla1280 : Leaving %s()\n", x);


static int qla1280_read_nvram(struct scsi_qla_host *ha)
{
        uint16_t *wptr;
        uint8_t chksum;
        int cnt, i;
        struct nvram *nv;

        ENTER("qla1280_read_nvram");

        if (driver_setup.no_nvram)
                return 1;

        printk(KERN_INFO "scsi(%ld): Reading NVRAM\n", ha->host_no);

        wptr = (uint16_t *)&ha->nvram;
        nv = &ha->nvram;
        chksum = 0;
        for (cnt = 0; cnt < 3; cnt++) {
                *wptr = qla1280_get_nvram_word(ha, cnt);
                chksum += *wptr & 0xff;
                chksum += (*wptr >> 8) & 0xff;
                wptr++;
        }

        if (nv->id0 != 'I' || nv->id1 != 'S' ||
            nv->id2 != 'P' || nv->id3 != ' ' || nv->version < 1) {
                dprintk(2, "Invalid nvram ID or version!\n");
                chksum = 1;
        } else {
                for (; cnt < sizeof(struct nvram); cnt++) {
                        *wptr = qla1280_get_nvram_word(ha, cnt);
                        chksum += *wptr & 0xff;
                        chksum += (*wptr >> 8) & 0xff;
                        wptr++;
                }
        }

        dprintk(3, "qla1280_read_nvram: NVRAM Magic ID= %c %c %c %02x"
               " version %i\n", nv->id0, nv->id1, nv->id2, nv->id3,
               nv->version);


        if (chksum) {
                if (!driver_setup.no_nvram)
                        printk(KERN_WARNING "scsi(%ld): Unable to identify or "
                               "validate NVRAM checksum, using default "
                               "settings\n", ha->host_no);
                ha->nvram_valid = 0;
        } else
                ha->nvram_valid = 1;

        /* The firmware interface is, um, interesting, in that the
         * actual firmware image on the chip is little endian, thus,
         * the process of taking that image to the CPU would end up
         * little endian.  However, the firmare interface requires it
         * to be read a word (two bytes) at a time.
         *
         * The net result of this would be that the word (and
         * doubleword) quantites in the firmware would be correct, but
         * the bytes would be pairwise reversed.  Since most of the
         * firmware quantites are, in fact, bytes, we do an extra
         * le16_to_cpu() in the firmware read routine.
         *
         * The upshot of all this is that the bytes in the firmware
         * are in the correct places, but the 16 and 32 bit quantites
         * are still in little endian format.  We fix that up below by
         * doing extra reverses on them */
        nv->isp_parameter = cpu_to_le16(nv->isp_parameter);
        nv->firmware_feature.w = cpu_to_le16(nv->firmware_feature.w);
        for(i = 0; i < MAX_BUSES; i++) {
                nv->bus[i].selection_timeout = cpu_to_le16(nv->bus[i].selection_timeout);
                nv->bus[i].max_queue_depth = cpu_to_le16(nv->bus[i].max_queue_depth);
        }
        dprintk(1, "qla1280_read_nvram: Completed Reading NVRAM\n");
        LEAVE("qla1280_read_nvram");

        return chksum;
}

/**************************************************************************
 *   qla1280_info
 *     Return a string describing the driver.
 **************************************************************************/
static const char *
qla1280_info(struct Scsi_Host *host)
{
        static char qla1280_scsi_name_buffer[125];
        char *bp;
        struct scsi_qla_host *ha;
        struct qla_boards *bdp;

        bp = &qla1280_scsi_name_buffer[0];
        ha = (struct scsi_qla_host *)host->hostdata;
        bdp = &ql1280_board_tbl[ha->devnum];
        memset(bp, 0, sizeof(qla1280_scsi_name_buffer));

        sprintf (bp,
                 "QLogic %s PCI to SCSI Host Adapter\n"
                 "       Firmware version: %2d.%02d.%02d, Driver version %s",
                 &bdp->name[0], bdp->fwver[0], bdp->fwver[1], bdp->fwver[2],
                 QLA1280_VERSION);
        return bp;
}

/**************************************************************************
 *   qla1200_queuecommand
 *     Queue a command to the controller.
 *
 * Note:
 * The mid-level driver tries to ensures that queuecommand never gets invoked
 * concurrently with itself or the interrupt handler (although the
 * interrupt handler may call this routine as part of request-completion
 * handling).   Unfortunely, it sometimes calls the scheduler in interrupt
 * context which is a big NO! NO!.
 **************************************************************************/
static int
qla1280_queuecommand(struct scsi_cmnd *cmd, void (*fn)(struct scsi_cmnd *))
{
        struct Scsi_Host *host = cmd->device->host;
        struct scsi_qla_host *ha = (struct scsi_qla_host *)host->hostdata;
        struct srb *sp = (struct srb *)&cmd->SCp;
        int status;

        cmd->scsi_done = fn;
        sp->cmd = cmd;
        sp->flags = 0;

        qla1280_print_scsi_cmd(5, cmd);

#ifdef QLA_64BIT_PTR
        /*
         * Using 64 bit commands if the PCI bridge doesn't support it is a
         * bit wasteful, however this should really only happen if one's
         * PCI controller is completely broken, like the BCM1250. For
         * sane hardware this is not an issue.
         */
        status = qla1280_64bit_start_scsi(ha, sp);
#else
        status = qla1280_32bit_start_scsi(ha, sp);
#endif
        return status;
}

enum action {
        ABORT_COMMAND,
        ABORT_DEVICE,
        DEVICE_RESET,
        BUS_RESET,
        ADAPTER_RESET,
        FAIL
};

/* timer action for error action processor */
static void qla1280_error_wait_timeout(unsigned long __data)
{
        struct scsi_cmnd *cmd = (struct scsi_cmnd *)__data;
        struct srb *sp = (struct srb *)CMD_SP(cmd);

        complete(sp->wait);
}

static void qla1280_mailbox_timeout(unsigned long __data)
{
        struct scsi_qla_host *ha = (struct scsi_qla_host *)__data;
        struct device_reg __iomem *reg;
        reg = ha->iobase;

        ha->mailbox_out[0] = RD_REG_WORD(&reg->mailbox0);
        printk(KERN_ERR "scsi(%ld): mailbox timed out, mailbox0 %04x, "
               "ictrl %04x, istatus %04x\n", ha->host_no, ha->mailbox_out[0],
               RD_REG_WORD(&reg->ictrl), RD_REG_WORD(&reg->istatus));
        complete(ha->mailbox_wait);
}

/**************************************************************************
 * qla1200_error_action
 *    The function will attempt to perform a specified error action and
 *    wait for the results (or time out).
 *
 * Input:
 *      cmd = Linux SCSI command packet of the command that cause the
 *            bus reset.
 *      action = error action to take (see action_t)
 *
 * Returns:
 *      SUCCESS or FAILED
 *
 * Note:
 *      Resetting the bus always succeeds - is has to, otherwise the
 *      kernel will panic! Try a surgical technique - sending a BUS
 *      DEVICE RESET message - on the offending target before pulling
 *      the SCSI bus reset line.
 **************************************************************************/
static int
qla1280_error_action(struct scsi_cmnd *cmd, enum action action)
{
        struct scsi_qla_host *ha;
        int bus, target, lun;
        struct srb *sp;
        uint16_t data;
        unsigned char *handle;
        int result, i;
        DECLARE_COMPLETION(wait);
        struct timer_list timer;

        ha = (struct scsi_qla_host *)(CMD_HOST(cmd)->hostdata);

        dprintk(4, "error_action %i, istatus 0x%04x\n", action,
                RD_REG_WORD(&ha->iobase->istatus));

        dprintk(4, "host_cmd 0x%04x, ictrl 0x%04x, jiffies %li\n",
                RD_REG_WORD(&ha->iobase->host_cmd),
                RD_REG_WORD(&ha->iobase->ictrl), jiffies);

        ENTER("qla1280_error_action");
        if (qla1280_verbose)
                printk(KERN_INFO "scsi(%li): Resetting Cmnd=0x%p, "
                       "Handle=0x%p, action=0x%x\n",
                       ha->host_no, cmd, CMD_HANDLE(cmd), action);

        if (cmd == NULL) {
                printk(KERN_WARNING "(scsi?:?:?:?) Reset called with NULL "
                       "si_Cmnd pointer, failing.\n");
                LEAVE("qla1280_error_action");
                return FAILED;
        }

        ha = (struct scsi_qla_host *)cmd->device->host->hostdata;
        sp = (struct srb *)CMD_SP(cmd);
        handle = CMD_HANDLE(cmd);

        /* Check for pending interrupts. */
        data = qla1280_debounce_register(&ha->iobase->istatus);
        /*
         * The io_request_lock is held when the reset handler is called, hence
         * the interrupt handler cannot be running in parallel as it also
         * grabs the lock. /Jes
         */
        if (data & RISC_INT)
                qla1280_isr(ha, &ha->done_q);

        /*
         * Determine the suggested action that the mid-level driver wants
         * us to perform.
         */
        if (handle == (unsigned char *)INVALID_HANDLE || handle == NULL) {
                if(action == ABORT_COMMAND) {
                        /* we never got this command */
                        printk(KERN_INFO "qla1280: Aborting a NULL handle\n");
                        return SUCCESS; /* no action - we don't have command */
                }
        } else {
                sp->wait = &wait;
        }

        bus = SCSI_BUS_32(cmd);
        target = SCSI_TCN_32(cmd);
        lun = SCSI_LUN_32(cmd);

        /* Overloading result.  Here it means the success or fail of the
         * *issue* of the action.  When we return from the routine, it must
         * mean the actual success or fail of the action */
        result = FAILED;
        switch (action) {
        case FAIL:
                break;

        case ABORT_COMMAND:
                if ((sp->flags & SRB_ABORT_PENDING)) {
                        printk(KERN_WARNING
                               "scsi(): Command has a pending abort "
                               "message - ABORT_PENDING.\n");
                        /* This should technically be impossible since we
                         * now wait for abort completion */
                        break;
                }

                for (i = 0; i < MAX_OUTSTANDING_COMMANDS; i++) {
                        if (sp == ha->outstanding_cmds[i]) {
                                dprintk(1, "qla1280: RISC aborting command\n");
                                if (qla1280_abort_command(ha, sp, i) == 0)
                                        result = SUCCESS;
                                else {
                                        /*
                                         * Since we don't know what might
                                         * have happend to the command, it
                                         * is unsafe to remove it from the
                                         * device's queue at this point.
                                         * Wait and let the escalation
                                         * process take care of it.
                                         */
                                        printk(KERN_WARNING
                                               "scsi(%li:%i:%i:%i): Unable"
                                               " to abort command!\n",
                                               ha->host_no, bus, target, lun);
                                }
                        }
                }
                break;

        case ABORT_DEVICE:
                if (qla1280_verbose)
                        printk(KERN_INFO
                               "scsi(%ld:%d:%d:%d): Queueing abort device "
                               "command.\n", ha->host_no, bus, target, lun);
                if (qla1280_abort_device(ha, bus, target, lun) == 0)
                        result = SUCCESS;
                break;

        case DEVICE_RESET:
                if (qla1280_verbose)
                        printk(KERN_INFO
                               "scsi(%ld:%d:%d:%d): Queueing device reset "
                               "command.\n", ha->host_no, bus, target, lun);
                if (qla1280_device_reset(ha, bus, target) == 0)
                        result = SUCCESS;
                break;

        case BUS_RESET:
                if (qla1280_verbose)
                        printk(KERN_INFO "qla1280(%ld:%d): Issuing BUS "
                               "DEVICE RESET\n", ha->host_no, bus);
                if (qla1280_bus_reset(ha, bus == 0))
                        result = SUCCESS;

                break;

        case ADAPTER_RESET:
        default:
                if (qla1280_verbose) {
                        printk(KERN_INFO
                               "scsi(%ld): Issued ADAPTER RESET\n",
                               ha->host_no);
                        printk(KERN_INFO "scsi(%ld): I/O processing will "
                               "continue automatically\n", ha->host_no);
                }
                ha->flags.reset_active = 1;
                /*
                 * We restarted all of the commands automatically, so the
                 * mid-level code can expect completions momentitarily.
                 */
                if (qla1280_abort_isp(ha) == 0)
                        result = SUCCESS;

                ha->flags.reset_active = 0;
        }

        if (!list_empty(&ha->done_q))
                qla1280_done(ha);

        /* If we didn't manage to issue the action, or we have no
         * command to wait for, exit here */
        if (result == FAILED || handle == NULL ||
            handle == (unsigned char *)INVALID_HANDLE) {
                /*
                 * Clear completion queue to avoid qla1280_done() trying
                 * to complete the command at a later stage after we
                 * have exited the current context
                 */
                sp->wait = NULL;
                goto leave;
        }

        /* set up a timer just in case we're really jammed */
        init_timer(&timer);
        timer.expires = jiffies + 4*HZ;
        timer.data = (unsigned long)cmd;
        timer.function = qla1280_error_wait_timeout;
        add_timer(&timer);

        /* wait for the action to complete (or the timer to expire) */
        spin_unlock_irq(ha->host->host_lock);
        wait_for_completion(&wait);
        del_timer_sync(&timer);
        spin_lock_irq(ha->host->host_lock);
        sp->wait = NULL;

        /* the only action we might get a fail for is abort */
        if (action == ABORT_COMMAND) {
                if(sp->flags & SRB_ABORTED)
                        result = SUCCESS;
                else
                        result = FAILED;
        }

 leave:
        dprintk(1, "RESET returning %d\n", result);

        LEAVE("qla1280_error_action");
        return result;
}

/**************************************************************************
 *   qla1280_abort
 *     Abort the specified SCSI command(s).
 **************************************************************************/
static int
qla1280_eh_abort(struct scsi_cmnd * cmd)
{
        int rc;

        spin_lock_irq(cmd->device->host->host_lock);
        rc = qla1280_error_action(cmd, ABORT_COMMAND);
        spin_unlock_irq(cmd->device->host->host_lock);

        return rc;
}

/**************************************************************************
 *   qla1280_device_reset
 *     Reset the specified SCSI device
 **************************************************************************/
static int
qla1280_eh_device_reset(struct scsi_cmnd *cmd)
{
        int rc;

        spin_lock_irq(cmd->device->host->host_lock);
        rc = qla1280_error_action(cmd, DEVICE_RESET);
        spin_unlock_irq(cmd->device->host->host_lock);

        return rc;
}

/**************************************************************************
 *   qla1280_bus_reset
 *     Reset the specified bus.
 **************************************************************************/
static int
qla1280_eh_bus_reset(struct scsi_cmnd *cmd)
{
        int rc;

        spin_lock_irq(cmd->device->host->host_lock);
        rc = qla1280_error_action(cmd, BUS_RESET);
        spin_unlock_irq(cmd->device->host->host_lock);

        return rc;
}

/**************************************************************************
 *   qla1280_adapter_reset
 *     Reset the specified adapter (both channels)
 **************************************************************************/
static int
qla1280_eh_adapter_reset(struct scsi_cmnd *cmd)
{
        int rc;

        spin_lock_irq(cmd->device->host->host_lock);
        rc = qla1280_error_action(cmd, ADAPTER_RESET);
        spin_unlock_irq(cmd->device->host->host_lock);

        return rc;
}

static int
qla1280_biosparam(struct scsi_device *sdev, struct block_device *bdev,
                  sector_t capacity, int geom[])
{
        int heads, sectors, cylinders;

        heads = 64;
        sectors = 32;
        cylinders = (unsigned long)capacity / (heads * sectors);
        if (cylinders > 1024) {
                heads = 255;
                sectors = 63;
                cylinders = (unsigned long)capacity / (heads * sectors);
                /* if (cylinders > 1023)
                   cylinders = 1023; */
        }

        geom[0] = heads;
        geom[1] = sectors;
        geom[2] = cylinders;

        return 0;
}

 
/* disable risc and host interrupts */
static inline void
qla1280_disable_intrs(struct scsi_qla_host *ha)
{
        WRT_REG_WORD(&ha->iobase->ictrl, 0);
        RD_REG_WORD(&ha->iobase->ictrl);        /* PCI Posted Write flush */
}

/* enable risc and host interrupts */
static inline void
qla1280_enable_intrs(struct scsi_qla_host *ha)
{
        WRT_REG_WORD(&ha->iobase->ictrl, (ISP_EN_INT | ISP_EN_RISC));
        RD_REG_WORD(&ha->iobase->ictrl);        /* PCI Posted Write flush */
}

/**************************************************************************
 * qla1280_intr_handler
 *   Handles the H/W interrupt
 **************************************************************************/
static irqreturn_t
qla1280_intr_handler(int irq, void *dev_id, struct pt_regs *regs)
{
        struct scsi_qla_host *ha;
        struct device_reg __iomem *reg;
        u16 data;
        int handled = 0;

