scsiiom.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,655 行 · 第 1/4 页

/***********************************************************************
 *	FILE NAME : SCSIIOM.C					       *
 *	     BY   : C.L. Huang,    [e-mail]		       *
 *	Description: Device Driver for Tekram DC-390 (T) PCI SCSI      *
 *		     Bus Master Host Adapter			       *
 ***********************************************************************/
/* $Id: scsiiom.c,v 2.55.2.17 2000/12/20 00:39:37 garloff Exp $ */
static void __inline__
dc390_freetag (struct dc390_dcb* pDCB, struct dc390_srb* pSRB)
{
	if (pSRB->TagNumber < 255) {
		pDCB->TagMask &= ~(1 << pSRB->TagNumber);   /* free tag mask */
		pSRB->TagNumber = 255;
	}
}


static u8
dc390_StartSCSI( struct dc390_acb* pACB, struct dc390_dcb* pDCB, struct dc390_srb* pSRB )
{
    u8 cmd; u8  disc_allowed, try_sync_nego;

    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",\
	    pSRB->pcmd->cmnd[0], pDCB->SyncMode));
    disc_allowed = pDCB->DevMode & EN_DISCONNECT_;
    try_sync_nego = 0;
    /* 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->pcmd->cmnd[0] == INQUIRY) || (pSRB->pcmd->cmnd[0] == REQUEST_SENSE) ||
	 * (pSRB->pcmd->cmnd[0] == TEST_UNIT_READY)) && pACB->scan_devices)
		||*/ (pSRB->SRBFlag & AUTO_REQSENSE) ) 
      disc_allowed = 0;
    if ( (pDCB->SyncMode & SYNC_ENABLE) && (pDCB->TargetLUN == 0) && (pDCB->Inquiry7 & 0x10) &&
	( ( ( (pSRB->pcmd->cmnd[0] == REQUEST_SENSE) || (pSRB->SRBFlag & AUTO_REQSENSE) )
	  && !(pDCB->SyncMode & SYNC_NEGO_DONE) ) || (pSRB->pcmd->cmnd[0] == INQUIRY) ) )
      try_sync_nego = 1;

    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)
      {
	u8 tag_no = 0;
	while ((1 << tag_no) & pDCB->TagMask) tag_no++;
	if (tag_no >= sizeof (pDCB->TagMask)*8 || tag_no >= pDCB->MaxCommand) { 
		printk (KERN_WARNING "DC390: Out of tags for Dev. %02x %02x\n", pDCB->TargetID, pDCB->TargetLUN); 
		return 1;
		//goto no_tag;
	}
	DC390_write8 (ScsiFifo, SIMPLE_QUEUE_TAG);
	pDCB->TagMask |= (1 << tag_no); pSRB->TagNumber = tag_no;
	DC390_write8 (ScsiFifo, tag_no);
	DEBUG1(printk (KERN_DEBUG "DC390: Select w/DisCn for Cmd %li (SRB %p), Using Tag %02x\n", pSRB->pcmd->pid, pSRB, tag_no));
	cmd = SEL_W_ATN3;
      }
    else	/* No TagQ */
      {
//      no_tag:
	DEBUG1(printk (KERN_DEBUG "DC390: Select w%s/DisCn for Cmd %li (SRB %p), No TagQ\n", (disc_allowed?"":"o"), pSRB->pcmd->pid, pSRB));
      }

    pSRB->SRBState = SRB_START_;

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

    /* Command is written in CommandPhase, if SEL_W_ATN_STOP ... */
    if (cmd != SEL_W_ATN_STOP)
      {
	if( pSRB->SRBFlag & AUTO_REQSENSE )
	  {
	    DC390_write8 (ScsiFifo, REQUEST_SENSE);
	    DC390_write8 (ScsiFifo, pDCB->TargetLUN << 5);
	    DC390_write8 (ScsiFifo, 0);
	    DC390_write8 (ScsiFifo, 0);
	    DC390_write8 (ScsiFifo, sizeof(pSRB->pcmd->sense_buffer));
	    DC390_write8 (ScsiFifo, 0);
	    DEBUG1(printk (KERN_DEBUG "DC390: AutoReqSense !\n"));
	  }
	else	/* write cmnd to bus */ 
	  {
	    u8 *ptr; u8 i;
	    ptr = (u8 *) pSRB->pcmd->cmnd;
	    for (i=0; i<pSRB->pcmd->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",
		pSRB->pcmd->pid, pSRB->pcmd->device->id, pSRB->pcmd->device->lun));
	pSRB->SRBState = SRB_READY;
	//DC390_write8 (ScsiCmd, CLEAR_FIFO_CMD);
	pACB->SelLost++;
	return 1;
    }
    DC390_write8 (ScsiCmd, cmd);
    pACB->pActiveDCB = pDCB; pDCB->pActiveSRB = pSRB;
    pACB->Connected = 1;
    pSRB->ScsiPhase = SCSI_NOP1;
    return 0;
}

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

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

  dstate = DC390_read8 (DMA_Status); 

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


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


static irqreturn_t __inline__
DC390_Interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
    struct dc390_acb *pACB, *pACB2;
    struct dc390_dcb *pDCB;
    struct dc390_srb *pSRB;
    u8  sstatus=0;
    u8  phase;
    void   (*stateV)( struct dc390_acb*, struct dc390_srb*, u8 *);
    u8  istate, istatus;
#if DMA_INT
    u8  dstatus;
#endif

    pACB = (struct dc390_acb*)dev_id;
    for (pACB2 = dc390_pACB_start; (pACB2 && pACB2 != pACB); pACB2 = pACB2->pNextACB);
    if (!pACB2)
    {
	printk ("DC390: IRQ called with foreign dev_id %p!\n", pACB);
	return IRQ_NONE;
    }
    
    sstatus = DC390_read8 (Scsi_Status);
    if( !(sstatus & INTERRUPT) )
	return IRQ_NONE;

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

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

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

    spin_lock_irq(pACB->pScsiHost->host_lock);

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

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

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

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

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

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

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

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

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

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

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

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

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

    sstatus = *psstatus;

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

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

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

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

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