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tmscsim.c

/************************************************************************
 *    FILE NAME : TMSCSIM.C                                 *
 *         BY   : C.L. Huang,  ching@tekram.com.tw                *
 *    Description: Device Driver for Tekram DC-390(T) PCI SCSI    *
 *               Bus Master Host Adapter                    *
 * (C)Copyright 1995-1996 Tekram Technology Co., Ltd.             *
 ************************************************************************
 * (C) Copyright: put under GNU GPL in 10/96                      *
 *                      (see Documentation/scsi/tmscsim.txt)      *
 ************************************************************************
 * $Id: tmscsim.c,v 2.60.2.30 2000/12/20 01:07:12 garloff Exp $         *
 *    Enhancements and bugfixes by                          *
 *    Kurt Garloff <kurt@garloff.de>      <garloff@suse.de>       *
 ************************************************************************
 *    HISTORY:                                        *
 *                                                    *
 *    REV#  DATE  NAME  DESCRIPTION                   *
 *    1.00  96/04/24    CLH   First release                       *
 *    1.01  96/06/12    CLH   Fixed bug of Media Change for Removable *
 *                      Device, scan all LUN. Support Pre2.0.10 *
 *    1.02  96/06/18    CLH   Fixed bug of Command timeout ...    *
 *    1.03  96/09/25    KG    Added tmscsim_proc_info()           *
 *    1.04  96/10/11    CLH   Updating for support KV 2.0.x       *
 *    1.05  96/10/18    KG    Fixed bug in DC390_abort(null ptr deref)*
 *    1.06  96/10/25    KG    Fixed module support                *
 *    1.07  96/11/09    KG    Fixed tmscsim_proc_info()           *
 *    1.08  96/11/18    KG    Fixed null ptr in DC390_Disconnect()      *
 *    1.09  96/11/30    KG    Added register the allocated IO space     *
 *    1.10  96/12/05    CLH   Modified tmscsim_proc_info(), and reset *
 *                      pending interrupt in DC390_detect() *
 *    1.11  97/02/05    KG/CLH      Fixeds problem with partitions greater    *
 *                      than 1GB                      *
 *    1.12  98/02/15  MJ      Rewritten PCI probing               *
 *    1.13  98/04/08    KG    Support for non DC390, __initfunc decls,*
 *                      changed max devs from 10 to 16            *
 *    1.14a 98/05/05    KG    Dynamic DCB allocation, add-single-dev    *
 *                      for LUNs if LUN_SCAN (BIOS) not set *
 *                      runtime config using /proc interface      *
 *    1.14b 98/05/06    KG    eliminated cli (); sti (); spinlocks      *
 *    1.14c 98/05/07    KG    2.0.x compatibility                 *
 *    1.20a 98/05/07    KG    changed names of funcs to be consistent *
 *                      DC390_ (entry points), dc390_ (internal)*
 *                      reworked locking              *
 *    1.20b 98/05/12    KG    bugs: version, kfree, _ctmp         *
 *                      debug output                        *
 *    1.20c 98/05/12    KG    bugs: kfree, parsing, EEpromDefaults      *
 *    1.20d 98/05/14    KG    bugs: list linkage, clear flag after      *
 *                      reset on startup, code cleanup            *
 *    1.20e 98/05/15    KG    spinlock comments, name space cleanup     *
 *                      pLastDCB now part of ACB structure  *
 *                      added stats, timeout for 2.1, TagQ bug    *
 *                      RESET and INQUIRY interface commands      *
 *    1.20f 98/05/18    KG    spinlocks fixes, max_lun fix, free DCBs   *
 *                      for missing LUNs, pending int       *
 *    1.20g 98/05/19    KG    Clean up: Avoid short               *
 *    1.20h 98/05/21    KG    Remove AdaptSCSIID, max_lun ...           *
 *    1.20i 98/05/21    KG    Aiiie: Bug with TagQMask                  *
 *    1.20j 98/05/24    KG    Handle STAT_BUSY, handle pACB->pLinkDCB   *
 *                      == 0 in remove_dev and DoingSRB_Done      *
 *    1.20k 98/05/25    KG    DMA_INT     (experimental)                      *
 *    1.20l 98/05/27    KG    remove DMA_INT; DMA_IDLE cmds added;      *
 *    1.20m 98/06/10    KG    glitch configurable; made some global     *
 *                      vars part of ACB; use DC390_readX   *
 *    1.20n 98/06/11    KG    startup params                      *
 *    1.20o 98/06/15    KG    added TagMaxNum to boot/module params     *
 *                      Device Nr -> Idx, TagMaxNum power of 2  *
 *    1.20p 98/06/17    KG    Docu updates. Reset depends on settings *
 *                      pci_set_master added; 2.0.xx: pcibios_*   *
 *                      used instead of MechNum things ...  *
 *    1.20q 98/06/23    KG    Changed defaults. Added debug code for    *
 *                      removable media and fixed it. TagMaxNum   *
 *                      fixed for DC390. Locking: ACB, DRV for    *
 *                      better IRQ sharing. Spelling: Queueing    *
 *                      Parsing and glitch_cfg changes. Display   *
 *                      real SyncSpeed value. Made DisConn  *
 *                      functional (!)                      *
 *    1.20r 98/06/30    KG    Debug macros, allow disabling DsCn, set   *
 *                      BIT4 in CtrlR4, EN_PAGE_INT, 2.0 module   *
 *                      param -1 fixed.                     *
 *    1.20s 98/08/20    KG    Debug info on abort(), try to check PCI,*
 *                      phys_to_bus instead of phys_to_virt,      *
 *                      fixed sel. process, fixed locking,  *
 *                      added MODULE_XXX infos, changed IRQ *
 *                      request flags, disable DMA_INT            *
 *    1.20t 98/09/07    KG    TagQ report fixed; Write Erase DMA Stat;*
 *                      initfunc -> __init; better abort;   *
 *                      Timeout for XFER_DONE & BLAST_COMPLETE;   *
 *                      Allow up to 33 commands being processed *
 *    2.0a  98/10/14    KG    Max Cmnds back to 17. DMA_Stat clearing *
 *                      all flags. Clear within while() loops     *
 *                      in DataIn_0/Out_0. Null ptr in dumpinfo   *
 *                      for pSRB==0. Better locking during init.*
 *                      bios_param() now respects part. table.    *
 *    2.0b  98/10/24    KG    Docu fixes. Timeout Msg in DMA Blast.     *
 *                      Disallow illegal idx in INQUIRY/REMOVE    *
 *    2.0c  98/11/19    KG    Cleaned up detect/init for SMP boxes,     *
 *                      Write Erase DMA (1.20t) caused problems   *
 *    2.0d  98/12/25    KG    Christmas release ;-) Message handling  *
 *                      completely reworked. Handle target ini-   *
 *                      tiated SDTR correctly.              *
 *    2.0d1 99/01/25    KG    Try to handle RESTORE_PTR           *
 *    2.0d2 99/02/08    KG    Check for failure of kmalloc, correct     *
 *                      inclusion of scsicam.h, DelayReset  *
 *    2.0d3 99/05/31    KG    DRIVER_OK -> DID_OK, DID_NO_CONNECT,      *
 *                      detect Target mode and warn.        *
 *                      pcmd->result handling cleaned up.   *
 *    2.0d4 99/06/01    KG    Cleaned selection process. Found bug      *
 *                      which prevented more than 16 tags. Now:   *
 *                      24. SDTR cleanup. Cleaner multi-LUN *
 *                      handling. Don't modify ControlRegs/FIFO   *
 *                      when connected.                     *
 *    2.0d5 99/06/01    KG    Clear DevID, Fix INQUIRY after cfg chg.   *
 *    2.0d6 99/06/02    KG    Added ADD special command to allow cfg.   *
 *                      before detection. Reset SYNC_NEGO_DONE    *
 *                      after a bus reset.                  *
 *    2.0d7 99/06/03    KG    Fixed bugs wrt add,remove commands  *
 *    2.0d8 99/06/04    KG    Removed copying of cmnd into CmdBlock.    *
 *                      Fixed Oops in _release().           *
 *    2.0d9 99/06/06    KG    Also tag queue INQUIRY, T_U_R, ...  *
 *                      Allow arb. no. of Tagged Cmnds. Max 32    *
 *    2.0d1099/06/20    KG    TagMaxNo changes now honoured! Queueing *
 *                      clearified (renamed ..) TagMask handling*
 *                      cleaned.                      *
 *    2.0d1199/06/28    KG    cmd->result now identical to 2.0d2  *
 *    2.0d1299/07/04    KG    Changed order of processing in IRQ  *
 *    2.0d1399/07/05    KG    Don't update DCB fields if removed  *
 *    2.0d1499/07/05    KG    remove_dev: Move kfree() to the end *
 *    2.0d1599/07/12    KG    use_new_eh_code: 0, ULONG -> UINT where   *
 *                      appropriate                   *
 *    2.0d1699/07/13    KG    Reenable StartSCSI interrupt, Retry msg   *
 *    2.0d1799/07/15    KG    Remove debug msg. Disable recfg. when     *
 *                      there are queued cmnds              *
 *    2.0d1899/07/18    KG    Selection timeout: Don't requeue    *
 *    2.0d1999/07/18    KG    Abort: Only call scsi_done if dequeued    *
 *    2.0d2099/07/19    KG    Rst_Detect: DoingSRB_Done           *
 *    2.0d2199/08/15    KG    dev_id for request/free_irq, cmnd[0] for*
 *                      RETRY, SRBdone does DID_ABORT for the     *
 *                      cmd passed by DC390_reset()         *
 *    2.0d2299/08/25    KG    dev_id fixed. can_queue: 42         *
 *    2.0d2399/08/25    KG    Removed some debugging code. dev_id       *
 *                      now is set to pACB. Use u8,u16,u32.       *
 *    2.0d2499/11/14    KG    Unreg. I/O if failed IRQ alloc. Call      *
 *                      done () w/ DID_BAD_TARGET in case of      *
 *                      missing DCB. We   are old EH!!            *
 *    2.0d2500/01/15    KG    2.3.3x compat from Andreas Schultz  *
 *                      set unique_id. Disable RETRY message.     *
 *    2.0d2600/01/29    KG    Go to new EH.                       *
 *    2.0d2700/01/31    KG    ... but maintain 2.0 compat.        *
 *                      and fix DCB freeing                 *
 *    2.0d2800/02/14    KG    Queue statistics fixed, dump special cmd*
 *                      Waiting_Timer for failed StartSCSI  *
 *                      New EH: Don't return cmnds to ML on RST *
 *                      Use old EH (don't have new EH fns yet)    *
 *                      Reset: Unlock, but refuse to queue  *
 *                      2.3 __setup function                *
 *    2.0e  00/05/22    KG    Return residual for 2.3             *
 *    2.0e1 00/05/25    KG    Compile fixes for 2.3.99            *
 *    2.0e2 00/05/27    KG    Jeff Garzik's pci_enable_device()   *
 *    2.0e3 00/09/29    KG    Some 2.4 changes. Don't try Sync Nego     *
 *                      before INQUIRY has reported ability.      *
 *                      Recognise INQUIRY as scanning command.    *
 *    2.0e4 00/10/13    KG    Allow compilation into 2.4 kernel   *
 *    2.0e5 00/11/17    KG    Store Inq.flags in DCB              *
 *    2.0e6 00/11/22  KG      2.4 init function (Thx to O.Schumann)     *
 *                      2.4 PCI device table (Thx to A.Richter)   *
 *    2.0e7 00/11/28    KG    Allow overriding of BIOS settings   *
 *    2.0f  00/12/20    KG    Handle failed INQUIRYs during scan  *
 *    2.1a  03/11/29  GL, KG  Initial fixing for 2.6. Convert to  *
 *                      use the current PCI-mapping API, update   *
 *                      command-queuing.              *
 *    2.1b  04/04/13  GL      Fix for 64-bit platforms            *
 *    2.1b1 04/01/31    GL    (applied 05.04) Remove internal           *
 *                      command-queuing.              *
 *    2.1b2 04/02/01    CH    (applied 05.04) Fix error-handling  *
 *    2.1c  04/05/23  GL      Update to use the new pci_driver API,     *
 *                      some scsi EH updates, more cleanup. *
 *    2.1d  04/05/27    GL    Moved setting of scan_devices to    *
 *                      slave_alloc/_configure/_destroy, as *
 *                      suggested by CH.              *
 ***********************************************************************/

/* DEBUG options */
//#define DC390_DEBUG0
//#define DC390_DEBUG1
//#define DC390_DCBDEBUG
//#define DC390_PARSEDEBUG
//#define DC390_REMOVABLEDEBUG
//#define DC390_LOCKDEBUG

//#define NOP do{}while(0)
#define C_NOP

/* Debug definitions */
#ifdef DC390_DEBUG0
# define DEBUG0(x) x
#else
# define DEBUG0(x) C_NOP
#endif
#ifdef DC390_DEBUG1
# define DEBUG1(x) x
#else
# define DEBUG1(x) C_NOP
#endif
#ifdef DC390_DCBDEBUG
# define DCBDEBUG(x) x
#else
# define DCBDEBUG(x) C_NOP
#endif
#ifdef DC390_PARSEDEBUG
# define PARSEDEBUG(x) x
#else
# define PARSEDEBUG(x) C_NOP
#endif
#ifdef DC390_REMOVABLEDEBUG
# define REMOVABLEDEBUG(x) x
#else
# define REMOVABLEDEBUG(x) C_NOP
#endif
#define DCBDEBUG1(x) C_NOP

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/io.h>

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


#define DC390_BANNER "Tekram DC390/AM53C974"
#define DC390_VERSION "2.1d 2004-05-27"

#define PCI_DEVICE_ID_AMD53C974     PCI_DEVICE_ID_AMD_SCSI

#include "tmscsim.h"


static void dc390_DataOut_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_DataIn_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_Command_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_Status_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_MsgOut_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_MsgIn_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_DataOutPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_DataInPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_CommandPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_StatusPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_MsgOutPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_MsgInPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_Nop_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);
static void dc390_Nop_1( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus);

static void dc390_SetXferRate( struct dc390_acb* pACB, struct dc390_dcb* pDCB );
static void dc390_Disconnect( struct dc390_acb* pACB );
static void dc390_Reselect( struct dc390_acb* pACB );
static void dc390_SRBdone( struct dc390_acb* pACB, struct dc390_dcb* pDCB, struct dc390_srb* pSRB );
static void dc390_ScsiRstDetect( struct dc390_acb* pACB );
static void dc390_EnableMsgOut_Abort(struct dc390_acb*, struct dc390_srb*);
static void dc390_dumpinfo(struct dc390_acb* pACB, struct dc390_dcb* pDCB, struct dc390_srb* pSRB);
static void dc390_ResetDevParam(struct dc390_acb* pACB);

static u32  dc390_laststatus = 0;
static u8   dc390_adapterCnt = 0;