        ENTER_INTR ("qla1280_intr_handler");
        ha = (struct scsi_qla_host *)dev_id;

        spin_lock(ha->host->host_lock);

        ha->isr_count++;
        reg = ha->iobase;

        qla1280_disable_intrs(ha);

        data = qla1280_debounce_register(&reg->istatus);
        /* Check for pending interrupts. */
        if (data & RISC_INT) {  
                qla1280_isr(ha, &ha->done_q);
                handled = 1;
        }
        if (!list_empty(&ha->done_q))
                qla1280_done(ha);

        spin_unlock(ha->host->host_lock);

        qla1280_enable_intrs(ha);

        LEAVE_INTR("qla1280_intr_handler");
        return IRQ_RETVAL(handled);
}


static int
qla1280_set_target_parameters(struct scsi_qla_host *ha, int bus, int target)
{
        uint8_t mr;
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        struct nvram *nv;
        int status, lun;

        nv = &ha->nvram;

        mr = BIT_3 | BIT_2 | BIT_1 | BIT_0;

        /* Set Target Parameters. */
        mb[0] = MBC_SET_TARGET_PARAMETERS;
        mb[1] = (uint16_t)((bus ? target | BIT_7 : target) << 8);
        mb[2] = nv->bus[bus].target[target].parameter.renegotiate_on_error << 8;
        mb[2] |= nv->bus[bus].target[target].parameter.stop_queue_on_check << 9;
        mb[2] |= nv->bus[bus].target[target].parameter.auto_request_sense << 10;
        mb[2] |= nv->bus[bus].target[target].parameter.tag_queuing << 11;
        mb[2] |= nv->bus[bus].target[target].parameter.enable_sync << 12;
        mb[2] |= nv->bus[bus].target[target].parameter.enable_wide << 13;
        mb[2] |= nv->bus[bus].target[target].parameter.parity_checking << 14;
        mb[2] |= nv->bus[bus].target[target].parameter.disconnect_allowed << 15;

        if (IS_ISP1x160(ha)) {
                mb[2] |= nv->bus[bus].target[target].ppr_1x160.flags.enable_ppr << 5;
                mb[3] = (nv->bus[bus].target[target].flags.flags1x160.sync_offset << 8);
                mb[6] = (nv->bus[bus].target[target].ppr_1x160.flags.ppr_options << 8) |
                         nv->bus[bus].target[target].ppr_1x160.flags.ppr_bus_width;
                mr |= BIT_6;
        } else {
                mb[3] = (nv->bus[bus].target[target].flags.flags1x80.sync_offset << 8);
        }
        mb[3] |= nv->bus[bus].target[target].sync_period;

        status = qla1280_mailbox_command(ha, mr, mb);

        /* Set Device Queue Parameters. */
        for (lun = 0; lun < MAX_LUNS; lun++) {
                mb[0] = MBC_SET_DEVICE_QUEUE;
                mb[1] = (uint16_t)((bus ? target | BIT_7 : target) << 8);
                mb[1] |= lun;
                mb[2] = nv->bus[bus].max_queue_depth;
                mb[3] = nv->bus[bus].target[target].execution_throttle;
                status |= qla1280_mailbox_command(ha, 0x0f, mb);
        }

        if (status)
                printk(KERN_WARNING "scsi(%ld:%i:%i): "
                       "qla1280_set_target_parameters() failed\n",
                       ha->host_no, bus, target);
        return status;
}


/**************************************************************************
 *   qla1280_slave_configure
 *
 * Description:
 *   Determines the queue depth for a given device.  There are two ways
 *   a queue depth can be obtained for a tagged queueing device.  One
 *   way is the default queue depth which is determined by whether
 *   If it is defined, then it is used
 *   as the default queue depth.  Otherwise, we use either 4 or 8 as the
 *   default queue depth (dependent on the number of hardware SCBs).
 **************************************************************************/
static int
qla1280_slave_configure(struct scsi_device *device)
{
        struct scsi_qla_host *ha;
        int default_depth = 3;
        int bus = device->channel;
        int target = device->id;
        int status = 0;
        struct nvram *nv;
        unsigned long flags;

        ha = (struct scsi_qla_host *)device->host->hostdata;
        nv = &ha->nvram;

        if (qla1280_check_for_dead_scsi_bus(ha, bus))
                return 1;

        if (device->tagged_supported &&
            (ha->bus_settings[bus].qtag_enables & (BIT_0 << target))) {
                scsi_adjust_queue_depth(device, MSG_ORDERED_TAG,
                                        ha->bus_settings[bus].hiwat);
        } else {
                scsi_adjust_queue_depth(device, 0, default_depth);
        }

        nv->bus[bus].target[target].parameter.enable_sync = device->sdtr;
        nv->bus[bus].target[target].parameter.enable_wide = device->wdtr;
        nv->bus[bus].target[target].ppr_1x160.flags.enable_ppr = device->ppr;

        if (driver_setup.no_sync ||
            (driver_setup.sync_mask &&
             (~driver_setup.sync_mask & (1 << target))))
                nv->bus[bus].target[target].parameter.enable_sync = 0;
        if (driver_setup.no_wide ||
            (driver_setup.wide_mask &&
             (~driver_setup.wide_mask & (1 << target))))
                nv->bus[bus].target[target].parameter.enable_wide = 0;
        if (IS_ISP1x160(ha)) {
                if (driver_setup.no_ppr ||
                    (driver_setup.ppr_mask &&
                     (~driver_setup.ppr_mask & (1 << target))))
                        nv->bus[bus].target[target].ppr_1x160.flags.enable_ppr = 0;
        }

        spin_lock_irqsave(ha->host->host_lock, flags);
        if (nv->bus[bus].target[target].parameter.enable_sync)
                status = qla1280_set_target_parameters(ha, bus, target);
        qla1280_get_target_parameters(ha, device);
        spin_unlock_irqrestore(ha->host->host_lock, flags);
        return status;
}


/*
 * qla1280_done
 *      Process completed commands.
 *
 * Input:
 *      ha           = adapter block pointer.
 */
static void
qla1280_done(struct scsi_qla_host *ha)
{
        struct srb *sp;
        struct list_head *done_q;
        int bus, target, lun;
        struct scsi_cmnd *cmd;

        ENTER("qla1280_done");

        done_q = &ha->done_q;

        while (!list_empty(done_q)) {
                sp = list_entry(done_q->next, struct srb, list);

                list_del(&sp->list);
        
                cmd = sp->cmd;
                bus = SCSI_BUS_32(cmd);
                target = SCSI_TCN_32(cmd);
                lun = SCSI_LUN_32(cmd);

                switch ((CMD_RESULT(cmd) >> 16)) {
                case DID_RESET:
                        /* Issue marker command. */
                        qla1280_marker(ha, bus, target, 0, MK_SYNC_ID);
                        break;
                case DID_ABORT:
                        sp->flags &= ~SRB_ABORT_PENDING;
                        sp->flags |= SRB_ABORTED;
                        if (sp->flags & SRB_TIMEOUT)
                                CMD_RESULT(sp->cmd) = DID_TIME_OUT << 16;
                        break;
                default:
                        break;
                }

                /* Release memory used for this I/O */
                if (cmd->use_sg) {
                        pci_unmap_sg(ha->pdev, cmd->request_buffer,
                                        cmd->use_sg, cmd->sc_data_direction);
                } else if (cmd->request_bufflen) {
                        pci_unmap_single(ha->pdev, sp->saved_dma_handle,
                                        cmd->request_bufflen,
                                        cmd->sc_data_direction);
                }

                /* Call the mid-level driver interrupt handler */
                CMD_HANDLE(sp->cmd) = (unsigned char *)INVALID_HANDLE;
                ha->actthreads--;

                (*(cmd)->scsi_done)(cmd);

                if(sp->wait != NULL)
                        complete(sp->wait);
        }
        LEAVE("qla1280_done");
}

/*
 * Translates a ISP error to a Linux SCSI error
 */
static int
qla1280_return_status(struct response * sts, struct scsi_cmnd *cp)
{
        int host_status = DID_ERROR;
        uint16_t comp_status = le16_to_cpu(sts->comp_status);
        uint16_t state_flags = le16_to_cpu(sts->state_flags);
        uint16_t residual_length = le32_to_cpu(sts->residual_length);
        uint16_t scsi_status = le16_to_cpu(sts->scsi_status);
#if DEBUG_QLA1280_INTR
        static char *reason[] = {
                "DID_OK",
                "DID_NO_CONNECT",
                "DID_BUS_BUSY",
                "DID_TIME_OUT",
                "DID_BAD_TARGET",
                "DID_ABORT",
                "DID_PARITY",
                "DID_ERROR",
                "DID_RESET",
                "DID_BAD_INTR"
        };
#endif                          /* DEBUG_QLA1280_INTR */

        ENTER("qla1280_return_status");

#if DEBUG_QLA1280_INTR
        /*
          dprintk(1, "qla1280_return_status: compl status = 0x%04x\n",
          comp_status);
        */
#endif

        switch (comp_status) {
        case CS_COMPLETE:
                host_status = DID_OK;
                break;

        case CS_INCOMPLETE:
                if (!(state_flags & SF_GOT_BUS))
                        host_status = DID_NO_CONNECT;
                else if (!(state_flags & SF_GOT_TARGET))
                        host_status = DID_BAD_TARGET;
                else if (!(state_flags & SF_SENT_CDB))
                        host_status = DID_ERROR;
                else if (!(state_flags & SF_TRANSFERRED_DATA))
                        host_status = DID_ERROR;
                else if (!(state_flags & SF_GOT_STATUS))
                        host_status = DID_ERROR;
                else if (!(state_flags & SF_GOT_SENSE))
                        host_status = DID_ERROR;
                break;

        case CS_RESET:
                host_status = DID_RESET;
                break;

        case CS_ABORTED:
                host_status = DID_ABORT;
                break;

        case CS_TIMEOUT:
                host_status = DID_TIME_OUT;
                break;

        case CS_DATA_OVERRUN:
                dprintk(2, "Data overrun 0x%x\n", residual_length);
                dprintk(2, "qla1280_return_status: response packet data\n");
                qla1280_dump_buffer(2, (char *)sts, RESPONSE_ENTRY_SIZE);
                host_status = DID_ERROR;
                break;

        case CS_DATA_UNDERRUN:
                if ((cp->request_bufflen - residual_length) <
                    cp->underflow) {
                        printk(KERN_WARNING
                               "scsi: Underflow detected - retrying "
                               "command.\n");
                        host_status = DID_ERROR;
                } else
                        host_status = DID_OK;
                break;

        default:
                host_status = DID_ERROR;
                break;
        }

#if DEBUG_QLA1280_INTR
        dprintk(1, "qla1280 ISP status: host status (%s) scsi status %x\n",
                reason[host_status], scsi_status);
#endif

        LEAVE("qla1280_return_status");

        return (scsi_status & 0xff) | (host_status << 16);
}

/****************************************************************************/
/*                QLogic ISP1280 Hardware Support Functions.                */
/****************************************************************************/

/*
 * qla1280_initialize_adapter
 *      Initialize board.
 *
 * Input:
 *      ha = adapter block pointer.
 *
 * Returns:
 *      0 = success
 */
static int __devinit
qla1280_initialize_adapter(struct scsi_qla_host *ha)
{
        struct device_reg __iomem *reg;
        int status;
        int bus;
        unsigned long flags;

        ENTER("qla1280_initialize_adapter");

        /* Clear adapter flags. */
        ha->flags.online = 0;
        ha->flags.disable_host_adapter = 0;
        ha->flags.reset_active = 0;
        ha->flags.abort_isp_active = 0;

#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
        if (ia64_platform_is("sn2")) {
                printk(KERN_INFO "scsi(%li): Enabling SN2 PCI DMA "
                       "dual channel lockup workaround\n", ha->host_no);
                ha->flags.use_pci_vchannel = 1;
                driver_setup.no_nvram = 1;
        }
#endif

        /* TODO: implement support for the 1040 nvram format */
        if (IS_ISP1040(ha))
                driver_setup.no_nvram = 1;

        dprintk(1, "Configure PCI space for adapter...\n");

        reg = ha->iobase;

        /* Insure mailbox registers are free. */
        WRT_REG_WORD(&reg->semaphore, 0);
        WRT_REG_WORD(&reg->host_cmd, HC_CLR_RISC_INT);
        WRT_REG_WORD(&reg->host_cmd, HC_CLR_HOST_INT);
        RD_REG_WORD(&reg->host_cmd);

        if (qla1280_read_nvram(ha)) {
                dprintk(2, "qla1280_initialize_adapter: failed to read "
                        "NVRAM\n");
        }

        /*
         * It's necessary to grab the spin here as qla1280_mailbox_command
         * needs to be able to drop the lock unconditionally to wait
         * for completion.
         */
        spin_lock_irqsave(ha->host->host_lock, flags);

        status = qla1280_load_firmware(ha);
        if (status) {
                printk(KERN_ERR "scsi(%li): initialize: pci probe failed!\n",
                       ha->host_no);
                goto out;
        }

        /* Setup adapter based on NVRAM parameters. */
        dprintk(1, "scsi(%ld): Configure NVRAM parameters\n", ha->host_no);
        qla1280_nvram_config(ha);

        if (ha->flags.disable_host_adapter) {
                status = 1;
                goto out;
        }

        status = qla1280_init_rings(ha);
        if (status)
                goto out;

        /* Issue SCSI reset, if we can't reset twice then bus is dead */
        for (bus = 0; bus < ha->ports; bus++) {
                if (!ha->bus_settings[bus].disable_scsi_reset &&
                    qla1280_bus_reset(ha, bus) &&
                    qla1280_bus_reset(ha, bus))
                        ha->bus_settings[bus].scsi_bus_dead = 1;
        }

        ha->flags.online = 1;
 out:
        spin_unlock_irqrestore(ha->host->host_lock, flags);

        if (status)
                dprintk(2, "qla1280_initialize_adapter: **** FAILED ****\n");

        LEAVE("qla1280_initialize_adapter");
        return status;
}

/*
 * Chip diagnostics
 *      Test chip for proper operation.
 *
 * Input:
 *      ha = adapter block pointer.
 *
 * Returns:
 *      0 = success.
 */
static int
qla1280_chip_diag(struct scsi_qla_host *ha)
{
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        struct device_reg __iomem *reg = ha->iobase;
        int status = 0;
        int cnt;
        uint16_t data;
        dprintk(3, "qla1280_chip_diag: testing device at 0x%p \n", &reg->id_l);

        dprintk(1, "scsi(%ld): Verifying chip\n", ha->host_no);

        /* Soft reset chip and wait for it to finish. */
        WRT_REG_WORD(&reg->ictrl, ISP_RESET);

        /*
         * We can't do a traditional PCI write flush here by reading
         * back the register. The card will not respond once the reset
         * is in action and we end up with a machine check exception
         * instead. Nothing to do but wait and hope for the best.
         * A portable pci_write_flush(pdev) call would be very useful here.
         */
        udelay(20);
        data = qla1280_debounce_register(&reg->ictrl);
        /*
         * Yet another QLogic gem ;-(
         */
        for (cnt = 1000000; cnt && data & ISP_RESET; cnt--) {
                udelay(5);
                data = RD_REG_WORD(&reg->ictrl);
        }

        if (!cnt)
                goto fail;

        /* Reset register cleared by chip reset. */
        dprintk(3, "qla1280_chip_diag: reset register cleared by chip reset\n");

        WRT_REG_WORD(&reg->cfg_1, 0);

        /* Reset RISC and disable BIOS which
           allows RISC to execute out of RAM. */
        WRT_REG_WORD(&reg->host_cmd, HC_RESET_RISC |
                     HC_RELEASE_RISC | HC_DISABLE_BIOS);

        RD_REG_WORD(&reg->id_l);        /* Flush PCI write */
        data = qla1280_debounce_register(&reg->mailbox0);

        /*
         * I *LOVE* this code!
         */
        for (cnt = 1000000; cnt && data == MBS_BUSY; cnt--) {
                udelay(5);
                data = RD_REG_WORD(&reg->mailbox0);
        }

        if (!cnt)
                goto fail;

        /* Check product ID of chip */
        dprintk(3, "qla1280_chip_diag: Checking product ID of chip\n");

        if (RD_REG_WORD(&reg->mailbox1) != PROD_ID_1 ||
            (RD_REG_WORD(&reg->mailbox2) != PROD_ID_2 &&
             RD_REG_WORD(&reg->mailbox2) != PROD_ID_2a) ||
            RD_REG_WORD(&reg->mailbox3) != PROD_ID_3 ||
            RD_REG_WORD(&reg->mailbox4) != PROD_ID_4) {
                printk(KERN_INFO "qla1280: Wrong product ID = "
                       "0x%x,0x%x,0x%x,0x%x\n",
                       RD_REG_WORD(&reg->mailbox1),
                       RD_REG_WORD(&reg->mailbox2),
                       RD_REG_WORD(&reg->mailbox3),
                       RD_REG_WORD(&reg->mailbox4));
                goto fail;
        }

