/************************************************************************
 *      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/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 <linux/slab.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;

static int disable_clustering;
module_param(disable_clustering, int, S_IRUGO);
MODULE_PARM_DESC(disable_clustering, "If you experience problems with your devices, try setting to 1");

/* 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 void inline dc390_start_segment(struct dc390_srb* pSRB)
{
        struct scatterlist *psgl = pSRB->pSegmentList;

        /* start new sg segment */
        pSRB->SGBusAddr = sg_dma_address(psgl);
        pSRB->SGToBeXferLen = sg_dma_len(psgl);
}

static unsigned long inline dc390_advance_segment(struct dc390_srb* pSRB, u32 residue)
{
        unsigned long xfer = pSRB->SGToBeXferLen - residue;

        /* xfer more bytes transferred */
        pSRB->SGBusAddr += xfer;
        pSRB->TotalXferredLen += xfer;
        pSRB->SGToBeXferLen = residue;

        return xfer;
}

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)
{
        sg_init_one(sg, addr, length);
        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, SCSI_SENSE_BUFFERSIZE);
                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", __func__, pcmd->sense_buffer, cmdp->saved_dma_handle));
        /* Map SG list */
        } else if (scsi_sg_count(pcmd)) {
                int nseg;

                nseg = scsi_dma_map(pcmd);

                pSRB->pSegmentList      = scsi_sglist(pcmd);
                pSRB->SGcount           = nseg;

                /* TODO: error handling */
                if (nseg < 0)
                        error = 1;
                DEBUG1(printk("%s(): Mapped SG %p with %d (%d) elements\n",\
                              __func__, scsi_sglist(pcmd), nseg, scsi_sg_count(pcmd)));
        /* Map single segment */
        } 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", __func__, cmdp->saved_dma_handle));
        } else {
                scsi_dma_unmap(pcmd);
                DEBUG1(printk("%s(): Unmapped SG at %p with %d elements\n",
                              __func__, scsi_sglist(pcmd), scsi_sg_count(pcmd)));
        }
}

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->serial_number, 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->serial_number, 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, SCSI_SENSE_BUFFERSIZE);
            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->serial_number, 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;
}


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(void *dev_id)
{
    struct dc390_acb *pACB = 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;

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

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

    //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);

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

static void
dc390_DataOut_0(struct dc390_acb* pACB, struct dc390_srb* pSRB, u8 *psstatus)
{
    u8   sstatus;
    u32  ResidCnt;
    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++;

                dc390_start_segment(pSRB);
            }
            else
                pSRB->SGToBeXferLen = 0;
        }
        else
        {
            ResidCnt = ((u32) DC390_read8 (Current_Fifo) & 0x1f) +
                    (((u32) DC390_read8 (CtcReg_High) << 16) |
                     ((u32) DC390_read8 (CtcReg_Mid) << 8) |
                     (u32) DC390_read8 (CtcReg_Low));

            dc390_advance_segment(pSRB, ResidCnt);
        }
    }
    if ((*psstatus & 7) != SCSI_DATA_OUT)
    {
            DC390_write8 (DMA_Cmd, WRITE_DIRECTION+DMA_IDLE_CMD);
            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;
    u32  ResidCnt, i;
    unsigned long   xferCnt;

    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=%u,ToBeXfer=%lu),", ResidCnt, pSRB->SGToBeXferLen));

            DC390_write8 (DMA_Cmd, READ_DIRECTION+DMA_IDLE_CMD);

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

                dc390_start_segment(pSRB);
            }
            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);
            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) << 16) |
                        ((u32) DC390_read8 (CtcReg_Mid) << 8)) |
                    (u32) DC390_read8 (CtcReg_Low);

            xferCnt = dc390_advance_segment(pSRB, ResidCnt);

            if (residual) {
                size_t count = 1;
                size_t offset = pSRB->SGBusAddr - sg_dma_address(pSRB->pSegmentList);
                unsigned long flags;
                u8 *ptr;

                bval = DC390_read8 (ScsiFifo);      /* get one residual byte */

                local_irq_save(flags);
                ptr = scsi_kmap_atomic_sg(pSRB->pSegmentList, pSRB->SGcount, &offset, &count);
                if (likely(ptr)) {
                        *(ptr + offset) = bval;
                        scsi_kunmap_atomic_sg(ptr);
                }
                local_irq_restore(flags);
                WARN_ON(!ptr);