/* Startup values, to be overriden on the commandline */
static int tmscsim[] = {-2, -2, -2, -2, -2, -2};

module_param_array(tmscsim, int, NULL, 0);
MODULE_PARM_DESC(tmscsim, "Host SCSI ID, Speed (0=10MHz), Device Flags, Adapter Flags, Max Tags (log2(tags)-1), DelayReset (s)");
MODULE_AUTHOR("C.L. Huang / Kurt Garloff");
MODULE_DESCRIPTION("SCSI host adapter driver for Tekram DC390 and other AMD53C974A based PCI SCSI adapters");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("sd,sr,sg,st");

static void *dc390_phase0[]={
       dc390_DataOut_0,
       dc390_DataIn_0,
       dc390_Command_0,
       dc390_Status_0,
       dc390_Nop_0,
       dc390_Nop_0,
       dc390_MsgOut_0,
       dc390_MsgIn_0,
       dc390_Nop_1
       };

static void *dc390_phase1[]={
       dc390_DataOutPhase,
       dc390_DataInPhase,
       dc390_CommandPhase,
       dc390_StatusPhase,
       dc390_Nop_0,
       dc390_Nop_0,
       dc390_MsgOutPhase,
       dc390_MsgInPhase,
       dc390_Nop_1
       };

#ifdef DC390_DEBUG1
static char* dc390_p0_str[] = {
       "dc390_DataOut_0",
       "dc390_DataIn_0",
       "dc390_Command_0",
       "dc390_Status_0",
       "dc390_Nop_0",
       "dc390_Nop_0",
       "dc390_MsgOut_0",
       "dc390_MsgIn_0",
       "dc390_Nop_1"
       };
     
static char* dc390_p1_str[] = {
       "dc390_DataOutPhase",
       "dc390_DataInPhase",
       "dc390_CommandPhase",
       "dc390_StatusPhase",
       "dc390_Nop_0",
       "dc390_Nop_0",
       "dc390_MsgOutPhase",
       "dc390_MsgInPhase",
       "dc390_Nop_1"
       };
#endif   

static u8  dc390_eepromBuf[MAX_ADAPTER_NUM][EE_LEN];
static u8  dc390_clock_period1[] = {4, 5, 6, 7, 8, 10, 13, 20};
static u8  dc390_clock_speed[] = {100,80,67,57,50, 40, 31, 20};

/***********************************************************************
 * Functions for the management of the internal structures 
 * (DCBs, SRBs, Queueing)
 *
 **********************************************************************/
static struct dc390_dcb __inline__ *dc390_findDCB ( struct dc390_acb* pACB, u8 id, u8 lun)
{
   struct dc390_dcb* pDCB = pACB->pLinkDCB; if (!pDCB) return NULL;
   while (pDCB->TargetID != id || pDCB->TargetLUN != lun)
     {
      pDCB = pDCB->pNextDCB;
      if (pDCB == pACB->pLinkDCB)
           return NULL;
     }
   DCBDEBUG1( printk (KERN_DEBUG "DCB %p (%02x,%02x) found.\n",   \
                  pDCB, pDCB->TargetID, pDCB->TargetLUN));
   return pDCB;
}

/* Insert SRB oin top of free list */
static __inline__ void dc390_Free_insert (struct dc390_acb* pACB, struct dc390_srb* pSRB)
{
    DEBUG0(printk ("DC390: Free SRB %p\n", pSRB));
    pSRB->pNextSRB = pACB->pFreeSRB;
    pACB->pFreeSRB = pSRB;
}

static __inline__ void dc390_Going_append (struct dc390_dcb* pDCB, struct dc390_srb* pSRB)
{
    pDCB->GoingSRBCnt++;
    DEBUG0(printk("DC390: Append SRB %p to Going\n", pSRB));
    /* Append to the list of Going commands */
    if( pDCB->pGoingSRB )
      pDCB->pGoingLast->pNextSRB = pSRB;
    else
      pDCB->pGoingSRB = pSRB;

    pDCB->pGoingLast = pSRB;
    /* No next one in sent list */
    pSRB->pNextSRB = NULL;
}

static __inline__ void dc390_Going_remove (struct dc390_dcb* pDCB, struct dc390_srb* pSRB)
{
      DEBUG0(printk("DC390: Remove SRB %p from Going\n", pSRB));
   if (pSRB == pDCB->pGoingSRB)
      pDCB->pGoingSRB = pSRB->pNextSRB;
   else
     {
      struct dc390_srb* psrb = pDCB->pGoingSRB;
      while (psrb && psrb->pNextSRB != pSRB)
        psrb = psrb->pNextSRB;
      if (!psrb) 
        { printk (KERN_ERR "DC390: Remove non-ex. SRB %p from Going!\n", pSRB); return; }
      psrb->pNextSRB = pSRB->pNextSRB;
      if (pSRB == pDCB->pGoingLast)
        pDCB->pGoingLast = psrb;
     }
   pDCB->GoingSRBCnt--;
}

static struct scatterlist* dc390_sg_build_single(struct scatterlist *sg, void *addr, unsigned int length)
{
      memset(sg, 0, sizeof(struct scatterlist));
      sg->page    = virt_to_page(addr);
      sg->length  = length;
      sg->offset  = (unsigned long)addr & ~PAGE_MASK;
      return sg;
}

/* Create pci mapping */
static int dc390_pci_map (struct dc390_srb* pSRB)
{
      int error = 0;
      struct scsi_cmnd *pcmd = pSRB->pcmd;
      struct pci_dev *pdev = pSRB->pSRBDCB->pDCBACB->pdev;
      dc390_cmd_scp_t* cmdp = ((dc390_cmd_scp_t*)(&pcmd->SCp));

      /* Map sense buffer */
      if (pSRB->SRBFlag & AUTO_REQSENSE) {
            pSRB->pSegmentList      = dc390_sg_build_single(&pSRB->Segmentx, pcmd->sense_buffer, sizeof(pcmd->sense_buffer));
            pSRB->SGcount           = pci_map_sg(pdev, pSRB->pSegmentList, 1,
                                         DMA_FROM_DEVICE);
            cmdp->saved_dma_handle  = sg_dma_address(pSRB->pSegmentList);

            /* TODO: error handling */
            if (pSRB->SGcount != 1)
                  error = 1;
            DEBUG1(printk("%s(): Mapped sense buffer %p at %x\n", __FUNCTION__, pcmd->sense_buffer, cmdp->saved_dma_handle));
      /* Map SG list */
      } else if (pcmd->use_sg) {
            pSRB->pSegmentList      = (struct scatterlist *) pcmd->request_buffer;
            pSRB->SGcount           = pci_map_sg(pdev, pSRB->pSegmentList, pcmd->use_sg,
                                         pcmd->sc_data_direction);
            /* TODO: error handling */
            if (!pSRB->SGcount)
                  error = 1;
            DEBUG1(printk("%s(): Mapped SG %p with %d (%d) elements\n",\
                        __FUNCTION__, pcmd->request_buffer, pSRB->SGcount, pcmd->use_sg));
      /* Map single segment */
      } else if (pcmd->request_buffer && pcmd->request_bufflen) {
            pSRB->pSegmentList      = dc390_sg_build_single(&pSRB->Segmentx, pcmd->request_buffer, pcmd->request_bufflen);
            pSRB->SGcount           = pci_map_sg(pdev, pSRB->pSegmentList, 1,
                                         pcmd->sc_data_direction);
            cmdp->saved_dma_handle  = sg_dma_address(pSRB->pSegmentList);

            /* TODO: error handling */
            if (pSRB->SGcount != 1)
                  error = 1;
            DEBUG1(printk("%s(): Mapped request buffer %p at %x\n", __FUNCTION__, pcmd->request_buffer, cmdp->saved_dma_handle));
      /* No mapping !? */     
      } else
            pSRB->SGcount = 0;

      return error;
}

/* Remove pci mapping */
static void dc390_pci_unmap (struct dc390_srb* pSRB)
{
      struct scsi_cmnd *pcmd = pSRB->pcmd;
      struct pci_dev *pdev = pSRB->pSRBDCB->pDCBACB->pdev;
      DEBUG1(dc390_cmd_scp_t* cmdp = ((dc390_cmd_scp_t*)(&pcmd->SCp)));

      if (pSRB->SRBFlag) {
            pci_unmap_sg(pdev, &pSRB->Segmentx, 1, DMA_FROM_DEVICE);
            DEBUG1(printk("%s(): Unmapped sense buffer at %x\n", __FUNCTION__, cmdp->saved_dma_handle));
      } else if (pcmd->use_sg) {
            pci_unmap_sg(pdev, pcmd->request_buffer, pcmd->use_sg, pcmd->sc_data_direction);
            DEBUG1(printk("%s(): Unmapped SG at %p with %d elements\n", __FUNCTION__, pcmd->request_buffer, pcmd->use_sg));
      } else if (pcmd->request_buffer && pcmd->request_bufflen) {
            pci_unmap_sg(pdev, &pSRB->Segmentx, 1, pcmd->sc_data_direction);
            DEBUG1(printk("%s(): Unmapped request buffer at %x\n", __FUNCTION__, cmdp->saved_dma_handle));
      }
}

static void __inline__
dc390_freetag (struct dc390_dcb* pDCB, struct dc390_srb* pSRB)
{
      if (pSRB->TagNumber != SCSI_NO_TAG) {
            pDCB->TagMask &= ~(1 << pSRB->TagNumber);   /* free tag mask */
            pSRB->TagNumber = SCSI_NO_TAG;
      }
}


static int
dc390_StartSCSI( struct dc390_acb* pACB, struct dc390_dcb* pDCB, struct dc390_srb* pSRB )
{
    struct scsi_cmnd *scmd = pSRB->pcmd;
    struct scsi_device *sdev = scmd->device;
    u8 cmd, disc_allowed, try_sync_nego;
    char tag[2];

    pSRB->ScsiPhase = SCSI_NOP0;

    if (pACB->Connected)
    {
      // Should not happen normally
      printk (KERN_WARNING "DC390: Can't select when connected! (%08x,%02x)\n",
            pSRB->SRBState, pSRB->SRBFlag);
      pSRB->SRBState = SRB_READY;
      pACB->SelConn++;
      return 1;
    }
    if (time_before (jiffies, pACB->pScsiHost->last_reset))
    {
      DEBUG0(printk ("DC390: We were just reset and don't accept commands yet!\n"));
      return 1;
    }
    /* KG: Moved pci mapping here */
    dc390_pci_map(pSRB);
    /* TODO: error handling */
    DC390_write8 (Scsi_Dest_ID, pDCB->TargetID);
    DC390_write8 (Sync_Period, pDCB->SyncPeriod);
    DC390_write8 (Sync_Offset, pDCB->SyncOffset);
    DC390_write8 (CtrlReg1, pDCB->CtrlR1);
    DC390_write8 (CtrlReg3, pDCB->CtrlR3);
    DC390_write8 (CtrlReg4, pDCB->CtrlR4);
    DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);           /* Flush FIFO */
    DEBUG1(printk (KERN_INFO "DC390: Start SCSI command: %02x (Sync:%02x)\n",\
            scmd->cmnd[0], pDCB->SyncMode));

    /* Don't disconnect on AUTO_REQSENSE, cause it might be an
     * Contingent Allegiance Condition (6.6), where no tags should be used.
     * All other have to be allowed to disconnect to prevent Incorrect 
     * Initiator Connection (6.8.2/6.5.2) */
    /* Changed KG, 99/06/06 */
    if (! (pSRB->SRBFlag & AUTO_REQSENSE))
      disc_allowed = pDCB->DevMode & EN_DISCONNECT_;
    else
      disc_allowed = 0;

    if ((pDCB->SyncMode & SYNC_ENABLE) && pDCB->TargetLUN == 0 && sdev->sdtr &&
      (((scmd->cmnd[0] == REQUEST_SENSE || (pSRB->SRBFlag & AUTO_REQSENSE)) &&
        !(pDCB->SyncMode & SYNC_NEGO_DONE)) || scmd->cmnd[0] == INQUIRY))
      try_sync_nego = 1;
    else
      try_sync_nego = 0;

    pSRB->MsgCnt = 0;
    cmd = SEL_W_ATN;
    DC390_write8 (ScsiFifo, IDENTIFY(disc_allowed, pDCB->TargetLUN));
    /* Change 99/05/31: Don't use tags when not disconnecting (BUSY) */
    if ((pDCB->SyncMode & EN_TAG_QUEUEING) && disc_allowed && scsi_populate_tag_msg(scmd, tag)) {
      DC390_write8(ScsiFifo, tag[0]);
      pDCB->TagMask |= 1 << tag[1];
      pSRB->TagNumber = tag[1];
      DC390_write8(ScsiFifo, tag[1]);
      DEBUG1(printk(KERN_INFO "DC390: Select w/DisCn for Cmd %li (SRB %p), block tag %02x\n", scmd->pid, pSRB, tag[1]));
      cmd = SEL_W_ATN3;
    } else {
      /* No TagQ */
//no_tag:
      DEBUG1(printk(KERN_INFO "DC390: Select w%s/DisCn for Cmd %li (SRB %p), No TagQ\n", disc_allowed ? "" : "o", scmd->pid, pSRB));
    }

    pSRB->SRBState = SRB_START_;

    if (try_sync_nego)
      { 
      u8 Sync_Off = pDCB->SyncOffset;
        DEBUG0(printk (KERN_INFO "DC390: NEW Sync Nego code triggered (%i %i)\n", pDCB->TargetID, pDCB->TargetLUN));
      pSRB->MsgOutBuf[0] = EXTENDED_MESSAGE;
      pSRB->MsgOutBuf[1] = 3;
      pSRB->MsgOutBuf[2] = EXTENDED_SDTR;
      pSRB->MsgOutBuf[3] = pDCB->NegoPeriod;
      if (!(Sync_Off & 0x0f)) Sync_Off = SYNC_NEGO_OFFSET;
      pSRB->MsgOutBuf[4] = Sync_Off;
      pSRB->MsgCnt = 5;
      //pSRB->SRBState = SRB_MSGOUT_;
      pSRB->SRBState |= DO_SYNC_NEGO;
      cmd = SEL_W_ATN_STOP;
      }