        /*
         * Enable ints early!!!
         */
        qla1280_enable_intrs(ha);

        dprintk(1, "qla1280_chip_diag: Checking mailboxes of chip\n");
        /* Wrap Incoming Mailboxes Test. */
        mb[0] = MBC_MAILBOX_REGISTER_TEST;
        mb[1] = 0xAAAA;
        mb[2] = 0x5555;
        mb[3] = 0xAA55;
        mb[4] = 0x55AA;
        mb[5] = 0xA5A5;
        mb[6] = 0x5A5A;
        mb[7] = 0x2525;

        status = qla1280_mailbox_command(ha, 0xff, mb);
        if (status)
                goto fail;

        if (mb[1] != 0xAAAA || mb[2] != 0x5555 || mb[3] != 0xAA55 ||
            mb[4] != 0x55AA || mb[5] != 0xA5A5 || mb[6] != 0x5A5A ||
            mb[7] != 0x2525) {
                printk(KERN_INFO "qla1280: Failed mbox check\n");
                goto fail;
        }

        dprintk(3, "qla1280_chip_diag: exiting normally\n");
        return 0;
 fail:
        dprintk(2, "qla1280_chip_diag: **** FAILED ****\n");
        return status;
}

static int
qla1280_load_firmware_pio(struct scsi_qla_host *ha)
{
        uint16_t risc_address, *risc_code_address, risc_code_size;
        uint16_t mb[MAILBOX_REGISTER_COUNT], i;
        int err;

        /* Load RISC code. */
        risc_address = *ql1280_board_tbl[ha->devnum].fwstart;
        risc_code_address = ql1280_board_tbl[ha->devnum].fwcode;
        risc_code_size = *ql1280_board_tbl[ha->devnum].fwlen;

        for (i = 0; i < risc_code_size; i++) {
                mb[0] = MBC_WRITE_RAM_WORD;
                mb[1] = risc_address + i;
                mb[2] = risc_code_address[i];

                err = qla1280_mailbox_command(ha, BIT_0 | BIT_1 | BIT_2, mb);
                if (err) {
                        printk(KERN_ERR "scsi(%li): Failed to load firmware\n",
                                        ha->host_no);
                        return err;
                }
        }

        return 0;
}

#define DUMP_IT_BACK 0          /* for debug of RISC loading */
static int
qla1280_load_firmware_dma(struct scsi_qla_host *ha)
{
        uint16_t risc_address, *risc_code_address, risc_code_size;
        uint16_t mb[MAILBOX_REGISTER_COUNT], cnt;
        int err = 0, num, i;
#if DUMP_IT_BACK
        uint8_t *sp, *tbuf;
        dma_addr_t p_tbuf;

        tbuf = pci_alloc_consistent(ha->pdev, 8000, &p_tbuf);
        if (!tbuf)
                return -ENOMEM;
#endif

        /* Load RISC code. */
        risc_address = *ql1280_board_tbl[ha->devnum].fwstart;
        risc_code_address = ql1280_board_tbl[ha->devnum].fwcode;
        risc_code_size = *ql1280_board_tbl[ha->devnum].fwlen;

        dprintk(1, "%s: DMA RISC code (%i) words\n",
                        __FUNCTION__, risc_code_size);

        num = 0;
        while (risc_code_size > 0) {
                int warn __attribute__((unused)) = 0;

                cnt = 2000 >> 1;

                if (cnt > risc_code_size)
                        cnt = risc_code_size;

                dprintk(2, "qla1280_setup_chip:  loading risc @ =(0x%p),"
                        "%d,%d(0x%x)\n",
                        risc_code_address, cnt, num, risc_address);
                for(i = 0; i < cnt; i++)
                        ((__le16 *)ha->request_ring)[i] =
                                cpu_to_le16(risc_code_address[i]);

                mb[0] = MBC_LOAD_RAM;
                mb[1] = risc_address;
                mb[4] = cnt;
                mb[3] = ha->request_dma & 0xffff;
                mb[2] = (ha->request_dma >> 16) & 0xffff;
                mb[7] = pci_dma_hi32(ha->request_dma) & 0xffff;
                mb[6] = pci_dma_hi32(ha->request_dma) >> 16;
                dprintk(2, "%s: op=%d  0x%p = 0x%4x,0x%4x,0x%4x,0x%4x\n",
                                __FUNCTION__, mb[0],
                                (void *)(long)ha->request_dma,
                                mb[6], mb[7], mb[2], mb[3]);
                err = qla1280_mailbox_command(ha, BIT_4 | BIT_3 | BIT_2 |
                                BIT_1 | BIT_0, mb);
                if (err) {
                        printk(KERN_ERR "scsi(%li): Failed to load partial "
                               "segment of f\n", ha->host_no);
                        goto out;
                }

#if DUMP_IT_BACK
                mb[0] = MBC_DUMP_RAM;
                mb[1] = risc_address;
                mb[4] = cnt;
                mb[3] = p_tbuf & 0xffff;
                mb[2] = (p_tbuf >> 16) & 0xffff;
                mb[7] = pci_dma_hi32(p_tbuf) & 0xffff;
                mb[6] = pci_dma_hi32(p_tbuf) >> 16;

                err = qla1280_mailbox_command(ha, BIT_4 | BIT_3 | BIT_2 |
                                BIT_1 | BIT_0, mb);
                if (err) {
                        printk(KERN_ERR
                               "Failed to dump partial segment of f/w\n");
                        goto out;
                }
                sp = (uint8_t *)ha->request_ring;
                for (i = 0; i < (cnt << 1); i++) {
                        if (tbuf[i] != sp[i] && warn++ < 10) {
                                printk(KERN_ERR "%s: FW compare error @ "
                                                "byte(0x%x) loop#=%x\n",
                                                __FUNCTION__, i, num);
                                printk(KERN_ERR "%s: FWbyte=%x  "
                                                "FWfromChip=%x\n",
                                                __FUNCTION__, sp[i], tbuf[i]);
                                /*break; */
                        }
                }
#endif
                risc_address += cnt;
                risc_code_size = risc_code_size - cnt;
                risc_code_address = risc_code_address + cnt;
                num++;
        }

 out:
#if DUMP_IT_BACK
        pci_free_consistent(ha->pdev, 8000, tbuf, p_tbuf);
#endif
        return err;
}

static int
qla1280_start_firmware(struct scsi_qla_host *ha)
{
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        int err;

        dprintk(1, "%s: Verifying checksum of loaded RISC code.\n",
                        __FUNCTION__);

        /* Verify checksum of loaded RISC code. */
        mb[0] = MBC_VERIFY_CHECKSUM;
        /* mb[1] = ql12_risc_code_addr01; */
        mb[1] = *ql1280_board_tbl[ha->devnum].fwstart;
        err = qla1280_mailbox_command(ha, BIT_1 | BIT_0, mb);
        if (err) {
                printk(KERN_ERR "scsi(%li): RISC checksum failed.\n", ha->host_no);
                return err;
        }

        /* Start firmware execution. */
        dprintk(1, "%s: start firmware running.\n", __FUNCTION__);
        mb[0] = MBC_EXECUTE_FIRMWARE;
        mb[1] = *ql1280_board_tbl[ha->devnum].fwstart;
        err = qla1280_mailbox_command(ha, BIT_1 | BIT_0, &mb[0]);
        if (err) {
                printk(KERN_ERR "scsi(%li): Failed to start firmware\n",
                                ha->host_no);
        }

        return err;
}

static int
qla1280_load_firmware(struct scsi_qla_host *ha)
{
        int err;

        err = qla1280_chip_diag(ha);
        if (err)
                goto out;
        if (IS_ISP1040(ha))
                err = qla1280_load_firmware_pio(ha);
        else
                err = qla1280_load_firmware_dma(ha);
        if (err)
                goto out;
        err = qla1280_start_firmware(ha);
 out:
        return err;
}

/*
 * Initialize rings
 *
 * Input:
 *      ha                = adapter block pointer.
 *      ha->request_ring  = request ring virtual address
 *      ha->response_ring = response ring virtual address
 *      ha->request_dma   = request ring physical address
 *      ha->response_dma  = response ring physical address
 *
 * Returns:
 *      0 = success.
 */
static int
qla1280_init_rings(struct scsi_qla_host *ha)
{
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        int status = 0;

        ENTER("qla1280_init_rings");

        /* Clear outstanding commands array. */
        memset(ha->outstanding_cmds, 0,
               sizeof(struct srb *) * MAX_OUTSTANDING_COMMANDS);

        /* Initialize request queue. */
        ha->request_ring_ptr = ha->request_ring;
        ha->req_ring_index = 0;
        ha->req_q_cnt = REQUEST_ENTRY_CNT;
        /* mb[0] = MBC_INIT_REQUEST_QUEUE; */
        mb[0] = MBC_INIT_REQUEST_QUEUE_A64;
        mb[1] = REQUEST_ENTRY_CNT;
        mb[3] = ha->request_dma & 0xffff;
        mb[2] = (ha->request_dma >> 16) & 0xffff;
        mb[4] = 0;
        mb[7] = pci_dma_hi32(ha->request_dma) & 0xffff;
        mb[6] = pci_dma_hi32(ha->request_dma) >> 16;
        if (!(status = qla1280_mailbox_command(ha, BIT_7 | BIT_6 | BIT_4 |
                                               BIT_3 | BIT_2 | BIT_1 | BIT_0,
                                               &mb[0]))) {
                /* Initialize response queue. */
                ha->response_ring_ptr = ha->response_ring;
                ha->rsp_ring_index = 0;
                /* mb[0] = MBC_INIT_RESPONSE_QUEUE; */
                mb[0] = MBC_INIT_RESPONSE_QUEUE_A64;
                mb[1] = RESPONSE_ENTRY_CNT;
                mb[3] = ha->response_dma & 0xffff;
                mb[2] = (ha->response_dma >> 16) & 0xffff;
                mb[5] = 0;
                mb[7] = pci_dma_hi32(ha->response_dma) & 0xffff;
                mb[6] = pci_dma_hi32(ha->response_dma) >> 16;
                status = qla1280_mailbox_command(ha, BIT_7 | BIT_6 | BIT_5 |
                                                 BIT_3 | BIT_2 | BIT_1 | BIT_0,
                                                 &mb[0]);
        }

        if (status)
                dprintk(2, "qla1280_init_rings: **** FAILED ****\n");

        LEAVE("qla1280_init_rings");
        return status;
}

static void
qla1280_print_settings(struct nvram *nv)
{
        dprintk(1, "qla1280 : initiator scsi id bus[0]=%d\n",
                nv->bus[0].config_1.initiator_id);
        dprintk(1, "qla1280 : initiator scsi id bus[1]=%d\n",
                nv->bus[1].config_1.initiator_id);

        dprintk(1, "qla1280 : bus reset delay[0]=%d\n",
                nv->bus[0].bus_reset_delay);
        dprintk(1, "qla1280 : bus reset delay[1]=%d\n",
                nv->bus[1].bus_reset_delay);

        dprintk(1, "qla1280 : retry count[0]=%d\n", nv->bus[0].retry_count);
        dprintk(1, "qla1280 : retry delay[0]=%d\n", nv->bus[0].retry_delay);
        dprintk(1, "qla1280 : retry count[1]=%d\n", nv->bus[1].retry_count);
        dprintk(1, "qla1280 : retry delay[1]=%d\n", nv->bus[1].retry_delay);

        dprintk(1, "qla1280 : async data setup time[0]=%d\n",
                nv->bus[0].config_2.async_data_setup_time);
        dprintk(1, "qla1280 : async data setup time[1]=%d\n",
                nv->bus[1].config_2.async_data_setup_time);

        dprintk(1, "qla1280 : req/ack active negation[0]=%d\n",
                nv->bus[0].config_2.req_ack_active_negation);
        dprintk(1, "qla1280 : req/ack active negation[1]=%d\n",
                nv->bus[1].config_2.req_ack_active_negation);

        dprintk(1, "qla1280 : data line active negation[0]=%d\n",
                nv->bus[0].config_2.data_line_active_negation);
        dprintk(1, "qla1280 : data line active negation[1]=%d\n",
                nv->bus[1].config_2.data_line_active_negation);

        dprintk(1, "qla1280 : disable loading risc code=%d\n",
                nv->cntr_flags_1.disable_loading_risc_code);

        dprintk(1, "qla1280 : enable 64bit addressing=%d\n",
                nv->cntr_flags_1.enable_64bit_addressing);

        dprintk(1, "qla1280 : selection timeout limit[0]=%d\n",
                nv->bus[0].selection_timeout);
        dprintk(1, "qla1280 : selection timeout limit[1]=%d\n",
                nv->bus[1].selection_timeout);

        dprintk(1, "qla1280 : max queue depth[0]=%d\n",
                nv->bus[0].max_queue_depth);
        dprintk(1, "qla1280 : max queue depth[1]=%d\n",
                nv->bus[1].max_queue_depth);
}

static void
qla1280_set_target_defaults(struct scsi_qla_host *ha, int bus, int target)
{
        struct nvram *nv = &ha->nvram;

        nv->bus[bus].target[target].parameter.renegotiate_on_error = 1;
        nv->bus[bus].target[target].parameter.auto_request_sense = 1;
        nv->bus[bus].target[target].parameter.tag_queuing = 1;
        nv->bus[bus].target[target].parameter.enable_sync = 1;
#if 1   /* Some SCSI Processors do not seem to like this */
        nv->bus[bus].target[target].parameter.enable_wide = 1;
#endif
        nv->bus[bus].target[target].execution_throttle =
                nv->bus[bus].max_queue_depth - 1;
        nv->bus[bus].target[target].parameter.parity_checking = 1;
        nv->bus[bus].target[target].parameter.disconnect_allowed = 1;

        if (IS_ISP1x160(ha)) {
                nv->bus[bus].target[target].flags.flags1x160.device_enable = 1;
                nv->bus[bus].target[target].flags.flags1x160.sync_offset = 0x0e;
                nv->bus[bus].target[target].sync_period = 9;
                nv->bus[bus].target[target].ppr_1x160.flags.enable_ppr = 1;
                nv->bus[bus].target[target].ppr_1x160.flags.ppr_options = 2;
                nv->bus[bus].target[target].ppr_1x160.flags.ppr_bus_width = 1;
        } else {
                nv->bus[bus].target[target].flags.flags1x80.device_enable = 1;
                nv->bus[bus].target[target].flags.flags1x80.sync_offset = 12;
                nv->bus[bus].target[target].sync_period = 10;
        }
}

static void
qla1280_set_defaults(struct scsi_qla_host *ha)
{
        struct nvram *nv = &ha->nvram;
        int bus, target;

        dprintk(1, "Using defaults for NVRAM: \n");
        memset(nv, 0, sizeof(struct nvram));

        /* nv->cntr_flags_1.disable_loading_risc_code = 1; */
        nv->firmware_feature.f.enable_fast_posting = 1;
        nv->firmware_feature.f.disable_synchronous_backoff = 1;
        nv->termination.scsi_bus_0_control = 3;
        nv->termination.scsi_bus_1_control = 3;
        nv->termination.auto_term_support = 1;

        /*
         * Set default FIFO magic - What appropriate values would be here
         * is unknown. This is what I have found testing with 12160s.
         *
         * Now, I would love the magic decoder ring for this one, the
         * header file provided by QLogic seems to be bogus or incomplete
         * at best.
         */
        nv->isp_config.burst_enable = 1;
        if (IS_ISP1040(ha))
                nv->isp_config.fifo_threshold |= 3;
        else
                nv->isp_config.fifo_threshold |= 4;

        if (IS_ISP1x160(ha))
                nv->isp_parameter = 0x01; /* fast memory enable */

        for (bus = 0; bus < MAX_BUSES; bus++) {
                nv->bus[bus].config_1.initiator_id = 7;
                nv->bus[bus].config_2.req_ack_active_negation = 1;
                nv->bus[bus].config_2.data_line_active_negation = 1;
                nv->bus[bus].selection_timeout = 250;
                nv->bus[bus].max_queue_depth = 256;

                if (IS_ISP1040(ha)) {
                        nv->bus[bus].bus_reset_delay = 3;
                        nv->bus[bus].config_2.async_data_setup_time = 6;
                        nv->bus[bus].retry_delay = 1;
                } else {
                        nv->bus[bus].bus_reset_delay = 5;
                        nv->bus[bus].config_2.async_data_setup_time = 8;
                }

                for (target = 0; target < MAX_TARGETS; target++)
                        qla1280_set_target_defaults(ha, bus, target);
        }
}

static int
qla1280_config_target(struct scsi_qla_host *ha, int bus, int target)
{
        struct nvram *nv = &ha->nvram;
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        int status, lun;
        uint16_t flag;

        /* Set Target Parameters. */
        mb[0] = MBC_SET_TARGET_PARAMETERS;
        mb[1] = (uint16_t)((bus ? target | BIT_7 : target) << 8);

        /*
         * Do not enable sync and ppr for the initial INQUIRY run. We
         * enable this later if we determine the target actually
         * supports it.
         */
        mb[2] = (TP_RENEGOTIATE | TP_AUTO_REQUEST_SENSE | TP_TAGGED_QUEUE
                 | TP_WIDE | TP_PARITY | TP_DISCONNECT);

        if (IS_ISP1x160(ha))
                mb[3] = nv->bus[bus].target[target].flags.flags1x160.sync_offset << 8;
        else
                mb[3] = nv->bus[bus].target[target].flags.flags1x80.sync_offset << 8;
        mb[3] |= nv->bus[bus].target[target].sync_period;
        status = qla1280_mailbox_command(ha, 0x0f, mb);

