/************************************************************************
   *	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.
  ",	\
  		      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
  ", 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
  ", 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
  ", 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!
  ", 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
  ", __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
  ",\
  			      __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
  ", __func__, cmdp->saved_dma_handle));
  	} else {
  		scsi_dma_unmap(pcmd);
  		DEBUG1(printk("%s(): Unmapped SG at %p with %d elements
  ",
  			      __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)
  ",
  		pSRB->SRBState, pSRB->SRBFlag);
  	pSRB->SRBState = SRB_READY;
  	pACB->SelConn++;
  	return 1;
      }
      if (time_before (jiffies, pACB->last_reset))
      {
  	DEBUG0(printk ("DC390: We were just reset and don't accept commands yet!
  "));
  	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)
  ",\
              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 SRB %p, block tag %02x
  ", pSRB, tag[1]));
  	cmd = SEL_W_ATN3;
      } else {
  	/* No TagQ */
  //no_tag:
  	DEBUG1(printk(KERN_INFO "DC390: Select w%s/DisCn for SRB %p, No TagQ
  ", disc_allowed ? "" : "o", 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)
  ", 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 !
  "));
  	  }
  	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
  "));
      DEBUG0(if (pDCB->pActiveSRB)	\
  	   printk (KERN_WARNING "DC390: ActiveSRB != 0
  "));
      //DC390_write8 (DMA_Cmd, DMA_IDLE_CMD);
      if (DC390_read8 (Scsi_Status) & INTERRUPT)
      {
  	dc390_freetag (pDCB, pSRB);
  	DEBUG0(printk ("DC390: Interrupt during Start SCSI (target %02i-%02i)
  ",
  		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)!
  ", dc390_laststatus);
  	dc390_dumpinfo (pACB, pACB->pActiveDCB, pACB->pActiveDCB->pActiveSRB);
      }
  	
      else if (istatus &  INVALID_CMD)
      {
  	printk ("DC390: Invalid Command detected (%08x)!
  ", 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!
  ");
  	goto unlock;
      }
  
      if (istatus & (SUCCESSFUL_OP|SERVICE_REQUEST) )
      {
  	pDCB = pACB->pActiveDCB;
  	if (!pDCB)
  	{
  		printk (KERN_ERR "DC390: Suc. op/ Serv. req: pActiveDCB = 0!
  ");
  		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)
  ", 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)
  ", 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
  "));
      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!!
  ",
  			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!!
  ",
  			DC390_read32 (DMA_Wk_ByteCntr));
  		printk (KERN_CRIT "DC390: DataIn_0: DMA State: %i
  ", 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!
  ");
  	    //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
  ", 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 ("
  ");
  }
  #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
  "));
  }
  
  /* 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?
  ", 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 ...
  ", 
  	      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
  ");
  	  pSRB->MsgInBuf[4] = 15;
  	}
        if (pSRB->MsgInBuf[3] < pDCB->NegoPeriod)
  	{
  	  printk (KERN_INFO "DC390: Set sync nego period to %ins
  ", 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
  ", 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
  ",
  		pSRB->SGIndex, pSRB->Saved_Ptr, pSRB->SGBusAddr);
  
      } else {
  	 pSRB->SGcount = 0;
  	 printk (KERN_INFO "DC390: RESTORE_PTR message for Transfer without Scatter-Gather ??
  ");
      }
  
    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
  "));
  	    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)
  ", pDCB->TargetID, pDCB->TargetLUN);
  	else
  		printk(KERN_ERR "DC390: pSRB == pTmpSRB! (TagQ Error?) (DCB 0!)
  ");
  
  	/* 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)
  ", 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
  ", 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 
  "));
  	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)!
  "));
      }
      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)
  ", 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?
  ");
      pACB->Connected = 0;
      pDCB = pACB->pActiveDCB;
      if (!pDCB)
       {
  	DEBUG0(printk(KERN_ERR "ACB:%p->ActiveDCB:%p IOPort:%04x IRQ:%02x !
  ",\
  	       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)!
  "));
  	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
  ", 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!
  ", 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!
  ");
      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)
  ",
  		    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)
  ",
  		    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)
  ",
  			id, lun);
  		dc390_EnableMsgOut_Abort( pACB, pSRB );
  	    }
  	    else
  		pSRB->SRBState = SRB_DATA_XFER;
  	}
      }
  
      DEBUG1(printk (KERN_DEBUG "Resel SRB(%p): TagNum (%02x)
  ", 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)
  ",\
  			      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
  ", status, pcmd->result, pSRB));
      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
  ",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 (%02x), target %02i-%02i
  ", 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 (%02x), target %02i-%02i
  ", 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
  "));
      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
  ", 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->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
  ",
  		pSRB->TotalXferredLen, pSRB->SGToBeXferLen, pSRB->SRBState,
  		pSRB->ScsiPhase);
  	printk ("DC390: AdpaterStatus: %02x, SRB Status %02x
  ", pSRB->AdaptStatus, pSRB->SRBStatus);
      }
      printk ("DC390: Status of last IRQ (DMA/SC/Int/IRQ): %08x
  ", dc390_laststatus);
      printk ("DC390: Register dump: SCSI block:
  ");
      printk ("DC390: XferCnt  Cmd Stat IntS IRQS FFIS Ctl1 Ctl2 Ctl3 Ctl4
  ");
      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
  ",
  	    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 ("
  ");
        }
      printk ("DC390: Register dump: DMA engine:
  ");
      printk ("DC390: Cmd   STrCnt    SBusA    WrkBC    WrkAC Stat SBusCtrl
  ");
      printk ("DC390:  %02x %08x %08x %08x %08x   %02x %08x
  ",
  	    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
  ", pstat);
      printk ("DC390: In case of driver trouble read Documentation/scsi/tmscsim.txt
  ");
  }
  
  
  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
  ");
  
  	/* 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.
  ");
  
  	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->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 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 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 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 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 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 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 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 ...
  ");
  
  		/*
  		 * 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
  ", 
  		       tmscsim[0], tmscsim[1], speed / 10, speed % 10,
  		       (u8)tmscsim[2], (u8)tmscsim[3], tmscsim[4], 2 << (tmscsim[4]), tmscsim[5]);
  	}
  }
  
  static void 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);
  		pACB->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 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;
  
  	pACB->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!
  ");
  		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!
  ");
  		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 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);
  }
  
  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         = 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
  ");
  		printk(KERN_INFO "       with \"disable_clustering=1\" and report to maintainers
  ");
  	}
  
  	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.
  ");
  	}
  
  	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!
  ");
  		im = 6;
  	}
  
  	for (i = 0; i < im; i++)
  		tmscsim[i] = ints[i+1];
  	/* dc390_checkparams (); */
  	return 1;
  }
  
  __setup("tmscsim=", dc390_setup);
  #endif