    /* Command is written in CommandPhase, if SEL_W_ATN_STOP ... */
    if (cmd != SEL_W_ATN_STOP)
      {
      if( pSRB->SRBFlag & AUTO_REQSENSE )
        {
          DC390_write8 (ScsiFifo, REQUEST_SENSE);
          DC390_write8 (ScsiFifo, pDCB->TargetLUN << 5);
          DC390_write8 (ScsiFifo, 0);
          DC390_write8 (ScsiFifo, 0);
          DC390_write8 (ScsiFifo, sizeof(scmd->sense_buffer));
          DC390_write8 (ScsiFifo, 0);
          DEBUG1(printk (KERN_DEBUG "DC390: AutoReqSense !\n"));
        }
      else  /* write cmnd to bus */ 
        {
          u8 *ptr; u8 i;
          ptr = (u8 *)scmd->cmnd;
          for (i = 0; i < scmd->cmd_len; i++)
            DC390_write8 (ScsiFifo, *(ptr++));
        }
      }
    DEBUG0(if (pACB->pActiveDCB)    \
         printk (KERN_WARNING "DC390: ActiveDCB != 0\n"));
    DEBUG0(if (pDCB->pActiveSRB)    \
         printk (KERN_WARNING "DC390: ActiveSRB != 0\n"));
    //DC390_write8 (DMA_Cmd, DMA_IDLE_CMD);
    if (DC390_read8 (Scsi_Status) & INTERRUPT)
    {
      dc390_freetag (pDCB, pSRB);
      DEBUG0(printk ("DC390: Interrupt during Start SCSI (pid %li, target %02i-%02i)\n",
            scmd->pid, scmd->device->id, scmd->device->lun));
      pSRB->SRBState = SRB_READY;
      //DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
      pACB->SelLost++;
      return 1;
    }
    DC390_write8 (ScsiCmd, cmd);
    pACB->pActiveDCB = pDCB;
    pDCB->pActiveSRB = pSRB;
    pACB->Connected = 1;
    pSRB->ScsiPhase = SCSI_NOP1;
    return 0;
}

//#define DMA_INT EN_DMA_INT /*| EN_PAGE_INT*/
#define DMA_INT 0

#if DMA_INT
/* This is similar to AM53C974.c ... */
static u8 
dc390_dma_intr (struct dc390_acb* pACB)
{
  struct dc390_srb* pSRB;
  u8 dstate;
  DEBUG0(u16 pstate; struct pci_dev *pdev = pACB->pdev);
  
  DEBUG0(pci_read_config_word(pdev, PCI_STATUS, &pstate));
  DEBUG0(if (pstate & (PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY))\
      { printk(KERN_WARNING "DC390: PCI state = %04x!\n", pstate); \
        pci_write_config_word(pdev, PCI_STATUS, (PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY));});

  dstate = DC390_read8 (DMA_Status); 

  if (! pACB->pActiveDCB || ! pACB->pActiveDCB->pActiveSRB) return dstate;
  else pSRB  = pACB->pActiveDCB->pActiveSRB;
  
  if (dstate & (DMA_XFER_ABORT | DMA_XFER_ERROR | POWER_DOWN | PCI_MS_ABORT))
    {
      printk (KERN_ERR "DC390: DMA error (%02x)!\n", dstate);
      return dstate;
    }
  if (dstate & DMA_XFER_DONE)
    {
      u32 residual, xferCnt; int ctr = 6000000;
      if (! (DC390_read8 (DMA_Cmd) & READ_DIRECTION))
        {
          do
            {
            DEBUG1(printk (KERN_DEBUG "DC390: read residual bytes ... \n"));
            dstate = DC390_read8 (DMA_Status);
            residual = DC390_read8 (CtcReg_Low) | DC390_read8 (CtcReg_Mid) << 8 |
              DC390_read8 (CtcReg_High) << 16;
            residual += DC390_read8 (Current_Fifo) & 0x1f;
            } while (residual && ! (dstate & SCSI_INTERRUPT) && --ctr);
          if (!ctr) printk (KERN_CRIT "DC390: dma_intr: DMA aborted unfinished: %06x bytes remain!!\n", DC390_read32 (DMA_Wk_ByteCntr));
          /* residual =  ... */
        }
      else
          residual = 0;
      
      /* ??? */
      
      xferCnt = pSRB->SGToBeXferLen - residual;
      pSRB->SGBusAddr += xferCnt;
      pSRB->TotalXferredLen += xferCnt;
      pSRB->SGToBeXferLen = residual;
# ifdef DC390_DEBUG0
      printk (KERN_INFO "DC390: DMA: residual = %i, xfer = %i\n", 
            (unsigned int)residual, (unsigned int)xferCnt);
# endif
      
      DC390_write8 (DMA_Cmd, DMA_IDLE_CMD);
    }
  dc390_laststatus &= ~0xff000000; dc390_laststatus |= dstate << 24;
  return dstate;
}
#endif


static void __inline__
dc390_InvalidCmd(struct dc390_acb* pACB)
{
      if (pACB->pActiveDCB->pActiveSRB->SRBState & (SRB_START_ | SRB_MSGOUT))
            DC390_write8(ScsiCmd, CLEAR_FIFO_CMD);
}


static irqreturn_t __inline__
DC390_Interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
    struct dc390_acb *pACB = (struct dc390_acb*)dev_id;
    struct dc390_dcb *pDCB;
    struct dc390_srb *pSRB;
    u8  sstatus=0;
    u8  phase;
    void   (*stateV)( struct dc390_acb*, struct dc390_srb*, u8 *);
    u8  istate, istatus;
#if DMA_INT
    u8  dstatus;
#endif

    sstatus = DC390_read8 (Scsi_Status);
    if( !(sstatus & INTERRUPT) )
      return IRQ_NONE;

    DEBUG1(printk (KERN_DEBUG "sstatus=%02x,", sstatus));

#if DMA_INT
    spin_lock_irq(pACB->pScsiHost->host_lock);
    dstatus = dc390_dma_intr (pACB);
    spin_unlock_irq(pACB->pScsiHost->host_lock);

    DEBUG1(printk (KERN_DEBUG "dstatus=%02x,", dstatus));
    if (! (dstatus & SCSI_INTERRUPT))
      {
      DEBUG0(printk (KERN_WARNING "DC390 Int w/o SCSI actions (only DMA?)\n"));
      return IRQ_NONE;
      }
#else
    //DC390_write32 (DMA_ScsiBusCtrl, WRT_ERASE_DMA_STAT | EN_INT_ON_PCI_ABORT);
    //dstatus = DC390_read8 (DMA_Status);
    //DC390_write32 (DMA_ScsiBusCtrl, EN_INT_ON_PCI_ABORT);
#endif

    spin_lock_irq(pACB->pScsiHost->host_lock);

    istate = DC390_read8 (Intern_State);
    istatus = DC390_read8 (INT_Status); /* This clears Scsi_Status, Intern_State and INT_Status ! */

    DEBUG1(printk (KERN_INFO "Istatus(Res,Inv,Dis,Serv,Succ,ReS,SelA,Sel)=%02x,",istatus));
    dc390_laststatus &= ~0x00ffffff;
    dc390_laststatus |= /* dstatus<<24 | */ sstatus<<16 | istate<<8 | istatus;

    if (sstatus & ILLEGAL_OP_ERR)
    {
      printk ("DC390: Illegal Operation detected (%08x)!\n", dc390_laststatus);
      dc390_dumpinfo (pACB, pACB->pActiveDCB, pACB->pActiveDCB->pActiveSRB);
    }
      
    else if (istatus &  INVALID_CMD)
    {
      printk ("DC390: Invalid Command detected (%08x)!\n", dc390_laststatus);
      dc390_InvalidCmd( pACB );
      goto unlock;
    }

    if (istatus &  SCSI_RESET)
    {
      dc390_ScsiRstDetect( pACB );
      goto unlock;
    }

    if (istatus &  DISCONNECTED)
    {
      dc390_Disconnect( pACB );
      goto unlock;
    }

    if (istatus &  RESELECTED)
    {
      dc390_Reselect( pACB );
      goto unlock;
    }

    else if (istatus & (SELECTED | SEL_ATTENTION))
    {
      printk (KERN_ERR "DC390: Target mode not supported!\n");
      goto unlock;
    }

    if (istatus & (SUCCESSFUL_OP|SERVICE_REQUEST) )
    {
      pDCB = pACB->pActiveDCB;
      if (!pDCB)
      {
            printk (KERN_ERR "DC390: Suc. op/ Serv. req: pActiveDCB = 0!\n");
            goto unlock;
      }
      pSRB = pDCB->pActiveSRB;
      if( pDCB->DCBFlag & ABORT_DEV_ )
        dc390_EnableMsgOut_Abort (pACB, pSRB);

      phase = pSRB->ScsiPhase;
      DEBUG1(printk (KERN_INFO "DC390: [%i]%s(0) (%02x)\n", phase, dc390_p0_str[phase], sstatus));
      stateV = (void *) dc390_phase0[phase];
      ( *stateV )( pACB, pSRB, &sstatus );

      pSRB->ScsiPhase = sstatus & 7;
      phase = (u8) sstatus & 7;
      DEBUG1(printk (KERN_INFO "DC390: [%i]%s(1) (%02x)\n", phase, dc390_p1_str[phase], sstatus));
      stateV = (void *) dc390_phase1[phase];
      ( *stateV )( pACB, pSRB, &sstatus );
    }

 unlock:
    spin_unlock_irq(pACB->pScsiHost->host_lock);
    return IRQ_HANDLED;
}

static irqreturn_t do_DC390_Interrupt( int irq, void *dev_id, struct pt_regs *regs)
{
    irqreturn_t ret;
    DEBUG1(printk (KERN_INFO "DC390: Irq (%i) caught: ", irq));
    /* Locking is done in DC390_Interrupt */
    ret = DC390_Interrupt(irq, dev_id, regs);
    DEBUG1(printk (".. IRQ returned\n"));
    return ret;
}

static void
dc390_DataOut_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    u8   sstatus;
    struct scatterlist *psgl;
    u32    ResidCnt, xferCnt;
    u8   dstate = 0;

    sstatus = *psstatus;

    if( !(pSRB->SRBState & SRB_XFERPAD) )
    {
      if( sstatus & (PARITY_ERR | ILLEGAL_OP_ERR) )
          pSRB->SRBStatus |= PARITY_ERROR;

      if( sstatus & COUNT_2_ZERO )
      {
          unsigned long timeout = jiffies + HZ;

          /* Function called from the ISR with the host_lock held and interrupts disabled */
          if (pSRB->SGToBeXferLen)
            while (time_before(jiffies, timeout) && !((dstate = DC390_read8 (DMA_Status)) & DMA_XFER_DONE)) {
                spin_unlock_irq(pACB->pScsiHost->host_lock);
                udelay(50);
                spin_lock_irq(pACB->pScsiHost->host_lock);
            }
          if (!time_before(jiffies, timeout))
            printk (KERN_CRIT "DC390: Deadlock in DataOut_0: DMA aborted unfinished: %06x bytes remain!!\n",
                  DC390_read32 (DMA_Wk_ByteCntr));
          dc390_laststatus &= ~0xff000000;
          dc390_laststatus |= dstate << 24;
          pSRB->TotalXferredLen += pSRB->SGToBeXferLen;
          pSRB->SGIndex++;
          if( pSRB->SGIndex < pSRB->SGcount )
          {
            pSRB->pSegmentList++;
            psgl = pSRB->pSegmentList;

            pSRB->SGBusAddr = cpu_to_le32(pci_dma_lo32(sg_dma_address(psgl)));
            pSRB->SGToBeXferLen = cpu_to_le32(sg_dma_len(psgl));
          }
          else
            pSRB->SGToBeXferLen = 0;
      }
      else
      {
          ResidCnt  = (u32) DC390_read8 (Current_Fifo) & 0x1f;
          ResidCnt |= (u32) DC390_read8 (CtcReg_High) << 16;
          ResidCnt |= (u32) DC390_read8 (CtcReg_Mid) << 8; 
          ResidCnt += (u32) DC390_read8 (CtcReg_Low);

          xferCnt = pSRB->SGToBeXferLen - ResidCnt;
          pSRB->SGBusAddr += xferCnt;
          pSRB->TotalXferredLen += xferCnt;
          pSRB->SGToBeXferLen = ResidCnt;
      }
    }
    if ((*psstatus & 7) != SCSI_DATA_OUT)
    {
          DC390_write8 (DMA_Cmd, WRITE_DIRECTION+DMA_IDLE_CMD); /* | DMA_INT */
          DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
    }     
}

static void
dc390_DataIn_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    u8   sstatus, residual, bval;
    struct scatterlist *psgl;
    u32    ResidCnt, i;
    unsigned long   xferCnt;
    u8      *ptr;

    sstatus = *psstatus;

    if( !(pSRB->SRBState & SRB_XFERPAD) )
    {
      if( sstatus & (PARITY_ERR | ILLEGAL_OP_ERR))
          pSRB->SRBStatus |= PARITY_ERROR;

      if( sstatus & COUNT_2_ZERO )
      {
          int dstate = 0;
          unsigned long timeout = jiffies + HZ;

          /* Function called from the ISR with the host_lock held and interrupts disabled */
          if (pSRB->SGToBeXferLen)
            while (time_before(jiffies, timeout) && !((dstate = DC390_read8 (DMA_Status)) & DMA_XFER_DONE)) {
                spin_unlock_irq(pACB->pScsiHost->host_lock);
                udelay(50);
                spin_lock_irq(pACB->pScsiHost->host_lock);
            }
          if (!time_before(jiffies, timeout)) {
            printk (KERN_CRIT "DC390: Deadlock in DataIn_0: DMA aborted unfinished: %06x bytes remain!!\n",
                  DC390_read32 (DMA_Wk_ByteCntr));
            printk (KERN_CRIT "DC390: DataIn_0: DMA State: %i\n", dstate);
          }
          dc390_laststatus &= ~0xff000000;
          dc390_laststatus |= dstate << 24;
          DEBUG1(ResidCnt = ((unsigned long) DC390_read8 (CtcReg_High) << 16) \
            + ((unsigned long) DC390_read8 (CtcReg_Mid) << 8)           \
            + ((unsigned long) DC390_read8 (CtcReg_Low)));
          DEBUG1(printk (KERN_DEBUG "Count_2_Zero (ResidCnt=%i,ToBeXfer=%li),", ResidCnt, pSRB->SGToBeXferLen));

