53c700.c

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			NCR_700_dma_cache_wback((unsigned long)hostdata->msgout,
					MSG_ARRAY_SIZE);
			/* I'm just being paranoid here, the command should
			 * already have been flushed from the cache */
			NCR_700_dma_cache_wback((unsigned long)slot->cmnd->cmnd,
					slot->cmnd->cmd_len);


			
		}
	} else if(dsps == A_RESELECTED_DURING_SELECTION) {

		/* This section is full of debugging code because I've
		 * never managed to reach it.  I think what happens is
		 * that, because the 700 runs with selection
		 * interrupts enabled the whole time that we take a
		 * selection interrupt before we manage to get to the
		 * reselected script interrupt */

		__u8 reselection_id = NCR_700_readb(host, SFBR_REG);
		struct NCR_700_command_slot *slot;
		
		/* Take out our own ID */
		reselection_id &= ~(1<<host->this_id);
		
		/* I've never seen this happen, so keep this as a printk rather
		 * than a debug */
		printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
		       host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);

		{
			/* FIXME: DEBUGGING CODE */
			__u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
			int i;

			for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
				if(SG >= to32bit(&hostdata->slots[i].pSG[0])
				   && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
					break;
			}
			printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset);
			SCp =  hostdata->slots[i].cmnd;
		}

		if(SCp != NULL) {
			slot = (struct NCR_700_command_slot *)SCp->host_scribble;
			/* change slot from busy to queued to redo command */
			slot->state = NCR_700_SLOT_QUEUED;
		}
		hostdata->cmd = NULL;
		
		if(reselection_id == 0) {
			if(hostdata->reselection_id == 0xff) {
				printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
				return 0;
			} else {
				printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
				       host->host_no);
				reselection_id = hostdata->reselection_id;
			}
		} else {
			
			/* convert to real ID */
			reselection_id = bitmap_to_number(reselection_id);
		}
		hostdata->reselection_id = reselection_id;
		/* just in case we have a stale simple tag message, clear it */
		hostdata->msgin[1] = 0;
		NCR_700_dma_cache_wback_inv((unsigned long)hostdata->msgin,
					    MSG_ARRAY_SIZE);
		if(hostdata->tag_negotiated & (1<<reselection_id)) {
			resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
		} else {
			resume_offset = hostdata->pScript + Ent_GetReselectionData;
		}
	} else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
		/* we've just disconnected from the bus, do nothing since
		 * a return here will re-run the queued command slot
		 * that may have been interrupted by the initial selection */
		DEBUG((" SELECTION COMPLETED\n"));
	} else if((dsps & 0xfffff0f0) == A_MSG_IN) { 
		resume_offset = process_message(host, hostdata, SCp,
						dsp, dsps);
	} else if((dsps &  0xfffff000) == 0) {
		__u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
		printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
		       host->host_no, pun, lun, NCR_700_condition[i],
		       NCR_700_phase[j], dsp - hostdata->pScript);
		if(SCp != NULL) {
			print_command(SCp->cmnd);

			if(SCp->use_sg) {
				for(i = 0; i < SCp->use_sg + 1; i++) {
					printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
				}
			}
		}	       
		NCR_700_internal_bus_reset(host);
	} else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
		printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
		       host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
		resume_offset = dsp;
	} else {
		printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
		       host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
		NCR_700_internal_bus_reset(host);
	}
	return resume_offset;
}

/* We run the 53c700 with selection interrupts always enabled.  This
 * means that the chip may be selected as soon as the bus frees.  On a
 * busy bus, this can be before the scripts engine finishes its
 * processing.  Therefore, part of the selection processing has to be
 * to find out what the scripts engine is doing and complete the
 * function if necessary (i.e. process the pending disconnect or save
 * the interrupted initial selection */
STATIC inline __u32
process_selection(struct Scsi_Host *host, __u32 dsp)
{
	__u8 id = 0;	/* Squash compiler warning */
	int count = 0;
	__u32 resume_offset = 0;
	struct NCR_700_Host_Parameters *hostdata =
		(struct NCR_700_Host_Parameters *)host->hostdata[0];
	Scsi_Cmnd *SCp = hostdata->cmd;
	__u8 sbcl;

	for(count = 0; count < 5; count++) {
		id = NCR_700_readb(host, hostdata->chip710 ?
				   CTEST9_REG : SFBR_REG);