                /* 1 more byte read */
                xferCnt += dc390_advance_segment(pSRB, pSRB->SGToBeXferLen - 1);
            }
            DEBUG1(printk (KERN_DEBUG "Xfered: %lu, Total: %lu, Remaining: %lu\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);
    }
}

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 */
/* This doesn't look very healthy... to-be-fixed */
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 (scsi_sg_count(pcmd)) {
        size_t saved;
        pSRB->pSegmentList = scsi_sglist(pcmd);
        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++;

                dc390_start_segment(pSRB);
            }
            else
                pSRB->SGToBeXferLen = 0;
        }

        saved = pSRB->Saved_Ptr - pSRB->TotalXferredLen;
        pSRB->SGToBeXferLen -= saved;
        pSRB->SGBusAddr += saved;
        printk (KERN_INFO "DC390: Pointer restored. Segment %i, Total %li, Bus %08lx\n",
                pSRB->SGIndex, pSRB->Saved_Ptr, pSRB->SGBusAddr);

    } 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)
{
    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);
        if( !pSRB->SGToBeXferLen )
        {
            dc390_start_segment(pSRB);

            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);
        pSRB->SRBState = SRB_DATA_XFER;

        DC390_write8 (ScsiCmd, DMA_COMMAND+INFO_XFER_CMD);

        DC390_write8 (DMA_Cmd, DMA_START_CMD | ioDir);
        //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);
        DC390_write8 (DMA_Cmd, DMA_START_CMD | ioDir);
*/
    }
}


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, SCSI_SENSE_BUFFERSIZE);
        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->AdaptStatus = H_SEL_TIMEOUT;
                pSRB->TargetStatus = 0;
                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;
            scsi_set_resid(pcmd, scsi_bufflen(pcmd));
            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->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->serial_number));
    if(pSRB->SRBFlag & AUTO_REQSENSE)
    {   /* Last command was a Request Sense */
        pSRB->SRBFlag &= ~AUTO_REQSENSE;
        pSRB->AdaptStatus = 0;
        pSRB->TargetStatus = SAM_STAT_CHECK_CONDITION;

        //pcmd->result = MK_RES(DRIVER_SENSE,DID_OK,0,status);
        if (status == SAM_STAT_CHECK_CONDITION)
            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, SAM_STAT_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);
                //pSRB->ScsiCmdLen       = (u8) (pSRB->Segment1[0] >> 8);
                DEBUG0 (printk ("DC390: RETRY pid %li (%02x), target %02i-%02i\n", pcmd->serial_number, 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 == SAM_STAT_CHECK_CONDITION)
        {
            if (dc390_RequestSense(pACB, pDCB, pSRB)) {
                SET_RES_DID(pcmd->result, DID_ERROR);
                goto cmd_done;
            }
            return;
        }
        else if (status == SAM_STAT_TASK_SET_FULL)
        {
            scsi_track_queue_full(pcmd->device, pDCB->GoingSRBCnt - 1);
            DEBUG0 (printk ("DC390: RETRY pid %li (%02x), target %02i-%02i\n", pcmd->serial_number, pcmd->cmnd[0], pcmd->device->id, pcmd->device->lun));
            pSRB->TotalXferredLen = 0;
            SET_RES_DID(pcmd->result, DID_SOFT_ERROR);
        }
        else if (status == SAM_STAT_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 (status == H_SEL_TIMEOUT)
        {
            pcmd->result = MK_RES(0, DID_NO_CONNECT, 0, 0);
            /* Devices are removed below ... */
        }
        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:
    scsi_set_resid(pcmd, scsi_bufflen(pcmd) - 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->serial_number));
    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_lck(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 DEF_SCSI_QCMD(DC390_queuecommand)

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->serial_number);

        /* 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->serial_number);

        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 = kzalloc(sizeof(struct dc390_dcb), GFP_KERNEL);
        if (!pDCB)
                return -ENOMEM;

        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         = ENABLE_CLUSTERING,
        .max_sectors            = 0x4000, /* 8MiB = 16 * 1024 * 512 */
};

/***********************************************************************
 * 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;
        if (disable_clustering)
                driver_template.use_clustering = DISABLE_CLUSTERING;
        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 (!disable_clustering) {
                printk(KERN_INFO "DC390: clustering now enabled by default. If you get problems load\n");
                printk(KERN_INFO "       with \"disable_clustering=1\" and report to maintainers\n");
        }

        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_register_driver(&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