          DC390_write8 (DMA_Cmd, READ_DIRECTION+DMA_IDLE_CMD); /* | DMA_INT */

          pSRB->TotalXferredLen += pSRB->SGToBeXferLen;
          pSRB->SGIndex++;
          if( pSRB->SGIndex < pSRB->SGcount )
          {
            pSRB->pSegmentList++;
            psgl = pSRB->pSegmentList;

            pSRB->SGBusAddr = cpu_to_le32(pci_dma_lo32(sg_dma_address(psgl)));
            pSRB->SGToBeXferLen = cpu_to_le32(sg_dma_len(psgl));
          }
          else
            pSRB->SGToBeXferLen = 0;
      }
      else  /* phase changed */
      {
          residual = 0;
          bval = DC390_read8 (Current_Fifo);
          while( bval & 0x1f )
          {
            DEBUG1(printk (KERN_DEBUG "Check for residuals,"));
            if( (bval & 0x1f) == 1 )
            {
                for(i=0; i < 0x100; i++)
                {
                  bval = DC390_read8 (Current_Fifo);
                  if( !(bval & 0x1f) )
                      goto din_1;
                  else if( i == 0x0ff )
                  {
                      residual = 1;   /* ;1 residual byte */
                      goto din_1;
                  }
                }
            }
            else
                bval = DC390_read8 (Current_Fifo);
          }
din_1:
          DC390_write8 (DMA_Cmd, READ_DIRECTION+DMA_BLAST_CMD);
          for (i = 0xa000; i; i--)
          {
            bval = DC390_read8 (DMA_Status);
            if (bval & BLAST_COMPLETE)
                break;
          }
          /* It seems a DMA Blast abort isn't that bad ... */
          if (!i) printk (KERN_ERR "DC390: DMA Blast aborted unfinished!\n");
          //DC390_write8 (DMA_Cmd, READ_DIRECTION+DMA_IDLE_CMD); /* | DMA_INT */
          dc390_laststatus &= ~0xff000000; dc390_laststatus |= bval << 24;

          DEBUG1(printk (KERN_DEBUG "Blast: Read %i times DMA_Status %02x", 0xa000-i, bval));
          ResidCnt = (u32) DC390_read8 (CtcReg_High);
          ResidCnt <<= 8;
          ResidCnt |= (u32) DC390_read8 (CtcReg_Mid);
          ResidCnt <<= 8;
          ResidCnt |= (u32) DC390_read8 (CtcReg_Low);

          xferCnt = pSRB->SGToBeXferLen - ResidCnt;
          pSRB->SGBusAddr += xferCnt;
          pSRB->TotalXferredLen += xferCnt;
          pSRB->SGToBeXferLen = ResidCnt;

          if( residual )
          {
            static int feedback_requested;
            bval = DC390_read8 (ScsiFifo);          /* get one residual byte */

            if (!feedback_requested) {
                  feedback_requested = 1;
                  printk(KERN_WARNING "%s: Please, contact <linux-scsi@vger.kernel.org> "
                         "to help improve support for your system.\n", __FILE__);
            }

            ptr = (u8 *) bus_to_virt( pSRB->SGBusAddr );
            *ptr = bval;
            pSRB->SGBusAddr++; xferCnt++;
            pSRB->TotalXferredLen++;
            pSRB->SGToBeXferLen--;
          }
          DEBUG1(printk (KERN_DEBUG "Xfered: %li, Total: %li, Remaining: %li\n", xferCnt,\
                     pSRB->TotalXferredLen, pSRB->SGToBeXferLen));

      }
    }
    if ((*psstatus & 7) != SCSI_DATA_IN)
    {
          DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
          DC390_write8 (DMA_Cmd, READ_DIRECTION+DMA_IDLE_CMD); /* | DMA_INT */
    }
}

static void
dc390_Command_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
}

static void
dc390_Status_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{

    pSRB->TargetStatus = DC390_read8 (ScsiFifo);
    //udelay (1);
    pSRB->EndMessage = DC390_read8 (ScsiFifo);  /* get message */

    *psstatus = SCSI_NOP0;
    pSRB->SRBState = SRB_COMPLETED;
    DC390_write8 (ScsiCmd, MSG_ACCEPTED_CMD);
}

static void
dc390_MsgOut_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    if( pSRB->SRBState & (SRB_UNEXPECT_RESEL+SRB_ABORT_SENT) )
      *psstatus = SCSI_NOP0;
    //DC390_write8 (DMA_Cmd, DMA_IDLE_CMD);
}


static void __inline__
dc390_reprog (struct dc390_acb* pACB, struct dc390_dcb* pDCB)
{
  DC390_write8 (Sync_Period, pDCB->SyncPeriod);
  DC390_write8 (Sync_Offset, pDCB->SyncOffset);
  DC390_write8 (CtrlReg3, pDCB->CtrlR3);
  DC390_write8 (CtrlReg4, pDCB->CtrlR4);
  dc390_SetXferRate (pACB, pDCB);
}


#ifdef DC390_DEBUG0
static void
dc390_printMsg (u8 *MsgBuf, u8 len)
{
  int i;
  printk (" %02x", MsgBuf[0]);
  for (i = 1; i < len; i++)
    printk (" %02x", MsgBuf[i]);
  printk ("\n");
}
#endif

#define DC390_ENABLE_MSGOUT DC390_write8 (ScsiCmd, SET_ATN_CMD)

/* reject_msg */
static void __inline__
dc390_MsgIn_reject (struct dc390_acb* pACB, struct dc390_srb* pSRB)
{
  pSRB->MsgOutBuf[0] = MESSAGE_REJECT;
  pSRB->MsgCnt = 1;
  DC390_ENABLE_MSGOUT;
  DEBUG0 (printk (KERN_INFO "DC390: Reject message\n"));
}

/* abort command */
static void
dc390_EnableMsgOut_Abort ( struct dc390_acb* pACB, struct dc390_srb* pSRB )
{
    pSRB->MsgOutBuf[0] = ABORT; 
    pSRB->MsgCnt = 1; DC390_ENABLE_MSGOUT;
    pSRB->pSRBDCB->DCBFlag &= ~ABORT_DEV_;
}

static struct dc390_srb*
dc390_MsgIn_QTag (struct dc390_acb* pACB, struct dc390_dcb* pDCB, s8 tag)
{
  struct dc390_srb* pSRB = pDCB->pGoingSRB;

  if (pSRB)
    {
      struct scsi_cmnd *scmd = scsi_find_tag(pSRB->pcmd->device, tag);
      pSRB = (struct dc390_srb *)scmd->host_scribble;

      if (pDCB->DCBFlag & ABORT_DEV_)
      {
        pSRB->SRBState = SRB_ABORT_SENT;
        dc390_EnableMsgOut_Abort( pACB, pSRB );
      }

      if (!(pSRB->SRBState & SRB_DISCONNECT))
            goto mingx0;

      pDCB->pActiveSRB = pSRB;
      pSRB->SRBState = SRB_DATA_XFER;
    }
  else
    {
    mingx0:
      pSRB = pACB->pTmpSRB;
      pSRB->SRBState = SRB_UNEXPECT_RESEL;
      pDCB->pActiveSRB = pSRB;
      pSRB->MsgOutBuf[0] = ABORT_TAG;
      pSRB->MsgCnt = 1; DC390_ENABLE_MSGOUT;
    }
  return pSRB;
}


/* set async transfer mode */
static void 
dc390_MsgIn_set_async (struct dc390_acb* pACB, struct dc390_srb* pSRB)
{
  struct dc390_dcb* pDCB = pSRB->pSRBDCB;
  if (!(pSRB->SRBState & DO_SYNC_NEGO)) 
    printk (KERN_INFO "DC390: Target %i initiates Non-Sync?\n", pDCB->TargetID);
  pSRB->SRBState &= ~DO_SYNC_NEGO;
  pDCB->SyncMode &= ~(SYNC_ENABLE+SYNC_NEGO_DONE);
  pDCB->SyncPeriod = 0;
  pDCB->SyncOffset = 0;
  //pDCB->NegoPeriod = 50; /* 200ns <=> 5 MHz */
  pDCB->CtrlR3 = FAST_CLK;    /* fast clock / normal scsi */
  pDCB->CtrlR4 &= 0x3f;
  pDCB->CtrlR4 |= pACB->glitch_cfg; /* glitch eater */
  dc390_reprog (pACB, pDCB);
}

/* set sync transfer mode */
static void
dc390_MsgIn_set_sync (struct dc390_acb* pACB, struct dc390_srb* pSRB)
{
  u8 bval;
  u16 wval, wval1;
  struct dc390_dcb* pDCB = pSRB->pSRBDCB;
  u8 oldsyncperiod = pDCB->SyncPeriod;
  u8 oldsyncoffset = pDCB->SyncOffset;
  
  if (!(pSRB->SRBState & DO_SYNC_NEGO))
    {
      printk (KERN_INFO "DC390: Target %i initiates Sync: %ins %i ... answer ...\n", 
            pDCB->TargetID, pSRB->MsgInBuf[3]<<2, pSRB->MsgInBuf[4]);

      /* reject */
      //dc390_MsgIn_reject (pACB, pSRB);
      //return dc390_MsgIn_set_async (pACB, pSRB);

      /* Reply with corrected SDTR Message */
      if (pSRB->MsgInBuf[4] > 15)
      { 
        printk (KERN_INFO "DC390: Lower Sync Offset to 15\n");
        pSRB->MsgInBuf[4] = 15;
      }
      if (pSRB->MsgInBuf[3] < pDCB->NegoPeriod)
      {
        printk (KERN_INFO "DC390: Set sync nego period to %ins\n", pDCB->NegoPeriod << 2);
        pSRB->MsgInBuf[3] = pDCB->NegoPeriod;
      }
      memcpy (pSRB->MsgOutBuf, pSRB->MsgInBuf, 5);
      pSRB->MsgCnt = 5;
      DC390_ENABLE_MSGOUT;
    }

  pSRB->SRBState &= ~DO_SYNC_NEGO;
  pDCB->SyncMode |= SYNC_ENABLE+SYNC_NEGO_DONE;
  pDCB->SyncOffset &= 0x0f0;
  pDCB->SyncOffset |= pSRB->MsgInBuf[4];
  pDCB->NegoPeriod = pSRB->MsgInBuf[3];

  wval = (u16) pSRB->MsgInBuf[3];
  wval = wval << 2; wval -= 3; wval1 = wval / 25;     /* compute speed */
  if( (wval1 * 25) != wval) wval1++;
  bval = FAST_CLK+FAST_SCSI;  /* fast clock / fast scsi */

  pDCB->CtrlR4 &= 0x3f;       /* Glitch eater: 12ns less than normal */
  if (pACB->glitch_cfg != NS_TO_GLITCH(0))
    pDCB->CtrlR4 |= NS_TO_GLITCH(((GLITCH_TO_NS(pACB->glitch_cfg)) - 1));
  else
    pDCB->CtrlR4 |= NS_TO_GLITCH(0);
  if (wval1 < 4) pDCB->CtrlR4 |= NS_TO_GLITCH(0); /* Ultra */

  if (wval1 >= 8)
    {
      wval1--;    /* Timing computation differs by 1 from FAST_SCSI */
      bval = FAST_CLK;        /* fast clock / normal scsi */
      pDCB->CtrlR4 |= pACB->glitch_cfg;   /* glitch eater */
    }

  pDCB->CtrlR3 = bval;
  pDCB->SyncPeriod = (u8)wval1;
  
  if ((oldsyncperiod != wval1 || oldsyncoffset != pDCB->SyncOffset) && pDCB->TargetLUN == 0)
    {
      if (! (bval & FAST_SCSI)) wval1++;
      printk (KERN_INFO "DC390: Target %i: Sync transfer %i.%1i MHz, Offset %i\n", pDCB->TargetID, 
            40/wval1, ((40%wval1)*10+wval1/2)/wval1, pDCB->SyncOffset & 0x0f);
    }
  
  dc390_reprog (pACB, pDCB);
}


/* handle RESTORE_PTR */
/* I presume, this command is already mapped, so, have to remap. */
static void 
dc390_restore_ptr (struct dc390_acb* pACB, struct dc390_srb* pSRB)
{
    struct scsi_cmnd *pcmd = pSRB->pcmd;
    struct scatterlist *psgl;
    pSRB->TotalXferredLen = 0;
    pSRB->SGIndex = 0;
    if (pcmd->use_sg) {
      pSRB->pSegmentList = (struct scatterlist *)pcmd->request_buffer;
      psgl = pSRB->pSegmentList;
      //dc390_pci_sync(pSRB);

      while (pSRB->TotalXferredLen + (unsigned long) sg_dma_len(psgl) < pSRB->Saved_Ptr)
      {
          pSRB->TotalXferredLen += (unsigned long) sg_dma_len(psgl);
          pSRB->SGIndex++;
          if( pSRB->SGIndex < pSRB->SGcount )
          {
            pSRB->pSegmentList++;
            psgl = pSRB->pSegmentList;
            pSRB->SGBusAddr = cpu_to_le32(pci_dma_lo32(sg_dma_address(psgl)));
            pSRB->SGToBeXferLen = cpu_to_le32(sg_dma_len(psgl));
          }
          else
            pSRB->SGToBeXferLen = 0;
      }
      pSRB->SGToBeXferLen -= (pSRB->Saved_Ptr - pSRB->TotalXferredLen);
      pSRB->SGBusAddr += (pSRB->Saved_Ptr - pSRB->TotalXferredLen);
      printk (KERN_INFO "DC390: Pointer restored. Segment %i, Total %li, Bus %08lx\n",
            pSRB->SGIndex, pSRB->Saved_Ptr, pSRB->SGBusAddr);