		/* Take out our own ID */
		id &= ~(1<<host->this_id);
		if(id != 0) 
			break;
		udelay(5);
	}
	sbcl = NCR_700_readb(host, SBCL_REG);
	if((sbcl & SBCL_IO) == 0) {
		/* mark as having been selected rather than reselected */
		id = 0xff;
	} else {
		/* convert to real ID */
		hostdata->reselection_id = id = bitmap_to_number(id);
		DEBUG(("scsi%d:  Reselected by %d\n",
		       host->host_no, id));
	}
	if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
		struct NCR_700_command_slot *slot =
			(struct NCR_700_command_slot *)SCp->host_scribble;
		DEBUG(("  ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
		
		switch(dsp - hostdata->pScript) {
		case Ent_Disconnect1:
		case Ent_Disconnect2:
			save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
			break;
		case Ent_Disconnect3:
		case Ent_Disconnect4:
			save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
			break;
		case Ent_Disconnect5:
		case Ent_Disconnect6:
			save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
			break;
		case Ent_Disconnect7:
		case Ent_Disconnect8:
			save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
			break;
		case Ent_Finish1:
		case Ent_Finish2:
			process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
			break;
			
		default:
			slot->state = NCR_700_SLOT_QUEUED;
			break;
			}
	}
	hostdata->state = NCR_700_HOST_BUSY;
	hostdata->cmd = NULL;
	/* clear any stale simple tag message */
	hostdata->msgin[1] = 0;
	NCR_700_dma_cache_wback_inv((unsigned long)hostdata->msgin, MSG_ARRAY_SIZE);

	if(id == 0xff) {
		/* Selected as target, Ignore */
		resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
	} else if(hostdata->tag_negotiated & (1<<id)) {
		resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
	} else {
		resume_offset = hostdata->pScript + Ent_GetReselectionData;
	}
	return resume_offset;
}

static inline void
NCR_700_clear_fifo(struct Scsi_Host *host) {
	const struct NCR_700_Host_Parameters *hostdata
		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
	if(hostdata->chip710) {
		NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
	} else {
		NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
	}
}

static inline void
NCR_700_flush_fifo(struct Scsi_Host *host) {
	const struct NCR_700_Host_Parameters *hostdata
		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
	if(hostdata->chip710) {
		NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
		udelay(10);
		NCR_700_writeb(0, host, CTEST8_REG);
	} else {
		NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
		udelay(10);
		NCR_700_writeb(0, host, DFIFO_REG);
	}
}


STATIC int
NCR_700_start_command(Scsi_Cmnd *SCp)
{
	struct NCR_700_command_slot *slot =
		(struct NCR_700_command_slot *)SCp->host_scribble;
	struct NCR_700_Host_Parameters *hostdata =
		(struct NCR_700_Host_Parameters *)SCp->host->hostdata[0];
	unsigned long flags;
	__u16 count = 1;	/* for IDENTIFY message */
	
	save_flags(flags);
	cli();
	if(hostdata->state != NCR_700_HOST_FREE) {
		/* keep this inside the lock to close the race window where
		 * the running command finishes on another CPU while we don't
		 * change the state to queued on this one */
		slot->state = NCR_700_SLOT_QUEUED;
		restore_flags(flags);

		DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
		       SCp->host->host_no, slot->cmnd, slot));
		return 0;
	}
	hostdata->state = NCR_700_HOST_BUSY;
	hostdata->cmd = SCp;
	slot->state = NCR_700_SLOT_BUSY;
	/* keep interrupts disabled until we have the command correctly
	 * set up so we cannot take a selection interrupt */

	hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
					       SCp->lun);
	/* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
	 * if the negotiated transfer parameters still hold, so
	 * always renegotiate them */
	if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
		NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
	}