        /* Save Tag queuing enable flag. */
        flag = (BIT_0 << target) & mb[0];
        if (nv->bus[bus].target[target].parameter.tag_queuing)
                ha->bus_settings[bus].qtag_enables |= flag;

        /* Save Device enable flag. */
        if (IS_ISP1x160(ha)) {
                if (nv->bus[bus].target[target].flags.flags1x160.device_enable)
                        ha->bus_settings[bus].device_enables |= flag;
                ha->bus_settings[bus].lun_disables |= 0;
        } else {
                if (nv->bus[bus].target[target].flags.flags1x80.device_enable)
                        ha->bus_settings[bus].device_enables |= flag;
                /* Save LUN disable flag. */
                if (nv->bus[bus].target[target].flags.flags1x80.lun_disable)
                        ha->bus_settings[bus].lun_disables |= flag;
        }

        /* Set Device Queue Parameters. */
        for (lun = 0; lun < MAX_LUNS; lun++) {
                mb[0] = MBC_SET_DEVICE_QUEUE;
                mb[1] = (uint16_t)((bus ? target | BIT_7 : target) << 8);
                mb[1] |= lun;
                mb[2] = nv->bus[bus].max_queue_depth;
                mb[3] = nv->bus[bus].target[target].execution_throttle;
                status |= qla1280_mailbox_command(ha, 0x0f, mb);
        }

        return status;
}

static int
qla1280_config_bus(struct scsi_qla_host *ha, int bus)
{
        struct nvram *nv = &ha->nvram;
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        int target, status;

        /* SCSI Reset Disable. */
        ha->bus_settings[bus].disable_scsi_reset =
                nv->bus[bus].config_1.scsi_reset_disable;

        /* Initiator ID. */
        ha->bus_settings[bus].id = nv->bus[bus].config_1.initiator_id;
        mb[0] = MBC_SET_INITIATOR_ID;
        mb[1] = bus ? ha->bus_settings[bus].id | BIT_7 :
                ha->bus_settings[bus].id;
        status = qla1280_mailbox_command(ha, BIT_1 | BIT_0, &mb[0]);

        /* Reset Delay. */
        ha->bus_settings[bus].bus_reset_delay =
                nv->bus[bus].bus_reset_delay;

        /* Command queue depth per device. */
        ha->bus_settings[bus].hiwat = nv->bus[bus].max_queue_depth - 1;

        /* Set target parameters. */
        for (target = 0; target < MAX_TARGETS; target++)
                status |= qla1280_config_target(ha, bus, target);

        return status;
}

static int
qla1280_nvram_config(struct scsi_qla_host *ha)
{
        struct device_reg __iomem *reg = ha->iobase;
        struct nvram *nv = &ha->nvram;
        int bus, target, status = 0;
        uint16_t mb[MAILBOX_REGISTER_COUNT];

        ENTER("qla1280_nvram_config");

        if (ha->nvram_valid) {
                /* Always force AUTO sense for LINUX SCSI */
                for (bus = 0; bus < MAX_BUSES; bus++)
                        for (target = 0; target < MAX_TARGETS; target++) {
                                nv->bus[bus].target[target].parameter.
                                        auto_request_sense = 1;
                        }
        } else {
                qla1280_set_defaults(ha);
        }

        qla1280_print_settings(nv);

        /* Disable RISC load of firmware. */
        ha->flags.disable_risc_code_load =
                nv->cntr_flags_1.disable_loading_risc_code;

        if (IS_ISP1040(ha)) {
                uint16_t hwrev, cfg1, cdma_conf, ddma_conf;

                hwrev = RD_REG_WORD(&reg->cfg_0) & ISP_CFG0_HWMSK;

                cfg1 = RD_REG_WORD(&reg->cfg_1) & ~(BIT_4 | BIT_5 | BIT_6);
                cdma_conf = RD_REG_WORD(&reg->cdma_cfg);
                ddma_conf = RD_REG_WORD(&reg->ddma_cfg);

                /* Busted fifo, says mjacob. */
                if (hwrev != ISP_CFG0_1040A)
                        cfg1 |= nv->isp_config.fifo_threshold << 4;

                cfg1 |= nv->isp_config.burst_enable << 2;
                WRT_REG_WORD(&reg->cfg_1, cfg1);

                WRT_REG_WORD(&reg->cdma_cfg, cdma_conf | CDMA_CONF_BENAB);
                WRT_REG_WORD(&reg->ddma_cfg, cdma_conf | DDMA_CONF_BENAB);
        } else {
                uint16_t cfg1, term;

                /* Set ISP hardware DMA burst */
                cfg1 = nv->isp_config.fifo_threshold << 4;
                cfg1 |= nv->isp_config.burst_enable << 2;
                /* Enable DMA arbitration on dual channel controllers */
                if (ha->ports > 1)
                        cfg1 |= BIT_13;
                WRT_REG_WORD(&reg->cfg_1, cfg1);

                /* Set SCSI termination. */
                WRT_REG_WORD(&reg->gpio_enable,
                             BIT_7 | BIT_3 | BIT_2 | BIT_1 | BIT_0);
                term = nv->termination.scsi_bus_1_control;
                term |= nv->termination.scsi_bus_0_control << 2;
                term |= nv->termination.auto_term_support << 7;
                RD_REG_WORD(&reg->id_l);        /* Flush PCI write */
                WRT_REG_WORD(&reg->gpio_data, term);
        }
        RD_REG_WORD(&reg->id_l);        /* Flush PCI write */

        /* ISP parameter word. */
        mb[0] = MBC_SET_SYSTEM_PARAMETER;
        mb[1] = nv->isp_parameter;
        status |= qla1280_mailbox_command(ha, BIT_1 | BIT_0, &mb[0]);

        if (IS_ISP1x40(ha)) {
                /* clock rate - for qla1240 and older, only */
                mb[0] = MBC_SET_CLOCK_RATE;
                mb[1] = 40;
                status |= qla1280_mailbox_command(ha, BIT_1 | BIT_0, mb);
        }

        /* Firmware feature word. */
        mb[0] = MBC_SET_FIRMWARE_FEATURES;
        mb[1] = nv->firmware_feature.f.enable_fast_posting;
        mb[1] |= nv->firmware_feature.f.report_lvd_bus_transition << 1;
        mb[1] |= nv->firmware_feature.f.disable_synchronous_backoff << 5;
#if defined(CONFIG_IA64_GENERIC) || defined (CONFIG_IA64_SGI_SN2)
        if (ia64_platform_is("sn2")) {
                printk(KERN_INFO "scsi(%li): Enabling SN2 PCI DMA "
                       "workaround\n", ha->host_no);
                mb[1] |= nv->firmware_feature.f.unused_9 << 9; /* XXX */
        }
#endif
        status |= qla1280_mailbox_command(ha, BIT_1 | BIT_0, mb);

        /* Retry count and delay. */
        mb[0] = MBC_SET_RETRY_COUNT;
        mb[1] = nv->bus[0].retry_count;
        mb[2] = nv->bus[0].retry_delay;
        mb[6] = nv->bus[1].retry_count;
        mb[7] = nv->bus[1].retry_delay;
        status |= qla1280_mailbox_command(ha, BIT_7 | BIT_6 | BIT_2 |
                                          BIT_1 | BIT_0, &mb[0]);

        /* ASYNC data setup time. */
        mb[0] = MBC_SET_ASYNC_DATA_SETUP;
        mb[1] = nv->bus[0].config_2.async_data_setup_time;
        mb[2] = nv->bus[1].config_2.async_data_setup_time;
        status |= qla1280_mailbox_command(ha, BIT_2 | BIT_1 | BIT_0, &mb[0]);

        /* Active negation states. */
        mb[0] = MBC_SET_ACTIVE_NEGATION;
        mb[1] = 0;
        if (nv->bus[0].config_2.req_ack_active_negation)
                mb[1] |= BIT_5;
        if (nv->bus[0].config_2.data_line_active_negation)
                mb[1] |= BIT_4;
        mb[2] = 0;
        if (nv->bus[1].config_2.req_ack_active_negation)
                mb[2] |= BIT_5;
        if (nv->bus[1].config_2.data_line_active_negation)
                mb[2] |= BIT_4;
        status |= qla1280_mailbox_command(ha, BIT_2 | BIT_1 | BIT_0, mb);

        mb[0] = MBC_SET_DATA_OVERRUN_RECOVERY;
        mb[1] = 2;      /* Reset SCSI bus and return all outstanding IO */
        status |= qla1280_mailbox_command(ha, BIT_1 | BIT_0, mb);

        /* thingy */
        mb[0] = MBC_SET_PCI_CONTROL;
        mb[1] = BIT_1;  /* Data DMA Channel Burst Enable */
        mb[2] = BIT_1;  /* Command DMA Channel Burst Enable */
        status |= qla1280_mailbox_command(ha, BIT_2 | BIT_1 | BIT_0, mb);

        mb[0] = MBC_SET_TAG_AGE_LIMIT;
        mb[1] = 8;
        status |= qla1280_mailbox_command(ha, BIT_1 | BIT_0, mb);

        /* Selection timeout. */
        mb[0] = MBC_SET_SELECTION_TIMEOUT;
        mb[1] = nv->bus[0].selection_timeout;
        mb[2] = nv->bus[1].selection_timeout;
        status |= qla1280_mailbox_command(ha, BIT_2 | BIT_1 | BIT_0, mb);

        for (bus = 0; bus < ha->ports; bus++)
                status |= qla1280_config_bus(ha, bus);

        if (status)
                dprintk(2, "qla1280_nvram_config: **** FAILED ****\n");

        LEAVE("qla1280_nvram_config");
        return status;
}

/*
 * Get NVRAM data word
 *      Calculates word position in NVRAM and calls request routine to
 *      get the word from NVRAM.
 *
 * Input:
 *      ha      = adapter block pointer.
 *      address = NVRAM word address.
 *
 * Returns:
 *      data word.
 */
static uint16_t
qla1280_get_nvram_word(struct scsi_qla_host *ha, uint32_t address)
{
        uint32_t nv_cmd;
        uint16_t data;

        nv_cmd = address << 16;
        nv_cmd |= NV_READ_OP;

        data = le16_to_cpu(qla1280_nvram_request(ha, nv_cmd));

        dprintk(8, "qla1280_get_nvram_word: exiting normally NVRAM data = "
                "0x%x", data);

        return data;
}

/*
 * NVRAM request
 *      Sends read command to NVRAM and gets data from NVRAM.
 *
 * Input:
 *      ha     = adapter block pointer.
 *      nv_cmd = Bit 26     = start bit
 *               Bit 25, 24 = opcode
 *               Bit 23-16  = address
 *               Bit 15-0   = write data
 *
 * Returns:
 *      data word.
 */
static uint16_t
qla1280_nvram_request(struct scsi_qla_host *ha, uint32_t nv_cmd)
{
        struct device_reg __iomem *reg = ha->iobase;
        int cnt;
        uint16_t data = 0;
        uint16_t reg_data;

        /* Send command to NVRAM. */

        nv_cmd <<= 5;
        for (cnt = 0; cnt < 11; cnt++) {
                if (nv_cmd & BIT_31)
                        qla1280_nv_write(ha, NV_DATA_OUT);
                else
                        qla1280_nv_write(ha, 0);
                nv_cmd <<= 1;
        }

        /* Read data from NVRAM. */

        for (cnt = 0; cnt < 16; cnt++) {
                WRT_REG_WORD(&reg->nvram, (NV_SELECT | NV_CLOCK));
                RD_REG_WORD(&reg->id_l);        /* Flush PCI write */
                NVRAM_DELAY();
                data <<= 1;
                reg_data = RD_REG_WORD(&reg->nvram);
                if (reg_data & NV_DATA_IN)
                        data |= BIT_0;
                WRT_REG_WORD(&reg->nvram, NV_SELECT);
                RD_REG_WORD(&reg->id_l);        /* Flush PCI write */
                NVRAM_DELAY();
        }

        /* Deselect chip. */

        WRT_REG_WORD(&reg->nvram, NV_DESELECT);
        RD_REG_WORD(&reg->id_l);        /* Flush PCI write */
        NVRAM_DELAY();

        return data;
}

static void
qla1280_nv_write(struct scsi_qla_host *ha, uint16_t data)
{
        struct device_reg __iomem *reg = ha->iobase;

        WRT_REG_WORD(&reg->nvram, data | NV_SELECT);
        RD_REG_WORD(&reg->id_l);        /* Flush PCI write */
        NVRAM_DELAY();
        WRT_REG_WORD(&reg->nvram, data | NV_SELECT | NV_CLOCK);
        RD_REG_WORD(&reg->id_l);        /* Flush PCI write */
        NVRAM_DELAY();
        WRT_REG_WORD(&reg->nvram, data | NV_SELECT);
        RD_REG_WORD(&reg->id_l);        /* Flush PCI write */
        NVRAM_DELAY();
}

/*
 * Mailbox Command
 *      Issue mailbox command and waits for completion.
 *
 * Input:
 *      ha = adapter block pointer.
 *      mr = mailbox registers to load.
 *      mb = data pointer for mailbox registers.
 *
 * Output:
 *      mb[MAILBOX_REGISTER_COUNT] = returned mailbox data.
 *
 * Returns:
 *      0 = success
 */
static int
qla1280_mailbox_command(struct scsi_qla_host *ha, uint8_t mr, uint16_t *mb)
{
        struct device_reg __iomem *reg = ha->iobase;
#if 0
        LIST_HEAD(done_q);
#endif
        int status = 0;
        int cnt;
        uint16_t *optr, *iptr;
        uint16_t __iomem *mptr;
        uint16_t data;
        DECLARE_COMPLETION(wait);
        struct timer_list timer;

        ENTER("qla1280_mailbox_command");

        if (ha->mailbox_wait) {
                printk(KERN_ERR "Warning mailbox wait already in use!\n");
        }
        ha->mailbox_wait = &wait;

        /*
         * We really should start out by verifying that the mailbox is
         * available before starting sending the command data
         */
        /* Load mailbox registers. */
        mptr = (uint16_t __iomem *) &reg->mailbox0;
        iptr = mb;
        for (cnt = 0; cnt < MAILBOX_REGISTER_COUNT; cnt++) {
                if (mr & BIT_0) {
                        WRT_REG_WORD(mptr, (*iptr));
                }

                mr >>= 1;
                mptr++;
                iptr++;
        }

        /* Issue set host interrupt command. */

        /* set up a timer just in case we're really jammed */
        init_timer(&timer);
        timer.expires = jiffies + 20*HZ;
        timer.data = (unsigned long)ha;
        timer.function = qla1280_mailbox_timeout;
        add_timer(&timer);

        spin_unlock_irq(ha->host->host_lock);
        WRT_REG_WORD(&reg->host_cmd, HC_SET_HOST_INT);
        data = qla1280_debounce_register(&reg->istatus);

        wait_for_completion(&wait);
        del_timer_sync(&timer);

        spin_lock_irq(ha->host->host_lock);

        ha->mailbox_wait = NULL;

        /* Check for mailbox command timeout. */
        if (ha->mailbox_out[0] != MBS_CMD_CMP) {
                printk(KERN_WARNING "qla1280_mailbox_command: Command failed, "
                       "mailbox0 = 0x%04x, mailbox_out0 = 0x%04x, istatus = "
                       "0x%04x\n", 
                       mb[0], ha->mailbox_out[0], RD_REG_WORD(&reg->istatus));
                printk(KERN_WARNING "m0 %04x, m1 %04x, m2 %04x, m3 %04x\n",
                       RD_REG_WORD(&reg->mailbox0), RD_REG_WORD(&reg->mailbox1),
                       RD_REG_WORD(&reg->mailbox2), RD_REG_WORD(&reg->mailbox3));
                printk(KERN_WARNING "m4 %04x, m5 %04x, m6 %04x, m7 %04x\n",
                       RD_REG_WORD(&reg->mailbox4), RD_REG_WORD(&reg->mailbox5),
                       RD_REG_WORD(&reg->mailbox6), RD_REG_WORD(&reg->mailbox7));
                status = 1;
        }

        /* Load return mailbox registers. */
        optr = mb;
        iptr = (uint16_t *) &ha->mailbox_out[0];
        mr = MAILBOX_REGISTER_COUNT;
        memcpy(optr, iptr, MAILBOX_REGISTER_COUNT * sizeof(uint16_t));

#if 0
        /* Go check for any response interrupts pending. */
        qla1280_isr(ha, &done_q);
#endif

        if (ha->flags.reset_marker)
                qla1280_rst_aen(ha);

#if 0
        if (!list_empty(&done_q))
                qla1280_done(ha, &done_q);
#endif

        if (status)
                dprintk(2, "qla1280_mailbox_command: **** FAILED, mailbox0 = "
                        "0x%x ****\n", mb[0]);