    } else if(pcmd->request_buffer) {
      //dc390_pci_sync(pSRB);

      sg_dma_len(&pSRB->Segmentx) = pcmd->request_bufflen - pSRB->Saved_Ptr;
      pSRB->SGcount = 1;
      pSRB->pSegmentList = (struct scatterlist *) &pSRB->Segmentx;
    } else {
       pSRB->SGcount = 0;
       printk (KERN_INFO "DC390: RESTORE_PTR message for Transfer without Scatter-Gather ??\n");
    }

  pSRB->TotalXferredLen = pSRB->Saved_Ptr;
}


/* According to the docs, the AM53C974 reads the message and 
 * generates a Successful Operation IRQ before asserting ACK for
 * the last byte (how does it know whether it's the last ?) */
/* The old code handled it in another way, indicating, that on
 * every message byte an IRQ is generated and every byte has to
 * be manually ACKed. Hmmm ?  (KG, 98/11/28) */
/* The old implementation was correct. Sigh! */

/* Check if the message is complete */
static u8 __inline__
dc390_MsgIn_complete (u8 *msgbuf, u32 len)
{ 
  if (*msgbuf == EXTENDED_MESSAGE)
  {
      if (len < 2) return 0;
      if (len < msgbuf[1] + 2) return 0;
  }
  else if (*msgbuf >= 0x20 && *msgbuf <= 0x2f) // two byte messages
      if (len < 2) return 0;
  return 1;
}



/* read and eval received messages */
static void
dc390_MsgIn_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    struct dc390_dcb*   pDCB = pACB->pActiveDCB;

    /* Read the msg */

    pSRB->MsgInBuf[pACB->MsgLen++] = DC390_read8 (ScsiFifo);
    //pSRB->SRBState = 0;

    /* Msg complete ? */
    if (dc390_MsgIn_complete (pSRB->MsgInBuf, pACB->MsgLen))
      {
      DEBUG0 (printk (KERN_INFO "DC390: MsgIn:"); dc390_printMsg (pSRB->MsgInBuf, pACB->MsgLen));
      /* Now eval the msg */
      switch (pSRB->MsgInBuf[0]) 
        {
        case DISCONNECT: 
          pSRB->SRBState = SRB_DISCONNECT; break;
          
        case SIMPLE_QUEUE_TAG:
        case HEAD_OF_QUEUE_TAG:
        case ORDERED_QUEUE_TAG:
          pSRB = dc390_MsgIn_QTag (pACB, pDCB, pSRB->MsgInBuf[1]);
          break;
          
        case MESSAGE_REJECT: 
          DC390_write8 (ScsiCmd, RESET_ATN_CMD);
          pDCB->NegoPeriod = 50; /* 200ns <=> 5 MHz */
          if( pSRB->SRBState & DO_SYNC_NEGO)
            dc390_MsgIn_set_async (pACB, pSRB);
          break;
          
        case EXTENDED_MESSAGE:
          /* reject every extended msg but SDTR */
          if (pSRB->MsgInBuf[1] != 3 || pSRB->MsgInBuf[2] != EXTENDED_SDTR)
            dc390_MsgIn_reject (pACB, pSRB);
          else
            {
            if (pSRB->MsgInBuf[3] == 0 || pSRB->MsgInBuf[4] == 0)
              dc390_MsgIn_set_async (pACB, pSRB);
            else
              dc390_MsgIn_set_sync (pACB, pSRB);
            }
          
          // nothing has to be done
        case COMMAND_COMPLETE: break;
          
          // SAVE POINTER may be ignored as we have the struct dc390_srb* associated with the
          // scsi command. Thanks, Gerard, for pointing it out.
        case SAVE_POINTERS: 
          pSRB->Saved_Ptr = pSRB->TotalXferredLen;
          break;
          // The device might want to restart transfer with a RESTORE
        case RESTORE_POINTERS:
          DEBUG0(printk ("DC390: RESTORE POINTER message received ... try to handle\n"));
          dc390_restore_ptr (pACB, pSRB);
          break;

          // reject unknown messages
        default: dc390_MsgIn_reject (pACB, pSRB);
        }
      
      /* Clear counter and MsgIn state */
      pSRB->SRBState &= ~SRB_MSGIN;
      pACB->MsgLen = 0;
      }

    *psstatus = SCSI_NOP0;
    DC390_write8 (ScsiCmd, MSG_ACCEPTED_CMD);
    //DC390_write8 (DMA_Cmd, DMA_IDLE_CMD);
}


static void
dc390_DataIO_Comm( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 ioDir)
{
    struct scatterlist *psgl;
    unsigned long  lval;
    struct dc390_dcb*   pDCB = pACB->pActiveDCB;

    if (pSRB == pACB->pTmpSRB)
    {
      if (pDCB)
            printk(KERN_ERR "DC390: pSRB == pTmpSRB! (TagQ Error?) (%02i-%i)\n", pDCB->TargetID, pDCB->TargetLUN);
      else
            printk(KERN_ERR "DC390: pSRB == pTmpSRB! (TagQ Error?) (DCB 0!)\n");

      /* Try to recover - some broken disks react badly to tagged INQUIRY */
      if (pDCB && pACB->scan_devices && pDCB->GoingSRBCnt == 1) {
            pSRB = pDCB->pGoingSRB;
            pDCB->pActiveSRB = pSRB;
      } else {
            pSRB->pSRBDCB = pDCB;
            dc390_EnableMsgOut_Abort(pACB, pSRB);
            if (pDCB)
                  pDCB->DCBFlag |= ABORT_DEV;
            return;
      }
    }

    if( pSRB->SGIndex < pSRB->SGcount )
    {
      DC390_write8 (DMA_Cmd, DMA_IDLE_CMD | ioDir /* | DMA_INT */);
      if( !pSRB->SGToBeXferLen )
      {
          psgl = pSRB->pSegmentList;
          pSRB->SGBusAddr = cpu_to_le32(pci_dma_lo32(sg_dma_address(psgl)));
          pSRB->SGToBeXferLen = cpu_to_le32(sg_dma_len(psgl));
          DEBUG1(printk (KERN_DEBUG " DC390: Next SG segment."));
      }
      lval = pSRB->SGToBeXferLen;
      DEBUG1(printk (KERN_DEBUG " DC390: Start transfer: %li bytes (address %08lx)\n", lval, pSRB->SGBusAddr));
      DC390_write8 (CtcReg_Low, (u8) lval);
      lval >>= 8;
      DC390_write8 (CtcReg_Mid, (u8) lval);
      lval >>= 8;
      DC390_write8 (CtcReg_High, (u8) lval);

      DC390_write32 (DMA_XferCnt, pSRB->SGToBeXferLen);
      DC390_write32 (DMA_XferAddr, pSRB->SGBusAddr);

      //DC390_write8 (DMA_Cmd, DMA_IDLE_CMD | ioDir); /* | DMA_INT; */
      pSRB->SRBState = SRB_DATA_XFER;

      DC390_write8 (ScsiCmd, DMA_COMMAND+INFO_XFER_CMD);

      DC390_write8 (DMA_Cmd, DMA_START_CMD | ioDir | DMA_INT);
      //DEBUG1(DC390_write32 (DMA_ScsiBusCtrl, WRT_ERASE_DMA_STAT | EN_INT_ON_PCI_ABORT));
      //DEBUG1(printk (KERN_DEBUG "DC390: DMA_Status: %02x\n", DC390_read8 (DMA_Status)));
      //DEBUG1(DC390_write32 (DMA_ScsiBusCtrl, EN_INT_ON_PCI_ABORT));
    }
    else    /* xfer pad */
    {
      if( pSRB->SGcount )
      {
          pSRB->AdaptStatus = H_OVER_UNDER_RUN;
          pSRB->SRBStatus |= OVER_RUN;
          DEBUG0(printk (KERN_WARNING " DC390: Overrun -"));
      }
      DEBUG0(printk (KERN_WARNING " Clear transfer pad \n"));
      DC390_write8 (CtcReg_Low, 0);
      DC390_write8 (CtcReg_Mid, 0);
      DC390_write8 (CtcReg_High, 0);

      pSRB->SRBState |= SRB_XFERPAD;
      DC390_write8 (ScsiCmd, DMA_COMMAND+XFER_PAD_BYTE);
/*
      DC390_write8 (DMA_Cmd, DMA_IDLE_CMD | ioDir); // | DMA_INT;
      DC390_write8 (DMA_Cmd, DMA_START_CMD | ioDir | DMA_INT);
*/
    }
}


static void
dc390_DataOutPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    dc390_DataIO_Comm (pACB, pSRB, WRITE_DIRECTION);
}

static void
dc390_DataInPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    dc390_DataIO_Comm (pACB, pSRB, READ_DIRECTION);
}

static void
dc390_CommandPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    struct dc390_dcb*   pDCB;
    u8  i, cnt;
    u8     *ptr;

    DC390_write8 (ScsiCmd, RESET_ATN_CMD);
    DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
    if( !(pSRB->SRBFlag & AUTO_REQSENSE) )
    {
      cnt = (u8) pSRB->pcmd->cmd_len;
      ptr = (u8 *) pSRB->pcmd->cmnd;
      for(i=0; i < cnt; i++)
          DC390_write8 (ScsiFifo, *(ptr++));
    }
    else
    {
      DC390_write8 (ScsiFifo, REQUEST_SENSE);
      pDCB = pACB->pActiveDCB;
      DC390_write8 (ScsiFifo, pDCB->TargetLUN << 5);
      DC390_write8 (ScsiFifo, 0);
      DC390_write8 (ScsiFifo, 0);
      DC390_write8 (ScsiFifo, sizeof(pSRB->pcmd->sense_buffer));
      DC390_write8 (ScsiFifo, 0);
      DEBUG0(printk(KERN_DEBUG "DC390: AutoReqSense (CmndPhase)!\n"));
    }
    pSRB->SRBState = SRB_COMMAND;
    DC390_write8 (ScsiCmd, INFO_XFER_CMD);
}

static void
dc390_StatusPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
    pSRB->SRBState = SRB_STATUS;
    DC390_write8 (ScsiCmd, INITIATOR_CMD_CMPLTE);
    //DC390_write8 (DMA_Cmd, DMA_IDLE_CMD);
}

static void
dc390_MsgOutPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    u8   bval, i, cnt;
    u8     *ptr;
    struct dc390_dcb*    pDCB;

    DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
    pDCB = pACB->pActiveDCB;
    if( !(pSRB->SRBState & SRB_MSGOUT) )
    {
      cnt = pSRB->MsgCnt;
      if( cnt )
      {
          ptr = (u8 *) pSRB->MsgOutBuf;
          for(i=0; i < cnt; i++)
            DC390_write8 (ScsiFifo, *(ptr++));
          pSRB->MsgCnt = 0;
          if( (pDCB->DCBFlag & ABORT_DEV_) &&
            (pSRB->MsgOutBuf[0] == ABORT) )
            pSRB->SRBState = SRB_ABORT_SENT;
      }
      else
      {
          bval = ABORT; /* ??? MSG_NOP */
          if( (pSRB->pcmd->cmnd[0] == INQUIRY ) ||
            (pSRB->pcmd->cmnd[0] == REQUEST_SENSE) ||
            (pSRB->SRBFlag & AUTO_REQSENSE) )
          {
            if( pDCB->SyncMode & SYNC_ENABLE )
                goto  mop1;
          }
          DC390_write8 (ScsiFifo, bval);
      }
      DC390_write8 (ScsiCmd, INFO_XFER_CMD);
    }
    else
    {
mop1:
        printk (KERN_ERR "DC390: OLD Sync Nego code triggered! (%i %i)\n", pDCB->TargetID, pDCB->TargetLUN);
      DC390_write8 (ScsiFifo, EXTENDED_MESSAGE);
      DC390_write8 (ScsiFifo, 3);   /*    ;length of extended msg */
      DC390_write8 (ScsiFifo, EXTENDED_SDTR);   /*    ; sync nego */
      DC390_write8 (ScsiFifo, pDCB->NegoPeriod);
      if (pDCB->SyncOffset & 0x0f)
                DC390_write8 (ScsiFifo, pDCB->SyncOffset);
      else
                DC390_write8 (ScsiFifo, SYNC_NEGO_OFFSET);            
      pSRB->SRBState |= DO_SYNC_NEGO;
      DC390_write8 (ScsiCmd, INFO_XFER_CMD);
    }
}

static void
dc390_MsgInPhase( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
    if( !(pSRB->SRBState & SRB_MSGIN) )
    {
      pSRB->SRBState &= ~SRB_DISCONNECT;
      pSRB->SRBState |= SRB_MSGIN;
    }
    DC390_write8 (ScsiCmd, INFO_XFER_CMD);
    //DC390_write8 (DMA_Cmd, DMA_IDLE_CMD);
}

static void
dc390_Nop_0( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
}

static void
dc390_Nop_1( struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
}


static void
dc390_SetXferRate( struct dc390_acb* pACB, struct dc390_dcb* pDCB )
{
    u8  bval, i, cnt;
    struct dc390_dcb*   ptr;

    if( !(pDCB->TargetLUN) )
    {
      if( !pACB->scan_devices )
      {
          ptr = pACB->pLinkDCB;
          cnt = pACB->DCBCnt;
          bval = pDCB->TargetID;
          for(i=0; i<cnt; i++)
          {
            if( ptr->TargetID == bval )
            {
                ptr->SyncPeriod = pDCB->SyncPeriod;
                ptr->SyncOffset = pDCB->SyncOffset;
                ptr->CtrlR3 = pDCB->CtrlR3;
                ptr->CtrlR4 = pDCB->CtrlR4;
                ptr->SyncMode = pDCB->SyncMode;
            }
            ptr = ptr->pNextDCB;
          }
      }
    }
    return;
}


static void
dc390_Disconnect( struct dc390_acb* pACB )
{
    struct dc390_dcb *pDCB;
    struct dc390_srb *pSRB, *psrb;
    u8  i, cnt;

