53c700.c

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	 * setting of the SXFER register */
	min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
	if(min_period > NCR_700_MIN_PERIOD) {
		NCR_700_SDTR_msg[3] = min_period;
	}
	if(hostdata->chip710)
		NCR_700_SDTR_msg[4] = NCR_710_MAX_OFFSET;
}

STATIC void
NCR_700_chip_reset(struct Scsi_Host *host)
{
	struct NCR_700_Host_Parameters *hostdata = 
		(struct NCR_700_Host_Parameters *)host->hostdata[0];
	if(hostdata->chip710) {
		NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
		udelay(100);

		NCR_700_writeb(0, host, ISTAT_REG);
	} else {
		NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
		udelay(100);
		
		NCR_700_writeb(0, host, DCNTL_REG);
	}

	mdelay(1000);

	NCR_700_chip_setup(host);
}

/* The heart of the message processing engine is that the instruction
 * immediately after the INT is the normal case (and so must be CLEAR
 * ACK).  If we want to do something else, we call that routine in
 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
 * ACK) so that the routine returns correctly to resume its activity
 * */
STATIC __u32
process_extended_message(struct Scsi_Host *host, 
			 struct NCR_700_Host_Parameters *hostdata,
			 Scsi_Cmnd *SCp, __u32 dsp, __u32 dsps)
{
	__u32 resume_offset = dsp, temp = dsp + 8;
	__u8 pun = 0xff, lun = 0xff;

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

	switch(hostdata->msgin[2]) {
	case A_SDTR_MSG:
		if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
			__u8 period = hostdata->msgin[3];
			__u8 offset = hostdata->msgin[4];
			__u8 sxfer;

			if(offset != 0 && period != 0)
				sxfer = NCR_700_offset_period_to_sxfer(hostdata, offset, period);
			else 
				sxfer = 0;
			
			if(sxfer != NCR_700_get_SXFER(SCp->device)) {
				printk(KERN_INFO "scsi%d: (%d:%d) Synchronous at offset %d, period %dns\n",
				       host->host_no, pun, lun,
				       offset, period*4);
				
				NCR_700_set_SXFER(SCp->device, sxfer);
			}
			

			NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
			NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
			
			NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
				       host, SXFER_REG);

		} else {
			/* SDTR message out of the blue, reject it */
			printk(KERN_WARNING "scsi%d Unexpected SDTR msg\n",
			       host->host_no);
			hostdata->msgout[0] = A_REJECT_MSG;
			NCR_700_dma_cache_wback((unsigned long)hostdata->msgout, 1);
			script_patch_16(hostdata->script, MessageCount, 1);
			/* SendMsgOut returns, so set up the return
			 * address */
			resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
		}
		break;
	
	case A_WDTR_MSG:
		printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
		       host->host_no, pun, lun);
		hostdata->msgout[0] = A_REJECT_MSG;
		NCR_700_dma_cache_wback((unsigned long)hostdata->msgout, 1);
		script_patch_16(hostdata->script, MessageCount, 1);
		resume_offset = hostdata->pScript + Ent_SendMessageWithATN;

		break;

	default:
		printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
		       host->host_no, pun, lun,
		       NCR_700_phase[(dsps & 0xf00) >> 8]);
		print_msg(hostdata->msgin);
		printk("\n");
		/* just reject it */
		hostdata->msgout[0] = A_REJECT_MSG;
		NCR_700_dma_cache_wback((unsigned long)hostdata->msgout, 1);
		script_patch_16(hostdata->script, MessageCount, 1);
		/* SendMsgOut returns, so set up the return
		 * address */
		resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
	}
	NCR_700_writel(temp, host, TEMP_REG);
	return resume_offset;
}

STATIC __u32
process_message(struct Scsi_Host *host,	struct NCR_700_Host_Parameters *hostdata,
		Scsi_Cmnd *SCp, __u32 dsp, __u32 dsps)
{
	/* work out where to return to */
	__u32 temp = dsp + 8, resume_offset = dsp;
	__u8 pun = 0xff, lun = 0xff;