	/* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
	 * If a contingent allegiance condition exists, the device
	 * will refuse all tags, so send the request sense as untagged
	 * */
	if((hostdata->tag_negotiated & (1<<SCp->target))
	   && (slot->tag != NCR_700_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
		hostdata->msgout[count++] = A_SIMPLE_TAG_MSG;
		hostdata->msgout[count++] = slot->tag;
	}

	if(hostdata->fast &&
	   NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
		memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg,
		       sizeof(NCR_700_SDTR_msg));
		count += sizeof(NCR_700_SDTR_msg);
		NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
	}

	script_patch_16(hostdata->script, MessageCount, count);


	script_patch_ID(hostdata->script,
			Device_ID, 1<<SCp->target);

	script_patch_32_abs(hostdata->script, CommandAddress, 
			    slot->pCmd);
	script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
	/* finally plumb the beginning of the SG list into the script
	 * */
	script_patch_32_abs(hostdata->script, SGScriptStartAddress,
			    to32bit(&slot->pSG[0].ins));
	NCR_700_clear_fifo(SCp->host);

	if(slot->resume_offset == 0)
		slot->resume_offset = hostdata->pScript;
	/* now perform all the writebacks and invalidates */
	NCR_700_dma_cache_wback((unsigned long)hostdata->msgout, count);
	NCR_700_dma_cache_inv((unsigned long)hostdata->msgin, MSG_ARRAY_SIZE);
	NCR_700_dma_cache_wback((unsigned long)SCp->cmnd, SCp->cmd_len);
	NCR_700_dma_cache_inv((unsigned long)hostdata->status, 1);

	/* set the synchronous period/offset */
	NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
		       SCp->host, SXFER_REG);
	NCR_700_writel(slot->temp, SCp->host, TEMP_REG);
	NCR_700_writel(slot->resume_offset, SCp->host, DSP_REG);

	/* allow interrupts here so that if we're selected we can take
	 * a selection interrupt.  The script start may not be
	 * effective in this case, but the selection interrupt will
	 * save our command in that case */
	restore_flags(flags);

	return 1;
}

void
NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
{
	struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
	struct NCR_700_Host_Parameters *hostdata =
		(struct NCR_700_Host_Parameters *)host->hostdata[0];
	__u8 istat;
	__u32 resume_offset = 0;
	__u8 pun = 0xff, lun = 0xff;
	unsigned long flags;

	/* Unfortunately, we have to take the io_request_lock here
	 * rather than the host lock hostdata->lock because we're
	 * looking to exclude queuecommand from messing with the
	 * registers while we're processing the interrupt.  Since
	 * queuecommand is called holding io_request_lock, and we have
	 * to take io_request_lock before we call the command
	 * scsi_done, we would get a deadlock if we took
	 * hostdata->lock here and in queuecommand (because the order
	 * of locking in queuecommand: 1) io_request_lock then 2)
	 * hostdata->lock would be the reverse of taking it in this
	 * routine */
	spin_lock_irqsave(&io_request_lock, flags);
	if((istat = NCR_700_readb(host, ISTAT_REG))
	      & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
		__u32 dsps;
		__u8 sstat0 = 0, dstat = 0;
		__u32 dsp;
		Scsi_Cmnd *SCp = hostdata->cmd;
		enum NCR_700_Host_State state;

		state = hostdata->state;
		SCp = hostdata->cmd;

		if(istat & SCSI_INT_PENDING) {
			udelay(10);

			sstat0 = NCR_700_readb(host, SSTAT0_REG);
		}

		if(istat & DMA_INT_PENDING) {
			udelay(10);

			dstat = NCR_700_readb(host, DSTAT_REG);
		}

		dsps = NCR_700_readl(host, DSPS_REG);
		dsp = NCR_700_readl(host, DSP_REG);

		DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
		       host->host_no, istat, sstat0, dstat,
		       (dsp - (__u32)(hostdata->pScript))/4,
		       dsp, dsps));

		if(SCp != NULL) {
			pun = SCp->target;
			lun = SCp->lun;
		}

		if(sstat0 & SCSI_RESET_DETECTED) {
			Scsi_Device *SDp;
			int i;

			hostdata->state = NCR_700_HOST_BUSY;

			printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
			       host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);

			/* clear all the negotiated parameters */
			for(SDp = host->host_queue; SDp != NULL; SDp = SDp->next)
				SDp->hostdata = 0;
			
			/* clear all the slots and their pending commands */
			for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
				Scsi_Cmnd *SCp;
				struct NCR_700_command_slot *slot =
					&hostdata->slots[i];

				if(slot->state == NCR_700_SLOT_FREE)