    DEBUG0(printk(KERN_INFO "DISC,"));

    if (!pACB->Connected) printk(KERN_ERR "DC390: Disconnect not-connected bus?\n");
    pACB->Connected = 0;
    pDCB = pACB->pActiveDCB;
    if (!pDCB)
     {
      DEBUG0(printk(KERN_ERR "ACB:%p->ActiveDCB:%p IOPort:%04x IRQ:%02x !\n",\
             pACB, pDCB, pACB->IOPortBase, pACB->IRQLevel));
      mdelay(400);
      DC390_read8 (INT_Status);     /* Reset Pending INT */
      DC390_write8 (ScsiCmd, EN_SEL_RESEL);
      return;
     }
    DC390_write8 (ScsiCmd, EN_SEL_RESEL);
    pSRB = pDCB->pActiveSRB;
    pACB->pActiveDCB = NULL;
    pSRB->ScsiPhase = SCSI_NOP0;
    if( pSRB->SRBState & SRB_UNEXPECT_RESEL )
      pSRB->SRBState = 0;
    else if( pSRB->SRBState & SRB_ABORT_SENT )
    {
      pDCB->TagMask = 0;
      pDCB->DCBFlag = 0;
      cnt = pDCB->GoingSRBCnt;
      pDCB->GoingSRBCnt = 0;
      pSRB = pDCB->pGoingSRB;
      for( i=0; i < cnt; i++)
      {
          psrb = pSRB->pNextSRB;
          dc390_Free_insert (pACB, pSRB);
          pSRB = psrb;
      }
      pDCB->pGoingSRB = NULL;
    }
    else
    {
      if( (pSRB->SRBState & (SRB_START_+SRB_MSGOUT)) ||
         !(pSRB->SRBState & (SRB_DISCONNECT+SRB_COMPLETED)) )
      {     /* Selection time out */
            pSRB->TargetStatus = SCSI_STAT_SEL_TIMEOUT;
            goto  disc1;
      }
      else if (!(pSRB->SRBState & SRB_DISCONNECT) && (pSRB->SRBState & SRB_COMPLETED))
      {
disc1:
          dc390_freetag (pDCB, pSRB);
          pDCB->pActiveSRB = NULL;
          pSRB->SRBState = SRB_FREE;
          dc390_SRBdone( pACB, pDCB, pSRB);
      }
    }
    pACB->MsgLen = 0;
}


static void
dc390_Reselect( struct dc390_acb* pACB )
{
    struct dc390_dcb*   pDCB;
    struct dc390_srb*   pSRB;
    u8  id, lun;

    DEBUG0(printk(KERN_INFO "RSEL,"));
    pACB->Connected = 1;
    pDCB = pACB->pActiveDCB;
    if( pDCB )
    { /* Arbitration lost but Reselection won */
      DEBUG0(printk ("DC390: (ActiveDCB != 0: Arb. lost but resel. won)!\n"));
      pSRB = pDCB->pActiveSRB;
      if( !( pACB->scan_devices ) )
      {
          struct scsi_cmnd *pcmd = pSRB->pcmd;
          pcmd->resid = pcmd->request_bufflen;
          SET_RES_DID(pcmd->result, DID_SOFT_ERROR);
          dc390_Going_remove(pDCB, pSRB);
          dc390_Free_insert(pACB, pSRB);
          pcmd->scsi_done (pcmd);
          DEBUG0(printk(KERN_DEBUG"DC390: Return SRB %p to free\n", pSRB));
      }
    }
    /* Get ID */
    lun = DC390_read8 (ScsiFifo);
    DEBUG0(printk ("Dev %02x,", lun));
    if (!(lun & (1 << pACB->pScsiHost->this_id)))
      printk (KERN_ERR "DC390: Reselection must select host adapter: %02x!\n", lun);
    else
      lun ^= 1 << pACB->pScsiHost->this_id; /* Mask AdapterID */
    id = 0; while (lun >>= 1) id++;
    /* Get LUN */
    lun = DC390_read8 (ScsiFifo);
    if (!(lun & IDENTIFY_BASE)) printk (KERN_ERR "DC390: Resel: Expect identify message!\n");
    lun &= 7;
    DEBUG0(printk ("(%02i-%i),", id, lun));
    pDCB = dc390_findDCB (pACB, id, lun);
    if (!pDCB)
    {
      printk (KERN_ERR "DC390: Reselect from non existing device (%02i-%i)\n",
                id, lun);
      return;
    }
    pACB->pActiveDCB = pDCB;
    /* TagQ: We expect a message soon, so never mind the exact SRB */
    if( pDCB->SyncMode & EN_TAG_QUEUEING )
    {
      pSRB = pACB->pTmpSRB;
      pDCB->pActiveSRB = pSRB;
    }
    else
    {
      pSRB = pDCB->pActiveSRB;
      if( !pSRB || !(pSRB->SRBState & SRB_DISCONNECT) )
      {
          pSRB= pACB->pTmpSRB;
          pSRB->SRBState = SRB_UNEXPECT_RESEL;
          printk (KERN_ERR "DC390: Reselect without outstanding cmnd (%02i-%i)\n",
                id, lun);
          pDCB->pActiveSRB = pSRB;
          dc390_EnableMsgOut_Abort ( pACB, pSRB );
      }
      else
      {
          if( pDCB->DCBFlag & ABORT_DEV_ )
          {
            pSRB->SRBState = SRB_ABORT_SENT;
            printk (KERN_INFO "DC390: Reselect: Abort (%02i-%i)\n",
                  id, lun);
            dc390_EnableMsgOut_Abort( pACB, pSRB );
          }
          else
            pSRB->SRBState = SRB_DATA_XFER;
      }
    }

    DEBUG1(printk (KERN_DEBUG "Resel SRB(%p): TagNum (%02x)\n", pSRB, pSRB->TagNumber));
    pSRB->ScsiPhase = SCSI_NOP0;
    DC390_write8 (Scsi_Dest_ID, pDCB->TargetID);
    DC390_write8 (Sync_Period, pDCB->SyncPeriod);
    DC390_write8 (Sync_Offset, pDCB->SyncOffset);
    DC390_write8 (CtrlReg1, pDCB->CtrlR1);
    DC390_write8 (CtrlReg3, pDCB->CtrlR3);
    DC390_write8 (CtrlReg4, pDCB->CtrlR4);      /* ; Glitch eater */
    DC390_write8 (ScsiCmd, MSG_ACCEPTED_CMD);   /* ;to release the /ACK signal */
}

static int __inline__
dc390_RequestSense(struct dc390_acb* pACB, struct dc390_dcb* pDCB, struct dc390_srb* pSRB)
{
      struct scsi_cmnd *pcmd;

      pcmd = pSRB->pcmd;

      REMOVABLEDEBUG(printk(KERN_INFO "DC390: RequestSense(Cmd %02x, Id %02x, LUN %02x)\n",\
                        pcmd->cmnd[0], pDCB->TargetID, pDCB->TargetLUN));

      pSRB->SRBFlag |= AUTO_REQSENSE;
      pSRB->SavedSGCount = pcmd->use_sg;
      pSRB->SavedTotXLen = pSRB->TotalXferredLen;
      pSRB->AdaptStatus = 0;
      pSRB->TargetStatus = 0; /* CHECK_CONDITION<<1; */

      /* We are called from SRBdone, original PCI mapping has been removed
       * already, new one is set up from StartSCSI */
      pSRB->SGIndex = 0;

      pSRB->TotalXferredLen = 0;
      pSRB->SGToBeXferLen = 0;
      return dc390_StartSCSI(pACB, pDCB, pSRB);
}


static void
dc390_SRBdone( struct dc390_acb* pACB, struct dc390_dcb* pDCB, struct dc390_srb* pSRB )
{
    u8 status;
    struct scsi_cmnd *pcmd;

    pcmd = pSRB->pcmd;
    /* KG: Moved pci_unmap here */
    dc390_pci_unmap(pSRB);

    status = pSRB->TargetStatus;

    DEBUG0(printk (" SRBdone (%02x,%08x), SRB %p, pid %li\n", status, pcmd->result,\
            pSRB, pcmd->pid));
    if(pSRB->SRBFlag & AUTO_REQSENSE)
    { /* Last command was a Request Sense */
      pSRB->SRBFlag &= ~AUTO_REQSENSE;
      pSRB->AdaptStatus = 0;
      pSRB->TargetStatus = CHECK_CONDITION << 1;

      //pcmd->result = MK_RES(DRIVER_SENSE,DID_OK,0,status);
      if (status == (CHECK_CONDITION << 1))
          pcmd->result = MK_RES_LNX(0, DID_BAD_TARGET, 0, /*CHECK_CONDITION*/0);
      else /* Retry */
      {
          if( pSRB->pcmd->cmnd[0] == TEST_UNIT_READY /* || pSRB->pcmd->cmnd[0] == START_STOP */)
          {
            /* Don't retry on TEST_UNIT_READY */
            pcmd->result = MK_RES_LNX(DRIVER_SENSE,DID_OK,0,CHECK_CONDITION);
            REMOVABLEDEBUG(printk(KERN_INFO "Cmd=%02x, Result=%08x, XferL=%08x\n",pSRB->pcmd->cmnd[0],\
                   (u32) pcmd->result, (u32) pSRB->TotalXferredLen));
          } else {
            SET_RES_DRV(pcmd->result, DRIVER_SENSE);
            pcmd->use_sg = pSRB->SavedSGCount;
            //pSRB->ScsiCmdLen       = (u8) (pSRB->Segment1[0] >> 8);
            DEBUG0 (printk ("DC390: RETRY pid %li (%02x), target %02i-%02i\n", pcmd->pid, pcmd->cmnd[0], pcmd->device->id, pcmd->device->lun));
            pSRB->TotalXferredLen = 0;
            SET_RES_DID(pcmd->result, DID_SOFT_ERROR);
          }
      }
      goto cmd_done;
    }
    if( status )
    {
      if( status_byte(status) == CHECK_CONDITION )
      {
          if (dc390_RequestSense(pACB, pDCB, pSRB)) {
            SET_RES_DID(pcmd->result, DID_ERROR);
            goto cmd_done;
          }
          return;
      }
      else if( status_byte(status) == QUEUE_FULL )
      {
          scsi_track_queue_full(pcmd->device, pDCB->GoingSRBCnt - 1);
          pcmd->use_sg = pSRB->SavedSGCount;
          DEBUG0 (printk ("DC390: RETRY pid %li (%02x), target %02i-%02i\n", pcmd->pid, pcmd->cmnd[0], pcmd->device->id, pcmd->device->lun));
          pSRB->TotalXferredLen = 0;
          SET_RES_DID(pcmd->result, DID_SOFT_ERROR);
      }
      else if(status == SCSI_STAT_SEL_TIMEOUT)
      {
          pSRB->AdaptStatus = H_SEL_TIMEOUT;
          pSRB->TargetStatus = 0;
          pcmd->result = MK_RES(0,DID_NO_CONNECT,0,0);
          /* Devices are removed below ... */
      }
      else if (status_byte(status) == BUSY && 
             (pcmd->cmnd[0] == TEST_UNIT_READY || pcmd->cmnd[0] == INQUIRY) &&
             pACB->scan_devices)
      {
          pSRB->AdaptStatus = 0;
          pSRB->TargetStatus = status;
          pcmd->result = MK_RES(0,0,pSRB->EndMessage,/*status*/0);
      }
      else
      {   /* Another error */
          pSRB->TotalXferredLen = 0;
          SET_RES_DID(pcmd->result, DID_SOFT_ERROR);
          goto cmd_done;
      }
    }
    else
    { /*  Target status == 0 */
      status = pSRB->AdaptStatus;
      if(status & H_OVER_UNDER_RUN)
      {
          pSRB->TargetStatus = 0;
          SET_RES_DID(pcmd->result,DID_OK);
          SET_RES_MSG(pcmd->result,pSRB->EndMessage);
      }
      else if( pSRB->SRBStatus & PARITY_ERROR)
      {
          //pcmd->result = MK_RES(0,DID_PARITY,pSRB->EndMessage,0);
          SET_RES_DID(pcmd->result,DID_PARITY);
          SET_RES_MSG(pcmd->result,pSRB->EndMessage);
      }
      else               /* No error */
      {
          pSRB->AdaptStatus = 0;
          pSRB->TargetStatus = 0;
          SET_RES_DID(pcmd->result,DID_OK);
      }
    }

cmd_done:
    pcmd->resid = pcmd->request_bufflen - pSRB->TotalXferredLen;

    dc390_Going_remove (pDCB, pSRB);
    /* Add to free list */
    dc390_Free_insert (pACB, pSRB);

    DEBUG0(printk (KERN_DEBUG "DC390: SRBdone: done pid %li\n", pcmd->pid));
    pcmd->scsi_done (pcmd);

    return;
}


/* Remove all SRBs from Going list and inform midlevel */
static void
dc390_DoingSRB_Done(struct dc390_acb* pACB, struct scsi_cmnd *cmd)
{
    struct dc390_dcb *pDCB, *pdcb;
    struct dc390_srb *psrb, *psrb2;
    int i;
    struct scsi_cmnd *pcmd;

    pDCB = pACB->pLinkDCB;
    pdcb = pDCB;
    if (! pdcb) return;
    do
    {
      psrb = pdcb->pGoingSRB;
      for (i = 0; i < pdcb->GoingSRBCnt; i++)
      {
          psrb2 = psrb->pNextSRB;
          pcmd = psrb->pcmd;
          dc390_Free_insert (pACB, psrb);
          psrb  = psrb2;
      }
      pdcb->GoingSRBCnt = 0;
      pdcb->pGoingSRB = NULL;
      pdcb->TagMask = 0;
      pdcb = pdcb->pNextDCB;
    } while( pdcb != pDCB );
}


static void
dc390_ResetSCSIBus( struct dc390_acb* pACB )
{
    //DC390_write8 (ScsiCmd, RST_DEVICE_CMD);
    //udelay (250);
    //DC390_write8 (ScsiCmd, NOP_CMD);

    DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
    DC390_write8 (DMA_Cmd, DMA_IDLE_CMD);
    DC390_write8 (ScsiCmd, RST_SCSI_BUS_CMD);
    pACB->Connected = 0;

    return;
}

static void
dc390_ScsiRstDetect( struct dc390_acb* pACB )
{
    printk ("DC390: Rst_Detect: laststat = %08x\n", dc390_laststatus);
    //DEBUG0(printk(KERN_INFO "RST_DETECT,"));