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

#ifdef NCR_700_DEBUG
	printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
	       NCR_700_phase[(dsps & 0xf00) >> 8]);
	print_msg(hostdata->msgin);
	printk("\n");
#endif

	switch(hostdata->msgin[0]) {

	case A_EXTENDED_MSG:
		resume_offset =  process_extended_message(host, hostdata, SCp,
							  dsp, dsps);
		break;

	case A_REJECT_MSG:
		if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
			/* Rejected our sync negotiation attempt */
			NCR_700_set_SXFER(SCp->device, 0);
			NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
			NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
		} else if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING)) {
			/* rejected our first simple tag message */
			printk(KERN_WARNING "scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host->host_no, pun, lun);
			NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
			hostdata->tag_negotiated &= ~(1<<SCp->target);
			SCp->device->tagged_queue = 0;
			SCp->device->tagged_supported = 0;
		} else {
			printk(KERN_WARNING "scsi%d (%d:%d) Unexpected REJECT Message %s\n",
			       host->host_no, pun, lun,
			       NCR_700_phase[(dsps & 0xf00) >> 8]);
			/* however, just ignore it */
		}
		break;

	case A_PARITY_ERROR_MSG:
		printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
		       pun, lun);
		NCR_700_internal_bus_reset(host);
		break;
	case A_SIMPLE_TAG_MSG:
		printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
		       pun, lun, hostdata->msgin[1],
		       NCR_700_phase[(dsps & 0xf00) >> 8]);
		/* just ignore it */
		break;
	default:
		printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
		       host->host_no, pun, lun,
		       NCR_700_phase[(dsps & 0xf00) >> 8]);

		print_msg(hostdata->msgin);
		printk("\n");
		/* just reject it */
		hostdata->msgout[0] = A_REJECT_MSG;
		NCR_700_dma_cache_wback((unsigned long)hostdata->msgout, 1);
		script_patch_16(hostdata->script, MessageCount, 1);
		/* SendMsgOut returns, so set up the return
		 * address */
		resume_offset = hostdata->pScript + Ent_SendMessageWithATN;

		break;
	}
	NCR_700_writel(temp, host, TEMP_REG);
	/* set us up to receive another message */
	NCR_700_dma_cache_inv((unsigned long)hostdata->msgin, MSG_ARRAY_SIZE);
	return resume_offset;
}

STATIC __u32
process_script_interrupt(__u32 dsps, __u32 dsp, Scsi_Cmnd *SCp,
			 struct Scsi_Host *host,
			 struct NCR_700_Host_Parameters *hostdata)
{
	__u32 resume_offset = 0;
	__u8 pun = 0xff, lun=0xff;

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

	if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
		DEBUG(("  COMMAND COMPLETE, status=%02x\n",
		       hostdata->status[0]));
		/* OK, if TCQ still on, we know it works */
		NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
		/* check for contingent allegiance contitions */
		if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
		   status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
			struct NCR_700_command_slot *slot =
				(struct NCR_700_command_slot *)SCp->host_scribble;
			if(SCp->cmnd[0] == REQUEST_SENSE) {
				/* OOPS: bad device, returning another
				 * contingent allegiance condition */
				printk(KERN_ERR "scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host->host_no, pun, lun);
				NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
			} else {
#ifdef NCR_DEBUG
				print_command(SCp->cmnd);
				printk("  cmd %p has status %d, requesting sense\n",
				       SCp, hostdata->status[0]);
#endif
				/* we can destroy the command here
				 * because the contingent allegiance
				 * condition will cause a retry which
				 * will re-copy the command from the
				 * saved data_cmnd.  We also unmap any
				 * data associated with the command
				 * here */
				NCR_700_unmap(hostdata, SCp, slot);

				SCp->cmnd[0] = REQUEST_SENSE;
				SCp->cmnd[1] = (SCp->lun & 0x7) << 5;
				SCp->cmnd[2] = 0;
				SCp->cmnd[3] = 0;
				SCp->cmnd[4] = sizeof(SCp->sense_buffer);
				SCp->cmnd[5] = 0;
				SCp->cmd_len = 6;
				/* Here's a quiet hack: the
				 * REQUEST_SENSE command is six bytes,
				 * so store a flag indicating that
				 * this was an internal sense request
				 * and the original status at the end
				 * of the command */
				SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
				SCp->cmnd[7] = hostdata->status[0];
				SCp->cmnd[8] = SCp->use_sg;
				SCp->use_sg = 0;
				SCp->sc_data_direction = SCSI_DATA_READ;
				pci_dma_sync_single(hostdata->pci_dev,
						    slot->pCmd,
						    SCp->cmd_len,
						    PCI_DMA_TODEVICE);
				SCp->request_bufflen = sizeof(SCp->sense_buffer);
				slot->dma_handle = pci_map_single(hostdata->pci_dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), PCI_DMA_FROMDEVICE);
				slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
				slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
				slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
				slot->SG[1].pAddr = 0;
				slot->resume_offset = hostdata->pScript;
				NCR_700_dma_cache_wback((unsigned long)slot->SG, sizeof(slot->SG[0])*2);
				NCR_700_dma_cache_inv((unsigned long)SCp->sense_buffer, sizeof(SCp->sense_buffer));
				