        LEAVE("qla1280_mailbox_command");
        return status;
}

/*
 * qla1280_poll
 *      Polls ISP for interrupts.
 *
 * Input:
 *      ha = adapter block pointer.
 */
static void
qla1280_poll(struct scsi_qla_host *ha)
{
        struct device_reg __iomem *reg = ha->iobase;
        uint16_t data;
        LIST_HEAD(done_q);

        /* ENTER("qla1280_poll"); */

        /* Check for pending interrupts. */
        data = RD_REG_WORD(&reg->istatus);
        if (data & RISC_INT)
                qla1280_isr(ha, &done_q);

        if (!ha->mailbox_wait) {
                if (ha->flags.reset_marker)
                        qla1280_rst_aen(ha);
        }

        if (!list_empty(&done_q))
                qla1280_done(ha);

        /* LEAVE("qla1280_poll"); */
}

/*
 * qla1280_bus_reset
 *      Issue SCSI bus reset.
 *
 * Input:
 *      ha  = adapter block pointer.
 *      bus = SCSI bus number.
 *
 * Returns:
 *      0 = success
 */
static int
qla1280_bus_reset(struct scsi_qla_host *ha, int bus)
{
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        uint16_t reset_delay;
        int status;

        dprintk(3, "qla1280_bus_reset: entered\n");

        if (qla1280_verbose)
                printk(KERN_INFO "scsi(%li:%i): Resetting SCSI BUS\n",
                       ha->host_no, bus);

        reset_delay = ha->bus_settings[bus].bus_reset_delay;
        mb[0] = MBC_BUS_RESET;
        mb[1] = reset_delay;
        mb[2] = (uint16_t) bus;
        status = qla1280_mailbox_command(ha, BIT_2 | BIT_1 | BIT_0, &mb[0]);

        if (status) {
                if (ha->bus_settings[bus].failed_reset_count > 2)
                        ha->bus_settings[bus].scsi_bus_dead = 1;
                ha->bus_settings[bus].failed_reset_count++;
        } else {
                spin_unlock_irq(ha->host->host_lock);
                ssleep(reset_delay);
                spin_lock_irq(ha->host->host_lock);

                ha->bus_settings[bus].scsi_bus_dead = 0;
                ha->bus_settings[bus].failed_reset_count = 0;
                ha->bus_settings[bus].reset_marker = 0;
                /* Issue marker command. */
                qla1280_marker(ha, bus, 0, 0, MK_SYNC_ALL);
        }

        /*
         * We should probably call qla1280_set_target_parameters()
         * here as well for all devices on the bus.
         */

        if (status)
                dprintk(2, "qla1280_bus_reset: **** FAILED ****\n");
        else
                dprintk(3, "qla1280_bus_reset: exiting normally\n");

        return status;
}

/*
 * qla1280_device_reset
 *      Issue bus device reset message to the target.
 *
 * Input:
 *      ha      = adapter block pointer.
 *      bus     = SCSI BUS number.
 *      target  = SCSI ID.
 *
 * Returns:
 *      0 = success
 */
static int
qla1280_device_reset(struct scsi_qla_host *ha, int bus, int target)
{
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        int status;

        ENTER("qla1280_device_reset");

        mb[0] = MBC_ABORT_TARGET;
        mb[1] = (bus ? (target | BIT_7) : target) << 8;
        mb[2] = 1;
        status = qla1280_mailbox_command(ha, BIT_2 | BIT_1 | BIT_0, &mb[0]);

        /* Issue marker command. */
        qla1280_marker(ha, bus, target, 0, MK_SYNC_ID);

        if (status)
                dprintk(2, "qla1280_device_reset: **** FAILED ****\n");

        LEAVE("qla1280_device_reset");
        return status;
}

/*
 * qla1280_abort_device
 *      Issue an abort message to the device
 *
 * Input:
 *      ha     = adapter block pointer.
 *      bus    = SCSI BUS.
 *      target = SCSI ID.
 *      lun    = SCSI LUN.
 *
 * Returns:
 *      0 = success
 */
static int
qla1280_abort_device(struct scsi_qla_host *ha, int bus, int target, int lun)
{
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        int status;

        ENTER("qla1280_abort_device");

        mb[0] = MBC_ABORT_DEVICE;
        mb[1] = (bus ? target | BIT_7 : target) << 8 | lun;
        status = qla1280_mailbox_command(ha, BIT_1 | BIT_0, &mb[0]);

        /* Issue marker command. */
        qla1280_marker(ha, bus, target, lun, MK_SYNC_ID_LUN);

        if (status)
                dprintk(2, "qla1280_abort_device: **** FAILED ****\n");

        LEAVE("qla1280_abort_device");
        return status;
}

/*
 * qla1280_abort_command
 *      Abort command aborts a specified IOCB.
 *
 * Input:
 *      ha = adapter block pointer.
 *      sp = SB structure pointer.
 *
 * Returns:
 *      0 = success
 */
static int
qla1280_abort_command(struct scsi_qla_host *ha, struct srb * sp, int handle)
{
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        unsigned int bus, target, lun;
        int status;

        ENTER("qla1280_abort_command");

        bus = SCSI_BUS_32(sp->cmd);
        target = SCSI_TCN_32(sp->cmd);
        lun = SCSI_LUN_32(sp->cmd);

        sp->flags |= SRB_ABORT_PENDING;

        mb[0] = MBC_ABORT_COMMAND;
        mb[1] = (bus ? target | BIT_7 : target) << 8 | lun;
        mb[2] = handle >> 16;
        mb[3] = handle & 0xffff;
        status = qla1280_mailbox_command(ha, 0x0f, &mb[0]);

        if (status) {
                dprintk(2, "qla1280_abort_command: **** FAILED ****\n");
                sp->flags &= ~SRB_ABORT_PENDING;
        }


        LEAVE("qla1280_abort_command");
        return status;
}

/*
 * qla1280_reset_adapter
 *      Reset adapter.
 *
 * Input:
 *      ha = adapter block pointer.
 */
static void
qla1280_reset_adapter(struct scsi_qla_host *ha)
{
        struct device_reg __iomem *reg = ha->iobase;

        ENTER("qla1280_reset_adapter");

        /* Disable ISP chip */
        ha->flags.online = 0;
        WRT_REG_WORD(&reg->ictrl, ISP_RESET);
        WRT_REG_WORD(&reg->host_cmd,
                     HC_RESET_RISC | HC_RELEASE_RISC | HC_DISABLE_BIOS);
        RD_REG_WORD(&reg->id_l);        /* Flush PCI write */

        LEAVE("qla1280_reset_adapter");
}

/*
 *  Issue marker command.
 *      Function issues marker IOCB.
 *
 * Input:
 *      ha   = adapter block pointer.
 *      bus  = SCSI BUS number
 *      id   = SCSI ID
 *      lun  = SCSI LUN
 *      type = marker modifier
 */
static void
qla1280_marker(struct scsi_qla_host *ha, int bus, int id, int lun, u8 type)
{
        struct mrk_entry *pkt;

        ENTER("qla1280_marker");

        /* Get request packet. */
        if ((pkt = (struct mrk_entry *) qla1280_req_pkt(ha))) {
                pkt->entry_type = MARKER_TYPE;
                pkt->lun = (uint8_t) lun;
                pkt->target = (uint8_t) (bus ? (id | BIT_7) : id);
                pkt->modifier = type;
                pkt->entry_status = 0;

                /* Issue command to ISP */
                qla1280_isp_cmd(ha);
        }

        LEAVE("qla1280_marker");
}


/*
 * qla1280_64bit_start_scsi
 *      The start SCSI is responsible for building request packets on
 *      request ring and modifying ISP input pointer.
 *
 * Input:
 *      ha = adapter block pointer.
 *      sp = SB structure pointer.
 *
 * Returns:
 *      0 = success, was able to issue command.
 */
#ifdef QLA_64BIT_PTR
static int
qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
{
        struct device_reg __iomem *reg = ha->iobase;
        struct scsi_cmnd *cmd = sp->cmd;
        cmd_a64_entry_t *pkt;
        struct scatterlist *sg = NULL;
        __le32 *dword_ptr;
        dma_addr_t dma_handle;
        int status = 0;
        int cnt;
        int req_cnt;
        u16 seg_cnt;
        u8 dir;

        ENTER("qla1280_64bit_start_scsi:");

        /* Calculate number of entries and segments required. */
        req_cnt = 1;
        if (cmd->use_sg) {
                sg = (struct scatterlist *) cmd->request_buffer;
                seg_cnt = pci_map_sg(ha->pdev, sg, cmd->use_sg,
                                     cmd->sc_data_direction);

                if (seg_cnt > 2) {
                        req_cnt += (seg_cnt - 2) / 5;
                        if ((seg_cnt - 2) % 5)
                                req_cnt++;
                }
        } else if (cmd->request_bufflen) {      /* If data transfer. */
                seg_cnt = 1;
        } else {
                seg_cnt = 0;
        }

        if ((req_cnt + 2) >= ha->req_q_cnt) {
                /* Calculate number of free request entries. */
                cnt = RD_REG_WORD(&reg->mailbox4);
                if (ha->req_ring_index < cnt)
                        ha->req_q_cnt = cnt - ha->req_ring_index;
                else
                        ha->req_q_cnt =
                                REQUEST_ENTRY_CNT - (ha->req_ring_index - cnt);
        }

        dprintk(3, "Number of free entries=(%d) seg_cnt=0x%x\n",
                ha->req_q_cnt, seg_cnt);

        /* If room for request in request ring. */
        if ((req_cnt + 2) >= ha->req_q_cnt) {
                status = 1;
                dprintk(2, "qla1280_start_scsi: in-ptr=0x%x  req_q_cnt="
                        "0x%xreq_cnt=0x%x", ha->req_ring_index, ha->req_q_cnt,
                        req_cnt);
                goto out;
        }

        /* Check for room in outstanding command list. */
        for (cnt = 0; cnt < MAX_OUTSTANDING_COMMANDS &&
                     ha->outstanding_cmds[cnt] != 0; cnt++);

        if (cnt >= MAX_OUTSTANDING_COMMANDS) {
                status = 1;
                dprintk(2, "qla1280_start_scsi: NO ROOM IN "
                        "OUTSTANDING ARRAY, req_q_cnt=0x%x", ha->req_q_cnt);
                goto out;
        }

        ha->outstanding_cmds[cnt] = sp;
        ha->req_q_cnt -= req_cnt;
        CMD_HANDLE(sp->cmd) = (unsigned char *)(unsigned long)(cnt + 1);

        dprintk(2, "start: cmd=%p sp=%p CDB=%xm, handle %lx\n", cmd, sp,
                cmd->cmnd[0], (long)CMD_HANDLE(sp->cmd));
        dprintk(2, "             bus %i, target %i, lun %i\n",
                SCSI_BUS_32(cmd), SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
        qla1280_dump_buffer(2, cmd->cmnd, MAX_COMMAND_SIZE);

        /*
         * Build command packet.
         */
        pkt = (cmd_a64_entry_t *) ha->request_ring_ptr;

        pkt->entry_type = COMMAND_A64_TYPE;
        pkt->entry_count = (uint8_t) req_cnt;
        pkt->sys_define = (uint8_t) ha->req_ring_index;
        pkt->entry_status = 0;
        pkt->handle = cpu_to_le32(cnt);

        /* Zero out remaining portion of packet. */
        memset(((char *)pkt + 8), 0, (REQUEST_ENTRY_SIZE - 8));

        /* Set ISP command timeout. */
        pkt->timeout = cpu_to_le16(30);

        /* Set device target ID and LUN */
        pkt->lun = SCSI_LUN_32(cmd);
        pkt->target = SCSI_BUS_32(cmd) ?
                (SCSI_TCN_32(cmd) | BIT_7) : SCSI_TCN_32(cmd);

        /* Enable simple tag queuing if device supports it. */
        if (cmd->device->simple_tags)
                pkt->control_flags |= cpu_to_le16(BIT_3);

        /* Load SCSI command packet. */
        pkt->cdb_len = cpu_to_le16(CMD_CDBLEN(cmd));
        memcpy(pkt->scsi_cdb, &(CMD_CDBP(cmd)), CMD_CDBLEN(cmd));
        /* dprintk(1, "Build packet for command[0]=0x%x\n",pkt->scsi_cdb[0]); */

        /* Set transfer direction. */
        dir = qla1280_data_direction(cmd);
        pkt->control_flags |= cpu_to_le16(dir);

        /* Set total data segment count. */
        pkt->dseg_count = cpu_to_le16(seg_cnt);

        /*
         * Load data segments.
         */
        if (seg_cnt) {  /* If data transfer. */
                /* Setup packet address segment pointer. */
                dword_ptr = (u32 *)&pkt->dseg_0_address;

                if (cmd->use_sg) {      /* If scatter gather */
                        /* Load command entry data segments. */
                        for (cnt = 0; cnt < 2 && seg_cnt; cnt++, seg_cnt--) {
                                dma_handle = sg_dma_address(sg);
#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
                                if (ha->flags.use_pci_vchannel)
                                        sn_pci_set_vchan(ha->pdev,
                                                        (unsigned long *)&dma_handle,
                                                         SCSI_BUS_32(cmd));
#endif
                                *dword_ptr++ =
                                        cpu_to_le32(pci_dma_lo32(dma_handle));
                                *dword_ptr++ =
                                        cpu_to_le32(pci_dma_hi32(dma_handle));
                                *dword_ptr++ = cpu_to_le32(sg_dma_len(sg));
                                sg++;
                                dprintk(3, "S/G Segment phys_addr=%x %x, len=0x%x\n",
                                        cpu_to_le32(pci_dma_hi32(dma_handle)),
                                        cpu_to_le32(pci_dma_lo32(dma_handle)),
                                        cpu_to_le32(sg_dma_len(sg)));
                        }
                        dprintk(5, "qla1280_64bit_start_scsi: Scatter/gather "
                                "command packet data - b %i, t %i, l %i \n",
                                SCSI_BUS_32(cmd), SCSI_TCN_32(cmd),
                                SCSI_LUN_32(cmd));
                        qla1280_dump_buffer(5, (char *)pkt,
                                            REQUEST_ENTRY_SIZE);

                        /*
                         * Build continuation packets.
                         */
                        dprintk(3, "S/G Building Continuation...seg_cnt=0x%x "
                                "remains\n", seg_cnt);

                        while (seg_cnt > 0) {
                                /* Adjust ring index. */
                                ha->req_ring_index++;
                                if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
                                        ha->req_ring_index = 0;
                                        ha->request_ring_ptr =
                                                ha->request_ring;
                                } else
                                                ha->request_ring_ptr++;

                                pkt = (cmd_a64_entry_t *)ha->request_ring_ptr;

                                /* Zero out packet. */
                                memset(pkt, 0, REQUEST_ENTRY_SIZE);

                                /* Load packet defaults. */
                                ((struct cont_a64_entry *) pkt)->entry_type =
                                        CONTINUE_A64_TYPE;
                                ((struct cont_a64_entry *) pkt)->entry_count = 1;
                                ((struct cont_a64_entry *) pkt)->sys_define =
                                        (uint8_t)ha->req_ring_index;
                                /* Setup packet address segment pointer. */
                                dword_ptr =
                                        (u32 *)&((struct cont_a64_entry *) pkt)->dseg_0_address;

                                /* Load continuation entry data segments. */
                                for (cnt = 0; cnt < 5 && seg_cnt;
                                     cnt++, seg_cnt--) {
                                        dma_handle = sg_dma_address(sg);
#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
                                if (ha->flags.use_pci_vchannel)
                                        sn_pci_set_vchan(ha->pdev, 
                                                        (unsigned long *)&dma_handle,
                                                         SCSI_BUS_32(cmd));
#endif
                                        *dword_ptr++ =
                                                cpu_to_le32(pci_dma_lo32(dma_handle));
                                        *dword_ptr++ =
                                                cpu_to_le32(pci_dma_hi32(dma_handle));
                                        *dword_ptr++ =
                                                cpu_to_le32(sg_dma_len(sg));
                                        dprintk(3, "S/G Segment Cont. phys_addr=%x %x, len=0x%x\n",
                                                cpu_to_le32(pci_dma_hi32(dma_handle)),
                                                cpu_to_le32(pci_dma_lo32(dma_handle)),
                                                cpu_to_le32(sg_dma_len(sg)));
                                        sg++;
                                }
                                dprintk(5, "qla1280_64bit_start_scsi: "
                                        "continuation packet data - b %i, t "
                                        "%i, l %i \n", SCSI_BUS_32(cmd),
                                        SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
                                qla1280_dump_buffer(5, (char *)pkt,
                                                    REQUEST_ENTRY_SIZE);
                        }
                } else {        /* No scatter gather data transfer */
                        dma_handle = pci_map_single(ha->pdev,
                                        cmd->request_buffer,
                                        cmd->request_bufflen,
                                        cmd->sc_data_direction);