    DC390_write8 (DMA_Cmd, DMA_IDLE_CMD);
    /* Unlock before ? */
    /* delay half a second */
    udelay (1000);
    DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
    pACB->pScsiHost->last_reset = jiffies + 5*HZ/2
                + HZ * dc390_eepromBuf[pACB->AdapterIndex][EE_DELAY];
    pACB->Connected = 0;

    if( pACB->ACBFlag & RESET_DEV )
      pACB->ACBFlag |= RESET_DONE;
    else
    {   /* Reset was issued by sb else */
      pACB->ACBFlag |= RESET_DETECT;

      dc390_ResetDevParam( pACB );
      dc390_DoingSRB_Done( pACB, NULL);
      //dc390_RecoverSRB( pACB );
      pACB->pActiveDCB = NULL;
      pACB->ACBFlag = 0;
    }
    return;
}

static int DC390_queuecommand(struct scsi_cmnd *cmd,
            void (*done)(struct scsi_cmnd *))
{
      struct scsi_device *sdev = cmd->device;
      struct dc390_acb *acb = (struct dc390_acb *)sdev->host->hostdata;
      struct dc390_dcb *dcb = sdev->hostdata;
      struct dc390_srb *srb;

      if (sdev->queue_depth <= dcb->GoingSRBCnt)
            goto device_busy;
      if (acb->pActiveDCB)
            goto host_busy;
      if (acb->ACBFlag & (RESET_DETECT|RESET_DONE|RESET_DEV))
            goto host_busy;

      srb = acb->pFreeSRB;
      if (unlikely(srb == NULL))
            goto host_busy;

      cmd->scsi_done = done;
      cmd->result = 0;
      acb->Cmds++;

      acb->pFreeSRB = srb->pNextSRB;
      srb->pNextSRB = NULL;

      srb->pSRBDCB = dcb;
      srb->pcmd = cmd;
      cmd->host_scribble = (char *)srb;
    
      srb->SGIndex = 0;
      srb->AdaptStatus = 0;
      srb->TargetStatus = 0;
      srb->MsgCnt = 0;

      srb->SRBStatus = 0;
      srb->SRBFlag = 0;
      srb->SRBState = 0;
      srb->TotalXferredLen = 0;
      srb->SGBusAddr = 0;
      srb->SGToBeXferLen = 0;
      srb->ScsiPhase = 0;
      srb->EndMessage = 0;
      srb->TagNumber = SCSI_NO_TAG;

      if (dc390_StartSCSI(acb, dcb, srb)) {
            dc390_Free_insert(acb, srb);
            goto host_busy;
      }

      dc390_Going_append(dcb, srb);

      return 0;

 host_busy:
      return SCSI_MLQUEUE_HOST_BUSY;

 device_busy:
      return SCSI_MLQUEUE_DEVICE_BUSY;
}

static void dc390_dumpinfo (struct dc390_acb* pACB, struct dc390_dcb* pDCB, struct dc390_srb* pSRB)
{
    struct pci_dev *pdev;
    u16 pstat;

    if (!pDCB) pDCB = pACB->pActiveDCB;
    if (!pSRB && pDCB) pSRB = pDCB->pActiveSRB;

    if (pSRB) 
    {
      printk ("DC390: SRB: Xferred %08lx, Remain %08lx, State %08x, Phase %02x\n",
            pSRB->TotalXferredLen, pSRB->SGToBeXferLen, pSRB->SRBState,
            pSRB->ScsiPhase);
      printk ("DC390: AdpaterStatus: %02x, SRB Status %02x\n", pSRB->AdaptStatus, pSRB->SRBStatus);
    }
    printk ("DC390: Status of last IRQ (DMA/SC/Int/IRQ): %08x\n", dc390_laststatus);
    printk ("DC390: Register dump: SCSI block:\n");
    printk ("DC390: XferCnt  Cmd Stat IntS IRQS FFIS Ctl1 Ctl2 Ctl3 Ctl4\n");
    printk ("DC390:  %06x   %02x   %02x   %02x",
          DC390_read8(CtcReg_Low) + (DC390_read8(CtcReg_Mid) << 8) + (DC390_read8(CtcReg_High) << 16),
          DC390_read8(ScsiCmd), DC390_read8(Scsi_Status), DC390_read8(Intern_State));
    printk ("   %02x   %02x   %02x   %02x   %02x   %02x\n",
          DC390_read8(INT_Status), DC390_read8(Current_Fifo), DC390_read8(CtrlReg1),
          DC390_read8(CtrlReg2), DC390_read8(CtrlReg3), DC390_read8(CtrlReg4));
    DC390_write32 (DMA_ScsiBusCtrl, WRT_ERASE_DMA_STAT | EN_INT_ON_PCI_ABORT);
    if (DC390_read8(Current_Fifo) & 0x1f)
      {
      printk ("DC390: FIFO:");
      while (DC390_read8(Current_Fifo) & 0x1f) printk (" %02x", DC390_read8(ScsiFifo));
      printk ("\n");
      }
    printk ("DC390: Register dump: DMA engine:\n");
    printk ("DC390: Cmd   STrCnt    SBusA    WrkBC    WrkAC Stat SBusCtrl\n");
    printk ("DC390:  %02x %08x %08x %08x %08x   %02x %08x\n",
          DC390_read8(DMA_Cmd), DC390_read32(DMA_XferCnt), DC390_read32(DMA_XferAddr),
          DC390_read32(DMA_Wk_ByteCntr), DC390_read32(DMA_Wk_AddrCntr),
          DC390_read8(DMA_Status), DC390_read32(DMA_ScsiBusCtrl));
    DC390_write32 (DMA_ScsiBusCtrl, EN_INT_ON_PCI_ABORT);

    pdev = pACB->pdev;
    pci_read_config_word(pdev, PCI_STATUS, &pstat);
    printk ("DC390: Register dump: PCI Status: %04x\n", pstat);
    printk ("DC390: In case of driver trouble read Documentation/scsi/tmscsim.txt\n");
}


static int DC390_abort(struct scsi_cmnd *cmd)
{
      struct dc390_acb *pACB = (struct dc390_acb*) cmd->device->host->hostdata;
      struct dc390_dcb *pDCB = (struct dc390_dcb*) cmd->device->hostdata;

      scmd_printk(KERN_WARNING, cmd,
            "DC390: Abort command (pid %li)\n", cmd->pid);

      /* abort() is too stupid for already sent commands at the moment. 
       * If it's called we are in trouble anyway, so let's dump some info 
       * into the syslog at least. (KG, 98/08/20,99/06/20) */
      dc390_dumpinfo(pACB, pDCB, NULL);

      pDCB->DCBFlag |= ABORT_DEV_;
      printk(KERN_INFO "DC390: Aborted pid %li\n", cmd->pid);

      return FAILED;
}


static void dc390_ResetDevParam( struct dc390_acb* pACB )
{
    struct dc390_dcb *pDCB, *pdcb;

    pDCB = pACB->pLinkDCB;
    if (! pDCB) return;
    pdcb = pDCB;
    do
    {
      pDCB->SyncMode &= ~SYNC_NEGO_DONE;
      pDCB->SyncPeriod = 0;
      pDCB->SyncOffset = 0;
      pDCB->TagMask = 0;
      pDCB->CtrlR3 = FAST_CLK;
      pDCB->CtrlR4 &= NEGATE_REQACKDATA | CTRL4_RESERVED | NEGATE_REQACK;
      pDCB->CtrlR4 |= pACB->glitch_cfg;
      pDCB = pDCB->pNextDCB;
    }
    while( pdcb != pDCB );
    pACB->ACBFlag &= ~(RESET_DEV | RESET_DONE | RESET_DETECT);

}

static int DC390_bus_reset (struct scsi_cmnd *cmd)
{
      struct dc390_acb*    pACB = (struct dc390_acb*) cmd->device->host->hostdata;
      u8   bval;

      spin_lock_irq(cmd->device->host->host_lock);

      bval = DC390_read8(CtrlReg1) | DIS_INT_ON_SCSI_RST;
      DC390_write8(CtrlReg1, bval); /* disable IRQ on bus reset */

      pACB->ACBFlag |= RESET_DEV;
      dc390_ResetSCSIBus(pACB);

      dc390_ResetDevParam(pACB);
      mdelay(1);
      pACB->pScsiHost->last_reset = jiffies + 3*HZ/2 
            + HZ * dc390_eepromBuf[pACB->AdapterIndex][EE_DELAY];
    
      DC390_write8(ScsiCmd, CLEAR_FIFO_CMD);
      DC390_read8(INT_Status);            /* Reset Pending INT */

      dc390_DoingSRB_Done(pACB, cmd);

      pACB->pActiveDCB = NULL;
      pACB->ACBFlag = 0;

      bval = DC390_read8(CtrlReg1) & ~DIS_INT_ON_SCSI_RST;
      DC390_write8(CtrlReg1, bval); /* re-enable interrupt */

      spin_unlock_irq(cmd->device->host->host_lock);

      return SUCCESS;
}

/**
 * dc390_slave_alloc - Called by the scsi mid layer to tell us about a new
 * scsi device that we need to deal with.
 *
 * @scsi_device: The new scsi device that we need to handle.
 */
static int dc390_slave_alloc(struct scsi_device *scsi_device)
{
      struct dc390_acb *pACB = (struct dc390_acb*) scsi_device->host->hostdata;
      struct dc390_dcb *pDCB, *pDCB2 = NULL;
      uint id = scsi_device->id;
      uint lun = scsi_device->lun;

      pDCB = kmalloc(sizeof(struct dc390_dcb), GFP_KERNEL);
      if (!pDCB)
            return -ENOMEM;
      memset(pDCB, 0, sizeof(struct dc390_dcb));

      if (!pACB->DCBCnt++) {
            pACB->pLinkDCB = pDCB;
            pACB->pDCBRunRobin = pDCB;
      } else {
            pACB->pLastDCB->pNextDCB = pDCB;
      }
   
      pDCB->pNextDCB = pACB->pLinkDCB;
      pACB->pLastDCB = pDCB;

      pDCB->pDCBACB = pACB;
      pDCB->TargetID = id;
      pDCB->TargetLUN = lun;

      /*
       * Some values are for all LUNs: Copy them 
       * In a clean way: We would have an own structure for a SCSI-ID 
       */
      if (lun && (pDCB2 = dc390_findDCB(pACB, id, 0))) {
            pDCB->DevMode = pDCB2->DevMode;
            pDCB->SyncMode = pDCB2->SyncMode & SYNC_NEGO_DONE;
            pDCB->SyncPeriod = pDCB2->SyncPeriod;
            pDCB->SyncOffset = pDCB2->SyncOffset;
            pDCB->NegoPeriod = pDCB2->NegoPeriod;
      
            pDCB->CtrlR3 = pDCB2->CtrlR3;
            pDCB->CtrlR4 = pDCB2->CtrlR4;
      } else {
            u8 index = pACB->AdapterIndex;
            PEEprom prom = (PEEprom) &dc390_eepromBuf[index][id << 2];

            pDCB->DevMode = prom->EE_MODE1;
            pDCB->NegoPeriod =
                  (dc390_clock_period1[prom->EE_SPEED] * 25) >> 2;
            pDCB->CtrlR3 = FAST_CLK;
            pDCB->CtrlR4 = pACB->glitch_cfg | CTRL4_RESERVED;
            if (dc390_eepromBuf[index][EE_MODE2] & ACTIVE_NEGATION)
                  pDCB->CtrlR4 |= NEGATE_REQACKDATA | NEGATE_REQACK;
      }

      if (pDCB->DevMode & SYNC_NEGO_)
            pDCB->SyncMode |= SYNC_ENABLE;
      else {
            pDCB->SyncMode = 0;
            pDCB->SyncOffset &= ~0x0f;
      }

      pDCB->CtrlR1 = pACB->pScsiHost->this_id;
      if (pDCB->DevMode & PARITY_CHK_)
            pDCB->CtrlR1 |= PARITY_ERR_REPO;

      pACB->scan_devices = 1;
      scsi_device->hostdata = pDCB;
      return 0;
}

/**
 * dc390_slave_destroy - Called by the scsi mid layer to tell us about a
 * device that is going away.
 *
 * @scsi_device: The scsi device that we need to remove.
 */
static void dc390_slave_destroy(struct scsi_device *scsi_device)
{
      struct dc390_acb* pACB = (struct dc390_acb*) scsi_device->host->hostdata;
      struct dc390_dcb* pDCB = (struct dc390_dcb*) scsi_device->hostdata;
      struct dc390_dcb* pPrevDCB = pACB->pLinkDCB;

      pACB->scan_devices = 0;

      BUG_ON(pDCB->GoingSRBCnt > 1);
      
      if (pDCB == pACB->pLinkDCB) {
            if (pACB->pLastDCB == pDCB) {
                  pDCB->pNextDCB = NULL;
                  pACB->pLastDCB = NULL;
            }
            pACB->pLinkDCB = pDCB->pNextDCB;
      } else {
            while (pPrevDCB->pNextDCB != pDCB)
                  pPrevDCB = pPrevDCB->pNextDCB;
            pPrevDCB->pNextDCB = pDCB->pNextDCB;
            if (pDCB == pACB->pLastDCB)
                  pACB->pLastDCB = pPrevDCB;
      }

      if (pDCB == pACB->pActiveDCB)
            pACB->pActiveDCB = NULL;
      if (pDCB == pACB->pLinkDCB)
            pACB->pLinkDCB = pDCB->pNextDCB;
      if (pDCB == pACB->pDCBRunRobin)
            pACB->pDCBRunRobin = pDCB->pNextDCB;
      kfree(pDCB); 
      
      pACB->DCBCnt--;
}

static int dc390_slave_configure(struct scsi_device *sdev)
{
      struct dc390_acb *acb = (struct dc390_acb *)sdev->host->hostdata;
      struct dc390_dcb *dcb = (struct dc390_dcb *)sdev->hostdata;

      acb->scan_devices = 0;
      if (sdev->tagged_supported && (dcb->DevMode & TAG_QUEUEING_)) {
            dcb->SyncMode |= EN_TAG_QUEUEING;
            scsi_activate_tcq(sdev, acb->TagMaxNum);
      }

      return 0;
}

static struct scsi_host_template driver_template = {
      .module                 = THIS_MODULE,
      .proc_name        = "tmscsim", 
      .name             = DC390_BANNER " V" DC390_VERSION,
      .slave_alloc            = dc390_slave_alloc,
      .slave_configure  = dc390_slave_configure,
      .slave_destroy          = dc390_slave_destroy,
      .queuecommand           = DC390_queuecommand,
      .eh_abort_handler = DC390_abort,
      .eh_bus_reset_handler   = DC390_bus_reset,
      .can_queue        = 1,
      .this_id          = 7,
      .sg_tablesize           = SG_ALL,
      .cmd_per_lun            = 1,
      .use_clustering         = DISABLE_CLUSTERING,
};