				/* queue the command for reissue */
				slot->state = NCR_700_SLOT_QUEUED;
				hostdata->state = NCR_700_HOST_FREE;
				hostdata->cmd = NULL;
			}
		} else {
			// Currently rely on the mid layer evaluation
			// of the tag queuing capability
			//
			//if(status_byte(hostdata->status[0]) == GOOD &&
			//   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
			//	/* Piggy back the tag queueing support
			//	 * on this command */
			//	pci_dma_sync_single(hostdata->pci_dev,
			//			    slot->dma_handle,
			//			    SCp->request_bufflen,
			//			    PCI_DMA_FROMDEVICE);
			//	if(((char *)SCp->request_buffer)[7] & 0x02) {
			//		printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun);
			//		hostdata->tag_negotiated |= (1<<SCp->target);
			//		NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
			//	} else {
			//		NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
			//		hostdata->tag_negotiated &= ~(1<<SCp->target);
			//	}
			//}
			NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
		}
	} else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
		__u8 i = (dsps & 0xf00) >> 8;

		printk(KERN_ERR "scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n",
		       host->host_no, pun, lun,
		       NCR_700_phase[i],
		       sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
		printk(KERN_ERR "         len = %d, cmd =", SCp->cmd_len);
		print_command(SCp->cmnd);

		NCR_700_internal_bus_reset(host);
	} else if((dsps & 0xfffff000) == A_FATAL) {
		int i = (dsps & 0xfff);

		printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
		       host->host_no, pun, lun, NCR_700_fatal_messages[i]);
		if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
			printk(KERN_ERR "     msg begins %02x %02x\n",
			       hostdata->msgin[0], hostdata->msgin[1]);
		}
		NCR_700_internal_bus_reset(host);
	} else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
#ifdef NCR_700_DEBUG
		__u8 i = (dsps & 0xf00) >> 8;

		printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
		       host->host_no, pun, lun,
		       i, NCR_700_phase[i]);
#endif
		save_for_reselection(hostdata, SCp, dsp);

	} else if(dsps == A_RESELECTION_IDENTIFIED) {
		__u8 lun;
		struct NCR_700_command_slot *slot;
		__u8 reselection_id = hostdata->reselection_id;

		lun = hostdata->msgin[0] & 0x1f;

		hostdata->reselection_id = 0xff;
		DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
		       host->host_no, reselection_id, lun));
		/* clear the reselection indicator */
		if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
			slot = find_ITLQ_Nexus(hostdata, reselection_id,
					       lun, hostdata->msgin[2]);
		} else {
			slot = find_ITL_Nexus(hostdata, reselection_id, lun);
		}
	retry:
		if(slot == NULL) {
			struct NCR_700_command_slot *s = find_ITL_Nexus(hostdata, reselection_id, lun);
			printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
			       host->host_no, reselection_id, lun,
			       hostdata->msgin[0], hostdata->msgin[1],
			       hostdata->msgin[2]);
			printk(KERN_ERR " OUTSTANDING TAGS:");
			while(s != NULL) {
				if(s->cmnd->target == reselection_id &&
				   s->cmnd->lun == lun) {
					printk("%d ", s->tag);
					if(s->tag == hostdata->msgin[2]) {
						printk(" ***FOUND*** \n");
						slot = s;
						goto retry;
					}
						
				}
				s = s->ITL_back;
			}
			printk("\n");
		} else {
			if(hostdata->state != NCR_700_HOST_BUSY)
				printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
				       host->host_no);
			resume_offset = slot->resume_offset;
			hostdata->cmd = slot->cmnd;

			/* re-patch for this command */
			script_patch_32_abs(hostdata->script, CommandAddress, 
					    slot->pCmd);
			script_patch_16(hostdata->script,
					CommandCount, slot->cmnd->cmd_len);
			script_patch_32_abs(hostdata->script, SGScriptStartAddress,
					    to32bit(&slot->pSG[0].ins));

			/* Note: setting SXFER only works if we're
			 * still in the MESSAGE phase, so it is vital
			 * that ACK is still asserted when we process
			 * the reselection message.  The resume offset
			 * should therefore always clear ACK */
			NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
				       host, SXFER_REG);
			NCR_700_dma_cache_inv((unsigned long)hostdata->msgin,
				      MSG_ARRAY_SIZE);