                        sp->saved_dma_handle = dma_handle;
#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
                        if (ha->flags.use_pci_vchannel)
                                sn_pci_set_vchan(ha->pdev, 
                                                (unsigned long *)&dma_handle,
                                                 SCSI_BUS_32(cmd));
#endif
                        *dword_ptr++ = cpu_to_le32(pci_dma_lo32(dma_handle));
                        *dword_ptr++ = cpu_to_le32(pci_dma_hi32(dma_handle));
                        *dword_ptr = cpu_to_le32(cmd->request_bufflen);

                        dprintk(5, "qla1280_64bit_start_scsi: No scatter/"
                                "gather command packet data - b %i, t %i, "
                                "l %i \n", SCSI_BUS_32(cmd), SCSI_TCN_32(cmd),
                                SCSI_LUN_32(cmd));
                        qla1280_dump_buffer(5, (char *)pkt,
                                            REQUEST_ENTRY_SIZE);
                }
        } else {        /* No data transfer */
                dprintk(5, "qla1280_64bit_start_scsi: No data, command "
                        "packet data - b %i, t %i, l %i \n",
                        SCSI_BUS_32(cmd), SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
                qla1280_dump_buffer(5, (char *)pkt, REQUEST_ENTRY_SIZE);
        }
        /* Adjust ring index. */
        ha->req_ring_index++;
        if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
                ha->req_ring_index = 0;
                ha->request_ring_ptr = ha->request_ring;
        } else
                ha->request_ring_ptr++;

        /* Set chip new ring index. */
        dprintk(2,
                "qla1280_64bit_start_scsi: Wakeup RISC for pending command\n");
        sp->flags |= SRB_SENT;
        ha->actthreads++;
        WRT_REG_WORD(&reg->mailbox4, ha->req_ring_index);
        /* Enforce mmio write ordering; see comment in qla1280_isp_cmd(). */
        mmiowb();

 out:
        if (status)
                dprintk(2, "qla1280_64bit_start_scsi: **** FAILED ****\n");
        else
                dprintk(3, "qla1280_64bit_start_scsi: exiting normally\n");

        return status;
}
#else /* !QLA_64BIT_PTR */

/*
 * qla1280_32bit_start_scsi
 *      The start SCSI is responsible for building request packets on
 *      request ring and modifying ISP input pointer.
 *
 *      The Qlogic firmware interface allows every queue slot to have a SCSI
 *      command and up to 4 scatter/gather (SG) entries.  If we need more
 *      than 4 SG entries, then continuation entries are used that can
 *      hold another 7 entries each.  The start routine determines if there
 *      is eought empty slots then build the combination of requests to
 *      fulfill the OS request.
 *
 * Input:
 *      ha = adapter block pointer.
 *      sp = SCSI Request Block structure pointer.
 *
 * Returns:
 *      0 = success, was able to issue command.
 */
static int
qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
{
        struct device_reg __iomem *reg = ha->iobase;
        struct scsi_cmnd *cmd = sp->cmd;
        struct cmd_entry *pkt;
        struct scatterlist *sg = NULL;
        __le32 *dword_ptr;
        int status = 0;
        int cnt;
        int req_cnt;
        uint16_t seg_cnt;
        dma_addr_t dma_handle;
        u8 dir;

        ENTER("qla1280_32bit_start_scsi");

        dprintk(1, "32bit_start: cmd=%p sp=%p CDB=%x\n", cmd, sp,
                cmd->cmnd[0]);

        /* Calculate number of entries and segments required. */
        req_cnt = 1;
        if (cmd->use_sg) {
                /*
                 * We must build an SG list in adapter format, as the kernel's
                 * SG list cannot be used directly because of data field size
                 * (__alpha__) differences and the kernel SG list uses virtual
                 * addresses where we need physical addresses.
                 */
                sg = (struct scatterlist *) cmd->request_buffer;
                seg_cnt = pci_map_sg(ha->pdev, sg, cmd->use_sg,
                                     cmd->sc_data_direction);

                /*
                 * if greater than four sg entries then we need to allocate
                 * continuation entries
                 */
                if (seg_cnt > 4) {
                        req_cnt += (seg_cnt - 4) / 7;
                        if ((seg_cnt - 4) % 7)
                                req_cnt++;
                }
                dprintk(3, "S/G Transfer cmd=%p seg_cnt=0x%x, req_cnt=%x\n",
                        cmd, seg_cnt, req_cnt);
        } else if (cmd->request_bufflen) {      /* If data transfer. */
                dprintk(3, "No S/G transfer t=%x cmd=%p len=%x CDB=%x\n",
                        SCSI_TCN_32(cmd), cmd, cmd->request_bufflen,
                        cmd->cmnd[0]);
                seg_cnt = 1;
        } else {
                /* dprintk(1, "No data transfer \n"); */
                seg_cnt = 0;
        }

        if ((req_cnt + 2) >= ha->req_q_cnt) {
                /* Calculate number of free request entries. */
                cnt = RD_REG_WORD(&reg->mailbox4);
                if (ha->req_ring_index < cnt)
                        ha->req_q_cnt = cnt - ha->req_ring_index;
                else
                        ha->req_q_cnt =
                                REQUEST_ENTRY_CNT - (ha->req_ring_index - cnt);
        }

        dprintk(3, "Number of free entries=(%d) seg_cnt=0x%x\n",
                ha->req_q_cnt, seg_cnt);
        /* If room for request in request ring. */
        if ((req_cnt + 2) >= ha->req_q_cnt) {
                status = 1;
                dprintk(2, "qla1280_32bit_start_scsi: in-ptr=0x%x, "
                        "req_q_cnt=0x%x, req_cnt=0x%x", ha->req_ring_index,
                        ha->req_q_cnt, req_cnt);
                goto out;
        }

        /* Check for empty slot in outstanding command list. */
        for (cnt = 0; cnt < MAX_OUTSTANDING_COMMANDS &&
                     (ha->outstanding_cmds[cnt] != 0); cnt++) ;

        if (cnt >= MAX_OUTSTANDING_COMMANDS) {
                status = 1;
                dprintk(2, "qla1280_32bit_start_scsi: NO ROOM IN OUTSTANDING "
                        "ARRAY, req_q_cnt=0x%x\n", ha->req_q_cnt);
                goto out;
        }

        CMD_HANDLE(sp->cmd) = (unsigned char *) (unsigned long)(cnt + 1);
        ha->outstanding_cmds[cnt] = sp;
        ha->req_q_cnt -= req_cnt;

        /*
         * Build command packet.
         */
        pkt = (struct cmd_entry *) ha->request_ring_ptr;

        pkt->entry_type = COMMAND_TYPE;
        pkt->entry_count = (uint8_t) req_cnt;
        pkt->sys_define = (uint8_t) ha->req_ring_index;
        pkt->entry_status = 0;
        pkt->handle = cpu_to_le32(cnt);

        /* Zero out remaining portion of packet. */
        memset(((char *)pkt + 8), 0, (REQUEST_ENTRY_SIZE - 8));

        /* Set ISP command timeout. */
        pkt->timeout = cpu_to_le16(30);

        /* Set device target ID and LUN */
        pkt->lun = SCSI_LUN_32(cmd);
        pkt->target = SCSI_BUS_32(cmd) ?
                (SCSI_TCN_32(cmd) | BIT_7) : SCSI_TCN_32(cmd);

        /* Enable simple tag queuing if device supports it. */
        if (cmd->device->simple_tags)
                pkt->control_flags |= cpu_to_le16(BIT_3);

        /* Load SCSI command packet. */
        pkt->cdb_len = cpu_to_le16(CMD_CDBLEN(cmd));
        memcpy(pkt->scsi_cdb, &(CMD_CDBP(cmd)), CMD_CDBLEN(cmd));

        /*dprintk(1, "Build packet for command[0]=0x%x\n",pkt->scsi_cdb[0]); */
        /* Set transfer direction. */
        dir = qla1280_data_direction(cmd);
        pkt->control_flags |= cpu_to_le16(dir);

        /* Set total data segment count. */
        pkt->dseg_count = cpu_to_le16(seg_cnt);

        /*
         * Load data segments.
         */
        if (seg_cnt) {
                /* Setup packet address segment pointer. */
                dword_ptr = &pkt->dseg_0_address;

                if (cmd->use_sg) {      /* If scatter gather */
                        dprintk(3, "Building S/G data segments..\n");
                        qla1280_dump_buffer(1, (char *)sg, 4 * 16);

                        /* Load command entry data segments. */
                        for (cnt = 0; cnt < 4 && seg_cnt; cnt++, seg_cnt--) {
                                *dword_ptr++ =
                                        cpu_to_le32(pci_dma_lo32(sg_dma_address(sg)));
                                *dword_ptr++ =
                                        cpu_to_le32(sg_dma_len(sg));
                                dprintk(3, "S/G Segment phys_addr=0x%lx, len=0x%x\n",
                                        (pci_dma_lo32(sg_dma_address(sg))),
                                        (sg_dma_len(sg)));
                                sg++;
                        }
                        /*
                         * Build continuation packets.
                         */
                        dprintk(3, "S/G Building Continuation"
                                "...seg_cnt=0x%x remains\n", seg_cnt);
                        while (seg_cnt > 0) {
                                /* Adjust ring index. */
                                ha->req_ring_index++;
                                if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
                                        ha->req_ring_index = 0;
                                        ha->request_ring_ptr =
                                                ha->request_ring;
                                } else
                                        ha->request_ring_ptr++;

                                pkt = (struct cmd_entry *)ha->request_ring_ptr;

                                /* Zero out packet. */
                                memset(pkt, 0, REQUEST_ENTRY_SIZE);

                                /* Load packet defaults. */
                                ((struct cont_entry *) pkt)->
                                        entry_type = CONTINUE_TYPE;
                                ((struct cont_entry *) pkt)->entry_count = 1;

                                ((struct cont_entry *) pkt)->sys_define =
                                        (uint8_t) ha->req_ring_index;

                                /* Setup packet address segment pointer. */
                                dword_ptr =
                                        &((struct cont_entry *) pkt)->dseg_0_address;

                                /* Load continuation entry data segments. */
                                for (cnt = 0; cnt < 7 && seg_cnt;
                                     cnt++, seg_cnt--) {
                                        *dword_ptr++ =
                                                cpu_to_le32(pci_dma_lo32(sg_dma_address(sg)));
                                        *dword_ptr++ =
                                                cpu_to_le32(sg_dma_len(sg));
                                        dprintk(1,
                                                "S/G Segment Cont. phys_addr=0x%x, "
                                                "len=0x%x\n",
                                                cpu_to_le32(pci_dma_lo32(sg_dma_address(sg))),
                                                cpu_to_le32(sg_dma_len(sg)));
                                        sg++;
                                }
                                dprintk(5, "qla1280_32bit_start_scsi: "
                                        "continuation packet data - "
                                        "scsi(%i:%i:%i)\n", SCSI_BUS_32(cmd),
                                        SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
                                qla1280_dump_buffer(5, (char *)pkt,
                                                    REQUEST_ENTRY_SIZE);
                        }
                } else {        /* No S/G data transfer */
                        dma_handle = pci_map_single(ha->pdev,
                                        cmd->request_buffer,
                                        cmd->request_bufflen,
                                        cmd->sc_data_direction);
                        sp->saved_dma_handle = dma_handle;

                        *dword_ptr++ = cpu_to_le32(pci_dma_lo32(dma_handle));
                        *dword_ptr = cpu_to_le32(cmd->request_bufflen);
                }
        } else {        /* No data transfer at all */
                dprintk(5, "qla1280_32bit_start_scsi: No data, command "
                        "packet data - \n");
                qla1280_dump_buffer(5, (char *)pkt, REQUEST_ENTRY_SIZE);
        }
        dprintk(5, "qla1280_32bit_start_scsi: First IOCB block:\n");
        qla1280_dump_buffer(5, (char *)ha->request_ring_ptr,
                            REQUEST_ENTRY_SIZE);

        /* Adjust ring index. */
        ha->req_ring_index++;
        if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
                ha->req_ring_index = 0;
                ha->request_ring_ptr = ha->request_ring;
        } else
                ha->request_ring_ptr++;

        /* Set chip new ring index. */
        dprintk(2, "qla1280_32bit_start_scsi: Wakeup RISC "
                "for pending command\n");
        sp->flags |= SRB_SENT;
        ha->actthreads++;
        WRT_REG_WORD(&reg->mailbox4, ha->req_ring_index);
        /* Enforce mmio write ordering; see comment in qla1280_isp_cmd(). */
        mmiowb();

out:
        if (status)
                dprintk(2, "qla1280_32bit_start_scsi: **** FAILED ****\n");

        LEAVE("qla1280_32bit_start_scsi");

        return status;
}
#endif

/*
 * qla1280_req_pkt
 *      Function is responsible for locking ring and
 *      getting a zeroed out request packet.
 *
 * Input:
 *      ha  = adapter block pointer.
 *
 * Returns:
 *      0 = failed to get slot.
 */
static request_t *
qla1280_req_pkt(struct scsi_qla_host *ha)
{
        struct device_reg __iomem *reg = ha->iobase;
        request_t *pkt = NULL;
        int cnt;
        uint32_t timer;

        ENTER("qla1280_req_pkt");

        /*
         * This can be called from interrupt context, damn it!!!
         */
        /* Wait for 30 seconds for slot. */
        for (timer = 15000000; timer; timer--) {
                if (ha->req_q_cnt > 0) {
                        /* Calculate number of free request entries. */
                        cnt = RD_REG_WORD(&reg->mailbox4);
                        if (ha->req_ring_index < cnt)
                                ha->req_q_cnt = cnt - ha->req_ring_index;
                        else
                                ha->req_q_cnt =
                                        REQUEST_ENTRY_CNT - (ha->req_ring_index - cnt);
                }

                /* Found empty request ring slot? */
                if (ha->req_q_cnt > 0) {
                        ha->req_q_cnt--;
                        pkt = ha->request_ring_ptr;

                        /* Zero out packet. */
                        memset(pkt, 0, REQUEST_ENTRY_SIZE);

                        /*
                         * How can this be right when we have a ring
                         * size of 512???
                         */
                        /* Set system defined field. */
                        pkt->sys_define = (uint8_t) ha->req_ring_index;

                        /* Set entry count. */
                        pkt->entry_count = 1;

                        break;
                }

                udelay(2);      /* 10 */

                /* Check for pending interrupts. */
                qla1280_poll(ha);
        }

        if (!pkt)
                dprintk(2, "qla1280_req_pkt: **** FAILED ****\n");
        else
                dprintk(3, "qla1280_req_pkt: exiting normally\n");

        return pkt;
}

/*
 * qla1280_isp_cmd
 *      Function is responsible for modifying ISP input pointer.
 *      Releases ring lock.
 *
 * Input:
 *      ha  = adapter block pointer.
 */
static void
qla1280_isp_cmd(struct scsi_qla_host *ha)
{
        struct device_reg __iomem *reg = ha->iobase;

        ENTER("qla1280_isp_cmd");

        dprintk(5, "qla1280_isp_cmd: IOCB data:\n");
        qla1280_dump_buffer(5, (char *)ha->request_ring_ptr,
                            REQUEST_ENTRY_SIZE);

        /* Adjust ring index. */
        ha->req_ring_index++;
        if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
                ha->req_ring_index = 0;
                ha->request_ring_ptr = ha->request_ring;
        } else
                ha->request_ring_ptr++;

        /*
         * Update request index to mailbox4 (Request Queue In).
         * The mmiowb() ensures that this write is ordered with writes by other
         * CPUs.  Without the mmiowb(), it is possible for the following:
         *    CPUA posts write of index 5 to mailbox4
         *    CPUA releases host lock
         *    CPUB acquires host lock
         *    CPUB posts write of index 6 to mailbox4
         *    On PCI bus, order reverses and write of 6 posts, then index 5,
         *       causing chip to issue full queue of stale commands
         * The mmiowb() prevents future writes from crossing the barrier.
         * See Documentation/DocBook/deviceiobook.tmpl for more information.
         */
        WRT_REG_WORD(&reg->mailbox4, ha->req_ring_index);
        mmiowb();

        LEAVE("qla1280_isp_cmd");
}

/****************************************************************************/
/*                        Interrupt Service Routine.                        */
/****************************************************************************/

/****************************************************************************
 *  qla1280_isr
 *      Calls I/O done on command completion.
 *
 * Input:
 *      ha           = adapter block pointer.
 *      done_q       = done queue.
 ****************************************************************************/
static void
qla1280_isr(struct scsi_qla_host *ha, struct list_head *done_q)
{
        struct device_reg __iomem *reg = ha->iobase;
        struct response *pkt;
        struct srb *sp = NULL;
        uint16_t mailbox[MAILBOX_REGISTER_COUNT];
        uint16_t *wptr;
        uint32_t index;
        u16 istatus;

        ENTER("qla1280_isr");

        istatus = RD_REG_WORD(&reg->istatus);
        if (!(istatus & (RISC_INT | PCI_INT)))
                return;

        /* Save mailbox register 5 */
        mailbox[5] = RD_REG_WORD(&reg->mailbox5);