/***********************************************************************
 * Functions for access to DC390 EEPROM
 * and some to emulate it
 *
 **********************************************************************/

static void __devinit dc390_eeprom_prepare_read(struct pci_dev *pdev, u8 cmd)
{
      u8 carryFlag = 1, j = 0x80, bval;
      int i;

      for (i = 0; i < 9; i++) {
            if (carryFlag) {
                  pci_write_config_byte(pdev, 0x80, 0x40);
                  bval = 0xc0;
            } else
                  bval = 0x80;

            udelay(160);
            pci_write_config_byte(pdev, 0x80, bval);
            udelay(160);
            pci_write_config_byte(pdev, 0x80, 0);
            udelay(160);

            carryFlag = (cmd & j) ? 1 : 0;
            j >>= 1;
      }
}

static u16 __devinit dc390_eeprom_get_data(struct pci_dev *pdev)
{
      int i;
      u16 wval = 0;
      u8 bval;

      for (i = 0; i < 16; i++) {
            wval <<= 1;

            pci_write_config_byte(pdev, 0x80, 0x80);
            udelay(160);
            pci_write_config_byte(pdev, 0x80, 0x40);
            udelay(160);
            pci_read_config_byte(pdev, 0x00, &bval);

            if (bval == 0x22)
                  wval |= 1;
      }

      return wval;
}

static void __devinit dc390_read_eeprom(struct pci_dev *pdev, u16 *ptr)
{
      u8 cmd = EEPROM_READ, i;

      for (i = 0; i < 0x40; i++) {
            pci_write_config_byte(pdev, 0xc0, 0);
            udelay(160);

            dc390_eeprom_prepare_read(pdev, cmd++);
            *ptr++ = dc390_eeprom_get_data(pdev);

            pci_write_config_byte(pdev, 0x80, 0);
            pci_write_config_byte(pdev, 0x80, 0);
            udelay(160);
      }
}

/* Override EEprom values with explicitly set values */
static void __devinit dc390_eeprom_override(u8 index)
{
      u8 *ptr = (u8 *) dc390_eepromBuf[index], id;

      /* Adapter Settings */
      if (tmscsim[0] != -2)
            ptr[EE_ADAPT_SCSI_ID] = (u8)tmscsim[0];   /* Adapter ID */
      if (tmscsim[3] != -2)
            ptr[EE_MODE2] = (u8)tmscsim[3];
      if (tmscsim[5] != -2)
            ptr[EE_DELAY] = tmscsim[5];         /* Reset delay */
      if (tmscsim[4] != -2)
            ptr[EE_TAG_CMD_NUM] = (u8)tmscsim[4];     /* Tagged Cmds */

      /* Device Settings */
      for (id = 0; id < MAX_SCSI_ID; id++) {
            if (tmscsim[2] != -2)
                  ptr[id << 2] = (u8)tmscsim[2];            /* EE_MODE1 */
            if (tmscsim[1] != -2)
                  ptr[(id << 2) + 1] = (u8)tmscsim[1];      /* EE_Speed */
      }
}

static int __devinitdata tmscsim_def[] = {
      7,
      0 /* 10MHz */,
      PARITY_CHK_ | SEND_START_ | EN_DISCONNECT_ | SYNC_NEGO_ | TAG_QUEUEING_,
      MORE2_DRV | GREATER_1G | RST_SCSI_BUS | ACTIVE_NEGATION | LUN_CHECK,
      3 /* 16 Tags per LUN */,
      1 /* s delay after Reset */,
};

/* Copy defaults over set values where missing */
static void __devinit dc390_fill_with_defaults (void)
{
      int i;

      for (i = 0; i < 6; i++) {
            if (tmscsim[i] < 0 || tmscsim[i] > 255)
                  tmscsim[i] = tmscsim_def[i];
      }

      /* Sanity checks */
      if (tmscsim[0] > 7)
            tmscsim[0] = 7;
      if (tmscsim[1] > 7)
            tmscsim[1] = 4;
      if (tmscsim[4] > 5)
            tmscsim[4] = 4;
      if (tmscsim[5] > 180)
            tmscsim[5] = 180;
}

static void __devinit dc390_check_eeprom(struct pci_dev *pdev, u8 index)
{
      u8 interpd[] = {1, 3, 5, 10, 16, 30, 60, 120};
      u8 EEbuf[128];
      u16 *ptr = (u16 *)EEbuf, wval = 0;
      int i;

      dc390_read_eeprom(pdev, ptr);
      memcpy(dc390_eepromBuf[index], EEbuf, EE_ADAPT_SCSI_ID);
      memcpy(&dc390_eepromBuf[index][EE_ADAPT_SCSI_ID], 
             &EEbuf[REAL_EE_ADAPT_SCSI_ID], EE_LEN - EE_ADAPT_SCSI_ID);

      dc390_eepromBuf[index][EE_DELAY] = interpd[dc390_eepromBuf[index][EE_DELAY]];

      for (i = 0; i < 0x40; i++, ptr++)
            wval += *ptr;

      /* no Tekram EEprom found */
      if (wval != 0x1234) {
            int speed;

            printk(KERN_INFO "DC390_init: No EEPROM found! Trying default settings ...\n");

            /*
             * XXX(hch): bogus, because we might have tekram and
             *           non-tekram hbas in a single machine.
             */
            dc390_fill_with_defaults();

            speed = dc390_clock_speed[tmscsim[1]];
            printk(KERN_INFO "DC390: Used defaults: AdaptID=%i, SpeedIdx=%i (%i.%i MHz), "
                   "DevMode=0x%02x, AdaptMode=0x%02x, TaggedCmnds=%i (%i), DelayReset=%is\n", 
                   tmscsim[0], tmscsim[1], speed / 10, speed % 10,
                   (u8)tmscsim[2], (u8)tmscsim[3], tmscsim[4], 2 << (tmscsim[4]), tmscsim[5]);
      }
}

static void __devinit dc390_init_hw(struct dc390_acb *pACB, u8 index)
{
      struct Scsi_Host *shost = pACB->pScsiHost;
      u8 dstate;

      /* Disable SCSI bus reset interrupt */
      DC390_write8(CtrlReg1, DIS_INT_ON_SCSI_RST | shost->this_id);

      if (pACB->Gmode2 & RST_SCSI_BUS) {
            dc390_ResetSCSIBus(pACB);
            udelay(1000);
            shost->last_reset = jiffies + HZ/2 +
                  HZ * dc390_eepromBuf[pACB->AdapterIndex][EE_DELAY];
      }

      pACB->ACBFlag = 0;

      /* Reset Pending INT */
      DC390_read8(INT_Status);
      
      /* 250ms selection timeout */
      DC390_write8(Scsi_TimeOut, SEL_TIMEOUT);
      
      /* Conversion factor = 0 , 40MHz clock */
      DC390_write8(Clk_Factor, CLK_FREQ_40MHZ);
      
      /* NOP cmd - clear command register */
      DC390_write8(ScsiCmd, NOP_CMD);
      
      /* Enable Feature and SCSI-2 */
      DC390_write8(CtrlReg2, EN_FEATURE+EN_SCSI2_CMD);
      
      /* Fast clock */
      DC390_write8(CtrlReg3, FAST_CLK);

      /* Negation */
      DC390_write8(CtrlReg4, pACB->glitch_cfg | /* glitch eater */
            (dc390_eepromBuf[index][EE_MODE2] & ACTIVE_NEGATION) ?
             NEGATE_REQACKDATA : 0);
      
      /* Clear Transfer Count High: ID */
      DC390_write8(CtcReg_High, 0);
      DC390_write8(DMA_Cmd, DMA_IDLE_CMD);
      DC390_write8(ScsiCmd, CLEAR_FIFO_CMD);
      DC390_write32(DMA_ScsiBusCtrl, EN_INT_ON_PCI_ABORT);

      dstate = DC390_read8(DMA_Status);
      DC390_write8(DMA_Status, dstate);
}

static int __devinit dc390_probe_one(struct pci_dev *pdev,
                            const struct pci_device_id *id)
{
      struct dc390_acb *pACB;
      struct Scsi_Host *shost;
      unsigned long io_port;
      int error = -ENODEV, i;

      if (pci_enable_device(pdev))
            goto out;

      pci_set_master(pdev);

      error = -ENOMEM;
      shost = scsi_host_alloc(&driver_template, sizeof(struct dc390_acb));
      if (!shost)
            goto out_disable_device;

      pACB = (struct dc390_acb *)shost->hostdata;
      memset(pACB, 0, sizeof(struct dc390_acb));

      dc390_check_eeprom(pdev, dc390_adapterCnt);
      dc390_eeprom_override(dc390_adapterCnt);

      io_port = pci_resource_start(pdev, 0);

      shost->this_id = dc390_eepromBuf[dc390_adapterCnt][EE_ADAPT_SCSI_ID];
      shost->io_port = io_port;
      shost->n_io_port = 0x80;
      shost->irq = pdev->irq;
      shost->base = io_port;
      shost->unique_id = io_port;
      shost->last_reset = jiffies;
      
      pACB->pScsiHost = shost;
      pACB->IOPortBase = (u16) io_port;
      pACB->IRQLevel = pdev->irq;
      
      shost->max_id = 8;

      if (shost->max_id - 1 ==
          dc390_eepromBuf[dc390_adapterCnt][EE_ADAPT_SCSI_ID])
            shost->max_id--;

      if (dc390_eepromBuf[dc390_adapterCnt][EE_MODE2] & LUN_CHECK)
            shost->max_lun = 8;
      else
            shost->max_lun = 1;

      pACB->pFreeSRB = pACB->SRB_array;
      pACB->SRBCount = MAX_SRB_CNT;
      pACB->AdapterIndex = dc390_adapterCnt;
      pACB->TagMaxNum =
            2 << dc390_eepromBuf[dc390_adapterCnt][EE_TAG_CMD_NUM];
      pACB->Gmode2 = dc390_eepromBuf[dc390_adapterCnt][EE_MODE2];

      for (i = 0; i < pACB->SRBCount-1; i++)
            pACB->SRB_array[i].pNextSRB = &pACB->SRB_array[i+1];
      pACB->SRB_array[pACB->SRBCount-1].pNextSRB = NULL;
      pACB->pTmpSRB = &pACB->TmpSRB;

      pACB->sel_timeout = SEL_TIMEOUT;
      pACB->glitch_cfg = EATER_25NS;
      pACB->pdev = pdev;

      if (!request_region(io_port, shost->n_io_port, "tmscsim")) {
            printk(KERN_ERR "DC390: register IO ports error!\n");
            goto out_host_put;
      }

      /* Reset Pending INT */
      DC390_read8_(INT_Status, io_port);

      if (request_irq(pdev->irq, do_DC390_Interrupt, IRQF_SHARED,
                        "tmscsim", pACB)) {
            printk(KERN_ERR "DC390: register IRQ error!\n");
            goto out_release_region;
      }

      dc390_init_hw(pACB, dc390_adapterCnt);
      
      dc390_adapterCnt++;

      pci_set_drvdata(pdev, shost);

      error = scsi_add_host(shost, &pdev->dev);
      if (error)
            goto out_free_irq;
      scsi_scan_host(shost);
      return 0;

 out_free_irq:
      free_irq(pdev->irq, pACB);
 out_release_region:
      release_region(io_port, shost->n_io_port);
 out_host_put:
      scsi_host_put(shost);
 out_disable_device:
      pci_disable_device(pdev);
 out:
      return error;
}

/**
 * dc390_remove_one - Called to remove a single instance of the adapter.
 *
 * @dev: The PCI device to remove.
 */
static void __devexit dc390_remove_one(struct pci_dev *dev)
{
      struct Scsi_Host *scsi_host = pci_get_drvdata(dev);
      unsigned long iflags;
      struct dc390_acb* pACB = (struct dc390_acb*) scsi_host->hostdata;
      u8 bval;

      scsi_remove_host(scsi_host);

      spin_lock_irqsave(scsi_host->host_lock, iflags);
      pACB->ACBFlag = RESET_DEV;
      bval = DC390_read8(CtrlReg1) | DIS_INT_ON_SCSI_RST;
      DC390_write8 (CtrlReg1, bval);      /* disable interrupt */
      if (pACB->Gmode2 & RST_SCSI_BUS)
            dc390_ResetSCSIBus(pACB);
      spin_unlock_irqrestore(scsi_host->host_lock, iflags);

      free_irq(scsi_host->irq, pACB);
      release_region(scsi_host->io_port, scsi_host->n_io_port);

      pci_disable_device(dev);
      scsi_host_put(scsi_host);
      pci_set_drvdata(dev, NULL);
}

static struct pci_device_id tmscsim_pci_tbl[] = {
      { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD53C974,
            PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
      { }
};
MODULE_DEVICE_TABLE(pci, tmscsim_pci_tbl);

static struct pci_driver dc390_driver = {
      .name           = "tmscsim",
      .id_table       = tmscsim_pci_tbl,
      .probe          = dc390_probe_one,
      .remove         = __devexit_p(dc390_remove_one),
};

static int __init dc390_module_init(void)
{
      if (tmscsim[0] == -1 || tmscsim[0] > 15) {
            tmscsim[0] = 7;
            tmscsim[1] = 4;
            tmscsim[2] = PARITY_CHK_ | TAG_QUEUEING_;
            tmscsim[3] = MORE2_DRV | GREATER_1G | RST_SCSI_BUS | ACTIVE_NEGATION;
            tmscsim[4] = 2;
            tmscsim[5] = 10;
            printk (KERN_INFO "DC390: Using safe settings.\n");
      }

      return pci_module_init(&dc390_driver);
}

static void __exit dc390_module_exit(void)
{
      pci_unregister_driver(&dc390_driver);
}

module_init(dc390_module_init);
module_exit(dc390_module_exit);

#ifndef MODULE
static int __init dc390_setup (char *str)
{     
      int ints[8],i, im;

      get_options(str, ARRAY_SIZE(ints), ints);
      im = ints[0];

      if (im > 6) {
            printk (KERN_NOTICE "DC390: ignore extra params!\n");
            im = 6;
      }

      for (i = 0; i < im; i++)
            tmscsim[i] = ints[i+1];
      /* dc390_checkparams (); */
      return 1;
}

__setup("tmscsim=", dc390_setup);
#endif

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