        /* Check for mailbox interrupt. */

        mailbox[0] = RD_REG_WORD_dmasync(&reg->semaphore);

        if (mailbox[0] & BIT_0) {
                /* Get mailbox data. */
                /* dprintk(1, "qla1280_isr: In Get mailbox data \n"); */

                wptr = &mailbox[0];
                *wptr++ = RD_REG_WORD(&reg->mailbox0);
                *wptr++ = RD_REG_WORD(&reg->mailbox1);
                *wptr = RD_REG_WORD(&reg->mailbox2);
                if (mailbox[0] != MBA_SCSI_COMPLETION) {
                        wptr++;
                        *wptr++ = RD_REG_WORD(&reg->mailbox3);
                        *wptr++ = RD_REG_WORD(&reg->mailbox4);
                        wptr++;
                        *wptr++ = RD_REG_WORD(&reg->mailbox6);
                        *wptr = RD_REG_WORD(&reg->mailbox7);
                }

                /* Release mailbox registers. */

                WRT_REG_WORD(&reg->semaphore, 0);
                WRT_REG_WORD(&reg->host_cmd, HC_CLR_RISC_INT);

                dprintk(5, "qla1280_isr: mailbox interrupt mailbox[0] = 0x%x",
                        mailbox[0]);

                /* Handle asynchronous event */
                switch (mailbox[0]) {
                case MBA_SCSI_COMPLETION:       /* Response completion */
                        dprintk(5, "qla1280_isr: mailbox SCSI response "
                                "completion\n");

                        if (ha->flags.online) {
                                /* Get outstanding command index. */
                                index = mailbox[2] << 16 | mailbox[1];

                                /* Validate handle. */
                                if (index < MAX_OUTSTANDING_COMMANDS)
                                        sp = ha->outstanding_cmds[index];
                                else
                                        sp = NULL;

                                if (sp) {
                                        /* Free outstanding command slot. */
                                        ha->outstanding_cmds[index] = NULL;

                                        /* Save ISP completion status */
                                        CMD_RESULT(sp->cmd) = 0;

                                        /* Place block on done queue */
                                        list_add_tail(&sp->list, done_q);
                                } else {
                                        /*
                                         * If we get here we have a real problem!
                                         */
                                        printk(KERN_WARNING
                                               "qla1280: ISP invalid handle");
                                }
                        }
                        break;

                case MBA_BUS_RESET:     /* SCSI Bus Reset */
                        ha->flags.reset_marker = 1;
                        index = mailbox[6] & BIT_0;
                        ha->bus_settings[index].reset_marker = 1;

                        printk(KERN_DEBUG "qla1280_isr(): index %i "
                               "asynchronous BUS_RESET\n", index);
                        break;

                case MBA_SYSTEM_ERR:    /* System Error */
                        printk(KERN_WARNING
                               "qla1280: ISP System Error - mbx1=%xh, mbx2="
                               "%xh, mbx3=%xh\n", mailbox[1], mailbox[2],
                               mailbox[3]);
                        break;

                case MBA_REQ_TRANSFER_ERR:      /* Request Transfer Error */
                        printk(KERN_WARNING
                               "qla1280: ISP Request Transfer Error\n");
                        break;

                case MBA_RSP_TRANSFER_ERR:      /* Response Transfer Error */
                        printk(KERN_WARNING
                               "qla1280: ISP Response Transfer Error\n");
                        break;

                case MBA_WAKEUP_THRES:  /* Request Queue Wake-up */
                        dprintk(2, "qla1280_isr: asynchronous WAKEUP_THRES\n");
                        break;

                case MBA_TIMEOUT_RESET: /* Execution Timeout Reset */
                        dprintk(2,
                                "qla1280_isr: asynchronous TIMEOUT_RESET\n");
                        break;

                case MBA_DEVICE_RESET:  /* Bus Device Reset */
                        printk(KERN_INFO "qla1280_isr(): asynchronous "
                               "BUS_DEVICE_RESET\n");

                        ha->flags.reset_marker = 1;
                        index = mailbox[6] & BIT_0;
                        ha->bus_settings[index].reset_marker = 1;
                        break;

                case MBA_BUS_MODE_CHANGE:
                        dprintk(2,
                                "qla1280_isr: asynchronous BUS_MODE_CHANGE\n");
                        break;

                default:
                        /* dprintk(1, "qla1280_isr: default case of switch MB \n"); */
                        if (mailbox[0] < MBA_ASYNC_EVENT) {
                                wptr = &mailbox[0];
                                memcpy((uint16_t *) ha->mailbox_out, wptr,
                                       MAILBOX_REGISTER_COUNT *
                                       sizeof(uint16_t));

                                if(ha->mailbox_wait != NULL)
                                        complete(ha->mailbox_wait);
                        }
                        break;
                }
        } else {
                WRT_REG_WORD(&reg->host_cmd, HC_CLR_RISC_INT);
        }

        /*
         * We will receive interrupts during mailbox testing prior to
         * the card being marked online, hence the double check.
         */
        if (!(ha->flags.online && !ha->mailbox_wait)) {
                dprintk(2, "qla1280_isr: Response pointer Error\n");
                goto out;
        }

        if (mailbox[5] >= RESPONSE_ENTRY_CNT)
                goto out;

        while (ha->rsp_ring_index != mailbox[5]) {
                pkt = ha->response_ring_ptr;

                dprintk(5, "qla1280_isr: ha->rsp_ring_index = 0x%x, mailbox[5]"
                        " = 0x%x\n", ha->rsp_ring_index, mailbox[5]);
                dprintk(5,"qla1280_isr: response packet data\n");
                qla1280_dump_buffer(5, (char *)pkt, RESPONSE_ENTRY_SIZE);

                if (pkt->entry_type == STATUS_TYPE) {
                        if ((le16_to_cpu(pkt->scsi_status) & 0xff)
                            || pkt->comp_status || pkt->entry_status) {
                                dprintk(2, "qla1280_isr: ha->rsp_ring_index = "
                                        "0x%x mailbox[5] = 0x%x, comp_status "
                                        "= 0x%x, scsi_status = 0x%x\n",
                                        ha->rsp_ring_index, mailbox[5],
                                        le16_to_cpu(pkt->comp_status),
                                        le16_to_cpu(pkt->scsi_status));
                        }
                } else {
                        dprintk(2, "qla1280_isr: ha->rsp_ring_index = "
                                "0x%x, mailbox[5] = 0x%x\n",
                                ha->rsp_ring_index, mailbox[5]);
                        dprintk(2, "qla1280_isr: response packet data\n");
                        qla1280_dump_buffer(2, (char *)pkt,
                                            RESPONSE_ENTRY_SIZE);
                }

                if (pkt->entry_type == STATUS_TYPE || pkt->entry_status) {
                        dprintk(2, "status: Cmd %p, handle %i\n",
                                ha->outstanding_cmds[pkt->handle]->cmd,
                                pkt->handle);
                        if (pkt->entry_type == STATUS_TYPE)
                                qla1280_status_entry(ha, pkt, done_q);
                        else
                                qla1280_error_entry(ha, pkt, done_q);
                        /* Adjust ring index. */
                        ha->rsp_ring_index++;
                        if (ha->rsp_ring_index == RESPONSE_ENTRY_CNT) {
                                ha->rsp_ring_index = 0;
                                ha->response_ring_ptr = ha->response_ring;
                        } else
                                ha->response_ring_ptr++;
                        WRT_REG_WORD(&reg->mailbox5, ha->rsp_ring_index);
                }
        }
        
 out:
        LEAVE("qla1280_isr");
}

/*
 *  qla1280_rst_aen
 *      Processes asynchronous reset.
 *
 * Input:
 *      ha  = adapter block pointer.
 */
static void
qla1280_rst_aen(struct scsi_qla_host *ha)
{
        uint8_t bus;

        ENTER("qla1280_rst_aen");

        if (ha->flags.online && !ha->flags.reset_active &&
            !ha->flags.abort_isp_active) {
                ha->flags.reset_active = 1;
                while (ha->flags.reset_marker) {
                        /* Issue marker command. */
                        ha->flags.reset_marker = 0;
                        for (bus = 0; bus < ha->ports &&
                                     !ha->flags.reset_marker; bus++) {
                                if (ha->bus_settings[bus].reset_marker) {
                                        ha->bus_settings[bus].reset_marker = 0;
                                        qla1280_marker(ha, bus, 0, 0,
                                                       MK_SYNC_ALL);
                                }
                        }
                }
        }

        LEAVE("qla1280_rst_aen");
}


/*
 *  qla1280_status_entry
 *      Processes received ISP status entry.
 *
 * Input:
 *      ha           = adapter block pointer.
 *      pkt          = entry pointer.
 *      done_q       = done queue.
 */
static void
qla1280_status_entry(struct scsi_qla_host *ha, struct response *pkt,
                     struct list_head *done_q)
{
        unsigned int bus, target, lun;
        int sense_sz;
        struct srb *sp;
        struct scsi_cmnd *cmd;
        uint32_t handle = le32_to_cpu(pkt->handle);
        uint16_t scsi_status = le16_to_cpu(pkt->scsi_status);
        uint16_t comp_status = le16_to_cpu(pkt->comp_status);

        ENTER("qla1280_status_entry");

        /* Validate handle. */
        if (handle < MAX_OUTSTANDING_COMMANDS)
                sp = ha->outstanding_cmds[handle];
        else
                sp = NULL;

        if (!sp) {
                printk(KERN_WARNING "qla1280: Status Entry invalid handle\n");
                goto out;
        }

        /* Free outstanding command slot. */
        ha->outstanding_cmds[handle] = NULL;

        cmd = sp->cmd;

        /* Generate LU queue on cntrl, target, LUN */
        bus = SCSI_BUS_32(cmd);
        target = SCSI_TCN_32(cmd);
        lun = SCSI_LUN_32(cmd);

        if (comp_status || scsi_status) {
                dprintk(3, "scsi: comp_status = 0x%x, scsi_status = "
                        "0x%x, handle = 0x%x\n", comp_status,
                        scsi_status, handle);
        }

        /* Target busy or queue full */
        if ((scsi_status & 0xFF) == SAM_STAT_TASK_SET_FULL ||
            (scsi_status & 0xFF) == SAM_STAT_BUSY) {
                CMD_RESULT(cmd) = scsi_status & 0xff;
        } else {

                /* Save ISP completion status */
                CMD_RESULT(cmd) = qla1280_return_status(pkt, cmd);

                if (scsi_status & SAM_STAT_CHECK_CONDITION) {
                        if (comp_status != CS_ARS_FAILED) {
                                uint16_t req_sense_length =
                                        le16_to_cpu(pkt->req_sense_length);
                                if (req_sense_length < CMD_SNSLEN(cmd))
                                        sense_sz = req_sense_length;
                                else
                                        /*
                                         * scsi_cmnd->sense_buffer is
                                         * 64 bytes, why only copy 63?
                                         * This looks wrong! /Jes
                                         */
                                        sense_sz = CMD_SNSLEN(cmd) - 1;

                                memcpy(cmd->sense_buffer,
                                       &pkt->req_sense_data, sense_sz);
                        } else
                                sense_sz = 0;
                        memset(cmd->sense_buffer + sense_sz, 0,
                               sizeof(cmd->sense_buffer) - sense_sz);

                        dprintk(2, "qla1280_status_entry: Check "
                                "condition Sense data, b %i, t %i, "
                                "l %i\n", bus, target, lun);
                        if (sense_sz)
                                qla1280_dump_buffer(2,
                                                    (char *)cmd->sense_buffer,
                                                    sense_sz);
                }
        }

        /* Place command on done queue. */
        list_add_tail(&sp->list, done_q);
 out:
        LEAVE("qla1280_status_entry");
}

/*
 *  qla1280_error_entry
 *      Processes error entry.
 *
 * Input:
 *      ha           = adapter block pointer.
 *      pkt          = entry pointer.
 *      done_q       = done queue.
 */
static void
qla1280_error_entry(struct scsi_qla_host *ha, struct response *pkt,
                    struct list_head *done_q)
{
        struct srb *sp;
        uint32_t handle = le32_to_cpu(pkt->handle);

        ENTER("qla1280_error_entry");

        if (pkt->entry_status & BIT_3)
                dprintk(2, "qla1280_error_entry: BAD PAYLOAD flag error\n");
        else if (pkt->entry_status & BIT_2)
                dprintk(2, "qla1280_error_entry: BAD HEADER flag error\n");
        else if (pkt->entry_status & BIT_1)
                dprintk(2, "qla1280_error_entry: FULL flag error\n");
        else
                dprintk(2, "qla1280_error_entry: UNKNOWN flag error\n");

        /* Validate handle. */
        if (handle < MAX_OUTSTANDING_COMMANDS)
                sp = ha->outstanding_cmds[handle];
        else
                sp = NULL;

        if (sp) {
                /* Free outstanding command slot. */
                ha->outstanding_cmds[handle] = NULL;

                /* Bad payload or header */
                if (pkt->entry_status & (BIT_3 + BIT_2)) {
                        /* Bad payload or header, set error status. */
                        /* CMD_RESULT(sp->cmd) = CS_BAD_PAYLOAD; */
                        CMD_RESULT(sp->cmd) = DID_ERROR << 16;
                } else if (pkt->entry_status & BIT_1) { /* FULL flag */
                        CMD_RESULT(sp->cmd) = DID_BUS_BUSY << 16;
                } else {
                        /* Set error status. */
                        CMD_RESULT(sp->cmd) = DID_ERROR << 16;
                }

                /* Place command on done queue. */
                list_add_tail(&sp->list, done_q);
        }
#ifdef QLA_64BIT_PTR
        else if (pkt->entry_type == COMMAND_A64_TYPE) {
                printk(KERN_WARNING "!qla1280: Error Entry invalid handle");
        }
#endif

        LEAVE("qla1280_error_entry");
}

/*
 *  qla1280_abort_isp
 *      Resets ISP and aborts all outstanding commands.
 *
 * Input:
 *      ha           = adapter block pointer.
 *
 * Returns:
 *      0 = success
 */
static int
qla1280_abort_isp(struct scsi_qla_host *ha)
{
        struct device_reg __iomem *reg = ha->iobase;
        struct srb *sp;
        int status = 0;
        int cnt;
        int bus;

        ENTER("qla1280_abort_isp");

        if (ha->flags.abort_isp_active || !ha->flags.online)
                goto out;
        
        ha->flags.abort_isp_active = 1;

        /* Disable ISP interrupts. */
        qla1280_disable_intrs(ha);
        WRT_REG_WORD(&reg->host_cmd, HC_PAUSE_RISC);
        RD_REG_WORD(&reg->id_l);

        printk(KERN_INFO "scsi(%li): dequeuing outstanding commands\n",
               ha->host_no);
        /* Dequeue all commands in outstanding command list. */
        for (cnt = 0; cnt < MAX_OUTSTANDING_COMMANDS; cnt++) {
                struct scsi_cmnd *cmd;
                sp = ha->outstanding_cmds[cnt];
                if (sp) {

                        cmd = sp->cmd;
                        CMD_RESULT(cmd) = DID_RESET << 16;

                        sp->cmd = NULL;
                        ha->outstanding_cmds[cnt] = NULL;

                        (*cmd->scsi_done)(cmd);

                        sp->flags = 0;
                }
        }

        status = qla1280_load_firmware(ha);
        if (status)
                goto out;

        /* Setup adapter based on NVRAM parameters. */
        qla1280_nvram_config (ha);

        status = qla1280_init_rings(ha);
        if (status)
                goto out;
                
        /* Issue SCSI reset. */
        for (bus = 0; bus < ha->ports; bus++)
                qla1280_bus_reset(ha, bus);
                
        ha->flags.abort_isp_active = 0;
 out:
        if (status) {
                printk(KERN_WARNING
                       "qla1280: ISP error recovery failed, board disabled");
                qla1280_reset_adapter(ha);
                dprintk(2, "qla1280_abort_isp: **** FAILED ****\n");
        }

        LEAVE("qla1280_abort_isp");
        return status;
}


/*
 * qla1280_debounce_register
 *      Debounce register.
 *
 * Input:
 *      port = register address.
 *
 * Returns:
 *      register value.
 */
static u16
qla1280_debounce_register(volatile u16 __iomem * addr)
{
        volatile u16 ret;
        volatile u16 ret2;

        ret = RD_REG_WORD(addr);
        ret2 = RD_REG_WORD(addr);

        if (ret == ret2)
                return ret;

        do {
                cpu_relax();
                ret = RD_REG_WORD(addr);
                ret2 = RD_REG_WORD(addr);
        } while (ret != ret2);

        return ret;
}


/************************************************************************
 * qla1280_check_for_dead_scsi_bus                                      *
 *                                                                      *
 *    This routine checks for a dead SCSI bus                           *
 ************************************************************************/
#define SET_SXP_BANK            0x0100
#define SCSI_PHASE_INVALID      0x87FF
static int
qla1280_check_for_dead_scsi_bus(struct scsi_qla_host *ha, unsigned int bus)
{
        uint16_t config_reg, scsi_control;
        struct device_reg __iomem *reg = ha->iobase;

        if (ha->bus_settings[bus].scsi_bus_dead) {
                WRT_REG_WORD(&reg->host_cmd, HC_PAUSE_RISC);
                config_reg = RD_REG_WORD(&reg->cfg_1);
                WRT_REG_WORD(&reg->cfg_1, SET_SXP_BANK);
                scsi_control = RD_REG_WORD(&reg->scsiControlPins);
                WRT_REG_WORD(&reg->cfg_1, config_reg);
                WRT_REG_WORD(&reg->host_cmd, HC_RELEASE_RISC);

                if (scsi_control == SCSI_PHASE_INVALID) {
                        ha->bus_settings[bus].scsi_bus_dead = 1;
#if 0
                        CMD_RESULT(cp) = DID_NO_CONNECT << 16;
                        CMD_HANDLE(cp) = INVALID_HANDLE;
                        /* ha->actthreads--; */

                        (*(cp)->scsi_done)(cp);
#endif
                        return 1;       /* bus is dead */
                } else {
                        ha->bus_settings[bus].scsi_bus_dead = 0;
                        ha->bus_settings[bus].failed_reset_count = 0;
                }
        }
        return 0;               /* bus is not dead */
}

static void
qla1280_get_target_parameters(struct scsi_qla_host *ha,
                              struct scsi_device *device)
{
        uint16_t mb[MAILBOX_REGISTER_COUNT];
        int bus, target, lun;

        bus = device->channel;
        target = device->id;
        lun = device->lun;


        mb[0] = MBC_GET_TARGET_PARAMETERS;
        mb[1] = (uint16_t) (bus ? target | BIT_7 : target);
        mb[1] <<= 8;
        qla1280_mailbox_command(ha, BIT_6 | BIT_3 | BIT_2 | BIT_1 | BIT_0,
                                &mb[0]);

        printk(KERN_INFO "scsi(%li:%d:%d:%d):", ha->host_no, bus, target, lun);

        if (mb[3] != 0) {
                printk(" Sync: period %d, offset %d",
                       (mb[3] & 0xff), (mb[3] >> 8));
                if (mb[2] & BIT_13)
                        printk(", Wide");
                if ((mb[2] & BIT_5) && ((mb[6] >> 8) & 0xff) >= 2)
                        printk(", DT");
        } else
                printk(" Async");

        if (device->simple_tags)
                printk(", Tagged queuing: depth %d", device->queue_depth);
        printk("\n");
}


#if DEBUG_QLA1280
static void
__qla1280_dump_buffer(char *b, int size)
{
        int cnt;
        u8 c;

        printk(KERN_DEBUG " 0   1   2   3   4   5   6   7   8   9   Ah  "
               "Bh  Ch  Dh  Eh  Fh\n");
        printk(KERN_DEBUG "---------------------------------------------"
               "------------------\n");

        for (cnt = 0; cnt < size;) {
                c = *b++;

                printk("0x%02x", c);
                cnt++;
                if (!(cnt % 16))
                        printk("\n");
                else
                        printk(" ");
        }
        if (cnt % 16)
                printk("\n");
}

/**************************************************************************
 *   ql1280_print_scsi_cmd
 *
 **************************************************************************/
static void
__qla1280_print_scsi_cmd(struct scsi_cmnd *cmd)
{
        struct scsi_qla_host *ha;
        struct Scsi_Host *host = CMD_HOST(cmd);
        struct srb *sp;
        /* struct scatterlist *sg; */

        int i;
        ha = (struct scsi_qla_host *)host->hostdata;

        sp = (struct srb *)CMD_SP(cmd);
        printk("SCSI Command @= 0x%p, Handle=0x%p\n", cmd, CMD_HANDLE(cmd));
        printk("  chan=%d, target = 0x%02x, lun = 0x%02x, cmd_len = 0x%02x\n",
               SCSI_BUS_32(cmd), SCSI_TCN_32(cmd), SCSI_LUN_32(cmd),
               CMD_CDBLEN(cmd));
        printk(" CDB = ");
        for (i = 0; i < cmd->cmd_len; i++) {
                printk("0x%02x ", cmd->cmnd[i]);
        }
        printk("  seg_cnt =%d\n", cmd->use_sg);
        printk("  request buffer=0x%p, request buffer len=0x%x\n",
               cmd->request_buffer, cmd->request_bufflen);
        /* if (cmd->use_sg)
           {
           sg = (struct scatterlist *) cmd->request_buffer;
           printk("  SG buffer: \n");
           qla1280_dump_buffer(1, (char *)sg, (cmd->use_sg*sizeof(struct scatterlist)));
           } */
        printk("  tag=%d, transfersize=0x%x \n",
               cmd->tag, cmd->transfersize);
        printk("  Pid=%li, SP=0x%p\n", cmd->pid, CMD_SP(cmd));
        printk(" underflow size = 0x%x, direction=0x%x\n",
               cmd->underflow, cmd->sc_data_direction);
}

/**************************************************************************
 *   ql1280_dump_device
 *
 **************************************************************************/
static void
ql1280_dump_device(struct scsi_qla_host *ha)
{

        struct scsi_cmnd *cp;
        struct srb *sp;
        int i;

        printk(KERN_DEBUG "Outstanding Commands on controller:\n");

        for (i = 0; i < MAX_OUTSTANDING_COMMANDS; i++) {
                if ((sp = ha->outstanding_cmds[i]) == NULL)
                        continue;
                if ((cp = sp->cmd) == NULL)
                        continue;
                qla1280_print_scsi_cmd(1, cp);
        }
}
#endif


enum tokens {
        TOKEN_NVRAM,
        TOKEN_SYNC,
        TOKEN_WIDE,
        TOKEN_PPR,
        TOKEN_VERBOSE,
        TOKEN_DEBUG,
};

struct setup_tokens {
        char *token;
        int val;
};

static struct setup_tokens setup_token[] __initdata = 
{
        { "nvram", TOKEN_NVRAM },
        { "sync", TOKEN_SYNC },
        { "wide", TOKEN_WIDE },
        { "ppr", TOKEN_PPR },
        { "verbose", TOKEN_VERBOSE },
        { "debug", TOKEN_DEBUG },
};


/**************************************************************************
 *   qla1280_setup
 *
 *   Handle boot parameters. This really needs to be changed so one
 *   can specify per adapter parameters.
 **************************************************************************/
static int __init
qla1280_setup(char *s)
{
        char *cp, *ptr;
        unsigned long val;
        int toke;

        cp = s;

        while (cp && (ptr = strchr(cp, ':'))) {
                ptr++;
                if (!strcmp(ptr, "yes")) {
                        val = 0x10000;
                        ptr += 3;
                } else if (!strcmp(ptr, "no")) {
                        val = 0;
                        ptr += 2;
                } else
                        val = simple_strtoul(ptr, &ptr, 0);

                switch ((toke = qla1280_get_token(cp))) {
                case TOKEN_NVRAM:
                        if (!val)
                                driver_setup.no_nvram = 1;
                        break;
                case TOKEN_SYNC:
                        if (!val)
                                driver_setup.no_sync = 1;
                        else if (val != 0x10000)
                                driver_setup.sync_mask = val;
                        break;
                case TOKEN_WIDE:
                        if (!val)
                                driver_setup.no_wide = 1;
                        else if (val != 0x10000)
                                driver_setup.wide_mask = val;
                        break;
                case TOKEN_PPR:
                        if (!val)
                                driver_setup.no_ppr = 1;
                        else if (val != 0x10000)
                                driver_setup.ppr_mask = val;
                        break;
                case TOKEN_VERBOSE:
                        qla1280_verbose = val;
                        break;
                default:
                        printk(KERN_INFO "qla1280: unknown boot option %s\n",
                               cp);
                }

                cp = strchr(ptr, ';');
                if (cp)
                        cp++;
                else {
                        break;
                }
        }
        return 1;
}


static int __init
qla1280_get_token(char *str)
{
        char *sep;
        long ret = -1;
        int i;

        sep = strchr(str, ':');

        if (sep) {
                for (i = 0; i < ARRAY_SIZE(setup_token); i++) {
                        if (!strncmp(setup_token[i].token, str, (sep - str))) {
                                ret =  setup_token[i].val;
                                break;
                        }
                }
        }

        return ret;
}


static struct scsi_host_template qla1280_driver_template = {
        .module                 = THIS_MODULE,
        .proc_name              = "qla1280",
        .name                   = "Qlogic ISP 1280/12160",
        .info                   = qla1280_info,
        .slave_configure        = qla1280_slave_configure,
        .queuecommand           = qla1280_queuecommand,
        .eh_abort_handler       = qla1280_eh_abort,
        .eh_device_reset_handler= qla1280_eh_device_reset,
        .eh_bus_reset_handler   = qla1280_eh_bus_reset,
        .eh_host_reset_handler  = qla1280_eh_adapter_reset,
        .bios_param             = qla1280_biosparam,
        .can_queue              = 0xfffff,
        .this_id                = -1,
        .sg_tablesize           = SG_ALL,
        .cmd_per_lun            = 1,
        .use_clustering         = ENABLE_CLUSTERING,
};


static int __devinit
qla1280_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
        int devnum = id->driver_data;
        struct qla_boards *bdp = &ql1280_board_tbl[devnum];
        struct Scsi_Host *host;
        struct scsi_qla_host *ha;
        int error = -ENODEV;

        /* Bypass all AMI SUBSYS VENDOR IDs */
        if (pdev->subsystem_vendor == PCI_VENDOR_ID_AMI) {
                printk(KERN_INFO
                       "qla1280: Skipping AMI SubSys Vendor ID Chip\n");
                goto error;
        }

        printk(KERN_INFO "qla1280: %s found on PCI bus %i, dev %i\n",
               bdp->name, pdev->bus->number, PCI_SLOT(pdev->devfn));
        
        if (pci_enable_device(pdev)) {
                printk(KERN_WARNING
                       "qla1280: Failed to enabled pci device, aborting.\n");
                goto error;
        }

        pci_set_master(pdev);

        error = -ENOMEM;
        host = scsi_host_alloc(&qla1280_driver_template, sizeof(*ha));
        if (!host) {
                printk(KERN_WARNING
                       "qla1280: Failed to register host, aborting.\n");
                goto error_disable_device;
        }

        ha = (struct scsi_qla_host *)host->hostdata;
        memset(ha, 0, sizeof(struct scsi_qla_host));

        ha->pdev = pdev;
        ha->devnum = devnum;    /* specifies microcode load address */

#ifdef QLA_64BIT_PTR
        if (pci_set_dma_mask(ha->pdev, (dma_addr_t) ~ 0ULL)) {
                if (pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK)) {
                        printk(KERN_WARNING "scsi(%li): Unable to set a "
                               "suitable DMA mask - aborting\n", ha->host_no);
                        error = -ENODEV;
                        goto error_free_irq;
                }
        } else
                dprintk(2, "scsi(%li): 64 Bit PCI Addressing Enabled\n",
                        ha->host_no);
#else
        if (pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK)) {
                printk(KERN_WARNING "scsi(%li): Unable to set a "
                       "suitable DMA mask - aborting\n", ha->host_no);
                error = -ENODEV;
                goto error_free_irq;
        }
#endif

        ha->request_ring = pci_alloc_consistent(ha->pdev,
                        ((REQUEST_ENTRY_CNT + 1) * sizeof(request_t)),
                        &ha->request_dma);
        if (!ha->request_ring) {
                printk(KERN_INFO "qla1280: Failed to get request memory\n");
                goto error_put_host;
        }

        ha->response_ring = pci_alloc_consistent(ha->pdev,
                        ((RESPONSE_ENTRY_CNT + 1) * sizeof(struct response)),
                        &ha->response_dma);
        if (!ha->response_ring) {
                printk(KERN_INFO "qla1280: Failed to get response memory\n");
                goto error_free_request_ring;
        }

        ha->ports = bdp->numPorts;

        ha->host = host;
        ha->host_no = host->host_no;

        host->irq = pdev->irq;
        host->max_channel = bdp->numPorts - 1;
        host->max_lun = MAX_LUNS - 1;
        host->max_id = MAX_TARGETS;
        host->max_sectors = 1024;
        host->unique_id = host->host_no;

        error = -ENODEV;

#if MEMORY_MAPPED_IO
        ha->mmpbase = ioremap(pci_resource_start(ha->pdev, 1),
                              pci_resource_len(ha->pdev, 1));
        if (!ha->mmpbase) {
                printk(KERN_INFO "qla1280: Unable to map I/O memory\n");
                goto error_free_response_ring;
        }

        host->base = (unsigned long)ha->mmpbase;
        ha->iobase = (struct device_reg __iomem *)ha->mmpbase;
#else
        host->io_port = pci_resource_start(ha->pdev, 0);
        if (!request_region(host->io_port, 0xff, "qla1280")) {
                printk(KERN_INFO "qla1280: Failed to reserve i/o region "
                                 "0x%04lx-0x%04lx - already in use\n",
                       host->io_port, host->io_port + 0xff);
                goto error_free_response_ring;
        }

        ha->iobase = (struct device_reg *)host->io_port;
#endif

        INIT_LIST_HEAD(&ha->done_q);

        /* Disable ISP interrupts. */
        qla1280_disable_intrs(ha);

        if (request_irq(pdev->irq, qla1280_intr_handler, IRQF_SHARED,
                                "qla1280", ha)) {
                printk("qla1280 : Failed to reserve interrupt %d already "
                       "in use\n", pdev->irq);
                goto error_release_region;
        }

        /* load the F/W, read paramaters, and init the H/W */
        if (qla1280_initialize_adapter(ha)) {
                printk(KERN_INFO "qla1x160: Failed to initialize adapter\n");
                goto error_free_irq;
        }

        /* set our host ID  (need to do something about our two IDs) */
        host->this_id = ha->bus_settings[0].id;

        pci_set_drvdata(pdev, host);

        error = scsi_add_host(host, &pdev->dev);
        if (error)
                goto error_disable_adapter;
        scsi_scan_host(host);

        return 0;

 error_disable_adapter:
        qla1280_disable_intrs(ha);
 error_free_irq:
        free_irq(pdev->irq, ha);
 error_release_region:
#if MEMORY_MAPPED_IO
        iounmap(ha->mmpbase);
#else
        release_region(host->io_port, 0xff);
#endif
 error_free_response_ring:
        pci_free_consistent(ha->pdev,
                        ((RESPONSE_ENTRY_CNT + 1) * sizeof(struct response)),
                        ha->response_ring, ha->response_dma);
 error_free_request_ring:
        pci_free_consistent(ha->pdev,
                        ((REQUEST_ENTRY_CNT + 1) * sizeof(request_t)),
                        ha->request_ring, ha->request_dma);
 error_put_host:
        scsi_host_put(host);
 error_disable_device:
        pci_disable_device(pdev);
 error:
        return error;
}


static void __devexit
qla1280_remove_one(struct pci_dev *pdev)
{
        struct Scsi_Host *host = pci_get_drvdata(pdev);
        struct scsi_qla_host *ha = (struct scsi_qla_host *)host->hostdata;

        scsi_remove_host(host);

        qla1280_disable_intrs(ha);

        free_irq(pdev->irq, ha);

#if MEMORY_MAPPED_IO
        iounmap(ha->mmpbase);
#else
        release_region(host->io_port, 0xff);
#endif

        pci_free_consistent(ha->pdev,
                        ((REQUEST_ENTRY_CNT + 1) * (sizeof(request_t))),
                        ha->request_ring, ha->request_dma);
        pci_free_consistent(ha->pdev,
                        ((RESPONSE_ENTRY_CNT + 1) * (sizeof(struct response))),
                        ha->response_ring, ha->response_dma);

        pci_disable_device(pdev);

        scsi_host_put(host);
}

static struct pci_driver qla1280_pci_driver = {
        .name           = "qla1280",
        .id_table       = qla1280_pci_tbl,
        .probe          = qla1280_probe_one,
        .remove         = __devexit_p(qla1280_remove_one),
};

static int __init
qla1280_init(void)
{
        if (sizeof(struct srb) > sizeof(struct scsi_pointer)) {
                printk(KERN_WARNING
                       "qla1280: struct srb too big, aborting\n");
                return -EINVAL;
        }

#ifdef MODULE
        /*
         * If we are called as a module, the qla1280 pointer may not be null
         * and it would point to our bootup string, just like on the lilo
         * command line.  IF not NULL, then process this config string with
         * qla1280_setup
         *
         * Boot time Options
         * To add options at boot time add a line to your lilo.conf file like:
         * append="qla1280=verbose,max_tags:{{255,255,255,255},{255,255,255,255}}"
         * which will result in the first four devices on the first two
         * controllers being set to a tagged queue depth of 32.
         */
        if (qla1280)
                qla1280_setup(qla1280);
#endif

        return pci_module_init(&qla1280_pci_driver);
}

static void __exit
qla1280_exit(void)
{
        pci_unregister_driver(&qla1280_pci_driver);
}

module_init(qla1280_init);
module_exit(qla1280_exit);


MODULE_AUTHOR("Qlogic & Jes Sorensen");
MODULE_DESCRIPTION("Qlogic ISP SCSI (qla1x80/qla1x160) driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(QLA1280_VERSION);

/*
 * Overrides for Emacs so that we almost follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * tab-width: 8
 * End:
 */